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drm/i915/ringbuffer: Write the value passed in to the tail register
[deliverable/linux.git] / drivers / serial / amba-pl010.c
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 #include <linux/slab.h>
51
52 #include <asm/io.h>
53
54 #define UART_NR 8
55
56 #define SERIAL_AMBA_MAJOR 204
57 #define SERIAL_AMBA_MINOR 16
58 #define SERIAL_AMBA_NR UART_NR
59
60 #define AMBA_ISR_PASS_LIMIT 256
61
62 #define UART_RX_DATA(s) (((s) & UART01x_FR_RXFE) == 0)
63 #define UART_TX_READY(s) (((s) & UART01x_FR_TXFF) == 0)
64
65 #define UART_DUMMY_RSR_RX 256
66 #define UART_PORT_SIZE 64
67
68 /*
69 * We wrap our port structure around the generic uart_port.
70 */
71 struct uart_amba_port {
72 struct uart_port port;
73 struct clk *clk;
74 struct amba_device *dev;
75 struct amba_pl010_data *data;
76 unsigned int old_status;
77 };
78
79 static void pl010_stop_tx(struct uart_port *port)
80 {
81 struct uart_amba_port *uap = (struct uart_amba_port *)port;
82 unsigned int cr;
83
84 cr = readb(uap->port.membase + UART010_CR);
85 cr &= ~UART010_CR_TIE;
86 writel(cr, uap->port.membase + UART010_CR);
87 }
88
89 static void pl010_start_tx(struct uart_port *port)
90 {
91 struct uart_amba_port *uap = (struct uart_amba_port *)port;
92 unsigned int cr;
93
94 cr = readb(uap->port.membase + UART010_CR);
95 cr |= UART010_CR_TIE;
96 writel(cr, uap->port.membase + UART010_CR);
97 }
98
99 static void pl010_stop_rx(struct uart_port *port)
100 {
101 struct uart_amba_port *uap = (struct uart_amba_port *)port;
102 unsigned int cr;
103
104 cr = readb(uap->port.membase + UART010_CR);
105 cr &= ~(UART010_CR_RIE | UART010_CR_RTIE);
106 writel(cr, uap->port.membase + UART010_CR);
107 }
108
109 static void pl010_enable_ms(struct uart_port *port)
110 {
111 struct uart_amba_port *uap = (struct uart_amba_port *)port;
112 unsigned int cr;
113
114 cr = readb(uap->port.membase + UART010_CR);
115 cr |= UART010_CR_MSIE;
116 writel(cr, uap->port.membase + UART010_CR);
117 }
118
119 static void pl010_rx_chars(struct uart_amba_port *uap)
120 {
121 struct tty_struct *tty = uap->port.state->port.tty;
122 unsigned int status, ch, flag, rsr, max_count = 256;
123
124 status = readb(uap->port.membase + UART01x_FR);
125 while (UART_RX_DATA(status) && max_count--) {
126 ch = readb(uap->port.membase + UART01x_DR);
127 flag = TTY_NORMAL;
128
129 uap->port.icount.rx++;
130
131 /*
132 * Note that the error handling code is
133 * out of the main execution path
134 */
135 rsr = readb(uap->port.membase + UART01x_RSR) | UART_DUMMY_RSR_RX;
136 if (unlikely(rsr & UART01x_RSR_ANY)) {
137 writel(0, uap->port.membase + UART01x_ECR);
138
139 if (rsr & UART01x_RSR_BE) {
140 rsr &= ~(UART01x_RSR_FE | UART01x_RSR_PE);
141 uap->port.icount.brk++;
142 if (uart_handle_break(&uap->port))
143 goto ignore_char;
144 } else if (rsr & UART01x_RSR_PE)
145 uap->port.icount.parity++;
146 else if (rsr & UART01x_RSR_FE)
147 uap->port.icount.frame++;
148 if (rsr & UART01x_RSR_OE)
149 uap->port.icount.overrun++;
150
151 rsr &= uap->port.read_status_mask;
152
153 if (rsr & UART01x_RSR_BE)
154 flag = TTY_BREAK;
155 else if (rsr & UART01x_RSR_PE)
156 flag = TTY_PARITY;
157 else if (rsr & UART01x_RSR_FE)
158 flag = TTY_FRAME;
159 }
160
161 if (uart_handle_sysrq_char(&uap->port, ch))
162 goto ignore_char;
163
164 uart_insert_char(&uap->port, rsr, UART01x_RSR_OE, ch, flag);
165
166 ignore_char:
167 status = readb(uap->port.membase + UART01x_FR);
168 }
169 spin_unlock(&uap->port.lock);
170 tty_flip_buffer_push(tty);
171 spin_lock(&uap->port.lock);
172 }
173
174 static void pl010_tx_chars(struct uart_amba_port *uap)
175 {
176 struct circ_buf *xmit = &uap->port.state->xmit;
177 int count;
178
179 if (uap->port.x_char) {
180 writel(uap->port.x_char, uap->port.membase + UART01x_DR);
