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serial: samsung: Fix unintended usage of uart port 0 as console
[linux-2.6-block.git] / drivers / tty / serial / samsung.c
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99edb3d1 1/*
b497549a
BD		 2 * Driver core for Samsung SoC onboard UARTs.
3 *
ccae941e 4 * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics
b497549a
BD		 5 * http://armlinux.simtec.co.uk/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10*/
11
12/* Hote on 2410 error handling
13 *
14 * The s3c2410 manual has a love/hate affair with the contents of the
15 * UERSTAT register in the UART blocks, and keeps marking some of the
16 * error bits as reserved. Having checked with the s3c2410x01,
17 * it copes with BREAKs properly, so I am happy to ignore the RESERVED
18 * feature from the latter versions of the manual.
19 *
20 * If it becomes aparrent that latter versions of the 2410 remove these
21 * bits, then action will have to be taken to differentiate the versions
22 * and change the policy on BREAK
23 *
24 * BJD, 04-Nov-2004
25*/
26
27#if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
28#define SUPPORT_SYSRQ
29#endif
30
31#include <linux/module.h>
32#include <linux/ioport.h>
33#include <linux/io.h>
34#include <linux/platform_device.h>
35#include <linux/init.h>
36#include <linux/sysrq.h>
37#include <linux/console.h>
38#include <linux/tty.h>
39#include <linux/tty_flip.h>
40#include <linux/serial_core.h>
41#include <linux/serial.h>
42#include <linux/delay.h>
43#include <linux/clk.h>
30555476 44#include <linux/cpufreq.h>
b497549a
BD		 45
46#include <asm/irq.h>
47
a09e64fb 48#include <mach/hardware.h>
b690ace5 49#include <mach/map.h>
b497549a 50
a2b7ba9c 51#include <plat/regs-serial.h>
b497549a
BD		 52
53#include "samsung.h"
54
55/* UART name and device definitions */
56
57#define S3C24XX_SERIAL_NAME "ttySAC"
58#define S3C24XX_SERIAL_MAJOR 204
59#define S3C24XX_SERIAL_MINOR 64
60
b497549a
BD		 61/* macros to change one thing to another */
62
63#define tx_enabled(port) ((port)->unused[0])
64#define rx_enabled(port) ((port)->unused[1])
65
25985edc 66/* flag to ignore all characters coming in */
b497549a
BD		 67#define RXSTAT_DUMMY_READ (0x10000000)
68
69static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port)
70{
71 return container_of(port, struct s3c24xx_uart_port, port);
72}
73
74/* translate a port to the device name */
75
76static inline const char *s3c24xx_serial_portname(struct uart_port *port)
77{
78 return to_platform_device(port->dev)->name;
79}
80
81static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
82{
83 return (rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE);
84}
85
86static void s3c24xx_serial_rx_enable(struct uart_port *port)
87{
88 unsigned long flags;
89 unsigned int ucon, ufcon;
90 int count = 10000;
91
92 spin_lock_irqsave(&port->lock, flags);
93
94 while (--count && !s3c24xx_serial_txempty_nofifo(port))
95 udelay(100);
96
97 ufcon = rd_regl(port, S3C2410_UFCON);
98 ufcon |= S3C2410_UFCON_RESETRX;
99 wr_regl(port, S3C2410_UFCON, ufcon);
100
101 ucon = rd_regl(port, S3C2410_UCON);
102 ucon |= S3C2410_UCON_RXIRQMODE;
103 wr_regl(port, S3C2410_UCON, ucon);
104
105 rx_enabled(port) = 1;
106 spin_unlock_irqrestore(&port->lock, flags);
107}
108
109static void s3c24xx_serial_rx_disable(struct uart_port *port)
110{
111 unsigned long flags;
112 unsigned int ucon;
113
114 spin_lock_irqsave(&port->lock, flags);
115
116 ucon = rd_regl(port, S3C2410_UCON);
117 ucon &= ~S3C2410_UCON_RXIRQMODE;
118 wr_regl(port, S3C2410_UCON, ucon);
119
120 rx_enabled(port) = 0;
121 spin_unlock_irqrestore(&port->lock, flags);
122}
123
124static void s3c24xx_serial_stop_tx(struct uart_port *port)
125{
b73c289c
BD		 126 struct s3c24xx_uart_port *ourport = to_ourport(port);
127
b497549a 128 if (tx_enabled(port)) {
41609ff4 129 disable_irq_nosync(ourport->tx_irq);
b497549a
BD		 130 tx_enabled(port) = 0;
131 if (port->flags & UPF_CONS_FLOW)
132 s3c24xx_serial_rx_enable(port);
133 }
134}
135
136static void s3c24xx_serial_start_tx(struct uart_port *port)
137{
b73c289c
BD		 138 struct s3c24xx_uart_port *ourport = to_ourport(port);
139
b497549a
BD		 140 if (!tx_enabled(port)) {
141 if (port->flags & UPF_CONS_FLOW)
142 s3c24xx_serial_rx_disable(port);
143
b73c289c 144 enable_irq(ourport->tx_irq);
b497549a
BD		 145 tx_enabled(port) = 1;
146 }
147}
148
149
150static void s3c24xx_serial_stop_rx(struct uart_port *port)
151{
b73c289c
BD		 152 struct s3c24xx_uart_port *ourport = to_ourport(port);
153
b497549a
BD		 154 if (rx_enabled(port)) {
155 dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
41609ff4 156 disable_irq_nosync(ourport->rx_irq);
b497549a
BD		 157 rx_enabled(port) = 0;
158 }
159}
160
161static void s3c24xx_serial_enable_ms(struct uart_port *port)
162{
163}
164
165static inline struct s3c24xx_uart_info *s3c24xx_port_to_info(struct uart_port *port)
