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3C509: rx_bytes should not be increased when alloc_skb failed
[linux-2.6/mini2440.git] / drivers / serial / s3c2410.c
blob2b6a013639e6db103656787fb567f168e8e802b3
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
59 #if defined(CONFIG_SERIAL_S3C2410_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
60 #define SUPPORT_SYSRQ
61 #endif
62
63 #include <linux/module.h>
64 #include <linux/ioport.h>
65 #include <linux/platform_device.h>
66 #include <linux/init.h>
67 #include <linux/sysrq.h>
68 #include <linux/console.h>
69 #include <linux/tty.h>
70 #include <linux/tty_flip.h>
71 #include <linux/serial_core.h>
72 #include <linux/serial.h>
73 #include <linux/delay.h>
74 #include <linux/clk.h>
75
76 #include <asm/io.h>
77 #include <asm/irq.h>
78
79 #include <asm/hardware.h>
80
81 #include <asm/plat-s3c/regs-serial.h>
82 #include <asm/arch/regs-gpio.h>
83
84 /* structures */
85
86 struct s3c24xx_uart_info {
87 char *name;
88 unsigned int type;
89 unsigned int fifosize;
90 unsigned long rx_fifomask;
91 unsigned long rx_fifoshift;
92 unsigned long rx_fifofull;
93 unsigned long tx_fifomask;
94 unsigned long tx_fifoshift;
95 unsigned long tx_fifofull;
96
97 /* clock source control */
98
99 int (*get_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk);
100 int (*set_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk);
101
102 /* uart controls */
103 int (*reset_port)(struct uart_port *, struct s3c2410_uartcfg *);
104 };
105
106 struct s3c24xx_uart_port {
107 unsigned char rx_claimed;
108 unsigned char tx_claimed;
109
110 struct s3c24xx_uart_info *info;
111 struct s3c24xx_uart_clksrc *clksrc;
112 struct clk *clk;
113 struct clk *baudclk;
114 struct uart_port port;
115 };
116
117
118 /* configuration defines */
119
120 #if 0
121 #if 1
122 /* send debug to the low-level output routines */
123
124 extern void printascii(const char *);
125
126 static void
127 s3c24xx_serial_dbg(const char *fmt, ...)
128 {
129 va_list va;
130 char buff[256];
131
132 va_start(va, fmt);
133 vsprintf(buff, fmt, va);
134 va_end(va);
135
136 printascii(buff);
137 }
138
139 #define dbg(x...) s3c24xx_serial_dbg(x)
140
141 #else
142 #define dbg(x...) printk(KERN_DEBUG "s3c24xx: ");
143 #endif
144 #else /* no debug */
145 #define dbg(x...) do {} while(0)
146 #endif
147
148 /* UART name and device definitions */
149
150 #define S3C24XX_SERIAL_NAME "ttySAC"
151 #define S3C24XX_SERIAL_MAJOR 204
152 #define S3C24XX_SERIAL_MINOR 64
153
154
155 /* conversion functions */
156
157 #define s3c24xx_dev_to_port(__dev) (struct uart_port *)dev_get_drvdata(__dev)
158 #define s3c24xx_dev_to_cfg(__dev) (struct s3c2410_uartcfg *)((__dev)->platform_data)
159
160 /* we can support 3 uarts, but not always use them */
161
162 #ifdef CONFIG_CPU_S3C2400
163 #define NR_PORTS (2)
164 #else
165 #define NR_PORTS (3)
166 #endif
167
168 /* port irq numbers */
169
170 #define TX_IRQ(port) ((port)->irq + 1)
171 #define RX_IRQ(port) ((port)->irq)
172
173 /* register access controls */
174
175 #define portaddr(port, reg) ((port)->membase + (reg))
176
177 #define rd_regb(port, reg) (__raw_readb(portaddr(port, reg)))
178 #define rd_regl(port, reg) (__raw_readl(portaddr(port, reg)))
179
180 #define wr_regb(port, reg, val) \
181 do { __raw_writeb(val, portaddr(port, reg)); } while(0)
182
183 #define wr_regl(port, reg, val) \
184 do { __raw_writel(val, portaddr(port, reg)); } while(0)
185
186 /* macros to change one thing to another */
187
188 #define tx_enabled(port) ((port)->unused[0])
189 #define rx_enabled(port) ((port)->unused[1])
190
191 /* flag to ignore all characters comming in */
192 #define RXSTAT_DUMMY_READ (0x10000000)
193
194 static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port)
195 {
196 return container_of(port, struct s3c24xx_uart_port, port);
197 }
198
199 /* translate a port to the device name */
200
201 static inline const char *s3c24xx_serial_portname(struct uart_port *port)
202 {
203 return to_platform_device(port->dev)->name;
204 }
205
206 static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
207 {
208 return (rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE);
209 }
210
211 static void s3c24xx_serial_rx_enable(struct uart_port *port)
212 {
213 unsigned long flags;
214 unsigned int ucon, ufcon;
215 int count = 10000;
216
217 spin_lock_irqsave(&port->lock, flags);
218
219 while (--count && !s3c24xx_serial_txempty_nofifo(port))
220 udelay(100);
221
222 ufcon = rd_regl(port, S3C2410_UFCON);
223 ufcon |= S3C2410_UFCON_RESETRX;
224 wr_regl(port, S3C2410_UFCON, ufcon);
225
226 ucon = rd_regl(port, S3C2410_UCON);
227 ucon |= S3C2410_UCON_RXIRQMODE;
228 wr_regl(port, S3C2410_UCON, ucon);
229
230 rx_enabled(port) = 1;
231 spin_unlock_irqrestore(&port->lock, flags);
232 }
233
234 static void s3c24xx_serial_rx_disable(struct uart_port *port)
235 {
236 unsigned long flags;
237 unsigned int ucon;
238
239 spin_lock_irqsave(&port->lock, flags);
240
241 ucon = rd_regl(port, S3C2410_UCON);
242 ucon &= ~S3C2410_UCON_RXIRQMODE;
243 wr_regl(port, S3C2410_UCON, ucon);
244
245 rx_enabled(port) = 0;
246 spin_unlock_irqrestore(&port->lock, flags);
247 }
248
249 static void s3c24xx_serial_stop_tx(struct uart_port *port)
250 {
251 if (tx_enabled(port)) {
252 disable_irq(TX_IRQ(port));
253 tx_enabled(port) = 0;
254 if (port->flags & UPF_CONS_FLOW)
255 s3c24xx_serial_rx_enable(port);
256 }
257 }
258
259 static void s3c24xx_serial_start_tx(struct uart_port *port)
260 {
261 if (!tx_enabled(port)) {
262 if (port->flags & UPF_CONS_FLOW)
263 s3c24xx_serial_rx_disable(port);
264
265 enable_irq(TX_IRQ(port));
266 tx_enabled(port) = 1;
267 }
268 }
269
270
271 static void s3c24xx_serial_stop_rx(struct uart_port *port)
272 {
273 if (rx_enabled(port)) {
274 dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
275 disable_irq(RX_IRQ(port));
276 rx_enabled(port) = 0;
277 }
278 }
279
280 static void s3c24xx_serial_enable_ms(struct uart_port *port)
281 {
282 }
283
284 static inline struct s3c24xx_uart_info *s3c24xx_port_to_info(struct uart_port *port)
285 {
286 return to_ourport(port)->info;
287 }
288
289 static inline struct s3c2410_uartcfg *s3c24xx_port_to_cfg(struct uart_port *port)
290 {
291 if (port->dev == NULL)
292 return NULL;
293
294 return (struct s3c2410_uartcfg *)port->dev->platform_data;
295 }
296
297 static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
298 unsigned long ufstat)
299 {
300 struct s3c24xx_uart_info *info = ourport->info;
301
302 if (ufstat & info->rx_fifofull)
303 return info->fifosize;
304
305 return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
306 }
307
308
309 /* ? - where has parity gone?? */
310 #define S3C2410_UERSTAT_PARITY (0x1000)
311
312 static irqreturn_t
313 s3c24xx_serial_rx_chars(int irq, void *dev_id)
314 {
315 struct s3c24xx_uart_port *ourport = dev_id;
