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serial: samsung: Remove NULL checking for baud clock
[deliverable/linux.git] / drivers / tty / serial / samsung.c
CommitLineData
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>
26c919e1 45#include <linux/of.h>
b497549a
BD		 46
47#include <asm/irq.h>
48
a09e64fb 49#include <mach/hardware.h>
b690ace5 50#include <mach/map.h>
b497549a 51
a2b7ba9c 52#include <plat/regs-serial.h>
5f5a7a55 53#include <plat/clock.h>
b497549a
BD		 54
55#include "samsung.h"
56
57/* UART name and device definitions */
58
59#define S3C24XX_SERIAL_NAME "ttySAC"
60#define S3C24XX_SERIAL_MAJOR 204
61#define S3C24XX_SERIAL_MINOR 64
62
b497549a
BD		 63/* macros to change one thing to another */
64
65#define tx_enabled(port) ((port)->unused[0])
66#define rx_enabled(port) ((port)->unused[1])
67
25985edc 68/* flag to ignore all characters coming in */
b497549a
BD		 69#define RXSTAT_DUMMY_READ (0x10000000)
70
71static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port)
72{
73 return container_of(port, struct s3c24xx_uart_port, port);
74}
75
76/* translate a port to the device name */
77
78static inline const char *s3c24xx_serial_portname(struct uart_port *port)
79{
80 return to_platform_device(port->dev)->name;
81}
82
83static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
84{
85 return (rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE);
86}
87
88bb4ea1
TA		 88/*
89 * s3c64xx and later SoC's include the interrupt mask and status registers in
90 * the controller itself, unlike the s3c24xx SoC's which have these registers
91 * in the interrupt controller. Check if the port type is s3c64xx or higher.
92 */
93static int s3c24xx_serial_has_interrupt_mask(struct uart_port *port)
94{
95 return to_ourport(port)->info->type == PORT_S3C6400;
96}
97
b497549a
BD		 98static void s3c24xx_serial_rx_enable(struct uart_port *port)
99{
100 unsigned long flags;
101 unsigned int ucon, ufcon;
102 int count = 10000;
103
104 spin_lock_irqsave(&port->lock, flags);
105
106 while (--count && !s3c24xx_serial_txempty_nofifo(port))
107 udelay(100);
108
109 ufcon = rd_regl(port, S3C2410_UFCON);
110 ufcon |= S3C2410_UFCON_RESETRX;
111 wr_regl(port, S3C2410_UFCON, ufcon);
112
113 ucon = rd_regl(port, S3C2410_UCON);
114 ucon |= S3C2410_UCON_RXIRQMODE;
115 wr_regl(port, S3C2410_UCON, ucon);
116
117 rx_enabled(port) = 1;
118 spin_unlock_irqrestore(&port->lock, flags);
119}
120
121static void s3c24xx_serial_rx_disable(struct uart_port *port)
122{
123 unsigned long flags;
124 unsigned int ucon;
125
126 spin_lock_irqsave(&port->lock, flags);
127
128 ucon = rd_regl(port, S3C2410_UCON);
129 ucon &= ~S3C2410_UCON_RXIRQMODE;
130 wr_regl(port, S3C2410_UCON, ucon);
131
132 rx_enabled(port) = 0;
133 spin_unlock_irqrestore(&port->lock, flags);
134}
135
136static void s3c24xx_serial_stop_tx(struct uart_port *port)
137{
b73c289c
BD		 138 struct s3c24xx_uart_port *ourport = to_ourport(port);
139
b497549a 140 if (tx_enabled(port)) {
88bb4ea1
TA		 141 if (s3c24xx_serial_has_interrupt_mask(port))
142 __set_bit(S3C64XX_UINTM_TXD,
143 portaddrl(port, S3C64XX_UINTM));
144 else
145 disable_irq_nosync(ourport->tx_irq);
b497549a
BD		 146 tx_enabled(port) = 0;
147 if (port->flags & UPF_CONS_FLOW)
148 s3c24xx_serial_rx_enable(port);
149 }
150}
151
152static void s3c24xx_serial_start_tx(struct uart_port *port)
153{
b73c289c
BD		 154 struct s3c24xx_uart_port *ourport = to_ourport(port);
155
b497549a
BD		 156 if (!tx_enabled(port)) {
157 if (port->flags & UPF_CONS_FLOW)
158 s3c24xx_serial_rx_disable(port);
159
88bb4ea1
TA		 160 if (s3c24xx_serial_has_interrupt_mask(port))
161 __clear_bit(S3C64XX_UINTM_TXD,
162 portaddrl(port, S3C64XX_UINTM));
163 else
164 enable_irq(ourport->tx_irq);
b497549a
BD		 165 tx_enabled(port) = 1;
166 }
167}
168
b497549a
BD		 169static void s3c24xx_serial_stop_rx(struct uart_port *port)
170{
b73c289c
BD		 171 struct s3c24xx_uart_port *ourport = to_ourport(port);
172
b497549a
BD		 173 if (rx_enabled(port)) {
174 dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
88bb4ea1
TA		 175 if (s3c24xx_serial_has_interrupt_mask(port))
176 __set_bit(S3C64XX_UINTM_RXD,
177 portaddrl(port, S3C64XX_UINTM));
178 else
179 disable_irq_nosync(ourport->rx_irq);
b497549a
BD		 180 rx_enabled(port) = 0;
181 }
182}
183
184static void s3c24xx_serial_enable_ms(struct uart_port *port)
185{
186}
187
188static inline struct s3c24xx_uart_info *s3c24xx_port_to_info(struct uart_port *port)
189{
190 return to_ourport(port)->info;
191}
192
193static inline struct s3c2410_uartcfg *s3c24xx_port_to_cfg(struct uart_port *port)
194{
4d84e970
TA		 195 struct s3c24xx_uart_port *ourport;
196
b497549a
BD		 197 if (port->dev == NULL)
198 return NULL;
199
4d84e970
TA		 200 ourport = container_of(port, struct s3c24xx_uart_port, port);
201 return ourport->cfg;
b497549a
BD		 202}
203
204static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
205 unsigned long ufstat)
206{
207 struct s3c24xx_uart_info *info = ourport->info;
208
209 if (ufstat & info->rx_fifofull)
da121506 210 return ourport->port.fifosize;
b497549a
BD		 211
212 return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
213}
214
215
216/* ? - where has parity gone?? */
217#define S3C2410_UERSTAT_PARITY (0x1000)
218
219static irqreturn_t
220s3c24xx_serial_rx_chars(int irq, void *dev_id)
221{
222 struct s3c24xx_uart_port *ourport = dev_id;
223 struct uart_port *port = &ourport->port;
ebd2c8f6 224 struct tty_struct *tty = port->state->port.tty;
b497549a
BD		 225 unsigned int ufcon, ch, flag, ufstat, uerstat;
226 int max_count = 64;
227
228 while (max_count-- > 0) {
229 ufcon = rd_regl(port, S3C2410_UFCON);
230 ufstat = rd_regl(port, S3C2410_UFSTAT);
231
232 if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
233 break;
234
235 uerstat = rd_regl(port, S3C2410_UERSTAT);
236 ch = rd_regb(port, S3C2410_URXH);
237
238 if (port->flags & UPF_CONS_FLOW) {
239 int txe = s3c24xx_serial_txempty_nofifo(port);
240
241 if (rx_enabled(port)) {
242 if (!txe) {
243 rx_enabled(port) = 0;
244 continue;
245 }
246 } else {
247 if (txe) {
248 ufcon |= S3C2410_UFCON_RESETRX;
249 wr_regl(port, S3C2410_UFCON, ufcon);
250 rx_enabled(port) = 1;
251 goto out;
252 }
253 continue;
254 }
255 }
256
257 /* insert the character into the buffer */
258
259 flag = TTY_NORMAL;
260 port->icount.rx++;
261
262 if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) {
263 dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n",
264 ch, uerstat);
265
266 /* check for break */
267 if (uerstat & S3C2410_UERSTAT_BREAK) {
268 dbg("break!\n");
269 port->icount.brk++;
270 if (uart_handle_break(port))
271 goto ignore_char;
272 }
273
274 if (uerstat & S3C2410_UERSTAT_FRAME)
275 port->icount.frame++;
276 if (uerstat & S3C2410_UERSTAT_OVERRUN)
277 port->icount.overrun++;
278
279 uerstat &= port->read_status_mask;
280
281 if (uerstat & S3C2410_UERSTAT_BREAK)
282 flag = TTY_BREAK;
283 else if (uerstat & S3C2410_UERSTAT_PARITY)
284 flag = TTY_PARITY;
285 else if (uerstat & (S3C2410_UERSTAT_FRAME |
286 S3C2410_UERSTAT_OVERRUN))
287 flag = TTY_FRAME;
288 }
289
290 if (uart_handle_sysrq_char(port, ch))
291 goto ignore_char;
292
293 uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN,
