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3C509: rx_bytes should not be increased when alloc_skb failed
[linux-2.6/mini2440.git] / drivers / serial / pxa.c
blobb4f7ffb7688d16b99facc3bd859042836bc66246
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 <asm/hardware.h>
49 #include <asm/irq.h>
50 #include <asm/arch/pxa-regs.h>
51
52
53 struct uart_pxa_port {
54 struct uart_port port;
55 unsigned char ier;
56 unsigned char lcr;
57 unsigned char mcr;
58 unsigned int lsr_break_flag;
59 struct clk *clk;
60 char *name;
61 };
62
63 static inline unsigned int serial_in(struct uart_pxa_port *up, int offset)
64 {
65 offset <<= 2;
66 return readl(up->port.membase + offset);
67 }
68
69 static inline void serial_out(struct uart_pxa_port *up, int offset, int value)
70 {
71 offset <<= 2;
72 writel(value, up->port.membase + offset);
73 }
74
75 static void serial_pxa_enable_ms(struct uart_port *port)
76 {
77 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
78
79 up->ier |= UART_IER_MSI;
80 serial_out(up, UART_IER, up->ier);
81 }
82
83 static void serial_pxa_stop_tx(struct uart_port *port)
84 {
85 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
86
87 if (up->ier & UART_IER_THRI) {
88 up->ier &= ~UART_IER_THRI;
89 serial_out(up, UART_IER, up->ier);
90 }
91 }
92
93 static void serial_pxa_stop_rx(struct uart_port *port)
94 {
95 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
96
97 up->ier &= ~UART_IER_RLSI;
98 up->port.read_status_mask &= ~UART_LSR_DR;
99 serial_out(up, UART_IER, up->ier);
100 }
101
102 static inline void receive_chars(struct uart_pxa_port *up, int *status)
103 {
104 struct tty_struct *tty = up->port.info->tty;
105 unsigned int ch, flag;
106 int max_count = 256;
107
108 do {
109 ch = serial_in(up, UART_RX);
110 flag = TTY_NORMAL;
111 up->port.icount.rx++;
112
113 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
114 UART_LSR_FE | UART_LSR_OE))) {
115 /*
116 * For statistics only
117 */
118 if (*status & UART_LSR_BI) {
119 *status &= ~(UART_LSR_FE | UART_LSR_PE);
120 up->port.icount.brk++;
121 /*
122 * We do the SysRQ and SAK checking
123 * here because otherwise the break
124 * may get masked by ignore_status_mask
125 * or read_status_mask.
126 */
127 if (uart_handle_break(&up->port))
128 goto ignore_char;
129 } else if (*status & UART_LSR_PE)
130 up->port.icount.parity++;
131 else if (*status & UART_LSR_FE)
132 up->port.icount.frame++;
133 if (*status & UART_LSR_OE)
134 up->port.icount.overrun++;
135
136 /*
137 * Mask off conditions which should be ignored.
138 */
139 *status &= up->port.read_status_mask;
140
141 #ifdef CONFIG_SERIAL_PXA_CONSOLE
142 if (up->port.line == up->port.cons->index) {
143 /* Recover the break flag from console xmit */
144 *status |= up->lsr_break_flag;
145 up->lsr_break_flag = 0;
146 }
147 #endif
148 if (*status & UART_LSR_BI) {
149 flag = TTY_BREAK;
150 } else if (*status & UART_LSR_PE)
151 flag = TTY_PARITY;
152 else if (*status & UART_LSR_FE)
153 flag = TTY_FRAME;
154 }
155
156 if (uart_handle_sysrq_char(&up->port, ch))
157 goto ignore_char;
158
159 uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag);
160
161 ignore_char:
162 *status = serial_in(up, UART_LSR);
163 } while ((*status & UART_LSR_DR) && (max_count-- > 0));
164 tty_flip_buffer_push(tty);
165 }
166
167 static void transmit_chars(struct uart_pxa_port *up)
168 {
169 struct circ_buf *xmit = &up->port.info->xmit;
170 int count;
171
172 if (up->port.x_char) {
173 serial_out(up, UART_TX, up->port.x_char);
174 up->port.icount.tx++;
175 up->port.x_char = 0;
176 return;
177 }
178 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
179 serial_pxa_stop_tx(&up->port);
180 return;
181 }
182
183 count = up->port.fifosize / 2;
184 do {