316 struct uart_port *port = &ourport->port;
317 struct tty_struct *tty = port->info->tty;
318 unsigned int ufcon, ch, flag, ufstat, uerstat;
319 int max_count = 64;
320
321 while (max_count-- > 0) {
322 ufcon = rd_regl(port, S3C2410_UFCON);
323 ufstat = rd_regl(port, S3C2410_UFSTAT);
324
325 if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
326 break;
327
328 uerstat = rd_regl(port, S3C2410_UERSTAT);
329 ch = rd_regb(port, S3C2410_URXH);
330
331 if (port->flags & UPF_CONS_FLOW) {
332 int txe = s3c24xx_serial_txempty_nofifo(port);
333
334 if (rx_enabled(port)) {
335 if (!txe) {
336 rx_enabled(port) = 0;
337 continue;
338 }
339 } else {
340 if (txe) {
341 ufcon |= S3C2410_UFCON_RESETRX;
342 wr_regl(port, S3C2410_UFCON, ufcon);
343 rx_enabled(port) = 1;
344 goto out;
345 }
346 continue;
347 }
348 }
349
350 /* insert the character into the buffer */
351
352 flag = TTY_NORMAL;
353 port->icount.rx++;
354
355 if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) {
356 dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n",
357 ch, uerstat);
358
359 /* check for break */
360 if (uerstat & S3C2410_UERSTAT_BREAK) {
361 dbg("break!\n");
362 port->icount.brk++;
363 if (uart_handle_break(port))
364 goto ignore_char;
365 }
366
367 if (uerstat & S3C2410_UERSTAT_FRAME)
368 port->icount.frame++;
369 if (uerstat & S3C2410_UERSTAT_OVERRUN)
370 port->icount.overrun++;
371
372 uerstat &= port->read_status_mask;
373
374 if (uerstat & S3C2410_UERSTAT_BREAK)
375 flag = TTY_BREAK;
376 else if (uerstat & S3C2410_UERSTAT_PARITY)
377 flag = TTY_PARITY;
378 else if (uerstat & ( S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_OVERRUN))
379 flag = TTY_FRAME;
380 }
381
382 if (uart_handle_sysrq_char(port, ch))
383 goto ignore_char;
384
385 uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN, ch, flag);
386
387 ignore_char:
388 continue;
389 }
390 tty_flip_buffer_push(tty);
391
392 out:
393 return IRQ_HANDLED;
394 }
395
396 static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
397 {
398 struct s3c24xx_uart_port *ourport = id;
399 struct uart_port *port = &ourport->port;
400 struct circ_buf *xmit = &port->info->xmit;
401 int count = 256;
402
403 if (port->x_char) {
404 wr_regb(port, S3C2410_UTXH, port->x_char);
405 port->icount.tx++;
406 port->x_char = 0;
407 goto out;
408 }
409
410 /* if there isnt anything more to transmit, or the uart is now
411 * stopped, disable the uart and exit
412 */
413
414 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
415 s3c24xx_serial_stop_tx(port);
416 goto out;
417 }
418
419 /* try and drain the buffer... */
420
421 while (!uart_circ_empty(xmit) && count-- > 0) {
422 if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
423 break;
424
425 wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
426 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
427 port->icount.tx++;
428 }
429
430 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
431 uart_write_wakeup(port);
432
433 if (uart_circ_empty(xmit))
434 s3c24xx_serial_stop_tx(port);
435
436 out:
437 return IRQ_HANDLED;
438 }
439
440 static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
441 {
442 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
443 unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT);
444 unsigned long ufcon = rd_regl(port, S3C2410_UFCON);
445
446 if (ufcon & S3C2410_UFCON_FIFOMODE) {
447 if ((ufstat & info->tx_fifomask) != 0 ||
448 (ufstat & info->tx_fifofull))
449 return 0;
450
451 return 1;
452 }
453
454 return s3c24xx_serial_txempty_nofifo(port);
455 }
456
457 /* no modem control lines */
458 static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
459 {
460 unsigned int umstat = rd_regb(port,S3C2410_UMSTAT);
461
462 if (umstat & S3C2410_UMSTAT_CTS)
463 return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
464 else
465 return TIOCM_CAR | TIOCM_DSR;
466 }
467
468 static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
469 {
470 /* todo - possibly remove AFC and do manual CTS */
471 }
472
473 static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
474 {
475 unsigned long flags;
476 unsigned int ucon;
477
478 spin_lock_irqsave(&port->lock, flags);
479
480 ucon = rd_regl(port, S3C2410_UCON);
481
482 if (break_state)
483 ucon |= S3C2410_UCON_SBREAK;
484 else
485 ucon &= ~S3C2410_UCON_SBREAK;
486
487 wr_regl(port, S3C2410_UCON, ucon);
488
489 spin_unlock_irqrestore(&port->lock, flags);
490 }
491
492 static void s3c24xx_serial_shutdown(struct uart_port *port)
493 {
494 struct s3c24xx_uart_port *ourport = to_ourport(port);
495
496 if (ourport->tx_claimed) {
497 free_irq(TX_IRQ(port), ourport);
498 tx_enabled(port) = 0;
499 ourport->tx_claimed = 0;
500 }
501
502 if (ourport->rx_claimed) {
503 free_irq(RX_IRQ(port), ourport);
504 ourport->rx_claimed = 0;
505 rx_enabled(port) = 0;
506 }
507 }
508
509
510 static int s3c24xx_serial_startup(struct uart_port *port)
511 {
512 struct s3c24xx_uart_port *ourport = to_ourport(port);
513 int ret;
514
515 dbg("s3c24xx_serial_startup: port=%p (%08lx,%p)\n",
516 port->mapbase, port->membase);
517
518 rx_enabled(port) = 1;
519
520 ret = request_irq(RX_IRQ(port),
521 s3c24xx_serial_rx_chars, 0,
522 s3c24xx_serial_portname(port), ourport);
523
524 if (ret != 0) {
525 printk(KERN_ERR "cannot get irq %d\n", RX_IRQ(port));
526 return ret;
527 }
528
529 ourport->rx_claimed = 1;
530
531 dbg("requesting tx irq...\n");
532
533 tx_enabled(port) = 1;
534
535 ret = request_irq(TX_IRQ(port),
536 s3c24xx_serial_tx_chars, 0,
537 s3c24xx_serial_portname(port), ourport);
538
539 if (ret) {
540 printk(KERN_ERR "cannot get irq %d\n", TX_IRQ(port));
541 goto err;
542 }
543
544 ourport->tx_claimed = 1;
545
546 dbg("s3c24xx_serial_startup ok\n");
547
548 /* the port reset code should have done the correct
549 * register setup for the port controls */
550
551 return ret;
552
553 err:
554 s3c24xx_serial_shutdown(port);
555 return ret;
556 }
557
558 /* power power management control */
559
560 static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
561 unsigned int old)
562 {
563 struct s3c24xx_uart_port *ourport = to_ourport(port);
564
565 switch (level) {
566 case 3:
567 if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL)
568 clk_disable(ourport->baudclk);
569
570 clk_disable(ourport->clk);
571 break;
572
573 case 0:
574 clk_enable(ourport->clk);
575
576 if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL)
577 clk_enable(ourport->baudclk);
578
579 break;
580 default:
581 printk(KERN_ERR "s3c24xx_serial: unknown pm %d\n", level);
582 }
583 }
584
585 /* baud rate calculation
586 *
587 * The UARTs on the S3C2410/S3C2440 can take their clocks from a number
588 * of different sources, including the peripheral clock ("pclk") and an
589 * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk")
590 * with a programmable extra divisor.
