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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> | |
ee160a38 | 16 | #include <linux/tty_flip.h> |
2c7ee6ab AV |
17 | #include <linux/ioport.h> |
18 | #include <linux/init.h> | |
19 | #include <linux/serial.h> | |
20 | #include <linux/console.h> | |
21 | #include <linux/sysrq.h> | |
22 | #include <linux/device.h> | |
23 | ||
24 | #include <asm/io.h> | |
25 | #include <asm/irq.h> | |
26 | #include <asm/mach/irq.h> | |
27 | ||
a09e64fb RK |
28 | #include <mach/regs-uart.h> |
29 | #include <mach/regs-irq.h> | |
2c7ee6ab AV |
30 | |
31 | #if defined(CONFIG_SERIAL_KS8695_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
32 | #define SUPPORT_SYSRQ | |
33 | #endif | |
34 | ||
35 | #include <linux/serial_core.h> | |
36 | ||
37 | ||
38 | #define SERIAL_KS8695_MAJOR 204 | |
39 | #define SERIAL_KS8695_MINOR 16 | |
40 | #define SERIAL_KS8695_DEVNAME "ttyAM" | |
41 | ||
42 | #define SERIAL_KS8695_NR 1 | |
43 | ||
44 | /* | |
45 | * Access macros for the KS8695 UART | |
46 | */ | |
47 | #define UART_GET_CHAR(p) (__raw_readl((p)->membase + KS8695_URRB) & 0xFF) | |
48 | #define UART_PUT_CHAR(p, c) __raw_writel((c), (p)->membase + KS8695_URTH) | |
49 | #define UART_GET_FCR(p) __raw_readl((p)->membase + KS8695_URFC) | |
50 | #define UART_PUT_FCR(p, c) __raw_writel((c), (p)->membase + KS8695_URFC) | |
51 | #define UART_GET_MSR(p) __raw_readl((p)->membase + KS8695_URMS) | |
52 | #define UART_GET_LSR(p) __raw_readl((p)->membase + KS8695_URLS) | |
53 | #define UART_GET_LCR(p) __raw_readl((p)->membase + KS8695_URLC) | |
54 | #define UART_PUT_LCR(p, c) __raw_writel((c), (p)->membase + KS8695_URLC) | |
55 | #define UART_GET_MCR(p) __raw_readl((p)->membase + KS8695_URMC) | |
56 | #define UART_PUT_MCR(p, c) __raw_writel((c), (p)->membase + KS8695_URMC) | |
57 | #define UART_GET_BRDR(p) __raw_readl((p)->membase + KS8695_URBD) | |
58 | #define UART_PUT_BRDR(p, c) __raw_writel((c), (p)->membase + KS8695_URBD) | |
59 | ||
60 | #define KS8695_CLR_TX_INT() __raw_writel(1 << KS8695_IRQ_UART_TX, KS8695_IRQ_VA + KS8695_INTST) | |
61 | ||
62 | #define UART_DUMMY_LSR_RX 0x100 | |
63 | #define UART_PORT_SIZE (KS8695_USR - KS8695_URRB + 4) | |
64 | ||
457cd4f5 DH |
65 | static inline int tx_enabled(struct uart_port *port) |
66 | { | |
67 | return port->unused[0] & 1; | |
68 | } | |
69 | ||
70 | static inline int rx_enabled(struct uart_port *port) | |
71 | { | |
72 | return port->unused[0] & 2; | |
73 | } | |
74 | ||
75 | static inline int ms_enabled(struct uart_port *port) | |
76 | { | |
77 | return port->unused[0] & 4; | |
78 | } | |
79 | ||
80 | static inline void ms_enable(struct uart_port *port, int enabled) | |
81 | { | |
82 | if(enabled) | |
83 | port->unused[0] |= 4; | |
84 | else | |
85 | port->unused[0] &= ~4; | |
86 | } | |
87 | ||
88 | static inline void rx_enable(struct uart_port *port, int enabled) | |
89 | { | |
90 | if(enabled) | |
