1 /*
2 * Blackfin On-Chip Serial Driver
3 *
4 * Copyright 2006-2011 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 #include <asm/bfin_serial.h>
39
40 #ifdef CONFIG_SERIAL_BFIN_MODULE
41 # undef CONFIG_EARLY_PRINTK
42 #endif
43
44 /* UART name and device definitions */
45 #define BFIN_SERIAL_DEV_NAME "ttyBF"
46 #define BFIN_SERIAL_MAJOR 204
47 #define BFIN_SERIAL_MINOR 64
48
49 static struct bfin_serial_port *bfin_serial_ports[BFIN_UART_NR_PORTS];
50
51 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
52 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
53
54 # ifndef CONFIG_SERIAL_BFIN_PIO
55 # error KGDB only support UART in PIO mode.
56 # endif
57
58 static int kgdboc_port_line;
59 static int kgdboc_break_enabled;
60 #endif
61 /*
62 * Setup for console. Argument comes from the menuconfig
63 */
64 #define DMA_RX_XCOUNT 512
65 #define DMA_RX_YCOUNT (PAGE_SIZE / DMA_RX_XCOUNT)
66
67 #define DMA_RX_FLUSH_JIFFIES (HZ / 50)
68
69 #ifdef CONFIG_SERIAL_BFIN_DMA
70 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
71 #else
72 static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
73 #endif
74
75 static void bfin_serial_reset_irda(struct uart_port *port);
76
77 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
78 defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
bfin_serial_get_mctrl(struct uart_port * port)79 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
80 {
81 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
82 if (uart->cts_pin < 0)
83 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
84
85 /* CTS PIN is negative assertive. */
86 if (UART_GET_CTS(uart))
87 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
88 else
89 return TIOCM_DSR | TIOCM_CAR;
90 }
91
bfin_serial_set_mctrl(struct uart_port * port,unsigned int mctrl)92 static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
93 {
94 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
95 if (uart->rts_pin < 0)
96 return;
97
98 /* RTS PIN is negative assertive. */
99 if (mctrl & TIOCM_RTS)
100 UART_ENABLE_RTS(uart);
101 else
102 UART_DISABLE_RTS(uart);
103 }
104
105 /*
106 * Handle any change of modem status signal.
107 */
bfin_serial_mctrl_cts_int(int irq,void * dev_id)108 static irqreturn_t bfin_serial_mctrl_cts_int(int irq, void *dev_id)
109 {
110 struct bfin_serial_port *uart = dev_id;
111 struct uart_port *uport = &uart->port;
112 unsigned int status = bfin_serial_get_mctrl(uport);
113 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
114
115 UART_CLEAR_SCTS(uart);
116 if (uport->hw_stopped) {
117 if (status) {
118 uport->hw_stopped = 0;
119 uart_write_wakeup(uport);
120 }
121 } else {
122 if (!status)
123 uport->hw_stopped = 1;
124 }
125 #else
126 uart_handle_cts_change(uport, status & TIOCM_CTS);
127 #endif
128
129 return IRQ_HANDLED;
130 }
131 #else
bfin_serial_get_mctrl(struct uart_port * port)132 static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
133 {
134 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
135 }
136
bfin_serial_set_mctrl(struct uart_port * port,unsigned int mctrl)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 */
bfin_serial_stop_tx(struct uart_port * port)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 #if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
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 */
bfin_serial_start_tx(struct uart_port * port)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 /*
179 * To avoid losting RX interrupt, we reset IR function
180 * before sending data.
181 */
182 if (tty->termios.c_line == N_IRDA)
183 bfin_serial_reset_irda(port);
184
185 #ifdef CONFIG_SERIAL_BFIN_DMA
186 if (uart->tx_done)
187 bfin_serial_dma_tx_chars(uart);
188 #else
189 UART_SET_IER(uart, ETBEI);
190 bfin_serial_tx_chars(uart);
191 #endif
192 }
193
194 /*
195 * Interrupts are enabled
196 */
bfin_serial_stop_rx(struct uart_port * port)197 static void bfin_serial_stop_rx(struct uart_port *port)
198 {
199 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
200
201 UART_CLEAR_IER(uart, ERBFI);
202 }
203
204 #if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
205 # define UART_GET_ANOMALY_THRESHOLD(uart) ((uart)->anomaly_threshold)
206 # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
207 #else
208 # define UART_GET_ANOMALY_THRESHOLD(uart) 0
209 # define UART_SET_ANOMALY_THRESHOLD(uart, v)
210 #endif
211
212 #ifdef CONFIG_SERIAL_BFIN_PIO
bfin_serial_rx_chars(struct bfin_serial_port * uart)213 static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
214 {
215 unsigned int status, ch, flg;
216 static struct timeval anomaly_start = { .tv_sec = 0 };
217
218 status = UART_GET_LSR(uart);
219 UART_CLEAR_LSR(uart);
220
221 ch = UART_GET_CHAR(uart);
222 uart->port.icount.rx++;
223
224 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
225 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
226 if (kgdb_connected && kgdboc_port_line == uart->port.line
227 && kgdboc_break_enabled)
228 if (ch == 0x3) {/* Ctrl + C */
229 kgdb_breakpoint();
230 return;
231 }
232
233 if (!uart->port.state)
234 return;
235 #endif
236 if (ANOMALY_05000363) {
237 /* The BF533 (and BF561) family of processors have a nice anomaly
238 * where they continuously generate characters for a "single" break.
239 * We have to basically ignore this flood until the "next" valid
240 * character comes across. Due to the nature of the flood, it is
241 * not possible to reliably catch bytes that are sent too quickly
242 * after this break. So application code talking to the Blackfin
243 * which sends a break signal must allow at least 1.5 character
244 * times after the end of the break for things to stabilize. This
245 * timeout was picked as it must absolutely be larger than 1
246 * character time +/- some percent. So 1.5 sounds good. All other
247 * Blackfin families operate properly. Woo.
