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b497549a BD |
1 | /* linux/drivers/serial/samsuing.c |
2 | * | |
3 | * Driver core for Samsung SoC onboard UARTs. | |
4 | * | |
5 | * Ben Dooks, Copyright (c) 2003-2005,2008 Simtec Electronics | |
6 | * http://armlinux.simtec.co.uk/ | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | /* Hote on 2410 error handling | |
14 | * | |
15 | * The s3c2410 manual has a love/hate affair with the contents of the | |
16 | * UERSTAT register in the UART blocks, and keeps marking some of the | |
17 | * error bits as reserved. Having checked with the s3c2410x01, | |
18 | * it copes with BREAKs properly, so I am happy to ignore the RESERVED | |
19 | * feature from the latter versions of the manual. | |
20 | * | |
21 | * If it becomes aparrent that latter versions of the 2410 remove these | |
22 | * bits, then action will have to be taken to differentiate the versions | |
23 | * and change the policy on BREAK | |
24 | * | |
25 | * BJD, 04-Nov-2004 | |
26 | */ | |
27 | ||
28 | #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
29 | #define SUPPORT_SYSRQ | |
30 | #endif | |
31 | ||
32 | #include <linux/module.h> | |
33 | #include <linux/ioport.h> | |
34 | #include <linux/io.h> | |
35 | #include <linux/platform_device.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/sysrq.h> | |
38 | #include <linux/console.h> | |
39 | #include <linux/tty.h> | |
40 | #include <linux/tty_flip.h> | |
41 | #include <linux/serial_core.h> | |
42 | #include <linux/serial.h> | |
43 | #include <linux/delay.h> | |
44 | #include <linux/clk.h> | |
45 | ||
46 | #include <asm/irq.h> | |
47 | ||
a09e64fb | 48 | #include <mach/hardware.h> |
b497549a | 49 | |
a2b7ba9c | 50 | #include <plat/regs-serial.h> |
a09e64fb | 51 | #include <mach/regs-gpio.h> |
b497549a BD |
52 | |
53 | #include "samsung.h" | |
54 | ||
55 | /* UART name and device definitions */ | |
56 | ||
57 | #define S3C24XX_SERIAL_NAME "ttySAC" | |
58 | #define S3C24XX_SERIAL_MAJOR 204 | |
59 | #define S3C24XX_SERIAL_MINOR 64 | |
60 | ||
61 | /* we can support 3 uarts, but not always use them */ | |
62 | ||
63 | #ifdef CONFIG_CPU_S3C2400 | |
64 | #define NR_PORTS (2) | |
65 | #else | |
66 | #define NR_PORTS (3) | |
67 | #endif | |
68 | ||
69 | /* port irq numbers */ | |
70 | ||
71 | #define TX_IRQ(port) ((port)->irq + 1) | |
72 | #define RX_IRQ(port) ((port)->irq) | |
73 | ||
74 | /* macros to change one thing to another */ | |
75 | ||
76 | #define tx_enabled(port) ((port)->unused[0]) | |
77 | #define rx_enabled(port) ((port)->unused[1]) | |
78 | ||
79 | /* flag to ignore all characters comming in */ | |
80 | #define RXSTAT_DUMMY_READ (0x10000000) | |
81 | ||
82 | static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port) | |
83 | { | |
84 | return container_of(port, struct s3c24xx_uart_port, port); | |
85 | } | |
86 | ||
87 | /* translate a port to the device name */ | |
88 | ||
89 | static inline const char *s3c24xx_serial_portname(struct uart_port *port) | |
90 | { | |
91 | return to_platform_device(port->dev)->name; | |
92 | } | |
93 | ||
94 | static int s3c24xx_serial_txempty_nofifo(struct uart_port *port) | |
95 | { | |
96 | return (rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE); | |
97 | } | |
98 | ||
99 | static void s3c24xx_serial_rx_enable(struct uart_port *port) | |
100 | { | |
101 | unsigned long flags; | |
102 | unsigned int ucon, ufcon; | |
103 | int count = 10000; | |
104 | ||
105 | spin_lock_irqsave(&port->lock, flags); | |
106 | ||
107 | while (--count && !s3c24xx_serial_txempty_nofifo(port)) | |
108 | udelay(100); | |
109 | ||
110 | ufcon = rd_regl(port, S3C2410_UFCON); | |
111 | ufcon |= S3C2410_UFCON_RESETRX; | |
112 | wr_regl(port, S3C2410_UFCON, ufcon); | |
113 | ||
114 | ucon = rd_regl(port, S3C2410_UCON); | |
115 | ucon |= S3C2410_UCON_RXIRQMODE; | |
116 | wr_regl(port, S3C2410_UCON, ucon); | |
117 | ||
118 | rx_enabled(port) = 1; | |
119 | spin_unlock_irqrestore(&port->lock, flags); | |
120 | } | |
121 | ||
122 | static void s3c24xx_serial_rx_disable(struct uart_port *port) | |
123 | { | |
124 | unsigned long flags; | |
125 | unsigned int ucon; | |
126 | ||
127 | spin_lock_irqsave(&port->lock, flags); | |
128 | ||
129 | ucon = rd_regl(port, S3C2410_UCON); | |
130 | ucon &= ~S3C2410_UCON_RXIRQMODE; | |
131 | wr_regl(port, S3C2410_UCON, ucon); | |
132 | ||
133 | rx_enabled(port) = 0; | |
134 | spin_unlock_irqrestore(&port->lock, flags); | |
135 | } | |
136 | ||
137 | static void s3c24xx_serial_stop_tx(struct uart_port *port) | |
138 | { | |
139 | if (tx_enabled(port)) { | |
140 | disable_irq(TX_IRQ(port)); | |
141 | tx_enabled(port) = 0; | |
142 | if (port->flags & UPF_CONS_FLOW) | |
143 | s3c24xx_serial_rx_enable(port); | |
144 | } | |
145 | } | |
146 | ||
147 | static void s3c24xx_serial_start_tx(struct uart_port *port) | |
148 | { | |
149 | if (!tx_enabled(port)) { | |
150 | if (port->flags & UPF_CONS_FLOW) | |
151 | s3c24xx_serial_rx_disable(port); | |
152 | ||
153 | enable_irq(TX_IRQ(port)); | |
154 | tx_enabled(port) = 1; | |
155 | } | |
156 | } | |
157 | ||
158 | ||
159 | static void s3c24xx_serial_stop_rx(struct uart_port *port) | |
160 | { | |
161 | if (rx_enabled(port)) { | |