91 | port->unused[0] |= 2; | |
92 | else | |
93 | port->unused[0] &= ~2; | |
94 | } | |
95 | ||
96 | static inline void tx_enable(struct uart_port *port, int enabled) | |
97 | { | |
98 | if(enabled) | |
99 | port->unused[0] |= 1; | |
100 | else | |
101 | port->unused[0] &= ~1; | |
102 | } | |
2c7ee6ab AV |
103 | |
104 | ||
105 | #ifdef SUPPORT_SYSRQ | |
106 | static struct console ks8695_console; | |
107 | #endif | |
108 | ||
109 | static void ks8695uart_stop_tx(struct uart_port *port) | |
110 | { | |
111 | if (tx_enabled(port)) { | |
c47a830c DH |
112 | /* use disable_irq_nosync() and not disable_irq() to avoid self |
113 | * imposed deadlock by not waiting for irq handler to end, | |
114 | * since this ks8695uart_stop_tx() is called from interrupt context. | |
115 | */ | |
116 | disable_irq_nosync(KS8695_IRQ_UART_TX); | |
457cd4f5 | 117 | tx_enable(port, 0); |
2c7ee6ab AV |
118 | } |
119 | } | |
120 | ||
121 | static void ks8695uart_start_tx(struct uart_port *port) | |
122 | { | |
123 | if (!tx_enabled(port)) { | |
124 | enable_irq(KS8695_IRQ_UART_TX); | |
457cd4f5 | 125 | tx_enable(port, 1); |
2c7ee6ab AV |
126 | } |
127 | } | |
128 | ||
129 | static void ks8695uart_stop_rx(struct uart_port *port) | |
130 | { | |
131 | if (rx_enabled(port)) { | |
132 | disable_irq(KS8695_IRQ_UART_RX); | |
457cd4f5 | 133 | rx_enable(port, 0); |
2c7ee6ab AV |
134 | } |
135 | } | |
136 | ||
137 | static void ks8695uart_enable_ms(struct uart_port *port) | |
138 | { | |
457cd4f5 DH |
139 | if (!ms_enabled(port)) { |
140 | enable_irq(KS8695_IRQ_UART_MODEM_STATUS); | |
141 | ms_enable(port,1); | |
142 | } | |
2c7ee6ab AV |
143 | } |
144 | ||
145 | static void ks8695uart_disable_ms(struct uart_port *port) | |
146 | { | |
457cd4f5 DH |
147 | if (ms_enabled(port)) { |
148 | disable_irq(KS8695_IRQ_UART_MODEM_STATUS); | |
149 | ms_enable(port,0); | |
150 | } | |
2c7ee6ab AV |
151 | } |
152 | ||
153 | static irqreturn_t ks8695uart_rx_chars(int irq, void *dev_id) | |
154 | { | |
155 | struct uart_port *port = dev_id; | |
ebd2c8f6 | 156 | struct tty_struct *tty = port->state->port.tty; |
2c7ee6ab AV |
157 | unsigned int status, ch, lsr, flg, max_count = 256; |
158 | ||
159 | status = UART_GET_LSR(port); /* clears pending LSR interrupts */ | |
160 | while ((status & URLS_URDR) && max_count--) { | |
161 | ch = UART_GET_CHAR(port); | |
162 | flg = TTY_NORMAL; | |
163 | ||
164 | port->icount.rx++; | |
165 | ||
166 | /* | |
167 | * Note that the error handling code is | |
168 | * out of the main execution path | |
169 | */ | |
170 | lsr = UART_GET_LSR(port) | UART_DUMMY_LSR_RX; | |
171 | if (unlikely(lsr & (URLS_URBI | URLS_URPE | URLS_URFE | URLS_URROE))) { | |
172 | if (lsr & URLS_URBI) { | |
173 | lsr &= ~(URLS_URFE | URLS_URPE); | |
174 | port->icount.brk++; | |
175 | if (uart_handle_break(port)) | |
176 | goto ignore_char; | |
177 | } | |
178 | if (lsr & URLS_URPE) | |
179 | port->icount.parity++; | |