248 */
249 if (anomaly_start.tv_sec) {
250 struct timeval curr;
251 suseconds_t usecs;
252
253 if ((~ch & (~ch + 1)) & 0xff)
254 goto known_good_char;
255
256 do_gettimeofday(&curr);
257 if (curr.tv_sec - anomaly_start.tv_sec > 1)
258 goto known_good_char;
259
260 usecs = 0;
261 if (curr.tv_sec != anomaly_start.tv_sec)
262 usecs += USEC_PER_SEC;
263 usecs += curr.tv_usec - anomaly_start.tv_usec;
264
265 if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
266 goto known_good_char;
267
268 if (ch)
269 anomaly_start.tv_sec = 0;
270 else
271 anomaly_start = curr;
272
273 return;
274
275 known_good_char:
276 status &= ~BI;
277 anomaly_start.tv_sec = 0;
278 }
279 }
280
281 if (status & BI) {
282 if (ANOMALY_05000363)
283 if (bfin_revid() < 5)
284 do_gettimeofday(&anomaly_start);
285 uart->port.icount.brk++;
286 if (uart_handle_break(&uart->port))
287 goto ignore_char;
288 status &= ~(PE | FE);
289 }
290 if (status & PE)
291 uart->port.icount.parity++;
292 if (status & OE)
293 uart->port.icount.overrun++;
294 if (status & FE)
295 uart->port.icount.frame++;
296
297 status &= uart->port.read_status_mask;
298
299 if (status & BI)
300 flg = TTY_BREAK;
301 else if (status & PE)
302 flg = TTY_PARITY;
303 else if (status & FE)
304 flg = TTY_FRAME;
305 else
306 flg = TTY_NORMAL;
307
308 if (uart_handle_sysrq_char(&uart->port, ch))
309 goto ignore_char;
310
311 uart_insert_char(&uart->port, status, OE, ch, flg);
312
313 ignore_char:
314 tty_flip_buffer_push(&uart->port.state->port);
315 }
316
bfin_serial_tx_chars(struct bfin_serial_port * uart)317 static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
318 {
319 struct circ_buf *xmit = &uart->port.state->xmit;
320
321 if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
322 #if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
323 /* Clear TFI bit */
324 UART_PUT_LSR(uart, TFI);
325 #endif
326 /* Anomaly notes:
327 * 05000215 - we always clear ETBEI within last UART TX
328 * interrupt to end a string. It is always set
329 * when start a new tx.
330 */
331 UART_CLEAR_IER(uart, ETBEI);
332 return;
333 }
334
335 if (uart->port.x_char) {
336 UART_PUT_CHAR(uart, uart->port.x_char);
337 uart->port.icount.tx++;
338 uart->port.x_char = 0;
339 }
340
341 while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
342 UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
343 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
344 uart->port.icount.tx++;
345 }
346
347 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
348 uart_write_wakeup(&uart->port);
349 }
350
bfin_serial_rx_int(int irq,void * dev_id)351 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
352 {
353 struct bfin_serial_port *uart = dev_id;
354
355 while (UART_GET_LSR(uart) & DR)
356 bfin_serial_rx_chars(uart);
357
358 return IRQ_HANDLED;
359 }
360
bfin_serial_tx_int(int irq,void * dev_id)361 static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
362 {
363 struct bfin_serial_port *uart = dev_id;
364
365 spin_lock(&uart->port.lock);
366 if (UART_GET_LSR(uart) & THRE)
367 bfin_serial_tx_chars(uart);
368 spin_unlock(&uart->port.lock);
369
370 return IRQ_HANDLED;
371 }
372 #endif
373
374 #ifdef CONFIG_SERIAL_BFIN_DMA
bfin_serial_dma_tx_chars(struct bfin_serial_port * uart)375 static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
376 {
377 struct circ_buf *xmit = &uart->port.state->xmit;
378
379 uart->tx_done = 0;
380
381 if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
382 uart->tx_count = 0;
383 uart->tx_done = 1;
384 return;
385 }
386
387 if (uart->port.x_char) {
388 UART_PUT_CHAR(uart, uart->port.x_char);
389 uart->port.icount.tx++;
390 uart->port.x_char = 0;
391 }
392
393 uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
394 if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
395 uart->tx_count = UART_XMIT_SIZE - xmit->tail;
396 blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
397 (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
398 set_dma_config(uart->tx_dma_channel,
399 set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
400 INTR_ON_BUF,
401 DIMENSION_LINEAR,
402 DATA_SIZE_8,
403 DMA_SYNC_RESTART));
404 set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
405 set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
406 set_dma_x_modify(uart->tx_dma_channel, 1);
407 SSYNC();
408 enable_dma(uart->tx_dma_channel);
409
410 UART_SET_IER(uart, ETBEI);
411 }
412
bfin_serial_dma_rx_chars(struct bfin_serial_port * uart)413 static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
414 {
415 int i, flg, status;
416
417 status = UART_GET_LSR(uart);
418 UART_CLEAR_LSR(uart);
419
420 uart->port.icount.rx +=
421 CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
422 UART_XMIT_SIZE);
423
424 if (status & BI) {
425 uart->port.icount.brk++;
426 if (uart_handle_break(&uart->port))
427 goto dma_ignore_char;
428 status &= ~(PE | FE);
429 }
430 if (status & PE)
431 uart->port.icount.parity++;
432 if (status & OE)
433 uart->port.icount.overrun++;
434 if (status & FE)
435 uart->port.icount.frame++;
436
437 status &= uart->port.read_status_mask;
438
439 if (status & BI)
440 flg = TTY_BREAK;
441 else if (status & PE)
442 flg = TTY_PARITY;
443 else if (status & FE)
444 flg = TTY_FRAME;
445 else
446 flg = TTY_NORMAL;
447
448 for (i = uart->rx_dma_buf.tail; ; i++) {
449 if (i >= UART_XMIT_SIZE)
450 i = 0;
451 if (i == uart->rx_dma_buf.head)
452 break;
453 if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
454 uart_insert_char(&uart->port, status, OE,
455 uart->rx_dma_buf.buf[i], flg);
456 }
457
458 dma_ignore_char:
459 tty_flip_buffer_push(&uart->port.state->port);
460 }
461
bfin_serial_rx_dma_timeout(struct bfin_serial_port * uart)462 void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
463 {
464 int x_pos, pos;
465 unsigned long flags;
466
467 dma_disable_irq_nosync(uart->rx_dma_channel);
468 spin_lock_irqsave(&uart->rx_lock, flags);
469
470 /* 2D DMA RX buffer ring is used. Because curr_y_count and
471 * curr_x_count can't be read as an atomic operation,
472 * curr_y_count should be read before curr_x_count. When
473 * curr_x_count is read, curr_y_count may already indicate
474 * next buffer line. But, the position calculated here is
475 * still indicate the old line. The wrong position data may
476 * be smaller than current buffer tail, which cause garbages
477 * are received if it is not prohibit.
