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Linux 3.4.102
[linux/fpc-iii.git] / drivers / tty / serial / samsung.c
blobd8b0aee35632ede1a2f98ea7a1a751926a3c3e0a
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/delay.h>
43 #include <linux/clk.h>
44 #include <linux/cpufreq.h>
45 #include <linux/of.h>
46
47 #include <asm/irq.h>
48
49 #include <mach/hardware.h>
50 #include <mach/map.h>
51
52 #include <plat/regs-serial.h>
53 #include <plat/clock.h>
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
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
68 /* flag to ignore all characters coming in */
69 #define RXSTAT_DUMMY_READ (0x10000000)
70
71 static 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
78 static inline const char *s3c24xx_serial_portname(struct uart_port *port)
79 {
80 return to_platform_device(port->dev)->name;
81 }
82
83 static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
84 {
85 return (rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE);
86 }
87
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 */
93 static int s3c24xx_serial_has_interrupt_mask(struct uart_port *port)
94 {
95 return to_ourport(port)->info->type == PORT_S3C6400;
96 }
97
98 static 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
121 static 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
136 static void s3c24xx_serial_stop_tx(struct uart_port *port)
137 {
138 struct s3c24xx_uart_port *ourport = to_ourport(port);
139
140 if (tx_enabled(port)) {
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);
146 tx_enabled(port) = 0;
147 if (port->flags & UPF_CONS_FLOW)
148 s3c24xx_serial_rx_enable(port);
149 }
150 }
151
152 static void s3c24xx_serial_start_tx(struct uart_port *port)
153 {
154 struct s3c24xx_uart_port *ourport = to_ourport(port);
155
156 if (!tx_enabled(port)) {
157 if (port->flags & UPF_CONS_FLOW)
158 s3c24xx_serial_rx_disable(port);
159
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);
165 tx_enabled(port) = 1;
166 }
167 }
168
169 static void s3c24xx_serial_stop_rx(struct uart_port *port)
170 {
171 struct s3c24xx_uart_port *ourport = to_ourport(port);
172
173 if (rx_enabled(port)) {
174 dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
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);
180 rx_enabled(port) = 0;
181 }
182 }
183
184 static void s3c24xx_serial_enable_ms(struct uart_port *port)
185 {
186 }
187
188 static inline struct s3c24xx_uart_info *s3c24xx_port_to_info(struct uart_port *port)
189 {
190 return to_ourport(port)->info;
191 }
192
193 static inline struct s3c2410_uartcfg *s3c24xx_port_to_cfg(struct uart_port *port)
194 {
195 struct s3c24xx_uart_port *ourport;
196
197 if (port->dev == NULL)
198 return NULL;
199
200 ourport = container_of(port, struct s3c24xx_uart_port, port);
201 return ourport->cfg;
202 }
203
204 static 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)
210 return ourport->port.fifosize;
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
219 static irqreturn_t
220 s3c24xx_serial_rx_chars(int irq, void *dev_id)
221 {
222 struct s3c24xx_uart_port *ourport = dev_id;
223 struct uart_port *port = &ourport->port;
224 struct tty_struct *tty = port->state->port.tty;
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
305 static 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;
309 struct circ_buf *xmit = &port->state->xmit;
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
319 /* if there isn't anything more to transmit, or the uart is now
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
349 /* interrupt handler for s3c64xx and later SoC's.*/
350 static 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
371 static 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 */
389 static 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
399 static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
400 {
401 /* todo - possibly remove AFC and do manual CTS */
402 }
403
404 static 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
423 static void s3c24xx_serial_shutdown(struct uart_port *port)
424 {
425 struct s3c24xx_uart_port *ourport = to_ourport(port);
426
427 if (ourport->tx_claimed) {
428 if (!s3c24xx_serial_has_interrupt_mask(port))
429 free_irq(ourport->tx_irq, ourport);
430 tx_enabled(port) = 0;
431 ourport->tx_claimed = 0;
432 }
433
434 if (ourport->rx_claimed) {
435 if (!s3c24xx_serial_has_interrupt_mask(port))
436 free_irq(ourport->rx_irq, ourport);
437 ourport->rx_claimed = 0;
438 rx_enabled(port) = 0;
439 }
440
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 }
447
