?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
p4-clockmod: Replace cpu_sibling_mask() with topology_sibling_cpumask()
[linux/fpc-iii.git] / drivers / tty / serial / ar933x_uart.c
blob1519d2ca7705f23eb785b083ed8364b0d46e1de3
1 /*
2 * Atheros AR933X SoC built-in UART driver
3 *
4 * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
5 *
6 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published
10 * by the Free Software Foundation.
11 */
12
13 #include <linux/module.h>
14 #include <linux/ioport.h>
15 #include <linux/init.h>
16 #include <linux/console.h>
17 #include <linux/sysrq.h>
18 #include <linux/delay.h>
19 #include <linux/platform_device.h>
20 #include <linux/of.h>
21 #include <linux/of_platform.h>
22 #include <linux/tty.h>
23 #include <linux/tty_flip.h>
24 #include <linux/serial_core.h>
25 #include <linux/serial.h>
26 #include <linux/slab.h>
27 #include <linux/io.h>
28 #include <linux/irq.h>
29 #include <linux/clk.h>
30
31 #include <asm/div64.h>
32
33 #include <asm/mach-ath79/ar933x_uart.h>
34
35 #define DRIVER_NAME "ar933x-uart"
36
37 #define AR933X_UART_MAX_SCALE 0xff
38 #define AR933X_UART_MAX_STEP 0xffff
39
40 #define AR933X_UART_MIN_BAUD 300
41 #define AR933X_UART_MAX_BAUD 3000000
42
43 #define AR933X_DUMMY_STATUS_RD 0x01
44
45 static struct uart_driver ar933x_uart_driver;
46
47 struct ar933x_uart_port {
48 struct uart_port port;
49 unsigned int ier; /* shadow Interrupt Enable Register */
50 unsigned int min_baud;
51 unsigned int max_baud;
52 struct clk *clk;
53 };
54
55 static inline bool ar933x_uart_console_enabled(void)
56 {
57 return config_enabled(CONFIG_SERIAL_AR933X_CONSOLE);
58 }
59
60 static inline unsigned int ar933x_uart_read(struct ar933x_uart_port *up,
61 int offset)
62 {
63 return readl(up->port.membase + offset);
64 }
65
66 static inline void ar933x_uart_write(struct ar933x_uart_port *up,
67 int offset, unsigned int value)
68 {
69 writel(value, up->port.membase + offset);
70 }
71
72 static inline void ar933x_uart_rmw(struct ar933x_uart_port *up,
73 unsigned int offset,
74 unsigned int mask,
75 unsigned int val)
76 {
77 unsigned int t;
78
79 t = ar933x_uart_read(up, offset);
80 t &= ~mask;
81 t |= val;
82 ar933x_uart_write(up, offset, t);
83 }
84
85 static inline void ar933x_uart_rmw_set(struct ar933x_uart_port *up,
86 unsigned int offset,
87 unsigned int val)
88 {
89 ar933x_uart_rmw(up, offset, 0, val);
90 }
91
92 static inline void ar933x_uart_rmw_clear(struct ar933x_uart_port *up,
93 unsigned int offset,
94 unsigned int val)
95 {
96 ar933x_uart_rmw(up, offset, val, 0);
97 }
98
99 static inline void ar933x_uart_start_tx_interrupt(struct ar933x_uart_port *up)
100 {
101 up->ier |= AR933X_UART_INT_TX_EMPTY;
102 ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier);
103 }
104
105 static inline void ar933x_uart_stop_tx_interrupt(struct ar933x_uart_port *up)
106 {
107 up->ier &= ~AR933X_UART_INT_TX_EMPTY;
108 ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier);
109 }
110
111 static inline void ar933x_uart_putc(struct ar933x_uart_port *up, int ch)
112 {
113 unsigned int rdata;
114
115 rdata = ch & AR933X_UART_DATA_TX_RX_MASK;
116 rdata |= AR933X_UART_DATA_TX_CSR;
117 ar933x_uart_write(up, AR933X_UART_DATA_REG, rdata);
118 }
119
120 static unsigned int ar933x_uart_tx_empty(struct uart_port *port)
121 {
122 struct ar933x_uart_port *up =
123 container_of(port, struct ar933x_uart_port, port);
124 unsigned long flags;
125 unsigned int rdata;
126
127 spin_lock_irqsave(&up->port.lock, flags);
128 rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG);
