Commit | Line | Data |
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99edb3d1 | 1 | /* |
b497549a BD |
2 | * Driver core for Samsung SoC onboard UARTs. |
3 | * | |
ccae941e | 4 | * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics |
b497549a BD |
5 | * http://armlinux.simtec.co.uk/ |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | /* Hote on 2410 error handling | |
13 | * | |
14 | * The s3c2410 manual has a love/hate affair with the contents of the | |
15 | * UERSTAT register in the UART blocks, and keeps marking some of the | |
16 | * error bits as reserved. Having checked with the s3c2410x01, | |
17 | * it copes with BREAKs properly, so I am happy to ignore the RESERVED | |
18 | * feature from the latter versions of the manual. | |
19 | * | |
20 | * If it becomes aparrent that latter versions of the 2410 remove these | |
21 | * bits, then action will have to be taken to differentiate the versions | |
22 | * and change the policy on BREAK | |
23 | * | |
24 | * BJD, 04-Nov-2004 | |
25 | */ | |
26 | ||
27 | #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
28 | #define SUPPORT_SYSRQ | |
29 | #endif | |
30 | ||
31 | #include <linux/module.h> | |
32 | #include <linux/ioport.h> | |
33 | #include <linux/io.h> | |
34 | #include <linux/platform_device.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/sysrq.h> | |
37 | #include <linux/console.h> | |
38 | #include <linux/tty.h> | |
39 | #include <linux/tty_flip.h> | |
40 | #include <linux/serial_core.h> | |
41 | #include <linux/serial.h> | |
42 | #include <linux/delay.h> | |
43 | #include <linux/clk.h> | |
30555476 | 44 | #include <linux/cpufreq.h> |
b497549a BD |
45 | |
46 | #include <asm/irq.h> | |
47 | ||
a09e64fb | 48 | #include <mach/hardware.h> |
b690ace5 | 49 | #include <mach/map.h> |
b497549a | 50 | |
a2b7ba9c | 51 | #include <plat/regs-serial.h> |
5f5a7a55 | 52 | #include <plat/clock.h> |
b497549a BD |
53 | |
54 | #include "samsung.h" | |
55 | ||
56 | /* UART name and device definitions */ | |
57 | ||
58 | #define S3C24XX_SERIAL_NAME "ttySAC" | |
59 | #define S3C24XX_SERIAL_MAJOR 204 | |
60 | #define S3C24XX_SERIAL_MINOR 64 | |
61 | ||
b497549a BD |
62 | /* macros to change one thing to another */ |
63 | ||
64 | #define tx_enabled(port) ((port)->unused[0]) | |
65 | #define rx_enabled(port) ((port)->unused[1]) | |
66 | ||
25985edc | 67 | /* flag to ignore all characters coming in */ |
b497549a BD |
68 | #define RXSTAT_DUMMY_READ (0x10000000) |
69 | ||
70 | static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port) | |
71 | { | |
72 | return container_of(port, struct s3c24xx_uart_port, port); | |
73 | } | |
74 | ||
75 | /* translate a port to the device name */ | |
76 | ||
77 | static inline const char *s3c24xx_serial_portname(struct uart_port *port) | |
78 | { | |
79 | return to_platform_device(port->dev)->name; | |
80 | } | |
81 | ||
82 | static int s3c24xx_serial_txempty_nofifo(struct uart_port *port) | |
83 | { | |
84 | return (rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE); | |
85 | } | |
86 | ||
88bb4ea1 TA |
87 | /* |
88 | * s3c64xx and later SoC's include the interrupt mask and status registers in | |
89 | * the controller itself, unlike the s3c24xx SoC's which have these registers | |
90 | * in the interrupt controller. Check if the port type is s3c64xx or higher. | |
91 | */ | |
92 | static int s3c24xx_serial_has_interrupt_mask(struct uart_port *port) | |
93 | { | |
94 | return to_ourport(port)->info->type == PORT_S3C6400; | |
95 | } | |
96 | ||
b497549a BD |
97 | static void s3c24xx_serial_rx_enable(struct uart_port *port) |
98 | { | |
99 | unsigned long flags; | |
100 | unsigned int ucon, ufcon; | |
101 | int count = 10000; | |
102 | ||
103 | spin_lock_irqsave(&port->lock, flags); | |
104 | ||
105 | while (--count && !s3c24xx_serial_txempty_nofifo(port)) | |
106 | udelay(100); | |
107 | ||
108 | ufcon = rd_regl(port, S3C2410_UFCON); | |
109 | ufcon |= S3C2410_UFCON_RESETRX; | |
110 | wr_regl(port, S3C2410_UFCON, ufcon); | |
111 | ||
112 | ucon = rd_regl(port, S3C2410_UCON); | |
113 | ucon |= S3C2410_UCON_RXIRQMODE; | |
114 | wr_regl(port, S3C2410_UCON, ucon); | |
115 | ||
116 | rx_enabled(port) = 1; | |
117 | spin_unlock_irqrestore(&port->lock, flags); | |
118 | } | |
119 | ||
120 | static void s3c24xx_serial_rx_disable(struct uart_port *port) | |
121 | { | |
122 | unsigned long flags; | |
123 | unsigned int ucon; | |
124 | ||
125 | spin_lock_irqsave(&port->lock, flags); | |
126 | ||
127 | ucon = rd_regl(port, S3C2410_UCON); | |
128 | ucon &= ~S3C2410_UCON_RXIRQMODE; | |
129 | wr_regl(port, S3C2410_UCON, ucon); | |
130 | ||
131 | rx_enabled(port) = 0; | |
132 | spin_unlock_irqrestore(&port->lock, flags); | |
133 | } | |
134 | ||
135 | static void s3c24xx_serial_stop_tx(struct uart_port *port) | |
136 | { | |
b73c289c BD |
137 | struct s3c24xx_uart_port *ourport = to_ourport(port); |
138 | ||
b497549a | 139 | if (tx_enabled(port)) { |
88bb4ea1 TA |
140 | if (s3c24xx_serial_has_interrupt_mask(port)) |
141 | __set_bit(S3C64XX_UINTM_TXD, | |
142 | portaddrl(port, S3C64XX_UINTM)); | |
143 | else | |
144 | disable_irq_nosync(ourport->tx_irq); | |
b497549a BD |
145 | tx_enabled(port) = 0; |
146 | if (port->flags & UPF_CONS_FLOW) | |
147 | s3c24xx_serial_rx_enable(port); | |
148 | } | |
149 | } | |
150 | ||
151 | static void s3c24xx_serial_start_tx(struct uart_port *port) | |
152 | { | |
b73c289c BD |
153 | struct s3c24xx_uart_port *ourport = to_ourport(port); |
154 | ||
b497549a BD |
155 | if (!tx_enabled(port)) { |
156 | if (port->flags & UPF_CONS_FLOW) | |
157 | s3c24xx_serial_rx_disable(port); | |
158 | ||
88bb4ea1 TA |
159 | if (s3c24xx_serial_has_interrupt_mask(port)) |
160 | __clear_bit(S3C64XX_UINTM_TXD, | |
161 | portaddrl(port, S3C64XX_UINTM)); | |
162 | else | |
163 | enable_irq(ourport->tx_irq); | |
b497549a BD |
164 | tx_enabled(port) = 1; |
165 | } | |
166 | } | |
167 | ||
b497549a BD |
168 | static void s3c24xx_serial_stop_rx(struct uart_port *port) |
169 | { | |
b73c289c BD |
170 | struct s3c24xx_uart_port *ourport = to_ourport(port); |
171 | ||
b497549a BD |
172 | if (rx_enabled(port)) { |
173 | dbg("s3c24xx_serial_stop_rx: port=%p\n", port); | |
88bb4ea1 TA |
174 | if (s3c24xx_serial_has_interrupt_mask(port)) |
175 | __set_bit(S3C64XX_UINTM_RXD, | |
176 | portaddrl(port, S3C64XX_UINTM)); | |
177 | else | |
178 | disable_irq_nosync(ourport->rx_irq); | |
b497549a BD |
179 | rx_enabled(port) = 0; |
180 | } | |
181 | } | |
182 | ||
183 | static void s3c24xx_serial_enable_ms(struct uart_port *port) | |
