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[openwrt/svn-archive/archive.git] / target / linux / ifxmips / files-2.6.32 / drivers / serial / ifxmips.c
1 /*
2 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 * Copyright (C) 2004 Infineon IFAP DC COM CPE
19 * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
20 * Copyright (C) 2007 John Crispin <blogic@openwrt.org>
21 */
22
23 #include <linux/module.h>
24 #include <linux/errno.h>
25 #include <linux/signal.h>
26 #include <linux/sched.h>
27 #include <linux/interrupt.h>
28 #include <linux/tty.h>
29 #include <linux/tty_flip.h>
30 #include <linux/major.h>
31 #include <linux/string.h>
32 #include <linux/fcntl.h>
33 #include <linux/ptrace.h>
34 #include <linux/ioport.h>
35 #include <linux/mm.h>
36 #include <linux/slab.h>
37 #include <linux/init.h>
38 #include <linux/circ_buf.h>
39 #include <linux/serial.h>
40 #include <linux/serial_core.h>
41 #include <linux/console.h>
42 #include <linux/sysrq.h>
43 #include <linux/irq.h>
44 #include <linux/platform_device.h>
45 #include <linux/io.h>
46 #include <linux/uaccess.h>
47 #include <linux/bitops.h>
48
49 #include <asm/system.h>
50
51 #include <ifxmips.h>
52 #include <ifxmips_irq.h>
53
54 #define PORT_IFXMIPSASC 111
55
56 #include <linux/serial_core.h>
57
58 #define UART_DUMMY_UER_RX 1
59
60 static void ifxmipsasc_tx_chars(struct uart_port *port);
61 extern void prom_printf(const char *fmt, ...);
62 static struct uart_port ifxmipsasc_port[2];
63 static struct uart_driver ifxmipsasc_reg;
64 extern unsigned int ifxmips_get_fpi_hz(void);
65
66 static void ifxmipsasc_stop_tx(struct uart_port *port)
67 {
68 return;
69 }
70
71 static void ifxmipsasc_start_tx(struct uart_port *port)
72 {
73 unsigned long flags;
74 local_irq_save(flags);
75 ifxmipsasc_tx_chars(port);
76 local_irq_restore(flags);
77 return;
78 }
79
80 static void ifxmipsasc_stop_rx(struct uart_port *port)
81 {
82 ifxmips_w32(ASCWHBSTATE_CLRREN, port->membase + IFXMIPS_ASC_WHBSTATE);
83 }
84
85 static void ifxmipsasc_enable_ms(struct uart_port *port)
86 {
87 }
88
89 #include <linux/version.h>
90
91 static void ifxmipsasc_rx_chars(struct uart_port *port)
92 {
93 struct tty_struct *tty = port->state->port.tty;
94 unsigned int ch = 0, rsr = 0, fifocnt;
95
96 fifocnt = ifxmips_r32(port->membase + IFXMIPS_ASC_FSTAT) & ASCFSTAT_RXFFLMASK;
97 while (fifocnt--) {
98 u8 flag = TTY_NORMAL;
99 ch = ifxmips_r32(port->membase + IFXMIPS_ASC_RBUF);
100 rsr = (ifxmips_r32(port->membase + IFXMIPS_ASC_STATE) & ASCSTATE_ANY) | UART_DUMMY_UER_RX;
101 tty_flip_buffer_push(tty);
102 port->icount.rx++;
103
104 /*
105 * Note that the error handling code is
106 * out of the main execution path
107 */
108 if (rsr & ASCSTATE_ANY) {
109 if (rsr & ASCSTATE_PE) {
110 port->icount.parity++;
111 ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_WHBSTATE) | ASCWHBSTATE_CLRPE, port->membase + IFXMIPS_ASC_WHBSTATE);
112 } else if (rsr & ASCSTATE_FE) {
113 port->icount.frame++;
114 ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_WHBSTATE) | ASCWHBSTATE_CLRFE, port->membase + IFXMIPS_ASC_WHBSTATE);
115 }
116 if (rsr & ASCSTATE_ROE) {
117 port->icount.overrun++;
118 ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_WHBSTATE) | ASCWHBSTATE_CLRROE, port->membase + IFXMIPS_ASC_WHBSTATE);
