Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* 68328serial.c: Serial port driver for 68328 microcontroller |
2 | * | |
3 | * Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu> | |
4 | * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> | |
5 | * Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org> | |
6 | * Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com> | |
7 | * Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com> | |
8 | * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com> | |
9 | * | |
10 | * VZ Support/Fixes Evan Stawnyczy <e@lineo.ca> | |
11 | * Multiple UART support Daniel Potts <danielp@cse.unsw.edu.au> | |
12 | * Power management support Daniel Potts <danielp@cse.unsw.edu.au> | |
13 | * VZ Second Serial Port enable Phil Wilshire | |
14 | * 2.4/2.5 port David McCullough | |
15 | */ | |
16 | ||
17 | #include <asm/dbg.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/signal.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/timer.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/tty.h> | |
25 | #include <linux/tty_flip.h> | |
1da177e4 LT |
26 | #include <linux/major.h> |
27 | #include <linux/string.h> | |
28 | #include <linux/fcntl.h> | |
29 | #include <linux/mm.h> | |
30 | #include <linux/kernel.h> | |
31 | #include <linux/console.h> | |
32 | #include <linux/reboot.h> | |
33 | #include <linux/keyboard.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/pm.h> | |
36 | #include <linux/bitops.h> | |
37 | #include <linux/delay.h> | |
38 | ||
39 | #include <asm/io.h> | |
40 | #include <asm/irq.h> | |
41 | #include <asm/system.h> | |
1da177e4 LT |
42 | #include <asm/delay.h> |
43 | #include <asm/uaccess.h> | |
44 | ||
45 | /* (es) */ | |
46 | /* note: perhaps we can murge these files, so that you can just | |
47 | * define 1 of them, and they can sort that out for themselves | |
48 | */ | |
49 | #if defined(CONFIG_M68EZ328) | |
50 | #include <asm/MC68EZ328.h> | |
51 | #else | |
52 | #if defined(CONFIG_M68VZ328) | |
53 | #include <asm/MC68VZ328.h> | |
54 | #else | |
55 | #include <asm/MC68328.h> | |
56 | #endif /* CONFIG_M68VZ328 */ | |
57 | #endif /* CONFIG_M68EZ328 */ | |
58 | ||
59 | #include "68328serial.h" | |
60 | ||
61 | /* Turn off usage of real serial interrupt code, to "support" Copilot */ | |
62 | #ifdef CONFIG_XCOPILOT_BUGS | |
63 | #undef USE_INTS | |
64 | #else | |
65 | #define USE_INTS | |
66 | #endif | |
67 | ||
68 | static struct m68k_serial m68k_soft[NR_PORTS]; | |
1da177e4 LT |
69 | |
70 | static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS; | |
71 | ||
72 | /* multiple ports are contiguous in memory */ | |
73 | m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR; | |
74 | ||
75 | struct tty_struct m68k_ttys; | |
76 | struct m68k_serial *m68k_consinfo = 0; | |
77 | ||
78 | #define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */ | |
79 | ||
80 | #ifdef CONFIG_CONSOLE | |
81 | extern wait_queue_head_t keypress_wait; | |
82 | #endif | |
83 | ||
84 | struct tty_driver *serial_driver; | |
85 | ||
1da177e4 LT |
86 | /* number of characters left in xmit buffer before we ask for more */ |
87 | #define WAKEUP_CHARS 256 | |
88 | ||
89 | /* Debugging... DEBUG_INTR is bad to use when one of the zs | |
90 | * lines is your console ;( | |
91 | */ | |
92 | #undef SERIAL_DEBUG_INTR | |
93 | #undef SERIAL_DEBUG_OPEN | |
94 | #undef SERIAL_DEBUG_FLOW | |
95 | ||
96 | #define RS_ISR_PASS_LIMIT 256 | |
97 | ||
1da177e4 LT |
98 | static void change_speed(struct m68k_serial *info); |
99 | ||
100 | /* | |
101 | * Setup for console. Argument comes from the boot command line. | |
102 | */ | |
103 | ||
104 | #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ) | |
105 | #define CONSOLE_BAUD_RATE 115200 | |
106 | #define DEFAULT_CBAUD B115200 | |
107 | #else | |
108 | /* (es) */ | |
109 | /* note: this is messy, but it works, again, perhaps defined somewhere else?*/ | |
110 | #ifdef CONFIG_M68VZ328 | |
111 | #define CONSOLE_BAUD_RATE 19200 | |
112 | #define DEFAULT_CBAUD B19200 | |
113 | #endif | |
114 | /* (/es) */ | |
115 | #endif | |
116 | ||
117 | #ifndef CONSOLE_BAUD_RATE | |
118 | #define CONSOLE_BAUD_RATE 9600 | |
119 | #define DEFAULT_CBAUD B9600 | |
120 | #endif | |
121 | ||
122 | ||
123 | static int m68328_console_initted = 0; | |
124 | static int m68328_console_baud = CONSOLE_BAUD_RATE; | |
125 | static int m68328_console_cbaud = DEFAULT_CBAUD; | |
126 | ||
127 | ||
1da177e4 LT |
128 | static inline int serial_paranoia_check(struct m68k_serial *info, |
129 | char *name, const char *routine) | |
130 | { | |
131 | #ifdef SERIAL_PARANOIA_CHECK | |
132 | static const char *badmagic = | |
133 | "Warning: bad magic number for serial struct %s in %s\n"; | |
134 | static const char *badinfo = | |
135 | "Warning: null m68k_serial for %s in %s\n"; | |
136 | ||
137 | if (!info) { | |
138 | printk(badinfo, name, routine); | |
139 | return 1; | |
140 | } | |
141 | if (info->magic != SERIAL_MAGIC) { | |
142 | printk(badmagic, name, routine); | |
143 | return 1; | |
144 | } | |
145 | #endif | |
146 | return 0; | |
147 | } | |
148 | ||
149 | /* | |
150 | * This is used to figure out the divisor speeds and the timeouts | |
151 | */ | |
152 | static int baud_table[] = { | |
153 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, | |
154 | 9600, 19200, 38400, 57600, 115200, 0 }; | |
155 | ||
1da177e4 LT |
156 | /* Sets or clears DTR/RTS on the requested line */ |
157 | static inline void m68k_rtsdtr(struct m68k_serial *ss, int set) | |
158 | { | |
159 | if (set) { | |
160 | /* set the RTS/CTS line */ | |
161 | } else { | |
162 | /* clear it */ | |
163 | } | |
164 | return; | |
165 | } | |
166 | ||
167 | /* Utility routines */ | |
168 | static inline int get_baud(struct m68k_serial *ss) | |
169 | { | |
170 | unsigned long result = 115200; | |
171 | unsigned short int baud = uart_addr[ss->line].ubaud; | |
172 | if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400; | |
173 | result >>= GET_FIELD(baud, UBAUD_DIVIDE); | |
174 | ||
175 | return result; | |
176 | } | |
177 | ||
178 | /* | |
179 | * ------------------------------------------------------------ | |
180 | * rs_stop() and rs_start() | |
181 | * | |
