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rcu: make rcutorture even more vicious: invoke RCU readers from irq handlers (timers)
[linux-2.6/libata-dev.git] / drivers / char / synclinkmp.c
blobbec54866e0bb6630b0f6d05f7890daf365695134
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/slab.h>
54 #include <linux/netdevice.h>
55 #include <linux/vmalloc.h>
56 #include <linux/init.h>
57 #include <linux/delay.h>
58 #include <linux/ioctl.h>
59
60 #include <asm/system.h>
61 #include <asm/io.h>
62 #include <asm/irq.h>
63 #include <asm/dma.h>
64 #include <linux/bitops.h>
65 #include <asm/types.h>
66 #include <linux/termios.h>
67 #include <linux/workqueue.h>
68 #include <linux/hdlc.h>
69 #include <linux/synclink.h>
70
71 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINKMP_MODULE))
72 #define SYNCLINK_GENERIC_HDLC 1
73 #else
74 #define SYNCLINK_GENERIC_HDLC 0
75 #endif
76
77 #define GET_USER(error,value,addr) error = get_user(value,addr)
78 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
79 #define PUT_USER(error,value,addr) error = put_user(value,addr)
80 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
81
82 #include <asm/uaccess.h>
83
84 static MGSL_PARAMS default_params = {
85 MGSL_MODE_HDLC, /* unsigned long mode */
86 0, /* unsigned char loopback; */
87 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
88 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
89 0, /* unsigned long clock_speed; */
90 0xff, /* unsigned char addr_filter; */
91 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
92 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
93 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
94 9600, /* unsigned long data_rate; */
95 8, /* unsigned char data_bits; */
96 1, /* unsigned char stop_bits; */
97 ASYNC_PARITY_NONE /* unsigned char parity; */
98 };
99
100 /* size in bytes of DMA data buffers */
101 #define SCABUFSIZE 1024
102 #define SCA_MEM_SIZE 0x40000
103 #define SCA_BASE_SIZE 512
104 #define SCA_REG_SIZE 16
105 #define SCA_MAX_PORTS 4
106 #define SCAMAXDESC 128
107
108 #define BUFFERLISTSIZE 4096
109
110 /* SCA-I style DMA buffer descriptor */
111 typedef struct _SCADESC
112 {
113 u16 next; /* lower l6 bits of next descriptor addr */
114 u16 buf_ptr; /* lower 16 bits of buffer addr */
115 u8 buf_base; /* upper 8 bits of buffer addr */
116 u8 pad1;
117 u16 length; /* length of buffer */
118 u8 status; /* status of buffer */
119 u8 pad2;
120 } SCADESC, *PSCADESC;
121
122 typedef struct _SCADESC_EX
123 {
124 /* device driver bookkeeping section */
125 char *virt_addr; /* virtual address of data buffer */
126 u16 phys_entry; /* lower 16-bits of physical address of this descriptor */
127 } SCADESC_EX, *PSCADESC_EX;
128
129 /* The queue of BH actions to be performed */
130
131 #define BH_RECEIVE 1
132 #define BH_TRANSMIT 2
133 #define BH_STATUS 4
134
135 #define IO_PIN_SHUTDOWN_LIMIT 100
136
137 struct _input_signal_events {
138 int ri_up;
139 int ri_down;
140 int dsr_up;
141 int dsr_down;
142 int dcd_up;
143 int dcd_down;
144 int cts_up;
145 int cts_down;
146 };
147
148 /*
149 * Device instance data structure
150 */
151 typedef struct _synclinkmp_info {
152 void *if_ptr; /* General purpose pointer (used by SPPP) */
153 int magic;
154 int flags;
155 int count; /* count of opens */
156 int line;
157 unsigned short close_delay;
158 unsigned short closing_wait; /* time to wait before closing */
159
160 struct mgsl_icount icount;
161
162 struct tty_struct *tty;
163 int timeout;
164 int x_char; /* xon/xoff character */
165 int blocked_open; /* # of blocked opens */
166 u16 read_status_mask1; /* break detection (SR1 indications) */
167 u16 read_status_mask2; /* parity/framing/overun (SR2 indications) */
168 unsigned char ignore_status_mask1; /* break detection (SR1 indications) */
169 unsigned char ignore_status_mask2; /* parity/framing/overun (SR2 indications) */
170 unsigned char *tx_buf;
171 int tx_put;
172 int tx_get;
173 int tx_count;
174
175 wait_queue_head_t open_wait;
176 wait_queue_head_t close_wait;
177
178 wait_queue_head_t status_event_wait_q;
179 wait_queue_head_t event_wait_q;
180 struct timer_list tx_timer; /* HDLC transmit timeout timer */
181 struct _synclinkmp_info *next_device; /* device list link */
182 struct timer_list status_timer; /* input signal status check timer */
183
184 spinlock_t lock; /* spinlock for synchronizing with ISR */
185 struct work_struct task; /* task structure for scheduling bh */
186
187 u32 max_frame_size; /* as set by device config */
188
189 u32 pending_bh;
190
191 bool bh_running; /* Protection from multiple */
192 int isr_overflow;
193 bool bh_requested;
194
195 int dcd_chkcount; /* check counts to prevent */
196 int cts_chkcount; /* too many IRQs if a signal */
197 int dsr_chkcount; /* is floating */
198 int ri_chkcount;
199
200 char *buffer_list; /* virtual address of Rx & Tx buffer lists */
201 unsigned long buffer_list_phys;
202
203 unsigned int rx_buf_count; /* count of total allocated Rx buffers */
204 SCADESC *rx_buf_list; /* list of receive buffer entries */
205 SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
206 unsigned int current_rx_buf;
207
208 unsigned int tx_buf_count; /* count of total allocated Tx buffers */
209 SCADESC *tx_buf_list; /* list of transmit buffer entries */
210 SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
211 unsigned int last_tx_buf;
212
213 unsigned char *tmp_rx_buf;
214 unsigned int tmp_rx_buf_count;
215
216 bool rx_enabled;
217 bool rx_overflow;
218
219 bool tx_enabled;
220 bool tx_active;
221 u32 idle_mode;
222
223 unsigned char ie0_value;
224 unsigned char ie1_value;
225 unsigned char ie2_value;
226 unsigned char ctrlreg_value;
227 unsigned char old_signals;
228
229 char device_name[25]; /* device instance name */
230
231 int port_count;
232 int adapter_num;
233 int port_num;
234
235 struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
236
237 unsigned int bus_type; /* expansion bus type (ISA,EISA,PCI) */
238
239 unsigned int irq_level; /* interrupt level */
240 unsigned long irq_flags;
241 bool irq_requested; /* true if IRQ requested */
242
243 MGSL_PARAMS params; /* communications parameters */
244
245 unsigned char serial_signals; /* current serial signal states */
246
247 bool irq_occurred; /* for diagnostics use */
248 unsigned int init_error; /* Initialization startup error */
249
250 u32 last_mem_alloc;
251 unsigned char* memory_base; /* shared memory address (PCI only) */
252 u32 phys_memory_base;
253 int shared_mem_requested;
254
255 unsigned char* sca_base; /* HD64570 SCA Memory address */
256 u32 phys_sca_base;
257 u32 sca_offset;
258 bool sca_base_requested;
259
260 unsigned char* lcr_base; /* local config registers (PCI only) */
261 u32 phys_lcr_base;
262 u32 lcr_offset;
263 int lcr_mem_requested;
264
265 unsigned char* statctrl_base; /* status/control register memory */
266 u32 phys_statctrl_base;
267 u32 statctrl_offset;
268 bool sca_statctrl_requested;
269
270 u32 misc_ctrl_value;
271 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
272 char char_buf[MAX_ASYNC_BUFFER_SIZE];
273 bool drop_rts_on_tx_done;
274
275 struct _input_signal_events input_signal_events;
276
277 /* SPPP/Cisco HDLC device parts */
278 int netcount;
279 int dosyncppp;
280 spinlock_t netlock;
281
282 #if SYNCLINK_GENERIC_HDLC
283 struct net_device *netdev;
284 #endif
285
286 } SLMP_INFO;
287
288 #define MGSL_MAGIC 0x5401
289
290 /*
291 * define serial signal status change macros
292 */
293 #define MISCSTATUS_DCD_LATCHED (SerialSignal_DCD<<8) /* indicates change in DCD */
294 #define MISCSTATUS_RI_LATCHED (SerialSignal_RI<<8) /* indicates change in RI */
295 #define MISCSTATUS_CTS_LATCHED (SerialSignal_CTS<<8) /* indicates change in CTS */
296 #define MISCSTATUS_DSR_LATCHED (SerialSignal_DSR<<8) /* change in DSR */
297
298 /* Common Register macros */
299 #define LPR 0x00
300 #define PABR0 0x02
301 #define PABR1 0x03
302 #define WCRL 0x04
303 #define WCRM 0x05
304 #define WCRH 0x06
305 #define DPCR 0x08
306 #define DMER 0x09
307 #define ISR0 0x10
308 #define ISR1 0x11
309 #define ISR2 0x12
310 #define IER0 0x14
311 #define IER1 0x15
312 #define IER2 0x16
313 #define ITCR 0x18
314 #define INTVR 0x1a
315 #define IMVR 0x1c
316
317 /* MSCI Register macros */
318 #define TRB 0x20
319 #define TRBL 0x20
320 #define TRBH 0x21
321 #define SR0 0x22
322 #define SR1 0x23
323 #define SR2 0x24
324 #define SR3 0x25
325 #define FST 0x26
326 #define IE0 0x28
327 #define IE1 0x29
328 #define IE2 0x2a
329 #define FIE 0x2b
330 #define CMD 0x2c
331 #define MD0 0x2e
332 #define MD1 0x2f
333 #define MD2 0x30
334 #define CTL 0x31
335 #define SA0 0x32
336 #define SA1 0x33
337 #define IDL 0x34
338 #define TMC 0x35
339 #define RXS 0x36
340 #define TXS 0x37
341 #define TRC0 0x38
342 #define TRC1 0x39
343 #define RRC 0x3a
344 #define CST0 0x3c
345 #define CST1 0x3d
346
347 /* Timer Register Macros */
348 #define TCNT 0x60
349 #define TCNTL 0x60
350 #define TCNTH 0x61
351 #define TCONR 0x62
352 #define TCONRL 0x62
353 #define TCONRH 0x63
354 #define TMCS 0x64
355 #define TEPR 0x65
356
357 /* DMA Controller Register macros */
358 #define DARL 0x80
359 #define DARH 0x81
360 #define DARB 0x82
361 #define BAR 0x80
362 #define BARL 0x80
363 #define BARH 0x81
364 #define BARB 0x82
365 #define SAR 0x84
366 #define SARL 0x84
367 #define SARH 0x85
368 #define SARB 0x86
369 #define CPB 0x86
370 #define CDA 0x88
371 #define CDAL 0x88
372 #define CDAH 0x89
373 #define EDA 0x8a
374 #define EDAL 0x8a
375 #define EDAH 0x8b
376 #define BFL 0x8c
377 #define BFLL 0x8c
378 #define BFLH 0x8d
379 #define BCR 0x8e
380 #define BCRL 0x8e
381 #define BCRH 0x8f
382 #define DSR 0x90
383 #define DMR 0x91
384 #define FCT 0x93
385 #define DIR 0x94
386 #define DCMD 0x95
387
388 /* combine with timer or DMA register address */
389 #define TIMER0 0x00
390 #define TIMER1 0x08
391 #define TIMER2 0x10
392 #define TIMER3 0x18
393 #define RXDMA 0x00
394 #define TXDMA 0x20
395
396 /* SCA Command Codes */
397 #define NOOP 0x00
398 #define TXRESET 0x01
399 #define TXENABLE 0x02
400 #define TXDISABLE 0x03
401 #define TXCRCINIT 0x04
402 #define TXCRCEXCL 0x05
403 #define TXEOM 0x06
404 #define TXABORT 0x07
405 #define MPON 0x08
406 #define TXBUFCLR 0x09
407 #define RXRESET 0x11
408 #define RXENABLE 0x12
409 #define RXDISABLE 0x13
410 #define RXCRCINIT 0x14
411 #define RXREJECT 0x15
412 #define SEARCHMP 0x16
413 #define RXCRCEXCL 0x17
414 #define RXCRCCALC 0x18
415 #define CHRESET 0x21
416 #define HUNT 0x31
417
418 /* DMA command codes */
419 #define SWABORT 0x01
420 #define FEICLEAR 0x02
421
422 /* IE0 */
423 #define TXINTE BIT7
424 #define RXINTE BIT6
425 #define TXRDYE BIT1
426 #define RXRDYE BIT0
427
428 /* IE1 & SR1 */
429 #define UDRN BIT7
430 #define IDLE BIT6
431 #define SYNCD BIT4
432 #define FLGD BIT4
433 #define CCTS BIT3
434 #define CDCD BIT2
435 #define BRKD BIT1
436 #define ABTD BIT1
437 #define GAPD BIT1
438 #define BRKE BIT0
439 #define IDLD BIT0
440
441 /* IE2 & SR2 */
442 #define EOM BIT7
443 #define PMP BIT6
444 #define SHRT BIT6
445 #define PE BIT5
446 #define ABT BIT5
447 #define FRME BIT4
448 #define RBIT BIT4
449 #define OVRN BIT3
450 #define CRCE BIT2
451
452
453 /*
454 * Global linked list of SyncLink devices
455 */
456 static SLMP_INFO *synclinkmp_device_list = NULL;
457 static int synclinkmp_adapter_count = -1;
458 static int synclinkmp_device_count = 0;
459
460 /*
461 * Set this param to non-zero to load eax with the
462 * .text section address and breakpoint on module load.
463 * This is useful for use with gdb and add-symbol-file command.
464 */
465 static int break_on_load=0;
466
467 /*
468 * Driver major number, defaults to zero to get auto
469 * assigned major number. May be forced as module parameter.
470 */
471 static int ttymajor=0;
472
473 /*
474 * Array of user specified options for ISA adapters.
475 */
476 static int debug_level = 0;
477 static int maxframe[MAX_DEVICES] = {0,};
478 static int dosyncppp[MAX_DEVICES] = {0,};
479
480 module_param(break_on_load, bool, 0);
481 module_param(ttymajor, int, 0);
482 module_param(debug_level, int, 0);
483 module_param_array(maxframe, int, NULL, 0);
484 module_param_array(dosyncppp, int, NULL, 0);
485
486 static char *driver_name = "SyncLink MultiPort driver";
487 static char *driver_version = "$Revision: 4.38 $";
488
489 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
490 static void synclinkmp_remove_one(struct pci_dev *dev);
491
492 static struct pci_device_id synclinkmp_pci_tbl[] = {
493 { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
494 { 0, }, /* terminate list */
495 };
496 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
497
498 MODULE_LICENSE("GPL");
499
500 static struct pci_driver synclinkmp_pci_driver = {
501 .name = "synclinkmp",
502 .id_table = synclinkmp_pci_tbl,
503 .probe = synclinkmp_init_one,
504 .remove = __devexit_p(synclinkmp_remove_one),
505 };
506
507
508 static struct tty_driver *serial_driver;
509
510 /* number of characters left in xmit buffer before we ask for more */
511 #define WAKEUP_CHARS 256
512
513
514 /* tty callbacks */
515
516 static int open(struct tty_struct *tty, struct file * filp);
517 static void close(struct tty_struct *tty, struct file * filp);
518 static void hangup(struct tty_struct *tty);
519 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
520
521 static int write(struct tty_struct *tty, const unsigned char *buf, int count);
522 static int put_char(struct tty_struct *tty, unsigned char ch);
523 static void send_xchar(struct tty_struct *tty, char ch);
524 static void wait_until_sent(struct tty_struct *tty, int timeout);
525 static int write_room(struct tty_struct *tty);
526 static void flush_chars(struct tty_struct *tty);
527 static void flush_buffer(struct tty_struct *tty);
528 static void tx_hold(struct tty_struct *tty);
529 static void tx_release(struct tty_struct *tty);
530
531 static int ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
532 static int read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
533 static int chars_in_buffer(struct tty_struct *tty);
534 static void throttle(struct tty_struct * tty);
535 static void unthrottle(struct tty_struct * tty);
536 static void set_break(struct tty_struct *tty, int break_state);
537
538 #if SYNCLINK_GENERIC_HDLC
539 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
540 static void hdlcdev_tx_done(SLMP_INFO *info);
541 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
542 static int hdlcdev_init(SLMP_INFO *info);
543 static void hdlcdev_exit(SLMP_INFO *info);
544 #endif
545
546 /* ioctl handlers */
547
548 static int get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
549 static int get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
550 static int set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
551 static int get_txidle(SLMP_INFO *info, int __user *idle_mode);
552 static int set_txidle(SLMP_INFO *info, int idle_mode);
553 static int tx_enable(SLMP_INFO *info, int enable);
554 static int tx_abort(SLMP_INFO *info);
555 static int rx_enable(SLMP_INFO *info, int enable);
556 static int modem_input_wait(SLMP_INFO *info,int arg);
557 static int wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
558 static int tiocmget(struct tty_struct *tty, struct file *file);
559 static int tiocmset(struct tty_struct *tty, struct file *file,
560 unsigned int set, unsigned int clear);
561 static void set_break(struct tty_struct *tty, int break_state);
562
563 static void add_device(SLMP_INFO *info);
564 static void device_init(int adapter_num, struct pci_dev *pdev);
565 static int claim_resources(SLMP_INFO *info);
566 static void release_resources(SLMP_INFO *info);
567
568 static int startup(SLMP_INFO *info);
569 static int block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
570 static void shutdown(SLMP_INFO *info);
571 static void program_hw(SLMP_INFO *info);
572 static void change_params(SLMP_INFO *info);
573
574 static bool init_adapter(SLMP_INFO *info);
575 static bool register_test(SLMP_INFO *info);
576 static bool irq_test(SLMP_INFO *info);
577 static bool loopback_test(SLMP_INFO *info);
578 static int adapter_test(SLMP_INFO *info);
579 static bool memory_test(SLMP_INFO *info);
580
581 static void reset_adapter(SLMP_INFO *info);
582 static void reset_port(SLMP_INFO *info);
583 static void async_mode(SLMP_INFO *info);
584 static void hdlc_mode(SLMP_INFO *info);
585
586 static void rx_stop(SLMP_INFO *info);
587 static void rx_start(SLMP_INFO *info);
588 static void rx_reset_buffers(SLMP_INFO *info);
589 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
590 static bool rx_get_frame(SLMP_INFO *info);
591
592 static void tx_start(SLMP_INFO *info);
593 static void tx_stop(SLMP_INFO *info);
594 static void tx_load_fifo(SLMP_INFO *info);
595 static void tx_set_idle(SLMP_INFO *info);
596 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
597
598 static void get_signals(SLMP_INFO *info);
599 static void set_signals(SLMP_INFO *info);
600 static void enable_loopback(SLMP_INFO *info, int enable);
601 static void set_rate(SLMP_INFO *info, u32 data_rate);
602
603 static int bh_action(SLMP_INFO *info);
604 static void bh_handler(struct work_struct *work);
605 static void bh_receive(SLMP_INFO *info);
606 static void bh_transmit(SLMP_INFO *info);
607 static void bh_status(SLMP_INFO *info);
608 static void isr_timer(SLMP_INFO *info);
609 static void isr_rxint(SLMP_INFO *info);
610 static void isr_rxrdy(SLMP_INFO *info);
611 static void isr_txint(SLMP_INFO *info);
612 static void isr_txrdy(SLMP_INFO *info);
613 static void isr_rxdmaok(SLMP_INFO *info);
614 static void isr_rxdmaerror(SLMP_INFO *info);
615 static void isr_txdmaok(SLMP_INFO *info);
616 static void isr_txdmaerror(SLMP_INFO *info);
617 static void isr_io_pin(SLMP_INFO *info, u16 status);
618
619 static int alloc_dma_bufs(SLMP_INFO *info);
620 static void free_dma_bufs(SLMP_INFO *info);
621 static int alloc_buf_list(SLMP_INFO *info);
622 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
623 static int alloc_tmp_rx_buf(SLMP_INFO *info);
624 static void free_tmp_rx_buf(SLMP_INFO *info);
625
626 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
627 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
628 static void tx_timeout(unsigned long context);
629 static void status_timeout(unsigned long context);
630
631 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
632 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
633 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
634 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
635 static unsigned char read_status_reg(SLMP_INFO * info);
636 static void write_control_reg(SLMP_INFO * info);
637
638
639 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
640 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
641 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
642
643 static u32 misc_ctrl_value = 0x007e4040;
644 static u32 lcr1_brdr_value = 0x00800028;
645
646 static u32 read_ahead_count = 8;
647
648 /* DPCR, DMA Priority Control
649 *
650 * 07..05 Not used, must be 0
651 * 04 BRC, bus release condition: 0=all transfers complete
652 * 1=release after 1 xfer on all channels
653 * 03 CCC, channel change condition: 0=every cycle
654 * 1=after each channel completes all xfers
655 * 02..00 PR<2..0>, priority 100=round robin
656 *
657 * 00000100 = 0x00
658 */
659 static unsigned char dma_priority = 0x04;
660
661 // Number of bytes that can be written to shared RAM
662 // in a single write operation
663 static u32 sca_pci_load_interval = 64;
664
665 /*
666 * 1st function defined in .text section. Calling this function in
667 * init_module() followed by a breakpoint allows a remote debugger
668 * (gdb) to get the .text address for the add-symbol-file command.
669 * This allows remote debugging of dynamically loadable modules.
670 */
671 static void* synclinkmp_get_text_ptr(void);
672 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
673
674 static inline int sanity_check(SLMP_INFO *info,
675 char *name, const char *routine)
676 {
677 #ifdef SANITY_CHECK
678 static const char *badmagic =
679 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
680 static const char *badinfo =
681 "Warning: null synclinkmp_struct for (%s) in %s\n";
682
683 if (!info) {
684 printk(badinfo, name, routine);
685 return 1;
686 }
687 if (info->magic != MGSL_MAGIC) {
688 printk(badmagic, name, routine);
689 return 1;
690 }
691 #else
692 if (!info)
693 return 1;
694 #endif
695 return 0;
696 }
697
698 /**
699 * line discipline callback wrappers
700 *
701 * The wrappers maintain line discipline references
702 * while calling into the line discipline.