294 ch, flag);
295
296 ignore_char:
297 continue;
298 }
299 tty_flip_buffer_push(tty);
300
301 out:
302 return IRQ_HANDLED;
303}
304
305static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
306{
307 struct s3c24xx_uart_port *ourport = id;
308 struct uart_port *port = &ourport->port;
ebd2c8f6 309 struct circ_buf *xmit = &port->state->xmit;
b497549a
BD		 310 int count = 256;
311
312 if (port->x_char) {
313 wr_regb(port, S3C2410_UTXH, port->x_char);
314 port->icount.tx++;
315 port->x_char = 0;
316 goto out;
317 }
318
25985edc 319 /* if there isn't anything more to transmit, or the uart is now
b497549a
BD		 320 * stopped, disable the uart and exit
321 */
322
323 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
324 s3c24xx_serial_stop_tx(port);
325 goto out;
326 }
327
328 /* try and drain the buffer... */
329
330 while (!uart_circ_empty(xmit) && count-- > 0) {
331 if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
332 break;
333
334 wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
335 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
336 port->icount.tx++;
337 }
338
339 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
340 uart_write_wakeup(port);
341
342 if (uart_circ_empty(xmit))
343 s3c24xx_serial_stop_tx(port);
344
345 out:
346 return IRQ_HANDLED;
347}
348
88bb4ea1
TA		 349/* interrupt handler for s3c64xx and later SoC's.*/
350static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id)
351{
352 struct s3c24xx_uart_port *ourport = id;
353 struct uart_port *port = &ourport->port;
354 unsigned int pend = rd_regl(port, S3C64XX_UINTP);
355 unsigned long flags;
356 irqreturn_t ret = IRQ_HANDLED;
357
358 spin_lock_irqsave(&port->lock, flags);
359 if (pend & S3C64XX_UINTM_RXD_MSK) {
360 ret = s3c24xx_serial_rx_chars(irq, id);
361 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_RXD_MSK);
362 }
363 if (pend & S3C64XX_UINTM_TXD_MSK) {
364 ret = s3c24xx_serial_tx_chars(irq, id);
365 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_TXD_MSK);
366 }
367 spin_unlock_irqrestore(&port->lock, flags);
368 return ret;
369}
370
b497549a
BD		 371static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
372{
373 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
374 unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT);
375 unsigned long ufcon = rd_regl(port, S3C2410_UFCON);
376
377 if (ufcon & S3C2410_UFCON_FIFOMODE) {
378 if ((ufstat & info->tx_fifomask) != 0 ||
379 (ufstat & info->tx_fifofull))
380 return 0;
381
382 return 1;
383 }
384
385 return s3c24xx_serial_txempty_nofifo(port);
386}
387
388/* no modem control lines */
389static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
390{
391 unsigned int umstat = rd_regb(port, S3C2410_UMSTAT);
392
393 if (umstat & S3C2410_UMSTAT_CTS)
394 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
395 else
396 return TIOCM_CAR | TIOCM_DSR;
397}
398
399static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
400{
401 /* todo - possibly remove AFC and do manual CTS */
402}
403
404static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
405{
406 unsigned long flags;
407 unsigned int ucon;
408
409 spin_lock_irqsave(&port->lock, flags);
410
411 ucon = rd_regl(port, S3C2410_UCON);
412
413 if (break_state)
414 ucon |= S3C2410_UCON_SBREAK;
415 else
416 ucon &= ~S3C2410_UCON_SBREAK;
417
418 wr_regl(port, S3C2410_UCON, ucon);
419
420 spin_unlock_irqrestore(&port->lock, flags);
421}
422
423static void s3c24xx_serial_shutdown(struct uart_port *port)
424{
425 struct s3c24xx_uart_port *ourport = to_ourport(port);
426
427 if (ourport->tx_claimed) {
88bb4ea1
TA		 428 if (!s3c24xx_serial_has_interrupt_mask(port))
429 free_irq(ourport->tx_irq, ourport);
b497549a
BD		 430 tx_enabled(port) = 0;
431 ourport->tx_claimed = 0;
432 }
433
434 if (ourport->rx_claimed) {
88bb4ea1
TA		 435 if (!s3c24xx_serial_has_interrupt_mask(port))
436 free_irq(ourport->rx_irq, ourport);
b497549a
BD		 437 ourport->rx_claimed = 0;
438 rx_enabled(port) = 0;
439 }
b497549a 440
88bb4ea1
TA		 441 /* Clear pending interrupts and mask all interrupts */
442 if (s3c24xx_serial_has_interrupt_mask(port)) {
443 wr_regl(port, S3C64XX_UINTP, 0xf);
444 wr_regl(port, S3C64XX_UINTM, 0xf);
445 }
446}
b497549a
BD		 447
448static int s3c24xx_serial_startup(struct uart_port *port)
449{
450 struct s3c24xx_uart_port *ourport = to_ourport(port);
451 int ret;
452
453 dbg("s3c24xx_serial_startup: port=%p (%08lx,%p)\n",
454 port->mapbase, port->membase);
455
456 rx_enabled(port) = 1;
457
b73c289c 458 ret = request_irq(ourport->rx_irq, s3c24xx_serial_rx_chars, 0,
b497549a
BD		 459 s3c24xx_serial_portname(port), ourport);
460
461 if (ret != 0) {
b73c289c 462 printk(KERN_ERR "cannot get irq %d\n", ourport->rx_irq);
b497549a
BD		 463 return ret;
464 }
465
466 ourport->rx_claimed = 1;
467
468 dbg("requesting tx irq...\n");
469
470 tx_enabled(port) = 1;
471
b73c289c 472 ret = request_irq(ourport->tx_irq, s3c24xx_serial_tx_chars, 0,
b497549a
BD		 473 s3c24xx_serial_portname(port), ourport);
474
475 if (ret) {
b73c289c 476 printk(KERN_ERR "cannot get irq %d\n", ourport->tx_irq);
b497549a
BD		 477 goto err;
478 }
479
480 ourport->tx_claimed = 1;
481
482 dbg("s3c24xx_serial_startup ok\n");
483
484 /* the port reset code should have done the correct
485 * register setup for the port controls */
486
487 return ret;
488
489 err:
490 s3c24xx_serial_shutdown(port);
491 return ret;
492}
493
88bb4ea1
TA		 494static int s3c64xx_serial_startup(struct uart_port *port)
495{
496 struct s3c24xx_uart_port *ourport = to_ourport(port);
497 int ret;
498
499 dbg("s3c64xx_serial_startup: port=%p (%08lx,%p)\n",
500 port->mapbase, port->membase);
501
502 ret = request_irq(port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED,
503 s3c24xx_serial_portname(port), ourport);
504 if (ret) {
505 printk(KERN_ERR "cannot get irq %d\n", port->irq);
506 return ret;
507 }
508
509 /* For compatibility with s3c24xx Soc's */
510 rx_enabled(port) = 1;
511 ourport->rx_claimed = 1;
512 tx_enabled(port) = 0;
513 ourport->tx_claimed = 1;
514
515 /* Enable Rx Interrupt */
516 __clear_bit(S3C64XX_UINTM_RXD, portaddrl(port, S3C64XX_UINTM));
517 dbg("s3c64xx_serial_startup ok\n");
518 return ret;
519}
520
b497549a
BD		 521/* power power management control */
522
523static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
524 unsigned int old)
525{
526 struct s3c24xx_uart_port *ourport = to_ourport(port);
527
30555476
BD		 528 ourport->pm_level = level;
529
b497549a
BD		 530 switch (level) {
531 case 3:
7cd88831 532 if (!IS_ERR(ourport->baudclk))
b497549a
BD		 533 clk_disable(ourport->baudclk);
534
535 clk_disable(ourport->clk);
536 break;
537
538 case 0:
539 clk_enable(ourport->clk);
540
7cd88831 541 if (!IS_ERR(ourport->baudclk))
b497549a
BD		 542 clk_enable(ourport->baudclk);
543
544 break;
545 default:
546 printk(KERN_ERR "s3c24xx_serial: unknown pm %d\n", level);
547 }
548}
549
550/* baud rate calculation
551 *
552 * The UARTs on the S3C2410/S3C2440 can take their clocks from a number
553 * of different sources, including the peripheral clock ("pclk") and an
554 * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk")
555 * with a programmable extra divisor.
