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 | ||
87 | /* serial subtype definitions */ | |
88 | #define SERIAL_TYPE_NORMAL 1 | |
89 | ||
90 | /* number of characters left in xmit buffer before we ask for more */ | |
91 | #define WAKEUP_CHARS 256 | |
92 | ||
93 | /* Debugging... DEBUG_INTR is bad to use when one of the zs | |
94 | * lines is your console ;( | |
95 | */ | |
96 | #undef SERIAL_DEBUG_INTR | |
97 | #undef SERIAL_DEBUG_OPEN | |
98 | #undef SERIAL_DEBUG_FLOW | |
99 | ||
100 | #define RS_ISR_PASS_LIMIT 256 | |
101 | ||
1da177e4 LT |
102 | static void change_speed(struct m68k_serial *info); |
103 | ||
104 | /* | |
105 | * Setup for console. Argument comes from the boot command line. | |
106 | */ | |
107 | ||
108 | #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ) | |
109 | #define CONSOLE_BAUD_RATE 115200 | |
110 | #define DEFAULT_CBAUD B115200 | |
111 | #else | |
112 | /* (es) */ | |
113 | /* note: this is messy, but it works, again, perhaps defined somewhere else?*/ | |
114 | #ifdef CONFIG_M68VZ328 | |
115 | #define CONSOLE_BAUD_RATE 19200 | |
116 | #define DEFAULT_CBAUD B19200 | |
117 | #endif | |
118 | /* (/es) */ | |
119 | #endif | |
120 | ||
121 | #ifndef CONSOLE_BAUD_RATE | |
122 | #define CONSOLE_BAUD_RATE 9600 | |
123 | #define DEFAULT_CBAUD B9600 | |
124 | #endif | |
125 | ||
126 | ||
127 | static int m68328_console_initted = 0; | |
128 | static int m68328_console_baud = CONSOLE_BAUD_RATE; | |
129 | static int m68328_console_cbaud = DEFAULT_CBAUD; | |
130 | ||
131 | ||
1da177e4 LT |
132 | static inline int serial_paranoia_check(struct m68k_serial *info, |
133 | char *name, const char *routine) | |
134 | { | |
135 | #ifdef SERIAL_PARANOIA_CHECK | |
136 | static const char *badmagic = | |
137 | "Warning: bad magic number for serial struct %s in %s\n"; | |
138 | static const char *badinfo = | |
139 | "Warning: null m68k_serial for %s in %s\n"; | |
140 | ||
141 | if (!info) { | |
142 | printk(badinfo, name, routine); | |
143 | return 1; | |
144 | } | |
145 | if (info->magic != SERIAL_MAGIC) { | |
146 | printk(badmagic, name, routine); | |
147 | return 1; | |
148 | } | |
149 | #endif | |
150 | return 0; | |
151 | } | |
152 | ||
153 | /* | |
154 | * This is used to figure out the divisor speeds and the timeouts | |
155 | */ | |
156 | static int baud_table[] = { | |
157 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, | |
158 | 9600, 19200, 38400, 57600, 115200, 0 }; | |
159 | ||
160 | #define BAUD_TABLE_SIZE (sizeof(baud_table)/sizeof(baud_table[0])) | |
161 | ||
162 | /* Sets or clears DTR/RTS on the requested line */ | |
163 | static inline void m68k_rtsdtr(struct m68k_serial *ss, int set) | |
164 | { | |
165 | if (set) { | |
166 | /* set the RTS/CTS line */ | |
167 | } else { | |
168 | /* clear it */ | |
169 | } | |
170 | return; | |
171 | } | |
172 | ||
173 | /* Utility routines */ | |
174 | static inline int get_baud(struct m68k_serial *ss) | |
175 | { | |
176 | unsigned long result = 115200; | |
177 | unsigned short int baud = uart_addr[ss->line].ubaud; | |
178 | if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400; | |
179 | result >>= GET_FIELD(baud, UBAUD_DIVIDE); | |
180 | ||
181 | return result; | |
182 | } | |
183 | ||
184 | /* | |
185 | * ------------------------------------------------------------ | |
186 | * rs_stop() and rs_start() | |
187 | * | |
188 | * This routines are called before setting or resetting tty->stopped. | |
189 | * They enable or disable transmitter interrupts, as necessary. | |
190 | * ------------------------------------------------------------ | |
191 | */ | |
192 | static void rs_stop(struct tty_struct *tty) | |
193 | { | |
194 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
195 | m68328_uart *uart = &uart_addr[info->line]; | |
196 | unsigned long flags; | |
197 | ||
198 | if (serial_paranoia_check(info, tty->name, "rs_stop")) | |
199 | return; | |
200 | ||
727dda80 | 201 | local_irq_save(flags); |
1da177e4 | 202 | uart->ustcnt &= ~USTCNT_TXEN; |
727dda80 | 203 | local_irq_restore(flags); |
1da177e4 LT |
204 | } |
205 | ||
206 | static void rs_put_char(char ch) | |
207 | { | |
208 | int flags, loops = 0; | |
209 | ||
727dda80 | 210 | local_irq_save(flags); |
1da177e4 LT |
211 | |
212 | while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) { | |
213 | loops++; | |
214 | udelay(5); | |
215 | } | |
216 | ||
217 | UTX_TXDATA = ch; | |
218 | udelay(5); | |
727dda80 | 219 | local_irq_restore(flags); |
1da177e4 LT |
220 | } |
221 | ||
222 | static void rs_start(struct tty_struct *tty) | |
223 | { | |
224 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
225 | m68328_uart *uart = &uart_addr[info->line]; | |
226 | unsigned long flags; | |
227 | ||
228 | if (serial_paranoia_check(info, tty->name, "rs_start")) | |
229 | return; | |
230 | ||
727dda80 | 231 | local_irq_save(flags); |
1da177e4 LT |
232 | if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) { |
233 | #ifdef USE_INTS | |
234 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
235 | #else | |
236 | uart->ustcnt |= USTCNT_TXEN; | |
237 | #endif | |
238 | } | |
727dda80 | 239 | local_irq_restore(flags); |
1da177e4 LT |
240 | } |
241 | ||
242 | /* Drop into either the boot monitor or kadb upon receiving a break | |
243 | * from keyboard/console input. | |
244 | */ | |
245 | static void batten_down_hatches(void) | |
246 | { | |
247 | /* Drop into the debugger */ | |
248 | } | |
249 | ||
41c28ff1 | 250 | static void status_handle(struct m68k_serial *info, unsigned short status) |
1da177e4 LT |
251 | { |
252 | #if 0 | |
253 | if(status & DCD) { | |
254 | if((info->tty->termios->c_cflag & CRTSCTS) && | |
255 | ((info->curregs[3] & AUTO_ENAB)==0)) { | |
256 | info->curregs[3] |= AUTO_ENAB; | |
257 | info->pendregs[3] |= AUTO_ENAB; | |
258 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
259 | } | |
260 | } else { | |