162 | dbg("s3c24xx_serial_stop_rx: port=%p\n", port); | |
163 | disable_irq(RX_IRQ(port)); | |
164 | rx_enabled(port) = 0; | |
165 | } | |
166 | } | |
167 | ||
168 | static void s3c24xx_serial_enable_ms(struct uart_port *port) | |
169 | { | |
170 | } | |
171 | ||
172 | static inline struct s3c24xx_uart_info *s3c24xx_port_to_info(struct uart_port *port) | |
173 | { | |
174 | return to_ourport(port)->info; | |
175 | } | |
176 | ||
177 | static inline struct s3c2410_uartcfg *s3c24xx_port_to_cfg(struct uart_port *port) | |
178 | { | |
179 | if (port->dev == NULL) | |
180 | return NULL; | |
181 | ||
182 | return (struct s3c2410_uartcfg *)port->dev->platform_data; | |
183 | } | |
184 | ||
185 | static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport, | |
186 | unsigned long ufstat) | |
187 | { | |
188 | struct s3c24xx_uart_info *info = ourport->info; | |
189 | ||
190 | if (ufstat & info->rx_fifofull) | |
191 | return info->fifosize; | |
192 | ||
193 | return (ufstat & info->rx_fifomask) >> info->rx_fifoshift; | |
194 | } | |
195 | ||
196 | ||
197 | /* ? - where has parity gone?? */ | |
198 | #define S3C2410_UERSTAT_PARITY (0x1000) | |
199 | ||
200 | static irqreturn_t | |
201 | s3c24xx_serial_rx_chars(int irq, void *dev_id) | |
202 | { | |
203 | struct s3c24xx_uart_port *ourport = dev_id; | |
204 | struct uart_port *port = &ourport->port; | |
f10140fb | 205 | struct tty_struct *tty = port->info->port.tty; |
b497549a BD |
206 | unsigned int ufcon, ch, flag, ufstat, uerstat; |
207 | int max_count = 64; | |
208 | ||
209 | while (max_count-- > 0) { | |
210 | ufcon = rd_regl(port, S3C2410_UFCON); | |
211 | ufstat = rd_regl(port, S3C2410_UFSTAT); | |
212 | ||
213 | if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0) | |
214 | break; | |
215 | ||
216 | uerstat = rd_regl(port, S3C2410_UERSTAT); | |
217 | ch = rd_regb(port, S3C2410_URXH); | |
218 | ||
219 | if (port->flags & UPF_CONS_FLOW) { | |
220 | int txe = s3c24xx_serial_txempty_nofifo(port); | |
221 | ||
222 | if (rx_enabled(port)) { | |
223 | if (!txe) { | |
224 | rx_enabled(port) = 0; | |
225 | continue; | |
226 | } | |
227 | } else { | |
228 | if (txe) { | |
229 | ufcon |= S3C2410_UFCON_RESETRX; | |
230 | wr_regl(port, S3C2410_UFCON, ufcon); | |
231 | rx_enabled(port) = 1; | |
232 | goto out; | |
233 | } | |
234 | continue; | |
235 | } | |
236 | } | |
237 | ||
238 | /* insert the character into the buffer */ | |
239 | ||
240 | flag = TTY_NORMAL; | |
241 | port->icount.rx++; | |
242 | ||
243 | if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) { | |
244 | dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n", | |
245 | ch, uerstat); | |
246 | ||
247 | /* check for break */ | |
248 | if (uerstat & S3C2410_UERSTAT_BREAK) { | |
249 | dbg("break!\n"); | |
250 | port->icount.brk++; | |
251 | if (uart_handle_break(port)) | |
252 | goto ignore_char; | |
253 | } | |
254 | ||
255 | if (uerstat & S3C2410_UERSTAT_FRAME) | |
256 | port->icount.frame++; | |
257 | if (uerstat & S3C2410_UERSTAT_OVERRUN) | |
258 | port->icount.overrun++; | |
259 | ||
260 | uerstat &= port->read_status_mask; | |
261 | ||
262 | if (uerstat & S3C2410_UERSTAT_BREAK) | |
263 | flag = TTY_BREAK; | |
264 | else if (uerstat & S3C2410_UERSTAT_PARITY) | |
265 | flag = TTY_PARITY; | |
266 | else if (uerstat & (S3C2410_UERSTAT_FRAME | | |
267 | S3C2410_UERSTAT_OVERRUN)) | |
268 | flag = TTY_FRAME; | |
269 | } | |
270 | ||
271 | if (uart_handle_sysrq_char(port, ch)) | |
272 | goto ignore_char; | |
273 | ||
274 | uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN, | |
275 | ch, flag); | |
276 | ||
277 | ignore_char: | |
278 | continue; | |
279 | } | |
280 | tty_flip_buffer_push(tty); | |
281 | ||
282 | out: | |
283 | return IRQ_HANDLED; | |
284 | } | |
285 | ||
286 | static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id) | |
287 | { | |
288 | struct s3c24xx_uart_port *ourport = id; | |
289 | struct uart_port *port = &ourport->port; | |
290 | struct circ_buf *xmit = &port->info->xmit; | |
291 | int count = 256; | |
292 | ||
293 | if (port->x_char) { | |
294 | wr_regb(port, S3C2410_UTXH, port->x_char); | |
295 | port->icount.tx++; | |
296 | port->x_char = 0; | |
297 | goto out; | |
298 | } | |
299 | ||
300 | /* if there isnt anything more to transmit, or the uart is now | |
301 | * stopped, disable the uart and exit | |
302 | */ | |
303 | ||
304 | if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { | |
305 | s3c24xx_serial_stop_tx(port); | |
306 | goto out; | |
307 | } | |
308 | ||
309 | /* try and drain the buffer... */ | |
310 | ||
311 | while (!uart_circ_empty(xmit) && count-- > 0) { | |
312 | if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull) | |
313 | break; | |
314 | ||
315 | wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]); | |
316 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
317 | port->icount.tx++; | |
318 | } | |
319 | ||
320 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
321 | uart_write_wakeup(port); | |
322 | ||
323 | if (uart_circ_empty(xmit)) | |
324 | s3c24xx_serial_stop_tx(port); | |
325 | ||
326 | out: | |
327 | return IRQ_HANDLED; | |
328 | } | |
329 | ||
330 | static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port) | |
