projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
serial: bfin-uart: Don't access tty circular buffer in TX DMA interrupt after it...
[deliverable/linux.git] / drivers / tty / serial / bfin_uart.c
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 = bfin_serial_get_mctrl(&uart->port);
120 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
121 struct tty_struct *tty = uart->port.state->port.tty;
122
123 UART_CLEAR_SCTS(uart);
124 if (tty->hw_stopped) {
125 if (status) {
126 tty->hw_stopped = 0;
127 uart_write_wakeup(&uart->port);
128 }
129 } else {
130 if (!status)
131 tty->hw_stopped = 1;
132 }
133 #endif
134 uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
135
136 return IRQ_HANDLED;
137 }
138 #else
139 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
140 {
141 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
142 }
143
144 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
145 {
146 }
147 #endif
148
149 /*
150 * interrupts are disabled on entry
151 */
152 static void bfin_serial_stop_tx(struct uart_port *port)
153 {
154 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
155 #ifdef CONFIG_SERIAL_BFIN_DMA
156 struct circ_buf *xmit = &uart->port.state->xmit;
157 #endif
158
159 while (!(UART_GET_LSR(uart) & TEMT))
160 cpu_relax();
161
162 #ifdef CONFIG_SERIAL_BFIN_DMA
163 disable_dma(uart->tx_dma_channel);
164 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
165 uart->port.icount.tx += uart->tx_count;
166 uart->tx_count = 0;
167 uart->tx_done = 1;
168 #else
169 #ifdef CONFIG_BF54x
170 /* Clear TFI bit */
171 UART_PUT_LSR(uart, TFI);
172 #endif
173 UART_CLEAR_IER(uart, ETBEI);
174 #endif
175 }
176
177 /*
178 * port is locked and interrupts are disabled
179 */
180 static void bfin_serial_start_tx(struct uart_port *port)
181 {
182 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
183 struct tty_struct *tty = uart->port.state->port.tty;
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 spin_lock(&uart->port.lock);
384 if (UART_GET_LSR(uart) & THRE)
385 bfin_serial_tx_chars(uart);
386 spin_unlock(&uart->port.lock);
387
388 return IRQ_HANDLED;
389 }
390 #endif
391
392 #ifdef CONFIG_SERIAL_BFIN_DMA
393 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
394 {
395 struct circ_buf *xmit = &uart->port.state->xmit;
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 uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
412 if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
413 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
414 blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
415 (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
416 set_dma_config(uart->tx_dma_channel,
417 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
418 INTR_ON_BUF,
419 DIMENSION_LINEAR,
420 DATA_SIZE_8,
421 DMA_SYNC_RESTART));
422 set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
423 set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
424 set_dma_x_modify(uart->tx_dma_channel, 1);
425 SSYNC();
426 enable_dma(uart->tx_dma_channel);
427
428 UART_SET_IER(uart, ETBEI);
429 }
430
431 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
432 {
433 struct tty_struct *tty = uart->port.state->port.tty;
434 int i, flg, status;
435
436 status = UART_GET_LSR(uart);
437 UART_CLEAR_LSR(uart);
438
439 uart->port.icount.rx +=
440 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
441 UART_XMIT_SIZE);
442
443 if (status & BI) {
444 uart->port.icount.brk++;
445 if (uart_handle_break(&uart->port))
446 goto dma_ignore_char;
447 status &= ~(PE | FE);
448 }
449 if (status & PE)
450 uart->port.icount.parity++;
451 if (status & OE)
452 uart->port.icount.overrun++;
453 if (status & FE)
454 uart->port.icount.frame++;
455
456 status &= uart->port.read_status_mask;
457
458 if (status & BI)
459 flg = TTY_BREAK;
460 else if (status & PE)
461 flg = TTY_PARITY;
462 else if (status & FE)
463 flg = TTY_FRAME;
464 else
465 flg = TTY_NORMAL;
466
467 for (i = uart->rx_dma_buf.tail; ; i++) {
468 if (i >= UART_XMIT_SIZE)
469 i = 0;
470 if (i == uart->rx_dma_buf.head)
471 break;
472 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
473 uart_insert_char(&uart->port, status, OE,
474 uart->rx_dma_buf.buf[i], flg);
475 }
476
477 dma_ignore_char:
478 tty_flip_buffer_push(tty);
479 }
480
481 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
482 {
483 int x_pos, pos;
484
485 dma_disable_irq_nosync(uart->rx_dma_channel);
486 spin_lock_bh(&uart->rx_lock);
487
488 /* 2D DMA RX buffer ring is used. Because curr_y_count and
489 * curr_x_count can't be read as an atomic operation,
490 * curr_y_count should be read before curr_x_count. When
491 * curr_x_count is read, curr_y_count may already indicate
492 * next buffer line. But, the position calculated here is
493 * still indicate the old line. The wrong position data may
494 * be smaller than current buffer tail, which cause garbages
495 * are received if it is not prohibit.