478 */
479 uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
480 x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
481 uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
482 if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
483 uart->rx_dma_nrows = 0;
484 x_pos = DMA_RX_XCOUNT - x_pos;
485 if (x_pos == DMA_RX_XCOUNT)
486 x_pos = 0;
487
488 pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
489 /* Ignore receiving data if new position is in the same line of
490 * current buffer tail and small.
491 */
492 if (pos > uart->rx_dma_buf.tail ||
493 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
494 uart->rx_dma_buf.head = pos;
495 bfin_serial_dma_rx_chars(uart);
496 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
497 }
498
499 spin_unlock_irqrestore(&uart->rx_lock, flags);
500 dma_enable_irq(uart->rx_dma_channel);
501
502 mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
503 }
504
bfin_serial_dma_tx_int(int irq,void * dev_id)505 static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
506 {
507 struct bfin_serial_port *uart = dev_id;
508 struct circ_buf *xmit = &uart->port.state->xmit;
509
510 spin_lock(&uart->port.lock);
511 if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
512 disable_dma(uart->tx_dma_channel);
513 clear_dma_irqstat(uart->tx_dma_channel);
514 /* Anomaly notes:
515 * 05000215 - we always clear ETBEI within last UART TX
516 * interrupt to end a string. It is always set
517 * when start a new tx.
518 */
519 UART_CLEAR_IER(uart, ETBEI);
520 uart->port.icount.tx += uart->tx_count;
521 if (!(xmit->tail == 0 && xmit->head == 0)) {
522 xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
523
524 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
525 uart_write_wakeup(&uart->port);
526 }
527
528 bfin_serial_dma_tx_chars(uart);
529 }
530
531 spin_unlock(&uart->port.lock);
532 return IRQ_HANDLED;
533 }
534
bfin_serial_dma_rx_int(int irq,void * dev_id)535 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
536 {
537 struct bfin_serial_port *uart = dev_id;
538 unsigned int irqstat;
539 int x_pos, pos;
540
541 spin_lock(&uart->rx_lock);
542 irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
543 clear_dma_irqstat(uart->rx_dma_channel);
544
545 uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
546 x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
547 uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
548 if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
549 uart->rx_dma_nrows = 0;
550
551 pos = uart->rx_dma_nrows * DMA_RX_XCOUNT;
552 if (pos > uart->rx_dma_buf.tail ||
553 uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
554 uart->rx_dma_buf.head = pos;
555 bfin_serial_dma_rx_chars(uart);
556 uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
557 }
558
559 spin_unlock(&uart->rx_lock);
560
561 return IRQ_HANDLED;
562 }
563 #endif
564
565 /*
566 * Return TIOCSER_TEMT when transmitter is not busy.
567 */
bfin_serial_tx_empty(struct uart_port * port)568 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
569 {
570 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
571 unsigned int lsr;
572
573 lsr = UART_GET_LSR(uart);
574 if (lsr & TEMT)
575 return TIOCSER_TEMT;
576 else
577 return 0;
578 }
579
bfin_serial_break_ctl(struct uart_port * port,int break_state)580 static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
581 {
582 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
583 u32 lcr = UART_GET_LCR(uart);
584 if (break_state)
585 lcr |= SB;
586 else
587 lcr &= ~SB;
588 UART_PUT_LCR(uart, lcr);
589 SSYNC();
590 }
591
bfin_serial_startup(struct uart_port * port)592 static int bfin_serial_startup(struct uart_port *port)
593 {
594 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
595
596 #ifdef CONFIG_SERIAL_BFIN_DMA
597 dma_addr_t dma_handle;
598
599 if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
600 printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
601 return -EBUSY;
602 }
603
604 if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
605 printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
606 free_dma(uart->rx_dma_channel);
607 return -EBUSY;
608 }
609
610 set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
611 set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
612
613 uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
614 uart->rx_dma_buf.head = 0;
615 uart->rx_dma_buf.tail = 0;
616 uart->rx_dma_nrows = 0;
617
618 set_dma_config(uart->rx_dma_channel,
619 set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
620 INTR_ON_ROW, DIMENSION_2D,
621 DATA_SIZE_8,
622 DMA_SYNC_RESTART));
623 set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
624 set_dma_x_modify(uart->rx_dma_channel, 1);
625 set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
626 set_dma_y_modify(uart->rx_dma_channel, 1);
627 set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
628 enable_dma(uart->rx_dma_channel);
629
630 uart->rx_dma_timer.data = (unsigned long)(uart);
631 uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
632 uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
633 add_timer(&(uart->rx_dma_timer));
634 #else
635 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
636 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
637 if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
638 kgdboc_break_enabled = 0;
639 else {
640 # endif
641 if (request_irq(uart->rx_irq, bfin_serial_rx_int, 0,
642 "BFIN_UART_RX", uart)) {
643 printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
644 return -EBUSY;
645 }
646
647 if (request_irq
648 (uart->tx_irq, bfin_serial_tx_int, 0,
649 "BFIN_UART_TX", uart)) {
650 printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
651 free_irq(uart->rx_irq, uart);
652 return -EBUSY;
653 }
654
655 # ifdef CONFIG_BF54x
656 {
657 /*
658 * UART2 and UART3 on BF548 share interrupt PINs and DMA
659 * controllers with SPORT2 and SPORT3. UART rx and tx
660 * interrupts are generated in PIO mode only when configure
661 * their peripheral mapping registers properly, which means
662 * request corresponding DMA channels in PIO mode as well.
