tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * linux/drivers/char/amba.c
3 *
4 * Driver for AMBA serial ports
5 *
6 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
7 *
8 * Copyright 1999 ARM Limited
9 * Copyright (C) 2000 Deep Blue Solutions Ltd.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 *
25 * This is a generic driver for ARM AMBA-type serial ports. They
26 * have a lot of 16550-like features, but are not register compatible.
27 * Note that although they do have CTS, DCD and DSR inputs, they do
28 * not have an RI input, nor do they have DTR or RTS outputs. If
29 * required, these have to be supplied via some other means (eg, GPIO)
30 * and hooked into this driver.
31 */
32
33#if defined(CONFIG_SERIAL_AMBA_PL010_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
34#define SUPPORT_SYSRQ
35#endif
36
37#include <linux/module.h>
38#include <linux/ioport.h>
39#include <linux/init.h>
40#include <linux/console.h>
41#include <linux/sysrq.h>
42#include <linux/device.h>
43#include <linux/tty.h>
44#include <linux/tty_flip.h>
45#include <linux/serial_core.h>
46#include <linux/serial.h>
47#include <linux/amba/bus.h>
48#include <linux/amba/serial.h>
49#include <linux/clk.h>
50
51#include <asm/io.h>
52
53#define UART_NR 8
54
55#define SERIAL_AMBA_MAJOR 204
56#define SERIAL_AMBA_MINOR 16
57#define SERIAL_AMBA_NR UART_NR
58
59#define AMBA_ISR_PASS_LIMIT 256
60
61#define UART_RX_DATA(s) (((s) & UART01x_FR_RXFE) == 0)
62#define UART_TX_READY(s) (((s) & UART01x_FR_TXFF) == 0)
63
64#define UART_DUMMY_RSR_RX 256
65#define UART_PORT_SIZE 64
66
67/*
68 * We wrap our port structure around the generic uart_port.
69 */
70struct uart_amba_port {
71 struct uart_port port;
72 struct clk *clk;
73 struct amba_device *dev;
74 struct amba_pl010_data *data;
75 unsigned int old_status;
76};
77
78static void pl010_stop_tx(struct uart_port *port)
79{
80 struct uart_amba_port *uap = (struct uart_amba_port *)port;
81 unsigned int cr;
82
83 cr = readb(uap->port.membase + UART010_CR);
84 cr &= ~UART010_CR_TIE;
85 writel(cr, uap->port.membase + UART010_CR);
86}
87
88static void pl010_start_tx(struct uart_port *port)
89{
90 struct uart_amba_port *uap = (struct uart_amba_port *)port;
91 unsigned int cr;
92
93 cr = readb(uap->port.membase + UART010_CR);
94 cr |= UART010_CR_TIE;
95 writel(cr, uap->port.membase + UART010_CR);
96}
97
98static void pl010_stop_rx(struct uart_port *port)
99{
100 struct uart_amba_port *uap = (struct uart_amba_port *)port;
101 unsigned int cr;
102
103 cr = readb(uap->port.membase + UART010_CR);
104 cr &= ~(UART010_CR_RIE | UART010_CR_RTIE);
105 writel(cr, uap->port.membase + UART010_CR);
106}
107
108static void pl010_enable_ms(struct uart_port *port)
109{
110 struct uart_amba_port *uap = (struct uart_amba_port *)port;
111 unsigned int cr;
112
113 cr = readb(uap->port.membase + UART010_CR);
114 cr |= UART010_CR_MSIE;
115 writel(cr, uap->port.membase + UART010_CR);
116}
117
118static void pl010_rx_chars(struct uart_amba_port *uap)
119{
120 struct tty_struct *tty = uap->port.info->port.tty;
121 unsigned int status, ch, flag, rsr, max_count = 256;
122
123 status = readb(uap->port.membase + UART01x_FR);
124 while (UART_RX_DATA(status) && max_count--) {
125 ch = readb(uap->port.membase + UART01x_DR);
126 flag = TTY_NORMAL;
127
128 uap->port.icount.rx++;
129
130 /*
131 * Note that the error handling code is
132 * out of the main execution path
133 */
134 rsr = readb(uap->port.membase + UART01x_RSR) | UART_DUMMY_RSR_RX;
135 if (unlikely(rsr & UART01x_RSR_ANY)) {
136 writel(0, uap->port.membase + UART01x_ECR);
137
138 if (rsr & UART01x_RSR_BE) {