261 | if((info->curregs[3] & AUTO_ENAB)) { | |
262 | info->curregs[3] &= ~AUTO_ENAB; | |
263 | info->pendregs[3] &= ~AUTO_ENAB; | |
264 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
265 | } | |
266 | } | |
267 | #endif | |
268 | /* If this is console input and this is a | |
269 | * 'break asserted' status change interrupt | |
270 | * see if we can drop into the debugger | |
271 | */ | |
272 | if((status & URX_BREAK) && info->break_abort) | |
273 | batten_down_hatches(); | |
274 | return; | |
275 | } | |
276 | ||
7d12e780 | 277 | static void receive_chars(struct m68k_serial *info, unsigned short rx) |
1da177e4 LT |
278 | { |
279 | struct tty_struct *tty = info->tty; | |
280 | m68328_uart *uart = &uart_addr[info->line]; | |
33f0f88f | 281 | unsigned char ch, flag; |
1da177e4 LT |
282 | |
283 | /* | |
284 | * This do { } while() loop will get ALL chars out of Rx FIFO | |
285 | */ | |
286 | #ifndef CONFIG_XCOPILOT_BUGS | |
287 | do { | |
288 | #endif | |
289 | ch = GET_FIELD(rx, URX_RXDATA); | |
290 | ||
291 | if(info->is_cons) { | |
292 | if(URX_BREAK & rx) { /* whee, break received */ | |
293 | status_handle(info, rx); | |
294 | return; | |
295 | #ifdef CONFIG_MAGIC_SYSRQ | |
296 | } else if (ch == 0x10) { /* ^P */ | |
297 | show_state(); | |
298 | show_free_areas(); | |
299 | show_buffers(); | |
300 | /* show_net_buffers(); */ | |
301 | return; | |
302 | } else if (ch == 0x12) { /* ^R */ | |
804ebf46 | 303 | emergency_restart(); |
1da177e4 LT |
304 | return; |
305 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
306 | } | |
307 | /* It is a 'keyboard interrupt' ;-) */ | |
308 | #ifdef CONFIG_CONSOLE | |
309 | wake_up(&keypress_wait); | |
310 | #endif | |
311 | } | |
312 | ||
313 | if(!tty) | |
314 | goto clear_and_exit; | |
315 | ||
33f0f88f AC |
316 | flag = TTY_NORMAL; |
317 | ||
1da177e4 | 318 | if(rx & URX_PARITY_ERROR) { |
33f0f88f | 319 | flag = TTY_PARITY; |
1da177e4 LT |
320 | status_handle(info, rx); |
321 | } else if(rx & URX_OVRUN) { | |
33f0f88f | 322 | flag = TTY_OVERRUN; |
1da177e4 LT |
323 | status_handle(info, rx); |
324 | } else if(rx & URX_FRAME_ERROR) { | |
33f0f88f | 325 | flag = TTY_FRAME; |
1da177e4 | 326 | status_handle(info, rx); |
1da177e4 | 327 | } |
33f0f88f | 328 | tty_insert_flip_char(tty, ch, flag); |
1da177e4 LT |
329 | #ifndef CONFIG_XCOPILOT_BUGS |
330 | } while((rx = uart->urx.w) & URX_DATA_READY); | |
331 | #endif | |
332 | ||
8e63e66b | 333 | tty_schedule_flip(tty); |
1da177e4 LT |
334 | |
335 | clear_and_exit: | |
336 | return; | |
337 | } | |
338 | ||
41c28ff1 | 339 | static void transmit_chars(struct m68k_serial *info) |
1da177e4 LT |
340 | { |
341 | m68328_uart *uart = &uart_addr[info->line]; | |
342 | ||
343 | if (info->x_char) { | |
344 | /* Send next char */ | |
345 | uart->utx.b.txdata = info->x_char; | |
346 | info->x_char = 0; | |
347 | goto clear_and_return; | |
348 | } | |
349 | ||
350 | if((info->xmit_cnt <= 0) || info->tty->stopped) { | |
351 | /* That's peculiar... TX ints off */ | |
352 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
353 | goto clear_and_return; | |
354 | } | |
355 | ||
356 | /* Send char */ | |
357 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
358 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
359 | info->xmit_cnt--; | |
360 | ||
361 | if (info->xmit_cnt < WAKEUP_CHARS) | |
362 | schedule_work(&info->tqueue); | |
363 | ||
364 | if(info->xmit_cnt <= 0) { | |
365 | /* All done for now... TX ints off */ | |
366 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
367 | goto clear_and_return; | |
368 | } | |
369 | ||
370 | clear_and_return: | |
371 | /* Clear interrupt (should be auto)*/ | |
372 | return; | |
373 | } | |
374 | ||
375 | /* | |
376 | * This is the serial driver's generic interrupt routine | |
377 | */ | |
7d12e780 | 378 | irqreturn_t rs_interrupt(int irq, void *dev_id) |
1da177e4 LT |
379 | { |
380 | struct m68k_serial * info; | |
381 | m68328_uart *uart; | |
382 | unsigned short rx; | |
383 | unsigned short tx; | |
384 | ||
385 | info = IRQ_ports[irq]; | |
386 | if(!info) | |
387 | return IRQ_NONE; | |
388 | ||
389 | uart = &uart_addr[info->line]; | |
390 | rx = uart->urx.w; | |
391 | ||
392 | #ifdef USE_INTS | |
393 | tx = uart->utx.w; | |
394 | ||
7d12e780 | 395 | if (rx & URX_DATA_READY) receive_chars(info, rx); |
1da177e4 LT |
396 | if (tx & UTX_TX_AVAIL) transmit_chars(info); |
397 | #else | |
7d12e780 | 398 | receive_chars(info, rx); |
1da177e4 LT |
399 | #endif |
400 | return IRQ_HANDLED; | |
401 | } | |
402 | ||
931f9cde | 403 | static void do_softint(struct work_struct *work) |
1da177e4 | 404 | { |
931f9cde | 405 | struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue); |
1da177e4 LT |
406 | struct tty_struct *tty; |
407 | ||
408 | tty = info->tty; | |
409 | if (!tty) | |
410 | return; | |
411 | #if 0 | |
412 | if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { | |
413 | tty_wakeup(tty); | |
414 | } | |
415 | #endif | |
416 | } | |
417 | ||
418 | /* | |
419 | * This routine is called from the scheduler tqueue when the interrupt | |
420 | * routine has signalled that a hangup has occurred. The path of | |
421 | * hangup processing is: | |
422 | * | |
423 | * serial interrupt routine -> (scheduler tqueue) -> | |
424 | * do_serial_hangup() -> tty->hangup() -> rs_hangup() | |
425 | * | |
426 | */ | |
931f9cde | 427 | static void do_serial_hangup(struct work_struct *work) |
1da177e4 | 428 | { |
931f9cde | 429 | struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue_hangup); |
1da177e4 LT |
430 | struct tty_struct *tty; |
431 | ||
432 | tty = info->tty; | |
433 | if (!tty) | |
434 | return; | |
435 | ||
436 | tty_hangup(tty); | |
437 | } | |
438 | ||
439 | ||
440 | static int startup(struct m68k_serial * info) | |
441 | { | |
442 | m68328_uart *uart = &uart_addr[info->line]; | |
443 | unsigned long flags; | |
444 | ||
