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tty: revert incorrectly applied lock patch
[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>
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
25f04ad4 1016 if (IS_ERR(port->baudclk))
30555476
BD		 1017 goto exit;
1018
25f04ad4 1019 if (port->baudclk_rate == clk_get_rate(port->baudclk))
30555476
BD		 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
7b15e1d9
KP		 1165 return snprintf(buf, PAGE_SIZE, "* %s\n",
1166 ourport->baudclk->name ?: "(null)");
b497549a
BD		 1167}
1168
1169static DEVICE_ATTR(clock_source, S_IRUGO, s3c24xx_serial_show_clksrc, NULL);
1170
26c919e1 1171
b497549a
BD		 1172/* Device driver serial port probe */
1173
26c919e1 1174static const struct of_device_id s3c24xx_uart_dt_match[];
b497549a
BD		 1175static int probe_index;
1176
26c919e1
TA		 1177static inline struct s3c24xx_serial_drv_data *s3c24xx_get_driver_data(
1178 struct platform_device *pdev)
1179{
1180#ifdef CONFIG_OF
1181 if (pdev->dev.of_node) {
1182 const struct of_device_id *match;
1183 match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node);
1184 return (struct s3c24xx_serial_drv_data *)match->data;
1185 }
1186#endif
1187 return (struct s3c24xx_serial_drv_data *)
1188 platform_get_device_id(pdev)->driver_data;
1189}
1190
da121506 1191static int s3c24xx_serial_probe(struct platform_device *pdev)
b497549a
BD		 1192{
1193 struct s3c24xx_uart_port *ourport;
1194 int ret;
1195
da121506 1196 dbg("s3c24xx_serial_probe(%p) %d\n", pdev, probe_index);
b497549a
BD		 1197
1198 ourport = &s3c24xx_serial_ports[probe_index];
da121506 1199
26c919e1
TA		 1200 ourport->drv_data = s3c24xx_get_driver_data(pdev);
1201 if (!ourport->drv_data) {
1202 dev_err(&pdev->dev, "could not find driver data\n");
1203 return -ENODEV;
1204 }
da121506 1205
7cd88831 1206 ourport->baudclk = ERR_PTR(-EINVAL);
da121506
TA		 1207 ourport->info = ourport->drv_data->info;
1208 ourport->cfg = (pdev->dev.platform_data) ?
1209 (struct s3c2410_uartcfg *)pdev->dev.platform_data :
1210 ourport->drv_data->def_cfg;
1211
1212 ourport->port.fifosize = (ourport->info->fifosize) ?
1213 ourport->info->fifosize :
1214 ourport->drv_data->fifosize[probe_index];
1215
b497549a
BD		 1216 probe_index++;
1217
1218 dbg("%s: initialising port %p...\n", __func__, ourport);
1219
da121506 1220 ret = s3c24xx_serial_init_port(ourport, pdev);
b497549a
BD		 1221 if (ret < 0)
1222 goto probe_err;
1223
1224 dbg("%s: adding port\n", __func__);
1225 uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
da121506 1226 platform_set_drvdata(pdev, &ourport->port);
b497549a 1227
da121506 1228 ret = device_create_file(&pdev->dev, &dev_attr_clock_source);
b497549a 1229 if (ret < 0)
da121506 1230 dev_err(&pdev->dev, "failed to add clock source attr.\n");
b497549a 1231
30555476
BD		 1232 ret = s3c24xx_serial_cpufreq_register(ourport);
1233 if (ret < 0)
da121506 1234 dev_err(&pdev->dev, "failed to add cpufreq notifier\n");
30555476 1235
b497549a
BD		 1236 return 0;
1237
1238 probe_err:
1239 return ret;
1240}
1241
da121506 1242static int __devexit s3c24xx_serial_remove(struct platform_device *dev)
b497549a
BD		 1243{
1244 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1245
1246 if (port) {
30555476 1247 s3c24xx_serial_cpufreq_deregister(to_ourport(port));
b497549a
BD		 1248 device_remove_file(&dev->dev, &dev_attr_clock_source);
1249 uart_remove_one_port(&s3c24xx_uart_drv, port);
1250 }
1251
1252 return 0;
1253}
1254
b497549a 1255/* UART power management code */
aef7fe52
MH		 1256#ifdef CONFIG_PM_SLEEP
1257static int s3c24xx_serial_suspend(struct device *dev)
b497549a 1258{
aef7fe52 1259 struct uart_port *port = s3c24xx_dev_to_port(dev);
