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path: root/drivers/serial/bcm63xx_uart.c
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-rw-r--r--drivers/serial/bcm63xx_uart.c890
1 files changed, 890 insertions, 0 deletions
diff --git a/drivers/serial/bcm63xx_uart.c b/drivers/serial/bcm63xx_uart.c
new file mode 100644
index 000000000000..beddaa6e9069
--- /dev/null
+++ b/drivers/serial/bcm63xx_uart.c
@@ -0,0 +1,890 @@
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Derived from many drivers using generic_serial interface.
7 *
8 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
9 *
10 * Serial driver for BCM63xx integrated UART.
11 *
12 * Hardware flow control was _not_ tested since I only have RX/TX on
13 * my board.
14 */
15
16#if defined(CONFIG_SERIAL_BCM63XX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
17#define SUPPORT_SYSRQ
18#endif
19
20#include <linux/kernel.h>
21#include <linux/platform_device.h>
22#include <linux/init.h>
23#include <linux/delay.h>
24#include <linux/module.h>
25#include <linux/console.h>
26#include <linux/clk.h>
27#include <linux/tty.h>
28#include <linux/tty_flip.h>
29#include <linux/sysrq.h>
30#include <linux/serial.h>
31#include <linux/serial_core.h>
32
33#include <bcm63xx_clk.h>
34#include <bcm63xx_irq.h>
35#include <bcm63xx_regs.h>
36#include <bcm63xx_io.h>
37
38#define BCM63XX_NR_UARTS 1
39
40static struct uart_port ports[BCM63XX_NR_UARTS];
41
42/*
43 * rx interrupt mask / stat
44 *
45 * mask:
46 * - rx fifo full
47 * - rx fifo above threshold
48 * - rx fifo not empty for too long
49 */
50#define UART_RX_INT_MASK (UART_IR_MASK(UART_IR_RXOVER) | \
51 UART_IR_MASK(UART_IR_RXTHRESH) | \
52 UART_IR_MASK(UART_IR_RXTIMEOUT))
53
54#define UART_RX_INT_STAT (UART_IR_STAT(UART_IR_RXOVER) | \
55 UART_IR_STAT(UART_IR_RXTHRESH) | \
56 UART_IR_STAT(UART_IR_RXTIMEOUT))
57
58/*
59 * tx interrupt mask / stat
60 *
61 * mask:
62 * - tx fifo empty
63 * - tx fifo below threshold
64 */
65#define UART_TX_INT_MASK (UART_IR_MASK(UART_IR_TXEMPTY) | \
66 UART_IR_MASK(UART_IR_TXTRESH))
67
68#define UART_TX_INT_STAT (UART_IR_STAT(UART_IR_TXEMPTY) | \
69 UART_IR_STAT(UART_IR_TXTRESH))
70
71/*
72 * external input interrupt
73 *
74 * mask: any edge on CTS, DCD
75 */
76#define UART_EXTINP_INT_MASK (UART_EXTINP_IRMASK(UART_EXTINP_IR_CTS) | \
77 UART_EXTINP_IRMASK(UART_EXTINP_IR_DCD))
78
79/*
80 * handy uart register accessor
81 */
82static inline unsigned int bcm_uart_readl(struct uart_port *port,
83 unsigned int offset)
84{
85 return bcm_readl(port->membase + offset);
86}
87
88static inline void bcm_uart_writel(struct uart_port *port,
89 unsigned int value, unsigned int offset)
90{
91 bcm_writel(value, port->membase + offset);
92}
93
94/*