129 spin_unlock_irqrestore(&up->port.lock, flags);
130
131 return (rdata & AR933X_UART_DATA_TX_CSR) ? 0 : TIOCSER_TEMT;
132 }
133
134 static unsigned int ar933x_uart_get_mctrl(struct uart_port *port)
135 {
136 return TIOCM_CAR;
137 }
138
139 static void ar933x_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
140 {
141 }
142
143 static void ar933x_uart_start_tx(struct uart_port *port)
144 {
145 struct ar933x_uart_port *up =
146 container_of(port, struct ar933x_uart_port, port);
147
148 ar933x_uart_start_tx_interrupt(up);
149 }
150
151 static void ar933x_uart_stop_tx(struct uart_port *port)
152 {
153 struct ar933x_uart_port *up =
154 container_of(port, struct ar933x_uart_port, port);
155
156 ar933x_uart_stop_tx_interrupt(up);
157 }
158
159 static void ar933x_uart_stop_rx(struct uart_port *port)
160 {
161 struct ar933x_uart_port *up =
162 container_of(port, struct ar933x_uart_port, port);
163
164 up->ier &= ~AR933X_UART_INT_RX_VALID;
165 ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier);
166 }
167
168 static void ar933x_uart_break_ctl(struct uart_port *port, int break_state)
169 {
170 struct ar933x_uart_port *up =
171 container_of(port, struct ar933x_uart_port, port);
172 unsigned long flags;
173
174 spin_lock_irqsave(&up->port.lock, flags);
175 if (break_state == -1)
176 ar933x_uart_rmw_set(up, AR933X_UART_CS_REG,
177 AR933X_UART_CS_TX_BREAK);
178 else
179 ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG,
180 AR933X_UART_CS_TX_BREAK);
181 spin_unlock_irqrestore(&up->port.lock, flags);
182 }
183
184 /*
185 * baudrate = (clk / (scale + 1)) * (step * (1 / 2^17))
186 */
187 static unsigned long ar933x_uart_get_baud(unsigned int clk,
188 unsigned int scale,
189 unsigned int step)
190 {
191 u64 t;
192 u32 div;
193
194 div = (2 << 16) * (scale + 1);
195 t = clk;
196 t *= step;
197 t += (div / 2);
198 do_div(t, div);
199
200 return t;
201 }
202
203 static void ar933x_uart_get_scale_step(unsigned int clk,
204 unsigned int baud,
205 unsigned int *scale,
206 unsigned int *step)
207 {
208 unsigned int tscale;
209 long min_diff;
210
211 *scale = 0;
212 *step = 0;
213
214 min_diff = baud;
215 for (tscale = 0; tscale < AR933X_UART_MAX_SCALE; tscale++) {
216 u64 tstep;
217 int diff;
218
219 tstep = baud * (tscale + 1);
220 tstep *= (2 << 16);
221 do_div(tstep, clk);
222
223 if (tstep > AR933X_UART_MAX_STEP)
224 break;
225
226 diff = abs(ar933x_uart_get_baud(clk, tscale, tstep) - baud);
227 if (diff < min_diff) {
228 min_diff = diff;
229 *scale = tscale;
230 *step = tstep;
231 }
232 }
233 }
234
235 static void ar933x_uart_set_termios(struct uart_port *port,
236 struct ktermios *new,
237 struct ktermios *old)
238 {
239 struct ar933x_uart_port *up =
240 container_of(port, struct ar933x_uart_port, port);
241 unsigned int cs;
242 unsigned long flags;
243 unsigned int baud, scale, step;
244
245 /* Only CS8 is supported */
246 new->c_cflag &= ~CSIZE;
247 new->c_cflag |= CS8;
248
249 /* Only one stop bit is supported */
250 new->c_cflag &= ~CSTOPB;
251
252 cs = 0;
253 if (new->c_cflag & PARENB) {
254 if (!(new->c_cflag & PARODD))
255 cs |= AR933X_UART_CS_PARITY_EVEN;
256 else
257 cs |= AR933X_UART_CS_PARITY_ODD;
258 } else {
259 cs |= AR933X_UART_CS_PARITY_NONE;
260 }
261
262 /* Mark/space parity is not supported */
263 new->c_cflag &= ~CMSPAR;
264
265 baud = uart_get_baud_rate(port, new, old, up->min_baud, up->max_baud);
266 ar933x_uart_get_scale_step(port->uartclk, baud, &scale, &step);
267
268 /*
269 * Ok, we're now changing the port state. Do it with
270 * interrupts disabled.