496 */
497 uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
498 x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
499 uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
500 if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
501 uart->rx_dma_nrows = 0;
502 x_pos = DMA_RX_XCOUNT - x_pos;
503 if (x_pos == DMA_RX_XCOUNT)
504 x_pos = 0;
505
506 pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
507 /* Ignore receiving data if new position is in the same line of
508 * current buffer tail and small.
509 */
510 if (pos > uart->rx_dma_buf.tail ||
511 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
512 uart->rx_dma_buf.head = pos;
513 bfin_serial_dma_rx_chars(uart);
514 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
515 }
516
517 spin_unlock_bh(&uart->rx_lock);
518 dma_enable_irq(uart->rx_dma_channel);
519
520 mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
521 }
522
523 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
524 {
525 struct bfin_serial_port *uart = dev_id;
526 struct circ_buf *xmit = &uart->port.state->xmit;
527
528 spin_lock(&uart->port.lock);
529 if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
530 disable_dma(uart->tx_dma_channel);
531 clear_dma_irqstat(uart->tx_dma_channel);
532 /* Anomaly notes:
533 * 05000215 - we always clear ETBEI within last UART TX
534 * interrupt to end a string. It is always set
535 * when start a new tx.
536 */
537 UART_CLEAR_IER(uart, ETBEI);
538 uart->port.icount.tx += uart->tx_count;
539 if (!uart_circ_empty(xmit)) {
540 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
541
542 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
543 uart_write_wakeup(&uart->port);
544 }
545
546 bfin_serial_dma_tx_chars(uart);
547 }
548
549 spin_unlock(&uart->port.lock);
550 return IRQ_HANDLED;
551 }
552
553 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
554 {
555 struct bfin_serial_port *uart = dev_id;
556 unsigned short irqstat;
557 int x_pos, pos;
558
559 spin_lock(&uart->rx_lock);
560 irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
561 clear_dma_irqstat(uart->rx_dma_channel);
562
563 uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
564 x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
565 uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
566 if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
567 uart->rx_dma_nrows = 0;
568
569 pos = uart->rx_dma_nrows * DMA_RX_XCOUNT;
570 if (pos > uart->rx_dma_buf.tail ||
571 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
572 uart->rx_dma_buf.head = pos;
573 bfin_serial_dma_rx_chars(uart);
574 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
575 }
576
577 spin_unlock(&uart->rx_lock);
578
579 return IRQ_HANDLED;
580 }
581 #endif
582
583 /*
584 * Return TIOCSER_TEMT when transmitter is not busy.
585 */
586 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
587 {
588 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
589 unsigned short lsr;
590
591 lsr = UART_GET_LSR(uart);
592 if (lsr & TEMT)
593 return TIOCSER_TEMT;
594 else
595 return 0;
596 }
597
598 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
599 {
600 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
601 u16 lcr = UART_GET_LCR(uart);
602 if (break_state)
603 lcr |= SB;
604 else
605 lcr &= ~SB;
606 UART_PUT_LCR(uart, lcr);
607 SSYNC();
608 }
609
610 static int bfin_serial_startup(struct uart_port *port)
611 {
612 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
613
614 #ifdef CONFIG_SERIAL_BFIN_DMA
615 dma_addr_t dma_handle;
616
617 if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
618 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
619 return -EBUSY;
620 }
621
622 if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
623 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
624 free_dma(uart->rx_dma_channel);
625 return -EBUSY;
626 }
627
628 set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
629 set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
630
631 uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
632 uart->rx_dma_buf.head = 0;
633 uart->rx_dma_buf.tail = 0;
634 uart->rx_dma_nrows = 0;
635
636 set_dma_config(uart->rx_dma_channel,
637 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
638 INTR_ON_ROW, DIMENSION_2D,
639 DATA_SIZE_8,
640 DMA_SYNC_RESTART));
641 set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
642 set_dma_x_modify(uart->rx_dma_channel, 1);
643 set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
644 set_dma_y_modify(uart->rx_dma_channel, 1);
645 set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
646 enable_dma(uart->rx_dma_channel);
647
648 uart->rx_dma_timer.data = (unsigned long)(uart);
649 uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
650 uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
651 add_timer(&(uart->rx_dma_timer));
652 #else
653 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
654 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
655 if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
656 kgdboc_break_enabled = 0;
657 else {
658 # endif
659 if (request_irq(uart->rx_irq, bfin_serial_rx_int, 0,
660 "BFIN_UART_RX", uart)) {
661 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
662 return -EBUSY;
663 }
664
665 if (request_irq
666 (uart->tx_irq, bfin_serial_tx_int, 0,
667 "BFIN_UART_TX", uart)) {
668 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
669 free_irq(uart->rx_irq, uart);
670 return -EBUSY;
671 }
672
673 # ifdef CONFIG_BF54x
674 {
675 /*
676 * UART2 and UART3 on BF548 share interrupt PINs and DMA
677 * controllers with SPORT2 and SPORT3. UART rx and tx
678 * interrupts are generated in PIO mode only when configure
679 * their peripheral mapping registers properly, which means
680 * request corresponding DMA channels in PIO mode as well.