182 | * This routines are called before setting or resetting tty->stopped. | |
183 | * They enable or disable transmitter interrupts, as necessary. | |
184 | * ------------------------------------------------------------ | |
185 | */ | |
186 | static void rs_stop(struct tty_struct *tty) | |
187 | { | |
188 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
189 | m68328_uart *uart = &uart_addr[info->line]; | |
190 | unsigned long flags; | |
191 | ||
192 | if (serial_paranoia_check(info, tty->name, "rs_stop")) | |
193 | return; | |
194 | ||
727dda80 | 195 | local_irq_save(flags); |
1da177e4 | 196 | uart->ustcnt &= ~USTCNT_TXEN; |
727dda80 | 197 | local_irq_restore(flags); |
1da177e4 LT |
198 | } |
199 | ||
09a6ffa8 | 200 | static int rs_put_char(char ch) |
1da177e4 LT |
201 | { |
202 | int flags, loops = 0; | |
203 | ||
727dda80 | 204 | local_irq_save(flags); |
1da177e4 LT |
205 | |
206 | while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) { | |
207 | loops++; | |
208 | udelay(5); | |
209 | } | |
210 | ||
211 | UTX_TXDATA = ch; | |
212 | udelay(5); | |
727dda80 | 213 | local_irq_restore(flags); |
09a6ffa8 | 214 | return 1; |
1da177e4 LT |
215 | } |
216 | ||
217 | static void rs_start(struct tty_struct *tty) | |
218 | { | |
219 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
220 | m68328_uart *uart = &uart_addr[info->line]; | |
221 | unsigned long flags; | |
222 | ||
223 | if (serial_paranoia_check(info, tty->name, "rs_start")) | |
224 | return; | |
225 | ||
727dda80 | 226 | local_irq_save(flags); |
1da177e4 LT |
227 | if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) { |
228 | #ifdef USE_INTS | |
229 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
230 | #else | |
231 | uart->ustcnt |= USTCNT_TXEN; | |
232 | #endif | |
233 | } | |
727dda80 | 234 | local_irq_restore(flags); |
1da177e4 LT |
235 | } |
236 | ||
237 | /* Drop into either the boot monitor or kadb upon receiving a break | |
238 | * from keyboard/console input. | |
239 | */ | |
240 | static void batten_down_hatches(void) | |
241 | { | |
242 | /* Drop into the debugger */ | |
243 | } | |
244 | ||
41c28ff1 | 245 | static void status_handle(struct m68k_serial *info, unsigned short status) |
1da177e4 LT |
246 | { |
247 | #if 0 | |
248 | if(status & DCD) { | |
a88487c7 | 249 | if((info->port.tty->termios->c_cflag & CRTSCTS) && |
1da177e4 LT |
250 | ((info->curregs[3] & AUTO_ENAB)==0)) { |
251 | info->curregs[3] |= AUTO_ENAB; | |
252 | info->pendregs[3] |= AUTO_ENAB; | |
253 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
254 | } | |
255 | } else { | |
256 | if((info->curregs[3] & AUTO_ENAB)) { | |
257 | info->curregs[3] &= ~AUTO_ENAB; | |
258 | info->pendregs[3] &= ~AUTO_ENAB; | |
259 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
260 | } | |
261 | } | |
262 | #endif | |
263 | /* If this is console input and this is a | |
264 | * 'break asserted' status change interrupt | |
265 | * see if we can drop into the debugger | |
266 | */ | |
267 | if((status & URX_BREAK) && info->break_abort) | |
268 | batten_down_hatches(); | |
269 | return; | |
270 | } | |
271 | ||
7d12e780 | 272 | static void receive_chars(struct m68k_serial *info, unsigned short rx) |
1da177e4 | 273 | { |
a88487c7 | 274 | struct tty_struct *tty = info->port.tty; |
1da177e4 | 275 | m68328_uart *uart = &uart_addr[info->line]; |
33f0f88f | 276 | unsigned char ch, flag; |
1da177e4 LT |
277 | |
278 | /* | |
279 | * This do { } while() loop will get ALL chars out of Rx FIFO | |
280 | */ | |
281 | #ifndef CONFIG_XCOPILOT_BUGS | |
282 | do { | |
283 | #endif | |
284 | ch = GET_FIELD(rx, URX_RXDATA); | |
285 | ||
286 | if(info->is_cons) { | |
287 | if(URX_BREAK & rx) { /* whee, break received */ | |
288 | status_handle(info, rx); | |
289 | return; | |
290 | #ifdef CONFIG_MAGIC_SYSRQ | |
291 | } else if (ch == 0x10) { /* ^P */ | |
292 | show_state(); | |
293 | show_free_areas(); | |
294 | show_buffers(); | |
295 | /* show_net_buffers(); */ | |
296 | return; | |
297 | } else if (ch == 0x12) { /* ^R */ | |
804ebf46 | 298 | emergency_restart(); |
1da177e4 LT |
299 | return; |
300 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
301 | } | |
302 | /* It is a 'keyboard interrupt' ;-) */ | |
303 | #ifdef CONFIG_CONSOLE | |
304 | wake_up(&keypress_wait); | |
305 | #endif | |
306 | } | |
307 | ||
308 | if(!tty) | |
309 | goto clear_and_exit; | |
310 | ||
33f0f88f AC |
311 | flag = TTY_NORMAL; |
312 | ||
1da177e4 | 313 | if(rx & URX_PARITY_ERROR) { |
33f0f88f | 314 | flag = TTY_PARITY; |
1da177e4 LT |
315 | status_handle(info, rx); |
316 | } else if(rx & URX_OVRUN) { | |
33f0f88f | 317 | flag = TTY_OVERRUN; |
1da177e4 LT |
318 | status_handle(info, rx); |
319 | } else if(rx & URX_FRAME_ERROR) { | |
33f0f88f | 320 | flag = TTY_FRAME; |
1da177e4 | 321 | status_handle(info, rx); |
1da177e4 | 322 | } |
33f0f88f | 323 | tty_insert_flip_char(tty, ch, flag); |
1da177e4 LT |
324 | #ifndef CONFIG_XCOPILOT_BUGS |
325 | } while((rx = uart->urx.w) & URX_DATA_READY); | |
326 | #endif | |
327 | ||
8e63e66b | 328 | tty_schedule_flip(tty); |
1da177e4 LT |
329 | |
330 | clear_and_exit: | |
331 | return; | |
332 | } | |
333 | ||
41c28ff1 | 334 | static void transmit_chars(struct m68k_serial *info) |
1da177e4 LT |
335 | { |
336 | m68328_uart *uart = &uart_addr[info->line]; | |
337 | ||
338 | if (info->x_char) { | |
339 | /* Send next char */ | |
340 | uart->utx.b.txdata = info->x_char; | |
341 | info->x_char = 0; | |
342 | goto clear_and_return; | |
343 | } | |
344 | ||
a88487c7 | 345 | if((info->xmit_cnt <= 0) || info->port.tty->stopped) { |
1da177e4 LT |
346 | /* That's peculiar... TX ints off */ |
347 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
348 | goto clear_and_return; | |
349 | } | |
350 | ||
351 | /* Send char */ | |
352 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
353 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
354 | info->xmit_cnt--; | |
355 | ||
356 | if (info->xmit_cnt < WAKEUP_CHARS) | |
357 | schedule_work(&info->tqueue); | |
358 | ||
359 | if(info->xmit_cnt <= 0) { | |
360 | /* All done for now... TX ints off */ | |
361 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
362 | goto clear_and_return; | |
363 | } | |
364 | ||
