Commit | Line | Data |
---|---|---|
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> | |
bca73e4b | 37 | #include <linux/pm_legacy.h> |
1da177e4 LT |
38 | #include <linux/bitops.h> |
39 | #include <linux/delay.h> | |
40 | ||
41 | #include <asm/io.h> | |
42 | #include <asm/irq.h> | |
43 | #include <asm/system.h> | |
1da177e4 LT |
44 | #include <asm/delay.h> |
45 | #include <asm/uaccess.h> | |
46 | ||
47 | /* (es) */ | |
48 | /* note: perhaps we can murge these files, so that you can just | |
49 | * define 1 of them, and they can sort that out for themselves | |
50 | */ | |
51 | #if defined(CONFIG_M68EZ328) | |
52 | #include <asm/MC68EZ328.h> | |
53 | #else | |
54 | #if defined(CONFIG_M68VZ328) | |
55 | #include <asm/MC68VZ328.h> | |
56 | #else | |
57 | #include <asm/MC68328.h> | |
58 | #endif /* CONFIG_M68VZ328 */ | |
59 | #endif /* CONFIG_M68EZ328 */ | |
60 | ||
61 | #include "68328serial.h" | |
62 | ||
63 | /* Turn off usage of real serial interrupt code, to "support" Copilot */ | |
64 | #ifdef CONFIG_XCOPILOT_BUGS | |
65 | #undef USE_INTS | |
66 | #else | |
67 | #define USE_INTS | |
68 | #endif | |
69 | ||
70 | static struct m68k_serial m68k_soft[NR_PORTS]; | |
71 | struct m68k_serial *IRQ_ports[NR_IRQS]; | |
72 | ||
73 | static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS; | |
74 | ||
75 | /* multiple ports are contiguous in memory */ | |
76 | m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR; | |
77 | ||
78 | struct tty_struct m68k_ttys; | |
79 | struct m68k_serial *m68k_consinfo = 0; | |
80 | ||
81 | #define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */ | |
82 | ||
83 | #ifdef CONFIG_CONSOLE | |
84 | extern wait_queue_head_t keypress_wait; | |
85 | #endif | |
86 | ||
87 | struct tty_driver *serial_driver; | |
88 | ||
89 | /* serial subtype definitions */ | |
90 | #define SERIAL_TYPE_NORMAL 1 | |
91 | ||
92 | /* number of characters left in xmit buffer before we ask for more */ | |
93 | #define WAKEUP_CHARS 256 | |
94 | ||
95 | /* Debugging... DEBUG_INTR is bad to use when one of the zs | |
96 | * lines is your console ;( | |
97 | */ | |
98 | #undef SERIAL_DEBUG_INTR | |
99 | #undef SERIAL_DEBUG_OPEN | |
100 | #undef SERIAL_DEBUG_FLOW | |
101 | ||
102 | #define RS_ISR_PASS_LIMIT 256 | |
103 | ||
104 | #define _INLINE_ inline | |
105 | ||
106 | static void change_speed(struct m68k_serial *info); | |
107 | ||
108 | /* | |
109 | * Setup for console. Argument comes from the boot command line. | |
110 | */ | |
111 | ||
112 | #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ) | |
113 | #define CONSOLE_BAUD_RATE 115200 | |
114 | #define DEFAULT_CBAUD B115200 | |
115 | #else | |
116 | /* (es) */ | |
117 | /* note: this is messy, but it works, again, perhaps defined somewhere else?*/ | |
118 | #ifdef CONFIG_M68VZ328 | |
119 | #define CONSOLE_BAUD_RATE 19200 | |
120 | #define DEFAULT_CBAUD B19200 | |
121 | #endif | |
122 | /* (/es) */ | |
123 | #endif | |
124 | ||
125 | #ifndef CONSOLE_BAUD_RATE | |
126 | #define CONSOLE_BAUD_RATE 9600 | |
127 | #define DEFAULT_CBAUD B9600 | |
128 | #endif | |
129 | ||
130 | ||
131 | static int m68328_console_initted = 0; | |
132 | static int m68328_console_baud = CONSOLE_BAUD_RATE; | |
133 | static int m68328_console_cbaud = DEFAULT_CBAUD; | |
134 | ||
135 | ||
136 | /* | |
137 | * tmp_buf is used as a temporary buffer by serial_write. We need to | |
138 | * lock it in case the memcpy_fromfs blocks while swapping in a page, | |
139 | * and some other program tries to do a serial write at the same time. | |
140 | * Since the lock will only come under contention when the system is | |
141 | * swapping and available memory is low, it makes sense to share one | |
142 | * buffer across all the serial ports, since it significantly saves | |
143 | * memory if large numbers of serial ports are open. | |
144 | */ | |
145 | static unsigned char tmp_buf[SERIAL_XMIT_SIZE]; /* This is cheating */ | |
146 | DECLARE_MUTEX(tmp_buf_sem); | |
147 | ||
148 | static inline int serial_paranoia_check(struct m68k_serial *info, | |
149 | char *name, const char *routine) | |
150 | { | |
151 | #ifdef SERIAL_PARANOIA_CHECK | |
152 | static const char *badmagic = | |
153 | "Warning: bad magic number for serial struct %s in %s\n"; | |
154 | static const char *badinfo = | |
155 | "Warning: null m68k_serial for %s in %s\n"; | |
156 | ||
157 | if (!info) { | |
158 | printk(badinfo, name, routine); | |
159 | return 1; | |
160 | } | |
161 | if (info->magic != SERIAL_MAGIC) { | |
162 | printk(badmagic, name, routine); | |
163 | return 1; | |
164 | } | |
165 | #endif | |
166 | return 0; | |
167 | } | |
168 | ||
169 | /* | |
170 | * This is used to figure out the divisor speeds and the timeouts | |
171 | */ | |
172 | static int baud_table[] = { | |
173 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, | |
174 | 9600, 19200, 38400, 57600, 115200, 0 }; | |
175 | ||
176 | #define BAUD_TABLE_SIZE (sizeof(baud_table)/sizeof(baud_table[0])) | |
177 | ||
178 | /* Sets or clears DTR/RTS on the requested line */ | |
179 | static inline void m68k_rtsdtr(struct m68k_serial *ss, int set) | |
180 | { | |
181 | if (set) { | |
182 | /* set the RTS/CTS line */ | |
183 | } else { | |
184 | /* clear it */ | |
185 | } | |
186 | return; | |
187 | } | |
188 | ||
189 | /* Utility routines */ | |
190 | static inline int get_baud(struct m68k_serial *ss) | |
191 | { | |
192 | unsigned long result = 115200; | |
193 | unsigned short int baud = uart_addr[ss->line].ubaud; | |
194 | if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400; | |
195 | result >>= GET_FIELD(baud, UBAUD_DIVIDE); | |
196 | ||
197 | return result; | |
198 | } | |
199 | ||
200 | /* | |
201 | * ------------------------------------------------------------ | |
202 | * rs_stop() and rs_start() | |
203 | * | |
204 | * This routines are called before setting or resetting tty->stopped. | |
205 | * They enable or disable transmitter interrupts, as necessary. | |
206 | * ------------------------------------------------------------ | |
207 | */ | |
208 | static void rs_stop(struct tty_struct *tty) | |
209 | { | |
210 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
211 | m68328_uart *uart = &uart_addr[info->line]; | |
212 | unsigned long flags; | |
213 | ||