139 rsr &= ~(UART01x_RSR_FE | UART01x_RSR_PE);
140 uap->port.icount.brk++;
141 if (uart_handle_break(&uap->port))
142 goto ignore_char;
143 } else if (rsr & UART01x_RSR_PE)
144 uap->port.icount.parity++;
145 else if (rsr & UART01x_RSR_FE)
146 uap->port.icount.frame++;
147 if (rsr & UART01x_RSR_OE)
148 uap->port.icount.overrun++;
149
150 rsr &= uap->port.read_status_mask;
151
152 if (rsr & UART01x_RSR_BE)
153 flag = TTY_BREAK;
154 else if (rsr & UART01x_RSR_PE)
155 flag = TTY_PARITY;
156 else if (rsr & UART01x_RSR_FE)
157 flag = TTY_FRAME;
158 }
159
160 if (uart_handle_sysrq_char(&uap->port, ch))
161 goto ignore_char;
162
163 uart_insert_char(&uap->port, rsr, UART01x_RSR_OE, ch, flag);
164
165 ignore_char:
166 status = readb(uap->port.membase + UART01x_FR);
167 }
168 spin_unlock(&uap->port.lock);
169 tty_flip_buffer_push(tty);
170 spin_lock(&uap->port.lock);
171}
172
173static void pl010_tx_chars(struct uart_amba_port *uap)
174{
175 struct circ_buf *xmit = &uap->port.info->xmit;
176 int count;
177
178 if (uap->port.x_char) {
179 writel(uap->port.x_char, uap->port.membase + UART01x_DR);
180 uap->port.icount.tx++;
181 uap->port.x_char = 0;
182 return;
183 }
184 if (uart_circ_empty(xmit) || uart_tx_stopped(&uap->port)) {
185 pl010_stop_tx(&uap->port);
186 return;
187 }
188
189 count = uap->port.fifosize >> 1;
190 do {
191 writel(xmit->buf[xmit->tail], uap->port.membase + UART01x_DR);
192 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
193 uap->port.icount.tx++;
194 if (uart_circ_empty(xmit))
195 break;
196 } while (--count > 0);
197
198 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
199 uart_write_wakeup(&uap->port);
200
201 if (uart_circ_empty(xmit))
202 pl010_stop_tx(&uap->port);
203}
204
205static void pl010_modem_status(struct uart_amba_port *uap)
206{
207 unsigned int status, delta;
208
209 writel(0, uap->port.membase + UART010_ICR);
210
211 status = readb(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
212
213 delta = status ^ uap->old_status;
214 uap->old_status = status;
215
216 if (!delta)
217 return;
218
219 if (delta & UART01x_FR_DCD)
220 uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD);
221
222 if (delta & UART01x_FR_DSR)
223 uap->port.icount.dsr++;
224
225 if (delta & UART01x_FR_CTS)
226 uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS);
227
228 wake_up_interruptible(&uap->port.info->delta_msr_wait);
229}
230
231static irqreturn_t pl010_int(int irq, void *dev_id)
232{
233 struct uart_amba_port *uap = dev_id;
234 unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
235 int handled = 0;
236
237 spin_lock(&uap->port.lock);
238
239 status = readb(uap->port.membase + UART010_IIR);
240 if (status) {
241 do {
242 if (status & (UART010_IIR_RTIS | UART010_IIR_RIS))
243 pl010_rx_chars(uap);
244 if (status & UART010_IIR_MIS)
245 pl010_modem_status(uap);
246 if (status & UART010_IIR_TIS)
247 pl010_tx_chars(uap);
248
249 if (pass_counter-- == 0)
250 break;
251
252 status = readb(uap->port.membase + UART010_IIR);
253 } while (status & (UART010_IIR_RTIS | UART010_IIR_RIS |
254 UART010_IIR_TIS));
255 handled = 1;
256 }
257
258 spin_unlock(&uap->port.lock);
259
260 return IRQ_RETVAL(handled);
261}
262
263static unsigned int pl010_tx_empty(struct uart_port *port)
264{
265 struct uart_amba_port *uap = (struct uart_amba_port *)port;
266 unsigned int status = readb(uap->port.membase + UART01x_FR);
267 return status & UART01x_FR_BUSY ? 0 : TIOCSER_TEMT;
268}
269
270static unsigned int pl010_get_mctrl(struct uart_port *port)
271{
272 struct uart_amba_port *uap = (struct uart_amba_port *)port;
273 unsigned int result = 0;
