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[ARM] 5050/1: S3C2410: Cleanup header on S3C2410 serial driver
[linux-2.6/linux-2.6-openrd.git] / drivers / serial / s3c2410.c
blobc32cf93d7a43a7a4103922b7fa727479e838fb83
1 /* linux/drivers/serial/s3c2410.c
2 *
3 * Driver for Samsung SoC onboard UARTs.
4 *
5 * Ben Dooks, Copyright (c) 2003-2005 Simtec Electronics
6 * http://armlinux.simtec.co.uk/
7 */
8
9 /* Note on 2440 fclk clock source handling
10 *
11 * Whilst it is possible to use the fclk as clock source, the method
12 * of properly switching too/from this is currently un-implemented, so
13 * whichever way is configured at startup is the one that will be used.
14 */
15
16 /* Hote on 2410 error handling
17 *
18 * The s3c2410 manual has a love/hate affair with the contents of the
19 * UERSTAT register in the UART blocks, and keeps marking some of the
20 * error bits as reserved. Having checked with the s3c2410x01,
21 * it copes with BREAKs properly, so I am happy to ignore the RESERVED
22 * feature from the latter versions of the manual.
23 *
24 * If it becomes aparrent that latter versions of the 2410 remove these
25 * bits, then action will have to be taken to differentiate the versions
26 * and change the policy on BREAK
27 *
28 * BJD, 04-Nov-2004
29 */
30
31
32 #if defined(CONFIG_SERIAL_S3C2410_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
33 #define SUPPORT_SYSRQ
34 #endif
35
36 #include <linux/module.h>
37 #include <linux/ioport.h>
38 #include <linux/platform_device.h>
39 #include <linux/init.h>
40 #include <linux/sysrq.h>
41 #include <linux/console.h>
42 #include <linux/tty.h>
43 #include <linux/tty_flip.h>
44 #include <linux/serial_core.h>
45 #include <linux/serial.h>
46 #include <linux/delay.h>
47 #include <linux/clk.h>
48
49 #include <asm/io.h>
50 #include <asm/irq.h>
51
52 #include <asm/hardware.h>
53
54 #include <asm/plat-s3c/regs-serial.h>
55 #include <asm/arch/regs-gpio.h>
56
57 /* structures */
58
59 struct s3c24xx_uart_info {
60 char *name;
61 unsigned int type;
62 unsigned int fifosize;
63 unsigned long rx_fifomask;
64 unsigned long rx_fifoshift;
65 unsigned long rx_fifofull;
66 unsigned long tx_fifomask;
67 unsigned long tx_fifoshift;
68 unsigned long tx_fifofull;
69
70 /* clock source control */
71
72 int (*get_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk);
73 int (*set_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk);
74
75 /* uart controls */
76 int (*reset_port)(struct uart_port *, struct s3c2410_uartcfg *);
77 };
78
79 struct s3c24xx_uart_port {
80 unsigned char rx_claimed;
81 unsigned char tx_claimed;
82
83 struct s3c24xx_uart_info *info;
84 struct s3c24xx_uart_clksrc *clksrc;
85 struct clk *clk;
86 struct clk *baudclk;
87 struct uart_port port;
88 };
89
90
91 /* configuration defines */
92
93 #if 0
94 #if 1
95 /* send debug to the low-level output routines */
96
97 extern void printascii(const char *);
98
99 static void
100 s3c24xx_serial_dbg(const char *fmt, ...)
101 {
102 va_list va;
103 char buff[256];
104
105 va_start(va, fmt);
106 vsprintf(buff, fmt, va);
107 va_end(va);
108
109 printascii(buff);
110 }
111
112 #define dbg(x...) s3c24xx_serial_dbg(x)
113
114 #else
115 #define dbg(x...) printk(KERN_DEBUG "s3c24xx: ");
116 #endif
117 #else /* no debug */
118 #define dbg(x...) do {} while(0)
119 #endif
120
121 /* UART name and device definitions */
122
123 #define S3C24XX_SERIAL_NAME "ttySAC"
124 #define S3C24XX_SERIAL_MAJOR 204
125 #define S3C24XX_SERIAL_MINOR 64
126
127
128 /* conversion functions */
129
130 #define s3c24xx_dev_to_port(__dev) (struct uart_port *)dev_get_drvdata(__dev)
131 #define s3c24xx_dev_to_cfg(__dev) (struct s3c2410_uartcfg *)((__dev)->platform_data)
132
133 /* we can support 3 uarts, but not always use them */
134
135 #ifdef CONFIG_CPU_S3C2400
136 #define NR_PORTS (2)
137 #else
138 #define NR_PORTS (3)
139 #endif
140
141 /* port irq numbers */
142
143 #define TX_IRQ(port) ((port)->irq + 1)
144 #define RX_IRQ(port) ((port)->irq)
145
146 /* register access controls */
147
148 #define portaddr(port, reg) ((port)->membase + (reg))
149
150 #define rd_regb(port, reg) (__raw_readb(portaddr(port, reg)))
151 #define rd_regl(port, reg) (__raw_readl(portaddr(port, reg)))
152
153 #define wr_regb(port, reg, val) \
154 do { __raw_writeb(val, portaddr(port, reg)); } while(0)
155
156 #define wr_regl(port, reg, val) \
157 do { __raw_writel(val, portaddr(port, reg)); } while(0)
158
159 /* macros to change one thing to another */
160
161 #define tx_enabled(port) ((port)->unused[0])
162 #define rx_enabled(port) ((port)->unused[1])
163
164 /* flag to ignore all characters comming in */
165 #define RXSTAT_DUMMY_READ (0x10000000)
166
167 static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port)
168 {
169 return container_of(port, struct s3c24xx_uart_port, port);
170 }
171
172 /* translate a port to the device name */
173
174 static inline const char *s3c24xx_serial_portname(struct uart_port *port)
175 {
176 return to_platform_device(port->dev)->name;
177 }
178
179 static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
180 {
181 return (rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE);
182 }
183
184 static void s3c24xx_serial_rx_enable(struct uart_port *port)
185 {
186 unsigned long flags;
187 unsigned int ucon, ufcon;
188 int count = 10000;
189
190 spin_lock_irqsave(&port->lock, flags);
191
192 while (--count && !s3c24xx_serial_txempty_nofifo(port))
193 udelay(100);
194
195 ufcon = rd_regl(port, S3C2410_UFCON);
196 ufcon |= S3C2410_UFCON_RESETRX;
197 wr_regl(port, S3C2410_UFCON, ufcon);
198
199 ucon = rd_regl(port, S3C2410_UCON);
200 ucon |= S3C2410_UCON_RXIRQMODE;
201 wr_regl(port, S3C2410_UCON, ucon);
202
203 rx_enabled(port) = 1;
204 spin_unlock_irqrestore(&port->lock, flags);
205 }
206
207 static void s3c24xx_serial_rx_disable(struct uart_port *port)
208 {
209 unsigned long flags;
210 unsigned int ucon;
211
212 spin_lock_irqsave(&port->lock, flags);
213
214 ucon = rd_regl(port, S3C2410_UCON);
215 ucon &= ~S3C2410_UCON_RXIRQMODE;
216 wr_regl(port, S3C2410_UCON, ucon);
217
218 rx_enabled(port) = 0;
219 spin_unlock_irqrestore(&port->lock, flags);
220 }
221
222 static void s3c24xx_serial_stop_tx(struct uart_port *port)
223 {
224 if (tx_enabled(port)) {
225 disable_irq(TX_IRQ(port));
226 tx_enabled(port) = 0;
227 if (port->flags & UPF_CONS_FLOW)
228 s3c24xx_serial_rx_enable(port);
229 }
230 }
231
232 static void s3c24xx_serial_start_tx(struct uart_port *port)
233 {
234 if (!tx_enabled(port)) {
235 if (port->flags & UPF_CONS_FLOW)
236 s3c24xx_serial_rx_disable(port);
237
238 enable_irq(TX_IRQ(port));
239 tx_enabled(port) = 1;
240 }
241 }
242
243
244 static void s3c24xx_serial_stop_rx(struct uart_port *port)
245 {
246 if (rx_enabled(port)) {
247 dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
248 disable_irq(RX_IRQ(port));
249 rx_enabled(port) = 0;
250 }
251 }
252
253 static void s3c24xx_serial_enable_ms(struct uart_port *port)
254 {
255 }
256
257 static inline struct s3c24xx_uart_info *s3c24xx_port_to_info(struct uart_port *port)
258 {
259 return to_ourport(port)->info;
260 }
261
262 static inline struct s3c2410_uartcfg *s3c24xx_port_to_cfg(struct uart_port *port)
263 {
264 if (port->dev == NULL)
265 return NULL;
266
267 return (struct s3c2410_uartcfg *)port->dev->platform_data;
268 }
269