663 */
664 unsigned uart_dma_ch_rx, uart_dma_ch_tx;
665
666 switch (uart->rx_irq) {
667 case IRQ_UART3_RX:
668 uart_dma_ch_rx = CH_UART3_RX;
669 uart_dma_ch_tx = CH_UART3_TX;
670 break;
671 case IRQ_UART2_RX:
672 uart_dma_ch_rx = CH_UART2_RX;
673 uart_dma_ch_tx = CH_UART2_TX;
674 break;
675 default:
676 uart_dma_ch_rx = uart_dma_ch_tx = 0;
677 break;
678 }
679
680 if (uart_dma_ch_rx &&
681 request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
682 printk(KERN_NOTICE"Fail to attach UART interrupt\n");
683 free_irq(uart->rx_irq, uart);
684 free_irq(uart->tx_irq, uart);
685 return -EBUSY;
686 }
687 if (uart_dma_ch_tx &&
688 request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
689 printk(KERN_NOTICE "Fail to attach UART interrupt\n");
690 free_dma(uart_dma_ch_rx);
691 free_irq(uart->rx_irq, uart);
692 free_irq(uart->tx_irq, uart);
693 return -EBUSY;
694 }
695 }
696 # endif
697 # if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
698 defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
699 }
700 # endif
701 #endif
702
703 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
704 if (uart->cts_pin >= 0) {
705 if (request_irq(gpio_to_irq(uart->cts_pin),
706 bfin_serial_mctrl_cts_int,
707 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
708 0, "BFIN_UART_CTS", uart)) {
709 uart->cts_pin = -1;
710 pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n");
711 }
712 }
713 if (uart->rts_pin >= 0) {
714 if (gpio_request(uart->rts_pin, DRIVER_NAME)) {
715 pr_info("fail to request RTS PIN at GPIO_%d\n", uart->rts_pin);
716 uart->rts_pin = -1;
717 } else
718 gpio_direction_output(uart->rts_pin, 0);
719 }
720 #endif
721 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
722 if (uart->cts_pin >= 0) {
723 if (request_irq(uart->status_irq, bfin_serial_mctrl_cts_int,
724 0, "BFIN_UART_MODEM_STATUS", uart)) {
725 uart->cts_pin = -1;
726 dev_info(port->dev, "Unable to attach BlackFin UART Modem Status interrupt.\n");
727 }
728
729 /* CTS RTS PINs are negative assertive. */
730 UART_PUT_MCR(uart, UART_GET_MCR(uart) | ACTS);
731 UART_SET_IER(uart, EDSSI);
732 }
733 #endif
734
735 UART_SET_IER(uart, ERBFI);
736 return 0;
737 }
738
bfin_serial_shutdown(struct uart_port * port)739 static void bfin_serial_shutdown(struct uart_port *port)
740 {
741 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
742
743 #ifdef CONFIG_SERIAL_BFIN_DMA
744 disable_dma(uart->tx_dma_channel);
745 free_dma(uart->tx_dma_channel);
746 disable_dma(uart->rx_dma_channel);
747 free_dma(uart->rx_dma_channel);
748 del_timer(&(uart->rx_dma_timer));
749 dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
750 #else
751 #ifdef CONFIG_BF54x
752 switch (uart->port.irq) {
753 case IRQ_UART3_RX:
754 free_dma(CH_UART3_RX);
755 free_dma(CH_UART3_TX);
756 break;
757 case IRQ_UART2_RX:
758 free_dma(CH_UART2_RX);
759 free_dma(CH_UART2_TX);
760 break;
761 default:
762 break;
763 }
764 #endif
765 free_irq(uart->rx_irq, uart);
766 free_irq(uart->tx_irq, uart);
767 #endif
768
769 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
770 if (uart->cts_pin >= 0)
771 free_irq(gpio_to_irq(uart->cts_pin), uart);
772 if (uart->rts_pin >= 0)
773 gpio_free(uart->rts_pin);
774 #endif
775 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
776 if (uart->cts_pin >= 0)
777 free_irq(uart->status_irq, uart);
778 #endif
779 }
780
781 static void
bfin_serial_set_termios(struct uart_port * port,struct ktermios * termios,struct ktermios * old)782 bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
783 struct ktermios *old)
784 {
785 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
786 unsigned long flags;
787 unsigned int baud, quot;
788 unsigned int ier, lcr = 0;
789 unsigned long timeout;
790
791 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
792 if (old == NULL && uart->cts_pin != -1)
793 termios->c_cflag |= CRTSCTS;
794 else if (uart->cts_pin == -1)
795 termios->c_cflag &= ~CRTSCTS;
796 #endif
797
798 switch (termios->c_cflag & CSIZE) {
799 case CS8:
800 lcr = WLS(8);
801 break;
802 case CS7:
803 lcr = WLS(7);
804 break;
805 case CS6:
806 lcr = WLS(6);
807 break;
808 case CS5:
809 lcr = WLS(5);
810 break;
811 default:
812 printk(KERN_ERR "%s: word length not supported\n",
813 __func__);
814 }
815
816 /* Anomaly notes:
817 * 05000231 - STOP bit is always set to 1 whatever the user is set.
818 */
819 if (termios->c_cflag & CSTOPB) {
820 if (ANOMALY_05000231)
821 printk(KERN_WARNING "STOP bits other than 1 is not "
822 "supported in case of anomaly 05000231.\n");
823 else
824 lcr |= STB;
825 }
826 if (termios->c_cflag & PARENB)
827 lcr |= PEN;
828 if (!(termios->c_cflag & PARODD))
829 lcr |= EPS;
830 if (termios->c_cflag & CMSPAR)
831 lcr |= STP;
832
833 spin_lock_irqsave(&uart->port.lock, flags);
834
835 port->read_status_mask = OE;
836 if (termios->c_iflag & INPCK)
837 port->read_status_mask |= (FE | PE);
838 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
839 port->read_status_mask |= BI;
840
841 /*
842 * Characters to ignore
843 */
844 port->ignore_status_mask = 0;
845 if (termios->c_iflag & IGNPAR)
846 port->ignore_status_mask |= FE | PE;
847 if (termios->c_iflag & IGNBRK) {
848 port->ignore_status_mask |= BI;
849 /*
850 * If we're ignoring parity and break indicators,
851 * ignore overruns too (for real raw support).
