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pch_uart: reference clock on CM-iTC
[linux/fpc-iii.git] / drivers / tty / serial / bfin_5xx.c
blob9b1ff2b6bb3703e98fcf7b9cd758d1b923ce5fd0
1 /*
2 * Blackfin On-Chip Serial Driver
3 *
4 * Copyright 2006-2010 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 #define DRIVER_NAME "bfin-uart"
16 #define pr_fmt(fmt) DRIVER_NAME ": " fmt
17
18 #include <linux/module.h>
19 #include <linux/ioport.h>
20 #include <linux/gfp.h>
21 #include <linux/io.h>
22 #include <linux/init.h>
23 #include <linux/console.h>
24 #include <linux/sysrq.h>
25 #include <linux/platform_device.h>
26 #include <linux/tty.h>
27 #include <linux/tty_flip.h>
28 #include <linux/serial_core.h>
29 #include <linux/gpio.h>
30 #include <linux/irq.h>
31 #include <linux/kgdb.h>
32 #include <linux/slab.h>
33 #include <linux/dma-mapping.h>
34
35 #include <asm/portmux.h>
36 #include <asm/cacheflush.h>
37 #include <asm/dma.h>
38
39 #define port_membase(uart) (((struct bfin_serial_port *)(uart))->port.membase)
40 #define get_lsr_cache(uart) (((struct bfin_serial_port *)(uart))->lsr)
41 #define put_lsr_cache(uart, v) (((struct bfin_serial_port *)(uart))->lsr = (v))
42 #include <asm/bfin_serial.h>
43
44 #ifdef CONFIG_SERIAL_BFIN_MODULE
45 # undef CONFIG_EARLY_PRINTK
46 #endif
47
48 #ifdef CONFIG_SERIAL_BFIN_MODULE
49 # undef CONFIG_EARLY_PRINTK
50 #endif
51
52 /* UART name and device definitions */
53 #define BFIN_SERIAL_DEV_NAME "ttyBF"
54 #define BFIN_SERIAL_MAJOR 204
55 #define BFIN_SERIAL_MINOR 64
56
57 static struct bfin_serial_port *bfin_serial_ports[BFIN_UART_NR_PORTS];
58
59 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
60 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
61
62 # ifndef CONFIG_SERIAL_BFIN_PIO
63 # error KGDB only support UART in PIO mode.
64 # endif
65
66 static int kgdboc_port_line;
67 static int kgdboc_break_enabled;
68 #endif
69 /*
70 * Setup for console. Argument comes from the menuconfig
71 */
72 #define DMA_RX_XCOUNT 512
73 #define DMA_RX_YCOUNT (PAGE_SIZE / DMA_RX_XCOUNT)
74
75 #define DMA_RX_FLUSH_JIFFIES (HZ / 50)
76
77 #ifdef CONFIG_SERIAL_BFIN_DMA
78 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
79 #else
80 static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
81 #endif
82
83 static void bfin_serial_reset_irda(struct uart_port *port);
84
85 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
86 defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
87 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
88 {
89 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
90 if (uart->cts_pin < 0)
91 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
92
93 /* CTS PIN is negative assertive. */
94 if (UART_GET_CTS(uart))
95 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
96 else
97 return TIOCM_DSR | TIOCM_CAR;
98 }
99
100 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
101 {
102 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
103 if (uart->rts_pin < 0)
104 return;
105
106 /* RTS PIN is negative assertive. */
107 if (mctrl & TIOCM_RTS)
108 UART_ENABLE_RTS(uart);
109 else
110 UART_DISABLE_RTS(uart);
111 }
112
113 /*
114 * Handle any change of modem status signal.
115 */
116 static irqreturn_t bfin_serial_mctrl_cts_int(int irq, void *dev_id)
117 {
118 struct bfin_serial_port *uart = dev_id;
119 unsigned int status;
120
121 status = bfin_serial_get_mctrl(&uart->port);
122 uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
123 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
124 uart->scts = 1;
125 UART_CLEAR_SCTS(uart);
126 UART_CLEAR_IER(uart, EDSSI);
127 #endif
128
129 return IRQ_HANDLED;
130 }
131 #else
132 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
133 {
134 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
135 }
136
137 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
138 {
139 }
140 #endif
141
142 /*
143 * interrupts are disabled on entry
144 */
145 static void bfin_serial_stop_tx(struct uart_port *port)
146 {
147 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
148 #ifdef CONFIG_SERIAL_BFIN_DMA
149 struct circ_buf *xmit = &uart->port.state->xmit;
150 #endif
151
152 while (!(UART_GET_LSR(uart) & TEMT))
153 cpu_relax();
154
155 #ifdef CONFIG_SERIAL_BFIN_DMA
156 disable_dma(uart->tx_dma_channel);
157 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
158 uart->port.icount.tx += uart->tx_count;
159 uart->tx_count = 0;
160 uart->tx_done = 1;
161 #else
162 #ifdef CONFIG_BF54x
163 /* Clear TFI bit */
164 UART_PUT_LSR(uart, TFI);
165 #endif
166 UART_CLEAR_IER(uart, ETBEI);
167 #endif
168 }
169
170 /*
171 * port is locked and interrupts are disabled
172 */
173 static void bfin_serial_start_tx(struct uart_port *port)
174 {
175 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
176 struct tty_struct *tty = uart->port.state->port.tty;
177
178 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
179 if (uart->scts && !(bfin_serial_get_mctrl(&uart->port) & TIOCM_CTS)) {
180 uart->scts = 0;
181 uart_handle_cts_change(&uart->port, uart->scts);
182 }
183 #endif
184
185 /*
186 * To avoid losting RX interrupt, we reset IR function
187 * before sending data.
188 */
189 if (tty->termios->c_line == N_IRDA)
190 bfin_serial_reset_irda(port);
191
192 #ifdef CONFIG_SERIAL_BFIN_DMA
193 if (uart->tx_done)
194 bfin_serial_dma_tx_chars(uart);
195 #else
196 UART_SET_IER(uart, ETBEI);
197 bfin_serial_tx_chars(uart);
198 #endif
199 }
200
201 /*
202 * Interrupts are enabled
203 */
204 static void bfin_serial_stop_rx(struct uart_port *port)
205 {
206 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
207
208 UART_CLEAR_IER(uart, ERBFI);
209 }
210
211 /*
212 * Set the modem control timer to fire immediately.
