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Linux v2.6.18-rc4
[linux-2.6/linux-mips.git] / drivers / serial / netx-serial.c
blobc1adc9e4b239cf97e25221830e97fe029ec9282d
1 /*
2 * drivers/serial/netx-serial.c
3 *
4 * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20 #include <linux/config.h>
21
22 #if defined(CONFIG_SERIAL_NETX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
23 #define SUPPORT_SYSRQ
24 #endif
25
26 #include <linux/device.h>
27 #include <linux/module.h>
28 #include <linux/ioport.h>
29 #include <linux/init.h>
30 #include <linux/console.h>
31 #include <linux/sysrq.h>
32 #include <linux/platform_device.h>
33 #include <linux/tty.h>
34 #include <linux/tty_flip.h>
35 #include <linux/serial_core.h>
36 #include <linux/serial.h>
37
38 #include <asm/io.h>
39 #include <asm/irq.h>
40 #include <asm/hardware.h>
41 #include <asm/arch/netx-regs.h>
42
43 /* We've been assigned a range on the "Low-density serial ports" major */
44 #define SERIAL_NX_MAJOR 204
45 #define MINOR_START 170
46
47 #ifdef CONFIG_SERIAL_NETX_CONSOLE
48
49 enum uart_regs {
50 UART_DR = 0x00,
51 UART_SR = 0x04,
52 UART_LINE_CR = 0x08,
53 UART_BAUDDIV_MSB = 0x0c,
54 UART_BAUDDIV_LSB = 0x10,
55 UART_CR = 0x14,
56 UART_FR = 0x18,
57 UART_IIR = 0x1c,
58 UART_ILPR = 0x20,
59 UART_RTS_CR = 0x24,
60 UART_RTS_LEAD = 0x28,
61 UART_RTS_TRAIL = 0x2c,
62 UART_DRV_ENABLE = 0x30,
63 UART_BRM_CR = 0x34,
64 UART_RXFIFO_IRQLEVEL = 0x38,
65 UART_TXFIFO_IRQLEVEL = 0x3c,
66 };
67
68 #define SR_FE (1<<0)
69 #define SR_PE (1<<1)
70 #define SR_BE (1<<2)
71 #define SR_OE (1<<3)
72
73 #define LINE_CR_BRK (1<<0)
74 #define LINE_CR_PEN (1<<1)
75 #define LINE_CR_EPS (1<<2)
76 #define LINE_CR_STP2 (1<<3)
77 #define LINE_CR_FEN (1<<4)
78 #define LINE_CR_5BIT (0<<5)
79 #define LINE_CR_6BIT (1<<5)
80 #define LINE_CR_7BIT (2<<5)
81 #define LINE_CR_8BIT (3<<5)
82 #define LINE_CR_BITS_MASK (3<<5)
83
84 #define CR_UART_EN (1<<0)
85 #define CR_SIREN (1<<1)
86 #define CR_SIRLP (1<<2)
87 #define CR_MSIE (1<<3)
88 #define CR_RIE (1<<4)
89 #define CR_TIE (1<<5)
90 #define CR_RTIE (1<<6)
91 #define CR_LBE (1<<7)
92
93 #define FR_CTS (1<<0)
94 #define FR_DSR (1<<1)
95 #define FR_DCD (1<<2)
96 #define FR_BUSY (1<<3)
97 #define FR_RXFE (1<<4)
98 #define FR_TXFF (1<<5)
99 #define FR_RXFF (1<<6)
100 #define FR_TXFE (1<<7)
101
102 #define IIR_MIS (1<<0)
103 #define IIR_RIS (1<<1)
104 #define IIR_TIS (1<<2)
105 #define IIR_RTIS (1<<3)
106 #define IIR_MASK 0xf
107
108 #define RTS_CR_AUTO (1<<0)
109 #define RTS_CR_RTS (1<<1)
110 #define RTS_CR_COUNT (1<<2)
111 #define RTS_CR_MOD2 (1<<3)
112 #define RTS_CR_RTS_POL (1<<4)
113 #define RTS_CR_CTS_CTR (1<<5)
114 #define RTS_CR_CTS_POL (1<<6)
115 #define RTS_CR_STICK (1<<7)
116
117 #define UART_PORT_SIZE 0x40
118 #define DRIVER_NAME "netx-uart"
119
120 struct netx_port {
121 struct uart_port port;
122 };
123
124 static void netx_stop_tx(struct uart_port *port)
125 {
126 unsigned int val;
127 val = readl(port->membase + UART_CR);
128 writel(val & ~CR_TIE, port->membase + UART_CR);
