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x86: tsc prevent time going backwards
[linux-2.6/zen-sources.git] / drivers / char / synclink.c
blobddc74d1f4f1beb3922c39fa4809a428529a74615
1 /*
2 * linux/drivers/char/synclink.c
3 *
4 * $Id: synclink.c,v 4.38 2005/11/07 16:30:34 paulkf Exp $
5 *
6 * Device driver for Microgate SyncLink ISA and PCI
7 * high speed multiprotocol serial adapters.
8 *
9 * written by Paul Fulghum for Microgate Corporation
10 * paulkf@microgate.com
11 *
12 * Microgate and SyncLink are trademarks of Microgate Corporation
13 *
14 * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
15 *
16 * Original release 01/11/99
17 *
18 * This code is released under the GNU General Public License (GPL)
19 *
20 * This driver is primarily intended for use in synchronous
21 * HDLC mode. Asynchronous mode is also provided.
22 *
23 * When operating in synchronous mode, each call to mgsl_write()
24 * contains exactly one complete HDLC frame. Calling mgsl_put_char
25 * will start assembling an HDLC frame that will not be sent until
26 * mgsl_flush_chars or mgsl_write is called.
27 *
28 * Synchronous receive data is reported as complete frames. To accomplish
29 * this, the TTY flip buffer is bypassed (too small to hold largest
30 * frame and may fragment frames) and the line discipline
31 * receive entry point is called directly.
32 *
33 * This driver has been tested with a slightly modified ppp.c driver
34 * for synchronous PPP.
35 *
36 * 2000/02/16
37 * Added interface for syncppp.c driver (an alternate synchronous PPP
38 * implementation that also supports Cisco HDLC). Each device instance
39 * registers as a tty device AND a network device (if dosyncppp option
40 * is set for the device). The functionality is determined by which
41 * device interface is opened.
42 *
43 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
44 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
45 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
46 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
47 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
48 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
49 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
51 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
52 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
53 * OF THE POSSIBILITY OF SUCH DAMAGE.
54 */
55
56 #if defined(__i386__)
57 # define BREAKPOINT() asm(" int $3");
58 #else
59 # define BREAKPOINT() { }
60 #endif
61
62 #define MAX_ISA_DEVICES 10
63 #define MAX_PCI_DEVICES 10
64 #define MAX_TOTAL_DEVICES 20
65
66 #include <linux/module.h>
67 #include <linux/errno.h>
68 #include <linux/signal.h>
69 #include <linux/sched.h>
70 #include <linux/timer.h>
71 #include <linux/interrupt.h>
72 #include <linux/pci.h>
73 #include <linux/tty.h>
74 #include <linux/tty_flip.h>
75 #include <linux/serial.h>
76 #include <linux/major.h>
77 #include <linux/string.h>
78 #include <linux/fcntl.h>
79 #include <linux/ptrace.h>
80 #include <linux/ioport.h>
81 #include <linux/mm.h>
82 #include <linux/slab.h>
83 #include <linux/delay.h>
84 #include <linux/netdevice.h>
85 #include <linux/vmalloc.h>
86 #include <linux/init.h>
87 #include <linux/ioctl.h>
88 #include <linux/synclink.h>
89
90 #include <asm/system.h>
91 #include <asm/io.h>
92 #include <asm/irq.h>
93 #include <asm/dma.h>
94 #include <linux/bitops.h>
95 #include <asm/types.h>
96 #include <linux/termios.h>
97 #include <linux/workqueue.h>
98 #include <linux/hdlc.h>
99 #include <linux/dma-mapping.h>
100
101 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_MODULE))
102 #define SYNCLINK_GENERIC_HDLC 1
103 #else
104 #define SYNCLINK_GENERIC_HDLC 0
105 #endif
106
107 #define GET_USER(error,value,addr) error = get_user(value,addr)
108 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
109 #define PUT_USER(error,value,addr) error = put_user(value,addr)
110 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
111
112 #include <asm/uaccess.h>
113
114 #define RCLRVALUE 0xffff
115
116 static MGSL_PARAMS default_params = {
117 MGSL_MODE_HDLC, /* unsigned long mode */
118 0, /* unsigned char loopback; */
119 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
120 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
121 0, /* unsigned long clock_speed; */
122 0xff, /* unsigned char addr_filter; */
123 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
124 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
125 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
126 9600, /* unsigned long data_rate; */
127 8, /* unsigned char data_bits; */
128 1, /* unsigned char stop_bits; */
129 ASYNC_PARITY_NONE /* unsigned char parity; */
130 };
131
132 #define SHARED_MEM_ADDRESS_SIZE 0x40000
133 #define BUFFERLISTSIZE 4096
134 #define DMABUFFERSIZE 4096
135 #define MAXRXFRAMES 7
136
137 typedef struct _DMABUFFERENTRY
138 {
139 u32 phys_addr; /* 32-bit flat physical address of data buffer */
140 volatile u16 count; /* buffer size/data count */
141 volatile u16 status; /* Control/status field */
142 volatile u16 rcc; /* character count field */
143 u16 reserved; /* padding required by 16C32 */
144 u32 link; /* 32-bit flat link to next buffer entry */
145 char *virt_addr; /* virtual address of data buffer */
146 u32 phys_entry; /* physical address of this buffer entry */
147 dma_addr_t dma_addr;
148 } DMABUFFERENTRY, *DMAPBUFFERENTRY;
149
150 /* The queue of BH actions to be performed */
151
152 #define BH_RECEIVE 1
153 #define BH_TRANSMIT 2
154 #define BH_STATUS 4
155
156 #define IO_PIN_SHUTDOWN_LIMIT 100
157
158 struct _input_signal_events {
159 int ri_up;
160 int ri_down;
161 int dsr_up;
162 int dsr_down;
163 int dcd_up;
164 int dcd_down;
165 int cts_up;
166 int cts_down;
167 };
168
169 /* transmit holding buffer definitions*/
170 #define MAX_TX_HOLDING_BUFFERS 5
171 struct tx_holding_buffer {
172 int buffer_size;
173 unsigned char * buffer;
174 };
175
176
177 /*
178 * Device instance data structure
179 */
180
181 struct mgsl_struct {
182 int magic;
183 int flags;
184 int count; /* count of opens */
185 int line;
186 int hw_version;
187 unsigned short close_delay;
188 unsigned short closing_wait; /* time to wait before closing */
189
190 struct mgsl_icount icount;
191
192 struct tty_struct *tty;
193 int timeout;
194 int x_char; /* xon/xoff character */
195 int blocked_open; /* # of blocked opens */
196 u16 read_status_mask;
197 u16 ignore_status_mask;
198 unsigned char *xmit_buf;
199 int xmit_head;
200 int xmit_tail;
201 int xmit_cnt;
202
203 wait_queue_head_t open_wait;
204 wait_queue_head_t close_wait;
205
206 wait_queue_head_t status_event_wait_q;
207 wait_queue_head_t event_wait_q;
208 struct timer_list tx_timer; /* HDLC transmit timeout timer */
209 struct mgsl_struct *next_device; /* device list link */
210
211 spinlock_t irq_spinlock; /* spinlock for synchronizing with ISR */
212 struct work_struct task; /* task structure for scheduling bh */
213
214 u32 EventMask; /* event trigger mask */
215 u32 RecordedEvents; /* pending events */
216
217 u32 max_frame_size; /* as set by device config */
218
219 u32 pending_bh;
220
221 int bh_running; /* Protection from multiple */
222 int isr_overflow;
223 int bh_requested;
224
225 int dcd_chkcount; /* check counts to prevent */
226 int cts_chkcount; /* too many IRQs if a signal */
227 int dsr_chkcount; /* is floating */
228 int ri_chkcount;
229
230 char *buffer_list; /* virtual address of Rx & Tx buffer lists */
231 u32 buffer_list_phys;
232 dma_addr_t buffer_list_dma_addr;
233
234 unsigned int rx_buffer_count; /* count of total allocated Rx buffers */
235 DMABUFFERENTRY *rx_buffer_list; /* list of receive buffer entries */
236 unsigned int current_rx_buffer;
237
238 int num_tx_dma_buffers; /* number of tx dma frames required */
239 int tx_dma_buffers_used;
240 unsigned int tx_buffer_count; /* count of total allocated Tx buffers */
241 DMABUFFERENTRY *tx_buffer_list; /* list of transmit buffer entries */
242 int start_tx_dma_buffer; /* tx dma buffer to start tx dma operation */
243 int current_tx_buffer; /* next tx dma buffer to be loaded */
244
245 unsigned char *intermediate_rxbuffer;
246
247 int num_tx_holding_buffers; /* number of tx holding buffer allocated */
248 int get_tx_holding_index; /* next tx holding buffer for adapter to load */
249 int put_tx_holding_index; /* next tx holding buffer to store user request */
250 int tx_holding_count; /* number of tx holding buffers waiting */
251 struct tx_holding_buffer tx_holding_buffers[MAX_TX_HOLDING_BUFFERS];
252
253 int rx_enabled;
254 int rx_overflow;
255 int rx_rcc_underrun;
256
257 int tx_enabled;
258 int tx_active;
259 u32 idle_mode;
260
261 u16 cmr_value;
262 u16 tcsr_value;
263
264 char device_name[25]; /* device instance name */
265
266 unsigned int bus_type; /* expansion bus type (ISA,EISA,PCI) */
267 unsigned char bus; /* expansion bus number (zero based) */
268 unsigned char function; /* PCI device number */
269
270 unsigned int io_base; /* base I/O address of adapter */
271 unsigned int io_addr_size; /* size of the I/O address range */
272 int io_addr_requested; /* nonzero if I/O address requested */
273
274 unsigned int irq_level; /* interrupt level */
275 unsigned long irq_flags;
276 int irq_requested; /* nonzero if IRQ requested */
277
278 unsigned int dma_level; /* DMA channel */
279 int dma_requested; /* nonzero if dma channel requested */
280
281 u16 mbre_bit;
282 u16 loopback_bits;
283 u16 usc_idle_mode;
284
285 MGSL_PARAMS params; /* communications parameters */
286
287 unsigned char serial_signals; /* current serial signal states */
288
289 int irq_occurred; /* for diagnostics use */
290 unsigned int init_error; /* Initialization startup error (DIAGS) */
291 int fDiagnosticsmode; /* Driver in Diagnostic mode? (DIAGS) */
292
293 u32 last_mem_alloc;
294 unsigned char* memory_base; /* shared memory address (PCI only) */
295 u32 phys_memory_base;
296 int shared_mem_requested;
297
298 unsigned char* lcr_base; /* local config registers (PCI only) */
299 u32 phys_lcr_base;
300 u32 lcr_offset;
301 int lcr_mem_requested;
302
303 u32 misc_ctrl_value;
304 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
305 char char_buf[MAX_ASYNC_BUFFER_SIZE];
306 BOOLEAN drop_rts_on_tx_done;
307
308 BOOLEAN loopmode_insert_requested;
309 BOOLEAN loopmode_send_done_requested;
310
311 struct _input_signal_events input_signal_events;
312
313 /* generic HDLC device parts */
314 int netcount;
315 int dosyncppp;
316 spinlock_t netlock;
317
318 #if SYNCLINK_GENERIC_HDLC
319 struct net_device *netdev;
320 #endif
321 };
322
323 #define MGSL_MAGIC 0x5401
324
325 /*
326 * The size of the serial xmit buffer is 1 page, or 4096 bytes
327 */
328 #ifndef SERIAL_XMIT_SIZE
329 #define SERIAL_XMIT_SIZE 4096
330 #endif
331
332 /*
333 * These macros define the offsets used in calculating the
334 * I/O address of the specified USC registers.
335 */
336
337
338 #define DCPIN 2 /* Bit 1 of I/O address */
339 #define SDPIN 4 /* Bit 2 of I/O address */
340
341 #define DCAR 0 /* DMA command/address register */
342 #define CCAR SDPIN /* channel command/address register */
343 #define DATAREG DCPIN + SDPIN /* serial data register */
344 #define MSBONLY 0x41
345 #define LSBONLY 0x40
346
347 /*
348 * These macros define the register address (ordinal number)
349 * used for writing address/value pairs to the USC.
350 */
351
352 #define CMR 0x02 /* Channel mode Register */
353 #define CCSR 0x04 /* Channel Command/status Register */
354 #define CCR 0x06 /* Channel Control Register */
355 #define PSR 0x08 /* Port status Register */
356 #define PCR 0x0a /* Port Control Register */
357 #define TMDR 0x0c /* Test mode Data Register */
358 #define TMCR 0x0e /* Test mode Control Register */
359 #define CMCR 0x10 /* Clock mode Control Register */
360 #define HCR 0x12 /* Hardware Configuration Register */
361 #define IVR 0x14 /* Interrupt Vector Register */
362 #define IOCR 0x16 /* Input/Output Control Register */
363 #define ICR 0x18 /* Interrupt Control Register */
364 #define DCCR 0x1a /* Daisy Chain Control Register */
365 #define MISR 0x1c /* Misc Interrupt status Register */
366 #define SICR 0x1e /* status Interrupt Control Register */
367 #define RDR 0x20 /* Receive Data Register */
368 #define RMR 0x22 /* Receive mode Register */
369 #define RCSR 0x24 /* Receive Command/status Register */
370 #define RICR 0x26 /* Receive Interrupt Control Register */
371 #define RSR 0x28 /* Receive Sync Register */
372 #define RCLR 0x2a /* Receive count Limit Register */
373 #define RCCR 0x2c /* Receive Character count Register */
374 #define TC0R 0x2e /* Time Constant 0 Register */
375 #define TDR 0x30 /* Transmit Data Register */
376 #define TMR 0x32 /* Transmit mode Register */
377 #define TCSR 0x34 /* Transmit Command/status Register */
378 #define TICR 0x36 /* Transmit Interrupt Control Register */
379 #define TSR 0x38 /* Transmit Sync Register */
380 #define TCLR 0x3a /* Transmit count Limit Register */
381 #define TCCR 0x3c /* Transmit Character count Register */
382 #define TC1R 0x3e /* Time Constant 1 Register */
383
384
385 /*
386 * MACRO DEFINITIONS FOR DMA REGISTERS
387 */
388
389 #define DCR 0x06 /* DMA Control Register (shared) */
390 #define DACR 0x08 /* DMA Array count Register (shared) */
391 #define BDCR 0x12 /* Burst/Dwell Control Register (shared) */
392 #define DIVR 0x14 /* DMA Interrupt Vector Register (shared) */
393 #define DICR 0x18 /* DMA Interrupt Control Register (shared) */
394 #define CDIR 0x1a /* Clear DMA Interrupt Register (shared) */
395 #define SDIR 0x1c /* Set DMA Interrupt Register (shared) */
396
397 #define TDMR 0x02 /* Transmit DMA mode Register */
398 #define TDIAR 0x1e /* Transmit DMA Interrupt Arm Register */
399 #define TBCR 0x2a /* Transmit Byte count Register */
400 #define TARL 0x2c /* Transmit Address Register (low) */
401 #define TARU 0x2e /* Transmit Address Register (high) */
402 #define NTBCR 0x3a /* Next Transmit Byte count Register */
403 #define NTARL 0x3c /* Next Transmit Address Register (low) */
404 #define NTARU 0x3e /* Next Transmit Address Register (high) */
405
406 #define RDMR 0x82 /* Receive DMA mode Register (non-shared) */
407 #define RDIAR 0x9e /* Receive DMA Interrupt Arm Register */
408 #define RBCR 0xaa /* Receive Byte count Register */
409 #define RARL 0xac /* Receive Address Register (low) */
410 #define RARU 0xae /* Receive Address Register (high) */
411 #define NRBCR 0xba /* Next Receive Byte count Register */
412 #define NRARL 0xbc /* Next Receive Address Register (low) */
413 #define NRARU 0xbe /* Next Receive Address Register (high) */
414
415
416 /*
417 * MACRO DEFINITIONS FOR MODEM STATUS BITS
418 */
419
420 #define MODEMSTATUS_DTR 0x80
421 #define MODEMSTATUS_DSR 0x40
422 #define MODEMSTATUS_RTS 0x20
423 #define MODEMSTATUS_CTS 0x10
424 #define MODEMSTATUS_RI 0x04
425 #define MODEMSTATUS_DCD 0x01
426
427
428 /*
429 * Channel Command/Address Register (CCAR) Command Codes
430 */
431
432 #define RTCmd_Null 0x0000
433 #define RTCmd_ResetHighestIus 0x1000
434 #define RTCmd_TriggerChannelLoadDma 0x2000
435 #define RTCmd_TriggerRxDma 0x2800
436 #define RTCmd_TriggerTxDma 0x3000
437 #define RTCmd_TriggerRxAndTxDma 0x3800
438 #define RTCmd_PurgeRxFifo 0x4800
439 #define RTCmd_PurgeTxFifo 0x5000
440 #define RTCmd_PurgeRxAndTxFifo 0x5800
441 #define RTCmd_LoadRcc 0x6800
442 #define RTCmd_LoadTcc 0x7000
443 #define RTCmd_LoadRccAndTcc 0x7800
444 #define RTCmd_LoadTC0 0x8800
445 #define RTCmd_LoadTC1 0x9000
446 #define RTCmd_LoadTC0AndTC1 0x9800
447 #define RTCmd_SerialDataLSBFirst 0xa000
448 #define RTCmd_SerialDataMSBFirst 0xa800
449 #define RTCmd_SelectBigEndian 0xb000
450 #define RTCmd_SelectLittleEndian 0xb800
451
452
453 /*
454 * DMA Command/Address Register (DCAR) Command Codes
455 */
456
457 #define DmaCmd_Null 0x0000
458 #define DmaCmd_ResetTxChannel 0x1000
459 #define DmaCmd_ResetRxChannel 0x1200
460 #define DmaCmd_StartTxChannel 0x2000
461 #define DmaCmd_StartRxChannel 0x2200
462 #define DmaCmd_ContinueTxChannel 0x3000
463 #define DmaCmd_ContinueRxChannel 0x3200
464 #define DmaCmd_PauseTxChannel 0x4000
465 #define DmaCmd_PauseRxChannel 0x4200
466 #define DmaCmd_AbortTxChannel 0x5000
467 #define DmaCmd_AbortRxChannel 0x5200
468 #define DmaCmd_InitTxChannel 0x7000
469 #define DmaCmd_InitRxChannel 0x7200
470 #define DmaCmd_ResetHighestDmaIus 0x8000
471 #define DmaCmd_ResetAllChannels 0x9000
472 #define DmaCmd_StartAllChannels 0xa000
473 #define DmaCmd_ContinueAllChannels 0xb000
474 #define DmaCmd_PauseAllChannels 0xc000
475 #define DmaCmd_AbortAllChannels 0xd000
476 #define DmaCmd_InitAllChannels 0xf000
477
478 #define TCmd_Null 0x0000
479 #define TCmd_ClearTxCRC 0x2000
480 #define TCmd_SelectTicrTtsaData 0x4000
481 #define TCmd_SelectTicrTxFifostatus 0x5000
482 #define TCmd_SelectTicrIntLevel 0x6000
483 #define TCmd_SelectTicrdma_level 0x7000
484 #define TCmd_SendFrame 0x8000
485 #define TCmd_SendAbort 0x9000
486 #define TCmd_EnableDleInsertion 0xc000
487 #define TCmd_DisableDleInsertion 0xd000
488 #define TCmd_ClearEofEom 0xe000
489 #define TCmd_SetEofEom 0xf000
490
491 #define RCmd_Null 0x0000
492 #define RCmd_ClearRxCRC 0x2000
493 #define RCmd_EnterHuntmode 0x3000
494 #define RCmd_SelectRicrRtsaData 0x4000
495 #define RCmd_SelectRicrRxFifostatus 0x5000
496 #define RCmd_SelectRicrIntLevel 0x6000
497 #define RCmd_SelectRicrdma_level 0x7000
498
499 /*
500 * Bits for enabling and disabling IRQs in Interrupt Control Register (ICR)
501 */
502
503 #define RECEIVE_STATUS BIT5
504 #define RECEIVE_DATA BIT4
505 #define TRANSMIT_STATUS BIT3
506 #define TRANSMIT_DATA BIT2
507 #define IO_PIN BIT1
508 #define MISC BIT0
509
510
511 /*
512 * Receive status Bits in Receive Command/status Register RCSR
513 */
514
515 #define RXSTATUS_SHORT_FRAME BIT8
516 #define RXSTATUS_CODE_VIOLATION BIT8
517 #define RXSTATUS_EXITED_HUNT BIT7
518 #define RXSTATUS_IDLE_RECEIVED BIT6
519 #define RXSTATUS_BREAK_RECEIVED BIT5
520 #define RXSTATUS_ABORT_RECEIVED BIT5
521 #define RXSTATUS_RXBOUND BIT4
522 #define RXSTATUS_CRC_ERROR BIT3
523 #define RXSTATUS_FRAMING_ERROR BIT3
524 #define RXSTATUS_ABORT BIT2
525 #define RXSTATUS_PARITY_ERROR BIT2
526 #define RXSTATUS_OVERRUN BIT1
527 #define RXSTATUS_DATA_AVAILABLE BIT0
528 #define RXSTATUS_ALL 0x01f6
529 #define usc_UnlatchRxstatusBits(a,b) usc_OutReg( (a), RCSR, (u16)((b) & RXSTATUS_ALL) )
530
531 /*
532 * Values for setting transmit idle mode in
533 * Transmit Control/status Register (TCSR)
534 */
535 #define IDLEMODE_FLAGS 0x0000
536 #define IDLEMODE_ALT_ONE_ZERO 0x0100
537 #define IDLEMODE_ZERO 0x0200
538 #define IDLEMODE_ONE 0x0300
539 #define IDLEMODE_ALT_MARK_SPACE 0x0500
540 #define IDLEMODE_SPACE 0x0600
541 #define IDLEMODE_MARK 0x0700
542 #define IDLEMODE_MASK 0x0700
543
544 /*
545 * IUSC revision identifiers
546 */
547 #define IUSC_SL1660 0x4d44
548 #define IUSC_PRE_SL1660 0x4553
549
550 /*
551 * Transmit status Bits in Transmit Command/status Register (TCSR)
552 */
553
554 #define TCSR_PRESERVE 0x0F00
555
556 #define TCSR_UNDERWAIT BIT11
557 #define TXSTATUS_PREAMBLE_SENT BIT7
558 #define TXSTATUS_IDLE_SENT BIT6
559 #define TXSTATUS_ABORT_SENT BIT5
560 #define TXSTATUS_EOF_SENT BIT4
561 #define TXSTATUS_EOM_SENT BIT4
562 #define TXSTATUS_CRC_SENT BIT3
563 #define TXSTATUS_ALL_SENT BIT2
564 #define TXSTATUS_UNDERRUN BIT1
565 #define TXSTATUS_FIFO_EMPTY BIT0
566 #define TXSTATUS_ALL 0x00fa
567 #define usc_UnlatchTxstatusBits(a,b) usc_OutReg( (a), TCSR, (u16)((a)->tcsr_value + ((b) & 0x00FF)) )
568
569
570 #define MISCSTATUS_RXC_LATCHED BIT15
571 #define MISCSTATUS_RXC BIT14
572 #define MISCSTATUS_TXC_LATCHED BIT13
573 #define MISCSTATUS_TXC BIT12
574 #define MISCSTATUS_RI_LATCHED BIT11
575 #define MISCSTATUS_RI BIT10
576 #define MISCSTATUS_DSR_LATCHED BIT9
577 #define MISCSTATUS_DSR BIT8
578 #define MISCSTATUS_DCD_LATCHED BIT7
579 #define MISCSTATUS_DCD BIT6
580 #define MISCSTATUS_CTS_LATCHED BIT5
581 #define MISCSTATUS_CTS BIT4
582 #define MISCSTATUS_RCC_UNDERRUN BIT3
583 #define MISCSTATUS_DPLL_NO_SYNC BIT2
584 #define MISCSTATUS_BRG1_ZERO BIT1
585 #define MISCSTATUS_BRG0_ZERO BIT0
586
587 #define usc_UnlatchIostatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0xaaa0))
588 #define usc_UnlatchMiscstatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0x000f))
589
590 #define SICR_RXC_ACTIVE BIT15
591 #define SICR_RXC_INACTIVE BIT14
592 #define SICR_RXC (BIT15+BIT14)
593 #define SICR_TXC_ACTIVE BIT13
594 #define SICR_TXC_INACTIVE BIT12
595 #define SICR_TXC (BIT13+BIT12)
596 #define SICR_RI_ACTIVE BIT11
597 #define SICR_RI_INACTIVE BIT10
598 #define SICR_RI (BIT11+BIT10)
599 #define SICR_DSR_ACTIVE BIT9
600 #define SICR_DSR_INACTIVE BIT8
601 #define SICR_DSR (BIT9+BIT8)
602 #define SICR_DCD_ACTIVE BIT7
603 #define SICR_DCD_INACTIVE BIT6
604 #define SICR_DCD (BIT7+BIT6)
605 #define SICR_CTS_ACTIVE BIT5
606 #define SICR_CTS_INACTIVE BIT4
607 #define SICR_CTS (BIT5+BIT4)
608 #define SICR_RCC_UNDERFLOW BIT3
609 #define SICR_DPLL_NO_SYNC BIT2
610 #define SICR_BRG1_ZERO BIT1
611 #define SICR_BRG0_ZERO BIT0
612
613 void usc_DisableMasterIrqBit( struct mgsl_struct *info );
614 void usc_EnableMasterIrqBit( struct mgsl_struct *info );
615 void usc_EnableInterrupts( struct mgsl_struct *info, u16 IrqMask );
616 void usc_DisableInterrupts( struct mgsl_struct *info, u16 IrqMask );
617 void usc_ClearIrqPendingBits( struct mgsl_struct *info, u16 IrqMask );
618
619 #define usc_EnableInterrupts( a, b ) \
620 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0xc0 + (b)) )
621
622 #define usc_DisableInterrupts( a, b ) \
623 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0x80 + (b)) )
624
625 #define usc_EnableMasterIrqBit(a) \
626 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0x0f00) + 0xb000) )
627
628 #define usc_DisableMasterIrqBit(a) \
629 usc_OutReg( (a), ICR, (u16)(usc_InReg((a),ICR) & 0x7f00) )
630
631 #define usc_ClearIrqPendingBits( a, b ) usc_OutReg( (a), DCCR, 0x40 + (b) )
632
633 /*
634 * Transmit status Bits in Transmit Control status Register (TCSR)
635 * and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0)
636 */
637
638 #define TXSTATUS_PREAMBLE_SENT BIT7
639 #define TXSTATUS_IDLE_SENT BIT6
640 #define TXSTATUS_ABORT_SENT BIT5
641 #define TXSTATUS_EOF BIT4
642 #define TXSTATUS_CRC_SENT BIT3
643 #define TXSTATUS_ALL_SENT BIT2
644 #define TXSTATUS_UNDERRUN BIT1
645 #define TXSTATUS_FIFO_EMPTY BIT0
646
647 #define DICR_MASTER BIT15
648 #define DICR_TRANSMIT BIT0
649 #define DICR_RECEIVE BIT1
650
651 #define usc_EnableDmaInterrupts(a,b) \
652 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) | (b)) )
653
654 #define usc_DisableDmaInterrupts(a,b) \
655 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) & ~(b)) )
656
657 #define usc_EnableStatusIrqs(a,b) \
658 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) | (b)) )
659
660 #define usc_DisablestatusIrqs(a,b) \
661 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) & ~(b)) )
662
663 /* Transmit status Bits in Transmit Control status Register (TCSR) */
664 /* and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0) */
665
666
667 #define DISABLE_UNCONDITIONAL 0
668 #define DISABLE_END_OF_FRAME 1
669 #define ENABLE_UNCONDITIONAL 2
670 #define ENABLE_AUTO_CTS 3
671 #define ENABLE_AUTO_DCD 3
672 #define usc_EnableTransmitter(a,b) \
673 usc_OutReg( (a), TMR, (u16)((usc_InReg((a),TMR) & 0xfffc) | (b)) )
674 #define usc_EnableReceiver(a,b) \
675 usc_OutReg( (a), RMR, (u16)((usc_InReg((a),RMR) & 0xfffc) | (b)) )
676
677 static u16 usc_InDmaReg( struct mgsl_struct *info, u16 Port );
678 static void usc_OutDmaReg( struct mgsl_struct *info, u16 Port, u16 Value );
679 static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd );
680
681 static u16 usc_InReg( struct mgsl_struct *info, u16 Port );
682 static void usc_OutReg( struct mgsl_struct *info, u16 Port, u16 Value );
683 static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd );
684 void usc_RCmd( struct mgsl_struct *info, u16 Cmd );
685 void usc_TCmd( struct mgsl_struct *info, u16 Cmd );
686
687 #define usc_TCmd(a,b) usc_OutReg((a), TCSR, (u16)((a)->tcsr_value + (b)))
688 #define usc_RCmd(a,b) usc_OutReg((a), RCSR, (b))
689
690 #define usc_SetTransmitSyncChars(a,s0,s1) usc_OutReg((a), TSR, (u16)(((u16)s0<<8)|(u16)s1))
691
692 static void usc_process_rxoverrun_sync( struct mgsl_struct *info );
693 static void usc_start_receiver( struct mgsl_struct *info );
694 static void usc_stop_receiver( struct mgsl_struct *info );
695
696 static void usc_start_transmitter( struct mgsl_struct *info );
697 static void usc_stop_transmitter( struct mgsl_struct *info );
698 static void usc_set_txidle( struct mgsl_struct *info );
699 static void usc_load_txfifo( struct mgsl_struct *info );
700
701 static void usc_enable_aux_clock( struct mgsl_struct *info, u32 DataRate );
702 static void usc_enable_loopback( struct mgsl_struct *info, int enable );
703
704 static void usc_get_serial_signals( struct mgsl_struct *info );
705 static void usc_set_serial_signals( struct mgsl_struct *info );
706
707 static void usc_reset( struct mgsl_struct *info );
708
709 static void usc_set_sync_mode( struct mgsl_struct *info );
710 static void usc_set_sdlc_mode( struct mgsl_struct *info );
711 static void usc_set_async_mode( struct mgsl_struct *info );
712 static void usc_enable_async_clock( struct mgsl_struct *info, u32 DataRate );
713
714 static void usc_loopback_frame( struct mgsl_struct *info );
715
716 static void mgsl_tx_timeout(unsigned long context);
717
718
719 static void usc_loopmode_cancel_transmit( struct mgsl_struct * info );
720 static void usc_loopmode_insert_request( struct mgsl_struct * info );
721 static int usc_loopmode_active( struct mgsl_struct * info);
722 static void usc_loopmode_send_done( struct mgsl_struct * info );
723
724 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg);
725
726 #if SYNCLINK_GENERIC_HDLC
727 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
728 static void hdlcdev_tx_done(struct mgsl_struct *info);
729 static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size);
730 static int hdlcdev_init(struct mgsl_struct *info);
731 static void hdlcdev_exit(struct mgsl_struct *info);
732 #endif
733
734 /*
735 * Defines a BUS descriptor value for the PCI adapter
736 * local bus address ranges.
737 */
738
739 #define BUS_DESCRIPTOR( WrHold, WrDly, RdDly, Nwdd, Nwad, Nxda, Nrdd, Nrad ) \
740 (0x00400020 + \
741 ((WrHold) << 30) + \
742 ((WrDly) << 28) + \
743 ((RdDly) << 26) + \
744 ((Nwdd) << 20) + \
745 ((Nwad) << 15) + \
746 ((Nxda) << 13) + \
747 ((Nrdd) << 11) + \
748 ((Nrad) << 6) )
749
750 static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit);
751
752 /*
753 * Adapter diagnostic routines
754 */
755 static BOOLEAN mgsl_register_test( struct mgsl_struct *info );
756 static BOOLEAN mgsl_irq_test( struct mgsl_struct *info );
757 static BOOLEAN mgsl_dma_test( struct mgsl_struct *info );
758 static BOOLEAN mgsl_memory_test( struct mgsl_struct *info );
759 static int mgsl_adapter_test( struct mgsl_struct *info );
760
761 /*
762 * device and resource management routines
763 */
764 static int mgsl_claim_resources(struct mgsl_struct *info);
765 static void mgsl_release_resources(struct mgsl_struct *info);
766 static void mgsl_add_device(struct mgsl_struct *info);
767 static struct mgsl_struct* mgsl_allocate_device(void);
768
769 /*
770 * DMA buffer manupulation functions.
771 */
772 static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex );
773 static int mgsl_get_rx_frame( struct mgsl_struct *info );
774 static int mgsl_get_raw_rx_frame( struct mgsl_struct *info );
775 static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info );
776 static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info );
777 static int num_free_tx_dma_buffers(struct mgsl_struct *info);
778 static void mgsl_load_tx_dma_buffer( struct mgsl_struct *info, const char *Buffer, unsigned int BufferSize);
779 static void mgsl_load_pci_memory(char* TargetPtr, const char* SourcePtr, unsigned short count);
780
781 /*
782 * DMA and Shared Memory buffer allocation and formatting
783 */
784 static int mgsl_allocate_dma_buffers(struct mgsl_struct *info);
785 static void mgsl_free_dma_buffers(struct mgsl_struct *info);
786 static int mgsl_alloc_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
787 static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
788 static int mgsl_alloc_buffer_list_memory(struct mgsl_struct *info);
789 static void mgsl_free_buffer_list_memory(struct mgsl_struct *info);
790 static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info);
791 static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info);
792 static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info);
793 static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info);
794 static int load_next_tx_holding_buffer(struct mgsl_struct *info);
795 static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize);
796
797 /*
798 * Bottom half interrupt handlers
799 */
800 static void mgsl_bh_handler(struct work_struct *work);
801 static void mgsl_bh_receive(struct mgsl_struct *info);
802 static void mgsl_bh_transmit(struct mgsl_struct *info);
803 static void mgsl_bh_status(struct mgsl_struct *info);
804
805 /*
806 * Interrupt handler routines and dispatch table.
807 */
808 static void mgsl_isr_null( struct mgsl_struct *info );
809 static void mgsl_isr_transmit_data( struct mgsl_struct *info );
810 static void mgsl_isr_receive_data( struct mgsl_struct *info );
811 static void mgsl_isr_receive_status( struct mgsl_struct *info );
812 static void mgsl_isr_transmit_status( struct mgsl_struct *info );
813 static void mgsl_isr_io_pin( struct mgsl_struct *info );
814 static void mgsl_isr_misc( struct mgsl_struct *info );
815 static void mgsl_isr_receive_dma( struct mgsl_struct *info );
816 static void mgsl_isr_transmit_dma( struct mgsl_struct *info );
817
818 typedef void (*isr_dispatch_func)(struct mgsl_struct *);
819
820 static isr_dispatch_func UscIsrTable[7] =
821 {
822 mgsl_isr_null,
823 mgsl_isr_misc,
824 mgsl_isr_io_pin,
825 mgsl_isr_transmit_data,
826 mgsl_isr_transmit_status,
827 mgsl_isr_receive_data,
828 mgsl_isr_receive_status
829 };
830
831 /*
832 * ioctl call handlers
833 */
834 static int tiocmget(struct tty_struct *tty, struct file *file);
835 static int tiocmset(struct tty_struct *tty, struct file *file,
836 unsigned int set, unsigned int clear);
837 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount
838 __user *user_icount);
839 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params);
840 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params);
841 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode);
842 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode);
843 static int mgsl_txenable(struct mgsl_struct * info, int enable);
844 static int mgsl_txabort(struct mgsl_struct * info);
845 static int mgsl_rxenable(struct mgsl_struct * info, int enable);
846 static int mgsl_wait_event(struct mgsl_struct * info, int __user *mask);
847 static int mgsl_loopmode_send_done( struct mgsl_struct * info );
848
849 /* set non-zero on successful registration with PCI subsystem */
850 static int pci_registered;
851
852 /*
853 * Global linked list of SyncLink devices
854 */
855 static struct mgsl_struct *mgsl_device_list;
856 static int mgsl_device_count;
857
858 /*
859 * Set this param to non-zero to load eax with the
860 * .text section address and breakpoint on module load.
861 * This is useful for use with gdb and add-symbol-file command.
862 */
863 static int break_on_load;
864
865 /*
866 * Driver major number, defaults to zero to get auto
867 * assigned major number. May be forced as module parameter.
868 */
869 static int ttymajor;
870
871 /*
872 * Array of user specified options for ISA adapters.