184 | { | |
185 | } | |
186 | ||
187 | static inline struct s3c24xx_uart_info *s3c24xx_port_to_info(struct uart_port *port) | |
188 | { | |
189 | return to_ourport(port)->info; | |
190 | } | |
191 | ||
192 | static inline struct s3c2410_uartcfg *s3c24xx_port_to_cfg(struct uart_port *port) | |
193 | { | |
4d84e970 TA |
194 | struct s3c24xx_uart_port *ourport; |
195 | ||
b497549a BD |
196 | if (port->dev == NULL) |
197 | return NULL; | |
198 | ||
4d84e970 TA |
199 | ourport = container_of(port, struct s3c24xx_uart_port, port); |
200 | return ourport->cfg; | |
b497549a BD |
201 | } |
202 | ||
203 | static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport, | |
204 | unsigned long ufstat) | |
205 | { | |
206 | struct s3c24xx_uart_info *info = ourport->info; | |
207 | ||
208 | if (ufstat & info->rx_fifofull) | |
209 | return info->fifosize; | |
210 | ||
211 | return (ufstat & info->rx_fifomask) >> info->rx_fifoshift; | |
212 | } | |
213 | ||
214 | ||
215 | /* ? - where has parity gone?? */ | |
216 | #define S3C2410_UERSTAT_PARITY (0x1000) | |
217 | ||
218 | static irqreturn_t | |
219 | s3c24xx_serial_rx_chars(int irq, void *dev_id) | |
220 | { | |
221 | struct s3c24xx_uart_port *ourport = dev_id; | |
222 | struct uart_port *port = &ourport->port; | |
ebd2c8f6 | 223 | struct tty_struct *tty = port->state->port.tty; |
b497549a BD |
224 | unsigned int ufcon, ch, flag, ufstat, uerstat; |
225 | int max_count = 64; | |
226 | ||
227 | while (max_count-- > 0) { | |
228 | ufcon = rd_regl(port, S3C2410_UFCON); | |
229 | ufstat = rd_regl(port, S3C2410_UFSTAT); | |
230 | ||
231 | if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0) | |
232 | break; | |
233 | ||
234 | uerstat = rd_regl(port, S3C2410_UERSTAT); | |
235 | ch = rd_regb(port, S3C2410_URXH); | |
236 | ||
237 | if (port->flags & UPF_CONS_FLOW) { | |
238 | int txe = s3c24xx_serial_txempty_nofifo(port); | |
239 | ||
240 | if (rx_enabled(port)) { | |
241 | if (!txe) { | |
242 | rx_enabled(port) = 0; | |
243 | continue; | |
244 | } | |
245 | } else { | |
246 | if (txe) { | |
247 | ufcon |= S3C2410_UFCON_RESETRX; | |
248 | wr_regl(port, S3C2410_UFCON, ufcon); | |
249 | rx_enabled(port) = 1; | |
250 | goto out; | |
251 | } | |
252 | continue; | |
253 | } | |
254 | } | |
255 | ||
256 | /* insert the character into the buffer */ | |
257 | ||
258 | flag = TTY_NORMAL; | |
259 | port->icount.rx++; | |
260 | ||
261 | if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) { | |
262 | dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n", | |
263 | ch, uerstat); | |
264 | ||
265 | /* check for break */ | |
266 | if (uerstat & S3C2410_UERSTAT_BREAK) { | |
267 | dbg("break!\n"); | |
268 | port->icount.brk++; | |
269 | if (uart_handle_break(port)) | |
270 | goto ignore_char; | |
271 | } | |
272 | ||
273 | if (uerstat & S3C2410_UERSTAT_FRAME) | |
274 | port->icount.frame++; | |
275 | if (uerstat & S3C2410_UERSTAT_OVERRUN) | |
276 | port->icount.overrun++; | |
277 | ||
278 | uerstat &= port->read_status_mask; | |
279 | ||
280 | if (uerstat & S3C2410_UERSTAT_BREAK) | |
281 | flag = TTY_BREAK; | |
282 | else if (uerstat & S3C2410_UERSTAT_PARITY) | |
283 | flag = TTY_PARITY; | |
284 | else if (uerstat & (S3C2410_UERSTAT_FRAME | | |
285 | S3C2410_UERSTAT_OVERRUN)) | |
286 | flag = TTY_FRAME; | |
287 | } | |
288 | ||
289 | if (uart_handle_sysrq_char(port, ch)) | |
290 | goto ignore_char; | |
291 | ||
292 | uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN, | |
293 | ch, flag); | |
294 | ||
295 | ignore_char: | |
296 | continue; | |
297 | } | |
298 | tty_flip_buffer_push(tty); | |
299 | ||
300 | out: | |
301 | return IRQ_HANDLED; | |
302 | } | |
303 | ||
304 | static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id) | |
305 | { | |
306 | struct s3c24xx_uart_port *ourport = id; | |
307 | struct uart_port *port = &ourport->port; | |
ebd2c8f6 | 308 | struct circ_buf *xmit = &port->state->xmit; |
b497549a BD |
309 | int count = 256; |
310 | ||
311 | if (port->x_char) { | |
312 | wr_regb(port, S3C2410_UTXH, port->x_char); | |
313 | port->icount.tx++; | |
314 | port->x_char = 0; | |
315 | goto out; | |
316 | } | |
317 | ||
25985edc | 318 | /* if there isn't anything more to transmit, or the uart is now |
b497549a BD |
319 | * stopped, disable the uart and exit |
320 | */ | |
321 | ||
322 | if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { | |
323 | s3c24xx_serial_stop_tx(port); | |
324 | goto out; | |
325 | } | |
326 | ||
327 | /* try and drain the buffer... */ | |
328 | ||
329 | while (!uart_circ_empty(xmit) && count-- > 0) { | |
330 | if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull) | |
331 | break; | |
332 | ||
333 | wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]); | |
334 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
335 | port->icount.tx++; | |
336 | } | |
337 | ||
338 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
339 | uart_write_wakeup(port); | |
340 | ||
341 | if (uart_circ_empty(xmit)) | |
342 | s3c24xx_serial_stop_tx(port); | |
343 | ||
344 | out: | |
345 | return IRQ_HANDLED; | |
346 | } | |
347 | ||
88bb4ea1 TA |
348 | /* interrupt handler for s3c64xx and later SoC's.*/ |
349 | static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id) | |
350 | { | |
351 | struct s3c24xx_uart_port *ourport = id; | |
352 | struct uart_port *port = &ourport->port; | |
353 | unsigned int pend = rd_regl(port, S3C64XX_UINTP); | |
354 | unsigned long flags; | |
355 | irqreturn_t ret = IRQ_HANDLED; | |
356 | ||
357 | spin_lock_irqsave(&port->lock, flags); | |
358 | if (pend & S3C64XX_UINTM_RXD_MSK) { | |
359 | ret = s3c24xx_serial_rx_chars(irq, id); | |
360 | wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_RXD_MSK); | |
361 | } | |
362 | if (pend & S3C64XX_UINTM_TXD_MSK) { | |
363 | ret = s3c24xx_serial_tx_chars(irq, id); | |
364 | wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_TXD_MSK); | |
365 | } | |
366 | spin_unlock_irqrestore(&port->lock, flags); | |
367 | return ret; | |
368 | } | |
369 | ||
b497549a BD |
370 | static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port) |
371 | { | |
372 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
373 | unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT); | |
374 | unsigned long ufcon = rd_regl(port, S3C2410_UFCON); | |
375 | ||
376 | if (ufcon & S3C2410_UFCON_FIFOMODE) { | |
377 | if ((ufstat & info->tx_fifomask) != 0 || | |
378 | (ufstat & info->tx_fifofull)) | |
379 | return 0; | |
380 | ||