681 */
682 unsigned uart_dma_ch_rx, uart_dma_ch_tx;
683
684 switch (uart->rx_irq) {
685 case IRQ_UART3_RX:
686 uart_dma_ch_rx = CH_UART3_RX;
687 uart_dma_ch_tx = CH_UART3_TX;
688 break;
689 case IRQ_UART2_RX:
690 uart_dma_ch_rx = CH_UART2_RX;
691 uart_dma_ch_tx = CH_UART2_TX;
692 break;
693 default:
694 uart_dma_ch_rx = uart_dma_ch_tx = 0;
695 break;
696 };
697
698 if (uart_dma_ch_rx &&
699 request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
700 printk(KERN_NOTICE"Fail to attach UART interrupt\n");
701 free_irq(uart->rx_irq, uart);
702 free_irq(uart->tx_irq, uart);
703 return -EBUSY;
704 }
705 if (uart_dma_ch_tx &&
706 request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
707 printk(KERN_NOTICE "Fail to attach UART interrupt\n");
708 free_dma(uart_dma_ch_rx);
709 free_irq(uart->rx_irq, uart);
710 free_irq(uart->tx_irq, uart);
711 return -EBUSY;
712 }
713 }
714 # endif
715 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
716 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
717 }
718 # endif
719 #endif
720
721 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
722 if (uart->cts_pin >= 0) {
723 if (request_irq(gpio_to_irq(uart->cts_pin),
724 bfin_serial_mctrl_cts_int,
725 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
726 0, "BFIN_UART_CTS", uart)) {
727 uart->cts_pin = -1;
728 pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n");
729 }
730 }
731 if (uart->rts_pin >= 0) {
732 if (gpio_request(uart->rts_pin, DRIVER_NAME)) {
733 pr_info("fail to request RTS PIN at GPIO_%d\n", uart->rts_pin);
734 uart->rts_pin = -1;
735 } else
736 gpio_direction_output(uart->rts_pin, 0);
737 }
738 #endif
739 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
740 if (uart->cts_pin >= 0) {
741 if (request_irq(uart->status_irq, bfin_serial_mctrl_cts_int,
742 IRQF_DISABLED, "BFIN_UART_MODEM_STATUS", uart)) {
743 uart->cts_pin = -1;
744 dev_info(port->dev, "Unable to attach BlackFin UART Modem Status interrupt.\n");
745 }
746
747 /* CTS RTS PINs are negative assertive. */
748 UART_PUT_MCR(uart, ACTS);
749 UART_SET_IER(uart, EDSSI);
750 }
751 #endif
752
753 UART_SET_IER(uart, ERBFI);
754 return 0;
755 }
756
757 static void bfin_serial_shutdown(struct uart_port *port)
758 {
759 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
760
761 #ifdef CONFIG_SERIAL_BFIN_DMA
762 disable_dma(uart->tx_dma_channel);
763 free_dma(uart->tx_dma_channel);
764 disable_dma(uart->rx_dma_channel);
765 free_dma(uart->rx_dma_channel);
766 del_timer(&(uart->rx_dma_timer));
767 dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
768 #else
769 #ifdef CONFIG_BF54x
770 switch (uart->port.irq) {
771 case IRQ_UART3_RX:
772 free_dma(CH_UART3_RX);
773 free_dma(CH_UART3_TX);
774 break;
775 case IRQ_UART2_RX:
776 free_dma(CH_UART2_RX);
777 free_dma(CH_UART2_TX);
778 break;
779 default:
780 break;
781 };
782 #endif
783 free_irq(uart->rx_irq, uart);
784 free_irq(uart->tx_irq, uart);
785 #endif
786
787 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
788 if (uart->cts_pin >= 0)
789 free_irq(gpio_to_irq(uart->cts_pin), uart);
790 if (uart->rts_pin >= 0)
791 gpio_free(uart->rts_pin);
792 #endif
793 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
794 if (uart->cts_pin >= 0)
795 free_irq(uart->status_irq, uart);
796 #endif
797 }
798
799 static void
800 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
801 struct ktermios *old)
802 {
803 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
804 unsigned long flags;
805 unsigned int baud, quot;
806 unsigned short val, ier, lcr = 0;
807
808 switch (termios->c_cflag & CSIZE) {
809 case CS8:
810 lcr = WLS(8);
811 break;
812 case CS7:
813 lcr = WLS(7);
814 break;
815 case CS6:
816 lcr = WLS(6);
817 break;
818 case CS5:
819 lcr = WLS(5);
820 break;
821 default:
822 printk(KERN_ERR "%s: word lengh not supported\n",
823 __func__);
824 }
825
826 /* Anomaly notes:
827 * 05000231 - STOP bit is always set to 1 whatever the user is set.
