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2c7ee6ab AV |
1 | /* |
2 | * drivers/serial/serial_ks8695.c | |
3 | * | |
4 | * Driver for KS8695 serial ports | |
5 | * | |
6 | * Based on drivers/serial/serial_amba.c, by Kam Lee. | |
7 | * | |
8 | * Copyright 2002-2005 Micrel Inc. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | */ | |
16 | #include <linux/module.h> | |
17 | #include <linux/tty.h> | |
18 | #include <linux/ioport.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/serial.h> | |
21 | #include <linux/console.h> | |
22 | #include <linux/sysrq.h> | |
23 | #include <linux/device.h> | |
24 | ||
25 | #include <asm/io.h> | |
26 | #include <asm/irq.h> | |
27 | #include <asm/mach/irq.h> | |
28 | ||
a09e64fb RK |
29 | #include <mach/regs-uart.h> |
30 | #include <mach/regs-irq.h> | |
2c7ee6ab AV |
31 | |
32 | #if defined(CONFIG_SERIAL_KS8695_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
33 | #define SUPPORT_SYSRQ | |
34 | #endif | |
35 | ||
36 | #include <linux/serial_core.h> | |
37 | ||
38 | ||
39 | #define SERIAL_KS8695_MAJOR 204 | |
40 | #define SERIAL_KS8695_MINOR 16 | |
41 | #define SERIAL_KS8695_DEVNAME "ttyAM" | |
42 | ||
43 | #define SERIAL_KS8695_NR 1 | |
44 | ||
45 | /* | |
46 | * Access macros for the KS8695 UART | |
47 | */ | |
48 | #define UART_GET_CHAR(p) (__raw_readl((p)->membase + KS8695_URRB) & 0xFF) | |
49 | #define UART_PUT_CHAR(p, c) __raw_writel((c), (p)->membase + KS8695_URTH) | |
50 | #define UART_GET_FCR(p) __raw_readl((p)->membase + KS8695_URFC) | |
51 | #define UART_PUT_FCR(p, c) __raw_writel((c), (p)->membase + KS8695_URFC) | |
52 | #define UART_GET_MSR(p) __raw_readl((p)->membase + KS8695_URMS) | |
53 | #define UART_GET_LSR(p) __raw_readl((p)->membase + KS8695_URLS) | |
54 | #define UART_GET_LCR(p) __raw_readl((p)->membase + KS8695_URLC) | |
55 | #define UART_PUT_LCR(p, c) __raw_writel((c), (p)->membase + KS8695_URLC) | |
56 | #define UART_GET_MCR(p) __raw_readl((p)->membase + KS8695_URMC) | |
57 | #define UART_PUT_MCR(p, c) __raw_writel((c), (p)->membase + KS8695_URMC) | |
58 | #define UART_GET_BRDR(p) __raw_readl((p)->membase + KS8695_URBD) | |
59 | #define UART_PUT_BRDR(p, c) __raw_writel((c), (p)->membase + KS8695_URBD) | |
60 | ||
61 | #define KS8695_CLR_TX_INT() __raw_writel(1 << KS8695_IRQ_UART_TX, KS8695_IRQ_VA + KS8695_INTST) | |
62 | ||
63 | #define UART_DUMMY_LSR_RX 0x100 | |
64 | #define UART_PORT_SIZE (KS8695_USR - KS8695_URRB + 4) | |
65 | ||
457cd4f5 DH |
66 | static inline int tx_enabled(struct uart_port *port) |
67 | { | |
68 | return port->unused[0] & 1; | |
69 | } | |
70 | ||
71 | static inline int rx_enabled(struct uart_port *port) | |
72 | { | |
73 | return port->unused[0] & 2; | |
74 | } | |
75 | ||
76 | static inline int ms_enabled(struct uart_port *port) | |
77 | { | |
78 | return port->unused[0] & 4; | |
79 | } | |
80 | ||
81 | static inline void ms_enable(struct uart_port *port, int enabled) | |
82 | { | |
83 | if(enabled) | |
84 | port->unused[0] |= 4; | |
85 | else | |
86 | port->unused[0] &= ~4; | |
87 | } | |
88 | ||
89 | static inline void rx_enable(struct uart_port *port, int enabled) | |
90 | { | |
91 | if(enabled) | |
