Commit | Line | Data |
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1da177e4 LT |
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/segment.h> | |
44 | #include <asm/semaphore.h> | |
45 | #include <asm/delay.h> | |
46 | #include <asm/coldfire.h> | |
47 | #include <asm/mcfsim.h> | |
48 | #include <asm/mcfuart.h> | |
49 | #include <asm/nettel.h> | |
50 | #include <asm/uaccess.h> | |
51 | #include "mcfserial.h" | |
52 | ||
53 | struct timer_list mcfrs_timer_struct; | |
54 | ||
55 | /* | |
56 | * Default console baud rate, we use this as the default | |
57 | * for all ports so init can just open /dev/console and | |
58 | * keep going. Perhaps one day the cflag settings for the | |
59 | * console can be used instead. | |
60 | */ | |
61 | #if defined(CONFIG_ARNEWSH) || defined(CONFIG_MOTOROLA) || 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 | #ifndef CONSOLE_BAUD_RATE | |
72 | #define CONSOLE_BAUD_RATE 9600 | |
73 | #define DEFAULT_CBAUD B9600 | |
74 | #endif | |
75 | ||
76 | int mcfrs_console_inited = 0; | |
77 | int mcfrs_console_port = -1; | |
78 | int mcfrs_console_baud = CONSOLE_BAUD_RATE; | |
79 | int mcfrs_console_cbaud = DEFAULT_CBAUD; | |
80 | ||
81 | /* | |
82 | * Driver data structures. | |
83 | */ | |
84 | static struct tty_driver *mcfrs_serial_driver; | |
85 | ||
86 | /* number of characters left in xmit buffer before we ask for more */ | |
87 | #define WAKEUP_CHARS 256 | |
88 | ||
89 | /* Debugging... | |
90 | */ | |
91 | #undef SERIAL_DEBUG_OPEN | |
92 | #undef SERIAL_DEBUG_FLOW | |
93 | ||
94 | #if defined(CONFIG_M527x) || defined(CONFIG_M528x) | |
95 | #define IRQBASE (MCFINT_VECBASE+MCFINT_UART0) | |
96 | #else | |
97 | #define IRQBASE 73 | |
98 | #endif | |
99 | ||
100 | /* | |
101 | * Configuration table, UARTs to look for at startup. | |
102 | */ | |
103 | static struct mcf_serial mcfrs_table[] = { | |
104 | { /* ttyS0 */ | |
105 | .magic = 0, | |
106 | .addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE1), | |
107 | .irq = IRQBASE, | |
108 | .flags = ASYNC_BOOT_AUTOCONF, | |
109 | }, | |
110 | { /* ttyS1 */ | |
111 | .magic = 0, | |
112 | .addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE2), | |
113 | .irq = IRQBASE+1, | |
114 | .flags = ASYNC_BOOT_AUTOCONF, | |
115 | }, | |
116 | }; | |
117 | ||
118 | ||
119 | #define NR_PORTS (sizeof(mcfrs_table) / sizeof(struct mcf_serial)) | |
120 | ||
121 | /* | |
122 | * This is used to figure out the divisor speeds and the timeouts. | |
123 | */ | |
124 | static int mcfrs_baud_table[] = { | |
125 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, | |
126 | 9600, 19200, 38400, 57600, 115200, 230400, 460800, 0 | |
127 | }; | |
128 | #define MCFRS_BAUD_TABLE_SIZE \ | |
129 | (sizeof(mcfrs_baud_table)/sizeof(mcfrs_baud_table[0])) | |
130 | ||
131 | ||
132 | #ifdef CONFIG_MAGIC_SYSRQ | |
133 | /* | |
134 | * Magic system request keys. Used for debugging... | |
135 | */ | |
136 | extern int magic_sysrq_key(int ch); | |
137 | #endif | |
138 | ||
139 | ||
140 | /* | |
141 | * Forware declarations... | |
142 | */ | |
143 | static void mcfrs_change_speed(struct mcf_serial *info); | |
144 | static void mcfrs_wait_until_sent(struct tty_struct *tty, int timeout); | |
145 | ||
146 | ||
147 | static inline int serial_paranoia_check(struct mcf_serial *info, | |
148 | char *name, const char *routine) | |
149 | { | |
150 | #ifdef SERIAL_PARANOIA_CHECK | |
151 | static const char badmagic[] = | |
152 | "MCFRS(warning): bad magic number for serial struct %s in %s\n"; | |
153 | static const char badinfo[] = | |
154 | "MCFRS(warning): null mcf_serial for %s in %s\n"; | |
155 | ||
156 | if (!info) { | |
157 | printk(badinfo, name, routine); | |
158 | return 1; | |
159 | } | |
160 | if (info->magic != SERIAL_MAGIC) { | |
161 | printk(badmagic, name, routine); | |
162 | return 1; | |
163 | } | |
164 | #endif | |
165 | return 0; | |
166 | } | |
167 | ||
168 | /* | |
169 | * Sets or clears DTR and RTS on the requested line. | |
170 | */ | |
171 | static void mcfrs_setsignals(struct mcf_serial *info, int dtr, int rts) | |
172 | { | |
173 | volatile unsigned char *uartp; | |
174 | unsigned long flags; | |
175 | ||
176 | #if 0 | |
177 | printk("%s(%d): mcfrs_setsignals(info=%x,dtr=%d,rts=%d)\n", | |
178 | __FILE__, __LINE__, info, dtr, rts); | |
179 | #endif | |
180 | ||
181 | local_irq_save(flags); | |
182 | if (dtr >= 0) { | |
183 | #ifdef MCFPP_DTR0 | |
184 | if (info->line) | |
185 | mcf_setppdata(MCFPP_DTR1, (dtr ? 0 : MCFPP_DTR1)); | |
186 | else | |
187 | mcf_setppdata(MCFPP_DTR0, (dtr ? 0 : MCFPP_DTR0)); | |
188 | #endif | |
189 | } | |
190 | if (rts >= 0) { | |
191 | uartp = info->addr; | |
192 | if (rts) { | |
193 | info->sigs |= TIOCM_RTS; | |
194 | uartp[MCFUART_UOP1] = MCFUART_UOP_RTS; | |
195 | } else { | |
196 | info->sigs &= ~TIOCM_RTS; | |
197 | uartp[MCFUART_UOP0] = MCFUART_UOP_RTS; | |
198 | } | |
199 | } | |
200 | local_irq_restore(flags); | |
201 | return; | |
202 | } | |
203 | ||
204 | /* | |
205 | * Gets values of serial signals. | |
206 | */ | |
207 | static int mcfrs_getsignals(struct mcf_serial *info) | |
208 | { | |
209 | volatile unsigned char *uartp; | |
210 | unsigned long flags; | |
211 | int sigs; | |
212 | #if defined(CONFIG_NETtel) && defined(CONFIG_M5307) | |
213 | unsigned short ppdata; | |
214 | #endif | |
215 | ||
216 | #if 0 | |
217 | printk("%s(%d): mcfrs_getsignals(info=%x)\n", __FILE__, __LINE__); | |
218 | #endif | |
219 | ||
220 | local_irq_save(flags); | |
221 | uartp = info->addr; | |
222 | sigs = (uartp[MCFUART_UIPR] & MCFUART_UIPR_CTS) ? 0 : TIOCM_CTS; | |
223 | sigs |= (info->sigs & TIOCM_RTS); | |
224 | ||
225 | #ifdef MCFPP_DCD0 | |
226 | { | |
227 | unsigned int ppdata; | |
228 | ppdata = mcf_getppdata(); | |
229 | if (info->line == 0) { | |
230 | sigs |= (ppdata & MCFPP_DCD0) ? 0 : TIOCM_CD; | |
231 | sigs |= (ppdata & MCFPP_DTR0) ? 0 : TIOCM_DTR; | |
232 | } else if (info->line == 1) { | |
233 | sigs |= (ppdata & MCFPP_DCD1) ? 0 : TIOCM_CD; | |
234 | sigs |= (ppdata & MCFPP_DTR1) ? 0 : TIOCM_DTR; | |
235 | } | |
236 | } | |
237 | #endif | |
238 | ||
239 | local_irq_restore(flags); | |
240 | return(sigs); | |
241 | } | |
242 | ||
243 | /* | |
244 | * ------------------------------------------------------------ | |
245 | * mcfrs_stop() and mcfrs_start() | |
246 | * | |
247 | * This routines are called before setting or resetting tty->stopped. | |
248 | * They enable or disable transmitter interrupts, as necessary. | |
249 | * ------------------------------------------------------------ | |
250 | */ | |
251 | static void mcfrs_stop(struct tty_struct *tty) | |
252 | { | |
253 | volatile unsigned char *uartp; | |
254 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
255 | unsigned long flags; | |
256 | ||
257 | if (serial_paranoia_check(info, tty->name, "mcfrs_stop")) | |
258 | return; | |
259 | ||
260 | local_irq_save(flags); | |
261 | uartp = info->addr; | |
262 | info->imr &= ~MCFUART_UIR_TXREADY; | |
263 | uartp[MCFUART_UIMR] = info->imr; | |
264 | local_irq_restore(flags); | |
265 | } | |
266 | ||
267 | static void mcfrs_start(struct tty_struct *tty) | |
268 | { | |
269 | volatile unsigned char *uartp; | |
270 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
271 | unsigned long flags; | |
272 | ||
273 | if (serial_paranoia_check(info, tty->name, "mcfrs_start")) | |
274 | return; | |
275 | ||
276 | local_irq_save(flags); | |
277 | if (info->xmit_cnt && info->xmit_buf) { | |
278 | uartp = info->addr; | |
279 | info->imr |= MCFUART_UIR_TXREADY; | |
280 | uartp[MCFUART_UIMR] = info->imr; | |
281 | } | |
282 | local_irq_restore(flags); | |
283 | } | |
284 | ||
285 | /* | |
286 | * ---------------------------------------------------------------------- | |
