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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
[linux/fpc-iii.git] / drivers / tty / serial / samsung.c
blob9cd706df3b3351cbfa10fa14c254b36724601cc1
1 /*
2 * Driver core for Samsung SoC onboard UARTs.
3 *
4 * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics
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/serial_s3c.h>
43 #include <linux/delay.h>
44 #include <linux/clk.h>
45 #include <linux/cpufreq.h>
46 #include <linux/of.h>
47
48 #include <asm/irq.h>
49
50 #ifdef CONFIG_SAMSUNG_CLOCK
51 #include <plat/clock.h>
52 #endif
53
54 #include "samsung.h"
55
56 /* UART name and device definitions */
57
58 #define S3C24XX_SERIAL_NAME "ttySAC"
59 #define S3C24XX_SERIAL_MAJOR 204
60 #define S3C24XX_SERIAL_MINOR 64
61
62 /* macros to change one thing to another */
63
64 #define tx_enabled(port) ((port)->unused[0])
65 #define rx_enabled(port) ((port)->unused[1])
66
67 /* flag to ignore all characters coming in */
68 #define RXSTAT_DUMMY_READ (0x10000000)
69
70 static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port)
71 {
72 return container_of(port, struct s3c24xx_uart_port, port);
73 }
74
75 /* translate a port to the device name */
76
77 static inline const char *s3c24xx_serial_portname(struct uart_port *port)
78 {
79 return to_platform_device(port->dev)->name;
80 }
81
82 static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
83 {
84 return rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE;
85 }
86
87 /*
88 * s3c64xx and later SoC's include the interrupt mask and status registers in
89 * the controller itself, unlike the s3c24xx SoC's which have these registers
90 * in the interrupt controller. Check if the port type is s3c64xx or higher.
91 */
92 static int s3c24xx_serial_has_interrupt_mask(struct uart_port *port)
93 {
94 return to_ourport(port)->info->type == PORT_S3C6400;
95 }
96
97 static void s3c24xx_serial_rx_enable(struct uart_port *port)
98 {
99 unsigned long flags;
100 unsigned int ucon, ufcon;
101 int count = 10000;
102
103 spin_lock_irqsave(&port->lock, flags);
104
105 while (--count && !s3c24xx_serial_txempty_nofifo(port))
106 udelay(100);
107
108 ufcon = rd_regl(port, S3C2410_UFCON);
109 ufcon |= S3C2410_UFCON_RESETRX;
110 wr_regl(port, S3C2410_UFCON, ufcon);
111
112 ucon = rd_regl(port, S3C2410_UCON);
113 ucon |= S3C2410_UCON_RXIRQMODE;
114 wr_regl(port, S3C2410_UCON, ucon);
115
116 rx_enabled(port) = 1;
117 spin_unlock_irqrestore(&port->lock, flags);
118 }
119
120 static void s3c24xx_serial_rx_disable(struct uart_port *port)
121 {
122 unsigned long flags;
123 unsigned int ucon;
124
125 spin_lock_irqsave(&port->lock, flags);
126
127 ucon = rd_regl(port, S3C2410_UCON);
128 ucon &= ~S3C2410_UCON_RXIRQMODE;
129 wr_regl(port, S3C2410_UCON, ucon);
130
131 rx_enabled(port) = 0;
132 spin_unlock_irqrestore(&port->lock, flags);
133 }
134
135 static void s3c24xx_serial_stop_tx(struct uart_port *port)
136 {
137 struct s3c24xx_uart_port *ourport = to_ourport(port);
138
139 if (tx_enabled(port)) {
140 if (s3c24xx_serial_has_interrupt_mask(port))
141 __set_bit(S3C64XX_UINTM_TXD,
142 portaddrl(port, S3C64XX_UINTM));
143 else
144 disable_irq_nosync(ourport->tx_irq);
145 tx_enabled(port) = 0;
146 if (port->flags & UPF_CONS_FLOW)
147 s3c24xx_serial_rx_enable(port);
148 }
149 }
150
151 static void s3c24xx_serial_start_tx(struct uart_port *port)
152 {
153 struct s3c24xx_uart_port *ourport = to_ourport(port);
154
155 if (!tx_enabled(port)) {
156 if (port->flags & UPF_CONS_FLOW)
157 s3c24xx_serial_rx_disable(port);
158
159 if (s3c24xx_serial_has_interrupt_mask(port))
160 __clear_bit(S3C64XX_UINTM_TXD,
161 portaddrl(port, S3C64XX_UINTM));
162 else
163 enable_irq(ourport->tx_irq);
164 tx_enabled(port) = 1;
165 }
166 }
167
168 static void s3c24xx_serial_stop_rx(struct uart_port *port)
169 {
170 struct s3c24xx_uart_port *ourport = to_ourport(port);
171
172 if (rx_enabled(port)) {
173 dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
174 if (s3c24xx_serial_has_interrupt_mask(port))
175 __set_bit(S3C64XX_UINTM_RXD,
176 portaddrl(port, S3C64XX_UINTM));
177 else
178 disable_irq_nosync(ourport->rx_irq);
179 rx_enabled(port) = 0;
180 }
181 }
182
183 static void s3c24xx_serial_enable_ms(struct uart_port *port)
184 {
185 }
186
187 static inline struct s3c24xx_uart_info *s3c24xx_port_to_info(struct uart_port *port)
188 {
189 return to_ourport(port)->info;
190 }
191
192 static inline struct s3c2410_uartcfg *s3c24xx_port_to_cfg(struct uart_port *port)
193 {
194 struct s3c24xx_uart_port *ourport;
195
196 if (port->dev == NULL)
197 return NULL;
198
199 ourport = container_of(port, struct s3c24xx_uart_port, port);
200 return ourport->cfg;
201 }
202
203 static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
204 unsigned long ufstat)
205 {
206 struct s3c24xx_uart_info *info = ourport->info;
207
208 if (ufstat & info->rx_fifofull)
209 return ourport->port.fifosize;
210
211 return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
212 }
213
214
215 /* ? - where has parity gone?? */
216 #define S3C2410_UERSTAT_PARITY (0x1000)
217
218 static irqreturn_t
219 s3c24xx_serial_rx_chars(int irq, void *dev_id)
220 {
221 struct s3c24xx_uart_port *ourport = dev_id;
222 struct uart_port *port = &ourport->port;
223 unsigned int ufcon, ch, flag, ufstat, uerstat;
224 unsigned long flags;
225 int max_count = 64;
226
227 spin_lock_irqsave(&port->lock, flags);
228
229 while (max_count-- > 0) {
230 ufcon = rd_regl(port, S3C2410_UFCON);
231 ufstat = rd_regl(port, S3C2410_UFSTAT);
232
233 if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
234 break;
235
236 uerstat = rd_regl(port, S3C2410_UERSTAT);
237 ch = rd_regb(port, S3C2410_URXH);
238
239 if (port->flags & UPF_CONS_FLOW) {
240 int txe = s3c24xx_serial_txempty_nofifo(port);
241
242 if (rx_enabled(port)) {
243 if (!txe) {
244 rx_enabled(port) = 0;
245 continue;
246 }
247 } else {
248 if (txe) {
249 ufcon |= S3C2410_UFCON_RESETRX;
250 wr_regl(port, S3C2410_UFCON, ufcon);
251 rx_enabled(port) = 1;
252 spin_unlock_irqrestore(&port->lock,
253 flags);
254 goto out;
255 }
256 continue;
257 }
258 }
259
260 /* insert the character into the buffer */
261
262 flag = TTY_NORMAL;
263 port->icount.rx++;
264
265 if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) {
266 dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n",
267 ch, uerstat);
268
269 /* check for break */
270 if (uerstat & S3C2410_UERSTAT_BREAK) {
271 dbg("break!\n");
272 port->icount.brk++;
273 if (uart_handle_break(port))
274 goto ignore_char;
275 }
276
277 if (uerstat & S3C2410_UERSTAT_FRAME)
278 port->icount.frame++;
279 if (uerstat & S3C2410_UERSTAT_OVERRUN)
280 port->icount.overrun++;
281
282 uerstat &= port->read_status_mask;
283
284 if (uerstat & S3C2410_UERSTAT_BREAK)
285 flag = TTY_BREAK;
286 else if (uerstat & S3C2410_UERSTAT_PARITY)
287 flag = TTY_PARITY;
288 else if (uerstat & (S3C2410_UERSTAT_FRAME |
289 S3C2410_UERSTAT_OVERRUN))
290 flag = TTY_FRAME;
291 }
292
293 if (uart_handle_sysrq_char(port, ch))
294 goto ignore_char;
295
296 uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN,
297 ch, flag);
298
299 ignore_char:
300 continue;
301 }
302
303 spin_unlock_irqrestore(&port->lock, flags);
