Commit | Line | Data |
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1da177e4 LT |
1 | /* 68328serial.c: Serial port driver for 68328 microcontroller |
2 | * | |
3 | * Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu> | |
4 | * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> | |
5 | * Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org> | |
6 | * Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com> | |
7 | * Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com> | |
8 | * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com> | |
9 | * | |
10 | * VZ Support/Fixes Evan Stawnyczy <e@lineo.ca> | |
11 | * Multiple UART support Daniel Potts <danielp@cse.unsw.edu.au> | |
12 | * Power management support Daniel Potts <danielp@cse.unsw.edu.au> | |
13 | * VZ Second Serial Port enable Phil Wilshire | |
14 | * 2.4/2.5 port David McCullough | |
15 | */ | |
16 | ||
17 | #include <asm/dbg.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/signal.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/timer.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/tty.h> | |
25 | #include <linux/tty_flip.h> | |
1da177e4 LT |
26 | #include <linux/major.h> |
27 | #include <linux/string.h> | |
28 | #include <linux/fcntl.h> | |
29 | #include <linux/mm.h> | |
30 | #include <linux/kernel.h> | |
31 | #include <linux/console.h> | |
32 | #include <linux/reboot.h> | |
33 | #include <linux/keyboard.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/pm.h> | |
36 | #include <linux/bitops.h> | |
37 | #include <linux/delay.h> | |
5a0e3ad6 | 38 | #include <linux/gfp.h> |
1da177e4 LT |
39 | |
40 | #include <asm/io.h> | |
41 | #include <asm/irq.h> | |
42 | #include <asm/system.h> | |
1da177e4 LT |
43 | #include <asm/delay.h> |
44 | #include <asm/uaccess.h> | |
45 | ||
46 | /* (es) */ | |
47 | /* note: perhaps we can murge these files, so that you can just | |
48 | * define 1 of them, and they can sort that out for themselves | |
49 | */ | |
50 | #if defined(CONFIG_M68EZ328) | |
51 | #include <asm/MC68EZ328.h> | |
52 | #else | |
53 | #if defined(CONFIG_M68VZ328) | |
54 | #include <asm/MC68VZ328.h> | |
55 | #else | |
56 | #include <asm/MC68328.h> | |
57 | #endif /* CONFIG_M68VZ328 */ | |
58 | #endif /* CONFIG_M68EZ328 */ | |
59 | ||
60 | #include "68328serial.h" | |
61 | ||
62 | /* Turn off usage of real serial interrupt code, to "support" Copilot */ | |
63 | #ifdef CONFIG_XCOPILOT_BUGS | |
64 | #undef USE_INTS | |
65 | #else | |
66 | #define USE_INTS | |
67 | #endif | |
68 | ||
69 | static struct m68k_serial m68k_soft[NR_PORTS]; | |
1da177e4 LT |
70 | |
71 | static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS; | |
72 | ||
73 | /* multiple ports are contiguous in memory */ | |
74 | m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR; | |
75 | ||
76 | struct tty_struct m68k_ttys; | |
77 | struct m68k_serial *m68k_consinfo = 0; | |
78 | ||
79 | #define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */ | |
80 | ||
1da177e4 LT |
81 | struct tty_driver *serial_driver; |
82 | ||
1da177e4 LT |
83 | /* number of characters left in xmit buffer before we ask for more */ |
84 | #define WAKEUP_CHARS 256 | |
85 | ||
86 | /* Debugging... DEBUG_INTR is bad to use when one of the zs | |
87 | * lines is your console ;( | |
88 | */ | |
89 | #undef SERIAL_DEBUG_INTR | |
90 | #undef SERIAL_DEBUG_OPEN | |
91 | #undef SERIAL_DEBUG_FLOW | |
92 | ||
93 | #define RS_ISR_PASS_LIMIT 256 | |
94 | ||
1da177e4 LT |
95 | static void change_speed(struct m68k_serial *info); |
96 | ||
97 | /* | |
98 | * Setup for console. Argument comes from the boot command line. | |
99 | */ | |
100 | ||
f5e92c3f CE |
101 | /* note: this is messy, but it works, again, perhaps defined somewhere else?*/ |
102 | #ifdef CONFIG_M68VZ328 | |
103 | #define CONSOLE_BAUD_RATE 19200 | |
104 | #define DEFAULT_CBAUD B19200 | |
1da177e4 LT |
105 | #endif |
106 | ||
f5e92c3f | 107 | |
1da177e4 LT |
108 | #ifndef CONSOLE_BAUD_RATE |
109 | #define CONSOLE_BAUD_RATE 9600 | |
110 | #define DEFAULT_CBAUD B9600 | |
111 | #endif | |
112 | ||
113 | ||
114 | static int m68328_console_initted = 0; | |
115 | static int m68328_console_baud = CONSOLE_BAUD_RATE; | |
116 | static int m68328_console_cbaud = DEFAULT_CBAUD; | |
117 | ||
118 | ||
1da177e4 LT |
119 | static inline int serial_paranoia_check(struct m68k_serial *info, |
120 | char *name, const char *routine) | |
121 | { | |
122 | #ifdef SERIAL_PARANOIA_CHECK | |
123 | static const char *badmagic = | |
124 | "Warning: bad magic number for serial struct %s in %s\n"; | |
125 | static const char *badinfo = | |
126 | "Warning: null m68k_serial for %s in %s\n"; | |
127 | ||
128 | if (!info) { | |
129 | printk(badinfo, name, routine); | |
130 | return 1; | |
131 | } | |
132 | if (info->magic != SERIAL_MAGIC) { | |
133 | printk(badmagic, name, routine); | |
134 | return 1; | |
135 | } | |
136 | #endif | |
137 | return 0; | |
138 | } | |
139 | ||
140 | /* | |
141 | * This is used to figure out the divisor speeds and the timeouts | |
142 | */ | |
143 | static int baud_table[] = { | |
144 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, | |
145 | 9600, 19200, 38400, 57600, 115200, 0 }; | |
146 | ||
1da177e4 LT |
147 | /* Sets or clears DTR/RTS on the requested line */ |
148 | static inline void m68k_rtsdtr(struct m68k_serial *ss, int set) | |
149 | { | |
150 | if (set) { | |
151 | /* set the RTS/CTS line */ | |
152 | } else { | |
153 | /* clear it */ | |
154 | } | |
155 | return; | |
156 | } | |
157 | ||
158 | /* Utility routines */ | |
159 | static inline int get_baud(struct m68k_serial *ss) | |
160 | { | |
161 | unsigned long result = 115200; | |
162 | unsigned short int baud = uart_addr[ss->line].ubaud; | |
163 | if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400; | |
164 | result >>= GET_FIELD(baud, UBAUD_DIVIDE); | |
165 | ||
166 | return result; | |
167 | } | |
168 | ||
169 | /* | |
170 | * ------------------------------------------------------------ | |
171 | * rs_stop() and rs_start() | |
172 | * | |
173 | * This routines are called before setting or resetting tty->stopped. | |
174 | * They enable or disable transmitter interrupts, as necessary. | |