448 static 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
458 ret = request_irq(ourport->rx_irq, s3c24xx_serial_rx_chars, 0,
459 s3c24xx_serial_portname(port), ourport);
460
461 if (ret != 0) {
462 printk(KERN_ERR "cannot get irq %d\n", ourport->rx_irq);
463 return ret;
464 }
465
466 ourport->rx_claimed = 1;
467
468 dbg("requesting tx irq...\n");
469
470 tx_enabled(port) = 1;
471
472 ret = request_irq(ourport->tx_irq, s3c24xx_serial_tx_chars, 0,
473 s3c24xx_serial_portname(port), ourport);
474
475 if (ret) {
476 printk(KERN_ERR "cannot get irq %d\n", ourport->tx_irq);
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
494 static 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
521 /* power power management control */
522
523 static 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
528 ourport->pm_level = level;
529
530 switch (level) {
531 case 3:
532 if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL)
533 clk_disable(ourport->baudclk);
534
535 clk_disable(ourport->clk);
536 break;
537
538 case 0:
539 clk_enable(ourport->clk);
540
541 if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL)
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
563 #define MAX_CLK_NAME_LENGTH 15
564
565 static inline int s3c24xx_serial_getsource(struct uart_port *port)
566 {
567 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
568 unsigned int ucon;
569
570 if (info->num_clks == 1)
571 return 0;
572
573 ucon = rd_regl(port, S3C2410_UCON);
574 ucon &= info->clksel_mask;
575 return ucon >> info->clksel_shift;
576 }
577
578 static void s3c24xx_serial_setsource(struct uart_port *port,
579 unsigned int clk_sel)
580 {
581 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
582 unsigned int ucon;
583
584 if (info->num_clks == 1)
585 return;
586
587 ucon = rd_regl(port, S3C2410_UCON);
588 if ((ucon & info->clksel_mask) >> info->clksel_shift == clk_sel)
589 return;
590
591 ucon &= ~info->clksel_mask;
592 ucon |= clk_sel << info->clksel_shift;
593 wr_regl(port, S3C2410_UCON, ucon);
594 }
595
596 static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
597 unsigned int req_baud, struct clk **best_clk,
598 unsigned int *clk_num)
599 {
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
607 *best_clk = NULL;
608 clk_sel = (ourport->cfg->clk_sel) ? ourport->cfg->clk_sel :
609 ourport->info->def_clk_sel;
610 for (cnt = 0; cnt < info->num_clks; cnt++) {
611 if (!(clk_sel & (1 << cnt)))
612 continue;
613
614 sprintf(clkname, "clk_uart_baud%d", cnt);
615 clk = clk_get(ourport->port.dev, clkname);
616 if (IS_ERR_OR_NULL(clk))
617 continue;
618
619 rate = clk_get_rate(clk);
620 if (!rate)
621 continue;
622
623 if (ourport->info->has_divslot) {
624 unsigned long div = rate / req_baud;
625
626 /* The UDIVSLOT register on the newer UARTs allows us to
627 * get a divisor adjustment of 1/16th on the baud clock.
628 *
629 * We don't keep the UDIVSLOT value (the 16ths we
630 * calculated by not multiplying the baud by 16) as it
631 * is easy enough to recalculate.
632 */
633
634 quot = div / 16;
635 baud = rate / div;
636 } else {
637 quot = (rate + (8 * req_baud)) / (16 * req_baud);
638 baud = rate / (quot * 16);
639 }
640 quot--;
641
642 calc_deviation = req_baud - baud;
643 if (calc_deviation < 0)
644 calc_deviation = -calc_deviation;
645
646 if (calc_deviation < deviation) {
647 *best_clk = clk;
648 best_quot = quot;
649 *clk_num = cnt;
650 deviation = calc_deviation;
651 }
652 }
653
654 return best_quot;
655 }
656
657 /* udivslot_table[]
658 *
659 * This table takes the fractional value of the baud divisor and gives
660 * the recommended setting for the UDIVSLOT register.
661 */
662 static u16 udivslot_table[16] = {
663 [0] = 0x0000,
664 [1] = 0x0080,
665 [2] = 0x0808,
666 [3] = 0x0888,
667 [4] = 0x2222,
668 [5] = 0x4924,
669 [6] = 0x4A52,
670 [7] = 0x54AA,
671 [8] = 0x5555,
672 [9] = 0xD555,
673 [10] = 0xD5D5,
674 [11] = 0xDDD5,
675 [12] = 0xDDDD,
676 [13] = 0xDFDD,
677 [14] = 0xDFDF,
678 [15] = 0xFFDF,
679 };
680
681 static void s3c24xx_serial_set_termios(struct uart_port *port,
682 struct ktermios *termios,
683 struct ktermios *old)
684 {
685 struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
686 struct s3c24xx_uart_port *ourport = to_ourport(port);
687 struct clk *clk = NULL;
688 unsigned long flags;
689 unsigned int baud, quot, clk_sel = 0;
690 unsigned int ulcon;
691 unsigned int umcon;
692 unsigned int udivslot = 0;
693
694 /*
695 * We don't support modem control lines.
696 */
697 termios->c_cflag &= ~(HUPCL | CMSPAR);
698 termios->c_cflag |= CLOCAL;
699
700 /*
701 * Ask the core to calculate the divisor for us.
