]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/tty/serial/pxa.c
projects / mirror_ubuntu-artful-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'doc-4.8-fixes' of git://git.lwn.net/linux
[mirror_ubuntu-artful-kernel.git] / drivers / tty / serial / pxa.c
1 /*
2 * Based on drivers/serial/8250.c by Russell King.
3 *
4 * Author: Nicolas Pitre
5 * Created: Feb 20, 2003
6 * Copyright: (C) 2003 Monta Vista Software, Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * Note 1: This driver is made separate from the already too overloaded
14 * 8250.c because it needs some kirks of its own and that'll make it
15 * easier to add DMA support.
16 *
17 * Note 2: I'm too sick of device allocation policies for serial ports.
18 * If someone else wants to request an "official" allocation of major/minor
19 * for this driver please be my guest. And don't forget that new hardware
20 * to come from Intel might have more than 3 or 4 of those UARTs. Let's
21 * hope for a better port registration and dynamic device allocation scheme
22 * with the serial core maintainer satisfaction to appear soon.
23 */
24
25
26 #if defined(CONFIG_SERIAL_PXA_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
27 #define SUPPORT_SYSRQ
28 #endif
29
30 #include <linux/ioport.h>
31 #include <linux/init.h>
32 #include <linux/console.h>
33 #include <linux/sysrq.h>
34 #include <linux/serial_reg.h>
35 #include <linux/circ_buf.h>
36 #include <linux/delay.h>
37 #include <linux/interrupt.h>
38 #include <linux/of.h>
39 #include <linux/platform_device.h>
40 #include <linux/tty.h>
41 #include <linux/tty_flip.h>
42 #include <linux/serial_core.h>
43 #include <linux/clk.h>
44 #include <linux/io.h>
45 #include <linux/slab.h>
46
47 #define PXA_NAME_LEN 8
48
49 struct uart_pxa_port {
50 struct uart_port port;
51 unsigned char ier;
52 unsigned char lcr;
53 unsigned char mcr;
54 unsigned int lsr_break_flag;
55 struct clk *clk;
56 char name[PXA_NAME_LEN];
57 };
58
59 static inline unsigned int serial_in(struct uart_pxa_port *up, int offset)
60 {
61 offset <<= 2;
62 return readl(up->port.membase + offset);
63 }
64
65 static inline void serial_out(struct uart_pxa_port *up, int offset, int value)
66 {
67 offset <<= 2;
68 writel(value, up->port.membase + offset);
69 }
70
71 static void serial_pxa_enable_ms(struct uart_port *port)
72 {
73 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
74
75 up->ier |= UART_IER_MSI;
76 serial_out(up, UART_IER, up->ier);
77 }
78
79 static void serial_pxa_stop_tx(struct uart_port *port)
80 {
81 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
82
83 if (up->ier & UART_IER_THRI) {
84 up->ier &= ~UART_IER_THRI;
85 serial_out(up, UART_IER, up->ier);
86 }
87 }
88
89 static void serial_pxa_stop_rx(struct uart_port *port)
90 {
91 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
92
93 up->ier &= ~UART_IER_RLSI;
94 up->port.read_status_mask &= ~UART_LSR_DR;
95 serial_out(up, UART_IER, up->ier);
96 }
97
98 static inline void receive_chars(struct uart_pxa_port *up, int *status)
99 {
100 unsigned int ch, flag;
101 int max_count = 256;
102
103 do {
104 /* work around Errata #20 according to
105 * Intel(R) PXA27x Processor Family
106 * Specification Update (May 2005)
107 *
108 * Step 2
109 * Disable the Reciever Time Out Interrupt via IER[RTOEI]
110 */
111 up->ier &= ~UART_IER_RTOIE;
112 serial_out(up, UART_IER, up->ier);
113
114 ch = serial_in(up, UART_RX);
115 flag = TTY_NORMAL;
116 up->port.icount.rx++;
117
118 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
119 UART_LSR_FE | UART_LSR_OE))) {
120 /*
121 * For statistics only
122 */
123 if (*status & UART_LSR_BI) {
124 *status &= ~(UART_LSR_FE | UART_LSR_PE);
125 up->port.icount.brk++;
126 /*
127 * We do the SysRQ and SAK checking
128 * here because otherwise the break
129 * may get masked by ignore_status_mask
130 * or read_status_mask.
