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Xilinx: ARM: adding xylon IP snippet dts file
[linux-2.6-xlnx.git] / drivers / tty / serial / pnx8xxx_uart.c
blob0aa75a97531c77622e2aff05988e3a04fe242d69
1 /*
2 * UART driver for PNX8XXX SoCs
3 *
4 * Author: Per Hallsmark per.hallsmark@mvista.com
5 * Ported to 2.6 kernel by EmbeddedAlley
6 * Reworked by Vitaly Wool <vitalywool@gmail.com>
7 *
8 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
9 * Copyright (C) 2000 Deep Blue Solutions Ltd.
10 *
11 * This file is licensed under the terms of the GNU General Public License
12 * version 2. This program is licensed "as is" without any warranty of
13 * any kind, whether express or implied.
14 *
15 */
16
17 #if defined(CONFIG_SERIAL_PNX8XXX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
18 #define SUPPORT_SYSRQ
19 #endif
20
21 #include <linux/module.h>
22 #include <linux/ioport.h>
23 #include <linux/init.h>
24 #include <linux/console.h>
25 #include <linux/sysrq.h>
26 #include <linux/device.h>
27 #include <linux/platform_device.h>
28 #include <linux/tty.h>
29 #include <linux/tty_flip.h>
30 #include <linux/serial_core.h>
31 #include <linux/serial.h>
32 #include <linux/serial_pnx8xxx.h>
33
34 #include <asm/io.h>
35 #include <asm/irq.h>
36
37 /* We'll be using StrongARM sa1100 serial port major/minor */
38 #define SERIAL_PNX8XXX_MAJOR 204
39 #define MINOR_START 5
40
41 #define NR_PORTS 2
42
43 #define PNX8XXX_ISR_PASS_LIMIT 256
44
45 /*
46 * Convert from ignore_status_mask or read_status_mask to FIFO
47 * and interrupt status bits
48 */
49 #define SM_TO_FIFO(x) ((x) >> 10)
50 #define SM_TO_ISTAT(x) ((x) & 0x000001ff)
51 #define FIFO_TO_SM(x) ((x) << 10)
52 #define ISTAT_TO_SM(x) ((x) & 0x000001ff)
53
54 /*
55 * This is the size of our serial port register set.
56 */
57 #define UART_PORT_SIZE 0x1000
58
59 /*
60 * This determines how often we check the modem status signals
61 * for any change. They generally aren't connected to an IRQ
62 * so we have to poll them. We also check immediately before
63 * filling the TX fifo incase CTS has been dropped.
64 */
65 #define MCTRL_TIMEOUT (250*HZ/1000)
66
67 extern struct pnx8xxx_port pnx8xxx_ports[];
68
69 static inline int serial_in(struct pnx8xxx_port *sport, int offset)
70 {
71 return (__raw_readl(sport->port.membase + offset));
72 }
73
74 static inline void serial_out(struct pnx8xxx_port *sport, int offset, int value)
75 {
76 __raw_writel(value, sport->port.membase + offset);
77 }
78
79 /*
80 * Handle any change of modem status signal since we were last called.
81 */
82 static void pnx8xxx_mctrl_check(struct pnx8xxx_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.state->port.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 pnx8xxx_timeout(unsigned long data)
111 {
112 struct pnx8xxx_port *sport = (struct pnx8xxx_port *)data;
113 unsigned long flags;
114
115 if (sport->port.state) {
116 spin_lock_irqsave(&sport->port.lock, flags);
117 pnx8xxx_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 pnx8xxx_stop_tx(struct uart_port *port)
128 {
129 struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
130 u32 ien;
131
132 /* Disable TX intr */
133 ien = serial_in(sport, PNX8XXX_IEN);
134 serial_out(sport, PNX8XXX_IEN, ien & ~PNX8XXX_UART_INT_ALLTX);
135
136 /* Clear all pending TX intr */
137 serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLTX);
138 }
139
140 /*
141 * interrupts may not be disabled on entry
142 */
143 static void pnx8xxx_start_tx(struct uart_port *port)
144 {
145 struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
146 u32 ien;
147
148 /* Clear all pending TX intr */
149 serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLTX);
150
151 /* Enable TX intr */
152 ien = serial_in(sport, PNX8XXX_IEN);
153 serial_out(sport, PNX8XXX_IEN, ien | PNX8XXX_UART_INT_ALLTX);
154 }
155
156 /*
157 * Interrupts enabled
158 */
159 static void pnx8xxx_stop_rx(struct uart_port *port)
160 {
161 struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
162 u32 ien;
163
164 /* Disable RX intr */
165 ien = serial_in(sport, PNX8XXX_IEN);
166 serial_out(sport, PNX8XXX_IEN, ien & ~PNX8XXX_UART_INT_ALLRX);
167
168 /* Clear all pending RX intr */
169 serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX);
170 }
171
172 /*
173 * Set the modem control timer to fire immediately.
