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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / serial / mcfserial.c
blob99af084c7cecdfadc5f32205c05cc97daec48eda
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_HW_FEITH)
61 #define CONSOLE_BAUD_RATE 38400
62 #define DEFAULT_CBAUD B38400
63 #elif defined(CONFIG_MOD5272) || defined(CONFIG_M5208EVB) || \
64 defined(CONFIG_M5329EVB) || defined(CONFIG_GILBARCO)
65 #define CONSOLE_BAUD_RATE 115200
66 #define DEFAULT_CBAUD B115200
67 #elif defined(CONFIG_ARNEWSH) || defined(CONFIG_FREESCALE) || \
68 defined(CONFIG_senTec) || defined(CONFIG_SNEHA) || defined(CONFIG_AVNET)
69 #define CONSOLE_BAUD_RATE 19200
70 #define DEFAULT_CBAUD B19200
71 #endif
72
73 #ifndef CONSOLE_BAUD_RATE
74 #define CONSOLE_BAUD_RATE 9600
75 #define DEFAULT_CBAUD B9600
76 #endif
77
78 int mcfrs_console_inited = 0;
79 int mcfrs_console_port = -1;
80 int mcfrs_console_baud = CONSOLE_BAUD_RATE;
81 int mcfrs_console_cbaud = DEFAULT_CBAUD;
82
83 /*
84 * Driver data structures.
85 */
86 static struct tty_driver *mcfrs_serial_driver;
87
88 /* number of characters left in xmit buffer before we ask for more */
89 #define WAKEUP_CHARS 256
90
91 /* Debugging...
92 */
93 #undef SERIAL_DEBUG_OPEN
94 #undef SERIAL_DEBUG_FLOW
95
96 #if defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x) || \
97 defined(CONFIG_M520x) || defined(CONFIG_M532x)
98 #define IRQBASE (MCFINT_VECBASE+MCFINT_UART0)
99 #else
100 #define IRQBASE 73
101 #endif
102
103 /*
104 * Configuration table, UARTs to look for at startup.
105 */
106 static struct mcf_serial mcfrs_table[] = {
107 { /* ttyS0 */
108 .magic = 0,
109 .addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE1),
110 .irq = IRQBASE,
111 .flags = ASYNC_BOOT_AUTOCONF,
112 },
113 #ifdef MCFUART_BASE2
114 { /* ttyS1 */
115 .magic = 0,
116 .addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE2),
117 .irq = IRQBASE+1,
118 .flags = ASYNC_BOOT_AUTOCONF,
119 },
120 #endif
121 #ifdef MCFUART_BASE3
122 { /* ttyS2 */
123 .magic = 0,
124 .addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE3),
125 .irq = IRQBASE+2,
126 .flags = ASYNC_BOOT_AUTOCONF,
127 },
128 #endif
129 #ifdef MCFUART_BASE4
130 { /* ttyS3 */
131 .magic = 0,
132 .addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE4),
133 .irq = IRQBASE+3,
134 .flags = ASYNC_BOOT_AUTOCONF,
135 },
136 #endif
137 };
138
139
140 #define NR_PORTS (sizeof(mcfrs_table) / sizeof(struct mcf_serial))
141
142 /*
143 * This is used to figure out the divisor speeds and the timeouts.
144 */
145 static int mcfrs_baud_table[] = {
146 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
147 9600, 19200, 38400, 57600, 115200, 230400, 460800, 0
148 };
149 #define MCFRS_BAUD_TABLE_SIZE \
150 (sizeof(mcfrs_baud_table)/sizeof(mcfrs_baud_table[0]))
151
152
153 #ifdef CONFIG_MAGIC_SYSRQ
154 /*
155 * Magic system request keys. Used for debugging...
156 */
157 extern int magic_sysrq_key(int ch);
158 #endif
159
160
161 /*
162 * Forware declarations...
