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1da177e4 LT |
1 | /* 68328serial.c: Serial port driver for 68328 microcontroller |
2 | * | |
3 | * Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu> | |
4 | * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> | |
5 | * Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org> | |
6 | * Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com> | |
7 | * Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com> | |
8 | * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com> | |
9 | * | |
10 | * VZ Support/Fixes Evan Stawnyczy <e@lineo.ca> | |
11 | * Multiple UART support Daniel Potts <danielp@cse.unsw.edu.au> | |
12 | * Power management support Daniel Potts <danielp@cse.unsw.edu.au> | |
13 | * VZ Second Serial Port enable Phil Wilshire | |
14 | * 2.4/2.5 port David McCullough | |
15 | */ | |
16 | ||
17 | #include <asm/dbg.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/signal.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/timer.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/tty.h> | |
25 | #include <linux/tty_flip.h> | |
26 | #include <linux/config.h> | |
27 | #include <linux/major.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/fcntl.h> | |
30 | #include <linux/mm.h> | |
31 | #include <linux/kernel.h> | |
32 | #include <linux/console.h> | |
33 | #include <linux/reboot.h> | |
34 | #include <linux/keyboard.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/pm.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/delay.h> |
44 | #include <asm/uaccess.h> | |
45 | ||
46 | /* (es) */ | |
47 | /* note: perhaps we can murge these files, so that you can just | |
48 | * define 1 of them, and they can sort that out for themselves | |
49 | */ | |
50 | #if defined(CONFIG_M68EZ328) | |
51 | #include <asm/MC68EZ328.h> | |
52 | #else | |
53 | #if defined(CONFIG_M68VZ328) | |
54 | #include <asm/MC68VZ328.h> | |
55 | #else | |
56 | #include <asm/MC68328.h> | |
57 | #endif /* CONFIG_M68VZ328 */ | |
58 | #endif /* CONFIG_M68EZ328 */ | |
59 | ||
60 | #include "68328serial.h" | |
61 | ||
62 | /* Turn off usage of real serial interrupt code, to "support" Copilot */ | |
63 | #ifdef CONFIG_XCOPILOT_BUGS | |
64 | #undef USE_INTS | |
65 | #else | |
66 | #define USE_INTS | |
67 | #endif | |
68 | ||
69 | static struct m68k_serial m68k_soft[NR_PORTS]; | |
70 | struct m68k_serial *IRQ_ports[NR_IRQS]; | |
71 | ||
72 | static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS; | |
73 | ||
74 | /* multiple ports are contiguous in memory */ | |
75 | m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR; | |
76 | ||
77 | struct tty_struct m68k_ttys; | |
78 | struct m68k_serial *m68k_consinfo = 0; | |
79 | ||
80 | #define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */ | |
81 | ||
82 | #ifdef CONFIG_CONSOLE | |
83 | extern wait_queue_head_t keypress_wait; | |
84 | #endif | |
85 | ||
86 | struct tty_driver *serial_driver; | |
87 | ||
88 | /* serial subtype definitions */ | |
89 | #define SERIAL_TYPE_NORMAL 1 | |
90 | ||
91 | /* number of characters left in xmit buffer before we ask for more */ | |
92 | #define WAKEUP_CHARS 256 | |
93 | ||
94 | /* Debugging... DEBUG_INTR is bad to use when one of the zs | |
95 | * lines is your console ;( | |
96 | */ | |
97 | #undef SERIAL_DEBUG_INTR | |
98 | #undef SERIAL_DEBUG_OPEN | |
99 | #undef SERIAL_DEBUG_FLOW | |
100 | ||
101 | #define RS_ISR_PASS_LIMIT 256 | |
102 | ||
103 | #define _INLINE_ inline | |
104 | ||
105 | static void change_speed(struct m68k_serial *info); | |
106 | ||
107 | /* | |
108 | * Setup for console. Argument comes from the boot command line. | |
109 | */ | |
110 | ||
111 | #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ) | |
112 | #define CONSOLE_BAUD_RATE 115200 | |
113 | #define DEFAULT_CBAUD B115200 | |
114 | #else | |
115 | /* (es) */ | |
116 | /* note: this is messy, but it works, again, perhaps defined somewhere else?*/ | |
117 | #ifdef CONFIG_M68VZ328 | |
118 | #define CONSOLE_BAUD_RATE 19200 | |
119 | #define DEFAULT_CBAUD B19200 | |
120 | #endif | |
121 | /* (/es) */ | |
122 | #endif | |
123 | ||
124 | #ifndef CONSOLE_BAUD_RATE | |
125 | #define CONSOLE_BAUD_RATE 9600 | |
126 | #define DEFAULT_CBAUD B9600 | |
127 | #endif | |
128 | ||
129 | ||
130 | static int m68328_console_initted = 0; | |
131 | static int m68328_console_baud = CONSOLE_BAUD_RATE; | |
132 | static int m68328_console_cbaud = DEFAULT_CBAUD; | |
133 | ||
134 | ||
135 | /* | |
136 | * tmp_buf is used as a temporary buffer by serial_write. We need to | |
137 | * lock it in case the memcpy_fromfs blocks while swapping in a page, | |
138 | * and some other program tries to do a serial write at the same time. | |
139 | * Since the lock will only come under contention when the system is | |
140 | * swapping and available memory is low, it makes sense to share one | |
141 | * buffer across all the serial ports, since it significantly saves | |
142 | * memory if large numbers of serial ports are open. | |
143 | */ | |
144 | static unsigned char tmp_buf[SERIAL_XMIT_SIZE]; /* This is cheating */ | |
145 | DECLARE_MUTEX(tmp_buf_sem); | |
146 | ||
147 | static inline int serial_paranoia_check(struct m68k_serial *info, | |
148 | char *name, const char *routine) | |
149 | { | |
150 | #ifdef SERIAL_PARANOIA_CHECK | |
151 | static const char *badmagic = | |
152 | "Warning: bad magic number for serial struct %s in %s\n"; | |
153 | static const char *badinfo = | |
154 | "Warning: null m68k_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 | * This is used to figure out the divisor speeds and the timeouts | |
170 | */ | |
171 | static int baud_table[] = { | |
172 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, | |
173 | 9600, 19200, 38400, 57600, 115200, 0 }; | |
174 | ||
175 | #define BAUD_TABLE_SIZE (sizeof(baud_table)/sizeof(baud_table[0])) | |
176 | ||
177 | /* Sets or clears DTR/RTS on the requested line */ | |
178 | static inline void m68k_rtsdtr(struct m68k_serial *ss, int set) | |
179 | { | |
180 | if (set) { | |
181 | /* set the RTS/CTS line */ | |
182 | } else { | |
183 | /* clear it */ | |
184 | } | |
185 | return; | |
186 | } | |
187 | ||
188 | /* Utility routines */ | |
189 | static inline int get_baud(struct m68k_serial *ss) | |
190 | { | |
191 | unsigned long result = 115200; | |
192 | unsigned short int baud = uart_addr[ss->line].ubaud; | |
