Commit | Line | Data |
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1da177e4 LT |
1 | /* 68328serial.c: Serial port driver for 68328 microcontroller |
2 | * | |
3 | * Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu> | |
4 | * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> | |
5 | * Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org> | |
6 | * Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com> | |
7 | * Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com> | |
8 | * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com> | |
9 | * | |
10 | * VZ Support/Fixes Evan Stawnyczy <e@lineo.ca> | |
11 | * Multiple UART support Daniel Potts <danielp@cse.unsw.edu.au> | |
12 | * Power management support Daniel Potts <danielp@cse.unsw.edu.au> | |
13 | * VZ Second Serial Port enable Phil Wilshire | |
14 | * 2.4/2.5 port David McCullough | |
15 | */ | |
16 | ||
17 | #include <asm/dbg.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/signal.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/timer.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/tty.h> | |
25 | #include <linux/tty_flip.h> | |
1da177e4 LT |
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> | |
bca73e4b | 36 | #include <linux/pm_legacy.h> |
1da177e4 LT |
37 | #include <linux/bitops.h> |
38 | #include <linux/delay.h> | |
39 | ||
40 | #include <asm/io.h> | |
41 | #include <asm/irq.h> | |
42 | #include <asm/system.h> | |
1da177e4 LT |
43 | #include <asm/delay.h> |
44 | #include <asm/uaccess.h> | |
45 | ||
46 | /* (es) */ | |
47 | /* note: perhaps we can murge these files, so that you can just | |
48 | * define 1 of them, and they can sort that out for themselves | |
49 | */ | |
50 | #if defined(CONFIG_M68EZ328) | |
51 | #include <asm/MC68EZ328.h> | |
52 | #else | |
53 | #if defined(CONFIG_M68VZ328) | |
54 | #include <asm/MC68VZ328.h> | |
55 | #else | |
56 | #include <asm/MC68328.h> | |
57 | #endif /* CONFIG_M68VZ328 */ | |
58 | #endif /* CONFIG_M68EZ328 */ | |
59 | ||
60 | #include "68328serial.h" | |
61 | ||
62 | /* Turn off usage of real serial interrupt code, to "support" Copilot */ | |
63 | #ifdef CONFIG_XCOPILOT_BUGS | |
64 | #undef USE_INTS | |
65 | #else | |
66 | #define USE_INTS | |
67 | #endif | |
68 | ||
69 | static struct m68k_serial m68k_soft[NR_PORTS]; | |
70 | struct m68k_serial *IRQ_ports[NR_IRQS]; | |
71 | ||
72 | static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS; | |
73 | ||
74 | /* multiple ports are contiguous in memory */ | |
75 | m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR; | |
76 | ||
77 | struct tty_struct m68k_ttys; | |
78 | struct m68k_serial *m68k_consinfo = 0; | |
79 | ||
80 | #define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */ | |
81 | ||
82 | #ifdef CONFIG_CONSOLE | |
83 | extern wait_queue_head_t keypress_wait; | |
84 | #endif | |
85 | ||
86 | struct tty_driver *serial_driver; | |
87 | ||
88 | /* serial subtype definitions */ | |
89 | #define SERIAL_TYPE_NORMAL 1 | |
90 | ||
91 | /* number of characters left in xmit buffer before we ask for more */ | |
92 | #define WAKEUP_CHARS 256 | |
93 | ||
94 | /* Debugging... DEBUG_INTR is bad to use when one of the zs | |
95 | * lines is your console ;( | |
96 | */ | |
97 | #undef SERIAL_DEBUG_INTR | |
98 | #undef SERIAL_DEBUG_OPEN | |
99 | #undef SERIAL_DEBUG_FLOW | |
100 | ||
101 | #define RS_ISR_PASS_LIMIT 256 | |
102 | ||
1da177e4 LT |
103 | static void change_speed(struct m68k_serial *info); |
104 | ||
105 | /* | |
106 | * Setup for console. Argument comes from the boot command line. | |
107 | */ | |
108 | ||
109 | #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ) | |
110 | #define CONSOLE_BAUD_RATE 115200 | |
111 | #define DEFAULT_CBAUD B115200 | |
112 | #else | |
113 | /* (es) */ | |
114 | /* note: this is messy, but it works, again, perhaps defined somewhere else?*/ | |
115 | #ifdef CONFIG_M68VZ328 | |
116 | #define CONSOLE_BAUD_RATE 19200 | |
117 | #define DEFAULT_CBAUD B19200 | |
118 | #endif | |
119 | /* (/es) */ | |
120 | #endif | |
121 | ||
122 | #ifndef CONSOLE_BAUD_RATE | |
123 | #define CONSOLE_BAUD_RATE 9600 | |
124 | #define DEFAULT_CBAUD B9600 | |
125 | #endif | |
126 | ||
127 | ||
128 | static int m68328_console_initted = 0; | |
129 | static int m68328_console_baud = CONSOLE_BAUD_RATE; | |
130 | static int m68328_console_cbaud = DEFAULT_CBAUD; | |
131 | ||
132 | ||
1da177e4 LT |
133 | static inline int serial_paranoia_check(struct m68k_serial *info, |
134 | char *name, const char *routine) | |
135 | { | |
136 | #ifdef SERIAL_PARANOIA_CHECK | |
137 | static const char *badmagic = | |
138 | "Warning: bad magic number for serial struct %s in %s\n"; | |
139 | static const char *badinfo = | |
140 | "Warning: null m68k_serial for %s in %s\n"; | |
141 | ||
142 | if (!info) { | |
143 | printk(badinfo, name, routine); | |
144 | return 1; | |
145 | } | |
146 | if (info->magic != SERIAL_MAGIC) { | |
147 | printk(badmagic, name, routine); | |
148 | return 1; | |
149 | } | |
150 | #endif | |
151 | return 0; | |
152 | } | |
153 | ||
154 | /* | |
155 | * This is used to figure out the divisor speeds and the timeouts | |
156 | */ | |
157 | static int baud_table[] = { | |
158 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, | |
159 | 9600, 19200, 38400, 57600, 115200, 0 }; | |
160 | ||
161 | #define BAUD_TABLE_SIZE (sizeof(baud_table)/sizeof(baud_table[0])) | |
162 | ||
163 | /* Sets or clears DTR/RTS on the requested line */ | |
164 | static inline void m68k_rtsdtr(struct m68k_serial *ss, int set) | |
165 | { | |
166 | if (set) { | |
167 | /* set the RTS/CTS line */ | |
168 | } else { | |
169 | /* clear it */ | |
170 | } | |
171 | return; | |
172 | } | |
173 | ||
174 | /* Utility routines */ | |
175 | static inline int get_baud(struct m68k_serial *ss) | |
176 | { | |
177 | unsigned long result = 115200; | |
178 | unsigned short int baud = uart_addr[ss->line].ubaud; | |
179 | if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400; | |
180 | result >>= GET_FIELD(baud, UBAUD_DIVIDE); | |
181 | ||
182 | return result; | |
183 | } | |
184 | ||
185 | /* | |
186 | * ------------------------------------------------------------ | |
187 | * rs_stop() and rs_start() | |
188 | * | |
189 | * This routines are called before setting or resetting tty->stopped. | |
190 | * They enable or disable transmitter interrupts, as necessary. | |
191 | * ------------------------------------------------------------ | |