163 */
164 static void mcfrs_change_speed(struct mcf_serial *info);
165 static void mcfrs_wait_until_sent(struct tty_struct *tty, int timeout);
166
167
168 static inline int serial_paranoia_check(struct mcf_serial *info,
169 char *name, const char *routine)
170 {
171 #ifdef SERIAL_PARANOIA_CHECK
172 static const char badmagic[] =
173 "MCFRS(warning): bad magic number for serial struct %s in %s\n";
174 static const char badinfo[] =
175 "MCFRS(warning): null mcf_serial for %s in %s\n";
176
177 if (!info) {
178 printk(badinfo, name, routine);
179 return 1;
180 }
181 if (info->magic != SERIAL_MAGIC) {
182 printk(badmagic, name, routine);
183 return 1;
184 }
185 #endif
186 return 0;
187 }
188
189 /*
190 * Sets or clears DTR and RTS on the requested line.
191 */
192 static void mcfrs_setsignals(struct mcf_serial *info, int dtr, int rts)
193 {
194 volatile unsigned char *uartp;
195 unsigned long flags;
196
197 #if 0
198 printk("%s(%d): mcfrs_setsignals(info=%x,dtr=%d,rts=%d)\n",
199 __FILE__, __LINE__, info, dtr, rts);
200 #endif
201
202 local_irq_save(flags);
203 if (dtr >= 0) {
204 #ifdef MCFPP_DTR0
205 if (info->line)
206 mcf_setppdata(MCFPP_DTR1, (dtr ? 0 : MCFPP_DTR1));
207 else
208 mcf_setppdata(MCFPP_DTR0, (dtr ? 0 : MCFPP_DTR0));
209 #endif
210 }
211 if (rts >= 0) {
212 uartp = info->addr;
213 if (rts) {
214 info->sigs |= TIOCM_RTS;
215 uartp[MCFUART_UOP1] = MCFUART_UOP_RTS;
216 } else {
217 info->sigs &= ~TIOCM_RTS;
218 uartp[MCFUART_UOP0] = MCFUART_UOP_RTS;
219 }
220 }
221 local_irq_restore(flags);
222 return;
223 }
224
225 /*
226 * Gets values of serial signals.
227 */
228 static int mcfrs_getsignals(struct mcf_serial *info)
229 {
230 volatile unsigned char *uartp;
231 unsigned long flags;
232 int sigs;
233 #if defined(CONFIG_NETtel) && defined(CONFIG_M5307)
234 unsigned short ppdata;
235 #endif
236
237 #if 0
238 printk("%s(%d): mcfrs_getsignals(info=%x)\n", __FILE__, __LINE__);
239 #endif
240
241 local_irq_save(flags);
242 uartp = info->addr;
243 sigs = (uartp[MCFUART_UIPR] & MCFUART_UIPR_CTS) ? 0 : TIOCM_CTS;
244 sigs |= (info->sigs & TIOCM_RTS);
245
246 #ifdef MCFPP_DCD0
247 {
248 unsigned int ppdata;
249 ppdata = mcf_getppdata();
250 if (info->line == 0) {
251 sigs |= (ppdata & MCFPP_DCD0) ? 0 : TIOCM_CD;
252 sigs |= (ppdata & MCFPP_DTR0) ? 0 : TIOCM_DTR;
253 } else if (info->line == 1) {
254 sigs |= (ppdata & MCFPP_DCD1) ? 0 : TIOCM_CD;
255 sigs |= (ppdata & MCFPP_DTR1) ? 0 : TIOCM_DTR;
256 }
257 }
258 #endif
259
260 local_irq_restore(flags);
261 return(sigs);
262 }
263
264 /*
265 * ------------------------------------------------------------
266 * mcfrs_stop() and mcfrs_start()
267 *
268 * This routines are called before setting or resetting tty->stopped.
269 * They enable or disable transmitter interrupts, as necessary.
