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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
[linux-2.6/verdex.git] / drivers / serial / bfin_5xx.c
blob0aa345b9a38bd8d605cb2112153fc49f388f8ec8
1 /*
2 * Blackfin On-Chip Serial Driver
3 *
4 * Copyright 2006-2007 Analog Devices Inc.
5 *
6 * Enter bugs at http://blackfin.uclinux.org/
7 *
8 * Licensed under the GPL-2 or later.
9 */
10
11 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
12 #define SUPPORT_SYSRQ
13 #endif
14
15 #include <linux/module.h>
16 #include <linux/ioport.h>
17 #include <linux/init.h>
18 #include <linux/console.h>
19 #include <linux/sysrq.h>
20 #include <linux/platform_device.h>
21 #include <linux/tty.h>
22 #include <linux/tty_flip.h>
23 #include <linux/serial_core.h>
24
25 #ifdef CONFIG_KGDB_UART
26 #include <linux/kgdb.h>
27 #include <asm/irq_regs.h>
28 #endif
29
30 #include <asm/gpio.h>
31 #include <asm/mach/bfin_serial_5xx.h>
32
33 #ifdef CONFIG_SERIAL_BFIN_DMA
34 #include <linux/dma-mapping.h>
35 #include <asm/io.h>
36 #include <asm/irq.h>
37 #include <asm/cacheflush.h>
38 #endif
39
40 /* UART name and device definitions */
41 #define BFIN_SERIAL_NAME "ttyBF"
42 #define BFIN_SERIAL_MAJOR 204
43 #define BFIN_SERIAL_MINOR 64
44
45 /*
46 * Setup for console. Argument comes from the menuconfig
47 */
48 #define DMA_RX_XCOUNT 512
49 #define DMA_RX_YCOUNT (PAGE_SIZE / DMA_RX_XCOUNT)
50
51 #define DMA_RX_FLUSH_JIFFIES (HZ / 50)
52
53 #ifdef CONFIG_SERIAL_BFIN_DMA
54 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
55 #else
56 static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
57 #endif
58
59 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart);
60
61 /*
62 * interrupts are disabled on entry
63 */
64 static void bfin_serial_stop_tx(struct uart_port *port)
65 {
66 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
67 struct circ_buf *xmit = &uart->port.info->xmit;
68 #if !defined(CONFIG_BF54x) && !defined(CONFIG_SERIAL_BFIN_DMA)
69 unsigned short ier;
70 #endif
71
72 while (!(UART_GET_LSR(uart) & TEMT))
73 cpu_relax();
74
75 #ifdef CONFIG_SERIAL_BFIN_DMA
76 disable_dma(uart->tx_dma_channel);
77 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
78 uart->port.icount.tx += uart->tx_count;
79 uart->tx_count = 0;
80 uart->tx_done = 1;
81 #else
82 #ifdef CONFIG_BF54x
83 /* Clear TFI bit */
84 UART_PUT_LSR(uart, TFI);
85 UART_CLEAR_IER(uart, ETBEI);
86 #else
87 ier = UART_GET_IER(uart);
88 ier &= ~ETBEI;
89 UART_PUT_IER(uart, ier);
90 #endif
91 #endif
92 }
93
94 /*
95 * port is locked and interrupts are disabled
96 */
97 static void bfin_serial_start_tx(struct uart_port *port)
98 {
99 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
100
101 #ifdef CONFIG_SERIAL_BFIN_DMA
102 if (uart->tx_done)
103 bfin_serial_dma_tx_chars(uart);
104 #else
105 #ifdef CONFIG_BF54x
106 UART_SET_IER(uart, ETBEI);
107 #else
108 unsigned short ier;
109 ier = UART_GET_IER(uart);
110 ier |= ETBEI;
111 UART_PUT_IER(uart, ier);
112 #endif
113 bfin_serial_tx_chars(uart);
114 #endif
115 }
116
117 /*
118 * Interrupts are enabled
119 */
120 static void bfin_serial_stop_rx(struct uart_port *port)
121 {
122 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
123 #ifdef CONFIG_KGDB_UART
124 if (uart->port.line != CONFIG_KGDB_UART_PORT) {
125 #endif
126 #ifdef CONFIG_BF54x
127 UART_CLEAR_IER(uart, ERBFI);
128 #else
129 unsigned short ier;
130
131 ier = UART_GET_IER(uart);
132 ier &= ~ERBFI;
133 UART_PUT_IER(uart, ier);
134 #endif
135 #ifdef CONFIG_KGDB_UART
136 }
137 #endif
138 }
139
140 /*
141 * Set the modem control timer to fire immediately.