174 */
175 static void pnx8xxx_enable_ms(struct uart_port *port)
176 {
177 struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
178
179 mod_timer(&sport->timer, jiffies);
180 }
181
182 static void pnx8xxx_rx_chars(struct pnx8xxx_port *sport)
183 {
184 struct tty_struct *tty = sport->port.state->port.tty;
185 unsigned int status, ch, flg;
186
187 status = FIFO_TO_SM(serial_in(sport, PNX8XXX_FIFO)) |
188 ISTAT_TO_SM(serial_in(sport, PNX8XXX_ISTAT));
189 while (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFIFO)) {
190 ch = serial_in(sport, PNX8XXX_FIFO) & 0xff;
191
192 sport->port.icount.rx++;
193
194 flg = TTY_NORMAL;
195
196 /*
197 * note that the error handling code is
198 * out of the main execution path
199 */
200 if (status & (FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE |
201 PNX8XXX_UART_FIFO_RXPAR |
202 PNX8XXX_UART_FIFO_RXBRK) |
203 ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN))) {
204 if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXBRK)) {
205 status &= ~(FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) |
206 FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR));
207 sport->port.icount.brk++;
208 if (uart_handle_break(&sport->port))
209 goto ignore_char;
210 } else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR))
211 sport->port.icount.parity++;
212 else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE))
213 sport->port.icount.frame++;
214 if (status & ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN))
215 sport->port.icount.overrun++;
216
217 status &= sport->port.read_status_mask;
218
219 if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR))
220 flg = TTY_PARITY;
221 else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE))
222 flg = TTY_FRAME;
223
224 #ifdef SUPPORT_SYSRQ
225 sport->port.sysrq = 0;
226 #endif
227 }
228
229 if (uart_handle_sysrq_char(&sport->port, ch))
230 goto ignore_char;
231
232 uart_insert_char(&sport->port, status,
233 ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN), ch, flg);
234
235 ignore_char:
236 serial_out(sport, PNX8XXX_LCR, serial_in(sport, PNX8XXX_LCR) |
237 PNX8XXX_UART_LCR_RX_NEXT);
238 status = FIFO_TO_SM(serial_in(sport, PNX8XXX_FIFO)) |
239 ISTAT_TO_SM(serial_in(sport, PNX8XXX_ISTAT));
240 }
241 tty_flip_buffer_push(tty);
242 }
243
244 static void pnx8xxx_tx_chars(struct pnx8xxx_port *sport)
245 {
246 struct circ_buf *xmit = &sport->port.state->xmit;
247
248 if (sport->port.x_char) {
249 serial_out(sport, PNX8XXX_FIFO, sport->port.x_char);
250 sport->port.icount.tx++;
251 sport->port.x_char = 0;
252 return;
253 }
254
255 /*
256 * Check the modem control lines before
257 * transmitting anything.
