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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> | |
1da177e4 LT |
43 | #include <asm/semaphore.h> |
44 | #include <asm/delay.h> | |
45 | #include <asm/coldfire.h> | |
46 | #include <asm/mcfsim.h> | |
47 | #include <asm/mcfuart.h> | |
48 | #include <asm/nettel.h> | |
49 | #include <asm/uaccess.h> | |
50 | #include "mcfserial.h" | |
51 | ||
52 | struct timer_list mcfrs_timer_struct; | |
53 | ||
54 | /* | |
55 | * Default console baud rate, we use this as the default | |
56 | * for all ports so init can just open /dev/console and | |
57 | * keep going. Perhaps one day the cflag settings for the | |
58 | * console can be used instead. | |
59 | */ | |
60 | #if defined(CONFIG_ARNEWSH) || defined(CONFIG_MOTOROLA) || defined(CONFIG_senTec) || defined(CONFIG_SNEHA) | |
61 | #define CONSOLE_BAUD_RATE 19200 | |
62 | #define DEFAULT_CBAUD B19200 | |
63 | #endif | |
64 | ||
65 | #if defined(CONFIG_HW_FEITH) | |
66 | #define CONSOLE_BAUD_RATE 38400 | |
67 | #define DEFAULT_CBAUD B38400 | |
68 | #endif | |
69 | ||
70 | #ifndef CONSOLE_BAUD_RATE | |
71 | #define CONSOLE_BAUD_RATE 9600 | |
72 | #define DEFAULT_CBAUD B9600 | |
73 | #endif | |
74 | ||
75 | int mcfrs_console_inited = 0; | |
76 | int mcfrs_console_port = -1; | |
77 | int mcfrs_console_baud = CONSOLE_BAUD_RATE; | |
78 | int mcfrs_console_cbaud = DEFAULT_CBAUD; | |
79 | ||
80 | /* | |
81 | * Driver data structures. | |
82 | */ | |
83 | static struct tty_driver *mcfrs_serial_driver; | |
84 | ||
85 | /* number of characters left in xmit buffer before we ask for more */ | |
86 | #define WAKEUP_CHARS 256 | |
87 | ||
88 | /* Debugging... | |
89 | */ | |
90 | #undef SERIAL_DEBUG_OPEN | |
91 | #undef SERIAL_DEBUG_FLOW | |
92 | ||
93 | #if defined(CONFIG_M527x) || defined(CONFIG_M528x) | |
94 | #define IRQBASE (MCFINT_VECBASE+MCFINT_UART0) | |
95 | #else | |
96 | #define IRQBASE 73 | |
97 | #endif | |
98 | ||
99 | /* | |
100 | * Configuration table, UARTs to look for at startup. | |
101 | */ | |
102 | static struct mcf_serial mcfrs_table[] = { | |
103 | { /* ttyS0 */ | |
104 | .magic = 0, | |
105 | .addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE1), | |
106 | .irq = IRQBASE, | |
107 | .flags = ASYNC_BOOT_AUTOCONF, | |
108 | }, | |
109 | { /* ttyS1 */ | |
110 | .magic = 0, | |
111 | .addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE2), | |
112 | .irq = IRQBASE+1, | |
113 | .flags = ASYNC_BOOT_AUTOCONF, | |
114 | }, | |
115 | }; | |
116 | ||
117 | ||
118 | #define NR_PORTS (sizeof(mcfrs_table) / sizeof(struct mcf_serial)) | |
119 | ||
120 | /* | |
121 | * This is used to figure out the divisor speeds and the timeouts. | |
122 | */ | |
123 | static int mcfrs_baud_table[] = { | |
124 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, | |
125 | 9600, 19200, 38400, 57600, 115200, 230400, 460800, 0 | |
126 | }; | |
127 | #define MCFRS_BAUD_TABLE_SIZE \ | |
128 | (sizeof(mcfrs_baud_table)/sizeof(mcfrs_baud_table[0])) | |
129 | ||
130 | ||
131 | #ifdef CONFIG_MAGIC_SYSRQ | |
132 | /* | |
133 | * Magic system request keys. Used for debugging... | |
134 | */ | |
135 | extern int magic_sysrq_key(int ch); | |
136 | #endif | |
137 | ||
138 | ||
139 | /* | |
140 | * Forware declarations... | |
141 | */ | |
142 | static void mcfrs_change_speed(struct mcf_serial *info); | |
143 | static void mcfrs_wait_until_sent(struct tty_struct *tty, int timeout); | |
144 | ||
145 | ||
146 | static inline int serial_paranoia_check(struct mcf_serial *info, | |
147 | char *name, const char *routine) | |
148 | { | |
149 | #ifdef SERIAL_PARANOIA_CHECK | |
150 | static const char badmagic[] = | |
151 | "MCFRS(warning): bad magic number for serial struct %s in %s\n"; | |
152 | static const char badinfo[] = | |
153 | "MCFRS(warning): null mcf_serial for %s in %s\n"; | |
154 | ||
155 | if (!info) { | |
156 | printk(badinfo, name, routine); | |
157 | return 1; | |
158 | } | |
159 | if (info->magic != SERIAL_MAGIC) { | |
160 | printk(badmagic, name, routine); | |
161 | return 1; | |
162 | } | |
163 | #endif | |
164 | return 0; | |
165 | } | |
166 | ||
167 | /* | |
168 | * Sets or clears DTR and RTS on the requested line. | |
169 | */ | |
170 | static void mcfrs_setsignals(struct mcf_serial *info, int dtr, int rts) | |
171 | { | |
172 | volatile unsigned char *uartp; | |
173 | unsigned long flags; | |
174 | ||
175 | #if 0 | |
176 | printk("%s(%d): mcfrs_setsignals(info=%x,dtr=%d,rts=%d)\n", | |
177 | __FILE__, __LINE__, info, dtr, rts); | |
178 | #endif | |
179 | ||
180 | local_irq_save(flags); | |
181 | if (dtr >= 0) { | |
182 | #ifdef MCFPP_DTR0 | |
183 | if (info->line) | |
184 | mcf_setppdata(MCFPP_DTR1, (dtr ? 0 : MCFPP_DTR1)); | |
185 | else | |
186 | mcf_setppdata(MCFPP_DTR0, (dtr ? 0 : MCFPP_DTR0)); | |
187 | #endif | |
188 | } | |
189 | if (rts >= 0) { | |
190 | uartp = info->addr; | |
191 | if (rts) { | |
192 | info->sigs |= TIOCM_RTS; | |
193 | uartp[MCFUART_UOP1] = MCFUART_UOP_RTS; | |
194 | } else { | |
195 | info->sigs &= ~TIOCM_RTS; | |
196 | uartp[MCFUART_UOP0] = MCFUART_UOP_RTS; | |
197 | } | |
198 | } | |
199 | local_irq_restore(flags); | |
200 | return; | |
201 | } | |
202 | ||
203 | /* | |
204 | * Gets values of serial signals. | |
205 | */ | |
206 | static int mcfrs_getsignals(struct mcf_serial *info) | |
207 | { | |
208 | volatile unsigned char *uartp; | |
209 | unsigned long flags; | |
210 | int sigs; | |
211 | #if defined(CONFIG_NETtel) && defined(CONFIG_M5307) | |
212 | unsigned short ppdata; | |
213 | #endif | |
214 | ||
215 | #if 0 | |
216 | printk("%s(%d): mcfrs_getsignals(info=%x)\n", __FILE__, __LINE__); | |
217 | #endif | |
218 | ||
219 | local_irq_save(flags); | |
220 | uartp = info->addr; | |
221 | sigs = (uartp[MCFUART_UIPR] & MCFUART_UIPR_CTS) ? 0 : TIOCM_CTS; | |
222 | sigs |= (info->sigs & TIOCM_RTS); | |
223 | ||
224 | #ifdef MCFPP_DCD0 | |
225 | { | |
226 | unsigned int ppdata; | |
227 | ppdata = mcf_getppdata(); | |
228 | if (info->line == 0) { | |
229 | sigs |= (ppdata & MCFPP_DCD0) ? 0 : TIOCM_CD; | |
230 | sigs |= (ppdata & MCFPP_DTR0) ? 0 : TIOCM_DTR; | |
231 | } else if (info->line == 1) { | |
232 | sigs |= (ppdata & MCFPP_DCD1) ? 0 : TIOCM_CD; | |
233 | sigs |= (ppdata & MCFPP_DTR1) ? 0 : TIOCM_DTR; | |
234 | } | |
235 | } | |
236 | #endif | |
237 | ||
238 | local_irq_restore(flags); | |
239 | return(sigs); | |
240 | } | |
241 | ||
242 | /* | |
243 | * ------------------------------------------------------------ | |
244 | * mcfrs_stop() and mcfrs_start() | |
245 | * | |
246 | * This routines are called before setting or resetting tty->stopped. | |
247 | * They enable or disable transmitter interrupts, as necessary. | |
248 | * ------------------------------------------------------------ | |
249 | */ | |
250 | static void mcfrs_stop(struct tty_struct *tty) | |
251 | { | |
252 | volatile unsigned char *uartp; | |
253 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
254 | unsigned long flags; | |
255 | ||
256 | if (serial_paranoia_check(info, tty->name, "mcfrs_stop")) | |
257 | return; | |
258 | ||
259 | local_irq_save(flags); | |
260 | uartp = info->addr; | |
261 | info->imr &= ~MCFUART_UIR_TXREADY; | |
262 | uartp[MCFUART_UIMR] = info->imr; | |
263 | local_irq_restore(flags); | |
264 | } | |
265 | ||
266 | static void mcfrs_start(struct tty_struct *tty) | |
267 | { | |
268 | volatile unsigned char *uartp; | |
269 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
270 | unsigned long flags; | |
271 | ||
272 | if (serial_paranoia_check(info, tty->name, "mcfrs_start")) | |
273 | return; | |
274 | ||
275 | local_irq_save(flags); | |
276 | if (info->xmit_cnt && info->xmit_buf) { | |
277 | uartp = info->addr; | |
278 | info->imr |= MCFUART_UIR_TXREADY; | |
279 | uartp[MCFUART_UIMR] = info->imr; | |