556 *
557 * The following code goes through the clock sources, and calculates the
558 * baud clocks (and the resultant actual baud rates) and then tries to
559 * pick the closest one and select that.
560 *
561*/
562
5f5a7a55 563#define MAX_CLK_NAME_LENGTH 15
b497549a 564
5f5a7a55 565static inline int s3c24xx_serial_getsource(struct uart_port *port)
b497549a
BD		 566{
567 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
5f5a7a55 568 unsigned int ucon;
b497549a 569
5f5a7a55
TA		 570 if (info->num_clks == 1)
571 return 0;
b497549a 572
5f5a7a55
TA		 573 ucon = rd_regl(port, S3C2410_UCON);
574 ucon &= info->clksel_mask;
575 return ucon >> info->clksel_shift;
b497549a
BD		 576}
577
5f5a7a55
TA		 578static void s3c24xx_serial_setsource(struct uart_port *port,
579 unsigned int clk_sel)
b497549a 580{
5f5a7a55
TA		 581 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
582 unsigned int ucon;
b497549a 583
5f5a7a55
TA		 584 if (info->num_clks == 1)
585 return;
090f848d 586
5f5a7a55
TA		 587 ucon = rd_regl(port, S3C2410_UCON);
588 if ((ucon & info->clksel_mask) >> info->clksel_shift == clk_sel)
589 return;
b497549a 590
5f5a7a55
TA		 591 ucon &= ~info->clksel_mask;
592 ucon |= clk_sel << info->clksel_shift;
593 wr_regl(port, S3C2410_UCON, ucon);
b497549a
BD		 594}
595
5f5a7a55
TA		 596static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
597 unsigned int req_baud, struct clk **best_clk,
598 unsigned int *clk_num)
b497549a 599{
5f5a7a55
TA		 600 struct s3c24xx_uart_info *info = ourport->info;
601 struct clk *clk;
602 unsigned long rate;
603 unsigned int cnt, baud, quot, clk_sel, best_quot = 0;
604 char clkname[MAX_CLK_NAME_LENGTH];
605 int calc_deviation, deviation = (1 << 30) - 1;
606
5f5a7a55
TA		 607 clk_sel = (ourport->cfg->clk_sel) ? ourport->cfg->clk_sel :
608 ourport->info->def_clk_sel;
609 for (cnt = 0; cnt < info->num_clks; cnt++) {
610 if (!(clk_sel & (1 << cnt)))
611 continue;
612
613 sprintf(clkname, "clk_uart_baud%d", cnt);
614 clk = clk_get(ourport->port.dev, clkname);
7cd88831 615 if (IS_ERR(clk))
5f5a7a55
TA		 616 continue;
617
618 rate = clk_get_rate(clk);
619 if (!rate)
620 continue;
621
622 if (ourport->info->has_divslot) {
623 unsigned long div = rate / req_baud;
624
625 /* The UDIVSLOT register on the newer UARTs allows us to
626 * get a divisor adjustment of 1/16th on the baud clock.
627 *
628 * We don't keep the UDIVSLOT value (the 16ths we
629 * calculated by not multiplying the baud by 16) as it
630 * is easy enough to recalculate.
631 */
632
633 quot = div / 16;
634 baud = rate / div;
635 } else {
636 quot = (rate + (8 * req_baud)) / (16 * req_baud);
637 baud = rate / (quot * 16);
b497549a 638 }
5f5a7a55 639 quot--;
b497549a 640
5f5a7a55
TA		 641 calc_deviation = req_baud - baud;
642 if (calc_deviation < 0)
643 calc_deviation = -calc_deviation;
b497549a 644
5f5a7a55
TA		 645 if (calc_deviation < deviation) {
646 *best_clk = clk;
647 best_quot = quot;
648 *clk_num = cnt;
649 deviation = calc_deviation;
b497549a
BD		 650 }
651 }
652
5f5a7a55 653 return best_quot;
b497549a
BD		 654}
655
090f848d
BD		 656/* udivslot_table[]
657 *
658 * This table takes the fractional value of the baud divisor and gives
659 * the recommended setting for the UDIVSLOT register.
660 */
661static u16 udivslot_table[16] = {
662 [0] = 0x0000,
663 [1] = 0x0080,
664 [2] = 0x0808,
665 [3] = 0x0888,
666 [4] = 0x2222,
667 [5] = 0x4924,
668 [6] = 0x4A52,
669 [7] = 0x54AA,
670 [8] = 0x5555,
671 [9] = 0xD555,
672 [10] = 0xD5D5,
673 [11] = 0xDDD5,
674 [12] = 0xDDDD,
675 [13] = 0xDFDD,
676 [14] = 0xDFDF,
677 [15] = 0xFFDF,
678};
679
b497549a
BD		 680static void s3c24xx_serial_set_termios(struct uart_port *port,
681 struct ktermios *termios,
682 struct ktermios *old)
683{
684 struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
685 struct s3c24xx_uart_port *ourport = to_ourport(port);
7cd88831 686 struct clk *clk = ERR_PTR(-EINVAL);
b497549a 687 unsigned long flags;
5f5a7a55 688 unsigned int baud, quot, clk_sel = 0;
b497549a
BD		 689 unsigned int ulcon;
690 unsigned int umcon;
090f848d 691 unsigned int udivslot = 0;
b497549a
BD		 692
693 /*
694 * We don't support modem control lines.