828 */
829 if (termios->c_cflag & CSTOPB) {
830 if (ANOMALY_05000231)
831 printk(KERN_WARNING "STOP bits other than 1 is not "
832 "supported in case of anomaly 05000231.\n");
833 else
834 lcr |= STB;
835 }
836 if (termios->c_cflag & PARENB)
837 lcr |= PEN;
838 if (!(termios->c_cflag & PARODD))
839 lcr |= EPS;
840 if (termios->c_cflag & CMSPAR)
841 lcr |= STP;
842
843 spin_lock_irqsave(&uart->port.lock, flags);
844
845 port->read_status_mask = OE;
846 if (termios->c_iflag & INPCK)
847 port->read_status_mask |= (FE | PE);
848 if (termios->c_iflag & (BRKINT | PARMRK))
849 port->read_status_mask |= BI;
850
851 /*
852 * Characters to ignore
853 */
854 port->ignore_status_mask = 0;
855 if (termios->c_iflag & IGNPAR)
856 port->ignore_status_mask |= FE | PE;
857 if (termios->c_iflag & IGNBRK) {
858 port->ignore_status_mask |= BI;
859 /*
860 * If we're ignoring parity and break indicators,
861 * ignore overruns too (for real raw support).
862 */
863 if (termios->c_iflag & IGNPAR)
864 port->ignore_status_mask |= OE;
865 }
866
867 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
868 quot = uart_get_divisor(port, baud);
869
870 /* If discipline is not IRDA, apply ANOMALY_05000230 */
871 if (termios->c_line != N_IRDA)
872 quot -= ANOMALY_05000230;
873
874 UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
875
876 /* Disable UART */
877 ier = UART_GET_IER(uart);
878 UART_DISABLE_INTS(uart);
879
880 /* Set DLAB in LCR to Access DLL and DLH */
881 UART_SET_DLAB(uart);
882
883 UART_PUT_DLL(uart, quot & 0xFF);
884 UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
885 SSYNC();
886
887 /* Clear DLAB in LCR to Access THR RBR IER */
888 UART_CLEAR_DLAB(uart);
889
890 UART_PUT_LCR(uart, lcr);
891
892 /* Enable UART */
893 UART_ENABLE_INTS(uart, ier);
894
895 val = UART_GET_GCTL(uart);
896 val |= UCEN;
897 UART_PUT_GCTL(uart, val);
898
899 /* Port speed changed, update the per-port timeout. */
900 uart_update_timeout(port, termios->c_cflag, baud);
901
902 spin_unlock_irqrestore(&uart->port.lock, flags);
903 }
904
905 static const char *bfin_serial_type(struct uart_port *port)
906 {
907 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
908
909 return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
910 }
911
912 /*
913 * Release the memory region(s) being used by 'port'.
914 */
915 static void bfin_serial_release_port(struct uart_port *port)
916 {
917 }
918
919 /*
920 * Request the memory region(s) being used by 'port'.
921 */
922 static int bfin_serial_request_port(struct uart_port *port)
923 {
924 return 0;
925 }
926
927 /*
928 * Configure/autoconfigure the port.
929 */
930 static void bfin_serial_config_port(struct uart_port *port, int flags)
931 {
932 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
933
934 if (flags & UART_CONFIG_TYPE &&
935 bfin_serial_request_port(&uart->port) == 0)
936 uart->port.type = PORT_BFIN;
937 }
938
939 /*
940 * Verify the new serial_struct (for TIOCSSERIAL).
941 * The only change we allow are to the flags and type, and
942 * even then only between PORT_BFIN and PORT_UNKNOWN
943 */
944 static int
945 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
946 {
947 return 0;
948 }
949
950 /*
951 * Enable the IrDA function if tty->ldisc.num is N_IRDA.
952 * In other cases, disable IrDA function.
953 */
954 static void bfin_serial_set_ldisc(struct uart_port *port, int ld)
955 {
956 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
957 unsigned short val;
958
959 switch (ld) {
960 case N_IRDA:
961 val = UART_GET_GCTL(uart);
962 val |= (IREN | RPOLC);
963 UART_PUT_GCTL(uart, val);
964 break;
965 default:
966 val = UART_GET_GCTL(uart);
967 val &= ~(IREN | RPOLC);
968 UART_PUT_GCTL(uart, val);
969 }
970 }
971
972 static void bfin_serial_reset_irda(struct uart_port *port)
973 {
974 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
975 unsigned short val;
976
977 val = UART_GET_GCTL(uart);
978 val &= ~(IREN | RPOLC);
979 UART_PUT_GCTL(uart, val);
980 SSYNC();
981 val |= (IREN | RPOLC);
982 UART_PUT_GCTL(uart, val);
983 SSYNC();
984 }
985
986 #ifdef CONFIG_CONSOLE_POLL
987 /* Anomaly notes:
988 * 05000099 - Because we only use THRE in poll_put and DR in poll_get,
989 * losing other bits of UART_LSR is not a problem here.