214 | if (serial_paranoia_check(info, tty->name, "rs_stop")) | |
215 | return; | |
216 | ||
217 | save_flags(flags); cli(); | |
218 | uart->ustcnt &= ~USTCNT_TXEN; | |
219 | restore_flags(flags); | |
220 | } | |
221 | ||
222 | static void rs_put_char(char ch) | |
223 | { | |
224 | int flags, loops = 0; | |
225 | ||
226 | save_flags(flags); cli(); | |
227 | ||
228 | while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) { | |
229 | loops++; | |
230 | udelay(5); | |
231 | } | |
232 | ||
233 | UTX_TXDATA = ch; | |
234 | udelay(5); | |
235 | restore_flags(flags); | |
236 | } | |
237 | ||
238 | static void rs_start(struct tty_struct *tty) | |
239 | { | |
240 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
241 | m68328_uart *uart = &uart_addr[info->line]; | |
242 | unsigned long flags; | |
243 | ||
244 | if (serial_paranoia_check(info, tty->name, "rs_start")) | |
245 | return; | |
246 | ||
247 | save_flags(flags); cli(); | |
248 | if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) { | |
249 | #ifdef USE_INTS | |
250 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
251 | #else | |
252 | uart->ustcnt |= USTCNT_TXEN; | |
253 | #endif | |
254 | } | |
255 | restore_flags(flags); | |
256 | } | |
257 | ||
258 | /* Drop into either the boot monitor or kadb upon receiving a break | |
259 | * from keyboard/console input. | |
260 | */ | |
261 | static void batten_down_hatches(void) | |
262 | { | |
263 | /* Drop into the debugger */ | |
264 | } | |
265 | ||
266 | static _INLINE_ void status_handle(struct m68k_serial *info, unsigned short status) | |
267 | { | |
268 | #if 0 | |
269 | if(status & DCD) { | |
270 | if((info->tty->termios->c_cflag & CRTSCTS) && | |
271 | ((info->curregs[3] & AUTO_ENAB)==0)) { | |
272 | info->curregs[3] |= AUTO_ENAB; | |
273 | info->pendregs[3] |= AUTO_ENAB; | |
274 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
275 | } | |
276 | } else { | |
277 | if((info->curregs[3] & AUTO_ENAB)) { | |
278 | info->curregs[3] &= ~AUTO_ENAB; | |
279 | info->pendregs[3] &= ~AUTO_ENAB; | |
280 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
281 | } | |
282 | } | |
283 | #endif | |
284 | /* If this is console input and this is a | |
285 | * 'break asserted' status change interrupt | |
286 | * see if we can drop into the debugger | |
287 | */ | |
288 | if((status & URX_BREAK) && info->break_abort) | |
289 | batten_down_hatches(); | |
290 | return; | |
291 | } | |
292 | ||
293 | static _INLINE_ void receive_chars(struct m68k_serial *info, struct pt_regs *regs, unsigned short rx) | |
294 | { | |
295 | struct tty_struct *tty = info->tty; | |
296 | m68328_uart *uart = &uart_addr[info->line]; | |
33f0f88f | 297 | unsigned char ch, flag; |
1da177e4 LT |
298 | |
299 | /* | |
300 | * This do { } while() loop will get ALL chars out of Rx FIFO | |
301 | */ | |
302 | #ifndef CONFIG_XCOPILOT_BUGS | |
303 | do { | |
304 | #endif | |
305 | ch = GET_FIELD(rx, URX_RXDATA); | |
306 | ||
307 | if(info->is_cons) { | |
308 | if(URX_BREAK & rx) { /* whee, break received */ | |
309 | status_handle(info, rx); | |
310 | return; | |
311 | #ifdef CONFIG_MAGIC_SYSRQ | |
312 | } else if (ch == 0x10) { /* ^P */ | |
313 | show_state(); | |
314 | show_free_areas(); | |
315 | show_buffers(); | |
316 | /* show_net_buffers(); */ | |
317 | return; | |
318 | } else if (ch == 0x12) { /* ^R */ | |
804ebf46 | 319 | emergency_restart(); |
1da177e4 LT |
320 | return; |
321 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
322 | } | |
323 | /* It is a 'keyboard interrupt' ;-) */ | |
324 | #ifdef CONFIG_CONSOLE | |
325 | wake_up(&keypress_wait); | |
326 | #endif | |
327 | } | |
328 | ||
329 | if(!tty) | |
330 | goto clear_and_exit; | |
331 | ||
332 | /* | |
333 | * Make sure that we do not overflow the buffer | |
334 | */ | |
33f0f88f | 335 | if (tty_request_buffer_room(tty, 1) == 0) { |
1da177e4 LT |
336 | schedule_work(&tty->flip.work); |
337 | return; | |
338 | } | |
339 | ||
33f0f88f AC |
340 | flag = TTY_NORMAL; |
341 | ||
1da177e4 | 342 | if(rx & URX_PARITY_ERROR) { |
33f0f88f | 343 | flag = TTY_PARITY; |
1da177e4 LT |
344 | status_handle(info, rx); |
345 | } else if(rx & URX_OVRUN) { | |
33f0f88f | 346 | flag = TTY_OVERRUN; |
1da177e4 LT |
347 | status_handle(info, rx); |
348 | } else if(rx & URX_FRAME_ERROR) { | |
33f0f88f | 349 | flag = TTY_FRAME; |
1da177e4 | 350 | status_handle(info, rx); |
1da177e4 | 351 | } |
33f0f88f | 352 | tty_insert_flip_char(tty, ch, flag); |
1da177e4 LT |
353 | #ifndef CONFIG_XCOPILOT_BUGS |
354 | } while((rx = uart->urx.w) & URX_DATA_READY); | |
355 | #endif | |
356 | ||
357 | schedule_work(&tty->flip.work); | |
358 | ||
359 | clear_and_exit: | |
360 | return; | |
361 | } | |
362 | ||
363 | static _INLINE_ void transmit_chars(struct m68k_serial *info) | |
364 | { | |
365 | m68328_uart *uart = &uart_addr[info->line]; | |
366 | ||
367 | if (info->x_char) { | |
368 | /* Send next char */ | |
369 | uart->utx.b.txdata = info->x_char; | |
370 | info->x_char = 0; | |
371 | goto clear_and_return; | |
372 | } | |
373 | ||
374 | if((info->xmit_cnt <= 0) || info->tty->stopped) { | |
375 | /* That's peculiar... TX ints off */ | |
376 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
377 | goto clear_and_return; | |
378 | } | |
379 | ||
380 | /* Send char */ | |
381 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
382 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
383 | info->xmit_cnt--; | |
384 | ||
385 | if (info->xmit_cnt < WAKEUP_CHARS) | |
386 | schedule_work(&info->tqueue); | |
387 | ||
388 | if(info->xmit_cnt <= 0) { | |
389 | /* All done for now... TX ints off */ | |
390 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
391 | goto clear_and_return; | |
392 | } | |
393 | ||
394 | clear_and_return: | |
395 | /* Clear interrupt (should be auto)*/ | |
396 | return; | |
397 | } | |
398 | ||
399 | /* | |
400 | * This is the serial driver's generic interrupt routine | |
401 | */ | |
402 | irqreturn_t rs_interrupt(int irq, void *dev_id, struct pt_regs * regs) | |
403 | { | |
404 | struct m68k_serial * info; | |
405 | m68328_uart *uart; | |
406 | unsigned short rx; | |
407 | unsigned short tx; | |
408 | ||
409 | info = IRQ_ports[irq]; | |
410 | if(!info) | |
411 | return IRQ_NONE; | |
412 | ||
