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
to_ourport(struct uart_port * port)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
s3c24xx_serial_portname(struct uart_port * port)78 static inline const char *s3c24xx_serial_portname(struct uart_port *port)
79 {
80 return to_platform_device(port->dev)->name;
81 }
82
s3c24xx_serial_txempty_nofifo(struct uart_port * port)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 */
s3c24xx_serial_has_interrupt_mask(struct uart_port * port)93 static int s3c24xx_serial_has_interrupt_mask(struct uart_port *port)
94 {
95 return to_ourport(port)->info->type == PORT_S3C6400;
96 }
97
s3c24xx_serial_rx_enable(struct uart_port * port)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
s3c24xx_serial_rx_disable(struct uart_port * port)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
s3c24xx_serial_stop_tx(struct uart_port * port)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
s3c24xx_serial_start_tx(struct uart_port * port)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
s3c24xx_serial_stop_rx(struct uart_port * port)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
s3c24xx_serial_enable_ms(struct uart_port * port)184 static void s3c24xx_serial_enable_ms(struct uart_port *port)
185 {
186 }
187
s3c24xx_port_to_info(struct uart_port * port)188 static inline struct s3c24xx_uart_info *s3c24xx_port_to_info(struct uart_port *port)
189 {
190 return to_ourport(port)->info;
191 }
192
s3c24xx_port_to_cfg(struct uart_port * port)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
s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port * ourport,unsigned long ufstat)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
s3c24xx_serial_rx_chars(int irq,void * dev_id)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
s3c24xx_serial_tx_chars(int irq,void * id)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.*/
s3c64xx_serial_handle_irq(int irq,void * id)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
s3c24xx_serial_tx_empty(struct uart_port * port)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 */
s3c24xx_serial_get_mctrl(struct uart_port * port)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
s3c24xx_serial_set_mctrl(struct uart_port * port,unsigned int mctrl)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
s3c24xx_serial_break_ctl(struct uart_port * port,int break_state)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
s3c24xx_serial_shutdown(struct uart_port * port)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
s3c24xx_serial_startup(struct uart_port * port)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
s3c64xx_serial_startup(struct uart_port * port)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
s3c24xx_serial_pm(struct uart_port * port,unsigned int level,unsigned int old)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
s3c24xx_serial_getsource(struct uart_port * port)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
s3c24xx_serial_setsource(struct uart_port * port,unsigned int clk_sel)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
s3c24xx_serial_getclk(struct s3c24xx_uart_port * ourport,unsigned int req_baud,struct clk ** best_clk,unsigned int * clk_num)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
s3c24xx_serial_set_termios(struct uart_port * port,struct ktermios * termios,struct ktermios * old)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
s3c24xx_serial_type(struct uart_port * port)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
s3c24xx_serial_release_port(struct uart_port * port)841 static void s3c24xx_serial_release_port(struct uart_port *port)
842 {
843 release_mem_region(port->mapbase, MAP_SIZE);
844 }
845
s3c24xx_serial_request_port(struct uart_port * port)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
s3c24xx_serial_config_port(struct uart_port * port,int flags)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
s3c24xx_serial_verify_port(struct uart_port * port,struct serial_struct * ser)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
s3c24xx_serial_resetport(struct uart_port * port,struct s3c2410_uartcfg * cfg)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
986 /* reset both fifos */
987 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
988 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
989
990 /* some delay is required after fifo reset */
991 udelay(1);
992 }
993
994
995 #ifdef CONFIG_CPU_FREQ
996
s3c24xx_serial_cpufreq_transition(struct notifier_block * nb,unsigned long val,void * data)997 static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb,
998 unsigned long val, void *data)
999 {
1000 struct s3c24xx_uart_port *port;
1001 struct uart_port *uport;
1002
1003 port = container_of(nb, struct s3c24xx_uart_port, freq_transition);
1004 uport = &port->port;
1005
1006 /* check to see if port is enabled */
1007
1008 if (port->pm_level != 0)
1009 return 0;
1010
1011 /* try and work out if the baudrate is changing, we can detect
1012 * a change in rate, but we do not have support for detecting
1013 * a disturbance in the clock-rate over the change.
