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[POWERPC] PS3: Kexec support
[linux-2.6/mini2440.git] / drivers / char / serial167.c
blobc585b4738f86c2b670a46e54c4b5a154a2c5ed5d
1 /*
2 * linux/drivers/char/serial167.c
3 *
4 * Driver for MVME166/7 board serial ports, which are via a CD2401.
5 * Based very much on cyclades.c.
6 *
7 * MVME166/7 work by Richard Hirst [richard@sleepie.demon.co.uk]
8 *
9 * ==============================================================
10 *
11 * static char rcsid[] =
12 * "$Revision: 1.36.1.4 $$Date: 1995/03/29 06:14:14 $";
13 *
14 * linux/kernel/cyclades.c
15 *
16 * Maintained by Marcio Saito (cyclades@netcom.com) and
17 * Randolph Bentson (bentson@grieg.seaslug.org)
18 *
19 * Much of the design and some of the code came from serial.c
20 * which was copyright (C) 1991, 1992 Linus Torvalds. It was
21 * extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92,
22 * and then fixed as suggested by Michael K. Johnson 12/12/92.
23 *
24 * This version does not support shared irq's.
25 *
26 * $Log: cyclades.c,v $
27 * Revision 1.36.1.4 1995/03/29 06:14:14 bentson
28 * disambiguate between Cyclom-16Y and Cyclom-32Ye;
29 *
30 * Changes:
31 *
32 * 200 lines of changes record removed - RGH 11-10-95, starting work on
33 * converting this to drive serial ports on mvme166 (cd2401).
34 *
35 * Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 2000/08/25
36 * - get rid of verify_area
37 * - use get_user to access memory from userspace in set_threshold,
38 * set_default_threshold and set_timeout
39 * - don't use the panic function in serial167_init
40 * - do resource release on failure on serial167_init
41 * - include missing restore_flags in mvme167_serial_console_setup
42 *
43 * Kars de Jong <jongk@linux-m68k.org> - 2004/09/06
44 * - replace bottom half handler with task queue handler
45 */
46
47 #include <linux/errno.h>
48 #include <linux/signal.h>
49 #include <linux/sched.h>
50 #include <linux/timer.h>
51 #include <linux/tty.h>
52 #include <linux/interrupt.h>
53 #include <linux/serial.h>
54 #include <linux/serialP.h>
55 #include <linux/string.h>
56 #include <linux/fcntl.h>
57 #include <linux/ptrace.h>
58 #include <linux/serial167.h>
59 #include <linux/delay.h>
60 #include <linux/major.h>
61 #include <linux/mm.h>
62 #include <linux/console.h>
63 #include <linux/module.h>
64 #include <linux/bitops.h>
65 #include <linux/tty_flip.h>
66
67 #include <asm/system.h>
68 #include <asm/io.h>
69 #include <asm/mvme16xhw.h>
70 #include <asm/bootinfo.h>
71 #include <asm/setup.h>
72
73 #include <linux/types.h>
74 #include <linux/kernel.h>
75
76 #include <asm/uaccess.h>
77 #include <linux/init.h>
78
79 #define SERIAL_PARANOIA_CHECK
80 #undef SERIAL_DEBUG_OPEN
81 #undef SERIAL_DEBUG_THROTTLE
82 #undef SERIAL_DEBUG_OTHER
83 #undef SERIAL_DEBUG_IO
84 #undef SERIAL_DEBUG_COUNT
85 #undef SERIAL_DEBUG_DTR
86 #undef CYCLOM_16Y_HACK
87 #define CYCLOM_ENABLE_MONITORING
88
89 #define WAKEUP_CHARS 256
90
91 #define STD_COM_FLAGS (0)
92
93 #define SERIAL_TYPE_NORMAL 1
94
95 static struct tty_driver *cy_serial_driver;
96 extern int serial_console;
97 static struct cyclades_port *serial_console_info = NULL;
98 static unsigned int serial_console_cflag = 0;
99 u_char initial_console_speed;
100
101 /* Base address of cd2401 chip on mvme166/7 */
102
103 #define BASE_ADDR (0xfff45000)
104 #define pcc2chip ((volatile u_char *)0xfff42000)
105 #define PccSCCMICR 0x1d
106 #define PccSCCTICR 0x1e
107 #define PccSCCRICR 0x1f
108 #define PccTPIACKR 0x25
109 #define PccRPIACKR 0x27
110 #define PccIMLR 0x3f
111
112 /* This is the per-port data structure */
113 struct cyclades_port cy_port[] = {
114 /* CARD# */
115 {-1}, /* ttyS0 */
116 {-1}, /* ttyS1 */
117 {-1}, /* ttyS2 */
118 {-1}, /* ttyS3 */
119 };
120
121 #define NR_PORTS ARRAY_SIZE(cy_port)
122
123 /*
124 * This is used to look up the divisor speeds and the timeouts
125 * We're normally limited to 15 distinct baud rates. The extra
126 * are accessed via settings in info->flags.
127 * 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
128 * 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
129 * HI VHI
130 */
131 static int baud_table[] = {
132 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200,
133 1800, 2400, 4800, 9600, 19200, 38400, 57600, 76800, 115200, 150000,
134 0
135 };
136
137 #if 0
138 static char baud_co[] = { /* 25 MHz clock option table */
139 /* value => 00 01 02 03 04 */
140 /* divide by 8 32 128 512 2048 */
141 0x00, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03, 0x03, 0x03, 0x02,
142 0x02, 0x02, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
143 };
144
145 static char baud_bpr[] = { /* 25 MHz baud rate period table */
146 0x00, 0xf5, 0xa3, 0x6f, 0x5c, 0x51, 0xf5, 0xa3, 0x51, 0xa3,
147 0x6d, 0x51, 0xa3, 0x51, 0xa3, 0x51, 0x36, 0x29, 0x1b, 0x15
148 };
149 #endif
150
151 /* I think 166 brd clocks 2401 at 20MHz.... */
152
153 /* These values are written directly to tcor, and >> 5 for writing to rcor */
154 static u_char baud_co[] = { /* 20 MHz clock option table */
155 0x00, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x60, 0x60, 0x40,
156 0x40, 0x40, 0x20, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
157 };
158
159 /* These values written directly to tbpr/rbpr */
160 static u_char baud_bpr[] = { /* 20 MHz baud rate period table */
161 0x00, 0xc0, 0x80, 0x58, 0x6c, 0x40, 0xc0, 0x81, 0x40, 0x81,
162 0x57, 0x40, 0x81, 0x40, 0x81, 0x40, 0x2b, 0x20, 0x15, 0x10
163 };
164
165 static u_char baud_cor4[] = { /* receive threshold */
166 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a,
167 0x0a, 0x0a, 0x0a, 0x09, 0x09, 0x08, 0x08, 0x08, 0x08, 0x07
168 };
169
170 static void shutdown(struct cyclades_port *);
171 static int startup(struct cyclades_port *);
172 static void cy_throttle(struct tty_struct *);
173 static void cy_unthrottle(struct tty_struct *);
174 static void config_setup(struct cyclades_port *);
175 extern void console_print(const char *);
176 #ifdef CYCLOM_SHOW_STATUS
177 static void show_status(int);
178 #endif
179
180 #ifdef CONFIG_REMOTE_DEBUG
181 static void debug_setup(void);
182 void queueDebugChar(int c);
183 int getDebugChar(void);
184
185 #define DEBUG_PORT 1
186 #define DEBUG_LEN 256
187
188 typedef struct {
189 int in;
190 int out;
191 unsigned char buf[DEBUG_LEN];
192 } debugq;
193
194 debugq debugiq;
195 #endif
196
197 /*
198 * I have my own version of udelay(), as it is needed when initialising
199 * the chip, before the delay loop has been calibrated. Should probably
200 * reference one of the vmechip2 or pccchip2 counter for an accurate
201 * delay, but this wild guess will do for now.
202 */
203
204 void my_udelay(long us)
205 {
206 u_char x;
207 volatile u_char *p = &x;
208 int i;
209
210 while (us--)
211 for (i = 100; i; i--)
212 x |= *p;
213 }
214
215 static inline int serial_paranoia_check(struct cyclades_port *info, char *name,
216 const char *routine)
217 {
218 #ifdef SERIAL_PARANOIA_CHECK
219 if (!info) {
220 printk("Warning: null cyclades_port for (%s) in %s\n", name,
221 routine);
222 return 1;
223 }
224
225 if ((long)info < (long)(&cy_port[0])
226 || (long)(&cy_port[NR_PORTS]) < (long)info) {
227 printk("Warning: cyclades_port out of range for (%s) in %s\n",
228 name, routine);
229 return 1;
230 }
231
232 if (info->magic != CYCLADES_MAGIC) {
233 printk("Warning: bad magic number for serial struct (%s) in "
234 "%s\n", name, routine);
235 return 1;
236 }
237 #endif
238 return 0;
239 } /* serial_paranoia_check */
240
241 #if 0
242 /* The following diagnostic routines allow the driver to spew
243 information on the screen, even (especially!) during interrupts.
244 */
245 void SP(char *data)
246 {
247 unsigned long flags;
248 local_irq_save(flags);
249 console_print(data);
250 local_irq_restore(flags);
251 }
252
253 char scrn[2];
254 void CP(char data)
255 {
256 unsigned long flags;
257 local_irq_save(flags);
258 scrn[0] = data;
259 console_print(scrn);
260 local_irq_restore(flags);
261 } /* CP */
262
263 void CP1(int data)
264 {
265 (data < 10) ? CP(data + '0') : CP(data + 'A' - 10);
266 } /* CP1 */
267 void CP2(int data)
268 {
269 CP1((data >> 4) & 0x0f);
270 CP1(data & 0x0f);
271 } /* CP2 */
272 void CP4(int data)
273 {
274 CP2((data >> 8) & 0xff);
275 CP2(data & 0xff);
276 } /* CP4 */
277 void CP8(long data)
278 {
279 CP4((data >> 16) & 0xffff);
280 CP4(data & 0xffff);
281 } /* CP8 */
282 #endif
283
284 /* This routine waits up to 1000 micro-seconds for the previous
285 command to the Cirrus chip to complete and then issues the
286 new command. An error is returned if the previous command
287 didn't finish within the time limit.
288 */
289 u_short write_cy_cmd(volatile u_char * base_addr, u_char cmd)
290 {
291 unsigned long flags;
292 volatile int i;
293
294 local_irq_save(flags);
295 /* Check to see that the previous command has completed */
296 for (i = 0; i < 100; i++) {
297 if (base_addr[CyCCR] == 0) {
298 break;
299 }
300 my_udelay(10L);
301 }
302 /* if the CCR never cleared, the previous command
303 didn't finish within the "reasonable time" */
304 if (i == 10) {
305 local_irq_restore(flags);
306 return (-1);
307 }
308
309 /* Issue the new command */
310 base_addr[CyCCR] = cmd;
311 local_irq_restore(flags);
312 return (0);
313 } /* write_cy_cmd */
314
315 /* cy_start and cy_stop provide software output flow control as a
316 function of XON/XOFF, software CTS, and other such stuff. */
317
318 static void cy_stop(struct tty_struct *tty)
319 {
320 struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
321 volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
322 int channel;
323 unsigned long flags;
324
325 #ifdef SERIAL_DEBUG_OTHER
326 printk("cy_stop %s\n", tty->name); /* */
327 #endif
328
329 if (serial_paranoia_check(info, tty->name, "cy_stop"))
330 return;
331
332 channel = info->line;
333
334 local_irq_save(flags);
335 base_addr[CyCAR] = (u_char) (channel); /* index channel */
336 base_addr[CyIER] &= ~(CyTxMpty | CyTxRdy);
337 local_irq_restore(flags);
338 } /* cy_stop */
339
340 static void cy_start(struct tty_struct *tty)
341 {
342 struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
343 volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
344 int channel;
345 unsigned long flags;
346
347 #ifdef SERIAL_DEBUG_OTHER
348 printk("cy_start %s\n", tty->name); /* */
349 #endif
350
351 if (serial_paranoia_check(info, tty->name, "cy_start"))
352 return;
353
354 channel = info->line;
355
356 local_irq_save(flags);
357 base_addr[CyCAR] = (u_char) (channel);
358 base_addr[CyIER] |= CyTxMpty;
359 local_irq_restore(flags);
360 } /* cy_start */
361
362 /*
363 * This routine is used by the interrupt handler to schedule
364 * processing in the software interrupt portion of the driver
365 * (also known as the "bottom half"). This can be called any
366 * number of times for any channel without harm.