258 */
259 pnx8xxx_mctrl_check(sport);
260
261 if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
262 pnx8xxx_stop_tx(&sport->port);
263 return;
264 }
265
266 /*
267 * TX while bytes available
268 */
269 while (((serial_in(sport, PNX8XXX_FIFO) &
270 PNX8XXX_UART_FIFO_TXFIFO) >> 16) < 16) {
271 serial_out(sport, PNX8XXX_FIFO, xmit->buf[xmit->tail]);
272 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
273 sport->port.icount.tx++;
274 if (uart_circ_empty(xmit))
275 break;
276 }
277
278 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
279 uart_write_wakeup(&sport->port);
280
281 if (uart_circ_empty(xmit))
282 pnx8xxx_stop_tx(&sport->port);
283 }
284
285 static irqreturn_t pnx8xxx_int(int irq, void *dev_id)
286 {
287 struct pnx8xxx_port *sport = dev_id;
288 unsigned int status;
289
290 spin_lock(&sport->port.lock);
291 /* Get the interrupts */
292 status = serial_in(sport, PNX8XXX_ISTAT) & serial_in(sport, PNX8XXX_IEN);
293
294 /* Byte or break signal received */
295 if (status & (PNX8XXX_UART_INT_RX | PNX8XXX_UART_INT_BREAK))
296 pnx8xxx_rx_chars(sport);
297
298 /* TX holding register empty - transmit a byte */
299 if (status & PNX8XXX_UART_INT_TX)
300 pnx8xxx_tx_chars(sport);
301
302 /* Clear the ISTAT register */
303 serial_out(sport, PNX8XXX_ICLR, status);
304
305 spin_unlock(&sport->port.lock);
306 return IRQ_HANDLED;
307 }
308
309 /*
310 * Return TIOCSER_TEMT when transmitter is not busy.
311 */
312 static unsigned int pnx8xxx_tx_empty(struct uart_port *port)
313 {
314 struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
315
316 return serial_in(sport, PNX8XXX_FIFO) & PNX8XXX_UART_FIFO_TXFIFO_STA ? 0 : TIOCSER_TEMT;
317 }
318
319 static unsigned int pnx8xxx_get_mctrl(struct uart_port *port)
320 {
321 struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
322 unsigned int mctrl = TIOCM_DSR;
323 unsigned int msr;
324
325 /* REVISIT */
326
327 msr = serial_in(sport, PNX8XXX_MCR);
328
329 mctrl |= msr & PNX8XXX_UART_MCR_CTS ? TIOCM_CTS : 0;
330 mctrl |= msr & PNX8XXX_UART_MCR_DCD ? TIOCM_CAR : 0;
331
332 return mctrl;
333 }
334
335 static void pnx8xxx_set_mctrl(struct uart_port *port, unsigned int mctrl)
336 {
337 #if 0 /* FIXME */
338 struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
339 unsigned int msr;
340 #endif
341 }
342
343 /*
344 * Interrupts always disabled.
345 */
346 static void pnx8xxx_break_ctl(struct uart_port *port, int break_state)
347 {
348 struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
349 unsigned long flags;
350 unsigned int lcr;
351
352 spin_lock_irqsave(&sport->port.lock, flags);
353 lcr = serial_in(sport, PNX8XXX_LCR);
354 if (break_state == -1)
355 lcr |= PNX8XXX_UART_LCR_TXBREAK;
356 else
357 lcr &= ~PNX8XXX_UART_LCR_TXBREAK;
358 serial_out(sport, PNX8XXX_LCR, lcr);
359 spin_unlock_irqrestore(&sport->port.lock, flags);
360 }
361
362 static int pnx8xxx_startup(struct uart_port *port)
363 {
364 struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
365 int retval;
366
367 /*
368 * Allocate the IRQ
369 */
370 retval = request_irq(sport->port.irq, pnx8xxx_int, 0,
371 "pnx8xxx-uart", sport);
372 if (retval)
373 return retval;
374
375 /*
376 * Finally, clear and enable interrupts
377 */
378
379 serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX |
380 PNX8XXX_UART_INT_ALLTX);
381
382 serial_out(sport, PNX8XXX_IEN, serial_in(sport, PNX8XXX_IEN) |
383 PNX8XXX_UART_INT_ALLRX |
384 PNX8XXX_UART_INT_ALLTX);
385
386 /*
387 * Enable modem status interrupts
388 */
389 spin_lock_irq(&sport->port.lock);
390 pnx8xxx_enable_ms(&sport->port);
391 spin_unlock_irq(&sport->port.lock);
392
393 return 0;
394 }
395
396 static void pnx8xxx_shutdown(struct uart_port *port)
397 {
398 struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
399 int lcr;
400
401 /*
402 * Stop our timer.