166{
167 return to_ourport(port)->info;
168}
169
170static inline struct s3c2410_uartcfg *s3c24xx_port_to_cfg(struct uart_port *port)
171{
172 if (port->dev == NULL)
173 return NULL;
174
175 return (struct s3c2410_uartcfg *)port->dev->platform_data;
176}
177
178static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
179 unsigned long ufstat)
180{
181 struct s3c24xx_uart_info *info = ourport->info;
182
183 if (ufstat & info->rx_fifofull)
184 return info->fifosize;
185
186 return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
187}
188
189
190/* ? - where has parity gone?? */
191#define S3C2410_UERSTAT_PARITY (0x1000)
192
193static irqreturn_t
194s3c24xx_serial_rx_chars(int irq, void *dev_id)
195{
196 struct s3c24xx_uart_port *ourport = dev_id;
197 struct uart_port *port = &ourport->port;
ebd2c8f6 198 struct tty_struct *tty = port->state->port.tty;
b497549a
BD		 199 unsigned int ufcon, ch, flag, ufstat, uerstat;
200 int max_count = 64;
201
202 while (max_count-- > 0) {
203 ufcon = rd_regl(port, S3C2410_UFCON);
204 ufstat = rd_regl(port, S3C2410_UFSTAT);
205
206 if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
207 break;
208
209 uerstat = rd_regl(port, S3C2410_UERSTAT);
210 ch = rd_regb(port, S3C2410_URXH);
211
212 if (port->flags & UPF_CONS_FLOW) {
213 int txe = s3c24xx_serial_txempty_nofifo(port);
214
215 if (rx_enabled(port)) {
216 if (!txe) {
217 rx_enabled(port) = 0;
218 continue;
219 }
220 } else {
221 if (txe) {
222 ufcon |= S3C2410_UFCON_RESETRX;
223 wr_regl(port, S3C2410_UFCON, ufcon);
224 rx_enabled(port) = 1;
225 goto out;
226 }
227 continue;
228 }
229 }
230
231 /* insert the character into the buffer */
232
233 flag = TTY_NORMAL;
234 port->icount.rx++;
235
236 if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) {
237 dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n",
238 ch, uerstat);
239
240 /* check for break */
241 if (uerstat & S3C2410_UERSTAT_BREAK) {
242 dbg("break!\n");
243 port->icount.brk++;
244 if (uart_handle_break(port))
245 goto ignore_char;
246 }
247
248 if (uerstat & S3C2410_UERSTAT_FRAME)
249 port->icount.frame++;
250 if (uerstat & S3C2410_UERSTAT_OVERRUN)
251 port->icount.overrun++;
252
253 uerstat &= port->read_status_mask;
254
255 if (uerstat & S3C2410_UERSTAT_BREAK)
256 flag = TTY_BREAK;
257 else if (uerstat & S3C2410_UERSTAT_PARITY)
258 flag = TTY_PARITY;
259 else if (uerstat & (S3C2410_UERSTAT_FRAME |
260 S3C2410_UERSTAT_OVERRUN))
261 flag = TTY_FRAME;
262 }
263
264 if (uart_handle_sysrq_char(port, ch))
265 goto ignore_char;
266
267 uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN,
268 ch, flag);
269
270 ignore_char:
271 continue;
272 }
273 tty_flip_buffer_push(tty);
274
275 out:
276 return IRQ_HANDLED;
277}
278
279static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
280{
281 struct s3c24xx_uart_port *ourport = id;
282 struct uart_port *port = &ourport->port;
ebd2c8f6 283 struct circ_buf *xmit = &port->state->xmit;
b497549a
BD		 284 int count = 256;
285
286 if (port->x_char) {
287 wr_regb(port, S3C2410_UTXH, port->x_char);
288 port->icount.tx++;
289 port->x_char = 0;
290 goto out;
291 }
292
25985edc 293 /* if there isn't anything more to transmit, or the uart is now
b497549a
BD		 294 * stopped, disable the uart and exit
295 */
296
297 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
298 s3c24xx_serial_stop_tx(port);
299 goto out;
300 }
301
302 /* try and drain the buffer... */
303
304 while (!uart_circ_empty(xmit) && count-- > 0) {
305 if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
306 break;
307
308 wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
309 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
310 port->icount.tx++;
311 }
312
313 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
314 uart_write_wakeup(port);
315
316 if (uart_circ_empty(xmit))
317 s3c24xx_serial_stop_tx(port);
318
319 out:
320 return IRQ_HANDLED;
321}
322
323static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
324{
325 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
326 unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT);
327 unsigned long ufcon = rd_regl(port, S3C2410_UFCON);
328
329 if (ufcon & S3C2410_UFCON_FIFOMODE) {
330 if ((ufstat & info->tx_fifomask) != 0 ||
331 (ufstat & info->tx_fifofull))
332 return 0;
333
334 return 1;
335 }
336
337 return s3c24xx_serial_txempty_nofifo(port);
338}
339
340/* no modem control lines */
341static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
342{
343 unsigned int umstat = rd_regb(port, S3C2410_UMSTAT);
344
345 if (umstat & S3C2410_UMSTAT_CTS)
346 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
347 else
348 return TIOCM_CAR | TIOCM_DSR;
349}
350
351static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
352{
353 /* todo - possibly remove AFC and do manual CTS */
354}
355