192 | */ | |
193 | static void rs_stop(struct tty_struct *tty) | |
194 | { | |
195 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
196 | m68328_uart *uart = &uart_addr[info->line]; | |
197 | unsigned long flags; | |
198 | ||
199 | if (serial_paranoia_check(info, tty->name, "rs_stop")) | |
200 | return; | |
201 | ||
727dda80 | 202 | local_irq_save(flags); |
1da177e4 | 203 | uart->ustcnt &= ~USTCNT_TXEN; |
727dda80 | 204 | local_irq_restore(flags); |
1da177e4 LT |
205 | } |
206 | ||
207 | static void rs_put_char(char ch) | |
208 | { | |
209 | int flags, loops = 0; | |
210 | ||
727dda80 | 211 | local_irq_save(flags); |
1da177e4 LT |
212 | |
213 | while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) { | |
214 | loops++; | |
215 | udelay(5); | |
216 | } | |
217 | ||
218 | UTX_TXDATA = ch; | |
219 | udelay(5); | |
727dda80 | 220 | local_irq_restore(flags); |
1da177e4 LT |
221 | } |
222 | ||
223 | static void rs_start(struct tty_struct *tty) | |
224 | { | |
225 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
226 | m68328_uart *uart = &uart_addr[info->line]; | |
227 | unsigned long flags; | |
228 | ||
229 | if (serial_paranoia_check(info, tty->name, "rs_start")) | |
230 | return; | |
231 | ||
727dda80 | 232 | local_irq_save(flags); |
1da177e4 LT |
233 | if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) { |
234 | #ifdef USE_INTS | |
235 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
236 | #else | |
237 | uart->ustcnt |= USTCNT_TXEN; | |
238 | #endif | |
239 | } | |
727dda80 | 240 | local_irq_restore(flags); |
1da177e4 LT |
241 | } |
242 | ||
243 | /* Drop into either the boot monitor or kadb upon receiving a break | |
244 | * from keyboard/console input. | |
245 | */ | |
246 | static void batten_down_hatches(void) | |
247 | { | |
248 | /* Drop into the debugger */ | |
249 | } | |
250 | ||
41c28ff1 | 251 | static void status_handle(struct m68k_serial *info, unsigned short status) |
1da177e4 LT |
252 | { |
253 | #if 0 | |
254 | if(status & DCD) { | |
255 | if((info->tty->termios->c_cflag & CRTSCTS) && | |
256 | ((info->curregs[3] & AUTO_ENAB)==0)) { | |
257 | info->curregs[3] |= AUTO_ENAB; | |
258 | info->pendregs[3] |= AUTO_ENAB; | |
259 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
260 | } | |
261 | } else { | |
262 | if((info->curregs[3] & AUTO_ENAB)) { | |
263 | info->curregs[3] &= ~AUTO_ENAB; | |
264 | info->pendregs[3] &= ~AUTO_ENAB; | |
265 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
266 | } | |
267 | } | |
268 | #endif | |
269 | /* If this is console input and this is a | |
270 | * 'break asserted' status change interrupt | |
271 | * see if we can drop into the debugger | |
272 | */ | |
273 | if((status & URX_BREAK) && info->break_abort) | |
274 | batten_down_hatches(); | |
275 | return; | |
276 | } | |
277 | ||
7d12e780 | 278 | static void receive_chars(struct m68k_serial *info, unsigned short rx) |
1da177e4 LT |
279 | { |
280 | struct tty_struct *tty = info->tty; | |
281 | m68328_uart *uart = &uart_addr[info->line]; | |
33f0f88f | 282 | unsigned char ch, flag; |
1da177e4 LT |
283 | |
284 | /* | |
285 | * This do { } while() loop will get ALL chars out of Rx FIFO | |
286 | */ | |
287 | #ifndef CONFIG_XCOPILOT_BUGS | |
288 | do { | |
289 | #endif | |
290 | ch = GET_FIELD(rx, URX_RXDATA); | |
291 | ||
292 | if(info->is_cons) { | |
293 | if(URX_BREAK & rx) { /* whee, break received */ | |
294 | status_handle(info, rx); | |
295 | return; | |
296 | #ifdef CONFIG_MAGIC_SYSRQ | |
297 | } else if (ch == 0x10) { /* ^P */ | |
298 | show_state(); | |
299 | show_free_areas(); | |
300 | show_buffers(); | |
301 | /* show_net_buffers(); */ | |
302 | return; | |
303 | } else if (ch == 0x12) { /* ^R */ | |
804ebf46 | 304 | emergency_restart(); |
1da177e4 LT |
305 | return; |
306 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
307 | } | |
308 | /* It is a 'keyboard interrupt' ;-) */ | |
309 | #ifdef CONFIG_CONSOLE | |
310 | wake_up(&keypress_wait); | |
311 | #endif | |
312 | } | |
313 | ||
314 | if(!tty) | |
315 | goto clear_and_exit; | |
316 | ||
33f0f88f AC |
317 | flag = TTY_NORMAL; |
318 | ||
1da177e4 | 319 | if(rx & URX_PARITY_ERROR) { |
33f0f88f | 320 | flag = TTY_PARITY; |
1da177e4 LT |
321 | status_handle(info, rx); |
322 | } else if(rx & URX_OVRUN) { | |
33f0f88f | 323 | flag = TTY_OVERRUN; |
1da177e4 LT |
324 | status_handle(info, rx); |
325 | } else if(rx & URX_FRAME_ERROR) { | |
33f0f88f | 326 | flag = TTY_FRAME; |
1da177e4 | 327 | status_handle(info, rx); |
1da177e4 | 328 | } |
33f0f88f | 329 | tty_insert_flip_char(tty, ch, flag); |
1da177e4 LT |
330 | #ifndef CONFIG_XCOPILOT_BUGS |
331 | } while((rx = uart->urx.w) & URX_DATA_READY); | |
332 | #endif | |
333 | ||
8e63e66b | 334 | tty_schedule_flip(tty); |
1da177e4 LT |
335 | |
336 | clear_and_exit: | |
337 | return; | |
338 | } | |
339 | ||
41c28ff1 | 340 | static void transmit_chars(struct m68k_serial *info) |
1da177e4 LT |
341 | { |
342 | m68328_uart *uart = &uart_addr[info->line]; | |
343 | ||
344 | if (info->x_char) { | |
345 | /* Send next char */ | |
346 | uart->utx.b.txdata = info->x_char; | |
347 | info->x_char = 0; | |
348 | goto clear_and_return; | |
349 | } | |
350 | ||
351 | if((info->xmit_cnt <= 0) || info->tty->stopped) { | |
352 | /* That's peculiar... TX ints off */ | |
353 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
354 | goto clear_and_return; | |
355 | } | |
356 | ||
357 | /* Send char */ | |
358 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
359 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
360 | info->xmit_cnt--; | |
361 | ||
362 | if (info->xmit_cnt < WAKEUP_CHARS) | |
363 | schedule_work(&info->tqueue); | |
364 | ||
365 | if(info->xmit_cnt <= 0) { | |
366 | /* All done for now... TX ints off */ | |
367 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
368 | goto clear_and_return; | |
369 | } | |
370 | ||
371 | clear_and_return: | |
372 | /* Clear interrupt (should be auto)*/ | |
373 | return; | |
374 | } | |
375 | ||
376 | /* | |
377 | * This is the serial driver's generic interrupt routine | |
378 | */ | |
7d12e780 | 379 | irqreturn_t rs_interrupt(int irq, void *dev_id) |
1da177e4 LT |
380 | { |
381 | struct m68k_serial * info; | |
382 | m68328_uart *uart; | |
383 | unsigned short rx; | |
384 | unsigned short tx; | |
385 | ||
386 | info = IRQ_ports[irq]; | |
387 | if(!info) | |
388 | return IRQ_NONE; | |
389 | ||
390 | uart = &uart_addr[info->line]; | |