213 */
214 static void bfin_serial_enable_ms(struct uart_port *port)
215 {
216 }
217
218
219 #if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
220 # define UART_GET_ANOMALY_THRESHOLD(uart) ((uart)->anomaly_threshold)
221 # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
222 #else
223 # define UART_GET_ANOMALY_THRESHOLD(uart) 0
224 # define UART_SET_ANOMALY_THRESHOLD(uart, v)
225 #endif
226
227 #ifdef CONFIG_SERIAL_BFIN_PIO
228 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
229 {
230 struct tty_struct *tty = NULL;
231 unsigned int status, ch, flg;
232 static struct timeval anomaly_start = { .tv_sec = 0 };
233
234 status = UART_GET_LSR(uart);
235 UART_CLEAR_LSR(uart);
236
237 ch = UART_GET_CHAR(uart);
238 uart->port.icount.rx++;
239
240 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
241 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
242 if (kgdb_connected && kgdboc_port_line == uart->port.line
243 && kgdboc_break_enabled)
244 if (ch == 0x3) {/* Ctrl + C */
245 kgdb_breakpoint();
246 return;
247 }
248
249 if (!uart->port.state || !uart->port.state->port.tty)
250 return;
251 #endif
252 tty = uart->port.state->port.tty;
253
254 if (ANOMALY_05000363) {
255 /* The BF533 (and BF561) family of processors have a nice anomaly
256 * where they continuously generate characters for a "single" break.
257 * We have to basically ignore this flood until the "next" valid
258 * character comes across. Due to the nature of the flood, it is
259 * not possible to reliably catch bytes that are sent too quickly
260 * after this break. So application code talking to the Blackfin
261 * which sends a break signal must allow at least 1.5 character
262 * times after the end of the break for things to stabilize. This
263 * timeout was picked as it must absolutely be larger than 1
264 * character time +/- some percent. So 1.5 sounds good. All other
265 * Blackfin families operate properly. Woo.
266 */
267 if (anomaly_start.tv_sec) {
268 struct timeval curr;
269 suseconds_t usecs;
270
271 if ((~ch & (~ch + 1)) & 0xff)
272 goto known_good_char;
273
274 do_gettimeofday(&curr);
275 if (curr.tv_sec - anomaly_start.tv_sec > 1)
276 goto known_good_char;
277
278 usecs = 0;
279 if (curr.tv_sec != anomaly_start.tv_sec)
280 usecs += USEC_PER_SEC;
281 usecs += curr.tv_usec - anomaly_start.tv_usec;
282
283 if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
284 goto known_good_char;
285
286 if (ch)
287 anomaly_start.tv_sec = 0;
288 else
289 anomaly_start = curr;
290
291 return;
292
293 known_good_char:
294 status &= ~BI;
295 anomaly_start.tv_sec = 0;
296 }
297 }
298
299 if (status & BI) {
300 if (ANOMALY_05000363)
301 if (bfin_revid() < 5)
302 do_gettimeofday(&anomaly_start);
303 uart->port.icount.brk++;
304 if (uart_handle_break(&uart->port))
305 goto ignore_char;
306 status &= ~(PE | FE);
307 }
308 if (status & PE)
309 uart->port.icount.parity++;
310 if (status & OE)
311 uart->port.icount.overrun++;
312 if (status & FE)
313 uart->port.icount.frame++;
314
315 status &= uart->port.read_status_mask;
316
317 if (status & BI)
318 flg = TTY_BREAK;
319 else if (status & PE)
320 flg = TTY_PARITY;
321 else if (status & FE)
322 flg = TTY_FRAME;
323 else
324 flg = TTY_NORMAL;
325
326 if (uart_handle_sysrq_char(&uart->port, ch))
327 goto ignore_char;
328
329 uart_insert_char(&uart->port, status, OE, ch, flg);
330
331 ignore_char:
332 tty_flip_buffer_push(tty);
333 }
334
335 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
336 {
337 struct circ_buf *xmit = &uart->port.state->xmit;
338
339 if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
340 #ifdef CONFIG_BF54x
341 /* Clear TFI bit */
342 UART_PUT_LSR(uart, TFI);
343 #endif
344 /* Anomaly notes:
345 * 05000215 - we always clear ETBEI within last UART TX
346 * interrupt to end a string. It is always set
347 * when start a new tx.