445 | if (info->flags & S_INITIALIZED) | |
446 | return 0; | |
447 | ||
448 | if (!info->xmit_buf) { | |
449 | info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL); | |
450 | if (!info->xmit_buf) | |
451 | return -ENOMEM; | |
452 | } | |
453 | ||
727dda80 | 454 | local_irq_save(flags); |
1da177e4 LT |
455 | |
456 | /* | |
457 | * Clear the FIFO buffers and disable them | |
458 | * (they will be reenabled in change_speed()) | |
459 | */ | |
460 | ||
461 | uart->ustcnt = USTCNT_UEN; | |
462 | info->xmit_fifo_size = 1; | |
463 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN; | |
464 | (void)uart->urx.w; | |
465 | ||
466 | /* | |
467 | * Finally, enable sequencing and interrupts | |
468 | */ | |
469 | #ifdef USE_INTS | |
470 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | | |
471 | USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK; | |
472 | #else | |
473 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK; | |
474 | #endif | |
475 | ||
476 | if (info->tty) | |
477 | clear_bit(TTY_IO_ERROR, &info->tty->flags); | |
478 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; | |
479 | ||
480 | /* | |
481 | * and set the speed of the serial port | |
482 | */ | |
483 | ||
484 | change_speed(info); | |
485 | ||
486 | info->flags |= S_INITIALIZED; | |
727dda80 | 487 | local_irq_restore(flags); |
1da177e4 LT |
488 | return 0; |
489 | } | |
490 | ||
491 | /* | |
492 | * This routine will shutdown a serial port; interrupts are disabled, and | |
493 | * DTR is dropped if the hangup on close termio flag is on. | |
494 | */ | |
495 | static void shutdown(struct m68k_serial * info) | |
496 | { | |
497 | m68328_uart *uart = &uart_addr[info->line]; | |
498 | unsigned long flags; | |
499 | ||
500 | uart->ustcnt = 0; /* All off! */ | |
501 | if (!(info->flags & S_INITIALIZED)) | |
502 | return; | |
503 | ||
727dda80 | 504 | local_irq_save(flags); |
1da177e4 LT |
505 | |
506 | if (info->xmit_buf) { | |
507 | free_page((unsigned long) info->xmit_buf); | |
508 | info->xmit_buf = 0; | |
509 | } | |
510 | ||
511 | if (info->tty) | |
512 | set_bit(TTY_IO_ERROR, &info->tty->flags); | |
513 | ||
514 | info->flags &= ~S_INITIALIZED; | |
727dda80 | 515 | local_irq_restore(flags); |
1da177e4 LT |
516 | } |
517 | ||
518 | struct { | |
519 | int divisor, prescale; | |
520 | } | |
521 | #ifndef CONFIG_M68VZ328 | |
522 | hw_baud_table[18] = { | |
523 | {0,0}, /* 0 */ | |
524 | {0,0}, /* 50 */ | |
525 | {0,0}, /* 75 */ | |
526 | {0,0}, /* 110 */ | |
527 | {0,0}, /* 134 */ | |
528 | {0,0}, /* 150 */ | |
529 | {0,0}, /* 200 */ | |
530 | {7,0x26}, /* 300 */ | |
531 | {6,0x26}, /* 600 */ | |
532 | {5,0x26}, /* 1200 */ | |
533 | {0,0}, /* 1800 */ | |
534 | {4,0x26}, /* 2400 */ | |
535 | {3,0x26}, /* 4800 */ | |
536 | {2,0x26}, /* 9600 */ | |
537 | {1,0x26}, /* 19200 */ | |
538 | {0,0x26}, /* 38400 */ | |
539 | {1,0x38}, /* 57600 */ | |
540 | {0,0x38}, /* 115200 */ | |
541 | }; | |
542 | #else | |
543 | hw_baud_table[18] = { | |
544 | {0,0}, /* 0 */ | |
545 | {0,0}, /* 50 */ | |
546 | {0,0}, /* 75 */ | |
547 | {0,0}, /* 110 */ | |
548 | {0,0}, /* 134 */ | |
549 | {0,0}, /* 150 */ | |
550 | {0,0}, /* 200 */ | |
551 | {0,0}, /* 300 */ | |
552 | {7,0x26}, /* 600 */ | |
553 | {6,0x26}, /* 1200 */ | |
554 | {0,0}, /* 1800 */ | |
555 | {5,0x26}, /* 2400 */ | |
556 | {4,0x26}, /* 4800 */ | |
557 | {3,0x26}, /* 9600 */ | |
558 | {2,0x26}, /* 19200 */ | |
559 | {1,0x26}, /* 38400 */ | |
560 | {0,0x26}, /* 57600 */ | |
561 | {1,0x38}, /* 115200 */ | |
562 | }; | |
563 | #endif | |
564 | /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */ | |
565 | ||
566 | /* | |
567 | * This routine is called to set the UART divisor registers to match | |
568 | * the specified baud rate for a serial port. | |
569 | */ | |
570 | static void change_speed(struct m68k_serial *info) | |
571 | { | |
572 | m68328_uart *uart = &uart_addr[info->line]; | |
573 | unsigned short port; | |
574 | unsigned short ustcnt; | |
575 | unsigned cflag; | |
576 | int i; | |
577 | ||
578 | if (!info->tty || !info->tty->termios) | |
579 | return; | |
580 | cflag = info->tty->termios->c_cflag; | |
581 | if (!(port = info->port)) | |
582 | return; | |
583 | ||
584 | ustcnt = uart->ustcnt; | |
585 | uart->ustcnt = ustcnt & ~USTCNT_TXEN; | |
586 | ||
587 | i = cflag & CBAUD; | |
588 | if (i & CBAUDEX) { | |
589 | i = (i & ~CBAUDEX) + B38400; | |
590 | } | |
591 | ||
592 | info->baud = baud_table[i]; | |
593 | uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
594 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
595 | ||
596 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
597 | ||
598 | if ((cflag & CSIZE) == CS8) | |
599 | ustcnt |= USTCNT_8_7; | |
600 | ||
601 | if (cflag & CSTOPB) | |
602 | ustcnt |= USTCNT_STOP; | |
603 | ||
604 | if (cflag & PARENB) | |
605 | ustcnt |= USTCNT_PARITYEN; | |
606 | if (cflag & PARODD) | |
607 | ustcnt |= USTCNT_ODD_EVEN; | |
608 | ||
609 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
610 | if (cflag & CRTSCTS) { | |
611 | uart->utx.w &= ~ UTX_NOCTS; | |
612 | } else { | |
613 | uart->utx.w |= UTX_NOCTS; | |
614 | } | |
615 | #endif | |
616 | ||
617 | ustcnt |= USTCNT_TXEN; | |
618 | ||
619 | uart->ustcnt = ustcnt; | |
620 | return; | |
621 | } | |
622 | ||
623 | /* | |
624 | * Fair output driver allows a process to speak. | |
625 | */ | |
626 | static void rs_fair_output(void) | |
627 | { | |
628 | int left; /* Output no more than that */ | |
629 | unsigned long flags; | |
630 | struct m68k_serial *info = &m68k_soft[0]; | |
631 | char c; | |
632 | ||
633 | if (info == 0) return; | |
634 | if (info->xmit_buf == 0) return; | |
635 | ||
727dda80 | 636 | local_irq_save(flags); |
1da177e4 LT |
637 | left = info->xmit_cnt; |
638 | while (left != 0) { | |
639 | c = info->xmit_buf[info->xmit_tail]; | |
640 | info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1); | |
