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[PATCH] UFS: inode->i_sem is not released in error path
[linux-2.6/verdex.git] / drivers / serial / mcfserial.c
blob47f7404cb04542a80408254685b3d57451eaea06
1 /*
2 * mcfserial.c -- serial driver for ColdFire internal UARTS.
3 *
4 * Copyright (C) 1999-2003 Greg Ungerer <gerg@snapgear.com>
5 * Copyright (c) 2000-2001 Lineo, Inc. <www.lineo.com>
6 * Copyright (C) 2001-2002 SnapGear Inc. <www.snapgear.com>
7 *
8 * Based on code from 68332serial.c which was:
9 *
10 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
11 * Copyright (C) 1998 TSHG
12 * Copyright (c) 1999 Rt-Control Inc. <jeff@uclinux.org>
13 *
14 * Changes:
15 * 08/07/2003 Daniele Bellucci <bellucda@tiscali.it>
16 * some cleanups in mcfrs_write.
17 *
18 */
19
20 #include <linux/module.h>
21 #include <linux/errno.h>
22 #include <linux/signal.h>
23 #include <linux/sched.h>
24 #include <linux/timer.h>
25 #include <linux/wait.h>
26 #include <linux/interrupt.h>
27 #include <linux/tty.h>
28 #include <linux/tty_flip.h>
29 #include <linux/string.h>
30 #include <linux/fcntl.h>
31 #include <linux/mm.h>
32 #include <linux/kernel.h>
33 #include <linux/serial.h>
34 #include <linux/serialP.h>
35 #include <linux/console.h>
36 #include <linux/init.h>
37 #include <linux/bitops.h>
38 #include <linux/delay.h>
39
40 #include <asm/io.h>
41 #include <asm/irq.h>
42 #include <asm/system.h>
43 #include <asm/semaphore.h>
44 #include <asm/delay.h>
45 #include <asm/coldfire.h>
46 #include <asm/mcfsim.h>
47 #include <asm/mcfuart.h>
48 #include <asm/nettel.h>
49 #include <asm/uaccess.h>
50 #include "mcfserial.h"
51
52 struct timer_list mcfrs_timer_struct;
53
54 /*
55 * Default console baud rate, we use this as the default
56 * for all ports so init can just open /dev/console and
57 * keep going. Perhaps one day the cflag settings for the
58 * console can be used instead.
59 */
60 #if defined(CONFIG_ARNEWSH) || defined(CONFIG_FREESCALE) || \
61 defined(CONFIG_senTec) || defined(CONFIG_SNEHA)
62 #define CONSOLE_BAUD_RATE 19200
63 #define DEFAULT_CBAUD B19200
64 #endif
65
66 #if defined(CONFIG_HW_FEITH)
67 #define CONSOLE_BAUD_RATE 38400
68 #define DEFAULT_CBAUD B38400
69 #endif
70
71 #if defined(CONFIG_MOD5272) || defined(CONFIG_M5208EVB)
72 #define CONSOLE_BAUD_RATE 115200
73 #define DEFAULT_CBAUD B115200
74 #endif
75
76 #ifndef CONSOLE_BAUD_RATE
77 #define CONSOLE_BAUD_RATE 9600
78 #define DEFAULT_CBAUD B9600
79 #endif
80
81 int mcfrs_console_inited = 0;
82 int mcfrs_console_port = -1;
83 int mcfrs_console_baud = CONSOLE_BAUD_RATE;
84 int mcfrs_console_cbaud = DEFAULT_CBAUD;
85
86 /*
87 * Driver data structures.
88 */
89 static struct tty_driver *mcfrs_serial_driver;
90
91 /* number of characters left in xmit buffer before we ask for more */
92 #define WAKEUP_CHARS 256
93
94 /* Debugging...
95 */
96 #undef SERIAL_DEBUG_OPEN
97 #undef SERIAL_DEBUG_FLOW
98
99 #if defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x) || \
100 defined(CONFIG_M520x)
101 #define IRQBASE (MCFINT_VECBASE+MCFINT_UART0)
102 #else
103 #define IRQBASE 73
104 #endif
105
106 /*
107 * Configuration table, UARTs to look for at startup.
108 */
109 static struct mcf_serial mcfrs_table[] = {
110 { /* ttyS0 */
111 .magic = 0,
112 .addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE1),
113 .irq = IRQBASE,
114 .flags = ASYNC_BOOT_AUTOCONF,
115 },
116 { /* ttyS1 */
117 .magic = 0,
118 .addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE2),
119 .irq = IRQBASE+1,
120 .flags = ASYNC_BOOT_AUTOCONF,
121 },
122 };
123
124
125 #define NR_PORTS (sizeof(mcfrs_table) / sizeof(struct mcf_serial))
126
127 /*
128 * This is used to figure out the divisor speeds and the timeouts.
129 */
130 static int mcfrs_baud_table[] = {
131 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
132 9600, 19200, 38400, 57600, 115200, 230400, 460800, 0
133 };
134 #define MCFRS_BAUD_TABLE_SIZE \
135 (sizeof(mcfrs_baud_table)/sizeof(mcfrs_baud_table[0]))
136
137
138 #ifdef CONFIG_MAGIC_SYSRQ
139 /*
140 * Magic system request keys. Used for debugging...
141 */
142 extern int magic_sysrq_key(int ch);
143 #endif
144
145
146 /*
147 * Forware declarations...
148 */
149 static void mcfrs_change_speed(struct mcf_serial *info);
150 static void mcfrs_wait_until_sent(struct tty_struct *tty, int timeout);
151
152
153 static inline int serial_paranoia_check(struct mcf_serial *info,
154 char *name, const char *routine)
155 {
156 #ifdef SERIAL_PARANOIA_CHECK
157 static const char badmagic[] =
158 "MCFRS(warning): bad magic number for serial struct %s in %s\n";
159 static const char badinfo[] =
160 "MCFRS(warning): null mcf_serial for %s in %s\n";
161
162 if (!info) {
163 printk(badinfo, name, routine);
164 return 1;
165 }
166 if (info->magic != SERIAL_MAGIC) {
167 printk(badmagic, name, routine);
168 return 1;
169 }
170 #endif
171 return 0;
172 }
173
174 /*
175 * Sets or clears DTR and RTS on the requested line.
176 */
177 static void mcfrs_setsignals(struct mcf_serial *info, int dtr, int rts)
178 {
179 volatile unsigned char *uartp;
180 unsigned long flags;
181
182 #if 0
183 printk("%s(%d): mcfrs_setsignals(info=%x,dtr=%d,rts=%d)\n",
184 __FILE__, __LINE__, info, dtr, rts);
185 #endif
186
187 local_irq_save(flags);
188 if (dtr >= 0) {
189 #ifdef MCFPP_DTR0
190 if (info->line)
191 mcf_setppdata(MCFPP_DTR1, (dtr ? 0 : MCFPP_DTR1));
192 else
193 mcf_setppdata(MCFPP_DTR0, (dtr ? 0 : MCFPP_DTR0));
194 #endif
195 }
196 if (rts >= 0) {
197 uartp = info->addr;
198 if (rts) {
199 info->sigs |= TIOCM_RTS;
200 uartp[MCFUART_UOP1] = MCFUART_UOP_RTS;
201 } else {
202 info->sigs &= ~TIOCM_RTS;
203 uartp[MCFUART_UOP0] = MCFUART_UOP_RTS;
204 }
205 }
206 local_irq_restore(flags);
207 return;
208 }
209
210 /*
211 * Gets values of serial signals.
212 */
213 static int mcfrs_getsignals(struct mcf_serial *info)
214 {
215 volatile unsigned char *uartp;
216 unsigned long flags;
217 int sigs;
218 #if defined(CONFIG_NETtel) && defined(CONFIG_M5307)
219 unsigned short ppdata;
220 #endif
221
222 #if 0
223 printk("%s(%d): mcfrs_getsignals(info=%x)\n", __FILE__, __LINE__);
224 #endif
225
226 local_irq_save(flags);
227 uartp = info->addr;
228 sigs = (uartp[MCFUART_UIPR] & MCFUART_UIPR_CTS) ? 0 : TIOCM_CTS;
229 sigs |= (info->sigs & TIOCM_RTS);
230
231 #ifdef MCFPP_DCD0
232 {
233 unsigned int ppdata;
234 ppdata = mcf_getppdata();
235 if (info->line == 0) {
236 sigs |= (ppdata & MCFPP_DCD0) ? 0 : TIOCM_CD;
237 sigs |= (ppdata & MCFPP_DTR0) ? 0 : TIOCM_DTR;
238 } else if (info->line == 1) {
239 sigs |= (ppdata & MCFPP_DCD1) ? 0 : TIOCM_CD;
240 sigs |= (ppdata & MCFPP_DTR1) ? 0 : TIOCM_DTR;
241 }
242 }
243 #endif
244
245 local_irq_restore(flags);
246 return(sigs);
247 }
248
249 /*
250 * ------------------------------------------------------------
251 * mcfrs_stop() and mcfrs_start()
252 *
253 * This routines are called before setting or resetting tty->stopped.