142 */
143 static void bfin_serial_enable_ms(struct uart_port *port)
144 {
145 }
146
147 #ifdef CONFIG_KGDB_UART
148 static int kgdb_entry_state;
149
150 void kgdb_put_debug_char(int chr)
151 {
152 struct bfin_serial_port *uart;
153
154 if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
155 uart = &bfin_serial_ports[0];
156 else
157 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
158
159 while (!(UART_GET_LSR(uart) & THRE)) {
160 SSYNC();
161 }
162
163 #ifndef CONFIG_BF54x
164 UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
165 SSYNC();
166 #endif
167 UART_PUT_CHAR(uart, (unsigned char)chr);
168 SSYNC();
169 }
170
171 int kgdb_get_debug_char(void)
172 {
173 struct bfin_serial_port *uart;
174 unsigned char chr;
175
176 if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
177 uart = &bfin_serial_ports[0];
178 else
179 uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
180
181 while(!(UART_GET_LSR(uart) & DR)) {
182 SSYNC();
183 }
184 #ifndef CONFIG_BF54x
185 UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
186 SSYNC();
187 #endif
188 chr = UART_GET_CHAR(uart);
189 SSYNC();
190
191 return chr;
192 }
193 #endif
194
195 #if ANOMALY_05000230 && defined(CONFIG_SERIAL_BFIN_PIO)
196 # define UART_GET_ANOMALY_THRESHOLD(uart) ((uart)->anomaly_threshold)
197 # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
198 #else
199 # define UART_GET_ANOMALY_THRESHOLD(uart) 0
200 # define UART_SET_ANOMALY_THRESHOLD(uart, v)
201 #endif
202
203 #ifdef CONFIG_SERIAL_BFIN_PIO
204 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
205 {
206 struct tty_struct *tty = uart->port.info->tty;
207 unsigned int status, ch, flg;
208 static struct timeval anomaly_start = { .tv_sec = 0 };
209 #ifdef CONFIG_KGDB_UART
210 struct pt_regs *regs = get_irq_regs();
211 #endif
212
213 status = UART_GET_LSR(uart);
214 UART_CLEAR_LSR(uart);
215
216 ch = UART_GET_CHAR(uart);
217 uart->port.icount.rx++;
218
219 #ifdef CONFIG_KGDB_UART
220 if (uart->port.line == CONFIG_KGDB_UART_PORT) {
221 if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */
222 kgdb_breakkey_pressed(regs);
223 return;
224 } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */
225 kgdb_entry_state = 1;
226 } else if (kgdb_entry_state == 1 && ch == 'q') {
227 kgdb_entry_state = 0;
228 kgdb_breakkey_pressed(regs);
229 return;
230 } else if (ch == 0x3) {/* Ctrl + C */
231 kgdb_entry_state = 0;
232 kgdb_breakkey_pressed(regs);
233 return;
234 } else {
235 kgdb_entry_state = 0;
236 }
237 }
238 #endif
239
240 if (ANOMALY_05000230) {
241 /* The BF533 (and BF561) family of processors have a nice anomaly
242 * where they continuously generate characters for a "single" break.
243 * We have to basically ignore this flood until the "next" valid
244 * character comes across. Due to the nature of the flood, it is
245 * not possible to reliably catch bytes that are sent too quickly
246 * after this break. So application code talking to the Blackfin
247 * which sends a break signal must allow at least 1.5 character
248 * times after the end of the break for things to stabilize. This
249 * timeout was picked as it must absolutely be larger than 1
250 * character time +/- some percent. So 1.5 sounds good. All other
251 * Blackfin families operate properly. Woo.
252 * Note: While Anomaly 05000230 does not directly address this,
253 * the changes that went in for it also fixed this issue.
254 * That anomaly was fixed in 0.5+ silicon. I like bunnies.
255 */
256 if (anomaly_start.tv_sec) {
257 struct timeval curr;
258 suseconds_t usecs;
259
260 if ((~ch & (~ch + 1)) & 0xff)
261 goto known_good_char;
262
263 do_gettimeofday(&curr);
264 if (curr.tv_sec - anomaly_start.tv_sec > 1)
265 goto known_good_char;
266
267 usecs = 0;
268 if (curr.tv_sec != anomaly_start.tv_sec)
269 usecs += USEC_PER_SEC;
270 usecs += curr.tv_usec - anomaly_start.tv_usec;
271
272 if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
273 goto known_good_char;
274
275 if (ch)
276 anomaly_start.tv_sec = 0;
277 else
278 anomaly_start = curr;
279
280 return;
281
282 known_good_char:
283 anomaly_start.tv_sec = 0;
284 }
285 }
286
287 if (status & BI) {
288 if (ANOMALY_05000230)
289 if (bfin_revid() < 5)
290 do_gettimeofday(&anomaly_start);
291 uart->port.icount.brk++;
292 if (uart_handle_break(&uart->port))
293 goto ignore_char;
294 status &= ~(PE | FE);
295 }
296 if (status & PE)
297 uart->port.icount.parity++;
298 if (status & OE)
299 uart->port.icount.overrun++;
300 if (status & FE)
301 uart->port.icount.frame++;
302
303 status &= uart->port.read_status_mask;
304
305 if (status & BI)
306 flg = TTY_BREAK;
307 else if (status & PE)
308 flg = TTY_PARITY;
309 else if (status & FE)
310 flg = TTY_FRAME;
311 else
312 flg = TTY_NORMAL;
313
314 if (uart_handle_sysrq_char(&uart->port, ch))
315 goto ignore_char;
316
317 uart_insert_char(&uart->port, status, OE, ch, flg);
318
319 ignore_char:
320 tty_flip_buffer_push(tty);
321 }
322
323 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
324 {
325 struct circ_buf *xmit = &uart->port.info->xmit;
326
327 if (uart->port.x_char) {
328 UART_PUT_CHAR(uart, uart->port.x_char);
329 uart->port.icount.tx++;
330 uart->port.x_char = 0;
331 }
332 /*
333 * Check the modem control lines before
334 * transmitting anything.