591 *
592 * The following code goes through the clock sources, and calculates the
593 * baud clocks (and the resultant actual baud rates) and then tries to
594 * pick the closest one and select that.
595 *
596 */
597
598
599 #define MAX_CLKS (8)
600
601 static struct s3c24xx_uart_clksrc tmp_clksrc = {
602 .name = "pclk",
603 .min_baud = 0,
604 .max_baud = 0,
605 .divisor = 1,
606 };
607
608 static inline int
609 s3c24xx_serial_getsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c)
610 {
611 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
612
613 return (info->get_clksrc)(port, c);
614 }
615
616 static inline int
617 s3c24xx_serial_setsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c)
618 {
619 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
620
621 return (info->set_clksrc)(port, c);
622 }
623
624 struct baud_calc {
625 struct s3c24xx_uart_clksrc *clksrc;
626 unsigned int calc;
627 unsigned int quot;
628 struct clk *src;
629 };
630
631 static int s3c24xx_serial_calcbaud(struct baud_calc *calc,
632 struct uart_port *port,
633 struct s3c24xx_uart_clksrc *clksrc,
634 unsigned int baud)
635 {
636 unsigned long rate;
637
638 calc->src = clk_get(port->dev, clksrc->name);
639 if (calc->src == NULL || IS_ERR(calc->src))
640 return 0;
641
642 rate = clk_get_rate(calc->src);
643 rate /= clksrc->divisor;
644
645 calc->clksrc = clksrc;
646 calc->quot = (rate + (8 * baud)) / (16 * baud);
647 calc->calc = (rate / (calc->quot * 16));
648
649 calc->quot--;
650 return 1;
651 }
652
653 static unsigned int s3c24xx_serial_getclk(struct uart_port *port,
654 struct s3c24xx_uart_clksrc **clksrc,
655 struct clk **clk,
656 unsigned int baud)
657 {
658 struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
659 struct s3c24xx_uart_clksrc *clkp;
660 struct baud_calc res[MAX_CLKS];
661 struct baud_calc *resptr, *best, *sptr;
662 int i;
663
664 clkp = cfg->clocks;
665 best = NULL;
666
667 if (cfg->clocks_size < 2) {
668 if (cfg->clocks_size == 0)
669 clkp = &tmp_clksrc;
670
671 /* check to see if we're sourcing fclk, and if so we're
672 * going to have to update the clock source
673 */
674
675 if (strcmp(clkp->name, "fclk") == 0) {
676 struct s3c24xx_uart_clksrc src;
677
678 s3c24xx_serial_getsource(port, &src);
679
680 /* check that the port already using fclk, and if
681 * not, then re-select fclk
682 */
683
684 if (strcmp(src.name, clkp->name) == 0) {
685 s3c24xx_serial_setsource(port, clkp);
686 s3c24xx_serial_getsource(port, &src);
687 }
688
689 clkp->divisor = src.divisor;
690 }
691
692 s3c24xx_serial_calcbaud(res, port, clkp, baud);
693 best = res;
694 resptr = best + 1;
695 } else {
696 resptr = res;
697
698 for (i = 0; i < cfg->clocks_size; i++, clkp++) {
699 if (s3c24xx_serial_calcbaud(resptr, port, clkp, baud))
700 resptr++;
701 }
702 }
703
704 /* ok, we now need to select the best clock we found */
705
706 if (!best) {
707 unsigned int deviation = (1<<30)|((1<<30)-1);
708 int calc_deviation;
709
710 for (sptr = res; sptr < resptr; sptr++) {
711 printk(KERN_DEBUG
712 "found clk %p (%s) quot %d, calc %d\n",
713 sptr->clksrc, sptr->clksrc->name,
714 sptr->quot, sptr->calc);
715
716 calc_deviation = baud - sptr->calc;
717 if (calc_deviation < 0)
718 calc_deviation = -calc_deviation;
719
720 if (calc_deviation < deviation) {
721 best = sptr;
722 deviation = calc_deviation;
723 }
724 }
725
726 printk(KERN_DEBUG "best %p (deviation %d)\n", best, deviation);
727 }
728
729 printk(KERN_DEBUG "selected clock %p (%s) quot %d, calc %d\n",
730 best->clksrc, best->clksrc->name, best->quot, best->calc);
731
732 /* store results to pass back */
733
734 *clksrc = best->clksrc;
735 *clk = best->src;
736
737 return best->quot;
738 }
739
740 static void s3c24xx_serial_set_termios(struct uart_port *port,
741 struct ktermios *termios,
742 struct ktermios *old)
743 {
744 struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
745 struct s3c24xx_uart_port *ourport = to_ourport(port);
746 struct s3c24xx_uart_clksrc *clksrc = NULL;
747 struct clk *clk = NULL;
748 unsigned long flags;
749 unsigned int baud, quot;
750 unsigned int ulcon;
751 unsigned int umcon;
752
753 /*
754 * We don't support modem control lines.
755 */
756 termios->c_cflag &= ~(HUPCL | CMSPAR);
757 termios->c_cflag |= CLOCAL;
758
759 /*
760 * Ask the core to calculate the divisor for us.