403 */
404 del_timer_sync(&sport->timer);
405
406 /*
407 * Disable all interrupts
408 */
409 serial_out(sport, PNX8XXX_IEN, 0);
410
411 /*
412 * Reset the Tx and Rx FIFOS, disable the break condition
413 */
414 lcr = serial_in(sport, PNX8XXX_LCR);
415 lcr &= ~PNX8XXX_UART_LCR_TXBREAK;
416 lcr |= PNX8XXX_UART_LCR_TX_RST | PNX8XXX_UART_LCR_RX_RST;
417 serial_out(sport, PNX8XXX_LCR, lcr);
418
419 /*
420 * Clear all interrupts
421 */
422 serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX |
423 PNX8XXX_UART_INT_ALLTX);
424
425 /*
426 * Free the interrupt
427 */
428 free_irq(sport->port.irq, sport);
429 }
430
431 static void
432 pnx8xxx_set_termios(struct uart_port *port, struct ktermios *termios,
433 struct ktermios *old)
434 {
435 struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
436 unsigned long flags;
437 unsigned int lcr_fcr, old_ien, baud, quot;
438 unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
439
440 /*
441 * We only support CS7 and CS8.
442 */
443 while ((termios->c_cflag & CSIZE) != CS7 &&
444 (termios->c_cflag & CSIZE) != CS8) {
445 termios->c_cflag &= ~CSIZE;
446 termios->c_cflag |= old_csize;
447 old_csize = CS8;
448 }
449
450 if ((termios->c_cflag & CSIZE) == CS8)
451 lcr_fcr = PNX8XXX_UART_LCR_8BIT;
452 else
453 lcr_fcr = 0;
454
455 if (termios->c_cflag & CSTOPB)
456 lcr_fcr |= PNX8XXX_UART_LCR_2STOPB;
457 if (termios->c_cflag & PARENB) {
458 lcr_fcr |= PNX8XXX_UART_LCR_PAREN;
459 if (!(termios->c_cflag & PARODD))
460 lcr_fcr |= PNX8XXX_UART_LCR_PAREVN;
461 }
462
463 /*
464 * Ask the core to calculate the divisor for us.
465 */
466 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
467 quot = uart_get_divisor(port, baud);
468
469 spin_lock_irqsave(&sport->port.lock, flags);
470
471 sport->port.read_status_mask = ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN) |
472 ISTAT_TO_SM(PNX8XXX_UART_INT_EMPTY) |
473 ISTAT_TO_SM(PNX8XXX_UART_INT_RX);
474 if (termios->c_iflag & INPCK)
475 sport->port.read_status_mask |=
476 FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) |
477 FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR);
478 if (termios->c_iflag & (BRKINT | PARMRK))
479 sport->port.read_status_mask |=
480 ISTAT_TO_SM(PNX8XXX_UART_INT_BREAK);
481
482 /*
483 * Characters to ignore
484 */
485 sport->port.ignore_status_mask = 0;
486 if (termios->c_iflag & IGNPAR)
487 sport->port.ignore_status_mask |=
488 FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) |
489 FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR);
490 if (termios->c_iflag & IGNBRK) {
491 sport->port.ignore_status_mask |=
492 ISTAT_TO_SM(PNX8XXX_UART_INT_BREAK);
493 /*
494 * If we're ignoring parity and break indicators,
495 * ignore overruns too (for real raw support).
496 */
497 if (termios->c_iflag & IGNPAR)
498 sport->port.ignore_status_mask |=
499 ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN);
500 }
501
502 /*
503 * ignore all characters if CREAD is not set
504 */
505 if ((termios->c_cflag & CREAD) == 0)
506 sport->port.ignore_status_mask |=
507 ISTAT_TO_SM(PNX8XXX_UART_INT_RX);
508
509 del_timer_sync(&sport->timer);
510
511 /*
512 * Update the per-port timeout.