271 */
272 spin_lock_irqsave(&up->port.lock, flags);
273
274 /* disable the UART */
275 ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG,
276 AR933X_UART_CS_IF_MODE_M << AR933X_UART_CS_IF_MODE_S);
277
278 /* Update the per-port timeout. */
279 uart_update_timeout(port, new->c_cflag, baud);
280
281 up->port.ignore_status_mask = 0;
282
283 /* ignore all characters if CREAD is not set */
284 if ((new->c_cflag & CREAD) == 0)
285 up->port.ignore_status_mask |= AR933X_DUMMY_STATUS_RD;
286
287 ar933x_uart_write(up, AR933X_UART_CLOCK_REG,
288 scale << AR933X_UART_CLOCK_SCALE_S | step);
289
290 /* setup configuration register */
291 ar933x_uart_rmw(up, AR933X_UART_CS_REG, AR933X_UART_CS_PARITY_M, cs);
292
293 /* enable host interrupt */
294 ar933x_uart_rmw_set(up, AR933X_UART_CS_REG,
295 AR933X_UART_CS_HOST_INT_EN);
296
297 /* reenable the UART */
298 ar933x_uart_rmw(up, AR933X_UART_CS_REG,
299 AR933X_UART_CS_IF_MODE_M << AR933X_UART_CS_IF_MODE_S,
300 AR933X_UART_CS_IF_MODE_DCE << AR933X_UART_CS_IF_MODE_S);
301
302 spin_unlock_irqrestore(&up->port.lock, flags);
303
304 if (tty_termios_baud_rate(new))
305 tty_termios_encode_baud_rate(new, baud, baud);
306 }
307
308 static void ar933x_uart_rx_chars(struct ar933x_uart_port *up)
309 {
310 struct tty_port *port = &up->port.state->port;
311 int max_count = 256;
312
313 do {
314 unsigned int rdata;
315 unsigned char ch;
316
317 rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG);
318 if ((rdata & AR933X_UART_DATA_RX_CSR) == 0)
319 break;
320
321 /* remove the character from the FIFO */
322 ar933x_uart_write(up, AR933X_UART_DATA_REG,
323 AR933X_UART_DATA_RX_CSR);
324
325 up->port.icount.rx++;
326 ch = rdata & AR933X_UART_DATA_TX_RX_MASK;
327
328 if (uart_handle_sysrq_char(&up->port, ch))
329 continue;
330
331 if ((up->port.ignore_status_mask & AR933X_DUMMY_STATUS_RD) == 0)
332 tty_insert_flip_char(port, ch, TTY_NORMAL);
333 } while (max_count-- > 0);
334
335 spin_unlock(&up->port.lock);
336 tty_flip_buffer_push(port);
337 spin_lock(&up->port.lock);
338 }
339
340 static void ar933x_uart_tx_chars(struct ar933x_uart_port *up)
341 {
342 struct circ_buf *xmit = &up->port.state->xmit;
343 int count;
344
345 if (uart_tx_stopped(&up->port))
346 return;
347
348 count = up->port.fifosize;
349 do {
350 unsigned int rdata;
351
352 rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG);
353 if ((rdata & AR933X_UART_DATA_TX_CSR) == 0)
354 break;
355
356 if (up->port.x_char) {
357 ar933x_uart_putc(up, up->port.x_char);
358 up->port.icount.tx++;
359 up->port.x_char = 0;
360 continue;
361 }
362
363 if (uart_circ_empty(xmit))
364 break;
365
366 ar933x_uart_putc(up, xmit->buf[xmit->tail]);
367
368 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
369 up->port.icount.tx++;
370 } while (--count > 0);
371
372 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
373 uart_write_wakeup(&up->port);
374
375 if (!uart_circ_empty(xmit))
376 ar933x_uart_start_tx_interrupt(up);
377 }
378
379 static irqreturn_t ar933x_uart_interrupt(int irq, void *dev_id)
380 {
381 struct ar933x_uart_port *up = dev_id;
382 unsigned int status;
383
384 status = ar933x_uart_read(up, AR933X_UART_CS_REG);
385 if ((status & AR933X_UART_CS_HOST_INT) == 0)
386 return IRQ_NONE;
387
388 spin_lock(&up->port.lock);
389
390 status = ar933x_uart_read(up, AR933X_UART_INT_REG);
391 status &= ar933x_uart_read(up, AR933X_UART_INT_EN_REG);
392
393 if (status & AR933X_UART_INT_RX_VALID) {