270 static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
271 unsigned long ufstat)
272 {
273 struct s3c24xx_uart_info *info = ourport->info;
274
275 if (ufstat & info->rx_fifofull)
276 return info->fifosize;
277
278 return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
279 }
280
281
282 /* ? - where has parity gone?? */
283 #define S3C2410_UERSTAT_PARITY (0x1000)
284
285 static irqreturn_t
286 s3c24xx_serial_rx_chars(int irq, void *dev_id)
287 {
288 struct s3c24xx_uart_port *ourport = dev_id;
289 struct uart_port *port = &ourport->port;
290 struct tty_struct *tty = port->info->tty;
291 unsigned int ufcon, ch, flag, ufstat, uerstat;
292 int max_count = 64;
293
294 while (max_count-- > 0) {
295 ufcon = rd_regl(port, S3C2410_UFCON);
296 ufstat = rd_regl(port, S3C2410_UFSTAT);
297
298 if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
299 break;
300
301 uerstat = rd_regl(port, S3C2410_UERSTAT);
302 ch = rd_regb(port, S3C2410_URXH);
303
304 if (port->flags & UPF_CONS_FLOW) {
305 int txe = s3c24xx_serial_txempty_nofifo(port);
306
307 if (rx_enabled(port)) {
308 if (!txe) {
309 rx_enabled(port) = 0;
310 continue;
311 }
312 } else {
313 if (txe) {
314 ufcon |= S3C2410_UFCON_RESETRX;
315 wr_regl(port, S3C2410_UFCON, ufcon);
316 rx_enabled(port) = 1;
317 goto out;
318 }
319 continue;
320 }
321 }
322
323 /* insert the character into the buffer */
324
325 flag = TTY_NORMAL;
326 port->icount.rx++;
327
328 if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) {
329 dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n",
330 ch, uerstat);
331
332 /* check for break */
333 if (uerstat & S3C2410_UERSTAT_BREAK) {
334 dbg("break!\n");
335 port->icount.brk++;
336 if (uart_handle_break(port))
337 goto ignore_char;
338 }
339
340 if (uerstat & S3C2410_UERSTAT_FRAME)
341 port->icount.frame++;
342 if (uerstat & S3C2410_UERSTAT_OVERRUN)
343 port->icount.overrun++;
344
345 uerstat &= port->read_status_mask;
346
347 if (uerstat & S3C2410_UERSTAT_BREAK)
348 flag = TTY_BREAK;
349 else if (uerstat & S3C2410_UERSTAT_PARITY)
350 flag = TTY_PARITY;
351 else if (uerstat & ( S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_OVERRUN))
352 flag = TTY_FRAME;
353 }
354
355 if (uart_handle_sysrq_char(port, ch))
356 goto ignore_char;
357
358 uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN, ch, flag);
359
360 ignore_char:
361 continue;
362 }
363 tty_flip_buffer_push(tty);
364
365 out:
366 return IRQ_HANDLED;
367 }
368
369 static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
370 {
371 struct s3c24xx_uart_port *ourport = id;
372 struct uart_port *port = &ourport->port;
373 struct circ_buf *xmit = &port->info->xmit;
374 int count = 256;
375
376 if (port->x_char) {
377 wr_regb(port, S3C2410_UTXH, port->x_char);
378 port->icount.tx++;
379 port->x_char = 0;
380 goto out;
381 }
382
383 /* if there isnt anything more to transmit, or the uart is now
384 * stopped, disable the uart and exit
385 */
386
387 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
388 s3c24xx_serial_stop_tx(port);
389 goto out;
390 }
391
392 /* try and drain the buffer... */
393
394 while (!uart_circ_empty(xmit) && count-- > 0) {
395 if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
396 break;
397
398 wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
399 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
400 port->icount.tx++;
401 }
402
403 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
404 uart_write_wakeup(port);
405
406 if (uart_circ_empty(xmit))
407 s3c24xx_serial_stop_tx(port);
408
409 out:
410 return IRQ_HANDLED;
411 }
412
413 static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
414 {
415 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
416 unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT);
417 unsigned long ufcon = rd_regl(port, S3C2410_UFCON);
418
419 if (ufcon & S3C2410_UFCON_FIFOMODE) {
420 if ((ufstat & info->tx_fifomask) != 0 ||
421 (ufstat & info->tx_fifofull))
422 return 0;
423
424 return 1;
425 }
426
427 return s3c24xx_serial_txempty_nofifo(port);
428 }
429
430 /* no modem control lines */
431 static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
432 {
433 unsigned int umstat = rd_regb(port,S3C2410_UMSTAT);
434
435 if (umstat & S3C2410_UMSTAT_CTS)
436 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
437 else
438 return TIOCM_CAR | TIOCM_DSR;
439 }
440
441 static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
442 {
443 /* todo - possibly remove AFC and do manual CTS */
444 }
445
446 static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
447 {
448 unsigned long flags;
449 unsigned int ucon;
450
451 spin_lock_irqsave(&port->lock, flags);
452
453 ucon = rd_regl(port, S3C2410_UCON);
454
455 if (break_state)
456 ucon |= S3C2410_UCON_SBREAK;
457 else
458 ucon &= ~S3C2410_UCON_SBREAK;
459
460 wr_regl(port, S3C2410_UCON, ucon);
461
462 spin_unlock_irqrestore(&port->lock, flags);
463 }
464
465 static void s3c24xx_serial_shutdown(struct uart_port *port)
466 {
467 struct s3c24xx_uart_port *ourport = to_ourport(port);
468
469 if (ourport->tx_claimed) {
470 free_irq(TX_IRQ(port), ourport);
471 tx_enabled(port) = 0;
472 ourport->tx_claimed = 0;
473 }
474
475 if (ourport->rx_claimed) {
476 free_irq(RX_IRQ(port), ourport);
477 ourport->rx_claimed = 0;
478 rx_enabled(port) = 0;
479 }
480 }
481
482
483 static int s3c24xx_serial_startup(struct uart_port *port)
484 {
485 struct s3c24xx_uart_port *ourport = to_ourport(port);
486 int ret;
487
488 dbg("s3c24xx_serial_startup: port=%p (%08lx,%p)\n",
489 port->mapbase, port->membase);
490
491 rx_enabled(port) = 1;
492
493 ret = request_irq(RX_IRQ(port),
494 s3c24xx_serial_rx_chars, 0,
495 s3c24xx_serial_portname(port), ourport);
496
497 if (ret != 0) {
498 printk(KERN_ERR "cannot get irq %d\n", RX_IRQ(port));
499 return ret;
500 }
501
502 ourport->rx_claimed = 1;
503
504 dbg("requesting tx irq...\n");
505
506 tx_enabled(port) = 1;
507
508 ret = request_irq(TX_IRQ(port),
509 s3c24xx_serial_tx_chars, 0,
510 s3c24xx_serial_portname(port), ourport);
511
512 if (ret) {
513 printk(KERN_ERR "cannot get irq %d\n", TX_IRQ(port));
514 goto err;
515 }
516
517 ourport->tx_claimed = 1;
518
519 dbg("s3c24xx_serial_startup ok\n");
520
521 /* the port reset code should have done the correct
522 * register setup for the port controls */
523
524 return ret;
525
526 err:
527 s3c24xx_serial_shutdown(port);
528 return ret;
529 }
530
531 /* power power management control */
532
533 static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
534 unsigned int old)
535 {
536 struct s3c24xx_uart_port *ourport = to_ourport(port);
537
538 switch (level) {
539 case 3:
540 if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL)
541 clk_disable(ourport->baudclk);
542
543 clk_disable(ourport->clk);
544 break;
545
546 case 0:
547 clk_enable(ourport->clk);
548
549 if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL)
550 clk_enable(ourport->baudclk);
551
552 break;
553 default:
554 printk(KERN_ERR "s3c24xx_serial: unknown pm %d\n", level);
555 }
556 }
557
558 /* baud rate calculation
559 *
560 * The UARTs on the S3C2410/S3C2440 can take their clocks from a number
561 * of different sources, including the peripheral clock ("pclk") and an
562 * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk")
563 * with a programmable extra divisor.