175 | * ------------------------------------------------------------ | |
176 | */ | |
177 | static void rs_stop(struct tty_struct *tty) | |
178 | { | |
179 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
180 | m68328_uart *uart = &uart_addr[info->line]; | |
181 | unsigned long flags; | |
182 | ||
183 | if (serial_paranoia_check(info, tty->name, "rs_stop")) | |
184 | return; | |
185 | ||
727dda80 | 186 | local_irq_save(flags); |
1da177e4 | 187 | uart->ustcnt &= ~USTCNT_TXEN; |
727dda80 | 188 | local_irq_restore(flags); |
1da177e4 LT |
189 | } |
190 | ||
09a6ffa8 | 191 | static int rs_put_char(char ch) |
1da177e4 LT |
192 | { |
193 | int flags, loops = 0; | |
194 | ||
727dda80 | 195 | local_irq_save(flags); |
1da177e4 LT |
196 | |
197 | while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) { | |
198 | loops++; | |
199 | udelay(5); | |
200 | } | |
201 | ||
202 | UTX_TXDATA = ch; | |
203 | udelay(5); | |
727dda80 | 204 | local_irq_restore(flags); |
09a6ffa8 | 205 | return 1; |
1da177e4 LT |
206 | } |
207 | ||
208 | static void rs_start(struct tty_struct *tty) | |
209 | { | |
210 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
211 | m68328_uart *uart = &uart_addr[info->line]; | |
212 | unsigned long flags; | |
213 | ||
214 | if (serial_paranoia_check(info, tty->name, "rs_start")) | |
215 | return; | |
216 | ||
727dda80 | 217 | local_irq_save(flags); |
1da177e4 LT |
218 | if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) { |
219 | #ifdef USE_INTS | |
220 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
221 | #else | |
222 | uart->ustcnt |= USTCNT_TXEN; | |
223 | #endif | |
224 | } | |
727dda80 | 225 | local_irq_restore(flags); |
1da177e4 LT |
226 | } |
227 | ||
228 | /* Drop into either the boot monitor or kadb upon receiving a break | |
229 | * from keyboard/console input. | |
230 | */ | |
231 | static void batten_down_hatches(void) | |
232 | { | |
233 | /* Drop into the debugger */ | |
234 | } | |
235 | ||
41c28ff1 | 236 | static void status_handle(struct m68k_serial *info, unsigned short status) |
1da177e4 LT |
237 | { |
238 | #if 0 | |
239 | if(status & DCD) { | |
a88487c7 | 240 | if((info->port.tty->termios->c_cflag & CRTSCTS) && |
1da177e4 LT |
241 | ((info->curregs[3] & AUTO_ENAB)==0)) { |
242 | info->curregs[3] |= AUTO_ENAB; | |
243 | info->pendregs[3] |= AUTO_ENAB; | |
244 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
245 | } | |
246 | } else { | |
247 | if((info->curregs[3] & AUTO_ENAB)) { | |
248 | info->curregs[3] &= ~AUTO_ENAB; | |
249 | info->pendregs[3] &= ~AUTO_ENAB; | |
250 | write_zsreg(info->m68k_channel, 3, info->curregs[3]); | |
251 | } | |
252 | } | |
253 | #endif | |
254 | /* If this is console input and this is a | |
255 | * 'break asserted' status change interrupt | |
256 | * see if we can drop into the debugger | |
257 | */ | |
258 | if((status & URX_BREAK) && info->break_abort) | |
259 | batten_down_hatches(); | |
260 | return; | |
261 | } | |
262 | ||
7d12e780 | 263 | static void receive_chars(struct m68k_serial *info, unsigned short rx) |
1da177e4 | 264 | { |
a88487c7 | 265 | struct tty_struct *tty = info->port.tty; |
1da177e4 | 266 | m68328_uart *uart = &uart_addr[info->line]; |
33f0f88f | 267 | unsigned char ch, flag; |
1da177e4 LT |
268 | |
269 | /* | |
270 | * This do { } while() loop will get ALL chars out of Rx FIFO | |
271 | */ | |
272 | #ifndef CONFIG_XCOPILOT_BUGS | |
273 | do { | |
274 | #endif | |
275 | ch = GET_FIELD(rx, URX_RXDATA); | |
276 | ||
277 | if(info->is_cons) { | |
278 | if(URX_BREAK & rx) { /* whee, break received */ | |
279 | status_handle(info, rx); | |
280 | return; | |
281 | #ifdef CONFIG_MAGIC_SYSRQ | |
282 | } else if (ch == 0x10) { /* ^P */ | |
283 | show_state(); | |
284 | show_free_areas(); | |
285 | show_buffers(); | |
286 | /* show_net_buffers(); */ | |
287 | return; | |
288 | } else if (ch == 0x12) { /* ^R */ | |
804ebf46 | 289 | emergency_restart(); |
1da177e4 LT |
290 | return; |
291 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
292 | } | |
1da177e4 LT |
293 | } |
294 | ||
295 | if(!tty) | |
296 | goto clear_and_exit; | |
297 | ||
33f0f88f AC |
298 | flag = TTY_NORMAL; |
299 | ||
1da177e4 | 300 | if(rx & URX_PARITY_ERROR) { |
33f0f88f | 301 | flag = TTY_PARITY; |
1da177e4 LT |
302 | status_handle(info, rx); |
303 | } else if(rx & URX_OVRUN) { | |
33f0f88f | 304 | flag = TTY_OVERRUN; |
1da177e4 LT |
305 | status_handle(info, rx); |
306 | } else if(rx & URX_FRAME_ERROR) { | |
33f0f88f | 307 | flag = TTY_FRAME; |
1da177e4 | 308 | status_handle(info, rx); |
1da177e4 | 309 | } |
33f0f88f | 310 | tty_insert_flip_char(tty, ch, flag); |
1da177e4 LT |
311 | #ifndef CONFIG_XCOPILOT_BUGS |
312 | } while((rx = uart->urx.w) & URX_DATA_READY); | |
313 | #endif | |
314 | ||
8e63e66b | 315 | tty_schedule_flip(tty); |
1da177e4 LT |
316 | |
317 | clear_and_exit: | |
318 | return; | |
319 | } | |
320 | ||
41c28ff1 | 321 | static void transmit_chars(struct m68k_serial *info) |
1da177e4 LT |
322 | { |
323 | m68328_uart *uart = &uart_addr[info->line]; | |
324 | ||
325 | if (info->x_char) { | |
326 | /* Send next char */ | |
327 | uart->utx.b.txdata = info->x_char; | |
328 | info->x_char = 0; | |
329 | goto clear_and_return; | |
330 | } | |
331 | ||
a88487c7 | 332 | if((info->xmit_cnt <= 0) || info->port.tty->stopped) { |
1da177e4 LT |
333 | /* That's peculiar... TX ints off */ |
334 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
335 | goto clear_and_return; | |
336 | } | |
337 | ||
338 | /* Send char */ | |
339 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
340 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
341 | info->xmit_cnt--; | |
342 | ||
343 | if (info->xmit_cnt < WAKEUP_CHARS) | |
344 | schedule_work(&info->tqueue); | |
345 | ||
346 | if(info->xmit_cnt <= 0) { | |
347 | /* All done for now... TX ints off */ | |
348 | uart->ustcnt &= ~USTCNT_TX_INTR_MASK; | |
349 | goto clear_and_return; | |
350 | } | |
351 | ||
352 | clear_and_return: | |
353 | /* Clear interrupt (should be auto)*/ | |
354 | return; | |
355 | } | |
356 | ||
357 | /* | |
358 | * This is the serial driver's generic interrupt routine | |
359 | */ | |