703 *
704 * ldisc_receive_buf - pass receive data to line discipline
705 */
706
707 static void ldisc_receive_buf(struct tty_struct *tty,
708 const __u8 *data, char *flags, int count)
709 {
710 struct tty_ldisc *ld;
711 if (!tty)
712 return;
713 ld = tty_ldisc_ref(tty);
714 if (ld) {
715 if (ld->receive_buf)
716 ld->receive_buf(tty, data, flags, count);
717 tty_ldisc_deref(ld);
718 }
719 }
720
721 /* tty callbacks */
722
723 /* Called when a port is opened. Init and enable port.
724 */
725 static int open(struct tty_struct *tty, struct file *filp)
726 {
727 SLMP_INFO *info;
728 int retval, line;
729 unsigned long flags;
730
731 line = tty->index;
732 if ((line < 0) || (line >= synclinkmp_device_count)) {
733 printk("%s(%d): open with invalid line #%d.\n",
734 __FILE__,__LINE__,line);
735 return -ENODEV;
736 }
737
738 info = synclinkmp_device_list;
739 while(info && info->line != line)
740 info = info->next_device;
741 if (sanity_check(info, tty->name, "open"))
742 return -ENODEV;
743 if ( info->init_error ) {
744 printk("%s(%d):%s device is not allocated, init error=%d\n",
745 __FILE__,__LINE__,info->device_name,info->init_error);
746 return -ENODEV;
747 }
748
749 tty->driver_data = info;
750 info->tty = tty;
751
752 if (debug_level >= DEBUG_LEVEL_INFO)
753 printk("%s(%d):%s open(), old ref count = %d\n",
754 __FILE__,__LINE__,tty->driver->name, info->count);
755
756 /* If port is closing, signal caller to try again */
757 if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
758 if (info->flags & ASYNC_CLOSING)
759 interruptible_sleep_on(&info->close_wait);
760 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
761 -EAGAIN : -ERESTARTSYS);
762 goto cleanup;
763 }
764
765 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
766
767 spin_lock_irqsave(&info->netlock, flags);
768 if (info->netcount) {
769 retval = -EBUSY;
770 spin_unlock_irqrestore(&info->netlock, flags);
771 goto cleanup;
772 }
773 info->count++;
774 spin_unlock_irqrestore(&info->netlock, flags);
775
776 if (info->count == 1) {
777 /* 1st open on this device, init hardware */
778 retval = startup(info);
779 if (retval < 0)
780 goto cleanup;
781 }
782
783 retval = block_til_ready(tty, filp, info);
784 if (retval) {
785 if (debug_level >= DEBUG_LEVEL_INFO)
786 printk("%s(%d):%s block_til_ready() returned %d\n",
787 __FILE__,__LINE__, info->device_name, retval);
788 goto cleanup;
789 }
790
791 if (debug_level >= DEBUG_LEVEL_INFO)
792 printk("%s(%d):%s open() success\n",
793 __FILE__,__LINE__, info->device_name);
794 retval = 0;
795
796 cleanup:
797 if (retval) {
798 if (tty->count == 1)
799 info->tty = NULL; /* tty layer will release tty struct */
800 if(info->count)
801 info->count--;
802 }
803
804 return retval;
805 }
806
807 /* Called when port is closed. Wait for remaining data to be
808 * sent. Disable port and free resources.
809 */
810 static void close(struct tty_struct *tty, struct file *filp)
811 {
812 SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
813
814 if (sanity_check(info, tty->name, "close"))
815 return;
816
817 if (debug_level >= DEBUG_LEVEL_INFO)
818 printk("%s(%d):%s close() entry, count=%d\n",
819 __FILE__,__LINE__, info->device_name, info->count);
820
821 if (!info->count)
822 return;
823
824 if (tty_hung_up_p(filp))
825 goto cleanup;
826
827 if ((tty->count == 1) && (info->count != 1)) {
828 /*
829 * tty->count is 1 and the tty structure will be freed.
830 * info->count should be one in this case.
831 * if it's not, correct it so that the port is shutdown.
832 */
833 printk("%s(%d):%s close: bad refcount; tty->count is 1, "
834 "info->count is %d\n",
835 __FILE__,__LINE__, info->device_name, info->count);
836 info->count = 1;
837 }
838
839 info->count--;
840
841 /* if at least one open remaining, leave hardware active */
842 if (info->count)
843 goto cleanup;
844
845 info->flags |= ASYNC_CLOSING;
846
847 /* set tty->closing to notify line discipline to
848 * only process XON/XOFF characters. Only the N_TTY
849 * discipline appears to use this (ppp does not).
850 */
851 tty->closing = 1;
852
853 /* wait for transmit data to clear all layers */
854
855 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
856 if (debug_level >= DEBUG_LEVEL_INFO)
857 printk("%s(%d):%s close() calling tty_wait_until_sent\n",
858 __FILE__,__LINE__, info->device_name );
859 tty_wait_until_sent(tty, info->closing_wait);
860 }
861
862 if (info->flags & ASYNC_INITIALIZED)
863 wait_until_sent(tty, info->timeout);
864
865 flush_buffer(tty);
866
867 tty_ldisc_flush(tty);
868
869 shutdown(info);
870
871 tty->closing = 0;
872 info->tty = NULL;
873
874 if (info->blocked_open) {
875 if (info->close_delay) {
876 msleep_interruptible(jiffies_to_msecs(info->close_delay));
877 }
878 wake_up_interruptible(&info->open_wait);
879 }
880
881 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
882
883 wake_up_interruptible(&info->close_wait);
884
885 cleanup:
886 if (debug_level >= DEBUG_LEVEL_INFO)
887 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
888 tty->driver->name, info->count);
889 }
890
891 /* Called by tty_hangup() when a hangup is signaled.
892 * This is the same as closing all open descriptors for the port.
893 */
894 static void hangup(struct tty_struct *tty)
895 {
896 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
897
898 if (debug_level >= DEBUG_LEVEL_INFO)
899 printk("%s(%d):%s hangup()\n",
900 __FILE__,__LINE__, info->device_name );
901
902 if (sanity_check(info, tty->name, "hangup"))
903 return;
904
905 flush_buffer(tty);
906 shutdown(info);
907
908 info->count = 0;
909 info->flags &= ~ASYNC_NORMAL_ACTIVE;
910 info->tty = NULL;
911
912 wake_up_interruptible(&info->open_wait);
913 }
914
915 /* Set new termios settings
916 */
917 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
918 {
919 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
920 unsigned long flags;
921
922 if (debug_level >= DEBUG_LEVEL_INFO)
923 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
924 tty->driver->name );
925
926 change_params(info);
927
928 /* Handle transition to B0 status */
929 if (old_termios->c_cflag & CBAUD &&
930 !(tty->termios->c_cflag & CBAUD)) {
931 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
932 spin_lock_irqsave(&info->lock,flags);
933 set_signals(info);
934 spin_unlock_irqrestore(&info->lock,flags);
935 }
936
937 /* Handle transition away from B0 status */
938 if (!(old_termios->c_cflag & CBAUD) &&
939 tty->termios->c_cflag & CBAUD) {
940 info->serial_signals |= SerialSignal_DTR;
941 if (!(tty->termios->c_cflag & CRTSCTS) ||
942 !test_bit(TTY_THROTTLED, &tty->flags)) {
943 info->serial_signals |= SerialSignal_RTS;
944 }
945 spin_lock_irqsave(&info->lock,flags);
946 set_signals(info);
947 spin_unlock_irqrestore(&info->lock,flags);
948 }
949
950 /* Handle turning off CRTSCTS */
951 if (old_termios->c_cflag & CRTSCTS &&
952 !(tty->termios->c_cflag & CRTSCTS)) {
953 tty->hw_stopped = 0;
954 tx_release(tty);
955 }
956 }
957
958 /* Send a block of data
959 *
960 * Arguments:
961 *
962 * tty pointer to tty information structure
963 * buf pointer to buffer containing send data
964 * count size of send data in bytes
965 *
966 * Return Value: number of characters written
967 */
968 static int write(struct tty_struct *tty,
969 const unsigned char *buf, int count)
970 {
971 int c, ret = 0;
972 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
973 unsigned long flags;
974
975 if (debug_level >= DEBUG_LEVEL_INFO)
976 printk("%s(%d):%s write() count=%d\n",
977 __FILE__,__LINE__,info->device_name,count);
978
979 if (sanity_check(info, tty->name, "write"))
980 goto cleanup;
981
982 if (!info->tx_buf)
983 goto cleanup;
984
985 if (info->params.mode == MGSL_MODE_HDLC) {
986 if (count > info->max_frame_size) {
987 ret = -EIO;
988 goto cleanup;
989 }
990 if (info->tx_active)
991 goto cleanup;
992 if (info->tx_count) {
993 /* send accumulated data from send_char() calls */
994 /* as frame and wait before accepting more data. */
995 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
996 goto start;
997 }
998 ret = info->tx_count = count;
999 tx_load_dma_buffer(info, buf, count);
1000 goto start;
1001 }
1002
1003 for (;;) {
1004 c = min_t(int, count,
1005 min(info->max_frame_size - info->tx_count - 1,
1006 info->max_frame_size - info->tx_put));
1007 if (c <= 0)
1008 break;
1009
1010 memcpy(info->tx_buf + info->tx_put, buf, c);
1011
1012 spin_lock_irqsave(&info->lock,flags);
1013 info->tx_put += c;
1014 if (info->tx_put >= info->max_frame_size)
1015 info->tx_put -= info->max_frame_size;
1016 info->tx_count += c;
1017 spin_unlock_irqrestore(&info->lock,flags);
1018
1019 buf += c;
1020 count -= c;
1021 ret += c;
1022 }
1023
1024 if (info->params.mode == MGSL_MODE_HDLC) {
1025 if (count) {
1026 ret = info->tx_count = 0;
1027 goto cleanup;
1028 }
1029 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
1030 }
1031 start:
1032 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1033 spin_lock_irqsave(&info->lock,flags);
1034 if (!info->tx_active)
1035 tx_start(info);
1036 spin_unlock_irqrestore(&info->lock,flags);
1037 }
1038
1039 cleanup:
1040 if (debug_level >= DEBUG_LEVEL_INFO)
1041 printk( "%s(%d):%s write() returning=%d\n",
1042 __FILE__,__LINE__,info->device_name,ret);
1043 return ret;
1044 }
1045
1046 /* Add a character to the transmit buffer.
1047 */
1048 static int put_char(struct tty_struct *tty, unsigned char ch)
1049 {
1050 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1051 unsigned long flags;
1052 int ret = 0;
1053
1054 if ( debug_level >= DEBUG_LEVEL_INFO ) {
1055 printk( "%s(%d):%s put_char(%d)\n",
1056 __FILE__,__LINE__,info->device_name,ch);
1057 }
1058
1059 if (sanity_check(info, tty->name, "put_char"))
1060 return 0;
1061
1062 if (!info->tx_buf)
1063 return 0;
1064
1065 spin_lock_irqsave(&info->lock,flags);
1066
1067 if ( (info->params.mode != MGSL_MODE_HDLC) ||
1068 !info->tx_active ) {
1069
1070 if (info->tx_count < info->max_frame_size - 1) {
1071 info->tx_buf[info->tx_put++] = ch;
1072 if (info->tx_put >= info->max_frame_size)
1073 info->tx_put -= info->max_frame_size;
1074 info->tx_count++;
1075 ret = 1;
1076 }
1077 }
1078
1079 spin_unlock_irqrestore(&info->lock,flags);
1080 return ret;
1081 }
1082
1083 /* Send a high-priority XON/XOFF character
1084 */
1085 static void send_xchar(struct tty_struct *tty, char ch)
1086 {
1087 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1088 unsigned long flags;
1089
1090 if (debug_level >= DEBUG_LEVEL_INFO)
1091 printk("%s(%d):%s send_xchar(%d)\n",
1092 __FILE__,__LINE__, info->device_name, ch );
1093
1094 if (sanity_check(info, tty->name, "send_xchar"))
1095 return;
1096
1097 info->x_char = ch;
1098 if (ch) {
1099 /* Make sure transmit interrupts are on */
1100 spin_lock_irqsave(&info->lock,flags);
1101 if (!info->tx_enabled)
1102 tx_start(info);
1103 spin_unlock_irqrestore(&info->lock,flags);
1104 }
1105 }
1106
1107 /* Wait until the transmitter is empty.
1108 */
1109 static void wait_until_sent(struct tty_struct *tty, int timeout)
1110 {
1111 SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1112 unsigned long orig_jiffies, char_time;
1113
1114 if (!info )
1115 return;
1116
1117 if (debug_level >= DEBUG_LEVEL_INFO)
1118 printk("%s(%d):%s wait_until_sent() entry\n",
1119 __FILE__,__LINE__, info->device_name );
1120
1121 if (sanity_check(info, tty->name, "wait_until_sent"))
1122 return;
1123
1124 lock_kernel();
1125
1126 if (!(info->flags & ASYNC_INITIALIZED))
1127 goto exit;
1128
1129 orig_jiffies = jiffies;
1130
1131 /* Set check interval to 1/5 of estimated time to
1132 * send a character, and make it at least 1. The check
1133 * interval should also be less than the timeout.
1134 * Note: use tight timings here to satisfy the NIST-PCTS.
1135 */
1136
1137 if ( info->params.data_rate ) {
1138 char_time = info->timeout/(32 * 5);
1139 if (!char_time)
1140 char_time++;
1141 } else
1142 char_time = 1;
1143
1144 if (timeout)
1145 char_time = min_t(unsigned long, char_time, timeout);
1146
1147 if ( info->params.mode == MGSL_MODE_HDLC ) {
1148 while (info->tx_active) {
1149 msleep_interruptible(jiffies_to_msecs(char_time));
1150 if (signal_pending(current))
1151 break;
1152 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1153 break;
1154 }
1155 } else {
1156 //TODO: determine if there is something similar to USC16C32
1157 // TXSTATUS_ALL_SENT status
1158 while ( info->tx_active && info->tx_enabled) {
1159 msleep_interruptible(jiffies_to_msecs(char_time));
1160 if (signal_pending(current))
1161 break;
1162 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1163 break;
1164 }
1165 }
1166
1167 exit:
1168 unlock_kernel();
1169 if (debug_level >= DEBUG_LEVEL_INFO)
1170 printk("%s(%d):%s wait_until_sent() exit\n",
1171 __FILE__,__LINE__, info->device_name );
1172 }
1173
1174 /* Return the count of free bytes in transmit buffer
1175 */
1176 static int write_room(struct tty_struct *tty)
1177 {
1178 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1179 int ret;
1180
1181 if (sanity_check(info, tty->name, "write_room"))
1182 return 0;
1183
1184 lock_kernel();
1185 if (info->params.mode == MGSL_MODE_HDLC) {
1186 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1187 } else {
1188 ret = info->max_frame_size - info->tx_count - 1;
1189 if (ret < 0)
1190 ret = 0;
1191 }
1192 unlock_kernel();
1193
1194 if (debug_level >= DEBUG_LEVEL_INFO)
1195 printk("%s(%d):%s write_room()=%d\n",
1196 __FILE__, __LINE__, info->device_name, ret);
1197
1198 return ret;
1199 }
1200
1201 /* enable transmitter and send remaining buffered characters
1202 */
1203 static void flush_chars(struct tty_struct *tty)
1204 {
1205 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1206 unsigned long flags;
1207
1208 if ( debug_level >= DEBUG_LEVEL_INFO )
1209 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1210 __FILE__,__LINE__,info->device_name,info->tx_count);
1211
1212 if (sanity_check(info, tty->name, "flush_chars"))
1213 return;
1214
1215 if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1216 !info->tx_buf)
1217 return;
1218
1219 if ( debug_level >= DEBUG_LEVEL_INFO )
1220 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1221 __FILE__,__LINE__,info->device_name );
1222
1223 spin_lock_irqsave(&info->lock,flags);
1224
1225 if (!info->tx_active) {
1226 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1227 info->tx_count ) {
1228 /* operating in synchronous (frame oriented) mode */
1229 /* copy data from circular tx_buf to */
1230 /* transmit DMA buffer. */
1231 tx_load_dma_buffer(info,
1232 info->tx_buf,info->tx_count);
1233 }
1234 tx_start(info);
1235 }
1236
1237 spin_unlock_irqrestore(&info->lock,flags);
1238 }
1239
1240 /* Discard all data in the send buffer
1241 */
1242 static void flush_buffer(struct tty_struct *tty)
1243 {
1244 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1245 unsigned long flags;
1246
1247 if (debug_level >= DEBUG_LEVEL_INFO)
1248 printk("%s(%d):%s flush_buffer() entry\n",
1249 __FILE__,__LINE__, info->device_name );
1250
1251 if (sanity_check(info, tty->name, "flush_buffer"))
1252 return;
1253
1254 spin_lock_irqsave(&info->lock,flags);
1255 info->tx_count = info->tx_put = info->tx_get = 0;
1256 del_timer(&info->tx_timer);
1257 spin_unlock_irqrestore(&info->lock,flags);
1258
1259 tty_wakeup(tty);
1260 }
1261
1262 /* throttle (stop) transmitter
1263 */
1264 static void tx_hold(struct tty_struct *tty)
1265 {
1266 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1267 unsigned long flags;
1268
1269 if (sanity_check(info, tty->name, "tx_hold"))
1270 return;
1271
1272 if ( debug_level >= DEBUG_LEVEL_INFO )
1273 printk("%s(%d):%s tx_hold()\n",
1274 __FILE__,__LINE__,info->device_name);
1275
1276 spin_lock_irqsave(&info->lock,flags);
1277 if (info->tx_enabled)
1278 tx_stop(info);
1279 spin_unlock_irqrestore(&info->lock,flags);
1280 }
1281
1282 /* release (start) transmitter
1283 */
1284 static void tx_release(struct tty_struct *tty)
1285 {
1286 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1287 unsigned long flags;
1288
1289 if (sanity_check(info, tty->name, "tx_release"))
1290 return;
1291
1292 if ( debug_level >= DEBUG_LEVEL_INFO )
1293 printk("%s(%d):%s tx_release()\n",
1294 __FILE__,__LINE__,info->device_name);
1295
1296 spin_lock_irqsave(&info->lock,flags);
1297 if (!info->tx_enabled)
1298 tx_start(info);
1299 spin_unlock_irqrestore(&info->lock,flags);
1300 }
1301
1302 /* Service an IOCTL request
1303 *
1304 * Arguments:
1305 *
1306 * tty pointer to tty instance data
1307 * file pointer to associated file object for device
1308 * cmd IOCTL command code
1309 * arg command argument/context
1310 *
1311 * Return Value: 0 if success, otherwise error code
1312 */
1313 static int do_ioctl(struct tty_struct *tty, struct file *file,
1314 unsigned int cmd, unsigned long arg)
1315 {
1316 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1317 int error;
1318 struct mgsl_icount cnow; /* kernel counter temps */
1319 struct serial_icounter_struct __user *p_cuser; /* user space */
1320 unsigned long flags;
1321 void __user *argp = (void __user *)arg;
1322
1323 if (debug_level >= DEBUG_LEVEL_INFO)
1324 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1325 info->device_name, cmd );
1326
1327 if (sanity_check(info, tty->name, "ioctl"))
1328 return -ENODEV;
1329
1330 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1331 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1332 if (tty->flags & (1 << TTY_IO_ERROR))
1333 return -EIO;
1334 }
1335
1336 switch (cmd) {
1337 case MGSL_IOCGPARAMS:
1338 return get_params(info, argp);
1339 case MGSL_IOCSPARAMS:
1340 return set_params(info, argp);
1341 case MGSL_IOCGTXIDLE:
1342 return get_txidle(info, argp);
1343 case MGSL_IOCSTXIDLE:
1344 return set_txidle(info, (int)arg);
1345 case MGSL_IOCTXENABLE:
1346 return tx_enable(info, (int)arg);
1347 case MGSL_IOCRXENABLE:
1348 return rx_enable(info, (int)arg);
1349 case MGSL_IOCTXABORT:
1350 return tx_abort(info);
1351 case MGSL_IOCGSTATS:
1352 return get_stats(info, argp);
1353 case MGSL_IOCWAITEVENT:
1354 return wait_mgsl_event(info, argp);
1355 case MGSL_IOCLOOPTXDONE:
1356 return 0; // TODO: Not supported, need to document
1357 /* Wait for modem input (DCD,RI,DSR,CTS) change
1358 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1359 */
1360 case TIOCMIWAIT:
1361 return modem_input_wait(info,(int)arg);
1362
1363 /*
1364 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1365 * Return: write counters to the user passed counter struct
1366 * NB: both 1->0 and 0->1 transitions are counted except for
1367 * RI where only 0->1 is counted.
1368 */
1369 case TIOCGICOUNT:
1370 spin_lock_irqsave(&info->lock,flags);
1371 cnow = info->icount;
1372 spin_unlock_irqrestore(&info->lock,flags);
1373 p_cuser = argp;
1374 PUT_USER(error,cnow.cts, &p_cuser->cts);
1375 if (error) return error;
1376 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
1377 if (error) return error;
1378 PUT_USER(error,cnow.rng, &p_cuser->rng);
1379 if (error) return error;
1380 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
1381 if (error) return error;
1382 PUT_USER(error,cnow.rx, &p_cuser->rx);
1383 if (error) return error;
1384 PUT_USER(error,cnow.tx, &p_cuser->tx);
1385 if (error) return error;
1386 PUT_USER(error,cnow.frame, &p_cuser->frame);
1387 if (error) return error;
1388 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
1389 if (error) return error;
1390 PUT_USER(error,cnow.parity, &p_cuser->parity);
1391 if (error) return error;
1392 PUT_USER(error,cnow.brk, &p_cuser->brk);
1393 if (error) return error;
1394 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
1395 if (error) return error;
1396 return 0;
1397 default:
1398 return -ENOIOCTLCMD;
1399 }
1400 return 0;
1401 }
1402
1403 static int ioctl(struct tty_struct *tty, struct file *file,
1404 unsigned int cmd, unsigned long arg)
1405 {
1406 int ret;
1407 lock_kernel();
1408 ret = do_ioctl(tty, file, cmd, arg);
1409 unlock_kernel();
1410 return ret;
1411 }
1412
1413 /*
1414 * /proc fs routines....