304 tty_flip_buffer_push(&port->state->port);
305
306 out:
307 return IRQ_HANDLED;
308 }
309
310 static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
311 {
312 struct s3c24xx_uart_port *ourport = id;
313 struct uart_port *port = &ourport->port;
314 struct circ_buf *xmit = &port->state->xmit;
315 unsigned long flags;
316 int count = 256;
317
318 spin_lock_irqsave(&port->lock, flags);
319
320 if (port->x_char) {
321 wr_regb(port, S3C2410_UTXH, port->x_char);
322 port->icount.tx++;
323 port->x_char = 0;
324 goto out;
325 }
326
327 /* if there isn't anything more to transmit, or the uart is now
328 * stopped, disable the uart and exit
329 */
330
331 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
332 s3c24xx_serial_stop_tx(port);
333 goto out;
334 }
335
336 /* try and drain the buffer... */
337
338 while (!uart_circ_empty(xmit) && count-- > 0) {
339 if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
340 break;
341
342 wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
343 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
344 port->icount.tx++;
345 }
346
347 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
348 spin_unlock(&port->lock);
349 uart_write_wakeup(port);
350 spin_lock(&port->lock);
351 }
352
353 if (uart_circ_empty(xmit))
354 s3c24xx_serial_stop_tx(port);
355
356 out:
357 spin_unlock_irqrestore(&port->lock, flags);
358 return IRQ_HANDLED;
359 }
360
361 /* interrupt handler for s3c64xx and later SoC's.*/
362 static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id)
363 {
364 struct s3c24xx_uart_port *ourport = id;
365 struct uart_port *port = &ourport->port;
366 unsigned int pend = rd_regl(port, S3C64XX_UINTP);
367 irqreturn_t ret = IRQ_HANDLED;
368
369 if (pend & S3C64XX_UINTM_RXD_MSK) {
370 ret = s3c24xx_serial_rx_chars(irq, id);
371 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_RXD_MSK);
372 }
373 if (pend & S3C64XX_UINTM_TXD_MSK) {
374 ret = s3c24xx_serial_tx_chars(irq, id);
375 wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_TXD_MSK);
376 }
377 return ret;
378 }
379
380 static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
381 {
382 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
383 unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT);
384 unsigned long ufcon = rd_regl(port, S3C2410_UFCON);
385
386 if (ufcon & S3C2410_UFCON_FIFOMODE) {
387 if ((ufstat & info->tx_fifomask) != 0 ||
388 (ufstat & info->tx_fifofull))
389 return 0;
390
391 return 1;
392 }
393
394 return s3c24xx_serial_txempty_nofifo(port);
395 }
396
397 /* no modem control lines */
398 static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
399 {
400 unsigned int umstat = rd_regb(port, S3C2410_UMSTAT);
401
402 if (umstat & S3C2410_UMSTAT_CTS)
403 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
404 else
405 return TIOCM_CAR | TIOCM_DSR;
406 }
407
408 static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
409 {
410 unsigned int umcon = rd_regl(port, S3C2410_UMCON);
411
412 if (mctrl & TIOCM_RTS)
413 umcon |= S3C2410_UMCOM_RTS_LOW;
414 else
415 umcon &= ~S3C2410_UMCOM_RTS_LOW;
416
417 wr_regl(port, S3C2410_UMCON, umcon);
418 }
419
420 static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
421 {
422 unsigned long flags;
423 unsigned int ucon;
424
425 spin_lock_irqsave(&port->lock, flags);
426
427 ucon = rd_regl(port, S3C2410_UCON);
428
429 if (break_state)
430 ucon |= S3C2410_UCON_SBREAK;
431 else
432 ucon &= ~S3C2410_UCON_SBREAK;
433
434 wr_regl(port, S3C2410_UCON, ucon);
435
436 spin_unlock_irqrestore(&port->lock, flags);
437 }
438
439 static void s3c24xx_serial_shutdown(struct uart_port *port)
440 {
441 struct s3c24xx_uart_port *ourport = to_ourport(port);
442
443 if (ourport->tx_claimed) {
444 if (!s3c24xx_serial_has_interrupt_mask(port))
445 free_irq(ourport->tx_irq, ourport);
446 tx_enabled(port) = 0;
447 ourport->tx_claimed = 0;
448 }
449
450 if (ourport->rx_claimed) {
451 if (!s3c24xx_serial_has_interrupt_mask(port))
452 free_irq(ourport->rx_irq, ourport);
453 ourport->rx_claimed = 0;
454 rx_enabled(port) = 0;
455 }
456
457 /* Clear pending interrupts and mask all interrupts */
458 if (s3c24xx_serial_has_interrupt_mask(port)) {
459 free_irq(port->irq, ourport);
460
461 wr_regl(port, S3C64XX_UINTP, 0xf);
462 wr_regl(port, S3C64XX_UINTM, 0xf);
463 }
464 }
465
466 static int s3c24xx_serial_startup(struct uart_port *port)
467 {
468 struct s3c24xx_uart_port *ourport = to_ourport(port);
469 int ret;
470
471 dbg("s3c24xx_serial_startup: port=%p (%08lx,%p)\n",
472 port->mapbase, port->membase);
473
474 rx_enabled(port) = 1;
475
476 ret = request_irq(ourport->rx_irq, s3c24xx_serial_rx_chars, 0,
477 s3c24xx_serial_portname(port), ourport);
478
479 if (ret != 0) {
480 dev_err(port->dev, "cannot get irq %d\n", ourport->rx_irq);
481 return ret;
482 }
483
484 ourport->rx_claimed = 1;
485
486 dbg("requesting tx irq...\n");
487
488 tx_enabled(port) = 1;
489
490 ret = request_irq(ourport->tx_irq, s3c24xx_serial_tx_chars, 0,
491 s3c24xx_serial_portname(port), ourport);
492
493 if (ret) {
494 dev_err(port->dev, "cannot get irq %d\n", ourport->tx_irq);
495 goto err;
496 }
497
498 ourport->tx_claimed = 1;
499
500 dbg("s3c24xx_serial_startup ok\n");
501
502 /* the port reset code should have done the correct
503 * register setup for the port controls */
504
505 return ret;
506
507 err:
508 s3c24xx_serial_shutdown(port);
509 return ret;
510 }
511
512 static int s3c64xx_serial_startup(struct uart_port *port)
513 {
514 struct s3c24xx_uart_port *ourport = to_ourport(port);
515 int ret;
516
517 dbg("s3c64xx_serial_startup: port=%p (%08lx,%p)\n",
518 port->mapbase, port->membase);
519
520 wr_regl(port, S3C64XX_UINTM, 0xf);
521
522 ret = request_irq(port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED,
523 s3c24xx_serial_portname(port), ourport);
524 if (ret) {
525 dev_err(port->dev, "cannot get irq %d\n", port->irq);
526 return ret;
527 }
528
529 /* For compatibility with s3c24xx Soc's */
530 rx_enabled(port) = 1;
531 ourport->rx_claimed = 1;
532 tx_enabled(port) = 0;
533 ourport->tx_claimed = 1;
534
535 /* Enable Rx Interrupt */
536 __clear_bit(S3C64XX_UINTM_RXD, portaddrl(port, S3C64XX_UINTM));
537 dbg("s3c64xx_serial_startup ok\n");
538 return ret;
539 }
540
541 /* power power management control */
542
543 static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
544 unsigned int old)
545 {
546 struct s3c24xx_uart_port *ourport = to_ourport(port);
547
548 ourport->pm_level = level;
549
550 switch (level) {
551 case 3:
552 if (!IS_ERR(ourport->baudclk))
553 clk_disable_unprepare(ourport->baudclk);
554
555 clk_disable_unprepare(ourport->clk);
556 break;
557
558 case 0:
559 clk_prepare_enable(ourport->clk);
560
561 if (!IS_ERR(ourport->baudclk))
562 clk_prepare_enable(ourport->baudclk);
563
564 break;
565 default:
566 dev_err(port->dev, "s3c24xx_serial: unknown pm %d\n", level);
567 }
568 }
569
570 /* baud rate calculation
571 *
572 * The UARTs on the S3C2410/S3C2440 can take their clocks from a number
573 * of different sources, including the peripheral clock ("pclk") and an
574 * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk")
575 * with a programmable extra divisor.
