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d4ac42a5 KG |
1 | /* |
2 | * Driver for GRLIB serial ports (APBUART) | |
3 | * | |
4 | * Based on linux/drivers/serial/amba.c | |
5 | * | |
6 | * Copyright (C) 2000 Deep Blue Solutions Ltd. | |
7 | * Copyright (C) 2003 Konrad Eisele <eiselekd@web.de> | |
8 | * Copyright (C) 2006 Daniel Hellstrom <daniel@gaisler.com>, Aeroflex Gaisler AB | |
9 | * Copyright (C) 2008 Gilead Kutnick <kutnickg@zin-tech.com> | |
10 | * Copyright (C) 2009 Kristoffer Glembo <kristoffer@gaisler.com>, Aeroflex Gaisler AB | |
11 | */ | |
12 | ||
13 | #if defined(CONFIG_SERIAL_GRLIB_GAISLER_APBUART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) | |
14 | #define SUPPORT_SYSRQ | |
15 | #endif | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/tty.h> | |
19 | #include <linux/ioport.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/serial.h> | |
22 | #include <linux/console.h> | |
23 | #include <linux/sysrq.h> | |
24 | #include <linux/kthread.h> | |
25 | #include <linux/device.h> | |
26 | #include <linux/of.h> | |
27 | #include <linux/of_device.h> | |
ddaf1b27 | 28 | #include <linux/of_platform.h> |
d4ac42a5 KG |
29 | #include <linux/platform_device.h> |
30 | #include <linux/io.h> | |
31 | #include <linux/serial_core.h> | |
32 | #include <asm/irq.h> | |
d4ac42a5 KG |
33 | |
34 | #include "apbuart.h" | |
35 | ||
36 | #define SERIAL_APBUART_MAJOR TTY_MAJOR | |
37 | #define SERIAL_APBUART_MINOR 64 | |
38 | #define UART_DUMMY_RSR_RX 0x8000 /* for ignore all read */ | |
39 | ||
40 | static void apbuart_tx_chars(struct uart_port *port); | |
41 | ||
42 | static void apbuart_stop_tx(struct uart_port *port) | |
43 | { | |
44 | unsigned int cr; | |
45 | ||
46 | cr = UART_GET_CTRL(port); | |
47 | cr &= ~UART_CTRL_TI; | |
48 | UART_PUT_CTRL(port, cr); | |
49 | } | |
50 | ||
51 | static void apbuart_start_tx(struct uart_port *port) | |
52 | { | |
53 | unsigned int cr; | |
54 | ||
55 | cr = UART_GET_CTRL(port); | |
56 | cr |= UART_CTRL_TI; | |
57 | UART_PUT_CTRL(port, cr); | |
58 | ||
59 | if (UART_GET_STATUS(port) & UART_STATUS_THE) | |
60 | apbuart_tx_chars(port); | |
61 | } | |
62 | ||
63 | static void apbuart_stop_rx(struct uart_port *port) | |
64 | { | |
65 | unsigned int cr; | |
66 | ||
67 | cr = UART_GET_CTRL(port); | |
68 | cr &= ~(UART_CTRL_RI); | |
69 | UART_PUT_CTRL(port, cr); | |
70 | } | |
71 | ||
72 | static void apbuart_enable_ms(struct uart_port *port) | |
73 | { | |
74 | /* No modem status change interrupts for APBUART */ | |
75 | } | |
76 | ||
77 | static void apbuart_rx_chars(struct uart_port *port) | |
78 | { | |
79 | struct tty_struct *tty = port->state->port.tty; | |
80 | unsigned int status, ch, rsr, flag; | |
81 | unsigned int max_chars = port->fifosize; | |
82 | ||
83 | status = UART_GET_STATUS(port); | |
84 | ||
85 | while (UART_RX_DATA(status) && (max_chars--)) { | |
86 | ||
87 | ch = UART_GET_CHAR(port); | |
88 | flag = TTY_NORMAL; | |
89 | ||
90 | port->icount.rx++; | |
91 | ||
92 | rsr = UART_GET_STATUS(port) | UART_DUMMY_RSR_RX; | |
93 | UART_PUT_STATUS(port, 0); | |
94 | if (rsr & UART_STATUS_ERR) { | |
95 | ||
96 | if (rsr & UART_STATUS_BR) { | |
97 | rsr &= ~(UART_STATUS_FE | UART_STATUS_PE); | |
98 | port->icount.brk++; | |
