Commit | Line | Data |
---|---|---|
05a78966 | 1 | /* linux/drivers/serial/s3c2410.c |
1da177e4 | 2 | * |
05a78966 | 3 | * Driver for Samsung SoC onboard UARTs. |
1da177e4 | 4 | * |
05a78966 BD |
5 | * Ben Dooks, Copyright (c) 2003-2005 Simtec Electronics |
6 | * http://armlinux.simtec.co.uk/ | |
1da177e4 LT |
7 | */ |
8 | ||
9 | /* Note on 2440 fclk clock source handling | |
10 | * | |
11 | * Whilst it is possible to use the fclk as clock source, the method | |
12 | * of properly switching too/from this is currently un-implemented, so | |
13 | * whichever way is configured at startup is the one that will be used. | |
14 | */ | |
15 | ||
16 | /* Hote on 2410 error handling | |
17 | * | |
18 | * The s3c2410 manual has a love/hate affair with the contents of the | |
19 | * UERSTAT register in the UART blocks, and keeps marking some of the | |
20 | * error bits as reserved. Having checked with the s3c2410x01, | |
21 | * it copes with BREAKs properly, so I am happy to ignore the RESERVED | |
22 | * feature from the latter versions of the manual. | |
23 | * | |
24 | * If it becomes aparrent that latter versions of the 2410 remove these | |
25 | * bits, then action will have to be taken to differentiate the versions | |
26 | * and change the policy on BREAK | |
27 | * | |
28 | * BJD, 04-Nov-2004 | |
29 | */ | |
30 | ||
1da177e4 LT |
31 | |
32 | #if defined(CONFIG_SERIAL_S3C2410_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
33 | #define SUPPORT_SYSRQ | |
34 | #endif | |
35 | ||
36 | #include <linux/module.h> | |
37 | #include <linux/ioport.h> | |
d052d1be | 38 | #include <linux/platform_device.h> |
1da177e4 LT |
39 | #include <linux/init.h> |
40 | #include <linux/sysrq.h> | |
41 | #include <linux/console.h> | |
42 | #include <linux/tty.h> | |
43 | #include <linux/tty_flip.h> | |
44 | #include <linux/serial_core.h> | |
45 | #include <linux/serial.h> | |
46 | #include <linux/delay.h> | |
f8ce2547 | 47 | #include <linux/clk.h> |
1da177e4 LT |
48 | |
49 | #include <asm/io.h> | |
50 | #include <asm/irq.h> | |
51 | ||
52 | #include <asm/hardware.h> | |
1da177e4 | 53 | |
531b617c | 54 | #include <asm/plat-s3c/regs-serial.h> |
1da177e4 LT |
55 | #include <asm/arch/regs-gpio.h> |
56 | ||
1da177e4 LT |
57 | /* structures */ |
58 | ||
59 | struct s3c24xx_uart_info { | |
60 | char *name; | |
61 | unsigned int type; | |
62 | unsigned int fifosize; | |
63 | unsigned long rx_fifomask; | |
64 | unsigned long rx_fifoshift; | |
65 | unsigned long rx_fifofull; | |
66 | unsigned long tx_fifomask; | |
67 | unsigned long tx_fifoshift; | |
68 | unsigned long tx_fifofull; | |
69 | ||
70 | /* clock source control */ | |
71 | ||
72 | int (*get_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk); | |
73 | int (*set_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk); | |
74 | ||
75 | /* uart controls */ | |
76 | int (*reset_port)(struct uart_port *, struct s3c2410_uartcfg *); | |
77 | }; | |
78 | ||
79 | struct s3c24xx_uart_port { | |
80 | unsigned char rx_claimed; | |
81 | unsigned char tx_claimed; | |
82 | ||
83 | struct s3c24xx_uart_info *info; | |
84 | struct s3c24xx_uart_clksrc *clksrc; | |
85 | struct clk *clk; | |
86 | struct clk *baudclk; | |
87 | struct uart_port port; | |
88 | }; | |
89 | ||
90 | ||
91 | /* configuration defines */ | |
92 | ||
93 | #if 0 | |
94 | #if 1 | |
95 | /* send debug to the low-level output routines */ | |
96 | ||
97 | extern void printascii(const char *); | |
98 | ||
99 | static void | |
100 | s3c24xx_serial_dbg(const char *fmt, ...) | |
101 | { | |
102 | va_list va; | |
103 | char buff[256]; | |
104 | ||
105 | va_start(va, fmt); | |
106 | vsprintf(buff, fmt, va); | |
107 | va_end(va); | |
108 | ||
109 | printascii(buff); | |
110 | } | |
111 | ||
112 | #define dbg(x...) s3c24xx_serial_dbg(x) | |
113 | ||
114 | #else | |
115 | #define dbg(x...) printk(KERN_DEBUG "s3c24xx: "); | |
116 | #endif | |
117 | #else /* no debug */ | |
118 | #define dbg(x...) do {} while(0) | |
119 | #endif | |
120 | ||
121 | /* UART name and device definitions */ | |
122 | ||
123 | #define S3C24XX_SERIAL_NAME "ttySAC" | |
1da177e4 LT |
124 | #define S3C24XX_SERIAL_MAJOR 204 |
125 | #define S3C24XX_SERIAL_MINOR 64 | |
126 | ||
127 | ||
128 | /* conversion functions */ | |
129 | ||
130 | #define s3c24xx_dev_to_port(__dev) (struct uart_port *)dev_get_drvdata(__dev) | |
131 | #define s3c24xx_dev_to_cfg(__dev) (struct s3c2410_uartcfg *)((__dev)->platform_data) | |
132 | ||
133 | /* we can support 3 uarts, but not always use them */ | |
134 | ||
5cba7429 LCVR |
135 | #ifdef CONFIG_CPU_S3C2400 |
136 | #define NR_PORTS (2) | |
137 | #else | |
1da177e4 | 138 | #define NR_PORTS (3) |
5cba7429 | 139 | #endif |
1da177e4 LT |
140 | |
141 | /* port irq numbers */ | |
142 | ||
143 | #define TX_IRQ(port) ((port)->irq + 1) | |
144 | #define RX_IRQ(port) ((port)->irq) | |
145 | ||
146 | /* register access controls */ | |
147 | ||
148 | #define portaddr(port, reg) ((port)->membase + (reg)) | |
149 | ||
150 | #define rd_regb(port, reg) (__raw_readb(portaddr(port, reg))) | |
151 | #define rd_regl(port, reg) (__raw_readl(portaddr(port, reg))) | |
152 | ||
153 | #define wr_regb(port, reg, val) \ | |
154 | do { __raw_writeb(val, portaddr(port, reg)); } while(0) | |
155 | ||
156 | #define wr_regl(port, reg, val) \ | |
157 | do { __raw_writel(val, portaddr(port, reg)); } while(0) | |
158 | ||
159 | /* macros to change one thing to another */ | |
160 | ||
161 | #define tx_enabled(port) ((port)->unused[0]) | |
162 | #define rx_enabled(port) ((port)->unused[1]) | |
163 | ||
164 | /* flag to ignore all characters comming in */ | |
165 | #define RXSTAT_DUMMY_READ (0x10000000) | |
166 | ||
167 | static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port) | |
168 | { | |
169 | return container_of(port, struct s3c24xx_uart_port, port); | |
170 | } | |
171 | ||
172 | /* translate a port to the device name */ | |
173 | ||
d9dc5804 | 174 | static inline const char *s3c24xx_serial_portname(struct uart_port *port) |
1da177e4 LT |
175 | { |
176 | return to_platform_device(port->dev)->name; | |
177 | } | |
178 | ||
179 | static int s3c24xx_serial_txempty_nofifo(struct uart_port *port) | |
180 | { | |
181 | return (rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE); | |
182 | } | |
183 | ||
184 | static void s3c24xx_serial_rx_enable(struct uart_port *port) | |
185 | { | |
186 | unsigned long flags; | |
187 | unsigned int ucon, ufcon; | |
188 | int count = 10000; | |
189 | ||
190 | spin_lock_irqsave(&port->lock, flags); | |
191 | ||
192 | while (--count && !s3c24xx_serial_txempty_nofifo(port)) | |
193 | udelay(100); | |
194 | ||
195 | ufcon = rd_regl(port, S3C2410_UFCON); | |
196 | ufcon |= S3C2410_UFCON_RESETRX; | |
197 | wr_regl(port, S3C2410_UFCON, ufcon); | |
198 | ||
199 | ucon = rd_regl(port, S3C2410_UCON); | |
200 | ucon |= S3C2410_UCON_RXIRQMODE; | |
201 | wr_regl(port, S3C2410_UCON, ucon); | |
202 | ||
203 | rx_enabled(port) = 1; | |
204 | spin_unlock_irqrestore(&port->lock, flags); | |
205 | } | |
206 | ||
207 | static void s3c24xx_serial_rx_disable(struct uart_port *port) | |
208 | { | |
209 | unsigned long flags; | |
210 | unsigned int ucon; | |
211 | ||
212 | spin_lock_irqsave(&port->lock, flags); | |
213 | ||
214 | ucon = rd_regl(port, S3C2410_UCON); | |
215 | ucon &= ~S3C2410_UCON_RXIRQMODE; | |
216 | wr_regl(port, S3C2410_UCON, ucon); | |
217 | ||
218 | rx_enabled(port) = 0; | |
219 | spin_unlock_irqrestore(&port->lock, flags); | |
220 | } | |
221 | ||
b129a8cc | 222 | static void s3c24xx_serial_stop_tx(struct uart_port *port) |
1da177e4 LT |
223 | { |
224 | if (tx_enabled(port)) { | |
225 | disable_irq(TX_IRQ(port)); | |
226 | tx_enabled(port) = 0; | |
227 | if (port->flags & UPF_CONS_FLOW) | |
228 | s3c24xx_serial_rx_enable(port); | |
229 | } | |
230 | } | |
231 | ||
b129a8cc | 232 | static void s3c24xx_serial_start_tx(struct uart_port *port) |
1da177e4 LT |