367 */
368 static inline void cy_sched_event(struct cyclades_port *info, int event)
369 {
370 info->event |= 1 << event; /* remember what kind of event and who */
371 schedule_work(&info->tqueue);
372 } /* cy_sched_event */
373
374 /* The real interrupt service routines are called
375 whenever the card wants its hand held--chars
376 received, out buffer empty, modem change, etc.
377 */
378 static irqreturn_t cd2401_rxerr_interrupt(int irq, void *dev_id)
379 {
380 struct tty_struct *tty;
381 struct cyclades_port *info;
382 volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
383 unsigned char err, rfoc;
384 int channel;
385 char data;
386
387 /* determine the channel and change to that context */
388 channel = (u_short) (base_addr[CyLICR] >> 2);
389 info = &cy_port[channel];
390 info->last_active = jiffies;
391
392 if ((err = base_addr[CyRISR]) & CyTIMEOUT) {
393 /* This is a receive timeout interrupt, ignore it */
394 base_addr[CyREOIR] = CyNOTRANS;
395 return IRQ_HANDLED;
396 }
397
398 /* Read a byte of data if there is any - assume the error
399 * is associated with this character */
400
401 if ((rfoc = base_addr[CyRFOC]) != 0)
402 data = base_addr[CyRDR];
403 else
404 data = 0;
405
406 /* if there is nowhere to put the data, discard it */
407 if (info->tty == 0) {
408 base_addr[CyREOIR] = rfoc ? 0 : CyNOTRANS;
409 return IRQ_HANDLED;
410 } else { /* there is an open port for this data */
411 tty = info->tty;
412 if (err & info->ignore_status_mask) {
413 base_addr[CyREOIR] = rfoc ? 0 : CyNOTRANS;
414 return IRQ_HANDLED;
415 }
416 if (tty_buffer_request_room(tty, 1) != 0) {
417 if (err & info->read_status_mask) {
418 if (err & CyBREAK) {
419 tty_insert_flip_char(tty, data,
420 TTY_BREAK);
421 if (info->flags & ASYNC_SAK) {
422 do_SAK(tty);
423 }
424 } else if (err & CyFRAME) {
425 tty_insert_flip_char(tty, data,
426 TTY_FRAME);
427 } else if (err & CyPARITY) {
428 tty_insert_flip_char(tty, data,
429 TTY_PARITY);
430 } else if (err & CyOVERRUN) {
431 tty_insert_flip_char(tty, 0,
432 TTY_OVERRUN);
433 /*
434 If the flip buffer itself is
435 overflowing, we still loose
436 the next incoming character.
437 */
438 if (tty_buffer_request_room(tty, 1) !=
439 0) {
440 tty_insert_flip_char(tty, data,
441 TTY_FRAME);
442 }
443 /* These two conditions may imply */
444 /* a normal read should be done. */
445 /* else if(data & CyTIMEOUT) */
446 /* else if(data & CySPECHAR) */
447 } else {
448 tty_insert_flip_char(tty, 0,
449 TTY_NORMAL);
450 }
451 } else {
452 tty_insert_flip_char(tty, data, TTY_NORMAL);
453 }
454 } else {
455 /* there was a software buffer overrun
456 and nothing could be done about it!!! */
457 }
458 }
459 tty_schedule_flip(tty);
460 /* end of service */
461 base_addr[CyREOIR] = rfoc ? 0 : CyNOTRANS;
462 return IRQ_HANDLED;
463 } /* cy_rxerr_interrupt */
464
465 static irqreturn_t cd2401_modem_interrupt(int irq, void *dev_id)
466 {
467 struct cyclades_port *info;
468 volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
469 int channel;
470 int mdm_change;
471 int mdm_status;
472
473 /* determine the channel and change to that context */
474 channel = (u_short) (base_addr[CyLICR] >> 2);
475 info = &cy_port[channel];
476 info->last_active = jiffies;
477
478 mdm_change = base_addr[CyMISR];
479 mdm_status = base_addr[CyMSVR1];
480
481 if (info->tty == 0) { /* nowhere to put the data, ignore it */
482 ;
483 } else {
484 if ((mdm_change & CyDCD)
485 && (info->flags & ASYNC_CHECK_CD)) {
486 if (mdm_status & CyDCD) {
487 /* CP('!'); */
488 cy_sched_event(info, Cy_EVENT_OPEN_WAKEUP);
489 } else {
490 /* CP('@'); */
491 cy_sched_event(info, Cy_EVENT_HANGUP);
492 }
493 }
494 if ((mdm_change & CyCTS)
495 && (info->flags & ASYNC_CTS_FLOW)) {
496 if (info->tty->stopped) {
497 if (mdm_status & CyCTS) {
498 /* !!! cy_start isn't used because... */
499 info->tty->stopped = 0;
500 base_addr[CyIER] |= CyTxMpty;
501 cy_sched_event(info,
502 Cy_EVENT_WRITE_WAKEUP);
503 }
504 } else {
505 if (!(mdm_status & CyCTS)) {
506 /* !!! cy_stop isn't used because... */
507 info->tty->stopped = 1;
508 base_addr[CyIER] &=
509 ~(CyTxMpty | CyTxRdy);
510 }
511 }
512 }
513 if (mdm_status & CyDSR) {
514 }
515 }
516 base_addr[CyMEOIR] = 0;
517 return IRQ_HANDLED;
518 } /* cy_modem_interrupt */
519
520 static irqreturn_t cd2401_tx_interrupt(int irq, void *dev_id)
521 {
522 struct cyclades_port *info;
523 volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
524 int channel;
525 int char_count, saved_cnt;
526 int outch;
527
528 /* determine the channel and change to that context */
529 channel = (u_short) (base_addr[CyLICR] >> 2);
530
531 #ifdef CONFIG_REMOTE_DEBUG
532 if (channel == DEBUG_PORT) {
533 panic("TxInt on debug port!!!");
534 }
535 #endif
536
537 info = &cy_port[channel];
538
539 /* validate the port number (as configured and open) */
540 if ((channel < 0) || (NR_PORTS <= channel)) {
541 base_addr[CyIER] &= ~(CyTxMpty | CyTxRdy);
542 base_addr[CyTEOIR] = CyNOTRANS;
543 return IRQ_HANDLED;
544 }
545 info->last_active = jiffies;
546 if (info->tty == 0) {
547 base_addr[CyIER] &= ~(CyTxMpty | CyTxRdy);
548 if (info->xmit_cnt < WAKEUP_CHARS) {
549 cy_sched_event(info, Cy_EVENT_WRITE_WAKEUP);
550 }
551 base_addr[CyTEOIR] = CyNOTRANS;
552 return IRQ_HANDLED;
553 }
554
555 /* load the on-chip space available for outbound data */
556 saved_cnt = char_count = base_addr[CyTFTC];
557
558 if (info->x_char) { /* send special char */
559 outch = info->x_char;
560 base_addr[CyTDR] = outch;
561 char_count--;
562 info->x_char = 0;
563 }
564
565 if (info->x_break) {
566 /* The Cirrus chip requires the "Embedded Transmit
567 Commands" of start break, delay, and end break
568 sequences to be sent. The duration of the
569 break is given in TICs, which runs at HZ
570 (typically 100) and the PPR runs at 200 Hz,
571 so the delay is duration * 200/HZ, and thus a
572 break can run from 1/100 sec to about 5/4 sec.
573 Need to check these values - RGH 141095.
574 */
575 base_addr[CyTDR] = 0; /* start break */
576 base_addr[CyTDR] = 0x81;
577 base_addr[CyTDR] = 0; /* delay a bit */
578 base_addr[CyTDR] = 0x82;
579 base_addr[CyTDR] = info->x_break * 200 / HZ;
580 base_addr[CyTDR] = 0; /* terminate break */
581 base_addr[CyTDR] = 0x83;
582 char_count -= 7;
583 info->x_break = 0;
584 }
585
586 while (char_count > 0) {
587 if (!info->xmit_cnt) {
588 base_addr[CyIER] &= ~(CyTxMpty | CyTxRdy);
589 break;
590 }
591 if (info->xmit_buf == 0) {
592 base_addr[CyIER] &= ~(CyTxMpty | CyTxRdy);
593 break;
594 }
595 if (info->tty->stopped || info->tty->hw_stopped) {
596 base_addr[CyIER] &= ~(CyTxMpty | CyTxRdy);
597 break;
598 }
599 /* Because the Embedded Transmit Commands have been
600 enabled, we must check to see if the escape
601 character, NULL, is being sent. If it is, we
602 must ensure that there is room for it to be
603 doubled in the output stream. Therefore we
604 no longer advance the pointer when the character
605 is fetched, but rather wait until after the check
606 for a NULL output character. (This is necessary
607 because there may not be room for the two chars
608 needed to send a NULL.
609 */
610 outch = info->xmit_buf[info->xmit_tail];
611 if (outch) {
612 info->xmit_cnt--;
613 info->xmit_tail = (info->xmit_tail + 1)
614 & (PAGE_SIZE - 1);
615 base_addr[CyTDR] = outch;
616 char_count--;
617 } else {
618 if (char_count > 1) {
619 info->xmit_cnt--;
620 info->xmit_tail = (info->xmit_tail + 1)
621 & (PAGE_SIZE - 1);
622 base_addr[CyTDR] = outch;
623 base_addr[CyTDR] = 0;
624 char_count--;
625 char_count--;
626 } else {
627 break;
628 }
629 }
630 }
631
632 if (info->xmit_cnt < WAKEUP_CHARS) {
633 cy_sched_event(info, Cy_EVENT_WRITE_WAKEUP);
634 }
635 base_addr[CyTEOIR] = (char_count != saved_cnt) ? 0 : CyNOTRANS;
636 return IRQ_HANDLED;
637 } /* cy_tx_interrupt */
638
639 static irqreturn_t cd2401_rx_interrupt(int irq, void *dev_id)
640 {
641 struct tty_struct *tty;
642 struct cyclades_port *info;
643 volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
644 int channel;
645 char data;
646 int char_count;
647 int save_cnt;
648 int len;
649
650 /* determine the channel and change to that context */
651 channel = (u_short) (base_addr[CyLICR] >> 2);
652 info = &cy_port[channel];
653 info->last_active = jiffies;
654 save_cnt = char_count = base_addr[CyRFOC];
655
656 #ifdef CONFIG_REMOTE_DEBUG
657 if (channel == DEBUG_PORT) {
658 while (char_count--) {
659 data = base_addr[CyRDR];
660 queueDebugChar(data);
661 }
662 } else
663 #endif
664 /* if there is nowhere to put the data, discard it */
665 if (info->tty == 0) {
666 while (char_count--) {
667 data = base_addr[CyRDR];
668 }
669 } else { /* there is an open port for this data */
670 tty = info->tty;
671 /* load # characters available from the chip */
672
673 #ifdef CYCLOM_ENABLE_MONITORING
674 ++info->mon.int_count;
675 info->mon.char_count += char_count;
676 if (char_count > info->mon.char_max)
677 info->mon.char_max = char_count;
678 info->mon.char_last = char_count;
679 #endif
680 len = tty_buffer_request_room(tty, char_count);
681 while (len--) {
682 data = base_addr[CyRDR];
683 tty_insert_flip_char(tty, data, TTY_NORMAL);
684 #ifdef CYCLOM_16Y_HACK
685 udelay(10L);
686 #endif
687 }
688 tty_schedule_flip(tty);
689 }
690 /* end of service */
691 base_addr[CyREOIR] = save_cnt ? 0 : CyNOTRANS;
692 return IRQ_HANDLED;
693 } /* cy_rx_interrupt */
694
695 /*
696 * This routine is used to handle the "bottom half" processing for the
697 * serial driver, known also the "software interrupt" processing.
698 * This processing is done at the kernel interrupt level, after the
699 * cy#/_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
700 * is where time-consuming activities which can not be done in the
701 * interrupt driver proper are done; the interrupt driver schedules
702 * them using cy_sched_event(), and they get done here.
703 *
704 * This is done through one level of indirection--the task queue.
705 * When a hardware interrupt service routine wants service by the
706 * driver's bottom half, it enqueues the appropriate tq_struct (one
707 * per port) to the keventd work queue and sets a request flag
708 * that the work queue be processed.
709 *
710 * Although this may seem unwieldy, it gives the system a way to
711 * pass an argument (in this case the pointer to the cyclades_port
712 * structure) to the bottom half of the driver. Previous kernels
713 * had to poll every port to see if that port needed servicing.