254 * They enable or disable transmitter interrupts, as necessary.
255 * ------------------------------------------------------------
256 */
257 static void mcfrs_stop(struct tty_struct *tty)
258 {
259 volatile unsigned char *uartp;
260 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
261 unsigned long flags;
262
263 if (serial_paranoia_check(info, tty->name, "mcfrs_stop"))
264 return;
265
266 local_irq_save(flags);
267 uartp = info->addr;
268 info->imr &= ~MCFUART_UIR_TXREADY;
269 uartp[MCFUART_UIMR] = info->imr;
270 local_irq_restore(flags);
271 }
272
273 static void mcfrs_start(struct tty_struct *tty)
274 {
275 volatile unsigned char *uartp;
276 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
277 unsigned long flags;
278
279 if (serial_paranoia_check(info, tty->name, "mcfrs_start"))
280 return;
281
282 local_irq_save(flags);
283 if (info->xmit_cnt && info->xmit_buf) {
284 uartp = info->addr;
285 info->imr |= MCFUART_UIR_TXREADY;
286 uartp[MCFUART_UIMR] = info->imr;
287 }
288 local_irq_restore(flags);
289 }
290
291 /*
292 * ----------------------------------------------------------------------
293 *
294 * Here starts the interrupt handling routines. All of the following
295 * subroutines are declared as inline and are folded into
296 * mcfrs_interrupt(). They were separated out for readability's sake.
297 *
298 * Note: mcfrs_interrupt() is a "fast" interrupt, which means that it
299 * runs with interrupts turned off. People who may want to modify
300 * mcfrs_interrupt() should try to keep the interrupt handler as fast as
301 * possible. After you are done making modifications, it is not a bad
302 * idea to do:
303 *
304 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
305 *
306 * and look at the resulting assemble code in serial.s.
307 *
308 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
309 * -----------------------------------------------------------------------
310 */
311
312 static inline void receive_chars(struct mcf_serial *info)
313 {
314 volatile unsigned char *uartp;
315 struct tty_struct *tty = info->tty;
316 unsigned char status, ch;
317
318 if (!tty)
319 return;
320
321 uartp = info->addr;
322
323 while ((status = uartp[MCFUART_USR]) & MCFUART_USR_RXREADY) {
324
325 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
326 break;
327
328 ch = uartp[MCFUART_URB];
329 info->stats.rx++;
330
331 #ifdef CONFIG_MAGIC_SYSRQ
332 if (mcfrs_console_inited && (info->line == mcfrs_console_port)) {
333 if (magic_sysrq_key(ch))
334 continue;
335 }
336 #endif
337
338 tty->flip.count++;
339 if (status & MCFUART_USR_RXERR) {
340 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETERR;
341 if (status & MCFUART_USR_RXBREAK) {
342 info->stats.rxbreak++;
343 *tty->flip.flag_buf_ptr++ = TTY_BREAK;
344 } else if (status & MCFUART_USR_RXPARITY) {
345 info->stats.rxparity++;
346 *tty->flip.flag_buf_ptr++ = TTY_PARITY;
347 } else if (status & MCFUART_USR_RXOVERRUN) {
348 info->stats.rxoverrun++;
349 *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
350 } else if (status & MCFUART_USR_RXFRAMING) {
351 info->stats.rxframing++;
352 *tty->flip.flag_buf_ptr++ = TTY_FRAME;
353 } else {
354 /* This should never happen... */
355 *tty->flip.flag_buf_ptr++ = 0;
356 }
357 } else {
358 *tty->flip.flag_buf_ptr++ = 0;
359 }
360 *tty->flip.char_buf_ptr++ = ch;
361 }
362
363 schedule_work(&tty->flip.work);
364 return;
365 }
366
367 static inline void transmit_chars(struct mcf_serial *info)
368 {
369 volatile unsigned char *uartp;
370
371 uartp = info->addr;
372
373 if (info->x_char) {
374 /* Send special char - probably flow control */
375 uartp[MCFUART_UTB] = info->x_char;
376 info->x_char = 0;
377 info->stats.tx++;
378 }
379
380 if ((info->xmit_cnt <= 0) || info->tty->stopped) {
381 info->imr &= ~MCFUART_UIR_TXREADY;
382 uartp[MCFUART_UIMR] = info->imr;
383 return;
384 }
385
386 while (uartp[MCFUART_USR] & MCFUART_USR_TXREADY) {
387 uartp[MCFUART_UTB] = info->xmit_buf[info->xmit_tail++];
388 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
389 info->stats.tx++;
390 if (--info->xmit_cnt <= 0)
391 break;
392 }
393
394 if (info->xmit_cnt < WAKEUP_CHARS)
395 schedule_work(&info->tqueue);
396 return;
397 }
398
399 /*
400 * This is the serial driver's generic interrupt routine
401 */
402 irqreturn_t mcfrs_interrupt(int irq, void *dev_id, struct pt_regs *regs)
403 {
404 struct mcf_serial *info;
405 unsigned char isr;
406
407 info = &mcfrs_table[(irq - IRQBASE)];
408 isr = info->addr[MCFUART_UISR] & info->imr;
409
410 if (isr & MCFUART_UIR_RXREADY)
411 receive_chars(info);
412 if (isr & MCFUART_UIR_TXREADY)
413 transmit_chars(info);
414 return IRQ_HANDLED;
415 }
416
417 /*
418 * -------------------------------------------------------------------
419 * Here ends the serial interrupt routines.
420 * -------------------------------------------------------------------
421 */
422
423 static void mcfrs_offintr(void *private)
424 {
425 struct mcf_serial *info = (struct mcf_serial *) private;
426 struct tty_struct *tty;
427
428 tty = info->tty;
429 if (!tty)
430 return;
431 tty_wakeup(tty);
432 }
433
434
435 /*
436 * Change of state on a DCD line.
437 */
438 void mcfrs_modem_change(struct mcf_serial *info, int dcd)
439 {
440 if (info->count == 0)
441 return;
442
443 if (info->flags & ASYNC_CHECK_CD) {
444 if (dcd)
445 wake_up_interruptible(&info->open_wait);
446 else
447 schedule_work(&info->tqueue_hangup);
448 }
449 }
450
451
452 #ifdef MCFPP_DCD0
453
454 unsigned short mcfrs_ppstatus;
455
456 /*
457 * This subroutine is called when the RS_TIMER goes off. It is used
458 * to monitor the state of the DCD lines - since they have no edge
459 * sensors and interrupt generators.