576 *
577 * The following code goes through the clock sources, and calculates the
578 * baud clocks (and the resultant actual baud rates) and then tries to
579 * pick the closest one and select that.
580 *
581 */
582
583 #define MAX_CLK_NAME_LENGTH 15
584
585 static inline int s3c24xx_serial_getsource(struct uart_port *port)
586 {
587 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
588 unsigned int ucon;
589
590 if (info->num_clks == 1)
591 return 0;
592
593 ucon = rd_regl(port, S3C2410_UCON);
594 ucon &= info->clksel_mask;
595 return ucon >> info->clksel_shift;
596 }
597
598 static void s3c24xx_serial_setsource(struct uart_port *port,
599 unsigned int clk_sel)
600 {
601 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
602 unsigned int ucon;
603
604 if (info->num_clks == 1)
605 return;
606
607 ucon = rd_regl(port, S3C2410_UCON);
608 if ((ucon & info->clksel_mask) >> info->clksel_shift == clk_sel)
609 return;
610
611 ucon &= ~info->clksel_mask;
612 ucon |= clk_sel << info->clksel_shift;
613 wr_regl(port, S3C2410_UCON, ucon);
614 }
615
616 static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
617 unsigned int req_baud, struct clk **best_clk,
618 unsigned int *clk_num)
619 {
620 struct s3c24xx_uart_info *info = ourport->info;
621 struct clk *clk;
622 unsigned long rate;
623 unsigned int cnt, baud, quot, clk_sel, best_quot = 0;
624 char clkname[MAX_CLK_NAME_LENGTH];
625 int calc_deviation, deviation = (1 << 30) - 1;
626
627 clk_sel = (ourport->cfg->clk_sel) ? ourport->cfg->clk_sel :
628 ourport->info->def_clk_sel;
629 for (cnt = 0; cnt < info->num_clks; cnt++) {
630 if (!(clk_sel & (1 << cnt)))
631 continue;
632
633 sprintf(clkname, "clk_uart_baud%d", cnt);
634 clk = clk_get(ourport->port.dev, clkname);
635 if (IS_ERR(clk))
636 continue;
637
638 rate = clk_get_rate(clk);
639 if (!rate)
640 continue;
641
642 if (ourport->info->has_divslot) {
643 unsigned long div = rate / req_baud;
644
645 /* The UDIVSLOT register on the newer UARTs allows us to
646 * get a divisor adjustment of 1/16th on the baud clock.
647 *
648 * We don't keep the UDIVSLOT value (the 16ths we
649 * calculated by not multiplying the baud by 16) as it
650 * is easy enough to recalculate.
651 */
652
653 quot = div / 16;
654 baud = rate / div;
655 } else {
656 quot = (rate + (8 * req_baud)) / (16 * req_baud);
657 baud = rate / (quot * 16);
658 }
659 quot--;
660
661 calc_deviation = req_baud - baud;
662 if (calc_deviation < 0)
663 calc_deviation = -calc_deviation;
664
665 if (calc_deviation < deviation) {
666 *best_clk = clk;
667 best_quot = quot;
668 *clk_num = cnt;
669 deviation = calc_deviation;
670 }
671 }
672
673 return best_quot;
674 }
675
676 /* udivslot_table[]
677 *
678 * This table takes the fractional value of the baud divisor and gives
679 * the recommended setting for the UDIVSLOT register.
680 */
681 static u16 udivslot_table[16] = {
682 [0] = 0x0000,
683 [1] = 0x0080,
684 [2] = 0x0808,
685 [3] = 0x0888,
686 [4] = 0x2222,
687 [5] = 0x4924,
688 [6] = 0x4A52,
689 [7] = 0x54AA,
690 [8] = 0x5555,
691 [9] = 0xD555,
692 [10] = 0xD5D5,
693 [11] = 0xDDD5,
694 [12] = 0xDDDD,
695 [13] = 0xDFDD,
696 [14] = 0xDFDF,
697 [15] = 0xFFDF,
698 };
699
700 static void s3c24xx_serial_set_termios(struct uart_port *port,
701 struct ktermios *termios,
702 struct ktermios *old)
703 {
704 struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
705 struct s3c24xx_uart_port *ourport = to_ourport(port);
706 struct clk *clk = ERR_PTR(-EINVAL);
707 unsigned long flags;
708 unsigned int baud, quot, clk_sel = 0;
709 unsigned int ulcon;
710 unsigned int umcon;
711 unsigned int udivslot = 0;
712
713 /*
714 * We don't support modem control lines.
715 */
716 termios->c_cflag &= ~(HUPCL | CMSPAR);
717 termios->c_cflag |= CLOCAL;
718
719 /*
720 * Ask the core to calculate the divisor for us.
