Commit | Line | Data |
---|---|---|
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> | |
9ee51f01 | 42 | #include <linux/serial_s3c.h> |
b497549a BD |
43 | #include <linux/delay.h> |
44 | #include <linux/clk.h> | |
30555476 | 45 | #include <linux/cpufreq.h> |
26c919e1 | 46 | #include <linux/of.h> |
b497549a BD |
47 | |
48 | #include <asm/irq.h> | |
49 | ||
b497549a BD |
50 | #include "samsung.h" |
51 | ||
e4ac92df JP |
52 | #if defined(CONFIG_SERIAL_SAMSUNG_DEBUG) && \ |
53 | defined(CONFIG_DEBUG_LL) && \ | |
54 | !defined(MODULE) | |
55 | ||
56 | extern void printascii(const char *); | |
57 | ||
58 | __printf(1, 2) | |
59 | static void dbg(const char *fmt, ...) | |
60 | { | |
61 | va_list va; | |
62 | char buff[256]; | |
63 | ||
64 | va_start(va, fmt); | |
a859c8b2 | 65 | vscnprintf(buff, sizeof(buff), fmt, va); |
e4ac92df JP |
66 | va_end(va); |
67 | ||
68 | printascii(buff); | |
69 | } | |
70 | ||
71 | #else | |
72 | #define dbg(fmt, ...) do { if (0) no_printk(fmt, ##__VA_ARGS__); } while (0) | |
73 | #endif | |
74 | ||
b497549a BD |
75 | /* UART name and device definitions */ |
76 | ||
77 | #define S3C24XX_SERIAL_NAME "ttySAC" | |
78 | #define S3C24XX_SERIAL_MAJOR 204 | |
79 | #define S3C24XX_SERIAL_MINOR 64 | |
80 | ||
b497549a BD |
81 | /* macros to change one thing to another */ |
82 | ||
83 | #define tx_enabled(port) ((port)->unused[0]) | |
84 | #define rx_enabled(port) ((port)->unused[1]) | |
85 | ||
25985edc | 86 | /* flag to ignore all characters coming in */ |
b497549a BD |
87 | #define RXSTAT_DUMMY_READ (0x10000000) |
88 | ||
89 | static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port) | |
90 | { | |
91 | return container_of(port, struct s3c24xx_uart_port, port); | |
92 | } | |
93 | ||
94 | /* translate a port to the device name */ | |
95 | ||
96 | static inline const char *s3c24xx_serial_portname(struct uart_port *port) | |
97 | { | |
98 | return to_platform_device(port->dev)->name; | |
99 | } | |
100 | ||
101 | static int s3c24xx_serial_txempty_nofifo(struct uart_port *port) | |
102 | { | |
9303ac15 | 103 | return rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE; |
b497549a BD |
104 | } |
105 | ||
88bb4ea1 TA |
106 | /* |
107 | * s3c64xx and later SoC's include the interrupt mask and status registers in | |
108 | * the controller itself, unlike the s3c24xx SoC's which have these registers | |
109 | * in the interrupt controller. Check if the port type is s3c64xx or higher. | |
110 | */ | |
111 | static int s3c24xx_serial_has_interrupt_mask(struct uart_port *port) | |
112 | { | |
113 | return to_ourport(port)->info->type == PORT_S3C6400; | |
114 | } | |
115 | ||
b497549a BD |
116 | static void s3c24xx_serial_rx_enable(struct uart_port *port) |
117 | { | |
118 | unsigned long flags; | |
119 | unsigned int ucon, ufcon; | |
120 | int count = 10000; | |
121 | ||
122 | spin_lock_irqsave(&port->lock, flags); | |
123 | ||
124 | while (--count && !s3c24xx_serial_txempty_nofifo(port)) | |
125 | udelay(100); | |
126 | ||
127 | ufcon = rd_regl(port, S3C2410_UFCON); | |
128 | ufcon |= S3C2410_UFCON_RESETRX; | |
129 | wr_regl(port, S3C2410_UFCON, ufcon); | |
130 | ||
131 | ucon = rd_regl(port, S3C2410_UCON); | |
132 | ucon |= S3C2410_UCON_RXIRQMODE; | |
133 | wr_regl(port, S3C2410_UCON, ucon); | |
134 | ||
135 | rx_enabled(port) = 1; | |
136 | spin_unlock_irqrestore(&port->lock, flags); | |
137 | } | |
138 | ||
139 | static void s3c24xx_serial_rx_disable(struct uart_port *port) | |
140 | { | |
141 | unsigned long flags; | |
142 | unsigned int ucon; | |
143 | ||
144 | spin_lock_irqsave(&port->lock, flags); | |
145 | ||
146 | ucon = rd_regl(port, S3C2410_UCON); | |
147 | ucon &= ~S3C2410_UCON_RXIRQMODE; | |
148 | wr_regl(port, S3C2410_UCON, ucon); | |
149 | ||
150 | rx_enabled(port) = 0; | |
151 | spin_unlock_irqrestore(&port->lock, flags); | |
152 | } | |
153 | ||
154 | static void s3c24xx_serial_stop_tx(struct uart_port *port) | |
155 | { | |
b73c289c BD |
156 | struct s3c24xx_uart_port *ourport = to_ourport(port); |
157 | ||
b497549a | 158 | if (tx_enabled(port)) { |
88bb4ea1 TA |
159 | if (s3c24xx_serial_has_interrupt_mask(port)) |
160 | __set_bit(S3C64XX_UINTM_TXD, | |
161 | portaddrl(port, S3C64XX_UINTM)); | |
162 | else | |
163 | disable_irq_nosync(ourport->tx_irq); | |
b497549a BD |
164 | tx_enabled(port) = 0; |
165 | if (port->flags & UPF_CONS_FLOW) | |
166 | s3c24xx_serial_rx_enable(port); | |
167 | } | |
168 | } | |
169 | ||
170 | static void s3c24xx_serial_start_tx(struct uart_port *port) | |
171 | { | |
b73c289c BD |
172 | struct s3c24xx_uart_port *ourport = to_ourport(port); |
173 | ||
b497549a BD |
174 | if (!tx_enabled(port)) { |
175 | if (port->flags & UPF_CONS_FLOW) | |
176 | s3c24xx_serial_rx_disable(port); | |
177 | ||
88bb4ea1 TA |
178 | if (s3c24xx_serial_has_interrupt_mask(port)) |
179 | __clear_bit(S3C64XX_UINTM_TXD, | |
180 | portaddrl(port, S3C64XX_UINTM)); | |
181 | else | |
182 | enable_irq(ourport->tx_irq); | |
b497549a BD |
183 | tx_enabled(port) = 1; |
184 | } | |
185 | } | |
186 | ||
b497549a BD |
187 | static void s3c24xx_serial_stop_rx(struct uart_port *port) |
188 | { | |
b73c289c BD |
189 | struct s3c24xx_uart_port *ourport = to_ourport(port); |
190 | ||
b497549a BD |
191 | if (rx_enabled(port)) { |
192 | dbg("s3c24xx_serial_stop_rx: port=%p\n", port); | |
88bb4ea1 TA |
193 | if (s3c24xx_serial_has_interrupt_mask(port)) |
194 | __set_bit(S3C64XX_UINTM_RXD, | |
195 | portaddrl(port, S3C64XX_UINTM)); | |
196 | else | |
197 | disable_irq_nosync(ourport->rx_irq); | |
b497549a BD |
198 | rx_enabled(port) = 0; |
199 | } | |
200 | } | |
201 | ||
b497549a BD |
202 | static inline struct s3c24xx_uart_info *s3c24xx_port_to_info(struct uart_port *port) |
203 | { | |
204 | return to_ourport(port)->info; | |
205 | } | |
206 | ||
207 | static inline struct s3c2410_uartcfg *s3c24xx_port_to_cfg(struct uart_port *port) | |
208 | { | |
4d84e970 TA |
209 | struct s3c24xx_uart_port *ourport; |
210 | ||
b497549a BD |
211 | if (port->dev == NULL) |
212 | return NULL; | |
213 | ||
4d84e970 TA |
214 | ourport = container_of(port, struct s3c24xx_uart_port, port); |
215 | return ourport->cfg; | |
b497549a BD |
216 | } |
217 | ||
218 | static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport, | |
219 | unsigned long ufstat) | |
220 | { | |
221 | struct s3c24xx_uart_info *info = ourport->info; | |
222 | ||
223 | if (ufstat & info->rx_fifofull) | |
da121506 | 224 | return ourport->port.fifosize; |
b497549a BD |
225 | |
226 | return (ufstat & info->rx_fifomask) >> info->rx_fifoshift; | |
227 | } | |
228 | ||
229 | ||
230 | /* ? - where has parity gone?? */ | |
231 | #define S3C2410_UERSTAT_PARITY (0x1000) | |
232 | ||
233 | static irqreturn_t | |
234 | s3c24xx_serial_rx_chars(int irq, void *dev_id) | |
235 | { | |
236 | struct s3c24xx_uart_port *ourport = dev_id; | |
237 | struct uart_port *port = &ourport->port; | |
b497549a | 238 | unsigned int ufcon, ch, flag, ufstat, uerstat; |
c15c3747 | 239 | unsigned long flags; |
b497549a BD |
240 | int max_count = 64; |
241 | ||
c15c3747 TA |
242 | spin_lock_irqsave(&port->lock, flags); |
243 | ||
b497549a BD |
244 | while (max_count-- > 0) { |
245 | ufcon = rd_regl(port, S3C2410_UFCON); | |
246 | ufstat = rd_regl(port, S3C2410_UFSTAT); | |
247 | ||
248 | if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0) | |
249 | break; | |
250 | ||
251 | uerstat = rd_regl(port, S3C2410_UERSTAT); | |
252 | ch = rd_regb(port, S3C2410_URXH); | |
253 | ||
254 | if (port->flags & UPF_CONS_FLOW) { | |
255 | int txe = s3c24xx_serial_txempty_nofifo(port); | |
256 | ||
257 | if (rx_enabled(port)) { | |
258 | if (!txe) { | |
259 | rx_enabled(port) = 0; | |
260 | continue; | |
261 | } | |
262 | } else { | |
263 | if (txe) { | |
264 | ufcon |= S3C2410_UFCON_RESETRX; | |
265 | wr_regl(port, S3C2410_UFCON, ufcon); | |
266 | rx_enabled(port) = 1; | |
f5693ea2 VK |
267 | spin_unlock_irqrestore(&port->lock, |
268 | flags); | |
b497549a BD |
269 | goto out; |
270 | } | |
271 | continue; | |
272 | } | |
273 | } | |
274 | ||
275 | /* insert the character into the buffer */ | |
276 | ||
277 | flag = TTY_NORMAL; | |
278 | port->icount.rx++; | |
279 | ||
