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> | |
36 | #include <linux/bitops.h> | |
37 | #include <linux/delay.h> | |
38 | ||
39 | #include <asm/io.h> | |
40 | #include <asm/irq.h> | |
41 | #include <asm/system.h> | |
1da177e4 LT |
42 | #include <asm/delay.h> |
43 | #include <asm/uaccess.h> | |
44 | ||
45 | /* (es) */ | |
46 | /* note: perhaps we can murge these files, so that you can just | |
47 | * define 1 of them, and they can sort that out for themselves | |
48 | */ | |
49 | #if defined(CONFIG_M68EZ328) | |
50 | #include <asm/MC68EZ328.h> | |
51 | #else | |
52 | #if defined(CONFIG_M68VZ328) | |
53 | #include <asm/MC68VZ328.h> | |
54 | #else | |
55 | #include <asm/MC68328.h> | |
56 | #endif /* CONFIG_M68VZ328 */ | |
57 | #endif /* CONFIG_M68EZ328 */ | |
58 | ||
59 | #include "68328serial.h" | |
60 | ||
61 | /* Turn off usage of real serial interrupt code, to "support" Copilot */ | |
62 | #ifdef CONFIG_XCOPILOT_BUGS | |
63 | #undef USE_INTS | |
64 | #else | |
65 | #define USE_INTS | |
66 | #endif | |
67 | ||
68 | static struct m68k_serial m68k_soft[NR_PORTS]; | |
69 | struct m68k_serial *IRQ_ports[NR_IRQS]; | |
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 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | #define BAUD_TABLE_SIZE (sizeof(baud_table)/sizeof(baud_table[0])) | |
158 | ||
159 | /* Sets or clears DTR/RTS on the requested line */ | |
160 | static inline void m68k_rtsdtr(struct m68k_serial *ss, int set) | |
161 | { | |
162 | if (set) { | |
163 | /* set the RTS/CTS line */ | |
164 | } else { | |
165 | /* clear it */ | |
166 | } | |
167 | return; | |
168 | } | |
169 | ||
170 | /* Utility routines */ | |
171 | static inline int get_baud(struct m68k_serial *ss) | |
172 | { | |
173 | unsigned long result = 115200; | |
174 | unsigned short int baud = uart_addr[ss->line].ubaud; | |
175 | if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400; | |
176 | result >>= GET_FIELD(baud, UBAUD_DIVIDE); | |
177 | ||
178 | return result; | |
179 | } | |
180 | ||
181 | /* | |
182 | * ------------------------------------------------------------ | |
183 | * rs_stop() and rs_start() | |
184 | * | |
185 | * This routines are called before setting or resetting tty->stopped. | |
186 | * They enable or disable transmitter interrupts, as necessary. | |
187 | * ------------------------------------------------------------ | |
188 | */ | |
189 | static void rs_stop(struct tty_struct *tty) | |
190 | { | |
191 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
192 | m68328_uart *uart = &uart_addr[info->line]; | |
193 | unsigned long flags; | |
194 | ||
195 | if (serial_paranoia_check(info, tty->name, "rs_stop")) | |
196 | return; | |
197 | ||
727dda80 | 198 | local_irq_save(flags); |
1da177e4 | 199 | uart->ustcnt &= ~USTCNT_TXEN; |
727dda80 | 200 | local_irq_restore(flags); |
1da177e4 LT |
201 | } |
202 | ||
09a6ffa8 | 203 | static int rs_put_char(char ch) |
1da177e4 LT |
204 | { |
205 | int flags, loops = 0; | |
206 | ||
727dda80 | 207 | local_irq_save(flags); |
1da177e4 LT |
208 | |
209 | while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) { | |
210 | loops++; | |
211 | udelay(5); | |
212 | } | |
213 | ||
214 | UTX_TXDATA = ch; | |
215 | udelay(5); | |
727dda80 | 216 | local_irq_restore(flags); |
09a6ffa8 | 217 | return 1; |
1da177e4 LT |
218 | } |
219 | ||
220 | static void rs_start(struct tty_struct *tty) | |
221 | { | |
222 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
223 | m68328_uart *uart = &uart_addr[info->line]; | |
224 | unsigned long flags; | |
225 | ||
226 | if (serial_paranoia_check(info, tty->name, "rs_start")) | |
227 | return; | |
228 | ||
727dda80 | 229 | local_irq_save(flags); |
1da177e4 LT |
230 | if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) { |
231 | #ifdef USE_INTS | |
232 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
233 | #else | |
234 | uart->ustcnt |= USTCNT_TXEN; | |
235 | #endif | |
236 | } | |
727dda80 | 237 | local_irq_restore(flags); |
1da177e4 LT |
238 | } |
239 | ||
240 | /* Drop into either the boot monitor or kadb upon receiving a break | |
241 | * from keyboard/console input. | |
242 | */ | |
243 | static void batten_down_hatches(void) | |
244 | { | |
245 | /* Drop into the debugger */ | |
246 | } | |
247 | ||
41c28ff1 | 248 | static void status_handle(struct m68k_serial *info, unsigned short status) |
1da177e4 LT |
249 | { |
250 | #if 0 | |
251 | if(status & DCD) { | |
252 | if((info->tty->termios->c_cflag & CRTSCTS) && | |
253 | ((info->curregs[3] & AUTO_ENAB)==0)) { | |
254 | info->curregs[3] |= AUTO_ENAB; | |
255 | info->pendregs[3] |= AUTO_ENAB; | |
256 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
257 | } | |
258 | } else { | |
259 | if((info->curregs[3] & AUTO_ENAB)) { | |
260 | info->curregs[3] &= ~AUTO_ENAB; | |
261 | info->pendregs[3] &= ~AUTO_ENAB; | |
262 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
263 | } | |
264 | } | |
265 | #endif | |
266 | /* If this is console input and this is a | |
267 | * 'break asserted' status change interrupt | |
268 | * see if we can drop into the debugger | |
269 | */ | |
270 | if((status & URX_BREAK) && info->break_abort) | |
271 | batten_down_hatches(); | |
272 | return; | |
273 | } | |
274 | ||
7d12e780 | 275 | static void receive_chars(struct m68k_serial *info, unsigned short rx) |
1da177e4 LT |
276 | { |
277 | struct tty_struct *tty = info->tty; | |
278 | m68328_uart *uart = &uart_addr[info->line]; | |
33f0f88f | 279 | unsigned char ch, flag; |
1da177e4 LT |
280 | |
281 | /* | |
282 | * This do { } while() loop will get ALL chars out of Rx FIFO | |
283 | */ | |
284 | #ifndef CONFIG_XCOPILOT_BUGS | |
285 | do { | |