180 | if (lsr & URLS_URFE) | |
181 | port->icount.frame++; | |
182 | if (lsr & URLS_URROE) | |
183 | port->icount.overrun++; | |
184 | ||
185 | lsr &= port->read_status_mask; | |
186 | ||
187 | if (lsr & URLS_URBI) | |
188 | flg = TTY_BREAK; | |
189 | else if (lsr & URLS_URPE) | |
190 | flg = TTY_PARITY; | |
191 | else if (lsr & URLS_URFE) | |
192 | flg = TTY_FRAME; | |
193 | } | |
194 | ||
195 | if (uart_handle_sysrq_char(port, ch)) | |
196 | goto ignore_char; | |
197 | ||
198 | uart_insert_char(port, lsr, URLS_URROE, ch, flg); | |
199 | ||
200 | ignore_char: | |
201 | status = UART_GET_LSR(port); | |
202 | } | |
203 | tty_flip_buffer_push(tty); | |
204 | ||
205 | return IRQ_HANDLED; | |
206 | } | |
207 | ||
208 | ||
209 | static irqreturn_t ks8695uart_tx_chars(int irq, void *dev_id) | |
210 | { | |
211 | struct uart_port *port = dev_id; | |
ebd2c8f6 | 212 | struct circ_buf *xmit = &port->state->xmit; |
2c7ee6ab AV |
213 | unsigned int count; |
214 | ||
215 | if (port->x_char) { | |
216 | KS8695_CLR_TX_INT(); | |
217 | UART_PUT_CHAR(port, port->x_char); | |
218 | port->icount.tx++; | |
219 | port->x_char = 0; | |
220 | return IRQ_HANDLED; | |
221 | } | |
222 | ||
223 | if (uart_tx_stopped(port) || uart_circ_empty(xmit)) { | |
224 | ks8695uart_stop_tx(port); | |
225 | return IRQ_HANDLED; | |
226 | } | |
227 | ||
228 | count = 16; /* fifo size */ | |
229 | while (!uart_circ_empty(xmit) && (count-- > 0)) { | |
230 | KS8695_CLR_TX_INT(); | |
231 | UART_PUT_CHAR(port, xmit->buf[xmit->tail]); | |
232 | ||
233 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
234 | port->icount.tx++; | |
235 | } | |
236 | ||
237 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
238 | uart_write_wakeup(port); | |
239 | ||
240 | if (uart_circ_empty(xmit)) | |
241 | ks8695uart_stop_tx(port); | |
242 | ||
243 | return IRQ_HANDLED; | |
244 | } | |
245 | ||
246 | static irqreturn_t ks8695uart_modem_status(int irq, void *dev_id) | |
247 | { | |
248 | struct uart_port *port = dev_id; | |
249 | unsigned int status; | |
250 | ||
251 | /* | |
252 | * clear modem interrupt by reading MSR | |
253 | */ | |
254 | status = UART_GET_MSR(port); | |
255 | ||
256 | if (status & URMS_URDDCD) | |
257 | uart_handle_dcd_change(port, status & URMS_URDDCD); | |
258 | ||
259 | if (status & URMS_URDDST) | |
260 | port->icount.dsr++; | |
261 | ||
262 | if (status & URMS_URDCTS) | |
263 | uart_handle_cts_change(port, status & URMS_URDCTS); | |
264 | ||
265 | if (status & URMS_URTERI) | |
266 | port->icount.rng++; | |
267 | ||
bdc04e31 | 268 | wake_up_interruptible(&port->state->port.delta_msr_wait); |
2c7ee6ab AV |
269 | |
270 | return IRQ_HANDLED; | |
271 | } | |
272 | ||
273 | static unsigned int ks8695uart_tx_empty(struct uart_port *port) | |
274 | { | |
275 | return (UART_GET_LSR(port) & URLS_URTE) ? TIOCSER_TEMT : 0; | |
276 | } | |
277 | ||
278 | static unsigned int ks8695uart_get_mctrl(struct uart_port *port) | |
279 | { | |