714 */
715 static void do_softint(struct work_struct *ugly_api)
716 {
717 struct cyclades_port *info =
718 container_of(ugly_api, struct cyclades_port, tqueue);
719 struct tty_struct *tty;
720
721 tty = info->tty;
722 if (!tty)
723 return;
724
725 if (test_and_clear_bit(Cy_EVENT_HANGUP, &info->event)) {
726 tty_hangup(info->tty);
727 wake_up_interruptible(&info->open_wait);
728 info->flags &= ~ASYNC_NORMAL_ACTIVE;
729 }
730 if (test_and_clear_bit(Cy_EVENT_OPEN_WAKEUP, &info->event)) {
731 wake_up_interruptible(&info->open_wait);
732 }
733 if (test_and_clear_bit(Cy_EVENT_WRITE_WAKEUP, &info->event)) {
734 tty_wakeup(tty);
735 }
736 } /* do_softint */
737
738 /* This is called whenever a port becomes active;
739 interrupts are enabled and DTR & RTS are turned on.
740 */
741 static int startup(struct cyclades_port *info)
742 {
743 unsigned long flags;
744 volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
745 int channel;
746
747 if (info->flags & ASYNC_INITIALIZED) {
748 return 0;
749 }
750
751 if (!info->type) {
752 if (info->tty) {
753 set_bit(TTY_IO_ERROR, &info->tty->flags);
754 }
755 return 0;
756 }
757 if (!info->xmit_buf) {
758 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
759 if (!info->xmit_buf) {
760 return -ENOMEM;
761 }
762 }
763
764 config_setup(info);
765
766 channel = info->line;
767
768 #ifdef SERIAL_DEBUG_OPEN
769 printk("startup channel %d\n", channel);
770 #endif
771
772 local_irq_save(flags);
773 base_addr[CyCAR] = (u_char) channel;
774 write_cy_cmd(base_addr, CyENB_RCVR | CyENB_XMTR);
775
776 base_addr[CyCAR] = (u_char) channel; /* !!! Is this needed? */
777 base_addr[CyMSVR1] = CyRTS;
778 /* CP('S');CP('1'); */
779 base_addr[CyMSVR2] = CyDTR;
780
781 #ifdef SERIAL_DEBUG_DTR
782 printk("cyc: %d: raising DTR\n", __LINE__);
783 printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1],
784 base_addr[CyMSVR2]);
785 #endif
786
787 base_addr[CyIER] |= CyRxData;
788 info->flags |= ASYNC_INITIALIZED;
789
790 if (info->tty) {
791 clear_bit(TTY_IO_ERROR, &info->tty->flags);
792 }
793 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
794
795 local_irq_restore(flags);
796
797 #ifdef SERIAL_DEBUG_OPEN
798 printk(" done\n");
799 #endif
800 return 0;
801 } /* startup */
802
803 void start_xmit(struct cyclades_port *info)
804 {
805 unsigned long flags;
806 volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
807 int channel;
808
809 channel = info->line;
810 local_irq_save(flags);
811 base_addr[CyCAR] = channel;
812 base_addr[CyIER] |= CyTxMpty;
813 local_irq_restore(flags);
814 } /* start_xmit */
815
816 /*
817 * This routine shuts down a serial port; interrupts are disabled,
818 * and DTR is dropped if the hangup on close termio flag is on.
819 */
820 static void shutdown(struct cyclades_port *info)
821 {
822 unsigned long flags;
823 volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
824 int channel;
825
826 if (!(info->flags & ASYNC_INITIALIZED)) {
827 /* CP('$'); */
828 return;
829 }
830
831 channel = info->line;
832
833 #ifdef SERIAL_DEBUG_OPEN
834 printk("shutdown channel %d\n", channel);
835 #endif
836
837 /* !!! REALLY MUST WAIT FOR LAST CHARACTER TO BE
838 SENT BEFORE DROPPING THE LINE !!! (Perhaps
839 set some flag that is read when XMTY happens.)
840 Other choices are to delay some fixed interval
841 or schedule some later processing.
842 */
843 local_irq_save(flags);
844 if (info->xmit_buf) {
845 free_page((unsigned long)info->xmit_buf);
846 info->xmit_buf = NULL;
847 }
848
849 base_addr[CyCAR] = (u_char) channel;
850 if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
851 base_addr[CyMSVR1] = 0;
852 /* CP('C');CP('1'); */
853 base_addr[CyMSVR2] = 0;
854 #ifdef SERIAL_DEBUG_DTR
855 printk("cyc: %d: dropping DTR\n", __LINE__);
856 printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1],
857 base_addr[CyMSVR2]);
858 #endif
859 }
860 write_cy_cmd(base_addr, CyDIS_RCVR);
861 /* it may be appropriate to clear _XMIT at
862 some later date (after testing)!!! */
863
864 if (info->tty) {
865 set_bit(TTY_IO_ERROR, &info->tty->flags);
866 }
867 info->flags &= ~ASYNC_INITIALIZED;
868 local_irq_restore(flags);
869
870 #ifdef SERIAL_DEBUG_OPEN
871 printk(" done\n");
872 #endif
873 } /* shutdown */
874
875 /*
876 * This routine finds or computes the various line characteristics.
877 */
878 static void config_setup(struct cyclades_port *info)
879 {
880 unsigned long flags;
881 volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
882 int channel;
883 unsigned cflag;
884 int i;
885 unsigned char ti, need_init_chan = 0;
886
887 if (!info->tty || !info->tty->termios) {
888 return;
889 }
890 if (info->line == -1) {
891 return;
892 }
893 cflag = info->tty->termios->c_cflag;
894
895 /* baud rate */
896 i = cflag & CBAUD;
897 #ifdef CBAUDEX
898 /* Starting with kernel 1.1.65, there is direct support for
899 higher baud rates. The following code supports those
900 changes. The conditional aspect allows this driver to be
901 used for earlier as well as later kernel versions. (The
902 mapping is slightly different from serial.c because there
903 is still the possibility of supporting 75 kbit/sec with
904 the Cyclades board.)
905 */
906 if (i & CBAUDEX) {
907 if (i == B57600)
908 i = 16;
909 else if (i == B115200)
910 i = 18;
911 #ifdef B78600
912 else if (i == B78600)
913 i = 17;
914 #endif
915 else
916 info->tty->termios->c_cflag &= ~CBAUDEX;
917 }
918 #endif
919 if (i == 15) {
920 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
921 i += 1;
922 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
923 i += 3;
924 }
925 /* Don't ever change the speed of the console port. It will
926 * run at the speed specified in bootinfo, or at 19.2K */
927 /* Actually, it should run at whatever speed 166Bug was using */
928 /* Note info->timeout isn't used at present */
929 if (info != serial_console_info) {
930 info->tbpr = baud_bpr[i]; /* Tx BPR */
931 info->tco = baud_co[i]; /* Tx CO */
932 info->rbpr = baud_bpr[i]; /* Rx BPR */
933 info->rco = baud_co[i] >> 5; /* Rx CO */
934 if (baud_table[i] == 134) {
935 info->timeout =
936 (info->xmit_fifo_size * HZ * 30 / 269) + 2;
937 /* get it right for 134.5 baud */
938 } else if (baud_table[i]) {
939 info->timeout =
940 (info->xmit_fifo_size * HZ * 15 / baud_table[i]) +
941 2;
942 /* this needs to be propagated into the card info */
943 } else {
944 info->timeout = 0;
945 }
946 }
947 /* By tradition (is it a standard?) a baud rate of zero
948 implies the line should be/has been closed. A bit
949 later in this routine such a test is performed. */
950
951 /* byte size and parity */
952 info->cor7 = 0;
953 info->cor6 = 0;
954 info->cor5 = 0;
955 info->cor4 = (info->default_threshold ? info->default_threshold : baud_cor4[i]); /* receive threshold */
956 /* Following two lines added 101295, RGH. */
957 /* It is obviously wrong to access CyCORx, and not info->corx here,
958 * try and remember to fix it later! */
959 channel = info->line;
960 base_addr[CyCAR] = (u_char) channel;
961 if (C_CLOCAL(info->tty)) {
962 if (base_addr[CyIER] & CyMdmCh)
963 base_addr[CyIER] &= ~CyMdmCh; /* without modem intr */
964 /* ignore 1->0 modem transitions */
965 if (base_addr[CyCOR4] & (CyDSR | CyCTS | CyDCD))
966 base_addr[CyCOR4] &= ~(CyDSR | CyCTS | CyDCD);
967 /* ignore 0->1 modem transitions */
968 if (base_addr[CyCOR5] & (CyDSR | CyCTS | CyDCD))
969 base_addr[CyCOR5] &= ~(CyDSR | CyCTS | CyDCD);
970 } else {
971 if ((base_addr[CyIER] & CyMdmCh) != CyMdmCh)
972 base_addr[CyIER] |= CyMdmCh; /* with modem intr */
973 /* act on 1->0 modem transitions */
974 if ((base_addr[CyCOR4] & (CyDSR | CyCTS | CyDCD)) !=
975 (CyDSR | CyCTS | CyDCD))
976 base_addr[CyCOR4] |= CyDSR | CyCTS | CyDCD;
977 /* act on 0->1 modem transitions */
978 if ((base_addr[CyCOR5] & (CyDSR | CyCTS | CyDCD)) !=
979 (CyDSR | CyCTS | CyDCD))
980 base_addr[CyCOR5] |= CyDSR | CyCTS | CyDCD;
981 }
982 info->cor3 = (cflag & CSTOPB) ? Cy_2_STOP : Cy_1_STOP;
983 info->cor2 = CyETC;
984 switch (cflag & CSIZE) {
985 case CS5:
986 info->cor1 = Cy_5_BITS;
987 break;
988 case CS6:
989 info->cor1 = Cy_6_BITS;
990 break;
991 case CS7:
992 info->cor1 = Cy_7_BITS;
993 break;
994 case CS8:
995 info->cor1 = Cy_8_BITS;
996 break;
997 }
998 if (cflag & PARENB) {
999 if (cflag & PARODD) {
1000 info->cor1 |= CyPARITY_O;
1001 } else {
1002 info->cor1 |= CyPARITY_E;
1003 }
1004 } else {
1005 info->cor1 |= CyPARITY_NONE;
1006 }
1007
1008 /* CTS flow control flag */
1009 #if 0
1010 /* Don't complcate matters for now! RGH 141095 */
1011 if (cflag & CRTSCTS) {
1012 info->flags |= ASYNC_CTS_FLOW;
1013 info->cor2 |= CyCtsAE;
1014 } else {
1015 info->flags &= ~ASYNC_CTS_FLOW;
1016 info->cor2 &= ~CyCtsAE;
1017 }
1018 #endif
1019 if (cflag & CLOCAL)
1020 info->flags &= ~ASYNC_CHECK_CD;
1021 else
1022 info->flags |= ASYNC_CHECK_CD;
1023
1024 /***********************************************
1025 The hardware option, CyRtsAO, presents RTS when
1026 the chip has characters to send. Since most modems
1027 use RTS as reverse (inbound) flow control, this
1028 option is not used. If inbound flow control is
1029 necessary, DTR can be programmed to provide the
1030 appropriate signals for use with a non-standard
1031 cable. Contact Marcio Saito for details.