641 | info->xmit_cnt--; | |
727dda80 | 642 | local_irq_restore(flags); |
1da177e4 LT |
643 | |
644 | rs_put_char(c); | |
645 | ||
727dda80 | 646 | local_irq_save(flags); |
1da177e4 LT |
647 | left = min(info->xmit_cnt, left-1); |
648 | } | |
649 | ||
650 | /* Last character is being transmitted now (hopefully). */ | |
651 | udelay(5); | |
652 | ||
727dda80 | 653 | local_irq_restore(flags); |
1da177e4 LT |
654 | return; |
655 | } | |
656 | ||
657 | /* | |
658 | * m68k_console_print is registered for printk. | |
659 | */ | |
660 | void console_print_68328(const char *p) | |
661 | { | |
662 | char c; | |
663 | ||
664 | while((c=*(p++)) != 0) { | |
665 | if(c == '\n') | |
666 | rs_put_char('\r'); | |
667 | rs_put_char(c); | |
668 | } | |
669 | ||
670 | /* Comment this if you want to have a strict interrupt-driven output */ | |
671 | rs_fair_output(); | |
672 | ||
673 | return; | |
674 | } | |
675 | ||
676 | static void rs_set_ldisc(struct tty_struct *tty) | |
677 | { | |
678 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
679 | ||
680 | if (serial_paranoia_check(info, tty->name, "rs_set_ldisc")) | |
681 | return; | |
682 | ||
683 | info->is_cons = (tty->termios->c_line == N_TTY); | |
684 | ||
685 | printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off"); | |
686 | } | |
687 | ||
688 | static void rs_flush_chars(struct tty_struct *tty) | |
689 | { | |
690 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
691 | m68328_uart *uart = &uart_addr[info->line]; | |
692 | unsigned long flags; | |
693 | ||
694 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) | |
695 | return; | |
696 | #ifndef USE_INTS | |
697 | for(;;) { | |
698 | #endif | |
699 | ||
700 | /* Enable transmitter */ | |
727dda80 | 701 | local_irq_save(flags); |
1da177e4 LT |
702 | |
703 | if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || | |
704 | !info->xmit_buf) { | |
727dda80 | 705 | local_irq_restore(flags); |
1da177e4 LT |
706 | return; |
707 | } | |
708 | ||
709 | #ifdef USE_INTS | |
710 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
711 | #else | |
712 | uart->ustcnt |= USTCNT_TXEN; | |
713 | #endif | |
714 | ||
715 | #ifdef USE_INTS | |
716 | if (uart->utx.w & UTX_TX_AVAIL) { | |
717 | #else | |
718 | if (1) { | |
719 | #endif | |
720 | /* Send char */ | |
721 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
722 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
723 | info->xmit_cnt--; | |
724 | } | |
725 | ||
726 | #ifndef USE_INTS | |
727 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
728 | } | |
729 | #endif | |
727dda80 | 730 | local_irq_restore(flags); |
1da177e4 LT |
731 | } |
732 | ||
733 | extern void console_printn(const char * b, int count); | |
734 | ||
735 | static int rs_write(struct tty_struct * tty, | |
736 | const unsigned char *buf, int count) | |
737 | { | |
738 | int c, total = 0; | |
739 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
740 | m68328_uart *uart = &uart_addr[info->line]; | |
741 | unsigned long flags; | |
742 | ||
743 | if (serial_paranoia_check(info, tty->name, "rs_write")) | |
744 | return 0; | |
745 | ||
746 | if (!tty || !info->xmit_buf) | |
747 | return 0; | |
748 | ||
727dda80 | 749 | local_save_flags(flags); |
1da177e4 | 750 | while (1) { |
727dda80 | 751 | local_irq_disable(); |
1da177e4 LT |
752 | c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, |
753 | SERIAL_XMIT_SIZE - info->xmit_head)); | |
727dda80 GU |
754 | local_irq_restore(flags); |
755 | ||
1da177e4 LT |
756 | if (c <= 0) |
757 | break; | |
758 | ||
759 | memcpy(info->xmit_buf + info->xmit_head, buf, c); | |
727dda80 GU |
760 | |
761 | local_irq_disable(); | |
1da177e4 LT |
762 | info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); |
763 | info->xmit_cnt += c; | |
727dda80 | 764 | local_irq_restore(flags); |
1da177e4 LT |
765 | buf += c; |
766 | count -= c; | |
767 | total += c; | |
768 | } | |
769 | ||
770 | if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) { | |
771 | /* Enable transmitter */ | |
727dda80 | 772 | local_irq_disable(); |
1da177e4 LT |
773 | #ifndef USE_INTS |
774 | while(info->xmit_cnt) { | |
775 | #endif | |
776 | ||
777 | uart->ustcnt |= USTCNT_TXEN; | |
778 | #ifdef USE_INTS | |
779 | uart->ustcnt |= USTCNT_TX_INTR_MASK; | |
780 | #else | |
781 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
782 | #endif | |
783 | if (uart->utx.w & UTX_TX_AVAIL) { | |
784 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
785 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
786 | info->xmit_cnt--; | |
787 | } | |
788 | ||
789 | #ifndef USE_INTS | |
790 | } | |
791 | #endif | |
727dda80 | 792 | local_irq_restore(flags); |
1da177e4 | 793 | } |
727dda80 | 794 | |
1da177e4 LT |
795 | return total; |
796 | } | |
797 | ||
798 | static int rs_write_room(struct tty_struct *tty) | |
799 | { | |
800 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
801 | int ret; | |
802 | ||
803 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) | |
804 | return 0; | |
805 | ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; | |
806 | if (ret < 0) | |
807 | ret = 0; | |
808 | return ret; | |
809 | } | |
810 | ||
811 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
812 | { | |
813 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
814 | ||
815 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) | |
816 | return 0; | |
817 | return info->xmit_cnt; | |
818 | } | |
819 | ||
820 | static void rs_flush_buffer(struct tty_struct *tty) | |
821 | { | |
822 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
727dda80 | 823 | unsigned long flags; |
1da177e4 LT |
824 | |
825 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) | |
826 | return; | |
727dda80 | 827 | local_irq_save(flags); |
1da177e4 | 828 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
727dda80 | 829 | local_irq_restore(flags); |