280 | if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) { | |
281 | dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n", | |
282 | ch, uerstat); | |
283 | ||
284 | /* check for break */ | |
285 | if (uerstat & S3C2410_UERSTAT_BREAK) { | |
286 | dbg("break!\n"); | |
287 | port->icount.brk++; | |
288 | if (uart_handle_break(port)) | |
9303ac15 | 289 | goto ignore_char; |
b497549a BD |
290 | } |
291 | ||
292 | if (uerstat & S3C2410_UERSTAT_FRAME) | |
293 | port->icount.frame++; | |
294 | if (uerstat & S3C2410_UERSTAT_OVERRUN) | |
295 | port->icount.overrun++; | |
296 | ||
297 | uerstat &= port->read_status_mask; | |
298 | ||
299 | if (uerstat & S3C2410_UERSTAT_BREAK) | |
300 | flag = TTY_BREAK; | |
301 | else if (uerstat & S3C2410_UERSTAT_PARITY) | |
302 | flag = TTY_PARITY; | |
303 | else if (uerstat & (S3C2410_UERSTAT_FRAME | | |
304 | S3C2410_UERSTAT_OVERRUN)) | |
305 | flag = TTY_FRAME; | |
306 | } | |
307 | ||
308 | if (uart_handle_sysrq_char(port, ch)) | |
309 | goto ignore_char; | |
310 | ||
311 | uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN, | |
312 | ch, flag); | |
313 | ||
314 | ignore_char: | |
315 | continue; | |
316 | } | |
f5693ea2 VK |
317 | |
318 | spin_unlock_irqrestore(&port->lock, flags); | |
2e124b4a | 319 | tty_flip_buffer_push(&port->state->port); |
b497549a BD |
320 | |
321 | out: | |
322 | return IRQ_HANDLED; | |
323 | } | |
324 | ||
325 | static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id) | |
326 | { | |
327 | struct s3c24xx_uart_port *ourport = id; | |
328 | struct uart_port *port = &ourport->port; | |
ebd2c8f6 | 329 | struct circ_buf *xmit = &port->state->xmit; |
c15c3747 | 330 | unsigned long flags; |
b497549a BD |
331 | int count = 256; |
332 | ||
c15c3747 TA |
333 | spin_lock_irqsave(&port->lock, flags); |
334 | ||
b497549a BD |
335 | if (port->x_char) { |
336 | wr_regb(port, S3C2410_UTXH, port->x_char); | |
337 | port->icount.tx++; | |
338 | port->x_char = 0; | |
339 | goto out; | |
340 | } | |
341 | ||
25985edc | 342 | /* if there isn't anything more to transmit, or the uart is now |
b497549a BD |
343 | * stopped, disable the uart and exit |
344 | */ | |
345 | ||
346 | if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { | |
347 | s3c24xx_serial_stop_tx(port); | |
348 | goto out; | |
349 | } | |
350 | ||
351 | /* try and drain the buffer... */ | |
352 | ||
353 | while (!uart_circ_empty(xmit) && count-- > 0) { | |
354 | if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull) | |
355 | break; | |
356 | ||
357 | wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]); | |
358 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
359 | port->icount.tx++; | |
360 | } | |
361 | ||
c15c3747 TA |
362 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) { |
363 | spin_unlock(&port->lock); | |
b497549a | 364 | uart_write_wakeup(port); |
c15c3747 TA |
365 | spin_lock(&port->lock); |
366 | } | |
b497549a BD |
367 | |
368 | if (uart_circ_empty(xmit)) | |
369 | s3c24xx_serial_stop_tx(port); | |
370 | ||
371 | out: | |
c15c3747 | 372 | spin_unlock_irqrestore(&port->lock, flags); |
b497549a BD |
373 | return IRQ_HANDLED; |
374 | } | |
375 | ||
88bb4ea1 TA |
376 | /* interrupt handler for s3c64xx and later SoC's.*/ |
377 | static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id) | |
378 | { | |
379 | struct s3c24xx_uart_port *ourport = id; | |
380 | struct uart_port *port = &ourport->port; | |
381 | unsigned int pend = rd_regl(port, S3C64XX_UINTP); | |
88bb4ea1 TA |
382 | irqreturn_t ret = IRQ_HANDLED; |
383 | ||
88bb4ea1 TA |
384 | if (pend & S3C64XX_UINTM_RXD_MSK) { |
385 | ret = s3c24xx_serial_rx_chars(irq, id); | |
386 | wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_RXD_MSK); | |
387 | } | |
388 | if (pend & S3C64XX_UINTM_TXD_MSK) { | |
389 | ret = s3c24xx_serial_tx_chars(irq, id); | |
390 | wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_TXD_MSK); | |
391 | } | |
88bb4ea1 TA |
392 | return ret; |
393 | } | |
394 | ||
b497549a BD |
395 | static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port) |
396 | { | |
397 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
398 | unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT); | |
399 | unsigned long ufcon = rd_regl(port, S3C2410_UFCON); | |
400 | ||
401 | if (ufcon & S3C2410_UFCON_FIFOMODE) { | |
402 | if ((ufstat & info->tx_fifomask) != 0 || | |
403 | (ufstat & info->tx_fifofull)) | |
404 | return 0; | |
405 | ||
406 | return 1; | |
407 | } | |
408 | ||
409 | return s3c24xx_serial_txempty_nofifo(port); | |
410 | } | |
411 | ||
412 | /* no modem control lines */ | |
413 | static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port) | |
414 | { | |
415 | unsigned int umstat = rd_regb(port, S3C2410_UMSTAT); | |
416 | ||
417 | if (umstat & S3C2410_UMSTAT_CTS) | |
418 | return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; | |
419 | else | |
420 | return TIOCM_CAR | TIOCM_DSR; | |
421 | } | |
422 | ||
423 | static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
424 | { | |
2d1e5a48 JMG |
425 | unsigned int umcon = rd_regl(port, S3C2410_UMCON); |
426 | ||
427 | if (mctrl & TIOCM_RTS) | |
428 | umcon |= S3C2410_UMCOM_RTS_LOW; | |
429 | else | |
430 | umcon &= ~S3C2410_UMCOM_RTS_LOW; | |
431 | ||
432 | wr_regl(port, S3C2410_UMCON, umcon); | |
b497549a BD |
433 | } |
434 | ||
435 | static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state) | |
436 | { | |
437 | unsigned long flags; | |
438 | unsigned int ucon; | |
439 | ||
440 | spin_lock_irqsave(&port->lock, flags); | |
441 | ||
442 | ucon = rd_regl(port, S3C2410_UCON); | |
443 | ||
444 | if (break_state) | |
445 | ucon |= S3C2410_UCON_SBREAK; | |
446 | else | |
447 | ucon &= ~S3C2410_UCON_SBREAK; | |
448 | ||
449 | wr_regl(port, S3C2410_UCON, ucon); | |
450 | ||
451 | spin_unlock_irqrestore(&port->lock, flags); | |
452 | } | |
453 | ||
454 | static void s3c24xx_serial_shutdown(struct uart_port *port) | |
455 | { | |
456 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
457 | ||
458 | if (ourport->tx_claimed) { | |
88bb4ea1 TA |
459 | if (!s3c24xx_serial_has_interrupt_mask(port)) |
460 | free_irq(ourport->tx_irq, ourport); | |
b497549a BD |
461 | tx_enabled(port) = 0; |
462 | ourport->tx_claimed = 0; | |
463 | } | |
464 | ||
465 | if (ourport->rx_claimed) { | |
88bb4ea1 TA |
466 | if (!s3c24xx_serial_has_interrupt_mask(port)) |
467 | free_irq(ourport->rx_irq, ourport); | |
b497549a BD |
468 | ourport->rx_claimed = 0; |
469 | rx_enabled(port) = 0; | |
470 | } | |
b497549a | 471 | |
88bb4ea1 TA |
472 | /* Clear pending interrupts and mask all interrupts */ |
473 | if (s3c24xx_serial_has_interrupt_mask(port)) { | |
b6ad2935 TF |
474 | free_irq(port->irq, ourport); |
475 | ||
88bb4ea1 TA |
476 | wr_regl(port, S3C64XX_UINTP, 0xf); |
477 | wr_regl(port, S3C64XX_UINTM, 0xf); | |
478 | } | |
479 | } | |
b497549a BD |
480 | |
481 | static int s3c24xx_serial_startup(struct uart_port *port) | |
482 | { | |
483 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
484 | int ret; | |
485 | ||
e4ac92df JP |
486 | dbg("s3c24xx_serial_startup: port=%p (%08llx,%p)\n", |
487 | port, (unsigned long long)port->mapbase, port->membase); | |
b497549a BD |
488 | |
489 | rx_enabled(port) = 1; | |
490 | ||
b73c289c | 491 | ret = request_irq(ourport->rx_irq, s3c24xx_serial_rx_chars, 0, |
b497549a BD |
492 | s3c24xx_serial_portname(port), ourport); |
493 | ||
494 | if (ret != 0) { | |
d20925e1 | 495 | dev_err(port->dev, "cannot get irq %d\n", ourport->rx_irq); |
b497549a BD |
496 | return ret; |
497 | } | |
498 | ||
499 | ourport->rx_claimed = 1; | |
500 | ||
501 | dbg("requesting tx irq...\n"); | |
502 | ||
503 | tx_enabled(port) = 1; | |
504 | ||
b73c289c | 505 | ret = request_irq(ourport->tx_irq, s3c24xx_serial_tx_chars, 0, |
b497549a BD |
506 | s3c24xx_serial_portname(port), ourport); |
507 | ||
508 | if (ret) { | |
d20925e1 | 509 | dev_err(port->dev, "cannot get irq %d\n", ourport->tx_irq); |
b497549a BD |
510 | goto err; |
511 | } | |
512 | ||
513 | ourport->tx_claimed = 1; | |
514 | ||
515 | dbg("s3c24xx_serial_startup ok\n"); | |
516 | ||
517 | /* the port reset code should have done the correct | |
