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[PATCH] CREDITS update
[linux-2.6/history.git] / drivers / tc / zs.c
blob2904b0a28cdadd78203f4e970c087023a5d980e8
1 /*
2 * decserial.c: Serial port driver for IOASIC DECstations.
3 *
4 * Derived from drivers/sbus/char/sunserial.c by Paul Mackerras.
5 * Derived from drivers/macintosh/macserial.c by Harald Koerfgen.
6 *
7 * DECstation changes
8 * Copyright (C) 1998-2000 Harald Koerfgen
9 * Copyright (C) 2000,2001 Maciej W. Rozycki <macro@ds2.pg.gda.pl>
10 *
11 * For the rest of the code the original Copyright applies:
12 * Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au)
13 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
14 *
15 *
16 * Note: for IOASIC systems the wiring is as follows:
17 *
18 * mouse/keyboard:
19 * DIN-7 MJ-4 signal SCC
20 * 2 1 TxD <- A.TxD
21 * 3 4 RxD -> A.RxD
22 *
23 * EIA-232/EIA-423:
24 * DB-25 MMJ-6 signal SCC
25 * 2 2 TxD <- B.TxD
26 * 3 5 RxD -> B.RxD
27 * 4 RTS <- ~A.RTS
28 * 5 CTS -> ~B.CTS
29 * 6 6 DSR -> ~A.SYNC
30 * 8 CD -> ~B.DCD
31 * 12 DSRS(DCE) -> ~A.CTS (*)
32 * 15 TxC -> B.TxC
33 * 17 RxC -> B.RxC
34 * 20 1 DTR <- ~A.DTR
35 * 22 RI -> ~A.DCD
36 * 23 DSRS(DTE) <- ~B.RTS
37 *
38 * (*) EIA-232 defines the signal at this pin to be SCD, while DSRS(DCE)
39 * is shared with DSRS(DTE) at pin 23.
40 */
41
42 #include <linux/config.h>
43 #include <linux/errno.h>
44 #include <linux/signal.h>
45 #include <linux/sched.h>
46 #include <linux/timer.h>
47 #include <linux/interrupt.h>
48 #include <linux/tty.h>
49 #include <linux/tty_flip.h>
50 #include <linux/major.h>
51 #include <linux/string.h>
52 #include <linux/fcntl.h>
53 #include <linux/mm.h>
54 #include <linux/kernel.h>
55 #include <linux/delay.h>
56 #include <linux/init.h>
57 #include <linux/ioport.h>
58 #ifdef CONFIG_SERIAL_CONSOLE
59 #include <linux/console.h>
60 #endif
61
62 #include <asm/io.h>
63 #include <asm/pgtable.h>
64 #include <asm/irq.h>
65 #include <asm/system.h>
66 #include <asm/bitops.h>
67 #include <asm/uaccess.h>
68 #include <asm/wbflush.h>
69 #include <asm/bootinfo.h>
70 #ifdef CONFIG_DECSTATION
71 #include <asm/dec/interrupts.h>
72 #include <asm/dec/machtype.h>
73 #include <asm/dec/tc.h>
74 #include <asm/dec/ioasic_addrs.h>
75 #endif
76 #ifdef CONFIG_BAGET_MIPS
77 #include <asm/baget/baget.h>
78 unsigned long system_base;
79 #endif
80 #ifdef CONFIG_KGDB
81 #include <asm/kgdb.h>
82 #endif
83 #ifdef CONFIG_MAGIC_SYSRQ
84 #include <linux/sysrq.h>
85 #endif
86
87 #include "zs.h"
88
89 /*
90 * It would be nice to dynamically allocate everything that
91 * depends on NUM_SERIAL, so we could support any number of
92 * Z8530s, but for now...
93 */
94 #define NUM_SERIAL 2 /* Max number of ZS chips supported */
95 #define NUM_CHANNELS (NUM_SERIAL * 2) /* 2 channels per chip */
96 #define CHANNEL_A_NR (zs_parms->channel_a_offset > zs_parms->channel_b_offset)
97 /* Number of channel A in the chip */
98 #define ZS_CHAN_IO_SIZE 8
99 #define ZS_CLOCK 7372800 /* Z8530 RTxC input clock rate */
100
101 #define RECOVERY_DELAY udelay(2)
102
103 struct zs_parms {
104 unsigned long scc0;
105 unsigned long scc1;
106 int channel_a_offset;
107 int channel_b_offset;
108 int irq;
109 int clock;
110 };
111
112 static struct zs_parms *zs_parms;
113
114 #ifdef CONFIG_DECSTATION
115 static struct zs_parms ds_parms = {
116 scc0 : SCC0,
117 scc1 : SCC1,
118 channel_a_offset : 1,
119 channel_b_offset : 9,
120 irq : SERIAL,
121 clock : ZS_CLOCK
122 };
123 #endif
124 #ifdef CONFIG_BAGET_MIPS
125 static struct zs_parms baget_parms = {
126 scc0 : UNI_SCC0,
127 scc1 : UNI_SCC1,
128 channel_a_offset : 9,
129 channel_b_offset : 1,
130 irq : BAGET_SCC_IRQ,
131 clock : 14745000
132 };
133 #endif
134
135 #ifdef CONFIG_DECSTATION
136 #define DS_BUS_PRESENT (IOASIC)
137 #else
138 #define DS_BUS_PRESENT 0
139 #endif
140
141 #ifdef CONFIG_BAGET_MIPS
142 #define BAGET_BUS_PRESENT (mips_machtype == MACH_BAGET202)
143 #else
144 #define BAGET_BUS_PRESENT 0
145 #endif
146
147 #define BUS_PRESENT (DS_BUS_PRESENT || BAGET_BUS_PRESENT)
148
149 struct dec_zschannel zs_channels[NUM_CHANNELS];
150 struct dec_serial zs_soft[NUM_CHANNELS];
151 int zs_channels_found;
152 struct dec_serial *zs_chain; /* list of all channels */
153
154 struct tty_struct zs_ttys[NUM_CHANNELS];
155
156 #ifdef CONFIG_SERIAL_CONSOLE
157 static struct console sercons;
158 #endif
159 #if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) \
160 && !defined(MODULE)
161 static unsigned long break_pressed; /* break, really ... */
162 #endif
163
164 static unsigned char zs_init_regs[16] __initdata = {
165 0, /* write 0 */
166 0, /* write 1 */
167 0xf0, /* write 2 */
168 (Rx8), /* write 3 */
169 (X16CLK | SB1), /* write 4 */
170 (Tx8), /* write 5 */
171 0, 0, 0, /* write 6, 7, 8 */
172 (VIS), /* write 9 */
173 (NRZ), /* write 10 */
174 (TCBR | RCBR), /* write 11 */
175 0, 0, /* BRG time constant, write 12 + 13 */
176 (BRSRC | BRENABL), /* write 14 */
177 0 /* write 15 */
178 };
179
180 DECLARE_TASK_QUEUE(tq_zs_serial);
181
182 static struct tty_driver *serial_driver;
183
184 /* serial subtype definitions */
185 #define SERIAL_TYPE_NORMAL 1
186
187 /* number of characters left in xmit buffer before we ask for more */
188 #define WAKEUP_CHARS 256
189
190 /*
191 * Debugging.
192 */
193 #undef SERIAL_DEBUG_INTR
194 #undef SERIAL_DEBUG_OPEN
195 #undef SERIAL_DEBUG_FLOW
196 #undef SERIAL_DEBUG_THROTTLE
197 #undef SERIAL_PARANOIA_CHECK
198
199 #undef ZS_DEBUG_REGS
200
201 #ifdef SERIAL_DEBUG_THROTTLE
202 #define _tty_name(tty,buf) tty_name(tty,buf)
203 #endif
204
205 #define RS_STROBE_TIME 10
206 #define RS_ISR_PASS_LIMIT 256
207
208 #define _INLINE_ inline
209
210 static void probe_sccs(void);
211 static void change_speed(struct dec_serial *info);
212 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
213
214 #ifndef MIN
215 #define MIN(a,b) ((a) < (b) ? (a) : (b))
216 #endif
217
218 /*
219 * tmp_buf is used as a temporary buffer by serial_write. We need to
220 * lock it in case the copy_from_user blocks while swapping in a page,
221 * and some other program tries to do a serial write at the same time.
222 * Since the lock will only come under contention when the system is
223 * swapping and available memory is low, it makes sense to share one
224 * buffer across all the serial ports, since it significantly saves
225 * memory if large numbers of serial ports are open.
226 */
227 static unsigned char tmp_buf[4096]; /* This is cheating */
228 static DECLARE_MUTEX(tmp_buf_sem);
229
230 static inline int serial_paranoia_check(struct dec_serial *info,
231 char *name, const char *routine)
232 {
233 #ifdef SERIAL_PARANOIA_CHECK
234 static const char *badmagic =
235 "Warning: bad magic number for serial struct %s in %s\n";
236 static const char *badinfo =
237 "Warning: null mac_serial for %s in %s\n";
238
239 if (!info) {
240 printk(badinfo, name, routine);
241 return 1;
242 }
243 if (info->magic != SERIAL_MAGIC) {
244 printk(badmagic, name, routine);
245 return 1;
246 }
247 #endif
248 return 0;
249 }
250
251 /*
252 * This is used to figure out the divisor speeds and the timeouts
253 */
254 static int baud_table[] = {
255 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
256 9600, 19200, 38400, 57600, 115200, 0 };
257
258 /*
259 * Reading and writing Z8530 registers.
