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> | |
5a0e3ad6 | 38 | #include <linux/gfp.h> |
1da177e4 LT |
39 | |
40 | #include <asm/io.h> | |
41 | #include <asm/irq.h> | |
42 | #include <asm/system.h> | |
1da177e4 LT |
43 | #include <asm/delay.h> |
44 | #include <asm/uaccess.h> | |
45 | ||
46 | /* (es) */ | |
47 | /* note: perhaps we can murge these files, so that you can just | |
48 | * define 1 of them, and they can sort that out for themselves | |
49 | */ | |
50 | #if defined(CONFIG_M68EZ328) | |
51 | #include <asm/MC68EZ328.h> | |
52 | #else | |
53 | #if defined(CONFIG_M68VZ328) | |
54 | #include <asm/MC68VZ328.h> | |
55 | #else | |
56 | #include <asm/MC68328.h> | |
57 | #endif /* CONFIG_M68VZ328 */ | |
58 | #endif /* CONFIG_M68EZ328 */ | |
59 | ||
60 | #include "68328serial.h" | |
61 | ||
62 | /* Turn off usage of real serial interrupt code, to "support" Copilot */ | |
63 | #ifdef CONFIG_XCOPILOT_BUGS | |
64 | #undef USE_INTS | |
65 | #else | |
66 | #define USE_INTS | |
67 | #endif | |
68 | ||
69 | static struct m68k_serial m68k_soft[NR_PORTS]; | |
1da177e4 LT |
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 | ||
1da177e4 LT |
81 | struct tty_driver *serial_driver; |
82 | ||
1da177e4 LT |
83 | /* number of characters left in xmit buffer before we ask for more */ |
84 | #define WAKEUP_CHARS 256 | |
85 | ||
86 | /* Debugging... DEBUG_INTR is bad to use when one of the zs | |
87 | * lines is your console ;( | |
88 | */ | |
89 | #undef SERIAL_DEBUG_INTR | |
90 | #undef SERIAL_DEBUG_OPEN | |
91 | #undef SERIAL_DEBUG_FLOW | |
92 | ||
93 | #define RS_ISR_PASS_LIMIT 256 | |
94 | ||
1da177e4 LT |
95 | static void change_speed(struct m68k_serial *info); |
96 | ||
97 | /* | |
98 | * Setup for console. Argument comes from the boot command line. | |
99 | */ | |
100 | ||
101 | #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ) | |
102 | #define CONSOLE_BAUD_RATE 115200 | |
103 | #define DEFAULT_CBAUD B115200 | |
104 | #else | |
105 | /* (es) */ | |
106 | /* note: this is messy, but it works, again, perhaps defined somewhere else?*/ | |
107 | #ifdef CONFIG_M68VZ328 | |
108 | #define CONSOLE_BAUD_RATE 19200 | |
109 | #define DEFAULT_CBAUD B19200 | |
110 | #endif | |
111 | /* (/es) */ | |
112 | #endif | |
113 | ||
114 | #ifndef CONSOLE_BAUD_RATE | |
115 | #define CONSOLE_BAUD_RATE 9600 | |
116 | #define DEFAULT_CBAUD B9600 | |
117 | #endif | |
118 | ||
119 | ||
120 | static int m68328_console_initted = 0; | |
121 | static int m68328_console_baud = CONSOLE_BAUD_RATE; | |
122 | static int m68328_console_cbaud = DEFAULT_CBAUD; | |
123 | ||
124 | ||
1da177e4 LT |
125 | static inline int serial_paranoia_check(struct m68k_serial *info, |
126 | char *name, const char *routine) | |
127 | { | |
128 | #ifdef SERIAL_PARANOIA_CHECK | |
129 | static const char *badmagic = | |
130 | "Warning: bad magic number for serial struct %s in %s\n"; | |
131 | static const char *badinfo = | |
132 | "Warning: null m68k_serial for %s in %s\n"; | |
133 | ||
134 | if (!info) { | |
135 | printk(badinfo, name, routine); | |
136 | return 1; | |
137 | } | |
138 | if (info->magic != SERIAL_MAGIC) { | |
139 | printk(badmagic, name, routine); | |
140 | return 1; | |
141 | } | |
142 | #endif | |
143 | return 0; | |
144 | } | |
145 | ||
146 | /* | |
147 | * This is used to figure out the divisor speeds and the timeouts | |
148 | */ | |
149 | static int baud_table[] = { | |
150 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, | |
151 | 9600, 19200, 38400, 57600, 115200, 0 }; | |
152 | ||
1da177e4 LT |
153 | /* Sets or clears DTR/RTS on the requested line */ |
154 | static inline void m68k_rtsdtr(struct m68k_serial *ss, int set) | |
155 | { | |
156 | if (set) { | |
157 | /* set the RTS/CTS line */ | |
158 | } else { | |
159 | /* clear it */ | |
160 | } | |
161 | return; | |
162 | } | |
163 | ||
164 | /* Utility routines */ | |
165 | static inline int get_baud(struct m68k_serial *ss) | |
166 | { | |
167 | unsigned long result = 115200; | |
168 | unsigned short int baud = uart_addr[ss->line].ubaud; | |
169 | if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400; | |
170 | result >>= GET_FIELD(baud, UBAUD_DIVIDE); | |
171 | ||
172 | return result; | |
173 | } | |
174 | ||
175 | /* | |
176 | * ------------------------------------------------------------ | |
177 | * rs_stop() and rs_start() | |
178 | * | |
179 | * This routines are called before setting or resetting tty->stopped. | |
180 | * They enable or disable transmitter interrupts, as necessary. | |
181 | * ------------------------------------------------------------ | |
182 | */ | |
183 | static void rs_stop(struct tty_struct *tty) | |
184 | { | |
185 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
186 | m68328_uart *uart = &uart_addr[info->line]; | |
187 | unsigned long flags; | |
188 | ||
189 | if (serial_paranoia_check(info, tty->name, "rs_stop")) | |
190 | return; | |
191 | ||
727dda80 | 192 | local_irq_save(flags); |
1da177e4 | 193 | uart->ustcnt &= ~USTCNT_TXEN; |
727dda80 | 194 | local_irq_restore(flags); |
1da177e4 LT |
195 | } |
196 | ||
09a6ffa8 | 197 | static int rs_put_char(char ch) |
1da177e4 LT |
198 | { |
199 | int flags, loops = 0; | |
200 | ||
727dda80 | 201 | local_irq_save(flags); |
1da177e4 LT |
202 | |
203 | while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) { | |
204 | loops++; | |
205 | udelay(5); | |
206 | } | |
207 | ||
208 | UTX_TXDATA = ch; | |
209 | udelay(5); | |
727dda80 | 210 | local_irq_restore(flags); |
09a6ffa8 | 211 | return 1; |
1da177e4 LT |
212 | } |
213 | ||
214 | static void rs_start(struct tty_struct *tty) | |
215 | { | |
216 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
217 | m68328_uart *uart = &uart_addr[info->line]; | |
218 | unsigned long flags; | |
219 | ||
220 | if (serial_paranoia_check(info, tty->name, "rs_start")) | |
221 | return; | |
222 | ||
727dda80 | 223 | local_irq_save(flags); |
1da177e4 LT |
224 | if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) { |