695 */
696 termios->c_cflag &= ~(HUPCL | CMSPAR);
697 termios->c_cflag |= CLOCAL;
698
699 /*
700 * Ask the core to calculate the divisor for us.
701 */
702
703 baud = uart_get_baud_rate(port, termios, old, 0, 115200*8);
5f5a7a55 704 quot = s3c24xx_serial_getclk(ourport, baud, &clk, &clk_sel);
b497549a
BD		 705 if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
706 quot = port->custom_divisor;
7cd88831 707 if (IS_ERR(clk))
5f5a7a55 708 return;
b497549a
BD		 709
710 /* check to see if we need to change clock source */
711
5f5a7a55
TA		 712 if (ourport->baudclk != clk) {
713 s3c24xx_serial_setsource(port, clk_sel);
b497549a 714
7cd88831 715 if (!IS_ERR(ourport->baudclk)) {
b497549a 716 clk_disable(ourport->baudclk);
7cd88831 717 ourport->baudclk = ERR_PTR(-EINVAL);
b497549a
BD		 718 }
719
720 clk_enable(clk);
721
b497549a 722 ourport->baudclk = clk;
30555476 723 ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0;
b497549a
BD		 724 }
725
090f848d
BD		 726 if (ourport->info->has_divslot) {
727 unsigned int div = ourport->baudclk_rate / baud;
728
8b526ae4
JL		 729 if (cfg->has_fracval) {
730 udivslot = (div & 15);
731 dbg("fracval = %04x\n", udivslot);
732 } else {
733 udivslot = udivslot_table[div & 15];
734 dbg("udivslot = %04x (div %d)\n", udivslot, div & 15);
735 }
090f848d
BD		 736 }
737
b497549a
BD		 738 switch (termios->c_cflag & CSIZE) {
739 case CS5:
740 dbg("config: 5bits/char\n");
741 ulcon = S3C2410_LCON_CS5;
742 break;
743 case CS6:
744 dbg("config: 6bits/char\n");
745 ulcon = S3C2410_LCON_CS6;
746 break;
747 case CS7:
748 dbg("config: 7bits/char\n");
749 ulcon = S3C2410_LCON_CS7;
750 break;
751 case CS8:
752 default:
753 dbg("config: 8bits/char\n");
754 ulcon = S3C2410_LCON_CS8;
755 break;
756 }
757
758 /* preserve original lcon IR settings */
759 ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
760
761 if (termios->c_cflag & CSTOPB)
762 ulcon |= S3C2410_LCON_STOPB;
763
764 umcon = (termios->c_cflag & CRTSCTS) ? S3C2410_UMCOM_AFC : 0;
765
766 if (termios->c_cflag & PARENB) {
767 if (termios->c_cflag & PARODD)
768 ulcon |= S3C2410_LCON_PODD;
769 else
770 ulcon |= S3C2410_LCON_PEVEN;
771 } else {
772 ulcon |= S3C2410_LCON_PNONE;
773 }
774
775 spin_lock_irqsave(&port->lock, flags);
776
090f848d
BD		 777 dbg("setting ulcon to %08x, brddiv to %d, udivslot %08x\n",
778 ulcon, quot, udivslot);
b497549a
BD		 779
780 wr_regl(port, S3C2410_ULCON, ulcon);
781 wr_regl(port, S3C2410_UBRDIV, quot);
782 wr_regl(port, S3C2410_UMCON, umcon);
783
090f848d
BD		 784 if (ourport->info->has_divslot)
785 wr_regl(port, S3C2443_DIVSLOT, udivslot);
786
b497549a
BD		 787 dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
788 rd_regl(port, S3C2410_ULCON),
789 rd_regl(port, S3C2410_UCON),
790 rd_regl(port, S3C2410_UFCON));
791
792 /*
793 * Update the per-port timeout.
794 */
795 uart_update_timeout(port, termios->c_cflag, baud);
796
797 /*
798 * Which character status flags are we interested in?
799 */
800 port->read_status_mask = S3C2410_UERSTAT_OVERRUN;
801 if (termios->c_iflag & INPCK)
802 port->read_status_mask |= S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_PARITY;
803
804 /*
805 * Which character status flags should we ignore?
806 */
807 port->ignore_status_mask = 0;
808 if (termios->c_iflag & IGNPAR)
809 port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN;
810 if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
811 port->ignore_status_mask |= S3C2410_UERSTAT_FRAME;
812
813 /*
814 * Ignore all characters if CREAD is not set.
815 */
816 if ((termios->c_cflag & CREAD) == 0)
817 port->ignore_status_mask |= RXSTAT_DUMMY_READ;
818
819 spin_unlock_irqrestore(&port->lock, flags);
820}
821
822static const char *s3c24xx_serial_type(struct uart_port *port)
823{
824 switch (port->type) {
825 case PORT_S3C2410:
826 return "S3C2410";
827 case PORT_S3C2440:
828 return "S3C2440";
829 case PORT_S3C2412:
830 return "S3C2412";
b690ace5
BD		 831 case PORT_S3C6400:
832 return "S3C6400/10";
b497549a
BD		 833 default:
834 return NULL;
835 }
836}
837
838#define MAP_SIZE (0x100)
839
840static void s3c24xx_serial_release_port(struct uart_port *port)
841{
842 release_mem_region(port->mapbase, MAP_SIZE);
843}
844
845static int s3c24xx_serial_request_port(struct uart_port *port)
846{
847 const char *name = s3c24xx_serial_portname(port);
848 return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY;
849}
850
851static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
852{
853 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
854
855 if (flags & UART_CONFIG_TYPE &&
856 s3c24xx_serial_request_port(port) == 0)
857 port->type = info->type;
858}
859
860/*
861 * verify the new serial_struct (for TIOCSSERIAL).