92 | port->unused[0] |= 2; | |
93 | else | |
94 | port->unused[0] &= ~2; | |
95 | } | |
96 | ||
97 | static inline void tx_enable(struct uart_port *port, int enabled) | |
98 | { | |
99 | if(enabled) | |
100 | port->unused[0] |= 1; | |
101 | else | |
102 | port->unused[0] &= ~1; | |
103 | } | |
2c7ee6ab AV |
104 | |
105 | ||
106 | #ifdef SUPPORT_SYSRQ | |
107 | static struct console ks8695_console; | |
108 | #endif | |
109 | ||
110 | static void ks8695uart_stop_tx(struct uart_port *port) | |
111 | { | |
112 | if (tx_enabled(port)) { | |
c47a830c DH |
113 | /* use disable_irq_nosync() and not disable_irq() to avoid self |
114 | * imposed deadlock by not waiting for irq handler to end, | |
115 | * since this ks8695uart_stop_tx() is called from interrupt context. | |
116 | */ | |
117 | disable_irq_nosync(KS8695_IRQ_UART_TX); | |
457cd4f5 | 118 | tx_enable(port, 0); |
2c7ee6ab AV |
119 | } |
120 | } | |
121 | ||
122 | static void ks8695uart_start_tx(struct uart_port *port) | |
123 | { | |
124 | if (!tx_enabled(port)) { | |
125 | enable_irq(KS8695_IRQ_UART_TX); | |
457cd4f5 | 126 | tx_enable(port, 1); |
2c7ee6ab AV |
127 | } |
128 | } | |
129 | ||
130 | static void ks8695uart_stop_rx(struct uart_port *port) | |
131 | { | |
132 | if (rx_enabled(port)) { | |
133 | disable_irq(KS8695_IRQ_UART_RX); | |
457cd4f5 | 134 | rx_enable(port, 0); |
2c7ee6ab AV |
135 | } |
136 | } | |
137 | ||
138 | static void ks8695uart_enable_ms(struct uart_port *port) | |
139 | { | |
457cd4f5 DH |
140 | if (!ms_enabled(port)) { |
141 | enable_irq(KS8695_IRQ_UART_MODEM_STATUS); | |
142 | ms_enable(port,1); | |
143 | } | |
2c7ee6ab AV |
144 | } |
145 | ||
146 | static void ks8695uart_disable_ms(struct uart_port *port) | |
147 | { | |
457cd4f5 DH |
148 | if (ms_enabled(port)) { |
149 | disable_irq(KS8695_IRQ_UART_MODEM_STATUS); | |
150 | ms_enable(port,0); | |
151 | } | |
2c7ee6ab AV |
152 | } |
153 | ||
154 | static irqreturn_t ks8695uart_rx_chars(int irq, void *dev_id) | |
155 | { | |
156 | struct uart_port *port = dev_id; | |
ebd2c8f6 | 157 | struct tty_struct *tty = port->state->port.tty; |
2c7ee6ab AV |
158 | unsigned int status, ch, lsr, flg, max_count = 256; |
159 | ||
160 | status = UART_GET_LSR(port); /* clears pending LSR interrupts */ | |
161 | while ((status & URLS_URDR) && max_count--) { | |
162 | ch = UART_GET_CHAR(port); | |
163 | flg = TTY_NORMAL; | |
164 | ||
165 | port->icount.rx++; | |
166 | ||
167 | /* | |
168 | * Note that the error handling code is | |
169 | * out of the main execution path | |
170 | */ | |
171 | lsr = UART_GET_LSR(port) | UART_DUMMY_LSR_RX; | |
172 | if (unlikely(lsr & (URLS_URBI | URLS_URPE | URLS_URFE | URLS_URROE))) { | |
173 | if (lsr & URLS_URBI) { | |
174 | lsr &= ~(URLS_URFE | URLS_URPE); | |
175 | port->icount.brk++; | |
176 | if (uart_handle_break(port)) | |
177 | goto ignore_char; | |
178 | } | |
179 | if (lsr & URLS_URPE) | |
180 | port->icount.parity++; | |
181 | if (lsr & URLS_URFE) | |
182 | port->icount.frame++; | |
183 | if (lsr & URLS_URROE) | |
184 | port->icount.overrun++; | |
185 | ||
186 | lsr &= port->read_status_mask; | |
187 | ||
188 | if (lsr & URLS_URBI) | |
189 | flg = TTY_BREAK; | |