518 | * register setup for the port controls */ | |
519 | ||
520 | return ret; | |
521 | ||
522 | err: | |
523 | s3c24xx_serial_shutdown(port); | |
524 | return ret; | |
525 | } | |
526 | ||
88bb4ea1 TA |
527 | static int s3c64xx_serial_startup(struct uart_port *port) |
528 | { | |
529 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
530 | int ret; | |
531 | ||
e4ac92df JP |
532 | dbg("s3c64xx_serial_startup: port=%p (%08llx,%p)\n", |
533 | port, (unsigned long long)port->mapbase, port->membase); | |
88bb4ea1 | 534 | |
b6ad2935 TF |
535 | wr_regl(port, S3C64XX_UINTM, 0xf); |
536 | ||
88bb4ea1 TA |
537 | ret = request_irq(port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED, |
538 | s3c24xx_serial_portname(port), ourport); | |
539 | if (ret) { | |
d20925e1 | 540 | dev_err(port->dev, "cannot get irq %d\n", port->irq); |
88bb4ea1 TA |
541 | return ret; |
542 | } | |
543 | ||
544 | /* For compatibility with s3c24xx Soc's */ | |
545 | rx_enabled(port) = 1; | |
546 | ourport->rx_claimed = 1; | |
547 | tx_enabled(port) = 0; | |
548 | ourport->tx_claimed = 1; | |
549 | ||
550 | /* Enable Rx Interrupt */ | |
551 | __clear_bit(S3C64XX_UINTM_RXD, portaddrl(port, S3C64XX_UINTM)); | |
552 | dbg("s3c64xx_serial_startup ok\n"); | |
553 | return ret; | |
554 | } | |
555 | ||
b497549a BD |
556 | /* power power management control */ |
557 | ||
558 | static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level, | |
559 | unsigned int old) | |
560 | { | |
561 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
1ff383a4 | 562 | int timeout = 10000; |
b497549a | 563 | |
30555476 BD |
564 | ourport->pm_level = level; |
565 | ||
b497549a BD |
566 | switch (level) { |
567 | case 3: | |
1ff383a4 RB |
568 | while (--timeout && !s3c24xx_serial_txempty_nofifo(port)) |
569 | udelay(100); | |
570 | ||
7cd88831 | 571 | if (!IS_ERR(ourport->baudclk)) |
9484b009 | 572 | clk_disable_unprepare(ourport->baudclk); |
b497549a | 573 | |
9484b009 | 574 | clk_disable_unprepare(ourport->clk); |
b497549a BD |
575 | break; |
576 | ||
577 | case 0: | |
9484b009 | 578 | clk_prepare_enable(ourport->clk); |
b497549a | 579 | |
7cd88831 | 580 | if (!IS_ERR(ourport->baudclk)) |
9484b009 | 581 | clk_prepare_enable(ourport->baudclk); |
b497549a BD |
582 | |
583 | break; | |
584 | default: | |
d20925e1 | 585 | dev_err(port->dev, "s3c24xx_serial: unknown pm %d\n", level); |
b497549a BD |
586 | } |
587 | } | |
588 | ||
589 | /* baud rate calculation | |
590 | * | |
591 | * The UARTs on the S3C2410/S3C2440 can take their clocks from a number | |
592 | * of different sources, including the peripheral clock ("pclk") and an | |
593 | * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk") | |
594 | * with a programmable extra divisor. | |
595 | * | |
596 | * The following code goes through the clock sources, and calculates the | |
597 | * baud clocks (and the resultant actual baud rates) and then tries to | |
598 | * pick the closest one and select that. | |
599 | * | |
600 | */ | |
601 | ||
5f5a7a55 | 602 | #define MAX_CLK_NAME_LENGTH 15 |
b497549a | 603 | |
5f5a7a55 | 604 | static inline int s3c24xx_serial_getsource(struct uart_port *port) |
b497549a BD |
605 | { |
606 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
5f5a7a55 | 607 | unsigned int ucon; |
b497549a | 608 | |
5f5a7a55 TA |
609 | if (info->num_clks == 1) |
610 | return 0; | |
b497549a | 611 | |
5f5a7a55 TA |
612 | ucon = rd_regl(port, S3C2410_UCON); |
613 | ucon &= info->clksel_mask; | |
614 | return ucon >> info->clksel_shift; | |
b497549a BD |
615 | } |
616 | ||
5f5a7a55 TA |
617 | static void s3c24xx_serial_setsource(struct uart_port *port, |
618 | unsigned int clk_sel) | |
b497549a | 619 | { |
5f5a7a55 TA |
620 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); |
621 | unsigned int ucon; | |
b497549a | 622 | |
5f5a7a55 TA |
623 | if (info->num_clks == 1) |
624 | return; | |
090f848d | 625 | |
5f5a7a55 TA |
626 | ucon = rd_regl(port, S3C2410_UCON); |
627 | if ((ucon & info->clksel_mask) >> info->clksel_shift == clk_sel) | |
628 | return; | |
b497549a | 629 | |
5f5a7a55 TA |
630 | ucon &= ~info->clksel_mask; |
631 | ucon |= clk_sel << info->clksel_shift; | |
632 | wr_regl(port, S3C2410_UCON, ucon); | |
b497549a BD |
633 | } |
634 | ||
5f5a7a55 TA |
635 | static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport, |
636 | unsigned int req_baud, struct clk **best_clk, | |
637 | unsigned int *clk_num) | |
b497549a | 638 | { |
5f5a7a55 TA |
639 | struct s3c24xx_uart_info *info = ourport->info; |
640 | struct clk *clk; | |
641 | unsigned long rate; | |
642 | unsigned int cnt, baud, quot, clk_sel, best_quot = 0; | |
643 | char clkname[MAX_CLK_NAME_LENGTH]; | |
644 | int calc_deviation, deviation = (1 << 30) - 1; | |
645 | ||
5f5a7a55 TA |
646 | clk_sel = (ourport->cfg->clk_sel) ? ourport->cfg->clk_sel : |
647 | ourport->info->def_clk_sel; | |
648 | for (cnt = 0; cnt < info->num_clks; cnt++) { | |
649 | if (!(clk_sel & (1 << cnt))) | |
650 | continue; | |
651 | ||
652 | sprintf(clkname, "clk_uart_baud%d", cnt); | |
653 | clk = clk_get(ourport->port.dev, clkname); | |
7cd88831 | 654 | if (IS_ERR(clk)) |
5f5a7a55 TA |
655 | continue; |
656 | ||
657 | rate = clk_get_rate(clk); | |
658 | if (!rate) | |
659 | continue; | |
660 | ||
661 | if (ourport->info->has_divslot) { | |
662 | unsigned long div = rate / req_baud; | |
663 | ||
664 | /* The UDIVSLOT register on the newer UARTs allows us to | |
665 | * get a divisor adjustment of 1/16th on the baud clock. | |
666 | * | |
667 | * We don't keep the UDIVSLOT value (the 16ths we | |
668 | * calculated by not multiplying the baud by 16) as it | |
669 | * is easy enough to recalculate. | |
670 | */ | |
671 | ||
672 | quot = div / 16; | |
673 | baud = rate / div; | |
674 | } else { | |
675 | quot = (rate + (8 * req_baud)) / (16 * req_baud); | |
676 | baud = rate / (quot * 16); | |
b497549a | 677 | } |
5f5a7a55 | 678 | quot--; |
b497549a | 679 | |
5f5a7a55 TA |
680 | calc_deviation = req_baud - baud; |
681 | if (calc_deviation < 0) | |
682 | calc_deviation = -calc_deviation; | |
b497549a | 683 | |
5f5a7a55 TA |
684 | if (calc_deviation < deviation) { |
685 | *best_clk = clk; | |
686 | best_quot = quot; | |
687 | *clk_num = cnt; | |
688 | deviation = calc_deviation; | |
b497549a BD |
689 | } |
690 | } | |
691 | ||
5f5a7a55 | 692 | return best_quot; |
b497549a BD |
693 | } |
694 | ||
090f848d BD |
695 | /* udivslot_table[] |
696 | * | |
697 | * This table takes the fractional value of the baud divisor and gives | |
698 | * the recommended setting for the UDIVSLOT register. | |
699 | */ | |
700 | static u16 udivslot_table[16] = { | |
701 | [0] = 0x0000, | |
702 | [1] = 0x0080, | |
703 | [2] = 0x0808, | |
704 | [3] = 0x0888, | |
705 | [4] = 0x2222, | |
706 | [5] = 0x4924, | |
707 | [6] = 0x4A52, | |
708 | [7] = 0x54AA, | |
709 | [8] = 0x5555, | |
710 | [9] = 0xD555, | |
711 | [10] = 0xD5D5, | |
712 | [11] = 0xDDD5, | |
713 | [12] = 0xDDDD, | |
714 | [13] = 0xDFDD, | |
715 | [14] = 0xDFDF, | |
716 | [15] = 0xFFDF, | |
717 | }; | |
718 | ||
b497549a BD |
719 | static void s3c24xx_serial_set_termios(struct uart_port *port, |
720 | struct ktermios *termios, | |
721 | struct ktermios *old) | |
722 | { | |
723 | struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port); | |
724 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
7cd88831 | 725 | struct clk *clk = ERR_PTR(-EINVAL); |
b497549a | 726 | unsigned long flags; |
5f5a7a55 | 727 | unsigned int baud, quot, clk_sel = 0; |
b497549a BD |
728 | unsigned int ulcon; |
729 | unsigned int umcon; | |
090f848d | 730 | unsigned int udivslot = 0; |
b497549a BD |
731 | |
732 | /* | |
733 | * We don't support modem control lines. | |
734 | */ | |
735 | termios->c_cflag &= ~(HUPCL | CMSPAR); | |
736 | termios->c_cflag |= CLOCAL; | |
737 | ||
738 | /* | |
739 | * Ask the core to calculate the divisor for us. | |
740 | */ | |
741 | ||
742 | baud = uart_get_baud_rate(port, termios, old, 0, 115200*8); | |
5f5a7a55 | 743 | quot = s3c24xx_serial_getclk(ourport, baud, &clk, &clk_sel); |
b497549a BD |
744 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) |
745 | quot = port->custom_divisor; | |
