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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/major.h> |
27 | #include <linux/string.h> |
28 | #include <linux/fcntl.h> |
29 | #include <linux/mm.h> |
30 | #include <linux/kernel.h> |
31 | #include <linux/console.h> |
32 | #include <linux/reboot.h> |
33 | #include <linux/keyboard.h> |
34 | #include <linux/init.h> |
35 | #include <linux/pm.h> |
36 | #include <linux/bitops.h> |
37 | #include <linux/delay.h> |
38 | #include <linux/gfp.h> |
39 | |
40 | #include <asm/io.h> |
41 | #include <asm/irq.h> |
42 | #include <asm/system.h> |
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 | |
71 | static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS; |
72 | |
73 | /* multiple ports are contiguous in memory */ |
74 | m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR; |
75 | |
76 | struct tty_struct m68k_ttys; |
77 | struct m68k_serial *m68k_consinfo = 0; |
78 | |
79 | #define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */ |
80 | |
81 | #ifdef CONFIG_CONSOLE |
82 | extern wait_queue_head_t keypress_wait; |
83 | #endif |
84 | |
85 | struct tty_driver *serial_driver; |
86 | |
87 | /* number of characters left in xmit buffer before we ask for more */ |
88 | #define WAKEUP_CHARS 256 |
89 | |
90 | /* Debugging... DEBUG_INTR is bad to use when one of the zs |
91 | * lines is your console ;( |
92 | */ |
93 | #undef SERIAL_DEBUG_INTR |
94 | #undef SERIAL_DEBUG_OPEN |
95 | #undef SERIAL_DEBUG_FLOW |
96 | |
97 | #define RS_ISR_PASS_LIMIT 256 |
98 | |
99 | static void change_speed(struct m68k_serial *info); |
100 | |
101 | /* |
102 | * Setup for console. Argument comes from the boot command line. |
103 | */ |
104 | |
105 | #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ) |
106 | #define CONSOLE_BAUD_RATE 115200 |
107 | #define DEFAULT_CBAUD B115200 |
108 | #else |
109 | /* (es) */ |
110 | /* note: this is messy, but it works, again, perhaps defined somewhere else?*/ |
111 | #ifdef CONFIG_M68VZ328 |
112 | #define CONSOLE_BAUD_RATE 19200 |
113 | #define DEFAULT_CBAUD B19200 |
114 | #endif |
115 | /* (/es) */ |
116 | #endif |
117 | |
118 | #ifndef CONSOLE_BAUD_RATE |
119 | #define CONSOLE_BAUD_RATE 9600 |
120 | #define DEFAULT_CBAUD B9600 |
121 | #endif |
122 | |
123 | |
124 | static int m68328_console_initted = 0; |
125 | static int m68328_console_baud = CONSOLE_BAUD_RATE; |
126 | static int m68328_console_cbaud = DEFAULT_CBAUD; |
127 | |
128 | |
129 | static inline int serial_paranoia_check(struct m68k_serial *info, |
130 | char *name, const char *routine) |
131 | { |
132 | #ifdef SERIAL_PARANOIA_CHECK |
133 | static const char *badmagic = |
134 | "Warning: bad magic number for serial struct %s in %s\n"; |
135 | static const char *badinfo = |
136 | "Warning: null m68k_serial for %s in %s\n"; |
137 | |
138 | if (!info) { |
139 | printk(badinfo, name, routine); |
140 | return 1; |
141 | } |
142 | if (info->magic != SERIAL_MAGIC) { |
143 | printk(badmagic, name, routine); |
144 | return 1; |
145 | } |
146 | #endif |
147 | return 0; |
148 | } |
149 | |
150 | /* |
151 | * This is used to figure out the divisor speeds and the timeouts |
152 | */ |
153 | static int baud_table[] = { |
154 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, |
155 | 9600, 19200, 38400, 57600, 115200, 0 }; |
156 | |
157 | /* Sets or clears DTR/RTS on the requested line */ |
158 | static inline void m68k_rtsdtr(struct m68k_serial *ss, int set) |
159 | { |
160 | if (set) { |
161 | /* set the RTS/CTS line */ |
162 | } else { |
163 | /* clear it */ |
164 | } |
165 | return; |
166 | } |
167 | |
168 | /* Utility routines */ |
169 | static inline int get_baud(struct m68k_serial *ss) |
170 | { |
171 | unsigned long result = 115200; |
172 | unsigned short int baud = uart_addr[ss->line].ubaud; |
173 | if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400; |
174 | result >>= GET_FIELD(baud, UBAUD_DIVIDE); |
175 | |
176 | return result; |
177 | } |
178 | |
179 | /* |
180 | * ------------------------------------------------------------ |
181 | * rs_stop() and rs_start() |
182 | * |
183 | * This routines are called before setting or resetting tty->stopped. |
184 | * They enable or disable transmitter interrupts, as necessary. |
185 | * ------------------------------------------------------------ |
186 | */ |
187 | static void rs_stop(struct tty_struct *tty) |
188 | { |
189 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
190 | m68328_uart *uart = &uart_addr[info->line]; |
191 | unsigned long flags; |
192 | |
193 | if (serial_paranoia_check(info, tty->name, "rs_stop")) |
194 | return; |
195 | |
196 | local_irq_save(flags); |
197 | uart->ustcnt &= ~USTCNT_TXEN; |
198 | local_irq_restore(flags); |
199 | } |
200 | |
201 | static int rs_put_char(char ch) |
202 | { |
203 | int flags, loops = 0; |
204 | |
205 | local_irq_save(flags); |
206 | |
207 | while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) { |
208 | loops++; |
209 | udelay(5); |
210 | } |
211 | |
212 | UTX_TXDATA = ch; |
213 | udelay(5); |
214 | local_irq_restore(flags); |
215 | return 1; |
216 | } |
217 | |
218 | static void rs_start(struct tty_struct *tty) |
219 | { |
220 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
221 | m68328_uart *uart = &uart_addr[info->line]; |
222 | unsigned long flags; |
223 | |
224 | if (serial_paranoia_check(info, tty->name, "rs_start")) |
225 | return; |
226 | |
227 | local_irq_save(flags); |