1014 */
1015
1016 if (IS_ERR(port->clk))
1017 goto exit;
1018
1019 if (port->baudclk_rate == clk_get_rate(port->clk))
1020 goto exit;
1021
1022 if (val == CPUFREQ_PRECHANGE) {
1023 /* we should really shut the port down whilst the
1024 * frequency change is in progress. */
1025
1026 } else if (val == CPUFREQ_POSTCHANGE) {
1027 struct ktermios *termios;
1028 struct tty_struct *tty;
1029
1030 if (uport->state == NULL)
1031 goto exit;
1032
1033 tty = uport->state->port.tty;
1034
1035 if (tty == NULL)
1036 goto exit;
1037
1038 termios = tty->termios;
1039
1040 if (termios == NULL) {
1041 printk(KERN_WARNING "%s: no termios?\n", __func__);
1042 goto exit;
1043 }
1044
1045 s3c24xx_serial_set_termios(uport, termios, NULL);
1046 }
1047
1048 exit:
1049 return 0;
1050 }
1051
s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port * port)1052 static inline int s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1053 {
1054 port->freq_transition.notifier_call = s3c24xx_serial_cpufreq_transition;
1055
1056 return cpufreq_register_notifier(&port->freq_transition,
1057 CPUFREQ_TRANSITION_NOTIFIER);
1058 }
1059
s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port * port)1060 static inline void s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1061 {
1062 cpufreq_unregister_notifier(&port->freq_transition,
1063 CPUFREQ_TRANSITION_NOTIFIER);
1064 }
1065
1066 #else
s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port * port)1067 static inline int s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
1068 {
1069 return 0;
1070 }
1071
s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port * port)1072 static inline void s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
1073 {
1074 }
1075 #endif
1076
1077 /* s3c24xx_serial_init_port
1078 *
1079 * initialise a single serial port from the platform device given
1080 */
1081
s3c24xx_serial_init_port(struct s3c24xx_uart_port * ourport,struct platform_device * platdev)1082 static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
1083 struct platform_device *platdev)
1084 {
1085 struct uart_port *port = &ourport->port;
1086 struct s3c2410_uartcfg *cfg = ourport->cfg;
1087 struct resource *res;
1088 int ret;
1089
1090 dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev);
1091
1092 if (platdev == NULL)
1093 return -ENODEV;
1094
1095 if (port->mapbase != 0)
1096 return 0;
1097
1098 /* setup info for port */
1099 port->dev = &platdev->dev;
1100
1101 /* Startup sequence is different for s3c64xx and higher SoC's */
1102 if (s3c24xx_serial_has_interrupt_mask(port))
1103 s3c24xx_serial_ops.startup = s3c64xx_serial_startup;
1104
1105 port->uartclk = 1;
1106
1107 if (cfg->uart_flags & UPF_CONS_FLOW) {
1108 dbg("s3c24xx_serial_init_port: enabling flow control\n");
1109 port->flags |= UPF_CONS_FLOW;
1110 }
1111
1112 /* sort our the physical and virtual addresses for each UART */
1113
1114 res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
1115 if (res == NULL) {
1116 printk(KERN_ERR "failed to find memory resource for uart\n");
1117 return -EINVAL;
1118 }
1119
1120 dbg("resource %p (%lx..%lx)\n", res, res->start, res->end);
1121
1122 port->mapbase = res->start;
1123 port->membase = S3C_VA_UART + (res->start & 0xfffff);
1124 ret = platform_get_irq(platdev, 0);
1125 if (ret < 0)
1126 port->irq = 0;
1127 else {
1128 port->irq = ret;
1129 ourport->rx_irq = ret;
1130 ourport->tx_irq = ret + 1;
1131 }
1132
1133 ret = platform_get_irq(platdev, 1);
1134 if (ret > 0)
1135 ourport->tx_irq = ret;
1136
1137 ourport->clk = clk_get(&platdev->dev, "uart");
1138
1139 /* Keep all interrupts masked and cleared */
1140 if (s3c24xx_serial_has_interrupt_mask(port)) {
