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d57f341b GJ |
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/tty.h> | |
21 | #include <linux/tty_flip.h> | |
22 | #include <linux/serial_core.h> | |
23 | #include <linux/serial.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/io.h> | |
26 | #include <linux/irq.h> | |
27 | ||
28 | #include <asm/mach-ath79/ar933x_uart.h> | |
29 | #include <asm/mach-ath79/ar933x_uart_platform.h> | |
30 | ||
31 | #define DRIVER_NAME "ar933x-uart" | |
32 | ||
33 | #define AR933X_DUMMY_STATUS_RD 0x01 | |
34 | ||
35 | static struct uart_driver ar933x_uart_driver; | |
36 | ||
37 | struct ar933x_uart_port { | |
38 | struct uart_port port; | |
39 | unsigned int ier; /* shadow Interrupt Enable Register */ | |
40 | }; | |
41 | ||
42 | static inline unsigned int ar933x_uart_read(struct ar933x_uart_port *up, | |
43 | int offset) | |
44 | { | |
45 | return readl(up->port.membase + offset); | |
46 | } | |
47 | ||
48 | static inline void ar933x_uart_write(struct ar933x_uart_port *up, | |
49 | int offset, unsigned int value) | |
50 | { | |
51 | writel(value, up->port.membase + offset); | |
52 | } | |
53 | ||
54 | static inline void ar933x_uart_rmw(struct ar933x_uart_port *up, | |
55 | unsigned int offset, | |
56 | unsigned int mask, | |
57 | unsigned int val) | |
58 | { | |
59 | unsigned int t; | |
60 | ||
61 | t = ar933x_uart_read(up, offset); | |
62 | t &= ~mask; | |
63 | t |= val; | |
64 | ar933x_uart_write(up, offset, t); | |
65 | } | |
66 | ||
67 | static inline void ar933x_uart_rmw_set(struct ar933x_uart_port *up, | |
68 | unsigned int offset, | |
69 | unsigned int val) | |
70 | { | |
71 | ar933x_uart_rmw(up, offset, 0, val); | |
72 | } | |
73 | ||
74 | static inline void ar933x_uart_rmw_clear(struct ar933x_uart_port *up, | |
75 | unsigned int offset, | |
76 | unsigned int val) | |
77 | { | |
78 | ar933x_uart_rmw(up, offset, val, 0); | |
79 | } | |
80 | ||
81 | static inline void ar933x_uart_start_tx_interrupt(struct ar933x_uart_port *up) | |
82 | { | |
83 | up->ier |= AR933X_UART_INT_TX_EMPTY; | |
84 | ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier); | |
85 | } | |
86 | ||
87 | static inline void ar933x_uart_stop_tx_interrupt(struct ar933x_uart_port *up) | |
88 | { | |
89 | up->ier &= ~AR933X_UART_INT_TX_EMPTY; | |
90 | ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier); | |
91 | } | |
92 | ||
93 | static inline void ar933x_uart_putc(struct ar933x_uart_port *up, int ch) | |
94 | { | |
95 | unsigned int rdata; | |
96 | ||
97 | rdata = ch & AR933X_UART_DATA_TX_RX_MASK; | |
98 | rdata |= AR933X_UART_DATA_TX_CSR; | |
99 | ar933x_uart_write(up, AR933X_UART_DATA_REG, rdata); | |
100 | } | |
101 | ||
102 | static unsigned int ar933x_uart_tx_empty(struct uart_port *port) | |
103 | { | |
104 | struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; | |
105 | unsigned long flags; | |
106 | unsigned int rdata; | |
107 | ||
108 | spin_lock_irqsave(&up->port.lock, flags); | |
109 | rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG); | |
110 | spin_unlock_irqrestore(&up->port.lock, flags); | |
111 | ||
112 | return (rdata & AR933X_UART_DATA_TX_CSR) ? 0 : TIOCSER_TEMT; | |
113 | } | |
114 | ||
115 | static unsigned int ar933x_uart_get_mctrl(struct uart_port *port) | |
116 | { | |
117 | return TIOCM_CAR; | |
118 | } | |
119 | ||
120 | static void ar933x_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
121 | { | |
122 | } | |
123 | ||
124 | static void ar933x_uart_start_tx(struct uart_port *port) | |
125 | { | |
126 | struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; | |