131 */
132 if (uart_handle_break(&up->port))
133 goto ignore_char;
134 } else if (*status & UART_LSR_PE)
135 up->port.icount.parity++;
136 else if (*status & UART_LSR_FE)
137 up->port.icount.frame++;
138 if (*status & UART_LSR_OE)
139 up->port.icount.overrun++;
140
141 /*
142 * Mask off conditions which should be ignored.
143 */
144 *status &= up->port.read_status_mask;
145
146 #ifdef CONFIG_SERIAL_PXA_CONSOLE
147 if (up->port.line == up->port.cons->index) {
148 /* Recover the break flag from console xmit */
149 *status |= up->lsr_break_flag;
150 up->lsr_break_flag = 0;
151 }
152 #endif
153 if (*status & UART_LSR_BI) {
154 flag = TTY_BREAK;
155 } else if (*status & UART_LSR_PE)
156 flag = TTY_PARITY;
157 else if (*status & UART_LSR_FE)
158 flag = TTY_FRAME;
159 }
160
161 if (uart_handle_sysrq_char(&up->port, ch))
162 goto ignore_char;
163
164 uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag);
165
166 ignore_char:
167 *status = serial_in(up, UART_LSR);
168 } while ((*status & UART_LSR_DR) && (max_count-- > 0));
169 tty_flip_buffer_push(&up->port.state->port);
170
171 /* work around Errata #20 according to
172 * Intel(R) PXA27x Processor Family
173 * Specification Update (May 2005)
174 *
175 * Step 6:
176 * No more data in FIFO: Re-enable RTO interrupt via IER[RTOIE]
177 */
178 up->ier |= UART_IER_RTOIE;
179 serial_out(up, UART_IER, up->ier);
180 }
181
182 static void transmit_chars(struct uart_pxa_port *up)
183 {
184 struct circ_buf *xmit = &up->port.state->xmit;
185 int count;
186
187 if (up->port.x_char) {
188 serial_out(up, UART_TX, up->port.x_char);
189 up->port.icount.tx++;
190 up->port.x_char = 0;
191 return;
192 }
193 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
194 serial_pxa_stop_tx(&up->port);
195 return;
196 }
197
198 count = up->port.fifosize / 2;
199 do {
200 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
201 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
202 up->port.icount.tx++;
203 if (uart_circ_empty(xmit))
204 break;
205 } while (--count > 0);
206
207 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
208 uart_write_wakeup(&up->port);
209
210
211 if (uart_circ_empty(xmit))
212 serial_pxa_stop_tx(&up->port);
213 }
214
215 static void serial_pxa_start_tx(struct uart_port *port)
216 {
217 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
218
219 if (!(up->ier & UART_IER_THRI)) {
220 up->ier |= UART_IER_THRI;
221 serial_out(up, UART_IER, up->ier);
222 }
223 }
224
225 /* should hold up->port.lock */
226 static inline void check_modem_status(struct uart_pxa_port *up)
227 {
228 int status;
229
230 status = serial_in(up, UART_MSR);
231
232 if ((status & UART_MSR_ANY_DELTA) == 0)
233 return;
234
235 if (status & UART_MSR_TERI)
236 up->port.icount.rng++;
237 if (status & UART_MSR_DDSR)
238 up->port.icount.dsr++;
239 if (status & UART_MSR_DDCD)
240 uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
241 if (status & UART_MSR_DCTS)
242 uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
243
244 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
245 }
246
247 /*
248 * This handles the interrupt from one port.