190 | else if (lsr & URLS_URPE) | |
191 | flg = TTY_PARITY; | |
192 | else if (lsr & URLS_URFE) | |
193 | flg = TTY_FRAME; | |
194 | } | |
195 | ||
196 | if (uart_handle_sysrq_char(port, ch)) | |
197 | goto ignore_char; | |
198 | ||
199 | uart_insert_char(port, lsr, URLS_URROE, ch, flg); | |
200 | ||
201 | ignore_char: | |
202 | status = UART_GET_LSR(port); | |
203 | } | |
204 | tty_flip_buffer_push(tty); | |
205 | ||
206 | return IRQ_HANDLED; | |
207 | } | |
208 | ||
209 | ||
210 | static irqreturn_t ks8695uart_tx_chars(int irq, void *dev_id) | |
211 | { | |
212 | struct uart_port *port = dev_id; | |
ebd2c8f6 | 213 | struct circ_buf *xmit = &port->state->xmit; |
2c7ee6ab AV |
214 | unsigned int count; |
215 | ||
216 | if (port->x_char) { | |
217 | KS8695_CLR_TX_INT(); | |
218 | UART_PUT_CHAR(port, port->x_char); | |
219 | port->icount.tx++; | |
220 | port->x_char = 0; | |
221 | return IRQ_HANDLED; | |
222 | } | |
223 | ||
224 | if (uart_tx_stopped(port) || uart_circ_empty(xmit)) { | |
225 | ks8695uart_stop_tx(port); | |
226 | return IRQ_HANDLED; | |
227 | } | |
228 | ||
229 | count = 16; /* fifo size */ | |
230 | while (!uart_circ_empty(xmit) && (count-- > 0)) { | |
231 | KS8695_CLR_TX_INT(); | |
232 | UART_PUT_CHAR(port, xmit->buf[xmit->tail]); | |
233 | ||
234 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
235 | port->icount.tx++; | |
236 | } | |
237 | ||
238 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
239 | uart_write_wakeup(port); | |
240 | ||
241 | if (uart_circ_empty(xmit)) | |
242 | ks8695uart_stop_tx(port); | |
243 | ||
244 | return IRQ_HANDLED; | |
245 | } | |
246 | ||
247 | static irqreturn_t ks8695uart_modem_status(int irq, void *dev_id) | |
248 | { | |
249 | struct uart_port *port = dev_id; | |
250 | unsigned int status; | |
251 | ||
252 | /* | |
253 | * clear modem interrupt by reading MSR | |
254 | */ | |
255 | status = UART_GET_MSR(port); | |
256 | ||
257 | if (status & URMS_URDDCD) | |
258 | uart_handle_dcd_change(port, status & URMS_URDDCD); | |
259 | ||
260 | if (status & URMS_URDDST) | |
261 | port->icount.dsr++; | |
262 | ||
263 | if (status & URMS_URDCTS) | |
264 | uart_handle_cts_change(port, status & URMS_URDCTS); | |
265 | ||
266 | if (status & URMS_URTERI) | |
267 | port->icount.rng++; | |
268 | ||
bdc04e31 | 269 | wake_up_interruptible(&port->state->port.delta_msr_wait); |
2c7ee6ab AV |
270 | |
271 | return IRQ_HANDLED; | |
272 | } | |
273 | ||
274 | static unsigned int ks8695uart_tx_empty(struct uart_port *port) | |
275 | { | |
276 | return (UART_GET_LSR(port) & URLS_URTE) ? TIOCSER_TEMT : 0; | |
277 | } | |
278 | ||
279 | static unsigned int ks8695uart_get_mctrl(struct uart_port *port) | |
280 | { | |
281 | unsigned int result = 0; | |
282 | unsigned int status; | |
283 | ||
284 | status = UART_GET_MSR(port); | |
285 | if (status & URMS_URDCD) | |
286 | result |= TIOCM_CAR; | |
287 | if (status & URMS_URDSR) | |
288 | result |= TIOCM_DSR; | |
289 | if (status & URMS_URCTS) | |
290 | result |= TIOCM_CTS; | |
291 | if (status & URMS_URRI) | |
292 | result |= TIOCM_RI; | |
293 | ||
294 | return result; | |
295 | } | |
296 | ||