564 *
565 * The following code goes through the clock sources, and calculates the
566 * baud clocks (and the resultant actual baud rates) and then tries to
567 * pick the closest one and select that.
568 *
569 */
570
571
572 #define MAX_CLKS (8)
573
574 static struct s3c24xx_uart_clksrc tmp_clksrc = {
575 .name = "pclk",
576 .min_baud = 0,
577 .max_baud = 0,
578 .divisor = 1,
579 };
580
581 static inline int
582 s3c24xx_serial_getsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c)
583 {
584 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
585
586 return (info->get_clksrc)(port, c);
587 }
588
589 static inline int
590 s3c24xx_serial_setsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c)
591 {
592 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
593
594 return (info->set_clksrc)(port, c);
595 }
596
597 struct baud_calc {
598 struct s3c24xx_uart_clksrc *clksrc;
599 unsigned int calc;
600 unsigned int quot;
601 struct clk *src;
602 };
603
604 static int s3c24xx_serial_calcbaud(struct baud_calc *calc,
605 struct uart_port *port,
606 struct s3c24xx_uart_clksrc *clksrc,
607 unsigned int baud)
608 {
609 unsigned long rate;
610
611 calc->src = clk_get(port->dev, clksrc->name);
612 if (calc->src == NULL || IS_ERR(calc->src))
613 return 0;
614
615 rate = clk_get_rate(calc->src);
616 rate /= clksrc->divisor;
617
618 calc->clksrc = clksrc;
619 calc->quot = (rate + (8 * baud)) / (16 * baud);
620 calc->calc = (rate / (calc->quot * 16));
621
622 calc->quot--;
623 return 1;
624 }
625
626 static unsigned int s3c24xx_serial_getclk(struct uart_port *port,
627 struct s3c24xx_uart_clksrc **clksrc,
628 struct clk **clk,
629 unsigned int baud)
630 {
631 struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
632 struct s3c24xx_uart_clksrc *clkp;
633 struct baud_calc res[MAX_CLKS];
634 struct baud_calc *resptr, *best, *sptr;
635 int i;
636
637 clkp = cfg->clocks;
638 best = NULL;
639
640 if (cfg->clocks_size < 2) {
641 if (cfg->clocks_size == 0)
642 clkp = &tmp_clksrc;
643
644 /* check to see if we're sourcing fclk, and if so we're
645 * going to have to update the clock source
646 */
647
648 if (strcmp(clkp->name, "fclk") == 0) {
649 struct s3c24xx_uart_clksrc src;
650
651 s3c24xx_serial_getsource(port, &src);
652
653 /* check that the port already using fclk, and if
654 * not, then re-select fclk
655 */
656
657 if (strcmp(src.name, clkp->name) == 0) {
658 s3c24xx_serial_setsource(port, clkp);
659 s3c24xx_serial_getsource(port, &src);
660 }
661
662 clkp->divisor = src.divisor;
663 }
664
665 s3c24xx_serial_calcbaud(res, port, clkp, baud);
666 best = res;
667 resptr = best + 1;
668 } else {
669 resptr = res;
670
671 for (i = 0; i < cfg->clocks_size; i++, clkp++) {
672 if (s3c24xx_serial_calcbaud(resptr, port, clkp, baud))
673 resptr++;
674 }
675 }
676
677 /* ok, we now need to select the best clock we found */
678
679 if (!best) {
680 unsigned int deviation = (1<<30)|((1<<30)-1);
681 int calc_deviation;
682
683 for (sptr = res; sptr < resptr; sptr++) {
684 printk(KERN_DEBUG
685 "found clk %p (%s) quot %d, calc %d\n",
686 sptr->clksrc, sptr->clksrc->name,
687 sptr->quot, sptr->calc);
688
689 calc_deviation = baud - sptr->calc;
690 if (calc_deviation < 0)
691 calc_deviation = -calc_deviation;
692
693 if (calc_deviation < deviation) {
694 best = sptr;
695 deviation = calc_deviation;
696 }
697 }
698
699 printk(KERN_DEBUG "best %p (deviation %d)\n", best, deviation);
700 }
701
702 printk(KERN_DEBUG "selected clock %p (%s) quot %d, calc %d\n",
703 best->clksrc, best->clksrc->name, best->quot, best->calc);
704
705 /* store results to pass back */
706
707 *clksrc = best->clksrc;
708 *clk = best->src;
709
710 return best->quot;
711 }
712
713 static void s3c24xx_serial_set_termios(struct uart_port *port,
714 struct ktermios *termios,
715 struct ktermios *old)
716 {
717 struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
718 struct s3c24xx_uart_port *ourport = to_ourport(port);
719 struct s3c24xx_uart_clksrc *clksrc = NULL;
720 struct clk *clk = NULL;
721 unsigned long flags;
722 unsigned int baud, quot;
723 unsigned int ulcon;
724 unsigned int umcon;
725
726 /*
727 * We don't support modem control lines.
728 */
729 termios->c_cflag &= ~(HUPCL | CMSPAR);
730 termios->c_cflag |= CLOCAL;
731
732 /*
733 * Ask the core to calculate the divisor for us.
