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 | ||
81 | #ifdef CONFIG_CONSOLE | |
82 | extern wait_queue_head_t keypress_wait; | |
83 | #endif | |
84 | ||
85 | struct tty_driver *serial_driver; | |
86 | ||
1da177e4 LT |
87 | /* number of characters left in xmit buffer before we ask for more */ |
88 | #define WAKEUP_CHARS 256 | |
89 | ||
90 | /* Debugging... DEBUG_INTR is bad to use when one of the zs | |
91 | * lines is your console ;( | |
92 | */ | |
93 | #undef SERIAL_DEBUG_INTR | |
94 | #undef SERIAL_DEBUG_OPEN | |
95 | #undef SERIAL_DEBUG_FLOW | |
96 | ||
97 | #define RS_ISR_PASS_LIMIT 256 | |
98 | ||
1da177e4 LT |
99 | static void change_speed(struct m68k_serial *info); |
100 | ||
101 | /* | |
102 | * Setup for console. Argument comes from the boot command line. | |
103 | */ | |
104 | ||
105 | #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ) | |
106 | #define CONSOLE_BAUD_RATE 115200 | |
107 | #define DEFAULT_CBAUD B115200 | |
108 | #else | |
109 | /* (es) */ | |
110 | /* note: this is messy, but it works, again, perhaps defined somewhere else?*/ | |
111 | #ifdef CONFIG_M68VZ328 | |
112 | #define CONSOLE_BAUD_RATE 19200 | |
113 | #define DEFAULT_CBAUD B19200 | |
114 | #endif | |
115 | /* (/es) */ | |
116 | #endif | |
117 | ||
118 | #ifndef CONSOLE_BAUD_RATE | |
119 | #define CONSOLE_BAUD_RATE 9600 | |
120 | #define DEFAULT_CBAUD B9600 | |
121 | #endif | |
122 | ||
123 | ||
124 | static int m68328_console_initted = 0; | |
125 | static int m68328_console_baud = CONSOLE_BAUD_RATE; | |
126 | static int m68328_console_cbaud = DEFAULT_CBAUD; | |
127 | ||
128 | ||
1da177e4 LT |
129 | static inline int serial_paranoia_check(struct m68k_serial *info, |
130 | char *name, const char *routine) | |
131 | { | |
132 | #ifdef SERIAL_PARANOIA_CHECK | |
133 | static const char *badmagic = | |
134 | "Warning: bad magic number for serial struct %s in %s\n"; | |
135 | static const char *badinfo = | |
136 | "Warning: null m68k_serial for %s in %s\n"; | |
137 | ||
138 | if (!info) { | |
139 | printk(badinfo, name, routine); | |
140 | return 1; | |
141 | } | |
142 | if (info->magic != SERIAL_MAGIC) { | |
143 | printk(badmagic, name, routine); | |
144 | return 1; | |
145 | } | |
146 | #endif | |
147 | return 0; | |
148 | } | |
149 | ||
150 | /* | |
151 | * This is used to figure out the divisor speeds and the timeouts | |
152 | */ | |
153 | static int baud_table[] = { | |
154 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, | |
155 | 9600, 19200, 38400, 57600, 115200, 0 }; | |
156 | ||
1da177e4 LT |
157 | /* Sets or clears DTR/RTS on the requested line */ |
158 | static inline void m68k_rtsdtr(struct m68k_serial *ss, int set) | |
159 | { | |
160 | if (set) { | |
161 | /* set the RTS/CTS line */ | |
162 | } else { | |
163 | /* clear it */ | |
164 | } | |
165 | return; | |
166 | } | |
167 | ||
168 | /* Utility routines */ | |
169 | static inline int get_baud(struct m68k_serial *ss) | |
170 | { | |
171 | unsigned long result = 115200; | |
172 | unsigned short int baud = uart_addr[ss->line].ubaud; | |
173 | if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400; | |
174 | result >>= GET_FIELD(baud, UBAUD_DIVIDE); | |
175 | ||
176 | return result; | |
177 | } | |
178 | ||
179 | /* | |
180 | * ------------------------------------------------------------ | |
181 | * rs_stop() and rs_start() | |
182 | * | |
183 | * This routines are called before setting or resetting tty->stopped. | |
184 | * They enable or disable transmitter interrupts, as necessary. | |
185 | * ------------------------------------------------------------ | |
186 | */ | |
187 | static void rs_stop(struct tty_struct *tty) | |
188 | { | |
189 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
190 | m68328_uart *uart = &uart_addr[info->line]; | |
191 | unsigned long flags; | |
192 | ||
193 | if (serial_paranoia_check(info, tty->name, "rs_stop")) | |
194 | return; | |
195 | ||
727dda80 | 196 | local_irq_save(flags); |
1da177e4 | 197 | uart->ustcnt &= ~USTCNT_TXEN; |
727dda80 | 198 | local_irq_restore(flags); |
1da177e4 LT |
199 | } |
200 | ||
09a6ffa8 | 201 | static int rs_put_char(char ch) |
1da177e4 LT |
202 | { |
203 | int flags, loops = 0; | |
204 | ||
727dda80 | 205 | local_irq_save(flags); |
1da177e4 LT |
206 | |
207 | while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) { | |
208 | loops++; | |
209 | udelay(5); | |
210 | } | |
211 | ||
212 | UTX_TXDATA = ch; | |
213 | udelay(5); | |
727dda80 | 214 | local_irq_restore(flags); |
09a6ffa8 | 215 | return 1; |
1da177e4 LT |
216 | } |
217 | ||
218 | static void rs_start(struct tty_struct *tty) | |
219 | { | |
220 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
221 | m68328_uart *uart = &uart_addr[info->line]; | |
222 | unsigned long flags; | |
223 | ||
224 | if (serial_paranoia_check(info, tty->name, "rs_start")) | |
225 | return; | |
226 | ||
727dda80 | 227 | local_irq_save(flags); |
1da177e4 LT |
228 | if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) { |
229 | #ifdef USE_INTS | |
230 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
231 | #else | |
232 | uart->ustcnt |= USTCNT_TXEN; | |
233 | #endif | |
234 | } | |
727dda80 | 235 | local_irq_restore(flags); |
1da177e4 LT |
236 | } |
237 | ||
238 | /* Drop into either the boot monitor or kadb upon receiving a break | |
239 | * from keyboard/console input. | |
240 | */ | |
241 | static void batten_down_hatches(void) | |
242 | { | |
243 | /* Drop into the debugger */ | |
244 | } | |
245 | ||
41c28ff1 | 246 | static void status_handle(struct m68k_serial *info, unsigned short status) |
1da177e4 LT |
247 | { |
248 | #if 0 | |
249 | if(status & DCD) { | |
a88487c7 | 250 | if((info->port.tty->termios->c_cflag & CRTSCTS) && |
1da177e4 LT |
251 | ((info->curregs[3] & AUTO_ENAB)==0)) { |
252 | info->curregs[3] |= AUTO_ENAB; | |
253 | info->pendregs[3] |= AUTO_ENAB; | |