127 | ||
128 | ar933x_uart_start_tx_interrupt(up); | |
129 | } | |
130 | ||
131 | static void ar933x_uart_stop_tx(struct uart_port *port) | |
132 | { | |
133 | struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; | |
134 | ||
135 | ar933x_uart_stop_tx_interrupt(up); | |
136 | } | |
137 | ||
138 | static void ar933x_uart_stop_rx(struct uart_port *port) | |
139 | { | |
140 | struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; | |
141 | ||
142 | up->ier &= ~AR933X_UART_INT_RX_VALID; | |
143 | ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier); | |
144 | } | |
145 | ||
146 | static void ar933x_uart_break_ctl(struct uart_port *port, int break_state) | |
147 | { | |
148 | struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; | |
149 | unsigned long flags; | |
150 | ||
151 | spin_lock_irqsave(&up->port.lock, flags); | |
152 | if (break_state == -1) | |
153 | ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, | |
154 | AR933X_UART_CS_TX_BREAK); | |
155 | else | |
156 | ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG, | |
157 | AR933X_UART_CS_TX_BREAK); | |
158 | spin_unlock_irqrestore(&up->port.lock, flags); | |
159 | } | |
160 | ||
161 | static void ar933x_uart_enable_ms(struct uart_port *port) | |
162 | { | |
163 | } | |
164 | ||
165 | static void ar933x_uart_set_termios(struct uart_port *port, | |
166 | struct ktermios *new, | |
167 | struct ktermios *old) | |
168 | { | |
169 | struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; | |
170 | unsigned int cs; | |
171 | unsigned long flags; | |
172 | unsigned int baud, scale; | |
173 | ||
174 | /* Only CS8 is supported */ | |
175 | new->c_cflag &= ~CSIZE; | |
176 | new->c_cflag |= CS8; | |
177 | ||
178 | /* Only one stop bit is supported */ | |
179 | new->c_cflag &= ~CSTOPB; | |
180 | ||
181 | cs = 0; | |
182 | if (new->c_cflag & PARENB) { | |
183 | if (!(new->c_cflag & PARODD)) | |
184 | cs |= AR933X_UART_CS_PARITY_EVEN; | |
185 | else | |
186 | cs |= AR933X_UART_CS_PARITY_ODD; | |
187 | } else { | |
188 | cs |= AR933X_UART_CS_PARITY_NONE; | |
189 | } | |
190 | ||
191 | /* Mark/space parity is not supported */ | |
192 | new->c_cflag &= ~CMSPAR; | |
193 | ||
194 | baud = uart_get_baud_rate(port, new, old, 0, port->uartclk / 16); | |
195 | scale = (port->uartclk / (16 * baud)) - 1; | |
196 | ||
197 | /* | |
198 | * Ok, we're now changing the port state. Do it with | |
199 | * interrupts disabled. | |
200 | */ | |
201 | spin_lock_irqsave(&up->port.lock, flags); | |
202 | ||
203 | /* Update the per-port timeout. */ | |
204 | uart_update_timeout(port, new->c_cflag, baud); | |
205 | ||
206 | up->port.ignore_status_mask = 0; | |
207 | ||
208 | /* ignore all characters if CREAD is not set */ | |
209 | if ((new->c_cflag & CREAD) == 0) | |
210 | up->port.ignore_status_mask |= AR933X_DUMMY_STATUS_RD; | |
211 | ||
212 | ar933x_uart_write(up, AR933X_UART_CLOCK_REG, | |
213 | scale << AR933X_UART_CLOCK_SCALE_S | 8192); | |
214 | ||
215 | /* setup configuration register */ | |
216 | ar933x_uart_rmw(up, AR933X_UART_CS_REG, AR933X_UART_CS_PARITY_M, cs); | |
217 | ||
218 | /* enable host interrupt */ | |
219 | ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, | |
220 | AR933X_UART_CS_HOST_INT_EN); | |
221 | ||
222 | spin_unlock_irqrestore(&up->port.lock, flags); | |
223 | ||
224 | if (tty_termios_baud_rate(new)) | |
225 | tty_termios_encode_baud_rate(new, baud, baud); | |
226 | } | |
227 | ||
228 | static void ar933x_uart_rx_chars(struct ar933x_uart_port *up) | |
229 | { | |
230 | struct tty_struct *tty; | |
231 | int max_count = 256; | |