1141 wr_regl(port, S3C64XX_UINTM, 0xf);
1142 wr_regl(port, S3C64XX_UINTP, 0xf);
1143 wr_regl(port, S3C64XX_UINTSP, 0xf);
1144 }
1145
1146 dbg("port: map=%08x, mem=%08x, irq=%d (%d,%d), clock=%ld\n",
1147 port->mapbase, port->membase, port->irq,
1148 ourport->rx_irq, ourport->tx_irq, port->uartclk);
1149
1150 /* reset the fifos (and setup the uart) */
1151 s3c24xx_serial_resetport(port, cfg);
1152 return 0;
1153 }
1154
s3c24xx_serial_show_clksrc(struct device * dev,struct device_attribute * attr,char * buf)1155 static ssize_t s3c24xx_serial_show_clksrc(struct device *dev,
1156 struct device_attribute *attr,
1157 char *buf)
1158 {
1159 struct uart_port *port = s3c24xx_dev_to_port(dev);
1160 struct s3c24xx_uart_port *ourport = to_ourport(port);
1161
1162 return snprintf(buf, PAGE_SIZE, "* %s\n", ourport->baudclk->name);
1163 }
1164
1165 static DEVICE_ATTR(clock_source, S_IRUGO, s3c24xx_serial_show_clksrc, NULL);
1166
1167
1168 /* Device driver serial port probe */
1169
1170 static const struct of_device_id s3c24xx_uart_dt_match[];
1171 static int probe_index;
1172
s3c24xx_get_driver_data(struct platform_device * pdev)1173 static inline struct s3c24xx_serial_drv_data *s3c24xx_get_driver_data(
1174 struct platform_device *pdev)
1175 {
1176 #ifdef CONFIG_OF
1177 if (pdev->dev.of_node) {
1178 const struct of_device_id *match;
1179 match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node);
1180 return (struct s3c24xx_serial_drv_data *)match->data;
1181 }
1182 #endif
1183 return (struct s3c24xx_serial_drv_data *)
1184 platform_get_device_id(pdev)->driver_data;
1185 }
1186
s3c24xx_serial_probe(struct platform_device * pdev)1187 static int s3c24xx_serial_probe(struct platform_device *pdev)
1188 {
1189 struct s3c24xx_uart_port *ourport;
1190 int ret;
1191
1192 dbg("s3c24xx_serial_probe(%p) %d\n", pdev, probe_index);
1193
1194 ourport = &s3c24xx_serial_ports[probe_index];
1195
1196 ourport->drv_data = s3c24xx_get_driver_data(pdev);
1197 if (!ourport->drv_data) {
1198 dev_err(&pdev->dev, "could not find driver data\n");
1199 return -ENODEV;
1200 }
1201
1202 ourport->info = ourport->drv_data->info;
1203 ourport->cfg = (pdev->dev.platform_data) ?
1204 (struct s3c2410_uartcfg *)pdev->dev.platform_data :
1205 ourport->drv_data->def_cfg;
1206
1207 ourport->port.fifosize = (ourport->info->fifosize) ?
1208 ourport->info->fifosize :
1209 ourport->drv_data->fifosize[probe_index];
1210
1211 probe_index++;
1212
1213 dbg("%s: initialising port %p...\n", __func__, ourport);
1214
1215 ret = s3c24xx_serial_init_port(ourport, pdev);
1216 if (ret < 0)
1217 goto probe_err;
1218
1219 dbg("%s: adding port\n", __func__);
1220 uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
1221 platform_set_drvdata(pdev, &ourport->port);
1222
1223 ret = device_create_file(&pdev->dev, &dev_attr_clock_source);
1224 if (ret < 0)
1225 dev_err(&pdev->dev, "failed to add clock source attr.\n");
1226
1227 ret = s3c24xx_serial_cpufreq_register(ourport);
1228 if (ret < 0)
1229 dev_err(&pdev->dev, "failed to add cpufreq notifier\n");
1230
1231 return 0;
1232
1233 probe_err:
1234 return ret;
1235 }
1236
s3c24xx_serial_remove(struct platform_device * dev)1237 static int __devexit s3c24xx_serial_remove(struct platform_device *dev)
1238 {
1239 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1240
1241 if (port) {
1242 s3c24xx_serial_cpufreq_deregister(to_ourport(port));
1243 device_remove_file(&dev->dev, &dev_attr_clock_source);
1244 uart_remove_one_port(&s3c24xx_uart_drv, port);
1245 }
1246
1247 return 0;
1248 }
1249
1250 /* UART power management code */
1251 #ifdef CONFIG_PM_SLEEP