233 | { |
234 | if (!tx_enabled(port)) { | |
235 | if (port->flags & UPF_CONS_FLOW) | |
236 | s3c24xx_serial_rx_disable(port); | |
237 | ||
238 | enable_irq(TX_IRQ(port)); | |
239 | tx_enabled(port) = 1; | |
240 | } | |
241 | } | |
242 | ||
243 | ||
244 | static void s3c24xx_serial_stop_rx(struct uart_port *port) | |
245 | { | |
246 | if (rx_enabled(port)) { | |
247 | dbg("s3c24xx_serial_stop_rx: port=%p\n", port); | |
248 | disable_irq(RX_IRQ(port)); | |
249 | rx_enabled(port) = 0; | |
250 | } | |
251 | } | |
252 | ||
253 | static void s3c24xx_serial_enable_ms(struct uart_port *port) | |
254 | { | |
255 | } | |
256 | ||
257 | static inline struct s3c24xx_uart_info *s3c24xx_port_to_info(struct uart_port *port) | |
258 | { | |
259 | return to_ourport(port)->info; | |
260 | } | |
261 | ||
262 | static inline struct s3c2410_uartcfg *s3c24xx_port_to_cfg(struct uart_port *port) | |
263 | { | |
264 | if (port->dev == NULL) | |
265 | return NULL; | |
266 | ||
267 | return (struct s3c2410_uartcfg *)port->dev->platform_data; | |
268 | } | |
269 | ||
270 | static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport, | |
271 | unsigned long ufstat) | |
272 | { | |
273 | struct s3c24xx_uart_info *info = ourport->info; | |
274 | ||
275 | if (ufstat & info->rx_fifofull) | |
276 | return info->fifosize; | |
277 | ||
278 | return (ufstat & info->rx_fifomask) >> info->rx_fifoshift; | |
279 | } | |
280 | ||
281 | ||
282 | /* ? - where has parity gone?? */ | |
283 | #define S3C2410_UERSTAT_PARITY (0x1000) | |
284 | ||
285 | static irqreturn_t | |
7d12e780 | 286 | s3c24xx_serial_rx_chars(int irq, void *dev_id) |
1da177e4 LT |
287 | { |
288 | struct s3c24xx_uart_port *ourport = dev_id; | |
289 | struct uart_port *port = &ourport->port; | |
290 | struct tty_struct *tty = port->info->tty; | |
291 | unsigned int ufcon, ch, flag, ufstat, uerstat; | |
292 | int max_count = 64; | |
293 | ||
294 | while (max_count-- > 0) { | |
295 | ufcon = rd_regl(port, S3C2410_UFCON); | |
296 | ufstat = rd_regl(port, S3C2410_UFSTAT); | |
297 | ||
298 | if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0) | |
299 | break; | |
300 | ||
1da177e4 LT |
301 | uerstat = rd_regl(port, S3C2410_UERSTAT); |
302 | ch = rd_regb(port, S3C2410_URXH); | |
303 | ||
304 | if (port->flags & UPF_CONS_FLOW) { | |
305 | int txe = s3c24xx_serial_txempty_nofifo(port); | |
306 | ||
307 | if (rx_enabled(port)) { | |
308 | if (!txe) { | |
309 | rx_enabled(port) = 0; | |
310 | continue; | |
311 | } | |
312 | } else { | |
313 | if (txe) { | |
314 | ufcon |= S3C2410_UFCON_RESETRX; | |
315 | wr_regl(port, S3C2410_UFCON, ufcon); | |
316 | rx_enabled(port) = 1; | |
317 | goto out; | |
318 | } | |
319 | continue; | |
320 | } | |
321 | } | |
322 | ||
323 | /* insert the character into the buffer */ | |
324 | ||
325 | flag = TTY_NORMAL; | |
326 | port->icount.rx++; | |
327 | ||
45849282 | 328 | if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) { |
1da177e4 LT |
329 | dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n", |
330 | ch, uerstat); | |
331 | ||
332 | /* check for break */ | |
333 | if (uerstat & S3C2410_UERSTAT_BREAK) { | |
334 | dbg("break!\n"); | |
335 | port->icount.brk++; | |
336 | if (uart_handle_break(port)) | |
337 | goto ignore_char; | |
338 | } | |
339 | ||
340 | if (uerstat & S3C2410_UERSTAT_FRAME) | |
341 | port->icount.frame++; | |
342 | if (uerstat & S3C2410_UERSTAT_OVERRUN) | |
343 | port->icount.overrun++; | |
344 | ||
345 | uerstat &= port->read_status_mask; | |
346 | ||
347 | if (uerstat & S3C2410_UERSTAT_BREAK) | |
348 | flag = TTY_BREAK; | |
349 | else if (uerstat & S3C2410_UERSTAT_PARITY) | |
350 | flag = TTY_PARITY; | |
351 | else if (uerstat & ( S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_OVERRUN)) | |
352 | flag = TTY_FRAME; | |
353 | } | |
354 | ||
7d12e780 | 355 | if (uart_handle_sysrq_char(port, ch)) |
1da177e4 LT |
356 | goto ignore_char; |
357 | ||
05ab3014 | 358 | uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN, ch, flag); |
1da177e4 LT |
359 | |
360 | ignore_char: | |
361 | continue; | |
362 | } | |
363 | tty_flip_buffer_push(tty); | |
364 | ||
365 | out: | |
366 | return IRQ_HANDLED; | |
367 | } | |
368 | ||
7d12e780 | 369 | static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id) |
1da177e4 LT |
370 | { |
371 | struct s3c24xx_uart_port *ourport = id; | |
372 | struct uart_port *port = &ourport->port; | |
373 | struct circ_buf *xmit = &port->info->xmit; | |
374 | int count = 256; | |
375 | ||
376 | if (port->x_char) { | |
377 | wr_regb(port, S3C2410_UTXH, port->x_char); | |
378 | port->icount.tx++; | |
379 | port->x_char = 0; | |
380 | goto out; | |
381 | } | |
382 | ||
383 | /* if there isnt anything more to transmit, or the uart is now | |
384 | * stopped, disable the uart and exit | |
385 | */ | |
386 | ||
387 | if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { | |
b129a8cc | 388 | s3c24xx_serial_stop_tx(port); |
1da177e4 LT |
389 | goto out; |
390 | } | |
391 | ||
392 | /* try and drain the buffer... */ | |
393 | ||
394 | while (!uart_circ_empty(xmit) && count-- > 0) { | |
395 | if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull) | |
396 | break; | |
397 | ||
398 | wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]); | |
399 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
400 | port->icount.tx++; | |
401 | } | |
402 | ||
403 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
404 | uart_write_wakeup(port); | |
405 | ||
406 | if (uart_circ_empty(xmit)) | |
b129a8cc | 407 | s3c24xx_serial_stop_tx(port); |
1da177e4 LT |
408 | |
409 | out: | |
410 | return IRQ_HANDLED; | |
411 | } | |
412 | ||
413 | static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port) | |
414 | { | |
415 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
416 | unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT); | |
417 | unsigned long ufcon = rd_regl(port, S3C2410_UFCON); | |
418 | ||
419 | if (ufcon & S3C2410_UFCON_FIFOMODE) { | |
420 | if ((ufstat & info->tx_fifomask) != 0 || | |
421 | (ufstat & info->tx_fifofull)) | |
422 | return 0; | |
423 | ||
424 | return 1; | |
425 | } | |
426 | ||
427 | return s3c24xx_serial_txempty_nofifo(port); | |
428 | } | |
429 | ||
430 | /* no modem control lines */ | |
431 | static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port) | |
432 | { | |
433 | unsigned int umstat = rd_regb(port,S3C2410_UMSTAT); | |
434 | ||
435 | if (umstat & S3C2410_UMSTAT_CTS) | |
436 | return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; | |
437 | else | |
438 | return TIOCM_CAR | TIOCM_DSR; | |
439 | } | |
440 | ||
441 | static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
442 | { | |
443 | /* todo - possibly remove AFC and do manual CTS */ | |
444 | } | |
445 | ||
446 | static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state) | |
447 | { | |
448 | unsigned long flags; | |
449 | unsigned int ucon; | |
450 | ||
451 | spin_lock_irqsave(&port->lock, flags); | |
452 | ||
453 | ucon = rd_regl(port, S3C2410_UCON); | |
454 | ||
455 | if (break_state) | |
456 | ucon |= S3C2410_UCON_SBREAK; | |
457 | else | |
458 | ucon &= ~S3C2410_UCON_SBREAK; | |
459 | ||
460 | wr_regl(port, S3C2410_UCON, ucon); | |
461 | ||
462 | spin_unlock_irqrestore(&port->lock, flags); | |
463 | } | |
464 | ||
465 | static void s3c24xx_serial_shutdown(struct uart_port *port) | |
466 | { | |
467 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
468 | ||
469 | if (ourport->tx_claimed) { | |
470 | free_irq(TX_IRQ(port), ourport); | |
471 | tx_enabled(port) = 0; | |
472 | ourport->tx_claimed = 0; | |
473 | } | |
474 | ||
475 | if (ourport->rx_claimed) { | |
476 | free_irq(RX_IRQ(port), ourport); | |
477 | ourport->rx_claimed = 0; | |
478 | rx_enabled(port) = 0; | |
479 | } | |
480 | } | |
481 | ||
482 | ||
483 | static int s3c24xx_serial_startup(struct uart_port *port) | |
484 | { | |