873 */
874 static int io[MAX_ISA_DEVICES];
875 static int irq[MAX_ISA_DEVICES];
876 static int dma[MAX_ISA_DEVICES];
877 static int debug_level;
878 static int maxframe[MAX_TOTAL_DEVICES];
879 static int dosyncppp[MAX_TOTAL_DEVICES];
880 static int txdmabufs[MAX_TOTAL_DEVICES];
881 static int txholdbufs[MAX_TOTAL_DEVICES];
882
883 module_param(break_on_load, bool, 0);
884 module_param(ttymajor, int, 0);
885 module_param_array(io, int, NULL, 0);
886 module_param_array(irq, int, NULL, 0);
887 module_param_array(dma, int, NULL, 0);
888 module_param(debug_level, int, 0);
889 module_param_array(maxframe, int, NULL, 0);
890 module_param_array(dosyncppp, int, NULL, 0);
891 module_param_array(txdmabufs, int, NULL, 0);
892 module_param_array(txholdbufs, int, NULL, 0);
893
894 static char *driver_name = "SyncLink serial driver";
895 static char *driver_version = "$Revision: 4.38 $";
896
897 static int synclink_init_one (struct pci_dev *dev,
898 const struct pci_device_id *ent);
899 static void synclink_remove_one (struct pci_dev *dev);
900
901 static struct pci_device_id synclink_pci_tbl[] = {
902 { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_USC, PCI_ANY_ID, PCI_ANY_ID, },
903 { PCI_VENDOR_ID_MICROGATE, 0x0210, PCI_ANY_ID, PCI_ANY_ID, },
904 { 0, }, /* terminate list */
905 };
906 MODULE_DEVICE_TABLE(pci, synclink_pci_tbl);
907
908 MODULE_LICENSE("GPL");
909
910 static struct pci_driver synclink_pci_driver = {
911 .name = "synclink",
912 .id_table = synclink_pci_tbl,
913 .probe = synclink_init_one,
914 .remove = __devexit_p(synclink_remove_one),
915 };
916
917 static struct tty_driver *serial_driver;
918
919 /* number of characters left in xmit buffer before we ask for more */
920 #define WAKEUP_CHARS 256
921
922
923 static void mgsl_change_params(struct mgsl_struct *info);
924 static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout);
925
926 /*
927 * 1st function defined in .text section. Calling this function in
928 * init_module() followed by a breakpoint allows a remote debugger
929 * (gdb) to get the .text address for the add-symbol-file command.
930 * This allows remote debugging of dynamically loadable modules.
931 */
932 static void* mgsl_get_text_ptr(void)
933 {
934 return mgsl_get_text_ptr;
935 }
936
937 static inline int mgsl_paranoia_check(struct mgsl_struct *info,
938 char *name, const char *routine)
939 {
940 #ifdef MGSL_PARANOIA_CHECK
941 static const char *badmagic =
942 "Warning: bad magic number for mgsl struct (%s) in %s\n";
943 static const char *badinfo =
944 "Warning: null mgsl_struct for (%s) in %s\n";
945
946 if (!info) {
947 printk(badinfo, name, routine);
948 return 1;
949 }
950 if (info->magic != MGSL_MAGIC) {
951 printk(badmagic, name, routine);
952 return 1;
953 }
954 #else
955 if (!info)
956 return 1;
957 #endif
958 return 0;
959 }
960
961 /**
962 * line discipline callback wrappers
963 *
964 * The wrappers maintain line discipline references
965 * while calling into the line discipline.
966 *
967 * ldisc_receive_buf - pass receive data to line discipline
968 */
969
970 static void ldisc_receive_buf(struct tty_struct *tty,
971 const __u8 *data, char *flags, int count)
972 {
973 struct tty_ldisc *ld;
974 if (!tty)
975 return;
976 ld = tty_ldisc_ref(tty);
977 if (ld) {
978 if (ld->receive_buf)
979 ld->receive_buf(tty, data, flags, count);
980 tty_ldisc_deref(ld);
981 }
982 }
983
984 /* mgsl_stop() throttle (stop) transmitter
985 *
986 * Arguments: tty pointer to tty info structure
987 * Return Value: None
988 */
989 static void mgsl_stop(struct tty_struct *tty)
990 {
991 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
992 unsigned long flags;
993
994 if (mgsl_paranoia_check(info, tty->name, "mgsl_stop"))
995 return;
996
997 if ( debug_level >= DEBUG_LEVEL_INFO )
998 printk("mgsl_stop(%s)\n",info->device_name);
999
1000 spin_lock_irqsave(&info->irq_spinlock,flags);
1001 if (info->tx_enabled)
1002 usc_stop_transmitter(info);
1003 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1004
1005 } /* end of mgsl_stop() */
1006
1007 /* mgsl_start() release (start) transmitter
1008 *
1009 * Arguments: tty pointer to tty info structure
1010 * Return Value: None
1011 */
1012 static void mgsl_start(struct tty_struct *tty)
1013 {
1014 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
1015 unsigned long flags;
1016
1017 if (mgsl_paranoia_check(info, tty->name, "mgsl_start"))
1018 return;
1019
1020 if ( debug_level >= DEBUG_LEVEL_INFO )
1021 printk("mgsl_start(%s)\n",info->device_name);
1022
1023 spin_lock_irqsave(&info->irq_spinlock,flags);
1024 if (!info->tx_enabled)
1025 usc_start_transmitter(info);
1026 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1027
1028 } /* end of mgsl_start() */
1029
1030 /*
1031 * Bottom half work queue access functions
1032 */
1033
1034 /* mgsl_bh_action() Return next bottom half action to perform.
1035 * Return Value: BH action code or 0 if nothing to do.
1036 */
1037 static int mgsl_bh_action(struct mgsl_struct *info)
1038 {
1039 unsigned long flags;
1040 int rc = 0;
1041
1042 spin_lock_irqsave(&info->irq_spinlock,flags);
1043
1044 if (info->pending_bh & BH_RECEIVE) {
1045 info->pending_bh &= ~BH_RECEIVE;
1046 rc = BH_RECEIVE;
1047 } else if (info->pending_bh & BH_TRANSMIT) {
1048 info->pending_bh &= ~BH_TRANSMIT;
1049 rc = BH_TRANSMIT;
1050 } else if (info->pending_bh & BH_STATUS) {
1051 info->pending_bh &= ~BH_STATUS;
1052 rc = BH_STATUS;
1053 }
1054
1055 if (!rc) {
1056 /* Mark BH routine as complete */
1057 info->bh_running = 0;
1058 info->bh_requested = 0;
1059 }
1060
1061 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1062
1063 return rc;
1064 }
1065
1066 /*
1067 * Perform bottom half processing of work items queued by ISR.
1068 */
1069 static void mgsl_bh_handler(struct work_struct *work)
1070 {
1071 struct mgsl_struct *info =
1072 container_of(work, struct mgsl_struct, task);
1073 int action;
1074
1075 if (!info)
1076 return;
1077
1078 if ( debug_level >= DEBUG_LEVEL_BH )
1079 printk( "%s(%d):mgsl_bh_handler(%s) entry\n",
1080 __FILE__,__LINE__,info->device_name);
1081
1082 info->bh_running = 1;
1083
1084 while((action = mgsl_bh_action(info)) != 0) {
1085
1086 /* Process work item */
1087 if ( debug_level >= DEBUG_LEVEL_BH )
1088 printk( "%s(%d):mgsl_bh_handler() work item action=%d\n",
1089 __FILE__,__LINE__,action);
1090
1091 switch (action) {
1092
1093 case BH_RECEIVE:
1094 mgsl_bh_receive(info);
1095 break;
1096 case BH_TRANSMIT:
1097 mgsl_bh_transmit(info);
1098 break;
1099 case BH_STATUS:
1100 mgsl_bh_status(info);
1101 break;
1102 default:
1103 /* unknown work item ID */
1104 printk("Unknown work item ID=%08X!\n", action);
1105 break;
1106 }
1107 }
1108
1109 if ( debug_level >= DEBUG_LEVEL_BH )
1110 printk( "%s(%d):mgsl_bh_handler(%s) exit\n",
1111 __FILE__,__LINE__,info->device_name);
1112 }
1113
1114 static void mgsl_bh_receive(struct mgsl_struct *info)
1115 {
1116 int (*get_rx_frame)(struct mgsl_struct *info) =
1117 (info->params.mode == MGSL_MODE_HDLC ? mgsl_get_rx_frame : mgsl_get_raw_rx_frame);
1118
1119 if ( debug_level >= DEBUG_LEVEL_BH )
1120 printk( "%s(%d):mgsl_bh_receive(%s)\n",
1121 __FILE__,__LINE__,info->device_name);
1122
1123 do
1124 {
1125 if (info->rx_rcc_underrun) {
1126 unsigned long flags;
1127 spin_lock_irqsave(&info->irq_spinlock,flags);
1128 usc_start_receiver(info);
1129 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1130 return;
1131 }
1132 } while(get_rx_frame(info));
1133 }
1134
1135 static void mgsl_bh_transmit(struct mgsl_struct *info)
1136 {
1137 struct tty_struct *tty = info->tty;
1138 unsigned long flags;
1139
1140 if ( debug_level >= DEBUG_LEVEL_BH )
1141 printk( "%s(%d):mgsl_bh_transmit() entry on %s\n",
1142 __FILE__,__LINE__,info->device_name);
1143
1144 if (tty)
1145 tty_wakeup(tty);
1146
1147 /* if transmitter idle and loopmode_send_done_requested
1148 * then start echoing RxD to TxD
1149 */
1150 spin_lock_irqsave(&info->irq_spinlock,flags);
1151 if ( !info->tx_active && info->loopmode_send_done_requested )
1152 usc_loopmode_send_done( info );
1153 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1154 }
1155
1156 static void mgsl_bh_status(struct mgsl_struct *info)
1157 {
1158 if ( debug_level >= DEBUG_LEVEL_BH )
1159 printk( "%s(%d):mgsl_bh_status() entry on %s\n",
1160 __FILE__,__LINE__,info->device_name);
1161
1162 info->ri_chkcount = 0;
1163 info->dsr_chkcount = 0;
1164 info->dcd_chkcount = 0;
1165 info->cts_chkcount = 0;
1166 }
1167
1168 /* mgsl_isr_receive_status()
1169 *
1170 * Service a receive status interrupt. The type of status
1171 * interrupt is indicated by the state of the RCSR.
1172 * This is only used for HDLC mode.
1173 *
1174 * Arguments: info pointer to device instance data
1175 * Return Value: None
1176 */
1177 static void mgsl_isr_receive_status( struct mgsl_struct *info )
1178 {
1179 u16 status = usc_InReg( info, RCSR );
1180
1181 if ( debug_level >= DEBUG_LEVEL_ISR )
1182 printk("%s(%d):mgsl_isr_receive_status status=%04X\n",
1183 __FILE__,__LINE__,status);
1184
1185 if ( (status & RXSTATUS_ABORT_RECEIVED) &&
1186 info->loopmode_insert_requested &&
1187 usc_loopmode_active(info) )
1188 {
1189 ++info->icount.rxabort;
1190 info->loopmode_insert_requested = FALSE;
1191
1192 /* clear CMR:13 to start echoing RxD to TxD */
1193 info->cmr_value &= ~BIT13;
1194 usc_OutReg(info, CMR, info->cmr_value);
1195
1196 /* disable received abort irq (no longer required) */
1197 usc_OutReg(info, RICR,
1198 (usc_InReg(info, RICR) & ~RXSTATUS_ABORT_RECEIVED));
1199 }
1200
1201 if (status & (RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED)) {
1202 if (status & RXSTATUS_EXITED_HUNT)
1203 info->icount.exithunt++;
1204 if (status & RXSTATUS_IDLE_RECEIVED)
1205 info->icount.rxidle++;
1206 wake_up_interruptible(&info->event_wait_q);
1207 }
1208
1209 if (status & RXSTATUS_OVERRUN){
1210 info->icount.rxover++;
1211 usc_process_rxoverrun_sync( info );
1212 }
1213
1214 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
1215 usc_UnlatchRxstatusBits( info, status );
1216
1217 } /* end of mgsl_isr_receive_status() */
1218
1219 /* mgsl_isr_transmit_status()
1220 *
1221 * Service a transmit status interrupt
1222 * HDLC mode :end of transmit frame
1223 * Async mode:all data is sent
1224 * transmit status is indicated by bits in the TCSR.
1225 *
1226 * Arguments: info pointer to device instance data
1227 * Return Value: None
1228 */
1229 static void mgsl_isr_transmit_status( struct mgsl_struct *info )
1230 {
1231 u16 status = usc_InReg( info, TCSR );
1232
1233 if ( debug_level >= DEBUG_LEVEL_ISR )
1234 printk("%s(%d):mgsl_isr_transmit_status status=%04X\n",
1235 __FILE__,__LINE__,status);
1236
1237 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
1238 usc_UnlatchTxstatusBits( info, status );
1239
1240 if ( status & (TXSTATUS_UNDERRUN | TXSTATUS_ABORT_SENT) )
1241 {
1242 /* finished sending HDLC abort. This may leave */
1243 /* the TxFifo with data from the aborted frame */
1244 /* so purge the TxFifo. Also shutdown the DMA */
1245 /* channel in case there is data remaining in */
1246 /* the DMA buffer */
1247 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
1248 usc_RTCmd( info, RTCmd_PurgeTxFifo );
1249 }
1250
1251 if ( status & TXSTATUS_EOF_SENT )
1252 info->icount.txok++;
1253 else if ( status & TXSTATUS_UNDERRUN )
1254 info->icount.txunder++;
1255 else if ( status & TXSTATUS_ABORT_SENT )
1256 info->icount.txabort++;
1257 else
1258 info->icount.txunder++;
1259
1260 info->tx_active = 0;
1261 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1262 del_timer(&info->tx_timer);
1263
1264 if ( info->drop_rts_on_tx_done ) {
1265 usc_get_serial_signals( info );
1266 if ( info->serial_signals & SerialSignal_RTS ) {
1267 info->serial_signals &= ~SerialSignal_RTS;
1268 usc_set_serial_signals( info );
1269 }
1270 info->drop_rts_on_tx_done = 0;
1271 }
1272
1273 #if SYNCLINK_GENERIC_HDLC
1274 if (info->netcount)
1275 hdlcdev_tx_done(info);
1276 else
1277 #endif
1278 {
1279 if (info->tty->stopped || info->tty->hw_stopped) {
1280 usc_stop_transmitter(info);
1281 return;
1282 }
1283 info->pending_bh |= BH_TRANSMIT;
1284 }
1285
1286 } /* end of mgsl_isr_transmit_status() */
1287
1288 /* mgsl_isr_io_pin()
1289 *
1290 * Service an Input/Output pin interrupt. The type of
1291 * interrupt is indicated by bits in the MISR
1292 *
1293 * Arguments: info pointer to device instance data
1294 * Return Value: None
1295 */
1296 static void mgsl_isr_io_pin( struct mgsl_struct *info )
1297 {
1298 struct mgsl_icount *icount;
1299 u16 status = usc_InReg( info, MISR );
1300
1301 if ( debug_level >= DEBUG_LEVEL_ISR )
1302 printk("%s(%d):mgsl_isr_io_pin status=%04X\n",
1303 __FILE__,__LINE__,status);
1304
1305 usc_ClearIrqPendingBits( info, IO_PIN );
1306 usc_UnlatchIostatusBits( info, status );
1307
1308 if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
1309 MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
1310 icount = &info->icount;
1311 /* update input line counters */
1312 if (status & MISCSTATUS_RI_LATCHED) {
1313 if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1314 usc_DisablestatusIrqs(info,SICR_RI);
1315 icount->rng++;
1316 if ( status & MISCSTATUS_RI )
1317 info->input_signal_events.ri_up++;
1318 else
1319 info->input_signal_events.ri_down++;
1320 }
1321 if (status & MISCSTATUS_DSR_LATCHED) {
1322 if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1323 usc_DisablestatusIrqs(info,SICR_DSR);
1324 icount->dsr++;
1325 if ( status & MISCSTATUS_DSR )
1326 info->input_signal_events.dsr_up++;
1327 else
1328 info->input_signal_events.dsr_down++;
1329 }
1330 if (status & MISCSTATUS_DCD_LATCHED) {
1331 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1332 usc_DisablestatusIrqs(info,SICR_DCD);
1333 icount->dcd++;
1334 if (status & MISCSTATUS_DCD) {
1335 info->input_signal_events.dcd_up++;
1336 } else
1337 info->input_signal_events.dcd_down++;
1338 #if SYNCLINK_GENERIC_HDLC
1339 if (info->netcount) {
1340 if (status & MISCSTATUS_DCD)
1341 netif_carrier_on(info->netdev);
1342 else
1343 netif_carrier_off(info->netdev);
1344 }
1345 #endif
1346 }
1347 if (status & MISCSTATUS_CTS_LATCHED)
1348 {
1349 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1350 usc_DisablestatusIrqs(info,SICR_CTS);
1351 icount->cts++;
1352 if ( status & MISCSTATUS_CTS )
1353 info->input_signal_events.cts_up++;
1354 else
1355 info->input_signal_events.cts_down++;
1356 }
1357 wake_up_interruptible(&info->status_event_wait_q);
1358 wake_up_interruptible(&info->event_wait_q);
1359
1360 if ( (info->flags & ASYNC_CHECK_CD) &&
1361 (status & MISCSTATUS_DCD_LATCHED) ) {
1362 if ( debug_level >= DEBUG_LEVEL_ISR )
1363 printk("%s CD now %s...", info->device_name,
1364 (status & MISCSTATUS_DCD) ? "on" : "off");
1365 if (status & MISCSTATUS_DCD)
1366 wake_up_interruptible(&info->open_wait);
1367 else {
1368 if ( debug_level >= DEBUG_LEVEL_ISR )
1369 printk("doing serial hangup...");
1370 if (info->tty)
1371 tty_hangup(info->tty);
1372 }
1373 }
1374
1375 if ( (info->flags & ASYNC_CTS_FLOW) &&
1376 (status & MISCSTATUS_CTS_LATCHED) ) {
1377 if (info->tty->hw_stopped) {
1378 if (status & MISCSTATUS_CTS) {
1379 if ( debug_level >= DEBUG_LEVEL_ISR )
1380 printk("CTS tx start...");
1381 if (info->tty)
1382 info->tty->hw_stopped = 0;
1383 usc_start_transmitter(info);
1384 info->pending_bh |= BH_TRANSMIT;
1385 return;
1386 }
1387 } else {
1388 if (!(status & MISCSTATUS_CTS)) {
1389 if ( debug_level >= DEBUG_LEVEL_ISR )
1390 printk("CTS tx stop...");
1391 if (info->tty)
1392 info->tty->hw_stopped = 1;
1393 usc_stop_transmitter(info);
1394 }
1395 }
1396 }
1397 }
1398
1399 info->pending_bh |= BH_STATUS;
1400
1401 /* for diagnostics set IRQ flag */
1402 if ( status & MISCSTATUS_TXC_LATCHED ){
1403 usc_OutReg( info, SICR,
1404 (unsigned short)(usc_InReg(info,SICR) & ~(SICR_TXC_ACTIVE+SICR_TXC_INACTIVE)) );
1405 usc_UnlatchIostatusBits( info, MISCSTATUS_TXC_LATCHED );
1406 info->irq_occurred = 1;
1407 }
1408
1409 } /* end of mgsl_isr_io_pin() */
1410
1411 /* mgsl_isr_transmit_data()
1412 *
1413 * Service a transmit data interrupt (async mode only).
1414 *
1415 * Arguments: info pointer to device instance data
1416 * Return Value: None
1417 */
1418 static void mgsl_isr_transmit_data( struct mgsl_struct *info )
1419 {
1420 if ( debug_level >= DEBUG_LEVEL_ISR )
1421 printk("%s(%d):mgsl_isr_transmit_data xmit_cnt=%d\n",
1422 __FILE__,__LINE__,info->xmit_cnt);
1423
1424 usc_ClearIrqPendingBits( info, TRANSMIT_DATA );
1425
1426 if (info->tty->stopped || info->tty->hw_stopped) {
1427 usc_stop_transmitter(info);
1428 return;
1429 }
1430
1431 if ( info->xmit_cnt )
1432 usc_load_txfifo( info );
1433 else
1434 info->tx_active = 0;
1435
1436 if (info->xmit_cnt < WAKEUP_CHARS)
1437 info->pending_bh |= BH_TRANSMIT;
1438
1439 } /* end of mgsl_isr_transmit_data() */
1440
1441 /* mgsl_isr_receive_data()
1442 *
1443 * Service a receive data interrupt. This occurs
1444 * when operating in asynchronous interrupt transfer mode.
1445 * The receive data FIFO is flushed to the receive data buffers.
1446 *
1447 * Arguments: info pointer to device instance data
1448 * Return Value: None
1449 */
1450 static void mgsl_isr_receive_data( struct mgsl_struct *info )
1451 {
1452 int Fifocount;
1453 u16 status;
1454 int work = 0;
1455 unsigned char DataByte;
1456 struct tty_struct *tty = info->tty;
1457 struct mgsl_icount *icount = &info->icount;
1458
1459 if ( debug_level >= DEBUG_LEVEL_ISR )
1460 printk("%s(%d):mgsl_isr_receive_data\n",
1461 __FILE__,__LINE__);
1462
1463 usc_ClearIrqPendingBits( info, RECEIVE_DATA );
1464
1465 /* select FIFO status for RICR readback */
1466 usc_RCmd( info, RCmd_SelectRicrRxFifostatus );
1467
1468 /* clear the Wordstatus bit so that status readback */
1469 /* only reflects the status of this byte */
1470 usc_OutReg( info, RICR+LSBONLY, (u16)(usc_InReg(info, RICR+LSBONLY) & ~BIT3 ));
1471
1472 /* flush the receive FIFO */
1473
1474 while( (Fifocount = (usc_InReg(info,RICR) >> 8)) ) {
1475 int flag;
1476
1477 /* read one byte from RxFIFO */
1478 outw( (inw(info->io_base + CCAR) & 0x0780) | (RDR+LSBONLY),
1479 info->io_base + CCAR );
1480 DataByte = inb( info->io_base + CCAR );
1481
1482 /* get the status of the received byte */
1483 status = usc_InReg(info, RCSR);
1484 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1485 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) )
1486 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
1487
1488 icount->rx++;
1489
1490 flag = 0;
1491 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1492 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) ) {
1493 printk("rxerr=%04X\n",status);
1494 /* update error statistics */
1495 if ( status & RXSTATUS_BREAK_RECEIVED ) {
1496 status &= ~(RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR);
1497 icount->brk++;
1498 } else if (status & RXSTATUS_PARITY_ERROR)
1499 icount->parity++;
1500 else if (status & RXSTATUS_FRAMING_ERROR)
1501 icount->frame++;
1502 else if (status & RXSTATUS_OVERRUN) {
1503 /* must issue purge fifo cmd before */
1504 /* 16C32 accepts more receive chars */
1505 usc_RTCmd(info,RTCmd_PurgeRxFifo);
1506 icount->overrun++;
1507 }
1508
1509 /* discard char if tty control flags say so */
1510 if (status & info->ignore_status_mask)
1511 continue;
1512
1513 status &= info->read_status_mask;
1514
1515 if (status & RXSTATUS_BREAK_RECEIVED) {
1516 flag = TTY_BREAK;
1517 if (info->flags & ASYNC_SAK)
1518 do_SAK(tty);
1519 } else if (status & RXSTATUS_PARITY_ERROR)
1520 flag = TTY_PARITY;
1521 else if (status & RXSTATUS_FRAMING_ERROR)
1522 flag = TTY_FRAME;
1523 } /* end of if (error) */
1524 tty_insert_flip_char(tty, DataByte, flag);
1525 if (status & RXSTATUS_OVERRUN) {
1526 /* Overrun is special, since it's
1527 * reported immediately, and doesn't
1528 * affect the current character
1529 */
1530 work += tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1531 }
1532 }
1533
1534 if ( debug_level >= DEBUG_LEVEL_ISR ) {
1535 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
1536 __FILE__,__LINE__,icount->rx,icount->brk,
1537 icount->parity,icount->frame,icount->overrun);
1538 }
1539
1540 if(work)
1541 tty_flip_buffer_push(tty);
1542 }
1543
1544 /* mgsl_isr_misc()
1545 *
1546 * Service a miscellaneous interrupt source.
1547 *
1548 * Arguments: info pointer to device extension (instance data)
1549 * Return Value: None
1550 */
1551 static void mgsl_isr_misc( struct mgsl_struct *info )
1552 {
1553 u16 status = usc_InReg( info, MISR );
1554
1555 if ( debug_level >= DEBUG_LEVEL_ISR )
1556 printk("%s(%d):mgsl_isr_misc status=%04X\n",
1557 __FILE__,__LINE__,status);
1558
1559 if ((status & MISCSTATUS_RCC_UNDERRUN) &&
1560 (info->params.mode == MGSL_MODE_HDLC)) {
1561
1562 /* turn off receiver and rx DMA */
1563 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
1564 usc_DmaCmd(info, DmaCmd_ResetRxChannel);
1565 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
1566 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
1567 usc_DisableInterrupts(info, RECEIVE_DATA + RECEIVE_STATUS);
1568
1569 /* schedule BH handler to restart receiver */
1570 info->pending_bh |= BH_RECEIVE;
1571 info->rx_rcc_underrun = 1;
1572 }
1573
1574 usc_ClearIrqPendingBits( info, MISC );
1575 usc_UnlatchMiscstatusBits( info, status );
1576
1577 } /* end of mgsl_isr_misc() */
1578
1579 /* mgsl_isr_null()
1580 *
1581 * Services undefined interrupt vectors from the
1582 * USC. (hence this function SHOULD never be called)
1583 *
1584 * Arguments: info pointer to device extension (instance data)
1585 * Return Value: None
1586 */
1587 static void mgsl_isr_null( struct mgsl_struct *info )
1588 {
1589
1590 } /* end of mgsl_isr_null() */
1591
1592 /* mgsl_isr_receive_dma()
1593 *
1594 * Service a receive DMA channel interrupt.
1595 * For this driver there are two sources of receive DMA interrupts
1596 * as identified in the Receive DMA mode Register (RDMR):
1597 *
1598 * BIT3 EOA/EOL End of List, all receive buffers in receive
1599 * buffer list have been filled (no more free buffers
1600 * available). The DMA controller has shut down.
1601 *
1602 * BIT2 EOB End of Buffer. This interrupt occurs when a receive
1603 * DMA buffer is terminated in response to completion
1604 * of a good frame or a frame with errors. The status
1605 * of the frame is stored in the buffer entry in the
1606 * list of receive buffer entries.
1607 *
1608 * Arguments: info pointer to device instance data
1609 * Return Value: None
1610 */
1611 static void mgsl_isr_receive_dma( struct mgsl_struct *info )
1612 {
1613 u16 status;
1614
1615 /* clear interrupt pending and IUS bit for Rx DMA IRQ */
1616 usc_OutDmaReg( info, CDIR, BIT9+BIT1 );
1617
1618 /* Read the receive DMA status to identify interrupt type. */
1619 /* This also clears the status bits. */
1620 status = usc_InDmaReg( info, RDMR );
1621
1622 if ( debug_level >= DEBUG_LEVEL_ISR )
1623 printk("%s(%d):mgsl_isr_receive_dma(%s) status=%04X\n",
1624 __FILE__,__LINE__,info->device_name,status);
1625
1626 info->pending_bh |= BH_RECEIVE;
1627
1628 if ( status & BIT3 ) {
1629 info->rx_overflow = 1;
1630 info->icount.buf_overrun++;
1631 }
1632
1633 } /* end of mgsl_isr_receive_dma() */
1634
1635 /* mgsl_isr_transmit_dma()
1636 *
1637 * This function services a transmit DMA channel interrupt.
1638 *
1639 * For this driver there is one source of transmit DMA interrupts
1640 * as identified in the Transmit DMA Mode Register (TDMR):
1641 *
1642 * BIT2 EOB End of Buffer. This interrupt occurs when a
1643 * transmit DMA buffer has been emptied.
1644 *
1645 * The driver maintains enough transmit DMA buffers to hold at least
1646 * one max frame size transmit frame. When operating in a buffered
1647 * transmit mode, there may be enough transmit DMA buffers to hold at
1648 * least two or more max frame size frames. On an EOB condition,
1649 * determine if there are any queued transmit buffers and copy into
1650 * transmit DMA buffers if we have room.
1651 *
1652 * Arguments: info pointer to device instance data
1653 * Return Value: None
1654 */
1655 static void mgsl_isr_transmit_dma( struct mgsl_struct *info )
1656 {
1657 u16 status;
1658
1659 /* clear interrupt pending and IUS bit for Tx DMA IRQ */
1660 usc_OutDmaReg(info, CDIR, BIT8+BIT0 );
1661
1662 /* Read the transmit DMA status to identify interrupt type. */
1663 /* This also clears the status bits. */
1664
1665 status = usc_InDmaReg( info, TDMR );
1666
1667 if ( debug_level >= DEBUG_LEVEL_ISR )
1668 printk("%s(%d):mgsl_isr_transmit_dma(%s) status=%04X\n",
1669 __FILE__,__LINE__,info->device_name,status);
1670
1671 if ( status & BIT2 ) {
1672 --info->tx_dma_buffers_used;
1673
1674 /* if there are transmit frames queued,
1675 * try to load the next one
1676 */
1677 if ( load_next_tx_holding_buffer(info) ) {
1678 /* if call returns non-zero value, we have
1679 * at least one free tx holding buffer
1680 */
1681 info->pending_bh |= BH_TRANSMIT;
1682 }
1683 }
1684
1685 } /* end of mgsl_isr_transmit_dma() */
1686
1687 /* mgsl_interrupt()
1688 *
1689 * Interrupt service routine entry point.
1690 *
1691 * Arguments:
1692 *
1693 * irq interrupt number that caused interrupt
1694 * dev_id device ID supplied during interrupt registration
1695 *
1696 * Return Value: None
1697 */
1698 static irqreturn_t mgsl_interrupt(int irq, void *dev_id)
1699 {
1700 struct mgsl_struct * info;
1701 u16 UscVector;
1702 u16 DmaVector;
1703
1704 if ( debug_level >= DEBUG_LEVEL_ISR )
1705 printk("%s(%d):mgsl_interrupt(%d)entry.\n",
1706 __FILE__,__LINE__,irq);
1707
1708 info = (struct mgsl_struct *)dev_id;
1709 if (!info)
1710 return IRQ_NONE;
1711
1712 spin_lock(&info->irq_spinlock);
1713
1714 for(;;) {
1715 /* Read the interrupt vectors from hardware. */
1716 UscVector = usc_InReg(info, IVR) >> 9;
1717 DmaVector = usc_InDmaReg(info, DIVR);
1718
1719 if ( debug_level >= DEBUG_LEVEL_ISR )
1720 printk("%s(%d):%s UscVector=%08X DmaVector=%08X\n",
1721 __FILE__,__LINE__,info->device_name,UscVector,DmaVector);
1722
1723 if ( !UscVector && !DmaVector )
1724 break;
1725
1726 /* Dispatch interrupt vector */
1727 if ( UscVector )
1728 (*UscIsrTable[UscVector])(info);
1729 else if ( (DmaVector&(BIT10|BIT9)) == BIT10)
1730 mgsl_isr_transmit_dma(info);
1731 else
1732 mgsl_isr_receive_dma(info);
1733
1734 if ( info->isr_overflow ) {
1735 printk(KERN_ERR"%s(%d):%s isr overflow irq=%d\n",
1736 __FILE__,__LINE__,info->device_name, irq);
1737 usc_DisableMasterIrqBit(info);
1738 usc_DisableDmaInterrupts(info,DICR_MASTER);
1739 break;
1740 }
1741 }
1742
1743 /* Request bottom half processing if there's something
1744 * for it to do and the bh is not already running
1745 */
1746
1747 if ( info->pending_bh && !info->bh_running && !info->bh_requested ) {
1748 if ( debug_level >= DEBUG_LEVEL_ISR )
1749 printk("%s(%d):%s queueing bh task.\n",
1750 __FILE__,__LINE__,info->device_name);
1751 schedule_work(&info->task);
1752 info->bh_requested = 1;
1753 }
1754
1755 spin_unlock(&info->irq_spinlock);
1756
1757 if ( debug_level >= DEBUG_LEVEL_ISR )
1758 printk("%s(%d):mgsl_interrupt(%d)exit.\n",
1759 __FILE__,__LINE__,irq);
1760 return IRQ_HANDLED;
1761 } /* end of mgsl_interrupt() */
1762
1763 /* startup()
1764 *
1765 * Initialize and start device.
1766 *
1767 * Arguments: info pointer to device instance data
1768 * Return Value: 0 if success, otherwise error code
1769 */
1770 static int startup(struct mgsl_struct * info)
1771 {
1772 int retval = 0;
1773
1774 if ( debug_level >= DEBUG_LEVEL_INFO )
1775 printk("%s(%d):mgsl_startup(%s)\n",__FILE__,__LINE__,info->device_name);
1776
1777 if (info->flags & ASYNC_INITIALIZED)
1778 return 0;
1779
1780 if (!info->xmit_buf) {
1781 /* allocate a page of memory for a transmit buffer */
1782 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1783 if (!info->xmit_buf) {
1784 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1785 __FILE__,__LINE__,info->device_name);
1786 return -ENOMEM;
1787 }
1788 }
1789
1790 info->pending_bh = 0;
1791
1792 memset(&info->icount, 0, sizeof(info->icount));
1793
1794 setup_timer(&info->tx_timer, mgsl_tx_timeout, (unsigned long)info);
1795
1796 /* Allocate and claim adapter resources */
1797 retval = mgsl_claim_resources(info);
1798
1799 /* perform existence check and diagnostics */
1800 if ( !retval )
1801 retval = mgsl_adapter_test(info);
1802
1803 if ( retval ) {
1804 if (capable(CAP_SYS_ADMIN) && info->tty)
1805 set_bit(TTY_IO_ERROR, &info->tty->flags);
1806 mgsl_release_resources(info);
1807 return retval;
1808 }
1809
1810 /* program hardware for current parameters */
1811 mgsl_change_params(info);
1812
1813 if (info->tty)
1814 clear_bit(TTY_IO_ERROR, &info->tty->flags);
1815
1816 info->flags |= ASYNC_INITIALIZED;
1817
1818 return 0;
1819
1820 } /* end of startup() */
1821
1822 /* shutdown()
1823 *
1824 * Called by mgsl_close() and mgsl_hangup() to shutdown hardware
1825 *
1826 * Arguments: info pointer to device instance data
1827 * Return Value: None
1828 */
1829 static void shutdown(struct mgsl_struct * info)
1830 {
1831 unsigned long flags;
1832
1833 if (!(info->flags & ASYNC_INITIALIZED))
1834 return;
1835
1836 if (debug_level >= DEBUG_LEVEL_INFO)
1837 printk("%s(%d):mgsl_shutdown(%s)\n",
1838 __FILE__,__LINE__, info->device_name );
1839
1840 /* clear status wait queue because status changes */
1841 /* can't happen after shutting down the hardware */
1842 wake_up_interruptible(&info->status_event_wait_q);
1843 wake_up_interruptible(&info->event_wait_q);
1844
1845 del_timer_sync(&info->tx_timer);
1846
1847 if (info->xmit_buf) {
1848 free_page((unsigned long) info->xmit_buf);
1849 info->xmit_buf = NULL;
1850 }
1851
1852 spin_lock_irqsave(&info->irq_spinlock,flags);
1853 usc_DisableMasterIrqBit(info);
1854 usc_stop_receiver(info);
1855 usc_stop_transmitter(info);
1856 usc_DisableInterrupts(info,RECEIVE_DATA + RECEIVE_STATUS +
1857 TRANSMIT_DATA + TRANSMIT_STATUS + IO_PIN + MISC );
1858 usc_DisableDmaInterrupts(info,DICR_MASTER + DICR_TRANSMIT + DICR_RECEIVE);
1859
1860 /* Disable DMAEN (Port 7, Bit 14) */
1861 /* This disconnects the DMA request signal from the ISA bus */
1862 /* on the ISA adapter. This has no effect for the PCI adapter */
1863 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) | BIT14));
1864
1865 /* Disable INTEN (Port 6, Bit12) */
1866 /* This disconnects the IRQ request signal to the ISA bus */
1867 /* on the ISA adapter. This has no effect for the PCI adapter */
1868 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) | BIT12));
1869
1870 if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
1871 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1872 usc_set_serial_signals(info);
1873 }
1874
1875 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1876
1877 mgsl_release_resources(info);
1878
1879 if (info->tty)
1880 set_bit(TTY_IO_ERROR, &info->tty->flags);
1881
1882 info->flags &= ~ASYNC_INITIALIZED;
1883
1884 } /* end of shutdown() */
1885
1886 static void mgsl_program_hw(struct mgsl_struct *info)
1887 {
1888 unsigned long flags;
1889
1890 spin_lock_irqsave(&info->irq_spinlock,flags);
1891
1892 usc_stop_receiver(info);
1893 usc_stop_transmitter(info);
1894 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1895
1896 if (info->params.mode == MGSL_MODE_HDLC ||
1897 info->params.mode == MGSL_MODE_RAW ||
1898 info->netcount)
1899 usc_set_sync_mode(info);
1900 else
1901 usc_set_async_mode(info);
1902
1903 usc_set_serial_signals(info);
1904
1905 info->dcd_chkcount = 0;
1906 info->cts_chkcount = 0;
1907 info->ri_chkcount = 0;
1908 info->dsr_chkcount = 0;
1909
1910 usc_EnableStatusIrqs(info,SICR_CTS+SICR_DSR+SICR_DCD+SICR_RI);
1911 usc_EnableInterrupts(info, IO_PIN);
1912 usc_get_serial_signals(info);
1913
1914 if (info->netcount || info->tty->termios->c_cflag & CREAD)
1915 usc_start_receiver(info);
1916
1917 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1918 }
1919
1920 /* Reconfigure adapter based on new parameters
1921 */
1922 static void mgsl_change_params(struct mgsl_struct *info)
1923 {
1924 unsigned cflag;
1925 int bits_per_char;
1926
1927 if (!info->tty || !info->tty->termios)
1928 return;
1929
1930 if (debug_level >= DEBUG_LEVEL_INFO)
1931 printk("%s(%d):mgsl_change_params(%s)\n",
1932 __FILE__,__LINE__, info->device_name );
1933
1934 cflag = info->tty->termios->c_cflag;
1935
1936 /* if B0 rate (hangup) specified then negate DTR and RTS */
1937 /* otherwise assert DTR and RTS */
1938 if (cflag & CBAUD)
1939 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1940 else
1941 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1942
1943 /* byte size and parity */
1944
1945 switch (cflag & CSIZE) {
1946 case CS5: info->params.data_bits = 5; break;
1947 case CS6: info->params.data_bits = 6; break;
1948 case CS7: info->params.data_bits = 7; break;
1949 case CS8: info->params.data_bits = 8; break;
1950 /* Never happens, but GCC is too dumb to figure it out */
1951 default: info->params.data_bits = 7; break;
1952 }
1953
1954 if (cflag & CSTOPB)
1955 info->params.stop_bits = 2;
1956 else
1957 info->params.stop_bits = 1;
1958
1959 info->params.parity = ASYNC_PARITY_NONE;
1960 if (cflag & PARENB) {
1961 if (cflag & PARODD)
1962 info->params.parity = ASYNC_PARITY_ODD;
1963 else
1964 info->params.parity = ASYNC_PARITY_EVEN;
1965 #ifdef CMSPAR
1966 if (cflag & CMSPAR)
1967 info->params.parity = ASYNC_PARITY_SPACE;
1968 #endif
1969 }
1970
1971 /* calculate number of jiffies to transmit a full
1972 * FIFO (32 bytes) at specified data rate
1973 */
1974 bits_per_char = info->params.data_bits +
1975 info->params.stop_bits + 1;
1976
1977 /* if port data rate is set to 460800 or less then
1978 * allow tty settings to override, otherwise keep the
1979 * current data rate.