b497549a
BD		 1260
1261 if (port)
1262 uart_suspend_port(&s3c24xx_uart_drv, port);
1263
1264 return 0;
1265}
1266
aef7fe52 1267static int s3c24xx_serial_resume(struct device *dev)
b497549a 1268{
aef7fe52 1269 struct uart_port *port = s3c24xx_dev_to_port(dev);
b497549a
BD		 1270 struct s3c24xx_uart_port *ourport = to_ourport(port);
1271
1272 if (port) {
1273 clk_enable(ourport->clk);
1274 s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
1275 clk_disable(ourport->clk);
1276
1277 uart_resume_port(&s3c24xx_uart_drv, port);
1278 }
1279
1280 return 0;
1281}
aef7fe52
MH		 1282
1283static const struct dev_pm_ops s3c24xx_serial_pm_ops = {
1284 .suspend = s3c24xx_serial_suspend,
1285 .resume = s3c24xx_serial_resume,
1286};
b882fc1b
KK		 1287#define SERIAL_SAMSUNG_PM_OPS (&s3c24xx_serial_pm_ops)
1288
aef7fe52 1289#else /* !CONFIG_PM_SLEEP */
b882fc1b
KK		 1290
1291#define SERIAL_SAMSUNG_PM_OPS NULL
aef7fe52 1292#endif /* CONFIG_PM_SLEEP */
b497549a 1293
b497549a
BD		 1294/* Console code */
1295
1296#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
1297
1298static struct uart_port *cons_uart;
1299
1300static int
1301s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
1302{
1303 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1304 unsigned long ufstat, utrstat;
1305
1306 if (ufcon & S3C2410_UFCON_FIFOMODE) {
9ddc5b6f 1307 /* fifo mode - check amount of data in fifo registers... */
b497549a
BD		 1308
1309 ufstat = rd_regl(port, S3C2410_UFSTAT);
1310 return (ufstat & info->tx_fifofull) ? 0 : 1;
1311 }
1312
1313 /* in non-fifo mode, we go and use the tx buffer empty */
1314
1315 utrstat = rd_regl(port, S3C2410_UTRSTAT);
1316 return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
1317}
1318
1319static void
1320s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
1321{
1322 unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON);
1323 while (!s3c24xx_serial_console_txrdy(port, ufcon))
1324 barrier();
1325 wr_regb(cons_uart, S3C2410_UTXH, ch);
1326}
1327
1328static void
1329s3c24xx_serial_console_write(struct console *co, const char *s,
1330 unsigned int count)
1331{
1332 uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
1333}
1334
1335static void __init
1336s3c24xx_serial_get_options(struct uart_port *port, int *baud,
1337 int *parity, int *bits)
1338{
b497549a
BD		 1339 struct clk *clk;
1340 unsigned int ulcon;
1341 unsigned int ucon;
1342 unsigned int ubrdiv;
1343 unsigned long rate;
5f5a7a55
TA		 1344 unsigned int clk_sel;
1345 char clk_name[MAX_CLK_NAME_LENGTH];
b497549a
BD		 1346
1347 ulcon = rd_regl(port, S3C2410_ULCON);
1348 ucon = rd_regl(port, S3C2410_UCON);
1349 ubrdiv = rd_regl(port, S3C2410_UBRDIV);
1350
1351 dbg("s3c24xx_serial_get_options: port=%p\n"
1352 "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
1353 port, ulcon, ucon, ubrdiv);
1354
1355 if ((ucon & 0xf) != 0) {
1356 /* consider the serial port configured if the tx/rx mode set */
1357
1358 switch (ulcon & S3C2410_LCON_CSMASK) {
1359 case S3C2410_LCON_CS5:
1360 *bits = 5;
1361 break;
1362 case S3C2410_LCON_CS6:
1363 *bits = 6;
1364 break;
1365 case S3C2410_LCON_CS7:
1366 *bits = 7;
1367 break;
1368 default:
1369 case S3C2410_LCON_CS8:
1370 *bits = 8;
1371 break;
1372 }
1373
1374 switch (ulcon & S3C2410_LCON_PMASK) {
1375 case S3C2410_LCON_PEVEN:
1376 *parity = 'e';
1377 break;
1378
1379 case S3C2410_LCON_PODD:
1380 *parity = 'o';
1381 break;
1382
1383 case S3C2410_LCON_PNONE:
1384 default:
1385 *parity = 'n';
1386 }
1387
1388 /* now calculate the baud rate */
1389
5f5a7a55
TA		 1390 clk_sel = s3c24xx_serial_getsource(port);
1391 sprintf(clk_name, "clk_uart_baud%d", clk_sel);
b497549a 1392
5f5a7a55 1393 clk = clk_get(port->dev, clk_name);