99 | if (uart_handle_break(port)) | |
100 | goto ignore_char; | |
101 | } else if (rsr & UART_STATUS_PE) { | |
102 | port->icount.parity++; | |
103 | } else if (rsr & UART_STATUS_FE) { | |
104 | port->icount.frame++; | |
105 | } | |
106 | if (rsr & UART_STATUS_OE) | |
107 | port->icount.overrun++; | |
108 | ||
109 | rsr &= port->read_status_mask; | |
110 | ||
111 | if (rsr & UART_STATUS_PE) | |
112 | flag = TTY_PARITY; | |
113 | else if (rsr & UART_STATUS_FE) | |
114 | flag = TTY_FRAME; | |
115 | } | |
116 | ||
117 | if (uart_handle_sysrq_char(port, ch)) | |
118 | goto ignore_char; | |
119 | ||
120 | uart_insert_char(port, rsr, UART_STATUS_OE, ch, flag); | |
121 | ||
122 | ||
123 | ignore_char: | |
124 | status = UART_GET_STATUS(port); | |
125 | } | |
126 | ||
127 | tty_flip_buffer_push(tty); | |
128 | } | |
129 | ||
130 | static void apbuart_tx_chars(struct uart_port *port) | |
131 | { | |
132 | struct circ_buf *xmit = &port->state->xmit; | |
133 | int count; | |
134 | ||
135 | if (port->x_char) { | |
136 | UART_PUT_CHAR(port, port->x_char); | |
137 | port->icount.tx++; | |
138 | port->x_char = 0; | |
139 | return; | |
140 | } | |
141 | ||
142 | if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { | |
143 | apbuart_stop_tx(port); | |
144 | return; | |
145 | } | |
146 | ||
147 | /* amba: fill FIFO */ | |
148 | count = port->fifosize >> 1; | |
149 | do { | |
150 | UART_PUT_CHAR(port, xmit->buf[xmit->tail]); | |
151 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
152 | port->icount.tx++; | |
153 | if (uart_circ_empty(xmit)) | |
154 | break; | |
155 | } while (--count > 0); | |
156 | ||
157 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
158 | uart_write_wakeup(port); | |
159 | ||
160 | if (uart_circ_empty(xmit)) | |
161 | apbuart_stop_tx(port); | |
162 | } | |
163 | ||
164 | static irqreturn_t apbuart_int(int irq, void *dev_id) | |
165 | { | |
166 | struct uart_port *port = dev_id; | |
167 | unsigned int status; | |
168 | ||
169 | spin_lock(&port->lock); | |
170 | ||
171 | status = UART_GET_STATUS(port); | |
172 | if (status & UART_STATUS_DR) | |
173 | apbuart_rx_chars(port); | |
174 | if (status & UART_STATUS_THE) | |
175 | apbuart_tx_chars(port); | |
176 | ||
177 | spin_unlock(&port->lock); | |
178 | ||
179 | return IRQ_HANDLED; | |
180 | } | |
181 | ||
182 | static unsigned int apbuart_tx_empty(struct uart_port *port) | |
183 | { | |
184 | unsigned int status = UART_GET_STATUS(port); | |
185 | return status & UART_STATUS_THE ? TIOCSER_TEMT : 0; | |
186 | } | |
187 | ||
188 | static unsigned int apbuart_get_mctrl(struct uart_port *port) | |
189 | { | |
190 | /* The GRLIB APBUART handles flow control in hardware */ | |
191 | return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; | |
192 | } | |
193 | ||
194 | static void apbuart_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
195 | { | |
196 | /* The GRLIB APBUART handles flow control in hardware */ | |
197 | } | |
198 | ||
199 | static void apbuart_break_ctl(struct uart_port *port, int break_state) | |
200 | { | |
201 | /* We don't support sending break */ | |
202 | } | |
203 | ||
204 | static int apbuart_startup(struct uart_port *port) | |
205 | { | |
206 | int retval; | |
207 | unsigned int cr; | |
208 | ||
209 | /* Allocate the IRQ */ | |