225 | #ifdef USE_INTS | |
226 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
227 | #else | |
228 | uart->ustcnt |= USTCNT_TXEN; | |
229 | #endif | |
230 | } | |
727dda80 | 231 | local_irq_restore(flags); |
1da177e4 LT |
232 | } |
233 | ||
234 | /* Drop into either the boot monitor or kadb upon receiving a break | |
235 | * from keyboard/console input. | |
236 | */ | |
237 | static void batten_down_hatches(void) | |
238 | { | |
239 | /* Drop into the debugger */ | |
240 | } | |
241 | ||
41c28ff1 | 242 | static void status_handle(struct m68k_serial *info, unsigned short status) |
1da177e4 LT |
243 | { |
244 | #if 0 | |
245 | if(status & DCD) { | |
a88487c7 | 246 | if((info->port.tty->termios->c_cflag & CRTSCTS) && |
1da177e4 LT |
247 | ((info->curregs[3] & AUTO_ENAB)==0)) { |
248 | info->curregs[3] |= AUTO_ENAB; | |
249 | info->pendregs[3] |= AUTO_ENAB; | |
250 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
251 | } | |
252 | } else { | |
253 | if((info->curregs[3] & AUTO_ENAB)) { | |
254 | info->curregs[3] &= ~AUTO_ENAB; | |
255 | info->pendregs[3] &= ~AUTO_ENAB; | |
256 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
257 | } | |
258 | } | |
259 | #endif | |
260 | /* If this is console input and this is a | |
261 | * 'break asserted' status change interrupt | |
262 | * see if we can drop into the debugger | |
263 | */ | |
264 | if((status & URX_BREAK) && info->break_abort) | |
265 | batten_down_hatches(); | |
266 | return; | |
267 | } | |
268 | ||
7d12e780 | 269 | static void receive_chars(struct m68k_serial *info, unsigned short rx) |
1da177e4 | 270 | { |
a88487c7 | 271 | struct tty_struct *tty = info->port.tty; |
1da177e4 | 272 | m68328_uart *uart = &uart_addr[info->line]; |
33f0f88f | 273 | unsigned char ch, flag; |
1da177e4 LT |
274 | |
275 | /* | |
276 | * This do { } while() loop will get ALL chars out of Rx FIFO | |
277 | */ | |
278 | #ifndef CONFIG_XCOPILOT_BUGS | |
279 | do { | |
280 | #endif | |
281 | ch = GET_FIELD(rx, URX_RXDATA); | |
282 | ||
283 | if(info->is_cons) { | |
284 | if(URX_BREAK & rx) { /* whee, break received */ | |
285 | status_handle(info, rx); | |
286 | return; | |
287 | #ifdef CONFIG_MAGIC_SYSRQ | |
288 | } else if (ch == 0x10) { /* ^P */ | |
289 | show_state(); | |
290 | show_free_areas(); | |
291 | show_buffers(); | |
292 | /* show_net_buffers(); */ | |
293 | return; | |
294 | } else if (ch == 0x12) { /* ^R */ | |
804ebf46 | 295 | emergency_restart(); |
1da177e4 LT |
296 | return; |
297 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
298 | } | |
1da177e4 LT |
299 | } |
300 | ||
301 | if(!tty) | |
302 | goto clear_and_exit; | |
303 | ||
33f0f88f AC |
304 | flag = TTY_NORMAL; |
305 | ||
1da177e4 | 306 | if(rx & URX_PARITY_ERROR) { |
33f0f88f | 307 | flag = TTY_PARITY; |
1da177e4 LT |
308 | status_handle(info, rx); |
309 | } else if(rx & URX_OVRUN) { | |
33f0f88f | 310 | flag = TTY_OVERRUN; |
1da177e4 LT |
311 | status_handle(info, rx); |
312 | } else if(rx & URX_FRAME_ERROR) { | |
33f0f88f | 313 | flag = TTY_FRAME; |
1da177e4 | 314 | status_handle(info, rx); |
1da177e4 | 315 | } |
33f0f88f | 316 | tty_insert_flip_char(tty, ch, flag); |
1da177e4 LT |
317 | #ifndef CONFIG_XCOPILOT_BUGS |
318 | } while((rx = uart->urx.w) & URX_DATA_READY); | |
319 | #endif | |
320 | ||
8e63e66b | 321 | tty_schedule_flip(tty); |
1da177e4 LT |
322 | |
323 | clear_and_exit: | |
324 | return; | |
325 | } | |
326 | ||
41c28ff1 | 327 | static void transmit_chars(struct m68k_serial *info) |
1da177e4 LT |
328 | { |
329 | m68328_uart *uart = &uart_addr[info->line]; | |
330 | ||
331 | if (info->x_char) { | |
332 | /* Send next char */ | |
333 | uart->utx.b.txdata = info->x_char; | |
334 | info->x_char = 0; | |
335 | goto clear_and_return; | |
336 | } | |
337 | ||
a88487c7 | 338 | if((info->xmit_cnt <= 0) || info->port.tty->stopped) { |
1da177e4 LT |
339 | /* That's peculiar... TX ints off */ |
340 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
341 | goto clear_and_return; | |
342 | } | |
343 | ||
344 | /* Send char */ | |
345 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
346 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
347 | info->xmit_cnt--; | |
348 | ||
349 | if (info->xmit_cnt < WAKEUP_CHARS) | |
350 | schedule_work(&info->tqueue); | |
351 | ||
352 | if(info->xmit_cnt <= 0) { | |
353 | /* All done for now... TX ints off */ | |
354 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
355 | goto clear_and_return; | |
356 | } | |
357 | ||
358 | clear_and_return: | |
359 | /* Clear interrupt (should be auto)*/ | |
360 | return; | |
361 | } | |
362 | ||
363 | /* | |
364 | * This is the serial driver's generic interrupt routine | |
365 | */ | |
7d12e780 | 366 | irqreturn_t rs_interrupt(int irq, void *dev_id) |
1da177e4 | 367 | { |
25db8ad5 | 368 | struct m68k_serial *info = dev_id; |
1da177e4 LT |
369 | m68328_uart *uart; |
370 | unsigned short rx; | |
371 | unsigned short tx; | |
372 | ||
1da177e4 LT |
373 | uart = &uart_addr[info->line]; |
374 | rx = uart->urx.w; | |
375 | ||
376 | #ifdef USE_INTS | |
377 | tx = uart->utx.w; | |
378 | ||
7d12e780 | 379 | if (rx & URX_DATA_READY) receive_chars(info, rx); |
1da177e4 LT |
380 | if (tx & UTX_TX_AVAIL) transmit_chars(info); |
381 | #else | |
7d12e780 | 382 | receive_chars(info, rx); |
1da177e4 LT |
383 | #endif |
384 | return IRQ_HANDLED; | |
385 | } | |
386 | ||
931f9cde | 387 | static void do_softint(struct work_struct *work) |
1da177e4 | 388 | { |
931f9cde | 389 | struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue); |
1da177e4 LT |
390 | struct tty_struct *tty; |
391 | ||
a88487c7 | 392 | tty = info->port.tty; |
1da177e4 LT |
393 | if (!tty) |
394 | return; | |
395 | #if 0 | |
396 | if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { | |
397 | tty_wakeup(tty); | |
398 | } | |
399 | #endif | |
400 | } | |
401 | ||
402 | /* | |
403 | * This routine is called from the scheduler tqueue when the interrupt | |