254 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
255 | } | |
256 | } else { | |
257 | if((info->curregs[3] & AUTO_ENAB)) { | |
258 | info->curregs[3] &= ~AUTO_ENAB; | |
259 | info->pendregs[3] &= ~AUTO_ENAB; | |
260 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
261 | } | |
262 | } | |
263 | #endif | |
264 | /* If this is console input and this is a | |
265 | * 'break asserted' status change interrupt | |
266 | * see if we can drop into the debugger | |
267 | */ | |
268 | if((status & URX_BREAK) && info->break_abort) | |
269 | batten_down_hatches(); | |
270 | return; | |
271 | } | |
272 | ||
7d12e780 | 273 | static void receive_chars(struct m68k_serial *info, unsigned short rx) |
1da177e4 | 274 | { |
a88487c7 | 275 | struct tty_struct *tty = info->port.tty; |
1da177e4 | 276 | m68328_uart *uart = &uart_addr[info->line]; |
33f0f88f | 277 | unsigned char ch, flag; |
1da177e4 LT |
278 | |
279 | /* | |
280 | * This do { } while() loop will get ALL chars out of Rx FIFO | |
281 | */ | |
282 | #ifndef CONFIG_XCOPILOT_BUGS | |
283 | do { | |
284 | #endif | |
285 | ch = GET_FIELD(rx, URX_RXDATA); | |
286 | ||
287 | if(info->is_cons) { | |
288 | if(URX_BREAK & rx) { /* whee, break received */ | |
289 | status_handle(info, rx); | |
290 | return; | |
291 | #ifdef CONFIG_MAGIC_SYSRQ | |
292 | } else if (ch == 0x10) { /* ^P */ | |
293 | show_state(); | |
294 | show_free_areas(); | |
295 | show_buffers(); | |
296 | /* show_net_buffers(); */ | |
297 | return; | |
298 | } else if (ch == 0x12) { /* ^R */ | |
804ebf46 | 299 | emergency_restart(); |
1da177e4 LT |
300 | return; |
301 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
302 | } | |
303 | /* It is a 'keyboard interrupt' ;-) */ | |
304 | #ifdef CONFIG_CONSOLE | |
305 | wake_up(&keypress_wait); | |
306 | #endif | |
307 | } | |
308 | ||
309 | if(!tty) | |
310 | goto clear_and_exit; | |
311 | ||
33f0f88f AC |
312 | flag = TTY_NORMAL; |
313 | ||
1da177e4 | 314 | if(rx & URX_PARITY_ERROR) { |
33f0f88f | 315 | flag = TTY_PARITY; |
1da177e4 LT |
316 | status_handle(info, rx); |
317 | } else if(rx & URX_OVRUN) { | |
33f0f88f | 318 | flag = TTY_OVERRUN; |
1da177e4 LT |
319 | status_handle(info, rx); |
320 | } else if(rx & URX_FRAME_ERROR) { | |
33f0f88f | 321 | flag = TTY_FRAME; |
1da177e4 | 322 | status_handle(info, rx); |
1da177e4 | 323 | } |
33f0f88f | 324 | tty_insert_flip_char(tty, ch, flag); |
1da177e4 LT |
325 | #ifndef CONFIG_XCOPILOT_BUGS |
326 | } while((rx = uart->urx.w) & URX_DATA_READY); | |
327 | #endif | |
328 | ||
8e63e66b | 329 | tty_schedule_flip(tty); |
1da177e4 LT |
330 | |
331 | clear_and_exit: | |
332 | return; | |
333 | } | |
334 | ||
41c28ff1 | 335 | static void transmit_chars(struct m68k_serial *info) |
1da177e4 LT |
336 | { |
337 | m68328_uart *uart = &uart_addr[info->line]; | |
338 | ||
339 | if (info->x_char) { | |
340 | /* Send next char */ | |
341 | uart->utx.b.txdata = info->x_char; | |
342 | info->x_char = 0; | |
343 | goto clear_and_return; | |
344 | } | |
345 | ||
a88487c7 | 346 | if((info->xmit_cnt <= 0) || info->port.tty->stopped) { |
1da177e4 LT |
347 | /* That's peculiar... TX ints off */ |
348 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
349 | goto clear_and_return; | |
350 | } | |
351 | ||
352 | /* Send char */ | |
353 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
354 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
355 | info->xmit_cnt--; | |
356 | ||
357 | if (info->xmit_cnt < WAKEUP_CHARS) | |
358 | schedule_work(&info->tqueue); | |
359 | ||
360 | if(info->xmit_cnt <= 0) { | |
361 | /* All done for now... TX ints off */ | |
362 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
363 | goto clear_and_return; | |
364 | } | |
365 | ||
366 | clear_and_return: | |
367 | /* Clear interrupt (should be auto)*/ | |
368 | return; | |
369 | } | |
370 | ||
371 | /* | |
372 | * This is the serial driver's generic interrupt routine | |
373 | */ | |
7d12e780 | 374 | irqreturn_t rs_interrupt(int irq, void *dev_id) |
1da177e4 | 375 | { |
25db8ad5 | 376 | struct m68k_serial *info = dev_id; |
1da177e4 LT |
377 | m68328_uart *uart; |
378 | unsigned short rx; | |
379 | unsigned short tx; | |
380 | ||
1da177e4 LT |
381 | uart = &uart_addr[info->line]; |
382 | rx = uart->urx.w; | |
383 | ||
384 | #ifdef USE_INTS | |
385 | tx = uart->utx.w; | |
386 | ||
7d12e780 | 387 | if (rx & URX_DATA_READY) receive_chars(info, rx); |
1da177e4 LT |
388 | if (tx & UTX_TX_AVAIL) transmit_chars(info); |
389 | #else | |
7d12e780 | 390 | receive_chars(info, rx); |
1da177e4 LT |
391 | #endif |
392 | return IRQ_HANDLED; | |
393 | } | |
394 | ||
931f9cde | 395 | static void do_softint(struct work_struct *work) |
1da177e4 | 396 | { |
931f9cde | 397 | struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue); |
1da177e4 LT |
398 | struct tty_struct *tty; |
399 | ||
a88487c7 | 400 | tty = info->port.tty; |
1da177e4 LT |
401 | if (!tty) |
402 | return; | |
403 | #if 0 | |
404 | if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { | |
405 | tty_wakeup(tty); | |
406 | } | |
407 | #endif | |
408 | } | |
409 | ||
410 | /* | |
411 | * This routine is called from the scheduler tqueue when the interrupt | |
412 | * routine has signalled that a hangup has occurred. The path of | |
413 | * hangup processing is: | |
414 | * | |
415 | * serial interrupt routine -> (scheduler tqueue) -> | |
416 | * do_serial_hangup() -> tty->hangup() -> rs_hangup() | |
417 | * | |
418 | */ | |
931f9cde | 419 | static void do_serial_hangup(struct work_struct *work) |
1da177e4 | 420 | { |
931f9cde | 421 | struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue_hangup); |
1da177e4 LT |
422 | struct tty_struct *tty; |
423 | ||
a88487c7 | 424 | tty = info->port.tty; |
1da177e4 LT |
425 | if (!tty) |
426 | return; | |
427 | ||
428 | tty_hangup(tty); | |
429 | } | |
430 | ||
431 | ||
