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mtd: tests: fix read buffer overflows
[linux-2.6/mini2440.git] / drivers / char / synclinkmp.c
blob8d4a2a8a0a7001ad314fa282c589229ea53d8804
1 /*
2 * $Id: synclinkmp.c,v 4.38 2005/07/15 13:29:44 paulkf Exp $
3 *
4 * Device driver for Microgate SyncLink Multiport
5 * high speed multiprotocol serial adapter.
6 *
7 * written by Paul Fulghum for Microgate Corporation
8 * paulkf@microgate.com
9 *
10 * Microgate and SyncLink are trademarks of Microgate Corporation
11 *
12 * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
13 * This code is released under the GNU General Public License (GPL)
14 *
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
16 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
23 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
25 * OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
29 #if defined(__i386__)
30 # define BREAKPOINT() asm(" int $3");
31 #else
32 # define BREAKPOINT() { }
33 #endif
34
35 #define MAX_DEVICES 12
36
37 #include <linux/module.h>
38 #include <linux/errno.h>
39 #include <linux/signal.h>
40 #include <linux/sched.h>
41 #include <linux/timer.h>
42 #include <linux/interrupt.h>
43 #include <linux/pci.h>
44 #include <linux/tty.h>
45 #include <linux/tty_flip.h>
46 #include <linux/serial.h>
47 #include <linux/major.h>
48 #include <linux/string.h>
49 #include <linux/fcntl.h>
50 #include <linux/ptrace.h>
51 #include <linux/ioport.h>
52 #include <linux/mm.h>
53 #include <linux/seq_file.h>
54 #include <linux/slab.h>
55 #include <linux/smp_lock.h>
56 #include <linux/netdevice.h>
57 #include <linux/vmalloc.h>
58 #include <linux/init.h>
59 #include <linux/delay.h>
60 #include <linux/ioctl.h>
61
62 #include <asm/system.h>
63 #include <asm/io.h>
64 #include <asm/irq.h>
65 #include <asm/dma.h>
66 #include <linux/bitops.h>
67 #include <asm/types.h>
68 #include <linux/termios.h>
69 #include <linux/workqueue.h>
70 #include <linux/hdlc.h>
71 #include <linux/synclink.h>
72
73 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINKMP_MODULE))
74 #define SYNCLINK_GENERIC_HDLC 1
75 #else
76 #define SYNCLINK_GENERIC_HDLC 0
77 #endif
78
79 #define GET_USER(error,value,addr) error = get_user(value,addr)
80 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
81 #define PUT_USER(error,value,addr) error = put_user(value,addr)
82 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
83
84 #include <asm/uaccess.h>
85
86 static MGSL_PARAMS default_params = {
87 MGSL_MODE_HDLC, /* unsigned long mode */
88 0, /* unsigned char loopback; */
89 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
90 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
91 0, /* unsigned long clock_speed; */
92 0xff, /* unsigned char addr_filter; */
93 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
94 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
95 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
96 9600, /* unsigned long data_rate; */
97 8, /* unsigned char data_bits; */
98 1, /* unsigned char stop_bits; */
99 ASYNC_PARITY_NONE /* unsigned char parity; */
100 };
101
102 /* size in bytes of DMA data buffers */
103 #define SCABUFSIZE 1024
104 #define SCA_MEM_SIZE 0x40000
105 #define SCA_BASE_SIZE 512
106 #define SCA_REG_SIZE 16
107 #define SCA_MAX_PORTS 4
108 #define SCAMAXDESC 128
109
110 #define BUFFERLISTSIZE 4096
111
112 /* SCA-I style DMA buffer descriptor */
113 typedef struct _SCADESC
114 {
115 u16 next; /* lower l6 bits of next descriptor addr */
116 u16 buf_ptr; /* lower 16 bits of buffer addr */
117 u8 buf_base; /* upper 8 bits of buffer addr */
118 u8 pad1;
119 u16 length; /* length of buffer */
120 u8 status; /* status of buffer */
121 u8 pad2;
122 } SCADESC, *PSCADESC;
123
124 typedef struct _SCADESC_EX
125 {
126 /* device driver bookkeeping section */
127 char *virt_addr; /* virtual address of data buffer */
128 u16 phys_entry; /* lower 16-bits of physical address of this descriptor */
129 } SCADESC_EX, *PSCADESC_EX;
130
131 /* The queue of BH actions to be performed */
132
133 #define BH_RECEIVE 1
134 #define BH_TRANSMIT 2
135 #define BH_STATUS 4
136
137 #define IO_PIN_SHUTDOWN_LIMIT 100
138
139 struct _input_signal_events {
140 int ri_up;
141 int ri_down;
142 int dsr_up;
143 int dsr_down;
144 int dcd_up;
145 int dcd_down;
146 int cts_up;
147 int cts_down;
148 };
149
150 /*
151 * Device instance data structure
152 */
153 typedef struct _synclinkmp_info {
154 void *if_ptr; /* General purpose pointer (used by SPPP) */
155 int magic;
156 struct tty_port port;
157 int line;
158 unsigned short close_delay;
159 unsigned short closing_wait; /* time to wait before closing */
160
161 struct mgsl_icount icount;
162
163 int timeout;
164 int x_char; /* xon/xoff character */
165 u16 read_status_mask1; /* break detection (SR1 indications) */
166 u16 read_status_mask2; /* parity/framing/overun (SR2 indications) */
167 unsigned char ignore_status_mask1; /* break detection (SR1 indications) */
168 unsigned char ignore_status_mask2; /* parity/framing/overun (SR2 indications) */
169 unsigned char *tx_buf;
170 int tx_put;
171 int tx_get;
172 int tx_count;
173
174 wait_queue_head_t status_event_wait_q;
175 wait_queue_head_t event_wait_q;
176 struct timer_list tx_timer; /* HDLC transmit timeout timer */
177 struct _synclinkmp_info *next_device; /* device list link */
178 struct timer_list status_timer; /* input signal status check timer */
179
180 spinlock_t lock; /* spinlock for synchronizing with ISR */
181 struct work_struct task; /* task structure for scheduling bh */
182
183 u32 max_frame_size; /* as set by device config */
184
185 u32 pending_bh;
186
187 bool bh_running; /* Protection from multiple */
188 int isr_overflow;
189 bool bh_requested;
190
191 int dcd_chkcount; /* check counts to prevent */
192 int cts_chkcount; /* too many IRQs if a signal */
193 int dsr_chkcount; /* is floating */
194 int ri_chkcount;
195
196 char *buffer_list; /* virtual address of Rx & Tx buffer lists */
197 unsigned long buffer_list_phys;
198
199 unsigned int rx_buf_count; /* count of total allocated Rx buffers */
200 SCADESC *rx_buf_list; /* list of receive buffer entries */
201 SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
202 unsigned int current_rx_buf;
203
204 unsigned int tx_buf_count; /* count of total allocated Tx buffers */
205 SCADESC *tx_buf_list; /* list of transmit buffer entries */
206 SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
207 unsigned int last_tx_buf;
208
209 unsigned char *tmp_rx_buf;
210 unsigned int tmp_rx_buf_count;
211
212 bool rx_enabled;
213 bool rx_overflow;
214
215 bool tx_enabled;
216 bool tx_active;
217 u32 idle_mode;
218
219 unsigned char ie0_value;
220 unsigned char ie1_value;
221 unsigned char ie2_value;
222 unsigned char ctrlreg_value;
223 unsigned char old_signals;
224
225 char device_name[25]; /* device instance name */
226
227 int port_count;
228 int adapter_num;
229 int port_num;
230
231 struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
232
233 unsigned int bus_type; /* expansion bus type (ISA,EISA,PCI) */
234
235 unsigned int irq_level; /* interrupt level */
236 unsigned long irq_flags;
237 bool irq_requested; /* true if IRQ requested */
238
239 MGSL_PARAMS params; /* communications parameters */
240
241 unsigned char serial_signals; /* current serial signal states */
242
243 bool irq_occurred; /* for diagnostics use */
244 unsigned int init_error; /* Initialization startup error */
245
246 u32 last_mem_alloc;
247 unsigned char* memory_base; /* shared memory address (PCI only) */
248 u32 phys_memory_base;
249 int shared_mem_requested;
250
251 unsigned char* sca_base; /* HD64570 SCA Memory address */
252 u32 phys_sca_base;
253 u32 sca_offset;
254 bool sca_base_requested;
255
256 unsigned char* lcr_base; /* local config registers (PCI only) */
257 u32 phys_lcr_base;
258 u32 lcr_offset;
259 int lcr_mem_requested;
260
261 unsigned char* statctrl_base; /* status/control register memory */
262 u32 phys_statctrl_base;
263 u32 statctrl_offset;
264 bool sca_statctrl_requested;
265
266 u32 misc_ctrl_value;
267 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
268 char char_buf[MAX_ASYNC_BUFFER_SIZE];
269 bool drop_rts_on_tx_done;
270
271 struct _input_signal_events input_signal_events;
272
273 /* SPPP/Cisco HDLC device parts */
274 int netcount;
275 spinlock_t netlock;
276
277 #if SYNCLINK_GENERIC_HDLC
278 struct net_device *netdev;
279 #endif
280
281 } SLMP_INFO;
282
283 #define MGSL_MAGIC 0x5401
284
285 /*
286 * define serial signal status change macros
287 */
288 #define MISCSTATUS_DCD_LATCHED (SerialSignal_DCD<<8) /* indicates change in DCD */
289 #define MISCSTATUS_RI_LATCHED (SerialSignal_RI<<8) /* indicates change in RI */
290 #define MISCSTATUS_CTS_LATCHED (SerialSignal_CTS<<8) /* indicates change in CTS */
291 #define MISCSTATUS_DSR_LATCHED (SerialSignal_DSR<<8) /* change in DSR */
292
293 /* Common Register macros */
294 #define LPR 0x00
295 #define PABR0 0x02
296 #define PABR1 0x03
297 #define WCRL 0x04
298 #define WCRM 0x05
299 #define WCRH 0x06
300 #define DPCR 0x08
301 #define DMER 0x09
302 #define ISR0 0x10
303 #define ISR1 0x11
304 #define ISR2 0x12
305 #define IER0 0x14
306 #define IER1 0x15
307 #define IER2 0x16
308 #define ITCR 0x18
309 #define INTVR 0x1a
310 #define IMVR 0x1c
311
312 /* MSCI Register macros */
313 #define TRB 0x20
314 #define TRBL 0x20
315 #define TRBH 0x21
316 #define SR0 0x22
317 #define SR1 0x23
318 #define SR2 0x24
319 #define SR3 0x25
320 #define FST 0x26
321 #define IE0 0x28
322 #define IE1 0x29
323 #define IE2 0x2a
324 #define FIE 0x2b
325 #define CMD 0x2c
326 #define MD0 0x2e
327 #define MD1 0x2f
328 #define MD2 0x30
329 #define CTL 0x31
330 #define SA0 0x32
331 #define SA1 0x33
332 #define IDL 0x34
333 #define TMC 0x35
334 #define RXS 0x36
335 #define TXS 0x37
336 #define TRC0 0x38
337 #define TRC1 0x39
338 #define RRC 0x3a
339 #define CST0 0x3c
340 #define CST1 0x3d
341
342 /* Timer Register Macros */
343 #define TCNT 0x60
344 #define TCNTL 0x60
345 #define TCNTH 0x61
346 #define TCONR 0x62
347 #define TCONRL 0x62
348 #define TCONRH 0x63
349 #define TMCS 0x64
350 #define TEPR 0x65
351
352 /* DMA Controller Register macros */
353 #define DARL 0x80
354 #define DARH 0x81
355 #define DARB 0x82
356 #define BAR 0x80
357 #define BARL 0x80
358 #define BARH 0x81
359 #define BARB 0x82
360 #define SAR 0x84
361 #define SARL 0x84
362 #define SARH 0x85
363 #define SARB 0x86
364 #define CPB 0x86
365 #define CDA 0x88
366 #define CDAL 0x88
367 #define CDAH 0x89
368 #define EDA 0x8a
369 #define EDAL 0x8a
370 #define EDAH 0x8b
371 #define BFL 0x8c
372 #define BFLL 0x8c
373 #define BFLH 0x8d
374 #define BCR 0x8e
375 #define BCRL 0x8e
376 #define BCRH 0x8f
377 #define DSR 0x90
378 #define DMR 0x91
379 #define FCT 0x93
380 #define DIR 0x94
381 #define DCMD 0x95
382
383 /* combine with timer or DMA register address */
384 #define TIMER0 0x00
385 #define TIMER1 0x08
386 #define TIMER2 0x10
387 #define TIMER3 0x18
388 #define RXDMA 0x00
389 #define TXDMA 0x20
390
391 /* SCA Command Codes */
392 #define NOOP 0x00
393 #define TXRESET 0x01
394 #define TXENABLE 0x02
395 #define TXDISABLE 0x03
396 #define TXCRCINIT 0x04
397 #define TXCRCEXCL 0x05
398 #define TXEOM 0x06
399 #define TXABORT 0x07
400 #define MPON 0x08
401 #define TXBUFCLR 0x09
402 #define RXRESET 0x11
403 #define RXENABLE 0x12
404 #define RXDISABLE 0x13
405 #define RXCRCINIT 0x14
406 #define RXREJECT 0x15
407 #define SEARCHMP 0x16
408 #define RXCRCEXCL 0x17
409 #define RXCRCCALC 0x18
410 #define CHRESET 0x21
411 #define HUNT 0x31
412
413 /* DMA command codes */
414 #define SWABORT 0x01
415 #define FEICLEAR 0x02
416
417 /* IE0 */
418 #define TXINTE BIT7
419 #define RXINTE BIT6
420 #define TXRDYE BIT1
421 #define RXRDYE BIT0
422
423 /* IE1 & SR1 */
424 #define UDRN BIT7
425 #define IDLE BIT6
426 #define SYNCD BIT4
427 #define FLGD BIT4
428 #define CCTS BIT3
429 #define CDCD BIT2
430 #define BRKD BIT1
431 #define ABTD BIT1
432 #define GAPD BIT1
433 #define BRKE BIT0
434 #define IDLD BIT0
435
436 /* IE2 & SR2 */
437 #define EOM BIT7
438 #define PMP BIT6
439 #define SHRT BIT6
440 #define PE BIT5
441 #define ABT BIT5
442 #define FRME BIT4
443 #define RBIT BIT4
444 #define OVRN BIT3
445 #define CRCE BIT2
446
447
448 /*
449 * Global linked list of SyncLink devices
450 */
451 static SLMP_INFO *synclinkmp_device_list = NULL;
452 static int synclinkmp_adapter_count = -1;
453 static int synclinkmp_device_count = 0;
454
455 /*
456 * Set this param to non-zero to load eax with the
457 * .text section address and breakpoint on module load.
458 * This is useful for use with gdb and add-symbol-file command.
459 */
460 static int break_on_load = 0;
461
462 /*
463 * Driver major number, defaults to zero to get auto
464 * assigned major number. May be forced as module parameter.
465 */
466 static int ttymajor = 0;
467
468 /*
469 * Array of user specified options for ISA adapters.
470 */
471 static int debug_level = 0;
472 static int maxframe[MAX_DEVICES] = {0,};
473
474 module_param(break_on_load, bool, 0);
475 module_param(ttymajor, int, 0);
476 module_param(debug_level, int, 0);
477 module_param_array(maxframe, int, NULL, 0);
478
479 static char *driver_name = "SyncLink MultiPort driver";
480 static char *driver_version = "$Revision: 4.38 $";
481
482 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
483 static void synclinkmp_remove_one(struct pci_dev *dev);
484
485 static struct pci_device_id synclinkmp_pci_tbl[] = {
486 { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
487 { 0, }, /* terminate list */
488 };
489 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
490
491 MODULE_LICENSE("GPL");
492
493 static struct pci_driver synclinkmp_pci_driver = {
494 .name = "synclinkmp",
495 .id_table = synclinkmp_pci_tbl,
496 .probe = synclinkmp_init_one,
497 .remove = __devexit_p(synclinkmp_remove_one),
498 };
499
500
501 static struct tty_driver *serial_driver;
502
503 /* number of characters left in xmit buffer before we ask for more */
504 #define WAKEUP_CHARS 256
505
506
507 /* tty callbacks */
508
509 static int open(struct tty_struct *tty, struct file * filp);
510 static void close(struct tty_struct *tty, struct file * filp);
511 static void hangup(struct tty_struct *tty);
512 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
513
514 static int write(struct tty_struct *tty, const unsigned char *buf, int count);
515 static int put_char(struct tty_struct *tty, unsigned char ch);
516 static void send_xchar(struct tty_struct *tty, char ch);
517 static void wait_until_sent(struct tty_struct *tty, int timeout);
518 static int write_room(struct tty_struct *tty);
519 static void flush_chars(struct tty_struct *tty);
520 static void flush_buffer(struct tty_struct *tty);
521 static void tx_hold(struct tty_struct *tty);
522 static void tx_release(struct tty_struct *tty);
523
524 static int ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
525 static int chars_in_buffer(struct tty_struct *tty);
526 static void throttle(struct tty_struct * tty);
527 static void unthrottle(struct tty_struct * tty);
528 static int set_break(struct tty_struct *tty, int break_state);
529
530 #if SYNCLINK_GENERIC_HDLC
531 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
532 static void hdlcdev_tx_done(SLMP_INFO *info);
533 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
534 static int hdlcdev_init(SLMP_INFO *info);
535 static void hdlcdev_exit(SLMP_INFO *info);
536 #endif
537
538 /* ioctl handlers */
539
540 static int get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
541 static int get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
542 static int set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
543 static int get_txidle(SLMP_INFO *info, int __user *idle_mode);
544 static int set_txidle(SLMP_INFO *info, int idle_mode);
545 static int tx_enable(SLMP_INFO *info, int enable);
546 static int tx_abort(SLMP_INFO *info);
547 static int rx_enable(SLMP_INFO *info, int enable);
548 static int modem_input_wait(SLMP_INFO *info,int arg);
549 static int wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
550 static int tiocmget(struct tty_struct *tty, struct file *file);
551 static int tiocmset(struct tty_struct *tty, struct file *file,
552 unsigned int set, unsigned int clear);
553 static int set_break(struct tty_struct *tty, int break_state);
554
555 static void add_device(SLMP_INFO *info);
556 static void device_init(int adapter_num, struct pci_dev *pdev);
557 static int claim_resources(SLMP_INFO *info);
558 static void release_resources(SLMP_INFO *info);
559
560 static int startup(SLMP_INFO *info);
561 static int block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
562 static int carrier_raised(struct tty_port *port);
563 static void shutdown(SLMP_INFO *info);
564 static void program_hw(SLMP_INFO *info);
565 static void change_params(SLMP_INFO *info);
566
567 static bool init_adapter(SLMP_INFO *info);
568 static bool register_test(SLMP_INFO *info);
569 static bool irq_test(SLMP_INFO *info);
570 static bool loopback_test(SLMP_INFO *info);
571 static int adapter_test(SLMP_INFO *info);
572 static bool memory_test(SLMP_INFO *info);
573
574 static void reset_adapter(SLMP_INFO *info);
575 static void reset_port(SLMP_INFO *info);
576 static void async_mode(SLMP_INFO *info);
577 static void hdlc_mode(SLMP_INFO *info);
578
579 static void rx_stop(SLMP_INFO *info);
580 static void rx_start(SLMP_INFO *info);
581 static void rx_reset_buffers(SLMP_INFO *info);
582 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
583 static bool rx_get_frame(SLMP_INFO *info);
584
585 static void tx_start(SLMP_INFO *info);
586 static void tx_stop(SLMP_INFO *info);
587 static void tx_load_fifo(SLMP_INFO *info);
588 static void tx_set_idle(SLMP_INFO *info);
589 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
590
591 static void get_signals(SLMP_INFO *info);
592 static void set_signals(SLMP_INFO *info);
593 static void enable_loopback(SLMP_INFO *info, int enable);
594 static void set_rate(SLMP_INFO *info, u32 data_rate);
595
596 static int bh_action(SLMP_INFO *info);
597 static void bh_handler(struct work_struct *work);
598 static void bh_receive(SLMP_INFO *info);
599 static void bh_transmit(SLMP_INFO *info);
600 static void bh_status(SLMP_INFO *info);
601 static void isr_timer(SLMP_INFO *info);
602 static void isr_rxint(SLMP_INFO *info);
603 static void isr_rxrdy(SLMP_INFO *info);
604 static void isr_txint(SLMP_INFO *info);
605 static void isr_txrdy(SLMP_INFO *info);
606 static void isr_rxdmaok(SLMP_INFO *info);
607 static void isr_rxdmaerror(SLMP_INFO *info);
608 static void isr_txdmaok(SLMP_INFO *info);
609 static void isr_txdmaerror(SLMP_INFO *info);
610 static void isr_io_pin(SLMP_INFO *info, u16 status);
611
612 static int alloc_dma_bufs(SLMP_INFO *info);
613 static void free_dma_bufs(SLMP_INFO *info);
614 static int alloc_buf_list(SLMP_INFO *info);
615 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
616 static int alloc_tmp_rx_buf(SLMP_INFO *info);
617 static void free_tmp_rx_buf(SLMP_INFO *info);
618
619 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
620 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
621 static void tx_timeout(unsigned long context);
622 static void status_timeout(unsigned long context);
623
624 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
625 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
626 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
627 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
628 static unsigned char read_status_reg(SLMP_INFO * info);
629 static void write_control_reg(SLMP_INFO * info);
630
631
632 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
633 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
634 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
635
636 static u32 misc_ctrl_value = 0x007e4040;
637 static u32 lcr1_brdr_value = 0x00800028;
638
639 static u32 read_ahead_count = 8;
640
641 /* DPCR, DMA Priority Control
642 *
643 * 07..05 Not used, must be 0
644 * 04 BRC, bus release condition: 0=all transfers complete
645 * 1=release after 1 xfer on all channels
646 * 03 CCC, channel change condition: 0=every cycle
647 * 1=after each channel completes all xfers
648 * 02..00 PR<2..0>, priority 100=round robin
649 *
650 * 00000100 = 0x00
651 */
652 static unsigned char dma_priority = 0x04;
653
654 // Number of bytes that can be written to shared RAM
655 // in a single write operation
656 static u32 sca_pci_load_interval = 64;
657
658 /*
659 * 1st function defined in .text section. Calling this function in
660 * init_module() followed by a breakpoint allows a remote debugger
661 * (gdb) to get the .text address for the add-symbol-file command.
662 * This allows remote debugging of dynamically loadable modules.
