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Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / tty / serial / 68328serial.c
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/serial.h>
21 #include <linux/signal.h>
22 #include <linux/sched.h>
23 #include <linux/timer.h>
24 #include <linux/interrupt.h>
25 #include <linux/tty.h>
26 #include <linux/tty_flip.h>
27 #include <linux/major.h>
28 #include <linux/string.h>
29 #include <linux/fcntl.h>
30 #include <linux/mm.h>
31 #include <linux/kernel.h>
32 #include <linux/console.h>
33 #include <linux/reboot.h>
34 #include <linux/keyboard.h>
35 #include <linux/init.h>
36 #include <linux/pm.h>
37 #include <linux/bitops.h>
38 #include <linux/delay.h>
39 #include <linux/gfp.h>
40
41 #include <asm/io.h>
42 #include <asm/irq.h>
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 /* Turn off usage of real serial interrupt code, to "support" Copilot */
61 #ifdef CONFIG_XCOPILOT_BUGS
62 #undef USE_INTS
63 #else
64 #define USE_INTS
65 #endif
66
67 /*
68 * I believe this is the optimal setting that reduces the number of interrupts.
69 * At high speeds the output might become a little "bursted" (use USTCNT_TXHE
70 * if that bothers you), but in most cases it will not, since we try to
71 * transmit characters every time rs_interrupt is called. Thus, quite often
72 * you'll see that a receive interrupt occures before the transmit one.
73 * -- Vladimir Gurevich
74 */
75 #define USTCNT_TX_INTR_MASK (USTCNT_TXEE)
76
77 /*
78 * 68328 and 68EZ328 UARTS are a little bit different. EZ328 has special
79 * "Old data interrupt" which occures whenever the data stay in the FIFO
80 * longer than 30 bits time. This allows us to use FIFO without compromising
81 * latency. '328 does not have this feature and without the real 328-based
82 * board I would assume that RXRE is the safest setting.
83 *
84 * For EZ328 I use RXHE (Half empty) interrupt to reduce the number of
85 * interrupts. RXFE (receive queue full) causes the system to lose data
86 * at least at 115200 baud
87 *
88 * If your board is busy doing other stuff, you might consider to use
89 * RXRE (data ready intrrupt) instead.
90 *
91 * The other option is to make these INTR masks run-time configurable, so
92 * that people can dynamically adapt them according to the current usage.
93 * -- Vladimir Gurevich
94 */
95
96 /* (es) */
97 #if defined(CONFIG_M68EZ328) || defined(CONFIG_M68VZ328)
98 #define USTCNT_RX_INTR_MASK (USTCNT_RXHE | USTCNT_ODEN)
99 #elif defined(CONFIG_M68328)
100 #define USTCNT_RX_INTR_MASK (USTCNT_RXRE)
101 #else
102 #error Please, define the Rx interrupt events for your CPU
103 #endif
104 /* (/es) */
105
106 /*
107 * This is our internal structure for each serial port's state.
108 */
109 struct m68k_serial {
110 struct tty_port tport;
111 char is_cons; /* Is this our console. */
112 int magic;
113 int baud_base;
114 int port;
115 int irq;
116 int type; /* UART type */
117 int custom_divisor;
118 int x_char; /* xon/xoff character */
119 int line;
120 unsigned char *xmit_buf;
121 int xmit_head;
122 int xmit_tail;
123 int xmit_cnt;
124 };
125
126 #define SERIAL_MAGIC 0x5301
127
128 /*
129 * Define the number of ports supported and their irqs.
130 */
131 #define NR_PORTS 1
132
133 static struct m68k_serial m68k_soft[NR_PORTS];
134
135 static unsigned int uart_irqs[NR_PORTS] = { UART_IRQ_NUM };
136
137 /* multiple ports are contiguous in memory */
138 m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;
139
140 struct tty_driver *serial_driver;
141
142 static void change_speed(struct m68k_serial *info, struct tty_struct *tty);
143
144 /*
145 * Setup for console. Argument comes from the boot command line.