734 */
735
736 baud = uart_get_baud_rate(port, termios, old, 0, 115200*8);
737
738 if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
739 quot = port->custom_divisor;
740 else
741 quot = s3c24xx_serial_getclk(port, &clksrc, &clk, baud);
742
743 /* check to see if we need to change clock source */
744
745 if (ourport->clksrc != clksrc || ourport->baudclk != clk) {
746 s3c24xx_serial_setsource(port, clksrc);
747
748 if (ourport->baudclk != NULL && !IS_ERR(ourport->baudclk)) {
749 clk_disable(ourport->baudclk);
750 ourport->baudclk = NULL;
751 }
752
753 clk_enable(clk);
754
755 ourport->clksrc = clksrc;
756 ourport->baudclk = clk;
757 }
758
759 switch (termios->c_cflag & CSIZE) {
760 case CS5:
761 dbg("config: 5bits/char\n");
762 ulcon = S3C2410_LCON_CS5;
763 break;
764 case CS6:
765 dbg("config: 6bits/char\n");
766 ulcon = S3C2410_LCON_CS6;
767 break;
768 case CS7:
769 dbg("config: 7bits/char\n");
770 ulcon = S3C2410_LCON_CS7;
771 break;
772 case CS8:
773 default:
774 dbg("config: 8bits/char\n");
775 ulcon = S3C2410_LCON_CS8;
776 break;
777 }
778
779 /* preserve original lcon IR settings */
780 ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
781
782 if (termios->c_cflag & CSTOPB)
783 ulcon |= S3C2410_LCON_STOPB;
784
785 umcon = (termios->c_cflag & CRTSCTS) ? S3C2410_UMCOM_AFC : 0;
786
787 if (termios->c_cflag & PARENB) {
788 if (termios->c_cflag & PARODD)
789 ulcon |= S3C2410_LCON_PODD;
790 else
791 ulcon |= S3C2410_LCON_PEVEN;
792 } else {
793 ulcon |= S3C2410_LCON_PNONE;
794 }
795
796 spin_lock_irqsave(&port->lock, flags);
797
798 dbg("setting ulcon to %08x, brddiv to %d\n", ulcon, quot);
799
800 wr_regl(port, S3C2410_ULCON, ulcon);
801 wr_regl(port, S3C2410_UBRDIV, quot);
802 wr_regl(port, S3C2410_UMCON, umcon);
803
804 dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
805 rd_regl(port, S3C2410_ULCON),
806 rd_regl(port, S3C2410_UCON),
807 rd_regl(port, S3C2410_UFCON));
808
809 /*
810 * Update the per-port timeout.
811 */
812 uart_update_timeout(port, termios->c_cflag, baud);
813
814 /*
815 * Which character status flags are we interested in?
816 */
817 port->read_status_mask = S3C2410_UERSTAT_OVERRUN;
818 if (termios->c_iflag & INPCK)
819 port->read_status_mask |= S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_PARITY;
820
821 /*
822 * Which character status flags should we ignore?
823 */
824 port->ignore_status_mask = 0;
825 if (termios->c_iflag & IGNPAR)
826 port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN;
827 if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
828 port->ignore_status_mask |= S3C2410_UERSTAT_FRAME;
829
830 /*
831 * Ignore all characters if CREAD is not set.
832 */
833 if ((termios->c_cflag & CREAD) == 0)
834 port->ignore_status_mask |= RXSTAT_DUMMY_READ;
835
836 spin_unlock_irqrestore(&port->lock, flags);
837 }
838
839 static const char *s3c24xx_serial_type(struct uart_port *port)
840 {
841 switch (port->type) {
842 case PORT_S3C2410:
843 return "S3C2410";
844 case PORT_S3C2440:
845 return "S3C2440";
846 case PORT_S3C2412:
847 return "S3C2412";
848 default:
849 return NULL;
850 }
851 }
852
853 #define MAP_SIZE (0x100)
854
855 static void s3c24xx_serial_release_port(struct uart_port *port)
856 {
857 release_mem_region(port->mapbase, MAP_SIZE);
858 }
859
860 static int s3c24xx_serial_request_port(struct uart_port *port)
861 {
862 const char *name = s3c24xx_serial_portname(port);
863 return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY;
864 }
865
866 static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
867 {
868 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
869
870 if (flags & UART_CONFIG_TYPE &&
871 s3c24xx_serial_request_port(port) == 0)
872 port->type = info->type;
873 }
874
875 /*
876 * verify the new serial_struct (for TIOCSSERIAL).
877 */
878 static int
879 s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
880 {
881 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
882
883 if (ser->type != PORT_UNKNOWN && ser->type != info->type)
884 return -EINVAL;
885
886 return 0;
887 }
888
889
890 #ifdef CONFIG_SERIAL_S3C2410_CONSOLE
891
892 static struct console s3c24xx_serial_console;
893
894 #define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
895 #else
896 #define S3C24XX_SERIAL_CONSOLE NULL
897 #endif
898
899 static struct uart_ops s3c24xx_serial_ops = {
900 .pm = s3c24xx_serial_pm,
901 .tx_empty = s3c24xx_serial_tx_empty,
902 .get_mctrl = s3c24xx_serial_get_mctrl,
903 .set_mctrl = s3c24xx_serial_set_mctrl,
904 .stop_tx = s3c24xx_serial_stop_tx,
905 .start_tx = s3c24xx_serial_start_tx,
906 .stop_rx = s3c24xx_serial_stop_rx,
907 .enable_ms = s3c24xx_serial_enable_ms,
908 .break_ctl = s3c24xx_serial_break_ctl,
909 .startup = s3c24xx_serial_startup,
910 .shutdown = s3c24xx_serial_shutdown,
911 .set_termios = s3c24xx_serial_set_termios,
912 .type = s3c24xx_serial_type,
913 .release_port = s3c24xx_serial_release_port,
914 .request_port = s3c24xx_serial_request_port,
915 .config_port = s3c24xx_serial_config_port,
916 .verify_port = s3c24xx_serial_verify_port,
917 };
918
919
920 static struct uart_driver s3c24xx_uart_drv = {
921 .owner = THIS_MODULE,
922 .dev_name = "s3c2410_serial",
923 .nr = 3,
924 .cons = S3C24XX_SERIAL_CONSOLE,
925 .driver_name = S3C24XX_SERIAL_NAME,
926 .major = S3C24XX_SERIAL_MAJOR,
927 .minor = S3C24XX_SERIAL_MINOR,
928 };
929
930 static struct s3c24xx_uart_port s3c24xx_serial_ports[NR_PORTS] = {
931 [0] = {
932 .port = {
933 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[0].port.lock),
934 .iotype = UPIO_MEM,
935 .irq = IRQ_S3CUART_RX0,
936 .uartclk = 0,
937 .fifosize = 16,
938 .ops = &s3c24xx_serial_ops,
939 .flags = UPF_BOOT_AUTOCONF,
940 .line = 0,
941 }
942 },
943 [1] = {
944 .port = {
945 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[1].port.lock),
946 .iotype = UPIO_MEM,
947 .irq = IRQ_S3CUART_RX1,
948 .uartclk = 0,
949 .fifosize = 16,
950 .ops = &s3c24xx_serial_ops,
951 .flags = UPF_BOOT_AUTOCONF,
952 .line = 1,
953 }
954 },
955 #if NR_PORTS > 2
956
957 [2] = {
958 .port = {
959 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[2].port.lock),
960 .iotype = UPIO_MEM,
961 .irq = IRQ_S3CUART_RX2,
962 .uartclk = 0,
963 .fifosize = 16,
964 .ops = &s3c24xx_serial_ops,
965 .flags = UPF_BOOT_AUTOCONF,
966 .line = 2,
967 }
968 }
969 #endif
970 };
971
972 /* s3c24xx_serial_resetport
973 *