286 | #endif | |
287 | ch = GET_FIELD(rx, URX_RXDATA); | |
288 | ||
289 | if(info->is_cons) { | |
290 | if(URX_BREAK & rx) { /* whee, break received */ | |
291 | status_handle(info, rx); | |
292 | return; | |
293 | #ifdef CONFIG_MAGIC_SYSRQ | |
294 | } else if (ch == 0x10) { /* ^P */ | |
295 | show_state(); | |
296 | show_free_areas(); | |
297 | show_buffers(); | |
298 | /* show_net_buffers(); */ | |
299 | return; | |
300 | } else if (ch == 0x12) { /* ^R */ | |
804ebf46 | 301 | emergency_restart(); |
1da177e4 LT |
302 | return; |
303 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
304 | } | |
305 | /* It is a 'keyboard interrupt' ;-) */ | |
306 | #ifdef CONFIG_CONSOLE | |
307 | wake_up(&keypress_wait); | |
308 | #endif | |
309 | } | |
310 | ||
311 | if(!tty) | |
312 | goto clear_and_exit; | |
313 | ||
33f0f88f AC |
314 | flag = TTY_NORMAL; |
315 | ||
1da177e4 | 316 | if(rx & URX_PARITY_ERROR) { |
33f0f88f | 317 | flag = TTY_PARITY; |
1da177e4 LT |
318 | status_handle(info, rx); |
319 | } else if(rx & URX_OVRUN) { | |
33f0f88f | 320 | flag = TTY_OVERRUN; |
1da177e4 LT |
321 | status_handle(info, rx); |
322 | } else if(rx & URX_FRAME_ERROR) { | |
33f0f88f | 323 | flag = TTY_FRAME; |
1da177e4 | 324 | status_handle(info, rx); |
1da177e4 | 325 | } |
33f0f88f | 326 | tty_insert_flip_char(tty, ch, flag); |
1da177e4 LT |
327 | #ifndef CONFIG_XCOPILOT_BUGS |
328 | } while((rx = uart->urx.w) & URX_DATA_READY); | |
329 | #endif | |
330 | ||
8e63e66b | 331 | tty_schedule_flip(tty); |
1da177e4 LT |
332 | |
333 | clear_and_exit: | |
334 | return; | |
335 | } | |
336 | ||
41c28ff1 | 337 | static void transmit_chars(struct m68k_serial *info) |
1da177e4 LT |
338 | { |
339 | m68328_uart *uart = &uart_addr[info->line]; | |
340 | ||
341 | if (info->x_char) { | |
342 | /* Send next char */ | |
343 | uart->utx.b.txdata = info->x_char; | |
344 | info->x_char = 0; | |
345 | goto clear_and_return; | |
346 | } | |
347 | ||
348 | if((info->xmit_cnt <= 0) || info->tty->stopped) { | |
349 | /* That's peculiar... TX ints off */ | |
350 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
351 | goto clear_and_return; | |
352 | } | |
353 | ||
354 | /* Send char */ | |
355 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
356 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
357 | info->xmit_cnt--; | |
358 | ||
359 | if (info->xmit_cnt < WAKEUP_CHARS) | |
360 | schedule_work(&info->tqueue); | |
361 | ||
362 | if(info->xmit_cnt <= 0) { | |
363 | /* All done for now... TX ints off */ | |
364 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
365 | goto clear_and_return; | |
366 | } | |
367 | ||
368 | clear_and_return: | |
369 | /* Clear interrupt (should be auto)*/ | |
370 | return; | |
371 | } | |
372 | ||
373 | /* | |
374 | * This is the serial driver's generic interrupt routine | |
375 | */ | |
7d12e780 | 376 | irqreturn_t rs_interrupt(int irq, void *dev_id) |
1da177e4 LT |
377 | { |
378 | struct m68k_serial * info; | |
379 | m68328_uart *uart; | |
380 | unsigned short rx; | |
381 | unsigned short tx; | |
382 | ||
383 | info = IRQ_ports[irq]; | |
384 | if(!info) | |
385 | return IRQ_NONE; | |
386 | ||
387 | uart = &uart_addr[info->line]; | |
388 | rx = uart->urx.w; | |
389 | ||
390 | #ifdef USE_INTS | |
391 | tx = uart->utx.w; | |
392 | ||
7d12e780 | 393 | if (rx & URX_DATA_READY) receive_chars(info, rx); |
1da177e4 LT |
394 | if (tx & UTX_TX_AVAIL) transmit_chars(info); |
395 | #else | |
7d12e780 | 396 | receive_chars(info, rx); |
1da177e4 LT |
397 | #endif |
398 | return IRQ_HANDLED; | |
399 | } | |
400 | ||
931f9cde | 401 | static void do_softint(struct work_struct *work) |
1da177e4 | 402 | { |
931f9cde | 403 | struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue); |
1da177e4 LT |
404 | struct tty_struct *tty; |
405 | ||
406 | tty = info->tty; | |
407 | if (!tty) | |
408 | return; | |
409 | #if 0 | |
410 | if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { | |
411 | tty_wakeup(tty); | |
412 | } | |
413 | #endif | |
414 | } | |
415 | ||
416 | /* | |
417 | * This routine is called from the scheduler tqueue when the interrupt | |
418 | * routine has signalled that a hangup has occurred. The path of | |
419 | * hangup processing is: | |
420 | * | |
421 | * serial interrupt routine -> (scheduler tqueue) -> | |
422 | * do_serial_hangup() -> tty->hangup() -> rs_hangup() | |
423 | * | |
424 | */ | |
931f9cde | 425 | static void do_serial_hangup(struct work_struct *work) |
1da177e4 | 426 | { |
931f9cde | 427 | struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue_hangup); |
1da177e4 LT |
428 | struct tty_struct *tty; |
429 | ||
430 | tty = info->tty; | |
431 | if (!tty) | |
432 | return; | |
433 | ||
434 | tty_hangup(tty); | |
435 | } | |
436 | ||
437 | ||
438 | static int startup(struct m68k_serial * info) | |
439 | { | |
440 | m68328_uart *uart = &uart_addr[info->line]; | |
441 | unsigned long flags; | |
442 | ||
443 | if (info->flags & S_INITIALIZED) | |
444 | return 0; | |
445 | ||
446 | if (!info->xmit_buf) { | |
447 | info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL); | |
448 | if (!info->xmit_buf) | |
449 | return -ENOMEM; | |
450 | } | |
451 | ||
727dda80 | 452 | local_irq_save(flags); |
1da177e4 LT |
453 | |
454 | /* | |
455 | * Clear the FIFO buffers and disable them | |
456 | * (they will be reenabled in change_speed()) | |
457 | */ | |
458 | ||
459 | uart->ustcnt = USTCNT_UEN; | |
460 | info->xmit_fifo_size = 1; | |
461 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN; | |
462 | (void)uart->urx.w; | |
463 | ||
464 | /* | |
465 | * Finally, enable sequencing and interrupts | |
466 | */ | |
467 | #ifdef USE_INTS | |
