]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame_incremental - drivers/serial/pxa.c
projects / mirror_ubuntu-artful-kernel.git / blame_incremental
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (non-incremental) | history | HEAD
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
[mirror_ubuntu-artful-kernel.git] / drivers / serial / pxa.c
... / ...
CommitLineData
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
46#include <asm/io.h>
47#include <asm/hardware.h>
48#include <asm/irq.h>
49#include <asm/arch/pxa-regs.h>
50
51
52struct uart_pxa_port {
53 struct uart_port port;
54 unsigned char ier;
55 unsigned char lcr;
56 unsigned char mcr;
57 unsigned int lsr_break_flag;
58 unsigned int cken;
59 char *name;
60};
61
62static inline unsigned int serial_in(struct uart_pxa_port *up, int offset)
63{
64 offset <<= 2;
65 return readl(up->port.membase + offset);
66}
67
68static inline void serial_out(struct uart_pxa_port *up, int offset, int value)
69{
70 offset <<= 2;
71 writel(value, up->port.membase + offset);
72}
73
74static void serial_pxa_enable_ms(struct uart_port *port)
75{
76 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
77
78 up->ier |= UART_IER_MSI;
79 serial_out(up, UART_IER, up->ier);
80}
81
82static void serial_pxa_stop_tx(struct uart_port *port)
83{
84 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
85
86 if (up->ier & UART_IER_THRI) {
87 up->ier &= ~UART_IER_THRI;
88 serial_out(up, UART_IER, up->ier);
89 }
90}
91
92static void serial_pxa_stop_rx(struct uart_port *port)
93{
94 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
95
96 up->ier &= ~UART_IER_RLSI;
97 up->port.read_status_mask &= ~UART_LSR_DR;
98 serial_out(up, UART_IER, up->ier);
99}
100
101static inline void receive_chars(struct uart_pxa_port *up, int *status)
102{
103 struct tty_struct *tty = up->port.info->tty;
104 unsigned int ch, flag;
105 int max_count = 256;
106
107 do {
108 ch = serial_in(up, UART_RX);
109 flag = TTY_NORMAL;
110 up->port.icount.rx++;
111
112 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
113 UART_LSR_FE | UART_LSR_OE))) {
114 /*
115 * For statistics only
116 */
117 if (*status & UART_LSR_BI) {
118 *status &= ~(UART_LSR_FE | UART_LSR_PE);
119 up->port.icount.brk++;
120 /*
121 * We do the SysRQ and SAK checking
122 * here because otherwise the break
123 * may get masked by ignore_status_mask
124 * or read_status_mask.
125 */
126 if (uart_handle_break(&up->port))
127 goto ignore_char;
128 } else if (*status & UART_LSR_PE)
129 up->port.icount.parity++;
130 else if (*status & UART_LSR_FE)
131 up->port.icount.frame++;
132 if (*status & UART_LSR_OE)
133 up->port.icount.overrun++;
134
135 /*
136 * Mask off conditions which should be ignored.
137 */
138 *status &= up->port.read_status_mask;
139
140#ifdef CONFIG_SERIAL_PXA_CONSOLE
141 if (up->port.line == up->port.cons->index) {
142 /* Recover the break flag from console xmit */
143 *status |= up->lsr_break_flag;
144 up->lsr_break_flag = 0;
145 }
146#endif
147 if (*status & UART_LSR_BI) {
148 flag = TTY_BREAK;
149 } else if (*status & UART_LSR_PE)
150 flag = TTY_PARITY;
151 else if (*status & UART_LSR_FE)
152 flag = TTY_FRAME;
153 }
154
155 if (uart_handle_sysrq_char(&up->port, ch))
156 goto ignore_char;
157
158 uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag);
159
160 ignore_char:
161 *status = serial_in(up, UART_LSR);
162 } while ((*status & UART_LSR_DR) && (max_count-- > 0));
163 tty_flip_buffer_push(tty);
164}
165
166static void transmit_chars(struct uart_pxa_port *up)
167{
168 struct circ_buf *xmit = &up->port.info->xmit;
169 int count;
170
171 if (up->port.x_char) {
172 serial_out(up, UART_TX, up->port.x_char);
173 up->port.icount.tx++;
174 up->port.x_char = 0;
175 return;
176 }
177 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
178 serial_pxa_stop_tx(&up->port);
179 return;
180 }
181
182 count = up->port.fifosize / 2;
183 do {
184 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
185 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
186 up->port.icount.tx++;
187 if (uart_circ_empty(xmit))
188 break;
189 } while (--count > 0);
190
191 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
192 uart_write_wakeup(&up->port);
193
194
195 if (uart_circ_empty(xmit))
196 serial_pxa_stop_tx(&up->port);
197}
198
199static void serial_pxa_start_tx(struct uart_port *port)
200{
201 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
202
203 if (!(up->ier & UART_IER_THRI)) {
204 up->ier |= UART_IER_THRI;
205 serial_out(up, UART_IER, up->ier);
206 }
207}
208
209static inline void check_modem_status(struct uart_pxa_port *up)
210{
211 int status;
212
213 status = serial_in(up, UART_MSR);
214
215 if ((status & UART_MSR_ANY_DELTA) == 0)
216 return;
217
218 if (status & UART_MSR_TERI)
219 up->port.icount.rng++;
220 if (status & UART_MSR_DDSR)
221 up->port.icount.dsr++;
222 if (status & UART_MSR_DDCD)
223 uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
224 if (status & UART_MSR_DCTS)
225 uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
226
227 wake_up_interruptible(&up->port.info->delta_msr_wait);
228}
229
230/*
231 * This handles the interrupt from one port.