280 | unsigned int result = 0; | |
281 | unsigned int status; | |
282 | ||
283 | status = UART_GET_MSR(port); | |
284 | if (status & URMS_URDCD) | |
285 | result |= TIOCM_CAR; | |
286 | if (status & URMS_URDSR) | |
287 | result |= TIOCM_DSR; | |
288 | if (status & URMS_URCTS) | |
289 | result |= TIOCM_CTS; | |
290 | if (status & URMS_URRI) | |
291 | result |= TIOCM_RI; | |
292 | ||
293 | return result; | |
294 | } | |
295 | ||
296 | static void ks8695uart_set_mctrl(struct uart_port *port, u_int mctrl) | |
297 | { | |
298 | unsigned int mcr; | |
299 | ||
300 | mcr = UART_GET_MCR(port); | |
301 | if (mctrl & TIOCM_RTS) | |
302 | mcr |= URMC_URRTS; | |
303 | else | |
304 | mcr &= ~URMC_URRTS; | |
305 | ||
306 | if (mctrl & TIOCM_DTR) | |
307 | mcr |= URMC_URDTR; | |
308 | else | |
309 | mcr &= ~URMC_URDTR; | |
310 | ||
311 | UART_PUT_MCR(port, mcr); | |
312 | } | |
313 | ||
314 | static void ks8695uart_break_ctl(struct uart_port *port, int break_state) | |
315 | { | |
316 | unsigned int lcr; | |
317 | ||
318 | lcr = UART_GET_LCR(port); | |
319 | ||
320 | if (break_state == -1) | |
321 | lcr |= URLC_URSBC; | |
322 | else | |
323 | lcr &= ~URLC_URSBC; | |
324 | ||
325 | UART_PUT_LCR(port, lcr); | |
326 | } | |
327 | ||
328 | static int ks8695uart_startup(struct uart_port *port) | |
329 | { | |
330 | int retval; | |
331 | ||
332 | set_irq_flags(KS8695_IRQ_UART_TX, IRQF_VALID | IRQF_NOAUTOEN); | |
457cd4f5 DH |
333 | tx_enable(port, 0); |
334 | rx_enable(port, 1); | |
335 | ms_enable(port, 1); | |
2c7ee6ab AV |
336 | |
337 | /* | |
338 | * Allocate the IRQ | |
339 | */ | |
340 | retval = request_irq(KS8695_IRQ_UART_TX, ks8695uart_tx_chars, IRQF_DISABLED, "UART TX", port); | |
341 | if (retval) | |
342 | goto err_tx; | |
343 | ||
344 | retval = request_irq(KS8695_IRQ_UART_RX, ks8695uart_rx_chars, IRQF_DISABLED, "UART RX", port); | |
345 | if (retval) | |
346 | goto err_rx; | |
347 | ||
348 | retval = request_irq(KS8695_IRQ_UART_LINE_STATUS, ks8695uart_rx_chars, IRQF_DISABLED, "UART LineStatus", port); | |
349 | if (retval) | |
e45c7a43 | 350 | goto err_ls; |
2c7ee6ab AV |
351 | |
352 | retval = request_irq(KS8695_IRQ_UART_MODEM_STATUS, ks8695uart_modem_status, IRQF_DISABLED, "UART ModemStatus", port); | |
353 | if (retval) | |
e45c7a43 | 354 | goto err_ms; |
2c7ee6ab AV |
355 | |
356 | return 0; | |
357 | ||
358 | err_ms: | |
359 | free_irq(KS8695_IRQ_UART_LINE_STATUS, port); | |
360 | err_ls: | |
361 | free_irq(KS8695_IRQ_UART_RX, port); | |
362 | err_rx: | |
363 | free_irq(KS8695_IRQ_UART_TX, port); | |
364 | err_tx: | |
365 | return retval; | |
366 | } | |
367 | ||
368 | static void ks8695uart_shutdown(struct uart_port *port) | |
369 | { | |
370 | /* | |
371 | * Free the interrupt | |
372 | */ | |
373 | free_irq(KS8695_IRQ_UART_RX, port); | |
374 | free_irq(KS8695_IRQ_UART_TX, port); | |
375 | free_irq(KS8695_IRQ_UART_MODEM_STATUS, port); | |
376 | free_irq(KS8695_IRQ_UART_LINE_STATUS, port); | |