663 */
664 static void* synclinkmp_get_text_ptr(void);
665 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
666
667 static inline int sanity_check(SLMP_INFO *info,
668 char *name, const char *routine)
669 {
670 #ifdef SANITY_CHECK
671 static const char *badmagic =
672 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
673 static const char *badinfo =
674 "Warning: null synclinkmp_struct for (%s) in %s\n";
675
676 if (!info) {
677 printk(badinfo, name, routine);
678 return 1;
679 }
680 if (info->magic != MGSL_MAGIC) {
681 printk(badmagic, name, routine);
682 return 1;
683 }
684 #else
685 if (!info)
686 return 1;
687 #endif
688 return 0;
689 }
690
691 /**
692 * line discipline callback wrappers
693 *
694 * The wrappers maintain line discipline references
695 * while calling into the line discipline.
696 *
697 * ldisc_receive_buf - pass receive data to line discipline
698 */
699
700 static void ldisc_receive_buf(struct tty_struct *tty,
701 const __u8 *data, char *flags, int count)
702 {
703 struct tty_ldisc *ld;
704 if (!tty)
705 return;
706 ld = tty_ldisc_ref(tty);
707 if (ld) {
708 if (ld->ops->receive_buf)
709 ld->ops->receive_buf(tty, data, flags, count);
710 tty_ldisc_deref(ld);
711 }
712 }
713
714 /* tty callbacks */
715
716 /* Called when a port is opened. Init and enable port.
717 */
718 static int open(struct tty_struct *tty, struct file *filp)
719 {
720 SLMP_INFO *info;
721 int retval, line;
722 unsigned long flags;
723
724 line = tty->index;
725 if ((line < 0) || (line >= synclinkmp_device_count)) {
726 printk("%s(%d): open with invalid line #%d.\n",
727 __FILE__,__LINE__,line);
728 return -ENODEV;
729 }
730
731 info = synclinkmp_device_list;
732 while(info && info->line != line)
733 info = info->next_device;
734 if (sanity_check(info, tty->name, "open"))
735 return -ENODEV;
736 if ( info->init_error ) {
737 printk("%s(%d):%s device is not allocated, init error=%d\n",
738 __FILE__,__LINE__,info->device_name,info->init_error);
739 return -ENODEV;
740 }
741
742 tty->driver_data = info;
743 info->port.tty = tty;
744
745 if (debug_level >= DEBUG_LEVEL_INFO)
746 printk("%s(%d):%s open(), old ref count = %d\n",
747 __FILE__,__LINE__,tty->driver->name, info->port.count);
748
749 /* If port is closing, signal caller to try again */
750 if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
751 if (info->port.flags & ASYNC_CLOSING)
752 interruptible_sleep_on(&info->port.close_wait);
753 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
754 -EAGAIN : -ERESTARTSYS);
755 goto cleanup;
756 }
757
758 info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
759
760 spin_lock_irqsave(&info->netlock, flags);
761 if (info->netcount) {
762 retval = -EBUSY;
763 spin_unlock_irqrestore(&info->netlock, flags);
764 goto cleanup;
765 }
766 info->port.count++;
767 spin_unlock_irqrestore(&info->netlock, flags);
768
769 if (info->port.count == 1) {
770 /* 1st open on this device, init hardware */
771 retval = startup(info);
772 if (retval < 0)
773 goto cleanup;
774 }
775
776 retval = block_til_ready(tty, filp, info);
777 if (retval) {
778 if (debug_level >= DEBUG_LEVEL_INFO)
779 printk("%s(%d):%s block_til_ready() returned %d\n",
780 __FILE__,__LINE__, info->device_name, retval);
781 goto cleanup;
782 }
783
784 if (debug_level >= DEBUG_LEVEL_INFO)
785 printk("%s(%d):%s open() success\n",
786 __FILE__,__LINE__, info->device_name);
787 retval = 0;
788
789 cleanup:
790 if (retval) {
791 if (tty->count == 1)
792 info->port.tty = NULL; /* tty layer will release tty struct */
793 if(info->port.count)
794 info->port.count--;
795 }
796
797 return retval;
798 }
799
800 /* Called when port is closed. Wait for remaining data to be
801 * sent. Disable port and free resources.
802 */
803 static void close(struct tty_struct *tty, struct file *filp)
804 {
805 SLMP_INFO * info = tty->driver_data;
806
807 if (sanity_check(info, tty->name, "close"))
808 return;
809
810 if (debug_level >= DEBUG_LEVEL_INFO)
811 printk("%s(%d):%s close() entry, count=%d\n",
812 __FILE__,__LINE__, info->device_name, info->port.count);
813
814 if (tty_port_close_start(&info->port, tty, filp) == 0)
815 goto cleanup;
816
817 if (info->port.flags & ASYNC_INITIALIZED)
818 wait_until_sent(tty, info->timeout);
819
820 flush_buffer(tty);
821 tty_ldisc_flush(tty);
822 shutdown(info);
823
824 tty_port_close_end(&info->port, tty);
825 info->port.tty = NULL;
826 cleanup:
827 if (debug_level >= DEBUG_LEVEL_INFO)
828 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
829 tty->driver->name, info->port.count);
830 }
831
832 /* Called by tty_hangup() when a hangup is signaled.
833 * This is the same as closing all open descriptors for the port.
834 */
835 static void hangup(struct tty_struct *tty)
836 {
837 SLMP_INFO *info = tty->driver_data;
838
839 if (debug_level >= DEBUG_LEVEL_INFO)
840 printk("%s(%d):%s hangup()\n",
841 __FILE__,__LINE__, info->device_name );
842
843 if (sanity_check(info, tty->name, "hangup"))
844 return;
845
846 flush_buffer(tty);
847 shutdown(info);
848
849 info->port.count = 0;
850 info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
851 info->port.tty = NULL;
852
853 wake_up_interruptible(&info->port.open_wait);
854 }
855
856 /* Set new termios settings
857 */
858 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
859 {
860 SLMP_INFO *info = tty->driver_data;
861 unsigned long flags;
862
863 if (debug_level >= DEBUG_LEVEL_INFO)
864 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
865 tty->driver->name );
866
867 change_params(info);
868
869 /* Handle transition to B0 status */
870 if (old_termios->c_cflag & CBAUD &&
871 !(tty->termios->c_cflag & CBAUD)) {
872 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
873 spin_lock_irqsave(&info->lock,flags);
874 set_signals(info);
875 spin_unlock_irqrestore(&info->lock,flags);
876 }
877
878 /* Handle transition away from B0 status */
879 if (!(old_termios->c_cflag & CBAUD) &&
880 tty->termios->c_cflag & CBAUD) {
881 info->serial_signals |= SerialSignal_DTR;
882 if (!(tty->termios->c_cflag & CRTSCTS) ||
883 !test_bit(TTY_THROTTLED, &tty->flags)) {
884 info->serial_signals |= SerialSignal_RTS;
885 }
886 spin_lock_irqsave(&info->lock,flags);
887 set_signals(info);
888 spin_unlock_irqrestore(&info->lock,flags);
889 }
890
891 /* Handle turning off CRTSCTS */
892 if (old_termios->c_cflag & CRTSCTS &&
893 !(tty->termios->c_cflag & CRTSCTS)) {
894 tty->hw_stopped = 0;
895 tx_release(tty);
896 }
897 }
898
899 /* Send a block of data
900 *
901 * Arguments:
902 *
903 * tty pointer to tty information structure
904 * buf pointer to buffer containing send data
905 * count size of send data in bytes
906 *
907 * Return Value: number of characters written
908 */
909 static int write(struct tty_struct *tty,
910 const unsigned char *buf, int count)
911 {
912 int c, ret = 0;
913 SLMP_INFO *info = tty->driver_data;
914 unsigned long flags;
915
916 if (debug_level >= DEBUG_LEVEL_INFO)
917 printk("%s(%d):%s write() count=%d\n",
918 __FILE__,__LINE__,info->device_name,count);
919
920 if (sanity_check(info, tty->name, "write"))
921 goto cleanup;
922
923 if (!info->tx_buf)
924 goto cleanup;
925
926 if (info->params.mode == MGSL_MODE_HDLC) {
927 if (count > info->max_frame_size) {
928 ret = -EIO;
929 goto cleanup;
930 }
931 if (info->tx_active)
932 goto cleanup;
933 if (info->tx_count) {
934 /* send accumulated data from send_char() calls */
935 /* as frame and wait before accepting more data. */
936 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
937 goto start;
938 }
939 ret = info->tx_count = count;
940 tx_load_dma_buffer(info, buf, count);
941 goto start;
942 }
943
944 for (;;) {
945 c = min_t(int, count,
946 min(info->max_frame_size - info->tx_count - 1,
947 info->max_frame_size - info->tx_put));
948 if (c <= 0)
949 break;
950
951 memcpy(info->tx_buf + info->tx_put, buf, c);
952
953 spin_lock_irqsave(&info->lock,flags);
954 info->tx_put += c;
955 if (info->tx_put >= info->max_frame_size)
956 info->tx_put -= info->max_frame_size;
957 info->tx_count += c;
958 spin_unlock_irqrestore(&info->lock,flags);
959
960 buf += c;
961 count -= c;
962 ret += c;
963 }
964
965 if (info->params.mode == MGSL_MODE_HDLC) {
966 if (count) {
967 ret = info->tx_count = 0;
968 goto cleanup;
969 }
970 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
971 }
972 start:
973 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
974 spin_lock_irqsave(&info->lock,flags);
975 if (!info->tx_active)
976 tx_start(info);
977 spin_unlock_irqrestore(&info->lock,flags);
978 }
979
980 cleanup:
981 if (debug_level >= DEBUG_LEVEL_INFO)
982 printk( "%s(%d):%s write() returning=%d\n",
983 __FILE__,__LINE__,info->device_name,ret);
984 return ret;
985 }
986
987 /* Add a character to the transmit buffer.
988 */
989 static int put_char(struct tty_struct *tty, unsigned char ch)
990 {
991 SLMP_INFO *info = tty->driver_data;
992 unsigned long flags;
993 int ret = 0;
994
995 if ( debug_level >= DEBUG_LEVEL_INFO ) {
996 printk( "%s(%d):%s put_char(%d)\n",
997 __FILE__,__LINE__,info->device_name,ch);
998 }
999
1000 if (sanity_check(info, tty->name, "put_char"))
1001 return 0;
1002
1003 if (!info->tx_buf)
1004 return 0;
1005
1006 spin_lock_irqsave(&info->lock,flags);
1007
1008 if ( (info->params.mode != MGSL_MODE_HDLC) ||
1009 !info->tx_active ) {
1010
1011 if (info->tx_count < info->max_frame_size - 1) {
1012 info->tx_buf[info->tx_put++] = ch;
1013 if (info->tx_put >= info->max_frame_size)
1014 info->tx_put -= info->max_frame_size;
1015 info->tx_count++;
1016 ret = 1;
1017 }
1018 }
1019
1020 spin_unlock_irqrestore(&info->lock,flags);
1021 return ret;
1022 }
1023
1024 /* Send a high-priority XON/XOFF character
1025 */
1026 static void send_xchar(struct tty_struct *tty, char ch)
1027 {
1028 SLMP_INFO *info = tty->driver_data;
1029 unsigned long flags;
1030
1031 if (debug_level >= DEBUG_LEVEL_INFO)
1032 printk("%s(%d):%s send_xchar(%d)\n",
1033 __FILE__,__LINE__, info->device_name, ch );
1034
1035 if (sanity_check(info, tty->name, "send_xchar"))
1036 return;
1037
1038 info->x_char = ch;
1039 if (ch) {
1040 /* Make sure transmit interrupts are on */
1041 spin_lock_irqsave(&info->lock,flags);
1042 if (!info->tx_enabled)
1043 tx_start(info);
1044 spin_unlock_irqrestore(&info->lock,flags);
1045 }
1046 }
1047
1048 /* Wait until the transmitter is empty.
1049 */
1050 static void wait_until_sent(struct tty_struct *tty, int timeout)
1051 {
1052 SLMP_INFO * info = tty->driver_data;
1053 unsigned long orig_jiffies, char_time;
1054
1055 if (!info )
1056 return;
1057
1058 if (debug_level >= DEBUG_LEVEL_INFO)
1059 printk("%s(%d):%s wait_until_sent() entry\n",
1060 __FILE__,__LINE__, info->device_name );
1061
1062 if (sanity_check(info, tty->name, "wait_until_sent"))
1063 return;
1064
1065 lock_kernel();
1066
1067 if (!(info->port.flags & ASYNC_INITIALIZED))
1068 goto exit;
1069
1070 orig_jiffies = jiffies;
1071
1072 /* Set check interval to 1/5 of estimated time to
1073 * send a character, and make it at least 1. The check
1074 * interval should also be less than the timeout.
1075 * Note: use tight timings here to satisfy the NIST-PCTS.
1076 */
1077
1078 if ( info->params.data_rate ) {
1079 char_time = info->timeout/(32 * 5);
1080 if (!char_time)
1081 char_time++;
1082 } else
1083 char_time = 1;
1084
1085 if (timeout)
1086 char_time = min_t(unsigned long, char_time, timeout);
1087
1088 if ( info->params.mode == MGSL_MODE_HDLC ) {
1089 while (info->tx_active) {
1090 msleep_interruptible(jiffies_to_msecs(char_time));
1091 if (signal_pending(current))
1092 break;
1093 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1094 break;
1095 }
1096 } else {
1097 //TODO: determine if there is something similar to USC16C32
1098 // TXSTATUS_ALL_SENT status
1099 while ( info->tx_active && info->tx_enabled) {
1100 msleep_interruptible(jiffies_to_msecs(char_time));
1101 if (signal_pending(current))
1102 break;
1103 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1104 break;
1105 }
1106 }
1107
1108 exit:
1109 unlock_kernel();
1110 if (debug_level >= DEBUG_LEVEL_INFO)
1111 printk("%s(%d):%s wait_until_sent() exit\n",
1112 __FILE__,__LINE__, info->device_name );
1113 }
1114
1115 /* Return the count of free bytes in transmit buffer
1116 */
1117 static int write_room(struct tty_struct *tty)
1118 {
1119 SLMP_INFO *info = tty->driver_data;
1120 int ret;
1121
1122 if (sanity_check(info, tty->name, "write_room"))
1123 return 0;
1124
1125 lock_kernel();
1126 if (info->params.mode == MGSL_MODE_HDLC) {
1127 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1128 } else {
1129 ret = info->max_frame_size - info->tx_count - 1;
1130 if (ret < 0)
1131 ret = 0;
1132 }
1133 unlock_kernel();
1134
1135 if (debug_level >= DEBUG_LEVEL_INFO)
1136 printk("%s(%d):%s write_room()=%d\n",
1137 __FILE__, __LINE__, info->device_name, ret);
1138
1139 return ret;
1140 }
1141
1142 /* enable transmitter and send remaining buffered characters
1143 */
1144 static void flush_chars(struct tty_struct *tty)
1145 {
1146 SLMP_INFO *info = tty->driver_data;
1147 unsigned long flags;
1148
1149 if ( debug_level >= DEBUG_LEVEL_INFO )
1150 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1151 __FILE__,__LINE__,info->device_name,info->tx_count);
1152
1153 if (sanity_check(info, tty->name, "flush_chars"))
1154 return;
1155
1156 if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1157 !info->tx_buf)
1158 return;
1159
1160 if ( debug_level >= DEBUG_LEVEL_INFO )
1161 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1162 __FILE__,__LINE__,info->device_name );
1163
1164 spin_lock_irqsave(&info->lock,flags);
1165
1166 if (!info->tx_active) {
1167 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1168 info->tx_count ) {
1169 /* operating in synchronous (frame oriented) mode */
1170 /* copy data from circular tx_buf to */
1171 /* transmit DMA buffer. */
1172 tx_load_dma_buffer(info,
1173 info->tx_buf,info->tx_count);
1174 }
1175 tx_start(info);
1176 }
1177
1178 spin_unlock_irqrestore(&info->lock,flags);
1179 }
1180
1181 /* Discard all data in the send buffer
1182 */
1183 static void flush_buffer(struct tty_struct *tty)
1184 {
1185 SLMP_INFO *info = tty->driver_data;
1186 unsigned long flags;
1187
1188 if (debug_level >= DEBUG_LEVEL_INFO)
1189 printk("%s(%d):%s flush_buffer() entry\n",
1190 __FILE__,__LINE__, info->device_name );
1191
1192 if (sanity_check(info, tty->name, "flush_buffer"))
1193 return;
1194
1195 spin_lock_irqsave(&info->lock,flags);
1196 info->tx_count = info->tx_put = info->tx_get = 0;
1197 del_timer(&info->tx_timer);
1198 spin_unlock_irqrestore(&info->lock,flags);
1199
1200 tty_wakeup(tty);
1201 }
1202
1203 /* throttle (stop) transmitter
1204 */
1205 static void tx_hold(struct tty_struct *tty)
1206 {
1207 SLMP_INFO *info = tty->driver_data;
1208 unsigned long flags;
1209
1210 if (sanity_check(info, tty->name, "tx_hold"))
1211 return;
1212
1213 if ( debug_level >= DEBUG_LEVEL_INFO )
1214 printk("%s(%d):%s tx_hold()\n",
1215 __FILE__,__LINE__,info->device_name);
1216
1217 spin_lock_irqsave(&info->lock,flags);
1218 if (info->tx_enabled)
1219 tx_stop(info);
1220 spin_unlock_irqrestore(&info->lock,flags);
1221 }
1222
1223 /* release (start) transmitter
1224 */
1225 static void tx_release(struct tty_struct *tty)
1226 {
1227 SLMP_INFO *info = tty->driver_data;
1228 unsigned long flags;
1229
1230 if (sanity_check(info, tty->name, "tx_release"))
1231 return;
1232
1233 if ( debug_level >= DEBUG_LEVEL_INFO )
1234 printk("%s(%d):%s tx_release()\n",
1235 __FILE__,__LINE__,info->device_name);
1236
1237 spin_lock_irqsave(&info->lock,flags);
1238 if (!info->tx_enabled)
1239 tx_start(info);
1240 spin_unlock_irqrestore(&info->lock,flags);
1241 }
1242
1243 /* Service an IOCTL request
1244 *
1245 * Arguments:
1246 *
1247 * tty pointer to tty instance data
1248 * file pointer to associated file object for device
1249 * cmd IOCTL command code
1250 * arg command argument/context
1251 *
1252 * Return Value: 0 if success, otherwise error code
1253 */
1254 static int do_ioctl(struct tty_struct *tty, struct file *file,
1255 unsigned int cmd, unsigned long arg)
1256 {
1257 SLMP_INFO *info = tty->driver_data;
1258 int error;
1259 struct mgsl_icount cnow; /* kernel counter temps */
1260 struct serial_icounter_struct __user *p_cuser; /* user space */
1261 unsigned long flags;
1262 void __user *argp = (void __user *)arg;
1263
1264 if (debug_level >= DEBUG_LEVEL_INFO)
1265 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1266 info->device_name, cmd );
1267
1268 if (sanity_check(info, tty->name, "ioctl"))
1269 return -ENODEV;
1270
1271 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1272 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1273 if (tty->flags & (1 << TTY_IO_ERROR))
1274 return -EIO;
1275 }
1276
1277 switch (cmd) {
1278 case MGSL_IOCGPARAMS:
1279 return get_params(info, argp);
1280 case MGSL_IOCSPARAMS:
1281 return set_params(info, argp);
1282 case MGSL_IOCGTXIDLE:
1283 return get_txidle(info, argp);
1284 case MGSL_IOCSTXIDLE:
1285 return set_txidle(info, (int)arg);
1286 case MGSL_IOCTXENABLE:
1287 return tx_enable(info, (int)arg);
1288 case MGSL_IOCRXENABLE:
1289 return rx_enable(info, (int)arg);
1290 case MGSL_IOCTXABORT:
1291 return tx_abort(info);
1292 case MGSL_IOCGSTATS:
1293 return get_stats(info, argp);
1294 case MGSL_IOCWAITEVENT:
1295 return wait_mgsl_event(info, argp);
1296 case MGSL_IOCLOOPTXDONE:
1297 return 0; // TODO: Not supported, need to document
1298 /* Wait for modem input (DCD,RI,DSR,CTS) change
1299 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1300 */
1301 case TIOCMIWAIT:
1302 return modem_input_wait(info,(int)arg);
1303
1304 /*
1305 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1306 * Return: write counters to the user passed counter struct
1307 * NB: both 1->0 and 0->1 transitions are counted except for
1308 * RI where only 0->1 is counted.
1309 */
1310 case TIOCGICOUNT:
1311 spin_lock_irqsave(&info->lock,flags);
1312 cnow = info->icount;
1313 spin_unlock_irqrestore(&info->lock,flags);
1314 p_cuser = argp;
1315 PUT_USER(error,cnow.cts, &p_cuser->cts);
1316 if (error) return error;
1317 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
1318 if (error) return error;
1319 PUT_USER(error,cnow.rng, &p_cuser->rng);
1320 if (error) return error;
1321 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
1322 if (error) return error;
1323 PUT_USER(error,cnow.rx, &p_cuser->rx);
1324 if (error) return error;
1325 PUT_USER(error,cnow.tx, &p_cuser->tx);
1326 if (error) return error;
1327 PUT_USER(error,cnow.frame, &p_cuser->frame);
1328 if (error) return error;
1329 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
1330 if (error) return error;
1331 PUT_USER(error,cnow.parity, &p_cuser->parity);
1332 if (error) return error;
1333 PUT_USER(error,cnow.brk, &p_cuser->brk);
1334 if (error) return error;
1335 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
1336 if (error) return error;
1337 return 0;
1338 default:
1339 return -ENOIOCTLCMD;
1340 }
1341 return 0;
1342 }
1343
1344 static int ioctl(struct tty_struct *tty, struct file *file,
1345 unsigned int cmd, unsigned long arg)
1346 {
1347 int ret;
1348 lock_kernel();
1349 ret = do_ioctl(tty, file, cmd, arg);
1350 unlock_kernel();
1351 return ret;
1352 }
1353
1354 /*
1355 * /proc fs routines....