287 | * | |
288 | * Here starts the interrupt handling routines. All of the following | |
289 | * subroutines are declared as inline and are folded into | |
290 | * mcfrs_interrupt(). They were separated out for readability's sake. | |
291 | * | |
292 | * Note: mcfrs_interrupt() is a "fast" interrupt, which means that it | |
293 | * runs with interrupts turned off. People who may want to modify | |
294 | * mcfrs_interrupt() should try to keep the interrupt handler as fast as | |
295 | * possible. After you are done making modifications, it is not a bad | |
296 | * idea to do: | |
297 | * | |
298 | * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c | |
299 | * | |
300 | * and look at the resulting assemble code in serial.s. | |
301 | * | |
302 | * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 | |
303 | * ----------------------------------------------------------------------- | |
304 | */ | |
305 | ||
306 | static inline void receive_chars(struct mcf_serial *info) | |
307 | { | |
308 | volatile unsigned char *uartp; | |
309 | struct tty_struct *tty = info->tty; | |
310 | unsigned char status, ch; | |
311 | ||
312 | if (!tty) | |
313 | return; | |
314 | ||
315 | uartp = info->addr; | |
316 | ||
317 | while ((status = uartp[MCFUART_USR]) & MCFUART_USR_RXREADY) { | |
318 | ||
319 | if (tty->flip.count >= TTY_FLIPBUF_SIZE) | |
320 | break; | |
321 | ||
322 | ch = uartp[MCFUART_URB]; | |
323 | info->stats.rx++; | |
324 | ||
325 | #ifdef CONFIG_MAGIC_SYSRQ | |
326 | if (mcfrs_console_inited && (info->line == mcfrs_console_port)) { | |
327 | if (magic_sysrq_key(ch)) | |
328 | continue; | |
329 | } | |
330 | #endif | |
331 | ||
332 | tty->flip.count++; | |
333 | if (status & MCFUART_USR_RXERR) { | |
334 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETERR; | |
335 | if (status & MCFUART_USR_RXBREAK) { | |
336 | info->stats.rxbreak++; | |
337 | *tty->flip.flag_buf_ptr++ = TTY_BREAK; | |
338 | } else if (status & MCFUART_USR_RXPARITY) { | |
339 | info->stats.rxparity++; | |
340 | *tty->flip.flag_buf_ptr++ = TTY_PARITY; | |
341 | } else if (status & MCFUART_USR_RXOVERRUN) { | |
342 | info->stats.rxoverrun++; | |
343 | *tty->flip.flag_buf_ptr++ = TTY_OVERRUN; | |
344 | } else if (status & MCFUART_USR_RXFRAMING) { | |
345 | info->stats.rxframing++; | |
346 | *tty->flip.flag_buf_ptr++ = TTY_FRAME; | |
347 | } else { | |
348 | /* This should never happen... */ | |
349 | *tty->flip.flag_buf_ptr++ = 0; | |
350 | } | |
351 | } else { | |
352 | *tty->flip.flag_buf_ptr++ = 0; | |
353 | } | |
354 | *tty->flip.char_buf_ptr++ = ch; | |
355 | } | |
356 | ||
357 | schedule_work(&tty->flip.work); | |
358 | return; | |
359 | } | |
360 | ||
361 | static inline void transmit_chars(struct mcf_serial *info) | |
362 | { | |
363 | volatile unsigned char *uartp; | |
364 | ||
365 | uartp = info->addr; | |
366 | ||
367 | if (info->x_char) { | |
368 | /* Send special char - probably flow control */ | |
369 | uartp[MCFUART_UTB] = info->x_char; | |
370 | info->x_char = 0; | |
371 | info->stats.tx++; | |
372 | } | |
373 | ||
374 | if ((info->xmit_cnt <= 0) || info->tty->stopped) { | |
375 | info->imr &= ~MCFUART_UIR_TXREADY; | |
376 | uartp[MCFUART_UIMR] = info->imr; | |
377 | return; | |
378 | } | |
379 | ||
380 | while (uartp[MCFUART_USR] & MCFUART_USR_TXREADY) { | |
381 | uartp[MCFUART_UTB] = info->xmit_buf[info->xmit_tail++]; | |
382 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
383 | info->stats.tx++; | |
384 | if (--info->xmit_cnt <= 0) | |
385 | break; | |
386 | } | |
387 | ||
388 | if (info->xmit_cnt < WAKEUP_CHARS) | |
389 | schedule_work(&info->tqueue); | |
390 | return; | |
391 | } | |
392 | ||
393 | /* | |
394 | * This is the serial driver's generic interrupt routine | |
395 | */ | |
396 | irqreturn_t mcfrs_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
397 | { | |
398 | struct mcf_serial *info; | |
399 | unsigned char isr; | |
400 | ||
401 | info = &mcfrs_table[(irq - IRQBASE)]; | |
402 | isr = info->addr[MCFUART_UISR] & info->imr; | |
403 | ||
404 | if (isr & MCFUART_UIR_RXREADY) | |
405 | receive_chars(info); | |
406 | if (isr & MCFUART_UIR_TXREADY) | |
407 | transmit_chars(info); | |
408 | return IRQ_HANDLED; | |
409 | } | |
410 | ||
411 | /* | |
412 | * ------------------------------------------------------------------- | |
413 | * Here ends the serial interrupt routines. | |
414 | * ------------------------------------------------------------------- | |
415 | */ | |
416 | ||
417 | static void mcfrs_offintr(void *private) | |
418 | { | |
419 | struct mcf_serial *info = (struct mcf_serial *) private; | |
420 | struct tty_struct *tty; | |
421 | ||
422 | tty = info->tty; | |
423 | if (!tty) | |
424 | return; | |
425 | tty_wakeup(tty); | |
426 | } | |
427 | ||
428 | ||
429 | /* | |
430 | * Change of state on a DCD line. | |
431 | */ | |
432 | void mcfrs_modem_change(struct mcf_serial *info, int dcd) | |
433 | { | |
434 | if (info->count == 0) | |
435 | return; | |
436 | ||
437 | if (info->flags & ASYNC_CHECK_CD) { | |
438 | if (dcd) | |
439 | wake_up_interruptible(&info->open_wait); | |
440 | else | |
441 | schedule_work(&info->tqueue_hangup); | |
442 | } | |
443 | } | |
444 | ||
445 | ||
446 | #ifdef MCFPP_DCD0 | |
447 | ||
448 | unsigned short mcfrs_ppstatus; | |
449 | ||
450 | /* | |
451 | * This subroutine is called when the RS_TIMER goes off. It is used | |
452 | * to monitor the state of the DCD lines - since they have no edge | |
453 | * sensors and interrupt generators. | |
454 | */ | |
455 | static void mcfrs_timer(void) | |
456 | { | |
457 | unsigned int ppstatus, dcdval, i; | |
458 | ||
459 | ppstatus = mcf_getppdata() & (MCFPP_DCD0 | MCFPP_DCD1); | |
460 | ||
461 | if (ppstatus != mcfrs_ppstatus) { | |
462 | for (i = 0; (i < 2); i++) { | |
463 | dcdval = (i ? MCFPP_DCD1 : MCFPP_DCD0); | |
464 | if ((ppstatus & dcdval) != (mcfrs_ppstatus & dcdval)) { | |
465 | mcfrs_modem_change(&mcfrs_table[i], | |
466 | ((ppstatus & dcdval) ? 0 : 1)); | |
467 | } | |
468 | } | |
469 | } | |
470 | mcfrs_ppstatus = ppstatus; | |
471 | ||
472 | /* Re-arm timer */ | |
473 | mcfrs_timer_struct.expires = jiffies + HZ/25; | |
474 | add_timer(&mcfrs_timer_struct); | |
475 | } | |
476 | ||
477 | #endif /* MCFPP_DCD0 */ | |
478 | ||
479 | ||
480 | /* | |
481 | * This routine is called from the scheduler tqueue when the interrupt | |
482 | * routine has signalled that a hangup has occurred. The path of | |
483 | * hangup processing is: | |
484 | * | |
485 | * serial interrupt routine -> (scheduler tqueue) -> | |
486 | * do_serial_hangup() -> tty->hangup() -> mcfrs_hangup() | |
487 | * | |
488 | */ | |
489 | static void do_serial_hangup(void *private) | |
490 | { | |
491 | struct mcf_serial *info = (struct mcf_serial *) private; | |
492 | struct tty_struct *tty; | |
493 | ||
494 | tty = info->tty; | |
495 | if (!tty) | |
496 | return; | |
497 | ||
498 | tty_hangup(tty); | |
499 | } | |
500 | ||
501 | static int startup(struct mcf_serial * info) | |
502 | { | |
503 | volatile unsigned char *uartp; | |
504 | unsigned long flags; | |
505 | ||
506 | if (info->flags & ASYNC_INITIALIZED) | |
507 | return 0; | |
508 | ||
509 | if (!info->xmit_buf) { | |
510 | info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL); | |
511 | if (!info->xmit_buf) | |
512 | return -ENOMEM; | |
513 | } | |
514 | ||
515 | local_irq_save(flags); | |
516 | ||
517 | #ifdef SERIAL_DEBUG_OPEN | |
518 | printk("starting up ttyS%d (irq %d)...\n", info->line, info->irq); | |
519 | #endif | |
520 | ||
521 | /* | |
522 | * Reset UART, get it into known state... | |
523 | */ | |
524 | uartp = info->addr; | |
525 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */ | |
526 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */ | |
527 | mcfrs_setsignals(info, 1, 1); | |
528 | ||
529 | if (info->tty) | |
530 | clear_bit(TTY_IO_ERROR, &info->tty->flags); | |
531 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; | |
532 | ||
533 | /* | |
534 | * and set the speed of the serial port | |
535 | */ | |
536 | mcfrs_change_speed(info); | |
537 | ||
538 | /* | |
539 | * Lastly enable the UART transmitter and receiver, and | |
540 | * interrupt enables. | |
541 | */ | |
542 | info->imr = MCFUART_UIR_RXREADY; | |
543 | uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE; | |
544 | uartp[MCFUART_UIMR] = info->imr; | |
545 | ||
546 | info->flags |= ASYNC_INITIALIZED; | |
547 | local_irq_restore(flags); | |
548 | return 0; | |
549 | } | |
550 | ||
551 | /* | |
552 | * This routine will shutdown a serial port; interrupts are disabled, and | |
553 | * DTR is dropped if the hangup on close termio flag is on. | |
554 | */ | |
555 | static void shutdown(struct mcf_serial * info) | |
556 | { | |
557 | volatile unsigned char *uartp; | |
558 | unsigned long flags; | |
559 | ||
560 | if (!(info->flags & ASYNC_INITIALIZED)) | |
561 | return; | |
562 | ||
563 | #ifdef SERIAL_DEBUG_OPEN | |
564 | printk("Shutting down serial port %d (irq %d)....\n", info->line, | |
565 | info->irq); | |
566 | #endif | |
567 | ||
568 | local_irq_save(flags); | |
569 | ||
570 | uartp = info->addr; | |
571 | uartp[MCFUART_UIMR] = 0; /* mask all interrupts */ | |
572 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */ | |
573 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */ | |
574 | ||
575 | if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) | |
576 | mcfrs_setsignals(info, 0, 0); | |
577 | ||
578 | if (info->xmit_buf) { | |
579 | free_page((unsigned long) info->xmit_buf); | |
580 | info->xmit_buf = 0; | |
581 | } | |
582 | ||
583 | if (info->tty) | |
584 | set_bit(TTY_IO_ERROR, &info->tty->flags); | |
585 | ||
586 | info->flags &= ~ASYNC_INITIALIZED; | |
587 | local_irq_restore(flags); | |
588 | } | |
589 | ||
590 | ||
591 | /* | |
592 | * This routine is called to set the UART divisor registers to match | |
593 | * the specified baud rate for a serial port. | |
594 | */ | |
595 | static void mcfrs_change_speed(struct mcf_serial *info) | |
596 | { | |
597 | volatile unsigned char *uartp; | |
598 | unsigned int baudclk, cflag; | |
599 | unsigned long flags; | |
600 | unsigned char mr1, mr2; | |
601 | int i; | |
602 | #ifdef CONFIG_M5272 | |
603 | unsigned int fraction; | |
604 | #endif | |
605 | ||
606 | if (!info->tty || !info->tty->termios) | |
607 | return; | |
608 | cflag = info->tty->termios->c_cflag; | |
609 | if (info->addr == 0) | |
610 | return; | |
611 | ||
612 | #if 0 | |
613 | printk("%s(%d): mcfrs_change_speed()\n", __FILE__, __LINE__); | |
614 | #endif | |
615 | ||
616 | i = cflag & CBAUD; | |
617 | if (i & CBAUDEX) { | |
618 | i &= ~CBAUDEX; | |
619 | if (i < 1 || i > 4) | |
620 | info->tty->termios->c_cflag &= ~CBAUDEX; | |
621 | else | |
622 | i += 15; | |
623 | } | |
624 | if (i == 0) { | |
625 | mcfrs_setsignals(info, 0, -1); | |
626 | return; | |
627 | } | |
628 | ||
629 | /* compute the baudrate clock */ | |
630 | #ifdef CONFIG_M5272 | |
631 | /* | |
632 | * For the MCF5272, also compute the baudrate fraction. | |
633 | */ | |
634 | baudclk = (MCF_BUSCLK / mcfrs_baud_table[i]) / 32; | |
635 | fraction = MCF_BUSCLK - (baudclk * 32 * mcfrs_baud_table[i]); | |
636 | fraction *= 16; | |
637 | fraction /= (32 * mcfrs_baud_table[i]); | |
638 | #else | |
639 | baudclk = ((MCF_BUSCLK / mcfrs_baud_table[i]) + 16) / 32; | |
640 | #endif | |
641 | ||
642 | info->baud = mcfrs_baud_table[i]; | |
643 | ||
644 | mr1 = MCFUART_MR1_RXIRQRDY | MCFUART_MR1_RXERRCHAR; | |
645 | mr2 = 0; | |
646 | ||
647 | switch (cflag & CSIZE) { | |
648 | case CS5: mr1 |= MCFUART_MR1_CS5; break; | |
649 | case CS6: mr1 |= MCFUART_MR1_CS6; break; | |
650 | case CS7: mr1 |= MCFUART_MR1_CS7; break; | |
651 | case CS8: | |
652 | default: mr1 |= MCFUART_MR1_CS8; break; | |
653 | } | |
654 | ||
655 | if (cflag & PARENB) { | |
656 | if (cflag & CMSPAR) { | |
657 | if (cflag & PARODD) | |
658 | mr1 |= MCFUART_MR1_PARITYMARK; | |
659 | else | |
660 | mr1 |= MCFUART_MR1_PARITYSPACE; | |
661 | } else { | |
662 | if (cflag & PARODD) | |
663 | mr1 |= MCFUART_MR1_PARITYODD; | |
664 | else | |
665 | mr1 |= MCFUART_MR1_PARITYEVEN; | |
666 | } | |
667 | } else { | |
668 | mr1 |= MCFUART_MR1_PARITYNONE; | |
669 | } | |
670 | ||
671 | if (cflag & CSTOPB) | |
672 | mr2 |= MCFUART_MR2_STOP2; | |
673 | else | |
674 | mr2 |= MCFUART_MR2_STOP1; | |
675 | ||
676 | if (cflag & CRTSCTS) { | |
677 | mr1 |= MCFUART_MR1_RXRTS; | |
678 | mr2 |= MCFUART_MR2_TXCTS; | |
679 | } | |
680 | ||
681 | if (cflag & CLOCAL) | |
682 | info->flags &= ~ASYNC_CHECK_CD; | |
683 | else | |
684 | info->flags |= ASYNC_CHECK_CD; | |
685 | ||
686 | uartp = info->addr; | |
687 | ||
688 | local_irq_save(flags); | |
689 | #if 0 | |
690 | printk("%s(%d): mr1=%x mr2=%x baudclk=%x\n", __FILE__, __LINE__, | |
691 | mr1, mr2, baudclk); | |
692 | #endif | |
693 | /* | |
694 | Note: pg 12-16 of MCF5206e User's Manual states that a | |
695 | software reset should be performed prior to changing | |
696 | UMR1,2, UCSR, UACR, bit 7 | |
697 | */ | |
698 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */ | |
699 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */ | |
700 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETMRPTR; /* reset MR pointer */ | |
701 | uartp[MCFUART_UMR] = mr1; | |
702 | uartp[MCFUART_UMR] = mr2; | |
703 | uartp[MCFUART_UBG1] = (baudclk & 0xff00) >> 8; /* set msb byte */ | |
704 | uartp[MCFUART_UBG2] = (baudclk & 0xff); /* set lsb byte */ | |
705 | #ifdef CONFIG_M5272 | |
706 | uartp[MCFUART_UFPD] = (fraction & 0xf); /* set fraction */ | |
707 | #endif | |
708 | uartp[MCFUART_UCSR] = MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER; | |
709 | uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE; | |
710 | mcfrs_setsignals(info, 1, -1); | |
711 | local_irq_restore(flags); | |
712 | return; | |
713 | } | |
714 | ||
715 | static void mcfrs_flush_chars(struct tty_struct *tty) | |
716 | { | |
717 | volatile unsigned char *uartp; | |
718 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
719 | unsigned long flags; | |
720 | ||
721 | if (serial_paranoia_check(info, tty->name, "mcfrs_flush_chars")) | |
722 | return; | |
723 | ||
724 | uartp = (volatile unsigned char *) info->addr; | |
725 | ||
726 | /* | |
727 | * re-enable receiver interrupt | |
728 | */ | |
729 | local_irq_save(flags); | |
730 | if ((!(info->imr & MCFUART_UIR_RXREADY)) && | |
731 | (info->flags & ASYNC_INITIALIZED) ) { | |
732 | info->imr |= MCFUART_UIR_RXREADY; | |
733 | uartp[MCFUART_UIMR] = info->imr; | |
734 | } | |
735 | local_irq_restore(flags); | |
736 | ||
737 | if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || | |
738 | !info->xmit_buf) | |
739 | return; | |
740 | ||
741 | /* Enable transmitter */ | |
742 | local_irq_save(flags); | |
743 | info->imr |= MCFUART_UIR_TXREADY; | |
744 | uartp[MCFUART_UIMR] = info->imr; | |
745 | local_irq_restore(flags); | |
746 | } | |
747 | ||
748 | static int mcfrs_write(struct tty_struct * tty, | |
749 | const unsigned char *buf, int count) | |
750 | { | |
751 | volatile unsigned char *uartp; | |
752 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
753 | unsigned long flags; | |
754 | int c, total = 0; | |
755 | ||
756 | #if 0 | |
757 | printk("%s(%d): mcfrs_write(tty=%x,buf=%x,count=%d)\n", | |
758 | __FILE__, __LINE__, (int)tty, (int)buf, count); | |
759 | #endif | |
760 | ||
761 | if (serial_paranoia_check(info, tty->name, "mcfrs_write")) | |
762 | return 0; | |
763 | ||
764 | if (!tty || !info->xmit_buf) | |
765 | return 0; | |