129 }
130
131 static void netx_stop_rx(struct uart_port *port)
132 {
133 unsigned int val;
134 val = readl(port->membase + UART_CR);
135 writel(val & ~CR_RIE, port->membase + UART_CR);
136 }
137
138 static void netx_enable_ms(struct uart_port *port)
139 {
140 unsigned int val;
141 val = readl(port->membase + UART_CR);
142 writel(val | CR_MSIE, port->membase + UART_CR);
143 }
144
145 static inline void netx_transmit_buffer(struct uart_port *port)
146 {
147 struct circ_buf *xmit = &port->info->xmit;
148
149 if (port->x_char) {
150 writel(port->x_char, port->membase + UART_DR);
151 port->icount.tx++;
152 port->x_char = 0;
153 return;
154 }
155
156 if (uart_tx_stopped(port) || uart_circ_empty(xmit)) {
157 netx_stop_tx(port);
158 return;
159 }
160
161 do {
162 /* send xmit->buf[xmit->tail]
163 * out the port here */
164 writel(xmit->buf[xmit->tail], port->membase + UART_DR);
165 xmit->tail = (xmit->tail + 1) &
166 (UART_XMIT_SIZE - 1);
167 port->icount.tx++;
168 if (uart_circ_empty(xmit))
169 break;
170 } while (!(readl(port->membase + UART_FR) & FR_TXFF));
171
172 if (uart_circ_empty(xmit))
173 netx_stop_tx(port);
174 }
175
176 static void netx_start_tx(struct uart_port *port)
177 {
178 writel(
179 readl(port->membase + UART_CR) | CR_TIE, port->membase + UART_CR);
180
181 if (!(readl(port->membase + UART_FR) & FR_TXFF))
182 netx_transmit_buffer(port);
183 }
184
185 static unsigned int netx_tx_empty(struct uart_port *port)
186 {
187 return readl(port->membase + UART_FR) & FR_BUSY ? 0 : TIOCSER_TEMT;
188 }
189
190 static void netx_txint(struct uart_port *port)
191 {
192 struct circ_buf *xmit = &port->info->xmit;
193
194 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
195 netx_stop_tx(port);
196 return;
197 }
198
199 netx_transmit_buffer(port);
200
201 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
202 uart_write_wakeup(port);
203 }
204
205 static void netx_rxint(struct uart_port *port, struct pt_regs *regs)
206 {
207 unsigned char rx, flg, status;
208 struct tty_struct *tty = port->info->tty;
209
210 while (!(readl(port->membase + UART_FR) & FR_RXFE)) {
211 rx = readl(port->membase + UART_DR);
212 flg = TTY_NORMAL;
213 port->icount.rx++;
214 status = readl(port->membase + UART_SR);
215 if (status & SR_BE) {
216 writel(0, port->membase + UART_SR);
217 if (uart_handle_break(port))
218 continue;
219 }
220
221 if (unlikely(status & (SR_FE | SR_PE | SR_OE))) {
222
223 if (status & SR_PE)
224 port->icount.parity++;
225 else if (status & SR_FE)
226 port->icount.frame++;
227 if (status & SR_OE)
228 port->icount.overrun++;
229
230 status &= port->read_status_mask;
231
232 if (status & SR_BE)
233 flg = TTY_BREAK;
234 else if (status & SR_PE)
235 flg = TTY_PARITY;
236 else if (status & SR_FE)
237 flg = TTY_FRAME;
238 }
239
240 if (uart_handle_sysrq_char(port, rx, regs))
241 continue;
242
243 uart_insert_char(port, status, SR_OE, rx, flg);
244 }
245
246 tty_flip_buffer_push(tty);
247 return;
248 }
249