146 */
147
148 /* note: this is messy, but it works, again, perhaps defined somewhere else?*/
149 #ifdef CONFIG_M68VZ328
150 #define CONSOLE_BAUD_RATE 19200
151 #define DEFAULT_CBAUD B19200
152 #endif
153
154
155 #ifndef CONSOLE_BAUD_RATE
156 #define CONSOLE_BAUD_RATE 9600
157 #define DEFAULT_CBAUD B9600
158 #endif
159
160
161 static int m68328_console_initted = 0;
162 static int m68328_console_baud = CONSOLE_BAUD_RATE;
163 static int m68328_console_cbaud = DEFAULT_CBAUD;
164
165
166 static inline int serial_paranoia_check(struct m68k_serial *info,
167 char *name, const char *routine)
168 {
169 #ifdef SERIAL_PARANOIA_CHECK
170 static const char *badmagic =
171 "Warning: bad magic number for serial struct %s in %s\n";
172 static const char *badinfo =
173 "Warning: null m68k_serial for %s in %s\n";
174
175 if (!info) {
176 printk(badinfo, name, routine);
177 return 1;
178 }
179 if (info->magic != SERIAL_MAGIC) {
180 printk(badmagic, name, routine);
181 return 1;
182 }
183 #endif
184 return 0;
185 }
186
187 /*
188 * This is used to figure out the divisor speeds and the timeouts
189 */
190 static int baud_table[] = {
191 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
192 9600, 19200, 38400, 57600, 115200, 0 };
193
194 /* Utility routines */
195 static inline int get_baud(struct m68k_serial *ss)
196 {
197 unsigned long result = 115200;
198 unsigned short int baud = uart_addr[ss->line].ubaud;
199 if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
200 result >>= GET_FIELD(baud, UBAUD_DIVIDE);
201
202 return result;
203 }
204
205 /*
206 * ------------------------------------------------------------
207 * rs_stop() and rs_start()
208 *
209 * This routines are called before setting or resetting tty->stopped.
210 * They enable or disable transmitter interrupts, as necessary.
211 * ------------------------------------------------------------
212 */
213 static void rs_stop(struct tty_struct *tty)
214 {
215 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
216 m68328_uart *uart = &uart_addr[info->line];
217 unsigned long flags;
218
219 if (serial_paranoia_check(info, tty->name, "rs_stop"))
220 return;
221
222 local_irq_save(flags);
223 uart->ustcnt &= ~USTCNT_TXEN;
224 local_irq_restore(flags);
225 }
226
227 static int rs_put_char(char ch)
228 {
229 unsigned long flags;
230 int loops = 0;
231
232 local_irq_save(flags);
233
234 while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
235 loops++;
236 udelay(5);
237 }
238
239 UTX_TXDATA = ch;
240 udelay(5);
241 local_irq_restore(flags);
242 return 1;
243 }
244
245 static void rs_start(struct tty_struct *tty)
246 {
247 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
248 m68328_uart *uart = &uart_addr[info->line];
249 unsigned long flags;
250
251 if (serial_paranoia_check(info, tty->name, "rs_start"))
252 return;
253
254 local_irq_save(flags);
255 if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
256 #ifdef USE_INTS
257 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
258 #else
259 uart->ustcnt |= USTCNT_TXEN;
260 #endif
261 }
262 local_irq_restore(flags);
263 }
264
265 static void receive_chars(struct m68k_serial *info, unsigned short rx)
266 {
267 m68328_uart *uart = &uart_addr[info->line];
268 unsigned char ch, flag;
269
270 /*
271 * This do { } while() loop will get ALL chars out of Rx FIFO
272 */
273 #ifndef CONFIG_XCOPILOT_BUGS
274 do {
275 #endif
276 ch = GET_FIELD(rx, URX_RXDATA);
277
278 if(info->is_cons) {
279 if(URX_BREAK & rx) { /* whee, break received */
280 return;
281 #ifdef CONFIG_MAGIC_SYSRQ
282 } else if (ch == 0x10) { /* ^P */
283 show_state();
284 show_free_areas(0);
285 show_buffers();
286 /* show_net_buffers(); */
287 return;
288 } else if (ch == 0x12) { /* ^R */
289 emergency_restart();
290 return;
291 #endif /* CONFIG_MAGIC_SYSRQ */
292 }
293 }
294
295 flag = TTY_NORMAL;
296
297 if (rx & URX_PARITY_ERROR)
298 flag = TTY_PARITY;
299 else if (rx & URX_OVRUN)
300 flag = TTY_OVERRUN;
301 else if (rx & URX_FRAME_ERROR)
302 flag = TTY_FRAME;
303
304 tty_insert_flip_char(&info->tport, ch, flag);
305 #ifndef CONFIG_XCOPILOT_BUGS
306 } while((rx = uart->urx.w) & URX_DATA_READY);
307 #endif
308
309 tty_schedule_flip(&info->tport);
310 }
311
312 static void transmit_chars(struct m68k_serial *info, struct tty_struct *tty)
313 {
314 m68328_uart *uart = &uart_addr[info->line];
315
316 if (info->x_char) {
317 /* Send next char */
318 uart->utx.b.txdata = info->x_char;
