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ext4: Remove duplicate call to ext4_commit_super() in ext4_freeze()
[linux-2.6/mini2440.git] / drivers / serial / pxa.c
blobf6e3b86bb0be7cb26dd1de6ef0a65b60cf805438
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
47 #include <asm/io.h>
48 #include <mach/hardware.h>
49 #include <asm/irq.h>
50 #include <mach/pxa-regs.h>
51 #include <mach/regs-uart.h>
52
53
54 struct uart_pxa_port {
55 struct uart_port port;
56 unsigned char ier;
57 unsigned char lcr;
58 unsigned char mcr;
59 unsigned int lsr_break_flag;
60 struct clk *clk;
61 char *name;
62 };
63
64 static inline unsigned int serial_in(struct uart_pxa_port *up, int offset)
65 {
66 offset <<= 2;
67 return readl(up->port.membase + offset);
68 }
69
70 static inline void serial_out(struct uart_pxa_port *up, int offset, int value)
71 {
72 offset <<= 2;
73 writel(value, up->port.membase + offset);
74 }
75
76 static void serial_pxa_enable_ms(struct uart_port *port)
77 {
78 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
79
80 up->ier |= UART_IER_MSI;
81 serial_out(up, UART_IER, up->ier);
82 }
83
84 static void serial_pxa_stop_tx(struct uart_port *port)
85 {
86 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
87
88 if (up->ier & UART_IER_THRI) {
89 up->ier &= ~UART_IER_THRI;
90 serial_out(up, UART_IER, up->ier);
91 }
92 }
93
94 static void serial_pxa_stop_rx(struct uart_port *port)
95 {
96 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
97
98 up->ier &= ~UART_IER_RLSI;
99 up->port.read_status_mask &= ~UART_LSR_DR;
100 serial_out(up, UART_IER, up->ier);
101 }
102
103 static inline void receive_chars(struct uart_pxa_port *up, int *status)
104 {
105 struct tty_struct *tty = up->port.info->port.tty;
106 unsigned int ch, flag;
107 int max_count = 256;
108
109 do {
110 ch = serial_in(up, UART_RX);
111 flag = TTY_NORMAL;
112 up->port.icount.rx++;
113
114 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
115 UART_LSR_FE | UART_LSR_OE))) {
116 /*
117 * For statistics only
118 */
119 if (*status & UART_LSR_BI) {
120 *status &= ~(UART_LSR_FE | UART_LSR_PE);
121 up->port.icount.brk++;
122 /*
123 * We do the SysRQ and SAK checking
124 * here because otherwise the break
125 * may get masked by ignore_status_mask
126 * or read_status_mask.
127 */
128 if (uart_handle_break(&up->port))
129 goto ignore_char;
130 } else if (*status & UART_LSR_PE)
131 up->port.icount.parity++;
132 else if (*status & UART_LSR_FE)
133 up->port.icount.frame++;
134 if (*status & UART_LSR_OE)
135 up->port.icount.overrun++;
136
137 /*
138 * Mask off conditions which should be ignored.