297 | static void ks8695uart_set_mctrl(struct uart_port *port, u_int mctrl) | |
298 | { | |
299 | unsigned int mcr; | |
300 | ||
301 | mcr = UART_GET_MCR(port); | |
302 | if (mctrl & TIOCM_RTS) | |
303 | mcr |= URMC_URRTS; | |
304 | else | |
305 | mcr &= ~URMC_URRTS; | |
306 | ||
307 | if (mctrl & TIOCM_DTR) | |
308 | mcr |= URMC_URDTR; | |
309 | else | |
310 | mcr &= ~URMC_URDTR; | |
311 | ||
312 | UART_PUT_MCR(port, mcr); | |
313 | } | |
314 | ||
315 | static void ks8695uart_break_ctl(struct uart_port *port, int break_state) | |
316 | { | |
317 | unsigned int lcr; | |
318 | ||
319 | lcr = UART_GET_LCR(port); | |
320 | ||
321 | if (break_state == -1) | |
322 | lcr |= URLC_URSBC; | |
323 | else | |
324 | lcr &= ~URLC_URSBC; | |
325 | ||
326 | UART_PUT_LCR(port, lcr); | |
327 | } | |
328 | ||
329 | static int ks8695uart_startup(struct uart_port *port) | |
330 | { | |
331 | int retval; | |
332 | ||
333 | set_irq_flags(KS8695_IRQ_UART_TX, IRQF_VALID | IRQF_NOAUTOEN); | |
457cd4f5 DH |
334 | tx_enable(port, 0); |
335 | rx_enable(port, 1); | |
336 | ms_enable(port, 1); | |
2c7ee6ab AV |
337 | |
338 | /* | |
339 | * Allocate the IRQ | |
340 | */ | |
341 | retval = request_irq(KS8695_IRQ_UART_TX, ks8695uart_tx_chars, IRQF_DISABLED, "UART TX", port); | |
342 | if (retval) | |
343 | goto err_tx; | |
344 | ||
345 | retval = request_irq(KS8695_IRQ_UART_RX, ks8695uart_rx_chars, IRQF_DISABLED, "UART RX", port); | |
346 | if (retval) | |
347 | goto err_rx; | |
348 | ||
349 | retval = request_irq(KS8695_IRQ_UART_LINE_STATUS, ks8695uart_rx_chars, IRQF_DISABLED, "UART LineStatus", port); | |
350 | if (retval) | |
e45c7a43 | 351 | goto err_ls; |
2c7ee6ab AV |
352 | |
353 | retval = request_irq(KS8695_IRQ_UART_MODEM_STATUS, ks8695uart_modem_status, IRQF_DISABLED, "UART ModemStatus", port); | |
354 | if (retval) | |
e45c7a43 | 355 | goto err_ms; |
2c7ee6ab AV |
356 | |
357 | return 0; | |
358 | ||
359 | err_ms: | |
360 | free_irq(KS8695_IRQ_UART_LINE_STATUS, port); | |
361 | err_ls: | |
362 | free_irq(KS8695_IRQ_UART_RX, port); | |
363 | err_rx: | |
364 | free_irq(KS8695_IRQ_UART_TX, port); | |
365 | err_tx: | |
366 | return retval; | |
367 | } | |
368 | ||
369 | static void ks8695uart_shutdown(struct uart_port *port) | |
370 | { | |
371 | /* | |
372 | * Free the interrupt | |
373 | */ | |
374 | free_irq(KS8695_IRQ_UART_RX, port); | |
375 | free_irq(KS8695_IRQ_UART_TX, port); | |
376 | free_irq(KS8695_IRQ_UART_MODEM_STATUS, port); | |
377 | free_irq(KS8695_IRQ_UART_LINE_STATUS, port); | |
378 | ||
379 | /* disable break condition and fifos */ | |
380 | UART_PUT_LCR(port, UART_GET_LCR(port) & ~URLC_URSBC); | |
381 | UART_PUT_FCR(port, UART_GET_FCR(port) & ~URFC_URFE); | |
382 | } | |
383 | ||
384 | static void ks8695uart_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old) | |
385 | { | |
386 | unsigned int lcr, fcr = 0; | |
387 | unsigned long flags; | |
388 | unsigned int baud, quot; | |
389 | ||
390 | /* | |
391 | * Ask the core to calculate the divisor for us. | |
392 | */ | |
393 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); | |
394 | quot = uart_get_divisor(port, baud); | |
395 | ||
396 | switch (termios->c_cflag & CSIZE) { | |