365 | clear_and_return: | |
366 | /* Clear interrupt (should be auto)*/ | |
367 | return; | |
368 | } | |
369 | ||
370 | /* | |
371 | * This is the serial driver's generic interrupt routine | |
372 | */ | |
7d12e780 | 373 | irqreturn_t rs_interrupt(int irq, void *dev_id) |
1da177e4 | 374 | { |
25db8ad5 | 375 | struct m68k_serial *info = dev_id; |
1da177e4 LT |
376 | m68328_uart *uart; |
377 | unsigned short rx; | |
378 | unsigned short tx; | |
379 | ||
1da177e4 LT |
380 | uart = &uart_addr[info->line]; |
381 | rx = uart->urx.w; | |
382 | ||
383 | #ifdef USE_INTS | |
384 | tx = uart->utx.w; | |
385 | ||
7d12e780 | 386 | if (rx & URX_DATA_READY) receive_chars(info, rx); |
1da177e4 LT |
387 | if (tx & UTX_TX_AVAIL) transmit_chars(info); |
388 | #else | |
7d12e780 | 389 | receive_chars(info, rx); |
1da177e4 LT |
390 | #endif |
391 | return IRQ_HANDLED; | |
392 | } | |
393 | ||
931f9cde | 394 | static void do_softint(struct work_struct *work) |
1da177e4 | 395 | { |
931f9cde | 396 | struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue); |
1da177e4 LT |
397 | struct tty_struct *tty; |
398 | ||
a88487c7 | 399 | tty = info->port.tty; |
1da177e4 LT |
400 | if (!tty) |
401 | return; | |
402 | #if 0 | |
403 | if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { | |
404 | tty_wakeup(tty); | |
405 | } | |
406 | #endif | |
407 | } | |
408 | ||
409 | /* | |
410 | * This routine is called from the scheduler tqueue when the interrupt | |
411 | * routine has signalled that a hangup has occurred. The path of | |
412 | * hangup processing is: | |
413 | * | |
414 | * serial interrupt routine -> (scheduler tqueue) -> | |
415 | * do_serial_hangup() -> tty->hangup() -> rs_hangup() | |
416 | * | |
417 | */ | |
931f9cde | 418 | static void do_serial_hangup(struct work_struct *work) |
1da177e4 | 419 | { |
931f9cde | 420 | struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue_hangup); |
1da177e4 LT |
421 | struct tty_struct *tty; |
422 | ||
a88487c7 | 423 | tty = info->port.tty; |
1da177e4 LT |
424 | if (!tty) |
425 | return; | |
426 | ||
427 | tty_hangup(tty); | |
428 | } | |
429 | ||
430 | ||
431 | static int startup(struct m68k_serial * info) | |
432 | { | |
433 | m68328_uart *uart = &uart_addr[info->line]; | |
434 | unsigned long flags; | |
435 | ||
436 | if (info->flags & S_INITIALIZED) | |
437 | return 0; | |
438 | ||
439 | if (!info->xmit_buf) { | |
440 | info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL); | |
441 | if (!info->xmit_buf) | |
442 | return -ENOMEM; | |
443 | } | |
444 | ||
727dda80 | 445 | local_irq_save(flags); |
1da177e4 LT |
446 | |
447 | /* | |
448 | * Clear the FIFO buffers and disable them | |
449 | * (they will be reenabled in change_speed()) | |
450 | */ | |
451 | ||
452 | uart->ustcnt = USTCNT_UEN; | |
453 | info->xmit_fifo_size = 1; | |
454 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN; | |
455 | (void)uart->urx.w; | |
456 | ||
457 | /* | |
458 | * Finally, enable sequencing and interrupts | |
459 | */ | |
460 | #ifdef USE_INTS | |
461 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | | |
462 | USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK; | |
463 | #else | |
464 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK; | |
465 | #endif | |
466 | ||
a88487c7 TI |
467 | if (info->port.tty) |
468 | clear_bit(TTY_IO_ERROR, &info->port.tty->flags); | |
1da177e4 LT |
469 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
470 | ||
471 | /* | |
472 | * and set the speed of the serial port | |
473 | */ | |
474 | ||
475 | change_speed(info); | |
476 | ||
477 | info->flags |= S_INITIALIZED; | |
727dda80 | 478 | local_irq_restore(flags); |
1da177e4 LT |
479 | return 0; |
480 | } | |
481 | ||
482 | /* | |
483 | * This routine will shutdown a serial port; interrupts are disabled, and | |
484 | * DTR is dropped if the hangup on close termio flag is on. | |
485 | */ | |
486 | static void shutdown(struct m68k_serial * info) | |
487 | { | |
488 | m68328_uart *uart = &uart_addr[info->line]; | |
489 | unsigned long flags; | |
490 | ||
491 | uart->ustcnt = 0; /* All off! */ | |
492 | if (!(info->flags & S_INITIALIZED)) | |
493 | return; | |
494 | ||
727dda80 | 495 | local_irq_save(flags); |
1da177e4 LT |
496 | |
497 | if (info->xmit_buf) { | |
498 | free_page((unsigned long) info->xmit_buf); | |
499 | info->xmit_buf = 0; | |
500 | } | |
501 | ||
a88487c7 TI |
502 | if (info->port.tty) |
503 | set_bit(TTY_IO_ERROR, &info->port.tty->flags); | |
1da177e4 LT |
504 | |
505 | info->flags &= ~S_INITIALIZED; | |
727dda80 | 506 | local_irq_restore(flags); |
1da177e4 LT |
507 | } |
508 | ||
509 | struct { | |
510 | int divisor, prescale; | |
511 | } | |
512 | #ifndef CONFIG_M68VZ328 | |
513 | hw_baud_table[18] = { | |
514 | {0,0}, /* 0 */ | |
515 | {0,0}, /* 50 */ | |
516 | {0,0}, /* 75 */ | |
517 | {0,0}, /* 110 */ | |
518 | {0,0}, /* 134 */ | |
519 | {0,0}, /* 150 */ | |
520 | {0,0}, /* 200 */ | |
521 | {7,0x26}, /* 300 */ | |
522 | {6,0x26}, /* 600 */ | |
523 | {5,0x26}, /* 1200 */ | |
524 | {0,0}, /* 1800 */ | |
525 | {4,0x26}, /* 2400 */ | |
526 | {3,0x26}, /* 4800 */ | |
527 | {2,0x26}, /* 9600 */ | |
528 | {1,0x26}, /* 19200 */ | |
529 | {0,0x26}, /* 38400 */ | |
530 | {1,0x38}, /* 57600 */ | |
531 | {0,0x38}, /* 115200 */ | |
532 | }; | |
533 | #else | |
534 | hw_baud_table[18] = { | |
535 | {0,0}, /* 0 */ | |
536 | {0,0}, /* 50 */ | |
537 | {0,0}, /* 75 */ | |
538 | {0,0}, /* 110 */ | |
539 | {0,0}, /* 134 */ | |
540 | {0,0}, /* 150 */ | |
541 | {0,0}, /* 200 */ | |
542 | {0,0}, /* 300 */ | |
543 | {7,0x26}, /* 600 */ | |
544 | {6,0x26}, /* 1200 */ | |
545 | {0,0}, /* 1800 */ | |
546 | {5,0x26}, /* 2400 */ | |
547 | {4,0x26}, /* 4800 */ | |
548 | {3,0x26}, /* 9600 */ | |
549 | {2,0x26}, /* 19200 */ | |
550 | {1,0x26}, /* 38400 */ | |
551 | {0,0x26}, /* 57600 */ | |
552 | {1,0x38}, /* 115200 */ | |
553 | }; | |
554 | #endif | |
555 | /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */ | |
556 | ||
557 | /* | |
558 | * This routine is called to set the UART divisor registers to match | |
559 | * the specified baud rate for a serial port. | |
560 | */ | |
561 | static void change_speed(struct m68k_serial *info) | |
562 | { | |