432 | static int startup(struct m68k_serial * info) | |
433 | { | |
434 | m68328_uart *uart = &uart_addr[info->line]; | |
435 | unsigned long flags; | |
436 | ||
437 | if (info->flags & S_INITIALIZED) | |
438 | return 0; | |
439 | ||
440 | if (!info->xmit_buf) { | |
441 | info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL); | |
442 | if (!info->xmit_buf) | |
443 | return -ENOMEM; | |
444 | } | |
445 | ||
727dda80 | 446 | local_irq_save(flags); |
1da177e4 LT |
447 | |
448 | /* | |
449 | * Clear the FIFO buffers and disable them | |
450 | * (they will be reenabled in change_speed()) | |
451 | */ | |
452 | ||
453 | uart->ustcnt = USTCNT_UEN; | |
454 | info->xmit_fifo_size = 1; | |
455 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN; | |
456 | (void)uart->urx.w; | |
457 | ||
458 | /* | |
459 | * Finally, enable sequencing and interrupts | |
460 | */ | |
461 | #ifdef USE_INTS | |
462 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | | |
463 | USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK; | |
464 | #else | |
465 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK; | |
466 | #endif | |
467 | ||
a88487c7 TI |
468 | if (info->port.tty) |
469 | clear_bit(TTY_IO_ERROR, &info->port.tty->flags); | |
1da177e4 LT |
470 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
471 | ||
472 | /* | |
473 | * and set the speed of the serial port | |
474 | */ | |
475 | ||
476 | change_speed(info); | |
477 | ||
478 | info->flags |= S_INITIALIZED; | |
727dda80 | 479 | local_irq_restore(flags); |
1da177e4 LT |
480 | return 0; |
481 | } | |
482 | ||
483 | /* | |
484 | * This routine will shutdown a serial port; interrupts are disabled, and | |
485 | * DTR is dropped if the hangup on close termio flag is on. | |
486 | */ | |
487 | static void shutdown(struct m68k_serial * info) | |
488 | { | |
489 | m68328_uart *uart = &uart_addr[info->line]; | |
490 | unsigned long flags; | |
491 | ||
492 | uart->ustcnt = 0; /* All off! */ | |
493 | if (!(info->flags & S_INITIALIZED)) | |
494 | return; | |
495 | ||
727dda80 | 496 | local_irq_save(flags); |
1da177e4 LT |
497 | |
498 | if (info->xmit_buf) { | |
499 | free_page((unsigned long) info->xmit_buf); | |
500 | info->xmit_buf = 0; | |
501 | } | |
502 | ||
a88487c7 TI |
503 | if (info->port.tty) |
504 | set_bit(TTY_IO_ERROR, &info->port.tty->flags); | |
1da177e4 LT |
505 | |
506 | info->flags &= ~S_INITIALIZED; | |
727dda80 | 507 | local_irq_restore(flags); |
1da177e4 LT |
508 | } |
509 | ||
510 | struct { | |
511 | int divisor, prescale; | |
512 | } | |
513 | #ifndef CONFIG_M68VZ328 | |
514 | hw_baud_table[18] = { | |
515 | {0,0}, /* 0 */ | |
516 | {0,0}, /* 50 */ | |
517 | {0,0}, /* 75 */ | |
518 | {0,0}, /* 110 */ | |
519 | {0,0}, /* 134 */ | |
520 | {0,0}, /* 150 */ | |
521 | {0,0}, /* 200 */ | |
522 | {7,0x26}, /* 300 */ | |
523 | {6,0x26}, /* 600 */ | |
524 | {5,0x26}, /* 1200 */ | |
525 | {0,0}, /* 1800 */ | |
526 | {4,0x26}, /* 2400 */ | |
527 | {3,0x26}, /* 4800 */ | |
528 | {2,0x26}, /* 9600 */ | |
529 | {1,0x26}, /* 19200 */ | |
530 | {0,0x26}, /* 38400 */ | |
531 | {1,0x38}, /* 57600 */ | |
532 | {0,0x38}, /* 115200 */ | |
533 | }; | |
534 | #else | |
535 | hw_baud_table[18] = { | |
536 | {0,0}, /* 0 */ | |
537 | {0,0}, /* 50 */ | |
538 | {0,0}, /* 75 */ | |
539 | {0,0}, /* 110 */ | |
540 | {0,0}, /* 134 */ | |
541 | {0,0}, /* 150 */ | |
542 | {0,0}, /* 200 */ | |
543 | {0,0}, /* 300 */ | |
544 | {7,0x26}, /* 600 */ | |
545 | {6,0x26}, /* 1200 */ | |
546 | {0,0}, /* 1800 */ | |
547 | {5,0x26}, /* 2400 */ | |
548 | {4,0x26}, /* 4800 */ | |
549 | {3,0x26}, /* 9600 */ | |
550 | {2,0x26}, /* 19200 */ | |
551 | {1,0x26}, /* 38400 */ | |
552 | {0,0x26}, /* 57600 */ | |
553 | {1,0x38}, /* 115200 */ | |
554 | }; | |
555 | #endif | |
556 | /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */ | |
557 | ||
558 | /* | |
559 | * This routine is called to set the UART divisor registers to match | |
560 | * the specified baud rate for a serial port. | |
561 | */ | |
562 | static void change_speed(struct m68k_serial *info) | |
563 | { | |
564 | m68328_uart *uart = &uart_addr[info->line]; | |
565 | unsigned short port; | |
566 | unsigned short ustcnt; | |
567 | unsigned cflag; | |
568 | int i; | |
569 | ||
a88487c7 | 570 | if (!info->port.tty || !info->port.tty->termios) |
1da177e4 | 571 | return; |
a88487c7 | 572 | cflag = info->port.tty->termios->c_cflag; |
1da177e4 LT |
573 | if (!(port = info->port)) |
574 | return; | |
575 | ||
576 | ustcnt = uart->ustcnt; | |
577 | uart->ustcnt = ustcnt & ~USTCNT_TXEN; | |
578 | ||
579 | i = cflag & CBAUD; | |
580 | if (i & CBAUDEX) { | |
581 | i = (i & ~CBAUDEX) + B38400; | |
582 | } | |
583 | ||
584 | info->baud = baud_table[i]; | |
585 | uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
586 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
587 | ||
588 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
589 | ||
590 | if ((cflag & CSIZE) == CS8) | |
591 | ustcnt |= USTCNT_8_7; | |
592 | ||
593 | if (cflag & CSTOPB) | |
594 | ustcnt |= USTCNT_STOP; | |
595 | ||
596 | if (cflag & PARENB) | |
597 | ustcnt |= USTCNT_PARITYEN; | |
598 | if (cflag & PARODD) | |
599 | ustcnt |= USTCNT_ODD_EVEN; | |
600 | ||
601 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
602 | if (cflag & CRTSCTS) { | |
603 | uart->utx.w &= ~ UTX_NOCTS; | |
604 | } else { | |
605 | uart->utx.w |= UTX_NOCTS; | |
606 | } | |
607 | #endif | |
608 | ||
609 | ustcnt |= USTCNT_TXEN; | |
610 | ||
611 | uart->ustcnt = ustcnt; | |
612 | return; | |
613 | } | |
614 | ||
615 | /* | |
616 | * Fair output driver allows a process to speak. | |
617 | */ | |
618 | static void rs_fair_output(void) | |
619 | { | |
620 | int left; /* Output no more than that */ | |
621 | unsigned long flags; | |
622 | struct m68k_serial *info = &m68k_soft[0]; | |
623 | char c; | |
624 | ||