1da177e4 LT |
830 | tty_wakeup(tty); |
831 | } | |
832 | ||
833 | /* | |
834 | * ------------------------------------------------------------ | |
835 | * rs_throttle() | |
836 | * | |
837 | * This routine is called by the upper-layer tty layer to signal that | |
838 | * incoming characters should be throttled. | |
839 | * ------------------------------------------------------------ | |
840 | */ | |
841 | static void rs_throttle(struct tty_struct * tty) | |
842 | { | |
843 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
844 | ||
845 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) | |
846 | return; | |
847 | ||
848 | if (I_IXOFF(tty)) | |
849 | info->x_char = STOP_CHAR(tty); | |
850 | ||
851 | /* Turn off RTS line (do this atomic) */ | |
852 | } | |
853 | ||
854 | static void rs_unthrottle(struct tty_struct * tty) | |
855 | { | |
856 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
857 | ||
858 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) | |
859 | return; | |
860 | ||
861 | if (I_IXOFF(tty)) { | |
862 | if (info->x_char) | |
863 | info->x_char = 0; | |
864 | else | |
865 | info->x_char = START_CHAR(tty); | |
866 | } | |
867 | ||
868 | /* Assert RTS line (do this atomic) */ | |
869 | } | |
870 | ||
871 | /* | |
872 | * ------------------------------------------------------------ | |
873 | * rs_ioctl() and friends | |
874 | * ------------------------------------------------------------ | |
875 | */ | |
876 | ||
877 | static int get_serial_info(struct m68k_serial * info, | |
878 | struct serial_struct * retinfo) | |
879 | { | |
880 | struct serial_struct tmp; | |
881 | ||
882 | if (!retinfo) | |
883 | return -EFAULT; | |
884 | memset(&tmp, 0, sizeof(tmp)); | |
885 | tmp.type = info->type; | |
886 | tmp.line = info->line; | |
887 | tmp.port = info->port; | |
888 | tmp.irq = info->irq; | |
889 | tmp.flags = info->flags; | |
890 | tmp.baud_base = info->baud_base; | |
891 | tmp.close_delay = info->close_delay; | |
892 | tmp.closing_wait = info->closing_wait; | |
893 | tmp.custom_divisor = info->custom_divisor; | |
894 | copy_to_user(retinfo,&tmp,sizeof(*retinfo)); | |
895 | return 0; | |
896 | } | |
897 | ||
898 | static int set_serial_info(struct m68k_serial * info, | |
899 | struct serial_struct * new_info) | |
900 | { | |
901 | struct serial_struct new_serial; | |
902 | struct m68k_serial old_info; | |
903 | int retval = 0; | |
904 | ||
905 | if (!new_info) | |
906 | return -EFAULT; | |
907 | copy_from_user(&new_serial,new_info,sizeof(new_serial)); | |
908 | old_info = *info; | |
909 | ||
910 | if (!capable(CAP_SYS_ADMIN)) { | |
911 | if ((new_serial.baud_base != info->baud_base) || | |
912 | (new_serial.type != info->type) || | |
913 | (new_serial.close_delay != info->close_delay) || | |
914 | ((new_serial.flags & ~S_USR_MASK) != | |
915 | (info->flags & ~S_USR_MASK))) | |
916 | return -EPERM; | |
917 | info->flags = ((info->flags & ~S_USR_MASK) | | |
918 | (new_serial.flags & S_USR_MASK)); | |
919 | info->custom_divisor = new_serial.custom_divisor; | |
920 | goto check_and_exit; | |
921 | } | |
922 | ||
923 | if (info->count > 1) | |
924 | return -EBUSY; | |
925 | ||
926 | /* | |
927 | * OK, past this point, all the error checking has been done. | |
928 | * At this point, we start making changes..... | |
929 | */ | |
930 | ||
931 | info->baud_base = new_serial.baud_base; | |
932 | info->flags = ((info->flags & ~S_FLAGS) | | |
933 | (new_serial.flags & S_FLAGS)); | |
934 | info->type = new_serial.type; | |
935 | info->close_delay = new_serial.close_delay; | |
936 | info->closing_wait = new_serial.closing_wait; | |
937 | ||
938 | check_and_exit: | |
939 | retval = startup(info); | |
940 | return retval; | |
941 | } | |
942 | ||
943 | /* | |
944 | * get_lsr_info - get line status register info | |
945 | * | |
946 | * Purpose: Let user call ioctl() to get info when the UART physically | |
947 | * is emptied. On bus types like RS485, the transmitter must | |
948 | * release the bus after transmitting. This must be done when | |
949 | * the transmit shift register is empty, not be done when the | |
950 | * transmit holding register is empty. This functionality | |
951 | * allows an RS485 driver to be written in user space. | |
952 | */ | |
953 | static int get_lsr_info(struct m68k_serial * info, unsigned int *value) | |
954 | { | |
955 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
956 | m68328_uart *uart = &uart_addr[info->line]; | |
957 | #endif | |
958 | unsigned char status; | |
727dda80 | 959 | unsigned long flags; |
1da177e4 | 960 | |
727dda80 | 961 | local_irq_save(flags); |
1da177e4 LT |
962 | #ifdef CONFIG_SERIAL_68328_RTS_CTS |
963 | status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0; | |
964 | #else | |
965 | status = 0; | |
966 | #endif | |
727dda80 | 967 | local_irq_restore(flags); |
1da177e4 LT |
968 | put_user(status,value); |
969 | return 0; | |
970 | } | |
971 | ||
972 | /* | |
973 | * This routine sends a break character out the serial port. | |
974 | */ | |
6a72c7ba | 975 | static void send_break(struct m68k_serial * info, unsigned int duration) |
1da177e4 LT |
976 | { |
977 | m68328_uart *uart = &uart_addr[info->line]; | |
978 | unsigned long flags; | |
979 | if (!info->port) | |
980 | return; | |
727dda80 | 981 | local_irq_save(flags); |
1da177e4 LT |
982 | #ifdef USE_INTS |
983 | uart->utx.w |= UTX_SEND_BREAK; | |
6a72c7ba | 984 | msleep_interruptible(duration); |
1da177e4 LT |
985 | uart->utx.w &= ~UTX_SEND_BREAK; |
986 | #endif | |
727dda80 | 987 | local_irq_restore(flags); |
1da177e4 LT |
988 | } |
989 | ||
990 | static int rs_ioctl(struct tty_struct *tty, struct file * file, | |
991 | unsigned int cmd, unsigned long arg) | |
992 | { | |
993 | int error; | |
994 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
995 | int retval; | |
996 | ||
997 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
998 | return -ENODEV; | |
999 | ||
1000 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
1001 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && | |
1002 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { | |
1003 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
1004 | return -EIO; | |
1005 | } | |
1006 | ||
1007 | switch (cmd) { | |
1008 | case TCSBRK: /* SVID version: non-zero arg --> no break */ | |
1009 | retval = tty_check_change(tty); | |
1010 | if (retval) | |
1011 | return retval; | |
1012 | tty_wait_until_sent(tty, 0); | |
1013 | if (!arg) | |
6a72c7ba | 1014 | send_break(info, 250); /* 1/4 second */ |
1da177e4 LT |
1015 | return 0; |
1016 | case TCSBRKP: /* support for POSIX tcsendbreak() */ | |
1017 | retval = tty_check_change(tty); | |
1018 | if (retval) | |
1019 | return retval; | |
1020 | tty_wait_until_sent(tty, 0); | |
6a72c7ba | 1021 | send_break(info, arg ? arg*(100) : 250); |
1da177e4 LT |
1022 | return 0; |
1023 | case TIOCGSOFTCAR: | |
1024 | error = put_user(C_CLOCAL(tty) ? 1 : 0, | |
1025 | (unsigned long *) arg); | |
1026 | if (error) | |
1027 | return error; | |
1028 | return 0; | |
1029 | case TIOCSSOFTCAR: | |
1030 | get_user(arg, (unsigned long *) arg); | |
1031 | tty->termios->c_cflag = | |
1032 | ((tty->termios->c_cflag & ~CLOCAL) | | |
1033 | (arg ? CLOCAL : 0)); | |
1034 | return 0; | |
1035 | case TIOCGSERIAL: | |
1036 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
1037 | sizeof(struct serial_struct))) | |
1038 | return get_serial_info(info, | |
1039 | (struct serial_struct *) arg); | |
1040 | return -EFAULT; | |
1041 | case TIOCSSERIAL: | |
1042 | return set_serial_info(info, | |
1043 | (struct serial_struct *) arg); | |
1044 | case TIOCSERGETLSR: /* Get line status register */ | |
1045 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
727dda80 | 1046 | sizeof(unsigned int))) |
1da177e4 LT |
1047 | return get_lsr_info(info, (unsigned int *) arg); |
1048 | return -EFAULT; | |
1049 | case TIOCSERGSTRUCT: | |
1050 | if (!access_ok(VERIFY_WRITE, (void *) arg, | |
1051 | sizeof(struct m68k_serial))) | |
1052 | return -EFAULT; | |
1053 | copy_to_user((struct m68k_serial *) arg, | |
1054 | info, sizeof(struct m68k_serial)); | |
1055 | return 0; | |
1056 | ||
1057 | default: | |
1058 | return -ENOIOCTLCMD; | |
1059 | } | |
1060 | return 0; | |
1061 | } | |
1062 | ||
606d099c | 1063 | static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
1da177e4 LT |
1064 | { |
1065 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
1066 | ||
1067 | if (tty->termios->c_cflag == old_termios->c_cflag) | |
1068 | return; | |
1069 | ||
1070 | change_speed(info); | |
1071 | ||
1072 | if ((old_termios->c_cflag & CRTSCTS) && | |
1073 | !(tty->termios->c_cflag & CRTSCTS)) { | |
1074 | tty->hw_stopped = 0; | |
1075 | rs_start(tty); | |
1076 | } | |
1077 | ||
1078 | } | |
1079 | ||
1080 | /* | |
1081 | * ------------------------------------------------------------ | |
1082 | * rs_close() | |
1083 | * | |
1084 | * This routine is called when the serial port gets closed. First, we | |
1085 | * wait for the last remaining data to be sent. Then, we unlink its | |
1086 | * S structure from the interrupt chain if necessary, and we free | |
1087 | * that IRQ if nothing is left in the chain. | |
1088 | * ------------------------------------------------------------ | |
1089 | */ | |
1090 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
1091 | { | |
1092 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1093 | m68328_uart *uart = &uart_addr[info->line]; | |
1094 | unsigned long flags; | |
1095 | ||
1096 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) | |
1097 | return; | |
1098 | ||
727dda80 | 1099 | local_irq_save(flags); |
1da177e4 LT |
1100 | |
1101 | if (tty_hung_up_p(filp)) { | |
727dda80 | 1102 | local_irq_restore(flags); |
1da177e4 LT |
1103 | return; |
1104 | } | |
1105 | ||
1106 | if ((tty->count == 1) && (info->count != 1)) { | |
1107 | /* | |
1108 | * Uh, oh. tty->count is 1, which means that the tty | |
1109 | * structure will be freed. Info->count should always | |
1110 | * be one in these conditions. If it's greater than | |
1111 | * one, we've got real problems, since it means the | |
1112 | * serial port won't be shutdown. | |
1113 | */ | |
1114 | printk("rs_close: bad serial port count; tty->count is 1, " | |
1115 | "info->count is %d\n", info->count); | |
1116 | info->count = 1; | |
1117 | } | |
1118 | if (--info->count < 0) { | |
1119 | printk("rs_close: bad serial port count for ttyS%d: %d\n", | |
1120 | info->line, info->count); | |
1121 | info->count = 0; | |
1122 | } | |
1123 | if (info->count) { | |
727dda80 | 1124 | local_irq_restore(flags); |
1da177e4 LT |
1125 | return; |
1126 | } | |
1127 | info->flags |= S_CLOSING; | |
1128 | /* | |
1129 | * Now we wait for the transmit buffer to clear; and we notify | |
1130 | * the line discipline to only process XON/XOFF characters. | |
1131 | */ | |
1132 | tty->closing = 1; | |
1133 | if (info->closing_wait != S_CLOSING_WAIT_NONE) | |
1134 | tty_wait_until_sent(tty, info->closing_wait); | |
1135 | /* | |
1136 | * At this point we stop accepting input. To do this, we | |
1137 | * disable the receive line status interrupts, and tell the | |
1138 | * interrupt driver to stop checking the data ready bit in the | |
1139 | * line status register. | |
1140 | */ | |
1141 | ||
1142 | uart->ustcnt &= ~USTCNT_RXEN; | |
1143 | uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK); | |
1144 | ||
1145 | shutdown(info); | |
1146 | if (tty->driver->flush_buffer) | |
1147 | tty->driver->flush_buffer(tty); | |
1148 | ||
1149 | tty_ldisc_flush(tty); | |
1150 | tty->closing = 0; | |
1151 | info->event = 0; | |
1152 | info->tty = 0; | |
1153 | #warning "This is not and has never been valid so fix it" | |
1154 | #if 0 | |
1155 | if (tty->ldisc.num != ldiscs[N_TTY].num) { | |