210 | retval = request_irq(port->irq, apbuart_int, 0, "apbuart", port); | |
211 | if (retval) | |
212 | return retval; | |
213 | ||
214 | /* Finally, enable interrupts */ | |
215 | cr = UART_GET_CTRL(port); | |
216 | UART_PUT_CTRL(port, | |
217 | cr | UART_CTRL_RE | UART_CTRL_TE | | |
218 | UART_CTRL_RI | UART_CTRL_TI); | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
223 | static void apbuart_shutdown(struct uart_port *port) | |
224 | { | |
225 | unsigned int cr; | |
226 | ||
227 | /* disable all interrupts, disable the port */ | |
228 | cr = UART_GET_CTRL(port); | |
229 | UART_PUT_CTRL(port, | |
230 | cr & ~(UART_CTRL_RE | UART_CTRL_TE | | |
231 | UART_CTRL_RI | UART_CTRL_TI)); | |
232 | ||
233 | /* Free the interrupt */ | |
234 | free_irq(port->irq, port); | |
235 | } | |
236 | ||
237 | static void apbuart_set_termios(struct uart_port *port, | |
238 | struct ktermios *termios, struct ktermios *old) | |
239 | { | |
240 | unsigned int cr; | |
241 | unsigned long flags; | |
242 | unsigned int baud, quot; | |
243 | ||
244 | /* Ask the core to calculate the divisor for us. */ | |
245 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16); | |
246 | if (baud == 0) | |
247 | panic("invalid baudrate %i\n", port->uartclk / 16); | |
248 | ||
249 | /* uart_get_divisor calc a *16 uart freq, apbuart is *8 */ | |
250 | quot = (uart_get_divisor(port, baud)) * 2; | |
251 | cr = UART_GET_CTRL(port); | |
252 | cr &= ~(UART_CTRL_PE | UART_CTRL_PS); | |
253 | ||
254 | if (termios->c_cflag & PARENB) { | |
255 | cr |= UART_CTRL_PE; | |
256 | if ((termios->c_cflag & PARODD)) | |
257 | cr |= UART_CTRL_PS; | |
258 | } | |
259 | ||
260 | /* Enable flow control. */ | |
261 | if (termios->c_cflag & CRTSCTS) | |
262 | cr |= UART_CTRL_FL; | |
263 | ||
264 | spin_lock_irqsave(&port->lock, flags); | |
265 | ||
266 | /* Update the per-port timeout. */ | |
267 | uart_update_timeout(port, termios->c_cflag, baud); | |
268 | ||
269 | port->read_status_mask = UART_STATUS_OE; | |
270 | if (termios->c_iflag & INPCK) | |
271 | port->read_status_mask |= UART_STATUS_FE | UART_STATUS_PE; | |
272 | ||
273 | /* Characters to ignore */ | |
274 | port->ignore_status_mask = 0; | |
275 | if (termios->c_iflag & IGNPAR) | |
276 | port->ignore_status_mask |= UART_STATUS_FE | UART_STATUS_PE; | |
277 | ||
278 | /* Ignore all characters if CREAD is not set. */ | |
279 | if ((termios->c_cflag & CREAD) == 0) | |
280 | port->ignore_status_mask |= UART_DUMMY_RSR_RX; | |
281 | ||
282 | /* Set baud rate */ | |
283 | quot -= 1; | |
284 | UART_PUT_SCAL(port, quot); | |
285 | UART_PUT_CTRL(port, cr); | |
286 | ||
287 | spin_unlock_irqrestore(&port->lock, flags); | |
288 | } | |
289 | ||
290 | static const char *apbuart_type(struct uart_port *port) | |
291 | { | |
292 | return port->type == PORT_APBUART ? "GRLIB/APBUART" : NULL; | |
293 | } | |
294 | ||
295 | static void apbuart_release_port(struct uart_port *port) | |
296 | { | |
297 | release_mem_region(port->mapbase, 0x100); | |
298 | } | |
299 | ||
300 | static int apbuart_request_port(struct uart_port *port) | |
301 | { | |
302 | return request_mem_region(port->mapbase, 0x100, "grlib-apbuart") | |
303 | != NULL ? 0 : -EBUSY; | |
304 | return 0; | |
305 | } | |
306 | ||