250 static irqreturn_t netx_int(int irq, void *dev_id, struct pt_regs *regs)
251 {
252 struct uart_port *port = (struct uart_port *)dev_id;
253 unsigned long flags;
254 unsigned char status;
255
256 spin_lock_irqsave(&port->lock,flags);
257
258 status = readl(port->membase + UART_IIR) & IIR_MASK;
259 while (status) {
260 if (status & IIR_RIS)
261 netx_rxint(port, regs);
262 if (status & IIR_TIS)
263 netx_txint(port);
264 if (status & IIR_MIS) {
265 if (readl(port->membase + UART_FR) & FR_CTS)
266 uart_handle_cts_change(port, 1);
267 else
268 uart_handle_cts_change(port, 0);
269 }
270 writel(0, port->membase + UART_IIR);
271 status = readl(port->membase + UART_IIR) & IIR_MASK;
272 }
273
274 spin_unlock_irqrestore(&port->lock,flags);
275 return IRQ_HANDLED;
276 }
277
278 static unsigned int netx_get_mctrl(struct uart_port *port)
279 {
280 unsigned int ret = TIOCM_DSR | TIOCM_CAR;
281
282 if (readl(port->membase + UART_FR) & FR_CTS)
283 ret |= TIOCM_CTS;
284
285 return ret;
286 }
287
288 static void netx_set_mctrl(struct uart_port *port, unsigned int mctrl)
289 {
290 unsigned int val;
291
292 if (mctrl & TIOCM_RTS) {
293 val = readl(port->membase + UART_RTS_CR);
294 writel(val | RTS_CR_RTS, port->membase + UART_RTS_CR);
295 }
296 }
297
298 static void netx_break_ctl(struct uart_port *port, int break_state)
299 {
300 unsigned int line_cr;
301 spin_lock_irq(&port->lock);
302
303 line_cr = readl(port->membase + UART_LINE_CR);
304 if (break_state != 0)
305 line_cr |= LINE_CR_BRK;
306 else
307 line_cr &= ~LINE_CR_BRK;
308 writel(line_cr, port->membase + UART_LINE_CR);
309
310 spin_unlock_irq(&port->lock);
311 }
312
313 static int netx_startup(struct uart_port *port)
314 {
315 int ret;
316
317 ret = request_irq(port->irq, netx_int, 0,
318 DRIVER_NAME, port);
319 if (ret) {
320 dev_err(port->dev, "unable to grab irq%d\n",port->irq);
321 goto exit;
322 }
323
324 writel(readl(port->membase + UART_LINE_CR) | LINE_CR_FEN,
325 port->membase + UART_LINE_CR);
326
327 writel(CR_MSIE | CR_RIE | CR_TIE | CR_RTIE | CR_UART_EN,
328 port->membase + UART_CR);
329
330 exit:
331 return ret;
332 }
333
334 static void netx_shutdown(struct uart_port *port)
335 {
336 writel(0, port->membase + UART_CR) ;
337
338 free_irq(port->irq, port);
339 }
340
341 static void
342 netx_set_termios(struct uart_port *port, struct termios *termios,
343 struct termios *old)
344 {
345 unsigned int baud, quot;
346 unsigned char old_cr;
347 unsigned char line_cr = LINE_CR_FEN;
348 unsigned char rts_cr = 0;
349
350 switch (termios->c_cflag & CSIZE) {
351 case CS5:
352 line_cr |= LINE_CR_5BIT;
353 break;
354 case CS6:
355 line_cr |= LINE_CR_6BIT;
356 break;
357 case CS7:
358 line_cr |= LINE_CR_7BIT;
359 break;
360 case CS8:
361 line_cr |= LINE_CR_8BIT;
362 break;
363 }
364
365 if (termios->c_cflag & CSTOPB)
366 line_cr |= LINE_CR_STP2;
367
368 if (termios->c_cflag & PARENB) {
369 line_cr |= LINE_CR_PEN;
370 if (!(termios->c_cflag & PARODD))
371 line_cr |= LINE_CR_EPS;
372 }
373
374 if (termios->c_cflag & CRTSCTS)