377 | ||
378 | /* disable break condition and fifos */ | |
379 | UART_PUT_LCR(port, UART_GET_LCR(port) & ~URLC_URSBC); | |
380 | UART_PUT_FCR(port, UART_GET_FCR(port) & ~URFC_URFE); | |
381 | } | |
382 | ||
383 | static void ks8695uart_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old) | |
384 | { | |
385 | unsigned int lcr, fcr = 0; | |
386 | unsigned long flags; | |
387 | unsigned int baud, quot; | |
388 | ||
389 | /* | |
390 | * Ask the core to calculate the divisor for us. | |
391 | */ | |
392 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); | |
393 | quot = uart_get_divisor(port, baud); | |
394 | ||
395 | switch (termios->c_cflag & CSIZE) { | |
396 | case CS5: | |
397 | lcr = URCL_5; | |
398 | break; | |
399 | case CS6: | |
400 | lcr = URCL_6; | |
401 | break; | |
402 | case CS7: | |
403 | lcr = URCL_7; | |
404 | break; | |
405 | default: | |
406 | lcr = URCL_8; | |
407 | break; | |
408 | } | |
409 | ||
410 | /* stop bits */ | |
411 | if (termios->c_cflag & CSTOPB) | |
412 | lcr |= URLC_URSB; | |
413 | ||
414 | /* parity */ | |
415 | if (termios->c_cflag & PARENB) { | |
416 | if (termios->c_cflag & CMSPAR) { /* Mark or Space parity */ | |
417 | if (termios->c_cflag & PARODD) | |
418 | lcr |= URPE_MARK; | |
419 | else | |
420 | lcr |= URPE_SPACE; | |
421 | } | |
422 | else if (termios->c_cflag & PARODD) | |
423 | lcr |= URPE_ODD; | |
424 | else | |
425 | lcr |= URPE_EVEN; | |
426 | } | |
427 | ||
428 | if (port->fifosize > 1) | |
429 | fcr = URFC_URFRT_8 | URFC_URTFR | URFC_URRFR | URFC_URFE; | |
430 | ||
431 | spin_lock_irqsave(&port->lock, flags); | |
432 | ||
433 | /* | |
434 | * Update the per-port timeout. | |
435 | */ | |
436 | uart_update_timeout(port, termios->c_cflag, baud); | |
437 | ||
438 | port->read_status_mask = URLS_URROE; | |
439 | if (termios->c_iflag & INPCK) | |
440 | port->read_status_mask |= (URLS_URFE | URLS_URPE); | |
441 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
442 | port->read_status_mask |= URLS_URBI; | |
443 | ||
444 | /* | |
445 | * Characters to ignore | |
446 | */ | |
447 | port->ignore_status_mask = 0; | |
448 | if (termios->c_iflag & IGNPAR) | |
449 | port->ignore_status_mask |= (URLS_URFE | URLS_URPE); | |
450 | if (termios->c_iflag & IGNBRK) { | |
451 | port->ignore_status_mask |= URLS_URBI; | |
452 | /* | |
453 | * If we're ignoring parity and break indicators, | |
454 | * ignore overruns too (for real raw support). | |
455 | */ | |
456 | if (termios->c_iflag & IGNPAR) | |
457 | port->ignore_status_mask |= URLS_URROE; | |
458 | } | |
459 | ||
460 | /* | |
461 | * Ignore all characters if CREAD is not set. | |
462 | */ | |
463 | if ((termios->c_cflag & CREAD) == 0) | |
464 | port->ignore_status_mask |= UART_DUMMY_LSR_RX; | |
465 | ||
466 | /* first, disable everything */ | |
467 | if (UART_ENABLE_MS(port, termios->c_cflag)) | |
468 | ks8695uart_enable_ms(port); | |
469 | else | |