249 */
250 static inline irqreturn_t serial_pxa_irq(int irq, void *dev_id)
251 {
252 struct uart_pxa_port *up = dev_id;
253 unsigned int iir, lsr;
254
255 iir = serial_in(up, UART_IIR);
256 if (iir & UART_IIR_NO_INT)
257 return IRQ_NONE;
258 spin_lock(&up->port.lock);
259 lsr = serial_in(up, UART_LSR);
260 if (lsr & UART_LSR_DR)
261 receive_chars(up, &lsr);
262 check_modem_status(up);
263 if (lsr & UART_LSR_THRE)
264 transmit_chars(up);
265 spin_unlock(&up->port.lock);
266 return IRQ_HANDLED;
267 }
268
269 static unsigned int serial_pxa_tx_empty(struct uart_port *port)
270 {
271 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
272 unsigned long flags;
273 unsigned int ret;
274
275 spin_lock_irqsave(&up->port.lock, flags);
276 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
277 spin_unlock_irqrestore(&up->port.lock, flags);
278
279 return ret;
280 }
281
282 static unsigned int serial_pxa_get_mctrl(struct uart_port *port)
283 {
284 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
285 unsigned char status;
286 unsigned int ret;
287
288 status = serial_in(up, UART_MSR);
289
290 ret = 0;
291 if (status & UART_MSR_DCD)
292 ret |= TIOCM_CAR;
293 if (status & UART_MSR_RI)
294 ret |= TIOCM_RNG;
295 if (status & UART_MSR_DSR)
296 ret |= TIOCM_DSR;
297 if (status & UART_MSR_CTS)
298 ret |= TIOCM_CTS;
299 return ret;
300 }
301
302 static void serial_pxa_set_mctrl(struct uart_port *port, unsigned int mctrl)
303 {
304 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
305 unsigned char mcr = 0;
306
307 if (mctrl & TIOCM_RTS)
308 mcr |= UART_MCR_RTS;
309 if (mctrl & TIOCM_DTR)
310 mcr |= UART_MCR_DTR;
311 if (mctrl & TIOCM_OUT1)
312 mcr |= UART_MCR_OUT1;
313 if (mctrl & TIOCM_OUT2)
314 mcr |= UART_MCR_OUT2;
315 if (mctrl & TIOCM_LOOP)
316 mcr |= UART_MCR_LOOP;
317
318 mcr |= up->mcr;
319
320 serial_out(up, UART_MCR, mcr);
321 }
322
323 static void serial_pxa_break_ctl(struct uart_port *port, int break_state)
324 {
325 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
326 unsigned long flags;
327
328 spin_lock_irqsave(&up->port.lock, flags);
329 if (break_state == -1)
330 up->lcr |= UART_LCR_SBC;
331 else
332 up->lcr &= ~UART_LCR_SBC;
333 serial_out(up, UART_LCR, up->lcr);
334 spin_unlock_irqrestore(&up->port.lock, flags);
335 }
336
337 static int serial_pxa_startup(struct uart_port *port)
338 {
339 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
340 unsigned long flags;
341 int retval;
342
343 if (port->line == 3) /* HWUART */
344 up->mcr |= UART_MCR_AFE;
345 else
346 up->mcr = 0;
347
348 up->port.uartclk = clk_get_rate(up->clk);
349
350 /*
351 * Allocate the IRQ
352 */
353 retval = request_irq(up->port.irq, serial_pxa_irq, 0, up->name, up);
354 if (retval)
355 return retval;
356
357 /*
358 * Clear the FIFO buffers and disable them.
359 * (they will be reenabled in set_termios())
360 */
361 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
362 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
363 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
364 serial_out(up, UART_FCR, 0);
365
366 /*
367 * Clear the interrupt registers.