513 */
514 uart_update_timeout(port, termios->c_cflag, baud);
515
516 /*
517 * disable interrupts and drain transmitter
518 */
519 old_ien = serial_in(sport, PNX8XXX_IEN);
520 serial_out(sport, PNX8XXX_IEN, old_ien & ~(PNX8XXX_UART_INT_ALLTX |
521 PNX8XXX_UART_INT_ALLRX));
522
523 while (serial_in(sport, PNX8XXX_FIFO) & PNX8XXX_UART_FIFO_TXFIFO_STA)
524 barrier();
525
526 /* then, disable everything */
527 serial_out(sport, PNX8XXX_IEN, 0);
528
529 /* Reset the Rx and Tx FIFOs too */
530 lcr_fcr |= PNX8XXX_UART_LCR_TX_RST;
531 lcr_fcr |= PNX8XXX_UART_LCR_RX_RST;
532
533 /* set the parity, stop bits and data size */
534 serial_out(sport, PNX8XXX_LCR, lcr_fcr);
535
536 /* set the baud rate */
537 quot -= 1;
538 serial_out(sport, PNX8XXX_BAUD, quot);
539
540 serial_out(sport, PNX8XXX_ICLR, -1);
541
542 serial_out(sport, PNX8XXX_IEN, old_ien);
543
544 if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
545 pnx8xxx_enable_ms(&sport->port);
546
547 spin_unlock_irqrestore(&sport->port.lock, flags);
548 }
549
550 static const char *pnx8xxx_type(struct uart_port *port)
551 {
552 struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
553
554 return sport->port.type == PORT_PNX8XXX ? "PNX8XXX" : NULL;
555 }
556
557 /*
558 * Release the memory region(s) being used by 'port'.
559 */
560 static void pnx8xxx_release_port(struct uart_port *port)
561 {
562 struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
563
564 release_mem_region(sport->port.mapbase, UART_PORT_SIZE);
565 }
566
567 /*
568 * Request the memory region(s) being used by 'port'.
569 */
570 static int pnx8xxx_request_port(struct uart_port *port)
571 {
572 struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
573 return request_mem_region(sport->port.mapbase, UART_PORT_SIZE,
574 "pnx8xxx-uart") != NULL ? 0 : -EBUSY;
575 }
576
577 /*
578 * Configure/autoconfigure the port.
579 */
580 static void pnx8xxx_config_port(struct uart_port *port, int flags)
581 {
582 struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
583
584 if (flags & UART_CONFIG_TYPE &&
585 pnx8xxx_request_port(&sport->port) == 0)
586 sport->port.type = PORT_PNX8XXX;
587 }
588
589 /*
590 * Verify the new serial_struct (for TIOCSSERIAL).
591 * The only change we allow are to the flags and type, and
592 * even then only between PORT_PNX8XXX and PORT_UNKNOWN
593 */
594 static int
595 pnx8xxx_verify_port(struct uart_port *port, struct serial_struct *ser)
596 {
597 struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
598 int ret = 0;
599
600 if (ser->type != PORT_UNKNOWN && ser->type != PORT_PNX8XXX)
601 ret = -EINVAL;
602 if (sport->port.irq != ser->irq)
603 ret = -EINVAL;
604 if (ser->io_type != SERIAL_IO_MEM)
605 ret = -EINVAL;
606 if (sport->port.uartclk / 16 != ser->baud_base)
607 ret = -EINVAL;
608 if ((void *)sport->port.mapbase != ser->iomem_base)
609 ret = -EINVAL;
610 if (sport->port.iobase != ser->port)
611 ret = -EINVAL;
612 if (ser->hub6 != 0)
613 ret = -EINVAL;
614 return ret;
615 }
616
617 static struct uart_ops pnx8xxx_pops = {
618 .tx_empty = pnx8xxx_tx_empty,
619 .set_mctrl = pnx8xxx_set_mctrl,
620 .get_mctrl = pnx8xxx_get_mctrl,
621 .stop_tx = pnx8xxx_stop_tx,
622 .start_tx = pnx8xxx_start_tx,
623 .stop_rx = pnx8xxx_stop_rx,
624 .enable_ms = pnx8xxx_enable_ms,
625 .break_ctl = pnx8xxx_break_ctl,
626 .startup = pnx8xxx_startup,
627 .shutdown = pnx8xxx_shutdown,
628 .set_termios = pnx8xxx_set_termios,
629 .type = pnx8xxx_type,
630 .release_port = pnx8xxx_release_port,
631 .request_port = pnx8xxx_request_port,
632 .config_port = pnx8xxx_config_port,
633 .verify_port = pnx8xxx_verify_port,
634 };
635
636
637 /*
638 * Setup the PNX8XXX serial ports.