470 | ks8695uart_disable_ms(port); | |
471 | ||
472 | /* Set baud rate */ | |
473 | UART_PUT_BRDR(port, quot); | |
474 | ||
475 | UART_PUT_LCR(port, lcr); | |
476 | UART_PUT_FCR(port, fcr); | |
477 | ||
478 | spin_unlock_irqrestore(&port->lock, flags); | |
479 | } | |
480 | ||
481 | static const char *ks8695uart_type(struct uart_port *port) | |
482 | { | |
483 | return port->type == PORT_KS8695 ? "KS8695" : NULL; | |
484 | } | |
485 | ||
486 | /* | |
487 | * Release the memory region(s) being used by 'port' | |
488 | */ | |
489 | static void ks8695uart_release_port(struct uart_port *port) | |
490 | { | |
491 | release_mem_region(port->mapbase, UART_PORT_SIZE); | |
492 | } | |
493 | ||
494 | /* | |
495 | * Request the memory region(s) being used by 'port' | |
496 | */ | |
497 | static int ks8695uart_request_port(struct uart_port *port) | |
498 | { | |
499 | return request_mem_region(port->mapbase, UART_PORT_SIZE, | |
500 | "serial_ks8695") != NULL ? 0 : -EBUSY; | |
501 | } | |
502 | ||
503 | /* | |
504 | * Configure/autoconfigure the port. | |
505 | */ | |
506 | static void ks8695uart_config_port(struct uart_port *port, int flags) | |
507 | { | |
508 | if (flags & UART_CONFIG_TYPE) { | |
509 | port->type = PORT_KS8695; | |
510 | ks8695uart_request_port(port); | |
511 | } | |
512 | } | |
513 | ||
514 | /* | |
515 | * verify the new serial_struct (for TIOCSSERIAL). | |
516 | */ | |
517 | static int ks8695uart_verify_port(struct uart_port *port, struct serial_struct *ser) | |
518 | { | |
519 | int ret = 0; | |
520 | ||
521 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_KS8695) | |
522 | ret = -EINVAL; | |
523 | if (ser->irq != port->irq) | |
524 | ret = -EINVAL; | |
525 | if (ser->baud_base < 9600) | |
526 | ret = -EINVAL; | |
527 | return ret; | |
528 | } | |
529 | ||
530 | static struct uart_ops ks8695uart_pops = { | |
531 | .tx_empty = ks8695uart_tx_empty, | |
532 | .set_mctrl = ks8695uart_set_mctrl, | |
533 | .get_mctrl = ks8695uart_get_mctrl, | |
534 | .stop_tx = ks8695uart_stop_tx, | |
535 | .start_tx = ks8695uart_start_tx, | |
536 | .stop_rx = ks8695uart_stop_rx, | |
537 | .enable_ms = ks8695uart_enable_ms, | |
538 | .break_ctl = ks8695uart_break_ctl, | |
539 | .startup = ks8695uart_startup, | |
540 | .shutdown = ks8695uart_shutdown, | |
541 | .set_termios = ks8695uart_set_termios, | |
542 | .type = ks8695uart_type, | |
543 | .release_port = ks8695uart_release_port, | |
544 | .request_port = ks8695uart_request_port, | |
545 | .config_port = ks8695uart_config_port, | |
546 | .verify_port = ks8695uart_verify_port, | |
547 | }; | |
548 | ||
549 | static struct uart_port ks8695uart_ports[SERIAL_KS8695_NR] = { | |
550 | { | |
551 | .membase = (void *) KS8695_UART_VA, | |
552 | .mapbase = KS8695_UART_VA, | |
553 | .iotype = SERIAL_IO_MEM, | |
554 | .irq = KS8695_IRQ_UART_TX, | |
0a51810a | 555 | .uartclk = KS8695_CLOCK_RATE * 16, |
2c7ee6ab AV |
556 | .fifosize = 16, |
557 | .ops = &ks8695uart_pops, | |