348 */
349 UART_CLEAR_IER(uart, ETBEI);
350 return;
351 }
352
353 if (uart->port.x_char) {
354 UART_PUT_CHAR(uart, uart->port.x_char);
355 uart->port.icount.tx++;
356 uart->port.x_char = 0;
357 }
358
359 while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
360 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
361 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
362 uart->port.icount.tx++;
363 }
364
365 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
366 uart_write_wakeup(&uart->port);
367 }
368
369 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
370 {
371 struct bfin_serial_port *uart = dev_id;
372
373 while (UART_GET_LSR(uart) & DR)
374 bfin_serial_rx_chars(uart);
375
376 return IRQ_HANDLED;
377 }
378
379 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
380 {
381 struct bfin_serial_port *uart = dev_id;
382
383 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
384 if (uart->scts && !(bfin_serial_get_mctrl(&uart->port) & TIOCM_CTS)) {
385 uart->scts = 0;
386 uart_handle_cts_change(&uart->port, uart->scts);
387 }
388 #endif
389 spin_lock(&uart->port.lock);
390 if (UART_GET_LSR(uart) & THRE)
391 bfin_serial_tx_chars(uart);
392 spin_unlock(&uart->port.lock);
393
394 return IRQ_HANDLED;
395 }
396 #endif
397
398 #ifdef CONFIG_SERIAL_BFIN_DMA
399 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
400 {
401 struct circ_buf *xmit = &uart->port.state->xmit;
402
403 uart->tx_done = 0;
404
405 if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
406 uart->tx_count = 0;
407 uart->tx_done = 1;
408 return;
409 }
410
411 if (uart->port.x_char) {
412 UART_PUT_CHAR(uart, uart->port.x_char);
413 uart->port.icount.tx++;
414 uart->port.x_char = 0;
415 }
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 SSYNC();
432 enable_dma(uart->tx_dma_channel);
433
434 UART_SET_IER(uart, ETBEI);
435 }
436
437 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
438 {
439 struct tty_struct *tty = uart->port.state->port.tty;
440 int i, flg, status;
441
442 status = UART_GET_LSR(uart);
443 UART_CLEAR_LSR(uart);
444
445 uart->port.icount.rx +=
446 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
447 UART_XMIT_SIZE);
448
449 if (status & BI) {
450 uart->port.icount.brk++;
451 if (uart_handle_break(&uart->port))
452 goto dma_ignore_char;
453 status &= ~(PE | FE);
454 }
455 if (status & PE)
456 uart->port.icount.parity++;
457 if (status & OE)
458 uart->port.icount.overrun++;
459 if (status & FE)
460 uart->port.icount.frame++;
461
462 status &= uart->port.read_status_mask;
463
464 if (status & BI)
465 flg = TTY_BREAK;
466 else if (status & PE)
467 flg = TTY_PARITY;
468 else if (status & FE)
469 flg = TTY_FRAME;
470 else
471 flg = TTY_NORMAL;
472
473 for (i = uart->rx_dma_buf.tail; ; i++) {
474 if (i >= UART_XMIT_SIZE)
475 i = 0;
476 if (i == uart->rx_dma_buf.head)
477 break;
478 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
479 uart_insert_char(&uart->port, status, OE,
480 uart->rx_dma_buf.buf[i], flg);
481 }
482
483 dma_ignore_char:
484 tty_flip_buffer_push(tty);
485 }
486
487 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
488 {
489 int x_pos, pos;
490
491 dma_disable_irq_nosync(uart->rx_dma_channel);
492 spin_lock_bh(&uart->rx_lock);
493
494 /* 2D DMA RX buffer ring is used. Because curr_y_count and
495 * curr_x_count can't be read as an atomic operation,
496 * curr_y_count should be read before curr_x_count. When
497 * curr_x_count is read, curr_y_count may already indicate
498 * next buffer line. But, the position calculated here is
499 * still indicate the old line. The wrong position data may
500 * be smaller than current buffer tail, which cause garbages
501 * are received if it is not prohibit.
502 */
503 uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
504 x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
505 uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
506 if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
507 uart->rx_dma_nrows = 0;
508 x_pos = DMA_RX_XCOUNT - x_pos;
509 if (x_pos == DMA_RX_XCOUNT)
510 x_pos = 0;
511
512 pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
513 /* Ignore receiving data if new position is in the same line of
514 * current buffer tail and small.
515 */
516 if (pos > uart->rx_dma_buf.tail ||
517 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
518 uart->rx_dma_buf.head = pos;
519 bfin_serial_dma_rx_chars(uart);
520 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
521 }
522
523 spin_unlock_bh(&uart->rx_lock);
524 dma_enable_irq(uart->rx_dma_channel);
525
526 mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
527 }
528
529 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
530 {
531 struct bfin_serial_port *uart = dev_id;
532 struct circ_buf *xmit = &uart->port.state->xmit;
533
534 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
535 if (uart->scts && !(bfin_serial_get_mctrl(&uart->port)&TIOCM_CTS)) {
536 uart->scts = 0;
537 uart_handle_cts_change(&uart->port, uart->scts);
538 }
539 #endif
540
541 spin_lock(&uart->port.lock);
542 if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
543 disable_dma(uart->tx_dma_channel);
544 clear_dma_irqstat(uart->tx_dma_channel);
545 /* Anomaly notes:
546 * 05000215 - we always clear ETBEI within last UART TX
547 * interrupt to end a string. It is always set
548 * when start a new tx.
549 */
550 UART_CLEAR_IER(uart, ETBEI);
551 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
552 uart->port.icount.tx += uart->tx_count;
553
554 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
555 uart_write_wakeup(&uart->port);
556
557 bfin_serial_dma_tx_chars(uart);
558 }
559
560 spin_unlock(&uart->port.lock);
561 return IRQ_HANDLED;
562 }
563
564 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
565 {
566 struct bfin_serial_port *uart = dev_id;
567 unsigned short irqstat;
568 int x_pos, pos;
569
570 spin_lock(&uart->rx_lock);
571 irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
572 clear_dma_irqstat(uart->rx_dma_channel);
573
574 uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
575 x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
576 uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
577 if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
578 uart->rx_dma_nrows = 0;
579
580 pos = uart->rx_dma_nrows * DMA_RX_XCOUNT;
581 if (pos > uart->rx_dma_buf.tail ||
582 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
583 uart->rx_dma_buf.head = pos;
584 bfin_serial_dma_rx_chars(uart);
585 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
586 }
587
588 spin_unlock(&uart->rx_lock);
589
590 return IRQ_HANDLED;
591 }
592 #endif
593
594 /*
595 * Return TIOCSER_TEMT when transmitter is not busy.
596 */
597 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
598 {
599 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
600 unsigned short lsr;
601
602 lsr = UART_GET_LSR(uart);
603 if (lsr & TEMT)
604 return TIOCSER_TEMT;
605 else
606 return 0;
607 }
608
609 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
610 {
611 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
612 u16 lcr = UART_GET_LCR(uart);
613 if (break_state)
614 lcr |= SB;
615 else
616 lcr &= ~SB;
617 UART_PUT_LCR(uart, lcr);
618 SSYNC();
619 }
620
621 static int bfin_serial_startup(struct uart_port *port)
622 {
623 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
624
625 #ifdef CONFIG_SERIAL_BFIN_DMA
626 dma_addr_t dma_handle;
627
628 if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
629 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
630 return -EBUSY;
631 }
632
633 if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
634 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
635 free_dma(uart->rx_dma_channel);
636 return -EBUSY;
637 }
638
639 set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
640 set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
641
642 uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
643 uart->rx_dma_buf.head = 0;
644 uart->rx_dma_buf.tail = 0;
645 uart->rx_dma_nrows = 0;
646
647 set_dma_config(uart->rx_dma_channel,
648 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
649 INTR_ON_ROW, DIMENSION_2D,
650 DATA_SIZE_8,
651 DMA_SYNC_RESTART));
652 set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
653 set_dma_x_modify(uart->rx_dma_channel, 1);
654 set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
655 set_dma_y_modify(uart->rx_dma_channel, 1);
656 set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
657 enable_dma(uart->rx_dma_channel);
658
659 uart->rx_dma_timer.data = (unsigned long)(uart);
660 uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
661 uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
662 add_timer(&(uart->rx_dma_timer));
663 #else
664 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
665 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
666 if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
667 kgdboc_break_enabled = 0;
668 else {
669 # endif
670 if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
671 "BFIN_UART_RX", uart)) {
672 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
673 return -EBUSY;
674 }
675
676 if (request_irq
677 (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
678 "BFIN_UART_TX", uart)) {
679 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
680 free_irq(uart->port.irq, uart);
681 return -EBUSY;
682 }
683
684 # ifdef CONFIG_BF54x
685 {
686 /*
687 * UART2 and UART3 on BF548 share interrupt PINs and DMA
688 * controllers with SPORT2 and SPORT3. UART rx and tx
689 * interrupts are generated in PIO mode only when configure
690 * their peripheral mapping registers properly, which means
691 * request corresponding DMA channels in PIO mode as well.