274 unsigned int status;
275
276 status = readb(uap->port.membase + UART01x_FR);
277 if (status & UART01x_FR_DCD)
278 result |= TIOCM_CAR;
279 if (status & UART01x_FR_DSR)
280 result |= TIOCM_DSR;
281 if (status & UART01x_FR_CTS)
282 result |= TIOCM_CTS;
283
284 return result;
285}
286
287static void pl010_set_mctrl(struct uart_port *port, unsigned int mctrl)
288{
289 struct uart_amba_port *uap = (struct uart_amba_port *)port;
290
291 if (uap->data)
292 uap->data->set_mctrl(uap->dev, uap->port.membase, mctrl);
293}
294
295static void pl010_break_ctl(struct uart_port *port, int break_state)
296{
297 struct uart_amba_port *uap = (struct uart_amba_port *)port;
298 unsigned long flags;
299 unsigned int lcr_h;
300
301 spin_lock_irqsave(&uap->port.lock, flags);
302 lcr_h = readb(uap->port.membase + UART010_LCRH);
303 if (break_state == -1)
304 lcr_h |= UART01x_LCRH_BRK;
305 else
306 lcr_h &= ~UART01x_LCRH_BRK;
307 writel(lcr_h, uap->port.membase + UART010_LCRH);
308 spin_unlock_irqrestore(&uap->port.lock, flags);
309}
310
311static int pl010_startup(struct uart_port *port)
312{
313 struct uart_amba_port *uap = (struct uart_amba_port *)port;
314 int retval;
315
316 /*
317 * Try to enable the clock producer.
318 */
319 retval = clk_enable(uap->clk);
320 if (retval)
321 goto out;
322
323 uap->port.uartclk = clk_get_rate(uap->clk);
324
325 /*
326 * Allocate the IRQ
327 */
328 retval = request_irq(uap->port.irq, pl010_int, 0, "uart-pl010", uap);
329 if (retval)
330 goto clk_dis;
331
332 /*
333 * initialise the old status of the modem signals
334 */
335 uap->old_status = readb(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
336
337 /*
338 * Finally, enable interrupts
339 */
340 writel(UART01x_CR_UARTEN | UART010_CR_RIE | UART010_CR_RTIE,
341 uap->port.membase + UART010_CR);
342
343 return 0;
344
345 clk_dis:
346 clk_disable(uap->clk);
347 out:
348 return retval;
349}
350
351static void pl010_shutdown(struct uart_port *port)
352{
353 struct uart_amba_port *uap = (struct uart_amba_port *)port;
354
355 /*
356 * Free the interrupt
357 */
358 free_irq(uap->port.irq, uap);
359
360 /*
361 * disable all interrupts, disable the port
362 */
363 writel(0, uap->port.membase + UART010_CR);
364
365 /* disable break condition and fifos */
366 writel(readb(uap->port.membase + UART010_LCRH) &
367 ~(UART01x_LCRH_BRK | UART01x_LCRH_FEN),
368 uap->port.membase + UART010_LCRH);
369
370 /*
371 * Shut down the clock producer
372 */
373 clk_disable(uap->clk);
374}
375
376static void
377pl010_set_termios(struct uart_port *port, struct ktermios *termios,
378 struct ktermios *old)
379{
380 struct uart_amba_port *uap = (struct uart_amba_port *)port;
381 unsigned int lcr_h, old_cr;
382 unsigned long flags;
383 unsigned int baud, quot;
384
385 /*
386 * Ask the core to calculate the divisor for us.
387 */
388 baud = uart_get_baud_rate(port, termios, old, 0, uap->port.uartclk/16);
389 quot = uart_get_divisor(port, baud);
390
391 switch (termios->c_cflag & CSIZE) {
392 case CS5:
393 lcr_h = UART01x_LCRH_WLEN_5;
394 break;
395 case CS6:
396 lcr_h = UART01x_LCRH_WLEN_6;
397 break;
398 case CS7:
399 lcr_h = UART01x_LCRH_WLEN_7;
400 break;
401 default: // CS8
402 lcr_h = UART01x_LCRH_WLEN_8;
403 break;
404 }
405 if (termios->c_cflag & CSTOPB)
406 lcr_h |= UART01x_LCRH_STP2;
407 if (termios->c_cflag & PARENB) {
408 lcr_h |= UART01x_LCRH_PEN;
409 if (!(termios->c_cflag & PARODD))
410 lcr_h |= UART01x_LCRH_EPS;
411 }
412 if (uap->port.fifosize > 1)
413 lcr_h |= UART01x_LCRH_FEN;
414
415 spin_lock_irqsave(&uap->port.lock, flags);
416
417 /*
418 * Update the per-port timeout.