1980 */
1981 if (info->params.data_rate <= 460800)
1982 info->params.data_rate = tty_get_baud_rate(info->tty);
1983
1984 if ( info->params.data_rate ) {
1985 info->timeout = (32*HZ*bits_per_char) /
1986 info->params.data_rate;
1987 }
1988 info->timeout += HZ/50; /* Add .02 seconds of slop */
1989
1990 if (cflag & CRTSCTS)
1991 info->flags |= ASYNC_CTS_FLOW;
1992 else
1993 info->flags &= ~ASYNC_CTS_FLOW;
1994
1995 if (cflag & CLOCAL)
1996 info->flags &= ~ASYNC_CHECK_CD;
1997 else
1998 info->flags |= ASYNC_CHECK_CD;
1999
2000 /* process tty input control flags */
2001
2002 info->read_status_mask = RXSTATUS_OVERRUN;
2003 if (I_INPCK(info->tty))
2004 info->read_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
2005 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2006 info->read_status_mask |= RXSTATUS_BREAK_RECEIVED;
2007
2008 if (I_IGNPAR(info->tty))
2009 info->ignore_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
2010 if (I_IGNBRK(info->tty)) {
2011 info->ignore_status_mask |= RXSTATUS_BREAK_RECEIVED;
2012 /* If ignoring parity and break indicators, ignore
2013 * overruns too. (For real raw support).
2014 */
2015 if (I_IGNPAR(info->tty))
2016 info->ignore_status_mask |= RXSTATUS_OVERRUN;
2017 }
2018
2019 mgsl_program_hw(info);
2020
2021 } /* end of mgsl_change_params() */
2022
2023 /* mgsl_put_char()
2024 *
2025 * Add a character to the transmit buffer.
2026 *
2027 * Arguments: tty pointer to tty information structure
2028 * ch character to add to transmit buffer
2029 *
2030 * Return Value: None
2031 */
2032 static void mgsl_put_char(struct tty_struct *tty, unsigned char ch)
2033 {
2034 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2035 unsigned long flags;
2036
2037 if ( debug_level >= DEBUG_LEVEL_INFO ) {
2038 printk( "%s(%d):mgsl_put_char(%d) on %s\n",
2039 __FILE__,__LINE__,ch,info->device_name);
2040 }
2041
2042 if (mgsl_paranoia_check(info, tty->name, "mgsl_put_char"))
2043 return;
2044
2045 if (!tty || !info->xmit_buf)
2046 return;
2047
2048 spin_lock_irqsave(&info->irq_spinlock,flags);
2049
2050 if ( (info->params.mode == MGSL_MODE_ASYNC ) || !info->tx_active ) {
2051
2052 if (info->xmit_cnt < SERIAL_XMIT_SIZE - 1) {
2053 info->xmit_buf[info->xmit_head++] = ch;
2054 info->xmit_head &= SERIAL_XMIT_SIZE-1;
2055 info->xmit_cnt++;
2056 }
2057 }
2058
2059 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2060
2061 } /* end of mgsl_put_char() */
2062
2063 /* mgsl_flush_chars()
2064 *
2065 * Enable transmitter so remaining characters in the
2066 * transmit buffer are sent.
2067 *
2068 * Arguments: tty pointer to tty information structure
2069 * Return Value: None
2070 */
2071 static void mgsl_flush_chars(struct tty_struct *tty)
2072 {
2073 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2074 unsigned long flags;
2075
2076 if ( debug_level >= DEBUG_LEVEL_INFO )
2077 printk( "%s(%d):mgsl_flush_chars() entry on %s xmit_cnt=%d\n",
2078 __FILE__,__LINE__,info->device_name,info->xmit_cnt);
2079
2080 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_chars"))
2081 return;
2082
2083 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
2084 !info->xmit_buf)
2085 return;
2086
2087 if ( debug_level >= DEBUG_LEVEL_INFO )
2088 printk( "%s(%d):mgsl_flush_chars() entry on %s starting transmitter\n",
2089 __FILE__,__LINE__,info->device_name );
2090
2091 spin_lock_irqsave(&info->irq_spinlock,flags);
2092
2093 if (!info->tx_active) {
2094 if ( (info->params.mode == MGSL_MODE_HDLC ||
2095 info->params.mode == MGSL_MODE_RAW) && info->xmit_cnt ) {
2096 /* operating in synchronous (frame oriented) mode */
2097 /* copy data from circular xmit_buf to */
2098 /* transmit DMA buffer. */
2099 mgsl_load_tx_dma_buffer(info,
2100 info->xmit_buf,info->xmit_cnt);
2101 }
2102 usc_start_transmitter(info);
2103 }
2104
2105 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2106
2107 } /* end of mgsl_flush_chars() */
2108
2109 /* mgsl_write()
2110 *
2111 * Send a block of data
2112 *
2113 * Arguments:
2114 *
2115 * tty pointer to tty information structure
2116 * buf pointer to buffer containing send data
2117 * count size of send data in bytes
2118 *
2119 * Return Value: number of characters written
2120 */
2121 static int mgsl_write(struct tty_struct * tty,
2122 const unsigned char *buf, int count)
2123 {
2124 int c, ret = 0;
2125 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2126 unsigned long flags;
2127
2128 if ( debug_level >= DEBUG_LEVEL_INFO )
2129 printk( "%s(%d):mgsl_write(%s) count=%d\n",
2130 __FILE__,__LINE__,info->device_name,count);
2131
2132 if (mgsl_paranoia_check(info, tty->name, "mgsl_write"))
2133 goto cleanup;
2134
2135 if (!tty || !info->xmit_buf)
2136 goto cleanup;
2137
2138 if ( info->params.mode == MGSL_MODE_HDLC ||
2139 info->params.mode == MGSL_MODE_RAW ) {
2140 /* operating in synchronous (frame oriented) mode */
2141 /* operating in synchronous (frame oriented) mode */
2142 if (info->tx_active) {
2143
2144 if ( info->params.mode == MGSL_MODE_HDLC ) {
2145 ret = 0;
2146 goto cleanup;
2147 }
2148 /* transmitter is actively sending data -
2149 * if we have multiple transmit dma and
2150 * holding buffers, attempt to queue this
2151 * frame for transmission at a later time.
2152 */
2153 if (info->tx_holding_count >= info->num_tx_holding_buffers ) {
2154 /* no tx holding buffers available */
2155 ret = 0;
2156 goto cleanup;
2157 }
2158
2159 /* queue transmit frame request */
2160 ret = count;
2161 save_tx_buffer_request(info,buf,count);
2162
2163 /* if we have sufficient tx dma buffers,
2164 * load the next buffered tx request
2165 */
2166 spin_lock_irqsave(&info->irq_spinlock,flags);
2167 load_next_tx_holding_buffer(info);
2168 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2169 goto cleanup;
2170 }
2171
2172 /* if operating in HDLC LoopMode and the adapter */
2173 /* has yet to be inserted into the loop, we can't */
2174 /* transmit */
2175
2176 if ( (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) &&
2177 !usc_loopmode_active(info) )
2178 {
2179 ret = 0;
2180 goto cleanup;
2181 }
2182
2183 if ( info->xmit_cnt ) {
2184 /* Send accumulated from send_char() calls */
2185 /* as frame and wait before accepting more data. */
2186 ret = 0;
2187
2188 /* copy data from circular xmit_buf to */
2189 /* transmit DMA buffer. */
2190 mgsl_load_tx_dma_buffer(info,
2191 info->xmit_buf,info->xmit_cnt);
2192 if ( debug_level >= DEBUG_LEVEL_INFO )
2193 printk( "%s(%d):mgsl_write(%s) sync xmit_cnt flushing\n",
2194 __FILE__,__LINE__,info->device_name);
2195 } else {
2196 if ( debug_level >= DEBUG_LEVEL_INFO )
2197 printk( "%s(%d):mgsl_write(%s) sync transmit accepted\n",
2198 __FILE__,__LINE__,info->device_name);
2199 ret = count;
2200 info->xmit_cnt = count;
2201 mgsl_load_tx_dma_buffer(info,buf,count);
2202 }
2203 } else {
2204 while (1) {
2205 spin_lock_irqsave(&info->irq_spinlock,flags);
2206 c = min_t(int, count,
2207 min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
2208 SERIAL_XMIT_SIZE - info->xmit_head));
2209 if (c <= 0) {
2210 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2211 break;
2212 }
2213 memcpy(info->xmit_buf + info->xmit_head, buf, c);
2214 info->xmit_head = ((info->xmit_head + c) &
2215 (SERIAL_XMIT_SIZE-1));
2216 info->xmit_cnt += c;
2217 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2218 buf += c;
2219 count -= c;
2220 ret += c;
2221 }
2222 }
2223
2224 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
2225 spin_lock_irqsave(&info->irq_spinlock,flags);
2226 if (!info->tx_active)
2227 usc_start_transmitter(info);
2228 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2229 }
2230 cleanup:
2231 if ( debug_level >= DEBUG_LEVEL_INFO )
2232 printk( "%s(%d):mgsl_write(%s) returning=%d\n",
2233 __FILE__,__LINE__,info->device_name,ret);
2234
2235 return ret;
2236
2237 } /* end of mgsl_write() */
2238
2239 /* mgsl_write_room()
2240 *
2241 * Return the count of free bytes in transmit buffer
2242 *
2243 * Arguments: tty pointer to tty info structure
2244 * Return Value: None
2245 */
2246 static int mgsl_write_room(struct tty_struct *tty)
2247 {
2248 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2249 int ret;
2250
2251 if (mgsl_paranoia_check(info, tty->name, "mgsl_write_room"))
2252 return 0;
2253 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
2254 if (ret < 0)
2255 ret = 0;
2256
2257 if (debug_level >= DEBUG_LEVEL_INFO)
2258 printk("%s(%d):mgsl_write_room(%s)=%d\n",
2259 __FILE__,__LINE__, info->device_name,ret );
2260
2261 if ( info->params.mode == MGSL_MODE_HDLC ||
2262 info->params.mode == MGSL_MODE_RAW ) {
2263 /* operating in synchronous (frame oriented) mode */
2264 if ( info->tx_active )
2265 return 0;
2266 else
2267 return HDLC_MAX_FRAME_SIZE;
2268 }
2269
2270 return ret;
2271
2272 } /* end of mgsl_write_room() */
2273
2274 /* mgsl_chars_in_buffer()
2275 *
2276 * Return the count of bytes in transmit buffer
2277 *
2278 * Arguments: tty pointer to tty info structure
2279 * Return Value: None
2280 */
2281 static int mgsl_chars_in_buffer(struct tty_struct *tty)
2282 {
2283 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2284
2285 if (debug_level >= DEBUG_LEVEL_INFO)
2286 printk("%s(%d):mgsl_chars_in_buffer(%s)\n",
2287 __FILE__,__LINE__, info->device_name );
2288
2289 if (mgsl_paranoia_check(info, tty->name, "mgsl_chars_in_buffer"))
2290 return 0;
2291
2292 if (debug_level >= DEBUG_LEVEL_INFO)
2293 printk("%s(%d):mgsl_chars_in_buffer(%s)=%d\n",
2294 __FILE__,__LINE__, info->device_name,info->xmit_cnt );
2295
2296 if ( info->params.mode == MGSL_MODE_HDLC ||
2297 info->params.mode == MGSL_MODE_RAW ) {
2298 /* operating in synchronous (frame oriented) mode */
2299 if ( info->tx_active )
2300 return info->max_frame_size;
2301 else
2302 return 0;
2303 }
2304
2305 return info->xmit_cnt;
2306 } /* end of mgsl_chars_in_buffer() */
2307
2308 /* mgsl_flush_buffer()
2309 *
2310 * Discard all data in the send buffer
2311 *
2312 * Arguments: tty pointer to tty info structure
2313 * Return Value: None
2314 */
2315 static void mgsl_flush_buffer(struct tty_struct *tty)
2316 {
2317 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2318 unsigned long flags;
2319
2320 if (debug_level >= DEBUG_LEVEL_INFO)
2321 printk("%s(%d):mgsl_flush_buffer(%s) entry\n",
2322 __FILE__,__LINE__, info->device_name );
2323
2324 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_buffer"))
2325 return;
2326
2327 spin_lock_irqsave(&info->irq_spinlock,flags);
2328 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
2329 del_timer(&info->tx_timer);
2330 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2331
2332 tty_wakeup(tty);
2333 }
2334
2335 /* mgsl_send_xchar()
2336 *
2337 * Send a high-priority XON/XOFF character
2338 *
2339 * Arguments: tty pointer to tty info structure
2340 * ch character to send
2341 * Return Value: None
2342 */
2343 static void mgsl_send_xchar(struct tty_struct *tty, char ch)
2344 {
2345 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2346 unsigned long flags;
2347
2348 if (debug_level >= DEBUG_LEVEL_INFO)
2349 printk("%s(%d):mgsl_send_xchar(%s,%d)\n",
2350 __FILE__,__LINE__, info->device_name, ch );
2351
2352 if (mgsl_paranoia_check(info, tty->name, "mgsl_send_xchar"))
2353 return;
2354
2355 info->x_char = ch;
2356 if (ch) {
2357 /* Make sure transmit interrupts are on */
2358 spin_lock_irqsave(&info->irq_spinlock,flags);
2359 if (!info->tx_enabled)
2360 usc_start_transmitter(info);
2361 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2362 }
2363 } /* end of mgsl_send_xchar() */
2364
2365 /* mgsl_throttle()
2366 *
2367 * Signal remote device to throttle send data (our receive data)
2368 *
2369 * Arguments: tty pointer to tty info structure
2370 * Return Value: None
2371 */
2372 static void mgsl_throttle(struct tty_struct * tty)
2373 {
2374 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2375 unsigned long flags;
2376
2377 if (debug_level >= DEBUG_LEVEL_INFO)
2378 printk("%s(%d):mgsl_throttle(%s) entry\n",
2379 __FILE__,__LINE__, info->device_name );
2380
2381 if (mgsl_paranoia_check(info, tty->name, "mgsl_throttle"))
2382 return;
2383
2384 if (I_IXOFF(tty))
2385 mgsl_send_xchar(tty, STOP_CHAR(tty));
2386
2387 if (tty->termios->c_cflag & CRTSCTS) {
2388 spin_lock_irqsave(&info->irq_spinlock,flags);
2389 info->serial_signals &= ~SerialSignal_RTS;
2390 usc_set_serial_signals(info);
2391 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2392 }
2393 } /* end of mgsl_throttle() */
2394
2395 /* mgsl_unthrottle()
2396 *
2397 * Signal remote device to stop throttling send data (our receive data)
2398 *
2399 * Arguments: tty pointer to tty info structure
2400 * Return Value: None
2401 */
2402 static void mgsl_unthrottle(struct tty_struct * tty)
2403 {
2404 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2405 unsigned long flags;
2406
2407 if (debug_level >= DEBUG_LEVEL_INFO)
2408 printk("%s(%d):mgsl_unthrottle(%s) entry\n",
2409 __FILE__,__LINE__, info->device_name );
2410
2411 if (mgsl_paranoia_check(info, tty->name, "mgsl_unthrottle"))
2412 return;
2413
2414 if (I_IXOFF(tty)) {
2415 if (info->x_char)
2416 info->x_char = 0;
2417 else
2418 mgsl_send_xchar(tty, START_CHAR(tty));
2419 }
2420
2421 if (tty->termios->c_cflag & CRTSCTS) {
2422 spin_lock_irqsave(&info->irq_spinlock,flags);
2423 info->serial_signals |= SerialSignal_RTS;
2424 usc_set_serial_signals(info);
2425 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2426 }
2427
2428 } /* end of mgsl_unthrottle() */
2429
2430 /* mgsl_get_stats()
2431 *
2432 * get the current serial parameters information
2433 *
2434 * Arguments: info pointer to device instance data
2435 * user_icount pointer to buffer to hold returned stats
2436 *
2437 * Return Value: 0 if success, otherwise error code
2438 */
2439 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount __user *user_icount)
2440 {
2441 int err;
2442
2443 if (debug_level >= DEBUG_LEVEL_INFO)
2444 printk("%s(%d):mgsl_get_params(%s)\n",
2445 __FILE__,__LINE__, info->device_name);
2446
2447 if (!user_icount) {
2448 memset(&info->icount, 0, sizeof(info->icount));
2449 } else {
2450 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2451 if (err)
2452 return -EFAULT;
2453 }
2454
2455 return 0;
2456
2457 } /* end of mgsl_get_stats() */
2458
2459 /* mgsl_get_params()
2460 *
2461 * get the current serial parameters information
2462 *
2463 * Arguments: info pointer to device instance data
2464 * user_params pointer to buffer to hold returned params
2465 *
2466 * Return Value: 0 if success, otherwise error code
2467 */
2468 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params)
2469 {
2470 int err;
2471 if (debug_level >= DEBUG_LEVEL_INFO)
2472 printk("%s(%d):mgsl_get_params(%s)\n",
2473 __FILE__,__LINE__, info->device_name);
2474
2475 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2476 if (err) {
2477 if ( debug_level >= DEBUG_LEVEL_INFO )
2478 printk( "%s(%d):mgsl_get_params(%s) user buffer copy failed\n",
2479 __FILE__,__LINE__,info->device_name);
2480 return -EFAULT;
2481 }
2482
2483 return 0;
2484
2485 } /* end of mgsl_get_params() */
2486
2487 /* mgsl_set_params()
2488 *
2489 * set the serial parameters
2490 *
2491 * Arguments:
2492 *
2493 * info pointer to device instance data
2494 * new_params user buffer containing new serial params
2495 *
2496 * Return Value: 0 if success, otherwise error code
2497 */
2498 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params)
2499 {
2500 unsigned long flags;
2501 MGSL_PARAMS tmp_params;
2502 int err;
2503
2504 if (debug_level >= DEBUG_LEVEL_INFO)
2505 printk("%s(%d):mgsl_set_params %s\n", __FILE__,__LINE__,
2506 info->device_name );
2507 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2508 if (err) {
2509 if ( debug_level >= DEBUG_LEVEL_INFO )
2510 printk( "%s(%d):mgsl_set_params(%s) user buffer copy failed\n",
2511 __FILE__,__LINE__,info->device_name);
2512 return -EFAULT;
2513 }
2514
2515 spin_lock_irqsave(&info->irq_spinlock,flags);
2516 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2517 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2518
2519 mgsl_change_params(info);
2520
2521 return 0;
2522
2523 } /* end of mgsl_set_params() */
2524
2525 /* mgsl_get_txidle()
2526 *
2527 * get the current transmit idle mode
2528 *
2529 * Arguments: info pointer to device instance data
2530 * idle_mode pointer to buffer to hold returned idle mode
2531 *
2532 * Return Value: 0 if success, otherwise error code
2533 */
2534 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode)
2535 {
2536 int err;
2537
2538 if (debug_level >= DEBUG_LEVEL_INFO)
2539 printk("%s(%d):mgsl_get_txidle(%s)=%d\n",
2540 __FILE__,__LINE__, info->device_name, info->idle_mode);
2541
2542 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2543 if (err) {
2544 if ( debug_level >= DEBUG_LEVEL_INFO )
2545 printk( "%s(%d):mgsl_get_txidle(%s) user buffer copy failed\n",
2546 __FILE__,__LINE__,info->device_name);
2547 return -EFAULT;
2548 }
2549
2550 return 0;
2551
2552 } /* end of mgsl_get_txidle() */
2553
2554 /* mgsl_set_txidle() service ioctl to set transmit idle mode
2555 *
2556 * Arguments: info pointer to device instance data
2557 * idle_mode new idle mode
2558 *
2559 * Return Value: 0 if success, otherwise error code
2560 */
2561 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode)
2562 {
2563 unsigned long flags;
2564
2565 if (debug_level >= DEBUG_LEVEL_INFO)
2566 printk("%s(%d):mgsl_set_txidle(%s,%d)\n", __FILE__,__LINE__,
2567 info->device_name, idle_mode );
2568
2569 spin_lock_irqsave(&info->irq_spinlock,flags);
2570 info->idle_mode = idle_mode;
2571 usc_set_txidle( info );
2572 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2573 return 0;
2574
2575 } /* end of mgsl_set_txidle() */
2576
2577 /* mgsl_txenable()
2578 *
2579 * enable or disable the transmitter
2580 *
2581 * Arguments:
2582 *
2583 * info pointer to device instance data
2584 * enable 1 = enable, 0 = disable
2585 *
2586 * Return Value: 0 if success, otherwise error code
2587 */
2588 static int mgsl_txenable(struct mgsl_struct * info, int enable)
2589 {
2590 unsigned long flags;
2591
2592 if (debug_level >= DEBUG_LEVEL_INFO)
2593 printk("%s(%d):mgsl_txenable(%s,%d)\n", __FILE__,__LINE__,
2594 info->device_name, enable);
2595
2596 spin_lock_irqsave(&info->irq_spinlock,flags);
2597 if ( enable ) {
2598 if ( !info->tx_enabled ) {
2599
2600 usc_start_transmitter(info);
2601 /*--------------------------------------------------
2602 * if HDLC/SDLC Loop mode, attempt to insert the
2603 * station in the 'loop' by setting CMR:13. Upon
2604 * receipt of the next GoAhead (RxAbort) sequence,
2605 * the OnLoop indicator (CCSR:7) should go active
2606 * to indicate that we are on the loop
2607 *--------------------------------------------------*/
2608 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2609 usc_loopmode_insert_request( info );
2610 }
2611 } else {
2612 if ( info->tx_enabled )
2613 usc_stop_transmitter(info);
2614 }
2615 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2616 return 0;
2617
2618 } /* end of mgsl_txenable() */
2619
2620 /* mgsl_txabort() abort send HDLC frame
2621 *
2622 * Arguments: info pointer to device instance data
2623 * Return Value: 0 if success, otherwise error code
2624 */
2625 static int mgsl_txabort(struct mgsl_struct * info)
2626 {
2627 unsigned long flags;
2628
2629 if (debug_level >= DEBUG_LEVEL_INFO)
2630 printk("%s(%d):mgsl_txabort(%s)\n", __FILE__,__LINE__,
2631 info->device_name);
2632
2633 spin_lock_irqsave(&info->irq_spinlock,flags);
2634 if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC )
2635 {
2636 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2637 usc_loopmode_cancel_transmit( info );
2638 else
2639 usc_TCmd(info,TCmd_SendAbort);
2640 }
2641 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2642 return 0;
2643
2644 } /* end of mgsl_txabort() */
2645
2646 /* mgsl_rxenable() enable or disable the receiver
2647 *
2648 * Arguments: info pointer to device instance data
2649 * enable 1 = enable, 0 = disable
2650 * Return Value: 0 if success, otherwise error code
2651 */
2652 static int mgsl_rxenable(struct mgsl_struct * info, int enable)
2653 {
2654 unsigned long flags;
2655
2656 if (debug_level >= DEBUG_LEVEL_INFO)
2657 printk("%s(%d):mgsl_rxenable(%s,%d)\n", __FILE__,__LINE__,
2658 info->device_name, enable);
2659
2660 spin_lock_irqsave(&info->irq_spinlock,flags);
2661 if ( enable ) {
2662 if ( !info->rx_enabled )
2663 usc_start_receiver(info);
2664 } else {
2665 if ( info->rx_enabled )
2666 usc_stop_receiver(info);
2667 }
2668 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2669 return 0;
2670
2671 } /* end of mgsl_rxenable() */
2672
2673 /* mgsl_wait_event() wait for specified event to occur
2674 *
2675 * Arguments: info pointer to device instance data
2676 * mask pointer to bitmask of events to wait for
2677 * Return Value: 0 if successful and bit mask updated with
2678 * of events triggerred,
2679 * otherwise error code
2680 */
2681 static int mgsl_wait_event(struct mgsl_struct * info, int __user * mask_ptr)
2682 {
2683 unsigned long flags;
2684 int s;
2685 int rc=0;
2686 struct mgsl_icount cprev, cnow;
2687 int events;
2688 int mask;
2689 struct _input_signal_events oldsigs, newsigs;
2690 DECLARE_WAITQUEUE(wait, current);
2691
2692 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
2693 if (rc) {
2694 return -EFAULT;
2695 }
2696
2697 if (debug_level >= DEBUG_LEVEL_INFO)
2698 printk("%s(%d):mgsl_wait_event(%s,%d)\n", __FILE__,__LINE__,
2699 info->device_name, mask);
2700
2701 spin_lock_irqsave(&info->irq_spinlock,flags);
2702
2703 /* return immediately if state matches requested events */
2704 usc_get_serial_signals(info);
2705 s = info->serial_signals;
2706 events = mask &
2707 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2708 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2709 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2710 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2711 if (events) {
2712 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2713 goto exit;
2714 }
2715
2716 /* save current irq counts */
2717 cprev = info->icount;
2718 oldsigs = info->input_signal_events;
2719
2720 /* enable hunt and idle irqs if needed */
2721 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2722 u16 oldreg = usc_InReg(info,RICR);
2723 u16 newreg = oldreg +
2724 (mask & MgslEvent_ExitHuntMode ? RXSTATUS_EXITED_HUNT:0) +
2725 (mask & MgslEvent_IdleReceived ? RXSTATUS_IDLE_RECEIVED:0);
2726 if (oldreg != newreg)
2727 usc_OutReg(info, RICR, newreg);
2728 }
2729
2730 set_current_state(TASK_INTERRUPTIBLE);
2731 add_wait_queue(&info->event_wait_q, &wait);
2732
2733 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2734
2735
2736 for(;;) {
2737 schedule();
2738 if (signal_pending(current)) {
2739 rc = -ERESTARTSYS;
2740 break;
2741 }
2742
2743 /* get current irq counts */
2744 spin_lock_irqsave(&info->irq_spinlock,flags);
2745 cnow = info->icount;
2746 newsigs = info->input_signal_events;
2747 set_current_state(TASK_INTERRUPTIBLE);
2748 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2749
2750 /* if no change, wait aborted for some reason */
2751 if (newsigs.dsr_up == oldsigs.dsr_up &&
2752 newsigs.dsr_down == oldsigs.dsr_down &&
2753 newsigs.dcd_up == oldsigs.dcd_up &&
2754 newsigs.dcd_down == oldsigs.dcd_down &&
2755 newsigs.cts_up == oldsigs.cts_up &&
2756 newsigs.cts_down == oldsigs.cts_down &&
2757 newsigs.ri_up == oldsigs.ri_up &&
2758 newsigs.ri_down == oldsigs.ri_down &&
2759 cnow.exithunt == cprev.exithunt &&
2760 cnow.rxidle == cprev.rxidle) {
2761 rc = -EIO;
2762 break;
2763 }
2764
2765 events = mask &
2766 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2767 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2768 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2769 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2770 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2771 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2772 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2773 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2774 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2775 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2776 if (events)
2777 break;
2778
2779 cprev = cnow;
2780 oldsigs = newsigs;
2781 }
2782
2783 remove_wait_queue(&info->event_wait_q, &wait);
2784 set_current_state(TASK_RUNNING);
2785
2786 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2787 spin_lock_irqsave(&info->irq_spinlock,flags);
2788 if (!waitqueue_active(&info->event_wait_q)) {
2789 /* disable enable exit hunt mode/idle rcvd IRQs */
2790 usc_OutReg(info, RICR, usc_InReg(info,RICR) &
2791 ~(RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED));
2792 }
2793 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2794 }
2795 exit:
2796 if ( rc == 0 )
2797 PUT_USER(rc, events, mask_ptr);
2798
2799 return rc;
2800
2801 } /* end of mgsl_wait_event() */
2802
2803 static int modem_input_wait(struct mgsl_struct *info,int arg)
2804 {
2805 unsigned long flags;
2806 int rc;
2807 struct mgsl_icount cprev, cnow;
2808 DECLARE_WAITQUEUE(wait, current);
2809
2810 /* save current irq counts */
2811 spin_lock_irqsave(&info->irq_spinlock,flags);
2812 cprev = info->icount;
2813 add_wait_queue(&info->status_event_wait_q, &wait);
2814 set_current_state(TASK_INTERRUPTIBLE);
2815 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2816
2817 for(;;) {
2818 schedule();
2819 if (signal_pending(current)) {
2820 rc = -ERESTARTSYS;
2821 break;
2822 }
2823
2824 /* get new irq counts */
2825 spin_lock_irqsave(&info->irq_spinlock,flags);
2826 cnow = info->icount;
2827 set_current_state(TASK_INTERRUPTIBLE);
2828 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2829
2830 /* if no change, wait aborted for some reason */
2831 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2832 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2833 rc = -EIO;
2834 break;
2835 }
2836
2837 /* check for change in caller specified modem input */
2838 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2839 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2840 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2841 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2842 rc = 0;
2843 break;
2844 }
2845
2846 cprev = cnow;
2847 }
2848 remove_wait_queue(&info->status_event_wait_q, &wait);
2849 set_current_state(TASK_RUNNING);
2850 return rc;
2851 }
2852
2853 /* return the state of the serial control and status signals
2854 */
2855 static int tiocmget(struct tty_struct *tty, struct file *file)
2856 {
2857 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2858 unsigned int result;
2859 unsigned long flags;
2860
2861 spin_lock_irqsave(&info->irq_spinlock,flags);
2862 usc_get_serial_signals(info);
2863 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2864
2865 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2866 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2867 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2868 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
2869 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2870 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2871
2872 if (debug_level >= DEBUG_LEVEL_INFO)
2873 printk("%s(%d):%s tiocmget() value=%08X\n",
2874 __FILE__,__LINE__, info->device_name, result );
2875 return result;
2876 }
2877
2878 /* set modem control signals (DTR/RTS)
2879 */
2880 static int tiocmset(struct tty_struct *tty, struct file *file,
2881 unsigned int set, unsigned int clear)
2882 {
2883 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2884 unsigned long flags;
2885
2886 if (debug_level >= DEBUG_LEVEL_INFO)
2887 printk("%s(%d):%s tiocmset(%x,%x)\n",
2888 __FILE__,__LINE__,info->device_name, set, clear);
2889
2890 if (set & TIOCM_RTS)
2891 info->serial_signals |= SerialSignal_RTS;
2892 if (set & TIOCM_DTR)
2893 info->serial_signals |= SerialSignal_DTR;
2894 if (clear & TIOCM_RTS)
2895 info->serial_signals &= ~SerialSignal_RTS;
2896 if (clear & TIOCM_DTR)
2897 info->serial_signals &= ~SerialSignal_DTR;
2898
2899 spin_lock_irqsave(&info->irq_spinlock,flags);
2900 usc_set_serial_signals(info);
2901 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2902
2903 return 0;
2904 }
2905
2906 /* mgsl_break() Set or clear transmit break condition
2907 *
2908 * Arguments: tty pointer to tty instance data
2909 * break_state -1=set break condition, 0=clear
2910 * Return Value: None
2911 */
2912 static void mgsl_break(struct tty_struct *tty, int break_state)
2913 {
2914 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
2915 unsigned long flags;
2916
2917 if (debug_level >= DEBUG_LEVEL_INFO)
2918 printk("%s(%d):mgsl_break(%s,%d)\n",
2919 __FILE__,__LINE__, info->device_name, break_state);
2920
2921 if (mgsl_paranoia_check(info, tty->name, "mgsl_break"))
2922 return;
2923
2924 spin_lock_irqsave(&info->irq_spinlock,flags);
2925 if (break_state == -1)
2926 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) | BIT7));
2927 else
2928 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) & ~BIT7));
2929 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2930
2931 } /* end of mgsl_break() */
2932
2933 /* mgsl_ioctl() Service an IOCTL request
2934 *
2935 * Arguments:
2936 *
2937 * tty pointer to tty instance data
2938 * file pointer to associated file object for device
2939 * cmd IOCTL command code
2940 * arg command argument/context
2941 *
2942 * Return Value: 0 if success, otherwise error code
2943 */
2944 static int mgsl_ioctl(struct tty_struct *tty, struct file * file,
2945 unsigned int cmd, unsigned long arg)
2946 {
2947 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
2948
2949 if (debug_level >= DEBUG_LEVEL_INFO)
2950 printk("%s(%d):mgsl_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2951 info->device_name, cmd );
2952
2953 if (mgsl_paranoia_check(info, tty->name, "mgsl_ioctl"))
2954 return -ENODEV;
2955
2956 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2957 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
2958 if (tty->flags & (1 << TTY_IO_ERROR))
2959 return -EIO;
2960 }
2961
2962 return mgsl_ioctl_common(info, cmd, arg);
2963 }
2964
2965 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg)
2966 {
2967 int error;
2968 struct mgsl_icount cnow; /* kernel counter temps */
2969 void __user *argp = (void __user *)arg;
2970 struct serial_icounter_struct __user *p_cuser; /* user space */
2971 unsigned long flags;
2972
2973 switch (cmd) {
2974 case MGSL_IOCGPARAMS:
2975 return mgsl_get_params(info, argp);
2976 case MGSL_IOCSPARAMS:
2977 return mgsl_set_params(info, argp);
2978 case MGSL_IOCGTXIDLE:
2979 return mgsl_get_txidle(info, argp);
2980 case MGSL_IOCSTXIDLE:
2981 return mgsl_set_txidle(info,(int)arg);
2982 case MGSL_IOCTXENABLE:
2983 return mgsl_txenable(info,(int)arg);
2984 case MGSL_IOCRXENABLE:
2985 return mgsl_rxenable(info,(int)arg);
2986 case MGSL_IOCTXABORT:
2987 return mgsl_txabort(info);
2988 case MGSL_IOCGSTATS:
2989 return mgsl_get_stats(info, argp);
2990 case MGSL_IOCWAITEVENT:
2991 return mgsl_wait_event(info, argp);
2992 case MGSL_IOCLOOPTXDONE:
2993 return mgsl_loopmode_send_done(info);
2994 /* Wait for modem input (DCD,RI,DSR,CTS) change
2995 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
2996 */
2997 case TIOCMIWAIT:
2998 return modem_input_wait(info,(int)arg);
2999
3000 /*
3001 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
3002 * Return: write counters to the user passed counter struct
3003 * NB: both 1->0 and 0->1 transitions are counted except for
3004 * RI where only 0->1 is counted.