1356 */
1357
1358 static inline void line_info(struct seq_file *m, SLMP_INFO *info)
1359 {
1360 char stat_buf[30];
1361 unsigned long flags;
1362
1363 seq_printf(m, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1364 "\tIRQ=%d MaxFrameSize=%u\n",
1365 info->device_name,
1366 info->phys_sca_base,
1367 info->phys_memory_base,
1368 info->phys_statctrl_base,
1369 info->phys_lcr_base,
1370 info->irq_level,
1371 info->max_frame_size );
1372
1373 /* output current serial signal states */
1374 spin_lock_irqsave(&info->lock,flags);
1375 get_signals(info);
1376 spin_unlock_irqrestore(&info->lock,flags);
1377
1378 stat_buf[0] = 0;
1379 stat_buf[1] = 0;
1380 if (info->serial_signals & SerialSignal_RTS)
1381 strcat(stat_buf, "|RTS");
1382 if (info->serial_signals & SerialSignal_CTS)
1383 strcat(stat_buf, "|CTS");
1384 if (info->serial_signals & SerialSignal_DTR)
1385 strcat(stat_buf, "|DTR");
1386 if (info->serial_signals & SerialSignal_DSR)
1387 strcat(stat_buf, "|DSR");
1388 if (info->serial_signals & SerialSignal_DCD)
1389 strcat(stat_buf, "|CD");
1390 if (info->serial_signals & SerialSignal_RI)
1391 strcat(stat_buf, "|RI");
1392
1393 if (info->params.mode == MGSL_MODE_HDLC) {
1394 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1395 info->icount.txok, info->icount.rxok);
1396 if (info->icount.txunder)
1397 seq_printf(m, " txunder:%d", info->icount.txunder);
1398 if (info->icount.txabort)
1399 seq_printf(m, " txabort:%d", info->icount.txabort);
1400 if (info->icount.rxshort)
1401 seq_printf(m, " rxshort:%d", info->icount.rxshort);
1402 if (info->icount.rxlong)
1403 seq_printf(m, " rxlong:%d", info->icount.rxlong);
1404 if (info->icount.rxover)
1405 seq_printf(m, " rxover:%d", info->icount.rxover);
1406 if (info->icount.rxcrc)
1407 seq_printf(m, " rxlong:%d", info->icount.rxcrc);
1408 } else {
1409 seq_printf(m, "\tASYNC tx:%d rx:%d",
1410 info->icount.tx, info->icount.rx);
1411 if (info->icount.frame)
1412 seq_printf(m, " fe:%d", info->icount.frame);
1413 if (info->icount.parity)
1414 seq_printf(m, " pe:%d", info->icount.parity);
1415 if (info->icount.brk)
1416 seq_printf(m, " brk:%d", info->icount.brk);
1417 if (info->icount.overrun)
1418 seq_printf(m, " oe:%d", info->icount.overrun);
1419 }
1420
1421 /* Append serial signal status to end */
1422 seq_printf(m, " %s\n", stat_buf+1);
1423
1424 seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1425 info->tx_active,info->bh_requested,info->bh_running,
1426 info->pending_bh);
1427 }
1428
1429 /* Called to print information about devices
1430 */
1431 static int synclinkmp_proc_show(struct seq_file *m, void *v)
1432 {
1433 SLMP_INFO *info;
1434
1435 seq_printf(m, "synclinkmp driver:%s\n", driver_version);
1436
1437 info = synclinkmp_device_list;
1438 while( info ) {
1439 line_info(m, info);
1440 info = info->next_device;
1441 }
1442 return 0;
1443 }
1444
1445 static int synclinkmp_proc_open(struct inode *inode, struct file *file)
1446 {
1447 return single_open(file, synclinkmp_proc_show, NULL);
1448 }
1449
1450 static const struct file_operations synclinkmp_proc_fops = {
1451 .owner = THIS_MODULE,
1452 .open = synclinkmp_proc_open,
1453 .read = seq_read,
1454 .llseek = seq_lseek,
1455 .release = single_release,
1456 };
1457
1458 /* Return the count of bytes in transmit buffer
1459 */
1460 static int chars_in_buffer(struct tty_struct *tty)
1461 {
1462 SLMP_INFO *info = tty->driver_data;
1463
1464 if (sanity_check(info, tty->name, "chars_in_buffer"))
1465 return 0;
1466
1467 if (debug_level >= DEBUG_LEVEL_INFO)
1468 printk("%s(%d):%s chars_in_buffer()=%d\n",
1469 __FILE__, __LINE__, info->device_name, info->tx_count);
1470
1471 return info->tx_count;
1472 }
1473
1474 /* Signal remote device to throttle send data (our receive data)
1475 */
1476 static void throttle(struct tty_struct * tty)
1477 {
1478 SLMP_INFO *info = tty->driver_data;
1479 unsigned long flags;
1480
1481 if (debug_level >= DEBUG_LEVEL_INFO)
1482 printk("%s(%d):%s throttle() entry\n",
1483 __FILE__,__LINE__, info->device_name );
1484
1485 if (sanity_check(info, tty->name, "throttle"))
1486 return;
1487
1488 if (I_IXOFF(tty))
1489 send_xchar(tty, STOP_CHAR(tty));
1490
1491 if (tty->termios->c_cflag & CRTSCTS) {
1492 spin_lock_irqsave(&info->lock,flags);
1493 info->serial_signals &= ~SerialSignal_RTS;
1494 set_signals(info);
1495 spin_unlock_irqrestore(&info->lock,flags);
1496 }
1497 }
1498
1499 /* Signal remote device to stop throttling send data (our receive data)
1500 */
1501 static void unthrottle(struct tty_struct * tty)
1502 {
1503 SLMP_INFO *info = tty->driver_data;
1504 unsigned long flags;
1505
1506 if (debug_level >= DEBUG_LEVEL_INFO)
1507 printk("%s(%d):%s unthrottle() entry\n",
1508 __FILE__,__LINE__, info->device_name );
1509
1510 if (sanity_check(info, tty->name, "unthrottle"))
1511 return;
1512
1513 if (I_IXOFF(tty)) {
1514 if (info->x_char)
1515 info->x_char = 0;
1516 else
1517 send_xchar(tty, START_CHAR(tty));
1518 }
1519
1520 if (tty->termios->c_cflag & CRTSCTS) {
1521 spin_lock_irqsave(&info->lock,flags);
1522 info->serial_signals |= SerialSignal_RTS;
1523 set_signals(info);
1524 spin_unlock_irqrestore(&info->lock,flags);
1525 }
1526 }
1527
1528 /* set or clear transmit break condition
1529 * break_state -1=set break condition, 0=clear
1530 */
1531 static int set_break(struct tty_struct *tty, int break_state)
1532 {
1533 unsigned char RegValue;
1534 SLMP_INFO * info = tty->driver_data;
1535 unsigned long flags;
1536
1537 if (debug_level >= DEBUG_LEVEL_INFO)
1538 printk("%s(%d):%s set_break(%d)\n",
1539 __FILE__,__LINE__, info->device_name, break_state);
1540
1541 if (sanity_check(info, tty->name, "set_break"))
1542 return -EINVAL;
1543
1544 spin_lock_irqsave(&info->lock,flags);
1545 RegValue = read_reg(info, CTL);
1546 if (break_state == -1)
1547 RegValue |= BIT3;
1548 else
1549 RegValue &= ~BIT3;
1550 write_reg(info, CTL, RegValue);
1551 spin_unlock_irqrestore(&info->lock,flags);
1552 return 0;
1553 }
1554
1555 #if SYNCLINK_GENERIC_HDLC
1556
1557 /**
1558 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1559 * set encoding and frame check sequence (FCS) options
1560 *
1561 * dev pointer to network device structure
1562 * encoding serial encoding setting
1563 * parity FCS setting
1564 *
1565 * returns 0 if success, otherwise error code
1566 */
1567 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1568 unsigned short parity)
1569 {
1570 SLMP_INFO *info = dev_to_port(dev);
1571 unsigned char new_encoding;
1572 unsigned short new_crctype;
1573
1574 /* return error if TTY interface open */
1575 if (info->port.count)
1576 return -EBUSY;
1577
1578 switch (encoding)
1579 {
1580 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1581 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1582 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1583 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1584 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1585 default: return -EINVAL;
1586 }
1587
1588 switch (parity)
1589 {
1590 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1591 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1592 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1593 default: return -EINVAL;
1594 }
1595
1596 info->params.encoding = new_encoding;
1597 info->params.crc_type = new_crctype;
1598
1599 /* if network interface up, reprogram hardware */
1600 if (info->netcount)
1601 program_hw(info);
1602
1603 return 0;
1604 }
1605
1606 /**
1607 * called by generic HDLC layer to send frame
1608 *
1609 * skb socket buffer containing HDLC frame
1610 * dev pointer to network device structure
1611 *
1612 * returns 0 if success, otherwise error code
1613 */
1614 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1615 {
1616 SLMP_INFO *info = dev_to_port(dev);
1617 unsigned long flags;
1618
1619 if (debug_level >= DEBUG_LEVEL_INFO)
1620 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1621
1622 /* stop sending until this frame completes */
1623 netif_stop_queue(dev);
1624
1625 /* copy data to device buffers */
1626 info->tx_count = skb->len;
1627 tx_load_dma_buffer(info, skb->data, skb->len);
1628
1629 /* update network statistics */
1630 dev->stats.tx_packets++;
1631 dev->stats.tx_bytes += skb->len;
1632
1633 /* done with socket buffer, so free it */
1634 dev_kfree_skb(skb);
1635
1636 /* save start time for transmit timeout detection */
1637 dev->trans_start = jiffies;
1638
1639 /* start hardware transmitter if necessary */
1640 spin_lock_irqsave(&info->lock,flags);
1641 if (!info->tx_active)
1642 tx_start(info);
1643 spin_unlock_irqrestore(&info->lock,flags);
1644
1645 return 0;
1646 }
1647
1648 /**
1649 * called by network layer when interface enabled
1650 * claim resources and initialize hardware
1651 *
1652 * dev pointer to network device structure
1653 *
1654 * returns 0 if success, otherwise error code
1655 */
1656 static int hdlcdev_open(struct net_device *dev)
1657 {
1658 SLMP_INFO *info = dev_to_port(dev);
1659 int rc;
1660 unsigned long flags;
1661
1662 if (debug_level >= DEBUG_LEVEL_INFO)
1663 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1664
1665 /* generic HDLC layer open processing */
1666 if ((rc = hdlc_open(dev)))
1667 return rc;
1668
1669 /* arbitrate between network and tty opens */
1670 spin_lock_irqsave(&info->netlock, flags);
1671 if (info->port.count != 0 || info->netcount != 0) {
1672 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1673 spin_unlock_irqrestore(&info->netlock, flags);
1674 return -EBUSY;
1675 }
1676 info->netcount=1;
1677 spin_unlock_irqrestore(&info->netlock, flags);
1678
1679 /* claim resources and init adapter */
1680 if ((rc = startup(info)) != 0) {
1681 spin_lock_irqsave(&info->netlock, flags);
1682 info->netcount=0;
1683 spin_unlock_irqrestore(&info->netlock, flags);
1684 return rc;
1685 }
1686
1687 /* assert DTR and RTS, apply hardware settings */
1688 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1689 program_hw(info);
1690
1691 /* enable network layer transmit */
1692 dev->trans_start = jiffies;
1693 netif_start_queue(dev);
1694
1695 /* inform generic HDLC layer of current DCD status */
1696 spin_lock_irqsave(&info->lock, flags);
1697 get_signals(info);
1698 spin_unlock_irqrestore(&info->lock, flags);
1699 if (info->serial_signals & SerialSignal_DCD)
1700 netif_carrier_on(dev);
1701 else
1702 netif_carrier_off(dev);
1703 return 0;
1704 }
1705
1706 /**
1707 * called by network layer when interface is disabled
1708 * shutdown hardware and release resources
1709 *
1710 * dev pointer to network device structure
1711 *
1712 * returns 0 if success, otherwise error code
1713 */
1714 static int hdlcdev_close(struct net_device *dev)
1715 {
1716 SLMP_INFO *info = dev_to_port(dev);
1717 unsigned long flags;
1718
1719 if (debug_level >= DEBUG_LEVEL_INFO)
1720 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1721
1722 netif_stop_queue(dev);
1723
1724 /* shutdown adapter and release resources */
1725 shutdown(info);
1726
1727 hdlc_close(dev);
1728
1729 spin_lock_irqsave(&info->netlock, flags);
1730 info->netcount=0;
1731 spin_unlock_irqrestore(&info->netlock, flags);
1732
1733 return 0;
1734 }
1735
1736 /**
1737 * called by network layer to process IOCTL call to network device
1738 *
1739 * dev pointer to network device structure
1740 * ifr pointer to network interface request structure
1741 * cmd IOCTL command code
1742 *
1743 * returns 0 if success, otherwise error code
1744 */
1745 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1746 {
1747 const size_t size = sizeof(sync_serial_settings);
1748 sync_serial_settings new_line;
1749 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1750 SLMP_INFO *info = dev_to_port(dev);
1751 unsigned int flags;
1752
1753 if (debug_level >= DEBUG_LEVEL_INFO)
1754 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1755
1756 /* return error if TTY interface open */
1757 if (info->port.count)
1758 return -EBUSY;
1759
1760 if (cmd != SIOCWANDEV)
1761 return hdlc_ioctl(dev, ifr, cmd);
1762
1763 switch(ifr->ifr_settings.type) {
1764 case IF_GET_IFACE: /* return current sync_serial_settings */
1765
1766 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1767 if (ifr->ifr_settings.size < size) {
1768 ifr->ifr_settings.size = size; /* data size wanted */
1769 return -ENOBUFS;
1770 }
1771
1772 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1773 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1774 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1775 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1776
1777 switch (flags){
1778 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1779 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1780 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1781 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1782 default: new_line.clock_type = CLOCK_DEFAULT;
1783 }
1784
1785 new_line.clock_rate = info->params.clock_speed;
1786 new_line.loopback = info->params.loopback ? 1:0;
1787
1788 if (copy_to_user(line, &new_line, size))
1789 return -EFAULT;
1790 return 0;
1791
1792 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1793
1794 if(!capable(CAP_NET_ADMIN))
1795 return -EPERM;
1796 if (copy_from_user(&new_line, line, size))
1797 return -EFAULT;
1798
1799 switch (new_line.clock_type)
1800 {
1801 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1802 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1803 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1804 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1805 case CLOCK_DEFAULT: flags = info->params.flags &
1806 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1807 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1808 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1809 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1810 default: return -EINVAL;
1811 }
1812
1813 if (new_line.loopback != 0 && new_line.loopback != 1)
1814 return -EINVAL;
1815
1816 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1817 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1818 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1819 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1820 info->params.flags |= flags;
1821
1822 info->params.loopback = new_line.loopback;
1823
1824 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1825 info->params.clock_speed = new_line.clock_rate;
1826 else
1827 info->params.clock_speed = 0;
1828
1829 /* if network interface up, reprogram hardware */
1830 if (info->netcount)
1831 program_hw(info);
1832 return 0;
1833
1834 default:
1835 return hdlc_ioctl(dev, ifr, cmd);
1836 }
1837 }
1838
1839 /**
1840 * called by network layer when transmit timeout is detected
1841 *
1842 * dev pointer to network device structure
1843 */
1844 static void hdlcdev_tx_timeout(struct net_device *dev)
1845 {
1846 SLMP_INFO *info = dev_to_port(dev);
1847 unsigned long flags;
1848
1849 if (debug_level >= DEBUG_LEVEL_INFO)
1850 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1851
1852 dev->stats.tx_errors++;
1853 dev->stats.tx_aborted_errors++;
1854
1855 spin_lock_irqsave(&info->lock,flags);
1856 tx_stop(info);
1857 spin_unlock_irqrestore(&info->lock,flags);
1858
1859 netif_wake_queue(dev);
1860 }
1861
1862 /**
1863 * called by device driver when transmit completes
1864 * reenable network layer transmit if stopped
1865 *
1866 * info pointer to device instance information
1867 */
1868 static void hdlcdev_tx_done(SLMP_INFO *info)
1869 {
1870 if (netif_queue_stopped(info->netdev))
1871 netif_wake_queue(info->netdev);
1872 }
1873
1874 /**
1875 * called by device driver when frame received
1876 * pass frame to network layer
1877 *
1878 * info pointer to device instance information
1879 * buf pointer to buffer contianing frame data
1880 * size count of data bytes in buf
1881 */
1882 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1883 {
1884 struct sk_buff *skb = dev_alloc_skb(size);
1885 struct net_device *dev = info->netdev;
1886
1887 if (debug_level >= DEBUG_LEVEL_INFO)
1888 printk("hdlcdev_rx(%s)\n",dev->name);
1889
1890 if (skb == NULL) {
1891 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
1892 dev->name);
1893 dev->stats.rx_dropped++;
1894 return;
1895 }
1896
1897 memcpy(skb_put(skb, size), buf, size);
1898
1899 skb->protocol = hdlc_type_trans(skb, dev);
1900
1901 dev->stats.rx_packets++;
1902 dev->stats.rx_bytes += size;
1903
1904 netif_rx(skb);
1905 }
1906
1907 static const struct net_device_ops hdlcdev_ops = {
1908 .ndo_open = hdlcdev_open,
1909 .ndo_stop = hdlcdev_close,
1910 .ndo_change_mtu = hdlc_change_mtu,
1911 .ndo_start_xmit = hdlc_start_xmit,
1912 .ndo_do_ioctl = hdlcdev_ioctl,
1913 .ndo_tx_timeout = hdlcdev_tx_timeout,
1914 };
1915
1916 /**
1917 * called by device driver when adding device instance
1918 * do generic HDLC initialization
1919 *
1920 * info pointer to device instance information
1921 *
1922 * returns 0 if success, otherwise error code
1923 */
1924 static int hdlcdev_init(SLMP_INFO *info)
1925 {
1926 int rc;
1927 struct net_device *dev;
1928 hdlc_device *hdlc;
1929
1930 /* allocate and initialize network and HDLC layer objects */
1931
1932 if (!(dev = alloc_hdlcdev(info))) {
1933 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1934 return -ENOMEM;
1935 }
1936
1937 /* for network layer reporting purposes only */
1938 dev->mem_start = info->phys_sca_base;
1939 dev->mem_end = info->phys_sca_base + SCA_BASE_SIZE - 1;
1940 dev->irq = info->irq_level;
1941
1942 /* network layer callbacks and settings */
1943 dev->netdev_ops = &hdlcdev_ops;
1944 dev->watchdog_timeo = 10 * HZ;
1945 dev->tx_queue_len = 50;
1946
1947 /* generic HDLC layer callbacks and settings */
1948 hdlc = dev_to_hdlc(dev);
1949 hdlc->attach = hdlcdev_attach;
1950 hdlc->xmit = hdlcdev_xmit;
1951
1952 /* register objects with HDLC layer */
1953 if ((rc = register_hdlc_device(dev))) {
1954 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1955 free_netdev(dev);
1956 return rc;
1957 }
1958
1959 info->netdev = dev;
1960 return 0;
1961 }
1962
1963 /**
1964 * called by device driver when removing device instance
1965 * do generic HDLC cleanup
1966 *
1967 * info pointer to device instance information
1968 */
1969 static void hdlcdev_exit(SLMP_INFO *info)
1970 {
1971 unregister_hdlc_device(info->netdev);
1972 free_netdev(info->netdev);
1973 info->netdev = NULL;
1974 }
1975
1976 #endif /* CONFIG_HDLC */
1977
1978
1979 /* Return next bottom half action to perform.
1980 * Return Value: BH action code or 0 if nothing to do.
1981 */
1982 static int bh_action(SLMP_INFO *info)
1983 {
1984 unsigned long flags;
1985 int rc = 0;
1986
1987 spin_lock_irqsave(&info->lock,flags);
1988
1989 if (info->pending_bh & BH_RECEIVE) {
1990 info->pending_bh &= ~BH_RECEIVE;
1991 rc = BH_RECEIVE;
1992 } else if (info->pending_bh & BH_TRANSMIT) {
1993 info->pending_bh &= ~BH_TRANSMIT;
1994 rc = BH_TRANSMIT;
1995 } else if (info->pending_bh & BH_STATUS) {
1996 info->pending_bh &= ~BH_STATUS;
1997 rc = BH_STATUS;
1998 }
1999
2000 if (!rc) {
2001 /* Mark BH routine as complete */
2002 info->bh_running = false;
2003 info->bh_requested = false;
2004 }
2005
2006 spin_unlock_irqrestore(&info->lock,flags);
2007
2008 return rc;
2009 }
2010
2011 /* Perform bottom half processing of work items queued by ISR.