319 info->x_char = 0;
320 goto clear_and_return;
321 }
322
323 if ((info->xmit_cnt <= 0) || !tty || tty->stopped) {
324 /* That's peculiar... TX ints off */
325 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
326 goto clear_and_return;
327 }
328
329 /* Send char */
330 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
331 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
332 info->xmit_cnt--;
333
334 if(info->xmit_cnt <= 0) {
335 /* All done for now... TX ints off */
336 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
337 goto clear_and_return;
338 }
339
340 clear_and_return:
341 /* Clear interrupt (should be auto)*/
342 return;
343 }
344
345 /*
346 * This is the serial driver's generic interrupt routine
347 */
348 irqreturn_t rs_interrupt(int irq, void *dev_id)
349 {
350 struct m68k_serial *info = dev_id;
351 struct tty_struct *tty = tty_port_tty_get(&info->tport);
352 m68328_uart *uart;
353 unsigned short rx;
354 unsigned short tx;
355
356 uart = &uart_addr[info->line];
357 rx = uart->urx.w;
358
359 #ifdef USE_INTS
360 tx = uart->utx.w;
361
362 if (rx & URX_DATA_READY)
363 receive_chars(info, rx);
364 if (tx & UTX_TX_AVAIL)
365 transmit_chars(info, tty);
366 #else
367 receive_chars(info, rx);
368 #endif
369 tty_kref_put(tty);
370
371 return IRQ_HANDLED;
372 }
373
374 static int startup(struct m68k_serial *info, struct tty_struct *tty)
375 {
376 m68328_uart *uart = &uart_addr[info->line];
377 unsigned long flags;
378
379 if (info->tport.flags & ASYNC_INITIALIZED)
380 return 0;
381
382 if (!info->xmit_buf) {
383 info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
384 if (!info->xmit_buf)
385 return -ENOMEM;
386 }
387
388 local_irq_save(flags);
389
390 /*
391 * Clear the FIFO buffers and disable them
392 * (they will be reenabled in change_speed())
393 */
394
395 uart->ustcnt = USTCNT_UEN;
396 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
397 (void)uart->urx.w;
398
399 /*
400 * Finally, enable sequencing and interrupts
401 */
402 #ifdef USE_INTS
403 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN |
404 USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
405 #else
406 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
407 #endif
408
409 if (tty)
410 clear_bit(TTY_IO_ERROR, &tty->flags);
411 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
412
413 /*
414 * and set the speed of the serial port
415 */
416
417 change_speed(info, tty);
418
419 info->tport.flags |= ASYNC_INITIALIZED;
420 local_irq_restore(flags);
421 return 0;
422 }
423
424 /*
425 * This routine will shutdown a serial port; interrupts are disabled, and
426 * DTR is dropped if the hangup on close termio flag is on.
427 */
428 static void shutdown(struct m68k_serial *info, struct tty_struct *tty)
429 {
430 m68328_uart *uart = &uart_addr[info->line];
431 unsigned long flags;
432
433 uart->ustcnt = 0; /* All off! */
434 if (!(info->tport.flags & ASYNC_INITIALIZED))
435 return;
436
437 local_irq_save(flags);
438
439 if (info->xmit_buf) {
440 free_page((unsigned long) info->xmit_buf);
441 info->xmit_buf = 0;
442 }
443
444 if (tty)
445 set_bit(TTY_IO_ERROR, &tty->flags);
446
447 info->tport.flags &= ~ASYNC_INITIALIZED;
448 local_irq_restore(flags);
449 }
450
451 struct {
452 int divisor, prescale;
453 }
454 #ifndef CONFIG_M68VZ328
455 hw_baud_table[18] = {
456 {0,0}, /* 0 */
457 {0,0}, /* 50 */
458 {0,0}, /* 75 */
459 {0,0}, /* 110 */
460 {0,0}, /* 134 */
461 {0,0}, /* 150 */
462 {0,0}, /* 200 */
463 {7,0x26}, /* 300 */
464 {6,0x26}, /* 600 */
465 {5,0x26}, /* 1200 */
466 {0,0}, /* 1800 */
467 {4,0x26}, /* 2400 */
468 {3,0x26}, /* 4800 */
469 {2,0x26}, /* 9600 */
470 {1,0x26}, /* 19200 */
471 {0,0x26}, /* 38400 */
472 {1,0x38}, /* 57600 */
473 {0,0x38}, /* 115200 */
474 };
475 #else
476 hw_baud_table[18] = {
477 {0,0}, /* 0 */
478 {0,0}, /* 50 */
479 {0,0}, /* 75 */
480 {0,0}, /* 110 */
481 {0,0}, /* 134 */
482 {0,0}, /* 150 */
483 {0,0}, /* 200 */
484 {0,0}, /* 300 */
485 {7,0x26}, /* 600 */
486 {6,0x26}, /* 1200 */
487 {0,0}, /* 1800 */
488 {5,0x26}, /* 2400 */
489 {4,0x26}, /* 4800 */
490 {3,0x26}, /* 9600 */
491 {2,0x26}, /* 19200 */
492 {1,0x26}, /* 38400 */
493 {0,0x26}, /* 57600 */
494 {1,0x38}, /* 115200 */
495 };
496 #endif
497 /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
498
499 /*
500 * This routine is called to set the UART divisor registers to match
501 * the specified baud rate for a serial port.