139 */
140 *status &= up->port.read_status_mask;
141
142 #ifdef CONFIG_SERIAL_PXA_CONSOLE
143 if (up->port.line == up->port.cons->index) {
144 /* Recover the break flag from console xmit */
145 *status |= up->lsr_break_flag;
146 up->lsr_break_flag = 0;
147 }
148 #endif
149 if (*status & UART_LSR_BI) {
150 flag = TTY_BREAK;
151 } else if (*status & UART_LSR_PE)
152 flag = TTY_PARITY;
153 else if (*status & UART_LSR_FE)
154 flag = TTY_FRAME;
155 }
156
157 if (uart_handle_sysrq_char(&up->port, ch))
158 goto ignore_char;
159
160 uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag);
161
162 ignore_char:
163 *status = serial_in(up, UART_LSR);
164 } while ((*status & UART_LSR_DR) && (max_count-- > 0));
165 tty_flip_buffer_push(tty);
166 }
167
168 static void transmit_chars(struct uart_pxa_port *up)
169 {
170 struct circ_buf *xmit = &up->port.info->xmit;
171 int count;
172
173 if (up->port.x_char) {
174 serial_out(up, UART_TX, up->port.x_char);
175 up->port.icount.tx++;
176 up->port.x_char = 0;
177 return;
178 }
179 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
180 serial_pxa_stop_tx(&up->port);
181 return;
182 }
183
184 count = up->port.fifosize / 2;
185 do {
186 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
187 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
188 up->port.icount.tx++;
189 if (uart_circ_empty(xmit))
190 break;
191 } while (--count > 0);
192
193 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
194 uart_write_wakeup(&up->port);
195
196
197 if (uart_circ_empty(xmit))
198 serial_pxa_stop_tx(&up->port);
199 }
200
201 static void serial_pxa_start_tx(struct uart_port *port)
202 {
203 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
204
205 if (!(up->ier & UART_IER_THRI)) {
206 up->ier |= UART_IER_THRI;
207 serial_out(up, UART_IER, up->ier);
208 }
209 }
210
211 static inline void check_modem_status(struct uart_pxa_port *up)
212 {
213 int status;
214
215 status = serial_in(up, UART_MSR);
216
217 if ((status & UART_MSR_ANY_DELTA) == 0)
218 return;
219
220 if (status & UART_MSR_TERI)
221 up->port.icount.rng++;
222 if (status & UART_MSR_DDSR)
223 up->port.icount.dsr++;
224 if (status & UART_MSR_DDCD)
225 uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
226 if (status & UART_MSR_DCTS)
227 uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
228
229 wake_up_interruptible(&up->port.info->delta_msr_wait);
230 }
231
232 /*
233 * This handles the interrupt from one port.
234 */
235 static inline irqreturn_t serial_pxa_irq(int irq, void *dev_id)
236 {
237 struct uart_pxa_port *up = dev_id;
238 unsigned int iir, lsr;
239
240 iir = serial_in(up, UART_IIR);
241 if (iir & UART_IIR_NO_INT)
242 return IRQ_NONE;
243 lsr = serial_in(up, UART_LSR);
244 if (lsr & UART_LSR_DR)
245 receive_chars(up, &lsr);
246 check_modem_status(up);
247 if (lsr & UART_LSR_THRE)
248 transmit_chars(up);
249 return IRQ_HANDLED;
250 }
251
252 static unsigned int serial_pxa_tx_empty(struct uart_port *port)
253 {
254 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
255 unsigned long flags;
256 unsigned int ret;
257
258 spin_lock_irqsave(&up->port.lock, flags);
259 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
260 spin_unlock_irqrestore(&up->port.lock, flags);
261
262 return ret;
263 }
264
265 static unsigned int serial_pxa_get_mctrl(struct uart_port *port)
266 {
267 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
268 unsigned char status;
269 unsigned int ret;
270
271 status = serial_in(up, UART_MSR);
272
273 ret = 0;
274 if (status & UART_MSR_DCD)
275 ret |= TIOCM_CAR;
276 if (status & UART_MSR_RI)
277 ret |= TIOCM_RNG;
278 if (status & UART_MSR_DSR)
279 ret |= TIOCM_DSR;
280 if (status & UART_MSR_CTS)
281 ret |= TIOCM_CTS;
282 return ret;
283 }
284
285 static void serial_pxa_set_mctrl(struct uart_port *port, unsigned int mctrl)
286 {
287 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
288 unsigned char mcr = 0;
289
290 if (mctrl & TIOCM_RTS)
291 mcr |= UART_MCR_RTS;
292 if (mctrl & TIOCM_DTR)
293 mcr |= UART_MCR_DTR;
294 if (mctrl & TIOCM_OUT1)
295 mcr |= UART_MCR_OUT1;
296 if (mctrl & TIOCM_OUT2)
297 mcr |= UART_MCR_OUT2;
298 if (mctrl & TIOCM_LOOP)
299 mcr |= UART_MCR_LOOP;
300
301 mcr |= up->mcr;
302
303 serial_out(up, UART_MCR, mcr);
304 }
305
306 static void serial_pxa_break_ctl(struct uart_port *port, int break_state)
