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Commit | Line | Data |
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2c7ee6ab | 1 | /* |
2c7ee6ab AV |
2 | * Driver for KS8695 serial ports |
3 | * | |
4 | * Based on drivers/serial/serial_amba.c, by Kam Lee. | |
5 | * | |
6 | * Copyright 2002-2005 Micrel Inc. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | */ | |
14 | #include <linux/module.h> | |
15 | #include <linux/tty.h> | |
16 | #include <linux/ioport.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/serial.h> | |
19 | #include <linux/console.h> | |
20 | #include <linux/sysrq.h> | |
21 | #include <linux/device.h> | |
22 | ||
23 | #include <asm/io.h> | |
24 | #include <asm/irq.h> | |
25 | #include <asm/mach/irq.h> | |
26 | ||
a09e64fb RK |
27 | #include <mach/regs-uart.h> |
28 | #include <mach/regs-irq.h> | |
2c7ee6ab AV |
29 | |
30 | #if defined(CONFIG_SERIAL_KS8695_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
31 | #define SUPPORT_SYSRQ | |
32 | #endif | |
33 | ||
34 | #include <linux/serial_core.h> | |
35 | ||
36 | ||
37 | #define SERIAL_KS8695_MAJOR 204 | |
38 | #define SERIAL_KS8695_MINOR 16 | |
39 | #define SERIAL_KS8695_DEVNAME "ttyAM" | |
40 | ||
41 | #define SERIAL_KS8695_NR 1 | |
42 | ||
43 | /* | |
44 | * Access macros for the KS8695 UART | |
45 | */ | |
46 | #define UART_GET_CHAR(p) (__raw_readl((p)->membase + KS8695_URRB) & 0xFF) | |
47 | #define UART_PUT_CHAR(p, c) __raw_writel((c), (p)->membase + KS8695_URTH) | |
48 | #define UART_GET_FCR(p) __raw_readl((p)->membase + KS8695_URFC) | |
49 | #define UART_PUT_FCR(p, c) __raw_writel((c), (p)->membase + KS8695_URFC) | |
50 | #define UART_GET_MSR(p) __raw_readl((p)->membase + KS8695_URMS) | |
51 | #define UART_GET_LSR(p) __raw_readl((p)->membase + KS8695_URLS) | |
52 | #define UART_GET_LCR(p) __raw_readl((p)->membase + KS8695_URLC) | |
53 | #define UART_PUT_LCR(p, c) __raw_writel((c), (p)->membase + KS8695_URLC) | |
54 | #define UART_GET_MCR(p) __raw_readl((p)->membase + KS8695_URMC) | |
55 | #define UART_PUT_MCR(p, c) __raw_writel((c), (p)->membase + KS8695_URMC) | |
56 | #define UART_GET_BRDR(p) __raw_readl((p)->membase + KS8695_URBD) | |
57 | #define UART_PUT_BRDR(p, c) __raw_writel((c), (p)->membase + KS8695_URBD) | |
58 | ||
59 | #define KS8695_CLR_TX_INT() __raw_writel(1 << KS8695_IRQ_UART_TX, KS8695_IRQ_VA + KS8695_INTST) | |
60 | ||
61 | #define UART_DUMMY_LSR_RX 0x100 | |
62 | #define UART_PORT_SIZE (KS8695_USR - KS8695_URRB + 4) | |
63 | ||
457cd4f5 DH |
64 | static inline int tx_enabled(struct uart_port *port) |
65 | { | |
66 | return port->unused[0] & 1; | |
67 | } | |
68 | ||
69 | static inline int rx_enabled(struct uart_port *port) | |
70 | { | |
71 | return port->unused[0] & 2; | |
72 | } | |
73 | ||
74 | static inline int ms_enabled(struct uart_port *port) | |
75 | { | |
76 | return port->unused[0] & 4; | |
77 | } | |
78 | ||
79 | static inline void ms_enable(struct uart_port *port, int enabled) | |
80 | { | |
81 | if(enabled) | |
82 | port->unused[0] |= 4; | |
83 | else | |
84 | port->unused[0] &= ~4; | |
85 | } | |
86 | ||
87 | static inline void rx_enable(struct uart_port *port, int enabled) | |
88 | { | |
