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[CPUFREQ] Fix the p4-clockmod N60 errata workaround.
[linux-2.6/mini2440.git] / drivers / serial / s3c2410.c
blob7410e093a6b9ffa733a4629c947c4d7324ecdcc7
1 /*
2 * linux/drivers/serial/s3c2410.c
3 *
4 * Driver for onboard UARTs on the Samsung S3C24XX
5 *
6 * Based on drivers/char/serial.c and drivers/char/21285.c
7 *
8 * Ben Dooks, (c) 2003-2005 Simtec Electronics
9 * http://www.simtec.co.uk/products/SWLINUX/
10 *
11 * Changelog:
12 *
13 * 22-Jul-2004 BJD Finished off device rewrite
14 *
15 * 21-Jul-2004 BJD Thanks to <herbet@13thfloor.at> for pointing out
16 * problems with baud rate and loss of IR settings. Update
17 * to add configuration via platform_device structure
18 *
19 * 28-Sep-2004 BJD Re-write for the following items
20 * - S3C2410 and S3C2440 serial support
21 * - Power Management support
22 * - Fix console via IrDA devices
23 * - SysReq (Herbert Pötzl)
24 * - Break character handling (Herbert Pötzl)
25 * - spin-lock initialisation (Dimitry Andric)
26 * - added clock control
27 * - updated init code to use platform_device info
28 *
29 * 06-Mar-2005 BJD Add s3c2440 fclk clock source
30 *
31 * 09-Mar-2005 BJD Add s3c2400 support
32 *
33 * 10-Mar-2005 LCVR Changed S3C2410_VA_UART to S3C24XX_VA_UART
34 */
35
36 /* Note on 2440 fclk clock source handling
37 *
38 * Whilst it is possible to use the fclk as clock source, the method
39 * of properly switching too/from this is currently un-implemented, so
40 * whichever way is configured at startup is the one that will be used.
41 */
42
43 /* Hote on 2410 error handling
44 *
45 * The s3c2410 manual has a love/hate affair with the contents of the
46 * UERSTAT register in the UART blocks, and keeps marking some of the
47 * error bits as reserved. Having checked with the s3c2410x01,
48 * it copes with BREAKs properly, so I am happy to ignore the RESERVED
49 * feature from the latter versions of the manual.
50 *
51 * If it becomes aparrent that latter versions of the 2410 remove these
52 * bits, then action will have to be taken to differentiate the versions
53 * and change the policy on BREAK
54 *
55 * BJD, 04-Nov-2004
56 */
57
58 #include <linux/config.h>
59
60 #if defined(CONFIG_SERIAL_S3C2410_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
61 #define SUPPORT_SYSRQ
62 #endif
63
64 #include <linux/module.h>
65 #include <linux/ioport.h>
66 #include <linux/platform_device.h>
67 #include <linux/init.h>
68 #include <linux/sysrq.h>
69 #include <linux/console.h>
70 #include <linux/tty.h>
71 #include <linux/tty_flip.h>
72 #include <linux/serial_core.h>
73 #include <linux/serial.h>
74 #include <linux/delay.h>
75 #include <linux/clk.h>
76
77 #include <asm/io.h>
78 #include <asm/irq.h>
79
80 #include <asm/hardware.h>
81
82 #include <asm/arch/regs-serial.h>
83 #include <asm/arch/regs-gpio.h>
84
85 /* structures */
86
87 struct s3c24xx_uart_info {
88 char *name;
89 unsigned int type;
90 unsigned int fifosize;
91 unsigned long rx_fifomask;
92 unsigned long rx_fifoshift;
93 unsigned long rx_fifofull;
94 unsigned long tx_fifomask;
95 unsigned long tx_fifoshift;
96 unsigned long tx_fifofull;
97
98 /* clock source control */
99
100 int (*get_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk);
101 int (*set_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk);
102
103 /* uart controls */
104 int (*reset_port)(struct uart_port *, struct s3c2410_uartcfg *);
105 };
106
107 struct s3c24xx_uart_port {
108 unsigned char rx_claimed;
109 unsigned char tx_claimed;
110
111 struct s3c24xx_uart_info *info;
112 struct s3c24xx_uart_clksrc *clksrc;
113 struct clk *clk;
114 struct clk *baudclk;
115 struct uart_port port;
116 };
117
118
119 /* configuration defines */
120
121 #if 0
122 #if 1
123 /* send debug to the low-level output routines */
124
125 extern void printascii(const char *);
126
127 static void
128 s3c24xx_serial_dbg(const char *fmt, ...)
129 {
130 va_list va;
131 char buff[256];
132
133 va_start(va, fmt);
134 vsprintf(buff, fmt, va);
135 va_end(va);
136
137 printascii(buff);
138 }
139
140 #define dbg(x...) s3c24xx_serial_dbg(x)
141
142 #else
143 #define dbg(x...) printk(KERN_DEBUG "s3c24xx: ");
144 #endif
145 #else /* no debug */
146 #define dbg(x...) do {} while(0)
147 #endif
148
149 /* UART name and device definitions */
150
151 #define S3C24XX_SERIAL_NAME "ttySAC"
152 #define S3C24XX_SERIAL_DEVFS "tts/"
153 #define S3C24XX_SERIAL_MAJOR 204
154 #define S3C24XX_SERIAL_MINOR 64
155
156
157 /* conversion functions */
158
159 #define s3c24xx_dev_to_port(__dev) (struct uart_port *)dev_get_drvdata(__dev)
160 #define s3c24xx_dev_to_cfg(__dev) (struct s3c2410_uartcfg *)((__dev)->platform_data)
161
162 /* we can support 3 uarts, but not always use them */
163
164 #ifdef CONFIG_CPU_S3C2400
165 #define NR_PORTS (2)
166 #else
167 #define NR_PORTS (3)
168 #endif
169
170 /* port irq numbers */
171
172 #define TX_IRQ(port) ((port)->irq + 1)
173 #define RX_IRQ(port) ((port)->irq)
174
175 /* register access controls */
176
177 #define portaddr(port, reg) ((port)->membase + (reg))
178
179 #define rd_regb(port, reg) (__raw_readb(portaddr(port, reg)))
180 #define rd_regl(port, reg) (__raw_readl(portaddr(port, reg)))
181
182 #define wr_regb(port, reg, val) \
183 do { __raw_writeb(val, portaddr(port, reg)); } while(0)
184
185 #define wr_regl(port, reg, val) \
186 do { __raw_writel(val, portaddr(port, reg)); } while(0)
187
188 /* macros to change one thing to another */
189
190 #define tx_enabled(port) ((port)->unused[0])
191 #define rx_enabled(port) ((port)->unused[1])
192
193 /* flag to ignore all characters comming in */
194 #define RXSTAT_DUMMY_READ (0x10000000)
195
196 static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port)
197 {
198 return container_of(port, struct s3c24xx_uart_port, port);
199 }
200
201 /* translate a port to the device name */
202
203 static inline const char *s3c24xx_serial_portname(struct uart_port *port)
204 {
205 return to_platform_device(port->dev)->name;
206 }
207
208 static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
209 {
210 return (rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE);
211 }
212
213 static void s3c24xx_serial_rx_enable(struct uart_port *port)
214 {
215 unsigned long flags;
216 unsigned int ucon, ufcon;
217 int count = 10000;
218
219 spin_lock_irqsave(&port->lock, flags);
220
221 while (--count && !s3c24xx_serial_txempty_nofifo(port))
222 udelay(100);
223
224 ufcon = rd_regl(port, S3C2410_UFCON);
225 ufcon |= S3C2410_UFCON_RESETRX;
226 wr_regl(port, S3C2410_UFCON, ufcon);
227
228 ucon = rd_regl(port, S3C2410_UCON);
229 ucon |= S3C2410_UCON_RXIRQMODE;