990 */
991 static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
992 {
993 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
994
995 while (!(UART_GET_LSR(uart) & THRE))
996 cpu_relax();
997
998 UART_CLEAR_DLAB(uart);
999 UART_PUT_CHAR(uart, (unsigned char)chr);
1000 }
1001
1002 static int bfin_serial_poll_get_char(struct uart_port *port)
1003 {
1004 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1005 unsigned char chr;
1006
1007 while (!(UART_GET_LSR(uart) & DR))
1008 cpu_relax();
1009
1010 UART_CLEAR_DLAB(uart);
1011 chr = UART_GET_CHAR(uart);
1012
1013 return chr;
1014 }
1015 #endif
1016
1017 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
1018 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
1019 static void bfin_kgdboc_port_shutdown(struct uart_port *port)
1020 {
1021 if (kgdboc_break_enabled) {
1022 kgdboc_break_enabled = 0;
1023 bfin_serial_shutdown(port);
1024 }
1025 }
1026
1027 static int bfin_kgdboc_port_startup(struct uart_port *port)
1028 {
1029 kgdboc_port_line = port->line;
1030 kgdboc_break_enabled = !bfin_serial_startup(port);
1031 return 0;
1032 }
1033 #endif
1034
1035 static struct uart_ops bfin_serial_pops = {
1036 .tx_empty = bfin_serial_tx_empty,
1037 .set_mctrl = bfin_serial_set_mctrl,
1038 .get_mctrl = bfin_serial_get_mctrl,
1039 .stop_tx = bfin_serial_stop_tx,
1040 .start_tx = bfin_serial_start_tx,
1041 .stop_rx = bfin_serial_stop_rx,
1042 .enable_ms = bfin_serial_enable_ms,
1043 .break_ctl = bfin_serial_break_ctl,
1044 .startup = bfin_serial_startup,
1045 .shutdown = bfin_serial_shutdown,
1046 .set_termios = bfin_serial_set_termios,
1047 .set_ldisc = bfin_serial_set_ldisc,
1048 .type = bfin_serial_type,
1049 .release_port = bfin_serial_release_port,
1050 .request_port = bfin_serial_request_port,
1051 .config_port = bfin_serial_config_port,
1052 .verify_port = bfin_serial_verify_port,
1053 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
1054 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
1055 .kgdboc_port_startup = bfin_kgdboc_port_startup,
1056 .kgdboc_port_shutdown = bfin_kgdboc_port_shutdown,
1057 #endif
1058 #ifdef CONFIG_CONSOLE_POLL
1059 .poll_put_char = bfin_serial_poll_put_char,
1060 .poll_get_char = bfin_serial_poll_get_char,
1061 #endif
1062 };
1063
1064 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1065 /*
1066 * If the port was already initialised (eg, by a boot loader),
1067 * try to determine the current setup.
1068 */
1069 static void __init
1070 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
1071 int *parity, int *bits)
1072 {
1073 unsigned short status;
1074
1075 status = UART_GET_IER(uart) & (ERBFI | ETBEI);
1076 if (status == (ERBFI | ETBEI)) {
1077 /* ok, the port was enabled */
1078 u16 lcr, dlh, dll;
1079
1080 lcr = UART_GET_LCR(uart);
1081
1082 *parity = 'n';
1083 if (lcr & PEN) {
1084 if (lcr & EPS)
1085 *parity = 'e';
1086 else
1087 *parity = 'o';
1088 }
1089 switch (lcr & 0x03) {
1090 case 0:
1091 *bits = 5;
1092 break;
1093 case 1:
1094 *bits = 6;
1095 break;
1096 case 2:
1097 *bits = 7;
1098 break;
1099 case 3:
1100 *bits = 8;
1101 break;
1102 }
1103 /* Set DLAB in LCR to Access DLL and DLH */
1104 UART_SET_DLAB(uart);
1105
1106 dll = UART_GET_DLL(uart);
1107 dlh = UART_GET_DLH(uart);
1108
1109 /* Clear DLAB in LCR to Access THR RBR IER */
1110 UART_CLEAR_DLAB(uart);
1111
1112 *baud = get_sclk() / (16*(dll | dlh << 8));
1113 }
1114 pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
1115 }
1116
1117 static struct uart_driver bfin_serial_reg;
1118
1119 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1120 {
1121 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1122 while (!(UART_GET_LSR(uart) & THRE))
1123 barrier();
1124 UART_PUT_CHAR(uart, ch);
1125 }
1126
1127 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1128 defined (CONFIG_EARLY_PRINTK) */
1129
1130 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1131 #define CLASS_BFIN_CONSOLE "bfin-console"
1132 /*
1133 * Interrupts are disabled on entering
1134 */
1135 static void
1136 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1137 {
1138 struct bfin_serial_port *uart = bfin_serial_ports[co->index];
1139 unsigned long flags;
1140
1141 spin_lock_irqsave(&uart->port.lock, flags);
1142 uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1143 spin_unlock_irqrestore(&uart->port.lock, flags);
1144
1145 }
1146
1147 static int __init
1148 bfin_serial_console_setup(struct console *co, char *options)
1149 {
1150 struct bfin_serial_port *uart;
1151 int baud = 57600;
1152 int bits = 8;
1153 int parity = 'n';
1154 # if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1155 defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1156 int flow = 'r';
1157 # else
1158 int flow = 'n';
1159 # endif
1160
1161 /*
1162 * Check whether an invalid uart number has been specified, and
1163 * if so, search for the first available port that does have
1164 * console support.