485 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
1da177e4 LT |
486 | int ret; |
487 | ||
488 | dbg("s3c24xx_serial_startup: port=%p (%08lx,%p)\n", | |
489 | port->mapbase, port->membase); | |
490 | ||
1da177e4 LT |
491 | rx_enabled(port) = 1; |
492 | ||
493 | ret = request_irq(RX_IRQ(port), | |
494 | s3c24xx_serial_rx_chars, 0, | |
495 | s3c24xx_serial_portname(port), ourport); | |
496 | ||
497 | if (ret != 0) { | |
498 | printk(KERN_ERR "cannot get irq %d\n", RX_IRQ(port)); | |
499 | return ret; | |
500 | } | |
501 | ||
502 | ourport->rx_claimed = 1; | |
503 | ||
504 | dbg("requesting tx irq...\n"); | |
505 | ||
506 | tx_enabled(port) = 1; | |
507 | ||
508 | ret = request_irq(TX_IRQ(port), | |
509 | s3c24xx_serial_tx_chars, 0, | |
510 | s3c24xx_serial_portname(port), ourport); | |
511 | ||
512 | if (ret) { | |
513 | printk(KERN_ERR "cannot get irq %d\n", TX_IRQ(port)); | |
514 | goto err; | |
515 | } | |
516 | ||
517 | ourport->tx_claimed = 1; | |
518 | ||
519 | dbg("s3c24xx_serial_startup ok\n"); | |
520 | ||
521 | /* the port reset code should have done the correct | |
522 | * register setup for the port controls */ | |
523 | ||
1da177e4 LT |
524 | return ret; |
525 | ||
526 | err: | |
527 | s3c24xx_serial_shutdown(port); | |
1da177e4 LT |
528 | return ret; |
529 | } | |
530 | ||
531 | /* power power management control */ | |
532 | ||
533 | static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level, | |
534 | unsigned int old) | |
535 | { | |
536 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
537 | ||
538 | switch (level) { | |
539 | case 3: | |
540 | if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL) | |
541 | clk_disable(ourport->baudclk); | |
542 | ||
543 | clk_disable(ourport->clk); | |
544 | break; | |
545 | ||
546 | case 0: | |
547 | clk_enable(ourport->clk); | |
548 | ||
549 | if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL) | |
550 | clk_enable(ourport->baudclk); | |
551 | ||
552 | break; | |
553 | default: | |
554 | printk(KERN_ERR "s3c24xx_serial: unknown pm %d\n", level); | |
555 | } | |
556 | } | |
557 | ||
558 | /* baud rate calculation | |
559 | * | |
560 | * The UARTs on the S3C2410/S3C2440 can take their clocks from a number | |
561 | * of different sources, including the peripheral clock ("pclk") and an | |
562 | * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk") | |
563 | * with a programmable extra divisor. | |
564 | * | |
565 | * The following code goes through the clock sources, and calculates the | |
566 | * baud clocks (and the resultant actual baud rates) and then tries to | |
567 | * pick the closest one and select that. | |
568 | * | |
569 | */ | |
570 | ||
571 | ||
572 | #define MAX_CLKS (8) | |
573 | ||
574 | static struct s3c24xx_uart_clksrc tmp_clksrc = { | |
575 | .name = "pclk", | |
576 | .min_baud = 0, | |
577 | .max_baud = 0, | |
578 | .divisor = 1, | |
579 | }; | |
580 | ||
581 | static inline int | |
582 | s3c24xx_serial_getsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c) | |
583 | { | |
584 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
585 | ||
586 | return (info->get_clksrc)(port, c); | |
587 | } | |
588 | ||
589 | static inline int | |
590 | s3c24xx_serial_setsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c) | |
591 | { | |
592 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
593 | ||
594 | return (info->set_clksrc)(port, c); | |
595 | } | |
596 | ||
597 | struct baud_calc { | |
598 | struct s3c24xx_uart_clksrc *clksrc; | |
599 | unsigned int calc; | |
600 | unsigned int quot; | |
601 | struct clk *src; | |
602 | }; | |
603 | ||
604 | static int s3c24xx_serial_calcbaud(struct baud_calc *calc, | |
605 | struct uart_port *port, | |
606 | struct s3c24xx_uart_clksrc *clksrc, | |
607 | unsigned int baud) | |
608 | { | |
609 | unsigned long rate; | |
610 | ||
611 | calc->src = clk_get(port->dev, clksrc->name); | |
612 | if (calc->src == NULL || IS_ERR(calc->src)) | |
613 | return 0; | |
614 | ||
615 | rate = clk_get_rate(calc->src); | |
616 | rate /= clksrc->divisor; | |
617 | ||
618 | calc->clksrc = clksrc; | |
619 | calc->quot = (rate + (8 * baud)) / (16 * baud); | |
620 | calc->calc = (rate / (calc->quot * 16)); | |
621 | ||
622 | calc->quot--; | |
623 | return 1; | |
624 | } | |
625 | ||
626 | static unsigned int s3c24xx_serial_getclk(struct uart_port *port, | |
627 | struct s3c24xx_uart_clksrc **clksrc, | |
628 | struct clk **clk, | |
629 | unsigned int baud) | |
630 | { | |
631 | struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port); | |
632 | struct s3c24xx_uart_clksrc *clkp; | |
633 | struct baud_calc res[MAX_CLKS]; | |
634 | struct baud_calc *resptr, *best, *sptr; | |
635 | int i; | |
636 | ||
637 | clkp = cfg->clocks; | |
638 | best = NULL; | |
639 | ||
640 | if (cfg->clocks_size < 2) { | |
641 | if (cfg->clocks_size == 0) | |
642 | clkp = &tmp_clksrc; | |
643 | ||
644 | /* check to see if we're sourcing fclk, and if so we're | |
645 | * going to have to update the clock source | |
646 | */ | |
647 | ||
648 | if (strcmp(clkp->name, "fclk") == 0) { | |
649 | struct s3c24xx_uart_clksrc src; | |
650 | ||
651 | s3c24xx_serial_getsource(port, &src); | |
652 | ||
653 | /* check that the port already using fclk, and if | |
654 | * not, then re-select fclk | |
655 | */ | |
656 | ||
657 | if (strcmp(src.name, clkp->name) == 0) { | |
658 | s3c24xx_serial_setsource(port, clkp); | |
659 | s3c24xx_serial_getsource(port, &src); | |
660 | } | |
661 | ||
662 | clkp->divisor = src.divisor; | |
663 | } | |
664 | ||
665 | s3c24xx_serial_calcbaud(res, port, clkp, baud); | |
666 | best = res; | |
667 | resptr = best + 1; | |
668 | } else { | |
669 | resptr = res; | |
670 | ||
671 | for (i = 0; i < cfg->clocks_size; i++, clkp++) { | |
672 | if (s3c24xx_serial_calcbaud(resptr, port, clkp, baud)) | |
673 | resptr++; | |
674 | } | |
675 | } | |
676 | ||
677 | /* ok, we now need to select the best clock we found */ | |
678 | ||
679 | if (!best) { | |
680 | unsigned int deviation = (1<<30)|((1<<30)-1); | |
681 | int calc_deviation; | |
682 | ||
683 | for (sptr = res; sptr < resptr; sptr++) { | |
684 | printk(KERN_DEBUG | |
685 | "found clk %p (%s) quot %d, calc %d\n", | |
686 | sptr->clksrc, sptr->clksrc->name, | |
687 | sptr->quot, sptr->calc); | |
688 | ||
689 | calc_deviation = baud - sptr->calc; | |
690 | if (calc_deviation < 0) | |
691 | calc_deviation = -calc_deviation; | |
692 | ||
693 | if (calc_deviation < deviation) { | |
694 | best = sptr; | |
695 | deviation = calc_deviation; | |
696 | } | |
697 | } | |
698 | ||
699 | printk(KERN_DEBUG "best %p (deviation %d)\n", best, deviation); | |
700 | } | |
701 | ||
702 | printk(KERN_DEBUG "selected clock %p (%s) quot %d, calc %d\n", | |
703 | best->clksrc, best->clksrc->name, best->quot, best->calc); | |
704 | ||
705 | /* store results to pass back */ | |
706 | ||
707 | *clksrc = best->clksrc; | |
708 | *clk = best->src; | |
709 | ||
710 | return best->quot; | |
711 | } | |
712 | ||
713 | static void s3c24xx_serial_set_termios(struct uart_port *port, | |
606d099c AC |
714 | struct ktermios *termios, |
715 | struct ktermios *old) | |
1da177e4 LT |
716 | { |
717 | struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port); | |
718 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
f04da5de BD |
719 | struct s3c24xx_uart_clksrc *clksrc = NULL; |
720 | struct clk *clk = NULL; | |
1da177e4 LT |
721 | unsigned long flags; |
722 | unsigned int baud, quot; | |
723 | unsigned int ulcon; | |
724 | unsigned int umcon; | |
725 | ||
726 | /* | |
727 | * We don't support modem control lines. | |
728 | */ | |
729 | termios->c_cflag &= ~(HUPCL | CMSPAR); | |
730 | termios->c_cflag |= CLOCAL; | |
731 | ||
732 | /* | |
733 | * Ask the core to calculate the divisor for us. | |
734 | */ | |
735 | ||
736 | baud = uart_get_baud_rate(port, termios, old, 0, 115200*8); | |
737 | ||