7d12e780 | 360 | irqreturn_t rs_interrupt(int irq, void *dev_id) |
1da177e4 | 361 | { |
25db8ad5 | 362 | struct m68k_serial *info = dev_id; |
1da177e4 LT |
363 | m68328_uart *uart; |
364 | unsigned short rx; | |
365 | unsigned short tx; | |
366 | ||
1da177e4 LT |
367 | uart = &uart_addr[info->line]; |
368 | rx = uart->urx.w; | |
369 | ||
370 | #ifdef USE_INTS | |
371 | tx = uart->utx.w; | |
372 | ||
7d12e780 | 373 | if (rx & URX_DATA_READY) receive_chars(info, rx); |
1da177e4 LT |
374 | if (tx & UTX_TX_AVAIL) transmit_chars(info); |
375 | #else | |
7d12e780 | 376 | receive_chars(info, rx); |
1da177e4 LT |
377 | #endif |
378 | return IRQ_HANDLED; | |
379 | } | |
380 | ||
931f9cde | 381 | static void do_softint(struct work_struct *work) |
1da177e4 | 382 | { |
931f9cde | 383 | struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue); |
1da177e4 LT |
384 | struct tty_struct *tty; |
385 | ||
a88487c7 | 386 | tty = info->port.tty; |
1da177e4 LT |
387 | if (!tty) |
388 | return; | |
389 | #if 0 | |
390 | if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) { | |
391 | tty_wakeup(tty); | |
392 | } | |
393 | #endif | |
394 | } | |
395 | ||
396 | /* | |
397 | * This routine is called from the scheduler tqueue when the interrupt | |
398 | * routine has signalled that a hangup has occurred. The path of | |
399 | * hangup processing is: | |
400 | * | |
401 | * serial interrupt routine -> (scheduler tqueue) -> | |
402 | * do_serial_hangup() -> tty->hangup() -> rs_hangup() | |
403 | * | |
404 | */ | |
931f9cde | 405 | static void do_serial_hangup(struct work_struct *work) |
1da177e4 | 406 | { |
931f9cde | 407 | struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue_hangup); |
1da177e4 LT |
408 | struct tty_struct *tty; |
409 | ||
a88487c7 | 410 | tty = info->port.tty; |
1da177e4 LT |
411 | if (!tty) |
412 | return; | |
413 | ||
414 | tty_hangup(tty); | |
415 | } | |
416 | ||
417 | ||
418 | static int startup(struct m68k_serial * info) | |
419 | { | |
420 | m68328_uart *uart = &uart_addr[info->line]; | |
421 | unsigned long flags; | |
422 | ||
423 | if (info->flags & S_INITIALIZED) | |
424 | return 0; | |
425 | ||
426 | if (!info->xmit_buf) { | |
427 | info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL); | |
428 | if (!info->xmit_buf) | |
429 | return -ENOMEM; | |
430 | } | |
431 | ||
727dda80 | 432 | local_irq_save(flags); |
1da177e4 LT |
433 | |
434 | /* | |
435 | * Clear the FIFO buffers and disable them | |
436 | * (they will be reenabled in change_speed()) | |
437 | */ | |
438 | ||
439 | uart->ustcnt = USTCNT_UEN; | |
440 | info->xmit_fifo_size = 1; | |
441 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN; | |
442 | (void)uart->urx.w; | |
443 | ||
444 | /* | |
445 | * Finally, enable sequencing and interrupts | |
446 | */ | |
447 | #ifdef USE_INTS | |
448 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | | |
449 | USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK; | |
450 | #else | |
451 | uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK; | |
452 | #endif | |
453 | ||
a88487c7 TI |
454 | if (info->port.tty) |
455 | clear_bit(TTY_IO_ERROR, &info->port.tty->flags); | |
1da177e4 LT |
456 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
457 | ||
458 | /* | |
459 | * and set the speed of the serial port | |
460 | */ | |
461 | ||
462 | change_speed(info); | |
463 | ||
464 | info->flags |= S_INITIALIZED; | |
727dda80 | 465 | local_irq_restore(flags); |
1da177e4 LT |
466 | return 0; |
467 | } | |
468 | ||
469 | /* | |
470 | * This routine will shutdown a serial port; interrupts are disabled, and | |
471 | * DTR is dropped if the hangup on close termio flag is on. | |
472 | */ | |
473 | static void shutdown(struct m68k_serial * info) | |
474 | { | |
475 | m68328_uart *uart = &uart_addr[info->line]; | |
476 | unsigned long flags; | |
477 | ||
478 | uart->ustcnt = 0; /* All off! */ | |
479 | if (!(info->flags & S_INITIALIZED)) | |
480 | return; | |
481 | ||
727dda80 | 482 | local_irq_save(flags); |
1da177e4 LT |
483 | |
484 | if (info->xmit_buf) { | |
485 | free_page((unsigned long) info->xmit_buf); | |
486 | info->xmit_buf = 0; | |
487 | } | |
488 | ||
a88487c7 TI |
489 | if (info->port.tty) |
490 | set_bit(TTY_IO_ERROR, &info->port.tty->flags); | |
1da177e4 LT |
491 | |
492 | info->flags &= ~S_INITIALIZED; | |
727dda80 | 493 | local_irq_restore(flags); |
1da177e4 LT |
494 | } |
495 | ||
496 | struct { | |
497 | int divisor, prescale; | |
498 | } | |
499 | #ifndef CONFIG_M68VZ328 | |
500 | hw_baud_table[18] = { | |
501 | {0,0}, /* 0 */ | |
502 | {0,0}, /* 50 */ | |
503 | {0,0}, /* 75 */ | |
504 | {0,0}, /* 110 */ | |
505 | {0,0}, /* 134 */ | |
506 | {0,0}, /* 150 */ | |
507 | {0,0}, /* 200 */ | |
508 | {7,0x26}, /* 300 */ | |
509 | {6,0x26}, /* 600 */ | |
510 | {5,0x26}, /* 1200 */ | |
511 | {0,0}, /* 1800 */ | |
512 | {4,0x26}, /* 2400 */ | |
513 | {3,0x26}, /* 4800 */ | |
514 | {2,0x26}, /* 9600 */ | |
515 | {1,0x26}, /* 19200 */ | |
516 | {0,0x26}, /* 38400 */ | |
517 | {1,0x38}, /* 57600 */ | |
518 | {0,0x38}, /* 115200 */ | |
519 | }; | |
520 | #else | |
521 | hw_baud_table[18] = { | |
522 | {0,0}, /* 0 */ | |
523 | {0,0}, /* 50 */ | |
524 | {0,0}, /* 75 */ | |
525 | {0,0}, /* 110 */ | |
526 | {0,0}, /* 134 */ | |
527 | {0,0}, /* 150 */ | |
528 | {0,0}, /* 200 */ | |
529 | {0,0}, /* 300 */ | |
530 | {7,0x26}, /* 600 */ | |
531 | {6,0x26}, /* 1200 */ | |
532 | {0,0}, /* 1800 */ | |
533 | {5,0x26}, /* 2400 */ | |
534 | {4,0x26}, /* 4800 */ | |
535 | {3,0x26}, /* 9600 */ | |
536 | {2,0x26}, /* 19200 */ | |
537 | {1,0x26}, /* 38400 */ | |
538 | {0,0x26}, /* 57600 */ | |
539 | {1,0x38}, /* 115200 */ | |
540 | }; | |
541 | #endif | |
542 | /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */ | |
543 | ||
544 | /* | |
545 | * This routine is called to set the UART divisor registers to match | |
546 | * the specified baud rate for a serial port. | |
547 | */ | |
548 | static void change_speed(struct m68k_serial *info) | |
549 | { | |
550 | m68328_uart *uart = &uart_addr[info->line]; | |
551 | unsigned short port; | |
552 | unsigned short ustcnt; | |
553 | unsigned cflag; | |
554 | int i; | |
555 | ||
a88487c7 | 556 | if (!info->port.tty || !info->port.tty->termios) |
