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net: Detect and ignore netif_stop_queue() calls before register_netdev()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / serial / pxa.c
blob1102a39b44f5497c4daf4512123ba49fbeb9cf54
1 /*
2 * linux/drivers/serial/pxa.c
3 *
4 * Based on drivers/serial/8250.c by Russell King.
5 *
6 * Author: Nicolas Pitre
7 * Created: Feb 20, 2003
8 * Copyright: (C) 2003 Monta Vista Software, Inc.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * Note 1: This driver is made separate from the already too overloaded
16 * 8250.c because it needs some kirks of its own and that'll make it
17 * easier to add DMA support.
18 *
19 * Note 2: I'm too sick of device allocation policies for serial ports.
20 * If someone else wants to request an "official" allocation of major/minor
21 * for this driver please be my guest. And don't forget that new hardware
22 * to come from Intel might have more than 3 or 4 of those UARTs. Let's
23 * hope for a better port registration and dynamic device allocation scheme
24 * with the serial core maintainer satisfaction to appear soon.
25 */
26
27
28 #if defined(CONFIG_SERIAL_PXA_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
29 #define SUPPORT_SYSRQ
30 #endif
31
32 #include <linux/module.h>
33 #include <linux/ioport.h>
34 #include <linux/init.h>
35 #include <linux/console.h>
36 #include <linux/sysrq.h>
37 #include <linux/serial_reg.h>
38 #include <linux/circ_buf.h>
39 #include <linux/delay.h>
40 #include <linux/interrupt.h>
41 #include <linux/platform_device.h>
42 #include <linux/tty.h>
43 #include <linux/tty_flip.h>
44 #include <linux/serial_core.h>
45 #include <linux/clk.h>
46 #include <linux/io.h>
47 #include <linux/slab.h>
48
49 struct uart_pxa_port {
50 struct uart_port port;
51 unsigned char ier;
52 unsigned char lcr;
53 unsigned char mcr;
54 unsigned int lsr_break_flag;
55 struct clk *clk;
56 char *name;
57 };
58
59 static inline unsigned int serial_in(struct uart_pxa_port *up, int offset)
60 {
61 offset <<= 2;
62 return readl(up->port.membase + offset);
63 }
64
65 static inline void serial_out(struct uart_pxa_port *up, int offset, int value)
66 {
67 offset <<= 2;
68 writel(value, up->port.membase + offset);
69 }
70
71 static void serial_pxa_enable_ms(struct uart_port *port)
72 {
73 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
74
75 up->ier |= UART_IER_MSI;
76 serial_out(up, UART_IER, up->ier);
77 }
78
79 static void serial_pxa_stop_tx(struct uart_port *port)
80 {
81 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
82
83 if (up->ier & UART_IER_THRI) {
84 up->ier &= ~UART_IER_THRI;
85 serial_out(up, UART_IER, up->ier);
86 }
87 }
88
89 static void serial_pxa_stop_rx(struct uart_port *port)
90 {
91 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
92
93 up->ier &= ~UART_IER_RLSI;
94 up->port.read_status_mask &= ~UART_LSR_DR;
95 serial_out(up, UART_IER, up->ier);
96 }
97
98 static inline void receive_chars(struct uart_pxa_port *up, int *status)
99 {
100 struct tty_struct *tty = up->port.state->port.tty;
101 unsigned int ch, flag;
102 int max_count = 256;
103
104 do {
105 ch = serial_in(up, UART_RX);
106 flag = TTY_NORMAL;
107 up->port.icount.rx++;
108
109 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
110 UART_LSR_FE | UART_LSR_OE))) {
111 /*
112 * For statistics only
113 */
114 if (*status & UART_LSR_BI) {
115 *status &= ~(UART_LSR_FE | UART_LSR_PE);
116 up->port.icount.brk++;
117 /*
118 * We do the SysRQ and SAK checking
119 * here because otherwise the break
120 * may get masked by ignore_status_mask
121 * or read_status_mask.
122 */
123 if (uart_handle_break(&up->port))
124 goto ignore_char;
125 } else if (*status & UART_LSR_PE)
126 up->port.icount.parity++;
127 else if (*status & UART_LSR_FE)
128 up->port.icount.frame++;
129 if (*status & UART_LSR_OE)
130 up->port.icount.overrun++;
131
132 /*
133 * Mask off conditions which should be ignored.