232 */
233static inline irqreturn_t serial_pxa_irq(int irq, void *dev_id)
234{
235 struct uart_pxa_port *up = (struct uart_pxa_port *)dev_id;
236 unsigned int iir, lsr;
237
238 iir = serial_in(up, UART_IIR);
239 if (iir & UART_IIR_NO_INT)
240 return IRQ_NONE;
241 lsr = serial_in(up, UART_LSR);
242 if (lsr & UART_LSR_DR)
243 receive_chars(up, &lsr);
244 check_modem_status(up);
245 if (lsr & UART_LSR_THRE)
246 transmit_chars(up);
247 return IRQ_HANDLED;
248}
249
250static unsigned int serial_pxa_tx_empty(struct uart_port *port)
251{
252 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
253 unsigned long flags;
254 unsigned int ret;
255
256 spin_lock_irqsave(&up->port.lock, flags);
257 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
258 spin_unlock_irqrestore(&up->port.lock, flags);
259
260 return ret;
261}
262
263static unsigned int serial_pxa_get_mctrl(struct uart_port *port)
264{
265 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
266 unsigned char status;
267 unsigned int ret;
268
269 status = serial_in(up, UART_MSR);
270
271 ret = 0;
272 if (status & UART_MSR_DCD)
273 ret |= TIOCM_CAR;
274 if (status & UART_MSR_RI)
275 ret |= TIOCM_RNG;
276 if (status & UART_MSR_DSR)
277 ret |= TIOCM_DSR;
278 if (status & UART_MSR_CTS)
279 ret |= TIOCM_CTS;
280 return ret;
281}
282
283static void serial_pxa_set_mctrl(struct uart_port *port, unsigned int mctrl)
284{
285 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
286 unsigned char mcr = 0;
287
288 if (mctrl & TIOCM_RTS)
289 mcr |= UART_MCR_RTS;
290 if (mctrl & TIOCM_DTR)
291 mcr |= UART_MCR_DTR;
292 if (mctrl & TIOCM_OUT1)
293 mcr |= UART_MCR_OUT1;
294 if (mctrl & TIOCM_OUT2)
295 mcr |= UART_MCR_OUT2;
296 if (mctrl & TIOCM_LOOP)
297 mcr |= UART_MCR_LOOP;
298
299 mcr |= up->mcr;
300
301 serial_out(up, UART_MCR, mcr);
302}
303
304static void serial_pxa_break_ctl(struct uart_port *port, int break_state)
305{
306 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
307 unsigned long flags;
308
309 spin_lock_irqsave(&up->port.lock, flags);
310 if (break_state == -1)
311 up->lcr |= UART_LCR_SBC;
312 else
313 up->lcr &= ~UART_LCR_SBC;
314 serial_out(up, UART_LCR, up->lcr);
315 spin_unlock_irqrestore(&up->port.lock, flags);
316}
317
318#if 0
319static void serial_pxa_dma_init(struct pxa_uart *up)
320{
321 up->rxdma =
322 pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_receive_dma, up);
323 if (up->rxdma < 0)
324 goto out;
325 up->txdma =
326 pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_transmit_dma, up);
327 if (up->txdma < 0)
328 goto err_txdma;
329 up->dmadesc = kmalloc(4 * sizeof(pxa_dma_desc), GFP_KERNEL);
330 if (!up->dmadesc)
331 goto err_alloc;
332
333 /* ... */
334err_alloc:
335 pxa_free_dma(up->txdma);
336err_rxdma:
337 pxa_free_dma(up->rxdma);
338out:
339 return;
340}
341#endif
342
343static int serial_pxa_startup(struct uart_port *port)
344{
345 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
346 unsigned long flags;
347 int retval;
348
349 if (port->line == 3) /* HWUART */
350 up->mcr |= UART_MCR_AFE;
351 else
352 up->mcr = 0;
353
354 /*
355 * Allocate the IRQ
356 */
357 retval = request_irq(up->port.irq, serial_pxa_irq, 0, up->name, up);
358 if (retval)
359 return retval;
360
361 /*
362 * Clear the FIFO buffers and disable them.