7cd88831 | 746 | if (IS_ERR(clk)) |
5f5a7a55 | 747 | return; |
b497549a BD |
748 | |
749 | /* check to see if we need to change clock source */ | |
750 | ||
5f5a7a55 TA |
751 | if (ourport->baudclk != clk) { |
752 | s3c24xx_serial_setsource(port, clk_sel); | |
b497549a | 753 | |
7cd88831 | 754 | if (!IS_ERR(ourport->baudclk)) { |
9484b009 | 755 | clk_disable_unprepare(ourport->baudclk); |
7cd88831 | 756 | ourport->baudclk = ERR_PTR(-EINVAL); |
b497549a BD |
757 | } |
758 | ||
9484b009 | 759 | clk_prepare_enable(clk); |
b497549a | 760 | |
b497549a | 761 | ourport->baudclk = clk; |
30555476 | 762 | ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0; |
b497549a BD |
763 | } |
764 | ||
090f848d BD |
765 | if (ourport->info->has_divslot) { |
766 | unsigned int div = ourport->baudclk_rate / baud; | |
767 | ||
8b526ae4 JL |
768 | if (cfg->has_fracval) { |
769 | udivslot = (div & 15); | |
770 | dbg("fracval = %04x\n", udivslot); | |
771 | } else { | |
772 | udivslot = udivslot_table[div & 15]; | |
773 | dbg("udivslot = %04x (div %d)\n", udivslot, div & 15); | |
774 | } | |
090f848d BD |
775 | } |
776 | ||
b497549a BD |
777 | switch (termios->c_cflag & CSIZE) { |
778 | case CS5: | |
779 | dbg("config: 5bits/char\n"); | |
780 | ulcon = S3C2410_LCON_CS5; | |
781 | break; | |
782 | case CS6: | |
783 | dbg("config: 6bits/char\n"); | |
784 | ulcon = S3C2410_LCON_CS6; | |
785 | break; | |
786 | case CS7: | |
787 | dbg("config: 7bits/char\n"); | |
788 | ulcon = S3C2410_LCON_CS7; | |
789 | break; | |
790 | case CS8: | |
791 | default: | |
792 | dbg("config: 8bits/char\n"); | |
793 | ulcon = S3C2410_LCON_CS8; | |
794 | break; | |
795 | } | |
796 | ||
797 | /* preserve original lcon IR settings */ | |
798 | ulcon |= (cfg->ulcon & S3C2410_LCON_IRM); | |
799 | ||
800 | if (termios->c_cflag & CSTOPB) | |
801 | ulcon |= S3C2410_LCON_STOPB; | |
802 | ||
b497549a BD |
803 | if (termios->c_cflag & PARENB) { |
804 | if (termios->c_cflag & PARODD) | |
805 | ulcon |= S3C2410_LCON_PODD; | |
806 | else | |
807 | ulcon |= S3C2410_LCON_PEVEN; | |
808 | } else { | |
809 | ulcon |= S3C2410_LCON_PNONE; | |
810 | } | |
811 | ||
812 | spin_lock_irqsave(&port->lock, flags); | |
813 | ||
090f848d BD |
814 | dbg("setting ulcon to %08x, brddiv to %d, udivslot %08x\n", |
815 | ulcon, quot, udivslot); | |
b497549a BD |
816 | |
817 | wr_regl(port, S3C2410_ULCON, ulcon); | |
818 | wr_regl(port, S3C2410_UBRDIV, quot); | |
2d1e5a48 JMG |
819 | |
820 | umcon = rd_regl(port, S3C2410_UMCON); | |
821 | if (termios->c_cflag & CRTSCTS) { | |
822 | umcon |= S3C2410_UMCOM_AFC; | |
823 | /* Disable RTS when RX FIFO contains 63 bytes */ | |
824 | umcon &= ~S3C2412_UMCON_AFC_8; | |
825 | } else { | |
826 | umcon &= ~S3C2410_UMCOM_AFC; | |
827 | } | |
b497549a BD |
828 | wr_regl(port, S3C2410_UMCON, umcon); |
829 | ||
090f848d BD |
830 | if (ourport->info->has_divslot) |
831 | wr_regl(port, S3C2443_DIVSLOT, udivslot); | |
832 | ||
b497549a BD |
833 | dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n", |
834 | rd_regl(port, S3C2410_ULCON), | |
835 | rd_regl(port, S3C2410_UCON), | |
836 | rd_regl(port, S3C2410_UFCON)); | |
837 | ||
838 | /* | |
839 | * Update the per-port timeout. | |
840 | */ | |
841 | uart_update_timeout(port, termios->c_cflag, baud); | |
842 | ||
843 | /* | |
844 | * Which character status flags are we interested in? | |
845 | */ | |
846 | port->read_status_mask = S3C2410_UERSTAT_OVERRUN; | |
847 | if (termios->c_iflag & INPCK) | |
848 | port->read_status_mask |= S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_PARITY; | |
849 | ||
850 | /* | |
851 | * Which character status flags should we ignore? | |
852 | */ | |
853 | port->ignore_status_mask = 0; | |
854 | if (termios->c_iflag & IGNPAR) | |
855 | port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN; | |
856 | if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR) | |
857 | port->ignore_status_mask |= S3C2410_UERSTAT_FRAME; | |
858 | ||
859 | /* | |
860 | * Ignore all characters if CREAD is not set. | |
861 | */ | |
862 | if ((termios->c_cflag & CREAD) == 0) | |
863 | port->ignore_status_mask |= RXSTAT_DUMMY_READ; | |
864 | ||
865 | spin_unlock_irqrestore(&port->lock, flags); | |
866 | } | |
867 | ||
868 | static const char *s3c24xx_serial_type(struct uart_port *port) | |
869 | { | |
870 | switch (port->type) { | |
871 | case PORT_S3C2410: | |
872 | return "S3C2410"; | |
873 | case PORT_S3C2440: | |
874 | return "S3C2440"; | |
875 | case PORT_S3C2412: | |
876 | return "S3C2412"; | |
b690ace5 BD |
877 | case PORT_S3C6400: |
878 | return "S3C6400/10"; | |
b497549a BD |
879 | default: |
880 | return NULL; | |
881 | } | |
882 | } | |
883 | ||
884 | #define MAP_SIZE (0x100) | |
885 | ||
886 | static void s3c24xx_serial_release_port(struct uart_port *port) | |
887 | { | |
888 | release_mem_region(port->mapbase, MAP_SIZE); | |
889 | } | |
890 | ||
891 | static int s3c24xx_serial_request_port(struct uart_port *port) | |
892 | { | |
893 | const char *name = s3c24xx_serial_portname(port); | |
894 | return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY; | |
895 | } | |
896 | ||
897 | static void s3c24xx_serial_config_port(struct uart_port *port, int flags) | |
898 | { | |
899 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
900 | ||
901 | if (flags & UART_CONFIG_TYPE && | |
902 | s3c24xx_serial_request_port(port) == 0) | |
903 | port->type = info->type; | |
904 | } | |
905 | ||
906 | /* | |
907 | * verify the new serial_struct (for TIOCSSERIAL). | |
908 | */ | |
909 | static int | |
910 | s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser) | |
911 | { | |
912 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
913 | ||
914 | if (ser->type != PORT_UNKNOWN && ser->type != info->type) | |
915 | return -EINVAL; | |
916 | ||
917 | return 0; | |
918 | } | |
919 | ||
920 | ||
921 | #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE | |
922 | ||
923 | static struct console s3c24xx_serial_console; | |
924 | ||
93b5c032 JP |
925 | static int __init s3c24xx_serial_console_init(void) |
926 | { | |
927 | register_console(&s3c24xx_serial_console); | |
928 | return 0; | |
929 | } | |
930 | console_initcall(s3c24xx_serial_console_init); | |
931 | ||
b497549a BD |
932 | #define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console |
933 | #else | |
934 | #define S3C24XX_SERIAL_CONSOLE NULL | |
935 | #endif | |
936 | ||
84f57d9e | 937 | #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL) |
93b5c032 JP |
938 | static int s3c24xx_serial_get_poll_char(struct uart_port *port); |
939 | static void s3c24xx_serial_put_poll_char(struct uart_port *port, | |
940 | unsigned char c); | |
941 | #endif | |
942 | ||
b497549a BD |
943 | static struct uart_ops s3c24xx_serial_ops = { |
944 | .pm = s3c24xx_serial_pm, | |
945 | .tx_empty = s3c24xx_serial_tx_empty, | |
946 | .get_mctrl = s3c24xx_serial_get_mctrl, | |
947 | .set_mctrl = s3c24xx_serial_set_mctrl, | |
948 | .stop_tx = s3c24xx_serial_stop_tx, | |
949 | .start_tx = s3c24xx_serial_start_tx, | |
950 | .stop_rx = s3c24xx_serial_stop_rx, | |
b497549a BD |
951 | .break_ctl = s3c24xx_serial_break_ctl, |
952 | .startup = s3c24xx_serial_startup, | |
953 | .shutdown = s3c24xx_serial_shutdown, | |
954 | .set_termios = s3c24xx_serial_set_termios, | |
955 | .type = s3c24xx_serial_type, | |
956 | .release_port = s3c24xx_serial_release_port, | |
957 | .request_port = s3c24xx_serial_request_port, | |
958 | .config_port = s3c24xx_serial_config_port, | |
959 | .verify_port = s3c24xx_serial_verify_port, | |
84f57d9e | 960 | #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL) |
93b5c032 JP |
961 | .poll_get_char = s3c24xx_serial_get_poll_char, |
962 | .poll_put_char = s3c24xx_serial_put_poll_char, | |
963 | #endif | |
b497549a BD |
964 | }; |
965 | ||
b497549a BD |
966 | static struct uart_driver s3c24xx_uart_drv = { |
967 | .owner = THIS_MODULE, | |
2cf0c58e | 968 | .driver_name = "s3c2410_serial", |
bdd4915a | 969 | .nr = CONFIG_SERIAL_SAMSUNG_UARTS, |
b497549a | 970 | .cons = S3C24XX_SERIAL_CONSOLE, |
2cf0c58e | 971 | .dev_name = S3C24XX_SERIAL_NAME, |
b497549a BD |
972 | .major = S3C24XX_SERIAL_MAJOR, |
973 | .minor = S3C24XX_SERIAL_MINOR, | |