s3c24xx_serial_suspend(struct device * dev)1252 static int s3c24xx_serial_suspend(struct device *dev)
1253 {
1254 struct uart_port *port = s3c24xx_dev_to_port(dev);
1255
1256 if (port)
1257 uart_suspend_port(&s3c24xx_uart_drv, port);
1258
1259 return 0;
1260 }
1261
s3c24xx_serial_resume(struct device * dev)1262 static int s3c24xx_serial_resume(struct device *dev)
1263 {
1264 struct uart_port *port = s3c24xx_dev_to_port(dev);
1265 struct s3c24xx_uart_port *ourport = to_ourport(port);
1266
1267 if (port) {
1268 clk_enable(ourport->clk);
1269 s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
1270 clk_disable(ourport->clk);
1271
1272 uart_resume_port(&s3c24xx_uart_drv, port);
1273 }
1274
1275 return 0;
1276 }
1277
1278 static const struct dev_pm_ops s3c24xx_serial_pm_ops = {
1279 .suspend = s3c24xx_serial_suspend,
1280 .resume = s3c24xx_serial_resume,
1281 };
1282 #define SERIAL_SAMSUNG_PM_OPS (&s3c24xx_serial_pm_ops)
1283
1284 #else /* !CONFIG_PM_SLEEP */
1285
1286 #define SERIAL_SAMSUNG_PM_OPS NULL
1287 #endif /* CONFIG_PM_SLEEP */
1288
1289 /* Console code */
1290
1291 #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
1292
1293 static struct uart_port *cons_uart;
1294
1295 static int
s3c24xx_serial_console_txrdy(struct uart_port * port,unsigned int ufcon)1296 s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
1297 {
1298 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1299 unsigned long ufstat, utrstat;
1300
1301 if (ufcon & S3C2410_UFCON_FIFOMODE) {
1302 /* fifo mode - check amount of data in fifo registers... */
1303
1304 ufstat = rd_regl(port, S3C2410_UFSTAT);
1305 return (ufstat & info->tx_fifofull) ? 0 : 1;
1306 }
1307
1308 /* in non-fifo mode, we go and use the tx buffer empty */
1309
1310 utrstat = rd_regl(port, S3C2410_UTRSTAT);
1311 return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
1312 }
1313
1314 static void
s3c24xx_serial_console_putchar(struct uart_port * port,int ch)1315 s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
1316 {
1317 unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON);
1318 while (!s3c24xx_serial_console_txrdy(port, ufcon))
1319 barrier();
1320 wr_regb(cons_uart, S3C2410_UTXH, ch);
1321 }
1322
1323 static void
s3c24xx_serial_console_write(struct console * co,const char * s,unsigned int count)1324 s3c24xx_serial_console_write(struct console *co, const char *s,
1325 unsigned int count)
1326 {
1327 uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
1328 }
1329
1330 static void __init
s3c24xx_serial_get_options(struct uart_port * port,int * baud,int * parity,int * bits)1331 s3c24xx_serial_get_options(struct uart_port *port, int *baud,
1332 int *parity, int *bits)
1333 {
1334 struct clk *clk;
1335 unsigned int ulcon;
1336 unsigned int ucon;
1337 unsigned int ubrdiv;
1338 unsigned long rate;
1339 unsigned int clk_sel;
1340 char clk_name[MAX_CLK_NAME_LENGTH];
1341
1342 ulcon = rd_regl(port, S3C2410_ULCON);
1343 ucon = rd_regl(port, S3C2410_UCON);
1344 ubrdiv = rd_regl(port, S3C2410_UBRDIV);
1345
1346 dbg("s3c24xx_serial_get_options: port=%p\n"
1347 "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
1348 port, ulcon, ucon, ubrdiv);
1349
1350 if ((ucon & 0xf) != 0) {
1351 /* consider the serial port configured if the tx/rx mode set */
1352
1353 switch (ulcon & S3C2410_LCON_CSMASK) {
1354 case S3C2410_LCON_CS5:
1355 *bits = 5;
1356 break;
1357 case S3C2410_LCON_CS6:
1358 *bits = 6;
1359 break;
1360 case S3C2410_LCON_CS7:
1361 *bits = 7;
1362 break;
1363 default:
1364 case S3C2410_LCON_CS8:
1365 *bits = 8;
1366 break;
1367 }
1368
1369 switch (ulcon & S3C2410_LCON_PMASK) {
1370 case S3C2410_LCON_PEVEN:
1371 *parity = 'e';
1372 break;
1373