230 wr_regl(port, S3C2410_UCON, ucon);
231
232 rx_enabled(port) = 1;
233 spin_unlock_irqrestore(&port->lock, flags);
234 }
235
236 static void s3c24xx_serial_rx_disable(struct uart_port *port)
237 {
238 unsigned long flags;
239 unsigned int ucon;
240
241 spin_lock_irqsave(&port->lock, flags);
242
243 ucon = rd_regl(port, S3C2410_UCON);
244 ucon &= ~S3C2410_UCON_RXIRQMODE;
245 wr_regl(port, S3C2410_UCON, ucon);
246
247 rx_enabled(port) = 0;
248 spin_unlock_irqrestore(&port->lock, flags);
249 }
250
251 static void s3c24xx_serial_stop_tx(struct uart_port *port)
252 {
253 if (tx_enabled(port)) {
254 disable_irq(TX_IRQ(port));
255 tx_enabled(port) = 0;
256 if (port->flags & UPF_CONS_FLOW)
257 s3c24xx_serial_rx_enable(port);
258 }
259 }
260
261 static void s3c24xx_serial_start_tx(struct uart_port *port)
262 {
263 if (!tx_enabled(port)) {
264 if (port->flags & UPF_CONS_FLOW)
265 s3c24xx_serial_rx_disable(port);
266
267 enable_irq(TX_IRQ(port));
268 tx_enabled(port) = 1;
269 }
270 }
271
272
273 static void s3c24xx_serial_stop_rx(struct uart_port *port)
274 {
275 if (rx_enabled(port)) {
276 dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
277 disable_irq(RX_IRQ(port));
278 rx_enabled(port) = 0;
279 }
280 }
281
282 static void s3c24xx_serial_enable_ms(struct uart_port *port)
283 {
284 }
285
286 static inline struct s3c24xx_uart_info *s3c24xx_port_to_info(struct uart_port *port)
287 {
288 return to_ourport(port)->info;
289 }
290
291 static inline struct s3c2410_uartcfg *s3c24xx_port_to_cfg(struct uart_port *port)
292 {
293 if (port->dev == NULL)
294 return NULL;
295
296 return (struct s3c2410_uartcfg *)port->dev->platform_data;
297 }
298
299 static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
300 unsigned long ufstat)
301 {
302 struct s3c24xx_uart_info *info = ourport->info;
303
304 if (ufstat & info->rx_fifofull)
305 return info->fifosize;
306
307 return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
308 }
309
310
311 /* ? - where has parity gone?? */
312 #define S3C2410_UERSTAT_PARITY (0x1000)
313
314 static irqreturn_t
315 s3c24xx_serial_rx_chars(int irq, void *dev_id, struct pt_regs *regs)
316 {
317 struct s3c24xx_uart_port *ourport = dev_id;
318 struct uart_port *port = &ourport->port;
319 struct tty_struct *tty = port->info->tty;
320 unsigned int ufcon, ch, flag, ufstat, uerstat;
321 int max_count = 64;
322
323 while (max_count-- > 0) {
324 ufcon = rd_regl(port, S3C2410_UFCON);
325 ufstat = rd_regl(port, S3C2410_UFSTAT);
326
327 if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
328 break;
329
330 uerstat = rd_regl(port, S3C2410_UERSTAT);
331 ch = rd_regb(port, S3C2410_URXH);
332
333 if (port->flags & UPF_CONS_FLOW) {
334 int txe = s3c24xx_serial_txempty_nofifo(port);
335
336 if (rx_enabled(port)) {
337 if (!txe) {
338 rx_enabled(port) = 0;
339 continue;
340 }
341 } else {
342 if (txe) {
343 ufcon |= S3C2410_UFCON_RESETRX;
344 wr_regl(port, S3C2410_UFCON, ufcon);
345 rx_enabled(port) = 1;
346 goto out;
347 }
348 continue;
349 }
350 }
351
352 /* insert the character into the buffer */
353
354 flag = TTY_NORMAL;
355 port->icount.rx++;
356
357 if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) {
358 dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n",
359 ch, uerstat);
360
361 /* check for break */
362 if (uerstat & S3C2410_UERSTAT_BREAK) {
363 dbg("break!\n");
364 port->icount.brk++;
365 if (uart_handle_break(port))
366 goto ignore_char;
367 }
368
369 if (uerstat & S3C2410_UERSTAT_FRAME)
370 port->icount.frame++;
371 if (uerstat & S3C2410_UERSTAT_OVERRUN)
372 port->icount.overrun++;
373
374 uerstat &= port->read_status_mask;
375
376 if (uerstat & S3C2410_UERSTAT_BREAK)
377 flag = TTY_BREAK;
378 else if (uerstat & S3C2410_UERSTAT_PARITY)
379 flag = TTY_PARITY;
380 else if (uerstat & ( S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_OVERRUN))
381 flag = TTY_FRAME;
382 }
383
384 if (uart_handle_sysrq_char(port, ch, regs))
385 goto ignore_char;
386
387 uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN, ch, flag);
388
389 ignore_char:
390 continue;
391 }
392 tty_flip_buffer_push(tty);
393
394 out:
395 return IRQ_HANDLED;
396 }
397
398 static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id, struct pt_regs *regs)
399 {
400 struct s3c24xx_uart_port *ourport = id;
401 struct uart_port *port = &ourport->port;
402 struct circ_buf *xmit = &port->info->xmit;
403 int count = 256;
404
405 if (port->x_char) {
406 wr_regb(port, S3C2410_UTXH, port->x_char);
407 port->icount.tx++;
408 port->x_char = 0;
409 goto out;
410 }
411
412 /* if there isnt anything more to transmit, or the uart is now
413 * stopped, disable the uart and exit
414 */
415
416 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
417 s3c24xx_serial_stop_tx(port);
418 goto out;
419 }
420
421 /* try and drain the buffer... */
422
423 while (!uart_circ_empty(xmit) && count-- > 0) {
424 if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
425 break;
426
427 wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
428 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
429 port->icount.tx++;
430 }
431
432 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
433 uart_write_wakeup(port);
434
435 if (uart_circ_empty(xmit))
436 s3c24xx_serial_stop_tx(port);
437
438 out:
439 return IRQ_HANDLED;
440 }
441
442 static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
443 {
444 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
445 unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT);
446 unsigned long ufcon = rd_regl(port, S3C2410_UFCON);
447
448 if (ufcon & S3C2410_UFCON_FIFOMODE) {
449 if ((ufstat & info->tx_fifomask) != 0 ||
450 (ufstat & info->tx_fifofull))
451 return 0;
452
453 return 1;
454 }
455
456 return s3c24xx_serial_txempty_nofifo(port);
457 }
458
459 /* no modem control lines */
460 static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
461 {
462 unsigned int umstat = rd_regb(port,S3C2410_UMSTAT);
463
464 if (umstat & S3C2410_UMSTAT_CTS)
465 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
466 else
467 return TIOCM_CAR | TIOCM_DSR;
468 }
469
470 static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
471 {
472 /* todo - possibly remove AFC and do manual CTS */
473 }
474
475 static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
476 {
477 unsigned long flags;
478 unsigned int ucon;
479
480 spin_lock_irqsave(&port->lock, flags);
481
482 ucon = rd_regl(port, S3C2410_UCON);
483
484 if (break_state)
485 ucon |= S3C2410_UCON_SBREAK;
486 else
487 ucon &= ~S3C2410_UCON_SBREAK;
488
489 wr_regl(port, S3C2410_UCON, ucon);
490