721 */
722
723 baud = uart_get_baud_rate(port, termios, old, 0, 115200*8);
724 quot = s3c24xx_serial_getclk(ourport, baud, &clk, &clk_sel);
725 if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
726 quot = port->custom_divisor;
727 if (IS_ERR(clk))
728 return;
729
730 /* check to see if we need to change clock source */
731
732 if (ourport->baudclk != clk) {
733 s3c24xx_serial_setsource(port, clk_sel);
734
735 if (!IS_ERR(ourport->baudclk)) {
736 clk_disable_unprepare(ourport->baudclk);
737 ourport->baudclk = ERR_PTR(-EINVAL);
738 }
739
740 clk_prepare_enable(clk);
741
742 ourport->baudclk = clk;
743 ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0;
744 }
745
746 if (ourport->info->has_divslot) {
747 unsigned int div = ourport->baudclk_rate / baud;
748
749 if (cfg->has_fracval) {
750 udivslot = (div & 15);
751 dbg("fracval = %04x\n", udivslot);
752 } else {
753 udivslot = udivslot_table[div & 15];
754 dbg("udivslot = %04x (div %d)\n", udivslot, div & 15);
755 }
756 }
757
758 switch (termios->c_cflag & CSIZE) {
759 case CS5:
760 dbg("config: 5bits/char\n");
761 ulcon = S3C2410_LCON_CS5;
762 break;
763 case CS6:
764 dbg("config: 6bits/char\n");
765 ulcon = S3C2410_LCON_CS6;
766 break;
767 case CS7:
768 dbg("config: 7bits/char\n");
769 ulcon = S3C2410_LCON_CS7;
770 break;
771 case CS8:
772 default:
773 dbg("config: 8bits/char\n");
774 ulcon = S3C2410_LCON_CS8;
775 break;
776 }
777
778 /* preserve original lcon IR settings */
779 ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
780
781 if (termios->c_cflag & CSTOPB)
782 ulcon |= S3C2410_LCON_STOPB;
783
784 if (termios->c_cflag & PARENB) {
785 if (termios->c_cflag & PARODD)
786 ulcon |= S3C2410_LCON_PODD;
787 else
788 ulcon |= S3C2410_LCON_PEVEN;
789 } else {
790 ulcon |= S3C2410_LCON_PNONE;
791 }
792
793 spin_lock_irqsave(&port->lock, flags);
794
795 dbg("setting ulcon to %08x, brddiv to %d, udivslot %08x\n",
796 ulcon, quot, udivslot);
797
798 wr_regl(port, S3C2410_ULCON, ulcon);
799 wr_regl(port, S3C2410_UBRDIV, quot);
800
801 umcon = rd_regl(port, S3C2410_UMCON);
802 if (termios->c_cflag & CRTSCTS) {
803 umcon |= S3C2410_UMCOM_AFC;
804 /* Disable RTS when RX FIFO contains 63 bytes */
805 umcon &= ~S3C2412_UMCON_AFC_8;
806 } else {
807 umcon &= ~S3C2410_UMCOM_AFC;
808 }
809 wr_regl(port, S3C2410_UMCON, umcon);
810
811 if (ourport->info->has_divslot)
812 wr_regl(port, S3C2443_DIVSLOT, udivslot);
813
814 dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
815 rd_regl(port, S3C2410_ULCON),
816 rd_regl(port, S3C2410_UCON),
817 rd_regl(port, S3C2410_UFCON));
818
819 /*
820 * Update the per-port timeout.
821 */
822 uart_update_timeout(port, termios->c_cflag, baud);
823
824 /*
825 * Which character status flags are we interested in?
826 */
827 port->read_status_mask = S3C2410_UERSTAT_OVERRUN;
828 if (termios->c_iflag & INPCK)
829 port->read_status_mask |= S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_PARITY;
830
831 /*
832 * Which character status flags should we ignore?
833 */
834 port->ignore_status_mask = 0;
835 if (termios->c_iflag & IGNPAR)
836 port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN;
837 if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
838 port->ignore_status_mask |= S3C2410_UERSTAT_FRAME;
839
840 /*
841 * Ignore all characters if CREAD is not set.
842 */
843 if ((termios->c_cflag & CREAD) == 0)
844 port->ignore_status_mask |= RXSTAT_DUMMY_READ;
845
846 spin_unlock_irqrestore(&port->lock, flags);
847 }
848
849 static const char *s3c24xx_serial_type(struct uart_port *port)
850 {
851 switch (port->type) {
852 case PORT_S3C2410:
853 return "S3C2410";
854 case PORT_S3C2440:
855 return "S3C2440";
856 case PORT_S3C2412:
857 return "S3C2412";
858 case PORT_S3C6400:
859 return "S3C6400/10";
860 default:
861 return NULL;
862 }
863 }
864
865 #define MAP_SIZE (0x100)
866
867 static void s3c24xx_serial_release_port(struct uart_port *port)
868 {
869 release_mem_region(port->mapbase, MAP_SIZE);
870 }
871
872 static int s3c24xx_serial_request_port(struct uart_port *port)
873 {
874 const char *name = s3c24xx_serial_portname(port);
875 return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY;
876 }
877
878 static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
879 {
880 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
881
882 if (flags & UART_CONFIG_TYPE &&
883 s3c24xx_serial_request_port(port) == 0)
884 port->type = info->type;
885 }
886
887 /*
888 * verify the new serial_struct (for TIOCSSERIAL).
889 */
890 static int
891 s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
892 {
893 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
894
895 if (ser->type != PORT_UNKNOWN && ser->type != info->type)
896 return -EINVAL;
897
898 return 0;
899 }
900
901
902 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
903
904 static struct console s3c24xx_serial_console;
905
906 static int __init s3c24xx_serial_console_init(void)
907 {
908 register_console(&s3c24xx_serial_console);
909 return 0;
910 }
911 console_initcall(s3c24xx_serial_console_init);
912
913 #define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
914 #else
915 #define S3C24XX_SERIAL_CONSOLE NULL
916 #endif
917
918 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
919 static int s3c24xx_serial_get_poll_char(struct uart_port *port);
920 static void s3c24xx_serial_put_poll_char(struct uart_port *port,
921 unsigned char c);
922 #endif
923
924 static struct uart_ops s3c24xx_serial_ops = {
925 .pm = s3c24xx_serial_pm,
926 .tx_empty = s3c24xx_serial_tx_empty,
927 .get_mctrl = s3c24xx_serial_get_mctrl,
928 .set_mctrl = s3c24xx_serial_set_mctrl,
929 .stop_tx = s3c24xx_serial_stop_tx,
930 .start_tx = s3c24xx_serial_start_tx,
931 .stop_rx = s3c24xx_serial_stop_rx,
932 .enable_ms = s3c24xx_serial_enable_ms,
933 .break_ctl = s3c24xx_serial_break_ctl,
934 .startup = s3c24xx_serial_startup,
935 .shutdown = s3c24xx_serial_shutdown,
936 .set_termios = s3c24xx_serial_set_termios,
937 .type = s3c24xx_serial_type,
938 .release_port = s3c24xx_serial_release_port,
939 .request_port = s3c24xx_serial_request_port,
940 .config_port = s3c24xx_serial_config_port,
941 .verify_port = s3c24xx_serial_verify_port,
942 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
943 .poll_get_char = s3c24xx_serial_get_poll_char,
944 .poll_put_char = s3c24xx_serial_put_poll_char,
945 #endif
946 };
947
948 static struct uart_driver s3c24xx_uart_drv = {
949 .owner = THIS_MODULE,
950 .driver_name = "s3c2410_serial",
951 .nr = CONFIG_SERIAL_SAMSUNG_UARTS,
952 .cons = S3C24XX_SERIAL_CONSOLE,
953 .dev_name = S3C24XX_SERIAL_NAME,
954 .major = S3C24XX_SERIAL_MAJOR,
955 .minor = S3C24XX_SERIAL_MINOR,
956 };
957
958 static struct s3c24xx_uart_port s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = {
959 [0] = {
960 .port = {
961 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[0].port.lock),
962 .iotype = UPIO_MEM,
963 .uartclk = 0,
964 .fifosize = 16,
965 .ops = &s3c24xx_serial_ops,
966 .flags = UPF_BOOT_AUTOCONF,
967 .line = 0,
968 }
969 },
970 [1] = {
971 .port = {
972 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[1].port.lock),
973 .iotype = UPIO_MEM,
974 .uartclk = 0,
975 .fifosize = 16,
976 .ops = &s3c24xx_serial_ops,
977 .flags = UPF_BOOT_AUTOCONF,
978 .line = 1,
979 }
980 },
981 #if CONFIG_SERIAL_SAMSUNG_UARTS > 2
982
983 [2] = {
984 .port = {
985 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[2].port.lock),
986 .iotype = UPIO_MEM,
987 .uartclk = 0,
988 .fifosize = 16,
989 .ops = &s3c24xx_serial_ops,
990 .flags = UPF_BOOT_AUTOCONF,
991 .line = 2,
992 }
993 },
994 #endif
995 #if CONFIG_SERIAL_SAMSUNG_UARTS > 3
996 [3] = {
997 .port = {
998 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[3].port.lock),
999 .iotype = UPIO_MEM,
1000 .uartclk = 0,
1001 .fifosize = 16,
1002 .ops = &s3c24xx_serial_ops,
1003 .flags = UPF_BOOT_AUTOCONF,
1004 .line = 3,
1005 }
1006 }
1007 #endif
1008 };
1009
1010 /* s3c24xx_serial_resetport
1011 *
1012 * reset the fifos and other the settings.