381 | return 1; | |
382 | } | |
383 | ||
384 | return s3c24xx_serial_txempty_nofifo(port); | |
385 | } | |
386 | ||
387 | /* no modem control lines */ | |
388 | static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port) | |
389 | { | |
390 | unsigned int umstat = rd_regb(port, S3C2410_UMSTAT); | |
391 | ||
392 | if (umstat & S3C2410_UMSTAT_CTS) | |
393 | return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; | |
394 | else | |
395 | return TIOCM_CAR | TIOCM_DSR; | |
396 | } | |
397 | ||
398 | static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
399 | { | |
400 | /* todo - possibly remove AFC and do manual CTS */ | |
401 | } | |
402 | ||
403 | static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state) | |
404 | { | |
405 | unsigned long flags; | |
406 | unsigned int ucon; | |
407 | ||
408 | spin_lock_irqsave(&port->lock, flags); | |
409 | ||
410 | ucon = rd_regl(port, S3C2410_UCON); | |
411 | ||
412 | if (break_state) | |
413 | ucon |= S3C2410_UCON_SBREAK; | |
414 | else | |
415 | ucon &= ~S3C2410_UCON_SBREAK; | |
416 | ||
417 | wr_regl(port, S3C2410_UCON, ucon); | |
418 | ||
419 | spin_unlock_irqrestore(&port->lock, flags); | |
420 | } | |
421 | ||
422 | static void s3c24xx_serial_shutdown(struct uart_port *port) | |
423 | { | |
424 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
425 | ||
426 | if (ourport->tx_claimed) { | |
88bb4ea1 TA |
427 | if (!s3c24xx_serial_has_interrupt_mask(port)) |
428 | free_irq(ourport->tx_irq, ourport); | |
b497549a BD |
429 | tx_enabled(port) = 0; |
430 | ourport->tx_claimed = 0; | |
431 | } | |
432 | ||
433 | if (ourport->rx_claimed) { | |
88bb4ea1 TA |
434 | if (!s3c24xx_serial_has_interrupt_mask(port)) |
435 | free_irq(ourport->rx_irq, ourport); | |
b497549a BD |
436 | ourport->rx_claimed = 0; |
437 | rx_enabled(port) = 0; | |
438 | } | |
b497549a | 439 | |
88bb4ea1 TA |
440 | /* Clear pending interrupts and mask all interrupts */ |
441 | if (s3c24xx_serial_has_interrupt_mask(port)) { | |
442 | wr_regl(port, S3C64XX_UINTP, 0xf); | |
443 | wr_regl(port, S3C64XX_UINTM, 0xf); | |
444 | } | |
445 | } | |
b497549a BD |
446 | |
447 | static int s3c24xx_serial_startup(struct uart_port *port) | |
448 | { | |
449 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
450 | int ret; | |
451 | ||
452 | dbg("s3c24xx_serial_startup: port=%p (%08lx,%p)\n", | |
453 | port->mapbase, port->membase); | |
454 | ||
455 | rx_enabled(port) = 1; | |
456 | ||
b73c289c | 457 | ret = request_irq(ourport->rx_irq, s3c24xx_serial_rx_chars, 0, |
b497549a BD |
458 | s3c24xx_serial_portname(port), ourport); |
459 | ||
460 | if (ret != 0) { | |
b73c289c | 461 | printk(KERN_ERR "cannot get irq %d\n", ourport->rx_irq); |
b497549a BD |
462 | return ret; |
463 | } | |
464 | ||
465 | ourport->rx_claimed = 1; | |
466 | ||
467 | dbg("requesting tx irq...\n"); | |
468 | ||
469 | tx_enabled(port) = 1; | |
470 | ||
b73c289c | 471 | ret = request_irq(ourport->tx_irq, s3c24xx_serial_tx_chars, 0, |
b497549a BD |
472 | s3c24xx_serial_portname(port), ourport); |
473 | ||
474 | if (ret) { | |
b73c289c | 475 | printk(KERN_ERR "cannot get irq %d\n", ourport->tx_irq); |
b497549a BD |
476 | goto err; |
477 | } | |
478 | ||
479 | ourport->tx_claimed = 1; | |
480 | ||
481 | dbg("s3c24xx_serial_startup ok\n"); | |
482 | ||
483 | /* the port reset code should have done the correct | |
484 | * register setup for the port controls */ | |
485 | ||
486 | return ret; | |
487 | ||
488 | err: | |
489 | s3c24xx_serial_shutdown(port); | |
490 | return ret; | |
491 | } | |
492 | ||
88bb4ea1 TA |
493 | static int s3c64xx_serial_startup(struct uart_port *port) |
494 | { | |
495 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
496 | int ret; | |
497 | ||
498 | dbg("s3c64xx_serial_startup: port=%p (%08lx,%p)\n", | |
499 | port->mapbase, port->membase); | |
500 | ||
501 | ret = request_irq(port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED, | |
502 | s3c24xx_serial_portname(port), ourport); | |
503 | if (ret) { | |
504 | printk(KERN_ERR "cannot get irq %d\n", port->irq); | |
505 | return ret; | |
506 | } | |
507 | ||
508 | /* For compatibility with s3c24xx Soc's */ | |
509 | rx_enabled(port) = 1; | |
510 | ourport->rx_claimed = 1; | |
511 | tx_enabled(port) = 0; | |
512 | ourport->tx_claimed = 1; | |
513 | ||
514 | /* Enable Rx Interrupt */ | |
515 | __clear_bit(S3C64XX_UINTM_RXD, portaddrl(port, S3C64XX_UINTM)); | |
516 | dbg("s3c64xx_serial_startup ok\n"); | |
517 | return ret; | |
518 | } | |
519 | ||
b497549a BD |
520 | /* power power management control */ |
521 | ||
522 | static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level, | |
523 | unsigned int old) | |
524 | { | |
525 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
526 | ||
30555476 BD |
527 | ourport->pm_level = level; |
528 | ||
b497549a BD |
529 | switch (level) { |
530 | case 3: | |
531 | if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL) | |
532 | clk_disable(ourport->baudclk); | |
533 | ||
534 | clk_disable(ourport->clk); | |
535 | break; | |
536 | ||
537 | case 0: | |
538 | clk_enable(ourport->clk); | |
539 | ||
540 | if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL) | |
541 | clk_enable(ourport->baudclk); | |
542 | ||
543 | break; | |
544 | default: | |
545 | printk(KERN_ERR "s3c24xx_serial: unknown pm %d\n", level); | |
546 | } | |
547 | } | |
548 | ||
549 | /* baud rate calculation | |
550 | * | |
551 | * The UARTs on the S3C2410/S3C2440 can take their clocks from a number | |
552 | * of different sources, including the peripheral clock ("pclk") and an | |
553 | * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk") | |
554 | * with a programmable extra divisor. | |
555 | * | |
556 | * The following code goes through the clock sources, and calculates the | |
557 | * baud clocks (and the resultant actual baud rates) and then tries to | |
558 | * pick the closest one and select that. | |
559 | * | |
560 | */ | |
561 | ||
5f5a7a55 | 562 | #define MAX_CLK_NAME_LENGTH 15 |
b497549a | 563 | |
5f5a7a55 | 564 | static inline int s3c24xx_serial_getsource(struct uart_port *port) |
b497549a BD |
565 | { |
566 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
5f5a7a55 | 567 | unsigned int ucon; |
b497549a | 568 | |
5f5a7a55 TA |
569 | if (info->num_clks == 1) |
570 | return 0; | |
b497549a | 571 | |
5f5a7a55 TA |
572 | ucon = rd_regl(port, S3C2410_UCON); |
573 | ucon &= info->clksel_mask; | |
574 | return ucon >> info->clksel_shift; | |
b497549a BD |
575 | } |
576 | ||
5f5a7a55 TA |