193 | if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400; | |
194 | result >>= GET_FIELD(baud, UBAUD_DIVIDE); | |
195 | ||
196 | return result; | |
197 | } | |
198 | ||
199 | /* | |
200 | * ------------------------------------------------------------ | |
201 | * rs_stop() and rs_start() | |
202 | * | |
203 | * This routines are called before setting or resetting tty->stopped. | |
204 | * They enable or disable transmitter interrupts, as necessary. | |
205 | * ------------------------------------------------------------ | |
206 | */ | |
207 | static void rs_stop(struct tty_struct *tty) | |
208 | { | |
209 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
210 | m68328_uart *uart = &uart_addr[info->line]; | |
211 | unsigned long flags; | |
212 | ||
213 | if (serial_paranoia_check(info, tty->name, "rs_stop")) | |
214 | return; | |
215 | ||
216 | save_flags(flags); cli(); | |
217 | uart->ustcnt &= ~USTCNT_TXEN; | |
218 | restore_flags(flags); | |
219 | } | |
220 | ||
221 | static void rs_put_char(char ch) | |
222 | { | |
223 | int flags, loops = 0; | |
224 | ||
225 | save_flags(flags); cli(); | |
226 | ||
227 | while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) { | |
228 | loops++; | |
229 | udelay(5); | |
230 | } | |
231 | ||
232 | UTX_TXDATA = ch; | |
233 | udelay(5); | |
234 | restore_flags(flags); | |
235 | } | |
236 | ||
237 | static void rs_start(struct tty_struct *tty) | |
238 | { | |
239 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
240 | m68328_uart *uart = &uart_addr[info->line]; | |
241 | unsigned long flags; | |
242 | ||
243 | if (serial_paranoia_check(info, tty->name, "rs_start")) | |
244 | return; | |
245 | ||
246 | save_flags(flags); cli(); | |
247 | if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) { | |
248 | #ifdef USE_INTS | |
249 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
250 | #else | |
251 | uart->ustcnt |= USTCNT_TXEN; | |
252 | #endif | |
253 | } | |
254 | restore_flags(flags); | |
255 | } | |
256 | ||
257 | /* Drop into either the boot monitor or kadb upon receiving a break | |
258 | * from keyboard/console input. | |
259 | */ | |
260 | static void batten_down_hatches(void) | |
261 | { | |
262 | /* Drop into the debugger */ | |
263 | } | |
264 | ||
265 | static _INLINE_ void status_handle(struct m68k_serial *info, unsigned short status) | |
266 | { | |
267 | #if 0 | |
268 | if(status & DCD) { | |
269 | if((info->tty->termios->c_cflag & CRTSCTS) && | |
270 | ((info->curregs[3] & AUTO_ENAB)==0)) { | |
271 | info->curregs[3] |= AUTO_ENAB; | |
272 | info->pendregs[3] |= AUTO_ENAB; | |
273 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
274 | } | |
275 | } else { | |
276 | if((info->curregs[3] & AUTO_ENAB)) { | |
277 | info->curregs[3] &= ~AUTO_ENAB; | |
278 | info->pendregs[3] &= ~AUTO_ENAB; | |
279 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
280 | } | |
281 | } | |
282 | #endif | |
283 | /* If this is console input and this is a | |
284 | * 'break asserted' status change interrupt | |
285 | * see if we can drop into the debugger | |
286 | */ | |
287 | if((status & URX_BREAK) && info->break_abort) | |
288 | batten_down_hatches(); | |
289 | return; | |
290 | } | |
291 | ||
292 | static _INLINE_ void receive_chars(struct m68k_serial *info, struct pt_regs *regs, unsigned short rx) | |
293 | { | |
294 | struct tty_struct *tty = info->tty; | |
295 | m68328_uart *uart = &uart_addr[info->line]; | |
296 | unsigned char ch; | |
297 | ||
298 | /* | |
299 | * This do { } while() loop will get ALL chars out of Rx FIFO | |
300 | */ | |
301 | #ifndef CONFIG_XCOPILOT_BUGS | |
302 | do { | |
303 | #endif | |
304 | ch = GET_FIELD(rx, URX_RXDATA); | |
305 | ||
306 | if(info->is_cons) { | |
307 | if(URX_BREAK & rx) { /* whee, break received */ | |
308 | status_handle(info, rx); | |
309 | return; | |
310 | #ifdef CONFIG_MAGIC_SYSRQ | |
311 | } else if (ch == 0x10) { /* ^P */ | |
312 | show_state(); | |
313 | show_free_areas(); | |
314 | show_buffers(); | |
315 | /* show_net_buffers(); */ | |
316 | return; | |
317 | } else if (ch == 0x12) { /* ^R */ | |
804ebf46 | 318 | emergency_restart(); |
1da177e4 LT |
319 | return; |
320 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
321 | } | |
322 | /* It is a 'keyboard interrupt' ;-) */ | |
323 | #ifdef CONFIG_CONSOLE | |
324 | wake_up(&keypress_wait); | |
325 | #endif | |
326 | } | |
327 | ||
328 | if(!tty) | |
329 | goto clear_and_exit; | |
330 | ||
331 | /* | |
332 | * Make sure that we do not overflow the buffer | |
333 | */ | |
334 | if (tty->flip.count >= TTY_FLIPBUF_SIZE) { | |
335 | schedule_work(&tty->flip.work); | |
336 | return; | |
337 | } | |
338 | ||
339 | if(rx & URX_PARITY_ERROR) { | |
340 | *tty->flip.flag_buf_ptr++ = TTY_PARITY; | |
341 | status_handle(info, rx); | |
342 | } else if(rx & URX_OVRUN) { | |
343 | *tty->flip.flag_buf_ptr++ = TTY_OVERRUN; | |
344 | status_handle(info, rx); | |
345 | } else if(rx & URX_FRAME_ERROR) { | |
346 | *tty->flip.flag_buf_ptr++ = TTY_FRAME; | |
347 | status_handle(info, rx); | |
348 | } else { | |
349 | *tty->flip.flag_buf_ptr++ = 0; /* XXX */ | |
350 | } | |
351 | *tty->flip.char_buf_ptr++ = ch; | |
352 | tty->flip.count++; | |
353 | ||
354 | #ifndef CONFIG_XCOPILOT_BUGS | |
355 | } while((rx = uart->urx.w) & URX_DATA_READY); | |
356 | #endif | |
357 | ||
358 | schedule_work(&tty->flip.work); | |
359 | ||
360 | clear_and_exit: | |
361 | return; | |
362 | } | |
363 | ||
364 | static _INLINE_ void transmit_chars(struct m68k_serial *info) | |
365 | { | |
366 | m68328_uart *uart = &uart_addr[info->line]; | |
367 | ||
368 | if (info->x_char) { | |
369 | /* Send next char */ | |
370 | uart->utx.b.txdata = info->x_char; | |
371 | info->x_char = 0; | |
372 | goto clear_and_return; | |
373 | } | |
374 | ||
375 | if((info->xmit_cnt <= 0) || info->tty->stopped) { | |
376 | /* That's peculiar... TX ints off */ | |
377 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
378 | goto clear_and_return; | |
379 | } | |
380 | ||
381 | /* Send char */ | |
382 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
383 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
384 | info->xmit_cnt--; | |
385 | ||
386 | if (info->xmit_cnt < WAKEUP_CHARS) | |
387 | schedule_work(&info->tqueue); | |
388 | ||
389 | if(info->xmit_cnt <= 0) { | |