391 | rx = uart->urx.w; | |
392 | ||
393 | #ifdef USE_INTS | |
394 | tx = uart->utx.w; | |
395 | ||
7d12e780 | 396 | if (rx & URX_DATA_READY) receive_chars(info, rx); |
1da177e4 LT |
397 | if (tx & UTX_TX_AVAIL) transmit_chars(info); |
398 | #else | |
7d12e780 | 399 | receive_chars(info, rx); |
1da177e4 LT |
400 | #endif |
401 | return IRQ_HANDLED; | |
402 | } | |
403 | ||
404 | static void do_softint(void *private) | |
405 | { | |
406 | struct m68k_serial *info = (struct m68k_serial *) private; | |
407 | struct tty_struct *tty; | |
408 | ||
409 | tty = info->tty; | |
410 | if (!tty) | |
411 | return; | |
412 | #if 0 | |
413 | if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { | |
414 | tty_wakeup(tty); | |
415 | } | |
416 | #endif | |
417 | } | |
418 | ||
419 | /* | |
420 | * This routine is called from the scheduler tqueue when the interrupt | |
421 | * routine has signalled that a hangup has occurred. The path of | |
422 | * hangup processing is: | |
423 | * | |
424 | * serial interrupt routine -> (scheduler tqueue) -> | |
425 | * do_serial_hangup() -> tty->hangup() -> rs_hangup() | |
426 | * | |
427 | */ | |
428 | static void do_serial_hangup(void *private) | |
429 | { | |
430 | struct m68k_serial *info = (struct m68k_serial *) private; | |
431 | struct tty_struct *tty; | |
432 | ||
433 | tty = info->tty; | |
434 | if (!tty) | |
435 | return; | |
436 | ||
437 | tty_hangup(tty); | |
438 | } | |
439 | ||
440 | ||
441 | static int startup(struct m68k_serial * info) | |
442 | { | |
443 | m68328_uart *uart = &uart_addr[info->line]; | |
444 | unsigned long flags; | |
445 | ||
446 | if (info->flags & S_INITIALIZED) | |
447 | return 0; | |
448 | ||
449 | if (!info->xmit_buf) { | |
450 | info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL); | |
451 | if (!info->xmit_buf) | |
452 | return -ENOMEM; | |
453 | } | |
454 | ||
727dda80 | 455 | local_irq_save(flags); |
1da177e4 LT |
456 | |
457 | /* | |
458 | * Clear the FIFO buffers and disable them | |
459 | * (they will be reenabled in change_speed()) | |
460 | */ | |
461 | ||
462 | uart->ustcnt = USTCNT_UEN; | |
463 | info->xmit_fifo_size = 1; | |
464 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN; | |
465 | (void)uart->urx.w; | |
466 | ||
467 | /* | |
468 | * Finally, enable sequencing and interrupts | |
469 | */ | |
470 | #ifdef USE_INTS | |
471 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | | |
472 | USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK; | |
473 | #else | |
474 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK; | |
475 | #endif | |
476 | ||
477 | if (info->tty) | |
478 | clear_bit(TTY_IO_ERROR, &info->tty->flags); | |
479 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; | |
480 | ||
481 | /* | |
482 | * and set the speed of the serial port | |
483 | */ | |
484 | ||
485 | change_speed(info); | |
486 | ||
487 | info->flags |= S_INITIALIZED; | |
727dda80 | 488 | local_irq_restore(flags); |
1da177e4 LT |
489 | return 0; |
490 | } | |
491 | ||
492 | /* | |
493 | * This routine will shutdown a serial port; interrupts are disabled, and | |
494 | * DTR is dropped if the hangup on close termio flag is on. | |
495 | */ | |
496 | static void shutdown(struct m68k_serial * info) | |
497 | { | |
498 | m68328_uart *uart = &uart_addr[info->line]; | |
499 | unsigned long flags; | |
500 | ||
501 | uart->ustcnt = 0; /* All off! */ | |
502 | if (!(info->flags & S_INITIALIZED)) | |
503 | return; | |
504 | ||
727dda80 | 505 | local_irq_save(flags); |
1da177e4 LT |
506 | |
507 | if (info->xmit_buf) { | |
508 | free_page((unsigned long) info->xmit_buf); | |
509 | info->xmit_buf = 0; | |
510 | } | |
511 | ||
512 | if (info->tty) | |
513 | set_bit(TTY_IO_ERROR, &info->tty->flags); | |
514 | ||
515 | info->flags &= ~S_INITIALIZED; | |
727dda80 | 516 | local_irq_restore(flags); |
1da177e4 LT |
517 | } |
518 | ||
519 | struct { | |
520 | int divisor, prescale; | |
521 | } | |
522 | #ifndef CONFIG_M68VZ328 | |
523 | hw_baud_table[18] = { | |
524 | {0,0}, /* 0 */ | |
525 | {0,0}, /* 50 */ | |
526 | {0,0}, /* 75 */ | |
527 | {0,0}, /* 110 */ | |
528 | {0,0}, /* 134 */ | |
529 | {0,0}, /* 150 */ | |
530 | {0,0}, /* 200 */ | |
531 | {7,0x26}, /* 300 */ | |
532 | {6,0x26}, /* 600 */ | |
533 | {5,0x26}, /* 1200 */ | |
534 | {0,0}, /* 1800 */ | |
535 | {4,0x26}, /* 2400 */ | |
536 | {3,0x26}, /* 4800 */ | |
537 | {2,0x26}, /* 9600 */ | |
538 | {1,0x26}, /* 19200 */ | |
539 | {0,0x26}, /* 38400 */ | |
540 | {1,0x38}, /* 57600 */ | |
541 | {0,0x38}, /* 115200 */ | |
542 | }; | |
543 | #else | |
544 | hw_baud_table[18] = { | |
545 | {0,0}, /* 0 */ | |
546 | {0,0}, /* 50 */ | |
547 | {0,0}, /* 75 */ | |
548 | {0,0}, /* 110 */ | |
549 | {0,0}, /* 134 */ | |
550 | {0,0}, /* 150 */ | |
551 | {0,0}, /* 200 */ | |
552 | {0,0}, /* 300 */ | |
553 | {7,0x26}, /* 600 */ | |
554 | {6,0x26}, /* 1200 */ | |
555 | {0,0}, /* 1800 */ | |
556 | {5,0x26}, /* 2400 */ | |
557 | {4,0x26}, /* 4800 */ | |
558 | {3,0x26}, /* 9600 */ | |
559 | {2,0x26}, /* 19200 */ | |
560 | {1,0x26}, /* 38400 */ | |
561 | {0,0x26}, /* 57600 */ | |
562 | {1,0x38}, /* 115200 */ | |
563 | }; | |
564 | #endif | |
565 | /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */ | |
566 | ||
567 | /* | |
568 | * This routine is called to set the UART divisor registers to match | |
569 | * the specified baud rate for a serial port. | |
570 | */ | |
571 | static void change_speed(struct m68k_serial *info) | |
572 | { | |
573 | m68328_uart *uart = &uart_addr[info->line]; | |
574 | unsigned short port; | |
575 | unsigned short ustcnt; | |
576 | unsigned cflag; | |
577 | int i; | |
578 | ||
579 | if (!info->tty || !info->tty->termios) | |
580 | return; | |
581 | cflag = info->tty->termios->c_cflag; | |
582 | if (!(port = info->port)) | |
583 | return; | |
584 | ||
585 | ustcnt = uart->ustcnt; | |
586 | uart->ustcnt = ustcnt & ~USTCNT_TXEN; | |
587 | ||
588 | i = cflag & CBAUD; | |
589 | if (i & CBAUDEX) { | |
590 | i = (i & ~CBAUDEX) + B38400; | |
591 | } | |
592 | ||
593 | info->baud = baud_table[i]; | |
594 | uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
595 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
596 | ||
597 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
598 | ||
599 | if ((cflag & CSIZE) == CS8) | |
600 | ustcnt |= USTCNT_8_7; | |
601 | ||
602 | if (cflag & CSTOPB) | |
603 | ustcnt |= USTCNT_STOP; | |
604 | ||
605 | if (cflag & PARENB) | |
606 | ustcnt |= USTCNT_PARITYEN; | |