3005 */
3006 case TIOCGICOUNT:
3007 spin_lock_irqsave(&info->irq_spinlock,flags);
3008 cnow = info->icount;
3009 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3010 p_cuser = argp;
3011 PUT_USER(error,cnow.cts, &p_cuser->cts);
3012 if (error) return error;
3013 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
3014 if (error) return error;
3015 PUT_USER(error,cnow.rng, &p_cuser->rng);
3016 if (error) return error;
3017 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
3018 if (error) return error;
3019 PUT_USER(error,cnow.rx, &p_cuser->rx);
3020 if (error) return error;
3021 PUT_USER(error,cnow.tx, &p_cuser->tx);
3022 if (error) return error;
3023 PUT_USER(error,cnow.frame, &p_cuser->frame);
3024 if (error) return error;
3025 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
3026 if (error) return error;
3027 PUT_USER(error,cnow.parity, &p_cuser->parity);
3028 if (error) return error;
3029 PUT_USER(error,cnow.brk, &p_cuser->brk);
3030 if (error) return error;
3031 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
3032 if (error) return error;
3033 return 0;
3034 default:
3035 return -ENOIOCTLCMD;
3036 }
3037 return 0;
3038 }
3039
3040 /* mgsl_set_termios()
3041 *
3042 * Set new termios settings
3043 *
3044 * Arguments:
3045 *
3046 * tty pointer to tty structure
3047 * termios pointer to buffer to hold returned old termios
3048 *
3049 * Return Value: None
3050 */
3051 static void mgsl_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
3052 {
3053 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
3054 unsigned long flags;
3055
3056 if (debug_level >= DEBUG_LEVEL_INFO)
3057 printk("%s(%d):mgsl_set_termios %s\n", __FILE__,__LINE__,
3058 tty->driver->name );
3059
3060 mgsl_change_params(info);
3061
3062 /* Handle transition to B0 status */
3063 if (old_termios->c_cflag & CBAUD &&
3064 !(tty->termios->c_cflag & CBAUD)) {
3065 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3066 spin_lock_irqsave(&info->irq_spinlock,flags);
3067 usc_set_serial_signals(info);
3068 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3069 }
3070
3071 /* Handle transition away from B0 status */
3072 if (!(old_termios->c_cflag & CBAUD) &&
3073 tty->termios->c_cflag & CBAUD) {
3074 info->serial_signals |= SerialSignal_DTR;
3075 if (!(tty->termios->c_cflag & CRTSCTS) ||
3076 !test_bit(TTY_THROTTLED, &tty->flags)) {
3077 info->serial_signals |= SerialSignal_RTS;
3078 }
3079 spin_lock_irqsave(&info->irq_spinlock,flags);
3080 usc_set_serial_signals(info);
3081 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3082 }
3083
3084 /* Handle turning off CRTSCTS */
3085 if (old_termios->c_cflag & CRTSCTS &&
3086 !(tty->termios->c_cflag & CRTSCTS)) {
3087 tty->hw_stopped = 0;
3088 mgsl_start(tty);
3089 }
3090
3091 } /* end of mgsl_set_termios() */
3092
3093 /* mgsl_close()
3094 *
3095 * Called when port is closed. Wait for remaining data to be
3096 * sent. Disable port and free resources.
3097 *
3098 * Arguments:
3099 *
3100 * tty pointer to open tty structure
3101 * filp pointer to open file object
3102 *
3103 * Return Value: None
3104 */
3105 static void mgsl_close(struct tty_struct *tty, struct file * filp)
3106 {
3107 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3108
3109 if (mgsl_paranoia_check(info, tty->name, "mgsl_close"))
3110 return;
3111
3112 if (debug_level >= DEBUG_LEVEL_INFO)
3113 printk("%s(%d):mgsl_close(%s) entry, count=%d\n",
3114 __FILE__,__LINE__, info->device_name, info->count);
3115
3116 if (!info->count)
3117 return;
3118
3119 if (tty_hung_up_p(filp))
3120 goto cleanup;
3121
3122 if ((tty->count == 1) && (info->count != 1)) {
3123 /*
3124 * tty->count is 1 and the tty structure will be freed.
3125 * info->count should be one in this case.
3126 * if it's not, correct it so that the port is shutdown.
3127 */
3128 printk("mgsl_close: bad refcount; tty->count is 1, "
3129 "info->count is %d\n", info->count);
3130 info->count = 1;
3131 }
3132
3133 info->count--;
3134
3135 /* if at least one open remaining, leave hardware active */
3136 if (info->count)
3137 goto cleanup;
3138
3139 info->flags |= ASYNC_CLOSING;
3140
3141 /* set tty->closing to notify line discipline to
3142 * only process XON/XOFF characters. Only the N_TTY
3143 * discipline appears to use this (ppp does not).
3144 */
3145 tty->closing = 1;
3146
3147 /* wait for transmit data to clear all layers */
3148
3149 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
3150 if (debug_level >= DEBUG_LEVEL_INFO)
3151 printk("%s(%d):mgsl_close(%s) calling tty_wait_until_sent\n",
3152 __FILE__,__LINE__, info->device_name );
3153 tty_wait_until_sent(tty, info->closing_wait);
3154 }
3155
3156 if (info->flags & ASYNC_INITIALIZED)
3157 mgsl_wait_until_sent(tty, info->timeout);
3158
3159 if (tty->driver->flush_buffer)
3160 tty->driver->flush_buffer(tty);
3161
3162 tty_ldisc_flush(tty);
3163
3164 shutdown(info);
3165
3166 tty->closing = 0;
3167 info->tty = NULL;
3168
3169 if (info->blocked_open) {
3170 if (info->close_delay) {
3171 msleep_interruptible(jiffies_to_msecs(info->close_delay));
3172 }
3173 wake_up_interruptible(&info->open_wait);
3174 }
3175
3176 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
3177
3178 wake_up_interruptible(&info->close_wait);
3179
3180 cleanup:
3181 if (debug_level >= DEBUG_LEVEL_INFO)
3182 printk("%s(%d):mgsl_close(%s) exit, count=%d\n", __FILE__,__LINE__,
3183 tty->driver->name, info->count);
3184
3185 } /* end of mgsl_close() */
3186
3187 /* mgsl_wait_until_sent()
3188 *
3189 * Wait until the transmitter is empty.
3190 *
3191 * Arguments:
3192 *
3193 * tty pointer to tty info structure
3194 * timeout time to wait for send completion
3195 *
3196 * Return Value: None
3197 */
3198 static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout)
3199 {
3200 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3201 unsigned long orig_jiffies, char_time;
3202
3203 if (!info )
3204 return;
3205
3206 if (debug_level >= DEBUG_LEVEL_INFO)
3207 printk("%s(%d):mgsl_wait_until_sent(%s) entry\n",
3208 __FILE__,__LINE__, info->device_name );
3209
3210 if (mgsl_paranoia_check(info, tty->name, "mgsl_wait_until_sent"))
3211 return;
3212
3213 if (!(info->flags & ASYNC_INITIALIZED))
3214 goto exit;
3215
3216 orig_jiffies = jiffies;
3217
3218 /* Set check interval to 1/5 of estimated time to
3219 * send a character, and make it at least 1. The check
3220 * interval should also be less than the timeout.
3221 * Note: use tight timings here to satisfy the NIST-PCTS.
3222 */
3223
3224 if ( info->params.data_rate ) {
3225 char_time = info->timeout/(32 * 5);
3226 if (!char_time)
3227 char_time++;
3228 } else
3229 char_time = 1;
3230
3231 if (timeout)
3232 char_time = min_t(unsigned long, char_time, timeout);
3233
3234 if ( info->params.mode == MGSL_MODE_HDLC ||
3235 info->params.mode == MGSL_MODE_RAW ) {
3236 while (info->tx_active) {
3237 msleep_interruptible(jiffies_to_msecs(char_time));
3238 if (signal_pending(current))
3239 break;
3240 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3241 break;
3242 }
3243 } else {
3244 while (!(usc_InReg(info,TCSR) & TXSTATUS_ALL_SENT) &&
3245 info->tx_enabled) {
3246 msleep_interruptible(jiffies_to_msecs(char_time));
3247 if (signal_pending(current))
3248 break;
3249 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3250 break;
3251 }
3252 }
3253
3254 exit:
3255 if (debug_level >= DEBUG_LEVEL_INFO)
3256 printk("%s(%d):mgsl_wait_until_sent(%s) exit\n",
3257 __FILE__,__LINE__, info->device_name );
3258
3259 } /* end of mgsl_wait_until_sent() */
3260
3261 /* mgsl_hangup()
3262 *
3263 * Called by tty_hangup() when a hangup is signaled.
3264 * This is the same as to closing all open files for the port.
3265 *
3266 * Arguments: tty pointer to associated tty object
3267 * Return Value: None
3268 */
3269 static void mgsl_hangup(struct tty_struct *tty)
3270 {
3271 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3272
3273 if (debug_level >= DEBUG_LEVEL_INFO)
3274 printk("%s(%d):mgsl_hangup(%s)\n",
3275 __FILE__,__LINE__, info->device_name );
3276
3277 if (mgsl_paranoia_check(info, tty->name, "mgsl_hangup"))
3278 return;
3279
3280 mgsl_flush_buffer(tty);
3281 shutdown(info);
3282
3283 info->count = 0;
3284 info->flags &= ~ASYNC_NORMAL_ACTIVE;
3285 info->tty = NULL;
3286
3287 wake_up_interruptible(&info->open_wait);
3288
3289 } /* end of mgsl_hangup() */
3290
3291 /* block_til_ready()
3292 *
3293 * Block the current process until the specified port
3294 * is ready to be opened.
3295 *
3296 * Arguments:
3297 *
3298 * tty pointer to tty info structure
3299 * filp pointer to open file object
3300 * info pointer to device instance data
3301 *
3302 * Return Value: 0 if success, otherwise error code
3303 */
3304 static int block_til_ready(struct tty_struct *tty, struct file * filp,
3305 struct mgsl_struct *info)
3306 {
3307 DECLARE_WAITQUEUE(wait, current);
3308 int retval;
3309 int do_clocal = 0, extra_count = 0;
3310 unsigned long flags;
3311
3312 if (debug_level >= DEBUG_LEVEL_INFO)
3313 printk("%s(%d):block_til_ready on %s\n",
3314 __FILE__,__LINE__, tty->driver->name );
3315
3316 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3317 /* nonblock mode is set or port is not enabled */
3318 info->flags |= ASYNC_NORMAL_ACTIVE;
3319 return 0;
3320 }
3321
3322 if (tty->termios->c_cflag & CLOCAL)
3323 do_clocal = 1;
3324
3325 /* Wait for carrier detect and the line to become
3326 * free (i.e., not in use by the callout). While we are in
3327 * this loop, info->count is dropped by one, so that
3328 * mgsl_close() knows when to free things. We restore it upon
3329 * exit, either normal or abnormal.
3330 */
3331
3332 retval = 0;
3333 add_wait_queue(&info->open_wait, &wait);
3334
3335 if (debug_level >= DEBUG_LEVEL_INFO)
3336 printk("%s(%d):block_til_ready before block on %s count=%d\n",
3337 __FILE__,__LINE__, tty->driver->name, info->count );
3338
3339 spin_lock_irqsave(&info->irq_spinlock, flags);
3340 if (!tty_hung_up_p(filp)) {
3341 extra_count = 1;
3342 info->count--;
3343 }
3344 spin_unlock_irqrestore(&info->irq_spinlock, flags);
3345 info->blocked_open++;
3346
3347 while (1) {
3348 if (tty->termios->c_cflag & CBAUD) {
3349 spin_lock_irqsave(&info->irq_spinlock,flags);
3350 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3351 usc_set_serial_signals(info);
3352 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3353 }
3354
3355 set_current_state(TASK_INTERRUPTIBLE);
3356
3357 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
3358 retval = (info->flags & ASYNC_HUP_NOTIFY) ?
3359 -EAGAIN : -ERESTARTSYS;
3360 break;
3361 }
3362
3363 spin_lock_irqsave(&info->irq_spinlock,flags);
3364 usc_get_serial_signals(info);
3365 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3366
3367 if (!(info->flags & ASYNC_CLOSING) &&
3368 (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
3369 break;
3370 }
3371
3372 if (signal_pending(current)) {
3373 retval = -ERESTARTSYS;
3374 break;
3375 }
3376
3377 if (debug_level >= DEBUG_LEVEL_INFO)
3378 printk("%s(%d):block_til_ready blocking on %s count=%d\n",
3379 __FILE__,__LINE__, tty->driver->name, info->count );
3380
3381 schedule();
3382 }
3383
3384 set_current_state(TASK_RUNNING);
3385 remove_wait_queue(&info->open_wait, &wait);
3386
3387 if (extra_count)
3388 info->count++;
3389 info->blocked_open--;
3390
3391 if (debug_level >= DEBUG_LEVEL_INFO)
3392 printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
3393 __FILE__,__LINE__, tty->driver->name, info->count );
3394
3395 if (!retval)
3396 info->flags |= ASYNC_NORMAL_ACTIVE;
3397
3398 return retval;
3399
3400 } /* end of block_til_ready() */
3401
3402 /* mgsl_open()
3403 *
3404 * Called when a port is opened. Init and enable port.
3405 * Perform serial-specific initialization for the tty structure.
3406 *
3407 * Arguments: tty pointer to tty info structure
3408 * filp associated file pointer
3409 *
3410 * Return Value: 0 if success, otherwise error code
3411 */
3412 static int mgsl_open(struct tty_struct *tty, struct file * filp)
3413 {
3414 struct mgsl_struct *info;
3415 int retval, line;
3416 unsigned long flags;
3417
3418 /* verify range of specified line number */
3419 line = tty->index;
3420 if ((line < 0) || (line >= mgsl_device_count)) {
3421 printk("%s(%d):mgsl_open with invalid line #%d.\n",
3422 __FILE__,__LINE__,line);
3423 return -ENODEV;
3424 }
3425
3426 /* find the info structure for the specified line */
3427 info = mgsl_device_list;
3428 while(info && info->line != line)
3429 info = info->next_device;
3430 if (mgsl_paranoia_check(info, tty->name, "mgsl_open"))
3431 return -ENODEV;
3432
3433 tty->driver_data = info;
3434 info->tty = tty;
3435
3436 if (debug_level >= DEBUG_LEVEL_INFO)
3437 printk("%s(%d):mgsl_open(%s), old ref count = %d\n",
3438 __FILE__,__LINE__,tty->driver->name, info->count);
3439
3440 /* If port is closing, signal caller to try again */
3441 if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
3442 if (info->flags & ASYNC_CLOSING)
3443 interruptible_sleep_on(&info->close_wait);
3444 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
3445 -EAGAIN : -ERESTARTSYS);
3446 goto cleanup;
3447 }
3448
3449 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
3450
3451 spin_lock_irqsave(&info->netlock, flags);
3452 if (info->netcount) {
3453 retval = -EBUSY;
3454 spin_unlock_irqrestore(&info->netlock, flags);
3455 goto cleanup;
3456 }
3457 info->count++;
3458 spin_unlock_irqrestore(&info->netlock, flags);
3459
3460 if (info->count == 1) {
3461 /* 1st open on this device, init hardware */
3462 retval = startup(info);
3463 if (retval < 0)
3464 goto cleanup;
3465 }
3466
3467 retval = block_til_ready(tty, filp, info);
3468 if (retval) {
3469 if (debug_level >= DEBUG_LEVEL_INFO)
3470 printk("%s(%d):block_til_ready(%s) returned %d\n",
3471 __FILE__,__LINE__, info->device_name, retval);
3472 goto cleanup;
3473 }
3474
3475 if (debug_level >= DEBUG_LEVEL_INFO)
3476 printk("%s(%d):mgsl_open(%s) success\n",
3477 __FILE__,__LINE__, info->device_name);
3478 retval = 0;
3479
3480 cleanup:
3481 if (retval) {
3482 if (tty->count == 1)
3483 info->tty = NULL; /* tty layer will release tty struct */
3484 if(info->count)
3485 info->count--;
3486 }
3487
3488 return retval;
3489
3490 } /* end of mgsl_open() */
3491
3492 /*
3493 * /proc fs routines....
3494 */
3495
3496 static inline int line_info(char *buf, struct mgsl_struct *info)
3497 {
3498 char stat_buf[30];
3499 int ret;
3500 unsigned long flags;
3501
3502 if (info->bus_type == MGSL_BUS_TYPE_PCI) {
3503 ret = sprintf(buf, "%s:PCI io:%04X irq:%d mem:%08X lcr:%08X",
3504 info->device_name, info->io_base, info->irq_level,
3505 info->phys_memory_base, info->phys_lcr_base);
3506 } else {
3507 ret = sprintf(buf, "%s:(E)ISA io:%04X irq:%d dma:%d",
3508 info->device_name, info->io_base,
3509 info->irq_level, info->dma_level);
3510 }
3511
3512 /* output current serial signal states */
3513 spin_lock_irqsave(&info->irq_spinlock,flags);
3514 usc_get_serial_signals(info);
3515 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3516
3517 stat_buf[0] = 0;
3518 stat_buf[1] = 0;
3519 if (info->serial_signals & SerialSignal_RTS)
3520 strcat(stat_buf, "|RTS");
3521 if (info->serial_signals & SerialSignal_CTS)
3522 strcat(stat_buf, "|CTS");
3523 if (info->serial_signals & SerialSignal_DTR)
3524 strcat(stat_buf, "|DTR");
3525 if (info->serial_signals & SerialSignal_DSR)
3526 strcat(stat_buf, "|DSR");
3527 if (info->serial_signals & SerialSignal_DCD)
3528 strcat(stat_buf, "|CD");
3529 if (info->serial_signals & SerialSignal_RI)
3530 strcat(stat_buf, "|RI");
3531
3532 if (info->params.mode == MGSL_MODE_HDLC ||
3533 info->params.mode == MGSL_MODE_RAW ) {
3534 ret += sprintf(buf+ret, " HDLC txok:%d rxok:%d",
3535 info->icount.txok, info->icount.rxok);
3536 if (info->icount.txunder)
3537 ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
3538 if (info->icount.txabort)
3539 ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
3540 if (info->icount.rxshort)
3541 ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
3542 if (info->icount.rxlong)
3543 ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
3544 if (info->icount.rxover)
3545 ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
3546 if (info->icount.rxcrc)
3547 ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
3548 } else {
3549 ret += sprintf(buf+ret, " ASYNC tx:%d rx:%d",
3550 info->icount.tx, info->icount.rx);
3551 if (info->icount.frame)
3552 ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
3553 if (info->icount.parity)
3554 ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
3555 if (info->icount.brk)
3556 ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
3557 if (info->icount.overrun)
3558 ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
3559 }
3560
3561 /* Append serial signal status to end */
3562 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
3563
3564 ret += sprintf(buf+ret, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
3565 info->tx_active,info->bh_requested,info->bh_running,
3566 info->pending_bh);
3567
3568 spin_lock_irqsave(&info->irq_spinlock,flags);
3569 {
3570 u16 Tcsr = usc_InReg( info, TCSR );
3571 u16 Tdmr = usc_InDmaReg( info, TDMR );
3572 u16 Ticr = usc_InReg( info, TICR );
3573 u16 Rscr = usc_InReg( info, RCSR );
3574 u16 Rdmr = usc_InDmaReg( info, RDMR );
3575 u16 Ricr = usc_InReg( info, RICR );
3576 u16 Icr = usc_InReg( info, ICR );
3577 u16 Dccr = usc_InReg( info, DCCR );
3578 u16 Tmr = usc_InReg( info, TMR );
3579 u16 Tccr = usc_InReg( info, TCCR );
3580 u16 Ccar = inw( info->io_base + CCAR );
3581 ret += sprintf(buf+ret, "tcsr=%04X tdmr=%04X ticr=%04X rcsr=%04X rdmr=%04X\n"
3582 "ricr=%04X icr =%04X dccr=%04X tmr=%04X tccr=%04X ccar=%04X\n",
3583 Tcsr,Tdmr,Ticr,Rscr,Rdmr,Ricr,Icr,Dccr,Tmr,Tccr,Ccar );
3584 }
3585 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3586
3587 return ret;
3588
3589 } /* end of line_info() */
3590
3591 /* mgsl_read_proc()
3592 *
3593 * Called to print information about devices
3594 *
3595 * Arguments:
3596 * page page of memory to hold returned info
3597 * start
3598 * off
3599 * count
3600 * eof
3601 * data
3602 *
3603 * Return Value:
3604 */
3605 static int mgsl_read_proc(char *page, char **start, off_t off, int count,
3606 int *eof, void *data)
3607 {
3608 int len = 0, l;
3609 off_t begin = 0;
3610 struct mgsl_struct *info;
3611
3612 len += sprintf(page, "synclink driver:%s\n", driver_version);
3613
3614 info = mgsl_device_list;
3615 while( info ) {
3616 l = line_info(page + len, info);
3617 len += l;
3618 if (len+begin > off+count)
3619 goto done;
3620 if (len+begin < off) {
3621 begin += len;
3622 len = 0;
3623 }
3624 info = info->next_device;
3625 }
3626
3627 *eof = 1;
3628 done:
3629 if (off >= len+begin)
3630 return 0;
3631 *start = page + (off-begin);
3632 return ((count < begin+len-off) ? count : begin+len-off);
3633
3634 } /* end of mgsl_read_proc() */
3635
3636 /* mgsl_allocate_dma_buffers()
3637 *
3638 * Allocate and format DMA buffers (ISA adapter)
3639 * or format shared memory buffers (PCI adapter).
3640 *
3641 * Arguments: info pointer to device instance data
3642 * Return Value: 0 if success, otherwise error
3643 */
3644 static int mgsl_allocate_dma_buffers(struct mgsl_struct *info)
3645 {
3646 unsigned short BuffersPerFrame;
3647
3648 info->last_mem_alloc = 0;
3649
3650 /* Calculate the number of DMA buffers necessary to hold the */
3651 /* largest allowable frame size. Note: If the max frame size is */
3652 /* not an even multiple of the DMA buffer size then we need to */
3653 /* round the buffer count per frame up one. */
3654
3655 BuffersPerFrame = (unsigned short)(info->max_frame_size/DMABUFFERSIZE);
3656 if ( info->max_frame_size % DMABUFFERSIZE )
3657 BuffersPerFrame++;
3658
3659 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3660 /*
3661 * The PCI adapter has 256KBytes of shared memory to use.
3662 * This is 64 PAGE_SIZE buffers.
3663 *
3664 * The first page is used for padding at this time so the
3665 * buffer list does not begin at offset 0 of the PCI
3666 * adapter's shared memory.
3667 *
3668 * The 2nd page is used for the buffer list. A 4K buffer
3669 * list can hold 128 DMA_BUFFER structures at 32 bytes
3670 * each.
3671 *
3672 * This leaves 62 4K pages.
3673 *
3674 * The next N pages are used for transmit frame(s). We
3675 * reserve enough 4K page blocks to hold the required
3676 * number of transmit dma buffers (num_tx_dma_buffers),
3677 * each of MaxFrameSize size.
3678 *
3679 * Of the remaining pages (62-N), determine how many can
3680 * be used to receive full MaxFrameSize inbound frames
3681 */
3682 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3683 info->rx_buffer_count = 62 - info->tx_buffer_count;
3684 } else {
3685 /* Calculate the number of PAGE_SIZE buffers needed for */
3686 /* receive and transmit DMA buffers. */
3687
3688
3689 /* Calculate the number of DMA buffers necessary to */
3690 /* hold 7 max size receive frames and one max size transmit frame. */
3691 /* The receive buffer count is bumped by one so we avoid an */
3692 /* End of List condition if all receive buffers are used when */
3693 /* using linked list DMA buffers. */
3694
3695 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3696 info->rx_buffer_count = (BuffersPerFrame * MAXRXFRAMES) + 6;
3697
3698 /*
3699 * limit total TxBuffers & RxBuffers to 62 4K total
3700 * (ala PCI Allocation)
3701 */
3702
3703 if ( (info->tx_buffer_count + info->rx_buffer_count) > 62 )
3704 info->rx_buffer_count = 62 - info->tx_buffer_count;
3705
3706 }
3707
3708 if ( debug_level >= DEBUG_LEVEL_INFO )
3709 printk("%s(%d):Allocating %d TX and %d RX DMA buffers.\n",
3710 __FILE__,__LINE__, info->tx_buffer_count,info->rx_buffer_count);
3711
3712 if ( mgsl_alloc_buffer_list_memory( info ) < 0 ||
3713 mgsl_alloc_frame_memory(info, info->rx_buffer_list, info->rx_buffer_count) < 0 ||
3714 mgsl_alloc_frame_memory(info, info->tx_buffer_list, info->tx_buffer_count) < 0 ||
3715 mgsl_alloc_intermediate_rxbuffer_memory(info) < 0 ||
3716 mgsl_alloc_intermediate_txbuffer_memory(info) < 0 ) {
3717 printk("%s(%d):Can't allocate DMA buffer memory\n",__FILE__,__LINE__);
3718 return -ENOMEM;
3719 }
3720
3721 mgsl_reset_rx_dma_buffers( info );
3722 mgsl_reset_tx_dma_buffers( info );
3723
3724 return 0;
3725
3726 } /* end of mgsl_allocate_dma_buffers() */
3727
3728 /*
3729 * mgsl_alloc_buffer_list_memory()
3730 *
3731 * Allocate a common DMA buffer for use as the
3732 * receive and transmit buffer lists.
3733 *
3734 * A buffer list is a set of buffer entries where each entry contains
3735 * a pointer to an actual buffer and a pointer to the next buffer entry
3736 * (plus some other info about the buffer).
3737 *
3738 * The buffer entries for a list are built to form a circular list so
3739 * that when the entire list has been traversed you start back at the
3740 * beginning.
3741 *
3742 * This function allocates memory for just the buffer entries.
3743 * The links (pointer to next entry) are filled in with the physical
3744 * address of the next entry so the adapter can navigate the list
3745 * using bus master DMA. The pointers to the actual buffers are filled
3746 * out later when the actual buffers are allocated.
3747 *
3748 * Arguments: info pointer to device instance data
3749 * Return Value: 0 if success, otherwise error
3750 */
3751 static int mgsl_alloc_buffer_list_memory( struct mgsl_struct *info )
3752 {
3753 unsigned int i;
3754
3755 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3756 /* PCI adapter uses shared memory. */
3757 info->buffer_list = info->memory_base + info->last_mem_alloc;
3758 info->buffer_list_phys = info->last_mem_alloc;
3759 info->last_mem_alloc += BUFFERLISTSIZE;
3760 } else {
3761 /* ISA adapter uses system memory. */
3762 /* The buffer lists are allocated as a common buffer that both */
3763 /* the processor and adapter can access. This allows the driver to */
3764 /* inspect portions of the buffer while other portions are being */
3765 /* updated by the adapter using Bus Master DMA. */
3766
3767 info->buffer_list = dma_alloc_coherent(NULL, BUFFERLISTSIZE, &info->buffer_list_dma_addr, GFP_KERNEL);
3768 if (info->buffer_list == NULL)
3769 return -ENOMEM;
3770 info->buffer_list_phys = (u32)(info->buffer_list_dma_addr);
3771 }
3772
3773 /* We got the memory for the buffer entry lists. */
3774 /* Initialize the memory block to all zeros. */
3775 memset( info->buffer_list, 0, BUFFERLISTSIZE );
3776
3777 /* Save virtual address pointers to the receive and */
3778 /* transmit buffer lists. (Receive 1st). These pointers will */
3779 /* be used by the processor to access the lists. */
3780 info->rx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3781 info->tx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3782 info->tx_buffer_list += info->rx_buffer_count;
3783
3784 /*
3785 * Build the links for the buffer entry lists such that
3786 * two circular lists are built. (Transmit and Receive).
3787 *
3788 * Note: the links are physical addresses
3789 * which are read by the adapter to determine the next
3790 * buffer entry to use.
3791 */
3792
3793 for ( i = 0; i < info->rx_buffer_count; i++ ) {
3794 /* calculate and store physical address of this buffer entry */
3795 info->rx_buffer_list[i].phys_entry =
3796 info->buffer_list_phys + (i * sizeof(DMABUFFERENTRY));
3797
3798 /* calculate and store physical address of */
3799 /* next entry in cirular list of entries */
3800
3801 info->rx_buffer_list[i].link = info->buffer_list_phys;
3802
3803 if ( i < info->rx_buffer_count - 1 )
3804 info->rx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3805 }
3806
3807 for ( i = 0; i < info->tx_buffer_count; i++ ) {
3808 /* calculate and store physical address of this buffer entry */
3809 info->tx_buffer_list[i].phys_entry = info->buffer_list_phys +
3810 ((info->rx_buffer_count + i) * sizeof(DMABUFFERENTRY));
3811
3812 /* calculate and store physical address of */
3813 /* next entry in cirular list of entries */
3814
3815 info->tx_buffer_list[i].link = info->buffer_list_phys +
3816 info->rx_buffer_count * sizeof(DMABUFFERENTRY);
3817
3818 if ( i < info->tx_buffer_count - 1 )
3819 info->tx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3820 }
3821
3822 return 0;
3823
3824 } /* end of mgsl_alloc_buffer_list_memory() */
3825
3826 /* Free DMA buffers allocated for use as the
3827 * receive and transmit buffer lists.
3828 * Warning:
3829 *
3830 * The data transfer buffers associated with the buffer list
3831 * MUST be freed before freeing the buffer list itself because
3832 * the buffer list contains the information necessary to free
3833 * the individual buffers!
3834 */
3835 static void mgsl_free_buffer_list_memory( struct mgsl_struct *info )
3836 {
3837 if (info->buffer_list && info->bus_type != MGSL_BUS_TYPE_PCI)
3838 dma_free_coherent(NULL, BUFFERLISTSIZE, info->buffer_list, info->buffer_list_dma_addr);
3839
3840 info->buffer_list = NULL;
3841 info->rx_buffer_list = NULL;
3842 info->tx_buffer_list = NULL;
3843
3844 } /* end of mgsl_free_buffer_list_memory() */
3845
3846 /*
3847 * mgsl_alloc_frame_memory()
3848 *
3849 * Allocate the frame DMA buffers used by the specified buffer list.
3850 * Each DMA buffer will be one memory page in size. This is necessary
3851 * because memory can fragment enough that it may be impossible
3852 * contiguous pages.
3853 *
3854 * Arguments:
3855 *
3856 * info pointer to device instance data
3857 * BufferList pointer to list of buffer entries
3858 * Buffercount count of buffer entries in buffer list
3859 *
3860 * Return Value: 0 if success, otherwise -ENOMEM
3861 */
3862 static int mgsl_alloc_frame_memory(struct mgsl_struct *info,DMABUFFERENTRY *BufferList,int Buffercount)
3863 {
3864 int i;
3865 u32 phys_addr;
3866
3867 /* Allocate page sized buffers for the receive buffer list */
3868
3869 for ( i = 0; i < Buffercount; i++ ) {
3870 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3871 /* PCI adapter uses shared memory buffers. */
3872 BufferList[i].virt_addr = info->memory_base + info->last_mem_alloc;
3873 phys_addr = info->last_mem_alloc;
3874 info->last_mem_alloc += DMABUFFERSIZE;
3875 } else {
3876 /* ISA adapter uses system memory. */
3877 BufferList[i].virt_addr = dma_alloc_coherent(NULL, DMABUFFERSIZE, &BufferList[i].dma_addr, GFP_KERNEL);
3878 if (BufferList[i].virt_addr == NULL)
3879 return -ENOMEM;
3880 phys_addr = (u32)(BufferList[i].dma_addr);
3881 }
3882 BufferList[i].phys_addr = phys_addr;
3883 }
3884
3885 return 0;
3886
3887 } /* end of mgsl_alloc_frame_memory() */
3888
3889 /*
3890 * mgsl_free_frame_memory()
3891 *
3892 * Free the buffers associated with
3893 * each buffer entry of a buffer list.
3894 *
3895 * Arguments:
3896 *
3897 * info pointer to device instance data
3898 * BufferList pointer to list of buffer entries
3899 * Buffercount count of buffer entries in buffer list
3900 *
3901 * Return Value: None
3902 */
3903 static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList, int Buffercount)
3904 {
3905 int i;
3906
3907 if ( BufferList ) {
3908 for ( i = 0 ; i < Buffercount ; i++ ) {
3909 if ( BufferList[i].virt_addr ) {
3910 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
3911 dma_free_coherent(NULL, DMABUFFERSIZE, BufferList[i].virt_addr, BufferList[i].dma_addr);
3912 BufferList[i].virt_addr = NULL;
3913 }
3914 }
3915 }
3916
3917 } /* end of mgsl_free_frame_memory() */
3918
3919 /* mgsl_free_dma_buffers()
3920 *
3921 * Free DMA buffers
3922 *
3923 * Arguments: info pointer to device instance data
3924 * Return Value: None
3925 */
3926 static void mgsl_free_dma_buffers( struct mgsl_struct *info )
3927 {
3928 mgsl_free_frame_memory( info, info->rx_buffer_list, info->rx_buffer_count );
3929 mgsl_free_frame_memory( info, info->tx_buffer_list, info->tx_buffer_count );
3930 mgsl_free_buffer_list_memory( info );
3931
3932 } /* end of mgsl_free_dma_buffers() */
3933
3934
3935 /*
3936 * mgsl_alloc_intermediate_rxbuffer_memory()
3937 *
3938 * Allocate a buffer large enough to hold max_frame_size. This buffer
3939 * is used to pass an assembled frame to the line discipline.
3940 *
3941 * Arguments:
3942 *
3943 * info pointer to device instance data
3944 *
3945 * Return Value: 0 if success, otherwise -ENOMEM
3946 */
3947 static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info)
3948 {
3949 info->intermediate_rxbuffer = kmalloc(info->max_frame_size, GFP_KERNEL | GFP_DMA);
3950 if ( info->intermediate_rxbuffer == NULL )
3951 return -ENOMEM;
3952
3953 return 0;
3954
3955 } /* end of mgsl_alloc_intermediate_rxbuffer_memory() */
3956
3957 /*
3958 * mgsl_free_intermediate_rxbuffer_memory()
3959 *
3960 *
3961 * Arguments:
3962 *
3963 * info pointer to device instance data
3964 *
3965 * Return Value: None
3966 */
3967 static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info)
3968 {
3969 kfree(info->intermediate_rxbuffer);
3970 info->intermediate_rxbuffer = NULL;
3971
3972 } /* end of mgsl_free_intermediate_rxbuffer_memory() */
3973
3974 /*
3975 * mgsl_alloc_intermediate_txbuffer_memory()
3976 *
3977 * Allocate intermdiate transmit buffer(s) large enough to hold max_frame_size.
3978 * This buffer is used to load transmit frames into the adapter's dma transfer
3979 * buffers when there is sufficient space.