563 | m68328_uart *uart = &uart_addr[info->line]; | |
564 | unsigned short port; | |
565 | unsigned short ustcnt; | |
566 | unsigned cflag; | |
567 | int i; | |
568 | ||
a88487c7 | 569 | if (!info->port.tty || !info->port.tty->termios) |
1da177e4 | 570 | return; |
a88487c7 | 571 | cflag = info->port.tty->termios->c_cflag; |
1da177e4 LT |
572 | if (!(port = info->port)) |
573 | return; | |
574 | ||
575 | ustcnt = uart->ustcnt; | |
576 | uart->ustcnt = ustcnt & ~USTCNT_TXEN; | |
577 | ||
578 | i = cflag & CBAUD; | |
579 | if (i & CBAUDEX) { | |
580 | i = (i & ~CBAUDEX) + B38400; | |
581 | } | |
582 | ||
583 | info->baud = baud_table[i]; | |
584 | uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
585 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
586 | ||
587 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
588 | ||
589 | if ((cflag & CSIZE) == CS8) | |
590 | ustcnt |= USTCNT_8_7; | |
591 | ||
592 | if (cflag & CSTOPB) | |
593 | ustcnt |= USTCNT_STOP; | |
594 | ||
595 | if (cflag & PARENB) | |
596 | ustcnt |= USTCNT_PARITYEN; | |
597 | if (cflag & PARODD) | |
598 | ustcnt |= USTCNT_ODD_EVEN; | |
599 | ||
600 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
601 | if (cflag & CRTSCTS) { | |
602 | uart->utx.w &= ~ UTX_NOCTS; | |
603 | } else { | |
604 | uart->utx.w |= UTX_NOCTS; | |
605 | } | |
606 | #endif | |
607 | ||
608 | ustcnt |= USTCNT_TXEN; | |
609 | ||
610 | uart->ustcnt = ustcnt; | |
611 | return; | |
612 | } | |
613 | ||
614 | /* | |
615 | * Fair output driver allows a process to speak. | |
616 | */ | |
617 | static void rs_fair_output(void) | |
618 | { | |
619 | int left; /* Output no more than that */ | |
620 | unsigned long flags; | |
621 | struct m68k_serial *info = &m68k_soft[0]; | |
622 | char c; | |
623 | ||
624 | if (info == 0) return; | |
625 | if (info->xmit_buf == 0) return; | |
626 | ||
727dda80 | 627 | local_irq_save(flags); |
1da177e4 LT |
628 | left = info->xmit_cnt; |
629 | while (left != 0) { | |
630 | c = info->xmit_buf[info->xmit_tail]; | |
631 | info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1); | |
632 | info->xmit_cnt--; | |
727dda80 | 633 | local_irq_restore(flags); |
1da177e4 LT |
634 | |
635 | rs_put_char(c); | |
636 | ||
727dda80 | 637 | local_irq_save(flags); |
1da177e4 LT |
638 | left = min(info->xmit_cnt, left-1); |
639 | } | |
640 | ||
641 | /* Last character is being transmitted now (hopefully). */ | |
642 | udelay(5); | |
643 | ||
727dda80 | 644 | local_irq_restore(flags); |
1da177e4 LT |
645 | return; |
646 | } | |
647 | ||
648 | /* | |
649 | * m68k_console_print is registered for printk. | |
650 | */ | |
651 | void console_print_68328(const char *p) | |
652 | { | |
653 | char c; | |
654 | ||
655 | while((c=*(p++)) != 0) { | |
656 | if(c == '\n') | |
657 | rs_put_char('\r'); | |
658 | rs_put_char(c); | |
659 | } | |
660 | ||
661 | /* Comment this if you want to have a strict interrupt-driven output */ | |
662 | rs_fair_output(); | |
663 | ||
664 | return; | |
665 | } | |
666 | ||
667 | static void rs_set_ldisc(struct tty_struct *tty) | |
668 | { | |
669 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
670 | ||
671 | if (serial_paranoia_check(info, tty->name, "rs_set_ldisc")) | |
672 | return; | |
673 | ||
674 | info->is_cons = (tty->termios->c_line == N_TTY); | |
675 | ||
676 | printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off"); | |
677 | } | |
678 | ||
679 | static void rs_flush_chars(struct tty_struct *tty) | |
680 | { | |
681 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
682 | m68328_uart *uart = &uart_addr[info->line]; | |
683 | unsigned long flags; | |
684 | ||
685 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) | |
686 | return; | |
687 | #ifndef USE_INTS | |
688 | for(;;) { | |
689 | #endif | |
690 | ||
691 | /* Enable transmitter */ | |
727dda80 | 692 | local_irq_save(flags); |
1da177e4 LT |
693 | |
694 | if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || | |
695 | !info->xmit_buf) { | |
727dda80 | 696 | local_irq_restore(flags); |
1da177e4 LT |
697 | return; |
698 | } | |
699 | ||
700 | #ifdef USE_INTS | |
701 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
702 | #else | |
703 | uart->ustcnt |= USTCNT_TXEN; | |
704 | #endif | |
705 | ||
706 | #ifdef USE_INTS | |
707 | if (uart->utx.w & UTX_TX_AVAIL) { | |
708 | #else | |
709 | if (1) { | |
710 | #endif | |
711 | /* Send char */ | |
712 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
713 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
714 | info->xmit_cnt--; | |
715 | } | |
716 | ||
717 | #ifndef USE_INTS | |
718 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
719 | } | |
720 | #endif | |
727dda80 | 721 | local_irq_restore(flags); |
1da177e4 LT |
722 | } |
723 | ||
724 | extern void console_printn(const char * b, int count); | |
725 | ||
726 | static int rs_write(struct tty_struct * tty, | |
727 | const unsigned char *buf, int count) | |
728 | { | |
729 | int c, total = 0; | |
730 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
731 | m68328_uart *uart = &uart_addr[info->line]; | |
732 | unsigned long flags; | |
733 | ||
734 | if (serial_paranoia_check(info, tty->name, "rs_write")) | |
735 | return 0; | |
736 | ||
737 | if (!tty || !info->xmit_buf) | |
738 | return 0; | |
739 | ||
727dda80 | 740 | local_save_flags(flags); |
1da177e4 | 741 | while (1) { |
727dda80 | 742 | local_irq_disable(); |
1da177e4 LT |
743 | c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, |
744 | SERIAL_XMIT_SIZE - info->xmit_head)); | |
727dda80 GU |
745 | local_irq_restore(flags); |
746 | ||
1da177e4 LT |
747 | if (c <= 0) |
748 | break; | |
749 | ||
750 | memcpy(info->xmit_buf + info->xmit_head, buf, c); | |
727dda80 GU |
751 | |
752 | local_irq_disable(); | |
1da177e4 LT |
753 | info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); |
754 | info->xmit_cnt += c; | |
727dda80 | 755 | local_irq_restore(flags); |
1da177e4 LT |
756 | buf += c; |
757 | count -= c; | |
758 | total += c; | |
759 | } | |
760 | ||
761 | if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) { | |
762 | /* Enable transmitter */ | |
727dda80 | 763 | local_irq_disable(); |
1da177e4 LT |
764 | #ifndef USE_INTS |
765 | while(info->xmit_cnt) { | |