419 */
420 uart_update_timeout(port, termios->c_cflag, baud);
421
422 uap->port.read_status_mask = UART01x_RSR_OE;
423 if (termios->c_iflag & INPCK)
424 uap->port.read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
425 if (termios->c_iflag & (BRKINT | PARMRK))
426 uap->port.read_status_mask |= UART01x_RSR_BE;
427
428 /*
429 * Characters to ignore
430 */
431 uap->port.ignore_status_mask = 0;
432 if (termios->c_iflag & IGNPAR)
433 uap->port.ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
434 if (termios->c_iflag & IGNBRK) {
435 uap->port.ignore_status_mask |= UART01x_RSR_BE;
436 /*
437 * If we're ignoring parity and break indicators,
438 * ignore overruns too (for real raw support).
439 */
440 if (termios->c_iflag & IGNPAR)
441 uap->port.ignore_status_mask |= UART01x_RSR_OE;
442 }
443
444 /*
445 * Ignore all characters if CREAD is not set.
446 */
447 if ((termios->c_cflag & CREAD) == 0)
448 uap->port.ignore_status_mask |= UART_DUMMY_RSR_RX;
449
450 /* first, disable everything */
451 old_cr = readb(uap->port.membase + UART010_CR) & ~UART010_CR_MSIE;
452
453 if (UART_ENABLE_MS(port, termios->c_cflag))
454 old_cr |= UART010_CR_MSIE;
455
456 writel(0, uap->port.membase + UART010_CR);
457
458 /* Set baud rate */
459 quot -= 1;
460 writel((quot & 0xf00) >> 8, uap->port.membase + UART010_LCRM);
461 writel(quot & 0xff, uap->port.membase + UART010_LCRL);
462
463 /*
464 * ----------v----------v----------v----------v-----
465 * NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L
466 * ----------^----------^----------^----------^-----
467 */
468 writel(lcr_h, uap->port.membase + UART010_LCRH);
469 writel(old_cr, uap->port.membase + UART010_CR);
470
471 spin_unlock_irqrestore(&uap->port.lock, flags);
472}
473
474static const char *pl010_type(struct uart_port *port)
475{
476 return port->type == PORT_AMBA ? "AMBA" : NULL;
477}
478
479/*
480 * Release the memory region(s) being used by 'port'
481 */
482static void pl010_release_port(struct uart_port *port)
483{
484 release_mem_region(port->mapbase, UART_PORT_SIZE);
485}
486
487/*
488 * Request the memory region(s) being used by 'port'
489 */
490static int pl010_request_port(struct uart_port *port)
491{
492 return request_mem_region(port->mapbase, UART_PORT_SIZE, "uart-pl010")
493 != NULL ? 0 : -EBUSY;
494}
495
496/*
497 * Configure/autoconfigure the port.
498 */
499static void pl010_config_port(struct uart_port *port, int flags)
500{
501 if (flags & UART_CONFIG_TYPE) {
502 port->type = PORT_AMBA;
503 pl010_request_port(port);
504 }
505}
506
507/*
508 * verify the new serial_struct (for TIOCSSERIAL).