1415 */
1416
1417 static inline int line_info(char *buf, SLMP_INFO *info)
1418 {
1419 char stat_buf[30];
1420 int ret;
1421 unsigned long flags;
1422
1423 ret = sprintf(buf, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1424 "\tIRQ=%d MaxFrameSize=%u\n",
1425 info->device_name,
1426 info->phys_sca_base,
1427 info->phys_memory_base,
1428 info->phys_statctrl_base,
1429 info->phys_lcr_base,
1430 info->irq_level,
1431 info->max_frame_size );
1432
1433 /* output current serial signal states */
1434 spin_lock_irqsave(&info->lock,flags);
1435 get_signals(info);
1436 spin_unlock_irqrestore(&info->lock,flags);
1437
1438 stat_buf[0] = 0;
1439 stat_buf[1] = 0;
1440 if (info->serial_signals & SerialSignal_RTS)
1441 strcat(stat_buf, "|RTS");
1442 if (info->serial_signals & SerialSignal_CTS)
1443 strcat(stat_buf, "|CTS");
1444 if (info->serial_signals & SerialSignal_DTR)
1445 strcat(stat_buf, "|DTR");
1446 if (info->serial_signals & SerialSignal_DSR)
1447 strcat(stat_buf, "|DSR");
1448 if (info->serial_signals & SerialSignal_DCD)
1449 strcat(stat_buf, "|CD");
1450 if (info->serial_signals & SerialSignal_RI)
1451 strcat(stat_buf, "|RI");
1452
1453 if (info->params.mode == MGSL_MODE_HDLC) {
1454 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1455 info->icount.txok, info->icount.rxok);
1456 if (info->icount.txunder)
1457 ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1458 if (info->icount.txabort)
1459 ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1460 if (info->icount.rxshort)
1461 ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1462 if (info->icount.rxlong)
1463 ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1464 if (info->icount.rxover)
1465 ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1466 if (info->icount.rxcrc)
1467 ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxcrc);
1468 } else {
1469 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1470 info->icount.tx, info->icount.rx);
1471 if (info->icount.frame)
1472 ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1473 if (info->icount.parity)
1474 ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1475 if (info->icount.brk)
1476 ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1477 if (info->icount.overrun)
1478 ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1479 }
1480
1481 /* Append serial signal status to end */
1482 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1483
1484 ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1485 info->tx_active,info->bh_requested,info->bh_running,
1486 info->pending_bh);
1487
1488 return ret;
1489 }
1490
1491 /* Called to print information about devices
1492 */
1493 static int read_proc(char *page, char **start, off_t off, int count,
1494 int *eof, void *data)
1495 {
1496 int len = 0, l;
1497 off_t begin = 0;
1498 SLMP_INFO *info;
1499
1500 len += sprintf(page, "synclinkmp driver:%s\n", driver_version);
1501
1502 info = synclinkmp_device_list;
1503 while( info ) {
1504 l = line_info(page + len, info);
1505 len += l;
1506 if (len+begin > off+count)
1507 goto done;
1508 if (len+begin < off) {
1509 begin += len;
1510 len = 0;
1511 }
1512 info = info->next_device;
1513 }
1514
1515 *eof = 1;
1516 done:
1517 if (off >= len+begin)
1518 return 0;
1519 *start = page + (off-begin);
1520 return ((count < begin+len-off) ? count : begin+len-off);
1521 }
1522
1523 /* Return the count of bytes in transmit buffer
1524 */
1525 static int chars_in_buffer(struct tty_struct *tty)
1526 {
1527 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1528
1529 if (sanity_check(info, tty->name, "chars_in_buffer"))
1530 return 0;
1531
1532 if (debug_level >= DEBUG_LEVEL_INFO)
1533 printk("%s(%d):%s chars_in_buffer()=%d\n",
1534 __FILE__, __LINE__, info->device_name, info->tx_count);
1535
1536 return info->tx_count;
1537 }
1538
1539 /* Signal remote device to throttle send data (our receive data)
1540 */
1541 static void throttle(struct tty_struct * tty)
1542 {
1543 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1544 unsigned long flags;
1545
1546 if (debug_level >= DEBUG_LEVEL_INFO)
1547 printk("%s(%d):%s throttle() entry\n",
1548 __FILE__,__LINE__, info->device_name );
1549
1550 if (sanity_check(info, tty->name, "throttle"))
1551 return;
1552
1553 if (I_IXOFF(tty))
1554 send_xchar(tty, STOP_CHAR(tty));
1555
1556 if (tty->termios->c_cflag & CRTSCTS) {
1557 spin_lock_irqsave(&info->lock,flags);
1558 info->serial_signals &= ~SerialSignal_RTS;
1559 set_signals(info);
1560 spin_unlock_irqrestore(&info->lock,flags);
1561 }
1562 }
1563
1564 /* Signal remote device to stop throttling send data (our receive data)
1565 */
1566 static void unthrottle(struct tty_struct * tty)
1567 {
1568 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1569 unsigned long flags;
1570
1571 if (debug_level >= DEBUG_LEVEL_INFO)
1572 printk("%s(%d):%s unthrottle() entry\n",
1573 __FILE__,__LINE__, info->device_name );
1574
1575 if (sanity_check(info, tty->name, "unthrottle"))
1576 return;
1577
1578 if (I_IXOFF(tty)) {
1579 if (info->x_char)
1580 info->x_char = 0;
1581 else
1582 send_xchar(tty, START_CHAR(tty));
1583 }
1584
1585 if (tty->termios->c_cflag & CRTSCTS) {
1586 spin_lock_irqsave(&info->lock,flags);
1587 info->serial_signals |= SerialSignal_RTS;
1588 set_signals(info);
1589 spin_unlock_irqrestore(&info->lock,flags);
1590 }
1591 }
1592
1593 /* set or clear transmit break condition
1594 * break_state -1=set break condition, 0=clear
1595 */
1596 static void set_break(struct tty_struct *tty, int break_state)
1597 {
1598 unsigned char RegValue;
1599 SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1600 unsigned long flags;
1601
1602 if (debug_level >= DEBUG_LEVEL_INFO)
1603 printk("%s(%d):%s set_break(%d)\n",
1604 __FILE__,__LINE__, info->device_name, break_state);
1605
1606 if (sanity_check(info, tty->name, "set_break"))
1607 return;
1608
1609 spin_lock_irqsave(&info->lock,flags);
1610 RegValue = read_reg(info, CTL);
1611 if (break_state == -1)
1612 RegValue |= BIT3;
1613 else
1614 RegValue &= ~BIT3;
1615 write_reg(info, CTL, RegValue);
1616 spin_unlock_irqrestore(&info->lock,flags);
1617 }
1618
1619 #if SYNCLINK_GENERIC_HDLC
1620
1621 /**
1622 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1623 * set encoding and frame check sequence (FCS) options
1624 *
1625 * dev pointer to network device structure
1626 * encoding serial encoding setting
1627 * parity FCS setting
1628 *
1629 * returns 0 if success, otherwise error code
1630 */
1631 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1632 unsigned short parity)
1633 {
1634 SLMP_INFO *info = dev_to_port(dev);
1635 unsigned char new_encoding;
1636 unsigned short new_crctype;
1637
1638 /* return error if TTY interface open */
1639 if (info->count)
1640 return -EBUSY;
1641
1642 switch (encoding)
1643 {
1644 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1645 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1646 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1647 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1648 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1649 default: return -EINVAL;
1650 }
1651
1652 switch (parity)
1653 {
1654 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1655 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1656 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1657 default: return -EINVAL;
1658 }
1659
1660 info->params.encoding = new_encoding;
1661 info->params.crc_type = new_crctype;
1662
1663 /* if network interface up, reprogram hardware */
1664 if (info->netcount)
1665 program_hw(info);
1666
1667 return 0;
1668 }
1669
1670 /**
1671 * called by generic HDLC layer to send frame
1672 *
1673 * skb socket buffer containing HDLC frame
1674 * dev pointer to network device structure
1675 *
1676 * returns 0 if success, otherwise error code
1677 */
1678 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1679 {
1680 SLMP_INFO *info = dev_to_port(dev);
1681 struct net_device_stats *stats = hdlc_stats(dev);
1682 unsigned long flags;
1683
1684 if (debug_level >= DEBUG_LEVEL_INFO)
1685 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1686
1687 /* stop sending until this frame completes */
1688 netif_stop_queue(dev);
1689
1690 /* copy data to device buffers */
1691 info->tx_count = skb->len;
1692 tx_load_dma_buffer(info, skb->data, skb->len);
1693
1694 /* update network statistics */
1695 stats->tx_packets++;
1696 stats->tx_bytes += skb->len;
1697
1698 /* done with socket buffer, so free it */
1699 dev_kfree_skb(skb);
1700
1701 /* save start time for transmit timeout detection */
1702 dev->trans_start = jiffies;
1703
1704 /* start hardware transmitter if necessary */
1705 spin_lock_irqsave(&info->lock,flags);
1706 if (!info->tx_active)
1707 tx_start(info);
1708 spin_unlock_irqrestore(&info->lock,flags);
1709
1710 return 0;
1711 }
1712
1713 /**
1714 * called by network layer when interface enabled
1715 * claim resources and initialize hardware
1716 *
1717 * dev pointer to network device structure
1718 *
1719 * returns 0 if success, otherwise error code
1720 */
1721 static int hdlcdev_open(struct net_device *dev)
1722 {
1723 SLMP_INFO *info = dev_to_port(dev);
1724 int rc;
1725 unsigned long flags;
1726
1727 if (debug_level >= DEBUG_LEVEL_INFO)
1728 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1729
1730 /* generic HDLC layer open processing */
1731 if ((rc = hdlc_open(dev)))
1732 return rc;
1733
1734 /* arbitrate between network and tty opens */
1735 spin_lock_irqsave(&info->netlock, flags);
1736 if (info->count != 0 || info->netcount != 0) {
1737 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1738 spin_unlock_irqrestore(&info->netlock, flags);
1739 return -EBUSY;
1740 }
1741 info->netcount=1;
1742 spin_unlock_irqrestore(&info->netlock, flags);
1743
1744 /* claim resources and init adapter */
1745 if ((rc = startup(info)) != 0) {
1746 spin_lock_irqsave(&info->netlock, flags);
1747 info->netcount=0;
1748 spin_unlock_irqrestore(&info->netlock, flags);
1749 return rc;
1750 }
1751
1752 /* assert DTR and RTS, apply hardware settings */
1753 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1754 program_hw(info);
1755
1756 /* enable network layer transmit */
1757 dev->trans_start = jiffies;
1758 netif_start_queue(dev);
1759
1760 /* inform generic HDLC layer of current DCD status */
1761 spin_lock_irqsave(&info->lock, flags);
1762 get_signals(info);
1763 spin_unlock_irqrestore(&info->lock, flags);
1764 if (info->serial_signals & SerialSignal_DCD)
1765 netif_carrier_on(dev);
1766 else
1767 netif_carrier_off(dev);
1768 return 0;
1769 }
1770
1771 /**
1772 * called by network layer when interface is disabled
1773 * shutdown hardware and release resources
1774 *
1775 * dev pointer to network device structure
1776 *
1777 * returns 0 if success, otherwise error code
1778 */
1779 static int hdlcdev_close(struct net_device *dev)
1780 {
1781 SLMP_INFO *info = dev_to_port(dev);
1782 unsigned long flags;
1783
1784 if (debug_level >= DEBUG_LEVEL_INFO)
1785 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1786
1787 netif_stop_queue(dev);
1788
1789 /* shutdown adapter and release resources */
1790 shutdown(info);
1791
1792 hdlc_close(dev);
1793
1794 spin_lock_irqsave(&info->netlock, flags);
1795 info->netcount=0;
1796 spin_unlock_irqrestore(&info->netlock, flags);
1797
1798 return 0;
1799 }
1800
1801 /**
1802 * called by network layer to process IOCTL call to network device
1803 *
1804 * dev pointer to network device structure
1805 * ifr pointer to network interface request structure
1806 * cmd IOCTL command code
1807 *
1808 * returns 0 if success, otherwise error code
1809 */
1810 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1811 {
1812 const size_t size = sizeof(sync_serial_settings);
1813 sync_serial_settings new_line;
1814 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1815 SLMP_INFO *info = dev_to_port(dev);
1816 unsigned int flags;
1817
1818 if (debug_level >= DEBUG_LEVEL_INFO)
1819 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1820
1821 /* return error if TTY interface open */
1822 if (info->count)
1823 return -EBUSY;
1824
1825 if (cmd != SIOCWANDEV)
1826 return hdlc_ioctl(dev, ifr, cmd);
1827
1828 switch(ifr->ifr_settings.type) {
1829 case IF_GET_IFACE: /* return current sync_serial_settings */
1830
1831 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1832 if (ifr->ifr_settings.size < size) {
1833 ifr->ifr_settings.size = size; /* data size wanted */
1834 return -ENOBUFS;
1835 }
1836
1837 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1838 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1839 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1840 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1841
1842 switch (flags){
1843 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1844 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1845 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1846 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1847 default: new_line.clock_type = CLOCK_DEFAULT;
1848 }
1849
1850 new_line.clock_rate = info->params.clock_speed;
1851 new_line.loopback = info->params.loopback ? 1:0;
1852
1853 if (copy_to_user(line, &new_line, size))
1854 return -EFAULT;
1855 return 0;
1856
1857 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1858
1859 if(!capable(CAP_NET_ADMIN))
1860 return -EPERM;
1861 if (copy_from_user(&new_line, line, size))
1862 return -EFAULT;
1863
1864 switch (new_line.clock_type)
1865 {
1866 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1867 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1868 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1869 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1870 case CLOCK_DEFAULT: flags = info->params.flags &
1871 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1872 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1873 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1874 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1875 default: return -EINVAL;
1876 }
1877
1878 if (new_line.loopback != 0 && new_line.loopback != 1)
1879 return -EINVAL;
1880
1881 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1882 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1883 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1884 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1885 info->params.flags |= flags;
1886
1887 info->params.loopback = new_line.loopback;
1888
1889 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1890 info->params.clock_speed = new_line.clock_rate;
1891 else
1892 info->params.clock_speed = 0;
1893
1894 /* if network interface up, reprogram hardware */
1895 if (info->netcount)
1896 program_hw(info);
1897 return 0;
1898
1899 default:
1900 return hdlc_ioctl(dev, ifr, cmd);
1901 }
1902 }
1903
1904 /**
1905 * called by network layer when transmit timeout is detected
1906 *
1907 * dev pointer to network device structure
1908 */
1909 static void hdlcdev_tx_timeout(struct net_device *dev)
1910 {
1911 SLMP_INFO *info = dev_to_port(dev);
1912 struct net_device_stats *stats = hdlc_stats(dev);
1913 unsigned long flags;
1914
1915 if (debug_level >= DEBUG_LEVEL_INFO)
1916 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1917
1918 stats->tx_errors++;
1919 stats->tx_aborted_errors++;
1920
1921 spin_lock_irqsave(&info->lock,flags);
1922 tx_stop(info);
1923 spin_unlock_irqrestore(&info->lock,flags);
1924
1925 netif_wake_queue(dev);
1926 }
1927
1928 /**
1929 * called by device driver when transmit completes
1930 * reenable network layer transmit if stopped
1931 *
1932 * info pointer to device instance information
1933 */
1934 static void hdlcdev_tx_done(SLMP_INFO *info)
1935 {
1936 if (netif_queue_stopped(info->netdev))
1937 netif_wake_queue(info->netdev);
1938 }
1939
1940 /**
1941 * called by device driver when frame received
1942 * pass frame to network layer
1943 *
1944 * info pointer to device instance information
1945 * buf pointer to buffer contianing frame data
1946 * size count of data bytes in buf
1947 */
1948 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1949 {
1950 struct sk_buff *skb = dev_alloc_skb(size);
1951 struct net_device *dev = info->netdev;
1952 struct net_device_stats *stats = hdlc_stats(dev);
1953
1954 if (debug_level >= DEBUG_LEVEL_INFO)
1955 printk("hdlcdev_rx(%s)\n",dev->name);
1956
1957 if (skb == NULL) {
1958 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
1959 stats->rx_dropped++;
1960 return;
1961 }
1962
1963 memcpy(skb_put(skb, size),buf,size);
1964
1965 skb->protocol = hdlc_type_trans(skb, info->netdev);
1966
1967 stats->rx_packets++;
1968 stats->rx_bytes += size;
1969
1970 netif_rx(skb);
1971
1972 info->netdev->last_rx = jiffies;
1973 }
1974
1975 /**
1976 * called by device driver when adding device instance
1977 * do generic HDLC initialization
1978 *
1979 * info pointer to device instance information
1980 *
1981 * returns 0 if success, otherwise error code
1982 */
1983 static int hdlcdev_init(SLMP_INFO *info)
1984 {
1985 int rc;
1986 struct net_device *dev;
1987 hdlc_device *hdlc;
1988
1989 /* allocate and initialize network and HDLC layer objects */
1990
1991 if (!(dev = alloc_hdlcdev(info))) {
1992 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1993 return -ENOMEM;
1994 }
1995
1996 /* for network layer reporting purposes only */
1997 dev->mem_start = info->phys_sca_base;
1998 dev->mem_end = info->phys_sca_base + SCA_BASE_SIZE - 1;
1999 dev->irq = info->irq_level;
2000
2001 /* network layer callbacks and settings */
2002 dev->do_ioctl = hdlcdev_ioctl;
2003 dev->open = hdlcdev_open;
2004 dev->stop = hdlcdev_close;
2005 dev->tx_timeout = hdlcdev_tx_timeout;
2006 dev->watchdog_timeo = 10*HZ;
2007 dev->tx_queue_len = 50;
2008
2009 /* generic HDLC layer callbacks and settings */
2010 hdlc = dev_to_hdlc(dev);
2011 hdlc->attach = hdlcdev_attach;
2012 hdlc->xmit = hdlcdev_xmit;
2013
2014 /* register objects with HDLC layer */
2015 if ((rc = register_hdlc_device(dev))) {
2016 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
2017 free_netdev(dev);
2018 return rc;
2019 }
2020
2021 info->netdev = dev;
2022 return 0;
2023 }
2024
2025 /**
2026 * called by device driver when removing device instance
2027 * do generic HDLC cleanup
2028 *
2029 * info pointer to device instance information
2030 */
2031 static void hdlcdev_exit(SLMP_INFO *info)
2032 {
2033 unregister_hdlc_device(info->netdev);
2034 free_netdev(info->netdev);
2035 info->netdev = NULL;
2036 }
2037
2038 #endif /* CONFIG_HDLC */
2039
2040
2041 /* Return next bottom half action to perform.
2042 * Return Value: BH action code or 0 if nothing to do.
2043 */
2044 static int bh_action(SLMP_INFO *info)
2045 {
2046 unsigned long flags;
2047 int rc = 0;
2048
2049 spin_lock_irqsave(&info->lock,flags);
2050
2051 if (info->pending_bh & BH_RECEIVE) {
2052 info->pending_bh &= ~BH_RECEIVE;
2053 rc = BH_RECEIVE;
2054 } else if (info->pending_bh & BH_TRANSMIT) {
2055 info->pending_bh &= ~BH_TRANSMIT;
2056 rc = BH_TRANSMIT;
2057 } else if (info->pending_bh & BH_STATUS) {
2058 info->pending_bh &= ~BH_STATUS;
2059 rc = BH_STATUS;
2060 }
2061
2062 if (!rc) {
2063 /* Mark BH routine as complete */
2064 info->bh_running = false;
2065 info->bh_requested = false;
2066 }
2067
2068 spin_unlock_irqrestore(&info->lock,flags);
2069
2070 return rc;
2071 }
2072
2073 /* Perform bottom half processing of work items queued by ISR.