7cd88831 1394 if (!IS_ERR(clk))
5f5a7a55 1395 rate = clk_get_rate(clk);
b497549a
BD		 1396 else
1397 rate = 1;
1398
b497549a
BD		 1399 *baud = rate / (16 * (ubrdiv + 1));
1400 dbg("calculated baud %d\n", *baud);
1401 }
1402
1403}
1404
b497549a
BD		 1405static int __init
1406s3c24xx_serial_console_setup(struct console *co, char *options)
1407{
1408 struct uart_port *port;
1409 int baud = 9600;
1410 int bits = 8;
1411 int parity = 'n';
1412 int flow = 'n';
1413
1414 dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n",
1415 co, co->index, options);
1416
1417 /* is this a valid port */
1418
03d5e77b 1419 if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS)
b497549a
BD		 1420 co->index = 0;
1421
1422 port = &s3c24xx_serial_ports[co->index].port;
1423
1424 /* is the port configured? */
1425
ee430f16
TA		 1426 if (port->mapbase == 0x0)
1427 return -ENODEV;
b497549a
BD		 1428
1429 cons_uart = port;
1430
1431 dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index);
1432
1433 /*
1434 * Check whether an invalid uart number has been specified, and
1435 * if so, search for the first available port that does have
1436 * console support.
1437 */
1438 if (options)
1439 uart_parse_options(options, &baud, &parity, &bits, &flow);
1440 else
1441 s3c24xx_serial_get_options(port, &baud, &parity, &bits);
1442
1443 dbg("s3c24xx_serial_console_setup: baud %d\n", baud);
1444
1445 return uart_set_options(port, co, baud, parity, bits, flow);
1446}
1447
b497549a
BD		 1448static struct console s3c24xx_serial_console = {
1449 .name = S3C24XX_SERIAL_NAME,
1450 .device = uart_console_device,
1451 .flags = CON_PRINTBUFFER,
1452 .index = -1,
1453 .write = s3c24xx_serial_console_write,
5822a5df
TA		 1454 .setup = s3c24xx_serial_console_setup,
1455 .data = &s3c24xx_uart_drv,
b497549a 1456};
da121506
TA		 1457#endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */
1458
1459#ifdef CONFIG_CPU_S3C2410
1460static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = {
1461 .info = &(struct s3c24xx_uart_info) {
1462 .name = "Samsung S3C2410 UART",
1463 .type = PORT_S3C2410,
1464 .fifosize = 16,
1465 .rx_fifomask = S3C2410_UFSTAT_RXMASK,
1466 .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
1467 .rx_fifofull = S3C2410_UFSTAT_RXFULL,
1468 .tx_fifofull = S3C2410_UFSTAT_TXFULL,
1469 .tx_fifomask = S3C2410_UFSTAT_TXMASK,
1470 .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
1471 .def_clk_sel = S3C2410_UCON_CLKSEL0,
1472 .num_clks = 2,
1473 .clksel_mask = S3C2410_UCON_CLKMASK,
1474 .clksel_shift = S3C2410_UCON_CLKSHIFT,
1475 },
1476 .def_cfg = &(struct s3c2410_uartcfg) {
1477 .ucon = S3C2410_UCON_DEFAULT,
1478 .ufcon = S3C2410_UFCON_DEFAULT,
1479 },
1480};
1481#define S3C2410_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2410_serial_drv_data)
1482#else
1483#define S3C2410_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1484#endif
b497549a 1485
da121506
TA		 1486#ifdef CONFIG_CPU_S3C2412
1487static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = {
1488 .info = &(struct s3c24xx_uart_info) {
1489 .name = "Samsung S3C2412 UART",
1490 .type = PORT_S3C2412,
1491 .fifosize = 64,
1492 .has_divslot = 1,
1493 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1494 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1495 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1496 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1497 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1498 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1499 .def_clk_sel = S3C2410_UCON_CLKSEL2,
1500 .num_clks = 4,
1501 .clksel_mask = S3C2412_UCON_CLKMASK,
1502 .clksel_shift = S3C2412_UCON_CLKSHIFT,
1503 },