3980 *
3981 * Arguments:
3982 *
3983 * info pointer to device instance data
3984 *
3985 * Return Value: 0 if success, otherwise -ENOMEM
3986 */
3987 static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info)
3988 {
3989 int i;
3990
3991 if ( debug_level >= DEBUG_LEVEL_INFO )
3992 printk("%s %s(%d) allocating %d tx holding buffers\n",
3993 info->device_name, __FILE__,__LINE__,info->num_tx_holding_buffers);
3994
3995 memset(info->tx_holding_buffers,0,sizeof(info->tx_holding_buffers));
3996
3997 for ( i=0; i<info->num_tx_holding_buffers; ++i) {
3998 info->tx_holding_buffers[i].buffer =
3999 kmalloc(info->max_frame_size, GFP_KERNEL);
4000 if (info->tx_holding_buffers[i].buffer == NULL) {
4001 for (--i; i >= 0; i--) {
4002 kfree(info->tx_holding_buffers[i].buffer);
4003 info->tx_holding_buffers[i].buffer = NULL;
4004 }
4005 return -ENOMEM;
4006 }
4007 }
4008
4009 return 0;
4010
4011 } /* end of mgsl_alloc_intermediate_txbuffer_memory() */
4012
4013 /*
4014 * mgsl_free_intermediate_txbuffer_memory()
4015 *
4016 *
4017 * Arguments:
4018 *
4019 * info pointer to device instance data
4020 *
4021 * Return Value: None
4022 */
4023 static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info)
4024 {
4025 int i;
4026
4027 for ( i=0; i<info->num_tx_holding_buffers; ++i ) {
4028 kfree(info->tx_holding_buffers[i].buffer);
4029 info->tx_holding_buffers[i].buffer = NULL;
4030 }
4031
4032 info->get_tx_holding_index = 0;
4033 info->put_tx_holding_index = 0;
4034 info->tx_holding_count = 0;
4035
4036 } /* end of mgsl_free_intermediate_txbuffer_memory() */
4037
4038
4039 /*
4040 * load_next_tx_holding_buffer()
4041 *
4042 * attempts to load the next buffered tx request into the
4043 * tx dma buffers
4044 *
4045 * Arguments:
4046 *
4047 * info pointer to device instance data
4048 *
4049 * Return Value: 1 if next buffered tx request loaded
4050 * into adapter's tx dma buffer,
4051 * 0 otherwise
4052 */
4053 static int load_next_tx_holding_buffer(struct mgsl_struct *info)
4054 {
4055 int ret = 0;
4056
4057 if ( info->tx_holding_count ) {
4058 /* determine if we have enough tx dma buffers
4059 * to accommodate the next tx frame
4060 */
4061 struct tx_holding_buffer *ptx =
4062 &info->tx_holding_buffers[info->get_tx_holding_index];
4063 int num_free = num_free_tx_dma_buffers(info);
4064 int num_needed = ptx->buffer_size / DMABUFFERSIZE;
4065 if ( ptx->buffer_size % DMABUFFERSIZE )
4066 ++num_needed;
4067
4068 if (num_needed <= num_free) {
4069 info->xmit_cnt = ptx->buffer_size;
4070 mgsl_load_tx_dma_buffer(info,ptx->buffer,ptx->buffer_size);
4071
4072 --info->tx_holding_count;
4073 if ( ++info->get_tx_holding_index >= info->num_tx_holding_buffers)
4074 info->get_tx_holding_index=0;
4075
4076 /* restart transmit timer */
4077 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(5000));
4078
4079 ret = 1;
4080 }
4081 }
4082
4083 return ret;
4084 }
4085
4086 /*
4087 * save_tx_buffer_request()
4088 *
4089 * attempt to store transmit frame request for later transmission
4090 *
4091 * Arguments:
4092 *
4093 * info pointer to device instance data
4094 * Buffer pointer to buffer containing frame to load
4095 * BufferSize size in bytes of frame in Buffer
4096 *
4097 * Return Value: 1 if able to store, 0 otherwise
4098 */
4099 static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize)
4100 {
4101 struct tx_holding_buffer *ptx;
4102
4103 if ( info->tx_holding_count >= info->num_tx_holding_buffers ) {
4104 return 0; /* all buffers in use */
4105 }
4106
4107 ptx = &info->tx_holding_buffers[info->put_tx_holding_index];
4108 ptx->buffer_size = BufferSize;
4109 memcpy( ptx->buffer, Buffer, BufferSize);
4110
4111 ++info->tx_holding_count;
4112 if ( ++info->put_tx_holding_index >= info->num_tx_holding_buffers)
4113 info->put_tx_holding_index=0;
4114
4115 return 1;
4116 }
4117
4118 static int mgsl_claim_resources(struct mgsl_struct *info)
4119 {
4120 if (request_region(info->io_base,info->io_addr_size,"synclink") == NULL) {
4121 printk( "%s(%d):I/O address conflict on device %s Addr=%08X\n",
4122 __FILE__,__LINE__,info->device_name, info->io_base);
4123 return -ENODEV;
4124 }
4125 info->io_addr_requested = 1;
4126
4127 if ( request_irq(info->irq_level,mgsl_interrupt,info->irq_flags,
4128 info->device_name, info ) < 0 ) {
4129 printk( "%s(%d):Cant request interrupt on device %s IRQ=%d\n",
4130 __FILE__,__LINE__,info->device_name, info->irq_level );
4131 goto errout;
4132 }
4133 info->irq_requested = 1;
4134
4135 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4136 if (request_mem_region(info->phys_memory_base,0x40000,"synclink") == NULL) {
4137 printk( "%s(%d):mem addr conflict device %s Addr=%08X\n",
4138 __FILE__,__LINE__,info->device_name, info->phys_memory_base);
4139 goto errout;
4140 }
4141 info->shared_mem_requested = 1;
4142 if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclink") == NULL) {
4143 printk( "%s(%d):lcr mem addr conflict device %s Addr=%08X\n",
4144 __FILE__,__LINE__,info->device_name, info->phys_lcr_base + info->lcr_offset);
4145 goto errout;
4146 }
4147 info->lcr_mem_requested = 1;
4148
4149 info->memory_base = ioremap(info->phys_memory_base,0x40000);
4150 if (!info->memory_base) {
4151 printk( "%s(%d):Cant map shared memory on device %s MemAddr=%08X\n",
4152 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4153 goto errout;
4154 }
4155
4156 if ( !mgsl_memory_test(info) ) {
4157 printk( "%s(%d):Failed shared memory test %s MemAddr=%08X\n",
4158 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4159 goto errout;
4160 }
4161
4162 info->lcr_base = ioremap(info->phys_lcr_base,PAGE_SIZE) + info->lcr_offset;
4163 if (!info->lcr_base) {
4164 printk( "%s(%d):Cant map LCR memory on device %s MemAddr=%08X\n",
4165 __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
4166 goto errout;
4167 }
4168
4169 } else {
4170 /* claim DMA channel */
4171
4172 if (request_dma(info->dma_level,info->device_name) < 0){
4173 printk( "%s(%d):Cant request DMA channel on device %s DMA=%d\n",
4174 __FILE__,__LINE__,info->device_name, info->dma_level );
4175 mgsl_release_resources( info );
4176 return -ENODEV;
4177 }
4178 info->dma_requested = 1;
4179
4180 /* ISA adapter uses bus master DMA */
4181 set_dma_mode(info->dma_level,DMA_MODE_CASCADE);
4182 enable_dma(info->dma_level);
4183 }
4184
4185 if ( mgsl_allocate_dma_buffers(info) < 0 ) {
4186 printk( "%s(%d):Cant allocate DMA buffers on device %s DMA=%d\n",
4187 __FILE__,__LINE__,info->device_name, info->dma_level );
4188 goto errout;
4189 }
4190
4191 return 0;
4192 errout:
4193 mgsl_release_resources(info);
4194 return -ENODEV;
4195
4196 } /* end of mgsl_claim_resources() */
4197
4198 static void mgsl_release_resources(struct mgsl_struct *info)
4199 {
4200 if ( debug_level >= DEBUG_LEVEL_INFO )
4201 printk( "%s(%d):mgsl_release_resources(%s) entry\n",
4202 __FILE__,__LINE__,info->device_name );
4203
4204 if ( info->irq_requested ) {
4205 free_irq(info->irq_level, info);
4206 info->irq_requested = 0;
4207 }
4208 if ( info->dma_requested ) {
4209 disable_dma(info->dma_level);
4210 free_dma(info->dma_level);
4211 info->dma_requested = 0;
4212 }
4213 mgsl_free_dma_buffers(info);
4214 mgsl_free_intermediate_rxbuffer_memory(info);
4215 mgsl_free_intermediate_txbuffer_memory(info);
4216
4217 if ( info->io_addr_requested ) {
4218 release_region(info->io_base,info->io_addr_size);
4219 info->io_addr_requested = 0;
4220 }
4221 if ( info->shared_mem_requested ) {
4222 release_mem_region(info->phys_memory_base,0x40000);
4223 info->shared_mem_requested = 0;
4224 }
4225 if ( info->lcr_mem_requested ) {
4226 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
4227 info->lcr_mem_requested = 0;
4228 }
4229 if (info->memory_base){
4230 iounmap(info->memory_base);
4231 info->memory_base = NULL;
4232 }
4233 if (info->lcr_base){
4234 iounmap(info->lcr_base - info->lcr_offset);
4235 info->lcr_base = NULL;
4236 }
4237
4238 if ( debug_level >= DEBUG_LEVEL_INFO )
4239 printk( "%s(%d):mgsl_release_resources(%s) exit\n",
4240 __FILE__,__LINE__,info->device_name );
4241
4242 } /* end of mgsl_release_resources() */
4243
4244 /* mgsl_add_device()
4245 *
4246 * Add the specified device instance data structure to the
4247 * global linked list of devices and increment the device count.
4248 *
4249 * Arguments: info pointer to device instance data
4250 * Return Value: None
4251 */
4252 static void mgsl_add_device( struct mgsl_struct *info )
4253 {
4254 info->next_device = NULL;
4255 info->line = mgsl_device_count;
4256 sprintf(info->device_name,"ttySL%d",info->line);
4257
4258 if (info->line < MAX_TOTAL_DEVICES) {
4259 if (maxframe[info->line])
4260 info->max_frame_size = maxframe[info->line];
4261 info->dosyncppp = dosyncppp[info->line];
4262
4263 if (txdmabufs[info->line]) {
4264 info->num_tx_dma_buffers = txdmabufs[info->line];
4265 if (info->num_tx_dma_buffers < 1)
4266 info->num_tx_dma_buffers = 1;
4267 }
4268
4269 if (txholdbufs[info->line]) {
4270 info->num_tx_holding_buffers = txholdbufs[info->line];
4271 if (info->num_tx_holding_buffers < 1)
4272 info->num_tx_holding_buffers = 1;
4273 else if (info->num_tx_holding_buffers > MAX_TX_HOLDING_BUFFERS)
4274 info->num_tx_holding_buffers = MAX_TX_HOLDING_BUFFERS;
4275 }
4276 }
4277
4278 mgsl_device_count++;
4279
4280 if ( !mgsl_device_list )
4281 mgsl_device_list = info;
4282 else {
4283 struct mgsl_struct *current_dev = mgsl_device_list;
4284 while( current_dev->next_device )
4285 current_dev = current_dev->next_device;
4286 current_dev->next_device = info;
4287 }
4288
4289 if ( info->max_frame_size < 4096 )
4290 info->max_frame_size = 4096;
4291 else if ( info->max_frame_size > 65535 )
4292 info->max_frame_size = 65535;
4293
4294 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4295 printk( "SyncLink PCI v%d %s: IO=%04X IRQ=%d Mem=%08X,%08X MaxFrameSize=%u\n",
4296 info->hw_version + 1, info->device_name, info->io_base, info->irq_level,
4297 info->phys_memory_base, info->phys_lcr_base,
4298 info->max_frame_size );
4299 } else {
4300 printk( "SyncLink ISA %s: IO=%04X IRQ=%d DMA=%d MaxFrameSize=%u\n",
4301 info->device_name, info->io_base, info->irq_level, info->dma_level,
4302 info->max_frame_size );
4303 }
4304
4305 #if SYNCLINK_GENERIC_HDLC
4306 hdlcdev_init(info);
4307 #endif
4308
4309 } /* end of mgsl_add_device() */
4310
4311 /* mgsl_allocate_device()
4312 *
4313 * Allocate and initialize a device instance structure
4314 *
4315 * Arguments: none
4316 * Return Value: pointer to mgsl_struct if success, otherwise NULL
4317 */
4318 static struct mgsl_struct* mgsl_allocate_device(void)
4319 {
4320 struct mgsl_struct *info;
4321
4322 info = kzalloc(sizeof(struct mgsl_struct),
4323 GFP_KERNEL);
4324
4325 if (!info) {
4326 printk("Error can't allocate device instance data\n");
4327 } else {
4328 info->magic = MGSL_MAGIC;
4329 INIT_WORK(&info->task, mgsl_bh_handler);
4330 info->max_frame_size = 4096;
4331 info->close_delay = 5*HZ/10;
4332 info->closing_wait = 30*HZ;
4333 init_waitqueue_head(&info->open_wait);
4334 init_waitqueue_head(&info->close_wait);
4335 init_waitqueue_head(&info->status_event_wait_q);
4336 init_waitqueue_head(&info->event_wait_q);
4337 spin_lock_init(&info->irq_spinlock);
4338 spin_lock_init(&info->netlock);
4339 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
4340 info->idle_mode = HDLC_TXIDLE_FLAGS;
4341 info->num_tx_dma_buffers = 1;
4342 info->num_tx_holding_buffers = 0;
4343 }
4344
4345 return info;
4346
4347 } /* end of mgsl_allocate_device()*/
4348
4349 static const struct tty_operations mgsl_ops = {
4350 .open = mgsl_open,
4351 .close = mgsl_close,
4352 .write = mgsl_write,
4353 .put_char = mgsl_put_char,
4354 .flush_chars = mgsl_flush_chars,
4355 .write_room = mgsl_write_room,
4356 .chars_in_buffer = mgsl_chars_in_buffer,
4357 .flush_buffer = mgsl_flush_buffer,
4358 .ioctl = mgsl_ioctl,
4359 .throttle = mgsl_throttle,
4360 .unthrottle = mgsl_unthrottle,
4361 .send_xchar = mgsl_send_xchar,
4362 .break_ctl = mgsl_break,
4363 .wait_until_sent = mgsl_wait_until_sent,
4364 .read_proc = mgsl_read_proc,
4365 .set_termios = mgsl_set_termios,
4366 .stop = mgsl_stop,
4367 .start = mgsl_start,
4368 .hangup = mgsl_hangup,
4369 .tiocmget = tiocmget,
4370 .tiocmset = tiocmset,
4371 };
4372
4373 /*
4374 * perform tty device initialization
4375 */
4376 static int mgsl_init_tty(void)
4377 {
4378 int rc;
4379
4380 serial_driver = alloc_tty_driver(128);
4381 if (!serial_driver)
4382 return -ENOMEM;
4383
4384 serial_driver->owner = THIS_MODULE;
4385 serial_driver->driver_name = "synclink";
4386 serial_driver->name = "ttySL";
4387 serial_driver->major = ttymajor;
4388 serial_driver->minor_start = 64;
4389 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4390 serial_driver->subtype = SERIAL_TYPE_NORMAL;
4391 serial_driver->init_termios = tty_std_termios;
4392 serial_driver->init_termios.c_cflag =
4393 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4394 serial_driver->init_termios.c_ispeed = 9600;
4395 serial_driver->init_termios.c_ospeed = 9600;
4396 serial_driver->flags = TTY_DRIVER_REAL_RAW;
4397 tty_set_operations(serial_driver, &mgsl_ops);
4398 if ((rc = tty_register_driver(serial_driver)) < 0) {
4399 printk("%s(%d):Couldn't register serial driver\n",
4400 __FILE__,__LINE__);
4401 put_tty_driver(serial_driver);
4402 serial_driver = NULL;
4403 return rc;
4404 }
4405
4406 printk("%s %s, tty major#%d\n",
4407 driver_name, driver_version,
4408 serial_driver->major);
4409 return 0;
4410 }
4411
4412 /* enumerate user specified ISA adapters
4413 */
4414 static void mgsl_enum_isa_devices(void)
4415 {
4416 struct mgsl_struct *info;
4417 int i;
4418
4419 /* Check for user specified ISA devices */
4420
4421 for (i=0 ;(i < MAX_ISA_DEVICES) && io[i] && irq[i]; i++){
4422 if ( debug_level >= DEBUG_LEVEL_INFO )
4423 printk("ISA device specified io=%04X,irq=%d,dma=%d\n",
4424 io[i], irq[i], dma[i] );
4425
4426 info = mgsl_allocate_device();
4427 if ( !info ) {
4428 /* error allocating device instance data */
4429 if ( debug_level >= DEBUG_LEVEL_ERROR )
4430 printk( "can't allocate device instance data.\n");
4431 continue;
4432 }
4433
4434 /* Copy user configuration info to device instance data */
4435 info->io_base = (unsigned int)io[i];
4436 info->irq_level = (unsigned int)irq[i];
4437 info->irq_level = irq_canonicalize(info->irq_level);
4438 info->dma_level = (unsigned int)dma[i];
4439 info->bus_type = MGSL_BUS_TYPE_ISA;
4440 info->io_addr_size = 16;
4441 info->irq_flags = 0;
4442
4443 mgsl_add_device( info );
4444 }
4445 }
4446
4447 static void synclink_cleanup(void)
4448 {
4449 int rc;
4450 struct mgsl_struct *info;
4451 struct mgsl_struct *tmp;
4452
4453 printk("Unloading %s: %s\n", driver_name, driver_version);
4454
4455 if (serial_driver) {
4456 if ((rc = tty_unregister_driver(serial_driver)))
4457 printk("%s(%d) failed to unregister tty driver err=%d\n",
4458 __FILE__,__LINE__,rc);
4459 put_tty_driver(serial_driver);
4460 }
4461
4462 info = mgsl_device_list;
4463 while(info) {
4464 #if SYNCLINK_GENERIC_HDLC
4465 hdlcdev_exit(info);
4466 #endif
4467 mgsl_release_resources(info);
4468 tmp = info;
4469 info = info->next_device;
4470 kfree(tmp);
4471 }
4472
4473 if (pci_registered)
4474 pci_unregister_driver(&synclink_pci_driver);
4475 }
4476
4477 static int __init synclink_init(void)
4478 {
4479 int rc;
4480
4481 if (break_on_load) {
4482 mgsl_get_text_ptr();
4483 BREAKPOINT();
4484 }
4485
4486 printk("%s %s\n", driver_name, driver_version);
4487
4488 mgsl_enum_isa_devices();
4489 if ((rc = pci_register_driver(&synclink_pci_driver)) < 0)
4490 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
4491 else
4492 pci_registered = 1;
4493
4494 if ((rc = mgsl_init_tty()) < 0)
4495 goto error;
4496
4497 return 0;
4498
4499 error:
4500 synclink_cleanup();
4501 return rc;
4502 }
4503
4504 static void __exit synclink_exit(void)
4505 {
4506 synclink_cleanup();
4507 }
4508
4509 module_init(synclink_init);
4510 module_exit(synclink_exit);
4511
4512 /*
4513 * usc_RTCmd()
4514 *
4515 * Issue a USC Receive/Transmit command to the
4516 * Channel Command/Address Register (CCAR).
4517 *
4518 * Notes:
4519 *
4520 * The command is encoded in the most significant 5 bits <15..11>
4521 * of the CCAR value. Bits <10..7> of the CCAR must be preserved
4522 * and Bits <6..0> must be written as zeros.
4523 *
4524 * Arguments:
4525 *
4526 * info pointer to device information structure
4527 * Cmd command mask (use symbolic macros)
4528 *
4529 * Return Value:
4530 *
4531 * None
4532 */
4533 static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd )
4534 {
4535 /* output command to CCAR in bits <15..11> */
4536 /* preserve bits <10..7>, bits <6..0> must be zero */
4537
4538 outw( Cmd + info->loopback_bits, info->io_base + CCAR );
4539
4540 /* Read to flush write to CCAR */
4541 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4542 inw( info->io_base + CCAR );
4543
4544 } /* end of usc_RTCmd() */
4545
4546 /*
4547 * usc_DmaCmd()
4548 *
4549 * Issue a DMA command to the DMA Command/Address Register (DCAR).
4550 *
4551 * Arguments:
4552 *
4553 * info pointer to device information structure
4554 * Cmd DMA command mask (usc_DmaCmd_XX Macros)
4555 *
4556 * Return Value:
4557 *
4558 * None
4559 */
4560 static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd )
4561 {
4562 /* write command mask to DCAR */
4563 outw( Cmd + info->mbre_bit, info->io_base );
4564
4565 /* Read to flush write to DCAR */
4566 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4567 inw( info->io_base );
4568
4569 } /* end of usc_DmaCmd() */
4570
4571 /*
4572 * usc_OutDmaReg()
4573 *
4574 * Write a 16-bit value to a USC DMA register
4575 *
4576 * Arguments:
4577 *
4578 * info pointer to device info structure
4579 * RegAddr register address (number) for write
4580 * RegValue 16-bit value to write to register
4581 *
4582 * Return Value:
4583 *
4584 * None
4585 *
4586 */
4587 static void usc_OutDmaReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4588 {
4589 /* Note: The DCAR is located at the adapter base address */
4590 /* Note: must preserve state of BIT8 in DCAR */
4591
4592 outw( RegAddr + info->mbre_bit, info->io_base );
4593 outw( RegValue, info->io_base );
4594
4595 /* Read to flush write to DCAR */
4596 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4597 inw( info->io_base );
4598
4599 } /* end of usc_OutDmaReg() */
4600
4601 /*
4602 * usc_InDmaReg()
4603 *
4604 * Read a 16-bit value from a DMA register
4605 *
4606 * Arguments:
4607 *
4608 * info pointer to device info structure
4609 * RegAddr register address (number) to read from
4610 *
4611 * Return Value:
4612 *
4613 * The 16-bit value read from register
4614 *
4615 */
4616 static u16 usc_InDmaReg( struct mgsl_struct *info, u16 RegAddr )
4617 {
4618 /* Note: The DCAR is located at the adapter base address */
4619 /* Note: must preserve state of BIT8 in DCAR */
4620
4621 outw( RegAddr + info->mbre_bit, info->io_base );
4622 return inw( info->io_base );
4623
4624 } /* end of usc_InDmaReg() */
4625
4626 /*
4627 *
4628 * usc_OutReg()
4629 *
4630 * Write a 16-bit value to a USC serial channel register
4631 *
4632 * Arguments:
4633 *
4634 * info pointer to device info structure
4635 * RegAddr register address (number) to write to
4636 * RegValue 16-bit value to write to register
4637 *
4638 * Return Value:
4639 *
4640 * None
4641 *
4642 */
4643 static void usc_OutReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4644 {
4645 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4646 outw( RegValue, info->io_base + CCAR );
4647
4648 /* Read to flush write to CCAR */
4649 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4650 inw( info->io_base + CCAR );
4651
4652 } /* end of usc_OutReg() */
4653
4654 /*
4655 * usc_InReg()
4656 *
4657 * Reads a 16-bit value from a USC serial channel register
4658 *
4659 * Arguments:
4660 *
4661 * info pointer to device extension
4662 * RegAddr register address (number) to read from
4663 *
4664 * Return Value:
4665 *
4666 * 16-bit value read from register
4667 */
4668 static u16 usc_InReg( struct mgsl_struct *info, u16 RegAddr )
4669 {
4670 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4671 return inw( info->io_base + CCAR );
4672
4673 } /* end of usc_InReg() */
4674
4675 /* usc_set_sdlc_mode()
4676 *
4677 * Set up the adapter for SDLC DMA communications.
4678 *
4679 * Arguments: info pointer to device instance data
4680 * Return Value: NONE
4681 */
4682 static void usc_set_sdlc_mode( struct mgsl_struct *info )
4683 {
4684 u16 RegValue;
4685 int PreSL1660;
4686
4687 /*
4688 * determine if the IUSC on the adapter is pre-SL1660. If
4689 * not, take advantage of the UnderWait feature of more
4690 * modern chips. If an underrun occurs and this bit is set,
4691 * the transmitter will idle the programmed idle pattern
4692 * until the driver has time to service the underrun. Otherwise,
4693 * the dma controller may get the cycles previously requested
4694 * and begin transmitting queued tx data.
4695 */
4696 usc_OutReg(info,TMCR,0x1f);
4697 RegValue=usc_InReg(info,TMDR);
4698 if ( RegValue == IUSC_PRE_SL1660 )
4699 PreSL1660 = 1;
4700 else
4701 PreSL1660 = 0;
4702
4703
4704 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
4705 {
4706 /*
4707 ** Channel Mode Register (CMR)
4708 **
4709 ** <15..14> 10 Tx Sub Modes, Send Flag on Underrun
4710 ** <13> 0 0 = Transmit Disabled (initially)
4711 ** <12> 0 1 = Consecutive Idles share common 0
4712 ** <11..8> 1110 Transmitter Mode = HDLC/SDLC Loop
4713 ** <7..4> 0000 Rx Sub Modes, addr/ctrl field handling
4714 ** <3..0> 0110 Receiver Mode = HDLC/SDLC
4715 **
4716 ** 1000 1110 0000 0110 = 0x8e06
4717 */
4718 RegValue = 0x8e06;
4719
4720 /*--------------------------------------------------
4721 * ignore user options for UnderRun Actions and
4722 * preambles
4723 *--------------------------------------------------*/
4724 }
4725 else
4726 {
4727 /* Channel mode Register (CMR)
4728 *
4729 * <15..14> 00 Tx Sub modes, Underrun Action
4730 * <13> 0 1 = Send Preamble before opening flag
4731 * <12> 0 1 = Consecutive Idles share common 0
4732 * <11..8> 0110 Transmitter mode = HDLC/SDLC
4733 * <7..4> 0000 Rx Sub modes, addr/ctrl field handling
4734 * <3..0> 0110 Receiver mode = HDLC/SDLC
4735 *
4736 * 0000 0110 0000 0110 = 0x0606
4737 */
4738 if (info->params.mode == MGSL_MODE_RAW) {
4739 RegValue = 0x0001; /* Set Receive mode = external sync */
4740
4741 usc_OutReg( info, IOCR, /* Set IOCR DCD is RxSync Detect Input */
4742 (unsigned short)((usc_InReg(info, IOCR) & ~(BIT13|BIT12)) | BIT12));
4743
4744 /*
4745 * TxSubMode:
4746 * CMR <15> 0 Don't send CRC on Tx Underrun
4747 * CMR <14> x undefined
4748 * CMR <13> 0 Send preamble before openning sync
4749 * CMR <12> 0 Send 8-bit syncs, 1=send Syncs per TxLength
4750 *
4751 * TxMode:
4752 * CMR <11-8) 0100 MonoSync
4753 *
4754 * 0x00 0100 xxxx xxxx 04xx
4755 */
4756 RegValue |= 0x0400;
4757 }
4758 else {
4759
4760 RegValue = 0x0606;
4761
4762 if ( info->params.flags & HDLC_FLAG_UNDERRUN_ABORT15 )
4763 RegValue |= BIT14;
4764 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_FLAG )
4765 RegValue |= BIT15;
4766 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_CRC )
4767 RegValue |= BIT15 + BIT14;
4768 }
4769
4770 if ( info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE )
4771 RegValue |= BIT13;
4772 }
4773
4774 if ( info->params.mode == MGSL_MODE_HDLC &&
4775 (info->params.flags & HDLC_FLAG_SHARE_ZERO) )
4776 RegValue |= BIT12;
4777
4778 if ( info->params.addr_filter != 0xff )
4779 {
4780 /* set up receive address filtering */
4781 usc_OutReg( info, RSR, info->params.addr_filter );
4782 RegValue |= BIT4;
4783 }
4784
4785 usc_OutReg( info, CMR, RegValue );
4786 info->cmr_value = RegValue;
4787
4788 /* Receiver mode Register (RMR)
4789 *
4790 * <15..13> 000 encoding
4791 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4792 * <10> 1 1 = Set CRC to all 1s (use for SDLC/HDLC)
4793 * <9> 0 1 = Include Receive chars in CRC
4794 * <8> 1 1 = Use Abort/PE bit as abort indicator
4795 * <7..6> 00 Even parity
4796 * <5> 0 parity disabled
4797 * <4..2> 000 Receive Char Length = 8 bits
4798 * <1..0> 00 Disable Receiver
4799 *
4800 * 0000 0101 0000 0000 = 0x0500
4801 */
4802
4803 RegValue = 0x0500;
4804
4805 switch ( info->params.encoding ) {
4806 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4807 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4808 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4809 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4810 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4811 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4812 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4813 }
4814
4815 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4816 RegValue |= BIT9;
4817 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4818 RegValue |= ( BIT12 | BIT10 | BIT9 );
4819
4820 usc_OutReg( info, RMR, RegValue );
4821
4822 /* Set the Receive count Limit Register (RCLR) to 0xffff. */
4823 /* When an opening flag of an SDLC frame is recognized the */
4824 /* Receive Character count (RCC) is loaded with the value in */
4825 /* RCLR. The RCC is decremented for each received byte. The */
4826 /* value of RCC is stored after the closing flag of the frame */
4827 /* allowing the frame size to be computed. */
4828
4829 usc_OutReg( info, RCLR, RCLRVALUE );
4830
4831 usc_RCmd( info, RCmd_SelectRicrdma_level );
4832
4833 /* Receive Interrupt Control Register (RICR)
4834 *
4835 * <15..8> ? RxFIFO DMA Request Level
4836 * <7> 0 Exited Hunt IA (Interrupt Arm)
4837 * <6> 0 Idle Received IA
4838 * <5> 0 Break/Abort IA
4839 * <4> 0 Rx Bound IA
4840 * <3> 1 Queued status reflects oldest 2 bytes in FIFO
4841 * <2> 0 Abort/PE IA
4842 * <1> 1 Rx Overrun IA
4843 * <0> 0 Select TC0 value for readback
4844 *
4845 * 0000 0000 0000 1000 = 0x000a
4846 */
4847
4848 /* Carry over the Exit Hunt and Idle Received bits */
4849 /* in case they have been armed by usc_ArmEvents. */
4850
4851 RegValue = usc_InReg( info, RICR ) & 0xc0;
4852
4853 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4854 usc_OutReg( info, RICR, (u16)(0x030a | RegValue) );
4855 else
4856 usc_OutReg( info, RICR, (u16)(0x140a | RegValue) );
4857
4858 /* Unlatch all Rx status bits and clear Rx status IRQ Pending */
4859
4860 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
4861 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
4862
4863 /* Transmit mode Register (TMR)
4864 *
4865 * <15..13> 000 encoding
4866 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4867 * <10> 1 1 = Start CRC as all 1s (use for SDLC/HDLC)
4868 * <9> 0 1 = Tx CRC Enabled
4869 * <8> 0 1 = Append CRC to end of transmit frame
4870 * <7..6> 00 Transmit parity Even
4871 * <5> 0 Transmit parity Disabled
4872 * <4..2> 000 Tx Char Length = 8 bits
4873 * <1..0> 00 Disable Transmitter
4874 *
4875 * 0000 0100 0000 0000 = 0x0400
4876 */
4877
4878 RegValue = 0x0400;
4879
4880 switch ( info->params.encoding ) {
4881 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4882 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4883 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4884 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4885 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4886 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4887 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4888 }
4889
4890 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4891 RegValue |= BIT9 + BIT8;
4892 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4893 RegValue |= ( BIT12 | BIT10 | BIT9 | BIT8);
4894
4895 usc_OutReg( info, TMR, RegValue );
4896
4897 usc_set_txidle( info );
4898
4899
4900 usc_TCmd( info, TCmd_SelectTicrdma_level );
4901
4902 /* Transmit Interrupt Control Register (TICR)
4903 *
4904 * <15..8> ? Transmit FIFO DMA Level
4905 * <7> 0 Present IA (Interrupt Arm)
4906 * <6> 0 Idle Sent IA
4907 * <5> 1 Abort Sent IA
4908 * <4> 1 EOF/EOM Sent IA
4909 * <3> 0 CRC Sent IA
4910 * <2> 1 1 = Wait for SW Trigger to Start Frame
4911 * <1> 1 Tx Underrun IA
4912 * <0> 0 TC0 constant on read back
4913 *
4914 * 0000 0000 0011 0110 = 0x0036
4915 */
4916
4917 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4918 usc_OutReg( info, TICR, 0x0736 );
4919 else
4920 usc_OutReg( info, TICR, 0x1436 );
4921
4922 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
4923 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
4924
4925 /*
4926 ** Transmit Command/Status Register (TCSR)
4927 **
4928 ** <15..12> 0000 TCmd
4929 ** <11> 0/1 UnderWait
4930 ** <10..08> 000 TxIdle
4931 ** <7> x PreSent
4932 ** <6> x IdleSent
4933 ** <5> x AbortSent
4934 ** <4> x EOF/EOM Sent
4935 ** <3> x CRC Sent
4936 ** <2> x All Sent
4937 ** <1> x TxUnder
4938 ** <0> x TxEmpty
4939 **
4940 ** 0000 0000 0000 0000 = 0x0000
4941 */
4942 info->tcsr_value = 0;
4943
4944 if ( !PreSL1660 )
4945 info->tcsr_value |= TCSR_UNDERWAIT;
4946
4947 usc_OutReg( info, TCSR, info->tcsr_value );
4948
4949 /* Clock mode Control Register (CMCR)
4950 *
4951 * <15..14> 00 counter 1 Source = Disabled
4952 * <13..12> 00 counter 0 Source = Disabled
4953 * <11..10> 11 BRG1 Input is TxC Pin
4954 * <9..8> 11 BRG0 Input is TxC Pin
4955 * <7..6> 01 DPLL Input is BRG1 Output
4956 * <5..3> XXX TxCLK comes from Port 0
4957 * <2..0> XXX RxCLK comes from Port 1
4958 *
4959 * 0000 1111 0111 0111 = 0x0f77
4960 */
4961
4962 RegValue = 0x0f40;
4963
4964 if ( info->params.flags & HDLC_FLAG_RXC_DPLL )
4965 RegValue |= 0x0003; /* RxCLK from DPLL */
4966 else if ( info->params.flags & HDLC_FLAG_RXC_BRG )
4967 RegValue |= 0x0004; /* RxCLK from BRG0 */
4968 else if ( info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4969 RegValue |= 0x0006; /* RxCLK from TXC Input */
4970 else
4971 RegValue |= 0x0007; /* RxCLK from Port1 */
4972
4973 if ( info->params.flags & HDLC_FLAG_TXC_DPLL )
4974 RegValue |= 0x0018; /* TxCLK from DPLL */
4975 else if ( info->params.flags & HDLC_FLAG_TXC_BRG )
4976 RegValue |= 0x0020; /* TxCLK from BRG0 */
4977 else if ( info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4978 RegValue |= 0x0038; /* RxCLK from TXC Input */
4979 else
4980 RegValue |= 0x0030; /* TxCLK from Port0 */
4981
4982 usc_OutReg( info, CMCR, RegValue );
4983
4984
4985 /* Hardware Configuration Register (HCR)
4986 *
4987 * <15..14> 00 CTR0 Divisor:00=32,01=16,10=8,11=4
4988 * <13> 0 CTR1DSel:0=CTR0Div determines CTR0Div
4989 * <12> 0 CVOK:0=report code violation in biphase
4990 * <11..10> 00 DPLL Divisor:00=32,01=16,10=8,11=4
4991 * <9..8> XX DPLL mode:00=disable,01=NRZ,10=Biphase,11=Biphase Level
4992 * <7..6> 00 reserved
4993 * <5> 0 BRG1 mode:0=continuous,1=single cycle
4994 * <4> X BRG1 Enable
4995 * <3..2> 00 reserved
4996 * <1> 0 BRG0 mode:0=continuous,1=single cycle
4997 * <0> 0 BRG0 Enable
4998 */
4999
5000 RegValue = 0x0000;
5001
5002 if ( info->params.flags & (HDLC_FLAG_RXC_DPLL + HDLC_FLAG_TXC_DPLL) ) {
5003 u32 XtalSpeed;
5004 u32 DpllDivisor;
5005 u16 Tc;
5006
5007 /* DPLL is enabled. Use BRG1 to provide continuous reference clock */
5008 /* for DPLL. DPLL mode in HCR is dependent on the encoding used. */
5009
5010 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
5011 XtalSpeed = 11059200;
5012 else
5013 XtalSpeed = 14745600;
5014
5015 if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
5016 DpllDivisor = 16;
5017 RegValue |= BIT10;
5018 }
5019 else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
5020 DpllDivisor = 8;
5021 RegValue |= BIT11;
5022 }
5023 else
5024 DpllDivisor = 32;
5025
5026 /* Tc = (Xtal/Speed) - 1 */
5027 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
5028 /* then rounding up gives a more precise time constant. Instead */
5029 /* of rounding up and then subtracting 1 we just don't subtract */
5030 /* the one in this case. */
5031
5032 /*--------------------------------------------------
5033 * ejz: for DPLL mode, application should use the
5034 * same clock speed as the partner system, even
5035 * though clocking is derived from the input RxData.