2012 */
2013 static void bh_handler(struct work_struct *work)
2014 {
2015 SLMP_INFO *info = container_of(work, SLMP_INFO, task);
2016 int action;
2017
2018 if (!info)
2019 return;
2020
2021 if ( debug_level >= DEBUG_LEVEL_BH )
2022 printk( "%s(%d):%s bh_handler() entry\n",
2023 __FILE__,__LINE__,info->device_name);
2024
2025 info->bh_running = true;
2026
2027 while((action = bh_action(info)) != 0) {
2028
2029 /* Process work item */
2030 if ( debug_level >= DEBUG_LEVEL_BH )
2031 printk( "%s(%d):%s bh_handler() work item action=%d\n",
2032 __FILE__,__LINE__,info->device_name, action);
2033
2034 switch (action) {
2035
2036 case BH_RECEIVE:
2037 bh_receive(info);
2038 break;
2039 case BH_TRANSMIT:
2040 bh_transmit(info);
2041 break;
2042 case BH_STATUS:
2043 bh_status(info);
2044 break;
2045 default:
2046 /* unknown work item ID */
2047 printk("%s(%d):%s Unknown work item ID=%08X!\n",
2048 __FILE__,__LINE__,info->device_name,action);
2049 break;
2050 }
2051 }
2052
2053 if ( debug_level >= DEBUG_LEVEL_BH )
2054 printk( "%s(%d):%s bh_handler() exit\n",
2055 __FILE__,__LINE__,info->device_name);
2056 }
2057
2058 static void bh_receive(SLMP_INFO *info)
2059 {
2060 if ( debug_level >= DEBUG_LEVEL_BH )
2061 printk( "%s(%d):%s bh_receive()\n",
2062 __FILE__,__LINE__,info->device_name);
2063
2064 while( rx_get_frame(info) );
2065 }
2066
2067 static void bh_transmit(SLMP_INFO *info)
2068 {
2069 struct tty_struct *tty = info->port.tty;
2070
2071 if ( debug_level >= DEBUG_LEVEL_BH )
2072 printk( "%s(%d):%s bh_transmit() entry\n",
2073 __FILE__,__LINE__,info->device_name);
2074
2075 if (tty)
2076 tty_wakeup(tty);
2077 }
2078
2079 static void bh_status(SLMP_INFO *info)
2080 {
2081 if ( debug_level >= DEBUG_LEVEL_BH )
2082 printk( "%s(%d):%s bh_status() entry\n",
2083 __FILE__,__LINE__,info->device_name);
2084
2085 info->ri_chkcount = 0;
2086 info->dsr_chkcount = 0;
2087 info->dcd_chkcount = 0;
2088 info->cts_chkcount = 0;
2089 }
2090
2091 static void isr_timer(SLMP_INFO * info)
2092 {
2093 unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2094
2095 /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2096 write_reg(info, IER2, 0);
2097
2098 /* TMCS, Timer Control/Status Register
2099 *
2100 * 07 CMF, Compare match flag (read only) 1=match
2101 * 06 ECMI, CMF Interrupt Enable: 0=disabled
2102 * 05 Reserved, must be 0
2103 * 04 TME, Timer Enable
2104 * 03..00 Reserved, must be 0
2105 *
2106 * 0000 0000
2107 */
2108 write_reg(info, (unsigned char)(timer + TMCS), 0);
2109
2110 info->irq_occurred = true;
2111
2112 if ( debug_level >= DEBUG_LEVEL_ISR )
2113 printk("%s(%d):%s isr_timer()\n",
2114 __FILE__,__LINE__,info->device_name);
2115 }
2116
2117 static void isr_rxint(SLMP_INFO * info)
2118 {
2119 struct tty_struct *tty = info->port.tty;
2120 struct mgsl_icount *icount = &info->icount;
2121 unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2122 unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2123
2124 /* clear status bits */
2125 if (status)
2126 write_reg(info, SR1, status);
2127
2128 if (status2)
2129 write_reg(info, SR2, status2);
2130
2131 if ( debug_level >= DEBUG_LEVEL_ISR )
2132 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2133 __FILE__,__LINE__,info->device_name,status,status2);
2134
2135 if (info->params.mode == MGSL_MODE_ASYNC) {
2136 if (status & BRKD) {
2137 icount->brk++;
2138
2139 /* process break detection if tty control
2140 * is not set to ignore it
2141 */
2142 if ( tty ) {
2143 if (!(status & info->ignore_status_mask1)) {
2144 if (info->read_status_mask1 & BRKD) {
2145 tty_insert_flip_char(tty, 0, TTY_BREAK);
2146 if (info->port.flags & ASYNC_SAK)
2147 do_SAK(tty);
2148 }
2149 }
2150 }
2151 }
2152 }
2153 else {
2154 if (status & (FLGD|IDLD)) {
2155 if (status & FLGD)
2156 info->icount.exithunt++;
2157 else if (status & IDLD)
2158 info->icount.rxidle++;
2159 wake_up_interruptible(&info->event_wait_q);
2160 }
2161 }
2162
2163 if (status & CDCD) {
2164 /* simulate a common modem status change interrupt
2165 * for our handler
2166 */
2167 get_signals( info );
2168 isr_io_pin(info,
2169 MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2170 }
2171 }
2172
2173 /*
2174 * handle async rx data interrupts
2175 */
2176 static void isr_rxrdy(SLMP_INFO * info)
2177 {
2178 u16 status;
2179 unsigned char DataByte;
2180 struct tty_struct *tty = info->port.tty;
2181 struct mgsl_icount *icount = &info->icount;
2182
2183 if ( debug_level >= DEBUG_LEVEL_ISR )
2184 printk("%s(%d):%s isr_rxrdy\n",
2185 __FILE__,__LINE__,info->device_name);
2186
2187 while((status = read_reg(info,CST0)) & BIT0)
2188 {
2189 int flag = 0;
2190 bool over = false;
2191 DataByte = read_reg(info,TRB);
2192
2193 icount->rx++;
2194
2195 if ( status & (PE + FRME + OVRN) ) {
2196 printk("%s(%d):%s rxerr=%04X\n",
2197 __FILE__,__LINE__,info->device_name,status);
2198
2199 /* update error statistics */
2200 if (status & PE)
2201 icount->parity++;
2202 else if (status & FRME)
2203 icount->frame++;
2204 else if (status & OVRN)
2205 icount->overrun++;
2206
2207 /* discard char if tty control flags say so */
2208 if (status & info->ignore_status_mask2)
2209 continue;
2210
2211 status &= info->read_status_mask2;
2212
2213 if ( tty ) {
2214 if (status & PE)
2215 flag = TTY_PARITY;
2216 else if (status & FRME)
2217 flag = TTY_FRAME;
2218 if (status & OVRN) {
2219 /* Overrun is special, since it's
2220 * reported immediately, and doesn't
2221 * affect the current character
2222 */
2223 over = true;
2224 }
2225 }
2226 } /* end of if (error) */
2227
2228 if ( tty ) {
2229 tty_insert_flip_char(tty, DataByte, flag);
2230 if (over)
2231 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
2232 }
2233 }
2234
2235 if ( debug_level >= DEBUG_LEVEL_ISR ) {
2236 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2237 __FILE__,__LINE__,info->device_name,
2238 icount->rx,icount->brk,icount->parity,
2239 icount->frame,icount->overrun);
2240 }
2241
2242 if ( tty )
2243 tty_flip_buffer_push(tty);
2244 }
2245
2246 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2247 {
2248 if ( debug_level >= DEBUG_LEVEL_ISR )
2249 printk("%s(%d):%s isr_txeom status=%02x\n",
2250 __FILE__,__LINE__,info->device_name,status);
2251
2252 write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2253 write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2254 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2255
2256 if (status & UDRN) {
2257 write_reg(info, CMD, TXRESET);
2258 write_reg(info, CMD, TXENABLE);
2259 } else
2260 write_reg(info, CMD, TXBUFCLR);
2261
2262 /* disable and clear tx interrupts */
2263 info->ie0_value &= ~TXRDYE;
2264 info->ie1_value &= ~(IDLE + UDRN);
2265 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2266 write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2267
2268 if ( info->tx_active ) {
2269 if (info->params.mode != MGSL_MODE_ASYNC) {
2270 if (status & UDRN)
2271 info->icount.txunder++;
2272 else if (status & IDLE)
2273 info->icount.txok++;
2274 }
2275
2276 info->tx_active = false;
2277 info->tx_count = info->tx_put = info->tx_get = 0;
2278
2279 del_timer(&info->tx_timer);
2280
2281 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2282 info->serial_signals &= ~SerialSignal_RTS;
2283 info->drop_rts_on_tx_done = false;
2284 set_signals(info);
2285 }
2286
2287 #if SYNCLINK_GENERIC_HDLC
2288 if (info->netcount)
2289 hdlcdev_tx_done(info);
2290 else
2291 #endif
2292 {
2293 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2294 tx_stop(info);
2295 return;
2296 }
2297 info->pending_bh |= BH_TRANSMIT;
2298 }
2299 }
2300 }
2301
2302
2303 /*
2304 * handle tx status interrupts
2305 */
2306 static void isr_txint(SLMP_INFO * info)
2307 {
2308 unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2309
2310 /* clear status bits */
2311 write_reg(info, SR1, status);
2312
2313 if ( debug_level >= DEBUG_LEVEL_ISR )
2314 printk("%s(%d):%s isr_txint status=%02x\n",
2315 __FILE__,__LINE__,info->device_name,status);
2316
2317 if (status & (UDRN + IDLE))
2318 isr_txeom(info, status);
2319
2320 if (status & CCTS) {
2321 /* simulate a common modem status change interrupt
2322 * for our handler
2323 */
2324 get_signals( info );
2325 isr_io_pin(info,
2326 MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2327
2328 }
2329 }
2330
2331 /*
2332 * handle async tx data interrupts
2333 */
2334 static void isr_txrdy(SLMP_INFO * info)
2335 {
2336 if ( debug_level >= DEBUG_LEVEL_ISR )
2337 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2338 __FILE__,__LINE__,info->device_name,info->tx_count);
2339
2340 if (info->params.mode != MGSL_MODE_ASYNC) {
2341 /* disable TXRDY IRQ, enable IDLE IRQ */
2342 info->ie0_value &= ~TXRDYE;
2343 info->ie1_value |= IDLE;
2344 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2345 return;
2346 }
2347
2348 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2349 tx_stop(info);
2350 return;
2351 }
2352
2353 if ( info->tx_count )
2354 tx_load_fifo( info );
2355 else {
2356 info->tx_active = false;
2357 info->ie0_value &= ~TXRDYE;
2358 write_reg(info, IE0, info->ie0_value);
2359 }
2360
2361 if (info->tx_count < WAKEUP_CHARS)
2362 info->pending_bh |= BH_TRANSMIT;
2363 }
2364
2365 static void isr_rxdmaok(SLMP_INFO * info)
2366 {
2367 /* BIT7 = EOT (end of transfer)
2368 * BIT6 = EOM (end of message/frame)
2369 */
2370 unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2371
2372 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2373 write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2374
2375 if ( debug_level >= DEBUG_LEVEL_ISR )
2376 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2377 __FILE__,__LINE__,info->device_name,status);
2378
2379 info->pending_bh |= BH_RECEIVE;
2380 }
2381
2382 static void isr_rxdmaerror(SLMP_INFO * info)
2383 {
2384 /* BIT5 = BOF (buffer overflow)
2385 * BIT4 = COF (counter overflow)
2386 */
2387 unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2388
2389 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2390 write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2391
2392 if ( debug_level >= DEBUG_LEVEL_ISR )
2393 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2394 __FILE__,__LINE__,info->device_name,status);
2395
2396 info->rx_overflow = true;
2397 info->pending_bh |= BH_RECEIVE;
2398 }
2399
2400 static void isr_txdmaok(SLMP_INFO * info)
2401 {
2402 unsigned char status_reg1 = read_reg(info, SR1);
2403
2404 write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2405 write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2406 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2407
2408 if ( debug_level >= DEBUG_LEVEL_ISR )
2409 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2410 __FILE__,__LINE__,info->device_name,status_reg1);
2411
2412 /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2413 write_reg16(info, TRC0, 0);
2414 info->ie0_value |= TXRDYE;
2415 write_reg(info, IE0, info->ie0_value);
2416 }
2417
2418 static void isr_txdmaerror(SLMP_INFO * info)
2419 {
2420 /* BIT5 = BOF (buffer overflow)
2421 * BIT4 = COF (counter overflow)
2422 */
2423 unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2424
2425 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2426 write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2427
2428 if ( debug_level >= DEBUG_LEVEL_ISR )
2429 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2430 __FILE__,__LINE__,info->device_name,status);
2431 }
2432
2433 /* handle input serial signal changes
2434 */
2435 static void isr_io_pin( SLMP_INFO *info, u16 status )
2436 {
2437 struct mgsl_icount *icount;
2438
2439 if ( debug_level >= DEBUG_LEVEL_ISR )
2440 printk("%s(%d):isr_io_pin status=%04X\n",
2441 __FILE__,__LINE__,status);
2442
2443 if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2444 MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2445 icount = &info->icount;
2446 /* update input line counters */
2447 if (status & MISCSTATUS_RI_LATCHED) {
2448 icount->rng++;
2449 if ( status & SerialSignal_RI )
2450 info->input_signal_events.ri_up++;
2451 else
2452 info->input_signal_events.ri_down++;
2453 }
2454 if (status & MISCSTATUS_DSR_LATCHED) {
2455 icount->dsr++;
2456 if ( status & SerialSignal_DSR )
2457 info->input_signal_events.dsr_up++;
2458 else
2459 info->input_signal_events.dsr_down++;
2460 }
2461 if (status & MISCSTATUS_DCD_LATCHED) {
2462 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2463 info->ie1_value &= ~CDCD;
2464 write_reg(info, IE1, info->ie1_value);
2465 }
2466 icount->dcd++;
2467 if (status & SerialSignal_DCD) {
2468 info->input_signal_events.dcd_up++;
2469 } else
2470 info->input_signal_events.dcd_down++;
2471 #if SYNCLINK_GENERIC_HDLC
2472 if (info->netcount) {
2473 if (status & SerialSignal_DCD)
2474 netif_carrier_on(info->netdev);
2475 else
2476 netif_carrier_off(info->netdev);
2477 }
2478 #endif
2479 }
2480 if (status & MISCSTATUS_CTS_LATCHED)
2481 {
2482 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2483 info->ie1_value &= ~CCTS;
2484 write_reg(info, IE1, info->ie1_value);
2485 }
2486 icount->cts++;
2487 if ( status & SerialSignal_CTS )
2488 info->input_signal_events.cts_up++;
2489 else
2490 info->input_signal_events.cts_down++;
2491 }
2492 wake_up_interruptible(&info->status_event_wait_q);
2493 wake_up_interruptible(&info->event_wait_q);
2494
2495 if ( (info->port.flags & ASYNC_CHECK_CD) &&
2496 (status & MISCSTATUS_DCD_LATCHED) ) {
2497 if ( debug_level >= DEBUG_LEVEL_ISR )
2498 printk("%s CD now %s...", info->device_name,
2499 (status & SerialSignal_DCD) ? "on" : "off");
2500 if (status & SerialSignal_DCD)
2501 wake_up_interruptible(&info->port.open_wait);
2502 else {
2503 if ( debug_level >= DEBUG_LEVEL_ISR )
2504 printk("doing serial hangup...");
2505 if (info->port.tty)
2506 tty_hangup(info->port.tty);
2507 }
2508 }
2509
2510 if ( (info->port.flags & ASYNC_CTS_FLOW) &&
2511 (status & MISCSTATUS_CTS_LATCHED) ) {
2512 if ( info->port.tty ) {
2513 if (info->port.tty->hw_stopped) {
2514 if (status & SerialSignal_CTS) {
2515 if ( debug_level >= DEBUG_LEVEL_ISR )
2516 printk("CTS tx start...");
2517 info->port.tty->hw_stopped = 0;
2518 tx_start(info);
2519 info->pending_bh |= BH_TRANSMIT;
2520 return;
2521 }
2522 } else {
2523 if (!(status & SerialSignal_CTS)) {
2524 if ( debug_level >= DEBUG_LEVEL_ISR )
2525 printk("CTS tx stop...");
2526 info->port.tty->hw_stopped = 1;
2527 tx_stop(info);
2528 }
2529 }
2530 }
2531 }
2532 }
2533
2534 info->pending_bh |= BH_STATUS;
2535 }
2536
2537 /* Interrupt service routine entry point.
2538 *
2539 * Arguments:
2540 * irq interrupt number that caused interrupt
2541 * dev_id device ID supplied during interrupt registration
2542 * regs interrupted processor context
2543 */
2544 static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
2545 {
2546 SLMP_INFO *info = dev_id;
2547 unsigned char status, status0, status1=0;
2548 unsigned char dmastatus, dmastatus0, dmastatus1=0;
2549 unsigned char timerstatus0, timerstatus1=0;
2550 unsigned char shift;
2551 unsigned int i;
2552 unsigned short tmp;
2553
2554 if ( debug_level >= DEBUG_LEVEL_ISR )
2555 printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
2556 __FILE__, __LINE__, info->irq_level);
2557
2558 spin_lock(&info->lock);
2559
2560 for(;;) {
2561
2562 /* get status for SCA0 (ports 0-1) */
2563 tmp = read_reg16(info, ISR0); /* get ISR0 and ISR1 in one read */
2564 status0 = (unsigned char)tmp;
2565 dmastatus0 = (unsigned char)(tmp>>8);
2566 timerstatus0 = read_reg(info, ISR2);
2567
2568 if ( debug_level >= DEBUG_LEVEL_ISR )
2569 printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2570 __FILE__, __LINE__, info->device_name,
2571 status0, dmastatus0, timerstatus0);
2572
2573 if (info->port_count == 4) {
2574 /* get status for SCA1 (ports 2-3) */
2575 tmp = read_reg16(info->port_array[2], ISR0);
2576 status1 = (unsigned char)tmp;
2577 dmastatus1 = (unsigned char)(tmp>>8);
2578 timerstatus1 = read_reg(info->port_array[2], ISR2);
2579
2580 if ( debug_level >= DEBUG_LEVEL_ISR )
2581 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2582 __FILE__,__LINE__,info->device_name,
2583 status1,dmastatus1,timerstatus1);
2584 }
2585
2586 if (!status0 && !dmastatus0 && !timerstatus0 &&
2587 !status1 && !dmastatus1 && !timerstatus1)
2588 break;
2589
2590 for(i=0; i < info->port_count ; i++) {
2591 if (info->port_array[i] == NULL)
2592 continue;
2593 if (i < 2) {
2594 status = status0;
2595 dmastatus = dmastatus0;
2596 } else {
2597 status = status1;
2598 dmastatus = dmastatus1;
2599 }
2600
2601 shift = i & 1 ? 4 :0;
2602
2603 if (status & BIT0 << shift)
2604 isr_rxrdy(info->port_array[i]);
2605 if (status & BIT1 << shift)
2606 isr_txrdy(info->port_array[i]);
2607 if (status & BIT2 << shift)
2608 isr_rxint(info->port_array[i]);
2609 if (status & BIT3 << shift)
2610 isr_txint(info->port_array[i]);
2611
2612 if (dmastatus & BIT0 << shift)
2613 isr_rxdmaerror(info->port_array[i]);
2614 if (dmastatus & BIT1 << shift)
2615 isr_rxdmaok(info->port_array[i]);
2616 if (dmastatus & BIT2 << shift)
2617 isr_txdmaerror(info->port_array[i]);
2618 if (dmastatus & BIT3 << shift)
2619 isr_txdmaok(info->port_array[i]);
2620 }
2621
2622 if (timerstatus0 & (BIT5 | BIT4))
2623 isr_timer(info->port_array[0]);
2624 if (timerstatus0 & (BIT7 | BIT6))
2625 isr_timer(info->port_array[1]);
2626 if (timerstatus1 & (BIT5 | BIT4))
2627 isr_timer(info->port_array[2]);
2628 if (timerstatus1 & (BIT7 | BIT6))
2629 isr_timer(info->port_array[3]);
2630 }
2631
2632 for(i=0; i < info->port_count ; i++) {
2633 SLMP_INFO * port = info->port_array[i];
2634
2635 /* Request bottom half processing if there's something
2636 * for it to do and the bh is not already running.
2637 *
2638 * Note: startup adapter diags require interrupts.
2639 * do not request bottom half processing if the
2640 * device is not open in a normal mode.
2641 */
2642 if ( port && (port->port.count || port->netcount) &&
2643 port->pending_bh && !port->bh_running &&
2644 !port->bh_requested ) {
2645 if ( debug_level >= DEBUG_LEVEL_ISR )
2646 printk("%s(%d):%s queueing bh task.\n",
2647 __FILE__,__LINE__,port->device_name);
2648 schedule_work(&port->task);
2649 port->bh_requested = true;
2650 }
2651 }
2652
2653 spin_unlock(&info->lock);
2654
2655 if ( debug_level >= DEBUG_LEVEL_ISR )
2656 printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
2657 __FILE__, __LINE__, info->irq_level);
2658 return IRQ_HANDLED;
2659 }
2660
2661 /* Initialize and start device.
2662 */
2663 static int startup(SLMP_INFO * info)
2664 {
2665 if ( debug_level >= DEBUG_LEVEL_INFO )
2666 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2667
2668 if (info->port.flags & ASYNC_INITIALIZED)
2669 return 0;
2670
2671 if (!info->tx_buf) {
2672 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2673 if (!info->tx_buf) {
2674 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2675 __FILE__,__LINE__,info->device_name);
2676 return -ENOMEM;
2677 }
2678 }
2679
2680 info->pending_bh = 0;
2681
2682 memset(&info->icount, 0, sizeof(info->icount));
2683
2684 /* program hardware for current parameters */
2685 reset_port(info);
2686
2687 change_params(info);
2688
2689 mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
2690
2691 if (info->port.tty)
2692 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2693
2694 info->port.flags |= ASYNC_INITIALIZED;
2695
2696 return 0;
2697 }
2698
2699 /* Called by close() and hangup() to shutdown hardware
2700 */
2701 static void shutdown(SLMP_INFO * info)
2702 {
2703 unsigned long flags;
2704
2705 if (!(info->port.flags & ASYNC_INITIALIZED))
2706 return;
2707
2708 if (debug_level >= DEBUG_LEVEL_INFO)
2709 printk("%s(%d):%s synclinkmp_shutdown()\n",
2710 __FILE__,__LINE__, info->device_name );
2711
2712 /* clear status wait queue because status changes */
2713 /* can't happen after shutting down the hardware */
2714 wake_up_interruptible(&info->status_event_wait_q);
2715 wake_up_interruptible(&info->event_wait_q);
2716
2717 del_timer(&info->tx_timer);
2718 del_timer(&info->status_timer);
2719
2720 kfree(info->tx_buf);
2721 info->tx_buf = NULL;
2722
2723 spin_lock_irqsave(&info->lock,flags);
2724
2725 reset_port(info);
2726
2727 if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
2728 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2729 set_signals(info);
2730 }
2731
2732 spin_unlock_irqrestore(&info->lock,flags);
2733
2734 if (info->port.tty)
2735 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2736
2737 info->port.flags &= ~ASYNC_INITIALIZED;
2738 }
2739
2740 static void program_hw(SLMP_INFO *info)
2741 {
2742 unsigned long flags;
2743
2744 spin_lock_irqsave(&info->lock,flags);
2745
2746 rx_stop(info);
2747 tx_stop(info);
2748
2749 info->tx_count = info->tx_put = info->tx_get = 0;
2750
2751 if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2752 hdlc_mode(info);
2753 else
2754 async_mode(info);
2755
2756 set_signals(info);
2757
2758 info->dcd_chkcount = 0;
2759 info->cts_chkcount = 0;
2760 info->ri_chkcount = 0;
2761 info->dsr_chkcount = 0;
2762
2763 info->ie1_value |= (CDCD|CCTS);
2764 write_reg(info, IE1, info->ie1_value);
2765
2766 get_signals(info);
2767
2768 if (info->netcount || (info->port.tty && info->port.tty->termios->c_cflag & CREAD) )
2769 rx_start(info);
2770
2771 spin_unlock_irqrestore(&info->lock,flags);
2772 }
2773
2774 /* Reconfigure adapter based on new parameters
2775 */
2776 static void change_params(SLMP_INFO *info)
2777 {
2778 unsigned cflag;
2779 int bits_per_char;
2780
2781 if (!info->port.tty || !info->port.tty->termios)
2782 return;
2783
2784 if (debug_level >= DEBUG_LEVEL_INFO)
2785 printk("%s(%d):%s change_params()\n",
2786 __FILE__,__LINE__, info->device_name );
2787
2788 cflag = info->port.tty->termios->c_cflag;
2789
2790 /* if B0 rate (hangup) specified then negate DTR and RTS */
2791 /* otherwise assert DTR and RTS */
2792 if (cflag & CBAUD)
2793 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2794 else
2795 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2796
2797 /* byte size and parity */
2798
2799 switch (cflag & CSIZE) {
2800 case CS5: info->params.data_bits = 5; break;
2801 case CS6: info->params.data_bits = 6; break;
2802 case CS7: info->params.data_bits = 7; break;
2803 case CS8: info->params.data_bits = 8; break;
2804 /* Never happens, but GCC is too dumb to figure it out */
2805 default: info->params.data_bits = 7; break;
2806 }
2807
2808 if (cflag & CSTOPB)
2809 info->params.stop_bits = 2;
2810 else
2811 info->params.stop_bits = 1;
2812
2813 info->params.parity = ASYNC_PARITY_NONE;
2814 if (cflag & PARENB) {
2815 if (cflag & PARODD)
2816 info->params.parity = ASYNC_PARITY_ODD;
2817 else
2818 info->params.parity = ASYNC_PARITY_EVEN;
2819 #ifdef CMSPAR
2820 if (cflag & CMSPAR)
2821 info->params.parity = ASYNC_PARITY_SPACE;
2822 #endif
2823 }
2824
2825 /* calculate number of jiffies to transmit a full
2826 * FIFO (32 bytes) at specified data rate
2827 */
2828 bits_per_char = info->params.data_bits +
2829 info->params.stop_bits + 1;
2830
2831 /* if port data rate is set to 460800 or less then
2832 * allow tty settings to override, otherwise keep the
2833 * current data rate.