1013 */
1014
1015 static void s3c24xx_serial_resetport(struct uart_port *port,
1016 struct s3c2410_uartcfg *cfg)
1017 {
1018 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1019 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1020 unsigned int ucon_mask;
1021
1022 ucon_mask = info->clksel_mask;
1023 if (info->type == PORT_S3C2440)
1024 ucon_mask |= S3C2440_UCON0_DIVMASK;
1025
1026 ucon &= ucon_mask;
1027 wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
1028
1029 /* reset both fifos */
1030 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1031 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1032
1033 /* some delay is required after fifo reset */
1034 udelay(1);
1035 }
1036
1037
1038 #ifdef CONFIG_CPU_FREQ
1039
1040 static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb,
1041 unsigned long val, void *data)
1042 {
1043 struct s3c24xx_uart_port *port;
1044 struct uart_port *uport;
1045
1046 port = container_of(nb, struct s3c24xx_uart_port, freq_transition);
1047 uport = &port->port;
1048
1049 /* check to see if port is enabled */
1050
1051 if (port->pm_level != 0)
1052 return 0;
1053
1054 /* try and work out if the baudrate is changing, we can detect
1055 * a change in rate, but we do not have support for detecting
1056 * a disturbance in the clock-rate over the change.
1057 */
1058
1059 if (IS_ERR(port->baudclk))
1060 goto exit;
1061
1062 if (port->baudclk_rate == clk_get_rate(port->baudclk))
1063 goto exit;
1064
1065 if (val == CPUFREQ_PRECHANGE) {
1066 /* we should really shut the port down whilst the
1067 * frequency change is in progress. */
1068
1069 } else if (val == CPUFREQ_POSTCHANGE) {
1070 struct ktermios *termios;
1071 struct tty_struct *tty;
1072
1073 if (uport->state == NULL)
1074 goto exit;
1075
1076 tty = uport->state->port.tty;
1077
1078 if (tty == NULL)
1079 goto exit;
1080
1081 termios = &tty->termios;
1082
1083 if (termios == NULL) {
1084 dev_warn(uport->dev, "%s: no termios?\n", __func__);
1085 goto exit;
1086 }
1087
1088 s3c24xx_serial_set_termios(uport, termios, NULL);
1089 }
1090
1091 exit:
1092 return 0;
1093 }
1094
1095 static inline int s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1096 {
1097 port->freq_transition.notifier_call = s3c24xx_serial_cpufreq_transition;
1098
1099 return cpufreq_register_notifier(&port->freq_transition,
1100 CPUFREQ_TRANSITION_NOTIFIER);
1101 }
1102
1103 static inline void s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1104 {
1105 cpufreq_unregister_notifier(&port->freq_transition,
1106 CPUFREQ_TRANSITION_NOTIFIER);
1107 }
1108
1109 #else
1110 static inline int s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1111 {
1112 return 0;
1113 }
1114
1115 static inline void s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1116 {
1117 }
1118 #endif
1119
1120 /* s3c24xx_serial_init_port
1121 *
1122 * initialise a single serial port from the platform device given
1123 */
1124
1125 static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
1126 struct platform_device *platdev)
1127 {
1128 struct uart_port *port = &ourport->port;
1129 struct s3c2410_uartcfg *cfg = ourport->cfg;
1130 struct resource *res;
1131 int ret;
1132
1133 dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev);
1134
1135 if (platdev == NULL)
1136 return -ENODEV;
1137
1138 if (port->mapbase != 0)
1139 return 0;
1140
1141 /* setup info for port */
1142 port->dev = &platdev->dev;
1143
1144 /* Startup sequence is different for s3c64xx and higher SoC's */
1145 if (s3c24xx_serial_has_interrupt_mask(port))
1146 s3c24xx_serial_ops.startup = s3c64xx_serial_startup;
1147
1148 port->uartclk = 1;
1149
1150 if (cfg->uart_flags & UPF_CONS_FLOW) {
1151 dbg("s3c24xx_serial_init_port: enabling flow control\n");
1152 port->flags |= UPF_CONS_FLOW;
1153 }
1154
1155 /* sort our the physical and virtual addresses for each UART */
1156
1157 res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
1158 if (res == NULL) {
1159 dev_err(port->dev, "failed to find memory resource for uart\n");
1160 return -EINVAL;
1161 }
1162
1163 dbg("resource %p (%lx..%lx)\n", res, res->start, res->end);
1164
1165 port->membase = devm_ioremap(port->dev, res->start, resource_size(res));
1166 if (!port->membase) {
1167 dev_err(port->dev, "failed to remap controller address\n");
1168 return -EBUSY;
1169 }
1170
1171 port->mapbase = res->start;
1172 ret = platform_get_irq(platdev, 0);
1173 if (ret < 0)
1174 port->irq = 0;
1175 else {
1176 port->irq = ret;
1177 ourport->rx_irq = ret;
1178 ourport->tx_irq = ret + 1;
1179 }
1180
1181 ret = platform_get_irq(platdev, 1);
1182 if (ret > 0)
1183 ourport->tx_irq = ret;
1184
1185 ourport->clk = clk_get(&platdev->dev, "uart");
1186 if (IS_ERR(ourport->clk)) {
1187 pr_err("%s: Controller clock not found\n",
1188 dev_name(&platdev->dev));
1189 return PTR_ERR(ourport->clk);
1190 }
1191
1192 ret = clk_prepare_enable(ourport->clk);
1193 if (ret) {
1194 pr_err("uart: clock failed to prepare+enable: %d\n", ret);
1195 clk_put(ourport->clk);
1196 return ret;
1197 }
1198
1199 /* Keep all interrupts masked and cleared */
1200 if (s3c24xx_serial_has_interrupt_mask(port)) {
1201 wr_regl(port, S3C64XX_UINTM, 0xf);
1202 wr_regl(port, S3C64XX_UINTP, 0xf);
1203 wr_regl(port, S3C64XX_UINTSP, 0xf);
1204 }
1205
1206 dbg("port: map=%08x, mem=%08x, irq=%d (%d,%d), clock=%ld\n",
1207 port->mapbase, port->membase, port->irq,
1208 ourport->rx_irq, ourport->tx_irq, port->uartclk);
1209
1210 /* reset the fifos (and setup the uart) */
1211 s3c24xx_serial_resetport(port, cfg);
1212 return 0;
1213 }
1214
1215 #ifdef CONFIG_SAMSUNG_CLOCK
1216 static ssize_t s3c24xx_serial_show_clksrc(struct device *dev,
1217 struct device_attribute *attr,
1218 char *buf)
1219 {
1220 struct uart_port *port = s3c24xx_dev_to_port(dev);
1221 struct s3c24xx_uart_port *ourport = to_ourport(port);
1222
1223 if (IS_ERR(ourport->baudclk))
1224 return -EINVAL;
1225
1226 return snprintf(buf, PAGE_SIZE, "* %s\n",
1227 ourport->baudclk->name ?: "(null)");
1228 }
1229
1230 static DEVICE_ATTR(clock_source, S_IRUGO, s3c24xx_serial_show_clksrc, NULL);
1231 #endif
1232
1233 /* Device driver serial port probe */
1234
1235 static const struct of_device_id s3c24xx_uart_dt_match[];
1236 static int probe_index;
1237
1238 static inline struct s3c24xx_serial_drv_data *s3c24xx_get_driver_data(
1239 struct platform_device *pdev)
1240 {
1241 #ifdef CONFIG_OF
1242 if (pdev->dev.of_node) {
1243 const struct of_device_id *match;
1244 match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node);
1245 return (struct s3c24xx_serial_drv_data *)match->data;
1246 }
1247 #endif
1248 return (struct s3c24xx_serial_drv_data *)
1249 platform_get_device_id(pdev)->driver_data;
1250 }
1251
1252 static int s3c24xx_serial_probe(struct platform_device *pdev)
1253 {
1254 struct s3c24xx_uart_port *ourport;
1255 int ret;
1256
1257 dbg("s3c24xx_serial_probe(%p) %d\n", pdev, probe_index);
1258
1259 ourport = &s3c24xx_serial_ports[probe_index];
1260
1261 ourport->drv_data = s3c24xx_get_driver_data(pdev);
1262 if (!ourport->drv_data) {
1263 dev_err(&pdev->dev, "could not find driver data\n");
1264 return -ENODEV;
1265 }
1266
1267 ourport->baudclk = ERR_PTR(-EINVAL);
1268 ourport->info = ourport->drv_data->info;
1269 ourport->cfg = (dev_get_platdata(&pdev->dev)) ?
