Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* 68328serial.c: Serial port driver for 68328 microcontroller |
2 | * | |
3 | * Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu> | |
4 | * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> | |
5 | * Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org> | |
6 | * Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com> | |
7 | * Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com> | |
8 | * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com> | |
9 | * | |
10 | * VZ Support/Fixes Evan Stawnyczy <e@lineo.ca> | |
11 | * Multiple UART support Daniel Potts <danielp@cse.unsw.edu.au> | |
12 | * Power management support Daniel Potts <danielp@cse.unsw.edu.au> | |
13 | * VZ Second Serial Port enable Phil Wilshire | |
14 | * 2.4/2.5 port David McCullough | |
15 | */ | |
16 | ||
17 | #include <asm/dbg.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/signal.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/timer.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/tty.h> | |
25 | #include <linux/tty_flip.h> | |
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 | ||
203 | static void rs_put_char(char ch) | |
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); |
1da177e4 LT |
217 | } |
218 | ||
219 | static void rs_start(struct tty_struct *tty) | |
220 | { | |
221 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
222 | m68328_uart *uart = &uart_addr[info->line]; | |
223 | unsigned long flags; | |
224 | ||
225 | if (serial_paranoia_check(info, tty->name, "rs_start")) | |
226 | return; | |
227 | ||
727dda80 | 228 | local_irq_save(flags); |
1da177e4 LT |
229 | if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) { |
230 | #ifdef USE_INTS | |
231 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
232 | #else | |
233 | uart->ustcnt |= USTCNT_TXEN; | |
234 | #endif | |
235 | } | |
727dda80 | 236 | local_irq_restore(flags); |
1da177e4 LT |
237 | } |
238 | ||
239 | /* Drop into either the boot monitor or kadb upon receiving a break | |
240 | * from keyboard/console input. | |
241 | */ | |
242 | static void batten_down_hatches(void) | |
243 | { | |
244 | /* Drop into the debugger */ | |
245 | } | |
246 | ||
41c28ff1 | 247 | static void status_handle(struct m68k_serial *info, unsigned short status) |
1da177e4 LT |
248 | { |
249 | #if 0 | |
250 | if(status & DCD) { | |
251 | if((info->tty->termios->c_cflag & CRTSCTS) && | |
252 | ((info->curregs[3] & AUTO_ENAB)==0)) { | |
253 | info->curregs[3] |= AUTO_ENAB; | |
254 | info->pendregs[3] |= AUTO_ENAB; | |
255 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
256 | } | |
257 | } else { | |
258 | if((info->curregs[3] & AUTO_ENAB)) { | |
259 | info->curregs[3] &= ~AUTO_ENAB; | |
260 | info->pendregs[3] &= ~AUTO_ENAB; | |
261 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
262 | } | |
263 | } | |
264 | #endif | |
265 | /* If this is console input and this is a | |
266 | * 'break asserted' status change interrupt | |
267 | * see if we can drop into the debugger | |
268 | */ | |
269 | if((status & URX_BREAK) && info->break_abort) | |
270 | batten_down_hatches(); | |
271 | return; | |
272 | } | |
273 | ||
7d12e780 | 274 | static void receive_chars(struct m68k_serial *info, unsigned short rx) |
1da177e4 LT |
275 | { |
276 | struct tty_struct *tty = info->tty; | |
277 | m68328_uart *uart = &uart_addr[info->line]; | |
33f0f88f | 278 | unsigned char ch, flag; |
1da177e4 LT |
279 | |
280 | /* | |
281 | * This do { } while() loop will get ALL chars out of Rx FIFO | |
282 | */ | |
283 | #ifndef CONFIG_XCOPILOT_BUGS | |
284 | do { | |
285 | #endif | |
286 | ch = GET_FIELD(rx, URX_RXDATA); | |
287 | ||
288 | if(info->is_cons) { | |
289 | if(URX_BREAK & rx) { /* whee, break received */ | |
290 | status_handle(info, rx); | |
291 | return; | |
292 | #ifdef CONFIG_MAGIC_SYSRQ | |
293 | } else if (ch == 0x10) { /* ^P */ | |
294 | show_state(); | |
295 | show_free_areas(); | |
296 | show_buffers(); | |
297 | /* show_net_buffers(); */ | |
298 | return; | |
299 | } else if (ch == 0x12) { /* ^R */ | |
804ebf46 | 300 | emergency_restart(); |
1da177e4 LT |
301 | return; |
302 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
303 | } | |
304 | /* It is a 'keyboard interrupt' ;-) */ | |
305 | #ifdef CONFIG_CONSOLE | |
306 | wake_up(&keypress_wait); | |
307 | #endif | |
308 | } | |
309 | ||
310 | if(!tty) | |
311 | goto clear_and_exit; | |
312 | ||
33f0f88f AC |
313 | flag = TTY_NORMAL; |
314 | ||
1da177e4 | 315 | if(rx & URX_PARITY_ERROR) { |
33f0f88f | 316 | flag = TTY_PARITY; |
1da177e4 LT |
317 | status_handle(info, rx); |
318 | } else if(rx & URX_OVRUN) { | |
33f0f88f | 319 | flag = TTY_OVERRUN; |
1da177e4 LT |
320 | status_handle(info, rx); |
321 | } else if(rx & URX_FRAME_ERROR) { | |
33f0f88f | 322 | flag = TTY_FRAME; |
1da177e4 | 323 | status_handle(info, rx); |
1da177e4 | 324 | } |
33f0f88f | 325 | tty_insert_flip_char(tty, ch, flag); |
1da177e4 LT |
326 | #ifndef CONFIG_XCOPILOT_BUGS |
327 | } while((rx = uart->urx.w) & URX_DATA_READY); | |
328 | #endif | |
329 | ||
8e63e66b | 330 | tty_schedule_flip(tty); |
1da177e4 LT |
331 | |
332 | clear_and_exit: | |
333 | return; | |
334 | } | |
335 | ||
41c28ff1 | 336 | static void transmit_chars(struct m68k_serial *info) |
1da177e4 LT |
337 | { |
338 | m68328_uart *uart = &uart_addr[info->line]; | |
339 | ||
340 | if (info->x_char) { | |
