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1da177e4 LT |
1 | /* |
2 | * linux/drivers/serial/imx.c | |
3 | * | |
4 | * Driver for Motorola IMX serial ports | |
5 | * | |
6 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. | |
7 | * | |
8 | * Author: Sascha Hauer <sascha@saschahauer.de> | |
9 | * Copyright (C) 2004 Pengutronix | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
24 | * | |
25 | * [29-Mar-2005] Mike Lee | |
26 | * Added hardware handshake | |
27 | */ | |
28 | #include <linux/config.h> | |
29 | ||
30 | #if defined(CONFIG_SERIAL_IMX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
31 | #define SUPPORT_SYSRQ | |
32 | #endif | |
33 | ||
34 | #include <linux/module.h> | |
35 | #include <linux/ioport.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/console.h> | |
38 | #include <linux/sysrq.h> | |
39 | #include <linux/device.h> | |
40 | #include <linux/tty.h> | |
41 | #include <linux/tty_flip.h> | |
42 | #include <linux/serial_core.h> | |
43 | #include <linux/serial.h> | |
44 | ||
45 | #include <asm/io.h> | |
46 | #include <asm/irq.h> | |
47 | #include <asm/hardware.h> | |
48 | ||
49 | /* We've been assigned a range on the "Low-density serial ports" major */ | |
50 | #define SERIAL_IMX_MAJOR 204 | |
51 | #define MINOR_START 41 | |
52 | ||
53 | #define NR_PORTS 2 | |
54 | ||
55 | #define IMX_ISR_PASS_LIMIT 256 | |
56 | ||
57 | /* | |
58 | * This is the size of our serial port register set. | |
59 | */ | |
60 | #define UART_PORT_SIZE 0x100 | |
61 | ||
62 | /* | |
63 | * This determines how often we check the modem status signals | |
64 | * for any change. They generally aren't connected to an IRQ | |
65 | * so we have to poll them. We also check immediately before | |
66 | * filling the TX fifo incase CTS has been dropped. | |
67 | */ | |
68 | #define MCTRL_TIMEOUT (250*HZ/1000) | |
69 | ||
70 | #define DRIVER_NAME "IMX-uart" | |
71 | ||
72 | struct imx_port { | |
73 | struct uart_port port; | |
74 | struct timer_list timer; | |
75 | unsigned int old_status; | |
76 | int txirq,rxirq; | |
77 | }; | |
78 | ||
79 | /* | |
80 | * Handle any change of modem status signal since we were last called. | |
81 | */ | |
82 | static void imx_mctrl_check(struct imx_port *sport) | |
83 | { | |
84 | unsigned int status, changed; | |
85 | ||
86 | status = sport->port.ops->get_mctrl(&sport->port); | |
87 | changed = status ^ sport->old_status; | |
88 | ||
89 | if (changed == 0) | |
90 | return; | |
91 | ||
92 | sport->old_status = status; | |
93 | ||
94 | if (changed & TIOCM_RI) | |
95 | sport->port.icount.rng++; | |
96 | if (changed & TIOCM_DSR) | |
97 | sport->port.icount.dsr++; | |
98 | if (changed & TIOCM_CAR) | |
99 | uart_handle_dcd_change(&sport->port, status & TIOCM_CAR); | |
100 | if (changed & TIOCM_CTS) | |
101 | uart_handle_cts_change(&sport->port, status & TIOCM_CTS); | |
102 | ||
103 | wake_up_interruptible(&sport->port.info->delta_msr_wait); | |
104 | } | |
105 | ||
106 | /* | |
107 | * This is our per-port timeout handler, for checking the | |
108 | * modem status signals. | |
109 | */ | |
110 | static void imx_timeout(unsigned long data) | |
111 | { | |
112 | struct imx_port *sport = (struct imx_port *)data; | |
113 | unsigned long flags; | |
114 | ||
115 | if (sport->port.info) { | |
116 | spin_lock_irqsave(&sport->port.lock, flags); | |
117 | imx_mctrl_check(sport); | |
118 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
119 | ||
120 | mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT); | |
121 | } | |
122 | } | |
123 | ||
124 | /* | |
125 | * interrupts disabled on entry | |
126 | */ | |
127 | static void imx_stop_tx(struct uart_port *port, unsigned int tty_stop) | |
128 | { | |
129 | struct imx_port *sport = (struct imx_port *)port; | |