639 *
640 * Note also that we support "console=ttySx" where "x" is either 0 or 1.
641 */
642 static void __init pnx8xxx_init_ports(void)
643 {
644 static int first = 1;
645 int i;
646
647 if (!first)
648 return;
649 first = 0;
650
651 for (i = 0; i < NR_PORTS; i++) {
652 init_timer(&pnx8xxx_ports[i].timer);
653 pnx8xxx_ports[i].timer.function = pnx8xxx_timeout;
654 pnx8xxx_ports[i].timer.data = (unsigned long)&pnx8xxx_ports[i];
655 pnx8xxx_ports[i].port.ops = &pnx8xxx_pops;
656 }
657 }
658
659 #ifdef CONFIG_SERIAL_PNX8XXX_CONSOLE
660
661 static void pnx8xxx_console_putchar(struct uart_port *port, int ch)
662 {
663 struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
664 int status;
665
666 do {
667 /* Wait for UART_TX register to empty */
668 status = serial_in(sport, PNX8XXX_FIFO);
669 } while (status & PNX8XXX_UART_FIFO_TXFIFO);
670 serial_out(sport, PNX8XXX_FIFO, ch);
671 }
672
673 /*
674 * Interrupts are disabled on entering
675 */static void
676 pnx8xxx_console_write(struct console *co, const char *s, unsigned int count)
677 {
678 struct pnx8xxx_port *sport = &pnx8xxx_ports[co->index];
679 unsigned int old_ien, status;
680
681 /*
682 * First, save IEN and then disable interrupts
683 */
684 old_ien = serial_in(sport, PNX8XXX_IEN);
685 serial_out(sport, PNX8XXX_IEN, old_ien & ~(PNX8XXX_UART_INT_ALLTX |
686 PNX8XXX_UART_INT_ALLRX));
687
688 uart_console_write(&sport->port, s, count, pnx8xxx_console_putchar);
689
690 /*
691 * Finally, wait for transmitter to become empty
692 * and restore IEN
693 */
694 do {
695 /* Wait for UART_TX register to empty */
696 status = serial_in(sport, PNX8XXX_FIFO);
697 } while (status & PNX8XXX_UART_FIFO_TXFIFO);
698
699 /* Clear TX and EMPTY interrupt */
700 serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_TX |
701 PNX8XXX_UART_INT_EMPTY);
702
703 serial_out(sport, PNX8XXX_IEN, old_ien);
704 }
705
706 static int __init
707 pnx8xxx_console_setup(struct console *co, char *options)
708 {
709 struct pnx8xxx_port *sport;
710 int baud = 38400;
711 int bits = 8;
712 int parity = 'n';
713 int flow = 'n';
714
715 /*
716 * Check whether an invalid uart number has been specified, and
717 * if so, search for the first available port that does have
718 * console support.