331 | { | |
332 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
333 | unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT); | |
334 | unsigned long ufcon = rd_regl(port, S3C2410_UFCON); | |
335 | ||
336 | if (ufcon & S3C2410_UFCON_FIFOMODE) { | |
337 | if ((ufstat & info->tx_fifomask) != 0 || | |
338 | (ufstat & info->tx_fifofull)) | |
339 | return 0; | |
340 | ||
341 | return 1; | |
342 | } | |
343 | ||
344 | return s3c24xx_serial_txempty_nofifo(port); | |
345 | } | |
346 | ||
347 | /* no modem control lines */ | |
348 | static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port) | |
349 | { | |
350 | unsigned int umstat = rd_regb(port, S3C2410_UMSTAT); | |
351 | ||
352 | if (umstat & S3C2410_UMSTAT_CTS) | |
353 | return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; | |
354 | else | |
355 | return TIOCM_CAR | TIOCM_DSR; | |
356 | } | |
357 | ||
358 | static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
359 | { | |
360 | /* todo - possibly remove AFC and do manual CTS */ | |
361 | } | |
362 | ||
363 | static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state) | |
364 | { | |
365 | unsigned long flags; | |
366 | unsigned int ucon; | |
367 | ||
368 | spin_lock_irqsave(&port->lock, flags); | |
369 | ||
370 | ucon = rd_regl(port, S3C2410_UCON); | |
371 | ||
372 | if (break_state) | |
373 | ucon |= S3C2410_UCON_SBREAK; | |
374 | else | |
375 | ucon &= ~S3C2410_UCON_SBREAK; | |
376 | ||
377 | wr_regl(port, S3C2410_UCON, ucon); | |
378 | ||
379 | spin_unlock_irqrestore(&port->lock, flags); | |
380 | } | |
381 | ||
382 | static void s3c24xx_serial_shutdown(struct uart_port *port) | |
383 | { | |
384 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
385 | ||
386 | if (ourport->tx_claimed) { | |
387 | free_irq(TX_IRQ(port), ourport); | |
388 | tx_enabled(port) = 0; | |
389 | ourport->tx_claimed = 0; | |
390 | } | |
391 | ||
392 | if (ourport->rx_claimed) { | |
393 | free_irq(RX_IRQ(port), ourport); | |
394 | ourport->rx_claimed = 0; | |
395 | rx_enabled(port) = 0; | |
396 | } | |
397 | } | |
398 | ||
399 | ||
400 | static int s3c24xx_serial_startup(struct uart_port *port) | |
401 | { | |
402 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
403 | int ret; | |
404 | ||
405 | dbg("s3c24xx_serial_startup: port=%p (%08lx,%p)\n", | |
406 | port->mapbase, port->membase); | |
407 | ||
408 | rx_enabled(port) = 1; | |
409 | ||
410 | ret = request_irq(RX_IRQ(port), | |
411 | s3c24xx_serial_rx_chars, 0, | |
412 | s3c24xx_serial_portname(port), ourport); | |
413 | ||
414 | if (ret != 0) { | |
415 | printk(KERN_ERR "cannot get irq %d\n", RX_IRQ(port)); | |
416 | return ret; | |
417 | } | |
418 | ||
419 | ourport->rx_claimed = 1; | |
420 | ||
421 | dbg("requesting tx irq...\n"); | |
422 | ||
423 | tx_enabled(port) = 1; | |
424 | ||
425 | ret = request_irq(TX_IRQ(port), | |
426 | s3c24xx_serial_tx_chars, 0, | |
427 | s3c24xx_serial_portname(port), ourport); | |
428 | ||
429 | if (ret) { | |
430 | printk(KERN_ERR "cannot get irq %d\n", TX_IRQ(port)); | |
431 | goto err; | |
432 | } | |
433 | ||
434 | ourport->tx_claimed = 1; | |
435 | ||
436 | dbg("s3c24xx_serial_startup ok\n"); | |
437 | ||
438 | /* the port reset code should have done the correct | |
439 | * register setup for the port controls */ | |
440 | ||
441 | return ret; | |
442 | ||
443 | err: | |
444 | s3c24xx_serial_shutdown(port); | |
445 | return ret; | |
446 | } | |
447 | ||
448 | /* power power management control */ | |
449 | ||
450 | static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level, | |
451 | unsigned int old) | |
452 | { | |
453 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
454 | ||
455 | switch (level) { | |
456 | case 3: | |
457 | if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL) | |
458 | clk_disable(ourport->baudclk); | |
459 | ||
460 | clk_disable(ourport->clk); | |
461 | break; | |
462 | ||
463 | case 0: | |
464 | clk_enable(ourport->clk); | |
465 | ||
466 | if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL) | |
467 | clk_enable(ourport->baudclk); | |
468 | ||
469 | break; | |
470 | default: | |
471 | printk(KERN_ERR "s3c24xx_serial: unknown pm %d\n", level); | |
472 | } | |
473 | } | |
474 | ||
475 | /* baud rate calculation | |
476 | * | |
477 | * The UARTs on the S3C2410/S3C2440 can take their clocks from a number | |
478 | * of different sources, including the peripheral clock ("pclk") and an | |
479 | * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk") | |
480 | * with a programmable extra divisor. | |
481 | * | |
482 | * The following code goes through the clock sources, and calculates the | |
483 | * baud clocks (and the resultant actual baud rates) and then tries to | |
484 | * pick the closest one and select that. | |
485 | * | |
486 | */ | |
487 | ||
488 | ||
489 | #define MAX_CLKS (8) | |
490 | ||
491 | static struct s3c24xx_uart_clksrc tmp_clksrc = { | |
492 | .name = "pclk", | |
493 | .min_baud = 0, | |
494 | .max_baud = 0, | |
495 | .divisor = 1, | |
496 | }; | |
497 | ||
498 | static inline int | |
499 | s3c24xx_serial_getsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c) | |
500 | { | |
501 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