181 uap->port.icount.tx++;
182 uap->port.x_char = 0;
183 return;
184 }
185 if (uart_circ_empty(xmit) || uart_tx_stopped(&uap->port)) {
186 pl010_stop_tx(&uap->port);
187 return;
188 }
189
190 count = uap->port.fifosize >> 1;
191 do {
192 writel(xmit->buf[xmit->tail], uap->port.membase + UART01x_DR);
193 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
194 uap->port.icount.tx++;
195 if (uart_circ_empty(xmit))
196 break;
197 } while (--count > 0);
198
199 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
200 uart_write_wakeup(&uap->port);
201
202 if (uart_circ_empty(xmit))
203 pl010_stop_tx(&uap->port);
204 }
205
206 static void pl010_modem_status(struct uart_amba_port *uap)
207 {
208 unsigned int status, delta;
209
210 writel(0, uap->port.membase + UART010_ICR);
211
212 status = readb(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
213
214 delta = status ^ uap->old_status;
215 uap->old_status = status;
216
217 if (!delta)
218 return;
219
220 if (delta & UART01x_FR_DCD)
221 uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD);
222
223 if (delta & UART01x_FR_DSR)
224 uap->port.icount.dsr++;
225
226 if (delta & UART01x_FR_CTS)
227 uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS);
228
229 wake_up_interruptible(&uap->port.state->port.delta_msr_wait);
230 }
231
232 static irqreturn_t pl010_int(int irq, void *dev_id)
233 {
234 struct uart_amba_port *uap = dev_id;
235 unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
236 int handled = 0;
237
238 spin_lock(&uap->port.lock);
239
240 status = readb(uap->port.membase + UART010_IIR);
241 if (status) {
242 do {
243 if (status & (UART010_IIR_RTIS | UART010_IIR_RIS))
244 pl010_rx_chars(uap);
245 if (status & UART010_IIR_MIS)
246 pl010_modem_status(uap);
247 if (status & UART010_IIR_TIS)
248 pl010_tx_chars(uap);
249
250 if (pass_counter-- == 0)
251 break;
252
253 status = readb(uap->port.membase + UART010_IIR);
254 } while (status & (UART010_IIR_RTIS | UART010_IIR_RIS |
255 UART010_IIR_TIS));
256 handled = 1;
257 }
258
259 spin_unlock(&uap->port.lock);
260
261 return IRQ_RETVAL(handled);
262 }
263
264 static unsigned int pl010_tx_empty(struct uart_port *port)
265 {
266 struct uart_amba_port *uap = (struct uart_amba_port *)port;
267 unsigned int status = readb(uap->port.membase + UART01x_FR);
268 return status & UART01x_FR_BUSY ? 0 : TIOCSER_TEMT;
269 }
270
271 static unsigned int pl010_get_mctrl(struct uart_port *port)
272 {
273 struct uart_amba_port *uap = (struct uart_amba_port *)port;
274 unsigned int result = 0;
275 unsigned int status;
276
277 status = readb(uap->port.membase + UART01x_FR);
278 if (status & UART01x_FR_DCD)
279 result |= TIOCM_CAR;
280 if (status & UART01x_FR_DSR)
281 result |= TIOCM_DSR;
282 if (status & UART01x_FR_CTS)
283 result |= TIOCM_CTS;
284
285 return result;
286 }
287
288 static void pl010_set_mctrl(struct uart_port *port, unsigned int mctrl)
289 {
290 struct uart_amba_port *uap = (struct uart_amba_port *)port;
291
292 if (uap->data)
293 uap->data->set_mctrl(uap->dev, uap->port.membase, mctrl);
294 }
295
296 static void pl010_break_ctl(struct uart_port *port, int break_state)
297 {
298 struct uart_amba_port *uap = (struct uart_amba_port *)port;
299 unsigned long flags;
300 unsigned int lcr_h;
301
302 spin_lock_irqsave(&uap->port.lock, flags);
303 lcr_h = readb(uap->port.membase + UART010_LCRH);
304 if (break_state == -1)
305 lcr_h |= UART01x_LCRH_BRK;
306 else
307 lcr_h &= ~UART01x_LCRH_BRK;
308 writel(lcr_h, uap->port.membase + UART010_LCRH);
309 spin_unlock_irqrestore(&uap->port.lock, flags);
310 }
311
312 static int pl010_startup(struct uart_port *port)
313 {
314 struct uart_amba_port *uap = (struct uart_amba_port *)port;
315 int retval;
316
317 /*
318 * Try to enable the clock producer.