509 */
510static int pl010_verify_port(struct uart_port *port, struct serial_struct *ser)
511{
512 int ret = 0;
513 if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMBA)
514 ret = -EINVAL;
515 if (ser->irq < 0 || ser->irq >= nr_irqs)
516 ret = -EINVAL;
517 if (ser->baud_base < 9600)
518 ret = -EINVAL;
519 return ret;
520}
521
522static struct uart_ops amba_pl010_pops = {
523 .tx_empty = pl010_tx_empty,
524 .set_mctrl = pl010_set_mctrl,
525 .get_mctrl = pl010_get_mctrl,
526 .stop_tx = pl010_stop_tx,
527 .start_tx = pl010_start_tx,
528 .stop_rx = pl010_stop_rx,
529 .enable_ms = pl010_enable_ms,
530 .break_ctl = pl010_break_ctl,
531 .startup = pl010_startup,
532 .shutdown = pl010_shutdown,
533 .set_termios = pl010_set_termios,
534 .type = pl010_type,
535 .release_port = pl010_release_port,
536 .request_port = pl010_request_port,
537 .config_port = pl010_config_port,
538 .verify_port = pl010_verify_port,
539};
540
541static struct uart_amba_port *amba_ports[UART_NR];
542
543#ifdef CONFIG_SERIAL_AMBA_PL010_CONSOLE
544
545static void pl010_console_putchar(struct uart_port *port, int ch)
546{
547 struct uart_amba_port *uap = (struct uart_amba_port *)port;
548 unsigned int status;
549
550 do {
551 status = readb(uap->port.membase + UART01x_FR);
552 barrier();
553 } while (!UART_TX_READY(status));
554 writel(ch, uap->port.membase + UART01x_DR);
555}
556
557static void
558pl010_console_write(struct console *co, const char *s, unsigned int count)
559{
560 struct uart_amba_port *uap = amba_ports[co->index];
561 unsigned int status, old_cr;
562
563 clk_enable(uap->clk);
564
565 /*
566 * First save the CR then disable the interrupts
567 */
568 old_cr = readb(uap->port.membase + UART010_CR);
569 writel(UART01x_CR_UARTEN, uap->port.membase + UART010_CR);
570
571 uart_console_write(&uap->port, s, count, pl010_console_putchar);
572
573 /*
574 * Finally, wait for transmitter to become empty
575 * and restore the TCR
576 */
577 do {
578 status = readb(uap->port.membase + UART01x_FR);
579 barrier();
580 } while (status & UART01x_FR_BUSY);
581 writel(old_cr, uap->port.membase + UART010_CR);
582
583 clk_disable(uap->clk);
584}
585
586static void __init
587pl010_console_get_options(struct uart_amba_port *uap, int *baud,
588 int *parity, int *bits)
589{
590 if (readb(uap->port.membase + UART010_CR) & UART01x_CR_UARTEN) {
591 unsigned int lcr_h, quot;
592 lcr_h = readb(uap->port.membase + UART010_LCRH);
593
594 *parity = 'n';
595 if (lcr_h & UART01x_LCRH_PEN) {
596 if (lcr_h & UART01x_LCRH_EPS)
597 *parity = 'e';
598 else
599 *parity = 'o';
600 }
601
602 if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7)
603 *bits = 7;
604 else
605 *bits = 8;
606
607 quot = readb(uap->port.membase + UART010_LCRL) |
608 readb(uap->port.membase + UART010_LCRM) << 8;
609 *baud = uap->port.uartclk / (16 * (quot + 1));
610 }
611}
612
613static int __init pl010_console_setup(struct console *co, char *options)
614{
615 struct uart_amba_port *uap;
616 int baud = 38400;
617 int bits = 8;
618 int parity = 'n';
619 int flow = 'n';
620
621 /*
622 * Check whether an invalid uart number has been specified, and
623 * if so, search for the first available port that does have
624 * console support.
625 */
626 if (co->index >= UART_NR)
627 co->index = 0;
628 uap = amba_ports[co->index];
629 if (!uap)
630 return -ENODEV;
631
632 uap->port.uartclk = clk_get_rate(uap->clk);
633
634 if (options)
635 uart_parse_options(options, &baud, &parity, &bits, &flow);
636 else
637 pl010_console_get_options(uap, &baud, &parity, &bits);
638
639 return uart_set_options(&uap->port, co, baud, parity, bits, flow);
640}
641
642static struct uart_driver amba_reg;
643static struct console amba_console = {
644 .name = "ttyAM",