1504 .def_cfg = &(struct s3c2410_uartcfg) {
1505 .ucon = S3C2410_UCON_DEFAULT,
1506 .ufcon = S3C2410_UFCON_DEFAULT,
1507 },
1508};
1509#define S3C2412_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2412_serial_drv_data)
1510#else
1511#define S3C2412_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1512#endif
b497549a 1513
da121506 1514#if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2416) || \
b26469a8 1515 defined(CONFIG_CPU_S3C2443) || defined(CONFIG_CPU_S3C2442)
da121506
TA		 1516static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
1517 .info = &(struct s3c24xx_uart_info) {
1518 .name = "Samsung S3C2440 UART",
1519 .type = PORT_S3C2440,
1520 .fifosize = 64,
1521 .has_divslot = 1,
1522 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1523 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1524 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1525 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1526 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1527 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1528 .def_clk_sel = S3C2410_UCON_CLKSEL2,
1529 .num_clks = 4,
1530 .clksel_mask = S3C2412_UCON_CLKMASK,
1531 .clksel_shift = S3C2412_UCON_CLKSHIFT,
1532 },
1533 .def_cfg = &(struct s3c2410_uartcfg) {
1534 .ucon = S3C2410_UCON_DEFAULT,
1535 .ufcon = S3C2410_UFCON_DEFAULT,
1536 },
1537};
1538#define S3C2440_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2440_serial_drv_data)
1539#else
1540#define S3C2440_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1541#endif
b497549a 1542
da121506
TA		 1543#if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410) || \
1544 defined(CONFIG_CPU_S5P6440) || defined(CONFIG_CPU_S5P6450) || \
1545 defined(CONFIG_CPU_S5PC100)
1546static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
1547 .info = &(struct s3c24xx_uart_info) {
1548 .name = "Samsung S3C6400 UART",
1549 .type = PORT_S3C6400,
1550 .fifosize = 64,
1551 .has_divslot = 1,
1552 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1553 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1554 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1555 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1556 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1557 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1558 .def_clk_sel = S3C2410_UCON_CLKSEL2,
1559 .num_clks = 4,
1560 .clksel_mask = S3C6400_UCON_CLKMASK,
1561 .clksel_shift = S3C6400_UCON_CLKSHIFT,
1562 },
1563 .def_cfg = &(struct s3c2410_uartcfg) {
1564 .ucon = S3C2410_UCON_DEFAULT,
1565 .ufcon = S3C2410_UFCON_DEFAULT,
1566 },
1567};
1568#define S3C6400_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c6400_serial_drv_data)
1569#else
1570#define S3C6400_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1571#endif
b497549a 1572
da121506
TA		 1573#ifdef CONFIG_CPU_S5PV210
1574static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
1575 .info = &(struct s3c24xx_uart_info) {
1576 .name = "Samsung S5PV210 UART",
1577 .type = PORT_S3C6400,
1578 .has_divslot = 1,
1579 .rx_fifomask = S5PV210_UFSTAT_RXMASK,
1580 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT,
1581 .rx_fifofull = S5PV210_UFSTAT_RXFULL,
1582 .tx_fifofull = S5PV210_UFSTAT_TXFULL,
1583 .tx_fifomask = S5PV210_UFSTAT_TXMASK,
1584 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT,
1585 .def_clk_sel = S3C2410_UCON_CLKSEL0,
1586 .num_clks = 2,
1587 .clksel_mask = S5PV210_UCON_CLKMASK,
1588 .clksel_shift = S5PV210_UCON_CLKSHIFT,
1589 },
1590 .def_cfg = &(struct s3c2410_uartcfg) {
1591 .ucon = S5PV210_UCON_DEFAULT,
1592 .ufcon = S5PV210_UFCON_DEFAULT,
1593 },
1594 .fifosize = { 256, 64, 16, 16 },
1595};