413 | uart = &uart_addr[info->line]; | |
414 | rx = uart->urx.w; | |
415 | ||
416 | #ifdef USE_INTS | |
417 | tx = uart->utx.w; | |
418 | ||
419 | if (rx & URX_DATA_READY) receive_chars(info, regs, rx); | |
420 | if (tx & UTX_TX_AVAIL) transmit_chars(info); | |
421 | #else | |
422 | receive_chars(info, regs, rx); | |
423 | #endif | |
424 | return IRQ_HANDLED; | |
425 | } | |
426 | ||
427 | static void do_softint(void *private) | |
428 | { | |
429 | struct m68k_serial *info = (struct m68k_serial *) private; | |
430 | struct tty_struct *tty; | |
431 | ||
432 | tty = info->tty; | |
433 | if (!tty) | |
434 | return; | |
435 | #if 0 | |
436 | if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { | |
437 | tty_wakeup(tty); | |
438 | } | |
439 | #endif | |
440 | } | |
441 | ||
442 | /* | |
443 | * This routine is called from the scheduler tqueue when the interrupt | |
444 | * routine has signalled that a hangup has occurred. The path of | |
445 | * hangup processing is: | |
446 | * | |
447 | * serial interrupt routine -> (scheduler tqueue) -> | |
448 | * do_serial_hangup() -> tty->hangup() -> rs_hangup() | |
449 | * | |
450 | */ | |
451 | static void do_serial_hangup(void *private) | |
452 | { | |
453 | struct m68k_serial *info = (struct m68k_serial *) private; | |
454 | struct tty_struct *tty; | |
455 | ||
456 | tty = info->tty; | |
457 | if (!tty) | |
458 | return; | |
459 | ||
460 | tty_hangup(tty); | |
461 | } | |
462 | ||
463 | ||
464 | static int startup(struct m68k_serial * info) | |
465 | { | |
466 | m68328_uart *uart = &uart_addr[info->line]; | |
467 | unsigned long flags; | |
468 | ||
469 | if (info->flags & S_INITIALIZED) | |
470 | return 0; | |
471 | ||
472 | if (!info->xmit_buf) { | |
473 | info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL); | |
474 | if (!info->xmit_buf) | |
475 | return -ENOMEM; | |
476 | } | |
477 | ||
478 | save_flags(flags); cli(); | |
479 | ||
480 | /* | |
481 | * Clear the FIFO buffers and disable them | |
482 | * (they will be reenabled in change_speed()) | |
483 | */ | |
484 | ||
485 | uart->ustcnt = USTCNT_UEN; | |
486 | info->xmit_fifo_size = 1; | |
487 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN; | |
488 | (void)uart->urx.w; | |
489 | ||
490 | /* | |
491 | * Finally, enable sequencing and interrupts | |
492 | */ | |
493 | #ifdef USE_INTS | |
494 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | | |
495 | USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK; | |
496 | #else | |
497 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK; | |
498 | #endif | |
499 | ||
500 | if (info->tty) | |
501 | clear_bit(TTY_IO_ERROR, &info->tty->flags); | |
502 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; | |
503 | ||
504 | /* | |
505 | * and set the speed of the serial port | |
506 | */ | |
507 | ||
508 | change_speed(info); | |
509 | ||
510 | info->flags |= S_INITIALIZED; | |
511 | restore_flags(flags); | |
512 | return 0; | |
513 | } | |
514 | ||
515 | /* | |
516 | * This routine will shutdown a serial port; interrupts are disabled, and | |
517 | * DTR is dropped if the hangup on close termio flag is on. | |
518 | */ | |
519 | static void shutdown(struct m68k_serial * info) | |
520 | { | |
521 | m68328_uart *uart = &uart_addr[info->line]; | |
522 | unsigned long flags; | |
523 | ||
524 | uart->ustcnt = 0; /* All off! */ | |
525 | if (!(info->flags & S_INITIALIZED)) | |
526 | return; | |
527 | ||
528 | save_flags(flags); cli(); /* Disable interrupts */ | |
529 | ||
530 | if (info->xmit_buf) { | |
531 | free_page((unsigned long) info->xmit_buf); | |
532 | info->xmit_buf = 0; | |
533 | } | |
534 | ||
535 | if (info->tty) | |
536 | set_bit(TTY_IO_ERROR, &info->tty->flags); | |
537 | ||
538 | info->flags &= ~S_INITIALIZED; | |
539 | restore_flags(flags); | |
540 | } | |
541 | ||
542 | struct { | |
543 | int divisor, prescale; | |
544 | } | |
545 | #ifndef CONFIG_M68VZ328 | |
546 | hw_baud_table[18] = { | |
547 | {0,0}, /* 0 */ | |
548 | {0,0}, /* 50 */ | |
549 | {0,0}, /* 75 */ | |
550 | {0,0}, /* 110 */ | |
551 | {0,0}, /* 134 */ | |
552 | {0,0}, /* 150 */ | |
553 | {0,0}, /* 200 */ | |
554 | {7,0x26}, /* 300 */ | |
555 | {6,0x26}, /* 600 */ | |
556 | {5,0x26}, /* 1200 */ | |
557 | {0,0}, /* 1800 */ | |
558 | {4,0x26}, /* 2400 */ | |
559 | {3,0x26}, /* 4800 */ | |
560 | {2,0x26}, /* 9600 */ | |
561 | {1,0x26}, /* 19200 */ | |
562 | {0,0x26}, /* 38400 */ | |
563 | {1,0x38}, /* 57600 */ | |
564 | {0,0x38}, /* 115200 */ | |
565 | }; | |
566 | #else | |
567 | hw_baud_table[18] = { | |
568 | {0,0}, /* 0 */ | |
569 | {0,0}, /* 50 */ | |
570 | {0,0}, /* 75 */ | |
571 | {0,0}, /* 110 */ | |
572 | {0,0}, /* 134 */ | |
573 | {0,0}, /* 150 */ | |
574 | {0,0}, /* 200 */ | |
575 | {0,0}, /* 300 */ | |
576 | {7,0x26}, /* 600 */ | |
577 | {6,0x26}, /* 1200 */ | |
578 | {0,0}, /* 1800 */ | |
579 | {5,0x26}, /* 2400 */ | |
580 | {4,0x26}, /* 4800 */ | |
581 | {3,0x26}, /* 9600 */ | |
582 | {2,0x26}, /* 19200 */ | |
583 | {1,0x26}, /* 38400 */ | |
584 | {0,0x26}, /* 57600 */ | |
585 | {1,0x38}, /* 115200 */ | |
586 | }; | |
587 | #endif | |
588 | /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */ | |
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 change_speed(struct m68k_serial *info) | |
595 | { | |
596 | m68328_uart *uart = &uart_addr[info->line]; | |
597 | unsigned short port; | |
598 | unsigned short ustcnt; | |
599 | unsigned cflag; | |
600 | int i; | |
601 | ||
602 | if (!info->tty || !info->tty->termios) | |
603 | return; | |
604 | cflag = info->tty->termios->c_cflag; | |
605 | if (!(port = info->port)) | |
606 | return; | |
607 | ||
608 | ustcnt = uart->ustcnt; | |
609 | uart->ustcnt = ustcnt & ~USTCNT_TXEN; | |
610 | ||
611 | i = cflag & CBAUD; | |
612 | if (i & CBAUDEX) { | |
613 | i = (i & ~CBAUDEX) + B38400; | |
614 | } | |
615 | ||
616 | info->baud = baud_table[i]; | |
617 | uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
618 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
619 | ||
620 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
621 | ||
622 | if ((cflag & CSIZE) == CS8) | |
623 | ustcnt |= USTCNT_8_7; | |
624 | ||
625 | if (cflag & CSTOPB) | |
626 | ustcnt |= USTCNT_STOP; | |
627 | ||
628 | if (cflag & PARENB) | |
629 | ustcnt |= USTCNT_PARITYEN; | |