280 | } | |
281 | local_irq_restore(flags); | |
282 | } | |
283 | ||
284 | /* | |
285 | * ---------------------------------------------------------------------- | |
286 | * | |
287 | * Here starts the interrupt handling routines. All of the following | |
288 | * subroutines are declared as inline and are folded into | |
289 | * mcfrs_interrupt(). They were separated out for readability's sake. | |
290 | * | |
291 | * Note: mcfrs_interrupt() is a "fast" interrupt, which means that it | |
292 | * runs with interrupts turned off. People who may want to modify | |
293 | * mcfrs_interrupt() should try to keep the interrupt handler as fast as | |
294 | * possible. After you are done making modifications, it is not a bad | |
295 | * idea to do: | |
296 | * | |
297 | * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c | |
298 | * | |
299 | * and look at the resulting assemble code in serial.s. | |
300 | * | |
301 | * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 | |
302 | * ----------------------------------------------------------------------- | |
303 | */ | |
304 | ||
305 | static inline void receive_chars(struct mcf_serial *info) | |
306 | { | |
307 | volatile unsigned char *uartp; | |
308 | struct tty_struct *tty = info->tty; | |
309 | unsigned char status, ch; | |
310 | ||
311 | if (!tty) | |
312 | return; | |
313 | ||
314 | uartp = info->addr; | |
315 | ||
316 | while ((status = uartp[MCFUART_USR]) & MCFUART_USR_RXREADY) { | |
317 | ||
318 | if (tty->flip.count >= TTY_FLIPBUF_SIZE) | |
319 | break; | |
320 | ||
321 | ch = uartp[MCFUART_URB]; | |
322 | info->stats.rx++; | |
323 | ||
324 | #ifdef CONFIG_MAGIC_SYSRQ | |
325 | if (mcfrs_console_inited && (info->line == mcfrs_console_port)) { | |
326 | if (magic_sysrq_key(ch)) | |
327 | continue; | |
328 | } | |
329 | #endif | |
330 | ||
331 | tty->flip.count++; | |
332 | if (status & MCFUART_USR_RXERR) { | |
333 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETERR; | |
334 | if (status & MCFUART_USR_RXBREAK) { | |
335 | info->stats.rxbreak++; | |
336 | *tty->flip.flag_buf_ptr++ = TTY_BREAK; | |
337 | } else if (status & MCFUART_USR_RXPARITY) { | |
338 | info->stats.rxparity++; | |
339 | *tty->flip.flag_buf_ptr++ = TTY_PARITY; | |
340 | } else if (status & MCFUART_USR_RXOVERRUN) { | |
341 | info->stats.rxoverrun++; | |
342 | *tty->flip.flag_buf_ptr++ = TTY_OVERRUN; | |
343 | } else if (status & MCFUART_USR_RXFRAMING) { | |
344 | info->stats.rxframing++; | |
345 | *tty->flip.flag_buf_ptr++ = TTY_FRAME; | |
346 | } else { | |
347 | /* This should never happen... */ | |
348 | *tty->flip.flag_buf_ptr++ = 0; | |
349 | } | |
350 | } else { | |
351 | *tty->flip.flag_buf_ptr++ = 0; | |
352 | } | |
353 | *tty->flip.char_buf_ptr++ = ch; | |
354 | } | |
355 | ||
356 | schedule_work(&tty->flip.work); | |
357 | return; | |
358 | } | |
359 | ||
360 | static inline void transmit_chars(struct mcf_serial *info) | |
361 | { | |
362 | volatile unsigned char *uartp; | |
363 | ||
364 | uartp = info->addr; | |
365 | ||
366 | if (info->x_char) { | |
367 | /* Send special char - probably flow control */ | |
368 | uartp[MCFUART_UTB] = info->x_char; | |
369 | info->x_char = 0; | |
370 | info->stats.tx++; | |
371 | } | |
372 | ||
373 | if ((info->xmit_cnt <= 0) || info->tty->stopped) { | |
374 | info->imr &= ~MCFUART_UIR_TXREADY; | |
375 | uartp[MCFUART_UIMR] = info->imr; | |
376 | return; | |
377 | } | |
378 | ||
379 | while (uartp[MCFUART_USR] & MCFUART_USR_TXREADY) { | |
380 | uartp[MCFUART_UTB] = info->xmit_buf[info->xmit_tail++]; | |
381 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
382 | info->stats.tx++; | |
383 | if (--info->xmit_cnt <= 0) | |
384 | break; | |
385 | } | |
386 | ||
387 | if (info->xmit_cnt < WAKEUP_CHARS) | |
388 | schedule_work(&info->tqueue); | |
389 | return; | |
390 | } | |
391 | ||
392 | /* | |
393 | * This is the serial driver's generic interrupt routine | |
394 | */ | |
395 | irqreturn_t mcfrs_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
396 | { | |
397 | struct mcf_serial *info; | |
398 | unsigned char isr; | |
399 | ||
400 | info = &mcfrs_table[(irq - IRQBASE)]; | |
401 | isr = info->addr[MCFUART_UISR] & info->imr; | |
402 | ||
403 | if (isr & MCFUART_UIR_RXREADY) | |
404 | receive_chars(info); | |
405 | if (isr & MCFUART_UIR_TXREADY) | |
406 | transmit_chars(info); | |
407 | return IRQ_HANDLED; | |
408 | } | |
409 | ||
410 | /* | |
411 | * ------------------------------------------------------------------- | |
412 | * Here ends the serial interrupt routines. | |
413 | * ------------------------------------------------------------------- | |
414 | */ | |
415 | ||
416 | static void mcfrs_offintr(void *private) | |
417 | { | |
418 | struct mcf_serial *info = (struct mcf_serial *) private; | |
419 | struct tty_struct *tty; | |
420 | ||
421 | tty = info->tty; | |
422 | if (!tty) | |
423 | return; | |
424 | tty_wakeup(tty); | |
425 | } | |
426 | ||
427 | ||
428 | /* | |
429 | * Change of state on a DCD line. | |
430 | */ | |
431 | void mcfrs_modem_change(struct mcf_serial *info, int dcd) | |
432 | { | |
433 | if (info->count == 0) | |
434 | return; | |
435 | ||
436 | if (info->flags & ASYNC_CHECK_CD) { | |
437 | if (dcd) | |
438 | wake_up_interruptible(&info->open_wait); | |
439 | else | |
440 | schedule_work(&info->tqueue_hangup); | |
441 | } | |
442 | } | |
443 | ||
444 | ||
445 | #ifdef MCFPP_DCD0 | |
446 | ||
447 | unsigned short mcfrs_ppstatus; | |
448 | ||
449 | /* | |
450 | * This subroutine is called when the RS_TIMER goes off. It is used | |
451 | * to monitor the state of the DCD lines - since they have no edge | |
452 | * sensors and interrupt generators. | |
453 | */ | |
454 | static void mcfrs_timer(void) | |
455 | { | |
456 | unsigned int ppstatus, dcdval, i; | |
457 | ||
458 | ppstatus = mcf_getppdata() & (MCFPP_DCD0 | MCFPP_DCD1); | |
459 | ||
460 | if (ppstatus != mcfrs_ppstatus) { | |
461 | for (i = 0; (i < 2); i++) { | |
462 | dcdval = (i ? MCFPP_DCD1 : MCFPP_DCD0); | |
463 | if ((ppstatus & dcdval) != (mcfrs_ppstatus & dcdval)) { | |
464 | mcfrs_modem_change(&mcfrs_table[i], | |
465 | ((ppstatus & dcdval) ? 0 : 1)); | |
466 | } | |
467 | } | |
468 | } | |
469 | mcfrs_ppstatus = ppstatus; | |
470 | ||
471 | /* Re-arm timer */ | |
472 | mcfrs_timer_struct.expires = jiffies + HZ/25; | |
473 | add_timer(&mcfrs_timer_struct); | |
474 | } | |
475 | ||
476 | #endif /* MCFPP_DCD0 */ | |
477 | ||
478 | ||
479 | /* | |
480 | * This routine is called from the scheduler tqueue when the interrupt | |
481 | * routine has signalled that a hangup has occurred. The path of | |
482 | * hangup processing is: | |
483 | * | |
484 | * serial interrupt routine -> (scheduler tqueue) -> | |
485 | * do_serial_hangup() -> tty->hangup() -> mcfrs_hangup() | |
486 | * | |
487 | */ | |
488 | static void do_serial_hangup(void *private) | |
489 | { | |
490 | struct mcf_serial *info = (struct mcf_serial *) private; | |
491 | struct tty_struct *tty; | |
492 | ||
493 | tty = info->tty; | |
494 | if (!tty) | |
495 | return; | |
496 | ||
497 | tty_hangup(tty); | |
498 | } | |
499 | ||
500 | static int startup(struct mcf_serial * info) | |
501 | { | |
502 | volatile unsigned char *uartp; | |
503 | unsigned long flags; | |
504 | ||
505 | if (info->flags & ASYNC_INITIALIZED) | |
506 | return 0; | |
507 | ||
508 | if (!info->xmit_buf) { | |
509 | info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL); | |
510 | if (!info->xmit_buf) | |
511 | return -ENOMEM; | |
512 | } | |
513 | ||
514 | local_irq_save(flags); | |
515 | ||
516 | #ifdef SERIAL_DEBUG_OPEN | |
517 | printk("starting up ttyS%d (irq %d)...\n", info->line, info->irq); | |
518 | #endif | |
519 | ||
520 | /* | |
521 | * Reset UART, get it into known state... | |
522 | */ | |