766 | ||
767 | local_save_flags(flags); | |
768 | while (1) { | |
769 | local_irq_disable(); | |
770 | c = min(count, (int) min(((int)SERIAL_XMIT_SIZE) - info->xmit_cnt - 1, | |
771 | ((int)SERIAL_XMIT_SIZE) - info->xmit_head)); | |
772 | local_irq_restore(flags); | |
773 | ||
774 | if (c <= 0) | |
775 | break; | |
776 | ||
777 | memcpy(info->xmit_buf + info->xmit_head, buf, c); | |
778 | ||
779 | local_irq_disable(); | |
780 | info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); | |
781 | info->xmit_cnt += c; | |
782 | local_irq_restore(flags); | |
783 | ||
784 | buf += c; | |
785 | count -= c; | |
786 | total += c; | |
787 | } | |
788 | ||
789 | local_irq_disable(); | |
790 | uartp = info->addr; | |
791 | info->imr |= MCFUART_UIR_TXREADY; | |
792 | uartp[MCFUART_UIMR] = info->imr; | |
793 | local_irq_restore(flags); | |
794 | ||
795 | return total; | |
796 | } | |
797 | ||
798 | static int mcfrs_write_room(struct tty_struct *tty) | |
799 | { | |
800 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
801 | int ret; | |
802 | ||
803 | if (serial_paranoia_check(info, tty->name, "mcfrs_write_room")) | |
804 | return 0; | |
805 | ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; | |
806 | if (ret < 0) | |
807 | ret = 0; | |
808 | return ret; | |
809 | } | |
810 | ||
811 | static int mcfrs_chars_in_buffer(struct tty_struct *tty) | |
812 | { | |
813 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
814 | ||
815 | if (serial_paranoia_check(info, tty->name, "mcfrs_chars_in_buffer")) | |
816 | return 0; | |
817 | return info->xmit_cnt; | |
818 | } | |
819 | ||
820 | static void mcfrs_flush_buffer(struct tty_struct *tty) | |
821 | { | |
822 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
823 | unsigned long flags; | |
824 | ||
825 | if (serial_paranoia_check(info, tty->name, "mcfrs_flush_buffer")) | |
826 | return; | |
827 | ||
828 | local_irq_save(flags); | |
829 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; | |
830 | local_irq_restore(flags); | |
831 | ||
832 | tty_wakeup(tty); | |
833 | } | |
834 | ||
835 | /* | |
836 | * ------------------------------------------------------------ | |
837 | * mcfrs_throttle() | |
838 | * | |
839 | * This routine is called by the upper-layer tty layer to signal that | |
840 | * incoming characters should be throttled. | |
841 | * ------------------------------------------------------------ | |
842 | */ | |
843 | static void mcfrs_throttle(struct tty_struct * tty) | |
844 | { | |
845 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
846 | #ifdef SERIAL_DEBUG_THROTTLE | |
847 | char buf[64]; | |
848 | ||
849 | printk("throttle %s: %d....\n", _tty_name(tty, buf), | |
850 | tty->ldisc.chars_in_buffer(tty)); | |
851 | #endif | |
852 | ||
853 | if (serial_paranoia_check(info, tty->name, "mcfrs_throttle")) | |
854 | return; | |
855 | ||
856 | if (I_IXOFF(tty)) | |
857 | info->x_char = STOP_CHAR(tty); | |
858 | ||
859 | /* Turn off RTS line (do this atomic) */ | |
860 | } | |
861 | ||
862 | static void mcfrs_unthrottle(struct tty_struct * tty) | |
863 | { | |
864 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
865 | #ifdef SERIAL_DEBUG_THROTTLE | |
866 | char buf[64]; | |
867 | ||
868 | printk("unthrottle %s: %d....\n", _tty_name(tty, buf), | |
869 | tty->ldisc.chars_in_buffer(tty)); | |
870 | #endif | |
871 | ||
872 | if (serial_paranoia_check(info, tty->name, "mcfrs_unthrottle")) | |
873 | return; | |
874 | ||
875 | if (I_IXOFF(tty)) { | |
876 | if (info->x_char) | |
877 | info->x_char = 0; | |
878 | else | |
879 | info->x_char = START_CHAR(tty); | |
880 | } | |
881 | ||
882 | /* Assert RTS line (do this atomic) */ | |
883 | } | |
884 | ||
885 | /* | |
886 | * ------------------------------------------------------------ | |
887 | * mcfrs_ioctl() and friends | |
888 | * ------------------------------------------------------------ | |
889 | */ | |
890 | ||
891 | static int get_serial_info(struct mcf_serial * info, | |
892 | struct serial_struct * retinfo) | |
893 | { | |
894 | struct serial_struct tmp; | |
895 | ||
896 | if (!retinfo) | |
897 | return -EFAULT; | |
898 | memset(&tmp, 0, sizeof(tmp)); | |
899 | tmp.type = info->type; | |
900 | tmp.line = info->line; | |
901 | tmp.port = (unsigned int) info->addr; | |
902 | tmp.irq = info->irq; | |
903 | tmp.flags = info->flags; | |
904 | tmp.baud_base = info->baud_base; | |
905 | tmp.close_delay = info->close_delay; | |
906 | tmp.closing_wait = info->closing_wait; | |
907 | tmp.custom_divisor = info->custom_divisor; | |
908 | return copy_to_user(retinfo,&tmp,sizeof(*retinfo)) ? -EFAULT : 0; | |
909 | } | |
910 | ||
911 | static int set_serial_info(struct mcf_serial * info, | |
912 | struct serial_struct * new_info) | |
913 | { | |
914 | struct serial_struct new_serial; | |
915 | struct mcf_serial old_info; | |
916 | int retval = 0; | |
917 | ||
918 | if (!new_info) | |
919 | return -EFAULT; | |
920 | if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) | |
921 | return -EFAULT; | |
922 | old_info = *info; | |
923 | ||
924 | if (!capable(CAP_SYS_ADMIN)) { | |
925 | if ((new_serial.baud_base != info->baud_base) || | |
926 | (new_serial.type != info->type) || | |
927 | (new_serial.close_delay != info->close_delay) || | |
928 | ((new_serial.flags & ~ASYNC_USR_MASK) != | |
929 | (info->flags & ~ASYNC_USR_MASK))) | |
930 | return -EPERM; | |
931 | info->flags = ((info->flags & ~ASYNC_USR_MASK) | | |
932 | (new_serial.flags & ASYNC_USR_MASK)); | |
933 | info->custom_divisor = new_serial.custom_divisor; | |
934 | goto check_and_exit; | |
935 | } | |
936 | ||
937 | if (info->count > 1) | |
938 | return -EBUSY; | |
939 | ||
940 | /* | |
941 | * OK, past this point, all the error checking has been done. | |
942 | * At this point, we start making changes..... | |
943 | */ | |
944 | ||
945 | info->baud_base = new_serial.baud_base; | |
946 | info->flags = ((info->flags & ~ASYNC_FLAGS) | | |
947 | (new_serial.flags & ASYNC_FLAGS)); | |
948 | info->type = new_serial.type; | |
949 | info->close_delay = new_serial.close_delay; | |
950 | info->closing_wait = new_serial.closing_wait; | |
951 | ||
952 | check_and_exit: | |
953 | retval = startup(info); | |
954 | return retval; | |
955 | } | |
956 | ||
957 | /* | |
958 | * get_lsr_info - get line status register info | |
959 | * | |
960 | * Purpose: Let user call ioctl() to get info when the UART physically | |
961 | * is emptied. On bus types like RS485, the transmitter must | |
962 | * release the bus after transmitting. This must be done when | |
963 | * the transmit shift register is empty, not be done when the | |
964 | * transmit holding register is empty. This functionality | |
965 | * allows an RS485 driver to be written in user space. | |
966 | */ | |
967 | static int get_lsr_info(struct mcf_serial * info, unsigned int *value) | |
968 | { | |
969 | volatile unsigned char *uartp; | |
970 | unsigned long flags; | |
971 | unsigned char status; | |
972 | ||
973 | local_irq_save(flags); | |
974 | uartp = info->addr; | |
975 | status = (uartp[MCFUART_USR] & MCFUART_USR_TXEMPTY) ? TIOCSER_TEMT : 0; | |
976 | local_irq_restore(flags); | |
977 | ||
978 | return put_user(status,value); | |
979 | } | |
980 | ||
981 | /* | |
982 | * This routine sends a break character out the serial port. | |
983 | */ | |
984 | static void send_break( struct mcf_serial * info, int duration) | |
985 | { | |
986 | volatile unsigned char *uartp; | |
987 | unsigned long flags; | |
988 | ||
989 | if (!info->addr) | |
990 | return; | |
991 | set_current_state(TASK_INTERRUPTIBLE); | |
992 | uartp = info->addr; | |
993 | ||
994 | local_irq_save(flags); | |
995 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDBREAKSTART; | |
996 | schedule_timeout(duration); | |