335 */
336 bfin_serial_mctrl_check(uart);
337
338 if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
339 bfin_serial_stop_tx(&uart->port);
340 return;
341 }
342
343 while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
344 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
345 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
346 uart->port.icount.tx++;
347 SSYNC();
348 }
349
350 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
351 uart_write_wakeup(&uart->port);
352
353 if (uart_circ_empty(xmit))
354 bfin_serial_stop_tx(&uart->port);
355 }
356
357 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
358 {
359 struct bfin_serial_port *uart = dev_id;
360
361 spin_lock(&uart->port.lock);
362 while (UART_GET_LSR(uart) & DR)
363 bfin_serial_rx_chars(uart);
364 spin_unlock(&uart->port.lock);
365
366 return IRQ_HANDLED;
367 }
368
369 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
370 {
371 struct bfin_serial_port *uart = dev_id;
372
373 spin_lock(&uart->port.lock);
374 if (UART_GET_LSR(uart) & THRE)
375 bfin_serial_tx_chars(uart);
376 spin_unlock(&uart->port.lock);
377
378 return IRQ_HANDLED;
379 }
380 #endif
381
382 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
383 static void bfin_serial_do_work(struct work_struct *work)
384 {
385 struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
386
387 bfin_serial_mctrl_check(uart);
388 }
389 #endif
390
391 #ifdef CONFIG_SERIAL_BFIN_DMA
392 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
393 {
394 struct circ_buf *xmit = &uart->port.info->xmit;
395 unsigned short ier;
396
397 uart->tx_done = 0;
398
399 if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
400 uart->tx_count = 0;
401 uart->tx_done = 1;
402 return;
403 }
404
405 if (uart->port.x_char) {
406 UART_PUT_CHAR(uart, uart->port.x_char);
407 uart->port.icount.tx++;
408 uart->port.x_char = 0;
409 }
410
411 /*
412 * Check the modem control lines before
413 * transmitting anything.
414 */
415 bfin_serial_mctrl_check(uart);
416
417 uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
418 if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
419 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
420 blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
421 (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
422 set_dma_config(uart->tx_dma_channel,
423 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
424 INTR_ON_BUF,
425 DIMENSION_LINEAR,
426 DATA_SIZE_8,
427 DMA_SYNC_RESTART));
428 set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
429 set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
430 set_dma_x_modify(uart->tx_dma_channel, 1);
431 enable_dma(uart->tx_dma_channel);
432
433 #ifdef CONFIG_BF54x
434 UART_SET_IER(uart, ETBEI);
435 #else
436 ier = UART_GET_IER(uart);
437 ier |= ETBEI;
438 UART_PUT_IER(uart, ier);
439 #endif
440 }
441
442 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
443 {
444 struct tty_struct *tty = uart->port.info->tty;
445 int i, flg, status;
446
447 status = UART_GET_LSR(uart);
448 UART_CLEAR_LSR(uart);
449
450 uart->port.icount.rx +=
451 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
452 UART_XMIT_SIZE);
453
454 if (status & BI) {
455 uart->port.icount.brk++;
456 if (uart_handle_break(&uart->port))
457 goto dma_ignore_char;
458 status &= ~(PE | FE);
459 }
460 if (status & PE)
461 uart->port.icount.parity++;
462 if (status & OE)
463 uart->port.icount.overrun++;
464 if (status & FE)
465 uart->port.icount.frame++;
466
467 status &= uart->port.read_status_mask;
468
469 if (status & BI)
470 flg = TTY_BREAK;
471 else if (status & PE)
472 flg = TTY_PARITY;
473 else if (status & FE)
474 flg = TTY_FRAME;
475 else
476 flg = TTY_NORMAL;
477
478 for (i = uart->rx_dma_buf.tail; i != uart->rx_dma_buf.head; i++) {
479 if (i >= UART_XMIT_SIZE)
480 i = 0;
481 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
482 uart_insert_char(&uart->port, status, OE,
483 uart->rx_dma_buf.buf[i], flg);
484 }
485
486 dma_ignore_char:
487 tty_flip_buffer_push(tty);
488 }
489
490 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