862 */
863static int
864s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
865{
866 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
867
868 if (ser->type != PORT_UNKNOWN && ser->type != info->type)
869 return -EINVAL;
870
871 return 0;
872}
873
874
875#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
876
877static struct console s3c24xx_serial_console;
878
879#define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
880#else
881#define S3C24XX_SERIAL_CONSOLE NULL
882#endif
883
884static struct uart_ops s3c24xx_serial_ops = {
885 .pm = s3c24xx_serial_pm,
886 .tx_empty = s3c24xx_serial_tx_empty,
887 .get_mctrl = s3c24xx_serial_get_mctrl,
888 .set_mctrl = s3c24xx_serial_set_mctrl,
889 .stop_tx = s3c24xx_serial_stop_tx,
890 .start_tx = s3c24xx_serial_start_tx,
891 .stop_rx = s3c24xx_serial_stop_rx,
892 .enable_ms = s3c24xx_serial_enable_ms,
893 .break_ctl = s3c24xx_serial_break_ctl,
894 .startup = s3c24xx_serial_startup,
895 .shutdown = s3c24xx_serial_shutdown,
896 .set_termios = s3c24xx_serial_set_termios,
897 .type = s3c24xx_serial_type,
898 .release_port = s3c24xx_serial_release_port,
899 .request_port = s3c24xx_serial_request_port,
900 .config_port = s3c24xx_serial_config_port,
901 .verify_port = s3c24xx_serial_verify_port,
902};
903
b497549a
BD		 904static struct uart_driver s3c24xx_uart_drv = {
905 .owner = THIS_MODULE,
2cf0c58e 906 .driver_name = "s3c2410_serial",
bdd4915a 907 .nr = CONFIG_SERIAL_SAMSUNG_UARTS,
b497549a 908 .cons = S3C24XX_SERIAL_CONSOLE,
2cf0c58e 909 .dev_name = S3C24XX_SERIAL_NAME,
b497549a
BD		 910 .major = S3C24XX_SERIAL_MAJOR,
911 .minor = S3C24XX_SERIAL_MINOR,
912};
913
03d5e77b 914static struct s3c24xx_uart_port s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = {
b497549a
BD		 915 [0] = {
916 .port = {
917 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[0].port.lock),
918 .iotype = UPIO_MEM,
b497549a
BD		 919 .uartclk = 0,
920 .fifosize = 16,
921 .ops = &s3c24xx_serial_ops,
922 .flags = UPF_BOOT_AUTOCONF,
923 .line = 0,
924 }
925 },
926 [1] = {
927 .port = {
928 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[1].port.lock),
929 .iotype = UPIO_MEM,
b497549a
BD		 930 .uartclk = 0,
931 .fifosize = 16,
932 .ops = &s3c24xx_serial_ops,
933 .flags = UPF_BOOT_AUTOCONF,
934 .line = 1,
935 }
936 },
03d5e77b 937#if CONFIG_SERIAL_SAMSUNG_UARTS > 2
b497549a
BD		 938
939 [2] = {
940 .port = {
941 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[2].port.lock),
942 .iotype = UPIO_MEM,
b497549a
BD		 943 .uartclk = 0,
944 .fifosize = 16,
945 .ops = &s3c24xx_serial_ops,
946 .flags = UPF_BOOT_AUTOCONF,
947 .line = 2,
948 }
03d5e77b
BD		 949 },
950#endif
951#if CONFIG_SERIAL_SAMSUNG_UARTS > 3
952 [3] = {
953 .port = {
954 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[3].port.lock),
955 .iotype = UPIO_MEM,
03d5e77b
BD		 956 .uartclk = 0,
957 .fifosize = 16,
958 .ops = &s3c24xx_serial_ops,
959 .flags = UPF_BOOT_AUTOCONF,
960 .line = 3,
961 }
b497549a
BD		 962 }
963#endif
964};
965
966/* s3c24xx_serial_resetport
967 *
0dfb3b41 968 * reset the fifos and other the settings.
b497549a
BD		 969*/
970
0dfb3b41
TA		 971static void s3c24xx_serial_resetport(struct uart_port *port,
972 struct s3c2410_uartcfg *cfg)
b497549a
BD		 973{
974 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
0dfb3b41
TA		 975 unsigned long ucon = rd_regl(port, S3C2410_UCON);
976 unsigned int ucon_mask;
b497549a 977
0dfb3b41
TA		 978 ucon_mask = info->clksel_mask;
979 if (info->type == PORT_S3C2440)
980 ucon_mask |= S3C2440_UCON0_DIVMASK;
981
982 ucon &= ucon_mask;
983 wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
7b246a1d 984 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
0dfb3b41
TA		 985
986 /* reset both fifos */
987 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
988 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
989
990 /* some delay is required after fifo reset */
991 udelay(1);
b497549a
BD		 992}
993
30555476
BD		 994
995#ifdef CONFIG_CPU_FREQ
996
997static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb,
998 unsigned long val, void *data)
999{
1000 struct s3c24xx_uart_port *port;
1001 struct uart_port *uport;
1002
1003 port = container_of(nb, struct s3c24xx_uart_port, freq_transition);
1004 uport = &port->port;
1005
1006 /* check to see if port is enabled */
1007
1008 if (port->pm_level != 0)
1009 return 0;
1010
1011 /* try and work out if the baudrate is changing, we can detect
1012 * a change in rate, but we do not have support for detecting
1013 * a disturbance in the clock-rate over the change.
1014 */
1015
1016 if (IS_ERR(port->clk))
1017 goto exit;
1018
1019 if (port->baudclk_rate == clk_get_rate(port->clk))
1020 goto exit;
1021
1022 if (val == CPUFREQ_PRECHANGE) {
1023 /* we should really shut the port down whilst the
1024 * frequency change is in progress. */
1025
1026 } else if (val == CPUFREQ_POSTCHANGE) {
1027 struct ktermios *termios;
1028 struct tty_struct *tty;
1029
ebd2c8f6 1030 if (uport->state == NULL)
30555476 1031 goto exit;
30555476 1032
ebd2c8f6 1033 tty = uport->state->port.tty;
30555476 1034
7de40c21 1035 if (tty == NULL)
30555476 1036 goto exit;
30555476
BD		 1037
1038 termios = tty->termios;
1039
1040 if (termios == NULL) {
1041 printk(KERN_WARNING "%s: no termios?\n", __func__);
1042 goto exit;
1043 }
1044
1045 s3c24xx_serial_set_termios(uport, termios, NULL);
1046 }
1047
1048 exit:
1049 return 0;
1050}
1051
1052static inline int s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1053{
1054 port->freq_transition.notifier_call = s3c24xx_serial_cpufreq_transition;
1055
1056 return cpufreq_register_notifier(&port->freq_transition,
1057 CPUFREQ_TRANSITION_NOTIFIER);
1058}
1059
1060static inline void s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1061{
1062 cpufreq_unregister_notifier(&port->freq_transition,
1063 CPUFREQ_TRANSITION_NOTIFIER);
1064}
1065
1066#else
1067static inline int s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1068{
1069 return 0;
1070}
1071
1072static inline void s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1073{
1074}
1075#endif
1076
b497549a
BD		 1077/* s3c24xx_serial_init_port
1078 *
1079 * initialise a single serial port from the platform device given
1080 */
1081
1082static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
b497549a
BD		 1083 struct platform_device *platdev)
1084{
1085 struct uart_port *port = &ourport->port;
da121506 1086 struct s3c2410_uartcfg *cfg = ourport->cfg;
b497549a
BD		 1087 struct resource *res;
1088 int ret;
1089
1090 dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev);
1091
1092 if (platdev == NULL)
1093 return -ENODEV;
1094
b497549a
BD		 1095 if (port->mapbase != 0)
1096 return 0;
1097
b497549a
BD		 1098 /* setup info for port */