625 | if (info == 0) return; | |
626 | if (info->xmit_buf == 0) return; | |
627 | ||
727dda80 | 628 | local_irq_save(flags); |
1da177e4 LT |
629 | left = info->xmit_cnt; |
630 | while (left != 0) { | |
631 | c = info->xmit_buf[info->xmit_tail]; | |
632 | info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1); | |
633 | info->xmit_cnt--; | |
727dda80 | 634 | local_irq_restore(flags); |
1da177e4 LT |
635 | |
636 | rs_put_char(c); | |
637 | ||
727dda80 | 638 | local_irq_save(flags); |
1da177e4 LT |
639 | left = min(info->xmit_cnt, left-1); |
640 | } | |
641 | ||
642 | /* Last character is being transmitted now (hopefully). */ | |
643 | udelay(5); | |
644 | ||
727dda80 | 645 | local_irq_restore(flags); |
1da177e4 LT |
646 | return; |
647 | } | |
648 | ||
649 | /* | |
650 | * m68k_console_print is registered for printk. | |
651 | */ | |
652 | void console_print_68328(const char *p) | |
653 | { | |
654 | char c; | |
655 | ||
656 | while((c=*(p++)) != 0) { | |
657 | if(c == '\n') | |
658 | rs_put_char('\r'); | |
659 | rs_put_char(c); | |
660 | } | |
661 | ||
662 | /* Comment this if you want to have a strict interrupt-driven output */ | |
663 | rs_fair_output(); | |
664 | ||
665 | return; | |
666 | } | |
667 | ||
668 | static void rs_set_ldisc(struct tty_struct *tty) | |
669 | { | |
670 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
671 | ||
672 | if (serial_paranoia_check(info, tty->name, "rs_set_ldisc")) | |
673 | return; | |
674 | ||
675 | info->is_cons = (tty->termios->c_line == N_TTY); | |
676 | ||
677 | printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off"); | |
678 | } | |
679 | ||
680 | static void rs_flush_chars(struct tty_struct *tty) | |
681 | { | |
682 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
683 | m68328_uart *uart = &uart_addr[info->line]; | |
684 | unsigned long flags; | |
685 | ||
686 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) | |
687 | return; | |
688 | #ifndef USE_INTS | |
689 | for(;;) { | |
690 | #endif | |
691 | ||
692 | /* Enable transmitter */ | |
727dda80 | 693 | local_irq_save(flags); |
1da177e4 LT |
694 | |
695 | if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || | |
696 | !info->xmit_buf) { | |
727dda80 | 697 | local_irq_restore(flags); |
1da177e4 LT |
698 | return; |
699 | } | |
700 | ||
701 | #ifdef USE_INTS | |
702 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
703 | #else | |
704 | uart->ustcnt |= USTCNT_TXEN; | |
705 | #endif | |
706 | ||
707 | #ifdef USE_INTS | |
708 | if (uart->utx.w & UTX_TX_AVAIL) { | |
709 | #else | |
710 | if (1) { | |
711 | #endif | |
712 | /* Send char */ | |
713 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
714 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
715 | info->xmit_cnt--; | |
716 | } | |
717 | ||
718 | #ifndef USE_INTS | |
719 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
720 | } | |
721 | #endif | |
727dda80 | 722 | local_irq_restore(flags); |
1da177e4 LT |
723 | } |
724 | ||
725 | extern void console_printn(const char * b, int count); | |
726 | ||
727 | static int rs_write(struct tty_struct * tty, | |
728 | const unsigned char *buf, int count) | |
729 | { | |
730 | int c, total = 0; | |
731 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
732 | m68328_uart *uart = &uart_addr[info->line]; | |
733 | unsigned long flags; | |
734 | ||
735 | if (serial_paranoia_check(info, tty->name, "rs_write")) | |
736 | return 0; | |
737 | ||
738 | if (!tty || !info->xmit_buf) | |
739 | return 0; | |
740 | ||
727dda80 | 741 | local_save_flags(flags); |
1da177e4 | 742 | while (1) { |
727dda80 | 743 | local_irq_disable(); |
1da177e4 LT |
744 | c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, |
745 | SERIAL_XMIT_SIZE - info->xmit_head)); | |
727dda80 GU |
746 | local_irq_restore(flags); |
747 | ||
1da177e4 LT |
748 | if (c <= 0) |
749 | break; | |
750 | ||
751 | memcpy(info->xmit_buf + info->xmit_head, buf, c); | |
727dda80 GU |
752 | |
753 | local_irq_disable(); | |
1da177e4 LT |
754 | info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); |
755 | info->xmit_cnt += c; | |
727dda80 | 756 | local_irq_restore(flags); |
1da177e4 LT |
757 | buf += c; |
758 | count -= c; | |
759 | total += c; | |
760 | } | |
761 | ||
762 | if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) { | |
763 | /* Enable transmitter */ | |
727dda80 | 764 | local_irq_disable(); |
1da177e4 LT |
765 | #ifndef USE_INTS |
766 | while(info->xmit_cnt) { | |
767 | #endif | |
768 | ||
769 | uart->ustcnt |= USTCNT_TXEN; | |
770 | #ifdef USE_INTS | |
771 | uart->ustcnt |= USTCNT_TX_INTR_MASK; | |
772 | #else | |
773 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
774 | #endif | |
775 | if (uart->utx.w & UTX_TX_AVAIL) { | |
776 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
777 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
778 | info->xmit_cnt--; | |
779 | } | |
780 | ||
781 | #ifndef USE_INTS | |
782 | } | |
783 | #endif | |
727dda80 | 784 | local_irq_restore(flags); |
1da177e4 | 785 | } |
727dda80 | 786 | |
1da177e4 LT |
787 | return total; |
788 | } | |
789 | ||
790 | static int rs_write_room(struct tty_struct *tty) | |
791 | { | |
792 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
793 | int ret; | |
794 | ||
795 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) | |
796 | return 0; | |
797 | ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; | |
798 | if (ret < 0) | |
799 | ret = 0; | |
800 | return ret; | |
801 | } | |
802 | ||
803 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
804 | { | |
805 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
806 | ||
807 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) | |
808 | return 0; | |
809 | return info->xmit_cnt; | |
810 | } | |
811 | ||
812 | static void rs_flush_buffer(struct tty_struct *tty) | |
813 | { | |
814 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