491 {
492 int x_pos, pos;
493
494 uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
495 x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
496 uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
497 if (uart->rx_dma_nrows == DMA_RX_YCOUNT)
498 uart->rx_dma_nrows = 0;
499 x_pos = DMA_RX_XCOUNT - x_pos;
500 if (x_pos == DMA_RX_XCOUNT)
501 x_pos = 0;
502
503 pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
504 if (pos != uart->rx_dma_buf.tail) {
505 uart->rx_dma_buf.head = pos;
506 bfin_serial_dma_rx_chars(uart);
507 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
508 }
509
510 uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
511 add_timer(&(uart->rx_dma_timer));
512 }
513
514 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
515 {
516 struct bfin_serial_port *uart = dev_id;
517 struct circ_buf *xmit = &uart->port.info->xmit;
518 unsigned short ier;
519
520 spin_lock(&uart->port.lock);
521 if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
522 disable_dma(uart->tx_dma_channel);
523 clear_dma_irqstat(uart->tx_dma_channel);
524 #ifdef CONFIG_BF54x
525 UART_CLEAR_IER(uart, ETBEI);
526 #else
527 ier = UART_GET_IER(uart);
528 ier &= ~ETBEI;
529 UART_PUT_IER(uart, ier);
530 #endif
531 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
532 uart->port.icount.tx += uart->tx_count;
533
534 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
535 uart_write_wakeup(&uart->port);
536
537 bfin_serial_dma_tx_chars(uart);
538 }
539
540 spin_unlock(&uart->port.lock);
541 return IRQ_HANDLED;
542 }
543
544 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
545 {
546 struct bfin_serial_port *uart = dev_id;
547 unsigned short irqstat;
548
549 spin_lock(&uart->port.lock);
550 irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
551 clear_dma_irqstat(uart->rx_dma_channel);
552 spin_unlock(&uart->port.lock);
553
554 del_timer(&(uart->rx_dma_timer));
555 uart->rx_dma_timer.expires = jiffies;
556 add_timer(&(uart->rx_dma_timer));
557
558 return IRQ_HANDLED;
559 }
560 #endif
561
562 /*
563 * Return TIOCSER_TEMT when transmitter is not busy.
564 */
565 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
566 {
567 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
568 unsigned short lsr;
569
570 lsr = UART_GET_LSR(uart);
571 if (lsr & TEMT)
572 return TIOCSER_TEMT;
573 else
574 return 0;
575 }
576
577 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
578 {
579 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
580 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
581 if (uart->cts_pin < 0)
582 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
583
584 # ifdef BF54x
585 if (UART_GET_MSR(uart) & CTS)
586 # else
587 if (gpio_get_value(uart->cts_pin))
588 # endif
589 return TIOCM_DSR | TIOCM_CAR;
590 else
591 #endif
592 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
593 }
594
595 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
596 {
597 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
598 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
599 if (uart->rts_pin < 0)
600 return;
601
602 if (mctrl & TIOCM_RTS)
603 # ifdef BF54x
604 UART_PUT_MCR(uart, UART_GET_MCR(uart) & ~MRTS);
605 # else
606 gpio_set_value(uart->rts_pin, 0);
607 # endif
608 else
609 # ifdef BF54x
610 UART_PUT_MCR(uart, UART_GET_MCR(uart) | MRTS);
611 # else
612 gpio_set_value(uart->rts_pin, 1);
613 # endif
614 #endif
615 }
616
617 /*
618 * Handle any change of modem status signal since we were last called.
619 */
620 static void bfin_serial_mctrl_check(struct bfin_serial_port *uart)
621 {
622 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
623 unsigned int status;
624 struct uart_info *info = uart->port.info;
625 struct tty_struct *tty = info->tty;
626
627 status = bfin_serial_get_mctrl(&uart->port);
628 uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
629 if (!(status & TIOCM_CTS)) {
630 tty->hw_stopped = 1;
631 schedule_work(&uart->cts_workqueue);
632 } else {
633 tty->hw_stopped = 0;
634 }
635 #endif
636 }
637
638 /*
639 * Interrupts are always disabled.