630 | if (cflag & PARODD) | |
631 | ustcnt |= USTCNT_ODD_EVEN; | |
632 | ||
633 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
634 | if (cflag & CRTSCTS) { | |
635 | uart->utx.w &= ~ UTX_NOCTS; | |
636 | } else { | |
637 | uart->utx.w |= UTX_NOCTS; | |
638 | } | |
639 | #endif | |
640 | ||
641 | ustcnt |= USTCNT_TXEN; | |
642 | ||
643 | uart->ustcnt = ustcnt; | |
644 | return; | |
645 | } | |
646 | ||
647 | /* | |
648 | * Fair output driver allows a process to speak. | |
649 | */ | |
650 | static void rs_fair_output(void) | |
651 | { | |
652 | int left; /* Output no more than that */ | |
653 | unsigned long flags; | |
654 | struct m68k_serial *info = &m68k_soft[0]; | |
655 | char c; | |
656 | ||
657 | if (info == 0) return; | |
658 | if (info->xmit_buf == 0) return; | |
659 | ||
660 | save_flags(flags); cli(); | |
661 | left = info->xmit_cnt; | |
662 | while (left != 0) { | |
663 | c = info->xmit_buf[info->xmit_tail]; | |
664 | info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1); | |
665 | info->xmit_cnt--; | |
666 | restore_flags(flags); | |
667 | ||
668 | rs_put_char(c); | |
669 | ||
670 | save_flags(flags); cli(); | |
671 | left = min(info->xmit_cnt, left-1); | |
672 | } | |
673 | ||
674 | /* Last character is being transmitted now (hopefully). */ | |
675 | udelay(5); | |
676 | ||
677 | restore_flags(flags); | |
678 | return; | |
679 | } | |
680 | ||
681 | /* | |
682 | * m68k_console_print is registered for printk. | |
683 | */ | |
684 | void console_print_68328(const char *p) | |
685 | { | |
686 | char c; | |
687 | ||
688 | while((c=*(p++)) != 0) { | |
689 | if(c == '\n') | |
690 | rs_put_char('\r'); | |
691 | rs_put_char(c); | |
692 | } | |
693 | ||
694 | /* Comment this if you want to have a strict interrupt-driven output */ | |
695 | rs_fair_output(); | |
696 | ||
697 | return; | |
698 | } | |
699 | ||
700 | static void rs_set_ldisc(struct tty_struct *tty) | |
701 | { | |
702 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
703 | ||
704 | if (serial_paranoia_check(info, tty->name, "rs_set_ldisc")) | |
705 | return; | |
706 | ||
707 | info->is_cons = (tty->termios->c_line == N_TTY); | |
708 | ||
709 | printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off"); | |
710 | } | |
711 | ||
712 | static void rs_flush_chars(struct tty_struct *tty) | |
713 | { | |
714 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
715 | m68328_uart *uart = &uart_addr[info->line]; | |
716 | unsigned long flags; | |
717 | ||
718 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) | |
719 | return; | |
720 | #ifndef USE_INTS | |
721 | for(;;) { | |
722 | #endif | |
723 | ||
724 | /* Enable transmitter */ | |
725 | save_flags(flags); cli(); | |
726 | ||
727 | if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || | |
728 | !info->xmit_buf) { | |
729 | restore_flags(flags); | |
730 | return; | |
731 | } | |
732 | ||
733 | #ifdef USE_INTS | |
734 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
735 | #else | |
736 | uart->ustcnt |= USTCNT_TXEN; | |
737 | #endif | |
738 | ||
739 | #ifdef USE_INTS | |
740 | if (uart->utx.w & UTX_TX_AVAIL) { | |
741 | #else | |
742 | if (1) { | |
743 | #endif | |
744 | /* Send char */ | |
745 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
746 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
747 | info->xmit_cnt--; | |
748 | } | |
749 | ||
750 | #ifndef USE_INTS | |
751 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
752 | } | |
753 | #endif | |
754 | restore_flags(flags); | |
755 | } | |
756 | ||
757 | extern void console_printn(const char * b, int count); | |
758 | ||
759 | static int rs_write(struct tty_struct * tty, | |
760 | const unsigned char *buf, int count) | |
761 | { | |
762 | int c, total = 0; | |
763 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
764 | m68328_uart *uart = &uart_addr[info->line]; | |
765 | unsigned long flags; | |
766 | ||
767 | if (serial_paranoia_check(info, tty->name, "rs_write")) | |
768 | return 0; | |
769 | ||
770 | if (!tty || !info->xmit_buf) | |
771 | return 0; | |
772 | ||
773 | save_flags(flags); | |
774 | while (1) { | |
775 | cli(); | |
776 | c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, | |
777 | SERIAL_XMIT_SIZE - info->xmit_head)); | |
778 | if (c <= 0) | |
779 | break; | |
780 | ||
781 | memcpy(info->xmit_buf + info->xmit_head, buf, c); | |
782 | info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); | |
783 | info->xmit_cnt += c; | |
784 | restore_flags(flags); | |
785 | buf += c; | |
786 | count -= c; | |
787 | total += c; | |
788 | } | |
789 | ||
790 | if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) { | |
791 | /* Enable transmitter */ | |
792 | cli(); | |
793 | #ifndef USE_INTS | |
794 | while(info->xmit_cnt) { | |
795 | #endif | |
796 | ||
797 | uart->ustcnt |= USTCNT_TXEN; | |
798 | #ifdef USE_INTS | |
799 | uart->ustcnt |= USTCNT_TX_INTR_MASK; | |
800 | #else | |
801 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
802 | #endif | |
803 | if (uart->utx.w & UTX_TX_AVAIL) { | |
804 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
805 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
806 | info->xmit_cnt--; | |
807 | } | |
808 | ||
809 | #ifndef USE_INTS | |
810 | } | |
811 | #endif | |
812 | restore_flags(flags); | |
813 | } | |
814 | restore_flags(flags); | |
815 | return total; | |
816 | } | |
817 | ||
818 | static int rs_write_room(struct tty_struct *tty) | |
819 | { | |
820 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
821 | int ret; | |
822 | ||
823 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) | |
824 | return 0; | |
825 | ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; | |
826 | if (ret < 0) | |
827 | ret = 0; | |
828 | return ret; | |
829 | } | |
830 | ||
831 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
832 | { | |
833 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
834 | ||
835 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) | |
836 | return 0; | |
837 | return info->xmit_cnt; | |
838 | } | |
839 | ||
840 | static void rs_flush_buffer(struct tty_struct *tty) | |
841 | { | |
842 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
843 | ||
844 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) | |
845 | return; | |