1da177e4 | 557 | return; |
a88487c7 | 558 | cflag = info->port.tty->termios->c_cflag; |
1da177e4 LT |
559 | if (!(port = info->port)) |
560 | return; | |
561 | ||
562 | ustcnt = uart->ustcnt; | |
563 | uart->ustcnt = ustcnt & ~USTCNT_TXEN; | |
564 | ||
565 | i = cflag & CBAUD; | |
566 | if (i & CBAUDEX) { | |
567 | i = (i & ~CBAUDEX) + B38400; | |
568 | } | |
569 | ||
570 | info->baud = baud_table[i]; | |
571 | uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
572 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
573 | ||
574 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
575 | ||
576 | if ((cflag & CSIZE) == CS8) | |
577 | ustcnt |= USTCNT_8_7; | |
578 | ||
579 | if (cflag & CSTOPB) | |
580 | ustcnt |= USTCNT_STOP; | |
581 | ||
582 | if (cflag & PARENB) | |
583 | ustcnt |= USTCNT_PARITYEN; | |
584 | if (cflag & PARODD) | |
585 | ustcnt |= USTCNT_ODD_EVEN; | |
586 | ||
587 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
588 | if (cflag & CRTSCTS) { | |
589 | uart->utx.w &= ~ UTX_NOCTS; | |
590 | } else { | |
591 | uart->utx.w |= UTX_NOCTS; | |
592 | } | |
593 | #endif | |
594 | ||
595 | ustcnt |= USTCNT_TXEN; | |
596 | ||
597 | uart->ustcnt = ustcnt; | |
598 | return; | |
599 | } | |
600 | ||
601 | /* | |
602 | * Fair output driver allows a process to speak. | |
603 | */ | |
604 | static void rs_fair_output(void) | |
605 | { | |
606 | int left; /* Output no more than that */ | |
607 | unsigned long flags; | |
608 | struct m68k_serial *info = &m68k_soft[0]; | |
609 | char c; | |
610 | ||
611 | if (info == 0) return; | |
612 | if (info->xmit_buf == 0) return; | |
613 | ||
727dda80 | 614 | local_irq_save(flags); |
1da177e4 LT |
615 | left = info->xmit_cnt; |
616 | while (left != 0) { | |
617 | c = info->xmit_buf[info->xmit_tail]; | |
618 | info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1); | |
619 | info->xmit_cnt--; | |
727dda80 | 620 | local_irq_restore(flags); |
1da177e4 LT |
621 | |
622 | rs_put_char(c); | |
623 | ||
727dda80 | 624 | local_irq_save(flags); |
1da177e4 LT |
625 | left = min(info->xmit_cnt, left-1); |
626 | } | |
627 | ||
628 | /* Last character is being transmitted now (hopefully). */ | |
629 | udelay(5); | |
630 | ||
727dda80 | 631 | local_irq_restore(flags); |
1da177e4 LT |
632 | return; |
633 | } | |
634 | ||
635 | /* | |
636 | * m68k_console_print is registered for printk. | |
637 | */ | |
638 | void console_print_68328(const char *p) | |
639 | { | |
640 | char c; | |
641 | ||
642 | while((c=*(p++)) != 0) { | |
643 | if(c == '\n') | |
644 | rs_put_char('\r'); | |
645 | rs_put_char(c); | |
646 | } | |
647 | ||
648 | /* Comment this if you want to have a strict interrupt-driven output */ | |
649 | rs_fair_output(); | |
650 | ||
651 | return; | |
652 | } | |
653 | ||
654 | static void rs_set_ldisc(struct tty_struct *tty) | |
655 | { | |
656 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
657 | ||
658 | if (serial_paranoia_check(info, tty->name, "rs_set_ldisc")) | |
659 | return; | |
660 | ||
661 | info->is_cons = (tty->termios->c_line == N_TTY); | |
662 | ||
663 | printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off"); | |
664 | } | |
665 | ||
666 | static void rs_flush_chars(struct tty_struct *tty) | |
667 | { | |
668 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
669 | m68328_uart *uart = &uart_addr[info->line]; | |
670 | unsigned long flags; | |
671 | ||
672 | if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) | |
673 | return; | |
674 | #ifndef USE_INTS | |
675 | for(;;) { | |
676 | #endif | |
677 | ||
678 | /* Enable transmitter */ | |
727dda80 | 679 | local_irq_save(flags); |
1da177e4 LT |
680 | |
681 | if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || | |
682 | !info->xmit_buf) { | |
727dda80 | 683 | local_irq_restore(flags); |
1da177e4 LT |
684 | return; |
685 | } | |
686 | ||
687 | #ifdef USE_INTS | |
688 | uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK; | |
689 | #else | |
690 | uart->ustcnt |= USTCNT_TXEN; | |
691 | #endif | |
692 | ||
693 | #ifdef USE_INTS | |
694 | if (uart->utx.w & UTX_TX_AVAIL) { | |
695 | #else | |
696 | if (1) { | |
697 | #endif | |
698 | /* Send char */ | |
699 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
700 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
701 | info->xmit_cnt--; | |
702 | } | |
703 | ||
704 | #ifndef USE_INTS | |
705 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
706 | } | |
707 | #endif | |
727dda80 | 708 | local_irq_restore(flags); |
1da177e4 LT |
709 | } |
710 | ||
711 | extern void console_printn(const char * b, int count); | |
712 | ||
713 | static int rs_write(struct tty_struct * tty, | |
714 | const unsigned char *buf, int count) | |
715 | { | |
716 | int c, total = 0; | |
717 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
718 | m68328_uart *uart = &uart_addr[info->line]; | |
719 | unsigned long flags; | |
720 | ||
721 | if (serial_paranoia_check(info, tty->name, "rs_write")) | |
722 | return 0; | |
723 | ||
724 | if (!tty || !info->xmit_buf) | |
725 | return 0; | |
726 | ||
727dda80 | 727 | local_save_flags(flags); |
1da177e4 | 728 | while (1) { |
727dda80 | 729 | local_irq_disable(); |
1da177e4 LT |
730 | c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1, |
731 | SERIAL_XMIT_SIZE - info->xmit_head)); | |
727dda80 GU |
732 | local_irq_restore(flags); |
733 | ||
1da177e4 LT |
734 | if (c <= 0) |
735 | break; | |
736 | ||
737 | memcpy(info->xmit_buf + info->xmit_head, buf, c); | |
727dda80 GU |
738 | |
739 | local_irq_disable(); | |
1da177e4 LT |
740 | info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1); |
741 | info->xmit_cnt += c; | |
727dda80 | 742 | local_irq_restore(flags); |
1da177e4 LT |
743 | buf += c; |
744 | count -= c; | |
745 | total += c; | |
746 | } | |
747 | ||
748 | if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) { | |
749 | /* Enable transmitter */ | |
727dda80 | 750 | local_irq_disable(); |
1da177e4 LT |
751 | #ifndef USE_INTS |
752 | while(info->xmit_cnt) { | |
753 | #endif | |
754 | ||
755 | uart->ustcnt |= USTCNT_TXEN; | |
756 | #ifdef USE_INTS | |
757 | uart->ustcnt |= USTCNT_TX_INTR_MASK; | |
758 | #else | |