185 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
186 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
187 up->port.icount.tx++;
188 if (uart_circ_empty(xmit))
189 break;
190 } while (--count > 0);
191
192 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
193 uart_write_wakeup(&up->port);
194
195
196 if (uart_circ_empty(xmit))
197 serial_pxa_stop_tx(&up->port);
198 }
199
200 static void serial_pxa_start_tx(struct uart_port *port)
201 {
202 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
203
204 if (!(up->ier & UART_IER_THRI)) {
205 up->ier |= UART_IER_THRI;
206 serial_out(up, UART_IER, up->ier);
207 }
208 }
209
210 static inline void check_modem_status(struct uart_pxa_port *up)
211 {
212 int status;
213
214 status = serial_in(up, UART_MSR);
215
216 if ((status & UART_MSR_ANY_DELTA) == 0)
217 return;
218
219 if (status & UART_MSR_TERI)
220 up->port.icount.rng++;
221 if (status & UART_MSR_DDSR)
222 up->port.icount.dsr++;
223 if (status & UART_MSR_DDCD)
224 uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
225 if (status & UART_MSR_DCTS)
226 uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
227
228 wake_up_interruptible(&up->port.info->delta_msr_wait);
229 }
230
231 /*
232 * This handles the interrupt from one port.
233 */
234 static inline irqreturn_t serial_pxa_irq(int irq, void *dev_id)
235 {
236 struct uart_pxa_port *up = dev_id;
237 unsigned int iir, lsr;
238
239 iir = serial_in(up, UART_IIR);
240 if (iir & UART_IIR_NO_INT)
241 return IRQ_NONE;
242 lsr = serial_in(up, UART_LSR);
243 if (lsr & UART_LSR_DR)
244 receive_chars(up, &lsr);
245 check_modem_status(up);
246 if (lsr & UART_LSR_THRE)
247 transmit_chars(up);
248 return IRQ_HANDLED;
249 }
250
251 static unsigned int serial_pxa_tx_empty(struct uart_port *port)
252 {
253 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
254 unsigned long flags;
255 unsigned int ret;
256
257 spin_lock_irqsave(&up->port.lock, flags);
258 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
259 spin_unlock_irqrestore(&up->port.lock, flags);
260
261 return ret;
262 }
263
264 static unsigned int serial_pxa_get_mctrl(struct uart_port *port)
265 {
266 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
267 unsigned char status;
268 unsigned int ret;
269
270 status = serial_in(up, UART_MSR);
271
272 ret = 0;
273 if (status & UART_MSR_DCD)
274 ret |= TIOCM_CAR;
275 if (status & UART_MSR_RI)
276 ret |= TIOCM_RNG;
277 if (status & UART_MSR_DSR)
278 ret |= TIOCM_DSR;
279 if (status & UART_MSR_CTS)
280 ret |= TIOCM_CTS;
281 return ret;
282 }
283
284 static void serial_pxa_set_mctrl(struct uart_port *port, unsigned int mctrl)
285 {
286 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
287 unsigned char mcr = 0;
288
289 if (mctrl & TIOCM_RTS)
290 mcr |= UART_MCR_RTS;
291 if (mctrl & TIOCM_DTR)
292 mcr |= UART_MCR_DTR;
293 if (mctrl & TIOCM_OUT1)
294 mcr |= UART_MCR_OUT1;
295 if (mctrl & TIOCM_OUT2)
296 mcr |= UART_MCR_OUT2;
297 if (mctrl & TIOCM_LOOP)
298 mcr |= UART_MCR_LOOP;
299
300 mcr |= up->mcr;
301
302 serial_out(up, UART_MCR, mcr);
303 }
304
305 static void serial_pxa_break_ctl(struct uart_port *port, int break_state)
306 {
307 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
308 unsigned long flags;
309
310 spin_lock_irqsave(&up->port.lock, flags);
311 if (break_state == -1)
312 up->lcr |= UART_LCR_SBC;
313 else
314 up->lcr &= ~UART_LCR_SBC;
315 serial_out(up, UART_LCR, up->lcr);
316 spin_unlock_irqrestore(&up->port.lock, flags);
317 }
318
319 #if 0
320 static void serial_pxa_dma_init(struct pxa_uart *up)
321 {
322 up->rxdma =
323 pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_receive_dma, up);
324 if (up->rxdma < 0)
325 goto out;
326 up->txdma =