491 spin_unlock_irqrestore(&port->lock, flags);
492 }
493
494 static void s3c24xx_serial_shutdown(struct uart_port *port)
495 {
496 struct s3c24xx_uart_port *ourport = to_ourport(port);
497
498 if (ourport->tx_claimed) {
499 free_irq(TX_IRQ(port), ourport);
500 tx_enabled(port) = 0;
501 ourport->tx_claimed = 0;
502 }
503
504 if (ourport->rx_claimed) {
505 free_irq(RX_IRQ(port), ourport);
506 ourport->rx_claimed = 0;
507 rx_enabled(port) = 0;
508 }
509 }
510
511
512 static int s3c24xx_serial_startup(struct uart_port *port)
513 {
514 struct s3c24xx_uart_port *ourport = to_ourport(port);
515 int ret;
516
517 dbg("s3c24xx_serial_startup: port=%p (%08lx,%p)\n",
518 port->mapbase, port->membase);
519
520 rx_enabled(port) = 1;
521
522 ret = request_irq(RX_IRQ(port),
523 s3c24xx_serial_rx_chars, 0,
524 s3c24xx_serial_portname(port), ourport);
525
526 if (ret != 0) {
527 printk(KERN_ERR "cannot get irq %d\n", RX_IRQ(port));
528 return ret;
529 }
530
531 ourport->rx_claimed = 1;
532
533 dbg("requesting tx irq...\n");
534
535 tx_enabled(port) = 1;
536
537 ret = request_irq(TX_IRQ(port),
538 s3c24xx_serial_tx_chars, 0,
539 s3c24xx_serial_portname(port), ourport);
540
541 if (ret) {
542 printk(KERN_ERR "cannot get irq %d\n", TX_IRQ(port));
543 goto err;
544 }
545
546 ourport->tx_claimed = 1;
547
548 dbg("s3c24xx_serial_startup ok\n");
549
550 /* the port reset code should have done the correct
551 * register setup for the port controls */
552
553 return ret;
554
555 err:
556 s3c24xx_serial_shutdown(port);
557 return ret;
558 }
559
560 /* power power management control */
561
562 static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
563 unsigned int old)
564 {
565 struct s3c24xx_uart_port *ourport = to_ourport(port);
566
567 switch (level) {
568 case 3:
569 if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL)
570 clk_disable(ourport->baudclk);
571
572 clk_disable(ourport->clk);
573 break;
574
575 case 0:
576 clk_enable(ourport->clk);
577
578 if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL)
579 clk_enable(ourport->baudclk);
580
581 break;
582 default:
583 printk(KERN_ERR "s3c24xx_serial: unknown pm %d\n", level);
584 }
585 }
586
587 /* baud rate calculation
588 *
589 * The UARTs on the S3C2410/S3C2440 can take their clocks from a number
590 * of different sources, including the peripheral clock ("pclk") and an
591 * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk")
592 * with a programmable extra divisor.
593 *
594 * The following code goes through the clock sources, and calculates the
595 * baud clocks (and the resultant actual baud rates) and then tries to
596 * pick the closest one and select that.
597 *
598 */
599
600
601 #define MAX_CLKS (8)
602
603 static struct s3c24xx_uart_clksrc tmp_clksrc = {
604 .name = "pclk",
605 .min_baud = 0,
606 .max_baud = 0,
607 .divisor = 1,
608 };
609
610 static inline int
611 s3c24xx_serial_getsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c)
612 {
613 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
614
615 return (info->get_clksrc)(port, c);
616 }
617
618 static inline int
619 s3c24xx_serial_setsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c)
620 {
621 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
622
623 return (info->set_clksrc)(port, c);
624 }
625
626 struct baud_calc {
627 struct s3c24xx_uart_clksrc *clksrc;
628 unsigned int calc;
629 unsigned int quot;
630 struct clk *src;
631 };
632
633 static int s3c24xx_serial_calcbaud(struct baud_calc *calc,
634 struct uart_port *port,
635 struct s3c24xx_uart_clksrc *clksrc,
636 unsigned int baud)
637 {
638 unsigned long rate;
639
640 calc->src = clk_get(port->dev, clksrc->name);
641 if (calc->src == NULL || IS_ERR(calc->src))
642 return 0;
643
644 rate = clk_get_rate(calc->src);
645 rate /= clksrc->divisor;
646
647 calc->clksrc = clksrc;
648 calc->quot = (rate + (8 * baud)) / (16 * baud);
649 calc->calc = (rate / (calc->quot * 16));
650
651 calc->quot--;
652 return 1;
653 }
654
655 static unsigned int s3c24xx_serial_getclk(struct uart_port *port,
656 struct s3c24xx_uart_clksrc **clksrc,
657 struct clk **clk,
658 unsigned int baud)
659 {
660 struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
661 struct s3c24xx_uart_clksrc *clkp;
662 struct baud_calc res[MAX_CLKS];
663 struct baud_calc *resptr, *best, *sptr;
664 int i;
665
666 clkp = cfg->clocks;
667 best = NULL;
668
669 if (cfg->clocks_size < 2) {
670 if (cfg->clocks_size == 0)
671 clkp = &tmp_clksrc;
672
673 /* check to see if we're sourcing fclk, and if so we're
674 * going to have to update the clock source
675 */
676
677 if (strcmp(clkp->name, "fclk") == 0) {
678 struct s3c24xx_uart_clksrc src;
679
680 s3c24xx_serial_getsource(port, &src);
681
682 /* check that the port already using fclk, and if
683 * not, then re-select fclk
684 */
685
686 if (strcmp(src.name, clkp->name) == 0) {
687 s3c24xx_serial_setsource(port, clkp);
688 s3c24xx_serial_getsource(port, &src);
689 }
690
691 clkp->divisor = src.divisor;
692 }
693
694 s3c24xx_serial_calcbaud(res, port, clkp, baud);
695 best = res;
696 resptr = best + 1;
697 } else {
698 resptr = res;
699
700 for (i = 0; i < cfg->clocks_size; i++, clkp++) {
701 if (s3c24xx_serial_calcbaud(resptr, port, clkp, baud))
702 resptr++;
703 }
704 }
705
706 /* ok, we now need to select the best clock we found */
707
708 if (!best) {
709 unsigned int deviation = (1<<30)|((1<<30)-1);
710 int calc_deviation;
711
712 for (sptr = res; sptr < resptr; sptr++) {
713 printk(KERN_DEBUG
714 "found clk %p (%s) quot %d, calc %d\n",
715 sptr->clksrc, sptr->clksrc->name,
716 sptr->quot, sptr->calc);
717
718 calc_deviation = baud - sptr->calc;
719 if (calc_deviation < 0)
720 calc_deviation = -calc_deviation;
721
722 if (calc_deviation < deviation) {
723 best = sptr;
724 deviation = calc_deviation;
725 }
726 }
727
728 printk(KERN_DEBUG "best %p (deviation %d)\n", best, deviation);
729 }
730
731 printk(KERN_DEBUG "selected clock %p (%s) quot %d, calc %d\n",
732 best->clksrc, best->clksrc->name, best->quot, best->calc);
733
734 /* store results to pass back */
735
736 *clksrc = best->clksrc;
737 *clk = best->src;
738
739 return best->quot;
740 }
741
742 static void s3c24xx_serial_set_termios(struct uart_port *port,
743 struct termios *termios,
744 struct termios *old)
745 {
746 struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
747 struct s3c24xx_uart_port *ourport = to_ourport(port);
748 struct s3c24xx_uart_clksrc *clksrc = NULL;
749 struct clk *clk = NULL;
750 unsigned long flags;
751 unsigned int baud, quot;
752 unsigned int ulcon;
753 unsigned int umcon;
754
755 /*
756 * We don't support modem control lines.