397 | case CS5: | |
398 | lcr = URCL_5; | |
399 | break; | |
400 | case CS6: | |
401 | lcr = URCL_6; | |
402 | break; | |
403 | case CS7: | |
404 | lcr = URCL_7; | |
405 | break; | |
406 | default: | |
407 | lcr = URCL_8; | |
408 | break; | |
409 | } | |
410 | ||
411 | /* stop bits */ | |
412 | if (termios->c_cflag & CSTOPB) | |
413 | lcr |= URLC_URSB; | |
414 | ||
415 | /* parity */ | |
416 | if (termios->c_cflag & PARENB) { | |
417 | if (termios->c_cflag & CMSPAR) { /* Mark or Space parity */ | |
418 | if (termios->c_cflag & PARODD) | |
419 | lcr |= URPE_MARK; | |
420 | else | |
421 | lcr |= URPE_SPACE; | |
422 | } | |
423 | else if (termios->c_cflag & PARODD) | |
424 | lcr |= URPE_ODD; | |
425 | else | |
426 | lcr |= URPE_EVEN; | |
427 | } | |
428 | ||
429 | if (port->fifosize > 1) | |
430 | fcr = URFC_URFRT_8 | URFC_URTFR | URFC_URRFR | URFC_URFE; | |
431 | ||
432 | spin_lock_irqsave(&port->lock, flags); | |
433 | ||
434 | /* | |
435 | * Update the per-port timeout. | |
436 | */ | |
437 | uart_update_timeout(port, termios->c_cflag, baud); | |
438 | ||
439 | port->read_status_mask = URLS_URROE; | |
440 | if (termios->c_iflag & INPCK) | |
441 | port->read_status_mask |= (URLS_URFE | URLS_URPE); | |
442 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
443 | port->read_status_mask |= URLS_URBI; | |
444 | ||
445 | /* | |
446 | * Characters to ignore | |
447 | */ | |
448 | port->ignore_status_mask = 0; | |
449 | if (termios->c_iflag & IGNPAR) | |
450 | port->ignore_status_mask |= (URLS_URFE | URLS_URPE); | |
451 | if (termios->c_iflag & IGNBRK) { | |
452 | port->ignore_status_mask |= URLS_URBI; | |
453 | /* | |
454 | * If we're ignoring parity and break indicators, | |
455 | * ignore overruns too (for real raw support). | |
456 | */ | |
457 | if (termios->c_iflag & IGNPAR) | |
458 | port->ignore_status_mask |= URLS_URROE; | |
459 | } | |
460 | ||
461 | /* | |
462 | * Ignore all characters if CREAD is not set. | |
463 | */ | |
464 | if ((termios->c_cflag & CREAD) == 0) | |
465 | port->ignore_status_mask |= UART_DUMMY_LSR_RX; | |
466 | ||
467 | /* first, disable everything */ | |
468 | if (UART_ENABLE_MS(port, termios->c_cflag)) | |
469 | ks8695uart_enable_ms(port); | |
470 | else | |
471 | ks8695uart_disable_ms(port); | |
472 | ||
473 | /* Set baud rate */ | |
474 | UART_PUT_BRDR(port, quot); | |
475 | ||
476 | UART_PUT_LCR(port, lcr); | |
477 | UART_PUT_FCR(port, fcr); | |
478 | ||
479 | spin_unlock_irqrestore(&port->lock, flags); | |
480 | } | |
481 | ||
482 | static const char *ks8695uart_type(struct uart_port *port) | |
483 | { | |
484 | return port->type == PORT_KS8695 ? "KS8695" : NULL; | |
485 | } | |
486 | ||
487 | /* | |
488 | * Release the memory region(s) being used by 'port' | |
489 | */ | |
490 | static void ks8695uart_release_port(struct uart_port *port) | |
491 | { | |
492 | release_mem_region(port->mapbase, UART_PORT_SIZE); | |
493 | } | |
494 | ||
495 | /* | |
496 | * Request the memory region(s) being used by 'port' | |
497 | */ | |
498 | static int ks8695uart_request_port(struct uart_port *port) | |
499 | { | |
500 | return request_mem_region(port->mapbase, UART_PORT_SIZE, | |