607 | if (cflag & PARODD) | |
608 | ustcnt |= USTCNT_ODD_EVEN; | |
609 | ||
610 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
611 | if (cflag & CRTSCTS) { | |
612 | uart->utx.w &= ~ UTX_NOCTS; | |
613 | } else { | |
614 | uart->utx.w |= UTX_NOCTS; | |
615 | } | |
616 | #endif | |
617 | ||
618 | ustcnt |= USTCNT_TXEN; | |
619 | ||
620 | uart->ustcnt = ustcnt; | |
621 | return; | |
622 | } | |
623 | ||
624 | /* | |
625 | * Fair output driver allows a process to speak. | |
626 | */ | |
627 | static void rs_fair_output(void) | |
628 | { | |
629 | int left; /* Output no more than that */ | |
630 | unsigned long flags; | |
631 | struct m68k_serial *info = &m68k_soft[0]; | |
632 | char c; | |
633 | ||
634 | if (info == 0) return; | |
635 | if (info->xmit_buf == 0) return; | |
636 | ||
727dda80 | 637 | local_irq_save(flags); |
1da177e4 LT |
638 | left = info->xmit_cnt; |
639 | while (left != 0) { | |
640 | c = info->xmit_buf[info->xmit_tail]; | |
641 | info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1); | |
642 | info->xmit_cnt--; | |
727dda80 | 643 | local_irq_restore(flags); |
1da177e4 LT |
644 | |
645 | rs_put_char(c); | |
646 | ||
727dda80 | 647 | local_irq_save(flags); |
1da177e4 LT |
648 | left = min(info->xmit_cnt, left-1); |
649 | } | |
650 | ||
651 | /* Last character is being transmitted now (hopefully). */ | |
652 | udelay(5); | |
653 | ||
727dda80 | 654 | local_irq_restore(flags); |
1da177e4 LT |
655 | return; |
656 | } | |
657 | ||
658 | /* | |
659 | * m68k_console_print is registered for printk. | |
660 | */ | |
661 | void console_print_68328(const char *p) | |
662 | { | |
663 | char c; | |
664 | ||
665 | while((c=*(p++)) != 0) { | |
666 | if(c == '\n') | |
667 | rs_put_char('\r'); | |
668 | rs_put_char(c); | |
669 | } | |
670 | ||
671 | /* Comment this if you want to have a strict interrupt-driven output */ | |
672 | rs_fair_output(); | |
673 | ||
674 | return; | |
675 | } | |
676 | ||
677 | static void rs_set_ldisc(struct tty_struct *tty) | |
678 | { | |
679 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
680 | ||
681 | if (serial_paranoia_check(info, tty->name, "rs_set_ldisc")) | |
682 | return; | |
683 | ||
684 | info->is_cons = (tty->termios->c_line == N_TTY); | |
685 | ||
686 | printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off"); | |
687 | } | |
688 | ||
689 | static void rs_flush_chars(struct tty_struct *tty) | |
690 | { | |
691 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
692 | m68328_uart *uart = &uart_addr[info->line]; | |
693 | unsigned long flags; | |
694 | ||
695 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) | |
696 | return; | |
697 | #ifndef USE_INTS | |
698 | for(;;) { | |
699 | #endif | |
700 | ||
701 | /* Enable transmitter */ | |
727dda80 | 702 | local_irq_save(flags); |
1da177e4 LT |
703 | |
704 | if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || | |
705 | !info->xmit_buf) { | |
727dda80 | 706 | local_irq_restore(flags); |
1da177e4 LT |
707 | return; |
708 | } | |
709 | ||
710 | #ifdef USE_INTS | |
711 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
712 | #else | |
713 | uart->ustcnt |= USTCNT_TXEN; | |
714 | #endif | |
715 | ||
716 | #ifdef USE_INTS | |
717 | if (uart->utx.w & UTX_TX_AVAIL) { | |
718 | #else | |
719 | if (1) { | |
720 | #endif | |
721 | /* Send char */ | |
722 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
723 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
724 | info->xmit_cnt--; | |
725 | } | |
726 | ||
727 | #ifndef USE_INTS | |
728 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
729 | } | |
730 | #endif | |
727dda80 | 731 | local_irq_restore(flags); |
1da177e4 LT |
732 | } |
733 | ||
734 | extern void console_printn(const char * b, int count); | |
735 | ||
736 | static int rs_write(struct tty_struct * tty, | |
737 | const unsigned char *buf, int count) | |
738 | { | |
739 | int c, total = 0; | |
740 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
741 | m68328_uart *uart = &uart_addr[info->line]; | |
742 | unsigned long flags; | |
743 | ||
744 | if (serial_paranoia_check(info, tty->name, "rs_write")) | |
745 | return 0; | |
746 | ||
747 | if (!tty || !info->xmit_buf) | |
748 | return 0; | |
749 | ||
727dda80 | 750 | local_save_flags(flags); |
1da177e4 | 751 | while (1) { |
727dda80 | 752 | local_irq_disable(); |
1da177e4 LT |
753 | c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, |
754 | SERIAL_XMIT_SIZE - info->xmit_head)); | |
727dda80 GU |
755 | local_irq_restore(flags); |
756 | ||
1da177e4 LT |
757 | if (c <= 0) |
758 | break; | |
759 | ||
760 | memcpy(info->xmit_buf + info->xmit_head, buf, c); | |
727dda80 GU |
761 | |
762 | local_irq_disable(); | |
1da177e4 LT |
763 | info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); |
764 | info->xmit_cnt += c; | |
727dda80 | 765 | local_irq_restore(flags); |
1da177e4 LT |
766 | buf += c; |
767 | count -= c; | |
768 | total += c; | |
769 | } | |
770 | ||
771 | if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) { | |
772 | /* Enable transmitter */ | |
727dda80 | 773 | local_irq_disable(); |
1da177e4 LT |
774 | #ifndef USE_INTS |
775 | while(info->xmit_cnt) { | |
776 | #endif | |
777 | ||
778 | uart->ustcnt |= USTCNT_TXEN; | |
779 | #ifdef USE_INTS | |
780 | uart->ustcnt |= USTCNT_TX_INTR_MASK; | |
781 | #else | |
782 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
783 | #endif | |
784 | if (uart->utx.w & UTX_TX_AVAIL) { | |
785 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
786 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
787 | info->xmit_cnt--; | |
788 | } | |
789 | ||
790 | #ifndef USE_INTS | |
791 | } | |
792 | #endif | |
727dda80 | 793 | local_irq_restore(flags); |
1da177e4 | 794 | } |
727dda80 | 795 | |
1da177e4 LT |
796 | return total; |
797 | } | |
798 | ||
799 | static int rs_write_room(struct tty_struct *tty) | |
800 | { | |
801 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
802 | int ret; | |
803 | ||
804 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) | |
805 | return 0; | |
806 | ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; | |
807 | if (ret < 0) | |
808 | ret = 0; | |
809 | return ret; | |
810 | } | |
811 | ||
812 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
813 | { | |
814 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
815 | ||
816 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) | |
817 | return 0; | |
818 | return info->xmit_cnt; | |