1156 | if (tty->ldisc.close) | |
1157 | (tty->ldisc.close)(tty); | |
1158 | tty->ldisc = ldiscs[N_TTY]; | |
1159 | tty->termios->c_line = N_TTY; | |
1160 | if (tty->ldisc.open) | |
1161 | (tty->ldisc.open)(tty); | |
1162 | } | |
1163 | #endif | |
1164 | if (info->blocked_open) { | |
1165 | if (info->close_delay) { | |
1166 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); | |
1167 | } | |
1168 | wake_up_interruptible(&info->open_wait); | |
1169 | } | |
1170 | info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING); | |
1171 | wake_up_interruptible(&info->close_wait); | |
727dda80 | 1172 | local_irq_restore(flags); |
1da177e4 LT |
1173 | } |
1174 | ||
1175 | /* | |
1176 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
1177 | */ | |
1178 | void rs_hangup(struct tty_struct *tty) | |
1179 | { | |
1180 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1181 | ||
1182 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) | |
1183 | return; | |
1184 | ||
1185 | rs_flush_buffer(tty); | |
1186 | shutdown(info); | |
1187 | info->event = 0; | |
1188 | info->count = 0; | |
1189 | info->flags &= ~S_NORMAL_ACTIVE; | |
1190 | info->tty = 0; | |
1191 | wake_up_interruptible(&info->open_wait); | |
1192 | } | |
1193 | ||
1194 | /* | |
1195 | * ------------------------------------------------------------ | |
1196 | * rs_open() and friends | |
1197 | * ------------------------------------------------------------ | |
1198 | */ | |
1199 | static int block_til_ready(struct tty_struct *tty, struct file * filp, | |
1200 | struct m68k_serial *info) | |
1201 | { | |
1202 | DECLARE_WAITQUEUE(wait, current); | |
1203 | int retval; | |
1204 | int do_clocal = 0; | |
1205 | ||
1206 | /* | |
1207 | * If the device is in the middle of being closed, then block | |
1208 | * until it's done, and then try again. | |
1209 | */ | |
1210 | if (info->flags & S_CLOSING) { | |
1211 | interruptible_sleep_on(&info->close_wait); | |
1212 | #ifdef SERIAL_DO_RESTART | |
1213 | if (info->flags & S_HUP_NOTIFY) | |
1214 | return -EAGAIN; | |
1215 | else | |
1216 | return -ERESTARTSYS; | |
1217 | #else | |
1218 | return -EAGAIN; | |
1219 | #endif | |
1220 | } | |
1221 | ||
1222 | /* | |
1223 | * If non-blocking mode is set, or the port is not enabled, | |
1224 | * then make the check up front and then exit. | |
1225 | */ | |
1226 | if ((filp->f_flags & O_NONBLOCK) || | |
1227 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
1228 | info->flags |= S_NORMAL_ACTIVE; | |
1229 | return 0; | |
1230 | } | |
1231 | ||
1232 | if (tty->termios->c_cflag & CLOCAL) | |
1233 | do_clocal = 1; | |
1234 | ||
1235 | /* | |
1236 | * Block waiting for the carrier detect and the line to become | |
1237 | * free (i.e., not in use by the callout). While we are in | |
1238 | * this loop, info->count is dropped by one, so that | |
1239 | * rs_close() knows when to free things. We restore it upon | |
1240 | * exit, either normal or abnormal. | |
1241 | */ | |
1242 | retval = 0; | |
1243 | add_wait_queue(&info->open_wait, &wait); | |
1244 | ||
1245 | info->count--; | |
1246 | info->blocked_open++; | |
1247 | while (1) { | |
727dda80 | 1248 | local_irq_disable(); |
1da177e4 | 1249 | m68k_rtsdtr(info, 1); |
727dda80 | 1250 | local_irq_enable(); |
1da177e4 LT |
1251 | current->state = TASK_INTERRUPTIBLE; |
1252 | if (tty_hung_up_p(filp) || | |
1253 | !(info->flags & S_INITIALIZED)) { | |
1254 | #ifdef SERIAL_DO_RESTART | |
1255 | if (info->flags & S_HUP_NOTIFY) | |
1256 | retval = -EAGAIN; | |
1257 | else | |
1258 | retval = -ERESTARTSYS; | |
1259 | #else | |
1260 | retval = -EAGAIN; | |
1261 | #endif | |
1262 | break; | |
1263 | } | |
1264 | if (!(info->flags & S_CLOSING) && do_clocal) | |
1265 | break; | |
1266 | if (signal_pending(current)) { | |
1267 | retval = -ERESTARTSYS; | |
1268 | break; | |
1269 | } | |
1270 | schedule(); | |
1271 | } | |
1272 | current->state = TASK_RUNNING; | |
1273 | remove_wait_queue(&info->open_wait, &wait); | |
1274 | if (!tty_hung_up_p(filp)) | |
1275 | info->count++; | |
1276 | info->blocked_open--; | |
1277 | ||
1278 | if (retval) | |
1279 | return retval; | |
1280 | info->flags |= S_NORMAL_ACTIVE; | |
1281 | return 0; | |
1282 | } | |
1283 | ||
1284 | /* | |
1285 | * This routine is called whenever a serial port is opened. It | |
1286 | * enables interrupts for a serial port, linking in its S structure into | |
1287 | * the IRQ chain. It also performs the serial-specific | |
1288 | * initialization for the tty structure. | |
1289 | */ | |
1290 | int rs_open(struct tty_struct *tty, struct file * filp) | |
1291 | { | |
1292 | struct m68k_serial *info; | |
1293 | int retval, line; | |
1294 | ||
1295 | line = tty->index; | |
1296 | ||
1297 | if (line >= NR_PORTS || line < 0) /* we have exactly one */ | |
1298 | return -ENODEV; | |
1299 | ||
1300 | info = &m68k_soft[line]; | |
1301 | ||
1302 | if (serial_paranoia_check(info, tty->name, "rs_open")) | |
1303 | return -ENODEV; | |
1304 | ||
1305 | info->count++; | |
1306 | tty->driver_data = info; | |
1307 | info->tty = tty; | |
1308 | ||
1309 | /* | |
1310 | * Start up serial port | |
1311 | */ | |
1312 | retval = startup(info); | |
1313 | if (retval) | |
1314 | return retval; | |
1315 | ||
1316 | return block_til_ready(tty, filp, info); | |
1317 | } | |
1318 | ||
1319 | /* Finally, routines used to initialize the serial driver. */ | |
1320 | ||
1321 | static void show_serial_version(void) | |
1322 | { | |
1323 | printk("MC68328 serial driver version 1.00\n"); | |
1324 | } | |
1325 | ||
b68e31d0 | 1326 | static const struct tty_operations rs_ops = { |
1da177e4 LT |
1327 | .open = rs_open, |
1328 | .close = rs_close, | |
1329 | .write = rs_write, | |
1330 | .flush_chars = rs_flush_chars, | |
1331 | .write_room = rs_write_room, | |
1332 | .chars_in_buffer = rs_chars_in_buffer, | |
1333 | .flush_buffer = rs_flush_buffer, | |