846 | cli(); | |
847 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; | |
848 | sti(); | |
849 | tty_wakeup(tty); | |
850 | } | |
851 | ||
852 | /* | |
853 | * ------------------------------------------------------------ | |
854 | * rs_throttle() | |
855 | * | |
856 | * This routine is called by the upper-layer tty layer to signal that | |
857 | * incoming characters should be throttled. | |
858 | * ------------------------------------------------------------ | |
859 | */ | |
860 | static void rs_throttle(struct tty_struct * tty) | |
861 | { | |
862 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
863 | ||
864 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) | |
865 | return; | |
866 | ||
867 | if (I_IXOFF(tty)) | |
868 | info->x_char = STOP_CHAR(tty); | |
869 | ||
870 | /* Turn off RTS line (do this atomic) */ | |
871 | } | |
872 | ||
873 | static void rs_unthrottle(struct tty_struct * tty) | |
874 | { | |
875 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
876 | ||
877 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) | |
878 | return; | |
879 | ||
880 | if (I_IXOFF(tty)) { | |
881 | if (info->x_char) | |
882 | info->x_char = 0; | |
883 | else | |
884 | info->x_char = START_CHAR(tty); | |
885 | } | |
886 | ||
887 | /* Assert RTS line (do this atomic) */ | |
888 | } | |
889 | ||
890 | /* | |
891 | * ------------------------------------------------------------ | |
892 | * rs_ioctl() and friends | |
893 | * ------------------------------------------------------------ | |
894 | */ | |
895 | ||
896 | static int get_serial_info(struct m68k_serial * info, | |
897 | struct serial_struct * retinfo) | |
898 | { | |
899 | struct serial_struct tmp; | |
900 | ||
901 | if (!retinfo) | |
902 | return -EFAULT; | |
903 | memset(&tmp, 0, sizeof(tmp)); | |
904 | tmp.type = info->type; | |
905 | tmp.line = info->line; | |
906 | tmp.port = info->port; | |
907 | tmp.irq = info->irq; | |
908 | tmp.flags = info->flags; | |
909 | tmp.baud_base = info->baud_base; | |
910 | tmp.close_delay = info->close_delay; | |
911 | tmp.closing_wait = info->closing_wait; | |
912 | tmp.custom_divisor = info->custom_divisor; | |
913 | copy_to_user(retinfo,&tmp,sizeof(*retinfo)); | |
914 | return 0; | |
915 | } | |
916 | ||
917 | static int set_serial_info(struct m68k_serial * info, | |
918 | struct serial_struct * new_info) | |
919 | { | |
920 | struct serial_struct new_serial; | |
921 | struct m68k_serial old_info; | |
922 | int retval = 0; | |
923 | ||
924 | if (!new_info) | |
925 | return -EFAULT; | |
926 | copy_from_user(&new_serial,new_info,sizeof(new_serial)); | |
927 | old_info = *info; | |
928 | ||
929 | if (!capable(CAP_SYS_ADMIN)) { | |
930 | if ((new_serial.baud_base != info->baud_base) || | |
931 | (new_serial.type != info->type) || | |
932 | (new_serial.close_delay != info->close_delay) || | |
933 | ((new_serial.flags & ~S_USR_MASK) != | |
934 | (info->flags & ~S_USR_MASK))) | |
935 | return -EPERM; | |
936 | info->flags = ((info->flags & ~S_USR_MASK) | | |
937 | (new_serial.flags & S_USR_MASK)); | |
938 | info->custom_divisor = new_serial.custom_divisor; | |
939 | goto check_and_exit; | |
940 | } | |
941 | ||
942 | if (info->count > 1) | |
943 | return -EBUSY; | |
944 | ||
945 | /* | |
946 | * OK, past this point, all the error checking has been done. | |
947 | * At this point, we start making changes..... | |
948 | */ | |
949 | ||
950 | info->baud_base = new_serial.baud_base; | |
951 | info->flags = ((info->flags & ~S_FLAGS) | | |
952 | (new_serial.flags & S_FLAGS)); | |
953 | info->type = new_serial.type; | |
954 | info->close_delay = new_serial.close_delay; | |
955 | info->closing_wait = new_serial.closing_wait; | |
956 | ||
957 | check_and_exit: | |
958 | retval = startup(info); | |
959 | return retval; | |
960 | } | |
961 | ||
962 | /* | |
963 | * get_lsr_info - get line status register info | |
964 | * | |
965 | * Purpose: Let user call ioctl() to get info when the UART physically | |
966 | * is emptied. On bus types like RS485, the transmitter must | |
967 | * release the bus after transmitting. This must be done when | |
968 | * the transmit shift register is empty, not be done when the | |
969 | * transmit holding register is empty. This functionality | |
970 | * allows an RS485 driver to be written in user space. | |
971 | */ | |
972 | static int get_lsr_info(struct m68k_serial * info, unsigned int *value) | |
973 | { | |
974 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
975 | m68328_uart *uart = &uart_addr[info->line]; | |
976 | #endif | |
977 | unsigned char status; | |
978 | ||
979 | cli(); | |
980 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
981 | status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0; | |
982 | #else | |
983 | status = 0; | |
984 | #endif | |
985 | sti(); | |
986 | put_user(status,value); | |
987 | return 0; | |
988 | } | |
989 | ||
990 | /* | |
991 | * This routine sends a break character out the serial port. | |
992 | */ | |
6a72c7ba | 993 | static void send_break(struct m68k_serial * info, unsigned int duration) |
1da177e4 LT |
994 | { |
995 | m68328_uart *uart = &uart_addr[info->line]; | |
996 | unsigned long flags; | |
997 | if (!info->port) | |
998 | return; | |
1da177e4 LT |
999 | save_flags(flags); |
1000 | cli(); | |
1001 | #ifdef USE_INTS | |
1002 | uart->utx.w |= UTX_SEND_BREAK; | |
6a72c7ba | 1003 | msleep_interruptible(duration); |
1da177e4 LT |
1004 | uart->utx.w &= ~UTX_SEND_BREAK; |
1005 | #endif | |
1006 | restore_flags(flags); | |
1007 | } | |
1008 | ||
1009 | static int rs_ioctl(struct tty_struct *tty, struct file * file, | |
1010 | unsigned int cmd, unsigned long arg) | |
1011 | { | |
1012 | int error; | |
1013 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1014 | int retval; | |
1015 | ||
1016 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
1017 | return -ENODEV; | |
1018 | ||
1019 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
1020 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && | |
1021 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { | |
1022 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1023 | return -EIO; | |
1024 | } | |
1025 | ||
1026 | switch (cmd) { | |
1027 | case TCSBRK: /* SVID version: non-zero arg --> no break */ | |