692 */
693 unsigned uart_dma_ch_rx, uart_dma_ch_tx;
694
695 switch (uart->port.irq) {
696 case IRQ_UART3_RX:
697 uart_dma_ch_rx = CH_UART3_RX;
698 uart_dma_ch_tx = CH_UART3_TX;
699 break;
700 case IRQ_UART2_RX:
701 uart_dma_ch_rx = CH_UART2_RX;
702 uart_dma_ch_tx = CH_UART2_TX;
703 break;
704 default:
705 uart_dma_ch_rx = uart_dma_ch_tx = 0;
706 break;
707 };
708
709 if (uart_dma_ch_rx &&
710 request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
711 printk(KERN_NOTICE"Fail to attach UART interrupt\n");
712 free_irq(uart->port.irq, uart);
713 free_irq(uart->port.irq + 1, uart);
714 return -EBUSY;
715 }
716 if (uart_dma_ch_tx &&
717 request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
718 printk(KERN_NOTICE "Fail to attach UART interrupt\n");
719 free_dma(uart_dma_ch_rx);
720 free_irq(uart->port.irq, uart);
721 free_irq(uart->port.irq + 1, uart);
722 return -EBUSY;
723 }
724 }
725 # endif
726 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
727 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
728 }
729 # endif
730 #endif
731
732 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
733 if (uart->cts_pin >= 0) {
734 if (request_irq(gpio_to_irq(uart->cts_pin),
735 bfin_serial_mctrl_cts_int,
736 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
737 IRQF_DISABLED, "BFIN_UART_CTS", uart)) {
738 uart->cts_pin = -1;
739 pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n");
740 }
741 }
742 if (uart->rts_pin >= 0) {
743 gpio_direction_output(uart->rts_pin, 0);
744 }
745 #endif
746 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
747 if (uart->cts_pin >= 0 && request_irq(uart->status_irq,
748 bfin_serial_mctrl_cts_int,
749 IRQF_DISABLED, "BFIN_UART_MODEM_STATUS", uart)) {
750 uart->cts_pin = -1;
751 pr_info("Unable to attach BlackFin UART Modem Status interrupt.\n");
752 }
753
754 /* CTS RTS PINs are negative assertive. */
755 UART_PUT_MCR(uart, ACTS);
756 UART_SET_IER(uart, EDSSI);
757 #endif
758
759 UART_SET_IER(uart, ERBFI);
760 return 0;
761 }
762
763 static void bfin_serial_shutdown(struct uart_port *port)
764 {
765 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
766
767 #ifdef CONFIG_SERIAL_BFIN_DMA
768 disable_dma(uart->tx_dma_channel);
769 free_dma(uart->tx_dma_channel);
770 disable_dma(uart->rx_dma_channel);
771 free_dma(uart->rx_dma_channel);
772 del_timer(&(uart->rx_dma_timer));
773 dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
774 #else
775 #ifdef CONFIG_BF54x
776 switch (uart->port.irq) {
777 case IRQ_UART3_RX:
778 free_dma(CH_UART3_RX);
779 free_dma(CH_UART3_TX);
780 break;
781 case IRQ_UART2_RX:
782 free_dma(CH_UART2_RX);
783 free_dma(CH_UART2_TX);
784 break;
785 default:
786 break;
787 };
788 #endif
789 free_irq(uart->port.irq, uart);
790 free_irq(uart->port.irq+1, uart);
791 #endif
792
793 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
794 if (uart->cts_pin >= 0)
795 free_irq(gpio_to_irq(uart->cts_pin), uart);
796 #endif
797 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
798 if (uart->cts_pin >= 0)
799 free_irq(uart->status_irq, uart);
800 #endif
801 }
802
803 static void
804 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
805 struct ktermios *old)
806 {
807 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
808 unsigned long flags;
809 unsigned int baud, quot;
810 unsigned short val, ier, lcr = 0;
811
812 switch (termios->c_cflag & CSIZE) {
813 case CS8:
814 lcr = WLS(8);
815 break;
816 case CS7:
817 lcr = WLS(7);
818 break;
819 case CS6:
820 lcr = WLS(6);
821 break;
822 case CS5:
823 lcr = WLS(5);
824 break;
825 default:
826 printk(KERN_ERR "%s: word lengh not supported\n",
827 __func__);
828 }
829
830 /* Anomaly notes:
831 * 05000231 - STOP bit is always set to 1 whatever the user is set.
832 */
833 if (termios->c_cflag & CSTOPB) {
834 if (ANOMALY_05000231)
835 printk(KERN_WARNING "STOP bits other than 1 is not "
836 "supported in case of anomaly 05000231.\n");
837 else
838 lcr |= STB;
839 }
840 if (termios->c_cflag & PARENB)
841 lcr |= PEN;
842 if (!(termios->c_cflag & PARODD))
843 lcr |= EPS;
844 if (termios->c_cflag & CMSPAR)
845 lcr |= STP;
846
847 spin_lock_irqsave(&uart->port.lock, flags);
848
849 port->read_status_mask = OE;
850 if (termios->c_iflag & INPCK)
851 port->read_status_mask |= (FE | PE);
852 if (termios->c_iflag & (BRKINT | PARMRK))
853 port->read_status_mask |= BI;
854
855 /*
856 * Characters to ignore
857 */
858 port->ignore_status_mask = 0;
859 if (termios->c_iflag & IGNPAR)
860 port->ignore_status_mask |= FE | PE;
861 if (termios->c_iflag & IGNBRK) {
862 port->ignore_status_mask |= BI;
863 /*
864 * If we're ignoring parity and break indicators,
865 * ignore overruns too (for real raw support).