819 | } | |
820 | ||
821 | static void rs_flush_buffer(struct tty_struct *tty) | |
822 | { | |
823 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
727dda80 | 824 | unsigned long flags; |
1da177e4 LT |
825 | |
826 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) | |
827 | return; | |
727dda80 | 828 | local_irq_save(flags); |
1da177e4 | 829 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
727dda80 | 830 | local_irq_restore(flags); |
1da177e4 LT |
831 | tty_wakeup(tty); |
832 | } | |
833 | ||
834 | /* | |
835 | * ------------------------------------------------------------ | |
836 | * rs_throttle() | |
837 | * | |
838 | * This routine is called by the upper-layer tty layer to signal that | |
839 | * incoming characters should be throttled. | |
840 | * ------------------------------------------------------------ | |
841 | */ | |
842 | static void rs_throttle(struct tty_struct * tty) | |
843 | { | |
844 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
845 | ||
846 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) | |
847 | return; | |
848 | ||
849 | if (I_IXOFF(tty)) | |
850 | info->x_char = STOP_CHAR(tty); | |
851 | ||
852 | /* Turn off RTS line (do this atomic) */ | |
853 | } | |
854 | ||
855 | static void rs_unthrottle(struct tty_struct * tty) | |
856 | { | |
857 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
858 | ||
859 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) | |
860 | return; | |
861 | ||
862 | if (I_IXOFF(tty)) { | |
863 | if (info->x_char) | |
864 | info->x_char = 0; | |
865 | else | |
866 | info->x_char = START_CHAR(tty); | |
867 | } | |
868 | ||
869 | /* Assert RTS line (do this atomic) */ | |
870 | } | |
871 | ||
872 | /* | |
873 | * ------------------------------------------------------------ | |
874 | * rs_ioctl() and friends | |
875 | * ------------------------------------------------------------ | |
876 | */ | |
877 | ||
878 | static int get_serial_info(struct m68k_serial * info, | |
879 | struct serial_struct * retinfo) | |
880 | { | |
881 | struct serial_struct tmp; | |
882 | ||
883 | if (!retinfo) | |
884 | return -EFAULT; | |
885 | memset(&tmp, 0, sizeof(tmp)); | |
886 | tmp.type = info->type; | |
887 | tmp.line = info->line; | |
888 | tmp.port = info->port; | |
889 | tmp.irq = info->irq; | |
890 | tmp.flags = info->flags; | |
891 | tmp.baud_base = info->baud_base; | |
892 | tmp.close_delay = info->close_delay; | |
893 | tmp.closing_wait = info->closing_wait; | |
894 | tmp.custom_divisor = info->custom_divisor; | |
895 | copy_to_user(retinfo,&tmp,sizeof(*retinfo)); | |
896 | return 0; | |
897 | } | |
898 | ||
899 | static int set_serial_info(struct m68k_serial * info, | |
900 | struct serial_struct * new_info) | |
901 | { | |
902 | struct serial_struct new_serial; | |
903 | struct m68k_serial old_info; | |
904 | int retval = 0; | |
905 | ||
906 | if (!new_info) | |
907 | return -EFAULT; | |
908 | copy_from_user(&new_serial,new_info,sizeof(new_serial)); | |
909 | old_info = *info; | |
910 | ||
911 | if (!capable(CAP_SYS_ADMIN)) { | |
912 | if ((new_serial.baud_base != info->baud_base) || | |
913 | (new_serial.type != info->type) || | |
914 | (new_serial.close_delay != info->close_delay) || | |
915 | ((new_serial.flags & ~S_USR_MASK) != | |
916 | (info->flags & ~S_USR_MASK))) | |
917 | return -EPERM; | |
918 | info->flags = ((info->flags & ~S_USR_MASK) | | |
919 | (new_serial.flags & S_USR_MASK)); | |
920 | info->custom_divisor = new_serial.custom_divisor; | |
921 | goto check_and_exit; | |
922 | } | |
923 | ||
924 | if (info->count > 1) | |
925 | return -EBUSY; | |
926 | ||
927 | /* | |
928 | * OK, past this point, all the error checking has been done. | |
929 | * At this point, we start making changes..... | |
930 | */ | |
931 | ||
932 | info->baud_base = new_serial.baud_base; | |
933 | info->flags = ((info->flags & ~S_FLAGS) | | |
934 | (new_serial.flags & S_FLAGS)); | |
935 | info->type = new_serial.type; | |
936 | info->close_delay = new_serial.close_delay; | |
937 | info->closing_wait = new_serial.closing_wait; | |
938 | ||
939 | check_and_exit: | |
940 | retval = startup(info); | |
941 | return retval; | |
942 | } | |
943 | ||
944 | /* | |
945 | * get_lsr_info - get line status register info | |
946 | * | |
947 | * Purpose: Let user call ioctl() to get info when the UART physically | |
948 | * is emptied. On bus types like RS485, the transmitter must | |
949 | * release the bus after transmitting. This must be done when | |
950 | * the transmit shift register is empty, not be done when the | |
951 | * transmit holding register is empty. This functionality | |
952 | * allows an RS485 driver to be written in user space. | |
953 | */ | |
954 | static int get_lsr_info(struct m68k_serial * info, unsigned int *value) | |
955 | { | |
956 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
957 | m68328_uart *uart = &uart_addr[info->line]; | |
958 | #endif | |
959 | unsigned char status; | |
727dda80 | 960 | unsigned long flags; |
1da177e4 | 961 | |
727dda80 | 962 | local_irq_save(flags); |
1da177e4 LT |
963 | #ifdef CONFIG_SERIAL_68328_RTS_CTS |
964 | status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0; | |
965 | #else | |
966 | status = 0; | |
967 | #endif | |
727dda80 | 968 | local_irq_restore(flags); |
1da177e4 LT |
969 | put_user(status,value); |
970 | return 0; | |
971 | } | |
972 | ||
973 | /* | |
974 | * This routine sends a break character out the serial port. | |
975 | */ | |
6a72c7ba | 976 | static void send_break(struct m68k_serial * info, unsigned int duration) |
1da177e4 LT |
977 | { |
978 | m68328_uart *uart = &uart_addr[info->line]; | |
979 | unsigned long flags; | |
980 | if (!info->port) | |
981 | return; | |
727dda80 | 982 | local_irq_save(flags); |
1da177e4 LT |
983 | #ifdef USE_INTS |
984 | uart->utx.w |= UTX_SEND_BREAK; | |
6a72c7ba | 985 | msleep_interruptible(duration); |
1da177e4 LT |
986 | uart->utx.w &= ~UTX_SEND_BREAK; |
987 | #endif | |
727dda80 | 988 | local_irq_restore(flags); |
1da177e4 LT |
989 | } |
990 | ||
991 | static int rs_ioctl(struct tty_struct *tty, struct file * file, | |
992 | unsigned int cmd, unsigned long arg) | |
993 | { | |
994 | int error; | |
995 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
996 | int retval; | |
997 | ||
998 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
999 | return -ENODEV; | |
1000 | ||
1001 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