356static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
357{
358 unsigned long flags;
359 unsigned int ucon;
360
361 spin_lock_irqsave(&port->lock, flags);
362
363 ucon = rd_regl(port, S3C2410_UCON);
364
365 if (break_state)
366 ucon |= S3C2410_UCON_SBREAK;
367 else
368 ucon &= ~S3C2410_UCON_SBREAK;
369
370 wr_regl(port, S3C2410_UCON, ucon);
371
372 spin_unlock_irqrestore(&port->lock, flags);
373}
374
375static void s3c24xx_serial_shutdown(struct uart_port *port)
376{
377 struct s3c24xx_uart_port *ourport = to_ourport(port);
378
379 if (ourport->tx_claimed) {
b73c289c 380 free_irq(ourport->tx_irq, ourport);
b497549a
BD		 381 tx_enabled(port) = 0;
382 ourport->tx_claimed = 0;
383 }
384
385 if (ourport->rx_claimed) {
b73c289c 386 free_irq(ourport->rx_irq, ourport);
b497549a
BD		 387 ourport->rx_claimed = 0;
388 rx_enabled(port) = 0;
389 }
390}
391
392
393static int s3c24xx_serial_startup(struct uart_port *port)
394{
395 struct s3c24xx_uart_port *ourport = to_ourport(port);
396 int ret;
397
398 dbg("s3c24xx_serial_startup: port=%p (%08lx,%p)\n",
399 port->mapbase, port->membase);
400
401 rx_enabled(port) = 1;
402
b73c289c 403 ret = request_irq(ourport->rx_irq, s3c24xx_serial_rx_chars, 0,
b497549a
BD		 404 s3c24xx_serial_portname(port), ourport);
405
406 if (ret != 0) {
b73c289c 407 printk(KERN_ERR "cannot get irq %d\n", ourport->rx_irq);
b497549a
BD		 408 return ret;
409 }
410
411 ourport->rx_claimed = 1;
412
413 dbg("requesting tx irq...\n");
414
415 tx_enabled(port) = 1;
416
b73c289c 417 ret = request_irq(ourport->tx_irq, s3c24xx_serial_tx_chars, 0,
b497549a
BD		 418 s3c24xx_serial_portname(port), ourport);
419
420 if (ret) {
b73c289c 421 printk(KERN_ERR "cannot get irq %d\n", ourport->tx_irq);
b497549a
BD		 422 goto err;
423 }
424
425 ourport->tx_claimed = 1;
426
427 dbg("s3c24xx_serial_startup ok\n");
428
429 /* the port reset code should have done the correct
430 * register setup for the port controls */
431
432 return ret;
433
434 err:
435 s3c24xx_serial_shutdown(port);
436 return ret;
437}
438
439/* power power management control */
440
441static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
442 unsigned int old)
443{
444 struct s3c24xx_uart_port *ourport = to_ourport(port);
445
30555476
BD		 446 ourport->pm_level = level;
447
b497549a
BD		 448 switch (level) {
449 case 3:
450 if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL)
451 clk_disable(ourport->baudclk);
452
453 clk_disable(ourport->clk);
454 break;
455
456 case 0:
457 clk_enable(ourport->clk);
458
459 if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL)
460 clk_enable(ourport->baudclk);
461
462 break;
463 default:
464 printk(KERN_ERR "s3c24xx_serial: unknown pm %d\n", level);
465 }
466}
467
468/* baud rate calculation
469 *
470 * The UARTs on the S3C2410/S3C2440 can take their clocks from a number
471 * of different sources, including the peripheral clock ("pclk") and an
472 * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk")
473 * with a programmable extra divisor.
474 *
475 * The following code goes through the clock sources, and calculates the
476 * baud clocks (and the resultant actual baud rates) and then tries to
477 * pick the closest one and select that.
478 *
479*/
480
481
482#define MAX_CLKS (8)
483
484static struct s3c24xx_uart_clksrc tmp_clksrc = {
485 .name = "pclk",
486 .min_baud = 0,
487 .max_baud = 0,
488 .divisor = 1,
489};
490
491static inline int
492s3c24xx_serial_getsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c)
493{
494 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
495
496 return (info->get_clksrc)(port, c);
497}
498
499static inline int
500s3c24xx_serial_setsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c)
501{
502 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
503
504 return (info->set_clksrc)(port, c);
505}
506
507struct baud_calc {
508 struct s3c24xx_uart_clksrc *clksrc;
509 unsigned int calc;
090f848d 510 unsigned int divslot;
b497549a
BD		 511 unsigned int quot;
512 struct clk *src;
513};
514
515static int s3c24xx_serial_calcbaud(struct baud_calc *calc,
516 struct uart_port *port,
517 struct s3c24xx_uart_clksrc *clksrc,
518 unsigned int baud)
519{
090f848d 520 struct s3c24xx_uart_port *ourport = to_ourport(port);
b497549a
BD		 521 unsigned long rate;
522
523 calc->src = clk_get(port->dev, clksrc->name);
524 if (calc->src == NULL || IS_ERR(calc->src))
525 return 0;
526
527 rate = clk_get_rate(calc->src);
528 rate /= clksrc->divisor;
529
530 calc->clksrc = clksrc;
090f848d
BD		 531
532 if (ourport->info->has_divslot) {
533 unsigned long div = rate / baud;
534
535 /* The UDIVSLOT register on the newer UARTs allows us to
536 * get a divisor adjustment of 1/16th on the baud clock.
537 *
538 * We don't keep the UDIVSLOT value (the 16ths we calculated
539 * by not multiplying the baud by 16) as it is easy enough
540 * to recalculate.