89 | if(enabled) | |
90 | port->unused[0] |= 2; | |
91 | else | |
92 | port->unused[0] &= ~2; | |
93 | } | |
94 | ||
95 | static inline void tx_enable(struct uart_port *port, int enabled) | |
96 | { | |
97 | if(enabled) | |
98 | port->unused[0] |= 1; | |
99 | else | |
100 | port->unused[0] &= ~1; | |
101 | } | |
2c7ee6ab AV |
102 | |
103 | ||
104 | #ifdef SUPPORT_SYSRQ | |
105 | static struct console ks8695_console; | |
106 | #endif | |
107 | ||
108 | static void ks8695uart_stop_tx(struct uart_port *port) | |
109 | { | |
110 | if (tx_enabled(port)) { | |
c47a830c DH |
111 | /* use disable_irq_nosync() and not disable_irq() to avoid self |
112 | * imposed deadlock by not waiting for irq handler to end, | |
113 | * since this ks8695uart_stop_tx() is called from interrupt context. | |
114 | */ | |
115 | disable_irq_nosync(KS8695_IRQ_UART_TX); | |
457cd4f5 | 116 | tx_enable(port, 0); |
2c7ee6ab AV |
117 | } |
118 | } | |
119 | ||
120 | static void ks8695uart_start_tx(struct uart_port *port) | |
121 | { | |
122 | if (!tx_enabled(port)) { | |
123 | enable_irq(KS8695_IRQ_UART_TX); | |
457cd4f5 | 124 | tx_enable(port, 1); |
2c7ee6ab AV |
125 | } |
126 | } | |
127 | ||
128 | static void ks8695uart_stop_rx(struct uart_port *port) | |
129 | { | |
130 | if (rx_enabled(port)) { | |
131 | disable_irq(KS8695_IRQ_UART_RX); | |
457cd4f5 | 132 | rx_enable(port, 0); |
2c7ee6ab AV |
133 | } |
134 | } | |
135 | ||
136 | static void ks8695uart_enable_ms(struct uart_port *port) | |
137 | { | |
457cd4f5 DH |
138 | if (!ms_enabled(port)) { |
139 | enable_irq(KS8695_IRQ_UART_MODEM_STATUS); | |
140 | ms_enable(port,1); | |
141 | } | |
2c7ee6ab AV |
142 | } |
143 | ||
144 | static void ks8695uart_disable_ms(struct uart_port *port) | |
145 | { | |
457cd4f5 DH |
146 | if (ms_enabled(port)) { |
147 | disable_irq(KS8695_IRQ_UART_MODEM_STATUS); | |
148 | ms_enable(port,0); | |
149 | } | |
2c7ee6ab AV |
150 | } |
151 | ||
152 | static irqreturn_t ks8695uart_rx_chars(int irq, void *dev_id) | |
153 | { | |
154 | struct uart_port *port = dev_id; | |
ebd2c8f6 | 155 | struct tty_struct *tty = port->state->port.tty; |
2c7ee6ab AV |
156 | unsigned int status, ch, lsr, flg, max_count = 256; |
157 | ||
158 | status = UART_GET_LSR(port); /* clears pending LSR interrupts */ | |
159 | while ((status & URLS_URDR) && max_count--) { | |
160 | ch = UART_GET_CHAR(port); | |
161 | flg = TTY_NORMAL; | |
162 | ||
163 | port->icount.rx++; | |
164 | ||
165 | /* | |
166 | * Note that the error handling code is | |
167 | * out of the main execution path | |
168 | */ | |
169 | lsr = UART_GET_LSR(port) | UART_DUMMY_LSR_RX; | |
170 | if (unlikely(lsr & (URLS_URBI | URLS_URPE | URLS_URFE | URLS_URROE))) { | |
171 | if (lsr & URLS_URBI) { | |
172 | lsr &= ~(URLS_URFE | URLS_URPE); | |
173 | port->icount.brk++; | |
174 | if (uart_handle_break(port)) | |
175 | goto ignore_char; | |
176 | } | |
177 | if (lsr & URLS_URPE) | |
178 | port->icount.parity++; | |
179 | if (lsr & URLS_URFE) | |
180 | port->icount.frame++; | |
181 | if (lsr & URLS_URROE) | |
182 | port->icount.overrun++; | |
183 | ||
184 | lsr &= port->read_status_mask; | |
185 | ||
186 | if (lsr & URLS_URBI) | |
187 | flg = TTY_BREAK; | |