2074 */
2075 static void bh_handler(struct work_struct *work)
2076 {
2077 SLMP_INFO *info = container_of(work, SLMP_INFO, task);
2078 int action;
2079
2080 if (!info)
2081 return;
2082
2083 if ( debug_level >= DEBUG_LEVEL_BH )
2084 printk( "%s(%d):%s bh_handler() entry\n",
2085 __FILE__,__LINE__,info->device_name);
2086
2087 info->bh_running = true;
2088
2089 while((action = bh_action(info)) != 0) {
2090
2091 /* Process work item */
2092 if ( debug_level >= DEBUG_LEVEL_BH )
2093 printk( "%s(%d):%s bh_handler() work item action=%d\n",
2094 __FILE__,__LINE__,info->device_name, action);
2095
2096 switch (action) {
2097
2098 case BH_RECEIVE:
2099 bh_receive(info);
2100 break;
2101 case BH_TRANSMIT:
2102 bh_transmit(info);
2103 break;
2104 case BH_STATUS:
2105 bh_status(info);
2106 break;
2107 default:
2108 /* unknown work item ID */
2109 printk("%s(%d):%s Unknown work item ID=%08X!\n",
2110 __FILE__,__LINE__,info->device_name,action);
2111 break;
2112 }
2113 }
2114
2115 if ( debug_level >= DEBUG_LEVEL_BH )
2116 printk( "%s(%d):%s bh_handler() exit\n",
2117 __FILE__,__LINE__,info->device_name);
2118 }
2119
2120 static void bh_receive(SLMP_INFO *info)
2121 {
2122 if ( debug_level >= DEBUG_LEVEL_BH )
2123 printk( "%s(%d):%s bh_receive()\n",
2124 __FILE__,__LINE__,info->device_name);
2125
2126 while( rx_get_frame(info) );
2127 }
2128
2129 static void bh_transmit(SLMP_INFO *info)
2130 {
2131 struct tty_struct *tty = info->tty;
2132
2133 if ( debug_level >= DEBUG_LEVEL_BH )
2134 printk( "%s(%d):%s bh_transmit() entry\n",
2135 __FILE__,__LINE__,info->device_name);
2136
2137 if (tty)
2138 tty_wakeup(tty);
2139 }
2140
2141 static void bh_status(SLMP_INFO *info)
2142 {
2143 if ( debug_level >= DEBUG_LEVEL_BH )
2144 printk( "%s(%d):%s bh_status() entry\n",
2145 __FILE__,__LINE__,info->device_name);
2146
2147 info->ri_chkcount = 0;
2148 info->dsr_chkcount = 0;
2149 info->dcd_chkcount = 0;
2150 info->cts_chkcount = 0;
2151 }
2152
2153 static void isr_timer(SLMP_INFO * info)
2154 {
2155 unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2156
2157 /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2158 write_reg(info, IER2, 0);
2159
2160 /* TMCS, Timer Control/Status Register
2161 *
2162 * 07 CMF, Compare match flag (read only) 1=match
2163 * 06 ECMI, CMF Interrupt Enable: 0=disabled
2164 * 05 Reserved, must be 0
2165 * 04 TME, Timer Enable
2166 * 03..00 Reserved, must be 0
2167 *
2168 * 0000 0000
2169 */
2170 write_reg(info, (unsigned char)(timer + TMCS), 0);
2171
2172 info->irq_occurred = true;
2173
2174 if ( debug_level >= DEBUG_LEVEL_ISR )
2175 printk("%s(%d):%s isr_timer()\n",
2176 __FILE__,__LINE__,info->device_name);
2177 }
2178
2179 static void isr_rxint(SLMP_INFO * info)
2180 {
2181 struct tty_struct *tty = info->tty;
2182 struct mgsl_icount *icount = &info->icount;
2183 unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2184 unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2185
2186 /* clear status bits */
2187 if (status)
2188 write_reg(info, SR1, status);
2189
2190 if (status2)
2191 write_reg(info, SR2, status2);
2192
2193 if ( debug_level >= DEBUG_LEVEL_ISR )
2194 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2195 __FILE__,__LINE__,info->device_name,status,status2);
2196
2197 if (info->params.mode == MGSL_MODE_ASYNC) {
2198 if (status & BRKD) {
2199 icount->brk++;
2200
2201 /* process break detection if tty control
2202 * is not set to ignore it
2203 */
2204 if ( tty ) {
2205 if (!(status & info->ignore_status_mask1)) {
2206 if (info->read_status_mask1 & BRKD) {
2207 tty_insert_flip_char(tty, 0, TTY_BREAK);
2208 if (info->flags & ASYNC_SAK)
2209 do_SAK(tty);
2210 }
2211 }
2212 }
2213 }
2214 }
2215 else {
2216 if (status & (FLGD|IDLD)) {
2217 if (status & FLGD)
2218 info->icount.exithunt++;
2219 else if (status & IDLD)
2220 info->icount.rxidle++;
2221 wake_up_interruptible(&info->event_wait_q);
2222 }
2223 }
2224
2225 if (status & CDCD) {
2226 /* simulate a common modem status change interrupt
2227 * for our handler
2228 */
2229 get_signals( info );
2230 isr_io_pin(info,
2231 MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2232 }
2233 }
2234
2235 /*
2236 * handle async rx data interrupts
2237 */
2238 static void isr_rxrdy(SLMP_INFO * info)
2239 {
2240 u16 status;
2241 unsigned char DataByte;
2242 struct tty_struct *tty = info->tty;
2243 struct mgsl_icount *icount = &info->icount;
2244
2245 if ( debug_level >= DEBUG_LEVEL_ISR )
2246 printk("%s(%d):%s isr_rxrdy\n",
2247 __FILE__,__LINE__,info->device_name);
2248
2249 while((status = read_reg(info,CST0)) & BIT0)
2250 {
2251 int flag = 0;
2252 bool over = false;
2253 DataByte = read_reg(info,TRB);
2254
2255 icount->rx++;
2256
2257 if ( status & (PE + FRME + OVRN) ) {
2258 printk("%s(%d):%s rxerr=%04X\n",
2259 __FILE__,__LINE__,info->device_name,status);
2260
2261 /* update error statistics */
2262 if (status & PE)
2263 icount->parity++;
2264 else if (status & FRME)
2265 icount->frame++;
2266 else if (status & OVRN)
2267 icount->overrun++;
2268
2269 /* discard char if tty control flags say so */
2270 if (status & info->ignore_status_mask2)
2271 continue;
2272
2273 status &= info->read_status_mask2;
2274
2275 if ( tty ) {
2276 if (status & PE)
2277 flag = TTY_PARITY;
2278 else if (status & FRME)
2279 flag = TTY_FRAME;
2280 if (status & OVRN) {
2281 /* Overrun is special, since it's
2282 * reported immediately, and doesn't
2283 * affect the current character
2284 */
2285 over = true;
2286 }
2287 }
2288 } /* end of if (error) */
2289
2290 if ( tty ) {
2291 tty_insert_flip_char(tty, DataByte, flag);
2292 if (over)
2293 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
2294 }
2295 }
2296
2297 if ( debug_level >= DEBUG_LEVEL_ISR ) {
2298 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2299 __FILE__,__LINE__,info->device_name,
2300 icount->rx,icount->brk,icount->parity,
2301 icount->frame,icount->overrun);
2302 }
2303
2304 if ( tty )
2305 tty_flip_buffer_push(tty);
2306 }
2307
2308 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2309 {
2310 if ( debug_level >= DEBUG_LEVEL_ISR )
2311 printk("%s(%d):%s isr_txeom status=%02x\n",
2312 __FILE__,__LINE__,info->device_name,status);
2313
2314 write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2315 write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2316 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2317
2318 if (status & UDRN) {
2319 write_reg(info, CMD, TXRESET);
2320 write_reg(info, CMD, TXENABLE);
2321 } else
2322 write_reg(info, CMD, TXBUFCLR);
2323
2324 /* disable and clear tx interrupts */
2325 info->ie0_value &= ~TXRDYE;
2326 info->ie1_value &= ~(IDLE + UDRN);
2327 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2328 write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2329
2330 if ( info->tx_active ) {
2331 if (info->params.mode != MGSL_MODE_ASYNC) {
2332 if (status & UDRN)
2333 info->icount.txunder++;
2334 else if (status & IDLE)
2335 info->icount.txok++;
2336 }
2337
2338 info->tx_active = false;
2339 info->tx_count = info->tx_put = info->tx_get = 0;
2340
2341 del_timer(&info->tx_timer);
2342
2343 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2344 info->serial_signals &= ~SerialSignal_RTS;
2345 info->drop_rts_on_tx_done = false;
2346 set_signals(info);
2347 }
2348
2349 #if SYNCLINK_GENERIC_HDLC
2350 if (info->netcount)
2351 hdlcdev_tx_done(info);
2352 else
2353 #endif
2354 {
2355 if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2356 tx_stop(info);
2357 return;
2358 }
2359 info->pending_bh |= BH_TRANSMIT;
2360 }
2361 }
2362 }
2363
2364
2365 /*
2366 * handle tx status interrupts
2367 */
2368 static void isr_txint(SLMP_INFO * info)
2369 {
2370 unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2371
2372 /* clear status bits */
2373 write_reg(info, SR1, status);
2374
2375 if ( debug_level >= DEBUG_LEVEL_ISR )
2376 printk("%s(%d):%s isr_txint status=%02x\n",
2377 __FILE__,__LINE__,info->device_name,status);
2378
2379 if (status & (UDRN + IDLE))
2380 isr_txeom(info, status);
2381
2382 if (status & CCTS) {
2383 /* simulate a common modem status change interrupt
2384 * for our handler
2385 */
2386 get_signals( info );
2387 isr_io_pin(info,
2388 MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2389
2390 }
2391 }
2392
2393 /*
2394 * handle async tx data interrupts
2395 */
2396 static void isr_txrdy(SLMP_INFO * info)
2397 {
2398 if ( debug_level >= DEBUG_LEVEL_ISR )
2399 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2400 __FILE__,__LINE__,info->device_name,info->tx_count);
2401
2402 if (info->params.mode != MGSL_MODE_ASYNC) {
2403 /* disable TXRDY IRQ, enable IDLE IRQ */
2404 info->ie0_value &= ~TXRDYE;
2405 info->ie1_value |= IDLE;
2406 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2407 return;
2408 }
2409
2410 if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2411 tx_stop(info);
2412 return;
2413 }
2414
2415 if ( info->tx_count )
2416 tx_load_fifo( info );
2417 else {
2418 info->tx_active = false;
2419 info->ie0_value &= ~TXRDYE;
2420 write_reg(info, IE0, info->ie0_value);
2421 }
2422
2423 if (info->tx_count < WAKEUP_CHARS)
2424 info->pending_bh |= BH_TRANSMIT;
2425 }
2426
2427 static void isr_rxdmaok(SLMP_INFO * info)
2428 {
2429 /* BIT7 = EOT (end of transfer)
2430 * BIT6 = EOM (end of message/frame)
2431 */
2432 unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2433
2434 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2435 write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2436
2437 if ( debug_level >= DEBUG_LEVEL_ISR )
2438 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2439 __FILE__,__LINE__,info->device_name,status);
2440
2441 info->pending_bh |= BH_RECEIVE;
2442 }
2443
2444 static void isr_rxdmaerror(SLMP_INFO * info)
2445 {
2446 /* BIT5 = BOF (buffer overflow)
2447 * BIT4 = COF (counter overflow)
2448 */
2449 unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2450
2451 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2452 write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2453
2454 if ( debug_level >= DEBUG_LEVEL_ISR )
2455 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2456 __FILE__,__LINE__,info->device_name,status);
2457
2458 info->rx_overflow = true;
2459 info->pending_bh |= BH_RECEIVE;
2460 }
2461
2462 static void isr_txdmaok(SLMP_INFO * info)
2463 {
2464 unsigned char status_reg1 = read_reg(info, SR1);
2465
2466 write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2467 write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2468 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2469
2470 if ( debug_level >= DEBUG_LEVEL_ISR )
2471 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2472 __FILE__,__LINE__,info->device_name,status_reg1);
2473
2474 /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2475 write_reg16(info, TRC0, 0);
2476 info->ie0_value |= TXRDYE;
2477 write_reg(info, IE0, info->ie0_value);
2478 }
2479
2480 static void isr_txdmaerror(SLMP_INFO * info)
2481 {
2482 /* BIT5 = BOF (buffer overflow)
2483 * BIT4 = COF (counter overflow)
2484 */
2485 unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2486
2487 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2488 write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2489
2490 if ( debug_level >= DEBUG_LEVEL_ISR )
2491 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2492 __FILE__,__LINE__,info->device_name,status);
2493 }
2494
2495 /* handle input serial signal changes
2496 */
2497 static void isr_io_pin( SLMP_INFO *info, u16 status )
2498 {
2499 struct mgsl_icount *icount;
2500
2501 if ( debug_level >= DEBUG_LEVEL_ISR )
2502 printk("%s(%d):isr_io_pin status=%04X\n",
2503 __FILE__,__LINE__,status);
2504
2505 if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2506 MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2507 icount = &info->icount;
2508 /* update input line counters */
2509 if (status & MISCSTATUS_RI_LATCHED) {
2510 icount->rng++;
2511 if ( status & SerialSignal_RI )
2512 info->input_signal_events.ri_up++;
2513 else
2514 info->input_signal_events.ri_down++;
2515 }
2516 if (status & MISCSTATUS_DSR_LATCHED) {
2517 icount->dsr++;
2518 if ( status & SerialSignal_DSR )
2519 info->input_signal_events.dsr_up++;
2520 else
2521 info->input_signal_events.dsr_down++;
2522 }
2523 if (status & MISCSTATUS_DCD_LATCHED) {
2524 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2525 info->ie1_value &= ~CDCD;
2526 write_reg(info, IE1, info->ie1_value);
2527 }
2528 icount->dcd++;
2529 if (status & SerialSignal_DCD) {
2530 info->input_signal_events.dcd_up++;
2531 } else
2532 info->input_signal_events.dcd_down++;
2533 #if SYNCLINK_GENERIC_HDLC
2534 if (info->netcount) {
2535 if (status & SerialSignal_DCD)
2536 netif_carrier_on(info->netdev);
2537 else
2538 netif_carrier_off(info->netdev);
2539 }
2540 #endif
2541 }
2542 if (status & MISCSTATUS_CTS_LATCHED)
2543 {
2544 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2545 info->ie1_value &= ~CCTS;
2546 write_reg(info, IE1, info->ie1_value);
2547 }
2548 icount->cts++;
2549 if ( status & SerialSignal_CTS )
2550 info->input_signal_events.cts_up++;
2551 else
2552 info->input_signal_events.cts_down++;
2553 }
2554 wake_up_interruptible(&info->status_event_wait_q);
2555 wake_up_interruptible(&info->event_wait_q);
2556
2557 if ( (info->flags & ASYNC_CHECK_CD) &&
2558 (status & MISCSTATUS_DCD_LATCHED) ) {
2559 if ( debug_level >= DEBUG_LEVEL_ISR )
2560 printk("%s CD now %s...", info->device_name,
2561 (status & SerialSignal_DCD) ? "on" : "off");
2562 if (status & SerialSignal_DCD)
2563 wake_up_interruptible(&info->open_wait);
2564 else {
2565 if ( debug_level >= DEBUG_LEVEL_ISR )
2566 printk("doing serial hangup...");
2567 if (info->tty)
2568 tty_hangup(info->tty);
2569 }
2570 }
2571
2572 if ( (info->flags & ASYNC_CTS_FLOW) &&
2573 (status & MISCSTATUS_CTS_LATCHED) ) {
2574 if ( info->tty ) {
2575 if (info->tty->hw_stopped) {
2576 if (status & SerialSignal_CTS) {
2577 if ( debug_level >= DEBUG_LEVEL_ISR )
2578 printk("CTS tx start...");
2579 info->tty->hw_stopped = 0;
2580 tx_start(info);
2581 info->pending_bh |= BH_TRANSMIT;
2582 return;
2583 }
2584 } else {
2585 if (!(status & SerialSignal_CTS)) {
2586 if ( debug_level >= DEBUG_LEVEL_ISR )
2587 printk("CTS tx stop...");
2588 info->tty->hw_stopped = 1;
2589 tx_stop(info);
2590 }
2591 }
2592 }
2593 }
2594 }
2595
2596 info->pending_bh |= BH_STATUS;
2597 }
2598
2599 /* Interrupt service routine entry point.
2600 *
2601 * Arguments:
2602 * irq interrupt number that caused interrupt
2603 * dev_id device ID supplied during interrupt registration
2604 * regs interrupted processor context
2605 */
2606 static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
2607 {
2608 SLMP_INFO *info = dev_id;
2609 unsigned char status, status0, status1=0;
2610 unsigned char dmastatus, dmastatus0, dmastatus1=0;
2611 unsigned char timerstatus0, timerstatus1=0;
2612 unsigned char shift;
2613 unsigned int i;
2614 unsigned short tmp;
2615
2616 if ( debug_level >= DEBUG_LEVEL_ISR )
2617 printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
2618 __FILE__, __LINE__, info->irq_level);
2619
2620 spin_lock(&info->lock);
2621
2622 for(;;) {
2623
2624 /* get status for SCA0 (ports 0-1) */
2625 tmp = read_reg16(info, ISR0); /* get ISR0 and ISR1 in one read */
2626 status0 = (unsigned char)tmp;
2627 dmastatus0 = (unsigned char)(tmp>>8);
2628 timerstatus0 = read_reg(info, ISR2);
2629
2630 if ( debug_level >= DEBUG_LEVEL_ISR )
2631 printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2632 __FILE__, __LINE__, info->device_name,
2633 status0, dmastatus0, timerstatus0);
2634
2635 if (info->port_count == 4) {
2636 /* get status for SCA1 (ports 2-3) */
2637 tmp = read_reg16(info->port_array[2], ISR0);
2638 status1 = (unsigned char)tmp;
2639 dmastatus1 = (unsigned char)(tmp>>8);
2640 timerstatus1 = read_reg(info->port_array[2], ISR2);
2641
2642 if ( debug_level >= DEBUG_LEVEL_ISR )
2643 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2644 __FILE__,__LINE__,info->device_name,
2645 status1,dmastatus1,timerstatus1);
2646 }
2647
2648 if (!status0 && !dmastatus0 && !timerstatus0 &&
2649 !status1 && !dmastatus1 && !timerstatus1)
2650 break;
2651
2652 for(i=0; i < info->port_count ; i++) {
2653 if (info->port_array[i] == NULL)
2654 continue;
2655 if (i < 2) {
2656 status = status0;
2657 dmastatus = dmastatus0;
2658 } else {
2659 status = status1;
2660 dmastatus = dmastatus1;
2661 }
2662
2663 shift = i & 1 ? 4 :0;
2664
2665 if (status & BIT0 << shift)
2666 isr_rxrdy(info->port_array[i]);
2667 if (status & BIT1 << shift)
2668 isr_txrdy(info->port_array[i]);
2669 if (status & BIT2 << shift)
2670 isr_rxint(info->port_array[i]);
2671 if (status & BIT3 << shift)
2672 isr_txint(info->port_array[i]);
2673
2674 if (dmastatus & BIT0 << shift)
2675 isr_rxdmaerror(info->port_array[i]);
2676 if (dmastatus & BIT1 << shift)
2677 isr_rxdmaok(info->port_array[i]);
2678 if (dmastatus & BIT2 << shift)
2679 isr_txdmaerror(info->port_array[i]);
2680 if (dmastatus & BIT3 << shift)
2681 isr_txdmaok(info->port_array[i]);
2682 }
2683
2684 if (timerstatus0 & (BIT5 | BIT4))
2685 isr_timer(info->port_array[0]);
2686 if (timerstatus0 & (BIT7 | BIT6))
2687 isr_timer(info->port_array[1]);
2688 if (timerstatus1 & (BIT5 | BIT4))
2689 isr_timer(info->port_array[2]);
2690 if (timerstatus1 & (BIT7 | BIT6))
2691 isr_timer(info->port_array[3]);
2692 }
2693
2694 for(i=0; i < info->port_count ; i++) {
2695 SLMP_INFO * port = info->port_array[i];
2696
2697 /* Request bottom half processing if there's something
2698 * for it to do and the bh is not already running.
2699 *
2700 * Note: startup adapter diags require interrupts.
2701 * do not request bottom half processing if the
2702 * device is not open in a normal mode.
2703 */
2704 if ( port && (port->count || port->netcount) &&
2705 port->pending_bh && !port->bh_running &&
2706 !port->bh_requested ) {
2707 if ( debug_level >= DEBUG_LEVEL_ISR )
2708 printk("%s(%d):%s queueing bh task.\n",
2709 __FILE__,__LINE__,port->device_name);
2710 schedule_work(&port->task);
2711 port->bh_requested = true;
2712 }
2713 }
2714
2715 spin_unlock(&info->lock);
2716
2717 if ( debug_level >= DEBUG_LEVEL_ISR )
2718 printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
2719 __FILE__, __LINE__, info->irq_level);
2720 return IRQ_HANDLED;
2721 }
2722
2723 /* Initialize and start device.
2724 */
2725 static int startup(SLMP_INFO * info)
2726 {
2727 if ( debug_level >= DEBUG_LEVEL_INFO )
2728 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2729
2730 if (info->flags & ASYNC_INITIALIZED)
2731 return 0;
2732
2733 if (!info->tx_buf) {
2734 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2735 if (!info->tx_buf) {
2736 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2737 __FILE__,__LINE__,info->device_name);
2738 return -ENOMEM;
2739 }
2740 }
2741
2742 info->pending_bh = 0;
2743
2744 memset(&info->icount, 0, sizeof(info->icount));
2745
2746 /* program hardware for current parameters */
2747 reset_port(info);
2748
2749 change_params(info);
2750
2751 mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
2752
2753 if (info->tty)
2754 clear_bit(TTY_IO_ERROR, &info->tty->flags);
2755
2756 info->flags |= ASYNC_INITIALIZED;
2757
2758 return 0;
2759 }
2760
2761 /* Called by close() and hangup() to shutdown hardware
2762 */
2763 static void shutdown(SLMP_INFO * info)
2764 {
2765 unsigned long flags;
2766
2767 if (!(info->flags & ASYNC_INITIALIZED))
2768 return;
2769
2770 if (debug_level >= DEBUG_LEVEL_INFO)
2771 printk("%s(%d):%s synclinkmp_shutdown()\n",
2772 __FILE__,__LINE__, info->device_name );
2773
2774 /* clear status wait queue because status changes */
2775 /* can't happen after shutting down the hardware */
2776 wake_up_interruptible(&info->status_event_wait_q);
2777 wake_up_interruptible(&info->event_wait_q);
2778
2779 del_timer(&info->tx_timer);
2780 del_timer(&info->status_timer);
2781
2782 kfree(info->tx_buf);
2783 info->tx_buf = NULL;
2784
2785 spin_lock_irqsave(&info->lock,flags);
2786
2787 reset_port(info);
2788
2789 if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
2790 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2791 set_signals(info);
2792 }
2793
2794 spin_unlock_irqrestore(&info->lock,flags);
2795
2796 if (info->tty)
2797 set_bit(TTY_IO_ERROR, &info->tty->flags);
2798
2799 info->flags &= ~ASYNC_INITIALIZED;
2800 }
2801
2802 static void program_hw(SLMP_INFO *info)
2803 {
2804 unsigned long flags;
2805
2806 spin_lock_irqsave(&info->lock,flags);
2807
2808 rx_stop(info);
2809 tx_stop(info);
2810
2811 info->tx_count = info->tx_put = info->tx_get = 0;
2812
2813 if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2814 hdlc_mode(info);
2815 else
2816 async_mode(info);
2817
2818 set_signals(info);
2819
2820 info->dcd_chkcount = 0;
2821 info->cts_chkcount = 0;
2822 info->ri_chkcount = 0;
2823 info->dsr_chkcount = 0;
2824
2825 info->ie1_value |= (CDCD|CCTS);
2826 write_reg(info, IE1, info->ie1_value);
2827
2828 get_signals(info);
2829
2830 if (info->netcount || (info->tty && info->tty->termios->c_cflag & CREAD) )
2831 rx_start(info);
2832
2833 spin_unlock_irqrestore(&info->lock,flags);
2834 }
2835
2836 /* Reconfigure adapter based on new parameters
2837 */
2838 static void change_params(SLMP_INFO *info)
2839 {
2840 unsigned cflag;
2841 int bits_per_char;
2842
2843 if (!info->tty || !info->tty->termios)
2844 return;
2845
2846 if (debug_level >= DEBUG_LEVEL_INFO)
2847 printk("%s(%d):%s change_params()\n",
2848 __FILE__,__LINE__, info->device_name );
2849
2850 cflag = info->tty->termios->c_cflag;
2851
2852 /* if B0 rate (hangup) specified then negate DTR and RTS */
2853 /* otherwise assert DTR and RTS */
2854 if (cflag & CBAUD)
2855 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2856 else
2857 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2858
2859 /* byte size and parity */
2860
2861 switch (cflag & CSIZE) {
2862 case CS5: info->params.data_bits = 5; break;
2863 case CS6: info->params.data_bits = 6; break;
2864 case CS7: info->params.data_bits = 7; break;
2865 case CS8: info->params.data_bits = 8; break;
2866 /* Never happens, but GCC is too dumb to figure it out */
2867 default: info->params.data_bits = 7; break;
2868 }
2869
2870 if (cflag & CSTOPB)
2871 info->params.stop_bits = 2;
2872 else
2873 info->params.stop_bits = 1;
2874
2875 info->params.parity = ASYNC_PARITY_NONE;
2876 if (cflag & PARENB) {
2877 if (cflag & PARODD)
2878 info->params.parity = ASYNC_PARITY_ODD;
2879 else
2880 info->params.parity = ASYNC_PARITY_EVEN;
2881 #ifdef CMSPAR
2882 if (cflag & CMSPAR)
2883 info->params.parity = ASYNC_PARITY_SPACE;
2884 #endif
2885 }
2886
2887 /* calculate number of jiffies to transmit a full
2888 * FIFO (32 bytes) at specified data rate
2889 */
2890 bits_per_char = info->params.data_bits +
2891 info->params.stop_bits + 1;
2892
2893 /* if port data rate is set to 460800 or less then
2894 * allow tty settings to override, otherwise keep the
2895 * current data rate.