134 */
135 *status &= up->port.read_status_mask;
136
137 #ifdef CONFIG_SERIAL_PXA_CONSOLE
138 if (up->port.line == up->port.cons->index) {
139 /* Recover the break flag from console xmit */
140 *status |= up->lsr_break_flag;
141 up->lsr_break_flag = 0;
142 }
143 #endif
144 if (*status & UART_LSR_BI) {
145 flag = TTY_BREAK;
146 } else if (*status & UART_LSR_PE)
147 flag = TTY_PARITY;
148 else if (*status & UART_LSR_FE)
149 flag = TTY_FRAME;
150 }
151
152 if (uart_handle_sysrq_char(&up->port, ch))
153 goto ignore_char;
154
155 uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag);
156
157 ignore_char:
158 *status = serial_in(up, UART_LSR);
159 } while ((*status & UART_LSR_DR) && (max_count-- > 0));
160 tty_flip_buffer_push(tty);
161 }
162
163 static void transmit_chars(struct uart_pxa_port *up)
164 {
165 struct circ_buf *xmit = &up->port.state->xmit;
166 int count;
167
168 if (up->port.x_char) {
169 serial_out(up, UART_TX, up->port.x_char);
170 up->port.icount.tx++;
171 up->port.x_char = 0;
172 return;
173 }
174 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
175 serial_pxa_stop_tx(&up->port);
176 return;
177 }
178
179 count = up->port.fifosize / 2;
180 do {
181 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
182 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
183 up->port.icount.tx++;
184 if (uart_circ_empty(xmit))
185 break;
186 } while (--count > 0);
187
188 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
189 uart_write_wakeup(&up->port);
190
191
192 if (uart_circ_empty(xmit))
193 serial_pxa_stop_tx(&up->port);
194 }
195
196 static void serial_pxa_start_tx(struct uart_port *port)
197 {
198 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
199
200 if (!(up->ier & UART_IER_THRI)) {
201 up->ier |= UART_IER_THRI;
202 serial_out(up, UART_IER, up->ier);
203 }
204 }
205
206 static inline void check_modem_status(struct uart_pxa_port *up)
207 {
208 int status;
209
210 status = serial_in(up, UART_MSR);
211
212 if ((status & UART_MSR_ANY_DELTA) == 0)
213 return;
214
215 if (status & UART_MSR_TERI)
216 up->port.icount.rng++;
217 if (status & UART_MSR_DDSR)
218 up->port.icount.dsr++;
219 if (status & UART_MSR_DDCD)
220 uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
221 if (status & UART_MSR_DCTS)
222 uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
223
224 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
225 }
226
227 /*
228 * This handles the interrupt from one port.
229 */
230 static inline irqreturn_t serial_pxa_irq(int irq, void *dev_id)
231 {
232 struct uart_pxa_port *up = dev_id;
233 unsigned int iir, lsr;
234
235 iir = serial_in(up, UART_IIR);
236 if (iir & UART_IIR_NO_INT)
237 return IRQ_NONE;
238 lsr = serial_in(up, UART_LSR);
239 if (lsr & UART_LSR_DR)
240 receive_chars(up, &lsr);
241 check_modem_status(up);
242 if (lsr & UART_LSR_THRE)
243 transmit_chars(up);
244 return IRQ_HANDLED;
245 }
246
247 static unsigned int serial_pxa_tx_empty(struct uart_port *port)
248 {
249 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
250 unsigned long flags;
251 unsigned int ret;
252
253 spin_lock_irqsave(&up->port.lock, flags);
254 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
255 spin_unlock_irqrestore(&up->port.lock, flags);
256
257 return ret;
258 }
259
260 static unsigned int serial_pxa_get_mctrl(struct uart_port *port)
261 {
262 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
263 unsigned char status;
264 unsigned int ret;