468 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | | |
469 | USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK; | |
470 | #else | |
471 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK; | |
472 | #endif | |
473 | ||
474 | if (info->tty) | |
475 | clear_bit(TTY_IO_ERROR, &info->tty->flags); | |
476 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; | |
477 | ||
478 | /* | |
479 | * and set the speed of the serial port | |
480 | */ | |
481 | ||
482 | change_speed(info); | |
483 | ||
484 | info->flags |= S_INITIALIZED; | |
727dda80 | 485 | local_irq_restore(flags); |
1da177e4 LT |
486 | return 0; |
487 | } | |
488 | ||
489 | /* | |
490 | * This routine will shutdown a serial port; interrupts are disabled, and | |
491 | * DTR is dropped if the hangup on close termio flag is on. | |
492 | */ | |
493 | static void shutdown(struct m68k_serial * info) | |
494 | { | |
495 | m68328_uart *uart = &uart_addr[info->line]; | |
496 | unsigned long flags; | |
497 | ||
498 | uart->ustcnt = 0; /* All off! */ | |
499 | if (!(info->flags & S_INITIALIZED)) | |
500 | return; | |
501 | ||
727dda80 | 502 | local_irq_save(flags); |
1da177e4 LT |
503 | |
504 | if (info->xmit_buf) { | |
505 | free_page((unsigned long) info->xmit_buf); | |
506 | info->xmit_buf = 0; | |
507 | } | |
508 | ||
509 | if (info->tty) | |
510 | set_bit(TTY_IO_ERROR, &info->tty->flags); | |
511 | ||
512 | info->flags &= ~S_INITIALIZED; | |
727dda80 | 513 | local_irq_restore(flags); |
1da177e4 LT |
514 | } |
515 | ||
516 | struct { | |
517 | int divisor, prescale; | |
518 | } | |
519 | #ifndef CONFIG_M68VZ328 | |
520 | hw_baud_table[18] = { | |
521 | {0,0}, /* 0 */ | |
522 | {0,0}, /* 50 */ | |
523 | {0,0}, /* 75 */ | |
524 | {0,0}, /* 110 */ | |
525 | {0,0}, /* 134 */ | |
526 | {0,0}, /* 150 */ | |
527 | {0,0}, /* 200 */ | |
528 | {7,0x26}, /* 300 */ | |
529 | {6,0x26}, /* 600 */ | |
530 | {5,0x26}, /* 1200 */ | |
531 | {0,0}, /* 1800 */ | |
532 | {4,0x26}, /* 2400 */ | |
533 | {3,0x26}, /* 4800 */ | |
534 | {2,0x26}, /* 9600 */ | |
535 | {1,0x26}, /* 19200 */ | |
536 | {0,0x26}, /* 38400 */ | |
537 | {1,0x38}, /* 57600 */ | |
538 | {0,0x38}, /* 115200 */ | |
539 | }; | |
540 | #else | |
541 | hw_baud_table[18] = { | |
542 | {0,0}, /* 0 */ | |
543 | {0,0}, /* 50 */ | |
544 | {0,0}, /* 75 */ | |
545 | {0,0}, /* 110 */ | |
546 | {0,0}, /* 134 */ | |
547 | {0,0}, /* 150 */ | |
548 | {0,0}, /* 200 */ | |
549 | {0,0}, /* 300 */ | |
550 | {7,0x26}, /* 600 */ | |
551 | {6,0x26}, /* 1200 */ | |
552 | {0,0}, /* 1800 */ | |
553 | {5,0x26}, /* 2400 */ | |
554 | {4,0x26}, /* 4800 */ | |
555 | {3,0x26}, /* 9600 */ | |
556 | {2,0x26}, /* 19200 */ | |
557 | {1,0x26}, /* 38400 */ | |
558 | {0,0x26}, /* 57600 */ | |
559 | {1,0x38}, /* 115200 */ | |
560 | }; | |
561 | #endif | |
562 | /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */ | |
563 | ||
564 | /* | |
565 | * This routine is called to set the UART divisor registers to match | |
566 | * the specified baud rate for a serial port. | |
567 | */ | |
568 | static void change_speed(struct m68k_serial *info) | |
569 | { | |
570 | m68328_uart *uart = &uart_addr[info->line]; | |
571 | unsigned short port; | |
572 | unsigned short ustcnt; | |
573 | unsigned cflag; | |
574 | int i; | |
575 | ||
576 | if (!info->tty || !info->tty->termios) | |
577 | return; | |
578 | cflag = info->tty->termios->c_cflag; | |
579 | if (!(port = info->port)) | |
580 | return; | |
581 | ||
582 | ustcnt = uart->ustcnt; | |
583 | uart->ustcnt = ustcnt & ~USTCNT_TXEN; | |
584 | ||
585 | i = cflag & CBAUD; | |
586 | if (i & CBAUDEX) { | |
587 | i = (i & ~CBAUDEX) + B38400; | |
588 | } | |
589 | ||
590 | info->baud = baud_table[i]; | |
591 | uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
592 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
593 | ||
594 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
595 | ||
596 | if ((cflag & CSIZE) == CS8) | |
597 | ustcnt |= USTCNT_8_7; | |
598 | ||
599 | if (cflag & CSTOPB) | |
600 | ustcnt |= USTCNT_STOP; | |
601 | ||
602 | if (cflag & PARENB) | |
603 | ustcnt |= USTCNT_PARITYEN; | |
604 | if (cflag & PARODD) | |
605 | ustcnt |= USTCNT_ODD_EVEN; | |
606 | ||
607 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
608 | if (cflag & CRTSCTS) { | |
609 | uart->utx.w &= ~ UTX_NOCTS; | |
610 | } else { | |
611 | uart->utx.w |= UTX_NOCTS; | |
612 | } | |
613 | #endif | |
614 | ||
615 | ustcnt |= USTCNT_TXEN; | |
616 | ||
617 | uart->ustcnt = ustcnt; | |
618 | return; | |
619 | } | |
620 | ||
621 | /* | |
622 | * Fair output driver allows a process to speak. | |
623 | */ | |
624 | static void rs_fair_output(void) | |
625 | { | |
626 | int left; /* Output no more than that */ | |
627 | unsigned long flags; | |
628 | struct m68k_serial *info = &m68k_soft[0]; | |
629 | char c; | |
630 | ||
631 | if (info == 0) return; | |
632 | if (info->xmit_buf == 0) return; | |
633 | ||
727dda80 | 634 | local_irq_save(flags); |
1da177e4 LT |
635 | left = info->xmit_cnt; |
636 | while (left != 0) { | |
637 | c = info->xmit_buf[info->xmit_tail]; | |
638 | info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1); | |
639 | info->xmit_cnt--; | |
727dda80 | 640 | local_irq_restore(flags); |
1da177e4 LT |
641 | |
642 | rs_put_char(c); | |
643 | ||
727dda80 | 644 | local_irq_save(flags); |
1da177e4 LT |
645 | left = min(info->xmit_cnt, left-1); |
646 | } | |
647 | ||
648 | /* Last character is being transmitted now (hopefully). */ | |
649 | udelay(5); | |
650 | ||
727dda80 | 651 | local_irq_restore(flags); |
1da177e4 LT |
652 | return; |
653 | } | |
654 | ||
655 | /* | |
656 | * m68k_console_print is registered for printk. | |
657 | */ | |