260 */
261 static inline unsigned char read_zsreg(struct dec_zschannel *channel,
262 unsigned char reg)
263 {
264 unsigned char retval;
265
266 if (reg != 0) {
267 *channel->control = reg & 0xf;
268 wbflush(); RECOVERY_DELAY;
269 }
270 retval = *channel->control;
271 RECOVERY_DELAY;
272 return retval;
273 }
274
275 static inline void write_zsreg(struct dec_zschannel *channel,
276 unsigned char reg, unsigned char value)
277 {
278 if (reg != 0) {
279 *channel->control = reg & 0xf;
280 wbflush(); RECOVERY_DELAY;
281 }
282 *channel->control = value;
283 wbflush(); RECOVERY_DELAY;
284 return;
285 }
286
287 static inline unsigned char read_zsdata(struct dec_zschannel *channel)
288 {
289 unsigned char retval;
290
291 retval = *channel->data;
292 RECOVERY_DELAY;
293 return retval;
294 }
295
296 static inline void write_zsdata(struct dec_zschannel *channel,
297 unsigned char value)
298 {
299 *channel->data = value;
300 wbflush(); RECOVERY_DELAY;
301 return;
302 }
303
304 static inline void load_zsregs(struct dec_zschannel *channel,
305 unsigned char *regs)
306 {
307 /* ZS_CLEARERR(channel);
308 ZS_CLEARFIFO(channel); */
309 /* Load 'em up */
310 write_zsreg(channel, R4, regs[R4]);
311 write_zsreg(channel, R3, regs[R3] & ~RxENABLE);
312 write_zsreg(channel, R5, regs[R5] & ~TxENAB);
313 write_zsreg(channel, R9, regs[R9]);
314 write_zsreg(channel, R1, regs[R1]);
315 write_zsreg(channel, R2, regs[R2]);
316 write_zsreg(channel, R10, regs[R10]);
317 write_zsreg(channel, R11, regs[R11]);
318 write_zsreg(channel, R12, regs[R12]);
319 write_zsreg(channel, R13, regs[R13]);
320 write_zsreg(channel, R14, regs[R14]);
321 write_zsreg(channel, R15, regs[R15]);
322 write_zsreg(channel, R3, regs[R3]);
323 write_zsreg(channel, R5, regs[R5]);
324 return;
325 }
326
327 /* Sets or clears DTR/RTS on the requested line */
328 static inline void zs_rtsdtr(struct dec_serial *info, int which, int set)
329 {
330 unsigned long flags;
331
332
333 save_flags(flags); cli();
334 if (info->zs_channel != info->zs_chan_a) {
335 if (set) {
336 info->zs_chan_a->curregs[5] |= (which & (RTS | DTR));
337 } else {
338 info->zs_chan_a->curregs[5] &= ~(which & (RTS | DTR));
339 }
340 write_zsreg(info->zs_chan_a, 5, info->zs_chan_a->curregs[5]);
341 }
342 restore_flags(flags);
343 }
344
345 /* Utility routines for the Zilog */
346 static inline int get_zsbaud(struct dec_serial *ss)
347 {
348 struct dec_zschannel *channel = ss->zs_channel;
349 int brg;
350
351 /* The baud rate is split up between two 8-bit registers in
352 * what is termed 'BRG time constant' format in my docs for
353 * the chip, it is a function of the clk rate the chip is
354 * receiving which happens to be constant.
355 */
356 brg = (read_zsreg(channel, 13) << 8);
357 brg |= read_zsreg(channel, 12);
358 return BRG_TO_BPS(brg, (zs_parms->clock/(ss->clk_divisor)));
359 }
360
361 /* On receive, this clears errors and the receiver interrupts */
362 static inline void rs_recv_clear(struct dec_zschannel *zsc)
363 {
364 write_zsreg(zsc, 0, ERR_RES);
365 write_zsreg(zsc, 0, RES_H_IUS); /* XXX this is unnecessary */
366 }
367
368 /*
369 * ----------------------------------------------------------------------
370 *
371 * Here starts the interrupt handling routines. All of the following
372 * subroutines are declared as inline and are folded into
373 * rs_interrupt(). They were separated out for readability's sake.
374 *
375 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
376 * -----------------------------------------------------------------------
377 */
378
379 static int tty_break; /* Set whenever BREAK condition is detected. */
380
381 /*
382 * This routine is used by the interrupt handler to schedule
383 * processing in the software interrupt portion of the driver.
384 */
385 static _INLINE_ void rs_sched_event(struct dec_serial *info,
386 int event)
387 {
388 info->event |= 1 << event;
389 queue_task(&info->tqueue, &tq_zs_serial);
390 mark_bh(SERIAL_BH);
391 }
392
393 static _INLINE_ void receive_chars(struct dec_serial *info,
394 struct pt_regs *regs)
395 {
396 struct tty_struct *tty = info->tty;
397 unsigned char ch, stat, flag;
398
399 while ((read_zsreg(info->zs_channel, R0) & Rx_CH_AV) != 0) {
400
401 stat = read_zsreg(info->zs_channel, R1);
402 ch = read_zsdata(info->zs_channel);
403
404 if (!tty && !info->hook && !info->hook->rx_char)
405 continue;
406
407 if (tty_break) {
408 tty_break = 0;
409 #if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) && !defined(MODULE)
410 if (info->line == sercons.index) {
411 if (!break_pressed) {
412 break_pressed = jiffies;
413 goto ignore_char;
414 }
415 break_pressed = 0;
416 }
417 #endif
418 flag = TTY_BREAK;
419 if (info->flags & ZILOG_SAK)
420 do_SAK(tty);
421 } else {
422 if (stat & Rx_OVR) {
423 flag = TTY_OVERRUN;
424 } else if (stat & FRM_ERR) {
425 flag = TTY_FRAME;
426 } else if (stat & PAR_ERR) {
427 flag = TTY_PARITY;
428 } else
429 flag = 0;
430 if (flag)
431 /* reset the error indication */
432 write_zsreg(info->zs_channel, R0, ERR_RES);
433 }
434
435 #if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) && !defined(MODULE)
436 if (break_pressed && info->line == sercons.index) {
437 if (ch != 0 &&
438 time_before(jiffies, break_pressed + HZ*5)) {
439 handle_sysrq(ch, regs, NULL);
440 break_pressed = 0;
441 goto ignore_char;
442 }
443 break_pressed = 0;
444 }
445 #endif
446
447 if (info->hook && info->hook->rx_char) {
448 (*info->hook->rx_char)(ch, flag);
449 return;
450 }
451
452 if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
453 static int flip_buf_ovf;
454 ++flip_buf_ovf;
455 continue;
456 }
457 tty->flip.count++;
458 {
459 static int flip_max_cnt;
460 if (flip_max_cnt < tty->flip.count)
461 flip_max_cnt = tty->flip.count;
462 }
463
464 *tty->flip.flag_buf_ptr++ = flag;
465 *tty->flip.char_buf_ptr++ = ch;
466 ignore_char:
467 }
468 if (tty)
469 tty_flip_buffer_push(tty);
470 }
471
472 static void transmit_chars(struct dec_serial *info)
473 {
474 if ((read_zsreg(info->zs_channel, R0) & Tx_BUF_EMP) == 0)
475 return;
476 info->tx_active = 0;
477
478 if (info->x_char) {
479 /* Send next char */
480 write_zsdata(info->zs_channel, info->x_char);
481 info->x_char = 0;
482 info->tx_active = 1;
483 return;
484 }
485
486 if ((info->xmit_cnt <= 0) || (info->tty && info->tty->stopped)
487 || info->tx_stopped) {
488 write_zsreg(info->zs_channel, R0, RES_Tx_P);
489 return;
490 }
491 /* Send char */
492 write_zsdata(info->zs_channel, info->xmit_buf[info->xmit_tail++]);
493 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
494 info->xmit_cnt--;
495 info->tx_active = 1;
496
497 if (info->xmit_cnt < WAKEUP_CHARS)
498 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
499 }
500
501 static _INLINE_ void status_handle(struct dec_serial *info)
502 {
503 unsigned char stat;
504
505 /* Get status from Read Register 0 */
506 stat = read_zsreg(info->zs_channel, R0);
507
508 if (stat & BRK_ABRT) {
509 #ifdef SERIAL_DEBUG_INTR
510 printk("handling break....");
511 #endif
512 tty_break = 1;
513 }
514
515 if (info->zs_channel != info->zs_chan_a) {
516
517 /* FIXEM: Check for DCD transitions */
518 if (((stat ^ info->read_reg_zero) & DCD) != 0
519 && info->tty && !C_CLOCAL(info->tty)) {
520 if (stat & DCD) {
521 wake_up_interruptible(&info->open_wait);
522 } else {
523 tty_hangup(info->tty);
524 }
525 }
526
527 /* Check for CTS transitions */
528 if (info->tty && C_CRTSCTS(info->tty)) {
529 if ((stat & CTS) != 0) {
530 if (info->tx_stopped) {
531 info->tx_stopped = 0;
532 if (!info->tx_active)
533 transmit_chars(info);
534 }
535 } else {
536 info->tx_stopped = 1;
537 }
538 }
539
540 }
541
542 /* Clear status condition... */
543 write_zsreg(info->zs_channel, R0, RES_EXT_INT);
544 info->read_reg_zero = stat;
545 }
546
547 /*
548 * This is the serial driver's generic interrupt routine
549 */
550 void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
551 {
552 struct dec_serial *info = (struct dec_serial *) dev_id;
553 unsigned char zs_intreg;
554 int shift;
555
556 /* NOTE: The read register 3, which holds the irq status,
557 * does so for both channels on each chip. Although
558 * the status value itself must be read from the A
559 * channel and is only valid when read from channel A.
560 * Yes... broken hardware...