363 * (they will be reenabled in set_termios())
364 */
365 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
366 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
367 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
368 serial_out(up, UART_FCR, 0);
369
370 /*
371 * Clear the interrupt registers.
372 */
373 (void) serial_in(up, UART_LSR);
374 (void) serial_in(up, UART_RX);
375 (void) serial_in(up, UART_IIR);
376 (void) serial_in(up, UART_MSR);
377
378 /*
379 * Now, initialize the UART
380 */
381 serial_out(up, UART_LCR, UART_LCR_WLEN8);
382
383 spin_lock_irqsave(&up->port.lock, flags);
384 up->port.mctrl |= TIOCM_OUT2;
385 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
386 spin_unlock_irqrestore(&up->port.lock, flags);
387
388 /*
389 * Finally, enable interrupts. Note: Modem status interrupts
390 * are set via set_termios(), which will be occurring imminently
391 * anyway, so we don't enable them here.
392 */
393 up->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE;
394 serial_out(up, UART_IER, up->ier);
395
396 /*
397 * And clear the interrupt registers again for luck.
398 */
399 (void) serial_in(up, UART_LSR);
400 (void) serial_in(up, UART_RX);
401 (void) serial_in(up, UART_IIR);
402 (void) serial_in(up, UART_MSR);
403
404 return 0;
405}
406
407static void serial_pxa_shutdown(struct uart_port *port)
408{
409 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
410 unsigned long flags;
411
412 free_irq(up->port.irq, up);
413
414 /*
415 * Disable interrupts from this port
416 */
417 up->ier = 0;
418 serial_out(up, UART_IER, 0);
419
420 spin_lock_irqsave(&up->port.lock, flags);
421 up->port.mctrl &= ~TIOCM_OUT2;
422 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
423 spin_unlock_irqrestore(&up->port.lock, flags);
424
425 /*
426 * Disable break condition and FIFOs
427 */
428 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
429 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
430 UART_FCR_CLEAR_RCVR |
431 UART_FCR_CLEAR_XMIT);
432 serial_out(up, UART_FCR, 0);
433}
434
435static void
436serial_pxa_set_termios(struct uart_port *port, struct termios *termios,
437 struct termios *old)
438{
439 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
440 unsigned char cval, fcr = 0;
441 unsigned long flags;
442 unsigned int baud, quot;
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 |= 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 serial_out(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
535 serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */
536 serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */
537 serial_out(up, UART_LCR, cval); /* reset DLAB */
538 up->lcr = cval; /* Save LCR */
539 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
540 serial_out(up, UART_FCR, fcr);
541 spin_unlock_irqrestore(&up->port.lock, flags);
542}
543
544static void
545serial_pxa_pm(struct uart_port *port, unsigned int state,
546 unsigned int oldstate)
547{
548 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
549 pxa_set_cken(up->cken, !state);
550 if (!state)
551 udelay(1);
552}
553
554static void serial_pxa_release_port(struct uart_port *port)
555{
556}
557
558static int serial_pxa_request_port(struct uart_port *port)
559{
560 return 0;
561}
562
563static void serial_pxa_config_port(struct uart_port *port, int flags)
564{
565 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
566 up->port.type = PORT_PXA;
567}
568
569static int
570serial_pxa_verify_port(struct uart_port *port, struct serial_struct *ser)
571{