702 */
703
704 baud = uart_get_baud_rate(port, termios, old, 0, 115200*8);
705 quot = s3c24xx_serial_getclk(ourport, baud, &clk, &clk_sel);
706 if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
707 quot = port->custom_divisor;
708 if (!clk)
709 return;
710
711 /* check to see if we need to change clock source */
712
713 if (ourport->baudclk != clk) {
714 s3c24xx_serial_setsource(port, clk_sel);
715
716 if (ourport->baudclk != NULL && !IS_ERR(ourport->baudclk)) {
717 clk_disable(ourport->baudclk);
718 ourport->baudclk = NULL;
719 }
720
721 clk_enable(clk);
722
723 ourport->baudclk = clk;
724 ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0;
725 }
726
727 if (ourport->info->has_divslot) {
728 unsigned int div = ourport->baudclk_rate / baud;
729
730 if (cfg->has_fracval) {
731 udivslot = (div & 15);
732 dbg("fracval = %04x\n", udivslot);
733 } else {
734 udivslot = udivslot_table[div & 15];
735 dbg("udivslot = %04x (div %d)\n", udivslot, div & 15);
736 }
737 }
738
739 switch (termios->c_cflag & CSIZE) {
740 case CS5:
741 dbg("config: 5bits/char\n");
742 ulcon = S3C2410_LCON_CS5;
743 break;
744 case CS6:
745 dbg("config: 6bits/char\n");
746 ulcon = S3C2410_LCON_CS6;
747 break;
748 case CS7:
749 dbg("config: 7bits/char\n");
750 ulcon = S3C2410_LCON_CS7;
751 break;
752 case CS8:
753 default:
754 dbg("config: 8bits/char\n");
755 ulcon = S3C2410_LCON_CS8;
756 break;
757 }
758
759 /* preserve original lcon IR settings */
760 ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
761
762 if (termios->c_cflag & CSTOPB)
763 ulcon |= S3C2410_LCON_STOPB;
764
765 umcon = (termios->c_cflag & CRTSCTS) ? S3C2410_UMCOM_AFC : 0;
766
767 if (termios->c_cflag & PARENB) {
768 if (termios->c_cflag & PARODD)
769 ulcon |= S3C2410_LCON_PODD;
770 else
771 ulcon |= S3C2410_LCON_PEVEN;
772 } else {
773 ulcon |= S3C2410_LCON_PNONE;
774 }
775
776 spin_lock_irqsave(&port->lock, flags);
777
778 dbg("setting ulcon to %08x, brddiv to %d, udivslot %08x\n",
779 ulcon, quot, udivslot);
780
781 wr_regl(port, S3C2410_ULCON, ulcon);
782 wr_regl(port, S3C2410_UBRDIV, quot);
783 wr_regl(port, S3C2410_UMCON, umcon);
784
785 if (ourport->info->has_divslot)
786 wr_regl(port, S3C2443_DIVSLOT, udivslot);
787
788 dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
789 rd_regl(port, S3C2410_ULCON),
790 rd_regl(port, S3C2410_UCON),
791 rd_regl(port, S3C2410_UFCON));
792
793 /*
794 * Update the per-port timeout.
795 */
796 uart_update_timeout(port, termios->c_cflag, baud);
797
798 /*
799 * Which character status flags are we interested in?
800 */
801 port->read_status_mask = S3C2410_UERSTAT_OVERRUN;
802 if (termios->c_iflag & INPCK)
803 port->read_status_mask |= S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_PARITY;
804
805 /*
806 * Which character status flags should we ignore?
807 */
808 port->ignore_status_mask = 0;
809 if (termios->c_iflag & IGNPAR)
810 port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN;
811 if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
812 port->ignore_status_mask |= S3C2410_UERSTAT_FRAME;
813
814 /*
815 * Ignore all characters if CREAD is not set.
816 */
817 if ((termios->c_cflag & CREAD) == 0)
818 port->ignore_status_mask |= RXSTAT_DUMMY_READ;
819
820 spin_unlock_irqrestore(&port->lock, flags);
821 }
822
823 static const char *s3c24xx_serial_type(struct uart_port *port)
824 {
825 switch (port->type) {
826 case PORT_S3C2410:
827 return "S3C2410";
828 case PORT_S3C2440:
829 return "S3C2440";
830 case PORT_S3C2412:
831 return "S3C2412";
832 case PORT_S3C6400:
833 return "S3C6400/10";
834 default:
835 return NULL;
836 }
837 }
838
839 #define MAP_SIZE (0x100)
840
841 static void s3c24xx_serial_release_port(struct uart_port *port)
842 {
843 release_mem_region(port->mapbase, MAP_SIZE);
844 }
845
846 static int s3c24xx_serial_request_port(struct uart_port *port)
847 {
848 const char *name = s3c24xx_serial_portname(port);
849 return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY;
850 }
851
852 static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
853 {
854 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
855
856 if (flags & UART_CONFIG_TYPE &&
857 s3c24xx_serial_request_port(port) == 0)
858 port->type = info->type;
859 }
860
861 /*
862 * verify the new serial_struct (for TIOCSSERIAL).
863 */
864 static int
865 s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
866 {
867 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
868
869 if (ser->type != PORT_UNKNOWN && ser->type != info->type)
870 return -EINVAL;
871
872 return 0;
873 }
874
875
876 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
877
878 static struct console s3c24xx_serial_console;