541 */
542
543 calc->quot = div / 16;
544 calc->calc = rate / div;
545 } else {
546 calc->quot = (rate + (8 * baud)) / (16 * baud);
547 calc->calc = (rate / (calc->quot * 16));
548 }
b497549a
BD		 549
550 calc->quot--;
551 return 1;
552}
553
554static unsigned int s3c24xx_serial_getclk(struct uart_port *port,
555 struct s3c24xx_uart_clksrc **clksrc,
556 struct clk **clk,
557 unsigned int baud)
558{
559 struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
560 struct s3c24xx_uart_clksrc *clkp;
561 struct baud_calc res[MAX_CLKS];
562 struct baud_calc *resptr, *best, *sptr;
563 int i;
564
565 clkp = cfg->clocks;
566 best = NULL;
567
568 if (cfg->clocks_size < 2) {
569 if (cfg->clocks_size == 0)
570 clkp = &tmp_clksrc;
571
572 /* check to see if we're sourcing fclk, and if so we're
573 * going to have to update the clock source
574 */
575
576 if (strcmp(clkp->name, "fclk") == 0) {
577 struct s3c24xx_uart_clksrc src;
578
579 s3c24xx_serial_getsource(port, &src);
580
581 /* check that the port already using fclk, and if
582 * not, then re-select fclk
583 */
584
585 if (strcmp(src.name, clkp->name) == 0) {
586 s3c24xx_serial_setsource(port, clkp);
587 s3c24xx_serial_getsource(port, &src);
588 }
589
590 clkp->divisor = src.divisor;
591 }
592
593 s3c24xx_serial_calcbaud(res, port, clkp, baud);
594 best = res;
595 resptr = best + 1;
596 } else {
597 resptr = res;
598
599 for (i = 0; i < cfg->clocks_size; i++, clkp++) {
600 if (s3c24xx_serial_calcbaud(resptr, port, clkp, baud))
601 resptr++;
602 }
603 }
604
605 /* ok, we now need to select the best clock we found */
606
607 if (!best) {
608 unsigned int deviation = (1<<30)|((1<<30)-1);
609 int calc_deviation;
610
611 for (sptr = res; sptr < resptr; sptr++) {
612 calc_deviation = baud - sptr->calc;
613 if (calc_deviation < 0)
614 calc_deviation = -calc_deviation;
615
616 if (calc_deviation < deviation) {
617 best = sptr;
618 deviation = calc_deviation;
619 }
620 }
621 }
622
623 /* store results to pass back */
624
625 *clksrc = best->clksrc;
626 *clk = best->src;
627
628 return best->quot;
629}
630
090f848d
BD		 631/* udivslot_table[]
632 *
633 * This table takes the fractional value of the baud divisor and gives
634 * the recommended setting for the UDIVSLOT register.
635 */
636static u16 udivslot_table[16] = {
637 [0] = 0x0000,
638 [1] = 0x0080,
639 [2] = 0x0808,
640 [3] = 0x0888,
641 [4] = 0x2222,
642 [5] = 0x4924,
643 [6] = 0x4A52,
644 [7] = 0x54AA,
645 [8] = 0x5555,
646 [9] = 0xD555,
647 [10] = 0xD5D5,
648 [11] = 0xDDD5,
649 [12] = 0xDDDD,
650 [13] = 0xDFDD,
651 [14] = 0xDFDF,
652 [15] = 0xFFDF,
653};
654
b497549a
BD		 655static void s3c24xx_serial_set_termios(struct uart_port *port,
656 struct ktermios *termios,
657 struct ktermios *old)
658{
659 struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
660 struct s3c24xx_uart_port *ourport = to_ourport(port);
661 struct s3c24xx_uart_clksrc *clksrc = NULL;
662 struct clk *clk = NULL;
663 unsigned long flags;
664 unsigned int baud, quot;
665 unsigned int ulcon;
666 unsigned int umcon;
090f848d 667 unsigned int udivslot = 0;
b497549a
BD		 668
669 /*
670 * We don't support modem control lines.
671 */
672 termios->c_cflag &= ~(HUPCL | CMSPAR);
673 termios->c_cflag |= CLOCAL;
674
675 /*
676 * Ask the core to calculate the divisor for us.
677 */
678
679 baud = uart_get_baud_rate(port, termios, old, 0, 115200*8);
680
681 if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
682 quot = port->custom_divisor;
683 else
684 quot = s3c24xx_serial_getclk(port, &clksrc, &clk, baud);
685
686 /* check to see if we need to change clock source */
687
688 if (ourport->clksrc != clksrc || ourport->baudclk != clk) {
090f848d 689 dbg("selecting clock %p\n", clk);
b497549a
BD		 690 s3c24xx_serial_setsource(port, clksrc);
691
692 if (ourport->baudclk != NULL && !IS_ERR(ourport->baudclk)) {
693 clk_disable(ourport->baudclk);
694 ourport->baudclk = NULL;
695 }
696
697 clk_enable(clk);
698
699 ourport->clksrc = clksrc;
700 ourport->baudclk = clk;
30555476 701 ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0;
b497549a
BD		 702 }
703
090f848d
BD		 704 if (ourport->info->has_divslot) {
705 unsigned int div = ourport->baudclk_rate / baud;
706
8b526ae4
JL		 707 if (cfg->has_fracval) {
708 udivslot = (div & 15);
709 dbg("fracval = %04x\n", udivslot);
710 } else {
711 udivslot = udivslot_table[div & 15];
712 dbg("udivslot = %04x (div %d)\n", udivslot, div & 15);
713 }
090f848d
BD		 714 }
715
b497549a
BD		 716 switch (termios->c_cflag & CSIZE) {
717 case CS5:
718 dbg("config: 5bits/char\n");
719 ulcon = S3C2410_LCON_CS5;
720 break;
721 case CS6:
722 dbg("config: 6bits/char\n");
723 ulcon = S3C2410_LCON_CS6;
724 break;
725 case CS7:
726 dbg("config: 7bits/char\n");
727 ulcon = S3C2410_LCON_CS7;
728 break;
729 case CS8:
730 default:
731 dbg("config: 8bits/char\n");
732 ulcon = S3C2410_LCON_CS8;
733 break;
734 }
735
736 /* preserve original lcon IR settings */
737 ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
738
739 if (termios->c_cflag & CSTOPB)
740 ulcon |= S3C2410_LCON_STOPB;
741
742 umcon = (termios->c_cflag & CRTSCTS) ? S3C2410_UMCOM_AFC : 0;
743
744 if (termios->c_cflag & PARENB) {
745 if (termios->c_cflag & PARODD)
746 ulcon |= S3C2410_LCON_PODD;
747 else
748 ulcon |= S3C2410_LCON_PEVEN;
749 } else {
750 ulcon |= S3C2410_LCON_PNONE;
751 }
752
753 spin_lock_irqsave(&port->lock, flags);
754
090f848d
BD		 755 dbg("setting ulcon to %08x, brddiv to %d, udivslot %08x\n",
756 ulcon, quot, udivslot);
b497549a
BD		 757
758 wr_regl(port, S3C2410_ULCON, ulcon);
759 wr_regl(port, S3C2410_UBRDIV, quot);
760 wr_regl(port, S3C2410_UMCON, umcon);
761
090f848d
BD		 762 if (ourport->info->has_divslot)
763 wr_regl(port, S3C2443_DIVSLOT, udivslot);
764
b497549a
BD		 765 dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
766 rd_regl(port, S3C2410_ULCON),
767 rd_regl(port, S3C2410_UCON),
768 rd_regl(port, S3C2410_UFCON));
769
770 /*
771 * Update the per-port timeout.