228 | if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) { |
229 | #ifdef USE_INTS |
230 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; |
231 | #else |
232 | uart->ustcnt |= USTCNT_TXEN; |
233 | #endif |
234 | } |
235 | local_irq_restore(flags); |
236 | } |
237 | |
238 | /* Drop into either the boot monitor or kadb upon receiving a break |
239 | * from keyboard/console input. |
240 | */ |
241 | static void batten_down_hatches(void) |
242 | { |
243 | /* Drop into the debugger */ |
244 | } |
245 | |
246 | static void status_handle(struct m68k_serial *info, unsigned short status) |
247 | { |
248 | #if 0 |
249 | if(status & DCD) { |
250 | if((info->port.tty->termios->c_cflag & CRTSCTS) && |
251 | ((info->curregs[3] & AUTO_ENAB)==0)) { |
252 | info->curregs[3] |= AUTO_ENAB; |
253 | info->pendregs[3] |= AUTO_ENAB; |
254 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); |
255 | } |
256 | } else { |
257 | if((info->curregs[3] & AUTO_ENAB)) { |
258 | info->curregs[3] &= ~AUTO_ENAB; |
259 | info->pendregs[3] &= ~AUTO_ENAB; |
260 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); |
261 | } |
262 | } |
263 | #endif |
264 | /* If this is console input and this is a |
265 | * 'break asserted' status change interrupt |
266 | * see if we can drop into the debugger |
267 | */ |
268 | if((status & URX_BREAK) && info->break_abort) |
269 | batten_down_hatches(); |
270 | return; |
271 | } |
272 | |
273 | static void receive_chars(struct m68k_serial *info, unsigned short rx) |
274 | { |
275 | struct tty_struct *tty = info->port.tty; |
276 | m68328_uart *uart = &uart_addr[info->line]; |
277 | unsigned char ch, flag; |
278 | |
279 | /* |
280 | * This do { } while() loop will get ALL chars out of Rx FIFO |
281 | */ |
282 | #ifndef CONFIG_XCOPILOT_BUGS |
283 | do { |
284 | #endif |
285 | ch = GET_FIELD(rx, URX_RXDATA); |
286 | |
287 | if(info->is_cons) { |
288 | if(URX_BREAK & rx) { /* whee, break received */ |
289 | status_handle(info, rx); |
290 | return; |
291 | #ifdef CONFIG_MAGIC_SYSRQ |
292 | } else if (ch == 0x10) { /* ^P */ |
293 | show_state(); |
294 | show_free_areas(); |
295 | show_buffers(); |
296 | /* show_net_buffers(); */ |
297 | return; |
298 | } else if (ch == 0x12) { /* ^R */ |
299 | emergency_restart(); |
300 | return; |
301 | #endif /* CONFIG_MAGIC_SYSRQ */ |
302 | } |
303 | /* It is a 'keyboard interrupt' ;-) */ |
304 | #ifdef CONFIG_CONSOLE |
305 | wake_up(&keypress_wait); |
306 | #endif |
307 | } |
308 | |
309 | if(!tty) |
310 | goto clear_and_exit; |
311 | |
312 | flag = TTY_NORMAL; |
313 | |
314 | if(rx & URX_PARITY_ERROR) { |
315 | flag = TTY_PARITY; |
316 | status_handle(info, rx); |
317 | } else if(rx & URX_OVRUN) { |
318 | flag = TTY_OVERRUN; |
319 | status_handle(info, rx); |
320 | } else if(rx & URX_FRAME_ERROR) { |
321 | flag = TTY_FRAME; |
322 | status_handle(info, rx); |
323 | } |
324 | tty_insert_flip_char(tty, ch, flag); |
325 | #ifndef CONFIG_XCOPILOT_BUGS |
326 | } while((rx = uart->urx.w) & URX_DATA_READY); |
327 | #endif |
328 | |
329 | tty_schedule_flip(tty); |
330 | |
331 | clear_and_exit: |
332 | return; |
333 | } |
334 | |
335 | static void transmit_chars(struct m68k_serial *info) |
336 | { |
337 | m68328_uart *uart = &uart_addr[info->line]; |
338 | |
339 | if (info->x_char) { |
340 | /* Send next char */ |
341 | uart->utx.b.txdata = info->x_char; |
342 | info->x_char = 0; |
343 | goto clear_and_return; |
344 | } |
345 | |
346 | if((info->xmit_cnt <= 0) || info->port.tty->stopped) { |
347 | /* That's peculiar... TX ints off */ |
348 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; |
349 | goto clear_and_return; |
350 | } |
351 | |
352 | /* Send char */ |
353 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; |
354 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); |
355 | info->xmit_cnt--; |
356 | |
357 | if (info->xmit_cnt < WAKEUP_CHARS) |
358 | schedule_work(&info->tqueue); |
359 | |
360 | if(info->xmit_cnt <= 0) { |
361 | /* All done for now... TX ints off */ |
362 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; |
363 | goto clear_and_return; |
364 | } |
365 | |
366 | clear_and_return: |
367 | /* Clear interrupt (should be auto)*/ |
368 | return; |
369 | } |
370 | |
371 | /* |
372 | * This is the serial driver's generic interrupt routine |
373 | */ |
374 | irqreturn_t rs_interrupt(int irq, void *dev_id) |
375 | { |
376 | struct m68k_serial *info = dev_id; |
377 | m68328_uart *uart; |
378 | unsigned short rx; |
379 | unsigned short tx; |
380 | |
381 | uart = &uart_addr[info->line]; |
382 | rx = uart->urx.w; |
383 | |
384 | #ifdef USE_INTS |
385 | tx = uart->utx.w; |
386 | |
387 | if (rx & URX_DATA_READY) receive_chars(info, rx); |
388 | if (tx & UTX_TX_AVAIL) transmit_chars(info); |
389 | #else |
390 | receive_chars(info, rx); |
391 | #endif |
392 | return IRQ_HANDLED; |
393 | } |
394 | |
395 | static void do_softint(struct work_struct *work) |
396 | { |
397 | struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue); |
398 | struct tty_struct *tty; |
399 | |
400 | tty = info->port.tty; |
401 | if (!tty) |
402 | return; |
403 | #if 0 |
404 | if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { |
405 | tty_wakeup(tty); |
406 | } |
407 | #endif |
408 | } |
409 | |
410 | /* |
411 | * This routine is called from the scheduler tqueue when the interrupt |
412 | * routine has signalled that a hangup has occurred. The path of |