404 | * routine has signalled that a hangup has occurred. The path of | |
405 | * hangup processing is: | |
406 | * | |
407 | * serial interrupt routine -> (scheduler tqueue) -> | |
408 | * do_serial_hangup() -> tty->hangup() -> rs_hangup() | |
409 | * | |
410 | */ | |
931f9cde | 411 | static void do_serial_hangup(struct work_struct *work) |
1da177e4 | 412 | { |
931f9cde | 413 | struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue_hangup); |
1da177e4 LT |
414 | struct tty_struct *tty; |
415 | ||
a88487c7 | 416 | tty = info->port.tty; |
1da177e4 LT |
417 | if (!tty) |
418 | return; | |
419 | ||
420 | tty_hangup(tty); | |
421 | } | |
422 | ||
423 | ||
424 | static int startup(struct m68k_serial * info) | |
425 | { | |
426 | m68328_uart *uart = &uart_addr[info->line]; | |
427 | unsigned long flags; | |
428 | ||
429 | if (info->flags & S_INITIALIZED) | |
430 | return 0; | |
431 | ||
432 | if (!info->xmit_buf) { | |
433 | info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL); | |
434 | if (!info->xmit_buf) | |
435 | return -ENOMEM; | |
436 | } | |
437 | ||
727dda80 | 438 | local_irq_save(flags); |
1da177e4 LT |
439 | |
440 | /* | |
441 | * Clear the FIFO buffers and disable them | |
442 | * (they will be reenabled in change_speed()) | |
443 | */ | |
444 | ||
445 | uart->ustcnt = USTCNT_UEN; | |
446 | info->xmit_fifo_size = 1; | |
447 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN; | |
448 | (void)uart->urx.w; | |
449 | ||
450 | /* | |
451 | * Finally, enable sequencing and interrupts | |
452 | */ | |
453 | #ifdef USE_INTS | |
454 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | | |
455 | USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK; | |
456 | #else | |
457 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK; | |
458 | #endif | |
459 | ||
a88487c7 TI |
460 | if (info->port.tty) |
461 | clear_bit(TTY_IO_ERROR, &info->port.tty->flags); | |
1da177e4 LT |
462 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
463 | ||
464 | /* | |
465 | * and set the speed of the serial port | |
466 | */ | |
467 | ||
468 | change_speed(info); | |
469 | ||
470 | info->flags |= S_INITIALIZED; | |
727dda80 | 471 | local_irq_restore(flags); |
1da177e4 LT |
472 | return 0; |
473 | } | |
474 | ||
475 | /* | |
476 | * This routine will shutdown a serial port; interrupts are disabled, and | |
477 | * DTR is dropped if the hangup on close termio flag is on. | |
478 | */ | |
479 | static void shutdown(struct m68k_serial * info) | |
480 | { | |
481 | m68328_uart *uart = &uart_addr[info->line]; | |
482 | unsigned long flags; | |
483 | ||
484 | uart->ustcnt = 0; /* All off! */ | |
485 | if (!(info->flags & S_INITIALIZED)) | |
486 | return; | |
487 | ||
727dda80 | 488 | local_irq_save(flags); |
1da177e4 LT |
489 | |
490 | if (info->xmit_buf) { | |
491 | free_page((unsigned long) info->xmit_buf); | |
492 | info->xmit_buf = 0; | |
493 | } | |
494 | ||
a88487c7 TI |
495 | if (info->port.tty) |
496 | set_bit(TTY_IO_ERROR, &info->port.tty->flags); | |
1da177e4 LT |
497 | |
498 | info->flags &= ~S_INITIALIZED; | |
727dda80 | 499 | local_irq_restore(flags); |
1da177e4 LT |
500 | } |
501 | ||
502 | struct { | |
503 | int divisor, prescale; | |
504 | } | |
505 | #ifndef CONFIG_M68VZ328 | |
506 | hw_baud_table[18] = { | |
507 | {0,0}, /* 0 */ | |
508 | {0,0}, /* 50 */ | |
509 | {0,0}, /* 75 */ | |
510 | {0,0}, /* 110 */ | |
511 | {0,0}, /* 134 */ | |
512 | {0,0}, /* 150 */ | |
513 | {0,0}, /* 200 */ | |
514 | {7,0x26}, /* 300 */ | |
515 | {6,0x26}, /* 600 */ | |
516 | {5,0x26}, /* 1200 */ | |
517 | {0,0}, /* 1800 */ | |
518 | {4,0x26}, /* 2400 */ | |
519 | {3,0x26}, /* 4800 */ | |
520 | {2,0x26}, /* 9600 */ | |
521 | {1,0x26}, /* 19200 */ | |
522 | {0,0x26}, /* 38400 */ | |
523 | {1,0x38}, /* 57600 */ | |
524 | {0,0x38}, /* 115200 */ | |
525 | }; | |
526 | #else | |
527 | hw_baud_table[18] = { | |
528 | {0,0}, /* 0 */ | |
529 | {0,0}, /* 50 */ | |
530 | {0,0}, /* 75 */ | |
531 | {0,0}, /* 110 */ | |
532 | {0,0}, /* 134 */ | |
533 | {0,0}, /* 150 */ | |
534 | {0,0}, /* 200 */ | |
535 | {0,0}, /* 300 */ | |
536 | {7,0x26}, /* 600 */ | |
537 | {6,0x26}, /* 1200 */ | |
538 | {0,0}, /* 1800 */ | |
539 | {5,0x26}, /* 2400 */ | |
540 | {4,0x26}, /* 4800 */ | |
541 | {3,0x26}, /* 9600 */ | |
542 | {2,0x26}, /* 19200 */ | |
543 | {1,0x26}, /* 38400 */ | |
544 | {0,0x26}, /* 57600 */ | |
545 | {1,0x38}, /* 115200 */ | |
546 | }; | |
547 | #endif | |
548 | /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */ | |
549 | ||
550 | /* | |
551 | * This routine is called to set the UART divisor registers to match | |
552 | * the specified baud rate for a serial port. | |
553 | */ | |
554 | static void change_speed(struct m68k_serial *info) | |
555 | { | |
556 | m68328_uart *uart = &uart_addr[info->line]; | |
557 | unsigned short port; | |
558 | unsigned short ustcnt; | |
559 | unsigned cflag; | |
560 | int i; | |
561 | ||
a88487c7 | 562 | if (!info->port.tty || !info->port.tty->termios) |
1da177e4 | 563 | return; |
a88487c7 | 564 | cflag = info->port.tty->termios->c_cflag; |
1da177e4 LT |
565 | if (!(port = info->port)) |
566 | return; | |
567 | ||
568 | ustcnt = uart->ustcnt; | |
569 | uart->ustcnt = ustcnt & ~USTCNT_TXEN; | |
570 | ||
571 | i = cflag & CBAUD; | |
572 | if (i & CBAUDEX) { | |
573 | i = (i & ~CBAUDEX) + B38400; | |
574 | } | |
575 | ||
576 | info->baud = baud_table[i]; | |
577 | uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
578 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
579 | ||
580 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
581 | ||
582 | if ((cflag & CSIZE) == CS8) | |
583 | ustcnt |= USTCNT_8_7; | |
584 | ||
585 | if (cflag & CSTOPB) | |
586 | ustcnt |= USTCNT_STOP; | |
587 | ||
588 | if (cflag & PARENB) | |
589 | ustcnt |= USTCNT_PARITYEN; | |
590 | if (cflag & PARODD) | |
591 | ustcnt |= USTCNT_ODD_EVEN; | |
592 | ||
593 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
594 | if (cflag & CRTSCTS) { | |