232 | ||
233 | tty = tty_port_tty_get(&up->port.state->port); | |
234 | do { | |
235 | unsigned int rdata; | |
236 | unsigned char ch; | |
237 | ||
238 | rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG); | |
239 | if ((rdata & AR933X_UART_DATA_RX_CSR) == 0) | |
240 | break; | |
241 | ||
242 | /* remove the character from the FIFO */ | |
243 | ar933x_uart_write(up, AR933X_UART_DATA_REG, | |
244 | AR933X_UART_DATA_RX_CSR); | |
245 | ||
246 | if (!tty) { | |
247 | /* discard the data if no tty available */ | |
248 | continue; | |
249 | } | |
250 | ||
251 | up->port.icount.rx++; | |
252 | ch = rdata & AR933X_UART_DATA_TX_RX_MASK; | |
253 | ||
254 | if (uart_handle_sysrq_char(&up->port, ch)) | |
255 | continue; | |
256 | ||
257 | if ((up->port.ignore_status_mask & AR933X_DUMMY_STATUS_RD) == 0) | |
258 | tty_insert_flip_char(tty, ch, TTY_NORMAL); | |
259 | } while (max_count-- > 0); | |
260 | ||
261 | if (tty) { | |
262 | tty_flip_buffer_push(tty); | |
263 | tty_kref_put(tty); | |
264 | } | |
265 | } | |
266 | ||
267 | static void ar933x_uart_tx_chars(struct ar933x_uart_port *up) | |
268 | { | |
269 | struct circ_buf *xmit = &up->port.state->xmit; | |
270 | int count; | |
271 | ||
272 | if (uart_tx_stopped(&up->port)) | |
273 | return; | |
274 | ||
275 | count = up->port.fifosize; | |
276 | do { | |
277 | unsigned int rdata; | |
278 | ||
279 | rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG); | |
280 | if ((rdata & AR933X_UART_DATA_TX_CSR) == 0) | |
281 | break; | |
282 | ||
283 | if (up->port.x_char) { | |
284 | ar933x_uart_putc(up, up->port.x_char); | |
285 | up->port.icount.tx++; | |
286 | up->port.x_char = 0; | |
287 | continue; | |
288 | } | |
289 | ||
290 | if (uart_circ_empty(xmit)) | |
291 | break; | |
292 | ||
293 | ar933x_uart_putc(up, xmit->buf[xmit->tail]); | |
294 | ||
295 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
296 | up->port.icount.tx++; | |
297 | } while (--count > 0); | |
298 | ||
299 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
300 | uart_write_wakeup(&up->port); | |
301 | ||
302 | if (!uart_circ_empty(xmit)) | |
303 | ar933x_uart_start_tx_interrupt(up); | |
304 | } | |
305 | ||
306 | static irqreturn_t ar933x_uart_interrupt(int irq, void *dev_id) | |
307 | { | |
308 | struct ar933x_uart_port *up = dev_id; | |
309 | unsigned int status; | |
310 | ||
311 | status = ar933x_uart_read(up, AR933X_UART_CS_REG); | |
312 | if ((status & AR933X_UART_CS_HOST_INT) == 0) | |
313 | return IRQ_NONE; | |
314 | ||
315 | spin_lock(&up->port.lock); | |
316 | ||
317 | status = ar933x_uart_read(up, AR933X_UART_INT_REG); | |
318 | status &= ar933x_uart_read(up, AR933X_UART_INT_EN_REG); | |
319 | ||
320 | if (status & AR933X_UART_INT_RX_VALID) { | |
321 | ar933x_uart_write(up, AR933X_UART_INT_REG, | |
322 | AR933X_UART_INT_RX_VALID); | |
323 | ar933x_uart_rx_chars(up); | |
324 | } | |
325 | ||
326 | if (status & AR933X_UART_INT_TX_EMPTY) { | |
327 | ar933x_uart_write(up, AR933X_UART_INT_REG, | |
328 | AR933X_UART_INT_TX_EMPTY); | |
329 | ar933x_uart_stop_tx_interrupt(up); | |
330 | ar933x_uart_tx_chars(up); | |
331 | } | |
332 | ||
333 | spin_unlock(&up->port.lock); | |
334 | ||
335 | return IRQ_HANDLED; | |
336 | } | |
337 | ||
338 | static int ar933x_uart_startup(struct uart_port *port) | |
339 | { | |
340 | struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; | |
341 | unsigned long flags; | |
342 | int ret; | |
343 | ||
344 | ret = request_irq(up->port.irq, ar933x_uart_interrupt, | |
345 | up->port.irqflags, dev_name(up->port.dev), up); | |
346 | if (ret) | |
347 | return ret; | |