1596#define S5PV210_SERIAL_DRV_DATA ((kernel_ulong_t)&s5pv210_serial_drv_data)
1597#else
1598#define S5PV210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1599#endif
b497549a 1600
5f7b6d19 1601#if defined(CONFIG_CPU_EXYNOS4210) || defined(CONFIG_SOC_EXYNOS4212) || \
7ccfe015 1602 defined(CONFIG_SOC_EXYNOS4412) || defined(CONFIG_SOC_EXYNOS5250)
da121506
TA		 1603static struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = {
1604 .info = &(struct s3c24xx_uart_info) {
1605 .name = "Samsung Exynos4 UART",
1606 .type = PORT_S3C6400,
1607 .has_divslot = 1,
1608 .rx_fifomask = S5PV210_UFSTAT_RXMASK,
1609 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT,
1610 .rx_fifofull = S5PV210_UFSTAT_RXFULL,
1611 .tx_fifofull = S5PV210_UFSTAT_TXFULL,
1612 .tx_fifomask = S5PV210_UFSTAT_TXMASK,
1613 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT,
1614 .def_clk_sel = S3C2410_UCON_CLKSEL0,
1615 .num_clks = 1,
1616 .clksel_mask = 0,
1617 .clksel_shift = 0,
1618 },
1619 .def_cfg = &(struct s3c2410_uartcfg) {
1620 .ucon = S5PV210_UCON_DEFAULT,
1621 .ufcon = S5PV210_UFCON_DEFAULT,
1622 .has_fracval = 1,
1623 },
1624 .fifosize = { 256, 64, 16, 16 },
1625};
1626#define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos4210_serial_drv_data)
1627#else
1628#define EXYNOS4210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1629#endif
b497549a 1630
da121506
TA		 1631static struct platform_device_id s3c24xx_serial_driver_ids[] = {
1632 {
1633 .name = "s3c2410-uart",
1634 .driver_data = S3C2410_SERIAL_DRV_DATA,
1635 }, {
1636 .name = "s3c2412-uart",
1637 .driver_data = S3C2412_SERIAL_DRV_DATA,
1638 }, {
1639 .name = "s3c2440-uart",
1640 .driver_data = S3C2440_SERIAL_DRV_DATA,
1641 }, {
1642 .name = "s3c6400-uart",
1643 .driver_data = S3C6400_SERIAL_DRV_DATA,
1644 }, {
1645 .name = "s5pv210-uart",
1646 .driver_data = S5PV210_SERIAL_DRV_DATA,
1647 }, {
1648 .name = "exynos4210-uart",
1649 .driver_data = EXYNOS4210_SERIAL_DRV_DATA,
1650 },
1651 { },
1652};
1653MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids);
1654
26c919e1
TA		 1655#ifdef CONFIG_OF
1656static const struct of_device_id s3c24xx_uart_dt_match[] = {
1657 { .compatible = "samsung,exynos4210-uart",
a169a888 1658 .data = (void *)EXYNOS4210_SERIAL_DRV_DATA },
26c919e1
TA		 1659 {},
1660};
1661MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match);
1662#else
1663#define s3c24xx_uart_dt_match NULL
1664#endif
1665
da121506
TA		 1666static struct platform_driver samsung_serial_driver = {
1667 .probe = s3c24xx_serial_probe,
1668 .remove = __devexit_p(s3c24xx_serial_remove),
1669 .id_table = s3c24xx_serial_driver_ids,
1670 .driver = {
1671 .name = "samsung-uart",
1672 .owner = THIS_MODULE,
1673 .pm = SERIAL_SAMSUNG_PM_OPS,
26c919e1 1674 .of_match_table = s3c24xx_uart_dt_match,
da121506
TA		 1675 },
1676};
b497549a 1677
da121506 1678/* module initialisation code */
b497549a 1679
da121506
TA		 1680static int __init s3c24xx_serial_modinit(void)
1681{
1682 int ret;
1683
1684 ret = uart_register_driver(&s3c24xx_uart_drv);
1685 if (ret < 0) {
1686 printk(KERN_ERR "failed to register UART driver\n");
1687 return -1;
1688 }
1689
1690 return platform_driver_register(&samsung_serial_driver);
b497549a
BD		 1691}
1692
da121506
TA		 1693static void __exit s3c24xx_serial_modexit(void)
1694{
1695 uart_unregister_driver(&s3c24xx_uart_drv);
1696}
1697
1698module_init(s3c24xx_serial_modinit);
1699module_exit(s3c24xx_serial_modexit);
b497549a 1700
da121506 1701MODULE_ALIAS("platform:samsung-uart");
b497549a
BD		 1702MODULE_DESCRIPTION("Samsung SoC Serial port driver");
1703MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
1704MODULE_LICENSE("GPL v2");
Linux 6.x block layer and io_uring tree(s)