413 | * hangup processing is: |
414 | * |
415 | * serial interrupt routine -> (scheduler tqueue) -> |
416 | * do_serial_hangup() -> tty->hangup() -> rs_hangup() |
417 | * |
418 | */ |
419 | static void do_serial_hangup(struct work_struct *work) |
420 | { |
421 | struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue_hangup); |
422 | struct tty_struct *tty; |
423 | |
424 | tty = info->port.tty; |
425 | if (!tty) |
426 | return; |
427 | |
428 | tty_hangup(tty); |
429 | } |
430 | |
431 | |
432 | static int startup(struct m68k_serial * info) |
433 | { |
434 | m68328_uart *uart = &uart_addr[info->line]; |
435 | unsigned long flags; |
436 | |
437 | if (info->flags & S_INITIALIZED) |
438 | return 0; |
439 | |
440 | if (!info->xmit_buf) { |
441 | info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL); |
442 | if (!info->xmit_buf) |
443 | return -ENOMEM; |
444 | } |
445 | |
446 | local_irq_save(flags); |
447 | |
448 | /* |
449 | * Clear the FIFO buffers and disable them |
450 | * (they will be reenabled in change_speed()) |
451 | */ |
452 | |
453 | uart->ustcnt = USTCNT_UEN; |
454 | info->xmit_fifo_size = 1; |
455 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN; |
456 | (void)uart->urx.w; |
457 | |
458 | /* |
459 | * Finally, enable sequencing and interrupts |
460 | */ |
461 | #ifdef USE_INTS |
462 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | |
463 | USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK; |
464 | #else |
465 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK; |
466 | #endif |
467 | |
468 | if (info->port.tty) |
469 | clear_bit(TTY_IO_ERROR, &info->port.tty->flags); |
470 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
471 | |
472 | /* |
473 | * and set the speed of the serial port |
474 | */ |
475 | |
476 | change_speed(info); |
477 | |
478 | info->flags |= S_INITIALIZED; |
479 | local_irq_restore(flags); |
480 | return 0; |
481 | } |
482 | |
483 | /* |
484 | * This routine will shutdown a serial port; interrupts are disabled, and |
485 | * DTR is dropped if the hangup on close termio flag is on. |
486 | */ |
487 | static void shutdown(struct m68k_serial * info) |
488 | { |
489 | m68328_uart *uart = &uart_addr[info->line]; |
490 | unsigned long flags; |
491 | |
492 | uart->ustcnt = 0; /* All off! */ |
493 | if (!(info->flags & S_INITIALIZED)) |
494 | return; |
495 | |
496 | local_irq_save(flags); |
497 | |
498 | if (info->xmit_buf) { |
499 | free_page((unsigned long) info->xmit_buf); |
500 | info->xmit_buf = 0; |
501 | } |
502 | |
503 | if (info->port.tty) |
504 | set_bit(TTY_IO_ERROR, &info->port.tty->flags); |
505 | |
506 | info->flags &= ~S_INITIALIZED; |
507 | local_irq_restore(flags); |
508 | } |
509 | |
510 | struct { |
511 | int divisor, prescale; |
512 | } |
513 | #ifndef CONFIG_M68VZ328 |
514 | hw_baud_table[18] = { |
515 | {0,0}, /* 0 */ |
516 | {0,0}, /* 50 */ |
517 | {0,0}, /* 75 */ |
518 | {0,0}, /* 110 */ |
519 | {0,0}, /* 134 */ |
520 | {0,0}, /* 150 */ |
521 | {0,0}, /* 200 */ |
522 | {7,0x26}, /* 300 */ |
523 | {6,0x26}, /* 600 */ |
524 | {5,0x26}, /* 1200 */ |
525 | {0,0}, /* 1800 */ |
526 | {4,0x26}, /* 2400 */ |
527 | {3,0x26}, /* 4800 */ |
528 | {2,0x26}, /* 9600 */ |
529 | {1,0x26}, /* 19200 */ |
530 | {0,0x26}, /* 38400 */ |
531 | {1,0x38}, /* 57600 */ |
532 | {0,0x38}, /* 115200 */ |
533 | }; |
534 | #else |
535 | hw_baud_table[18] = { |
536 | {0,0}, /* 0 */ |
537 | {0,0}, /* 50 */ |
538 | {0,0}, /* 75 */ |
539 | {0,0}, /* 110 */ |
540 | {0,0}, /* 134 */ |
541 | {0,0}, /* 150 */ |
542 | {0,0}, /* 200 */ |
543 | {0,0}, /* 300 */ |
544 | {7,0x26}, /* 600 */ |
545 | {6,0x26}, /* 1200 */ |
546 | {0,0}, /* 1800 */ |
547 | {5,0x26}, /* 2400 */ |
548 | {4,0x26}, /* 4800 */ |
549 | {3,0x26}, /* 9600 */ |
550 | {2,0x26}, /* 19200 */ |
551 | {1,0x26}, /* 38400 */ |
552 | {0,0x26}, /* 57600 */ |
553 | {1,0x38}, /* 115200 */ |
554 | }; |
555 | #endif |
556 | /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */ |
557 | |
558 | /* |
559 | * This routine is called to set the UART divisor registers to match |
560 | * the specified baud rate for a serial port. |
561 | */ |
562 | static void change_speed(struct m68k_serial *info) |
563 | { |
564 | m68328_uart *uart = &uart_addr[info->line]; |
565 | unsigned short port; |
566 | unsigned short ustcnt; |
567 | unsigned cflag; |
568 | int i; |
569 | |
570 | if (!info->port.tty || !info->port.tty->termios) |
571 | return; |
572 | cflag = info->port.tty->termios->c_cflag; |
573 | if (!(port = info->port)) |
574 | return; |
575 | |
576 | ustcnt = uart->ustcnt; |
577 | uart->ustcnt = ustcnt & ~USTCNT_TXEN; |
578 | |
579 | i = cflag & CBAUD; |
580 | if (i & CBAUDEX) { |
581 | i = (i & ~CBAUDEX) + B38400; |
582 | } |
583 | |
584 | info->baud = baud_table[i]; |
585 | uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | |
586 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); |
587 | |
588 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); |
589 | |
590 | if ((cflag & CSIZE) == CS8) |
591 | ustcnt |= USTCNT_8_7; |
592 | |
593 | if (cflag & CSTOPB) |
594 | ustcnt |= USTCNT_STOP; |
595 | |
596 | if (cflag & PARENB) |
597 | ustcnt |= USTCNT_PARITYEN; |
598 | if (cflag & PARODD) |
599 | ustcnt |= USTCNT_ODD_EVEN; |
600 | |
601 | #ifdef CONFIG_SERIAL_68328_RTS_CTS |
602 | if (cflag & CRTSCTS) { |
603 | uart->utx.w &= ~ UTX_NOCTS; |
604 | } else { |
605 | uart->utx.w |= UTX_NOCTS; |
606 | } |
607 | #endif |
608 | |