502 */
503 static void change_speed(struct m68k_serial *info, struct tty_struct *tty)
504 {
505 m68328_uart *uart = &uart_addr[info->line];
506 unsigned short port;
507 unsigned short ustcnt;
508 unsigned cflag;
509 int i;
510
511 cflag = tty->termios.c_cflag;
512 if (!(port = info->port))
513 return;
514
515 ustcnt = uart->ustcnt;
516 uart->ustcnt = ustcnt & ~USTCNT_TXEN;
517
518 i = cflag & CBAUD;
519 if (i & CBAUDEX) {
520 i = (i & ~CBAUDEX) + B38400;
521 }
522
523 uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
524 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
525
526 ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
527
528 if ((cflag & CSIZE) == CS8)
529 ustcnt |= USTCNT_8_7;
530
531 if (cflag & CSTOPB)
532 ustcnt |= USTCNT_STOP;
533
534 if (cflag & PARENB)
535 ustcnt |= USTCNT_PARITYEN;
536 if (cflag & PARODD)
537 ustcnt |= USTCNT_ODD_EVEN;
538
539 #ifdef CONFIG_SERIAL_68328_RTS_CTS
540 if (cflag & CRTSCTS) {
541 uart->utx.w &= ~ UTX_NOCTS;
542 } else {
543 uart->utx.w |= UTX_NOCTS;
544 }
545 #endif
546
547 ustcnt |= USTCNT_TXEN;
548
549 uart->ustcnt = ustcnt;
550 return;
551 }
552
553 /*
554 * Fair output driver allows a process to speak.
555 */
556 static void rs_fair_output(void)
557 {
558 int left; /* Output no more than that */
559 unsigned long flags;
560 struct m68k_serial *info = &m68k_soft[0];
561 char c;
562
563 if (info == 0) return;
564 if (info->xmit_buf == 0) return;
565
566 local_irq_save(flags);
567 left = info->xmit_cnt;
568 while (left != 0) {
569 c = info->xmit_buf[info->xmit_tail];
570 info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
571 info->xmit_cnt--;
572 local_irq_restore(flags);
573
574 rs_put_char(c);
575
576 local_irq_save(flags);
577 left = min(info->xmit_cnt, left-1);
578 }
579
580 /* Last character is being transmitted now (hopefully). */
581 udelay(5);
582
583 local_irq_restore(flags);
584 return;
585 }
586
587 /*
588 * m68k_console_print is registered for printk.
589 */
590 void console_print_68328(const char *p)
591 {
592 char c;
593
594 while((c=*(p++)) != 0) {
595 if(c == '\n')
596 rs_put_char('\r');
597 rs_put_char(c);
598 }
599
600 /* Comment this if you want to have a strict interrupt-driven output */
601 rs_fair_output();
602
603 return;
604 }
605
606 static void rs_set_ldisc(struct tty_struct *tty)
607 {
608 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
609
610 if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
611 return;
612
613 info->is_cons = (tty->termios.c_line == N_TTY);
614
615 printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
616 }
617
618 static void rs_flush_chars(struct tty_struct *tty)
619 {
620 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
621 m68328_uart *uart = &uart_addr[info->line];
622 unsigned long flags;
623
624 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
625 return;
626 #ifndef USE_INTS
627 for(;;) {
628 #endif
629
630 /* Enable transmitter */
631 local_irq_save(flags);
632
633 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
634 !info->xmit_buf) {
635 local_irq_restore(flags);
636 return;
637 }
638
639 #ifdef USE_INTS
640 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
641 #else
642 uart->ustcnt |= USTCNT_TXEN;
643 #endif
644
645 #ifdef USE_INTS
646 if (uart->utx.w & UTX_TX_AVAIL) {
647 #else
648 if (1) {
649 #endif
650 /* Send char */
651 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
652 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
653 info->xmit_cnt--;
654 }
655
656 #ifndef USE_INTS
657 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
658 }
659 #endif
660 local_irq_restore(flags);
661 }
662
663 extern void console_printn(const char * b, int count);
664
665 static int rs_write(struct tty_struct * tty,
666 const unsigned char *buf, int count)
667 {
668 int c, total = 0;
669 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
670 m68328_uart *uart = &uart_addr[info->line];
671 unsigned long flags;
672
673 if (serial_paranoia_check(info, tty->name, "rs_write"))
674 return 0;
675
676 if (!tty || !info->xmit_buf)
677 return 0;
678
679 local_save_flags(flags);
680 while (1) {
681 local_irq_disable();
682 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
683 SERIAL_XMIT_SIZE - info->xmit_head));
684 local_irq_restore(flags);
685
686 if (c <= 0)
687 break;
688
689 memcpy(info->xmit_buf + info->xmit_head, buf, c);
690
691 local_irq_disable();
692 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
693 info->xmit_cnt += c;