577 | static void s3c24xx_serial_setsource(struct uart_port *port, |
578 | unsigned int clk_sel) | |
b497549a | 579 | { |
5f5a7a55 TA |
580 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); |
581 | unsigned int ucon; | |
b497549a | 582 | |
5f5a7a55 TA |
583 | if (info->num_clks == 1) |
584 | return; | |
090f848d | 585 | |
5f5a7a55 TA |
586 | ucon = rd_regl(port, S3C2410_UCON); |
587 | if ((ucon & info->clksel_mask) >> info->clksel_shift == clk_sel) | |
588 | return; | |
b497549a | 589 | |
5f5a7a55 TA |
590 | ucon &= ~info->clksel_mask; |
591 | ucon |= clk_sel << info->clksel_shift; | |
592 | wr_regl(port, S3C2410_UCON, ucon); | |
b497549a BD |
593 | } |
594 | ||
5f5a7a55 TA |
595 | static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport, |
596 | unsigned int req_baud, struct clk **best_clk, | |
597 | unsigned int *clk_num) | |
b497549a | 598 | { |
5f5a7a55 TA |
599 | struct s3c24xx_uart_info *info = ourport->info; |
600 | struct clk *clk; | |
601 | unsigned long rate; | |
602 | unsigned int cnt, baud, quot, clk_sel, best_quot = 0; | |
603 | char clkname[MAX_CLK_NAME_LENGTH]; | |
604 | int calc_deviation, deviation = (1 << 30) - 1; | |
605 | ||
606 | *best_clk = NULL; | |
607 | clk_sel = (ourport->cfg->clk_sel) ? ourport->cfg->clk_sel : | |
608 | ourport->info->def_clk_sel; | |
609 | for (cnt = 0; cnt < info->num_clks; cnt++) { | |
610 | if (!(clk_sel & (1 << cnt))) | |
611 | continue; | |
612 | ||
613 | sprintf(clkname, "clk_uart_baud%d", cnt); | |
614 | clk = clk_get(ourport->port.dev, clkname); | |
615 | if (IS_ERR_OR_NULL(clk)) | |
616 | continue; | |
617 | ||
618 | rate = clk_get_rate(clk); | |
619 | if (!rate) | |
620 | continue; | |
621 | ||
622 | if (ourport->info->has_divslot) { | |
623 | unsigned long div = rate / req_baud; | |
624 | ||
625 | /* The UDIVSLOT register on the newer UARTs allows us to | |
626 | * get a divisor adjustment of 1/16th on the baud clock. | |
627 | * | |
628 | * We don't keep the UDIVSLOT value (the 16ths we | |
629 | * calculated by not multiplying the baud by 16) as it | |
630 | * is easy enough to recalculate. | |
631 | */ | |
632 | ||
633 | quot = div / 16; | |
634 | baud = rate / div; | |
635 | } else { | |
636 | quot = (rate + (8 * req_baud)) / (16 * req_baud); | |
637 | baud = rate / (quot * 16); | |
b497549a | 638 | } |
5f5a7a55 | 639 | quot--; |
b497549a | 640 | |
5f5a7a55 TA |
641 | calc_deviation = req_baud - baud; |
642 | if (calc_deviation < 0) | |
643 | calc_deviation = -calc_deviation; | |
b497549a | 644 | |
5f5a7a55 TA |
645 | if (calc_deviation < deviation) { |
646 | *best_clk = clk; | |
647 | best_quot = quot; | |
648 | *clk_num = cnt; | |
649 | deviation = calc_deviation; | |
b497549a BD |
650 | } |
651 | } | |
652 | ||
5f5a7a55 | 653 | return best_quot; |
b497549a BD |
654 | } |
655 | ||
090f848d BD |
656 | /* udivslot_table[] |
657 | * | |
658 | * This table takes the fractional value of the baud divisor and gives | |
659 | * the recommended setting for the UDIVSLOT register. | |
660 | */ | |
661 | static u16 udivslot_table[16] = { | |
662 | [0] = 0x0000, | |
663 | [1] = 0x0080, | |
664 | [2] = 0x0808, | |
665 | [3] = 0x0888, | |
666 | [4] = 0x2222, | |
667 | [5] = 0x4924, | |
668 | [6] = 0x4A52, | |
669 | [7] = 0x54AA, | |
670 | [8] = 0x5555, | |
671 | [9] = 0xD555, | |
672 | [10] = 0xD5D5, | |
673 | [11] = 0xDDD5, | |
674 | [12] = 0xDDDD, | |
675 | [13] = 0xDFDD, | |
676 | [14] = 0xDFDF, | |
677 | [15] = 0xFFDF, | |
678 | }; | |
679 | ||
b497549a BD |
680 | static void s3c24xx_serial_set_termios(struct uart_port *port, |
681 | struct ktermios *termios, | |
682 | struct ktermios *old) | |
683 | { | |
684 | struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port); | |
685 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
b497549a BD |
686 | struct clk *clk = NULL; |
687 | unsigned long flags; | |
5f5a7a55 | 688 | unsigned int baud, quot, clk_sel = 0; |
b497549a BD |
689 | unsigned int ulcon; |
690 | unsigned int umcon; | |
090f848d | 691 | unsigned int udivslot = 0; |
b497549a BD |
692 | |
693 | /* | |
694 | * We don't support modem control lines. | |
695 | */ | |
696 | termios->c_cflag &= ~(HUPCL | CMSPAR); | |
697 | termios->c_cflag |= CLOCAL; | |
698 | ||
699 | /* | |
700 | * Ask the core to calculate the divisor for us. | |
701 | */ | |
702 | ||
703 | baud = uart_get_baud_rate(port, termios, old, 0, 115200*8); | |
5f5a7a55 | 704 | quot = s3c24xx_serial_getclk(ourport, baud, &clk, &clk_sel); |
b497549a BD |
705 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) |
706 | quot = port->custom_divisor; | |
5f5a7a55 TA |
707 | if (!clk) |
708 | return; | |
b497549a BD |
709 | |
710 | /* check to see if we need to change clock source */ | |
711 | ||
5f5a7a55 TA |
712 | if (ourport->baudclk != clk) { |
713 | s3c24xx_serial_setsource(port, clk_sel); | |
b497549a BD |
714 | |
715 | if (ourport->baudclk != NULL && !IS_ERR(ourport->baudclk)) { | |
716 | clk_disable(ourport->baudclk); | |
717 | ourport->baudclk = NULL; | |
718 | } | |
719 | ||
720 | clk_enable(clk); | |
721 | ||
b497549a | 722 | ourport->baudclk = clk; |
30555476 | 723 | ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0; |
b497549a BD |
724 | } |
725 | ||
090f848d BD |
726 | if (ourport->info->has_divslot) { |
727 | unsigned int div = ourport->baudclk_rate / baud; | |
728 | ||
8b526ae4 JL |
729 | if (cfg->has_fracval) { |
730 | udivslot = (div & 15); | |
731 | dbg("fracval = %04x\n", udivslot); | |
732 | } else { | |
733 | udivslot = udivslot_table[div & 15]; | |
734 | dbg("udivslot = %04x (div %d)\n", udivslot, div & 15); | |
735 | } | |
090f848d BD |
736 | } |
737 | ||
b497549a BD |
738 | switch (termios->c_cflag & CSIZE) { |
739 | case CS5: | |
740 | dbg("config: 5bits/char\n"); | |
741 | ulcon = S3C2410_LCON_CS5; | |
742 | break; | |
743 | case CS6: | |
744 | dbg("config: 6bits/char\n"); | |
745 | ulcon = S3C2410_LCON_CS6; | |
746 | break; | |
747 | case CS7: | |
748 | dbg("config: 7bits/char\n"); | |
749 | ulcon = S3C2410_LCON_CS7; | |
750 | break; | |
751 | case CS8: | |
752 | default: | |
753 | dbg("config: 8bits/char\n"); | |
754 | ulcon = S3C2410_LCON_CS8; | |
755 | break; | |
756 | } | |
757 | ||
758 | /* preserve original lcon IR settings */ | |
759 | ulcon |= (cfg->ulcon & S3C2410_LCON_IRM); | |
760 | ||
761 | if (termios->c_cflag & CSTOPB) | |
762 | ulcon |= S3C2410_LCON_STOPB; | |
763 | ||
764 | umcon = (termios->c_cflag & CRTSCTS) ? S3C2410_UMCOM_AFC : 0; | |
765 | ||
766 | if (termios->c_cflag & PARENB) { | |