766 | #endif | |
767 | ||
768 | uart->ustcnt |= USTCNT_TXEN; | |
769 | #ifdef USE_INTS | |
770 | uart->ustcnt |= USTCNT_TX_INTR_MASK; | |
771 | #else | |
772 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
773 | #endif | |
774 | if (uart->utx.w & UTX_TX_AVAIL) { | |
775 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
776 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
777 | info->xmit_cnt--; | |
778 | } | |
779 | ||
780 | #ifndef USE_INTS | |
781 | } | |
782 | #endif | |
727dda80 | 783 | local_irq_restore(flags); |
1da177e4 | 784 | } |
727dda80 | 785 | |
1da177e4 LT |
786 | return total; |
787 | } | |
788 | ||
789 | static int rs_write_room(struct tty_struct *tty) | |
790 | { | |
791 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
792 | int ret; | |
793 | ||
794 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) | |
795 | return 0; | |
796 | ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; | |
797 | if (ret < 0) | |
798 | ret = 0; | |
799 | return ret; | |
800 | } | |
801 | ||
802 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
803 | { | |
804 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
805 | ||
806 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) | |
807 | return 0; | |
808 | return info->xmit_cnt; | |
809 | } | |
810 | ||
811 | static void rs_flush_buffer(struct tty_struct *tty) | |
812 | { | |
813 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
727dda80 | 814 | unsigned long flags; |
1da177e4 LT |
815 | |
816 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) | |
817 | return; | |
727dda80 | 818 | local_irq_save(flags); |
1da177e4 | 819 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
727dda80 | 820 | local_irq_restore(flags); |
1da177e4 LT |
821 | tty_wakeup(tty); |
822 | } | |
823 | ||
824 | /* | |
825 | * ------------------------------------------------------------ | |
826 | * rs_throttle() | |
827 | * | |
828 | * This routine is called by the upper-layer tty layer to signal that | |
829 | * incoming characters should be throttled. | |
830 | * ------------------------------------------------------------ | |
831 | */ | |
832 | static void rs_throttle(struct tty_struct * tty) | |
833 | { | |
834 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
835 | ||
836 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) | |
837 | return; | |
838 | ||
839 | if (I_IXOFF(tty)) | |
840 | info->x_char = STOP_CHAR(tty); | |
841 | ||
842 | /* Turn off RTS line (do this atomic) */ | |
843 | } | |
844 | ||
845 | static void rs_unthrottle(struct tty_struct * tty) | |
846 | { | |
847 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
848 | ||
849 | if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) | |
850 | return; | |
851 | ||
852 | if (I_IXOFF(tty)) { | |
853 | if (info->x_char) | |
854 | info->x_char = 0; | |
855 | else | |
856 | info->x_char = START_CHAR(tty); | |
857 | } | |
858 | ||
859 | /* Assert RTS line (do this atomic) */ | |
860 | } | |
861 | ||
862 | /* | |
863 | * ------------------------------------------------------------ | |
864 | * rs_ioctl() and friends | |
865 | * ------------------------------------------------------------ | |
866 | */ | |
867 | ||
868 | static int get_serial_info(struct m68k_serial * info, | |
869 | struct serial_struct * retinfo) | |
870 | { | |
871 | struct serial_struct tmp; | |
872 | ||
873 | if (!retinfo) | |
874 | return -EFAULT; | |
875 | memset(&tmp, 0, sizeof(tmp)); | |
876 | tmp.type = info->type; | |
877 | tmp.line = info->line; | |
878 | tmp.port = info->port; | |
879 | tmp.irq = info->irq; | |
880 | tmp.flags = info->flags; | |
881 | tmp.baud_base = info->baud_base; | |
882 | tmp.close_delay = info->close_delay; | |
883 | tmp.closing_wait = info->closing_wait; | |
884 | tmp.custom_divisor = info->custom_divisor; | |
885 | copy_to_user(retinfo,&tmp,sizeof(*retinfo)); | |
886 | return 0; | |
887 | } | |
888 | ||
889 | static int set_serial_info(struct m68k_serial * info, | |
890 | struct serial_struct * new_info) | |
891 | { | |
892 | struct serial_struct new_serial; | |
893 | struct m68k_serial old_info; | |
894 | int retval = 0; | |
895 | ||
896 | if (!new_info) | |
897 | return -EFAULT; | |
898 | copy_from_user(&new_serial,new_info,sizeof(new_serial)); | |
899 | old_info = *info; | |
900 | ||
901 | if (!capable(CAP_SYS_ADMIN)) { | |
902 | if ((new_serial.baud_base != info->baud_base) || | |
903 | (new_serial.type != info->type) || | |
904 | (new_serial.close_delay != info->close_delay) || | |
905 | ((new_serial.flags & ~S_USR_MASK) != | |
906 | (info->flags & ~S_USR_MASK))) | |
907 | return -EPERM; | |
908 | info->flags = ((info->flags & ~S_USR_MASK) | | |
909 | (new_serial.flags & S_USR_MASK)); | |
910 | info->custom_divisor = new_serial.custom_divisor; | |
911 | goto check_and_exit; | |
912 | } | |
913 | ||
914 | if (info->count > 1) | |
915 | return -EBUSY; | |
916 | ||
917 | /* | |
918 | * OK, past this point, all the error checking has been done. | |
919 | * At this point, we start making changes..... | |
920 | */ | |
921 | ||
922 | info->baud_base = new_serial.baud_base; | |
923 | info->flags = ((info->flags & ~S_FLAGS) | | |
924 | (new_serial.flags & S_FLAGS)); | |
925 | info->type = new_serial.type; | |
926 | info->close_delay = new_serial.close_delay; | |
927 | info->closing_wait = new_serial.closing_wait; | |
928 | ||
929 | check_and_exit: | |
930 | retval = startup(info); | |
931 | return retval; | |
932 | } | |
933 | ||
934 | /* | |
935 | * get_lsr_info - get line status register info | |
936 | * | |
937 | * Purpose: Let user call ioctl() to get info when the UART physically | |
938 | * is emptied. On bus types like RS485, the transmitter must | |
939 | * release the bus after transmitting. This must be done when | |
940 | * the transmit shift register is empty, not be done when the | |
941 | * transmit holding register is empty. This functionality | |
942 | * allows an RS485 driver to be written in user space. | |
943 | */ | |
944 | static int get_lsr_info(struct m68k_serial * info, unsigned int *value) | |
945 | { | |
946 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
947 | m68328_uart *uart = &uart_addr[info->line]; | |
948 | #endif | |