188 | else if (lsr & URLS_URPE) | |
189 | flg = TTY_PARITY; | |
190 | else if (lsr & URLS_URFE) | |
191 | flg = TTY_FRAME; | |
192 | } | |
193 | ||
194 | if (uart_handle_sysrq_char(port, ch)) | |
195 | goto ignore_char; | |
196 | ||
197 | uart_insert_char(port, lsr, URLS_URROE, ch, flg); | |
198 | ||
199 | ignore_char: | |
200 | status = UART_GET_LSR(port); | |
201 | } | |
202 | tty_flip_buffer_push(tty); | |
203 | ||
204 | return IRQ_HANDLED; | |
205 | } | |
206 | ||
207 | ||
208 | static irqreturn_t ks8695uart_tx_chars(int irq, void *dev_id) | |
209 | { | |
210 | struct uart_port *port = dev_id; | |
ebd2c8f6 | 211 | struct circ_buf *xmit = &port->state->xmit; |
2c7ee6ab AV |
212 | unsigned int count; |
213 | ||
214 | if (port->x_char) { | |
215 | KS8695_CLR_TX_INT(); | |
216 | UART_PUT_CHAR(port, port->x_char); | |
217 | port->icount.tx++; | |
218 | port->x_char = 0; | |
219 | return IRQ_HANDLED; | |
220 | } | |
221 | ||
222 | if (uart_tx_stopped(port) || uart_circ_empty(xmit)) { | |
223 | ks8695uart_stop_tx(port); | |
224 | return IRQ_HANDLED; | |
225 | } | |
226 | ||
227 | count = 16; /* fifo size */ | |
228 | while (!uart_circ_empty(xmit) && (count-- > 0)) { | |
229 | KS8695_CLR_TX_INT(); | |
230 | UART_PUT_CHAR(port, xmit->buf[xmit->tail]); | |
231 | ||
232 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
233 | port->icount.tx++; | |
234 | } | |
235 | ||
236 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
237 | uart_write_wakeup(port); | |
238 | ||
239 | if (uart_circ_empty(xmit)) | |
240 | ks8695uart_stop_tx(port); | |
241 | ||
242 | return IRQ_HANDLED; | |
243 | } | |
244 | ||
245 | static irqreturn_t ks8695uart_modem_status(int irq, void *dev_id) | |
246 | { | |
247 | struct uart_port *port = dev_id; | |
248 | unsigned int status; | |
249 | ||
250 | /* | |
251 | * clear modem interrupt by reading MSR | |
252 | */ | |
253 | status = UART_GET_MSR(port); | |
254 | ||
255 | if (status & URMS_URDDCD) | |
256 | uart_handle_dcd_change(port, status & URMS_URDDCD); | |
257 | ||
258 | if (status & URMS_URDDST) | |
259 | port->icount.dsr++; | |
260 | ||
261 | if (status & URMS_URDCTS) | |
262 | uart_handle_cts_change(port, status & URMS_URDCTS); | |
263 | ||
264 | if (status & URMS_URTERI) | |
265 | port->icount.rng++; | |
266 | ||
bdc04e31 | 267 | wake_up_interruptible(&port->state->port.delta_msr_wait); |
2c7ee6ab AV |
268 | |
269 | return IRQ_HANDLED; | |
270 | } | |
271 | ||
272 | static unsigned int ks8695uart_tx_empty(struct uart_port *port) | |
273 | { | |
274 | return (UART_GET_LSR(port) & URLS_URTE) ? TIOCSER_TEMT : 0; | |
275 | } | |
276 | ||
277 | static unsigned int ks8695uart_get_mctrl(struct uart_port *port) | |
278 | { | |
279 | unsigned int result = 0; | |
280 | unsigned int status; | |
281 | ||
282 | status = UART_GET_MSR(port); | |
283 | if (status & URMS_URDCD) | |
284 | result |= TIOCM_CAR; | |
285 | if (status & URMS_URDSR) | |
286 | result |= TIOCM_DSR; | |
287 | if (status & URMS_URCTS) | |
288 | result |= TIOCM_CTS; | |
289 | if (status & URMS_URRI) | |
290 | result |= TIOCM_RI; | |
291 | ||
292 | return result; | |
293 | } | |
294 | ||
295 | static void ks8695uart_set_mctrl(struct uart_port *port, u_int mctrl) | |