5036 * In case the user uses a 0 for the clock speed,
5037 * default to 0xffffffff and don't try to divide by
5038 * zero
5039 *--------------------------------------------------*/
5040 if ( info->params.clock_speed )
5041 {
5042 Tc = (u16)((XtalSpeed/DpllDivisor)/info->params.clock_speed);
5043 if ( !((((XtalSpeed/DpllDivisor) % info->params.clock_speed) * 2)
5044 / info->params.clock_speed) )
5045 Tc--;
5046 }
5047 else
5048 Tc = -1;
5049
5050
5051 /* Write 16-bit Time Constant for BRG1 */
5052 usc_OutReg( info, TC1R, Tc );
5053
5054 RegValue |= BIT4; /* enable BRG1 */
5055
5056 switch ( info->params.encoding ) {
5057 case HDLC_ENCODING_NRZ:
5058 case HDLC_ENCODING_NRZB:
5059 case HDLC_ENCODING_NRZI_MARK:
5060 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT8; break;
5061 case HDLC_ENCODING_BIPHASE_MARK:
5062 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT9; break;
5063 case HDLC_ENCODING_BIPHASE_LEVEL:
5064 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT9 + BIT8; break;
5065 }
5066 }
5067
5068 usc_OutReg( info, HCR, RegValue );
5069
5070
5071 /* Channel Control/status Register (CCSR)
5072 *
5073 * <15> X RCC FIFO Overflow status (RO)
5074 * <14> X RCC FIFO Not Empty status (RO)
5075 * <13> 0 1 = Clear RCC FIFO (WO)
5076 * <12> X DPLL Sync (RW)
5077 * <11> X DPLL 2 Missed Clocks status (RO)
5078 * <10> X DPLL 1 Missed Clock status (RO)
5079 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
5080 * <7> X SDLC Loop On status (RO)
5081 * <6> X SDLC Loop Send status (RO)
5082 * <5> 1 Bypass counters for TxClk and RxClk (RW)
5083 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
5084 * <1..0> 00 reserved
5085 *
5086 * 0000 0000 0010 0000 = 0x0020
5087 */
5088
5089 usc_OutReg( info, CCSR, 0x1020 );
5090
5091
5092 if ( info->params.flags & HDLC_FLAG_AUTO_CTS ) {
5093 usc_OutReg( info, SICR,
5094 (u16)(usc_InReg(info,SICR) | SICR_CTS_INACTIVE) );
5095 }
5096
5097
5098 /* enable Master Interrupt Enable bit (MIE) */
5099 usc_EnableMasterIrqBit( info );
5100
5101 usc_ClearIrqPendingBits( info, RECEIVE_STATUS + RECEIVE_DATA +
5102 TRANSMIT_STATUS + TRANSMIT_DATA + MISC);
5103
5104 /* arm RCC underflow interrupt */
5105 usc_OutReg(info, SICR, (u16)(usc_InReg(info,SICR) | BIT3));
5106 usc_EnableInterrupts(info, MISC);
5107
5108 info->mbre_bit = 0;
5109 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5110 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5111 info->mbre_bit = BIT8;
5112 outw( BIT8, info->io_base ); /* set Master Bus Enable (DCAR) */
5113
5114 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
5115 /* Enable DMAEN (Port 7, Bit 14) */
5116 /* This connects the DMA request signal to the ISA bus */
5117 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) & ~BIT14));
5118 }
5119
5120 /* DMA Control Register (DCR)
5121 *
5122 * <15..14> 10 Priority mode = Alternating Tx/Rx
5123 * 01 Rx has priority
5124 * 00 Tx has priority
5125 *
5126 * <13> 1 Enable Priority Preempt per DCR<15..14>
5127 * (WARNING DCR<11..10> must be 00 when this is 1)
5128 * 0 Choose activate channel per DCR<11..10>
5129 *
5130 * <12> 0 Little Endian for Array/List
5131 * <11..10> 00 Both Channels can use each bus grant
5132 * <9..6> 0000 reserved
5133 * <5> 0 7 CLK - Minimum Bus Re-request Interval
5134 * <4> 0 1 = drive D/C and S/D pins
5135 * <3> 1 1 = Add one wait state to all DMA cycles.
5136 * <2> 0 1 = Strobe /UAS on every transfer.
5137 * <1..0> 11 Addr incrementing only affects LS24 bits
5138 *
5139 * 0110 0000 0000 1011 = 0x600b
5140 */
5141
5142 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5143 /* PCI adapter does not need DMA wait state */
5144 usc_OutDmaReg( info, DCR, 0xa00b );
5145 }
5146 else
5147 usc_OutDmaReg( info, DCR, 0x800b );
5148
5149
5150 /* Receive DMA mode Register (RDMR)
5151 *
5152 * <15..14> 11 DMA mode = Linked List Buffer mode
5153 * <13> 1 RSBinA/L = store Rx status Block in Arrary/List entry
5154 * <12> 1 Clear count of List Entry after fetching
5155 * <11..10> 00 Address mode = Increment
5156 * <9> 1 Terminate Buffer on RxBound
5157 * <8> 0 Bus Width = 16bits
5158 * <7..0> ? status Bits (write as 0s)
5159 *
5160 * 1111 0010 0000 0000 = 0xf200
5161 */
5162
5163 usc_OutDmaReg( info, RDMR, 0xf200 );
5164
5165
5166 /* Transmit DMA mode Register (TDMR)
5167 *
5168 * <15..14> 11 DMA mode = Linked List Buffer mode
5169 * <13> 1 TCBinA/L = fetch Tx Control Block from List entry
5170 * <12> 1 Clear count of List Entry after fetching
5171 * <11..10> 00 Address mode = Increment
5172 * <9> 1 Terminate Buffer on end of frame
5173 * <8> 0 Bus Width = 16bits
5174 * <7..0> ? status Bits (Read Only so write as 0)
5175 *
5176 * 1111 0010 0000 0000 = 0xf200
5177 */
5178
5179 usc_OutDmaReg( info, TDMR, 0xf200 );
5180
5181
5182 /* DMA Interrupt Control Register (DICR)
5183 *
5184 * <15> 1 DMA Interrupt Enable
5185 * <14> 0 1 = Disable IEO from USC
5186 * <13> 0 1 = Don't provide vector during IntAck
5187 * <12> 1 1 = Include status in Vector
5188 * <10..2> 0 reserved, Must be 0s
5189 * <1> 0 1 = Rx DMA Interrupt Enabled
5190 * <0> 0 1 = Tx DMA Interrupt Enabled
5191 *
5192 * 1001 0000 0000 0000 = 0x9000
5193 */
5194
5195 usc_OutDmaReg( info, DICR, 0x9000 );
5196
5197 usc_InDmaReg( info, RDMR ); /* clear pending receive DMA IRQ bits */
5198 usc_InDmaReg( info, TDMR ); /* clear pending transmit DMA IRQ bits */
5199 usc_OutDmaReg( info, CDIR, 0x0303 ); /* clear IUS and Pending for Tx and Rx */
5200
5201 /* Channel Control Register (CCR)
5202 *
5203 * <15..14> 10 Use 32-bit Tx Control Blocks (TCBs)
5204 * <13> 0 Trigger Tx on SW Command Disabled
5205 * <12> 0 Flag Preamble Disabled
5206 * <11..10> 00 Preamble Length
5207 * <9..8> 00 Preamble Pattern
5208 * <7..6> 10 Use 32-bit Rx status Blocks (RSBs)
5209 * <5> 0 Trigger Rx on SW Command Disabled
5210 * <4..0> 0 reserved
5211 *
5212 * 1000 0000 1000 0000 = 0x8080
5213 */
5214
5215 RegValue = 0x8080;
5216
5217 switch ( info->params.preamble_length ) {
5218 case HDLC_PREAMBLE_LENGTH_16BITS: RegValue |= BIT10; break;
5219 case HDLC_PREAMBLE_LENGTH_32BITS: RegValue |= BIT11; break;
5220 case HDLC_PREAMBLE_LENGTH_64BITS: RegValue |= BIT11 + BIT10; break;
5221 }
5222
5223 switch ( info->params.preamble ) {
5224 case HDLC_PREAMBLE_PATTERN_FLAGS: RegValue |= BIT8 + BIT12; break;
5225 case HDLC_PREAMBLE_PATTERN_ONES: RegValue |= BIT8; break;
5226 case HDLC_PREAMBLE_PATTERN_10: RegValue |= BIT9; break;
5227 case HDLC_PREAMBLE_PATTERN_01: RegValue |= BIT9 + BIT8; break;
5228 }
5229
5230 usc_OutReg( info, CCR, RegValue );
5231
5232
5233 /*
5234 * Burst/Dwell Control Register
5235 *
5236 * <15..8> 0x20 Maximum number of transfers per bus grant
5237 * <7..0> 0x00 Maximum number of clock cycles per bus grant
5238 */
5239
5240 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5241 /* don't limit bus occupancy on PCI adapter */
5242 usc_OutDmaReg( info, BDCR, 0x0000 );
5243 }
5244 else
5245 usc_OutDmaReg( info, BDCR, 0x2000 );
5246
5247 usc_stop_transmitter(info);
5248 usc_stop_receiver(info);
5249
5250 } /* end of usc_set_sdlc_mode() */
5251
5252 /* usc_enable_loopback()
5253 *
5254 * Set the 16C32 for internal loopback mode.
5255 * The TxCLK and RxCLK signals are generated from the BRG0 and
5256 * the TxD is looped back to the RxD internally.
5257 *
5258 * Arguments: info pointer to device instance data
5259 * enable 1 = enable loopback, 0 = disable
5260 * Return Value: None
5261 */
5262 static void usc_enable_loopback(struct mgsl_struct *info, int enable)
5263 {
5264 if (enable) {
5265 /* blank external TXD output */
5266 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) | (BIT7+BIT6));
5267
5268 /* Clock mode Control Register (CMCR)
5269 *
5270 * <15..14> 00 counter 1 Disabled
5271 * <13..12> 00 counter 0 Disabled
5272 * <11..10> 11 BRG1 Input is TxC Pin
5273 * <9..8> 11 BRG0 Input is TxC Pin
5274 * <7..6> 01 DPLL Input is BRG1 Output
5275 * <5..3> 100 TxCLK comes from BRG0
5276 * <2..0> 100 RxCLK comes from BRG0
5277 *
5278 * 0000 1111 0110 0100 = 0x0f64
5279 */
5280
5281 usc_OutReg( info, CMCR, 0x0f64 );
5282
5283 /* Write 16-bit Time Constant for BRG0 */
5284 /* use clock speed if available, otherwise use 8 for diagnostics */
5285 if (info->params.clock_speed) {
5286 if (info->bus_type == MGSL_BUS_TYPE_PCI)
5287 usc_OutReg(info, TC0R, (u16)((11059200/info->params.clock_speed)-1));
5288 else
5289 usc_OutReg(info, TC0R, (u16)((14745600/info->params.clock_speed)-1));
5290 } else
5291 usc_OutReg(info, TC0R, (u16)8);
5292
5293 /* Hardware Configuration Register (HCR) Clear Bit 1, BRG0
5294 mode = Continuous Set Bit 0 to enable BRG0. */
5295 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5296
5297 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5298 usc_OutReg(info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004));
5299
5300 /* set Internal Data loopback mode */
5301 info->loopback_bits = 0x300;
5302 outw( 0x0300, info->io_base + CCAR );
5303 } else {
5304 /* enable external TXD output */
5305 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) & ~(BIT7+BIT6));
5306
5307 /* clear Internal Data loopback mode */
5308 info->loopback_bits = 0;
5309 outw( 0,info->io_base + CCAR );
5310 }
5311
5312 } /* end of usc_enable_loopback() */
5313
5314 /* usc_enable_aux_clock()
5315 *
5316 * Enabled the AUX clock output at the specified frequency.
5317 *
5318 * Arguments:
5319 *
5320 * info pointer to device extension
5321 * data_rate data rate of clock in bits per second
5322 * A data rate of 0 disables the AUX clock.
5323 *
5324 * Return Value: None
5325 */
5326 static void usc_enable_aux_clock( struct mgsl_struct *info, u32 data_rate )
5327 {
5328 u32 XtalSpeed;
5329 u16 Tc;
5330
5331 if ( data_rate ) {
5332 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
5333 XtalSpeed = 11059200;
5334 else
5335 XtalSpeed = 14745600;
5336
5337
5338 /* Tc = (Xtal/Speed) - 1 */
5339 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
5340 /* then rounding up gives a more precise time constant. Instead */
5341 /* of rounding up and then subtracting 1 we just don't subtract */
5342 /* the one in this case. */
5343
5344
5345 Tc = (u16)(XtalSpeed/data_rate);
5346 if ( !(((XtalSpeed % data_rate) * 2) / data_rate) )
5347 Tc--;
5348
5349 /* Write 16-bit Time Constant for BRG0 */
5350 usc_OutReg( info, TC0R, Tc );
5351
5352 /*
5353 * Hardware Configuration Register (HCR)
5354 * Clear Bit 1, BRG0 mode = Continuous
5355 * Set Bit 0 to enable BRG0.
5356 */
5357
5358 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5359
5360 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5361 usc_OutReg( info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
5362 } else {
5363 /* data rate == 0 so turn off BRG0 */
5364 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
5365 }
5366
5367 } /* end of usc_enable_aux_clock() */
5368
5369 /*
5370 *
5371 * usc_process_rxoverrun_sync()
5372 *
5373 * This function processes a receive overrun by resetting the
5374 * receive DMA buffers and issuing a Purge Rx FIFO command
5375 * to allow the receiver to continue receiving.
5376 *
5377 * Arguments:
5378 *
5379 * info pointer to device extension
5380 *
5381 * Return Value: None
5382 */
5383 static void usc_process_rxoverrun_sync( struct mgsl_struct *info )
5384 {
5385 int start_index;
5386 int end_index;
5387 int frame_start_index;
5388 int start_of_frame_found = FALSE;
5389 int end_of_frame_found = FALSE;
5390 int reprogram_dma = FALSE;
5391
5392 DMABUFFERENTRY *buffer_list = info->rx_buffer_list;
5393 u32 phys_addr;
5394
5395 usc_DmaCmd( info, DmaCmd_PauseRxChannel );
5396 usc_RCmd( info, RCmd_EnterHuntmode );
5397 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5398
5399 /* CurrentRxBuffer points to the 1st buffer of the next */
5400 /* possibly available receive frame. */
5401
5402 frame_start_index = start_index = end_index = info->current_rx_buffer;
5403
5404 /* Search for an unfinished string of buffers. This means */
5405 /* that a receive frame started (at least one buffer with */
5406 /* count set to zero) but there is no terminiting buffer */
5407 /* (status set to non-zero). */
5408
5409 while( !buffer_list[end_index].count )
5410 {
5411 /* Count field has been reset to zero by 16C32. */
5412 /* This buffer is currently in use. */
5413
5414 if ( !start_of_frame_found )
5415 {
5416 start_of_frame_found = TRUE;
5417 frame_start_index = end_index;
5418 end_of_frame_found = FALSE;
5419 }
5420
5421 if ( buffer_list[end_index].status )
5422 {
5423 /* Status field has been set by 16C32. */
5424 /* This is the last buffer of a received frame. */
5425
5426 /* We want to leave the buffers for this frame intact. */
5427 /* Move on to next possible frame. */
5428
5429 start_of_frame_found = FALSE;
5430 end_of_frame_found = TRUE;
5431 }
5432
5433 /* advance to next buffer entry in linked list */
5434 end_index++;
5435 if ( end_index == info->rx_buffer_count )
5436 end_index = 0;
5437
5438 if ( start_index == end_index )
5439 {
5440 /* The entire list has been searched with all Counts == 0 and */
5441 /* all Status == 0. The receive buffers are */
5442 /* completely screwed, reset all receive buffers! */
5443 mgsl_reset_rx_dma_buffers( info );
5444 frame_start_index = 0;
5445 start_of_frame_found = FALSE;
5446 reprogram_dma = TRUE;
5447 break;
5448 }
5449 }
5450
5451 if ( start_of_frame_found && !end_of_frame_found )
5452 {
5453 /* There is an unfinished string of receive DMA buffers */
5454 /* as a result of the receiver overrun. */
5455
5456 /* Reset the buffers for the unfinished frame */
5457 /* and reprogram the receive DMA controller to start */
5458 /* at the 1st buffer of unfinished frame. */
5459
5460 start_index = frame_start_index;
5461
5462 do
5463 {
5464 *((unsigned long *)&(info->rx_buffer_list[start_index++].count)) = DMABUFFERSIZE;
5465
5466 /* Adjust index for wrap around. */
5467 if ( start_index == info->rx_buffer_count )
5468 start_index = 0;
5469
5470 } while( start_index != end_index );
5471
5472 reprogram_dma = TRUE;
5473 }
5474
5475 if ( reprogram_dma )
5476 {
5477 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
5478 usc_ClearIrqPendingBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5479 usc_UnlatchRxstatusBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5480
5481 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5482
5483 /* This empties the receive FIFO and loads the RCC with RCLR */
5484 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5485
5486 /* program 16C32 with physical address of 1st DMA buffer entry */
5487 phys_addr = info->rx_buffer_list[frame_start_index].phys_entry;
5488 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5489 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5490
5491 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5492 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5493 usc_EnableInterrupts( info, RECEIVE_STATUS );
5494
5495 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5496 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5497
5498 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5499 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5500 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5501 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5502 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5503 else
5504 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5505 }
5506 else
5507 {
5508 /* This empties the receive FIFO and loads the RCC with RCLR */
5509 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5510 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5511 }
5512
5513 } /* end of usc_process_rxoverrun_sync() */
5514
5515 /* usc_stop_receiver()
5516 *
5517 * Disable USC receiver
5518 *
5519 * Arguments: info pointer to device instance data
5520 * Return Value: None
5521 */
5522 static void usc_stop_receiver( struct mgsl_struct *info )
5523 {
5524 if (debug_level >= DEBUG_LEVEL_ISR)
5525 printk("%s(%d):usc_stop_receiver(%s)\n",
5526 __FILE__,__LINE__, info->device_name );
5527
5528 /* Disable receive DMA channel. */
5529 /* This also disables receive DMA channel interrupts */
5530 usc_DmaCmd( info, DmaCmd_ResetRxChannel );
5531
5532 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5533 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5534 usc_DisableInterrupts( info, RECEIVE_DATA + RECEIVE_STATUS );
5535
5536 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5537
5538 /* This empties the receive FIFO and loads the RCC with RCLR */
5539 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5540 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5541
5542 info->rx_enabled = 0;
5543 info->rx_overflow = 0;
5544 info->rx_rcc_underrun = 0;
5545
5546 } /* end of stop_receiver() */
5547
5548 /* usc_start_receiver()
5549 *
5550 * Enable the USC receiver
5551 *
5552 * Arguments: info pointer to device instance data
5553 * Return Value: None
5554 */
5555 static void usc_start_receiver( struct mgsl_struct *info )
5556 {
5557 u32 phys_addr;
5558
5559 if (debug_level >= DEBUG_LEVEL_ISR)
5560 printk("%s(%d):usc_start_receiver(%s)\n",
5561 __FILE__,__LINE__, info->device_name );
5562
5563 mgsl_reset_rx_dma_buffers( info );
5564 usc_stop_receiver( info );
5565
5566 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5567 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5568
5569 if ( info->params.mode == MGSL_MODE_HDLC ||
5570 info->params.mode == MGSL_MODE_RAW ) {
5571 /* DMA mode Transfers */
5572 /* Program the DMA controller. */
5573 /* Enable the DMA controller end of buffer interrupt. */
5574
5575 /* program 16C32 with physical address of 1st DMA buffer entry */
5576 phys_addr = info->rx_buffer_list[0].phys_entry;
5577 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5578 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5579
5580 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5581 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5582 usc_EnableInterrupts( info, RECEIVE_STATUS );
5583
5584 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5585 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5586
5587 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5588 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5589 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5590 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5591 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5592 else
5593 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5594 } else {
5595 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
5596 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
5597 usc_EnableInterrupts(info, RECEIVE_DATA);
5598
5599 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5600 usc_RCmd( info, RCmd_EnterHuntmode );
5601
5602 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5603 }
5604
5605 usc_OutReg( info, CCSR, 0x1020 );
5606
5607 info->rx_enabled = 1;
5608
5609 } /* end of usc_start_receiver() */
5610
5611 /* usc_start_transmitter()
5612 *
5613 * Enable the USC transmitter and send a transmit frame if
5614 * one is loaded in the DMA buffers.
5615 *
5616 * Arguments: info pointer to device instance data
5617 * Return Value: None
5618 */
5619 static void usc_start_transmitter( struct mgsl_struct *info )
5620 {
5621 u32 phys_addr;
5622 unsigned int FrameSize;
5623
5624 if (debug_level >= DEBUG_LEVEL_ISR)
5625 printk("%s(%d):usc_start_transmitter(%s)\n",
5626 __FILE__,__LINE__, info->device_name );
5627
5628 if ( info->xmit_cnt ) {
5629
5630 /* If auto RTS enabled and RTS is inactive, then assert */
5631 /* RTS and set a flag indicating that the driver should */
5632 /* negate RTS when the transmission completes. */
5633
5634 info->drop_rts_on_tx_done = 0;
5635
5636 if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
5637 usc_get_serial_signals( info );
5638 if ( !(info->serial_signals & SerialSignal_RTS) ) {
5639 info->serial_signals |= SerialSignal_RTS;
5640 usc_set_serial_signals( info );
5641 info->drop_rts_on_tx_done = 1;
5642 }
5643 }
5644
5645
5646 if ( info->params.mode == MGSL_MODE_ASYNC ) {
5647 if ( !info->tx_active ) {
5648 usc_UnlatchTxstatusBits(info, TXSTATUS_ALL);
5649 usc_ClearIrqPendingBits(info, TRANSMIT_STATUS + TRANSMIT_DATA);
5650 usc_EnableInterrupts(info, TRANSMIT_DATA);
5651 usc_load_txfifo(info);
5652 }
5653 } else {
5654 /* Disable transmit DMA controller while programming. */
5655 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5656
5657 /* Transmit DMA buffer is loaded, so program USC */
5658 /* to send the frame contained in the buffers. */
5659
5660 FrameSize = info->tx_buffer_list[info->start_tx_dma_buffer].rcc;
5661
5662 /* if operating in Raw sync mode, reset the rcc component
5663 * of the tx dma buffer entry, otherwise, the serial controller
5664 * will send a closing sync char after this count.
5665 */
5666 if ( info->params.mode == MGSL_MODE_RAW )
5667 info->tx_buffer_list[info->start_tx_dma_buffer].rcc = 0;
5668
5669 /* Program the Transmit Character Length Register (TCLR) */
5670 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
5671 usc_OutReg( info, TCLR, (u16)FrameSize );
5672
5673 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5674
5675 /* Program the address of the 1st DMA Buffer Entry in linked list */
5676 phys_addr = info->tx_buffer_list[info->start_tx_dma_buffer].phys_entry;
5677 usc_OutDmaReg( info, NTARL, (u16)phys_addr );
5678 usc_OutDmaReg( info, NTARU, (u16)(phys_addr >> 16) );
5679
5680 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5681 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
5682 usc_EnableInterrupts( info, TRANSMIT_STATUS );
5683
5684 if ( info->params.mode == MGSL_MODE_RAW &&
5685 info->num_tx_dma_buffers > 1 ) {
5686 /* When running external sync mode, attempt to 'stream' transmit */
5687 /* by filling tx dma buffers as they become available. To do this */
5688 /* we need to enable Tx DMA EOB Status interrupts : */
5689 /* */
5690 /* 1. Arm End of Buffer (EOB) Transmit DMA Interrupt (BIT2 of TDIAR) */
5691 /* 2. Enable Transmit DMA Interrupts (BIT0 of DICR) */
5692
5693 usc_OutDmaReg( info, TDIAR, BIT2|BIT3 );
5694 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT0) );
5695 }
5696
5697 /* Initialize Transmit DMA Channel */
5698 usc_DmaCmd( info, DmaCmd_InitTxChannel );
5699
5700 usc_TCmd( info, TCmd_SendFrame );
5701
5702 mod_timer(&info->tx_timer, jiffies +
5703 msecs_to_jiffies(5000));
5704 }
5705 info->tx_active = 1;
5706 }
5707
5708 if ( !info->tx_enabled ) {
5709 info->tx_enabled = 1;
5710 if ( info->params.flags & HDLC_FLAG_AUTO_CTS )
5711 usc_EnableTransmitter(info,ENABLE_AUTO_CTS);
5712 else
5713 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
5714 }
5715
5716 } /* end of usc_start_transmitter() */
5717
5718 /* usc_stop_transmitter()
5719 *
5720 * Stops the transmitter and DMA
5721 *
5722 * Arguments: info pointer to device isntance data
5723 * Return Value: None
5724 */
5725 static void usc_stop_transmitter( struct mgsl_struct *info )
5726 {
5727 if (debug_level >= DEBUG_LEVEL_ISR)
5728 printk("%s(%d):usc_stop_transmitter(%s)\n",
5729 __FILE__,__LINE__, info->device_name );
5730
5731 del_timer(&info->tx_timer);
5732
5733 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5734 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5735 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5736
5737 usc_EnableTransmitter(info,DISABLE_UNCONDITIONAL);
5738 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5739 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5740
5741 info->tx_enabled = 0;
5742 info->tx_active = 0;
5743
5744 } /* end of usc_stop_transmitter() */
5745
5746 /* usc_load_txfifo()
5747 *
5748 * Fill the transmit FIFO until the FIFO is full or
5749 * there is no more data to load.
5750 *
5751 * Arguments: info pointer to device extension (instance data)
5752 * Return Value: None
5753 */
5754 static void usc_load_txfifo( struct mgsl_struct *info )
5755 {
5756 int Fifocount;
5757 u8 TwoBytes[2];
5758
5759 if ( !info->xmit_cnt && !info->x_char )
5760 return;
5761
5762 /* Select transmit FIFO status readback in TICR */
5763 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
5764
5765 /* load the Transmit FIFO until FIFOs full or all data sent */
5766
5767 while( (Fifocount = usc_InReg(info, TICR) >> 8) && info->xmit_cnt ) {
5768 /* there is more space in the transmit FIFO and */
5769 /* there is more data in transmit buffer */
5770
5771 if ( (info->xmit_cnt > 1) && (Fifocount > 1) && !info->x_char ) {
5772 /* write a 16-bit word from transmit buffer to 16C32 */
5773
5774 TwoBytes[0] = info->xmit_buf[info->xmit_tail++];
5775 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5776 TwoBytes[1] = info->xmit_buf[info->xmit_tail++];
5777 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5778
5779 outw( *((u16 *)TwoBytes), info->io_base + DATAREG);
5780
5781 info->xmit_cnt -= 2;
5782 info->icount.tx += 2;
5783 } else {
5784 /* only 1 byte left to transmit or 1 FIFO slot left */
5785
5786 outw( (inw( info->io_base + CCAR) & 0x0780) | (TDR+LSBONLY),
5787 info->io_base + CCAR );
5788
5789 if (info->x_char) {
5790 /* transmit pending high priority char */
5791 outw( info->x_char,info->io_base + CCAR );
5792 info->x_char = 0;
5793 } else {
5794 outw( info->xmit_buf[info->xmit_tail++],info->io_base + CCAR );
5795 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5796 info->xmit_cnt--;
5797 }
5798 info->icount.tx++;
5799 }
5800 }
5801
5802 } /* end of usc_load_txfifo() */
5803
5804 /* usc_reset()
5805 *
5806 * Reset the adapter to a known state and prepare it for further use.
5807 *
5808 * Arguments: info pointer to device instance data
5809 * Return Value: None
5810 */
5811 static void usc_reset( struct mgsl_struct *info )
5812 {
5813 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5814 int i;
5815 u32 readval;
5816
5817 /* Set BIT30 of Misc Control Register */
5818 /* (Local Control Register 0x50) to force reset of USC. */
5819
5820 volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5821 u32 *LCR0BRDR = (u32 *)(info->lcr_base + 0x28);
5822
5823 info->misc_ctrl_value |= BIT30;
5824 *MiscCtrl = info->misc_ctrl_value;
5825
5826 /*
5827 * Force at least 170ns delay before clearing
5828 * reset bit. Each read from LCR takes at least
5829 * 30ns so 10 times for 300ns to be safe.
5830 */
5831 for(i=0;i<10;i++)
5832 readval = *MiscCtrl;
5833
5834 info->misc_ctrl_value &= ~BIT30;
5835 *MiscCtrl = info->misc_ctrl_value;
5836
5837 *LCR0BRDR = BUS_DESCRIPTOR(
5838 1, // Write Strobe Hold (0-3)
5839 2, // Write Strobe Delay (0-3)
5840 2, // Read Strobe Delay (0-3)
5841 0, // NWDD (Write data-data) (0-3)
5842 4, // NWAD (Write Addr-data) (0-31)
5843 0, // NXDA (Read/Write Data-Addr) (0-3)
5844 0, // NRDD (Read Data-Data) (0-3)
5845 5 // NRAD (Read Addr-Data) (0-31)
5846 );
5847 } else {
5848 /* do HW reset */
5849 outb( 0,info->io_base + 8 );
5850 }
5851
5852 info->mbre_bit = 0;
5853 info->loopback_bits = 0;
5854 info->usc_idle_mode = 0;
5855
5856 /*
5857 * Program the Bus Configuration Register (BCR)
5858 *
5859 * <15> 0 Don't use separate address
5860 * <14..6> 0 reserved
5861 * <5..4> 00 IAckmode = Default, don't care
5862 * <3> 1 Bus Request Totem Pole output
5863 * <2> 1 Use 16 Bit data bus
5864 * <1> 0 IRQ Totem Pole output
5865 * <0> 0 Don't Shift Right Addr
5866 *
5867 * 0000 0000 0000 1100 = 0x000c
5868 *
5869 * By writing to io_base + SDPIN the Wait/Ack pin is
5870 * programmed to work as a Wait pin.
5871 */
5872
5873 outw( 0x000c,info->io_base + SDPIN );
5874
5875
5876 outw( 0,info->io_base );
5877 outw( 0,info->io_base + CCAR );
5878
5879 /* select little endian byte ordering */
5880 usc_RTCmd( info, RTCmd_SelectLittleEndian );
5881
5882
5883 /* Port Control Register (PCR)
5884 *
5885 * <15..14> 11 Port 7 is Output (~DMAEN, Bit 14 : 0 = Enabled)
5886 * <13..12> 11 Port 6 is Output (~INTEN, Bit 12 : 0 = Enabled)
5887 * <11..10> 00 Port 5 is Input (No Connect, Don't Care)
5888 * <9..8> 00 Port 4 is Input (No Connect, Don't Care)
5889 * <7..6> 11 Port 3 is Output (~RTS, Bit 6 : 0 = Enabled )
5890 * <5..4> 11 Port 2 is Output (~DTR, Bit 4 : 0 = Enabled )
5891 * <3..2> 01 Port 1 is Input (Dedicated RxC)
5892 * <1..0> 01 Port 0 is Input (Dedicated TxC)
5893 *
5894 * 1111 0000 1111 0101 = 0xf0f5
5895 */
5896
5897 usc_OutReg( info, PCR, 0xf0f5 );
5898
5899
5900 /*
5901 * Input/Output Control Register
5902 *
5903 * <15..14> 00 CTS is active low input
5904 * <13..12> 00 DCD is active low input
5905 * <11..10> 00 TxREQ pin is input (DSR)
5906 * <9..8> 00 RxREQ pin is input (RI)
5907 * <7..6> 00 TxD is output (Transmit Data)
5908 * <5..3> 000 TxC Pin in Input (14.7456MHz Clock)
5909 * <2..0> 100 RxC is Output (drive with BRG0)
5910 *
5911 * 0000 0000 0000 0100 = 0x0004
5912 */
5913
5914 usc_OutReg( info, IOCR, 0x0004 );
5915
5916 } /* end of usc_reset() */
5917
5918 /* usc_set_async_mode()
5919 *
5920 * Program adapter for asynchronous communications.
5921 *
5922 * Arguments: info pointer to device instance data
5923 * Return Value: None
5924 */
5925 static void usc_set_async_mode( struct mgsl_struct *info )
5926 {
5927 u16 RegValue;
5928
5929 /* disable interrupts while programming USC */
5930 usc_DisableMasterIrqBit( info );
5931
5932 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5933 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5934
5935 usc_loopback_frame( info );
5936
5937 /* Channel mode Register (CMR)
5938 *
5939 * <15..14> 00 Tx Sub modes, 00 = 1 Stop Bit
5940 * <13..12> 00 00 = 16X Clock
5941 * <11..8> 0000 Transmitter mode = Asynchronous
5942 * <7..6> 00 reserved?
5943 * <5..4> 00 Rx Sub modes, 00 = 16X Clock
5944 * <3..0> 0000 Receiver mode = Asynchronous
5945 *
5946 * 0000 0000 0000 0000 = 0x0
5947 */
5948
5949 RegValue = 0;
5950 if ( info->params.stop_bits != 1 )
5951 RegValue |= BIT14;
5952 usc_OutReg( info, CMR, RegValue );
5953
5954
5955 /* Receiver mode Register (RMR)
5956 *
5957 * <15..13> 000 encoding = None
5958 * <12..08> 00000 reserved (Sync Only)
5959 * <7..6> 00 Even parity
5960 * <5> 0 parity disabled
5961 * <4..2> 000 Receive Char Length = 8 bits
5962 * <1..0> 00 Disable Receiver
5963 *
5964 * 0000 0000 0000 0000 = 0x0
5965 */
5966
5967 RegValue = 0;
5968
5969 if ( info->params.data_bits != 8 )
5970 RegValue |= BIT4+BIT3+BIT2;
5971
5972 if ( info->params.parity != ASYNC_PARITY_NONE ) {
5973 RegValue |= BIT5;
5974 if ( info->params.parity != ASYNC_PARITY_ODD )
5975 RegValue |= BIT6;
5976 }
5977
5978 usc_OutReg( info, RMR, RegValue );
5979
5980
5981 /* Set IRQ trigger level */
5982
5983 usc_RCmd( info, RCmd_SelectRicrIntLevel );
5984
5985
5986 /* Receive Interrupt Control Register (RICR)
5987 *
5988 * <15..8> ? RxFIFO IRQ Request Level
5989 *
5990 * Note: For async mode the receive FIFO level must be set
5991 * to 0 to avoid the situation where the FIFO contains fewer bytes
5992 * than the trigger level and no more data is expected.
5993 *
5994 * <7> 0 Exited Hunt IA (Interrupt Arm)
5995 * <6> 0 Idle Received IA
5996 * <5> 0 Break/Abort IA
5997 * <4> 0 Rx Bound IA
5998 * <3> 0 Queued status reflects oldest byte in FIFO
5999 * <2> 0 Abort/PE IA
6000 * <1> 0 Rx Overrun IA
6001 * <0> 0 Select TC0 value for readback
6002 *
6003 * 0000 0000 0100 0000 = 0x0000 + (FIFOLEVEL in MSB)
6004 */
6005
6006 usc_OutReg( info, RICR, 0x0000 );
6007
6008 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
6009 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
6010
6011
6012 /* Transmit mode Register (TMR)
6013 *
6014 * <15..13> 000 encoding = None
6015 * <12..08> 00000 reserved (Sync Only)
6016 * <7..6> 00 Transmit parity Even
6017 * <5> 0 Transmit parity Disabled
6018 * <4..2> 000 Tx Char Length = 8 bits
6019 * <1..0> 00 Disable Transmitter
6020 *
6021 * 0000 0000 0000 0000 = 0x0
6022 */
6023
6024 RegValue = 0;
6025
6026 if ( info->params.data_bits != 8 )
6027 RegValue |= BIT4+BIT3+BIT2;
6028
6029 if ( info->params.parity != ASYNC_PARITY_NONE ) {
6030 RegValue |= BIT5;
6031 if ( info->params.parity != ASYNC_PARITY_ODD )
6032 RegValue |= BIT6;
6033 }
6034
6035 usc_OutReg( info, TMR, RegValue );
6036
6037 usc_set_txidle( info );
6038
6039
6040 /* Set IRQ trigger level */
6041
6042 usc_TCmd( info, TCmd_SelectTicrIntLevel );
6043
6044
6045 /* Transmit Interrupt Control Register (TICR)
6046 *
6047 * <15..8> ? Transmit FIFO IRQ Level
6048 * <7> 0 Present IA (Interrupt Arm)
6049 * <6> 1 Idle Sent IA
6050 * <5> 0 Abort Sent IA
6051 * <4> 0 EOF/EOM Sent IA
6052 * <3> 0 CRC Sent IA
6053 * <2> 0 1 = Wait for SW Trigger to Start Frame
6054 * <1> 0 Tx Underrun IA
6055 * <0> 0 TC0 constant on read back
6056 *
6057 * 0000 0000 0100 0000 = 0x0040
6058 */
6059
6060 usc_OutReg( info, TICR, 0x1f40 );
6061
6062 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
6063 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
6064
6065 usc_enable_async_clock( info, info->params.data_rate );
6066
6067
6068 /* Channel Control/status Register (CCSR)
6069 *
6070 * <15> X RCC FIFO Overflow status (RO)
6071 * <14> X RCC FIFO Not Empty status (RO)
6072 * <13> 0 1 = Clear RCC FIFO (WO)
6073 * <12> X DPLL in Sync status (RO)
6074 * <11> X DPLL 2 Missed Clocks status (RO)
6075 * <10> X DPLL 1 Missed Clock status (RO)
6076 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
6077 * <7> X SDLC Loop On status (RO)
6078 * <6> X SDLC Loop Send status (RO)
6079 * <5> 1 Bypass counters for TxClk and RxClk (RW)
6080 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
6081 * <1..0> 00 reserved
6082 *
6083 * 0000 0000 0010 0000 = 0x0020
6084 */
6085
6086 usc_OutReg( info, CCSR, 0x0020 );
6087
6088 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6089 RECEIVE_DATA + RECEIVE_STATUS );
6090
6091 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6092 RECEIVE_DATA + RECEIVE_STATUS );
6093
6094 usc_EnableMasterIrqBit( info );
6095
6096 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6097 /* Enable INTEN (Port 6, Bit12) */
6098 /* This connects the IRQ request signal to the ISA bus */
6099 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6100 }
6101
6102 if (info->params.loopback) {
6103 info->loopback_bits = 0x300;
6104 outw(0x0300, info->io_base + CCAR);
6105 }
6106
6107 } /* end of usc_set_async_mode() */
6108
6109 /* usc_loopback_frame()
6110 *
6111 * Loop back a small (2 byte) dummy SDLC frame.