761 */
762
763 baud = uart_get_baud_rate(port, termios, old, 0, 115200*8);
764
765 if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
766 quot = port->custom_divisor;
767 else
768 quot = s3c24xx_serial_getclk(port, &clksrc, &clk, baud);
769
770 /* check to see if we need to change clock source */
771
772 if (ourport->clksrc != clksrc || ourport->baudclk != clk) {
773 s3c24xx_serial_setsource(port, clksrc);
774
775 if (ourport->baudclk != NULL && !IS_ERR(ourport->baudclk)) {
776 clk_disable(ourport->baudclk);
777 ourport->baudclk = NULL;
778 }
779
780 clk_enable(clk);
781
782 ourport->clksrc = clksrc;
783 ourport->baudclk = clk;
784 }
785
786 switch (termios->c_cflag & CSIZE) {
787 case CS5:
788 dbg("config: 5bits/char\n");
789 ulcon = S3C2410_LCON_CS5;
790 break;
791 case CS6:
792 dbg("config: 6bits/char\n");
793 ulcon = S3C2410_LCON_CS6;
794 break;
795 case CS7:
796 dbg("config: 7bits/char\n");
797 ulcon = S3C2410_LCON_CS7;
798 break;
799 case CS8:
800 default:
801 dbg("config: 8bits/char\n");
802 ulcon = S3C2410_LCON_CS8;
803 break;
804 }
805
806 /* preserve original lcon IR settings */
807 ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
808
809 if (termios->c_cflag & CSTOPB)
810 ulcon |= S3C2410_LCON_STOPB;
811
812 umcon = (termios->c_cflag & CRTSCTS) ? S3C2410_UMCOM_AFC : 0;
813
814 if (termios->c_cflag & PARENB) {
815 if (termios->c_cflag & PARODD)
816 ulcon |= S3C2410_LCON_PODD;
817 else
818 ulcon |= S3C2410_LCON_PEVEN;
819 } else {
820 ulcon |= S3C2410_LCON_PNONE;
821 }
822
823 spin_lock_irqsave(&port->lock, flags);
824
825 dbg("setting ulcon to %08x, brddiv to %d\n", ulcon, quot);
826
827 wr_regl(port, S3C2410_ULCON, ulcon);
828 wr_regl(port, S3C2410_UBRDIV, quot);
829 wr_regl(port, S3C2410_UMCON, umcon);
830
831 dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
832 rd_regl(port, S3C2410_ULCON),
833 rd_regl(port, S3C2410_UCON),
834 rd_regl(port, S3C2410_UFCON));
835
836 /*
837 * Update the per-port timeout.
838 */
839 uart_update_timeout(port, termios->c_cflag, baud);
840
841 /*
842 * Which character status flags are we interested in?
843 */
844 port->read_status_mask = S3C2410_UERSTAT_OVERRUN;
845 if (termios->c_iflag & INPCK)
846 port->read_status_mask |= S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_PARITY;
847
848 /*
849 * Which character status flags should we ignore?
850 */
851 port->ignore_status_mask = 0;
852 if (termios->c_iflag & IGNPAR)
853 port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN;
854 if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
855 port->ignore_status_mask |= S3C2410_UERSTAT_FRAME;
856
857 /*
858 * Ignore all characters if CREAD is not set.
859 */
860 if ((termios->c_cflag & CREAD) == 0)
861 port->ignore_status_mask |= RXSTAT_DUMMY_READ;
862
863 spin_unlock_irqrestore(&port->lock, flags);
864 }
865
866 static const char *s3c24xx_serial_type(struct uart_port *port)
867 {
868 switch (port->type) {
869 case PORT_S3C2410:
870 return "S3C2410";
871 case PORT_S3C2440:
872 return "S3C2440";
873 case PORT_S3C2412:
874 return "S3C2412";
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 .major = S3C24XX_SERIAL_MAJOR,
954 .minor = S3C24XX_SERIAL_MINOR,
955 };
956
957 static struct s3c24xx_uart_port s3c24xx_serial_ports[NR_PORTS] = {
958 [0] = {
959 .port = {
960 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[0].port.lock),
961 .iotype = UPIO_MEM,
962 .irq = IRQ_S3CUART_RX0,
963 .uartclk = 0,
964 .fifosize = 16,
965 .ops = &s3c24xx_serial_ops,
966 .flags = UPF_BOOT_AUTOCONF,
967 .line = 0,
968 }
969 },
970 [1] = {
971 .port = {
972 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[1].port.lock),
973 .iotype = UPIO_MEM,
974 .irq = IRQ_S3CUART_RX1,
975 .uartclk = 0,
976 .fifosize = 16,
977 .ops = &s3c24xx_serial_ops,
978 .flags = UPF_BOOT_AUTOCONF,
979 .line = 1,
980 }
981 },
982 #if NR_PORTS > 2
983
984 [2] = {
985 .port = {
986 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[2].port.lock),
987 .iotype = UPIO_MEM,
988 .irq = IRQ_S3CUART_RX2,
989 .uartclk = 0,
990 .fifosize = 16,
991 .ops = &s3c24xx_serial_ops,
992 .flags = UPF_BOOT_AUTOCONF,
993 .line = 2,
994 }
995 }
996 #endif
997 };
998
999 /* s3c24xx_serial_resetport
1000 *
1001 * wrapper to call the specific reset for this port (reset the fifos
1002 * and the settings)
1003 */
1004
1005 static inline int s3c24xx_serial_resetport(struct uart_port * port,
1006 struct s3c2410_uartcfg *cfg)
1007 {
1008 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1009
1010 return (info->reset_port)(port, cfg);
1011 }
1012
1013 /* s3c24xx_serial_init_port
1014 *
1015 * initialise a single serial port from the platform device given
1016 */
1017
1018 static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
1019 struct s3c24xx_uart_info *info,
1020 struct platform_device *platdev)
1021 {
1022 struct uart_port *port = &ourport->port;
1023 struct s3c2410_uartcfg *cfg;
1024 struct resource *res;
1025 int ret;
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 ret = platform_get_irq(platdev, 0);
1069 if (ret < 0)
1070 port->irq = 0;
1071 else
1072 port->irq = ret;
1073
1074 ourport->clk = clk_get(&platdev->dev, "uart");
1075
1076 dbg("port: map=%08x, mem=%08x, irq=%d, clock=%ld\n",
1077 port->mapbase, port->membase, port->irq, port->uartclk);
1078
1079 /* reset the fifos (and setup the uart) */
1080 s3c24xx_serial_resetport(port, cfg);
1081 return 0;
1082 }
1083
1084 /* Device driver serial port probe */
1085
1086 static int probe_index = 0;
1087
1088 static int s3c24xx_serial_probe(struct platform_device *dev,
1089 struct s3c24xx_uart_info *info)
1090 {
1091 struct s3c24xx_uart_port *ourport;
1092 int ret;
1093
1094 dbg("s3c24xx_serial_probe(%p, %p) %d\n", dev, info, probe_index);