296 | { | |
297 | unsigned int mcr; | |
298 | ||
299 | mcr = UART_GET_MCR(port); | |
300 | if (mctrl & TIOCM_RTS) | |
301 | mcr |= URMC_URRTS; | |
302 | else | |
303 | mcr &= ~URMC_URRTS; | |
304 | ||
305 | if (mctrl & TIOCM_DTR) | |
306 | mcr |= URMC_URDTR; | |
307 | else | |
308 | mcr &= ~URMC_URDTR; | |
309 | ||
310 | UART_PUT_MCR(port, mcr); | |
311 | } | |
312 | ||
313 | static void ks8695uart_break_ctl(struct uart_port *port, int break_state) | |
314 | { | |
315 | unsigned int lcr; | |
316 | ||
317 | lcr = UART_GET_LCR(port); | |
318 | ||
319 | if (break_state == -1) | |
320 | lcr |= URLC_URSBC; | |
321 | else | |
322 | lcr &= ~URLC_URSBC; | |
323 | ||
324 | UART_PUT_LCR(port, lcr); | |
325 | } | |
326 | ||
327 | static int ks8695uart_startup(struct uart_port *port) | |
328 | { | |
329 | int retval; | |
330 | ||
331 | set_irq_flags(KS8695_IRQ_UART_TX, IRQF_VALID | IRQF_NOAUTOEN); | |
457cd4f5 DH |
332 | tx_enable(port, 0); |
333 | rx_enable(port, 1); | |
334 | ms_enable(port, 1); | |
2c7ee6ab AV |
335 | |
336 | /* | |
337 | * Allocate the IRQ | |
338 | */ | |
339 | retval = request_irq(KS8695_IRQ_UART_TX, ks8695uart_tx_chars, IRQF_DISABLED, "UART TX", port); | |
340 | if (retval) | |
341 | goto err_tx; | |
342 | ||
343 | retval = request_irq(KS8695_IRQ_UART_RX, ks8695uart_rx_chars, IRQF_DISABLED, "UART RX", port); | |
344 | if (retval) | |
345 | goto err_rx; | |
346 | ||
347 | retval = request_irq(KS8695_IRQ_UART_LINE_STATUS, ks8695uart_rx_chars, IRQF_DISABLED, "UART LineStatus", port); | |
348 | if (retval) | |
e45c7a43 | 349 | goto err_ls; |
2c7ee6ab AV |
350 | |
351 | retval = request_irq(KS8695_IRQ_UART_MODEM_STATUS, ks8695uart_modem_status, IRQF_DISABLED, "UART ModemStatus", port); | |
352 | if (retval) | |
e45c7a43 | 353 | goto err_ms; |
2c7ee6ab AV |
354 | |
355 | return 0; | |
356 | ||
357 | err_ms: | |
358 | free_irq(KS8695_IRQ_UART_LINE_STATUS, port); | |
359 | err_ls: | |
360 | free_irq(KS8695_IRQ_UART_RX, port); | |
361 | err_rx: | |
362 | free_irq(KS8695_IRQ_UART_TX, port); | |
363 | err_tx: | |
364 | return retval; | |
365 | } | |
366 | ||
367 | static void ks8695uart_shutdown(struct uart_port *port) | |
368 | { | |
369 | /* | |
370 | * Free the interrupt | |
371 | */ | |
372 | free_irq(KS8695_IRQ_UART_RX, port); | |
373 | free_irq(KS8695_IRQ_UART_TX, port); | |
374 | free_irq(KS8695_IRQ_UART_MODEM_STATUS, port); | |
375 | free_irq(KS8695_IRQ_UART_LINE_STATUS, port); | |
376 | ||
377 | /* disable break condition and fifos */ | |
378 | UART_PUT_LCR(port, UART_GET_LCR(port) & ~URLC_URSBC); | |
379 | UART_PUT_FCR(port, UART_GET_FCR(port) & ~URFC_URFE); | |
380 | } | |
381 | ||
382 | static void ks8695uart_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old) | |
383 | { | |
384 | unsigned int lcr, fcr = 0; | |
385 | unsigned long flags; | |
386 | unsigned int baud, quot; | |
387 | ||
388 | /* | |
389 | * Ask the core to calculate the divisor for us. | |
390 | */ | |
391 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); | |
392 | quot = uart_get_divisor(port, baud); | |
393 | ||
394 | switch (termios->c_cflag & CSIZE) { | |
395 | case CS5: | |
396 | lcr = URCL_5; | |