727dda80 | 815 | unsigned long flags; |
1da177e4 LT |
816 | |
817 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) | |
818 | return; | |
727dda80 | 819 | local_irq_save(flags); |
1da177e4 | 820 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
727dda80 | 821 | local_irq_restore(flags); |
1da177e4 LT |
822 | tty_wakeup(tty); |
823 | } | |
824 | ||
825 | /* | |
826 | * ------------------------------------------------------------ | |
827 | * rs_throttle() | |
828 | * | |
829 | * This routine is called by the upper-layer tty layer to signal that | |
830 | * incoming characters should be throttled. | |
831 | * ------------------------------------------------------------ | |
832 | */ | |
833 | static void rs_throttle(struct tty_struct * tty) | |
834 | { | |
835 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
836 | ||
837 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) | |
838 | return; | |
839 | ||
840 | if (I_IXOFF(tty)) | |
841 | info->x_char = STOP_CHAR(tty); | |
842 | ||
843 | /* Turn off RTS line (do this atomic) */ | |
844 | } | |
845 | ||
846 | static void rs_unthrottle(struct tty_struct * tty) | |
847 | { | |
848 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
849 | ||
850 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) | |
851 | return; | |
852 | ||
853 | if (I_IXOFF(tty)) { | |
854 | if (info->x_char) | |
855 | info->x_char = 0; | |
856 | else | |
857 | info->x_char = START_CHAR(tty); | |
858 | } | |
859 | ||
860 | /* Assert RTS line (do this atomic) */ | |
861 | } | |
862 | ||
863 | /* | |
864 | * ------------------------------------------------------------ | |
865 | * rs_ioctl() and friends | |
866 | * ------------------------------------------------------------ | |
867 | */ | |
868 | ||
869 | static int get_serial_info(struct m68k_serial * info, | |
870 | struct serial_struct * retinfo) | |
871 | { | |
872 | struct serial_struct tmp; | |
873 | ||
874 | if (!retinfo) | |
875 | return -EFAULT; | |
876 | memset(&tmp, 0, sizeof(tmp)); | |
877 | tmp.type = info->type; | |
878 | tmp.line = info->line; | |
879 | tmp.port = info->port; | |
880 | tmp.irq = info->irq; | |
881 | tmp.flags = info->flags; | |
882 | tmp.baud_base = info->baud_base; | |
883 | tmp.close_delay = info->close_delay; | |
884 | tmp.closing_wait = info->closing_wait; | |
885 | tmp.custom_divisor = info->custom_divisor; | |
886 | copy_to_user(retinfo,&tmp,sizeof(*retinfo)); | |
887 | return 0; | |
888 | } | |
889 | ||
890 | static int set_serial_info(struct m68k_serial * info, | |
891 | struct serial_struct * new_info) | |
892 | { | |
893 | struct serial_struct new_serial; | |
894 | struct m68k_serial old_info; | |
895 | int retval = 0; | |
896 | ||
897 | if (!new_info) | |
898 | return -EFAULT; | |
899 | copy_from_user(&new_serial,new_info,sizeof(new_serial)); | |
900 | old_info = *info; | |
901 | ||
902 | if (!capable(CAP_SYS_ADMIN)) { | |
903 | if ((new_serial.baud_base != info->baud_base) || | |
904 | (new_serial.type != info->type) || | |
905 | (new_serial.close_delay != info->close_delay) || | |
906 | ((new_serial.flags & ~S_USR_MASK) != | |
907 | (info->flags & ~S_USR_MASK))) | |
908 | return -EPERM; | |
909 | info->flags = ((info->flags & ~S_USR_MASK) | | |
910 | (new_serial.flags & S_USR_MASK)); | |
911 | info->custom_divisor = new_serial.custom_divisor; | |
912 | goto check_and_exit; | |
913 | } | |
914 | ||
915 | if (info->count > 1) | |
916 | return -EBUSY; | |
917 | ||
918 | /* | |
919 | * OK, past this point, all the error checking has been done. | |
920 | * At this point, we start making changes..... | |
921 | */ | |
922 | ||
923 | info->baud_base = new_serial.baud_base; | |
924 | info->flags = ((info->flags & ~S_FLAGS) | | |
925 | (new_serial.flags & S_FLAGS)); | |
926 | info->type = new_serial.type; | |
927 | info->close_delay = new_serial.close_delay; | |
928 | info->closing_wait = new_serial.closing_wait; | |
929 | ||
930 | check_and_exit: | |
931 | retval = startup(info); | |
932 | return retval; | |
933 | } | |
934 | ||
935 | /* | |
936 | * get_lsr_info - get line status register info | |
937 | * | |
938 | * Purpose: Let user call ioctl() to get info when the UART physically | |
939 | * is emptied. On bus types like RS485, the transmitter must | |
940 | * release the bus after transmitting. This must be done when | |
941 | * the transmit shift register is empty, not be done when the | |
942 | * transmit holding register is empty. This functionality | |
943 | * allows an RS485 driver to be written in user space. | |
944 | */ | |
945 | static int get_lsr_info(struct m68k_serial * info, unsigned int *value) | |
946 | { | |
947 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
948 | m68328_uart *uart = &uart_addr[info->line]; | |
949 | #endif | |
950 | unsigned char status; | |
727dda80 | 951 | unsigned long flags; |
1da177e4 | 952 | |
727dda80 | 953 | local_irq_save(flags); |
1da177e4 LT |
954 | #ifdef CONFIG_SERIAL_68328_RTS_CTS |
955 | status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0; | |
956 | #else | |
957 | status = 0; | |
958 | #endif | |
727dda80 | 959 | local_irq_restore(flags); |
1da177e4 LT |
960 | put_user(status,value); |
961 | return 0; | |
962 | } | |
963 | ||
964 | /* | |
965 | * This routine sends a break character out the serial port. | |
966 | */ | |
6a72c7ba | 967 | static void send_break(struct m68k_serial * info, unsigned int duration) |
1da177e4 LT |
968 | { |
969 | m68328_uart *uart = &uart_addr[info->line]; | |
970 | unsigned long flags; | |
971 | if (!info->port) | |
972 | return; | |
727dda80 | 973 | local_irq_save(flags); |
1da177e4 LT |
974 | #ifdef USE_INTS |
975 | uart->utx.w |= UTX_SEND_BREAK; | |
6a72c7ba | 976 | msleep_interruptible(duration); |
1da177e4 LT |
977 | uart->utx.w &= ~UTX_SEND_BREAK; |
978 | #endif | |
727dda80 | 979 | local_irq_restore(flags); |