772 */
773 uart_update_timeout(port, termios->c_cflag, baud);
774
775 /*
776 * Which character status flags are we interested in?
777 */
778 port->read_status_mask = S3C2410_UERSTAT_OVERRUN;
779 if (termios->c_iflag & INPCK)
780 port->read_status_mask |= S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_PARITY;
781
782 /*
783 * Which character status flags should we ignore?
784 */
785 port->ignore_status_mask = 0;
786 if (termios->c_iflag & IGNPAR)
787 port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN;
788 if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
789 port->ignore_status_mask |= S3C2410_UERSTAT_FRAME;
790
791 /*
792 * Ignore all characters if CREAD is not set.
793 */
794 if ((termios->c_cflag & CREAD) == 0)
795 port->ignore_status_mask |= RXSTAT_DUMMY_READ;
796
797 spin_unlock_irqrestore(&port->lock, flags);
798}
799
800static const char *s3c24xx_serial_type(struct uart_port *port)
801{
802 switch (port->type) {
803 case PORT_S3C2410:
804 return "S3C2410";
805 case PORT_S3C2440:
806 return "S3C2440";
807 case PORT_S3C2412:
808 return "S3C2412";
b690ace5
BD		 809 case PORT_S3C6400:
810 return "S3C6400/10";
b497549a
BD		 811 default:
812 return NULL;
813 }
814}
815
816#define MAP_SIZE (0x100)
817
818static void s3c24xx_serial_release_port(struct uart_port *port)
819{
820 release_mem_region(port->mapbase, MAP_SIZE);
821}
822
823static int s3c24xx_serial_request_port(struct uart_port *port)
824{
825 const char *name = s3c24xx_serial_portname(port);
826 return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY;
827}
828
829static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
830{
831 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
832
833 if (flags & UART_CONFIG_TYPE &&
834 s3c24xx_serial_request_port(port) == 0)
835 port->type = info->type;
836}
837
838/*
839 * verify the new serial_struct (for TIOCSSERIAL).
840 */
841static int
842s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
843{
844 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
845
846 if (ser->type != PORT_UNKNOWN && ser->type != info->type)
847 return -EINVAL;
848
849 return 0;
850}
851
852
853#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
854
855static struct console s3c24xx_serial_console;
856
857#define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
858#else
859#define S3C24XX_SERIAL_CONSOLE NULL
860#endif
861
862static struct uart_ops s3c24xx_serial_ops = {
863 .pm = s3c24xx_serial_pm,
864 .tx_empty = s3c24xx_serial_tx_empty,
865 .get_mctrl = s3c24xx_serial_get_mctrl,
866 .set_mctrl = s3c24xx_serial_set_mctrl,
867 .stop_tx = s3c24xx_serial_stop_tx,
868 .start_tx = s3c24xx_serial_start_tx,
869 .stop_rx = s3c24xx_serial_stop_rx,
870 .enable_ms = s3c24xx_serial_enable_ms,
871 .break_ctl = s3c24xx_serial_break_ctl,
872 .startup = s3c24xx_serial_startup,
873 .shutdown = s3c24xx_serial_shutdown,
874 .set_termios = s3c24xx_serial_set_termios,
875 .type = s3c24xx_serial_type,
876 .release_port = s3c24xx_serial_release_port,
877 .request_port = s3c24xx_serial_request_port,
878 .config_port = s3c24xx_serial_config_port,
879 .verify_port = s3c24xx_serial_verify_port,
880};
881
882
883static struct uart_driver s3c24xx_uart_drv = {
884 .owner = THIS_MODULE,
2cf0c58e 885 .driver_name = "s3c2410_serial",
bdd4915a 886 .nr = CONFIG_SERIAL_SAMSUNG_UARTS,
b497549a 887 .cons = S3C24XX_SERIAL_CONSOLE,
2cf0c58e 888 .dev_name = S3C24XX_SERIAL_NAME,
b497549a
BD		 889 .major = S3C24XX_SERIAL_MAJOR,
890 .minor = S3C24XX_SERIAL_MINOR,
891};
892
03d5e77b 893static struct s3c24xx_uart_port s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = {
b497549a
BD		 894 [0] = {
895 .port = {
896 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[0].port.lock),
897 .iotype = UPIO_MEM,
898 .irq = IRQ_S3CUART_RX0,
899 .uartclk = 0,
900 .fifosize = 16,
901 .ops = &s3c24xx_serial_ops,
902 .flags = UPF_BOOT_AUTOCONF,
903 .line = 0,
904 }
905 },
906 [1] = {
907 .port = {
908 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[1].port.lock),
909 .iotype = UPIO_MEM,
910 .irq = IRQ_S3CUART_RX1,
911 .uartclk = 0,
912 .fifosize = 16,
913 .ops = &s3c24xx_serial_ops,
914 .flags = UPF_BOOT_AUTOCONF,
915 .line = 1,
916 }
917 },
03d5e77b 918#if CONFIG_SERIAL_SAMSUNG_UARTS > 2
b497549a
BD		 919
920 [2] = {
921 .port = {
922 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[2].port.lock),
923 .iotype = UPIO_MEM,
924 .irq = IRQ_S3CUART_RX2,
925 .uartclk = 0,
926 .fifosize = 16,
927 .ops = &s3c24xx_serial_ops,
928 .flags = UPF_BOOT_AUTOCONF,
929 .line = 2,
930 }
03d5e77b
BD		 931 },
932#endif
933#if CONFIG_SERIAL_SAMSUNG_UARTS > 3
934 [3] = {
935 .port = {
936 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[3].port.lock),
937 .iotype = UPIO_MEM,
938 .irq = IRQ_S3CUART_RX3,
939 .uartclk = 0,
940 .fifosize = 16,
941 .ops = &s3c24xx_serial_ops,
942 .flags = UPF_BOOT_AUTOCONF,
943 .line = 3,
944 }
b497549a
BD		 945 }
946#endif
947};
948
949/* s3c24xx_serial_resetport
950 *
951 * wrapper to call the specific reset for this port (reset the fifos
952 * and the settings)
953*/
954
955static inline int s3c24xx_serial_resetport(struct uart_port *port,
956 struct s3c2410_uartcfg *cfg)
957{
958 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
959
960 return (info->reset_port)(port, cfg);
961}
962
30555476
BD		 963
964#ifdef CONFIG_CPU_FREQ
965
966static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb,
967 unsigned long val, void *data)
968{
969 struct s3c24xx_uart_port *port;
970 struct uart_port *uport;
971
972 port = container_of(nb, struct s3c24xx_uart_port, freq_transition);
973 uport = &port->port;
974
975 /* check to see if port is enabled */
976
977 if (port->pm_level != 0)
978 return 0;
979
980 /* try and work out if the baudrate is changing, we can detect
981 * a change in rate, but we do not have support for detecting
982 * a disturbance in the clock-rate over the change.