523 | uartp = info->addr; | |
524 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */ | |
525 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */ | |
526 | mcfrs_setsignals(info, 1, 1); | |
527 | ||
528 | if (info->tty) | |
529 | clear_bit(TTY_IO_ERROR, &info->tty->flags); | |
530 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; | |
531 | ||
532 | /* | |
533 | * and set the speed of the serial port | |
534 | */ | |
535 | mcfrs_change_speed(info); | |
536 | ||
537 | /* | |
538 | * Lastly enable the UART transmitter and receiver, and | |
539 | * interrupt enables. | |
540 | */ | |
541 | info->imr = MCFUART_UIR_RXREADY; | |
542 | uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE; | |
543 | uartp[MCFUART_UIMR] = info->imr; | |
544 | ||
545 | info->flags |= ASYNC_INITIALIZED; | |
546 | local_irq_restore(flags); | |
547 | return 0; | |
548 | } | |
549 | ||
550 | /* | |
551 | * This routine will shutdown a serial port; interrupts are disabled, and | |
552 | * DTR is dropped if the hangup on close termio flag is on. | |
553 | */ | |
554 | static void shutdown(struct mcf_serial * info) | |
555 | { | |
556 | volatile unsigned char *uartp; | |
557 | unsigned long flags; | |
558 | ||
559 | if (!(info->flags & ASYNC_INITIALIZED)) | |
560 | return; | |
561 | ||
562 | #ifdef SERIAL_DEBUG_OPEN | |
563 | printk("Shutting down serial port %d (irq %d)....\n", info->line, | |
564 | info->irq); | |
565 | #endif | |
566 | ||
567 | local_irq_save(flags); | |
568 | ||
569 | uartp = info->addr; | |
570 | uartp[MCFUART_UIMR] = 0; /* mask all interrupts */ | |
571 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */ | |
572 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */ | |
573 | ||
574 | if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) | |
575 | mcfrs_setsignals(info, 0, 0); | |
576 | ||
577 | if (info->xmit_buf) { | |
578 | free_page((unsigned long) info->xmit_buf); | |
579 | info->xmit_buf = 0; | |
580 | } | |
581 | ||
582 | if (info->tty) | |
583 | set_bit(TTY_IO_ERROR, &info->tty->flags); | |
584 | ||
585 | info->flags &= ~ASYNC_INITIALIZED; | |
586 | local_irq_restore(flags); | |
587 | } | |
588 | ||
589 | ||
590 | /* | |
591 | * This routine is called to set the UART divisor registers to match | |
592 | * the specified baud rate for a serial port. | |
593 | */ | |
594 | static void mcfrs_change_speed(struct mcf_serial *info) | |
595 | { | |
596 | volatile unsigned char *uartp; | |
597 | unsigned int baudclk, cflag; | |
598 | unsigned long flags; | |
599 | unsigned char mr1, mr2; | |
600 | int i; | |
601 | #ifdef CONFIG_M5272 | |
602 | unsigned int fraction; | |
603 | #endif | |
604 | ||
605 | if (!info->tty || !info->tty->termios) | |
606 | return; | |
607 | cflag = info->tty->termios->c_cflag; | |
608 | if (info->addr == 0) | |
609 | return; | |
610 | ||
611 | #if 0 | |
612 | printk("%s(%d): mcfrs_change_speed()\n", __FILE__, __LINE__); | |
613 | #endif | |
614 | ||
615 | i = cflag & CBAUD; | |
616 | if (i & CBAUDEX) { | |
617 | i &= ~CBAUDEX; | |
618 | if (i < 1 || i > 4) | |
619 | info->tty->termios->c_cflag &= ~CBAUDEX; | |
620 | else | |
621 | i += 15; | |
622 | } | |
623 | if (i == 0) { | |
624 | mcfrs_setsignals(info, 0, -1); | |
625 | return; | |
626 | } | |
627 | ||
628 | /* compute the baudrate clock */ | |
629 | #ifdef CONFIG_M5272 | |
630 | /* | |
631 | * For the MCF5272, also compute the baudrate fraction. | |
632 | */ | |
633 | baudclk = (MCF_BUSCLK / mcfrs_baud_table[i]) / 32; | |
634 | fraction = MCF_BUSCLK - (baudclk * 32 * mcfrs_baud_table[i]); | |
635 | fraction *= 16; | |
636 | fraction /= (32 * mcfrs_baud_table[i]); | |
637 | #else | |
638 | baudclk = ((MCF_BUSCLK / mcfrs_baud_table[i]) + 16) / 32; | |
639 | #endif | |
640 | ||
641 | info->baud = mcfrs_baud_table[i]; | |
642 | ||
643 | mr1 = MCFUART_MR1_RXIRQRDY | MCFUART_MR1_RXERRCHAR; | |
644 | mr2 = 0; | |
645 | ||
646 | switch (cflag & CSIZE) { | |
647 | case CS5: mr1 |= MCFUART_MR1_CS5; break; | |
648 | case CS6: mr1 |= MCFUART_MR1_CS6; break; | |
649 | case CS7: mr1 |= MCFUART_MR1_CS7; break; | |
650 | case CS8: | |
651 | default: mr1 |= MCFUART_MR1_CS8; break; | |
652 | } | |
653 | ||
654 | if (cflag & PARENB) { | |
655 | if (cflag & CMSPAR) { | |
656 | if (cflag & PARODD) | |
657 | mr1 |= MCFUART_MR1_PARITYMARK; | |
658 | else | |
659 | mr1 |= MCFUART_MR1_PARITYSPACE; | |
660 | } else { | |
661 | if (cflag & PARODD) | |
662 | mr1 |= MCFUART_MR1_PARITYODD; | |
663 | else | |
664 | mr1 |= MCFUART_MR1_PARITYEVEN; | |
665 | } | |
666 | } else { | |
667 | mr1 |= MCFUART_MR1_PARITYNONE; | |
668 | } | |
669 | ||
670 | if (cflag & CSTOPB) | |
671 | mr2 |= MCFUART_MR2_STOP2; | |
672 | else | |
673 | mr2 |= MCFUART_MR2_STOP1; | |
674 | ||
675 | if (cflag & CRTSCTS) { | |
676 | mr1 |= MCFUART_MR1_RXRTS; | |
677 | mr2 |= MCFUART_MR2_TXCTS; | |
678 | } | |
679 | ||
680 | if (cflag & CLOCAL) | |
681 | info->flags &= ~ASYNC_CHECK_CD; | |
682 | else | |
683 | info->flags |= ASYNC_CHECK_CD; | |
684 | ||
685 | uartp = info->addr; | |
686 | ||
687 | local_irq_save(flags); | |
688 | #if 0 | |
689 | printk("%s(%d): mr1=%x mr2=%x baudclk=%x\n", __FILE__, __LINE__, | |
690 | mr1, mr2, baudclk); | |
691 | #endif | |
692 | /* | |
693 | Note: pg 12-16 of MCF5206e User's Manual states that a | |
694 | software reset should be performed prior to changing | |
695 | UMR1,2, UCSR, UACR, bit 7 | |
696 | */ | |
697 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */ | |
698 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */ | |
699 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETMRPTR; /* reset MR pointer */ | |
700 | uartp[MCFUART_UMR] = mr1; | |
701 | uartp[MCFUART_UMR] = mr2; | |
702 | uartp[MCFUART_UBG1] = (baudclk & 0xff00) >> 8; /* set msb byte */ | |
703 | uartp[MCFUART_UBG2] = (baudclk & 0xff); /* set lsb byte */ | |
704 | #ifdef CONFIG_M5272 | |
705 | uartp[MCFUART_UFPD] = (fraction & 0xf); /* set fraction */ | |
706 | #endif | |
707 | uartp[MCFUART_UCSR] = MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER; | |
708 | uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE; | |
709 | mcfrs_setsignals(info, 1, -1); | |
710 | local_irq_restore(flags); | |
711 | return; | |
712 | } | |
713 | ||
714 | static void mcfrs_flush_chars(struct tty_struct *tty) | |
715 | { | |
716 | volatile unsigned char *uartp; | |
717 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
718 | unsigned long flags; | |
719 | ||
720 | if (serial_paranoia_check(info, tty->name, "mcfrs_flush_chars")) | |
721 | return; | |
722 | ||
723 | uartp = (volatile unsigned char *) info->addr; | |
724 | ||
725 | /* | |
726 | * re-enable receiver interrupt | |
727 | */ | |
728 | local_irq_save(flags); | |
729 | if ((!(info->imr & MCFUART_UIR_RXREADY)) && | |
730 | (info->flags & ASYNC_INITIALIZED) ) { | |
731 | info->imr |= MCFUART_UIR_RXREADY; | |
732 | uartp[MCFUART_UIMR] = info->imr; | |
733 | } | |
734 | local_irq_restore(flags); | |
735 | ||
736 | if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || | |
737 | !info->xmit_buf) | |
738 | return; | |
739 | ||
740 | /* Enable transmitter */ | |
741 | local_irq_save(flags); | |
742 | info->imr |= MCFUART_UIR_TXREADY; | |
743 | uartp[MCFUART_UIMR] = info->imr; | |
744 | local_irq_restore(flags); | |
745 | } | |
746 | ||
747 | static int mcfrs_write(struct tty_struct * tty, | |
748 | const unsigned char *buf, int count) | |
749 | { | |
750 | volatile unsigned char *uartp; | |
751 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
752 | unsigned long flags; | |
753 | int c, total = 0; | |
754 | ||
755 | #if 0 | |
756 | printk("%s(%d): mcfrs_write(tty=%x,buf=%x,count=%d)\n", | |
757 | __FILE__, __LINE__, (int)tty, (int)buf, count); | |
758 | #endif | |
759 | ||