866 */
867 if (termios->c_iflag & IGNPAR)
868 port->ignore_status_mask |= OE;
869 }
870
871 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
872 quot = uart_get_divisor(port, baud);
873
874 /* If discipline is not IRDA, apply ANOMALY_05000230 */
875 if (termios->c_line != N_IRDA)
876 quot -= ANOMALY_05000230;
877
878 UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
879
880 /* Disable UART */
881 ier = UART_GET_IER(uart);
882 UART_DISABLE_INTS(uart);
883
884 /* Set DLAB in LCR to Access DLL and DLH */
885 UART_SET_DLAB(uart);
886
887 UART_PUT_DLL(uart, quot & 0xFF);
888 UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
889 SSYNC();
890
891 /* Clear DLAB in LCR to Access THR RBR IER */
892 UART_CLEAR_DLAB(uart);
893
894 UART_PUT_LCR(uart, lcr);
895
896 /* Enable UART */
897 UART_ENABLE_INTS(uart, ier);
898
899 val = UART_GET_GCTL(uart);
900 val |= UCEN;
901 UART_PUT_GCTL(uart, val);
902
903 /* Port speed changed, update the per-port timeout. */
904 uart_update_timeout(port, termios->c_cflag, baud);
905
906 spin_unlock_irqrestore(&uart->port.lock, flags);
907 }
908
909 static const char *bfin_serial_type(struct uart_port *port)
910 {
911 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
912
913 return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
914 }
915
916 /*
917 * Release the memory region(s) being used by 'port'.
918 */
919 static void bfin_serial_release_port(struct uart_port *port)
920 {
921 }
922
923 /*
924 * Request the memory region(s) being used by 'port'.
925 */
926 static int bfin_serial_request_port(struct uart_port *port)
927 {
928 return 0;
929 }
930
931 /*
932 * Configure/autoconfigure the port.
933 */
934 static void bfin_serial_config_port(struct uart_port *port, int flags)
935 {
936 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
937
938 if (flags & UART_CONFIG_TYPE &&
939 bfin_serial_request_port(&uart->port) == 0)
940 uart->port.type = PORT_BFIN;
941 }
942
943 /*
944 * Verify the new serial_struct (for TIOCSSERIAL).
945 * The only change we allow are to the flags and type, and
946 * even then only between PORT_BFIN and PORT_UNKNOWN
947 */
948 static int
949 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
950 {
951 return 0;
952 }
953
954 /*
955 * Enable the IrDA function if tty->ldisc.num is N_IRDA.
956 * In other cases, disable IrDA function.
957 */
958 static void bfin_serial_set_ldisc(struct uart_port *port, int ld)
959 {
960 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
961 unsigned short val;
962
963 switch (ld) {
964 case N_IRDA:
965 val = UART_GET_GCTL(uart);
966 val |= (IREN | RPOLC);
967 UART_PUT_GCTL(uart, val);
968 break;
969 default:
970 val = UART_GET_GCTL(uart);
971 val &= ~(IREN | RPOLC);
972 UART_PUT_GCTL(uart, val);
973 }
974 }
975
976 static void bfin_serial_reset_irda(struct uart_port *port)
977 {
978 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
979 unsigned short val;
980
981 val = UART_GET_GCTL(uart);
982 val &= ~(IREN | RPOLC);
983 UART_PUT_GCTL(uart, val);
984 SSYNC();
985 val |= (IREN | RPOLC);
986 UART_PUT_GCTL(uart, val);
987 SSYNC();
988 }
989
990 #ifdef CONFIG_CONSOLE_POLL
991 /* Anomaly notes:
992 * 05000099 - Because we only use THRE in poll_put and DR in poll_get,
993 * losing other bits of UART_LSR is not a problem here.
994 */
995 static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
996 {
997 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
998
999 while (!(UART_GET_LSR(uart) & THRE))
1000 cpu_relax();
1001
1002 UART_CLEAR_DLAB(uart);
1003 UART_PUT_CHAR(uart, (unsigned char)chr);
1004 }
1005
1006 static int bfin_serial_poll_get_char(struct uart_port *port)
1007 {
1008 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1009 unsigned char chr;
1010
1011 while (!(UART_GET_LSR(uart) & DR))
1012 cpu_relax();
1013
1014 UART_CLEAR_DLAB(uart);
1015 chr = UART_GET_CHAR(uart);
1016
1017 return chr;
1018 }
1019 #endif
1020
1021 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
1022 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
1023 static void bfin_kgdboc_port_shutdown(struct uart_port *port)
1024 {
1025 if (kgdboc_break_enabled) {
1026 kgdboc_break_enabled = 0;
1027 bfin_serial_shutdown(port);
1028 }
1029 }
1030
1031 static int bfin_kgdboc_port_startup(struct uart_port *port)
1032 {
1033 kgdboc_port_line = port->line;
1034 kgdboc_break_enabled = !bfin_serial_startup(port);
1035 return 0;
1036 }
1037 #endif
1038
1039 static struct uart_ops bfin_serial_pops = {
1040 .tx_empty = bfin_serial_tx_empty,
1041 .set_mctrl = bfin_serial_set_mctrl,
1042 .get_mctrl = bfin_serial_get_mctrl,
1043 .stop_tx = bfin_serial_stop_tx,
1044 .start_tx = bfin_serial_start_tx,
1045 .stop_rx = bfin_serial_stop_rx,
1046 .enable_ms = bfin_serial_enable_ms,
1047 .break_ctl = bfin_serial_break_ctl,
1048 .startup = bfin_serial_startup,
1049 .shutdown = bfin_serial_shutdown,
1050 .set_termios = bfin_serial_set_termios,
1051 .set_ldisc = bfin_serial_set_ldisc,
1052 .type = bfin_serial_type,
1053 .release_port = bfin_serial_release_port,
1054 .request_port = bfin_serial_request_port,
1055 .config_port = bfin_serial_config_port,
1056 .verify_port = bfin_serial_verify_port,
1057 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
1058 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
1059 .kgdboc_port_startup = bfin_kgdboc_port_startup,
1060 .kgdboc_port_shutdown = bfin_kgdboc_port_shutdown,
1061 #endif
1062 #ifdef CONFIG_CONSOLE_POLL
1063 .poll_put_char = bfin_serial_poll_put_char,
1064 .poll_get_char = bfin_serial_poll_get_char,
1065 #endif
1066 };
1067
1068 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1069 /*
1070 * If the port was already initialised (eg, by a boot loader),
1071 * try to determine the current setup.