1028 | retval = tty_check_change(tty); | |
1029 | if (retval) | |
1030 | return retval; | |
1031 | tty_wait_until_sent(tty, 0); | |
1032 | if (!arg) | |
6a72c7ba | 1033 | send_break(info, 250); /* 1/4 second */ |
1da177e4 LT |
1034 | return 0; |
1035 | case TCSBRKP: /* support for POSIX tcsendbreak() */ | |
1036 | retval = tty_check_change(tty); | |
1037 | if (retval) | |
1038 | return retval; | |
1039 | tty_wait_until_sent(tty, 0); | |
6a72c7ba | 1040 | send_break(info, arg ? arg*(100) : 250); |
1da177e4 LT |
1041 | return 0; |
1042 | case TIOCGSOFTCAR: | |
1043 | error = put_user(C_CLOCAL(tty) ? 1 : 0, | |
1044 | (unsigned long *) arg); | |
1045 | if (error) | |
1046 | return error; | |
1047 | return 0; | |
1048 | case TIOCSSOFTCAR: | |
1049 | get_user(arg, (unsigned long *) arg); | |
1050 | tty->termios->c_cflag = | |
1051 | ((tty->termios->c_cflag & ~CLOCAL) | | |
1052 | (arg ? CLOCAL : 0)); | |
1053 | return 0; | |
1054 | case TIOCGSERIAL: | |
1055 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
1056 | sizeof(struct serial_struct))) | |
1057 | return get_serial_info(info, | |
1058 | (struct serial_struct *) arg); | |
1059 | return -EFAULT; | |
1060 | case TIOCSSERIAL: | |
1061 | return set_serial_info(info, | |
1062 | (struct serial_struct *) arg); | |
1063 | case TIOCSERGETLSR: /* Get line status register */ | |
1064 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
1065 | sizeof(unsigned int)); | |
1066 | return get_lsr_info(info, (unsigned int *) arg); | |
1067 | return -EFAULT; | |
1068 | case TIOCSERGSTRUCT: | |
1069 | if (!access_ok(VERIFY_WRITE, (void *) arg, | |
1070 | sizeof(struct m68k_serial))) | |
1071 | return -EFAULT; | |
1072 | copy_to_user((struct m68k_serial *) arg, | |
1073 | info, sizeof(struct m68k_serial)); | |
1074 | return 0; | |
1075 | ||
1076 | default: | |
1077 | return -ENOIOCTLCMD; | |
1078 | } | |
1079 | return 0; | |
1080 | } | |
1081 | ||
1082 | static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios) | |
1083 | { | |
1084 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
1085 | ||
1086 | if (tty->termios->c_cflag == old_termios->c_cflag) | |
1087 | return; | |
1088 | ||
1089 | change_speed(info); | |
1090 | ||
1091 | if ((old_termios->c_cflag & CRTSCTS) && | |
1092 | !(tty->termios->c_cflag & CRTSCTS)) { | |
1093 | tty->hw_stopped = 0; | |
1094 | rs_start(tty); | |
1095 | } | |
1096 | ||
1097 | } | |
1098 | ||
1099 | /* | |
1100 | * ------------------------------------------------------------ | |
1101 | * rs_close() | |
1102 | * | |
1103 | * This routine is called when the serial port gets closed. First, we | |
1104 | * wait for the last remaining data to be sent. Then, we unlink its | |
1105 | * S structure from the interrupt chain if necessary, and we free | |
1106 | * that IRQ if nothing is left in the chain. | |
1107 | * ------------------------------------------------------------ | |
1108 | */ | |
1109 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
1110 | { | |
1111 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1112 | m68328_uart *uart = &uart_addr[info->line]; | |
1113 | unsigned long flags; | |
1114 | ||
1115 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) | |
1116 | return; | |
1117 | ||
1118 | save_flags(flags); cli(); | |
1119 | ||
1120 | if (tty_hung_up_p(filp)) { | |
1121 | restore_flags(flags); | |
1122 | return; | |
1123 | } | |
1124 | ||
1125 | if ((tty->count == 1) && (info->count != 1)) { | |
1126 | /* | |
1127 | * Uh, oh. tty->count is 1, which means that the tty | |
1128 | * structure will be freed. Info->count should always | |
1129 | * be one in these conditions. If it's greater than | |
1130 | * one, we've got real problems, since it means the | |
1131 | * serial port won't be shutdown. | |
1132 | */ | |
1133 | printk("rs_close: bad serial port count; tty->count is 1, " | |
1134 | "info->count is %d\n", info->count); | |
1135 | info->count = 1; | |
1136 | } | |
1137 | if (--info->count < 0) { | |
1138 | printk("rs_close: bad serial port count for ttyS%d: %d\n", | |
1139 | info->line, info->count); | |
1140 | info->count = 0; | |
1141 | } | |
1142 | if (info->count) { | |
1143 | restore_flags(flags); | |
1144 | return; | |
1145 | } | |
1146 | info->flags |= S_CLOSING; | |
1147 | /* | |
1148 | * Now we wait for the transmit buffer to clear; and we notify | |
1149 | * the line discipline to only process XON/XOFF characters. | |
1150 | */ | |
1151 | tty->closing = 1; | |
1152 | if (info->closing_wait != S_CLOSING_WAIT_NONE) | |
1153 | tty_wait_until_sent(tty, info->closing_wait); | |
1154 | /* | |
1155 | * At this point we stop accepting input. To do this, we | |
1156 | * disable the receive line status interrupts, and tell the | |
1157 | * interrupt driver to stop checking the data ready bit in the | |
1158 | * line status register. | |
1159 | */ | |
1160 | ||
1161 | uart->ustcnt &= ~USTCNT_RXEN; | |
1162 | uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK); | |
1163 | ||
1164 | shutdown(info); | |
1165 | if (tty->driver->flush_buffer) | |
1166 | tty->driver->flush_buffer(tty); | |
1167 | ||
1168 | tty_ldisc_flush(tty); | |
1169 | tty->closing = 0; | |
1170 | info->event = 0; | |
1171 | info->tty = 0; | |
1172 | #warning "This is not and has never been valid so fix it" | |
1173 | #if 0 | |
1174 | if (tty->ldisc.num != ldiscs[N_TTY].num) { | |
1175 | if (tty->ldisc.close) | |
1176 | (tty->ldisc.close)(tty); | |
1177 | tty->ldisc = ldiscs[N_TTY]; | |
1178 | tty->termios->c_line = N_TTY; | |
1179 | if (tty->ldisc.open) | |
1180 | (tty->ldisc.open)(tty); | |
1181 | } | |
1182 | #endif | |
1183 | if (info->blocked_open) { | |
1184 | if (info->close_delay) { | |
1185 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); | |
1186 | } | |
1187 | wake_up_interruptible(&info->open_wait); | |
1188 | } | |
1189 | info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING); | |
1190 | wake_up_interruptible(&info->close_wait); | |
1191 | restore_flags(flags); | |
1192 | } | |
1193 | ||
1194 | /* | |
1195 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
1196 | */ | |
1197 | void rs_hangup(struct tty_struct *tty) | |
1198 | { | |
1199 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1200 | ||