595 | uart->utx.w &= ~ UTX_NOCTS; | |
596 | } else { | |
597 | uart->utx.w |= UTX_NOCTS; | |
598 | } | |
599 | #endif | |
600 | ||
601 | ustcnt |= USTCNT_TXEN; | |
602 | ||
603 | uart->ustcnt = ustcnt; | |
604 | return; | |
605 | } | |
606 | ||
607 | /* | |
608 | * Fair output driver allows a process to speak. | |
609 | */ | |
610 | static void rs_fair_output(void) | |
611 | { | |
612 | int left; /* Output no more than that */ | |
613 | unsigned long flags; | |
614 | struct m68k_serial *info = &m68k_soft[0]; | |
615 | char c; | |
616 | ||
617 | if (info == 0) return; | |
618 | if (info->xmit_buf == 0) return; | |
619 | ||
727dda80 | 620 | local_irq_save(flags); |
1da177e4 LT |
621 | left = info->xmit_cnt; |
622 | while (left != 0) { | |
623 | c = info->xmit_buf[info->xmit_tail]; | |
624 | info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1); | |
625 | info->xmit_cnt--; | |
727dda80 | 626 | local_irq_restore(flags); |
1da177e4 LT |
627 | |
628 | rs_put_char(c); | |
629 | ||
727dda80 | 630 | local_irq_save(flags); |
1da177e4 LT |
631 | left = min(info->xmit_cnt, left-1); |
632 | } | |
633 | ||
634 | /* Last character is being transmitted now (hopefully). */ | |
635 | udelay(5); | |
636 | ||
727dda80 | 637 | local_irq_restore(flags); |
1da177e4 LT |
638 | return; |
639 | } | |
640 | ||
641 | /* | |
642 | * m68k_console_print is registered for printk. | |
643 | */ | |
644 | void console_print_68328(const char *p) | |
645 | { | |
646 | char c; | |
647 | ||
648 | while((c=*(p++)) != 0) { | |
649 | if(c == '\n') | |
650 | rs_put_char('\r'); | |
651 | rs_put_char(c); | |
652 | } | |
653 | ||
654 | /* Comment this if you want to have a strict interrupt-driven output */ | |
655 | rs_fair_output(); | |
656 | ||
657 | return; | |
658 | } | |
659 | ||
660 | static void rs_set_ldisc(struct tty_struct *tty) | |
661 | { | |
662 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
663 | ||
664 | if (serial_paranoia_check(info, tty->name, "rs_set_ldisc")) | |
665 | return; | |
666 | ||
667 | info->is_cons = (tty->termios->c_line == N_TTY); | |
668 | ||
669 | printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off"); | |
670 | } | |
671 | ||
672 | static void rs_flush_chars(struct tty_struct *tty) | |
673 | { | |
674 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
675 | m68328_uart *uart = &uart_addr[info->line]; | |
676 | unsigned long flags; | |
677 | ||
678 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) | |
679 | return; | |
680 | #ifndef USE_INTS | |
681 | for(;;) { | |
682 | #endif | |
683 | ||
684 | /* Enable transmitter */ | |
727dda80 | 685 | local_irq_save(flags); |
1da177e4 LT |
686 | |
687 | if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || | |
688 | !info->xmit_buf) { | |
727dda80 | 689 | local_irq_restore(flags); |
1da177e4 LT |
690 | return; |
691 | } | |
692 | ||
693 | #ifdef USE_INTS | |
694 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
695 | #else | |
696 | uart->ustcnt |= USTCNT_TXEN; | |
697 | #endif | |
698 | ||
699 | #ifdef USE_INTS | |
700 | if (uart->utx.w & UTX_TX_AVAIL) { | |
701 | #else | |
702 | if (1) { | |
703 | #endif | |
704 | /* Send char */ | |
705 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
706 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
707 | info->xmit_cnt--; | |
708 | } | |
709 | ||
710 | #ifndef USE_INTS | |
711 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
712 | } | |
713 | #endif | |
727dda80 | 714 | local_irq_restore(flags); |
1da177e4 LT |
715 | } |
716 | ||
717 | extern void console_printn(const char * b, int count); | |
718 | ||
719 | static int rs_write(struct tty_struct * tty, | |
720 | const unsigned char *buf, int count) | |
721 | { | |
722 | int c, total = 0; | |
723 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
724 | m68328_uart *uart = &uart_addr[info->line]; | |
725 | unsigned long flags; | |
726 | ||
727 | if (serial_paranoia_check(info, tty->name, "rs_write")) | |
728 | return 0; | |
729 | ||
730 | if (!tty || !info->xmit_buf) | |
731 | return 0; | |
732 | ||
727dda80 | 733 | local_save_flags(flags); |
1da177e4 | 734 | while (1) { |
727dda80 | 735 | local_irq_disable(); |
1da177e4 LT |
736 | c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, |
737 | SERIAL_XMIT_SIZE - info->xmit_head)); | |
727dda80 GU |
738 | local_irq_restore(flags); |
739 | ||
1da177e4 LT |
740 | if (c <= 0) |
741 | break; | |
742 | ||
743 | memcpy(info->xmit_buf + info->xmit_head, buf, c); | |
727dda80 GU |
744 | |
745 | local_irq_disable(); | |
1da177e4 LT |
746 | info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); |
747 | info->xmit_cnt += c; | |
727dda80 | 748 | local_irq_restore(flags); |
1da177e4 LT |
749 | buf += c; |
750 | count -= c; | |
751 | total += c; | |
752 | } | |
753 | ||
754 | if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) { | |
755 | /* Enable transmitter */ | |
727dda80 | 756 | local_irq_disable(); |
1da177e4 LT |
757 | #ifndef USE_INTS |
758 | while(info->xmit_cnt) { | |
759 | #endif | |
760 | ||
761 | uart->ustcnt |= USTCNT_TXEN; | |
762 | #ifdef USE_INTS | |
763 | uart->ustcnt |= USTCNT_TX_INTR_MASK; | |
764 | #else | |
765 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
766 | #endif | |
767 | if (uart->utx.w & UTX_TX_AVAIL) { | |
768 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
769 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
770 | info->xmit_cnt--; | |
771 | } | |
772 | ||
773 | #ifndef USE_INTS | |
774 | } | |
775 | #endif | |
727dda80 | 776 | local_irq_restore(flags); |
1da177e4 | 777 | } |
727dda80 | 778 | |
1da177e4 LT |
779 | return total; |
780 | } | |
781 | ||
782 | static int rs_write_room(struct tty_struct *tty) | |
783 | { | |
784 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
785 | int ret; | |
786 | ||
787 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) | |
788 | return 0; | |
789 | ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; | |
790 | if (ret < 0) | |
791 | ret = 0; | |