270 * ------------------------------------------------------------
271 */
272 static void mcfrs_stop(struct tty_struct *tty)
273 {
274 volatile unsigned char *uartp;
275 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
276 unsigned long flags;
277
278 if (serial_paranoia_check(info, tty->name, "mcfrs_stop"))
279 return;
280
281 local_irq_save(flags);
282 uartp = info->addr;
283 info->imr &= ~MCFUART_UIR_TXREADY;
284 uartp[MCFUART_UIMR] = info->imr;
285 local_irq_restore(flags);
286 }
287
288 static void mcfrs_start(struct tty_struct *tty)
289 {
290 volatile unsigned char *uartp;
291 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
292 unsigned long flags;
293
294 if (serial_paranoia_check(info, tty->name, "mcfrs_start"))
295 return;
296
297 local_irq_save(flags);
298 if (info->xmit_cnt && info->xmit_buf) {
299 uartp = info->addr;
300 info->imr |= MCFUART_UIR_TXREADY;
301 uartp[MCFUART_UIMR] = info->imr;
302 }
303 local_irq_restore(flags);
304 }
305
306 /*
307 * ----------------------------------------------------------------------
308 *
309 * Here starts the interrupt handling routines. All of the following
310 * subroutines are declared as inline and are folded into
311 * mcfrs_interrupt(). They were separated out for readability's sake.
312 *
313 * Note: mcfrs_interrupt() is a "fast" interrupt, which means that it
314 * runs with interrupts turned off. People who may want to modify
315 * mcfrs_interrupt() should try to keep the interrupt handler as fast as
316 * possible. After you are done making modifications, it is not a bad
317 * idea to do:
318 *
319 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
320 *
321 * and look at the resulting assemble code in serial.s.
322 *
323 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
324 * -----------------------------------------------------------------------
325 */
326
327 static inline void receive_chars(struct mcf_serial *info)
328 {
329 volatile unsigned char *uartp;
330 struct tty_struct *tty = info->tty;
331 unsigned char status, ch, flag;
332
333 if (!tty)
334 return;
335
336 uartp = info->addr;
337
338 while ((status = uartp[MCFUART_USR]) & MCFUART_USR_RXREADY) {
339 ch = uartp[MCFUART_URB];
340 info->stats.rx++;
341
342 #ifdef CONFIG_MAGIC_SYSRQ
343 if (mcfrs_console_inited && (info->line == mcfrs_console_port)) {
344 if (magic_sysrq_key(ch))
345 continue;
346 }
347 #endif
348
349 flag = TTY_NORMAL;
350 if (status & MCFUART_USR_RXERR) {
351 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETERR;
352 if (status & MCFUART_USR_RXBREAK) {
353 info->stats.rxbreak++;
354 flag = TTY_BREAK;
355 } else if (status & MCFUART_USR_RXPARITY) {
356 info->stats.rxparity++;
357 flag = TTY_PARITY;
358 } else if (status & MCFUART_USR_RXOVERRUN) {
359 info->stats.rxoverrun++;
360 flag = TTY_OVERRUN;
361 } else if (status & MCFUART_USR_RXFRAMING) {
362 info->stats.rxframing++;
363 flag = TTY_FRAME;
364 }
365 }
366 tty_insert_flip_char(tty, ch, flag);
367 }
368 tty_schedule_flip(tty);
369 return;
370 }
371
372 static inline void transmit_chars(struct mcf_serial *info)
373 {
374 volatile unsigned char *uartp;
375
376 uartp = info->addr;
377
378 if (info->x_char) {
379 /* Send special char - probably flow control */
380 uartp[MCFUART_UTB] = info->x_char;
381 info->x_char = 0;
382 info->stats.tx++;
383 }
384
385 if ((info->xmit_cnt <= 0) || info->tty->stopped) {
386 info->imr &= ~MCFUART_UIR_TXREADY;
387 uartp[MCFUART_UIMR] = info->imr;
388 return;
389 }
390
391 while (uartp[MCFUART_USR] & MCFUART_USR_TXREADY) {
392 uartp[MCFUART_UTB] = info->xmit_buf[info->xmit_tail++];
393 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
394 info->stats.tx++;
395 if (--info->xmit_cnt <= 0)
396 break;
397 }
398
399 if (info->xmit_cnt < WAKEUP_CHARS)
400 schedule_work(&info->tqueue);
401 return;
402 }
403
404 /*
405 * This is the serial driver's generic interrupt routine
406 */
407 irqreturn_t mcfrs_interrupt(int irq, void *dev_id)
408 {
409 struct mcf_serial *info;
410 unsigned char isr;
411
412 info = &mcfrs_table[(irq - IRQBASE)];
413 isr = info->addr[MCFUART_UISR] & info->imr;
414
415 if (isr & MCFUART_UIR_RXREADY)
416 receive_chars(info);
417 if (isr & MCFUART_UIR_TXREADY)
418 transmit_chars(info);
419 return IRQ_HANDLED;
420 }
421
422 /*
423 * -------------------------------------------------------------------
424 * Here ends the serial interrupt routines.