327 pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_transmit_dma, up);
328 if (up->txdma < 0)
329 goto err_txdma;
330 up->dmadesc = kmalloc(4 * sizeof(pxa_dma_desc), GFP_KERNEL);
331 if (!up->dmadesc)
332 goto err_alloc;
333
334 /* ... */
335 err_alloc:
336 pxa_free_dma(up->txdma);
337 err_rxdma:
338 pxa_free_dma(up->rxdma);
339 out:
340 return;
341 }
342 #endif
343
344 static int serial_pxa_startup(struct uart_port *port)
345 {
346 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
347 unsigned long flags;
348 int retval;
349
350 if (port->line == 3) /* HWUART */
351 up->mcr |= UART_MCR_AFE;
352 else
353 up->mcr = 0;
354
355 up->port.uartclk = clk_get_rate(up->clk);
356
357 /*
358 * Allocate the IRQ
359 */
360 retval = request_irq(up->port.irq, serial_pxa_irq, 0, up->name, up);
361 if (retval)
362 return retval;
363
364 /*
365 * Clear the FIFO buffers and disable them.
366 * (they will be reenabled in set_termios())
367 */
368 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
369 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
370 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
371 serial_out(up, UART_FCR, 0);
372
373 /*
374 * Clear the interrupt registers.
375 */
376 (void) serial_in(up, UART_LSR);
377 (void) serial_in(up, UART_RX);
378 (void) serial_in(up, UART_IIR);
379 (void) serial_in(up, UART_MSR);
380
381 /*
382 * Now, initialize the UART
383 */
384 serial_out(up, UART_LCR, UART_LCR_WLEN8);
385
386 spin_lock_irqsave(&up->port.lock, flags);
387 up->port.mctrl |= TIOCM_OUT2;
388 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
389 spin_unlock_irqrestore(&up->port.lock, flags);
390
391 /*
392 * Finally, enable interrupts. Note: Modem status interrupts
393 * are set via set_termios(), which will be occurring imminently
394 * anyway, so we don't enable them here.
395 */
396 up->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE;
397 serial_out(up, UART_IER, up->ier);
398
399 /*
400 * And clear the interrupt registers again for luck.
401 */
402 (void) serial_in(up, UART_LSR);
403 (void) serial_in(up, UART_RX);
404 (void) serial_in(up, UART_IIR);
405 (void) serial_in(up, UART_MSR);
406
407 return 0;
408 }
409
410 static void serial_pxa_shutdown(struct uart_port *port)
411 {
412 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
413 unsigned long flags;
414
415 free_irq(up->port.irq, up);
416
417 /*
418 * Disable interrupts from this port
419 */
420 up->ier = 0;
421 serial_out(up, UART_IER, 0);
422
423 spin_lock_irqsave(&up->port.lock, flags);
424 up->port.mctrl &= ~TIOCM_OUT2;
425 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
426 spin_unlock_irqrestore(&up->port.lock, flags);
427
428 /*
429 * Disable break condition and FIFOs
430 */
431 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
432 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
433 UART_FCR_CLEAR_RCVR |
434 UART_FCR_CLEAR_XMIT);
435 serial_out(up, UART_FCR, 0);
436 }
437
438 static void
439 serial_pxa_set_termios(struct uart_port *port, struct ktermios *termios,
440 struct ktermios *old)
441 {
442 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
443 unsigned char cval, fcr = 0;
444 unsigned long flags;
445 unsigned int baud, quot;
446
447 switch (termios->c_cflag & CSIZE) {
448 case CS5:
449 cval = UART_LCR_WLEN5;
450 break;
451 case CS6:
452 cval = UART_LCR_WLEN6;
453 break;
454 case CS7:
455 cval = UART_LCR_WLEN7;
456 break;
457 default:
458 case CS8:
459 cval = UART_LCR_WLEN8;
460 break;
461 }
462
463 if (termios->c_cflag & CSTOPB)
464 cval |= UART_LCR_STOP;
465 if (termios->c_cflag & PARENB)
466 cval |= UART_LCR_PARITY;
467 if (!(termios->c_cflag & PARODD))
468 cval |= UART_LCR_EPAR;
469
470 /*
471 * Ask the core to calculate the divisor for us.