1032 ***********************************************/
1033
1034 channel = info->line;
1035
1036 local_irq_save(flags);
1037 base_addr[CyCAR] = (u_char) channel;
1038
1039 /* CyCMR set once only in mvme167_init_serial() */
1040 if (base_addr[CyLICR] != channel << 2)
1041 base_addr[CyLICR] = channel << 2;
1042 if (base_addr[CyLIVR] != 0x5c)
1043 base_addr[CyLIVR] = 0x5c;
1044
1045 /* tx and rx baud rate */
1046
1047 if (base_addr[CyCOR1] != info->cor1)
1048 need_init_chan = 1;
1049 if (base_addr[CyTCOR] != info->tco)
1050 base_addr[CyTCOR] = info->tco;
1051 if (base_addr[CyTBPR] != info->tbpr)
1052 base_addr[CyTBPR] = info->tbpr;
1053 if (base_addr[CyRCOR] != info->rco)
1054 base_addr[CyRCOR] = info->rco;
1055 if (base_addr[CyRBPR] != info->rbpr)
1056 base_addr[CyRBPR] = info->rbpr;
1057
1058 /* set line characteristics according configuration */
1059
1060 if (base_addr[CySCHR1] != START_CHAR(info->tty))
1061 base_addr[CySCHR1] = START_CHAR(info->tty);
1062 if (base_addr[CySCHR2] != STOP_CHAR(info->tty))
1063 base_addr[CySCHR2] = STOP_CHAR(info->tty);
1064 if (base_addr[CySCRL] != START_CHAR(info->tty))
1065 base_addr[CySCRL] = START_CHAR(info->tty);
1066 if (base_addr[CySCRH] != START_CHAR(info->tty))
1067 base_addr[CySCRH] = START_CHAR(info->tty);
1068 if (base_addr[CyCOR1] != info->cor1)
1069 base_addr[CyCOR1] = info->cor1;
1070 if (base_addr[CyCOR2] != info->cor2)
1071 base_addr[CyCOR2] = info->cor2;
1072 if (base_addr[CyCOR3] != info->cor3)
1073 base_addr[CyCOR3] = info->cor3;
1074 if (base_addr[CyCOR4] != info->cor4)
1075 base_addr[CyCOR4] = info->cor4;
1076 if (base_addr[CyCOR5] != info->cor5)
1077 base_addr[CyCOR5] = info->cor5;
1078 if (base_addr[CyCOR6] != info->cor6)
1079 base_addr[CyCOR6] = info->cor6;
1080 if (base_addr[CyCOR7] != info->cor7)
1081 base_addr[CyCOR7] = info->cor7;
1082
1083 if (need_init_chan)
1084 write_cy_cmd(base_addr, CyINIT_CHAN);
1085
1086 base_addr[CyCAR] = (u_char) channel; /* !!! Is this needed? */
1087
1088 /* 2ms default rx timeout */
1089 ti = info->default_timeout ? info->default_timeout : 0x02;
1090 if (base_addr[CyRTPRL] != ti)
1091 base_addr[CyRTPRL] = ti;
1092 if (base_addr[CyRTPRH] != 0)
1093 base_addr[CyRTPRH] = 0;
1094
1095 /* Set up RTS here also ????? RGH 141095 */
1096 if (i == 0) { /* baud rate is zero, turn off line */
1097 if ((base_addr[CyMSVR2] & CyDTR) == CyDTR)
1098 base_addr[CyMSVR2] = 0;
1099 #ifdef SERIAL_DEBUG_DTR
1100 printk("cyc: %d: dropping DTR\n", __LINE__);
1101 printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1],
1102 base_addr[CyMSVR2]);
1103 #endif
1104 } else {
1105 if ((base_addr[CyMSVR2] & CyDTR) != CyDTR)
1106 base_addr[CyMSVR2] = CyDTR;
1107 #ifdef SERIAL_DEBUG_DTR
1108 printk("cyc: %d: raising DTR\n", __LINE__);
1109 printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1],
1110 base_addr[CyMSVR2]);
1111 #endif
1112 }
1113
1114 if (info->tty) {
1115 clear_bit(TTY_IO_ERROR, &info->tty->flags);
1116 }
1117
1118 local_irq_restore(flags);
1119
1120 } /* config_setup */
1121
1122 static void cy_put_char(struct tty_struct *tty, unsigned char ch)
1123 {
1124 struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
1125 unsigned long flags;
1126
1127 #ifdef SERIAL_DEBUG_IO
1128 printk("cy_put_char %s(0x%02x)\n", tty->name, ch);
1129 #endif
1130
1131 if (serial_paranoia_check(info, tty->name, "cy_put_char"))
1132 return;
1133
1134 if (!info->xmit_buf)
1135 return;
1136
1137 local_irq_save(flags);
1138 if (info->xmit_cnt >= PAGE_SIZE - 1) {
1139 local_irq_restore(flags);
1140 return;
1141 }
1142
1143 info->xmit_buf[info->xmit_head++] = ch;
1144 info->xmit_head &= PAGE_SIZE - 1;
1145 info->xmit_cnt++;
1146 local_irq_restore(flags);
1147 } /* cy_put_char */
1148
1149 static void cy_flush_chars(struct tty_struct *tty)
1150 {
1151 struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
1152 unsigned long flags;
1153 volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
1154 int channel;
1155
1156 #ifdef SERIAL_DEBUG_IO
1157 printk("cy_flush_chars %s\n", tty->name); /* */
1158 #endif
1159
1160 if (serial_paranoia_check(info, tty->name, "cy_flush_chars"))
1161 return;
1162
1163 if (info->xmit_cnt <= 0 || tty->stopped
1164 || tty->hw_stopped || !info->xmit_buf)
1165 return;
1166
1167 channel = info->line;
1168
1169 local_irq_save(flags);
1170 base_addr[CyCAR] = channel;
1171 base_addr[CyIER] |= CyTxMpty;
1172 local_irq_restore(flags);
1173 } /* cy_flush_chars */
1174
1175 /* This routine gets called when tty_write has put something into
1176 the write_queue. If the port is not already transmitting stuff,
1177 start it off by enabling interrupts. The interrupt service
1178 routine will then ensure that the characters are sent. If the
1179 port is already active, there is no need to kick it.
1180 */
1181 static int cy_write(struct tty_struct *tty, const unsigned char *buf, int count)
1182 {
1183 struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
1184 unsigned long flags;
1185 int c, total = 0;
1186
1187 #ifdef SERIAL_DEBUG_IO
1188 printk("cy_write %s\n", tty->name); /* */
1189 #endif
1190
1191 if (serial_paranoia_check(info, tty->name, "cy_write")) {
1192 return 0;
1193 }
1194
1195 if (!info->xmit_buf) {
1196 return 0;
1197 }
1198
1199 while (1) {
1200 local_irq_save(flags);
1201 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1202 SERIAL_XMIT_SIZE - info->xmit_head));
1203 if (c <= 0) {
1204 local_irq_restore(flags);
1205 break;
1206 }
1207
1208 memcpy(info->xmit_buf + info->xmit_head, buf, c);
1209 info->xmit_head =
1210 (info->xmit_head + c) & (SERIAL_XMIT_SIZE - 1);
1211 info->xmit_cnt += c;
1212 local_irq_restore(flags);
1213
1214 buf += c;
1215 count -= c;
1216 total += c;
1217 }
1218
1219 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
1220 start_xmit(info);
1221 }
1222 return total;
1223 } /* cy_write */
1224
1225 static int cy_write_room(struct tty_struct *tty)
1226 {
1227 struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
1228 int ret;
1229
1230 #ifdef SERIAL_DEBUG_IO
1231 printk("cy_write_room %s\n", tty->name); /* */
1232 #endif
1233
1234 if (serial_paranoia_check(info, tty->name, "cy_write_room"))
1235 return 0;
1236 ret = PAGE_SIZE - info->xmit_cnt - 1;
1237 if (ret < 0)
1238 ret = 0;
1239 return ret;
1240 } /* cy_write_room */
1241
1242 static int cy_chars_in_buffer(struct tty_struct *tty)
1243 {
1244 struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
1245
1246 #ifdef SERIAL_DEBUG_IO
1247 printk("cy_chars_in_buffer %s %d\n", tty->name, info->xmit_cnt); /* */
1248 #endif
1249
1250 if (serial_paranoia_check(info, tty->name, "cy_chars_in_buffer"))
1251 return 0;
1252
1253 return info->xmit_cnt;
1254 } /* cy_chars_in_buffer */
1255
1256 static void cy_flush_buffer(struct tty_struct *tty)
1257 {
1258 struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
1259 unsigned long flags;
1260
1261 #ifdef SERIAL_DEBUG_IO
1262 printk("cy_flush_buffer %s\n", tty->name); /* */
1263 #endif
1264
1265 if (serial_paranoia_check(info, tty->name, "cy_flush_buffer"))
1266 return;
1267 local_irq_save(flags);
1268 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1269 local_irq_restore(flags);
1270 tty_wakeup(tty);
1271 } /* cy_flush_buffer */
1272
1273 /* This routine is called by the upper-layer tty layer to signal
1274 that incoming characters should be throttled or that the
1275 throttle should be released.
1276 */
1277 static void cy_throttle(struct tty_struct *tty)
1278 {
1279 struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
1280 unsigned long flags;
1281 volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
1282 int channel;
1283
1284 #ifdef SERIAL_DEBUG_THROTTLE
1285 char buf[64];
1286
1287 printk("throttle %s: %d....\n", tty_name(tty, buf),
1288 tty->ldisc.chars_in_buffer(tty));
1289 printk("cy_throttle %s\n", tty->name);
1290 #endif
1291
1292 if (serial_paranoia_check(info, tty->name, "cy_nthrottle")) {
1293 return;
1294 }
1295
1296 if (I_IXOFF(tty)) {
1297 info->x_char = STOP_CHAR(tty);
1298 /* Should use the "Send Special Character" feature!!! */
1299 }
1300
1301 channel = info->line;
1302
1303 local_irq_save(flags);
1304 base_addr[CyCAR] = (u_char) channel;
1305 base_addr[CyMSVR1] = 0;
1306 local_irq_restore(flags);
1307 } /* cy_throttle */
1308
1309 static void cy_unthrottle(struct tty_struct *tty)
1310 {
1311 struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
1312 unsigned long flags;
1313 volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
1314 int channel;
1315
1316 #ifdef SERIAL_DEBUG_THROTTLE
1317 char buf[64];
1318
1319 printk("throttle %s: %d....\n", tty_name(tty, buf),
1320 tty->ldisc.chars_in_buffer(tty));
1321 printk("cy_unthrottle %s\n", tty->name);
1322 #endif
1323
1324 if (serial_paranoia_check(info, tty->name, "cy_nthrottle")) {
1325 return;
1326 }
1327
1328 if (I_IXOFF(tty)) {
1329 info->x_char = START_CHAR(tty);
1330 /* Should use the "Send Special Character" feature!!! */
1331 }
1332
1333 channel = info->line;
1334
1335 local_irq_save(flags);
1336 base_addr[CyCAR] = (u_char) channel;
1337 base_addr[CyMSVR1] = CyRTS;
1338 local_irq_restore(flags);
1339 } /* cy_unthrottle */
1340
1341 static int
1342 get_serial_info(struct cyclades_port *info,
1343 struct serial_struct __user * retinfo)
1344 {
1345 struct serial_struct tmp;
1346
1347 /* CP('g'); */
1348 if (!retinfo)
1349 return -EFAULT;
1350 memset(&tmp, 0, sizeof(tmp));
1351 tmp.type = info->type;
1352 tmp.line = info->line;
1353 tmp.port = info->line;
1354 tmp.irq = 0;
1355 tmp.flags = info->flags;
1356 tmp.baud_base = 0; /*!!! */
1357 tmp.close_delay = info->close_delay;
1358 tmp.custom_divisor = 0; /*!!! */
1359 tmp.hub6 = 0; /*!!! */
1360 return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
1361 } /* get_serial_info */
1362
1363 static int
1364 set_serial_info(struct cyclades_port *info,
1365 struct serial_struct __user * new_info)
1366 {
1367 struct serial_struct new_serial;
1368 struct cyclades_port old_info;
1369
1370 /* CP('s'); */
1371 if (!new_info)
1372 return -EFAULT;
1373 if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1374 return -EFAULT;
1375 old_info = *info;
1376
1377 if (!capable(CAP_SYS_ADMIN)) {
1378 if ((new_serial.close_delay != info->close_delay) ||
1379 ((new_serial.flags & ASYNC_FLAGS & ~ASYNC_USR_MASK) !=
1380 (info->flags & ASYNC_FLAGS & ~ASYNC_USR_MASK)))
1381 return -EPERM;
1382 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1383 (new_serial.flags & ASYNC_USR_MASK));
1384 goto check_and_exit;
1385 }
1386
1387 /*
1388 * OK, past this point, all the error checking has been done.
1389 * At this point, we start making changes.....