694 local_irq_restore(flags);
695 buf += c;
696 count -= c;
697 total += c;
698 }
699
700 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
701 /* Enable transmitter */
702 local_irq_disable();
703 #ifndef USE_INTS
704 while(info->xmit_cnt) {
705 #endif
706
707 uart->ustcnt |= USTCNT_TXEN;
708 #ifdef USE_INTS
709 uart->ustcnt |= USTCNT_TX_INTR_MASK;
710 #else
711 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
712 #endif
713 if (uart->utx.w & UTX_TX_AVAIL) {
714 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
715 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
716 info->xmit_cnt--;
717 }
718
719 #ifndef USE_INTS
720 }
721 #endif
722 local_irq_restore(flags);
723 }
724
725 return total;
726 }
727
728 static int rs_write_room(struct tty_struct *tty)
729 {
730 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
731 int ret;
732
733 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
734 return 0;
735 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
736 if (ret < 0)
737 ret = 0;
738 return ret;
739 }
740
741 static int rs_chars_in_buffer(struct tty_struct *tty)
742 {
743 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
744
745 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
746 return 0;
747 return info->xmit_cnt;
748 }
749
750 static void rs_flush_buffer(struct tty_struct *tty)
751 {
752 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
753 unsigned long flags;
754
755 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
756 return;
757 local_irq_save(flags);
758 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
759 local_irq_restore(flags);
760 tty_wakeup(tty);
761 }
762
763 /*
764 * ------------------------------------------------------------
765 * rs_throttle()
766 *
767 * This routine is called by the upper-layer tty layer to signal that
768 * incoming characters should be throttled.
769 * ------------------------------------------------------------
770 */
771 static void rs_throttle(struct tty_struct * tty)
772 {
773 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
774
775 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
776 return;
777
778 if (I_IXOFF(tty))
779 info->x_char = STOP_CHAR(tty);
780
781 /* Turn off RTS line (do this atomic) */
782 }
783
784 static void rs_unthrottle(struct tty_struct * tty)
785 {
786 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
787
788 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
789 return;
790
791 if (I_IXOFF(tty)) {
792 if (info->x_char)
793 info->x_char = 0;
794 else
795 info->x_char = START_CHAR(tty);
796 }
797
798 /* Assert RTS line (do this atomic) */
799 }
800
801 /*
802 * ------------------------------------------------------------
803 * rs_ioctl() and friends
804 * ------------------------------------------------------------
805 */
806
807 static int get_serial_info(struct m68k_serial * info,
808 struct serial_struct * retinfo)
809 {
810 struct serial_struct tmp;
811
812 if (!retinfo)
813 return -EFAULT;
814 memset(&tmp, 0, sizeof(tmp));
815 tmp.type = info->type;
816 tmp.line = info->line;
817 tmp.port = info->port;
818 tmp.irq = info->irq;
819 tmp.flags = info->tport.flags;
820 tmp.baud_base = info->baud_base;
821 tmp.close_delay = info->tport.close_delay;
822 tmp.closing_wait = info->tport.closing_wait;
823 tmp.custom_divisor = info->custom_divisor;
824 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
825 return -EFAULT;
826
827 return 0;
828 }
829
830 static int set_serial_info(struct m68k_serial *info, struct tty_struct *tty,
831 struct serial_struct * new_info)
832 {
833 struct tty_port *port = &info->tport;
834 struct serial_struct new_serial;
835 struct m68k_serial old_info;
836 int retval = 0;
837
838 if (!new_info)
839 return -EFAULT;
840 if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
841 return -EFAULT;
842 old_info = *info;
843
844 if (!capable(CAP_SYS_ADMIN)) {
845 if ((new_serial.baud_base != info->baud_base) ||
846 (new_serial.type != info->type) ||
847 (new_serial.close_delay != port->close_delay) ||
848 ((new_serial.flags & ~ASYNC_USR_MASK) !=
849 (port->flags & ~ASYNC_USR_MASK)))
850 return -EPERM;
851 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
852 (new_serial.flags & ASYNC_USR_MASK));
853 info->custom_divisor = new_serial.custom_divisor;
854 goto check_and_exit;
855 }
856
857 if (port->count > 1)
858 return -EBUSY;
859
860 /*
861 * OK, past this point, all the error checking has been done.
862 * At this point, we start making changes.....