572 /* we don't want the core code to modify any port params */
573 return -EINVAL;
574}
575
576static const char *
577serial_pxa_type(struct uart_port *port)
578{
579 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
580 return up->name;
581}
582
583#ifdef CONFIG_SERIAL_PXA_CONSOLE
584
585static struct uart_pxa_port serial_pxa_ports[];
586static struct uart_driver serial_pxa_reg;
587
588#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
589
590/*
591 * Wait for transmitter & holding register to empty
592 */
593static inline void wait_for_xmitr(struct uart_pxa_port *up)
594{
595 unsigned int status, tmout = 10000;
596
597 /* Wait up to 10ms for the character(s) to be sent. */
598 do {
599 status = serial_in(up, UART_LSR);
600
601 if (status & UART_LSR_BI)
602 up->lsr_break_flag = UART_LSR_BI;
603
604 if (--tmout == 0)
605 break;
606 udelay(1);
607 } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
608
609 /* Wait up to 1s for flow control if necessary */
610 if (up->port.flags & UPF_CONS_FLOW) {
611 tmout = 1000000;
612 while (--tmout &&
613 ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
614 udelay(1);
615 }
616}
617
618static void serial_pxa_console_putchar(struct uart_port *port, int ch)
619{
620 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
621
622 wait_for_xmitr(up);
623 serial_out(up, UART_TX, ch);
624}
625
626/*
627 * Print a string to the serial port trying not to disturb
628 * any possible real use of the port...
629 *
630 * The console_lock must be held when we get here.
631 */
632static void
633serial_pxa_console_write(struct console *co, const char *s, unsigned int count)
634{
635 struct uart_pxa_port *up = &serial_pxa_ports[co->index];
636 unsigned int ier;
637
638 /*
639 * First save the IER then disable the interrupts
640 */
641 ier = serial_in(up, UART_IER);
642 serial_out(up, UART_IER, UART_IER_UUE);
643
644 uart_console_write(&up->port, s, count, serial_pxa_console_putchar);
645
646 /*
647 * Finally, wait for transmitter to become empty
648 * and restore the IER
649 */
650 wait_for_xmitr(up);
651 serial_out(up, UART_IER, ier);
652}
653
654static int __init
655serial_pxa_console_setup(struct console *co, char *options)
656{
657 struct uart_pxa_port *up;
658 int baud = 9600;
659 int bits = 8;
660 int parity = 'n';
661 int flow = 'n';
662
663 if (co->index == -1 || co->index >= serial_pxa_reg.nr)
664 co->index = 0;
665 up = &serial_pxa_ports[co->index];
666
667 if (options)
668 uart_parse_options(options, &baud, &parity, &bits, &flow);
669
670 return uart_set_options(&up->port, co, baud, parity, bits, flow);
671}
672
673static struct console serial_pxa_console = {
674 .name = "ttyS",
675 .write = serial_pxa_console_write,
676 .device = uart_console_device,
677 .setup = serial_pxa_console_setup,
678 .flags = CON_PRINTBUFFER,
679 .index = -1,
680 .data = &serial_pxa_reg,
681};
682
683static int __init
684serial_pxa_console_init(void)
685{
686 register_console(&serial_pxa_console);
687 return 0;
688}
689
690console_initcall(serial_pxa_console_init);
691
692#define PXA_CONSOLE &serial_pxa_console
693#else
694#define PXA_CONSOLE NULL
695#endif
696
697struct uart_ops serial_pxa_pops = {
698 .tx_empty = serial_pxa_tx_empty,
699 .set_mctrl = serial_pxa_set_mctrl,
700 .get_mctrl = serial_pxa_get_mctrl,
701 .stop_tx = serial_pxa_stop_tx,
702 .start_tx = serial_pxa_start_tx,
703 .stop_rx = serial_pxa_stop_rx,
704 .enable_ms = serial_pxa_enable_ms,
705 .break_ctl = serial_pxa_break_ctl,
706 .startup = serial_pxa_startup,
707 .shutdown = serial_pxa_shutdown,
708 .set_termios = serial_pxa_set_termios,