368 */
369 (void) serial_in(up, UART_LSR);
370 (void) serial_in(up, UART_RX);
371 (void) serial_in(up, UART_IIR);
372 (void) serial_in(up, UART_MSR);
373
374 /*
375 * Now, initialize the UART
376 */
377 serial_out(up, UART_LCR, UART_LCR_WLEN8);
378
379 spin_lock_irqsave(&up->port.lock, flags);
380 up->port.mctrl |= TIOCM_OUT2;
381 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
382 spin_unlock_irqrestore(&up->port.lock, flags);
383
384 /*
385 * Finally, enable interrupts. Note: Modem status interrupts
386 * are set via set_termios(), which will be occurring imminently
387 * anyway, so we don't enable them here.
388 */
389 up->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE;
390 serial_out(up, UART_IER, up->ier);
391
392 /*
393 * And clear the interrupt registers again for luck.
394 */
395 (void) serial_in(up, UART_LSR);
396 (void) serial_in(up, UART_RX);
397 (void) serial_in(up, UART_IIR);
398 (void) serial_in(up, UART_MSR);
399
400 return 0;
401 }
402
403 static void serial_pxa_shutdown(struct uart_port *port)
404 {
405 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
406 unsigned long flags;
407
408 free_irq(up->port.irq, up);
409
410 /*
411 * Disable interrupts from this port
412 */
413 up->ier = 0;
414 serial_out(up, UART_IER, 0);
415
416 spin_lock_irqsave(&up->port.lock, flags);
417 up->port.mctrl &= ~TIOCM_OUT2;
418 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
419 spin_unlock_irqrestore(&up->port.lock, flags);
420
421 /*
422 * Disable break condition and FIFOs
423 */
424 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
425 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
426 UART_FCR_CLEAR_RCVR |
427 UART_FCR_CLEAR_XMIT);
428 serial_out(up, UART_FCR, 0);
429 }
430
431 static void
432 serial_pxa_set_termios(struct uart_port *port, struct ktermios *termios,
433 struct ktermios *old)
434 {
435 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
436 unsigned char cval, fcr = 0;
437 unsigned long flags;
438 unsigned int baud, quot;
439 unsigned int dll;
440
441 switch (termios->c_cflag & CSIZE) {
442 case CS5:
443 cval = UART_LCR_WLEN5;
444 break;
445 case CS6:
446 cval = UART_LCR_WLEN6;
447 break;
448 case CS7:
449 cval = UART_LCR_WLEN7;
450 break;
451 default:
452 case CS8:
453 cval = UART_LCR_WLEN8;
454 break;
455 }
456
457 if (termios->c_cflag & CSTOPB)
458 cval |= UART_LCR_STOP;
459 if (termios->c_cflag & PARENB)
460 cval |= UART_LCR_PARITY;
461 if (!(termios->c_cflag & PARODD))
462 cval |= UART_LCR_EPAR;
463
464 /*
465 * Ask the core to calculate the divisor for us.
466 */
467 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
468 quot = uart_get_divisor(port, baud);
469
470 if ((up->port.uartclk / quot) < (2400 * 16))
471 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR1;
472 else if ((up->port.uartclk / quot) < (230400 * 16))
473 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR8;
474 else
475 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR32;
476
477 /*
478 * Ok, we're now changing the port state. Do it with
479 * interrupts disabled.
480 */
481 spin_lock_irqsave(&up->port.lock, flags);
482
483 /*
484 * Ensure the port will be enabled.
485 * This is required especially for serial console.
486 */
487 up->ier |= UART_IER_UUE;
488
489 /*
490 * Update the per-port timeout.
491 */
492 uart_update_timeout(port, termios->c_cflag, baud);
493
494 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
495 if (termios->c_iflag & INPCK)
496 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
497 if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
498 up->port.read_status_mask |= UART_LSR_BI;
499
500 /*
501 * Characters to ignore
502 */
503 up->port.ignore_status_mask = 0;
504 if (termios->c_iflag & IGNPAR)
505 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
506 if (termios->c_iflag & IGNBRK) {
507 up->port.ignore_status_mask |= UART_LSR_BI;
508 /*
509 * If we're ignoring parity and break indicators,
510 * ignore overruns too (for real raw support).