425 * -------------------------------------------------------------------
426 */
427
428 static void mcfrs_offintr(struct work_struct *work)
429 {
430 struct mcf_serial *info = container_of(work, struct mcf_serial, tqueue);
431 struct tty_struct *tty = info->tty;
432
433 if (tty)
434 tty_wakeup(tty);
435 }
436
437
438 /*
439 * Change of state on a DCD line.
440 */
441 void mcfrs_modem_change(struct mcf_serial *info, int dcd)
442 {
443 if (info->count == 0)
444 return;
445
446 if (info->flags & ASYNC_CHECK_CD) {
447 if (dcd)
448 wake_up_interruptible(&info->open_wait);
449 else
450 schedule_work(&info->tqueue_hangup);
451 }
452 }
453
454
455 #ifdef MCFPP_DCD0
456
457 unsigned short mcfrs_ppstatus;
458
459 /*
460 * This subroutine is called when the RS_TIMER goes off. It is used
461 * to monitor the state of the DCD lines - since they have no edge
462 * sensors and interrupt generators.
463 */
464 static void mcfrs_timer(void)
465 {
466 unsigned int ppstatus, dcdval, i;
467
468 ppstatus = mcf_getppdata() & (MCFPP_DCD0 | MCFPP_DCD1);
469
470 if (ppstatus != mcfrs_ppstatus) {
471 for (i = 0; (i < 2); i++) {
472 dcdval = (i ? MCFPP_DCD1 : MCFPP_DCD0);
473 if ((ppstatus & dcdval) != (mcfrs_ppstatus & dcdval)) {
474 mcfrs_modem_change(&mcfrs_table[i],
475 ((ppstatus & dcdval) ? 0 : 1));
476 }
477 }
478 }
479 mcfrs_ppstatus = ppstatus;
480
481 /* Re-arm timer */
482 mcfrs_timer_struct.expires = jiffies + HZ/25;
483 add_timer(&mcfrs_timer_struct);
484 }
485
486 #endif /* MCFPP_DCD0 */
487
488
489 /*
490 * This routine is called from the scheduler tqueue when the interrupt
491 * routine has signalled that a hangup has occurred. The path of
492 * hangup processing is:
493 *
494 * serial interrupt routine -> (scheduler tqueue) ->
495 * do_serial_hangup() -> tty->hangup() -> mcfrs_hangup()
496 *
497 */
498 static void do_serial_hangup(struct work_struct *work)
499 {
500 struct mcf_serial *info = container_of(work, struct mcf_serial, tqueue_hangup);
501 struct tty_struct *tty = info->tty;
502
503 if (tty)
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 ktermios *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 = 0x30 + info->line; /* level 6, line based priority */
1529
1530 imrp = (volatile unsigned long *) (MCF_MBAR + MCFICM_INTC0 +
1531 MCFINTC_IMRL);
1532 *imrp &= ~((1 << (info->irq - MCFINT_VECBASE)) | 1);
1533 #if defined(CONFIG_M527x)
1534 {
1535 /*
1536 * External Pin Mask Setting & Enable External Pin for Interface
1537 * mrcbis@aliceposta.it
1538 */
1539 u16 *serpin_enable_mask;
1540 serpin_enable_mask = (u16 *) (MCF_IPSBAR + MCF_GPIO_PAR_UART);
1541 if (info->line == 0)
1542 *serpin_enable_mask |= UART0_ENABLE_MASK;
1543 else if (info->line == 1)
1544 *serpin_enable_mask |= UART1_ENABLE_MASK;
1545 else if (info->line == 2)
1546 *serpin_enable_mask |= UART2_ENABLE_MASK;
1547 }
1548 #endif
1549 #if defined(CONFIG_M528x)
1550 /* make sure PUAPAR is set for UART0 and UART1 */
1551 if (info->line < 2) {