130 | UCR1((u32)sport->port.membase) &= ~UCR1_TXMPTYEN; | |
131 | } | |
132 | ||
133 | /* | |
134 | * interrupts disabled on entry | |
135 | */ | |
136 | static void imx_stop_rx(struct uart_port *port) | |
137 | { | |
138 | struct imx_port *sport = (struct imx_port *)port; | |
139 | UCR2((u32)sport->port.membase) &= ~UCR2_RXEN; | |
140 | } | |
141 | ||
142 | /* | |
143 | * Set the modem control timer to fire immediately. | |
144 | */ | |
145 | static void imx_enable_ms(struct uart_port *port) | |
146 | { | |
147 | struct imx_port *sport = (struct imx_port *)port; | |
148 | ||
149 | mod_timer(&sport->timer, jiffies); | |
150 | } | |
151 | ||
152 | static inline void imx_transmit_buffer(struct imx_port *sport) | |
153 | { | |
154 | struct circ_buf *xmit = &sport->port.info->xmit; | |
155 | ||
156 | do { | |
157 | /* send xmit->buf[xmit->tail] | |
158 | * out the port here */ | |
159 | URTX0((u32)sport->port.membase) = xmit->buf[xmit->tail]; | |
160 | xmit->tail = (xmit->tail + 1) & | |
161 | (UART_XMIT_SIZE - 1); | |
162 | sport->port.icount.tx++; | |
163 | if (uart_circ_empty(xmit)) | |
164 | break; | |
165 | } while (!(UTS((u32)sport->port.membase) & UTS_TXFULL)); | |
166 | ||
167 | if (uart_circ_empty(xmit)) | |
168 | imx_stop_tx(&sport->port, 0); | |
169 | } | |
170 | ||
171 | /* | |
172 | * interrupts disabled on entry | |
173 | */ | |
174 | static void imx_start_tx(struct uart_port *port, unsigned int tty_start) | |
175 | { | |
176 | struct imx_port *sport = (struct imx_port *)port; | |
177 | ||
178 | UCR1((u32)sport->port.membase) |= UCR1_TXMPTYEN; | |
179 | ||
180 | if(UTS((u32)sport->port.membase) & UTS_TXEMPTY) | |
181 | imx_transmit_buffer(sport); | |
182 | } | |
183 | ||
184 | static irqreturn_t imx_txint(int irq, void *dev_id, struct pt_regs *regs) | |
185 | { | |
186 | struct imx_port *sport = (struct imx_port *)dev_id; | |
187 | struct circ_buf *xmit = &sport->port.info->xmit; | |
188 | unsigned long flags; | |
189 | ||
190 | spin_lock_irqsave(&sport->port.lock,flags); | |
191 | if (sport->port.x_char) | |
192 | { | |
193 | /* Send next char */ | |
194 | URTX0((u32)sport->port.membase) = sport->port.x_char; | |
195 | goto out; | |
196 | } | |
197 | ||
198 | if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) { | |
199 | imx_stop_tx(&sport->port, 0); | |
200 | goto out; | |
201 | } | |
202 | ||
203 | imx_transmit_buffer(sport); | |
204 | ||
205 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
206 | uart_write_wakeup(&sport->port); | |
207 | ||
208 | out: | |
209 | spin_unlock_irqrestore(&sport->port.lock,flags); | |
210 | return IRQ_HANDLED; | |
211 | } | |
212 | ||
213 | static irqreturn_t imx_rxint(int irq, void *dev_id, struct pt_regs *regs) | |
214 | { | |
215 | struct imx_port *sport = dev_id; | |
216 | unsigned int rx,flg,ignored = 0; | |
217 | struct tty_struct *tty = sport->port.info->tty; | |
218 | unsigned long flags; | |
219 | ||
220 | rx = URXD0((u32)sport->port.membase); | |
221 | spin_lock_irqsave(&sport->port.lock,flags); | |
222 | ||
223 | do { | |
224 | flg = TTY_NORMAL; | |
225 | sport->port.icount.rx++; | |
226 | ||
227 | if( USR2((u32)sport->port.membase) & USR2_BRCD ) { | |
228 | USR2((u32)sport->port.membase) |= USR2_BRCD; | |
229 | if(uart_handle_break(&sport->port)) | |
230 | goto ignore_char; | |
231 | } | |
232 | ||
233 | if (uart_handle_sysrq_char | |
234 | (&sport->port, (unsigned char)rx, regs)) | |
235 | goto ignore_char; | |
236 | ||
237 | if( rx & (URXD_PRERR | URXD_OVRRUN | URXD_FRMERR) ) | |
238 | goto handle_error; | |
239 | ||
240 | error_return: | |
241 | tty_insert_flip_char(tty, rx, flg); | |
242 | ||
243 | if (tty->flip.count >= TTY_FLIPBUF_SIZE) | |
244 | goto out; | |
245 | ||
246 | ignore_char: | |
247 | rx = URXD0((u32)sport->port.membase); | |
248 | } while(rx & URXD_CHARRDY); | |