609 | ustcnt |= USTCNT_TXEN; |
610 | |
611 | uart->ustcnt = ustcnt; |
612 | return; |
613 | } |
614 | |
615 | /* |
616 | * Fair output driver allows a process to speak. |
617 | */ |
618 | static void rs_fair_output(void) |
619 | { |
620 | int left; /* Output no more than that */ |
621 | unsigned long flags; |
622 | struct m68k_serial *info = &m68k_soft[0]; |
623 | char c; |
624 | |
625 | if (info == 0) return; |
626 | if (info->xmit_buf == 0) return; |
627 | |
628 | local_irq_save(flags); |
629 | left = info->xmit_cnt; |
630 | while (left != 0) { |
631 | c = info->xmit_buf[info->xmit_tail]; |
632 | info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1); |
633 | info->xmit_cnt--; |
634 | local_irq_restore(flags); |
635 | |
636 | rs_put_char(c); |
637 | |
638 | local_irq_save(flags); |
639 | left = min(info->xmit_cnt, left-1); |
640 | } |
641 | |
642 | /* Last character is being transmitted now (hopefully). */ |
643 | udelay(5); |
644 | |
645 | local_irq_restore(flags); |
646 | return; |
647 | } |
648 | |
649 | /* |
650 | * m68k_console_print is registered for printk. |
651 | */ |
652 | void console_print_68328(const char *p) |
653 | { |
654 | char c; |
655 | |
656 | while((c=*(p++)) != 0) { |
657 | if(c == '\n') |
658 | rs_put_char('\r'); |
659 | rs_put_char(c); |
660 | } |
661 | |
662 | /* Comment this if you want to have a strict interrupt-driven output */ |
663 | rs_fair_output(); |
664 | |
665 | return; |
666 | } |
667 | |
668 | static void rs_set_ldisc(struct tty_struct *tty) |
669 | { |
670 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
671 | |
672 | if (serial_paranoia_check(info, tty->name, "rs_set_ldisc")) |
673 | return; |
674 | |
675 | info->is_cons = (tty->termios->c_line == N_TTY); |
676 | |
677 | printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off"); |
678 | } |
679 | |
680 | static void rs_flush_chars(struct tty_struct *tty) |
681 | { |
682 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
683 | m68328_uart *uart = &uart_addr[info->line]; |
684 | unsigned long flags; |
685 | |
686 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) |
687 | return; |
688 | #ifndef USE_INTS |
689 | for(;;) { |
690 | #endif |
691 | |
692 | /* Enable transmitter */ |
693 | local_irq_save(flags); |
694 | |
695 | if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || |
696 | !info->xmit_buf) { |
697 | local_irq_restore(flags); |
698 | return; |
699 | } |
700 | |
701 | #ifdef USE_INTS |
702 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; |
703 | #else |
704 | uart->ustcnt |= USTCNT_TXEN; |
705 | #endif |
706 | |
707 | #ifdef USE_INTS |
708 | if (uart->utx.w & UTX_TX_AVAIL) { |
709 | #else |
710 | if (1) { |
711 | #endif |
712 | /* Send char */ |
713 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; |
714 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); |
715 | info->xmit_cnt--; |
716 | } |
717 | |
718 | #ifndef USE_INTS |
719 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); |
720 | } |
721 | #endif |
722 | local_irq_restore(flags); |
723 | } |
724 | |
725 | extern void console_printn(const char * b, int count); |
726 | |
727 | static int rs_write(struct tty_struct * tty, |
728 | const unsigned char *buf, int count) |
729 | { |
730 | int c, total = 0; |
731 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
732 | m68328_uart *uart = &uart_addr[info->line]; |
733 | unsigned long flags; |
734 | |
735 | if (serial_paranoia_check(info, tty->name, "rs_write")) |
736 | return 0; |
737 | |
738 | if (!tty || !info->xmit_buf) |
739 | return 0; |
740 | |
741 | local_save_flags(flags); |
742 | while (1) { |
743 | local_irq_disable(); |
744 | c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, |
745 | SERIAL_XMIT_SIZE - info->xmit_head)); |
746 | local_irq_restore(flags); |
747 | |
748 | if (c <= 0) |
749 | break; |
750 | |
751 | memcpy(info->xmit_buf + info->xmit_head, buf, c); |
752 | |
753 | local_irq_disable(); |
754 | info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); |
755 | info->xmit_cnt += c; |
756 | local_irq_restore(flags); |
757 | buf += c; |
758 | count -= c; |
759 | total += c; |
760 | } |
761 | |
762 | if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) { |
763 | /* Enable transmitter */ |
764 | local_irq_disable(); |
765 | #ifndef USE_INTS |
766 | while(info->xmit_cnt) { |
767 | #endif |
768 | |
769 | uart->ustcnt |= USTCNT_TXEN; |
770 | #ifdef USE_INTS |
771 | uart->ustcnt |= USTCNT_TX_INTR_MASK; |
772 | #else |
773 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); |
774 | #endif |
775 | if (uart->utx.w & UTX_TX_AVAIL) { |
776 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; |
777 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); |
778 | info->xmit_cnt--; |
779 | } |
780 | |
781 | #ifndef USE_INTS |
782 | } |
783 | #endif |
784 | local_irq_restore(flags); |
785 | } |
786 | |
787 | return total; |
788 | } |
789 | |
790 | static int rs_write_room(struct tty_struct *tty) |
791 | { |
792 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
793 | int ret; |
794 | |
795 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) |
796 | return 0; |
797 | ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; |
798 | if (ret < 0) |
799 | ret = 0; |
800 | return ret; |
801 | } |
802 | |
803 | static int rs_chars_in_buffer(struct tty_struct *tty) |
804 | { |
805 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
806 | |
807 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) |