738 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) | |
739 | quot = port->custom_divisor; | |
740 | else | |
741 | quot = s3c24xx_serial_getclk(port, &clksrc, &clk, baud); | |
742 | ||
743 | /* check to see if we need to change clock source */ | |
744 | ||
745 | if (ourport->clksrc != clksrc || ourport->baudclk != clk) { | |
746 | s3c24xx_serial_setsource(port, clksrc); | |
747 | ||
748 | if (ourport->baudclk != NULL && !IS_ERR(ourport->baudclk)) { | |
749 | clk_disable(ourport->baudclk); | |
1da177e4 LT |
750 | ourport->baudclk = NULL; |
751 | } | |
752 | ||
1da177e4 LT |
753 | clk_enable(clk); |
754 | ||
755 | ourport->clksrc = clksrc; | |
756 | ourport->baudclk = clk; | |
757 | } | |
758 | ||
759 | switch (termios->c_cflag & CSIZE) { | |
760 | case CS5: | |
761 | dbg("config: 5bits/char\n"); | |
762 | ulcon = S3C2410_LCON_CS5; | |
763 | break; | |
764 | case CS6: | |
765 | dbg("config: 6bits/char\n"); | |
766 | ulcon = S3C2410_LCON_CS6; | |
767 | break; | |
768 | case CS7: | |
769 | dbg("config: 7bits/char\n"); | |
770 | ulcon = S3C2410_LCON_CS7; | |
771 | break; | |
772 | case CS8: | |
773 | default: | |
774 | dbg("config: 8bits/char\n"); | |
775 | ulcon = S3C2410_LCON_CS8; | |
776 | break; | |
777 | } | |
778 | ||
779 | /* preserve original lcon IR settings */ | |
780 | ulcon |= (cfg->ulcon & S3C2410_LCON_IRM); | |
781 | ||
782 | if (termios->c_cflag & CSTOPB) | |
783 | ulcon |= S3C2410_LCON_STOPB; | |
784 | ||
785 | umcon = (termios->c_cflag & CRTSCTS) ? S3C2410_UMCOM_AFC : 0; | |
786 | ||
787 | if (termios->c_cflag & PARENB) { | |
788 | if (termios->c_cflag & PARODD) | |
789 | ulcon |= S3C2410_LCON_PODD; | |
790 | else | |
791 | ulcon |= S3C2410_LCON_PEVEN; | |
792 | } else { | |
793 | ulcon |= S3C2410_LCON_PNONE; | |
794 | } | |
795 | ||
796 | spin_lock_irqsave(&port->lock, flags); | |
797 | ||
798 | dbg("setting ulcon to %08x, brddiv to %d\n", ulcon, quot); | |
799 | ||
800 | wr_regl(port, S3C2410_ULCON, ulcon); | |
801 | wr_regl(port, S3C2410_UBRDIV, quot); | |
802 | wr_regl(port, S3C2410_UMCON, umcon); | |
803 | ||
804 | dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n", | |
805 | rd_regl(port, S3C2410_ULCON), | |
806 | rd_regl(port, S3C2410_UCON), | |
807 | rd_regl(port, S3C2410_UFCON)); | |
808 | ||
809 | /* | |
810 | * Update the per-port timeout. | |
811 | */ | |
812 | uart_update_timeout(port, termios->c_cflag, baud); | |
813 | ||
814 | /* | |
815 | * Which character status flags are we interested in? | |
816 | */ | |
817 | port->read_status_mask = S3C2410_UERSTAT_OVERRUN; | |
818 | if (termios->c_iflag & INPCK) | |
819 | port->read_status_mask |= S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_PARITY; | |
820 | ||
821 | /* | |
822 | * Which character status flags should we ignore? | |
823 | */ | |
824 | port->ignore_status_mask = 0; | |
825 | if (termios->c_iflag & IGNPAR) | |
826 | port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN; | |
827 | if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR) | |
828 | port->ignore_status_mask |= S3C2410_UERSTAT_FRAME; | |
829 | ||
830 | /* | |
831 | * Ignore all characters if CREAD is not set. | |
832 | */ | |
833 | if ((termios->c_cflag & CREAD) == 0) | |
834 | port->ignore_status_mask |= RXSTAT_DUMMY_READ; | |
835 | ||
836 | spin_unlock_irqrestore(&port->lock, flags); | |
837 | } | |
838 | ||
839 | static const char *s3c24xx_serial_type(struct uart_port *port) | |
840 | { | |
841 | switch (port->type) { | |
842 | case PORT_S3C2410: | |
843 | return "S3C2410"; | |
844 | case PORT_S3C2440: | |
845 | return "S3C2440"; | |
73e55cb3 BD |
846 | case PORT_S3C2412: |
847 | return "S3C2412"; | |
1da177e4 LT |
848 | default: |
849 | return NULL; | |
850 | } | |
851 | } | |
852 | ||
853 | #define MAP_SIZE (0x100) | |
854 | ||
855 | static void s3c24xx_serial_release_port(struct uart_port *port) | |
856 | { | |
857 | release_mem_region(port->mapbase, MAP_SIZE); | |
858 | } | |
859 | ||
860 | static int s3c24xx_serial_request_port(struct uart_port *port) | |
861 | { | |
d9dc5804 | 862 | const char *name = s3c24xx_serial_portname(port); |
1da177e4 LT |
863 | return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY; |
864 | } | |
865 | ||
866 | static void s3c24xx_serial_config_port(struct uart_port *port, int flags) | |
867 | { | |
868 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
869 | ||
870 | if (flags & UART_CONFIG_TYPE && | |
871 | s3c24xx_serial_request_port(port) == 0) | |
872 | port->type = info->type; | |
873 | } | |
874 | ||
875 | /* | |
876 | * verify the new serial_struct (for TIOCSSERIAL). | |
877 | */ | |
878 | static int | |
879 | s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser) | |
880 | { | |
881 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
882 | ||
883 | if (ser->type != PORT_UNKNOWN && ser->type != info->type) | |
884 | return -EINVAL; | |
885 | ||
886 | return 0; | |
887 | } | |
888 | ||
889 | ||
890 | #ifdef CONFIG_SERIAL_S3C2410_CONSOLE | |
891 | ||
892 | static struct console s3c24xx_serial_console; | |
893 | ||
894 | #define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console | |
895 | #else | |
896 | #define S3C24XX_SERIAL_CONSOLE NULL | |
897 | #endif | |
898 | ||
899 | static struct uart_ops s3c24xx_serial_ops = { | |
900 | .pm = s3c24xx_serial_pm, | |
901 | .tx_empty = s3c24xx_serial_tx_empty, | |
902 | .get_mctrl = s3c24xx_serial_get_mctrl, | |
903 | .set_mctrl = s3c24xx_serial_set_mctrl, | |
904 | .stop_tx = s3c24xx_serial_stop_tx, | |
905 | .start_tx = s3c24xx_serial_start_tx, | |
906 | .stop_rx = s3c24xx_serial_stop_rx, | |
907 | .enable_ms = s3c24xx_serial_enable_ms, | |
908 | .break_ctl = s3c24xx_serial_break_ctl, | |
909 | .startup = s3c24xx_serial_startup, | |
910 | .shutdown = s3c24xx_serial_shutdown, | |
911 | .set_termios = s3c24xx_serial_set_termios, | |
912 | .type = s3c24xx_serial_type, | |
913 | .release_port = s3c24xx_serial_release_port, | |
914 | .request_port = s3c24xx_serial_request_port, | |
915 | .config_port = s3c24xx_serial_config_port, | |
916 | .verify_port = s3c24xx_serial_verify_port, | |
917 | }; | |
918 | ||
919 | ||
920 | static struct uart_driver s3c24xx_uart_drv = { | |
921 | .owner = THIS_MODULE, | |
922 | .dev_name = "s3c2410_serial", | |
923 | .nr = 3, | |
924 | .cons = S3C24XX_SERIAL_CONSOLE, | |
925 | .driver_name = S3C24XX_SERIAL_NAME, | |
1da177e4 LT |
926 | .major = S3C24XX_SERIAL_MAJOR, |
927 | .minor = S3C24XX_SERIAL_MINOR, | |
928 | }; | |
929 | ||
930 | static struct s3c24xx_uart_port s3c24xx_serial_ports[NR_PORTS] = { | |
931 | [0] = { | |
932 | .port = { | |
076fa0fa | 933 | .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[0].port.lock), |
1da177e4 LT |
934 | .iotype = UPIO_MEM, |
935 | .irq = IRQ_S3CUART_RX0, | |
936 | .uartclk = 0, | |
937 | .fifosize = 16, | |
938 | .ops = &s3c24xx_serial_ops, | |
939 | .flags = UPF_BOOT_AUTOCONF, | |
940 | .line = 0, | |
941 | } | |
942 | }, | |
943 | [1] = { | |
944 | .port = { | |
076fa0fa | 945 | .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[1].port.lock), |
1da177e4 LT |
946 | .iotype = UPIO_MEM, |
947 | .irq = IRQ_S3CUART_RX1, | |
948 | .uartclk = 0, | |
949 | .fifosize = 16, | |
950 | .ops = &s3c24xx_serial_ops, | |
951 | .flags = UPF_BOOT_AUTOCONF, | |
952 | .line = 1, | |
953 | } | |
954 | }, | |
955 | #if NR_PORTS > 2 | |
956 | ||
957 | [2] = { | |
958 | .port = { | |
076fa0fa | 959 | .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[2].port.lock), |
1da177e4 LT |
960 | .iotype = UPIO_MEM, |
961 | .irq = IRQ_S3CUART_RX2, | |
962 | .uartclk = 0, | |
963 | .fifosize = 16, | |
964 | .ops = &s3c24xx_serial_ops, | |
965 | .flags = UPF_BOOT_AUTOCONF, | |
966 | .line = 2, | |
967 | } | |
968 | } | |
969 | #endif | |
970 | }; | |
971 | ||
972 | /* s3c24xx_serial_resetport | |
973 | * | |
974 | * wrapper to call the specific reset for this port (reset the fifos | |
975 | * and the settings) | |
976 | */ | |