249 | ||
250 | out: | |
251 | spin_unlock_irqrestore(&sport->port.lock,flags); | |
252 | tty_flip_buffer_push(tty); | |
253 | return IRQ_HANDLED; | |
254 | ||
255 | handle_error: | |
256 | if (rx & URXD_PRERR) | |
257 | sport->port.icount.parity++; | |
258 | else if (rx & URXD_FRMERR) | |
259 | sport->port.icount.frame++; | |
260 | if (rx & URXD_OVRRUN) | |
261 | sport->port.icount.overrun++; | |
262 | ||
263 | if (rx & sport->port.ignore_status_mask) { | |
264 | if (++ignored > 100) | |
265 | goto out; | |
266 | goto ignore_char; | |
267 | } | |
268 | ||
269 | rx &= sport->port.read_status_mask; | |
270 | ||
271 | if (rx & URXD_PRERR) | |
272 | flg = TTY_PARITY; | |
273 | else if (rx & URXD_FRMERR) | |
274 | flg = TTY_FRAME; | |
275 | if (rx & URXD_OVRRUN) | |
276 | flg = TTY_OVERRUN; | |
277 | ||
278 | #ifdef SUPPORT_SYSRQ | |
279 | sport->port.sysrq = 0; | |
280 | #endif | |
281 | goto error_return; | |
282 | } | |
283 | ||
284 | /* | |
285 | * Return TIOCSER_TEMT when transmitter is not busy. | |
286 | */ | |
287 | static unsigned int imx_tx_empty(struct uart_port *port) | |
288 | { | |
289 | struct imx_port *sport = (struct imx_port *)port; | |
290 | ||
291 | return USR2((u32)sport->port.membase) & USR2_TXDC ? TIOCSER_TEMT : 0; | |
292 | } | |
293 | ||
294 | static unsigned int imx_get_mctrl(struct uart_port *port) | |
295 | { | |
296 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; | |
297 | } | |
298 | ||
299 | static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
300 | { | |
301 | } | |
302 | ||
303 | /* | |
304 | * Interrupts always disabled. | |
305 | */ | |
306 | static void imx_break_ctl(struct uart_port *port, int break_state) | |
307 | { | |
308 | struct imx_port *sport = (struct imx_port *)port; | |
309 | unsigned long flags; | |
310 | ||
311 | spin_lock_irqsave(&sport->port.lock, flags); | |
312 | ||
313 | if ( break_state != 0 ) | |
314 | UCR1((u32)sport->port.membase) |= UCR1_SNDBRK; | |
315 | else | |
316 | UCR1((u32)sport->port.membase) &= ~UCR1_SNDBRK; | |
317 | ||
318 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
319 | } | |
320 | ||
321 | #define TXTL 2 /* reset default */ | |
322 | #define RXTL 1 /* reset default */ | |
323 | ||
587897f5 SH |
324 | static int imx_setup_ufcr(struct imx_port *sport, unsigned int mode) |
325 | { | |
326 | unsigned int val; | |
327 | unsigned int ufcr_rfdiv; | |
328 | ||
329 | /* set receiver / transmitter trigger level. | |
330 | * RFDIV is set such way to satisfy requested uartclk value | |
331 | */ | |
332 | val = TXTL<<10 | RXTL; | |
333 | ufcr_rfdiv = (imx_get_perclk1() + sport->port.uartclk / 2) / sport->port.uartclk; | |
334 | ||
335 | if(!ufcr_rfdiv) | |
336 | ufcr_rfdiv = 1; | |
337 | ||
338 | if(ufcr_rfdiv >= 7) | |
339 | ufcr_rfdiv = 6; | |
340 | else | |
341 | ufcr_rfdiv = 6 - ufcr_rfdiv; | |
342 | ||
343 | val |= UFCR_RFDIV & (ufcr_rfdiv << 7); | |
344 | ||
345 | UFCR((u32)sport->port.membase) = val; | |
346 | ||
347 | return 0; | |
348 | } | |
349 | ||
1da177e4 LT |
350 | static int imx_startup(struct uart_port *port) |
351 | { | |
352 | struct imx_port *sport = (struct imx_port *)port; | |
353 | int retval; | |
1da177e4 LT |
354 | unsigned long flags; |
355 | ||
587897f5 | 356 | imx_setup_ufcr(sport, 0); |
1da177e4 LT |
357 | |
358 | /* disable the DREN bit (Data Ready interrupt enable) before | |
359 | * requesting IRQs | |
360 | */ | |
361 | UCR4((u32)sport->port.membase) &= ~UCR4_DREN; | |
362 | ||
363 | /* | |
364 | * Allocate the IRQ | |
365 | */ | |
366 | retval = request_irq(sport->rxirq, imx_rxint, 0, | |
367 | DRIVER_NAME, sport); | |
368 | if (retval) goto error_out2; | |
369 | ||
370 | retval = request_irq(sport->txirq, imx_txint, 0, | |
371 | "imx-uart", sport); | |
372 | if (retval) goto error_out1; | |