307 {
308 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
309 unsigned long flags;
310
311 spin_lock_irqsave(&up->port.lock, flags);
312 if (break_state == -1)
313 up->lcr |= UART_LCR_SBC;
314 else
315 up->lcr &= ~UART_LCR_SBC;
316 serial_out(up, UART_LCR, up->lcr);
317 spin_unlock_irqrestore(&up->port.lock, flags);
318 }
319
320 #if 0
321 static void serial_pxa_dma_init(struct pxa_uart *up)
322 {
323 up->rxdma =
324 pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_receive_dma, up);
325 if (up->rxdma < 0)
326 goto out;
327 up->txdma =
328 pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_transmit_dma, up);
329 if (up->txdma < 0)
330 goto err_txdma;
331 up->dmadesc = kmalloc(4 * sizeof(pxa_dma_desc), GFP_KERNEL);
332 if (!up->dmadesc)
333 goto err_alloc;
334
335 /* ... */
336 err_alloc:
337 pxa_free_dma(up->txdma);
338 err_rxdma:
339 pxa_free_dma(up->rxdma);
340 out:
341 return;
342 }
343 #endif
344
345 static int serial_pxa_startup(struct uart_port *port)
346 {
347 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
348 unsigned long flags;
349 int retval;
350
351 if (port->line == 3) /* HWUART */
352 up->mcr |= UART_MCR_AFE;
353 else
354 up->mcr = 0;
355
356 up->port.uartclk = clk_get_rate(up->clk);
357
358 /*
359 * Allocate the IRQ
360 */
361 retval = request_irq(up->port.irq, serial_pxa_irq, 0, up->name, up);
362 if (retval)
363 return retval;
364
365 /*
366 * Clear the FIFO buffers and disable them.
367 * (they will be reenabled in set_termios())
368 */
369 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
370 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
371 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
372 serial_out(up, UART_FCR, 0);
373
374 /*
375 * Clear the interrupt registers.
376 */
377 (void) serial_in(up, UART_LSR);
378 (void) serial_in(up, UART_RX);
379 (void) serial_in(up, UART_IIR);
380 (void) serial_in(up, UART_MSR);
381
382 /*
383 * Now, initialize the UART
384 */
385 serial_out(up, UART_LCR, UART_LCR_WLEN8);
386
387 spin_lock_irqsave(&up->port.lock, flags);
388 up->port.mctrl |= TIOCM_OUT2;
389 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
390 spin_unlock_irqrestore(&up->port.lock, flags);
391
392 /*
393 * Finally, enable interrupts. Note: Modem status interrupts
394 * are set via set_termios(), which will be occurring imminently
395 * anyway, so we don't enable them here.
396 */
397 up->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE;
398 serial_out(up, UART_IER, up->ier);
399
400 /*
401 * And clear the interrupt registers again for luck.
402 */
403 (void) serial_in(up, UART_LSR);
404 (void) serial_in(up, UART_RX);
405 (void) serial_in(up, UART_IIR);
406 (void) serial_in(up, UART_MSR);
407
408 return 0;
409 }
410
411 static void serial_pxa_shutdown(struct uart_port *port)
412 {
413 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
414 unsigned long flags;
415
416 free_irq(up->port.irq, up);
417
418 /*
419 * Disable interrupts from this port
420 */
421 up->ier = 0;
422 serial_out(up, UART_IER, 0);
423
424 spin_lock_irqsave(&up->port.lock, flags);
425 up->port.mctrl &= ~TIOCM_OUT2;
426 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
427 spin_unlock_irqrestore(&up->port.lock, flags);
428
429 /*
430 * Disable break condition and FIFOs
431 */
432 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
433 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
434 UART_FCR_CLEAR_RCVR |
435 UART_FCR_CLEAR_XMIT);
436 serial_out(up, UART_FCR, 0);
437 }
438
439 static void
440 serial_pxa_set_termios(struct uart_port *port, struct ktermios *termios,
441 struct ktermios *old)
442 {
443 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
444 unsigned char cval, fcr = 0;
445 unsigned long flags;
446 unsigned int baud, quot;
447
448 switch (termios->c_cflag & CSIZE) {
449 case CS5:
450 cval = UART_LCR_WLEN5;
451 break;
452 case CS6:
453 cval = UART_LCR_WLEN6;
454 break;
455 case CS7:
456 cval = UART_LCR_WLEN7;
457 break;
458 default:
459 case CS8:
460 cval = UART_LCR_WLEN8;
461 break;
462 }
463
464 if (termios->c_cflag & CSTOPB)
465 cval |= UART_LCR_STOP;
466 if (termios->c_cflag & PARENB)
467 cval |= UART_LCR_PARITY;
468 if (!(termios->c_cflag & PARODD))
469 cval |= UART_LCR_EPAR;
470
471 /*
472 * Ask the core to calculate the divisor for us.