974 | }; | |
975 | ||
03d5e77b | 976 | static struct s3c24xx_uart_port s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = { |
b497549a BD |
977 | [0] = { |
978 | .port = { | |
979 | .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[0].port.lock), | |
980 | .iotype = UPIO_MEM, | |
b497549a BD |
981 | .uartclk = 0, |
982 | .fifosize = 16, | |
983 | .ops = &s3c24xx_serial_ops, | |
984 | .flags = UPF_BOOT_AUTOCONF, | |
985 | .line = 0, | |
986 | } | |
987 | }, | |
988 | [1] = { | |
989 | .port = { | |
990 | .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[1].port.lock), | |
991 | .iotype = UPIO_MEM, | |
b497549a BD |
992 | .uartclk = 0, |
993 | .fifosize = 16, | |
994 | .ops = &s3c24xx_serial_ops, | |
995 | .flags = UPF_BOOT_AUTOCONF, | |
996 | .line = 1, | |
997 | } | |
998 | }, | |
03d5e77b | 999 | #if CONFIG_SERIAL_SAMSUNG_UARTS > 2 |
b497549a BD |
1000 | |
1001 | [2] = { | |
1002 | .port = { | |
1003 | .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[2].port.lock), | |
1004 | .iotype = UPIO_MEM, | |
b497549a BD |
1005 | .uartclk = 0, |
1006 | .fifosize = 16, | |
1007 | .ops = &s3c24xx_serial_ops, | |
1008 | .flags = UPF_BOOT_AUTOCONF, | |
1009 | .line = 2, | |
1010 | } | |
03d5e77b BD |
1011 | }, |
1012 | #endif | |
1013 | #if CONFIG_SERIAL_SAMSUNG_UARTS > 3 | |
1014 | [3] = { | |
1015 | .port = { | |
1016 | .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[3].port.lock), | |
1017 | .iotype = UPIO_MEM, | |
03d5e77b BD |
1018 | .uartclk = 0, |
1019 | .fifosize = 16, | |
1020 | .ops = &s3c24xx_serial_ops, | |
1021 | .flags = UPF_BOOT_AUTOCONF, | |
1022 | .line = 3, | |
1023 | } | |
b497549a BD |
1024 | } |
1025 | #endif | |
1026 | }; | |
1027 | ||
1028 | /* s3c24xx_serial_resetport | |
1029 | * | |
0dfb3b41 | 1030 | * reset the fifos and other the settings. |
b497549a BD |
1031 | */ |
1032 | ||
0dfb3b41 TA |
1033 | static void s3c24xx_serial_resetport(struct uart_port *port, |
1034 | struct s3c2410_uartcfg *cfg) | |
b497549a BD |
1035 | { |
1036 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
0dfb3b41 TA |
1037 | unsigned long ucon = rd_regl(port, S3C2410_UCON); |
1038 | unsigned int ucon_mask; | |
b497549a | 1039 | |
0dfb3b41 TA |
1040 | ucon_mask = info->clksel_mask; |
1041 | if (info->type == PORT_S3C2440) | |
1042 | ucon_mask |= S3C2440_UCON0_DIVMASK; | |
1043 | ||
1044 | ucon &= ucon_mask; | |
1045 | wr_regl(port, S3C2410_UCON, ucon | cfg->ucon); | |
1046 | ||
1047 | /* reset both fifos */ | |
1048 | wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH); | |
1049 | wr_regl(port, S3C2410_UFCON, cfg->ufcon); | |
1050 | ||
1051 | /* some delay is required after fifo reset */ | |
1052 | udelay(1); | |
b497549a BD |
1053 | } |
1054 | ||
30555476 BD |
1055 | |
1056 | #ifdef CONFIG_CPU_FREQ | |
1057 | ||
1058 | static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb, | |
1059 | unsigned long val, void *data) | |
1060 | { | |
1061 | struct s3c24xx_uart_port *port; | |
1062 | struct uart_port *uport; | |
1063 | ||
1064 | port = container_of(nb, struct s3c24xx_uart_port, freq_transition); | |
1065 | uport = &port->port; | |
1066 | ||
1067 | /* check to see if port is enabled */ | |
1068 | ||
1069 | if (port->pm_level != 0) | |
1070 | return 0; | |
1071 | ||
1072 | /* try and work out if the baudrate is changing, we can detect | |
1073 | * a change in rate, but we do not have support for detecting | |
1074 | * a disturbance in the clock-rate over the change. | |
1075 | */ | |
1076 | ||
25f04ad4 | 1077 | if (IS_ERR(port->baudclk)) |
30555476 BD |
1078 | goto exit; |
1079 | ||
25f04ad4 | 1080 | if (port->baudclk_rate == clk_get_rate(port->baudclk)) |
30555476 BD |
1081 | goto exit; |
1082 | ||
1083 | if (val == CPUFREQ_PRECHANGE) { | |
1084 | /* we should really shut the port down whilst the | |
1085 | * frequency change is in progress. */ | |
1086 | ||
1087 | } else if (val == CPUFREQ_POSTCHANGE) { | |
1088 | struct ktermios *termios; | |
1089 | struct tty_struct *tty; | |
1090 | ||
ebd2c8f6 | 1091 | if (uport->state == NULL) |
30555476 | 1092 | goto exit; |
30555476 | 1093 | |
ebd2c8f6 | 1094 | tty = uport->state->port.tty; |
30555476 | 1095 | |
7de40c21 | 1096 | if (tty == NULL) |
30555476 | 1097 | goto exit; |
30555476 | 1098 | |
adc8d746 | 1099 | termios = &tty->termios; |
30555476 BD |
1100 | |
1101 | if (termios == NULL) { | |
d20925e1 | 1102 | dev_warn(uport->dev, "%s: no termios?\n", __func__); |
30555476 BD |
1103 | goto exit; |
1104 | } | |
1105 | ||
1106 | s3c24xx_serial_set_termios(uport, termios, NULL); | |
1107 | } | |
1108 | ||
1109 | exit: | |
1110 | return 0; | |
1111 | } | |
1112 | ||
1113 | static inline int s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port) | |
1114 | { | |
1115 | port->freq_transition.notifier_call = s3c24xx_serial_cpufreq_transition; | |
1116 | ||
1117 | return cpufreq_register_notifier(&port->freq_transition, | |
1118 | CPUFREQ_TRANSITION_NOTIFIER); | |
1119 | } | |
1120 | ||
1121 | static inline void s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port) | |
1122 | { | |
1123 | cpufreq_unregister_notifier(&port->freq_transition, | |
1124 | CPUFREQ_TRANSITION_NOTIFIER); | |
1125 | } | |
1126 | ||
1127 | #else | |
1128 | static inline int s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port) | |
1129 | { | |
1130 | return 0; | |
1131 | } | |
1132 | ||
1133 | static inline void s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port) | |
1134 | { | |
1135 | } | |
1136 | #endif | |
1137 | ||
b497549a BD |
1138 | /* s3c24xx_serial_init_port |
1139 | * | |
1140 | * initialise a single serial port from the platform device given | |
1141 | */ | |
1142 | ||
1143 | static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport, | |
b497549a BD |
1144 | struct platform_device *platdev) |
1145 | { | |
1146 | struct uart_port *port = &ourport->port; | |
da121506 | 1147 | struct s3c2410_uartcfg *cfg = ourport->cfg; |
b497549a BD |
1148 | struct resource *res; |
1149 | int ret; | |
1150 | ||
1151 | dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev); | |
1152 | ||
1153 | if (platdev == NULL) | |
1154 | return -ENODEV; | |
1155 | ||
b497549a BD |
1156 | if (port->mapbase != 0) |
1157 | return 0; | |
1158 | ||
b497549a BD |
1159 | /* setup info for port */ |
1160 | port->dev = &platdev->dev; | |
b497549a | 1161 | |
88bb4ea1 TA |
1162 | /* Startup sequence is different for s3c64xx and higher SoC's */ |
1163 | if (s3c24xx_serial_has_interrupt_mask(port)) | |
1164 | s3c24xx_serial_ops.startup = s3c64xx_serial_startup; | |
1165 | ||
b497549a BD |
1166 | port->uartclk = 1; |
1167 | ||
1168 | if (cfg->uart_flags & UPF_CONS_FLOW) { | |
1169 | dbg("s3c24xx_serial_init_port: enabling flow control\n"); | |
1170 | port->flags |= UPF_CONS_FLOW; | |
1171 | } | |
1172 | ||
1173 | /* sort our the physical and virtual addresses for each UART */ | |
1174 | ||
1175 | res = platform_get_resource(platdev, IORESOURCE_MEM, 0); | |
1176 | if (res == NULL) { | |
d20925e1 | 1177 | dev_err(port->dev, "failed to find memory resource for uart\n"); |
b497549a BD |
1178 | return -EINVAL; |
1179 | } | |
1180 | ||
e4ac92df | 1181 | dbg("resource %pR)\n", res); |
b497549a | 1182 | |
41147bfd TA |
1183 | port->membase = devm_ioremap(port->dev, res->start, resource_size(res)); |
1184 | if (!port->membase) { | |
1185 | dev_err(port->dev, "failed to remap controller address\n"); | |
1186 | return -EBUSY; | |
1187 | } | |
1188 | ||
b690ace5 | 1189 | port->mapbase = res->start; |
b497549a BD |
1190 | ret = platform_get_irq(platdev, 0); |
1191 | if (ret < 0) | |
1192 | port->irq = 0; | |
b73c289c | 1193 | else { |
b497549a | 1194 | port->irq = ret; |
b73c289c BD |
1195 | ourport->rx_irq = ret; |
1196 | ourport->tx_irq = ret + 1; | |
1197 | } | |
9303ac15 | 1198 | |
b73c289c BD |
1199 | ret = platform_get_irq(platdev, 1); |
1200 | if (ret > 0) | |
1201 | ourport->tx_irq = ret; | |
b497549a BD |
1202 | |
1203 | ourport->clk = clk_get(&platdev->dev, "uart"); | |
60e93575 CK |
1204 | if (IS_ERR(ourport->clk)) { |
1205 | pr_err("%s: Controller clock not found\n", | |
1206 | dev_name(&platdev->dev)); | |
1207 | return PTR_ERR(ourport->clk); | |
1208 | } | |