760 | if (serial_paranoia_check(info, tty->name, "mcfrs_write")) | |
761 | return 0; | |
762 | ||
763 | if (!tty || !info->xmit_buf) | |
764 | return 0; | |
765 | ||
766 | local_save_flags(flags); | |
767 | while (1) { | |
768 | local_irq_disable(); | |
769 | c = min(count, (int) min(((int)SERIAL_XMIT_SIZE) - info->xmit_cnt - 1, | |
770 | ((int)SERIAL_XMIT_SIZE) - info->xmit_head)); | |
771 | local_irq_restore(flags); | |
772 | ||
773 | if (c <= 0) | |
774 | break; | |
775 | ||
776 | memcpy(info->xmit_buf + info->xmit_head, buf, c); | |
777 | ||
778 | local_irq_disable(); | |
779 | info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); | |
780 | info->xmit_cnt += c; | |
781 | local_irq_restore(flags); | |
782 | ||
783 | buf += c; | |
784 | count -= c; | |
785 | total += c; | |
786 | } | |
787 | ||
788 | local_irq_disable(); | |
789 | uartp = info->addr; | |
790 | info->imr |= MCFUART_UIR_TXREADY; | |
791 | uartp[MCFUART_UIMR] = info->imr; | |
792 | local_irq_restore(flags); | |
793 | ||
794 | return total; | |
795 | } | |
796 | ||
797 | static int mcfrs_write_room(struct tty_struct *tty) | |
798 | { | |
799 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
800 | int ret; | |
801 | ||
802 | if (serial_paranoia_check(info, tty->name, "mcfrs_write_room")) | |
803 | return 0; | |
804 | ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; | |
805 | if (ret < 0) | |
806 | ret = 0; | |
807 | return ret; | |
808 | } | |
809 | ||
810 | static int mcfrs_chars_in_buffer(struct tty_struct *tty) | |
811 | { | |
812 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
813 | ||
814 | if (serial_paranoia_check(info, tty->name, "mcfrs_chars_in_buffer")) | |
815 | return 0; | |
816 | return info->xmit_cnt; | |
817 | } | |
818 | ||
819 | static void mcfrs_flush_buffer(struct tty_struct *tty) | |
820 | { | |
821 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
822 | unsigned long flags; | |
823 | ||
824 | if (serial_paranoia_check(info, tty->name, "mcfrs_flush_buffer")) | |
825 | return; | |
826 | ||
827 | local_irq_save(flags); | |
828 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; | |
829 | local_irq_restore(flags); | |
830 | ||
831 | tty_wakeup(tty); | |
832 | } | |
833 | ||
834 | /* | |
835 | * ------------------------------------------------------------ | |
836 | * mcfrs_throttle() | |
837 | * | |
838 | * This routine is called by the upper-layer tty layer to signal that | |
839 | * incoming characters should be throttled. | |
840 | * ------------------------------------------------------------ | |
841 | */ | |
842 | static void mcfrs_throttle(struct tty_struct * tty) | |
843 | { | |
844 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
845 | #ifdef SERIAL_DEBUG_THROTTLE | |
846 | char buf[64]; | |
847 | ||
848 | printk("throttle %s: %d....\n", _tty_name(tty, buf), | |
849 | tty->ldisc.chars_in_buffer(tty)); | |
850 | #endif | |
851 | ||
852 | if (serial_paranoia_check(info, tty->name, "mcfrs_throttle")) | |
853 | return; | |
854 | ||
855 | if (I_IXOFF(tty)) | |
856 | info->x_char = STOP_CHAR(tty); | |
857 | ||
858 | /* Turn off RTS line (do this atomic) */ | |
859 | } | |
860 | ||
861 | static void mcfrs_unthrottle(struct tty_struct * tty) | |
862 | { | |
863 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
864 | #ifdef SERIAL_DEBUG_THROTTLE | |
865 | char buf[64]; | |
866 | ||
867 | printk("unthrottle %s: %d....\n", _tty_name(tty, buf), | |
868 | tty->ldisc.chars_in_buffer(tty)); | |
869 | #endif | |
870 | ||
871 | if (serial_paranoia_check(info, tty->name, "mcfrs_unthrottle")) | |
872 | return; | |
873 | ||
874 | if (I_IXOFF(tty)) { | |
875 | if (info->x_char) | |
876 | info->x_char = 0; | |
877 | else | |
878 | info->x_char = START_CHAR(tty); | |
879 | } | |
880 | ||
881 | /* Assert RTS line (do this atomic) */ | |
882 | } | |
883 | ||
884 | /* | |
885 | * ------------------------------------------------------------ | |
886 | * mcfrs_ioctl() and friends | |
887 | * ------------------------------------------------------------ | |
888 | */ | |
889 | ||
890 | static int get_serial_info(struct mcf_serial * info, | |
891 | struct serial_struct * retinfo) | |
892 | { | |
893 | struct serial_struct tmp; | |
894 | ||
895 | if (!retinfo) | |
896 | return -EFAULT; | |
897 | memset(&tmp, 0, sizeof(tmp)); | |
898 | tmp.type = info->type; | |
899 | tmp.line = info->line; | |
900 | tmp.port = (unsigned int) info->addr; | |
901 | tmp.irq = info->irq; | |
902 | tmp.flags = info->flags; | |
903 | tmp.baud_base = info->baud_base; | |
904 | tmp.close_delay = info->close_delay; | |
905 | tmp.closing_wait = info->closing_wait; | |
906 | tmp.custom_divisor = info->custom_divisor; | |
907 | return copy_to_user(retinfo,&tmp,sizeof(*retinfo)) ? -EFAULT : 0; | |
908 | } | |
909 | ||
910 | static int set_serial_info(struct mcf_serial * info, | |
911 | struct serial_struct * new_info) | |
912 | { | |
913 | struct serial_struct new_serial; | |
914 | struct mcf_serial old_info; | |
915 | int retval = 0; | |
916 | ||
917 | if (!new_info) | |
918 | return -EFAULT; | |
919 | if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) | |
920 | return -EFAULT; | |
921 | old_info = *info; | |
922 | ||
923 | if (!capable(CAP_SYS_ADMIN)) { | |
924 | if ((new_serial.baud_base != info->baud_base) || | |
925 | (new_serial.type != info->type) || | |
926 | (new_serial.close_delay != info->close_delay) || | |
927 | ((new_serial.flags & ~ASYNC_USR_MASK) != | |
928 | (info->flags & ~ASYNC_USR_MASK))) | |
929 | return -EPERM; | |
930 | info->flags = ((info->flags & ~ASYNC_USR_MASK) | | |
931 | (new_serial.flags & ASYNC_USR_MASK)); | |
932 | info->custom_divisor = new_serial.custom_divisor; | |
933 | goto check_and_exit; | |
934 | } | |
935 | ||
936 | if (info->count > 1) | |
937 | return -EBUSY; | |
938 | ||
939 | /* | |
940 | * OK, past this point, all the error checking has been done. | |
941 | * At this point, we start making changes..... | |
942 | */ | |
943 | ||
944 | info->baud_base = new_serial.baud_base; | |
945 | info->flags = ((info->flags & ~ASYNC_FLAGS) | | |
946 | (new_serial.flags & ASYNC_FLAGS)); | |
947 | info->type = new_serial.type; | |
948 | info->close_delay = new_serial.close_delay; | |
949 | info->closing_wait = new_serial.closing_wait; | |
950 | ||
951 | check_and_exit: | |
952 | retval = startup(info); | |
953 | return retval; | |
954 | } | |
955 | ||
956 | /* | |
957 | * get_lsr_info - get line status register info | |
958 | * | |
959 | * Purpose: Let user call ioctl() to get info when the UART physically | |
960 | * is emptied. On bus types like RS485, the transmitter must | |
961 | * release the bus after transmitting. This must be done when | |
962 | * the transmit shift register is empty, not be done when the | |
963 | * transmit holding register is empty. This functionality | |
964 | * allows an RS485 driver to be written in user space. | |
965 | */ | |
966 | static int get_lsr_info(struct mcf_serial * info, unsigned int *value) | |
967 | { | |
968 | volatile unsigned char *uartp; | |
969 | unsigned long flags; | |
970 | unsigned char status; | |
971 | ||
972 | local_irq_save(flags); | |
973 | uartp = info->addr; | |
974 | status = (uartp[MCFUART_USR] & MCFUART_USR_TXEMPTY) ? TIOCSER_TEMT : 0; | |
975 | local_irq_restore(flags); | |
976 | ||
977 | return put_user(status,value); | |
978 | } | |
979 | ||
980 | /* | |
981 | * This routine sends a break character out the serial port. | |
982 | */ | |
983 | static void send_break( struct mcf_serial * info, int duration) | |
984 | { | |
985 | volatile unsigned char *uartp; | |
986 | unsigned long flags; | |
987 | ||
988 | if (!info->addr) | |
989 | return; | |
990 | set_current_state(TASK_INTERRUPTIBLE); | |
991 | uartp = info->addr; | |
992 | ||
993 | local_irq_save(flags); | |