501 | "serial_ks8695") != NULL ? 0 : -EBUSY; | |
502 | } | |
503 | ||
504 | /* | |
505 | * Configure/autoconfigure the port. | |
506 | */ | |
507 | static void ks8695uart_config_port(struct uart_port *port, int flags) | |
508 | { | |
509 | if (flags & UART_CONFIG_TYPE) { | |
510 | port->type = PORT_KS8695; | |
511 | ks8695uart_request_port(port); | |
512 | } | |
513 | } | |
514 | ||
515 | /* | |
516 | * verify the new serial_struct (for TIOCSSERIAL). | |
517 | */ | |
518 | static int ks8695uart_verify_port(struct uart_port *port, struct serial_struct *ser) | |
519 | { | |
520 | int ret = 0; | |
521 | ||
522 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_KS8695) | |
523 | ret = -EINVAL; | |
524 | if (ser->irq != port->irq) | |
525 | ret = -EINVAL; | |
526 | if (ser->baud_base < 9600) | |
527 | ret = -EINVAL; | |
528 | return ret; | |
529 | } | |
530 | ||
531 | static struct uart_ops ks8695uart_pops = { | |
532 | .tx_empty = ks8695uart_tx_empty, | |
533 | .set_mctrl = ks8695uart_set_mctrl, | |
534 | .get_mctrl = ks8695uart_get_mctrl, | |
535 | .stop_tx = ks8695uart_stop_tx, | |
536 | .start_tx = ks8695uart_start_tx, | |
537 | .stop_rx = ks8695uart_stop_rx, | |
538 | .enable_ms = ks8695uart_enable_ms, | |
539 | .break_ctl = ks8695uart_break_ctl, | |
540 | .startup = ks8695uart_startup, | |
541 | .shutdown = ks8695uart_shutdown, | |
542 | .set_termios = ks8695uart_set_termios, | |
543 | .type = ks8695uart_type, | |
544 | .release_port = ks8695uart_release_port, | |
545 | .request_port = ks8695uart_request_port, | |
546 | .config_port = ks8695uart_config_port, | |
547 | .verify_port = ks8695uart_verify_port, | |
548 | }; | |
549 | ||
550 | static struct uart_port ks8695uart_ports[SERIAL_KS8695_NR] = { | |
551 | { | |
552 | .membase = (void *) KS8695_UART_VA, | |
553 | .mapbase = KS8695_UART_VA, | |
554 | .iotype = SERIAL_IO_MEM, | |
555 | .irq = KS8695_IRQ_UART_TX, | |
0a51810a | 556 | .uartclk = KS8695_CLOCK_RATE * 16, |
2c7ee6ab AV |
557 | .fifosize = 16, |
558 | .ops = &ks8695uart_pops, | |
559 | .flags = ASYNC_BOOT_AUTOCONF, | |
560 | .line = 0, | |
561 | } | |
562 | }; | |
563 | ||
564 | #ifdef CONFIG_SERIAL_KS8695_CONSOLE | |
565 | static void ks8695_console_putchar(struct uart_port *port, int ch) | |
566 | { | |
567 | while (!(UART_GET_LSR(port) & URLS_URTHRE)) | |
568 | barrier(); | |
569 | ||
570 | UART_PUT_CHAR(port, ch); | |
571 | } | |
572 | ||
573 | static void ks8695_console_write(struct console *co, const char *s, u_int count) | |
574 | { | |
575 | struct uart_port *port = ks8695uart_ports + co->index; | |
576 | ||
577 | uart_console_write(port, s, count, ks8695_console_putchar); | |
578 | } | |
579 | ||
580 | static void __init ks8695_console_get_options(struct uart_port *port, int *baud, int *parity, int *bits) | |
581 | { | |
582 | unsigned int lcr; | |
583 | ||
584 | lcr = UART_GET_LCR(port); | |
585 | ||
586 | switch (lcr & URLC_PARITY) { | |
587 | case URPE_ODD: | |
588 | *parity = 'o'; | |
589 | break; | |
590 | case URPE_EVEN: | |
591 | *parity = 'e'; | |
592 | break; | |
593 | default: | |
594 | *parity = 'n'; | |
595 | } | |
596 | ||
597 | switch (lcr & URLC_URCL) { | |
598 | case URCL_5: | |