640 */
641 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
642 {
643 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
644 u16 lcr = UART_GET_LCR(uart);
645 if (break_state)
646 lcr |= SB;
647 else
648 lcr &= ~SB;
649 UART_PUT_LCR(uart, lcr);
650 SSYNC();
651 }
652
653 static int bfin_serial_startup(struct uart_port *port)
654 {
655 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
656
657 #ifdef CONFIG_SERIAL_BFIN_DMA
658 dma_addr_t dma_handle;
659
660 if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
661 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
662 return -EBUSY;
663 }
664
665 if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
666 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
667 free_dma(uart->rx_dma_channel);
668 return -EBUSY;
669 }
670
671 set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
672 set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
673
674 uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
675 uart->rx_dma_buf.head = 0;
676 uart->rx_dma_buf.tail = 0;
677 uart->rx_dma_nrows = 0;
678
679 set_dma_config(uart->rx_dma_channel,
680 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
681 INTR_ON_ROW, DIMENSION_2D,
682 DATA_SIZE_8,
683 DMA_SYNC_RESTART));
684 set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
685 set_dma_x_modify(uart->rx_dma_channel, 1);
686 set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
687 set_dma_y_modify(uart->rx_dma_channel, 1);
688 set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
689 enable_dma(uart->rx_dma_channel);
690
691 uart->rx_dma_timer.data = (unsigned long)(uart);
692 uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
693 uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
694 add_timer(&(uart->rx_dma_timer));
695 #else
696 if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
697 "BFIN_UART_RX", uart)) {
698 # ifdef CONFIG_KGDB_UART
699 if (uart->port.line != CONFIG_KGDB_UART_PORT) {
700 # endif
701 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
702 return -EBUSY;
703 # ifdef CONFIG_KGDB_UART
704 }
705 # endif
706 }
707
708
709 if (request_irq
710 (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
711 "BFIN_UART_TX", uart)) {
712 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
713 free_irq(uart->port.irq, uart);
714 return -EBUSY;
715 }
716 #endif
717 #ifdef CONFIG_BF54x
718 UART_SET_IER(uart, ERBFI);
719 #else
720 UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
721 #endif
722 return 0;
723 }
724
725 static void bfin_serial_shutdown(struct uart_port *port)
726 {
727 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
728
729 #ifdef CONFIG_SERIAL_BFIN_DMA
730 disable_dma(uart->tx_dma_channel);
731 free_dma(uart->tx_dma_channel);
732 disable_dma(uart->rx_dma_channel);
733 free_dma(uart->rx_dma_channel);
734 del_timer(&(uart->rx_dma_timer));
735 dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
736 #else
737 #ifdef CONFIG_KGDB_UART
738 if (uart->port.line != CONFIG_KGDB_UART_PORT)
739 #endif
740 free_irq(uart->port.irq, uart);
741 free_irq(uart->port.irq+1, uart);
742 #endif
743 }
744
745 static void
746 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
747 struct ktermios *old)
748 {
749 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
750 unsigned long flags;
751 unsigned int baud, quot;
752 unsigned short val, ier, lsr, lcr = 0;
753
754 switch (termios->c_cflag & CSIZE) {
755 case CS8:
756 lcr = WLS(8);
757 break;
758 case CS7:
759 lcr = WLS(7);
760 break;
761 case CS6:
762 lcr = WLS(6);
763 break;
764 case CS5:
765 lcr = WLS(5);
766 break;
767 default:
768 printk(KERN_ERR "%s: word lengh not supported\n",
769 __FUNCTION__);
770 }
771
772 if (termios->c_cflag & CSTOPB)
773 lcr |= STB;
774 if (termios->c_cflag & PARENB)
775 lcr |= PEN;
776 if (!(termios->c_cflag & PARODD))
777 lcr |= EPS;
778 if (termios->c_cflag & CMSPAR)
779 lcr |= STP;
780
781 port->read_status_mask = OE;
782 if (termios->c_iflag & INPCK)
783 port->read_status_mask |= (FE | PE);
784 if (termios->c_iflag & (BRKINT | PARMRK))
785 port->read_status_mask |= BI;
786
787 /*
788 * Characters to ignore
789 */
790 port->ignore_status_mask = 0;
791 if (termios->c_iflag & IGNPAR)
792 port->ignore_status_mask |= FE | PE;
793 if (termios->c_iflag & IGNBRK) {
794 port->ignore_status_mask |= BI;
795 /*
796 * If we're ignoring parity and break indicators,
797 * ignore overruns too (for real raw support).
798 */
799 if (termios->c_iflag & IGNPAR)
800 port->ignore_status_mask |= OE;
801 }
802
803 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
804 quot = uart_get_divisor(port, baud);
805 spin_lock_irqsave(&uart->port.lock, flags);
806
807 UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
808
809 do {
810 lsr = UART_GET_LSR(uart);
811 } while (!(lsr & TEMT));
812
813 /* Disable UART */
814 ier = UART_GET_IER(uart);
815 #ifdef CONFIG_BF54x
816 UART_CLEAR_IER(uart, 0xF);
817 #else
818 UART_PUT_IER(uart, 0);
819 #endif
820
821 #ifndef CONFIG_BF54x
822 /* Set DLAB in LCR to Access DLL and DLH */
823 val = UART_GET_LCR(uart);
824 val |= DLAB;
825 UART_PUT_LCR(uart, val);
826 SSYNC();
827 #endif
828
829 UART_PUT_DLL(uart, quot & 0xFF);
830 SSYNC();
831 UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
832 SSYNC();
833
834 #ifndef CONFIG_BF54x
835 /* Clear DLAB in LCR to Access THR RBR IER */
836 val = UART_GET_LCR(uart);
837 val &= ~DLAB;
838 UART_PUT_LCR(uart, val);
839 SSYNC();
840 #endif
841
842 UART_PUT_LCR(uart, lcr);
843
844 /* Enable UART */
845 #ifdef CONFIG_BF54x
846 UART_SET_IER(uart, ier);
847 #else
848 UART_PUT_IER(uart, ier);
849 #endif
850
851 val = UART_GET_GCTL(uart);
852 val |= UCEN;
853 UART_PUT_GCTL(uart, val);
854
855 spin_unlock_irqrestore(&uart->port.lock, flags);
856 }
857
858 static const char *bfin_serial_type(struct uart_port *port)
859 {
860 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
861
862 return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
863 }
864
865 /*
866 * Release the memory region(s) being used by 'port'.