1165 */
1166 if (co->index < 0 || co->index >= BFIN_UART_NR_PORTS)
1167 return -ENODEV;
1168
1169 uart = bfin_serial_ports[co->index];
1170 if (!uart)
1171 return -ENODEV;
1172
1173 if (options)
1174 uart_parse_options(options, &baud, &parity, &bits, &flow);
1175 else
1176 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1177
1178 return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1179 }
1180
1181 static struct console bfin_serial_console = {
1182 .name = BFIN_SERIAL_DEV_NAME,
1183 .write = bfin_serial_console_write,
1184 .device = uart_console_device,
1185 .setup = bfin_serial_console_setup,
1186 .flags = CON_PRINTBUFFER,
1187 .index = -1,
1188 .data = &bfin_serial_reg,
1189 };
1190 #define BFIN_SERIAL_CONSOLE (&bfin_serial_console)
1191 #else
1192 #define BFIN_SERIAL_CONSOLE NULL
1193 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1194
1195 #ifdef CONFIG_EARLY_PRINTK
1196 static struct bfin_serial_port bfin_earlyprintk_port;
1197 #define CLASS_BFIN_EARLYPRINTK "bfin-earlyprintk"
1198
1199 /*
1200 * Interrupts are disabled on entering
1201 */
1202 static void
1203 bfin_earlyprintk_console_write(struct console *co, const char *s, unsigned int count)
1204 {
1205 unsigned long flags;
1206
1207 if (bfin_earlyprintk_port.port.line != co->index)
1208 return;
1209
1210 spin_lock_irqsave(&bfin_earlyprintk_port.port.lock, flags);
1211 uart_console_write(&bfin_earlyprintk_port.port, s, count,
1212 bfin_serial_console_putchar);
1213 spin_unlock_irqrestore(&bfin_earlyprintk_port.port.lock, flags);
1214 }
1215
1216 /*
1217 * This should have a .setup or .early_setup in it, but then things get called
1218 * without the command line options, and the baud rate gets messed up - so
1219 * don't let the common infrastructure play with things. (see calls to setup
1220 * & earlysetup in ./kernel/printk.c:register_console()
1221 */
1222 static struct __initdata console bfin_early_serial_console = {
1223 .name = "early_BFuart",
1224 .write = bfin_earlyprintk_console_write,
1225 .device = uart_console_device,
1226 .flags = CON_PRINTBUFFER,
1227 .index = -1,
1228 .data = &bfin_serial_reg,
1229 };
1230 #endif
1231
1232 static struct uart_driver bfin_serial_reg = {
1233 .owner = THIS_MODULE,
1234 .driver_name = DRIVER_NAME,
1235 .dev_name = BFIN_SERIAL_DEV_NAME,
1236 .major = BFIN_SERIAL_MAJOR,
1237 .minor = BFIN_SERIAL_MINOR,
1238 .nr = BFIN_UART_NR_PORTS,
1239 .cons = BFIN_SERIAL_CONSOLE,
1240 };
1241
1242 static int bfin_serial_suspend(struct platform_device *pdev, pm_message_t state)
1243 {
1244 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1245
1246 return uart_suspend_port(&bfin_serial_reg, &uart->port);
1247 }
1248
1249 static int bfin_serial_resume(struct platform_device *pdev)
1250 {
1251 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1252
1253 return uart_resume_port(&bfin_serial_reg, &uart->port);
1254 }
1255
1256 static int bfin_serial_probe(struct platform_device *pdev)
1257 {
1258 struct resource *res;
1259 struct bfin_serial_port *uart = NULL;
1260 int ret = 0;
1261
1262 if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1263 dev_err(&pdev->dev, "Wrong bfin uart platform device id.\n");
1264 return -ENOENT;
1265 }
1266
1267 if (bfin_serial_ports[pdev->id] == NULL) {
1268
1269 uart = kzalloc(sizeof(*uart), GFP_KERNEL);
1270 if (!uart) {
1271 dev_err(&pdev->dev,
1272 "fail to malloc bfin_serial_port\n");
1273 return -ENOMEM;
1274 }
1275 bfin_serial_ports[pdev->id] = uart;
1276
1277 #ifdef CONFIG_EARLY_PRINTK
1278 if (!(bfin_earlyprintk_port.port.membase
1279 && bfin_earlyprintk_port.port.line == pdev->id)) {
1280 /*
1281 * If the peripheral PINs of current port is allocated
1282 * in earlyprintk probe stage, don't do it again.