879
880 #define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
881 #else
882 #define S3C24XX_SERIAL_CONSOLE NULL
883 #endif
884
885 static struct uart_ops s3c24xx_serial_ops = {
886 .pm = s3c24xx_serial_pm,
887 .tx_empty = s3c24xx_serial_tx_empty,
888 .get_mctrl = s3c24xx_serial_get_mctrl,
889 .set_mctrl = s3c24xx_serial_set_mctrl,
890 .stop_tx = s3c24xx_serial_stop_tx,
891 .start_tx = s3c24xx_serial_start_tx,
892 .stop_rx = s3c24xx_serial_stop_rx,
893 .enable_ms = s3c24xx_serial_enable_ms,
894 .break_ctl = s3c24xx_serial_break_ctl,
895 .startup = s3c24xx_serial_startup,
896 .shutdown = s3c24xx_serial_shutdown,
897 .set_termios = s3c24xx_serial_set_termios,
898 .type = s3c24xx_serial_type,
899 .release_port = s3c24xx_serial_release_port,
900 .request_port = s3c24xx_serial_request_port,
901 .config_port = s3c24xx_serial_config_port,
902 .verify_port = s3c24xx_serial_verify_port,
903 };
904
905 static struct uart_driver s3c24xx_uart_drv = {
906 .owner = THIS_MODULE,
907 .driver_name = "s3c2410_serial",
908 .nr = CONFIG_SERIAL_SAMSUNG_UARTS,
909 .cons = S3C24XX_SERIAL_CONSOLE,
910 .dev_name = S3C24XX_SERIAL_NAME,
911 .major = S3C24XX_SERIAL_MAJOR,
912 .minor = S3C24XX_SERIAL_MINOR,
913 };
914
915 static struct s3c24xx_uart_port s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = {
916 [0] = {
917 .port = {
918 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[0].port.lock),
919 .iotype = UPIO_MEM,
920 .uartclk = 0,
921 .fifosize = 16,
922 .ops = &s3c24xx_serial_ops,
923 .flags = UPF_BOOT_AUTOCONF,
924 .line = 0,
925 }
926 },
927 [1] = {
928 .port = {
929 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[1].port.lock),
930 .iotype = UPIO_MEM,
931 .uartclk = 0,
932 .fifosize = 16,
933 .ops = &s3c24xx_serial_ops,
934 .flags = UPF_BOOT_AUTOCONF,
935 .line = 1,
936 }
937 },
938 #if CONFIG_SERIAL_SAMSUNG_UARTS > 2
939
940 [2] = {
941 .port = {
942 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[2].port.lock),
943 .iotype = UPIO_MEM,
944 .uartclk = 0,
945 .fifosize = 16,
946 .ops = &s3c24xx_serial_ops,
947 .flags = UPF_BOOT_AUTOCONF,
948 .line = 2,
949 }
950 },
951 #endif
952 #if CONFIG_SERIAL_SAMSUNG_UARTS > 3
953 [3] = {
954 .port = {
955 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[3].port.lock),
956 .iotype = UPIO_MEM,
957 .uartclk = 0,
958 .fifosize = 16,
959 .ops = &s3c24xx_serial_ops,
960 .flags = UPF_BOOT_AUTOCONF,
961 .line = 3,
962 }
963 }
964 #endif
965 };
966
967 /* s3c24xx_serial_resetport
968 *
969 * reset the fifos and other the settings.
970 */
971
972 static void s3c24xx_serial_resetport(struct uart_port *port,
973 struct s3c2410_uartcfg *cfg)
974 {
975 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
976 unsigned long ucon = rd_regl(port, S3C2410_UCON);
977 unsigned int ucon_mask;
978
979 ucon_mask = info->clksel_mask;
980 if (info->type == PORT_S3C2440)
981 ucon_mask |= S3C2440_UCON0_DIVMASK;
982
983 ucon &= ucon_mask;
984 wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
985 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
986
987 /* reset both fifos */
988 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
989 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
990
991 /* some delay is required after fifo reset */
992 udelay(1);
993 }
994
995
996 #ifdef CONFIG_CPU_FREQ
997
998 static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb,
999 unsigned long val, void *data)
1000 {
1001 struct s3c24xx_uart_port *port;
1002 struct uart_port *uport;
1003
1004 port = container_of(nb, struct s3c24xx_uart_port, freq_transition);
1005 uport = &port->port;
1006
1007 /* check to see if port is enabled */
1008
1009 if (port->pm_level != 0)
1010 return 0;
1011
1012 /* try and work out if the baudrate is changing, we can detect
1013 * a change in rate, but we do not have support for detecting
1014 * a disturbance in the clock-rate over the change.
1015 */
1016
1017 if (IS_ERR(port->clk))
1018 goto exit;
1019
1020 if (port->baudclk_rate == clk_get_rate(port->clk))
1021 goto exit;
1022
1023 if (val == CPUFREQ_PRECHANGE) {
1024 /* we should really shut the port down whilst the
1025 * frequency change is in progress. */
1026
1027 } else if (val == CPUFREQ_POSTCHANGE) {
1028 struct ktermios *termios;
1029 struct tty_struct *tty;
1030
1031 if (uport->state == NULL)
1032 goto exit;
1033
1034 tty = uport->state->port.tty;
1035
1036 if (tty == NULL)
1037 goto exit;
1038
1039 termios = tty->termios;
1040
1041 if (termios == NULL) {
1042 printk(KERN_WARNING "%s: no termios?\n", __func__);
1043 goto exit;
1044 }
1045
1046 s3c24xx_serial_set_termios(uport, termios, NULL);
1047 }
1048
1049 exit:
1050 return 0;
1051 }
1052