390 | /* All done for now... TX ints off */ | |
391 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
392 | goto clear_and_return; | |
393 | } | |
394 | ||
395 | clear_and_return: | |
396 | /* Clear interrupt (should be auto)*/ | |
397 | return; | |
398 | } | |
399 | ||
400 | /* | |
401 | * This is the serial driver's generic interrupt routine | |
402 | */ | |
403 | irqreturn_t rs_interrupt(int irq, void *dev_id, struct pt_regs * regs) | |
404 | { | |
405 | struct m68k_serial * info; | |
406 | m68328_uart *uart; | |
407 | unsigned short rx; | |
408 | unsigned short tx; | |
409 | ||
410 | info = IRQ_ports[irq]; | |
411 | if(!info) | |
412 | return IRQ_NONE; | |
413 | ||
414 | uart = &uart_addr[info->line]; | |
415 | rx = uart->urx.w; | |
416 | ||
417 | #ifdef USE_INTS | |
418 | tx = uart->utx.w; | |
419 | ||
420 | if (rx & URX_DATA_READY) receive_chars(info, regs, rx); | |
421 | if (tx & UTX_TX_AVAIL) transmit_chars(info); | |
422 | #else | |
423 | receive_chars(info, regs, rx); | |
424 | #endif | |
425 | return IRQ_HANDLED; | |
426 | } | |
427 | ||
428 | static void do_softint(void *private) | |
429 | { | |
430 | struct m68k_serial *info = (struct m68k_serial *) private; | |
431 | struct tty_struct *tty; | |
432 | ||
433 | tty = info->tty; | |
434 | if (!tty) | |
435 | return; | |
436 | #if 0 | |
437 | if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { | |
438 | tty_wakeup(tty); | |
439 | } | |
440 | #endif | |
441 | } | |
442 | ||
443 | /* | |
444 | * This routine is called from the scheduler tqueue when the interrupt | |
445 | * routine has signalled that a hangup has occurred. The path of | |
446 | * hangup processing is: | |
447 | * | |
448 | * serial interrupt routine -> (scheduler tqueue) -> | |
449 | * do_serial_hangup() -> tty->hangup() -> rs_hangup() | |
450 | * | |
451 | */ | |
452 | static void do_serial_hangup(void *private) | |
453 | { | |
454 | struct m68k_serial *info = (struct m68k_serial *) private; | |
455 | struct tty_struct *tty; | |
456 | ||
457 | tty = info->tty; | |
458 | if (!tty) | |
459 | return; | |
460 | ||
461 | tty_hangup(tty); | |
462 | } | |
463 | ||
464 | ||
465 | static int startup(struct m68k_serial * info) | |
466 | { | |
467 | m68328_uart *uart = &uart_addr[info->line]; | |
468 | unsigned long flags; | |
469 | ||
470 | if (info->flags & S_INITIALIZED) | |
471 | return 0; | |
472 | ||
473 | if (!info->xmit_buf) { | |
474 | info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL); | |
475 | if (!info->xmit_buf) | |
476 | return -ENOMEM; | |
477 | } | |
478 | ||
479 | save_flags(flags); cli(); | |
480 | ||
481 | /* | |
482 | * Clear the FIFO buffers and disable them | |
483 | * (they will be reenabled in change_speed()) | |
484 | */ | |
485 | ||
486 | uart->ustcnt = USTCNT_UEN; | |
487 | info->xmit_fifo_size = 1; | |
488 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN; | |
489 | (void)uart->urx.w; | |
490 | ||
491 | /* | |
492 | * Finally, enable sequencing and interrupts | |
493 | */ | |
494 | #ifdef USE_INTS | |
495 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | | |
496 | USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK; | |
497 | #else | |
498 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK; | |
499 | #endif | |
500 | ||
501 | if (info->tty) | |
502 | clear_bit(TTY_IO_ERROR, &info->tty->flags); | |
503 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; | |
504 | ||
505 | /* | |
506 | * and set the speed of the serial port | |
507 | */ | |
508 | ||
509 | change_speed(info); | |
510 | ||
511 | info->flags |= S_INITIALIZED; | |
512 | restore_flags(flags); | |
513 | return 0; | |
514 | } | |
515 | ||
516 | /* | |
517 | * This routine will shutdown a serial port; interrupts are disabled, and | |
518 | * DTR is dropped if the hangup on close termio flag is on. | |
519 | */ | |
520 | static void shutdown(struct m68k_serial * info) | |
521 | { | |
522 | m68328_uart *uart = &uart_addr[info->line]; | |
523 | unsigned long flags; | |
524 | ||
525 | uart->ustcnt = 0; /* All off! */ | |
526 | if (!(info->flags & S_INITIALIZED)) | |
527 | return; | |
528 | ||
529 | save_flags(flags); cli(); /* Disable interrupts */ | |
530 | ||
531 | if (info->xmit_buf) { | |
532 | free_page((unsigned long) info->xmit_buf); | |
533 | info->xmit_buf = 0; | |
534 | } | |
535 | ||
536 | if (info->tty) | |
537 | set_bit(TTY_IO_ERROR, &info->tty->flags); | |
538 | ||
539 | info->flags &= ~S_INITIALIZED; | |
540 | restore_flags(flags); | |
541 | } | |
542 | ||
543 | struct { | |
544 | int divisor, prescale; | |
545 | } | |
546 | #ifndef CONFIG_M68VZ328 | |
547 | hw_baud_table[18] = { | |
548 | {0,0}, /* 0 */ | |
549 | {0,0}, /* 50 */ | |
550 | {0,0}, /* 75 */ | |
551 | {0,0}, /* 110 */ | |
552 | {0,0}, /* 134 */ | |
553 | {0,0}, /* 150 */ | |
554 | {0,0}, /* 200 */ | |
555 | {7,0x26}, /* 300 */ | |
556 | {6,0x26}, /* 600 */ | |
557 | {5,0x26}, /* 1200 */ | |
558 | {0,0}, /* 1800 */ | |
559 | {4,0x26}, /* 2400 */ | |
560 | {3,0x26}, /* 4800 */ | |
561 | {2,0x26}, /* 9600 */ | |
562 | {1,0x26}, /* 19200 */ | |
563 | {0,0x26}, /* 38400 */ | |
564 | {1,0x38}, /* 57600 */ | |
565 | {0,0x38}, /* 115200 */ | |
566 | }; | |
567 | #else | |
568 | hw_baud_table[18] = { | |
569 | {0,0}, /* 0 */ | |
570 | {0,0}, /* 50 */ | |
571 | {0,0}, /* 75 */ | |
572 | {0,0}, /* 110 */ | |
573 | {0,0}, /* 134 */ | |
574 | {0,0}, /* 150 */ | |
575 | {0,0}, /* 200 */ | |
576 | {0,0}, /* 300 */ | |
577 | {7,0x26}, /* 600 */ | |
578 | {6,0x26}, /* 1200 */ | |
579 | {0,0}, /* 1800 */ | |
580 | {5,0x26}, /* 2400 */ | |
581 | {4,0x26}, /* 4800 */ | |
582 | {3,0x26}, /* 9600 */ | |
583 | {2,0x26}, /* 19200 */ | |
584 | {1,0x26}, /* 38400 */ | |
585 | {0,0x26}, /* 57600 */ | |
586 | {1,0x38}, /* 115200 */ | |
587 | }; | |
588 | #endif | |
589 | /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */ | |
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 change_speed(struct m68k_serial *info) | |
596 | { | |
597 | m68328_uart *uart = &uart_addr[info->line]; | |
598 | unsigned short port; | |
599 | unsigned short ustcnt; | |
600 | unsigned cflag; | |
601 | int i; | |
602 | ||
603 | if (!info->tty || !info->tty->termios) | |
604 | return; | |
605 | cflag = info->tty->termios->c_cflag; | |
606 | if (!(port = info->port)) | |
607 | return; | |
608 | ||
609 | ustcnt = uart->ustcnt; | |
610 | uart->ustcnt = ustcnt & ~USTCNT_TXEN; | |