265
266 status = serial_in(up, UART_MSR);
267
268 ret = 0;
269 if (status & UART_MSR_DCD)
270 ret |= TIOCM_CAR;
271 if (status & UART_MSR_RI)
272 ret |= TIOCM_RNG;
273 if (status & UART_MSR_DSR)
274 ret |= TIOCM_DSR;
275 if (status & UART_MSR_CTS)
276 ret |= TIOCM_CTS;
277 return ret;
278 }
279
280 static void serial_pxa_set_mctrl(struct uart_port *port, unsigned int mctrl)
281 {
282 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
283 unsigned char mcr = 0;
284
285 if (mctrl & TIOCM_RTS)
286 mcr |= UART_MCR_RTS;
287 if (mctrl & TIOCM_DTR)
288 mcr |= UART_MCR_DTR;
289 if (mctrl & TIOCM_OUT1)
290 mcr |= UART_MCR_OUT1;
291 if (mctrl & TIOCM_OUT2)
292 mcr |= UART_MCR_OUT2;
293 if (mctrl & TIOCM_LOOP)
294 mcr |= UART_MCR_LOOP;
295
296 mcr |= up->mcr;
297
298 serial_out(up, UART_MCR, mcr);
299 }
300
301 static void serial_pxa_break_ctl(struct uart_port *port, int break_state)
302 {
303 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
304 unsigned long flags;
305
306 spin_lock_irqsave(&up->port.lock, flags);
307 if (break_state == -1)
308 up->lcr |= UART_LCR_SBC;
309 else
310 up->lcr &= ~UART_LCR_SBC;
311 serial_out(up, UART_LCR, up->lcr);
312 spin_unlock_irqrestore(&up->port.lock, flags);
313 }
314
315 #if 0
316 static void serial_pxa_dma_init(struct pxa_uart *up)
317 {
318 up->rxdma =
319 pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_receive_dma, up);
320 if (up->rxdma < 0)
321 goto out;
322 up->txdma =
323 pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_transmit_dma, up);
324 if (up->txdma < 0)
325 goto err_txdma;
326 up->dmadesc = kmalloc(4 * sizeof(pxa_dma_desc), GFP_KERNEL);
327 if (!up->dmadesc)
328 goto err_alloc;
329
330 /* ... */
331 err_alloc:
332 pxa_free_dma(up->txdma);
333 err_rxdma:
334 pxa_free_dma(up->rxdma);
335 out:
336 return;
337 }
338 #endif
339
340 static int serial_pxa_startup(struct uart_port *port)
341 {
342 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
343 unsigned long flags;
344 int retval;
345
346 if (port->line == 3) /* HWUART */
347 up->mcr |= UART_MCR_AFE;
348 else
349 up->mcr = 0;
350
351 up->port.uartclk = clk_get_rate(up->clk);
352
353 /*
354 * Allocate the IRQ
355 */
356 retval = request_irq(up->port.irq, serial_pxa_irq, 0, up->name, up);
357 if (retval)
358 return retval;
359
360 /*
361 * Clear the FIFO buffers and disable them.
362 * (they will be reenabled in set_termios())
363 */
364 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
365 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
366 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
367 serial_out(up, UART_FCR, 0);
368
369 /*
370 * Clear the interrupt registers.
371 */
372 (void) serial_in(up, UART_LSR);
373 (void) serial_in(up, UART_RX);
374 (void) serial_in(up, UART_IIR);
375 (void) serial_in(up, UART_MSR);
376
377 /*
378 * Now, initialize the UART
379 */
380 serial_out(up, UART_LCR, UART_LCR_WLEN8);
381
382 spin_lock_irqsave(&up->port.lock, flags);
383 up->port.mctrl |= TIOCM_OUT2;
384 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
385 spin_unlock_irqrestore(&up->port.lock, flags);
386
387 /*
388 * Finally, enable interrupts. Note: Modem status interrupts
389 * are set via set_termios(), which will be occurring imminently
390 * anyway, so we don't enable them here.
391 */
392 up->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE;
393 serial_out(up, UART_IER, up->ier);
394
395 /*
396 * And clear the interrupt registers again for luck.