658 | void console_print_68328(const char *p) | |
659 | { | |
660 | char c; | |
661 | ||
662 | while((c=*(p++)) != 0) { | |
663 | if(c == '\n') | |
664 | rs_put_char('\r'); | |
665 | rs_put_char(c); | |
666 | } | |
667 | ||
668 | /* Comment this if you want to have a strict interrupt-driven output */ | |
669 | rs_fair_output(); | |
670 | ||
671 | return; | |
672 | } | |
673 | ||
674 | static void rs_set_ldisc(struct tty_struct *tty) | |
675 | { | |
676 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
677 | ||
678 | if (serial_paranoia_check(info, tty->name, "rs_set_ldisc")) | |
679 | return; | |
680 | ||
681 | info->is_cons = (tty->termios->c_line == N_TTY); | |
682 | ||
683 | printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off"); | |
684 | } | |
685 | ||
686 | static void rs_flush_chars(struct tty_struct *tty) | |
687 | { | |
688 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
689 | m68328_uart *uart = &uart_addr[info->line]; | |
690 | unsigned long flags; | |
691 | ||
692 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) | |
693 | return; | |
694 | #ifndef USE_INTS | |
695 | for(;;) { | |
696 | #endif | |
697 | ||
698 | /* Enable transmitter */ | |
727dda80 | 699 | local_irq_save(flags); |
1da177e4 LT |
700 | |
701 | if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || | |
702 | !info->xmit_buf) { | |
727dda80 | 703 | local_irq_restore(flags); |
1da177e4 LT |
704 | return; |
705 | } | |
706 | ||
707 | #ifdef USE_INTS | |
708 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
709 | #else | |
710 | uart->ustcnt |= USTCNT_TXEN; | |
711 | #endif | |
712 | ||
713 | #ifdef USE_INTS | |
714 | if (uart->utx.w & UTX_TX_AVAIL) { | |
715 | #else | |
716 | if (1) { | |
717 | #endif | |
718 | /* Send char */ | |
719 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
720 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
721 | info->xmit_cnt--; | |
722 | } | |
723 | ||
724 | #ifndef USE_INTS | |
725 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
726 | } | |
727 | #endif | |
727dda80 | 728 | local_irq_restore(flags); |
1da177e4 LT |
729 | } |
730 | ||
731 | extern void console_printn(const char * b, int count); | |
732 | ||
733 | static int rs_write(struct tty_struct * tty, | |
734 | const unsigned char *buf, int count) | |
735 | { | |
736 | int c, total = 0; | |
737 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
738 | m68328_uart *uart = &uart_addr[info->line]; | |
739 | unsigned long flags; | |
740 | ||
741 | if (serial_paranoia_check(info, tty->name, "rs_write")) | |
742 | return 0; | |
743 | ||
744 | if (!tty || !info->xmit_buf) | |
745 | return 0; | |
746 | ||
727dda80 | 747 | local_save_flags(flags); |
1da177e4 | 748 | while (1) { |
727dda80 | 749 | local_irq_disable(); |
1da177e4 LT |
750 | c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, |
751 | SERIAL_XMIT_SIZE - info->xmit_head)); | |
727dda80 GU |
752 | local_irq_restore(flags); |
753 | ||
1da177e4 LT |
754 | if (c <= 0) |
755 | break; | |
756 | ||
757 | memcpy(info->xmit_buf + info->xmit_head, buf, c); | |
727dda80 GU |
758 | |
759 | local_irq_disable(); | |
1da177e4 LT |
760 | info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); |
761 | info->xmit_cnt += c; | |
727dda80 | 762 | local_irq_restore(flags); |
1da177e4 LT |
763 | buf += c; |
764 | count -= c; | |
765 | total += c; | |
766 | } | |
767 | ||
768 | if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) { | |
769 | /* Enable transmitter */ | |
727dda80 | 770 | local_irq_disable(); |
1da177e4 LT |
771 | #ifndef USE_INTS |
772 | while(info->xmit_cnt) { | |
773 | #endif | |
774 | ||
775 | uart->ustcnt |= USTCNT_TXEN; | |
776 | #ifdef USE_INTS | |
777 | uart->ustcnt |= USTCNT_TX_INTR_MASK; | |
778 | #else | |
779 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
780 | #endif | |
781 | if (uart->utx.w & UTX_TX_AVAIL) { | |
782 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
783 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
784 | info->xmit_cnt--; | |
785 | } | |
786 | ||
787 | #ifndef USE_INTS | |
788 | } | |
789 | #endif | |
727dda80 | 790 | local_irq_restore(flags); |
1da177e4 | 791 | } |
727dda80 | 792 | |
1da177e4 LT |
793 | return total; |
794 | } | |
795 | ||
796 | static int rs_write_room(struct tty_struct *tty) | |
797 | { | |
798 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
799 | int ret; | |
800 | ||
801 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) | |
802 | return 0; | |
803 | ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; | |
804 | if (ret < 0) | |
805 | ret = 0; | |
806 | return ret; | |
807 | } | |
808 | ||
809 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
810 | { | |
811 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
812 | ||
813 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) | |
814 | return 0; | |
815 | return info->xmit_cnt; | |
816 | } | |
817 | ||
818 | static void rs_flush_buffer(struct tty_struct *tty) | |
819 | { | |
820 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
727dda80 | 821 | unsigned long flags; |
1da177e4 LT |
822 | |
823 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) | |
824 | return; | |
727dda80 | 825 | local_irq_save(flags); |
1da177e4 | 826 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
727dda80 | 827 | local_irq_restore(flags); |
1da177e4 LT |
828 | tty_wakeup(tty); |
829 | } | |
830 | ||
831 | /* | |
832 | * ------------------------------------------------------------ | |
833 | * rs_throttle() | |
834 | * | |
835 | * This routine is called by the upper-layer tty layer to signal that | |
836 | * incoming characters should be throttled. | |