611 | ||
612 | i = cflag & CBAUD; | |
613 | if (i & CBAUDEX) { | |
614 | i = (i & ~CBAUDEX) + B38400; | |
615 | } | |
616 | ||
617 | info->baud = baud_table[i]; | |
618 | uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
619 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
620 | ||
621 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
622 | ||
623 | if ((cflag & CSIZE) == CS8) | |
624 | ustcnt |= USTCNT_8_7; | |
625 | ||
626 | if (cflag & CSTOPB) | |
627 | ustcnt |= USTCNT_STOP; | |
628 | ||
629 | if (cflag & PARENB) | |
630 | ustcnt |= USTCNT_PARITYEN; | |
631 | if (cflag & PARODD) | |
632 | ustcnt |= USTCNT_ODD_EVEN; | |
633 | ||
634 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
635 | if (cflag & CRTSCTS) { | |
636 | uart->utx.w &= ~ UTX_NOCTS; | |
637 | } else { | |
638 | uart->utx.w |= UTX_NOCTS; | |
639 | } | |
640 | #endif | |
641 | ||
642 | ustcnt |= USTCNT_TXEN; | |
643 | ||
644 | uart->ustcnt = ustcnt; | |
645 | return; | |
646 | } | |
647 | ||
648 | /* | |
649 | * Fair output driver allows a process to speak. | |
650 | */ | |
651 | static void rs_fair_output(void) | |
652 | { | |
653 | int left; /* Output no more than that */ | |
654 | unsigned long flags; | |
655 | struct m68k_serial *info = &m68k_soft[0]; | |
656 | char c; | |
657 | ||
658 | if (info == 0) return; | |
659 | if (info->xmit_buf == 0) return; | |
660 | ||
661 | save_flags(flags); cli(); | |
662 | left = info->xmit_cnt; | |
663 | while (left != 0) { | |
664 | c = info->xmit_buf[info->xmit_tail]; | |
665 | info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1); | |
666 | info->xmit_cnt--; | |
667 | restore_flags(flags); | |
668 | ||
669 | rs_put_char(c); | |
670 | ||
671 | save_flags(flags); cli(); | |
672 | left = min(info->xmit_cnt, left-1); | |
673 | } | |
674 | ||
675 | /* Last character is being transmitted now (hopefully). */ | |
676 | udelay(5); | |
677 | ||
678 | restore_flags(flags); | |
679 | return; | |
680 | } | |
681 | ||
682 | /* | |
683 | * m68k_console_print is registered for printk. | |
684 | */ | |
685 | void console_print_68328(const char *p) | |
686 | { | |
687 | char c; | |
688 | ||
689 | while((c=*(p++)) != 0) { | |
690 | if(c == '\n') | |
691 | rs_put_char('\r'); | |
692 | rs_put_char(c); | |
693 | } | |
694 | ||
695 | /* Comment this if you want to have a strict interrupt-driven output */ | |
696 | rs_fair_output(); | |
697 | ||
698 | return; | |
699 | } | |
700 | ||
701 | static void rs_set_ldisc(struct tty_struct *tty) | |
702 | { | |
703 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
704 | ||
705 | if (serial_paranoia_check(info, tty->name, "rs_set_ldisc")) | |
706 | return; | |
707 | ||
708 | info->is_cons = (tty->termios->c_line == N_TTY); | |
709 | ||
710 | printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off"); | |
711 | } | |
712 | ||
713 | static void rs_flush_chars(struct tty_struct *tty) | |
714 | { | |
715 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
716 | m68328_uart *uart = &uart_addr[info->line]; | |
717 | unsigned long flags; | |
718 | ||
719 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) | |
720 | return; | |
721 | #ifndef USE_INTS | |
722 | for(;;) { | |
723 | #endif | |
724 | ||
725 | /* Enable transmitter */ | |
726 | save_flags(flags); cli(); | |
727 | ||
728 | if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || | |
729 | !info->xmit_buf) { | |
730 | restore_flags(flags); | |
731 | return; | |
732 | } | |
733 | ||
734 | #ifdef USE_INTS | |
735 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
736 | #else | |
737 | uart->ustcnt |= USTCNT_TXEN; | |
738 | #endif | |
739 | ||
740 | #ifdef USE_INTS | |
741 | if (uart->utx.w & UTX_TX_AVAIL) { | |
742 | #else | |
743 | if (1) { | |
744 | #endif | |
745 | /* Send char */ | |
746 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
747 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
748 | info->xmit_cnt--; | |
749 | } | |
750 | ||
751 | #ifndef USE_INTS | |
752 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
753 | } | |
754 | #endif | |
755 | restore_flags(flags); | |
756 | } | |
757 | ||
758 | extern void console_printn(const char * b, int count); | |
759 | ||
760 | static int rs_write(struct tty_struct * tty, | |
761 | const unsigned char *buf, int count) | |
762 | { | |
763 | int c, total = 0; | |
764 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
765 | m68328_uart *uart = &uart_addr[info->line]; | |
766 | unsigned long flags; | |
767 | ||
768 | if (serial_paranoia_check(info, tty->name, "rs_write")) | |
769 | return 0; | |
770 | ||
771 | if (!tty || !info->xmit_buf) | |
772 | return 0; | |
773 | ||
774 | save_flags(flags); | |
775 | while (1) { | |
776 | cli(); | |
777 | c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, | |
778 | SERIAL_XMIT_SIZE - info->xmit_head)); | |
779 | if (c <= 0) | |
780 | break; | |
781 | ||
782 | memcpy(info->xmit_buf + info->xmit_head, buf, c); | |
783 | info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); | |
784 | info->xmit_cnt += c; | |
785 | restore_flags(flags); | |
786 | buf += c; | |
787 | count -= c; | |
788 | total += c; | |
789 | } | |
790 | ||
791 | if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) { | |
792 | /* Enable transmitter */ | |
793 | cli(); | |
794 | #ifndef USE_INTS | |
795 | while(info->xmit_cnt) { | |
796 | #endif | |
797 | ||
798 | uart->ustcnt |= USTCNT_TXEN; | |
799 | #ifdef USE_INTS | |
800 | uart->ustcnt |= USTCNT_TX_INTR_MASK; | |
801 | #else | |
802 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
803 | #endif | |
804 | if (uart->utx.w & UTX_TX_AVAIL) { | |
805 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
806 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
807 | info->xmit_cnt--; | |
808 | } | |
809 | ||
810 | #ifndef USE_INTS | |
811 | } | |
812 | #endif | |
813 | restore_flags(flags); | |
814 | } | |
815 | restore_flags(flags); | |
816 | return total; | |
817 | } | |
818 | ||
819 | static int rs_write_room(struct tty_struct *tty) | |
820 | { | |
821 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
822 | int ret; | |
823 | ||
824 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) | |
825 | return 0; | |
826 | ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; | |
827 | if (ret < 0) | |
828 | ret = 0; | |
829 | return ret; | |
830 | } | |
831 | ||