375 rts_cr = RTS_CR_AUTO | RTS_CR_CTS_CTR | RTS_CR_RTS_POL;
376
377 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
378 quot = baud * 4096;
379 quot /= 1000;
380 quot *= 256;
381 quot /= 100000;
382
383 spin_lock_irq(&port->lock);
384
385 uart_update_timeout(port, termios->c_cflag, baud);
386
387 old_cr = readl(port->membase + UART_CR);
388
389 /* disable interrupts */
390 writel(old_cr & ~(CR_MSIE | CR_RIE | CR_TIE | CR_RTIE),
391 port->membase + UART_CR);
392
393 /* drain transmitter */
394 while (readl(port->membase + UART_FR) & FR_BUSY);
395
396 /* disable UART */
397 writel(old_cr & ~CR_UART_EN, port->membase + UART_CR);
398
399 /* modem status interrupts */
400 old_cr &= ~CR_MSIE;
401 if (UART_ENABLE_MS(port, termios->c_cflag))
402 old_cr |= CR_MSIE;
403
404 writel((quot>>8) & 0xff, port->membase + UART_BAUDDIV_MSB);
405 writel(quot & 0xff, port->membase + UART_BAUDDIV_LSB);
406 writel(line_cr, port->membase + UART_LINE_CR);
407
408 writel(rts_cr, port->membase + UART_RTS_CR);
409
410 /*
411 * Characters to ignore
412 */
413 port->ignore_status_mask = 0;
414 if (termios->c_iflag & IGNPAR)
415 port->ignore_status_mask |= SR_PE;
416 if (termios->c_iflag & IGNBRK) {
417 port->ignore_status_mask |= SR_BE;
418 /*
419 * If we're ignoring parity and break indicators,
420 * ignore overruns too (for real raw support).
421 */
422 if (termios->c_iflag & IGNPAR)
423 port->ignore_status_mask |= SR_PE;
424 }
425
426 port->read_status_mask = 0;
427 if (termios->c_iflag & (BRKINT | PARMRK))
428 port->read_status_mask |= SR_BE;
429 if (termios->c_iflag & INPCK)
430 port->read_status_mask |= SR_PE | SR_FE;
431
432 writel(old_cr, port->membase + UART_CR);
433
434 spin_unlock_irq(&port->lock);
435 }
436
437 static const char *netx_type(struct uart_port *port)
438 {
439 return port->type == PORT_NETX ? "NETX" : NULL;
440 }
441
442 static void netx_release_port(struct uart_port *port)
443 {
444 release_mem_region(port->mapbase, UART_PORT_SIZE);
445 }
446
447 static int netx_request_port(struct uart_port *port)
448 {
449 return request_mem_region(port->mapbase, UART_PORT_SIZE,
450 DRIVER_NAME) != NULL ? 0 : -EBUSY;
451 }
452
453 static void netx_config_port(struct uart_port *port, int flags)
454 {
455 if (flags & UART_CONFIG_TYPE && netx_request_port(port) == 0)
456 port->type = PORT_NETX;
457 }
458
459 static int
460 netx_verify_port(struct uart_port *port, struct serial_struct *ser)
461 {
462 int ret = 0;
463
464 if (ser->type != PORT_UNKNOWN && ser->type != PORT_NETX)
465 ret = -EINVAL;
466
467 return ret;
468 }
469
470 static struct uart_ops netx_pops = {
471 .tx_empty = netx_tx_empty,
472 .set_mctrl = netx_set_mctrl,
473 .get_mctrl = netx_get_mctrl,
474 .stop_tx = netx_stop_tx,
475 .start_tx = netx_start_tx,
476 .stop_rx = netx_stop_rx,
477 .enable_ms = netx_enable_ms,
478 .break_ctl = netx_break_ctl,
479 .startup = netx_startup,
480 .shutdown = netx_shutdown,
481 .set_termios = netx_set_termios,
482 .type = netx_type,
483 .release_port = netx_release_port,