1da177e4 LT |
980 | } |
981 | ||
982 | static int rs_ioctl(struct tty_struct *tty, struct file * file, | |
983 | unsigned int cmd, unsigned long arg) | |
984 | { | |
985 | int error; | |
986 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
987 | int retval; | |
988 | ||
989 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
990 | return -ENODEV; | |
991 | ||
992 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
993 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && | |
994 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { | |
995 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
996 | return -EIO; | |
997 | } | |
998 | ||
999 | switch (cmd) { | |
1000 | case TCSBRK: /* SVID version: non-zero arg --> no break */ | |
1001 | retval = tty_check_change(tty); | |
1002 | if (retval) | |
1003 | return retval; | |
1004 | tty_wait_until_sent(tty, 0); | |
1005 | if (!arg) | |
6a72c7ba | 1006 | send_break(info, 250); /* 1/4 second */ |
1da177e4 LT |
1007 | return 0; |
1008 | case TCSBRKP: /* support for POSIX tcsendbreak() */ | |
1009 | retval = tty_check_change(tty); | |
1010 | if (retval) | |
1011 | return retval; | |
1012 | tty_wait_until_sent(tty, 0); | |
6a72c7ba | 1013 | send_break(info, arg ? arg*(100) : 250); |
1da177e4 | 1014 | return 0; |
1da177e4 LT |
1015 | case TIOCGSERIAL: |
1016 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
1017 | sizeof(struct serial_struct))) | |
1018 | return get_serial_info(info, | |
1019 | (struct serial_struct *) arg); | |
1020 | return -EFAULT; | |
1021 | case TIOCSSERIAL: | |
1022 | return set_serial_info(info, | |
1023 | (struct serial_struct *) arg); | |
1024 | case TIOCSERGETLSR: /* Get line status register */ | |
1025 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
727dda80 | 1026 | sizeof(unsigned int))) |
1da177e4 LT |
1027 | return get_lsr_info(info, (unsigned int *) arg); |
1028 | return -EFAULT; | |
1029 | case TIOCSERGSTRUCT: | |
1030 | if (!access_ok(VERIFY_WRITE, (void *) arg, | |
1031 | sizeof(struct m68k_serial))) | |
1032 | return -EFAULT; | |
1033 | copy_to_user((struct m68k_serial *) arg, | |
1034 | info, sizeof(struct m68k_serial)); | |
1035 | return 0; | |
1036 | ||
1037 | default: | |
1038 | return -ENOIOCTLCMD; | |
1039 | } | |
1040 | return 0; | |
1041 | } | |
1042 | ||
606d099c | 1043 | static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
1da177e4 LT |
1044 | { |
1045 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
1046 | ||
1da177e4 LT |
1047 | change_speed(info); |
1048 | ||
1049 | if ((old_termios->c_cflag & CRTSCTS) && | |
1050 | !(tty->termios->c_cflag & CRTSCTS)) { | |
1051 | tty->hw_stopped = 0; | |
1052 | rs_start(tty); | |
1053 | } | |
1054 | ||
1055 | } | |
1056 | ||
1057 | /* | |
1058 | * ------------------------------------------------------------ | |
1059 | * rs_close() | |
1060 | * | |
1061 | * This routine is called when the serial port gets closed. First, we | |
1062 | * wait for the last remaining data to be sent. Then, we unlink its | |
1063 | * S structure from the interrupt chain if necessary, and we free | |
1064 | * that IRQ if nothing is left in the chain. | |
1065 | * ------------------------------------------------------------ | |
1066 | */ | |
1067 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
1068 | { | |
1069 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1070 | m68328_uart *uart = &uart_addr[info->line]; | |
1071 | unsigned long flags; | |
1072 | ||
1073 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) | |
1074 | return; | |
1075 | ||
727dda80 | 1076 | local_irq_save(flags); |
1da177e4 LT |
1077 | |
1078 | if (tty_hung_up_p(filp)) { | |
727dda80 | 1079 | local_irq_restore(flags); |
1da177e4 LT |
1080 | return; |
1081 | } | |
1082 | ||
1083 | if ((tty->count == 1) && (info->count != 1)) { | |
1084 | /* | |
1085 | * Uh, oh. tty->count is 1, which means that the tty | |
1086 | * structure will be freed. Info->count should always | |
1087 | * be one in these conditions. If it's greater than | |
1088 | * one, we've got real problems, since it means the | |
1089 | * serial port won't be shutdown. | |
1090 | */ | |
1091 | printk("rs_close: bad serial port count; tty->count is 1, " | |
1092 | "info->count is %d\n", info->count); | |
1093 | info->count = 1; | |
1094 | } | |
1095 | if (--info->count < 0) { | |
1096 | printk("rs_close: bad serial port count for ttyS%d: %d\n", | |
1097 | info->line, info->count); | |
1098 | info->count = 0; | |
1099 | } | |
1100 | if (info->count) { | |
727dda80 | 1101 | local_irq_restore(flags); |
1da177e4 LT |
1102 | return; |
1103 | } | |
1104 | info->flags |= S_CLOSING; | |
1105 | /* | |
1106 | * Now we wait for the transmit buffer to clear; and we notify | |
1107 | * the line discipline to only process XON/XOFF characters. | |
1108 | */ | |
1109 | tty->closing = 1; | |
1110 | if (info->closing_wait != S_CLOSING_WAIT_NONE) | |
1111 | tty_wait_until_sent(tty, info->closing_wait); | |
1112 | /* | |
1113 | * At this point we stop accepting input. To do this, we | |
1114 | * disable the receive line status interrupts, and tell the | |
1115 | * interrupt driver to stop checking the data ready bit in the | |
1116 | * line status register. | |
1117 | */ | |
1118 | ||
1119 | uart->ustcnt &= ~USTCNT_RXEN; | |
1120 | uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK); | |
1121 | ||
1122 | shutdown(info); | |
978e595f | 1123 | rs_flush_buffer(tty); |
1da177e4 LT |
1124 | |
1125 | tty_ldisc_flush(tty); | |
1126 | tty->closing = 0; | |
1127 | info->event = 0; | |
a88487c7 | 1128 | info->port.tty = NULL; |
1da177e4 LT |
1129 | #warning "This is not and has never been valid so fix it" |
1130 | #if 0 | |
1131 | if (tty->ldisc.num != ldiscs[N_TTY].num) { | |
1132 | if (tty->ldisc.close) | |
1133 | (tty->ldisc.close)(tty); | |
1134 | tty->ldisc = ldiscs[N_TTY]; | |