832 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
833 | { | |
834 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
835 | ||
836 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) | |
837 | return 0; | |
838 | return info->xmit_cnt; | |
839 | } | |
840 | ||
841 | static void rs_flush_buffer(struct tty_struct *tty) | |
842 | { | |
843 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
844 | ||
845 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) | |
846 | return; | |
847 | cli(); | |
848 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; | |
849 | sti(); | |
850 | tty_wakeup(tty); | |
851 | } | |
852 | ||
853 | /* | |
854 | * ------------------------------------------------------------ | |
855 | * rs_throttle() | |
856 | * | |
857 | * This routine is called by the upper-layer tty layer to signal that | |
858 | * incoming characters should be throttled. | |
859 | * ------------------------------------------------------------ | |
860 | */ | |
861 | static void rs_throttle(struct tty_struct * tty) | |
862 | { | |
863 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
864 | ||
865 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) | |
866 | return; | |
867 | ||
868 | if (I_IXOFF(tty)) | |
869 | info->x_char = STOP_CHAR(tty); | |
870 | ||
871 | /* Turn off RTS line (do this atomic) */ | |
872 | } | |
873 | ||
874 | static void rs_unthrottle(struct tty_struct * tty) | |
875 | { | |
876 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
877 | ||
878 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) | |
879 | return; | |
880 | ||
881 | if (I_IXOFF(tty)) { | |
882 | if (info->x_char) | |
883 | info->x_char = 0; | |
884 | else | |
885 | info->x_char = START_CHAR(tty); | |
886 | } | |
887 | ||
888 | /* Assert RTS line (do this atomic) */ | |
889 | } | |
890 | ||
891 | /* | |
892 | * ------------------------------------------------------------ | |
893 | * rs_ioctl() and friends | |
894 | * ------------------------------------------------------------ | |
895 | */ | |
896 | ||
897 | static int get_serial_info(struct m68k_serial * info, | |
898 | struct serial_struct * retinfo) | |
899 | { | |
900 | struct serial_struct tmp; | |
901 | ||
902 | if (!retinfo) | |
903 | return -EFAULT; | |
904 | memset(&tmp, 0, sizeof(tmp)); | |
905 | tmp.type = info->type; | |
906 | tmp.line = info->line; | |
907 | tmp.port = info->port; | |
908 | tmp.irq = info->irq; | |
909 | tmp.flags = info->flags; | |
910 | tmp.baud_base = info->baud_base; | |
911 | tmp.close_delay = info->close_delay; | |
912 | tmp.closing_wait = info->closing_wait; | |
913 | tmp.custom_divisor = info->custom_divisor; | |
914 | copy_to_user(retinfo,&tmp,sizeof(*retinfo)); | |
915 | return 0; | |
916 | } | |
917 | ||
918 | static int set_serial_info(struct m68k_serial * info, | |
919 | struct serial_struct * new_info) | |
920 | { | |
921 | struct serial_struct new_serial; | |
922 | struct m68k_serial old_info; | |
923 | int retval = 0; | |
924 | ||
925 | if (!new_info) | |
926 | return -EFAULT; | |
927 | copy_from_user(&new_serial,new_info,sizeof(new_serial)); | |
928 | old_info = *info; | |
929 | ||
930 | if (!capable(CAP_SYS_ADMIN)) { | |
931 | if ((new_serial.baud_base != info->baud_base) || | |
932 | (new_serial.type != info->type) || | |
933 | (new_serial.close_delay != info->close_delay) || | |
934 | ((new_serial.flags & ~S_USR_MASK) != | |
935 | (info->flags & ~S_USR_MASK))) | |
936 | return -EPERM; | |
937 | info->flags = ((info->flags & ~S_USR_MASK) | | |
938 | (new_serial.flags & S_USR_MASK)); | |
939 | info->custom_divisor = new_serial.custom_divisor; | |
940 | goto check_and_exit; | |
941 | } | |
942 | ||
943 | if (info->count > 1) | |
944 | return -EBUSY; | |
945 | ||
946 | /* | |
947 | * OK, past this point, all the error checking has been done. | |
948 | * At this point, we start making changes..... | |
949 | */ | |
950 | ||
951 | info->baud_base = new_serial.baud_base; | |
952 | info->flags = ((info->flags & ~S_FLAGS) | | |
953 | (new_serial.flags & S_FLAGS)); | |
954 | info->type = new_serial.type; | |
955 | info->close_delay = new_serial.close_delay; | |
956 | info->closing_wait = new_serial.closing_wait; | |
957 | ||
958 | check_and_exit: | |
959 | retval = startup(info); | |
960 | return retval; | |
961 | } | |
962 | ||
963 | /* | |
964 | * get_lsr_info - get line status register info | |
965 | * | |
966 | * Purpose: Let user call ioctl() to get info when the UART physically | |
967 | * is emptied. On bus types like RS485, the transmitter must | |
968 | * release the bus after transmitting. This must be done when | |
969 | * the transmit shift register is empty, not be done when the | |
970 | * transmit holding register is empty. This functionality | |
971 | * allows an RS485 driver to be written in user space. | |
972 | */ | |
973 | static int get_lsr_info(struct m68k_serial * info, unsigned int *value) | |
974 | { | |
975 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
976 | m68328_uart *uart = &uart_addr[info->line]; | |
977 | #endif | |
978 | unsigned char status; | |
979 | ||
980 | cli(); | |
981 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
982 | status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0; | |
983 | #else | |
984 | status = 0; | |
985 | #endif | |
986 | sti(); | |
987 | put_user(status,value); | |
988 | return 0; | |
989 | } | |
990 | ||
991 | /* | |
992 | * This routine sends a break character out the serial port. | |
993 | */ | |
6a72c7ba | 994 | static void send_break(struct m68k_serial * info, unsigned int duration) |
1da177e4 LT |
995 | { |
996 | m68328_uart *uart = &uart_addr[info->line]; | |
997 | unsigned long flags; | |
998 | if (!info->port) | |
999 | return; | |
1da177e4 LT |
1000 | save_flags(flags); |
1001 | cli(); | |
1002 | #ifdef USE_INTS | |
1003 | uart->utx.w |= UTX_SEND_BREAK; | |
6a72c7ba | 1004 | msleep_interruptible(duration); |
1da177e4 LT |
1005 | uart->utx.w &= ~UTX_SEND_BREAK; |
1006 | #endif | |
1007 | restore_flags(flags); | |
1008 | } | |
1009 | ||
1010 | static int rs_ioctl(struct tty_struct *tty, struct file * file, | |
1011 | unsigned int cmd, unsigned long arg) | |
1012 | { | |
1013 | int error; | |
1014 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1015 | int retval; | |
1016 | ||
1017 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
1018 | return -ENODEV; | |