994 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDBREAKSTART; | |
995 | schedule_timeout(duration); | |
996 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDBREAKSTOP; | |
997 | local_irq_restore(flags); | |
998 | } | |
999 | ||
1000 | static int mcfrs_tiocmget(struct tty_struct *tty, struct file *file) | |
1001 | { | |
1002 | struct mcf_serial * info = (struct mcf_serial *)tty->driver_data; | |
1003 | ||
1004 | if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl")) | |
1005 | return -ENODEV; | |
1006 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1007 | return -EIO; | |
1008 | ||
1009 | return mcfrs_getsignals(info); | |
1010 | } | |
1011 | ||
1012 | static int mcfrs_tiocmset(struct tty_struct *tty, struct file *file, | |
1013 | unsigned int set, unsigned int clear) | |
1014 | { | |
1015 | struct mcf_serial * info = (struct mcf_serial *)tty->driver_data; | |
1016 | int rts = -1, dtr = -1; | |
1017 | ||
1018 | if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl")) | |
1019 | return -ENODEV; | |
1020 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1021 | return -EIO; | |
1022 | ||
1023 | if (set & TIOCM_RTS) | |
1024 | rts = 1; | |
1025 | if (set & TIOCM_DTR) | |
1026 | dtr = 1; | |
1027 | if (clear & TIOCM_RTS) | |
1028 | rts = 0; | |
1029 | if (clear & TIOCM_DTR) | |
1030 | dtr = 0; | |
1031 | ||
1032 | mcfrs_setsignals(info, dtr, rts); | |
1033 | ||
1034 | return 0; | |
1035 | } | |
1036 | ||
1037 | static int mcfrs_ioctl(struct tty_struct *tty, struct file * file, | |
1038 | unsigned int cmd, unsigned long arg) | |
1039 | { | |
1040 | struct mcf_serial * info = (struct mcf_serial *)tty->driver_data; | |
1041 | int retval, error; | |
1042 | ||
1043 | if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl")) | |
1044 | return -ENODEV; | |
1045 | ||
1046 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
1047 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && | |
1048 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { | |
1049 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1050 | return -EIO; | |
1051 | } | |
1052 | ||
1053 | switch (cmd) { | |
1054 | case TCSBRK: /* SVID version: non-zero arg --> no break */ | |
1055 | retval = tty_check_change(tty); | |
1056 | if (retval) | |
1057 | return retval; | |
1058 | tty_wait_until_sent(tty, 0); | |
1059 | if (!arg) | |
1060 | send_break(info, HZ/4); /* 1/4 second */ | |
1061 | return 0; | |
1062 | case TCSBRKP: /* support for POSIX tcsendbreak() */ | |
1063 | retval = tty_check_change(tty); | |
1064 | if (retval) | |
1065 | return retval; | |
1066 | tty_wait_until_sent(tty, 0); | |
1067 | send_break(info, arg ? arg*(HZ/10) : HZ/4); | |
1068 | return 0; | |
1069 | case TIOCGSOFTCAR: | |
1070 | error = put_user(C_CLOCAL(tty) ? 1 : 0, | |
1071 | (unsigned long *) arg); | |
1072 | if (error) | |
1073 | return error; | |
1074 | return 0; | |
1075 | case TIOCSSOFTCAR: | |
1076 | get_user(arg, (unsigned long *) arg); | |
1077 | tty->termios->c_cflag = | |
1078 | ((tty->termios->c_cflag & ~CLOCAL) | | |
1079 | (arg ? CLOCAL : 0)); | |
1080 | return 0; | |
1081 | case TIOCGSERIAL: | |
1082 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
1083 | sizeof(struct serial_struct))) | |
1084 | return get_serial_info(info, | |
1085 | (struct serial_struct *) arg); | |
1086 | return -EFAULT; | |
1087 | case TIOCSSERIAL: | |
1088 | return set_serial_info(info, | |
1089 | (struct serial_struct *) arg); | |
1090 | case TIOCSERGETLSR: /* Get line status register */ | |
1091 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
1092 | sizeof(unsigned int))) | |
1093 | return get_lsr_info(info, (unsigned int *) arg); | |
1094 | return -EFAULT; | |
1095 | case TIOCSERGSTRUCT: | |
1096 | error = copy_to_user((struct mcf_serial *) arg, | |
1097 | info, sizeof(struct mcf_serial)); | |
1098 | if (error) | |
1099 | return -EFAULT; | |
1100 | return 0; | |
1101 | ||
1102 | #ifdef TIOCSET422 | |
1103 | case TIOCSET422: { | |
1104 | unsigned int val; | |
1105 | get_user(val, (unsigned int *) arg); | |
1106 | mcf_setpa(MCFPP_PA11, (val ? 0 : MCFPP_PA11)); | |
1107 | break; | |
1108 | } | |
1109 | case TIOCGET422: { | |
1110 | unsigned int val; | |
1111 | val = (mcf_getpa() & MCFPP_PA11) ? 0 : 1; | |
1112 | put_user(val, (unsigned int *) arg); | |
1113 | break; | |
1114 | } | |
1115 | #endif | |
1116 | ||
1117 | default: | |
1118 | return -ENOIOCTLCMD; | |
1119 | } | |
1120 | return 0; | |
1121 | } | |
1122 | ||
1123 | static void mcfrs_set_termios(struct tty_struct *tty, struct termios *old_termios) | |
1124 | { | |
1125 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
1126 | ||
1127 | if (tty->termios->c_cflag == old_termios->c_cflag) | |
1128 | return; | |
1129 | ||
1130 | mcfrs_change_speed(info); | |
1131 | ||
1132 | if ((old_termios->c_cflag & CRTSCTS) && | |
1133 | !(tty->termios->c_cflag & CRTSCTS)) { | |
1134 | tty->hw_stopped = 0; | |
1135 | mcfrs_setsignals(info, -1, 1); | |
1136 | #if 0 | |
1137 | mcfrs_start(tty); | |
1138 | #endif | |
1139 | } | |
1140 | } | |
1141 | ||
1142 | /* | |
1143 | * ------------------------------------------------------------ | |
1144 | * mcfrs_close() | |
1145 | * | |
1146 | * This routine is called when the serial port gets closed. First, we | |
1147 | * wait for the last remaining data to be sent. Then, we unlink its | |
1148 | * S structure from the interrupt chain if necessary, and we free | |
1149 | * that IRQ if nothing is left in the chain. | |
1150 | * ------------------------------------------------------------ | |
1151 | */ | |
1152 | static void mcfrs_close(struct tty_struct *tty, struct file * filp) | |
1153 | { | |
1154 | volatile unsigned char *uartp; | |
1155 | struct mcf_serial *info = (struct mcf_serial *)tty->driver_data; | |
1156 | unsigned long flags; | |
1157 | ||
1158 | if (!info || serial_paranoia_check(info, tty->name, "mcfrs_close")) | |
1159 | return; | |
1160 | ||
1161 | local_irq_save(flags); | |
1162 | ||
1163 | if (tty_hung_up_p(filp)) { | |
1164 | local_irq_restore(flags); | |
1165 | return; | |
1166 | } | |
1167 | ||
1168 | #ifdef SERIAL_DEBUG_OPEN | |
1169 | printk("mcfrs_close ttyS%d, count = %d\n", info->line, info->count); | |
1170 | #endif | |
1171 | if ((tty->count == 1) && (info->count != 1)) { | |
1172 | /* | |
1173 | * Uh, oh. tty->count is 1, which means that the tty | |
1174 | * structure will be freed. Info->count should always | |
1175 | * be one in these conditions. If it's greater than | |
1176 | * one, we've got real problems, since it means the | |
1177 | * serial port won't be shutdown. | |
1178 | */ | |
1179 | printk("MCFRS: bad serial port count; tty->count is 1, " | |
1180 | "info->count is %d\n", info->count); | |
1181 | info->count = 1; | |
1182 | } | |
1183 | if (--info->count < 0) { | |
1184 | printk("MCFRS: bad serial port count for ttyS%d: %d\n", | |
1185 | info->line, info->count); | |
1186 | info->count = 0; | |
1187 | } | |
1188 | if (info->count) { | |
1189 | local_irq_restore(flags); | |
1190 | return; | |
1191 | } | |
1192 | info->flags |= ASYNC_CLOSING; | |
1193 | ||
1194 | /* | |
1195 | * Now we wait for the transmit buffer to clear; and we notify | |
1196 | * the line discipline to only process XON/XOFF characters. | |
1197 | */ | |
1198 | tty->closing = 1; | |
1199 | if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) | |
1200 | tty_wait_until_sent(tty, info->closing_wait); | |
1201 | ||
1202 | /* | |
1203 | * At this point we stop accepting input. To do this, we | |
1204 | * disable the receive line status interrupts, and tell the | |
1205 | * interrupt driver to stop checking the data ready bit in the | |
1206 | * line status register. | |
1207 | */ | |
1208 | info->imr &= ~MCFUART_UIR_RXREADY; | |
1209 | uartp = info->addr; | |