473 */
474 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
475 quot = uart_get_divisor(port, baud);
476
477 if ((up->port.uartclk / quot) < (2400 * 16))
478 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR1;
479 else if ((up->port.uartclk / quot) < (230400 * 16))
480 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR8;
481 else
482 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR32;
483
484 /*
485 * Ok, we're now changing the port state. Do it with
486 * interrupts disabled.
487 */
488 spin_lock_irqsave(&up->port.lock, flags);
489
490 /*
491 * Ensure the port will be enabled.
492 * This is required especially for serial console.
493 */
494 up->ier |= IER_UUE;
495
496 /*
497 * Update the per-port timeout.
498 */
499 uart_update_timeout(port, termios->c_cflag, baud);
500
501 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
502 if (termios->c_iflag & INPCK)
503 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
504 if (termios->c_iflag & (BRKINT | PARMRK))
505 up->port.read_status_mask |= UART_LSR_BI;
506
507 /*
508 * Characters to ignore
509 */
510 up->port.ignore_status_mask = 0;
511 if (termios->c_iflag & IGNPAR)
512 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
513 if (termios->c_iflag & IGNBRK) {
514 up->port.ignore_status_mask |= UART_LSR_BI;
515 /*
516 * If we're ignoring parity and break indicators,
517 * ignore overruns too (for real raw support).
518 */
519 if (termios->c_iflag & IGNPAR)
520 up->port.ignore_status_mask |= UART_LSR_OE;
521 }
522
523 /*
524 * ignore all characters if CREAD is not set
525 */
526 if ((termios->c_cflag & CREAD) == 0)
527 up->port.ignore_status_mask |= UART_LSR_DR;
528
529 /*
530 * CTS flow control flag and modem status interrupts
531 */
532 up->ier &= ~UART_IER_MSI;
533 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
534 up->ier |= UART_IER_MSI;
535
536 serial_out(up, UART_IER, up->ier);
537
538 if (termios->c_cflag & CRTSCTS)
539 up->mcr |= UART_MCR_AFE;
540 else
541 up->mcr &= ~UART_MCR_AFE;
542
543 serial_out(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
544 serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */
545 serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */
546 serial_out(up, UART_LCR, cval); /* reset DLAB */
547 up->lcr = cval; /* Save LCR */
548 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
549 serial_out(up, UART_FCR, fcr);
550 spin_unlock_irqrestore(&up->port.lock, flags);
551 }
552
553 static void
554 serial_pxa_pm(struct uart_port *port, unsigned int state,
555 unsigned int oldstate)
556 {
557 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
558
559 if (!state)
560 clk_enable(up->clk);
561 else
562 clk_disable(up->clk);
563 }
564
565 static void serial_pxa_release_port(struct uart_port *port)
566 {
567 }
568
569 static int serial_pxa_request_port(struct uart_port *port)
570 {
571 return 0;
572 }
573
574 static void serial_pxa_config_port(struct uart_port *port, int flags)
575 {
576 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
577 up->port.type = PORT_PXA;
578 }
579
580 static int
581 serial_pxa_verify_port(struct uart_port *port, struct serial_struct *ser)
582 {
583 /* we don't want the core code to modify any port params */
584 return -EINVAL;
585 }
586
587 static const char *
588 serial_pxa_type(struct uart_port *port)
589 {
590 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
591 return up->name;
592 }
593
594 static struct uart_pxa_port *serial_pxa_ports[4];
595 static struct uart_driver serial_pxa_reg;
596
597 #ifdef CONFIG_SERIAL_PXA_CONSOLE
598
599 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
600
601 /*
602 * Wait for transmitter & holding register to empty
603 */
604 static inline void wait_for_xmitr(struct uart_pxa_port *up)
605 {
606 unsigned int status, tmout = 10000;
607
608 /* Wait up to 10ms for the character(s) to be sent. */
609 do {
610 status = serial_in(up, UART_LSR);
611
612 if (status & UART_LSR_BI)
613 up->lsr_break_flag = UART_LSR_BI;
614
615 if (--tmout == 0)
616 break;
617 udelay(1);
618 } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
619
620 /* Wait up to 1s for flow control if necessary */
621 if (up->port.flags & UPF_CONS_FLOW) {
622 tmout = 1000000;
623 while (--tmout &&
624 ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
625 udelay(1);
626 }
627 }
628
629 static void serial_pxa_console_putchar(struct uart_port *port, int ch)
630 {
631 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
632
633 wait_for_xmitr(up);
634 serial_out(up, UART_TX, ch);
635 }
636
637 /*
638 * Print a string to the serial port trying not to disturb
639 * any possible real use of the port...