1019 | ||
1020 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
1021 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && | |
1022 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { | |
1023 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1024 | return -EIO; | |
1025 | } | |
1026 | ||
1027 | switch (cmd) { | |
1028 | case TCSBRK: /* SVID version: non-zero arg --> no break */ | |
1029 | retval = tty_check_change(tty); | |
1030 | if (retval) | |
1031 | return retval; | |
1032 | tty_wait_until_sent(tty, 0); | |
1033 | if (!arg) | |
6a72c7ba | 1034 | send_break(info, 250); /* 1/4 second */ |
1da177e4 LT |
1035 | return 0; |
1036 | case TCSBRKP: /* support for POSIX tcsendbreak() */ | |
1037 | retval = tty_check_change(tty); | |
1038 | if (retval) | |
1039 | return retval; | |
1040 | tty_wait_until_sent(tty, 0); | |
6a72c7ba | 1041 | send_break(info, arg ? arg*(100) : 250); |
1da177e4 LT |
1042 | return 0; |
1043 | case TIOCGSOFTCAR: | |
1044 | error = put_user(C_CLOCAL(tty) ? 1 : 0, | |
1045 | (unsigned long *) arg); | |
1046 | if (error) | |
1047 | return error; | |
1048 | return 0; | |
1049 | case TIOCSSOFTCAR: | |
1050 | get_user(arg, (unsigned long *) arg); | |
1051 | tty->termios->c_cflag = | |
1052 | ((tty->termios->c_cflag & ~CLOCAL) | | |
1053 | (arg ? CLOCAL : 0)); | |
1054 | return 0; | |
1055 | case TIOCGSERIAL: | |
1056 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
1057 | sizeof(struct serial_struct))) | |
1058 | return get_serial_info(info, | |
1059 | (struct serial_struct *) arg); | |
1060 | return -EFAULT; | |
1061 | case TIOCSSERIAL: | |
1062 | return set_serial_info(info, | |
1063 | (struct serial_struct *) arg); | |
1064 | case TIOCSERGETLSR: /* Get line status register */ | |
1065 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
1066 | sizeof(unsigned int)); | |
1067 | return get_lsr_info(info, (unsigned int *) arg); | |
1068 | return -EFAULT; | |
1069 | case TIOCSERGSTRUCT: | |
1070 | if (!access_ok(VERIFY_WRITE, (void *) arg, | |
1071 | sizeof(struct m68k_serial))) | |
1072 | return -EFAULT; | |
1073 | copy_to_user((struct m68k_serial *) arg, | |
1074 | info, sizeof(struct m68k_serial)); | |
1075 | return 0; | |
1076 | ||
1077 | default: | |
1078 | return -ENOIOCTLCMD; | |
1079 | } | |
1080 | return 0; | |
1081 | } | |
1082 | ||
1083 | static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios) | |
1084 | { | |
1085 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
1086 | ||
1087 | if (tty->termios->c_cflag == old_termios->c_cflag) | |
1088 | return; | |
1089 | ||
1090 | change_speed(info); | |
1091 | ||
1092 | if ((old_termios->c_cflag & CRTSCTS) && | |
1093 | !(tty->termios->c_cflag & CRTSCTS)) { | |
1094 | tty->hw_stopped = 0; | |
1095 | rs_start(tty); | |
1096 | } | |
1097 | ||
1098 | } | |
1099 | ||
1100 | /* | |
1101 | * ------------------------------------------------------------ | |
1102 | * rs_close() | |
1103 | * | |
1104 | * This routine is called when the serial port gets closed. First, we | |
1105 | * wait for the last remaining data to be sent. Then, we unlink its | |
1106 | * S structure from the interrupt chain if necessary, and we free | |
1107 | * that IRQ if nothing is left in the chain. | |
1108 | * ------------------------------------------------------------ | |
1109 | */ | |
1110 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
1111 | { | |
1112 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1113 | m68328_uart *uart = &uart_addr[info->line]; | |
1114 | unsigned long flags; | |
1115 | ||
1116 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) | |
1117 | return; | |
1118 | ||
1119 | save_flags(flags); cli(); | |
1120 | ||
1121 | if (tty_hung_up_p(filp)) { | |
1122 | restore_flags(flags); | |
1123 | return; | |
1124 | } | |
1125 | ||
1126 | if ((tty->count == 1) && (info->count != 1)) { | |
1127 | /* | |
1128 | * Uh, oh. tty->count is 1, which means that the tty | |
1129 | * structure will be freed. Info->count should always | |
1130 | * be one in these conditions. If it's greater than | |
1131 | * one, we've got real problems, since it means the | |
1132 | * serial port won't be shutdown. | |
1133 | */ | |
1134 | printk("rs_close: bad serial port count; tty->count is 1, " | |
1135 | "info->count is %d\n", info->count); | |
1136 | info->count = 1; | |
1137 | } | |
1138 | if (--info->count < 0) { | |
1139 | printk("rs_close: bad serial port count for ttyS%d: %d\n", | |
1140 | info->line, info->count); | |
1141 | info->count = 0; | |
1142 | } | |
1143 | if (info->count) { | |
1144 | restore_flags(flags); | |
1145 | return; | |
1146 | } | |
1147 | info->flags |= S_CLOSING; | |
1148 | /* | |
1149 | * Now we wait for the transmit buffer to clear; and we notify | |
1150 | * the line discipline to only process XON/XOFF characters. | |
1151 | */ | |
1152 | tty->closing = 1; | |
1153 | if (info->closing_wait != S_CLOSING_WAIT_NONE) | |
1154 | tty_wait_until_sent(tty, info->closing_wait); | |
1155 | /* | |
1156 | * At this point we stop accepting input. To do this, we | |
1157 | * disable the receive line status interrupts, and tell the | |
1158 | * interrupt driver to stop checking the data ready bit in the | |
1159 | * line status register. | |
1160 | */ | |
1161 | ||
1162 | uart->ustcnt &= ~USTCNT_RXEN; | |
1163 | uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK); | |
1164 | ||
1165 | shutdown(info); | |
1166 | if (tty->driver->flush_buffer) | |
1167 | tty->driver->flush_buffer(tty); | |
1168 | ||
1169 | tty_ldisc_flush(tty); | |
1170 | tty->closing = 0; | |
1171 | info->event = 0; | |
1172 | info->tty = 0; | |
1173 | #warning "This is not and has never been valid so fix it" | |
1174 | #if 0 | |
1175 | if (tty->ldisc.num != ldiscs[N_TTY].num) { | |
1176 | if (tty->ldisc.close) | |
1177 | (tty->ldisc.close)(tty); | |
1178 | tty->ldisc = ldiscs[N_TTY]; | |
1179 | tty->termios->c_line = N_TTY; | |
1180 | if (tty->ldisc.open) | |
1181 | (tty->ldisc.open)(tty); | |
1182 | } | |
1183 | #endif | |
1184 | if (info->blocked_open) { | |
1185 | if (info->close_delay) { | |
1186 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); | |
1187 | } | |
1188 | wake_up_interruptible(&info->open_wait); | |
1189 | } | |
1190 | info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING); | |
1191 | wake_up_interruptible(&info->close_wait); | |