863 */
864
865 info->baud_base = new_serial.baud_base;
866 port->flags = ((port->flags & ~ASYNC_FLAGS) |
867 (new_serial.flags & ASYNC_FLAGS));
868 info->type = new_serial.type;
869 port->close_delay = new_serial.close_delay;
870 port->closing_wait = new_serial.closing_wait;
871
872 check_and_exit:
873 retval = startup(info, tty);
874 return retval;
875 }
876
877 /*
878 * get_lsr_info - get line status register info
879 *
880 * Purpose: Let user call ioctl() to get info when the UART physically
881 * is emptied. On bus types like RS485, the transmitter must
882 * release the bus after transmitting. This must be done when
883 * the transmit shift register is empty, not be done when the
884 * transmit holding register is empty. This functionality
885 * allows an RS485 driver to be written in user space.
886 */
887 static int get_lsr_info(struct m68k_serial * info, unsigned int *value)
888 {
889 #ifdef CONFIG_SERIAL_68328_RTS_CTS
890 m68328_uart *uart = &uart_addr[info->line];
891 #endif
892 unsigned char status;
893 unsigned long flags;
894
895 local_irq_save(flags);
896 #ifdef CONFIG_SERIAL_68328_RTS_CTS
897 status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
898 #else
899 status = 0;
900 #endif
901 local_irq_restore(flags);
902 return put_user(status, value);
903 }
904
905 /*
906 * This routine sends a break character out the serial port.
907 */
908 static void send_break(struct m68k_serial * info, unsigned int duration)
909 {
910 m68328_uart *uart = &uart_addr[info->line];
911 unsigned long flags;
912 if (!info->port)
913 return;
914 local_irq_save(flags);
915 #ifdef USE_INTS
916 uart->utx.w |= UTX_SEND_BREAK;
917 msleep_interruptible(duration);
918 uart->utx.w &= ~UTX_SEND_BREAK;
919 #endif
920 local_irq_restore(flags);
921 }
922
923 static int rs_ioctl(struct tty_struct *tty,
924 unsigned int cmd, unsigned long arg)
925 {
926 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
927 int retval;
928
929 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
930 return -ENODEV;
931
932 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
933 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
934 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
935 if (tty->flags & (1 << TTY_IO_ERROR))
936 return -EIO;
937 }
938
939 switch (cmd) {
940 case TCSBRK: /* SVID version: non-zero arg --> no break */
941 retval = tty_check_change(tty);
942 if (retval)
943 return retval;
944 tty_wait_until_sent(tty, 0);
945 if (!arg)
946 send_break(info, 250); /* 1/4 second */
947 return 0;
948 case TCSBRKP: /* support for POSIX tcsendbreak() */
949 retval = tty_check_change(tty);
950 if (retval)
951 return retval;
952 tty_wait_until_sent(tty, 0);
953 send_break(info, arg ? arg*(100) : 250);
954 return 0;
955 case TIOCGSERIAL:
956 return get_serial_info(info,
957 (struct serial_struct *) arg);
958 case TIOCSSERIAL:
959 return set_serial_info(info, tty,
960 (struct serial_struct *) arg);
961 case TIOCSERGETLSR: /* Get line status register */
962 return get_lsr_info(info, (unsigned int *) arg);
963 case TIOCSERGSTRUCT:
964 if (copy_to_user((struct m68k_serial *) arg,
965 info, sizeof(struct m68k_serial)))
966 return -EFAULT;
967 return 0;
968 default:
969 return -ENOIOCTLCMD;
970 }
971 return 0;
972 }
973
974 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
975 {
976 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
977
978 change_speed(info, tty);
979
980 if ((old_termios->c_cflag & CRTSCTS) &&
981 !(tty->termios.c_cflag & CRTSCTS)) {
982 tty->hw_stopped = 0;
983 rs_start(tty);
984 }
985
986 }
987
988 /*
989 * ------------------------------------------------------------
990 * rs_close()
991 *
992 * This routine is called when the serial port gets closed. First, we
993 * wait for the last remaining data to be sent. Then, we unlink its
994 * S structure from the interrupt chain if necessary, and we free
995 * that IRQ if nothing is left in the chain.
996 * ------------------------------------------------------------
997 */
998 static void rs_close(struct tty_struct *tty, struct file * filp)
999 {
1000 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1001 struct tty_port *port = &info->tport;
1002 m68328_uart *uart = &uart_addr[info->line];
1003 unsigned long flags;
1004
1005 if (serial_paranoia_check(info, tty->name, "rs_close"))
1006 return;
1007
1008 local_irq_save(flags);
1009
1010 if (tty_hung_up_p(filp)) {
1011 local_irq_restore(flags);
1012 return;
1013 }
1014
1015 if ((tty->count == 1) && (port->count != 1)) {
1016 /*
1017 * Uh, oh. tty->count is 1, which means that the tty
1018 * structure will be freed. Info->count should always
1019 * be one in these conditions. If it's greater than
1020 * one, we've got real problems, since it means the
1021 * serial port won't be shutdown.