1209 | ||
1210 | ret = clk_prepare_enable(ourport->clk); | |
1211 | if (ret) { | |
1212 | pr_err("uart: clock failed to prepare+enable: %d\n", ret); | |
1213 | clk_put(ourport->clk); | |
1214 | return ret; | |
1215 | } | |
b497549a | 1216 | |
88bb4ea1 TA |
1217 | /* Keep all interrupts masked and cleared */ |
1218 | if (s3c24xx_serial_has_interrupt_mask(port)) { | |
1219 | wr_regl(port, S3C64XX_UINTM, 0xf); | |
1220 | wr_regl(port, S3C64XX_UINTP, 0xf); | |
1221 | wr_regl(port, S3C64XX_UINTSP, 0xf); | |
1222 | } | |
1223 | ||
1ff5b64d FE |
1224 | dbg("port: map=%pa, mem=%p, irq=%d (%d,%d), clock=%u\n", |
1225 | &port->mapbase, port->membase, port->irq, | |
b73c289c | 1226 | ourport->rx_irq, ourport->tx_irq, port->uartclk); |
b497549a BD |
1227 | |
1228 | /* reset the fifos (and setup the uart) */ | |
1229 | s3c24xx_serial_resetport(port, cfg); | |
1230 | return 0; | |
1231 | } | |
1232 | ||
b497549a BD |
1233 | /* Device driver serial port probe */ |
1234 | ||
26c919e1 | 1235 | static const struct of_device_id s3c24xx_uart_dt_match[]; |
b497549a BD |
1236 | static int probe_index; |
1237 | ||
26c919e1 TA |
1238 | static inline struct s3c24xx_serial_drv_data *s3c24xx_get_driver_data( |
1239 | struct platform_device *pdev) | |
1240 | { | |
1241 | #ifdef CONFIG_OF | |
1242 | if (pdev->dev.of_node) { | |
1243 | const struct of_device_id *match; | |
1244 | match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node); | |
1245 | return (struct s3c24xx_serial_drv_data *)match->data; | |
1246 | } | |
1247 | #endif | |
1248 | return (struct s3c24xx_serial_drv_data *) | |
1249 | platform_get_device_id(pdev)->driver_data; | |
1250 | } | |
1251 | ||
da121506 | 1252 | static int s3c24xx_serial_probe(struct platform_device *pdev) |
b497549a | 1253 | { |
4622eb68 | 1254 | struct device_node *np = pdev->dev.of_node; |
b497549a | 1255 | struct s3c24xx_uart_port *ourport; |
13a9f6c6 | 1256 | int index = probe_index; |
b497549a BD |
1257 | int ret; |
1258 | ||
4622eb68 NKC |
1259 | if (np) { |
1260 | ret = of_alias_get_id(np, "serial"); | |
13a9f6c6 TF |
1261 | if (ret >= 0) |
1262 | index = ret; | |
1263 | } | |
1264 | ||
1265 | dbg("s3c24xx_serial_probe(%p) %d\n", pdev, index); | |
b497549a | 1266 | |
13a9f6c6 | 1267 | ourport = &s3c24xx_serial_ports[index]; |
da121506 | 1268 | |
26c919e1 TA |
1269 | ourport->drv_data = s3c24xx_get_driver_data(pdev); |
1270 | if (!ourport->drv_data) { | |
1271 | dev_err(&pdev->dev, "could not find driver data\n"); | |
1272 | return -ENODEV; | |
1273 | } | |
da121506 | 1274 | |
7cd88831 | 1275 | ourport->baudclk = ERR_PTR(-EINVAL); |
da121506 | 1276 | ourport->info = ourport->drv_data->info; |
574de559 | 1277 | ourport->cfg = (dev_get_platdata(&pdev->dev)) ? |
d4aab206 | 1278 | dev_get_platdata(&pdev->dev) : |
da121506 TA |
1279 | ourport->drv_data->def_cfg; |
1280 | ||
4622eb68 NKC |
1281 | if (np) |
1282 | of_property_read_u32(np, | |
135f07c3 NKC |
1283 | "samsung,uart-fifosize", &ourport->port.fifosize); |
1284 | ||
1285 | if (!ourport->port.fifosize) { | |
1286 | ourport->port.fifosize = (ourport->info->fifosize) ? | |
1287 | ourport->info->fifosize : | |
1288 | ourport->drv_data->fifosize[index]; | |
1289 | } | |
da121506 | 1290 | |
b497549a BD |
1291 | probe_index++; |
1292 | ||
1293 | dbg("%s: initialising port %p...\n", __func__, ourport); | |
1294 | ||
da121506 | 1295 | ret = s3c24xx_serial_init_port(ourport, pdev); |
b497549a | 1296 | if (ret < 0) |
8ad711a9 | 1297 | return ret; |
b497549a | 1298 | |
6f134c3c TB |
1299 | if (!s3c24xx_uart_drv.state) { |
1300 | ret = uart_register_driver(&s3c24xx_uart_drv); | |
1301 | if (ret < 0) { | |
1302 | pr_err("Failed to register Samsung UART driver\n"); | |
1303 | return ret; | |
1304 | } | |
1305 | } | |
1306 | ||
b497549a BD |
1307 | dbg("%s: adding port\n", __func__); |
1308 | uart_add_one_port(&s3c24xx_uart_drv, &ourport->port); | |
da121506 | 1309 | platform_set_drvdata(pdev, &ourport->port); |
b497549a | 1310 | |
0da3336f HS |
1311 | /* |
1312 | * Deactivate the clock enabled in s3c24xx_serial_init_port here, | |
1313 | * so that a potential re-enablement through the pm-callback overlaps | |
1314 | * and keeps the clock enabled in this case. | |
1315 | */ | |
1316 | clk_disable_unprepare(ourport->clk); | |
1317 | ||
30555476 BD |
1318 | ret = s3c24xx_serial_cpufreq_register(ourport); |
1319 | if (ret < 0) | |
da121506 | 1320 | dev_err(&pdev->dev, "failed to add cpufreq notifier\n"); |
30555476 | 1321 | |
b497549a | 1322 | return 0; |
b497549a BD |
1323 | } |
1324 | ||
ae8d8a14 | 1325 | static int s3c24xx_serial_remove(struct platform_device *dev) |
b497549a BD |
1326 | { |
1327 | struct uart_port *port = s3c24xx_dev_to_port(&dev->dev); | |
1328 | ||
1329 | if (port) { | |
30555476 | 1330 | s3c24xx_serial_cpufreq_deregister(to_ourport(port)); |
b497549a BD |
1331 | uart_remove_one_port(&s3c24xx_uart_drv, port); |
1332 | } | |
1333 | ||
6f134c3c TB |
1334 | uart_unregister_driver(&s3c24xx_uart_drv); |
1335 | ||
b497549a BD |
1336 | return 0; |
1337 | } | |
1338 | ||
b497549a | 1339 | /* UART power management code */ |
aef7fe52 MH |
1340 | #ifdef CONFIG_PM_SLEEP |
1341 | static int s3c24xx_serial_suspend(struct device *dev) | |
b497549a | 1342 | { |
aef7fe52 | 1343 | struct uart_port *port = s3c24xx_dev_to_port(dev); |
b497549a BD |
1344 | |
1345 | if (port) | |
1346 | uart_suspend_port(&s3c24xx_uart_drv, port); | |
1347 | ||
1348 | return 0; | |
1349 | } | |
1350 | ||
aef7fe52 | 1351 | static int s3c24xx_serial_resume(struct device *dev) |
b497549a | 1352 | { |
aef7fe52 | 1353 | struct uart_port *port = s3c24xx_dev_to_port(dev); |
b497549a BD |
1354 | struct s3c24xx_uart_port *ourport = to_ourport(port); |
1355 | ||
1356 | if (port) { | |
9484b009 | 1357 | clk_prepare_enable(ourport->clk); |
b497549a | 1358 | s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port)); |
9484b009 | 1359 | clk_disable_unprepare(ourport->clk); |
b497549a BD |
1360 | |
1361 | uart_resume_port(&s3c24xx_uart_drv, port); | |
1362 | } | |
1363 | ||
1364 | return 0; | |
1365 | } | |
aef7fe52 | 1366 | |
d09a7308 MS |
1367 | static int s3c24xx_serial_resume_noirq(struct device *dev) |
1368 | { | |
1369 | struct uart_port *port = s3c24xx_dev_to_port(dev); | |
1370 | ||
1371 | if (port) { | |
1372 | /* restore IRQ mask */ | |
1373 | if (s3c24xx_serial_has_interrupt_mask(port)) { | |
1374 | unsigned int uintm = 0xf; | |
1375 | if (tx_enabled(port)) | |
1376 | uintm &= ~S3C64XX_UINTM_TXD_MSK; | |
1377 | if (rx_enabled(port)) | |
1378 | uintm &= ~S3C64XX_UINTM_RXD_MSK; | |
1379 | wr_regl(port, S3C64XX_UINTM, uintm); | |
1380 | } | |
1381 | } | |
1382 | ||
1383 | return 0; | |
1384 | } | |
1385 | ||
aef7fe52 MH |
1386 | static const struct dev_pm_ops s3c24xx_serial_pm_ops = { |
1387 | .suspend = s3c24xx_serial_suspend, | |
1388 | .resume = s3c24xx_serial_resume, | |
d09a7308 | 1389 | .resume_noirq = s3c24xx_serial_resume_noirq, |
aef7fe52 | 1390 | }; |
b882fc1b KK |
1391 | #define SERIAL_SAMSUNG_PM_OPS (&s3c24xx_serial_pm_ops) |
1392 | ||
aef7fe52 | 1393 | #else /* !CONFIG_PM_SLEEP */ |
b882fc1b KK |
1394 | |
1395 | #define SERIAL_SAMSUNG_PM_OPS NULL | |
aef7fe52 | 1396 | #endif /* CONFIG_PM_SLEEP */ |
b497549a | 1397 | |
b497549a BD |
1398 | /* Console code */ |
1399 | ||
1400 | #ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE | |
1401 | ||
1402 | static struct uart_port *cons_uart; | |
1403 | ||
1404 | static int | |
1405 | s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon) | |
1406 | { | |
1407 | struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port); | |
1408 | unsigned long ufstat, utrstat; | |
1409 | ||
1410 | if (ufcon & S3C2410_UFCON_FIFOMODE) { | |
9ddc5b6f | 1411 | /* fifo mode - check amount of data in fifo registers... */ |
b497549a BD |
1412 | |
1413 | ufstat = rd_regl(port, S3C2410_UFSTAT); | |
1414 | return (ufstat & info->tx_fifofull) ? 0 : 1; | |
1415 | } | |
1416 | ||
1417 | /* in non-fifo mode, we go and use the tx buffer empty */ | |
1418 | ||
1419 | utrstat = rd_regl(port, S3C2410_UTRSTAT); | |
1420 | return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0; | |
1421 | } | |
1422 | ||
38adbc54 MS |
1423 | static bool |