484 .request_port = netx_request_port,
485 .config_port = netx_config_port,
486 .verify_port = netx_verify_port,
487 };
488
489 static struct netx_port netx_ports[] = {
490 {
491 .port = {
492 .type = PORT_NETX,
493 .iotype = UPIO_MEM,
494 .membase = (char __iomem *)io_p2v(NETX_PA_UART0),
495 .mapbase = NETX_PA_UART0,
496 .irq = NETX_IRQ_UART0,
497 .uartclk = 100000000,
498 .fifosize = 16,
499 .flags = UPF_BOOT_AUTOCONF,
500 .ops = &netx_pops,
501 .line = 0,
502 },
503 }, {
504 .port = {
505 .type = PORT_NETX,
506 .iotype = UPIO_MEM,
507 .membase = (char __iomem *)io_p2v(NETX_PA_UART1),
508 .mapbase = NETX_PA_UART1,
509 .irq = NETX_IRQ_UART1,
510 .uartclk = 100000000,
511 .fifosize = 16,
512 .flags = UPF_BOOT_AUTOCONF,
513 .ops = &netx_pops,
514 .line = 1,
515 },
516 }, {
517 .port = {
518 .type = PORT_NETX,
519 .iotype = UPIO_MEM,
520 .membase = (char __iomem *)io_p2v(NETX_PA_UART2),
521 .mapbase = NETX_PA_UART2,
522 .irq = NETX_IRQ_UART2,
523 .uartclk = 100000000,
524 .fifosize = 16,
525 .flags = UPF_BOOT_AUTOCONF,
526 .ops = &netx_pops,
527 .line = 2,
528 },
529 }
530 };
531
532 static void netx_console_putchar(struct uart_port *port, int ch)
533 {
534 while (readl(port->membase + UART_FR) & FR_BUSY);
535 writel(ch, port->membase + UART_DR);
536 }
537
538 static void
539 netx_console_write(struct console *co, const char *s, unsigned int count)
540 {
541 struct uart_port *port = &netx_ports[co->index].port;
542 unsigned char cr_save;
543
544 cr_save = readl(port->membase + UART_CR);
545 writel(cr_save | CR_UART_EN, port->membase + UART_CR);
546
547 uart_console_write(port, s, count, netx_console_putchar);
548
549 while (readl(port->membase + UART_FR) & FR_BUSY);
550 writel(cr_save, port->membase + UART_CR);
551 }
552
553 static void __init
554 netx_console_get_options(struct uart_port *port, int *baud,
555 int *parity, int *bits, int *flow)
556 {
557 unsigned char line_cr;
558
559 *baud = (readl(port->membase + UART_BAUDDIV_MSB) << 8) |
560 readl(port->membase + UART_BAUDDIV_LSB);
561 *baud *= 1000;
562 *baud /= 4096;
563 *baud *= 1000;
564 *baud /= 256;
565 *baud *= 100;
566
567 line_cr = readl(port->membase + UART_LINE_CR);
568 *parity = 'n';
569 if (line_cr & LINE_CR_PEN) {
570 if (line_cr & LINE_CR_EPS)
571 *parity = 'e';
572 else
573 *parity = 'o';
574 }
575
576 switch (line_cr & LINE_CR_BITS_MASK) {
577 case LINE_CR_8BIT:
578 *bits = 8;
579 break;
580 case LINE_CR_7BIT:
581 *bits = 7;
582 break;
583 case LINE_CR_6BIT:
584 *bits = 6;
585 break;
586 case LINE_CR_5BIT:
587 *bits = 5;
588 break;
589 }
590
591 if (readl(port->membase + UART_RTS_CR) & RTS_CR_AUTO)
592 *flow = 'r';
593 }
594
595 static int __init
596 netx_console_setup(struct console *co, char *options)
597 {
598 struct netx_port *sport;
599 int baud = 9600;
600 int bits = 8;
601 int parity = 'n';
602 int flow = 'n';
603
604 /*
605 * Check whether an invalid uart number has been specified, and
606 * if so, search for the first available port that does have
607 * console support.