307 | /* Configure/autoconfigure the port */ | |
308 | static void apbuart_config_port(struct uart_port *port, int flags) | |
309 | { | |
310 | if (flags & UART_CONFIG_TYPE) { | |
311 | port->type = PORT_APBUART; | |
312 | apbuart_request_port(port); | |
313 | } | |
314 | } | |
315 | ||
316 | /* Verify the new serial_struct (for TIOCSSERIAL) */ | |
317 | static int apbuart_verify_port(struct uart_port *port, | |
318 | struct serial_struct *ser) | |
319 | { | |
320 | int ret = 0; | |
321 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_APBUART) | |
322 | ret = -EINVAL; | |
323 | if (ser->irq < 0 || ser->irq >= NR_IRQS) | |
324 | ret = -EINVAL; | |
325 | if (ser->baud_base < 9600) | |
326 | ret = -EINVAL; | |
327 | return ret; | |
328 | } | |
329 | ||
330 | static struct uart_ops grlib_apbuart_ops = { | |
331 | .tx_empty = apbuart_tx_empty, | |
332 | .set_mctrl = apbuart_set_mctrl, | |
333 | .get_mctrl = apbuart_get_mctrl, | |
334 | .stop_tx = apbuart_stop_tx, | |
335 | .start_tx = apbuart_start_tx, | |
336 | .stop_rx = apbuart_stop_rx, | |
337 | .enable_ms = apbuart_enable_ms, | |
338 | .break_ctl = apbuart_break_ctl, | |
339 | .startup = apbuart_startup, | |
340 | .shutdown = apbuart_shutdown, | |
341 | .set_termios = apbuart_set_termios, | |
342 | .type = apbuart_type, | |
343 | .release_port = apbuart_release_port, | |
344 | .request_port = apbuart_request_port, | |
345 | .config_port = apbuart_config_port, | |
346 | .verify_port = apbuart_verify_port, | |
347 | }; | |
348 | ||
349 | static struct uart_port grlib_apbuart_ports[UART_NR]; | |
350 | static struct device_node *grlib_apbuart_nodes[UART_NR]; | |
351 | ||
352 | static int apbuart_scan_fifo_size(struct uart_port *port, int portnumber) | |
353 | { | |
354 | int ctrl, loop = 0; | |
355 | int status; | |
356 | int fifosize; | |
357 | unsigned long flags; | |
358 | ||
359 | ctrl = UART_GET_CTRL(port); | |
360 | ||
361 | /* | |
362 | * Enable the transceiver and wait for it to be ready to send data. | |
363 | * Clear interrupts so that this process will not be externally | |
364 | * interrupted in the middle (which can cause the transceiver to | |
365 | * drain prematurely). | |
366 | */ | |
367 | ||
368 | local_irq_save(flags); | |
369 | ||
370 | UART_PUT_CTRL(port, ctrl | UART_CTRL_TE); | |
371 | ||
372 | while (!UART_TX_READY(UART_GET_STATUS(port))) | |
373 | loop++; | |
374 | ||
375 | /* | |
376 | * Disable the transceiver so data isn't actually sent during the | |
377 | * actual test. | |
378 | */ | |
379 | ||
380 | UART_PUT_CTRL(port, ctrl & ~(UART_CTRL_TE)); | |
381 | ||
382 | fifosize = 1; | |
383 | UART_PUT_CHAR(port, 0); | |
384 | ||
385 | /* | |
386 | * So long as transmitting a character increments the tranceivier FIFO | |
387 | * length the FIFO must be at least that big. These bytes will | |
388 | * automatically drain off of the FIFO. | |
389 | */ | |
390 | ||
391 | status = UART_GET_STATUS(port); | |
392 | while (((status >> 20) & 0x3F) == fifosize) { | |
393 | fifosize++; | |
394 | UART_PUT_CHAR(port, 0); | |
395 | status = UART_GET_STATUS(port); | |
396 | } | |
397 | ||
398 | fifosize--; | |
399 | ||
400 | UART_PUT_CTRL(port, ctrl); | |
401 | local_irq_restore(flags); | |
402 | ||
403 | if (fifosize == 0) | |
404 | fifosize = 1; | |