977 | ||
978 | static inline int s3c24xx_serial_resetport(struct uart_port * port, | |
979 | struct s3c2410_uartcfg *cfg) | |
980 | { | |
981 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
982 | ||
983 | return (info->reset_port)(port, cfg); | |
984 | } | |
985 | ||
986 | /* s3c24xx_serial_init_port | |
987 | * | |
988 | * initialise a single serial port from the platform device given | |
989 | */ | |
990 | ||
991 | static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport, | |
992 | struct s3c24xx_uart_info *info, | |
993 | struct platform_device *platdev) | |
994 | { | |
995 | struct uart_port *port = &ourport->port; | |
996 | struct s3c2410_uartcfg *cfg; | |
997 | struct resource *res; | |
681587c5 | 998 | int ret; |
1da177e4 LT |
999 | |
1000 | dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev); | |
1001 | ||
1002 | if (platdev == NULL) | |
1003 | return -ENODEV; | |
1004 | ||
1005 | cfg = s3c24xx_dev_to_cfg(&platdev->dev); | |
1006 | ||
1007 | if (port->mapbase != 0) | |
1008 | return 0; | |
1009 | ||
1010 | if (cfg->hwport > 3) | |
1011 | return -EINVAL; | |
1012 | ||
1013 | /* setup info for port */ | |
1014 | port->dev = &platdev->dev; | |
1015 | ourport->info = info; | |
1016 | ||
1017 | /* copy the info in from provided structure */ | |
1018 | ourport->port.fifosize = info->fifosize; | |
1019 | ||
1020 | dbg("s3c24xx_serial_init_port: %p (hw %d)...\n", port, cfg->hwport); | |
1021 | ||
1022 | port->uartclk = 1; | |
1023 | ||
1024 | if (cfg->uart_flags & UPF_CONS_FLOW) { | |
1025 | dbg("s3c24xx_serial_init_port: enabling flow control\n"); | |
1026 | port->flags |= UPF_CONS_FLOW; | |
1027 | } | |
1028 | ||
1029 | /* sort our the physical and virtual addresses for each UART */ | |
1030 | ||
1031 | res = platform_get_resource(platdev, IORESOURCE_MEM, 0); | |
1032 | if (res == NULL) { | |
1033 | printk(KERN_ERR "failed to find memory resource for uart\n"); | |
1034 | return -EINVAL; | |
1035 | } | |
1036 | ||
1037 | dbg("resource %p (%lx..%lx)\n", res, res->start, res->end); | |
1038 | ||
1039 | port->mapbase = res->start; | |
0367a8d3 | 1040 | port->membase = S3C24XX_VA_UART + (res->start - S3C24XX_PA_UART); |
681587c5 RK |
1041 | ret = platform_get_irq(platdev, 0); |
1042 | if (ret < 0) | |
48944738 | 1043 | port->irq = 0; |
681587c5 RK |
1044 | else |
1045 | port->irq = ret; | |
1da177e4 LT |
1046 | |
1047 | ourport->clk = clk_get(&platdev->dev, "uart"); | |
1048 | ||
1da177e4 LT |
1049 | dbg("port: map=%08x, mem=%08x, irq=%d, clock=%ld\n", |
1050 | port->mapbase, port->membase, port->irq, port->uartclk); | |
1051 | ||
1052 | /* reset the fifos (and setup the uart) */ | |
1053 | s3c24xx_serial_resetport(port, cfg); | |
1054 | return 0; | |
1055 | } | |
1056 | ||
1057 | /* Device driver serial port probe */ | |
1058 | ||
1059 | static int probe_index = 0; | |
1060 | ||
3ae5eaec | 1061 | static int s3c24xx_serial_probe(struct platform_device *dev, |
17efa644 | 1062 | struct s3c24xx_uart_info *info) |
1da177e4 LT |
1063 | { |
1064 | struct s3c24xx_uart_port *ourport; | |
1da177e4 LT |
1065 | int ret; |
1066 | ||
3ae5eaec | 1067 | dbg("s3c24xx_serial_probe(%p, %p) %d\n", dev, info, probe_index); |
1da177e4 LT |
1068 | |
1069 | ourport = &s3c24xx_serial_ports[probe_index]; | |
1070 | probe_index++; | |
1071 | ||
71cc2c21 | 1072 | dbg("%s: initialising port %p...\n", __func__, ourport); |
1da177e4 LT |
1073 | |
1074 | ret = s3c24xx_serial_init_port(ourport, info, dev); | |
1075 | if (ret < 0) | |
1076 | goto probe_err; | |
1077 | ||
71cc2c21 | 1078 | dbg("%s: adding port\n", __func__); |
1da177e4 | 1079 | uart_add_one_port(&s3c24xx_uart_drv, &ourport->port); |
3ae5eaec | 1080 | platform_set_drvdata(dev, &ourport->port); |
1da177e4 LT |
1081 | |
1082 | return 0; | |
1083 | ||
1084 | probe_err: | |
1085 | return ret; | |
1086 | } | |
1087 | ||
3ae5eaec | 1088 | static int s3c24xx_serial_remove(struct platform_device *dev) |
1da177e4 | 1089 | { |
3ae5eaec | 1090 | struct uart_port *port = s3c24xx_dev_to_port(&dev->dev); |
1da177e4 LT |
1091 | |
1092 | if (port) | |
1093 | uart_remove_one_port(&s3c24xx_uart_drv, port); | |
1094 | ||
1095 | return 0; | |
1096 | } | |
1097 | ||
1098 | /* UART power management code */ | |
1099 | ||
1100 | #ifdef CONFIG_PM | |
1101 | ||
3ae5eaec | 1102 | static int s3c24xx_serial_suspend(struct platform_device *dev, pm_message_t state) |
1da177e4 | 1103 | { |
3ae5eaec | 1104 | struct uart_port *port = s3c24xx_dev_to_port(&dev->dev); |
1da177e4 | 1105 | |
9480e307 | 1106 | if (port) |
1da177e4 LT |
1107 | uart_suspend_port(&s3c24xx_uart_drv, port); |
1108 | ||
1109 | return 0; | |
1110 | } | |
1111 | ||
3ae5eaec | 1112 | static int s3c24xx_serial_resume(struct platform_device *dev) |
1da177e4 | 1113 | { |
3ae5eaec | 1114 | struct uart_port *port = s3c24xx_dev_to_port(&dev->dev); |
1da177e4 LT |
1115 | struct s3c24xx_uart_port *ourport = to_ourport(port); |
1116 | ||
9480e307 | 1117 | if (port) { |
1da177e4 LT |
1118 | clk_enable(ourport->clk); |
1119 | s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port)); | |
1120 | clk_disable(ourport->clk); | |
1121 | ||
1122 | uart_resume_port(&s3c24xx_uart_drv, port); | |
1123 | } | |
1124 | ||
1125 | return 0; | |
1126 | } | |
1127 | ||
1128 | #else | |
1129 | #define s3c24xx_serial_suspend NULL | |
1130 | #define s3c24xx_serial_resume NULL | |
1131 | #endif | |
1132 | ||
3ae5eaec | 1133 | static int s3c24xx_serial_init(struct platform_driver *drv, |
17efa644 | 1134 | struct s3c24xx_uart_info *info) |
1da177e4 LT |
1135 | { |
1136 | dbg("s3c24xx_serial_init(%p,%p)\n", drv, info); | |
3ae5eaec | 1137 | return platform_driver_register(drv); |
1da177e4 LT |
1138 | } |
1139 | ||
1140 | ||
1141 | /* now comes the code to initialise either the s3c2410 or s3c2440 serial | |
1142 | * port information | |
1143 | */ | |
1144 | ||
1145 | /* cpu specific variations on the serial port support */ | |
1146 | ||
1147 | #ifdef CONFIG_CPU_S3C2400 | |
1148 | ||
1149 | static int s3c2400_serial_getsource(struct uart_port *port, | |
1150 | struct s3c24xx_uart_clksrc *clk) | |
1151 | { | |
1152 | clk->divisor = 1; | |
1153 | clk->name = "pclk"; | |
1154 | ||
1155 | return 0; | |
1156 | } | |
1157 | ||
1158 | static int s3c2400_serial_setsource(struct uart_port *port, | |
1159 | struct s3c24xx_uart_clksrc *clk) | |
1160 | { | |
1161 | return 0; | |
1162 | } | |
1163 | ||
1164 | static int s3c2400_serial_resetport(struct uart_port *port, | |
1165 | struct s3c2410_uartcfg *cfg) | |
1166 | { | |
1167 | dbg("s3c2400_serial_resetport: port=%p (%08lx), cfg=%p\n", | |
1168 | port, port->mapbase, cfg); | |
1169 | ||
1170 | wr_regl(port, S3C2410_UCON, cfg->ucon); | |
1171 | wr_regl(port, S3C2410_ULCON, cfg->ulcon); | |
1172 | ||
1173 | /* reset both fifos */ | |
1174 | ||
1175 | wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH); | |
1176 | wr_regl(port, S3C2410_UFCON, cfg->ufcon); | |
1177 | ||
1178 | return 0; | |
1179 | } | |
1180 | ||
1181 | static struct s3c24xx_uart_info s3c2400_uart_inf = { | |
1182 | .name = "Samsung S3C2400 UART", | |
1183 | .type = PORT_S3C2400, | |
1184 | .fifosize = 16, | |
1185 | .rx_fifomask = S3C2410_UFSTAT_RXMASK, | |
1186 | .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT, | |
1187 | .rx_fifofull = S3C2410_UFSTAT_RXFULL, | |
1188 | .tx_fifofull = S3C2410_UFSTAT_TXFULL, | |
1189 | .tx_fifomask = S3C2410_UFSTAT_TXMASK, | |
1190 | .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT, | |
1191 | .get_clksrc = s3c2400_serial_getsource, | |
1192 | .set_clksrc = s3c2400_serial_setsource, | |
1193 | .reset_port = s3c2400_serial_resetport, | |
1194 | }; | |
1195 | ||
3ae5eaec | 1196 | static int s3c2400_serial_probe(struct platform_device *dev) |
1da177e4 LT |
1197 | { |
1198 | return s3c24xx_serial_probe(dev, &s3c2400_uart_inf); | |
1199 | } | |
1200 | ||
3ae5eaec | 1201 | static struct platform_driver s3c2400_serial_drv = { |