792 | return ret; | |
793 | } | |
794 | ||
795 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
796 | { | |
797 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
798 | ||
799 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) | |
800 | return 0; | |
801 | return info->xmit_cnt; | |
802 | } | |
803 | ||
804 | static void rs_flush_buffer(struct tty_struct *tty) | |
805 | { | |
806 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
727dda80 | 807 | unsigned long flags; |
1da177e4 LT |
808 | |
809 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) | |
810 | return; | |
727dda80 | 811 | local_irq_save(flags); |
1da177e4 | 812 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
727dda80 | 813 | local_irq_restore(flags); |
1da177e4 LT |
814 | tty_wakeup(tty); |
815 | } | |
816 | ||
817 | /* | |
818 | * ------------------------------------------------------------ | |
819 | * rs_throttle() | |
820 | * | |
821 | * This routine is called by the upper-layer tty layer to signal that | |
822 | * incoming characters should be throttled. | |
823 | * ------------------------------------------------------------ | |
824 | */ | |
825 | static void rs_throttle(struct tty_struct * tty) | |
826 | { | |
827 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
828 | ||
829 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) | |
830 | return; | |
831 | ||
832 | if (I_IXOFF(tty)) | |
833 | info->x_char = STOP_CHAR(tty); | |
834 | ||
835 | /* Turn off RTS line (do this atomic) */ | |
836 | } | |
837 | ||
838 | static void rs_unthrottle(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_unthrottle")) | |
843 | return; | |
844 | ||
845 | if (I_IXOFF(tty)) { | |
846 | if (info->x_char) | |
847 | info->x_char = 0; | |
848 | else | |
849 | info->x_char = START_CHAR(tty); | |
850 | } | |
851 | ||
852 | /* Assert RTS line (do this atomic) */ | |
853 | } | |
854 | ||
855 | /* | |
856 | * ------------------------------------------------------------ | |
857 | * rs_ioctl() and friends | |
858 | * ------------------------------------------------------------ | |
859 | */ | |
860 | ||
861 | static int get_serial_info(struct m68k_serial * info, | |
862 | struct serial_struct * retinfo) | |
863 | { | |
864 | struct serial_struct tmp; | |
865 | ||
866 | if (!retinfo) | |
867 | return -EFAULT; | |
868 | memset(&tmp, 0, sizeof(tmp)); | |
869 | tmp.type = info->type; | |
870 | tmp.line = info->line; | |
871 | tmp.port = info->port; | |
872 | tmp.irq = info->irq; | |
873 | tmp.flags = info->flags; | |
874 | tmp.baud_base = info->baud_base; | |
875 | tmp.close_delay = info->close_delay; | |
876 | tmp.closing_wait = info->closing_wait; | |
877 | tmp.custom_divisor = info->custom_divisor; | |
878 | copy_to_user(retinfo,&tmp,sizeof(*retinfo)); | |
879 | return 0; | |
880 | } | |
881 | ||
882 | static int set_serial_info(struct m68k_serial * info, | |
883 | struct serial_struct * new_info) | |
884 | { | |
885 | struct serial_struct new_serial; | |
886 | struct m68k_serial old_info; | |
887 | int retval = 0; | |
888 | ||
889 | if (!new_info) | |
890 | return -EFAULT; | |
891 | copy_from_user(&new_serial,new_info,sizeof(new_serial)); | |
892 | old_info = *info; | |
893 | ||
894 | if (!capable(CAP_SYS_ADMIN)) { | |
895 | if ((new_serial.baud_base != info->baud_base) || | |
896 | (new_serial.type != info->type) || | |
897 | (new_serial.close_delay != info->close_delay) || | |
898 | ((new_serial.flags & ~S_USR_MASK) != | |
899 | (info->flags & ~S_USR_MASK))) | |
900 | return -EPERM; | |
901 | info->flags = ((info->flags & ~S_USR_MASK) | | |
902 | (new_serial.flags & S_USR_MASK)); | |
903 | info->custom_divisor = new_serial.custom_divisor; | |
904 | goto check_and_exit; | |
905 | } | |
906 | ||
907 | if (info->count > 1) | |
908 | return -EBUSY; | |
909 | ||
910 | /* | |
911 | * OK, past this point, all the error checking has been done. | |
912 | * At this point, we start making changes..... | |
913 | */ | |
914 | ||
915 | info->baud_base = new_serial.baud_base; | |
916 | info->flags = ((info->flags & ~S_FLAGS) | | |
917 | (new_serial.flags & S_FLAGS)); | |
918 | info->type = new_serial.type; | |
919 | info->close_delay = new_serial.close_delay; | |
920 | info->closing_wait = new_serial.closing_wait; | |
921 | ||
922 | check_and_exit: | |
923 | retval = startup(info); | |
924 | return retval; | |
925 | } | |
926 | ||
927 | /* | |
928 | * get_lsr_info - get line status register info | |
929 | * | |
930 | * Purpose: Let user call ioctl() to get info when the UART physically | |
931 | * is emptied. On bus types like RS485, the transmitter must | |
932 | * release the bus after transmitting. This must be done when | |
933 | * the transmit shift register is empty, not be done when the | |
934 | * transmit holding register is empty. This functionality | |
935 | * allows an RS485 driver to be written in user space. | |
936 | */ | |
937 | static int get_lsr_info(struct m68k_serial * info, unsigned int *value) | |
938 | { | |
939 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
940 | m68328_uart *uart = &uart_addr[info->line]; | |
941 | #endif | |
942 | unsigned char status; | |
727dda80 | 943 | unsigned long flags; |
1da177e4 | 944 | |
727dda80 | 945 | local_irq_save(flags); |
1da177e4 LT |
946 | #ifdef CONFIG_SERIAL_68328_RTS_CTS |
947 | status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0; | |
948 | #else | |
949 | status = 0; | |
950 | #endif | |
727dda80 | 951 | local_irq_restore(flags); |
1da177e4 LT |
952 | put_user(status,value); |
953 | return 0; | |
954 | } | |
955 | ||
956 | /* | |
957 | * This routine sends a break character out the serial port. | |
958 | */ | |
6a72c7ba | 959 | static void send_break(struct m68k_serial * info, unsigned int duration) |
1da177e4 LT |
960 | { |
961 | m68328_uart *uart = &uart_addr[info->line]; | |
962 | unsigned long flags; | |
963 | if (!info->port) | |
964 | return; | |
727dda80 | 965 | local_irq_save(flags); |
1da177e4 LT |