394 ar933x_uart_write(up, AR933X_UART_INT_REG,
395 AR933X_UART_INT_RX_VALID);
396 ar933x_uart_rx_chars(up);
397 }
398
399 if (status & AR933X_UART_INT_TX_EMPTY) {
400 ar933x_uart_write(up, AR933X_UART_INT_REG,
401 AR933X_UART_INT_TX_EMPTY);
402 ar933x_uart_stop_tx_interrupt(up);
403 ar933x_uart_tx_chars(up);
404 }
405
406 spin_unlock(&up->port.lock);
407
408 return IRQ_HANDLED;
409 }
410
411 static int ar933x_uart_startup(struct uart_port *port)
412 {
413 struct ar933x_uart_port *up =
414 container_of(port, struct ar933x_uart_port, port);
415 unsigned long flags;
416 int ret;
417
418 ret = request_irq(up->port.irq, ar933x_uart_interrupt,
419 up->port.irqflags, dev_name(up->port.dev), up);
420 if (ret)
421 return ret;
422
423 spin_lock_irqsave(&up->port.lock, flags);
424
425 /* Enable HOST interrupts */
426 ar933x_uart_rmw_set(up, AR933X_UART_CS_REG,
427 AR933X_UART_CS_HOST_INT_EN);
428
429 /* Enable RX interrupts */
430 up->ier = AR933X_UART_INT_RX_VALID;
431 ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier);
432
433 spin_unlock_irqrestore(&up->port.lock, flags);
434
435 return 0;
436 }
437
438 static void ar933x_uart_shutdown(struct uart_port *port)
439 {
440 struct ar933x_uart_port *up =
441 container_of(port, struct ar933x_uart_port, port);
442
443 /* Disable all interrupts */
444 up->ier = 0;
445 ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier);
446
447 /* Disable break condition */
448 ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG,
449 AR933X_UART_CS_TX_BREAK);
450
451 free_irq(up->port.irq, up);
452 }
453
454 static const char *ar933x_uart_type(struct uart_port *port)
455 {
456 return (port->type == PORT_AR933X) ? "AR933X UART" : NULL;
457 }
458
459 static void ar933x_uart_release_port(struct uart_port *port)
460 {
461 /* Nothing to release ... */
462 }
463
464 static int ar933x_uart_request_port(struct uart_port *port)
465 {
466 /* UARTs always present */
467 return 0;
468 }
469
470 static void ar933x_uart_config_port(struct uart_port *port, int flags)
471 {
472 if (flags & UART_CONFIG_TYPE)
473 port->type = PORT_AR933X;
474 }
475
476 static int ar933x_uart_verify_port(struct uart_port *port,
477 struct serial_struct *ser)
478 {
479 struct ar933x_uart_port *up =
480 container_of(port, struct ar933x_uart_port, port);
481
482 if (ser->type != PORT_UNKNOWN &&
483 ser->type != PORT_AR933X)
484 return -EINVAL;
485
486 if (ser->irq < 0 || ser->irq >= NR_IRQS)
487 return -EINVAL;
488
489 if (ser->baud_base < up->min_baud ||
490 ser->baud_base > up->max_baud)
491 return -EINVAL;
492
493 return 0;
494 }
495
496 static struct uart_ops ar933x_uart_ops = {
497 .tx_empty = ar933x_uart_tx_empty,
498 .set_mctrl = ar933x_uart_set_mctrl,
499 .get_mctrl = ar933x_uart_get_mctrl,
500 .stop_tx = ar933x_uart_stop_tx,
501 .start_tx = ar933x_uart_start_tx,
502 .stop_rx = ar933x_uart_stop_rx,
503 .break_ctl = ar933x_uart_break_ctl,
504 .startup = ar933x_uart_startup,
505 .shutdown = ar933x_uart_shutdown,
506 .set_termios = ar933x_uart_set_termios,
507 .type = ar933x_uart_type,
508 .release_port = ar933x_uart_release_port,
509 .request_port = ar933x_uart_request_port,
510 .config_port = ar933x_uart_config_port,
511 .verify_port = ar933x_uart_verify_port,
512 };
513
514 static struct ar933x_uart_port *
515 ar933x_console_ports[CONFIG_SERIAL_AR933X_NR_UARTS];
516
517 static void ar933x_uart_wait_xmitr(struct ar933x_uart_port *up)
518 {
519 unsigned int status;