767 | if (termios->c_cflag & PARODD) | |
768 | ulcon |= S3C2410_LCON_PODD; | |
769 | else | |
770 | ulcon |= S3C2410_LCON_PEVEN; | |
771 | } else { | |
772 | ulcon |= S3C2410_LCON_PNONE; | |
773 | } | |
774 | ||
775 | spin_lock_irqsave(&port->lock, flags); | |
776 | ||
090f848d BD |
777 | dbg("setting ulcon to %08x, brddiv to %d, udivslot %08x\n", |
778 | ulcon, quot, udivslot); | |
b497549a BD |
779 | |
780 | wr_regl(port, S3C2410_ULCON, ulcon); | |
781 | wr_regl(port, S3C2410_UBRDIV, quot); | |
782 | wr_regl(port, S3C2410_UMCON, umcon); | |
783 | ||
090f848d BD |
784 | if (ourport->info->has_divslot) |
785 | wr_regl(port, S3C2443_DIVSLOT, udivslot); | |
786 | ||
b497549a BD |
787 | dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n", |
788 | rd_regl(port, S3C2410_ULCON), | |
789 | rd_regl(port, S3C2410_UCON), | |
790 | rd_regl(port, S3C2410_UFCON)); | |
791 | ||
792 | /* | |
793 | * Update the per-port timeout. | |
794 | */ | |
795 | uart_update_timeout(port, termios->c_cflag, baud); | |
796 | ||
797 | /* | |
798 | * Which character status flags are we interested in? | |
799 | */ | |
800 | port->read_status_mask = S3C2410_UERSTAT_OVERRUN; | |
801 | if (termios->c_iflag & INPCK) | |
802 | port->read_status_mask |= S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_PARITY; | |
803 | ||
804 | /* | |
805 | * Which character status flags should we ignore? | |
806 | */ | |
807 | port->ignore_status_mask = 0; | |
808 | if (termios->c_iflag & IGNPAR) | |
809 | port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN; | |
810 | if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR) | |
811 | port->ignore_status_mask |= S3C2410_UERSTAT_FRAME; | |
812 | ||
813 | /* | |
814 | * Ignore all characters if CREAD is not set. | |
815 | */ | |
816 | if ((termios->c_cflag & CREAD) == 0) | |
817 | port->ignore_status_mask |= RXSTAT_DUMMY_READ; | |
818 | ||
819 | spin_unlock_irqrestore(&port->lock, flags); | |
820 | } | |
821 | ||
822 | static const char *s3c24xx_serial_type(struct uart_port *port) | |
823 | { | |
824 | switch (port->type) { | |
825 | case PORT_S3C2410: | |
826 | return "S3C2410"; | |
827 | case PORT_S3C2440: | |
828 | return "S3C2440"; | |
829 | case PORT_S3C2412: | |
830 | return "S3C2412"; | |
b690ace5 BD |
831 | case PORT_S3C6400: |
832 | return "S3C6400/10"; | |
b497549a BD |
833 | default: |
834 | return NULL; | |
835 | } | |
836 | } | |
837 | ||
838 | #define MAP_SIZE (0x100) | |
839 | ||
840 | static void s3c24xx_serial_release_port(struct uart_port *port) | |
841 | { | |
842 | release_mem_region(port->mapbase, MAP_SIZE); | |
843 | } | |
844 | ||
845 | static int s3c24xx_serial_request_port(struct uart_port *port) | |
846 | { | |
847 | const char *name = s3c24xx_serial_portname(port); | |
848 | return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY; | |
849 | } | |
850 | ||
851 | static void s3c24xx_serial_config_port(struct uart_port *port, int flags) | |
852 | { | |
853 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
854 | ||
855 | if (flags & UART_CONFIG_TYPE && | |
856 | s3c24xx_serial_request_port(port) == 0) | |
857 | port->type = info->type; | |
858 | } | |
859 | ||
860 | /* | |
861 | * verify the new serial_struct (for TIOCSSERIAL). | |
862 | */ | |
863 | static int | |
864 | s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser) | |
865 | { | |
866 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
867 | ||
868 | if (ser->type != PORT_UNKNOWN && ser->type != info->type) | |
869 | return -EINVAL; | |
870 | ||
871 | return 0; | |
872 | } | |
873 | ||
874 | ||
875 | #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE | |
876 | ||
877 | static struct console s3c24xx_serial_console; | |
878 | ||
879 | #define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console | |
880 | #else | |
881 | #define S3C24XX_SERIAL_CONSOLE NULL | |
882 | #endif | |
883 | ||
884 | static struct uart_ops s3c24xx_serial_ops = { | |
885 | .pm = s3c24xx_serial_pm, | |
886 | .tx_empty = s3c24xx_serial_tx_empty, | |
887 | .get_mctrl = s3c24xx_serial_get_mctrl, | |
888 | .set_mctrl = s3c24xx_serial_set_mctrl, | |
889 | .stop_tx = s3c24xx_serial_stop_tx, | |
890 | .start_tx = s3c24xx_serial_start_tx, | |
891 | .stop_rx = s3c24xx_serial_stop_rx, | |
892 | .enable_ms = s3c24xx_serial_enable_ms, | |
893 | .break_ctl = s3c24xx_serial_break_ctl, | |
894 | .startup = s3c24xx_serial_startup, | |
895 | .shutdown = s3c24xx_serial_shutdown, | |
896 | .set_termios = s3c24xx_serial_set_termios, | |
897 | .type = s3c24xx_serial_type, | |
898 | .release_port = s3c24xx_serial_release_port, | |
899 | .request_port = s3c24xx_serial_request_port, | |
900 | .config_port = s3c24xx_serial_config_port, | |
901 | .verify_port = s3c24xx_serial_verify_port, | |
902 | }; | |
903 | ||
b497549a BD |
904 | static struct uart_driver s3c24xx_uart_drv = { |
905 | .owner = THIS_MODULE, | |
2cf0c58e | 906 | .driver_name = "s3c2410_serial", |
bdd4915a | 907 | .nr = CONFIG_SERIAL_SAMSUNG_UARTS, |
b497549a | 908 | .cons = S3C24XX_SERIAL_CONSOLE, |
2cf0c58e | 909 | .dev_name = S3C24XX_SERIAL_NAME, |
b497549a BD |
910 | .major = S3C24XX_SERIAL_MAJOR, |
911 | .minor = S3C24XX_SERIAL_MINOR, | |
912 | }; | |
913 | ||
03d5e77b | 914 | static struct s3c24xx_uart_port s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = { |
b497549a BD |
915 | [0] = { |
916 | .port = { | |
917 | .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[0].port.lock), | |
918 | .iotype = UPIO_MEM, | |
b497549a BD |
919 | .uartclk = 0, |
920 | .fifosize = 16, | |
921 | .ops = &s3c24xx_serial_ops, | |
922 | .flags = UPF_BOOT_AUTOCONF, | |
923 | .line = 0, | |
924 | } | |
925 | }, | |
926 | [1] = { | |
927 | .port = { | |
928 | .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[1].port.lock), | |
929 | .iotype = UPIO_MEM, | |
b497549a BD |
930 | .uartclk = 0, |
931 | .fifosize = 16, | |
932 | .ops = &s3c24xx_serial_ops, | |
933 | .flags = UPF_BOOT_AUTOCONF, | |
934 | .line = 1, | |
935 | } | |
936 | }, | |
03d5e77b | 937 | #if CONFIG_SERIAL_SAMSUNG_UARTS > 2 |
b497549a BD |
938 | |
939 | [2] = { | |
940 | .port = { | |
941 | .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[2].port.lock), | |
942 | .iotype = UPIO_MEM, | |
b497549a BD |
943 | .uartclk = 0, |
944 | .fifosize = 16, | |
945 | .ops = &s3c24xx_serial_ops, | |
946 | .flags = UPF_BOOT_AUTOCONF, | |
947 | .line = 2, | |
948 | } | |
03d5e77b BD |
949 | }, |
950 | #endif | |
951 | #if CONFIG_SERIAL_SAMSUNG_UARTS > 3 | |
952 | [3] = { | |
953 | .port = { | |