1095
1096 ourport = &s3c24xx_serial_ports[probe_index];
1097 probe_index++;
1098
1099 dbg("%s: initialising port %p...\n", __func__, ourport);
1100
1101 ret = s3c24xx_serial_init_port(ourport, info, dev);
1102 if (ret < 0)
1103 goto probe_err;
1104
1105 dbg("%s: adding port\n", __func__);
1106 uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
1107 platform_set_drvdata(dev, &ourport->port);
1108
1109 return 0;
1110
1111 probe_err:
1112 return ret;
1113 }
1114
1115 static int s3c24xx_serial_remove(struct platform_device *dev)
1116 {
1117 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1118
1119 if (port)
1120 uart_remove_one_port(&s3c24xx_uart_drv, port);
1121
1122 return 0;
1123 }
1124
1125 /* UART power management code */
1126
1127 #ifdef CONFIG_PM
1128
1129 static int s3c24xx_serial_suspend(struct platform_device *dev, pm_message_t state)
1130 {
1131 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1132
1133 if (port)
1134 uart_suspend_port(&s3c24xx_uart_drv, port);
1135
1136 return 0;
1137 }
1138
1139 static int s3c24xx_serial_resume(struct platform_device *dev)
1140 {
1141 struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
1142 struct s3c24xx_uart_port *ourport = to_ourport(port);
1143
1144 if (port) {
1145 clk_enable(ourport->clk);
1146 s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
1147 clk_disable(ourport->clk);
1148
1149 uart_resume_port(&s3c24xx_uart_drv, port);
1150 }
1151
1152 return 0;
1153 }
1154
1155 #else
1156 #define s3c24xx_serial_suspend NULL
1157 #define s3c24xx_serial_resume NULL
1158 #endif
1159
1160 static int s3c24xx_serial_init(struct platform_driver *drv,
1161 struct s3c24xx_uart_info *info)
1162 {
1163 dbg("s3c24xx_serial_init(%p,%p)\n", drv, info);
1164 return platform_driver_register(drv);
1165 }
1166
1167
1168 /* now comes the code to initialise either the s3c2410 or s3c2440 serial
1169 * port information
1170 */
1171
1172 /* cpu specific variations on the serial port support */
1173
1174 #ifdef CONFIG_CPU_S3C2400
1175
1176 static int s3c2400_serial_getsource(struct uart_port *port,
1177 struct s3c24xx_uart_clksrc *clk)
1178 {
1179 clk->divisor = 1;
1180 clk->name = "pclk";
1181
1182 return 0;
1183 }
1184
1185 static int s3c2400_serial_setsource(struct uart_port *port,
1186 struct s3c24xx_uart_clksrc *clk)
1187 {
1188 return 0;
1189 }
1190
1191 static int s3c2400_serial_resetport(struct uart_port *port,
1192 struct s3c2410_uartcfg *cfg)
1193 {
1194 dbg("s3c2400_serial_resetport: port=%p (%08lx), cfg=%p\n",
1195 port, port->mapbase, cfg);
1196
1197 wr_regl(port, S3C2410_UCON, cfg->ucon);
1198 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
1199
1200 /* reset both fifos */
1201
1202 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1203 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1204
1205 return 0;
1206 }
1207
1208 static struct s3c24xx_uart_info s3c2400_uart_inf = {
1209 .name = "Samsung S3C2400 UART",
1210 .type = PORT_S3C2400,
1211 .fifosize = 16,
1212 .rx_fifomask = S3C2410_UFSTAT_RXMASK,
1213 .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
1214 .rx_fifofull = S3C2410_UFSTAT_RXFULL,
1215 .tx_fifofull = S3C2410_UFSTAT_TXFULL,
1216 .tx_fifomask = S3C2410_UFSTAT_TXMASK,
1217 .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
1218 .get_clksrc = s3c2400_serial_getsource,
1219 .set_clksrc = s3c2400_serial_setsource,
1220 .reset_port = s3c2400_serial_resetport,
1221 };
1222
1223 static int s3c2400_serial_probe(struct platform_device *dev)
1224 {
1225 return s3c24xx_serial_probe(dev, &s3c2400_uart_inf);
1226 }
1227
1228 static struct platform_driver s3c2400_serial_drv = {
1229 .probe = s3c2400_serial_probe,
1230 .remove = s3c24xx_serial_remove,
1231 .suspend = s3c24xx_serial_suspend,
1232 .resume = s3c24xx_serial_resume,
1233 .driver = {
1234 .name = "s3c2400-uart",
1235 .owner = THIS_MODULE,
1236 },
1237 };
1238
1239 static inline int s3c2400_serial_init(void)
1240 {
1241 return s3c24xx_serial_init(&s3c2400_serial_drv, &s3c2400_uart_inf);
1242 }
1243
1244 static inline void s3c2400_serial_exit(void)
1245 {
1246 platform_driver_unregister(&s3c2400_serial_drv);
1247 }
1248
1249 #define s3c2400_uart_inf_at &s3c2400_uart_inf
1250 #else
1251
1252 static inline int s3c2400_serial_init(void)
1253 {
1254 return 0;
1255 }
1256
1257 static inline void s3c2400_serial_exit(void)
1258 {
1259 }
1260
1261 #define s3c2400_uart_inf_at NULL
1262
1263 #endif /* CONFIG_CPU_S3C2400 */
1264
1265 /* S3C2410 support */
1266
1267 #ifdef CONFIG_CPU_S3C2410
1268
1269 static int s3c2410_serial_setsource(struct uart_port *port,
1270 struct s3c24xx_uart_clksrc *clk)
1271 {
1272 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1273
1274 if (strcmp(clk->name, "uclk") == 0)
1275 ucon |= S3C2410_UCON_UCLK;
1276 else
1277 ucon &= ~S3C2410_UCON_UCLK;
1278
1279 wr_regl(port, S3C2410_UCON, ucon);
1280 return 0;
1281 }
1282
1283 static int s3c2410_serial_getsource(struct uart_port *port,
1284 struct s3c24xx_uart_clksrc *clk)
1285 {
1286 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1287
1288 clk->divisor = 1;
1289 clk->name = (ucon & S3C2410_UCON_UCLK) ? "uclk" : "pclk";
1290
1291 return 0;
1292 }
1293
1294 static int s3c2410_serial_resetport(struct uart_port *port,
1295 struct s3c2410_uartcfg *cfg)
1296 {
1297 dbg("s3c2410_serial_resetport: port=%p (%08lx), cfg=%p\n",
1298 port, port->mapbase, cfg);
1299
1300 wr_regl(port, S3C2410_UCON, cfg->ucon);
1301 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
1302
1303 /* reset both fifos */
1304
1305 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1306 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1307
1308 return 0;
1309 }
1310
1311 static struct s3c24xx_uart_info s3c2410_uart_inf = {