6112 * Interrupts and DMA are NOT used. The purpose of this is to
6113 * clear any 'stale' status info left over from running in async mode.
6114 *
6115 * The 16C32 shows the strange behaviour of marking the 1st
6116 * received SDLC frame with a CRC error even when there is no
6117 * CRC error. To get around this a small dummy from of 2 bytes
6118 * is looped back when switching from async to sync mode.
6119 *
6120 * Arguments: info pointer to device instance data
6121 * Return Value: None
6122 */
6123 static void usc_loopback_frame( struct mgsl_struct *info )
6124 {
6125 int i;
6126 unsigned long oldmode = info->params.mode;
6127
6128 info->params.mode = MGSL_MODE_HDLC;
6129
6130 usc_DisableMasterIrqBit( info );
6131
6132 usc_set_sdlc_mode( info );
6133 usc_enable_loopback( info, 1 );
6134
6135 /* Write 16-bit Time Constant for BRG0 */
6136 usc_OutReg( info, TC0R, 0 );
6137
6138 /* Channel Control Register (CCR)
6139 *
6140 * <15..14> 00 Don't use 32-bit Tx Control Blocks (TCBs)
6141 * <13> 0 Trigger Tx on SW Command Disabled
6142 * <12> 0 Flag Preamble Disabled
6143 * <11..10> 00 Preamble Length = 8-Bits
6144 * <9..8> 01 Preamble Pattern = flags
6145 * <7..6> 10 Don't use 32-bit Rx status Blocks (RSBs)
6146 * <5> 0 Trigger Rx on SW Command Disabled
6147 * <4..0> 0 reserved
6148 *
6149 * 0000 0001 0000 0000 = 0x0100
6150 */
6151
6152 usc_OutReg( info, CCR, 0x0100 );
6153
6154 /* SETUP RECEIVER */
6155 usc_RTCmd( info, RTCmd_PurgeRxFifo );
6156 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
6157
6158 /* SETUP TRANSMITTER */
6159 /* Program the Transmit Character Length Register (TCLR) */
6160 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
6161 usc_OutReg( info, TCLR, 2 );
6162 usc_RTCmd( info, RTCmd_PurgeTxFifo );
6163
6164 /* unlatch Tx status bits, and start transmit channel. */
6165 usc_UnlatchTxstatusBits(info,TXSTATUS_ALL);
6166 outw(0,info->io_base + DATAREG);
6167
6168 /* ENABLE TRANSMITTER */
6169 usc_TCmd( info, TCmd_SendFrame );
6170 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
6171
6172 /* WAIT FOR RECEIVE COMPLETE */
6173 for (i=0 ; i<1000 ; i++)
6174 if (usc_InReg( info, RCSR ) & (BIT8 + BIT4 + BIT3 + BIT1))
6175 break;
6176
6177 /* clear Internal Data loopback mode */
6178 usc_enable_loopback(info, 0);
6179
6180 usc_EnableMasterIrqBit(info);
6181
6182 info->params.mode = oldmode;
6183
6184 } /* end of usc_loopback_frame() */
6185
6186 /* usc_set_sync_mode() Programs the USC for SDLC communications.
6187 *
6188 * Arguments: info pointer to adapter info structure
6189 * Return Value: None
6190 */
6191 static void usc_set_sync_mode( struct mgsl_struct *info )
6192 {
6193 usc_loopback_frame( info );
6194 usc_set_sdlc_mode( info );
6195
6196 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6197 /* Enable INTEN (Port 6, Bit12) */
6198 /* This connects the IRQ request signal to the ISA bus */
6199 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6200 }
6201
6202 usc_enable_aux_clock(info, info->params.clock_speed);
6203
6204 if (info->params.loopback)
6205 usc_enable_loopback(info,1);
6206
6207 } /* end of mgsl_set_sync_mode() */
6208
6209 /* usc_set_txidle() Set the HDLC idle mode for the transmitter.
6210 *
6211 * Arguments: info pointer to device instance data
6212 * Return Value: None
6213 */
6214 static void usc_set_txidle( struct mgsl_struct *info )
6215 {
6216 u16 usc_idle_mode = IDLEMODE_FLAGS;
6217
6218 /* Map API idle mode to USC register bits */
6219
6220 switch( info->idle_mode ){
6221 case HDLC_TXIDLE_FLAGS: usc_idle_mode = IDLEMODE_FLAGS; break;
6222 case HDLC_TXIDLE_ALT_ZEROS_ONES: usc_idle_mode = IDLEMODE_ALT_ONE_ZERO; break;
6223 case HDLC_TXIDLE_ZEROS: usc_idle_mode = IDLEMODE_ZERO; break;
6224 case HDLC_TXIDLE_ONES: usc_idle_mode = IDLEMODE_ONE; break;
6225 case HDLC_TXIDLE_ALT_MARK_SPACE: usc_idle_mode = IDLEMODE_ALT_MARK_SPACE; break;
6226 case HDLC_TXIDLE_SPACE: usc_idle_mode = IDLEMODE_SPACE; break;
6227 case HDLC_TXIDLE_MARK: usc_idle_mode = IDLEMODE_MARK; break;
6228 }
6229
6230 info->usc_idle_mode = usc_idle_mode;
6231 //usc_OutReg(info, TCSR, usc_idle_mode);
6232 info->tcsr_value &= ~IDLEMODE_MASK; /* clear idle mode bits */
6233 info->tcsr_value += usc_idle_mode;
6234 usc_OutReg(info, TCSR, info->tcsr_value);
6235
6236 /*
6237 * if SyncLink WAN adapter is running in external sync mode, the
6238 * transmitter has been set to Monosync in order to try to mimic
6239 * a true raw outbound bit stream. Monosync still sends an open/close
6240 * sync char at the start/end of a frame. Try to match those sync
6241 * patterns to the idle mode set here
6242 */
6243 if ( info->params.mode == MGSL_MODE_RAW ) {
6244 unsigned char syncpat = 0;
6245 switch( info->idle_mode ) {
6246 case HDLC_TXIDLE_FLAGS:
6247 syncpat = 0x7e;
6248 break;
6249 case HDLC_TXIDLE_ALT_ZEROS_ONES:
6250 syncpat = 0x55;
6251 break;
6252 case HDLC_TXIDLE_ZEROS:
6253 case HDLC_TXIDLE_SPACE:
6254 syncpat = 0x00;
6255 break;
6256 case HDLC_TXIDLE_ONES:
6257 case HDLC_TXIDLE_MARK:
6258 syncpat = 0xff;
6259 break;
6260 case HDLC_TXIDLE_ALT_MARK_SPACE:
6261 syncpat = 0xaa;
6262 break;
6263 }
6264
6265 usc_SetTransmitSyncChars(info,syncpat,syncpat);
6266 }
6267
6268 } /* end of usc_set_txidle() */
6269
6270 /* usc_get_serial_signals()
6271 *
6272 * Query the adapter for the state of the V24 status (input) signals.
6273 *
6274 * Arguments: info pointer to device instance data
6275 * Return Value: None
6276 */
6277 static void usc_get_serial_signals( struct mgsl_struct *info )
6278 {
6279 u16 status;
6280
6281 /* clear all serial signals except DTR and RTS */
6282 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
6283
6284 /* Read the Misc Interrupt status Register (MISR) to get */
6285 /* the V24 status signals. */
6286
6287 status = usc_InReg( info, MISR );
6288
6289 /* set serial signal bits to reflect MISR */
6290
6291 if ( status & MISCSTATUS_CTS )
6292 info->serial_signals |= SerialSignal_CTS;
6293
6294 if ( status & MISCSTATUS_DCD )
6295 info->serial_signals |= SerialSignal_DCD;
6296
6297 if ( status & MISCSTATUS_RI )
6298 info->serial_signals |= SerialSignal_RI;
6299
6300 if ( status & MISCSTATUS_DSR )
6301 info->serial_signals |= SerialSignal_DSR;
6302
6303 } /* end of usc_get_serial_signals() */
6304
6305 /* usc_set_serial_signals()
6306 *
6307 * Set the state of DTR and RTS based on contents of
6308 * serial_signals member of device extension.
6309 *
6310 * Arguments: info pointer to device instance data
6311 * Return Value: None
6312 */
6313 static void usc_set_serial_signals( struct mgsl_struct *info )
6314 {
6315 u16 Control;
6316 unsigned char V24Out = info->serial_signals;
6317
6318 /* get the current value of the Port Control Register (PCR) */
6319
6320 Control = usc_InReg( info, PCR );
6321
6322 if ( V24Out & SerialSignal_RTS )
6323 Control &= ~(BIT6);
6324 else
6325 Control |= BIT6;
6326
6327 if ( V24Out & SerialSignal_DTR )
6328 Control &= ~(BIT4);
6329 else
6330 Control |= BIT4;
6331
6332 usc_OutReg( info, PCR, Control );
6333
6334 } /* end of usc_set_serial_signals() */
6335
6336 /* usc_enable_async_clock()
6337 *
6338 * Enable the async clock at the specified frequency.
6339 *
6340 * Arguments: info pointer to device instance data
6341 * data_rate data rate of clock in bps
6342 * 0 disables the AUX clock.
6343 * Return Value: None
6344 */
6345 static void usc_enable_async_clock( struct mgsl_struct *info, u32 data_rate )
6346 {
6347 if ( data_rate ) {
6348 /*
6349 * Clock mode Control Register (CMCR)
6350 *
6351 * <15..14> 00 counter 1 Disabled
6352 * <13..12> 00 counter 0 Disabled
6353 * <11..10> 11 BRG1 Input is TxC Pin
6354 * <9..8> 11 BRG0 Input is TxC Pin
6355 * <7..6> 01 DPLL Input is BRG1 Output
6356 * <5..3> 100 TxCLK comes from BRG0
6357 * <2..0> 100 RxCLK comes from BRG0
6358 *
6359 * 0000 1111 0110 0100 = 0x0f64
6360 */
6361
6362 usc_OutReg( info, CMCR, 0x0f64 );
6363
6364
6365 /*
6366 * Write 16-bit Time Constant for BRG0
6367 * Time Constant = (ClkSpeed / data_rate) - 1
6368 * ClkSpeed = 921600 (ISA), 691200 (PCI)
6369 */
6370
6371 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6372 usc_OutReg( info, TC0R, (u16)((691200/data_rate) - 1) );
6373 else
6374 usc_OutReg( info, TC0R, (u16)((921600/data_rate) - 1) );
6375
6376
6377 /*
6378 * Hardware Configuration Register (HCR)
6379 * Clear Bit 1, BRG0 mode = Continuous
6380 * Set Bit 0 to enable BRG0.
6381 */
6382
6383 usc_OutReg( info, HCR,
6384 (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
6385
6386
6387 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
6388
6389 usc_OutReg( info, IOCR,
6390 (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
6391 } else {
6392 /* data rate == 0 so turn off BRG0 */
6393 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
6394 }
6395
6396 } /* end of usc_enable_async_clock() */
6397
6398 /*
6399 * Buffer Structures:
6400 *
6401 * Normal memory access uses virtual addresses that can make discontiguous
6402 * physical memory pages appear to be contiguous in the virtual address
6403 * space (the processors memory mapping handles the conversions).
6404 *
6405 * DMA transfers require physically contiguous memory. This is because
6406 * the DMA system controller and DMA bus masters deal with memory using
6407 * only physical addresses.
6408 *
6409 * This causes a problem under Windows NT when large DMA buffers are
6410 * needed. Fragmentation of the nonpaged pool prevents allocations of
6411 * physically contiguous buffers larger than the PAGE_SIZE.
6412 *
6413 * However the 16C32 supports Bus Master Scatter/Gather DMA which
6414 * allows DMA transfers to physically discontiguous buffers. Information
6415 * about each data transfer buffer is contained in a memory structure
6416 * called a 'buffer entry'. A list of buffer entries is maintained
6417 * to track and control the use of the data transfer buffers.
6418 *
6419 * To support this strategy we will allocate sufficient PAGE_SIZE
6420 * contiguous memory buffers to allow for the total required buffer
6421 * space.
6422 *
6423 * The 16C32 accesses the list of buffer entries using Bus Master
6424 * DMA. Control information is read from the buffer entries by the
6425 * 16C32 to control data transfers. status information is written to
6426 * the buffer entries by the 16C32 to indicate the status of completed
6427 * transfers.
6428 *
6429 * The CPU writes control information to the buffer entries to control
6430 * the 16C32 and reads status information from the buffer entries to
6431 * determine information about received and transmitted frames.
6432 *
6433 * Because the CPU and 16C32 (adapter) both need simultaneous access
6434 * to the buffer entries, the buffer entry memory is allocated with
6435 * HalAllocateCommonBuffer(). This restricts the size of the buffer
6436 * entry list to PAGE_SIZE.
6437 *
6438 * The actual data buffers on the other hand will only be accessed
6439 * by the CPU or the adapter but not by both simultaneously. This allows
6440 * Scatter/Gather packet based DMA procedures for using physically
6441 * discontiguous pages.
6442 */
6443
6444 /*
6445 * mgsl_reset_tx_dma_buffers()
6446 *
6447 * Set the count for all transmit buffers to 0 to indicate the
6448 * buffer is available for use and set the current buffer to the
6449 * first buffer. This effectively makes all buffers free and
6450 * discards any data in buffers.
6451 *
6452 * Arguments: info pointer to device instance data
6453 * Return Value: None
6454 */
6455 static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info )
6456 {
6457 unsigned int i;
6458
6459 for ( i = 0; i < info->tx_buffer_count; i++ ) {
6460 *((unsigned long *)&(info->tx_buffer_list[i].count)) = 0;
6461 }
6462
6463 info->current_tx_buffer = 0;
6464 info->start_tx_dma_buffer = 0;
6465 info->tx_dma_buffers_used = 0;
6466
6467 info->get_tx_holding_index = 0;
6468 info->put_tx_holding_index = 0;
6469 info->tx_holding_count = 0;
6470
6471 } /* end of mgsl_reset_tx_dma_buffers() */
6472
6473 /*
6474 * num_free_tx_dma_buffers()
6475 *
6476 * returns the number of free tx dma buffers available
6477 *
6478 * Arguments: info pointer to device instance data
6479 * Return Value: number of free tx dma buffers
6480 */
6481 static int num_free_tx_dma_buffers(struct mgsl_struct *info)
6482 {
6483 return info->tx_buffer_count - info->tx_dma_buffers_used;
6484 }
6485
6486 /*
6487 * mgsl_reset_rx_dma_buffers()
6488 *
6489 * Set the count for all receive buffers to DMABUFFERSIZE
6490 * and set the current buffer to the first buffer. This effectively
6491 * makes all buffers free and discards any data in buffers.
6492 *
6493 * Arguments: info pointer to device instance data
6494 * Return Value: None
6495 */
6496 static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info )
6497 {
6498 unsigned int i;
6499
6500 for ( i = 0; i < info->rx_buffer_count; i++ ) {
6501 *((unsigned long *)&(info->rx_buffer_list[i].count)) = DMABUFFERSIZE;
6502 // info->rx_buffer_list[i].count = DMABUFFERSIZE;
6503 // info->rx_buffer_list[i].status = 0;
6504 }
6505
6506 info->current_rx_buffer = 0;
6507
6508 } /* end of mgsl_reset_rx_dma_buffers() */
6509
6510 /*
6511 * mgsl_free_rx_frame_buffers()
6512 *
6513 * Free the receive buffers used by a received SDLC
6514 * frame such that the buffers can be reused.
6515 *
6516 * Arguments:
6517 *
6518 * info pointer to device instance data
6519 * StartIndex index of 1st receive buffer of frame
6520 * EndIndex index of last receive buffer of frame
6521 *
6522 * Return Value: None
6523 */
6524 static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex )
6525 {
6526 int Done = 0;
6527 DMABUFFERENTRY *pBufEntry;
6528 unsigned int Index;
6529
6530 /* Starting with 1st buffer entry of the frame clear the status */
6531 /* field and set the count field to DMA Buffer Size. */
6532
6533 Index = StartIndex;
6534
6535 while( !Done ) {
6536 pBufEntry = &(info->rx_buffer_list[Index]);
6537
6538 if ( Index == EndIndex ) {
6539 /* This is the last buffer of the frame! */
6540 Done = 1;
6541 }
6542
6543 /* reset current buffer for reuse */
6544 // pBufEntry->status = 0;
6545 // pBufEntry->count = DMABUFFERSIZE;
6546 *((unsigned long *)&(pBufEntry->count)) = DMABUFFERSIZE;
6547
6548 /* advance to next buffer entry in linked list */
6549 Index++;
6550 if ( Index == info->rx_buffer_count )
6551 Index = 0;
6552 }
6553
6554 /* set current buffer to next buffer after last buffer of frame */
6555 info->current_rx_buffer = Index;
6556
6557 } /* end of free_rx_frame_buffers() */
6558
6559 /* mgsl_get_rx_frame()
6560 *
6561 * This function attempts to return a received SDLC frame from the
6562 * receive DMA buffers. Only frames received without errors are returned.
6563 *
6564 * Arguments: info pointer to device extension
6565 * Return Value: 1 if frame returned, otherwise 0
6566 */
6567 static int mgsl_get_rx_frame(struct mgsl_struct *info)
6568 {
6569 unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
6570 unsigned short status;
6571 DMABUFFERENTRY *pBufEntry;
6572 unsigned int framesize = 0;
6573 int ReturnCode = 0;
6574 unsigned long flags;
6575 struct tty_struct *tty = info->tty;
6576 int return_frame = 0;
6577
6578 /*
6579 * current_rx_buffer points to the 1st buffer of the next available
6580 * receive frame. To find the last buffer of the frame look for
6581 * a non-zero status field in the buffer entries. (The status
6582 * field is set by the 16C32 after completing a receive frame.
6583 */
6584
6585 StartIndex = EndIndex = info->current_rx_buffer;
6586
6587 while( !info->rx_buffer_list[EndIndex].status ) {
6588 /*
6589 * If the count field of the buffer entry is non-zero then
6590 * this buffer has not been used. (The 16C32 clears the count
6591 * field when it starts using the buffer.) If an unused buffer
6592 * is encountered then there are no frames available.
6593 */
6594
6595 if ( info->rx_buffer_list[EndIndex].count )
6596 goto Cleanup;
6597
6598 /* advance to next buffer entry in linked list */
6599 EndIndex++;
6600 if ( EndIndex == info->rx_buffer_count )
6601 EndIndex = 0;
6602
6603 /* if entire list searched then no frame available */
6604 if ( EndIndex == StartIndex ) {
6605 /* If this occurs then something bad happened,
6606 * all buffers have been 'used' but none mark
6607 * the end of a frame. Reset buffers and receiver.
6608 */
6609
6610 if ( info->rx_enabled ){
6611 spin_lock_irqsave(&info->irq_spinlock,flags);
6612 usc_start_receiver(info);
6613 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6614 }
6615 goto Cleanup;
6616 }
6617 }
6618
6619
6620 /* check status of receive frame */
6621
6622 status = info->rx_buffer_list[EndIndex].status;
6623
6624 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6625 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6626 if ( status & RXSTATUS_SHORT_FRAME )
6627 info->icount.rxshort++;
6628 else if ( status & RXSTATUS_ABORT )
6629 info->icount.rxabort++;
6630 else if ( status & RXSTATUS_OVERRUN )
6631 info->icount.rxover++;
6632 else {
6633 info->icount.rxcrc++;
6634 if ( info->params.crc_type & HDLC_CRC_RETURN_EX )
6635 return_frame = 1;
6636 }
6637 framesize = 0;
6638 #if SYNCLINK_GENERIC_HDLC
6639 {
6640 struct net_device_stats *stats = hdlc_stats(info->netdev);
6641 stats->rx_errors++;
6642 stats->rx_frame_errors++;
6643 }
6644 #endif
6645 } else
6646 return_frame = 1;
6647
6648 if ( return_frame ) {
6649 /* receive frame has no errors, get frame size.
6650 * The frame size is the starting value of the RCC (which was
6651 * set to 0xffff) minus the ending value of the RCC (decremented
6652 * once for each receive character) minus 2 for the 16-bit CRC.
6653 */
6654
6655 framesize = RCLRVALUE - info->rx_buffer_list[EndIndex].rcc;
6656
6657 /* adjust frame size for CRC if any */
6658 if ( info->params.crc_type == HDLC_CRC_16_CCITT )
6659 framesize -= 2;
6660 else if ( info->params.crc_type == HDLC_CRC_32_CCITT )
6661 framesize -= 4;
6662 }
6663
6664 if ( debug_level >= DEBUG_LEVEL_BH )
6665 printk("%s(%d):mgsl_get_rx_frame(%s) status=%04X size=%d\n",
6666 __FILE__,__LINE__,info->device_name,status,framesize);
6667
6668 if ( debug_level >= DEBUG_LEVEL_DATA )
6669 mgsl_trace_block(info,info->rx_buffer_list[StartIndex].virt_addr,
6670 min_t(int, framesize, DMABUFFERSIZE),0);
6671
6672 if (framesize) {
6673 if ( ( (info->params.crc_type & HDLC_CRC_RETURN_EX) &&
6674 ((framesize+1) > info->max_frame_size) ) ||
6675 (framesize > info->max_frame_size) )
6676 info->icount.rxlong++;
6677 else {
6678 /* copy dma buffer(s) to contiguous intermediate buffer */
6679 int copy_count = framesize;
6680 int index = StartIndex;
6681 unsigned char *ptmp = info->intermediate_rxbuffer;
6682
6683 if ( !(status & RXSTATUS_CRC_ERROR))
6684 info->icount.rxok++;
6685
6686 while(copy_count) {
6687 int partial_count;
6688 if ( copy_count > DMABUFFERSIZE )
6689 partial_count = DMABUFFERSIZE;
6690 else
6691 partial_count = copy_count;
6692
6693 pBufEntry = &(info->rx_buffer_list[index]);
6694 memcpy( ptmp, pBufEntry->virt_addr, partial_count );
6695 ptmp += partial_count;
6696 copy_count -= partial_count;
6697
6698 if ( ++index == info->rx_buffer_count )
6699 index = 0;
6700 }
6701
6702 if ( info->params.crc_type & HDLC_CRC_RETURN_EX ) {
6703 ++framesize;
6704 *ptmp = (status & RXSTATUS_CRC_ERROR ?
6705 RX_CRC_ERROR :
6706 RX_OK);
6707
6708 if ( debug_level >= DEBUG_LEVEL_DATA )
6709 printk("%s(%d):mgsl_get_rx_frame(%s) rx frame status=%d\n",
6710 __FILE__,__LINE__,info->device_name,
6711 *ptmp);
6712 }
6713
6714 #if SYNCLINK_GENERIC_HDLC
6715 if (info->netcount)
6716 hdlcdev_rx(info,info->intermediate_rxbuffer,framesize);
6717 else
6718 #endif
6719 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6720 }
6721 }
6722 /* Free the buffers used by this frame. */
6723 mgsl_free_rx_frame_buffers( info, StartIndex, EndIndex );
6724
6725 ReturnCode = 1;
6726
6727 Cleanup:
6728
6729 if ( info->rx_enabled && info->rx_overflow ) {
6730 /* The receiver needs to restarted because of
6731 * a receive overflow (buffer or FIFO). If the
6732 * receive buffers are now empty, then restart receiver.
6733 */
6734
6735 if ( !info->rx_buffer_list[EndIndex].status &&
6736 info->rx_buffer_list[EndIndex].count ) {
6737 spin_lock_irqsave(&info->irq_spinlock,flags);
6738 usc_start_receiver(info);
6739 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6740 }
6741 }
6742
6743 return ReturnCode;
6744
6745 } /* end of mgsl_get_rx_frame() */
6746
6747 /* mgsl_get_raw_rx_frame()
6748 *
6749 * This function attempts to return a received frame from the
6750 * receive DMA buffers when running in external loop mode. In this mode,
6751 * we will return at most one DMABUFFERSIZE frame to the application.
6752 * The USC receiver is triggering off of DCD going active to start a new
6753 * frame, and DCD going inactive to terminate the frame (similar to
6754 * processing a closing flag character).
6755 *
6756 * In this routine, we will return DMABUFFERSIZE "chunks" at a time.
6757 * If DCD goes inactive, the last Rx DMA Buffer will have a non-zero
6758 * status field and the RCC field will indicate the length of the
6759 * entire received frame. We take this RCC field and get the modulus
6760 * of RCC and DMABUFFERSIZE to determine if number of bytes in the
6761 * last Rx DMA buffer and return that last portion of the frame.
6762 *
6763 * Arguments: info pointer to device extension
6764 * Return Value: 1 if frame returned, otherwise 0
6765 */
6766 static int mgsl_get_raw_rx_frame(struct mgsl_struct *info)
6767 {
6768 unsigned int CurrentIndex, NextIndex;
6769 unsigned short status;
6770 DMABUFFERENTRY *pBufEntry;
6771 unsigned int framesize = 0;
6772 int ReturnCode = 0;
6773 unsigned long flags;
6774 struct tty_struct *tty = info->tty;
6775
6776 /*
6777 * current_rx_buffer points to the 1st buffer of the next available
6778 * receive frame. The status field is set by the 16C32 after
6779 * completing a receive frame. If the status field of this buffer
6780 * is zero, either the USC is still filling this buffer or this
6781 * is one of a series of buffers making up a received frame.
6782 *
6783 * If the count field of this buffer is zero, the USC is either
6784 * using this buffer or has used this buffer. Look at the count
6785 * field of the next buffer. If that next buffer's count is
6786 * non-zero, the USC is still actively using the current buffer.
6787 * Otherwise, if the next buffer's count field is zero, the
6788 * current buffer is complete and the USC is using the next
6789 * buffer.
6790 */
6791 CurrentIndex = NextIndex = info->current_rx_buffer;
6792 ++NextIndex;
6793 if ( NextIndex == info->rx_buffer_count )
6794 NextIndex = 0;
6795
6796 if ( info->rx_buffer_list[CurrentIndex].status != 0 ||
6797 (info->rx_buffer_list[CurrentIndex].count == 0 &&
6798 info->rx_buffer_list[NextIndex].count == 0)) {
6799 /*
6800 * Either the status field of this dma buffer is non-zero
6801 * (indicating the last buffer of a receive frame) or the next
6802 * buffer is marked as in use -- implying this buffer is complete
6803 * and an intermediate buffer for this received frame.
6804 */
6805
6806 status = info->rx_buffer_list[CurrentIndex].status;
6807
6808 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6809 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6810 if ( status & RXSTATUS_SHORT_FRAME )
6811 info->icount.rxshort++;
6812 else if ( status & RXSTATUS_ABORT )
6813 info->icount.rxabort++;
6814 else if ( status & RXSTATUS_OVERRUN )
6815 info->icount.rxover++;
6816 else
6817 info->icount.rxcrc++;
6818 framesize = 0;
6819 } else {
6820 /*
6821 * A receive frame is available, get frame size and status.
6822 *
6823 * The frame size is the starting value of the RCC (which was
6824 * set to 0xffff) minus the ending value of the RCC (decremented
6825 * once for each receive character) minus 2 or 4 for the 16-bit
6826 * or 32-bit CRC.
6827 *
6828 * If the status field is zero, this is an intermediate buffer.
6829 * It's size is 4K.
6830 *
6831 * If the DMA Buffer Entry's Status field is non-zero, the
6832 * receive operation completed normally (ie: DCD dropped). The
6833 * RCC field is valid and holds the received frame size.
6834 * It is possible that the RCC field will be zero on a DMA buffer
6835 * entry with a non-zero status. This can occur if the total
6836 * frame size (number of bytes between the time DCD goes active
6837 * to the time DCD goes inactive) exceeds 65535 bytes. In this
6838 * case the 16C32 has underrun on the RCC count and appears to
6839 * stop updating this counter to let us know the actual received
6840 * frame size. If this happens (non-zero status and zero RCC),
6841 * simply return the entire RxDMA Buffer
6842 */
6843 if ( status ) {
6844 /*
6845 * In the event that the final RxDMA Buffer is
6846 * terminated with a non-zero status and the RCC
6847 * field is zero, we interpret this as the RCC
6848 * having underflowed (received frame > 65535 bytes).
6849 *
6850 * Signal the event to the user by passing back
6851 * a status of RxStatus_CrcError returning the full
6852 * buffer and let the app figure out what data is
6853 * actually valid
6854 */
6855 if ( info->rx_buffer_list[CurrentIndex].rcc )
6856 framesize = RCLRVALUE - info->rx_buffer_list[CurrentIndex].rcc;
6857 else
6858 framesize = DMABUFFERSIZE;
6859 }
6860 else
6861 framesize = DMABUFFERSIZE;
6862 }
6863
6864 if ( framesize > DMABUFFERSIZE ) {
6865 /*
6866 * if running in raw sync mode, ISR handler for
6867 * End Of Buffer events terminates all buffers at 4K.
6868 * If this frame size is said to be >4K, get the
6869 * actual number of bytes of the frame in this buffer.
6870 */
6871 framesize = framesize % DMABUFFERSIZE;
6872 }
6873
6874
6875 if ( debug_level >= DEBUG_LEVEL_BH )
6876 printk("%s(%d):mgsl_get_raw_rx_frame(%s) status=%04X size=%d\n",
6877 __FILE__,__LINE__,info->device_name,status,framesize);
6878
6879 if ( debug_level >= DEBUG_LEVEL_DATA )
6880 mgsl_trace_block(info,info->rx_buffer_list[CurrentIndex].virt_addr,
6881 min_t(int, framesize, DMABUFFERSIZE),0);
6882
6883 if (framesize) {
6884 /* copy dma buffer(s) to contiguous intermediate buffer */
6885 /* NOTE: we never copy more than DMABUFFERSIZE bytes */
6886
6887 pBufEntry = &(info->rx_buffer_list[CurrentIndex]);
6888 memcpy( info->intermediate_rxbuffer, pBufEntry->virt_addr, framesize);
6889 info->icount.rxok++;
6890
6891 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6892 }
6893
6894 /* Free the buffers used by this frame. */
6895 mgsl_free_rx_frame_buffers( info, CurrentIndex, CurrentIndex );
6896
6897 ReturnCode = 1;
6898 }
6899
6900
6901 if ( info->rx_enabled && info->rx_overflow ) {
6902 /* The receiver needs to restarted because of
6903 * a receive overflow (buffer or FIFO). If the
6904 * receive buffers are now empty, then restart receiver.
6905 */
6906
6907 if ( !info->rx_buffer_list[CurrentIndex].status &&
6908 info->rx_buffer_list[CurrentIndex].count ) {
6909 spin_lock_irqsave(&info->irq_spinlock,flags);
6910 usc_start_receiver(info);
6911 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6912 }
6913 }
6914
6915 return ReturnCode;
6916
6917 } /* end of mgsl_get_raw_rx_frame() */
6918
6919 /* mgsl_load_tx_dma_buffer()
6920 *
6921 * Load the transmit DMA buffer with the specified data.
6922 *
6923 * Arguments:
6924 *
6925 * info pointer to device extension
6926 * Buffer pointer to buffer containing frame to load
6927 * BufferSize size in bytes of frame in Buffer
6928 *
6929 * Return Value: None
6930 */
6931 static void mgsl_load_tx_dma_buffer(struct mgsl_struct *info,
6932 const char *Buffer, unsigned int BufferSize)
6933 {
6934 unsigned short Copycount;
6935 unsigned int i = 0;
6936 DMABUFFERENTRY *pBufEntry;
6937
6938 if ( debug_level >= DEBUG_LEVEL_DATA )
6939 mgsl_trace_block(info,Buffer, min_t(int, BufferSize, DMABUFFERSIZE), 1);
6940
6941 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
6942 /* set CMR:13 to start transmit when
6943 * next GoAhead (abort) is received
6944 */
6945 info->cmr_value |= BIT13;
6946 }
6947
6948 /* begin loading the frame in the next available tx dma
6949 * buffer, remember it's starting location for setting
6950 * up tx dma operation
6951 */
6952 i = info->current_tx_buffer;
6953 info->start_tx_dma_buffer = i;
6954
6955 /* Setup the status and RCC (Frame Size) fields of the 1st */
6956 /* buffer entry in the transmit DMA buffer list. */
6957
6958 info->tx_buffer_list[i].status = info->cmr_value & 0xf000;
6959 info->tx_buffer_list[i].rcc = BufferSize;
6960 info->tx_buffer_list[i].count = BufferSize;
6961
6962 /* Copy frame data from 1st source buffer to the DMA buffers. */
6963 /* The frame data may span multiple DMA buffers. */
6964
6965 while( BufferSize ){
6966 /* Get a pointer to next DMA buffer entry. */
6967 pBufEntry = &info->tx_buffer_list[i++];
6968
6969 if ( i == info->tx_buffer_count )
6970 i=0;
6971
6972 /* Calculate the number of bytes that can be copied from */
6973 /* the source buffer to this DMA buffer. */
6974 if ( BufferSize > DMABUFFERSIZE )
6975 Copycount = DMABUFFERSIZE;
6976 else
6977 Copycount = BufferSize;
6978
6979 /* Actually copy data from source buffer to DMA buffer. */
6980 /* Also set the data count for this individual DMA buffer. */
6981 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6982 mgsl_load_pci_memory(pBufEntry->virt_addr, Buffer,Copycount);
6983 else
6984 memcpy(pBufEntry->virt_addr, Buffer, Copycount);
6985
6986 pBufEntry->count = Copycount;
6987
6988 /* Advance source pointer and reduce remaining data count. */
6989 Buffer += Copycount;
6990 BufferSize -= Copycount;
6991
6992 ++info->tx_dma_buffers_used;
6993 }
6994
6995 /* remember next available tx dma buffer */
6996 info->current_tx_buffer = i;
6997
6998 } /* end of mgsl_load_tx_dma_buffer() */
6999
7000 /*
7001 * mgsl_register_test()
7002 *
7003 * Performs a register test of the 16C32.
7004 *
7005 * Arguments: info pointer to device instance data
7006 * Return Value: TRUE if test passed, otherwise FALSE
7007 */
7008 static BOOLEAN mgsl_register_test( struct mgsl_struct *info )
7009 {
7010 static unsigned short BitPatterns[] =
7011 { 0x0000, 0xffff, 0xaaaa, 0x5555, 0x1234, 0x6969, 0x9696, 0x0f0f };
7012 static unsigned int Patterncount = ARRAY_SIZE(BitPatterns);
7013 unsigned int i;
7014 BOOLEAN rc = TRUE;
7015 unsigned long flags;
7016
7017 spin_lock_irqsave(&info->irq_spinlock,flags);
7018 usc_reset(info);
7019
7020 /* Verify the reset state of some registers. */
7021
7022 if ( (usc_InReg( info, SICR ) != 0) ||
7023 (usc_InReg( info, IVR ) != 0) ||
7024 (usc_InDmaReg( info, DIVR ) != 0) ){
7025 rc = FALSE;
7026 }
7027
7028 if ( rc == TRUE ){
7029 /* Write bit patterns to various registers but do it out of */
7030 /* sync, then read back and verify values. */
7031
7032 for ( i = 0 ; i < Patterncount ; i++ ) {
7033 usc_OutReg( info, TC0R, BitPatterns[i] );
7034 usc_OutReg( info, TC1R, BitPatterns[(i+1)%Patterncount] );
7035 usc_OutReg( info, TCLR, BitPatterns[(i+2)%Patterncount] );
7036 usc_OutReg( info, RCLR, BitPatterns[(i+3)%Patterncount] );
7037 usc_OutReg( info, RSR, BitPatterns[(i+4)%Patterncount] );
7038 usc_OutDmaReg( info, TBCR, BitPatterns[(i+5)%Patterncount] );
7039
7040 if ( (usc_InReg( info, TC0R ) != BitPatterns[i]) ||
7041 (usc_InReg( info, TC1R ) != BitPatterns[(i+1)%Patterncount]) ||
7042 (usc_InReg( info, TCLR ) != BitPatterns[(i+2)%Patterncount]) ||
7043 (usc_InReg( info, RCLR ) != BitPatterns[(i+3)%Patterncount]) ||
7044 (usc_InReg( info, RSR ) != BitPatterns[(i+4)%Patterncount]) ||
7045 (usc_InDmaReg( info, TBCR ) != BitPatterns[(i+5)%Patterncount]) ){
7046 rc = FALSE;
7047 break;
7048 }
7049 }
7050 }
7051
7052 usc_reset(info);
7053 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7054
7055 return rc;
7056
7057 } /* end of mgsl_register_test() */
7058
7059 /* mgsl_irq_test() Perform interrupt test of the 16C32.