757 */
758 termios->c_cflag &= ~(HUPCL | CMSPAR);
759 termios->c_cflag |= CLOCAL;
760
761 /*
762 * Ask the core to calculate the divisor for us.
763 */
764
765 baud = uart_get_baud_rate(port, termios, old, 0, 115200*8);
766
767 if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
768 quot = port->custom_divisor;
769 else
770 quot = s3c24xx_serial_getclk(port, &clksrc, &clk, baud);
771
772 /* check to see if we need to change clock source */
773
774 if (ourport->clksrc != clksrc || ourport->baudclk != clk) {
775 s3c24xx_serial_setsource(port, clksrc);
776
777 if (ourport->baudclk != NULL && !IS_ERR(ourport->baudclk)) {
778 clk_disable(ourport->baudclk);
779 ourport->baudclk = NULL;
780 }
781
782 clk_enable(clk);
783
784 ourport->clksrc = clksrc;
785 ourport->baudclk = clk;
786 }
787
788 switch (termios->c_cflag & CSIZE) {
789 case CS5:
790 dbg("config: 5bits/char\n");
791 ulcon = S3C2410_LCON_CS5;
792 break;
793 case CS6:
794 dbg("config: 6bits/char\n");
795 ulcon = S3C2410_LCON_CS6;
796 break;
797 case CS7:
798 dbg("config: 7bits/char\n");
799 ulcon = S3C2410_LCON_CS7;
800 break;
801 case CS8:
802 default:
803 dbg("config: 8bits/char\n");
804 ulcon = S3C2410_LCON_CS8;
805 break;
806 }
807
808 /* preserve original lcon IR settings */
809 ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
810
811 if (termios->c_cflag & CSTOPB)
812 ulcon |= S3C2410_LCON_STOPB;
813
814 umcon = (termios->c_cflag & CRTSCTS) ? S3C2410_UMCOM_AFC : 0;
815
816 if (termios->c_cflag & PARENB) {
817 if (termios->c_cflag & PARODD)
818 ulcon |= S3C2410_LCON_PODD;
819 else
820 ulcon |= S3C2410_LCON_PEVEN;
821 } else {
822 ulcon |= S3C2410_LCON_PNONE;
823 }
824
825 spin_lock_irqsave(&port->lock, flags);
826
827 dbg("setting ulcon to %08x, brddiv to %d\n", ulcon, quot);
828
829 wr_regl(port, S3C2410_ULCON, ulcon);
830 wr_regl(port, S3C2410_UBRDIV, quot);
831 wr_regl(port, S3C2410_UMCON, umcon);
832
833 dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
834 rd_regl(port, S3C2410_ULCON),
835 rd_regl(port, S3C2410_UCON),
836 rd_regl(port, S3C2410_UFCON));
837
838 /*
839 * Update the per-port timeout.
840 */
841 uart_update_timeout(port, termios->c_cflag, baud);
842
843 /*
844 * Which character status flags are we interested in?
845 */
846 port->read_status_mask = S3C2410_UERSTAT_OVERRUN;
847 if (termios->c_iflag & INPCK)
848 port->read_status_mask |= S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_PARITY;
849
850 /*
851 * Which character status flags should we ignore?
852 */
853 port->ignore_status_mask = 0;
854 if (termios->c_iflag & IGNPAR)
855 port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN;
856 if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
857 port->ignore_status_mask |= S3C2410_UERSTAT_FRAME;
858
859 /*
860 * Ignore all characters if CREAD is not set.
861 */
862 if ((termios->c_cflag & CREAD) == 0)
863 port->ignore_status_mask |= RXSTAT_DUMMY_READ;
864
865 spin_unlock_irqrestore(&port->lock, flags);
866 }
867
868 static const char *s3c24xx_serial_type(struct uart_port *port)
869 {
870 switch (port->type) {
871 case PORT_S3C2410:
872 return "S3C2410";
873 case PORT_S3C2440:
874 return "S3C2440";
875 default:
876 return NULL;
877 }
878 }
879
880 #define MAP_SIZE (0x100)
881
882 static void s3c24xx_serial_release_port(struct uart_port *port)
883 {
884 release_mem_region(port->mapbase, MAP_SIZE);
885 }
886
887 static int s3c24xx_serial_request_port(struct uart_port *port)
888 {
889 const char *name = s3c24xx_serial_portname(port);
890 return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY;
891 }
892
893 static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
894 {
895 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
896
897 if (flags & UART_CONFIG_TYPE &&
898 s3c24xx_serial_request_port(port) == 0)
899 port->type = info->type;
900 }
901
902 /*
903 * verify the new serial_struct (for TIOCSSERIAL).