1390 */
1391
1392 info->flags = ((info->flags & ~ASYNC_FLAGS) |
1393 (new_serial.flags & ASYNC_FLAGS));
1394 info->close_delay = new_serial.close_delay;
1395
1396 check_and_exit:
1397 if (info->flags & ASYNC_INITIALIZED) {
1398 config_setup(info);
1399 return 0;
1400 }
1401 return startup(info);
1402 } /* set_serial_info */
1403
1404 static int cy_tiocmget(struct tty_struct *tty, struct file *file)
1405 {
1406 struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
1407 int channel;
1408 volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
1409 unsigned long flags;
1410 unsigned char status;
1411
1412 channel = info->line;
1413
1414 local_irq_save(flags);
1415 base_addr[CyCAR] = (u_char) channel;
1416 status = base_addr[CyMSVR1] | base_addr[CyMSVR2];
1417 local_irq_restore(flags);
1418
1419 return ((status & CyRTS) ? TIOCM_RTS : 0)
1420 | ((status & CyDTR) ? TIOCM_DTR : 0)
1421 | ((status & CyDCD) ? TIOCM_CAR : 0)
1422 | ((status & CyDSR) ? TIOCM_DSR : 0)
1423 | ((status & CyCTS) ? TIOCM_CTS : 0);
1424 } /* cy_tiocmget */
1425
1426 static int
1427 cy_tiocmset(struct tty_struct *tty, struct file *file,
1428 unsigned int set, unsigned int clear)
1429 {
1430 struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
1431 int channel;
1432 volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
1433 unsigned long flags;
1434
1435 channel = info->line;
1436
1437 if (set & TIOCM_RTS) {
1438 local_irq_save(flags);
1439 base_addr[CyCAR] = (u_char) channel;
1440 base_addr[CyMSVR1] = CyRTS;
1441 local_irq_restore(flags);
1442 }
1443 if (set & TIOCM_DTR) {
1444 local_irq_save(flags);
1445 base_addr[CyCAR] = (u_char) channel;
1446 /* CP('S');CP('2'); */
1447 base_addr[CyMSVR2] = CyDTR;
1448 #ifdef SERIAL_DEBUG_DTR
1449 printk("cyc: %d: raising DTR\n", __LINE__);
1450 printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1],
1451 base_addr[CyMSVR2]);
1452 #endif
1453 local_irq_restore(flags);
1454 }
1455
1456 if (clear & TIOCM_RTS) {
1457 local_irq_save(flags);
1458 base_addr[CyCAR] = (u_char) channel;
1459 base_addr[CyMSVR1] = 0;
1460 local_irq_restore(flags);
1461 }
1462 if (clear & TIOCM_DTR) {
1463 local_irq_save(flags);
1464 base_addr[CyCAR] = (u_char) channel;
1465 /* CP('C');CP('2'); */
1466 base_addr[CyMSVR2] = 0;
1467 #ifdef SERIAL_DEBUG_DTR
1468 printk("cyc: %d: dropping DTR\n", __LINE__);
1469 printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1],
1470 base_addr[CyMSVR2]);
1471 #endif
1472 local_irq_restore(flags);
1473 }
1474
1475 return 0;
1476 } /* set_modem_info */
1477
1478 static void send_break(struct cyclades_port *info, int duration)
1479 { /* Let the transmit ISR take care of this (since it
1480 requires stuffing characters into the output stream).
1481 */
1482 info->x_break = duration;
1483 if (!info->xmit_cnt) {
1484 start_xmit(info);
1485 }
1486 } /* send_break */
1487
1488 static int
1489 get_mon_info(struct cyclades_port *info, struct cyclades_monitor __user * mon)
1490 {
1491
1492 if (copy_to_user(mon, &info->mon, sizeof(struct cyclades_monitor)))
1493 return -EFAULT;
1494 info->mon.int_count = 0;
1495 info->mon.char_count = 0;
1496 info->mon.char_max = 0;
1497 info->mon.char_last = 0;
1498 return 0;
1499 }
1500
1501 static int set_threshold(struct cyclades_port *info, unsigned long __user * arg)
1502 {
1503 volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
1504 unsigned long value;
1505 int channel;
1506
1507 if (get_user(value, arg))
1508 return -EFAULT;
1509
1510 channel = info->line;
1511 info->cor4 &= ~CyREC_FIFO;
1512 info->cor4 |= value & CyREC_FIFO;
1513 base_addr[CyCOR4] = info->cor4;
1514 return 0;
1515 }
1516
1517 static int
1518 get_threshold(struct cyclades_port *info, unsigned long __user * value)
1519 {
1520 volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
1521 int channel;
1522 unsigned long tmp;
1523
1524 channel = info->line;
1525
1526 tmp = base_addr[CyCOR4] & CyREC_FIFO;
1527 return put_user(tmp, value);
1528 }
1529
1530 static int
1531 set_default_threshold(struct cyclades_port *info, unsigned long __user * arg)
1532 {
1533 unsigned long value;
1534
1535 if (get_user(value, arg))
1536 return -EFAULT;
1537
1538 info->default_threshold = value & 0x0f;
1539 return 0;
1540 }
1541
1542 static int
1543 get_default_threshold(struct cyclades_port *info, unsigned long __user * value)
1544 {
1545 return put_user(info->default_threshold, value);
1546 }
1547
1548 static int set_timeout(struct cyclades_port *info, unsigned long __user * arg)
1549 {
1550 volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
1551 int channel;
1552 unsigned long value;
1553
1554 if (get_user(value, arg))
1555 return -EFAULT;
1556
1557 channel = info->line;
1558
1559 base_addr[CyRTPRL] = value & 0xff;
1560 base_addr[CyRTPRH] = (value >> 8) & 0xff;
1561 return 0;
1562 }
1563
1564 static int get_timeout(struct cyclades_port *info, unsigned long __user * value)
1565 {
1566 volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
1567 int channel;
1568 unsigned long tmp;
1569
1570 channel = info->line;
1571
1572 tmp = base_addr[CyRTPRL];
1573 return put_user(tmp, value);
1574 }
1575
1576 static int set_default_timeout(struct cyclades_port *info, unsigned long value)
1577 {
1578 info->default_timeout = value & 0xff;
1579 return 0;
1580 }
1581
1582 static int
1583 get_default_timeout(struct cyclades_port *info, unsigned long __user * value)
1584 {
1585 return put_user(info->default_timeout, value);
1586 }
1587
1588 static int
1589 cy_ioctl(struct tty_struct *tty, struct file *file,
1590 unsigned int cmd, unsigned long arg)
1591 {
1592 unsigned long val;
1593 struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
1594 int ret_val = 0;
1595 void __user *argp = (void __user *)arg;
1596
1597 #ifdef SERIAL_DEBUG_OTHER
1598 printk("cy_ioctl %s, cmd = %x arg = %lx\n", tty->name, cmd, arg); /* */
1599 #endif
1600
1601 switch (cmd) {
1602 case CYGETMON:
1603 ret_val = get_mon_info(info, argp);
1604 break;
1605 case CYGETTHRESH:
1606 ret_val = get_threshold(info, argp);
1607 break;
1608 case CYSETTHRESH:
1609 ret_val = set_threshold(info, argp);
1610 break;
1611 case CYGETDEFTHRESH:
1612 ret_val = get_default_threshold(info, argp);
1613 break;
1614 case CYSETDEFTHRESH:
1615 ret_val = set_default_threshold(info, argp);
1616 break;
1617 case CYGETTIMEOUT:
1618 ret_val = get_timeout(info, argp);
1619 break;
1620 case CYSETTIMEOUT:
1621 ret_val = set_timeout(info, argp);
1622 break;
1623 case CYGETDEFTIMEOUT:
1624 ret_val = get_default_timeout(info, argp);
1625 break;
1626 case CYSETDEFTIMEOUT:
1627 ret_val = set_default_timeout(info, (unsigned long)arg);
1628 break;
1629 case TCSBRK: /* SVID version: non-zero arg --> no break */
1630 ret_val = tty_check_change(tty);
1631 if (ret_val)
1632 break;
1633 tty_wait_until_sent(tty, 0);
1634 if (!arg)
1635 send_break(info, HZ / 4); /* 1/4 second */
1636 break;
1637 case TCSBRKP: /* support for POSIX tcsendbreak() */
1638 ret_val = tty_check_change(tty);
1639 if (ret_val)
1640 break;
1641 tty_wait_until_sent(tty, 0);
1642 send_break(info, arg ? arg * (HZ / 10) : HZ / 4);
1643 break;
1644
1645 /* The following commands are incompletely implemented!!! */
1646 case TIOCGSOFTCAR:
1647 ret_val =
1648 put_user(C_CLOCAL(tty) ? 1 : 0,
1649 (unsigned long __user *)argp);
1650 break;
1651 case TIOCSSOFTCAR:
1652 ret_val = get_user(val, (unsigned long __user *)argp);
1653 if (ret_val)
1654 break;
1655 tty->termios->c_cflag =
1656 ((tty->termios->c_cflag & ~CLOCAL) | (val ? CLOCAL : 0));
1657 break;
1658 case TIOCGSERIAL:
1659 ret_val = get_serial_info(info, argp);
1660 break;
1661 case TIOCSSERIAL:
1662 ret_val = set_serial_info(info, argp);
1663 break;
1664 default:
1665 ret_val = -ENOIOCTLCMD;
1666 }
1667
1668 #ifdef SERIAL_DEBUG_OTHER
1669 printk("cy_ioctl done\n");
1670 #endif
1671
1672 return ret_val;
1673 } /* cy_ioctl */
1674
1675 static void cy_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1676 {
1677 struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
1678
1679 #ifdef SERIAL_DEBUG_OTHER
1680 printk("cy_set_termios %s\n", tty->name);
1681 #endif
1682
1683 if (tty->termios->c_cflag == old_termios->c_cflag)
1684 return;
1685 config_setup(info);
1686
1687 if ((old_termios->c_cflag & CRTSCTS) &&
1688 !(tty->termios->c_cflag & CRTSCTS)) {
1689 tty->stopped = 0;
1690 cy_start(tty);
1691 }
1692 #ifdef tytso_patch_94Nov25_1726
1693 if (!(old_termios->c_cflag & CLOCAL) &&
1694 (tty->termios->c_cflag & CLOCAL))
1695 wake_up_interruptible(&info->open_wait);
1696 #endif
1697 } /* cy_set_termios */
1698
1699 static void cy_close(struct tty_struct *tty, struct file *filp)
1700 {
1701 struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
1702
1703 /* CP('C'); */
1704 #ifdef SERIAL_DEBUG_OTHER
1705 printk("cy_close %s\n", tty->name);
1706 #endif
1707
1708 if (!info || serial_paranoia_check(info, tty->name, "cy_close")) {
1709 return;
1710 }
1711 #ifdef SERIAL_DEBUG_OPEN
1712 printk("cy_close %s, count = %d\n", tty->name, info->count);
1713 #endif
1714
1715 if ((tty->count == 1) && (info->count != 1)) {
1716 /*
1717 * Uh, oh. tty->count is 1, which means that the tty
1718 * structure will be freed. Info->count should always
1719 * be one in these conditions. If it's greater than
1720 * one, we've got real problems, since it means the
1721 * serial port won't be shutdown.
1722 */
1723 printk("cy_close: bad serial port count; tty->count is 1, "
1724 "info->count is %d\n", info->count);
1725 info->count = 1;
1726 }
1727 #ifdef SERIAL_DEBUG_COUNT
1728 printk("cyc: %d: decrementing count to %d\n", __LINE__,
1729 info->count - 1);
1730 #endif
1731 if (--info->count < 0) {
1732 printk("cy_close: bad serial port count for ttys%d: %d\n",
1733 info->line, info->count);
1734 #ifdef SERIAL_DEBUG_COUNT
1735 printk("cyc: %d: setting count to 0\n", __LINE__);
1736 #endif
1737 info->count = 0;
1738 }
1739 if (info->count)
1740 return;
1741 info->flags |= ASYNC_CLOSING;
1742 if (info->flags & ASYNC_INITIALIZED)
1743 tty_wait_until_sent(tty, 3000); /* 30 seconds timeout */
1744 shutdown(info);
1745 if (tty->driver->flush_buffer)
1746 tty->driver->flush_buffer(tty);
1747 tty_ldisc_flush(tty);
1748 info->event = 0;
1749 info->tty = NULL;
1750 if (info->blocked_open) {
1751 if (info->close_delay) {
1752 msleep_interruptible(jiffies_to_msecs
1753 (info->close_delay));
1754 }
1755 wake_up_interruptible(&info->open_wait);
1756 }
1757 info->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
1758 wake_up_interruptible(&info->close_wait);
1759
1760 #ifdef SERIAL_DEBUG_OTHER
1761 printk("cy_close done\n");
1762 #endif
1763 } /* cy_close */
1764
1765 /*
1766 * cy_hangup() --- called by tty_hangup() when a hangup is signaled.