119 }
120
121 rsr &= port->read_status_mask;
122
123 if (rsr & ASCSTATE_PE)
124 flag = TTY_PARITY;
125 else if (rsr & ASCSTATE_FE)
126 flag = TTY_FRAME;
127 }
128
129 if ((rsr & port->ignore_status_mask) == 0)
130 tty_insert_flip_char(tty, ch, flag);
131
132 if (rsr & ASCSTATE_ROE)
133 /*
134 * Overrun is special, since it's reported
135 * immediately, and doesn't affect the current
136 * character
137 */
138 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
139 }
140 if (ch != 0)
141 tty_flip_buffer_push(tty);
142 return;
143 }
144
145
146 static void ifxmipsasc_tx_chars(struct uart_port *port)
147 {
148 struct circ_buf *xmit = &port->state->xmit;
149 if (uart_tx_stopped(port)) {
150 ifxmipsasc_stop_tx(port);
151 return;
152 }
153
154 while (((ifxmips_r32(port->membase + IFXMIPS_ASC_FSTAT) & ASCFSTAT_TXFFLMASK)
155 >> ASCFSTAT_TXFFLOFF) != TXFIFO_FULL) {
156 if (port->x_char) {
157 ifxmips_w32(port->x_char, port->membase + IFXMIPS_ASC_TBUF);
158 port->icount.tx++;
159 port->x_char = 0;
160 continue;
161 }
162
163 if (uart_circ_empty(xmit))
164 break;
165
166 ifxmips_w32(port->state->xmit.buf[port->state->xmit.tail], port->membase + IFXMIPS_ASC_TBUF);
167 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
168 port->icount.tx++;
169 }
170
171 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
172 uart_write_wakeup(port);
173 }
174
175 static irqreturn_t ifxmipsasc_tx_int(int irq, void *_port)
176 {
177 struct uart_port *port = (struct uart_port *)_port;
178 ifxmips_w32(ASC_IRNCR_TIR, port->membase + IFXMIPS_ASC_IRNCR);
179 ifxmipsasc_start_tx(port);
180 ifxmips_mask_and_ack_irq(irq);
181 return IRQ_HANDLED;
182 }
183
184 static irqreturn_t ifxmipsasc_er_int(int irq, void *_port)
185 {
186 struct uart_port *port = (struct uart_port *)_port;
187 /* clear any pending interrupts */
188 ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_WHBSTATE) | ASCWHBSTATE_CLRPE |
189 ASCWHBSTATE_CLRFE | ASCWHBSTATE_CLRROE, port->membase + IFXMIPS_ASC_WHBSTATE);
190 return IRQ_HANDLED;
191 }
192
193 static irqreturn_t ifxmipsasc_rx_int(int irq, void *_port)
194 {
195 struct uart_port *port = (struct uart_port *)_port;
196 ifxmips_w32(ASC_IRNCR_RIR, port->membase + IFXMIPS_ASC_IRNCR);
197 ifxmipsasc_rx_chars((struct uart_port *)port);
198 ifxmips_mask_and_ack_irq(irq);
199 return IRQ_HANDLED;
200 }
201
202 static unsigned int ifxmipsasc_tx_empty(struct uart_port *port)
203 {
204 int status;
205 status = ifxmips_r32(port->membase + IFXMIPS_ASC_FSTAT) & ASCFSTAT_TXFFLMASK;
206 return status ? 0 : TIOCSER_TEMT;
207 }
208
209 static unsigned int ifxmipsasc_get_mctrl(struct uart_port *port)
210 {
211 return TIOCM_CTS | TIOCM_CAR | TIOCM_DSR;
212 }
213
214 static void ifxmipsasc_set_mctrl(struct uart_port *port, u_int mctrl)
215 {
216 }
217
218 static void ifxmipsasc_break_ctl(struct uart_port *port, int break_state)
219 {
220 }
221
222 static int ifxmipsasc_startup(struct uart_port *port)
223 {
224 int retval;
225
226 port->uartclk = ifxmips_get_fpi_hz();
227
228 ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CLC) & ~IFXMIPS_ASC_CLC_DISS, port->membase + IFXMIPS_ASC_CLC);