1135 | tty->termios->c_line = N_TTY; | |
1136 | if (tty->ldisc.open) | |
1137 | (tty->ldisc.open)(tty); | |
1138 | } | |
1139 | #endif | |
1140 | if (info->blocked_open) { | |
1141 | if (info->close_delay) { | |
1142 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); | |
1143 | } | |
1144 | wake_up_interruptible(&info->open_wait); | |
1145 | } | |
1146 | info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING); | |
1147 | wake_up_interruptible(&info->close_wait); | |
727dda80 | 1148 | local_irq_restore(flags); |
1da177e4 LT |
1149 | } |
1150 | ||
1151 | /* | |
1152 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
1153 | */ | |
1154 | void rs_hangup(struct tty_struct *tty) | |
1155 | { | |
1156 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1157 | ||
1158 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) | |
1159 | return; | |
1160 | ||
1161 | rs_flush_buffer(tty); | |
1162 | shutdown(info); | |
1163 | info->event = 0; | |
1164 | info->count = 0; | |
1165 | info->flags &= ~S_NORMAL_ACTIVE; | |
a88487c7 | 1166 | info->port.tty = NULL; |
1da177e4 LT |
1167 | wake_up_interruptible(&info->open_wait); |
1168 | } | |
1169 | ||
1170 | /* | |
1171 | * ------------------------------------------------------------ | |
1172 | * rs_open() and friends | |
1173 | * ------------------------------------------------------------ | |
1174 | */ | |
1175 | static int block_til_ready(struct tty_struct *tty, struct file * filp, | |
1176 | struct m68k_serial *info) | |
1177 | { | |
1178 | DECLARE_WAITQUEUE(wait, current); | |
1179 | int retval; | |
1180 | int do_clocal = 0; | |
1181 | ||
1182 | /* | |
1183 | * If the device is in the middle of being closed, then block | |
1184 | * until it's done, and then try again. | |
1185 | */ | |
1186 | if (info->flags & S_CLOSING) { | |
1187 | interruptible_sleep_on(&info->close_wait); | |
1188 | #ifdef SERIAL_DO_RESTART | |
1189 | if (info->flags & S_HUP_NOTIFY) | |
1190 | return -EAGAIN; | |
1191 | else | |
1192 | return -ERESTARTSYS; | |
1193 | #else | |
1194 | return -EAGAIN; | |
1195 | #endif | |
1196 | } | |
1197 | ||
1198 | /* | |
1199 | * If non-blocking mode is set, or the port is not enabled, | |
1200 | * then make the check up front and then exit. | |
1201 | */ | |
1202 | if ((filp->f_flags & O_NONBLOCK) || | |
1203 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
1204 | info->flags |= S_NORMAL_ACTIVE; | |
1205 | return 0; | |
1206 | } | |
1207 | ||
1208 | if (tty->termios->c_cflag & CLOCAL) | |
1209 | do_clocal = 1; | |
1210 | ||
1211 | /* | |
1212 | * Block waiting for the carrier detect and the line to become | |
1213 | * free (i.e., not in use by the callout). While we are in | |
1214 | * this loop, info->count is dropped by one, so that | |
1215 | * rs_close() knows when to free things. We restore it upon | |
1216 | * exit, either normal or abnormal. | |
1217 | */ | |
1218 | retval = 0; | |
1219 | add_wait_queue(&info->open_wait, &wait); | |
1220 | ||
1221 | info->count--; | |
1222 | info->blocked_open++; | |
1223 | while (1) { | |
727dda80 | 1224 | local_irq_disable(); |
1da177e4 | 1225 | m68k_rtsdtr(info, 1); |
727dda80 | 1226 | local_irq_enable(); |
1da177e4 LT |
1227 | current->state = TASK_INTERRUPTIBLE; |
1228 | if (tty_hung_up_p(filp) || | |
1229 | !(info->flags & S_INITIALIZED)) { | |
1230 | #ifdef SERIAL_DO_RESTART | |
1231 | if (info->flags & S_HUP_NOTIFY) | |
1232 | retval = -EAGAIN; | |
1233 | else | |
1234 | retval = -ERESTARTSYS; | |
1235 | #else | |
1236 | retval = -EAGAIN; | |
1237 | #endif | |
1238 | break; | |
1239 | } | |
1240 | if (!(info->flags & S_CLOSING) && do_clocal) | |
1241 | break; | |
1242 | if (signal_pending(current)) { | |
1243 | retval = -ERESTARTSYS; | |
1244 | break; | |
1245 | } | |
1246 | schedule(); | |
1247 | } | |
1248 | current->state = TASK_RUNNING; | |
1249 | remove_wait_queue(&info->open_wait, &wait); | |
1250 | if (!tty_hung_up_p(filp)) | |
1251 | info->count++; | |
1252 | info->blocked_open--; | |
1253 | ||
1254 | if (retval) | |
1255 | return retval; | |
1256 | info->flags |= S_NORMAL_ACTIVE; | |
1257 | return 0; | |
1258 | } | |
1259 | ||
1260 | /* | |
1261 | * This routine is called whenever a serial port is opened. It | |
1262 | * enables interrupts for a serial port, linking in its S structure into | |
1263 | * the IRQ chain. It also performs the serial-specific | |
1264 | * initialization for the tty structure. | |
1265 | */ | |
1266 | int rs_open(struct tty_struct *tty, struct file * filp) | |
1267 | { | |
1268 | struct m68k_serial *info; | |
1269 | int retval, line; | |
1270 | ||
1271 | line = tty->index; | |
1272 | ||
1273 | if (line >= NR_PORTS || line < 0) /* we have exactly one */ | |
1274 | return -ENODEV; | |
1275 | ||
1276 | info = &m68k_soft[line]; | |
1277 | ||
1278 | if (serial_paranoia_check(info, tty->name, "rs_open")) | |
1279 | return -ENODEV; | |
1280 | ||
1281 | info->count++; | |
1282 | tty->driver_data = info; | |
a88487c7 | 1283 | info->port.tty = tty; |
1da177e4 LT |
1284 | |
1285 | /* | |
1286 | * Start up serial port | |
1287 | */ | |
1288 | retval = startup(info); | |
1289 | if (retval) | |
1290 | return retval; | |
1291 | ||
1292 | return block_til_ready(tty, filp, info); | |
1293 | } | |
1294 | ||
1295 | /* Finally, routines used to initialize the serial driver. */ | |
1296 | ||
1297 | static void show_serial_version(void) | |
1298 | { | |
1299 | printk("MC68328 serial driver version 1.00\n"); | |
1300 | } | |
1301 | ||
b68e31d0 | 1302 | static const struct tty_operations rs_ops = { |
1da177e4 LT |
1303 | .open = rs_open, |
1304 | .close = rs_close, | |
1305 | .write = rs_write, | |
1306 | .flush_chars = rs_flush_chars, | |
1307 | .write_room = rs_write_room, | |
1308 | .chars_in_buffer = rs_chars_in_buffer, | |
1309 | .flush_buffer = rs_flush_buffer, | |
1310 | .ioctl = rs_ioctl, | |
1311 | .throttle = rs_throttle, | |