405 | ||
406 | return fifosize; | |
407 | } | |
408 | ||
409 | static void apbuart_flush_fifo(struct uart_port *port) | |
410 | { | |
411 | int i; | |
412 | ||
413 | for (i = 0; i < port->fifosize; i++) | |
414 | UART_GET_CHAR(port); | |
415 | } | |
416 | ||
417 | ||
418 | /* ======================================================================== */ | |
419 | /* Console driver, if enabled */ | |
420 | /* ======================================================================== */ | |
421 | ||
422 | #ifdef CONFIG_SERIAL_GRLIB_GAISLER_APBUART_CONSOLE | |
423 | ||
424 | static void apbuart_console_putchar(struct uart_port *port, int ch) | |
425 | { | |
426 | unsigned int status; | |
427 | do { | |
428 | status = UART_GET_STATUS(port); | |
429 | } while (!UART_TX_READY(status)); | |
430 | UART_PUT_CHAR(port, ch); | |
431 | } | |
432 | ||
433 | static void | |
434 | apbuart_console_write(struct console *co, const char *s, unsigned int count) | |
435 | { | |
436 | struct uart_port *port = &grlib_apbuart_ports[co->index]; | |
437 | unsigned int status, old_cr, new_cr; | |
438 | ||
439 | /* First save the CR then disable the interrupts */ | |
440 | old_cr = UART_GET_CTRL(port); | |
441 | new_cr = old_cr & ~(UART_CTRL_RI | UART_CTRL_TI); | |
442 | UART_PUT_CTRL(port, new_cr); | |
443 | ||
444 | uart_console_write(port, s, count, apbuart_console_putchar); | |
445 | ||
446 | /* | |
447 | * Finally, wait for transmitter to become empty | |
448 | * and restore the TCR | |
449 | */ | |
450 | do { | |
451 | status = UART_GET_STATUS(port); | |
452 | } while (!UART_TX_READY(status)); | |
453 | UART_PUT_CTRL(port, old_cr); | |
454 | } | |
455 | ||
456 | static void __init | |
457 | apbuart_console_get_options(struct uart_port *port, int *baud, | |
458 | int *parity, int *bits) | |
459 | { | |
460 | if (UART_GET_CTRL(port) & (UART_CTRL_RE | UART_CTRL_TE)) { | |
461 | ||
462 | unsigned int quot, status; | |
463 | status = UART_GET_STATUS(port); | |
464 | ||
465 | *parity = 'n'; | |
466 | if (status & UART_CTRL_PE) { | |
467 | if ((status & UART_CTRL_PS) == 0) | |
468 | *parity = 'e'; | |
469 | else | |
470 | *parity = 'o'; | |
471 | } | |
472 | ||
473 | *bits = 8; | |
474 | quot = UART_GET_SCAL(port) / 8; | |
475 | *baud = port->uartclk / (16 * (quot + 1)); | |
476 | } | |
477 | } | |
478 | ||
479 | static int __init apbuart_console_setup(struct console *co, char *options) | |
480 | { | |
481 | struct uart_port *port; | |
482 | int baud = 38400; | |
483 | int bits = 8; | |
484 | int parity = 'n'; | |
485 | int flow = 'n'; | |
486 | ||
487 | pr_debug("apbuart_console_setup co=%p, co->index=%i, options=%s\n", | |
488 | co, co->index, options); | |
489 | ||
490 | /* | |
491 | * Check whether an invalid uart number has been specified, and | |
492 | * if so, search for the first available port that does have | |
493 | * console support. | |
494 | */ | |
495 | if (co->index >= grlib_apbuart_port_nr) | |
496 | co->index = 0; | |
497 | ||
498 | port = &grlib_apbuart_ports[co->index]; | |
499 | ||
500 | spin_lock_init(&port->lock); | |
501 | ||
502 | if (options) | |
503 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
504 | else | |
505 | apbuart_console_get_options(port, &baud, &parity, &bits); | |
506 | ||