1374 case S3C2410_LCON_PODD:
1375 *parity = 'o';
1376 break;
1377
1378 case S3C2410_LCON_PNONE:
1379 default:
1380 *parity = 'n';
1381 }
1382
1383 /* now calculate the baud rate */
1384
1385 clk_sel = s3c24xx_serial_getsource(port);
1386 sprintf(clk_name, "clk_uart_baud%d", clk_sel);
1387
1388 clk = clk_get(port->dev, clk_name);
1389 if (!IS_ERR(clk) && clk != NULL)
1390 rate = clk_get_rate(clk);
1391 else
1392 rate = 1;
1393
1394 *baud = rate / (16 * (ubrdiv + 1));
1395 dbg("calculated baud %d\n", *baud);
1396 }
1397
1398 }
1399
1400 static int __init
s3c24xx_serial_console_setup(struct console * co,char * options)1401 s3c24xx_serial_console_setup(struct console *co, char *options)
1402 {
1403 struct uart_port *port;
1404 int baud = 9600;
1405 int bits = 8;
1406 int parity = 'n';
1407 int flow = 'n';
1408
1409 dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n",
1410 co, co->index, options);
1411
1412 /* is this a valid port */
1413
1414 if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS)
1415 co->index = 0;
1416
1417 port = &s3c24xx_serial_ports[co->index].port;
1418
1419 /* is the port configured? */
1420
1421 if (port->mapbase == 0x0)
1422 return -ENODEV;
1423
1424 cons_uart = port;
1425
1426 dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index);
1427
1428 /*
1429 * Check whether an invalid uart number has been specified, and
1430 * if so, search for the first available port that does have
1431 * console support.
1432 */
1433 if (options)
1434 uart_parse_options(options, &baud, &parity, &bits, &flow);
1435 else
1436 s3c24xx_serial_get_options(port, &baud, &parity, &bits);
1437
1438 dbg("s3c24xx_serial_console_setup: baud %d\n", baud);
1439
1440 return uart_set_options(port, co, baud, parity, bits, flow);
1441 }
1442
1443 static struct console s3c24xx_serial_console = {
1444 .name = S3C24XX_SERIAL_NAME,
1445 .device = uart_console_device,
1446 .flags = CON_PRINTBUFFER,
1447 .index = -1,
1448 .write = s3c24xx_serial_console_write,
1449 .setup = s3c24xx_serial_console_setup,
1450 .data = &s3c24xx_uart_drv,
1451 };
1452 #endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */
1453
1454 #ifdef CONFIG_CPU_S3C2410
1455 static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = {
1456 .info = &(struct s3c24xx_uart_info) {
1457 .name = "Samsung S3C2410 UART",
1458 .type = PORT_S3C2410,
1459 .fifosize = 16,
1460 .rx_fifomask = S3C2410_UFSTAT_RXMASK,
1461 .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
1462 .rx_fifofull = S3C2410_UFSTAT_RXFULL,
1463 .tx_fifofull = S3C2410_UFSTAT_TXFULL,
1464 .tx_fifomask = S3C2410_UFSTAT_TXMASK,
1465 .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
1466 .def_clk_sel = S3C2410_UCON_CLKSEL0,
1467 .num_clks = 2,
1468 .clksel_mask = S3C2410_UCON_CLKMASK,
1469 .clksel_shift = S3C2410_UCON_CLKSHIFT,
1470 },
1471 .def_cfg = &(struct s3c2410_uartcfg) {
1472 .ucon = S3C2410_UCON_DEFAULT,
1473 .ufcon = S3C2410_UFCON_DEFAULT,
1474 },
1475 };
1476 #define S3C2410_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2410_serial_drv_data)
1477 #else
1478 #define S3C2410_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1479 #endif
1480
1481 #ifdef CONFIG_CPU_S3C2412
1482 static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = {
1483 .info = &(struct s3c24xx_uart_info) {
1484 .name = "Samsung S3C2412 UART",
1485 .type = PORT_S3C2412,
1486 .fifosize = 64,
1487 .has_divslot = 1,
1488 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1489 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1490 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1491 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1492 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1493 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1494 .def_clk_sel = S3C2410_UCON_CLKSEL2,