1312 .name = "Samsung S3C2410 UART",
1313 .type = PORT_S3C2410,
1314 .fifosize = 16,
1315 .rx_fifomask = S3C2410_UFSTAT_RXMASK,
1316 .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
1317 .rx_fifofull = S3C2410_UFSTAT_RXFULL,
1318 .tx_fifofull = S3C2410_UFSTAT_TXFULL,
1319 .tx_fifomask = S3C2410_UFSTAT_TXMASK,
1320 .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT,
1321 .get_clksrc = s3c2410_serial_getsource,
1322 .set_clksrc = s3c2410_serial_setsource,
1323 .reset_port = s3c2410_serial_resetport,
1324 };
1325
1326 /* device management */
1327
1328 static int s3c2410_serial_probe(struct platform_device *dev)
1329 {
1330 return s3c24xx_serial_probe(dev, &s3c2410_uart_inf);
1331 }
1332
1333 static struct platform_driver s3c2410_serial_drv = {
1334 .probe = s3c2410_serial_probe,
1335 .remove = s3c24xx_serial_remove,
1336 .suspend = s3c24xx_serial_suspend,
1337 .resume = s3c24xx_serial_resume,
1338 .driver = {
1339 .name = "s3c2410-uart",
1340 .owner = THIS_MODULE,
1341 },
1342 };
1343
1344 static inline int s3c2410_serial_init(void)
1345 {
1346 return s3c24xx_serial_init(&s3c2410_serial_drv, &s3c2410_uart_inf);
1347 }
1348
1349 static inline void s3c2410_serial_exit(void)
1350 {
1351 platform_driver_unregister(&s3c2410_serial_drv);
1352 }
1353
1354 #define s3c2410_uart_inf_at &s3c2410_uart_inf
1355 #else
1356
1357 static inline int s3c2410_serial_init(void)
1358 {
1359 return 0;
1360 }
1361
1362 static inline void s3c2410_serial_exit(void)
1363 {
1364 }
1365
1366 #define s3c2410_uart_inf_at NULL
1367
1368 #endif /* CONFIG_CPU_S3C2410 */
1369
1370 #if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2442)
1371
1372 static int s3c2440_serial_setsource(struct uart_port *port,
1373 struct s3c24xx_uart_clksrc *clk)
1374 {
1375 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1376
1377 // todo - proper fclk<>nonfclk switch //
1378
1379 ucon &= ~S3C2440_UCON_CLKMASK;
1380
1381 if (strcmp(clk->name, "uclk") == 0)
1382 ucon |= S3C2440_UCON_UCLK;
1383 else if (strcmp(clk->name, "pclk") == 0)
1384 ucon |= S3C2440_UCON_PCLK;
1385 else if (strcmp(clk->name, "fclk") == 0)
1386 ucon |= S3C2440_UCON_FCLK;
1387 else {
1388 printk(KERN_ERR "unknown clock source %s\n", clk->name);
1389 return -EINVAL;
1390 }
1391
1392 wr_regl(port, S3C2410_UCON, ucon);
1393 return 0;
1394 }
1395
1396
1397 static int s3c2440_serial_getsource(struct uart_port *port,
1398 struct s3c24xx_uart_clksrc *clk)
1399 {
1400 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1401 unsigned long ucon0, ucon1, ucon2;
1402
1403 switch (ucon & S3C2440_UCON_CLKMASK) {
1404 case S3C2440_UCON_UCLK:
1405 clk->divisor = 1;
1406 clk->name = "uclk";
1407 break;
1408
1409 case S3C2440_UCON_PCLK:
1410 case S3C2440_UCON_PCLK2:
1411 clk->divisor = 1;
1412 clk->name = "pclk";
1413 break;
1414
1415 case S3C2440_UCON_FCLK:
1416 /* the fun of calculating the uart divisors on
1417 * the s3c2440 */
1418
1419 ucon0 = __raw_readl(S3C24XX_VA_UART0 + S3C2410_UCON);
1420 ucon1 = __raw_readl(S3C24XX_VA_UART1 + S3C2410_UCON);
1421 ucon2 = __raw_readl(S3C24XX_VA_UART2 + S3C2410_UCON);
1422
1423 printk("ucons: %08lx, %08lx, %08lx\n", ucon0, ucon1, ucon2);
1424
1425 ucon0 &= S3C2440_UCON0_DIVMASK;
1426 ucon1 &= S3C2440_UCON1_DIVMASK;
1427 ucon2 &= S3C2440_UCON2_DIVMASK;
1428
1429 if (ucon0 != 0) {
1430 clk->divisor = ucon0 >> S3C2440_UCON_DIVSHIFT;
1431 clk->divisor += 6;
1432 } else if (ucon1 != 0) {
1433 clk->divisor = ucon1 >> S3C2440_UCON_DIVSHIFT;
1434 clk->divisor += 21;
1435 } else if (ucon2 != 0) {
1436 clk->divisor = ucon2 >> S3C2440_UCON_DIVSHIFT;
1437 clk->divisor += 36;
1438 } else {
1439 /* manual calims 44, seems to be 9 */
1440 clk->divisor = 9;
1441 }
1442
1443 clk->name = "fclk";
1444 break;
1445 }
1446
1447 return 0;
1448 }
1449
1450 static int s3c2440_serial_resetport(struct uart_port *port,
1451 struct s3c2410_uartcfg *cfg)
1452 {
1453 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1454
1455 dbg("s3c2440_serial_resetport: port=%p (%08lx), cfg=%p\n",
1456 port, port->mapbase, cfg);
1457
1458 /* ensure we don't change the clock settings... */
1459
1460 ucon &= (S3C2440_UCON0_DIVMASK | (3<<10));
1461
1462 wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
1463 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
1464
1465 /* reset both fifos */
1466
1467 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1468 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1469
1470 return 0;
1471 }
1472
1473 static struct s3c24xx_uart_info s3c2440_uart_inf = {
1474 .name = "Samsung S3C2440 UART",
1475 .type = PORT_S3C2440,
1476 .fifosize = 64,
1477 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1478 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1479 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1480 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1481 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1482 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1483 .get_clksrc = s3c2440_serial_getsource,
1484 .set_clksrc = s3c2440_serial_setsource,
1485 .reset_port = s3c2440_serial_resetport,
1486 };
1487
1488 /* device management */
1489
1490 static int s3c2440_serial_probe(struct platform_device *dev)
1491 {
1492 dbg("s3c2440_serial_probe: dev=%p\n", dev);
1493 return s3c24xx_serial_probe(dev, &s3c2440_uart_inf);
1494 }
1495
1496 static struct platform_driver s3c2440_serial_drv = {
1497 .probe = s3c2440_serial_probe,
1498 .remove = s3c24xx_serial_remove,
1499 .suspend = s3c24xx_serial_suspend,
1500 .resume = s3c24xx_serial_resume,
1501 .driver = {
1502 .name = "s3c2440-uart",
1503 .owner = THIS_MODULE,
1504 },
1505 };
1506
1507
1508 static inline int s3c2440_serial_init(void)
1509 {