397 | break; | |
398 | case CS6: | |
399 | lcr = URCL_6; | |
400 | break; | |
401 | case CS7: | |
402 | lcr = URCL_7; | |
403 | break; | |
404 | default: | |
405 | lcr = URCL_8; | |
406 | break; | |
407 | } | |
408 | ||
409 | /* stop bits */ | |
410 | if (termios->c_cflag & CSTOPB) | |
411 | lcr |= URLC_URSB; | |
412 | ||
413 | /* parity */ | |
414 | if (termios->c_cflag & PARENB) { | |
415 | if (termios->c_cflag & CMSPAR) { /* Mark or Space parity */ | |
416 | if (termios->c_cflag & PARODD) | |
417 | lcr |= URPE_MARK; | |
418 | else | |
419 | lcr |= URPE_SPACE; | |
420 | } | |
421 | else if (termios->c_cflag & PARODD) | |
422 | lcr |= URPE_ODD; | |
423 | else | |
424 | lcr |= URPE_EVEN; | |
425 | } | |
426 | ||
427 | if (port->fifosize > 1) | |
428 | fcr = URFC_URFRT_8 | URFC_URTFR | URFC_URRFR | URFC_URFE; | |
429 | ||
430 | spin_lock_irqsave(&port->lock, flags); | |
431 | ||
432 | /* | |
433 | * Update the per-port timeout. | |
434 | */ | |
435 | uart_update_timeout(port, termios->c_cflag, baud); | |
436 | ||
437 | port->read_status_mask = URLS_URROE; | |
438 | if (termios->c_iflag & INPCK) | |
439 | port->read_status_mask |= (URLS_URFE | URLS_URPE); | |
440 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
441 | port->read_status_mask |= URLS_URBI; | |
442 | ||
443 | /* | |
444 | * Characters to ignore | |
445 | */ | |
446 | port->ignore_status_mask = 0; | |
447 | if (termios->c_iflag & IGNPAR) | |
448 | port->ignore_status_mask |= (URLS_URFE | URLS_URPE); | |
449 | if (termios->c_iflag & IGNBRK) { | |
450 | port->ignore_status_mask |= URLS_URBI; | |
451 | /* | |
452 | * If we're ignoring parity and break indicators, | |
453 | * ignore overruns too (for real raw support). | |
454 | */ | |
455 | if (termios->c_iflag & IGNPAR) | |
456 | port->ignore_status_mask |= URLS_URROE; | |
457 | } | |
458 | ||
459 | /* | |
460 | * Ignore all characters if CREAD is not set. | |
461 | */ | |
462 | if ((termios->c_cflag & CREAD) == 0) | |
463 | port->ignore_status_mask |= UART_DUMMY_LSR_RX; | |
464 | ||
465 | /* first, disable everything */ | |
466 | if (UART_ENABLE_MS(port, termios->c_cflag)) | |
467 | ks8695uart_enable_ms(port); | |
468 | else | |
469 | ks8695uart_disable_ms(port); | |
470 | ||
471 | /* Set baud rate */ | |
472 | UART_PUT_BRDR(port, quot); | |
473 | ||
474 | UART_PUT_LCR(port, lcr); | |
475 | UART_PUT_FCR(port, fcr); | |
476 | ||
477 | spin_unlock_irqrestore(&port->lock, flags); | |
478 | } | |
479 | ||
480 | static const char *ks8695uart_type(struct uart_port *port) | |
481 | { | |
482 | return port->type == PORT_KS8695 ? "KS8695" : NULL; | |
483 | } | |
484 | ||
485 | /* | |
486 | * Release the memory region(s) being used by 'port' | |
487 | */ | |
488 | static void ks8695uart_release_port(struct uart_port *port) | |
489 | { | |
490 | release_mem_region(port->mapbase, UART_PORT_SIZE); | |
491 | } | |
492 | ||
493 | /* | |
494 | * Request the memory region(s) being used by 'port' | |
495 | */ | |
496 | static int ks8695uart_request_port(struct uart_port *port) | |
497 | { | |
498 | return request_mem_region(port->mapbase, UART_PORT_SIZE, | |
499 | "serial_ks8695") != NULL ? 0 : -EBUSY; | |
500 | } | |
501 | ||