1201 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) | |
1202 | return; | |
1203 | ||
1204 | rs_flush_buffer(tty); | |
1205 | shutdown(info); | |
1206 | info->event = 0; | |
1207 | info->count = 0; | |
1208 | info->flags &= ~S_NORMAL_ACTIVE; | |
1209 | info->tty = 0; | |
1210 | wake_up_interruptible(&info->open_wait); | |
1211 | } | |
1212 | ||
1213 | /* | |
1214 | * ------------------------------------------------------------ | |
1215 | * rs_open() and friends | |
1216 | * ------------------------------------------------------------ | |
1217 | */ | |
1218 | static int block_til_ready(struct tty_struct *tty, struct file * filp, | |
1219 | struct m68k_serial *info) | |
1220 | { | |
1221 | DECLARE_WAITQUEUE(wait, current); | |
1222 | int retval; | |
1223 | int do_clocal = 0; | |
1224 | ||
1225 | /* | |
1226 | * If the device is in the middle of being closed, then block | |
1227 | * until it's done, and then try again. | |
1228 | */ | |
1229 | if (info->flags & S_CLOSING) { | |
1230 | interruptible_sleep_on(&info->close_wait); | |
1231 | #ifdef SERIAL_DO_RESTART | |
1232 | if (info->flags & S_HUP_NOTIFY) | |
1233 | return -EAGAIN; | |
1234 | else | |
1235 | return -ERESTARTSYS; | |
1236 | #else | |
1237 | return -EAGAIN; | |
1238 | #endif | |
1239 | } | |
1240 | ||
1241 | /* | |
1242 | * If non-blocking mode is set, or the port is not enabled, | |
1243 | * then make the check up front and then exit. | |
1244 | */ | |
1245 | if ((filp->f_flags & O_NONBLOCK) || | |
1246 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
1247 | info->flags |= S_NORMAL_ACTIVE; | |
1248 | return 0; | |
1249 | } | |
1250 | ||
1251 | if (tty->termios->c_cflag & CLOCAL) | |
1252 | do_clocal = 1; | |
1253 | ||
1254 | /* | |
1255 | * Block waiting for the carrier detect and the line to become | |
1256 | * free (i.e., not in use by the callout). While we are in | |
1257 | * this loop, info->count is dropped by one, so that | |
1258 | * rs_close() knows when to free things. We restore it upon | |
1259 | * exit, either normal or abnormal. | |
1260 | */ | |
1261 | retval = 0; | |
1262 | add_wait_queue(&info->open_wait, &wait); | |
1263 | ||
1264 | info->count--; | |
1265 | info->blocked_open++; | |
1266 | while (1) { | |
1267 | cli(); | |
1268 | m68k_rtsdtr(info, 1); | |
1269 | sti(); | |
1270 | current->state = TASK_INTERRUPTIBLE; | |
1271 | if (tty_hung_up_p(filp) || | |
1272 | !(info->flags & S_INITIALIZED)) { | |
1273 | #ifdef SERIAL_DO_RESTART | |
1274 | if (info->flags & S_HUP_NOTIFY) | |
1275 | retval = -EAGAIN; | |
1276 | else | |
1277 | retval = -ERESTARTSYS; | |
1278 | #else | |
1279 | retval = -EAGAIN; | |
1280 | #endif | |
1281 | break; | |
1282 | } | |
1283 | if (!(info->flags & S_CLOSING) && do_clocal) | |
1284 | break; | |
1285 | if (signal_pending(current)) { | |
1286 | retval = -ERESTARTSYS; | |
1287 | break; | |
1288 | } | |
1289 | schedule(); | |
1290 | } | |
1291 | current->state = TASK_RUNNING; | |
1292 | remove_wait_queue(&info->open_wait, &wait); | |
1293 | if (!tty_hung_up_p(filp)) | |
1294 | info->count++; | |
1295 | info->blocked_open--; | |
1296 | ||
1297 | if (retval) | |
1298 | return retval; | |
1299 | info->flags |= S_NORMAL_ACTIVE; | |
1300 | return 0; | |
1301 | } | |
1302 | ||
1303 | /* | |
1304 | * This routine is called whenever a serial port is opened. It | |
1305 | * enables interrupts for a serial port, linking in its S structure into | |
1306 | * the IRQ chain. It also performs the serial-specific | |
1307 | * initialization for the tty structure. | |
1308 | */ | |
1309 | int rs_open(struct tty_struct *tty, struct file * filp) | |
1310 | { | |
1311 | struct m68k_serial *info; | |
1312 | int retval, line; | |
1313 | ||
1314 | line = tty->index; | |
1315 | ||
1316 | if (line >= NR_PORTS || line < 0) /* we have exactly one */ | |
1317 | return -ENODEV; | |
1318 | ||
1319 | info = &m68k_soft[line]; | |
1320 | ||
1321 | if (serial_paranoia_check(info, tty->name, "rs_open")) | |
1322 | return -ENODEV; | |
1323 | ||
1324 | info->count++; | |
1325 | tty->driver_data = info; | |
1326 | info->tty = tty; | |
1327 | ||
1328 | /* | |
1329 | * Start up serial port | |
1330 | */ | |
1331 | retval = startup(info); | |
1332 | if (retval) | |
1333 | return retval; | |
1334 | ||
1335 | return block_til_ready(tty, filp, info); | |
1336 | } | |
1337 | ||
1338 | /* Finally, routines used to initialize the serial driver. */ | |
1339 | ||
1340 | static void show_serial_version(void) | |
1341 | { | |
1342 | printk("MC68328 serial driver version 1.00\n"); | |
1343 | } | |
1344 | ||
bca73e4b | 1345 | #ifdef CONFIG_PM_LEGACY |
1da177e4 LT |
1346 | /* Serial Power management |
1347 | * The console (currently fixed at line 0) is a special case for power | |
1348 | * management because the kernel is so chatty. The console will be | |
1349 | * explicitly disabled my our power manager as the last minute, so we won't | |
1350 | * mess with it here. | |
1351 | */ | |
1352 | static struct pm_dev *serial_pm[NR_PORTS]; | |
1353 | ||
1354 | static int serial_pm_callback(struct pm_dev *dev, pm_request_t request, void *data) | |
1355 | { | |
1356 | struct m68k_serial *info = (struct m68k_serial *)dev->data; | |
1357 | ||
1358 | if(info == NULL) | |
1359 | return -1; | |
1360 | ||
1361 | /* special case for line 0 - pm restores it */ | |
1362 | if(info->line == 0) | |
1363 | return 0; | |
1364 | ||
1365 | switch (request) { | |
1366 | case PM_SUSPEND: | |
1367 | shutdown(info); | |
1368 | break; | |
1369 | ||
1370 | case PM_RESUME: | |
1371 | startup(info); | |
1372 | break; | |
1373 | } | |
1374 | return 0; | |
1375 | } | |
1376 | ||
1377 | void shutdown_console(void) | |
1378 | { | |
1379 | struct m68k_serial *info = &m68k_soft[0]; | |
1380 | ||
1381 | /* HACK: wait a bit for any pending printk's to be dumped */ | |
1382 | { | |
1383 | int i = 10000; | |
1384 | while(i--); | |
1385 | } | |
1386 | ||
1387 | shutdown(info); | |
1388 | } | |
1389 | ||
1390 | void startup_console(void) | |
1391 | { | |
1392 | struct m68k_serial *info = &m68k_soft[0]; | |
1393 | startup(info); | |
1394 | } | |
bca73e4b | 1395 | #endif /* CONFIG_PM_LEGACY */ |
1da177e4 LT |
1396 | |
1397 | ||
1398 | static struct tty_operations rs_ops = { | |
1399 | .open = rs_open, | |
1400 | .close = rs_close, | |