904 */
905 static int
906 s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
907 {
908 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
909
910 if (ser->type != PORT_UNKNOWN && ser->type != info->type)
911 return -EINVAL;
912
913 return 0;
914 }
915
916
917 #ifdef CONFIG_SERIAL_S3C2410_CONSOLE
918
919 static struct console s3c24xx_serial_console;
920
921 #define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
922 #else
923 #define S3C24XX_SERIAL_CONSOLE NULL
924 #endif
925
926 static struct uart_ops s3c24xx_serial_ops = {
927 .pm = s3c24xx_serial_pm,
928 .tx_empty = s3c24xx_serial_tx_empty,
929 .get_mctrl = s3c24xx_serial_get_mctrl,
930 .set_mctrl = s3c24xx_serial_set_mctrl,
931 .stop_tx = s3c24xx_serial_stop_tx,
932 .start_tx = s3c24xx_serial_start_tx,
933 .stop_rx = s3c24xx_serial_stop_rx,
934 .enable_ms = s3c24xx_serial_enable_ms,
935 .break_ctl = s3c24xx_serial_break_ctl,
936 .startup = s3c24xx_serial_startup,
937 .shutdown = s3c24xx_serial_shutdown,
938 .set_termios = s3c24xx_serial_set_termios,
939 .type = s3c24xx_serial_type,
940 .release_port = s3c24xx_serial_release_port,
941 .request_port = s3c24xx_serial_request_port,
942 .config_port = s3c24xx_serial_config_port,
943 .verify_port = s3c24xx_serial_verify_port,
944 };
945
946
947 static struct uart_driver s3c24xx_uart_drv = {
948 .owner = THIS_MODULE,
949 .dev_name = "s3c2410_serial",
950 .nr = 3,
951 .cons = S3C24XX_SERIAL_CONSOLE,
952 .driver_name = S3C24XX_SERIAL_NAME,
953 .devfs_name = S3C24XX_SERIAL_DEVFS,
954 .major = S3C24XX_SERIAL_MAJOR,
955 .minor = S3C24XX_SERIAL_MINOR,
956 };
957
958 static struct s3c24xx_uart_port s3c24xx_serial_ports[NR_PORTS] = {
959 [0] = {
960 .port = {
961 .lock = SPIN_LOCK_UNLOCKED,
962 .iotype = UPIO_MEM,
963 .irq = IRQ_S3CUART_RX0,
964 .uartclk = 0,
965 .fifosize = 16,
966 .ops = &s3c24xx_serial_ops,
967 .flags = UPF_BOOT_AUTOCONF,
968 .line = 0,
969 }
970 },
971 [1] = {
972 .port = {
973 .lock = SPIN_LOCK_UNLOCKED,
974 .iotype = UPIO_MEM,
975 .irq = IRQ_S3CUART_RX1,
976 .uartclk = 0,
977 .fifosize = 16,
978 .ops = &s3c24xx_serial_ops,
979 .flags = UPF_BOOT_AUTOCONF,
980 .line = 1,
981 }
982 },
983 #if NR_PORTS > 2
984
985 [2] = {
986 .port = {
987 .lock = SPIN_LOCK_UNLOCKED,
988 .iotype = UPIO_MEM,
989 .irq = IRQ_S3CUART_RX2,
990 .uartclk = 0,
991 .fifosize = 16,
992 .ops = &s3c24xx_serial_ops,
993 .flags = UPF_BOOT_AUTOCONF,
994 .line = 2,
995 }
996 }
997 #endif
998 };
999
1000 /* s3c24xx_serial_resetport
1001 *
1002 * wrapper to call the specific reset for this port (reset the fifos
1003 * and the settings)
1004 */
1005
1006 static inline int s3c24xx_serial_resetport(struct uart_port * port,
1007 struct s3c2410_uartcfg *cfg)
1008 {
1009 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1010
1011 return (info->reset_port)(port, cfg);
1012 }
1013
1014 /* s3c24xx_serial_init_port
1015 *
1016 * initialise a single serial port from the platform device given
1017 */
1018
1019 static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
1020 struct s3c24xx_uart_info *info,
1021 struct platform_device *platdev)
1022 {
1023 struct uart_port *port = &ourport->port;
1024 struct s3c2410_uartcfg *cfg;
1025 struct resource *res;
1026
1027 dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev);
1028
1029 if (platdev == NULL)
1030 return -ENODEV;
1031
1032 cfg = s3c24xx_dev_to_cfg(&platdev->dev);
1033
1034 if (port->mapbase != 0)
1035 return 0;
1036
1037 if (cfg->hwport > 3)
1038 return -EINVAL;
1039
1040 /* setup info for port */
1041 port->dev = &platdev->dev;
1042 ourport->info = info;
1043
1044 /* copy the info in from provided structure */
1045 ourport->port.fifosize = info->fifosize;
1046
1047 dbg("s3c24xx_serial_init_port: %p (hw %d)...\n", port, cfg->hwport);
1048
1049 port->uartclk = 1;
1050
1051 if (cfg->uart_flags & UPF_CONS_FLOW) {
1052 dbg("s3c24xx_serial_init_port: enabling flow control\n");
1053 port->flags |= UPF_CONS_FLOW;
1054 }
1055
1056 /* sort our the physical and virtual addresses for each UART */
1057
1058 res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
1059 if (res == NULL) {
1060 printk(KERN_ERR "failed to find memory resource for uart\n");
1061 return -EINVAL;
1062 }
1063
1064 dbg("resource %p (%lx..%lx)\n", res, res->start, res->end);
1065
1066 port->mapbase = res->start;
1067 port->membase = S3C24XX_VA_UART + (res->start - S3C24XX_PA_UART);
1068 port->irq = platform_get_irq(platdev, 0);
1069
1070 ourport->clk = clk_get(&platdev->dev, "uart");
1071
1072 dbg("port: map=%08x, mem=%08x, irq=%d, clock=%ld\n",
1073 port->mapbase, port->membase, port->irq, port->uartclk);
1074
1075 /* reset the fifos (and setup the uart) */
1076 s3c24xx_serial_resetport(port, cfg);
1077 return 0;
1078 }
1079
1080 /* Device driver serial port probe */
1081
1082 static int probe_index = 0;
1083
1084 static int s3c24xx_serial_probe(struct platform_device *dev,
1085 struct s3c24xx_uart_info *info)
1086 {
1087 struct s3c24xx_uart_port *ourport;
1088 int ret;
1089
1090 dbg("s3c24xx_serial_probe(%p, %p) %d\n", dev, info, probe_index);
1091
1092 ourport = &s3c24xx_serial_ports[probe_index];
1093 probe_index++;
1094
1095 dbg("%s: initialising port %p...\n", __FUNCTION__, ourport);
1096
1097 ret = s3c24xx_serial_init_port(ourport, info, dev);
1098 if (ret < 0)
1099 goto probe_err;
1100
1101 dbg("%s: adding port\n", __FUNCTION__);
1102 uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
1103 platform_set_drvdata(dev, &ourport->port);
1104
1105 return 0;
1106
1107 probe_err:
1108 return ret;
1109 }
1110
1111 static int s3c24xx_serial_remove(struct platform_device *dev)
1112 {
1113 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1114
1115 if (port)
1116 uart_remove_one_port(&s3c24xx_uart_drv, port);
1117
1118 return 0;
1119 }
1120
1121 /* UART power management code */
1122
1123 #ifdef CONFIG_PM
1124
1125 static int s3c24xx_serial_suspend(struct platform_device *dev, pm_message_t state)
1126 {
1127 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1128
1129 if (port)