95 * serial core request to check if uart tx fifo is empty
96 */
97static unsigned int bcm_uart_tx_empty(struct uart_port *port)
98{
99 unsigned int val;
100
101 val = bcm_uart_readl(port, UART_IR_REG);
102 return (val & UART_IR_STAT(UART_IR_TXEMPTY)) ? 1 : 0;
103}
104
105/*
106 * serial core request to set RTS and DTR pin state and loopback mode
107 */
108static void bcm_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
109{
110 unsigned int val;
111
112 val = bcm_uart_readl(port, UART_MCTL_REG);
113 val &= ~(UART_MCTL_DTR_MASK | UART_MCTL_RTS_MASK);
114 /* invert of written value is reflected on the pin */
115 if (!(mctrl & TIOCM_DTR))
116 val |= UART_MCTL_DTR_MASK;
117 if (!(mctrl & TIOCM_RTS))
118 val |= UART_MCTL_RTS_MASK;
119 bcm_uart_writel(port, val, UART_MCTL_REG);
120
121 val = bcm_uart_readl(port, UART_CTL_REG);
122 if (mctrl & TIOCM_LOOP)
123 val |= UART_CTL_LOOPBACK_MASK;
124 else
125 val &= ~UART_CTL_LOOPBACK_MASK;
126 bcm_uart_writel(port, val, UART_CTL_REG);
127}
128
129/*
130 * serial core request to return RI, CTS, DCD and DSR pin state
131 */
132static unsigned int bcm_uart_get_mctrl(struct uart_port *port)
133{
134 unsigned int val, mctrl;
135
136 mctrl = 0;
137 val = bcm_uart_readl(port, UART_EXTINP_REG);
138 if (val & UART_EXTINP_RI_MASK)
139 mctrl |= TIOCM_RI;
140 if (val & UART_EXTINP_CTS_MASK)
141 mctrl |= TIOCM_CTS;
142 if (val & UART_EXTINP_DCD_MASK)
143 mctrl |= TIOCM_CD;
144 if (val & UART_EXTINP_DSR_MASK)
145 mctrl |= TIOCM_DSR;
146 return mctrl;
147}
148
149/*
150 * serial core request to disable tx ASAP (used for flow control)
151 */
152static void bcm_uart_stop_tx(struct uart_port *port)
153{
154 unsigned int val;
155
156 val = bcm_uart_readl(port, UART_CTL_REG);
157 val &= ~(UART_CTL_TXEN_MASK);
158 bcm_uart_writel(port, val, UART_CTL_REG);
159
160 val = bcm_uart_readl(port, UART_IR_REG);
161 val &= ~UART_TX_INT_MASK;
162 bcm_uart_writel(port, val, UART_IR_REG);
163}
164
165/*
166 * serial core request to (re)enable tx
167 */
168static void bcm_uart_start_tx(struct uart_port *port)
169{
170 unsigned int val;
171
172 val = bcm_uart_readl(port, UART_IR_REG);
173 val |= UART_TX_INT_MASK;
174 bcm_uart_writel(port, val, UART_IR_REG);
175
176 val = bcm_uart_readl(port, UART_CTL_REG);
177 val |= UART_CTL_TXEN_MASK;
178 bcm_uart_writel(port, val, UART_CTL_REG);
179}
180
181/*
182 * serial core request to stop rx, called before port shutdown
183 */
184static void bcm_uart_stop_rx(struct uart_port *port)
185{
186 unsigned int val;
187
188 val = bcm_uart_readl(port, UART_IR_REG);
189 val &= ~UART_RX_INT_MASK;
190 bcm_uart_writel(port, val, UART_IR_REG);
191}
192
193/*
194 * serial core request to enable modem status interrupt reporting
195 */
196static void bcm_uart_enable_ms(struct uart_port *port)