558 | .flags = ASYNC_BOOT_AUTOCONF, | |
559 | .line = 0, | |
560 | } | |
561 | }; | |
562 | ||
563 | #ifdef CONFIG_SERIAL_KS8695_CONSOLE | |
564 | static void ks8695_console_putchar(struct uart_port *port, int ch) | |
565 | { | |
566 | while (!(UART_GET_LSR(port) & URLS_URTHRE)) | |
567 | barrier(); | |
568 | ||
569 | UART_PUT_CHAR(port, ch); | |
570 | } | |
571 | ||
572 | static void ks8695_console_write(struct console *co, const char *s, u_int count) | |
573 | { | |
574 | struct uart_port *port = ks8695uart_ports + co->index; | |
575 | ||
576 | uart_console_write(port, s, count, ks8695_console_putchar); | |
577 | } | |
578 | ||
579 | static void __init ks8695_console_get_options(struct uart_port *port, int *baud, int *parity, int *bits) | |
580 | { | |
581 | unsigned int lcr; | |
582 | ||
583 | lcr = UART_GET_LCR(port); | |
584 | ||
585 | switch (lcr & URLC_PARITY) { | |
586 | case URPE_ODD: | |
587 | *parity = 'o'; | |
588 | break; | |
589 | case URPE_EVEN: | |
590 | *parity = 'e'; | |
591 | break; | |
592 | default: | |
593 | *parity = 'n'; | |
594 | } | |
595 | ||
596 | switch (lcr & URLC_URCL) { | |
597 | case URCL_5: | |
598 | *bits = 5; | |
599 | break; | |
600 | case URCL_6: | |
601 | *bits = 6; | |
602 | break; | |
603 | case URCL_7: | |
604 | *bits = 7; | |
605 | break; | |
606 | default: | |
607 | *bits = 8; | |
608 | } | |
609 | ||
610 | *baud = port->uartclk / (UART_GET_BRDR(port) & 0x0FFF); | |
611 | *baud /= 16; | |
612 | *baud &= 0xFFFFFFF0; | |
613 | } | |
614 | ||
615 | static int __init ks8695_console_setup(struct console *co, char *options) | |
616 | { | |
617 | struct uart_port *port; | |
618 | int baud = 115200; | |
619 | int bits = 8; | |
620 | int parity = 'n'; | |
621 | int flow = 'n'; | |
622 | ||
623 | /* | |
624 | * Check whether an invalid uart number has been specified, and | |
625 | * if so, search for the first available port that does have | |
626 | * console support. | |
627 | */ | |
628 | port = uart_get_console(ks8695uart_ports, SERIAL_KS8695_NR, co); | |
629 | ||
630 | if (options) | |
631 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
632 | else | |
633 | ks8695_console_get_options(port, &baud, &parity, &bits); | |
634 | ||
635 | return uart_set_options(port, co, baud, parity, bits, flow); | |
636 | } | |
637 | ||
486cab2b | 638 | static struct uart_driver ks8695_reg; |
2c7ee6ab AV |
639 | |
640 | static struct console ks8695_console = { | |
641 | .name = SERIAL_KS8695_DEVNAME, | |
642 | .write = ks8695_console_write, | |
643 | .device = uart_console_device, | |
644 | .setup = ks8695_console_setup, | |
645 | .flags = CON_PRINTBUFFER, | |
646 | .index = -1, | |
647 | .data = &ks8695_reg, | |
648 | }; | |
649 | ||
650 | static int __init ks8695_console_init(void) | |
651 | { | |
0ad70740 | 652 | add_preferred_console(SERIAL_KS8695_DEVNAME, 0, NULL); |
2c7ee6ab AV |
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"); |