397 */
398 (void) serial_in(up, UART_LSR);
399 (void) serial_in(up, UART_RX);
400 (void) serial_in(up, UART_IIR);
401 (void) serial_in(up, UART_MSR);
402
403 return 0;
404 }
405
406 static void serial_pxa_shutdown(struct uart_port *port)
407 {
408 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
409 unsigned long flags;
410
411 free_irq(up->port.irq, up);
412
413 /*
414 * Disable interrupts from this port
415 */
416 up->ier = 0;
417 serial_out(up, UART_IER, 0);
418
419 spin_lock_irqsave(&up->port.lock, flags);
420 up->port.mctrl &= ~TIOCM_OUT2;
421 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
422 spin_unlock_irqrestore(&up->port.lock, flags);
423
424 /*
425 * Disable break condition and FIFOs
426 */
427 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
428 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
429 UART_FCR_CLEAR_RCVR |
430 UART_FCR_CLEAR_XMIT);
431 serial_out(up, UART_FCR, 0);
432 }
433
434 static void
435 serial_pxa_set_termios(struct uart_port *port, struct ktermios *termios,
436 struct ktermios *old)
437 {
438 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
439 unsigned char cval, fcr = 0;
440 unsigned long flags;
441 unsigned int baud, quot;
442 unsigned int dll;
443
444 switch (termios->c_cflag & CSIZE) {
445 case CS5:
446 cval = UART_LCR_WLEN5;
447 break;
448 case CS6:
449 cval = UART_LCR_WLEN6;
450 break;
451 case CS7:
452 cval = UART_LCR_WLEN7;
453 break;
454 default:
455 case CS8:
456 cval = UART_LCR_WLEN8;
457 break;
458 }
459
460 if (termios->c_cflag & CSTOPB)
461 cval |= UART_LCR_STOP;
462 if (termios->c_cflag & PARENB)
463 cval |= UART_LCR_PARITY;
464 if (!(termios->c_cflag & PARODD))
465 cval |= UART_LCR_EPAR;
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 if ((up->port.uartclk / quot) < (2400 * 16))
474 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR1;
475 else if ((up->port.uartclk / quot) < (230400 * 16))
476 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR8;
477 else
478 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR32;
479
480 /*
481 * Ok, we're now changing the port state. Do it with
482 * interrupts disabled.
483 */
484 spin_lock_irqsave(&up->port.lock, flags);
485
486 /*
487 * Ensure the port will be enabled.
488 * This is required especially for serial console.
489 */
490 up->ier |= UART_IER_UUE;
491
492 /*
493 * Update the per-port timeout.
494 */
495 uart_update_timeout(port, termios->c_cflag, baud);
496
497 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
498 if (termios->c_iflag & INPCK)
499 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
500 if (termios->c_iflag & (BRKINT | PARMRK))
501 up->port.read_status_mask |= UART_LSR_BI;
502
503 /*
504 * Characters to ignore
505 */
506 up->port.ignore_status_mask = 0;
507 if (termios->c_iflag & IGNPAR)
508 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
509 if (termios->c_iflag & IGNBRK) {
510 up->port.ignore_status_mask |= UART_LSR_BI;
511 /*
512 * If we're ignoring parity and break indicators,
513 * ignore overruns too (for real raw support).
514 */
515 if (termios->c_iflag & IGNPAR)
516 up->port.ignore_status_mask |= UART_LSR_OE;
517 }
518
519 /*
520 * ignore all characters if CREAD is not set
521 */
522 if ((termios->c_cflag & CREAD) == 0)
523 up->port.ignore_status_mask |= UART_LSR_DR;
524
525 /*
526 * CTS flow control flag and modem status interrupts
527 */
528 up->ier &= ~UART_IER_MSI;
529 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
530 up->ier |= UART_IER_MSI;
531
532 serial_out(up, UART_IER, up->ier);
533
534 if (termios->c_cflag & CRTSCTS)
535 up->mcr |= UART_MCR_AFE;
536 else
537 up->mcr &= ~UART_MCR_AFE;
538
539 serial_out(up, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */
540 serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */
541
542 /*
543 * work around Errata #75 according to Intel(R) PXA27x Processor Family
544 * Specification Update (Nov 2005)
545 */
546 dll = serial_in(up, UART_DLL);
547 WARN_ON(dll != (quot & 0xff));
548
549 serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */
550 serial_out(up, UART_LCR, cval); /* reset DLAB */
551 up->lcr = cval; /* Save LCR */
552 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
553 serial_out(up, UART_FCR, fcr);
554 spin_unlock_irqrestore(&up->port.lock, flags);
555 }
556
557 static void
558 serial_pxa_pm(struct uart_port *port, unsigned int state,
559 unsigned int oldstate)
560 {
561 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
562
563 if (!state)
564 clk_enable(up->clk);
565 else
566 clk_disable(up->clk);
567 }
568
569 static void serial_pxa_release_port(struct uart_port *port)
570 {
571 }
572
573 static int serial_pxa_request_port(struct uart_port *port)
574 {
575 return 0;
576 }
577
578 static void serial_pxa_config_port(struct uart_port *port, int flags)
579 {
580 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
581 up->port.type = PORT_PXA;
582 }
583
584 static int
585 serial_pxa_verify_port(struct uart_port *port, struct serial_struct *ser)
586 {
587 /* we don't want the core code to modify any port params */
588 return -EINVAL;
589 }
590
591 static const char *
592 serial_pxa_type(struct uart_port *port)
593 {
594 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
595 return up->name;
596 }
597
598 static struct uart_pxa_port *serial_pxa_ports[4];
599 static struct uart_driver serial_pxa_reg;
600
601 #ifdef CONFIG_SERIAL_PXA_CONSOLE
602
603 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
604
605 /*
606 * Wait for transmitter & holding register to empty
607 */
608 static inline void wait_for_xmitr(struct uart_pxa_port *up)
609 {
610 unsigned int status, tmout = 10000;
611
612 /* Wait up to 10ms for the character(s) to be sent. */
613 do {
614 status = serial_in(up, UART_LSR);
615
616 if (status & UART_LSR_BI)
617 up->lsr_break_flag = UART_LSR_BI;
618
619 if (--tmout == 0)
620 break;
621 udelay(1);
622 } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
623
624 /* Wait up to 1s for flow control if necessary */
625 if (up->port.flags & UPF_CONS_FLOW) {
626 tmout = 1000000;
627 while (--tmout &&
628 ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
629 udelay(1);
630 }
631 }
632
633 static void serial_pxa_console_putchar(struct uart_port *port, int ch)
634 {
635 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
636
637 wait_for_xmitr(up);
638 serial_out(up, UART_TX, ch);
639 }
640
641 /*
642 * Print a string to the serial port trying not to disturb
643 * any possible real use of the port...