7060 *
7061 * Arguments: info pointer to device instance data
7062 * Return Value: TRUE if test passed, otherwise FALSE
7063 */
7064 static BOOLEAN mgsl_irq_test( struct mgsl_struct *info )
7065 {
7066 unsigned long EndTime;
7067 unsigned long flags;
7068
7069 spin_lock_irqsave(&info->irq_spinlock,flags);
7070 usc_reset(info);
7071
7072 /*
7073 * Setup 16C32 to interrupt on TxC pin (14MHz clock) transition.
7074 * The ISR sets irq_occurred to 1.
7075 */
7076
7077 info->irq_occurred = FALSE;
7078
7079 /* Enable INTEN gate for ISA adapter (Port 6, Bit12) */
7080 /* Enable INTEN (Port 6, Bit12) */
7081 /* This connects the IRQ request signal to the ISA bus */
7082 /* on the ISA adapter. This has no effect for the PCI adapter */
7083 usc_OutReg( info, PCR, (unsigned short)((usc_InReg(info, PCR) | BIT13) & ~BIT12) );
7084
7085 usc_EnableMasterIrqBit(info);
7086 usc_EnableInterrupts(info, IO_PIN);
7087 usc_ClearIrqPendingBits(info, IO_PIN);
7088
7089 usc_UnlatchIostatusBits(info, MISCSTATUS_TXC_LATCHED);
7090 usc_EnableStatusIrqs(info, SICR_TXC_ACTIVE + SICR_TXC_INACTIVE);
7091
7092 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7093
7094 EndTime=100;
7095 while( EndTime-- && !info->irq_occurred ) {
7096 msleep_interruptible(10);
7097 }
7098
7099 spin_lock_irqsave(&info->irq_spinlock,flags);
7100 usc_reset(info);
7101 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7102
7103 if ( !info->irq_occurred )
7104 return FALSE;
7105 else
7106 return TRUE;
7107
7108 } /* end of mgsl_irq_test() */
7109
7110 /* mgsl_dma_test()
7111 *
7112 * Perform a DMA test of the 16C32. A small frame is
7113 * transmitted via DMA from a transmit buffer to a receive buffer
7114 * using single buffer DMA mode.
7115 *
7116 * Arguments: info pointer to device instance data
7117 * Return Value: TRUE if test passed, otherwise FALSE
7118 */
7119 static BOOLEAN mgsl_dma_test( struct mgsl_struct *info )
7120 {
7121 unsigned short FifoLevel;
7122 unsigned long phys_addr;
7123 unsigned int FrameSize;
7124 unsigned int i;
7125 char *TmpPtr;
7126 BOOLEAN rc = TRUE;
7127 unsigned short status=0;
7128 unsigned long EndTime;
7129 unsigned long flags;
7130 MGSL_PARAMS tmp_params;
7131
7132 /* save current port options */
7133 memcpy(&tmp_params,&info->params,sizeof(MGSL_PARAMS));
7134 /* load default port options */
7135 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
7136
7137 #define TESTFRAMESIZE 40
7138
7139 spin_lock_irqsave(&info->irq_spinlock,flags);
7140
7141 /* setup 16C32 for SDLC DMA transfer mode */
7142
7143 usc_reset(info);
7144 usc_set_sdlc_mode(info);
7145 usc_enable_loopback(info,1);
7146
7147 /* Reprogram the RDMR so that the 16C32 does NOT clear the count
7148 * field of the buffer entry after fetching buffer address. This
7149 * way we can detect a DMA failure for a DMA read (which should be
7150 * non-destructive to system memory) before we try and write to
7151 * memory (where a failure could corrupt system memory).
7152 */
7153
7154 /* Receive DMA mode Register (RDMR)
7155 *
7156 * <15..14> 11 DMA mode = Linked List Buffer mode
7157 * <13> 1 RSBinA/L = store Rx status Block in List entry
7158 * <12> 0 1 = Clear count of List Entry after fetching
7159 * <11..10> 00 Address mode = Increment
7160 * <9> 1 Terminate Buffer on RxBound
7161 * <8> 0 Bus Width = 16bits
7162 * <7..0> ? status Bits (write as 0s)
7163 *
7164 * 1110 0010 0000 0000 = 0xe200
7165 */
7166
7167 usc_OutDmaReg( info, RDMR, 0xe200 );
7168
7169 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7170
7171
7172 /* SETUP TRANSMIT AND RECEIVE DMA BUFFERS */
7173
7174 FrameSize = TESTFRAMESIZE;
7175
7176 /* setup 1st transmit buffer entry: */
7177 /* with frame size and transmit control word */
7178
7179 info->tx_buffer_list[0].count = FrameSize;
7180 info->tx_buffer_list[0].rcc = FrameSize;
7181 info->tx_buffer_list[0].status = 0x4000;
7182
7183 /* build a transmit frame in 1st transmit DMA buffer */
7184
7185 TmpPtr = info->tx_buffer_list[0].virt_addr;
7186 for (i = 0; i < FrameSize; i++ )
7187 *TmpPtr++ = i;
7188
7189 /* setup 1st receive buffer entry: */
7190 /* clear status, set max receive buffer size */
7191
7192 info->rx_buffer_list[0].status = 0;
7193 info->rx_buffer_list[0].count = FrameSize + 4;
7194
7195 /* zero out the 1st receive buffer */
7196
7197 memset( info->rx_buffer_list[0].virt_addr, 0, FrameSize + 4 );
7198
7199 /* Set count field of next buffer entries to prevent */
7200 /* 16C32 from using buffers after the 1st one. */
7201
7202 info->tx_buffer_list[1].count = 0;
7203 info->rx_buffer_list[1].count = 0;
7204
7205
7206 /***************************/
7207 /* Program 16C32 receiver. */
7208 /***************************/
7209
7210 spin_lock_irqsave(&info->irq_spinlock,flags);
7211
7212 /* setup DMA transfers */
7213 usc_RTCmd( info, RTCmd_PurgeRxFifo );
7214
7215 /* program 16C32 receiver with physical address of 1st DMA buffer entry */
7216 phys_addr = info->rx_buffer_list[0].phys_entry;
7217 usc_OutDmaReg( info, NRARL, (unsigned short)phys_addr );
7218 usc_OutDmaReg( info, NRARU, (unsigned short)(phys_addr >> 16) );
7219
7220 /* Clear the Rx DMA status bits (read RDMR) and start channel */
7221 usc_InDmaReg( info, RDMR );
7222 usc_DmaCmd( info, DmaCmd_InitRxChannel );
7223
7224 /* Enable Receiver (RMR <1..0> = 10) */
7225 usc_OutReg( info, RMR, (unsigned short)((usc_InReg(info, RMR) & 0xfffc) | 0x0002) );
7226
7227 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7228
7229
7230 /*************************************************************/
7231 /* WAIT FOR RECEIVER TO DMA ALL PARAMETERS FROM BUFFER ENTRY */
7232 /*************************************************************/
7233
7234 /* Wait 100ms for interrupt. */
7235 EndTime = jiffies + msecs_to_jiffies(100);
7236
7237 for(;;) {
7238 if (time_after(jiffies, EndTime)) {
7239 rc = FALSE;
7240 break;
7241 }
7242
7243 spin_lock_irqsave(&info->irq_spinlock,flags);
7244 status = usc_InDmaReg( info, RDMR );
7245 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7246
7247 if ( !(status & BIT4) && (status & BIT5) ) {
7248 /* INITG (BIT 4) is inactive (no entry read in progress) AND */
7249 /* BUSY (BIT 5) is active (channel still active). */
7250 /* This means the buffer entry read has completed. */
7251 break;
7252 }
7253 }
7254
7255
7256 /******************************/
7257 /* Program 16C32 transmitter. */
7258 /******************************/
7259
7260 spin_lock_irqsave(&info->irq_spinlock,flags);
7261
7262 /* Program the Transmit Character Length Register (TCLR) */
7263 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
7264
7265 usc_OutReg( info, TCLR, (unsigned short)info->tx_buffer_list[0].count );
7266 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7267
7268 /* Program the address of the 1st DMA Buffer Entry in linked list */
7269
7270 phys_addr = info->tx_buffer_list[0].phys_entry;
7271 usc_OutDmaReg( info, NTARL, (unsigned short)phys_addr );
7272 usc_OutDmaReg( info, NTARU, (unsigned short)(phys_addr >> 16) );
7273
7274 /* unlatch Tx status bits, and start transmit channel. */
7275
7276 usc_OutReg( info, TCSR, (unsigned short)(( usc_InReg(info, TCSR) & 0x0f00) | 0xfa) );
7277 usc_DmaCmd( info, DmaCmd_InitTxChannel );
7278
7279 /* wait for DMA controller to fill transmit FIFO */
7280
7281 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
7282
7283 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7284
7285
7286 /**********************************/
7287 /* WAIT FOR TRANSMIT FIFO TO FILL */
7288 /**********************************/
7289
7290 /* Wait 100ms */
7291 EndTime = jiffies + msecs_to_jiffies(100);
7292
7293 for(;;) {
7294 if (time_after(jiffies, EndTime)) {
7295 rc = FALSE;
7296 break;
7297 }
7298
7299 spin_lock_irqsave(&info->irq_spinlock,flags);
7300 FifoLevel = usc_InReg(info, TICR) >> 8;
7301 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7302
7303 if ( FifoLevel < 16 )
7304 break;
7305 else
7306 if ( FrameSize < 32 ) {
7307 /* This frame is smaller than the entire transmit FIFO */
7308 /* so wait for the entire frame to be loaded. */
7309 if ( FifoLevel <= (32 - FrameSize) )
7310 break;
7311 }
7312 }
7313
7314
7315 if ( rc == TRUE )
7316 {
7317 /* Enable 16C32 transmitter. */
7318
7319 spin_lock_irqsave(&info->irq_spinlock,flags);
7320
7321 /* Transmit mode Register (TMR), <1..0> = 10, Enable Transmitter */
7322 usc_TCmd( info, TCmd_SendFrame );
7323 usc_OutReg( info, TMR, (unsigned short)((usc_InReg(info, TMR) & 0xfffc) | 0x0002) );
7324
7325 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7326
7327
7328 /******************************/
7329 /* WAIT FOR TRANSMIT COMPLETE */
7330 /******************************/
7331
7332 /* Wait 100ms */
7333 EndTime = jiffies + msecs_to_jiffies(100);
7334
7335 /* While timer not expired wait for transmit complete */
7336
7337 spin_lock_irqsave(&info->irq_spinlock,flags);
7338 status = usc_InReg( info, TCSR );
7339 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7340
7341 while ( !(status & (BIT6+BIT5+BIT4+BIT2+BIT1)) ) {
7342 if (time_after(jiffies, EndTime)) {
7343 rc = FALSE;
7344 break;
7345 }
7346
7347 spin_lock_irqsave(&info->irq_spinlock,flags);
7348 status = usc_InReg( info, TCSR );
7349 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7350 }
7351 }
7352
7353
7354 if ( rc == TRUE ){
7355 /* CHECK FOR TRANSMIT ERRORS */
7356 if ( status & (BIT5 + BIT1) )
7357 rc = FALSE;
7358 }
7359
7360 if ( rc == TRUE ) {
7361 /* WAIT FOR RECEIVE COMPLETE */
7362
7363 /* Wait 100ms */
7364 EndTime = jiffies + msecs_to_jiffies(100);
7365
7366 /* Wait for 16C32 to write receive status to buffer entry. */
7367 status=info->rx_buffer_list[0].status;
7368 while ( status == 0 ) {
7369 if (time_after(jiffies, EndTime)) {
7370 rc = FALSE;
7371 break;
7372 }
7373 status=info->rx_buffer_list[0].status;
7374 }
7375 }
7376
7377
7378 if ( rc == TRUE ) {
7379 /* CHECK FOR RECEIVE ERRORS */
7380 status = info->rx_buffer_list[0].status;
7381
7382 if ( status & (BIT8 + BIT3 + BIT1) ) {
7383 /* receive error has occurred */
7384 rc = FALSE;
7385 } else {
7386 if ( memcmp( info->tx_buffer_list[0].virt_addr ,
7387 info->rx_buffer_list[0].virt_addr, FrameSize ) ){
7388 rc = FALSE;
7389 }
7390 }
7391 }
7392
7393 spin_lock_irqsave(&info->irq_spinlock,flags);
7394 usc_reset( info );
7395 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7396
7397 /* restore current port options */
7398 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
7399
7400 return rc;
7401
7402 } /* end of mgsl_dma_test() */
7403
7404 /* mgsl_adapter_test()
7405 *
7406 * Perform the register, IRQ, and DMA tests for the 16C32.
7407 *
7408 * Arguments: info pointer to device instance data
7409 * Return Value: 0 if success, otherwise -ENODEV
7410 */
7411 static int mgsl_adapter_test( struct mgsl_struct *info )
7412 {
7413 if ( debug_level >= DEBUG_LEVEL_INFO )
7414 printk( "%s(%d):Testing device %s\n",
7415 __FILE__,__LINE__,info->device_name );
7416
7417 if ( !mgsl_register_test( info ) ) {
7418 info->init_error = DiagStatus_AddressFailure;
7419 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
7420 __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
7421 return -ENODEV;
7422 }
7423
7424 if ( !mgsl_irq_test( info ) ) {
7425 info->init_error = DiagStatus_IrqFailure;
7426 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
7427 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
7428 return -ENODEV;
7429 }
7430
7431 if ( !mgsl_dma_test( info ) ) {
7432 info->init_error = DiagStatus_DmaFailure;
7433 printk( "%s(%d):DMA test failure for device %s DMA=%d\n",
7434 __FILE__,__LINE__,info->device_name, (unsigned short)(info->dma_level) );
7435 return -ENODEV;
7436 }
7437
7438 if ( debug_level >= DEBUG_LEVEL_INFO )
7439 printk( "%s(%d):device %s passed diagnostics\n",
7440 __FILE__,__LINE__,info->device_name );
7441
7442 return 0;
7443
7444 } /* end of mgsl_adapter_test() */
7445
7446 /* mgsl_memory_test()
7447 *
7448 * Test the shared memory on a PCI adapter.
7449 *
7450 * Arguments: info pointer to device instance data
7451 * Return Value: TRUE if test passed, otherwise FALSE
7452 */
7453 static BOOLEAN mgsl_memory_test( struct mgsl_struct *info )
7454 {
7455 static unsigned long BitPatterns[] =
7456 { 0x0, 0x55555555, 0xaaaaaaaa, 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
7457 unsigned long Patterncount = ARRAY_SIZE(BitPatterns);
7458 unsigned long i;
7459 unsigned long TestLimit = SHARED_MEM_ADDRESS_SIZE/sizeof(unsigned long);
7460 unsigned long * TestAddr;
7461
7462 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
7463 return TRUE;
7464
7465 TestAddr = (unsigned long *)info->memory_base;
7466
7467 /* Test data lines with test pattern at one location. */
7468
7469 for ( i = 0 ; i < Patterncount ; i++ ) {
7470 *TestAddr = BitPatterns[i];
7471 if ( *TestAddr != BitPatterns[i] )
7472 return FALSE;
7473 }
7474
7475 /* Test address lines with incrementing pattern over */
7476 /* entire address range. */
7477
7478 for ( i = 0 ; i < TestLimit ; i++ ) {
7479 *TestAddr = i * 4;
7480 TestAddr++;
7481 }
7482
7483 TestAddr = (unsigned long *)info->memory_base;
7484
7485 for ( i = 0 ; i < TestLimit ; i++ ) {
7486 if ( *TestAddr != i * 4 )
7487 return FALSE;
7488 TestAddr++;
7489 }
7490
7491 memset( info->memory_base, 0, SHARED_MEM_ADDRESS_SIZE );
7492
7493 return TRUE;
7494
7495 } /* End Of mgsl_memory_test() */
7496
7497
7498 /* mgsl_load_pci_memory()
7499 *
7500 * Load a large block of data into the PCI shared memory.
7501 * Use this instead of memcpy() or memmove() to move data
7502 * into the PCI shared memory.
7503 *
7504 * Notes:
7505 *
7506 * This function prevents the PCI9050 interface chip from hogging
7507 * the adapter local bus, which can starve the 16C32 by preventing
7508 * 16C32 bus master cycles.
7509 *
7510 * The PCI9050 documentation says that the 9050 will always release
7511 * control of the local bus after completing the current read
7512 * or write operation.
7513 *
7514 * It appears that as long as the PCI9050 write FIFO is full, the
7515 * PCI9050 treats all of the writes as a single burst transaction
7516 * and will not release the bus. This causes DMA latency problems
7517 * at high speeds when copying large data blocks to the shared
7518 * memory.
7519 *
7520 * This function in effect, breaks the a large shared memory write
7521 * into multiple transations by interleaving a shared memory read
7522 * which will flush the write FIFO and 'complete' the write
7523 * transation. This allows any pending DMA request to gain control
7524 * of the local bus in a timely fasion.
7525 *
7526 * Arguments:
7527 *
7528 * TargetPtr pointer to target address in PCI shared memory
7529 * SourcePtr pointer to source buffer for data
7530 * count count in bytes of data to copy
7531 *
7532 * Return Value: None
7533 */
7534 static void mgsl_load_pci_memory( char* TargetPtr, const char* SourcePtr,
7535 unsigned short count )
7536 {
7537 /* 16 32-bit writes @ 60ns each = 960ns max latency on local bus */
7538 #define PCI_LOAD_INTERVAL 64
7539
7540 unsigned short Intervalcount = count / PCI_LOAD_INTERVAL;
7541 unsigned short Index;
7542 unsigned long Dummy;
7543
7544 for ( Index = 0 ; Index < Intervalcount ; Index++ )
7545 {
7546 memcpy(TargetPtr, SourcePtr, PCI_LOAD_INTERVAL);
7547 Dummy = *((volatile unsigned long *)TargetPtr);
7548 TargetPtr += PCI_LOAD_INTERVAL;
7549 SourcePtr += PCI_LOAD_INTERVAL;
7550 }
7551
7552 memcpy( TargetPtr, SourcePtr, count % PCI_LOAD_INTERVAL );
7553
7554 } /* End Of mgsl_load_pci_memory() */
7555
7556 static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit)
7557 {
7558 int i;
7559 int linecount;
7560 if (xmit)
7561 printk("%s tx data:\n",info->device_name);
7562 else
7563 printk("%s rx data:\n",info->device_name);
7564
7565 while(count) {
7566 if (count > 16)
7567 linecount = 16;
7568 else
7569 linecount = count;
7570
7571 for(i=0;i<linecount;i++)
7572 printk("%02X ",(unsigned char)data[i]);
7573 for(;i<17;i++)
7574 printk(" ");
7575 for(i=0;i<linecount;i++) {
7576 if (data[i]>=040 && data[i]<=0176)
7577 printk("%c",data[i]);
7578 else
7579 printk(".");
7580 }
7581 printk("\n");
7582
7583 data += linecount;
7584 count -= linecount;
7585 }
7586 } /* end of mgsl_trace_block() */
7587
7588 /* mgsl_tx_timeout()
7589 *
7590 * called when HDLC frame times out
7591 * update stats and do tx completion processing
7592 *
7593 * Arguments: context pointer to device instance data
7594 * Return Value: None
7595 */
7596 static void mgsl_tx_timeout(unsigned long context)
7597 {
7598 struct mgsl_struct *info = (struct mgsl_struct*)context;
7599 unsigned long flags;
7600
7601 if ( debug_level >= DEBUG_LEVEL_INFO )
7602 printk( "%s(%d):mgsl_tx_timeout(%s)\n",
7603 __FILE__,__LINE__,info->device_name);
7604 if(info->tx_active &&
7605 (info->params.mode == MGSL_MODE_HDLC ||
7606 info->params.mode == MGSL_MODE_RAW) ) {
7607 info->icount.txtimeout++;
7608 }
7609 spin_lock_irqsave(&info->irq_spinlock,flags);
7610 info->tx_active = 0;
7611 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
7612
7613 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
7614 usc_loopmode_cancel_transmit( info );
7615
7616 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7617
7618 #if SYNCLINK_GENERIC_HDLC
7619 if (info->netcount)
7620 hdlcdev_tx_done(info);
7621 else
7622 #endif
7623 mgsl_bh_transmit(info);
7624
7625 } /* end of mgsl_tx_timeout() */
7626
7627 /* signal that there are no more frames to send, so that
7628 * line is 'released' by echoing RxD to TxD when current
7629 * transmission is complete (or immediately if no tx in progress).
7630 */
7631 static int mgsl_loopmode_send_done( struct mgsl_struct * info )
7632 {
7633 unsigned long flags;
7634
7635 spin_lock_irqsave(&info->irq_spinlock,flags);
7636 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
7637 if (info->tx_active)
7638 info->loopmode_send_done_requested = TRUE;
7639 else
7640 usc_loopmode_send_done(info);
7641 }
7642 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7643
7644 return 0;
7645 }
7646
7647 /* release the line by echoing RxD to TxD
7648 * upon completion of a transmit frame
7649 */
7650 static void usc_loopmode_send_done( struct mgsl_struct * info )
7651 {
7652 info->loopmode_send_done_requested = FALSE;
7653 /* clear CMR:13 to 0 to start echoing RxData to TxData */
7654 info->cmr_value &= ~BIT13;
7655 usc_OutReg(info, CMR, info->cmr_value);
7656 }
7657
7658 /* abort a transmit in progress while in HDLC LoopMode
7659 */
7660 static void usc_loopmode_cancel_transmit( struct mgsl_struct * info )
7661 {
7662 /* reset tx dma channel and purge TxFifo */
7663 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7664 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
7665 usc_loopmode_send_done( info );
7666 }
7667
7668 /* for HDLC/SDLC LoopMode, setting CMR:13 after the transmitter is enabled
7669 * is an Insert Into Loop action. Upon receipt of a GoAhead sequence (RxAbort)
7670 * we must clear CMR:13 to begin repeating TxData to RxData
7671 */
7672 static void usc_loopmode_insert_request( struct mgsl_struct * info )
7673 {
7674 info->loopmode_insert_requested = TRUE;
7675
7676 /* enable RxAbort irq. On next RxAbort, clear CMR:13 to
7677 * begin repeating TxData on RxData (complete insertion)
7678 */
7679 usc_OutReg( info, RICR,
7680 (usc_InReg( info, RICR ) | RXSTATUS_ABORT_RECEIVED ) );
7681
7682 /* set CMR:13 to insert into loop on next GoAhead (RxAbort) */
7683 info->cmr_value |= BIT13;
7684 usc_OutReg(info, CMR, info->cmr_value);
7685 }
7686
7687 /* return 1 if station is inserted into the loop, otherwise 0
7688 */
7689 static int usc_loopmode_active( struct mgsl_struct * info)
7690 {
7691 return usc_InReg( info, CCSR ) & BIT7 ? 1 : 0 ;
7692 }
7693
7694 #if SYNCLINK_GENERIC_HDLC
7695
7696 /**
7697 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
7698 * set encoding and frame check sequence (FCS) options
7699 *
7700 * dev pointer to network device structure
7701 * encoding serial encoding setting
7702 * parity FCS setting
7703 *
7704 * returns 0 if success, otherwise error code
7705 */
7706 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
7707 unsigned short parity)
7708 {
7709 struct mgsl_struct *info = dev_to_port(dev);
7710 unsigned char new_encoding;
7711 unsigned short new_crctype;
7712
7713 /* return error if TTY interface open */
7714 if (info->count)
7715 return -EBUSY;
7716
7717 switch (encoding)
7718 {
7719 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
7720 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
7721 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
7722 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
7723 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
7724 default: return -EINVAL;
7725 }
7726
7727 switch (parity)
7728 {
7729 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
7730 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
7731 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
7732 default: return -EINVAL;
7733 }
7734
7735 info->params.encoding = new_encoding;
7736 info->params.crc_type = new_crctype;
7737
7738 /* if network interface up, reprogram hardware */
7739 if (info->netcount)
7740 mgsl_program_hw(info);
7741
7742 return 0;
7743 }
7744
7745 /**
7746 * called by generic HDLC layer to send frame
7747 *
7748 * skb socket buffer containing HDLC frame
7749 * dev pointer to network device structure
7750 *
7751 * returns 0 if success, otherwise error code
7752 */
7753 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
7754 {
7755 struct mgsl_struct *info = dev_to_port(dev);
7756 struct net_device_stats *stats = hdlc_stats(dev);
7757 unsigned long flags;
7758
7759 if (debug_level >= DEBUG_LEVEL_INFO)
7760 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
7761
7762 /* stop sending until this frame completes */
7763 netif_stop_queue(dev);
7764
7765 /* copy data to device buffers */
7766 info->xmit_cnt = skb->len;
7767 mgsl_load_tx_dma_buffer(info, skb->data, skb->len);
7768
7769 /* update network statistics */
7770 stats->tx_packets++;
7771 stats->tx_bytes += skb->len;
7772
7773 /* done with socket buffer, so free it */
7774 dev_kfree_skb(skb);
7775
7776 /* save start time for transmit timeout detection */
7777 dev->trans_start = jiffies;
7778
7779 /* start hardware transmitter if necessary */
7780 spin_lock_irqsave(&info->irq_spinlock,flags);
7781 if (!info->tx_active)
7782 usc_start_transmitter(info);
7783 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7784
7785 return 0;
7786 }
7787
7788 /**
7789 * called by network layer when interface enabled
7790 * claim resources and initialize hardware
7791 *
7792 * dev pointer to network device structure
7793 *
7794 * returns 0 if success, otherwise error code
7795 */
7796 static int hdlcdev_open(struct net_device *dev)
7797 {
7798 struct mgsl_struct *info = dev_to_port(dev);
7799 int rc;
7800 unsigned long flags;
7801
7802 if (debug_level >= DEBUG_LEVEL_INFO)
7803 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
7804
7805 /* generic HDLC layer open processing */
7806 if ((rc = hdlc_open(dev)))
7807 return rc;
7808
7809 /* arbitrate between network and tty opens */
7810 spin_lock_irqsave(&info->netlock, flags);
7811 if (info->count != 0 || info->netcount != 0) {
7812 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
7813 spin_unlock_irqrestore(&info->netlock, flags);
7814 return -EBUSY;
7815 }
7816 info->netcount=1;
7817 spin_unlock_irqrestore(&info->netlock, flags);
7818
7819 /* claim resources and init adapter */
7820 if ((rc = startup(info)) != 0) {
7821 spin_lock_irqsave(&info->netlock, flags);
7822 info->netcount=0;
7823 spin_unlock_irqrestore(&info->netlock, flags);
7824 return rc;
7825 }
7826
7827 /* assert DTR and RTS, apply hardware settings */
7828 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
7829 mgsl_program_hw(info);
7830
7831 /* enable network layer transmit */
7832 dev->trans_start = jiffies;
7833 netif_start_queue(dev);
7834
7835 /* inform generic HDLC layer of current DCD status */
7836 spin_lock_irqsave(&info->irq_spinlock, flags);
7837 usc_get_serial_signals(info);
7838 spin_unlock_irqrestore(&info->irq_spinlock, flags);
7839 if (info->serial_signals & SerialSignal_DCD)
7840 netif_carrier_on(dev);
7841 else
7842 netif_carrier_off(dev);
7843 return 0;
7844 }
7845
7846 /**
7847 * called by network layer when interface is disabled
7848 * shutdown hardware and release resources
7849 *
7850 * dev pointer to network device structure
7851 *
7852 * returns 0 if success, otherwise error code
7853 */
7854 static int hdlcdev_close(struct net_device *dev)
7855 {
7856 struct mgsl_struct *info = dev_to_port(dev);
7857 unsigned long flags;
7858
7859 if (debug_level >= DEBUG_LEVEL_INFO)
7860 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
7861
7862 netif_stop_queue(dev);
7863
7864 /* shutdown adapter and release resources */
7865 shutdown(info);
7866
7867 hdlc_close(dev);
7868
7869 spin_lock_irqsave(&info->netlock, flags);
7870 info->netcount=0;
7871 spin_unlock_irqrestore(&info->netlock, flags);
7872
7873 return 0;
7874 }
7875
7876 /**
7877 * called by network layer to process IOCTL call to network device
7878 *
7879 * dev pointer to network device structure
7880 * ifr pointer to network interface request structure
7881 * cmd IOCTL command code
7882 *
7883 * returns 0 if success, otherwise error code
7884 */
7885 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
7886 {
7887 const size_t size = sizeof(sync_serial_settings);
7888 sync_serial_settings new_line;
7889 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
7890 struct mgsl_struct *info = dev_to_port(dev);
7891 unsigned int flags;
7892
7893 if (debug_level >= DEBUG_LEVEL_INFO)
7894 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
7895
7896 /* return error if TTY interface open */
7897 if (info->count)
7898 return -EBUSY;
7899
7900 if (cmd != SIOCWANDEV)
7901 return hdlc_ioctl(dev, ifr, cmd);
7902
7903 switch(ifr->ifr_settings.type) {
7904 case IF_GET_IFACE: /* return current sync_serial_settings */
7905
7906 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
7907 if (ifr->ifr_settings.size < size) {
7908 ifr->ifr_settings.size = size; /* data size wanted */
7909 return -ENOBUFS;
7910 }
7911
7912 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7913 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7914 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7915 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7916
7917 switch (flags){
7918 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
7919 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
7920 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
7921 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
7922 default: new_line.clock_type = CLOCK_DEFAULT;
7923 }
7924
7925 new_line.clock_rate = info->params.clock_speed;
7926 new_line.loopback = info->params.loopback ? 1:0;
7927
7928 if (copy_to_user(line, &new_line, size))
7929 return -EFAULT;
7930 return 0;
7931
7932 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
7933
7934 if(!capable(CAP_NET_ADMIN))
7935 return -EPERM;
7936 if (copy_from_user(&new_line, line, size))
7937 return -EFAULT;
7938
7939 switch (new_line.clock_type)
7940 {
7941 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
7942 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
7943 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
7944 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
7945 case CLOCK_DEFAULT: flags = info->params.flags &
7946 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7947 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7948 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7949 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
7950 default: return -EINVAL;
7951 }
7952
7953 if (new_line.loopback != 0 && new_line.loopback != 1)
7954 return -EINVAL;
7955
7956 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7957 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7958 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7959 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7960 info->params.flags |= flags;
7961
7962 info->params.loopback = new_line.loopback;
7963
7964 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
7965 info->params.clock_speed = new_line.clock_rate;
7966 else
7967 info->params.clock_speed = 0;
7968
7969 /* if network interface up, reprogram hardware */
7970 if (info->netcount)
7971 mgsl_program_hw(info);
7972 return 0;
7973
7974 default:
7975 return hdlc_ioctl(dev, ifr, cmd);
7976 }
7977 }
7978
7979 /**
7980 * called by network layer when transmit timeout is detected
7981 *
7982 * dev pointer to network device structure
7983 */
7984 static void hdlcdev_tx_timeout(struct net_device *dev)
7985 {
7986 struct mgsl_struct *info = dev_to_port(dev);
7987 struct net_device_stats *stats = hdlc_stats(dev);
7988 unsigned long flags;
7989
7990 if (debug_level >= DEBUG_LEVEL_INFO)
7991 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
7992
7993 stats->tx_errors++;
7994 stats->tx_aborted_errors++;
7995
7996 spin_lock_irqsave(&info->irq_spinlock,flags);
7997 usc_stop_transmitter(info);
7998 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7999
8000 netif_wake_queue(dev);
8001 }
8002
8003 /**
8004 * called by device driver when transmit completes
8005 * reenable network layer transmit if stopped
8006 *
8007 * info pointer to device instance information
8008 */
8009 static void hdlcdev_tx_done(struct mgsl_struct *info)
8010 {
8011 if (netif_queue_stopped(info->netdev))
8012 netif_wake_queue(info->netdev);
8013 }
8014
8015 /**
8016 * called by device driver when frame received
8017 * pass frame to network layer
8018 *
8019 * info pointer to device instance information
8020 * buf pointer to buffer contianing frame data
8021 * size count of data bytes in buf
8022 */
8023 static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size)
8024 {
8025 struct sk_buff *skb = dev_alloc_skb(size);
8026 struct net_device *dev = info->netdev;
8027 struct net_device_stats *stats = hdlc_stats(dev);
8028
8029 if (debug_level >= DEBUG_LEVEL_INFO)
8030 printk("hdlcdev_rx(%s)\n",dev->name);
8031
8032 if (skb == NULL) {
8033 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
8034 stats->rx_dropped++;
8035 return;
8036 }
8037
8038 memcpy(skb_put(skb, size),buf,size);
8039
8040 skb->protocol = hdlc_type_trans(skb, info->netdev);
8041
8042 stats->rx_packets++;
8043 stats->rx_bytes += size;
8044
8045 netif_rx(skb);
8046
8047 info->netdev->last_rx = jiffies;
8048 }
8049
8050 /**
8051 * called by device driver when adding device instance
8052 * do generic HDLC initialization
8053 *
8054 * info pointer to device instance information
8055 *
8056 * returns 0 if success, otherwise error code
8057 */
8058 static int hdlcdev_init(struct mgsl_struct *info)
8059 {
8060 int rc;
8061 struct net_device *dev;
8062 hdlc_device *hdlc;
8063
8064 /* allocate and initialize network and HDLC layer objects */
8065
8066 if (!(dev = alloc_hdlcdev(info))) {
8067 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
8068 return -ENOMEM;
8069 }
8070
8071 /* for network layer reporting purposes only */
8072 dev->base_addr = info->io_base;
8073 dev->irq = info->irq_level;
8074 dev->dma = info->dma_level;
8075
8076 /* network layer callbacks and settings */
8077 dev->do_ioctl = hdlcdev_ioctl;
8078 dev->open = hdlcdev_open;
8079 dev->stop = hdlcdev_close;
8080 dev->tx_timeout = hdlcdev_tx_timeout;
8081 dev->watchdog_timeo = 10*HZ;
8082 dev->tx_queue_len = 50;
8083
8084 /* generic HDLC layer callbacks and settings */
8085 hdlc = dev_to_hdlc(dev);
8086 hdlc->attach = hdlcdev_attach;
8087 hdlc->xmit = hdlcdev_xmit;
8088
8089 /* register objects with HDLC layer */
8090 if ((rc = register_hdlc_device(dev))) {
8091 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
8092 free_netdev(dev);
8093 return rc;
8094 }
8095
8096 info->netdev = dev;
8097 return 0;
8098 }
8099
8100 /**
8101 * called by device driver when removing device instance
8102 * do generic HDLC cleanup
8103 *
8104 * info pointer to device instance information
8105 */
8106 static void hdlcdev_exit(struct mgsl_struct *info)
8107 {
8108 unregister_hdlc_device(info->netdev);
8109 free_netdev(info->netdev);
8110 info->netdev = NULL;
8111 }
8112
8113 #endif /* CONFIG_HDLC */
8114
8115
8116 static int __devinit synclink_init_one (struct pci_dev *dev,
8117 const struct pci_device_id *ent)
8118 {
8119 struct mgsl_struct *info;
8120
8121 if (pci_enable_device(dev)) {
8122 printk("error enabling pci device %p\n", dev);
8123 return -EIO;
8124 }
8125
8126 if (!(info = mgsl_allocate_device())) {
8127 printk("can't allocate device instance data.\n");
8128 return -EIO;
8129 }
8130
8131 /* Copy user configuration info to device instance data */
8132
8133 info->io_base = pci_resource_start(dev, 2);
8134 info->irq_level = dev->irq;
8135 info->phys_memory_base = pci_resource_start(dev, 3);
8136
8137 /* Because veremap only works on page boundaries we must map
8138 * a larger area than is actually implemented for the LCR
8139 * memory range. We map a full page starting at the page boundary.
8140 */
8141 info->phys_lcr_base = pci_resource_start(dev, 0);
8142 info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
8143 info->phys_lcr_base &= ~(PAGE_SIZE-1);
8144
8145 info->bus_type = MGSL_BUS_TYPE_PCI;
8146 info->io_addr_size = 8;
8147 info->irq_flags = IRQF_SHARED;
8148
8149 if (dev->device == 0x0210) {
8150 /* Version 1 PCI9030 based universal PCI adapter */
8151 info->misc_ctrl_value = 0x007c4080;
8152 info->hw_version = 1;
8153 } else {
8154 /* Version 0 PCI9050 based 5V PCI adapter
8155 * A PCI9050 bug prevents reading LCR registers if
8156 * LCR base address bit 7 is set. Maintain shadow
8157 * value so we can write to LCR misc control reg.
8158 */
8159 info->misc_ctrl_value = 0x087e4546;
8160 info->hw_version = 0;
8161 }
8162
8163 mgsl_add_device(info);
8164
8165 return 0;
8166 }
8167
8168 static void __devexit synclink_remove_one (struct pci_dev *dev)
8169 {
8170 }
8171
Stable & featurefull patchset based on Linus's git branch