1053 static inline int s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1054 {
1055 port->freq_transition.notifier_call = s3c24xx_serial_cpufreq_transition;
1056
1057 return cpufreq_register_notifier(&port->freq_transition,
1058 CPUFREQ_TRANSITION_NOTIFIER);
1059 }
1060
1061 static inline void s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1062 {
1063 cpufreq_unregister_notifier(&port->freq_transition,
1064 CPUFREQ_TRANSITION_NOTIFIER);
1065 }
1066
1067 #else
1068 static inline int s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1069 {
1070 return 0;
1071 }
1072
1073 static inline void s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1074 {
1075 }
1076 #endif
1077
1078 /* s3c24xx_serial_init_port
1079 *
1080 * initialise a single serial port from the platform device given
1081 */
1082
1083 static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
1084 struct platform_device *platdev)
1085 {
1086 struct uart_port *port = &ourport->port;
1087 struct s3c2410_uartcfg *cfg = ourport->cfg;
1088 struct resource *res;
1089 int ret;
1090
1091 dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev);
1092
1093 if (platdev == NULL)
1094 return -ENODEV;
1095
1096 if (port->mapbase != 0)
1097 return 0;
1098
1099 /* setup info for port */
1100 port->dev = &platdev->dev;
1101
1102 /* Startup sequence is different for s3c64xx and higher SoC's */
1103 if (s3c24xx_serial_has_interrupt_mask(port))
1104 s3c24xx_serial_ops.startup = s3c64xx_serial_startup;
1105
1106 port->uartclk = 1;
1107
1108 if (cfg->uart_flags & UPF_CONS_FLOW) {
1109 dbg("s3c24xx_serial_init_port: enabling flow control\n");
1110 port->flags |= UPF_CONS_FLOW;
1111 }
1112
1113 /* sort our the physical and virtual addresses for each UART */
1114
1115 res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
1116 if (res == NULL) {
1117 printk(KERN_ERR "failed to find memory resource for uart\n");
1118 return -EINVAL;
1119 }
1120
1121 dbg("resource %p (%lx..%lx)\n", res, res->start, res->end);
1122
1123 port->mapbase = res->start;
1124 port->membase = S3C_VA_UART + (res->start & 0xfffff);
1125 ret = platform_get_irq(platdev, 0);
1126 if (ret < 0)
1127 port->irq = 0;
1128 else {
1129 port->irq = ret;
1130 ourport->rx_irq = ret;
1131 ourport->tx_irq = ret + 1;
1132 }
1133
1134 ret = platform_get_irq(platdev, 1);
1135 if (ret > 0)
1136 ourport->tx_irq = ret;
1137
1138 ourport->clk = clk_get(&platdev->dev, "uart");
1139
1140 /* Keep all interrupts masked and cleared */
1141 if (s3c24xx_serial_has_interrupt_mask(port)) {
1142 wr_regl(port, S3C64XX_UINTM, 0xf);
1143 wr_regl(port, S3C64XX_UINTP, 0xf);
1144 wr_regl(port, S3C64XX_UINTSP, 0xf);
1145 }
1146
1147 dbg("port: map=%08x, mem=%08x, irq=%d (%d,%d), clock=%ld\n",
1148 port->mapbase, port->membase, port->irq,
1149 ourport->rx_irq, ourport->tx_irq, port->uartclk);
1150
1151 /* reset the fifos (and setup the uart) */
1152 s3c24xx_serial_resetport(port, cfg);
1153 return 0;
1154 }
1155
1156 static ssize_t s3c24xx_serial_show_clksrc(struct device *dev,
1157 struct device_attribute *attr,
1158 char *buf)
1159 {
1160 struct uart_port *port = s3c24xx_dev_to_port(dev);
1161 struct s3c24xx_uart_port *ourport = to_ourport(port);
1162
1163 return snprintf(buf, PAGE_SIZE, "* %s\n", ourport->baudclk->name);
1164 }
1165
1166 static DEVICE_ATTR(clock_source, S_IRUGO, s3c24xx_serial_show_clksrc, NULL);
1167
1168
1169 /* Device driver serial port probe */
1170
1171 static const struct of_device_id s3c24xx_uart_dt_match[];
1172 static int probe_index;
1173
1174 static inline struct s3c24xx_serial_drv_data *s3c24xx_get_driver_data(
1175 struct platform_device *pdev)
1176 {
1177 #ifdef CONFIG_OF
1178 if (pdev->dev.of_node) {
1179 const struct of_device_id *match;
1180 match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node);
1181 return (struct s3c24xx_serial_drv_data *)match->data;
1182 }
1183 #endif
1184 return (struct s3c24xx_serial_drv_data *)
1185 platform_get_device_id(pdev)->driver_data;
1186 }
1187
1188 static int s3c24xx_serial_probe(struct platform_device *pdev)
1189 {
1190 struct s3c24xx_uart_port *ourport;
1191 int ret;
1192
1193 dbg("s3c24xx_serial_probe(%p) %d\n", pdev, probe_index);
1194
1195 ourport = &s3c24xx_serial_ports[probe_index];
1196
1197 ourport->drv_data = s3c24xx_get_driver_data(pdev);
1198 if (!ourport->drv_data) {
1199 dev_err(&pdev->dev, "could not find driver data\n");
1200 return -ENODEV;
1201 }
1202
1203 ourport->info = ourport->drv_data->info;
1204 ourport->cfg = (pdev->dev.platform_data) ?
1205 (struct s3c2410_uartcfg *)pdev->dev.platform_data :
1206 ourport->drv_data->def_cfg;
1207
1208 ourport->port.fifosize = (ourport->info->fifosize) ?