373 | ||
374 | /* | |
375 | * Finally, clear and enable interrupts | |
376 | */ | |
377 | ||
378 | UCR1((u32)sport->port.membase) |= | |
379 | (UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_UARTEN); | |
380 | ||
381 | UCR2((u32)sport->port.membase) |= (UCR2_RXEN | UCR2_TXEN); | |
382 | /* | |
383 | * Enable modem status interrupts | |
384 | */ | |
385 | spin_lock_irqsave(&sport->port.lock,flags); | |
386 | imx_enable_ms(&sport->port); | |
387 | spin_unlock_irqrestore(&sport->port.lock,flags); | |
388 | ||
389 | return 0; | |
390 | ||
391 | error_out1: | |
392 | free_irq(sport->rxirq, sport); | |
393 | error_out2: | |
394 | free_irq(sport->txirq, sport); | |
395 | return retval; | |
396 | } | |
397 | ||
398 | static void imx_shutdown(struct uart_port *port) | |
399 | { | |
400 | struct imx_port *sport = (struct imx_port *)port; | |
401 | ||
402 | /* | |
403 | * Stop our timer. | |
404 | */ | |
405 | del_timer_sync(&sport->timer); | |
406 | ||
407 | /* | |
408 | * Free the interrupts | |
409 | */ | |
410 | free_irq(sport->txirq, sport); | |
411 | free_irq(sport->rxirq, sport); | |
412 | ||
413 | /* | |
414 | * Disable all interrupts, port and break condition. | |
415 | */ | |
416 | ||
417 | UCR1((u32)sport->port.membase) &= | |
418 | ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_UARTEN); | |
419 | } | |
420 | ||
421 | static void | |
422 | imx_set_termios(struct uart_port *port, struct termios *termios, | |
423 | struct termios *old) | |
424 | { | |
425 | struct imx_port *sport = (struct imx_port *)port; | |
426 | unsigned long flags; | |
427 | unsigned int ucr2, old_ucr1, old_txrxen, baud, quot; | |
428 | unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8; | |
429 | ||
430 | /* | |
431 | * If we don't support modem control lines, don't allow | |
432 | * these to be set. | |
433 | */ | |
434 | if (0) { | |
435 | termios->c_cflag &= ~(HUPCL | CRTSCTS | CMSPAR); | |
436 | termios->c_cflag |= CLOCAL; | |
437 | } | |
438 | ||
439 | /* | |
440 | * We only support CS7 and CS8. | |
441 | */ | |
442 | while ((termios->c_cflag & CSIZE) != CS7 && | |
443 | (termios->c_cflag & CSIZE) != CS8) { | |
444 | termios->c_cflag &= ~CSIZE; | |
445 | termios->c_cflag |= old_csize; | |
446 | old_csize = CS8; | |
447 | } | |
448 | ||
449 | if ((termios->c_cflag & CSIZE) == CS8) | |
450 | ucr2 = UCR2_WS | UCR2_SRST | UCR2_IRTS; | |
451 | else | |
452 | ucr2 = UCR2_SRST | UCR2_IRTS; | |
453 | ||
454 | if (termios->c_cflag & CRTSCTS) { | |
455 | ucr2 &= ~UCR2_IRTS; | |
456 | ucr2 |= UCR2_CTSC; | |
457 | } | |
458 | ||
459 | if (termios->c_cflag & CSTOPB) | |
460 | ucr2 |= UCR2_STPB; | |
461 | if (termios->c_cflag & PARENB) { | |
462 | ucr2 |= UCR2_PREN; | |
463 | if (!(termios->c_cflag & PARODD)) | |
464 | ucr2 |= UCR2_PROE; | |
465 | } | |
466 | ||
467 | /* | |
468 | * Ask the core to calculate the divisor for us. | |
469 | */ | |
470 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); | |
471 | quot = uart_get_divisor(port, baud); | |
472 | ||
473 | spin_lock_irqsave(&sport->port.lock, flags); | |
474 | ||
475 | sport->port.read_status_mask = 0; | |
476 | if (termios->c_iflag & INPCK) | |
477 | sport->port.read_status_mask |= (URXD_FRMERR | URXD_PRERR); | |
478 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
479 | sport->port.read_status_mask |= URXD_BRK; | |
480 | ||
481 | /* | |
482 | * Characters to ignore | |
483 | */ | |
484 | sport->port.ignore_status_mask = 0; | |
485 | if (termios->c_iflag & IGNPAR) | |
486 | sport->port.ignore_status_mask |= URXD_PRERR; | |
487 | if (termios->c_iflag & IGNBRK) { | |
488 | sport->port.ignore_status_mask |= URXD_BRK; | |
489 | /* | |
490 | * If we're ignoring parity and break indicators, | |
491 | * ignore overruns too (for real raw support). | |