949 | unsigned char status; | |
727dda80 | 950 | unsigned long flags; |
1da177e4 | 951 | |
727dda80 | 952 | local_irq_save(flags); |
1da177e4 LT |
953 | #ifdef CONFIG_SERIAL_68328_RTS_CTS |
954 | status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0; | |
955 | #else | |
956 | status = 0; | |
957 | #endif | |
727dda80 | 958 | local_irq_restore(flags); |
1da177e4 LT |
959 | put_user(status,value); |
960 | return 0; | |
961 | } | |
962 | ||
963 | /* | |
964 | * This routine sends a break character out the serial port. | |
965 | */ | |
6a72c7ba | 966 | static void send_break(struct m68k_serial * info, unsigned int duration) |
1da177e4 LT |
967 | { |
968 | m68328_uart *uart = &uart_addr[info->line]; | |
969 | unsigned long flags; | |
970 | if (!info->port) | |
971 | return; | |
727dda80 | 972 | local_irq_save(flags); |
1da177e4 LT |
973 | #ifdef USE_INTS |
974 | uart->utx.w |= UTX_SEND_BREAK; | |
6a72c7ba | 975 | msleep_interruptible(duration); |
1da177e4 LT |
976 | uart->utx.w &= ~UTX_SEND_BREAK; |
977 | #endif | |
727dda80 | 978 | local_irq_restore(flags); |
1da177e4 LT |
979 | } |
980 | ||
981 | static int rs_ioctl(struct tty_struct *tty, struct file * file, | |
982 | unsigned int cmd, unsigned long arg) | |
983 | { | |
984 | int error; | |
985 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
986 | int retval; | |
987 | ||
988 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
989 | return -ENODEV; | |
990 | ||
991 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
992 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && | |
993 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { | |
994 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
995 | return -EIO; | |
996 | } | |
997 | ||
998 | switch (cmd) { | |
999 | case TCSBRK: /* SVID version: non-zero arg --> no break */ | |
1000 | retval = tty_check_change(tty); | |
1001 | if (retval) | |
1002 | return retval; | |
1003 | tty_wait_until_sent(tty, 0); | |
1004 | if (!arg) | |
6a72c7ba | 1005 | send_break(info, 250); /* 1/4 second */ |
1da177e4 LT |
1006 | return 0; |
1007 | case TCSBRKP: /* support for POSIX tcsendbreak() */ | |
1008 | retval = tty_check_change(tty); | |
1009 | if (retval) | |
1010 | return retval; | |
1011 | tty_wait_until_sent(tty, 0); | |
6a72c7ba | 1012 | send_break(info, arg ? arg*(100) : 250); |
1da177e4 | 1013 | return 0; |
1da177e4 LT |
1014 | case TIOCGSERIAL: |
1015 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
1016 | sizeof(struct serial_struct))) | |
1017 | return get_serial_info(info, | |
1018 | (struct serial_struct *) arg); | |
1019 | return -EFAULT; | |
1020 | case TIOCSSERIAL: | |
1021 | return set_serial_info(info, | |
1022 | (struct serial_struct *) arg); | |
1023 | case TIOCSERGETLSR: /* Get line status register */ | |
1024 | if (access_ok(VERIFY_WRITE, (void *) arg, | |
727dda80 | 1025 | sizeof(unsigned int))) |
1da177e4 LT |
1026 | return get_lsr_info(info, (unsigned int *) arg); |
1027 | return -EFAULT; | |
1028 | case TIOCSERGSTRUCT: | |
1029 | if (!access_ok(VERIFY_WRITE, (void *) arg, | |
1030 | sizeof(struct m68k_serial))) | |
1031 | return -EFAULT; | |
1032 | copy_to_user((struct m68k_serial *) arg, | |
1033 | info, sizeof(struct m68k_serial)); | |
1034 | return 0; | |
1035 | ||
1036 | default: | |
1037 | return -ENOIOCTLCMD; | |
1038 | } | |
1039 | return 0; | |
1040 | } | |
1041 | ||
606d099c | 1042 | static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
1da177e4 LT |
1043 | { |
1044 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
1045 | ||
1da177e4 LT |
1046 | change_speed(info); |
1047 | ||
1048 | if ((old_termios->c_cflag & CRTSCTS) && | |
1049 | !(tty->termios->c_cflag & CRTSCTS)) { | |
1050 | tty->hw_stopped = 0; | |
1051 | rs_start(tty); | |
1052 | } | |
1053 | ||
1054 | } | |
1055 | ||
1056 | /* | |
1057 | * ------------------------------------------------------------ | |
1058 | * rs_close() | |
1059 | * | |
1060 | * This routine is called when the serial port gets closed. First, we | |
1061 | * wait for the last remaining data to be sent. Then, we unlink its | |
1062 | * S structure from the interrupt chain if necessary, and we free | |
1063 | * that IRQ if nothing is left in the chain. | |
1064 | * ------------------------------------------------------------ | |
1065 | */ | |
1066 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
1067 | { | |
1068 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1069 | m68328_uart *uart = &uart_addr[info->line]; | |
1070 | unsigned long flags; | |
1071 | ||
1072 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) | |
1073 | return; | |
1074 | ||
727dda80 | 1075 | local_irq_save(flags); |
1da177e4 LT |
1076 | |
1077 | if (tty_hung_up_p(filp)) { | |
727dda80 | 1078 | local_irq_restore(flags); |
1da177e4 LT |
1079 | return; |
1080 | } | |
1081 | ||
1082 | if ((tty->count == 1) && (info->count != 1)) { | |
1083 | /* | |
1084 | * Uh, oh. tty->count is 1, which means that the tty | |
1085 | * structure will be freed. Info->count should always | |
1086 | * be one in these conditions. If it's greater than | |
1087 | * one, we've got real problems, since it means the | |
1088 | * serial port won't be shutdown. | |
1089 | */ | |
1090 | printk("rs_close: bad serial port count; tty->count is 1, " | |
1091 | "info->count is %d\n", info->count); | |
1092 | info->count = 1; | |
1093 | } | |
1094 | if (--info->count < 0) { | |
1095 | printk("rs_close: bad serial port count for ttyS%d: %d\n", | |
1096 | info->line, info->count); | |
1097 | info->count = 0; | |
1098 | } | |
1099 | if (info->count) { | |
727dda80 | 1100 | local_irq_restore(flags); |
1da177e4 LT |
1101 | return; |
1102 | } | |
1103 | info->flags |= S_CLOSING; | |
1104 | /* | |
1105 | * Now we wait for the transmit buffer to clear; and we notify | |
1106 | * the line discipline to only process XON/XOFF characters. | |
1107 | */ | |
1108 | tty->closing = 1; | |
1109 | if (info->closing_wait != S_CLOSING_WAIT_NONE) | |
1110 | tty_wait_until_sent(tty, info->closing_wait); | |
1111 | /* | |
1112 | * At this point we stop accepting input. To do this, we | |
1113 | * disable the receive line status interrupts, and tell the | |
1114 | * interrupt driver to stop checking the data ready bit in the | |