511 */
512 if (termios->c_iflag & IGNPAR)
513 up->port.ignore_status_mask |= UART_LSR_OE;
514 }
515
516 /*
517 * ignore all characters if CREAD is not set
518 */
519 if ((termios->c_cflag & CREAD) == 0)
520 up->port.ignore_status_mask |= UART_LSR_DR;
521
522 /*
523 * CTS flow control flag and modem status interrupts
524 */
525 up->ier &= ~UART_IER_MSI;
526 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
527 up->ier |= UART_IER_MSI;
528
529 serial_out(up, UART_IER, up->ier);
530
531 if (termios->c_cflag & CRTSCTS)
532 up->mcr |= UART_MCR_AFE;
533 else
534 up->mcr &= ~UART_MCR_AFE;
535
536 serial_out(up, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */
537 serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */
538
539 /*
540 * work around Errata #75 according to Intel(R) PXA27x Processor Family
541 * Specification Update (Nov 2005)
542 */
543 dll = serial_in(up, UART_DLL);
544 WARN_ON(dll != (quot & 0xff));
545
546 serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */
547 serial_out(up, UART_LCR, cval); /* reset DLAB */
548 up->lcr = cval; /* Save LCR */
549 serial_pxa_set_mctrl(&up->port, up->port.mctrl);
550 serial_out(up, UART_FCR, fcr);
551 spin_unlock_irqrestore(&up->port.lock, flags);
552 }
553
554 static void
555 serial_pxa_pm(struct uart_port *port, unsigned int state,
556 unsigned int oldstate)
557 {
558 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
559
560 if (!state)
561 clk_prepare_enable(up->clk);
562 else
563 clk_disable_unprepare(up->clk);
564 }
565
566 static void serial_pxa_release_port(struct uart_port *port)
567 {
568 }
569
570 static int serial_pxa_request_port(struct uart_port *port)
571 {
572 return 0;
573 }
574
575 static void serial_pxa_config_port(struct uart_port *port, int flags)
576 {
577 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
578 up->port.type = PORT_PXA;
579 }
580
581 static int
582 serial_pxa_verify_port(struct uart_port *port, struct serial_struct *ser)
583 {
584 /* we don't want the core code to modify any port params */
585 return -EINVAL;
586 }
587
588 static const char *
589 serial_pxa_type(struct uart_port *port)
590 {
591 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
592 return up->name;
593 }
594
595 static struct uart_pxa_port *serial_pxa_ports[4];
596 static struct uart_driver serial_pxa_reg;
597
598 #ifdef CONFIG_SERIAL_PXA_CONSOLE
599
600 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
601
602 /*
603 * Wait for transmitter & holding register to empty
604 */
605 static void wait_for_xmitr(struct uart_pxa_port *up)
606 {
607 unsigned int status, tmout = 10000;
608
609 /* Wait up to 10ms for the character(s) to be sent. */
610 do {
611 status = serial_in(up, UART_LSR);
612
613 if (status & UART_LSR_BI)
614 up->lsr_break_flag = UART_LSR_BI;
615
616 if (--tmout == 0)
617 break;
618 udelay(1);
619 } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
620
621 /* Wait up to 1s for flow control if necessary */
622 if (up->port.flags & UPF_CONS_FLOW) {
623 tmout = 1000000;
624 while (--tmout &&
625 ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
626 udelay(1);
627 }
628 }
629
630 static void serial_pxa_console_putchar(struct uart_port *port, int ch)
631 {
632 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
633
634 wait_for_xmitr(up);
635 serial_out(up, UART_TX, ch);
636 }
637
638 /*
639 * Print a string to the serial port trying not to disturb
640 * any possible real use of the port...