1192 | restore_flags(flags); | |
1193 | } | |
1194 | ||
1195 | /* | |
1196 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
1197 | */ | |
1198 | void rs_hangup(struct tty_struct *tty) | |
1199 | { | |
1200 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1201 | ||
1202 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) | |
1203 | return; | |
1204 | ||
1205 | rs_flush_buffer(tty); | |
1206 | shutdown(info); | |
1207 | info->event = 0; | |
1208 | info->count = 0; | |
1209 | info->flags &= ~S_NORMAL_ACTIVE; | |
1210 | info->tty = 0; | |
1211 | wake_up_interruptible(&info->open_wait); | |
1212 | } | |
1213 | ||
1214 | /* | |
1215 | * ------------------------------------------------------------ | |
1216 | * rs_open() and friends | |
1217 | * ------------------------------------------------------------ | |
1218 | */ | |
1219 | static int block_til_ready(struct tty_struct *tty, struct file * filp, | |
1220 | struct m68k_serial *info) | |
1221 | { | |
1222 | DECLARE_WAITQUEUE(wait, current); | |
1223 | int retval; | |
1224 | int do_clocal = 0; | |
1225 | ||
1226 | /* | |
1227 | * If the device is in the middle of being closed, then block | |
1228 | * until it's done, and then try again. | |
1229 | */ | |
1230 | if (info->flags & S_CLOSING) { | |
1231 | interruptible_sleep_on(&info->close_wait); | |
1232 | #ifdef SERIAL_DO_RESTART | |
1233 | if (info->flags & S_HUP_NOTIFY) | |
1234 | return -EAGAIN; | |
1235 | else | |
1236 | return -ERESTARTSYS; | |
1237 | #else | |
1238 | return -EAGAIN; | |
1239 | #endif | |
1240 | } | |
1241 | ||
1242 | /* | |
1243 | * If non-blocking mode is set, or the port is not enabled, | |
1244 | * then make the check up front and then exit. | |
1245 | */ | |
1246 | if ((filp->f_flags & O_NONBLOCK) || | |
1247 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
1248 | info->flags |= S_NORMAL_ACTIVE; | |
1249 | return 0; | |
1250 | } | |
1251 | ||
1252 | if (tty->termios->c_cflag & CLOCAL) | |
1253 | do_clocal = 1; | |
1254 | ||
1255 | /* | |
1256 | * Block waiting for the carrier detect and the line to become | |
1257 | * free (i.e., not in use by the callout). While we are in | |
1258 | * this loop, info->count is dropped by one, so that | |
1259 | * rs_close() knows when to free things. We restore it upon | |
1260 | * exit, either normal or abnormal. | |
1261 | */ | |
1262 | retval = 0; | |
1263 | add_wait_queue(&info->open_wait, &wait); | |
1264 | ||
1265 | info->count--; | |
1266 | info->blocked_open++; | |
1267 | while (1) { | |
1268 | cli(); | |
1269 | m68k_rtsdtr(info, 1); | |
1270 | sti(); | |
1271 | current->state = TASK_INTERRUPTIBLE; | |
1272 | if (tty_hung_up_p(filp) || | |
1273 | !(info->flags & S_INITIALIZED)) { | |
1274 | #ifdef SERIAL_DO_RESTART | |
1275 | if (info->flags & S_HUP_NOTIFY) | |
1276 | retval = -EAGAIN; | |
1277 | else | |
1278 | retval = -ERESTARTSYS; | |
1279 | #else | |
1280 | retval = -EAGAIN; | |
1281 | #endif | |
1282 | break; | |
1283 | } | |
1284 | if (!(info->flags & S_CLOSING) && do_clocal) | |
1285 | break; | |
1286 | if (signal_pending(current)) { | |
1287 | retval = -ERESTARTSYS; | |
1288 | break; | |
1289 | } | |
1290 | schedule(); | |
1291 | } | |
1292 | current->state = TASK_RUNNING; | |
1293 | remove_wait_queue(&info->open_wait, &wait); | |
1294 | if (!tty_hung_up_p(filp)) | |
1295 | info->count++; | |
1296 | info->blocked_open--; | |
1297 | ||
1298 | if (retval) | |
1299 | return retval; | |
1300 | info->flags |= S_NORMAL_ACTIVE; | |
1301 | return 0; | |
1302 | } | |
1303 | ||
1304 | /* | |
1305 | * This routine is called whenever a serial port is opened. It | |
1306 | * enables interrupts for a serial port, linking in its S structure into | |
1307 | * the IRQ chain. It also performs the serial-specific | |
1308 | * initialization for the tty structure. | |
1309 | */ | |
1310 | int rs_open(struct tty_struct *tty, struct file * filp) | |
1311 | { | |
1312 | struct m68k_serial *info; | |
1313 | int retval, line; | |
1314 | ||
1315 | line = tty->index; | |
1316 | ||
1317 | if (line >= NR_PORTS || line < 0) /* we have exactly one */ | |
1318 | return -ENODEV; | |
1319 | ||
1320 | info = &m68k_soft[line]; | |
1321 | ||
1322 | if (serial_paranoia_check(info, tty->name, "rs_open")) | |
1323 | return -ENODEV; | |
1324 | ||
1325 | info->count++; | |
1326 | tty->driver_data = info; | |
1327 | info->tty = tty; | |
1328 | ||
1329 | /* | |
1330 | * Start up serial port | |
1331 | */ | |
1332 | retval = startup(info); | |
1333 | if (retval) | |
1334 | return retval; | |
1335 | ||
1336 | return block_til_ready(tty, filp, info); | |
1337 | } | |
1338 | ||
1339 | /* Finally, routines used to initialize the serial driver. */ | |
1340 | ||
1341 | static void show_serial_version(void) | |
1342 | { | |
1343 | printk("MC68328 serial driver version 1.00\n"); | |
1344 | } | |
1345 | ||
1346 | #ifdef CONFIG_PM | |
1347 | /* Serial Power management | |
1348 | * The console (currently fixed at line 0) is a special case for power | |
1349 | * management because the kernel is so chatty. The console will be | |
1350 | * explicitly disabled my our power manager as the last minute, so we won't | |
1351 | * mess with it here. | |
1352 | */ | |
1353 | static struct pm_dev *serial_pm[NR_PORTS]; | |
1354 | ||
1355 | static int serial_pm_callback(struct pm_dev *dev, pm_request_t request, void *data) | |
1356 | { | |
1357 | struct m68k_serial *info = (struct m68k_serial *)dev->data; | |
1358 | ||
1359 | if(info == NULL) | |
1360 | return -1; | |
1361 | ||
1362 | /* special case for line 0 - pm restores it */ | |
1363 | if(info->line == 0) | |
1364 | return 0; | |
1365 | ||
1366 | switch (request) { | |
1367 | case PM_SUSPEND: | |
1368 | shutdown(info); | |
1369 | break; | |
1370 | ||
1371 | case PM_RESUME: | |
1372 | startup(info); | |
1373 | break; | |
1374 | } | |
1375 | return 0; | |
1376 | } | |
1377 | ||
1378 | void shutdown_console(void) | |
1379 | { | |
1380 | struct m68k_serial *info = &m68k_soft[0]; | |
1381 | ||
1382 | /* HACK: wait a bit for any pending printk's to be dumped */ | |
1383 | { | |
1384 | int i = 10000; | |
1385 | while(i--); | |
1386 | } | |
1387 | ||
1388 | shutdown(info); | |
1389 | } | |
1390 | ||
1391 | void startup_console(void) | |
1392 | { | |
1393 | struct m68k_serial *info = &m68k_soft[0]; | |
1394 | startup(info); | |
1395 | } | |
1396 | #endif | |