966 | #ifdef USE_INTS |
967 | uart->utx.w |= UTX_SEND_BREAK; | |
6a72c7ba | 968 | msleep_interruptible(duration); |
1da177e4 LT |
969 | uart->utx.w &= ~UTX_SEND_BREAK; |
970 | #endif | |
727dda80 | 971 | local_irq_restore(flags); |
1da177e4 LT |
972 | } |
973 | ||
974 | static int rs_ioctl(struct tty_struct *tty, struct file * file, | |
975 | unsigned int cmd, unsigned long arg) | |
976 | { | |
977 | int error; | |
978 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
979 | int retval; | |
980 | ||
981 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
982 | return -ENODEV; | |
983 | ||
984 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
985 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && | |
986 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { | |
987 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
988 | return -EIO; | |
989 | } | |
990 | ||
991 | switch (cmd) { | |
992 | case TCSBRK: /* SVID version: non-zero arg --> no break */ | |
993 | retval = tty_check_change(tty); | |
994 | if (retval) | |
995 | return retval; | |
996 | tty_wait_until_sent(tty, 0); | |
997 | if (!arg) | |
6a72c7ba | 998 | send_break(info, 250); /* 1/4 second */ |
1da177e4 LT |
999 | return 0; |
1000 | case TCSBRKP: /* support for POSIX tcsendbreak() */ | |
1001 | retval = tty_check_change(tty); | |
1002 | if (retval) | |
1003 | return retval; | |
1004 | tty_wait_until_sent(tty, 0); | |
6a72c7ba | 1005 | send_break(info, arg ? arg*(100) : 250); |
1da177e4 | 1006 | return 0; |
1da177e4 LT |
1007 | case TIOCGSERIAL: |
1008 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
1009 | sizeof(struct serial_struct))) | |
1010 | return get_serial_info(info, | |
1011 | (struct serial_struct *) arg); | |
1012 | return -EFAULT; | |
1013 | case TIOCSSERIAL: | |
1014 | return set_serial_info(info, | |
1015 | (struct serial_struct *) arg); | |
1016 | case TIOCSERGETLSR: /* Get line status register */ | |
1017 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
727dda80 | 1018 | sizeof(unsigned int))) |
1da177e4 LT |
1019 | return get_lsr_info(info, (unsigned int *) arg); |
1020 | return -EFAULT; | |
1021 | case TIOCSERGSTRUCT: | |
1022 | if (!access_ok(VERIFY_WRITE, (void *) arg, | |
1023 | sizeof(struct m68k_serial))) | |
1024 | return -EFAULT; | |
1025 | copy_to_user((struct m68k_serial *) arg, | |
1026 | info, sizeof(struct m68k_serial)); | |
1027 | return 0; | |
1028 | ||
1029 | default: | |
1030 | return -ENOIOCTLCMD; | |
1031 | } | |
1032 | return 0; | |
1033 | } | |
1034 | ||
606d099c | 1035 | static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
1da177e4 LT |
1036 | { |
1037 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
1038 | ||
1da177e4 LT |
1039 | change_speed(info); |
1040 | ||
1041 | if ((old_termios->c_cflag & CRTSCTS) && | |
1042 | !(tty->termios->c_cflag & CRTSCTS)) { | |
1043 | tty->hw_stopped = 0; | |
1044 | rs_start(tty); | |
1045 | } | |
1046 | ||
1047 | } | |
1048 | ||
1049 | /* | |
1050 | * ------------------------------------------------------------ | |
1051 | * rs_close() | |
1052 | * | |
1053 | * This routine is called when the serial port gets closed. First, we | |
1054 | * wait for the last remaining data to be sent. Then, we unlink its | |
1055 | * S structure from the interrupt chain if necessary, and we free | |
1056 | * that IRQ if nothing is left in the chain. | |
1057 | * ------------------------------------------------------------ | |
1058 | */ | |
1059 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
1060 | { | |
1061 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1062 | m68328_uart *uart = &uart_addr[info->line]; | |
1063 | unsigned long flags; | |
1064 | ||
1065 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) | |
1066 | return; | |
1067 | ||
727dda80 | 1068 | local_irq_save(flags); |
1da177e4 LT |
1069 | |
1070 | if (tty_hung_up_p(filp)) { | |
727dda80 | 1071 | local_irq_restore(flags); |
1da177e4 LT |
1072 | return; |
1073 | } | |
1074 | ||
1075 | if ((tty->count == 1) && (info->count != 1)) { | |
1076 | /* | |
1077 | * Uh, oh. tty->count is 1, which means that the tty | |
1078 | * structure will be freed. Info->count should always | |
1079 | * be one in these conditions. If it's greater than | |
1080 | * one, we've got real problems, since it means the | |
1081 | * serial port won't be shutdown. | |
1082 | */ | |
1083 | printk("rs_close: bad serial port count; tty->count is 1, " | |
1084 | "info->count is %d\n", info->count); | |
1085 | info->count = 1; | |
1086 | } | |
1087 | if (--info->count < 0) { | |
1088 | printk("rs_close: bad serial port count for ttyS%d: %d\n", | |
1089 | info->line, info->count); | |
1090 | info->count = 0; | |
1091 | } | |
1092 | if (info->count) { | |
727dda80 | 1093 | local_irq_restore(flags); |
1da177e4 LT |
1094 | return; |
1095 | } | |
1096 | info->flags |= S_CLOSING; | |
1097 | /* | |
1098 | * Now we wait for the transmit buffer to clear; and we notify | |
1099 | * the line discipline to only process XON/XOFF characters. | |
1100 | */ | |
1101 | tty->closing = 1; | |
1102 | if (info->closing_wait != S_CLOSING_WAIT_NONE) | |
1103 | tty_wait_until_sent(tty, info->closing_wait); | |
1104 | /* | |
1105 | * At this point we stop accepting input. To do this, we | |
1106 | * disable the receive line status interrupts, and tell the | |
1107 | * interrupt driver to stop checking the data ready bit in the | |
1108 | * line status register. | |
1109 | */ | |
1110 | ||
1111 | uart->ustcnt &= ~USTCNT_RXEN; | |
1112 | uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK); | |
1113 | ||
1114 | shutdown(info); | |
978e595f | 1115 | rs_flush_buffer(tty); |
1da177e4 LT |
1116 | |
1117 | tty_ldisc_flush(tty); | |
1118 | tty->closing = 0; | |
1119 | info->event = 0; | |
a88487c7 | 1120 | info->port.tty = NULL; |
1da177e4 LT |
1121 | #warning "This is not and has never been valid so fix it" |
1122 | #if 0 | |
1123 | if (tty->ldisc.num != ldiscs[N_TTY].num) { | |