460 */
461 static void mcfrs_timer(void)
462 {
463 unsigned int ppstatus, dcdval, i;
464
465 ppstatus = mcf_getppdata() & (MCFPP_DCD0 | MCFPP_DCD1);
466
467 if (ppstatus != mcfrs_ppstatus) {
468 for (i = 0; (i < 2); i++) {
469 dcdval = (i ? MCFPP_DCD1 : MCFPP_DCD0);
470 if ((ppstatus & dcdval) != (mcfrs_ppstatus & dcdval)) {
471 mcfrs_modem_change(&mcfrs_table[i],
472 ((ppstatus & dcdval) ? 0 : 1));
473 }
474 }
475 }
476 mcfrs_ppstatus = ppstatus;
477
478 /* Re-arm timer */
479 mcfrs_timer_struct.expires = jiffies + HZ/25;
480 add_timer(&mcfrs_timer_struct);
481 }
482
483 #endif /* MCFPP_DCD0 */
484
485
486 /*
487 * This routine is called from the scheduler tqueue when the interrupt
488 * routine has signalled that a hangup has occurred. The path of
489 * hangup processing is:
490 *
491 * serial interrupt routine -> (scheduler tqueue) ->
492 * do_serial_hangup() -> tty->hangup() -> mcfrs_hangup()
493 *
494 */
495 static void do_serial_hangup(void *private)
496 {
497 struct mcf_serial *info = (struct mcf_serial *) private;
498 struct tty_struct *tty;
499
500 tty = info->tty;
501 if (!tty)
502 return;
503
504 tty_hangup(tty);
505 }
506
507 static int startup(struct mcf_serial * info)
508 {
509 volatile unsigned char *uartp;
510 unsigned long flags;
511
512 if (info->flags & ASYNC_INITIALIZED)
513 return 0;
514
515 if (!info->xmit_buf) {
516 info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
517 if (!info->xmit_buf)
518 return -ENOMEM;
519 }
520
521 local_irq_save(flags);
522
523 #ifdef SERIAL_DEBUG_OPEN
524 printk("starting up ttyS%d (irq %d)...\n", info->line, info->irq);
525 #endif
526
527 /*
528 * Reset UART, get it into known state...
529 */
530 uartp = info->addr;
531 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
532 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
533 mcfrs_setsignals(info, 1, 1);
534
535 if (info->tty)
536 clear_bit(TTY_IO_ERROR, &info->tty->flags);
537 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
538
539 /*
540 * and set the speed of the serial port
541 */
542 mcfrs_change_speed(info);
543
544 /*
545 * Lastly enable the UART transmitter and receiver, and
546 * interrupt enables.
547 */
548 info->imr = MCFUART_UIR_RXREADY;
549 uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
550 uartp[MCFUART_UIMR] = info->imr;
551
552 info->flags |= ASYNC_INITIALIZED;
553 local_irq_restore(flags);
554 return 0;
555 }
556
557 /*
558 * This routine will shutdown a serial port; interrupts are disabled, and
559 * DTR is dropped if the hangup on close termio flag is on.
560 */
561 static void shutdown(struct mcf_serial * info)
562 {
563 volatile unsigned char *uartp;
564 unsigned long flags;
565
566 if (!(info->flags & ASYNC_INITIALIZED))
567 return;
568
569 #ifdef SERIAL_DEBUG_OPEN
570 printk("Shutting down serial port %d (irq %d)....\n", info->line,
571 info->irq);
572 #endif
573
574 local_irq_save(flags);
575
576 uartp = info->addr;
577 uartp[MCFUART_UIMR] = 0; /* mask all interrupts */
578 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
579 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
580
581 if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
582 mcfrs_setsignals(info, 0, 0);
583
584 if (info->xmit_buf) {
585 free_page((unsigned long) info->xmit_buf);
586 info->xmit_buf = 0;
587 }
588
589 if (info->tty)
590 set_bit(TTY_IO_ERROR, &info->tty->flags);
591
592 info->flags &= ~ASYNC_INITIALIZED;
593 local_irq_restore(flags);
594 }
595
596
597 /*
598 * This routine is called to set the UART divisor registers to match
599 * the specified baud rate for a serial port.
600 */
601 static void mcfrs_change_speed(struct mcf_serial *info)
602 {
603 volatile unsigned char *uartp;
604 unsigned int baudclk, cflag;
605 unsigned long flags;
606 unsigned char mr1, mr2;
607 int i;
608 #ifdef CONFIG_M5272
609 unsigned int fraction;
610 #endif
611
612 if (!info->tty || !info->tty->termios)
613 return;
614 cflag = info->tty->termios->c_cflag;
615 if (info->addr == 0)
616 return;
617
618 #if 0
619 printk("%s(%d): mcfrs_change_speed()\n", __FILE__, __LINE__);
620 #endif
621
622 i = cflag & CBAUD;
623 if (i & CBAUDEX) {
624 i &= ~CBAUDEX;
625 if (i < 1 || i > 4)
626 info->tty->termios->c_cflag &= ~CBAUDEX;
627 else
628 i += 15;
629 }
630 if (i == 0) {
631 mcfrs_setsignals(info, 0, -1);
632 return;
633 }
634
635 /* compute the baudrate clock */
636 #ifdef CONFIG_M5272
637 /*
638 * For the MCF5272, also compute the baudrate fraction.
639 */
640 baudclk = (MCF_BUSCLK / mcfrs_baud_table[i]) / 32;
641 fraction = MCF_BUSCLK - (baudclk * 32 * mcfrs_baud_table[i]);
642 fraction *= 16;
643 fraction /= (32 * mcfrs_baud_table[i]);
644 #else
645 baudclk = ((MCF_BUSCLK / mcfrs_baud_table[i]) + 16) / 32;
646 #endif
647
648 info->baud = mcfrs_baud_table[i];
649
650 mr1 = MCFUART_MR1_RXIRQRDY | MCFUART_MR1_RXERRCHAR;
651 mr2 = 0;
652
653 switch (cflag & CSIZE) {
654 case CS5: mr1 |= MCFUART_MR1_CS5; break;
655 case CS6: mr1 |= MCFUART_MR1_CS6; break;
656 case CS7: mr1 |= MCFUART_MR1_CS7; break;
657 case CS8:
658 default: mr1 |= MCFUART_MR1_CS8; break;
659 }
660
661 if (cflag & PARENB) {
662 if (cflag & CMSPAR) {
663 if (cflag & PARODD)
664 mr1 |= MCFUART_MR1_PARITYMARK;
665 else
666 mr1 |= MCFUART_MR1_PARITYSPACE;
667 } else {
668 if (cflag & PARODD)
669 mr1 |= MCFUART_MR1_PARITYODD;
670 else
671 mr1 |= MCFUART_MR1_PARITYEVEN;
672 }
673 } else {
674 mr1 |= MCFUART_MR1_PARITYNONE;
675 }
676
677 if (cflag & CSTOPB)
678 mr2 |= MCFUART_MR2_STOP2;
679 else
680 mr2 |= MCFUART_MR2_STOP1;
681
682 if (cflag & CRTSCTS) {
683 mr1 |= MCFUART_MR1_RXRTS;
684 mr2 |= MCFUART_MR2_TXCTS;
685 }
686
687 if (cflag & CLOCAL)
688 info->flags &= ~ASYNC_CHECK_CD;
689 else
690 info->flags |= ASYNC_CHECK_CD;
691
692 uartp = info->addr;
693
694 local_irq_save(flags);
695 #if 0
696 printk("%s(%d): mr1=%x mr2=%x baudclk=%x\n", __FILE__, __LINE__,
697 mr1, mr2, baudclk);
698 #endif
699 /*
700 Note: pg 12-16 of MCF5206e User's Manual states that a
701 software reset should be performed prior to changing
702 UMR1,2, UCSR, UACR, bit 7
703 */
704 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
705 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
706 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETMRPTR; /* reset MR pointer */
707 uartp[MCFUART_UMR] = mr1;
708 uartp[MCFUART_UMR] = mr2;
709 uartp[MCFUART_UBG1] = (baudclk & 0xff00) >> 8; /* set msb byte */
710 uartp[MCFUART_UBG2] = (baudclk & 0xff); /* set lsb byte */
711 #ifdef CONFIG_M5272
712 uartp[MCFUART_UFPD] = (fraction & 0xf); /* set fraction */
713 #endif
714 uartp[MCFUART_UCSR] = MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER;
715 uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
716 mcfrs_setsignals(info, 1, -1);
717 local_irq_restore(flags);
718 return;
719 }
720
721 static void mcfrs_flush_chars(struct tty_struct *tty)
722 {
723 volatile unsigned char *uartp;
724 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
725 unsigned long flags;
726
727 if (serial_paranoia_check(info, tty->name, "mcfrs_flush_chars"))
728 return;
729
730 uartp = (volatile unsigned char *) info->addr;
731