1210 | uartp[MCFUART_UIMR] = info->imr; | |
1211 | ||
1212 | #if 0 | |
1213 | /* FIXME: do we need to keep this enabled for console?? */ | |
1214 | if (mcfrs_console_inited && (mcfrs_console_port == info->line)) { | |
1215 | /* Do not disable the UART */ ; | |
1216 | } else | |
1217 | #endif | |
1218 | shutdown(info); | |
1219 | if (tty->driver->flush_buffer) | |
1220 | tty->driver->flush_buffer(tty); | |
1221 | tty_ldisc_flush(tty); | |
1222 | ||
1223 | tty->closing = 0; | |
1224 | info->event = 0; | |
1225 | info->tty = 0; | |
1226 | #if 0 | |
1227 | if (tty->ldisc.num != ldiscs[N_TTY].num) { | |
1228 | if (tty->ldisc.close) | |
1229 | (tty->ldisc.close)(tty); | |
1230 | tty->ldisc = ldiscs[N_TTY]; | |
1231 | tty->termios->c_line = N_TTY; | |
1232 | if (tty->ldisc.open) | |
1233 | (tty->ldisc.open)(tty); | |
1234 | } | |
1235 | #endif | |
1236 | if (info->blocked_open) { | |
1237 | if (info->close_delay) { | |
1238 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); | |
1239 | } | |
1240 | wake_up_interruptible(&info->open_wait); | |
1241 | } | |
1242 | info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); | |
1243 | wake_up_interruptible(&info->close_wait); | |
1244 | local_irq_restore(flags); | |
1245 | } | |
1246 | ||
1247 | /* | |
1248 | * mcfrs_wait_until_sent() --- wait until the transmitter is empty | |
1249 | */ | |
1250 | static void | |
1251 | mcfrs_wait_until_sent(struct tty_struct *tty, int timeout) | |
1252 | { | |
1253 | #ifdef CONFIG_M5272 | |
1254 | #define MCF5272_FIFO_SIZE 25 /* fifo size + shift reg */ | |
1255 | ||
1256 | struct mcf_serial * info = (struct mcf_serial *)tty->driver_data; | |
1257 | volatile unsigned char *uartp; | |
1258 | unsigned long orig_jiffies, fifo_time, char_time, fifo_cnt; | |
1259 | ||
1260 | if (serial_paranoia_check(info, tty->name, "mcfrs_wait_until_sent")) | |
1261 | return; | |
1262 | ||
1263 | orig_jiffies = jiffies; | |
1264 | ||
1265 | /* | |
1266 | * Set the check interval to be 1/5 of the approximate time | |
1267 | * to send the entire fifo, and make it at least 1. The check | |
1268 | * interval should also be less than the timeout. | |
1269 | * | |
1270 | * Note: we have to use pretty tight timings here to satisfy | |
1271 | * the NIST-PCTS. | |
1272 | */ | |
1273 | fifo_time = (MCF5272_FIFO_SIZE * HZ * 10) / info->baud; | |
1274 | char_time = fifo_time / 5; | |
1275 | if (char_time == 0) | |
1276 | char_time = 1; | |
1277 | if (timeout && timeout < char_time) | |
1278 | char_time = timeout; | |
1279 | ||
1280 | /* | |
1281 | * Clamp the timeout period at 2 * the time to empty the | |
1282 | * fifo. Just to be safe, set the minimum at .5 seconds. | |
1283 | */ | |
1284 | fifo_time *= 2; | |
1285 | if (fifo_time < (HZ/2)) | |
1286 | fifo_time = HZ/2; | |
1287 | if (!timeout || timeout > fifo_time) | |
1288 | timeout = fifo_time; | |
1289 | ||
1290 | /* | |
1291 | * Account for the number of bytes in the UART | |
1292 | * transmitter FIFO plus any byte being shifted out. | |
1293 | */ | |
1294 | uartp = (volatile unsigned char *) info->addr; | |
1295 | for (;;) { | |
1296 | fifo_cnt = (uartp[MCFUART_UTF] & MCFUART_UTF_TXB); | |
1297 | if ((uartp[MCFUART_USR] & (MCFUART_USR_TXREADY| | |
1298 | MCFUART_USR_TXEMPTY)) == | |
1299 | MCFUART_USR_TXREADY) | |
1300 | fifo_cnt++; | |
1301 | if (fifo_cnt == 0) | |
1302 | break; | |
1303 | msleep_interruptible(jiffies_to_msecs(char_time)); | |
1304 | if (signal_pending(current)) | |
1305 | break; | |
1306 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) | |
1307 | break; | |
1308 | } | |
1309 | #else | |
1310 | /* | |
1311 | * For the other coldfire models, assume all data has been sent | |
1312 | */ | |
1313 | #endif | |
1314 | } | |
1315 | ||
1316 | /* | |
1317 | * mcfrs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
1318 | */ | |
1319 | void mcfrs_hangup(struct tty_struct *tty) | |
1320 | { | |
1321 | struct mcf_serial * info = (struct mcf_serial *)tty->driver_data; | |
1322 | ||
1323 | if (serial_paranoia_check(info, tty->name, "mcfrs_hangup")) | |
1324 | return; | |
1325 | ||
1326 | mcfrs_flush_buffer(tty); | |
1327 | shutdown(info); | |
1328 | info->event = 0; | |
1329 | info->count = 0; | |
1330 | info->flags &= ~ASYNC_NORMAL_ACTIVE; | |
1331 | info->tty = 0; | |
1332 | wake_up_interruptible(&info->open_wait); | |
1333 | } | |
1334 | ||
1335 | /* | |
1336 | * ------------------------------------------------------------ | |
1337 | * mcfrs_open() and friends | |
1338 | * ------------------------------------------------------------ | |
1339 | */ | |
1340 | static int block_til_ready(struct tty_struct *tty, struct file * filp, | |
1341 | struct mcf_serial *info) | |
1342 | { | |
1343 | DECLARE_WAITQUEUE(wait, current); | |
1344 | int retval; | |
1345 | int do_clocal = 0; | |
1346 | ||
1347 | /* | |
1348 | * If the device is in the middle of being closed, then block | |
1349 | * until it's done, and then try again. | |
1350 | */ | |
1351 | if (info->flags & ASYNC_CLOSING) { | |
1352 | interruptible_sleep_on(&info->close_wait); | |
1353 | #ifdef SERIAL_DO_RESTART | |
1354 | if (info->flags & ASYNC_HUP_NOTIFY) | |
1355 | return -EAGAIN; | |
1356 | else | |
1357 | return -ERESTARTSYS; | |
1358 | #else | |
1359 | return -EAGAIN; | |
1360 | #endif | |
1361 | } | |
1362 | ||
1363 | /* | |
1364 | * If non-blocking mode is set, or the port is not enabled, | |
1365 | * then make the check up front and then exit. | |
1366 | */ | |
1367 | if ((filp->f_flags & O_NONBLOCK) || | |
1368 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
1369 | info->flags |= ASYNC_NORMAL_ACTIVE; | |
1370 | return 0; | |
1371 | } | |
1372 | ||
1373 | if (tty->termios->c_cflag & CLOCAL) | |
1374 | do_clocal = 1; | |
1375 | ||
1376 | /* | |
1377 | * Block waiting for the carrier detect and the line to become | |
1378 | * free (i.e., not in use by the callout). While we are in | |
1379 | * this loop, info->count is dropped by one, so that | |
1380 | * mcfrs_close() knows when to free things. We restore it upon | |
1381 | * exit, either normal or abnormal. | |
1382 | */ | |
1383 | retval = 0; | |
1384 | add_wait_queue(&info->open_wait, &wait); | |
1385 | #ifdef SERIAL_DEBUG_OPEN | |
1386 | printk("block_til_ready before block: ttyS%d, count = %d\n", | |
1387 | info->line, info->count); | |
1388 | #endif | |
1389 | info->count--; | |
1390 | info->blocked_open++; | |
1391 | while (1) { | |
1392 | local_irq_disable(); | |
1393 | mcfrs_setsignals(info, 1, 1); | |
1394 | local_irq_enable(); | |
1395 | current->state = TASK_INTERRUPTIBLE; | |
1396 | if (tty_hung_up_p(filp) || | |
1397 | !(info->flags & ASYNC_INITIALIZED)) { | |
1398 | #ifdef SERIAL_DO_RESTART | |
1399 | if (info->flags & ASYNC_HUP_NOTIFY) | |
1400 | retval = -EAGAIN; | |
1401 | else | |
1402 | retval = -ERESTARTSYS; | |
1403 | #else | |
1404 | retval = -EAGAIN; | |
1405 | #endif | |
1406 | break; | |
1407 | } | |
1408 | if (!(info->flags & ASYNC_CLOSING) && | |
1409 | (do_clocal || (mcfrs_getsignals(info) & TIOCM_CD))) | |
1410 | break; | |
1411 | if (signal_pending(current)) { | |
1412 | retval = -ERESTARTSYS; | |
1413 | break; | |
1414 | } | |
1415 | #ifdef SERIAL_DEBUG_OPEN | |
1416 | printk("block_til_ready blocking: ttyS%d, count = %d\n", | |
1417 | info->line, info->count); | |
1418 | #endif | |
1419 | schedule(); | |
1420 | } | |
1421 | current->state = TASK_RUNNING; | |
1422 | remove_wait_queue(&info->open_wait, &wait); | |
1423 | if (!tty_hung_up_p(filp)) | |
1424 | info->count++; | |
1425 | info->blocked_open--; | |
1426 | #ifdef SERIAL_DEBUG_OPEN | |
1427 | printk("block_til_ready after blocking: ttyS%d, count = %d\n", | |
1428 | info->line, info->count); | |
1429 | #endif | |
1430 | if (retval) | |
1431 | return retval; | |