1099 port->dev = &platdev->dev;
b497549a 1100
88bb4ea1
TA		 1101 /* Startup sequence is different for s3c64xx and higher SoC's */
1102 if (s3c24xx_serial_has_interrupt_mask(port))
1103 s3c24xx_serial_ops.startup = s3c64xx_serial_startup;
1104
b497549a
BD		 1105 port->uartclk = 1;
1106
1107 if (cfg->uart_flags & UPF_CONS_FLOW) {
1108 dbg("s3c24xx_serial_init_port: enabling flow control\n");
1109 port->flags |= UPF_CONS_FLOW;
1110 }
1111
1112 /* sort our the physical and virtual addresses for each UART */
1113
1114 res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
1115 if (res == NULL) {
1116 printk(KERN_ERR "failed to find memory resource for uart\n");
1117 return -EINVAL;
1118 }
1119
1120 dbg("resource %p (%lx..%lx)\n", res, res->start, res->end);
1121
b690ace5 1122 port->mapbase = res->start;
2555e663 1123 port->membase = S3C_VA_UART + (res->start & 0xfffff);
b497549a
BD		 1124 ret = platform_get_irq(platdev, 0);
1125 if (ret < 0)
1126 port->irq = 0;
b73c289c 1127 else {
b497549a 1128 port->irq = ret;
b73c289c
BD		 1129 ourport->rx_irq = ret;
1130 ourport->tx_irq = ret + 1;
1131 }
1132
1133 ret = platform_get_irq(platdev, 1);
1134 if (ret > 0)
1135 ourport->tx_irq = ret;
b497549a
BD		 1136
1137 ourport->clk = clk_get(&platdev->dev, "uart");
1138
88bb4ea1
TA		 1139 /* Keep all interrupts masked and cleared */
1140 if (s3c24xx_serial_has_interrupt_mask(port)) {
1141 wr_regl(port, S3C64XX_UINTM, 0xf);
1142 wr_regl(port, S3C64XX_UINTP, 0xf);
1143 wr_regl(port, S3C64XX_UINTSP, 0xf);
1144 }
1145
b73c289c
BD		 1146 dbg("port: map=%08x, mem=%08x, irq=%d (%d,%d), clock=%ld\n",
1147 port->mapbase, port->membase, port->irq,
1148 ourport->rx_irq, ourport->tx_irq, port->uartclk);
b497549a
BD		 1149
1150 /* reset the fifos (and setup the uart) */
1151 s3c24xx_serial_resetport(port, cfg);
1152 return 0;
1153}
1154
1155static ssize_t s3c24xx_serial_show_clksrc(struct device *dev,
1156 struct device_attribute *attr,
1157 char *buf)
1158{
1159 struct uart_port *port = s3c24xx_dev_to_port(dev);
1160 struct s3c24xx_uart_port *ourport = to_ourport(port);
1161
7cd88831
KK		 1162 if (IS_ERR(ourport->baudclk))
1163 return -EINVAL;
1164
5f5a7a55 1165 return snprintf(buf, PAGE_SIZE, "* %s\n", ourport->baudclk->name);
b497549a
BD		 1166}
1167
1168static DEVICE_ATTR(clock_source, S_IRUGO, s3c24xx_serial_show_clksrc, NULL);
1169
26c919e1 1170
b497549a
BD		 1171/* Device driver serial port probe */
1172
26c919e1 1173static const struct of_device_id s3c24xx_uart_dt_match[];
b497549a
BD		 1174static int probe_index;
1175
26c919e1
TA		 1176static inline struct s3c24xx_serial_drv_data *s3c24xx_get_driver_data(
1177 struct platform_device *pdev)
1178{
1179#ifdef CONFIG_OF
1180 if (pdev->dev.of_node) {
1181 const struct of_device_id *match;
1182 match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node);
1183 return (struct s3c24xx_serial_drv_data *)match->data;
1184 }
1185#endif
1186 return (struct s3c24xx_serial_drv_data *)
1187 platform_get_device_id(pdev)->driver_data;
1188}
1189
da121506 1190static int s3c24xx_serial_probe(struct platform_device *pdev)
b497549a
BD		 1191{
1192 struct s3c24xx_uart_port *ourport;
1193 int ret;
1194
da121506 1195 dbg("s3c24xx_serial_probe(%p) %d\n", pdev, probe_index);
b497549a
BD		 1196
1197 ourport = &s3c24xx_serial_ports[probe_index];
da121506 1198
26c919e1
TA		 1199 ourport->drv_data = s3c24xx_get_driver_data(pdev);
1200 if (!ourport->drv_data) {
1201 dev_err(&pdev->dev, "could not find driver data\n");
1202 return -ENODEV;
1203 }
da121506 1204
7cd88831 1205 ourport->baudclk = ERR_PTR(-EINVAL);
da121506
TA		 1206 ourport->info = ourport->drv_data->info;
1207 ourport->cfg = (pdev->dev.platform_data) ?
1208 (struct s3c2410_uartcfg *)pdev->dev.platform_data :
1209 ourport->drv_data->def_cfg;
1210
1211 ourport->port.fifosize = (ourport->info->fifosize) ?
1212 ourport->info->fifosize :
1213 ourport->drv_data->fifosize[probe_index];
1214
b497549a
BD		 1215 probe_index++;
1216
1217 dbg("%s: initialising port %p...\n", __func__, ourport);
1218
da121506 1219 ret = s3c24xx_serial_init_port(ourport, pdev);
b497549a
BD		 1220 if (ret < 0)
1221 goto probe_err;
1222
1223 dbg("%s: adding port\n", __func__);
1224 uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
da121506 1225 platform_set_drvdata(pdev, &ourport->port);
b497549a 1226
da121506 1227 ret = device_create_file(&pdev->dev, &dev_attr_clock_source);
b497549a 1228 if (ret < 0)
da121506 1229 dev_err(&pdev->dev, "failed to add clock source attr.\n");
b497549a 1230
30555476
BD		 1231 ret = s3c24xx_serial_cpufreq_register(ourport);
1232 if (ret < 0)
da121506 1233 dev_err(&pdev->dev, "failed to add cpufreq notifier\n");
30555476 1234
b497549a
BD		 1235 return 0;
1236
1237 probe_err:
1238 return ret;
1239}
1240
da121506 1241static int __devexit s3c24xx_serial_remove(struct platform_device *dev)
b497549a
BD		 1242{
1243 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1244
1245 if (port) {
30555476 1246 s3c24xx_serial_cpufreq_deregister(to_ourport(port));
b497549a
BD		 1247 device_remove_file(&dev->dev, &dev_attr_clock_source);
1248 uart_remove_one_port(&s3c24xx_uart_drv, port);
1249 }
1250
1251 return 0;
1252}
1253
b497549a 1254/* UART power management code */
aef7fe52
MH		 1255#ifdef CONFIG_PM_SLEEP
1256static int s3c24xx_serial_suspend(struct device *dev)
b497549a 1257{
aef7fe52 1258 struct uart_port *port = s3c24xx_dev_to_port(dev);
b497549a
BD		 1259
1260 if (port)
1261 uart_suspend_port(&s3c24xx_uart_drv, port);
1262
1263 return 0;
1264}
1265
aef7fe52 1266static int s3c24xx_serial_resume(struct device *dev)
b497549a 1267{
aef7fe52 1268 struct uart_port *port = s3c24xx_dev_to_port(dev);
b497549a
BD		 1269 struct s3c24xx_uart_port *ourport = to_ourport(port);
1270
1271 if (port) {
1272 clk_enable(ourport->clk);
1273 s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
1274 clk_disable(ourport->clk);
1275
1276 uart_resume_port(&s3c24xx_uart_drv, port);
1277 }
1278
1279 return 0;
1280}
aef7fe52
MH		 1281
1282static const struct dev_pm_ops s3c24xx_serial_pm_ops = {
1283 .suspend = s3c24xx_serial_suspend,
1284 .resume = s3c24xx_serial_resume,
1285};
b882fc1b
KK		 1286#define SERIAL_SAMSUNG_PM_OPS (&s3c24xx_serial_pm_ops)
1287
aef7fe52 1288#else /* !CONFIG_PM_SLEEP */
b882fc1b
KK		 1289
1290#define SERIAL_SAMSUNG_PM_OPS NULL
aef7fe52 1291#endif /* CONFIG_PM_SLEEP */
b497549a 1292
b497549a
BD		 1293/* Console code */
1294
1295#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
1296
1297static struct uart_port *cons_uart;
1298
1299static int
1300s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
1301{
1302 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1303 unsigned long ufstat, utrstat;
1304