561 */
562 #define CHAN_IRQMASK (CHBRxIP | CHBTxIP | CHBEXT)
563
564 if (info->zs_chan_a == info->zs_channel)
565 shift = 3; /* Channel A */
566 else
567 shift = 0; /* Channel B */
568
569 for (;;) {
570 zs_intreg = read_zsreg(info->zs_chan_a, R3) >> shift;
571 if ((zs_intreg & CHAN_IRQMASK) == 0)
572 break;
573
574 if (zs_intreg & CHBRxIP) {
575 receive_chars(info, regs);
576 }
577 if (zs_intreg & CHBTxIP) {
578 transmit_chars(info);
579 }
580 if (zs_intreg & CHBEXT) {
581 status_handle(info);
582 }
583 }
584
585 /* Why do we need this ? */
586 write_zsreg(info->zs_channel, 0, RES_H_IUS);
587 }
588
589 #ifdef ZS_DEBUG_REGS
590 void zs_dump (void) {
591 int i, j;
592 for (i = 0; i < zs_channels_found; i++) {
593 struct dec_zschannel *ch = &zs_channels[i];
594 if ((long)ch->control == UNI_IO_BASE+UNI_SCC1A_CTRL) {
595 for (j = 0; j < 15; j++) {
596 printk("W%d = 0x%x\t",
597 j, (int)ch->curregs[j]);
598 }
599 for (j = 0; j < 15; j++) {
600 printk("R%d = 0x%x\t",
601 j, (int)read_zsreg(ch,j));
602 }
603 printk("\n\n");
604 }
605 }
606 }
607 #endif
608
609 /*
610 * -------------------------------------------------------------------
611 * Here ends the serial interrupt routines.
612 * -------------------------------------------------------------------
613 */
614
615 /*
616 * ------------------------------------------------------------
617 * rs_stop() and rs_start()
618 *
619 * This routines are called before setting or resetting tty->stopped.
620 * ------------------------------------------------------------
621 */
622 static void rs_stop(struct tty_struct *tty)
623 {
624 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
625 unsigned long flags;
626
627 if (serial_paranoia_check(info, tty->name, "rs_stop"))
628 return;
629
630 #if 1
631 save_flags(flags); cli();
632 if (info->zs_channel->curregs[5] & TxENAB) {
633 info->zs_channel->curregs[5] &= ~TxENAB;
634 write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
635 }
636 restore_flags(flags);
637 #endif
638 }
639
640 static void rs_start(struct tty_struct *tty)
641 {
642 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
643 unsigned long flags;
644
645 if (serial_paranoia_check(info, tty->name, "rs_start"))
646 return;
647
648 save_flags(flags); cli();
649 #if 1
650 if (info->xmit_cnt && info->xmit_buf && !(info->zs_channel->curregs[5] & TxENAB)) {
651 info->zs_channel->curregs[5] |= TxENAB;
652 write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
653 }
654 #else
655 if (info->xmit_cnt && info->xmit_buf && !info->tx_active) {
656 transmit_chars(info);
657 }
658 #endif
659 restore_flags(flags);
660 }
661
662 /*
663 * This routine is used to handle the "bottom half" processing for the
664 * serial driver, known also the "software interrupt" processing.
665 * This processing is done at the kernel interrupt level, after the
666 * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
667 * is where time-consuming activities which can not be done in the
668 * interrupt driver proper are done; the interrupt driver schedules
669 * them using rs_sched_event(), and they get done here.
670 */
671 static void do_serial_bh(void)
672 {
673 run_task_queue(&tq_zs_serial);
674 }
675
676 static void do_softint(void *private_)
677 {
678 struct dec_serial *info = (struct dec_serial *) private_;
679 struct tty_struct *tty;
680
681 tty = info->tty;
682 if (!tty)
683 return;
684
685 if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
686 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
687 tty->ldisc.write_wakeup)
688 (tty->ldisc.write_wakeup)(tty);
689 wake_up_interruptible(&tty->write_wait);
690 }
691 }
692
693 int zs_startup(struct dec_serial * info)
694 {
695 unsigned long flags;
696
697 if (info->flags & ZILOG_INITIALIZED)
698 return 0;
699
700 if (!info->xmit_buf) {
701 info->xmit_buf = (unsigned char *) get_zeroed_page(GFP_KERNEL);
702 if (!info->xmit_buf)
703 return -ENOMEM;
704 }
705
706 save_flags(flags); cli();
707
708 #ifdef SERIAL_DEBUG_OPEN
709 printk("starting up ttyS%02d (irq %d)...", info->line, info->irq);
710 #endif
711
712 /*
713 * Clear the receive FIFO.
714 */
715 ZS_CLEARFIFO(info->zs_channel);
716 info->xmit_fifo_size = 1;
717
718 /*
719 * Clear the interrupt registers.
720 */
721 write_zsreg(info->zs_channel, 0, ERR_RES);
722 write_zsreg(info->zs_channel, 0, RES_H_IUS);
723
724 /*
725 * Turn on RTS and DTR.
726 */
727 zs_rtsdtr(info, RTS | DTR, 1);
728
729 /*
730 * Finally, enable sequencing and interrupts
731 */
732 info->zs_channel->curregs[1] = (info->zs_channel->curregs[1] & ~0x18) | (EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB);
733 info->zs_channel->curregs[3] |= (RxENABLE | Rx8);
734 info->zs_channel->curregs[5] |= (TxENAB | Tx8);
735 info->zs_channel->curregs[15] |= (DCDIE | CTSIE | TxUIE | BRKIE);
736 info->zs_channel->curregs[9] |= (VIS | MIE);
737 write_zsreg(info->zs_channel, 1, info->zs_channel->curregs[1]);
738 write_zsreg(info->zs_channel, 3, info->zs_channel->curregs[3]);
739 write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
740 write_zsreg(info->zs_channel, 15, info->zs_channel->curregs[15]);
741 write_zsreg(info->zs_channel, 9, info->zs_channel->curregs[9]);
742
743 /*
744 * And clear the interrupt registers again for luck.
745 */
746 write_zsreg(info->zs_channel, 0, ERR_RES);
747 write_zsreg(info->zs_channel, 0, RES_H_IUS);
748
749 if (info->tty)
750 clear_bit(TTY_IO_ERROR, &info->tty->flags);
751 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
752
753 /*
754 * Set the speed of the serial port
755 */
756 change_speed(info);
757
758 /* Save the current value of RR0 */
759 info->read_reg_zero = read_zsreg(info->zs_channel, 0);
760
761 info->flags |= ZILOG_INITIALIZED;
762 restore_flags(flags);
763 return 0;
764 }
765
766 /*
767 * This routine will shutdown a serial port; interrupts are disabled, and
768 * DTR is dropped if the hangup on close termio flag is on.
769 */
770 static void shutdown(struct dec_serial * info)
771 {
772 unsigned long flags;
773
774 if (!(info->flags & ZILOG_INITIALIZED))
775 return;
776
777 #ifdef SERIAL_DEBUG_OPEN
778 printk("Shutting down serial port %d (irq %d)....", info->line,
779 info->irq);
780 #endif
781
782 save_flags(flags); cli(); /* Disable interrupts */
783
784 if (info->xmit_buf) {
785 free_page((unsigned long) info->xmit_buf);
786 info->xmit_buf = 0;
787 }
788
789 info->zs_channel->curregs[1] = 0;
790 write_zsreg(info->zs_channel, 1, info->zs_channel->curregs[1]); /* no interrupts */
791
792 info->zs_channel->curregs[3] &= ~RxENABLE;
793 write_zsreg(info->zs_channel, 3, info->zs_channel->curregs[3]);
794
795 info->zs_channel->curregs[5] &= ~TxENAB;
796 write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
797 if (!info->tty || C_HUPCL(info->tty)) {
798 zs_rtsdtr(info, RTS | DTR, 0);
799 }
800
801 if (info->tty)
802 set_bit(TTY_IO_ERROR, &info->tty->flags);
803
804 info->flags &= ~ZILOG_INITIALIZED;
805 restore_flags(flags);
806 }
807
808 /*
809 * This routine is called to set the UART divisor registers to match
810 * the specified baud rate for a serial port.