1510 return s3c24xx_serial_init(&s3c2440_serial_drv, &s3c2440_uart_inf);
1511 }
1512
1513 static inline void s3c2440_serial_exit(void)
1514 {
1515 platform_driver_unregister(&s3c2440_serial_drv);
1516 }
1517
1518 #define s3c2440_uart_inf_at &s3c2440_uart_inf
1519 #else
1520
1521 static inline int s3c2440_serial_init(void)
1522 {
1523 return 0;
1524 }
1525
1526 static inline void s3c2440_serial_exit(void)
1527 {
1528 }
1529
1530 #define s3c2440_uart_inf_at NULL
1531 #endif /* CONFIG_CPU_S3C2440 */
1532
1533 #if defined(CONFIG_CPU_S3C2412)
1534
1535 static int s3c2412_serial_setsource(struct uart_port *port,
1536 struct s3c24xx_uart_clksrc *clk)
1537 {
1538 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1539
1540 ucon &= ~S3C2412_UCON_CLKMASK;
1541
1542 if (strcmp(clk->name, "uclk") == 0)
1543 ucon |= S3C2440_UCON_UCLK;
1544 else if (strcmp(clk->name, "pclk") == 0)
1545 ucon |= S3C2440_UCON_PCLK;
1546 else if (strcmp(clk->name, "usysclk") == 0)
1547 ucon |= S3C2412_UCON_USYSCLK;
1548 else {
1549 printk(KERN_ERR "unknown clock source %s\n", clk->name);
1550 return -EINVAL;
1551 }
1552
1553 wr_regl(port, S3C2410_UCON, ucon);
1554 return 0;
1555 }
1556
1557
1558 static int s3c2412_serial_getsource(struct uart_port *port,
1559 struct s3c24xx_uart_clksrc *clk)
1560 {
1561 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1562
1563 switch (ucon & S3C2412_UCON_CLKMASK) {
1564 case S3C2412_UCON_UCLK:
1565 clk->divisor = 1;
1566 clk->name = "uclk";
1567 break;
1568
1569 case S3C2412_UCON_PCLK:
1570 case S3C2412_UCON_PCLK2:
1571 clk->divisor = 1;
1572 clk->name = "pclk";
1573 break;
1574
1575 case S3C2412_UCON_USYSCLK:
1576 clk->divisor = 1;
1577 clk->name = "usysclk";
1578 break;
1579 }
1580
1581 return 0;
1582 }
1583
1584 static int s3c2412_serial_resetport(struct uart_port *port,
1585 struct s3c2410_uartcfg *cfg)
1586 {
1587 unsigned long ucon = rd_regl(port, S3C2410_UCON);
1588
1589 dbg("%s: port=%p (%08lx), cfg=%p\n",
1590 __func__, port, port->mapbase, cfg);
1591
1592 /* ensure we don't change the clock settings... */
1593
1594 ucon &= S3C2412_UCON_CLKMASK;
1595
1596 wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
1597 wr_regl(port, S3C2410_ULCON, cfg->ulcon);
1598
1599 /* reset both fifos */
1600
1601 wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
1602 wr_regl(port, S3C2410_UFCON, cfg->ufcon);
1603
1604 return 0;
1605 }
1606
1607 static struct s3c24xx_uart_info s3c2412_uart_inf = {
1608 .name = "Samsung S3C2412 UART",
1609 .type = PORT_S3C2412,
1610 .fifosize = 64,
1611 .rx_fifomask = S3C2440_UFSTAT_RXMASK,
1612 .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT,
1613 .rx_fifofull = S3C2440_UFSTAT_RXFULL,
1614 .tx_fifofull = S3C2440_UFSTAT_TXFULL,
1615 .tx_fifomask = S3C2440_UFSTAT_TXMASK,
1616 .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT,
1617 .get_clksrc = s3c2412_serial_getsource,
1618 .set_clksrc = s3c2412_serial_setsource,
1619 .reset_port = s3c2412_serial_resetport,
1620 };
1621
1622 /* device management */
1623
1624 static int s3c2412_serial_probe(struct platform_device *dev)
1625 {
1626 dbg("s3c2440_serial_probe: dev=%p\n", dev);
1627 return s3c24xx_serial_probe(dev, &s3c2412_uart_inf);
1628 }
1629
1630 static struct platform_driver s3c2412_serial_drv = {
1631 .probe = s3c2412_serial_probe,
1632 .remove = s3c24xx_serial_remove,
1633 .suspend = s3c24xx_serial_suspend,
1634 .resume = s3c24xx_serial_resume,
1635 .driver = {
1636 .name = "s3c2412-uart",
1637 .owner = THIS_MODULE,
1638 },
1639 };
1640
1641
1642 static inline int s3c2412_serial_init(void)
1643 {
1644 return s3c24xx_serial_init(&s3c2412_serial_drv, &s3c2412_uart_inf);
1645 }
1646
1647 static inline void s3c2412_serial_exit(void)
1648 {
1649 platform_driver_unregister(&s3c2412_serial_drv);
1650 }
1651
1652 #define s3c2412_uart_inf_at &s3c2412_uart_inf
1653 #else
1654
1655 static inline int s3c2412_serial_init(void)
1656 {
1657 return 0;
1658 }
1659
1660 static inline void s3c2412_serial_exit(void)
1661 {
1662 }
1663
1664 #define s3c2412_uart_inf_at NULL
1665 #endif /* CONFIG_CPU_S3C2440 */
1666
1667
1668 /* module initialisation code */
1669
1670 static int __init s3c24xx_serial_modinit(void)
1671 {
1672 int ret;
1673
1674 ret = uart_register_driver(&s3c24xx_uart_drv);
1675 if (ret < 0) {
1676 printk(KERN_ERR "failed to register UART driver\n");
1677 return -1;
1678 }
1679
1680 s3c2400_serial_init();
1681 s3c2410_serial_init();
1682 s3c2412_serial_init();
1683 s3c2440_serial_init();
1684
1685 return 0;
1686 }
1687
1688 static void __exit s3c24xx_serial_modexit(void)
1689 {
1690 s3c2400_serial_exit();
1691 s3c2410_serial_exit();
1692 s3c2412_serial_exit();
1693 s3c2440_serial_exit();
1694
1695 uart_unregister_driver(&s3c24xx_uart_drv);
1696 }
1697
1698
1699 module_init(s3c24xx_serial_modinit);
1700 module_exit(s3c24xx_serial_modexit);
1701
1702 /* Console code */
1703
1704 #ifdef CONFIG_SERIAL_S3C2410_CONSOLE
1705
1706 static struct uart_port *cons_uart;
1707
1708 static int
1709 s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
1710 {
1711 struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
1712 unsigned long ufstat, utrstat;
1713
1714 if (ufcon & S3C2410_UFCON_FIFOMODE) {
1715 /* fifo mode - check ammount of data in fifo registers... */
1716
1717 ufstat = rd_regl(port, S3C2410_UFSTAT);
1718 return (ufstat & info->tx_fifofull) ? 0 : 1;
1719 }
1720
1721 /* in non-fifo mode, we go and use the tx buffer empty */
1722
1723 utrstat = rd_regl(port, S3C2410_UTRSTAT);
1724 return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
1725 }
1726
1727 static void
1728 s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
1729 {
1730 unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON);
1731 while (!s3c24xx_serial_console_txrdy(port, ufcon))