1552 volatile unsigned char *portp = (volatile unsigned char *) (MCF_MBAR + MCF5282_GPIO_PUAPAR);
1553 *portp |= (0x03 << (info->line * 2));
1554 }
1555 #endif
1556 #elif defined(CONFIG_M520x)
1557 volatile unsigned char *icrp, *uartp;
1558 volatile unsigned long *imrp;
1559
1560 uartp = info->addr;
1561
1562 icrp = (volatile unsigned char *) (MCF_MBAR + MCFICM_INTC0 +
1563 MCFINTC_ICR0 + MCFINT_UART0 + info->line);
1564 *icrp = 0x03;
1565
1566 imrp = (volatile unsigned long *) (MCF_MBAR + MCFICM_INTC0 +
1567 MCFINTC_IMRL);
1568 *imrp &= ~((1 << (info->irq - MCFINT_VECBASE)) | 1);
1569 if (info->line < 2) {
1570 unsigned short *uart_par;
1571 uart_par = (unsigned short *)(MCF_IPSBAR + MCF_GPIO_PAR_UART);
1572 if (info->line == 0)
1573 *uart_par |= MCF_GPIO_PAR_UART_PAR_UTXD0
1574 | MCF_GPIO_PAR_UART_PAR_URXD0;
1575 else if (info->line == 1)
1576 *uart_par |= MCF_GPIO_PAR_UART_PAR_UTXD1
1577 | MCF_GPIO_PAR_UART_PAR_URXD1;
1578 } else if (info->line == 2) {
1579 unsigned char *feci2c_par;
1580 feci2c_par = (unsigned char *)(MCF_IPSBAR + MCF_GPIO_PAR_FECI2C);
1581 *feci2c_par &= ~0x0F;
1582 *feci2c_par |= MCF_GPIO_PAR_FECI2C_PAR_SCL_UTXD2
1583 | MCF_GPIO_PAR_FECI2C_PAR_SDA_URXD2;
1584 }
1585 #elif defined(CONFIG_M532x)
1586 volatile unsigned char *uartp;
1587 uartp = info->addr;
1588 switch (info->line) {
1589 case 0:
1590 MCF_INTC0_ICR26 = 0x3;
1591 MCF_INTC0_CIMR = 26;
1592 /* GPIO initialization */
1593 MCF_GPIO_PAR_UART |= 0x000F;
1594 break;
1595 case 1:
1596 MCF_INTC0_ICR27 = 0x3;
1597 MCF_INTC0_CIMR = 27;
1598 /* GPIO initialization */
1599 MCF_GPIO_PAR_UART |= 0x0FF0;
1600 break;
1601 case 2:
1602 MCF_INTC0_ICR28 = 0x3;
1603 MCF_INTC0_CIMR = 28;
1604 /* GPIOs also must be initalized, depends on board */
1605 break;
1606 }
1607 #else
1608 volatile unsigned char *icrp, *uartp;
1609
1610 switch (info->line) {
1611 case 0:
1612 icrp = (volatile unsigned char *) (MCF_MBAR + MCFSIM_UART1ICR);
1613 *icrp = /*MCFSIM_ICR_AUTOVEC |*/ MCFSIM_ICR_LEVEL6 |
1614 MCFSIM_ICR_PRI1;
1615 mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_UART1);
1616 break;
1617 case 1:
1618 icrp = (volatile unsigned char *) (MCF_MBAR + MCFSIM_UART2ICR);
1619 *icrp = /*MCFSIM_ICR_AUTOVEC |*/ MCFSIM_ICR_LEVEL6 |
1620 MCFSIM_ICR_PRI2;
1621 mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_UART2);
1622 break;
1623 default:
1624 printk("MCFRS: don't know how to handle UART %d interrupt?\n",
1625 info->line);
1626 return;
1627 }
1628
1629 uartp = info->addr;
1630 uartp[MCFUART_UIVR] = info->irq;
1631 #endif
1632
1633 /* Clear mask, so no surprise interrupts. */
1634 uartp[MCFUART_UIMR] = 0;
1635
1636 if (request_irq(info->irq, mcfrs_interrupt, IRQF_DISABLED,
1637 "ColdFire UART", NULL)) {
1638 printk("MCFRS: Unable to attach ColdFire UART %d interrupt "
1639 "vector=%d\n", info->line, info->irq);
1640 }
1641
1642 return;
1643 }
1644
1645
1646 char *mcfrs_drivername = "ColdFire internal UART serial driver version 1.00\n";
1647
1648
1649 /*
1650 * Serial stats reporting...