811 */
812 static void change_speed(struct dec_serial *info)
813 {
814 unsigned cflag;
815 int i;
816 int brg, bits;
817 unsigned long flags;
818
819 if (!info->hook) {
820 if (!info->tty || !info->tty->termios)
821 return;
822 cflag = info->tty->termios->c_cflag;
823 if (!info->port)
824 return;
825 } else {
826 cflag = info->hook->cflags;
827 }
828
829 i = cflag & CBAUD;
830 if (i & CBAUDEX) {
831 i &= ~CBAUDEX;
832 if (i < 1 || i > 2) {
833 if (!info->hook)
834 info->tty->termios->c_cflag &= ~CBAUDEX;
835 else
836 info->hook->cflags &= ~CBAUDEX;
837 } else
838 i += 15;
839 }
840
841 save_flags(flags); cli();
842 info->zs_baud = baud_table[i];
843 info->clk_divisor = 16;
844 if (info->zs_baud) {
845 info->zs_channel->curregs[4] = X16CLK;
846 brg = BPS_TO_BRG(info->zs_baud, zs_parms->clock/info->clk_divisor);
847 info->zs_channel->curregs[12] = (brg & 255);
848 info->zs_channel->curregs[13] = ((brg >> 8) & 255);
849 zs_rtsdtr(info, DTR, 1);
850 } else {
851 zs_rtsdtr(info, RTS | DTR, 0);
852 return;
853 }
854
855 /* byte size and parity */
856 info->zs_channel->curregs[3] &= ~RxNBITS_MASK;
857 info->zs_channel->curregs[5] &= ~TxNBITS_MASK;
858 switch (cflag & CSIZE) {
859 case CS5:
860 bits = 7;
861 info->zs_channel->curregs[3] |= Rx5;
862 info->zs_channel->curregs[5] |= Tx5;
863 break;
864 case CS6:
865 bits = 8;
866 info->zs_channel->curregs[3] |= Rx6;
867 info->zs_channel->curregs[5] |= Tx6;
868 break;
869 case CS7:
870 bits = 9;
871 info->zs_channel->curregs[3] |= Rx7;
872 info->zs_channel->curregs[5] |= Tx7;
873 break;
874 case CS8:
875 default: /* defaults to 8 bits */
876 bits = 10;
877 info->zs_channel->curregs[3] |= Rx8;
878 info->zs_channel->curregs[5] |= Tx8;
879 break;
880 }
881
882 info->timeout = ((info->xmit_fifo_size*HZ*bits) / info->zs_baud);
883 info->timeout += HZ/50; /* Add .02 seconds of slop */
884
885 info->zs_channel->curregs[4] &= ~(SB_MASK | PAR_ENA | PAR_EVEN);
886 if (cflag & CSTOPB) {
887 info->zs_channel->curregs[4] |= SB2;
888 } else {
889 info->zs_channel->curregs[4] |= SB1;
890 }
891 if (cflag & PARENB) {
892 info->zs_channel->curregs[4] |= PAR_ENA;
893 }
894 if (!(cflag & PARODD)) {
895 info->zs_channel->curregs[4] |= PAR_EVEN;
896 }
897
898 if (!(cflag & CLOCAL)) {
899 if (!(info->zs_channel->curregs[15] & DCDIE))
900 info->read_reg_zero = read_zsreg(info->zs_channel, 0);
901 info->zs_channel->curregs[15] |= DCDIE;
902 } else
903 info->zs_channel->curregs[15] &= ~DCDIE;
904 if (cflag & CRTSCTS) {
905 info->zs_channel->curregs[15] |= CTSIE;
906 if ((read_zsreg(info->zs_channel, 0) & CTS) == 0)
907 info->tx_stopped = 1;
908 } else {
909 info->zs_channel->curregs[15] &= ~CTSIE;
910 info->tx_stopped = 0;
911 }
912
913 /* Load up the new values */
914 load_zsregs(info->zs_channel, info->zs_channel->curregs);
915
916 restore_flags(flags);
917 }
918
919 static void rs_flush_chars(struct tty_struct *tty)
920 {
921 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
922 unsigned long flags;
923
924 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
925 return;
926
927 if (info->xmit_cnt <= 0 || tty->stopped || info->tx_stopped ||
928 !info->xmit_buf)
929 return;
930
931 /* Enable transmitter */
932 save_flags(flags); cli();
933 transmit_chars(info);
934 restore_flags(flags);
935 }
936
937 static int rs_write(struct tty_struct * tty, int from_user,
938 const unsigned char *buf, int count)
939 {
940 int c, total = 0;
941 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
942 unsigned long flags;
943
944 if (serial_paranoia_check(info, tty->name, "rs_write"))
945 return 0;
946
947 if (!tty || !info->xmit_buf)
948 return 0;
949
950 save_flags(flags);
951 while (1) {
952 cli();
953 c = MIN(count, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
954 SERIAL_XMIT_SIZE - info->xmit_head));
955 if (c <= 0)
956 break;
957
958 if (from_user) {
959 down(&tmp_buf_sem);
960 copy_from_user(tmp_buf, buf, c);
961 c = MIN(c, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
962 SERIAL_XMIT_SIZE - info->xmit_head));
963 memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c);
964 up(&tmp_buf_sem);
965 } else
966 memcpy(info->xmit_buf + info->xmit_head, buf, c);
967 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
968 info->xmit_cnt += c;
969 restore_flags(flags);
970 buf += c;
971 count -= c;
972 total += c;
973 }
974
975 if (info->xmit_cnt && !tty->stopped && !info->tx_stopped
976 && !info->tx_active)
977 transmit_chars(info);
978 restore_flags(flags);
979 return total;
980 }
981
982 static int rs_write_room(struct tty_struct *tty)
983 {
984 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
985 int ret;
986
987 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
988 return 0;
989 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
990 if (ret < 0)
991 ret = 0;
992 return ret;
993 }
994
995 static int rs_chars_in_buffer(struct tty_struct *tty)
996 {
997 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
998
999 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
1000 return 0;
1001 return info->xmit_cnt;
1002 }
1003
1004 static void rs_flush_buffer(struct tty_struct *tty)
1005 {
1006 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
1007
1008 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
1009 return;
1010 cli();
1011 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1012 sti();
1013 wake_up_interruptible(&tty->write_wait);
1014 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
1015 tty->ldisc.write_wakeup)
1016 (tty->ldisc.write_wakeup)(tty);
1017 }
1018
1019 /*
1020 * ------------------------------------------------------------
1021 * rs_throttle()
1022 *
1023 * This routine is called by the upper-layer tty layer to signal that
1024 * incoming characters should be throttled.
1025 * ------------------------------------------------------------
1026 */
1027 static void rs_throttle(struct tty_struct * tty)
1028 {
1029 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
1030 unsigned long flags;
1031
1032 #ifdef SERIAL_DEBUG_THROTTLE
1033 char buf[64];
1034
1035 printk("throttle %s: %d....\n", _tty_name(tty, buf),
1036 tty->ldisc.chars_in_buffer(tty));
1037 #endif
1038
1039 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1040 return;
1041
1042 if (I_IXOFF(tty)) {
1043 save_flags(flags); cli();
1044 info->x_char = STOP_CHAR(tty);
1045 if (!info->tx_active)
1046 transmit_chars(info);
1047 restore_flags(flags);
1048 }
1049
1050 if (C_CRTSCTS(tty)) {
1051 zs_rtsdtr(info, RTS, 0);
1052 }
1053 }
1054
1055 static void rs_unthrottle(struct tty_struct * tty)
1056 {
1057 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
1058 unsigned long flags;
1059
1060 #ifdef SERIAL_DEBUG_THROTTLE
1061 char buf[64];
1062
1063 printk("unthrottle %s: %d....\n", _tty_name(tty, buf),
1064 tty->ldisc.chars_in_buffer(tty));
1065 #endif
1066
1067 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1068 return;
1069
1070 if (I_IXOFF(tty)) {
1071 save_flags(flags); cli();
1072 if (info->x_char)
1073 info->x_char = 0;
1074 else {
1075 info->x_char = START_CHAR(tty);
1076 if (!info->tx_active)
1077 transmit_chars(info);
1078 }
1079 restore_flags(flags);
1080 }
1081
1082 if (C_CRTSCTS(tty)) {
1083 zs_rtsdtr(info, RTS, 1);
1084 }
1085 }
1086
1087 /*
1088 * ------------------------------------------------------------
1089 * rs_ioctl() and friends
1090 * ------------------------------------------------------------
1091 */
1092
1093 static int get_serial_info(struct dec_serial * info,
1094 struct serial_struct * retinfo)
1095 {
1096 struct serial_struct tmp;
1097
1098 if (!retinfo)
1099 return -EFAULT;
1100 memset(&tmp, 0, sizeof(tmp));
1101 tmp.type = info->type;
1102 tmp.line = info->line;
1103 tmp.port = info->port;
1104 tmp.irq = info->irq;
1105 tmp.flags = info->flags;
1106 tmp.baud_base = info->baud_base;
1107 tmp.close_delay = info->close_delay;
1108 tmp.closing_wait = info->closing_wait;
1109 tmp.custom_divisor = info->custom_divisor;
1110 return copy_to_user(retinfo,&tmp,sizeof(*retinfo)) ? -EFAULT : 0;
1111 }
1112
1113 static int set_serial_info(struct dec_serial * info,
1114 struct serial_struct * new_info)
1115 {
1116 struct serial_struct new_serial;
1117 struct dec_serial old_info;
1118 int retval = 0;
1119
1120 if (!new_info)
1121 return -EFAULT;
1122 copy_from_user(&new_serial,new_info,sizeof(new_serial));
1123 old_info = *info;
1124
1125 if (!capable(CAP_SYS_ADMIN)) {
1126 if ((new_serial.baud_base != info->baud_base) ||
1127 (new_serial.type != info->type) ||
1128 (new_serial.close_delay != info->close_delay) ||
1129 ((new_serial.flags & ~ZILOG_USR_MASK) !=
1130 (info->flags & ~ZILOG_USR_MASK)))
1131 return -EPERM;
1132 info->flags = ((info->flags & ~ZILOG_USR_MASK) |
1133 (new_serial.flags & ZILOG_USR_MASK));
1134 info->custom_divisor = new_serial.custom_divisor;
1135 goto check_and_exit;
1136 }
1137
1138 if (info->count > 1)
1139 return -EBUSY;
1140
1141 /*
1142 * OK, past this point, all the error checking has been done.
1143 * At this point, we start making changes.....
1144 */
1145
1146 info->baud_base = new_serial.baud_base;
1147 info->flags = ((info->flags & ~ZILOG_FLAGS) |
1148 (new_serial.flags & ZILOG_FLAGS));
1149 info->type = new_serial.type;
1150 info->close_delay = new_serial.close_delay;
1151 info->closing_wait = new_serial.closing_wait;
1152
1153 check_and_exit:
1154 retval = zs_startup(info);
1155 return retval;
1156 }
1157
1158 /*
1159 * get_lsr_info - get line status register info
1160 *
1161 * Purpose: Let user call ioctl() to get info when the UART physically
1162 * is emptied. On bus types like RS485, the transmitter must
1163 * release the bus after transmitting. This must be done when
1164 * the transmit shift register is empty, not be done when the
1165 * transmit holding register is empty. This functionality
1166 * allows an RS485 driver to be written in user space.