997 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDBREAKSTOP; | |
998 | local_irq_restore(flags); | |
999 | } | |
1000 | ||
1001 | static int mcfrs_tiocmget(struct tty_struct *tty, struct file *file) | |
1002 | { | |
1003 | struct mcf_serial * info = (struct mcf_serial *)tty->driver_data; | |
1004 | ||
1005 | if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl")) | |
1006 | return -ENODEV; | |
1007 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1008 | return -EIO; | |
1009 | ||
1010 | return mcfrs_getsignals(info); | |
1011 | } | |
1012 | ||
1013 | static int mcfrs_tiocmset(struct tty_struct *tty, struct file *file, | |
1014 | unsigned int set, unsigned int clear) | |
1015 | { | |
1016 | struct mcf_serial * info = (struct mcf_serial *)tty->driver_data; | |
1017 | int rts = -1, dtr = -1; | |
1018 | ||
1019 | if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl")) | |
1020 | return -ENODEV; | |
1021 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1022 | return -EIO; | |
1023 | ||
1024 | if (set & TIOCM_RTS) | |
1025 | rts = 1; | |
1026 | if (set & TIOCM_DTR) | |
1027 | dtr = 1; | |
1028 | if (clear & TIOCM_RTS) | |
1029 | rts = 0; | |
1030 | if (clear & TIOCM_DTR) | |
1031 | dtr = 0; | |
1032 | ||
1033 | mcfrs_setsignals(info, dtr, rts); | |
1034 | ||
1035 | return 0; | |
1036 | } | |
1037 | ||
1038 | static int mcfrs_ioctl(struct tty_struct *tty, struct file * file, | |
1039 | unsigned int cmd, unsigned long arg) | |
1040 | { | |
1041 | struct mcf_serial * info = (struct mcf_serial *)tty->driver_data; | |
1042 | int retval, error; | |
1043 | ||
1044 | if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl")) | |
1045 | return -ENODEV; | |
1046 | ||
1047 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
1048 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && | |
1049 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { | |
1050 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1051 | return -EIO; | |
1052 | } | |
1053 | ||
1054 | switch (cmd) { | |
1055 | case TCSBRK: /* SVID version: non-zero arg --> no break */ | |
1056 | retval = tty_check_change(tty); | |
1057 | if (retval) | |
1058 | return retval; | |
1059 | tty_wait_until_sent(tty, 0); | |
1060 | if (!arg) | |
1061 | send_break(info, HZ/4); /* 1/4 second */ | |
1062 | return 0; | |
1063 | case TCSBRKP: /* support for POSIX tcsendbreak() */ | |
1064 | retval = tty_check_change(tty); | |
1065 | if (retval) | |
1066 | return retval; | |
1067 | tty_wait_until_sent(tty, 0); | |
1068 | send_break(info, arg ? arg*(HZ/10) : HZ/4); | |
1069 | return 0; | |
1070 | case TIOCGSOFTCAR: | |
1071 | error = put_user(C_CLOCAL(tty) ? 1 : 0, | |
1072 | (unsigned long *) arg); | |
1073 | if (error) | |
1074 | return error; | |
1075 | return 0; | |
1076 | case TIOCSSOFTCAR: | |
1077 | get_user(arg, (unsigned long *) arg); | |
1078 | tty->termios->c_cflag = | |
1079 | ((tty->termios->c_cflag & ~CLOCAL) | | |
1080 | (arg ? CLOCAL : 0)); | |
1081 | return 0; | |
1082 | case TIOCGSERIAL: | |
1083 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
1084 | sizeof(struct serial_struct))) | |
1085 | return get_serial_info(info, | |
1086 | (struct serial_struct *) arg); | |
1087 | return -EFAULT; | |
1088 | case TIOCSSERIAL: | |
1089 | return set_serial_info(info, | |
1090 | (struct serial_struct *) arg); | |
1091 | case TIOCSERGETLSR: /* Get line status register */ | |
1092 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
1093 | sizeof(unsigned int))) | |
1094 | return get_lsr_info(info, (unsigned int *) arg); | |
1095 | return -EFAULT; | |
1096 | case TIOCSERGSTRUCT: | |
1097 | error = copy_to_user((struct mcf_serial *) arg, | |
1098 | info, sizeof(struct mcf_serial)); | |
1099 | if (error) | |
1100 | return -EFAULT; | |
1101 | return 0; | |
1102 | ||
1103 | #ifdef TIOCSET422 | |
1104 | case TIOCSET422: { | |
1105 | unsigned int val; | |
1106 | get_user(val, (unsigned int *) arg); | |
1107 | mcf_setpa(MCFPP_PA11, (val ? 0 : MCFPP_PA11)); | |
1108 | break; | |
1109 | } | |
1110 | case TIOCGET422: { | |
1111 | unsigned int val; | |
1112 | val = (mcf_getpa() & MCFPP_PA11) ? 0 : 1; | |
1113 | put_user(val, (unsigned int *) arg); | |
1114 | break; | |
1115 | } | |
1116 | #endif | |
1117 | ||
1118 | default: | |
1119 | return -ENOIOCTLCMD; | |
1120 | } | |
1121 | return 0; | |
1122 | } | |
1123 | ||
1124 | static void mcfrs_set_termios(struct tty_struct *tty, struct termios *old_termios) | |
1125 | { | |
1126 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
1127 | ||
1128 | if (tty->termios->c_cflag == old_termios->c_cflag) | |
1129 | return; | |
1130 | ||
1131 | mcfrs_change_speed(info); | |
1132 | ||
1133 | if ((old_termios->c_cflag & CRTSCTS) && | |
1134 | !(tty->termios->c_cflag & CRTSCTS)) { | |
1135 | tty->hw_stopped = 0; | |
1136 | mcfrs_setsignals(info, -1, 1); | |
1137 | #if 0 | |
1138 | mcfrs_start(tty); | |
1139 | #endif | |
1140 | } | |
1141 | } | |
1142 | ||
1143 | /* | |
1144 | * ------------------------------------------------------------ | |
1145 | * mcfrs_close() | |
1146 | * | |
1147 | * This routine is called when the serial port gets closed. First, we | |
1148 | * wait for the last remaining data to be sent. Then, we unlink its | |
1149 | * S structure from the interrupt chain if necessary, and we free | |
1150 | * that IRQ if nothing is left in the chain. | |
1151 | * ------------------------------------------------------------ | |
1152 | */ | |
1153 | static void mcfrs_close(struct tty_struct *tty, struct file * filp) | |
1154 | { | |
1155 | volatile unsigned char *uartp; | |
1156 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
1157 | unsigned long flags; | |
1158 | ||
1159 | if (!info || serial_paranoia_check(info, tty->name, "mcfrs_close")) | |
1160 | return; | |
1161 | ||
1162 | local_irq_save(flags); | |
1163 | ||
1164 | if (tty_hung_up_p(filp)) { | |
1165 | local_irq_restore(flags); | |
1166 | return; | |
1167 | } | |
1168 | ||
1169 | #ifdef SERIAL_DEBUG_OPEN | |
1170 | printk("mcfrs_close ttyS%d, count = %d\n", info->line, info->count); | |
1171 | #endif | |
1172 | if ((tty->count == 1) && (info->count != 1)) { | |
1173 | /* | |
1174 | * Uh, oh. tty->count is 1, which means that the tty | |
1175 | * structure will be freed. Info->count should always | |
1176 | * be one in these conditions. If it's greater than | |
1177 | * one, we've got real problems, since it means the | |
1178 | * serial port won't be shutdown. | |
1179 | */ | |
1180 | printk("MCFRS: bad serial port count; tty->count is 1, " | |
1181 | "info->count is %d\n", info->count); | |
1182 | info->count = 1; | |
1183 | } | |
1184 | if (--info->count < 0) { | |
1185 | printk("MCFRS: bad serial port count for ttyS%d: %d\n", | |
1186 | info->line, info->count); | |
1187 | info->count = 0; | |
1188 | } | |
1189 | if (info->count) { | |
1190 | local_irq_restore(flags); | |
1191 | return; | |
1192 | } | |
1193 | info->flags |= ASYNC_CLOSING; | |
1194 | ||
1195 | /* | |
1196 | * Now we wait for the transmit buffer to clear; and we notify | |
1197 | * the line discipline to only process XON/XOFF characters. | |
1198 | */ | |
1199 | tty->closing = 1; | |
1200 | if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) | |
1201 | tty_wait_until_sent(tty, info->closing_wait); | |
1202 | ||
1203 | /* | |
1204 | * At this point we stop accepting input. To do this, we | |
1205 | * disable the receive line status interrupts, and tell the | |
1206 | * interrupt driver to stop checking the data ready bit in the | |
1207 | * line status register. | |
1208 | */ | |
1209 | info->imr &= ~MCFUART_UIR_RXREADY; | |
1210 | uartp = info->addr; | |
1211 | uartp[MCFUART_UIMR] = info->imr; | |
1212 | ||
1213 | #if 0 | |