852 */
853 if (termios->c_iflag & IGNPAR)
854 port->ignore_status_mask |= OE;
855 }
856
857 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
858 quot = uart_get_divisor(port, baud);
859
860 /* If discipline is not IRDA, apply ANOMALY_05000230 */
861 if (termios->c_line != N_IRDA)
862 quot -= ANOMALY_05000230;
863
864 UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
865
866 /* Wait till the transfer buffer is empty */
867 timeout = jiffies + msecs_to_jiffies(10);
868 while (UART_GET_GCTL(uart) & UCEN && !(UART_GET_LSR(uart) & TEMT))
869 if (time_after(jiffies, timeout)) {
870 dev_warn(port->dev, "timeout waiting for TX buffer empty\n");
871 break;
872 }
873
874 /* Disable UART */
875 ier = UART_GET_IER(uart);
876 UART_PUT_GCTL(uart, UART_GET_GCTL(uart) & ~UCEN);
877 UART_DISABLE_INTS(uart);
878
879 /* Set DLAB in LCR to Access CLK */
880 UART_SET_DLAB(uart);
881
882 UART_PUT_CLK(uart, quot);
883 SSYNC();
884
885 /* Clear DLAB in LCR to Access THR RBR IER */
886 UART_CLEAR_DLAB(uart);
887
888 UART_PUT_LCR(uart, (UART_GET_LCR(uart) & ~LCR_MASK) | lcr);
889
890 /* Enable UART */
891 UART_ENABLE_INTS(uart, ier);
892 UART_PUT_GCTL(uart, UART_GET_GCTL(uart) | UCEN);
893
894 /* Port speed changed, update the per-port timeout. */
895 uart_update_timeout(port, termios->c_cflag, baud);
896
897 spin_unlock_irqrestore(&uart->port.lock, flags);
898 }
899
bfin_serial_type(struct uart_port * port)900 static const char *bfin_serial_type(struct uart_port *port)
901 {
902 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
903
904 return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
905 }
906
907 /*
908 * Release the memory region(s) being used by 'port'.
909 */
bfin_serial_release_port(struct uart_port * port)910 static void bfin_serial_release_port(struct uart_port *port)
911 {
912 }
913
914 /*
915 * Request the memory region(s) being used by 'port'.
916 */
bfin_serial_request_port(struct uart_port * port)917 static int bfin_serial_request_port(struct uart_port *port)
918 {
919 return 0;
920 }
921
922 /*
923 * Configure/autoconfigure the port.
924 */
bfin_serial_config_port(struct uart_port * port,int flags)925 static void bfin_serial_config_port(struct uart_port *port, int flags)
926 {
927 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
928
929 if (flags & UART_CONFIG_TYPE &&
930 bfin_serial_request_port(&uart->port) == 0)
931 uart->port.type = PORT_BFIN;
932 }
933
934 /*
935 * Verify the new serial_struct (for TIOCSSERIAL).
936 * The only change we allow are to the flags and type, and
937 * even then only between PORT_BFIN and PORT_UNKNOWN
938 */
939 static int
bfin_serial_verify_port(struct uart_port * port,struct serial_struct * ser)940 bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
941 {
942 return 0;
943 }
944
945 /*
946 * Enable the IrDA function if tty->ldisc.num is N_IRDA.
947 * In other cases, disable IrDA function.
948 */
bfin_serial_set_ldisc(struct uart_port * port,struct ktermios * termios)949 static void bfin_serial_set_ldisc(struct uart_port *port,
950 struct ktermios *termios)
951 {
952 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
953 unsigned int val;
954
955 switch (termios->c_line) {
956 case N_IRDA:
957 val = UART_GET_GCTL(uart);
958 val |= (UMOD_IRDA | RPOLC);
959 UART_PUT_GCTL(uart, val);
960 break;
961 default:
962 val = UART_GET_GCTL(uart);
963 val &= ~(UMOD_MASK | RPOLC);
964 UART_PUT_GCTL(uart, val);
965 }
966 }
967
bfin_serial_reset_irda(struct uart_port * port)968 static void bfin_serial_reset_irda(struct uart_port *port)
969 {
970 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
971 unsigned int val;
972
973 val = UART_GET_GCTL(uart);
974 val &= ~(UMOD_MASK | RPOLC);
975 UART_PUT_GCTL(uart, val);
976 SSYNC();
977 val |= (UMOD_IRDA | RPOLC);
978 UART_PUT_GCTL(uart, val);
979 SSYNC();
980 }
981
982 #ifdef CONFIG_CONSOLE_POLL
983 /* Anomaly notes:
984 * 05000099 - Because we only use THRE in poll_put and DR in poll_get,
985 * losing other bits of UART_LSR is not a problem here.
986 */
bfin_serial_poll_put_char(struct uart_port * port,unsigned char chr)987 static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
988 {
989 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
990
991 while (!(UART_GET_LSR(uart) & THRE))
992 cpu_relax();
993
994 UART_CLEAR_DLAB(uart);
995 UART_PUT_CHAR(uart, (unsigned char)chr);
996 }
997
bfin_serial_poll_get_char(struct uart_port * port)998 static int bfin_serial_poll_get_char(struct uart_port *port)
999 {
1000 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1001 unsigned char chr;
1002
1003 while (!(UART_GET_LSR(uart) & DR))
1004 cpu_relax();
1005
1006 UART_CLEAR_DLAB(uart);
1007 chr = UART_GET_CHAR(uart);
1008
1009 return chr;
1010 }
1011 #endif
1012
1013 static struct uart_ops bfin_serial_pops = {
1014 .tx_empty = bfin_serial_tx_empty,
1015 .set_mctrl = bfin_serial_set_mctrl,
1016 .get_mctrl = bfin_serial_get_mctrl,
1017 .stop_tx = bfin_serial_stop_tx,
1018 .start_tx = bfin_serial_start_tx,
1019 .stop_rx = bfin_serial_stop_rx,
1020 .break_ctl = bfin_serial_break_ctl,
1021 .startup = bfin_serial_startup,
1022 .shutdown = bfin_serial_shutdown,
1023 .set_termios = bfin_serial_set_termios,
1024 .set_ldisc = bfin_serial_set_ldisc,
1025 .type = bfin_serial_type,
1026 .release_port = bfin_serial_release_port,
1027 .request_port = bfin_serial_request_port,
1028 .config_port = bfin_serial_config_port,
1029 .verify_port = bfin_serial_verify_port,
1030 #ifdef CONFIG_CONSOLE_POLL
1031 .poll_put_char = bfin_serial_poll_put_char,
1032 .poll_get_char = bfin_serial_poll_get_char,
1033 #endif
1034 };
1035
1036 #if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
1037 /*
1038 * If the port was already initialised (eg, by a boot loader),
1039 * try to determine the current setup.