2896 */
2897 if (info->params.data_rate <= 460800) {
2898 info->params.data_rate = tty_get_baud_rate(info->tty);
2899 }
2900
2901 if ( info->params.data_rate ) {
2902 info->timeout = (32*HZ*bits_per_char) /
2903 info->params.data_rate;
2904 }
2905 info->timeout += HZ/50; /* Add .02 seconds of slop */
2906
2907 if (cflag & CRTSCTS)
2908 info->flags |= ASYNC_CTS_FLOW;
2909 else
2910 info->flags &= ~ASYNC_CTS_FLOW;
2911
2912 if (cflag & CLOCAL)
2913 info->flags &= ~ASYNC_CHECK_CD;
2914 else
2915 info->flags |= ASYNC_CHECK_CD;
2916
2917 /* process tty input control flags */
2918
2919 info->read_status_mask2 = OVRN;
2920 if (I_INPCK(info->tty))
2921 info->read_status_mask2 |= PE | FRME;
2922 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2923 info->read_status_mask1 |= BRKD;
2924 if (I_IGNPAR(info->tty))
2925 info->ignore_status_mask2 |= PE | FRME;
2926 if (I_IGNBRK(info->tty)) {
2927 info->ignore_status_mask1 |= BRKD;
2928 /* If ignoring parity and break indicators, ignore
2929 * overruns too. (For real raw support).
2930 */
2931 if (I_IGNPAR(info->tty))
2932 info->ignore_status_mask2 |= OVRN;
2933 }
2934
2935 program_hw(info);
2936 }
2937
2938 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2939 {
2940 int err;
2941
2942 if (debug_level >= DEBUG_LEVEL_INFO)
2943 printk("%s(%d):%s get_params()\n",
2944 __FILE__,__LINE__, info->device_name);
2945
2946 if (!user_icount) {
2947 memset(&info->icount, 0, sizeof(info->icount));
2948 } else {
2949 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2950 if (err)
2951 return -EFAULT;
2952 }
2953
2954 return 0;
2955 }
2956
2957 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2958 {
2959 int err;
2960 if (debug_level >= DEBUG_LEVEL_INFO)
2961 printk("%s(%d):%s get_params()\n",
2962 __FILE__,__LINE__, info->device_name);
2963
2964 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2965 if (err) {
2966 if ( debug_level >= DEBUG_LEVEL_INFO )
2967 printk( "%s(%d):%s get_params() user buffer copy failed\n",
2968 __FILE__,__LINE__,info->device_name);
2969 return -EFAULT;
2970 }
2971
2972 return 0;
2973 }
2974
2975 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2976 {
2977 unsigned long flags;
2978 MGSL_PARAMS tmp_params;
2979 int err;
2980
2981 if (debug_level >= DEBUG_LEVEL_INFO)
2982 printk("%s(%d):%s set_params\n",
2983 __FILE__,__LINE__,info->device_name );
2984 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2985 if (err) {
2986 if ( debug_level >= DEBUG_LEVEL_INFO )
2987 printk( "%s(%d):%s set_params() user buffer copy failed\n",
2988 __FILE__,__LINE__,info->device_name);
2989 return -EFAULT;
2990 }
2991
2992 spin_lock_irqsave(&info->lock,flags);
2993 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2994 spin_unlock_irqrestore(&info->lock,flags);
2995
2996 change_params(info);
2997
2998 return 0;
2999 }
3000
3001 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
3002 {
3003 int err;
3004
3005 if (debug_level >= DEBUG_LEVEL_INFO)
3006 printk("%s(%d):%s get_txidle()=%d\n",
3007 __FILE__,__LINE__, info->device_name, info->idle_mode);
3008
3009 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
3010 if (err) {
3011 if ( debug_level >= DEBUG_LEVEL_INFO )
3012 printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
3013 __FILE__,__LINE__,info->device_name);
3014 return -EFAULT;
3015 }
3016
3017 return 0;
3018 }
3019
3020 static int set_txidle(SLMP_INFO * info, int idle_mode)
3021 {
3022 unsigned long flags;
3023
3024 if (debug_level >= DEBUG_LEVEL_INFO)
3025 printk("%s(%d):%s set_txidle(%d)\n",
3026 __FILE__,__LINE__,info->device_name, idle_mode );
3027
3028 spin_lock_irqsave(&info->lock,flags);
3029 info->idle_mode = idle_mode;
3030 tx_set_idle( info );
3031 spin_unlock_irqrestore(&info->lock,flags);
3032 return 0;
3033 }
3034
3035 static int tx_enable(SLMP_INFO * info, int enable)
3036 {
3037 unsigned long flags;
3038
3039 if (debug_level >= DEBUG_LEVEL_INFO)
3040 printk("%s(%d):%s tx_enable(%d)\n",
3041 __FILE__,__LINE__,info->device_name, enable);
3042
3043 spin_lock_irqsave(&info->lock,flags);
3044 if ( enable ) {
3045 if ( !info->tx_enabled ) {
3046 tx_start(info);
3047 }
3048 } else {
3049 if ( info->tx_enabled )
3050 tx_stop(info);
3051 }
3052 spin_unlock_irqrestore(&info->lock,flags);
3053 return 0;
3054 }
3055
3056 /* abort send HDLC frame
3057 */
3058 static int tx_abort(SLMP_INFO * info)
3059 {
3060 unsigned long flags;
3061
3062 if (debug_level >= DEBUG_LEVEL_INFO)
3063 printk("%s(%d):%s tx_abort()\n",
3064 __FILE__,__LINE__,info->device_name);
3065
3066 spin_lock_irqsave(&info->lock,flags);
3067 if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
3068 info->ie1_value &= ~UDRN;
3069 info->ie1_value |= IDLE;
3070 write_reg(info, IE1, info->ie1_value); /* disable tx status interrupts */
3071 write_reg(info, SR1, (unsigned char)(IDLE + UDRN)); /* clear pending */
3072
3073 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
3074 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
3075
3076 write_reg(info, CMD, TXABORT);
3077 }
3078 spin_unlock_irqrestore(&info->lock,flags);
3079 return 0;
3080 }
3081
3082 static int rx_enable(SLMP_INFO * info, int enable)
3083 {
3084 unsigned long flags;
3085
3086 if (debug_level >= DEBUG_LEVEL_INFO)
3087 printk("%s(%d):%s rx_enable(%d)\n",
3088 __FILE__,__LINE__,info->device_name,enable);
3089
3090 spin_lock_irqsave(&info->lock,flags);
3091 if ( enable ) {
3092 if ( !info->rx_enabled )
3093 rx_start(info);
3094 } else {
3095 if ( info->rx_enabled )
3096 rx_stop(info);
3097 }
3098 spin_unlock_irqrestore(&info->lock,flags);
3099 return 0;
3100 }
3101
3102 /* wait for specified event to occur
3103 */
3104 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3105 {
3106 unsigned long flags;
3107 int s;
3108 int rc=0;
3109 struct mgsl_icount cprev, cnow;
3110 int events;
3111 int mask;
3112 struct _input_signal_events oldsigs, newsigs;
3113 DECLARE_WAITQUEUE(wait, current);
3114
3115 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3116 if (rc) {
3117 return -EFAULT;
3118 }
3119
3120 if (debug_level >= DEBUG_LEVEL_INFO)
3121 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3122 __FILE__,__LINE__,info->device_name,mask);
3123
3124 spin_lock_irqsave(&info->lock,flags);
3125
3126 /* return immediately if state matches requested events */
3127 get_signals(info);
3128 s = info->serial_signals;
3129
3130 events = mask &
3131 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3132 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3133 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3134 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3135 if (events) {
3136 spin_unlock_irqrestore(&info->lock,flags);
3137 goto exit;
3138 }
3139
3140 /* save current irq counts */
3141 cprev = info->icount;
3142 oldsigs = info->input_signal_events;
3143
3144 /* enable hunt and idle irqs if needed */
3145 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3146 unsigned char oldval = info->ie1_value;
3147 unsigned char newval = oldval +
3148 (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3149 (mask & MgslEvent_IdleReceived ? IDLD:0);
3150 if ( oldval != newval ) {
3151 info->ie1_value = newval;
3152 write_reg(info, IE1, info->ie1_value);
3153 }
3154 }
3155
3156 set_current_state(TASK_INTERRUPTIBLE);
3157 add_wait_queue(&info->event_wait_q, &wait);
3158
3159 spin_unlock_irqrestore(&info->lock,flags);
3160
3161 for(;;) {
3162 schedule();
3163 if (signal_pending(current)) {
3164 rc = -ERESTARTSYS;
3165 break;
3166 }
3167
3168 /* get current irq counts */
3169 spin_lock_irqsave(&info->lock,flags);
3170 cnow = info->icount;
3171 newsigs = info->input_signal_events;
3172 set_current_state(TASK_INTERRUPTIBLE);
3173 spin_unlock_irqrestore(&info->lock,flags);
3174
3175 /* if no change, wait aborted for some reason */
3176 if (newsigs.dsr_up == oldsigs.dsr_up &&
3177 newsigs.dsr_down == oldsigs.dsr_down &&
3178 newsigs.dcd_up == oldsigs.dcd_up &&
3179 newsigs.dcd_down == oldsigs.dcd_down &&
3180 newsigs.cts_up == oldsigs.cts_up &&
3181 newsigs.cts_down == oldsigs.cts_down &&
3182 newsigs.ri_up == oldsigs.ri_up &&
3183 newsigs.ri_down == oldsigs.ri_down &&
3184 cnow.exithunt == cprev.exithunt &&
3185 cnow.rxidle == cprev.rxidle) {
3186 rc = -EIO;
3187 break;
3188 }
3189
3190 events = mask &
3191 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
3192 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3193 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
3194 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3195 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
3196 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3197 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
3198 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
3199 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
3200 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
3201 if (events)
3202 break;
3203
3204 cprev = cnow;
3205 oldsigs = newsigs;
3206 }
3207
3208 remove_wait_queue(&info->event_wait_q, &wait);
3209 set_current_state(TASK_RUNNING);
3210
3211
3212 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3213 spin_lock_irqsave(&info->lock,flags);
3214 if (!waitqueue_active(&info->event_wait_q)) {
3215 /* disable enable exit hunt mode/idle rcvd IRQs */
3216 info->ie1_value &= ~(FLGD|IDLD);
3217 write_reg(info, IE1, info->ie1_value);
3218 }
3219 spin_unlock_irqrestore(&info->lock,flags);
3220 }
3221 exit:
3222 if ( rc == 0 )
3223 PUT_USER(rc, events, mask_ptr);
3224
3225 return rc;
3226 }
3227
3228 static int modem_input_wait(SLMP_INFO *info,int arg)
3229 {
3230 unsigned long flags;
3231 int rc;
3232 struct mgsl_icount cprev, cnow;
3233 DECLARE_WAITQUEUE(wait, current);
3234
3235 /* save current irq counts */
3236 spin_lock_irqsave(&info->lock,flags);
3237 cprev = info->icount;
3238 add_wait_queue(&info->status_event_wait_q, &wait);
3239 set_current_state(TASK_INTERRUPTIBLE);
3240 spin_unlock_irqrestore(&info->lock,flags);
3241
3242 for(;;) {
3243 schedule();
3244 if (signal_pending(current)) {
3245 rc = -ERESTARTSYS;
3246 break;
3247 }
3248
3249 /* get new irq counts */
3250 spin_lock_irqsave(&info->lock,flags);
3251 cnow = info->icount;
3252 set_current_state(TASK_INTERRUPTIBLE);
3253 spin_unlock_irqrestore(&info->lock,flags);
3254
3255 /* if no change, wait aborted for some reason */
3256 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3257 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3258 rc = -EIO;
3259 break;
3260 }
3261
3262 /* check for change in caller specified modem input */
3263 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3264 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3265 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3266 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3267 rc = 0;
3268 break;
3269 }
3270
3271 cprev = cnow;
3272 }
3273 remove_wait_queue(&info->status_event_wait_q, &wait);
3274 set_current_state(TASK_RUNNING);
3275 return rc;
3276 }
3277
3278 /* return the state of the serial control and status signals
3279 */
3280 static int tiocmget(struct tty_struct *tty, struct file *file)
3281 {
3282 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3283 unsigned int result;
3284 unsigned long flags;
3285
3286 spin_lock_irqsave(&info->lock,flags);
3287 get_signals(info);
3288 spin_unlock_irqrestore(&info->lock,flags);
3289
3290 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3291 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3292 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3293 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
3294 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3295 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3296
3297 if (debug_level >= DEBUG_LEVEL_INFO)
3298 printk("%s(%d):%s tiocmget() value=%08X\n",
3299 __FILE__,__LINE__, info->device_name, result );
3300 return result;
3301 }
3302
3303 /* set modem control signals (DTR/RTS)
3304 */
3305 static int tiocmset(struct tty_struct *tty, struct file *file,
3306 unsigned int set, unsigned int clear)
3307 {
3308 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3309 unsigned long flags;
3310
3311 if (debug_level >= DEBUG_LEVEL_INFO)
3312 printk("%s(%d):%s tiocmset(%x,%x)\n",
3313 __FILE__,__LINE__,info->device_name, set, clear);
3314
3315 if (set & TIOCM_RTS)
3316 info->serial_signals |= SerialSignal_RTS;
3317 if (set & TIOCM_DTR)
3318 info->serial_signals |= SerialSignal_DTR;
3319 if (clear & TIOCM_RTS)
3320 info->serial_signals &= ~SerialSignal_RTS;
3321 if (clear & TIOCM_DTR)
3322 info->serial_signals &= ~SerialSignal_DTR;
3323
3324 spin_lock_irqsave(&info->lock,flags);
3325 set_signals(info);
3326 spin_unlock_irqrestore(&info->lock,flags);
3327
3328 return 0;
3329 }
3330
3331
3332
3333 /* Block the current process until the specified port is ready to open.
3334 */
3335 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3336 SLMP_INFO *info)
3337 {
3338 DECLARE_WAITQUEUE(wait, current);
3339 int retval;
3340 bool do_clocal = false;
3341 bool extra_count = false;
3342 unsigned long flags;
3343
3344 if (debug_level >= DEBUG_LEVEL_INFO)
3345 printk("%s(%d):%s block_til_ready()\n",
3346 __FILE__,__LINE__, tty->driver->name );
3347
3348 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3349 /* nonblock mode is set or port is not enabled */
3350 /* just verify that callout device is not active */
3351 info->flags |= ASYNC_NORMAL_ACTIVE;
3352 return 0;
3353 }
3354
3355 if (tty->termios->c_cflag & CLOCAL)
3356 do_clocal = true;
3357
3358 /* Wait for carrier detect and the line to become
3359 * free (i.e., not in use by the callout). While we are in
3360 * this loop, info->count is dropped by one, so that
3361 * close() knows when to free things. We restore it upon
3362 * exit, either normal or abnormal.
3363 */
3364
3365 retval = 0;
3366 add_wait_queue(&info->open_wait, &wait);
3367
3368 if (debug_level >= DEBUG_LEVEL_INFO)
3369 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3370 __FILE__,__LINE__, tty->driver->name, info->count );
3371
3372 spin_lock_irqsave(&info->lock, flags);
3373 if (!tty_hung_up_p(filp)) {
3374 extra_count = true;
3375 info->count--;
3376 }
3377 spin_unlock_irqrestore(&info->lock, flags);
3378 info->blocked_open++;
3379
3380 while (1) {
3381 if ((tty->termios->c_cflag & CBAUD)) {
3382 spin_lock_irqsave(&info->lock,flags);
3383 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3384 set_signals(info);
3385 spin_unlock_irqrestore(&info->lock,flags);
3386 }
3387
3388 set_current_state(TASK_INTERRUPTIBLE);
3389
3390 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
3391 retval = (info->flags & ASYNC_HUP_NOTIFY) ?
3392 -EAGAIN : -ERESTARTSYS;
3393 break;
3394 }
3395
3396 spin_lock_irqsave(&info->lock,flags);
3397 get_signals(info);
3398 spin_unlock_irqrestore(&info->lock,flags);
3399
3400 if (!(info->flags & ASYNC_CLOSING) &&
3401 (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
3402 break;
3403 }
3404
3405 if (signal_pending(current)) {
3406 retval = -ERESTARTSYS;
3407 break;
3408 }
3409
3410 if (debug_level >= DEBUG_LEVEL_INFO)
3411 printk("%s(%d):%s block_til_ready() count=%d\n",
3412 __FILE__,__LINE__, tty->driver->name, info->count );
3413
3414 schedule();
3415 }
3416
3417 set_current_state(TASK_RUNNING);
3418 remove_wait_queue(&info->open_wait, &wait);
3419
3420 if (extra_count)
3421 info->count++;
3422 info->blocked_open--;
3423
3424 if (debug_level >= DEBUG_LEVEL_INFO)
3425 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3426 __FILE__,__LINE__, tty->driver->name, info->count );
3427
3428 if (!retval)
3429 info->flags |= ASYNC_NORMAL_ACTIVE;
3430
3431 return retval;
3432 }
3433
3434 static int alloc_dma_bufs(SLMP_INFO *info)
3435 {
3436 unsigned short BuffersPerFrame;
3437 unsigned short BufferCount;
3438
3439 // Force allocation to start at 64K boundary for each port.
3440 // This is necessary because *all* buffer descriptors for a port
3441 // *must* be in the same 64K block. All descriptors on a port
3442 // share a common 'base' address (upper 8 bits of 24 bits) programmed
3443 // into the CBP register.
3444 info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3445
3446 /* Calculate the number of DMA buffers necessary to hold the */
3447 /* largest allowable frame size. Note: If the max frame size is */
3448 /* not an even multiple of the DMA buffer size then we need to */
3449 /* round the buffer count per frame up one. */
3450
3451 BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3452 if ( info->max_frame_size % SCABUFSIZE )
3453 BuffersPerFrame++;
3454
3455 /* calculate total number of data buffers (SCABUFSIZE) possible
3456 * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3457 * for the descriptor list (BUFFERLISTSIZE).
3458 */
3459 BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3460
3461 /* limit number of buffers to maximum amount of descriptors */
3462 if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3463 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3464
3465 /* use enough buffers to transmit one max size frame */
3466 info->tx_buf_count = BuffersPerFrame + 1;
3467
3468 /* never use more than half the available buffers for transmit */
3469 if (info->tx_buf_count > (BufferCount/2))
3470 info->tx_buf_count = BufferCount/2;
3471
3472 if (info->tx_buf_count > SCAMAXDESC)
3473 info->tx_buf_count = SCAMAXDESC;
3474
3475 /* use remaining buffers for receive */
3476 info->rx_buf_count = BufferCount - info->tx_buf_count;
3477
3478 if (info->rx_buf_count > SCAMAXDESC)
3479 info->rx_buf_count = SCAMAXDESC;
3480
3481 if ( debug_level >= DEBUG_LEVEL_INFO )
3482 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3483 __FILE__,__LINE__, info->device_name,
3484 info->tx_buf_count,info->rx_buf_count);
3485
3486 if ( alloc_buf_list( info ) < 0 ||
3487 alloc_frame_bufs(info,
3488 info->rx_buf_list,
3489 info->rx_buf_list_ex,
3490 info->rx_buf_count) < 0 ||
3491 alloc_frame_bufs(info,
3492 info->tx_buf_list,
3493 info->tx_buf_list_ex,
3494 info->tx_buf_count) < 0 ||
3495 alloc_tmp_rx_buf(info) < 0 ) {
3496 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3497 __FILE__,__LINE__, info->device_name);
3498 return -ENOMEM;
3499 }
3500
3501 rx_reset_buffers( info );
3502
3503 return 0;
3504 }
3505
3506 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3507 */
3508 static int alloc_buf_list(SLMP_INFO *info)
3509 {
3510 unsigned int i;
3511
3512 /* build list in adapter shared memory */
3513 info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3514 info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3515 info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3516
3517 memset(info->buffer_list, 0, BUFFERLISTSIZE);
3518
3519 /* Save virtual address pointers to the receive and */
3520 /* transmit buffer lists. (Receive 1st). These pointers will */
3521 /* be used by the processor to access the lists. */
3522 info->rx_buf_list = (SCADESC *)info->buffer_list;
3523
3524 info->tx_buf_list = (SCADESC *)info->buffer_list;
3525 info->tx_buf_list += info->rx_buf_count;
3526
3527 /* Build links for circular buffer entry lists (tx and rx)
3528 *
3529 * Note: links are physical addresses read by the SCA device
3530 * to determine the next buffer entry to use.
3531 */
3532
3533 for ( i = 0; i < info->rx_buf_count; i++ ) {
3534 /* calculate and store physical address of this buffer entry */
3535 info->rx_buf_list_ex[i].phys_entry =
3536 info->buffer_list_phys + (i * sizeof(SCABUFSIZE));
3537
3538 /* calculate and store physical address of */
3539 /* next entry in cirular list of entries */
3540 info->rx_buf_list[i].next = info->buffer_list_phys;
3541 if ( i < info->rx_buf_count - 1 )
3542 info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3543
3544 info->rx_buf_list[i].length = SCABUFSIZE;
3545 }
3546
3547 for ( i = 0; i < info->tx_buf_count; i++ ) {
3548 /* calculate and store physical address of this buffer entry */
3549 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3550 ((info->rx_buf_count + i) * sizeof(SCADESC));
3551
3552 /* calculate and store physical address of */
3553 /* next entry in cirular list of entries */
3554
3555 info->tx_buf_list[i].next = info->buffer_list_phys +
3556 info->rx_buf_count * sizeof(SCADESC);
3557
3558 if ( i < info->tx_buf_count - 1 )
3559 info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3560 }
3561
3562 return 0;
3563 }
3564
3565 /* Allocate the frame DMA buffers used by the specified buffer list.
3566 */
3567 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3568 {
3569 int i;
3570 unsigned long phys_addr;
3571
3572 for ( i = 0; i < count; i++ ) {
3573 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3574 phys_addr = info->port_array[0]->last_mem_alloc;
3575 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3576
3577 buf_list[i].buf_ptr = (unsigned short)phys_addr;
3578 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3579 }
3580
3581 return 0;
3582 }
3583
3584 static void free_dma_bufs(SLMP_INFO *info)
3585 {
3586 info->buffer_list = NULL;
3587 info->rx_buf_list = NULL;
3588 info->tx_buf_list = NULL;
3589 }
3590
3591 /* allocate buffer large enough to hold max_frame_size.