644 *
645 * The console_lock must be held when we get here.
646 */
647 static void
648 serial_pxa_console_write(struct console *co, const char *s, unsigned int count)
649 {
650 struct uart_pxa_port *up = serial_pxa_ports[co->index];
651 unsigned int ier;
652
653 clk_enable(up->clk);
654
655 /*
656 * First save the IER then disable the interrupts
657 */
658 ier = serial_in(up, UART_IER);
659 serial_out(up, UART_IER, UART_IER_UUE);
660
661 uart_console_write(&up->port, s, count, serial_pxa_console_putchar);
662
663 /*
664 * Finally, wait for transmitter to become empty
665 * and restore the IER
666 */
667 wait_for_xmitr(up);
668 serial_out(up, UART_IER, ier);
669
670 clk_disable(up->clk);
671 }
672
673 static int __init
674 serial_pxa_console_setup(struct console *co, char *options)
675 {
676 struct uart_pxa_port *up;
677 int baud = 9600;
678 int bits = 8;
679 int parity = 'n';
680 int flow = 'n';
681
682 if (co->index == -1 || co->index >= serial_pxa_reg.nr)
683 co->index = 0;
684 up = serial_pxa_ports[co->index];
685 if (!up)
686 return -ENODEV;
687
688 if (options)
689 uart_parse_options(options, &baud, &parity, &bits, &flow);
690
691 return uart_set_options(&up->port, co, baud, parity, bits, flow);
692 }
693
694 static struct console serial_pxa_console = {
695 .name = "ttyS",
696 .write = serial_pxa_console_write,
697 .device = uart_console_device,
698 .setup = serial_pxa_console_setup,
699 .flags = CON_PRINTBUFFER,
700 .index = -1,
701 .data = &serial_pxa_reg,
702 };
703
704 #define PXA_CONSOLE &serial_pxa_console
705 #else
706 #define PXA_CONSOLE NULL
707 #endif
708
709 struct uart_ops serial_pxa_pops = {
710 .tx_empty = serial_pxa_tx_empty,
711 .set_mctrl = serial_pxa_set_mctrl,
712 .get_mctrl = serial_pxa_get_mctrl,
713 .stop_tx = serial_pxa_stop_tx,
714 .start_tx = serial_pxa_start_tx,
715 .stop_rx = serial_pxa_stop_rx,
716 .enable_ms = serial_pxa_enable_ms,
717 .break_ctl = serial_pxa_break_ctl,
718 .startup = serial_pxa_startup,
719 .shutdown = serial_pxa_shutdown,
720 .set_termios = serial_pxa_set_termios,
721 .pm = serial_pxa_pm,
722 .type = serial_pxa_type,
723 .release_port = serial_pxa_release_port,
724 .request_port = serial_pxa_request_port,
725 .config_port = serial_pxa_config_port,
726 .verify_port = serial_pxa_verify_port,
727 };
728
729 static struct uart_driver serial_pxa_reg = {
730 .owner = THIS_MODULE,
731 .driver_name = "PXA serial",
732 .dev_name = "ttyS",
733 .major = TTY_MAJOR,
734 .minor = 64,
735 .nr = 4,
736 .cons = PXA_CONSOLE,
737 };
738
739 #ifdef CONFIG_PM
740 static int serial_pxa_suspend(struct device *dev)
741 {
742 struct uart_pxa_port *sport = dev_get_drvdata(dev);
743
744 if (sport)
745 uart_suspend_port(&serial_pxa_reg, &sport->port);
746
747 return 0;
748 }
749
750 static int serial_pxa_resume(struct device *dev)
751 {
752 struct uart_pxa_port *sport = dev_get_drvdata(dev);
753
754 if (sport)
755 uart_resume_port(&serial_pxa_reg, &sport->port);
756
757 return 0;
758 }
759