1124 | if (tty->ldisc.close) | |
1125 | (tty->ldisc.close)(tty); | |
1126 | tty->ldisc = ldiscs[N_TTY]; | |
1127 | tty->termios->c_line = N_TTY; | |
1128 | if (tty->ldisc.open) | |
1129 | (tty->ldisc.open)(tty); | |
1130 | } | |
1131 | #endif | |
1132 | if (info->blocked_open) { | |
1133 | if (info->close_delay) { | |
1134 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); | |
1135 | } | |
1136 | wake_up_interruptible(&info->open_wait); | |
1137 | } | |
1138 | info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING); | |
1139 | wake_up_interruptible(&info->close_wait); | |
727dda80 | 1140 | local_irq_restore(flags); |
1da177e4 LT |
1141 | } |
1142 | ||
1143 | /* | |
1144 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
1145 | */ | |
1146 | void rs_hangup(struct tty_struct *tty) | |
1147 | { | |
1148 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1149 | ||
1150 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) | |
1151 | return; | |
1152 | ||
1153 | rs_flush_buffer(tty); | |
1154 | shutdown(info); | |
1155 | info->event = 0; | |
1156 | info->count = 0; | |
1157 | info->flags &= ~S_NORMAL_ACTIVE; | |
a88487c7 | 1158 | info->port.tty = NULL; |
1da177e4 LT |
1159 | wake_up_interruptible(&info->open_wait); |
1160 | } | |
1161 | ||
1162 | /* | |
1163 | * ------------------------------------------------------------ | |
1164 | * rs_open() and friends | |
1165 | * ------------------------------------------------------------ | |
1166 | */ | |
1167 | static int block_til_ready(struct tty_struct *tty, struct file * filp, | |
1168 | struct m68k_serial *info) | |
1169 | { | |
1170 | DECLARE_WAITQUEUE(wait, current); | |
1171 | int retval; | |
1172 | int do_clocal = 0; | |
1173 | ||
1174 | /* | |
1175 | * If the device is in the middle of being closed, then block | |
1176 | * until it's done, and then try again. | |
1177 | */ | |
1178 | if (info->flags & S_CLOSING) { | |
1179 | interruptible_sleep_on(&info->close_wait); | |
1180 | #ifdef SERIAL_DO_RESTART | |
1181 | if (info->flags & S_HUP_NOTIFY) | |
1182 | return -EAGAIN; | |
1183 | else | |
1184 | return -ERESTARTSYS; | |
1185 | #else | |
1186 | return -EAGAIN; | |
1187 | #endif | |
1188 | } | |
1189 | ||
1190 | /* | |
1191 | * If non-blocking mode is set, or the port is not enabled, | |
1192 | * then make the check up front and then exit. | |
1193 | */ | |
1194 | if ((filp->f_flags & O_NONBLOCK) || | |
1195 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
1196 | info->flags |= S_NORMAL_ACTIVE; | |
1197 | return 0; | |
1198 | } | |
1199 | ||
1200 | if (tty->termios->c_cflag & CLOCAL) | |
1201 | do_clocal = 1; | |
1202 | ||
1203 | /* | |
1204 | * Block waiting for the carrier detect and the line to become | |
1205 | * free (i.e., not in use by the callout). While we are in | |
1206 | * this loop, info->count is dropped by one, so that | |
1207 | * rs_close() knows when to free things. We restore it upon | |
1208 | * exit, either normal or abnormal. | |
1209 | */ | |
1210 | retval = 0; | |
1211 | add_wait_queue(&info->open_wait, &wait); | |
1212 | ||
1213 | info->count--; | |
1214 | info->blocked_open++; | |
1215 | while (1) { | |
727dda80 | 1216 | local_irq_disable(); |
1da177e4 | 1217 | m68k_rtsdtr(info, 1); |
727dda80 | 1218 | local_irq_enable(); |
1da177e4 LT |
1219 | current->state = TASK_INTERRUPTIBLE; |
1220 | if (tty_hung_up_p(filp) || | |
1221 | !(info->flags & S_INITIALIZED)) { | |
1222 | #ifdef SERIAL_DO_RESTART | |
1223 | if (info->flags & S_HUP_NOTIFY) | |
1224 | retval = -EAGAIN; | |
1225 | else | |
1226 | retval = -ERESTARTSYS; | |
1227 | #else | |
1228 | retval = -EAGAIN; | |
1229 | #endif | |
1230 | break; | |
1231 | } | |
1232 | if (!(info->flags & S_CLOSING) && do_clocal) | |
1233 | break; | |
1234 | if (signal_pending(current)) { | |
1235 | retval = -ERESTARTSYS; | |
1236 | break; | |
1237 | } | |
e142a31d | 1238 | tty_unlock(); |
1da177e4 | 1239 | schedule(); |
e142a31d | 1240 | tty_lock(); |
1da177e4 LT |
1241 | } |
1242 | current->state = TASK_RUNNING; | |
1243 | remove_wait_queue(&info->open_wait, &wait); | |
1244 | if (!tty_hung_up_p(filp)) | |
1245 | info->count++; | |
1246 | info->blocked_open--; | |
1247 | ||
1248 | if (retval) | |
1249 | return retval; | |
1250 | info->flags |= S_NORMAL_ACTIVE; | |
1251 | return 0; | |
1252 | } | |
1253 | ||
1254 | /* | |
1255 | * This routine is called whenever a serial port is opened. It | |
1256 | * enables interrupts for a serial port, linking in its S structure into | |
1257 | * the IRQ chain. It also performs the serial-specific | |
1258 | * initialization for the tty structure. | |
1259 | */ | |
1260 | int rs_open(struct tty_struct *tty, struct file * filp) | |
1261 | { | |
1262 | struct m68k_serial *info; | |
1263 | int retval, line; | |
1264 | ||
1265 | line = tty->index; | |
1266 | ||
1267 | if (line >= NR_PORTS || line < 0) /* we have exactly one */ | |
1268 | return -ENODEV; | |
1269 | ||
1270 | info = &m68k_soft[line]; | |
1271 | ||
1272 | if (serial_paranoia_check(info, tty->name, "rs_open")) | |
1273 | return -ENODEV; | |
1274 | ||
1275 | info->count++; | |
1276 | tty->driver_data = info; | |
a88487c7 | 1277 | info->port.tty = tty; |
1da177e4 LT |
1278 | |
1279 | /* | |
1280 | * Start up serial port | |
1281 | */ | |
1282 | retval = startup(info); | |
1283 | if (retval) | |
1284 | return retval; | |
1285 | ||
1286 | return block_til_ready(tty, filp, info); | |
1287 | } | |
1288 | ||
1289 | /* Finally, routines used to initialize the serial driver. */ | |
1290 | ||
1291 | static void show_serial_version(void) | |
1292 | { | |
1293 | printk("MC68328 serial driver version 1.00\n"); | |
1294 | } | |
1295 | ||
b68e31d0 | 1296 | static const struct tty_operations rs_ops = { |
1da177e4 LT |
1297 | .open = rs_open, |
1298 | .close = rs_close, | |
1299 | .write = rs_write, | |
1300 | .flush_chars = rs_flush_chars, | |
1301 | .write_room = rs_write_room, | |
1302 | .chars_in_buffer = rs_chars_in_buffer, | |