348 | ||
349 | spin_lock_irqsave(&up->port.lock, flags); | |
350 | ||
351 | /* Enable HOST interrupts */ | |
352 | ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, | |
353 | AR933X_UART_CS_HOST_INT_EN); | |
354 | ||
355 | /* Enable RX interrupts */ | |
356 | up->ier = AR933X_UART_INT_RX_VALID; | |
357 | ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier); | |
358 | ||
359 | spin_unlock_irqrestore(&up->port.lock, flags); | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
364 | static void ar933x_uart_shutdown(struct uart_port *port) | |
365 | { | |
366 | struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; | |
367 | ||
368 | /* Disable all interrupts */ | |
369 | up->ier = 0; | |
370 | ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier); | |
371 | ||
372 | /* Disable break condition */ | |
373 | ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG, | |
374 | AR933X_UART_CS_TX_BREAK); | |
375 | ||
376 | free_irq(up->port.irq, up); | |
377 | } | |
378 | ||
379 | static const char *ar933x_uart_type(struct uart_port *port) | |
380 | { | |
381 | return (port->type == PORT_AR933X) ? "AR933X UART" : NULL; | |
382 | } | |
383 | ||
384 | static void ar933x_uart_release_port(struct uart_port *port) | |
385 | { | |
386 | /* Nothing to release ... */ | |
387 | } | |
388 | ||
389 | static int ar933x_uart_request_port(struct uart_port *port) | |
390 | { | |
391 | /* UARTs always present */ | |
392 | return 0; | |
393 | } | |
394 | ||
395 | static void ar933x_uart_config_port(struct uart_port *port, int flags) | |
396 | { | |
397 | if (flags & UART_CONFIG_TYPE) | |
398 | port->type = PORT_AR933X; | |
399 | } | |
400 | ||
401 | static int ar933x_uart_verify_port(struct uart_port *port, | |
402 | struct serial_struct *ser) | |
403 | { | |
404 | if (ser->type != PORT_UNKNOWN && | |
405 | ser->type != PORT_AR933X) | |
406 | return -EINVAL; | |
407 | ||
408 | if (ser->irq < 0 || ser->irq >= NR_IRQS) | |
409 | return -EINVAL; | |
410 | ||
411 | if (ser->baud_base < 28800) | |
412 | return -EINVAL; | |
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
417 | static struct uart_ops ar933x_uart_ops = { | |
418 | .tx_empty = ar933x_uart_tx_empty, | |
419 | .set_mctrl = ar933x_uart_set_mctrl, | |
420 | .get_mctrl = ar933x_uart_get_mctrl, | |
421 | .stop_tx = ar933x_uart_stop_tx, | |
422 | .start_tx = ar933x_uart_start_tx, | |
423 | .stop_rx = ar933x_uart_stop_rx, | |
424 | .enable_ms = ar933x_uart_enable_ms, | |
425 | .break_ctl = ar933x_uart_break_ctl, | |
426 | .startup = ar933x_uart_startup, | |
427 | .shutdown = ar933x_uart_shutdown, | |
428 | .set_termios = ar933x_uart_set_termios, | |
429 | .type = ar933x_uart_type, | |
430 | .release_port = ar933x_uart_release_port, | |
431 | .request_port = ar933x_uart_request_port, | |
432 | .config_port = ar933x_uart_config_port, | |
433 | .verify_port = ar933x_uart_verify_port, | |
434 | }; | |
435 | ||
436 | #ifdef CONFIG_SERIAL_AR933X_CONSOLE | |
437 | ||
438 | static struct ar933x_uart_port * | |
439 | ar933x_console_ports[CONFIG_SERIAL_AR933X_NR_UARTS]; | |
440 | ||
441 | static void ar933x_uart_wait_xmitr(struct ar933x_uart_port *up) | |
442 | { | |
443 | unsigned int status; | |
444 | unsigned int timeout = 60000; | |
445 | ||
446 | /* Wait up to 60ms for the character(s) to be sent. */ | |
447 | do { | |
448 | status = ar933x_uart_read(up, AR933X_UART_DATA_REG); | |
449 | if (--timeout == 0) | |
450 | break; | |
451 | udelay(1); | |
452 | } while ((status & AR933X_UART_DATA_TX_CSR) == 0); | |
453 | } | |
454 | ||