641 *
642 * The console_lock must be held when we get here.
643 */
644 static void
645 serial_pxa_console_write(struct console *co, const char *s, unsigned int count)
646 {
647 struct uart_pxa_port *up = serial_pxa_ports[co->index];
648 unsigned int ier;
649 unsigned long flags;
650 int locked = 1;
651
652 clk_enable(up->clk);
653 local_irq_save(flags);
654 if (up->port.sysrq)
655 locked = 0;
656 else if (oops_in_progress)
657 locked = spin_trylock(&up->port.lock);
658 else
659 spin_lock(&up->port.lock);
660
661 /*
662 * First save the IER then disable the interrupts
663 */
664 ier = serial_in(up, UART_IER);
665 serial_out(up, UART_IER, UART_IER_UUE);
666
667 uart_console_write(&up->port, s, count, serial_pxa_console_putchar);
668
669 /*
670 * Finally, wait for transmitter to become empty
671 * and restore the IER
672 */
673 wait_for_xmitr(up);
674 serial_out(up, UART_IER, ier);
675
676 if (locked)
677 spin_unlock(&up->port.lock);
678 local_irq_restore(flags);
679 clk_disable(up->clk);
680
681 }
682
683 #ifdef CONFIG_CONSOLE_POLL
684 /*
685 * Console polling routines for writing and reading from the uart while
686 * in an interrupt or debug context.
687 */
688
689 static int serial_pxa_get_poll_char(struct uart_port *port)
690 {
691 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
692 unsigned char lsr = serial_in(up, UART_LSR);
693
694 while (!(lsr & UART_LSR_DR))
695 lsr = serial_in(up, UART_LSR);
696
697 return serial_in(up, UART_RX);
698 }
699
700
701 static void serial_pxa_put_poll_char(struct uart_port *port,
702 unsigned char c)
703 {
704 unsigned int ier;
705 struct uart_pxa_port *up = (struct uart_pxa_port *)port;
706
707 /*
708 * First save the IER then disable the interrupts
709 */
710 ier = serial_in(up, UART_IER);
711 serial_out(up, UART_IER, UART_IER_UUE);
712
713 wait_for_xmitr(up);
714 /*
715 * Send the character out.
716 */
717 serial_out(up, UART_TX, c);
718
719 /*
720 * Finally, wait for transmitter to become empty
721 * and restore the IER
722 */
723 wait_for_xmitr(up);
724 serial_out(up, UART_IER, ier);
725 }
726
727 #endif /* CONFIG_CONSOLE_POLL */
728
729 static int __init
730 serial_pxa_console_setup(struct console *co, char *options)
731 {
732 struct uart_pxa_port *up;
733 int baud = 9600;
734 int bits = 8;
735 int parity = 'n';
736 int flow = 'n';
737
738 if (co->index == -1 || co->index >= serial_pxa_reg.nr)
739 co->index = 0;
740 up = serial_pxa_ports[co->index];
741 if (!up)
742 return -ENODEV;
743
744 if (options)
745 uart_parse_options(options, &baud, &parity, &bits, &flow);
746
747 return uart_set_options(&up->port, co, baud, parity, bits, flow);
748 }
749
750 static struct console serial_pxa_console = {
751 .name = "ttyS",
752 .write = serial_pxa_console_write,
753 .device = uart_console_device,
754 .setup = serial_pxa_console_setup,
755 .flags = CON_PRINTBUFFER,
756 .index = -1,
757 .data = &serial_pxa_reg,
758 };
759
760 #define PXA_CONSOLE &serial_pxa_console
761 #else
762 #define PXA_CONSOLE NULL
763 #endif
764