1115 | * line status register. | |
1116 | */ | |
1117 | ||
1118 | uart->ustcnt &= ~USTCNT_RXEN; | |
1119 | uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK); | |
1120 | ||
1121 | shutdown(info); | |
978e595f | 1122 | rs_flush_buffer(tty); |
1da177e4 LT |
1123 | |
1124 | tty_ldisc_flush(tty); | |
1125 | tty->closing = 0; | |
1126 | info->event = 0; | |
a88487c7 | 1127 | info->port.tty = NULL; |
1da177e4 LT |
1128 | #warning "This is not and has never been valid so fix it" |
1129 | #if 0 | |
1130 | if (tty->ldisc.num != ldiscs[N_TTY].num) { | |
1131 | if (tty->ldisc.close) | |
1132 | (tty->ldisc.close)(tty); | |
1133 | tty->ldisc = ldiscs[N_TTY]; | |
1134 | tty->termios->c_line = N_TTY; | |
1135 | if (tty->ldisc.open) | |
1136 | (tty->ldisc.open)(tty); | |
1137 | } | |
1138 | #endif | |
1139 | if (info->blocked_open) { | |
1140 | if (info->close_delay) { | |
1141 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); | |
1142 | } | |
1143 | wake_up_interruptible(&info->open_wait); | |
1144 | } | |
1145 | info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING); | |
1146 | wake_up_interruptible(&info->close_wait); | |
727dda80 | 1147 | local_irq_restore(flags); |
1da177e4 LT |
1148 | } |
1149 | ||
1150 | /* | |
1151 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
1152 | */ | |
1153 | void rs_hangup(struct tty_struct *tty) | |
1154 | { | |
1155 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1156 | ||
1157 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) | |
1158 | return; | |
1159 | ||
1160 | rs_flush_buffer(tty); | |
1161 | shutdown(info); | |
1162 | info->event = 0; | |
1163 | info->count = 0; | |
1164 | info->flags &= ~S_NORMAL_ACTIVE; | |
a88487c7 | 1165 | info->port.tty = NULL; |
1da177e4 LT |
1166 | wake_up_interruptible(&info->open_wait); |
1167 | } | |
1168 | ||
1169 | /* | |
1170 | * ------------------------------------------------------------ | |
1171 | * rs_open() and friends | |
1172 | * ------------------------------------------------------------ | |
1173 | */ | |
1174 | static int block_til_ready(struct tty_struct *tty, struct file * filp, | |
1175 | struct m68k_serial *info) | |
1176 | { | |
1177 | DECLARE_WAITQUEUE(wait, current); | |
1178 | int retval; | |
1179 | int do_clocal = 0; | |
1180 | ||
1181 | /* | |
1182 | * If the device is in the middle of being closed, then block | |
1183 | * until it's done, and then try again. | |
1184 | */ | |
1185 | if (info->flags & S_CLOSING) { | |
1186 | interruptible_sleep_on(&info->close_wait); | |
1187 | #ifdef SERIAL_DO_RESTART | |
1188 | if (info->flags & S_HUP_NOTIFY) | |
1189 | return -EAGAIN; | |
1190 | else | |
1191 | return -ERESTARTSYS; | |
1192 | #else | |
1193 | return -EAGAIN; | |
1194 | #endif | |
1195 | } | |
1196 | ||
1197 | /* | |
1198 | * If non-blocking mode is set, or the port is not enabled, | |
1199 | * then make the check up front and then exit. | |
1200 | */ | |
1201 | if ((filp->f_flags & O_NONBLOCK) || | |
1202 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
1203 | info->flags |= S_NORMAL_ACTIVE; | |
1204 | return 0; | |
1205 | } | |
1206 | ||
1207 | if (tty->termios->c_cflag & CLOCAL) | |
1208 | do_clocal = 1; | |
1209 | ||
1210 | /* | |
1211 | * Block waiting for the carrier detect and the line to become | |
1212 | * free (i.e., not in use by the callout). While we are in | |
1213 | * this loop, info->count is dropped by one, so that | |
1214 | * rs_close() knows when to free things. We restore it upon | |
1215 | * exit, either normal or abnormal. | |
1216 | */ | |
1217 | retval = 0; | |
1218 | add_wait_queue(&info->open_wait, &wait); | |
1219 | ||
1220 | info->count--; | |
1221 | info->blocked_open++; | |
1222 | while (1) { | |
727dda80 | 1223 | local_irq_disable(); |
1da177e4 | 1224 | m68k_rtsdtr(info, 1); |
727dda80 | 1225 | local_irq_enable(); |
1da177e4 LT |
1226 | current->state = TASK_INTERRUPTIBLE; |
1227 | if (tty_hung_up_p(filp) || | |
1228 | !(info->flags & S_INITIALIZED)) { | |
1229 | #ifdef SERIAL_DO_RESTART | |
1230 | if (info->flags & S_HUP_NOTIFY) | |
1231 | retval = -EAGAIN; | |
1232 | else | |
1233 | retval = -ERESTARTSYS; | |
1234 | #else | |
1235 | retval = -EAGAIN; | |
1236 | #endif | |
1237 | break; | |
1238 | } | |
1239 | if (!(info->flags & S_CLOSING) && do_clocal) | |
1240 | break; | |
1241 | if (signal_pending(current)) { | |
1242 | retval = -ERESTARTSYS; | |
1243 | break; | |
1244 | } | |
1245 | schedule(); | |
1246 | } | |
1247 | current->state = TASK_RUNNING; | |
1248 | remove_wait_queue(&info->open_wait, &wait); | |
1249 | if (!tty_hung_up_p(filp)) | |
1250 | info->count++; | |
1251 | info->blocked_open--; | |
1252 | ||
1253 | if (retval) | |
1254 | return retval; | |
1255 | info->flags |= S_NORMAL_ACTIVE; | |
1256 | return 0; | |
1257 | } | |
1258 | ||
1259 | /* | |
1260 | * This routine is called whenever a serial port is opened. It | |
1261 | * enables interrupts for a serial port, linking in its S structure into | |
1262 | * the IRQ chain. It also performs the serial-specific | |
1263 | * initialization for the tty structure. | |
1264 | */ | |
1265 | int rs_open(struct tty_struct *tty, struct file * filp) | |
1266 | { | |
1267 | struct m68k_serial *info; | |
1268 | int retval, line; | |
1269 | ||
1270 | line = tty->index; | |
1271 | ||
1272 | if (line >= NR_PORTS || line < 0) /* we have exactly one */ | |
1273 | return -ENODEV; | |
1274 | ||
1275 | info = &m68k_soft[line]; | |
1276 | ||
1277 | if (serial_paranoia_check(info, tty->name, "rs_open")) | |
1278 | return -ENODEV; | |
1279 | ||
1280 | info->count++; | |
1281 | tty->driver_data = info; | |
a88487c7 | 1282 | info->port.tty = tty; |
1da177e4 LT |
1283 | |
1284 | /* | |
1285 | * Start up serial port | |
1286 | */ | |
1287 | retval = startup(info); | |
1288 | if (retval) | |
1289 | return retval; | |
1290 | ||
1291 | return block_til_ready(tty, filp, info); | |
1292 | } | |
1293 | ||
1294 | /* Finally, routines used to initialize the serial driver. */ | |
1295 | ||
1296 | static void show_serial_version(void) | |
1297 | { | |
1298 | printk("MC68328 serial driver version 1.00\n"); | |
1299 | } | |
1300 | ||
b68e31d0 | 1301 | static const struct tty_operations rs_ops = { |