1495 .num_clks = 4,
1496 .clksel_mask = S3C2412_UCON_CLKMASK,
1497 .clksel_shift = S3C2412_UCON_CLKSHIFT,
1498 },
1499 .def_cfg = &(struct s3c2410_uartcfg) {
1500 .ucon = S3C2410_UCON_DEFAULT,
1501 .ufcon = S3C2410_UFCON_DEFAULT,
1502 },
1503 };
1504 #define S3C2412_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2412_serial_drv_data)
1505 #else
1506 #define S3C2412_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1507 #endif
1508
1509 #if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2416) || \
1510 defined(CONFIG_CPU_S3C2443)
1511 static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
1512 .info = &(struct s3c24xx_uart_info) {
1513 .name = "Samsung S3C2440 UART",
1514 .type = PORT_S3C2440,
1515 .fifosize = 64,
1516 .has_divslot = 1,
1517 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1518 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1519 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1520 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1521 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1522 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1523 .def_clk_sel = S3C2410_UCON_CLKSEL2,
1524 .num_clks = 4,
1525 .clksel_mask = S3C2412_UCON_CLKMASK,
1526 .clksel_shift = S3C2412_UCON_CLKSHIFT,
1527 },
1528 .def_cfg = &(struct s3c2410_uartcfg) {
1529 .ucon = S3C2410_UCON_DEFAULT,
1530 .ufcon = S3C2410_UFCON_DEFAULT,
1531 },
1532 };
1533 #define S3C2440_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2440_serial_drv_data)
1534 #else
1535 #define S3C2440_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1536 #endif
1537
1538 #if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410) || \
1539 defined(CONFIG_CPU_S5P6440) || defined(CONFIG_CPU_S5P6450) || \
1540 defined(CONFIG_CPU_S5PC100)
1541 static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
1542 .info = &(struct s3c24xx_uart_info) {
1543 .name = "Samsung S3C6400 UART",
1544 .type = PORT_S3C6400,
1545 .fifosize = 64,
1546 .has_divslot = 1,
1547 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1548 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1549 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1550 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1551 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1552 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1553 .def_clk_sel = S3C2410_UCON_CLKSEL2,
1554 .num_clks = 4,
1555 .clksel_mask = S3C6400_UCON_CLKMASK,
1556 .clksel_shift = S3C6400_UCON_CLKSHIFT,
1557 },
1558 .def_cfg = &(struct s3c2410_uartcfg) {
1559 .ucon = S3C2410_UCON_DEFAULT,
1560 .ufcon = S3C2410_UFCON_DEFAULT,
1561 },
1562 };
1563 #define S3C6400_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c6400_serial_drv_data)
1564 #else
1565 #define S3C6400_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1566 #endif
1567
1568 #ifdef CONFIG_CPU_S5PV210
1569 static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
1570 .info = &(struct s3c24xx_uart_info) {
1571 .name = "Samsung S5PV210 UART",
1572 .type = PORT_S3C6400,
1573 .has_divslot = 1,
1574 .rx_fifomask = S5PV210_UFSTAT_RXMASK,
1575 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT,
1576 .rx_fifofull = S5PV210_UFSTAT_RXFULL,
1577 .tx_fifofull = S5PV210_UFSTAT_TXFULL,
1578 .tx_fifomask = S5PV210_UFSTAT_TXMASK,
1579 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT,
1580 .def_clk_sel = S3C2410_UCON_CLKSEL0,
1581 .num_clks = 2,
1582 .clksel_mask = S5PV210_UCON_CLKMASK,
1583 .clksel_shift = S5PV210_UCON_CLKSHIFT,
1584 },
1585 .def_cfg = &(struct s3c2410_uartcfg) {