759 | while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5); | |
760 | #endif | |
761 | if (uart->utx.w & UTX_TX_AVAIL) { | |
762 | uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++]; | |
763 | info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1); | |
764 | info->xmit_cnt--; | |
765 | } | |
766 | ||
767 | #ifndef USE_INTS | |
768 | } | |
769 | #endif | |
727dda80 | 770 | local_irq_restore(flags); |
1da177e4 | 771 | } |
727dda80 | 772 | |
1da177e4 LT |
773 | return total; |
774 | } | |
775 | ||
776 | static int rs_write_room(struct tty_struct *tty) | |
777 | { | |
778 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
779 | int ret; | |
780 | ||
781 | if (serial_paranoia_check(info, tty->name, "rs_write_room")) | |
782 | return 0; | |
783 | ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1; | |
784 | if (ret < 0) | |
785 | ret = 0; | |
786 | return ret; | |
787 | } | |
788 | ||
789 | static int rs_chars_in_buffer(struct tty_struct *tty) | |
790 | { | |
791 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
792 | ||
793 | if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) | |
794 | return 0; | |
795 | return info->xmit_cnt; | |
796 | } | |
797 | ||
798 | static void rs_flush_buffer(struct tty_struct *tty) | |
799 | { | |
800 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
727dda80 | 801 | unsigned long flags; |
1da177e4 LT |
802 | |
803 | if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) | |
804 | return; | |
727dda80 | 805 | local_irq_save(flags); |
1da177e4 | 806 | info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; |
727dda80 | 807 | local_irq_restore(flags); |
1da177e4 LT |
808 | tty_wakeup(tty); |
809 | } | |
810 | ||
811 | /* | |
812 | * ------------------------------------------------------------ | |
813 | * rs_throttle() | |
814 | * | |
815 | * This routine is called by the upper-layer tty layer to signal that | |
816 | * incoming characters should be throttled. | |
817 | * ------------------------------------------------------------ | |
818 | */ | |
819 | static void rs_throttle(struct tty_struct * tty) | |
820 | { | |
821 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
822 | ||
823 | if (serial_paranoia_check(info, tty->name, "rs_throttle")) | |
824 | return; | |
825 | ||
826 | if (I_IXOFF(tty)) | |
827 | info->x_char = STOP_CHAR(tty); | |
828 | ||
829 | /* Turn off RTS line (do this atomic) */ | |
830 | } | |
831 | ||
832 | static void rs_unthrottle(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_unthrottle")) | |
837 | return; | |
838 | ||
839 | if (I_IXOFF(tty)) { | |
840 | if (info->x_char) | |
841 | info->x_char = 0; | |
842 | else | |
843 | info->x_char = START_CHAR(tty); | |
844 | } | |
845 | ||
846 | /* Assert RTS line (do this atomic) */ | |
847 | } | |
848 | ||
849 | /* | |
850 | * ------------------------------------------------------------ | |
851 | * rs_ioctl() and friends | |
852 | * ------------------------------------------------------------ | |
853 | */ | |
854 | ||
855 | static int get_serial_info(struct m68k_serial * info, | |
856 | struct serial_struct * retinfo) | |
857 | { | |
858 | struct serial_struct tmp; | |
859 | ||
860 | if (!retinfo) | |
861 | return -EFAULT; | |
862 | memset(&tmp, 0, sizeof(tmp)); | |
863 | tmp.type = info->type; | |
864 | tmp.line = info->line; | |
865 | tmp.port = info->port; | |
866 | tmp.irq = info->irq; | |
867 | tmp.flags = info->flags; | |
868 | tmp.baud_base = info->baud_base; | |
869 | tmp.close_delay = info->close_delay; | |
870 | tmp.closing_wait = info->closing_wait; | |
871 | tmp.custom_divisor = info->custom_divisor; | |
5d56356a KV |
872 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
873 | return -EFAULT; | |
874 | ||
1da177e4 LT |
875 | return 0; |
876 | } | |
877 | ||
878 | static int set_serial_info(struct m68k_serial * info, | |
879 | struct serial_struct * new_info) | |
880 | { | |
881 | struct serial_struct new_serial; | |
882 | struct m68k_serial old_info; | |
883 | int retval = 0; | |
884 | ||
885 | if (!new_info) | |
886 | return -EFAULT; | |
5d56356a KV |
887 | if (copy_from_user(&new_serial, new_info, sizeof(new_serial))) |
888 | return -EFAULT; | |
1da177e4 LT |
889 | old_info = *info; |
890 | ||
891 | if (!capable(CAP_SYS_ADMIN)) { | |
892 | if ((new_serial.baud_base != info->baud_base) || | |
893 | (new_serial.type != info->type) || | |
894 | (new_serial.close_delay != info->close_delay) || | |
895 | ((new_serial.flags & ~S_USR_MASK) != | |
896 | (info->flags & ~S_USR_MASK))) | |
897 | return -EPERM; | |
898 | info->flags = ((info->flags & ~S_USR_MASK) | | |
899 | (new_serial.flags & S_USR_MASK)); | |
900 | info->custom_divisor = new_serial.custom_divisor; | |
901 | goto check_and_exit; | |
902 | } | |
903 | ||
904 | if (info->count > 1) | |
905 | return -EBUSY; | |
906 | ||
907 | /* | |
908 | * OK, past this point, all the error checking has been done. | |
909 | * At this point, we start making changes..... | |
910 | */ | |
911 | ||
912 | info->baud_base = new_serial.baud_base; | |
913 | info->flags = ((info->flags & ~S_FLAGS) | | |
914 | (new_serial.flags & S_FLAGS)); | |
915 | info->type = new_serial.type; | |
916 | info->close_delay = new_serial.close_delay; | |
917 | info->closing_wait = new_serial.closing_wait; | |
918 | ||
919 | check_and_exit: | |
920 | retval = startup(info); | |
921 | return retval; | |
922 | } | |
923 | ||
924 | /* | |
925 | * get_lsr_info - get line status register info | |
926 | * | |
927 | * Purpose: Let user call ioctl() to get info when the UART physically | |
928 | * is emptied. On bus types like RS485, the transmitter must | |
929 | * release the bus after transmitting. This must be done when | |
930 | * the transmit shift register is empty, not be done when the | |
931 | * transmit holding register is empty. This functionality | |
932 | * allows an RS485 driver to be written in user space. | |
933 | */ | |
934 | static int get_lsr_info(struct m68k_serial * info, unsigned int *value) | |
935 | { | |
936 | #ifdef CONFIG_SERIAL_68328_RTS_CTS | |
937 | m68328_uart *uart = &uart_addr[info->line]; | |
938 | #endif | |
939 | unsigned char status; | |