1209 ourport->info->fifosize :
1210 ourport->drv_data->fifosize[probe_index];
1211
1212 probe_index++;
1213
1214 dbg("%s: initialising port %p...\n", __func__, ourport);
1215
1216 ret = s3c24xx_serial_init_port(ourport, pdev);
1217 if (ret < 0)
1218 goto probe_err;
1219
1220 dbg("%s: adding port\n", __func__);
1221 uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
1222 platform_set_drvdata(pdev, &ourport->port);
1223
1224 ret = device_create_file(&pdev->dev, &dev_attr_clock_source);
1225 if (ret < 0)
1226 dev_err(&pdev->dev, "failed to add clock source attr.\n");
1227
1228 ret = s3c24xx_serial_cpufreq_register(ourport);
1229 if (ret < 0)
1230 dev_err(&pdev->dev, "failed to add cpufreq notifier\n");
1231
1232 return 0;
1233
1234 probe_err:
1235 return ret;
1236 }
1237
1238 static int __devexit s3c24xx_serial_remove(struct platform_device *dev)
1239 {
1240 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1241
1242 if (port) {
1243 s3c24xx_serial_cpufreq_deregister(to_ourport(port));
1244 device_remove_file(&dev->dev, &dev_attr_clock_source);
1245 uart_remove_one_port(&s3c24xx_uart_drv, port);
1246 }
1247
1248 return 0;
1249 }
1250
1251 /* UART power management code */
1252 #ifdef CONFIG_PM_SLEEP
1253 static int s3c24xx_serial_suspend(struct device *dev)
1254 {
1255 struct uart_port *port = s3c24xx_dev_to_port(dev);
1256
1257 if (port)
1258 uart_suspend_port(&s3c24xx_uart_drv, port);
1259
1260 return 0;
1261 }
1262
1263 static int s3c24xx_serial_resume(struct device *dev)
1264 {
1265 struct uart_port *port = s3c24xx_dev_to_port(dev);
1266 struct s3c24xx_uart_port *ourport = to_ourport(port);
1267
1268 if (port) {
1269 clk_enable(ourport->clk);
1270 s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
1271 clk_disable(ourport->clk);
1272
1273 uart_resume_port(&s3c24xx_uart_drv, port);
1274 }
1275
1276 return 0;
1277 }
1278
1279 static const struct dev_pm_ops s3c24xx_serial_pm_ops = {
1280 .suspend = s3c24xx_serial_suspend,
1281 .resume = s3c24xx_serial_resume,
1282 };
1283 #define SERIAL_SAMSUNG_PM_OPS (&s3c24xx_serial_pm_ops)
1284
1285 #else /* !CONFIG_PM_SLEEP */
1286
1287 #define SERIAL_SAMSUNG_PM_OPS NULL
1288 #endif /* CONFIG_PM_SLEEP */
1289
1290 /* Console code */
1291
1292 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
1293
1294 static struct uart_port *cons_uart;
1295
1296 static int
1297 s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
1298 {
1299 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1300 unsigned long ufstat, utrstat;
1301
1302 if (ufcon & S3C2410_UFCON_FIFOMODE) {
1303 /* fifo mode - check amount of data in fifo registers... */
1304
1305 ufstat = rd_regl(port, S3C2410_UFSTAT);
1306 return (ufstat & info->tx_fifofull) ? 0 : 1;
1307 }
1308
1309 /* in non-fifo mode, we go and use the tx buffer empty */
1310
1311 utrstat = rd_regl(port, S3C2410_UTRSTAT);
1312 return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
1313 }
1314
1315 static void
1316 s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
1317 {
1318 unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON);
1319 while (!s3c24xx_serial_console_txrdy(port, ufcon))
1320 barrier();
1321 wr_regb(cons_uart, S3C2410_UTXH, ch);
1322 }
1323
1324 static void
1325 s3c24xx_serial_console_write(struct console *co, const char *s,
1326 unsigned int count)
1327 {
1328 uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
1329 }
1330
1331 static void __init
1332 s3c24xx_serial_get_options(struct uart_port *port, int *baud,
1333 int *parity, int *bits)
1334 {
1335 struct clk *clk;
1336 unsigned int ulcon;
1337 unsigned int ucon;
1338 unsigned int ubrdiv;
1339 unsigned long rate;
1340 unsigned int clk_sel;
1341 char clk_name[MAX_CLK_NAME_LENGTH];
1342
1343 ulcon = rd_regl(port, S3C2410_ULCON);
1344 ucon = rd_regl(port, S3C2410_UCON);
1345 ubrdiv = rd_regl(port, S3C2410_UBRDIV);
1346
1347 dbg("s3c24xx_serial_get_options: port=%p\n"
1348 "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
1349 port, ulcon, ucon, ubrdiv);
1350
1351 if ((ucon & 0xf) != 0) {
1352 /* consider the serial port configured if the tx/rx mode set */
1353
1354 switch (ulcon & S3C2410_LCON_CSMASK) {
1355 case S3C2410_LCON_CS5:
1356 *bits = 5;
1357 break;
1358 case S3C2410_LCON_CS6:
1359 *bits = 6;
1360 break;
1361 case S3C2410_LCON_CS7:
1362 *bits = 7;
1363 break;
1364 default:
1365 case S3C2410_LCON_CS8:
1366 *bits = 8;
1367 break;
1368 }
1369
1370 switch (ulcon & S3C2410_LCON_PMASK) {
1371 case S3C2410_LCON_PEVEN:
1372 *parity = 'e';
1373 break;
1374
1375 case S3C2410_LCON_PODD:
1376 *parity = 'o';
1377 break;
1378
1379 case S3C2410_LCON_PNONE:
1380 default:
1381 *parity = 'n';
1382 }
1383
1384 /* now calculate the baud rate */
1385
1386 clk_sel = s3c24xx_serial_getsource(port);
1387 sprintf(clk_name, "clk_uart_baud%d", clk_sel);
1388
1389 clk = clk_get(port->dev, clk_name);
1390 if (!IS_ERR(clk) && clk != NULL)
1391 rate = clk_get_rate(clk);
1392 else
1393 rate = 1;
1394
1395 *baud = rate / (16 * (ubrdiv + 1));
1396 dbg("calculated baud %d\n", *baud);
1397 }
1398
1399 }
1400
1401 static int __init
1402 s3c24xx_serial_console_setup(struct console *co, char *options)
1403 {
1404 struct uart_port *port;
1405 int baud = 9600;
1406 int bits = 8;
1407 int parity = 'n';
1408 int flow = 'n';
1409
1410 dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n",
1411 co, co->index, options);
1412
1413 /* is this a valid port */
1414
1415 if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS)
1416 co->index = 0;
1417
1418 port = &s3c24xx_serial_ports[co->index].port;
1419
1420 /* is the port configured? */
1421
1422 if (port->mapbase == 0x0)
1423 return -ENODEV;
1424
1425 cons_uart = port;
1426
1427 dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index);
1428
1429 /*
1430 * Check whether an invalid uart number has been specified, and
1431 * if so, search for the first available port that does have
1432 * console support.