1651 */
1652 int mcfrs_readproc(char *page, char **start, off_t off, int count,
1653 int *eof, void *data)
1654 {
1655 struct mcf_serial *info;
1656 char str[20];
1657 int len, sigs, i;
1658
1659 len = sprintf(page, mcfrs_drivername);
1660 for (i = 0; (i < NR_PORTS); i++) {
1661 info = &mcfrs_table[i];
1662 len += sprintf((page + len), "%d: port:%x irq=%d baud:%d ",
1663 i, (unsigned int) info->addr, info->irq, info->baud);
1664 if (info->stats.rx || info->stats.tx)
1665 len += sprintf((page + len), "tx:%d rx:%d ",
1666 info->stats.tx, info->stats.rx);
1667 if (info->stats.rxframing)
1668 len += sprintf((page + len), "fe:%d ",
1669 info->stats.rxframing);
1670 if (info->stats.rxparity)
1671 len += sprintf((page + len), "pe:%d ",
1672 info->stats.rxparity);
1673 if (info->stats.rxbreak)
1674 len += sprintf((page + len), "brk:%d ",
1675 info->stats.rxbreak);
1676 if (info->stats.rxoverrun)
1677 len += sprintf((page + len), "oe:%d ",
1678 info->stats.rxoverrun);
1679
1680 str[0] = str[1] = 0;
1681 if ((sigs = mcfrs_getsignals(info))) {
1682 if (sigs & TIOCM_RTS)
1683 strcat(str, "|RTS");
1684 if (sigs & TIOCM_CTS)
1685 strcat(str, "|CTS");
1686 if (sigs & TIOCM_DTR)
1687 strcat(str, "|DTR");
1688 if (sigs & TIOCM_CD)
1689 strcat(str, "|CD");
1690 }
1691
1692 len += sprintf((page + len), "%s\n", &str[1]);
1693 }
1694
1695 return(len);
1696 }
1697
1698
1699 /* Finally, routines used to initialize the serial driver. */
1700
1701 static void show_serial_version(void)
1702 {
1703 printk(mcfrs_drivername);
1704 }
1705
1706 static const struct tty_operations mcfrs_ops = {
1707 .open = mcfrs_open,
1708 .close = mcfrs_close,
1709 .write = mcfrs_write,
1710 .flush_chars = mcfrs_flush_chars,
1711 .write_room = mcfrs_write_room,
1712 .chars_in_buffer = mcfrs_chars_in_buffer,
1713 .flush_buffer = mcfrs_flush_buffer,
1714 .ioctl = mcfrs_ioctl,
1715 .throttle = mcfrs_throttle,
1716 .unthrottle = mcfrs_unthrottle,
1717 .set_termios = mcfrs_set_termios,
1718 .stop = mcfrs_stop,
1719 .start = mcfrs_start,
1720 .hangup = mcfrs_hangup,
1721 .read_proc = mcfrs_readproc,
1722 .wait_until_sent = mcfrs_wait_until_sent,
1723 .tiocmget = mcfrs_tiocmget,
1724 .tiocmset = mcfrs_tiocmset,
1725 };
1726
1727 /* mcfrs_init inits the driver */
1728 static int __init
1729 mcfrs_init(void)
1730 {
1731 struct mcf_serial *info;
1732 unsigned long flags;
1733 int i;
1734
1735 /* Setup base handler, and timer table. */
1736 #ifdef MCFPP_DCD0
1737 init_timer(&mcfrs_timer_struct);
1738 mcfrs_timer_struct.function = mcfrs_timer;
1739 mcfrs_timer_struct.data = 0;
1740 mcfrs_timer_struct.expires = jiffies + HZ/25;
1741 add_timer(&mcfrs_timer_struct);
1742 mcfrs_ppstatus = mcf_getppdata() & (MCFPP_DCD0 | MCFPP_DCD1);
1743 #endif
1744 mcfrs_serial_driver = alloc_tty_driver(NR_PORTS);
1745 if (!mcfrs_serial_driver)
1746 return -ENOMEM;
1747
1748 show_serial_version();
1749
1750 /* Initialize the tty_driver structure */