1767 */
1768 void cy_hangup(struct tty_struct *tty)
1769 {
1770 struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
1771
1772 #ifdef SERIAL_DEBUG_OTHER
1773 printk("cy_hangup %s\n", tty->name); /* */
1774 #endif
1775
1776 if (serial_paranoia_check(info, tty->name, "cy_hangup"))
1777 return;
1778
1779 shutdown(info);
1780 #if 0
1781 info->event = 0;
1782 info->count = 0;
1783 #ifdef SERIAL_DEBUG_COUNT
1784 printk("cyc: %d: setting count to 0\n", __LINE__);
1785 #endif
1786 info->tty = 0;
1787 #endif
1788 info->flags &= ~ASYNC_NORMAL_ACTIVE;
1789 wake_up_interruptible(&info->open_wait);
1790 } /* cy_hangup */
1791
1792 /*
1793 * ------------------------------------------------------------
1794 * cy_open() and friends
1795 * ------------------------------------------------------------
1796 */
1797
1798 static int
1799 block_til_ready(struct tty_struct *tty, struct file *filp,
1800 struct cyclades_port *info)
1801 {
1802 DECLARE_WAITQUEUE(wait, current);
1803 unsigned long flags;
1804 int channel;
1805 int retval;
1806 volatile u_char *base_addr = (u_char *) BASE_ADDR;
1807
1808 /*
1809 * If the device is in the middle of being closed, then block
1810 * until it's done, and then try again.
1811 */
1812 if (info->flags & ASYNC_CLOSING) {
1813 interruptible_sleep_on(&info->close_wait);
1814 if (info->flags & ASYNC_HUP_NOTIFY) {
1815 return -EAGAIN;
1816 } else {
1817 return -ERESTARTSYS;
1818 }
1819 }
1820
1821 /*
1822 * If non-blocking mode is set, then make the check up front
1823 * and then exit.
1824 */
1825 if (filp->f_flags & O_NONBLOCK) {
1826 info->flags |= ASYNC_NORMAL_ACTIVE;
1827 return 0;
1828 }
1829
1830 /*
1831 * Block waiting for the carrier detect and the line to become
1832 * free (i.e., not in use by the callout). While we are in
1833 * this loop, info->count is dropped by one, so that
1834 * cy_close() knows when to free things. We restore it upon
1835 * exit, either normal or abnormal.
1836 */
1837 retval = 0;
1838 add_wait_queue(&info->open_wait, &wait);
1839 #ifdef SERIAL_DEBUG_OPEN
1840 printk("block_til_ready before block: %s, count = %d\n",
1841 tty->name, info->count);
1842 /**/
1843 #endif
1844 info->count--;
1845 #ifdef SERIAL_DEBUG_COUNT
1846 printk("cyc: %d: decrementing count to %d\n", __LINE__, info->count);
1847 #endif
1848 info->blocked_open++;
1849
1850 channel = info->line;
1851
1852 while (1) {
1853 local_irq_save(flags);
1854 base_addr[CyCAR] = (u_char) channel;
1855 base_addr[CyMSVR1] = CyRTS;
1856 /* CP('S');CP('4'); */
1857 base_addr[CyMSVR2] = CyDTR;
1858 #ifdef SERIAL_DEBUG_DTR
1859 printk("cyc: %d: raising DTR\n", __LINE__);
1860 printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1],
1861 base_addr[CyMSVR2]);
1862 #endif
1863 local_irq_restore(flags);
1864 set_current_state(TASK_INTERRUPTIBLE);
1865 if (tty_hung_up_p(filp)
1866 || !(info->flags & ASYNC_INITIALIZED)) {
1867 if (info->flags & ASYNC_HUP_NOTIFY) {
1868 retval = -EAGAIN;
1869 } else {
1870 retval = -ERESTARTSYS;
1871 }
1872 break;
1873 }
1874 local_irq_save(flags);
1875 base_addr[CyCAR] = (u_char) channel;
1876 /* CP('L');CP1(1 && C_CLOCAL(tty)); CP1(1 && (base_addr[CyMSVR1] & CyDCD) ); */
1877 if (!(info->flags & ASYNC_CLOSING)
1878 && (C_CLOCAL(tty)
1879 || (base_addr[CyMSVR1] & CyDCD))) {
1880 local_irq_restore(flags);
1881 break;
1882 }
1883 local_irq_restore(flags);
1884 if (signal_pending(current)) {
1885 retval = -ERESTARTSYS;
1886 break;
1887 }
1888 #ifdef SERIAL_DEBUG_OPEN
1889 printk("block_til_ready blocking: %s, count = %d\n",
1890 tty->name, info->count);
1891 /**/
1892 #endif
1893 schedule();
1894 }
1895 __set_current_state(TASK_RUNNING);
1896 remove_wait_queue(&info->open_wait, &wait);
1897 if (!tty_hung_up_p(filp)) {
1898 info->count++;
1899 #ifdef SERIAL_DEBUG_COUNT
1900 printk("cyc: %d: incrementing count to %d\n", __LINE__,
1901 info->count);
1902 #endif
1903 }
1904 info->blocked_open--;
1905 #ifdef SERIAL_DEBUG_OPEN
1906 printk("block_til_ready after blocking: %s, count = %d\n",
1907 tty->name, info->count);
1908 /**/
1909 #endif
1910 if (retval)
1911 return retval;
1912 info->flags |= ASYNC_NORMAL_ACTIVE;
1913 return 0;
1914 } /* block_til_ready */
1915
1916 /*
1917 * This routine is called whenever a serial port is opened. It
1918 * performs the serial-specific initialization for the tty structure.
1919 */
1920 int cy_open(struct tty_struct *tty, struct file *filp)
1921 {
1922 struct cyclades_port *info;
1923 int retval, line;
1924
1925 /* CP('O'); */
1926 line = tty->index;
1927 if ((line < 0) || (NR_PORTS <= line)) {
1928 return -ENODEV;
1929 }
1930 info = &cy_port[line];
1931 if (info->line < 0) {
1932 return -ENODEV;
1933 }
1934 #ifdef SERIAL_DEBUG_OTHER
1935 printk("cy_open %s\n", tty->name); /* */
1936 #endif
1937 if (serial_paranoia_check(info, tty->name, "cy_open")) {
1938 return -ENODEV;
1939 }
1940 #ifdef SERIAL_DEBUG_OPEN
1941 printk("cy_open %s, count = %d\n", tty->name, info->count);
1942 /**/
1943 #endif
1944 info->count++;
1945 #ifdef SERIAL_DEBUG_COUNT
1946 printk("cyc: %d: incrementing count to %d\n", __LINE__, info->count);
1947 #endif
1948 tty->driver_data = info;
1949 info->tty = tty;
1950
1951 /*
1952 * Start up serial port
1953 */
1954 retval = startup(info);
1955 if (retval) {
1956 return retval;
1957 }
1958
1959 retval = block_til_ready(tty, filp, info);
1960 if (retval) {
1961 #ifdef SERIAL_DEBUG_OPEN
1962 printk("cy_open returning after block_til_ready with %d\n",
1963 retval);
1964 #endif
1965 return retval;
1966 }
1967 #ifdef SERIAL_DEBUG_OPEN
1968 printk("cy_open done\n");
1969 /**/
1970 #endif
1971 return 0;
1972 } /* cy_open */
1973
1974 /*
1975 * ---------------------------------------------------------------------
1976 * serial167_init() and friends
1977 *
1978 * serial167_init() is called at boot-time to initialize the serial driver.
1979 * ---------------------------------------------------------------------
1980 */
1981
1982 /*
1983 * This routine prints out the appropriate serial driver version
1984 * number, and identifies which options were configured into this
1985 * driver.
1986 */
1987 static void show_version(void)
1988 {
1989 printk("MVME166/167 cd2401 driver\n");
1990 } /* show_version */
1991
1992 /* initialize chips on card -- return number of valid
1993 chips (which is number of ports/4) */
1994
1995 /*
1996 * This initialises the hardware to a reasonable state. It should
1997 * probe the chip first so as to copy 166-Bug setup as a default for
1998 * port 0. It initialises CMR to CyASYNC; that is never done again, so
1999 * as to limit the number of CyINIT_CHAN commands in normal running.
2000 *
2001 * ... I wonder what I should do if this fails ...
2002 */
2003
2004 void mvme167_serial_console_setup(int cflag)
2005 {
2006 volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
2007 int ch;
2008 u_char spd;
2009 u_char rcor, rbpr, badspeed = 0;
2010 unsigned long flags;
2011
2012 local_irq_save(flags);
2013
2014 /*
2015 * First probe channel zero of the chip, to see what speed has
2016 * been selected.
2017 */
2018
2019 base_addr[CyCAR] = 0;
2020
2021 rcor = base_addr[CyRCOR] << 5;
2022 rbpr = base_addr[CyRBPR];
2023
2024 for (spd = 0; spd < sizeof(baud_bpr); spd++)
2025 if (rbpr == baud_bpr[spd] && rcor == baud_co[spd])
2026 break;
2027 if (spd >= sizeof(baud_bpr)) {
2028 spd = 14; /* 19200 */
2029 badspeed = 1; /* Failed to identify speed */
2030 }
2031 initial_console_speed = spd;
2032
2033 /* OK, we have chosen a speed, now reset and reinitialise */
2034
2035 my_udelay(20000L); /* Allow time for any active o/p to complete */
2036 if (base_addr[CyCCR] != 0x00) {
2037 local_irq_restore(flags);
2038 /* printk(" chip is never idle (CCR != 0)\n"); */
2039 return;
2040 }
2041
2042 base_addr[CyCCR] = CyCHIP_RESET; /* Reset the chip */
2043 my_udelay(1000L);
2044
2045 if (base_addr[CyGFRCR] == 0x00) {
2046 local_irq_restore(flags);
2047 /* printk(" chip is not responding (GFRCR stayed 0)\n"); */
2048 return;
2049 }
2050
2051 /*
2052 * System clock is 20Mhz, divided by 2048, so divide by 10 for a 1.0ms
2053 * tick
2054 */
2055
2056 base_addr[CyTPR] = 10;
2057
2058 base_addr[CyPILR1] = 0x01; /* Interrupt level for modem change */
2059 base_addr[CyPILR2] = 0x02; /* Interrupt level for tx ints */
2060 base_addr[CyPILR3] = 0x03; /* Interrupt level for rx ints */
2061
2062 /*
2063 * Attempt to set up all channels to something reasonable, and
2064 * bang out a INIT_CHAN command. We should then be able to limit
2065 * the ammount of fiddling we have to do in normal running.
2066 */
2067
2068 for (ch = 3; ch >= 0; ch--) {
2069 base_addr[CyCAR] = (u_char) ch;
2070 base_addr[CyIER] = 0;
2071 base_addr[CyCMR] = CyASYNC;
2072 base_addr[CyLICR] = (u_char) ch << 2;
2073 base_addr[CyLIVR] = 0x5c;
2074 base_addr[CyTCOR] = baud_co[spd];
2075 base_addr[CyTBPR] = baud_bpr[spd];
2076 base_addr[CyRCOR] = baud_co[spd] >> 5;
2077 base_addr[CyRBPR] = baud_bpr[spd];
2078 base_addr[CySCHR1] = 'Q' & 0x1f;
2079 base_addr[CySCHR2] = 'X' & 0x1f;
2080 base_addr[CySCRL] = 0;
2081 base_addr[CySCRH] = 0;
2082 base_addr[CyCOR1] = Cy_8_BITS | CyPARITY_NONE;
2083 base_addr[CyCOR2] = 0;
2084 base_addr[CyCOR3] = Cy_1_STOP;
2085 base_addr[CyCOR4] = baud_cor4[spd];
2086 base_addr[CyCOR5] = 0;
2087 base_addr[CyCOR6] = 0;
2088 base_addr[CyCOR7] = 0;
2089 base_addr[CyRTPRL] = 2;
2090 base_addr[CyRTPRH] = 0;
2091 base_addr[CyMSVR1] = 0;
2092 base_addr[CyMSVR2] = 0;
2093 write_cy_cmd(base_addr, CyINIT_CHAN | CyDIS_RCVR | CyDIS_XMTR);
2094 }
2095
2096 /*
2097 * Now do specials for channel zero....
2098 */
2099
2100 base_addr[CyMSVR1] = CyRTS;
2101 base_addr[CyMSVR2] = CyDTR;
2102 base_addr[CyIER] = CyRxData;
2103 write_cy_cmd(base_addr, CyENB_RCVR | CyENB_XMTR);
2104
2105 local_irq_restore(flags);
2106
2107 my_udelay(20000L); /* Let it all settle down */
2108
2109 printk("CD2401 initialised, chip is rev 0x%02x\n", base_addr[CyGFRCR]);
2110 if (badspeed)
2111 printk
2112 (" WARNING: Failed to identify line speed, rcor=%02x,rbpr=%02x\n",
2113 rcor >> 5, rbpr);
2114 } /* serial_console_init */
2115
2116 static const struct tty_operations cy_ops = {
2117 .open = cy_open,
2118 .close = cy_close,
2119 .write = cy_write,
2120 .put_char = cy_put_char,
2121 .flush_chars = cy_flush_chars,
2122 .write_room = cy_write_room,
2123 .chars_in_buffer = cy_chars_in_buffer,
2124 .flush_buffer = cy_flush_buffer,
2125 .ioctl = cy_ioctl,
2126 .throttle = cy_throttle,
2127 .unthrottle = cy_unthrottle,
2128 .set_termios = cy_set_termios,
2129 .stop = cy_stop,
2130 .start = cy_start,
2131 .hangup = cy_hangup,
2132 .tiocmget = cy_tiocmget,
2133 .tiocmset = cy_tiocmset,
2134 };
2135
2136 /* The serial driver boot-time initialization code!