472 */
473 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
474 quot = uart_get_divisor(port, baud);
475
476 if ((up->port.uartclk / quot) < (2400 * 16))
477 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR1;
478 else if ((up->port.uartclk / quot) < (230400 * 16))
479 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR8;
480 else
481 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR32;
482
483 /*
484 * Ok, we're now changing the port state. Do it with
485 * interrupts disabled.
486 */
487 spin_lock_irqsave(&up->port.lock, flags);
488
489 /*
490 * Ensure the port will be enabled.
491 * This is required especially for serial console.
492 */
493 up->ier |= IER_UUE;
494
495 /*
496 * Update the per-port timeout.
497 */
498 uart_update_timeout(port, termios->c_cflag, baud);
499
500 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
501 if (termios->c_iflag & INPCK)
502 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
503 if (termios->c_iflag & (BRKINT | PARMRK))
504 up->port.read_status_mask |= UART_LSR_BI;
505
506 /*
507 * Characters to ignore
508 */
509 up->port.ignore_status_mask = 0;
510 if (termios->c_iflag & IGNPAR)
511 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
512 if (termios->c_iflag & IGNBRK) {
513 up->port.ignore_status_mask |= UART_LSR_BI;
514 /*
515 * If we're ignoring parity and break indicators,
516 * ignore overruns too (for real raw support).
517 */
518 if (termios->c_iflag & IGNPAR)
519 up->port.ignore_status_mask |= UART_LSR_OE;
520 }
521
522 /*
523 * ignore all characters if CREAD is not set
524 */
525 if ((termios->c_cflag & CREAD) == 0)
526 up->port.ignore_status_mask |= UART_LSR_DR;
527
528 /*
529 * CTS flow control flag and modem status interrupts
530 */
531 up->ier &= ~UART_IER_MSI;
532 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
533 up->ier |= UART_IER_MSI;
534
535 serial_out(up, UART_IER, up->ier);
536
537 serial_out(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
538 serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */
539 serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */
540 serial_out(up, UART_LCR, cval); /* reset DLAB */
541 up->lcr = cval; /* Save LCR */
542 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
543 serial_out(up, UART_FCR, fcr);
544 spin_unlock_irqrestore(&up->port.lock, flags);
545 }
546
547 static void
548 serial_pxa_pm(struct uart_port *port, unsigned int state,
549 unsigned int oldstate)
550 {
551 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
552
553 if (!state)
554 clk_enable(up->clk);
555 else
556 clk_disable(up->clk);
557 }
558
559 static void serial_pxa_release_port(struct uart_port *port)
560 {
561 }
562
563 static int serial_pxa_request_port(struct uart_port *port)
564 {
565 return 0;
566 }
567
568 static void serial_pxa_config_port(struct uart_port *port, int flags)
569 {
570 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
571 up->port.type = PORT_PXA;
572 }
573
574 static int
575 serial_pxa_verify_port(struct uart_port *port, struct serial_struct *ser)
576 {
577 /* we don't want the core code to modify any port params */
578 return -EINVAL;
579 }
580
581 static const char *
582 serial_pxa_type(struct uart_port *port)
583 {
584 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
585 return up->name;
586 }
587
588 static struct uart_pxa_port *serial_pxa_ports[4];
589 static struct uart_driver serial_pxa_reg;
590
591 #ifdef CONFIG_SERIAL_PXA_CONSOLE
592
593 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
594
595 /*
596 * Wait for transmitter & holding register to empty
597 */
598 static inline void wait_for_xmitr(struct uart_pxa_port *up)
599 {
600 unsigned int status, tmout = 10000;
601
602 /* Wait up to 10ms for the character(s) to be sent. */
603 do {
604 status = serial_in(up, UART_LSR);
605
606 if (status & UART_LSR_BI)
607 up->lsr_break_flag = UART_LSR_BI;
608
609 if (--tmout == 0)
610 break;
611 udelay(1);
612 } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
613
614 /* Wait up to 1s for flow control if necessary */
615 if (up->port.flags & UPF_CONS_FLOW) {
616 tmout = 1000000;
617 while (--tmout &&
618 ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
619 udelay(1);
620 }
621 }
622
623 static void serial_pxa_console_putchar(struct uart_port *port, int ch)
624 {
625 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
626
627 wait_for_xmitr(up);
628 serial_out(up, UART_TX, ch);
629 }
630
631 /*
632 * Print a string to the serial port trying not to disturb
633 * any possible real use of the port...