954 | .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[3].port.lock), | |
955 | .iotype = UPIO_MEM, | |
03d5e77b BD |
956 | .uartclk = 0, |
957 | .fifosize = 16, | |
958 | .ops = &s3c24xx_serial_ops, | |
959 | .flags = UPF_BOOT_AUTOCONF, | |
960 | .line = 3, | |
961 | } | |
b497549a BD |
962 | } |
963 | #endif | |
964 | }; | |
965 | ||
966 | /* s3c24xx_serial_resetport | |
967 | * | |
968 | * wrapper to call the specific reset for this port (reset the fifos | |
969 | * and the settings) | |
970 | */ | |
971 | ||
972 | static inline int s3c24xx_serial_resetport(struct uart_port *port, | |
973 | struct s3c2410_uartcfg *cfg) | |
974 | { | |
975 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
976 | ||
977 | return (info->reset_port)(port, cfg); | |
978 | } | |
979 | ||
30555476 BD |
980 | |
981 | #ifdef CONFIG_CPU_FREQ | |
982 | ||
983 | static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb, | |
984 | unsigned long val, void *data) | |
985 | { | |
986 | struct s3c24xx_uart_port *port; | |
987 | struct uart_port *uport; | |
988 | ||
989 | port = container_of(nb, struct s3c24xx_uart_port, freq_transition); | |
990 | uport = &port->port; | |
991 | ||
992 | /* check to see if port is enabled */ | |
993 | ||
994 | if (port->pm_level != 0) | |
995 | return 0; | |
996 | ||
997 | /* try and work out if the baudrate is changing, we can detect | |
998 | * a change in rate, but we do not have support for detecting | |
999 | * a disturbance in the clock-rate over the change. | |
1000 | */ | |
1001 | ||
1002 | if (IS_ERR(port->clk)) | |
1003 | goto exit; | |
1004 | ||
1005 | if (port->baudclk_rate == clk_get_rate(port->clk)) | |
1006 | goto exit; | |
1007 | ||
1008 | if (val == CPUFREQ_PRECHANGE) { | |
1009 | /* we should really shut the port down whilst the | |
1010 | * frequency change is in progress. */ | |
1011 | ||
1012 | } else if (val == CPUFREQ_POSTCHANGE) { | |
1013 | struct ktermios *termios; | |
1014 | struct tty_struct *tty; | |
1015 | ||
ebd2c8f6 | 1016 | if (uport->state == NULL) |
30555476 | 1017 | goto exit; |
30555476 | 1018 | |
ebd2c8f6 | 1019 | tty = uport->state->port.tty; |
30555476 | 1020 | |
7de40c21 | 1021 | if (tty == NULL) |
30555476 | 1022 | goto exit; |
30555476 BD |
1023 | |
1024 | termios = tty->termios; | |
1025 | ||
1026 | if (termios == NULL) { | |
1027 | printk(KERN_WARNING "%s: no termios?\n", __func__); | |
1028 | goto exit; | |
1029 | } | |
1030 | ||
1031 | s3c24xx_serial_set_termios(uport, termios, NULL); | |
1032 | } | |
1033 | ||
1034 | exit: | |
1035 | return 0; | |
1036 | } | |
1037 | ||
1038 | static inline int s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port) | |
1039 | { | |
1040 | port->freq_transition.notifier_call = s3c24xx_serial_cpufreq_transition; | |
1041 | ||
1042 | return cpufreq_register_notifier(&port->freq_transition, | |
1043 | CPUFREQ_TRANSITION_NOTIFIER); | |
1044 | } | |
1045 | ||
1046 | static inline void s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port) | |
1047 | { | |
1048 | cpufreq_unregister_notifier(&port->freq_transition, | |
1049 | CPUFREQ_TRANSITION_NOTIFIER); | |
1050 | } | |
1051 | ||
1052 | #else | |
1053 | static inline int s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port) | |
1054 | { | |
1055 | return 0; | |
1056 | } | |
1057 | ||
1058 | static inline void s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port) | |
1059 | { | |
1060 | } | |
1061 | #endif | |
1062 | ||
b497549a BD |
1063 | /* s3c24xx_serial_init_port |
1064 | * | |
1065 | * initialise a single serial port from the platform device given | |
1066 | */ | |
1067 | ||
1068 | static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport, | |
1069 | struct s3c24xx_uart_info *info, | |
1070 | struct platform_device *platdev) | |
1071 | { | |
1072 | struct uart_port *port = &ourport->port; | |
4d84e970 | 1073 | struct s3c2410_uartcfg *cfg = platdev->dev.platform_data; |
b497549a BD |
1074 | struct resource *res; |
1075 | int ret; | |
1076 | ||
1077 | dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev); | |
1078 | ||
1079 | if (platdev == NULL) | |
1080 | return -ENODEV; | |
1081 | ||
b497549a BD |
1082 | if (port->mapbase != 0) |
1083 | return 0; | |
1084 | ||
4d84e970 TA |
1085 | /* |
1086 | * If platform data is supplied, keep a copy of the location of | |
1087 | * platform data in the driver's private data. | |
1088 | */ | |
1089 | if (cfg) | |
1090 | ourport->cfg = cfg; | |
1091 | ||
bdd4915a BD |
1092 | if (cfg->hwport > CONFIG_SERIAL_SAMSUNG_UARTS) { |
1093 | printk(KERN_ERR "%s: port %d bigger than %d\n", __func__, | |
1094 | cfg->hwport, CONFIG_SERIAL_SAMSUNG_UARTS); | |
1095 | return -ERANGE; | |
1096 | } | |
b497549a BD |
1097 | |
1098 | /* setup info for port */ | |
1099 | port->dev = &platdev->dev; | |
1100 | ourport->info = info; | |
1101 | ||
88bb4ea1 TA |
1102 | /* Startup sequence is different for s3c64xx and higher SoC's */ |
1103 | if (s3c24xx_serial_has_interrupt_mask(port)) | |
1104 | s3c24xx_serial_ops.startup = s3c64xx_serial_startup; | |
1105 | ||
b497549a BD |
1106 | /* copy the info in from provided structure */ |
1107 | ourport->port.fifosize = info->fifosize; | |
1108 | ||
1109 | dbg("s3c24xx_serial_init_port: %p (hw %d)...\n", port, cfg->hwport); | |
1110 | ||
1111 | port->uartclk = 1; | |
1112 | ||
1113 | if (cfg->uart_flags & UPF_CONS_FLOW) { | |
1114 | dbg("s3c24xx_serial_init_port: enabling flow control\n"); | |
1115 | port->flags |= UPF_CONS_FLOW; | |
1116 | } | |
1117 | ||
1118 | /* sort our the physical and virtual addresses for each UART */ | |
1119 | ||
1120 | res = platform_get_resource(platdev, IORESOURCE_MEM, 0); | |
1121 | if (res == NULL) { | |
1122 | printk(KERN_ERR "failed to find memory resource for uart\n"); | |
1123 | return -EINVAL; | |
1124 | } | |
1125 | ||
1126 | dbg("resource %p (%lx..%lx)\n", res, res->start, res->end); | |
1127 | ||
b690ace5 | 1128 | port->mapbase = res->start; |
2555e663 | 1129 | port->membase = S3C_VA_UART + (res->start & 0xfffff); |
b497549a BD |
1130 | ret = platform_get_irq(platdev, 0); |
1131 | if (ret < 0) | |
1132 | port->irq = 0; | |
b73c289c | 1133 | else { |
b497549a | 1134 | port->irq = ret; |
b73c289c BD |
1135 | ourport->rx_irq = ret; |
1136 | ourport->tx_irq = ret + 1; | |
1137 | } | |
1138 | ||
1139 | ret = platform_get_irq(platdev, 1); | |
1140 | if (ret > 0) | |
1141 | ourport->tx_irq = ret; | |
b497549a BD |
1142 | |
1143 | ourport->clk = clk_get(&platdev->dev, "uart"); | |
1144 | ||
88bb4ea1 TA |