502 | /* | |
503 | * Configure/autoconfigure the port. | |
504 | */ | |
505 | static void ks8695uart_config_port(struct uart_port *port, int flags) | |
506 | { | |
507 | if (flags & UART_CONFIG_TYPE) { | |
508 | port->type = PORT_KS8695; | |
509 | ks8695uart_request_port(port); | |
510 | } | |
511 | } | |
512 | ||
513 | /* | |
514 | * verify the new serial_struct (for TIOCSSERIAL). | |
515 | */ | |
516 | static int ks8695uart_verify_port(struct uart_port *port, struct serial_struct *ser) | |
517 | { | |
518 | int ret = 0; | |
519 | ||
520 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_KS8695) | |
521 | ret = -EINVAL; | |
522 | if (ser->irq != port->irq) | |
523 | ret = -EINVAL; | |
524 | if (ser->baud_base < 9600) | |
525 | ret = -EINVAL; | |
526 | return ret; | |
527 | } | |
528 | ||
529 | static struct uart_ops ks8695uart_pops = { | |
530 | .tx_empty = ks8695uart_tx_empty, | |
531 | .set_mctrl = ks8695uart_set_mctrl, | |
532 | .get_mctrl = ks8695uart_get_mctrl, | |
533 | .stop_tx = ks8695uart_stop_tx, | |
534 | .start_tx = ks8695uart_start_tx, | |
535 | .stop_rx = ks8695uart_stop_rx, | |
536 | .enable_ms = ks8695uart_enable_ms, | |
537 | .break_ctl = ks8695uart_break_ctl, | |
538 | .startup = ks8695uart_startup, | |
539 | .shutdown = ks8695uart_shutdown, | |
540 | .set_termios = ks8695uart_set_termios, | |
541 | .type = ks8695uart_type, | |
542 | .release_port = ks8695uart_release_port, | |
543 | .request_port = ks8695uart_request_port, | |
544 | .config_port = ks8695uart_config_port, | |
545 | .verify_port = ks8695uart_verify_port, | |
546 | }; | |
547 | ||
548 | static struct uart_port ks8695uart_ports[SERIAL_KS8695_NR] = { | |
549 | { | |
550 | .membase = (void *) KS8695_UART_VA, | |
551 | .mapbase = KS8695_UART_VA, | |
552 | .iotype = SERIAL_IO_MEM, | |
553 | .irq = KS8695_IRQ_UART_TX, | |
0a51810a | 554 | .uartclk = KS8695_CLOCK_RATE * 16, |
2c7ee6ab AV |
555 | .fifosize = 16, |
556 | .ops = &ks8695uart_pops, | |
557 | .flags = ASYNC_BOOT_AUTOCONF, | |
558 | .line = 0, | |
559 | } | |
560 | }; | |
561 | ||
562 | #ifdef CONFIG_SERIAL_KS8695_CONSOLE | |
563 | static void ks8695_console_putchar(struct uart_port *port, int ch) | |
564 | { | |
565 | while (!(UART_GET_LSR(port) & URLS_URTHRE)) | |
566 | barrier(); | |
567 | ||
568 | UART_PUT_CHAR(port, ch); | |
569 | } | |
570 | ||
571 | static void ks8695_console_write(struct console *co, const char *s, u_int count) | |
572 | { | |
573 | struct uart_port *port = ks8695uart_ports + co->index; | |
574 | ||
575 | uart_console_write(port, s, count, ks8695_console_putchar); | |
576 | } | |
577 | ||
578 | static void __init ks8695_console_get_options(struct uart_port *port, int *baud, int *parity, int *bits) | |
579 | { | |
580 | unsigned int lcr; | |
581 | ||
582 | lcr = UART_GET_LCR(port); | |
583 | ||
584 | switch (lcr & URLC_PARITY) { | |
585 | case URPE_ODD: | |
586 | *parity = 'o'; | |
587 | break; | |
588 | case URPE_EVEN: | |
589 | *parity = 'e'; | |
590 | break; | |
591 | default: | |
592 | *parity = 'n'; | |
593 | } | |
594 | ||
595 | switch (lcr & URLC_URCL) { | |
596 | case URCL_5: | |
597 | *bits = 5; | |
598 | break; | |
599 | case URCL_6: | |