1040 */
1041 static void __init
bfin_serial_console_get_options(struct bfin_serial_port * uart,int * baud,int * parity,int * bits)1042 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
1043 int *parity, int *bits)
1044 {
1045 unsigned int status;
1046
1047 status = UART_GET_IER(uart) & (ERBFI | ETBEI);
1048 if (status == (ERBFI | ETBEI)) {
1049 /* ok, the port was enabled */
1050 u32 lcr, clk;
1051
1052 lcr = UART_GET_LCR(uart);
1053
1054 *parity = 'n';
1055 if (lcr & PEN) {
1056 if (lcr & EPS)
1057 *parity = 'e';
1058 else
1059 *parity = 'o';
1060 }
1061 *bits = ((lcr & WLS_MASK) >> WLS_OFFSET) + 5;
1062
1063 /* Set DLAB in LCR to Access CLK */
1064 UART_SET_DLAB(uart);
1065
1066 clk = UART_GET_CLK(uart);
1067
1068 /* Clear DLAB in LCR to Access THR RBR IER */
1069 UART_CLEAR_DLAB(uart);
1070
1071 *baud = get_sclk() / (16*clk);
1072 }
1073 pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
1074 }
1075
1076 static struct uart_driver bfin_serial_reg;
1077
bfin_serial_console_putchar(struct uart_port * port,int ch)1078 static void bfin_serial_console_putchar(struct uart_port *port, int ch)
1079 {
1080 struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
1081 while (!(UART_GET_LSR(uart) & THRE))
1082 barrier();
1083 UART_PUT_CHAR(uart, ch);
1084 }
1085
1086 #endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
1087 defined (CONFIG_EARLY_PRINTK) */
1088
1089 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1090 #define CLASS_BFIN_CONSOLE "bfin-console"
1091 /*
1092 * Interrupts are disabled on entering
1093 */
1094 static void
bfin_serial_console_write(struct console * co,const char * s,unsigned int count)1095 bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
1096 {
1097 struct bfin_serial_port *uart = bfin_serial_ports[co->index];
1098 unsigned long flags;
1099
1100 spin_lock_irqsave(&uart->port.lock, flags);
1101 uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
1102 spin_unlock_irqrestore(&uart->port.lock, flags);
1103
1104 }
1105
1106 static int __init
bfin_serial_console_setup(struct console * co,char * options)1107 bfin_serial_console_setup(struct console *co, char *options)
1108 {
1109 struct bfin_serial_port *uart;
1110 int baud = 57600;
1111 int bits = 8;
1112 int parity = 'n';
1113 # if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1114 defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1115 int flow = 'r';
1116 # else
1117 int flow = 'n';
1118 # endif
1119
1120 /*
1121 * Check whether an invalid uart number has been specified, and
1122 * if so, search for the first available port that does have
1123 * console support.
1124 */
1125 if (co->index < 0 || co->index >= BFIN_UART_NR_PORTS)
1126 return -ENODEV;
1127
1128 uart = bfin_serial_ports[co->index];
1129 if (!uart)
1130 return -ENODEV;
1131
1132 if (options)
1133 uart_parse_options(options, &baud, &parity, &bits, &flow);
1134 else
1135 bfin_serial_console_get_options(uart, &baud, &parity, &bits);
1136
1137 return uart_set_options(&uart->port, co, baud, parity, bits, flow);
1138 }
1139
1140 static struct console bfin_serial_console = {
1141 .name = BFIN_SERIAL_DEV_NAME,
1142 .write = bfin_serial_console_write,
1143 .device = uart_console_device,
1144 .setup = bfin_serial_console_setup,
1145 .flags = CON_PRINTBUFFER,
1146 .index = -1,
1147 .data = &bfin_serial_reg,
1148 };
1149 #define BFIN_SERIAL_CONSOLE (&bfin_serial_console)
1150 #else
1151 #define BFIN_SERIAL_CONSOLE NULL
1152 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
1153
1154 #ifdef CONFIG_EARLY_PRINTK
1155 static struct bfin_serial_port bfin_earlyprintk_port;
1156 #define CLASS_BFIN_EARLYPRINTK "bfin-earlyprintk"
1157
1158 /*
1159 * Interrupts are disabled on entering
1160 */
1161 static void
bfin_earlyprintk_console_write(struct console * co,const char * s,unsigned int count)1162 bfin_earlyprintk_console_write(struct console *co, const char *s, unsigned int count)
1163 {
1164 unsigned long flags;
1165
1166 if (bfin_earlyprintk_port.port.line != co->index)
1167 return;
1168
1169 spin_lock_irqsave(&bfin_earlyprintk_port.port.lock, flags);
1170 uart_console_write(&bfin_earlyprintk_port.port, s, count,
1171 bfin_serial_console_putchar);
1172 spin_unlock_irqrestore(&bfin_earlyprintk_port.port.lock, flags);
1173 }
1174
1175 /*
1176 * This should have a .setup or .early_setup in it, but then things get called
1177 * without the command line options, and the baud rate gets messed up - so
1178 * don't let the common infrastructure play with things. (see calls to setup
1179 * & earlysetup in ./kernel/printk.c:register_console()
1180 */
1181 static struct console bfin_early_serial_console __initdata = {
1182 .name = "early_BFuart",
1183 .write = bfin_earlyprintk_console_write,
1184 .device = uart_console_device,
1185 .flags = CON_PRINTBUFFER,
1186 .index = -1,
1187 .data = &bfin_serial_reg,
1188 };
1189 #endif
1190
1191 static struct uart_driver bfin_serial_reg = {
1192 .owner = THIS_MODULE,
1193 .driver_name = DRIVER_NAME,
1194 .dev_name = BFIN_SERIAL_DEV_NAME,
1195 .major = BFIN_SERIAL_MAJOR,
1196 .minor = BFIN_SERIAL_MINOR,
1197 .nr = BFIN_UART_NR_PORTS,
1198 .cons = BFIN_SERIAL_CONSOLE,
1199 };
1200
bfin_serial_suspend(struct platform_device * pdev,pm_message_t state)1201 static int bfin_serial_suspend(struct platform_device *pdev, pm_message_t state)
1202 {
1203 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1204
1205 return uart_suspend_port(&bfin_serial_reg, &uart->port);
1206 }
1207
bfin_serial_resume(struct platform_device * pdev)1208 static int bfin_serial_resume(struct platform_device *pdev)
1209 {
1210 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1211
1212 return uart_resume_port(&bfin_serial_reg, &uart->port);
1213 }
1214
bfin_serial_probe(struct platform_device * pdev)1215 static int bfin_serial_probe(struct platform_device *pdev)
1216 {
1217 struct resource *res;
1218 struct bfin_serial_port *uart = NULL;
1219 int ret = 0;
1220
1221 if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1222 dev_err(&pdev->dev, "Wrong bfin uart platform device id.\n");
1223 return -ENOENT;
1224 }
1225
1226 if (bfin_serial_ports[pdev->id] == NULL) {
1227
1228 uart = kzalloc(sizeof(*uart), GFP_KERNEL);
1229 if (!uart) {
1230 dev_err(&pdev->dev,
1231 "fail to malloc bfin_serial_port\n");
1232 return -ENOMEM;
1233 }
1234 bfin_serial_ports[pdev->id] = uart;
1235
1236 #ifdef CONFIG_EARLY_PRINTK
1237 if (!(bfin_earlyprintk_port.port.membase
1238 && bfin_earlyprintk_port.port.line == pdev->id)) {
1239 /*
1240 * If the peripheral PINs of current port is allocated
1241 * in earlyprintk probe stage, don't do it again.