492 | */ | |
493 | if (termios->c_iflag & IGNPAR) | |
494 | sport->port.ignore_status_mask |= URXD_OVRRUN; | |
495 | } | |
496 | ||
497 | del_timer_sync(&sport->timer); | |
498 | ||
499 | /* | |
500 | * Update the per-port timeout. | |
501 | */ | |
502 | uart_update_timeout(port, termios->c_cflag, baud); | |
503 | ||
504 | /* | |
505 | * disable interrupts and drain transmitter | |
506 | */ | |
507 | old_ucr1 = UCR1((u32)sport->port.membase); | |
508 | UCR1((u32)sport->port.membase) &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN); | |
509 | ||
510 | while ( !(USR2((u32)sport->port.membase) & USR2_TXDC)) | |
511 | barrier(); | |
512 | ||
513 | /* then, disable everything */ | |
514 | old_txrxen = UCR2((u32)sport->port.membase) & ( UCR2_TXEN | UCR2_RXEN ); | |
515 | UCR2((u32)sport->port.membase) &= ~( UCR2_TXEN | UCR2_RXEN); | |
516 | ||
517 | /* set the parity, stop bits and data size */ | |
518 | UCR2((u32)sport->port.membase) = ucr2; | |
519 | ||
520 | /* set the baud rate. We assume uartclk = 16 MHz | |
521 | * | |
522 | * baud * 16 UBIR - 1 | |
523 | * --------- = -------- | |
524 | * uartclk UBMR - 1 | |
525 | */ | |
526 | UBIR((u32)sport->port.membase) = (baud / 100) - 1; | |
527 | UBMR((u32)sport->port.membase) = 10000 - 1; | |
528 | ||
529 | UCR1((u32)sport->port.membase) = old_ucr1; | |
530 | UCR2((u32)sport->port.membase) |= old_txrxen; | |
531 | ||
532 | if (UART_ENABLE_MS(&sport->port, termios->c_cflag)) | |
533 | imx_enable_ms(&sport->port); | |
534 | ||
535 | spin_unlock_irqrestore(&sport->port.lock, flags); | |
536 | } | |
537 | ||
538 | static const char *imx_type(struct uart_port *port) | |
539 | { | |
540 | struct imx_port *sport = (struct imx_port *)port; | |
541 | ||
542 | return sport->port.type == PORT_IMX ? "IMX" : NULL; | |
543 | } | |
544 | ||
545 | /* | |
546 | * Release the memory region(s) being used by 'port'. | |
547 | */ | |
548 | static void imx_release_port(struct uart_port *port) | |
549 | { | |
550 | struct imx_port *sport = (struct imx_port *)port; | |
551 | ||
552 | release_mem_region(sport->port.mapbase, UART_PORT_SIZE); | |
553 | } | |
554 | ||
555 | /* | |
556 | * Request the memory region(s) being used by 'port'. | |
557 | */ | |
558 | static int imx_request_port(struct uart_port *port) | |
559 | { | |
560 | struct imx_port *sport = (struct imx_port *)port; | |
561 | ||
562 | return request_mem_region(sport->port.mapbase, UART_PORT_SIZE, | |
563 | "imx-uart") != NULL ? 0 : -EBUSY; | |
564 | } | |
565 | ||
566 | /* | |
567 | * Configure/autoconfigure the port. | |
568 | */ | |
569 | static void imx_config_port(struct uart_port *port, int flags) | |
570 | { | |
571 | struct imx_port *sport = (struct imx_port *)port; | |
572 | ||
573 | if (flags & UART_CONFIG_TYPE && | |
574 | imx_request_port(&sport->port) == 0) | |
575 | sport->port.type = PORT_IMX; | |
576 | } | |
577 | ||
578 | /* | |
579 | * Verify the new serial_struct (for TIOCSSERIAL). | |
580 | * The only change we allow are to the flags and type, and | |
581 | * even then only between PORT_IMX and PORT_UNKNOWN | |
582 | */ | |
583 | static int | |
584 | imx_verify_port(struct uart_port *port, struct serial_struct *ser) | |
585 | { | |
586 | struct imx_port *sport = (struct imx_port *)port; | |
587 | int ret = 0; | |
588 | ||
589 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_IMX) | |
590 | ret = -EINVAL; | |
591 | if (sport->port.irq != ser->irq) | |
592 | ret = -EINVAL; | |
593 | if (ser->io_type != UPIO_MEM) | |
594 | ret = -EINVAL; | |
595 | if (sport->port.uartclk / 16 != ser->baud_base) | |
596 | ret = -EINVAL; | |
597 | if ((void *)sport->port.mapbase != ser->iomem_base) | |
598 | ret = -EINVAL; | |
599 | if (sport->port.iobase != ser->port) | |
600 | ret = -EINVAL; | |
601 | if (ser->hub6 != 0) | |