341 | /* Send next char */ | |
342 | uart->utx.b.txdata = info->x_char; | |
343 | info->x_char = 0; | |
344 | goto clear_and_return; | |
345 | } | |
346 | ||
347 | if((info->xmit_cnt <= 0) || info->tty->stopped) { | |
348 | /* That's peculiar... TX ints off */ | |
349 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
350 | goto clear_and_return; | |
351 | } | |
352 | ||
353 | /* Send char */ | |
354 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
355 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
356 | info->xmit_cnt--; | |
357 | ||
358 | if (info->xmit_cnt < WAKEUP_CHARS) | |
359 | schedule_work(&info->tqueue); | |
360 | ||
361 | if(info->xmit_cnt <= 0) { | |
362 | /* All done for now... TX ints off */ | |
363 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
364 | goto clear_and_return; | |
365 | } | |
366 | ||
367 | clear_and_return: | |
368 | /* Clear interrupt (should be auto)*/ | |
369 | return; | |
370 | } | |
371 | ||
372 | /* | |
373 | * This is the serial driver's generic interrupt routine | |
374 | */ | |
7d12e780 | 375 | irqreturn_t rs_interrupt(int irq, void *dev_id) |
1da177e4 LT |
376 | { |
377 | struct m68k_serial * info; | |
378 | m68328_uart *uart; | |
379 | unsigned short rx; | |
380 | unsigned short tx; | |
381 | ||
382 | info = IRQ_ports[irq]; | |
383 | if(!info) | |
384 | return IRQ_NONE; | |
385 | ||
386 | uart = &uart_addr[info->line]; | |
387 | rx = uart->urx.w; | |
388 | ||
389 | #ifdef USE_INTS | |
390 | tx = uart->utx.w; | |
391 | ||
7d12e780 | 392 | if (rx & URX_DATA_READY) receive_chars(info, rx); |
1da177e4 LT |
393 | if (tx & UTX_TX_AVAIL) transmit_chars(info); |
394 | #else | |
7d12e780 | 395 | receive_chars(info, rx); |
1da177e4 LT |
396 | #endif |
397 | return IRQ_HANDLED; | |
398 | } | |
399 | ||
931f9cde | 400 | static void do_softint(struct work_struct *work) |
1da177e4 | 401 | { |
931f9cde | 402 | struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue); |
1da177e4 LT |
403 | struct tty_struct *tty; |
404 | ||
405 | tty = info->tty; | |
406 | if (!tty) | |
407 | return; | |
408 | #if 0 | |
409 | if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { | |
410 | tty_wakeup(tty); | |
411 | } | |
412 | #endif | |
413 | } | |
414 | ||
415 | /* | |
416 | * This routine is called from the scheduler tqueue when the interrupt | |
417 | * routine has signalled that a hangup has occurred. The path of | |
418 | * hangup processing is: | |
419 | * | |
420 | * serial interrupt routine -> (scheduler tqueue) -> | |
421 | * do_serial_hangup() -> tty->hangup() -> rs_hangup() | |
422 | * | |
423 | */ | |
931f9cde | 424 | static void do_serial_hangup(struct work_struct *work) |
1da177e4 | 425 | { |
931f9cde | 426 | struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue_hangup); |
1da177e4 LT |
427 | struct tty_struct *tty; |
428 | ||
429 | tty = info->tty; | |
430 | if (!tty) | |
431 | return; | |
432 | ||
433 | tty_hangup(tty); | |
434 | } | |
435 | ||
436 | ||
437 | static int startup(struct m68k_serial * info) | |
438 | { | |
439 | m68328_uart *uart = &uart_addr[info->line]; | |
440 | unsigned long flags; | |
441 | ||
442 | if (info->flags & S_INITIALIZED) | |
443 | return 0; | |
444 | ||
445 | if (!info->xmit_buf) { | |
446 | info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL); | |
447 | if (!info->xmit_buf) | |
448 | return -ENOMEM; | |
449 | } | |
450 | ||
727dda80 | 451 | local_irq_save(flags); |
1da177e4 LT |
452 | |
453 | /* | |
454 | * Clear the FIFO buffers and disable them | |
455 | * (they will be reenabled in change_speed()) | |
456 | */ | |
457 | ||
458 | uart->ustcnt = USTCNT_UEN; | |
459 | info->xmit_fifo_size = 1; | |
460 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN; | |
461 | (void)uart->urx.w; | |
462 | ||
463 | /* | |
464 | * Finally, enable sequencing and interrupts | |
465 | */ | |
466 | #ifdef USE_INTS | |
467 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | | |
468 | USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK; | |
469 | #else | |
470 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK; | |
471 | #endif | |
472 | ||
473 | if (info->tty) | |
474 | clear_bit(TTY_IO_ERROR, &info->tty->flags); | |
475 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; | |
476 | ||
477 | /* | |
478 | * and set the speed of the serial port | |
479 | */ | |
480 | ||
481 | change_speed(info); | |
482 | ||
483 | info->flags |= S_INITIALIZED; | |
727dda80 | 484 | local_irq_restore(flags); |
1da177e4 LT |
485 | return 0; |
486 | } | |
487 | ||
488 | /* | |
489 | * This routine will shutdown a serial port; interrupts are disabled, and | |
490 | * DTR is dropped if the hangup on close termio flag is on. | |
491 | */ | |
492 | static void shutdown(struct m68k_serial * info) | |
493 | { | |
494 | m68328_uart *uart = &uart_addr[info->line]; | |
495 | unsigned long flags; | |
496 | ||
497 | uart->ustcnt = 0; /* All off! */ | |
498 | if (!(info->flags & S_INITIALIZED)) | |
499 | return; | |
500 | ||
727dda80 | 501 | local_irq_save(flags); |
1da177e4 LT |
502 | |
503 | if (info->xmit_buf) { | |
504 | free_page((unsigned long) info->xmit_buf); | |
505 | info->xmit_buf = 0; | |
506 | } | |
507 | ||
508 | if (info->tty) | |
509 | set_bit(TTY_IO_ERROR, &info->tty->flags); | |
510 | ||
511 | info->flags &= ~S_INITIALIZED; | |
727dda80 | 512 | local_irq_restore(flags); |
1da177e4 LT |
513 | } |
514 | ||
515 | struct { | |