1432 | info->flags |= ASYNC_NORMAL_ACTIVE; | |
1433 | return 0; | |
1434 | } | |
1435 | ||
1436 | /* | |
1437 | * This routine is called whenever a serial port is opened. It | |
1438 | * enables interrupts for a serial port, linking in its structure into | |
1439 | * the IRQ chain. It also performs the serial-specific | |
1440 | * initialization for the tty structure. | |
1441 | */ | |
1442 | int mcfrs_open(struct tty_struct *tty, struct file * filp) | |
1443 | { | |
1444 | struct mcf_serial *info; | |
1445 | int retval, line; | |
1446 | ||
1447 | line = tty->index; | |
1448 | if ((line < 0) || (line >= NR_PORTS)) | |
1449 | return -ENODEV; | |
1450 | info = mcfrs_table + line; | |
1451 | if (serial_paranoia_check(info, tty->name, "mcfrs_open")) | |
1452 | return -ENODEV; | |
1453 | #ifdef SERIAL_DEBUG_OPEN | |
1454 | printk("mcfrs_open %s, count = %d\n", tty->name, info->count); | |
1455 | #endif | |
1456 | info->count++; | |
1457 | tty->driver_data = info; | |
1458 | info->tty = tty; | |
1459 | ||
1460 | /* | |
1461 | * Start up serial port | |
1462 | */ | |
1463 | retval = startup(info); | |
1464 | if (retval) | |
1465 | return retval; | |
1466 | ||
1467 | retval = block_til_ready(tty, filp, info); | |
1468 | if (retval) { | |
1469 | #ifdef SERIAL_DEBUG_OPEN | |
1470 | printk("mcfrs_open returning after block_til_ready with %d\n", | |
1471 | retval); | |
1472 | #endif | |
1473 | return retval; | |
1474 | } | |
1475 | ||
1476 | #ifdef SERIAL_DEBUG_OPEN | |
1477 | printk("mcfrs_open %s successful...\n", tty->name); | |
1478 | #endif | |
1479 | return 0; | |
1480 | } | |
1481 | ||
1482 | /* | |
1483 | * Based on the line number set up the internal interrupt stuff. | |
1484 | */ | |
1485 | static void mcfrs_irqinit(struct mcf_serial *info) | |
1486 | { | |
1487 | #if defined(CONFIG_M5272) | |
1488 | volatile unsigned long *icrp; | |
1489 | volatile unsigned long *portp; | |
1490 | volatile unsigned char *uartp; | |
1491 | ||
1492 | uartp = info->addr; | |
1493 | icrp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_ICR2); | |
1494 | ||
1495 | switch (info->line) { | |
1496 | case 0: | |
1497 | *icrp = 0xe0000000; | |
1498 | break; | |
1499 | case 1: | |
1500 | *icrp = 0x0e000000; | |
1501 | break; | |
1502 | default: | |
1503 | printk("MCFRS: don't know how to handle UART %d interrupt?\n", | |
1504 | info->line); | |
1505 | return; | |
1506 | } | |
1507 | ||
1508 | /* Enable the output lines for the serial ports */ | |
1509 | portp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_PBCNT); | |
1510 | *portp = (*portp & ~0x000000ff) | 0x00000055; | |
1511 | portp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_PDCNT); | |
1512 | *portp = (*portp & ~0x000003fc) | 0x000002a8; | |
1513 | #elif defined(CONFIG_M527x) || defined(CONFIG_M528x) | |
1514 | volatile unsigned char *icrp, *uartp; | |
1515 | volatile unsigned long *imrp; | |
1516 | ||
1517 | uartp = info->addr; | |
1518 | ||
1519 | icrp = (volatile unsigned char *) (MCF_MBAR + MCFICM_INTC0 + | |
1520 | MCFINTC_ICR0 + MCFINT_UART0 + info->line); | |
1521 | *icrp = 0x33; /* UART0 with level 6, priority 3 */ | |
1522 | ||
1523 | imrp = (volatile unsigned long *) (MCF_MBAR + MCFICM_INTC0 + | |
1524 | MCFINTC_IMRL); | |
1525 | *imrp &= ~((1 << (info->irq - MCFINT_VECBASE)) | 1); | |
1526 | #else | |
1527 | volatile unsigned char *icrp, *uartp; | |
1528 | ||
1529 | switch (info->line) { | |
1530 | case 0: | |
1531 | icrp = (volatile unsigned char *) (MCF_MBAR + MCFSIM_UART1ICR); | |
1532 | *icrp = /*MCFSIM_ICR_AUTOVEC |*/ MCFSIM_ICR_LEVEL6 | | |
1533 | MCFSIM_ICR_PRI1; | |
1534 | mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_UART1); | |
1535 | break; | |
1536 | case 1: | |
1537 | icrp = (volatile unsigned char *) (MCF_MBAR + MCFSIM_UART2ICR); | |
1538 | *icrp = /*MCFSIM_ICR_AUTOVEC |*/ MCFSIM_ICR_LEVEL6 | | |
1539 | MCFSIM_ICR_PRI2; | |
1540 | mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_UART2); | |
1541 | break; | |
1542 | default: | |
1543 | printk("MCFRS: don't know how to handle UART %d interrupt?\n", | |
1544 | info->line); | |
1545 | return; | |
1546 | } | |
1547 | ||
1548 | uartp = info->addr; | |
1549 | uartp[MCFUART_UIVR] = info->irq; | |
1550 | #endif | |
1551 | ||
1552 | /* Clear mask, so no surprise interrupts. */ | |
1553 | uartp[MCFUART_UIMR] = 0; | |
1554 | ||
1555 | if (request_irq(info->irq, mcfrs_interrupt, SA_INTERRUPT, | |
1556 | "ColdFire UART", NULL)) { | |
1557 | printk("MCFRS: Unable to attach ColdFire UART %d interrupt " | |
1558 | "vector=%d\n", info->line, info->irq); | |
1559 | } | |
1560 | ||
1561 | return; | |
1562 | } | |
1563 | ||
1564 | ||
1565 | char *mcfrs_drivername = "ColdFire internal UART serial driver version 1.00\n"; | |
1566 | ||
1567 | ||
1568 | /* | |
1569 | * Serial stats reporting... | |
1570 | */ | |
1571 | int mcfrs_readproc(char *page, char **start, off_t off, int count, | |
1572 | int *eof, void *data) | |
1573 | { | |
1574 | struct mcf_serial *info; | |
1575 | char str[20]; | |
1576 | int len, sigs, i; | |
1577 | ||
1578 | len = sprintf(page, mcfrs_drivername); | |
1579 | for (i = 0; (i < NR_PORTS); i++) { | |
1580 | info = &mcfrs_table[i]; | |
1581 | len += sprintf((page + len), "%d: port:%x irq=%d baud:%d ", | |
1582 | i, (unsigned int) info->addr, info->irq, info->baud); | |
1583 | if (info->stats.rx || info->stats.tx) | |
1584 | len += sprintf((page + len), "tx:%d rx:%d ", | |
1585 | info->stats.tx, info->stats.rx); | |
1586 | if (info->stats.rxframing) | |
1587 | len += sprintf((page + len), "fe:%d ", | |
1588 | info->stats.rxframing); | |
1589 | if (info->stats.rxparity) | |
1590 | len += sprintf((page + len), "pe:%d ", | |
1591 | info->stats.rxparity); | |
1592 | if (info->stats.rxbreak) | |
1593 | len += sprintf((page + len), "brk:%d ", | |
1594 | info->stats.rxbreak); | |
1595 | if (info->stats.rxoverrun) | |
1596 | len += sprintf((page + len), "oe:%d ", | |
1597 | info->stats.rxoverrun); | |
1598 | ||
1599 | str[0] = str[1] = 0; | |
1600 | if ((sigs = mcfrs_getsignals(info))) { | |
1601 | if (sigs & TIOCM_RTS) | |
1602 | strcat(str, "|RTS"); | |
1603 | if (sigs & TIOCM_CTS) | |
1604 | strcat(str, "|CTS"); | |
1605 | if (sigs & TIOCM_DTR) | |
1606 | strcat(str, "|DTR"); | |
1607 | if (sigs & TIOCM_CD) | |
1608 | strcat(str, "|CD"); | |
1609 | } | |
1610 | ||
1611 | len += sprintf((page + len), "%s\n", &str[1]); | |
1612 | } | |
1613 | ||
1614 | return(len); | |
1615 | } | |
1616 | ||
1617 | ||
1618 | /* Finally, routines used to initialize the serial driver. */ | |
1619 | ||
1620 | static void show_serial_version(void) | |
1621 | { | |
1622 | printk(mcfrs_drivername); | |
1623 | } | |
1624 | ||
1625 | static struct tty_operations mcfrs_ops = { | |
1626 | .open = mcfrs_open, | |
1627 | .close = mcfrs_close, | |
1628 | .write = mcfrs_write, | |
1629 | .flush_chars = mcfrs_flush_chars, | |
1630 | .write_room = mcfrs_write_room, | |
1631 | .chars_in_buffer = mcfrs_chars_in_buffer, | |
1632 | .flush_buffer = mcfrs_flush_buffer, | |
1633 | .ioctl = mcfrs_ioctl, | |
1634 | .throttle = mcfrs_throttle, | |
1635 | .unthrottle = mcfrs_unthrottle, | |
1636 | .set_termios = mcfrs_set_termios, | |
1637 | .stop = mcfrs_stop, | |
1638 | .start = mcfrs_start, | |
1639 | .hangup = mcfrs_hangup, | |
1640 | .read_proc = mcfrs_readproc, | |
1641 | .wait_until_sent = mcfrs_wait_until_sent, | |
1642 | .tiocmget = mcfrs_tiocmget, | |
1643 | .tiocmset = mcfrs_tiocmset, | |
1644 | }; | |
1645 | ||
1646 | /* mcfrs_init inits the driver */ | |
1647 | static int __init | |
1648 | mcfrs_init(void) | |
1649 | { | |
1650 | struct mcf_serial *info; | |
1651 | unsigned long flags; | |
1652 | int i; | |
1653 | ||
1654 | /* Setup base handler, and timer table. */ | |
1655 | #ifdef MCFPP_DCD0 | |
1656 | init_timer(&mcfrs_timer_struct); | |