808 | return 0; |
809 | return info->xmit_cnt; |
810 | } |
811 | |
812 | static void rs_flush_buffer(struct tty_struct *tty) |
813 | { |
814 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
815 | unsigned long flags; |
816 | |
817 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) |
818 | return; |
819 | local_irq_save(flags); |
820 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
821 | local_irq_restore(flags); |
822 | tty_wakeup(tty); |
823 | } |
824 | |
825 | /* |
826 | * ------------------------------------------------------------ |
827 | * rs_throttle() |
828 | * |
829 | * This routine is called by the upper-layer tty layer to signal that |
830 | * incoming characters should be throttled. |
831 | * ------------------------------------------------------------ |
832 | */ |
833 | static void rs_throttle(struct tty_struct * tty) |
834 | { |
835 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
836 | |
837 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) |
838 | return; |
839 | |
840 | if (I_IXOFF(tty)) |
841 | info->x_char = STOP_CHAR(tty); |
842 | |
843 | /* Turn off RTS line (do this atomic) */ |
844 | } |
845 | |
846 | static void rs_unthrottle(struct tty_struct * tty) |
847 | { |
848 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
849 | |
850 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) |
851 | return; |
852 | |
853 | if (I_IXOFF(tty)) { |
854 | if (info->x_char) |
855 | info->x_char = 0; |
856 | else |
857 | info->x_char = START_CHAR(tty); |
858 | } |
859 | |
860 | /* Assert RTS line (do this atomic) */ |
861 | } |
862 | |
863 | /* |
864 | * ------------------------------------------------------------ |
865 | * rs_ioctl() and friends |
866 | * ------------------------------------------------------------ |
867 | */ |
868 | |
869 | static int get_serial_info(struct m68k_serial * info, |
870 | struct serial_struct * retinfo) |
871 | { |
872 | struct serial_struct tmp; |
873 | |
874 | if (!retinfo) |
875 | return -EFAULT; |
876 | memset(&tmp, 0, sizeof(tmp)); |
877 | tmp.type = info->type; |
878 | tmp.line = info->line; |
879 | tmp.port = info->port; |
880 | tmp.irq = info->irq; |
881 | tmp.flags = info->flags; |
882 | tmp.baud_base = info->baud_base; |
883 | tmp.close_delay = info->close_delay; |
884 | tmp.closing_wait = info->closing_wait; |
885 | tmp.custom_divisor = info->custom_divisor; |
886 | copy_to_user(retinfo,&tmp,sizeof(*retinfo)); |
887 | return 0; |
888 | } |
889 | |
890 | static int set_serial_info(struct m68k_serial * info, |
891 | struct serial_struct * new_info) |
892 | { |
893 | struct serial_struct new_serial; |
894 | struct m68k_serial old_info; |
895 | int retval = 0; |
896 | |
897 | if (!new_info) |
898 | return -EFAULT; |
899 | copy_from_user(&new_serial,new_info,sizeof(new_serial)); |
900 | old_info = *info; |
901 | |
902 | if (!capable(CAP_SYS_ADMIN)) { |
903 | if ((new_serial.baud_base != info->baud_base) || |
904 | (new_serial.type != info->type) || |
905 | (new_serial.close_delay != info->close_delay) || |
906 | ((new_serial.flags & ~S_USR_MASK) != |
907 | (info->flags & ~S_USR_MASK))) |
908 | return -EPERM; |
909 | info->flags = ((info->flags & ~S_USR_MASK) | |
910 | (new_serial.flags & S_USR_MASK)); |
911 | info->custom_divisor = new_serial.custom_divisor; |
912 | goto check_and_exit; |
913 | } |
914 | |
915 | if (info->count > 1) |
916 | return -EBUSY; |
917 | |
918 | /* |
919 | * OK, past this point, all the error checking has been done. |
920 | * At this point, we start making changes..... |
921 | */ |
922 | |
923 | info->baud_base = new_serial.baud_base; |
924 | info->flags = ((info->flags & ~S_FLAGS) | |
925 | (new_serial.flags & S_FLAGS)); |
926 | info->type = new_serial.type; |
927 | info->close_delay = new_serial.close_delay; |
928 | info->closing_wait = new_serial.closing_wait; |
929 | |
930 | check_and_exit: |
931 | retval = startup(info); |
932 | return retval; |
933 | } |
934 | |
935 | /* |
936 | * get_lsr_info - get line status register info |
937 | * |
938 | * Purpose: Let user call ioctl() to get info when the UART physically |
939 | * is emptied. On bus types like RS485, the transmitter must |
940 | * release the bus after transmitting. This must be done when |
941 | * the transmit shift register is empty, not be done when the |
942 | * transmit holding register is empty. This functionality |
943 | * allows an RS485 driver to be written in user space. |
944 | */ |
945 | static int get_lsr_info(struct m68k_serial * info, unsigned int *value) |
946 | { |
947 | #ifdef CONFIG_SERIAL_68328_RTS_CTS |
948 | m68328_uart *uart = &uart_addr[info->line]; |
949 | #endif |
950 | unsigned char status; |
951 | unsigned long flags; |
952 | |
953 | local_irq_save(flags); |
954 | #ifdef CONFIG_SERIAL_68328_RTS_CTS |
955 | status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0; |
956 | #else |
957 | status = 0; |
958 | #endif |
959 | local_irq_restore(flags); |
960 | put_user(status,value); |
961 | return 0; |
962 | } |
963 | |
964 | /* |
965 | * This routine sends a break character out the serial port. |
966 | */ |
967 | static void send_break(struct m68k_serial * info, unsigned int duration) |
968 | { |
969 | m68328_uart *uart = &uart_addr[info->line]; |
970 | unsigned long flags; |
971 | if (!info->port) |
972 | return; |
973 | local_irq_save(flags); |
974 | #ifdef USE_INTS |
975 | uart->utx.w |= UTX_SEND_BREAK; |