197{
198 unsigned int val;
199
200 val = bcm_uart_readl(port, UART_IR_REG);
201 val |= UART_IR_MASK(UART_IR_EXTIP);
202 bcm_uart_writel(port, val, UART_IR_REG);
203}
204
205/*
206 * serial core request to start/stop emitting break char
207 */
208static void bcm_uart_break_ctl(struct uart_port *port, int ctl)
209{
210 unsigned long flags;
211 unsigned int val;
212
213 spin_lock_irqsave(&port->lock, flags);
214
215 val = bcm_uart_readl(port, UART_CTL_REG);
216 if (ctl)
217 val |= UART_CTL_XMITBRK_MASK;
218 else
219 val &= ~UART_CTL_XMITBRK_MASK;
220 bcm_uart_writel(port, val, UART_CTL_REG);
221
222 spin_unlock_irqrestore(&port->lock, flags);
223}
224
225/*
226 * return port type in string format
227 */
228static const char *bcm_uart_type(struct uart_port *port)
229{
230 return (port->type == PORT_BCM63XX) ? "bcm63xx_uart" : NULL;
231}
232
233/*
234 * read all chars in rx fifo and send them to core
235 */
236static void bcm_uart_do_rx(struct uart_port *port)
237{
238 struct tty_struct *tty;
239 unsigned int max_count;
240
241 /* limit number of char read in interrupt, should not be
242 * higher than fifo size anyway since we're much faster than
243 * serial port */
244 max_count = 32;
245 tty = port->info->port.tty;
246 do {
247 unsigned int iestat, c, cstat;
248 char flag;
249
250 /* get overrun/fifo empty information from ier
251 * register */
252 iestat = bcm_uart_readl(port, UART_IR_REG);
253 if (!(iestat & UART_IR_STAT(UART_IR_RXNOTEMPTY)))
254 break;
255
256 cstat = c = bcm_uart_readl(port, UART_FIFO_REG);
257 port->icount.rx++;
258 flag = TTY_NORMAL;
259 c &= 0xff;
260
261 if (unlikely((cstat & UART_FIFO_ANYERR_MASK))) {
262 /* do stats first */
263 if (cstat & UART_FIFO_BRKDET_MASK) {
264 port->icount.brk++;
265 if (uart_handle_break(port))
266 continue;
267 }
268
269 if (cstat & UART_FIFO_PARERR_MASK)
270 port->icount.parity++;
271 if (cstat & UART_FIFO_FRAMEERR_MASK)
272 port->icount.frame++;
273
274 /* update flag wrt read_status_mask */
275 cstat &= port->read_status_mask;
276 if (cstat & UART_FIFO_BRKDET_MASK)
277 flag = TTY_BREAK;
278 if (cstat & UART_FIFO_FRAMEERR_MASK)
279 flag = TTY_FRAME;
280 if (cstat & UART_FIFO_PARERR_MASK)
281 flag = TTY_PARITY;
282 }
283
284 if (uart_handle_sysrq_char(port, c))
285 continue;
286
287 if (unlikely(iestat & UART_IR_STAT(UART_IR_RXOVER))) {
288 port->icount.overrun++;
289 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
290 }
291
292 if ((cstat & port->ignore_status_mask) == 0)
293 tty_insert_flip_char(tty, c, flag);
294
295 } while (--max_count);
296
297 tty_flip_buffer_push(tty);
298}
299
300/*
301 * fill tx fifo with chars to send, stop when fifo is about to be full
302 * or when all chars have been sent.