974 * wrapper to call the specific reset for this port (reset the fifos
975 * and the settings)
976 */
977
978 static inline int s3c24xx_serial_resetport(struct uart_port * port,
979 struct s3c2410_uartcfg *cfg)
980 {
981 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
982
983 return (info->reset_port)(port, cfg);
984 }
985
986 /* s3c24xx_serial_init_port
987 *
988 * initialise a single serial port from the platform device given
989 */
990
991 static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
992 struct s3c24xx_uart_info *info,
993 struct platform_device *platdev)
994 {
995 struct uart_port *port = &ourport->port;
996 struct s3c2410_uartcfg *cfg;
997 struct resource *res;
998 int ret;
999
1000 dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev);
1001
1002 if (platdev == NULL)
1003 return -ENODEV;
1004
1005 cfg = s3c24xx_dev_to_cfg(&platdev->dev);
1006
1007 if (port->mapbase != 0)
1008 return 0;
1009
1010 if (cfg->hwport > 3)
1011 return -EINVAL;
1012
1013 /* setup info for port */
1014 port->dev = &platdev->dev;
1015 ourport->info = info;
1016
1017 /* copy the info in from provided structure */
1018 ourport->port.fifosize = info->fifosize;
1019
1020 dbg("s3c24xx_serial_init_port: %p (hw %d)...\n", port, cfg->hwport);
1021
1022 port->uartclk = 1;
1023
1024 if (cfg->uart_flags & UPF_CONS_FLOW) {
1025 dbg("s3c24xx_serial_init_port: enabling flow control\n");
1026 port->flags |= UPF_CONS_FLOW;
1027 }
1028
1029 /* sort our the physical and virtual addresses for each UART */
1030
1031 res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
1032 if (res == NULL) {
1033 printk(KERN_ERR "failed to find memory resource for uart\n");
1034 return -EINVAL;
1035 }
1036
1037 dbg("resource %p (%lx..%lx)\n", res, res->start, res->end);
1038
1039 port->mapbase = res->start;
1040 port->membase = S3C24XX_VA_UART + (res->start - S3C24XX_PA_UART);
1041 ret = platform_get_irq(platdev, 0);
1042 if (ret < 0)
1043 port->irq = 0;
1044 else
1045 port->irq = ret;
1046
1047 ourport->clk = clk_get(&platdev->dev, "uart");
1048
1049 dbg("port: map=%08x, mem=%08x, irq=%d, clock=%ld\n",
1050 port->mapbase, port->membase, port->irq, port->uartclk);
1051
1052 /* reset the fifos (and setup the uart) */
1053 s3c24xx_serial_resetport(port, cfg);
1054 return 0;
1055 }
1056
1057 /* Device driver serial port probe */
1058
1059 static int probe_index = 0;
1060
1061 static int s3c24xx_serial_probe(struct platform_device *dev,
1062 struct s3c24xx_uart_info *info)
1063 {
1064 struct s3c24xx_uart_port *ourport;
1065 int ret;
1066
1067 dbg("s3c24xx_serial_probe(%p, %p) %d\n", dev, info, probe_index);
1068
1069 ourport = &s3c24xx_serial_ports[probe_index];
1070 probe_index++;
1071
1072 dbg("%s: initialising port %p...\n", __func__, ourport);
1073
1074 ret = s3c24xx_serial_init_port(ourport, info, dev);
1075 if (ret < 0)
1076 goto probe_err;
1077
1078 dbg("%s: adding port\n", __func__);
1079 uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
1080 platform_set_drvdata(dev, &ourport->port);
1081
1082 return 0;
1083
1084 probe_err:
1085 return ret;
1086 }
1087
1088 static int s3c24xx_serial_remove(struct platform_device *dev)
1089 {
1090 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1091
1092 if (port)
1093 uart_remove_one_port(&s3c24xx_uart_drv, port);
1094
1095 return 0;
1096 }
1097
1098 /* UART power management code */
1099
1100 #ifdef CONFIG_PM
1101
1102 static int s3c24xx_serial_suspend(struct platform_device *dev, pm_message_t state)
1103 {
1104 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1105
1106 if (port)
1107 uart_suspend_port(&s3c24xx_uart_drv, port);
1108
1109 return 0;
1110 }
1111
1112 static int s3c24xx_serial_resume(struct platform_device *dev)
1113 {
1114 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1115 struct s3c24xx_uart_port *ourport = to_ourport(port);
1116
1117 if (port) {
1118 clk_enable(ourport->clk);
1119 s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
1120 clk_disable(ourport->clk);
1121
1122 uart_resume_port(&s3c24xx_uart_drv, port);
1123 }
1124
1125 return 0;
1126 }
1127
1128 #else
1129 #define s3c24xx_serial_suspend NULL
1130 #define s3c24xx_serial_resume NULL
1131 #endif
1132
1133 static int s3c24xx_serial_init(struct platform_driver *drv,
1134 struct s3c24xx_uart_info *info)
1135 {
1136 dbg("s3c24xx_serial_init(%p,%p)\n", drv, info);
1137 return platform_driver_register(drv);
1138 }
1139
1140
1141 /* now comes the code to initialise either the s3c2410 or s3c2440 serial
1142 * port information
1143 */
1144
1145 /* cpu specific variations on the serial port support */
1146
1147 #ifdef CONFIG_CPU_S3C2400
1148
1149 static int s3c2400_serial_getsource(struct uart_port *port,
1150 struct s3c24xx_uart_clksrc *clk)
1151 {
1152 clk->divisor = 1;
1153 clk->name = "pclk";
1154
1155 return 0;
1156 }
1157
1158 static int s3c2400_serial_setsource(struct uart_port *port,
1159 struct s3c24xx_uart_clksrc *clk)
1160 {
1161 return 0;
1162 }
1163
1164 static int s3c2400_serial_resetport(struct uart_port *port,
1165 struct s3c2410_uartcfg *cfg)
1166 {
1167 dbg("s3c2400_serial_resetport: port=%p (%08lx), cfg=%p\n",
1168 port, port->mapbase, cfg);
1169
1170 wr_regl(port, S3C2410_UCON, cfg->ucon);
1171 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
1172
1173 /* reset both fifos */
1174
1175 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1176 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1177
1178 return 0;
1179 }
1180
1181 static struct s3c24xx_uart_info s3c2400_uart_inf = {
1182 .name = "Samsung S3C2400 UART",
1183 .type = PORT_S3C2400,
1184 .fifosize = 16,
1185 .rx_fifomask = S3C2410_UFSTAT_RXMASK,
1186 .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
1187 .rx_fifofull = S3C2410_UFSTAT_RXFULL,
1188 .tx_fifofull = S3C2410_UFSTAT_TXFULL,
1189 .tx_fifomask = S3C2410_UFSTAT_TXMASK,
1190 .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
1191 .get_clksrc = s3c2400_serial_getsource,
1192 .set_clksrc = s3c2400_serial_setsource,
1193 .reset_port = s3c2400_serial_resetport,
1194 };
1195
1196 static int s3c2400_serial_probe(struct platform_device *dev)
1197 {
1198 return s3c24xx_serial_probe(dev, &s3c2400_uart_inf);
1199 }
1200
1201 static struct platform_driver s3c2400_serial_drv = {
1202 .probe = s3c2400_serial_probe,
1203 .remove = s3c24xx_serial_remove,
1204 .suspend = s3c24xx_serial_suspend,
1205 .resume = s3c24xx_serial_resume,
1206 .driver = {