455 | static void ar933x_uart_console_putchar(struct uart_port *port, int ch) | |
456 | { | |
457 | struct ar933x_uart_port *up = (struct ar933x_uart_port *) port; | |
458 | ||
459 | ar933x_uart_wait_xmitr(up); | |
460 | ar933x_uart_putc(up, ch); | |
461 | } | |
462 | ||
463 | static void ar933x_uart_console_write(struct console *co, const char *s, | |
464 | unsigned int count) | |
465 | { | |
466 | struct ar933x_uart_port *up = ar933x_console_ports[co->index]; | |
467 | unsigned long flags; | |
468 | unsigned int int_en; | |
469 | int locked = 1; | |
470 | ||
471 | local_irq_save(flags); | |
472 | ||
473 | if (up->port.sysrq) | |
474 | locked = 0; | |
475 | else if (oops_in_progress) | |
476 | locked = spin_trylock(&up->port.lock); | |
477 | else | |
478 | spin_lock(&up->port.lock); | |
479 | ||
480 | /* | |
481 | * First save the IER then disable the interrupts | |
482 | */ | |
483 | int_en = ar933x_uart_read(up, AR933X_UART_INT_EN_REG); | |
484 | ar933x_uart_write(up, AR933X_UART_INT_EN_REG, 0); | |
485 | ||
486 | uart_console_write(&up->port, s, count, ar933x_uart_console_putchar); | |
487 | ||
488 | /* | |
489 | * Finally, wait for transmitter to become empty | |
490 | * and restore the IER | |
491 | */ | |
492 | ar933x_uart_wait_xmitr(up); | |
493 | ar933x_uart_write(up, AR933X_UART_INT_EN_REG, int_en); | |
494 | ||
495 | ar933x_uart_write(up, AR933X_UART_INT_REG, AR933X_UART_INT_ALLINTS); | |
496 | ||
497 | if (locked) | |
498 | spin_unlock(&up->port.lock); | |
499 | ||
500 | local_irq_restore(flags); | |
501 | } | |
502 | ||
503 | static int ar933x_uart_console_setup(struct console *co, char *options) | |
504 | { | |
505 | struct ar933x_uart_port *up; | |
506 | int baud = 115200; | |
507 | int bits = 8; | |
508 | int parity = 'n'; | |
509 | int flow = 'n'; | |
510 | ||
511 | if (co->index < 0 || co->index >= CONFIG_SERIAL_AR933X_NR_UARTS) | |
512 | return -EINVAL; | |
513 | ||
514 | up = ar933x_console_ports[co->index]; | |
515 | if (!up) | |
516 | return -ENODEV; | |
517 | ||
518 | if (options) | |
519 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
520 | ||
521 | return uart_set_options(&up->port, co, baud, parity, bits, flow); | |
522 | } | |
523 | ||
524 | static struct console ar933x_uart_console = { | |
525 | .name = "ttyATH", | |
526 | .write = ar933x_uart_console_write, | |
527 | .device = uart_console_device, | |
528 | .setup = ar933x_uart_console_setup, | |
529 | .flags = CON_PRINTBUFFER, | |
530 | .index = -1, | |
531 | .data = &ar933x_uart_driver, | |
532 | }; | |
533 | ||
534 | static void ar933x_uart_add_console_port(struct ar933x_uart_port *up) | |
535 | { | |
536 | ar933x_console_ports[up->port.line] = up; | |
537 | } | |
538 | ||
539 | #define AR933X_SERIAL_CONSOLE (&ar933x_uart_console) | |
540 | ||
541 | #else | |
542 | ||
543 | static inline void ar933x_uart_add_console_port(struct ar933x_uart_port *up) {} | |
544 | ||
545 | #define AR933X_SERIAL_CONSOLE NULL | |
546 | ||
547 | #endif /* CONFIG_SERIAL_AR933X_CONSOLE */ | |
548 | ||
549 | static struct uart_driver ar933x_uart_driver = { | |
550 | .owner = THIS_MODULE, | |
551 | .driver_name = DRIVER_NAME, | |
552 | .dev_name = "ttyATH", | |
553 | .nr = CONFIG_SERIAL_AR933X_NR_UARTS, | |
554 | .cons = AR933X_SERIAL_CONSOLE, | |
555 | }; | |
556 | ||
557 | static int __devinit ar933x_uart_probe(struct platform_device *pdev) | |
558 | { | |
559 | struct ar933x_uart_platform_data *pdata; | |
560 | struct ar933x_uart_port *up; | |
561 | struct uart_port *port; | |
562 | struct resource *mem_res; | |
563 | struct resource *irq_res; | |
564 | int id; | |
565 | int ret; | |
566 | ||