1167 */
1168 static int get_lsr_info(struct dec_serial * info, unsigned int *value)
1169 {
1170 unsigned char status;
1171
1172 cli();
1173 status = read_zsreg(info->zs_channel, 0);
1174 sti();
1175 put_user(status,value);
1176 return 0;
1177 }
1178
1179 static int rs_tiocmget(struct tty_struct *tty, struct file *file)
1180 {
1181 struct dec_serial * info = (struct dec_serial *)tty->driver_data;
1182 unsigned char control, status_a, status_b;
1183 unsigned int result;
1184
1185 if (info->hook)
1186 return -ENODEV;
1187
1188 if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1189 return -ENODEV;
1190
1191 if (tty->flags & (1 << TTY_IO_ERROR))
1192 return -EIO;
1193
1194 if (info->zs_channel == info->zs_chan_a)
1195 result = 0;
1196 else {
1197 cli();
1198 control = info->zs_chan_a->curregs[5];
1199 status_a = read_zsreg(info->zs_chan_a, 0);
1200 status_b = read_zsreg(info->zs_channel, 0);
1201 sti();
1202 result = ((control & RTS) ? TIOCM_RTS: 0)
1203 | ((control & DTR) ? TIOCM_DTR: 0)
1204 | ((status_b & DCD) ? TIOCM_CAR: 0)
1205 | ((status_a & DCD) ? TIOCM_RNG: 0)
1206 | ((status_a & SYNC_HUNT) ? TIOCM_DSR: 0)
1207 | ((status_b & CTS) ? TIOCM_CTS: 0);
1208 }
1209 return result;
1210 }
1211
1212 static int rs_tiocmset(struct tty_struct *tty, struct file *file,
1213 unsigned int set, unsigned int clear)
1214 {
1215 struct dec_serial * info = (struct dec_serial *)tty->driver_data;
1216 int error;
1217 unsigned int arg, bits;
1218
1219 if (info->hook)
1220 return -ENODEV;
1221
1222 if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1223 return -ENODEV;
1224
1225 if (tty->flags & (1 << TTY_IO_ERROR))
1226 return -EIO;
1227
1228 if (info->zs_channel == info->zs_chan_a)
1229 return 0;
1230
1231 cli();
1232 if (set & TIOCM_RTS)
1233 info->zs_chan_a->curregs[5] |= RTS;
1234 if (set & TIOCM_DTR)
1235 info->zs_chan_a->curregs[5] |= DTR;
1236 if (clear & TIOCM_RTS)
1237 info->zs_chan_a->curregs[5] &= ~RTS;
1238 if (clear & TIOCM_DTR)
1239 info->zs_chan_a->curregs[5] &= ~DTR;
1240 write_zsreg(info->zs_chan_a, 5, info->zs_chan_a->curregs[5]);
1241 sti();
1242 return 0;
1243 }
1244
1245 /*
1246 * rs_break - turn transmit break condition on/off
1247 */
1248 static void rs_break(struct tty_struct *tty, int break_state)
1249 {
1250 struct dec_serial *info = (struct dec_serial *) tty->driver_data;
1251 unsigned long flags;
1252
1253 if (serial_paranoia_check(info, tty->name, "rs_break"))
1254 return;
1255 if (!info->port)
1256 return;
1257
1258 save_flags(flags); cli();
1259 if (break_state == -1)
1260 info->zs_channel->curregs[5] |= SND_BRK;
1261 else
1262 info->zs_channel->curregs[5] &= ~SND_BRK;
1263 write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
1264 restore_flags(flags);
1265 }
1266
1267 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1268 unsigned int cmd, unsigned long arg)
1269 {
1270 int error;
1271 struct dec_serial * info = (struct dec_serial *)tty->driver_data;
1272
1273 if (info->hook)
1274 return -ENODEV;
1275
1276 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1277 return -ENODEV;
1278
1279 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1280 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
1281 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
1282 if (tty->flags & (1 << TTY_IO_ERROR))
1283 return -EIO;
1284 }
1285
1286 switch (cmd) {
1287 case TIOCGSERIAL:
1288 error = verify_area(VERIFY_WRITE, (void *) arg,
1289 sizeof(struct serial_struct));
1290 if (error)
1291 return error;
1292 return get_serial_info(info,
1293 (struct serial_struct *) arg);
1294 case TIOCSSERIAL:
1295 return set_serial_info(info,
1296 (struct serial_struct *) arg);
1297 case TIOCSERGETLSR: /* Get line status register */
1298 error = verify_area(VERIFY_WRITE, (void *) arg,
1299 sizeof(unsigned int));
1300 if (error)
1301 return error;
1302 else
1303 return get_lsr_info(info, (unsigned int *) arg);
1304
1305 case TIOCSERGSTRUCT:
1306 error = verify_area(VERIFY_WRITE, (void *) arg,
1307 sizeof(struct dec_serial));
1308 if (error)
1309 return error;
1310 copy_from_user((struct dec_serial *) arg,
1311 info, sizeof(struct dec_serial));
1312 return 0;
1313
1314 default:
1315 return -ENOIOCTLCMD;
1316 }
1317 return 0;
1318 }
1319
1320 static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
1321 {
1322 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
1323 int was_stopped;
1324
1325 if (tty->termios->c_cflag == old_termios->c_cflag)
1326 return;
1327 was_stopped = info->tx_stopped;
1328
1329 change_speed(info);
1330
1331 if (was_stopped && !info->tx_stopped)
1332 rs_start(tty);
1333 }
1334
1335 /*
1336 * ------------------------------------------------------------
1337 * rs_close()
1338 *
1339 * This routine is called when the serial port gets closed.
1340 * Wait for the last remaining data to be sent.
1341 * ------------------------------------------------------------
1342 */
1343 static void rs_close(struct tty_struct *tty, struct file * filp)
1344 {
1345 struct dec_serial * info = (struct dec_serial *)tty->driver_data;
1346 unsigned long flags;
1347
1348 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1349 return;
1350
1351 save_flags(flags); cli();
1352
1353 if (tty_hung_up_p(filp)) {
1354 restore_flags(flags);
1355 return;
1356 }
1357
1358 #ifdef SERIAL_DEBUG_OPEN
1359 printk("rs_close ttyS%02d, count = %d\n", info->line, info->count);
1360 #endif
1361 if ((tty->count == 1) && (info->count != 1)) {
1362 /*
1363 * Uh, oh. tty->count is 1, which means that the tty
1364 * structure will be freed. Info->count should always
1365 * be one in these conditions. If it's greater than
1366 * one, we've got real problems, since it means the
1367 * serial port won't be shutdown.
1368 */
1369 printk("rs_close: bad serial port count; tty->count is 1, "
1370 "info->count is %d\n", info->count);
1371 info->count = 1;
1372 }
1373 if (--info->count < 0) {
1374 printk("rs_close: bad serial port count for ttyS%02d: %d\n",
1375 info->line, info->count);
1376 info->count = 0;
1377 }
1378 if (info->count) {
1379 restore_flags(flags);
1380 return;
1381 }
1382 info->flags |= ZILOG_CLOSING;
1383 /*
1384 * Now we wait for the transmit buffer to clear; and we notify
1385 * the line discipline to only process XON/XOFF characters.
1386 */
1387 tty->closing = 1;
1388 if (info->closing_wait != ZILOG_CLOSING_WAIT_NONE)
1389 tty_wait_until_sent(tty, info->closing_wait);
1390 /*
1391 * At this point we stop accepting input. To do this, we
1392 * disable the receiver and receive interrupts.
1393 */
1394 info->zs_channel->curregs[3] &= ~RxENABLE;
1395 write_zsreg(info->zs_channel, 3, info->zs_channel->curregs[3]);
1396 info->zs_channel->curregs[1] = 0; /* disable any rx ints */
1397 write_zsreg(info->zs_channel, 1, info->zs_channel->curregs[1]);
1398 ZS_CLEARFIFO(info->zs_channel);
1399 if (info->flags & ZILOG_INITIALIZED) {
1400 /*
1401 * Before we drop DTR, make sure the SCC transmitter
1402 * has completely drained.
1403 */
1404 rs_wait_until_sent(tty, info->timeout);
1405 }
1406
1407 shutdown(info);
1408 if (tty->driver->flush_buffer)
1409 tty->driver->flush_buffer(tty);
1410 if (tty->ldisc.flush_buffer)
1411 tty->ldisc.flush_buffer(tty);
1412 tty->closing = 0;
1413 info->event = 0;
1414 info->tty = 0;
1415 if (info->blocked_open) {
1416 if (info->close_delay) {
1417 current->state = TASK_INTERRUPTIBLE;
1418 schedule_timeout(info->close_delay);
1419 }
1420 wake_up_interruptible(&info->open_wait);
1421 }
1422 info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CLOSING);
1423 wake_up_interruptible(&info->close_wait);
1424 restore_flags(flags);
1425 }
1426
1427 /*
1428 * rs_wait_until_sent() --- wait until the transmitter is empty
1429 */
1430 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1431 {
1432 struct dec_serial *info = (struct dec_serial *) tty->driver_data;
1433 unsigned long orig_jiffies, char_time;
1434
1435 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1436 return;
1437
1438 orig_jiffies = jiffies;
1439 /*
1440 * Set the check interval to be 1/5 of the estimated time to
1441 * send a single character, and make it at least 1. The check
1442 * interval should also be less than the timeout.