983 */
984
985 if (IS_ERR(port->clk))
986 goto exit;
987
988 if (port->baudclk_rate == clk_get_rate(port->clk))
989 goto exit;
990
991 if (val == CPUFREQ_PRECHANGE) {
992 /* we should really shut the port down whilst the
993 * frequency change is in progress. */
994
995 } else if (val == CPUFREQ_POSTCHANGE) {
996 struct ktermios *termios;
997 struct tty_struct *tty;
998
ebd2c8f6 999 if (uport->state == NULL)
30555476 1000 goto exit;
30555476 1001
ebd2c8f6 1002 tty = uport->state->port.tty;
30555476 1003
7de40c21 1004 if (tty == NULL)
30555476 1005 goto exit;
30555476
BD		 1006
1007 termios = tty->termios;
1008
1009 if (termios == NULL) {
1010 printk(KERN_WARNING "%s: no termios?\n", __func__);
1011 goto exit;
1012 }
1013
1014 s3c24xx_serial_set_termios(uport, termios, NULL);
1015 }
1016
1017 exit:
1018 return 0;
1019}
1020
1021static inline int s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1022{
1023 port->freq_transition.notifier_call = s3c24xx_serial_cpufreq_transition;
1024
1025 return cpufreq_register_notifier(&port->freq_transition,
1026 CPUFREQ_TRANSITION_NOTIFIER);
1027}
1028
1029static inline void s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1030{
1031 cpufreq_unregister_notifier(&port->freq_transition,
1032 CPUFREQ_TRANSITION_NOTIFIER);
1033}
1034
1035#else
1036static inline int s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1037{
1038 return 0;
1039}
1040
1041static inline void s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1042{
1043}
1044#endif
1045
b497549a
BD		 1046/* s3c24xx_serial_init_port
1047 *
1048 * initialise a single serial port from the platform device given
1049 */
1050
1051static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
1052 struct s3c24xx_uart_info *info,
1053 struct platform_device *platdev)
1054{
1055 struct uart_port *port = &ourport->port;
1056 struct s3c2410_uartcfg *cfg;
1057 struct resource *res;
1058 int ret;
1059
1060 dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev);
1061
1062 if (platdev == NULL)
1063 return -ENODEV;
1064
1065 cfg = s3c24xx_dev_to_cfg(&platdev->dev);
1066
1067 if (port->mapbase != 0)
1068 return 0;
1069
bdd4915a
BD		 1070 if (cfg->hwport > CONFIG_SERIAL_SAMSUNG_UARTS) {
1071 printk(KERN_ERR "%s: port %d bigger than %d\n", __func__,
1072 cfg->hwport, CONFIG_SERIAL_SAMSUNG_UARTS);
1073 return -ERANGE;
1074 }
b497549a
BD		 1075
1076 /* setup info for port */
1077 port->dev = &platdev->dev;
1078 ourport->info = info;
1079
1080 /* copy the info in from provided structure */
1081 ourport->port.fifosize = info->fifosize;
1082
1083 dbg("s3c24xx_serial_init_port: %p (hw %d)...\n", port, cfg->hwport);
1084
1085 port->uartclk = 1;
1086
1087 if (cfg->uart_flags & UPF_CONS_FLOW) {
1088 dbg("s3c24xx_serial_init_port: enabling flow control\n");
1089 port->flags |= UPF_CONS_FLOW;
1090 }
1091
1092 /* sort our the physical and virtual addresses for each UART */
1093
1094 res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
1095 if (res == NULL) {
1096 printk(KERN_ERR "failed to find memory resource for uart\n");
1097 return -EINVAL;
1098 }
1099
1100 dbg("resource %p (%lx..%lx)\n", res, res->start, res->end);
1101
b690ace5 1102 port->mapbase = res->start;
2555e663 1103 port->membase = S3C_VA_UART + (res->start & 0xfffff);
b497549a
BD		 1104 ret = platform_get_irq(platdev, 0);
1105 if (ret < 0)
1106 port->irq = 0;
b73c289c 1107 else {
b497549a 1108 port->irq = ret;
b73c289c
BD		 1109 ourport->rx_irq = ret;
1110 ourport->tx_irq = ret + 1;
1111 }
1112
1113 ret = platform_get_irq(platdev, 1);
1114 if (ret > 0)
1115 ourport->tx_irq = ret;
b497549a
BD		 1116
1117 ourport->clk = clk_get(&platdev->dev, "uart");
1118
b73c289c
BD		 1119 dbg("port: map=%08x, mem=%08x, irq=%d (%d,%d), clock=%ld\n",
1120 port->mapbase, port->membase, port->irq,
1121 ourport->rx_irq, ourport->tx_irq, port->uartclk);
b497549a
BD		 1122
1123 /* reset the fifos (and setup the uart) */
1124 s3c24xx_serial_resetport(port, cfg);
1125 return 0;
1126}
1127
1128static ssize_t s3c24xx_serial_show_clksrc(struct device *dev,
1129 struct device_attribute *attr,
1130 char *buf)
1131{
1132 struct uart_port *port = s3c24xx_dev_to_port(dev);
1133 struct s3c24xx_uart_port *ourport = to_ourport(port);
1134
1135 return snprintf(buf, PAGE_SIZE, "* %s\n", ourport->clksrc->name);
1136}
1137
1138static DEVICE_ATTR(clock_source, S_IRUGO, s3c24xx_serial_show_clksrc, NULL);
1139
1140/* Device driver serial port probe */
1141
1142static int probe_index;
1143
1144int s3c24xx_serial_probe(struct platform_device *dev,