608 */
609 if (co->index == -1 || co->index >= ARRAY_SIZE(netx_ports))
610 co->index = 0;
611 sport = &netx_ports[co->index];
612
613 if (options) {
614 uart_parse_options(options, &baud, &parity, &bits, &flow);
615 } else {
616 /* if the UART is enabled, assume it has been correctly setup
617 * by the bootloader and get the options
618 */
619 if (readl(sport->port.membase + UART_CR) & CR_UART_EN) {
620 netx_console_get_options(&sport->port, &baud,
621 &parity, &bits, &flow);
622 }
623
624 }
625
626 return uart_set_options(&sport->port, co, baud, parity, bits, flow);
627 }
628
629 static struct uart_driver netx_reg;
630 static struct console netx_console = {
631 .name = "ttyNX",
632 .write = netx_console_write,
633 .device = uart_console_device,
634 .setup = netx_console_setup,
635 .flags = CON_PRINTBUFFER,
636 .index = -1,
637 .data = &netx_reg,
638 };
639
640 static int __init netx_console_init(void)
641 {
642 register_console(&netx_console);
643 return 0;
644 }
645 console_initcall(netx_console_init);
646
647 #define NETX_CONSOLE &netx_console
648 #else
649 #define NETX_CONSOLE NULL
650 #endif
651
652 static struct uart_driver netx_reg = {
653 .owner = THIS_MODULE,
654 .driver_name = DRIVER_NAME,
655 .dev_name = "ttyNX",
656 .major = SERIAL_NX_MAJOR,
657 .minor = MINOR_START,
658 .nr = ARRAY_SIZE(netx_ports),
659 .cons = NETX_CONSOLE,
660 };
661
662 static int serial_netx_suspend(struct platform_device *pdev, pm_message_t state)
663 {
664 struct netx_port *sport = platform_get_drvdata(pdev);
665
666 if (sport)
667 uart_suspend_port(&netx_reg, &sport->port);
668
669 return 0;
670 }
671
672 static int serial_netx_resume(struct platform_device *pdev)
673 {
674 struct netx_port *sport = platform_get_drvdata(pdev);
675
676 if (sport)
677 uart_resume_port(&netx_reg, &sport->port);
678
679 return 0;
680 }
681
682 static int serial_netx_probe(struct platform_device *pdev)
683 {
684 struct uart_port *port = &netx_ports[pdev->id].port;
685
686 dev_info(&pdev->dev, "initialising\n");
687
688 port->dev = &pdev->dev;
689
690 writel(1, port->membase + UART_RXFIFO_IRQLEVEL);
691 uart_add_one_port(&netx_reg, &netx_ports[pdev->id].port);
692 platform_set_drvdata(pdev, &netx_ports[pdev->id]);
693
694 return 0;
695 }
696
697 static int serial_netx_remove(struct platform_device *pdev)
698 {
699 struct netx_port *sport = platform_get_drvdata(pdev);
700
701 platform_set_drvdata(pdev, NULL);
702
703 if (sport)
704 uart_remove_one_port(&netx_reg, &sport->port);
705
706 return 0;
707 }
708
709 static struct platform_driver serial_netx_driver = {
710 .probe = serial_netx_probe,
711 .remove = serial_netx_remove,
712
713 .suspend = serial_netx_suspend,
714 .resume = serial_netx_resume,
715
716 .driver = {
717 .name = DRIVER_NAME,
718 },
719 };
720
721 static int __init netx_serial_init(void)
722 {
723 int ret;
724
725 printk(KERN_INFO "Serial: NetX driver\n");
726
727 ret = uart_register_driver(&netx_reg);
728 if (ret)
729 return ret;
730
731 ret = platform_driver_register(&serial_netx_driver);
732 if (ret != 0)
733 uart_unregister_driver(&netx_reg);
734
735 return 0;
736 }
737
738 static void __exit netx_serial_exit(void)
739 {
740 platform_driver_unregister(&serial_netx_driver);
741 uart_unregister_driver(&netx_reg);
742 }
743
744 module_init(netx_serial_init);
745 module_exit(netx_serial_exit);
746
747 MODULE_AUTHOR("Sascha Hauer");
748 MODULE_DESCRIPTION("NetX serial port driver");
749 MODULE_LICENSE("GPL");
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