1da177e4 LT |
1202 | .probe = s3c2400_serial_probe, |
1203 | .remove = s3c24xx_serial_remove, | |
1204 | .suspend = s3c24xx_serial_suspend, | |
1205 | .resume = s3c24xx_serial_resume, | |
3ae5eaec RK |
1206 | .driver = { |
1207 | .name = "s3c2400-uart", | |
1208 | .owner = THIS_MODULE, | |
1209 | }, | |
1da177e4 LT |
1210 | }; |
1211 | ||
1212 | static inline int s3c2400_serial_init(void) | |
1213 | { | |
1214 | return s3c24xx_serial_init(&s3c2400_serial_drv, &s3c2400_uart_inf); | |
1215 | } | |
1216 | ||
1217 | static inline void s3c2400_serial_exit(void) | |
1218 | { | |
3ae5eaec | 1219 | platform_driver_unregister(&s3c2400_serial_drv); |
1da177e4 LT |
1220 | } |
1221 | ||
1222 | #define s3c2400_uart_inf_at &s3c2400_uart_inf | |
1223 | #else | |
1224 | ||
1225 | static inline int s3c2400_serial_init(void) | |
1226 | { | |
1227 | return 0; | |
1228 | } | |
1229 | ||
1230 | static inline void s3c2400_serial_exit(void) | |
1231 | { | |
1232 | } | |
1233 | ||
1234 | #define s3c2400_uart_inf_at NULL | |
1235 | ||
1236 | #endif /* CONFIG_CPU_S3C2400 */ | |
1237 | ||
1238 | /* S3C2410 support */ | |
1239 | ||
1240 | #ifdef CONFIG_CPU_S3C2410 | |
1241 | ||
1242 | static int s3c2410_serial_setsource(struct uart_port *port, | |
1243 | struct s3c24xx_uart_clksrc *clk) | |
1244 | { | |
1245 | unsigned long ucon = rd_regl(port, S3C2410_UCON); | |
1246 | ||
1247 | if (strcmp(clk->name, "uclk") == 0) | |
1248 | ucon |= S3C2410_UCON_UCLK; | |
1249 | else | |
1250 | ucon &= ~S3C2410_UCON_UCLK; | |
1251 | ||
1252 | wr_regl(port, S3C2410_UCON, ucon); | |
1253 | return 0; | |
1254 | } | |
1255 | ||
1256 | static int s3c2410_serial_getsource(struct uart_port *port, | |
1257 | struct s3c24xx_uart_clksrc *clk) | |
1258 | { | |
1259 | unsigned long ucon = rd_regl(port, S3C2410_UCON); | |
1260 | ||
1261 | clk->divisor = 1; | |
1262 | clk->name = (ucon & S3C2410_UCON_UCLK) ? "uclk" : "pclk"; | |
1263 | ||
1264 | return 0; | |
1265 | } | |
1266 | ||
1267 | static int s3c2410_serial_resetport(struct uart_port *port, | |
1268 | struct s3c2410_uartcfg *cfg) | |
1269 | { | |
1270 | dbg("s3c2410_serial_resetport: port=%p (%08lx), cfg=%p\n", | |
1271 | port, port->mapbase, cfg); | |
1272 | ||
1273 | wr_regl(port, S3C2410_UCON, cfg->ucon); | |
1274 | wr_regl(port, S3C2410_ULCON, cfg->ulcon); | |
1275 | ||
1276 | /* reset both fifos */ | |
1277 | ||
1278 | wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH); | |
1279 | wr_regl(port, S3C2410_UFCON, cfg->ufcon); | |
1280 | ||
1281 | return 0; | |
1282 | } | |
1283 | ||
1284 | static struct s3c24xx_uart_info s3c2410_uart_inf = { | |
1285 | .name = "Samsung S3C2410 UART", | |
1286 | .type = PORT_S3C2410, | |
1287 | .fifosize = 16, | |
1288 | .rx_fifomask = S3C2410_UFSTAT_RXMASK, | |
1289 | .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT, | |
1290 | .rx_fifofull = S3C2410_UFSTAT_RXFULL, | |
1291 | .tx_fifofull = S3C2410_UFSTAT_TXFULL, | |
1292 | .tx_fifomask = S3C2410_UFSTAT_TXMASK, | |
1293 | .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT, | |
1294 | .get_clksrc = s3c2410_serial_getsource, | |
1295 | .set_clksrc = s3c2410_serial_setsource, | |
1296 | .reset_port = s3c2410_serial_resetport, | |
1297 | }; | |
1298 | ||
1299 | /* device management */ | |
1300 | ||
3ae5eaec | 1301 | static int s3c2410_serial_probe(struct platform_device *dev) |
1da177e4 LT |
1302 | { |
1303 | return s3c24xx_serial_probe(dev, &s3c2410_uart_inf); | |
1304 | } | |
1305 | ||
3ae5eaec | 1306 | static struct platform_driver s3c2410_serial_drv = { |
1da177e4 LT |
1307 | .probe = s3c2410_serial_probe, |
1308 | .remove = s3c24xx_serial_remove, | |
1309 | .suspend = s3c24xx_serial_suspend, | |
1310 | .resume = s3c24xx_serial_resume, | |
3ae5eaec RK |
1311 | .driver = { |
1312 | .name = "s3c2410-uart", | |
1313 | .owner = THIS_MODULE, | |
1314 | }, | |
1da177e4 LT |
1315 | }; |
1316 | ||
1317 | static inline int s3c2410_serial_init(void) | |
1318 | { | |
1319 | return s3c24xx_serial_init(&s3c2410_serial_drv, &s3c2410_uart_inf); | |
1320 | } | |
1321 | ||
1322 | static inline void s3c2410_serial_exit(void) | |
1323 | { | |
3ae5eaec | 1324 | platform_driver_unregister(&s3c2410_serial_drv); |
1da177e4 LT |
1325 | } |
1326 | ||
1327 | #define s3c2410_uart_inf_at &s3c2410_uart_inf | |
1328 | #else | |
1329 | ||
1330 | static inline int s3c2410_serial_init(void) | |
1331 | { | |
1332 | return 0; | |
1333 | } | |
1334 | ||
1335 | static inline void s3c2410_serial_exit(void) | |
1336 | { | |
1337 | } | |
1338 | ||
1339 | #define s3c2410_uart_inf_at NULL | |
1340 | ||
1341 | #endif /* CONFIG_CPU_S3C2410 */ | |
1342 | ||
96ce2385 | 1343 | #if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2442) |
1da177e4 LT |
1344 | |
1345 | static int s3c2440_serial_setsource(struct uart_port *port, | |
1346 | struct s3c24xx_uart_clksrc *clk) | |
1347 | { | |
1348 | unsigned long ucon = rd_regl(port, S3C2410_UCON); | |
1349 | ||
1350 | // todo - proper fclk<>nonfclk switch // | |
1351 | ||
1352 | ucon &= ~S3C2440_UCON_CLKMASK; | |
1353 | ||
1354 | if (strcmp(clk->name, "uclk") == 0) | |
1355 | ucon |= S3C2440_UCON_UCLK; | |
1356 | else if (strcmp(clk->name, "pclk") == 0) | |
1357 | ucon |= S3C2440_UCON_PCLK; | |
1358 | else if (strcmp(clk->name, "fclk") == 0) | |
1359 | ucon |= S3C2440_UCON_FCLK; | |
1360 | else { | |
1361 | printk(KERN_ERR "unknown clock source %s\n", clk->name); | |
1362 | return -EINVAL; | |
1363 | } | |
1364 | ||
1365 | wr_regl(port, S3C2410_UCON, ucon); | |
1366 | return 0; | |
1367 | } | |
1368 | ||
1369 | ||
1370 | static int s3c2440_serial_getsource(struct uart_port *port, | |
1371 | struct s3c24xx_uart_clksrc *clk) | |
1372 | { | |
1373 | unsigned long ucon = rd_regl(port, S3C2410_UCON); | |
1374 | unsigned long ucon0, ucon1, ucon2; | |
1375 | ||
1376 | switch (ucon & S3C2440_UCON_CLKMASK) { | |
1377 | case S3C2440_UCON_UCLK: | |
1378 | clk->divisor = 1; | |
1379 | clk->name = "uclk"; | |
1380 | break; | |
1381 | ||
1382 | case S3C2440_UCON_PCLK: | |
1383 | case S3C2440_UCON_PCLK2: | |
1384 | clk->divisor = 1; | |
1385 | clk->name = "pclk"; | |
1386 | break; | |
1387 | ||
1388 | case S3C2440_UCON_FCLK: | |
1389 | /* the fun of calculating the uart divisors on | |
1390 | * the s3c2440 */ | |
1391 | ||
1392 | ucon0 = __raw_readl(S3C24XX_VA_UART0 + S3C2410_UCON); | |
1393 | ucon1 = __raw_readl(S3C24XX_VA_UART1 + S3C2410_UCON); | |
1394 | ucon2 = __raw_readl(S3C24XX_VA_UART2 + S3C2410_UCON); | |
1395 | ||
1396 | printk("ucons: %08lx, %08lx, %08lx\n", ucon0, ucon1, ucon2); | |
1397 | ||
1398 | ucon0 &= S3C2440_UCON0_DIVMASK; | |
1399 | ucon1 &= S3C2440_UCON1_DIVMASK; | |
1400 | ucon2 &= S3C2440_UCON2_DIVMASK; | |
1401 | ||
1402 | if (ucon0 != 0) { | |
1403 | clk->divisor = ucon0 >> S3C2440_UCON_DIVSHIFT; | |
1404 | clk->divisor += 6; | |
1405 | } else if (ucon1 != 0) { | |
1406 | clk->divisor = ucon1 >> S3C2440_UCON_DIVSHIFT; | |
1407 | clk->divisor += 21; | |
1408 | } else if (ucon2 != 0) { | |
1409 | clk->divisor = ucon2 >> S3C2440_UCON_DIVSHIFT; | |
1410 | clk->divisor += 36; | |
1411 | } else { | |
1412 | /* manual calims 44, seems to be 9 */ | |
1413 | clk->divisor = 9; | |
1414 | } | |
1415 | ||
1416 | clk->name = "fclk"; | |
1417 | break; | |
1418 | } | |
1419 | ||
1420 | return 0; | |
1421 | } | |
1422 | ||
1423 | static int s3c2440_serial_resetport(struct uart_port *port, | |
1424 | struct s3c2410_uartcfg *cfg) | |
1425 | { | |
1426 | unsigned long ucon = rd_regl(port, S3C2410_UCON); | |
1427 | ||
1428 | dbg("s3c2440_serial_resetport: port=%p (%08lx), cfg=%p\n", | |
1429 | port, port->mapbase, cfg); | |
1430 | ||
1431 | /* ensure we don't change the clock settings... */ | |
1432 | ||
1433 | ucon &= (S3C2440_UCON0_DIVMASK | (3<<10)); | |
1434 | ||
1435 | wr_regl(port, S3C2410_UCON, ucon | cfg->ucon); | |
1436 | wr_regl(port, S3C2410_ULCON, cfg->ulcon); | |
1437 | ||
1438 | /* reset both fifos */ | |
1439 | ||