2834 */
2835 if (info->params.data_rate <= 460800) {
2836 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2837 }
2838
2839 if ( info->params.data_rate ) {
2840 info->timeout = (32*HZ*bits_per_char) /
2841 info->params.data_rate;
2842 }
2843 info->timeout += HZ/50; /* Add .02 seconds of slop */
2844
2845 if (cflag & CRTSCTS)
2846 info->port.flags |= ASYNC_CTS_FLOW;
2847 else
2848 info->port.flags &= ~ASYNC_CTS_FLOW;
2849
2850 if (cflag & CLOCAL)
2851 info->port.flags &= ~ASYNC_CHECK_CD;
2852 else
2853 info->port.flags |= ASYNC_CHECK_CD;
2854
2855 /* process tty input control flags */
2856
2857 info->read_status_mask2 = OVRN;
2858 if (I_INPCK(info->port.tty))
2859 info->read_status_mask2 |= PE | FRME;
2860 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2861 info->read_status_mask1 |= BRKD;
2862 if (I_IGNPAR(info->port.tty))
2863 info->ignore_status_mask2 |= PE | FRME;
2864 if (I_IGNBRK(info->port.tty)) {
2865 info->ignore_status_mask1 |= BRKD;
2866 /* If ignoring parity and break indicators, ignore
2867 * overruns too. (For real raw support).
2868 */
2869 if (I_IGNPAR(info->port.tty))
2870 info->ignore_status_mask2 |= OVRN;
2871 }
2872
2873 program_hw(info);
2874 }
2875
2876 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2877 {
2878 int err;
2879
2880 if (debug_level >= DEBUG_LEVEL_INFO)
2881 printk("%s(%d):%s get_params()\n",
2882 __FILE__,__LINE__, info->device_name);
2883
2884 if (!user_icount) {
2885 memset(&info->icount, 0, sizeof(info->icount));
2886 } else {
2887 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2888 if (err)
2889 return -EFAULT;
2890 }
2891
2892 return 0;
2893 }
2894
2895 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2896 {
2897 int err;
2898 if (debug_level >= DEBUG_LEVEL_INFO)
2899 printk("%s(%d):%s get_params()\n",
2900 __FILE__,__LINE__, info->device_name);
2901
2902 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2903 if (err) {
2904 if ( debug_level >= DEBUG_LEVEL_INFO )
2905 printk( "%s(%d):%s get_params() user buffer copy failed\n",
2906 __FILE__,__LINE__,info->device_name);
2907 return -EFAULT;
2908 }
2909
2910 return 0;
2911 }
2912
2913 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2914 {
2915 unsigned long flags;
2916 MGSL_PARAMS tmp_params;
2917 int err;
2918
2919 if (debug_level >= DEBUG_LEVEL_INFO)
2920 printk("%s(%d):%s set_params\n",
2921 __FILE__,__LINE__,info->device_name );
2922 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2923 if (err) {
2924 if ( debug_level >= DEBUG_LEVEL_INFO )
2925 printk( "%s(%d):%s set_params() user buffer copy failed\n",
2926 __FILE__,__LINE__,info->device_name);
2927 return -EFAULT;
2928 }
2929
2930 spin_lock_irqsave(&info->lock,flags);
2931 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2932 spin_unlock_irqrestore(&info->lock,flags);
2933
2934 change_params(info);
2935
2936 return 0;
2937 }
2938
2939 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
2940 {
2941 int err;
2942
2943 if (debug_level >= DEBUG_LEVEL_INFO)
2944 printk("%s(%d):%s get_txidle()=%d\n",
2945 __FILE__,__LINE__, info->device_name, info->idle_mode);
2946
2947 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2948 if (err) {
2949 if ( debug_level >= DEBUG_LEVEL_INFO )
2950 printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
2951 __FILE__,__LINE__,info->device_name);
2952 return -EFAULT;
2953 }
2954
2955 return 0;
2956 }
2957
2958 static int set_txidle(SLMP_INFO * info, int idle_mode)
2959 {
2960 unsigned long flags;
2961
2962 if (debug_level >= DEBUG_LEVEL_INFO)
2963 printk("%s(%d):%s set_txidle(%d)\n",
2964 __FILE__,__LINE__,info->device_name, idle_mode );
2965
2966 spin_lock_irqsave(&info->lock,flags);
2967 info->idle_mode = idle_mode;
2968 tx_set_idle( info );
2969 spin_unlock_irqrestore(&info->lock,flags);
2970 return 0;
2971 }
2972
2973 static int tx_enable(SLMP_INFO * info, int enable)
2974 {
2975 unsigned long flags;
2976
2977 if (debug_level >= DEBUG_LEVEL_INFO)
2978 printk("%s(%d):%s tx_enable(%d)\n",
2979 __FILE__,__LINE__,info->device_name, enable);
2980
2981 spin_lock_irqsave(&info->lock,flags);
2982 if ( enable ) {
2983 if ( !info->tx_enabled ) {
2984 tx_start(info);
2985 }
2986 } else {
2987 if ( info->tx_enabled )
2988 tx_stop(info);
2989 }
2990 spin_unlock_irqrestore(&info->lock,flags);
2991 return 0;
2992 }
2993
2994 /* abort send HDLC frame
2995 */
2996 static int tx_abort(SLMP_INFO * info)
2997 {
2998 unsigned long flags;
2999
3000 if (debug_level >= DEBUG_LEVEL_INFO)
3001 printk("%s(%d):%s tx_abort()\n",
3002 __FILE__,__LINE__,info->device_name);
3003
3004 spin_lock_irqsave(&info->lock,flags);
3005 if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
3006 info->ie1_value &= ~UDRN;
3007 info->ie1_value |= IDLE;
3008 write_reg(info, IE1, info->ie1_value); /* disable tx status interrupts */
3009 write_reg(info, SR1, (unsigned char)(IDLE + UDRN)); /* clear pending */
3010
3011 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
3012 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
3013
3014 write_reg(info, CMD, TXABORT);
3015 }
3016 spin_unlock_irqrestore(&info->lock,flags);
3017 return 0;
3018 }
3019
3020 static int rx_enable(SLMP_INFO * info, int enable)
3021 {
3022 unsigned long flags;
3023
3024 if (debug_level >= DEBUG_LEVEL_INFO)
3025 printk("%s(%d):%s rx_enable(%d)\n",
3026 __FILE__,__LINE__,info->device_name,enable);
3027
3028 spin_lock_irqsave(&info->lock,flags);
3029 if ( enable ) {
3030 if ( !info->rx_enabled )
3031 rx_start(info);
3032 } else {
3033 if ( info->rx_enabled )
3034 rx_stop(info);
3035 }
3036 spin_unlock_irqrestore(&info->lock,flags);
3037 return 0;
3038 }
3039
3040 /* wait for specified event to occur
3041 */
3042 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3043 {
3044 unsigned long flags;
3045 int s;
3046 int rc=0;
3047 struct mgsl_icount cprev, cnow;
3048 int events;
3049 int mask;
3050 struct _input_signal_events oldsigs, newsigs;
3051 DECLARE_WAITQUEUE(wait, current);
3052
3053 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3054 if (rc) {
3055 return -EFAULT;
3056 }
3057
3058 if (debug_level >= DEBUG_LEVEL_INFO)
3059 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3060 __FILE__,__LINE__,info->device_name,mask);
3061
3062 spin_lock_irqsave(&info->lock,flags);
3063
3064 /* return immediately if state matches requested events */
3065 get_signals(info);
3066 s = info->serial_signals;
3067
3068 events = mask &
3069 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3070 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3071 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3072 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3073 if (events) {
3074 spin_unlock_irqrestore(&info->lock,flags);
3075 goto exit;
3076 }
3077
3078 /* save current irq counts */
3079 cprev = info->icount;
3080 oldsigs = info->input_signal_events;
3081
3082 /* enable hunt and idle irqs if needed */
3083 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3084 unsigned char oldval = info->ie1_value;
3085 unsigned char newval = oldval +
3086 (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3087 (mask & MgslEvent_IdleReceived ? IDLD:0);
3088 if ( oldval != newval ) {
3089 info->ie1_value = newval;
3090 write_reg(info, IE1, info->ie1_value);
3091 }
3092 }
3093
3094 set_current_state(TASK_INTERRUPTIBLE);
3095 add_wait_queue(&info->event_wait_q, &wait);
3096
3097 spin_unlock_irqrestore(&info->lock,flags);
3098
3099 for(;;) {
3100 schedule();
3101 if (signal_pending(current)) {
3102 rc = -ERESTARTSYS;
3103 break;
3104 }
3105
3106 /* get current irq counts */
3107 spin_lock_irqsave(&info->lock,flags);
3108 cnow = info->icount;
3109 newsigs = info->input_signal_events;
3110 set_current_state(TASK_INTERRUPTIBLE);
3111 spin_unlock_irqrestore(&info->lock,flags);
3112
3113 /* if no change, wait aborted for some reason */
3114 if (newsigs.dsr_up == oldsigs.dsr_up &&
3115 newsigs.dsr_down == oldsigs.dsr_down &&
3116 newsigs.dcd_up == oldsigs.dcd_up &&
3117 newsigs.dcd_down == oldsigs.dcd_down &&
3118 newsigs.cts_up == oldsigs.cts_up &&
3119 newsigs.cts_down == oldsigs.cts_down &&
3120 newsigs.ri_up == oldsigs.ri_up &&
3121 newsigs.ri_down == oldsigs.ri_down &&
3122 cnow.exithunt == cprev.exithunt &&
3123 cnow.rxidle == cprev.rxidle) {
3124 rc = -EIO;
3125 break;
3126 }
3127
3128 events = mask &
3129 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
3130 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3131 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
3132 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3133 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
3134 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3135 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
3136 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
3137 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
3138 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
3139 if (events)
3140 break;
3141
3142 cprev = cnow;
3143 oldsigs = newsigs;
3144 }
3145
3146 remove_wait_queue(&info->event_wait_q, &wait);
3147 set_current_state(TASK_RUNNING);
3148
3149
3150 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3151 spin_lock_irqsave(&info->lock,flags);
3152 if (!waitqueue_active(&info->event_wait_q)) {
3153 /* disable enable exit hunt mode/idle rcvd IRQs */
3154 info->ie1_value &= ~(FLGD|IDLD);
3155 write_reg(info, IE1, info->ie1_value);
3156 }
3157 spin_unlock_irqrestore(&info->lock,flags);
3158 }
3159 exit:
3160 if ( rc == 0 )
3161 PUT_USER(rc, events, mask_ptr);
3162
3163 return rc;
3164 }
3165
3166 static int modem_input_wait(SLMP_INFO *info,int arg)
3167 {
3168 unsigned long flags;
3169 int rc;
3170 struct mgsl_icount cprev, cnow;
3171 DECLARE_WAITQUEUE(wait, current);
3172
3173 /* save current irq counts */
3174 spin_lock_irqsave(&info->lock,flags);
3175 cprev = info->icount;
3176 add_wait_queue(&info->status_event_wait_q, &wait);
3177 set_current_state(TASK_INTERRUPTIBLE);
3178 spin_unlock_irqrestore(&info->lock,flags);
3179
3180 for(;;) {
3181 schedule();
3182 if (signal_pending(current)) {
3183 rc = -ERESTARTSYS;
3184 break;
3185 }
3186
3187 /* get new irq counts */
3188 spin_lock_irqsave(&info->lock,flags);
3189 cnow = info->icount;
3190 set_current_state(TASK_INTERRUPTIBLE);
3191 spin_unlock_irqrestore(&info->lock,flags);
3192
3193 /* if no change, wait aborted for some reason */
3194 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3195 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3196 rc = -EIO;
3197 break;
3198 }
3199
3200 /* check for change in caller specified modem input */
3201 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3202 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3203 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3204 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3205 rc = 0;
3206 break;
3207 }
3208
3209 cprev = cnow;
3210 }
3211 remove_wait_queue(&info->status_event_wait_q, &wait);
3212 set_current_state(TASK_RUNNING);
3213 return rc;
3214 }
3215
3216 /* return the state of the serial control and status signals
3217 */
3218 static int tiocmget(struct tty_struct *tty, struct file *file)
3219 {
3220 SLMP_INFO *info = tty->driver_data;
3221 unsigned int result;
3222 unsigned long flags;
3223
3224 spin_lock_irqsave(&info->lock,flags);
3225 get_signals(info);
3226 spin_unlock_irqrestore(&info->lock,flags);
3227
3228 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3229 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3230 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3231 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
3232 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3233 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3234
3235 if (debug_level >= DEBUG_LEVEL_INFO)
3236 printk("%s(%d):%s tiocmget() value=%08X\n",
3237 __FILE__,__LINE__, info->device_name, result );
3238 return result;
3239 }
3240
3241 /* set modem control signals (DTR/RTS)
3242 */
3243 static int tiocmset(struct tty_struct *tty, struct file *file,
3244 unsigned int set, unsigned int clear)
3245 {
3246 SLMP_INFO *info = tty->driver_data;
3247 unsigned long flags;
3248
3249 if (debug_level >= DEBUG_LEVEL_INFO)
3250 printk("%s(%d):%s tiocmset(%x,%x)\n",
3251 __FILE__,__LINE__,info->device_name, set, clear);
3252
3253 if (set & TIOCM_RTS)
3254 info->serial_signals |= SerialSignal_RTS;
3255 if (set & TIOCM_DTR)
3256 info->serial_signals |= SerialSignal_DTR;
3257 if (clear & TIOCM_RTS)
3258 info->serial_signals &= ~SerialSignal_RTS;
3259 if (clear & TIOCM_DTR)
3260 info->serial_signals &= ~SerialSignal_DTR;
3261
3262 spin_lock_irqsave(&info->lock,flags);
3263 set_signals(info);
3264 spin_unlock_irqrestore(&info->lock,flags);
3265
3266 return 0;
3267 }
3268
3269 static int carrier_raised(struct tty_port *port)
3270 {
3271 SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3272 unsigned long flags;
3273
3274 spin_lock_irqsave(&info->lock,flags);
3275 get_signals(info);
3276 spin_unlock_irqrestore(&info->lock,flags);
3277
3278 return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
3279 }
3280
3281 static void dtr_rts(struct tty_port *port, int on)
3282 {
3283 SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3284 unsigned long flags;
3285
3286 spin_lock_irqsave(&info->lock,flags);
3287 if (on)
3288 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3289 else
3290 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3291 set_signals(info);
3292 spin_unlock_irqrestore(&info->lock,flags);
3293 }
3294
3295 /* Block the current process until the specified port is ready to open.
3296 */
3297 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3298 SLMP_INFO *info)
3299 {
3300 DECLARE_WAITQUEUE(wait, current);
3301 int retval;
3302 bool do_clocal = false;
3303 bool extra_count = false;
3304 unsigned long flags;
3305 int cd;
3306 struct tty_port *port = &info->port;
3307
3308 if (debug_level >= DEBUG_LEVEL_INFO)
3309 printk("%s(%d):%s block_til_ready()\n",
3310 __FILE__,__LINE__, tty->driver->name );
3311
3312 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3313 /* nonblock mode is set or port is not enabled */
3314 /* just verify that callout device is not active */
3315 port->flags |= ASYNC_NORMAL_ACTIVE;
3316 return 0;
3317 }
3318
3319 if (tty->termios->c_cflag & CLOCAL)
3320 do_clocal = true;
3321
3322 /* Wait for carrier detect and the line to become
3323 * free (i.e., not in use by the callout). While we are in
3324 * this loop, port->count is dropped by one, so that
3325 * close() knows when to free things. We restore it upon
3326 * exit, either normal or abnormal.
3327 */
3328
3329 retval = 0;
3330 add_wait_queue(&port->open_wait, &wait);
3331
3332 if (debug_level >= DEBUG_LEVEL_INFO)
3333 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3334 __FILE__,__LINE__, tty->driver->name, port->count );
3335
3336 spin_lock_irqsave(&info->lock, flags);
3337 if (!tty_hung_up_p(filp)) {
3338 extra_count = true;
3339 port->count--;
3340 }
3341 spin_unlock_irqrestore(&info->lock, flags);
3342 port->blocked_open++;
3343
3344 while (1) {
3345 if (tty->termios->c_cflag & CBAUD)
3346 tty_port_raise_dtr_rts(port);
3347
3348 set_current_state(TASK_INTERRUPTIBLE);
3349
3350 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3351 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3352 -EAGAIN : -ERESTARTSYS;
3353 break;
3354 }
3355
3356 cd = tty_port_carrier_raised(port);
3357
3358 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd))
3359 break;
3360
3361 if (signal_pending(current)) {
3362 retval = -ERESTARTSYS;
3363 break;
3364 }
3365
3366 if (debug_level >= DEBUG_LEVEL_INFO)
3367 printk("%s(%d):%s block_til_ready() count=%d\n",
3368 __FILE__,__LINE__, tty->driver->name, port->count );
3369
3370 schedule();
3371 }
3372
3373 set_current_state(TASK_RUNNING);
3374 remove_wait_queue(&port->open_wait, &wait);
3375
3376 if (extra_count)
3377 port->count++;
3378 port->blocked_open--;
3379
3380 if (debug_level >= DEBUG_LEVEL_INFO)
3381 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3382 __FILE__,__LINE__, tty->driver->name, port->count );
3383
3384 if (!retval)
3385 port->flags |= ASYNC_NORMAL_ACTIVE;
3386
3387 return retval;
3388 }
3389
3390 static int alloc_dma_bufs(SLMP_INFO *info)
3391 {
3392 unsigned short BuffersPerFrame;
3393 unsigned short BufferCount;
3394
3395 // Force allocation to start at 64K boundary for each port.
3396 // This is necessary because *all* buffer descriptors for a port
3397 // *must* be in the same 64K block. All descriptors on a port
3398 // share a common 'base' address (upper 8 bits of 24 bits) programmed
3399 // into the CBP register.
3400 info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3401
3402 /* Calculate the number of DMA buffers necessary to hold the */
3403 /* largest allowable frame size. Note: If the max frame size is */
3404 /* not an even multiple of the DMA buffer size then we need to */
3405 /* round the buffer count per frame up one. */
3406
3407 BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3408 if ( info->max_frame_size % SCABUFSIZE )
3409 BuffersPerFrame++;
3410
3411 /* calculate total number of data buffers (SCABUFSIZE) possible
3412 * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3413 * for the descriptor list (BUFFERLISTSIZE).
3414 */
3415 BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3416
3417 /* limit number of buffers to maximum amount of descriptors */
3418 if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3419 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3420
3421 /* use enough buffers to transmit one max size frame */
3422 info->tx_buf_count = BuffersPerFrame + 1;
3423
3424 /* never use more than half the available buffers for transmit */
3425 if (info->tx_buf_count > (BufferCount/2))
3426 info->tx_buf_count = BufferCount/2;
3427
3428 if (info->tx_buf_count > SCAMAXDESC)
3429 info->tx_buf_count = SCAMAXDESC;
3430
3431 /* use remaining buffers for receive */
3432 info->rx_buf_count = BufferCount - info->tx_buf_count;
3433
3434 if (info->rx_buf_count > SCAMAXDESC)
3435 info->rx_buf_count = SCAMAXDESC;
3436
3437 if ( debug_level >= DEBUG_LEVEL_INFO )
3438 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3439 __FILE__,__LINE__, info->device_name,
3440 info->tx_buf_count,info->rx_buf_count);
3441
3442 if ( alloc_buf_list( info ) < 0 ||
3443 alloc_frame_bufs(info,
3444 info->rx_buf_list,
3445 info->rx_buf_list_ex,
3446 info->rx_buf_count) < 0 ||
3447 alloc_frame_bufs(info,
3448 info->tx_buf_list,
3449 info->tx_buf_list_ex,
3450 info->tx_buf_count) < 0 ||
3451 alloc_tmp_rx_buf(info) < 0 ) {
3452 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3453 __FILE__,__LINE__, info->device_name);
3454 return -ENOMEM;
3455 }
3456
3457 rx_reset_buffers( info );
3458
3459 return 0;
3460 }
3461
3462 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3463 */
3464 static int alloc_buf_list(SLMP_INFO *info)
3465 {
3466 unsigned int i;
3467
3468 /* build list in adapter shared memory */
3469 info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3470 info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3471 info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3472
3473 memset(info->buffer_list, 0, BUFFERLISTSIZE);
3474
3475 /* Save virtual address pointers to the receive and */
3476 /* transmit buffer lists. (Receive 1st). These pointers will */
3477 /* be used by the processor to access the lists. */
3478 info->rx_buf_list = (SCADESC *)info->buffer_list;
3479
3480 info->tx_buf_list = (SCADESC *)info->buffer_list;
3481 info->tx_buf_list += info->rx_buf_count;
3482
3483 /* Build links for circular buffer entry lists (tx and rx)
3484 *
3485 * Note: links are physical addresses read by the SCA device
3486 * to determine the next buffer entry to use.
3487 */
3488
3489 for ( i = 0; i < info->rx_buf_count; i++ ) {
3490 /* calculate and store physical address of this buffer entry */
3491 info->rx_buf_list_ex[i].phys_entry =
3492 info->buffer_list_phys + (i * sizeof(SCABUFSIZE));
3493
3494 /* calculate and store physical address of */
3495 /* next entry in cirular list of entries */
3496 info->rx_buf_list[i].next = info->buffer_list_phys;
3497 if ( i < info->rx_buf_count - 1 )
3498 info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3499
3500 info->rx_buf_list[i].length = SCABUFSIZE;
3501 }
3502
3503 for ( i = 0; i < info->tx_buf_count; i++ ) {
3504 /* calculate and store physical address of this buffer entry */
3505 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3506 ((info->rx_buf_count + i) * sizeof(SCADESC));
3507
3508 /* calculate and store physical address of */
3509 /* next entry in cirular list of entries */
3510
3511 info->tx_buf_list[i].next = info->buffer_list_phys +
3512 info->rx_buf_count * sizeof(SCADESC);
3513
3514 if ( i < info->tx_buf_count - 1 )
3515 info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3516 }
3517
3518 return 0;
3519 }
3520
3521 /* Allocate the frame DMA buffers used by the specified buffer list.