516 | int divisor, prescale; | |
517 | } | |
518 | #ifndef CONFIG_M68VZ328 | |
519 | hw_baud_table[18] = { | |
520 | {0,0}, /* 0 */ | |
521 | {0,0}, /* 50 */ | |
522 | {0,0}, /* 75 */ | |
523 | {0,0}, /* 110 */ | |
524 | {0,0}, /* 134 */ | |
525 | {0,0}, /* 150 */ | |
526 | {0,0}, /* 200 */ | |
527 | {7,0x26}, /* 300 */ | |
528 | {6,0x26}, /* 600 */ | |
529 | {5,0x26}, /* 1200 */ | |
530 | {0,0}, /* 1800 */ | |
531 | {4,0x26}, /* 2400 */ | |
532 | {3,0x26}, /* 4800 */ | |
533 | {2,0x26}, /* 9600 */ | |
534 | {1,0x26}, /* 19200 */ | |
535 | {0,0x26}, /* 38400 */ | |
536 | {1,0x38}, /* 57600 */ | |
537 | {0,0x38}, /* 115200 */ | |
538 | }; | |
539 | #else | |
540 | hw_baud_table[18] = { | |
541 | {0,0}, /* 0 */ | |
542 | {0,0}, /* 50 */ | |
543 | {0,0}, /* 75 */ | |
544 | {0,0}, /* 110 */ | |
545 | {0,0}, /* 134 */ | |
546 | {0,0}, /* 150 */ | |
547 | {0,0}, /* 200 */ | |
548 | {0,0}, /* 300 */ | |
549 | {7,0x26}, /* 600 */ | |
550 | {6,0x26}, /* 1200 */ | |
551 | {0,0}, /* 1800 */ | |
552 | {5,0x26}, /* 2400 */ | |
553 | {4,0x26}, /* 4800 */ | |
554 | {3,0x26}, /* 9600 */ | |
555 | {2,0x26}, /* 19200 */ | |
556 | {1,0x26}, /* 38400 */ | |
557 | {0,0x26}, /* 57600 */ | |
558 | {1,0x38}, /* 115200 */ | |
559 | }; | |
560 | #endif | |
561 | /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */ | |
562 | ||
563 | /* | |
564 | * This routine is called to set the UART divisor registers to match | |
565 | * the specified baud rate for a serial port. | |
566 | */ | |
567 | static void change_speed(struct m68k_serial *info) | |
568 | { | |
569 | m68328_uart *uart = &uart_addr[info->line]; | |
570 | unsigned short port; | |
571 | unsigned short ustcnt; | |
572 | unsigned cflag; | |
573 | int i; | |
574 | ||
575 | if (!info->tty || !info->tty->termios) | |
576 | return; | |
577 | cflag = info->tty->termios->c_cflag; | |
578 | if (!(port = info->port)) | |
579 | return; | |
580 | ||
581 | ustcnt = uart->ustcnt; | |
582 | uart->ustcnt = ustcnt & ~USTCNT_TXEN; | |
583 | ||
584 | i = cflag & CBAUD; | |
585 | if (i & CBAUDEX) { | |
586 | i = (i & ~CBAUDEX) + B38400; | |
587 | } | |
588 | ||
589 | info->baud = baud_table[i]; | |
590 | uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
591 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
592 | ||
593 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
594 | ||
595 | if ((cflag & CSIZE) == CS8) | |
596 | ustcnt |= USTCNT_8_7; | |
597 | ||
598 | if (cflag & CSTOPB) | |
599 | ustcnt |= USTCNT_STOP; | |
600 | ||
601 | if (cflag & PARENB) | |
602 | ustcnt |= USTCNT_PARITYEN; | |
603 | if (cflag & PARODD) | |
604 | ustcnt |= USTCNT_ODD_EVEN; | |
605 | ||
606 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
607 | if (cflag & CRTSCTS) { | |
608 | uart->utx.w &= ~ UTX_NOCTS; | |
609 | } else { | |
610 | uart->utx.w |= UTX_NOCTS; | |
611 | } | |
612 | #endif | |
613 | ||
614 | ustcnt |= USTCNT_TXEN; | |
615 | ||
616 | uart->ustcnt = ustcnt; | |
617 | return; | |
618 | } | |
619 | ||
620 | /* | |
621 | * Fair output driver allows a process to speak. | |
622 | */ | |
623 | static void rs_fair_output(void) | |
624 | { | |
625 | int left; /* Output no more than that */ | |
626 | unsigned long flags; | |
627 | struct m68k_serial *info = &m68k_soft[0]; | |
628 | char c; | |
629 | ||
630 | if (info == 0) return; | |
631 | if (info->xmit_buf == 0) return; | |
632 | ||
727dda80 | 633 | local_irq_save(flags); |
1da177e4 LT |
634 | left = info->xmit_cnt; |
635 | while (left != 0) { | |
636 | c = info->xmit_buf[info->xmit_tail]; | |
637 | info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1); | |
638 | info->xmit_cnt--; | |
727dda80 | 639 | local_irq_restore(flags); |
1da177e4 LT |
640 | |
641 | rs_put_char(c); | |
642 | ||
727dda80 | 643 | local_irq_save(flags); |
1da177e4 LT |
644 | left = min(info->xmit_cnt, left-1); |
645 | } | |
646 | ||
647 | /* Last character is being transmitted now (hopefully). */ | |
648 | udelay(5); | |
649 | ||
727dda80 | 650 | local_irq_restore(flags); |
1da177e4 LT |
651 | return; |
652 | } | |
653 | ||
654 | /* | |
655 | * m68k_console_print is registered for printk. | |
656 | */ | |
657 | void console_print_68328(const char *p) | |
658 | { | |
659 | char c; | |
660 | ||
661 | while((c=*(p++)) != 0) { | |
662 | if(c == '\n') | |
663 | rs_put_char('\r'); | |
664 | rs_put_char(c); | |
665 | } | |
666 | ||
667 | /* Comment this if you want to have a strict interrupt-driven output */ | |
668 | rs_fair_output(); | |
669 | ||
670 | return; | |
671 | } | |
672 | ||
673 | static void rs_set_ldisc(struct tty_struct *tty) | |
674 | { | |
675 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
676 | ||
677 | if (serial_paranoia_check(info, tty->name, "rs_set_ldisc")) | |
678 | return; | |
679 | ||
680 | info->is_cons = (tty->termios->c_line == N_TTY); | |
681 | ||
682 | printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off"); | |
683 | } | |
684 | ||
685 | static void rs_flush_chars(struct tty_struct *tty) | |
686 | { | |
687 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
688 | m68328_uart *uart = &uart_addr[info->line]; | |
689 | unsigned long flags; | |
690 | ||
691 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) | |
692 | return; | |
693 | #ifndef USE_INTS | |
694 | for(;;) { | |
695 | #endif | |
696 | ||
697 | /* Enable transmitter */ | |
727dda80 | 698 | local_irq_save(flags); |
1da177e4 LT |
699 | |