732 /*
733 * re-enable receiver interrupt
734 */
735 local_irq_save(flags);
736 if ((!(info->imr & MCFUART_UIR_RXREADY)) &&
737 (info->flags & ASYNC_INITIALIZED) ) {
738 info->imr |= MCFUART_UIR_RXREADY;
739 uartp[MCFUART_UIMR] = info->imr;
740 }
741 local_irq_restore(flags);
742
743 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
744 !info->xmit_buf)
745 return;
746
747 /* Enable transmitter */
748 local_irq_save(flags);
749 info->imr |= MCFUART_UIR_TXREADY;
750 uartp[MCFUART_UIMR] = info->imr;
751 local_irq_restore(flags);
752 }
753
754 static int mcfrs_write(struct tty_struct * tty,
755 const unsigned char *buf, int count)
756 {
757 volatile unsigned char *uartp;
758 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
759 unsigned long flags;
760 int c, total = 0;
761
762 #if 0
763 printk("%s(%d): mcfrs_write(tty=%x,buf=%x,count=%d)\n",
764 __FILE__, __LINE__, (int)tty, (int)buf, count);
765 #endif
766
767 if (serial_paranoia_check(info, tty->name, "mcfrs_write"))
768 return 0;
769
770 if (!tty || !info->xmit_buf)
771 return 0;
772
773 local_save_flags(flags);
774 while (1) {
775 local_irq_disable();
776 c = min(count, (int) min(((int)SERIAL_XMIT_SIZE) - info->xmit_cnt - 1,
777 ((int)SERIAL_XMIT_SIZE) - info->xmit_head));
778 local_irq_restore(flags);
779
780 if (c <= 0)
781 break;
782
783 memcpy(info->xmit_buf + info->xmit_head, buf, c);
784
785 local_irq_disable();
786 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
787 info->xmit_cnt += c;
788 local_irq_restore(flags);
789
790 buf += c;
791 count -= c;
792 total += c;
793 }
794
795 local_irq_disable();
796 uartp = info->addr;
797 info->imr |= MCFUART_UIR_TXREADY;
798 uartp[MCFUART_UIMR] = info->imr;
799 local_irq_restore(flags);
800
801 return total;
802 }
803
804 static int mcfrs_write_room(struct tty_struct *tty)
805 {
806 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
807 int ret;
808
809 if (serial_paranoia_check(info, tty->name, "mcfrs_write_room"))
810 return 0;
811 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
812 if (ret < 0)
813 ret = 0;
814 return ret;
815 }
816
817 static int mcfrs_chars_in_buffer(struct tty_struct *tty)
818 {
819 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
820
821 if (serial_paranoia_check(info, tty->name, "mcfrs_chars_in_buffer"))
822 return 0;
823 return info->xmit_cnt;
824 }
825
826 static void mcfrs_flush_buffer(struct tty_struct *tty)
827 {
828 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
829 unsigned long flags;
830
831 if (serial_paranoia_check(info, tty->name, "mcfrs_flush_buffer"))
832 return;
833
834 local_irq_save(flags);
835 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
836 local_irq_restore(flags);
837
838 tty_wakeup(tty);
839 }
840
841 /*
842 * ------------------------------------------------------------
843 * mcfrs_throttle()
844 *
845 * This routine is called by the upper-layer tty layer to signal that
846 * incoming characters should be throttled.
847 * ------------------------------------------------------------
848 */
849 static void mcfrs_throttle(struct tty_struct * tty)
850 {
851 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
852 #ifdef SERIAL_DEBUG_THROTTLE
853 char buf[64];
854
855 printk("throttle %s: %d....\n", _tty_name(tty, buf),
856 tty->ldisc.chars_in_buffer(tty));
857 #endif
858
859 if (serial_paranoia_check(info, tty->name, "mcfrs_throttle"))
860 return;
861
862 if (I_IXOFF(tty))
863 info->x_char = STOP_CHAR(tty);
864
865 /* Turn off RTS line (do this atomic) */
866 }
867
868 static void mcfrs_unthrottle(struct tty_struct * tty)
869 {
870 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
871 #ifdef SERIAL_DEBUG_THROTTLE
872 char buf[64];
873
874 printk("unthrottle %s: %d....\n", _tty_name(tty, buf),
875 tty->ldisc.chars_in_buffer(tty));
876 #endif
877
878 if (serial_paranoia_check(info, tty->name, "mcfrs_unthrottle"))
879 return;
880
881 if (I_IXOFF(tty)) {
882 if (info->x_char)
883 info->x_char = 0;
884 else
885 info->x_char = START_CHAR(tty);
886 }
887
888 /* Assert RTS line (do this atomic) */
889 }
890
891 /*
892 * ------------------------------------------------------------
893 * mcfrs_ioctl() and friends
894 * ------------------------------------------------------------
895 */
896
897 static int get_serial_info(struct mcf_serial * info,
898 struct serial_struct * retinfo)
899 {
900 struct serial_struct tmp;
901
902 if (!retinfo)
903 return -EFAULT;
904 memset(&tmp, 0, sizeof(tmp));
905 tmp.type = info->type;
906 tmp.line = info->line;
907 tmp.port = (unsigned int) info->addr;
908 tmp.irq = info->irq;
909 tmp.flags = info->flags;
910 tmp.baud_base = info->baud_base;
911 tmp.close_delay = info->close_delay;
912 tmp.closing_wait = info->closing_wait;
913 tmp.custom_divisor = info->custom_divisor;
914 return copy_to_user(retinfo,&tmp,sizeof(*retinfo)) ? -EFAULT : 0;
915 }
916
917 static int set_serial_info(struct mcf_serial * info,
918 struct serial_struct * new_info)
919 {
920 struct serial_struct new_serial;
921 struct mcf_serial old_info;
922 int retval = 0;
923
924 if (!new_info)
925 return -EFAULT;
926 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
927 return -EFAULT;
928 old_info = *info;
929
930 if (!capable(CAP_SYS_ADMIN)) {
931 if ((new_serial.baud_base != info->baud_base) ||
932 (new_serial.type != info->type) ||
933 (new_serial.close_delay != info->close_delay) ||
934 ((new_serial.flags & ~ASYNC_USR_MASK) !=
935 (info->flags & ~ASYNC_USR_MASK)))
936 return -EPERM;
937 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
938 (new_serial.flags & ASYNC_USR_MASK));
939 info->custom_divisor = new_serial.custom_divisor;
940 goto check_and_exit;
941 }
942
943 if (info->count > 1)
944 return -EBUSY;
945
946 /*
947 * OK, past this point, all the error checking has been done.
948 * At this point, we start making changes.....
949 */
950
951 info->baud_base = new_serial.baud_base;
952 info->flags = ((info->flags & ~ASYNC_FLAGS) |
953 (new_serial.flags & ASYNC_FLAGS));
954 info->type = new_serial.type;
955 info->close_delay = new_serial.close_delay;
956 info->closing_wait = new_serial.closing_wait;
957
958 check_and_exit:
959 retval = startup(info);
960 return retval;
961 }
962
963 /*
964 * get_lsr_info - get line status register info
965 *
966 * Purpose: Let user call ioctl() to get info when the UART physically
967 * is emptied. On bus types like RS485, the transmitter must
968 * release the bus after transmitting. This must be done when
969 * the transmit shift register is empty, not be done when the
970 * transmit holding register is empty. This functionality
971 * allows an RS485 driver to be written in user space.
972 */
973 static int get_lsr_info(struct mcf_serial * info, unsigned int *value)
974 {
975 volatile unsigned char *uartp;
976 unsigned long flags;
977 unsigned char status;
978
979 local_irq_save(flags);
980 uartp = info->addr;
981 status = (uartp[MCFUART_USR] & MCFUART_USR_TXEMPTY) ? TIOCSER_TEMT : 0;
982 local_irq_restore(flags);
983
984 return put_user(status,value);
985 }
986
987 /*
988 * This routine sends a break character out the serial port.