303 */
304static void bcm_uart_do_tx(struct uart_port *port)
305{
306 struct circ_buf *xmit;
307 unsigned int val, max_count;
308
309 if (port->x_char) {
310 bcm_uart_writel(port, port->x_char, UART_FIFO_REG);
311 port->icount.tx++;
312 port->x_char = 0;
313 return;
314 }
315
316 if (uart_tx_stopped(port)) {
317 bcm_uart_stop_tx(port);
318 return;
319 }
320
321 xmit = &port->info->xmit;
322 if (uart_circ_empty(xmit))
323 goto txq_empty;
324
325 val = bcm_uart_readl(port, UART_MCTL_REG);
326 val = (val & UART_MCTL_TXFIFOFILL_MASK) >> UART_MCTL_TXFIFOFILL_SHIFT;
327 max_count = port->fifosize - val;
328
329 while (max_count--) {
330 unsigned int c;
331
332 c = xmit->buf[xmit->tail];
333 bcm_uart_writel(port, c, UART_FIFO_REG);
334 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
335 port->icount.tx++;
336 if (uart_circ_empty(xmit))
337 break;
338 }
339
340 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
341 uart_write_wakeup(port);
342
343 if (uart_circ_empty(xmit))
344 goto txq_empty;
345 return;
346
347txq_empty:
348 /* nothing to send, disable transmit interrupt */
349 val = bcm_uart_readl(port, UART_IR_REG);
350 val &= ~UART_TX_INT_MASK;
351 bcm_uart_writel(port, val, UART_IR_REG);
352 return;
353}
354
355/*
356 * process uart interrupt
357 */
358static irqreturn_t bcm_uart_interrupt(int irq, void *dev_id)
359{
360 struct uart_port *port;
361 unsigned int irqstat;
362
363 port = dev_id;
364 spin_lock(&port->lock);
365
366 irqstat = bcm_uart_readl(port, UART_IR_REG);
367 if (irqstat & UART_RX_INT_STAT)
368 bcm_uart_do_rx(port);
369
370 if (irqstat & UART_TX_INT_STAT)
371 bcm_uart_do_tx(port);
372
373 if (irqstat & UART_IR_MASK(UART_IR_EXTIP)) {
374 unsigned int estat;
375
376 estat = bcm_uart_readl(port, UART_EXTINP_REG);
377 if (estat & UART_EXTINP_IRSTAT(UART_EXTINP_IR_CTS))
378 uart_handle_cts_change(port,
379 estat & UART_EXTINP_CTS_MASK);
380 if (estat & UART_EXTINP_IRSTAT(UART_EXTINP_IR_DCD))
381 uart_handle_dcd_change(port,
382 estat & UART_EXTINP_DCD_MASK);
383 }
384
385 spin_unlock(&port->lock);
386 return IRQ_HANDLED;
387}
388
389/*
390 * enable rx & tx operation on uart
391 */
392static void bcm_uart_enable(struct uart_port *port)
393{
394 unsigned int val;
395
396 val = bcm_uart_readl(port, UART_CTL_REG);
397 val |= (UART_CTL_BRGEN_MASK | UART_CTL_TXEN_MASK | UART_CTL_RXEN_MASK);
398 bcm_uart_writel(port, val, UART_CTL_REG);
399}
400
401/*
402 * disable rx & tx operation on uart
403 */
404static void bcm_uart_disable(struct uart_port *port)
405{
406 unsigned int val;
407
408 val = bcm_uart_readl(port, UART_CTL_REG);
409 val &= ~(UART_CTL_BRGEN_MASK | UART_CTL_TXEN_MASK |
410 UART_CTL_RXEN_MASK);
411 bcm_uart_writel(port, val, UART_CTL_REG);
412}
413
414/*
415 * clear all unread data in rx fifo and unsent data in tx fifo
416 */
417static void bcm_uart_flush(struct uart_port *port)
418{
419 unsigned int val;
420
421 /* empty rx and tx fifo */