3592 * This buffer is used to pass an assembled frame to the line discipline.
3593 */
3594 static int alloc_tmp_rx_buf(SLMP_INFO *info)
3595 {
3596 info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3597 if (info->tmp_rx_buf == NULL)
3598 return -ENOMEM;
3599 return 0;
3600 }
3601
3602 static void free_tmp_rx_buf(SLMP_INFO *info)
3603 {
3604 kfree(info->tmp_rx_buf);
3605 info->tmp_rx_buf = NULL;
3606 }
3607
3608 static int claim_resources(SLMP_INFO *info)
3609 {
3610 if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3611 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3612 __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3613 info->init_error = DiagStatus_AddressConflict;
3614 goto errout;
3615 }
3616 else
3617 info->shared_mem_requested = true;
3618
3619 if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3620 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3621 __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3622 info->init_error = DiagStatus_AddressConflict;
3623 goto errout;
3624 }
3625 else
3626 info->lcr_mem_requested = true;
3627
3628 if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3629 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3630 __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3631 info->init_error = DiagStatus_AddressConflict;
3632 goto errout;
3633 }
3634 else
3635 info->sca_base_requested = true;
3636
3637 if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3638 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3639 __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3640 info->init_error = DiagStatus_AddressConflict;
3641 goto errout;
3642 }
3643 else
3644 info->sca_statctrl_requested = true;
3645
3646 info->memory_base = ioremap_nocache(info->phys_memory_base,
3647 SCA_MEM_SIZE);
3648 if (!info->memory_base) {
3649 printk( "%s(%d):%s Cant map shared memory, MemAddr=%08X\n",
3650 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3651 info->init_error = DiagStatus_CantAssignPciResources;
3652 goto errout;
3653 }
3654
3655 info->lcr_base = ioremap_nocache(info->phys_lcr_base, PAGE_SIZE);
3656 if (!info->lcr_base) {
3657 printk( "%s(%d):%s Cant map LCR memory, MemAddr=%08X\n",
3658 __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3659 info->init_error = DiagStatus_CantAssignPciResources;
3660 goto errout;
3661 }
3662 info->lcr_base += info->lcr_offset;
3663
3664 info->sca_base = ioremap_nocache(info->phys_sca_base, PAGE_SIZE);
3665 if (!info->sca_base) {
3666 printk( "%s(%d):%s Cant map SCA memory, MemAddr=%08X\n",
3667 __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3668 info->init_error = DiagStatus_CantAssignPciResources;
3669 goto errout;
3670 }
3671 info->sca_base += info->sca_offset;
3672
3673 info->statctrl_base = ioremap_nocache(info->phys_statctrl_base,
3674 PAGE_SIZE);
3675 if (!info->statctrl_base) {
3676 printk( "%s(%d):%s Cant map SCA Status/Control memory, MemAddr=%08X\n",
3677 __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3678 info->init_error = DiagStatus_CantAssignPciResources;
3679 goto errout;
3680 }
3681 info->statctrl_base += info->statctrl_offset;
3682
3683 if ( !memory_test(info) ) {
3684 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3685 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3686 info->init_error = DiagStatus_MemoryError;
3687 goto errout;
3688 }
3689
3690 return 0;
3691
3692 errout:
3693 release_resources( info );
3694 return -ENODEV;
3695 }
3696
3697 static void release_resources(SLMP_INFO *info)
3698 {
3699 if ( debug_level >= DEBUG_LEVEL_INFO )
3700 printk( "%s(%d):%s release_resources() entry\n",
3701 __FILE__,__LINE__,info->device_name );
3702
3703 if ( info->irq_requested ) {
3704 free_irq(info->irq_level, info);
3705 info->irq_requested = false;
3706 }
3707
3708 if ( info->shared_mem_requested ) {
3709 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3710 info->shared_mem_requested = false;
3711 }
3712 if ( info->lcr_mem_requested ) {
3713 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3714 info->lcr_mem_requested = false;
3715 }
3716 if ( info->sca_base_requested ) {
3717 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3718 info->sca_base_requested = false;
3719 }
3720 if ( info->sca_statctrl_requested ) {
3721 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3722 info->sca_statctrl_requested = false;
3723 }
3724
3725 if (info->memory_base){
3726 iounmap(info->memory_base);
3727 info->memory_base = NULL;
3728 }
3729
3730 if (info->sca_base) {
3731 iounmap(info->sca_base - info->sca_offset);
3732 info->sca_base=NULL;
3733 }
3734
3735 if (info->statctrl_base) {
3736 iounmap(info->statctrl_base - info->statctrl_offset);
3737 info->statctrl_base=NULL;
3738 }
3739
3740 if (info->lcr_base){
3741 iounmap(info->lcr_base - info->lcr_offset);
3742 info->lcr_base = NULL;
3743 }
3744
3745 if ( debug_level >= DEBUG_LEVEL_INFO )
3746 printk( "%s(%d):%s release_resources() exit\n",
3747 __FILE__,__LINE__,info->device_name );
3748 }
3749
3750 /* Add the specified device instance data structure to the
3751 * global linked list of devices and increment the device count.
3752 */
3753 static void add_device(SLMP_INFO *info)
3754 {
3755 info->next_device = NULL;
3756 info->line = synclinkmp_device_count;
3757 sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3758
3759 if (info->line < MAX_DEVICES) {
3760 if (maxframe[info->line])
3761 info->max_frame_size = maxframe[info->line];
3762 info->dosyncppp = dosyncppp[info->line];
3763 }
3764
3765 synclinkmp_device_count++;
3766
3767 if ( !synclinkmp_device_list )
3768 synclinkmp_device_list = info;
3769 else {
3770 SLMP_INFO *current_dev = synclinkmp_device_list;
3771 while( current_dev->next_device )
3772 current_dev = current_dev->next_device;
3773 current_dev->next_device = info;
3774 }
3775
3776 if ( info->max_frame_size < 4096 )
3777 info->max_frame_size = 4096;
3778 else if ( info->max_frame_size > 65535 )
3779 info->max_frame_size = 65535;
3780
3781 printk( "SyncLink MultiPort %s: "
3782 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3783 info->device_name,
3784 info->phys_sca_base,
3785 info->phys_memory_base,
3786 info->phys_statctrl_base,
3787 info->phys_lcr_base,
3788 info->irq_level,
3789 info->max_frame_size );
3790
3791 #if SYNCLINK_GENERIC_HDLC
3792 hdlcdev_init(info);
3793 #endif
3794 }
3795
3796 /* Allocate and initialize a device instance structure
3797 *
3798 * Return Value: pointer to SLMP_INFO if success, otherwise NULL
3799 */
3800 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3801 {
3802 SLMP_INFO *info;
3803
3804 info = kzalloc(sizeof(SLMP_INFO),
3805 GFP_KERNEL);
3806
3807 if (!info) {
3808 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3809 __FILE__,__LINE__, adapter_num, port_num);
3810 } else {
3811 info->magic = MGSL_MAGIC;
3812 INIT_WORK(&info->task, bh_handler);
3813 info->max_frame_size = 4096;
3814 info->close_delay = 5*HZ/10;
3815 info->closing_wait = 30*HZ;
3816 init_waitqueue_head(&info->open_wait);
3817 init_waitqueue_head(&info->close_wait);
3818 init_waitqueue_head(&info->status_event_wait_q);
3819 init_waitqueue_head(&info->event_wait_q);
3820 spin_lock_init(&info->netlock);
3821 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3822 info->idle_mode = HDLC_TXIDLE_FLAGS;
3823 info->adapter_num = adapter_num;
3824 info->port_num = port_num;
3825
3826 /* Copy configuration info to device instance data */
3827 info->irq_level = pdev->irq;
3828 info->phys_lcr_base = pci_resource_start(pdev,0);
3829 info->phys_sca_base = pci_resource_start(pdev,2);
3830 info->phys_memory_base = pci_resource_start(pdev,3);
3831 info->phys_statctrl_base = pci_resource_start(pdev,4);
3832
3833 /* Because veremap only works on page boundaries we must map
3834 * a larger area than is actually implemented for the LCR
3835 * memory range. We map a full page starting at the page boundary.
3836 */
3837 info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
3838 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3839
3840 info->sca_offset = info->phys_sca_base & (PAGE_SIZE-1);
3841 info->phys_sca_base &= ~(PAGE_SIZE-1);
3842
3843 info->statctrl_offset = info->phys_statctrl_base & (PAGE_SIZE-1);
3844 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3845
3846 info->bus_type = MGSL_BUS_TYPE_PCI;
3847 info->irq_flags = IRQF_SHARED;
3848
3849 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3850 setup_timer(&info->status_timer, status_timeout,
3851 (unsigned long)info);
3852
3853 /* Store the PCI9050 misc control register value because a flaw
3854 * in the PCI9050 prevents LCR registers from being read if
3855 * BIOS assigns an LCR base address with bit 7 set.
3856 *
3857 * Only the misc control register is accessed for which only
3858 * write access is needed, so set an initial value and change
3859 * bits to the device instance data as we write the value
3860 * to the actual misc control register.
3861 */
3862 info->misc_ctrl_value = 0x087e4546;
3863
3864 /* initial port state is unknown - if startup errors
3865 * occur, init_error will be set to indicate the
3866 * problem. Once the port is fully initialized,
3867 * this value will be set to 0 to indicate the
3868 * port is available.
3869 */
3870 info->init_error = -1;
3871 }
3872
3873 return info;
3874 }
3875
3876 static void device_init(int adapter_num, struct pci_dev *pdev)
3877 {
3878 SLMP_INFO *port_array[SCA_MAX_PORTS];
3879 int port;
3880
3881 /* allocate device instances for up to SCA_MAX_PORTS devices */
3882 for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3883 port_array[port] = alloc_dev(adapter_num,port,pdev);
3884 if( port_array[port] == NULL ) {
3885 for ( --port; port >= 0; --port )
3886 kfree(port_array[port]);
3887 return;
3888 }
3889 }
3890
3891 /* give copy of port_array to all ports and add to device list */
3892 for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3893 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3894 add_device( port_array[port] );
3895 spin_lock_init(&port_array[port]->lock);
3896 }
3897
3898 /* Allocate and claim adapter resources */
3899 if ( !claim_resources(port_array[0]) ) {
3900
3901 alloc_dma_bufs(port_array[0]);
3902
3903 /* copy resource information from first port to others */
3904 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3905 port_array[port]->lock = port_array[0]->lock;
3906 port_array[port]->irq_level = port_array[0]->irq_level;
3907 port_array[port]->memory_base = port_array[0]->memory_base;
3908 port_array[port]->sca_base = port_array[0]->sca_base;
3909 port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3910 port_array[port]->lcr_base = port_array[0]->lcr_base;
3911 alloc_dma_bufs(port_array[port]);
3912 }
3913
3914 if ( request_irq(port_array[0]->irq_level,
3915 synclinkmp_interrupt,
3916 port_array[0]->irq_flags,
3917 port_array[0]->device_name,
3918 port_array[0]) < 0 ) {
3919 printk( "%s(%d):%s Cant request interrupt, IRQ=%d\n",
3920 __FILE__,__LINE__,
3921 port_array[0]->device_name,
3922 port_array[0]->irq_level );
3923 }
3924 else {
3925 port_array[0]->irq_requested = true;
3926 adapter_test(port_array[0]);
3927 }
3928 }
3929 }
3930
3931 static const struct tty_operations ops = {
3932 .open = open,
3933 .close = close,
3934 .write = write,
3935 .put_char = put_char,
3936 .flush_chars = flush_chars,
3937 .write_room = write_room,
3938 .chars_in_buffer = chars_in_buffer,
3939 .flush_buffer = flush_buffer,
3940 .ioctl = ioctl,
3941 .throttle = throttle,
3942 .unthrottle = unthrottle,
3943 .send_xchar = send_xchar,
3944 .break_ctl = set_break,
3945 .wait_until_sent = wait_until_sent,
3946 .read_proc = read_proc,
3947 .set_termios = set_termios,
3948 .stop = tx_hold,
3949 .start = tx_release,
3950 .hangup = hangup,
3951 .tiocmget = tiocmget,
3952 .tiocmset = tiocmset,
3953 };
3954
3955 static void synclinkmp_cleanup(void)
3956 {
3957 int rc;
3958 SLMP_INFO *info;
3959 SLMP_INFO *tmp;
3960
3961 printk("Unloading %s %s\n", driver_name, driver_version);
3962
3963 if (serial_driver) {
3964 if ((rc = tty_unregister_driver(serial_driver)))
3965 printk("%s(%d) failed to unregister tty driver err=%d\n",
3966 __FILE__,__LINE__,rc);
3967 put_tty_driver(serial_driver);
3968 }
3969
3970 /* reset devices */
3971 info = synclinkmp_device_list;
3972 while(info) {
3973 reset_port(info);
3974 info = info->next_device;
3975 }
3976
3977 /* release devices */
3978 info = synclinkmp_device_list;
3979 while(info) {
3980 #if SYNCLINK_GENERIC_HDLC
3981 hdlcdev_exit(info);
3982 #endif
3983 free_dma_bufs(info);
3984 free_tmp_rx_buf(info);
3985 if ( info->port_num == 0 ) {
3986 if (info->sca_base)
3987 write_reg(info, LPR, 1); /* set low power mode */
3988 release_resources(info);
3989 }
3990 tmp = info;
3991 info = info->next_device;
3992 kfree(tmp);
3993 }
3994
3995 pci_unregister_driver(&synclinkmp_pci_driver);
3996 }
3997
3998 /* Driver initialization entry point.
3999 */
4000
4001 static int __init synclinkmp_init(void)
4002 {
4003 int rc;
4004
4005 if (break_on_load) {
4006 synclinkmp_get_text_ptr();
4007 BREAKPOINT();
4008 }
4009
4010 printk("%s %s\n", driver_name, driver_version);
4011
4012 if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
4013 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
4014 return rc;
4015 }
4016
4017 serial_driver = alloc_tty_driver(128);
4018 if (!serial_driver) {
4019 rc = -ENOMEM;
4020 goto error;
4021 }
4022
4023 /* Initialize the tty_driver structure */
4024
4025 serial_driver->owner = THIS_MODULE;
4026 serial_driver->driver_name = "synclinkmp";
4027 serial_driver->name = "ttySLM";
4028 serial_driver->major = ttymajor;
4029 serial_driver->minor_start = 64;
4030 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4031 serial_driver->subtype = SERIAL_TYPE_NORMAL;
4032 serial_driver->init_termios = tty_std_termios;
4033 serial_driver->init_termios.c_cflag =
4034 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4035 serial_driver->init_termios.c_ispeed = 9600;
4036 serial_driver->init_termios.c_ospeed = 9600;
4037 serial_driver->flags = TTY_DRIVER_REAL_RAW;
4038 tty_set_operations(serial_driver, &ops);
4039 if ((rc = tty_register_driver(serial_driver)) < 0) {
4040 printk("%s(%d):Couldn't register serial driver\n",
4041 __FILE__,__LINE__);
4042 put_tty_driver(serial_driver);
4043 serial_driver = NULL;
4044 goto error;
4045 }
4046
4047 printk("%s %s, tty major#%d\n",
4048 driver_name, driver_version,
4049 serial_driver->major);
4050
4051 return 0;
4052
4053 error:
4054 synclinkmp_cleanup();
4055 return rc;
4056 }
4057
4058 static void __exit synclinkmp_exit(void)
4059 {
4060 synclinkmp_cleanup();
4061 }
4062
4063 module_init(synclinkmp_init);
4064 module_exit(synclinkmp_exit);
4065
4066 /* Set the port for internal loopback mode.
4067 * The TxCLK and RxCLK signals are generated from the BRG and
4068 * the TxD is looped back to the RxD internally.
4069 */
4070 static void enable_loopback(SLMP_INFO *info, int enable)
4071 {
4072 if (enable) {
4073 /* MD2 (Mode Register 2)
4074 * 01..00 CNCT<1..0> Channel Connection 11=Local Loopback
4075 */
4076 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4077
4078 /* degate external TxC clock source */
4079 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4080 write_control_reg(info);
4081
4082 /* RXS/TXS (Rx/Tx clock source)
4083 * 07 Reserved, must be 0
4084 * 06..04 Clock Source, 100=BRG
4085 * 03..00 Clock Divisor, 0000=1
4086 */
4087 write_reg(info, RXS, 0x40);
4088 write_reg(info, TXS, 0x40);
4089
4090 } else {
4091 /* MD2 (Mode Register 2)
4092 * 01..00 CNCT<1..0> Channel connection, 0=normal
4093 */
4094 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4095
4096 /* RXS/TXS (Rx/Tx clock source)
4097 * 07 Reserved, must be 0
4098 * 06..04 Clock Source, 000=RxC/TxC Pin
4099 * 03..00 Clock Divisor, 0000=1
4100 */
4101 write_reg(info, RXS, 0x00);
4102 write_reg(info, TXS, 0x00);
4103 }
4104
4105 /* set LinkSpeed if available, otherwise default to 2Mbps */
4106 if (info->params.clock_speed)
4107 set_rate(info, info->params.clock_speed);
4108 else
4109 set_rate(info, 3686400);
4110 }
4111
4112 /* Set the baud rate register to the desired speed
4113 *
4114 * data_rate data rate of clock in bits per second
4115 * A data rate of 0 disables the AUX clock.
4116 */
4117 static void set_rate( SLMP_INFO *info, u32 data_rate )
4118 {
4119 u32 TMCValue;
4120 unsigned char BRValue;
4121 u32 Divisor=0;
4122
4123 /* fBRG = fCLK/(TMC * 2^BR)
4124 */
4125 if (data_rate != 0) {
4126 Divisor = 14745600/data_rate;
4127 if (!Divisor)
4128 Divisor = 1;
4129
4130 TMCValue = Divisor;
4131
4132 BRValue = 0;
4133 if (TMCValue != 1 && TMCValue != 2) {
4134 /* BRValue of 0 provides 50/50 duty cycle *only* when
4135 * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4136 * 50/50 duty cycle.
4137 */
4138 BRValue = 1;
4139 TMCValue >>= 1;
4140 }
4141
4142 /* while TMCValue is too big for TMC register, divide
4143 * by 2 and increment BR exponent.
4144 */
4145 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4146 TMCValue >>= 1;
4147
4148 write_reg(info, TXS,
4149 (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4150 write_reg(info, RXS,
4151 (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4152 write_reg(info, TMC, (unsigned char)TMCValue);
4153 }
4154 else {
4155 write_reg(info, TXS,0);
4156 write_reg(info, RXS,0);
4157 write_reg(info, TMC, 0);
4158 }
4159 }
4160
4161 /* Disable receiver
4162 */
4163 static void rx_stop(SLMP_INFO *info)
4164 {
4165 if (debug_level >= DEBUG_LEVEL_ISR)
4166 printk("%s(%d):%s rx_stop()\n",
4167 __FILE__,__LINE__, info->device_name );
4168
4169 write_reg(info, CMD, RXRESET);
4170
4171 info->ie0_value &= ~RXRDYE;
4172 write_reg(info, IE0, info->ie0_value); /* disable Rx data interrupts */
4173
4174 write_reg(info, RXDMA + DSR, 0); /* disable Rx DMA */
4175 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4176 write_reg(info, RXDMA + DIR, 0); /* disable Rx DMA interrupts */
4177
4178 info->rx_enabled = false;
4179 info->rx_overflow = false;
4180 }
4181
4182 /* enable the receiver
4183 */
4184 static void rx_start(SLMP_INFO *info)
4185 {
4186 int i;
4187
4188 if (debug_level >= DEBUG_LEVEL_ISR)
4189 printk("%s(%d):%s rx_start()\n",
4190 __FILE__,__LINE__, info->device_name );
4191
4192 write_reg(info, CMD, RXRESET);
4193
4194 if ( info->params.mode == MGSL_MODE_HDLC ) {
4195 /* HDLC, disabe IRQ on rxdata */
4196 info->ie0_value &= ~RXRDYE;
4197 write_reg(info, IE0, info->ie0_value);
4198
4199 /* Reset all Rx DMA buffers and program rx dma */
4200 write_reg(info, RXDMA + DSR, 0); /* disable Rx DMA */
4201 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4202
4203 for (i = 0; i < info->rx_buf_count; i++) {
4204 info->rx_buf_list[i].status = 0xff;
4205
4206 // throttle to 4 shared memory writes at a time to prevent
4207 // hogging local bus (keep latency time for DMA requests low).
4208 if (!(i % 4))
4209 read_status_reg(info);
4210 }
4211 info->current_rx_buf = 0;
4212
4213 /* set current/1st descriptor address */
4214 write_reg16(info, RXDMA + CDA,
4215 info->rx_buf_list_ex[0].phys_entry);
4216
4217 /* set new last rx descriptor address */
4218 write_reg16(info, RXDMA + EDA,
4219 info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4220
4221 /* set buffer length (shared by all rx dma data buffers) */
4222 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4223
4224 write_reg(info, RXDMA + DIR, 0x60); /* enable Rx DMA interrupts (EOM/BOF) */
4225 write_reg(info, RXDMA + DSR, 0xf2); /* clear Rx DMA IRQs, enable Rx DMA */
4226 } else {
4227 /* async, enable IRQ on rxdata */
4228 info->ie0_value |= RXRDYE;
4229 write_reg(info, IE0, info->ie0_value);
4230 }
4231
4232 write_reg(info, CMD, RXENABLE);
4233
4234 info->rx_overflow = false;
4235 info->rx_enabled = true;
4236 }
4237
4238 /* Enable the transmitter and send a transmit frame if
4239 * one is loaded in the DMA buffers.