3522 */
3523 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3524 {
3525 int i;
3526 unsigned long phys_addr;
3527
3528 for ( i = 0; i < count; i++ ) {
3529 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3530 phys_addr = info->port_array[0]->last_mem_alloc;
3531 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3532
3533 buf_list[i].buf_ptr = (unsigned short)phys_addr;
3534 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3535 }
3536
3537 return 0;
3538 }
3539
3540 static void free_dma_bufs(SLMP_INFO *info)
3541 {
3542 info->buffer_list = NULL;
3543 info->rx_buf_list = NULL;
3544 info->tx_buf_list = NULL;
3545 }
3546
3547 /* allocate buffer large enough to hold max_frame_size.
3548 * This buffer is used to pass an assembled frame to the line discipline.
3549 */
3550 static int alloc_tmp_rx_buf(SLMP_INFO *info)
3551 {
3552 info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3553 if (info->tmp_rx_buf == NULL)
3554 return -ENOMEM;
3555 return 0;
3556 }
3557
3558 static void free_tmp_rx_buf(SLMP_INFO *info)
3559 {
3560 kfree(info->tmp_rx_buf);
3561 info->tmp_rx_buf = NULL;
3562 }
3563
3564 static int claim_resources(SLMP_INFO *info)
3565 {
3566 if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3567 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3568 __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3569 info->init_error = DiagStatus_AddressConflict;
3570 goto errout;
3571 }
3572 else
3573 info->shared_mem_requested = true;
3574
3575 if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3576 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3577 __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3578 info->init_error = DiagStatus_AddressConflict;
3579 goto errout;
3580 }
3581 else
3582 info->lcr_mem_requested = true;
3583
3584 if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3585 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3586 __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3587 info->init_error = DiagStatus_AddressConflict;
3588 goto errout;
3589 }
3590 else
3591 info->sca_base_requested = true;
3592
3593 if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3594 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3595 __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3596 info->init_error = DiagStatus_AddressConflict;
3597 goto errout;
3598 }
3599 else
3600 info->sca_statctrl_requested = true;
3601
3602 info->memory_base = ioremap_nocache(info->phys_memory_base,
3603 SCA_MEM_SIZE);
3604 if (!info->memory_base) {
3605 printk( "%s(%d):%s Cant map shared memory, MemAddr=%08X\n",
3606 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3607 info->init_error = DiagStatus_CantAssignPciResources;
3608 goto errout;
3609 }
3610
3611 info->lcr_base = ioremap_nocache(info->phys_lcr_base, PAGE_SIZE);
3612 if (!info->lcr_base) {
3613 printk( "%s(%d):%s Cant map LCR memory, MemAddr=%08X\n",
3614 __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3615 info->init_error = DiagStatus_CantAssignPciResources;
3616 goto errout;
3617 }
3618 info->lcr_base += info->lcr_offset;
3619
3620 info->sca_base = ioremap_nocache(info->phys_sca_base, PAGE_SIZE);
3621 if (!info->sca_base) {
3622 printk( "%s(%d):%s Cant map SCA memory, MemAddr=%08X\n",
3623 __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3624 info->init_error = DiagStatus_CantAssignPciResources;
3625 goto errout;
3626 }
3627 info->sca_base += info->sca_offset;
3628
3629 info->statctrl_base = ioremap_nocache(info->phys_statctrl_base,
3630 PAGE_SIZE);
3631 if (!info->statctrl_base) {
3632 printk( "%s(%d):%s Cant map SCA Status/Control memory, MemAddr=%08X\n",
3633 __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3634 info->init_error = DiagStatus_CantAssignPciResources;
3635 goto errout;
3636 }
3637 info->statctrl_base += info->statctrl_offset;
3638
3639 if ( !memory_test(info) ) {
3640 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3641 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3642 info->init_error = DiagStatus_MemoryError;
3643 goto errout;
3644 }
3645
3646 return 0;
3647
3648 errout:
3649 release_resources( info );
3650 return -ENODEV;
3651 }
3652
3653 static void release_resources(SLMP_INFO *info)
3654 {
3655 if ( debug_level >= DEBUG_LEVEL_INFO )
3656 printk( "%s(%d):%s release_resources() entry\n",
3657 __FILE__,__LINE__,info->device_name );
3658
3659 if ( info->irq_requested ) {
3660 free_irq(info->irq_level, info);
3661 info->irq_requested = false;
3662 }
3663
3664 if ( info->shared_mem_requested ) {
3665 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3666 info->shared_mem_requested = false;
3667 }
3668 if ( info->lcr_mem_requested ) {
3669 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3670 info->lcr_mem_requested = false;
3671 }
3672 if ( info->sca_base_requested ) {
3673 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3674 info->sca_base_requested = false;
3675 }
3676 if ( info->sca_statctrl_requested ) {
3677 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3678 info->sca_statctrl_requested = false;
3679 }
3680
3681 if (info->memory_base){
3682 iounmap(info->memory_base);
3683 info->memory_base = NULL;
3684 }
3685
3686 if (info->sca_base) {
3687 iounmap(info->sca_base - info->sca_offset);
3688 info->sca_base=NULL;
3689 }
3690
3691 if (info->statctrl_base) {
3692 iounmap(info->statctrl_base - info->statctrl_offset);
3693 info->statctrl_base=NULL;
3694 }
3695
3696 if (info->lcr_base){
3697 iounmap(info->lcr_base - info->lcr_offset);
3698 info->lcr_base = NULL;
3699 }
3700
3701 if ( debug_level >= DEBUG_LEVEL_INFO )
3702 printk( "%s(%d):%s release_resources() exit\n",
3703 __FILE__,__LINE__,info->device_name );
3704 }
3705
3706 /* Add the specified device instance data structure to the
3707 * global linked list of devices and increment the device count.
3708 */
3709 static void add_device(SLMP_INFO *info)
3710 {
3711 info->next_device = NULL;
3712 info->line = synclinkmp_device_count;
3713 sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3714
3715 if (info->line < MAX_DEVICES) {
3716 if (maxframe[info->line])
3717 info->max_frame_size = maxframe[info->line];
3718 }
3719
3720 synclinkmp_device_count++;
3721
3722 if ( !synclinkmp_device_list )
3723 synclinkmp_device_list = info;
3724 else {
3725 SLMP_INFO *current_dev = synclinkmp_device_list;
3726 while( current_dev->next_device )
3727 current_dev = current_dev->next_device;
3728 current_dev->next_device = info;
3729 }
3730
3731 if ( info->max_frame_size < 4096 )
3732 info->max_frame_size = 4096;
3733 else if ( info->max_frame_size > 65535 )
3734 info->max_frame_size = 65535;
3735
3736 printk( "SyncLink MultiPort %s: "
3737 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3738 info->device_name,
3739 info->phys_sca_base,
3740 info->phys_memory_base,
3741 info->phys_statctrl_base,
3742 info->phys_lcr_base,
3743 info->irq_level,
3744 info->max_frame_size );
3745
3746 #if SYNCLINK_GENERIC_HDLC
3747 hdlcdev_init(info);
3748 #endif
3749 }
3750
3751 static const struct tty_port_operations port_ops = {
3752 .carrier_raised = carrier_raised,
3753 .dtr_rts = dtr_rts,
3754 };
3755
3756 /* Allocate and initialize a device instance structure
3757 *
3758 * Return Value: pointer to SLMP_INFO if success, otherwise NULL
3759 */
3760 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3761 {
3762 SLMP_INFO *info;
3763
3764 info = kzalloc(sizeof(SLMP_INFO),
3765 GFP_KERNEL);
3766
3767 if (!info) {
3768 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3769 __FILE__,__LINE__, adapter_num, port_num);
3770 } else {
3771 tty_port_init(&info->port);
3772 info->port.ops = &port_ops;
3773 info->magic = MGSL_MAGIC;
3774 INIT_WORK(&info->task, bh_handler);
3775 info->max_frame_size = 4096;
3776 info->port.close_delay = 5*HZ/10;
3777 info->port.closing_wait = 30*HZ;
3778 init_waitqueue_head(&info->status_event_wait_q);
3779 init_waitqueue_head(&info->event_wait_q);
3780 spin_lock_init(&info->netlock);
3781 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3782 info->idle_mode = HDLC_TXIDLE_FLAGS;
3783 info->adapter_num = adapter_num;
3784 info->port_num = port_num;
3785
3786 /* Copy configuration info to device instance data */
3787 info->irq_level = pdev->irq;
3788 info->phys_lcr_base = pci_resource_start(pdev,0);
3789 info->phys_sca_base = pci_resource_start(pdev,2);
3790 info->phys_memory_base = pci_resource_start(pdev,3);
3791 info->phys_statctrl_base = pci_resource_start(pdev,4);
3792
3793 /* Because veremap only works on page boundaries we must map
3794 * a larger area than is actually implemented for the LCR
3795 * memory range. We map a full page starting at the page boundary.
3796 */
3797 info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
3798 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3799
3800 info->sca_offset = info->phys_sca_base & (PAGE_SIZE-1);
3801 info->phys_sca_base &= ~(PAGE_SIZE-1);
3802
3803 info->statctrl_offset = info->phys_statctrl_base & (PAGE_SIZE-1);
3804 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3805
3806 info->bus_type = MGSL_BUS_TYPE_PCI;
3807 info->irq_flags = IRQF_SHARED;
3808
3809 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3810 setup_timer(&info->status_timer, status_timeout,
3811 (unsigned long)info);
3812
3813 /* Store the PCI9050 misc control register value because a flaw
3814 * in the PCI9050 prevents LCR registers from being read if
3815 * BIOS assigns an LCR base address with bit 7 set.
3816 *
3817 * Only the misc control register is accessed for which only
3818 * write access is needed, so set an initial value and change
3819 * bits to the device instance data as we write the value
3820 * to the actual misc control register.
3821 */
3822 info->misc_ctrl_value = 0x087e4546;
3823
3824 /* initial port state is unknown - if startup errors
3825 * occur, init_error will be set to indicate the
3826 * problem. Once the port is fully initialized,
3827 * this value will be set to 0 to indicate the
3828 * port is available.
3829 */
3830 info->init_error = -1;
3831 }
3832
3833 return info;
3834 }
3835
3836 static void device_init(int adapter_num, struct pci_dev *pdev)
3837 {
3838 SLMP_INFO *port_array[SCA_MAX_PORTS];
3839 int port;
3840
3841 /* allocate device instances for up to SCA_MAX_PORTS devices */
3842 for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3843 port_array[port] = alloc_dev(adapter_num,port,pdev);
3844 if( port_array[port] == NULL ) {
3845 for ( --port; port >= 0; --port )
3846 kfree(port_array[port]);
3847 return;
3848 }
3849 }
3850
3851 /* give copy of port_array to all ports and add to device list */
3852 for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3853 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3854 add_device( port_array[port] );
3855 spin_lock_init(&port_array[port]->lock);
3856 }
3857
3858 /* Allocate and claim adapter resources */
3859 if ( !claim_resources(port_array[0]) ) {
3860
3861 alloc_dma_bufs(port_array[0]);
3862
3863 /* copy resource information from first port to others */
3864 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3865 port_array[port]->lock = port_array[0]->lock;
3866 port_array[port]->irq_level = port_array[0]->irq_level;
3867 port_array[port]->memory_base = port_array[0]->memory_base;
3868 port_array[port]->sca_base = port_array[0]->sca_base;
3869 port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3870 port_array[port]->lcr_base = port_array[0]->lcr_base;
3871 alloc_dma_bufs(port_array[port]);
3872 }
3873
3874 if ( request_irq(port_array[0]->irq_level,
3875 synclinkmp_interrupt,
3876 port_array[0]->irq_flags,
3877 port_array[0]->device_name,
3878 port_array[0]) < 0 ) {
3879 printk( "%s(%d):%s Cant request interrupt, IRQ=%d\n",
3880 __FILE__,__LINE__,
3881 port_array[0]->device_name,
3882 port_array[0]->irq_level );
3883 }
3884 else {
3885 port_array[0]->irq_requested = true;
3886 adapter_test(port_array[0]);
3887 }
3888 }
3889 }
3890
3891 static const struct tty_operations ops = {
3892 .open = open,
3893 .close = close,
3894 .write = write,
3895 .put_char = put_char,
3896 .flush_chars = flush_chars,
3897 .write_room = write_room,
3898 .chars_in_buffer = chars_in_buffer,
3899 .flush_buffer = flush_buffer,
3900 .ioctl = ioctl,
3901 .throttle = throttle,
3902 .unthrottle = unthrottle,
3903 .send_xchar = send_xchar,
3904 .break_ctl = set_break,
3905 .wait_until_sent = wait_until_sent,
3906 .set_termios = set_termios,
3907 .stop = tx_hold,
3908 .start = tx_release,
3909 .hangup = hangup,
3910 .tiocmget = tiocmget,
3911 .tiocmset = tiocmset,
3912 .proc_fops = &synclinkmp_proc_fops,
3913 };
3914
3915
3916 static void synclinkmp_cleanup(void)
3917 {
3918 int rc;
3919 SLMP_INFO *info;
3920 SLMP_INFO *tmp;
3921
3922 printk("Unloading %s %s\n", driver_name, driver_version);
3923
3924 if (serial_driver) {
3925 if ((rc = tty_unregister_driver(serial_driver)))
3926 printk("%s(%d) failed to unregister tty driver err=%d\n",
3927 __FILE__,__LINE__,rc);
3928 put_tty_driver(serial_driver);
3929 }
3930
3931 /* reset devices */
3932 info = synclinkmp_device_list;
3933 while(info) {
3934 reset_port(info);
3935 info = info->next_device;
3936 }
3937
3938 /* release devices */
3939 info = synclinkmp_device_list;
3940 while(info) {
3941 #if SYNCLINK_GENERIC_HDLC
3942 hdlcdev_exit(info);
3943 #endif
3944 free_dma_bufs(info);
3945 free_tmp_rx_buf(info);
3946 if ( info->port_num == 0 ) {
3947 if (info->sca_base)
3948 write_reg(info, LPR, 1); /* set low power mode */
3949 release_resources(info);
3950 }
3951 tmp = info;
3952 info = info->next_device;
3953 kfree(tmp);
3954 }
3955
3956 pci_unregister_driver(&synclinkmp_pci_driver);
3957 }
3958
3959 /* Driver initialization entry point.
3960 */
3961
3962 static int __init synclinkmp_init(void)
3963 {
3964 int rc;
3965
3966 if (break_on_load) {
3967 synclinkmp_get_text_ptr();
3968 BREAKPOINT();
3969 }
3970
3971 printk("%s %s\n", driver_name, driver_version);
3972
3973 if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
3974 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
3975 return rc;
3976 }
3977
3978 serial_driver = alloc_tty_driver(128);
3979 if (!serial_driver) {
3980 rc = -ENOMEM;
3981 goto error;
3982 }
3983
3984 /* Initialize the tty_driver structure */
3985
3986 serial_driver->owner = THIS_MODULE;
3987 serial_driver->driver_name = "synclinkmp";
3988 serial_driver->name = "ttySLM";
3989 serial_driver->major = ttymajor;
3990 serial_driver->minor_start = 64;
3991 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3992 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3993 serial_driver->init_termios = tty_std_termios;
3994 serial_driver->init_termios.c_cflag =
3995 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3996 serial_driver->init_termios.c_ispeed = 9600;
3997 serial_driver->init_termios.c_ospeed = 9600;
3998 serial_driver->flags = TTY_DRIVER_REAL_RAW;
3999 tty_set_operations(serial_driver, &ops);
4000 if ((rc = tty_register_driver(serial_driver)) < 0) {
4001 printk("%s(%d):Couldn't register serial driver\n",
4002 __FILE__,__LINE__);
4003 put_tty_driver(serial_driver);
4004 serial_driver = NULL;
4005 goto error;
4006 }
4007
4008 printk("%s %s, tty major#%d\n",
4009 driver_name, driver_version,
4010 serial_driver->major);
4011
4012 return 0;
4013
4014 error:
4015 synclinkmp_cleanup();
4016 return rc;
4017 }
4018
4019 static void __exit synclinkmp_exit(void)
4020 {
4021 synclinkmp_cleanup();
4022 }
4023
4024 module_init(synclinkmp_init);
4025 module_exit(synclinkmp_exit);
4026
4027 /* Set the port for internal loopback mode.
4028 * The TxCLK and RxCLK signals are generated from the BRG and
4029 * the TxD is looped back to the RxD internally.
4030 */
4031 static void enable_loopback(SLMP_INFO *info, int enable)
4032 {
4033 if (enable) {
4034 /* MD2 (Mode Register 2)
4035 * 01..00 CNCT<1..0> Channel Connection 11=Local Loopback
4036 */
4037 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4038
4039 /* degate external TxC clock source */
4040 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4041 write_control_reg(info);
4042
4043 /* RXS/TXS (Rx/Tx clock source)
4044 * 07 Reserved, must be 0
4045 * 06..04 Clock Source, 100=BRG
4046 * 03..00 Clock Divisor, 0000=1
4047 */
4048 write_reg(info, RXS, 0x40);
4049 write_reg(info, TXS, 0x40);
4050
4051 } else {
4052 /* MD2 (Mode Register 2)
4053 * 01..00 CNCT<1..0> Channel connection, 0=normal
4054 */
4055 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4056
4057 /* RXS/TXS (Rx/Tx clock source)
4058 * 07 Reserved, must be 0
4059 * 06..04 Clock Source, 000=RxC/TxC Pin
4060 * 03..00 Clock Divisor, 0000=1
4061 */
4062 write_reg(info, RXS, 0x00);
4063 write_reg(info, TXS, 0x00);
4064 }
4065
4066 /* set LinkSpeed if available, otherwise default to 2Mbps */
4067 if (info->params.clock_speed)
4068 set_rate(info, info->params.clock_speed);
4069 else
4070 set_rate(info, 3686400);
4071 }
4072
4073 /* Set the baud rate register to the desired speed
4074 *
4075 * data_rate data rate of clock in bits per second
4076 * A data rate of 0 disables the AUX clock.
4077 */
4078 static void set_rate( SLMP_INFO *info, u32 data_rate )
4079 {
4080 u32 TMCValue;
4081 unsigned char BRValue;
4082 u32 Divisor=0;
4083
4084 /* fBRG = fCLK/(TMC * 2^BR)
4085 */
4086 if (data_rate != 0) {
4087 Divisor = 14745600/data_rate;
4088 if (!Divisor)
4089 Divisor = 1;
4090
4091 TMCValue = Divisor;
4092
4093 BRValue = 0;
4094 if (TMCValue != 1 && TMCValue != 2) {
4095 /* BRValue of 0 provides 50/50 duty cycle *only* when
4096 * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4097 * 50/50 duty cycle.
4098 */
4099 BRValue = 1;
4100 TMCValue >>= 1;
4101 }
4102
4103 /* while TMCValue is too big for TMC register, divide
4104 * by 2 and increment BR exponent.
4105 */
4106 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4107 TMCValue >>= 1;
4108
4109 write_reg(info, TXS,
4110 (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4111 write_reg(info, RXS,
4112 (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4113 write_reg(info, TMC, (unsigned char)TMCValue);
4114 }
4115 else {
4116 write_reg(info, TXS,0);
4117 write_reg(info, RXS,0);
4118 write_reg(info, TMC, 0);
4119 }
4120 }
4121
4122 /* Disable receiver
4123 */
4124 static void rx_stop(SLMP_INFO *info)
4125 {
4126 if (debug_level >= DEBUG_LEVEL_ISR)
4127 printk("%s(%d):%s rx_stop()\n",
4128 __FILE__,__LINE__, info->device_name );
4129
4130 write_reg(info, CMD, RXRESET);
4131
4132 info->ie0_value &= ~RXRDYE;
4133 write_reg(info, IE0, info->ie0_value); /* disable Rx data interrupts */
4134
4135 write_reg(info, RXDMA + DSR, 0); /* disable Rx DMA */
4136 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4137 write_reg(info, RXDMA + DIR, 0); /* disable Rx DMA interrupts */
4138
4139 info->rx_enabled = false;
4140 info->rx_overflow = false;
4141 }
4142
4143 /* enable the receiver
4144 */
4145 static void rx_start(SLMP_INFO *info)
4146 {
4147 int i;
4148
4149 if (debug_level >= DEBUG_LEVEL_ISR)
4150 printk("%s(%d):%s rx_start()\n",
4151 __FILE__,__LINE__, info->device_name );
4152
4153 write_reg(info, CMD, RXRESET);
4154
4155 if ( info->params.mode == MGSL_MODE_HDLC ) {
4156 /* HDLC, disabe IRQ on rxdata */
4157 info->ie0_value &= ~RXRDYE;
4158 write_reg(info, IE0, info->ie0_value);
4159
4160 /* Reset all Rx DMA buffers and program rx dma */
4161 write_reg(info, RXDMA + DSR, 0); /* disable Rx DMA */
4162 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4163
4164 for (i = 0; i < info->rx_buf_count; i++) {
4165 info->rx_buf_list[i].status = 0xff;
4166
4167 // throttle to 4 shared memory writes at a time to prevent
4168 // hogging local bus (keep latency time for DMA requests low).
4169 if (!(i % 4))
4170 read_status_reg(info);
4171 }
4172 info->current_rx_buf = 0;
4173
4174 /* set current/1st descriptor address */
4175 write_reg16(info, RXDMA + CDA,
4176 info->rx_buf_list_ex[0].phys_entry);
4177
4178 /* set new last rx descriptor address */
4179 write_reg16(info, RXDMA + EDA,
4180 info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4181
4182 /* set buffer length (shared by all rx dma data buffers) */
4183 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4184
4185 write_reg(info, RXDMA + DIR, 0x60); /* enable Rx DMA interrupts (EOM/BOF) */
4186 write_reg(info, RXDMA + DSR, 0xf2); /* clear Rx DMA IRQs, enable Rx DMA */
4187 } else {
4188 /* async, enable IRQ on rxdata */
4189 info->ie0_value |= RXRDYE;
4190 write_reg(info, IE0, info->ie0_value);
4191 }
4192
4193 write_reg(info, CMD, RXENABLE);
4194
4195 info->rx_overflow = false;
4196 info->rx_enabled = true;
4197 }
4198
4199 /* Enable the transmitter and send a transmit frame if
4200 * one is loaded in the DMA buffers.