837 | * ------------------------------------------------------------ | |
838 | */ | |
839 | static void rs_throttle(struct tty_struct * tty) | |
840 | { | |
841 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
842 | ||
843 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) | |
844 | return; | |
845 | ||
846 | if (I_IXOFF(tty)) | |
847 | info->x_char = STOP_CHAR(tty); | |
848 | ||
849 | /* Turn off RTS line (do this atomic) */ | |
850 | } | |
851 | ||
852 | static void rs_unthrottle(struct tty_struct * tty) | |
853 | { | |
854 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
855 | ||
856 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) | |
857 | return; | |
858 | ||
859 | if (I_IXOFF(tty)) { | |
860 | if (info->x_char) | |
861 | info->x_char = 0; | |
862 | else | |
863 | info->x_char = START_CHAR(tty); | |
864 | } | |
865 | ||
866 | /* Assert RTS line (do this atomic) */ | |
867 | } | |
868 | ||
869 | /* | |
870 | * ------------------------------------------------------------ | |
871 | * rs_ioctl() and friends | |
872 | * ------------------------------------------------------------ | |
873 | */ | |
874 | ||
875 | static int get_serial_info(struct m68k_serial * info, | |
876 | struct serial_struct * retinfo) | |
877 | { | |
878 | struct serial_struct tmp; | |
879 | ||
880 | if (!retinfo) | |
881 | return -EFAULT; | |
882 | memset(&tmp, 0, sizeof(tmp)); | |
883 | tmp.type = info->type; | |
884 | tmp.line = info->line; | |
885 | tmp.port = info->port; | |
886 | tmp.irq = info->irq; | |
887 | tmp.flags = info->flags; | |
888 | tmp.baud_base = info->baud_base; | |
889 | tmp.close_delay = info->close_delay; | |
890 | tmp.closing_wait = info->closing_wait; | |
891 | tmp.custom_divisor = info->custom_divisor; | |
892 | copy_to_user(retinfo,&tmp,sizeof(*retinfo)); | |
893 | return 0; | |
894 | } | |
895 | ||
896 | static int set_serial_info(struct m68k_serial * info, | |
897 | struct serial_struct * new_info) | |
898 | { | |
899 | struct serial_struct new_serial; | |
900 | struct m68k_serial old_info; | |
901 | int retval = 0; | |
902 | ||
903 | if (!new_info) | |
904 | return -EFAULT; | |
905 | copy_from_user(&new_serial,new_info,sizeof(new_serial)); | |
906 | old_info = *info; | |
907 | ||
908 | if (!capable(CAP_SYS_ADMIN)) { | |
909 | if ((new_serial.baud_base != info->baud_base) || | |
910 | (new_serial.type != info->type) || | |
911 | (new_serial.close_delay != info->close_delay) || | |
912 | ((new_serial.flags & ~S_USR_MASK) != | |
913 | (info->flags & ~S_USR_MASK))) | |
914 | return -EPERM; | |
915 | info->flags = ((info->flags & ~S_USR_MASK) | | |
916 | (new_serial.flags & S_USR_MASK)); | |
917 | info->custom_divisor = new_serial.custom_divisor; | |
918 | goto check_and_exit; | |
919 | } | |
920 | ||
921 | if (info->count > 1) | |
922 | return -EBUSY; | |
923 | ||
924 | /* | |
925 | * OK, past this point, all the error checking has been done. | |
926 | * At this point, we start making changes..... | |
927 | */ | |
928 | ||
929 | info->baud_base = new_serial.baud_base; | |
930 | info->flags = ((info->flags & ~S_FLAGS) | | |
931 | (new_serial.flags & S_FLAGS)); | |
932 | info->type = new_serial.type; | |
933 | info->close_delay = new_serial.close_delay; | |
934 | info->closing_wait = new_serial.closing_wait; | |
935 | ||
936 | check_and_exit: | |
937 | retval = startup(info); | |
938 | return retval; | |
939 | } | |
940 | ||
941 | /* | |
942 | * get_lsr_info - get line status register info | |
943 | * | |
944 | * Purpose: Let user call ioctl() to get info when the UART physically | |
945 | * is emptied. On bus types like RS485, the transmitter must | |
946 | * release the bus after transmitting. This must be done when | |
947 | * the transmit shift register is empty, not be done when the | |
948 | * transmit holding register is empty. This functionality | |
949 | * allows an RS485 driver to be written in user space. | |
950 | */ | |
951 | static int get_lsr_info(struct m68k_serial * info, unsigned int *value) | |
952 | { | |
953 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
954 | m68328_uart *uart = &uart_addr[info->line]; | |
955 | #endif | |
956 | unsigned char status; | |
727dda80 | 957 | unsigned long flags; |
1da177e4 | 958 | |
727dda80 | 959 | local_irq_save(flags); |
1da177e4 LT |
960 | #ifdef CONFIG_SERIAL_68328_RTS_CTS |
961 | status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0; | |
962 | #else | |
963 | status = 0; | |
964 | #endif | |
727dda80 | 965 | local_irq_restore(flags); |
1da177e4 LT |
966 | put_user(status,value); |
967 | return 0; | |
968 | } | |
969 | ||
970 | /* | |
971 | * This routine sends a break character out the serial port. | |
972 | */ | |
6a72c7ba | 973 | static void send_break(struct m68k_serial * info, unsigned int duration) |
1da177e4 LT |
974 | { |
975 | m68328_uart *uart = &uart_addr[info->line]; | |
976 | unsigned long flags; | |
977 | if (!info->port) | |
978 | return; | |
727dda80 | 979 | local_irq_save(flags); |
1da177e4 LT |
980 | #ifdef USE_INTS |
981 | uart->utx.w |= UTX_SEND_BREAK; | |
6a72c7ba | 982 | msleep_interruptible(duration); |
1da177e4 LT |
983 | uart->utx.w &= ~UTX_SEND_BREAK; |
984 | #endif | |
727dda80 | 985 | local_irq_restore(flags); |
1da177e4 LT |
986 | } |
987 | ||
988 | static int rs_ioctl(struct tty_struct *tty, struct file * file, | |
989 | unsigned int cmd, unsigned long arg) | |
990 | { | |
991 | int error; | |
992 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
993 | int retval; | |
994 | ||
995 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
996 | return -ENODEV; | |
997 | ||
998 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
999 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && | |
1000 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { | |
1001 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1002 | return -EIO; | |
1003 | } | |
1004 | ||
1005 | switch (cmd) { | |
1006 | case TCSBRK: /* SVID version: non-zero arg --> no break */ | |
1007 | retval = tty_check_change(tty); | |
1008 | if (retval) | |
1009 | return retval; | |
1010 | tty_wait_until_sent(tty, 0); | |
1011 | if (!arg) | |
6a72c7ba | 1012 | send_break(info, 250); /* 1/4 second */ |
1da177e4 LT |
1013 | return 0; |
1014 | case TCSBRKP: /* support for POSIX tcsendbreak() */ | |
1015 | retval = tty_check_change(tty); | |
1016 | if (retval) | |
1017 | return retval; | |
1018 | tty_wait_until_sent(tty, 0); | |
6a72c7ba | 1019 | send_break(info, arg ? arg*(100) : 250); |
1da177e4 | 1020 | return 0; |
1da177e4 LT |
1021 | case TIOCGSERIAL: |
1022 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
1023 | sizeof(struct serial_struct))) | |
1024 | return get_serial_info(info, | |
1025 | (struct serial_struct *) arg); | |
1026 | return -EFAULT; | |
1027 | case TIOCSSERIAL: | |
1028 | return set_serial_info(info, | |
1029 | (struct serial_struct *) arg); | |
1030 | case TIOCSERGETLSR: /* Get line status register */ | |
1031 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
727dda80 | 1032 | sizeof(unsigned int))) |
1da177e4 LT |
1033 | return get_lsr_info(info, (unsigned int *) arg); |
1034 | return -EFAULT; | |
1035 | case TIOCSERGSTRUCT: | |
1036 | if (!access_ok(VERIFY_WRITE, (void *) arg, | |
1037 | sizeof(struct m68k_serial))) | |
1038 | return -EFAULT; | |
1039 | copy_to_user((struct m68k_serial *) arg, | |
1040 | info, sizeof(struct m68k_serial)); | |
1041 | return 0; | |
1042 | ||
1043 | default: | |
1044 | return -ENOIOCTLCMD; | |
1045 | } | |
1046 | return 0; | |
1047 | } | |
1048 | ||
606d099c | 1049 | static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
1da177e4 LT |
1050 | { |
1051 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
1052 | ||
1da177e4 LT |
1053 | change_speed(info); |
1054 | ||
1055 | if ((old_termios->c_cflag & CRTSCTS) && | |
1056 | !(tty->termios->c_cflag & CRTSCTS)) { | |
1057 | tty->hw_stopped = 0; | |
1058 | rs_start(tty); | |
1059 | } | |
1060 | ||
1061 | } | |
1062 | ||
1063 | /* | |
1064 | * ------------------------------------------------------------ | |
1065 | * rs_close() | |
1066 | * | |
1067 | * This routine is called when the serial port gets closed. First, we | |
1068 | * wait for the last remaining data to be sent. Then, we unlink its | |
1069 | * S structure from the interrupt chain if necessary, and we free | |
1070 | * that IRQ if nothing is left in the chain. | |
1071 | * ------------------------------------------------------------ | |
1072 | */ | |
1073 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
1074 | { | |
1075 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1076 | m68328_uart *uart = &uart_addr[info->line]; | |
1077 | unsigned long flags; | |
1078 | ||
1079 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) | |
1080 | return; | |
1081 | ||
727dda80 | 1082 | local_irq_save(flags); |
1da177e4 LT |
1083 | |
1084 | if (tty_hung_up_p(filp)) { | |
727dda80 | 1085 | local_irq_restore(flags); |
1da177e4 LT |
1086 | return; |
1087 | } | |
1088 | ||
1089 | if ((tty->count == 1) && (info->count != 1)) { | |
1090 | /* | |
1091 | * Uh, oh. tty->count is 1, which means that the tty | |
1092 | * structure will be freed. Info->count should always | |
1093 | * be one in these conditions. If it's greater than | |
1094 | * one, we've got real problems, since it means the | |
1095 | * serial port won't be shutdown. | |
1096 | */ | |
1097 | printk("rs_close: bad serial port count; tty->count is 1, " | |
1098 | "info->count is %d\n", info->count); | |
1099 | info->count = 1; | |
1100 | } | |
1101 | if (--info->count < 0) { | |
1102 | printk("rs_close: bad serial port count for ttyS%d: %d\n", | |
1103 | info->line, info->count); | |
1104 | info->count = 0; | |
1105 | } | |
1106 | if (info->count) { | |
727dda80 | 1107 | local_irq_restore(flags); |
1da177e4 LT |
1108 | return; |
1109 | } | |
1110 | info->flags |= S_CLOSING; | |
1111 | /* | |
1112 | * Now we wait for the transmit buffer to clear; and we notify | |
1113 | * the line discipline to only process XON/XOFF characters. | |
1114 | */ | |
1115 | tty->closing = 1; | |
1116 | if (info->closing_wait != S_CLOSING_WAIT_NONE) | |
1117 | tty_wait_until_sent(tty, info->closing_wait); | |
1118 | /* | |
1119 | * At this point we stop accepting input. To do this, we | |
1120 | * disable the receive line status interrupts, and tell the | |
1121 | * interrupt driver to stop checking the data ready bit in the | |
1122 | * line status register. | |
1123 | */ | |
1124 | ||
1125 | uart->ustcnt &= ~USTCNT_RXEN; | |
1126 | uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK); | |
1127 | ||
1128 | shutdown(info); | |
978e595f | 1129 | rs_flush_buffer(tty); |
1da177e4 LT |
1130 | |
1131 | tty_ldisc_flush(tty); | |
1132 | tty->closing = 0; | |
1133 | info->event = 0; | |
1134 | info->tty = 0; | |
1135 | #warning "This is not and has never been valid so fix it" | |
1136 | #if 0 | |
1137 | if (tty->ldisc.num != ldiscs[N_TTY].num) { | |
1138 | if (tty->ldisc.close) | |
1139 | (tty->ldisc.close)(tty); | |
1140 | tty->ldisc = ldiscs[N_TTY]; | |
1141 | tty->termios->c_line = N_TTY; | |
1142 | if (tty->ldisc.open) | |
1143 | (tty->ldisc.open)(tty); | |
1144 | } | |
1145 | #endif | |
1146 | if (info->blocked_open) { | |
1147 | if (info->close_delay) { | |
1148 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); | |
1149 | } | |
1150 | wake_up_interruptible(&info->open_wait); | |