1424 | s3c24xx_port_configured(unsigned int ucon) | |
1425 | { | |
1426 | /* consider the serial port configured if the tx/rx mode set */ | |
1427 | return (ucon & 0xf) != 0; | |
1428 | } | |
1429 | ||
93b5c032 JP |
1430 | #ifdef CONFIG_CONSOLE_POLL |
1431 | /* | |
1432 | * Console polling routines for writing and reading from the uart while | |
1433 | * in an interrupt or debug context. | |
1434 | */ | |
1435 | ||
1436 | static int s3c24xx_serial_get_poll_char(struct uart_port *port) | |
1437 | { | |
1438 | struct s3c24xx_uart_port *ourport = to_ourport(port); | |
1439 | unsigned int ufstat; | |
1440 | ||
1441 | ufstat = rd_regl(port, S3C2410_UFSTAT); | |
1442 | if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0) | |
1443 | return NO_POLL_CHAR; | |
1444 | ||
1445 | return rd_regb(port, S3C2410_URXH); | |
1446 | } | |
1447 | ||
1448 | static void s3c24xx_serial_put_poll_char(struct uart_port *port, | |
1449 | unsigned char c) | |
1450 | { | |
bb7f09ba DA |
1451 | unsigned int ufcon = rd_regl(port, S3C2410_UFCON); |
1452 | unsigned int ucon = rd_regl(port, S3C2410_UCON); | |
38adbc54 MS |
1453 | |
1454 | /* not possible to xmit on unconfigured port */ | |
1455 | if (!s3c24xx_port_configured(ucon)) | |
1456 | return; | |
93b5c032 JP |
1457 | |
1458 | while (!s3c24xx_serial_console_txrdy(port, ufcon)) | |
1459 | cpu_relax(); | |
bb7f09ba | 1460 | wr_regb(port, S3C2410_UTXH, c); |
93b5c032 JP |
1461 | } |
1462 | ||
1463 | #endif /* CONFIG_CONSOLE_POLL */ | |
1464 | ||
b497549a BD |
1465 | static void |
1466 | s3c24xx_serial_console_putchar(struct uart_port *port, int ch) | |
1467 | { | |
bb7f09ba | 1468 | unsigned int ufcon = rd_regl(port, S3C2410_UFCON); |
38adbc54 | 1469 | |
b497549a | 1470 | while (!s3c24xx_serial_console_txrdy(port, ufcon)) |
f94b0572 | 1471 | cpu_relax(); |
bb7f09ba | 1472 | wr_regb(port, S3C2410_UTXH, ch); |
b497549a BD |
1473 | } |
1474 | ||
1475 | static void | |
1476 | s3c24xx_serial_console_write(struct console *co, const char *s, | |
1477 | unsigned int count) | |
1478 | { | |
ab88c8dc DA |
1479 | unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON); |
1480 | ||
1481 | /* not possible to xmit on unconfigured port */ | |
1482 | if (!s3c24xx_port_configured(ucon)) | |
1483 | return; | |
1484 | ||
b497549a BD |
1485 | uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar); |
1486 | } | |
1487 | ||
1488 | static void __init | |
1489 | s3c24xx_serial_get_options(struct uart_port *port, int *baud, | |
1490 | int *parity, int *bits) | |
1491 | { | |
b497549a BD |
1492 | struct clk *clk; |
1493 | unsigned int ulcon; | |
1494 | unsigned int ucon; | |
1495 | unsigned int ubrdiv; | |
1496 | unsigned long rate; | |
5f5a7a55 TA |
1497 | unsigned int clk_sel; |
1498 | char clk_name[MAX_CLK_NAME_LENGTH]; | |
b497549a BD |
1499 | |
1500 | ulcon = rd_regl(port, S3C2410_ULCON); | |
1501 | ucon = rd_regl(port, S3C2410_UCON); | |
1502 | ubrdiv = rd_regl(port, S3C2410_UBRDIV); | |
1503 | ||
1504 | dbg("s3c24xx_serial_get_options: port=%p\n" | |
1505 | "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n", | |
1506 | port, ulcon, ucon, ubrdiv); | |
1507 | ||
38adbc54 | 1508 | if (s3c24xx_port_configured(ucon)) { |
b497549a BD |
1509 | switch (ulcon & S3C2410_LCON_CSMASK) { |
1510 | case S3C2410_LCON_CS5: | |
1511 | *bits = 5; | |
1512 | break; | |
1513 | case S3C2410_LCON_CS6: | |
1514 | *bits = 6; | |
1515 | break; | |
1516 | case S3C2410_LCON_CS7: | |
1517 | *bits = 7; | |
1518 | break; | |
b497549a | 1519 | case S3C2410_LCON_CS8: |
3bcce591 | 1520 | default: |
b497549a BD |
1521 | *bits = 8; |
1522 | break; | |
1523 | } | |
1524 | ||
1525 | switch (ulcon & S3C2410_LCON_PMASK) { | |
1526 | case S3C2410_LCON_PEVEN: | |
1527 | *parity = 'e'; | |
1528 | break; | |
1529 | ||
1530 | case S3C2410_LCON_PODD: | |
1531 | *parity = 'o'; | |
1532 | break; | |
1533 | ||
1534 | case S3C2410_LCON_PNONE: | |
1535 | default: | |
1536 | *parity = 'n'; | |
1537 | } | |
1538 | ||
1539 | /* now calculate the baud rate */ | |
1540 | ||
5f5a7a55 TA |
1541 | clk_sel = s3c24xx_serial_getsource(port); |
1542 | sprintf(clk_name, "clk_uart_baud%d", clk_sel); | |
b497549a | 1543 | |
5f5a7a55 | 1544 | clk = clk_get(port->dev, clk_name); |
7cd88831 | 1545 | if (!IS_ERR(clk)) |
5f5a7a55 | 1546 | rate = clk_get_rate(clk); |
b497549a BD |
1547 | else |
1548 | rate = 1; | |
1549 | ||
b497549a BD |
1550 | *baud = rate / (16 * (ubrdiv + 1)); |
1551 | dbg("calculated baud %d\n", *baud); | |
1552 | } | |
1553 | ||
1554 | } | |
1555 | ||
b497549a BD |
1556 | static int __init |
1557 | s3c24xx_serial_console_setup(struct console *co, char *options) | |
1558 | { | |
1559 | struct uart_port *port; | |
1560 | int baud = 9600; | |
1561 | int bits = 8; | |
1562 | int parity = 'n'; | |
1563 | int flow = 'n'; | |
1564 | ||
1565 | dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n", | |
1566 | co, co->index, options); | |
1567 | ||
1568 | /* is this a valid port */ | |
1569 | ||
03d5e77b | 1570 | if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS) |
b497549a BD |
1571 | co->index = 0; |
1572 | ||
1573 | port = &s3c24xx_serial_ports[co->index].port; | |
1574 | ||
1575 | /* is the port configured? */ | |
1576 | ||
ee430f16 TA |
1577 | if (port->mapbase == 0x0) |
1578 | return -ENODEV; | |
b497549a BD |
1579 | |
1580 | cons_uart = port; | |
1581 | ||
1582 | dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index); | |
1583 | ||
1584 | /* | |
1585 | * Check whether an invalid uart number has been specified, and | |
1586 | * if so, search for the first available port that does have | |
1587 | * console support. | |
1588 | */ | |
1589 | if (options) | |
1590 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
1591 | else | |
1592 | s3c24xx_serial_get_options(port, &baud, &parity, &bits); | |
1593 | ||
1594 | dbg("s3c24xx_serial_console_setup: baud %d\n", baud); | |
1595 | ||
1596 | return uart_set_options(port, co, baud, parity, bits, flow); | |
1597 | } | |
1598 | ||
b497549a BD |
1599 | static struct console s3c24xx_serial_console = { |
1600 | .name = S3C24XX_SERIAL_NAME, | |
1601 | .device = uart_console_device, | |
1602 | .flags = CON_PRINTBUFFER, | |
1603 | .index = -1, | |
1604 | .write = s3c24xx_serial_console_write, | |
5822a5df TA |
1605 | .setup = s3c24xx_serial_console_setup, |
1606 | .data = &s3c24xx_uart_drv, | |
b497549a | 1607 | }; |
da121506 TA |
1608 | #endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */ |
1609 | ||
1610 | #ifdef CONFIG_CPU_S3C2410 | |
1611 | static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = { | |
1612 | .info = &(struct s3c24xx_uart_info) { | |
1613 | .name = "Samsung S3C2410 UART", | |
1614 | .type = PORT_S3C2410, | |
1615 | .fifosize = 16, | |
1616 | .rx_fifomask = S3C2410_UFSTAT_RXMASK, | |
1617 | .rx_fifoshift = S3C2410_UFSTAT_RXSHIFT, | |
1618 | .rx_fifofull = S3C2410_UFSTAT_RXFULL, | |
1619 | .tx_fifofull = S3C2410_UFSTAT_TXFULL, | |
1620 | .tx_fifomask = S3C2410_UFSTAT_TXMASK, | |
1621 | .tx_fifoshift = S3C2410_UFSTAT_TXSHIFT, | |
1622 | .def_clk_sel = S3C2410_UCON_CLKSEL0, | |
1623 | .num_clks = 2, | |
1624 | .clksel_mask = S3C2410_UCON_CLKMASK, | |
1625 | .clksel_shift = S3C2410_UCON_CLKSHIFT, | |
1626 | }, | |
1627 | .def_cfg = &(struct s3c2410_uartcfg) { | |
1628 | .ucon = S3C2410_UCON_DEFAULT, | |
1629 | .ufcon = S3C2410_UFCON_DEFAULT, | |
1630 | }, | |
1631 | }; | |
1632 | #define S3C2410_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2410_serial_drv_data) | |
1633 | #else | |
1634 | #define S3C2410_SERIAL_DRV_DATA (kernel_ulong_t)NULL | |
1635 | #endif | |
b497549a | 1636 | |
da121506 TA |
1637 | #ifdef CONFIG_CPU_S3C2412 |
1638 | static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = { | |
1639 | .info = &(struct s3c24xx_uart_info) { | |
1640 | .name = "Samsung S3C2412 UART", | |
1641 | .type = PORT_S3C2412, | |
1642 | .fifosize = 64, | |
1643 | .has_divslot = 1, | |
1644 | .rx_fifomask = S3C2440_UFSTAT_RXMASK, | |
1645 | .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT, | |
1646 | .rx_fifofull = S3C2440_UFSTAT_RXFULL, | |
1647 | .tx_fifofull = S3C2440_UFSTAT_TXFULL, | |
1648 | .tx_fifomask = S3C2440_UFSTAT_TXMASK, | |