1072 */
1073 static void __init
1074 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
1075 int *parity, int *bits)
1076 {
1077 unsigned short status;
1078
1079 status = UART_GET_IER(uart) & (ERBFI | ETBEI);
1080 if (status == (ERBFI | ETBEI)) {
1081 /* ok, the port was enabled */
1082 u16 lcr, dlh, dll;
1083
1084 lcr = UART_GET_LCR(uart);
1085
1086 *parity = 'n';
1087 if (lcr & PEN) {
1088 if (lcr & EPS)
1089 *parity = 'e';
1090 else
1091 *parity = 'o';
1092 }
1093 switch (lcr & 0x03) {
1094 case 0: *bits = 5; break;
1095 case 1: *bits = 6; break;
1096 case 2: *bits = 7; break;
1097 case 3: *bits = 8; break;
1098 }
1099 /* Set DLAB in LCR to Access DLL and DLH */
1100 UART_SET_DLAB(uart);
1101
1102 dll = UART_GET_DLL(uart);
1103 dlh = UART_GET_DLH(uart);
1104
1105 /* Clear DLAB in LCR to Access THR RBR IER */
1106 UART_CLEAR_DLAB(uart);
1107
1108 *baud = get_sclk() / (16*(dll | dlh << 8));
1109 }
1110 pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
1111 }
1112
1113 static struct uart_driver bfin_serial_reg;
1114
1115 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1116 {
1117 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1118 while (!(UART_GET_LSR(uart) & THRE))
1119 barrier();
1120 UART_PUT_CHAR(uart, ch);
1121 }
1122
1123 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1124 defined (CONFIG_EARLY_PRINTK) */
1125
1126 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1127 #define CLASS_BFIN_CONSOLE "bfin-console"
1128 /*
1129 * Interrupts are disabled on entering
1130 */
1131 static void
1132 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1133 {
1134 struct bfin_serial_port *uart = bfin_serial_ports[co->index];
1135 unsigned long flags;
1136
1137 spin_lock_irqsave(&uart->port.lock, flags);
1138 uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1139 spin_unlock_irqrestore(&uart->port.lock, flags);
1140
1141 }
1142
1143 static int __init
1144 bfin_serial_console_setup(struct console *co, char *options)
1145 {
1146 struct bfin_serial_port *uart;
1147 int baud = 57600;
1148 int bits = 8;
1149 int parity = 'n';
1150 # if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1151 defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1152 int flow = 'r';
1153 # else
1154 int flow = 'n';
1155 # endif
1156
1157 /*
1158 * Check whether an invalid uart number has been specified, and
1159 * if so, search for the first available port that does have
1160 * console support.
1161 */
1162 if (co->index < 0 || co->index >= BFIN_UART_NR_PORTS)
1163 return -ENODEV;
1164
1165 uart = bfin_serial_ports[co->index];
1166 if (!uart)
1167 return -ENODEV;
1168
1169 if (options)
1170 uart_parse_options(options, &baud, &parity, &bits, &flow);
1171 else
1172 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1173
1174 return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1175 }
1176
1177 static struct console bfin_serial_console = {
1178 .name = BFIN_SERIAL_DEV_NAME,
1179 .write = bfin_serial_console_write,
1180 .device = uart_console_device,
1181 .setup = bfin_serial_console_setup,
1182 .flags = CON_PRINTBUFFER,
1183 .index = -1,
1184 .data = &bfin_serial_reg,
1185 };
1186 #define BFIN_SERIAL_CONSOLE &bfin_serial_console
1187 #else
1188 #define BFIN_SERIAL_CONSOLE NULL
1189 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1190
1191 #ifdef CONFIG_EARLY_PRINTK
1192 static struct bfin_serial_port bfin_earlyprintk_port;
1193 #define CLASS_BFIN_EARLYPRINTK "bfin-earlyprintk"
1194
1195 /*
1196 * Interrupts are disabled on entering
1197 */
1198 static void
1199 bfin_earlyprintk_console_write(struct console *co, const char *s, unsigned int count)
1200 {
1201 unsigned long flags;
1202
1203 if (bfin_earlyprintk_port.port.line != co->index)
1204 return;
1205
1206 spin_lock_irqsave(&bfin_earlyprintk_port.port.lock, flags);
1207 uart_console_write(&bfin_earlyprintk_port.port, s, count,
1208 bfin_serial_console_putchar);
1209 spin_unlock_irqrestore(&bfin_earlyprintk_port.port.lock, flags);
1210 }
1211
1212 /*
1213 * This should have a .setup or .early_setup in it, but then things get called
1214 * without the command line options, and the baud rate gets messed up - so
1215 * don't let the common infrastructure play with things. (see calls to setup
1216 * & earlysetup in ./kernel/printk.c:register_console()
1217 */
1218 static struct __initdata console bfin_early_serial_console = {
1219 .name = "early_BFuart",
1220 .write = bfin_earlyprintk_console_write,
1221 .device = uart_console_device,
1222 .flags = CON_PRINTBUFFER,
1223 .index = -1,
1224 .data = &bfin_serial_reg,
1225 };
1226 #endif
1227
1228 static struct uart_driver bfin_serial_reg = {
1229 .owner = THIS_MODULE,
1230 .driver_name = DRIVER_NAME,
1231 .dev_name = BFIN_SERIAL_DEV_NAME,
1232 .major = BFIN_SERIAL_MAJOR,
1233 .minor = BFIN_SERIAL_MINOR,
1234 .nr = BFIN_UART_NR_PORTS,
1235 .cons = BFIN_SERIAL_CONSOLE,
1236 };
1237
1238 static int bfin_serial_suspend(struct platform_device *pdev, pm_message_t state)
1239 {
1240 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1241
1242 return uart_suspend_port(&bfin_serial_reg, &uart->port);
1243 }
1244
1245 static int bfin_serial_resume(struct platform_device *pdev)
1246 {
1247 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1248
1249 return uart_resume_port(&bfin_serial_reg, &uart->port);
1250 }
1251
1252 static int bfin_serial_probe(struct platform_device *pdev)
1253 {
1254 struct resource *res;
1255 struct bfin_serial_port *uart = NULL;
1256 int ret = 0;
1257
1258 if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1259 dev_err(&pdev->dev, "Wrong bfin uart platform device id.\n");
1260 return -ENOENT;
1261 }
1262
1263 if (bfin_serial_ports[pdev->id] == NULL) {
1264
1265 uart = kzalloc(sizeof(*uart), GFP_KERNEL);
1266 if (!uart) {
1267 dev_err(&pdev->dev,
1268 "fail to malloc bfin_serial_port\n");
1269 return -ENOMEM;
1270 }
1271 bfin_serial_ports[pdev->id] = uart;
1272
1273 #ifdef CONFIG_EARLY_PRINTK
1274 if (!(bfin_earlyprintk_port.port.membase
1275 && bfin_earlyprintk_port.port.line == pdev->id)) {
1276 /*
1277 * If the peripheral PINs of current port is allocated
1278 * in earlyprintk probe stage, don't do it again.