4240 */
4241 static void tx_start(SLMP_INFO *info)
4242 {
4243 if (debug_level >= DEBUG_LEVEL_ISR)
4244 printk("%s(%d):%s tx_start() tx_count=%d\n",
4245 __FILE__,__LINE__, info->device_name,info->tx_count );
4246
4247 if (!info->tx_enabled ) {
4248 write_reg(info, CMD, TXRESET);
4249 write_reg(info, CMD, TXENABLE);
4250 info->tx_enabled = true;
4251 }
4252
4253 if ( info->tx_count ) {
4254
4255 /* If auto RTS enabled and RTS is inactive, then assert */
4256 /* RTS and set a flag indicating that the driver should */
4257 /* negate RTS when the transmission completes. */
4258
4259 info->drop_rts_on_tx_done = false;
4260
4261 if (info->params.mode != MGSL_MODE_ASYNC) {
4262
4263 if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4264 get_signals( info );
4265 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4266 info->serial_signals |= SerialSignal_RTS;
4267 set_signals( info );
4268 info->drop_rts_on_tx_done = true;
4269 }
4270 }
4271
4272 write_reg16(info, TRC0,
4273 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4274
4275 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
4276 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4277
4278 /* set TX CDA (current descriptor address) */
4279 write_reg16(info, TXDMA + CDA,
4280 info->tx_buf_list_ex[0].phys_entry);
4281
4282 /* set TX EDA (last descriptor address) */
4283 write_reg16(info, TXDMA + EDA,
4284 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4285
4286 /* enable underrun IRQ */
4287 info->ie1_value &= ~IDLE;
4288 info->ie1_value |= UDRN;
4289 write_reg(info, IE1, info->ie1_value);
4290 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4291
4292 write_reg(info, TXDMA + DIR, 0x40); /* enable Tx DMA interrupts (EOM) */
4293 write_reg(info, TXDMA + DSR, 0xf2); /* clear Tx DMA IRQs, enable Tx DMA */
4294
4295 mod_timer(&info->tx_timer, jiffies +
4296 msecs_to_jiffies(5000));
4297 }
4298 else {
4299 tx_load_fifo(info);
4300 /* async, enable IRQ on txdata */
4301 info->ie0_value |= TXRDYE;
4302 write_reg(info, IE0, info->ie0_value);
4303 }
4304
4305 info->tx_active = true;
4306 }
4307 }
4308
4309 /* stop the transmitter and DMA
4310 */
4311 static void tx_stop( SLMP_INFO *info )
4312 {
4313 if (debug_level >= DEBUG_LEVEL_ISR)
4314 printk("%s(%d):%s tx_stop()\n",
4315 __FILE__,__LINE__, info->device_name );
4316
4317 del_timer(&info->tx_timer);
4318
4319 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
4320 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4321
4322 write_reg(info, CMD, TXRESET);
4323
4324 info->ie1_value &= ~(UDRN + IDLE);
4325 write_reg(info, IE1, info->ie1_value); /* disable tx status interrupts */
4326 write_reg(info, SR1, (unsigned char)(IDLE + UDRN)); /* clear pending */
4327
4328 info->ie0_value &= ~TXRDYE;
4329 write_reg(info, IE0, info->ie0_value); /* disable tx data interrupts */
4330
4331 info->tx_enabled = false;
4332 info->tx_active = false;
4333 }
4334
4335 /* Fill the transmit FIFO until the FIFO is full or
4336 * there is no more data to load.
4337 */
4338 static void tx_load_fifo(SLMP_INFO *info)
4339 {
4340 u8 TwoBytes[2];
4341
4342 /* do nothing is now tx data available and no XON/XOFF pending */
4343
4344 if ( !info->tx_count && !info->x_char )
4345 return;
4346
4347 /* load the Transmit FIFO until FIFOs full or all data sent */
4348
4349 while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4350
4351 /* there is more space in the transmit FIFO and */
4352 /* there is more data in transmit buffer */
4353
4354 if ( (info->tx_count > 1) && !info->x_char ) {
4355 /* write 16-bits */
4356 TwoBytes[0] = info->tx_buf[info->tx_get++];
4357 if (info->tx_get >= info->max_frame_size)
4358 info->tx_get -= info->max_frame_size;
4359 TwoBytes[1] = info->tx_buf[info->tx_get++];
4360 if (info->tx_get >= info->max_frame_size)
4361 info->tx_get -= info->max_frame_size;
4362
4363 write_reg16(info, TRB, *((u16 *)TwoBytes));
4364
4365 info->tx_count -= 2;
4366 info->icount.tx += 2;
4367 } else {
4368 /* only 1 byte left to transmit or 1 FIFO slot left */
4369
4370 if (info->x_char) {
4371 /* transmit pending high priority char */
4372 write_reg(info, TRB, info->x_char);
4373 info->x_char = 0;
4374 } else {
4375 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4376 if (info->tx_get >= info->max_frame_size)
4377 info->tx_get -= info->max_frame_size;
4378 info->tx_count--;
4379 }
4380 info->icount.tx++;
4381 }
4382 }
4383 }
4384
4385 /* Reset a port to a known state
4386 */
4387 static void reset_port(SLMP_INFO *info)
4388 {
4389 if (info->sca_base) {
4390
4391 tx_stop(info);
4392 rx_stop(info);
4393
4394 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
4395 set_signals(info);
4396
4397 /* disable all port interrupts */
4398 info->ie0_value = 0;
4399 info->ie1_value = 0;
4400 info->ie2_value = 0;
4401 write_reg(info, IE0, info->ie0_value);
4402 write_reg(info, IE1, info->ie1_value);
4403 write_reg(info, IE2, info->ie2_value);
4404
4405 write_reg(info, CMD, CHRESET);
4406 }
4407 }
4408
4409 /* Reset all the ports to a known state.
4410 */
4411 static void reset_adapter(SLMP_INFO *info)
4412 {
4413 int i;
4414
4415 for ( i=0; i < SCA_MAX_PORTS; ++i) {
4416 if (info->port_array[i])
4417 reset_port(info->port_array[i]);
4418 }
4419 }
4420
4421 /* Program port for asynchronous communications.
4422 */
4423 static void async_mode(SLMP_INFO *info)
4424 {
4425
4426 unsigned char RegValue;
4427
4428 tx_stop(info);
4429 rx_stop(info);
4430
4431 /* MD0, Mode Register 0
4432 *
4433 * 07..05 PRCTL<2..0>, Protocol Mode, 000=async
4434 * 04 AUTO, Auto-enable (RTS/CTS/DCD)
4435 * 03 Reserved, must be 0
4436 * 02 CRCCC, CRC Calculation, 0=disabled
4437 * 01..00 STOP<1..0> Stop bits (00=1,10=2)
4438 *
4439 * 0000 0000
4440 */
4441 RegValue = 0x00;
4442 if (info->params.stop_bits != 1)
4443 RegValue |= BIT1;
4444 write_reg(info, MD0, RegValue);
4445
4446 /* MD1, Mode Register 1
4447 *
4448 * 07..06 BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4449 * 05..04 TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4450 * 03..02 RXCHR<1..0>, rx char size
4451 * 01..00 PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4452 *
4453 * 0100 0000
4454 */
4455 RegValue = 0x40;
4456 switch (info->params.data_bits) {
4457 case 7: RegValue |= BIT4 + BIT2; break;
4458 case 6: RegValue |= BIT5 + BIT3; break;
4459 case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4460 }
4461 if (info->params.parity != ASYNC_PARITY_NONE) {
4462 RegValue |= BIT1;
4463 if (info->params.parity == ASYNC_PARITY_ODD)
4464 RegValue |= BIT0;
4465 }
4466 write_reg(info, MD1, RegValue);
4467
4468 /* MD2, Mode Register 2
4469 *
4470 * 07..02 Reserved, must be 0
4471 * 01..00 CNCT<1..0> Channel connection, 00=normal 11=local loopback
4472 *
4473 * 0000 0000
4474 */
4475 RegValue = 0x00;
4476 if (info->params.loopback)
4477 RegValue |= (BIT1 + BIT0);
4478 write_reg(info, MD2, RegValue);
4479
4480 /* RXS, Receive clock source
4481 *
4482 * 07 Reserved, must be 0
4483 * 06..04 RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4484 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4485 */
4486 RegValue=BIT6;
4487 write_reg(info, RXS, RegValue);
4488
4489 /* TXS, Transmit clock source
4490 *
4491 * 07 Reserved, must be 0
4492 * 06..04 RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4493 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4494 */
4495 RegValue=BIT6;
4496 write_reg(info, TXS, RegValue);
4497
4498 /* Control Register
4499 *
4500 * 6,4,2,0 CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4501 */
4502 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4503 write_control_reg(info);
4504
4505 tx_set_idle(info);
4506
4507 /* RRC Receive Ready Control 0
4508 *
4509 * 07..05 Reserved, must be 0
4510 * 04..00 RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4511 */
4512 write_reg(info, RRC, 0x00);
4513
4514 /* TRC0 Transmit Ready Control 0
4515 *
4516 * 07..05 Reserved, must be 0
4517 * 04..00 TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4518 */
4519 write_reg(info, TRC0, 0x10);
4520
4521 /* TRC1 Transmit Ready Control 1
4522 *
4523 * 07..05 Reserved, must be 0
4524 * 04..00 TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4525 */
4526 write_reg(info, TRC1, 0x1e);
4527
4528 /* CTL, MSCI control register
4529 *
4530 * 07..06 Reserved, set to 0
4531 * 05 UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4532 * 04 IDLC, idle control, 0=mark 1=idle register
4533 * 03 BRK, break, 0=off 1 =on (async)
4534 * 02 SYNCLD, sync char load enable (BSC) 1=enabled
4535 * 01 GOP, go active on poll (LOOP mode) 1=enabled
4536 * 00 RTS, RTS output control, 0=active 1=inactive
4537 *
4538 * 0001 0001
4539 */
4540 RegValue = 0x10;
4541 if (!(info->serial_signals & SerialSignal_RTS))
4542 RegValue |= 0x01;
4543 write_reg(info, CTL, RegValue);
4544
4545 /* enable status interrupts */
4546 info->ie0_value |= TXINTE + RXINTE;
4547 write_reg(info, IE0, info->ie0_value);
4548
4549 /* enable break detect interrupt */
4550 info->ie1_value = BRKD;
4551 write_reg(info, IE1, info->ie1_value);
4552
4553 /* enable rx overrun interrupt */
4554 info->ie2_value = OVRN;
4555 write_reg(info, IE2, info->ie2_value);
4556
4557 set_rate( info, info->params.data_rate * 16 );
4558 }
4559
4560 /* Program the SCA for HDLC communications.
4561 */
4562 static void hdlc_mode(SLMP_INFO *info)
4563 {
4564 unsigned char RegValue;
4565 u32 DpllDivisor;
4566
4567 // Can't use DPLL because SCA outputs recovered clock on RxC when
4568 // DPLL mode selected. This causes output contention with RxC receiver.
4569 // Use of DPLL would require external hardware to disable RxC receiver
4570 // when DPLL mode selected.
4571 info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4572
4573 /* disable DMA interrupts */
4574 write_reg(info, TXDMA + DIR, 0);
4575 write_reg(info, RXDMA + DIR, 0);
4576
4577 /* MD0, Mode Register 0
4578 *
4579 * 07..05 PRCTL<2..0>, Protocol Mode, 100=HDLC
4580 * 04 AUTO, Auto-enable (RTS/CTS/DCD)
4581 * 03 Reserved, must be 0
4582 * 02 CRCCC, CRC Calculation, 1=enabled
4583 * 01 CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4584 * 00 CRC0, CRC initial value, 1 = all 1s
4585 *
4586 * 1000 0001
4587 */
4588 RegValue = 0x81;
4589 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4590 RegValue |= BIT4;
4591 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4592 RegValue |= BIT4;
4593 if (info->params.crc_type == HDLC_CRC_16_CCITT)
4594 RegValue |= BIT2 + BIT1;
4595 write_reg(info, MD0, RegValue);
4596
4597 /* MD1, Mode Register 1
4598 *
4599 * 07..06 ADDRS<1..0>, Address detect, 00=no addr check
4600 * 05..04 TXCHR<1..0>, tx char size, 00=8 bits
4601 * 03..02 RXCHR<1..0>, rx char size, 00=8 bits
4602 * 01..00 PMPM<1..0>, Parity mode, 00=no parity
4603 *
4604 * 0000 0000
4605 */
4606 RegValue = 0x00;
4607 write_reg(info, MD1, RegValue);
4608
4609 /* MD2, Mode Register 2
4610 *
4611 * 07 NRZFM, 0=NRZ, 1=FM
4612 * 06..05 CODE<1..0> Encoding, 00=NRZ
4613 * 04..03 DRATE<1..0> DPLL Divisor, 00=8
4614 * 02 Reserved, must be 0
4615 * 01..00 CNCT<1..0> Channel connection, 0=normal
4616 *
4617 * 0000 0000
4618 */
4619 RegValue = 0x00;
4620 switch(info->params.encoding) {
4621 case HDLC_ENCODING_NRZI: RegValue |= BIT5; break;
4622 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4623 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4624 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break; /* aka Manchester */
4625 #if 0
4626 case HDLC_ENCODING_NRZB: /* not supported */
4627 case HDLC_ENCODING_NRZI_MARK: /* not supported */
4628 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: /* not supported */
4629 #endif
4630 }
4631 if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4632 DpllDivisor = 16;
4633 RegValue |= BIT3;
4634 } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4635 DpllDivisor = 8;
4636 } else {
4637 DpllDivisor = 32;
4638 RegValue |= BIT4;
4639 }
4640 write_reg(info, MD2, RegValue);
4641
4642
4643 /* RXS, Receive clock source
4644 *
4645 * 07 Reserved, must be 0
4646 * 06..04 RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4647 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4648 */
4649 RegValue=0;
4650 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4651 RegValue |= BIT6;
4652 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4653 RegValue |= BIT6 + BIT5;
4654 write_reg(info, RXS, RegValue);
4655
4656 /* TXS, Transmit clock source
4657 *
4658 * 07 Reserved, must be 0
4659 * 06..04 RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4660 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4661 */
4662 RegValue=0;
4663 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4664 RegValue |= BIT6;
4665 if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4666 RegValue |= BIT6 + BIT5;
4667 write_reg(info, TXS, RegValue);
4668
4669 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4670 set_rate(info, info->params.clock_speed * DpllDivisor);
4671 else
4672 set_rate(info, info->params.clock_speed);
4673
4674 /* GPDATA (General Purpose I/O Data Register)
4675 *
4676 * 6,4,2,0 CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4677 */
4678 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4679 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4680 else
4681 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4682 write_control_reg(info);
4683
4684 /* RRC Receive Ready Control 0
4685 *
4686 * 07..05 Reserved, must be 0
4687 * 04..00 RRC<4..0> Rx FIFO trigger active
4688 */
4689 write_reg(info, RRC, rx_active_fifo_level);
4690
4691 /* TRC0 Transmit Ready Control 0
4692 *
4693 * 07..05 Reserved, must be 0
4694 * 04..00 TRC<4..0> Tx FIFO trigger active
4695 */
4696 write_reg(info, TRC0, tx_active_fifo_level);
4697
4698 /* TRC1 Transmit Ready Control 1
4699 *
4700 * 07..05 Reserved, must be 0
4701 * 04..00 TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4702 */
4703 write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4704
4705 /* DMR, DMA Mode Register
4706 *
4707 * 07..05 Reserved, must be 0
4708 * 04 TMOD, Transfer Mode: 1=chained-block
4709 * 03 Reserved, must be 0
4710 * 02 NF, Number of Frames: 1=multi-frame
4711 * 01 CNTE, Frame End IRQ Counter enable: 0=disabled
4712 * 00 Reserved, must be 0
4713 *
4714 * 0001 0100
4715 */
4716 write_reg(info, TXDMA + DMR, 0x14);
4717 write_reg(info, RXDMA + DMR, 0x14);
4718
4719 /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4720 write_reg(info, RXDMA + CPB,
4721 (unsigned char)(info->buffer_list_phys >> 16));
4722
4723 /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4724 write_reg(info, TXDMA + CPB,
4725 (unsigned char)(info->buffer_list_phys >> 16));
4726
4727 /* enable status interrupts. other code enables/disables
4728 * the individual sources for these two interrupt classes.
4729 */
4730 info->ie0_value |= TXINTE + RXINTE;
4731 write_reg(info, IE0, info->ie0_value);
4732
4733 /* CTL, MSCI control register
4734 *
4735 * 07..06 Reserved, set to 0
4736 * 05 UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4737 * 04 IDLC, idle control, 0=mark 1=idle register
4738 * 03 BRK, break, 0=off 1 =on (async)
4739 * 02 SYNCLD, sync char load enable (BSC) 1=enabled
4740 * 01 GOP, go active on poll (LOOP mode) 1=enabled
4741 * 00 RTS, RTS output control, 0=active 1=inactive
4742 *
4743 * 0001 0001
4744 */
4745 RegValue = 0x10;
4746 if (!(info->serial_signals & SerialSignal_RTS))
4747 RegValue |= 0x01;
4748 write_reg(info, CTL, RegValue);
4749
4750 /* preamble not supported ! */
4751
4752 tx_set_idle(info);
4753 tx_stop(info);
4754 rx_stop(info);
4755
4756 set_rate(info, info->params.clock_speed);
4757
4758 if (info->params.loopback)
4759 enable_loopback(info,1);
4760 }
4761
4762 /* Set the transmit HDLC idle mode
4763 */
4764 static void tx_set_idle(SLMP_INFO *info)
4765 {
4766 unsigned char RegValue = 0xff;
4767
4768 /* Map API idle mode to SCA register bits */
4769 switch(info->idle_mode) {
4770 case HDLC_TXIDLE_FLAGS: RegValue = 0x7e; break;
4771 case HDLC_TXIDLE_ALT_ZEROS_ONES: RegValue = 0xaa; break;
4772 case HDLC_TXIDLE_ZEROS: RegValue = 0x00; break;
4773 case HDLC_TXIDLE_ONES: RegValue = 0xff; break;
4774 case HDLC_TXIDLE_ALT_MARK_SPACE: RegValue = 0xaa; break;
4775 case HDLC_TXIDLE_SPACE: RegValue = 0x00; break;
4776 case HDLC_TXIDLE_MARK: RegValue = 0xff; break;
4777 }
4778
4779 write_reg(info, IDL, RegValue);
4780 }
4781
4782 /* Query the adapter for the state of the V24 status (input) signals.
4783 */
4784 static void get_signals(SLMP_INFO *info)
4785 {
4786 u16 status = read_reg(info, SR3);
4787 u16 gpstatus = read_status_reg(info);
4788 u16 testbit;
4789
4790 /* clear all serial signals except DTR and RTS */
4791 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
4792
4793 /* set serial signal bits to reflect MISR */
4794
4795 if (!(status & BIT3))
4796 info->serial_signals |= SerialSignal_CTS;
4797
4798 if ( !(status & BIT2))
4799 info->serial_signals |= SerialSignal_DCD;
4800
4801 testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4802 if (!(gpstatus & testbit))
4803 info->serial_signals |= SerialSignal_RI;
4804
4805 testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4806 if (!(gpstatus & testbit))
4807 info->serial_signals |= SerialSignal_DSR;
4808 }
4809
4810 /* Set the state of DTR and RTS based on contents of
4811 * serial_signals member of device context.
4812 */
4813 static void set_signals(SLMP_INFO *info)
4814 {
4815 unsigned char RegValue;
4816 u16 EnableBit;
4817
4818 RegValue = read_reg(info, CTL);
4819 if (info->serial_signals & SerialSignal_RTS)
4820 RegValue &= ~BIT0;
4821 else
4822 RegValue |= BIT0;
4823 write_reg(info, CTL, RegValue);
4824
4825 // Port 0..3 DTR is ctrl reg <1,3,5,7>
4826 EnableBit = BIT1 << (info->port_num*2);
4827 if (info->serial_signals & SerialSignal_DTR)
4828 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4829 else
4830 info->port_array[0]->ctrlreg_value |= EnableBit;
4831 write_control_reg(info);
4832 }
4833
4834 /*******************/
4835 /* DMA Buffer Code */
4836 /*******************/
4837
4838 /* Set the count for all receive buffers to SCABUFSIZE
4839 * and set the current buffer to the first buffer. This effectively
4840 * makes all buffers free and discards any data in buffers.
4841 */
4842 static void rx_reset_buffers(SLMP_INFO *info)
4843 {
4844 rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4845 }
4846
4847 /* Free the buffers used by a received frame
4848 *
4849 * info pointer to device instance data
4850 * first index of 1st receive buffer of frame
4851 * last index of last receive buffer of frame
4852 */
4853 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4854 {
4855 bool done = false;
4856
4857 while(!done) {
4858 /* reset current buffer for reuse */
4859 info->rx_buf_list[first].status = 0xff;
4860
4861 if (first == last) {
4862 done = true;
4863 /* set new last rx descriptor address */
4864 write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4865 }
4866
4867 first++;
4868 if (first == info->rx_buf_count)
4869 first = 0;
4870 }
4871
4872 /* set current buffer to next buffer after last buffer of frame */
4873 info->current_rx_buf = first;
4874 }
4875
4876 /* Return a received frame from the receive DMA buffers.
4877 * Only frames received without errors are returned.
4878 *
4879 * Return Value: true if frame returned, otherwise false
4880 */
4881 static bool rx_get_frame(SLMP_INFO *info)
4882 {
4883 unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
4884 unsigned short status;
4885 unsigned int framesize = 0;
4886 bool ReturnCode = false;
4887 unsigned long flags;
4888 struct tty_struct *tty = info->tty;
4889 unsigned char addr_field = 0xff;
4890 SCADESC *desc;
4891 SCADESC_EX *desc_ex;
4892
4893 CheckAgain:
4894 /* assume no frame returned, set zero length */
4895 framesize = 0;
4896 addr_field = 0xff;
4897
4898 /*
4899 * current_rx_buf points to the 1st buffer of the next available
4900 * receive frame. To find the last buffer of the frame look for
4901 * a non-zero status field in the buffer entries. (The status
4902 * field is set by the 16C32 after completing a receive frame.