4201 */
4202 static void tx_start(SLMP_INFO *info)
4203 {
4204 if (debug_level >= DEBUG_LEVEL_ISR)
4205 printk("%s(%d):%s tx_start() tx_count=%d\n",
4206 __FILE__,__LINE__, info->device_name,info->tx_count );
4207
4208 if (!info->tx_enabled ) {
4209 write_reg(info, CMD, TXRESET);
4210 write_reg(info, CMD, TXENABLE);
4211 info->tx_enabled = true;
4212 }
4213
4214 if ( info->tx_count ) {
4215
4216 /* If auto RTS enabled and RTS is inactive, then assert */
4217 /* RTS and set a flag indicating that the driver should */
4218 /* negate RTS when the transmission completes. */
4219
4220 info->drop_rts_on_tx_done = false;
4221
4222 if (info->params.mode != MGSL_MODE_ASYNC) {
4223
4224 if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4225 get_signals( info );
4226 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4227 info->serial_signals |= SerialSignal_RTS;
4228 set_signals( info );
4229 info->drop_rts_on_tx_done = true;
4230 }
4231 }
4232
4233 write_reg16(info, TRC0,
4234 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4235
4236 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
4237 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4238
4239 /* set TX CDA (current descriptor address) */
4240 write_reg16(info, TXDMA + CDA,
4241 info->tx_buf_list_ex[0].phys_entry);
4242
4243 /* set TX EDA (last descriptor address) */
4244 write_reg16(info, TXDMA + EDA,
4245 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4246
4247 /* enable underrun IRQ */
4248 info->ie1_value &= ~IDLE;
4249 info->ie1_value |= UDRN;
4250 write_reg(info, IE1, info->ie1_value);
4251 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4252
4253 write_reg(info, TXDMA + DIR, 0x40); /* enable Tx DMA interrupts (EOM) */
4254 write_reg(info, TXDMA + DSR, 0xf2); /* clear Tx DMA IRQs, enable Tx DMA */
4255
4256 mod_timer(&info->tx_timer, jiffies +
4257 msecs_to_jiffies(5000));
4258 }
4259 else {
4260 tx_load_fifo(info);
4261 /* async, enable IRQ on txdata */
4262 info->ie0_value |= TXRDYE;
4263 write_reg(info, IE0, info->ie0_value);
4264 }
4265
4266 info->tx_active = true;
4267 }
4268 }
4269
4270 /* stop the transmitter and DMA
4271 */
4272 static void tx_stop( SLMP_INFO *info )
4273 {
4274 if (debug_level >= DEBUG_LEVEL_ISR)
4275 printk("%s(%d):%s tx_stop()\n",
4276 __FILE__,__LINE__, info->device_name );
4277
4278 del_timer(&info->tx_timer);
4279
4280 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
4281 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4282
4283 write_reg(info, CMD, TXRESET);
4284
4285 info->ie1_value &= ~(UDRN + IDLE);
4286 write_reg(info, IE1, info->ie1_value); /* disable tx status interrupts */
4287 write_reg(info, SR1, (unsigned char)(IDLE + UDRN)); /* clear pending */
4288
4289 info->ie0_value &= ~TXRDYE;
4290 write_reg(info, IE0, info->ie0_value); /* disable tx data interrupts */
4291
4292 info->tx_enabled = false;
4293 info->tx_active = false;
4294 }
4295
4296 /* Fill the transmit FIFO until the FIFO is full or
4297 * there is no more data to load.
4298 */
4299 static void tx_load_fifo(SLMP_INFO *info)
4300 {
4301 u8 TwoBytes[2];
4302
4303 /* do nothing is now tx data available and no XON/XOFF pending */
4304
4305 if ( !info->tx_count && !info->x_char )
4306 return;
4307
4308 /* load the Transmit FIFO until FIFOs full or all data sent */
4309
4310 while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4311
4312 /* there is more space in the transmit FIFO and */
4313 /* there is more data in transmit buffer */
4314
4315 if ( (info->tx_count > 1) && !info->x_char ) {
4316 /* write 16-bits */
4317 TwoBytes[0] = info->tx_buf[info->tx_get++];
4318 if (info->tx_get >= info->max_frame_size)
4319 info->tx_get -= info->max_frame_size;
4320 TwoBytes[1] = info->tx_buf[info->tx_get++];
4321 if (info->tx_get >= info->max_frame_size)
4322 info->tx_get -= info->max_frame_size;
4323
4324 write_reg16(info, TRB, *((u16 *)TwoBytes));
4325
4326 info->tx_count -= 2;
4327 info->icount.tx += 2;
4328 } else {
4329 /* only 1 byte left to transmit or 1 FIFO slot left */
4330
4331 if (info->x_char) {
4332 /* transmit pending high priority char */
4333 write_reg(info, TRB, info->x_char);
4334 info->x_char = 0;
4335 } else {
4336 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4337 if (info->tx_get >= info->max_frame_size)
4338 info->tx_get -= info->max_frame_size;
4339 info->tx_count--;
4340 }
4341 info->icount.tx++;
4342 }
4343 }
4344 }
4345
4346 /* Reset a port to a known state
4347 */
4348 static void reset_port(SLMP_INFO *info)
4349 {
4350 if (info->sca_base) {
4351
4352 tx_stop(info);
4353 rx_stop(info);
4354
4355 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
4356 set_signals(info);
4357
4358 /* disable all port interrupts */
4359 info->ie0_value = 0;
4360 info->ie1_value = 0;
4361 info->ie2_value = 0;
4362 write_reg(info, IE0, info->ie0_value);
4363 write_reg(info, IE1, info->ie1_value);
4364 write_reg(info, IE2, info->ie2_value);
4365
4366 write_reg(info, CMD, CHRESET);
4367 }
4368 }
4369
4370 /* Reset all the ports to a known state.
4371 */
4372 static void reset_adapter(SLMP_INFO *info)
4373 {
4374 int i;
4375
4376 for ( i=0; i < SCA_MAX_PORTS; ++i) {
4377 if (info->port_array[i])
4378 reset_port(info->port_array[i]);
4379 }
4380 }
4381
4382 /* Program port for asynchronous communications.
4383 */
4384 static void async_mode(SLMP_INFO *info)
4385 {
4386
4387 unsigned char RegValue;
4388
4389 tx_stop(info);
4390 rx_stop(info);
4391
4392 /* MD0, Mode Register 0
4393 *
4394 * 07..05 PRCTL<2..0>, Protocol Mode, 000=async
4395 * 04 AUTO, Auto-enable (RTS/CTS/DCD)
4396 * 03 Reserved, must be 0
4397 * 02 CRCCC, CRC Calculation, 0=disabled
4398 * 01..00 STOP<1..0> Stop bits (00=1,10=2)
4399 *
4400 * 0000 0000
4401 */
4402 RegValue = 0x00;
4403 if (info->params.stop_bits != 1)
4404 RegValue |= BIT1;
4405 write_reg(info, MD0, RegValue);
4406
4407 /* MD1, Mode Register 1
4408 *
4409 * 07..06 BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4410 * 05..04 TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4411 * 03..02 RXCHR<1..0>, rx char size
4412 * 01..00 PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4413 *
4414 * 0100 0000
4415 */
4416 RegValue = 0x40;
4417 switch (info->params.data_bits) {
4418 case 7: RegValue |= BIT4 + BIT2; break;
4419 case 6: RegValue |= BIT5 + BIT3; break;
4420 case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4421 }
4422 if (info->params.parity != ASYNC_PARITY_NONE) {
4423 RegValue |= BIT1;
4424 if (info->params.parity == ASYNC_PARITY_ODD)
4425 RegValue |= BIT0;
4426 }
4427 write_reg(info, MD1, RegValue);
4428
4429 /* MD2, Mode Register 2
4430 *
4431 * 07..02 Reserved, must be 0
4432 * 01..00 CNCT<1..0> Channel connection, 00=normal 11=local loopback
4433 *
4434 * 0000 0000
4435 */
4436 RegValue = 0x00;
4437 if (info->params.loopback)
4438 RegValue |= (BIT1 + BIT0);
4439 write_reg(info, MD2, RegValue);
4440
4441 /* RXS, Receive clock source
4442 *
4443 * 07 Reserved, must be 0
4444 * 06..04 RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4445 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4446 */
4447 RegValue=BIT6;
4448 write_reg(info, RXS, RegValue);
4449
4450 /* TXS, Transmit clock source
4451 *
4452 * 07 Reserved, must be 0
4453 * 06..04 RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4454 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4455 */
4456 RegValue=BIT6;
4457 write_reg(info, TXS, RegValue);
4458
4459 /* Control Register
4460 *
4461 * 6,4,2,0 CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4462 */
4463 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4464 write_control_reg(info);
4465
4466 tx_set_idle(info);
4467
4468 /* RRC Receive Ready Control 0
4469 *
4470 * 07..05 Reserved, must be 0
4471 * 04..00 RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4472 */
4473 write_reg(info, RRC, 0x00);
4474
4475 /* TRC0 Transmit Ready Control 0
4476 *
4477 * 07..05 Reserved, must be 0
4478 * 04..00 TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4479 */
4480 write_reg(info, TRC0, 0x10);
4481
4482 /* TRC1 Transmit Ready Control 1
4483 *
4484 * 07..05 Reserved, must be 0
4485 * 04..00 TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4486 */
4487 write_reg(info, TRC1, 0x1e);
4488
4489 /* CTL, MSCI control register
4490 *
4491 * 07..06 Reserved, set to 0
4492 * 05 UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4493 * 04 IDLC, idle control, 0=mark 1=idle register
4494 * 03 BRK, break, 0=off 1 =on (async)
4495 * 02 SYNCLD, sync char load enable (BSC) 1=enabled
4496 * 01 GOP, go active on poll (LOOP mode) 1=enabled
4497 * 00 RTS, RTS output control, 0=active 1=inactive
4498 *
4499 * 0001 0001
4500 */
4501 RegValue = 0x10;
4502 if (!(info->serial_signals & SerialSignal_RTS))
4503 RegValue |= 0x01;
4504 write_reg(info, CTL, RegValue);
4505
4506 /* enable status interrupts */
4507 info->ie0_value |= TXINTE + RXINTE;
4508 write_reg(info, IE0, info->ie0_value);
4509
4510 /* enable break detect interrupt */
4511 info->ie1_value = BRKD;
4512 write_reg(info, IE1, info->ie1_value);
4513
4514 /* enable rx overrun interrupt */
4515 info->ie2_value = OVRN;
4516 write_reg(info, IE2, info->ie2_value);
4517
4518 set_rate( info, info->params.data_rate * 16 );
4519 }
4520
4521 /* Program the SCA for HDLC communications.
4522 */
4523 static void hdlc_mode(SLMP_INFO *info)
4524 {
4525 unsigned char RegValue;
4526 u32 DpllDivisor;
4527
4528 // Can't use DPLL because SCA outputs recovered clock on RxC when
4529 // DPLL mode selected. This causes output contention with RxC receiver.
4530 // Use of DPLL would require external hardware to disable RxC receiver
4531 // when DPLL mode selected.
4532 info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4533
4534 /* disable DMA interrupts */
4535 write_reg(info, TXDMA + DIR, 0);
4536 write_reg(info, RXDMA + DIR, 0);
4537
4538 /* MD0, Mode Register 0
4539 *
4540 * 07..05 PRCTL<2..0>, Protocol Mode, 100=HDLC
4541 * 04 AUTO, Auto-enable (RTS/CTS/DCD)
4542 * 03 Reserved, must be 0
4543 * 02 CRCCC, CRC Calculation, 1=enabled
4544 * 01 CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4545 * 00 CRC0, CRC initial value, 1 = all 1s
4546 *
4547 * 1000 0001
4548 */
4549 RegValue = 0x81;
4550 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4551 RegValue |= BIT4;
4552 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4553 RegValue |= BIT4;
4554 if (info->params.crc_type == HDLC_CRC_16_CCITT)
4555 RegValue |= BIT2 + BIT1;
4556 write_reg(info, MD0, RegValue);
4557
4558 /* MD1, Mode Register 1
4559 *
4560 * 07..06 ADDRS<1..0>, Address detect, 00=no addr check
4561 * 05..04 TXCHR<1..0>, tx char size, 00=8 bits
4562 * 03..02 RXCHR<1..0>, rx char size, 00=8 bits
4563 * 01..00 PMPM<1..0>, Parity mode, 00=no parity
4564 *
4565 * 0000 0000
4566 */
4567 RegValue = 0x00;
4568 write_reg(info, MD1, RegValue);
4569
4570 /* MD2, Mode Register 2
4571 *
4572 * 07 NRZFM, 0=NRZ, 1=FM
4573 * 06..05 CODE<1..0> Encoding, 00=NRZ
4574 * 04..03 DRATE<1..0> DPLL Divisor, 00=8
4575 * 02 Reserved, must be 0
4576 * 01..00 CNCT<1..0> Channel connection, 0=normal
4577 *
4578 * 0000 0000
4579 */
4580 RegValue = 0x00;
4581 switch(info->params.encoding) {
4582 case HDLC_ENCODING_NRZI: RegValue |= BIT5; break;
4583 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4584 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4585 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break; /* aka Manchester */
4586 #if 0
4587 case HDLC_ENCODING_NRZB: /* not supported */
4588 case HDLC_ENCODING_NRZI_MARK: /* not supported */
4589 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: /* not supported */
4590 #endif
4591 }
4592 if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4593 DpllDivisor = 16;
4594 RegValue |= BIT3;
4595 } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4596 DpllDivisor = 8;
4597 } else {
4598 DpllDivisor = 32;
4599 RegValue |= BIT4;
4600 }
4601 write_reg(info, MD2, RegValue);
4602
4603
4604 /* RXS, Receive clock source
4605 *
4606 * 07 Reserved, must be 0
4607 * 06..04 RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4608 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4609 */
4610 RegValue=0;
4611 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4612 RegValue |= BIT6;
4613 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4614 RegValue |= BIT6 + BIT5;
4615 write_reg(info, RXS, RegValue);
4616
4617 /* TXS, Transmit clock source
4618 *
4619 * 07 Reserved, must be 0
4620 * 06..04 RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4621 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4622 */
4623 RegValue=0;
4624 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4625 RegValue |= BIT6;
4626 if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4627 RegValue |= BIT6 + BIT5;
4628 write_reg(info, TXS, RegValue);
4629
4630 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4631 set_rate(info, info->params.clock_speed * DpllDivisor);
4632 else
4633 set_rate(info, info->params.clock_speed);
4634
4635 /* GPDATA (General Purpose I/O Data Register)
4636 *
4637 * 6,4,2,0 CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4638 */
4639 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4640 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4641 else
4642 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4643 write_control_reg(info);
4644
4645 /* RRC Receive Ready Control 0
4646 *
4647 * 07..05 Reserved, must be 0
4648 * 04..00 RRC<4..0> Rx FIFO trigger active
4649 */
4650 write_reg(info, RRC, rx_active_fifo_level);
4651
4652 /* TRC0 Transmit Ready Control 0
4653 *
4654 * 07..05 Reserved, must be 0
4655 * 04..00 TRC<4..0> Tx FIFO trigger active
4656 */
4657 write_reg(info, TRC0, tx_active_fifo_level);
4658
4659 /* TRC1 Transmit Ready Control 1
4660 *
4661 * 07..05 Reserved, must be 0
4662 * 04..00 TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4663 */
4664 write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4665
4666 /* DMR, DMA Mode Register
4667 *
4668 * 07..05 Reserved, must be 0
4669 * 04 TMOD, Transfer Mode: 1=chained-block
4670 * 03 Reserved, must be 0
4671 * 02 NF, Number of Frames: 1=multi-frame
4672 * 01 CNTE, Frame End IRQ Counter enable: 0=disabled
4673 * 00 Reserved, must be 0
4674 *
4675 * 0001 0100
4676 */
4677 write_reg(info, TXDMA + DMR, 0x14);
4678 write_reg(info, RXDMA + DMR, 0x14);
4679
4680 /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4681 write_reg(info, RXDMA + CPB,
4682 (unsigned char)(info->buffer_list_phys >> 16));
4683
4684 /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4685 write_reg(info, TXDMA + CPB,
4686 (unsigned char)(info->buffer_list_phys >> 16));
4687
4688 /* enable status interrupts. other code enables/disables
4689 * the individual sources for these two interrupt classes.
4690 */
4691 info->ie0_value |= TXINTE + RXINTE;
4692 write_reg(info, IE0, info->ie0_value);
4693
4694 /* CTL, MSCI control register
4695 *
4696 * 07..06 Reserved, set to 0
4697 * 05 UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4698 * 04 IDLC, idle control, 0=mark 1=idle register
4699 * 03 BRK, break, 0=off 1 =on (async)
4700 * 02 SYNCLD, sync char load enable (BSC) 1=enabled
4701 * 01 GOP, go active on poll (LOOP mode) 1=enabled
4702 * 00 RTS, RTS output control, 0=active 1=inactive
4703 *
4704 * 0001 0001
4705 */
4706 RegValue = 0x10;
4707 if (!(info->serial_signals & SerialSignal_RTS))
4708 RegValue |= 0x01;
4709 write_reg(info, CTL, RegValue);
4710
4711 /* preamble not supported ! */
4712
4713 tx_set_idle(info);
4714 tx_stop(info);
4715 rx_stop(info);
4716
4717 set_rate(info, info->params.clock_speed);
4718
4719 if (info->params.loopback)
4720 enable_loopback(info,1);
4721 }
4722
4723 /* Set the transmit HDLC idle mode
4724 */
4725 static void tx_set_idle(SLMP_INFO *info)
4726 {
4727 unsigned char RegValue = 0xff;
4728
4729 /* Map API idle mode to SCA register bits */
4730 switch(info->idle_mode) {
4731 case HDLC_TXIDLE_FLAGS: RegValue = 0x7e; break;
4732 case HDLC_TXIDLE_ALT_ZEROS_ONES: RegValue = 0xaa; break;
4733 case HDLC_TXIDLE_ZEROS: RegValue = 0x00; break;
4734 case HDLC_TXIDLE_ONES: RegValue = 0xff; break;
4735 case HDLC_TXIDLE_ALT_MARK_SPACE: RegValue = 0xaa; break;
4736 case HDLC_TXIDLE_SPACE: RegValue = 0x00; break;
4737 case HDLC_TXIDLE_MARK: RegValue = 0xff; break;
4738 }
4739
4740 write_reg(info, IDL, RegValue);
4741 }
4742
4743 /* Query the adapter for the state of the V24 status (input) signals.
4744 */
4745 static void get_signals(SLMP_INFO *info)
4746 {
4747 u16 status = read_reg(info, SR3);
4748 u16 gpstatus = read_status_reg(info);
4749 u16 testbit;
4750
4751 /* clear all serial signals except DTR and RTS */
4752 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
4753
4754 /* set serial signal bits to reflect MISR */
4755
4756 if (!(status & BIT3))
4757 info->serial_signals |= SerialSignal_CTS;
4758
4759 if ( !(status & BIT2))
4760 info->serial_signals |= SerialSignal_DCD;
4761
4762 testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4763 if (!(gpstatus & testbit))
4764 info->serial_signals |= SerialSignal_RI;
4765
4766 testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4767 if (!(gpstatus & testbit))
4768 info->serial_signals |= SerialSignal_DSR;
4769 }
4770
4771 /* Set the state of DTR and RTS based on contents of
4772 * serial_signals member of device context.
4773 */
4774 static void set_signals(SLMP_INFO *info)
4775 {
4776 unsigned char RegValue;
4777 u16 EnableBit;
4778
4779 RegValue = read_reg(info, CTL);
4780 if (info->serial_signals & SerialSignal_RTS)
4781 RegValue &= ~BIT0;
4782 else
4783 RegValue |= BIT0;
4784 write_reg(info, CTL, RegValue);
4785
4786 // Port 0..3 DTR is ctrl reg <1,3,5,7>
4787 EnableBit = BIT1 << (info->port_num*2);
4788 if (info->serial_signals & SerialSignal_DTR)
4789 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4790 else
4791 info->port_array[0]->ctrlreg_value |= EnableBit;
4792 write_control_reg(info);
4793 }
4794
4795 /*******************/
4796 /* DMA Buffer Code */
4797 /*******************/
4798
4799 /* Set the count for all receive buffers to SCABUFSIZE
4800 * and set the current buffer to the first buffer. This effectively
4801 * makes all buffers free and discards any data in buffers.
4802 */
4803 static void rx_reset_buffers(SLMP_INFO *info)
4804 {
4805 rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4806 }
4807
4808 /* Free the buffers used by a received frame
4809 *
4810 * info pointer to device instance data
4811 * first index of 1st receive buffer of frame
4812 * last index of last receive buffer of frame
4813 */
4814 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4815 {
4816 bool done = false;
4817
4818 while(!done) {
4819 /* reset current buffer for reuse */
4820 info->rx_buf_list[first].status = 0xff;
4821
4822 if (first == last) {
4823 done = true;
4824 /* set new last rx descriptor address */
4825 write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4826 }
4827
4828 first++;
4829 if (first == info->rx_buf_count)
4830 first = 0;
4831 }
4832
4833 /* set current buffer to next buffer after last buffer of frame */
4834 info->current_rx_buf = first;
4835 }
4836
4837 /* Return a received frame from the receive DMA buffers.
4838 * Only frames received without errors are returned.
4839 *
4840 * Return Value: true if frame returned, otherwise false
4841 */
4842 static bool rx_get_frame(SLMP_INFO *info)
4843 {
4844 unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
4845 unsigned short status;
4846 unsigned int framesize = 0;
4847 bool ReturnCode = false;
4848 unsigned long flags;
4849 struct tty_struct *tty = info->port.tty;
4850 unsigned char addr_field = 0xff;
4851 SCADESC *desc;
4852 SCADESC_EX *desc_ex;
4853
4854 CheckAgain:
4855 /* assume no frame returned, set zero length */
4856 framesize = 0;
4857 addr_field = 0xff;
4858
4859 /*
4860 * current_rx_buf points to the 1st buffer of the next available
4861 * receive frame. To find the last buffer of the frame look for
4862 * a non-zero status field in the buffer entries. (The status
4863 * field is set by the 16C32 after completing a receive frame.