700 | if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || | |
701 | !info->xmit_buf) { | |
727dda80 | 702 | local_irq_restore(flags); |
1da177e4 LT |
703 | return; |
704 | } | |
705 | ||
706 | #ifdef USE_INTS | |
707 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
708 | #else | |
709 | uart->ustcnt |= USTCNT_TXEN; | |
710 | #endif | |
711 | ||
712 | #ifdef USE_INTS | |
713 | if (uart->utx.w & UTX_TX_AVAIL) { | |
714 | #else | |
715 | if (1) { | |
716 | #endif | |
717 | /* Send char */ | |
718 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
719 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
720 | info->xmit_cnt--; | |
721 | } | |
722 | ||
723 | #ifndef USE_INTS | |
724 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
725 | } | |
726 | #endif | |
727dda80 | 727 | local_irq_restore(flags); |
1da177e4 LT |
728 | } |
729 | ||
730 | extern void console_printn(const char * b, int count); | |
731 | ||
732 | static int rs_write(struct tty_struct * tty, | |
733 | const unsigned char *buf, int count) | |
734 | { | |
735 | int c, total = 0; | |
736 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
737 | m68328_uart *uart = &uart_addr[info->line]; | |
738 | unsigned long flags; | |
739 | ||
740 | if (serial_paranoia_check(info, tty->name, "rs_write")) | |
741 | return 0; | |
742 | ||
743 | if (!tty || !info->xmit_buf) | |
744 | return 0; | |
745 | ||
727dda80 | 746 | local_save_flags(flags); |
1da177e4 | 747 | while (1) { |
727dda80 | 748 | local_irq_disable(); |
1da177e4 LT |
749 | c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, |
750 | SERIAL_XMIT_SIZE - info->xmit_head)); | |
727dda80 GU |
751 | local_irq_restore(flags); |
752 | ||
1da177e4 LT |
753 | if (c <= 0) |
754 | break; | |
755 | ||
756 | memcpy(info->xmit_buf + info->xmit_head, buf, c); | |
727dda80 GU |
757 | |
758 | local_irq_disable(); | |
1da177e4 LT |
759 | info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); |
760 | info->xmit_cnt += c; | |
727dda80 | 761 | local_irq_restore(flags); |
1da177e4 LT |
762 | buf += c; |
763 | count -= c; | |
764 | total += c; | |
765 | } | |
766 | ||
767 | if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) { | |
768 | /* Enable transmitter */ | |
727dda80 | 769 | local_irq_disable(); |
1da177e4 LT |
770 | #ifndef USE_INTS |
771 | while(info->xmit_cnt) { | |
772 | #endif | |
773 | ||
774 | uart->ustcnt |= USTCNT_TXEN; | |
775 | #ifdef USE_INTS | |
776 | uart->ustcnt |= USTCNT_TX_INTR_MASK; | |
777 | #else | |
778 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
779 | #endif | |
780 | if (uart->utx.w & UTX_TX_AVAIL) { | |
781 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
782 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
783 | info->xmit_cnt--; | |
784 | } | |
785 | ||
786 | #ifndef USE_INTS | |
787 | } | |
788 | #endif | |
727dda80 | 789 | local_irq_restore(flags); |
1da177e4 | 790 | } |
727dda80 | 791 | |
1da177e4 LT |
792 | return total; |
793 | } | |
794 | ||
795 | static int rs_write_room(struct tty_struct *tty) | |
796 | { | |
797 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
798 | int ret; | |
799 | ||
800 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) | |
801 | return 0; | |
802 | ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; | |
803 | if (ret < 0) | |
804 | ret = 0; | |
805 | return ret; | |
806 | } | |
807 | ||
808 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
809 | { | |
810 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
811 | ||
812 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) | |
813 | return 0; | |
814 | return info->xmit_cnt; | |
815 | } | |
816 | ||
817 | static void rs_flush_buffer(struct tty_struct *tty) | |
818 | { | |
819 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
727dda80 | 820 | unsigned long flags; |
1da177e4 LT |
821 | |
822 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) | |
823 | return; | |
727dda80 | 824 | local_irq_save(flags); |
1da177e4 | 825 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
727dda80 | 826 | local_irq_restore(flags); |
1da177e4 LT |
827 | tty_wakeup(tty); |
828 | } | |
829 | ||
830 | /* | |
831 | * ------------------------------------------------------------ | |
832 | * rs_throttle() | |
833 | * | |
834 | * This routine is called by the upper-layer tty layer to signal that | |
835 | * incoming characters should be throttled. | |
836 | * ------------------------------------------------------------ | |
837 | */ | |
838 | static void rs_throttle(struct tty_struct * tty) | |
839 | { | |
840 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
841 | ||
842 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) | |
843 | return; | |
844 | ||
845 | if (I_IXOFF(tty)) | |
846 | info->x_char = STOP_CHAR(tty); | |
847 | ||
848 | /* Turn off RTS line (do this atomic) */ | |
849 | } | |
850 | ||
851 | static void rs_unthrottle(struct tty_struct * tty) | |
852 | { | |
853 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
854 | ||
855 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) | |
856 | return; | |
857 | ||
858 | if (I_IXOFF(tty)) { | |
859 | if (info->x_char) | |
860 | info->x_char = 0; | |
861 | else | |
862 | info->x_char = START_CHAR(tty); | |
863 | } | |
864 | ||
865 | /* Assert RTS line (do this atomic) */ | |
866 | } | |
867 | ||
868 | /* | |
869 | * ------------------------------------------------------------ | |
870 | * rs_ioctl() and friends | |