1270 dev_get_platdata(&pdev->dev) :
1271 ourport->drv_data->def_cfg;
1272
1273 ourport->port.fifosize = (ourport->info->fifosize) ?
1274 ourport->info->fifosize :
1275 ourport->drv_data->fifosize[probe_index];
1276
1277 probe_index++;
1278
1279 dbg("%s: initialising port %p...\n", __func__, ourport);
1280
1281 ret = s3c24xx_serial_init_port(ourport, pdev);
1282 if (ret < 0)
1283 goto probe_err;
1284
1285 dbg("%s: adding port\n", __func__);
1286 uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
1287 platform_set_drvdata(pdev, &ourport->port);
1288
1289 /*
1290 * Deactivate the clock enabled in s3c24xx_serial_init_port here,
1291 * so that a potential re-enablement through the pm-callback overlaps
1292 * and keeps the clock enabled in this case.
1293 */
1294 clk_disable_unprepare(ourport->clk);
1295
1296 #ifdef CONFIG_SAMSUNG_CLOCK
1297 ret = device_create_file(&pdev->dev, &dev_attr_clock_source);
1298 if (ret < 0)
1299 dev_err(&pdev->dev, "failed to add clock source attr.\n");
1300 #endif
1301
1302 ret = s3c24xx_serial_cpufreq_register(ourport);
1303 if (ret < 0)
1304 dev_err(&pdev->dev, "failed to add cpufreq notifier\n");
1305
1306 return 0;
1307
1308 probe_err:
1309 return ret;
1310 }
1311
1312 static int s3c24xx_serial_remove(struct platform_device *dev)
1313 {
1314 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1315
1316 if (port) {
1317 s3c24xx_serial_cpufreq_deregister(to_ourport(port));
1318 #ifdef CONFIG_SAMSUNG_CLOCK
1319 device_remove_file(&dev->dev, &dev_attr_clock_source);
1320 #endif
1321 uart_remove_one_port(&s3c24xx_uart_drv, port);
1322 }
1323
1324 return 0;
1325 }
1326
1327 /* UART power management code */
1328 #ifdef CONFIG_PM_SLEEP
1329 static int s3c24xx_serial_suspend(struct device *dev)
1330 {
1331 struct uart_port *port = s3c24xx_dev_to_port(dev);
1332
1333 if (port)
1334 uart_suspend_port(&s3c24xx_uart_drv, port);
1335
1336 return 0;
1337 }
1338
1339 static int s3c24xx_serial_resume(struct device *dev)
1340 {
1341 struct uart_port *port = s3c24xx_dev_to_port(dev);
1342 struct s3c24xx_uart_port *ourport = to_ourport(port);
1343
1344 if (port) {
1345 clk_prepare_enable(ourport->clk);
1346 s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
1347 clk_disable_unprepare(ourport->clk);
1348
1349 uart_resume_port(&s3c24xx_uart_drv, port);
1350 }
1351
1352 return 0;
1353 }
1354
1355 static int s3c24xx_serial_resume_noirq(struct device *dev)
1356 {
1357 struct uart_port *port = s3c24xx_dev_to_port(dev);
1358
1359 if (port) {
1360 /* restore IRQ mask */
1361 if (s3c24xx_serial_has_interrupt_mask(port)) {
1362 unsigned int uintm = 0xf;
1363 if (tx_enabled(port))
1364 uintm &= ~S3C64XX_UINTM_TXD_MSK;
1365 if (rx_enabled(port))
1366 uintm &= ~S3C64XX_UINTM_RXD_MSK;
1367 wr_regl(port, S3C64XX_UINTM, uintm);
1368 }
1369 }
1370
1371 return 0;
1372 }
1373
1374 static const struct dev_pm_ops s3c24xx_serial_pm_ops = {
1375 .suspend = s3c24xx_serial_suspend,
1376 .resume = s3c24xx_serial_resume,
1377 .resume_noirq = s3c24xx_serial_resume_noirq,
1378 };
1379 #define SERIAL_SAMSUNG_PM_OPS (&s3c24xx_serial_pm_ops)
1380
1381 #else /* !CONFIG_PM_SLEEP */
1382
1383 #define SERIAL_SAMSUNG_PM_OPS NULL
1384 #endif /* CONFIG_PM_SLEEP */
1385
1386 /* Console code */
1387
1388 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
1389
1390 static struct uart_port *cons_uart;
1391
1392 static int
1393 s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
1394 {
1395 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1396 unsigned long ufstat, utrstat;
1397
1398 if (ufcon & S3C2410_UFCON_FIFOMODE) {
1399 /* fifo mode - check amount of data in fifo registers... */
1400
1401 ufstat = rd_regl(port, S3C2410_UFSTAT);
1402 return (ufstat & info->tx_fifofull) ? 0 : 1;
1403 }
1404
1405 /* in non-fifo mode, we go and use the tx buffer empty */
1406
1407 utrstat = rd_regl(port, S3C2410_UTRSTAT);
1408 return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
1409 }
1410
1411 static bool
1412 s3c24xx_port_configured(unsigned int ucon)
1413 {
1414 /* consider the serial port configured if the tx/rx mode set */
1415 return (ucon & 0xf) != 0;
1416 }
1417
1418 #ifdef CONFIG_CONSOLE_POLL
1419 /*
1420 * Console polling routines for writing and reading from the uart while
1421 * in an interrupt or debug context.