867 */
868 static void bfin_serial_release_port(struct uart_port *port)
869 {
870 }
871
872 /*
873 * Request the memory region(s) being used by 'port'.
874 */
875 static int bfin_serial_request_port(struct uart_port *port)
876 {
877 return 0;
878 }
879
880 /*
881 * Configure/autoconfigure the port.
882 */
883 static void bfin_serial_config_port(struct uart_port *port, int flags)
884 {
885 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
886
887 if (flags & UART_CONFIG_TYPE &&
888 bfin_serial_request_port(&uart->port) == 0)
889 uart->port.type = PORT_BFIN;
890 }
891
892 /*
893 * Verify the new serial_struct (for TIOCSSERIAL).
894 * The only change we allow are to the flags and type, and
895 * even then only between PORT_BFIN and PORT_UNKNOWN
896 */
897 static int
898 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
899 {
900 return 0;
901 }
902
903 static struct uart_ops bfin_serial_pops = {
904 .tx_empty = bfin_serial_tx_empty,
905 .set_mctrl = bfin_serial_set_mctrl,
906 .get_mctrl = bfin_serial_get_mctrl,
907 .stop_tx = bfin_serial_stop_tx,
908 .start_tx = bfin_serial_start_tx,
909 .stop_rx = bfin_serial_stop_rx,
910 .enable_ms = bfin_serial_enable_ms,
911 .break_ctl = bfin_serial_break_ctl,
912 .startup = bfin_serial_startup,
913 .shutdown = bfin_serial_shutdown,
914 .set_termios = bfin_serial_set_termios,
915 .type = bfin_serial_type,
916 .release_port = bfin_serial_release_port,
917 .request_port = bfin_serial_request_port,
918 .config_port = bfin_serial_config_port,
919 .verify_port = bfin_serial_verify_port,
920 };
921
922 static void __init bfin_serial_init_ports(void)
923 {
924 static int first = 1;
925 int i;
926
927 if (!first)
928 return;
929 first = 0;
930
931 for (i = 0; i < nr_ports; i++) {
932 bfin_serial_ports[i].port.uartclk = get_sclk();
933 bfin_serial_ports[i].port.ops = &bfin_serial_pops;
934 bfin_serial_ports[i].port.line = i;
935 bfin_serial_ports[i].port.iotype = UPIO_MEM;
936 bfin_serial_ports[i].port.membase =
937 (void __iomem *)bfin_serial_resource[i].uart_base_addr;
938 bfin_serial_ports[i].port.mapbase =
939 bfin_serial_resource[i].uart_base_addr;
940 bfin_serial_ports[i].port.irq =
941 bfin_serial_resource[i].uart_irq;
942 bfin_serial_ports[i].port.flags = UPF_BOOT_AUTOCONF;
943 #ifdef CONFIG_SERIAL_BFIN_DMA
944 bfin_serial_ports[i].tx_done = 1;
945 bfin_serial_ports[i].tx_count = 0;
946 bfin_serial_ports[i].tx_dma_channel =
947 bfin_serial_resource[i].uart_tx_dma_channel;
948 bfin_serial_ports[i].rx_dma_channel =
949 bfin_serial_resource[i].uart_rx_dma_channel;
950 init_timer(&(bfin_serial_ports[i].rx_dma_timer));
951 #endif
952 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
953 INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work);
954 bfin_serial_ports[i].cts_pin =
955 bfin_serial_resource[i].uart_cts_pin;
956 bfin_serial_ports[i].rts_pin =
957 bfin_serial_resource[i].uart_rts_pin;
958 #endif
959 bfin_serial_hw_init(&bfin_serial_ports[i]);
960 }
961
962 }
963
964 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
965 /*
966 * If the port was already initialised (eg, by a boot loader),
967 * try to determine the current setup.