1242 */
1243 #endif
1244 ret = peripheral_request_list(
1245 dev_get_platdata(&pdev->dev),
1246 DRIVER_NAME);
1247 if (ret) {
1248 dev_err(&pdev->dev,
1249 "fail to request bfin serial peripherals\n");
1250 goto out_error_free_mem;
1251 }
1252 #ifdef CONFIG_EARLY_PRINTK
1253 }
1254 #endif
1255
1256 spin_lock_init(&uart->port.lock);
1257 uart->port.uartclk = get_sclk();
1258 uart->port.fifosize = BFIN_UART_TX_FIFO_SIZE;
1259 uart->port.ops = &bfin_serial_pops;
1260 uart->port.line = pdev->id;
1261 uart->port.iotype = UPIO_MEM;
1262 uart->port.flags = UPF_BOOT_AUTOCONF;
1263
1264 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1265 if (res == NULL) {
1266 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1267 ret = -ENOENT;
1268 goto out_error_free_peripherals;
1269 }
1270
1271 uart->port.membase = ioremap(res->start, resource_size(res));
1272 if (!uart->port.membase) {
1273 dev_err(&pdev->dev, "Cannot map uart IO\n");
1274 ret = -ENXIO;
1275 goto out_error_free_peripherals;
1276 }
1277 uart->port.mapbase = res->start;
1278
1279 uart->tx_irq = platform_get_irq(pdev, 0);
1280 if (uart->tx_irq < 0) {
1281 dev_err(&pdev->dev, "No uart TX IRQ specified\n");
1282 ret = -ENOENT;
1283 goto out_error_unmap;
1284 }
1285
1286 uart->rx_irq = platform_get_irq(pdev, 1);
1287 if (uart->rx_irq < 0) {
1288 dev_err(&pdev->dev, "No uart RX IRQ specified\n");
1289 ret = -ENOENT;
1290 goto out_error_unmap;
1291 }
1292 uart->port.irq = uart->rx_irq;
1293
1294 uart->status_irq = platform_get_irq(pdev, 2);
1295 if (uart->status_irq < 0) {
1296 dev_err(&pdev->dev, "No uart status IRQ specified\n");
1297 ret = -ENOENT;
1298 goto out_error_unmap;
1299 }
1300
1301 #ifdef CONFIG_SERIAL_BFIN_DMA
1302 spin_lock_init(&uart->rx_lock);
1303 uart->tx_done = 1;
1304 uart->tx_count = 0;
1305
1306 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1307 if (res == NULL) {
1308 dev_err(&pdev->dev, "No uart TX DMA channel specified\n");
1309 ret = -ENOENT;
1310 goto out_error_unmap;
1311 }
1312 uart->tx_dma_channel = res->start;
1313
1314 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1315 if (res == NULL) {
1316 dev_err(&pdev->dev, "No uart RX DMA channel specified\n");
1317 ret = -ENOENT;
1318 goto out_error_unmap;
1319 }
1320 uart->rx_dma_channel = res->start;
1321
1322 init_timer(&(uart->rx_dma_timer));
1323 #endif
1324
1325 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
1326 defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
1327 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
1328 if (res == NULL)
1329 uart->cts_pin = -1;
1330 else
1331 uart->cts_pin = res->start;
1332
1333 res = platform_get_resource(pdev, IORESOURCE_IO, 1);
1334 if (res == NULL)
1335 uart->rts_pin = -1;
1336 else
1337 uart->rts_pin = res->start;
1338 #endif
1339 }
1340
1341 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1342 if (!is_early_platform_device(pdev)) {
1343 #endif
1344 uart = bfin_serial_ports[pdev->id];
1345 uart->port.dev = &pdev->dev;
1346 dev_set_drvdata(&pdev->dev, uart);
1347 ret = uart_add_one_port(&bfin_serial_reg, &uart->port);
1348 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1349 }
1350 #endif
1351
1352 if (!ret)
1353 return 0;
1354
1355 if (uart) {
1356 out_error_unmap:
1357 iounmap(uart->port.membase);
1358 out_error_free_peripherals:
1359 peripheral_free_list(dev_get_platdata(&pdev->dev));
1360 out_error_free_mem:
1361 kfree(uart);
1362 bfin_serial_ports[pdev->id] = NULL;
1363 }
1364
1365 return ret;
1366 }
1367
bfin_serial_remove(struct platform_device * pdev)1368 static int bfin_serial_remove(struct platform_device *pdev)
1369 {
1370 struct bfin_serial_port *uart = platform_get_drvdata(pdev);
1371
1372 dev_set_drvdata(&pdev->dev, NULL);
1373
1374 if (uart) {
1375 uart_remove_one_port(&bfin_serial_reg, &uart->port);
1376 iounmap(uart->port.membase);
1377 peripheral_free_list(dev_get_platdata(&pdev->dev));
1378 kfree(uart);
1379 bfin_serial_ports[pdev->id] = NULL;
1380 }
1381
1382 return 0;
1383 }
1384
1385 static struct platform_driver bfin_serial_driver = {
1386 .probe = bfin_serial_probe,
1387 .remove = bfin_serial_remove,
1388 .suspend = bfin_serial_suspend,
1389 .resume = bfin_serial_resume,
1390 .driver = {
1391 .name = DRIVER_NAME,
1392 },
1393 };
1394
1395 #if defined(CONFIG_SERIAL_BFIN_CONSOLE)
1396 static struct early_platform_driver early_bfin_serial_driver __initdata = {
1397 .class_str = CLASS_BFIN_CONSOLE,
1398 .pdrv = &bfin_serial_driver,
1399 .requested_id = EARLY_PLATFORM_ID_UNSET,
1400 };
1401
bfin_serial_rs_console_init(void)1402 static int __init bfin_serial_rs_console_init(void)
1403 {
1404 early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME);
1405
1406 early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0);
1407
1408 register_console(&bfin_serial_console);
1409
1410 return 0;
1411 }
1412 console_initcall(bfin_serial_rs_console_init);
1413 #endif
1414
1415 #ifdef CONFIG_EARLY_PRINTK
1416 /*
1417 * Memory can't be allocated dynamically during earlyprink init stage.