1da177e4 LT |
1302 | .open = rs_open, |
1303 | .close = rs_close, | |
1304 | .write = rs_write, | |
1305 | .flush_chars = rs_flush_chars, | |
1306 | .write_room = rs_write_room, | |
1307 | .chars_in_buffer = rs_chars_in_buffer, | |
1308 | .flush_buffer = rs_flush_buffer, | |
1309 | .ioctl = rs_ioctl, | |
1310 | .throttle = rs_throttle, | |
1311 | .unthrottle = rs_unthrottle, | |
1312 | .set_termios = rs_set_termios, | |
1313 | .stop = rs_stop, | |
1314 | .start = rs_start, | |
1315 | .hangup = rs_hangup, | |
1316 | .set_ldisc = rs_set_ldisc, | |
1317 | }; | |
1318 | ||
1319 | /* rs_init inits the driver */ | |
1320 | static int __init | |
1321 | rs68328_init(void) | |
1322 | { | |
1323 | int flags, i; | |
1324 | struct m68k_serial *info; | |
1325 | ||
1326 | serial_driver = alloc_tty_driver(NR_PORTS); | |
1327 | if (!serial_driver) | |
1328 | return -ENOMEM; | |
1329 | ||
1330 | show_serial_version(); | |
1331 | ||
1332 | /* Initialize the tty_driver structure */ | |
1333 | /* SPARC: Not all of this is exactly right for us. */ | |
1334 | ||
1335 | serial_driver->name = "ttyS"; | |
1336 | serial_driver->major = TTY_MAJOR; | |
1337 | serial_driver->minor_start = 64; | |
1338 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
1339 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
1340 | serial_driver->init_termios = tty_std_termios; | |
1341 | serial_driver->init_termios.c_cflag = | |
1342 | m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL; | |
1343 | serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
1344 | tty_set_operations(serial_driver, &rs_ops); | |
1345 | ||
1346 | if (tty_register_driver(serial_driver)) { | |
1347 | put_tty_driver(serial_driver); | |
1348 | printk(KERN_ERR "Couldn't register serial driver\n"); | |
1349 | return -ENOMEM; | |
1350 | } | |
1351 | ||
727dda80 | 1352 | local_irq_save(flags); |
1da177e4 LT |
1353 | |
1354 | for(i=0;i<NR_PORTS;i++) { | |
1355 | ||
1356 | info = &m68k_soft[i]; | |
1357 | info->magic = SERIAL_MAGIC; | |
1358 | info->port = (int) &uart_addr[i]; | |
a88487c7 | 1359 | info->port.tty = NULL; |
1da177e4 LT |
1360 | info->irq = uart_irqs[i]; |
1361 | info->custom_divisor = 16; | |
1362 | info->close_delay = 50; | |
1363 | info->closing_wait = 3000; | |
1364 | info->x_char = 0; | |
1365 | info->event = 0; | |
1366 | info->count = 0; | |
1367 | info->blocked_open = 0; | |
931f9cde GU |
1368 | INIT_WORK(&info->tqueue, do_softint); |
1369 | INIT_WORK(&info->tqueue_hangup, do_serial_hangup); | |
1da177e4 LT |
1370 | init_waitqueue_head(&info->open_wait); |
1371 | init_waitqueue_head(&info->close_wait); | |
1372 | info->line = i; | |
1373 | info->is_cons = 1; /* Means shortcuts work */ | |
1374 | ||
1375 | printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line, | |
1376 | info->port, info->irq); | |
1377 | printk(" is a builtin MC68328 UART\n"); | |
1378 | ||
1da177e4 LT |
1379 | #ifdef CONFIG_M68VZ328 |
1380 | if (i > 0 ) | |
1381 | PJSEL &= 0xCF; /* PSW enable second port output */ | |
1382 | #endif | |
1383 | ||
1384 | if (request_irq(uart_irqs[i], | |
1385 | rs_interrupt, | |
7c74806b | 1386 | IRQF_DISABLED, |
25db8ad5 | 1387 | "M68328_UART", info)) |
1da177e4 | 1388 | panic("Unable to attach 68328 serial interrupt\n"); |
1da177e4 | 1389 | } |
727dda80 | 1390 | local_irq_restore(flags); |
1da177e4 LT |
1391 | return 0; |
1392 | } | |
1393 | ||
1da177e4 LT |
1394 | module_init(rs68328_init); |
1395 | ||
1396 | ||
1397 | ||
1398 | static void m68328_set_baud(void) | |
1399 | { | |
1400 | unsigned short ustcnt; | |
1401 | int i; | |
1402 | ||
1403 | ustcnt = USTCNT; | |
1404 | USTCNT = ustcnt & ~USTCNT_TXEN; | |
1405 | ||
1406 | again: | |
8b505ca8 | 1407 | for (i = 0; i < ARRAY_SIZE(baud_table); i++) |
1da177e4 LT |
1408 | if (baud_table[i] == m68328_console_baud) |
1409 | break; | |
8b505ca8 | 1410 | if (i >= ARRAY_SIZE(baud_table)) { |
1da177e4 LT |
1411 | m68328_console_baud = 9600; |
1412 | goto again; | |
1413 | } | |
1414 | ||
1415 | UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
1416 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
1417 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
1418 | ustcnt |= USTCNT_8_7; | |
1419 | ustcnt |= USTCNT_TXEN; | |
1420 | USTCNT = ustcnt; | |
1421 | m68328_console_initted = 1; | |
1422 | return; | |
1423 | } | |
1424 | ||
1425 | ||
1426 | int m68328_console_setup(struct console *cp, char *arg) | |
1427 | { | |
1428 | int i, n = CONSOLE_BAUD_RATE; | |
1429 | ||
1430 | if (!cp) | |
1431 | return(-1); | |
1432 | ||
1433 | if (arg) | |
1434 | n = simple_strtoul(arg,NULL,0); | |
1435 | ||
8b505ca8 | 1436 | for (i = 0; i < ARRAY_SIZE(baud_table); i++) |
1da177e4 LT |
1437 | if (baud_table[i] == n) |
1438 | break; | |
1439 | if (i < BAUD_TABLE_SIZE) { | |
1440 | m68328_console_baud = n; | |
1441 | m68328_console_cbaud = 0; | |
1442 | if (i > 15) { | |
1443 | m68328_console_cbaud |= CBAUDEX; | |
1444 | i -= 15; | |
1445 | } | |
1446 | m68328_console_cbaud |= i; | |
1447 | } | |
1448 | ||
1449 | m68328_set_baud(); /* make sure baud rate changes */ | |
1450 | return(0); | |
1451 | } | |
1452 | ||
1453 | ||
1454 | static struct tty_driver *m68328_console_device(struct console *c, int *index) | |
1455 | { | |
1456 | *index = c->index; | |
1457 | return serial_driver; | |
1458 | } | |
1459 | ||
1460 | ||
1461 | void m68328_console_write (struct console *co, const char *str, | |
1462 | unsigned int count) | |
1463 | { | |
1464 | if (!m68328_console_initted) | |
1465 | m68328_set_baud(); | |
1466 | while (count--) { | |
1467 | if (*str == '\n') | |
1468 | rs_put_char('\r'); | |
1469 | rs_put_char( *str++ ); | |
1470 | } | |
1471 | } | |
1472 | ||
1473 | ||
1474 | static struct console m68328_driver = { | |
1475 | .name = "ttyS", | |
1476 | .write = m68328_console_write, | |
1477 | .device = m68328_console_device, | |
1478 | .setup = m68328_console_setup, | |
1479 | .flags = CON_PRINTBUFFER, | |
1480 | .index = -1, | |
1481 | }; | |
1482 | ||
1483 | ||
1484 | static int __init m68328_console_init(void) | |
1485 | { | |
1486 | register_console(&m68328_driver); | |
1487 | return 0; | |
1488 | } | |
1489 | ||
1490 | console_initcall(m68328_console_init); |