976 | msleep_interruptible(duration); |
977 | uart->utx.w &= ~UTX_SEND_BREAK; |
978 | #endif |
979 | local_irq_restore(flags); |
980 | } |
981 | |
982 | static int rs_ioctl(struct tty_struct *tty, struct file * file, |
983 | unsigned int cmd, unsigned long arg) |
984 | { |
985 | int error; |
986 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; |
987 | int retval; |
988 | |
989 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) |
990 | return -ENODEV; |
991 | |
992 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && |
993 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && |
994 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { |
995 | if (tty->flags & (1 << TTY_IO_ERROR)) |
996 | return -EIO; |
997 | } |
998 | |
999 | switch (cmd) { |
1000 | case TCSBRK: /* SVID version: non-zero arg --> no break */ |
1001 | retval = tty_check_change(tty); |
1002 | if (retval) |
1003 | return retval; |
1004 | tty_wait_until_sent(tty, 0); |
1005 | if (!arg) |
1006 | send_break(info, 250); /* 1/4 second */ |
1007 | return 0; |
1008 | case TCSBRKP: /* support for POSIX tcsendbreak() */ |
1009 | retval = tty_check_change(tty); |
1010 | if (retval) |
1011 | return retval; |
1012 | tty_wait_until_sent(tty, 0); |
1013 | send_break(info, arg ? arg*(100) : 250); |
1014 | return 0; |
1015 | case TIOCGSERIAL: |
1016 | if (access_ok(VERIFY_WRITE, (void *) arg, |
1017 | sizeof(struct serial_struct))) |
1018 | return get_serial_info(info, |
1019 | (struct serial_struct *) arg); |
1020 | return -EFAULT; |
1021 | case TIOCSSERIAL: |
1022 | return set_serial_info(info, |
1023 | (struct serial_struct *) arg); |
1024 | case TIOCSERGETLSR: /* Get line status register */ |
1025 | if (access_ok(VERIFY_WRITE, (void *) arg, |
1026 | sizeof(unsigned int))) |
1027 | return get_lsr_info(info, (unsigned int *) arg); |
1028 | return -EFAULT; |
1029 | case TIOCSERGSTRUCT: |
1030 | if (!access_ok(VERIFY_WRITE, (void *) arg, |
1031 | sizeof(struct m68k_serial))) |
1032 | return -EFAULT; |
1033 | copy_to_user((struct m68k_serial *) arg, |
1034 | info, sizeof(struct m68k_serial)); |
1035 | return 0; |
1036 | |
1037 | default: |
1038 | return -ENOIOCTLCMD; |
1039 | } |
1040 | return 0; |
1041 | } |
1042 | |
1043 | static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
1044 | { |
1045 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; |
1046 | |
1047 | change_speed(info); |
1048 | |
1049 | if ((old_termios->c_cflag & CRTSCTS) && |
1050 | !(tty->termios->c_cflag & CRTSCTS)) { |
1051 | tty->hw_stopped = 0; |
1052 | rs_start(tty); |
1053 | } |
1054 | |
1055 | } |
1056 | |
1057 | /* |
1058 | * ------------------------------------------------------------ |
1059 | * rs_close() |
1060 | * |
1061 | * This routine is called when the serial port gets closed. First, we |
1062 | * wait for the last remaining data to be sent. Then, we unlink its |
1063 | * S structure from the interrupt chain if necessary, and we free |
1064 | * that IRQ if nothing is left in the chain. |
1065 | * ------------------------------------------------------------ |
1066 | */ |
1067 | static void rs_close(struct tty_struct *tty, struct file * filp) |
1068 | { |
1069 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; |
1070 | m68328_uart *uart = &uart_addr[info->line]; |
1071 | unsigned long flags; |
1072 | |
1073 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) |
1074 | return; |
1075 | |
1076 | local_irq_save(flags); |
1077 | |
1078 | if (tty_hung_up_p(filp)) { |
1079 | local_irq_restore(flags); |
1080 | return; |
1081 | } |
1082 | |
1083 | if ((tty->count == 1) && (info->count != 1)) { |
1084 | /* |
1085 | * Uh, oh. tty->count is 1, which means that the tty |
1086 | * structure will be freed. Info->count should always |
1087 | * be one in these conditions. If it's greater than |
1088 | * one, we've got real problems, since it means the |
1089 | * serial port won't be shutdown. |
1090 | */ |
1091 | printk("rs_close: bad serial port count; tty->count is 1, " |
1092 | "info->count is %d\n", info->count); |
1093 | info->count = 1; |
1094 | } |
1095 | if (--info->count < 0) { |
1096 | printk("rs_close: bad serial port count for ttyS%d: %d\n", |
1097 | info->line, info->count); |
1098 | info->count = 0; |
1099 | } |
1100 | if (info->count) { |
1101 | local_irq_restore(flags); |
1102 | return; |
1103 | } |
1104 | info->flags |= S_CLOSING; |
1105 | /* |
1106 | * Now we wait for the transmit buffer to clear; and we notify |
1107 | * the line discipline to only process XON/XOFF characters. |
1108 | */ |
1109 | tty->closing = 1; |
1110 | if (info->closing_wait != S_CLOSING_WAIT_NONE) |
1111 | tty_wait_until_sent(tty, info->closing_wait); |
1112 | /* |
1113 | * At this point we stop accepting input. To do this, we |
1114 | * disable the receive line status interrupts, and tell the |
1115 | * interrupt driver to stop checking the data ready bit in the |
1116 | * line status register. |
1117 | */ |
1118 | |
1119 | uart->ustcnt &= ~USTCNT_RXEN; |
1120 | uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK); |
1121 | |
1122 | shutdown(info); |
1123 | rs_flush_buffer(tty); |
1124 | |
1125 | tty_ldisc_flush(tty); |
1126 | tty->closing = 0; |
1127 | info->event = 0; |
1128 | info->port.tty = NULL; |
1129 | #warning "This is not and has never been valid so fix it" |
1130 | #if 0 |
1131 | if (tty->ldisc.num != ldiscs[N_TTY].num) { |
1132 | if (tty->ldisc.close) |