1145 | /* Keep all interrupts masked and cleared */ |
1146 | if (s3c24xx_serial_has_interrupt_mask(port)) { | |
1147 | wr_regl(port, S3C64XX_UINTM, 0xf); | |
1148 | wr_regl(port, S3C64XX_UINTP, 0xf); | |
1149 | wr_regl(port, S3C64XX_UINTSP, 0xf); | |
1150 | } | |
1151 | ||
b73c289c BD |
1152 | dbg("port: map=%08x, mem=%08x, irq=%d (%d,%d), clock=%ld\n", |
1153 | port->mapbase, port->membase, port->irq, | |
1154 | ourport->rx_irq, ourport->tx_irq, port->uartclk); | |
b497549a BD |
1155 | |
1156 | /* reset the fifos (and setup the uart) */ | |
1157 | s3c24xx_serial_resetport(port, cfg); | |
1158 | return 0; | |
1159 | } | |
1160 | ||
1161 | static ssize_t s3c24xx_serial_show_clksrc(struct device *dev, | |
1162 | struct device_attribute *attr, | |
1163 | char *buf) | |
1164 | { | |
1165 | struct uart_port *port = s3c24xx_dev_to_port(dev); | |
1166 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
1167 | ||
5f5a7a55 | 1168 | return snprintf(buf, PAGE_SIZE, "* %s\n", ourport->baudclk->name); |
b497549a BD |
1169 | } |
1170 | ||
1171 | static DEVICE_ATTR(clock_source, S_IRUGO, s3c24xx_serial_show_clksrc, NULL); | |
1172 | ||
1173 | /* Device driver serial port probe */ | |
1174 | ||
1175 | static int probe_index; | |
1176 | ||
1177 | int s3c24xx_serial_probe(struct platform_device *dev, | |
1178 | struct s3c24xx_uart_info *info) | |
1179 | { | |
1180 | struct s3c24xx_uart_port *ourport; | |
1181 | int ret; | |
1182 | ||
1183 | dbg("s3c24xx_serial_probe(%p, %p) %d\n", dev, info, probe_index); | |
1184 | ||
1185 | ourport = &s3c24xx_serial_ports[probe_index]; | |
1186 | probe_index++; | |
1187 | ||
1188 | dbg("%s: initialising port %p...\n", __func__, ourport); | |
1189 | ||
1190 | ret = s3c24xx_serial_init_port(ourport, info, dev); | |
1191 | if (ret < 0) | |
1192 | goto probe_err; | |
1193 | ||
1194 | dbg("%s: adding port\n", __func__); | |
1195 | uart_add_one_port(&s3c24xx_uart_drv, &ourport->port); | |
1196 | platform_set_drvdata(dev, &ourport->port); | |
1197 | ||
1198 | ret = device_create_file(&dev->dev, &dev_attr_clock_source); | |
1199 | if (ret < 0) | |
1200 | printk(KERN_ERR "%s: failed to add clksrc attr.\n", __func__); | |
1201 | ||
30555476 BD |
1202 | ret = s3c24xx_serial_cpufreq_register(ourport); |
1203 | if (ret < 0) | |
1204 | dev_err(&dev->dev, "failed to add cpufreq notifier\n"); | |
1205 | ||
b497549a BD |
1206 | return 0; |
1207 | ||
1208 | probe_err: | |
1209 | return ret; | |
1210 | } | |
1211 | ||
1212 | EXPORT_SYMBOL_GPL(s3c24xx_serial_probe); | |
1213 | ||
90ceb964 | 1214 | int __devexit s3c24xx_serial_remove(struct platform_device *dev) |
b497549a BD |
1215 | { |
1216 | struct uart_port *port = s3c24xx_dev_to_port(&dev->dev); | |
1217 | ||
1218 | if (port) { | |
30555476 | 1219 | s3c24xx_serial_cpufreq_deregister(to_ourport(port)); |
b497549a BD |
1220 | device_remove_file(&dev->dev, &dev_attr_clock_source); |
1221 | uart_remove_one_port(&s3c24xx_uart_drv, port); | |
1222 | } | |
1223 | ||
1224 | return 0; | |
1225 | } | |
1226 | ||
1227 | EXPORT_SYMBOL_GPL(s3c24xx_serial_remove); | |
1228 | ||
1229 | /* UART power management code */ | |
aef7fe52 MH |
1230 | #ifdef CONFIG_PM_SLEEP |
1231 | static int s3c24xx_serial_suspend(struct device *dev) | |
b497549a | 1232 | { |
aef7fe52 | 1233 | struct uart_port *port = s3c24xx_dev_to_port(dev); |
b497549a BD |
1234 | |
1235 | if (port) | |
1236 | uart_suspend_port(&s3c24xx_uart_drv, port); | |
1237 | ||
1238 | return 0; | |
1239 | } | |
1240 | ||
aef7fe52 | 1241 | static int s3c24xx_serial_resume(struct device *dev) |
b497549a | 1242 | { |
aef7fe52 | 1243 | struct uart_port *port = s3c24xx_dev_to_port(dev); |
b497549a BD |
1244 | struct s3c24xx_uart_port *ourport = to_ourport(port); |
1245 | ||
1246 | if (port) { | |
1247 | clk_enable(ourport->clk); | |
1248 | s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port)); | |
1249 | clk_disable(ourport->clk); | |
1250 | ||
1251 | uart_resume_port(&s3c24xx_uart_drv, port); | |
1252 | } | |
1253 | ||
1254 | return 0; | |
1255 | } | |
aef7fe52 MH |
1256 | |
1257 | static const struct dev_pm_ops s3c24xx_serial_pm_ops = { | |
1258 | .suspend = s3c24xx_serial_suspend, | |
1259 | .resume = s3c24xx_serial_resume, | |
1260 | }; | |
b882fc1b KK |
1261 | #define SERIAL_SAMSUNG_PM_OPS (&s3c24xx_serial_pm_ops) |
1262 | ||
aef7fe52 | 1263 | #else /* !CONFIG_PM_SLEEP */ |
b882fc1b KK |
1264 | |
1265 | #define SERIAL_SAMSUNG_PM_OPS NULL | |
aef7fe52 | 1266 | #endif /* CONFIG_PM_SLEEP */ |
b497549a BD |
1267 | |
1268 | int s3c24xx_serial_init(struct platform_driver *drv, | |
1269 | struct s3c24xx_uart_info *info) | |
1270 | { | |
1271 | dbg("s3c24xx_serial_init(%p,%p)\n", drv, info); | |
b882fc1b KK |
1272 | |
1273 | drv->driver.pm = SERIAL_SAMSUNG_PM_OPS; | |
b497549a BD |
1274 | |
1275 | return platform_driver_register(drv); | |
1276 | } | |
1277 | ||
1278 | EXPORT_SYMBOL_GPL(s3c24xx_serial_init); | |
1279 | ||
1280 | /* module initialisation code */ | |
1281 | ||
1282 | static int __init s3c24xx_serial_modinit(void) | |
1283 | { | |
1284 | int ret; | |
1285 | ||
1286 | ret = uart_register_driver(&s3c24xx_uart_drv); | |
1287 | if (ret < 0) { | |
1288 | printk(KERN_ERR "failed to register UART driver\n"); | |
1289 | return -1; | |
1290 | } | |
1291 | ||
1292 | return 0; | |
1293 | } | |
1294 | ||
1295 | static void __exit s3c24xx_serial_modexit(void) | |
1296 | { | |
1297 | uart_unregister_driver(&s3c24xx_uart_drv); | |
1298 | } | |
1299 | ||
1300 | module_init(s3c24xx_serial_modinit); | |
1301 | module_exit(s3c24xx_serial_modexit); | |
1302 | ||
1303 | /* Console code */ | |
1304 | ||
1305 | #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE | |
1306 | ||
1307 | static struct uart_port *cons_uart; | |
1308 | ||
1309 | static int | |
1310 | s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon) | |
1311 | { | |
1312 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
1313 | unsigned long ufstat, utrstat; | |
1314 | ||
1315 | if (ufcon & S3C2410_UFCON_FIFOMODE) { | |
9ddc5b6f | 1316 | /* fifo mode - check amount of data in fifo registers... */ |
b497549a BD |
1317 | |
1318 | ufstat = rd_regl(port, S3C2410_UFSTAT); | |
1319 | return (ufstat & info->tx_fifofull) ? 0 : 1; | |
1320 | } | |
1321 | ||
1322 | /* in non-fifo mode, we go and use the tx buffer empty */ | |
1323 | ||
1324 | utrstat = rd_regl(port, S3C2410_UTRSTAT); | |
1325 | return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0; | |
1326 | } | |
1327 | ||
1328 | static void | |
1329 | s3c24xx_serial_console_putchar(struct uart_port *port, int ch) | |