1440 | wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH); | |
1441 | wr_regl(port, S3C2410_UFCON, cfg->ufcon); | |
1442 | ||
1443 | return 0; | |
1444 | } | |
1445 | ||
1446 | static struct s3c24xx_uart_info s3c2440_uart_inf = { | |
1447 | .name = "Samsung S3C2440 UART", | |
1448 | .type = PORT_S3C2440, | |
1449 | .fifosize = 64, | |
1450 | .rx_fifomask = S3C2440_UFSTAT_RXMASK, | |
1451 | .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT, | |
1452 | .rx_fifofull = S3C2440_UFSTAT_RXFULL, | |
1453 | .tx_fifofull = S3C2440_UFSTAT_TXFULL, | |
1454 | .tx_fifomask = S3C2440_UFSTAT_TXMASK, | |
1455 | .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT, | |
1456 | .get_clksrc = s3c2440_serial_getsource, | |
1457 | .set_clksrc = s3c2440_serial_setsource, | |
1458 | .reset_port = s3c2440_serial_resetport, | |
1459 | }; | |
1460 | ||
1461 | /* device management */ | |
1462 | ||
3ae5eaec | 1463 | static int s3c2440_serial_probe(struct platform_device *dev) |
1da177e4 LT |
1464 | { |
1465 | dbg("s3c2440_serial_probe: dev=%p\n", dev); | |
1466 | return s3c24xx_serial_probe(dev, &s3c2440_uart_inf); | |
1467 | } | |
1468 | ||
3ae5eaec | 1469 | static struct platform_driver s3c2440_serial_drv = { |
1da177e4 LT |
1470 | .probe = s3c2440_serial_probe, |
1471 | .remove = s3c24xx_serial_remove, | |
1472 | .suspend = s3c24xx_serial_suspend, | |
1473 | .resume = s3c24xx_serial_resume, | |
3ae5eaec RK |
1474 | .driver = { |
1475 | .name = "s3c2440-uart", | |
1476 | .owner = THIS_MODULE, | |
1477 | }, | |
1da177e4 LT |
1478 | }; |
1479 | ||
1480 | ||
1481 | static inline int s3c2440_serial_init(void) | |
1482 | { | |
1483 | return s3c24xx_serial_init(&s3c2440_serial_drv, &s3c2440_uart_inf); | |
1484 | } | |
1485 | ||
1486 | static inline void s3c2440_serial_exit(void) | |
1487 | { | |
3ae5eaec | 1488 | platform_driver_unregister(&s3c2440_serial_drv); |
1da177e4 LT |
1489 | } |
1490 | ||
1491 | #define s3c2440_uart_inf_at &s3c2440_uart_inf | |
1492 | #else | |
1493 | ||
1494 | static inline int s3c2440_serial_init(void) | |
1495 | { | |
1496 | return 0; | |
1497 | } | |
1498 | ||
1499 | static inline void s3c2440_serial_exit(void) | |
1500 | { | |
1501 | } | |
1502 | ||
1503 | #define s3c2440_uart_inf_at NULL | |
1504 | #endif /* CONFIG_CPU_S3C2440 */ | |
1505 | ||
1452750a | 1506 | #if defined(CONFIG_CPU_S3C2412) |
73e55cb3 BD |
1507 | |
1508 | static int s3c2412_serial_setsource(struct uart_port *port, | |
1509 | struct s3c24xx_uart_clksrc *clk) | |
1510 | { | |
1511 | unsigned long ucon = rd_regl(port, S3C2410_UCON); | |
1512 | ||
1513 | ucon &= ~S3C2412_UCON_CLKMASK; | |
1514 | ||
1515 | if (strcmp(clk->name, "uclk") == 0) | |
1516 | ucon |= S3C2440_UCON_UCLK; | |
1517 | else if (strcmp(clk->name, "pclk") == 0) | |
1518 | ucon |= S3C2440_UCON_PCLK; | |
1519 | else if (strcmp(clk->name, "usysclk") == 0) | |
1520 | ucon |= S3C2412_UCON_USYSCLK; | |
1521 | else { | |
1522 | printk(KERN_ERR "unknown clock source %s\n", clk->name); | |
1523 | return -EINVAL; | |
1524 | } | |
1525 | ||
1526 | wr_regl(port, S3C2410_UCON, ucon); | |
1527 | return 0; | |
1528 | } | |
1529 | ||
1530 | ||
1531 | static int s3c2412_serial_getsource(struct uart_port *port, | |
1532 | struct s3c24xx_uart_clksrc *clk) | |
1533 | { | |
1534 | unsigned long ucon = rd_regl(port, S3C2410_UCON); | |
1535 | ||
1536 | switch (ucon & S3C2412_UCON_CLKMASK) { | |
1537 | case S3C2412_UCON_UCLK: | |
1538 | clk->divisor = 1; | |
1539 | clk->name = "uclk"; | |
1540 | break; | |
1541 | ||
1542 | case S3C2412_UCON_PCLK: | |
1543 | case S3C2412_UCON_PCLK2: | |
1544 | clk->divisor = 1; | |
1545 | clk->name = "pclk"; | |
1546 | break; | |
1547 | ||
1548 | case S3C2412_UCON_USYSCLK: | |
1549 | clk->divisor = 1; | |
1550 | clk->name = "usysclk"; | |
1551 | break; | |
1552 | } | |
1553 | ||
1554 | return 0; | |
1555 | } | |
1556 | ||
1557 | static int s3c2412_serial_resetport(struct uart_port *port, | |
1558 | struct s3c2410_uartcfg *cfg) | |
1559 | { | |
1560 | unsigned long ucon = rd_regl(port, S3C2410_UCON); | |
1561 | ||
1562 | dbg("%s: port=%p (%08lx), cfg=%p\n", | |
71cc2c21 | 1563 | __func__, port, port->mapbase, cfg); |
73e55cb3 BD |
1564 | |
1565 | /* ensure we don't change the clock settings... */ | |
1566 | ||
1567 | ucon &= S3C2412_UCON_CLKMASK; | |
1568 | ||
1569 | wr_regl(port, S3C2410_UCON, ucon | cfg->ucon); | |
1570 | wr_regl(port, S3C2410_ULCON, cfg->ulcon); | |
1571 | ||
1572 | /* reset both fifos */ | |
1573 | ||
1574 | wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH); | |
1575 | wr_regl(port, S3C2410_UFCON, cfg->ufcon); | |
1576 | ||
1577 | return 0; | |
1578 | } | |
1579 | ||
1580 | static struct s3c24xx_uart_info s3c2412_uart_inf = { | |
1581 | .name = "Samsung S3C2412 UART", | |
1582 | .type = PORT_S3C2412, | |
1583 | .fifosize = 64, | |
1584 | .rx_fifomask = S3C2440_UFSTAT_RXMASK, | |
1585 | .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT, | |
1586 | .rx_fifofull = S3C2440_UFSTAT_RXFULL, | |
1587 | .tx_fifofull = S3C2440_UFSTAT_TXFULL, | |
1588 | .tx_fifomask = S3C2440_UFSTAT_TXMASK, | |
1589 | .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT, | |
1590 | .get_clksrc = s3c2412_serial_getsource, | |
1591 | .set_clksrc = s3c2412_serial_setsource, | |
1592 | .reset_port = s3c2412_serial_resetport, | |
1593 | }; | |
1594 | ||
1595 | /* device management */ | |
1596 | ||
1597 | static int s3c2412_serial_probe(struct platform_device *dev) | |
1598 | { | |
1599 | dbg("s3c2440_serial_probe: dev=%p\n", dev); | |
71aa7054 | 1600 | return s3c24xx_serial_probe(dev, &s3c2412_uart_inf); |
73e55cb3 BD |
1601 | } |
1602 | ||
1603 | static struct platform_driver s3c2412_serial_drv = { | |
1604 | .probe = s3c2412_serial_probe, | |
1605 | .remove = s3c24xx_serial_remove, | |
1606 | .suspend = s3c24xx_serial_suspend, | |
1607 | .resume = s3c24xx_serial_resume, | |
1608 | .driver = { | |
1609 | .name = "s3c2412-uart", | |
1610 | .owner = THIS_MODULE, | |
1611 | }, | |
1612 | }; | |
1613 | ||
1614 | ||
1615 | static inline int s3c2412_serial_init(void) | |
1616 | { | |
1617 | return s3c24xx_serial_init(&s3c2412_serial_drv, &s3c2412_uart_inf); | |
1618 | } | |
1619 | ||
1620 | static inline void s3c2412_serial_exit(void) | |
1621 | { | |
1622 | platform_driver_unregister(&s3c2412_serial_drv); | |
1623 | } | |
1624 | ||
1625 | #define s3c2412_uart_inf_at &s3c2412_uart_inf | |
1626 | #else | |
1627 | ||
1628 | static inline int s3c2412_serial_init(void) | |
1629 | { | |
1630 | return 0; | |
1631 | } | |
1632 | ||
1633 | static inline void s3c2412_serial_exit(void) | |
1634 | { | |
1635 | } | |
1636 | ||
1637 | #define s3c2412_uart_inf_at NULL | |
1638 | #endif /* CONFIG_CPU_S3C2440 */ | |
1639 | ||
1640 | ||
1da177e4 LT |
1641 | /* module initialisation code */ |
1642 | ||
1643 | static int __init s3c24xx_serial_modinit(void) | |
1644 | { | |
1645 | int ret; | |
1646 | ||
1647 | ret = uart_register_driver(&s3c24xx_uart_drv); | |
1648 | if (ret < 0) { | |
1649 | printk(KERN_ERR "failed to register UART driver\n"); | |
1650 | return -1; | |
1651 | } | |
1652 | ||
1653 | s3c2400_serial_init(); | |
1654 | s3c2410_serial_init(); | |
73e55cb3 | 1655 | s3c2412_serial_init(); |
1da177e4 LT |
1656 | s3c2440_serial_init(); |
1657 | ||
1658 | return 0; | |
1659 | } | |
1660 | ||
1661 | static void __exit s3c24xx_serial_modexit(void) | |
1662 | { | |
1663 | s3c2400_serial_exit(); | |
1664 | s3c2410_serial_exit(); | |
73e55cb3 | 1665 | s3c2412_serial_exit(); |
1da177e4 LT |
1666 | s3c2440_serial_exit(); |
1667 | ||
1668 | uart_unregister_driver(&s3c24xx_uart_drv); | |
1669 | } | |
1670 | ||
1671 | ||
1672 | module_init(s3c24xx_serial_modinit); | |
1673 | module_exit(s3c24xx_serial_modexit); | |
1674 | ||
1675 | /* Console code */ | |
1676 | ||
1677 | #ifdef CONFIG_SERIAL_S3C2410_CONSOLE | |
1678 | ||
1679 | static struct uart_port *cons_uart; | |
1680 | ||
1681 | static int | |