1751 mcfrs_serial_driver->owner = THIS_MODULE;
1752 mcfrs_serial_driver->name = "ttyS";
1753 mcfrs_serial_driver->driver_name = "mcfserial";
1754 mcfrs_serial_driver->major = TTY_MAJOR;
1755 mcfrs_serial_driver->minor_start = 64;
1756 mcfrs_serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1757 mcfrs_serial_driver->subtype = SERIAL_TYPE_NORMAL;
1758 mcfrs_serial_driver->init_termios = tty_std_termios;
1759
1760 mcfrs_serial_driver->init_termios.c_cflag =
1761 mcfrs_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1762 mcfrs_serial_driver->flags = TTY_DRIVER_REAL_RAW;
1763
1764 tty_set_operations(mcfrs_serial_driver, &mcfrs_ops);
1765
1766 if (tty_register_driver(mcfrs_serial_driver)) {
1767 printk("MCFRS: Couldn't register serial driver\n");
1768 put_tty_driver(mcfrs_serial_driver);
1769 return(-EBUSY);
1770 }
1771
1772 local_irq_save(flags);
1773
1774 /*
1775 * Configure all the attached serial ports.
1776 */
1777 for (i = 0, info = mcfrs_table; (i < NR_PORTS); i++, info++) {
1778 info->magic = SERIAL_MAGIC;
1779 info->line = i;
1780 info->tty = 0;
1781 info->custom_divisor = 16;
1782 info->close_delay = 50;
1783 info->closing_wait = 3000;
1784 info->x_char = 0;
1785 info->event = 0;
1786 info->count = 0;
1787 info->blocked_open = 0;
1788 INIT_WORK(&info->tqueue, mcfrs_offintr);
1789 INIT_WORK(&info->tqueue_hangup, do_serial_hangup);
1790 init_waitqueue_head(&info->open_wait);
1791 init_waitqueue_head(&info->close_wait);
1792
1793 info->imr = 0;
1794 mcfrs_setsignals(info, 0, 0);
1795 mcfrs_irqinit(info);
1796
1797 printk("ttyS%d at 0x%04x (irq = %d)", info->line,
1798 (unsigned int) info->addr, info->irq);
1799 printk(" is a builtin ColdFire UART\n");
1800 }
1801
1802 local_irq_restore(flags);
1803 return 0;
1804 }
1805
1806 module_init(mcfrs_init);
1807
1808 /****************************************************************************/
1809 /* Serial Console */
1810 /****************************************************************************/
1811
1812 /*
1813 * Quick and dirty UART initialization, for console output.
1814 */
1815
1816 void mcfrs_init_console(void)
1817 {
1818 volatile unsigned char *uartp;
1819 unsigned int clk;
1820
1821 /*
1822 * Reset UART, get it into known state...
1823 */
1824 uartp = (volatile unsigned char *) (MCF_MBAR +
1825 (mcfrs_console_port ? MCFUART_BASE2 : MCFUART_BASE1));
1826
1827 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
1828 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
1829 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETMRPTR; /* reset MR pointer */
1830
1831 /*
1832 * Set port for defined baud , 8 data bits, 1 stop bit, no parity.
1833 */
1834 uartp[MCFUART_UMR] = MCFUART_MR1_PARITYNONE | MCFUART_MR1_CS8;
1835 uartp[MCFUART_UMR] = MCFUART_MR2_STOP1;
1836
1837 #ifdef CONFIG_M5272
1838 {
1839 /*
1840 * For the MCF5272, also compute the baudrate fraction.