1443 */
1444 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1445 char_time = char_time / 5;
1446 if (char_time == 0)
1447 char_time = 1;
1448 if (timeout)
1449 char_time = MIN(char_time, timeout);
1450 while ((read_zsreg(info->zs_channel, 1) & Tx_BUF_EMP) == 0) {
1451 current->state = TASK_INTERRUPTIBLE;
1452 schedule_timeout(char_time);
1453 if (signal_pending(current))
1454 break;
1455 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1456 break;
1457 }
1458 current->state = TASK_RUNNING;
1459 }
1460
1461 /*
1462 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1463 */
1464 void rs_hangup(struct tty_struct *tty)
1465 {
1466 struct dec_serial * info = (struct dec_serial *)tty->driver_data;
1467
1468 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1469 return;
1470
1471 rs_flush_buffer(tty);
1472 shutdown(info);
1473 info->event = 0;
1474 info->count = 0;
1475 info->flags &= ~ZILOG_NORMAL_ACTIVE;
1476 info->tty = 0;
1477 wake_up_interruptible(&info->open_wait);
1478 }
1479
1480 /*
1481 * ------------------------------------------------------------
1482 * rs_open() and friends
1483 * ------------------------------------------------------------
1484 */
1485 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1486 struct dec_serial *info)
1487 {
1488 DECLARE_WAITQUEUE(wait, current);
1489 int retval;
1490 int do_clocal = 0;
1491
1492 /*
1493 * If the device is in the middle of being closed, then block
1494 * until it's done, and then try again.
1495 */
1496 if (info->flags & ZILOG_CLOSING) {
1497 interruptible_sleep_on(&info->close_wait);
1498 #ifdef SERIAL_DO_RESTART
1499 return ((info->flags & ZILOG_HUP_NOTIFY) ?
1500 -EAGAIN : -ERESTARTSYS);
1501 #else
1502 return -EAGAIN;
1503 #endif
1504 }
1505
1506 /*
1507 * If this is a callout device, then just make sure the normal
1508 * device isn't being used.
1509 */
1510
1511 /*
1512 * If non-blocking mode is set, or the port is not enabled,
1513 * then make the check up front and then exit.
1514 */
1515 if ((filp->f_flags & O_NONBLOCK) ||
1516 (tty->flags & (1 << TTY_IO_ERROR))) {
1517 info->flags |= ZILOG_NORMAL_ACTIVE;
1518 return 0;
1519 }
1520
1521 if (tty->termios->c_cflag & CLOCAL)
1522 do_clocal = 1;
1523
1524 /*
1525 * Block waiting for the carrier detect and the line to become
1526 * free (i.e., not in use by the callout). While we are in
1527 * this loop, info->count is dropped by one, so that
1528 * rs_close() knows when to free things. We restore it upon
1529 * exit, either normal or abnormal.
1530 */
1531 retval = 0;
1532 add_wait_queue(&info->open_wait, &wait);
1533 #ifdef SERIAL_DEBUG_OPEN
1534 printk("block_til_ready before block: ttyS%02d, count = %d\n",
1535 info->line, info->count);
1536 #endif
1537 cli();
1538 if (!tty_hung_up_p(filp))
1539 info->count--;
1540 sti();
1541 info->blocked_open++;
1542 while (1) {
1543 cli();
1544 if (tty->termios->c_cflag & CBAUD)
1545 zs_rtsdtr(info, RTS | DTR, 1);
1546 sti();
1547 set_current_state(TASK_INTERRUPTIBLE);
1548 if (tty_hung_up_p(filp) ||
1549 !(info->flags & ZILOG_INITIALIZED)) {
1550 #ifdef SERIAL_DO_RESTART
1551 if (info->flags & ZILOG_HUP_NOTIFY)
1552 retval = -EAGAIN;
1553 else
1554 retval = -ERESTARTSYS;
1555 #else
1556 retval = -EAGAIN;
1557 #endif
1558 break;
1559 }
1560 if (!(info->flags & ZILOG_CLOSING) &&
1561 (do_clocal || (read_zsreg(info->zs_channel, 0) & DCD)))
1562 break;
1563 if (signal_pending(current)) {
1564 retval = -ERESTARTSYS;
1565 break;
1566 }
1567 #ifdef SERIAL_DEBUG_OPEN
1568 printk("block_til_ready blocking: ttyS%02d, count = %d\n",
1569 info->line, info->count);
1570 #endif
1571 schedule();
1572 }
1573 current->state = TASK_RUNNING;
1574 remove_wait_queue(&info->open_wait, &wait);
1575 if (!tty_hung_up_p(filp))
1576 info->count++;
1577 info->blocked_open--;
1578 #ifdef SERIAL_DEBUG_OPEN
1579 printk("block_til_ready after blocking: ttyS%02d, count = %d\n",
1580 info->line, info->count);
1581 #endif
1582 if (retval)
1583 return retval;
1584 info->flags |= ZILOG_NORMAL_ACTIVE;
1585 return 0;
1586 }
1587
1588 /*
1589 * This routine is called whenever a serial port is opened. It
1590 * enables interrupts for a serial port, linking in its ZILOG structure into
1591 * the IRQ chain. It also performs the serial-specific
1592 * initialization for the tty structure.
1593 */
1594 int rs_open(struct tty_struct *tty, struct file * filp)
1595 {
1596 struct dec_serial *info;
1597 int retval, line;
1598
1599 line = tty->index;
1600 if ((line < 0) || (line >= zs_channels_found))
1601 return -ENODEV;
1602 info = zs_soft + line;
1603
1604 if (info->hook)
1605 return -ENODEV;
1606
1607 if (serial_paranoia_check(info, tty->name, "rs_open"))
1608 return -ENODEV;
1609 #ifdef SERIAL_DEBUG_OPEN
1610 printk("rs_open %s, count = %d\n", tty->name, info->count);
1611 #endif
1612
1613 info->count++;
1614 tty->driver_data = info;
1615 info->tty = tty;
1616
1617 /*
1618 * If the port is the middle of closing, bail out now
1619 */
1620 if (tty_hung_up_p(filp) ||
1621 (info->flags & ZILOG_CLOSING)) {
1622 if (info->flags & ZILOG_CLOSING)
1623 interruptible_sleep_on(&info->close_wait);
1624 #ifdef SERIAL_DO_RESTART
1625 return ((info->flags & ZILOG_HUP_NOTIFY) ?
1626 -EAGAIN : -ERESTARTSYS);
1627 #else
1628 return -EAGAIN;
1629 #endif
1630 }
1631
1632 /*
1633 * Start up serial port
1634 */
1635 retval = zs_startup(info);
1636 if (retval)
1637 return retval;
1638
1639 retval = block_til_ready(tty, filp, info);
1640 if (retval) {
1641 #ifdef SERIAL_DEBUG_OPEN
1642 printk("rs_open returning after block_til_ready with %d\n",
1643 retval);
1644 #endif
1645 return retval;
1646 }
1647
1648 #ifdef CONFIG_SERIAL_CONSOLE
1649 if (sercons.cflag && sercons.index == line) {
1650 tty->termios->c_cflag = sercons.cflag;
1651 sercons.cflag = 0;
1652 change_speed(info);
1653 }
1654 #endif
1655
1656 #ifdef SERIAL_DEBUG_OPEN
1657 printk("rs_open %s successful...", tty->name);
1658 #endif
1659 /* tty->low_latency = 1; */
1660 return 0;
1661 }
1662
1663 /* Finally, routines used to initialize the serial driver. */
1664
1665 static void __init show_serial_version(void)
1666 {
1667 printk("DECstation Z8530 serial driver version 0.05\n");
1668 }
1669
1670 /* Initialize Z8530s zs_channels
1671 */
1672
1673 static void __init probe_sccs(void)
1674 {
1675 struct dec_serial **pp;
1676 int i, n, n_chips = 0, n_channels, chip, channel;
1677
1678 /*
1679 * did we get here by accident?
1680 */
1681 if(!BUS_PRESENT) {
1682 printk("Not on JUNKIO machine, skipping probe_sccs\n");
1683 return;
1684 }
1685
1686 /*
1687 * When serial console is activated, tc_init has not been called yet
1688 * and system_base is undefined. Unfortunately we have to hardcode
1689 * system_base for this case :-(. HK
1690 */
1691 switch(mips_machtype) {
1692 #ifdef CONFIG_DECSTATION
1693 case MACH_DS5000_2X0:
1694 system_base = 0xbf800000;
1695 n_chips = 2;
1696 zs_parms = &ds_parms;
1697 break;
1698 case MACH_DS5000_1XX:
1699 system_base = 0xbc000000;
1700 n_chips = 2;
1701 zs_parms = &ds_parms;
1702 break;
1703 case MACH_DS5000_XX:
1704 system_base = 0xbc000000;
1705 n_chips = 1;
1706 zs_parms = &ds_parms;
1707 break;
1708 #endif
1709 #ifdef CONFIG_BAGET_MIPS
1710 case MACH_BAGET202:
1711 system_base = UNI_IO_BASE;
1712 n_chips = 2;
1713 zs_parms = &baget_parms;
1714 zs_init_regs[2] = 0x8;
1715 break;
1716 #endif
1717 default:
1718 panic("zs: unsupported bus");
1719 }
1720 if (!zs_parms)
1721 panic("zs: uninitialized parms");
1722
1723 pp = &zs_chain;
1724
1725 n_channels = 0;
1726
1727 for (chip = 0; chip < n_chips; chip++) {
1728 for (channel = 0; channel <= 1; channel++) {
1729 /*
1730 * The sccs reside on the high byte of the 16 bit IOBUS
1731 */
1732 zs_channels[n_channels].control =
1733 (volatile unsigned char *)system_base +
1734 (0 == chip ? zs_parms->scc0 : zs_parms->scc1) +
1735 (0 == channel ? zs_parms->channel_a_offset :
1736 zs_parms->channel_b_offset);
1737 zs_channels[n_channels].data =
1738 zs_channels[n_channels].control + 4;
1739
1740 #ifndef CONFIG_SERIAL_CONSOLE
1741 /*
1742 * We're called early and memory managment isn't up, yet.
1743 * Thus check_region would fail.