1130 uart_suspend_port(&s3c24xx_uart_drv, port);
1131
1132 return 0;
1133 }
1134
1135 static int s3c24xx_serial_resume(struct platform_device *dev)
1136 {
1137 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1138 struct s3c24xx_uart_port *ourport = to_ourport(port);
1139
1140 if (port) {
1141 clk_enable(ourport->clk);
1142 s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
1143 clk_disable(ourport->clk);
1144
1145 uart_resume_port(&s3c24xx_uart_drv, port);
1146 }
1147
1148 return 0;
1149 }
1150
1151 #else
1152 #define s3c24xx_serial_suspend NULL
1153 #define s3c24xx_serial_resume NULL
1154 #endif
1155
1156 static int s3c24xx_serial_init(struct platform_driver *drv,
1157 struct s3c24xx_uart_info *info)
1158 {
1159 dbg("s3c24xx_serial_init(%p,%p)\n", drv, info);
1160 return platform_driver_register(drv);
1161 }
1162
1163
1164 /* now comes the code to initialise either the s3c2410 or s3c2440 serial
1165 * port information
1166 */
1167
1168 /* cpu specific variations on the serial port support */
1169
1170 #ifdef CONFIG_CPU_S3C2400
1171
1172 static int s3c2400_serial_getsource(struct uart_port *port,
1173 struct s3c24xx_uart_clksrc *clk)
1174 {
1175 clk->divisor = 1;
1176 clk->name = "pclk";
1177
1178 return 0;
1179 }
1180
1181 static int s3c2400_serial_setsource(struct uart_port *port,
1182 struct s3c24xx_uart_clksrc *clk)
1183 {
1184 return 0;
1185 }
1186
1187 static int s3c2400_serial_resetport(struct uart_port *port,
1188 struct s3c2410_uartcfg *cfg)
1189 {
1190 dbg("s3c2400_serial_resetport: port=%p (%08lx), cfg=%p\n",
1191 port, port->mapbase, cfg);
1192
1193 wr_regl(port, S3C2410_UCON, cfg->ucon);
1194 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
1195
1196 /* reset both fifos */
1197
1198 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1199 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1200
1201 return 0;
1202 }
1203
1204 static struct s3c24xx_uart_info s3c2400_uart_inf = {
1205 .name = "Samsung S3C2400 UART",
1206 .type = PORT_S3C2400,
1207 .fifosize = 16,
1208 .rx_fifomask = S3C2410_UFSTAT_RXMASK,
1209 .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
1210 .rx_fifofull = S3C2410_UFSTAT_RXFULL,
1211 .tx_fifofull = S3C2410_UFSTAT_TXFULL,
1212 .tx_fifomask = S3C2410_UFSTAT_TXMASK,
1213 .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
1214 .get_clksrc = s3c2400_serial_getsource,
1215 .set_clksrc = s3c2400_serial_setsource,
1216 .reset_port = s3c2400_serial_resetport,
1217 };
1218
1219 static int s3c2400_serial_probe(struct platform_device *dev)
1220 {
1221 return s3c24xx_serial_probe(dev, &s3c2400_uart_inf);
1222 }
1223
1224 static struct platform_driver s3c2400_serial_drv = {
1225 .probe = s3c2400_serial_probe,
1226 .remove = s3c24xx_serial_remove,
1227 .suspend = s3c24xx_serial_suspend,
1228 .resume = s3c24xx_serial_resume,
1229 .driver = {
1230 .name = "s3c2400-uart",
1231 .owner = THIS_MODULE,
1232 },
1233 };
1234
1235 static inline int s3c2400_serial_init(void)
1236 {
1237 return s3c24xx_serial_init(&s3c2400_serial_drv, &s3c2400_uart_inf);
1238 }
1239
1240 static inline void s3c2400_serial_exit(void)
1241 {
1242 platform_driver_unregister(&s3c2400_serial_drv);
1243 }
1244
1245 #define s3c2400_uart_inf_at &s3c2400_uart_inf
1246 #else
1247
1248 static inline int s3c2400_serial_init(void)
1249 {
1250 return 0;
1251 }
1252
1253 static inline void s3c2400_serial_exit(void)
1254 {
1255 }
1256
1257 #define s3c2400_uart_inf_at NULL
1258
1259 #endif /* CONFIG_CPU_S3C2400 */
1260
1261 /* S3C2410 support */
1262
1263 #ifdef CONFIG_CPU_S3C2410
1264
1265 static int s3c2410_serial_setsource(struct uart_port *port,
1266 struct s3c24xx_uart_clksrc *clk)
1267 {
1268 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1269
1270 if (strcmp(clk->name, "uclk") == 0)
1271 ucon |= S3C2410_UCON_UCLK;
1272 else
1273 ucon &= ~S3C2410_UCON_UCLK;
1274
1275 wr_regl(port, S3C2410_UCON, ucon);
1276 return 0;
1277 }
1278
1279 static int s3c2410_serial_getsource(struct uart_port *port,
1280 struct s3c24xx_uart_clksrc *clk)
1281 {
1282 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1283
1284 clk->divisor = 1;
1285 clk->name = (ucon & S3C2410_UCON_UCLK) ? "uclk" : "pclk";
1286
1287 return 0;
1288 }
1289
1290 static int s3c2410_serial_resetport(struct uart_port *port,
1291 struct s3c2410_uartcfg *cfg)
1292 {
1293 dbg("s3c2410_serial_resetport: port=%p (%08lx), cfg=%p\n",
1294 port, port->mapbase, cfg);
1295
1296 wr_regl(port, S3C2410_UCON, cfg->ucon);
1297 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
1298
1299 /* reset both fifos */
1300
1301 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1302 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1303
1304 return 0;
1305 }
1306
1307 static struct s3c24xx_uart_info s3c2410_uart_inf = {
1308 .name = "Samsung S3C2410 UART",
1309 .type = PORT_S3C2410,
1310 .fifosize = 16,
1311 .rx_fifomask = S3C2410_UFSTAT_RXMASK,
1312 .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
1313 .rx_fifofull = S3C2410_UFSTAT_RXFULL,
1314 .tx_fifofull = S3C2410_UFSTAT_TXFULL,
1315 .tx_fifomask = S3C2410_UFSTAT_TXMASK,
1316 .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
1317 .get_clksrc = s3c2410_serial_getsource,
1318 .set_clksrc = s3c2410_serial_setsource,
1319 .reset_port = s3c2410_serial_resetport,
1320 };
1321
1322 /* device management */
1323
1324 static int s3c2410_serial_probe(struct platform_device *dev)
1325 {
1326 return s3c24xx_serial_probe(dev, &s3c2410_uart_inf);
1327 }
1328
1329 static struct platform_driver s3c2410_serial_drv = {
1330 .probe = s3c2410_serial_probe,
1331 .remove = s3c24xx_serial_remove,
1332 .suspend = s3c24xx_serial_suspend,
1333 .resume = s3c24xx_serial_resume,
1334 .driver = {
1335 .name = "s3c2410-uart",
1336 .owner = THIS_MODULE,
1337 },
1338 };
1339
1340 static inline int s3c2410_serial_init(void)
1341 {
1342 return s3c24xx_serial_init(&s3c2410_serial_drv, &s3c2410_uart_inf);
1343 }
1344
1345 static inline void s3c2410_serial_exit(void)
1346 {
1347 platform_driver_unregister(&s3c2410_serial_drv);