229 ifxmips_w32(((ifxmips_r32(port->membase + IFXMIPS_ASC_CLC) & ~ASCCLC_RMCMASK)) | (1 << ASCCLC_RMCOFFSET), port->membase + IFXMIPS_ASC_CLC);
230 ifxmips_w32(0, port->membase + IFXMIPS_ASC_PISEL);
231 ifxmips_w32(((TXFIFO_FL << ASCTXFCON_TXFITLOFF) & ASCTXFCON_TXFITLMASK) | ASCTXFCON_TXFEN | ASCTXFCON_TXFFLU, port->membase + IFXMIPS_ASC_TXFCON);
232 ifxmips_w32(((RXFIFO_FL << ASCRXFCON_RXFITLOFF) & ASCRXFCON_RXFITLMASK) | ASCRXFCON_RXFEN | ASCRXFCON_RXFFLU, port->membase + IFXMIPS_ASC_RXFCON);
233 wmb();
234 ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CON) | ASCCON_M_8ASYNC | ASCCON_FEN | ASCCON_TOEN | ASCCON_ROEN, port->membase + IFXMIPS_ASC_CON);
235
236 retval = request_irq(port->irq, ifxmipsasc_tx_int, IRQF_DISABLED, "asc_tx", port);
237 if (retval) {
238 printk(KERN_ERR "failed to request ifxmipsasc_tx_int\n");
239 return retval;
240 }
241
242 retval = request_irq(port->irq + 2, ifxmipsasc_rx_int, IRQF_DISABLED, "asc_rx", port);
243 if (retval) {
244 printk(KERN_ERR "failed to request ifxmipsasc_rx_int\n");
245 goto err1;
246 }
247
248 retval = request_irq(port->irq + 3, ifxmipsasc_er_int, IRQF_DISABLED, "asc_er", port);
249 if (retval) {
250 printk(KERN_ERR "failed to request ifxmipsasc_er_int\n");
251 goto err2;
252 }
253
254 ifxmips_w32(ASC_IRNREN_RX_BUF | ASC_IRNREN_TX_BUF | ASC_IRNREN_ERR | ASC_IRNREN_TX, port->membase + IFXMIPS_ASC_IRNREN);
255 return 0;
256
257 err2:
258 free_irq(port->irq + 2, port);
259 err1:
260 free_irq(port->irq, port);
261 return retval;
262 }
263
264 static void ifxmipsasc_shutdown(struct uart_port *port)
265 {
266 free_irq(port->irq, port);
267 free_irq(port->irq + 2, port);
268 free_irq(port->irq + 3, port);
269
270 ifxmips_w32(0, port->membase + IFXMIPS_ASC_CON);
271 ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_RXFCON) | ASCRXFCON_RXFFLU, port->membase + IFXMIPS_ASC_RXFCON);
272 ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_RXFCON) & ~ASCRXFCON_RXFEN, port->membase + IFXMIPS_ASC_RXFCON);
273 ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_TXFCON) | ASCTXFCON_TXFFLU, port->membase + IFXMIPS_ASC_TXFCON);
274 ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_TXFCON) & ~ASCTXFCON_TXFEN, port->membase + IFXMIPS_ASC_TXFCON);
275 }
276
277 static void ifxmipsasc_set_termios(struct uart_port *port, struct ktermios *new, struct ktermios *old)
278 {
279 unsigned int cflag;
280 unsigned int iflag;
281 unsigned int quot;
282 unsigned int baud;
283 unsigned int con = 0;
284 unsigned long flags;
285
286 cflag = new->c_cflag;
287 iflag = new->c_iflag;
288
289 switch (cflag & CSIZE) {
290 case CS7:
291 con = ASCCON_M_7ASYNC;
292 break;
293
294 case CS5:
295 case CS6:
296 default:
297 con = ASCCON_M_8ASYNC;
298 break;
299 }
300
301 if (cflag & CSTOPB)
302 con |= ASCCON_STP;
303
304 if (cflag & PARENB) {
305 if (!(cflag & PARODD))
306 con &= ~ASCCON_ODD;
307 else
308 con |= ASCCON_ODD;
309 }
310
311 port->read_status_mask = ASCSTATE_ROE;
312 if (iflag & INPCK)
313 port->read_status_mask |= ASCSTATE_FE | ASCSTATE_PE;
314
315 port->ignore_status_mask = 0;
316 if (iflag & IGNPAR)
317 port->ignore_status_mask |= ASCSTATE_FE | ASCSTATE_PE;
318
319 if (iflag & IGNBRK) {
320 /*
321 * If we're ignoring parity and break indicators,
322 * ignore overruns too (for real raw support).