319 */
320 retval = clk_enable(uap->clk);
321 if (retval)
322 goto out;
323
324 uap->port.uartclk = clk_get_rate(uap->clk);
325
326 /*
327 * Allocate the IRQ
328 */
329 retval = request_irq(uap->port.irq, pl010_int, 0, "uart-pl010", uap);
330 if (retval)
331 goto clk_dis;
332
333 /*
334 * initialise the old status of the modem signals
335 */
336 uap->old_status = readb(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
337
338 /*
339 * Finally, enable interrupts
340 */
341 writel(UART01x_CR_UARTEN | UART010_CR_RIE | UART010_CR_RTIE,
342 uap->port.membase + UART010_CR);
343
344 return 0;
345
346 clk_dis:
347 clk_disable(uap->clk);
348 out:
349 return retval;
350 }
351
352 static void pl010_shutdown(struct uart_port *port)
353 {
354 struct uart_amba_port *uap = (struct uart_amba_port *)port;
355
356 /*
357 * Free the interrupt
358 */
359 free_irq(uap->port.irq, uap);
360
361 /*
362 * disable all interrupts, disable the port
363 */
364 writel(0, uap->port.membase + UART010_CR);
365
366 /* disable break condition and fifos */
367 writel(readb(uap->port.membase + UART010_LCRH) &
368 ~(UART01x_LCRH_BRK | UART01x_LCRH_FEN),
369 uap->port.membase + UART010_LCRH);
370
371 /*
372 * Shut down the clock producer
373 */
374 clk_disable(uap->clk);
375 }
376
377 static void
378 pl010_set_termios(struct uart_port *port, struct ktermios *termios,
379 struct ktermios *old)
380 {
381 struct uart_amba_port *uap = (struct uart_amba_port *)port;
382 unsigned int lcr_h, old_cr;
383 unsigned long flags;
384 unsigned int baud, quot;
385
386 /*
387 * Ask the core to calculate the divisor for us.
388 */
389 baud = uart_get_baud_rate(port, termios, old, 0, uap->port.uartclk/16);
390 quot = uart_get_divisor(port, baud);
391
392 switch (termios->c_cflag & CSIZE) {
393 case CS5:
394 lcr_h = UART01x_LCRH_WLEN_5;
395 break;
396 case CS6:
397 lcr_h = UART01x_LCRH_WLEN_6;
398 break;
399 case CS7:
400 lcr_h = UART01x_LCRH_WLEN_7;
401 break;
402 default: // CS8
403 lcr_h = UART01x_LCRH_WLEN_8;
404 break;
405 }
406 if (termios->c_cflag & CSTOPB)
407 lcr_h |= UART01x_LCRH_STP2;
408 if (termios->c_cflag & PARENB) {
409 lcr_h |= UART01x_LCRH_PEN;
410 if (!(termios->c_cflag & PARODD))
411 lcr_h |= UART01x_LCRH_EPS;
412 }
413 if (uap->port.fifosize > 1)
414 lcr_h |= UART01x_LCRH_FEN;
415
416 spin_lock_irqsave(&uap->port.lock, flags);
417
418 /*
419 * Update the per-port timeout.