1348 }
1349
1350 #define s3c2410_uart_inf_at &s3c2410_uart_inf
1351 #else
1352
1353 static inline int s3c2410_serial_init(void)
1354 {
1355 return 0;
1356 }
1357
1358 static inline void s3c2410_serial_exit(void)
1359 {
1360 }
1361
1362 #define s3c2410_uart_inf_at NULL
1363
1364 #endif /* CONFIG_CPU_S3C2410 */
1365
1366 #ifdef CONFIG_CPU_S3C2440
1367
1368 static int s3c2440_serial_setsource(struct uart_port *port,
1369 struct s3c24xx_uart_clksrc *clk)
1370 {
1371 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1372
1373 // todo - proper fclk<>nonfclk switch //
1374
1375 ucon &= ~S3C2440_UCON_CLKMASK;
1376
1377 if (strcmp(clk->name, "uclk") == 0)
1378 ucon |= S3C2440_UCON_UCLK;
1379 else if (strcmp(clk->name, "pclk") == 0)
1380 ucon |= S3C2440_UCON_PCLK;
1381 else if (strcmp(clk->name, "fclk") == 0)
1382 ucon |= S3C2440_UCON_FCLK;
1383 else {
1384 printk(KERN_ERR "unknown clock source %s\n", clk->name);
1385 return -EINVAL;
1386 }
1387
1388 wr_regl(port, S3C2410_UCON, ucon);
1389 return 0;
1390 }
1391
1392
1393 static int s3c2440_serial_getsource(struct uart_port *port,
1394 struct s3c24xx_uart_clksrc *clk)
1395 {
1396 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1397 unsigned long ucon0, ucon1, ucon2;
1398
1399 switch (ucon & S3C2440_UCON_CLKMASK) {
1400 case S3C2440_UCON_UCLK:
1401 clk->divisor = 1;
1402 clk->name = "uclk";
1403 break;
1404
1405 case S3C2440_UCON_PCLK:
1406 case S3C2440_UCON_PCLK2:
1407 clk->divisor = 1;
1408 clk->name = "pclk";
1409 break;
1410
1411 case S3C2440_UCON_FCLK:
1412 /* the fun of calculating the uart divisors on
1413 * the s3c2440 */
1414
1415 ucon0 = __raw_readl(S3C24XX_VA_UART0 + S3C2410_UCON);
1416 ucon1 = __raw_readl(S3C24XX_VA_UART1 + S3C2410_UCON);
1417 ucon2 = __raw_readl(S3C24XX_VA_UART2 + S3C2410_UCON);
1418
1419 printk("ucons: %08lx, %08lx, %08lx\n", ucon0, ucon1, ucon2);
1420
1421 ucon0 &= S3C2440_UCON0_DIVMASK;
1422 ucon1 &= S3C2440_UCON1_DIVMASK;
1423 ucon2 &= S3C2440_UCON2_DIVMASK;
1424
1425 if (ucon0 != 0) {
1426 clk->divisor = ucon0 >> S3C2440_UCON_DIVSHIFT;
1427 clk->divisor += 6;
1428 } else if (ucon1 != 0) {
1429 clk->divisor = ucon1 >> S3C2440_UCON_DIVSHIFT;
1430 clk->divisor += 21;
1431 } else if (ucon2 != 0) {
1432 clk->divisor = ucon2 >> S3C2440_UCON_DIVSHIFT;
1433 clk->divisor += 36;
1434 } else {
1435 /* manual calims 44, seems to be 9 */
1436 clk->divisor = 9;
1437 }
1438
1439 clk->name = "fclk";
1440 break;
1441 }
1442
1443 return 0;
1444 }
1445
1446 static int s3c2440_serial_resetport(struct uart_port *port,
1447 struct s3c2410_uartcfg *cfg)
1448 {
1449 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1450
1451 dbg("s3c2440_serial_resetport: port=%p (%08lx), cfg=%p\n",
1452 port, port->mapbase, cfg);
1453
1454 /* ensure we don't change the clock settings... */
1455
1456 ucon &= (S3C2440_UCON0_DIVMASK | (3<<10));
1457
1458 wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
1459 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
1460
1461 /* reset both fifos */
1462
1463 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1464 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1465
1466 return 0;
1467 }
1468
1469 static struct s3c24xx_uart_info s3c2440_uart_inf = {
1470 .name = "Samsung S3C2440 UART",
1471 .type = PORT_S3C2440,
1472 .fifosize = 64,
1473 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1474 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1475 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1476 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1477 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1478 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1479 .get_clksrc = s3c2440_serial_getsource,
1480 .set_clksrc = s3c2440_serial_setsource,
1481 .reset_port = s3c2440_serial_resetport,
1482 };
1483
1484 /* device management */
1485
1486 static int s3c2440_serial_probe(struct platform_device *dev)
1487 {
1488 dbg("s3c2440_serial_probe: dev=%p\n", dev);
1489 return s3c24xx_serial_probe(dev, &s3c2440_uart_inf);
1490 }
1491
1492 static struct platform_driver s3c2440_serial_drv = {
1493 .probe = s3c2440_serial_probe,
1494 .remove = s3c24xx_serial_remove,
1495 .suspend = s3c24xx_serial_suspend,
1496 .resume = s3c24xx_serial_resume,
1497 .driver = {
1498 .name = "s3c2440-uart",
1499 .owner = THIS_MODULE,
1500 },
1501 };
1502
1503
1504 static inline int s3c2440_serial_init(void)
1505 {
1506 return s3c24xx_serial_init(&s3c2440_serial_drv, &s3c2440_uart_inf);
1507 }
1508
1509 static inline void s3c2440_serial_exit(void)
1510 {
1511 platform_driver_unregister(&s3c2440_serial_drv);
1512 }
1513
1514 #define s3c2440_uart_inf_at &s3c2440_uart_inf
1515 #else
1516
1517 static inline int s3c2440_serial_init(void)
1518 {
1519 return 0;
1520 }
1521
1522 static inline void s3c2440_serial_exit(void)
1523 {
1524 }
1525
1526 #define s3c2440_uart_inf_at NULL
1527 #endif /* CONFIG_CPU_S3C2440 */
1528
1529 /* module initialisation code */
1530
1531 static int __init s3c24xx_serial_modinit(void)
1532 {
1533 int ret;
1534
1535 ret = uart_register_driver(&s3c24xx_uart_drv);
1536 if (ret < 0) {
1537 printk(KERN_ERR "failed to register UART driver\n");
1538 return -1;
1539 }
1540
1541 s3c2400_serial_init();
1542 s3c2410_serial_init();
1543 s3c2440_serial_init();
1544
1545 return 0;
1546 }
1547
1548 static void __exit s3c24xx_serial_modexit(void)
1549 {
1550 s3c2400_serial_exit();
1551 s3c2410_serial_exit();
1552 s3c2440_serial_exit();
1553
1554 uart_unregister_driver(&s3c24xx_uart_drv);
1555 }
1556
1557
1558 module_init(s3c24xx_serial_modinit);
1559 module_exit(s3c24xx_serial_modexit);
1560
1561 /* Console code */
1562
1563 #ifdef CONFIG_SERIAL_S3C2410_CONSOLE
1564
1565 static struct uart_port *cons_uart;
1566
1567 static int
1568 s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
1569 {
1570 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1571 unsigned long ufstat, utrstat;
1572
1573 if (ufcon & S3C2410_UFCON_FIFOMODE) {
1574 /* fifo mode - check ammount of data in fifo registers... */
1575