727dda80 | 940 | unsigned long flags; |
1da177e4 | 941 | |
727dda80 | 942 | local_irq_save(flags); |
1da177e4 LT |
943 | #ifdef CONFIG_SERIAL_68328_RTS_CTS |
944 | status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0; | |
945 | #else | |
946 | status = 0; | |
947 | #endif | |
727dda80 | 948 | local_irq_restore(flags); |
5d56356a | 949 | return put_user(status, value); |
1da177e4 LT |
950 | } |
951 | ||
952 | /* | |
953 | * This routine sends a break character out the serial port. | |
954 | */ | |
6a72c7ba | 955 | static void send_break(struct m68k_serial * info, unsigned int duration) |
1da177e4 LT |
956 | { |
957 | m68328_uart *uart = &uart_addr[info->line]; | |
958 | unsigned long flags; | |
959 | if (!info->port) | |
960 | return; | |
727dda80 | 961 | local_irq_save(flags); |
1da177e4 LT |
962 | #ifdef USE_INTS |
963 | uart->utx.w |= UTX_SEND_BREAK; | |
6a72c7ba | 964 | msleep_interruptible(duration); |
1da177e4 LT |
965 | uart->utx.w &= ~UTX_SEND_BREAK; |
966 | #endif | |
727dda80 | 967 | local_irq_restore(flags); |
1da177e4 LT |
968 | } |
969 | ||
970 | static int rs_ioctl(struct tty_struct *tty, struct file * file, | |
971 | unsigned int cmd, unsigned long arg) | |
972 | { | |
973 | int error; | |
974 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
975 | int retval; | |
976 | ||
977 | if (serial_paranoia_check(info, tty->name, "rs_ioctl")) | |
978 | return -ENODEV; | |
979 | ||
980 | if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && | |
981 | (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && | |
982 | (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { | |
983 | if (tty->flags & (1 << TTY_IO_ERROR)) | |
984 | return -EIO; | |
985 | } | |
986 | ||
987 | switch (cmd) { | |
988 | case TCSBRK: /* SVID version: non-zero arg --> no break */ | |
989 | retval = tty_check_change(tty); | |
990 | if (retval) | |
991 | return retval; | |
992 | tty_wait_until_sent(tty, 0); | |
993 | if (!arg) | |
6a72c7ba | 994 | send_break(info, 250); /* 1/4 second */ |
1da177e4 LT |
995 | return 0; |
996 | case TCSBRKP: /* support for POSIX tcsendbreak() */ | |
997 | retval = tty_check_change(tty); | |
998 | if (retval) | |
999 | return retval; | |
1000 | tty_wait_until_sent(tty, 0); | |
6a72c7ba | 1001 | send_break(info, arg ? arg*(100) : 250); |
1da177e4 | 1002 | return 0; |
1da177e4 | 1003 | case TIOCGSERIAL: |
5d56356a KV |
1004 | return get_serial_info(info, |
1005 | (struct serial_struct *) arg); | |
1da177e4 LT |
1006 | case TIOCSSERIAL: |
1007 | return set_serial_info(info, | |
1008 | (struct serial_struct *) arg); | |
1009 | case TIOCSERGETLSR: /* Get line status register */ | |
5d56356a | 1010 | return get_lsr_info(info, (unsigned int *) arg); |
1da177e4 | 1011 | case TIOCSERGSTRUCT: |
5d56356a KV |
1012 | if (copy_to_user((struct m68k_serial *) arg, |
1013 | info, sizeof(struct m68k_serial))) | |
1da177e4 | 1014 | return -EFAULT; |
1da177e4 | 1015 | return 0; |
1da177e4 LT |
1016 | default: |
1017 | return -ENOIOCTLCMD; | |
1018 | } | |
1019 | return 0; | |
1020 | } | |
1021 | ||
606d099c | 1022 | static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
1da177e4 LT |
1023 | { |
1024 | struct m68k_serial *info = (struct m68k_serial *)tty->driver_data; | |
1025 | ||
1da177e4 LT |
1026 | change_speed(info); |
1027 | ||
1028 | if ((old_termios->c_cflag & CRTSCTS) && | |
1029 | !(tty->termios->c_cflag & CRTSCTS)) { | |
1030 | tty->hw_stopped = 0; | |
1031 | rs_start(tty); | |
1032 | } | |
1033 | ||
1034 | } | |
1035 | ||
1036 | /* | |
1037 | * ------------------------------------------------------------ | |
1038 | * rs_close() | |
1039 | * | |
1040 | * This routine is called when the serial port gets closed. First, we | |
1041 | * wait for the last remaining data to be sent. Then, we unlink its | |
1042 | * S structure from the interrupt chain if necessary, and we free | |
1043 | * that IRQ if nothing is left in the chain. | |
1044 | * ------------------------------------------------------------ | |
1045 | */ | |
1046 | static void rs_close(struct tty_struct *tty, struct file * filp) | |
1047 | { | |
1048 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1049 | m68328_uart *uart = &uart_addr[info->line]; | |
1050 | unsigned long flags; | |
1051 | ||
1052 | if (!info || serial_paranoia_check(info, tty->name, "rs_close")) | |
1053 | return; | |
1054 | ||
727dda80 | 1055 | local_irq_save(flags); |
1da177e4 LT |
1056 | |
1057 | if (tty_hung_up_p(filp)) { | |
727dda80 | 1058 | local_irq_restore(flags); |
1da177e4 LT |
1059 | return; |
1060 | } | |
1061 | ||
1062 | if ((tty->count == 1) && (info->count != 1)) { | |
1063 | /* | |
1064 | * Uh, oh. tty->count is 1, which means that the tty | |
1065 | * structure will be freed. Info->count should always | |
1066 | * be one in these conditions. If it's greater than | |
1067 | * one, we've got real problems, since it means the | |
1068 | * serial port won't be shutdown. | |
1069 | */ | |
1070 | printk("rs_close: bad serial port count; tty->count is 1, " | |
1071 | "info->count is %d\n", info->count); | |
1072 | info->count = 1; | |
1073 | } | |
1074 | if (--info->count < 0) { | |
1075 | printk("rs_close: bad serial port count for ttyS%d: %d\n", | |
1076 | info->line, info->count); | |
1077 | info->count = 0; | |
1078 | } | |
1079 | if (info->count) { | |
727dda80 | 1080 | local_irq_restore(flags); |
1da177e4 LT |
1081 | return; |
1082 | } | |
1083 | info->flags |= S_CLOSING; | |
1084 | /* | |
1085 | * Now we wait for the transmit buffer to clear; and we notify | |
1086 | * the line discipline to only process XON/XOFF characters. | |
1087 | */ | |
1088 | tty->closing = 1; | |
1089 | if (info->closing_wait != S_CLOSING_WAIT_NONE) | |
1090 | tty_wait_until_sent(tty, info->closing_wait); | |
1091 | /* | |
1092 | * At this point we stop accepting input. To do this, we | |
1093 | * disable the receive line status interrupts, and tell the | |
1094 | * interrupt driver to stop checking the data ready bit in the | |
1095 | * line status register. | |
1096 | */ | |
1097 | ||
1098 | uart->ustcnt &= ~USTCNT_RXEN; | |
1099 | uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK); | |
1100 | ||
1101 | shutdown(info); | |