507 | return uart_set_options(port, co, baud, parity, bits, flow); | |
508 | } | |
509 | ||
510 | static struct uart_driver grlib_apbuart_driver; | |
511 | ||
512 | static struct console grlib_apbuart_console = { | |
513 | .name = "ttyS", | |
514 | .write = apbuart_console_write, | |
515 | .device = uart_console_device, | |
516 | .setup = apbuart_console_setup, | |
517 | .flags = CON_PRINTBUFFER, | |
518 | .index = -1, | |
519 | .data = &grlib_apbuart_driver, | |
520 | }; | |
521 | ||
522 | ||
523 | static void grlib_apbuart_configure(void); | |
524 | ||
525 | static int __init apbuart_console_init(void) | |
526 | { | |
527 | grlib_apbuart_configure(); | |
528 | register_console(&grlib_apbuart_console); | |
529 | return 0; | |
530 | } | |
531 | ||
532 | console_initcall(apbuart_console_init); | |
533 | ||
534 | #define APBUART_CONSOLE (&grlib_apbuart_console) | |
535 | #else | |
536 | #define APBUART_CONSOLE NULL | |
537 | #endif | |
538 | ||
539 | static struct uart_driver grlib_apbuart_driver = { | |
540 | .owner = THIS_MODULE, | |
541 | .driver_name = "serial", | |
542 | .dev_name = "ttyS", | |
543 | .major = SERIAL_APBUART_MAJOR, | |
544 | .minor = SERIAL_APBUART_MINOR, | |
545 | .nr = UART_NR, | |
546 | .cons = APBUART_CONSOLE, | |
547 | }; | |
548 | ||
549 | ||
550 | /* ======================================================================== */ | |
551 | /* OF Platform Driver */ | |
552 | /* ======================================================================== */ | |
553 | ||
2dc11581 | 554 | static int __devinit apbuart_probe(struct platform_device *op, |
d4ac42a5 KG |
555 | const struct of_device_id *match) |
556 | { | |
557 | int i = -1; | |
558 | struct uart_port *port = NULL; | |
559 | ||
560 | i = 0; | |
561 | for (i = 0; i < grlib_apbuart_port_nr; i++) { | |
61c7a080 | 562 | if (op->dev.of_node == grlib_apbuart_nodes[i]) |
d4ac42a5 KG |
563 | break; |
564 | } | |
565 | ||
566 | port = &grlib_apbuart_ports[i]; | |
567 | port->dev = &op->dev; | |
568 | ||
569 | uart_add_one_port(&grlib_apbuart_driver, (struct uart_port *) port); | |
570 | ||
571 | apbuart_flush_fifo((struct uart_port *) port); | |
572 | ||
384a17b2 DM |
573 | printk(KERN_INFO "grlib-apbuart at 0x%llx, irq %d\n", |
574 | (unsigned long long) port->mapbase, port->irq); | |
d4ac42a5 KG |
575 | return 0; |
576 | ||
577 | } | |
578 | ||
579 | static struct of_device_id __initdata apbuart_match[] = { | |
580 | { | |
581 | .name = "GAISLER_APBUART", | |
582 | }, | |
583 | {}, | |
584 | }; | |
585 | ||
586 | static struct of_platform_driver grlib_apbuart_of_driver = { | |
d4ac42a5 KG |
587 | .probe = apbuart_probe, |
588 | .driver = { | |
4018294b GL |
589 | .owner = THIS_MODULE, |
590 | .name = "grlib-apbuart", | |
591 | .of_match_table = apbuart_match, | |
592 | }, | |
d4ac42a5 KG |
593 | }; |
594 | ||
595 | ||
596 | static void grlib_apbuart_configure(void) | |
597 | { | |
598 | static int enum_done; | |
d1350098 | 599 | struct device_node *np, *rp; |
d4ac42a5 | 600 | struct uart_port *port = NULL; |
d1350098 | 601 | const u32 *prop; |
d4ac42a5 KG |
602 | int freq_khz; |
603 | int v = 0, d = 0; | |
604 | unsigned int addr; | |
605 | int irq, line; | |
606 | struct amba_prom_registers *regs; | |
607 | ||
608 | if (enum_done) | |