502 | ||
503 | return (info->get_clksrc)(port, c); | |
504 | } | |
505 | ||
506 | static inline int | |
507 | s3c24xx_serial_setsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c) | |
508 | { | |
509 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
510 | ||
511 | return (info->set_clksrc)(port, c); | |
512 | } | |
513 | ||
514 | struct baud_calc { | |
515 | struct s3c24xx_uart_clksrc *clksrc; | |
516 | unsigned int calc; | |
517 | unsigned int quot; | |
518 | struct clk *src; | |
519 | }; | |
520 | ||
521 | static int s3c24xx_serial_calcbaud(struct baud_calc *calc, | |
522 | struct uart_port *port, | |
523 | struct s3c24xx_uart_clksrc *clksrc, | |
524 | unsigned int baud) | |
525 | { | |
526 | unsigned long rate; | |
527 | ||
528 | calc->src = clk_get(port->dev, clksrc->name); | |
529 | if (calc->src == NULL || IS_ERR(calc->src)) | |
530 | return 0; | |
531 | ||
532 | rate = clk_get_rate(calc->src); | |
533 | rate /= clksrc->divisor; | |
534 | ||
535 | calc->clksrc = clksrc; | |
536 | calc->quot = (rate + (8 * baud)) / (16 * baud); | |
537 | calc->calc = (rate / (calc->quot * 16)); | |
538 | ||
539 | calc->quot--; | |
540 | return 1; | |
541 | } | |
542 | ||
543 | static unsigned int s3c24xx_serial_getclk(struct uart_port *port, | |
544 | struct s3c24xx_uart_clksrc **clksrc, | |
545 | struct clk **clk, | |
546 | unsigned int baud) | |
547 | { | |
548 | struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port); | |
549 | struct s3c24xx_uart_clksrc *clkp; | |
550 | struct baud_calc res[MAX_CLKS]; | |
551 | struct baud_calc *resptr, *best, *sptr; | |
552 | int i; | |
553 | ||
554 | clkp = cfg->clocks; | |
555 | best = NULL; | |
556 | ||
557 | if (cfg->clocks_size < 2) { | |
558 | if (cfg->clocks_size == 0) | |
559 | clkp = &tmp_clksrc; | |
560 | ||
561 | /* check to see if we're sourcing fclk, and if so we're | |
562 | * going to have to update the clock source | |
563 | */ | |
564 | ||
565 | if (strcmp(clkp->name, "fclk") == 0) { | |
566 | struct s3c24xx_uart_clksrc src; | |
567 | ||
568 | s3c24xx_serial_getsource(port, &src); | |
569 | ||
570 | /* check that the port already using fclk, and if | |
571 | * not, then re-select fclk | |
572 | */ | |
573 | ||
574 | if (strcmp(src.name, clkp->name) == 0) { | |
575 | s3c24xx_serial_setsource(port, clkp); | |
576 | s3c24xx_serial_getsource(port, &src); | |
577 | } | |
578 | ||
579 | clkp->divisor = src.divisor; | |
580 | } | |
581 | ||
582 | s3c24xx_serial_calcbaud(res, port, clkp, baud); | |
583 | best = res; | |
584 | resptr = best + 1; | |
585 | } else { | |
586 | resptr = res; | |
587 | ||
588 | for (i = 0; i < cfg->clocks_size; i++, clkp++) { | |
589 | if (s3c24xx_serial_calcbaud(resptr, port, clkp, baud)) | |
590 | resptr++; | |
591 | } | |
592 | } | |
593 | ||
594 | /* ok, we now need to select the best clock we found */ | |
595 | ||
596 | if (!best) { | |
597 | unsigned int deviation = (1<<30)|((1<<30)-1); | |
598 | int calc_deviation; | |
599 | ||
600 | for (sptr = res; sptr < resptr; sptr++) { | |
601 | calc_deviation = baud - sptr->calc; | |
602 | if (calc_deviation < 0) | |
603 | calc_deviation = -calc_deviation; | |
604 | ||
605 | if (calc_deviation < deviation) { | |
606 | best = sptr; | |
607 | deviation = calc_deviation; | |
608 | } | |
609 | } | |
610 | } | |
611 | ||
612 | /* store results to pass back */ | |
613 | ||
614 | *clksrc = best->clksrc; | |
615 | *clk = best->src; | |
616 | ||
617 | return best->quot; | |
618 | } | |
619 | ||
620 | static void s3c24xx_serial_set_termios(struct uart_port *port, | |
621 | struct ktermios *termios, | |
622 | struct ktermios *old) | |
623 | { | |
624 | struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port); | |
625 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
626 | struct s3c24xx_uart_clksrc *clksrc = NULL; | |
627 | struct clk *clk = NULL; | |
628 | unsigned long flags; | |
629 | unsigned int baud, quot; | |
630 | unsigned int ulcon; | |
631 | unsigned int umcon; | |
632 | ||
633 | /* | |
634 | * We don't support modem control lines. | |
635 | */ | |
636 | termios->c_cflag &= ~(HUPCL | CMSPAR); | |
637 | termios->c_cflag |= CLOCAL; | |
638 | ||
639 | /* | |
640 | * Ask the core to calculate the divisor for us. | |
641 | */ | |
642 | ||
643 | baud = uart_get_baud_rate(port, termios, old, 0, 115200*8); | |
644 | ||
645 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) | |
646 | quot = port->custom_divisor; | |
647 | else | |
648 | quot = s3c24xx_serial_getclk(port, &clksrc, &clk, baud); | |
649 | ||
650 | /* check to see if we need to change clock source */ | |
651 | ||
652 | if (ourport->clksrc != clksrc || ourport->baudclk != clk) { | |
653 | s3c24xx_serial_setsource(port, clksrc); | |
654 | ||
655 | if (ourport->baudclk != NULL && !IS_ERR(ourport->baudclk)) { | |
656 | clk_disable(ourport->baudclk); | |
657 | ourport->baudclk = NULL; | |
658 | } | |
659 | ||
660 | clk_enable(clk); | |
661 | ||
662 | ourport->clksrc = clksrc; | |
663 | ourport->baudclk = clk; | |
664 | } | |
665 | ||
666 | switch (termios->c_cflag & CSIZE) { | |
667 | case CS5: | |
668 | dbg("config: 5bits/char\n"); | |
669 | ulcon = S3C2410_LCON_CS5; | |
670 | break; | |
671 | case CS6: | |