602 | ret = -EINVAL; | |
603 | return ret; | |
604 | } | |
605 | ||
606 | static struct uart_ops imx_pops = { | |
607 | .tx_empty = imx_tx_empty, | |
608 | .set_mctrl = imx_set_mctrl, | |
609 | .get_mctrl = imx_get_mctrl, | |
610 | .stop_tx = imx_stop_tx, | |
611 | .start_tx = imx_start_tx, | |
612 | .stop_rx = imx_stop_rx, | |
613 | .enable_ms = imx_enable_ms, | |
614 | .break_ctl = imx_break_ctl, | |
615 | .startup = imx_startup, | |
616 | .shutdown = imx_shutdown, | |
617 | .set_termios = imx_set_termios, | |
618 | .type = imx_type, | |
619 | .release_port = imx_release_port, | |
620 | .request_port = imx_request_port, | |
621 | .config_port = imx_config_port, | |
622 | .verify_port = imx_verify_port, | |
623 | }; | |
624 | ||
625 | static struct imx_port imx_ports[] = { | |
626 | { | |
627 | .txirq = UART1_MINT_TX, | |
628 | .rxirq = UART1_MINT_RX, | |
629 | .port = { | |
630 | .type = PORT_IMX, | |
631 | .iotype = SERIAL_IO_MEM, | |
632 | .membase = (void *)IMX_UART1_BASE, | |
633 | .mapbase = IMX_UART1_BASE, /* FIXME */ | |
634 | .irq = UART1_MINT_RX, | |
635 | .uartclk = 16000000, | |
636 | .fifosize = 8, | |
637 | .flags = ASYNC_BOOT_AUTOCONF, | |
638 | .ops = &imx_pops, | |
639 | .line = 0, | |
640 | }, | |
641 | }, { | |
642 | .txirq = UART2_MINT_TX, | |
643 | .rxirq = UART2_MINT_RX, | |
644 | .port = { | |
645 | .type = PORT_IMX, | |
646 | .iotype = SERIAL_IO_MEM, | |
647 | .membase = (void *)IMX_UART2_BASE, | |
648 | .mapbase = IMX_UART2_BASE, /* FIXME */ | |
649 | .irq = UART2_MINT_RX, | |
650 | .uartclk = 16000000, | |
651 | .fifosize = 8, | |
652 | .flags = ASYNC_BOOT_AUTOCONF, | |
653 | .ops = &imx_pops, | |
654 | .line = 1, | |
655 | }, | |
656 | } | |
657 | }; | |
658 | ||
659 | /* | |
660 | * Setup the IMX serial ports. | |
661 | * Note also that we support "console=ttySMXx" where "x" is either 0 or 1. | |
662 | * Which serial port this ends up being depends on the machine you're | |
663 | * running this kernel on. I'm not convinced that this is a good idea, | |
664 | * but that's the way it traditionally works. | |
665 | * | |
666 | */ | |
667 | static void __init imx_init_ports(void) | |
668 | { | |
669 | static int first = 1; | |
670 | int i; | |
671 | ||
672 | if (!first) | |
673 | return; | |
674 | first = 0; | |
675 | ||
676 | for (i = 0; i < ARRAY_SIZE(imx_ports); i++) { | |
677 | init_timer(&imx_ports[i].timer); | |
678 | imx_ports[i].timer.function = imx_timeout; | |
679 | imx_ports[i].timer.data = (unsigned long)&imx_ports[i]; | |
680 | } | |
681 | ||
682 | imx_gpio_mode(PC9_PF_UART1_CTS); | |
683 | imx_gpio_mode(PC10_PF_UART1_RTS); | |
684 | imx_gpio_mode(PC11_PF_UART1_TXD); | |
685 | imx_gpio_mode(PC12_PF_UART1_RXD); | |
686 | imx_gpio_mode(PB28_PF_UART2_CTS); | |
687 | imx_gpio_mode(PB29_PF_UART2_RTS); | |
688 | ||
689 | imx_gpio_mode(PB30_PF_UART2_TXD); | |
690 | imx_gpio_mode(PB31_PF_UART2_RXD); | |
691 | ||
692 | #if 0 /* We don't need these, on the mx1 the _modem_ side of the uart | |
693 | * is implemented. | |
694 | */ | |
695 | imx_gpio_mode(PD7_AF_UART2_DTR); | |
696 | imx_gpio_mode(PD8_AF_UART2_DCD); | |
697 | imx_gpio_mode(PD9_AF_UART2_RI); | |
698 | imx_gpio_mode(PD10_AF_UART2_DSR); | |
699 | #endif | |
700 | ||
701 | ||
702 | } | |
703 | ||
704 | #ifdef CONFIG_SERIAL_IMX_CONSOLE | |
705 | ||
706 | /* | |
707 | * Interrupts are disabled on entering | |
708 | */ | |
709 | static void | |
710 | imx_console_write(struct console *co, const char *s, unsigned int count) | |
711 | { | |
712 | struct imx_port *sport = &imx_ports[co->index]; | |
713 | unsigned int old_ucr1, old_ucr2, i; | |
714 | ||
715 | /* | |
716 | * First, save UCR1/2 and then disable interrupts | |
717 | */ | |
718 | old_ucr1 = UCR1((u32)sport->port.membase); | |