1214 | /* FIXME: do we need to keep this enabled for console?? */ | |
1215 | if (mcfrs_console_inited && (mcfrs_console_port == info->line)) { | |
1216 | /* Do not disable the UART */ ; | |
1217 | } else | |
1218 | #endif | |
1219 | shutdown(info); | |
1220 | if (tty->driver->flush_buffer) | |
1221 | tty->driver->flush_buffer(tty); | |
1222 | tty_ldisc_flush(tty); | |
1223 | ||
1224 | tty->closing = 0; | |
1225 | info->event = 0; | |
1226 | info->tty = 0; | |
1227 | #if 0 | |
1228 | if (tty->ldisc.num != ldiscs[N_TTY].num) { | |
1229 | if (tty->ldisc.close) | |
1230 | (tty->ldisc.close)(tty); | |
1231 | tty->ldisc = ldiscs[N_TTY]; | |
1232 | tty->termios->c_line = N_TTY; | |
1233 | if (tty->ldisc.open) | |
1234 | (tty->ldisc.open)(tty); | |
1235 | } | |
1236 | #endif | |
1237 | if (info->blocked_open) { | |
1238 | if (info->close_delay) { | |
1239 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); | |
1240 | } | |
1241 | wake_up_interruptible(&info->open_wait); | |
1242 | } | |
1243 | info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); | |
1244 | wake_up_interruptible(&info->close_wait); | |
1245 | local_irq_restore(flags); | |
1246 | } | |
1247 | ||
1248 | /* | |
1249 | * mcfrs_wait_until_sent() --- wait until the transmitter is empty | |
1250 | */ | |
1251 | static void | |
1252 | mcfrs_wait_until_sent(struct tty_struct *tty, int timeout) | |
1253 | { | |
1254 | #ifdef CONFIG_M5272 | |
1255 | #define MCF5272_FIFO_SIZE 25 /* fifo size + shift reg */ | |
1256 | ||
1257 | struct mcf_serial * info = (struct mcf_serial *)tty->driver_data; | |
1258 | volatile unsigned char *uartp; | |
1259 | unsigned long orig_jiffies, fifo_time, char_time, fifo_cnt; | |
1260 | ||
1261 | if (serial_paranoia_check(info, tty->name, "mcfrs_wait_until_sent")) | |
1262 | return; | |
1263 | ||
1264 | orig_jiffies = jiffies; | |
1265 | ||
1266 | /* | |
1267 | * Set the check interval to be 1/5 of the approximate time | |
1268 | * to send the entire fifo, and make it at least 1. The check | |
1269 | * interval should also be less than the timeout. | |
1270 | * | |
1271 | * Note: we have to use pretty tight timings here to satisfy | |
1272 | * the NIST-PCTS. | |
1273 | */ | |
1274 | fifo_time = (MCF5272_FIFO_SIZE * HZ * 10) / info->baud; | |
1275 | char_time = fifo_time / 5; | |
1276 | if (char_time == 0) | |
1277 | char_time = 1; | |
1278 | if (timeout && timeout < char_time) | |
1279 | char_time = timeout; | |
1280 | ||
1281 | /* | |
1282 | * Clamp the timeout period at 2 * the time to empty the | |
1283 | * fifo. Just to be safe, set the minimum at .5 seconds. | |
1284 | */ | |
1285 | fifo_time *= 2; | |
1286 | if (fifo_time < (HZ/2)) | |
1287 | fifo_time = HZ/2; | |
1288 | if (!timeout || timeout > fifo_time) | |
1289 | timeout = fifo_time; | |
1290 | ||
1291 | /* | |
1292 | * Account for the number of bytes in the UART | |
1293 | * transmitter FIFO plus any byte being shifted out. | |
1294 | */ | |
1295 | uartp = (volatile unsigned char *) info->addr; | |
1296 | for (;;) { | |
1297 | fifo_cnt = (uartp[MCFUART_UTF] & MCFUART_UTF_TXB); | |
1298 | if ((uartp[MCFUART_USR] & (MCFUART_USR_TXREADY| | |
1299 | MCFUART_USR_TXEMPTY)) == | |
1300 | MCFUART_USR_TXREADY) | |
1301 | fifo_cnt++; | |
1302 | if (fifo_cnt == 0) | |
1303 | break; | |
1304 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
1305 | if (signal_pending(current)) | |
1306 | break; | |
1307 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
1308 | break; | |
1309 | } | |
1310 | #else | |
1311 | /* | |
1312 | * For the other coldfire models, assume all data has been sent | |
1313 | */ | |
1314 | #endif | |
1315 | } | |
1316 | ||
1317 | /* | |
1318 | * mcfrs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
1319 | */ | |
1320 | void mcfrs_hangup(struct tty_struct *tty) | |
1321 | { | |
1322 | struct mcf_serial * info = (struct mcf_serial *)tty->driver_data; | |
1323 | ||
1324 | if (serial_paranoia_check(info, tty->name, "mcfrs_hangup")) | |
1325 | return; | |
1326 | ||
1327 | mcfrs_flush_buffer(tty); | |
1328 | shutdown(info); | |
1329 | info->event = 0; | |
1330 | info->count = 0; | |
1331 | info->flags &= ~ASYNC_NORMAL_ACTIVE; | |
1332 | info->tty = 0; | |
1333 | wake_up_interruptible(&info->open_wait); | |
1334 | } | |
1335 | ||
1336 | /* | |
1337 | * ------------------------------------------------------------ | |
1338 | * mcfrs_open() and friends | |
1339 | * ------------------------------------------------------------ | |
1340 | */ | |
1341 | static int block_til_ready(struct tty_struct *tty, struct file * filp, | |
1342 | struct mcf_serial *info) | |
1343 | { | |
1344 | DECLARE_WAITQUEUE(wait, current); | |
1345 | int retval; | |
1346 | int do_clocal = 0; | |
1347 | ||
1348 | /* | |
1349 | * If the device is in the middle of being closed, then block | |
1350 | * until it's done, and then try again. | |
1351 | */ | |
1352 | if (info->flags & ASYNC_CLOSING) { | |
1353 | interruptible_sleep_on(&info->close_wait); | |
1354 | #ifdef SERIAL_DO_RESTART | |
1355 | if (info->flags & ASYNC_HUP_NOTIFY) | |
1356 | return -EAGAIN; | |
1357 | else | |
1358 | return -ERESTARTSYS; | |
1359 | #else | |
1360 | return -EAGAIN; | |
1361 | #endif | |
1362 | } | |
1363 | ||
1364 | /* | |
1365 | * If non-blocking mode is set, or the port is not enabled, | |
1366 | * then make the check up front and then exit. | |
1367 | */ | |
1368 | if ((filp->f_flags & O_NONBLOCK) || | |
1369 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
1370 | info->flags |= ASYNC_NORMAL_ACTIVE; | |
1371 | return 0; | |
1372 | } | |
1373 | ||
1374 | if (tty->termios->c_cflag & CLOCAL) | |
1375 | do_clocal = 1; | |
1376 | ||
1377 | /* | |
1378 | * Block waiting for the carrier detect and the line to become | |
1379 | * free (i.e., not in use by the callout). While we are in | |
1380 | * this loop, info->count is dropped by one, so that | |
1381 | * mcfrs_close() knows when to free things. We restore it upon | |
1382 | * exit, either normal or abnormal. | |
1383 | */ | |
1384 | retval = 0; | |
1385 | add_wait_queue(&info->open_wait, &wait); | |
1386 | #ifdef SERIAL_DEBUG_OPEN | |
1387 | printk("block_til_ready before block: ttyS%d, count = %d\n", | |
1388 | info->line, info->count); | |
1389 | #endif | |
1390 | info->count--; | |
1391 | info->blocked_open++; | |
1392 | while (1) { | |
1393 | local_irq_disable(); | |
1394 | mcfrs_setsignals(info, 1, 1); | |
1395 | local_irq_enable(); | |
1396 | current->state = TASK_INTERRUPTIBLE; | |
1397 | if (tty_hung_up_p(filp) || | |
1398 | !(info->flags & ASYNC_INITIALIZED)) { | |
1399 | #ifdef SERIAL_DO_RESTART | |
1400 | if (info->flags & ASYNC_HUP_NOTIFY) | |
1401 | retval = -EAGAIN; | |
1402 | else | |
1403 | retval = -ERESTARTSYS; | |
1404 | #else | |
1405 | retval = -EAGAIN; | |
1406 | #endif | |
1407 | break; | |
1408 | } | |
1409 | if (!(info->flags & ASYNC_CLOSING) && | |
1410 | (do_clocal || (mcfrs_getsignals(info) & TIOCM_CD))) | |
1411 | break; | |
1412 | if (signal_pending(current)) { | |
1413 | retval = -ERESTARTSYS; | |
1414 | break; | |
1415 | } | |
1416 | #ifdef SERIAL_DEBUG_OPEN | |
1417 | printk("block_til_ready blocking: ttyS%d, count = %d\n", | |
1418 | info->line, info->count); | |
1419 | #endif | |
1420 | schedule(); | |
1421 | } | |
1422 | current->state = TASK_RUNNING; | |
1423 | remove_wait_queue(&info->open_wait, &wait); | |
1424 | if (!tty_hung_up_p(filp)) | |
1425 | info->count++; | |
1426 | info->blocked_open--; | |
1427 | #ifdef SERIAL_DEBUG_OPEN | |
1428 | printk("block_til_ready after blocking: ttyS%d, count = %d\n", | |
1429 | info->line, info->count); | |
1430 | #endif | |
1431 | if (retval) | |
1432 | return retval; | |
1433 | info->flags |= ASYNC_NORMAL_ACTIVE; | |
1434 | return 0; | |
1435 | } | |