1433 */
1434 if (options)
1435 uart_parse_options(options, &baud, &parity, &bits, &flow);
1436 else
1437 s3c24xx_serial_get_options(port, &baud, &parity, &bits);
1438
1439 dbg("s3c24xx_serial_console_setup: baud %d\n", baud);
1440
1441 return uart_set_options(port, co, baud, parity, bits, flow);
1442 }
1443
1444 static struct console s3c24xx_serial_console = {
1445 .name = S3C24XX_SERIAL_NAME,
1446 .device = uart_console_device,
1447 .flags = CON_PRINTBUFFER,
1448 .index = -1,
1449 .write = s3c24xx_serial_console_write,
1450 .setup = s3c24xx_serial_console_setup,
1451 .data = &s3c24xx_uart_drv,
1452 };
1453 #endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */
1454
1455 #ifdef CONFIG_CPU_S3C2410
1456 static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = {
1457 .info = &(struct s3c24xx_uart_info) {
1458 .name = "Samsung S3C2410 UART",
1459 .type = PORT_S3C2410,
1460 .fifosize = 16,
1461 .rx_fifomask = S3C2410_UFSTAT_RXMASK,
1462 .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
1463 .rx_fifofull = S3C2410_UFSTAT_RXFULL,
1464 .tx_fifofull = S3C2410_UFSTAT_TXFULL,
1465 .tx_fifomask = S3C2410_UFSTAT_TXMASK,
1466 .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
1467 .def_clk_sel = S3C2410_UCON_CLKSEL0,
1468 .num_clks = 2,
1469 .clksel_mask = S3C2410_UCON_CLKMASK,
1470 .clksel_shift = S3C2410_UCON_CLKSHIFT,
1471 },
1472 .def_cfg = &(struct s3c2410_uartcfg) {
1473 .ucon = S3C2410_UCON_DEFAULT,
1474 .ufcon = S3C2410_UFCON_DEFAULT,
1475 },
1476 };
1477 #define S3C2410_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2410_serial_drv_data)
1478 #else
1479 #define S3C2410_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1480 #endif
1481
1482 #ifdef CONFIG_CPU_S3C2412
1483 static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = {
1484 .info = &(struct s3c24xx_uart_info) {
1485 .name = "Samsung S3C2412 UART",
1486 .type = PORT_S3C2412,
1487 .fifosize = 64,
1488 .has_divslot = 1,
1489 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1490 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1491 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1492 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1493 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1494 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1495 .def_clk_sel = S3C2410_UCON_CLKSEL2,
1496 .num_clks = 4,
1497 .clksel_mask = S3C2412_UCON_CLKMASK,
1498 .clksel_shift = S3C2412_UCON_CLKSHIFT,
1499 },
1500 .def_cfg = &(struct s3c2410_uartcfg) {
1501 .ucon = S3C2410_UCON_DEFAULT,
1502 .ufcon = S3C2410_UFCON_DEFAULT,
1503 },
1504 };
1505 #define S3C2412_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2412_serial_drv_data)
1506 #else
1507 #define S3C2412_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1508 #endif
1509
1510 #if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2416) || \
1511 defined(CONFIG_CPU_S3C2443) || defined(CONFIG_CPU_S3C2442)
1512 static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
1513 .info = &(struct s3c24xx_uart_info) {
1514 .name = "Samsung S3C2440 UART",
1515 .type = PORT_S3C2440,
1516 .fifosize = 64,
1517 .has_divslot = 1,
1518 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1519 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1520 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1521 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1522 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1523 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1524 .def_clk_sel = S3C2410_UCON_CLKSEL2,
1525 .num_clks = 4,
1526 .clksel_mask = S3C2412_UCON_CLKMASK,
1527 .clksel_shift = S3C2412_UCON_CLKSHIFT,
1528 },
1529 .def_cfg = &(struct s3c2410_uartcfg) {
1530 .ucon = S3C2410_UCON_DEFAULT,
1531 .ufcon = S3C2410_UFCON_DEFAULT,
1532 },
1533 };
1534 #define S3C2440_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2440_serial_drv_data)
1535 #else
1536 #define S3C2440_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1537 #endif
1538
1539 #if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410) || \
1540 defined(CONFIG_CPU_S5P6440) || defined(CONFIG_CPU_S5P6450) || \
1541 defined(CONFIG_CPU_S5PC100)
1542 static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
1543 .info = &(struct s3c24xx_uart_info) {
1544 .name = "Samsung S3C6400 UART",
1545 .type = PORT_S3C6400,
1546 .fifosize = 64,
1547 .has_divslot = 1,
1548 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1549 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1550 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1551 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1552 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1553 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1554 .def_clk_sel = S3C2410_UCON_CLKSEL2,
1555 .num_clks = 4,