567 | pdata = pdev->dev.platform_data; | |
568 | if (!pdata) | |
569 | return -EINVAL; | |
570 | ||
571 | id = pdev->id; | |
572 | if (id == -1) | |
573 | id = 0; | |
574 | ||
575 | if (id > CONFIG_SERIAL_AR933X_NR_UARTS) | |
576 | return -EINVAL; | |
577 | ||
578 | mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
579 | if (!mem_res) { | |
580 | dev_err(&pdev->dev, "no MEM resource\n"); | |
581 | return -EINVAL; | |
582 | } | |
583 | ||
584 | irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
585 | if (!irq_res) { | |
586 | dev_err(&pdev->dev, "no IRQ resource\n"); | |
587 | return -EINVAL; | |
588 | } | |
589 | ||
590 | up = kzalloc(sizeof(struct ar933x_uart_port), GFP_KERNEL); | |
591 | if (!up) | |
592 | return -ENOMEM; | |
593 | ||
594 | port = &up->port; | |
595 | port->mapbase = mem_res->start; | |
596 | ||
597 | port->membase = ioremap(mem_res->start, AR933X_UART_REGS_SIZE); | |
598 | if (!port->membase) { | |
599 | ret = -ENOMEM; | |
600 | goto err_free_up; | |
601 | } | |
602 | ||
603 | port->line = id; | |
604 | port->irq = irq_res->start; | |
605 | port->dev = &pdev->dev; | |
606 | port->type = PORT_AR933X; | |
607 | port->iotype = UPIO_MEM32; | |
608 | port->uartclk = pdata->uartclk; | |
609 | ||
610 | port->regshift = 2; | |
611 | port->fifosize = AR933X_UART_FIFO_SIZE; | |
612 | port->ops = &ar933x_uart_ops; | |
613 | ||
614 | ar933x_uart_add_console_port(up); | |
615 | ||
616 | ret = uart_add_one_port(&ar933x_uart_driver, &up->port); | |
617 | if (ret) | |
618 | goto err_unmap; | |
619 | ||
620 | platform_set_drvdata(pdev, up); | |
621 | return 0; | |
622 | ||
623 | err_unmap: | |
624 | iounmap(up->port.membase); | |
625 | err_free_up: | |
626 | kfree(up); | |
627 | return ret; | |
628 | } | |
629 | ||
630 | static int __devexit ar933x_uart_remove(struct platform_device *pdev) | |
631 | { | |
632 | struct ar933x_uart_port *up; | |
633 | ||
634 | up = platform_get_drvdata(pdev); | |
635 | platform_set_drvdata(pdev, NULL); | |
636 | ||
637 | if (up) { | |
638 | uart_remove_one_port(&ar933x_uart_driver, &up->port); | |
639 | iounmap(up->port.membase); | |
640 | kfree(up); | |
641 | } | |
642 | ||
643 | return 0; | |
644 | } | |
645 | ||
646 | static struct platform_driver ar933x_uart_platform_driver = { | |
647 | .probe = ar933x_uart_probe, | |
648 | .remove = __devexit_p(ar933x_uart_remove), | |
649 | .driver = { | |
650 | .name = DRIVER_NAME, | |
651 | .owner = THIS_MODULE, | |
652 | }, | |
653 | }; | |
654 | ||
655 | static int __init ar933x_uart_init(void) | |
656 | { | |
657 | int ret; | |
658 | ||
659 | ar933x_uart_driver.nr = CONFIG_SERIAL_AR933X_NR_UARTS; | |
660 | ret = uart_register_driver(&ar933x_uart_driver); | |
661 | if (ret) | |
662 | goto err_out; | |
663 | ||
664 | ret = platform_driver_register(&ar933x_uart_platform_driver); | |
665 | if (ret) | |
666 | goto err_unregister_uart_driver; | |
667 | ||
668 | return 0; | |
669 | ||
670 | err_unregister_uart_driver: | |
671 | uart_unregister_driver(&ar933x_uart_driver); | |
672 | err_out: | |
673 | return ret; | |
674 | } | |
675 | ||
676 | static void __exit ar933x_uart_exit(void) | |
677 | { | |
678 | platform_driver_unregister(&ar933x_uart_platform_driver); | |
679 | uart_unregister_driver(&ar933x_uart_driver); | |
680 | } | |
681 | ||
682 | module_init(ar933x_uart_init); | |
683 | module_exit(ar933x_uart_exit); | |
684 | ||
685 | MODULE_DESCRIPTION("Atheros AR933X UART driver"); | |
686 | MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); | |
687 | MODULE_LICENSE("GPL v2"); | |
688 | MODULE_ALIAS("platform:" DRIVER_NAME); |