1145 struct s3c24xx_uart_info *info)
1146{
1147 struct s3c24xx_uart_port *ourport;
1148 int ret;
1149
1150 dbg("s3c24xx_serial_probe(%p, %p) %d\n", dev, info, probe_index);
1151
1152 ourport = &s3c24xx_serial_ports[probe_index];
1153 probe_index++;
1154
1155 dbg("%s: initialising port %p...\n", __func__, ourport);
1156
1157 ret = s3c24xx_serial_init_port(ourport, info, dev);
1158 if (ret < 0)
1159 goto probe_err;
1160
1161 dbg("%s: adding port\n", __func__);
1162 uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
1163 platform_set_drvdata(dev, &ourport->port);
1164
1165 ret = device_create_file(&dev->dev, &dev_attr_clock_source);
1166 if (ret < 0)
1167 printk(KERN_ERR "%s: failed to add clksrc attr.\n", __func__);
1168
30555476
BD		 1169 ret = s3c24xx_serial_cpufreq_register(ourport);
1170 if (ret < 0)
1171 dev_err(&dev->dev, "failed to add cpufreq notifier\n");
1172
b497549a
BD		 1173 return 0;
1174
1175 probe_err:
1176 return ret;
1177}
1178
1179EXPORT_SYMBOL_GPL(s3c24xx_serial_probe);
1180
90ceb964 1181int __devexit s3c24xx_serial_remove(struct platform_device *dev)
b497549a
BD		 1182{
1183 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1184
1185 if (port) {
30555476 1186 s3c24xx_serial_cpufreq_deregister(to_ourport(port));
b497549a
BD		 1187 device_remove_file(&dev->dev, &dev_attr_clock_source);
1188 uart_remove_one_port(&s3c24xx_uart_drv, port);
1189 }
1190
1191 return 0;
1192}
1193
1194EXPORT_SYMBOL_GPL(s3c24xx_serial_remove);
1195
1196/* UART power management code */
1197
1198#ifdef CONFIG_PM
1199
1200static int s3c24xx_serial_suspend(struct platform_device *dev, pm_message_t state)
1201{
1202 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1203
1204 if (port)
1205 uart_suspend_port(&s3c24xx_uart_drv, port);
1206
1207 return 0;
1208}
1209
1210static int s3c24xx_serial_resume(struct platform_device *dev)
1211{
1212 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1213 struct s3c24xx_uart_port *ourport = to_ourport(port);
1214
1215 if (port) {
1216 clk_enable(ourport->clk);
1217 s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
1218 clk_disable(ourport->clk);
1219
1220 uart_resume_port(&s3c24xx_uart_drv, port);
1221 }
1222
1223 return 0;
1224}
1225#endif
1226
1227int s3c24xx_serial_init(struct platform_driver *drv,
1228 struct s3c24xx_uart_info *info)
1229{
1230 dbg("s3c24xx_serial_init(%p,%p)\n", drv, info);
1231
1232#ifdef CONFIG_PM
1233 drv->suspend = s3c24xx_serial_suspend;
1234 drv->resume = s3c24xx_serial_resume;
1235#endif
1236
1237 return platform_driver_register(drv);
1238}
1239
1240EXPORT_SYMBOL_GPL(s3c24xx_serial_init);
1241
1242/* module initialisation code */
1243
1244static int __init s3c24xx_serial_modinit(void)
1245{
1246 int ret;
1247
1248 ret = uart_register_driver(&s3c24xx_uart_drv);
1249 if (ret < 0) {
1250 printk(KERN_ERR "failed to register UART driver\n");
1251 return -1;
1252 }
1253
1254 return 0;
1255}
1256
1257static void __exit s3c24xx_serial_modexit(void)
1258{
1259 uart_unregister_driver(&s3c24xx_uart_drv);
1260}
1261
1262module_init(s3c24xx_serial_modinit);
1263module_exit(s3c24xx_serial_modexit);
1264
1265/* Console code */
1266
1267#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
1268
1269static struct uart_port *cons_uart;
1270
1271static int
1272s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
1273{
1274 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1275 unsigned long ufstat, utrstat;
1276
1277 if (ufcon & S3C2410_UFCON_FIFOMODE) {
9ddc5b6f 1278 /* fifo mode - check amount of data in fifo registers... */
b497549a
BD		 1279
1280 ufstat = rd_regl(port, S3C2410_UFSTAT);
1281 return (ufstat & info->tx_fifofull) ? 0 : 1;
1282 }
1283
1284 /* in non-fifo mode, we go and use the tx buffer empty */
1285
1286 utrstat = rd_regl(port, S3C2410_UTRSTAT);
1287 return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
1288}
1289
1290static void
1291s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
1292{
1293 unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON);
1294 while (!s3c24xx_serial_console_txrdy(port, ufcon))
1295 barrier();
1296 wr_regb(cons_uart, S3C2410_UTXH, ch);
1297}
1298
1299static void
1300s3c24xx_serial_console_write(struct console *co, const char *s,
1301 unsigned int count)
1302{
1303 uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
1304}
1305
1306static void __init
1307s3c24xx_serial_get_options(struct uart_port *port, int *baud,
1308 int *parity, int *bits)
1309{
1310 struct s3c24xx_uart_clksrc clksrc;
1311 struct clk *clk;
1312 unsigned int ulcon;
1313 unsigned int ucon;