1556 .clksel_mask = S3C6400_UCON_CLKMASK,
1557 .clksel_shift = S3C6400_UCON_CLKSHIFT,
1558 },
1559 .def_cfg = &(struct s3c2410_uartcfg) {
1560 .ucon = S3C2410_UCON_DEFAULT,
1561 .ufcon = S3C2410_UFCON_DEFAULT,
1562 },
1563 };
1564 #define S3C6400_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c6400_serial_drv_data)
1565 #else
1566 #define S3C6400_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1567 #endif
1568
1569 #ifdef CONFIG_CPU_S5PV210
1570 static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
1571 .info = &(struct s3c24xx_uart_info) {
1572 .name = "Samsung S5PV210 UART",
1573 .type = PORT_S3C6400,
1574 .has_divslot = 1,
1575 .rx_fifomask = S5PV210_UFSTAT_RXMASK,
1576 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT,
1577 .rx_fifofull = S5PV210_UFSTAT_RXFULL,
1578 .tx_fifofull = S5PV210_UFSTAT_TXFULL,
1579 .tx_fifomask = S5PV210_UFSTAT_TXMASK,
1580 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT,
1581 .def_clk_sel = S3C2410_UCON_CLKSEL0,
1582 .num_clks = 2,
1583 .clksel_mask = S5PV210_UCON_CLKMASK,
1584 .clksel_shift = S5PV210_UCON_CLKSHIFT,
1585 },
1586 .def_cfg = &(struct s3c2410_uartcfg) {
1587 .ucon = S5PV210_UCON_DEFAULT,
1588 .ufcon = S5PV210_UFCON_DEFAULT,
1589 },
1590 .fifosize = { 256, 64, 16, 16 },
1591 };
1592 #define S5PV210_SERIAL_DRV_DATA ((kernel_ulong_t)&s5pv210_serial_drv_data)
1593 #else
1594 #define S5PV210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1595 #endif
1596
1597 #if defined(CONFIG_CPU_EXYNOS4210) || defined(CONFIG_SOC_EXYNOS4212) || \
1598 defined(CONFIG_SOC_EXYNOS4412) || defined(CONFIG_SOC_EXYNOS5250)
1599 static struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = {
1600 .info = &(struct s3c24xx_uart_info) {
1601 .name = "Samsung Exynos4 UART",
1602 .type = PORT_S3C6400,
1603 .has_divslot = 1,
1604 .rx_fifomask = S5PV210_UFSTAT_RXMASK,
1605 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT,
1606 .rx_fifofull = S5PV210_UFSTAT_RXFULL,
1607 .tx_fifofull = S5PV210_UFSTAT_TXFULL,
1608 .tx_fifomask = S5PV210_UFSTAT_TXMASK,
1609 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT,
1610 .def_clk_sel = S3C2410_UCON_CLKSEL0,
1611 .num_clks = 1,
1612 .clksel_mask = 0,
1613 .clksel_shift = 0,
1614 },
1615 .def_cfg = &(struct s3c2410_uartcfg) {
1616 .ucon = S5PV210_UCON_DEFAULT,
1617 .ufcon = S5PV210_UFCON_DEFAULT,
1618 .has_fracval = 1,
1619 },
1620 .fifosize = { 256, 64, 16, 16 },
1621 };
1622 #define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos4210_serial_drv_data)
1623 #else
1624 #define EXYNOS4210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1625 #endif
1626
1627 static struct platform_device_id s3c24xx_serial_driver_ids[] = {
1628 {
1629 .name = "s3c2410-uart",
1630 .driver_data = S3C2410_SERIAL_DRV_DATA,
1631 }, {
1632 .name = "s3c2412-uart",
1633 .driver_data = S3C2412_SERIAL_DRV_DATA,
1634 }, {
1635 .name = "s3c2440-uart",
1636 .driver_data = S3C2440_SERIAL_DRV_DATA,
1637 }, {
1638 .name = "s3c6400-uart",
1639 .driver_data = S3C6400_SERIAL_DRV_DATA,
1640 }, {
1641 .name = "s5pv210-uart",
1642 .driver_data = S5PV210_SERIAL_DRV_DATA,
1643 }, {
1644 .name = "exynos4210-uart",
1645 .driver_data = EXYNOS4210_SERIAL_DRV_DATA,
1646 },
1647 { },
1648 };
1649 MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids);
1650
1651 #ifdef CONFIG_OF
1652 static const struct of_device_id s3c24xx_uart_dt_match[] = {
1653 { .compatible = "samsung,exynos4210-uart",
1654 .data = (void *)EXYNOS4210_SERIAL_DRV_DATA },
1655 {},
1656 };
1657 MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match);
1658 #else
1659 #define s3c24xx_uart_dt_match NULL
1660 #endif
1661
1662 static struct platform_driver samsung_serial_driver = {
1663 .probe = s3c24xx_serial_probe,
1664 .remove = __devexit_p(s3c24xx_serial_remove),
1665 .id_table = s3c24xx_serial_driver_ids,
1666 .driver = {
1667 .name = "samsung-uart",
1668 .owner = THIS_MODULE,
1669 .pm = SERIAL_SAMSUNG_PM_OPS,
1670 .of_match_table = s3c24xx_uart_dt_match,
1671 },
1672 };
1673
1674 /* module initialisation code */
1675
1676 static int __init s3c24xx_serial_modinit(void)
1677 {
1678 int ret;
1679
1680 ret = uart_register_driver(&s3c24xx_uart_drv);
1681 if (ret < 0) {
1682 printk(KERN_ERR "failed to register UART driver\n");
1683 return -1;
1684 }
1685
1686 return platform_driver_register(&samsung_serial_driver);
1687 }
1688
1689 static void __exit s3c24xx_serial_modexit(void)
1690 {
1691 uart_unregister_driver(&s3c24xx_uart_drv);
1692 }
1693
1694 module_init(s3c24xx_serial_modinit);
1695 module_exit(s3c24xx_serial_modexit);
1696
1697 MODULE_ALIAS("platform:samsung-uart");
1698 MODULE_DESCRIPTION("Samsung SoC Serial port driver");
1699 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
1700 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support