1422 */
1423
1424 static int s3c24xx_serial_get_poll_char(struct uart_port *port)
1425 {
1426 struct s3c24xx_uart_port *ourport = to_ourport(port);
1427 unsigned int ufstat;
1428
1429 ufstat = rd_regl(port, S3C2410_UFSTAT);
1430 if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
1431 return NO_POLL_CHAR;
1432
1433 return rd_regb(port, S3C2410_URXH);
1434 }
1435
1436 static void s3c24xx_serial_put_poll_char(struct uart_port *port,
1437 unsigned char c)
1438 {
1439 unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON);
1440 unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON);
1441
1442 /* not possible to xmit on unconfigured port */
1443 if (!s3c24xx_port_configured(ucon))
1444 return;
1445
1446 while (!s3c24xx_serial_console_txrdy(port, ufcon))
1447 cpu_relax();
1448 wr_regb(cons_uart, S3C2410_UTXH, c);
1449 }
1450
1451 #endif /* CONFIG_CONSOLE_POLL */
1452
1453 static void
1454 s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
1455 {
1456 unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON);
1457 unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON);
1458
1459 /* not possible to xmit on unconfigured port */
1460 if (!s3c24xx_port_configured(ucon))
1461 return;
1462
1463 while (!s3c24xx_serial_console_txrdy(port, ufcon))
1464 barrier();
1465 wr_regb(cons_uart, S3C2410_UTXH, ch);
1466 }
1467
1468 static void
1469 s3c24xx_serial_console_write(struct console *co, const char *s,
1470 unsigned int count)
1471 {
1472 uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
1473 }
1474
1475 static void __init
1476 s3c24xx_serial_get_options(struct uart_port *port, int *baud,
1477 int *parity, int *bits)
1478 {
1479 struct clk *clk;
1480 unsigned int ulcon;
1481 unsigned int ucon;
1482 unsigned int ubrdiv;
1483 unsigned long rate;
1484 unsigned int clk_sel;
1485 char clk_name[MAX_CLK_NAME_LENGTH];
1486
1487 ulcon = rd_regl(port, S3C2410_ULCON);
1488 ucon = rd_regl(port, S3C2410_UCON);
1489 ubrdiv = rd_regl(port, S3C2410_UBRDIV);
1490
1491 dbg("s3c24xx_serial_get_options: port=%p\n"
1492 "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
1493 port, ulcon, ucon, ubrdiv);
1494
1495 if (s3c24xx_port_configured(ucon)) {
1496 switch (ulcon & S3C2410_LCON_CSMASK) {
1497 case S3C2410_LCON_CS5:
1498 *bits = 5;
1499 break;
1500 case S3C2410_LCON_CS6:
1501 *bits = 6;
1502 break;
1503 case S3C2410_LCON_CS7:
1504 *bits = 7;
1505 break;
1506 default:
1507 case S3C2410_LCON_CS8:
1508 *bits = 8;
1509 break;
1510 }
1511
1512 switch (ulcon & S3C2410_LCON_PMASK) {
1513 case S3C2410_LCON_PEVEN:
1514 *parity = 'e';
1515 break;
1516
1517 case S3C2410_LCON_PODD:
1518 *parity = 'o';
1519 break;
1520
1521 case S3C2410_LCON_PNONE:
1522 default:
1523 *parity = 'n';
1524 }
1525
1526 /* now calculate the baud rate */
1527
1528 clk_sel = s3c24xx_serial_getsource(port);
1529 sprintf(clk_name, "clk_uart_baud%d", clk_sel);
1530
1531 clk = clk_get(port->dev, clk_name);
1532 if (!IS_ERR(clk))
1533 rate = clk_get_rate(clk);
1534 else
1535 rate = 1;
1536
1537 *baud = rate / (16 * (ubrdiv + 1));
1538 dbg("calculated baud %d\n", *baud);
1539 }
1540
1541 }
1542
1543 static int __init
1544 s3c24xx_serial_console_setup(struct console *co, char *options)
1545 {
1546 struct uart_port *port;
1547 int baud = 9600;
1548 int bits = 8;
1549 int parity = 'n';
1550 int flow = 'n';
1551
1552 dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n",
1553 co, co->index, options);
1554
1555 /* is this a valid port */
1556
1557 if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS)
1558 co->index = 0;
1559
1560 port = &s3c24xx_serial_ports[co->index].port;
1561
1562 /* is the port configured? */
1563
1564 if (port->mapbase == 0x0)
1565 return -ENODEV;
1566
1567 cons_uart = port;
1568
1569 dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index);
1570
1571 /*
1572 * Check whether an invalid uart number has been specified, and
1573 * if so, search for the first available port that does have
1574 * console support.
1575 */
1576 if (options)
1577 uart_parse_options(options, &baud, &parity, &bits, &flow);
1578 else
1579 s3c24xx_serial_get_options(port, &baud, &parity, &bits);
1580
1581 dbg("s3c24xx_serial_console_setup: baud %d\n", baud);
1582
1583 return uart_set_options(port, co, baud, parity, bits, flow);
1584 }
1585
1586 static struct console s3c24xx_serial_console = {
1587 .name = S3C24XX_SERIAL_NAME,
1588 .device = uart_console_device,
1589 .flags = CON_PRINTBUFFER,
1590 .index = -1,
1591 .write = s3c24xx_serial_console_write,
1592 .setup = s3c24xx_serial_console_setup,
1593 .data = &s3c24xx_uart_drv,
1594 };
1595 #endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */
1596
1597 #ifdef CONFIG_CPU_S3C2410
1598 static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = {
1599 .info = &(struct s3c24xx_uart_info) {
1600 .name = "Samsung S3C2410 UART",
1601 .type = PORT_S3C2410,
1602 .fifosize = 16,
1603 .rx_fifomask = S3C2410_UFSTAT_RXMASK,
1604 .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
1605 .rx_fifofull = S3C2410_UFSTAT_RXFULL,
1606 .tx_fifofull = S3C2410_UFSTAT_TXFULL,
1607 .tx_fifomask = S3C2410_UFSTAT_TXMASK,
1608 .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
1609 .def_clk_sel = S3C2410_UCON_CLKSEL0,
1610 .num_clks = 2,
1611 .clksel_mask = S3C2410_UCON_CLKMASK,
1612 .clksel_shift = S3C2410_UCON_CLKSHIFT,
1613 },
1614 .def_cfg = &(struct s3c2410_uartcfg) {
1615 .ucon = S3C2410_UCON_DEFAULT,
1616 .ufcon = S3C2410_UFCON_DEFAULT,
1617 },
1618 };
1619 #define S3C2410_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2410_serial_drv_data)
1620 #else
1621 #define S3C2410_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1622 #endif
1623
1624 #ifdef CONFIG_CPU_S3C2412
1625 static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = {
1626 .info = &(struct s3c24xx_uart_info) {
1627 .name = "Samsung S3C2412 UART",
1628 .type = PORT_S3C2412,
1629 .fifosize = 64,
1630 .has_divslot = 1,
1631 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1632 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1633 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1634 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1635 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1636 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1637 .def_clk_sel = S3C2410_UCON_CLKSEL2,
1638 .num_clks = 4,
1639 .clksel_mask = S3C2412_UCON_CLKMASK,
1640 .clksel_shift = S3C2412_UCON_CLKSHIFT,
1641 },
1642 .def_cfg = &(struct s3c2410_uartcfg) {
1643 .ucon = S3C2410_UCON_DEFAULT,
1644 .ufcon = S3C2410_UFCON_DEFAULT,
1645 },
1646 };
1647 #define S3C2412_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2412_serial_drv_data)
1648 #else
1649 #define S3C2412_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1650 #endif
1651
1652 #if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2416) || \
1653 defined(CONFIG_CPU_S3C2443) || defined(CONFIG_CPU_S3C2442)
1654 static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
1655 .info = &(struct s3c24xx_uart_info) {
1656 .name = "Samsung S3C2440 UART",