1586 .ucon = S5PV210_UCON_DEFAULT,
1587 .ufcon = S5PV210_UFCON_DEFAULT,
1588 },
1589 .fifosize = { 256, 64, 16, 16 },
1590 };
1591 #define S5PV210_SERIAL_DRV_DATA ((kernel_ulong_t)&s5pv210_serial_drv_data)
1592 #else
1593 #define S5PV210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1594 #endif
1595
1596 #if defined(CONFIG_CPU_EXYNOS4210) || defined(CONFIG_SOC_EXYNOS4212) || \
1597 defined(CONFIG_SOC_EXYNOS4412) || defined(CONFIG_SOC_EXYNOS5250)
1598 static struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = {
1599 .info = &(struct s3c24xx_uart_info) {
1600 .name = "Samsung Exynos4 UART",
1601 .type = PORT_S3C6400,
1602 .has_divslot = 1,
1603 .rx_fifomask = S5PV210_UFSTAT_RXMASK,
1604 .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT,
1605 .rx_fifofull = S5PV210_UFSTAT_RXFULL,
1606 .tx_fifofull = S5PV210_UFSTAT_TXFULL,
1607 .tx_fifomask = S5PV210_UFSTAT_TXMASK,
1608 .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT,
1609 .def_clk_sel = S3C2410_UCON_CLKSEL0,
1610 .num_clks = 1,
1611 .clksel_mask = 0,
1612 .clksel_shift = 0,
1613 },
1614 .def_cfg = &(struct s3c2410_uartcfg) {
1615 .ucon = S5PV210_UCON_DEFAULT,
1616 .ufcon = S5PV210_UFCON_DEFAULT,
1617 .has_fracval = 1,
1618 },
1619 .fifosize = { 256, 64, 16, 16 },
1620 };
1621 #define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos4210_serial_drv_data)
1622 #else
1623 #define EXYNOS4210_SERIAL_DRV_DATA (kernel_ulong_t)NULL
1624 #endif
1625
1626 static struct platform_device_id s3c24xx_serial_driver_ids[] = {
1627 {
1628 .name = "s3c2410-uart",
1629 .driver_data = S3C2410_SERIAL_DRV_DATA,
1630 }, {
1631 .name = "s3c2412-uart",
1632 .driver_data = S3C2412_SERIAL_DRV_DATA,
1633 }, {
1634 .name = "s3c2440-uart",
1635 .driver_data = S3C2440_SERIAL_DRV_DATA,
1636 }, {
1637 .name = "s3c6400-uart",
1638 .driver_data = S3C6400_SERIAL_DRV_DATA,
1639 }, {
1640 .name = "s5pv210-uart",
1641 .driver_data = S5PV210_SERIAL_DRV_DATA,
1642 }, {
1643 .name = "exynos4210-uart",
1644 .driver_data = EXYNOS4210_SERIAL_DRV_DATA,
1645 },
1646 { },
1647 };
1648 MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids);
1649
1650 #ifdef CONFIG_OF
1651 static const struct of_device_id s3c24xx_uart_dt_match[] = {
1652 { .compatible = "samsung,exynos4210-uart",
1653 .data = (void *)EXYNOS4210_SERIAL_DRV_DATA },
1654 {},
1655 };
1656 MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match);
1657 #else
1658 #define s3c24xx_uart_dt_match NULL
1659 #endif
1660
1661 static struct platform_driver samsung_serial_driver = {
1662 .probe = s3c24xx_serial_probe,
1663 .remove = __devexit_p(s3c24xx_serial_remove),
1664 .id_table = s3c24xx_serial_driver_ids,
1665 .driver = {
1666 .name = "samsung-uart",
1667 .owner = THIS_MODULE,
1668 .pm = SERIAL_SAMSUNG_PM_OPS,
1669 .of_match_table = s3c24xx_uart_dt_match,
1670 },
1671 };
1672
1673 /* module initialisation code */
1674
s3c24xx_serial_modinit(void)1675 static int __init s3c24xx_serial_modinit(void)
1676 {
1677 int ret;
1678
1679 ret = uart_register_driver(&s3c24xx_uart_drv);
1680 if (ret < 0) {
1681 printk(KERN_ERR "failed to register UART driver\n");
1682 return -1;
1683 }
1684
1685 return platform_driver_register(&samsung_serial_driver);
1686 }
1687
s3c24xx_serial_modexit(void)1688 static void __exit s3c24xx_serial_modexit(void)
1689 {
1690 uart_unregister_driver(&s3c24xx_uart_drv);
1691 }
1692
1693 module_init(s3c24xx_serial_modinit);
1694 module_exit(s3c24xx_serial_modexit);
1695
1696 MODULE_ALIAS("platform:samsung-uart");
1697 MODULE_DESCRIPTION("Samsung SoC Serial port driver");
1698 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
1699 MODULE_LICENSE("GPL v2");
1700