989 */
990 static void send_break( struct mcf_serial * info, int duration)
991 {
992 volatile unsigned char *uartp;
993 unsigned long flags;
994
995 if (!info->addr)
996 return;
997 set_current_state(TASK_INTERRUPTIBLE);
998 uartp = info->addr;
999
1000 local_irq_save(flags);
1001 uartp[MCFUART_UCR] = MCFUART_UCR_CMDBREAKSTART;
1002 schedule_timeout(duration);
1003 uartp[MCFUART_UCR] = MCFUART_UCR_CMDBREAKSTOP;
1004 local_irq_restore(flags);
1005 }
1006
1007 static int mcfrs_tiocmget(struct tty_struct *tty, struct file *file)
1008 {
1009 struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
1010
1011 if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl"))
1012 return -ENODEV;
1013 if (tty->flags & (1 << TTY_IO_ERROR))
1014 return -EIO;
1015
1016 return mcfrs_getsignals(info);
1017 }
1018
1019 static int mcfrs_tiocmset(struct tty_struct *tty, struct file *file,
1020 unsigned int set, unsigned int clear)
1021 {
1022 struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
1023 int rts = -1, dtr = -1;
1024
1025 if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl"))
1026 return -ENODEV;
1027 if (tty->flags & (1 << TTY_IO_ERROR))
1028 return -EIO;
1029
1030 if (set & TIOCM_RTS)
1031 rts = 1;
1032 if (set & TIOCM_DTR)
1033 dtr = 1;
1034 if (clear & TIOCM_RTS)
1035 rts = 0;
1036 if (clear & TIOCM_DTR)
1037 dtr = 0;
1038
1039 mcfrs_setsignals(info, dtr, rts);
1040
1041 return 0;
1042 }
1043
1044 static int mcfrs_ioctl(struct tty_struct *tty, struct file * file,
1045 unsigned int cmd, unsigned long arg)
1046 {
1047 struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
1048 int retval, error;
1049
1050 if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl"))
1051 return -ENODEV;
1052
1053 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1054 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
1055 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
1056 if (tty->flags & (1 << TTY_IO_ERROR))
1057 return -EIO;
1058 }
1059
1060 switch (cmd) {
1061 case TCSBRK: /* SVID version: non-zero arg --> no break */
1062 retval = tty_check_change(tty);
1063 if (retval)
1064 return retval;
1065 tty_wait_until_sent(tty, 0);
1066 if (!arg)
1067 send_break(info, HZ/4); /* 1/4 second */
1068 return 0;
1069 case TCSBRKP: /* support for POSIX tcsendbreak() */
1070 retval = tty_check_change(tty);
1071 if (retval)
1072 return retval;
1073 tty_wait_until_sent(tty, 0);
1074 send_break(info, arg ? arg*(HZ/10) : HZ/4);
1075 return 0;
1076 case TIOCGSOFTCAR:
1077 error = put_user(C_CLOCAL(tty) ? 1 : 0,
1078 (unsigned long *) arg);
1079 if (error)
1080 return error;
1081 return 0;
1082 case TIOCSSOFTCAR:
1083 get_user(arg, (unsigned long *) arg);
1084 tty->termios->c_cflag =
1085 ((tty->termios->c_cflag & ~CLOCAL) |
1086 (arg ? CLOCAL : 0));
1087 return 0;
1088 case TIOCGSERIAL:
1089 if (access_ok(VERIFY_WRITE, (void *) arg,
1090 sizeof(struct serial_struct)))
1091 return get_serial_info(info,
1092 (struct serial_struct *) arg);
1093 return -EFAULT;
1094 case TIOCSSERIAL:
1095 return set_serial_info(info,
1096 (struct serial_struct *) arg);
1097 case TIOCSERGETLSR: /* Get line status register */
1098 if (access_ok(VERIFY_WRITE, (void *) arg,
1099 sizeof(unsigned int)))
1100 return get_lsr_info(info, (unsigned int *) arg);
1101 return -EFAULT;
1102 case TIOCSERGSTRUCT:
1103 error = copy_to_user((struct mcf_serial *) arg,
1104 info, sizeof(struct mcf_serial));
1105 if (error)
1106 return -EFAULT;
1107 return 0;
1108
1109 #ifdef TIOCSET422
1110 case TIOCSET422: {
1111 unsigned int val;
1112 get_user(val, (unsigned int *) arg);
1113 mcf_setpa(MCFPP_PA11, (val ? 0 : MCFPP_PA11));
1114 break;
1115 }
1116 case TIOCGET422: {
1117 unsigned int val;
1118 val = (mcf_getpa() & MCFPP_PA11) ? 0 : 1;
1119 put_user(val, (unsigned int *) arg);
1120 break;
1121 }
1122 #endif
1123
1124 default:
1125 return -ENOIOCTLCMD;
1126 }
1127 return 0;
1128 }
1129
1130 static void mcfrs_set_termios(struct tty_struct *tty, struct termios *old_termios)
1131 {
1132 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
1133
1134 if (tty->termios->c_cflag == old_termios->c_cflag)
1135 return;
1136
1137 mcfrs_change_speed(info);
1138
1139 if ((old_termios->c_cflag & CRTSCTS) &&
1140 !(tty->termios->c_cflag & CRTSCTS)) {
1141 tty->hw_stopped = 0;
1142 mcfrs_setsignals(info, -1, 1);
1143 #if 0
1144 mcfrs_start(tty);
1145 #endif
1146 }
1147 }
1148
1149 /*
1150 * ------------------------------------------------------------
1151 * mcfrs_close()
1152 *
1153 * This routine is called when the serial port gets closed. First, we
1154 * wait for the last remaining data to be sent. Then, we unlink its
1155 * S structure from the interrupt chain if necessary, and we free
1156 * that IRQ if nothing is left in the chain.
1157 * ------------------------------------------------------------
1158 */
1159 static void mcfrs_close(struct tty_struct *tty, struct file * filp)
1160 {
1161 volatile unsigned char *uartp;
1162 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
1163 unsigned long flags;
1164
1165 if (!info || serial_paranoia_check(info, tty->name, "mcfrs_close"))
1166 return;
1167
1168 local_irq_save(flags);
1169
1170 if (tty_hung_up_p(filp)) {
1171 local_irq_restore(flags);
1172 return;
1173 }
1174
1175 #ifdef SERIAL_DEBUG_OPEN
1176 printk("mcfrs_close ttyS%d, count = %d\n", info->line, info->count);
1177 #endif
1178 if ((tty->count == 1) && (info->count != 1)) {
1179 /*
1180 * Uh, oh. tty->count is 1, which means that the tty
1181 * structure will be freed. Info->count should always
1182 * be one in these conditions. If it's greater than
1183 * one, we've got real problems, since it means the
1184 * serial port won't be shutdown.
1185 */
1186 printk("MCFRS: bad serial port count; tty->count is 1, "
1187 "info->count is %d\n", info->count);
1188 info->count = 1;
1189 }
1190 if (--info->count < 0) {
1191 printk("MCFRS: bad serial port count for ttyS%d: %d\n",
1192 info->line, info->count);
1193 info->count = 0;
1194 }
1195 if (info->count) {
1196 local_irq_restore(flags);
1197 return;
1198 }
1199 info->flags |= ASYNC_CLOSING;
1200
1201 /*
1202 * Now we wait for the transmit buffer to clear; and we notify
1203 * the line discipline to only process XON/XOFF characters.
1204 */
1205 tty->closing = 1;
1206 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1207 tty_wait_until_sent(tty, info->closing_wait);
1208
1209 /*
1210 * At this point we stop accepting input. To do this, we
1211 * disable the receive line status interrupts, and tell the
1212 * interrupt driver to stop checking the data ready bit in the
1213 * line status register.
1214 */
1215 info->imr &= ~MCFUART_UIR_RXREADY;
1216 uartp = info->addr;
1217 uartp[MCFUART_UIMR] = info->imr;
1218
1219 #if 0
1220 /* FIXME: do we need to keep this enabled for console?? */
1221 if (mcfrs_console_inited && (mcfrs_console_port == info->line)) {
1222 /* Do not disable the UART */ ;
1223 } else
1224 #endif
1225 shutdown(info);
1226 if (tty->driver->flush_buffer)
1227 tty->driver->flush_buffer(tty);
1228 tty_ldisc_flush(tty);
1229
1230 tty->closing = 0;
1231 info->event = 0;
1232 info->tty = 0;
1233 #if 0
1234 if (tty->ldisc.num != ldiscs[N_TTY].num) {
1235 if (tty->ldisc.close)
1236 (tty->ldisc.close)(tty);
1237 tty->ldisc = ldiscs[N_TTY];
1238 tty->termios->c_line = N_TTY;
1239 if (tty->ldisc.open)
1240 (tty->ldisc.open)(tty);
1241 }
1242 #endif
1243 if (info->blocked_open) {
1244 if (info->close_delay) {
1245 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1246 }
1247 wake_up_interruptible(&info->open_wait);
1248 }
1249 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1250 wake_up_interruptible(&info->close_wait);
1251 local_irq_restore(flags);
1252 }
1253
1254 /*
1255 * mcfrs_wait_until_sent() --- wait until the transmitter is empty
1256 */
1257 static void
1258 mcfrs_wait_until_sent(struct tty_struct *tty, int timeout)
1259 {
1260 #ifdef CONFIG_M5272
1261 #define MCF5272_FIFO_SIZE 25 /* fifo size + shift reg */
1262
1263 struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
1264 volatile unsigned char *uartp;
1265 unsigned long orig_jiffies, fifo_time, char_time, fifo_cnt;
1266
1267 if (serial_paranoia_check(info, tty->name, "mcfrs_wait_until_sent"))
1268 return;
1269
1270 orig_jiffies = jiffies;
1271
1272 /*
1273 * Set the check interval to be 1/5 of the approximate time
1274 * to send the entire fifo, and make it at least 1. The check
1275 * interval should also be less than the timeout.