1657 .type = PORT_S3C2440,
1658 .fifosize = 64,
1659 .has_divslot = 1,
1660 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1661 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1662 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1663 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1664 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1665 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1666 .def_clk_sel = S3C2410_UCON_CLKSEL2,
1667 .num_clks = 4,
1668 .clksel_mask = S3C2412_UCON_CLKMASK,
1669 .clksel_shift = S3C2412_UCON_CLKSHIFT,
1670 },
1671 .def_cfg = &(struct s3c2410_uartcfg) {
1672 .ucon = S3C2410_UCON_DEFAULT,
1673 .ufcon = S3C2410_UFCON_DEFAULT,
1674 },
1675 };
1676 #define S3C2440_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2440_serial_drv_data)
1677 #else
1678 #define S3C2440_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1679 #endif
1680
1681 #if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410) || \
1682 defined(CONFIG_CPU_S5P6440) || defined(CONFIG_CPU_S5P6450) || \
1683 defined(CONFIG_CPU_S5PC100)
1684 static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
1685 .info = &(struct s3c24xx_uart_info) {
1686 .name = "Samsung S3C6400 UART",
1687 .type = PORT_S3C6400,
1688 .fifosize = 64,
1689 .has_divslot = 1,
1690 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1691 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1692 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1693 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1694 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1695 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1696 .def_clk_sel = S3C2410_UCON_CLKSEL2,
1697 .num_clks = 4,
1698 .clksel_mask = S3C6400_UCON_CLKMASK,
1699 .clksel_shift = S3C6400_UCON_CLKSHIFT,
1700 },
1701 .def_cfg = &(struct s3c2410_uartcfg) {
1702 .ucon = S3C2410_UCON_DEFAULT,
1703 .ufcon = S3C2410_UFCON_DEFAULT,
1704 },
1705 };
1706 #define S3C6400_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c6400_serial_drv_data)
1707 #else
1708 #define S3C6400_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1709 #endif
1710
1711 #ifdef CONFIG_CPU_S5PV210
1712 static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
1713 .info = &(struct s3c24xx_uart_info) {
1714 .name = "Samsung S5PV210 UART",
1715 .type = PORT_S3C6400,
1716 .has_divslot = 1,
1717 .rx_fifomask = S5PV210_UFSTAT_RXMASK,
1718 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT,
1719 .rx_fifofull = S5PV210_UFSTAT_RXFULL,
1720 .tx_fifofull = S5PV210_UFSTAT_TXFULL,
1721 .tx_fifomask = S5PV210_UFSTAT_TXMASK,
1722 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT,
1723 .def_clk_sel = S3C2410_UCON_CLKSEL0,
1724 .num_clks = 2,
1725 .clksel_mask = S5PV210_UCON_CLKMASK,
1726 .clksel_shift = S5PV210_UCON_CLKSHIFT,
1727 },
1728 .def_cfg = &(struct s3c2410_uartcfg) {
1729 .ucon = S5PV210_UCON_DEFAULT,
1730 .ufcon = S5PV210_UFCON_DEFAULT,
1731 },
1732 .fifosize = { 256, 64, 16, 16 },
1733 };
1734 #define S5PV210_SERIAL_DRV_DATA ((kernel_ulong_t)&s5pv210_serial_drv_data)
1735 #else
1736 #define S5PV210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1737 #endif
1738
1739 #if defined(CONFIG_ARCH_EXYNOS)
1740 static struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = {
1741 .info = &(struct s3c24xx_uart_info) {
1742 .name = "Samsung Exynos4 UART",
1743 .type = PORT_S3C6400,
1744 .has_divslot = 1,
1745 .rx_fifomask = S5PV210_UFSTAT_RXMASK,
1746 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT,
1747 .rx_fifofull = S5PV210_UFSTAT_RXFULL,
1748 .tx_fifofull = S5PV210_UFSTAT_TXFULL,
1749 .tx_fifomask = S5PV210_UFSTAT_TXMASK,
1750 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT,
1751 .def_clk_sel = S3C2410_UCON_CLKSEL0,
1752 .num_clks = 1,
1753 .clksel_mask = 0,
1754 .clksel_shift = 0,
1755 },
1756 .def_cfg = &(struct s3c2410_uartcfg) {
1757 .ucon = S5PV210_UCON_DEFAULT,
1758 .ufcon = S5PV210_UFCON_DEFAULT,
1759 .has_fracval = 1,
1760 },
1761 .fifosize = { 256, 64, 16, 16 },
1762 };
1763 #define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos4210_serial_drv_data)
1764 #else
1765 #define EXYNOS4210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1766 #endif
1767
1768 static struct platform_device_id s3c24xx_serial_driver_ids[] = {
1769 {
1770 .name = "s3c2410-uart",
1771 .driver_data = S3C2410_SERIAL_DRV_DATA,
1772 }, {
1773 .name = "s3c2412-uart",
1774 .driver_data = S3C2412_SERIAL_DRV_DATA,
1775 }, {
1776 .name = "s3c2440-uart",
1777 .driver_data = S3C2440_SERIAL_DRV_DATA,
1778 }, {
1779 .name = "s3c6400-uart",
1780 .driver_data = S3C6400_SERIAL_DRV_DATA,
1781 }, {
1782 .name = "s5pv210-uart",
1783 .driver_data = S5PV210_SERIAL_DRV_DATA,
1784 }, {
1785 .name = "exynos4210-uart",
1786 .driver_data = EXYNOS4210_SERIAL_DRV_DATA,
1787 },
1788 { },
1789 };
1790 MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids);
1791
1792 #ifdef CONFIG_OF
1793 static const struct of_device_id s3c24xx_uart_dt_match[] = {
1794 { .compatible = "samsung,s3c2410-uart",
1795 .data = (void *)S3C2410_SERIAL_DRV_DATA },
1796 { .compatible = "samsung,s3c2412-uart",
1797 .data = (void *)S3C2412_SERIAL_DRV_DATA },
1798 { .compatible = "samsung,s3c2440-uart",
1799 .data = (void *)S3C2440_SERIAL_DRV_DATA },
1800 { .compatible = "samsung,s3c6400-uart",
1801 .data = (void *)S3C6400_SERIAL_DRV_DATA },
1802 { .compatible = "samsung,s5pv210-uart",
1803 .data = (void *)S5PV210_SERIAL_DRV_DATA },
1804 { .compatible = "samsung,exynos4210-uart",
1805 .data = (void *)EXYNOS4210_SERIAL_DRV_DATA },
1806 {},
1807 };
1808 MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match);
1809 #endif
1810
1811 static struct platform_driver samsung_serial_driver = {
1812 .probe = s3c24xx_serial_probe,
1813 .remove = s3c24xx_serial_remove,
1814 .id_table = s3c24xx_serial_driver_ids,
1815 .driver = {
1816 .name = "samsung-uart",
1817 .owner = THIS_MODULE,
1818 .pm = SERIAL_SAMSUNG_PM_OPS,
1819 .of_match_table = of_match_ptr(s3c24xx_uart_dt_match),
1820 },
1821 };
1822
1823 /* module initialisation code */
1824
1825 static int __init s3c24xx_serial_modinit(void)
1826 {
1827 int ret;
1828
1829 ret = uart_register_driver(&s3c24xx_uart_drv);
1830 if (ret < 0) {
1831 pr_err("Failed to register Samsung UART driver\n");
1832 return ret;
1833 }
1834
1835 ret = platform_driver_register(&samsung_serial_driver);
1836 if (ret < 0) {
1837 pr_err("Failed to register platform driver\n");
1838 uart_unregister_driver(&s3c24xx_uart_drv);
1839 }
1840
1841 return ret;
1842 }
1843
1844 static void __exit s3c24xx_serial_modexit(void)
1845 {
1846 platform_driver_unregister(&samsung_serial_driver);
1847 uart_unregister_driver(&s3c24xx_uart_drv);
1848 }
1849
1850 module_init(s3c24xx_serial_modinit);
1851 module_exit(s3c24xx_serial_modexit);
1852
1853 MODULE_ALIAS("platform:samsung-uart");
1854 MODULE_DESCRIPTION("Samsung SoC Serial port driver");
1855 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
1856 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support