1207 .name = "s3c2400-uart",
1208 .owner = THIS_MODULE,
1209 },
1210 };
1211
1212 static inline int s3c2400_serial_init(void)
1213 {
1214 return s3c24xx_serial_init(&s3c2400_serial_drv, &s3c2400_uart_inf);
1215 }
1216
1217 static inline void s3c2400_serial_exit(void)
1218 {
1219 platform_driver_unregister(&s3c2400_serial_drv);
1220 }
1221
1222 #define s3c2400_uart_inf_at &s3c2400_uart_inf
1223 #else
1224
1225 static inline int s3c2400_serial_init(void)
1226 {
1227 return 0;
1228 }
1229
1230 static inline void s3c2400_serial_exit(void)
1231 {
1232 }
1233
1234 #define s3c2400_uart_inf_at NULL
1235
1236 #endif /* CONFIG_CPU_S3C2400 */
1237
1238 /* S3C2410 support */
1239
1240 #ifdef CONFIG_CPU_S3C2410
1241
1242 static int s3c2410_serial_setsource(struct uart_port *port,
1243 struct s3c24xx_uart_clksrc *clk)
1244 {
1245 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1246
1247 if (strcmp(clk->name, "uclk") == 0)
1248 ucon |= S3C2410_UCON_UCLK;
1249 else
1250 ucon &= ~S3C2410_UCON_UCLK;
1251
1252 wr_regl(port, S3C2410_UCON, ucon);
1253 return 0;
1254 }
1255
1256 static int s3c2410_serial_getsource(struct uart_port *port,
1257 struct s3c24xx_uart_clksrc *clk)
1258 {
1259 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1260
1261 clk->divisor = 1;
1262 clk->name = (ucon & S3C2410_UCON_UCLK) ? "uclk" : "pclk";
1263
1264 return 0;
1265 }
1266
1267 static int s3c2410_serial_resetport(struct uart_port *port,
1268 struct s3c2410_uartcfg *cfg)
1269 {
1270 dbg("s3c2410_serial_resetport: port=%p (%08lx), cfg=%p\n",
1271 port, port->mapbase, cfg);
1272
1273 wr_regl(port, S3C2410_UCON, cfg->ucon);
1274 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
1275
1276 /* reset both fifos */
1277
1278 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1279 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1280
1281 return 0;
1282 }
1283
1284 static struct s3c24xx_uart_info s3c2410_uart_inf = {
1285 .name = "Samsung S3C2410 UART",
1286 .type = PORT_S3C2410,
1287 .fifosize = 16,
1288 .rx_fifomask = S3C2410_UFSTAT_RXMASK,
1289 .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
1290 .rx_fifofull = S3C2410_UFSTAT_RXFULL,
1291 .tx_fifofull = S3C2410_UFSTAT_TXFULL,
1292 .tx_fifomask = S3C2410_UFSTAT_TXMASK,
1293 .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
1294 .get_clksrc = s3c2410_serial_getsource,
1295 .set_clksrc = s3c2410_serial_setsource,
1296 .reset_port = s3c2410_serial_resetport,
1297 };
1298
1299 /* device management */
1300
1301 static int s3c2410_serial_probe(struct platform_device *dev)
1302 {
1303 return s3c24xx_serial_probe(dev, &s3c2410_uart_inf);
1304 }
1305
1306 static struct platform_driver s3c2410_serial_drv = {
1307 .probe = s3c2410_serial_probe,
1308 .remove = s3c24xx_serial_remove,
1309 .suspend = s3c24xx_serial_suspend,
1310 .resume = s3c24xx_serial_resume,
1311 .driver = {
1312 .name = "s3c2410-uart",
1313 .owner = THIS_MODULE,
1314 },
1315 };
1316
1317 static inline int s3c2410_serial_init(void)
1318 {
1319 return s3c24xx_serial_init(&s3c2410_serial_drv, &s3c2410_uart_inf);
1320 }
1321
1322 static inline void s3c2410_serial_exit(void)
1323 {
1324 platform_driver_unregister(&s3c2410_serial_drv);
1325 }
1326
1327 #define s3c2410_uart_inf_at &s3c2410_uart_inf
1328 #else
1329
1330 static inline int s3c2410_serial_init(void)
1331 {
1332 return 0;
1333 }
1334
1335 static inline void s3c2410_serial_exit(void)
1336 {
1337 }
1338
1339 #define s3c2410_uart_inf_at NULL
1340
1341 #endif /* CONFIG_CPU_S3C2410 */
1342
1343 #if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2442)
1344
1345 static int s3c2440_serial_setsource(struct uart_port *port,
1346 struct s3c24xx_uart_clksrc *clk)
1347 {
1348 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1349
1350 // todo - proper fclk<>nonfclk switch //
1351
1352 ucon &= ~S3C2440_UCON_CLKMASK;
1353
1354 if (strcmp(clk->name, "uclk") == 0)
1355 ucon |= S3C2440_UCON_UCLK;
1356 else if (strcmp(clk->name, "pclk") == 0)
1357 ucon |= S3C2440_UCON_PCLK;
1358 else if (strcmp(clk->name, "fclk") == 0)
1359 ucon |= S3C2440_UCON_FCLK;
1360 else {
1361 printk(KERN_ERR "unknown clock source %s\n", clk->name);
1362 return -EINVAL;
1363 }
1364
1365 wr_regl(port, S3C2410_UCON, ucon);
1366 return 0;
1367 }
1368
1369
1370 static int s3c2440_serial_getsource(struct uart_port *port,
1371 struct s3c24xx_uart_clksrc *clk)
1372 {
1373 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1374 unsigned long ucon0, ucon1, ucon2;
1375
1376 switch (ucon & S3C2440_UCON_CLKMASK) {
1377 case S3C2440_UCON_UCLK:
1378 clk->divisor = 1;
1379 clk->name = "uclk";
1380 break;
1381
1382 case S3C2440_UCON_PCLK:
1383 case S3C2440_UCON_PCLK2:
1384 clk->divisor = 1;
1385 clk->name = "pclk";
1386 break;
1387
1388 case S3C2440_UCON_FCLK:
1389 /* the fun of calculating the uart divisors on
1390 * the s3c2440 */
1391
1392 ucon0 = __raw_readl(S3C24XX_VA_UART0 + S3C2410_UCON);
1393 ucon1 = __raw_readl(S3C24XX_VA_UART1 + S3C2410_UCON);
1394 ucon2 = __raw_readl(S3C24XX_VA_UART2 + S3C2410_UCON);
1395
1396 printk("ucons: %08lx, %08lx, %08lx\n", ucon0, ucon1, ucon2);
1397
1398 ucon0 &= S3C2440_UCON0_DIVMASK;
1399 ucon1 &= S3C2440_UCON1_DIVMASK;
1400 ucon2 &= S3C2440_UCON2_DIVMASK;
1401
1402 if (ucon0 != 0) {
1403 clk->divisor = ucon0 >> S3C2440_UCON_DIVSHIFT;
1404 clk->divisor += 6;
1405 } else if (ucon1 != 0) {
1406 clk->divisor = ucon1 >> S3C2440_UCON_DIVSHIFT;
1407 clk->divisor += 21;
1408 } else if (ucon2 != 0) {
1409 clk->divisor = ucon2 >> S3C2440_UCON_DIVSHIFT;
1410 clk->divisor += 36;
1411 } else {
1412 /* manual calims 44, seems to be 9 */
1413 clk->divisor = 9;
1414 }
1415
1416 clk->name = "fclk";
1417 break;
1418 }
1419
1420 return 0;
1421 }
1422
1423 static int s3c2440_serial_resetport(struct uart_port *port,
1424 struct s3c2410_uartcfg *cfg)
1425 {
1426 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1427
1428 dbg("s3c2440_serial_resetport: port=%p (%08lx), cfg=%p\n",
1429 port, port->mapbase, cfg);
1430
1431 /* ensure we don't change the clock settings... */
1432
1433 ucon &= (S3C2440_UCON0_DIVMASK | (3<<10));
1434
1435 wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
1436 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
1437
1438 /* reset both fifos */
1439
1440 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1441 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1442
1443 return 0;
1444 }
1445