1841 */
1842 int fraction = MCF_BUSCLK - (clk * 32 * mcfrs_console_baud);
1843 fraction *= 16;
1844 fraction /= (32 * mcfrs_console_baud);
1845 uartp[MCFUART_UFPD] = (fraction & 0xf); /* set fraction */
1846 clk = (MCF_BUSCLK / mcfrs_console_baud) / 32;
1847 }
1848 #else
1849 clk = ((MCF_BUSCLK / mcfrs_console_baud) + 16) / 32; /* set baud */
1850 #endif
1851
1852 uartp[MCFUART_UBG1] = (clk & 0xff00) >> 8; /* set msb baud */
1853 uartp[MCFUART_UBG2] = (clk & 0xff); /* set lsb baud */
1854 uartp[MCFUART_UCSR] = MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER;
1855 uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
1856
1857 mcfrs_console_inited++;
1858 return;
1859 }
1860
1861
1862 /*
1863 * Setup for console. Argument comes from the boot command line.
1864 */
1865
1866 int mcfrs_console_setup(struct console *cp, char *arg)
1867 {
1868 int i, n = CONSOLE_BAUD_RATE;
1869
1870 if (!cp)
1871 return(-1);
1872
1873 if (!strncmp(cp->name, "ttyS", 4))
1874 mcfrs_console_port = cp->index;
1875 else if (!strncmp(cp->name, "cua", 3))
1876 mcfrs_console_port = cp->index;
1877 else
1878 return(-1);
1879
1880 if (arg)
1881 n = simple_strtoul(arg,NULL,0);
1882 for (i = 0; i < MCFRS_BAUD_TABLE_SIZE; i++)
1883 if (mcfrs_baud_table[i] == n)
1884 break;
1885 if (i < MCFRS_BAUD_TABLE_SIZE) {
1886 mcfrs_console_baud = n;
1887 mcfrs_console_cbaud = 0;
1888 if (i > 15) {
1889 mcfrs_console_cbaud |= CBAUDEX;
1890 i -= 15;
1891 }
1892 mcfrs_console_cbaud |= i;
1893 }
1894 mcfrs_init_console(); /* make sure baud rate changes */
1895 return(0);
1896 }
1897
1898
1899 static struct tty_driver *mcfrs_console_device(struct console *c, int *index)
1900 {
1901 *index = c->index;
1902 return mcfrs_serial_driver;
1903 }
1904
1905
1906 /*
1907 * Output a single character, using UART polled mode.
1908 * This is used for console output.
1909 */
1910
1911 void mcfrs_put_char(char ch)
1912 {
1913 volatile unsigned char *uartp;
1914 unsigned long flags;
1915 int i;
1916
1917 uartp = (volatile unsigned char *) (MCF_MBAR +
1918 (mcfrs_console_port ? MCFUART_BASE2 : MCFUART_BASE1));
1919
1920 local_irq_save(flags);
1921 for (i = 0; (i < 0x10000); i++) {
1922 if (uartp[MCFUART_USR] & MCFUART_USR_TXREADY)
1923 break;
1924 }
1925 if (i < 0x10000) {
1926 uartp[MCFUART_UTB] = ch;
1927 for (i = 0; (i < 0x10000); i++)
1928 if (uartp[MCFUART_USR] & MCFUART_USR_TXEMPTY)
1929 break;
1930 }
1931 if (i >= 0x10000)
1932 mcfrs_init_console(); /* try and get it back */
1933 local_irq_restore(flags);
1934
1935 return;
1936 }
1937
1938
1939 /*
1940 * rs_console_write is registered for printk output.
1941 */
1942
1943 void mcfrs_console_write(struct console *cp, const char *p, unsigned len)
1944 {
1945 if (!mcfrs_console_inited)
1946 mcfrs_init_console();
1947 while (len-- > 0) {
1948 if (*p == '\n')
1949 mcfrs_put_char('\r');
1950 mcfrs_put_char(*p++);
1951 }
1952 }
1953
1954 /*
1955 * declare our consoles
1956 */
1957
1958 struct console mcfrs_console = {
1959 .name = "ttyS",
1960 .write = mcfrs_console_write,
1961 .device = mcfrs_console_device,
1962 .setup = mcfrs_console_setup,
1963 .flags = CON_PRINTBUFFER,
1964 .index = -1,
1965 };
1966
1967 static int __init mcfrs_console_init(void)
1968 {
1969 register_console(&mcfrs_console);
1970 return 0;
1971 }
1972
1973 console_initcall(mcfrs_console_init);
1974
1975 /****************************************************************************/
mah project overlay