1649 | .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT, | |
1650 | .def_clk_sel = S3C2410_UCON_CLKSEL2, | |
1651 | .num_clks = 4, | |
1652 | .clksel_mask = S3C2412_UCON_CLKMASK, | |
1653 | .clksel_shift = S3C2412_UCON_CLKSHIFT, | |
1654 | }, | |
1655 | .def_cfg = &(struct s3c2410_uartcfg) { | |
1656 | .ucon = S3C2410_UCON_DEFAULT, | |
1657 | .ufcon = S3C2410_UFCON_DEFAULT, | |
1658 | }, | |
1659 | }; | |
1660 | #define S3C2412_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2412_serial_drv_data) | |
1661 | #else | |
1662 | #define S3C2412_SERIAL_DRV_DATA (kernel_ulong_t)NULL | |
1663 | #endif | |
b497549a | 1664 | |
da121506 | 1665 | #if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2416) || \ |
b26469a8 | 1666 | defined(CONFIG_CPU_S3C2443) || defined(CONFIG_CPU_S3C2442) |
da121506 TA |
1667 | static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = { |
1668 | .info = &(struct s3c24xx_uart_info) { | |
1669 | .name = "Samsung S3C2440 UART", | |
1670 | .type = PORT_S3C2440, | |
1671 | .fifosize = 64, | |
1672 | .has_divslot = 1, | |
1673 | .rx_fifomask = S3C2440_UFSTAT_RXMASK, | |
1674 | .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT, | |
1675 | .rx_fifofull = S3C2440_UFSTAT_RXFULL, | |
1676 | .tx_fifofull = S3C2440_UFSTAT_TXFULL, | |
1677 | .tx_fifomask = S3C2440_UFSTAT_TXMASK, | |
1678 | .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT, | |
1679 | .def_clk_sel = S3C2410_UCON_CLKSEL2, | |
1680 | .num_clks = 4, | |
1681 | .clksel_mask = S3C2412_UCON_CLKMASK, | |
1682 | .clksel_shift = S3C2412_UCON_CLKSHIFT, | |
1683 | }, | |
1684 | .def_cfg = &(struct s3c2410_uartcfg) { | |
1685 | .ucon = S3C2410_UCON_DEFAULT, | |
1686 | .ufcon = S3C2410_UFCON_DEFAULT, | |
1687 | }, | |
1688 | }; | |
1689 | #define S3C2440_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2440_serial_drv_data) | |
1690 | #else | |
1691 | #define S3C2440_SERIAL_DRV_DATA (kernel_ulong_t)NULL | |
1692 | #endif | |
b497549a | 1693 | |
953b53a7 | 1694 | #if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410) |
da121506 TA |
1695 | static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = { |
1696 | .info = &(struct s3c24xx_uart_info) { | |
1697 | .name = "Samsung S3C6400 UART", | |
1698 | .type = PORT_S3C6400, | |
1699 | .fifosize = 64, | |
1700 | .has_divslot = 1, | |
1701 | .rx_fifomask = S3C2440_UFSTAT_RXMASK, | |
1702 | .rx_fifoshift = S3C2440_UFSTAT_RXSHIFT, | |
1703 | .rx_fifofull = S3C2440_UFSTAT_RXFULL, | |
1704 | .tx_fifofull = S3C2440_UFSTAT_TXFULL, | |
1705 | .tx_fifomask = S3C2440_UFSTAT_TXMASK, | |
1706 | .tx_fifoshift = S3C2440_UFSTAT_TXSHIFT, | |
1707 | .def_clk_sel = S3C2410_UCON_CLKSEL2, | |
1708 | .num_clks = 4, | |
1709 | .clksel_mask = S3C6400_UCON_CLKMASK, | |
1710 | .clksel_shift = S3C6400_UCON_CLKSHIFT, | |
1711 | }, | |
1712 | .def_cfg = &(struct s3c2410_uartcfg) { | |
1713 | .ucon = S3C2410_UCON_DEFAULT, | |
1714 | .ufcon = S3C2410_UFCON_DEFAULT, | |
1715 | }, | |
1716 | }; | |
1717 | #define S3C6400_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c6400_serial_drv_data) | |
1718 | #else | |
1719 | #define S3C6400_SERIAL_DRV_DATA (kernel_ulong_t)NULL | |
1720 | #endif | |
b497549a | 1721 | |
da121506 TA |
1722 | #ifdef CONFIG_CPU_S5PV210 |
1723 | static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = { | |
1724 | .info = &(struct s3c24xx_uart_info) { | |
1725 | .name = "Samsung S5PV210 UART", | |
1726 | .type = PORT_S3C6400, | |
1727 | .has_divslot = 1, | |
1728 | .rx_fifomask = S5PV210_UFSTAT_RXMASK, | |
1729 | .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT, | |
1730 | .rx_fifofull = S5PV210_UFSTAT_RXFULL, | |
1731 | .tx_fifofull = S5PV210_UFSTAT_TXFULL, | |
1732 | .tx_fifomask = S5PV210_UFSTAT_TXMASK, | |
1733 | .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT, | |
1734 | .def_clk_sel = S3C2410_UCON_CLKSEL0, | |
1735 | .num_clks = 2, | |
1736 | .clksel_mask = S5PV210_UCON_CLKMASK, | |
1737 | .clksel_shift = S5PV210_UCON_CLKSHIFT, | |
1738 | }, | |
1739 | .def_cfg = &(struct s3c2410_uartcfg) { | |
1740 | .ucon = S5PV210_UCON_DEFAULT, | |
1741 | .ufcon = S5PV210_UFCON_DEFAULT, | |
1742 | }, | |
1743 | .fifosize = { 256, 64, 16, 16 }, | |
1744 | }; | |
1745 | #define S5PV210_SERIAL_DRV_DATA ((kernel_ulong_t)&s5pv210_serial_drv_data) | |
1746 | #else | |
1747 | #define S5PV210_SERIAL_DRV_DATA (kernel_ulong_t)NULL | |
1748 | #endif | |
b497549a | 1749 | |
33f88136 | 1750 | #if defined(CONFIG_ARCH_EXYNOS) |
da121506 TA |
1751 | static struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = { |
1752 | .info = &(struct s3c24xx_uart_info) { | |
1753 | .name = "Samsung Exynos4 UART", | |
1754 | .type = PORT_S3C6400, | |
1755 | .has_divslot = 1, | |
1756 | .rx_fifomask = S5PV210_UFSTAT_RXMASK, | |
1757 | .rx_fifoshift = S5PV210_UFSTAT_RXSHIFT, | |
1758 | .rx_fifofull = S5PV210_UFSTAT_RXFULL, | |
1759 | .tx_fifofull = S5PV210_UFSTAT_TXFULL, | |
1760 | .tx_fifomask = S5PV210_UFSTAT_TXMASK, | |
1761 | .tx_fifoshift = S5PV210_UFSTAT_TXSHIFT, | |
1762 | .def_clk_sel = S3C2410_UCON_CLKSEL0, | |
1763 | .num_clks = 1, | |
1764 | .clksel_mask = 0, | |
1765 | .clksel_shift = 0, | |
1766 | }, | |
1767 | .def_cfg = &(struct s3c2410_uartcfg) { | |
1768 | .ucon = S5PV210_UCON_DEFAULT, | |
1769 | .ufcon = S5PV210_UFCON_DEFAULT, | |
1770 | .has_fracval = 1, | |
1771 | }, | |
1772 | .fifosize = { 256, 64, 16, 16 }, | |
1773 | }; | |
1774 | #define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos4210_serial_drv_data) | |
1775 | #else | |
1776 | #define EXYNOS4210_SERIAL_DRV_DATA (kernel_ulong_t)NULL | |
1777 | #endif | |
b497549a | 1778 | |
da121506 TA |
1779 | static struct platform_device_id s3c24xx_serial_driver_ids[] = { |
1780 | { | |
1781 | .name = "s3c2410-uart", | |
1782 | .driver_data = S3C2410_SERIAL_DRV_DATA, | |
1783 | }, { | |
1784 | .name = "s3c2412-uart", | |
1785 | .driver_data = S3C2412_SERIAL_DRV_DATA, | |
1786 | }, { | |
1787 | .name = "s3c2440-uart", | |
1788 | .driver_data = S3C2440_SERIAL_DRV_DATA, | |
1789 | }, { | |
1790 | .name = "s3c6400-uart", | |
1791 | .driver_data = S3C6400_SERIAL_DRV_DATA, | |
1792 | }, { | |
1793 | .name = "s5pv210-uart", | |
1794 | .driver_data = S5PV210_SERIAL_DRV_DATA, | |
1795 | }, { | |
1796 | .name = "exynos4210-uart", | |
1797 | .driver_data = EXYNOS4210_SERIAL_DRV_DATA, | |
1798 | }, | |
1799 | { }, | |
1800 | }; | |
1801 | MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids); | |
1802 | ||
26c919e1 TA |
1803 | #ifdef CONFIG_OF |
1804 | static const struct of_device_id s3c24xx_uart_dt_match[] = { | |
666ca0b9 HS |
1805 | { .compatible = "samsung,s3c2410-uart", |
1806 | .data = (void *)S3C2410_SERIAL_DRV_DATA }, | |
1807 | { .compatible = "samsung,s3c2412-uart", | |
1808 | .data = (void *)S3C2412_SERIAL_DRV_DATA }, | |
1809 | { .compatible = "samsung,s3c2440-uart", | |
1810 | .data = (void *)S3C2440_SERIAL_DRV_DATA }, | |
1811 | { .compatible = "samsung,s3c6400-uart", | |
1812 | .data = (void *)S3C6400_SERIAL_DRV_DATA }, | |
1813 | { .compatible = "samsung,s5pv210-uart", | |
1814 | .data = (void *)S5PV210_SERIAL_DRV_DATA }, | |
26c919e1 | 1815 | { .compatible = "samsung,exynos4210-uart", |
a169a888 | 1816 | .data = (void *)EXYNOS4210_SERIAL_DRV_DATA }, |
26c919e1 TA |
1817 | {}, |
1818 | }; | |
1819 | MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match); | |
26c919e1 TA |
1820 | #endif |
1821 | ||
da121506 TA |
1822 | static struct platform_driver samsung_serial_driver = { |
1823 | .probe = s3c24xx_serial_probe, | |
2d47b716 | 1824 | .remove = s3c24xx_serial_remove, |
da121506 TA |
1825 | .id_table = s3c24xx_serial_driver_ids, |
1826 | .driver = { | |
1827 | .name = "samsung-uart", | |
1828 | .owner = THIS_MODULE, | |
1829 | .pm = SERIAL_SAMSUNG_PM_OPS, | |
905f4ba2 | 1830 | .of_match_table = of_match_ptr(s3c24xx_uart_dt_match), |
da121506 TA |
1831 | }, |
1832 | }; | |
b497549a | 1833 | |
6f134c3c | 1834 | module_platform_driver(samsung_serial_driver); |
b497549a | 1835 | |
da121506 | 1836 | MODULE_ALIAS("platform:samsung-uart"); |
b497549a BD |
1837 | MODULE_DESCRIPTION("Samsung SoC Serial port driver"); |
1838 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); | |
1839 | MODULE_LICENSE("GPL v2"); |