1436 | ||
1437 | /* | |
1438 | * This routine is called whenever a serial port is opened. It | |
1439 | * enables interrupts for a serial port, linking in its structure into | |
1440 | * the IRQ chain. It also performs the serial-specific | |
1441 | * initialization for the tty structure. | |
1442 | */ | |
1443 | int mcfrs_open(struct tty_struct *tty, struct file * filp) | |
1444 | { | |
1445 | struct mcf_serial *info; | |
1446 | int retval, line; | |
1447 | ||
1448 | line = tty->index; | |
1449 | if ((line < 0) || (line >= NR_PORTS)) | |
1450 | return -ENODEV; | |
1451 | info = mcfrs_table + line; | |
1452 | if (serial_paranoia_check(info, tty->name, "mcfrs_open")) | |
1453 | return -ENODEV; | |
1454 | #ifdef SERIAL_DEBUG_OPEN | |
1455 | printk("mcfrs_open %s, count = %d\n", tty->name, info->count); | |
1456 | #endif | |
1457 | info->count++; | |
1458 | tty->driver_data = info; | |
1459 | info->tty = tty; | |
1460 | ||
1461 | /* | |
1462 | * Start up serial port | |
1463 | */ | |
1464 | retval = startup(info); | |
1465 | if (retval) | |
1466 | return retval; | |
1467 | ||
1468 | retval = block_til_ready(tty, filp, info); | |
1469 | if (retval) { | |
1470 | #ifdef SERIAL_DEBUG_OPEN | |
1471 | printk("mcfrs_open returning after block_til_ready with %d\n", | |
1472 | retval); | |
1473 | #endif | |
1474 | return retval; | |
1475 | } | |
1476 | ||
1477 | #ifdef SERIAL_DEBUG_OPEN | |
1478 | printk("mcfrs_open %s successful...\n", tty->name); | |
1479 | #endif | |
1480 | return 0; | |
1481 | } | |
1482 | ||
1483 | /* | |
1484 | * Based on the line number set up the internal interrupt stuff. | |
1485 | */ | |
1486 | static void mcfrs_irqinit(struct mcf_serial *info) | |
1487 | { | |
1488 | #if defined(CONFIG_M5272) | |
1489 | volatile unsigned long *icrp; | |
1490 | volatile unsigned long *portp; | |
1491 | volatile unsigned char *uartp; | |
1492 | ||
1493 | uartp = info->addr; | |
1494 | icrp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_ICR2); | |
1495 | ||
1496 | switch (info->line) { | |
1497 | case 0: | |
1498 | *icrp = 0xe0000000; | |
1499 | break; | |
1500 | case 1: | |
1501 | *icrp = 0x0e000000; | |
1502 | break; | |
1503 | default: | |
1504 | printk("MCFRS: don't know how to handle UART %d interrupt?\n", | |
1505 | info->line); | |
1506 | return; | |
1507 | } | |
1508 | ||
1509 | /* Enable the output lines for the serial ports */ | |
1510 | portp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_PBCNT); | |
1511 | *portp = (*portp & ~0x000000ff) | 0x00000055; | |
1512 | portp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_PDCNT); | |
1513 | *portp = (*portp & ~0x000003fc) | 0x000002a8; | |
1514 | #elif defined(CONFIG_M527x) || defined(CONFIG_M528x) | |
1515 | volatile unsigned char *icrp, *uartp; | |
1516 | volatile unsigned long *imrp; | |
1517 | ||
1518 | uartp = info->addr; | |
1519 | ||
1520 | icrp = (volatile unsigned char *) (MCF_MBAR + MCFICM_INTC0 + | |
1521 | MCFINTC_ICR0 + MCFINT_UART0 + info->line); | |
1522 | *icrp = 0x33; /* UART0 with level 6, priority 3 */ | |
1523 | ||
1524 | imrp = (volatile unsigned long *) (MCF_MBAR + MCFICM_INTC0 + | |
1525 | MCFINTC_IMRL); | |
1526 | *imrp &= ~((1 << (info->irq - MCFINT_VECBASE)) | 1); | |
1527 | #else | |
1528 | volatile unsigned char *icrp, *uartp; | |
1529 | ||
1530 | switch (info->line) { | |
1531 | case 0: | |
1532 | icrp = (volatile unsigned char *) (MCF_MBAR + MCFSIM_UART1ICR); | |
1533 | *icrp = /*MCFSIM_ICR_AUTOVEC |*/ MCFSIM_ICR_LEVEL6 | | |
1534 | MCFSIM_ICR_PRI1; | |
1535 | mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_UART1); | |
1536 | break; | |
1537 | case 1: | |
1538 | icrp = (volatile unsigned char *) (MCF_MBAR + MCFSIM_UART2ICR); | |
1539 | *icrp = /*MCFSIM_ICR_AUTOVEC |*/ MCFSIM_ICR_LEVEL6 | | |
1540 | MCFSIM_ICR_PRI2; | |
1541 | mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_UART2); | |
1542 | break; | |
1543 | default: | |
1544 | printk("MCFRS: don't know how to handle UART %d interrupt?\n", | |
1545 | info->line); | |
1546 | return; | |
1547 | } | |
1548 | ||
1549 | uartp = info->addr; | |
1550 | uartp[MCFUART_UIVR] = info->irq; | |
1551 | #endif | |
1552 | ||
1553 | /* Clear mask, so no surprise interrupts. */ | |
1554 | uartp[MCFUART_UIMR] = 0; | |
1555 | ||
1556 | if (request_irq(info->irq, mcfrs_interrupt, SA_INTERRUPT, | |
1557 | "ColdFire UART", NULL)) { | |
1558 | printk("MCFRS: Unable to attach ColdFire UART %d interrupt " | |
1559 | "vector=%d\n", info->line, info->irq); | |
1560 | } | |
1561 | ||
1562 | return; | |
1563 | } | |
1564 | ||
1565 | ||
1566 | char *mcfrs_drivername = "ColdFire internal UART serial driver version 1.00\n"; | |
1567 | ||
1568 | ||
1569 | /* | |
1570 | * Serial stats reporting... | |
1571 | */ | |
1572 | int mcfrs_readproc(char *page, char **start, off_t off, int count, | |
1573 | int *eof, void *data) | |
1574 | { | |
1575 | struct mcf_serial *info; | |
1576 | char str[20]; | |
1577 | int len, sigs, i; | |
1578 | ||
1579 | len = sprintf(page, mcfrs_drivername); | |
1580 | for (i = 0; (i < NR_PORTS); i++) { | |
1581 | info = &mcfrs_table[i]; | |
1582 | len += sprintf((page + len), "%d: port:%x irq=%d baud:%d ", | |
1583 | i, (unsigned int) info->addr, info->irq, info->baud); | |
1584 | if (info->stats.rx || info->stats.tx) | |
1585 | len += sprintf((page + len), "tx:%d rx:%d ", | |
1586 | info->stats.tx, info->stats.rx); | |
1587 | if (info->stats.rxframing) | |
1588 | len += sprintf((page + len), "fe:%d ", | |
1589 | info->stats.rxframing); | |
1590 | if (info->stats.rxparity) | |
1591 | len += sprintf((page + len), "pe:%d ", | |
1592 | info->stats.rxparity); | |
1593 | if (info->stats.rxbreak) | |
1594 | len += sprintf((page + len), "brk:%d ", | |
1595 | info->stats.rxbreak); | |
1596 | if (info->stats.rxoverrun) | |
1597 | len += sprintf((page + len), "oe:%d ", | |
1598 | info->stats.rxoverrun); | |
1599 | ||
1600 | str[0] = str[1] = 0; | |
1601 | if ((sigs = mcfrs_getsignals(info))) { | |
1602 | if (sigs & TIOCM_RTS) | |
1603 | strcat(str, "|RTS"); | |
1604 | if (sigs & TIOCM_CTS) | |
1605 | strcat(str, "|CTS"); | |
1606 | if (sigs & TIOCM_DTR) | |
1607 | strcat(str, "|DTR"); | |
1608 | if (sigs & TIOCM_CD) | |
1609 | strcat(str, "|CD"); | |
1610 | } | |
1611 | ||
1612 | len += sprintf((page + len), "%s\n", &str[1]); | |
1613 | } | |
1614 | ||
1615 | return(len); | |
1616 | } | |
1617 | ||
1618 | ||
1619 | /* Finally, routines used to initialize the serial driver. */ | |
1620 | ||
1621 | static void show_serial_version(void) | |
1622 | { | |
1623 | printk(mcfrs_drivername); | |
1624 | } | |
1625 | ||
1626 | static struct tty_operations mcfrs_ops = { | |
1627 | .open = mcfrs_open, | |
1628 | .close = mcfrs_close, | |
1629 | .write = mcfrs_write, | |
1630 | .flush_chars = mcfrs_flush_chars, | |
1631 | .write_room = mcfrs_write_room, | |
1632 | .chars_in_buffer = mcfrs_chars_in_buffer, | |
1633 | .flush_buffer = mcfrs_flush_buffer, | |
1634 | .ioctl = mcfrs_ioctl, | |
1635 | .throttle = mcfrs_throttle, | |
1636 | .unthrottle = mcfrs_unthrottle, | |
1637 | .set_termios = mcfrs_set_termios, | |
1638 | .stop = mcfrs_stop, | |
1639 | .start = mcfrs_start, | |
1640 | .hangup = mcfrs_hangup, | |
1641 | .read_proc = mcfrs_readproc, | |
1642 | .wait_until_sent = mcfrs_wait_until_sent, | |
1643 | .tiocmget = mcfrs_tiocmget, | |
1644 | .tiocmset = mcfrs_tiocmset, | |
1645 | }; | |
1646 | ||
1647 | /* mcfrs_init inits the driver */ | |
1648 | static int __init | |
1649 | mcfrs_init(void) | |
1650 | { | |
1651 | struct mcf_serial *info; | |
1652 | unsigned long flags; | |
1653 | int i; | |
1654 | ||
1655 | /* Setup base handler, and timer table. */ | |
1656 | #ifdef MCFPP_DCD0 | |
1657 | init_timer(&mcfrs_timer_struct); | |