422 val = bcm_uart_readl(port, UART_CTL_REG);
423 val |= UART_CTL_RSTRXFIFO_MASK | UART_CTL_RSTTXFIFO_MASK;
424 bcm_uart_writel(port, val, UART_CTL_REG);
425
426 /* read any pending char to make sure all irq status are
427 * cleared */
428 (void)bcm_uart_readl(port, UART_FIFO_REG);
429}
430
431/*
432 * serial core request to initialize uart and start rx operation
433 */
434static int bcm_uart_startup(struct uart_port *port)
435{
436 unsigned int val;
437 int ret;
438
439 /* mask all irq and flush port */
440 bcm_uart_disable(port);
441 bcm_uart_writel(port, 0, UART_IR_REG);
442 bcm_uart_flush(port);
443
444 /* clear any pending external input interrupt */
445 (void)bcm_uart_readl(port, UART_EXTINP_REG);
446
447 /* set rx/tx fifo thresh to fifo half size */
448 val = bcm_uart_readl(port, UART_MCTL_REG);
449 val &= ~(UART_MCTL_RXFIFOTHRESH_MASK | UART_MCTL_TXFIFOTHRESH_MASK);
450 val |= (port->fifosize / 2) << UART_MCTL_RXFIFOTHRESH_SHIFT;
451 val |= (port->fifosize / 2) << UART_MCTL_TXFIFOTHRESH_SHIFT;
452 bcm_uart_writel(port, val, UART_MCTL_REG);
453
454 /* set rx fifo timeout to 1 char time */
455 val = bcm_uart_readl(port, UART_CTL_REG);
456 val &= ~UART_CTL_RXTMOUTCNT_MASK;
457 val |= 1 << UART_CTL_RXTMOUTCNT_SHIFT;
458 bcm_uart_writel(port, val, UART_CTL_REG);
459
460 /* report any edge on dcd and cts */
461 val = UART_EXTINP_INT_MASK;
462 val |= UART_EXTINP_DCD_NOSENSE_MASK;
463 val |= UART_EXTINP_CTS_NOSENSE_MASK;
464 bcm_uart_writel(port, val, UART_EXTINP_REG);
465
466 /* register irq and enable rx interrupts */
467 ret = request_irq(port->irq, bcm_uart_interrupt, 0,
468 bcm_uart_type(port), port);
469 if (ret)
470 return ret;
471 bcm_uart_writel(port, UART_RX_INT_MASK, UART_IR_REG);
472 bcm_uart_enable(port);
473 return 0;
474}
475
476/*
477 * serial core request to flush & disable uart
478 */
479static void bcm_uart_shutdown(struct uart_port *port)
480{
481 unsigned long flags;
482
483 spin_lock_irqsave(&port->lock, flags);
484 bcm_uart_writel(port, 0, UART_IR_REG);
485 spin_unlock_irqrestore(&port->lock, flags);
486
487 bcm_uart_disable(port);
488 bcm_uart_flush(port);
489 free_irq(port->irq, port);
490}
491
492/*
493 * serial core request to change current uart setting
494 */
495static void bcm_uart_set_termios(struct uart_port *port,
496 struct ktermios *new,
497 struct ktermios *old)
498{
499 unsigned int ctl, baud, quot, ier;
500 unsigned long flags;
501
502 spin_lock_irqsave(&port->lock, flags);
503
504 /* disable uart while changing speed */
505 bcm_uart_disable(port);
506 bcm_uart_flush(port);
507
508 /* update Control register */
509 ctl = bcm_uart_readl(port, UART_CTL_REG);
510 ctl &= ~UART_CTL_BITSPERSYM_MASK;
511
512 switch (new->c_cflag & CSIZE) {
513 case CS5:
514 ctl |= (0 << UART_CTL_BITSPERSYM_SHIFT);
515 break;
516 case CS6:
517 ctl |= (1 << UART_CTL_BITSPERSYM_SHIFT);
518 break;
519 case CS7:
520 ctl |= (2 << UART_CTL_BITSPERSYM_SHIFT);
521 break;
522 default:
523 ctl |= (3 << UART_CTL_BITSPERSYM_SHIFT);
524 break;
525 }
526
527 ctl &= ~UART_CTL_STOPBITS_MASK;
528 if (new->c_cflag & CSTOPB)
529 ctl |= UART_CTL_STOPBITS_2;
530 else
531 ctl |= UART_CTL_STOPBITS_1;
532
533 ctl &= ~(UART_CTL_RXPAREN_MASK | UART_CTL_TXPAREN_MASK);
534 if (new->c_cflag & PARENB)
535 ctl |= (UART_CTL_RXPAREN_MASK | UART_CTL_TXPAREN_MASK);
536 ctl &= ~(UART_CTL_RXPAREVEN_MASK | UART_CTL_TXPAREVEN_MASK);
537 if (new->c_cflag & PARODD)
538 ctl |= (UART_CTL_RXPAREVEN_MASK | UART_CTL_TXPAREVEN_MASK);
539 bcm_uart_writel(port, ctl, UART_CTL_REG);
540
541 /* update Baudword register */
542 baud = uart_get_baud_rate(port, new, old, 0, port->uartclk / 16);
543 quot = uart_get_divisor(port, baud) - 1;
544 bcm_uart_writel(port, quot, UART_BAUD_REG);
545
546 /* update Interrupt register */
547 ier = bcm_uart_readl(port, UART_IR_REG);
548
549 ier &= ~UART_IR_MASK(UART_IR_EXTIP);
550 if (UART_ENABLE_MS(port, new->c_cflag))
551 ier |= UART_IR_MASK(UART_IR_EXTIP);
552
553 bcm_uart_writel(port, ier, UART_IR_REG);
554
555 /* update read/ignore mask */
556 port->read_status_mask = UART_FIFO_VALID_MASK;
557 if (new->c_iflag & INPCK) {
558 port->read_status_mask |= UART_FIFO_FRAMEERR_MASK;
559 port->read_status_mask |= UART_FIFO_PARERR_MASK;
560 }
561 if (new->c_iflag & (BRKINT))
562 port->read_status_mask |= UART_FIFO_BRKDET_MASK;
563
564 port->ignore_status_mask = 0;
565 if (new->c_iflag & IGNPAR)
566 port->ignore_status_mask |= UART_FIFO_PARERR_MASK;
567 if (new->c_iflag & IGNBRK)
568 port->ignore_status_mask |= UART_FIFO_BRKDET_MASK;
569 if (!(new->c_cflag & CREAD))
570 port->ignore_status_mask |= UART_FIFO_VALID_MASK;
571
572 uart_update_timeout(port, new->c_cflag, baud);
573 bcm_uart_enable(port);
574 spin_unlock_irqrestore(&port->lock, flags);
575}
576
577/*
578 * serial core request to claim uart iomem
579 */
580static int bcm_uart_request_port(struct uart_port *port)
581{
582 unsigned int size;
583
584 size = RSET_UART_SIZE;
585 if (!request_mem_region(port->mapbase, size, "bcm63xx")) {
586 dev_err(port->dev, "Memory region busy\n");
587 return -EBUSY;
588 }
589
590 port->membase = ioremap(port->mapbase, size);
591 if (!port->membase) {
592 dev_err(port->dev, "Unable to map registers\n");
593 release_mem_region(port->mapbase, size);
594 return -EBUSY;
595 }
596 return 0;
597}
598
599/*
600 * serial core request to release uart iomem
601 */
602static void bcm_uart_release_port(struct uart_port *port)
603{
604 release_mem_region(port->mapbase, RSET_UART_SIZE);
605 iounmap(port->membase);
606}
607
608/*
609 * serial core request to do any port required autoconfiguration
610 */
611static void bcm_uart_config_port(struct uart_port *port, int flags)
612{
613 if (flags & UART_CONFIG_TYPE) {
614 if (bcm_uart_request_port(port))
615 return;
616 port->type = PORT_BCM63XX;
617 }
618}
619
620/*