672 | dbg("config: 6bits/char\n"); | |
673 | ulcon = S3C2410_LCON_CS6; | |
674 | break; | |
675 | case CS7: | |
676 | dbg("config: 7bits/char\n"); | |
677 | ulcon = S3C2410_LCON_CS7; | |
678 | break; | |
679 | case CS8: | |
680 | default: | |
681 | dbg("config: 8bits/char\n"); | |
682 | ulcon = S3C2410_LCON_CS8; | |
683 | break; | |
684 | } | |
685 | ||
686 | /* preserve original lcon IR settings */ | |
687 | ulcon |= (cfg->ulcon & S3C2410_LCON_IRM); | |
688 | ||
689 | if (termios->c_cflag & CSTOPB) | |
690 | ulcon |= S3C2410_LCON_STOPB; | |
691 | ||
692 | umcon = (termios->c_cflag & CRTSCTS) ? S3C2410_UMCOM_AFC : 0; | |
693 | ||
694 | if (termios->c_cflag & PARENB) { | |
695 | if (termios->c_cflag & PARODD) | |
696 | ulcon |= S3C2410_LCON_PODD; | |
697 | else | |
698 | ulcon |= S3C2410_LCON_PEVEN; | |
699 | } else { | |
700 | ulcon |= S3C2410_LCON_PNONE; | |
701 | } | |
702 | ||
703 | spin_lock_irqsave(&port->lock, flags); | |
704 | ||
705 | dbg("setting ulcon to %08x, brddiv to %d\n", ulcon, quot); | |
706 | ||
707 | wr_regl(port, S3C2410_ULCON, ulcon); | |
708 | wr_regl(port, S3C2410_UBRDIV, quot); | |
709 | wr_regl(port, S3C2410_UMCON, umcon); | |
710 | ||
711 | dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n", | |
712 | rd_regl(port, S3C2410_ULCON), | |
713 | rd_regl(port, S3C2410_UCON), | |
714 | rd_regl(port, S3C2410_UFCON)); | |
715 | ||
716 | /* | |
717 | * Update the per-port timeout. | |
718 | */ | |
719 | uart_update_timeout(port, termios->c_cflag, baud); | |
720 | ||
721 | /* | |
722 | * Which character status flags are we interested in? | |
723 | */ | |
724 | port->read_status_mask = S3C2410_UERSTAT_OVERRUN; | |
725 | if (termios->c_iflag & INPCK) | |
726 | port->read_status_mask |= S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_PARITY; | |
727 | ||
728 | /* | |
729 | * Which character status flags should we ignore? | |
730 | */ | |
731 | port->ignore_status_mask = 0; | |
732 | if (termios->c_iflag & IGNPAR) | |
733 | port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN; | |
734 | if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR) | |
735 | port->ignore_status_mask |= S3C2410_UERSTAT_FRAME; | |
736 | ||
737 | /* | |
738 | * Ignore all characters if CREAD is not set. | |
739 | */ | |
740 | if ((termios->c_cflag & CREAD) == 0) | |
741 | port->ignore_status_mask |= RXSTAT_DUMMY_READ; | |
742 | ||
743 | spin_unlock_irqrestore(&port->lock, flags); | |
744 | } | |
745 | ||
746 | static const char *s3c24xx_serial_type(struct uart_port *port) | |
747 | { | |
748 | switch (port->type) { | |
749 | case PORT_S3C2410: | |
750 | return "S3C2410"; | |
751 | case PORT_S3C2440: | |
752 | return "S3C2440"; | |
753 | case PORT_S3C2412: | |
754 | return "S3C2412"; | |
755 | default: | |
756 | return NULL; | |
757 | } | |
758 | } | |
759 | ||
760 | #define MAP_SIZE (0x100) | |
761 | ||
762 | static void s3c24xx_serial_release_port(struct uart_port *port) | |
763 | { | |
764 | release_mem_region(port->mapbase, MAP_SIZE); | |
765 | } | |
766 | ||
767 | static int s3c24xx_serial_request_port(struct uart_port *port) | |
768 | { | |
769 | const char *name = s3c24xx_serial_portname(port); | |
770 | return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY; | |
771 | } | |
772 | ||
773 | static void s3c24xx_serial_config_port(struct uart_port *port, int flags) | |
774 | { | |
775 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
776 | ||
777 | if (flags & UART_CONFIG_TYPE && | |
778 | s3c24xx_serial_request_port(port) == 0) | |
779 | port->type = info->type; | |
780 | } | |
781 | ||
782 | /* | |
783 | * verify the new serial_struct (for TIOCSSERIAL). | |
784 | */ | |
785 | static int | |
786 | s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser) | |
787 | { | |
788 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
789 | ||
790 | if (ser->type != PORT_UNKNOWN && ser->type != info->type) | |
791 | return -EINVAL; | |
792 | ||
793 | return 0; | |
794 | } | |
795 | ||
796 | ||
797 | #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE | |
798 | ||
799 | static struct console s3c24xx_serial_console; | |
800 | ||
801 | #define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console | |
802 | #else | |
803 | #define S3C24XX_SERIAL_CONSOLE NULL | |
804 | #endif | |
805 | ||
806 | static struct uart_ops s3c24xx_serial_ops = { | |
807 | .pm = s3c24xx_serial_pm, | |
808 | .tx_empty = s3c24xx_serial_tx_empty, | |
809 | .get_mctrl = s3c24xx_serial_get_mctrl, | |
810 | .set_mctrl = s3c24xx_serial_set_mctrl, | |
811 | .stop_tx = s3c24xx_serial_stop_tx, | |
812 | .start_tx = s3c24xx_serial_start_tx, | |
813 | .stop_rx = s3c24xx_serial_stop_rx, | |
814 | .enable_ms = s3c24xx_serial_enable_ms, | |
815 | .break_ctl = s3c24xx_serial_break_ctl, | |
816 | .startup = s3c24xx_serial_startup, | |
817 | .shutdown = s3c24xx_serial_shutdown, | |
818 | .set_termios = s3c24xx_serial_set_termios, | |
819 | .type = s3c24xx_serial_type, | |
820 | .release_port = s3c24xx_serial_release_port, | |
821 | .request_port = s3c24xx_serial_request_port, | |
822 | .config_port = s3c24xx_serial_config_port, | |
823 | .verify_port = s3c24xx_serial_verify_port, | |
824 | }; | |
825 | ||
826 | ||