719 | old_ucr2 = UCR2((u32)sport->port.membase); | |
720 | ||
721 | UCR1((u32)sport->port.membase) = | |
722 | (old_ucr1 | UCR1_UARTCLKEN | UCR1_UARTEN) | |
723 | & ~(UCR1_TXMPTYEN | UCR1_RRDYEN); | |
724 | UCR2((u32)sport->port.membase) = old_ucr2 | UCR2_TXEN; | |
725 | ||
726 | /* | |
727 | * Now, do each character | |
728 | */ | |
729 | for (i = 0; i < count; i++) { | |
730 | ||
731 | while ((UTS((u32)sport->port.membase) & UTS_TXFULL)) | |
732 | barrier(); | |
733 | ||
734 | URTX0((u32)sport->port.membase) = s[i]; | |
735 | ||
736 | if (s[i] == '\n') { | |
737 | while ((UTS((u32)sport->port.membase) & UTS_TXFULL)) | |
738 | barrier(); | |
739 | URTX0((u32)sport->port.membase) = '\r'; | |
740 | } | |
741 | } | |
742 | ||
743 | /* | |
744 | * Finally, wait for transmitter to become empty | |
745 | * and restore UCR1/2 | |
746 | */ | |
747 | while (!(USR2((u32)sport->port.membase) & USR2_TXDC)); | |
748 | ||
749 | UCR1((u32)sport->port.membase) = old_ucr1; | |
750 | UCR2((u32)sport->port.membase) = old_ucr2; | |
751 | } | |
752 | ||
753 | /* | |
754 | * If the port was already initialised (eg, by a boot loader), | |
755 | * try to determine the current setup. | |
756 | */ | |
757 | static void __init | |
758 | imx_console_get_options(struct imx_port *sport, int *baud, | |
759 | int *parity, int *bits) | |
760 | { | |
587897f5 | 761 | |
1da177e4 LT |
762 | if ( UCR1((u32)sport->port.membase) | UCR1_UARTEN ) { |
763 | /* ok, the port was enabled */ | |
764 | unsigned int ucr2, ubir,ubmr, uartclk; | |
587897f5 SH |
765 | unsigned int baud_raw; |
766 | unsigned int ucfr_rfdiv; | |
1da177e4 LT |
767 | |
768 | ucr2 = UCR2((u32)sport->port.membase); | |
769 | ||
770 | *parity = 'n'; | |
771 | if (ucr2 & UCR2_PREN) { | |
772 | if (ucr2 & UCR2_PROE) | |
773 | *parity = 'o'; | |
774 | else | |
775 | *parity = 'e'; | |
776 | } | |
777 | ||
778 | if (ucr2 & UCR2_WS) | |
779 | *bits = 8; | |
780 | else | |
781 | *bits = 7; | |
782 | ||
783 | ubir = UBIR((u32)sport->port.membase) & 0xffff; | |
784 | ubmr = UBMR((u32)sport->port.membase) & 0xffff; | |
1da177e4 | 785 | |
587897f5 SH |
786 | |
787 | ucfr_rfdiv = (UFCR((u32)sport->port.membase) & UFCR_RFDIV) >> 7; | |
788 | if (ucfr_rfdiv == 6) | |
789 | ucfr_rfdiv = 7; | |
790 | else | |
791 | ucfr_rfdiv = 6 - ucfr_rfdiv; | |
792 | ||
793 | uartclk = imx_get_perclk1(); | |
794 | uartclk /= ucfr_rfdiv; | |
795 | ||
796 | { /* | |
797 | * The next code provides exact computation of | |
798 | * baud_raw = round(((uartclk/16) * (ubir + 1)) / (ubmr + 1)) | |
799 | * without need of float support or long long division, | |
800 | * which would be required to prevent 32bit arithmetic overflow | |
801 | */ | |
802 | unsigned int mul = ubir + 1; | |
803 | unsigned int div = 16 * (ubmr + 1); | |
804 | unsigned int rem = uartclk % div; | |
805 | ||
806 | baud_raw = (uartclk / div) * mul; | |
807 | baud_raw += (rem * mul + div / 2) / div; | |
808 | *baud = (baud_raw + 50) / 100 * 100; | |
809 | } | |
810 | ||
811 | if(*baud != baud_raw) | |
812 | printk(KERN_INFO "Serial: Console IMX rounded baud rate from %d to %d\n", | |
813 | baud_raw, *baud); | |
1da177e4 LT |
814 | } |
815 | } | |
816 | ||
817 | static int __init | |
818 | imx_console_setup(struct console *co, char *options) | |
819 | { | |
820 | struct imx_port *sport; | |
821 | int baud = 9600; | |
822 | int bits = 8; | |
823 | int parity = 'n'; | |
824 | int flow = 'n'; | |
825 | ||
826 | /* | |
827 | * Check whether an invalid uart number has been specified, and | |
828 | * if so, search for the first available port that does have | |
829 | * console support. | |
830 | */ | |
831 | if (co->index == -1 || co->index >= ARRAY_SIZE(imx_ports)) | |
832 | co->index = 0; | |
833 | sport = &imx_ports[co->index]; | |
834 | ||
835 | if (options) | |