1658 | mcfrs_timer_struct.function = mcfrs_timer; | |
1659 | mcfrs_timer_struct.data = 0; | |
1660 | mcfrs_timer_struct.expires = jiffies + HZ/25; | |
1661 | add_timer(&mcfrs_timer_struct); | |
1662 | mcfrs_ppstatus = mcf_getppdata() & (MCFPP_DCD0 | MCFPP_DCD1); | |
1663 | #endif | |
1664 | mcfrs_serial_driver = alloc_tty_driver(NR_PORTS); | |
1665 | if (!mcfrs_serial_driver) | |
1666 | return -ENOMEM; | |
1667 | ||
1668 | show_serial_version(); | |
1669 | ||
1670 | /* Initialize the tty_driver structure */ | |
1671 | mcfrs_serial_driver->owner = THIS_MODULE; | |
1672 | mcfrs_serial_driver->name = "ttyS"; | |
1673 | mcfrs_serial_driver->devfs_name = "ttys/"; | |
1674 | mcfrs_serial_driver->driver_name = "serial"; | |
1675 | mcfrs_serial_driver->major = TTY_MAJOR; | |
1676 | mcfrs_serial_driver->minor_start = 64; | |
1677 | mcfrs_serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
1678 | mcfrs_serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
1679 | mcfrs_serial_driver->init_termios = tty_std_termios; | |
1680 | ||
1681 | mcfrs_serial_driver->init_termios.c_cflag = | |
1682 | mcfrs_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL; | |
1683 | mcfrs_serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
1684 | ||
1685 | tty_set_operations(mcfrs_serial_driver, &mcfrs_ops); | |
1686 | ||
1687 | if (tty_register_driver(mcfrs_serial_driver)) { | |
1688 | printk("MCFRS: Couldn't register serial driver\n"); | |
1689 | put_tty_driver(mcfrs_serial_driver); | |
1690 | return(-EBUSY); | |
1691 | } | |
1692 | ||
1693 | local_irq_save(flags); | |
1694 | ||
1695 | /* | |
1696 | * Configure all the attached serial ports. | |
1697 | */ | |
1698 | for (i = 0, info = mcfrs_table; (i < NR_PORTS); i++, info++) { | |
1699 | info->magic = SERIAL_MAGIC; | |
1700 | info->line = i; | |
1701 | info->tty = 0; | |
1702 | info->custom_divisor = 16; | |
1703 | info->close_delay = 50; | |
1704 | info->closing_wait = 3000; | |
1705 | info->x_char = 0; | |
1706 | info->event = 0; | |
1707 | info->count = 0; | |
1708 | info->blocked_open = 0; | |
1709 | INIT_WORK(&info->tqueue, mcfrs_offintr, info); | |
1710 | INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info); | |
1711 | init_waitqueue_head(&info->open_wait); | |
1712 | init_waitqueue_head(&info->close_wait); | |
1713 | ||
1714 | info->imr = 0; | |
1715 | mcfrs_setsignals(info, 0, 0); | |
1716 | mcfrs_irqinit(info); | |
1717 | ||
1718 | printk("ttyS%d at 0x%04x (irq = %d)", info->line, | |
1719 | (unsigned int) info->addr, info->irq); | |
1720 | printk(" is a builtin ColdFire UART\n"); | |
1721 | } | |
1722 | ||
1723 | local_irq_restore(flags); | |
1724 | return 0; | |
1725 | } | |
1726 | ||
1727 | module_init(mcfrs_init); | |
1728 | ||
1729 | /****************************************************************************/ | |
1730 | /* Serial Console */ | |
1731 | /****************************************************************************/ | |
1732 | ||
1733 | /* | |
1734 | * Quick and dirty UART initialization, for console output. | |
1735 | */ | |
1736 | ||
1737 | void mcfrs_init_console(void) | |
1738 | { | |
1739 | volatile unsigned char *uartp; | |
1740 | unsigned int clk; | |
1741 | ||
1742 | /* | |
1743 | * Reset UART, get it into known state... | |
1744 | */ | |
1745 | uartp = (volatile unsigned char *) (MCF_MBAR + | |
1746 | (mcfrs_console_port ? MCFUART_BASE2 : MCFUART_BASE1)); | |
1747 | ||
1748 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */ | |
1749 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */ | |
1750 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETMRPTR; /* reset MR pointer */ | |
1751 | ||
1752 | /* | |
1753 | * Set port for defined baud , 8 data bits, 1 stop bit, no parity. | |
1754 | */ | |
1755 | uartp[MCFUART_UMR] = MCFUART_MR1_PARITYNONE | MCFUART_MR1_CS8; | |
1756 | uartp[MCFUART_UMR] = MCFUART_MR2_STOP1; | |
1757 | ||
1758 | clk = ((MCF_BUSCLK / mcfrs_console_baud) + 16) / 32; /* set baud */ | |
1759 | uartp[MCFUART_UBG1] = (clk & 0xff00) >> 8; /* set msb baud */ | |
1760 | uartp[MCFUART_UBG2] = (clk & 0xff); /* set lsb baud */ | |
1761 | ||
1762 | uartp[MCFUART_UCSR] = MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER; | |
1763 | uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE; | |
1764 | ||
1765 | mcfrs_console_inited++; | |
1766 | return; | |
1767 | } | |
1768 | ||
1769 | ||
1770 | /* | |
1771 | * Setup for console. Argument comes from the boot command line. | |
1772 | */ | |
1773 | ||
1774 | int mcfrs_console_setup(struct console *cp, char *arg) | |
1775 | { | |
1776 | int i, n = CONSOLE_BAUD_RATE; | |
1777 | ||
1778 | if (!cp) | |
1779 | return(-1); | |
1780 | ||
1781 | if (!strncmp(cp->name, "ttyS", 4)) | |
1782 | mcfrs_console_port = cp->index; | |
1783 | else if (!strncmp(cp->name, "cua", 3)) | |
1784 | mcfrs_console_port = cp->index; | |
1785 | else | |
1786 | return(-1); | |
1787 | ||
1788 | if (arg) | |
1789 | n = simple_strtoul(arg,NULL,0); | |
1790 | for (i = 0; i < MCFRS_BAUD_TABLE_SIZE; i++) | |
1791 | if (mcfrs_baud_table[i] == n) | |
1792 | break; | |
1793 | if (i < MCFRS_BAUD_TABLE_SIZE) { | |
1794 | mcfrs_console_baud = n; | |
1795 | mcfrs_console_cbaud = 0; | |
1796 | if (i > 15) { | |
1797 | mcfrs_console_cbaud |= CBAUDEX; | |
1798 | i -= 15; | |
1799 | } | |
1800 | mcfrs_console_cbaud |= i; | |
1801 | } | |
1802 | mcfrs_init_console(); /* make sure baud rate changes */ | |
1803 | return(0); | |
1804 | } | |
1805 | ||
1806 | ||
1807 | static struct tty_driver *mcfrs_console_device(struct console *c, int *index) | |
1808 | { | |
1809 | *index = c->index; | |
1810 | return mcfrs_serial_driver; | |
1811 | } | |
1812 | ||
1813 | ||
1814 | /* | |
1815 | * Output a single character, using UART polled mode. | |
1816 | * This is used for console output. | |
1817 | */ | |
1818 | ||
1819 | void mcfrs_put_char(char ch) | |
1820 | { | |
1821 | volatile unsigned char *uartp; | |
1822 | unsigned long flags; | |
1823 | int i; | |
1824 | ||
1825 | uartp = (volatile unsigned char *) (MCF_MBAR + | |
1826 | (mcfrs_console_port ? MCFUART_BASE2 : MCFUART_BASE1)); | |
1827 | ||
1828 | local_irq_save(flags); | |
1829 | for (i = 0; (i < 0x10000); i++) { | |
1830 | if (uartp[MCFUART_USR] & MCFUART_USR_TXREADY) | |
1831 | break; | |
1832 | } | |
1833 | if (i < 0x10000) { | |
1834 | uartp[MCFUART_UTB] = ch; | |
1835 | for (i = 0; (i < 0x10000); i++) | |
1836 | if (uartp[MCFUART_USR] & MCFUART_USR_TXEMPTY) | |
1837 | break; | |
1838 | } | |
1839 | if (i >= 0x10000) | |
1840 | mcfrs_init_console(); /* try and get it back */ | |
1841 | local_irq_restore(flags); | |
1842 | ||
1843 | return; | |
1844 | } | |
1845 | ||
1846 | ||
1847 | /* | |
1848 | * rs_console_write is registered for printk output. | |
1849 | */ | |
1850 | ||
1851 | void mcfrs_console_write(struct console *cp, const char *p, unsigned len) | |
1852 | { | |
1853 | if (!mcfrs_console_inited) | |
1854 | mcfrs_init_console(); | |
1855 | while (len-- > 0) { | |
1856 | if (*p == '\n') | |
1857 | mcfrs_put_char('\r'); | |
1858 | mcfrs_put_char(*p++); | |
1859 | } | |
1860 | } | |
1861 | ||
1862 | /* | |
1863 | * declare our consoles | |
1864 | */ | |
1865 | ||
1866 | struct console mcfrs_console = { | |
1867 | .name = "ttyS", | |
1868 | .write = mcfrs_console_write, | |
1869 | .device = mcfrs_console_device, | |
1870 | .setup = mcfrs_console_setup, | |
1871 | .flags = CON_PRINTBUFFER, | |
1872 | .index = -1, | |
1873 | }; | |
1874 | ||
1875 | static int __init mcfrs_console_init(void) | |
1876 | { | |
1877 | register_console(&mcfrs_console); | |
1878 | return 0; | |
1879 | } | |
1880 | ||
1881 | console_initcall(mcfrs_console_init); | |
1882 | ||
1883 | /****************************************************************************/ |