1022 */
1023 printk("rs_close: bad serial port count; tty->count is 1, "
1024 "port->count is %d\n", port->count);
1025 port->count = 1;
1026 }
1027 if (--port->count < 0) {
1028 printk("rs_close: bad serial port count for ttyS%d: %d\n",
1029 info->line, port->count);
1030 port->count = 0;
1031 }
1032 if (port->count) {
1033 local_irq_restore(flags);
1034 return;
1035 }
1036 port->flags |= ASYNC_CLOSING;
1037 /*
1038 * Now we wait for the transmit buffer to clear; and we notify
1039 * the line discipline to only process XON/XOFF characters.
1040 */
1041 tty->closing = 1;
1042 if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1043 tty_wait_until_sent(tty, port->closing_wait);
1044 /*
1045 * At this point we stop accepting input. To do this, we
1046 * disable the receive line status interrupts, and tell the
1047 * interrupt driver to stop checking the data ready bit in the
1048 * line status register.
1049 */
1050
1051 uart->ustcnt &= ~USTCNT_RXEN;
1052 uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
1053
1054 shutdown(info, tty);
1055 rs_flush_buffer(tty);
1056
1057 tty_ldisc_flush(tty);
1058 tty->closing = 0;
1059 tty_port_tty_set(&info->tport, NULL);
1060 #warning "This is not and has never been valid so fix it"
1061 #if 0
1062 if (tty->ldisc.num != ldiscs[N_TTY].num) {
1063 if (tty->ldisc.close)
1064 (tty->ldisc.close)(tty);
1065 tty->ldisc = ldiscs[N_TTY];
1066 tty->termios.c_line = N_TTY;
1067 if (tty->ldisc.open)
1068 (tty->ldisc.open)(tty);
1069 }
1070 #endif
1071 if (port->blocked_open) {
1072 if (port->close_delay)
1073 msleep_interruptible(jiffies_to_msecs(port->close_delay));
1074 wake_up_interruptible(&port->open_wait);
1075 }
1076 port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1077 wake_up_interruptible(&port->close_wait);
1078 local_irq_restore(flags);
1079 }
1080
1081 /*
1082 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1083 */
1084 void rs_hangup(struct tty_struct *tty)
1085 {
1086 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1087
1088 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1089 return;
1090
1091 rs_flush_buffer(tty);
1092 shutdown(info, tty);
1093 info->tport.count = 0;
1094 info->tport.flags &= ~ASYNC_NORMAL_ACTIVE;
1095 tty_port_tty_set(&info->tport, NULL);
1096 wake_up_interruptible(&info->tport.open_wait);
1097 }
1098
1099 /*
1100 * This routine is called whenever a serial port is opened. It
1101 * enables interrupts for a serial port, linking in its S structure into
1102 * the IRQ chain. It also performs the serial-specific
1103 * initialization for the tty structure.
1104 */
1105 int rs_open(struct tty_struct *tty, struct file * filp)
1106 {
1107 struct m68k_serial *info;
1108 int retval;
1109
1110 info = &m68k_soft[tty->index];
1111
1112 if (serial_paranoia_check(info, tty->name, "rs_open"))
1113 return -ENODEV;
1114
1115 info->tport.count++;
1116 tty->driver_data = info;
1117 tty_port_tty_set(&info->tport, tty);
1118
1119 /*
1120 * Start up serial port
1121 */
1122 retval = startup(info, tty);
1123 if (retval)
1124 return retval;
1125
1126 return tty_port_block_til_ready(&info->tport, tty, filp);
1127 }
1128
1129 /* Finally, routines used to initialize the serial driver. */
1130
1131 static void show_serial_version(void)
1132 {
1133 printk("MC68328 serial driver version 1.00\n");
1134 }
1135
1136 static const struct tty_operations rs_ops = {
1137 .open = rs_open,
1138 .close = rs_close,
1139 .write = rs_write,
1140 .flush_chars = rs_flush_chars,
1141 .write_room = rs_write_room,
1142 .chars_in_buffer = rs_chars_in_buffer,
1143 .flush_buffer = rs_flush_buffer,
1144 .ioctl = rs_ioctl,
1145 .throttle = rs_throttle,
1146 .unthrottle = rs_unthrottle,
1147 .set_termios = rs_set_termios,
1148 .stop = rs_stop,
1149 .start = rs_start,
1150 .hangup = rs_hangup,
1151 .set_ldisc = rs_set_ldisc,
1152 };
1153
1154 static const struct tty_port_operations rs_port_ops = {
1155 };
1156
1157 /* rs_init inits the driver */
1158 static int __init
1159 rs68328_init(void)
1160 {
1161 unsigned long flags;
1162 int i;
1163 struct m68k_serial *info;
1164
1165 serial_driver = alloc_tty_driver(NR_PORTS);