2137 Hardware I/O ports are mapped to character special devices on a
2138 first found, first allocated manner. That is, this code searches
2139 for Cyclom cards in the system. As each is found, it is probed
2140 to discover how many chips (and thus how many ports) are present.
2141 These ports are mapped to the tty ports 64 and upward in monotonic
2142 fashion. If an 8-port card is replaced with a 16-port card, the
2143 port mapping on a following card will shift.
2144
2145 This approach is different from what is used in the other serial
2146 device driver because the Cyclom is more properly a multiplexer,
2147 not just an aggregation of serial ports on one card.
2148
2149 If there are more cards with more ports than have been statically
2150 allocated above, a warning is printed and the extra ports are ignored.
2151 */
2152 static int __init serial167_init(void)
2153 {
2154 struct cyclades_port *info;
2155 int ret = 0;
2156 int good_ports = 0;
2157 int port_num = 0;
2158 int index;
2159 int DefSpeed;
2160 #ifdef notyet
2161 struct sigaction sa;
2162 #endif
2163
2164 if (!(mvme16x_config & MVME16x_CONFIG_GOT_CD2401))
2165 return 0;
2166
2167 cy_serial_driver = alloc_tty_driver(NR_PORTS);
2168 if (!cy_serial_driver)
2169 return -ENOMEM;
2170
2171 #if 0
2172 scrn[1] = '\0';
2173 #endif
2174
2175 show_version();
2176
2177 /* Has "console=0,9600n8" been used in bootinfo to change speed? */
2178 if (serial_console_cflag)
2179 DefSpeed = serial_console_cflag & 0017;
2180 else {
2181 DefSpeed = initial_console_speed;
2182 serial_console_info = &cy_port[0];
2183 serial_console_cflag = DefSpeed | CS8;
2184 #if 0
2185 serial_console = 64; /*callout_driver.minor_start */
2186 #endif
2187 }
2188
2189 /* Initialize the tty_driver structure */
2190
2191 cy_serial_driver->owner = THIS_MODULE;
2192 cy_serial_driver->name = "ttyS";
2193 cy_serial_driver->major = TTY_MAJOR;
2194 cy_serial_driver->minor_start = 64;
2195 cy_serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2196 cy_serial_driver->subtype = SERIAL_TYPE_NORMAL;
2197 cy_serial_driver->init_termios = tty_std_termios;
2198 cy_serial_driver->init_termios.c_cflag =
2199 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2200 cy_serial_driver->flags = TTY_DRIVER_REAL_RAW;
2201 tty_set_operations(cy_serial_driver, &cy_ops);
2202
2203 ret = tty_register_driver(cy_serial_driver);
2204 if (ret) {
2205 printk(KERN_ERR "Couldn't register MVME166/7 serial driver\n");
2206 put_tty_driver(cy_serial_driver);
2207 return ret;
2208 }
2209
2210 port_num = 0;
2211 info = cy_port;
2212 for (index = 0; index < 1; index++) {
2213
2214 good_ports = 4;
2215
2216 if (port_num < NR_PORTS) {
2217 while (good_ports-- && port_num < NR_PORTS) {
2218 /*** initialize port ***/
2219 info->magic = CYCLADES_MAGIC;
2220 info->type = PORT_CIRRUS;
2221 info->card = index;
2222 info->line = port_num;
2223 info->flags = STD_COM_FLAGS;
2224 info->tty = NULL;
2225 info->xmit_fifo_size = 12;
2226 info->cor1 = CyPARITY_NONE | Cy_8_BITS;
2227 info->cor2 = CyETC;
2228 info->cor3 = Cy_1_STOP;
2229 info->cor4 = 0x08; /* _very_ small receive threshold */
2230 info->cor5 = 0;
2231 info->cor6 = 0;
2232 info->cor7 = 0;
2233 info->tbpr = baud_bpr[DefSpeed]; /* Tx BPR */
2234 info->tco = baud_co[DefSpeed]; /* Tx CO */
2235 info->rbpr = baud_bpr[DefSpeed]; /* Rx BPR */
2236 info->rco = baud_co[DefSpeed] >> 5; /* Rx CO */
2237 info->close_delay = 0;
2238 info->x_char = 0;
2239 info->event = 0;
2240 info->count = 0;
2241 #ifdef SERIAL_DEBUG_COUNT
2242 printk("cyc: %d: setting count to 0\n",
2243 __LINE__);
2244 #endif
2245 info->blocked_open = 0;
2246 info->default_threshold = 0;
2247 info->default_timeout = 0;
2248 INIT_WORK(&info->tqueue, do_softint);
2249 init_waitqueue_head(&info->open_wait);
2250 init_waitqueue_head(&info->close_wait);
2251 /* info->session */
2252 /* info->pgrp */
2253 /*** !!!!!!!! this may expose new bugs !!!!!!!!! *********/
2254 info->read_status_mask =
2255 CyTIMEOUT | CySPECHAR | CyBREAK | CyPARITY |
2256 CyFRAME | CyOVERRUN;
2257 /* info->timeout */
2258
2259 printk("ttyS%d ", info->line);
2260 port_num++;
2261 info++;
2262 if (!(port_num & 7)) {
2263 printk("\n ");
2264 }
2265 }
2266 }
2267 printk("\n");
2268 }
2269 while (port_num < NR_PORTS) {
2270 info->line = -1;
2271 port_num++;
2272 info++;
2273 }
2274 #ifdef CONFIG_REMOTE_DEBUG
2275 debug_setup();
2276 #endif
2277 ret = request_irq(MVME167_IRQ_SER_ERR, cd2401_rxerr_interrupt, 0,
2278 "cd2401_errors", cd2401_rxerr_interrupt);
2279 if (ret) {
2280 printk(KERN_ERR "Could't get cd2401_errors IRQ");
2281 goto cleanup_serial_driver;
2282 }
2283
2284 ret = request_irq(MVME167_IRQ_SER_MODEM, cd2401_modem_interrupt, 0,
2285 "cd2401_modem", cd2401_modem_interrupt);
2286 if (ret) {
2287 printk(KERN_ERR "Could't get cd2401_modem IRQ");
2288 goto cleanup_irq_cd2401_errors;
2289 }
2290
2291 ret = request_irq(MVME167_IRQ_SER_TX, cd2401_tx_interrupt, 0,
2292 "cd2401_txints", cd2401_tx_interrupt);
2293 if (ret) {
2294 printk(KERN_ERR "Could't get cd2401_txints IRQ");
2295 goto cleanup_irq_cd2401_modem;
2296 }
2297
2298 ret = request_irq(MVME167_IRQ_SER_RX, cd2401_rx_interrupt, 0,
2299 "cd2401_rxints", cd2401_rx_interrupt);
2300 if (ret) {
2301 printk(KERN_ERR "Could't get cd2401_rxints IRQ");
2302 goto cleanup_irq_cd2401_txints;
2303 }
2304
2305 /* Now we have registered the interrupt handlers, allow the interrupts */
2306
2307 pcc2chip[PccSCCMICR] = 0x15; /* Serial ints are level 5 */
2308 pcc2chip[PccSCCTICR] = 0x15;
2309 pcc2chip[PccSCCRICR] = 0x15;
2310
2311 pcc2chip[PccIMLR] = 3; /* Allow PCC2 ints above 3!? */
2312
2313 return 0;
2314 cleanup_irq_cd2401_txints:
2315 free_irq(MVME167_IRQ_SER_TX, cd2401_tx_interrupt);
2316 cleanup_irq_cd2401_modem:
2317 free_irq(MVME167_IRQ_SER_MODEM, cd2401_modem_interrupt);
2318 cleanup_irq_cd2401_errors:
2319 free_irq(MVME167_IRQ_SER_ERR, cd2401_rxerr_interrupt);
2320 cleanup_serial_driver:
2321 if (tty_unregister_driver(cy_serial_driver))
2322 printk(KERN_ERR
2323 "Couldn't unregister MVME166/7 serial driver\n");
2324 put_tty_driver(cy_serial_driver);
2325 return ret;
2326 } /* serial167_init */
2327
2328 module_init(serial167_init);
2329
2330 #ifdef CYCLOM_SHOW_STATUS
2331 static void show_status(int line_num)
2332 {
2333 volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
2334 int channel;
2335 struct cyclades_port *info;
2336 unsigned long flags;
2337
2338 info = &cy_port[line_num];
2339 channel = info->line;
2340 printk(" channel %d\n", channel);
2341 /**/ printk(" cy_port\n");
2342 printk(" card line flags = %d %d %x\n",
2343 info->card, info->line, info->flags);
2344 printk
2345 (" *tty read_status_mask timeout xmit_fifo_size = %lx %x %x %x\n",
2346 (long)info->tty, info->read_status_mask, info->timeout,
2347 info->xmit_fifo_size);
2348 printk(" cor1,cor2,cor3,cor4,cor5,cor6,cor7 = %x %x %x %x %x %x %x\n",
2349 info->cor1, info->cor2, info->cor3, info->cor4, info->cor5,
2350 info->cor6, info->cor7);
2351 printk(" tbpr,tco,rbpr,rco = %d %d %d %d\n", info->tbpr, info->tco,
2352 info->rbpr, info->rco);
2353 printk(" close_delay event count = %d %d %d\n", info->close_delay,
2354 info->event, info->count);
2355 printk(" x_char blocked_open = %x %x\n", info->x_char,
2356 info->blocked_open);
2357 printk(" open_wait = %lx %lx %lx\n", (long)info->open_wait);
2358
2359 local_irq_save(flags);
2360
2361 /* Global Registers */
2362
2363 printk(" CyGFRCR %x\n", base_addr[CyGFRCR]);
2364 printk(" CyCAR %x\n", base_addr[CyCAR]);
2365 printk(" CyRISR %x\n", base_addr[CyRISR]);
2366 printk(" CyTISR %x\n", base_addr[CyTISR]);
2367 printk(" CyMISR %x\n", base_addr[CyMISR]);
2368 printk(" CyRIR %x\n", base_addr[CyRIR]);
2369 printk(" CyTIR %x\n", base_addr[CyTIR]);
2370 printk(" CyMIR %x\n", base_addr[CyMIR]);
2371 printk(" CyTPR %x\n", base_addr[CyTPR]);
2372
2373 base_addr[CyCAR] = (u_char) channel;
2374
2375 /* Virtual Registers */
2376
2377 #if 0
2378 printk(" CyRIVR %x\n", base_addr[CyRIVR]);
2379 printk(" CyTIVR %x\n", base_addr[CyTIVR]);
2380 printk(" CyMIVR %x\n", base_addr[CyMIVR]);
2381 printk(" CyMISR %x\n", base_addr[CyMISR]);
2382 #endif
2383
2384 /* Channel Registers */
2385
2386 printk(" CyCCR %x\n", base_addr[CyCCR]);
2387 printk(" CyIER %x\n", base_addr[CyIER]);
2388 printk(" CyCOR1 %x\n", base_addr[CyCOR1]);
2389 printk(" CyCOR2 %x\n", base_addr[CyCOR2]);
2390 printk(" CyCOR3 %x\n", base_addr[CyCOR3]);
2391 printk(" CyCOR4 %x\n", base_addr[CyCOR4]);
2392 printk(" CyCOR5 %x\n", base_addr[CyCOR5]);
2393 #if 0
2394 printk(" CyCCSR %x\n", base_addr[CyCCSR]);
2395 printk(" CyRDCR %x\n", base_addr[CyRDCR]);
2396 #endif
2397 printk(" CySCHR1 %x\n", base_addr[CySCHR1]);
2398 printk(" CySCHR2 %x\n", base_addr[CySCHR2]);
2399 #if 0
2400 printk(" CySCHR3 %x\n", base_addr[CySCHR3]);
2401 printk(" CySCHR4 %x\n", base_addr[CySCHR4]);
2402 printk(" CySCRL %x\n", base_addr[CySCRL]);
2403 printk(" CySCRH %x\n", base_addr[CySCRH]);
2404 printk(" CyLNC %x\n", base_addr[CyLNC]);
2405 printk(" CyMCOR1 %x\n", base_addr[CyMCOR1]);
2406 printk(" CyMCOR2 %x\n", base_addr[CyMCOR2]);
2407 #endif
2408 printk(" CyRTPRL %x\n", base_addr[CyRTPRL]);
2409 printk(" CyRTPRH %x\n", base_addr[CyRTPRH]);
2410 printk(" CyMSVR1 %x\n", base_addr[CyMSVR1]);
2411 printk(" CyMSVR2 %x\n", base_addr[CyMSVR2]);
2412 printk(" CyRBPR %x\n", base_addr[CyRBPR]);
2413 printk(" CyRCOR %x\n", base_addr[CyRCOR]);
2414 printk(" CyTBPR %x\n", base_addr[CyTBPR]);
2415 printk(" CyTCOR %x\n", base_addr[CyTCOR]);
2416
2417 local_irq_restore(flags);
2418 } /* show_status */
2419 #endif
2420
2421 #if 0
2422 /* Dummy routine in mvme16x/config.c for now */
2423
2424 /* Serial console setup. Called from linux/init/main.c */
2425
2426 void console_setup(char *str, int *ints)
2427 {
2428 char *s;
2429 int baud, bits, parity;
2430 int cflag = 0;
2431
2432 /* Sanity check. */
2433 if (ints[0] > 3 || ints[1] > 3)
2434 return;
2435
2436 /* Get baud, bits and parity */
2437 baud = 2400;
2438 bits = 8;
2439 parity = 'n';
2440 if (ints[2])
2441 baud = ints[2];
2442 if ((s = strchr(str, ','))) {
2443 do {
2444 s++;
2445 } while (*s >= '0' && *s <= '9');
2446 if (*s)
2447 parity = *s++;
2448 if (*s)
2449 bits = *s - '0';
2450 }
2451
2452 /* Now construct a cflag setting. */
2453 switch (baud) {
2454 case 1200:
2455 cflag |= B1200;
2456 break;
2457 case 9600:
2458 cflag |= B9600;
2459 break;
2460 case 19200:
2461 cflag |= B19200;
2462 break;
2463 case 38400:
2464 cflag |= B38400;
2465 break;
2466 case 2400:
2467 default:
2468 cflag |= B2400;
2469 break;
2470 }
2471 switch (bits) {
2472 case 7:
2473 cflag |= CS7;
2474 break;
2475 default:
2476 case 8:
2477 cflag |= CS8;
2478 break;
2479 }
2480 switch (parity) {
2481 case 'o':
2482 case 'O':
2483 cflag |= PARODD;
2484 break;
2485 case 'e':
2486 case 'E':
2487 cflag |= PARENB;
2488 break;
2489 }
2490
2491 serial_console_info = &cy_port[ints[1]];
2492 serial_console_cflag = cflag;
2493 serial_console = ints[1] + 64; /*callout_driver.minor_start */
2494 }
2495 #endif
2496
2497 /*
2498 * The following is probably out of date for 2.1.x serial console stuff.