1446 static struct s3c24xx_uart_info s3c2440_uart_inf = {
1447 .name = "Samsung S3C2440 UART",
1448 .type = PORT_S3C2440,
1449 .fifosize = 64,
1450 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1451 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1452 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1453 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1454 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1455 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1456 .get_clksrc = s3c2440_serial_getsource,
1457 .set_clksrc = s3c2440_serial_setsource,
1458 .reset_port = s3c2440_serial_resetport,
1459 };
1460
1461 /* device management */
1462
1463 static int s3c2440_serial_probe(struct platform_device *dev)
1464 {
1465 dbg("s3c2440_serial_probe: dev=%p\n", dev);
1466 return s3c24xx_serial_probe(dev, &s3c2440_uart_inf);
1467 }
1468
1469 static struct platform_driver s3c2440_serial_drv = {
1470 .probe = s3c2440_serial_probe,
1471 .remove = s3c24xx_serial_remove,
1472 .suspend = s3c24xx_serial_suspend,
1473 .resume = s3c24xx_serial_resume,
1474 .driver = {
1475 .name = "s3c2440-uart",
1476 .owner = THIS_MODULE,
1477 },
1478 };
1479
1480
1481 static inline int s3c2440_serial_init(void)
1482 {
1483 return s3c24xx_serial_init(&s3c2440_serial_drv, &s3c2440_uart_inf);
1484 }
1485
1486 static inline void s3c2440_serial_exit(void)
1487 {
1488 platform_driver_unregister(&s3c2440_serial_drv);
1489 }
1490
1491 #define s3c2440_uart_inf_at &s3c2440_uart_inf
1492 #else
1493
1494 static inline int s3c2440_serial_init(void)
1495 {
1496 return 0;
1497 }
1498
1499 static inline void s3c2440_serial_exit(void)
1500 {
1501 }
1502
1503 #define s3c2440_uart_inf_at NULL
1504 #endif /* CONFIG_CPU_S3C2440 */
1505
1506 #if defined(CONFIG_CPU_S3C2412)
1507
1508 static int s3c2412_serial_setsource(struct uart_port *port,
1509 struct s3c24xx_uart_clksrc *clk)
1510 {
1511 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1512
1513 ucon &= ~S3C2412_UCON_CLKMASK;
1514
1515 if (strcmp(clk->name, "uclk") == 0)
1516 ucon |= S3C2440_UCON_UCLK;
1517 else if (strcmp(clk->name, "pclk") == 0)
1518 ucon |= S3C2440_UCON_PCLK;
1519 else if (strcmp(clk->name, "usysclk") == 0)
1520 ucon |= S3C2412_UCON_USYSCLK;
1521 else {
1522 printk(KERN_ERR "unknown clock source %s\n", clk->name);
1523 return -EINVAL;
1524 }
1525
1526 wr_regl(port, S3C2410_UCON, ucon);
1527 return 0;
1528 }
1529
1530
1531 static int s3c2412_serial_getsource(struct uart_port *port,
1532 struct s3c24xx_uart_clksrc *clk)
1533 {
1534 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1535
1536 switch (ucon & S3C2412_UCON_CLKMASK) {
1537 case S3C2412_UCON_UCLK:
1538 clk->divisor = 1;
1539 clk->name = "uclk";
1540 break;
1541
1542 case S3C2412_UCON_PCLK:
1543 case S3C2412_UCON_PCLK2:
1544 clk->divisor = 1;
1545 clk->name = "pclk";
1546 break;
1547
1548 case S3C2412_UCON_USYSCLK:
1549 clk->divisor = 1;
1550 clk->name = "usysclk";
1551 break;
1552 }
1553
1554 return 0;
1555 }
1556
1557 static int s3c2412_serial_resetport(struct uart_port *port,
1558 struct s3c2410_uartcfg *cfg)
1559 {
1560 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1561
1562 dbg("%s: port=%p (%08lx), cfg=%p\n",
1563 __func__, port, port->mapbase, cfg);
1564
1565 /* ensure we don't change the clock settings... */
1566
1567 ucon &= S3C2412_UCON_CLKMASK;
1568
1569 wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
1570 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
1571
1572 /* reset both fifos */
1573
1574 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1575 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1576
1577 return 0;
1578 }
1579
1580 static struct s3c24xx_uart_info s3c2412_uart_inf = {
1581 .name = "Samsung S3C2412 UART",
1582 .type = PORT_S3C2412,
1583 .fifosize = 64,
1584 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1585 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1586 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1587 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1588 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1589 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1590 .get_clksrc = s3c2412_serial_getsource,
1591 .set_clksrc = s3c2412_serial_setsource,
1592 .reset_port = s3c2412_serial_resetport,
1593 };
1594
1595 /* device management */
1596
1597 static int s3c2412_serial_probe(struct platform_device *dev)
1598 {
1599 dbg("s3c2440_serial_probe: dev=%p\n", dev);
1600 return s3c24xx_serial_probe(dev, &s3c2412_uart_inf);
1601 }
1602
1603 static struct platform_driver s3c2412_serial_drv = {
1604 .probe = s3c2412_serial_probe,
1605 .remove = s3c24xx_serial_remove,
1606 .suspend = s3c24xx_serial_suspend,
1607 .resume = s3c24xx_serial_resume,
1608 .driver = {
1609 .name = "s3c2412-uart",
1610 .owner = THIS_MODULE,
1611 },
1612 };
1613
1614
1615 static inline int s3c2412_serial_init(void)
1616 {
1617 return s3c24xx_serial_init(&s3c2412_serial_drv, &s3c2412_uart_inf);
1618 }
1619
1620 static inline void s3c2412_serial_exit(void)
1621 {
1622 platform_driver_unregister(&s3c2412_serial_drv);
1623 }
1624
1625 #define s3c2412_uart_inf_at &s3c2412_uart_inf
1626 #else
1627
1628 static inline int s3c2412_serial_init(void)
1629 {
1630 return 0;
1631 }
1632
1633 static inline void s3c2412_serial_exit(void)
1634 {
1635 }
1636
1637 #define s3c2412_uart_inf_at NULL
1638 #endif /* CONFIG_CPU_S3C2440 */
1639
1640
1641 /* module initialisation code */
1642
1643 static int __init s3c24xx_serial_modinit(void)
1644 {
1645 int ret;
1646
1647 ret = uart_register_driver(&s3c24xx_uart_drv);
1648 if (ret < 0) {
1649 printk(KERN_ERR "failed to register UART driver\n");
1650 return -1;
1651 }
1652
1653 s3c2400_serial_init();
1654 s3c2410_serial_init();
1655 s3c2412_serial_init();
1656 s3c2440_serial_init();
1657
1658 return 0;
1659 }
1660
1661 static void __exit s3c24xx_serial_modexit(void)
1662 {
1663 s3c2400_serial_exit();
1664 s3c2410_serial_exit();
1665 s3c2412_serial_exit();
1666 s3c2440_serial_exit();
1667
1668 uart_unregister_driver(&s3c24xx_uart_drv);
1669 }
1670
1671
1672 module_init(s3c24xx_serial_modinit);
1673 module_exit(s3c24xx_serial_modexit);
1674
1675 /* Console code */
1676
1677 #ifdef CONFIG_SERIAL_S3C2410_CONSOLE
1678
1679 static struct uart_port *cons_uart;
1680
1681 static int
1682 s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
1683 {