1334 | .ioctl = rs_ioctl, | |
1335 | .throttle = rs_throttle, | |
1336 | .unthrottle = rs_unthrottle, | |
1337 | .set_termios = rs_set_termios, | |
1338 | .stop = rs_stop, | |
1339 | .start = rs_start, | |
1340 | .hangup = rs_hangup, | |
1341 | .set_ldisc = rs_set_ldisc, | |
1342 | }; | |
1343 | ||
1344 | /* rs_init inits the driver */ | |
1345 | static int __init | |
1346 | rs68328_init(void) | |
1347 | { | |
1348 | int flags, i; | |
1349 | struct m68k_serial *info; | |
1350 | ||
1351 | serial_driver = alloc_tty_driver(NR_PORTS); | |
1352 | if (!serial_driver) | |
1353 | return -ENOMEM; | |
1354 | ||
1355 | show_serial_version(); | |
1356 | ||
1357 | /* Initialize the tty_driver structure */ | |
1358 | /* SPARC: Not all of this is exactly right for us. */ | |
1359 | ||
1360 | serial_driver->name = "ttyS"; | |
1361 | serial_driver->major = TTY_MAJOR; | |
1362 | serial_driver->minor_start = 64; | |
1363 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
1364 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
1365 | serial_driver->init_termios = tty_std_termios; | |
1366 | serial_driver->init_termios.c_cflag = | |
1367 | m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL; | |
1368 | serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
1369 | tty_set_operations(serial_driver, &rs_ops); | |
1370 | ||
1371 | if (tty_register_driver(serial_driver)) { | |
1372 | put_tty_driver(serial_driver); | |
1373 | printk(KERN_ERR "Couldn't register serial driver\n"); | |
1374 | return -ENOMEM; | |
1375 | } | |
1376 | ||
727dda80 | 1377 | local_irq_save(flags); |
1da177e4 LT |
1378 | |
1379 | for(i=0;i<NR_PORTS;i++) { | |
1380 | ||
1381 | info = &m68k_soft[i]; | |
1382 | info->magic = SERIAL_MAGIC; | |
1383 | info->port = (int) &uart_addr[i]; | |
1384 | info->tty = 0; | |
1385 | info->irq = uart_irqs[i]; | |
1386 | info->custom_divisor = 16; | |
1387 | info->close_delay = 50; | |
1388 | info->closing_wait = 3000; | |
1389 | info->x_char = 0; | |
1390 | info->event = 0; | |
1391 | info->count = 0; | |
1392 | info->blocked_open = 0; | |
931f9cde GU |
1393 | INIT_WORK(&info->tqueue, do_softint); |
1394 | INIT_WORK(&info->tqueue_hangup, do_serial_hangup); | |
1da177e4 LT |
1395 | init_waitqueue_head(&info->open_wait); |
1396 | init_waitqueue_head(&info->close_wait); | |
1397 | info->line = i; | |
1398 | info->is_cons = 1; /* Means shortcuts work */ | |
1399 | ||
1400 | printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line, | |
1401 | info->port, info->irq); | |
1402 | printk(" is a builtin MC68328 UART\n"); | |
1403 | ||
1404 | IRQ_ports[info->irq] = info; /* waste of space */ | |
1405 | ||
1406 | #ifdef CONFIG_M68VZ328 | |
1407 | if (i > 0 ) | |
1408 | PJSEL &= 0xCF; /* PSW enable second port output */ | |
1409 | #endif | |
1410 | ||
1411 | if (request_irq(uart_irqs[i], | |
1412 | rs_interrupt, | |
1413 | IRQ_FLG_STD, | |
1414 | "M68328_UART", NULL)) | |
1415 | panic("Unable to attach 68328 serial interrupt\n"); | |
1da177e4 | 1416 | } |
727dda80 | 1417 | local_irq_restore(flags); |
1da177e4 LT |
1418 | return 0; |
1419 | } | |
1420 | ||
1da177e4 LT |
1421 | module_init(rs68328_init); |
1422 | ||
1423 | ||
1424 | ||
1425 | static void m68328_set_baud(void) | |
1426 | { | |
1427 | unsigned short ustcnt; | |
1428 | int i; | |
1429 | ||
1430 | ustcnt = USTCNT; | |
1431 | USTCNT = ustcnt & ~USTCNT_TXEN; | |
1432 | ||
1433 | again: | |
1434 | for (i = 0; i < sizeof(baud_table) / sizeof(baud_table[0]); i++) | |
1435 | if (baud_table[i] == m68328_console_baud) | |
1436 | break; | |
1437 | if (i >= sizeof(baud_table) / sizeof(baud_table[0])) { | |
1438 | m68328_console_baud = 9600; | |
1439 | goto again; | |
1440 | } | |
1441 | ||
1442 | UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
1443 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
1444 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
1445 | ustcnt |= USTCNT_8_7; | |
1446 | ustcnt |= USTCNT_TXEN; | |
1447 | USTCNT = ustcnt; | |
1448 | m68328_console_initted = 1; | |
1449 | return; | |
1450 | } | |
1451 | ||
1452 | ||
1453 | int m68328_console_setup(struct console *cp, char *arg) | |
1454 | { | |
1455 | int i, n = CONSOLE_BAUD_RATE; | |
1456 | ||
1457 | if (!cp) | |
1458 | return(-1); | |
1459 | ||
1460 | if (arg) | |
1461 | n = simple_strtoul(arg,NULL,0); | |
1462 | ||
1463 | for (i = 0; i < BAUD_TABLE_SIZE; i++) | |
1464 | if (baud_table[i] == n) | |
1465 | break; | |
1466 | if (i < BAUD_TABLE_SIZE) { | |
1467 | m68328_console_baud = n; | |
1468 | m68328_console_cbaud = 0; | |
1469 | if (i > 15) { | |
1470 | m68328_console_cbaud |= CBAUDEX; | |
1471 | i -= 15; | |
1472 | } | |
1473 | m68328_console_cbaud |= i; | |
1474 | } | |
1475 | ||
1476 | m68328_set_baud(); /* make sure baud rate changes */ | |
1477 | return(0); | |
1478 | } | |
1479 | ||
1480 | ||
1481 | static struct tty_driver *m68328_console_device(struct console *c, int *index) | |
1482 | { | |
1483 | *index = c->index; | |
1484 | return serial_driver; | |
1485 | } | |
1486 | ||
1487 | ||
1488 | void m68328_console_write (struct console *co, const char *str, | |
1489 | unsigned int count) | |
1490 | { | |
1491 | if (!m68328_console_initted) | |
1492 | m68328_set_baud(); | |
1493 | while (count--) { | |
1494 | if (*str == '\n') | |
1495 | rs_put_char('\r'); | |
1496 | rs_put_char( *str++ ); | |
1497 | } | |
1498 | } | |
1499 | ||
1500 | ||
1501 | static struct console m68328_driver = { | |
1502 | .name = "ttyS", | |
1503 | .write = m68328_console_write, | |
1504 | .device = m68328_console_device, | |
1505 | .setup = m68328_console_setup, | |
1506 | .flags = CON_PRINTBUFFER, | |
1507 | .index = -1, | |
1508 | }; | |
1509 | ||
1510 | ||
1511 | static int __init m68328_console_init(void) | |
1512 | { | |
1513 | register_console(&m68328_driver); | |
1514 | return 0; | |
1515 | } | |
1516 | ||
1517 | console_initcall(m68328_console_init); |