978e595f | 1102 | rs_flush_buffer(tty); |
1da177e4 LT |
1103 | |
1104 | tty_ldisc_flush(tty); | |
1105 | tty->closing = 0; | |
1106 | info->event = 0; | |
a88487c7 | 1107 | info->port.tty = NULL; |
1da177e4 LT |
1108 | #warning "This is not and has never been valid so fix it" |
1109 | #if 0 | |
1110 | if (tty->ldisc.num != ldiscs[N_TTY].num) { | |
1111 | if (tty->ldisc.close) | |
1112 | (tty->ldisc.close)(tty); | |
1113 | tty->ldisc = ldiscs[N_TTY]; | |
1114 | tty->termios->c_line = N_TTY; | |
1115 | if (tty->ldisc.open) | |
1116 | (tty->ldisc.open)(tty); | |
1117 | } | |
1118 | #endif | |
1119 | if (info->blocked_open) { | |
1120 | if (info->close_delay) { | |
1121 | msleep_interruptible(jiffies_to_msecs(info->close_delay)); | |
1122 | } | |
1123 | wake_up_interruptible(&info->open_wait); | |
1124 | } | |
1125 | info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING); | |
1126 | wake_up_interruptible(&info->close_wait); | |
727dda80 | 1127 | local_irq_restore(flags); |
1da177e4 LT |
1128 | } |
1129 | ||
1130 | /* | |
1131 | * rs_hangup() --- called by tty_hangup() when a hangup is signaled. | |
1132 | */ | |
1133 | void rs_hangup(struct tty_struct *tty) | |
1134 | { | |
1135 | struct m68k_serial * info = (struct m68k_serial *)tty->driver_data; | |
1136 | ||
1137 | if (serial_paranoia_check(info, tty->name, "rs_hangup")) | |
1138 | return; | |
1139 | ||
1140 | rs_flush_buffer(tty); | |
1141 | shutdown(info); | |
1142 | info->event = 0; | |
1143 | info->count = 0; | |
1144 | info->flags &= ~S_NORMAL_ACTIVE; | |
a88487c7 | 1145 | info->port.tty = NULL; |
1da177e4 LT |
1146 | wake_up_interruptible(&info->open_wait); |
1147 | } | |
1148 | ||
1149 | /* | |
1150 | * ------------------------------------------------------------ | |
1151 | * rs_open() and friends | |
1152 | * ------------------------------------------------------------ | |
1153 | */ | |
1154 | static int block_til_ready(struct tty_struct *tty, struct file * filp, | |
1155 | struct m68k_serial *info) | |
1156 | { | |
1157 | DECLARE_WAITQUEUE(wait, current); | |
1158 | int retval; | |
1159 | int do_clocal = 0; | |
1160 | ||
1161 | /* | |
1162 | * If the device is in the middle of being closed, then block | |
1163 | * until it's done, and then try again. | |
1164 | */ | |
1165 | if (info->flags & S_CLOSING) { | |
1166 | interruptible_sleep_on(&info->close_wait); | |
1167 | #ifdef SERIAL_DO_RESTART | |
1168 | if (info->flags & S_HUP_NOTIFY) | |
1169 | return -EAGAIN; | |
1170 | else | |
1171 | return -ERESTARTSYS; | |
1172 | #else | |
1173 | return -EAGAIN; | |
1174 | #endif | |
1175 | } | |
1176 | ||
1177 | /* | |
1178 | * If non-blocking mode is set, or the port is not enabled, | |
1179 | * then make the check up front and then exit. | |
1180 | */ | |
1181 | if ((filp->f_flags & O_NONBLOCK) || | |
1182 | (tty->flags & (1 << TTY_IO_ERROR))) { | |
1183 | info->flags |= S_NORMAL_ACTIVE; | |
1184 | return 0; | |
1185 | } | |
1186 | ||
1187 | if (tty->termios->c_cflag & CLOCAL) | |
1188 | do_clocal = 1; | |
1189 | ||
1190 | /* | |
1191 | * Block waiting for the carrier detect and the line to become | |
1192 | * free (i.e., not in use by the callout). While we are in | |
1193 | * this loop, info->count is dropped by one, so that | |
1194 | * rs_close() knows when to free things. We restore it upon | |
1195 | * exit, either normal or abnormal. | |
1196 | */ | |
1197 | retval = 0; | |
1198 | add_wait_queue(&info->open_wait, &wait); | |
1199 | ||
1200 | info->count--; | |
1201 | info->blocked_open++; | |
1202 | while (1) { | |
727dda80 | 1203 | local_irq_disable(); |
1da177e4 | 1204 | m68k_rtsdtr(info, 1); |
727dda80 | 1205 | local_irq_enable(); |
1da177e4 LT |
1206 | current->state = TASK_INTERRUPTIBLE; |
1207 | if (tty_hung_up_p(filp) || | |
1208 | !(info->flags & S_INITIALIZED)) { | |
1209 | #ifdef SERIAL_DO_RESTART | |
1210 | if (info->flags & S_HUP_NOTIFY) | |
1211 | retval = -EAGAIN; | |
1212 | else | |
1213 | retval = -ERESTARTSYS; | |
1214 | #else | |
1215 | retval = -EAGAIN; | |
1216 | #endif | |
1217 | break; | |
1218 | } | |
1219 | if (!(info->flags & S_CLOSING) && do_clocal) | |
1220 | break; | |
1221 | if (signal_pending(current)) { | |
1222 | retval = -ERESTARTSYS; | |
1223 | break; | |
1224 | } | |
e142a31d | 1225 | tty_unlock(); |
1da177e4 | 1226 | schedule(); |
e142a31d | 1227 | tty_lock(); |
1da177e4 LT |
1228 | } |
1229 | current->state = TASK_RUNNING; | |
1230 | remove_wait_queue(&info->open_wait, &wait); | |
1231 | if (!tty_hung_up_p(filp)) | |
1232 | info->count++; | |
1233 | info->blocked_open--; | |
1234 | ||
1235 | if (retval) | |
1236 | return retval; | |
1237 | info->flags |= S_NORMAL_ACTIVE; | |
1238 | return 0; | |
1239 | } | |
1240 | ||
1241 | /* | |
1242 | * This routine is called whenever a serial port is opened. It | |
1243 | * enables interrupts for a serial port, linking in its S structure into | |
1244 | * the IRQ chain. It also performs the serial-specific | |
1245 | * initialization for the tty structure. | |
1246 | */ | |
1247 | int rs_open(struct tty_struct *tty, struct file * filp) | |
1248 | { | |
1249 | struct m68k_serial *info; | |
1250 | int retval, line; | |
1251 | ||
1252 | line = tty->index; | |
1253 | ||
1254 | if (line >= NR_PORTS || line < 0) /* we have exactly one */ | |
1255 | return -ENODEV; | |
1256 | ||
1257 | info = &m68k_soft[line]; | |
1258 | ||
1259 | if (serial_paranoia_check(info, tty->name, "rs_open")) | |
1260 | return -ENODEV; | |
1261 | ||
1262 | info->count++; | |
1263 | tty->driver_data = info; | |
a88487c7 | 1264 | info->port.tty = tty; |
1da177e4 LT |
1265 | |
1266 | /* | |
1267 | * Start up serial port | |
1268 | */ | |
1269 | retval = startup(info); | |
1270 | if (retval) | |
1271 | return retval; | |
1272 | ||
1273 | return block_til_ready(tty, filp, info); | |
1274 | } | |
1275 | ||
1276 | /* Finally, routines used to initialize the serial driver. */ | |
1277 | ||
1278 | static void show_serial_version(void) | |
1279 | { | |
1280 | printk("MC68328 serial driver version 1.00\n"); | |
1281 | } | |
1282 | ||
b68e31d0 | 1283 | static const struct tty_operations rs_ops = { |
1da177e4 LT |
1284 | .open = rs_open, |