1418 * So, do individual probe for earlyprink with a static uart port variable.
1419 */
bfin_earlyprintk_probe(struct platform_device * pdev)1420 static int bfin_earlyprintk_probe(struct platform_device *pdev)
1421 {
1422 struct resource *res;
1423 int ret;
1424
1425 if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
1426 dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n");
1427 return -ENOENT;
1428 }
1429
1430 ret = peripheral_request_list(dev_get_platdata(&pdev->dev),
1431 DRIVER_NAME);
1432 if (ret) {
1433 dev_err(&pdev->dev,
1434 "fail to request bfin serial peripherals\n");
1435 return ret;
1436 }
1437
1438 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1439 if (res == NULL) {
1440 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
1441 ret = -ENOENT;
1442 goto out_error_free_peripherals;
1443 }
1444
1445 bfin_earlyprintk_port.port.membase = ioremap(res->start,
1446 resource_size(res));
1447 if (!bfin_earlyprintk_port.port.membase) {
1448 dev_err(&pdev->dev, "Cannot map uart IO\n");
1449 ret = -ENXIO;
1450 goto out_error_free_peripherals;
1451 }
1452 bfin_earlyprintk_port.port.mapbase = res->start;
1453 bfin_earlyprintk_port.port.line = pdev->id;
1454 bfin_earlyprintk_port.port.uartclk = get_sclk();
1455 bfin_earlyprintk_port.port.fifosize = BFIN_UART_TX_FIFO_SIZE;
1456 spin_lock_init(&bfin_earlyprintk_port.port.lock);
1457
1458 return 0;
1459
1460 out_error_free_peripherals:
1461 peripheral_free_list(dev_get_platdata(&pdev->dev));
1462
1463 return ret;
1464 }
1465
1466 static struct platform_driver bfin_earlyprintk_driver = {
1467 .probe = bfin_earlyprintk_probe,
1468 .driver = {
1469 .name = DRIVER_NAME,
1470 .owner = THIS_MODULE,
1471 },
1472 };
1473
1474 static struct early_platform_driver early_bfin_earlyprintk_driver __initdata = {
1475 .class_str = CLASS_BFIN_EARLYPRINTK,
1476 .pdrv = &bfin_earlyprintk_driver,
1477 .requested_id = EARLY_PLATFORM_ID_UNSET,
1478 };
1479
bfin_earlyserial_init(unsigned int port,unsigned int cflag)1480 struct console __init *bfin_earlyserial_init(unsigned int port,
1481 unsigned int cflag)
1482 {
1483 struct ktermios t;
1484 char port_name[20];
1485
1486 if (port < 0 || port >= BFIN_UART_NR_PORTS)
1487 return NULL;
1488
1489 /*
1490 * Only probe resource of the given port in earlyprintk boot arg.
1491 * The expected port id should be indicated in port name string.
1492 */
1493 snprintf(port_name, 20, DRIVER_NAME ".%d", port);
1494 early_platform_driver_register(&early_bfin_earlyprintk_driver,
1495 port_name);
1496 early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0);
1497
1498 if (!bfin_earlyprintk_port.port.membase)
1499 return NULL;
1500
1501 #ifdef CONFIG_SERIAL_BFIN_CONSOLE
1502 /*
1503 * If we are using early serial, don't let the normal console rewind
1504 * log buffer, since that causes things to be printed multiple times
1505 */
1506 bfin_serial_console.flags &= ~CON_PRINTBUFFER;
1507 #endif
1508
1509 bfin_early_serial_console.index = port;
1510 t.c_cflag = cflag;
1511 t.c_iflag = 0;
1512 t.c_oflag = 0;
1513 t.c_lflag = ICANON;
1514 t.c_line = port;
1515 bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t);
1516
1517 return &bfin_early_serial_console;
1518 }
1519 #endif /* CONFIG_EARLY_PRINTK */
1520
bfin_serial_init(void)1521 static int __init bfin_serial_init(void)
1522 {
1523 int ret;
1524
1525 pr_info("Blackfin serial driver\n");
1526
1527 ret = uart_register_driver(&bfin_serial_reg);
1528 if (ret) {
1529 pr_err("failed to register %s:%d\n",
1530 bfin_serial_reg.driver_name, ret);
1531 }
1532
1533 ret = platform_driver_register(&bfin_serial_driver);
1534 if (ret) {
1535 pr_err("fail to register bfin uart\n");
1536 uart_unregister_driver(&bfin_serial_reg);
1537 }
1538
1539 return ret;
1540 }
1541
bfin_serial_exit(void)1542 static void __exit bfin_serial_exit(void)
1543 {
1544 platform_driver_unregister(&bfin_serial_driver);
1545 uart_unregister_driver(&bfin_serial_reg);
1546 }
1547
1548
1549 module_init(bfin_serial_init);
1550 module_exit(bfin_serial_exit);
1551
1552 MODULE_AUTHOR("Sonic Zhang, Aubrey Li");
1553 MODULE_DESCRIPTION("Blackfin generic serial port driver");
1554 MODULE_LICENSE("GPL");
1555 MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
1556 MODULE_ALIAS("platform:bfin-uart");
1557