2499 *
2500 * The console is registered early on from arch/m68k/kernel/setup.c, and
2501 * it therefore relies on the chip being setup correctly by 166-Bug. This
2502 * seems reasonable, as the serial port has been used to invoke the system
2503 * boot. It also means that this function must not rely on any data
2504 * initialisation performed by serial167_init() etc.
2505 *
2506 * Of course, once the console has been registered, we had better ensure
2507 * that serial167_init() doesn't leave the chip non-functional.
2508 *
2509 * The console must be locked when we get here.
2510 */
2511
2512 void serial167_console_write(struct console *co, const char *str,
2513 unsigned count)
2514 {
2515 volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
2516 unsigned long flags;
2517 volatile u_char sink;
2518 u_char ier;
2519 int port;
2520 u_char do_lf = 0;
2521 int i = 0;
2522
2523 local_irq_save(flags);
2524
2525 /* Ensure transmitter is enabled! */
2526
2527 port = 0;
2528 base_addr[CyCAR] = (u_char) port;
2529 while (base_addr[CyCCR])
2530 ;
2531 base_addr[CyCCR] = CyENB_XMTR;
2532
2533 ier = base_addr[CyIER];
2534 base_addr[CyIER] = CyTxMpty;
2535
2536 while (1) {
2537 if (pcc2chip[PccSCCTICR] & 0x20) {
2538 /* We have a Tx int. Acknowledge it */
2539 sink = pcc2chip[PccTPIACKR];
2540 if ((base_addr[CyLICR] >> 2) == port) {
2541 if (i == count) {
2542 /* Last char of string is now output */
2543 base_addr[CyTEOIR] = CyNOTRANS;
2544 break;
2545 }
2546 if (do_lf) {
2547 base_addr[CyTDR] = '\n';
2548 str++;
2549 i++;
2550 do_lf = 0;
2551 } else if (*str == '\n') {
2552 base_addr[CyTDR] = '\r';
2553 do_lf = 1;
2554 } else {
2555 base_addr[CyTDR] = *str++;
2556 i++;
2557 }
2558 base_addr[CyTEOIR] = 0;
2559 } else
2560 base_addr[CyTEOIR] = CyNOTRANS;
2561 }
2562 }
2563
2564 base_addr[CyIER] = ier;
2565
2566 local_irq_restore(flags);
2567 }
2568
2569 static struct tty_driver *serial167_console_device(struct console *c,
2570 int *index)
2571 {
2572 *index = c->index;
2573 return cy_serial_driver;
2574 }
2575
2576 static int __init serial167_console_setup(struct console *co, char *options)
2577 {
2578 return 0;
2579 }
2580
2581 static struct console sercons = {
2582 .name = "ttyS",
2583 .write = serial167_console_write,
2584 .device = serial167_console_device,
2585 .setup = serial167_console_setup,
2586 .flags = CON_PRINTBUFFER,
2587 .index = -1,
2588 };
2589
2590 static int __init serial167_console_init(void)
2591 {
2592 if (vme_brdtype == VME_TYPE_MVME166 ||
2593 vme_brdtype == VME_TYPE_MVME167 ||
2594 vme_brdtype == VME_TYPE_MVME177) {
2595 mvme167_serial_console_setup(0);
2596 register_console(&sercons);
2597 }
2598 return 0;
2599 }
2600
2601 console_initcall(serial167_console_init);
2602
2603 #ifdef CONFIG_REMOTE_DEBUG
2604 void putDebugChar(int c)
2605 {
2606 volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
2607 unsigned long flags;
2608 volatile u_char sink;
2609 u_char ier;
2610 int port;
2611
2612 local_irq_save(flags);
2613
2614 /* Ensure transmitter is enabled! */
2615
2616 port = DEBUG_PORT;
2617 base_addr[CyCAR] = (u_char) port;
2618 while (base_addr[CyCCR])
2619 ;
2620 base_addr[CyCCR] = CyENB_XMTR;
2621
2622 ier = base_addr[CyIER];
2623 base_addr[CyIER] = CyTxMpty;
2624
2625 while (1) {
2626 if (pcc2chip[PccSCCTICR] & 0x20) {
2627 /* We have a Tx int. Acknowledge it */
2628 sink = pcc2chip[PccTPIACKR];
2629 if ((base_addr[CyLICR] >> 2) == port) {
2630 base_addr[CyTDR] = c;
2631 base_addr[CyTEOIR] = 0;
2632 break;
2633 } else
2634 base_addr[CyTEOIR] = CyNOTRANS;
2635 }
2636 }
2637
2638 base_addr[CyIER] = ier;
2639
2640 local_irq_restore(flags);
2641 }
2642
2643 int getDebugChar()
2644 {
2645 volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
2646 unsigned long flags;
2647 volatile u_char sink;
2648 u_char ier;
2649 int port;
2650 int i, c;
2651
2652 i = debugiq.out;
2653 if (i != debugiq.in) {
2654 c = debugiq.buf[i];
2655 if (++i == DEBUG_LEN)
2656 i = 0;
2657 debugiq.out = i;
2658 return c;
2659 }
2660 /* OK, nothing in queue, wait in poll loop */
2661
2662 local_irq_save(flags);
2663
2664 /* Ensure receiver is enabled! */
2665
2666 port = DEBUG_PORT;
2667 base_addr[CyCAR] = (u_char) port;
2668 #if 0
2669 while (base_addr[CyCCR])
2670 ;
2671 base_addr[CyCCR] = CyENB_RCVR;
2672 #endif
2673 ier = base_addr[CyIER];
2674 base_addr[CyIER] = CyRxData;
2675
2676 while (1) {
2677 if (pcc2chip[PccSCCRICR] & 0x20) {
2678 /* We have a Rx int. Acknowledge it */
2679 sink = pcc2chip[PccRPIACKR];
2680 if ((base_addr[CyLICR] >> 2) == port) {
2681 int cnt = base_addr[CyRFOC];
2682 while (cnt-- > 0) {
2683 c = base_addr[CyRDR];
2684 if (c == 0)
2685 printk
2686 ("!! debug char is null (cnt=%d) !!",
2687 cnt);
2688 else
2689 queueDebugChar(c);
2690 }
2691 base_addr[CyREOIR] = 0;
2692 i = debugiq.out;
2693 if (i == debugiq.in)
2694 panic("Debug input queue empty!");
2695 c = debugiq.buf[i];
2696 if (++i == DEBUG_LEN)
2697 i = 0;
2698 debugiq.out = i;
2699 break;
2700 } else
2701 base_addr[CyREOIR] = CyNOTRANS;
2702 }
2703 }
2704
2705 base_addr[CyIER] = ier;
2706
2707 local_irq_restore(flags);
2708
2709 return (c);
2710 }
2711
2712 void queueDebugChar(int c)
2713 {
2714 int i;
2715
2716 i = debugiq.in;
2717 debugiq.buf[i] = c;
2718 if (++i == DEBUG_LEN)
2719 i = 0;
2720 if (i != debugiq.out)
2721 debugiq.in = i;
2722 }
2723
2724 static void debug_setup()
2725 {
2726 unsigned long flags;
2727 volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
2728 int i, cflag;
2729
2730 cflag = B19200;
2731
2732 local_irq_save(flags);
2733
2734 for (i = 0; i < 4; i++) {
2735 base_addr[CyCAR] = i;
2736 base_addr[CyLICR] = i << 2;
2737 }
2738
2739 debugiq.in = debugiq.out = 0;
2740
2741 base_addr[CyCAR] = DEBUG_PORT;
2742
2743 /* baud rate */
2744 i = cflag & CBAUD;
2745
2746 base_addr[CyIER] = 0;
2747
2748 base_addr[CyCMR] = CyASYNC;
2749 base_addr[CyLICR] = DEBUG_PORT << 2;
2750 base_addr[CyLIVR] = 0x5c;
2751
2752 /* tx and rx baud rate */
2753
2754 base_addr[CyTCOR] = baud_co[i];
2755 base_addr[CyTBPR] = baud_bpr[i];
2756 base_addr[CyRCOR] = baud_co[i] >> 5;
2757 base_addr[CyRBPR] = baud_bpr[i];
2758
2759 /* set line characteristics according configuration */
2760
2761 base_addr[CySCHR1] = 0;
2762 base_addr[CySCHR2] = 0;
2763 base_addr[CySCRL] = 0;
2764 base_addr[CySCRH] = 0;
2765 base_addr[CyCOR1] = Cy_8_BITS | CyPARITY_NONE;
2766 base_addr[CyCOR2] = 0;
2767 base_addr[CyCOR3] = Cy_1_STOP;
2768 base_addr[CyCOR4] = baud_cor4[i];
2769 base_addr[CyCOR5] = 0;
2770 base_addr[CyCOR6] = 0;
2771 base_addr[CyCOR7] = 0;
2772
2773 write_cy_cmd(base_addr, CyINIT_CHAN);
2774 write_cy_cmd(base_addr, CyENB_RCVR);
2775
2776 base_addr[CyCAR] = DEBUG_PORT; /* !!! Is this needed? */
2777
2778 base_addr[CyRTPRL] = 2;
2779 base_addr[CyRTPRH] = 0;
2780
2781 base_addr[CyMSVR1] = CyRTS;
2782 base_addr[CyMSVR2] = CyDTR;
2783
2784 base_addr[CyIER] = CyRxData;
2785
2786 local_irq_restore(flags);
2787
2788 } /* debug_setup */
2789
2790 #endif
2791
2792 MODULE_LICENSE("GPL");
Support for the Chinese Samsung S3C2440 based development boards