1285 | .close = rs_close, | |
1286 | .write = rs_write, | |
1287 | .flush_chars = rs_flush_chars, | |
1288 | .write_room = rs_write_room, | |
1289 | .chars_in_buffer = rs_chars_in_buffer, | |
1290 | .flush_buffer = rs_flush_buffer, | |
1291 | .ioctl = rs_ioctl, | |
1292 | .throttle = rs_throttle, | |
1293 | .unthrottle = rs_unthrottle, | |
1294 | .set_termios = rs_set_termios, | |
1295 | .stop = rs_stop, | |
1296 | .start = rs_start, | |
1297 | .hangup = rs_hangup, | |
1298 | .set_ldisc = rs_set_ldisc, | |
1299 | }; | |
1300 | ||
1301 | /* rs_init inits the driver */ | |
1302 | static int __init | |
1303 | rs68328_init(void) | |
1304 | { | |
1305 | int flags, i; | |
1306 | struct m68k_serial *info; | |
1307 | ||
1308 | serial_driver = alloc_tty_driver(NR_PORTS); | |
1309 | if (!serial_driver) | |
1310 | return -ENOMEM; | |
1311 | ||
1312 | show_serial_version(); | |
1313 | ||
1314 | /* Initialize the tty_driver structure */ | |
1315 | /* SPARC: Not all of this is exactly right for us. */ | |
1316 | ||
1317 | serial_driver->name = "ttyS"; | |
1318 | serial_driver->major = TTY_MAJOR; | |
1319 | serial_driver->minor_start = 64; | |
1320 | serial_driver->type = TTY_DRIVER_TYPE_SERIAL; | |
1321 | serial_driver->subtype = SERIAL_TYPE_NORMAL; | |
1322 | serial_driver->init_termios = tty_std_termios; | |
1323 | serial_driver->init_termios.c_cflag = | |
1324 | m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL; | |
1325 | serial_driver->flags = TTY_DRIVER_REAL_RAW; | |
1326 | tty_set_operations(serial_driver, &rs_ops); | |
1327 | ||
1328 | if (tty_register_driver(serial_driver)) { | |
1329 | put_tty_driver(serial_driver); | |
1330 | printk(KERN_ERR "Couldn't register serial driver\n"); | |
1331 | return -ENOMEM; | |
1332 | } | |
1333 | ||
727dda80 | 1334 | local_irq_save(flags); |
1da177e4 LT |
1335 | |
1336 | for(i=0;i<NR_PORTS;i++) { | |
1337 | ||
1338 | info = &m68k_soft[i]; | |
1339 | info->magic = SERIAL_MAGIC; | |
1340 | info->port = (int) &uart_addr[i]; | |
a88487c7 | 1341 | info->port.tty = NULL; |
1da177e4 LT |
1342 | info->irq = uart_irqs[i]; |
1343 | info->custom_divisor = 16; | |
1344 | info->close_delay = 50; | |
1345 | info->closing_wait = 3000; | |
1346 | info->x_char = 0; | |
1347 | info->event = 0; | |
1348 | info->count = 0; | |
1349 | info->blocked_open = 0; | |
931f9cde GU |
1350 | INIT_WORK(&info->tqueue, do_softint); |
1351 | INIT_WORK(&info->tqueue_hangup, do_serial_hangup); | |
1da177e4 LT |
1352 | init_waitqueue_head(&info->open_wait); |
1353 | init_waitqueue_head(&info->close_wait); | |
1354 | info->line = i; | |
1355 | info->is_cons = 1; /* Means shortcuts work */ | |
1356 | ||
1357 | printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line, | |
1358 | info->port, info->irq); | |
1359 | printk(" is a builtin MC68328 UART\n"); | |
1360 | ||
1da177e4 LT |
1361 | #ifdef CONFIG_M68VZ328 |
1362 | if (i > 0 ) | |
1363 | PJSEL &= 0xCF; /* PSW enable second port output */ | |
1364 | #endif | |
1365 | ||
1366 | if (request_irq(uart_irqs[i], | |
1367 | rs_interrupt, | |
7c74806b | 1368 | IRQF_DISABLED, |
25db8ad5 | 1369 | "M68328_UART", info)) |
1da177e4 | 1370 | panic("Unable to attach 68328 serial interrupt\n"); |
1da177e4 | 1371 | } |
727dda80 | 1372 | local_irq_restore(flags); |
1da177e4 LT |
1373 | return 0; |
1374 | } | |
1375 | ||
1da177e4 LT |
1376 | module_init(rs68328_init); |
1377 | ||
1378 | ||
1379 | ||
1380 | static void m68328_set_baud(void) | |
1381 | { | |
1382 | unsigned short ustcnt; | |
1383 | int i; | |
1384 | ||
1385 | ustcnt = USTCNT; | |
1386 | USTCNT = ustcnt & ~USTCNT_TXEN; | |
1387 | ||
1388 | again: | |
8b505ca8 | 1389 | for (i = 0; i < ARRAY_SIZE(baud_table); i++) |
1da177e4 LT |
1390 | if (baud_table[i] == m68328_console_baud) |
1391 | break; | |
8b505ca8 | 1392 | if (i >= ARRAY_SIZE(baud_table)) { |
1da177e4 LT |
1393 | m68328_console_baud = 9600; |
1394 | goto again; | |
1395 | } | |
1396 | ||
1397 | UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) | | |
1398 | PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale); | |
1399 | ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7); | |
1400 | ustcnt |= USTCNT_8_7; | |
1401 | ustcnt |= USTCNT_TXEN; | |
1402 | USTCNT = ustcnt; | |
1403 | m68328_console_initted = 1; | |
1404 | return; | |
1405 | } | |
1406 | ||
1407 | ||
1408 | int m68328_console_setup(struct console *cp, char *arg) | |
1409 | { | |
1410 | int i, n = CONSOLE_BAUD_RATE; | |
1411 | ||
1412 | if (!cp) | |
1413 | return(-1); | |
1414 | ||
1415 | if (arg) | |
1416 | n = simple_strtoul(arg,NULL,0); | |
1417 | ||
8b505ca8 | 1418 | for (i = 0; i < ARRAY_SIZE(baud_table); i++) |
1da177e4 LT |
1419 | if (baud_table[i] == n) |
1420 | break; | |
e9a137cb | 1421 | if (i < ARRAY_SIZE(baud_table)) { |
1da177e4 LT |
1422 | m68328_console_baud = n; |
1423 | m68328_console_cbaud = 0; | |
1424 | if (i > 15) { | |
1425 | m68328_console_cbaud |= CBAUDEX; | |
1426 | i -= 15; | |
1427 | } | |
1428 | m68328_console_cbaud |= i; | |
1429 | } | |
1430 | ||
1431 | m68328_set_baud(); /* make sure baud rate changes */ | |
1432 | return(0); | |
1433 | } | |
1434 | ||
1435 | ||
1436 | static struct tty_driver *m68328_console_device(struct console *c, int *index) | |
1437 | { | |
1438 | *index = c->index; | |
1439 | return serial_driver; | |
1440 | } | |
1441 | ||
1442 | ||
1443 | void m68328_console_write (struct console *co, const char *str, | |
1444 | unsigned int count) | |
1445 | { | |
1446 | if (!m68328_console_initted) | |
1447 | m68328_set_baud(); | |
1448 | while (count--) { | |
1449 | if (*str == '\n') | |
1450 | rs_put_char('\r'); | |
1451 | rs_put_char( *str++ ); | |
1452 | } | |
1453 | } | |
1454 | ||
1455 | ||
1456 | static struct console m68328_driver = { | |
1457 | .name = "ttyS", | |
1458 | .write = m68328_console_write, | |
1459 | .device = m68328_console_device, | |
1460 | .setup = m68328_console_setup, | |
1461 | .flags = CON_PRINTBUFFER, | |
1462 | .index = -1, | |
1463 | }; | |
1464 | ||
1465 | ||
1466 | static int __init m68328_console_init(void) | |
1467 | { | |
1468 | register_console(&m68328_driver); | |
1469 | return 0; | |
1470 | } | |
1471 | ||
1472 | console_initcall(m68328_console_init); |