871 | * ------------------------------------------------------------ | |
872 | */ | |
873 | ||
874 | static int get_serial_info(struct m68k_serial * info, | |
875 | struct serial_struct * retinfo) | |
876 | { | |
877 | struct serial_struct tmp; | |
878 | ||
879 | if (!retinfo) | |
880 | return -EFAULT; | |
881 | memset(&tmp, 0, sizeof(tmp)); | |
882 | tmp.type = info->type; | |
883 | tmp.line = info->line; | |
884 | tmp.port = info->port; | |
885 | tmp.irq = info->irq; | |
886 | tmp.flags = info->flags; | |
887 | tmp.baud_base = info->baud_base; | |
888 | tmp.close_delay = info->close_delay; | |
889 | tmp.closing_wait = info->closing_wait; | |
890 | tmp.custom_divisor = info->custom_divisor; | |
891 | copy_to_user(retinfo,&tmp,sizeof(*retinfo)); | |
892 | return 0; | |
893 | } | |
894 | ||
895 | static int set_serial_info(struct m68k_serial * info, | |
896 | struct serial_struct * new_info) | |
897 | { | |
898 | struct serial_struct new_serial; | |
899 | struct m68k_serial old_info; | |
900 | int retval = 0; | |
901 | ||
902 | if (!new_info) | |
903 | return -EFAULT; | |
904 | copy_from_user(&new_serial,new_info,sizeof(new_serial)); | |
905 | old_info = *info; | |
906 | ||
907 | if (!capable(CAP_SYS_ADMIN)) { | |
908 | if ((new_serial.baud_base != info->baud_base) || | |
909 | (new_serial.type != info->type) || | |
910 | (new_serial.close_delay != info->close_delay) || | |
911 | ((new_serial.flags & ~S_USR_MASK) != | |
912 | (info->flags & ~S_USR_MASK))) | |
913 | return -EPERM; | |
914 | info->flags = ((info->flags & ~S_USR_MASK) | | |
915 | (new_serial.flags & S_USR_MASK)); | |
916 | info->custom_divisor = new_serial.custom_divisor; | |
917 | goto check_and_exit; | |
918 | } | |
919 | ||
920 | if (info->count > 1) | |
921 | return -EBUSY; | |
922 | ||
923 | /* | |
924 | * OK, past this point, all the error checking has been done. | |
925 | * At this point, we start making changes..... | |
926 | */ | |
927 | ||
928 | info->baud_base = new_serial.baud_base; | |
929 | info->flags = ((info->flags & ~S_FLAGS) | | |
930 | (new_serial.flags & S_FLAGS)); | |
931 | info->type = new_serial.type; | |
932 | info->close_delay = new_serial.close_delay; | |
933 | info->closing_wait = new_serial.closing_wait; | |
934 | ||
935 | check_and_exit: | |
936 | retval = startup(info); | |
937 | return retval; | |
938 | } | |
939 | ||
940 | /* | |
941 | * get_lsr_info - get line status register info | |
942 | * | |
943 | * Purpose: Let user call ioctl() to get info when the UART physically | |
944 | * is emptied. On bus types like RS485, the transmitter must | |
945 | * release the bus after transmitting. This must be done when | |
946 | * the transmit shift register is empty, not be done when the | |
947 | * transmit holding register is empty. This functionality | |
948 | * allows an RS485 driver to be written in user space. | |
949 | */ | |
950 | static int get_lsr_info(struct m68k_serial * info, unsigned int *value) | |
951 | { | |
952 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
953 | m68328_uart *uart = &uart_addr[info->line]; | |
954 | #endif | |
955 | unsigned char status; | |
727dda80 | 956 | unsigned long flags; |
1da177e4 | 957 | |
727dda80 | 958 | local_irq_save(flags); |
1da177e4 LT |
959 | #ifdef CONFIG_SERIAL_68328_RTS_CTS |
960 | status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0; | |
961 | #else | |
962 | status = 0; | |
963 | #endif | |
727dda80 | 964 | local_irq_restore(flags); |
1da177e4 LT |
965 | put_user(status,value); |
966 | return 0; | |
967 | } | |
968 | ||
969 | /* | |
970 | * This routine sends a break character out the serial port. | |
971 | */ | |
6a72c7ba | 972 | static void send_break(struct m68k_serial * info, unsigned int duration) |
1da177e4 LT |
973 | { |
974 | m68328_uart *uart = &uart_addr[info->line]; | |
975 | unsigned long flags; | |
976 | if (!info->port) | |
977 | return; | |
727dda80 | 978 | local_irq_save(flags); |
1da177e4 LT |
979 | #ifdef USE_INTS |
980 | uart->utx.w |= UTX_SEND_BREAK; | |
6a72c7ba | 981 | msleep_interruptible(duration); |
1da177e4 LT |
982 | uart->utx.w &= ~UTX_SEND_BREAK; |
983 | #endif | |
727dda80 | 984 | local_irq_restore(flags); |
1da177e4 LT |
985 | } |
986 | ||
987 | static int rs_ioctl(struct tty_struct *tty, struct file * file, | |
988 | unsigned int cmd, unsigned long arg) | |
989 | { | |
990 | int error; | |
991 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
992 | int retval; | |
993 | ||
994 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
995 | return -ENODEV; | |
996 | ||
997 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
998 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && | |
999 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { | |
1000 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1001 | return -EIO; | |
1002 | } | |
1003 | ||
1004 | switch (cmd) { | |
1005 | case TCSBRK: /* SVID version: non-zero arg --> no break */ | |
1006 | retval = tty_check_change(tty); | |
1007 | if (retval) | |
1008 | return retval; | |
1009 | tty_wait_until_sent(tty, 0); | |
1010 | if (!arg) | |
6a72c7ba | 1011 | send_break(info, 250); /* 1/4 second */ |
1da177e4 LT |
1012 | return 0; |
1013 | case TCSBRKP: /* support for POSIX tcsendbreak() */ | |
1014 | retval = tty_check_change(tty); | |
1015 | if (retval) | |
1016 | return retval; | |
1017 | tty_wait_until_sent(tty, 0); | |
6a72c7ba | 1018 | send_break(info, arg ? arg*(100) : 250); |