1283 */
1284 #endif
1285 ret = peripheral_request_list(
1286 (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
1287 if (ret) {
1288 dev_err(&pdev->dev,
1289 "fail to request bfin serial peripherals\n");
1290 goto out_error_free_mem;
1291 }
1292 #ifdef CONFIG_EARLY_PRINTK
1293 }
1294 #endif
1295
1296 spin_lock_init(&uart->port.lock);
1297 uart->port.uartclk = get_sclk();
1298 uart->port.fifosize = BFIN_UART_TX_FIFO_SIZE;
1299 uart->port.ops = &bfin_serial_pops;
1300 uart->port.line = pdev->id;
1301 uart->port.iotype = UPIO_MEM;
1302 uart->port.flags = UPF_BOOT_AUTOCONF;
1303
1304 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1305 if (res == NULL) {
1306 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1307 ret = -ENOENT;
1308 goto out_error_free_peripherals;
1309 }
1310
1311 uart->port.membase = ioremap(res->start, resource_size(res));
1312 if (!uart->port.membase) {
1313 dev_err(&pdev->dev, "Cannot map uart IO\n");
1314 ret = -ENXIO;
1315 goto out_error_free_peripherals;
1316 }
1317 uart->port.mapbase = res->start;
1318
1319 uart->tx_irq = platform_get_irq(pdev, 0);
1320 if (uart->tx_irq < 0) {
1321 dev_err(&pdev->dev, "No uart TX IRQ specified\n");
1322 ret = -ENOENT;
1323 goto out_error_unmap;
1324 }
1325
1326 uart->rx_irq = platform_get_irq(pdev, 1);
1327 if (uart->rx_irq < 0) {
1328 dev_err(&pdev->dev, "No uart RX IRQ specified\n");
1329 ret = -ENOENT;
1330 goto out_error_unmap;
1331 }
1332 uart->port.irq = uart->rx_irq;
1333
1334 uart->status_irq = platform_get_irq(pdev, 2);
1335 if (uart->status_irq < 0) {
1336 dev_err(&pdev->dev, "No uart status IRQ specified\n");
1337 ret = -ENOENT;
1338 goto out_error_unmap;
1339 }
1340
1341 #ifdef CONFIG_SERIAL_BFIN_DMA
1342 spin_lock_init(&uart->rx_lock);
1343 uart->tx_done = 1;
1344 uart->tx_count = 0;
1345
1346 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1347 if (res == NULL) {
1348 dev_err(&pdev->dev, "No uart TX DMA channel specified\n");
1349 ret = -ENOENT;
1350 goto out_error_unmap;
1351 }
1352 uart->tx_dma_channel = res->start;
1353
1354 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1355 if (res == NULL) {
1356 dev_err(&pdev->dev, "No uart RX DMA channel specified\n");
1357 ret = -ENOENT;
1358 goto out_error_unmap;
1359 }
1360 uart->rx_dma_channel = res->start;
1361
1362 init_timer(&(uart->rx_dma_timer));
1363 #endif
1364
1365 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1366 defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1367 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
1368 if (res == NULL)
1369 uart->cts_pin = -1;
1370 else {
1371 uart->cts_pin = res->start;
1372 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
1373 uart->port.flags |= ASYNC_CTS_FLOW;
1374 #endif
1375 }
1376
1377 res = platform_get_resource(pdev, IORESOURCE_IO, 1);
1378 if (res == NULL)
1379 uart->rts_pin = -1;
1380 else
1381 uart->rts_pin = res->start;
1382 #endif
1383 }
1384
1385 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1386 if (!is_early_platform_device(pdev)) {
1387 #endif
1388 uart = bfin_serial_ports[pdev->id];
1389 uart->port.dev = &pdev->dev;
1390 dev_set_drvdata(&pdev->dev, uart);
1391 ret = uart_add_one_port(&bfin_serial_reg, &uart->port);
1392 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1393 }
1394 #endif
1395
1396 if (!ret)
1397 return 0;
1398
1399 if (uart) {
1400 out_error_unmap:
1401 iounmap(uart->port.membase);
1402 out_error_free_peripherals:
1403 peripheral_free_list(
1404 (unsigned short *)pdev->dev.platform_data);
1405 out_error_free_mem:
1406 kfree(uart);
1407 bfin_serial_ports[pdev->id] = NULL;
1408 }
1409
1410 return ret;
1411 }
1412
1413 static int __devexit bfin_serial_remove(struct platform_device *pdev)
1414 {
1415 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1416
1417 dev_set_drvdata(&pdev->dev, NULL);
1418
1419 if (uart) {
1420 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1421 iounmap(uart->port.membase);
1422 peripheral_free_list(
1423 (unsigned short *)pdev->dev.platform_data);
1424 kfree(uart);
1425 bfin_serial_ports[pdev->id] = NULL;
1426 }
1427
1428 return 0;
1429 }
1430
1431 static struct platform_driver bfin_serial_driver = {
1432 .probe = bfin_serial_probe,
1433 .remove = __devexit_p(bfin_serial_remove),
1434 .suspend = bfin_serial_suspend,
1435 .resume = bfin_serial_resume,
1436 .driver = {
1437 .name = DRIVER_NAME,
1438 .owner = THIS_MODULE,
1439 },
1440 };
1441
1442 #if defined(CONFIG_SERIAL_BFIN_CONSOLE)
1443 static __initdata struct early_platform_driver early_bfin_serial_driver = {
1444 .class_str = CLASS_BFIN_CONSOLE,
1445 .pdrv = &bfin_serial_driver,
1446 .requested_id = EARLY_PLATFORM_ID_UNSET,
1447 };
1448
1449 static int __init bfin_serial_rs_console_init(void)
1450 {
1451 early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME);
1452
1453 early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0);
1454
1455 register_console(&bfin_serial_console);
1456
1457 return 0;
1458 }
1459 console_initcall(bfin_serial_rs_console_init);
1460 #endif
1461
1462 #ifdef CONFIG_EARLY_PRINTK
1463 /*
1464 * Memory can't be allocated dynamically during earlyprink init stage.