1133 | (tty->ldisc.close)(tty); |
1134 | tty->ldisc = ldiscs[N_TTY]; |
1135 | tty->termios->c_line = N_TTY; |
1136 | if (tty->ldisc.open) |
1137 | (tty->ldisc.open)(tty); |
1138 | } |
1139 | #endif |
1140 | if (info->blocked_open) { |
1141 | if (info->close_delay) { |
1142 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); |
1143 | } |
1144 | wake_up_interruptible(&info->open_wait); |
1145 | } |
1146 | info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING); |
1147 | wake_up_interruptible(&info->close_wait); |
1148 | local_irq_restore(flags); |
1149 | } |
1150 | |
1151 | /* |
1152 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. |
1153 | */ |
1154 | void rs_hangup(struct tty_struct *tty) |
1155 | { |
1156 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; |
1157 | |
1158 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) |
1159 | return; |
1160 | |
1161 | rs_flush_buffer(tty); |
1162 | shutdown(info); |
1163 | info->event = 0; |
1164 | info->count = 0; |
1165 | info->flags &= ~S_NORMAL_ACTIVE; |
1166 | info->port.tty = NULL; |
1167 | wake_up_interruptible(&info->open_wait); |
1168 | } |
1169 | |
1170 | /* |
1171 | * ------------------------------------------------------------ |
1172 | * rs_open() and friends |
1173 | * ------------------------------------------------------------ |
1174 | */ |
1175 | static int block_til_ready(struct tty_struct *tty, struct file * filp, |
1176 | struct m68k_serial *info) |
1177 | { |
1178 | DECLARE_WAITQUEUE(wait, current); |
1179 | int retval; |
1180 | int do_clocal = 0; |
1181 | |
1182 | /* |
1183 | * If the device is in the middle of being closed, then block |
1184 | * until it's done, and then try again. |
1185 | */ |
1186 | if (info->flags & S_CLOSING) { |
1187 | interruptible_sleep_on(&info->close_wait); |
1188 | #ifdef SERIAL_DO_RESTART |
1189 | if (info->flags & S_HUP_NOTIFY) |
1190 | return -EAGAIN; |
1191 | else |
1192 | return -ERESTARTSYS; |
1193 | #else |
1194 | return -EAGAIN; |
1195 | #endif |
1196 | } |
1197 | |
1198 | /* |
1199 | * If non-blocking mode is set, or the port is not enabled, |
1200 | * then make the check up front and then exit. |
1201 | */ |
1202 | if ((filp->f_flags & O_NONBLOCK) || |
1203 | (tty->flags & (1 << TTY_IO_ERROR))) { |
1204 | info->flags |= S_NORMAL_ACTIVE; |
1205 | return 0; |
1206 | } |
1207 | |
1208 | if (tty->termios->c_cflag & CLOCAL) |
1209 | do_clocal = 1; |
1210 | |
1211 | /* |
1212 | * Block waiting for the carrier detect and the line to become |
1213 | * free (i.e., not in use by the callout). While we are in |
1214 | * this loop, info->count is dropped by one, so that |
1215 | * rs_close() knows when to free things. We restore it upon |
1216 | * exit, either normal or abnormal. |
1217 | */ |
1218 | retval = 0; |
1219 | add_wait_queue(&info->open_wait, &wait); |
1220 | |
1221 | info->count--; |
1222 | info->blocked_open++; |
1223 | while (1) { |
1224 | local_irq_disable(); |
1225 | m68k_rtsdtr(info, 1); |
1226 | local_irq_enable(); |
1227 | current->state = TASK_INTERRUPTIBLE; |
1228 | if (tty_hung_up_p(filp) || |
1229 | !(info->flags & S_INITIALIZED)) { |
1230 | #ifdef SERIAL_DO_RESTART |
1231 | if (info->flags & S_HUP_NOTIFY) |
1232 | retval = -EAGAIN; |
1233 | else |
1234 | retval = -ERESTARTSYS; |
1235 | #else |
1236 | retval = -EAGAIN; |
1237 | #endif |
1238 | break; |
1239 | } |
1240 | if (!(info->flags & S_CLOSING) && do_clocal) |
1241 | break; |
1242 | if (signal_pending(current)) { |
1243 | retval = -ERESTARTSYS; |
1244 | break; |
1245 | } |
1246 | schedule(); |
1247 | } |
1248 | current->state = TASK_RUNNING; |
1249 | remove_wait_queue(&info->open_wait, &wait); |
1250 | if (!tty_hung_up_p(filp)) |
1251 | info->count++; |
1252 | info->blocked_open--; |
1253 | |
1254 | if (retval) |
1255 | return retval; |
1256 | info->flags |= S_NORMAL_ACTIVE; |
1257 | return 0; |
1258 | } |
1259 | |
1260 | /* |
1261 | * This routine is called whenever a serial port is opened. It |
1262 | * enables interrupts for a serial port, linking in its S structure into |
1263 | * the IRQ chain. It also performs the serial-specific |
1264 | * initialization for the tty structure. |
1265 | */ |
1266 | int rs_open(struct tty_struct *tty, struct file * filp) |
1267 | { |
1268 | struct m68k_serial *info; |
1269 | int retval, line; |
1270 | |
1271 | line = tty->index; |
1272 | |
1273 | if (line >= NR_PORTS || line < 0) /* we have exactly one */ |
1274 | return -ENODEV; |
1275 | |
1276 | info = &m68k_soft[line]; |
1277 | |
1278 | if (serial_paranoia_check(info, tty->name, "rs_open")) |
1279 | return -ENODEV; |
1280 | |
1281 | info->count++; |
1282 | tty->driver_data = info; |
1283 | info->port.tty = tty; |
1284 | |
1285 | /* |
1286 | * Start up serial port |
1287 | */ |
1288 | retval = startup(info); |
1289 | if (retval) |
1290 | return retval; |
1291 | |
1292 | return block_til_ready(tty, filp, info); |
1293 | } |
1294 | |
1295 | /* Finally, routines used to initialize the serial driver. */ |
1296 | |
1297 | static void show_serial_version(void) |
1298 | { |
1299 | printk("MC68328 serial driver version 1.00\n"); |
1300 | } |
1301 | |
1302 | static const struct tty_operations rs_ops = { |
1303 | .open = rs_open, |
1304 | .close = rs_close, |
1305 | .write = rs_write, |
1306 | .flush_chars = rs_flush_chars, |
1307 | .write_room = rs_write_room, |
1308 | .chars_in_buffer = rs_chars_in_buffer, |
1309 | .flush_buffer = rs_flush_buffer, |