1151 | } | |
1152 | info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING); | |
1153 | wake_up_interruptible(&info->close_wait); | |
727dda80 | 1154 | local_irq_restore(flags); |
1da177e4 LT |
1155 | } |
1156 | ||
1157 | /* | |
1158 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
1159 | */ | |
1160 | void rs_hangup(struct tty_struct *tty) | |
1161 | { | |
1162 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1163 | ||
1164 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) | |
1165 | return; | |
1166 | ||
1167 | rs_flush_buffer(tty); | |
1168 | shutdown(info); | |
1169 | info->event = 0; | |
1170 | info->count = 0; | |
1171 | info->flags &= ~S_NORMAL_ACTIVE; | |
1172 | info->tty = 0; | |
1173 | wake_up_interruptible(&info->open_wait); | |
1174 | } | |
1175 | ||
1176 | /* | |
1177 | * ------------------------------------------------------------ | |
1178 | * rs_open() and friends | |
1179 | * ------------------------------------------------------------ | |
1180 | */ | |
1181 | static int block_til_ready(struct tty_struct *tty, struct file * filp, | |
1182 | struct m68k_serial *info) | |
1183 | { | |
1184 | DECLARE_WAITQUEUE(wait, current); | |
1185 | int retval; | |
1186 | int do_clocal = 0; | |
1187 | ||
1188 | /* | |
1189 | * If the device is in the middle of being closed, then block | |
1190 | * until it's done, and then try again. | |
1191 | */ | |
1192 | if (info->flags & S_CLOSING) { | |
1193 | interruptible_sleep_on(&info->close_wait); | |
1194 | #ifdef SERIAL_DO_RESTART | |
1195 | if (info->flags & S_HUP_NOTIFY) | |
1196 | return -EAGAIN; | |
1197 | else | |
1198 | return -ERESTARTSYS; | |
1199 | #else | |
1200 | return -EAGAIN; | |
1201 | #endif | |
1202 | } | |
1203 | ||
1204 | /* | |
1205 | * If non-blocking mode is set, or the port is not enabled, | |
1206 | * then make the check up front and then exit. | |
1207 | */ | |
1208 | if ((filp->f_flags & O_NONBLOCK) || | |
1209 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
1210 | info->flags |= S_NORMAL_ACTIVE; | |
1211 | return 0; | |
1212 | } | |
1213 | ||
1214 | if (tty->termios->c_cflag & CLOCAL) | |
1215 | do_clocal = 1; | |
1216 | ||
1217 | /* | |
1218 | * Block waiting for the carrier detect and the line to become | |
1219 | * free (i.e., not in use by the callout). While we are in | |
1220 | * this loop, info->count is dropped by one, so that | |
1221 | * rs_close() knows when to free things. We restore it upon | |
1222 | * exit, either normal or abnormal. | |
1223 | */ | |
1224 | retval = 0; | |
1225 | add_wait_queue(&info->open_wait, &wait); | |
1226 | ||
1227 | info->count--; | |
1228 | info->blocked_open++; | |
1229 | while (1) { | |
727dda80 | 1230 | local_irq_disable(); |
1da177e4 | 1231 | m68k_rtsdtr(info, 1); |
727dda80 | 1232 | local_irq_enable(); |
1da177e4 LT |
1233 | current->state = TASK_INTERRUPTIBLE; |
1234 | if (tty_hung_up_p(filp) || | |
1235 | !(info->flags & S_INITIALIZED)) { | |
1236 | #ifdef SERIAL_DO_RESTART | |
1237 | if (info->flags & S_HUP_NOTIFY) | |
1238 | retval = -EAGAIN; | |
1239 | else | |
1240 | retval = -ERESTARTSYS; | |
1241 | #else | |
1242 | retval = -EAGAIN; | |
1243 | #endif | |
1244 | break; | |
1245 | } | |
1246 | if (!(info->flags & S_CLOSING) && do_clocal) | |
1247 | break; | |
1248 | if (signal_pending(current)) { | |
1249 | retval = -ERESTARTSYS; | |
1250 | break; | |
1251 | } | |
1252 | schedule(); | |
1253 | } | |
1254 | current->state = TASK_RUNNING; | |
1255 | remove_wait_queue(&info->open_wait, &wait); | |
1256 | if (!tty_hung_up_p(filp)) | |
1257 | info->count++; | |
1258 | info->blocked_open--; | |
1259 | ||
1260 | if (retval) | |
1261 | return retval; | |
1262 | info->flags |= S_NORMAL_ACTIVE; | |
1263 | return 0; | |
1264 | } | |
1265 | ||
1266 | /* | |
1267 | * This routine is called whenever a serial port is opened. It | |
1268 | * enables interrupts for a serial port, linking in its S structure into | |
1269 | * the IRQ chain. It also performs the serial-specific | |
1270 | * initialization for the tty structure. | |
1271 | */ | |
1272 | int rs_open(struct tty_struct *tty, struct file * filp) | |
1273 | { | |
1274 | struct m68k_serial *info; | |
1275 | int retval, line; | |
1276 | ||
1277 | line = tty->index; | |
1278 | ||
1279 | if (line >= NR_PORTS || line < 0) /* we have exactly one */ | |
1280 | return -ENODEV; | |
1281 | ||
1282 | info = &m68k_soft[line]; | |
1283 | ||
1284 | if (serial_paranoia_check(info, tty->name, "rs_open")) | |
1285 | return -ENODEV; | |
1286 | ||
1287 | info->count++; | |
1288 | tty->driver_data = info; | |
1289 | info->tty = tty; | |
1290 | ||
1291 | /* | |
1292 | * Start up serial port | |
1293 | */ | |
1294 | retval = startup(info); | |
1295 | if (retval) | |
1296 | return retval; | |
1297 | ||
1298 | return block_til_ready(tty, filp, info); | |
1299 | } | |
1300 | ||
1301 | /* Finally, routines used to initialize the serial driver. */ | |
1302 | ||
1303 | static void show_serial_version(void) | |
1304 | { | |
1305 | printk("MC68328 serial driver version 1.00\n"); | |
1306 | } | |
1307 | ||
b68e31d0 | 1308 | static const struct tty_operations rs_ops = { |
1da177e4 LT |
1309 | .open = rs_open, |
1310 | .close = rs_close, | |
1311 | .write = rs_write, | |
1312 | .flush_chars = rs_flush_chars, | |
1313 | .write_room = rs_write_room, | |
1314 | .chars_in_buffer = rs_chars_in_buffer, | |
1315 | .flush_buffer = rs_flush_buffer, | |
1316 | .ioctl = rs_ioctl, | |
1317 | .throttle = rs_throttle, | |
1318 | .unthrottle = rs_unthrottle, | |
1319 | .set_termios = rs_set_termios, | |
1320 | .stop = rs_stop, | |
1321 | .start = rs_start, | |
1322 | .hangup = rs_hangup, | |