1002 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && | |
1003 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { | |
1004 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1005 | return -EIO; | |
1006 | } | |
1007 | ||
1008 | switch (cmd) { | |
1009 | case TCSBRK: /* SVID version: non-zero arg --> no break */ | |
1010 | retval = tty_check_change(tty); | |
1011 | if (retval) | |
1012 | return retval; | |
1013 | tty_wait_until_sent(tty, 0); | |
1014 | if (!arg) | |
6a72c7ba | 1015 | send_break(info, 250); /* 1/4 second */ |
1da177e4 LT |
1016 | return 0; |
1017 | case TCSBRKP: /* support for POSIX tcsendbreak() */ | |
1018 | retval = tty_check_change(tty); | |
1019 | if (retval) | |
1020 | return retval; | |
1021 | tty_wait_until_sent(tty, 0); | |
6a72c7ba | 1022 | send_break(info, arg ? arg*(100) : 250); |
1da177e4 LT |
1023 | return 0; |
1024 | case TIOCGSOFTCAR: | |
1025 | error = put_user(C_CLOCAL(tty) ? 1 : 0, | |
1026 | (unsigned long *) arg); | |
1027 | if (error) | |
1028 | return error; | |
1029 | return 0; | |
1030 | case TIOCSSOFTCAR: | |
1031 | get_user(arg, (unsigned long *) arg); | |
1032 | tty->termios->c_cflag = | |
1033 | ((tty->termios->c_cflag & ~CLOCAL) | | |
1034 | (arg ? CLOCAL : 0)); | |
1035 | return 0; | |
1036 | case TIOCGSERIAL: | |
1037 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
1038 | sizeof(struct serial_struct))) | |
1039 | return get_serial_info(info, | |
1040 | (struct serial_struct *) arg); | |
1041 | return -EFAULT; | |
1042 | case TIOCSSERIAL: | |
1043 | return set_serial_info(info, | |
1044 | (struct serial_struct *) arg); | |
1045 | case TIOCSERGETLSR: /* Get line status register */ | |
1046 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
727dda80 | 1047 | sizeof(unsigned int))) |
1da177e4 LT |
1048 | return get_lsr_info(info, (unsigned int *) arg); |
1049 | return -EFAULT; | |
1050 | case TIOCSERGSTRUCT: | |
1051 | if (!access_ok(VERIFY_WRITE, (void *) arg, | |
1052 | sizeof(struct m68k_serial))) | |
1053 | return -EFAULT; | |
1054 | copy_to_user((struct m68k_serial *) arg, | |
1055 | info, sizeof(struct m68k_serial)); | |
1056 | return 0; | |
1057 | ||
1058 | default: | |
1059 | return -ENOIOCTLCMD; | |
1060 | } | |
1061 | return 0; | |
1062 | } | |
1063 | ||
1064 | static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios) | |
1065 | { | |
1066 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
1067 | ||
1068 | if (tty->termios->c_cflag == old_termios->c_cflag) | |
1069 | return; | |
1070 | ||
1071 | change_speed(info); | |
1072 | ||
1073 | if ((old_termios->c_cflag & CRTSCTS) && | |
1074 | !(tty->termios->c_cflag & CRTSCTS)) { | |
1075 | tty->hw_stopped = 0; | |
1076 | rs_start(tty); | |
1077 | } | |
1078 | ||
1079 | } | |
1080 | ||
1081 | /* | |
1082 | * ------------------------------------------------------------ | |
1083 | * rs_close() | |
1084 | * | |
1085 | * This routine is called when the serial port gets closed. First, we | |
1086 | * wait for the last remaining data to be sent. Then, we unlink its | |
1087 | * S structure from the interrupt chain if necessary, and we free | |
1088 | * that IRQ if nothing is left in the chain. | |
1089 | * ------------------------------------------------------------ | |
1090 | */ | |
1091 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
1092 | { | |
1093 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1094 | m68328_uart *uart = &uart_addr[info->line]; | |
1095 | unsigned long flags; | |
1096 | ||
1097 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) | |
1098 | return; | |
1099 | ||
727dda80 | 1100 | local_irq_save(flags); |
1da177e4 LT |
1101 | |
1102 | if (tty_hung_up_p(filp)) { | |
727dda80 | 1103 | local_irq_restore(flags); |
1da177e4 LT |
1104 | return; |
1105 | } | |
1106 | ||
1107 | if ((tty->count == 1) && (info->count != 1)) { | |
1108 | /* | |
1109 | * Uh, oh. tty->count is 1, which means that the tty | |
1110 | * structure will be freed. Info->count should always | |
1111 | * be one in these conditions. If it's greater than | |
1112 | * one, we've got real problems, since it means the | |
1113 | * serial port won't be shutdown. | |
1114 | */ | |
1115 | printk("rs_close: bad serial port count; tty->count is 1, " | |
1116 | "info->count is %d\n", info->count); | |
1117 | info->count = 1; | |
1118 | } | |
1119 | if (--info->count < 0) { | |
1120 | printk("rs_close: bad serial port count for ttyS%d: %d\n", | |
1121 | info->line, info->count); | |
1122 | info->count = 0; | |
1123 | } | |
1124 | if (info->count) { | |
727dda80 | 1125 | local_irq_restore(flags); |
1da177e4 LT |
1126 | return; |
1127 | } | |
1128 | info->flags |= S_CLOSING; | |
1129 | /* | |
1130 | * Now we wait for the transmit buffer to clear; and we notify | |
1131 | * the line discipline to only process XON/XOFF characters. | |
1132 | */ | |
1133 | tty->closing = 1; | |
1134 | if (info->closing_wait != S_CLOSING_WAIT_NONE) | |
1135 | tty_wait_until_sent(tty, info->closing_wait); | |
1136 | /* | |
1137 | * At this point we stop accepting input. To do this, we | |
1138 | * disable the receive line status interrupts, and tell the | |
1139 | * interrupt driver to stop checking the data ready bit in the | |
1140 | * line status register. | |
1141 | */ | |
1142 | ||
1143 | uart->ustcnt &= ~USTCNT_RXEN; | |
1144 | uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK); | |
1145 | ||
1146 | shutdown(info); | |
1147 | if (tty->driver->flush_buffer) | |
1148 | tty->driver->flush_buffer(tty); | |
1149 | ||
1150 | tty_ldisc_flush(tty); | |
1151 | tty->closing = 0; | |
1152 | info->event = 0; | |
1153 | info->tty = 0; | |
1154 | #warning "This is not and has never been valid so fix it" | |
1155 | #if 0 | |
1156 | if (tty->ldisc.num != ldiscs[N_TTY].num) { | |
1157 | if (tty->ldisc.close) | |
1158 | (tty->ldisc.close)(tty); | |
1159 | tty->ldisc = ldiscs[N_TTY]; | |
1160 | tty->termios->c_line = N_TTY; | |
1161 | if (tty->ldisc.open) | |
1162 | (tty->ldisc.open)(tty); | |
1163 | } | |
1164 | #endif | |
1165 | if (info->blocked_open) { | |
1166 | if (info->close_delay) { | |
1167 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); | |
1168 | } | |
1169 | wake_up_interruptible(&info->open_wait); | |
1170 | } | |
1171 | info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING); | |
1172 | wake_up_interruptible(&info->close_wait); | |
727dda80 | 1173 | local_irq_restore(flags); |
1da177e4 LT |
1174 | } |
1175 | ||