621 * serial core request to check that port information in serinfo are
622 * suitable
623 */
624static int bcm_uart_verify_port(struct uart_port *port,
625 struct serial_struct *serinfo)
626{
627 if (port->type != PORT_BCM63XX)
628 return -EINVAL;
629 if (port->irq != serinfo->irq)
630 return -EINVAL;
631 if (port->iotype != serinfo->io_type)
632 return -EINVAL;
633 if (port->mapbase != (unsigned long)serinfo->iomem_base)
634 return -EINVAL;
635 return 0;
636}
637
638/* serial core callbacks */
639static struct uart_ops bcm_uart_ops = {
640 .tx_empty = bcm_uart_tx_empty,
641 .get_mctrl = bcm_uart_get_mctrl,
642 .set_mctrl = bcm_uart_set_mctrl,
643 .start_tx = bcm_uart_start_tx,
644 .stop_tx = bcm_uart_stop_tx,
645 .stop_rx = bcm_uart_stop_rx,
646 .enable_ms = bcm_uart_enable_ms,
647 .break_ctl = bcm_uart_break_ctl,
648 .startup = bcm_uart_startup,
649 .shutdown = bcm_uart_shutdown,
650 .set_termios = bcm_uart_set_termios,
651 .type = bcm_uart_type,
652 .release_port = bcm_uart_release_port,
653 .request_port = bcm_uart_request_port,
654 .config_port = bcm_uart_config_port,
655 .verify_port = bcm_uart_verify_port,
656};
657
658
659
660#ifdef CONFIG_SERIAL_BCM63XX_CONSOLE
661static inline void wait_for_xmitr(struct uart_port *port)
662{
663 unsigned int tmout;
664
665 /* Wait up to 10ms for the character(s) to be sent. */
666 tmout = 10000;
667 while (--tmout) {
668 unsigned int val;
669
670 val = bcm_uart_readl(port, UART_IR_REG);
671 if (val & UART_IR_STAT(UART_IR_TXEMPTY))
672 break;
673 udelay(1);
674 }
675
676 /* Wait up to 1s for flow control if necessary */
677 if (port->flags & UPF_CONS_FLOW) {
678 tmout = 1000000;
679 while (--tmout) {
680 unsigned int val;
681
682 val = bcm_uart_readl(port, UART_EXTINP_REG);
683 if (val & UART_EXTINP_CTS_MASK)
684 break;
685 udelay(1);
686 }
687 }
688}
689
690/*
691 * output given char
692 */
693static void bcm_console_putchar(struct uart_port *port, int ch)
694{
695 wait_for_xmitr(port);
696 bcm_uart_writel(port, ch, UART_FIFO_REG);
697}
698
699/*
700 * console core request to output given string
701 */
702static void bcm_console_write(struct console *co, const char *s,
703 unsigned int count)
704{
705 struct uart_port *port;
706 unsigned long flags;
707 int locked;
708
709 port = &ports[co->index];
710
711 local_irq_save(flags);
712 if (port->sysrq) {
713 /* bcm_uart_interrupt() already took the lock */
714 locked = 0;
715 } else if (oops_in_progress) {
716 locked = spin_trylock(&port->lock);
717 } else {
718 spin_lock(&port->lock);
719 locked = 1;
720 }
721
722 /* call helper to deal with \r\n */
723 uart_console_write(port, s, count, bcm_console_putchar);
724
725 /* and wait for char to be transmitted */
726 wait_for_xmitr(port);
727
728 if (locked)
729 spin_unlock(&port->lock);
730 local_irq_restore(flags);
731}
732
733/*
734 * console core request to setup given console, find matching uart
735 * port and setup it.