645 .write = pl010_console_write,
646 .device = uart_console_device,
647 .setup = pl010_console_setup,
648 .flags = CON_PRINTBUFFER,
649 .index = -1,
650 .data = &amba_reg,
651};
652
653#define AMBA_CONSOLE &amba_console
654#else
655#define AMBA_CONSOLE NULL
656#endif
657
658static struct uart_driver amba_reg = {
659 .owner = THIS_MODULE,
660 .driver_name = "ttyAM",
661 .dev_name = "ttyAM",
662 .major = SERIAL_AMBA_MAJOR,
663 .minor = SERIAL_AMBA_MINOR,
664 .nr = UART_NR,
665 .cons = AMBA_CONSOLE,
666};
667
668static int pl010_probe(struct amba_device *dev, void *id)
669{
670 struct uart_amba_port *uap;
671 void __iomem *base;
672 int i, ret;
673
674 for (i = 0; i < ARRAY_SIZE(amba_ports); i++)
675 if (amba_ports[i] == NULL)
676 break;
677
678 if (i == ARRAY_SIZE(amba_ports)) {
679 ret = -EBUSY;
680 goto out;
681 }
682
683 uap = kzalloc(sizeof(struct uart_amba_port), GFP_KERNEL);
684 if (!uap) {
685 ret = -ENOMEM;
686 goto out;
687 }
688
689 base = ioremap(dev->res.start, PAGE_SIZE);
690 if (!base) {
691 ret = -ENOMEM;
692 goto free;
693 }
694
695 uap->clk = clk_get(&dev->dev, NULL);
696 if (IS_ERR(uap->clk)) {
697 ret = PTR_ERR(uap->clk);
698 goto unmap;
699 }
700
701 uap->port.dev = &dev->dev;
702 uap->port.mapbase = dev->res.start;
703 uap->port.membase = base;
704 uap->port.iotype = UPIO_MEM;
705 uap->port.irq = dev->irq[0];
706 uap->port.fifosize = 16;
707 uap->port.ops = &amba_pl010_pops;
708 uap->port.flags = UPF_BOOT_AUTOCONF;
709 uap->port.line = i;
710 uap->dev = dev;
711 uap->data = dev->dev.platform_data;
712
713 amba_ports[i] = uap;
714
715 amba_set_drvdata(dev, uap);
716 ret = uart_add_one_port(&amba_reg, &uap->port);
717 if (ret) {
718 amba_set_drvdata(dev, NULL);
719 amba_ports[i] = NULL;
720 clk_put(uap->clk);
721 unmap:
722 iounmap(base);
723 free:
724 kfree(uap);
725 }
726 out:
727 return ret;
728}
729
730static int pl010_remove(struct amba_device *dev)
731{
732 struct uart_amba_port *uap = amba_get_drvdata(dev);
733 int i;
734
735 amba_set_drvdata(dev, NULL);
736
737 uart_remove_one_port(&amba_reg, &uap->port);
738
739 for (i = 0; i < ARRAY_SIZE(amba_ports); i++)
740 if (amba_ports[i] == uap)
741 amba_ports[i] = NULL;
742
743 iounmap(uap->port.membase);
744 clk_put(uap->clk);
745 kfree(uap);
746 return 0;
747}
748
749static int pl010_suspend(struct amba_device *dev, pm_message_t state)
750{
751 struct uart_amba_port *uap = amba_get_drvdata(dev);
752
753 if (uap)
754 uart_suspend_port(&amba_reg, &uap->port);
755
756 return 0;
757}
758
759static int pl010_resume(struct amba_device *dev)
760{
761 struct uart_amba_port *uap = amba_get_drvdata(dev);
762
763 if (uap)
764 uart_resume_port(&amba_reg, &uap->port);
765
766 return 0;
767}
768
769static struct amba_id pl010_ids[] __initdata = {
770 {
771 .id = 0x00041010,
772 .mask = 0x000fffff,
773 },
774 { 0, 0 },
775};
776
777static struct amba_driver pl010_driver = {
778 .drv = {
779 .name = "uart-pl010",
780 },
781 .id_table = pl010_ids,
782 .probe = pl010_probe,
783 .remove = pl010_remove,
784 .suspend = pl010_suspend,
785 .resume = pl010_resume,
786};
787
788static int __init pl010_init(void)
789{
790 int ret;
791
792 printk(KERN_INFO "Serial: AMBA driver\n");
793
794 ret = uart_register_driver(&amba_reg);
795 if (ret == 0) {
796 ret = amba_driver_register(&pl010_driver);
797 if (ret)
798 uart_unregister_driver(&amba_reg);
799 }
800 return ret;
801}
802
803static void __exit pl010_exit(void)
804{
805 amba_driver_unregister(&pl010_driver);
806 uart_unregister_driver(&amba_reg);
807}
808
809module_init(pl010_init);
810module_exit(pl010_exit);
811
812MODULE_AUTHOR("ARM Ltd/Deep Blue Solutions Ltd");
813MODULE_DESCRIPTION("ARM AMBA serial port driver");
814MODULE_LICENSE("GPL");