4864 */
4865 StartIndex = EndIndex = info->current_rx_buf;
4866
4867 for ( ;; ) {
4868 desc = &info->rx_buf_list[EndIndex];
4869 desc_ex = &info->rx_buf_list_ex[EndIndex];
4870
4871 if (desc->status == 0xff)
4872 goto Cleanup; /* current desc still in use, no frames available */
4873
4874 if (framesize == 0 && info->params.addr_filter != 0xff)
4875 addr_field = desc_ex->virt_addr[0];
4876
4877 framesize += desc->length;
4878
4879 /* Status != 0 means last buffer of frame */
4880 if (desc->status)
4881 break;
4882
4883 EndIndex++;
4884 if (EndIndex == info->rx_buf_count)
4885 EndIndex = 0;
4886
4887 if (EndIndex == info->current_rx_buf) {
4888 /* all buffers have been 'used' but none mark */
4889 /* the end of a frame. Reset buffers and receiver. */
4890 if ( info->rx_enabled ){
4891 spin_lock_irqsave(&info->lock,flags);
4892 rx_start(info);
4893 spin_unlock_irqrestore(&info->lock,flags);
4894 }
4895 goto Cleanup;
4896 }
4897
4898 }
4899
4900 /* check status of receive frame */
4901
4902 /* frame status is byte stored after frame data
4903 *
4904 * 7 EOM (end of msg), 1 = last buffer of frame
4905 * 6 Short Frame, 1 = short frame
4906 * 5 Abort, 1 = frame aborted
4907 * 4 Residue, 1 = last byte is partial
4908 * 3 Overrun, 1 = overrun occurred during frame reception
4909 * 2 CRC, 1 = CRC error detected
4910 *
4911 */
4912 status = desc->status;
4913
4914 /* ignore CRC bit if not using CRC (bit is undefined) */
4915 /* Note:CRC is not save to data buffer */
4916 if (info->params.crc_type == HDLC_CRC_NONE)
4917 status &= ~BIT2;
4918
4919 if (framesize == 0 ||
4920 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4921 /* discard 0 byte frames, this seems to occur sometime
4922 * when remote is idling flags.
4923 */
4924 rx_free_frame_buffers(info, StartIndex, EndIndex);
4925 goto CheckAgain;
4926 }
4927
4928 if (framesize < 2)
4929 status |= BIT6;
4930
4931 if (status & (BIT6+BIT5+BIT3+BIT2)) {
4932 /* received frame has errors,
4933 * update counts and mark frame size as 0
4934 */
4935 if (status & BIT6)
4936 info->icount.rxshort++;
4937 else if (status & BIT5)
4938 info->icount.rxabort++;
4939 else if (status & BIT3)
4940 info->icount.rxover++;
4941 else
4942 info->icount.rxcrc++;
4943
4944 framesize = 0;
4945 #if SYNCLINK_GENERIC_HDLC
4946 {
4947 info->netdev->stats.rx_errors++;
4948 info->netdev->stats.rx_frame_errors++;
4949 }
4950 #endif
4951 }
4952
4953 if ( debug_level >= DEBUG_LEVEL_BH )
4954 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4955 __FILE__,__LINE__,info->device_name,status,framesize);
4956
4957 if ( debug_level >= DEBUG_LEVEL_DATA )
4958 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
4959 min_t(int, framesize,SCABUFSIZE),0);
4960
4961 if (framesize) {
4962 if (framesize > info->max_frame_size)
4963 info->icount.rxlong++;
4964 else {
4965 /* copy dma buffer(s) to contiguous intermediate buffer */
4966 int copy_count = framesize;
4967 int index = StartIndex;
4968 unsigned char *ptmp = info->tmp_rx_buf;
4969 info->tmp_rx_buf_count = framesize;
4970
4971 info->icount.rxok++;
4972
4973 while(copy_count) {
4974 int partial_count = min(copy_count,SCABUFSIZE);
4975 memcpy( ptmp,
4976 info->rx_buf_list_ex[index].virt_addr,
4977 partial_count );
4978 ptmp += partial_count;
4979 copy_count -= partial_count;
4980
4981 if ( ++index == info->rx_buf_count )
4982 index = 0;
4983 }
4984
4985 #if SYNCLINK_GENERIC_HDLC
4986 if (info->netcount)
4987 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
4988 else
4989 #endif
4990 ldisc_receive_buf(tty,info->tmp_rx_buf,
4991 info->flag_buf, framesize);
4992 }
4993 }
4994 /* Free the buffers used by this frame. */
4995 rx_free_frame_buffers( info, StartIndex, EndIndex );
4996
4997 ReturnCode = true;
4998
4999 Cleanup:
5000 if ( info->rx_enabled && info->rx_overflow ) {
5001 /* Receiver is enabled, but needs to restarted due to
5002 * rx buffer overflow. If buffers are empty, restart receiver.
5003 */
5004 if (info->rx_buf_list[EndIndex].status == 0xff) {
5005 spin_lock_irqsave(&info->lock,flags);
5006 rx_start(info);
5007 spin_unlock_irqrestore(&info->lock,flags);
5008 }
5009 }
5010
5011 return ReturnCode;
5012 }
5013
5014 /* load the transmit DMA buffer with data
5015 */
5016 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5017 {
5018 unsigned short copy_count;
5019 unsigned int i = 0;
5020 SCADESC *desc;
5021 SCADESC_EX *desc_ex;
5022
5023 if ( debug_level >= DEBUG_LEVEL_DATA )
5024 trace_block(info,buf, min_t(int, count,SCABUFSIZE), 1);
5025
5026 /* Copy source buffer to one or more DMA buffers, starting with
5027 * the first transmit dma buffer.
5028 */
5029 for(i=0;;)
5030 {
5031 copy_count = min_t(unsigned short,count,SCABUFSIZE);
5032
5033 desc = &info->tx_buf_list[i];
5034 desc_ex = &info->tx_buf_list_ex[i];
5035
5036 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5037
5038 desc->length = copy_count;
5039 desc->status = 0;
5040
5041 buf += copy_count;
5042 count -= copy_count;
5043
5044 if (!count)
5045 break;
5046
5047 i++;
5048 if (i >= info->tx_buf_count)
5049 i = 0;
5050 }
5051
5052 info->tx_buf_list[i].status = 0x81; /* set EOM and EOT status */
5053 info->last_tx_buf = ++i;
5054 }
5055
5056 static bool register_test(SLMP_INFO *info)
5057 {
5058 static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5059 static unsigned int count = ARRAY_SIZE(testval);
5060 unsigned int i;
5061 bool rc = true;
5062 unsigned long flags;
5063
5064 spin_lock_irqsave(&info->lock,flags);
5065 reset_port(info);
5066
5067 /* assume failure */
5068 info->init_error = DiagStatus_AddressFailure;
5069
5070 /* Write bit patterns to various registers but do it out of */
5071 /* sync, then read back and verify values. */
5072
5073 for (i = 0 ; i < count ; i++) {
5074 write_reg(info, TMC, testval[i]);
5075 write_reg(info, IDL, testval[(i+1)%count]);
5076 write_reg(info, SA0, testval[(i+2)%count]);
5077 write_reg(info, SA1, testval[(i+3)%count]);
5078
5079 if ( (read_reg(info, TMC) != testval[i]) ||
5080 (read_reg(info, IDL) != testval[(i+1)%count]) ||
5081 (read_reg(info, SA0) != testval[(i+2)%count]) ||
5082 (read_reg(info, SA1) != testval[(i+3)%count]) )
5083 {
5084 rc = false;
5085 break;
5086 }
5087 }
5088
5089 reset_port(info);
5090 spin_unlock_irqrestore(&info->lock,flags);
5091
5092 return rc;
5093 }
5094
5095 static bool irq_test(SLMP_INFO *info)
5096 {
5097 unsigned long timeout;
5098 unsigned long flags;
5099
5100 unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5101
5102 spin_lock_irqsave(&info->lock,flags);
5103 reset_port(info);
5104
5105 /* assume failure */
5106 info->init_error = DiagStatus_IrqFailure;
5107 info->irq_occurred = false;
5108
5109 /* setup timer0 on SCA0 to interrupt */
5110
5111 /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5112 write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5113
5114 write_reg(info, (unsigned char)(timer + TEPR), 0); /* timer expand prescale */
5115 write_reg16(info, (unsigned char)(timer + TCONR), 1); /* timer constant */
5116
5117
5118 /* TMCS, Timer Control/Status Register
5119 *
5120 * 07 CMF, Compare match flag (read only) 1=match
5121 * 06 ECMI, CMF Interrupt Enable: 1=enabled
5122 * 05 Reserved, must be 0
5123 * 04 TME, Timer Enable
5124 * 03..00 Reserved, must be 0
5125 *
5126 * 0101 0000
5127 */
5128 write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5129
5130 spin_unlock_irqrestore(&info->lock,flags);
5131
5132 timeout=100;
5133 while( timeout-- && !info->irq_occurred ) {
5134 msleep_interruptible(10);
5135 }
5136
5137 spin_lock_irqsave(&info->lock,flags);
5138 reset_port(info);
5139 spin_unlock_irqrestore(&info->lock,flags);
5140
5141 return info->irq_occurred;
5142 }
5143
5144 /* initialize individual SCA device (2 ports)
5145 */
5146 static bool sca_init(SLMP_INFO *info)
5147 {
5148 /* set wait controller to single mem partition (low), no wait states */
5149 write_reg(info, PABR0, 0); /* wait controller addr boundary 0 */
5150 write_reg(info, PABR1, 0); /* wait controller addr boundary 1 */
5151 write_reg(info, WCRL, 0); /* wait controller low range */
5152 write_reg(info, WCRM, 0); /* wait controller mid range */
5153 write_reg(info, WCRH, 0); /* wait controller high range */
5154
5155 /* DPCR, DMA Priority Control
5156 *
5157 * 07..05 Not used, must be 0
5158 * 04 BRC, bus release condition: 0=all transfers complete
5159 * 03 CCC, channel change condition: 0=every cycle
5160 * 02..00 PR<2..0>, priority 100=round robin
5161 *
5162 * 00000100 = 0x04
5163 */
5164 write_reg(info, DPCR, dma_priority);
5165
5166 /* DMA Master Enable, BIT7: 1=enable all channels */
5167 write_reg(info, DMER, 0x80);
5168
5169 /* enable all interrupt classes */
5170 write_reg(info, IER0, 0xff); /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5171 write_reg(info, IER1, 0xff); /* DMIB,DMIA (channels 0-3) */
5172 write_reg(info, IER2, 0xf0); /* TIRQ (timers 0-3) */
5173
5174 /* ITCR, interrupt control register
5175 * 07 IPC, interrupt priority, 0=MSCI->DMA
5176 * 06..05 IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5177 * 04 VOS, Vector Output, 0=unmodified vector
5178 * 03..00 Reserved, must be 0
5179 */
5180 write_reg(info, ITCR, 0);
5181
5182 return true;
5183 }
5184
5185 /* initialize adapter hardware
5186 */
5187 static bool init_adapter(SLMP_INFO *info)
5188 {
5189 int i;
5190
5191 /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5192 volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5193 u32 readval;
5194
5195 info->misc_ctrl_value |= BIT30;
5196 *MiscCtrl = info->misc_ctrl_value;
5197
5198 /*
5199 * Force at least 170ns delay before clearing
5200 * reset bit. Each read from LCR takes at least
5201 * 30ns so 10 times for 300ns to be safe.
5202 */
5203 for(i=0;i<10;i++)
5204 readval = *MiscCtrl;
5205
5206 info->misc_ctrl_value &= ~BIT30;
5207 *MiscCtrl = info->misc_ctrl_value;
5208
5209 /* init control reg (all DTRs off, all clksel=input) */
5210 info->ctrlreg_value = 0xaa;
5211 write_control_reg(info);
5212
5213 {
5214 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5215 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5216
5217 switch(read_ahead_count)
5218 {
5219 case 16:
5220 lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5221 break;
5222 case 8:
5223 lcr1_brdr_value |= BIT5 + BIT4;
5224 break;
5225 case 4:
5226 lcr1_brdr_value |= BIT5 + BIT3;
5227 break;
5228 case 0:
5229 lcr1_brdr_value |= BIT5;
5230 break;
5231 }
5232
5233 *LCR1BRDR = lcr1_brdr_value;
5234 *MiscCtrl = misc_ctrl_value;
5235 }
5236
5237 sca_init(info->port_array[0]);
5238 sca_init(info->port_array[2]);
5239
5240 return true;
5241 }
5242
5243 /* Loopback an HDLC frame to test the hardware
5244 * interrupt and DMA functions.
5245 */
5246 static bool loopback_test(SLMP_INFO *info)
5247 {
5248 #define TESTFRAMESIZE 20
5249
5250 unsigned long timeout;
5251 u16 count = TESTFRAMESIZE;
5252 unsigned char buf[TESTFRAMESIZE];
5253 bool rc = false;
5254 unsigned long flags;
5255
5256 struct tty_struct *oldtty = info->port.tty;
5257 u32 speed = info->params.clock_speed;
5258
5259 info->params.clock_speed = 3686400;
5260 info->port.tty = NULL;
5261
5262 /* assume failure */
5263 info->init_error = DiagStatus_DmaFailure;
5264
5265 /* build and send transmit frame */
5266 for (count = 0; count < TESTFRAMESIZE;++count)
5267 buf[count] = (unsigned char)count;
5268
5269 memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5270
5271 /* program hardware for HDLC and enabled receiver */
5272 spin_lock_irqsave(&info->lock,flags);
5273 hdlc_mode(info);
5274 enable_loopback(info,1);
5275 rx_start(info);
5276 info->tx_count = count;
5277 tx_load_dma_buffer(info,buf,count);
5278 tx_start(info);
5279 spin_unlock_irqrestore(&info->lock,flags);
5280
5281 /* wait for receive complete */
5282 /* Set a timeout for waiting for interrupt. */
5283 for ( timeout = 100; timeout; --timeout ) {
5284 msleep_interruptible(10);
5285
5286 if (rx_get_frame(info)) {
5287 rc = true;
5288 break;
5289 }
5290 }
5291
5292 /* verify received frame length and contents */
5293 if (rc &&
5294 ( info->tmp_rx_buf_count != count ||
5295 memcmp(buf, info->tmp_rx_buf,count))) {
5296 rc = false;
5297 }
5298
5299 spin_lock_irqsave(&info->lock,flags);
5300 reset_adapter(info);
5301 spin_unlock_irqrestore(&info->lock,flags);
5302
5303 info->params.clock_speed = speed;
5304 info->port.tty = oldtty;
5305
5306 return rc;
5307 }
5308
5309 /* Perform diagnostics on hardware
5310 */
5311 static int adapter_test( SLMP_INFO *info )
5312 {
5313 unsigned long flags;
5314 if ( debug_level >= DEBUG_LEVEL_INFO )
5315 printk( "%s(%d):Testing device %s\n",
5316 __FILE__,__LINE__,info->device_name );
5317
5318 spin_lock_irqsave(&info->lock,flags);
5319 init_adapter(info);
5320 spin_unlock_irqrestore(&info->lock,flags);
5321
5322 info->port_array[0]->port_count = 0;
5323
5324 if ( register_test(info->port_array[0]) &&
5325 register_test(info->port_array[1])) {
5326
5327 info->port_array[0]->port_count = 2;
5328
5329 if ( register_test(info->port_array[2]) &&
5330 register_test(info->port_array[3]) )
5331 info->port_array[0]->port_count += 2;
5332 }
5333 else {
5334 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5335 __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5336 return -ENODEV;
5337 }
5338
5339 if ( !irq_test(info->port_array[0]) ||
5340 !irq_test(info->port_array[1]) ||
5341 (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5342 (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5343 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5344 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5345 return -ENODEV;
5346 }
5347
5348 if (!loopback_test(info->port_array[0]) ||
5349 !loopback_test(info->port_array[1]) ||
5350 (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5351 (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5352 printk( "%s(%d):DMA test failure for device %s\n",
5353 __FILE__,__LINE__,info->device_name);
5354 return -ENODEV;
5355 }
5356
5357 if ( debug_level >= DEBUG_LEVEL_INFO )
5358 printk( "%s(%d):device %s passed diagnostics\n",
5359 __FILE__,__LINE__,info->device_name );
5360
5361 info->port_array[0]->init_error = 0;
5362 info->port_array[1]->init_error = 0;
5363 if ( info->port_count > 2 ) {
5364 info->port_array[2]->init_error = 0;
5365 info->port_array[3]->init_error = 0;
5366 }
5367
5368 return 0;
5369 }
5370
5371 /* Test the shared memory on a PCI adapter.
5372 */
5373 static bool memory_test(SLMP_INFO *info)
5374 {
5375 static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5376 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5377 unsigned long count = ARRAY_SIZE(testval);
5378 unsigned long i;
5379 unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5380 unsigned long * addr = (unsigned long *)info->memory_base;
5381
5382 /* Test data lines with test pattern at one location. */
5383
5384 for ( i = 0 ; i < count ; i++ ) {
5385 *addr = testval[i];
5386 if ( *addr != testval[i] )
5387 return false;
5388 }
5389
5390 /* Test address lines with incrementing pattern over */
5391 /* entire address range. */
5392
5393 for ( i = 0 ; i < limit ; i++ ) {
5394 *addr = i * 4;
5395 addr++;
5396 }
5397
5398 addr = (unsigned long *)info->memory_base;
5399
5400 for ( i = 0 ; i < limit ; i++ ) {
5401 if ( *addr != i * 4 )
5402 return false;
5403 addr++;
5404 }
5405
5406 memset( info->memory_base, 0, SCA_MEM_SIZE );
5407 return true;
5408 }
5409
5410 /* Load data into PCI adapter shared memory.
5411 *
5412 * The PCI9050 releases control of the local bus
5413 * after completing the current read or write operation.
5414 *
5415 * While the PCI9050 write FIFO not empty, the
5416 * PCI9050 treats all of the writes as a single transaction
5417 * and does not release the bus. This causes DMA latency problems
5418 * at high speeds when copying large data blocks to the shared memory.
5419 *
5420 * This function breaks a write into multiple transations by
5421 * interleaving a read which flushes the write FIFO and 'completes'
5422 * the write transation. This allows any pending DMA request to gain control
5423 * of the local bus in a timely fasion.
5424 */
5425 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5426 {
5427 /* A load interval of 16 allows for 4 32-bit writes at */
5428 /* 136ns each for a maximum latency of 542ns on the local bus.*/
5429
5430 unsigned short interval = count / sca_pci_load_interval;
5431 unsigned short i;
5432
5433 for ( i = 0 ; i < interval ; i++ )
5434 {
5435 memcpy(dest, src, sca_pci_load_interval);
5436 read_status_reg(info);
5437 dest += sca_pci_load_interval;
5438 src += sca_pci_load_interval;
5439 }
5440
5441 memcpy(dest, src, count % sca_pci_load_interval);
5442 }
5443
5444 static void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5445 {
5446 int i;
5447 int linecount;
5448 if (xmit)
5449 printk("%s tx data:\n",info->device_name);
5450 else
5451 printk("%s rx data:\n",info->device_name);
5452
5453 while(count) {
5454 if (count > 16)
5455 linecount = 16;
5456 else
5457 linecount = count;
5458
5459 for(i=0;i<linecount;i++)
5460 printk("%02X ",(unsigned char)data[i]);
5461 for(;i<17;i++)
5462 printk(" ");
5463 for(i=0;i<linecount;i++) {
5464 if (data[i]>=040 && data[i]<=0176)
5465 printk("%c",data[i]);
5466 else
5467 printk(".");
5468 }
5469 printk("\n");
5470
5471 data += linecount;
5472 count -= linecount;
5473 }
5474 } /* end of trace_block() */
5475
5476 /* called when HDLC frame times out
5477 * update stats and do tx completion processing
5478 */
5479 static void tx_timeout(unsigned long context)
5480 {
5481 SLMP_INFO *info = (SLMP_INFO*)context;
5482 unsigned long flags;
5483
5484 if ( debug_level >= DEBUG_LEVEL_INFO )
5485 printk( "%s(%d):%s tx_timeout()\n",
5486 __FILE__,__LINE__,info->device_name);
5487 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5488 info->icount.txtimeout++;
5489 }
5490 spin_lock_irqsave(&info->lock,flags);
5491 info->tx_active = false;
5492 info->tx_count = info->tx_put = info->tx_get = 0;
5493
5494 spin_unlock_irqrestore(&info->lock,flags);
5495
5496 #if SYNCLINK_GENERIC_HDLC
5497 if (info->netcount)
5498 hdlcdev_tx_done(info);
5499 else
5500 #endif
5501 bh_transmit(info);
5502 }
5503
5504 /* called to periodically check the DSR/RI modem signal input status
5505 */
5506 static void status_timeout(unsigned long context)
5507 {
5508 u16 status = 0;
5509 SLMP_INFO *info = (SLMP_INFO*)context;
5510 unsigned long flags;
5511 unsigned char delta;
5512
5513
5514 spin_lock_irqsave(&info->lock,flags);
5515 get_signals(info);
5516 spin_unlock_irqrestore(&info->lock,flags);
5517
5518 /* check for DSR/RI state change */
5519
5520 delta = info->old_signals ^ info->serial_signals;
5521 info->old_signals = info->serial_signals;
5522
5523 if (delta & SerialSignal_DSR)
5524 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5525
5526 if (delta & SerialSignal_RI)
5527 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5528
5529 if (delta & SerialSignal_DCD)
5530 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5531
5532 if (delta & SerialSignal_CTS)
5533 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5534
5535 if (status)
5536 isr_io_pin(info,status);
5537
5538 mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
5539 }
5540
5541
5542 /* Register Access Routines -
5543 * All registers are memory mapped
5544 */
5545 #define CALC_REGADDR() \
5546 unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5547 if (info->port_num > 1) \
5548 RegAddr += 256; /* port 0-1 SCA0, 2-3 SCA1 */ \
5549 if ( info->port_num & 1) { \
5550 if (Addr > 0x7f) \
5551 RegAddr += 0x40; /* DMA access */ \
5552 else if (Addr > 0x1f && Addr < 0x60) \
5553 RegAddr += 0x20; /* MSCI access */ \
5554 }
5555
5556
5557 static unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5558 {
5559 CALC_REGADDR();
5560 return *RegAddr;
5561 }
5562 static void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5563 {
5564 CALC_REGADDR();
5565 *RegAddr = Value;
5566 }
5567
5568 static u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5569 {
5570 CALC_REGADDR();
5571 return *((u16 *)RegAddr);
5572 }
5573
5574 static void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5575 {
5576 CALC_REGADDR();
5577 *((u16 *)RegAddr) = Value;
5578 }
5579
5580 static unsigned char read_status_reg(SLMP_INFO * info)
5581 {
5582 unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5583 return *RegAddr;
5584 }
5585
5586 static void write_control_reg(SLMP_INFO * info)
5587 {
5588 unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5589 *RegAddr = info->port_array[0]->ctrlreg_value;
5590 }
5591
5592
5593 static int __devinit synclinkmp_init_one (struct pci_dev *dev,
5594 const struct pci_device_id *ent)
5595 {
5596 if (pci_enable_device(dev)) {
5597 printk("error enabling pci device %p\n", dev);
5598 return -EIO;
5599 }
5600 device_init( ++synclinkmp_adapter_count, dev );
5601 return 0;
5602 }
5603
5604 static void __devexit synclinkmp_remove_one (struct pci_dev *dev)
5605 {
5606 }
Support for the Chinese Samsung S3C2440 based development boards