1305 if (ufcon & S3C2410_UFCON_FIFOMODE) {
9ddc5b6f 1306 /* fifo mode - check amount of data in fifo registers... */
b497549a
BD		 1307
1308 ufstat = rd_regl(port, S3C2410_UFSTAT);
1309 return (ufstat & info->tx_fifofull) ? 0 : 1;
1310 }
1311
1312 /* in non-fifo mode, we go and use the tx buffer empty */
1313
1314 utrstat = rd_regl(port, S3C2410_UTRSTAT);
1315 return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
1316}
1317
1318static void
1319s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
1320{
1321 unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON);
1322 while (!s3c24xx_serial_console_txrdy(port, ufcon))
1323 barrier();
1324 wr_regb(cons_uart, S3C2410_UTXH, ch);
1325}
1326
1327static void
1328s3c24xx_serial_console_write(struct console *co, const char *s,
1329 unsigned int count)
1330{
1331 uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
1332}
1333
1334static void __init
1335s3c24xx_serial_get_options(struct uart_port *port, int *baud,
1336 int *parity, int *bits)
1337{
b497549a
BD		 1338 struct clk *clk;
1339 unsigned int ulcon;
1340 unsigned int ucon;
1341 unsigned int ubrdiv;
1342 unsigned long rate;
5f5a7a55
TA		 1343 unsigned int clk_sel;
1344 char clk_name[MAX_CLK_NAME_LENGTH];
b497549a
BD		 1345
1346 ulcon = rd_regl(port, S3C2410_ULCON);
1347 ucon = rd_regl(port, S3C2410_UCON);
1348 ubrdiv = rd_regl(port, S3C2410_UBRDIV);
1349
1350 dbg("s3c24xx_serial_get_options: port=%p\n"
1351 "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
1352 port, ulcon, ucon, ubrdiv);
1353
1354 if ((ucon & 0xf) != 0) {
1355 /* consider the serial port configured if the tx/rx mode set */
1356
1357 switch (ulcon & S3C2410_LCON_CSMASK) {
1358 case S3C2410_LCON_CS5:
1359 *bits = 5;
1360 break;
1361 case S3C2410_LCON_CS6:
1362 *bits = 6;
1363 break;
1364 case S3C2410_LCON_CS7:
1365 *bits = 7;
1366 break;
1367 default:
1368 case S3C2410_LCON_CS8:
1369 *bits = 8;
1370 break;
1371 }
1372
1373 switch (ulcon & S3C2410_LCON_PMASK) {
1374 case S3C2410_LCON_PEVEN:
1375 *parity = 'e';
1376 break;
1377
1378 case S3C2410_LCON_PODD:
1379 *parity = 'o';
1380 break;
1381
1382 case S3C2410_LCON_PNONE:
1383 default:
1384 *parity = 'n';
1385 }
1386
1387 /* now calculate the baud rate */
1388
5f5a7a55
TA		 1389 clk_sel = s3c24xx_serial_getsource(port);
1390 sprintf(clk_name, "clk_uart_baud%d", clk_sel);
b497549a 1391
5f5a7a55 1392 clk = clk_get(port->dev, clk_name);
7cd88831 1393 if (!IS_ERR(clk))
5f5a7a55 1394 rate = clk_get_rate(clk);
b497549a
BD		 1395 else
1396 rate = 1;
1397
b497549a
BD		 1398 *baud = rate / (16 * (ubrdiv + 1));
1399 dbg("calculated baud %d\n", *baud);
1400 }
1401
1402}
1403
b497549a
BD		 1404static int __init
1405s3c24xx_serial_console_setup(struct console *co, char *options)
1406{
1407 struct uart_port *port;
1408 int baud = 9600;
1409 int bits = 8;
1410 int parity = 'n';
1411 int flow = 'n';
1412
1413 dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n",
1414 co, co->index, options);
1415
1416 /* is this a valid port */
1417
03d5e77b 1418 if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS)
b497549a
BD		 1419 co->index = 0;
1420
1421 port = &s3c24xx_serial_ports[co->index].port;
1422
1423 /* is the port configured? */
1424
ee430f16
TA		 1425 if (port->mapbase == 0x0)
1426 return -ENODEV;
b497549a
BD		 1427
1428 cons_uart = port;
1429
1430 dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index);
1431
1432 /*
1433 * Check whether an invalid uart number has been specified, and
1434 * if so, search for the first available port that does have
1435 * console support.
1436 */
1437 if (options)
1438 uart_parse_options(options, &baud, &parity, &bits, &flow);
1439 else
1440 s3c24xx_serial_get_options(port, &baud, &parity, &bits);
1441
1442 dbg("s3c24xx_serial_console_setup: baud %d\n", baud);
1443
1444 return uart_set_options(port, co, baud, parity, bits, flow);
1445}
1446
b497549a
BD		 1447static struct console s3c24xx_serial_console = {
1448 .name = S3C24XX_SERIAL_NAME,
1449 .device = uart_console_device,
1450 .flags = CON_PRINTBUFFER,
1451 .index = -1,
1452 .write = s3c24xx_serial_console_write,
5822a5df
TA		 1453 .setup = s3c24xx_serial_console_setup,
1454 .data = &s3c24xx_uart_drv,
b497549a 1455};
da121506
TA		 1456#endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */
1457
1458#ifdef CONFIG_CPU_S3C2410
1459static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = {
1460 .info = &(struct s3c24xx_uart_info) {
1461 .name = "Samsung S3C2410 UART",
1462 .type = PORT_S3C2410,
1463 .fifosize = 16,
1464 .rx_fifomask = S3C2410_UFSTAT_RXMASK,
1465 .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
1466 .rx_fifofull = S3C2410_UFSTAT_RXFULL,
1467 .tx_fifofull = S3C2410_UFSTAT_TXFULL,
1468 .tx_fifomask = S3C2410_UFSTAT_TXMASK,
1469 .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
1470 .def_clk_sel = S3C2410_UCON_CLKSEL0,
1471 .num_clks = 2,
1472 .clksel_mask = S3C2410_UCON_CLKMASK,
1473 .clksel_shift = S3C2410_UCON_CLKSHIFT,
1474 },
1475 .def_cfg = &(struct s3c2410_uartcfg) {
1476 .ucon = S3C2410_UCON_DEFAULT,
1477 .ufcon = S3C2410_UFCON_DEFAULT,
1478 },
1479};
1480#define S3C2410_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2410_serial_drv_data)
1481#else
1482#define S3C2410_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1483#endif
b497549a 1484
da121506
TA		 1485#ifdef CONFIG_CPU_S3C2412
1486static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = {
1487 .info = &(struct s3c24xx_uart_info) {
1488 .name = "Samsung S3C2412 UART",
1489 .type = PORT_S3C2412,
1490 .fifosize = 64,
1491 .has_divslot = 1,
1492 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1493 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1494 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1495 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1496 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1497 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1498 .def_clk_sel = S3C2410_UCON_CLKSEL2,
1499 .num_clks = 4,
1500 .clksel_mask = S3C2412_UCON_CLKMASK,
1501 .clksel_shift = S3C2412_UCON_CLKSHIFT,
1502 },
1503 .def_cfg = &(struct s3c2410_uartcfg) {
1504 .ucon = S3C2410_UCON_DEFAULT,
1505 .ufcon = S3C2410_UFCON_DEFAULT,
1506 },
1507};
1508#define S3C2412_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2412_serial_drv_data)
1509#else
1510#define S3C2412_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1511#endif
b497549a 1512
da121506 1513#if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2416) || \
b26469a8 1514 defined(CONFIG_CPU_S3C2443) || defined(CONFIG_CPU_S3C2442)
da121506
TA		 1515static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
1516 .info = &(struct s3c24xx_uart_info) {
1517 .name = "Samsung S3C2440 UART",
1518 .type = PORT_S3C2440,