709 .pm = serial_pxa_pm,
710 .type = serial_pxa_type,
711 .release_port = serial_pxa_release_port,
712 .request_port = serial_pxa_request_port,
713 .config_port = serial_pxa_config_port,
714 .verify_port = serial_pxa_verify_port,
715};
716
717static struct uart_pxa_port serial_pxa_ports[] = {
718 { /* FFUART */
719 .name = "FFUART",
720 .cken = CKEN6_FFUART,
721 .port = {
722 .type = PORT_PXA,
723 .iotype = UPIO_MEM,
724 .membase = (void *)&FFUART,
725 .mapbase = __PREG(FFUART),
726 .irq = IRQ_FFUART,
727 .uartclk = 921600 * 16,
728 .fifosize = 64,
729 .ops = &serial_pxa_pops,
730 .line = 0,
731 },
732 }, { /* BTUART */
733 .name = "BTUART",
734 .cken = CKEN7_BTUART,
735 .port = {
736 .type = PORT_PXA,
737 .iotype = UPIO_MEM,
738 .membase = (void *)&BTUART,
739 .mapbase = __PREG(BTUART),
740 .irq = IRQ_BTUART,
741 .uartclk = 921600 * 16,
742 .fifosize = 64,
743 .ops = &serial_pxa_pops,
744 .line = 1,
745 },
746 }, { /* STUART */
747 .name = "STUART",
748 .cken = CKEN5_STUART,
749 .port = {
750 .type = PORT_PXA,
751 .iotype = UPIO_MEM,
752 .membase = (void *)&STUART,
753 .mapbase = __PREG(STUART),
754 .irq = IRQ_STUART,
755 .uartclk = 921600 * 16,
756 .fifosize = 64,
757 .ops = &serial_pxa_pops,
758 .line = 2,
759 },
760 }, { /* HWUART */
761 .name = "HWUART",
762 .cken = CKEN4_HWUART,
763 .port = {
764 .type = PORT_PXA,
765 .iotype = UPIO_MEM,
766 .membase = (void *)&HWUART,
767 .mapbase = __PREG(HWUART),
768 .irq = IRQ_HWUART,
769 .uartclk = 921600 * 16,
770 .fifosize = 64,
771 .ops = &serial_pxa_pops,
772 .line = 3,
773 },
774 }
775};
776
777static struct uart_driver serial_pxa_reg = {
778 .owner = THIS_MODULE,
779 .driver_name = "PXA serial",
780 .dev_name = "ttyS",
781 .major = TTY_MAJOR,
782 .minor = 64,
783 .nr = ARRAY_SIZE(serial_pxa_ports),
784 .cons = PXA_CONSOLE,
785};
786
787static int serial_pxa_suspend(struct platform_device *dev, pm_message_t state)
788{
789 struct uart_pxa_port *sport = platform_get_drvdata(dev);
790
791 if (sport)
792 uart_suspend_port(&serial_pxa_reg, &sport->port);
793
794 return 0;
795}
796
797static int serial_pxa_resume(struct platform_device *dev)
798{
799 struct uart_pxa_port *sport = platform_get_drvdata(dev);
800
801 if (sport)
802 uart_resume_port(&serial_pxa_reg, &sport->port);
803
804 return 0;
805}
806
807static int serial_pxa_probe(struct platform_device *dev)
808{
809 serial_pxa_ports[dev->id].port.dev = &dev->dev;
810 uart_add_one_port(&serial_pxa_reg, &serial_pxa_ports[dev->id].port);
811 platform_set_drvdata(dev, &serial_pxa_ports[dev->id]);
812 return 0;
813}
814
815static 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 if (sport)
822 uart_remove_one_port(&serial_pxa_reg, &sport->port);
823
824 return 0;
825}
826
827static struct platform_driver serial_pxa_driver = {
828 .probe = serial_pxa_probe,
829 .remove = serial_pxa_remove,
830
831 .suspend = serial_pxa_suspend,
832 .resume = serial_pxa_resume,
833 .driver = {
834 .name = "pxa2xx-uart",
835 },
836};
837
838int __init serial_pxa_init(void)
839{
840 int ret;
841
842 ret = uart_register_driver(&serial_pxa_reg);
843 if (ret != 0)
844 return ret;
845
846 ret = platform_driver_register(&serial_pxa_driver);
847 if (ret != 0)
848 uart_unregister_driver(&serial_pxa_reg);
849
850 return ret;
851}
852
853void __exit serial_pxa_exit(void)
854{
855 platform_driver_unregister(&serial_pxa_driver);
856 uart_unregister_driver(&serial_pxa_reg);
857}
858
859module_init(serial_pxa_init);
860module_exit(serial_pxa_exit);
861
862MODULE_LICENSE("GPL");
863
Ubuntu Artful kernel mirror