1276 *
1277 * Note: we have to use pretty tight timings here to satisfy
1278 * the NIST-PCTS.
1279 */
1280 fifo_time = (MCF5272_FIFO_SIZE * HZ * 10) / info->baud;
1281 char_time = fifo_time / 5;
1282 if (char_time == 0)
1283 char_time = 1;
1284 if (timeout && timeout < char_time)
1285 char_time = timeout;
1286
1287 /*
1288 * Clamp the timeout period at 2 * the time to empty the
1289 * fifo. Just to be safe, set the minimum at .5 seconds.
1290 */
1291 fifo_time *= 2;
1292 if (fifo_time < (HZ/2))
1293 fifo_time = HZ/2;
1294 if (!timeout || timeout > fifo_time)
1295 timeout = fifo_time;
1296
1297 /*
1298 * Account for the number of bytes in the UART
1299 * transmitter FIFO plus any byte being shifted out.
1300 */
1301 uartp = (volatile unsigned char *) info->addr;
1302 for (;;) {
1303 fifo_cnt = (uartp[MCFUART_UTF] & MCFUART_UTF_TXB);
1304 if ((uartp[MCFUART_USR] & (MCFUART_USR_TXREADY|
1305 MCFUART_USR_TXEMPTY)) ==
1306 MCFUART_USR_TXREADY)
1307 fifo_cnt++;
1308 if (fifo_cnt == 0)
1309 break;
1310 msleep_interruptible(jiffies_to_msecs(char_time));
1311 if (signal_pending(current))
1312 break;
1313 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1314 break;
1315 }
1316 #else
1317 /*
1318 * For the other coldfire models, assume all data has been sent
1319 */
1320 #endif
1321 }
1322
1323 /*
1324 * mcfrs_hangup() --- called by tty_hangup() when a hangup is signaled.
1325 */
1326 void mcfrs_hangup(struct tty_struct *tty)
1327 {
1328 struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
1329
1330 if (serial_paranoia_check(info, tty->name, "mcfrs_hangup"))
1331 return;
1332
1333 mcfrs_flush_buffer(tty);
1334 shutdown(info);
1335 info->event = 0;
1336 info->count = 0;
1337 info->flags &= ~ASYNC_NORMAL_ACTIVE;
1338 info->tty = 0;
1339 wake_up_interruptible(&info->open_wait);
1340 }
1341
1342 /*
1343 * ------------------------------------------------------------
1344 * mcfrs_open() and friends
1345 * ------------------------------------------------------------
1346 */
1347 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1348 struct mcf_serial *info)
1349 {
1350 DECLARE_WAITQUEUE(wait, current);
1351 int retval;
1352 int do_clocal = 0;
1353
1354 /*
1355 * If the device is in the middle of being closed, then block
1356 * until it's done, and then try again.
1357 */
1358 if (info->flags & ASYNC_CLOSING) {
1359 interruptible_sleep_on(&info->close_wait);
1360 #ifdef SERIAL_DO_RESTART
1361 if (info->flags & ASYNC_HUP_NOTIFY)
1362 return -EAGAIN;
1363 else
1364 return -ERESTARTSYS;
1365 #else
1366 return -EAGAIN;
1367 #endif
1368 }
1369
1370 /*
1371 * If non-blocking mode is set, or the port is not enabled,
1372 * then make the check up front and then exit.
1373 */
1374 if ((filp->f_flags & O_NONBLOCK) ||
1375 (tty->flags & (1 << TTY_IO_ERROR))) {
1376 info->flags |= ASYNC_NORMAL_ACTIVE;
1377 return 0;
1378 }
1379
1380 if (tty->termios->c_cflag & CLOCAL)
1381 do_clocal = 1;
1382
1383 /*
1384 * Block waiting for the carrier detect and the line to become
1385 * free (i.e., not in use by the callout). While we are in
1386 * this loop, info->count is dropped by one, so that
1387 * mcfrs_close() knows when to free things. We restore it upon
1388 * exit, either normal or abnormal.
1389 */
1390 retval = 0;
1391 add_wait_queue(&info->open_wait, &wait);
1392 #ifdef SERIAL_DEBUG_OPEN
1393 printk("block_til_ready before block: ttyS%d, count = %d\n",
1394 info->line, info->count);
1395 #endif
1396 info->count--;
1397 info->blocked_open++;
1398 while (1) {
1399 local_irq_disable();
1400 mcfrs_setsignals(info, 1, 1);
1401 local_irq_enable();
1402 current->state = TASK_INTERRUPTIBLE;
1403 if (tty_hung_up_p(filp) ||
1404 !(info->flags & ASYNC_INITIALIZED)) {
1405 #ifdef SERIAL_DO_RESTART
1406 if (info->flags & ASYNC_HUP_NOTIFY)
1407 retval = -EAGAIN;
1408 else
1409 retval = -ERESTARTSYS;
1410 #else
1411 retval = -EAGAIN;
1412 #endif
1413 break;
1414 }
1415 if (!(info->flags & ASYNC_CLOSING) &&
1416 (do_clocal || (mcfrs_getsignals(info) & TIOCM_CD)))
1417 break;
1418 if (signal_pending(current)) {
1419 retval = -ERESTARTSYS;
1420 break;
1421 }
1422 #ifdef SERIAL_DEBUG_OPEN
1423 printk("block_til_ready blocking: ttyS%d, count = %d\n",
1424 info->line, info->count);
1425 #endif
1426 schedule();
1427 }
1428 current->state = TASK_RUNNING;
1429 remove_wait_queue(&info->open_wait, &wait);
1430 if (!tty_hung_up_p(filp))
1431 info->count++;
1432 info->blocked_open--;
1433 #ifdef SERIAL_DEBUG_OPEN
1434 printk("block_til_ready after blocking: ttyS%d, count = %d\n",
1435 info->line, info->count);
1436 #endif
1437 if (retval)
1438 return retval;
1439 info->flags |= ASYNC_NORMAL_ACTIVE;
1440 return 0;
1441 }
1442
1443 /*
1444 * This routine is called whenever a serial port is opened. It
1445 * enables interrupts for a serial port, linking in its structure into
1446 * the IRQ chain. It also performs the serial-specific
1447 * initialization for the tty structure.
1448 */
1449 int mcfrs_open(struct tty_struct *tty, struct file * filp)
1450 {
1451 struct mcf_serial *info;
1452 int retval, line;
1453
1454 line = tty->index;
1455 if ((line < 0) || (line >= NR_PORTS))
1456 return -ENODEV;
1457 info = mcfrs_table + line;
1458 if (serial_paranoia_check(info, tty->name, "mcfrs_open"))
1459 return -ENODEV;
1460 #ifdef SERIAL_DEBUG_OPEN
1461 printk("mcfrs_open %s, count = %d\n", tty->name, info->count);
1462 #endif
1463 info->count++;
1464 tty->driver_data = info;
1465 info->tty = tty;
1466
1467 /*
1468 * Start up serial port
1469 */
1470 retval = startup(info);
1471 if (retval)
1472 return retval;
1473
1474 retval = block_til_ready(tty, filp, info);
1475 if (retval) {
1476 #ifdef SERIAL_DEBUG_OPEN
1477 printk("mcfrs_open returning after block_til_ready with %d\n",
1478 retval);
1479 #endif
1480 return retval;
1481 }
1482
1483 #ifdef SERIAL_DEBUG_OPEN
1484 printk("mcfrs_open %s successful...\n", tty->name);
1485 #endif
1486 return 0;
1487 }
1488
1489 /*
1490 * Based on the line number set up the internal interrupt stuff.