1176 | /* | |
1177 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
1178 | */ | |
1179 | void rs_hangup(struct tty_struct *tty) | |
1180 | { | |
1181 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1182 | ||
1183 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) | |
1184 | return; | |
1185 | ||
1186 | rs_flush_buffer(tty); | |
1187 | shutdown(info); | |
1188 | info->event = 0; | |
1189 | info->count = 0; | |
1190 | info->flags &= ~S_NORMAL_ACTIVE; | |
1191 | info->tty = 0; | |
1192 | wake_up_interruptible(&info->open_wait); | |
1193 | } | |
1194 | ||
1195 | /* | |
1196 | * ------------------------------------------------------------ | |
1197 | * rs_open() and friends | |
1198 | * ------------------------------------------------------------ | |
1199 | */ | |
1200 | static int block_til_ready(struct tty_struct *tty, struct file * filp, | |
1201 | struct m68k_serial *info) | |
1202 | { | |
1203 | DECLARE_WAITQUEUE(wait, current); | |
1204 | int retval; | |
1205 | int do_clocal = 0; | |
1206 | ||
1207 | /* | |
1208 | * If the device is in the middle of being closed, then block | |
1209 | * until it's done, and then try again. | |
1210 | */ | |
1211 | if (info->flags & S_CLOSING) { | |
1212 | interruptible_sleep_on(&info->close_wait); | |
1213 | #ifdef SERIAL_DO_RESTART | |
1214 | if (info->flags & S_HUP_NOTIFY) | |
1215 | return -EAGAIN; | |
1216 | else | |
1217 | return -ERESTARTSYS; | |
1218 | #else | |
1219 | return -EAGAIN; | |
1220 | #endif | |
1221 | } | |
1222 | ||
1223 | /* | |
1224 | * If non-blocking mode is set, or the port is not enabled, | |
1225 | * then make the check up front and then exit. | |
1226 | */ | |
1227 | if ((filp->f_flags & O_NONBLOCK) || | |
1228 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
1229 | info->flags |= S_NORMAL_ACTIVE; | |
1230 | return 0; | |
1231 | } | |
1232 | ||
1233 | if (tty->termios->c_cflag & CLOCAL) | |
1234 | do_clocal = 1; | |
1235 | ||
1236 | /* | |
1237 | * Block waiting for the carrier detect and the line to become | |
1238 | * free (i.e., not in use by the callout). While we are in | |
1239 | * this loop, info->count is dropped by one, so that | |
1240 | * rs_close() knows when to free things. We restore it upon | |
1241 | * exit, either normal or abnormal. | |
1242 | */ | |
1243 | retval = 0; | |
1244 | add_wait_queue(&info->open_wait, &wait); | |
1245 | ||
1246 | info->count--; | |
1247 | info->blocked_open++; | |
1248 | while (1) { | |
727dda80 | 1249 | local_irq_disable(); |
1da177e4 | 1250 | m68k_rtsdtr(info, 1); |
727dda80 | 1251 | local_irq_enable(); |
1da177e4 LT |
1252 | current->state = TASK_INTERRUPTIBLE; |
1253 | if (tty_hung_up_p(filp) || | |
1254 | !(info->flags & S_INITIALIZED)) { | |
1255 | #ifdef SERIAL_DO_RESTART | |
1256 | if (info->flags & S_HUP_NOTIFY) | |
1257 | retval = -EAGAIN; | |
1258 | else | |
1259 | retval = -ERESTARTSYS; | |
1260 | #else | |
1261 | retval = -EAGAIN; | |
1262 | #endif | |
1263 | break; | |
1264 | } | |
1265 | if (!(info->flags & S_CLOSING) && do_clocal) | |
1266 | break; | |
1267 | if (signal_pending(current)) { | |
1268 | retval = -ERESTARTSYS; | |
1269 | break; | |
1270 | } | |
1271 | schedule(); | |
1272 | } | |
1273 | current->state = TASK_RUNNING; | |
1274 | remove_wait_queue(&info->open_wait, &wait); | |
1275 | if (!tty_hung_up_p(filp)) | |
1276 | info->count++; | |
1277 | info->blocked_open--; | |
1278 | ||
1279 | if (retval) | |
1280 | return retval; | |
1281 | info->flags |= S_NORMAL_ACTIVE; | |
1282 | return 0; | |
1283 | } | |
1284 | ||
1285 | /* | |
1286 | * This routine is called whenever a serial port is opened. It | |
1287 | * enables interrupts for a serial port, linking in its S structure into | |
1288 | * the IRQ chain. It also performs the serial-specific | |
1289 | * initialization for the tty structure. | |
1290 | */ | |
1291 | int rs_open(struct tty_struct *tty, struct file * filp) | |
1292 | { | |
1293 | struct m68k_serial *info; | |
1294 | int retval, line; | |
1295 | ||
1296 | line = tty->index; | |
1297 | ||
1298 | if (line >= NR_PORTS || line < 0) /* we have exactly one */ | |
1299 | return -ENODEV; | |
1300 | ||
1301 | info = &m68k_soft[line]; | |
1302 | ||
1303 | if (serial_paranoia_check(info, tty->name, "rs_open")) | |
1304 | return -ENODEV; | |
1305 | ||
1306 | info->count++; | |
1307 | tty->driver_data = info; | |
1308 | info->tty = tty; | |
1309 | ||
1310 | /* | |
1311 | * Start up serial port | |
1312 | */ | |
1313 | retval = startup(info); | |
1314 | if (retval) | |
1315 | return retval; | |
1316 | ||
1317 | return block_til_ready(tty, filp, info); | |
1318 | } | |
1319 | ||
1320 | /* Finally, routines used to initialize the serial driver. */ | |
1321 | ||
1322 | static void show_serial_version(void) | |
1323 | { | |
1324 | printk("MC68328 serial driver version 1.00\n"); | |
1325 | } | |
1326 | ||
bca73e4b | 1327 | #ifdef CONFIG_PM_LEGACY |
1da177e4 LT |
1328 | /* Serial Power management |
1329 | * The console (currently fixed at line 0) is a special case for power | |
1330 | * management because the kernel is so chatty. The console will be | |
1331 | * explicitly disabled my our power manager as the last minute, so we won't | |
1332 | * mess with it here. | |
1333 | */ | |
1334 | static struct pm_dev *serial_pm[NR_PORTS]; | |
1335 | ||
1336 | static int serial_pm_callback(struct pm_dev *dev, pm_request_t request, void *data) | |
1337 | { | |
1338 | struct m68k_serial *info = (struct m68k_serial *)dev->data; | |
1339 | ||
1340 | if(info == NULL) | |
1341 | return -1; | |
1342 | ||
1343 | /* special case for line 0 - pm restores it */ | |
1344 | if(info->line == 0) | |
1345 | return 0; | |
1346 | ||
1347 | switch (request) { | |
1348 | case PM_SUSPEND: | |
1349 | shutdown(info); | |
1350 | break; | |
1351 | ||
1352 | case PM_RESUME: | |
1353 | startup(info); | |
1354 | break; | |
1355 | } | |
1356 | return 0; | |
1357 | } | |
1358 | ||
1359 | void shutdown_console(void) | |
1360 | { | |
1361 | struct m68k_serial *info = &m68k_soft[0]; | |
1362 | ||
1363 | /* HACK: wait a bit for any pending printk's to be dumped */ | |
1364 | { | |
1365 | int i = 10000; | |
1366 | while(i--); | |
1367 | } | |
1368 | ||
1369 | shutdown(info); | |
1370 | } | |
1371 | ||
1372 | void startup_console(void) | |
1373 | { | |
1374 | struct m68k_serial *info = &m68k_soft[0]; | |
1375 | startup(info); | |
1376 | } | |
bca73e4b | 1377 | #endif /* CONFIG_PM_LEGACY */ |
1da177e4 LT |
1378 | |