600 | *bits = 6; | |
601 | break; | |
602 | case URCL_7: | |
603 | *bits = 7; | |
604 | break; | |
605 | default: | |
606 | *bits = 8; | |
607 | } | |
608 | ||
609 | *baud = port->uartclk / (UART_GET_BRDR(port) & 0x0FFF); | |
610 | *baud /= 16; | |
611 | *baud &= 0xFFFFFFF0; | |
612 | } | |
613 | ||
614 | static int __init ks8695_console_setup(struct console *co, char *options) | |
615 | { | |
616 | struct uart_port *port; | |
617 | int baud = 115200; | |
618 | int bits = 8; | |
619 | int parity = 'n'; | |
620 | int flow = 'n'; | |
621 | ||
622 | /* | |
623 | * Check whether an invalid uart number has been specified, and | |
624 | * if so, search for the first available port that does have | |
625 | * console support. | |
626 | */ | |
627 | port = uart_get_console(ks8695uart_ports, SERIAL_KS8695_NR, co); | |
628 | ||
629 | if (options) | |
630 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
631 | else | |
632 | ks8695_console_get_options(port, &baud, &parity, &bits); | |
633 | ||
634 | return uart_set_options(port, co, baud, parity, bits, flow); | |
635 | } | |
636 | ||
486cab2b | 637 | static struct uart_driver ks8695_reg; |
2c7ee6ab AV |
638 | |
639 | static struct console ks8695_console = { | |
640 | .name = SERIAL_KS8695_DEVNAME, | |
641 | .write = ks8695_console_write, | |
642 | .device = uart_console_device, | |
643 | .setup = ks8695_console_setup, | |
644 | .flags = CON_PRINTBUFFER, | |
645 | .index = -1, | |
646 | .data = &ks8695_reg, | |
647 | }; | |
648 | ||
649 | static int __init ks8695_console_init(void) | |
650 | { | |
0ad70740 | 651 | add_preferred_console(SERIAL_KS8695_DEVNAME, 0, NULL); |
2c7ee6ab AV |
652 | register_console(&ks8695_console); |
653 | return 0; | |
654 | } | |
655 | ||
656 | console_initcall(ks8695_console_init); | |
657 | ||
658 | #define KS8695_CONSOLE &ks8695_console | |
659 | #else | |
660 | #define KS8695_CONSOLE NULL | |
661 | #endif | |
662 | ||
663 | static struct uart_driver ks8695_reg = { | |
664 | .owner = THIS_MODULE, | |
665 | .driver_name = "serial_ks8695", | |
666 | .dev_name = SERIAL_KS8695_DEVNAME, | |
667 | .major = SERIAL_KS8695_MAJOR, | |
668 | .minor = SERIAL_KS8695_MINOR, | |
669 | .nr = SERIAL_KS8695_NR, | |
670 | .cons = KS8695_CONSOLE, | |
671 | }; | |
672 | ||
673 | static int __init ks8695uart_init(void) | |
674 | { | |
675 | int i, ret; | |
676 | ||
677 | printk(KERN_INFO "Serial: Micrel KS8695 UART driver\n"); | |
678 | ||
679 | ret = uart_register_driver(&ks8695_reg); | |
680 | if (ret) | |
681 | return ret; | |
682 | ||
683 | for (i = 0; i < SERIAL_KS8695_NR; i++) | |
684 | uart_add_one_port(&ks8695_reg, &ks8695uart_ports[0]); | |
685 | ||
686 | return 0; | |
687 | } | |
688 | ||
689 | static void __exit ks8695uart_exit(void) | |
690 | { | |
691 | int i; | |
692 | ||
693 | for (i = 0; i < SERIAL_KS8695_NR; i++) | |
694 | uart_remove_one_port(&ks8695_reg, &ks8695uart_ports[0]); | |
695 | uart_unregister_driver(&ks8695_reg); | |
696 | } | |
697 | ||
698 | module_init(ks8695uart_init); | |
699 | module_exit(ks8695uart_exit); | |
700 | ||
701 | MODULE_DESCRIPTION("KS8695 serial port driver"); | |
702 | MODULE_AUTHOR("Micrel Inc."); | |
703 | MODULE_LICENSE("GPL"); |