836 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
837 | else | |
838 | imx_console_get_options(sport, &baud, &parity, &bits); | |
839 | ||
587897f5 SH |
840 | imx_setup_ufcr(sport, 0); |
841 | ||
1da177e4 LT |
842 | return uart_set_options(&sport->port, co, baud, parity, bits, flow); |
843 | } | |
844 | ||
845 | extern struct uart_driver imx_reg; | |
846 | static struct console imx_console = { | |
847 | .name = "ttySMX", | |
848 | .write = imx_console_write, | |
849 | .device = uart_console_device, | |
850 | .setup = imx_console_setup, | |
851 | .flags = CON_PRINTBUFFER, | |
852 | .index = -1, | |
853 | .data = &imx_reg, | |
854 | }; | |
855 | ||
856 | static int __init imx_rs_console_init(void) | |
857 | { | |
858 | imx_init_ports(); | |
859 | register_console(&imx_console); | |
860 | return 0; | |
861 | } | |
862 | console_initcall(imx_rs_console_init); | |
863 | ||
864 | #define IMX_CONSOLE &imx_console | |
865 | #else | |
866 | #define IMX_CONSOLE NULL | |
867 | #endif | |
868 | ||
869 | static struct uart_driver imx_reg = { | |
870 | .owner = THIS_MODULE, | |
871 | .driver_name = DRIVER_NAME, | |
872 | .dev_name = "ttySMX", | |
873 | .devfs_name = "ttsmx/", | |
874 | .major = SERIAL_IMX_MAJOR, | |
875 | .minor = MINOR_START, | |
876 | .nr = ARRAY_SIZE(imx_ports), | |
877 | .cons = IMX_CONSOLE, | |
878 | }; | |
879 | ||
0370affe | 880 | static int serial_imx_suspend(struct device *_dev, pm_message_t state, u32 level) |
1da177e4 LT |
881 | { |
882 | struct imx_port *sport = dev_get_drvdata(_dev); | |
883 | ||
884 | if (sport && level == SUSPEND_DISABLE) | |
885 | uart_suspend_port(&imx_reg, &sport->port); | |
886 | ||
887 | return 0; | |
888 | } | |
889 | ||
890 | static int serial_imx_resume(struct device *_dev, u32 level) | |
891 | { | |
892 | struct imx_port *sport = dev_get_drvdata(_dev); | |
893 | ||
894 | if (sport && level == RESUME_ENABLE) | |
895 | uart_resume_port(&imx_reg, &sport->port); | |
896 | ||
897 | return 0; | |
898 | } | |
899 | ||
900 | static int serial_imx_probe(struct device *_dev) | |
901 | { | |
902 | struct platform_device *dev = to_platform_device(_dev); | |
903 | ||
904 | imx_ports[dev->id].port.dev = _dev; | |
905 | uart_add_one_port(&imx_reg, &imx_ports[dev->id].port); | |
906 | dev_set_drvdata(_dev, &imx_ports[dev->id]); | |
907 | return 0; | |
908 | } | |
909 | ||
910 | static int serial_imx_remove(struct device *_dev) | |
911 | { | |
912 | struct imx_port *sport = dev_get_drvdata(_dev); | |
913 | ||
914 | dev_set_drvdata(_dev, NULL); | |
915 | ||
916 | if (sport) | |
917 | uart_remove_one_port(&imx_reg, &sport->port); | |
918 | ||
919 | return 0; | |
920 | } | |
921 | ||
922 | static struct device_driver serial_imx_driver = { | |
923 | .name = "imx-uart", | |
924 | .bus = &platform_bus_type, | |
925 | .probe = serial_imx_probe, | |
926 | .remove = serial_imx_remove, | |
927 | ||
928 | .suspend = serial_imx_suspend, | |
929 | .resume = serial_imx_resume, | |
930 | }; | |
931 | ||
932 | static int __init imx_serial_init(void) | |
933 | { | |
934 | int ret; | |
935 | ||
936 | printk(KERN_INFO "Serial: IMX driver\n"); | |
937 | ||
938 | imx_init_ports(); | |
939 | ||
940 | ret = uart_register_driver(&imx_reg); | |
941 | if (ret) | |
942 | return ret; | |
943 | ||
944 | ret = driver_register(&serial_imx_driver); | |
945 | if (ret != 0) | |
946 | uart_unregister_driver(&imx_reg); | |
947 | ||
948 | return 0; | |
949 | } | |
950 | ||
951 | static void __exit imx_serial_exit(void) | |
952 | { | |
953 | uart_unregister_driver(&imx_reg); | |
954 | } | |
955 | ||
956 | module_init(imx_serial_init); | |
957 | module_exit(imx_serial_exit); | |
958 | ||
959 | MODULE_AUTHOR("Sascha Hauer"); | |
960 | MODULE_DESCRIPTION("IMX generic serial port driver"); | |
961 | MODULE_LICENSE("GPL"); |