1379 | ||
b68e31d0 | 1380 | static const struct tty_operations rs_ops = { |
1da177e4 LT |
1381 | .open = rs_open, |
1382 | .close = rs_close, | |
1383 | .write = rs_write, | |
1384 | .flush_chars = rs_flush_chars, | |
1385 | .write_room = rs_write_room, | |
1386 | .chars_in_buffer = rs_chars_in_buffer, | |
1387 | .flush_buffer = rs_flush_buffer, | |
1388 | .ioctl = rs_ioctl, | |
1389 | .throttle = rs_throttle, | |
1390 | .unthrottle = rs_unthrottle, | |
1391 | .set_termios = rs_set_termios, | |
1392 | .stop = rs_stop, | |
1393 | .start = rs_start, | |
1394 | .hangup = rs_hangup, | |
1395 | .set_ldisc = rs_set_ldisc, | |
1396 | }; | |
1397 | ||
1398 | /* rs_init inits the driver */ | |
1399 | static int __init | |
1400 | rs68328_init(void) | |
1401 | { | |
1402 | int flags, i; | |
1403 | struct m68k_serial *info; | |
1404 | ||
1405 | serial_driver = alloc_tty_driver(NR_PORTS); | |
1406 | if (!serial_driver) | |
1407 | return -ENOMEM; | |
1408 | ||
1409 | show_serial_version(); | |
1410 | ||
1411 | /* Initialize the tty_driver structure */ | |
1412 | /* SPARC: Not all of this is exactly right for us. */ | |
1413 | ||
1414 | serial_driver->name = "ttyS"; | |
1415 | serial_driver->major = TTY_MAJOR; | |
1416 | serial_driver->minor_start = 64; | |
1417 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
1418 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
1419 | serial_driver->init_termios = tty_std_termios; | |
1420 | serial_driver->init_termios.c_cflag = | |
1421 | m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL; | |
1422 | serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
1423 | tty_set_operations(serial_driver, &rs_ops); | |
1424 | ||
1425 | if (tty_register_driver(serial_driver)) { | |
1426 | put_tty_driver(serial_driver); | |
1427 | printk(KERN_ERR "Couldn't register serial driver\n"); | |
1428 | return -ENOMEM; | |
1429 | } | |
1430 | ||
727dda80 | 1431 | local_irq_save(flags); |
1da177e4 LT |
1432 | |
1433 | for(i=0;i<NR_PORTS;i++) { | |
1434 | ||
1435 | info = &m68k_soft[i]; | |
1436 | info->magic = SERIAL_MAGIC; | |
1437 | info->port = (int) &uart_addr[i]; | |
1438 | info->tty = 0; | |
1439 | info->irq = uart_irqs[i]; | |
1440 | info->custom_divisor = 16; | |
1441 | info->close_delay = 50; | |
1442 | info->closing_wait = 3000; | |
1443 | info->x_char = 0; | |
1444 | info->event = 0; | |
1445 | info->count = 0; | |
1446 | info->blocked_open = 0; | |
1447 | INIT_WORK(&info->tqueue, do_softint, info); | |
1448 | INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info); | |
1449 | init_waitqueue_head(&info->open_wait); | |
1450 | init_waitqueue_head(&info->close_wait); | |
1451 | info->line = i; | |
1452 | info->is_cons = 1; /* Means shortcuts work */ | |
1453 | ||
1454 | printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line, | |
1455 | info->port, info->irq); | |
1456 | printk(" is a builtin MC68328 UART\n"); | |
1457 | ||
1458 | IRQ_ports[info->irq] = info; /* waste of space */ | |
1459 | ||
1460 | #ifdef CONFIG_M68VZ328 | |
1461 | if (i > 0 ) | |
1462 | PJSEL &= 0xCF; /* PSW enable second port output */ | |
1463 | #endif | |
1464 | ||
1465 | if (request_irq(uart_irqs[i], | |
1466 | rs_interrupt, | |
1467 | IRQ_FLG_STD, | |
1468 | "M68328_UART", NULL)) | |
1469 | panic("Unable to attach 68328 serial interrupt\n"); | |
bca73e4b | 1470 | #ifdef CONFIG_PM_LEGACY |
1da177e4 LT |
1471 | serial_pm[i] = pm_register(PM_SYS_DEV, PM_SYS_COM, serial_pm_callback); |
1472 | if (serial_pm[i]) | |
1473 | serial_pm[i]->data = info; | |
1474 | #endif | |
1475 | } | |
727dda80 | 1476 | local_irq_restore(flags); |
1da177e4 LT |
1477 | return 0; |
1478 | } | |
1479 | ||
1da177e4 LT |
1480 | module_init(rs68328_init); |
1481 | ||
1482 | ||
1483 | ||
1484 | static void m68328_set_baud(void) | |
1485 | { | |
1486 | unsigned short ustcnt; | |
1487 | int i; | |
1488 | ||
1489 | ustcnt = USTCNT; | |
1490 | USTCNT = ustcnt & ~USTCNT_TXEN; | |
1491 | ||
1492 | again: | |
1493 | for (i = 0; i < sizeof(baud_table) / sizeof(baud_table[0]); i++) | |
1494 | if (baud_table[i] == m68328_console_baud) | |
1495 | break; | |
1496 | if (i >= sizeof(baud_table) / sizeof(baud_table[0])) { | |
1497 | m68328_console_baud = 9600; | |
1498 | goto again; | |
1499 | } | |
1500 | ||
1501 | UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
1502 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
1503 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
1504 | ustcnt |= USTCNT_8_7; | |
1505 | ustcnt |= USTCNT_TXEN; | |
1506 | USTCNT = ustcnt; | |
1507 | m68328_console_initted = 1; | |
1508 | return; | |
1509 | } | |
1510 | ||
1511 | ||
1512 | int m68328_console_setup(struct console *cp, char *arg) | |
1513 | { | |
1514 | int i, n = CONSOLE_BAUD_RATE; | |
1515 | ||
1516 | if (!cp) | |
1517 | return(-1); | |
1518 | ||
1519 | if (arg) | |
1520 | n = simple_strtoul(arg,NULL,0); | |
1521 | ||
1522 | for (i = 0; i < BAUD_TABLE_SIZE; i++) | |
1523 | if (baud_table[i] == n) | |
1524 | break; | |
1525 | if (i < BAUD_TABLE_SIZE) { | |
1526 | m68328_console_baud = n; | |
1527 | m68328_console_cbaud = 0; | |
1528 | if (i > 15) { | |
1529 | m68328_console_cbaud |= CBAUDEX; | |
1530 | i -= 15; | |
1531 | } | |
1532 | m68328_console_cbaud |= i; | |
1533 | } | |
1534 | ||
1535 | m68328_set_baud(); /* make sure baud rate changes */ | |
1536 | return(0); | |
1537 | } | |
1538 | ||
1539 | ||
1540 | static struct tty_driver *m68328_console_device(struct console *c, int *index) | |
1541 | { | |
1542 | *index = c->index; | |
1543 | return serial_driver; | |
1544 | } | |
1545 | ||
1546 | ||
1547 | void m68328_console_write (struct console *co, const char *str, | |
1548 | unsigned int count) | |
1549 | { | |
1550 | if (!m68328_console_initted) | |
1551 | m68328_set_baud(); | |
1552 | while (count--) { | |
1553 | if (*str == '\n') | |
1554 | rs_put_char('\r'); | |
1555 | rs_put_char( *str++ ); | |
1556 | } | |
1557 | } | |
1558 | ||
1559 | ||
1560 | static struct console m68328_driver = { | |
1561 | .name = "ttyS", | |
1562 | .write = m68328_console_write, | |
1563 | .device = m68328_console_device, | |
1564 | .setup = m68328_console_setup, | |
1565 | .flags = CON_PRINTBUFFER, | |
1566 | .index = -1, | |
1567 | }; | |
1568 | ||
1569 | ||
1570 | static int __init m68328_console_init(void) | |
1571 | { | |
1572 | register_console(&m68328_driver); | |
1573 | return 0; | |
1574 | } | |
1575 | ||
1576 | console_initcall(m68328_console_init); |