420 */
421 uart_update_timeout(port, termios->c_cflag, baud);
422
423 uap->port.read_status_mask = UART01x_RSR_OE;
424 if (termios->c_iflag & INPCK)
425 uap->port.read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
426 if (termios->c_iflag & (BRKINT | PARMRK))
427 uap->port.read_status_mask |= UART01x_RSR_BE;
428
429 /*
430 * Characters to ignore
431 */
432 uap->port.ignore_status_mask = 0;
433 if (termios->c_iflag & IGNPAR)
434 uap->port.ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
435 if (termios->c_iflag & IGNBRK) {
436 uap->port.ignore_status_mask |= UART01x_RSR_BE;
437 /*
438 * If we're ignoring parity and break indicators,
439 * ignore overruns too (for real raw support).
440 */
441 if (termios->c_iflag & IGNPAR)
442 uap->port.ignore_status_mask |= UART01x_RSR_OE;
443 }
444
445 /*
446 * Ignore all characters if CREAD is not set.
447 */
448 if ((termios->c_cflag & CREAD) == 0)
449 uap->port.ignore_status_mask |= UART_DUMMY_RSR_RX;
450
451 /* first, disable everything */
452 old_cr = readb(uap->port.membase + UART010_CR) & ~UART010_CR_MSIE;
453
454 if (UART_ENABLE_MS(port, termios->c_cflag))
455 old_cr |= UART010_CR_MSIE;
456
457 writel(0, uap->port.membase + UART010_CR);
458
459 /* Set baud rate */
460 quot -= 1;
461 writel((quot & 0xf00) >> 8, uap->port.membase + UART010_LCRM);
462 writel(quot & 0xff, uap->port.membase + UART010_LCRL);
463
464 /*
465 * ----------v----------v----------v----------v-----
466 * NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L
467 * ----------^----------^----------^----------^-----
468 */
469 writel(lcr_h, uap->port.membase + UART010_LCRH);
470 writel(old_cr, uap->port.membase + UART010_CR);
471
472 spin_unlock_irqrestore(&uap->port.lock, flags);
473 }
474
475 static void pl010_set_ldisc(struct uart_port *port, int new)
476 {
477 if (new == N_PPS) {
478 port->flags |= UPF_HARDPPS_CD;
479 pl010_enable_ms(port);
480 } else
481 port->flags &= ~UPF_HARDPPS_CD;
482 }
483
484 static const char *pl010_type(struct uart_port *port)
485 {
486 return port->type == PORT_AMBA ? "AMBA" : NULL;
487 }
488
489 /*
490 * Release the memory region(s) being used by 'port'
491 */
492 static void pl010_release_port(struct uart_port *port)
493 {
494 release_mem_region(port->mapbase, UART_PORT_SIZE);
495 }
496
497 /*
498 * Request the memory region(s) being used by 'port'
499 */
500 static int pl010_request_port(struct uart_port *port)
501 {
502 return request_mem_region(port->mapbase, UART_PORT_SIZE, "uart-pl010")
503 != NULL ? 0 : -EBUSY;
504 }
505
506 /*
507 * Configure/autoconfigure the port.
508 */
509 static void pl010_config_port(struct uart_port *port, int flags)
510 {
511 if (flags & UART_CONFIG_TYPE) {
512 port->type = PORT_AMBA;
513 pl010_request_port(port);
514 }
515 }
516
517 /*
518 * verify the new serial_struct (for TIOCSSERIAL).