599 | *bits = 5; | |
600 | break; | |
601 | case URCL_6: | |
602 | *bits = 6; | |
603 | break; | |
604 | case URCL_7: | |
605 | *bits = 7; | |
606 | break; | |
607 | default: | |
608 | *bits = 8; | |
609 | } | |
610 | ||
611 | *baud = port->uartclk / (UART_GET_BRDR(port) & 0x0FFF); | |
612 | *baud /= 16; | |
613 | *baud &= 0xFFFFFFF0; | |
614 | } | |
615 | ||
616 | static int __init ks8695_console_setup(struct console *co, char *options) | |
617 | { | |
618 | struct uart_port *port; | |
619 | int baud = 115200; | |
620 | int bits = 8; | |
621 | int parity = 'n'; | |
622 | int flow = 'n'; | |
623 | ||
624 | /* | |
625 | * Check whether an invalid uart number has been specified, and | |
626 | * if so, search for the first available port that does have | |
627 | * console support. | |
628 | */ | |
629 | port = uart_get_console(ks8695uart_ports, SERIAL_KS8695_NR, co); | |
630 | ||
631 | if (options) | |
632 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
633 | else | |
634 | ks8695_console_get_options(port, &baud, &parity, &bits); | |
635 | ||
636 | return uart_set_options(port, co, baud, parity, bits, flow); | |
637 | } | |
638 | ||
486cab2b | 639 | static struct uart_driver ks8695_reg; |
2c7ee6ab AV |
640 | |
641 | static struct console ks8695_console = { | |
642 | .name = SERIAL_KS8695_DEVNAME, | |
643 | .write = ks8695_console_write, | |
644 | .device = uart_console_device, | |
645 | .setup = ks8695_console_setup, | |
646 | .flags = CON_PRINTBUFFER, | |
647 | .index = -1, | |
648 | .data = &ks8695_reg, | |
649 | }; | |
650 | ||
651 | static int __init ks8695_console_init(void) | |
652 | { | |
653 | register_console(&ks8695_console); | |
654 | return 0; | |
655 | } | |
656 | ||
657 | console_initcall(ks8695_console_init); | |
658 | ||
659 | #define KS8695_CONSOLE &ks8695_console | |
660 | #else | |
661 | #define KS8695_CONSOLE NULL | |
662 | #endif | |
663 | ||
664 | static struct uart_driver ks8695_reg = { | |
665 | .owner = THIS_MODULE, | |
666 | .driver_name = "serial_ks8695", | |
667 | .dev_name = SERIAL_KS8695_DEVNAME, | |
668 | .major = SERIAL_KS8695_MAJOR, | |
669 | .minor = SERIAL_KS8695_MINOR, | |
670 | .nr = SERIAL_KS8695_NR, | |
671 | .cons = KS8695_CONSOLE, | |
672 | }; | |
673 | ||
674 | static int __init ks8695uart_init(void) | |
675 | { | |
676 | int i, ret; | |
677 | ||
678 | printk(KERN_INFO "Serial: Micrel KS8695 UART driver\n"); | |
679 | ||
680 | ret = uart_register_driver(&ks8695_reg); | |
681 | if (ret) | |
682 | return ret; | |
683 | ||
684 | for (i = 0; i < SERIAL_KS8695_NR; i++) | |
685 | uart_add_one_port(&ks8695_reg, &ks8695uart_ports[0]); | |
686 | ||
687 | return 0; | |
688 | } | |
689 | ||
690 | static void __exit ks8695uart_exit(void) | |
691 | { | |
692 | int i; | |
693 | ||
694 | for (i = 0; i < SERIAL_KS8695_NR; i++) | |
695 | uart_remove_one_port(&ks8695_reg, &ks8695uart_ports[0]); | |
696 | uart_unregister_driver(&ks8695_reg); | |
697 | } | |
698 | ||
699 | module_init(ks8695uart_init); | |
700 | module_exit(ks8695uart_exit); | |
701 | ||
702 | MODULE_DESCRIPTION("KS8695 serial port driver"); | |
703 | MODULE_AUTHOR("Micrel Inc."); | |
704 | MODULE_LICENSE("GPL"); |