1744 */
1745 if (check_region((unsigned long)
1746 zs_channels[n_channels].control,
1747 ZS_CHAN_IO_SIZE) < 0) {
1748 panic("SCC I/O region is not free");
1749 }
1750 request_region((unsigned long)
1751 zs_channels[n_channels].control,
1752 ZS_CHAN_IO_SIZE, "SCC");
1753 #endif
1754 zs_soft[n_channels].zs_channel = &zs_channels[n_channels];
1755 zs_soft[n_channels].irq = zs_parms->irq;
1756
1757 /*
1758 * Identification of channel A. Location of channel A
1759 * inside chip depends on mapping of internal address
1760 * the chip decodes channels by.
1761 * CHANNEL_A_NR returns either 0 (in case of
1762 * DECstations) or 1 (in case of Baget).
1763 */
1764 if (CHANNEL_A_NR == channel)
1765 zs_soft[n_channels].zs_chan_a =
1766 &zs_channels[n_channels+1-2*CHANNEL_A_NR];
1767 else
1768 zs_soft[n_channels].zs_chan_a =
1769 &zs_channels[n_channels];
1770
1771 *pp = &zs_soft[n_channels];
1772 pp = &zs_soft[n_channels].zs_next;
1773 n_channels++;
1774 }
1775 }
1776
1777 *pp = 0;
1778 zs_channels_found = n_channels;
1779
1780 for (n = 0; n < zs_channels_found; n++) {
1781 for (i = 0; i < 16; i++) {
1782 zs_soft[n].zs_channel->curregs[i] = zs_init_regs[i];
1783 }
1784 }
1785
1786 /* save_and_cli(flags);
1787 for (n = 0; n < zs_channels_found; n++) {
1788 if (((int)zs_channels[n].control & 0xf) == 1) {
1789 write_zsreg(zs_soft[n].zs_chan_a, R9, FHWRES);
1790 mdelay(10);
1791 write_zsreg(zs_soft[n].zs_chan_a, R9, 0);
1792 }
1793 load_zsregs(zs_soft[n].zs_channel, zs_soft[n].zs_channel->curregs);
1794 }
1795 restore_flags(flags); */
1796 }
1797
1798 static struct tty_operations serial_ops = {
1799 .open = rs_open,
1800 .close = rs_close,
1801 .write = rs_write,
1802 .flush_chars = rs_flush_chars,
1803 .write_room = rs_write_room,
1804 .chars_in_buffer = rs_chars_in_buffer,
1805 .flush_buffer = rs_flush_buffer,
1806 .ioctl = rs_ioctl,
1807 .throttle = rs_throttle,
1808 .unthrottle = rs_unthrottle,
1809 .set_termios = rs_set_termios,
1810 .stop = rs_stop,
1811 .start = rs_start,
1812 .hangup = rs_hangup,
1813 .break_ctl = rs_break,
1814 .wait_until_sent = rs_wait_until_sent,
1815 .tiocmget = rs_tiocmget,
1816 .tiocmset = rs_tiocmset,
1817 };
1818
1819 /* zs_init inits the driver */
1820 int __init zs_init(void)
1821 {
1822 int channel, i;
1823 unsigned long flags;
1824 struct dec_serial *info;
1825
1826 if(!BUS_PRESENT)
1827 return -ENODEV;
1828
1829 /* Setup base handler, and timer table. */
1830 init_bh(SERIAL_BH, do_serial_bh);
1831
1832 /* Find out how many Z8530 SCCs we have */
1833 if (zs_chain == 0)
1834 probe_sccs();
1835
1836 serial_driver = alloc_tty_driver(zs_channels_found);
1837 if (!serial_driver)
1838 return -ENOMEM;
1839
1840 show_serial_version();
1841
1842 /* Initialize the tty_driver structure */
1843 /* Not all of this is exactly right for us. */
1844
1845 serial_driver->owner = THIS_MODULE;
1846 serial_driver->devfs_name = "tts/";
1847 serial_driver->name = "ttyS";
1848 serial_driver->major = TTY_MAJOR;
1849 serial_driver->minor_start = 64;
1850 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1851 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1852 serial_driver->init_termios = tty_std_termios;
1853 serial_driver->init_termios.c_cflag =
1854 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1855 serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
1856 tty_set_operations(serial_driver, &serial_ops);
1857
1858 if (tty_register_driver(serial_driver))
1859 panic("Couldn't register serial driver\n");
1860
1861 save_flags(flags); cli();
1862
1863 for (channel = 0; channel < zs_channels_found; ++channel) {
1864 if (zs_soft[channel].hook &&
1865 zs_soft[channel].hook->init_channel)
1866 (*zs_soft[channel].hook->init_channel)
1867 (&zs_soft[channel]);
1868
1869 zs_soft[channel].clk_divisor = 16;
1870 zs_soft[channel].zs_baud = get_zsbaud(&zs_soft[channel]);
1871
1872 if (request_irq(zs_parms->irq, rs_interrupt, SA_SHIRQ,
1873 "SCC", &zs_soft[channel]))
1874 printk(KERN_ERR "decserial: can't get irq %d\n",
1875 zs_parms->irq);
1876 }
1877
1878 for (info = zs_chain, i = 0; info; info = info->zs_next, i++)
1879 {
1880 if (info->hook && info->hook->init_info) {
1881 (*info->hook->init_info)(info);
1882 continue;
1883 }
1884 info->magic = SERIAL_MAGIC;
1885 info->port = (int) info->zs_channel->control;
1886 info->line = i;
1887 info->tty = 0;
1888 info->custom_divisor = 16;
1889 info->close_delay = 50;
1890 info->closing_wait = 3000;
1891 info->x_char = 0;
1892 info->event = 0;
1893 info->count = 0;
1894 info->blocked_open = 0;
1895 info->tqueue.routine = do_softint;
1896 info->tqueue.data = info;
1897 init_waitqueue_head(&info->open_wait);
1898 init_waitqueue_head(&info->close_wait);
1899 printk("ttyS%02d at 0x%08x (irq = %d)", info->line,
1900 info->port, info->irq);
1901 printk(" is a Z85C30 SCC\n");
1902 tty_register_device(serial_driver, info->line, NULL);
1903 }
1904
1905 restore_flags(flags);
1906
1907 return 0;
1908 }
1909
1910 /*
1911 * register_serial and unregister_serial allows for serial ports to be
1912 * configured at run-time, to support PCMCIA modems.
1913 */
1914 /* PowerMac: Unused at this time, just here to make things link. */
1915 int register_serial(struct serial_struct *req)
1916 {
1917 return -1;
1918 }
1919
1920 void unregister_serial(int line)
1921 {
1922 return;
1923 }
1924
1925 /*
1926 * polling I/O routines
1927 */
1928 static int
1929 zs_poll_tx_char(struct dec_serial *info, unsigned char ch)
1930 {
1931 struct dec_zschannel *chan = info->zs_channel;
1932 int ret;
1933
1934 if(chan) {
1935 int loops = 10000;
1936 // int nine = read_zsreg(chan, R9);
1937
1938 RECOVERY_DELAY;
1939 // write_zsreg(chan, R9, nine & ~MIE);
1940 wbflush();
1941 RECOVERY_DELAY;
1942
1943 while (!(*(chan->control) & Tx_BUF_EMP) && --loops)
1944 RECOVERY_DELAY;
1945
1946 if (loops) {
1947 ret = 0;
1948 *(chan->data) = ch;
1949 wbflush();
1950 RECOVERY_DELAY;
1951 } else
1952 ret = -EAGAIN;
1953
1954 // write_zsreg(chan, R9, nine);
1955 wbflush();
1956 RECOVERY_DELAY;
1957
1958 return ret;
1959 }
1960
1961 return -ENODEV;
1962 }
1963
1964 static int
1965 zs_poll_rx_char(struct dec_serial *info)
1966 {
1967 struct dec_zschannel *chan = info->zs_channel;
1968 int ret;
1969
1970 if(chan) {
1971 int loops = 10000;
1972
1973 while((read_zsreg(chan, 0) & Rx_CH_AV) == 0)
1974 loops--;
1975
1976 if (loops)
1977 ret = read_zsdata(chan);
1978 else
1979 ret = -EAGAIN;
1980
1981 return ret;
1982 } else
1983 return -ENODEV;
1984 }
1985
1986 unsigned int register_zs_hook(unsigned int channel, struct zs_hook *hook)
1987 {
1988 struct dec_serial *info = &zs_soft[channel];
1989
1990 if (info->hook) {
1991 printk("%s: line %d has already a hook registered\n",
1992 __FUNCTION__, channel);
1993
1994 return 0;
1995 } else {
1996 info->hook = hook;
1997
1998 if (zs_chain == 0)
1999 probe_sccs();
2000
2001 if (!(info->flags & ZILOG_INITIALIZED))
2002 zs_startup(info);
2003
2004 hook->poll_rx_char = zs_poll_rx_char;
2005 hook->poll_tx_char = zs_poll_tx_char;
2006
2007 return 1;
2008 }
2009 }
2010
2011 unsigned int unregister_zs_hook(unsigned int channel)
2012 {
2013 struct dec_serial *info = &zs_soft[channel];
2014
2015 if (info->hook) {
2016 info->hook = NULL;
2017 return 1;
2018 } else {
2019 printk("%s: trying to unregister hook on line %d,"
2020 " but none is registered\n", __FUNCTION__, channel);
2021 return 0;
2022 }
2023 }
2024
2025 /*
2026 * ------------------------------------------------------------
2027 * Serial console driver
2028 * ------------------------------------------------------------
2029 */
2030 #ifdef CONFIG_SERIAL_CONSOLE
2031
2032
2033 /*
2034 * Print a string to the serial port trying not to disturb
2035 * any possible real use of the port...