827 | static struct uart_driver s3c24xx_uart_drv = { | |
828 | .owner = THIS_MODULE, | |
829 | .dev_name = "s3c2410_serial", | |
830 | .nr = 3, | |
831 | .cons = S3C24XX_SERIAL_CONSOLE, | |
832 | .driver_name = S3C24XX_SERIAL_NAME, | |
833 | .major = S3C24XX_SERIAL_MAJOR, | |
834 | .minor = S3C24XX_SERIAL_MINOR, | |
835 | }; | |
836 | ||
837 | static struct s3c24xx_uart_port s3c24xx_serial_ports[NR_PORTS] = { | |
838 | [0] = { | |
839 | .port = { | |
840 | .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[0].port.lock), | |
841 | .iotype = UPIO_MEM, | |
842 | .irq = IRQ_S3CUART_RX0, | |
843 | .uartclk = 0, | |
844 | .fifosize = 16, | |
845 | .ops = &s3c24xx_serial_ops, | |
846 | .flags = UPF_BOOT_AUTOCONF, | |
847 | .line = 0, | |
848 | } | |
849 | }, | |
850 | [1] = { | |
851 | .port = { | |
852 | .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[1].port.lock), | |
853 | .iotype = UPIO_MEM, | |
854 | .irq = IRQ_S3CUART_RX1, | |
855 | .uartclk = 0, | |
856 | .fifosize = 16, | |
857 | .ops = &s3c24xx_serial_ops, | |
858 | .flags = UPF_BOOT_AUTOCONF, | |
859 | .line = 1, | |
860 | } | |
861 | }, | |
862 | #if NR_PORTS > 2 | |
863 | ||
864 | [2] = { | |
865 | .port = { | |
866 | .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[2].port.lock), | |
867 | .iotype = UPIO_MEM, | |
868 | .irq = IRQ_S3CUART_RX2, | |
869 | .uartclk = 0, | |
870 | .fifosize = 16, | |
871 | .ops = &s3c24xx_serial_ops, | |
872 | .flags = UPF_BOOT_AUTOCONF, | |
873 | .line = 2, | |
874 | } | |
875 | } | |
876 | #endif | |
877 | }; | |
878 | ||
879 | /* s3c24xx_serial_resetport | |
880 | * | |
881 | * wrapper to call the specific reset for this port (reset the fifos | |
882 | * and the settings) | |
883 | */ | |
884 | ||
885 | static inline int s3c24xx_serial_resetport(struct uart_port *port, | |
886 | struct s3c2410_uartcfg *cfg) | |
887 | { | |
888 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
889 | ||
890 | return (info->reset_port)(port, cfg); | |
891 | } | |
892 | ||
893 | /* s3c24xx_serial_init_port | |
894 | * | |
895 | * initialise a single serial port from the platform device given | |
896 | */ | |
897 | ||
898 | static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport, | |
899 | struct s3c24xx_uart_info *info, | |
900 | struct platform_device *platdev) | |
901 | { | |
902 | struct uart_port *port = &ourport->port; | |
903 | struct s3c2410_uartcfg *cfg; | |
904 | struct resource *res; | |
905 | int ret; | |
906 | ||
907 | dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev); | |
908 | ||
909 | if (platdev == NULL) | |
910 | return -ENODEV; | |
911 | ||
912 | cfg = s3c24xx_dev_to_cfg(&platdev->dev); | |
913 | ||
914 | if (port->mapbase != 0) | |
915 | return 0; | |
916 | ||
917 | if (cfg->hwport > 3) | |
918 | return -EINVAL; | |
919 | ||
920 | /* setup info for port */ | |
921 | port->dev = &platdev->dev; | |
922 | ourport->info = info; | |
923 | ||
924 | /* copy the info in from provided structure */ | |
925 | ourport->port.fifosize = info->fifosize; | |
926 | ||
927 | dbg("s3c24xx_serial_init_port: %p (hw %d)...\n", port, cfg->hwport); | |
928 | ||
929 | port->uartclk = 1; | |
930 | ||
931 | if (cfg->uart_flags & UPF_CONS_FLOW) { | |
932 | dbg("s3c24xx_serial_init_port: enabling flow control\n"); | |
933 | port->flags |= UPF_CONS_FLOW; | |
934 | } | |
935 | ||
936 | /* sort our the physical and virtual addresses for each UART */ | |
937 | ||
938 | res = platform_get_resource(platdev, IORESOURCE_MEM, 0); | |
939 | if (res == NULL) { | |
940 | printk(KERN_ERR "failed to find memory resource for uart\n"); | |
941 | return -EINVAL; | |
942 | } | |
943 | ||
944 | dbg("resource %p (%lx..%lx)\n", res, res->start, res->end); | |
945 | ||
946 | port->mapbase = res->start; | |
947 | port->membase = S3C24XX_VA_UART + (res->start - S3C24XX_PA_UART); | |
948 | ret = platform_get_irq(platdev, 0); | |
949 | if (ret < 0) | |
950 | port->irq = 0; | |
951 | else | |
952 | port->irq = ret; | |
953 | ||
954 | ourport->clk = clk_get(&platdev->dev, "uart"); | |
955 | ||
956 | dbg("port: map=%08x, mem=%08x, irq=%d, clock=%ld\n", | |
957 | port->mapbase, port->membase, port->irq, port->uartclk); | |
958 | ||
959 | /* reset the fifos (and setup the uart) */ | |
960 | s3c24xx_serial_resetport(port, cfg); | |
961 | return 0; | |
962 | } | |
963 | ||
964 | static ssize_t s3c24xx_serial_show_clksrc(struct device *dev, | |
965 | struct device_attribute *attr, | |
966 | char *buf) | |
967 | { | |
968 | struct uart_port *port = s3c24xx_dev_to_port(dev); | |
969 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
970 | ||
971 | return snprintf(buf, PAGE_SIZE, "* %s\n", ourport->clksrc->name); | |
972 | } | |
973 | ||
974 | static DEVICE_ATTR(clock_source, S_IRUGO, s3c24xx_serial_show_clksrc, NULL); | |
975 | ||
976 | /* Device driver serial port probe */ | |
977 | ||
978 | static int probe_index; | |
979 | ||
980 | int s3c24xx_serial_probe(struct platform_device *dev, | |
981 | struct s3c24xx_uart_info *info) | |
982 | { | |
983 | struct s3c24xx_uart_port *ourport; | |
984 | int ret; | |
985 | ||
986 | dbg("s3c24xx_serial_probe(%p, %p) %d\n", dev, info, probe_index); | |
987 | ||
988 | ourport = &s3c24xx_serial_ports[probe_index]; | |