1330 | { | |
1331 | unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON); | |
1332 | while (!s3c24xx_serial_console_txrdy(port, ufcon)) | |
1333 | barrier(); | |
1334 | wr_regb(cons_uart, S3C2410_UTXH, ch); | |
1335 | } | |
1336 | ||
1337 | static void | |
1338 | s3c24xx_serial_console_write(struct console *co, const char *s, | |
1339 | unsigned int count) | |
1340 | { | |
1341 | uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar); | |
1342 | } | |
1343 | ||
1344 | static void __init | |
1345 | s3c24xx_serial_get_options(struct uart_port *port, int *baud, | |
1346 | int *parity, int *bits) | |
1347 | { | |
b497549a BD |
1348 | struct clk *clk; |
1349 | unsigned int ulcon; | |
1350 | unsigned int ucon; | |
1351 | unsigned int ubrdiv; | |
1352 | unsigned long rate; | |
5f5a7a55 TA |
1353 | unsigned int clk_sel; |
1354 | char clk_name[MAX_CLK_NAME_LENGTH]; | |
b497549a BD |
1355 | |
1356 | ulcon = rd_regl(port, S3C2410_ULCON); | |
1357 | ucon = rd_regl(port, S3C2410_UCON); | |
1358 | ubrdiv = rd_regl(port, S3C2410_UBRDIV); | |
1359 | ||
1360 | dbg("s3c24xx_serial_get_options: port=%p\n" | |
1361 | "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n", | |
1362 | port, ulcon, ucon, ubrdiv); | |
1363 | ||
1364 | if ((ucon & 0xf) != 0) { | |
1365 | /* consider the serial port configured if the tx/rx mode set */ | |
1366 | ||
1367 | switch (ulcon & S3C2410_LCON_CSMASK) { | |
1368 | case S3C2410_LCON_CS5: | |
1369 | *bits = 5; | |
1370 | break; | |
1371 | case S3C2410_LCON_CS6: | |
1372 | *bits = 6; | |
1373 | break; | |
1374 | case S3C2410_LCON_CS7: | |
1375 | *bits = 7; | |
1376 | break; | |
1377 | default: | |
1378 | case S3C2410_LCON_CS8: | |
1379 | *bits = 8; | |
1380 | break; | |
1381 | } | |
1382 | ||
1383 | switch (ulcon & S3C2410_LCON_PMASK) { | |
1384 | case S3C2410_LCON_PEVEN: | |
1385 | *parity = 'e'; | |
1386 | break; | |
1387 | ||
1388 | case S3C2410_LCON_PODD: | |
1389 | *parity = 'o'; | |
1390 | break; | |
1391 | ||
1392 | case S3C2410_LCON_PNONE: | |
1393 | default: | |
1394 | *parity = 'n'; | |
1395 | } | |
1396 | ||
1397 | /* now calculate the baud rate */ | |
1398 | ||
5f5a7a55 TA |
1399 | clk_sel = s3c24xx_serial_getsource(port); |
1400 | sprintf(clk_name, "clk_uart_baud%d", clk_sel); | |
b497549a | 1401 | |
5f5a7a55 | 1402 | clk = clk_get(port->dev, clk_name); |
b497549a | 1403 | if (!IS_ERR(clk) && clk != NULL) |
5f5a7a55 | 1404 | rate = clk_get_rate(clk); |
b497549a BD |
1405 | else |
1406 | rate = 1; | |
1407 | ||
1408 | ||
1409 | *baud = rate / (16 * (ubrdiv + 1)); | |
1410 | dbg("calculated baud %d\n", *baud); | |
1411 | } | |
1412 | ||
1413 | } | |
1414 | ||
1415 | /* s3c24xx_serial_init_ports | |
1416 | * | |
1417 | * initialise the serial ports from the machine provided initialisation | |
1418 | * data. | |
1419 | */ | |
1420 | ||
51fe5222 | 1421 | static int s3c24xx_serial_init_ports(struct s3c24xx_uart_info **info) |
b497549a BD |
1422 | { |
1423 | struct s3c24xx_uart_port *ptr = s3c24xx_serial_ports; | |
1424 | struct platform_device **platdev_ptr; | |
1425 | int i; | |
1426 | ||
1427 | dbg("s3c24xx_serial_init_ports: initialising ports...\n"); | |
1428 | ||
1429 | platdev_ptr = s3c24xx_uart_devs; | |
1430 | ||
03d5e77b | 1431 | for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++, ptr++, platdev_ptr++) { |
51fe5222 | 1432 | s3c24xx_serial_init_port(ptr, info[i], *platdev_ptr); |
b497549a BD |
1433 | } |
1434 | ||
1435 | return 0; | |
1436 | } | |
1437 | ||
1438 | static int __init | |
1439 | s3c24xx_serial_console_setup(struct console *co, char *options) | |
1440 | { | |
1441 | struct uart_port *port; | |
1442 | int baud = 9600; | |
1443 | int bits = 8; | |
1444 | int parity = 'n'; | |
1445 | int flow = 'n'; | |
1446 | ||
1447 | dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n", | |
1448 | co, co->index, options); | |
1449 | ||
1450 | /* is this a valid port */ | |
1451 | ||
03d5e77b | 1452 | if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS) |
b497549a BD |
1453 | co->index = 0; |
1454 | ||
1455 | port = &s3c24xx_serial_ports[co->index].port; | |
1456 | ||
1457 | /* is the port configured? */ | |
1458 | ||
ee430f16 TA |
1459 | if (port->mapbase == 0x0) |
1460 | return -ENODEV; | |
b497549a BD |
1461 | |
1462 | cons_uart = port; | |
1463 | ||
1464 | dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index); | |
1465 | ||
1466 | /* | |
1467 | * Check whether an invalid uart number has been specified, and | |
1468 | * if so, search for the first available port that does have | |
1469 | * console support. | |
1470 | */ | |
1471 | if (options) | |
1472 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
1473 | else | |
1474 | s3c24xx_serial_get_options(port, &baud, &parity, &bits); | |
1475 | ||
1476 | dbg("s3c24xx_serial_console_setup: baud %d\n", baud); | |
1477 | ||
1478 | return uart_set_options(port, co, baud, parity, bits, flow); | |
1479 | } | |
1480 | ||
1481 | /* s3c24xx_serial_initconsole | |
1482 | * | |
1483 | * initialise the console from one of the uart drivers | |
1484 | */ | |
1485 | ||
1486 | static struct console s3c24xx_serial_console = { | |
1487 | .name = S3C24XX_SERIAL_NAME, | |
1488 | .device = uart_console_device, | |
1489 | .flags = CON_PRINTBUFFER, | |
1490 | .index = -1, | |
1491 | .write = s3c24xx_serial_console_write, | |
5822a5df TA |
1492 | .setup = s3c24xx_serial_console_setup, |
1493 | .data = &s3c24xx_uart_drv, | |
b497549a BD |
1494 | }; |
1495 | ||
1496 | int s3c24xx_serial_initconsole(struct platform_driver *drv, | |
51fe5222 | 1497 | struct s3c24xx_uart_info **info) |
b497549a BD |
1498 | |
1499 | { | |
1500 | struct platform_device *dev = s3c24xx_uart_devs[0]; | |
1501 | ||
1502 | dbg("s3c24xx_serial_initconsole\n"); | |
1503 | ||
1504 | /* select driver based on the cpu */ | |
1505 | ||
1506 | if (dev == NULL) { | |
1507 | printk(KERN_ERR "s3c24xx: no devices for console init\n"); | |
1508 | return 0; | |
1509 | } | |
1510 | ||
1511 | if (strcmp(dev->name, drv->driver.name) != 0) | |
1512 | return 0; | |
1513 | ||
1514 | s3c24xx_serial_console.data = &s3c24xx_uart_drv; | |
1515 | s3c24xx_serial_init_ports(info); | |
1516 | ||
1517 | register_console(&s3c24xx_serial_console); | |
1518 | return 0; | |
1519 | } | |
1520 | ||
1521 | #endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */ | |
1522 | ||
1523 | MODULE_DESCRIPTION("Samsung SoC Serial port driver"); | |
1524 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); | |
1525 | MODULE_LICENSE("GPL v2"); |