520 unsigned int timeout = 60000;
521
522 /* Wait up to 60ms for the character(s) to be sent. */
523 do {
524 status = ar933x_uart_read(up, AR933X_UART_DATA_REG);
525 if (--timeout == 0)
526 break;
527 udelay(1);
528 } while ((status & AR933X_UART_DATA_TX_CSR) == 0);
529 }
530
531 static void ar933x_uart_console_putchar(struct uart_port *port, int ch)
532 {
533 struct ar933x_uart_port *up =
534 container_of(port, struct ar933x_uart_port, port);
535
536 ar933x_uart_wait_xmitr(up);
537 ar933x_uart_putc(up, ch);
538 }
539
540 static void ar933x_uart_console_write(struct console *co, const char *s,
541 unsigned int count)
542 {
543 struct ar933x_uart_port *up = ar933x_console_ports[co->index];
544 unsigned long flags;
545 unsigned int int_en;
546 int locked = 1;
547
548 local_irq_save(flags);
549
550 if (up->port.sysrq)
551 locked = 0;
552 else if (oops_in_progress)
553 locked = spin_trylock(&up->port.lock);
554 else
555 spin_lock(&up->port.lock);
556
557 /*
558 * First save the IER then disable the interrupts
559 */
560 int_en = ar933x_uart_read(up, AR933X_UART_INT_EN_REG);
561 ar933x_uart_write(up, AR933X_UART_INT_EN_REG, 0);
562
563 uart_console_write(&up->port, s, count, ar933x_uart_console_putchar);
564
565 /*
566 * Finally, wait for transmitter to become empty
567 * and restore the IER
568 */
569 ar933x_uart_wait_xmitr(up);
570 ar933x_uart_write(up, AR933X_UART_INT_EN_REG, int_en);
571
572 ar933x_uart_write(up, AR933X_UART_INT_REG, AR933X_UART_INT_ALLINTS);
573
574 if (locked)
575 spin_unlock(&up->port.lock);
576
577 local_irq_restore(flags);
578 }
579
580 static int ar933x_uart_console_setup(struct console *co, char *options)
581 {
582 struct ar933x_uart_port *up;
583 int baud = 115200;
584 int bits = 8;
585 int parity = 'n';
586 int flow = 'n';
587
588 if (co->index < 0 || co->index >= CONFIG_SERIAL_AR933X_NR_UARTS)
589 return -EINVAL;
590
591 up = ar933x_console_ports[co->index];
592 if (!up)
593 return -ENODEV;
594
595 if (options)
596 uart_parse_options(options, &baud, &parity, &bits, &flow);
597
598 return uart_set_options(&up->port, co, baud, parity, bits, flow);
599 }
600
601 static struct console ar933x_uart_console = {
602 .name = "ttyATH",
603 .write = ar933x_uart_console_write,
604 .device = uart_console_device,
605 .setup = ar933x_uart_console_setup,
606 .flags = CON_PRINTBUFFER,
607 .index = -1,
608 .data = &ar933x_uart_driver,
609 };
610
611 static void ar933x_uart_add_console_port(struct ar933x_uart_port *up)
612 {
613 if (!ar933x_uart_console_enabled())
614 return;
615
616 ar933x_console_ports[up->port.line] = up;
617 }
618
619 static struct uart_driver ar933x_uart_driver = {
620 .owner = THIS_MODULE,
621 .driver_name = DRIVER_NAME,
622 .dev_name = "ttyATH",
623 .nr = CONFIG_SERIAL_AR933X_NR_UARTS,
624 .cons = NULL, /* filled in runtime */
625 };
626
627 static int ar933x_uart_probe(struct platform_device *pdev)
628 {
629 struct ar933x_uart_port *up;
630 struct uart_port *port;
631 struct resource *mem_res;
632 struct resource *irq_res;
633 struct device_node *np;
634 unsigned int baud;
635 int id;
636 int ret;
637
638 np = pdev->dev.of_node;
639 if (config_enabled(CONFIG_OF) && np) {
640 id = of_alias_get_id(np, "serial");
641 if (id < 0) {
642 dev_err(&pdev->dev, "unable to get alias id, err=%d\n",
643 id);
644 return id;
645 }
646 } else {
647 id = pdev->id;
648 if (id == -1)
649 id = 0;
650 }
651
652 if (id >= CONFIG_SERIAL_AR933X_NR_UARTS)
653 return -EINVAL;