640 *
641 * The console_lock must be held when we get here.
642 */
643 static void
644 serial_pxa_console_write(struct console *co, const char *s, unsigned int count)
645 {
646 struct uart_pxa_port *up = serial_pxa_ports[co->index];
647 unsigned int ier;
648
649 clk_enable(up->clk);
650
651 /*
652 * First save the IER then disable the interrupts
653 */
654 ier = serial_in(up, UART_IER);
655 serial_out(up, UART_IER, UART_IER_UUE);
656
657 uart_console_write(&up->port, s, count, serial_pxa_console_putchar);
658
659 /*
660 * Finally, wait for transmitter to become empty
661 * and restore the IER
662 */
663 wait_for_xmitr(up);
664 serial_out(up, UART_IER, ier);
665
666 clk_disable(up->clk);
667 }
668
669 static int __init
670 serial_pxa_console_setup(struct console *co, char *options)
671 {
672 struct uart_pxa_port *up;
673 int baud = 9600;
674 int bits = 8;
675 int parity = 'n';
676 int flow = 'n';
677
678 if (co->index == -1 || co->index >= serial_pxa_reg.nr)
679 co->index = 0;
680 up = serial_pxa_ports[co->index];
681 if (!up)
682 return -ENODEV;
683
684 if (options)
685 uart_parse_options(options, &baud, &parity, &bits, &flow);
686
687 return uart_set_options(&up->port, co, baud, parity, bits, flow);
688 }
689
690 static struct console serial_pxa_console = {
691 .name = "ttyS",
692 .write = serial_pxa_console_write,
693 .device = uart_console_device,
694 .setup = serial_pxa_console_setup,
695 .flags = CON_PRINTBUFFER,
696 .index = -1,
697 .data = &serial_pxa_reg,
698 };
699
700 #define PXA_CONSOLE &serial_pxa_console
701 #else
702 #define PXA_CONSOLE NULL
703 #endif
704
705 struct uart_ops serial_pxa_pops = {
706 .tx_empty = serial_pxa_tx_empty,
707 .set_mctrl = serial_pxa_set_mctrl,
708 .get_mctrl = serial_pxa_get_mctrl,
709 .stop_tx = serial_pxa_stop_tx,
710 .start_tx = serial_pxa_start_tx,
711 .stop_rx = serial_pxa_stop_rx,
712 .enable_ms = serial_pxa_enable_ms,
713 .break_ctl = serial_pxa_break_ctl,
714 .startup = serial_pxa_startup,
715 .shutdown = serial_pxa_shutdown,
716 .set_termios = serial_pxa_set_termios,
717 .pm = serial_pxa_pm,
718 .type = serial_pxa_type,
719 .release_port = serial_pxa_release_port,
720 .request_port = serial_pxa_request_port,
721 .config_port = serial_pxa_config_port,
722 .verify_port = serial_pxa_verify_port,
723 };
724
725 static struct uart_driver serial_pxa_reg = {
726 .owner = THIS_MODULE,
727 .driver_name = "PXA serial",
728 .dev_name = "ttyS",
729 .major = TTY_MAJOR,
730 .minor = 64,
731 .nr = 4,
732 .cons = PXA_CONSOLE,
733 };
734
735 static int serial_pxa_suspend(struct platform_device *dev, pm_message_t state)
736 {
737 struct uart_pxa_port *sport = platform_get_drvdata(dev);
738
739 if (sport)
740 uart_suspend_port(&serial_pxa_reg, &sport->port);
741
742 return 0;
743 }
744
745 static int serial_pxa_resume(struct platform_device *dev)
746 {
747 struct uart_pxa_port *sport = platform_get_drvdata(dev);
748
749 if (sport)
750 uart_resume_port(&serial_pxa_reg, &sport->port);
751
752 return 0;
753 }