1491 */
1492 static void mcfrs_irqinit(struct mcf_serial *info)
1493 {
1494 #if defined(CONFIG_M5272)
1495 volatile unsigned long *icrp;
1496 volatile unsigned long *portp;
1497 volatile unsigned char *uartp;
1498
1499 uartp = info->addr;
1500 icrp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_ICR2);
1501
1502 switch (info->line) {
1503 case 0:
1504 *icrp = 0xe0000000;
1505 break;
1506 case 1:
1507 *icrp = 0x0e000000;
1508 break;
1509 default:
1510 printk("MCFRS: don't know how to handle UART %d interrupt?\n",
1511 info->line);
1512 return;
1513 }
1514
1515 /* Enable the output lines for the serial ports */
1516 portp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_PBCNT);
1517 *portp = (*portp & ~0x000000ff) | 0x00000055;
1518 portp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_PDCNT);
1519 *portp = (*portp & ~0x000003fc) | 0x000002a8;
1520 #elif defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x)
1521 volatile unsigned char *icrp, *uartp;
1522 volatile unsigned long *imrp;
1523
1524 uartp = info->addr;
1525
1526 icrp = (volatile unsigned char *) (MCF_MBAR + MCFICM_INTC0 +
1527 MCFINTC_ICR0 + MCFINT_UART0 + info->line);
1528 *icrp = 0x33; /* UART0 with level 6, priority 3 */
1529
1530 imrp = (volatile unsigned long *) (MCF_MBAR + MCFICM_INTC0 +
1531 MCFINTC_IMRL);
1532 *imrp &= ~((1 << (info->irq - MCFINT_VECBASE)) | 1);
1533 #elif defined(CONFIG_M520x)
1534 volatile unsigned char *icrp, *uartp;
1535 volatile unsigned long *imrp;
1536
1537 uartp = info->addr;
1538
1539 icrp = (volatile unsigned char *) (MCF_MBAR + MCFICM_INTC0 +
1540 MCFINTC_ICR0 + MCFINT_UART0 + info->line);
1541 *icrp = 0x03;
1542
1543 imrp = (volatile unsigned long *) (MCF_MBAR + MCFICM_INTC0 +
1544 MCFINTC_IMRL);
1545 *imrp &= ~((1 << (info->irq - MCFINT_VECBASE)) | 1);
1546 if (info->line < 2) {
1547 unsigned short *uart_par;
1548 uart_par = (unsigned short *)(MCF_IPSBAR + MCF_GPIO_PAR_UART);
1549 if (info->line == 0)
1550 *uart_par |= MCF_GPIO_PAR_UART_PAR_UTXD0
1551 | MCF_GPIO_PAR_UART_PAR_URXD0;
1552 else if (info->line == 1)
1553 *uart_par |= MCF_GPIO_PAR_UART_PAR_UTXD1
1554 | MCF_GPIO_PAR_UART_PAR_URXD1;
1555 } else if (info->line == 2) {
1556 unsigned char *feci2c_par;
1557 feci2c_par = (unsigned char *)(MCF_IPSBAR + MCF_GPIO_PAR_FECI2C);
1558 *feci2c_par &= ~0x0F;
1559 *feci2c_par |= MCF_GPIO_PAR_FECI2C_PAR_SCL_UTXD2
1560 | MCF_GPIO_PAR_FECI2C_PAR_SDA_URXD2;
1561 }
1562 #else
1563 volatile unsigned char *icrp, *uartp;
1564
1565 switch (info->line) {
1566 case 0:
1567 icrp = (volatile unsigned char *) (MCF_MBAR + MCFSIM_UART1ICR);
1568 *icrp = /*MCFSIM_ICR_AUTOVEC |*/ MCFSIM_ICR_LEVEL6 |
1569 MCFSIM_ICR_PRI1;
1570 mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_UART1);
1571 break;
1572 case 1:
1573 icrp = (volatile unsigned char *) (MCF_MBAR + MCFSIM_UART2ICR);
1574 *icrp = /*MCFSIM_ICR_AUTOVEC |*/ MCFSIM_ICR_LEVEL6 |
1575 MCFSIM_ICR_PRI2;
1576 mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_UART2);
1577 break;
1578 default:
1579 printk("MCFRS: don't know how to handle UART %d interrupt?\n",
1580 info->line);
1581 return;
1582 }
1583
1584 uartp = info->addr;
1585 uartp[MCFUART_UIVR] = info->irq;
1586 #endif
1587
1588 /* Clear mask, so no surprise interrupts. */
1589 uartp[MCFUART_UIMR] = 0;
1590
1591 if (request_irq(info->irq, mcfrs_interrupt, SA_INTERRUPT,
1592 "ColdFire UART", NULL)) {
1593 printk("MCFRS: Unable to attach ColdFire UART %d interrupt "
1594 "vector=%d\n", info->line, info->irq);
1595 }
1596
1597 return;
1598 }
1599
1600
1601 char *mcfrs_drivername = "ColdFire internal UART serial driver version 1.00\n";
1602
1603
1604 /*
1605 * Serial stats reporting...
1606 */
1607 int mcfrs_readproc(char *page, char **start, off_t off, int count,
1608 int *eof, void *data)
1609 {
1610 struct mcf_serial *info;
1611 char str[20];
1612 int len, sigs, i;
1613
1614 len = sprintf(page, mcfrs_drivername);
1615 for (i = 0; (i < NR_PORTS); i++) {
1616 info = &mcfrs_table[i];
1617 len += sprintf((page + len), "%d: port:%x irq=%d baud:%d ",
1618 i, (unsigned int) info->addr, info->irq, info->baud);
1619 if (info->stats.rx || info->stats.tx)
1620 len += sprintf((page + len), "tx:%d rx:%d ",
1621 info->stats.tx, info->stats.rx);
1622 if (info->stats.rxframing)
1623 len += sprintf((page + len), "fe:%d ",
1624 info->stats.rxframing);
1625 if (info->stats.rxparity)
1626 len += sprintf((page + len), "pe:%d ",
1627 info->stats.rxparity);
1628 if (info->stats.rxbreak)
1629 len += sprintf((page + len), "brk:%d ",
1630 info->stats.rxbreak);
1631 if (info->stats.rxoverrun)
1632 len += sprintf((page + len), "oe:%d ",
1633 info->stats.rxoverrun);
1634
1635 str[0] = str[1] = 0;
1636 if ((sigs = mcfrs_getsignals(info))) {
1637 if (sigs & TIOCM_RTS)
1638 strcat(str, "|RTS");
1639 if (sigs & TIOCM_CTS)
1640 strcat(str, "|CTS");
1641 if (sigs & TIOCM_DTR)
1642 strcat(str, "|DTR");
1643 if (sigs & TIOCM_CD)
1644 strcat(str, "|CD");
1645 }
1646
1647 len += sprintf((page + len), "%s\n", &str[1]);
1648 }
1649
1650 return(len);
1651 }
1652
1653
1654 /* Finally, routines used to initialize the serial driver. */
1655
1656 static void show_serial_version(void)
1657 {
1658 printk(mcfrs_drivername);
1659 }
1660
1661 static struct tty_operations mcfrs_ops = {
1662 .open = mcfrs_open,
1663 .close = mcfrs_close,
1664 .write = mcfrs_write,
1665 .flush_chars = mcfrs_flush_chars,
1666 .write_room = mcfrs_write_room,
1667 .chars_in_buffer = mcfrs_chars_in_buffer,
1668 .flush_buffer = mcfrs_flush_buffer,
1669 .ioctl = mcfrs_ioctl,
1670 .throttle = mcfrs_throttle,
1671 .unthrottle = mcfrs_unthrottle,
1672 .set_termios = mcfrs_set_termios,
1673 .stop = mcfrs_stop,
1674 .start = mcfrs_start,
1675 .hangup = mcfrs_hangup,
1676 .read_proc = mcfrs_readproc,
1677 .wait_until_sent = mcfrs_wait_until_sent,
1678 .tiocmget = mcfrs_tiocmget,
1679 .tiocmset = mcfrs_tiocmset,
1680 };
1681
1682 /* mcfrs_init inits the driver */
1683 static int __init
1684 mcfrs_init(void)
1685 {
1686 struct mcf_serial *info;
1687 unsigned long flags;
1688 int i;
1689
1690 /* Setup base handler, and timer table. */
1691 #ifdef MCFPP_DCD0
1692 init_timer(&mcfrs_timer_struct);
1693 mcfrs_timer_struct.function = mcfrs_timer;
1694 mcfrs_timer_struct.data = 0;
1695 mcfrs_timer_struct.expires = jiffies + HZ/25;
1696 add_timer(&mcfrs_timer_struct);
1697 mcfrs_ppstatus = mcf_getppdata() & (MCFPP_DCD0 | MCFPP_DCD1);
1698 #endif
1699 mcfrs_serial_driver = alloc_tty_driver(NR_PORTS);
1700 if (!mcfrs_serial_driver)
1701 return -ENOMEM;
1702
1703 show_serial_version();
1704
1705 /* Initialize the tty_driver structure */
1706 mcfrs_serial_driver->owner = THIS_MODULE;
1707 mcfrs_serial_driver->name = "ttyS";
1708 mcfrs_serial_driver->devfs_name = "ttys/";
1709 mcfrs_serial_driver->driver_name = "serial";
1710 mcfrs_serial_driver->major = TTY_MAJOR;
1711 mcfrs_serial_driver->minor_start = 64;
1712 mcfrs_serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1713 mcfrs_serial_driver->subtype = SERIAL_TYPE_NORMAL;
1714 mcfrs_serial_driver->init_termios = tty_std_termios;
1715
1716 mcfrs_serial_driver->init_termios.c_cflag =
1717 mcfrs_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1718 mcfrs_serial_driver->flags = TTY_DRIVER_REAL_RAW;
1719
1720 tty_set_operations(mcfrs_serial_driver, &mcfrs_ops);
1721
1722 if (tty_register_driver(mcfrs_serial_driver)) {
1723 printk("MCFRS: Couldn't register serial driver\n");
1724 put_tty_driver(mcfrs_serial_driver);
1725 return(-EBUSY);
1726 }
1727
1728 local_irq_save(flags);
1729
1730 /*
1731 * Configure all the attached serial ports.