968 */
969 static void __init
970 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
971 int *parity, int *bits)
972 {
973 unsigned short status;
974
975 status = UART_GET_IER(uart) & (ERBFI | ETBEI);
976 if (status == (ERBFI | ETBEI)) {
977 /* ok, the port was enabled */
978 unsigned short lcr, val;
979 unsigned short dlh, dll;
980
981 lcr = UART_GET_LCR(uart);
982
983 *parity = 'n';
984 if (lcr & PEN) {
985 if (lcr & EPS)
986 *parity = 'e';
987 else
988 *parity = 'o';
989 }
990 switch (lcr & 0x03) {
991 case 0: *bits = 5; break;
992 case 1: *bits = 6; break;
993 case 2: *bits = 7; break;
994 case 3: *bits = 8; break;
995 }
996 #ifndef CONFIG_BF54x
997 /* Set DLAB in LCR to Access DLL and DLH */
998 val = UART_GET_LCR(uart);
999 val |= DLAB;
1000 UART_PUT_LCR(uart, val);
1001 #endif
1002
1003 dll = UART_GET_DLL(uart);
1004 dlh = UART_GET_DLH(uart);
1005
1006 #ifndef CONFIG_BF54x
1007 /* Clear DLAB in LCR to Access THR RBR IER */
1008 val = UART_GET_LCR(uart);
1009 val &= ~DLAB;
1010 UART_PUT_LCR(uart, val);
1011 #endif
1012
1013 *baud = get_sclk() / (16*(dll | dlh << 8));
1014 }
1015 pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits);
1016 }
1017 #endif
1018
1019 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1020 static struct uart_driver bfin_serial_reg;
1021
1022 static int __init
1023 bfin_serial_console_setup(struct console *co, char *options)
1024 {
1025 struct bfin_serial_port *uart;
1026 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1027 int baud = 57600;
1028 int bits = 8;
1029 int parity = 'n';
1030 # ifdef CONFIG_SERIAL_BFIN_CTSRTS
1031 int flow = 'r';
1032 # else
1033 int flow = 'n';
1034 # endif
1035 # endif
1036
1037 /*
1038 * Check whether an invalid uart number has been specified, and
1039 * if so, search for the first available port that does have
1040 * console support.
1041 */
1042 if (co->index == -1 || co->index >= nr_ports)
1043 co->index = 0;
1044 uart = &bfin_serial_ports[co->index];
1045
1046 # ifdef CONFIG_SERIAL_BFIN_CONSOLE
1047 if (options)
1048 uart_parse_options(options, &baud, &parity, &bits, &flow);
1049 else
1050 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1051
1052 return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1053 # else
1054 return 0;
1055 # endif
1056 }
1057 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1058 defined (CONFIG_EARLY_PRINTK) */
1059
1060 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1061 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1062 {
1063 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1064 while (!(UART_GET_LSR(uart) & THRE))
1065 barrier();
1066 UART_PUT_CHAR(uart, ch);
1067 SSYNC();
1068 }
1069
1070 /*
1071 * Interrupts are disabled on entering
1072 */
1073 static void
1074 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1075 {
1076 struct bfin_serial_port *uart = &bfin_serial_ports[co->index];
1077 int flags = 0;
1078
1079 spin_lock_irqsave(&uart->port.lock, flags);
1080 uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1081 spin_unlock_irqrestore(&uart->port.lock, flags);
1082
1083 }
1084
1085 static struct console bfin_serial_console = {
1086 .name = BFIN_SERIAL_NAME,
1087 .write = bfin_serial_console_write,
1088 .device = uart_console_device,
1089 .setup = bfin_serial_console_setup,
1090 .flags = CON_PRINTBUFFER,
1091 .index = -1,
1092 .data = &bfin_serial_reg,
1093 };
1094
1095 static int __init bfin_serial_rs_console_init(void)
1096 {
1097 bfin_serial_init_ports();
1098 register_console(&bfin_serial_console);
1099 #ifdef CONFIG_KGDB_UART
1100 kgdb_entry_state = 0;
1101 init_kgdb_uart();
1102 #endif
1103 return 0;
1104 }
1105 console_initcall(bfin_serial_rs_console_init);
1106
1107 #define BFIN_SERIAL_CONSOLE &bfin_serial_console
1108 #else
1109 #define BFIN_SERIAL_CONSOLE NULL
1110 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1111
1112
1113 #ifdef CONFIG_EARLY_PRINTK
1114 static __init void early_serial_putc(struct uart_port *port, int ch)
1115 {
1116 unsigned timeout = 0xffff;
1117 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1118
1119 while ((!(UART_GET_LSR(uart) & THRE)) && --timeout)
1120 cpu_relax();
1121 UART_PUT_CHAR(uart, ch);
1122 }
1123
1124 static __init void early_serial_write(struct console *con, const char *s,
1125 unsigned int n)
1126 {
1127 struct bfin_serial_port *uart = &bfin_serial_ports[con->index];
1128 unsigned int i;
1129
1130 for (i = 0; i < n; i++, s++) {
1131 if (*s == '\n')
1132 early_serial_putc(&uart->port, '\r');
1133 early_serial_putc(&uart->port, *s);
1134 }
1135 }
1136
1137 static struct __init console bfin_early_serial_console = {