1279 */
1280 #endif
1281 ret = peripheral_request_list(
1282 (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
1283 if (ret) {
1284 dev_err(&pdev->dev,
1285 "fail to request bfin serial peripherals\n");
1286 goto out_error_free_mem;
1287 }
1288 #ifdef CONFIG_EARLY_PRINTK
1289 }
1290 #endif
1291
1292 spin_lock_init(&uart->port.lock);
1293 uart->port.uartclk = get_sclk();
1294 uart->port.fifosize = BFIN_UART_TX_FIFO_SIZE;
1295 uart->port.ops = &bfin_serial_pops;
1296 uart->port.line = pdev->id;
1297 uart->port.iotype = UPIO_MEM;
1298 uart->port.flags = UPF_BOOT_AUTOCONF;
1299
1300 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1301 if (res == NULL) {
1302 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1303 ret = -ENOENT;
1304 goto out_error_free_peripherals;
1305 }
1306
1307 uart->port.membase = ioremap(res->start,
1308 res->end - res->start);
1309 if (!uart->port.membase) {
1310 dev_err(&pdev->dev, "Cannot map uart IO\n");
1311 ret = -ENXIO;
1312 goto out_error_free_peripherals;
1313 }
1314 uart->port.mapbase = res->start;
1315
1316 uart->port.irq = platform_get_irq(pdev, 0);
1317 if (uart->port.irq < 0) {
1318 dev_err(&pdev->dev, "No uart RX/TX IRQ specified\n");
1319 ret = -ENOENT;
1320 goto out_error_unmap;
1321 }
1322
1323 uart->status_irq = platform_get_irq(pdev, 1);
1324 if (uart->status_irq < 0) {
1325 dev_err(&pdev->dev, "No uart status IRQ specified\n");
1326 ret = -ENOENT;
1327 goto out_error_unmap;
1328 }
1329
1330 #ifdef CONFIG_SERIAL_BFIN_DMA
1331 spin_lock_init(&uart->rx_lock);
1332 uart->tx_done = 1;
1333 uart->tx_count = 0;
1334
1335 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1336 if (res == NULL) {
1337 dev_err(&pdev->dev, "No uart TX DMA channel specified\n");
1338 ret = -ENOENT;
1339 goto out_error_unmap;
1340 }
1341 uart->tx_dma_channel = res->start;
1342
1343 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1344 if (res == NULL) {
1345 dev_err(&pdev->dev, "No uart RX DMA channel specified\n");
1346 ret = -ENOENT;
1347 goto out_error_unmap;
1348 }
1349 uart->rx_dma_channel = res->start;
1350
1351 init_timer(&(uart->rx_dma_timer));
1352 #endif
1353
1354 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1355 defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1356 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
1357 if (res == NULL)
1358 uart->cts_pin = -1;
1359 else
1360 uart->cts_pin = res->start;
1361
1362 res = platform_get_resource(pdev, IORESOURCE_IO, 1);
1363 if (res == NULL)
1364 uart->rts_pin = -1;
1365 else
1366 uart->rts_pin = res->start;
1367 # if defined(CONFIG_SERIAL_BFIN_CTSRTS)
1368 if (uart->rts_pin >= 0)
1369 gpio_request(uart->rts_pin, DRIVER_NAME);
1370 # endif
1371 #endif
1372 }
1373
1374 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1375 if (!is_early_platform_device(pdev)) {
1376 #endif
1377 uart = bfin_serial_ports[pdev->id];
1378 uart->port.dev = &pdev->dev;
1379 dev_set_drvdata(&pdev->dev, uart);
1380 ret = uart_add_one_port(&bfin_serial_reg, &uart->port);
1381 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1382 }
1383 #endif
1384
1385 if (!ret)
1386 return 0;
1387
1388 if (uart) {
1389 out_error_unmap:
1390 iounmap(uart->port.membase);
1391 out_error_free_peripherals:
1392 peripheral_free_list(
1393 (unsigned short *)pdev->dev.platform_data);
1394 out_error_free_mem:
1395 kfree(uart);
1396 bfin_serial_ports[pdev->id] = NULL;
1397 }
1398
1399 return ret;
1400 }
1401
1402 static int __devexit bfin_serial_remove(struct platform_device *pdev)
1403 {
1404 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1405
1406 dev_set_drvdata(&pdev->dev, NULL);
1407
1408 if (uart) {
1409 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1410 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1411 if (uart->rts_pin >= 0)
1412 gpio_free(uart->rts_pin);
1413 #endif
1414 iounmap(uart->port.membase);
1415 peripheral_free_list(
1416 (unsigned short *)pdev->dev.platform_data);
1417 kfree(uart);
1418 bfin_serial_ports[pdev->id] = NULL;
1419 }
1420
1421 return 0;
1422 }
1423
1424 static struct platform_driver bfin_serial_driver = {
1425 .probe = bfin_serial_probe,
1426 .remove = __devexit_p(bfin_serial_remove),
1427 .suspend = bfin_serial_suspend,
1428 .resume = bfin_serial_resume,
1429 .driver = {
1430 .name = DRIVER_NAME,
1431 .owner = THIS_MODULE,
1432 },
1433 };
1434
1435 #if defined(CONFIG_SERIAL_BFIN_CONSOLE)
1436 static __initdata struct early_platform_driver early_bfin_serial_driver = {
1437 .class_str = CLASS_BFIN_CONSOLE,
1438 .pdrv = &bfin_serial_driver,
1439 .requested_id = EARLY_PLATFORM_ID_UNSET,
1440 };
1441
1442 static int __init bfin_serial_rs_console_init(void)
1443 {
1444 early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME);
1445
1446 early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0);
1447
1448 register_console(&bfin_serial_console);
1449
1450 return 0;
1451 }
1452 console_initcall(bfin_serial_rs_console_init);
1453 #endif
1454
1455 #ifdef CONFIG_EARLY_PRINTK
1456 /*
1457 * Memory can't be allocated dynamically during earlyprink init stage.