1da177e4 | 1019 | return 0; |
1da177e4 LT |
1020 | case TIOCGSERIAL: |
1021 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
1022 | sizeof(struct serial_struct))) | |
1023 | return get_serial_info(info, | |
1024 | (struct serial_struct *) arg); | |
1025 | return -EFAULT; | |
1026 | case TIOCSSERIAL: | |
1027 | return set_serial_info(info, | |
1028 | (struct serial_struct *) arg); | |
1029 | case TIOCSERGETLSR: /* Get line status register */ | |
1030 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
727dda80 | 1031 | sizeof(unsigned int))) |
1da177e4 LT |
1032 | return get_lsr_info(info, (unsigned int *) arg); |
1033 | return -EFAULT; | |
1034 | case TIOCSERGSTRUCT: | |
1035 | if (!access_ok(VERIFY_WRITE, (void *) arg, | |
1036 | sizeof(struct m68k_serial))) | |
1037 | return -EFAULT; | |
1038 | copy_to_user((struct m68k_serial *) arg, | |
1039 | info, sizeof(struct m68k_serial)); | |
1040 | return 0; | |
1041 | ||
1042 | default: | |
1043 | return -ENOIOCTLCMD; | |
1044 | } | |
1045 | return 0; | |
1046 | } | |
1047 | ||
606d099c | 1048 | static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
1da177e4 LT |
1049 | { |
1050 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
1051 | ||
1da177e4 LT |
1052 | change_speed(info); |
1053 | ||
1054 | if ((old_termios->c_cflag & CRTSCTS) && | |
1055 | !(tty->termios->c_cflag & CRTSCTS)) { | |
1056 | tty->hw_stopped = 0; | |
1057 | rs_start(tty); | |
1058 | } | |
1059 | ||
1060 | } | |
1061 | ||
1062 | /* | |
1063 | * ------------------------------------------------------------ | |
1064 | * rs_close() | |
1065 | * | |
1066 | * This routine is called when the serial port gets closed. First, we | |
1067 | * wait for the last remaining data to be sent. Then, we unlink its | |
1068 | * S structure from the interrupt chain if necessary, and we free | |
1069 | * that IRQ if nothing is left in the chain. | |
1070 | * ------------------------------------------------------------ | |
1071 | */ | |
1072 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
1073 | { | |
1074 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1075 | m68328_uart *uart = &uart_addr[info->line]; | |
1076 | unsigned long flags; | |
1077 | ||
1078 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) | |
1079 | return; | |
1080 | ||
727dda80 | 1081 | local_irq_save(flags); |
1da177e4 LT |
1082 | |
1083 | if (tty_hung_up_p(filp)) { | |
727dda80 | 1084 | local_irq_restore(flags); |
1da177e4 LT |
1085 | return; |
1086 | } | |
1087 | ||
1088 | if ((tty->count == 1) && (info->count != 1)) { | |
1089 | /* | |
1090 | * Uh, oh. tty->count is 1, which means that the tty | |
1091 | * structure will be freed. Info->count should always | |
1092 | * be one in these conditions. If it's greater than | |
1093 | * one, we've got real problems, since it means the | |
1094 | * serial port won't be shutdown. | |
1095 | */ | |
1096 | printk("rs_close: bad serial port count; tty->count is 1, " | |
1097 | "info->count is %d\n", info->count); | |
1098 | info->count = 1; | |
1099 | } | |
1100 | if (--info->count < 0) { | |
1101 | printk("rs_close: bad serial port count for ttyS%d: %d\n", | |
1102 | info->line, info->count); | |
1103 | info->count = 0; | |
1104 | } | |
1105 | if (info->count) { | |
727dda80 | 1106 | local_irq_restore(flags); |
1da177e4 LT |
1107 | return; |
1108 | } | |
1109 | info->flags |= S_CLOSING; | |
1110 | /* | |
1111 | * Now we wait for the transmit buffer to clear; and we notify | |
1112 | * the line discipline to only process XON/XOFF characters. | |
1113 | */ | |
1114 | tty->closing = 1; | |
1115 | if (info->closing_wait != S_CLOSING_WAIT_NONE) | |
1116 | tty_wait_until_sent(tty, info->closing_wait); | |
1117 | /* | |
1118 | * At this point we stop accepting input. To do this, we | |
1119 | * disable the receive line status interrupts, and tell the | |
1120 | * interrupt driver to stop checking the data ready bit in the | |
1121 | * line status register. | |
1122 | */ | |
1123 | ||
1124 | uart->ustcnt &= ~USTCNT_RXEN; | |
1125 | uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK); | |
1126 | ||
1127 | shutdown(info); | |
978e595f | 1128 | rs_flush_buffer(tty); |
1da177e4 LT |
1129 | |
1130 | tty_ldisc_flush(tty); | |
1131 | tty->closing = 0; | |
1132 | info->event = 0; | |
1133 | info->tty = 0; | |
1134 | #warning "This is not and has never been valid so fix it" | |
1135 | #if 0 | |
1136 | if (tty->ldisc.num != ldiscs[N_TTY].num) { | |
1137 | if (tty->ldisc.close) | |
1138 | (tty->ldisc.close)(tty); | |
1139 | tty->ldisc = ldiscs[N_TTY]; | |
1140 | tty->termios->c_line = N_TTY; | |
1141 | if (tty->ldisc.open) | |
1142 | (tty->ldisc.open)(tty); | |
1143 | } | |
1144 | #endif | |
1145 | if (info->blocked_open) { | |
1146 | if (info->close_delay) { | |
1147 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); | |
1148 | } | |
1149 | wake_up_interruptible(&info->open_wait); | |
1150 | } | |
1151 | info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING); | |
1152 | wake_up_interruptible(&info->close_wait); | |
727dda80 | 1153 | local_irq_restore(flags); |
1da177e4 LT |
1154 | } |
1155 | ||
1156 | /* | |
1157 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
1158 | */ | |
1159 | void rs_hangup(struct tty_struct *tty) | |
1160 | { | |
1161 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1162 | ||
1163 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) | |