323 */
324 if (iflag & IGNPAR)
325 port->ignore_status_mask |= ASCSTATE_ROE;
326 }
327
328 if ((cflag & CREAD) == 0)
329 port->ignore_status_mask |= UART_DUMMY_UER_RX;
330
331 /* set error signals - framing, parity and overrun, enable receiver */
332 con |= ASCCON_FEN | ASCCON_TOEN | ASCCON_ROEN;
333
334 local_irq_save(flags);
335
336 /* set up CON */
337 ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CON) | con, port->membase + IFXMIPS_ASC_CON);
338
339 /* Set baud rate - take a divider of 2 into account */
340 baud = uart_get_baud_rate(port, new, old, 0, port->uartclk / 16);
341 quot = uart_get_divisor(port, baud);
342 quot = quot / 2 - 1;
343
344 /* disable the baudrate generator */
345 ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CON) & ~ASCCON_R, port->membase + IFXMIPS_ASC_CON);
346
347 /* make sure the fractional divider is off */
348 ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CON) & ~ASCCON_FDE, port->membase + IFXMIPS_ASC_CON);
349
350 /* set up to use divisor of 2 */
351 ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CON) & ~ASCCON_BRS, port->membase + IFXMIPS_ASC_CON);
352
353 /* now we can write the new baudrate into the register */
354 ifxmips_w32(quot, port->membase + IFXMIPS_ASC_BG);
355
356 /* turn the baudrate generator back on */
357 ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CON) | ASCCON_R, port->membase + IFXMIPS_ASC_CON);
358
359 /* enable rx */
360 ifxmips_w32(ASCWHBSTATE_SETREN, port->membase + IFXMIPS_ASC_WHBSTATE);
361
362 local_irq_restore(flags);
363 }
364
365 static const char *ifxmipsasc_type(struct uart_port *port)
366 {
367 if (port->type == PORT_IFXMIPSASC) {
368 if (port->membase == (void *)IFXMIPS_ASC_BASE_ADDR)
369 return "asc0";
370 else
371 return "asc1";
372 } else {
373 return NULL;
374 }
375 }
376
377 static void ifxmipsasc_release_port(struct uart_port *port)
378 {
379 }
380
381 static int ifxmipsasc_request_port(struct uart_port *port)
382 {
383 return 0;
384 }
385
386 static void ifxmipsasc_config_port(struct uart_port *port, int flags)
387 {
388 if (flags & UART_CONFIG_TYPE) {
389 port->type = PORT_IFXMIPSASC;
390 ifxmipsasc_request_port(port);
391 }
392 }
393
394 static int ifxmipsasc_verify_port(struct uart_port *port, struct serial_struct *ser)
395 {
396 int ret = 0;
397 if (ser->type != PORT_UNKNOWN && ser->type != PORT_IFXMIPSASC)
398 ret = -EINVAL;
399 if (ser->irq < 0 || ser->irq >= NR_IRQS)
400 ret = -EINVAL;
401 if (ser->baud_base < 9600)
402 ret = -EINVAL;
403 return ret;
404 }
405
406 static struct uart_ops ifxmipsasc_pops = {
407 .tx_empty = ifxmipsasc_tx_empty,
408 .set_mctrl = ifxmipsasc_set_mctrl,
409 .get_mctrl = ifxmipsasc_get_mctrl,
410 .stop_tx = ifxmipsasc_stop_tx,
411 .start_tx = ifxmipsasc_start_tx,
412 .stop_rx = ifxmipsasc_stop_rx,
413 .enable_ms = ifxmipsasc_enable_ms,
414 .break_ctl = ifxmipsasc_break_ctl,
415 .startup = ifxmipsasc_startup,
416 .shutdown = ifxmipsasc_shutdown,
417 .set_termios = ifxmipsasc_set_termios,
418 .type = ifxmipsasc_type,
419 .release_port = ifxmipsasc_release_port,
420 .request_port = ifxmipsasc_request_port,
421 .config_port = ifxmipsasc_config_port,
422 .verify_port = ifxmipsasc_verify_port,
423 };
424
425 static struct uart_port ifxmipsasc_port[2] = {
426 {
427 .membase = (void *)IFXMIPS_ASC_BASE_ADDR,
428 .mapbase = IFXMIPS_ASC_BASE_ADDR,
429 .iotype = SERIAL_IO_MEM,
430 .irq = IFXMIPSASC_TIR(0),
431 .uartclk = 0,
432 .fifosize = 16,
433 .type = PORT_IFXMIPSASC,