1576 ufstat = rd_regl(port, S3C2410_UFSTAT);
1577 return (ufstat & info->tx_fifofull) ? 0 : 1;
1578 }
1579
1580 /* in non-fifo mode, we go and use the tx buffer empty */
1581
1582 utrstat = rd_regl(port, S3C2410_UTRSTAT);
1583 return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
1584 }
1585
1586 static void
1587 s3c24xx_serial_console_write(struct console *co, const char *s,
1588 unsigned int count)
1589 {
1590 int i;
1591 unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON);
1592
1593 for (i = 0; i < count; i++) {
1594 while (!s3c24xx_serial_console_txrdy(cons_uart, ufcon))
1595 barrier();
1596
1597 wr_regb(cons_uart, S3C2410_UTXH, s[i]);
1598
1599 if (s[i] == '\n') {
1600 while (!s3c24xx_serial_console_txrdy(cons_uart, ufcon))
1601 barrier();
1602
1603 wr_regb(cons_uart, S3C2410_UTXH, '\r');
1604 }
1605 }
1606 }
1607
1608 static void __init
1609 s3c24xx_serial_get_options(struct uart_port *port, int *baud,
1610 int *parity, int *bits)
1611 {
1612 struct s3c24xx_uart_clksrc clksrc;
1613 struct clk *clk;
1614 unsigned int ulcon;
1615 unsigned int ucon;
1616 unsigned int ubrdiv;
1617 unsigned long rate;
1618
1619 ulcon = rd_regl(port, S3C2410_ULCON);
1620 ucon = rd_regl(port, S3C2410_UCON);
1621 ubrdiv = rd_regl(port, S3C2410_UBRDIV);
1622
1623 dbg("s3c24xx_serial_get_options: port=%p\n"
1624 "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
1625 port, ulcon, ucon, ubrdiv);
1626
1627 if ((ucon & 0xf) != 0) {
1628 /* consider the serial port configured if the tx/rx mode set */
1629
1630 switch (ulcon & S3C2410_LCON_CSMASK) {
1631 case S3C2410_LCON_CS5:
1632 *bits = 5;
1633 break;
1634 case S3C2410_LCON_CS6:
1635 *bits = 6;
1636 break;
1637 case S3C2410_LCON_CS7:
1638 *bits = 7;
1639 break;
1640 default:
1641 case S3C2410_LCON_CS8:
1642 *bits = 8;
1643 break;
1644 }
1645
1646 switch (ulcon & S3C2410_LCON_PMASK) {
1647 case S3C2410_LCON_PEVEN:
1648 *parity = 'e';
1649 break;
1650
1651 case S3C2410_LCON_PODD:
1652 *parity = 'o';
1653 break;
1654
1655 case S3C2410_LCON_PNONE:
1656 default:
1657 *parity = 'n';
1658 }
1659
1660 /* now calculate the baud rate */
1661
1662 s3c24xx_serial_getsource(port, &clksrc);
1663
1664 clk = clk_get(port->dev, clksrc.name);
1665 if (!IS_ERR(clk) && clk != NULL)
1666 rate = clk_get_rate(clk) / clksrc.divisor;
1667 else
1668 rate = 1;
1669
1670
1671 *baud = rate / ( 16 * (ubrdiv + 1));
1672 dbg("calculated baud %d\n", *baud);
1673 }
1674
1675 }
1676
1677 /* s3c24xx_serial_init_ports
1678 *
1679 * initialise the serial ports from the machine provided initialisation
1680 * data.
1681 */
1682
1683 static int s3c24xx_serial_init_ports(struct s3c24xx_uart_info *info)
1684 {
1685 struct s3c24xx_uart_port *ptr = s3c24xx_serial_ports;
1686 struct platform_device **platdev_ptr;
1687 int i;
1688
1689 dbg("s3c24xx_serial_init_ports: initialising ports...\n");
1690
1691 platdev_ptr = s3c24xx_uart_devs;
1692
1693 for (i = 0; i < NR_PORTS; i++, ptr++, platdev_ptr++) {
1694 s3c24xx_serial_init_port(ptr, info, *platdev_ptr);
1695 }
1696
1697 return 0;
1698 }
1699
1700 static int __init
1701 s3c24xx_serial_console_setup(struct console *co, char *options)
1702 {
1703 struct uart_port *port;
1704 int baud = 9600;
1705 int bits = 8;
1706 int parity = 'n';
1707 int flow = 'n';
1708
1709 dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n",
1710 co, co->index, options);
1711
1712 /* is this a valid port */
1713
1714 if (co->index == -1 || co->index >= NR_PORTS)
1715 co->index = 0;
1716
1717 port = &s3c24xx_serial_ports[co->index].port;
1718
1719 /* is the port configured? */
1720
1721 if (port->mapbase == 0x0) {
1722 co->index = 0;
1723 port = &s3c24xx_serial_ports[co->index].port;
1724 }
1725
1726 cons_uart = port;
1727
1728 dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index);
1729
1730 /*
1731 * Check whether an invalid uart number has been specified, and
1732 * if so, search for the first available port that does have
1733 * console support.
1734 */
1735 if (options)
1736 uart_parse_options(options, &baud, &parity, &bits, &flow);
1737 else
1738 s3c24xx_serial_get_options(port, &baud, &parity, &bits);
1739
1740 dbg("s3c24xx_serial_console_setup: baud %d\n", baud);
1741
1742 return uart_set_options(port, co, baud, parity, bits, flow);
1743 }
1744
1745 /* s3c24xx_serial_initconsole
1746 *
1747 * initialise the console from one of the uart drivers
1748 */
1749
1750 static struct console s3c24xx_serial_console =
1751 {
1752 .name = S3C24XX_SERIAL_NAME,
1753 .device = uart_console_device,
1754 .flags = CON_PRINTBUFFER,
1755 .index = -1,
1756 .write = s3c24xx_serial_console_write,
1757 .setup = s3c24xx_serial_console_setup
1758 };
1759
1760 static int s3c24xx_serial_initconsole(void)
1761 {
1762 struct s3c24xx_uart_info *info;
1763 struct platform_device *dev = s3c24xx_uart_devs[0];
1764
1765 dbg("s3c24xx_serial_initconsole\n");
1766
1767 /* select driver based on the cpu */
1768
1769 if (dev == NULL) {
1770 printk(KERN_ERR "s3c24xx: no devices for console init\n");
1771 return 0;
1772 }
1773
1774 if (strcmp(dev->name, "s3c2400-uart") == 0) {
1775 info = s3c2400_uart_inf_at;
1776 } else if (strcmp(dev->name, "s3c2410-uart") == 0) {
1777 info = s3c2410_uart_inf_at;
1778 } else if (strcmp(dev->name, "s3c2440-uart") == 0) {
1779 info = s3c2440_uart_inf_at;
1780 } else {
1781 printk(KERN_ERR "s3c24xx: no driver for %s\n", dev->name);
1782 return 0;
1783 }
1784
1785 if (info == NULL) {
1786 printk(KERN_ERR "s3c24xx: no driver for console\n");
1787 return 0;
1788 }
1789
1790 s3c24xx_serial_console.data = &s3c24xx_uart_drv;
1791 s3c24xx_serial_init_ports(info);
1792
1793 register_console(&s3c24xx_serial_console);
1794 return 0;
1795 }
1796
1797 console_initcall(s3c24xx_serial_initconsole);
1798
1799 #endif /* CONFIG_SERIAL_S3C2410_CONSOLE */
1800
1801 MODULE_LICENSE("GPL");
1802 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
1803 MODULE_DESCRIPTION("Samsung S3C2410/S3C2440 Serial port driver");
Support for the Chinese Samsung S3C2440 based development boards