1519 .fifosize = 64,
1520 .has_divslot = 1,
1521 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1522 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1523 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1524 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1525 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1526 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1527 .def_clk_sel = S3C2410_UCON_CLKSEL2,
1528 .num_clks = 4,
1529 .clksel_mask = S3C2412_UCON_CLKMASK,
1530 .clksel_shift = S3C2412_UCON_CLKSHIFT,
1531 },
1532 .def_cfg = &(struct s3c2410_uartcfg) {
1533 .ucon = S3C2410_UCON_DEFAULT,
1534 .ufcon = S3C2410_UFCON_DEFAULT,
1535 },
1536};
1537#define S3C2440_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2440_serial_drv_data)
1538#else
1539#define S3C2440_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1540#endif
b497549a 1541
da121506
TA		 1542#if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410) || \
1543 defined(CONFIG_CPU_S5P6440) || defined(CONFIG_CPU_S5P6450) || \
1544 defined(CONFIG_CPU_S5PC100)
1545static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
1546 .info = &(struct s3c24xx_uart_info) {
1547 .name = "Samsung S3C6400 UART",
1548 .type = PORT_S3C6400,
1549 .fifosize = 64,
1550 .has_divslot = 1,
1551 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1552 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1553 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1554 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1555 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1556 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1557 .def_clk_sel = S3C2410_UCON_CLKSEL2,
1558 .num_clks = 4,
1559 .clksel_mask = S3C6400_UCON_CLKMASK,
1560 .clksel_shift = S3C6400_UCON_CLKSHIFT,
1561 },
1562 .def_cfg = &(struct s3c2410_uartcfg) {
1563 .ucon = S3C2410_UCON_DEFAULT,
1564 .ufcon = S3C2410_UFCON_DEFAULT,
1565 },
1566};
1567#define S3C6400_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c6400_serial_drv_data)
1568#else
1569#define S3C6400_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1570#endif
b497549a 1571
da121506
TA		 1572#ifdef CONFIG_CPU_S5PV210
1573static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
1574 .info = &(struct s3c24xx_uart_info) {
1575 .name = "Samsung S5PV210 UART",
1576 .type = PORT_S3C6400,
1577 .has_divslot = 1,
1578 .rx_fifomask = S5PV210_UFSTAT_RXMASK,
1579 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT,
1580 .rx_fifofull = S5PV210_UFSTAT_RXFULL,
1581 .tx_fifofull = S5PV210_UFSTAT_TXFULL,
1582 .tx_fifomask = S5PV210_UFSTAT_TXMASK,
1583 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT,
1584 .def_clk_sel = S3C2410_UCON_CLKSEL0,
1585 .num_clks = 2,
1586 .clksel_mask = S5PV210_UCON_CLKMASK,
1587 .clksel_shift = S5PV210_UCON_CLKSHIFT,
1588 },
1589 .def_cfg = &(struct s3c2410_uartcfg) {
1590 .ucon = S5PV210_UCON_DEFAULT,
1591 .ufcon = S5PV210_UFCON_DEFAULT,
1592 },
1593 .fifosize = { 256, 64, 16, 16 },
1594};
1595#define S5PV210_SERIAL_DRV_DATA ((kernel_ulong_t)&s5pv210_serial_drv_data)
1596#else
1597#define S5PV210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1598#endif
b497549a 1599
5f7b6d19 1600#if defined(CONFIG_CPU_EXYNOS4210) || defined(CONFIG_SOC_EXYNOS4212) || \
7ccfe015 1601 defined(CONFIG_SOC_EXYNOS4412) || defined(CONFIG_SOC_EXYNOS5250)
da121506
TA		 1602static struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = {
1603 .info = &(struct s3c24xx_uart_info) {
1604 .name = "Samsung Exynos4 UART",
1605 .type = PORT_S3C6400,
1606 .has_divslot = 1,
1607 .rx_fifomask = S5PV210_UFSTAT_RXMASK,
1608 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT,
1609 .rx_fifofull = S5PV210_UFSTAT_RXFULL,
1610 .tx_fifofull = S5PV210_UFSTAT_TXFULL,
1611 .tx_fifomask = S5PV210_UFSTAT_TXMASK,
1612 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT,
1613 .def_clk_sel = S3C2410_UCON_CLKSEL0,
1614 .num_clks = 1,
1615 .clksel_mask = 0,
1616 .clksel_shift = 0,
1617 },
1618 .def_cfg = &(struct s3c2410_uartcfg) {
1619 .ucon = S5PV210_UCON_DEFAULT,
1620 .ufcon = S5PV210_UFCON_DEFAULT,
1621 .has_fracval = 1,
1622 },
1623 .fifosize = { 256, 64, 16, 16 },
1624};
1625#define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos4210_serial_drv_data)
1626#else
1627#define EXYNOS4210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1628#endif
b497549a 1629
da121506
TA		 1630static struct platform_device_id s3c24xx_serial_driver_ids[] = {
1631 {
1632 .name = "s3c2410-uart",
1633 .driver_data = S3C2410_SERIAL_DRV_DATA,
1634 }, {
1635 .name = "s3c2412-uart",
1636 .driver_data = S3C2412_SERIAL_DRV_DATA,
1637 }, {
1638 .name = "s3c2440-uart",
1639 .driver_data = S3C2440_SERIAL_DRV_DATA,
1640 }, {
1641 .name = "s3c6400-uart",
1642 .driver_data = S3C6400_SERIAL_DRV_DATA,
1643 }, {
1644 .name = "s5pv210-uart",
1645 .driver_data = S5PV210_SERIAL_DRV_DATA,
1646 }, {
1647 .name = "exynos4210-uart",
1648 .driver_data = EXYNOS4210_SERIAL_DRV_DATA,
1649 },
1650 { },
1651};
1652MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids);
1653
26c919e1
TA		 1654#ifdef CONFIG_OF
1655static const struct of_device_id s3c24xx_uart_dt_match[] = {
1656 { .compatible = "samsung,exynos4210-uart",
a169a888 1657 .data = (void *)EXYNOS4210_SERIAL_DRV_DATA },
26c919e1
TA		 1658 {},
1659};
1660MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match);
1661#else
1662#define s3c24xx_uart_dt_match NULL
1663#endif
1664
da121506
TA		 1665static struct platform_driver samsung_serial_driver = {
1666 .probe = s3c24xx_serial_probe,
1667 .remove = __devexit_p(s3c24xx_serial_remove),
1668 .id_table = s3c24xx_serial_driver_ids,
1669 .driver = {
1670 .name = "samsung-uart",
1671 .owner = THIS_MODULE,
1672 .pm = SERIAL_SAMSUNG_PM_OPS,
26c919e1 1673 .of_match_table = s3c24xx_uart_dt_match,
da121506
TA		 1674 },
1675};
b497549a 1676
da121506 1677/* module initialisation code */
b497549a 1678
da121506
TA		 1679static int __init s3c24xx_serial_modinit(void)
1680{
1681 int ret;
1682
1683 ret = uart_register_driver(&s3c24xx_uart_drv);
1684 if (ret < 0) {
1685 printk(KERN_ERR "failed to register UART driver\n");
1686 return -1;
1687 }
1688
1689 return platform_driver_register(&samsung_serial_driver);
b497549a
BD		 1690}
1691
da121506
TA		 1692static void __exit s3c24xx_serial_modexit(void)
1693{
1694 uart_unregister_driver(&s3c24xx_uart_drv);
1695}
1696
1697module_init(s3c24xx_serial_modinit);
1698module_exit(s3c24xx_serial_modexit);
b497549a 1699
da121506 1700MODULE_ALIAS("platform:samsung-uart");
b497549a
BD		 1701MODULE_DESCRIPTION("Samsung SoC Serial port driver");
1702MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
1703MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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