434 .ops = &ifxmipsasc_pops,
435 .flags = ASYNC_BOOT_AUTOCONF,
436 .line = 0
437 }, {
438 .membase = (void *)(IFXMIPS_ASC_BASE_ADDR + IFXMIPS_ASC_BASE_DIFF),
439 .mapbase = IFXMIPS_ASC_BASE_ADDR + IFXMIPS_ASC_BASE_DIFF,
440 .iotype = SERIAL_IO_MEM,
441 .irq = IFXMIPSASC_TIR(1),
442 .uartclk = 0,
443 .fifosize = 16,
444 .type = PORT_IFXMIPSASC,
445 .ops = &ifxmipsasc_pops,
446 .flags = ASYNC_BOOT_AUTOCONF,
447 .line = 1
448 }
449 };
450
451 static void ifxmipsasc_console_write(struct console *co, const char *s, u_int count)
452 {
453 int port = co->index;
454 int i, fifocnt;
455 unsigned long flags;
456 local_irq_save(flags);
457 for (i = 0; i < count; i++) {
458 do {
459 fifocnt = (ifxmips_r32((u32 *)(IFXMIPS_ASC_BASE_ADDR + (port * IFXMIPS_ASC_BASE_DIFF) + IFXMIPS_ASC_FSTAT)) & ASCFSTAT_TXFFLMASK)
460 >> ASCFSTAT_TXFFLOFF;
461 } while (fifocnt == TXFIFO_FULL);
462
463 if (s[i] == '\0')
464 break;
465
466 if (s[i] == '\n') {
467 ifxmips_w32('\r', (u32 *)(IFXMIPS_ASC_BASE_ADDR + (port * IFXMIPS_ASC_BASE_DIFF) + IFXMIPS_ASC_TBUF));
468 do {
469 fifocnt = (ifxmips_r32((u32 *)(IFXMIPS_ASC_BASE_ADDR + (port * IFXMIPS_ASC_BASE_DIFF) + IFXMIPS_ASC_FSTAT)) & ASCFSTAT_TXFFLMASK)
470 >> ASCFSTAT_TXFFLOFF;
471 } while (fifocnt == TXFIFO_FULL);
472 }
473 ifxmips_w32(s[i], (u32 *)(IFXMIPS_ASC_BASE_ADDR + (port * IFXMIPS_ASC_BASE_DIFF) + IFXMIPS_ASC_TBUF));
474 }
475
476 local_irq_restore(flags);
477 }
478
479 static int __init ifxmipsasc_console_setup(struct console *co, char *options)
480 {
481 int port = co->index;
482 int baud = 115200;
483 int bits = 8;
484 int parity = 'n';
485 int flow = 'n';
486 ifxmipsasc_port[port].uartclk = ifxmips_get_fpi_hz();
487 ifxmipsasc_port[port].type = PORT_IFXMIPSASC;
488 if (options)
489 uart_parse_options(options, &baud, &parity, &bits, &flow);
490 return uart_set_options(&ifxmipsasc_port[port], co, baud, parity, bits, flow);
491 }
492
493 static struct console ifxmipsasc_console[2] =
494 {
495 {
496 .name = "ttyS",
497 .write = ifxmipsasc_console_write,
498 .device = uart_console_device,
499 .setup = ifxmipsasc_console_setup,
500 .flags = CON_PRINTBUFFER,
501 .index = 0,
502 .data = &ifxmipsasc_reg,
503 }, {
504 .name = "ttyS",
505 .write = ifxmipsasc_console_write,
506 .device = uart_console_device,
507 .setup = ifxmipsasc_console_setup,
508 .flags = CON_PRINTBUFFER,
509 .index = 1,
510 .data = &ifxmipsasc_reg,
511 }
512 };
513
514 static int __init ifxmipsasc_console_init(void)
515 {
516 register_console(&ifxmipsasc_console[0]);
517 register_console(&ifxmipsasc_console[1]);
518 return 0;
519 }
520 console_initcall(ifxmipsasc_console_init);
521
522 static struct uart_driver ifxmipsasc_reg = {
523 .owner = THIS_MODULE,
524 .driver_name = "serial",
525 .dev_name = "ttyS",
526 .major = TTY_MAJOR,
527 .minor = 64,
528 .nr = 2,
529 .cons = &ifxmipsasc_console[1],
530 };
531
532 int __init ifxmipsasc_init(void)
533 {
534 int ret;
535 uart_register_driver(&ifxmipsasc_reg);
536 ret = uart_add_one_port(&ifxmipsasc_reg, &ifxmipsasc_port[0]);
537 ret = uart_add_one_port(&ifxmipsasc_reg, &ifxmipsasc_port[1]);
538 return 0;
539 }
540
541 void __exit ifxmipsasc_exit(void)
542 {
543 uart_unregister_driver(&ifxmipsasc_reg);
544 }
545
546 module_init(ifxmipsasc_init);
547 module_exit(ifxmipsasc_exit);
548
549 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
550 MODULE_DESCRIPTION("MIPS IFXMips serial port driver");
551 MODULE_LICENSE("GPL");
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