654
655 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
656 if (!irq_res) {
657 dev_err(&pdev->dev, "no IRQ resource\n");
658 return -EINVAL;
659 }
660
661 up = devm_kzalloc(&pdev->dev, sizeof(struct ar933x_uart_port),
662 GFP_KERNEL);
663 if (!up)
664 return -ENOMEM;
665
666 up->clk = devm_clk_get(&pdev->dev, "uart");
667 if (IS_ERR(up->clk)) {
668 dev_err(&pdev->dev, "unable to get UART clock\n");
669 return PTR_ERR(up->clk);
670 }
671
672 port = &up->port;
673
674 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
675 port->membase = devm_ioremap_resource(&pdev->dev, mem_res);
676 if (IS_ERR(port->membase))
677 return PTR_ERR(port->membase);
678
679 ret = clk_prepare_enable(up->clk);
680 if (ret)
681 return ret;
682
683 port->uartclk = clk_get_rate(up->clk);
684 if (!port->uartclk) {
685 ret = -EINVAL;
686 goto err_disable_clk;
687 }
688
689 port->mapbase = mem_res->start;
690 port->line = id;
691 port->irq = irq_res->start;
692 port->dev = &pdev->dev;
693 port->type = PORT_AR933X;
694 port->iotype = UPIO_MEM32;
695
696 port->regshift = 2;
697 port->fifosize = AR933X_UART_FIFO_SIZE;
698 port->ops = &ar933x_uart_ops;
699
700 baud = ar933x_uart_get_baud(port->uartclk, AR933X_UART_MAX_SCALE, 1);
701 up->min_baud = max_t(unsigned int, baud, AR933X_UART_MIN_BAUD);
702
703 baud = ar933x_uart_get_baud(port->uartclk, 0, AR933X_UART_MAX_STEP);
704 up->max_baud = min_t(unsigned int, baud, AR933X_UART_MAX_BAUD);
705
706 ar933x_uart_add_console_port(up);
707
708 ret = uart_add_one_port(&ar933x_uart_driver, &up->port);
709 if (ret)
710 goto err_disable_clk;
711
712 platform_set_drvdata(pdev, up);
713 return 0;
714
715 err_disable_clk:
716 clk_disable_unprepare(up->clk);
717 return ret;
718 }
719
720 static int ar933x_uart_remove(struct platform_device *pdev)
721 {
722 struct ar933x_uart_port *up;
723
724 up = platform_get_drvdata(pdev);
725
726 if (up) {
727 uart_remove_one_port(&ar933x_uart_driver, &up->port);
728 clk_disable_unprepare(up->clk);
729 }
730
731 return 0;
732 }
733
734 #ifdef CONFIG_OF
735 static const struct of_device_id ar933x_uart_of_ids[] = {
736 { .compatible = "qca,ar9330-uart" },
737 {},
738 };
739 MODULE_DEVICE_TABLE(of, ar933x_uart_of_ids);
740 #endif
741
742 static struct platform_driver ar933x_uart_platform_driver = {
743 .probe = ar933x_uart_probe,
744 .remove = ar933x_uart_remove,
745 .driver = {
746 .name = DRIVER_NAME,
747 .of_match_table = of_match_ptr(ar933x_uart_of_ids),
748 },
749 };
750
751 static int __init ar933x_uart_init(void)
752 {
753 int ret;
754
755 if (ar933x_uart_console_enabled())
756 ar933x_uart_driver.cons = &ar933x_uart_console;
757
758 ret = uart_register_driver(&ar933x_uart_driver);
759 if (ret)
760 goto err_out;
761
762 ret = platform_driver_register(&ar933x_uart_platform_driver);
763 if (ret)
764 goto err_unregister_uart_driver;
765
766 return 0;
767
768 err_unregister_uart_driver:
769 uart_unregister_driver(&ar933x_uart_driver);
770 err_out:
771 return ret;
772 }
773
774 static void __exit ar933x_uart_exit(void)
775 {
776 platform_driver_unregister(&ar933x_uart_platform_driver);
777 uart_unregister_driver(&ar933x_uart_driver);
778 }
779
780 module_init(ar933x_uart_init);
781 module_exit(ar933x_uart_exit);
782
783 MODULE_DESCRIPTION("Atheros AR933X UART driver");
784 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
785 MODULE_LICENSE("GPL v2");
786 MODULE_ALIAS("platform:" DRIVER_NAME);
Linux with added FPC-III support