1657 | mcfrs_timer_struct.function = mcfrs_timer; | |
1658 | mcfrs_timer_struct.data = 0; | |
1659 | mcfrs_timer_struct.expires = jiffies + HZ/25; | |
1660 | add_timer(&mcfrs_timer_struct); | |
1661 | mcfrs_ppstatus = mcf_getppdata() & (MCFPP_DCD0 | MCFPP_DCD1); | |
1662 | #endif | |
1663 | mcfrs_serial_driver = alloc_tty_driver(NR_PORTS); | |
1664 | if (!mcfrs_serial_driver) | |
1665 | return -ENOMEM; | |
1666 | ||
1667 | show_serial_version(); | |
1668 | ||
1669 | /* Initialize the tty_driver structure */ | |
1670 | mcfrs_serial_driver->owner = THIS_MODULE; | |
1671 | mcfrs_serial_driver->name = "ttyS"; | |
1672 | mcfrs_serial_driver->devfs_name = "ttys/"; | |
1673 | mcfrs_serial_driver->driver_name = "serial"; | |
1674 | mcfrs_serial_driver->major = TTY_MAJOR; | |
1675 | mcfrs_serial_driver->minor_start = 64; | |
1676 | mcfrs_serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
1677 | mcfrs_serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
1678 | mcfrs_serial_driver->init_termios = tty_std_termios; | |
1679 | ||
1680 | mcfrs_serial_driver->init_termios.c_cflag = | |
1681 | mcfrs_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL; | |
1682 | mcfrs_serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
1683 | ||
1684 | tty_set_operations(mcfrs_serial_driver, &mcfrs_ops); | |
1685 | ||
1686 | if (tty_register_driver(mcfrs_serial_driver)) { | |
1687 | printk("MCFRS: Couldn't register serial driver\n"); | |
1688 | put_tty_driver(mcfrs_serial_driver); | |
1689 | return(-EBUSY); | |
1690 | } | |
1691 | ||
1692 | local_irq_save(flags); | |
1693 | ||
1694 | /* | |
1695 | * Configure all the attached serial ports. | |
1696 | */ | |
1697 | for (i = 0, info = mcfrs_table; (i < NR_PORTS); i++, info++) { | |
1698 | info->magic = SERIAL_MAGIC; | |
1699 | info->line = i; | |
1700 | info->tty = 0; | |
1701 | info->custom_divisor = 16; | |
1702 | info->close_delay = 50; | |
1703 | info->closing_wait = 3000; | |
1704 | info->x_char = 0; | |
1705 | info->event = 0; | |
1706 | info->count = 0; | |
1707 | info->blocked_open = 0; | |
1708 | INIT_WORK(&info->tqueue, mcfrs_offintr, info); | |
1709 | INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info); | |
1710 | init_waitqueue_head(&info->open_wait); | |
1711 | init_waitqueue_head(&info->close_wait); | |
1712 | ||
1713 | info->imr = 0; | |
1714 | mcfrs_setsignals(info, 0, 0); | |
1715 | mcfrs_irqinit(info); | |
1716 | ||
1717 | printk("ttyS%d at 0x%04x (irq = %d)", info->line, | |
1718 | (unsigned int) info->addr, info->irq); | |
1719 | printk(" is a builtin ColdFire UART\n"); | |
1720 | } | |
1721 | ||
1722 | local_irq_restore(flags); | |
1723 | return 0; | |
1724 | } | |
1725 | ||
1726 | module_init(mcfrs_init); | |
1727 | ||
1728 | /****************************************************************************/ | |
1729 | /* Serial Console */ | |
1730 | /****************************************************************************/ | |
1731 | ||
1732 | /* | |
1733 | * Quick and dirty UART initialization, for console output. | |
1734 | */ | |
1735 | ||
1736 | void mcfrs_init_console(void) | |
1737 | { | |
1738 | volatile unsigned char *uartp; | |
1739 | unsigned int clk; | |
1740 | ||
1741 | /* | |
1742 | * Reset UART, get it into known state... | |
1743 | */ | |
1744 | uartp = (volatile unsigned char *) (MCF_MBAR + | |
1745 | (mcfrs_console_port ? MCFUART_BASE2 : MCFUART_BASE1)); | |
1746 | ||
1747 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */ | |
1748 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */ | |
1749 | uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETMRPTR; /* reset MR pointer */ | |
1750 | ||
1751 | /* | |
1752 | * Set port for defined baud , 8 data bits, 1 stop bit, no parity. | |
1753 | */ | |
1754 | uartp[MCFUART_UMR] = MCFUART_MR1_PARITYNONE | MCFUART_MR1_CS8; | |
1755 | uartp[MCFUART_UMR] = MCFUART_MR2_STOP1; | |
1756 | ||
1757 | clk = ((MCF_BUSCLK / mcfrs_console_baud) + 16) / 32; /* set baud */ | |
1758 | uartp[MCFUART_UBG1] = (clk & 0xff00) >> 8; /* set msb baud */ | |
1759 | uartp[MCFUART_UBG2] = (clk & 0xff); /* set lsb baud */ | |
1760 | ||
1761 | uartp[MCFUART_UCSR] = MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER; | |
1762 | uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE; | |
1763 | ||
1764 | mcfrs_console_inited++; | |
1765 | return; | |
1766 | } | |
1767 | ||
1768 | ||
1769 | /* | |
1770 | * Setup for console. Argument comes from the boot command line. | |
1771 | */ | |
1772 | ||
1773 | int mcfrs_console_setup(struct console *cp, char *arg) | |
1774 | { | |
1775 | int i, n = CONSOLE_BAUD_RATE; | |
1776 | ||
1777 | if (!cp) | |
1778 | return(-1); | |
1779 | ||
1780 | if (!strncmp(cp->name, "ttyS", 4)) | |
1781 | mcfrs_console_port = cp->index; | |
1782 | else if (!strncmp(cp->name, "cua", 3)) | |
1783 | mcfrs_console_port = cp->index; | |
1784 | else | |
1785 | return(-1); | |
1786 | ||
1787 | if (arg) | |
1788 | n = simple_strtoul(arg,NULL,0); | |
1789 | for (i = 0; i < MCFRS_BAUD_TABLE_SIZE; i++) | |
1790 | if (mcfrs_baud_table[i] == n) | |
1791 | break; | |
1792 | if (i < MCFRS_BAUD_TABLE_SIZE) { | |
1793 | mcfrs_console_baud = n; | |
1794 | mcfrs_console_cbaud = 0; | |
1795 | if (i > 15) { | |
1796 | mcfrs_console_cbaud |= CBAUDEX; | |
1797 | i -= 15; | |
1798 | } | |
1799 | mcfrs_console_cbaud |= i; | |
1800 | } | |
1801 | mcfrs_init_console(); /* make sure baud rate changes */ | |
1802 | return(0); | |
1803 | } | |
1804 | ||
1805 | ||
1806 | static struct tty_driver *mcfrs_console_device(struct console *c, int *index) | |
1807 | { | |
1808 | *index = c->index; | |
1809 | return mcfrs_serial_driver; | |
1810 | } | |
1811 | ||
1812 | ||
1813 | /* | |
1814 | * Output a single character, using UART polled mode. | |
1815 | * This is used for console output. | |
1816 | */ | |
1817 | ||
1818 | void mcfrs_put_char(char ch) | |
1819 | { | |
1820 | volatile unsigned char *uartp; | |
1821 | unsigned long flags; | |
1822 | int i; | |
1823 | ||
1824 | uartp = (volatile unsigned char *) (MCF_MBAR + | |
1825 | (mcfrs_console_port ? MCFUART_BASE2 : MCFUART_BASE1)); | |
1826 | ||
1827 | local_irq_save(flags); | |
1828 | for (i = 0; (i < 0x10000); i++) { | |
1829 | if (uartp[MCFUART_USR] & MCFUART_USR_TXREADY) | |
1830 | break; | |
1831 | } | |
1832 | if (i < 0x10000) { | |
1833 | uartp[MCFUART_UTB] = ch; | |
1834 | for (i = 0; (i < 0x10000); i++) | |
1835 | if (uartp[MCFUART_USR] & MCFUART_USR_TXEMPTY) | |
1836 | break; | |
1837 | } | |
1838 | if (i >= 0x10000) | |
1839 | mcfrs_init_console(); /* try and get it back */ | |
1840 | local_irq_restore(flags); | |
1841 | ||
1842 | return; | |
1843 | } | |
1844 | ||
1845 | ||
1846 | /* | |
1847 | * rs_console_write is registered for printk output. | |
1848 | */ | |
1849 | ||
1850 | void mcfrs_console_write(struct console *cp, const char *p, unsigned len) | |
1851 | { | |
1852 | if (!mcfrs_console_inited) | |
1853 | mcfrs_init_console(); | |
1854 | while (len-- > 0) { | |
1855 | if (*p == '\n') | |
1856 | mcfrs_put_char('\r'); | |
1857 | mcfrs_put_char(*p++); | |
1858 | } | |
1859 | } | |
1860 | ||
1861 | /* | |
1862 | * declare our consoles | |
1863 | */ | |
1864 | ||
1865 | struct console mcfrs_console = { | |
1866 | .name = "ttyS", | |
1867 | .write = mcfrs_console_write, | |
1868 | .device = mcfrs_console_device, | |
1869 | .setup = mcfrs_console_setup, | |
1870 | .flags = CON_PRINTBUFFER, | |
1871 | .index = -1, | |
1872 | }; | |
1873 | ||
1874 | static int __init mcfrs_console_init(void) | |
1875 | { | |
1876 | register_console(&mcfrs_console); | |
1877 | return 0; | |
1878 | } | |
1879 | ||
1880 | console_initcall(mcfrs_console_init); | |
1881 | ||
1882 | /****************************************************************************/ |