519 */
520 static int pl010_verify_port(struct uart_port *port, struct serial_struct *ser)
521 {
522 int ret = 0;
523 if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMBA)
524 ret = -EINVAL;
525 if (ser->irq < 0 || ser->irq >= nr_irqs)
526 ret = -EINVAL;
527 if (ser->baud_base < 9600)
528 ret = -EINVAL;
529 return ret;
530 }
531
532 static struct uart_ops amba_pl010_pops = {
533 .tx_empty = pl010_tx_empty,
534 .set_mctrl = pl010_set_mctrl,
535 .get_mctrl = pl010_get_mctrl,
536 .stop_tx = pl010_stop_tx,
537 .start_tx = pl010_start_tx,
538 .stop_rx = pl010_stop_rx,
539 .enable_ms = pl010_enable_ms,
540 .break_ctl = pl010_break_ctl,
541 .startup = pl010_startup,
542 .shutdown = pl010_shutdown,
543 .set_termios = pl010_set_termios,
544 .set_ldisc = pl010_set_ldisc,
545 .type = pl010_type,
546 .release_port = pl010_release_port,
547 .request_port = pl010_request_port,
548 .config_port = pl010_config_port,
549 .verify_port = pl010_verify_port,
550 };
551
552 static struct uart_amba_port *amba_ports[UART_NR];
553
554 #ifdef CONFIG_SERIAL_AMBA_PL010_CONSOLE
555
556 static void pl010_console_putchar(struct uart_port *port, int ch)
557 {
558 struct uart_amba_port *uap = (struct uart_amba_port *)port;
559 unsigned int status;
560
561 do {
562 status = readb(uap->port.membase + UART01x_FR);
563 barrier();
564 } while (!UART_TX_READY(status));
565 writel(ch, uap->port.membase + UART01x_DR);
566 }
567
568 static void
569 pl010_console_write(struct console *co, const char *s, unsigned int count)
570 {
571 struct uart_amba_port *uap = amba_ports[co->index];
572 unsigned int status, old_cr;
573
574 clk_enable(uap->clk);
575
576 /*
577 * First save the CR then disable the interrupts
578 */
579 old_cr = readb(uap->port.membase + UART010_CR);
580 writel(UART01x_CR_UARTEN, uap->port.membase + UART010_CR);
581
582 uart_console_write(&uap->port, s, count, pl010_console_putchar);
583
584 /*
585 * Finally, wait for transmitter to become empty
586 * and restore the TCR
587 */
588 do {
589 status = readb(uap->port.membase + UART01x_FR);
590 barrier();
591 } while (status & UART01x_FR_BUSY);
592 writel(old_cr, uap->port.membase + UART010_CR);
593
594 clk_disable(uap->clk);
595 }
596
597 static void __init
598 pl010_console_get_options(struct uart_amba_port *uap, int *baud,
599 int *parity, int *bits)
600 {
601 if (readb(uap->port.membase + UART010_CR) & UART01x_CR_UARTEN) {
602 unsigned int lcr_h, quot;
603 lcr_h = readb(uap->port.membase + UART010_LCRH);
604
605 *parity = 'n';
606 if (lcr_h & UART01x_LCRH_PEN) {
607 if (lcr_h & UART01x_LCRH_EPS)
608 *parity = 'e';
609 else
610 *parity = 'o';
611 }
612
613 if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7)
614 *bits = 7;
615 else
616 *bits = 8;
617
618 quot = readb(uap->port.membase + UART010_LCRL) |
619 readb(uap->port.membase + UART010_LCRM) << 8;
620 *baud = uap->port.uartclk / (16 * (quot + 1));
621 }
622 }
623
624 static int __init pl010_console_setup(struct console *co, char *options)
625 {
626 struct uart_amba_port *uap;
627 int baud = 38400;
628 int bits = 8;
629 int parity = 'n';
630 int flow = 'n';
631
632 /*
633 * Check whether an invalid uart number has been specified, and
634 * if so, search for the first available port that does have
635 * console support.
636 */
637 if (co->index >= UART_NR)
638 co->index = 0;
639 uap = amba_ports[co->index];
640 if (!uap)
641 return -ENODEV;
642
643 uap->port.uartclk = clk_get_rate(uap->clk);
644
645 if (options)
646 uart_parse_options(options, &baud, &parity, &bits, &flow);
647 else
648 pl010_console_get_options(uap, &baud, &parity, &bits);
649
650 return uart_set_options(&uap->port, co, baud, parity, bits, flow);
651 }
652
653 static struct uart_driver amba_reg;
654 static struct console amba_console = {
655 .name = "ttyAM",
656 .write = pl010_console_write,