1166 if (!serial_driver)
1167 return -ENOMEM;
1168
1169 show_serial_version();
1170
1171 /* Initialize the tty_driver structure */
1172 /* SPARC: Not all of this is exactly right for us. */
1173
1174 serial_driver->name = "ttyS";
1175 serial_driver->major = TTY_MAJOR;
1176 serial_driver->minor_start = 64;
1177 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1178 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1179 serial_driver->init_termios = tty_std_termios;
1180 serial_driver->init_termios.c_cflag =
1181 m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1182 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1183 tty_set_operations(serial_driver, &rs_ops);
1184
1185 local_irq_save(flags);
1186
1187 for(i=0;i<NR_PORTS;i++) {
1188
1189 info = &m68k_soft[i];
1190 tty_port_init(&info->tport);
1191 info->tport.ops = &rs_port_ops;
1192 info->magic = SERIAL_MAGIC;
1193 info->port = (int) &uart_addr[i];
1194 info->irq = uart_irqs[i];
1195 info->custom_divisor = 16;
1196 info->x_char = 0;
1197 info->line = i;
1198 info->is_cons = 1; /* Means shortcuts work */
1199
1200 printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line,
1201 info->port, info->irq);
1202 printk(" is a builtin MC68328 UART\n");
1203
1204 #ifdef CONFIG_M68VZ328
1205 if (i > 0 )
1206 PJSEL &= 0xCF; /* PSW enable second port output */
1207 #endif
1208
1209 if (request_irq(uart_irqs[i],
1210 rs_interrupt,
1211 0,
1212 "M68328_UART", info))
1213 panic("Unable to attach 68328 serial interrupt\n");
1214
1215 tty_port_link_device(&info->tport, serial_driver, i);
1216 }
1217 local_irq_restore(flags);
1218
1219 if (tty_register_driver(serial_driver)) {
1220 put_tty_driver(serial_driver);
1221 for (i = 0; i < NR_PORTS; i++)
1222 tty_port_destroy(&m68k_soft[i].tport);
1223 printk(KERN_ERR "Couldn't register serial driver\n");
1224 return -ENOMEM;
1225 }
1226
1227 return 0;
1228 }
1229
1230 module_init(rs68328_init);
1231
1232
1233
1234 static void m68328_set_baud(void)
1235 {
1236 unsigned short ustcnt;
1237 int i;
1238
1239 ustcnt = USTCNT;
1240 USTCNT = ustcnt & ~USTCNT_TXEN;
1241
1242 again:
1243 for (i = 0; i < ARRAY_SIZE(baud_table); i++)
1244 if (baud_table[i] == m68328_console_baud)
1245 break;
1246 if (i >= ARRAY_SIZE(baud_table)) {
1247 m68328_console_baud = 9600;
1248 goto again;
1249 }
1250
1251 UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
1252 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
1253 ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
1254 ustcnt |= USTCNT_8_7;
1255 ustcnt |= USTCNT_TXEN;
1256 USTCNT = ustcnt;
1257 m68328_console_initted = 1;
1258 return;
1259 }
1260
1261
1262 int m68328_console_setup(struct console *cp, char *arg)
1263 {
1264 int i, n = CONSOLE_BAUD_RATE;
1265
1266 if (!cp)
1267 return(-1);
1268
1269 if (arg)
1270 n = simple_strtoul(arg,NULL,0);
1271
1272 for (i = 0; i < ARRAY_SIZE(baud_table); i++)
1273 if (baud_table[i] == n)
1274 break;
1275 if (i < ARRAY_SIZE(baud_table)) {
1276 m68328_console_baud = n;
1277 m68328_console_cbaud = 0;
1278 if (i > 15) {
1279 m68328_console_cbaud |= CBAUDEX;
1280 i -= 15;
1281 }
1282 m68328_console_cbaud |= i;
1283 }
1284
1285 m68328_set_baud(); /* make sure baud rate changes */
1286 return(0);
1287 }
1288
1289
1290 static struct tty_driver *m68328_console_device(struct console *c, int *index)
1291 {
1292 *index = c->index;
1293 return serial_driver;
1294 }
1295
1296
1297 void m68328_console_write (struct console *co, const char *str,
1298 unsigned int count)
1299 {
1300 if (!m68328_console_initted)
1301 m68328_set_baud();
1302 while (count--) {
1303 if (*str == '\n')
1304 rs_put_char('\r');
1305 rs_put_char( *str++ );
1306 }
1307 }
1308
1309
1310 static struct console m68328_driver = {
1311 .name = "ttyS",
1312 .write = m68328_console_write,
1313 .device = m68328_console_device,
1314 .setup = m68328_console_setup,
1315 .flags = CON_PRINTBUFFER,
1316 .index = -1,
1317 };
1318
1319
1320 static int __init m68328_console_init(void)
1321 {
1322 register_console(&m68328_driver);
1323 return 0;
1324 }
1325
1326 console_initcall(m68328_console_init);
kernel source for telekom puls (alcatel/mediatek)