4903 */
4904 StartIndex = EndIndex = info->current_rx_buf;
4905
4906 for ( ;; ) {
4907 desc = &info->rx_buf_list[EndIndex];
4908 desc_ex = &info->rx_buf_list_ex[EndIndex];
4909
4910 if (desc->status == 0xff)
4911 goto Cleanup; /* current desc still in use, no frames available */
4912
4913 if (framesize == 0 && info->params.addr_filter != 0xff)
4914 addr_field = desc_ex->virt_addr[0];
4915
4916 framesize += desc->length;
4917
4918 /* Status != 0 means last buffer of frame */
4919 if (desc->status)
4920 break;
4921
4922 EndIndex++;
4923 if (EndIndex == info->rx_buf_count)
4924 EndIndex = 0;
4925
4926 if (EndIndex == info->current_rx_buf) {
4927 /* all buffers have been 'used' but none mark */
4928 /* the end of a frame. Reset buffers and receiver. */
4929 if ( info->rx_enabled ){
4930 spin_lock_irqsave(&info->lock,flags);
4931 rx_start(info);
4932 spin_unlock_irqrestore(&info->lock,flags);
4933 }
4934 goto Cleanup;
4935 }
4936
4937 }
4938
4939 /* check status of receive frame */
4940
4941 /* frame status is byte stored after frame data
4942 *
4943 * 7 EOM (end of msg), 1 = last buffer of frame
4944 * 6 Short Frame, 1 = short frame
4945 * 5 Abort, 1 = frame aborted
4946 * 4 Residue, 1 = last byte is partial
4947 * 3 Overrun, 1 = overrun occurred during frame reception
4948 * 2 CRC, 1 = CRC error detected
4949 *
4950 */
4951 status = desc->status;
4952
4953 /* ignore CRC bit if not using CRC (bit is undefined) */
4954 /* Note:CRC is not save to data buffer */
4955 if (info->params.crc_type == HDLC_CRC_NONE)
4956 status &= ~BIT2;
4957
4958 if (framesize == 0 ||
4959 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4960 /* discard 0 byte frames, this seems to occur sometime
4961 * when remote is idling flags.
4962 */
4963 rx_free_frame_buffers(info, StartIndex, EndIndex);
4964 goto CheckAgain;
4965 }
4966
4967 if (framesize < 2)
4968 status |= BIT6;
4969
4970 if (status & (BIT6+BIT5+BIT3+BIT2)) {
4971 /* received frame has errors,
4972 * update counts and mark frame size as 0
4973 */
4974 if (status & BIT6)
4975 info->icount.rxshort++;
4976 else if (status & BIT5)
4977 info->icount.rxabort++;
4978 else if (status & BIT3)
4979 info->icount.rxover++;
4980 else
4981 info->icount.rxcrc++;
4982
4983 framesize = 0;
4984 #if SYNCLINK_GENERIC_HDLC
4985 {
4986 struct net_device_stats *stats = hdlc_stats(info->netdev);
4987 stats->rx_errors++;
4988 stats->rx_frame_errors++;
4989 }
4990 #endif
4991 }
4992
4993 if ( debug_level >= DEBUG_LEVEL_BH )
4994 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4995 __FILE__,__LINE__,info->device_name,status,framesize);
4996
4997 if ( debug_level >= DEBUG_LEVEL_DATA )
4998 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
4999 min_t(int, framesize,SCABUFSIZE),0);
5000
5001 if (framesize) {
5002 if (framesize > info->max_frame_size)
5003 info->icount.rxlong++;
5004 else {
5005 /* copy dma buffer(s) to contiguous intermediate buffer */
5006 int copy_count = framesize;
5007 int index = StartIndex;
5008 unsigned char *ptmp = info->tmp_rx_buf;
5009 info->tmp_rx_buf_count = framesize;
5010
5011 info->icount.rxok++;
5012
5013 while(copy_count) {
5014 int partial_count = min(copy_count,SCABUFSIZE);
5015 memcpy( ptmp,
5016 info->rx_buf_list_ex[index].virt_addr,
5017 partial_count );
5018 ptmp += partial_count;
5019 copy_count -= partial_count;
5020
5021 if ( ++index == info->rx_buf_count )
5022 index = 0;
5023 }
5024
5025 #if SYNCLINK_GENERIC_HDLC
5026 if (info->netcount)
5027 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
5028 else
5029 #endif
5030 ldisc_receive_buf(tty,info->tmp_rx_buf,
5031 info->flag_buf, framesize);
5032 }
5033 }
5034 /* Free the buffers used by this frame. */
5035 rx_free_frame_buffers( info, StartIndex, EndIndex );
5036
5037 ReturnCode = true;
5038
5039 Cleanup:
5040 if ( info->rx_enabled && info->rx_overflow ) {
5041 /* Receiver is enabled, but needs to restarted due to
5042 * rx buffer overflow. If buffers are empty, restart receiver.
5043 */
5044 if (info->rx_buf_list[EndIndex].status == 0xff) {
5045 spin_lock_irqsave(&info->lock,flags);
5046 rx_start(info);
5047 spin_unlock_irqrestore(&info->lock,flags);
5048 }
5049 }
5050
5051 return ReturnCode;
5052 }
5053
5054 /* load the transmit DMA buffer with data
5055 */
5056 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5057 {
5058 unsigned short copy_count;
5059 unsigned int i = 0;
5060 SCADESC *desc;
5061 SCADESC_EX *desc_ex;
5062
5063 if ( debug_level >= DEBUG_LEVEL_DATA )
5064 trace_block(info,buf, min_t(int, count,SCABUFSIZE), 1);
5065
5066 /* Copy source buffer to one or more DMA buffers, starting with
5067 * the first transmit dma buffer.
5068 */
5069 for(i=0;;)
5070 {
5071 copy_count = min_t(unsigned short,count,SCABUFSIZE);
5072
5073 desc = &info->tx_buf_list[i];
5074 desc_ex = &info->tx_buf_list_ex[i];
5075
5076 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5077
5078 desc->length = copy_count;
5079 desc->status = 0;
5080
5081 buf += copy_count;
5082 count -= copy_count;
5083
5084 if (!count)
5085 break;
5086
5087 i++;
5088 if (i >= info->tx_buf_count)
5089 i = 0;
5090 }
5091
5092 info->tx_buf_list[i].status = 0x81; /* set EOM and EOT status */
5093 info->last_tx_buf = ++i;
5094 }
5095
5096 static bool register_test(SLMP_INFO *info)
5097 {
5098 static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5099 static unsigned int count = ARRAY_SIZE(testval);
5100 unsigned int i;
5101 bool rc = true;
5102 unsigned long flags;
5103
5104 spin_lock_irqsave(&info->lock,flags);
5105 reset_port(info);
5106
5107 /* assume failure */
5108 info->init_error = DiagStatus_AddressFailure;
5109
5110 /* Write bit patterns to various registers but do it out of */
5111 /* sync, then read back and verify values. */
5112
5113 for (i = 0 ; i < count ; i++) {
5114 write_reg(info, TMC, testval[i]);
5115 write_reg(info, IDL, testval[(i+1)%count]);
5116 write_reg(info, SA0, testval[(i+2)%count]);
5117 write_reg(info, SA1, testval[(i+3)%count]);
5118
5119 if ( (read_reg(info, TMC) != testval[i]) ||
5120 (read_reg(info, IDL) != testval[(i+1)%count]) ||
5121 (read_reg(info, SA0) != testval[(i+2)%count]) ||
5122 (read_reg(info, SA1) != testval[(i+3)%count]) )
5123 {
5124 rc = false;
5125 break;
5126 }
5127 }
5128
5129 reset_port(info);
5130 spin_unlock_irqrestore(&info->lock,flags);
5131
5132 return rc;
5133 }
5134
5135 static bool irq_test(SLMP_INFO *info)
5136 {
5137 unsigned long timeout;
5138 unsigned long flags;
5139
5140 unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5141
5142 spin_lock_irqsave(&info->lock,flags);
5143 reset_port(info);
5144
5145 /* assume failure */
5146 info->init_error = DiagStatus_IrqFailure;
5147 info->irq_occurred = false;
5148
5149 /* setup timer0 on SCA0 to interrupt */
5150
5151 /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5152 write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5153
5154 write_reg(info, (unsigned char)(timer + TEPR), 0); /* timer expand prescale */
5155 write_reg16(info, (unsigned char)(timer + TCONR), 1); /* timer constant */
5156
5157
5158 /* TMCS, Timer Control/Status Register
5159 *
5160 * 07 CMF, Compare match flag (read only) 1=match
5161 * 06 ECMI, CMF Interrupt Enable: 1=enabled
5162 * 05 Reserved, must be 0
5163 * 04 TME, Timer Enable
5164 * 03..00 Reserved, must be 0
5165 *
5166 * 0101 0000
5167 */
5168 write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5169
5170 spin_unlock_irqrestore(&info->lock,flags);
5171
5172 timeout=100;
5173 while( timeout-- && !info->irq_occurred ) {
5174 msleep_interruptible(10);
5175 }
5176
5177 spin_lock_irqsave(&info->lock,flags);
5178 reset_port(info);
5179 spin_unlock_irqrestore(&info->lock,flags);
5180
5181 return info->irq_occurred;
5182 }
5183
5184 /* initialize individual SCA device (2 ports)
5185 */
5186 static bool sca_init(SLMP_INFO *info)
5187 {
5188 /* set wait controller to single mem partition (low), no wait states */
5189 write_reg(info, PABR0, 0); /* wait controller addr boundary 0 */
5190 write_reg(info, PABR1, 0); /* wait controller addr boundary 1 */
5191 write_reg(info, WCRL, 0); /* wait controller low range */
5192 write_reg(info, WCRM, 0); /* wait controller mid range */
5193 write_reg(info, WCRH, 0); /* wait controller high range */
5194
5195 /* DPCR, DMA Priority Control
5196 *
5197 * 07..05 Not used, must be 0
5198 * 04 BRC, bus release condition: 0=all transfers complete
5199 * 03 CCC, channel change condition: 0=every cycle
5200 * 02..00 PR<2..0>, priority 100=round robin
5201 *
5202 * 00000100 = 0x04
5203 */
5204 write_reg(info, DPCR, dma_priority);
5205
5206 /* DMA Master Enable, BIT7: 1=enable all channels */
5207 write_reg(info, DMER, 0x80);
5208
5209 /* enable all interrupt classes */
5210 write_reg(info, IER0, 0xff); /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5211 write_reg(info, IER1, 0xff); /* DMIB,DMIA (channels 0-3) */
5212 write_reg(info, IER2, 0xf0); /* TIRQ (timers 0-3) */
5213
5214 /* ITCR, interrupt control register
5215 * 07 IPC, interrupt priority, 0=MSCI->DMA
5216 * 06..05 IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5217 * 04 VOS, Vector Output, 0=unmodified vector
5218 * 03..00 Reserved, must be 0
5219 */
5220 write_reg(info, ITCR, 0);
5221
5222 return true;
5223 }
5224
5225 /* initialize adapter hardware
5226 */
5227 static bool init_adapter(SLMP_INFO *info)
5228 {
5229 int i;
5230
5231 /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5232 volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5233 u32 readval;
5234
5235 info->misc_ctrl_value |= BIT30;
5236 *MiscCtrl = info->misc_ctrl_value;
5237
5238 /*
5239 * Force at least 170ns delay before clearing
5240 * reset bit. Each read from LCR takes at least
5241 * 30ns so 10 times for 300ns to be safe.
5242 */
5243 for(i=0;i<10;i++)
5244 readval = *MiscCtrl;
5245
5246 info->misc_ctrl_value &= ~BIT30;
5247 *MiscCtrl = info->misc_ctrl_value;
5248
5249 /* init control reg (all DTRs off, all clksel=input) */
5250 info->ctrlreg_value = 0xaa;
5251 write_control_reg(info);
5252
5253 {
5254 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5255 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5256
5257 switch(read_ahead_count)
5258 {
5259 case 16:
5260 lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5261 break;
5262 case 8:
5263 lcr1_brdr_value |= BIT5 + BIT4;
5264 break;
5265 case 4:
5266 lcr1_brdr_value |= BIT5 + BIT3;
5267 break;
5268 case 0:
5269 lcr1_brdr_value |= BIT5;
5270 break;
5271 }
5272
5273 *LCR1BRDR = lcr1_brdr_value;
5274 *MiscCtrl = misc_ctrl_value;
5275 }
5276
5277 sca_init(info->port_array[0]);
5278 sca_init(info->port_array[2]);
5279
5280 return true;
5281 }
5282
5283 /* Loopback an HDLC frame to test the hardware
5284 * interrupt and DMA functions.
5285 */
5286 static bool loopback_test(SLMP_INFO *info)
5287 {
5288 #define TESTFRAMESIZE 20
5289
5290 unsigned long timeout;
5291 u16 count = TESTFRAMESIZE;
5292 unsigned char buf[TESTFRAMESIZE];
5293 bool rc = false;
5294 unsigned long flags;
5295
5296 struct tty_struct *oldtty = info->tty;
5297 u32 speed = info->params.clock_speed;
5298
5299 info->params.clock_speed = 3686400;
5300 info->tty = NULL;
5301
5302 /* assume failure */
5303 info->init_error = DiagStatus_DmaFailure;
5304
5305 /* build and send transmit frame */
5306 for (count = 0; count < TESTFRAMESIZE;++count)
5307 buf[count] = (unsigned char)count;
5308
5309 memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5310
5311 /* program hardware for HDLC and enabled receiver */
5312 spin_lock_irqsave(&info->lock,flags);
5313 hdlc_mode(info);
5314 enable_loopback(info,1);
5315 rx_start(info);
5316 info->tx_count = count;
5317 tx_load_dma_buffer(info,buf,count);
5318 tx_start(info);
5319 spin_unlock_irqrestore(&info->lock,flags);
5320
5321 /* wait for receive complete */
5322 /* Set a timeout for waiting for interrupt. */
5323 for ( timeout = 100; timeout; --timeout ) {
5324 msleep_interruptible(10);
5325
5326 if (rx_get_frame(info)) {
5327 rc = true;
5328 break;
5329 }
5330 }
5331
5332 /* verify received frame length and contents */
5333 if (rc &&
5334 ( info->tmp_rx_buf_count != count ||
5335 memcmp(buf, info->tmp_rx_buf,count))) {
5336 rc = false;
5337 }
5338
5339 spin_lock_irqsave(&info->lock,flags);
5340 reset_adapter(info);
5341 spin_unlock_irqrestore(&info->lock,flags);
5342
5343 info->params.clock_speed = speed;
5344 info->tty = oldtty;
5345
5346 return rc;
5347 }
5348
5349 /* Perform diagnostics on hardware
5350 */
5351 static int adapter_test( SLMP_INFO *info )
5352 {
5353 unsigned long flags;
5354 if ( debug_level >= DEBUG_LEVEL_INFO )
5355 printk( "%s(%d):Testing device %s\n",
5356 __FILE__,__LINE__,info->device_name );
5357
5358 spin_lock_irqsave(&info->lock,flags);
5359 init_adapter(info);
5360 spin_unlock_irqrestore(&info->lock,flags);
5361
5362 info->port_array[0]->port_count = 0;
5363
5364 if ( register_test(info->port_array[0]) &&
5365 register_test(info->port_array[1])) {
5366
5367 info->port_array[0]->port_count = 2;
5368
5369 if ( register_test(info->port_array[2]) &&
5370 register_test(info->port_array[3]) )
5371 info->port_array[0]->port_count += 2;
5372 }
5373 else {
5374 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5375 __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5376 return -ENODEV;
5377 }
5378
5379 if ( !irq_test(info->port_array[0]) ||
5380 !irq_test(info->port_array[1]) ||
5381 (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5382 (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5383 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5384 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5385 return -ENODEV;
5386 }
5387
5388 if (!loopback_test(info->port_array[0]) ||
5389 !loopback_test(info->port_array[1]) ||
5390 (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5391 (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5392 printk( "%s(%d):DMA test failure for device %s\n",
5393 __FILE__,__LINE__,info->device_name);
5394 return -ENODEV;
5395 }
5396
5397 if ( debug_level >= DEBUG_LEVEL_INFO )
5398 printk( "%s(%d):device %s passed diagnostics\n",
5399 __FILE__,__LINE__,info->device_name );
5400
5401 info->port_array[0]->init_error = 0;
5402 info->port_array[1]->init_error = 0;
5403 if ( info->port_count > 2 ) {
5404 info->port_array[2]->init_error = 0;
5405 info->port_array[3]->init_error = 0;
5406 }
5407
5408 return 0;
5409 }
5410
5411 /* Test the shared memory on a PCI adapter.
5412 */
5413 static bool memory_test(SLMP_INFO *info)
5414 {
5415 static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5416 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5417 unsigned long count = ARRAY_SIZE(testval);
5418 unsigned long i;
5419 unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5420 unsigned long * addr = (unsigned long *)info->memory_base;
5421
5422 /* Test data lines with test pattern at one location. */
5423
5424 for ( i = 0 ; i < count ; i++ ) {
5425 *addr = testval[i];
5426 if ( *addr != testval[i] )
5427 return false;
5428 }
5429
5430 /* Test address lines with incrementing pattern over */
5431 /* entire address range. */
5432
5433 for ( i = 0 ; i < limit ; i++ ) {
5434 *addr = i * 4;
5435 addr++;
5436 }
5437
5438 addr = (unsigned long *)info->memory_base;
5439
5440 for ( i = 0 ; i < limit ; i++ ) {
5441 if ( *addr != i * 4 )
5442 return false;
5443 addr++;
5444 }
5445
5446 memset( info->memory_base, 0, SCA_MEM_SIZE );
5447 return true;
5448 }
5449
5450 /* Load data into PCI adapter shared memory.
5451 *
5452 * The PCI9050 releases control of the local bus
5453 * after completing the current read or write operation.
5454 *
5455 * While the PCI9050 write FIFO not empty, the
5456 * PCI9050 treats all of the writes as a single transaction
5457 * and does not release the bus. This causes DMA latency problems
5458 * at high speeds when copying large data blocks to the shared memory.
5459 *
5460 * This function breaks a write into multiple transations by
5461 * interleaving a read which flushes the write FIFO and 'completes'
5462 * the write transation. This allows any pending DMA request to gain control
5463 * of the local bus in a timely fasion.
5464 */
5465 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5466 {
5467 /* A load interval of 16 allows for 4 32-bit writes at */
5468 /* 136ns each for a maximum latency of 542ns on the local bus.*/
5469
5470 unsigned short interval = count / sca_pci_load_interval;
5471 unsigned short i;
5472
5473 for ( i = 0 ; i < interval ; i++ )
5474 {
5475 memcpy(dest, src, sca_pci_load_interval);
5476 read_status_reg(info);
5477 dest += sca_pci_load_interval;
5478 src += sca_pci_load_interval;
5479 }
5480
5481 memcpy(dest, src, count % sca_pci_load_interval);
5482 }
5483
5484 static void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5485 {
5486 int i;
5487 int linecount;
5488 if (xmit)
5489 printk("%s tx data:\n",info->device_name);
5490 else
5491 printk("%s rx data:\n",info->device_name);
5492
5493 while(count) {
5494 if (count > 16)
5495 linecount = 16;
5496 else
5497 linecount = count;
5498
5499 for(i=0;i<linecount;i++)
5500 printk("%02X ",(unsigned char)data[i]);
5501 for(;i<17;i++)
5502 printk(" ");
5503 for(i=0;i<linecount;i++) {
5504 if (data[i]>=040 && data[i]<=0176)
5505 printk("%c",data[i]);
5506 else
5507 printk(".");
5508 }
5509 printk("\n");
5510
5511 data += linecount;
5512 count -= linecount;
5513 }
5514 } /* end of trace_block() */
5515
5516 /* called when HDLC frame times out
5517 * update stats and do tx completion processing
5518 */
5519 static void tx_timeout(unsigned long context)
5520 {
5521 SLMP_INFO *info = (SLMP_INFO*)context;
5522 unsigned long flags;
5523
5524 if ( debug_level >= DEBUG_LEVEL_INFO )
5525 printk( "%s(%d):%s tx_timeout()\n",
5526 __FILE__,__LINE__,info->device_name);
5527 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5528 info->icount.txtimeout++;
5529 }
5530 spin_lock_irqsave(&info->lock,flags);
5531 info->tx_active = false;
5532 info->tx_count = info->tx_put = info->tx_get = 0;
5533
5534 spin_unlock_irqrestore(&info->lock,flags);
5535
5536 #if SYNCLINK_GENERIC_HDLC
5537 if (info->netcount)
5538 hdlcdev_tx_done(info);
5539 else
5540 #endif
5541 bh_transmit(info);
5542 }
5543
5544 /* called to periodically check the DSR/RI modem signal input status
5545 */
5546 static void status_timeout(unsigned long context)
5547 {
5548 u16 status = 0;
5549 SLMP_INFO *info = (SLMP_INFO*)context;
5550 unsigned long flags;
5551 unsigned char delta;
5552
5553
5554 spin_lock_irqsave(&info->lock,flags);
5555 get_signals(info);
5556 spin_unlock_irqrestore(&info->lock,flags);
5557
5558 /* check for DSR/RI state change */
5559
5560 delta = info->old_signals ^ info->serial_signals;
5561 info->old_signals = info->serial_signals;
5562
5563 if (delta & SerialSignal_DSR)
5564 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5565
5566 if (delta & SerialSignal_RI)
5567 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5568
5569 if (delta & SerialSignal_DCD)
5570 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5571
5572 if (delta & SerialSignal_CTS)
5573 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5574
5575 if (status)
5576 isr_io_pin(info,status);
5577
5578 mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
5579 }
5580
5581
5582 /* Register Access Routines -
5583 * All registers are memory mapped
5584 */
5585 #define CALC_REGADDR() \
5586 unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5587 if (info->port_num > 1) \
5588 RegAddr += 256; /* port 0-1 SCA0, 2-3 SCA1 */ \
5589 if ( info->port_num & 1) { \
5590 if (Addr > 0x7f) \
5591 RegAddr += 0x40; /* DMA access */ \
5592 else if (Addr > 0x1f && Addr < 0x60) \
5593 RegAddr += 0x20; /* MSCI access */ \
5594 }
5595
5596
5597 static unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5598 {
5599 CALC_REGADDR();
5600 return *RegAddr;
5601 }
5602 static void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5603 {
5604 CALC_REGADDR();
5605 *RegAddr = Value;
5606 }
5607
5608 static u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5609 {
5610 CALC_REGADDR();
5611 return *((u16 *)RegAddr);
5612 }
5613
5614 static void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5615 {
5616 CALC_REGADDR();
5617 *((u16 *)RegAddr) = Value;
5618 }
5619
5620 static unsigned char read_status_reg(SLMP_INFO * info)
5621 {
5622 unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5623 return *RegAddr;
5624 }
5625
5626 static void write_control_reg(SLMP_INFO * info)
5627 {
5628 unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5629 *RegAddr = info->port_array[0]->ctrlreg_value;
5630 }
5631
5632
5633 static int __devinit synclinkmp_init_one (struct pci_dev *dev,
5634 const struct pci_device_id *ent)
5635 {
5636 if (pci_enable_device(dev)) {
5637 printk("error enabling pci device %p\n", dev);
5638 return -EIO;
5639 }
5640 device_init( ++synclinkmp_adapter_count, dev );
5641 return 0;
5642 }
5643
5644 static void __devexit synclinkmp_remove_one (struct pci_dev *dev)
5645 {
5646 }
Linux 2.6 libata-dev (mirror)