2036 */
2037 static void serial_console_write(struct console *co, const char *s,
2038 unsigned count)
2039 {
2040 struct dec_serial *info;
2041 int i;
2042
2043 info = zs_soft + co->index;
2044
2045 for (i = 0; i < count; i++, s++) {
2046 if(*s == '\n')
2047 zs_poll_tx_char(info, '\r');
2048 zs_poll_tx_char(info, *s);
2049 }
2050 }
2051
2052 static struct tty_driver *serial_console_device(struct console *c, int *index)
2053 {
2054 *index = c->index;
2055 return serial_driver;
2056 }
2057
2058 /*
2059 * Setup initial baud/bits/parity. We do two things here:
2060 * - construct a cflag setting for the first rs_open()
2061 * - initialize the serial port
2062 * Return non-zero if we didn't find a serial port.
2063 */
2064 static int __init serial_console_setup(struct console *co, char *options)
2065 {
2066 struct dec_serial *info;
2067 int baud = 9600;
2068 int bits = 8;
2069 int parity = 'n';
2070 int cflag = CREAD | HUPCL | CLOCAL;
2071 char *s;
2072 unsigned long flags;
2073
2074 if(!BUS_PRESENT)
2075 return -ENODEV;
2076
2077 info = zs_soft + co->index;
2078
2079 if (zs_chain == 0)
2080 probe_sccs();
2081
2082 info->is_cons = 1;
2083
2084 if (options) {
2085 baud = simple_strtoul(options, NULL, 10);
2086 s = options;
2087 while(*s >= '0' && *s <= '9')
2088 s++;
2089 if (*s)
2090 parity = *s++;
2091 if (*s)
2092 bits = *s - '0';
2093 }
2094
2095 /*
2096 * Now construct a cflag setting.
2097 */
2098 switch(baud) {
2099 case 1200:
2100 cflag |= B1200;
2101 break;
2102 case 2400:
2103 cflag |= B2400;
2104 break;
2105 case 4800:
2106 cflag |= B4800;
2107 break;
2108 case 19200:
2109 cflag |= B19200;
2110 break;
2111 case 38400:
2112 cflag |= B38400;
2113 break;
2114 case 57600:
2115 cflag |= B57600;
2116 break;
2117 case 115200:
2118 cflag |= B115200;
2119 break;
2120 case 9600:
2121 default:
2122 cflag |= B9600;
2123 break;
2124 }
2125 switch(bits) {
2126 case 7:
2127 cflag |= CS7;
2128 break;
2129 default:
2130 case 8:
2131 cflag |= CS8;
2132 break;
2133 }
2134 switch(parity) {
2135 case 'o': case 'O':
2136 cflag |= PARODD;
2137 break;
2138 case 'e': case 'E':
2139 cflag |= PARENB;
2140 break;
2141 }
2142 co->cflag = cflag;
2143 #if 1
2144 save_and_cli(flags);
2145
2146 /*
2147 * Turn on RTS and DTR.
2148 */
2149 zs_rtsdtr(info, RTS | DTR, 1);
2150
2151 /*
2152 * Finally, enable sequencing
2153 */
2154 info->zs_channel->curregs[3] |= (RxENABLE | Rx8);
2155 info->zs_channel->curregs[5] |= (TxENAB | Tx8);
2156 info->zs_channel->curregs[9] |= (VIS);
2157 write_zsreg(info->zs_channel, 3, info->zs_channel->curregs[3]);
2158 write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
2159 write_zsreg(info->zs_channel, 9, info->zs_channel->curregs[9]);
2160
2161 /*
2162 * Clear the interrupt registers.
2163 */
2164 write_zsreg(info->zs_channel, 0, ERR_RES);
2165 write_zsreg(info->zs_channel, 0, RES_H_IUS);
2166
2167 /*
2168 * Set the speed of the serial port
2169 */
2170 change_speed(info);
2171
2172 /* Save the current value of RR0 */
2173 info->read_reg_zero = read_zsreg(info->zs_channel, 0);
2174
2175 zs_soft[co->index].clk_divisor = 16;
2176 zs_soft[co->index].zs_baud = get_zsbaud(&zs_soft[co->index]);
2177
2178 restore_flags(flags);
2179 #endif
2180 return 0;
2181 }
2182
2183 static struct console sercons = {
2184 .name = "ttyS",
2185 .write = serial_console_write,
2186 .device = serial_console_device,
2187 .setup = serial_console_setup,
2188 .flags = CON_PRINTBUFFER,
2189 .index = -1,
2190 };
2191
2192 /*
2193 * Register console.
2194 */
2195 void __init zs_serial_console_init(void)
2196 {
2197 register_console(&sercons);
2198 }
2199 #endif /* ifdef CONFIG_SERIAL_CONSOLE */
2200
2201 #ifdef CONFIG_KGDB
2202 struct dec_zschannel *zs_kgdbchan;
2203 static unsigned char scc_inittab[] = {
2204 9, 0x80, /* reset A side (CHRA) */
2205 13, 0, /* set baud rate divisor */
2206 12, 1,
2207 14, 1, /* baud rate gen enable, src=rtxc (BRENABL) */
2208 11, 0x50, /* clocks = br gen (RCBR | TCBR) */
2209 5, 0x6a, /* tx 8 bits, assert RTS (Tx8 | TxENAB | RTS) */
2210 4, 0x44, /* x16 clock, 1 stop (SB1 | X16CLK)*/
2211 3, 0xc1, /* rx enable, 8 bits (RxENABLE | Rx8)*/
2212 };
2213
2214 /* These are for receiving and sending characters under the kgdb
2215 * source level kernel debugger.
2216 */
2217 void putDebugChar(char kgdb_char)
2218 {
2219 struct dec_zschannel *chan = zs_kgdbchan;
2220 while ((read_zsreg(chan, 0) & Tx_BUF_EMP) == 0)
2221 RECOVERY_DELAY;
2222 write_zsdata(chan, kgdb_char);
2223 }
2224 char getDebugChar(void)
2225 {
2226 struct dec_zschannel *chan = zs_kgdbchan;
2227 while((read_zsreg(chan, 0) & Rx_CH_AV) == 0)
2228 eieio(); /*barrier();*/
2229 return read_zsdata(chan);
2230 }
2231 void kgdb_interruptible(int yes)
2232 {
2233 struct dec_zschannel *chan = zs_kgdbchan;
2234 int one, nine;
2235 nine = read_zsreg(chan, 9);
2236 if (yes == 1) {
2237 one = EXT_INT_ENAB|INT_ALL_Rx;
2238 nine |= MIE;
2239 printk("turning serial ints on\n");
2240 } else {
2241 one = RxINT_DISAB;
2242 nine &= ~MIE;
2243 printk("turning serial ints off\n");
2244 }
2245 write_zsreg(chan, 1, one);
2246 write_zsreg(chan, 9, nine);
2247 }
2248
2249 static int kgdbhook_init_channel(struct dec_serial* info)
2250 {
2251 return 0;
2252 }
2253
2254 static void kgdbhook_init_info(struct dec_serial* info)
2255 {
2256 }
2257
2258 static void kgdbhook_rx_char(struct dec_serial* info,
2259 unsigned char ch, unsigned char stat)
2260 {
2261 if (ch == 0x03 || ch == '$')
2262 breakpoint();
2263 if (stat & (Rx_OVR|FRM_ERR|PAR_ERR))
2264 write_zsreg(info->zs_channel, 0, ERR_RES);
2265 }
2266
2267 /* This sets up the serial port we're using, and turns on
2268 * interrupts for that channel, so kgdb is usable once we're done.
2269 */
2270 static inline void kgdb_chaninit(struct dec_zschannel *ms, int intson, int bps)
2271 {
2272 int brg;
2273 int i, x;
2274 volatile char *sccc = ms->control;
2275 brg = BPS_TO_BRG(bps, zs_parms->clock/16);
2276 printk("setting bps on kgdb line to %d [brg=%x]\n", bps, brg);
2277 for (i = 20000; i != 0; --i) {
2278 x = *sccc; eieio();
2279 }
2280 for (i = 0; i < sizeof(scc_inittab); ++i) {
2281 write_zsreg(ms, scc_inittab[i], scc_inittab[i+1]);
2282 i++;
2283 }
2284 }
2285 /* This is called at boot time to prime the kgdb serial debugging
2286 * serial line. The 'tty_num' argument is 0 for /dev/ttya and 1
2287 * for /dev/ttyb which is determined in setup_arch() from the
2288 * boot command line flags.
2289 */
2290 struct zs_hook zs_kgdbhook = {
2291 init_channel : kgdbhook_init_channel,
2292 init_info : kgdbhook_init_info,
2293 cflags : B38400|CS8|CLOCAL,
2294 rx_char : kgdbhook_rx_char,
2295 }
2296
2297 void __init zs_kgdb_hook(int tty_num)
2298 {
2299 /* Find out how many Z8530 SCCs we have */
2300 if (zs_chain == 0)
2301 probe_sccs();
2302 zs_soft[tty_num].zs_channel = &zs_channels[tty_num];
2303 zs_kgdbchan = zs_soft[tty_num].zs_channel;
2304 zs_soft[tty_num].change_needed = 0;
2305 zs_soft[tty_num].clk_divisor = 16;
2306 zs_soft[tty_num].zs_baud = 38400;
2307 zs_soft[tty_num].hook = &zs_kgdbhook; /* This runs kgdb */
2308 /* Turn on transmitter/receiver at 8-bits/char */
2309 kgdb_chaninit(zs_soft[tty_num].zs_channel, 1, 38400);
2310 printk("KGDB: on channel %d initialized\n", tty_num);
2311 set_debug_traps(); /* init stub */
2312 }
2313 #endif /* ifdef CONFIG_KGDB */
2314
2315
Historical 2.5/2.6 development