609 | return; | |
610 | ||
611 | /* Get bus frequency */ | |
4edd5ad0 | 612 | rp = of_find_node_by_path("/"); |
d1350098 DM |
613 | rp = of_get_next_child(rp, NULL); |
614 | prop = of_get_property(rp, "clock-frequency", NULL); | |
615 | freq_khz = *prop; | |
d4ac42a5 KG |
616 | |
617 | line = 0; | |
618 | for_each_matching_node(np, apbuart_match) { | |
619 | ||
620 | int *vendor = (int *) of_get_property(np, "vendor", NULL); | |
621 | int *device = (int *) of_get_property(np, "device", NULL); | |
622 | int *irqs = (int *) of_get_property(np, "interrupts", NULL); | |
623 | regs = (struct amba_prom_registers *) | |
624 | of_get_property(np, "reg", NULL); | |
625 | ||
626 | if (vendor) | |
627 | v = *vendor; | |
628 | if (device) | |
629 | d = *device; | |
630 | ||
631 | if (!irqs || !regs) | |
632 | return; | |
633 | ||
634 | grlib_apbuart_nodes[line] = np; | |
635 | ||
636 | addr = regs->phys_addr; | |
637 | irq = *irqs; | |
638 | ||
639 | port = &grlib_apbuart_ports[line]; | |
640 | ||
641 | port->mapbase = addr; | |
642 | port->membase = ioremap(addr, sizeof(struct grlib_apbuart_regs_map)); | |
643 | port->irq = irq; | |
644 | port->iotype = UPIO_MEM; | |
645 | port->ops = &grlib_apbuart_ops; | |
646 | port->flags = UPF_BOOT_AUTOCONF; | |
647 | port->line = line; | |
648 | port->uartclk = freq_khz * 1000; | |
649 | port->fifosize = apbuart_scan_fifo_size((struct uart_port *) port, line); | |
650 | line++; | |
651 | ||
652 | /* We support maximum UART_NR uarts ... */ | |
653 | if (line == UART_NR) | |
654 | break; | |
655 | ||
656 | } | |
657 | ||
658 | enum_done = 1; | |
659 | ||
660 | grlib_apbuart_driver.nr = grlib_apbuart_port_nr = line; | |
661 | } | |
662 | ||
663 | static int __init grlib_apbuart_init(void) | |
664 | { | |
665 | int ret; | |
666 | ||
667 | /* Find all APBUARTS in device the tree and initialize their ports */ | |
668 | grlib_apbuart_configure(); | |
669 | ||
670 | printk(KERN_INFO "Serial: GRLIB APBUART driver\n"); | |
671 | ||
672 | ret = uart_register_driver(&grlib_apbuart_driver); | |
673 | ||
674 | if (ret) { | |
675 | printk(KERN_ERR "%s: uart_register_driver failed (%i)\n", | |
676 | __FILE__, ret); | |
677 | return ret; | |
678 | } | |
679 | ||
ddaf1b27 | 680 | ret = of_register_platform_driver(&grlib_apbuart_of_driver); |
d4ac42a5 KG |
681 | if (ret) { |
682 | printk(KERN_ERR | |
683 | "%s: of_register_platform_driver failed (%i)\n", | |
684 | __FILE__, ret); | |
685 | uart_unregister_driver(&grlib_apbuart_driver); | |
686 | return ret; | |
687 | } | |
688 | ||
689 | return ret; | |
690 | } | |
691 | ||
692 | static void __exit grlib_apbuart_exit(void) | |
693 | { | |
694 | int i; | |
695 | ||
696 | for (i = 0; i < grlib_apbuart_port_nr; i++) | |
697 | uart_remove_one_port(&grlib_apbuart_driver, | |
698 | &grlib_apbuart_ports[i]); | |
699 | ||
700 | uart_unregister_driver(&grlib_apbuart_driver); | |
ddaf1b27 | 701 | of_unregister_platform_driver(&grlib_apbuart_of_driver); |
d4ac42a5 KG |
702 | } |
703 | ||
704 | module_init(grlib_apbuart_init); | |
705 | module_exit(grlib_apbuart_exit); | |
706 | ||
707 | MODULE_AUTHOR("Aeroflex Gaisler AB"); | |
708 | MODULE_DESCRIPTION("GRLIB APBUART serial driver"); | |
709 | MODULE_VERSION("2.1"); | |
710 | MODULE_LICENSE("GPL"); |