760 static const struct dev_pm_ops serial_pxa_pm_ops = {
761 .suspend = serial_pxa_suspend,
762 .resume = serial_pxa_resume,
763 };
764 #endif
765
766 static int serial_pxa_probe(struct platform_device *dev)
767 {
768 struct uart_pxa_port *sport;
769 struct resource *mmres, *irqres;
770 int ret;
771
772 mmres = platform_get_resource(dev, IORESOURCE_MEM, 0);
773 irqres = platform_get_resource(dev, IORESOURCE_IRQ, 0);
774 if (!mmres || !irqres)
775 return -ENODEV;
776
777 sport = kzalloc(sizeof(struct uart_pxa_port), GFP_KERNEL);
778 if (!sport)
779 return -ENOMEM;
780
781 sport->clk = clk_get(&dev->dev, NULL);
782 if (IS_ERR(sport->clk)) {
783 ret = PTR_ERR(sport->clk);
784 goto err_free;
785 }
786
787 sport->port.type = PORT_PXA;
788 sport->port.iotype = UPIO_MEM;
789 sport->port.mapbase = mmres->start;
790 sport->port.irq = irqres->start;
791 sport->port.fifosize = 64;
792 sport->port.ops = &serial_pxa_pops;
793 sport->port.line = dev->id;
794 sport->port.dev = &dev->dev;
795 sport->port.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
796 sport->port.uartclk = clk_get_rate(sport->clk);
797
798 switch (dev->id) {
799 case 0: sport->name = "FFUART"; break;
800 case 1: sport->name = "BTUART"; break;
801 case 2: sport->name = "STUART"; break;
802 case 3: sport->name = "HWUART"; break;
803 default:
804 sport->name = "???";
805 break;
806 }
807
808 sport->port.membase = ioremap(mmres->start, mmres->end - mmres->start + 1);
809 if (!sport->port.membase) {
810 ret = -ENOMEM;
811 goto err_clk;
812 }
813
814 serial_pxa_ports[dev->id] = sport;
815
816 uart_add_one_port(&serial_pxa_reg, &sport->port);
817 platform_set_drvdata(dev, sport);
818
819 return 0;
820
821 err_clk:
822 clk_put(sport->clk);
823 err_free:
824 kfree(sport);
825 return ret;
826 }
827
828 static int serial_pxa_remove(struct platform_device *dev)
829 {
830 struct uart_pxa_port *sport = platform_get_drvdata(dev);
831
832 platform_set_drvdata(dev, NULL);
833
834 uart_remove_one_port(&serial_pxa_reg, &sport->port);
835 clk_put(sport->clk);
836 kfree(sport);
837
838 return 0;
839 }
840
841 static struct platform_driver serial_pxa_driver = {
842 .probe = serial_pxa_probe,
843 .remove = serial_pxa_remove,
844
845 .driver = {
846 .name = "pxa2xx-uart",
847 .owner = THIS_MODULE,
848 #ifdef CONFIG_PM
849 .pm = &serial_pxa_pm_ops,
850 #endif
851 },
852 };
853
854 int __init serial_pxa_init(void)
855 {
856 int ret;
857
858 ret = uart_register_driver(&serial_pxa_reg);
859 if (ret != 0)
860 return ret;
861
862 ret = platform_driver_register(&serial_pxa_driver);
863 if (ret != 0)
864 uart_unregister_driver(&serial_pxa_reg);
865
866 return ret;
867 }
868
869 void __exit serial_pxa_exit(void)
870 {
871 platform_driver_unregister(&serial_pxa_driver);
872 uart_unregister_driver(&serial_pxa_reg);
873 }
874
875 module_init(serial_pxa_init);
876 module_exit(serial_pxa_exit);
877
878 MODULE_LICENSE("GPL");
879 MODULE_ALIAS("platform:pxa2xx-uart");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree