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rt2x00: Remove incorrect led blink
[linux-2.6.git] / drivers / tty / serial / bfin_sport_uart.c
blob891d194ae754e95e43de55b494b8848e236a9040
1 /*
2 * Blackfin On-Chip Sport Emulated UART Driver
3 *
4 * Copyright 2006-2009 Analog Devices Inc.
5 *
6 * Enter bugs at http://blackfin.uclinux.org/
7 *
8 * Licensed under the GPL-2 or later.
9 */
10
11 /*
12 * This driver and the hardware supported are in term of EE-191 of ADI.
13 * http://www.analog.com/static/imported-files/application_notes/EE191.pdf
14 * This application note describe how to implement a UART on a Sharc DSP,
15 * but this driver is implemented on Blackfin Processor.
16 * Transmit Frame Sync is not used by this driver to transfer data out.
17 */
18
19 /* #define DEBUG */
20
21 #define DRV_NAME "bfin-sport-uart"
22 #define DEVICE_NAME "ttySS"
23 #define pr_fmt(fmt) DRV_NAME ": " fmt
24
25 #include <linux/module.h>
26 #include <linux/ioport.h>
27 #include <linux/io.h>
28 #include <linux/init.h>
29 #include <linux/console.h>
30 #include <linux/sysrq.h>
31 #include <linux/slab.h>
32 #include <linux/platform_device.h>
33 #include <linux/tty.h>
34 #include <linux/tty_flip.h>
35 #include <linux/serial_core.h>
36
37 #include <asm/bfin_sport.h>
38 #include <asm/delay.h>
39 #include <asm/portmux.h>
40
41 #include "bfin_sport_uart.h"
42
43 struct sport_uart_port {
44 struct uart_port port;
45 int err_irq;
46 unsigned short csize;
47 unsigned short rxmask;
48 unsigned short txmask1;
49 unsigned short txmask2;
50 unsigned char stopb;
51 /* unsigned char parib; */
52 #ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
53 int cts_pin;
54 int rts_pin;
55 #endif
56 };
57
58 static int sport_uart_tx_chars(struct sport_uart_port *up);
59 static void sport_stop_tx(struct uart_port *port);
60
61 static inline void tx_one_byte(struct sport_uart_port *up, unsigned int value)
62 {
63 pr_debug("%s value:%x, mask1=0x%x, mask2=0x%x\n", __func__, value,
64 up->txmask1, up->txmask2);
65
66 /* Place Start and Stop bits */
67 __asm__ __volatile__ (
68 "%[val] <<= 1;"
69 "%[val] = %[val] & %[mask1];"
70 "%[val] = %[val] | %[mask2];"
71 : [val]"+d"(value)
72 : [mask1]"d"(up->txmask1), [mask2]"d"(up->txmask2)
73 : "ASTAT"
74 );
75 pr_debug("%s value:%x\n", __func__, value);
76
77 SPORT_PUT_TX(up, value);
78 }
79
80 static inline unsigned char rx_one_byte(struct sport_uart_port *up)
81 {
82 unsigned int value;
83 unsigned char extract;
84 u32 tmp_mask1, tmp_mask2, tmp_shift, tmp;
85
86 if ((up->csize + up->stopb) > 7)
87 value = SPORT_GET_RX32(up);
88 else
89 value = SPORT_GET_RX(up);
90
91 pr_debug("%s value:%x, cs=%d, mask=0x%x\n", __func__, value,
92 up->csize, up->rxmask);
93
94 /* Extract data */
95 __asm__ __volatile__ (
96 "%[extr] = 0;"
97 "%[mask1] = %[rxmask];"
98 "%[mask2] = 0x0200(Z);"
99 "%[shift] = 0;"
100 "LSETUP(.Lloop_s, .Lloop_e) LC0 = %[lc];"
101 ".Lloop_s:"
102 "%[tmp] = extract(%[val], %[mask1].L)(Z);"
103 "%[tmp] <<= %[shift];"
104 "%[extr] = %[extr] | %[tmp];"
105 "%[mask1] = %[mask1] - %[mask2];"
106 ".Lloop_e:"
107 "%[shift] += 1;"
108 : [extr]"=&d"(extract), [shift]"=&d"(tmp_shift), [tmp]"=&d"(tmp),
109 [mask1]"=&d"(tmp_mask1), [mask2]"=&d"(tmp_mask2)
110 : [val]"d"(value), [rxmask]"d"(up->rxmask), [lc]"a"(up->csize)
111 : "ASTAT", "LB0", "LC0", "LT0"
112 );
113
114 pr_debug(" extract:%x\n", extract);
115 return extract;
116 }
117
118 static int sport_uart_setup(struct sport_uart_port *up, int size, int baud_rate)
119 {
120 int tclkdiv, rclkdiv;
121 unsigned int sclk = get_sclk();
122
123 /* Set TCR1 and TCR2, TFSR is not enabled for uart */
124 SPORT_PUT_TCR1(up, (LATFS | ITFS | TFSR | TLSBIT | ITCLK));
125 SPORT_PUT_TCR2(up, size + 1);
126 pr_debug("%s TCR1:%x, TCR2:%x\n", __func__, SPORT_GET_TCR1(up), SPORT_GET_TCR2(up));
127
128 /* Set RCR1 and RCR2 */
129 SPORT_PUT_RCR1(up, (RCKFE | LARFS | LRFS | RFSR | IRCLK));
130 SPORT_PUT_RCR2(up, (size + 1) * 2 - 1);
131 pr_debug("%s RCR1:%x, RCR2:%x\n", __func__, SPORT_GET_RCR1(up), SPORT_GET_RCR2(up));
132
133 tclkdiv = sclk / (2 * baud_rate) - 1;
134 /* The actual uart baud rate of devices vary between +/-2%. The sport
135 * RX sample rate should be faster than the double of the worst case,
136 * otherwise, wrong data are received. So, set sport RX clock to be
137 * 3% faster.
138 */
139 rclkdiv = sclk / (2 * baud_rate * 2 * 97 / 100) - 1;
140 SPORT_PUT_TCLKDIV(up, tclkdiv);
141 SPORT_PUT_RCLKDIV(up, rclkdiv);
142 SSYNC();
143 pr_debug("%s sclk:%d, baud_rate:%d, tclkdiv:%d, rclkdiv:%d\n",
144 __func__, sclk, baud_rate, tclkdiv, rclkdiv);
145
146 return 0;
147 }
148
149 static irqreturn_t sport_uart_rx_irq(int irq, void *dev_id)
150 {
151 struct sport_uart_port *up = dev_id;
152 struct tty_struct *tty = up->port.state->port.tty;
153 unsigned int ch;
154
155 spin_lock(&up->port.lock);
156
157 while (SPORT_GET_STAT(up) & RXNE) {
158 ch = rx_one_byte(up);
159 up->port.icount.rx++;
160
161 if (!uart_handle_sysrq_char(&up->port, ch))
162 tty_insert_flip_char(tty, ch, TTY_NORMAL);
163 }
164 tty_flip_buffer_push(tty);
165
166 spin_unlock(&up->port.lock);
167
168 return IRQ_HANDLED;
169 }
170
171 static irqreturn_t sport_uart_tx_irq(int irq, void *dev_id)
172 {
173 struct sport_uart_port *up = dev_id;
174
175 spin_lock(&up->port.lock);
176 sport_uart_tx_chars(up);
177 spin_unlock(&up->port.lock);
178
179 return IRQ_HANDLED;
180 }
181
182 static irqreturn_t sport_uart_err_irq(int irq, void *dev_id)
183 {
184 struct sport_uart_port *up = dev_id;
185 struct tty_struct *tty = up->port.state->port.tty;
186 unsigned int stat = SPORT_GET_STAT(up);
187
188 spin_lock(&up->port.lock);
189
190 /* Overflow in RX FIFO */
191 if (stat & ROVF) {
192 up->port.icount.overrun++;
193 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
194 SPORT_PUT_STAT(up, ROVF); /* Clear ROVF bit */
195 }
196 /* These should not happen */
197 if (stat & (TOVF | TUVF | RUVF)) {
198 pr_err("SPORT Error:%s %s %s\n",
199 (stat & TOVF) ? "TX overflow" : "",
200 (stat & TUVF) ? "TX underflow" : "",
201 (stat & RUVF) ? "RX underflow" : "");
202 SPORT_PUT_TCR1(up, SPORT_GET_TCR1(up) & ~TSPEN);
203 SPORT_PUT_RCR1(up, SPORT_GET_RCR1(up) & ~RSPEN);
204 }
205 SSYNC();
206
207 spin_unlock(&up->port.lock);
208 return IRQ_HANDLED;
209 }
210
211 #ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
212 static unsigned int sport_get_mctrl(struct uart_port *port)
213 {
214 struct sport_uart_port *up = (struct sport_uart_port *)port;
215 if (up->cts_pin < 0)
216 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
217
218 /* CTS PIN is negative assertive. */
219 if (SPORT_UART_GET_CTS(up))
220 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
221 else
222 return TIOCM_DSR | TIOCM_CAR;
223 }
224
225 static void sport_set_mctrl(struct uart_port *port, unsigned int mctrl)
226 {
227 struct sport_uart_port *up = (struct sport_uart_port *)port;
228 if (up->rts_pin < 0)
229 return;
230
231 /* RTS PIN is negative assertive. */
232 if (mctrl & TIOCM_RTS)
233 SPORT_UART_ENABLE_RTS(up);
234 else
235 SPORT_UART_DISABLE_RTS(up);
236 }
237
238 /*
239 * Handle any change of modem status signal.
240 */
241 static irqreturn_t sport_mctrl_cts_int(int irq, void *dev_id)
242 {
243 struct sport_uart_port *up = (struct sport_uart_port *)dev_id;
244 unsigned int status;
245
246 status = sport_get_mctrl(&up->port);
247 uart_handle_cts_change(&up->port, status & TIOCM_CTS);
248
249 return IRQ_HANDLED;
250 }
251 #else
252 static unsigned int sport_get_mctrl(struct uart_port *port)
253 {
254 pr_debug("%s enter\n", __func__);
255 return TIOCM_CTS | TIOCM_CD | TIOCM_DSR;
256 }
257
258 static void sport_set_mctrl(struct uart_port *port, unsigned int mctrl)
259 {
260 pr_debug("%s enter\n", __func__);
261 }
262 #endif
263
264 /* Reqeust IRQ, Setup clock */
265 static int sport_startup(struct uart_port *port)
266 {
267 struct sport_uart_port *up = (struct sport_uart_port *)port;
268 int ret;
269
270 pr_debug("%s enter\n", __func__);
271 ret = request_irq(up->port.irq, sport_uart_rx_irq, 0,
272 "SPORT_UART_RX", up);
273 if (ret) {
274 dev_err(port->dev, "unable to request SPORT RX interrupt\n");
275 return ret;
276 }
277
278 ret = request_irq(up->port.irq+1, sport_uart_tx_irq, 0,
279 "SPORT_UART_TX", up);
280 if (ret) {
281 dev_err(port->dev, "unable to request SPORT TX interrupt\n");
282 goto fail1;
283 }
284
285 ret = request_irq(up->err_irq, sport_uart_err_irq, 0,
286 "SPORT_UART_STATUS", up);
287 if (ret) {
288 dev_err(port->dev, "unable to request SPORT status interrupt\n");
289 goto fail2;
290 }
291
292 #ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
293 if (up->cts_pin >= 0) {
294 if (request_irq(gpio_to_irq(up->cts_pin),
295 sport_mctrl_cts_int,
296 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
297 IRQF_DISABLED, "BFIN_SPORT_UART_CTS", up)) {
298 up->cts_pin = -1;
299 dev_info(port->dev, "Unable to attach BlackFin UART over SPORT CTS interrupt. So, disable it.\n");
300 }
301 }
302 if (up->rts_pin >= 0)
303 gpio_direction_output(up->rts_pin, 0);
304 #endif
305
306 return 0;
307 fail2:
308 free_irq(up->port.irq+1, up);
309 fail1:
310 free_irq(up->port.irq, up);
311
312 return ret;
313 }
314
315 /*
316 * sport_uart_tx_chars
317 *
318 * ret 1 means need to enable sport.
319 * ret 0 means do nothing.
320 */
321 static int sport_uart_tx_chars(struct sport_uart_port *up)
322 {
323 struct circ_buf *xmit = &up->port.state->xmit;
324
325 if (SPORT_GET_STAT(up) & TXF)
326 return 0;
327
328 if (up->port.x_char) {
329 tx_one_byte(up, up->port.x_char);
330 up->port.icount.tx++;
331 up->port.x_char = 0;
332 return 1;
333 }
334
335 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
336 /* The waiting loop to stop SPORT TX from TX interrupt is
337 * too long. This may block SPORT RX interrupts and cause
338 * RX FIFO overflow. So, do stop sport TX only after the last
339 * char in TX FIFO is moved into the shift register.
340 */
341 if (SPORT_GET_STAT(up) & TXHRE)
342 sport_stop_tx(&up->port);
343 return 0;
344 }
345
346 while(!(SPORT_GET_STAT(up) & TXF) && !uart_circ_empty(xmit)) {
347 tx_one_byte(up, xmit->buf[xmit->tail]);
348 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE -1);
349 up->port.icount.tx++;
350 }
351
352 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
353 uart_write_wakeup(&up->port);
354
355 return 1;
356 }
357
358 static unsigned int sport_tx_empty(struct uart_port *port)
359 {
360 struct sport_uart_port *up = (struct sport_uart_port *)port;
361 unsigned int stat;
362
363 stat = SPORT_GET_STAT(up);
364 pr_debug("%s stat:%04x\n", __func__, stat);
365 if (stat & TXHRE) {
366 return TIOCSER_TEMT;
367 } else
368 return 0;
369 }
370
371 static void sport_stop_tx(struct uart_port *port)
372 {
373 struct sport_uart_port *up = (struct sport_uart_port *)port;
374
375 pr_debug("%s enter\n", __func__);
376
377 if (!(SPORT_GET_TCR1(up) & TSPEN))
378 return;
379
380 /* Although the hold register is empty, last byte is still in shift
381 * register and not sent out yet. So, put a dummy data into TX FIFO.
382 * Then, sport tx stops when last byte is shift out and the dummy
383 * data is moved into the shift register.
384 */
385 SPORT_PUT_TX(up, 0xffff);
386 while (!(SPORT_GET_STAT(up) & TXHRE))
387 cpu_relax();
388
389 SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) & ~TSPEN));
390 SSYNC();
391
392 return;
393 }
394
395 static void sport_start_tx(struct uart_port *port)
396 {
397 struct sport_uart_port *up = (struct sport_uart_port *)port;
398
399 pr_debug("%s enter\n", __func__);
400
401 /* Write data into SPORT FIFO before enable SPROT to transmit */
402 if (sport_uart_tx_chars(up)) {
403 /* Enable transmit, then an interrupt will generated */
404 SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) | TSPEN));
405 SSYNC();
406 }
407
408 pr_debug("%s exit\n", __func__);
409 }
410
411 static void sport_stop_rx(struct uart_port *port)
412 {
413 struct sport_uart_port *up = (struct sport_uart_port *)port;
414
415 pr_debug("%s enter\n", __func__);
416 /* Disable sport to stop rx */
417 SPORT_PUT_RCR1(up, (SPORT_GET_RCR1(up) & ~RSPEN));
418 SSYNC();
419 }
420
421 static void sport_enable_ms(struct uart_port *port)
422 {
423 pr_debug("%s enter\n", __func__);
424 }
425
426 static void sport_break_ctl(struct uart_port *port, int break_state)
427 {
428 pr_debug("%s enter\n", __func__);
429 }
430
431 static void sport_shutdown(struct uart_port *port)
432 {
433 struct sport_uart_port *up = (struct sport_uart_port *)port;
434
435 dev_dbg(port->dev, "%s enter\n", __func__);
436
437 /* Disable sport */
438 SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) & ~TSPEN));
439 SPORT_PUT_RCR1(up, (SPORT_GET_RCR1(up) & ~RSPEN));
440 SSYNC();
441
442 free_irq(up->port.irq, up);
443 free_irq(up->port.irq+1, up);
444 free_irq(up->err_irq, up);
445 #ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
446 if (up->cts_pin >= 0)
447 free_irq(gpio_to_irq(up->cts_pin), up);
448 #endif
449 }
450
451 static const char *sport_type(struct uart_port *port)
452 {
453 struct sport_uart_port *up = (struct sport_uart_port *)port;
454
455 pr_debug("%s enter\n", __func__);
456 return up->port.type == PORT_BFIN_SPORT ? "BFIN-SPORT-UART" : NULL;
457 }
458
459 static void sport_release_port(struct uart_port *port)
460 {
461 pr_debug("%s enter\n", __func__);
462 }
463
464 static int sport_request_port(struct uart_port *port)
465 {
466 pr_debug("%s enter\n", __func__);
467 return 0;
468 }
469
470 static void sport_config_port(struct uart_port *port, int flags)
471 {
472 struct sport_uart_port *up = (struct sport_uart_port *)port;
473
474 pr_debug("%s enter\n", __func__);
475 up->port.type = PORT_BFIN_SPORT;
476 }
477
478 static int sport_verify_port(struct uart_port *port, struct serial_struct *ser)
479 {
480 pr_debug("%s enter\n", __func__);
481 return 0;
482 }
483
484 static void sport_set_termios(struct uart_port *port,
485 struct ktermios *termios, struct ktermios *old)
486 {
487 struct sport_uart_port *up = (struct sport_uart_port *)port;
488 unsigned long flags;
489 int i;
490
491 pr_debug("%s enter, c_cflag:%08x\n", __func__, termios->c_cflag);
492
493 switch (termios->c_cflag & CSIZE) {
494 case CS8:
495 up->csize = 8;
496 break;
497 case CS7:
498 up->csize = 7;
499 break;
500 case CS6:
501 up->csize = 6;
502 break;
503 case CS5:
504 up->csize = 5;
505 break;
506 default:
507 pr_warning("requested word length not supported\n");
508 }
509
510 if (termios->c_cflag & CSTOPB) {
511 up->stopb = 1;
512 }
513 if (termios->c_cflag & PARENB) {
514 pr_warning("PAREN bits is not supported yet\n");
515 /* up->parib = 1; */
516 }
517
518 spin_lock_irqsave(&up->port.lock, flags);
519
520 port->read_status_mask = 0;
521
522 /*
523 * Characters to ignore
524 */
525 port->ignore_status_mask = 0;
526
527 /* RX extract mask */
528 up->rxmask = 0x01 | (((up->csize + up->stopb) * 2 - 1) << 0x8);
529 /* TX masks, 8 bit data and 1 bit stop for example:
530 * mask1 = b#0111111110
531 * mask2 = b#1000000000
532 */
533 for (i = 0, up->txmask1 = 0; i < up->csize; i++)
534 up->txmask1 |= (1<<i);
535 up->txmask2 = (1<<i);
536 if (up->stopb) {
537 ++i;
538 up->txmask2 |= (1<<i);
539 }
540 up->txmask1 <<= 1;
541 up->txmask2 <<= 1;
542 /* uart baud rate */
543 port->uartclk = uart_get_baud_rate(port, termios, old, 0, get_sclk()/16);
544
545 /* Disable UART */
546 SPORT_PUT_TCR1(up, SPORT_GET_TCR1(up) & ~TSPEN);
547 SPORT_PUT_RCR1(up, SPORT_GET_RCR1(up) & ~RSPEN);
548
549 sport_uart_setup(up, up->csize + up->stopb, port->uartclk);
550
551 /* driver TX line high after config, one dummy data is
552 * necessary to stop sport after shift one byte
553 */
554 SPORT_PUT_TX(up, 0xffff);
555 SPORT_PUT_TX(up, 0xffff);
556 SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) | TSPEN));
557 SSYNC();
558 while (!(SPORT_GET_STAT(up) & TXHRE))
559 cpu_relax();
560 SPORT_PUT_TCR1(up, SPORT_GET_TCR1(up) & ~TSPEN);
561 SSYNC();
562
563 /* Port speed changed, update the per-port timeout. */
564 uart_update_timeout(port, termios->c_cflag, port->uartclk);
565
566 /* Enable sport rx */
567 SPORT_PUT_RCR1(up, SPORT_GET_RCR1(up) | RSPEN);
568 SSYNC();
569
570 spin_unlock_irqrestore(&up->port.lock, flags);
571 }
572
573 struct uart_ops sport_uart_ops = {
574 .tx_empty = sport_tx_empty,
575 .set_mctrl = sport_set_mctrl,
576 .get_mctrl = sport_get_mctrl,
577 .stop_tx = sport_stop_tx,
578 .start_tx = sport_start_tx,
579 .stop_rx = sport_stop_rx,
580 .enable_ms = sport_enable_ms,
581 .break_ctl = sport_break_ctl,
582 .startup = sport_startup,
583 .shutdown = sport_shutdown,
584 .set_termios = sport_set_termios,
585 .type = sport_type,
586 .release_port = sport_release_port,
587 .request_port = sport_request_port,
588 .config_port = sport_config_port,
589 .verify_port = sport_verify_port,
590 };
591
592 #define BFIN_SPORT_UART_MAX_PORTS 4
593
594 static struct sport_uart_port *bfin_sport_uart_ports[BFIN_SPORT_UART_MAX_PORTS];
595
596 #ifdef CONFIG_SERIAL_BFIN_SPORT_CONSOLE
597 #define CLASS_BFIN_SPORT_CONSOLE "bfin-sport-console"
598
599 static int __init
600 sport_uart_console_setup(struct console *co, char *options)
601 {
602 struct sport_uart_port *up;
603 int baud = 57600;
604 int bits = 8;
605 int parity = 'n';
606 # ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
607 int flow = 'r';
608 # else
609 int flow = 'n';
610 # endif
611
612 /* Check whether an invalid uart number has been specified */
613 if (co->index < 0 || co->index >= BFIN_SPORT_UART_MAX_PORTS)
614 return -ENODEV;
615
616 up = bfin_sport_uart_ports[co->index];
617 if (!up)
618 return -ENODEV;
619
620 if (options)
621 uart_parse_options(options, &baud, &parity, &bits, &flow);
622
623 return uart_set_options(&up->port, co, baud, parity, bits, flow);
624 }
625
626 static void sport_uart_console_putchar(struct uart_port *port, int ch)
627 {
628 struct sport_uart_port *up = (struct sport_uart_port *)port;
629
630 while (SPORT_GET_STAT(up) & TXF)
631 barrier();
632
633 tx_one_byte(up, ch);
634 }
635
636 /*
637 * Interrupts are disabled on entering
638 */
639 static void
640 sport_uart_console_write(struct console *co, const char *s, unsigned int count)
641 {
642 struct sport_uart_port *up = bfin_sport_uart_ports[co->index];
643 unsigned long flags;
644
645 spin_lock_irqsave(&up->port.lock, flags);
646
647 if (SPORT_GET_TCR1(up) & TSPEN)
648 uart_console_write(&up->port, s, count, sport_uart_console_putchar);
649 else {
650 /* dummy data to start sport */
651 while (SPORT_GET_STAT(up) & TXF)
652 barrier();
653 SPORT_PUT_TX(up, 0xffff);
654 /* Enable transmit, then an interrupt will generated */
655 SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) | TSPEN));
656 SSYNC();
657
658 uart_console_write(&up->port, s, count, sport_uart_console_putchar);
659
660 /* Although the hold register is empty, last byte is still in shift
661 * register and not sent out yet. So, put a dummy data into TX FIFO.
662 * Then, sport tx stops when last byte is shift out and the dummy
663 * data is moved into the shift register.
664 */
665 while (SPORT_GET_STAT(up) & TXF)
666 barrier();
667 SPORT_PUT_TX(up, 0xffff);
668 while (!(SPORT_GET_STAT(up) & TXHRE))
669 barrier();
670
671 /* Stop sport tx transfer */
672 SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) & ~TSPEN));
673 SSYNC();
674 }
675
676 spin_unlock_irqrestore(&up->port.lock, flags);
677 }
678
679 static struct uart_driver sport_uart_reg;
680
681 static struct console sport_uart_console = {
682 .name = DEVICE_NAME,
683 .write = sport_uart_console_write,
684 .device = uart_console_device,
685 .setup = sport_uart_console_setup,
686 .flags = CON_PRINTBUFFER,
687 .index = -1,
688 .data = &sport_uart_reg,
689 };
690
691 #define SPORT_UART_CONSOLE (&sport_uart_console)
692 #else
693 #define SPORT_UART_CONSOLE NULL
694 #endif /* CONFIG_SERIAL_BFIN_SPORT_CONSOLE */
695
696
697 static struct uart_driver sport_uart_reg = {
698 .owner = THIS_MODULE,
699 .driver_name = DRV_NAME,
700 .dev_name = DEVICE_NAME,
701 .major = 204,
702 .minor = 84,
703 .nr = BFIN_SPORT_UART_MAX_PORTS,
704 .cons = SPORT_UART_CONSOLE,
705 };
706
707 #ifdef CONFIG_PM
708 static int sport_uart_suspend(struct device *dev)
709 {
710 struct sport_uart_port *sport = dev_get_drvdata(dev);
711
712 dev_dbg(dev, "%s enter\n", __func__);
713 if (sport)
714 uart_suspend_port(&sport_uart_reg, &sport->port);
715
716 return 0;
717 }
718
719 static int sport_uart_resume(struct device *dev)
720 {
721 struct sport_uart_port *sport = dev_get_drvdata(dev);
722
723 dev_dbg(dev, "%s enter\n", __func__);
724 if (sport)
725 uart_resume_port(&sport_uart_reg, &sport->port);
726
727 return 0;
728 }
729
730 static struct dev_pm_ops bfin_sport_uart_dev_pm_ops = {
731 .suspend = sport_uart_suspend,
732 .resume = sport_uart_resume,
733 };
734 #endif
735
736 static int __devinit sport_uart_probe(struct platform_device *pdev)
737 {
738 struct resource *res;
739 struct sport_uart_port *sport;
740 int ret = 0;
741
742 dev_dbg(&pdev->dev, "%s enter\n", __func__);
743
744 if (pdev->id < 0 || pdev->id >= BFIN_SPORT_UART_MAX_PORTS) {
745 dev_err(&pdev->dev, "Wrong sport uart platform device id.\n");
746 return -ENOENT;
747 }
748
749 if (bfin_sport_uart_ports[pdev->id] == NULL) {
750 bfin_sport_uart_ports[pdev->id] =
751 kzalloc(sizeof(struct sport_uart_port), GFP_KERNEL);
752 sport = bfin_sport_uart_ports[pdev->id];
753 if (!sport) {
754 dev_err(&pdev->dev,
755 "Fail to malloc sport_uart_port\n");
756 return -ENOMEM;
757 }
758
759 ret = peripheral_request_list(
760 (unsigned short *)pdev->dev.platform_data, DRV_NAME);
761 if (ret) {
762 dev_err(&pdev->dev,
763 "Fail to request SPORT peripherals\n");
764 goto out_error_free_mem;
765 }
766
767 spin_lock_init(&sport->port.lock);
768 sport->port.fifosize = SPORT_TX_FIFO_SIZE,
769 sport->port.ops = &sport_uart_ops;
770 sport->port.line = pdev->id;
771 sport->port.iotype = UPIO_MEM;
772 sport->port.flags = UPF_BOOT_AUTOCONF;
773
774 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
775 if (res == NULL) {
776 dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
777 ret = -ENOENT;
778 goto out_error_free_peripherals;
779 }
780
781 sport->port.membase = ioremap(res->start, resource_size(res));
782 if (!sport->port.membase) {
783 dev_err(&pdev->dev, "Cannot map sport IO\n");
784 ret = -ENXIO;
785 goto out_error_free_peripherals;
786 }
787 sport->port.mapbase = res->start;
788
789 sport->port.irq = platform_get_irq(pdev, 0);
790 if ((int)sport->port.irq < 0) {
791 dev_err(&pdev->dev, "No sport RX/TX IRQ specified\n");
792 ret = -ENOENT;
793 goto out_error_unmap;
794 }
795
796 sport->err_irq = platform_get_irq(pdev, 1);
797 if (sport->err_irq < 0) {
798 dev_err(&pdev->dev, "No sport status IRQ specified\n");
799 ret = -ENOENT;
800 goto out_error_unmap;
801 }
802 #ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
803 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
804 if (res == NULL)
805 sport->cts_pin = -1;
806 else
807 sport->cts_pin = res->start;
808
809 res = platform_get_resource(pdev, IORESOURCE_IO, 1);
810 if (res == NULL)
811 sport->rts_pin = -1;
812 else
813 sport->rts_pin = res->start;
814
815 if (sport->rts_pin >= 0)
816 gpio_request(sport->rts_pin, DRV_NAME);
817 #endif
818 }
819
820 #ifdef CONFIG_SERIAL_BFIN_SPORT_CONSOLE
821 if (!is_early_platform_device(pdev)) {
822 #endif
823 sport = bfin_sport_uart_ports[pdev->id];
824 sport->port.dev = &pdev->dev;
825 dev_set_drvdata(&pdev->dev, sport);
826 ret = uart_add_one_port(&sport_uart_reg, &sport->port);
827 #ifdef CONFIG_SERIAL_BFIN_SPORT_CONSOLE
828 }
829 #endif
830 if (!ret)
831 return 0;
832
833 if (sport) {
834 out_error_unmap:
835 iounmap(sport->port.membase);
836 out_error_free_peripherals:
837 peripheral_free_list(
838 (unsigned short *)pdev->dev.platform_data);
839 out_error_free_mem:
840 kfree(sport);
841 bfin_sport_uart_ports[pdev->id] = NULL;
842 }
843
844 return ret;
845 }
846
847 static int __devexit sport_uart_remove(struct platform_device *pdev)
848 {
849 struct sport_uart_port *sport = platform_get_drvdata(pdev);
850
851 dev_dbg(&pdev->dev, "%s enter\n", __func__);
852 dev_set_drvdata(&pdev->dev, NULL);
853
854 if (sport) {
855 uart_remove_one_port(&sport_uart_reg, &sport->port);
856 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
857 if (sport->rts_pin >= 0)
858 gpio_free(sport->rts_pin);
859 #endif
860 iounmap(sport->port.membase);
861 peripheral_free_list(
862 (unsigned short *)pdev->dev.platform_data);
863 kfree(sport);
864 bfin_sport_uart_ports[pdev->id] = NULL;
865 }
866
867 return 0;
868 }
869
870 static struct platform_driver sport_uart_driver = {
871 .probe = sport_uart_probe,
872 .remove = __devexit_p(sport_uart_remove),
873 .driver = {
874 .name = DRV_NAME,
875 #ifdef CONFIG_PM
876 .pm = &bfin_sport_uart_dev_pm_ops,
877 #endif
878 },
879 };
880
881 #ifdef CONFIG_SERIAL_BFIN_SPORT_CONSOLE
882 static __initdata struct early_platform_driver early_sport_uart_driver = {
883 .class_str = CLASS_BFIN_SPORT_CONSOLE,
884 .pdrv = &sport_uart_driver,
885 .requested_id = EARLY_PLATFORM_ID_UNSET,
886 };
887
888 static int __init sport_uart_rs_console_init(void)
889 {
890 early_platform_driver_register(&early_sport_uart_driver, DRV_NAME);
891
892 early_platform_driver_probe(CLASS_BFIN_SPORT_CONSOLE,
893 BFIN_SPORT_UART_MAX_PORTS, 0);
894
895 register_console(&sport_uart_console);
896
897 return 0;
898 }
899 console_initcall(sport_uart_rs_console_init);
900 #endif
901
902 static int __init sport_uart_init(void)
903 {
904 int ret;
905
906 pr_info("Blackfin uart over sport driver\n");
907
908 ret = uart_register_driver(&sport_uart_reg);
909 if (ret) {
910 pr_err("failed to register %s:%d\n",
911 sport_uart_reg.driver_name, ret);
912 return ret;
913 }
914
915 ret = platform_driver_register(&sport_uart_driver);
916 if (ret) {
917 pr_err("failed to register sport uart driver:%d\n", ret);
918 uart_unregister_driver(&sport_uart_reg);
919 }
920
921 return ret;
922 }
923 module_init(sport_uart_init);
924
925 static void __exit sport_uart_exit(void)
926 {
927 platform_driver_unregister(&sport_uart_driver);
928 uart_unregister_driver(&sport_uart_reg);
929 }
930 module_exit(sport_uart_exit);
931
932 MODULE_AUTHOR("Sonic Zhang, Roy Huang");
933 MODULE_DESCRIPTION("Blackfin serial over SPORT driver");
934 MODULE_LICENSE("GPL");
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