634 *
635 * The console_lock must be held when we get here.
636 */
637 static void
638 serial_pxa_console_write(struct console *co, const char *s, unsigned int count)
639 {
640 struct uart_pxa_port *up = serial_pxa_ports[co->index];
641 unsigned int ier;
642
643 clk_enable(up->clk);
644
645 /*
646 * First save the IER then disable the interrupts
647 */
648 ier = serial_in(up, UART_IER);
649 serial_out(up, UART_IER, UART_IER_UUE);
650
651 uart_console_write(&up->port, s, count, serial_pxa_console_putchar);
652
653 /*
654 * Finally, wait for transmitter to become empty
655 * and restore the IER
656 */
657 wait_for_xmitr(up);
658 serial_out(up, UART_IER, ier);
659
660 clk_disable(up->clk);
661 }
662
663 static int __init
664 serial_pxa_console_setup(struct console *co, char *options)
665 {
666 struct uart_pxa_port *up;
667 int baud = 9600;
668 int bits = 8;
669 int parity = 'n';
670 int flow = 'n';
671
672 if (co->index == -1 || co->index >= serial_pxa_reg.nr)
673 co->index = 0;
674 up = serial_pxa_ports[co->index];
675 if (!up)
676 return -ENODEV;
677
678 if (options)
679 uart_parse_options(options, &baud, &parity, &bits, &flow);
680
681 return uart_set_options(&up->port, co, baud, parity, bits, flow);
682 }
683
684 static struct console serial_pxa_console = {
685 .name = "ttyS",
686 .write = serial_pxa_console_write,
687 .device = uart_console_device,
688 .setup = serial_pxa_console_setup,
689 .flags = CON_PRINTBUFFER,
690 .index = -1,
691 .data = &serial_pxa_reg,
692 };
693
694 #define PXA_CONSOLE &serial_pxa_console
695 #else
696 #define PXA_CONSOLE NULL
697 #endif
698
699 struct uart_ops serial_pxa_pops = {
700 .tx_empty = serial_pxa_tx_empty,
701 .set_mctrl = serial_pxa_set_mctrl,
702 .get_mctrl = serial_pxa_get_mctrl,
703 .stop_tx = serial_pxa_stop_tx,
704 .start_tx = serial_pxa_start_tx,
705 .stop_rx = serial_pxa_stop_rx,
706 .enable_ms = serial_pxa_enable_ms,
707 .break_ctl = serial_pxa_break_ctl,
708 .startup = serial_pxa_startup,
709 .shutdown = serial_pxa_shutdown,
710 .set_termios = serial_pxa_set_termios,
711 .pm = serial_pxa_pm,
712 .type = serial_pxa_type,
713 .release_port = serial_pxa_release_port,
714 .request_port = serial_pxa_request_port,
715 .config_port = serial_pxa_config_port,
716 .verify_port = serial_pxa_verify_port,
717 };
718
719 static struct uart_driver serial_pxa_reg = {
720 .owner = THIS_MODULE,
721 .driver_name = "PXA serial",
722 .dev_name = "ttyS",
723 .major = TTY_MAJOR,
724 .minor = 64,
725 .nr = 4,
726 .cons = PXA_CONSOLE,
727 };
728
729 static int serial_pxa_suspend(struct platform_device *dev, pm_message_t state)
730 {
731 struct uart_pxa_port *sport = platform_get_drvdata(dev);
732
733 if (sport)
734 uart_suspend_port(&serial_pxa_reg, &sport->port);
735
736 return 0;
737 }
738
739 static int serial_pxa_resume(struct platform_device *dev)
740 {
741 struct uart_pxa_port *sport = platform_get_drvdata(dev);
742
743 if (sport)
744 uart_resume_port(&serial_pxa_reg, &sport->port);
745
746 return 0;
747 }