1312 | .unthrottle = rs_unthrottle, | |
1313 | .set_termios = rs_set_termios, | |
1314 | .stop = rs_stop, | |
1315 | .start = rs_start, | |
1316 | .hangup = rs_hangup, | |
1317 | .set_ldisc = rs_set_ldisc, | |
1318 | }; | |
1319 | ||
1320 | /* rs_init inits the driver */ | |
1321 | static int __init | |
1322 | rs68328_init(void) | |
1323 | { | |
1324 | int flags, i; | |
1325 | struct m68k_serial *info; | |
1326 | ||
1327 | serial_driver = alloc_tty_driver(NR_PORTS); | |
1328 | if (!serial_driver) | |
1329 | return -ENOMEM; | |
1330 | ||
1331 | show_serial_version(); | |
1332 | ||
1333 | /* Initialize the tty_driver structure */ | |
1334 | /* SPARC: Not all of this is exactly right for us. */ | |
1335 | ||
1336 | serial_driver->name = "ttyS"; | |
1337 | serial_driver->major = TTY_MAJOR; | |
1338 | serial_driver->minor_start = 64; | |
1339 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
1340 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
1341 | serial_driver->init_termios = tty_std_termios; | |
1342 | serial_driver->init_termios.c_cflag = | |
1343 | m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL; | |
1344 | serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
1345 | tty_set_operations(serial_driver, &rs_ops); | |
1346 | ||
1347 | if (tty_register_driver(serial_driver)) { | |
1348 | put_tty_driver(serial_driver); | |
1349 | printk(KERN_ERR "Couldn't register serial driver\n"); | |
1350 | return -ENOMEM; | |
1351 | } | |
1352 | ||
727dda80 | 1353 | local_irq_save(flags); |
1da177e4 LT |
1354 | |
1355 | for(i=0;i<NR_PORTS;i++) { | |
1356 | ||
1357 | info = &m68k_soft[i]; | |
1358 | info->magic = SERIAL_MAGIC; | |
1359 | info->port = (int) &uart_addr[i]; | |
a88487c7 | 1360 | info->port.tty = NULL; |
1da177e4 LT |
1361 | info->irq = uart_irqs[i]; |
1362 | info->custom_divisor = 16; | |
1363 | info->close_delay = 50; | |
1364 | info->closing_wait = 3000; | |
1365 | info->x_char = 0; | |
1366 | info->event = 0; | |
1367 | info->count = 0; | |
1368 | info->blocked_open = 0; | |
931f9cde GU |
1369 | INIT_WORK(&info->tqueue, do_softint); |
1370 | INIT_WORK(&info->tqueue_hangup, do_serial_hangup); | |
1da177e4 LT |
1371 | init_waitqueue_head(&info->open_wait); |
1372 | init_waitqueue_head(&info->close_wait); | |
1373 | info->line = i; | |
1374 | info->is_cons = 1; /* Means shortcuts work */ | |
1375 | ||
1376 | printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line, | |
1377 | info->port, info->irq); | |
1378 | printk(" is a builtin MC68328 UART\n"); | |
1379 | ||
1da177e4 LT |
1380 | #ifdef CONFIG_M68VZ328 |
1381 | if (i > 0 ) | |
1382 | PJSEL &= 0xCF; /* PSW enable second port output */ | |
1383 | #endif | |
1384 | ||
1385 | if (request_irq(uart_irqs[i], | |
1386 | rs_interrupt, | |
7c74806b | 1387 | IRQF_DISABLED, |
25db8ad5 | 1388 | "M68328_UART", info)) |
1da177e4 | 1389 | panic("Unable to attach 68328 serial interrupt\n"); |
1da177e4 | 1390 | } |
727dda80 | 1391 | local_irq_restore(flags); |
1da177e4 LT |
1392 | return 0; |
1393 | } | |
1394 | ||
1da177e4 LT |
1395 | module_init(rs68328_init); |
1396 | ||
1397 | ||
1398 | ||
1399 | static void m68328_set_baud(void) | |
1400 | { | |
1401 | unsigned short ustcnt; | |
1402 | int i; | |
1403 | ||
1404 | ustcnt = USTCNT; | |
1405 | USTCNT = ustcnt & ~USTCNT_TXEN; | |
1406 | ||
1407 | again: | |
8b505ca8 | 1408 | for (i = 0; i < ARRAY_SIZE(baud_table); i++) |
1da177e4 LT |
1409 | if (baud_table[i] == m68328_console_baud) |
1410 | break; | |
8b505ca8 | 1411 | if (i >= ARRAY_SIZE(baud_table)) { |
1da177e4 LT |
1412 | m68328_console_baud = 9600; |
1413 | goto again; | |
1414 | } | |
1415 | ||
1416 | UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
1417 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
1418 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
1419 | ustcnt |= USTCNT_8_7; | |
1420 | ustcnt |= USTCNT_TXEN; | |
1421 | USTCNT = ustcnt; | |
1422 | m68328_console_initted = 1; | |
1423 | return; | |
1424 | } | |
1425 | ||
1426 | ||
1427 | int m68328_console_setup(struct console *cp, char *arg) | |
1428 | { | |
1429 | int i, n = CONSOLE_BAUD_RATE; | |
1430 | ||
1431 | if (!cp) | |
1432 | return(-1); | |
1433 | ||
1434 | if (arg) | |
1435 | n = simple_strtoul(arg,NULL,0); | |
1436 | ||
8b505ca8 | 1437 | for (i = 0; i < ARRAY_SIZE(baud_table); i++) |
1da177e4 LT |
1438 | if (baud_table[i] == n) |
1439 | break; | |
1440 | if (i < BAUD_TABLE_SIZE) { | |
1441 | m68328_console_baud = n; | |
1442 | m68328_console_cbaud = 0; | |
1443 | if (i > 15) { | |
1444 | m68328_console_cbaud |= CBAUDEX; | |
1445 | i -= 15; | |
1446 | } | |
1447 | m68328_console_cbaud |= i; | |
1448 | } | |
1449 | ||
1450 | m68328_set_baud(); /* make sure baud rate changes */ | |
1451 | return(0); | |
1452 | } | |
1453 | ||
1454 | ||
1455 | static struct tty_driver *m68328_console_device(struct console *c, int *index) | |
1456 | { | |
1457 | *index = c->index; | |
1458 | return serial_driver; | |
1459 | } | |
1460 | ||
1461 | ||
1462 | void m68328_console_write (struct console *co, const char *str, | |
1463 | unsigned int count) | |
1464 | { | |
1465 | if (!m68328_console_initted) | |
1466 | m68328_set_baud(); | |
1467 | while (count--) { | |
1468 | if (*str == '\n') | |
1469 | rs_put_char('\r'); | |
1470 | rs_put_char( *str++ ); | |
1471 | } | |
1472 | } | |
1473 | ||
1474 | ||
1475 | static struct console m68328_driver = { | |
1476 | .name = "ttyS", | |
1477 | .write = m68328_console_write, | |
1478 | .device = m68328_console_device, | |
1479 | .setup = m68328_console_setup, | |
1480 | .flags = CON_PRINTBUFFER, | |
1481 | .index = -1, | |
1482 | }; | |
1483 | ||
1484 | ||
1485 | static int __init m68328_console_init(void) | |
1486 | { | |
1487 | register_console(&m68328_driver); | |
1488 | return 0; | |
1489 | } | |
1490 | ||
1491 | console_initcall(m68328_console_init); |