1310 | .ioctl = rs_ioctl, |
1311 | .throttle = rs_throttle, |
1312 | .unthrottle = rs_unthrottle, |
1313 | .set_termios = rs_set_termios, |
1314 | .stop = rs_stop, |
1315 | .start = rs_start, |
1316 | .hangup = rs_hangup, |
1317 | .set_ldisc = rs_set_ldisc, |
1318 | }; |
1319 | |
1320 | /* rs_init inits the driver */ |
1321 | static int __init |
1322 | rs68328_init(void) |
1323 | { |
1324 | int flags, i; |
1325 | struct m68k_serial *info; |
1326 | |
1327 | serial_driver = alloc_tty_driver(NR_PORTS); |
1328 | if (!serial_driver) |
1329 | return -ENOMEM; |
1330 | |
1331 | show_serial_version(); |
1332 | |
1333 | /* Initialize the tty_driver structure */ |
1334 | /* SPARC: Not all of this is exactly right for us. */ |
1335 | |
1336 | serial_driver->name = "ttyS"; |
1337 | serial_driver->major = TTY_MAJOR; |
1338 | serial_driver->minor_start = 64; |
1339 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; |
1340 | serial_driver->subtype = SERIAL_TYPE_NORMAL; |
1341 | serial_driver->init_termios = tty_std_termios; |
1342 | serial_driver->init_termios.c_cflag = |
1343 | m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL; |
1344 | serial_driver->flags = TTY_DRIVER_REAL_RAW; |
1345 | tty_set_operations(serial_driver, &rs_ops); |
1346 | |
1347 | if (tty_register_driver(serial_driver)) { |
1348 | put_tty_driver(serial_driver); |
1349 | printk(KERN_ERR "Couldn't register serial driver\n"); |
1350 | return -ENOMEM; |
1351 | } |
1352 | |
1353 | local_irq_save(flags); |
1354 | |
1355 | for(i=0;i<NR_PORTS;i++) { |
1356 | |
1357 | info = &m68k_soft[i]; |
1358 | info->magic = SERIAL_MAGIC; |
1359 | info->port = (int) &uart_addr[i]; |
1360 | info->port.tty = NULL; |
1361 | info->irq = uart_irqs[i]; |
1362 | info->custom_divisor = 16; |
1363 | info->close_delay = 50; |
1364 | info->closing_wait = 3000; |
1365 | info->x_char = 0; |
1366 | info->event = 0; |
1367 | info->count = 0; |
1368 | info->blocked_open = 0; |
1369 | INIT_WORK(&info->tqueue, do_softint); |
1370 | INIT_WORK(&info->tqueue_hangup, do_serial_hangup); |
1371 | init_waitqueue_head(&info->open_wait); |
1372 | init_waitqueue_head(&info->close_wait); |
1373 | info->line = i; |
1374 | info->is_cons = 1; /* Means shortcuts work */ |
1375 | |
1376 | printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line, |
1377 | info->port, info->irq); |
1378 | printk(" is a builtin MC68328 UART\n"); |
1379 | |
1380 | #ifdef CONFIG_M68VZ328 |
1381 | if (i > 0 ) |
1382 | PJSEL &= 0xCF; /* PSW enable second port output */ |
1383 | #endif |
1384 | |
1385 | if (request_irq(uart_irqs[i], |
1386 | rs_interrupt, |
1387 | IRQF_DISABLED, |
1388 | "M68328_UART", info)) |
1389 | panic("Unable to attach 68328 serial interrupt\n"); |
1390 | } |
1391 | local_irq_restore(flags); |
1392 | return 0; |
1393 | } |
1394 | |
1395 | module_init(rs68328_init); |
1396 | |
1397 | |
1398 | |
1399 | static void m68328_set_baud(void) |
1400 | { |
1401 | unsigned short ustcnt; |
1402 | int i; |
1403 | |
1404 | ustcnt = USTCNT; |
1405 | USTCNT = ustcnt & ~USTCNT_TXEN; |
1406 | |
1407 | again: |
1408 | for (i = 0; i < ARRAY_SIZE(baud_table); i++) |
1409 | if (baud_table[i] == m68328_console_baud) |
1410 | break; |
1411 | if (i >= ARRAY_SIZE(baud_table)) { |
1412 | m68328_console_baud = 9600; |
1413 | goto again; |
1414 | } |
1415 | |
1416 | UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | |
1417 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); |
1418 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); |
1419 | ustcnt |= USTCNT_8_7; |
1420 | ustcnt |= USTCNT_TXEN; |
1421 | USTCNT = ustcnt; |
1422 | m68328_console_initted = 1; |
1423 | return; |
1424 | } |
1425 | |
1426 | |
1427 | int m68328_console_setup(struct console *cp, char *arg) |
1428 | { |
1429 | int i, n = CONSOLE_BAUD_RATE; |
1430 | |
1431 | if (!cp) |
1432 | return(-1); |
1433 | |
1434 | if (arg) |
1435 | n = simple_strtoul(arg,NULL,0); |
1436 | |
1437 | for (i = 0; i < ARRAY_SIZE(baud_table); i++) |
1438 | if (baud_table[i] == n) |
1439 | break; |
1440 | if (i < BAUD_TABLE_SIZE) { |
1441 | m68328_console_baud = n; |
1442 | m68328_console_cbaud = 0; |
1443 | if (i > 15) { |
1444 | m68328_console_cbaud |= CBAUDEX; |
1445 | i -= 15; |
1446 | } |
1447 | m68328_console_cbaud |= i; |
1448 | } |
1449 | |
1450 | m68328_set_baud(); /* make sure baud rate changes */ |
1451 | return(0); |
1452 | } |
1453 | |
1454 | |
1455 | static struct tty_driver *m68328_console_device(struct console *c, int *index) |
1456 | { |
1457 | *index = c->index; |
1458 | return serial_driver; |
1459 | } |
1460 | |
1461 | |
1462 | void m68328_console_write (struct console *co, const char *str, |
1463 | unsigned int count) |
1464 | { |
1465 | if (!m68328_console_initted) |
1466 | m68328_set_baud(); |
1467 | while (count--) { |
1468 | if (*str == '\n') |
1469 | rs_put_char('\r'); |
1470 | rs_put_char( *str++ ); |
1471 | } |
1472 | } |
1473 | |
1474 | |
1475 | static struct console m68328_driver = { |
1476 | .name = "ttyS", |
1477 | .write = m68328_console_write, |
1478 | .device = m68328_console_device, |
1479 | .setup = m68328_console_setup, |
1480 | .flags = CON_PRINTBUFFER, |
1481 | .index = -1, |
1482 | }; |
1483 | |
1484 | |
1485 | static int __init m68328_console_init(void) |
1486 | { |
1487 | register_console(&m68328_driver); |
1488 | return 0; |
1489 | } |
1490 | |
1491 | console_initcall(m68328_console_init); |
1492 |
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