1401 | .write = rs_write, | |
1402 | .flush_chars = rs_flush_chars, | |
1403 | .write_room = rs_write_room, | |
1404 | .chars_in_buffer = rs_chars_in_buffer, | |
1405 | .flush_buffer = rs_flush_buffer, | |
1406 | .ioctl = rs_ioctl, | |
1407 | .throttle = rs_throttle, | |
1408 | .unthrottle = rs_unthrottle, | |
1409 | .set_termios = rs_set_termios, | |
1410 | .stop = rs_stop, | |
1411 | .start = rs_start, | |
1412 | .hangup = rs_hangup, | |
1413 | .set_ldisc = rs_set_ldisc, | |
1414 | }; | |
1415 | ||
1416 | /* rs_init inits the driver */ | |
1417 | static int __init | |
1418 | rs68328_init(void) | |
1419 | { | |
1420 | int flags, i; | |
1421 | struct m68k_serial *info; | |
1422 | ||
1423 | serial_driver = alloc_tty_driver(NR_PORTS); | |
1424 | if (!serial_driver) | |
1425 | return -ENOMEM; | |
1426 | ||
1427 | show_serial_version(); | |
1428 | ||
1429 | /* Initialize the tty_driver structure */ | |
1430 | /* SPARC: Not all of this is exactly right for us. */ | |
1431 | ||
1432 | serial_driver->name = "ttyS"; | |
1433 | serial_driver->major = TTY_MAJOR; | |
1434 | serial_driver->minor_start = 64; | |
1435 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
1436 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
1437 | serial_driver->init_termios = tty_std_termios; | |
1438 | serial_driver->init_termios.c_cflag = | |
1439 | m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL; | |
1440 | serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
1441 | tty_set_operations(serial_driver, &rs_ops); | |
1442 | ||
1443 | if (tty_register_driver(serial_driver)) { | |
1444 | put_tty_driver(serial_driver); | |
1445 | printk(KERN_ERR "Couldn't register serial driver\n"); | |
1446 | return -ENOMEM; | |
1447 | } | |
1448 | ||
1449 | save_flags(flags); cli(); | |
1450 | ||
1451 | for(i=0;i<NR_PORTS;i++) { | |
1452 | ||
1453 | info = &m68k_soft[i]; | |
1454 | info->magic = SERIAL_MAGIC; | |
1455 | info->port = (int) &uart_addr[i]; | |
1456 | info->tty = 0; | |
1457 | info->irq = uart_irqs[i]; | |
1458 | info->custom_divisor = 16; | |
1459 | info->close_delay = 50; | |
1460 | info->closing_wait = 3000; | |
1461 | info->x_char = 0; | |
1462 | info->event = 0; | |
1463 | info->count = 0; | |
1464 | info->blocked_open = 0; | |
1465 | INIT_WORK(&info->tqueue, do_softint, info); | |
1466 | INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info); | |
1467 | init_waitqueue_head(&info->open_wait); | |
1468 | init_waitqueue_head(&info->close_wait); | |
1469 | info->line = i; | |
1470 | info->is_cons = 1; /* Means shortcuts work */ | |
1471 | ||
1472 | printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line, | |
1473 | info->port, info->irq); | |
1474 | printk(" is a builtin MC68328 UART\n"); | |
1475 | ||
1476 | IRQ_ports[info->irq] = info; /* waste of space */ | |
1477 | ||
1478 | #ifdef CONFIG_M68VZ328 | |
1479 | if (i > 0 ) | |
1480 | PJSEL &= 0xCF; /* PSW enable second port output */ | |
1481 | #endif | |
1482 | ||
1483 | if (request_irq(uart_irqs[i], | |
1484 | rs_interrupt, | |
1485 | IRQ_FLG_STD, | |
1486 | "M68328_UART", NULL)) | |
1487 | panic("Unable to attach 68328 serial interrupt\n"); | |
bca73e4b | 1488 | #ifdef CONFIG_PM_LEGACY |
1da177e4 LT |
1489 | serial_pm[i] = pm_register(PM_SYS_DEV, PM_SYS_COM, serial_pm_callback); |
1490 | if (serial_pm[i]) | |
1491 | serial_pm[i]->data = info; | |
1492 | #endif | |
1493 | } | |
1494 | restore_flags(flags); | |
1495 | return 0; | |
1496 | } | |
1497 | ||
1da177e4 LT |
1498 | module_init(rs68328_init); |
1499 | ||
1500 | ||
1501 | ||
1502 | static void m68328_set_baud(void) | |
1503 | { | |
1504 | unsigned short ustcnt; | |
1505 | int i; | |
1506 | ||
1507 | ustcnt = USTCNT; | |
1508 | USTCNT = ustcnt & ~USTCNT_TXEN; | |
1509 | ||
1510 | again: | |
1511 | for (i = 0; i < sizeof(baud_table) / sizeof(baud_table[0]); i++) | |
1512 | if (baud_table[i] == m68328_console_baud) | |
1513 | break; | |
1514 | if (i >= sizeof(baud_table) / sizeof(baud_table[0])) { | |
1515 | m68328_console_baud = 9600; | |
1516 | goto again; | |
1517 | } | |
1518 | ||
1519 | UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
1520 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
1521 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
1522 | ustcnt |= USTCNT_8_7; | |
1523 | ustcnt |= USTCNT_TXEN; | |
1524 | USTCNT = ustcnt; | |
1525 | m68328_console_initted = 1; | |
1526 | return; | |
1527 | } | |
1528 | ||
1529 | ||
1530 | int m68328_console_setup(struct console *cp, char *arg) | |
1531 | { | |
1532 | int i, n = CONSOLE_BAUD_RATE; | |
1533 | ||
1534 | if (!cp) | |
1535 | return(-1); | |
1536 | ||
1537 | if (arg) | |
1538 | n = simple_strtoul(arg,NULL,0); | |
1539 | ||
1540 | for (i = 0; i < BAUD_TABLE_SIZE; i++) | |
1541 | if (baud_table[i] == n) | |
1542 | break; | |
1543 | if (i < BAUD_TABLE_SIZE) { | |
1544 | m68328_console_baud = n; | |
1545 | m68328_console_cbaud = 0; | |
1546 | if (i > 15) { | |
1547 | m68328_console_cbaud |= CBAUDEX; | |
1548 | i -= 15; | |
1549 | } | |
1550 | m68328_console_cbaud |= i; | |
1551 | } | |
1552 | ||
1553 | m68328_set_baud(); /* make sure baud rate changes */ | |
1554 | return(0); | |
1555 | } | |
1556 | ||
1557 | ||
1558 | static struct tty_driver *m68328_console_device(struct console *c, int *index) | |
1559 | { | |
1560 | *index = c->index; | |
1561 | return serial_driver; | |
1562 | } | |
1563 | ||
1564 | ||
1565 | void m68328_console_write (struct console *co, const char *str, | |
1566 | unsigned int count) | |
1567 | { | |
1568 | if (!m68328_console_initted) | |
1569 | m68328_set_baud(); | |
1570 | while (count--) { | |
1571 | if (*str == '\n') | |
1572 | rs_put_char('\r'); | |
1573 | rs_put_char( *str++ ); | |
1574 | } | |
1575 | } | |
1576 | ||
1577 | ||
1578 | static struct console m68328_driver = { | |
1579 | .name = "ttyS", | |
1580 | .write = m68328_console_write, | |
1581 | .device = m68328_console_device, | |
1582 | .setup = m68328_console_setup, | |
1583 | .flags = CON_PRINTBUFFER, | |
1584 | .index = -1, | |
1585 | }; | |
1586 | ||
1587 | ||
1588 | static int __init m68328_console_init(void) | |
1589 | { | |
1590 | register_console(&m68328_driver); | |
1591 | return 0; | |
1592 | } | |
1593 | ||
1594 | console_initcall(m68328_console_init); |