1138 .name = "early_BFuart",
1139 .write = early_serial_write,
1140 .device = uart_console_device,
1141 .flags = CON_PRINTBUFFER,
1142 .setup = bfin_serial_console_setup,
1143 .index = -1,
1144 .data = &bfin_serial_reg,
1145 };
1146
1147 struct console __init *bfin_earlyserial_init(unsigned int port,
1148 unsigned int cflag)
1149 {
1150 struct bfin_serial_port *uart;
1151 struct ktermios t;
1152
1153 if (port == -1 || port >= nr_ports)
1154 port = 0;
1155 bfin_serial_init_ports();
1156 bfin_early_serial_console.index = port;
1157 uart = &bfin_serial_ports[port];
1158 t.c_cflag = cflag;
1159 t.c_iflag = 0;
1160 t.c_oflag = 0;
1161 t.c_lflag = ICANON;
1162 t.c_line = port;
1163 bfin_serial_set_termios(&uart->port, &t, &t);
1164 return &bfin_early_serial_console;
1165 }
1166
1167 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1168
1169 static struct uart_driver bfin_serial_reg = {
1170 .owner = THIS_MODULE,
1171 .driver_name = "bfin-uart",
1172 .dev_name = BFIN_SERIAL_NAME,
1173 .major = BFIN_SERIAL_MAJOR,
1174 .minor = BFIN_SERIAL_MINOR,
1175 .nr = NR_PORTS,
1176 .cons = BFIN_SERIAL_CONSOLE,
1177 };
1178
1179 static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state)
1180 {
1181 struct bfin_serial_port *uart = platform_get_drvdata(dev);
1182
1183 if (uart)
1184 uart_suspend_port(&bfin_serial_reg, &uart->port);
1185
1186 return 0;
1187 }
1188
1189 static int bfin_serial_resume(struct platform_device *dev)
1190 {
1191 struct bfin_serial_port *uart = platform_get_drvdata(dev);
1192
1193 if (uart)
1194 uart_resume_port(&bfin_serial_reg, &uart->port);
1195
1196 return 0;
1197 }
1198
1199 static int bfin_serial_probe(struct platform_device *dev)
1200 {
1201 struct resource *res = dev->resource;
1202 int i;
1203
1204 for (i = 0; i < dev->num_resources; i++, res++)
1205 if (res->flags & IORESOURCE_MEM)
1206 break;
1207
1208 if (i < dev->num_resources) {
1209 for (i = 0; i < nr_ports; i++, res++) {
1210 if (bfin_serial_ports[i].port.mapbase != res->start)
1211 continue;
1212 bfin_serial_ports[i].port.dev = &dev->dev;
1213 uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port);
1214 platform_set_drvdata(dev, &bfin_serial_ports[i]);
1215 }
1216 }
1217
1218 return 0;
1219 }
1220
1221 static int bfin_serial_remove(struct platform_device *pdev)
1222 {
1223 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1224
1225
1226 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1227 gpio_free(uart->cts_pin);
1228 gpio_free(uart->rts_pin);
1229 #endif
1230
1231 platform_set_drvdata(pdev, NULL);
1232
1233 if (uart)
1234 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1235
1236 return 0;
1237 }
1238
1239 static struct platform_driver bfin_serial_driver = {
1240 .probe = bfin_serial_probe,
1241 .remove = bfin_serial_remove,
1242 .suspend = bfin_serial_suspend,
1243 .resume = bfin_serial_resume,
1244 .driver = {
1245 .name = "bfin-uart",
1246 },
1247 };
1248
1249 static int __init bfin_serial_init(void)
1250 {
1251 int ret;
1252 #ifdef CONFIG_KGDB_UART
1253 struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
1254 struct ktermios t;
1255 #endif
1256
1257 pr_info("Serial: Blackfin serial driver\n");
1258
1259 bfin_serial_init_ports();
1260
1261 ret = uart_register_driver(&bfin_serial_reg);
1262 if (ret == 0) {
1263 ret = platform_driver_register(&bfin_serial_driver);
1264 if (ret) {
1265 pr_debug("uart register failed\n");
1266 uart_unregister_driver(&bfin_serial_reg);
1267 }
1268 }
1269 #ifdef CONFIG_KGDB_UART
1270 if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {
1271 request_irq(uart->port.irq, bfin_serial_rx_int,
1272 IRQF_DISABLED, "BFIN_UART_RX", uart);
1273 pr_info("Request irq for kgdb uart port\n");
1274 #ifdef CONFIG_BF54x
1275 UART_SET_IER(uart, ERBFI);
1276 #else
1277 UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
1278 #endif
1279 SSYNC();
1280 t.c_cflag = CS8|B57600;
1281 t.c_iflag = 0;
1282 t.c_oflag = 0;
1283 t.c_lflag = ICANON;
1284 t.c_line = CONFIG_KGDB_UART_PORT;
1285 bfin_serial_set_termios(&uart->port, &t, &t);
1286 }
1287 #endif
1288 return ret;
1289 }
1290
1291 static void __exit bfin_serial_exit(void)
1292 {
1293 platform_driver_unregister(&bfin_serial_driver);
1294 uart_unregister_driver(&bfin_serial_reg);
1295 }
1296
1297 module_init(bfin_serial_init);
1298 module_exit(bfin_serial_exit);
1299
1300 MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>");
1301 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1302 MODULE_LICENSE("GPL");
1303 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
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