1682 | s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon) | |
1683 | { | |
1684 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
1685 | unsigned long ufstat, utrstat; | |
1686 | ||
1687 | if (ufcon & S3C2410_UFCON_FIFOMODE) { | |
1688 | /* fifo mode - check ammount of data in fifo registers... */ | |
1689 | ||
1690 | ufstat = rd_regl(port, S3C2410_UFSTAT); | |
1691 | return (ufstat & info->tx_fifofull) ? 0 : 1; | |
1692 | } | |
1693 | ||
1694 | /* in non-fifo mode, we go and use the tx buffer empty */ | |
1695 | ||
1696 | utrstat = rd_regl(port, S3C2410_UTRSTAT); | |
1697 | return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0; | |
1698 | } | |
1699 | ||
1700 | static void | |
d358788f | 1701 | s3c24xx_serial_console_putchar(struct uart_port *port, int ch) |
1da177e4 | 1702 | { |
1da177e4 | 1703 | unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON); |
d358788f RK |
1704 | while (!s3c24xx_serial_console_txrdy(port, ufcon)) |
1705 | barrier(); | |
1706 | wr_regb(cons_uart, S3C2410_UTXH, ch); | |
1707 | } | |
1da177e4 | 1708 | |
d358788f RK |
1709 | static void |
1710 | s3c24xx_serial_console_write(struct console *co, const char *s, | |
1711 | unsigned int count) | |
1712 | { | |
1713 | uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar); | |
1da177e4 LT |
1714 | } |
1715 | ||
1716 | static void __init | |
1717 | s3c24xx_serial_get_options(struct uart_port *port, int *baud, | |
1718 | int *parity, int *bits) | |
1719 | { | |
1720 | struct s3c24xx_uart_clksrc clksrc; | |
1721 | struct clk *clk; | |
1722 | unsigned int ulcon; | |
1723 | unsigned int ucon; | |
1724 | unsigned int ubrdiv; | |
1725 | unsigned long rate; | |
1726 | ||
1727 | ulcon = rd_regl(port, S3C2410_ULCON); | |
1728 | ucon = rd_regl(port, S3C2410_UCON); | |
1729 | ubrdiv = rd_regl(port, S3C2410_UBRDIV); | |
1730 | ||
1731 | dbg("s3c24xx_serial_get_options: port=%p\n" | |
1732 | "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n", | |
1733 | port, ulcon, ucon, ubrdiv); | |
1734 | ||
1735 | if ((ucon & 0xf) != 0) { | |
1736 | /* consider the serial port configured if the tx/rx mode set */ | |
1737 | ||
1738 | switch (ulcon & S3C2410_LCON_CSMASK) { | |
1739 | case S3C2410_LCON_CS5: | |
1740 | *bits = 5; | |
1741 | break; | |
1742 | case S3C2410_LCON_CS6: | |
1743 | *bits = 6; | |
1744 | break; | |
1745 | case S3C2410_LCON_CS7: | |
1746 | *bits = 7; | |
1747 | break; | |
1748 | default: | |
1749 | case S3C2410_LCON_CS8: | |
1750 | *bits = 8; | |
1751 | break; | |
1752 | } | |
1753 | ||
1754 | switch (ulcon & S3C2410_LCON_PMASK) { | |
1755 | case S3C2410_LCON_PEVEN: | |
1756 | *parity = 'e'; | |
1757 | break; | |
1758 | ||
1759 | case S3C2410_LCON_PODD: | |
1760 | *parity = 'o'; | |
1761 | break; | |
1762 | ||
1763 | case S3C2410_LCON_PNONE: | |
1764 | default: | |
1765 | *parity = 'n'; | |
1766 | } | |
1767 | ||
1768 | /* now calculate the baud rate */ | |
1769 | ||
1770 | s3c24xx_serial_getsource(port, &clksrc); | |
1771 | ||
1772 | clk = clk_get(port->dev, clksrc.name); | |
1773 | if (!IS_ERR(clk) && clk != NULL) | |
1774 | rate = clk_get_rate(clk) / clksrc.divisor; | |
1775 | else | |
1776 | rate = 1; | |
1777 | ||
1778 | ||
1779 | *baud = rate / ( 16 * (ubrdiv + 1)); | |
1780 | dbg("calculated baud %d\n", *baud); | |
1781 | } | |
1782 | ||
1783 | } | |
1784 | ||
1785 | /* s3c24xx_serial_init_ports | |
1786 | * | |
1787 | * initialise the serial ports from the machine provided initialisation | |
1788 | * data. | |
1789 | */ | |
1790 | ||
1791 | static int s3c24xx_serial_init_ports(struct s3c24xx_uart_info *info) | |
1792 | { | |
1793 | struct s3c24xx_uart_port *ptr = s3c24xx_serial_ports; | |
1794 | struct platform_device **platdev_ptr; | |
1795 | int i; | |
1796 | ||
1797 | dbg("s3c24xx_serial_init_ports: initialising ports...\n"); | |
1798 | ||
1799 | platdev_ptr = s3c24xx_uart_devs; | |
1800 | ||
1801 | for (i = 0; i < NR_PORTS; i++, ptr++, platdev_ptr++) { | |
1802 | s3c24xx_serial_init_port(ptr, info, *platdev_ptr); | |
1803 | } | |
1804 | ||
1805 | return 0; | |
1806 | } | |
1807 | ||
1808 | static int __init | |
1809 | s3c24xx_serial_console_setup(struct console *co, char *options) | |
1810 | { | |
1811 | struct uart_port *port; | |
1812 | int baud = 9600; | |
1813 | int bits = 8; | |
1814 | int parity = 'n'; | |
1815 | int flow = 'n'; | |
1816 | ||
1817 | dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n", | |
1818 | co, co->index, options); | |
1819 | ||
1820 | /* is this a valid port */ | |
1821 | ||
1822 | if (co->index == -1 || co->index >= NR_PORTS) | |
1823 | co->index = 0; | |
1824 | ||
1825 | port = &s3c24xx_serial_ports[co->index].port; | |
1826 | ||
1827 | /* is the port configured? */ | |
1828 | ||
1829 | if (port->mapbase == 0x0) { | |
1830 | co->index = 0; | |
1831 | port = &s3c24xx_serial_ports[co->index].port; | |
1832 | } | |
1833 | ||
1834 | cons_uart = port; | |
1835 | ||
1836 | dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index); | |
1837 | ||
1838 | /* | |
1839 | * Check whether an invalid uart number has been specified, and | |
1840 | * if so, search for the first available port that does have | |
1841 | * console support. | |
1842 | */ | |
1843 | if (options) | |
1844 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
1845 | else | |
1846 | s3c24xx_serial_get_options(port, &baud, &parity, &bits); | |
1847 | ||
1848 | dbg("s3c24xx_serial_console_setup: baud %d\n", baud); | |
1849 | ||
1850 | return uart_set_options(port, co, baud, parity, bits, flow); | |
1851 | } | |
1852 | ||
1853 | /* s3c24xx_serial_initconsole | |
1854 | * | |
1855 | * initialise the console from one of the uart drivers | |
1856 | */ | |
1857 | ||
1858 | static struct console s3c24xx_serial_console = | |
1859 | { | |
1860 | .name = S3C24XX_SERIAL_NAME, | |
1861 | .device = uart_console_device, | |
1862 | .flags = CON_PRINTBUFFER, | |
1863 | .index = -1, | |
1864 | .write = s3c24xx_serial_console_write, | |
1865 | .setup = s3c24xx_serial_console_setup | |
1866 | }; | |
1867 | ||
1868 | static int s3c24xx_serial_initconsole(void) | |
1869 | { | |
1870 | struct s3c24xx_uart_info *info; | |
1871 | struct platform_device *dev = s3c24xx_uart_devs[0]; | |
1872 | ||
1873 | dbg("s3c24xx_serial_initconsole\n"); | |
1874 | ||
1875 | /* select driver based on the cpu */ | |
1876 | ||
1877 | if (dev == NULL) { | |
1878 | printk(KERN_ERR "s3c24xx: no devices for console init\n"); | |
1879 | return 0; | |
1880 | } | |
1881 | ||
1882 | if (strcmp(dev->name, "s3c2400-uart") == 0) { | |
1883 | info = s3c2400_uart_inf_at; | |
1884 | } else if (strcmp(dev->name, "s3c2410-uart") == 0) { | |
1885 | info = s3c2410_uart_inf_at; | |
1886 | } else if (strcmp(dev->name, "s3c2440-uart") == 0) { | |
1887 | info = s3c2440_uart_inf_at; | |
73e55cb3 BD |
1888 | } else if (strcmp(dev->name, "s3c2412-uart") == 0) { |
1889 | info = s3c2412_uart_inf_at; | |
1da177e4 LT |
1890 | } else { |
1891 | printk(KERN_ERR "s3c24xx: no driver for %s\n", dev->name); | |
1892 | return 0; | |
1893 | } | |
1894 | ||
1895 | if (info == NULL) { | |
1896 | printk(KERN_ERR "s3c24xx: no driver for console\n"); | |
1897 | return 0; | |
1898 | } | |
1899 | ||
1900 | s3c24xx_serial_console.data = &s3c24xx_uart_drv; | |
1901 | s3c24xx_serial_init_ports(info); | |
1902 | ||
1903 | register_console(&s3c24xx_serial_console); | |
1904 | return 0; | |
1905 | } | |
1906 | ||
1907 | console_initcall(s3c24xx_serial_initconsole); | |
1908 | ||
1909 | #endif /* CONFIG_SERIAL_S3C2410_CONSOLE */ | |
1910 | ||
1911 | MODULE_LICENSE("GPL"); | |
1912 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); | |
73e55cb3 | 1913 | MODULE_DESCRIPTION("Samsung S3C2410/S3C2440/S3C2412 Serial port driver"); |
e169c139 KS |
1914 | MODULE_ALIAS("platform:s3c2400-uart"); |
1915 | MODULE_ALIAS("platform:s3c2410-uart"); | |
1916 | MODULE_ALIAS("platform:s3c2412-uart"); | |
1917 | MODULE_ALIAS("platform:s3c2440-uart"); |