1458 * So, do individual probe for earlyprink with a static uart port variable.
1459 */
1460 static int bfin_earlyprintk_probe(struct platform_device *pdev)
1461 {
1462 struct resource *res;
1463 int ret;
1464
1465 if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1466 dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n");
1467 return -ENOENT;
1468 }
1469
1470 ret = peripheral_request_list(
1471 (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
1472 if (ret) {
1473 dev_err(&pdev->dev,
1474 "fail to request bfin serial peripherals\n");
1475 return ret;
1476 }
1477
1478 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1479 if (res == NULL) {
1480 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1481 ret = -ENOENT;
1482 goto out_error_free_peripherals;
1483 }
1484
1485 bfin_earlyprintk_port.port.membase = ioremap(res->start,
1486 res->end - res->start);
1487 if (!bfin_earlyprintk_port.port.membase) {
1488 dev_err(&pdev->dev, "Cannot map uart IO\n");
1489 ret = -ENXIO;
1490 goto out_error_free_peripherals;
1491 }
1492 bfin_earlyprintk_port.port.mapbase = res->start;
1493 bfin_earlyprintk_port.port.line = pdev->id;
1494 bfin_earlyprintk_port.port.uartclk = get_sclk();
1495 bfin_earlyprintk_port.port.fifosize = BFIN_UART_TX_FIFO_SIZE;
1496 spin_lock_init(&bfin_earlyprintk_port.port.lock);
1497
1498 return 0;
1499
1500 out_error_free_peripherals:
1501 peripheral_free_list(
1502 (unsigned short *)pdev->dev.platform_data);
1503
1504 return ret;
1505 }
1506
1507 static struct platform_driver bfin_earlyprintk_driver = {
1508 .probe = bfin_earlyprintk_probe,
1509 .driver = {
1510 .name = DRIVER_NAME,
1511 .owner = THIS_MODULE,
1512 },
1513 };
1514
1515 static __initdata struct early_platform_driver early_bfin_earlyprintk_driver = {
1516 .class_str = CLASS_BFIN_EARLYPRINTK,
1517 .pdrv = &bfin_earlyprintk_driver,
1518 .requested_id = EARLY_PLATFORM_ID_UNSET,
1519 };
1520
1521 struct console __init *bfin_earlyserial_init(unsigned int port,
1522 unsigned int cflag)
1523 {
1524 struct ktermios t;
1525 char port_name[20];
1526
1527 if (port < 0 || port >= BFIN_UART_NR_PORTS)
1528 return NULL;
1529
1530 /*
1531 * Only probe resource of the given port in earlyprintk boot arg.
1532 * The expected port id should be indicated in port name string.
1533 */
1534 snprintf(port_name, 20, DRIVER_NAME ".%d", port);
1535 early_platform_driver_register(&early_bfin_earlyprintk_driver,
1536 port_name);
1537 early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0);
1538
1539 if (!bfin_earlyprintk_port.port.membase)
1540 return NULL;
1541
1542 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1543 /*
1544 * If we are using early serial, don't let the normal console rewind
1545 * log buffer, since that causes things to be printed multiple times
1546 */
1547 bfin_serial_console.flags &= ~CON_PRINTBUFFER;
1548 #endif
1549
1550 bfin_early_serial_console.index = port;
1551 t.c_cflag = cflag;
1552 t.c_iflag = 0;
1553 t.c_oflag = 0;
1554 t.c_lflag = ICANON;
1555 t.c_line = port;
1556 bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t);
1557
1558 return &bfin_early_serial_console;
1559 }
1560 #endif /* CONFIG_EARLY_PRINTK */
1561
1562 static int __init bfin_serial_init(void)
1563 {
1564 int ret;
1565
1566 pr_info("Blackfin serial driver\n");
1567
1568 ret = uart_register_driver(&bfin_serial_reg);
1569 if (ret) {
1570 pr_err("failed to register %s:%d\n",
1571 bfin_serial_reg.driver_name, ret);
1572 }
1573
1574 ret = platform_driver_register(&bfin_serial_driver);
1575 if (ret) {
1576 pr_err("fail to register bfin uart\n");
1577 uart_unregister_driver(&bfin_serial_reg);
1578 }
1579
1580 return ret;
1581 }
1582
1583 static void __exit bfin_serial_exit(void)
1584 {
1585 platform_driver_unregister(&bfin_serial_driver);
1586 uart_unregister_driver(&bfin_serial_reg);
1587 }
1588
1589
1590 module_init(bfin_serial_init);
1591 module_exit(bfin_serial_exit);
1592
1593 MODULE_AUTHOR("Sonic Zhang, Aubrey Li");
1594 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1595 MODULE_LICENSE("GPL");
1596 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1597 MODULE_ALIAS("platform:bfin-uart");
Linux with added FPC-III support