754
755 static int serial_pxa_probe(struct platform_device *dev)
756 {
757 struct uart_pxa_port *sport;
758 struct resource *mmres, *irqres;
759 int ret;
760
761 mmres = platform_get_resource(dev, IORESOURCE_MEM, 0);
762 irqres = platform_get_resource(dev, IORESOURCE_IRQ, 0);
763 if (!mmres || !irqres)
764 return -ENODEV;
765
766 sport = kzalloc(sizeof(struct uart_pxa_port), GFP_KERNEL);
767 if (!sport)
768 return -ENOMEM;
769
770 sport->clk = clk_get(&dev->dev, NULL);
771 if (IS_ERR(sport->clk)) {
772 ret = PTR_ERR(sport->clk);
773 goto err_free;
774 }
775
776 sport->port.type = PORT_PXA;
777 sport->port.iotype = UPIO_MEM;
778 sport->port.mapbase = mmres->start;
779 sport->port.irq = irqres->start;
780 sport->port.fifosize = 64;
781 sport->port.ops = &serial_pxa_pops;
782 sport->port.line = dev->id;
783 sport->port.dev = &dev->dev;
784 sport->port.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
785 sport->port.uartclk = clk_get_rate(sport->clk);
786
787 /*
788 * Is it worth keeping this?
789 */
790 if (mmres->start == __PREG(FFUART))
791 sport->name = "FFUART";
792 else if (mmres->start == __PREG(BTUART))
793 sport->name = "BTUART";
794 else if (mmres->start == __PREG(STUART))
795 sport->name = "STUART";
796 else if (mmres->start == __PREG(HWUART))
797 sport->name = "HWUART";
798 else
799 sport->name = "???";
800
801 sport->port.membase = ioremap(mmres->start, mmres->end - mmres->start + 1);
802 if (!sport->port.membase) {
803 ret = -ENOMEM;
804 goto err_clk;
805 }
806
807 serial_pxa_ports[dev->id] = sport;
808
809 uart_add_one_port(&serial_pxa_reg, &sport->port);
810 platform_set_drvdata(dev, sport);
811
812 return 0;
813
814 err_clk:
815 clk_put(sport->clk);
816 err_free:
817 kfree(sport);
818 return ret;
819 }
820
821 static int serial_pxa_remove(struct platform_device *dev)
822 {
823 struct uart_pxa_port *sport = platform_get_drvdata(dev);
824
825 platform_set_drvdata(dev, NULL);
826
827 uart_remove_one_port(&serial_pxa_reg, &sport->port);
828 clk_put(sport->clk);
829 kfree(sport);
830
831 return 0;
832 }
833
834 static struct platform_driver serial_pxa_driver = {
835 .probe = serial_pxa_probe,
836 .remove = serial_pxa_remove,
837
838 .suspend = serial_pxa_suspend,
839 .resume = serial_pxa_resume,
840 .driver = {
841 .name = "pxa2xx-uart",
842 .owner = THIS_MODULE,
843 },
844 };
845
846 int __init serial_pxa_init(void)
847 {
848 int ret;
849
850 ret = uart_register_driver(&serial_pxa_reg);
851 if (ret != 0)
852 return ret;
853
854 ret = platform_driver_register(&serial_pxa_driver);
855 if (ret != 0)
856 uart_unregister_driver(&serial_pxa_reg);
857
858 return ret;
859 }
860
861 void __exit serial_pxa_exit(void)
862 {
863 platform_driver_unregister(&serial_pxa_driver);
864 uart_unregister_driver(&serial_pxa_reg);
865 }
866
867 module_init(serial_pxa_init);
868 module_exit(serial_pxa_exit);
869
870 MODULE_LICENSE("GPL");
871 MODULE_ALIAS("platform:pxa2xx-uart");
Support for the Chinese Samsung S3C2440 based development boards