1314 unsigned int ubrdiv;
1315 unsigned long rate;
1316
1317 ulcon = rd_regl(port, S3C2410_ULCON);
1318 ucon = rd_regl(port, S3C2410_UCON);
1319 ubrdiv = rd_regl(port, S3C2410_UBRDIV);
1320
1321 dbg("s3c24xx_serial_get_options: port=%p\n"
1322 "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
1323 port, ulcon, ucon, ubrdiv);
1324
1325 if ((ucon & 0xf) != 0) {
1326 /* consider the serial port configured if the tx/rx mode set */
1327
1328 switch (ulcon & S3C2410_LCON_CSMASK) {
1329 case S3C2410_LCON_CS5:
1330 *bits = 5;
1331 break;
1332 case S3C2410_LCON_CS6:
1333 *bits = 6;
1334 break;
1335 case S3C2410_LCON_CS7:
1336 *bits = 7;
1337 break;
1338 default:
1339 case S3C2410_LCON_CS8:
1340 *bits = 8;
1341 break;
1342 }
1343
1344 switch (ulcon & S3C2410_LCON_PMASK) {
1345 case S3C2410_LCON_PEVEN:
1346 *parity = 'e';
1347 break;
1348
1349 case S3C2410_LCON_PODD:
1350 *parity = 'o';
1351 break;
1352
1353 case S3C2410_LCON_PNONE:
1354 default:
1355 *parity = 'n';
1356 }
1357
1358 /* now calculate the baud rate */
1359
1360 s3c24xx_serial_getsource(port, &clksrc);
1361
1362 clk = clk_get(port->dev, clksrc.name);
1363 if (!IS_ERR(clk) && clk != NULL)
1364 rate = clk_get_rate(clk) / clksrc.divisor;
1365 else
1366 rate = 1;
1367
1368
1369 *baud = rate / (16 * (ubrdiv + 1));
1370 dbg("calculated baud %d\n", *baud);
1371 }
1372
1373}
1374
1375/* s3c24xx_serial_init_ports
1376 *
1377 * initialise the serial ports from the machine provided initialisation
1378 * data.
1379*/
1380
51fe5222 1381static int s3c24xx_serial_init_ports(struct s3c24xx_uart_info **info)
b497549a
BD		 1382{
1383 struct s3c24xx_uart_port *ptr = s3c24xx_serial_ports;
1384 struct platform_device **platdev_ptr;
1385 int i;
1386
1387 dbg("s3c24xx_serial_init_ports: initialising ports...\n");
1388
1389 platdev_ptr = s3c24xx_uart_devs;
1390
03d5e77b 1391 for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++, ptr++, platdev_ptr++) {
51fe5222 1392 s3c24xx_serial_init_port(ptr, info[i], *platdev_ptr);
b497549a
BD		 1393 }
1394
1395 return 0;
1396}
1397
1398static int __init
1399s3c24xx_serial_console_setup(struct console *co, char *options)
1400{
1401 struct uart_port *port;
1402 int baud = 9600;
1403 int bits = 8;
1404 int parity = 'n';
1405 int flow = 'n';
1406
1407 dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n",
1408 co, co->index, options);
1409
1410 /* is this a valid port */
1411
03d5e77b 1412 if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS)
b497549a
BD		 1413 co->index = 0;
1414
1415 port = &s3c24xx_serial_ports[co->index].port;
1416
1417 /* is the port configured? */
1418
ee430f16
TA		 1419 if (port->mapbase == 0x0)
1420 return -ENODEV;
b497549a
BD		 1421
1422 cons_uart = port;
1423
1424 dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index);
1425
1426 /*
1427 * Check whether an invalid uart number has been specified, and
1428 * if so, search for the first available port that does have
1429 * console support.
1430 */
1431 if (options)
1432 uart_parse_options(options, &baud, &parity, &bits, &flow);
1433 else
1434 s3c24xx_serial_get_options(port, &baud, &parity, &bits);
1435
1436 dbg("s3c24xx_serial_console_setup: baud %d\n", baud);
1437
1438 return uart_set_options(port, co, baud, parity, bits, flow);
1439}
1440
1441/* s3c24xx_serial_initconsole
1442 *
1443 * initialise the console from one of the uart drivers
1444*/
1445
1446static struct console s3c24xx_serial_console = {
1447 .name = S3C24XX_SERIAL_NAME,
1448 .device = uart_console_device,
1449 .flags = CON_PRINTBUFFER,
1450 .index = -1,
1451 .write = s3c24xx_serial_console_write,
1452 .setup = s3c24xx_serial_console_setup
1453};
1454
1455int s3c24xx_serial_initconsole(struct platform_driver *drv,
51fe5222 1456 struct s3c24xx_uart_info **info)
b497549a
BD		 1457
1458{
1459 struct platform_device *dev = s3c24xx_uart_devs[0];
1460
1461 dbg("s3c24xx_serial_initconsole\n");
1462
1463 /* select driver based on the cpu */
1464
1465 if (dev == NULL) {
1466 printk(KERN_ERR "s3c24xx: no devices for console init\n");
1467 return 0;
1468 }
1469
1470 if (strcmp(dev->name, drv->driver.name) != 0)
1471 return 0;
1472
1473 s3c24xx_serial_console.data = &s3c24xx_uart_drv;
1474 s3c24xx_serial_init_ports(info);
1475
1476 register_console(&s3c24xx_serial_console);
1477 return 0;
1478}
1479
1480#endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */
1481
1482MODULE_DESCRIPTION("Samsung SoC Serial port driver");
1483MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
1484MODULE_LICENSE("GPL v2");
Linux 6.x block layer and io_uring tree(s)