748
749 static int serial_pxa_probe(struct platform_device *dev)
750 {
751 struct uart_pxa_port *sport;
752 struct resource *mmres, *irqres;
753 int ret;
754
755 mmres = platform_get_resource(dev, IORESOURCE_MEM, 0);
756 irqres = platform_get_resource(dev, IORESOURCE_IRQ, 0);
757 if (!mmres || !irqres)
758 return -ENODEV;
759
760 sport = kzalloc(sizeof(struct uart_pxa_port), GFP_KERNEL);
761 if (!sport)
762 return -ENOMEM;
763
764 sport->clk = clk_get(&dev->dev, "UARTCLK");
765 if (IS_ERR(sport->clk)) {
766 ret = PTR_ERR(sport->clk);
767 goto err_free;
768 }
769
770 sport->port.type = PORT_PXA;
771 sport->port.iotype = UPIO_MEM;
772 sport->port.mapbase = mmres->start;
773 sport->port.irq = irqres->start;
774 sport->port.fifosize = 64;
775 sport->port.ops = &serial_pxa_pops;
776 sport->port.line = dev->id;
777 sport->port.dev = &dev->dev;
778 sport->port.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
779 sport->port.uartclk = clk_get_rate(sport->clk);
780
781 /*
782 * Is it worth keeping this?
783 */
784 if (mmres->start == __PREG(FFUART))
785 sport->name = "FFUART";
786 else if (mmres->start == __PREG(BTUART))
787 sport->name = "BTUART";
788 else if (mmres->start == __PREG(STUART))
789 sport->name = "STUART";
790 else if (mmres->start == __PREG(HWUART))
791 sport->name = "HWUART";
792 else
793 sport->name = "???";
794
795 sport->port.membase = ioremap(mmres->start, mmres->end - mmres->start + 1);
796 if (!sport->port.membase) {
797 ret = -ENOMEM;
798 goto err_clk;
799 }
800
801 serial_pxa_ports[dev->id] = sport;
802
803 uart_add_one_port(&serial_pxa_reg, &sport->port);
804 platform_set_drvdata(dev, sport);
805
806 return 0;
807
808 err_clk:
809 clk_put(sport->clk);
810 err_free:
811 kfree(sport);
812 return ret;
813 }
814
815 static int serial_pxa_remove(struct platform_device *dev)
816 {
817 struct uart_pxa_port *sport = platform_get_drvdata(dev);
818
819 platform_set_drvdata(dev, NULL);
820
821 uart_remove_one_port(&serial_pxa_reg, &sport->port);
822 clk_put(sport->clk);
823 kfree(sport);
824
825 return 0;
826 }
827
828 static struct platform_driver serial_pxa_driver = {
829 .probe = serial_pxa_probe,
830 .remove = serial_pxa_remove,
831
832 .suspend = serial_pxa_suspend,
833 .resume = serial_pxa_resume,
834 .driver = {
835 .name = "pxa2xx-uart",
836 .owner = THIS_MODULE,
837 },
838 };
839
840 int __init serial_pxa_init(void)
841 {
842 int ret;
843
844 ret = uart_register_driver(&serial_pxa_reg);
845 if (ret != 0)
846 return ret;
847
848 ret = platform_driver_register(&serial_pxa_driver);
849 if (ret != 0)
850 uart_unregister_driver(&serial_pxa_reg);
851
852 return ret;
853 }
854
855 void __exit serial_pxa_exit(void)
856 {
857 platform_driver_unregister(&serial_pxa_driver);
858 uart_unregister_driver(&serial_pxa_reg);
859 }
860
861 module_init(serial_pxa_init);
862 module_exit(serial_pxa_exit);
863
864 MODULE_LICENSE("GPL");
865 MODULE_ALIAS("platform:pxa2xx-uart");
Support for the Chinese Samsung S3C2440 based development boards