1323 | .set_ldisc = rs_set_ldisc, | |
1324 | }; | |
1325 | ||
1326 | /* rs_init inits the driver */ | |
1327 | static int __init | |
1328 | rs68328_init(void) | |
1329 | { | |
1330 | int flags, i; | |
1331 | struct m68k_serial *info; | |
1332 | ||
1333 | serial_driver = alloc_tty_driver(NR_PORTS); | |
1334 | if (!serial_driver) | |
1335 | return -ENOMEM; | |
1336 | ||
1337 | show_serial_version(); | |
1338 | ||
1339 | /* Initialize the tty_driver structure */ | |
1340 | /* SPARC: Not all of this is exactly right for us. */ | |
1341 | ||
1342 | serial_driver->name = "ttyS"; | |
1343 | serial_driver->major = TTY_MAJOR; | |
1344 | serial_driver->minor_start = 64; | |
1345 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
1346 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
1347 | serial_driver->init_termios = tty_std_termios; | |
1348 | serial_driver->init_termios.c_cflag = | |
1349 | m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL; | |
1350 | serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
1351 | tty_set_operations(serial_driver, &rs_ops); | |
1352 | ||
1353 | if (tty_register_driver(serial_driver)) { | |
1354 | put_tty_driver(serial_driver); | |
1355 | printk(KERN_ERR "Couldn't register serial driver\n"); | |
1356 | return -ENOMEM; | |
1357 | } | |
1358 | ||
727dda80 | 1359 | local_irq_save(flags); |
1da177e4 LT |
1360 | |
1361 | for(i=0;i<NR_PORTS;i++) { | |
1362 | ||
1363 | info = &m68k_soft[i]; | |
1364 | info->magic = SERIAL_MAGIC; | |
1365 | info->port = (int) &uart_addr[i]; | |
1366 | info->tty = 0; | |
1367 | info->irq = uart_irqs[i]; | |
1368 | info->custom_divisor = 16; | |
1369 | info->close_delay = 50; | |
1370 | info->closing_wait = 3000; | |
1371 | info->x_char = 0; | |
1372 | info->event = 0; | |
1373 | info->count = 0; | |
1374 | info->blocked_open = 0; | |
931f9cde GU |
1375 | INIT_WORK(&info->tqueue, do_softint); |
1376 | INIT_WORK(&info->tqueue_hangup, do_serial_hangup); | |
1da177e4 LT |
1377 | init_waitqueue_head(&info->open_wait); |
1378 | init_waitqueue_head(&info->close_wait); | |
1379 | info->line = i; | |
1380 | info->is_cons = 1; /* Means shortcuts work */ | |
1381 | ||
1382 | printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line, | |
1383 | info->port, info->irq); | |
1384 | printk(" is a builtin MC68328 UART\n"); | |
1385 | ||
1386 | IRQ_ports[info->irq] = info; /* waste of space */ | |
1387 | ||
1388 | #ifdef CONFIG_M68VZ328 | |
1389 | if (i > 0 ) | |
1390 | PJSEL &= 0xCF; /* PSW enable second port output */ | |
1391 | #endif | |
1392 | ||
1393 | if (request_irq(uart_irqs[i], | |
1394 | rs_interrupt, | |
7c74806b | 1395 | IRQF_DISABLED, |
1da177e4 LT |
1396 | "M68328_UART", NULL)) |
1397 | panic("Unable to attach 68328 serial interrupt\n"); | |
1da177e4 | 1398 | } |
727dda80 | 1399 | local_irq_restore(flags); |
1da177e4 LT |
1400 | return 0; |
1401 | } | |
1402 | ||
1da177e4 LT |
1403 | module_init(rs68328_init); |
1404 | ||
1405 | ||
1406 | ||
1407 | static void m68328_set_baud(void) | |
1408 | { | |
1409 | unsigned short ustcnt; | |
1410 | int i; | |
1411 | ||
1412 | ustcnt = USTCNT; | |
1413 | USTCNT = ustcnt & ~USTCNT_TXEN; | |
1414 | ||
1415 | again: | |
1416 | for (i = 0; i < sizeof(baud_table) / sizeof(baud_table[0]); i++) | |
1417 | if (baud_table[i] == m68328_console_baud) | |
1418 | break; | |
1419 | if (i >= sizeof(baud_table) / sizeof(baud_table[0])) { | |
1420 | m68328_console_baud = 9600; | |
1421 | goto again; | |
1422 | } | |
1423 | ||
1424 | UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
1425 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
1426 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
1427 | ustcnt |= USTCNT_8_7; | |
1428 | ustcnt |= USTCNT_TXEN; | |
1429 | USTCNT = ustcnt; | |
1430 | m68328_console_initted = 1; | |
1431 | return; | |
1432 | } | |
1433 | ||
1434 | ||
1435 | int m68328_console_setup(struct console *cp, char *arg) | |
1436 | { | |
1437 | int i, n = CONSOLE_BAUD_RATE; | |
1438 | ||
1439 | if (!cp) | |
1440 | return(-1); | |
1441 | ||
1442 | if (arg) | |
1443 | n = simple_strtoul(arg,NULL,0); | |
1444 | ||
1445 | for (i = 0; i < BAUD_TABLE_SIZE; i++) | |
1446 | if (baud_table[i] == n) | |
1447 | break; | |
1448 | if (i < BAUD_TABLE_SIZE) { | |
1449 | m68328_console_baud = n; | |
1450 | m68328_console_cbaud = 0; | |
1451 | if (i > 15) { | |
1452 | m68328_console_cbaud |= CBAUDEX; | |
1453 | i -= 15; | |
1454 | } | |
1455 | m68328_console_cbaud |= i; | |
1456 | } | |
1457 | ||
1458 | m68328_set_baud(); /* make sure baud rate changes */ | |
1459 | return(0); | |
1460 | } | |
1461 | ||
1462 | ||
1463 | static struct tty_driver *m68328_console_device(struct console *c, int *index) | |
1464 | { | |
1465 | *index = c->index; | |
1466 | return serial_driver; | |
1467 | } | |
1468 | ||
1469 | ||
1470 | void m68328_console_write (struct console *co, const char *str, | |
1471 | unsigned int count) | |
1472 | { | |
1473 | if (!m68328_console_initted) | |
1474 | m68328_set_baud(); | |
1475 | while (count--) { | |
1476 | if (*str == '\n') | |
1477 | rs_put_char('\r'); | |
1478 | rs_put_char( *str++ ); | |
1479 | } | |
1480 | } | |
1481 | ||
1482 | ||
1483 | static struct console m68328_driver = { | |
1484 | .name = "ttyS", | |
1485 | .write = m68328_console_write, | |
1486 | .device = m68328_console_device, | |
1487 | .setup = m68328_console_setup, | |
1488 | .flags = CON_PRINTBUFFER, | |
1489 | .index = -1, | |
1490 | }; | |
1491 | ||
1492 | ||
1493 | static int __init m68328_console_init(void) | |
1494 | { | |
1495 | register_console(&m68328_driver); | |
1496 | return 0; | |
1497 | } | |
1498 | ||
1499 | console_initcall(m68328_console_init); |