1164 | return; | |
1165 | ||
1166 | rs_flush_buffer(tty); | |
1167 | shutdown(info); | |
1168 | info->event = 0; | |
1169 | info->count = 0; | |
1170 | info->flags &= ~S_NORMAL_ACTIVE; | |
1171 | info->tty = 0; | |
1172 | wake_up_interruptible(&info->open_wait); | |
1173 | } | |
1174 | ||
1175 | /* | |
1176 | * ------------------------------------------------------------ | |
1177 | * rs_open() and friends | |
1178 | * ------------------------------------------------------------ | |
1179 | */ | |
1180 | static int block_til_ready(struct tty_struct *tty, struct file * filp, | |
1181 | struct m68k_serial *info) | |
1182 | { | |
1183 | DECLARE_WAITQUEUE(wait, current); | |
1184 | int retval; | |
1185 | int do_clocal = 0; | |
1186 | ||
1187 | /* | |
1188 | * If the device is in the middle of being closed, then block | |
1189 | * until it's done, and then try again. | |
1190 | */ | |
1191 | if (info->flags & S_CLOSING) { | |
1192 | interruptible_sleep_on(&info->close_wait); | |
1193 | #ifdef SERIAL_DO_RESTART | |
1194 | if (info->flags & S_HUP_NOTIFY) | |
1195 | return -EAGAIN; | |
1196 | else | |
1197 | return -ERESTARTSYS; | |
1198 | #else | |
1199 | return -EAGAIN; | |
1200 | #endif | |
1201 | } | |
1202 | ||
1203 | /* | |
1204 | * If non-blocking mode is set, or the port is not enabled, | |
1205 | * then make the check up front and then exit. | |
1206 | */ | |
1207 | if ((filp->f_flags & O_NONBLOCK) || | |
1208 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
1209 | info->flags |= S_NORMAL_ACTIVE; | |
1210 | return 0; | |
1211 | } | |
1212 | ||
1213 | if (tty->termios->c_cflag & CLOCAL) | |
1214 | do_clocal = 1; | |
1215 | ||
1216 | /* | |
1217 | * Block waiting for the carrier detect and the line to become | |
1218 | * free (i.e., not in use by the callout). While we are in | |
1219 | * this loop, info->count is dropped by one, so that | |
1220 | * rs_close() knows when to free things. We restore it upon | |
1221 | * exit, either normal or abnormal. | |
1222 | */ | |
1223 | retval = 0; | |
1224 | add_wait_queue(&info->open_wait, &wait); | |
1225 | ||
1226 | info->count--; | |
1227 | info->blocked_open++; | |
1228 | while (1) { | |
727dda80 | 1229 | local_irq_disable(); |
1da177e4 | 1230 | m68k_rtsdtr(info, 1); |
727dda80 | 1231 | local_irq_enable(); |
1da177e4 LT |
1232 | current->state = TASK_INTERRUPTIBLE; |
1233 | if (tty_hung_up_p(filp) || | |
1234 | !(info->flags & S_INITIALIZED)) { | |
1235 | #ifdef SERIAL_DO_RESTART | |
1236 | if (info->flags & S_HUP_NOTIFY) | |
1237 | retval = -EAGAIN; | |
1238 | else | |
1239 | retval = -ERESTARTSYS; | |
1240 | #else | |
1241 | retval = -EAGAIN; | |
1242 | #endif | |
1243 | break; | |
1244 | } | |
1245 | if (!(info->flags & S_CLOSING) && do_clocal) | |
1246 | break; | |
1247 | if (signal_pending(current)) { | |
1248 | retval = -ERESTARTSYS; | |
1249 | break; | |
1250 | } | |
1251 | schedule(); | |
1252 | } | |
1253 | current->state = TASK_RUNNING; | |
1254 | remove_wait_queue(&info->open_wait, &wait); | |
1255 | if (!tty_hung_up_p(filp)) | |
1256 | info->count++; | |
1257 | info->blocked_open--; | |
1258 | ||
1259 | if (retval) | |
1260 | return retval; | |
1261 | info->flags |= S_NORMAL_ACTIVE; | |
1262 | return 0; | |
1263 | } | |
1264 | ||
1265 | /* | |
1266 | * This routine is called whenever a serial port is opened. It | |
1267 | * enables interrupts for a serial port, linking in its S structure into | |
1268 | * the IRQ chain. It also performs the serial-specific | |
1269 | * initialization for the tty structure. | |
1270 | */ | |
1271 | int rs_open(struct tty_struct *tty, struct file * filp) | |
1272 | { | |
1273 | struct m68k_serial *info; | |
1274 | int retval, line; | |
1275 | ||
1276 | line = tty->index; | |
1277 | ||
1278 | if (line >= NR_PORTS || line < 0) /* we have exactly one */ | |
1279 | return -ENODEV; | |
1280 | ||
1281 | info = &m68k_soft[line]; | |
1282 | ||
1283 | if (serial_paranoia_check(info, tty->name, "rs_open")) | |
1284 | return -ENODEV; | |
1285 | ||
1286 | info->count++; | |
1287 | tty->driver_data = info; | |
1288 | info->tty = tty; | |
1289 | ||
1290 | /* | |
1291 | * Start up serial port | |
1292 | */ | |
1293 | retval = startup(info); | |
1294 | if (retval) | |
1295 | return retval; | |
1296 | ||
1297 | return block_til_ready(tty, filp, info); | |
1298 | } | |
1299 | ||
1300 | /* Finally, routines used to initialize the serial driver. */ | |
1301 | ||
1302 | static void show_serial_version(void) | |
1303 | { | |
1304 | printk("MC68328 serial driver version 1.00\n"); | |
1305 | } | |
1306 | ||
b68e31d0 | 1307 | static const struct tty_operations rs_ops = { |
1da177e4 LT |
1308 | .open = rs_open, |
1309 | .close = rs_close, | |
1310 | .write = rs_write, | |
1311 | .flush_chars = rs_flush_chars, | |
1312 | .write_room = rs_write_room, | |
1313 | .chars_in_buffer = rs_chars_in_buffer, | |
1314 | .flush_buffer = rs_flush_buffer, | |
1315 | .ioctl = rs_ioctl, | |
1316 | .throttle = rs_throttle, | |
1317 | .unthrottle = rs_unthrottle, | |
1318 | .set_termios = rs_set_termios, | |
1319 | .stop = rs_stop, | |
1320 | .start = rs_start, | |
1321 | .hangup = rs_hangup, | |
1322 | .set_ldisc = rs_set_ldisc, | |
1323 | }; | |
1324 | ||
1325 | /* rs_init inits the driver */ | |
1326 | static int __init | |
1327 | rs68328_init(void) | |
1328 | { | |
1329 | int flags, i; | |
1330 | struct m68k_serial *info; | |
1331 | ||