657 .device = uart_console_device,
658 .setup = pl010_console_setup,
659 .flags = CON_PRINTBUFFER,
660 .index = -1,
661 .data = &amba_reg,
662 };
663
664 #define AMBA_CONSOLE &amba_console
665 #else
666 #define AMBA_CONSOLE NULL
667 #endif
668
669 static struct uart_driver amba_reg = {
670 .owner = THIS_MODULE,
671 .driver_name = "ttyAM",
672 .dev_name = "ttyAM",
673 .major = SERIAL_AMBA_MAJOR,
674 .minor = SERIAL_AMBA_MINOR,
675 .nr = UART_NR,
676 .cons = AMBA_CONSOLE,
677 };
678
679 static int pl010_probe(struct amba_device *dev, struct amba_id *id)
680 {
681 struct uart_amba_port *uap;
682 void __iomem *base;
683 int i, ret;
684
685 for (i = 0; i < ARRAY_SIZE(amba_ports); i++)
686 if (amba_ports[i] == NULL)
687 break;
688
689 if (i == ARRAY_SIZE(amba_ports)) {
690 ret = -EBUSY;
691 goto out;
692 }
693
694 uap = kzalloc(sizeof(struct uart_amba_port), GFP_KERNEL);
695 if (!uap) {
696 ret = -ENOMEM;
697 goto out;
698 }
699
700 base = ioremap(dev->res.start, resource_size(&dev->res));
701 if (!base) {
702 ret = -ENOMEM;
703 goto free;
704 }
705
706 uap->clk = clk_get(&dev->dev, NULL);
707 if (IS_ERR(uap->clk)) {
708 ret = PTR_ERR(uap->clk);
709 goto unmap;
710 }
711
712 uap->port.dev = &dev->dev;
713 uap->port.mapbase = dev->res.start;
714 uap->port.membase = base;
715 uap->port.iotype = UPIO_MEM;
716 uap->port.irq = dev->irq[0];
717 uap->port.fifosize = 16;
718 uap->port.ops = &amba_pl010_pops;
719 uap->port.flags = UPF_BOOT_AUTOCONF;
720 uap->port.line = i;
721 uap->dev = dev;
722 uap->data = dev->dev.platform_data;
723
724 amba_ports[i] = uap;
725
726 amba_set_drvdata(dev, uap);
727 ret = uart_add_one_port(&amba_reg, &uap->port);
728 if (ret) {
729 amba_set_drvdata(dev, NULL);
730 amba_ports[i] = NULL;
731 clk_put(uap->clk);
732 unmap:
733 iounmap(base);
734 free:
735 kfree(uap);
736 }
737 out:
738 return ret;
739 }
740
741 static int pl010_remove(struct amba_device *dev)
742 {
743 struct uart_amba_port *uap = amba_get_drvdata(dev);
744 int i;
745
746 amba_set_drvdata(dev, NULL);
747
748 uart_remove_one_port(&amba_reg, &uap->port);
749
750 for (i = 0; i < ARRAY_SIZE(amba_ports); i++)
751 if (amba_ports[i] == uap)
752 amba_ports[i] = NULL;
753
754 iounmap(uap->port.membase);
755 clk_put(uap->clk);
756 kfree(uap);
757 return 0;
758 }
759
760 static int pl010_suspend(struct amba_device *dev, pm_message_t state)
761 {
762 struct uart_amba_port *uap = amba_get_drvdata(dev);
763
764 if (uap)
765 uart_suspend_port(&amba_reg, &uap->port);
766
767 return 0;
768 }
769
770 static int pl010_resume(struct amba_device *dev)
771 {
772 struct uart_amba_port *uap = amba_get_drvdata(dev);
773
774 if (uap)
775 uart_resume_port(&amba_reg, &uap->port);
776
777 return 0;
778 }
779
780 static struct amba_id pl010_ids[] = {
781 {
782 .id = 0x00041010,
783 .mask = 0x000fffff,
784 },
785 { 0, 0 },
786 };
787
788 static struct amba_driver pl010_driver = {
789 .drv = {
790 .name = "uart-pl010",
791 },
792 .id_table = pl010_ids,
793 .probe = pl010_probe,
794 .remove = pl010_remove,
795 .suspend = pl010_suspend,
796 .resume = pl010_resume,
797 };
798
799 static int __init pl010_init(void)
800 {
801 int ret;
802
803 printk(KERN_INFO "Serial: AMBA driver\n");
804
805 ret = uart_register_driver(&amba_reg);
806 if (ret == 0) {
807 ret = amba_driver_register(&pl010_driver);
808 if (ret)
809 uart_unregister_driver(&amba_reg);
810 }
811 return ret;
812 }
813
814 static void __exit pl010_exit(void)
815 {
816 amba_driver_unregister(&pl010_driver);
817 uart_unregister_driver(&amba_reg);
818 }
819
820 module_init(pl010_init);
821 module_exit(pl010_exit);
822
823 MODULE_AUTHOR("ARM Ltd/Deep Blue Solutions Ltd");
824 MODULE_DESCRIPTION("ARM AMBA serial port driver");
825 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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