989 | probe_index++; | |
990 | ||
991 | dbg("%s: initialising port %p...\n", __func__, ourport); | |
992 | ||
993 | ret = s3c24xx_serial_init_port(ourport, info, dev); | |
994 | if (ret < 0) | |
995 | goto probe_err; | |
996 | ||
997 | dbg("%s: adding port\n", __func__); | |
998 | uart_add_one_port(&s3c24xx_uart_drv, &ourport->port); | |
999 | platform_set_drvdata(dev, &ourport->port); | |
1000 | ||
1001 | ret = device_create_file(&dev->dev, &dev_attr_clock_source); | |
1002 | if (ret < 0) | |
1003 | printk(KERN_ERR "%s: failed to add clksrc attr.\n", __func__); | |
1004 | ||
1005 | return 0; | |
1006 | ||
1007 | probe_err: | |
1008 | return ret; | |
1009 | } | |
1010 | ||
1011 | EXPORT_SYMBOL_GPL(s3c24xx_serial_probe); | |
1012 | ||
1013 | int s3c24xx_serial_remove(struct platform_device *dev) | |
1014 | { | |
1015 | struct uart_port *port = s3c24xx_dev_to_port(&dev->dev); | |
1016 | ||
1017 | if (port) { | |
1018 | device_remove_file(&dev->dev, &dev_attr_clock_source); | |
1019 | uart_remove_one_port(&s3c24xx_uart_drv, port); | |
1020 | } | |
1021 | ||
1022 | return 0; | |
1023 | } | |
1024 | ||
1025 | EXPORT_SYMBOL_GPL(s3c24xx_serial_remove); | |
1026 | ||
1027 | /* UART power management code */ | |
1028 | ||
1029 | #ifdef CONFIG_PM | |
1030 | ||
1031 | static int s3c24xx_serial_suspend(struct platform_device *dev, pm_message_t state) | |
1032 | { | |
1033 | struct uart_port *port = s3c24xx_dev_to_port(&dev->dev); | |
1034 | ||
1035 | if (port) | |
1036 | uart_suspend_port(&s3c24xx_uart_drv, port); | |
1037 | ||
1038 | return 0; | |
1039 | } | |
1040 | ||
1041 | static int s3c24xx_serial_resume(struct platform_device *dev) | |
1042 | { | |
1043 | struct uart_port *port = s3c24xx_dev_to_port(&dev->dev); | |
1044 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
1045 | ||
1046 | if (port) { | |
1047 | clk_enable(ourport->clk); | |
1048 | s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port)); | |
1049 | clk_disable(ourport->clk); | |
1050 | ||
1051 | uart_resume_port(&s3c24xx_uart_drv, port); | |
1052 | } | |
1053 | ||
1054 | return 0; | |
1055 | } | |
1056 | #endif | |
1057 | ||
1058 | int s3c24xx_serial_init(struct platform_driver *drv, | |
1059 | struct s3c24xx_uart_info *info) | |
1060 | { | |
1061 | dbg("s3c24xx_serial_init(%p,%p)\n", drv, info); | |
1062 | ||
1063 | #ifdef CONFIG_PM | |
1064 | drv->suspend = s3c24xx_serial_suspend; | |
1065 | drv->resume = s3c24xx_serial_resume; | |
1066 | #endif | |
1067 | ||
1068 | return platform_driver_register(drv); | |
1069 | } | |
1070 | ||
1071 | EXPORT_SYMBOL_GPL(s3c24xx_serial_init); | |
1072 | ||
1073 | /* module initialisation code */ | |
1074 | ||
1075 | static int __init s3c24xx_serial_modinit(void) | |
1076 | { | |
1077 | int ret; | |
1078 | ||
1079 | ret = uart_register_driver(&s3c24xx_uart_drv); | |
1080 | if (ret < 0) { | |
1081 | printk(KERN_ERR "failed to register UART driver\n"); | |
1082 | return -1; | |
1083 | } | |
1084 | ||
1085 | return 0; | |
1086 | } | |
1087 | ||
1088 | static void __exit s3c24xx_serial_modexit(void) | |
1089 | { | |
1090 | uart_unregister_driver(&s3c24xx_uart_drv); | |
1091 | } | |
1092 | ||
1093 | module_init(s3c24xx_serial_modinit); | |
1094 | module_exit(s3c24xx_serial_modexit); | |
1095 | ||
1096 | /* Console code */ | |
1097 | ||
1098 | #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE | |
1099 | ||
1100 | static struct uart_port *cons_uart; | |
1101 | ||
1102 | static int | |
1103 | s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon) | |
1104 | { | |
1105 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
1106 | unsigned long ufstat, utrstat; | |
1107 | ||
1108 | if (ufcon & S3C2410_UFCON_FIFOMODE) { | |
1109 | /* fifo mode - check ammount of data in fifo registers... */ | |
1110 | ||
1111 | ufstat = rd_regl(port, S3C2410_UFSTAT); | |
1112 | return (ufstat & info->tx_fifofull) ? 0 : 1; | |
1113 | } | |
1114 | ||
1115 | /* in non-fifo mode, we go and use the tx buffer empty */ | |
1116 | ||
1117 | utrstat = rd_regl(port, S3C2410_UTRSTAT); | |
1118 | return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0; | |
1119 | } | |
1120 | ||
1121 | static void | |
1122 | s3c24xx_serial_console_putchar(struct uart_port *port, int ch) | |
1123 | { | |
1124 | unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON); | |
1125 | while (!s3c24xx_serial_console_txrdy(port, ufcon)) | |
1126 | barrier(); | |
1127 | wr_regb(cons_uart, S3C2410_UTXH, ch); | |
1128 | } | |
1129 | ||
1130 | static void | |
1131 | s3c24xx_serial_console_write(struct console *co, const char *s, | |
1132 | unsigned int count) | |
1133 | { | |
1134 | uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar); | |
1135 | } | |
1136 | ||
1137 | static void __init | |
1138 | s3c24xx_serial_get_options(struct uart_port *port, int *baud, | |
1139 | int *parity, int *bits) | |
1140 | { | |
1141 | struct s3c24xx_uart_clksrc clksrc; | |
1142 | struct clk *clk; | |
1143 | unsigned int ulcon; | |
1144 | unsigned int ucon; | |
1145 | unsigned int ubrdiv; | |
1146 | unsigned long rate; | |
1147 | ||
1148 | ulcon = rd_regl(port, S3C2410_ULCON); | |
1149 | ucon = rd_regl(port, S3C2410_UCON); | |
1150 | ubrdiv = rd_regl(port, S3C2410_UBRDIV); | |