1303 | .flush_buffer = rs_flush_buffer, | |
1304 | .ioctl = rs_ioctl, | |
1305 | .throttle = rs_throttle, | |
1306 | .unthrottle = rs_unthrottle, | |
1307 | .set_termios = rs_set_termios, | |
1308 | .stop = rs_stop, | |
1309 | .start = rs_start, | |
1310 | .hangup = rs_hangup, | |
1311 | .set_ldisc = rs_set_ldisc, | |
1312 | }; | |
1313 | ||
1314 | /* rs_init inits the driver */ | |
1315 | static int __init | |
1316 | rs68328_init(void) | |
1317 | { | |
1318 | int flags, i; | |
1319 | struct m68k_serial *info; | |
1320 | ||
1321 | serial_driver = alloc_tty_driver(NR_PORTS); | |
1322 | if (!serial_driver) | |
1323 | return -ENOMEM; | |
1324 | ||
1325 | show_serial_version(); | |
1326 | ||
1327 | /* Initialize the tty_driver structure */ | |
1328 | /* SPARC: Not all of this is exactly right for us. */ | |
1329 | ||
1330 | serial_driver->name = "ttyS"; | |
1331 | serial_driver->major = TTY_MAJOR; | |
1332 | serial_driver->minor_start = 64; | |
1333 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
1334 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
1335 | serial_driver->init_termios = tty_std_termios; | |
1336 | serial_driver->init_termios.c_cflag = | |
1337 | m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL; | |
1338 | serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
1339 | tty_set_operations(serial_driver, &rs_ops); | |
1340 | ||
1341 | if (tty_register_driver(serial_driver)) { | |
1342 | put_tty_driver(serial_driver); | |
1343 | printk(KERN_ERR "Couldn't register serial driver\n"); | |
1344 | return -ENOMEM; | |
1345 | } | |
1346 | ||
727dda80 | 1347 | local_irq_save(flags); |
1da177e4 LT |
1348 | |
1349 | for(i=0;i<NR_PORTS;i++) { | |
1350 | ||
1351 | info = &m68k_soft[i]; | |
1352 | info->magic = SERIAL_MAGIC; | |
1353 | info->port = (int) &uart_addr[i]; | |
a88487c7 | 1354 | info->port.tty = NULL; |
1da177e4 LT |
1355 | info->irq = uart_irqs[i]; |
1356 | info->custom_divisor = 16; | |
1357 | info->close_delay = 50; | |
1358 | info->closing_wait = 3000; | |
1359 | info->x_char = 0; | |
1360 | info->event = 0; | |
1361 | info->count = 0; | |
1362 | info->blocked_open = 0; | |
931f9cde GU |
1363 | INIT_WORK(&info->tqueue, do_softint); |
1364 | INIT_WORK(&info->tqueue_hangup, do_serial_hangup); | |
1da177e4 LT |
1365 | init_waitqueue_head(&info->open_wait); |
1366 | init_waitqueue_head(&info->close_wait); | |
1367 | info->line = i; | |
1368 | info->is_cons = 1; /* Means shortcuts work */ | |
1369 | ||
1370 | printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line, | |
1371 | info->port, info->irq); | |
1372 | printk(" is a builtin MC68328 UART\n"); | |
1373 | ||
1da177e4 LT |
1374 | #ifdef CONFIG_M68VZ328 |
1375 | if (i > 0 ) | |
1376 | PJSEL &= 0xCF; /* PSW enable second port output */ | |
1377 | #endif | |
1378 | ||
1379 | if (request_irq(uart_irqs[i], | |
1380 | rs_interrupt, | |
7c74806b | 1381 | IRQF_DISABLED, |
25db8ad5 | 1382 | "M68328_UART", info)) |
1da177e4 | 1383 | panic("Unable to attach 68328 serial interrupt\n"); |
1da177e4 | 1384 | } |
727dda80 | 1385 | local_irq_restore(flags); |
1da177e4 LT |
1386 | return 0; |
1387 | } | |
1388 | ||
1da177e4 LT |
1389 | module_init(rs68328_init); |
1390 | ||
1391 | ||
1392 | ||
1393 | static void m68328_set_baud(void) | |
1394 | { | |
1395 | unsigned short ustcnt; | |
1396 | int i; | |
1397 | ||
1398 | ustcnt = USTCNT; | |
1399 | USTCNT = ustcnt & ~USTCNT_TXEN; | |
1400 | ||
1401 | again: | |
8b505ca8 | 1402 | for (i = 0; i < ARRAY_SIZE(baud_table); i++) |
1da177e4 LT |
1403 | if (baud_table[i] == m68328_console_baud) |
1404 | break; | |
8b505ca8 | 1405 | if (i >= ARRAY_SIZE(baud_table)) { |
1da177e4 LT |
1406 | m68328_console_baud = 9600; |
1407 | goto again; | |
1408 | } | |
1409 | ||
1410 | UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
1411 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
1412 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
1413 | ustcnt |= USTCNT_8_7; | |
1414 | ustcnt |= USTCNT_TXEN; | |
1415 | USTCNT = ustcnt; | |
1416 | m68328_console_initted = 1; | |
1417 | return; | |
1418 | } | |
1419 | ||
1420 | ||
1421 | int m68328_console_setup(struct console *cp, char *arg) | |
1422 | { | |
1423 | int i, n = CONSOLE_BAUD_RATE; | |
1424 | ||
1425 | if (!cp) | |
1426 | return(-1); | |
1427 | ||
1428 | if (arg) | |
1429 | n = simple_strtoul(arg,NULL,0); | |
1430 | ||
8b505ca8 | 1431 | for (i = 0; i < ARRAY_SIZE(baud_table); i++) |
1da177e4 LT |
1432 | if (baud_table[i] == n) |
1433 | break; | |
e9a137cb | 1434 | if (i < ARRAY_SIZE(baud_table)) { |
1da177e4 LT |
1435 | m68328_console_baud = n; |
1436 | m68328_console_cbaud = 0; | |
1437 | if (i > 15) { | |
1438 | m68328_console_cbaud |= CBAUDEX; | |
1439 | i -= 15; | |
1440 | } | |
1441 | m68328_console_cbaud |= i; | |
1442 | } | |
1443 | ||
1444 | m68328_set_baud(); /* make sure baud rate changes */ | |
1445 | return(0); | |
1446 | } | |
1447 | ||
1448 | ||
1449 | static struct tty_driver *m68328_console_device(struct console *c, int *index) | |
1450 | { | |
1451 | *index = c->index; | |
1452 | return serial_driver; | |
1453 | } | |
1454 | ||
1455 | ||
1456 | void m68328_console_write (struct console *co, const char *str, | |
1457 | unsigned int count) | |
1458 | { | |
1459 | if (!m68328_console_initted) | |
1460 | m68328_set_baud(); | |
1461 | while (count--) { | |
1462 | if (*str == '\n') | |
1463 | rs_put_char('\r'); | |
1464 | rs_put_char( *str++ ); | |
1465 | } | |
1466 | } | |
1467 | ||
1468 | ||
1469 | static struct console m68328_driver = { | |
1470 | .name = "ttyS", | |
1471 | .write = m68328_console_write, | |
1472 | .device = m68328_console_device, | |
1473 | .setup = m68328_console_setup, | |
1474 | .flags = CON_PRINTBUFFER, | |
1475 | .index = -1, | |
1476 | }; | |
1477 | ||
1478 | ||
1479 | static int __init m68328_console_init(void) | |
1480 | { | |
1481 | register_console(&m68328_driver); | |
1482 | return 0; | |
1483 | } | |
1484 | ||
1485 | console_initcall(m68328_console_init); |