1684 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1685 unsigned long ufstat, utrstat;
1686
1687 if (ufcon & S3C2410_UFCON_FIFOMODE) {
1688 /* fifo mode - check ammount of data in fifo registers... */
1689
1690 ufstat = rd_regl(port, S3C2410_UFSTAT);
1691 return (ufstat & info->tx_fifofull) ? 0 : 1;
1692 }
1693
1694 /* in non-fifo mode, we go and use the tx buffer empty */
1695
1696 utrstat = rd_regl(port, S3C2410_UTRSTAT);
1697 return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
1698 }
1699
1700 static void
1701 s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
1702 {
1703 unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON);
1704 while (!s3c24xx_serial_console_txrdy(port, ufcon))
1705 barrier();
1706 wr_regb(cons_uart, S3C2410_UTXH, ch);
1707 }
1708
1709 static void
1710 s3c24xx_serial_console_write(struct console *co, const char *s,
1711 unsigned int count)
1712 {
1713 uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
1714 }
1715
1716 static void __init
1717 s3c24xx_serial_get_options(struct uart_port *port, int *baud,
1718 int *parity, int *bits)
1719 {
1720 struct s3c24xx_uart_clksrc clksrc;
1721 struct clk *clk;
1722 unsigned int ulcon;
1723 unsigned int ucon;
1724 unsigned int ubrdiv;
1725 unsigned long rate;
1726
1727 ulcon = rd_regl(port, S3C2410_ULCON);
1728 ucon = rd_regl(port, S3C2410_UCON);
1729 ubrdiv = rd_regl(port, S3C2410_UBRDIV);
1730
1731 dbg("s3c24xx_serial_get_options: port=%p\n"
1732 "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
1733 port, ulcon, ucon, ubrdiv);
1734
1735 if ((ucon & 0xf) != 0) {
1736 /* consider the serial port configured if the tx/rx mode set */
1737
1738 switch (ulcon & S3C2410_LCON_CSMASK) {
1739 case S3C2410_LCON_CS5:
1740 *bits = 5;
1741 break;
1742 case S3C2410_LCON_CS6:
1743 *bits = 6;
1744 break;
1745 case S3C2410_LCON_CS7:
1746 *bits = 7;
1747 break;
1748 default:
1749 case S3C2410_LCON_CS8:
1750 *bits = 8;
1751 break;
1752 }
1753
1754 switch (ulcon & S3C2410_LCON_PMASK) {
1755 case S3C2410_LCON_PEVEN:
1756 *parity = 'e';
1757 break;
1758
1759 case S3C2410_LCON_PODD:
1760 *parity = 'o';
1761 break;
1762
1763 case S3C2410_LCON_PNONE:
1764 default:
1765 *parity = 'n';
1766 }
1767
1768 /* now calculate the baud rate */
1769
1770 s3c24xx_serial_getsource(port, &clksrc);
1771
1772 clk = clk_get(port->dev, clksrc.name);
1773 if (!IS_ERR(clk) && clk != NULL)
1774 rate = clk_get_rate(clk) / clksrc.divisor;
1775 else
1776 rate = 1;
1777
1778
1779 *baud = rate / ( 16 * (ubrdiv + 1));
1780 dbg("calculated baud %d\n", *baud);
1781 }
1782
1783 }
1784
1785 /* s3c24xx_serial_init_ports
1786 *
1787 * initialise the serial ports from the machine provided initialisation
1788 * data.
1789 */
1790
1791 static int s3c24xx_serial_init_ports(struct s3c24xx_uart_info *info)
1792 {
1793 struct s3c24xx_uart_port *ptr = s3c24xx_serial_ports;
1794 struct platform_device **platdev_ptr;
1795 int i;
1796
1797 dbg("s3c24xx_serial_init_ports: initialising ports...\n");
1798
1799 platdev_ptr = s3c24xx_uart_devs;
1800
1801 for (i = 0; i < NR_PORTS; i++, ptr++, platdev_ptr++) {
1802 s3c24xx_serial_init_port(ptr, info, *platdev_ptr);
1803 }
1804
1805 return 0;
1806 }
1807
1808 static int __init
1809 s3c24xx_serial_console_setup(struct console *co, char *options)
1810 {
1811 struct uart_port *port;
1812 int baud = 9600;
1813 int bits = 8;
1814 int parity = 'n';
1815 int flow = 'n';
1816
1817 dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n",
1818 co, co->index, options);
1819
1820 /* is this a valid port */
1821
1822 if (co->index == -1 || co->index >= NR_PORTS)
1823 co->index = 0;
1824
1825 port = &s3c24xx_serial_ports[co->index].port;
1826
1827 /* is the port configured? */
1828
1829 if (port->mapbase == 0x0) {
1830 co->index = 0;
1831 port = &s3c24xx_serial_ports[co->index].port;
1832 }
1833
1834 cons_uart = port;
1835
1836 dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index);
1837
1838 /*
1839 * Check whether an invalid uart number has been specified, and
1840 * if so, search for the first available port that does have
1841 * console support.
1842 */
1843 if (options)
1844 uart_parse_options(options, &baud, &parity, &bits, &flow);
1845 else
1846 s3c24xx_serial_get_options(port, &baud, &parity, &bits);
1847
1848 dbg("s3c24xx_serial_console_setup: baud %d\n", baud);
1849
1850 return uart_set_options(port, co, baud, parity, bits, flow);
1851 }
1852
1853 /* s3c24xx_serial_initconsole
1854 *
1855 * initialise the console from one of the uart drivers
1856 */
1857
1858 static struct console s3c24xx_serial_console =
1859 {
1860 .name = S3C24XX_SERIAL_NAME,
1861 .device = uart_console_device,
1862 .flags = CON_PRINTBUFFER,
1863 .index = -1,
1864 .write = s3c24xx_serial_console_write,
1865 .setup = s3c24xx_serial_console_setup
1866 };
1867
1868 static int s3c24xx_serial_initconsole(void)
1869 {
1870 struct s3c24xx_uart_info *info;
1871 struct platform_device *dev = s3c24xx_uart_devs[0];
1872
1873 dbg("s3c24xx_serial_initconsole\n");
1874
1875 /* select driver based on the cpu */
1876
1877 if (dev == NULL) {
1878 printk(KERN_ERR "s3c24xx: no devices for console init\n");
1879 return 0;
1880 }
1881
1882 if (strcmp(dev->name, "s3c2400-uart") == 0) {
1883 info = s3c2400_uart_inf_at;
1884 } else if (strcmp(dev->name, "s3c2410-uart") == 0) {
1885 info = s3c2410_uart_inf_at;
1886 } else if (strcmp(dev->name, "s3c2440-uart") == 0) {
1887 info = s3c2440_uart_inf_at;
1888 } else if (strcmp(dev->name, "s3c2412-uart") == 0) {
1889 info = s3c2412_uart_inf_at;
1890 } else {
1891 printk(KERN_ERR "s3c24xx: no driver for %s\n", dev->name);
1892 return 0;
1893 }
1894
1895 if (info == NULL) {
1896 printk(KERN_ERR "s3c24xx: no driver for console\n");
1897 return 0;
1898 }
1899
1900 s3c24xx_serial_console.data = &s3c24xx_uart_drv;
1901 s3c24xx_serial_init_ports(info);
1902
1903 register_console(&s3c24xx_serial_console);
1904 return 0;
1905 }
1906
1907 console_initcall(s3c24xx_serial_initconsole);
1908
1909 #endif /* CONFIG_SERIAL_S3C2410_CONSOLE */
1910
1911 MODULE_LICENSE("GPL");
1912 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
1913 MODULE_DESCRIPTION("Samsung S3C2410/S3C2440/S3C2412 Serial port driver");
1914 MODULE_ALIAS("platform:s3c2400-uart");
1915 MODULE_ALIAS("platform:s3c2410-uart");
1916 MODULE_ALIAS("platform:s3c2412-uart");
1917 MODULE_ALIAS("platform:s3c2440-uart");
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