719 */
720 if (co->index == -1 || co->index >= NR_PORTS)
721 co->index = 0;
722 sport = &pnx8xxx_ports[co->index];
723
724 if (options)
725 uart_parse_options(options, &baud, &parity, &bits, &flow);
726
727 return uart_set_options(&sport->port, co, baud, parity, bits, flow);
728 }
729
730 static struct uart_driver pnx8xxx_reg;
731 static struct console pnx8xxx_console = {
732 .name = "ttyS",
733 .write = pnx8xxx_console_write,
734 .device = uart_console_device,
735 .setup = pnx8xxx_console_setup,
736 .flags = CON_PRINTBUFFER,
737 .index = -1,
738 .data = &pnx8xxx_reg,
739 };
740
741 static int __init pnx8xxx_rs_console_init(void)
742 {
743 pnx8xxx_init_ports();
744 register_console(&pnx8xxx_console);
745 return 0;
746 }
747 console_initcall(pnx8xxx_rs_console_init);
748
749 #define PNX8XXX_CONSOLE &pnx8xxx_console
750 #else
751 #define PNX8XXX_CONSOLE NULL
752 #endif
753
754 static struct uart_driver pnx8xxx_reg = {
755 .owner = THIS_MODULE,
756 .driver_name = "ttyS",
757 .dev_name = "ttyS",
758 .major = SERIAL_PNX8XXX_MAJOR,
759 .minor = MINOR_START,
760 .nr = NR_PORTS,
761 .cons = PNX8XXX_CONSOLE,
762 };
763
764 static int pnx8xxx_serial_suspend(struct platform_device *pdev, pm_message_t state)
765 {
766 struct pnx8xxx_port *sport = platform_get_drvdata(pdev);
767
768 return uart_suspend_port(&pnx8xxx_reg, &sport->port);
769 }
770
771 static int pnx8xxx_serial_resume(struct platform_device *pdev)
772 {
773 struct pnx8xxx_port *sport = platform_get_drvdata(pdev);
774
775 return uart_resume_port(&pnx8xxx_reg, &sport->port);
776 }
777
778 static int pnx8xxx_serial_probe(struct platform_device *pdev)
779 {
780 struct resource *res = pdev->resource;
781 int i;
782
783 for (i = 0; i < pdev->num_resources; i++, res++) {
784 if (!(res->flags & IORESOURCE_MEM))
785 continue;
786
787 for (i = 0; i < NR_PORTS; i++) {
788 if (pnx8xxx_ports[i].port.mapbase != res->start)
789 continue;
790
791 pnx8xxx_ports[i].port.dev = &pdev->dev;
792 uart_add_one_port(&pnx8xxx_reg, &pnx8xxx_ports[i].port);
793 platform_set_drvdata(pdev, &pnx8xxx_ports[i]);
794 break;
795 }
796 }
797
798 return 0;
799 }
800
801 static int pnx8xxx_serial_remove(struct platform_device *pdev)
802 {
803 struct pnx8xxx_port *sport = platform_get_drvdata(pdev);
804
805 platform_set_drvdata(pdev, NULL);
806
807 if (sport)
808 uart_remove_one_port(&pnx8xxx_reg, &sport->port);
809
810 return 0;
811 }
812
813 static struct platform_driver pnx8xxx_serial_driver = {
814 .driver = {
815 .name = "pnx8xxx-uart",
816 .owner = THIS_MODULE,
817 },
818 .probe = pnx8xxx_serial_probe,
819 .remove = pnx8xxx_serial_remove,
820 .suspend = pnx8xxx_serial_suspend,
821 .resume = pnx8xxx_serial_resume,
822 };
823
824 static int __init pnx8xxx_serial_init(void)
825 {
826 int ret;
827
828 printk(KERN_INFO "Serial: PNX8XXX driver\n");
829
830 pnx8xxx_init_ports();
831
832 ret = uart_register_driver(&pnx8xxx_reg);
833 if (ret == 0) {
834 ret = platform_driver_register(&pnx8xxx_serial_driver);
835 if (ret)
836 uart_unregister_driver(&pnx8xxx_reg);
837 }
838 return ret;
839 }
840
841 static void __exit pnx8xxx_serial_exit(void)
842 {
843 platform_driver_unregister(&pnx8xxx_serial_driver);
844 uart_unregister_driver(&pnx8xxx_reg);
845 }
846
847 module_init(pnx8xxx_serial_init);
848 module_exit(pnx8xxx_serial_exit);
849
850 MODULE_AUTHOR("Embedded Alley Solutions, Inc.");
851 MODULE_DESCRIPTION("PNX8XXX SoCs serial port driver");
852 MODULE_LICENSE("GPL");
853 MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_PNX8XXX_MAJOR);
854 MODULE_ALIAS("platform:pnx8xxx-uart");