1732 barrier();
1733 wr_regb(cons_uart, S3C2410_UTXH, ch);
1734 }
1735
1736 static void
1737 s3c24xx_serial_console_write(struct console *co, const char *s,
1738 unsigned int count)
1739 {
1740 uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
1741 }
1742
1743 static void __init
1744 s3c24xx_serial_get_options(struct uart_port *port, int *baud,
1745 int *parity, int *bits)
1746 {
1747 struct s3c24xx_uart_clksrc clksrc;
1748 struct clk *clk;
1749 unsigned int ulcon;
1750 unsigned int ucon;
1751 unsigned int ubrdiv;
1752 unsigned long rate;
1753
1754 ulcon = rd_regl(port, S3C2410_ULCON);
1755 ucon = rd_regl(port, S3C2410_UCON);
1756 ubrdiv = rd_regl(port, S3C2410_UBRDIV);
1757
1758 dbg("s3c24xx_serial_get_options: port=%p\n"
1759 "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
1760 port, ulcon, ucon, ubrdiv);
1761
1762 if ((ucon & 0xf) != 0) {
1763 /* consider the serial port configured if the tx/rx mode set */
1764
1765 switch (ulcon & S3C2410_LCON_CSMASK) {
1766 case S3C2410_LCON_CS5:
1767 *bits = 5;
1768 break;
1769 case S3C2410_LCON_CS6:
1770 *bits = 6;
1771 break;
1772 case S3C2410_LCON_CS7:
1773 *bits = 7;
1774 break;
1775 default:
1776 case S3C2410_LCON_CS8:
1777 *bits = 8;
1778 break;
1779 }
1780
1781 switch (ulcon & S3C2410_LCON_PMASK) {
1782 case S3C2410_LCON_PEVEN:
1783 *parity = 'e';
1784 break;
1785
1786 case S3C2410_LCON_PODD:
1787 *parity = 'o';
1788 break;
1789
1790 case S3C2410_LCON_PNONE:
1791 default:
1792 *parity = 'n';
1793 }
1794
1795 /* now calculate the baud rate */
1796
1797 s3c24xx_serial_getsource(port, &clksrc);
1798
1799 clk = clk_get(port->dev, clksrc.name);
1800 if (!IS_ERR(clk) && clk != NULL)
1801 rate = clk_get_rate(clk) / clksrc.divisor;
1802 else
1803 rate = 1;
1804
1805
1806 *baud = rate / ( 16 * (ubrdiv + 1));
1807 dbg("calculated baud %d\n", *baud);
1808 }
1809
1810 }
1811
1812 /* s3c24xx_serial_init_ports
1813 *
1814 * initialise the serial ports from the machine provided initialisation
1815 * data.
1816 */
1817
1818 static int s3c24xx_serial_init_ports(struct s3c24xx_uart_info *info)
1819 {
1820 struct s3c24xx_uart_port *ptr = s3c24xx_serial_ports;
1821 struct platform_device **platdev_ptr;
1822 int i;
1823
1824 dbg("s3c24xx_serial_init_ports: initialising ports...\n");
1825
1826 platdev_ptr = s3c24xx_uart_devs;
1827
1828 for (i = 0; i < NR_PORTS; i++, ptr++, platdev_ptr++) {
1829 s3c24xx_serial_init_port(ptr, info, *platdev_ptr);
1830 }
1831
1832 return 0;
1833 }
1834
1835 static int __init
1836 s3c24xx_serial_console_setup(struct console *co, char *options)
1837 {
1838 struct uart_port *port;
1839 int baud = 9600;
1840 int bits = 8;
1841 int parity = 'n';
1842 int flow = 'n';
1843
1844 dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n",
1845 co, co->index, options);
1846
1847 /* is this a valid port */
1848
1849 if (co->index == -1 || co->index >= NR_PORTS)
1850 co->index = 0;
1851
1852 port = &s3c24xx_serial_ports[co->index].port;
1853
1854 /* is the port configured? */
1855
1856 if (port->mapbase == 0x0) {
1857 co->index = 0;
1858 port = &s3c24xx_serial_ports[co->index].port;
1859 }
1860
1861 cons_uart = port;
1862
1863 dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index);
1864
1865 /*
1866 * Check whether an invalid uart number has been specified, and
1867 * if so, search for the first available port that does have
1868 * console support.
1869 */
1870 if (options)
1871 uart_parse_options(options, &baud, &parity, &bits, &flow);
1872 else
1873 s3c24xx_serial_get_options(port, &baud, &parity, &bits);
1874
1875 dbg("s3c24xx_serial_console_setup: baud %d\n", baud);
1876
1877 return uart_set_options(port, co, baud, parity, bits, flow);
1878 }
1879
1880 /* s3c24xx_serial_initconsole
1881 *
1882 * initialise the console from one of the uart drivers
1883 */
1884
1885 static struct console s3c24xx_serial_console =
1886 {
1887 .name = S3C24XX_SERIAL_NAME,
1888 .device = uart_console_device,
1889 .flags = CON_PRINTBUFFER,
1890 .index = -1,
1891 .write = s3c24xx_serial_console_write,
1892 .setup = s3c24xx_serial_console_setup
1893 };
1894
1895 static int s3c24xx_serial_initconsole(void)
1896 {
1897 struct s3c24xx_uart_info *info;
1898 struct platform_device *dev = s3c24xx_uart_devs[0];
1899
1900 dbg("s3c24xx_serial_initconsole\n");
1901
1902 /* select driver based on the cpu */
1903
1904 if (dev == NULL) {
1905 printk(KERN_ERR "s3c24xx: no devices for console init\n");
1906 return 0;
1907 }
1908
1909 if (strcmp(dev->name, "s3c2400-uart") == 0) {
1910 info = s3c2400_uart_inf_at;
1911 } else if (strcmp(dev->name, "s3c2410-uart") == 0) {
1912 info = s3c2410_uart_inf_at;
1913 } else if (strcmp(dev->name, "s3c2440-uart") == 0) {
1914 info = s3c2440_uart_inf_at;
1915 } else if (strcmp(dev->name, "s3c2412-uart") == 0) {
1916 info = s3c2412_uart_inf_at;
1917 } else {
1918 printk(KERN_ERR "s3c24xx: no driver for %s\n", dev->name);
1919 return 0;
1920 }
1921
1922 if (info == NULL) {
1923 printk(KERN_ERR "s3c24xx: no driver for console\n");
1924 return 0;
1925 }
1926
1927 s3c24xx_serial_console.data = &s3c24xx_uart_drv;
1928 s3c24xx_serial_init_ports(info);
1929
1930 register_console(&s3c24xx_serial_console);
1931 return 0;
1932 }
1933
1934 console_initcall(s3c24xx_serial_initconsole);
1935
1936 #endif /* CONFIG_SERIAL_S3C2410_CONSOLE */
1937
1938 MODULE_LICENSE("GPL");
1939 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
1940 MODULE_DESCRIPTION("Samsung S3C2410/S3C2440/S3C2412 Serial port driver");
1941 MODULE_ALIAS("platform:s3c2400-uart");
1942 MODULE_ALIAS("platform:s3c2410-uart");
1943 MODULE_ALIAS("platform:s3c2412-uart");
1944 MODULE_ALIAS("platform:s3c2440-uart");
Support for the Chinese Samsung S3C2440 based development boards