1465 * So, do individual probe for earlyprink with a static uart port variable.
1466 */
1467 static int bfin_earlyprintk_probe(struct platform_device *pdev)
1468 {
1469 struct resource *res;
1470 int ret;
1471
1472 if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1473 dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n");
1474 return -ENOENT;
1475 }
1476
1477 ret = peripheral_request_list(
1478 (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
1479 if (ret) {
1480 dev_err(&pdev->dev,
1481 "fail to request bfin serial peripherals\n");
1482 return ret;
1483 }
1484
1485 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1486 if (res == NULL) {
1487 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1488 ret = -ENOENT;
1489 goto out_error_free_peripherals;
1490 }
1491
1492 bfin_earlyprintk_port.port.membase = ioremap(res->start,
1493 resource_size(res));
1494 if (!bfin_earlyprintk_port.port.membase) {
1495 dev_err(&pdev->dev, "Cannot map uart IO\n");
1496 ret = -ENXIO;
1497 goto out_error_free_peripherals;
1498 }
1499 bfin_earlyprintk_port.port.mapbase = res->start;
1500 bfin_earlyprintk_port.port.line = pdev->id;
1501 bfin_earlyprintk_port.port.uartclk = get_sclk();
1502 bfin_earlyprintk_port.port.fifosize = BFIN_UART_TX_FIFO_SIZE;
1503 spin_lock_init(&bfin_earlyprintk_port.port.lock);
1504
1505 return 0;
1506
1507 out_error_free_peripherals:
1508 peripheral_free_list(
1509 (unsigned short *)pdev->dev.platform_data);
1510
1511 return ret;
1512 }
1513
1514 static struct platform_driver bfin_earlyprintk_driver = {
1515 .probe = bfin_earlyprintk_probe,
1516 .driver = {
1517 .name = DRIVER_NAME,
1518 .owner = THIS_MODULE,
1519 },
1520 };
1521
1522 static __initdata struct early_platform_driver early_bfin_earlyprintk_driver = {
1523 .class_str = CLASS_BFIN_EARLYPRINTK,
1524 .pdrv = &bfin_earlyprintk_driver,
1525 .requested_id = EARLY_PLATFORM_ID_UNSET,
1526 };
1527
1528 struct console __init *bfin_earlyserial_init(unsigned int port,
1529 unsigned int cflag)
1530 {
1531 struct ktermios t;
1532 char port_name[20];
1533
1534 if (port < 0 || port >= BFIN_UART_NR_PORTS)
1535 return NULL;
1536
1537 /*
1538 * Only probe resource of the given port in earlyprintk boot arg.
1539 * The expected port id should be indicated in port name string.
1540 */
1541 snprintf(port_name, 20, DRIVER_NAME ".%d", port);
1542 early_platform_driver_register(&early_bfin_earlyprintk_driver,
1543 port_name);
1544 early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0);
1545
1546 if (!bfin_earlyprintk_port.port.membase)
1547 return NULL;
1548
1549 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1550 /*
1551 * If we are using early serial, don't let the normal console rewind
1552 * log buffer, since that causes things to be printed multiple times
1553 */
1554 bfin_serial_console.flags &= ~CON_PRINTBUFFER;
1555 #endif
1556
1557 bfin_early_serial_console.index = port;
1558 t.c_cflag = cflag;
1559 t.c_iflag = 0;
1560 t.c_oflag = 0;
1561 t.c_lflag = ICANON;
1562 t.c_line = port;
1563 bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t);
1564
1565 return &bfin_early_serial_console;
1566 }
1567 #endif /* CONFIG_EARLY_PRINTK */
1568
1569 static int __init bfin_serial_init(void)
1570 {
1571 int ret;
1572
1573 pr_info("Blackfin serial driver\n");
1574
1575 ret = uart_register_driver(&bfin_serial_reg);
1576 if (ret) {
1577 pr_err("failed to register %s:%d\n",
1578 bfin_serial_reg.driver_name, ret);
1579 }
1580
1581 ret = platform_driver_register(&bfin_serial_driver);
1582 if (ret) {
1583 pr_err("fail to register bfin uart\n");
1584 uart_unregister_driver(&bfin_serial_reg);
1585 }
1586
1587 return ret;
1588 }
1589
1590 static void __exit bfin_serial_exit(void)
1591 {
1592 platform_driver_unregister(&bfin_serial_driver);
1593 uart_unregister_driver(&bfin_serial_reg);
1594 }
1595
1596
1597 module_init(bfin_serial_init);
1598 module_exit(bfin_serial_exit);
1599
1600 MODULE_AUTHOR("Sonic Zhang, Aubrey Li");
1601 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1602 MODULE_LICENSE("GPL");
1603 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1604 MODULE_ALIAS("platform:bfin-uart");
Linux kernel - Deliverables
This page took 0.081303 seconds and 5 git commands to generate.