1151 | ||
1152 | dbg("s3c24xx_serial_get_options: port=%p\n" | |
1153 | "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n", | |
1154 | port, ulcon, ucon, ubrdiv); | |
1155 | ||
1156 | if ((ucon & 0xf) != 0) { | |
1157 | /* consider the serial port configured if the tx/rx mode set */ | |
1158 | ||
1159 | switch (ulcon & S3C2410_LCON_CSMASK) { | |
1160 | case S3C2410_LCON_CS5: | |
1161 | *bits = 5; | |
1162 | break; | |
1163 | case S3C2410_LCON_CS6: | |
1164 | *bits = 6; | |
1165 | break; | |
1166 | case S3C2410_LCON_CS7: | |
1167 | *bits = 7; | |
1168 | break; | |
1169 | default: | |
1170 | case S3C2410_LCON_CS8: | |
1171 | *bits = 8; | |
1172 | break; | |
1173 | } | |
1174 | ||
1175 | switch (ulcon & S3C2410_LCON_PMASK) { | |
1176 | case S3C2410_LCON_PEVEN: | |
1177 | *parity = 'e'; | |
1178 | break; | |
1179 | ||
1180 | case S3C2410_LCON_PODD: | |
1181 | *parity = 'o'; | |
1182 | break; | |
1183 | ||
1184 | case S3C2410_LCON_PNONE: | |
1185 | default: | |
1186 | *parity = 'n'; | |
1187 | } | |
1188 | ||
1189 | /* now calculate the baud rate */ | |
1190 | ||
1191 | s3c24xx_serial_getsource(port, &clksrc); | |
1192 | ||
1193 | clk = clk_get(port->dev, clksrc.name); | |
1194 | if (!IS_ERR(clk) && clk != NULL) | |
1195 | rate = clk_get_rate(clk) / clksrc.divisor; | |
1196 | else | |
1197 | rate = 1; | |
1198 | ||
1199 | ||
1200 | *baud = rate / (16 * (ubrdiv + 1)); | |
1201 | dbg("calculated baud %d\n", *baud); | |
1202 | } | |
1203 | ||
1204 | } | |
1205 | ||
1206 | /* s3c24xx_serial_init_ports | |
1207 | * | |
1208 | * initialise the serial ports from the machine provided initialisation | |
1209 | * data. | |
1210 | */ | |
1211 | ||
1212 | static int s3c24xx_serial_init_ports(struct s3c24xx_uart_info *info) | |
1213 | { | |
1214 | struct s3c24xx_uart_port *ptr = s3c24xx_serial_ports; | |
1215 | struct platform_device **platdev_ptr; | |
1216 | int i; | |
1217 | ||
1218 | dbg("s3c24xx_serial_init_ports: initialising ports...\n"); | |
1219 | ||
1220 | platdev_ptr = s3c24xx_uart_devs; | |
1221 | ||
1222 | for (i = 0; i < NR_PORTS; i++, ptr++, platdev_ptr++) { | |
1223 | s3c24xx_serial_init_port(ptr, info, *platdev_ptr); | |
1224 | } | |
1225 | ||
1226 | return 0; | |
1227 | } | |
1228 | ||
1229 | static int __init | |
1230 | s3c24xx_serial_console_setup(struct console *co, char *options) | |
1231 | { | |
1232 | struct uart_port *port; | |
1233 | int baud = 9600; | |
1234 | int bits = 8; | |
1235 | int parity = 'n'; | |
1236 | int flow = 'n'; | |
1237 | ||
1238 | dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n", | |
1239 | co, co->index, options); | |
1240 | ||
1241 | /* is this a valid port */ | |
1242 | ||
1243 | if (co->index == -1 || co->index >= NR_PORTS) | |
1244 | co->index = 0; | |
1245 | ||
1246 | port = &s3c24xx_serial_ports[co->index].port; | |
1247 | ||
1248 | /* is the port configured? */ | |
1249 | ||
1250 | if (port->mapbase == 0x0) { | |
1251 | co->index = 0; | |
1252 | port = &s3c24xx_serial_ports[co->index].port; | |
1253 | } | |
1254 | ||
1255 | cons_uart = port; | |
1256 | ||
1257 | dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index); | |
1258 | ||
1259 | /* | |
1260 | * Check whether an invalid uart number has been specified, and | |
1261 | * if so, search for the first available port that does have | |
1262 | * console support. | |
1263 | */ | |
1264 | if (options) | |
1265 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
1266 | else | |
1267 | s3c24xx_serial_get_options(port, &baud, &parity, &bits); | |
1268 | ||
1269 | dbg("s3c24xx_serial_console_setup: baud %d\n", baud); | |
1270 | ||
1271 | return uart_set_options(port, co, baud, parity, bits, flow); | |
1272 | } | |
1273 | ||
1274 | /* s3c24xx_serial_initconsole | |
1275 | * | |
1276 | * initialise the console from one of the uart drivers | |
1277 | */ | |
1278 | ||
1279 | static struct console s3c24xx_serial_console = { | |
1280 | .name = S3C24XX_SERIAL_NAME, | |
1281 | .device = uart_console_device, | |
1282 | .flags = CON_PRINTBUFFER, | |
1283 | .index = -1, | |
1284 | .write = s3c24xx_serial_console_write, | |
1285 | .setup = s3c24xx_serial_console_setup | |
1286 | }; | |
1287 | ||
1288 | int s3c24xx_serial_initconsole(struct platform_driver *drv, | |
1289 | struct s3c24xx_uart_info *info) | |
1290 | ||
1291 | { | |
1292 | struct platform_device *dev = s3c24xx_uart_devs[0]; | |
1293 | ||
1294 | dbg("s3c24xx_serial_initconsole\n"); | |
1295 | ||
1296 | /* select driver based on the cpu */ | |
1297 | ||
1298 | if (dev == NULL) { | |
1299 | printk(KERN_ERR "s3c24xx: no devices for console init\n"); | |
1300 | return 0; | |
1301 | } | |
1302 | ||
1303 | if (strcmp(dev->name, drv->driver.name) != 0) | |
1304 | return 0; | |
1305 | ||
1306 | s3c24xx_serial_console.data = &s3c24xx_uart_drv; | |
1307 | s3c24xx_serial_init_ports(info); | |
1308 | ||
1309 | register_console(&s3c24xx_serial_console); | |
1310 | return 0; | |
1311 | } | |
1312 | ||
1313 | #endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */ | |
1314 | ||
1315 | MODULE_DESCRIPTION("Samsung SoC Serial port driver"); | |
1316 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); | |
1317 | MODULE_LICENSE("GPL v2"); |