736 */
737static int bcm_console_setup(struct console *co, char *options)
738{
739 struct uart_port *port;
740 int baud = 9600;
741 int bits = 8;
742 int parity = 'n';
743 int flow = 'n';
744
745 if (co->index < 0 || co->index >= BCM63XX_NR_UARTS)
746 return -EINVAL;
747 port = &ports[co->index];
748 if (!port->membase)
749 return -ENODEV;
750 if (options)
751 uart_parse_options(options, &baud, &parity, &bits, &flow);
752
753 return uart_set_options(port, co, baud, parity, bits, flow);
754}
755
756static struct uart_driver bcm_uart_driver;
757
758static struct console bcm63xx_console = {
759 .name = "ttyS",
760 .write = bcm_console_write,
761 .device = uart_console_device,
762 .setup = bcm_console_setup,
763 .flags = CON_PRINTBUFFER,
764 .index = -1,
765 .data = &bcm_uart_driver,
766};
767
768static int __init bcm63xx_console_init(void)
769{
770 register_console(&bcm63xx_console);
771 return 0;
772}
773
774console_initcall(bcm63xx_console_init);
775
776#define BCM63XX_CONSOLE (&bcm63xx_console)
777#else
778#define BCM63XX_CONSOLE NULL
779#endif /* CONFIG_SERIAL_BCM63XX_CONSOLE */
780
781static struct uart_driver bcm_uart_driver = {
782 .owner = THIS_MODULE,
783 .driver_name = "bcm63xx_uart",
784 .dev_name = "ttyS",
785 .major = TTY_MAJOR,
786 .minor = 64,
787 .nr = 1,
788 .cons = BCM63XX_CONSOLE,
789};
790
791/*
792 * platform driver probe/remove callback
793 */
794static int __devinit bcm_uart_probe(struct platform_device *pdev)
795{
796 struct resource *res_mem, *res_irq;
797 struct uart_port *port;
798 struct clk *clk;
799 int ret;
800
801 if (pdev->id < 0 || pdev->id >= BCM63XX_NR_UARTS)
802 return -EINVAL;
803
804 if (ports[pdev->id].membase)
805 return -EBUSY;
806
807 res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
808 if (!res_mem)
809 return -ENODEV;
810
811 res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
812 if (!res_irq)
813 return -ENODEV;
814
815 clk = clk_get(&pdev->dev, "periph");
816 if (IS_ERR(clk))
817 return -ENODEV;
818
819 port = &ports[pdev->id];
820 memset(port, 0, sizeof(*port));
821 port->iotype = UPIO_MEM;
822 port->mapbase = res_mem->start;
823 port->irq = res_irq->start;
824 port->ops = &bcm_uart_ops;
825 port->flags = UPF_BOOT_AUTOCONF;
826 port->dev = &pdev->dev;
827 port->fifosize = 16;
828 port->uartclk = clk_get_rate(clk) / 2;
829 clk_put(clk);
830
831 ret = uart_add_one_port(&bcm_uart_driver, port);
832 if (ret) {
833 kfree(port);
834 return ret;
835 }
836 platform_set_drvdata(pdev, port);
837 return 0;
838}
839
840static int __devexit bcm_uart_remove(struct platform_device *pdev)
841{
842 struct uart_port *port;
843
844 port = platform_get_drvdata(pdev);
845 uart_remove_one_port(&bcm_uart_driver, port);
846 platform_set_drvdata(pdev, NULL);
847 /* mark port as free */
848 ports[pdev->id].membase = 0;
849 return 0;
850}
851
852/*
853 * platform driver stuff
854 */
855static struct platform_driver bcm_uart_platform_driver = {
856 .probe = bcm_uart_probe,
857 .remove = __devexit_p(bcm_uart_remove),
858 .driver = {
859 .owner = THIS_MODULE,
860 .name = "bcm63xx_uart",
861 },
862};
863
864static int __init bcm_uart_init(void)
865{
866 int ret;
867
868 ret = uart_register_driver(&bcm_uart_driver);
869 if (ret)
870 return ret;
871
872 ret = platform_driver_register(&bcm_uart_platform_driver);
873 if (ret)
874 uart_unregister_driver(&bcm_uart_driver);
875
876 return ret;
877}
878
879static void __exit bcm_uart_exit(void)
880{
881 platform_driver_unregister(&bcm_uart_platform_driver);
882 uart_unregister_driver(&bcm_uart_driver);
883}
884
885module_init(bcm_uart_init);
886module_exit(bcm_uart_exit);
887
888MODULE_AUTHOR("Maxime Bizon <mbizon@freebox.fr>");
889MODULE_DESCRIPTION("Broadcom 63<xx integrated uart driver");
890MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-22 18:31:23 -0500