1732 */
1733 for (i = 0, info = mcfrs_table; (i < NR_PORTS); i++, info++) {
1734 info->magic = SERIAL_MAGIC;
1735 info->line = i;
1736 info->tty = 0;
1737 info->custom_divisor = 16;
1738 info->close_delay = 50;
1739 info->closing_wait = 3000;
1740 info->x_char = 0;
1741 info->event = 0;
1742 info->count = 0;
1743 info->blocked_open = 0;
1744 INIT_WORK(&info->tqueue, mcfrs_offintr, info);
1745 INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info);
1746 init_waitqueue_head(&info->open_wait);
1747 init_waitqueue_head(&info->close_wait);
1748
1749 info->imr = 0;
1750 mcfrs_setsignals(info, 0, 0);
1751 mcfrs_irqinit(info);
1752
1753 printk("ttyS%d at 0x%04x (irq = %d)", info->line,
1754 (unsigned int) info->addr, info->irq);
1755 printk(" is a builtin ColdFire UART\n");
1756 }
1757
1758 local_irq_restore(flags);
1759 return 0;
1760 }
1761
1762 module_init(mcfrs_init);
1763
1764 /****************************************************************************/
1765 /* Serial Console */
1766 /****************************************************************************/
1767
1768 /*
1769 * Quick and dirty UART initialization, for console output.
1770 */
1771
1772 void mcfrs_init_console(void)
1773 {
1774 volatile unsigned char *uartp;
1775 unsigned int clk;
1776
1777 /*
1778 * Reset UART, get it into known state...
1779 */
1780 uartp = (volatile unsigned char *) (MCF_MBAR +
1781 (mcfrs_console_port ? MCFUART_BASE2 : MCFUART_BASE1));
1782
1783 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
1784 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
1785 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETMRPTR; /* reset MR pointer */
1786
1787 /*
1788 * Set port for defined baud , 8 data bits, 1 stop bit, no parity.
1789 */
1790 uartp[MCFUART_UMR] = MCFUART_MR1_PARITYNONE | MCFUART_MR1_CS8;
1791 uartp[MCFUART_UMR] = MCFUART_MR2_STOP1;
1792
1793 clk = ((MCF_BUSCLK / mcfrs_console_baud) + 16) / 32; /* set baud */
1794 uartp[MCFUART_UBG1] = (clk & 0xff00) >> 8; /* set msb baud */
1795 uartp[MCFUART_UBG2] = (clk & 0xff); /* set lsb baud */
1796
1797 uartp[MCFUART_UCSR] = MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER;
1798 uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
1799
1800 mcfrs_console_inited++;
1801 return;
1802 }
1803
1804
1805 /*
1806 * Setup for console. Argument comes from the boot command line.
1807 */
1808
1809 int mcfrs_console_setup(struct console *cp, char *arg)
1810 {
1811 int i, n = CONSOLE_BAUD_RATE;
1812
1813 if (!cp)
1814 return(-1);
1815
1816 if (!strncmp(cp->name, "ttyS", 4))
1817 mcfrs_console_port = cp->index;
1818 else if (!strncmp(cp->name, "cua", 3))
1819 mcfrs_console_port = cp->index;
1820 else
1821 return(-1);
1822
1823 if (arg)
1824 n = simple_strtoul(arg,NULL,0);
1825 for (i = 0; i < MCFRS_BAUD_TABLE_SIZE; i++)
1826 if (mcfrs_baud_table[i] == n)
1827 break;
1828 if (i < MCFRS_BAUD_TABLE_SIZE) {
1829 mcfrs_console_baud = n;
1830 mcfrs_console_cbaud = 0;
1831 if (i > 15) {
1832 mcfrs_console_cbaud |= CBAUDEX;
1833 i -= 15;
1834 }
1835 mcfrs_console_cbaud |= i;
1836 }
1837 mcfrs_init_console(); /* make sure baud rate changes */
1838 return(0);
1839 }
1840
1841
1842 static struct tty_driver *mcfrs_console_device(struct console *c, int *index)
1843 {
1844 *index = c->index;
1845 return mcfrs_serial_driver;
1846 }
1847
1848
1849 /*
1850 * Output a single character, using UART polled mode.
1851 * This is used for console output.
1852 */
1853
1854 void mcfrs_put_char(char ch)
1855 {
1856 volatile unsigned char *uartp;
1857 unsigned long flags;
1858 int i;
1859
1860 uartp = (volatile unsigned char *) (MCF_MBAR +
1861 (mcfrs_console_port ? MCFUART_BASE2 : MCFUART_BASE1));
1862
1863 local_irq_save(flags);
1864 for (i = 0; (i < 0x10000); i++) {
1865 if (uartp[MCFUART_USR] & MCFUART_USR_TXREADY)
1866 break;
1867 }
1868 if (i < 0x10000) {
1869 uartp[MCFUART_UTB] = ch;
1870 for (i = 0; (i < 0x10000); i++)
1871 if (uartp[MCFUART_USR] & MCFUART_USR_TXEMPTY)
1872 break;
1873 }
1874 if (i >= 0x10000)
1875 mcfrs_init_console(); /* try and get it back */
1876 local_irq_restore(flags);
1877
1878 return;
1879 }
1880
1881
1882 /*
1883 * rs_console_write is registered for printk output.
1884 */
1885
1886 void mcfrs_console_write(struct console *cp, const char *p, unsigned len)
1887 {
1888 if (!mcfrs_console_inited)
1889 mcfrs_init_console();
1890 while (len-- > 0) {
1891 if (*p == '\n')
1892 mcfrs_put_char('\r');
1893 mcfrs_put_char(*p++);
1894 }
1895 }
1896
1897 /*
1898 * declare our consoles
1899 */
1900
1901 struct console mcfrs_console = {
1902 .name = "ttyS",
1903 .write = mcfrs_console_write,
1904 .device = mcfrs_console_device,
1905 .setup = mcfrs_console_setup,
1906 .flags = CON_PRINTBUFFER,
1907 .index = -1,
1908 };
1909
1910 static int __init mcfrs_console_init(void)
1911 {
1912 register_console(&mcfrs_console);
1913 return 0;
1914 }
1915
1916 console_initcall(mcfrs_console_init);
1917
1918 /****************************************************************************/
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