1397 | ||
1398 | ||
1399 | static struct tty_operations rs_ops = { | |
1400 | .open = rs_open, | |
1401 | .close = rs_close, | |
1402 | .write = rs_write, | |
1403 | .flush_chars = rs_flush_chars, | |
1404 | .write_room = rs_write_room, | |
1405 | .chars_in_buffer = rs_chars_in_buffer, | |
1406 | .flush_buffer = rs_flush_buffer, | |
1407 | .ioctl = rs_ioctl, | |
1408 | .throttle = rs_throttle, | |
1409 | .unthrottle = rs_unthrottle, | |
1410 | .set_termios = rs_set_termios, | |
1411 | .stop = rs_stop, | |
1412 | .start = rs_start, | |
1413 | .hangup = rs_hangup, | |
1414 | .set_ldisc = rs_set_ldisc, | |
1415 | }; | |
1416 | ||
1417 | /* rs_init inits the driver */ | |
1418 | static int __init | |
1419 | rs68328_init(void) | |
1420 | { | |
1421 | int flags, i; | |
1422 | struct m68k_serial *info; | |
1423 | ||
1424 | serial_driver = alloc_tty_driver(NR_PORTS); | |
1425 | if (!serial_driver) | |
1426 | return -ENOMEM; | |
1427 | ||
1428 | show_serial_version(); | |
1429 | ||
1430 | /* Initialize the tty_driver structure */ | |
1431 | /* SPARC: Not all of this is exactly right for us. */ | |
1432 | ||
1433 | serial_driver->name = "ttyS"; | |
1434 | serial_driver->major = TTY_MAJOR; | |
1435 | serial_driver->minor_start = 64; | |
1436 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
1437 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
1438 | serial_driver->init_termios = tty_std_termios; | |
1439 | serial_driver->init_termios.c_cflag = | |
1440 | m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL; | |
1441 | serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
1442 | tty_set_operations(serial_driver, &rs_ops); | |
1443 | ||
1444 | if (tty_register_driver(serial_driver)) { | |
1445 | put_tty_driver(serial_driver); | |
1446 | printk(KERN_ERR "Couldn't register serial driver\n"); | |
1447 | return -ENOMEM; | |
1448 | } | |
1449 | ||
1450 | save_flags(flags); cli(); | |
1451 | ||
1452 | for(i=0;i<NR_PORTS;i++) { | |
1453 | ||
1454 | info = &m68k_soft[i]; | |
1455 | info->magic = SERIAL_MAGIC; | |
1456 | info->port = (int) &uart_addr[i]; | |
1457 | info->tty = 0; | |
1458 | info->irq = uart_irqs[i]; | |
1459 | info->custom_divisor = 16; | |
1460 | info->close_delay = 50; | |
1461 | info->closing_wait = 3000; | |
1462 | info->x_char = 0; | |
1463 | info->event = 0; | |
1464 | info->count = 0; | |
1465 | info->blocked_open = 0; | |
1466 | INIT_WORK(&info->tqueue, do_softint, info); | |
1467 | INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info); | |
1468 | init_waitqueue_head(&info->open_wait); | |
1469 | init_waitqueue_head(&info->close_wait); | |
1470 | info->line = i; | |
1471 | info->is_cons = 1; /* Means shortcuts work */ | |
1472 | ||
1473 | printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line, | |
1474 | info->port, info->irq); | |
1475 | printk(" is a builtin MC68328 UART\n"); | |
1476 | ||
1477 | IRQ_ports[info->irq] = info; /* waste of space */ | |
1478 | ||
1479 | #ifdef CONFIG_M68VZ328 | |
1480 | if (i > 0 ) | |
1481 | PJSEL &= 0xCF; /* PSW enable second port output */ | |
1482 | #endif | |
1483 | ||
1484 | if (request_irq(uart_irqs[i], | |
1485 | rs_interrupt, | |
1486 | IRQ_FLG_STD, | |
1487 | "M68328_UART", NULL)) | |
1488 | panic("Unable to attach 68328 serial interrupt\n"); | |
1489 | #ifdef CONFIG_PM | |
1490 | serial_pm[i] = pm_register(PM_SYS_DEV, PM_SYS_COM, serial_pm_callback); | |
1491 | if (serial_pm[i]) | |
1492 | serial_pm[i]->data = info; | |
1493 | #endif | |
1494 | } | |
1495 | restore_flags(flags); | |
1496 | return 0; | |
1497 | } | |
1498 | ||
1da177e4 LT |
1499 | module_init(rs68328_init); |
1500 | ||
1501 | ||
1502 | ||
1503 | static void m68328_set_baud(void) | |
1504 | { | |
1505 | unsigned short ustcnt; | |
1506 | int i; | |
1507 | ||
1508 | ustcnt = USTCNT; | |
1509 | USTCNT = ustcnt & ~USTCNT_TXEN; | |
1510 | ||
1511 | again: | |
1512 | for (i = 0; i < sizeof(baud_table) / sizeof(baud_table[0]); i++) | |
1513 | if (baud_table[i] == m68328_console_baud) | |
1514 | break; | |
1515 | if (i >= sizeof(baud_table) / sizeof(baud_table[0])) { | |
1516 | m68328_console_baud = 9600; | |
1517 | goto again; | |
1518 | } | |
1519 | ||
1520 | UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
1521 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
1522 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
1523 | ustcnt |= USTCNT_8_7; | |
1524 | ustcnt |= USTCNT_TXEN; | |
1525 | USTCNT = ustcnt; | |
1526 | m68328_console_initted = 1; | |
1527 | return; | |
1528 | } | |
1529 | ||
1530 | ||
1531 | int m68328_console_setup(struct console *cp, char *arg) | |
1532 | { | |
1533 | int i, n = CONSOLE_BAUD_RATE; | |
1534 | ||
1535 | if (!cp) | |
1536 | return(-1); | |
1537 | ||
1538 | if (arg) | |
1539 | n = simple_strtoul(arg,NULL,0); | |
1540 | ||
1541 | for (i = 0; i < BAUD_TABLE_SIZE; i++) | |
1542 | if (baud_table[i] == n) | |
1543 | break; | |
1544 | if (i < BAUD_TABLE_SIZE) { | |
1545 | m68328_console_baud = n; | |
1546 | m68328_console_cbaud = 0; | |
1547 | if (i > 15) { | |
1548 | m68328_console_cbaud |= CBAUDEX; | |
1549 | i -= 15; | |
1550 | } | |
1551 | m68328_console_cbaud |= i; | |
1552 | } | |
1553 | ||
1554 | m68328_set_baud(); /* make sure baud rate changes */ | |
1555 | return(0); | |
1556 | } | |
1557 | ||
1558 | ||
1559 | static struct tty_driver *m68328_console_device(struct console *c, int *index) | |
1560 | { | |
1561 | *index = c->index; | |
1562 | return serial_driver; | |
1563 | } | |
1564 | ||
1565 | ||
1566 | void m68328_console_write (struct console *co, const char *str, | |
1567 | unsigned int count) | |
1568 | { | |
1569 | if (!m68328_console_initted) | |
1570 | m68328_set_baud(); | |
1571 | while (count--) { | |
1572 | if (*str == '\n') | |
1573 | rs_put_char('\r'); | |
1574 | rs_put_char( *str++ ); | |
1575 | } | |
1576 | } | |
1577 | ||
1578 | ||
1579 | static struct console m68328_driver = { | |
1580 | .name = "ttyS", | |
1581 | .write = m68328_console_write, | |
1582 | .device = m68328_console_device, | |
1583 | .setup = m68328_console_setup, | |
1584 | .flags = CON_PRINTBUFFER, | |
1585 | .index = -1, | |
1586 | }; | |
1587 | ||
1588 | ||
1589 | static int __init m68328_console_init(void) | |
1590 | { | |
1591 | register_console(&m68328_driver); | |
1592 | return 0; | |
1593 | } | |
1594 | ||
1595 | console_initcall(m68328_console_init); |