1332 | serial_driver = alloc_tty_driver(NR_PORTS); | |
1333 | if (!serial_driver) | |
1334 | return -ENOMEM; | |
1335 | ||
1336 | show_serial_version(); | |
1337 | ||
1338 | /* Initialize the tty_driver structure */ | |
1339 | /* SPARC: Not all of this is exactly right for us. */ | |
1340 | ||
1341 | serial_driver->name = "ttyS"; | |
1342 | serial_driver->major = TTY_MAJOR; | |
1343 | serial_driver->minor_start = 64; | |
1344 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
1345 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
1346 | serial_driver->init_termios = tty_std_termios; | |
1347 | serial_driver->init_termios.c_cflag = | |
1348 | m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL; | |
1349 | serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
1350 | tty_set_operations(serial_driver, &rs_ops); | |
1351 | ||
1352 | if (tty_register_driver(serial_driver)) { | |
1353 | put_tty_driver(serial_driver); | |
1354 | printk(KERN_ERR "Couldn't register serial driver\n"); | |
1355 | return -ENOMEM; | |
1356 | } | |
1357 | ||
727dda80 | 1358 | local_irq_save(flags); |
1da177e4 LT |
1359 | |
1360 | for(i=0;i<NR_PORTS;i++) { | |
1361 | ||
1362 | info = &m68k_soft[i]; | |
1363 | info->magic = SERIAL_MAGIC; | |
1364 | info->port = (int) &uart_addr[i]; | |
1365 | info->tty = 0; | |
1366 | info->irq = uart_irqs[i]; | |
1367 | info->custom_divisor = 16; | |
1368 | info->close_delay = 50; | |
1369 | info->closing_wait = 3000; | |
1370 | info->x_char = 0; | |
1371 | info->event = 0; | |
1372 | info->count = 0; | |
1373 | info->blocked_open = 0; | |
931f9cde GU |
1374 | INIT_WORK(&info->tqueue, do_softint); |
1375 | INIT_WORK(&info->tqueue_hangup, do_serial_hangup); | |
1da177e4 LT |
1376 | init_waitqueue_head(&info->open_wait); |
1377 | init_waitqueue_head(&info->close_wait); | |
1378 | info->line = i; | |
1379 | info->is_cons = 1; /* Means shortcuts work */ | |
1380 | ||
1381 | printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line, | |
1382 | info->port, info->irq); | |
1383 | printk(" is a builtin MC68328 UART\n"); | |
1384 | ||
1385 | IRQ_ports[info->irq] = info; /* waste of space */ | |
1386 | ||
1387 | #ifdef CONFIG_M68VZ328 | |
1388 | if (i > 0 ) | |
1389 | PJSEL &= 0xCF; /* PSW enable second port output */ | |
1390 | #endif | |
1391 | ||
1392 | if (request_irq(uart_irqs[i], | |
1393 | rs_interrupt, | |
7c74806b | 1394 | IRQF_DISABLED, |
1da177e4 LT |
1395 | "M68328_UART", NULL)) |
1396 | panic("Unable to attach 68328 serial interrupt\n"); | |
1da177e4 | 1397 | } |
727dda80 | 1398 | local_irq_restore(flags); |
1da177e4 LT |
1399 | return 0; |
1400 | } | |
1401 | ||
1da177e4 LT |
1402 | module_init(rs68328_init); |
1403 | ||
1404 | ||
1405 | ||
1406 | static void m68328_set_baud(void) | |
1407 | { | |
1408 | unsigned short ustcnt; | |
1409 | int i; | |
1410 | ||
1411 | ustcnt = USTCNT; | |
1412 | USTCNT = ustcnt & ~USTCNT_TXEN; | |
1413 | ||
1414 | again: | |
1415 | for (i = 0; i < sizeof(baud_table) / sizeof(baud_table[0]); i++) | |
1416 | if (baud_table[i] == m68328_console_baud) | |
1417 | break; | |
1418 | if (i >= sizeof(baud_table) / sizeof(baud_table[0])) { | |
1419 | m68328_console_baud = 9600; | |
1420 | goto again; | |
1421 | } | |
1422 | ||
1423 | UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
1424 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
1425 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
1426 | ustcnt |= USTCNT_8_7; | |
1427 | ustcnt |= USTCNT_TXEN; | |
1428 | USTCNT = ustcnt; | |
1429 | m68328_console_initted = 1; | |
1430 | return; | |
1431 | } | |
1432 | ||
1433 | ||
1434 | int m68328_console_setup(struct console *cp, char *arg) | |
1435 | { | |
1436 | int i, n = CONSOLE_BAUD_RATE; | |
1437 | ||
1438 | if (!cp) | |
1439 | return(-1); | |
1440 | ||
1441 | if (arg) | |
1442 | n = simple_strtoul(arg,NULL,0); | |
1443 | ||
1444 | for (i = 0; i < BAUD_TABLE_SIZE; i++) | |
1445 | if (baud_table[i] == n) | |
1446 | break; | |
1447 | if (i < BAUD_TABLE_SIZE) { | |
1448 | m68328_console_baud = n; | |
1449 | m68328_console_cbaud = 0; | |
1450 | if (i > 15) { | |
1451 | m68328_console_cbaud |= CBAUDEX; | |
1452 | i -= 15; | |
1453 | } | |
1454 | m68328_console_cbaud |= i; | |
1455 | } | |
1456 | ||
1457 | m68328_set_baud(); /* make sure baud rate changes */ | |
1458 | return(0); | |
1459 | } | |
1460 | ||
1461 | ||
1462 | static struct tty_driver *m68328_console_device(struct console *c, int *index) | |
1463 | { | |
1464 | *index = c->index; | |
1465 | return serial_driver; | |
1466 | } | |
1467 | ||
1468 | ||
1469 | void m68328_console_write (struct console *co, const char *str, | |
1470 | unsigned int count) | |
1471 | { | |
1472 | if (!m68328_console_initted) | |
1473 | m68328_set_baud(); | |
1474 | while (count--) { | |
1475 | if (*str == '\n') | |
1476 | rs_put_char('\r'); | |
1477 | rs_put_char( *str++ ); | |
1478 | } | |
1479 | } | |
1480 | ||
1481 | ||
1482 | static struct console m68328_driver = { | |
1483 | .name = "ttyS", | |
1484 | .write = m68328_console_write, | |
1485 | .device = m68328_console_device, | |
1486 | .setup = m68328_console_setup, | |
1487 | .flags = CON_PRINTBUFFER, | |
1488 | .index = -1, | |
1489 | }; | |
1490 | ||
1491 | ||
1492 | static int __init m68328_console_init(void) | |
1493 | { | |
1494 | register_console(&m68328_driver); | |
1495 | return 0; | |
1496 | } | |
1497 | ||
1498 | console_initcall(m68328_console_init); |