765 static struct uart_ops serial_pxa_pops = {
766 .tx_empty = serial_pxa_tx_empty,
767 .set_mctrl = serial_pxa_set_mctrl,
768 .get_mctrl = serial_pxa_get_mctrl,
769 .stop_tx = serial_pxa_stop_tx,
770 .start_tx = serial_pxa_start_tx,
771 .stop_rx = serial_pxa_stop_rx,
772 .enable_ms = serial_pxa_enable_ms,
773 .break_ctl = serial_pxa_break_ctl,
774 .startup = serial_pxa_startup,
775 .shutdown = serial_pxa_shutdown,
776 .set_termios = serial_pxa_set_termios,
777 .pm = serial_pxa_pm,
778 .type = serial_pxa_type,
779 .release_port = serial_pxa_release_port,
780 .request_port = serial_pxa_request_port,
781 .config_port = serial_pxa_config_port,
782 .verify_port = serial_pxa_verify_port,
783 #if defined(CONFIG_CONSOLE_POLL) && defined(CONFIG_SERIAL_PXA_CONSOLE)
784 .poll_get_char = serial_pxa_get_poll_char,
785 .poll_put_char = serial_pxa_put_poll_char,
786 #endif
787 };
788
789 static struct uart_driver serial_pxa_reg = {
790 .owner = THIS_MODULE,
791 .driver_name = "PXA serial",
792 .dev_name = "ttyS",
793 .major = TTY_MAJOR,
794 .minor = 64,
795 .nr = 4,
796 .cons = PXA_CONSOLE,
797 };
798
799 #ifdef CONFIG_PM
800 static int serial_pxa_suspend(struct device *dev)
801 {
802 struct uart_pxa_port *sport = dev_get_drvdata(dev);
803
804 if (sport)
805 uart_suspend_port(&serial_pxa_reg, &sport->port);
806
807 return 0;
808 }
809
810 static int serial_pxa_resume(struct device *dev)
811 {
812 struct uart_pxa_port *sport = dev_get_drvdata(dev);
813
814 if (sport)
815 uart_resume_port(&serial_pxa_reg, &sport->port);
816
817 return 0;
818 }
819
820 static const struct dev_pm_ops serial_pxa_pm_ops = {
821 .suspend = serial_pxa_suspend,
822 .resume = serial_pxa_resume,
823 };
824 #endif
825
826 static const struct of_device_id serial_pxa_dt_ids[] = {
827 { .compatible = "mrvl,pxa-uart", },
828 { .compatible = "mrvl,mmp-uart", },
829 {}
830 };
831
832 static int serial_pxa_probe_dt(struct platform_device *pdev,
833 struct uart_pxa_port *sport)
834 {
835 struct device_node *np = pdev->dev.of_node;
836 int ret;
837
838 if (!np)
839 return 1;
840
841 ret = of_alias_get_id(np, "serial");
842 if (ret < 0) {
843 dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);
844 return ret;
845 }
846 sport->port.line = ret;
847 return 0;
848 }
849
850 static int serial_pxa_probe(struct platform_device *dev)
851 {
852 struct uart_pxa_port *sport;
853 struct resource *mmres, *irqres;
854 int ret;
855
856 mmres = platform_get_resource(dev, IORESOURCE_MEM, 0);
857 irqres = platform_get_resource(dev, IORESOURCE_IRQ, 0);
858 if (!mmres || !irqres)
859 return -ENODEV;
860
861 sport = kzalloc(sizeof(struct uart_pxa_port), GFP_KERNEL);
862 if (!sport)
863 return -ENOMEM;
864
865 sport->clk = clk_get(&dev->dev, NULL);
866 if (IS_ERR(sport->clk)) {
867 ret = PTR_ERR(sport->clk);
868 goto err_free;
869 }
870
871 ret = clk_prepare(sport->clk);
872 if (ret) {
873 clk_put(sport->clk);
874 goto err_free;
875 }
876
877 sport->port.type = PORT_PXA;
878 sport->port.iotype = UPIO_MEM;
879 sport->port.mapbase = mmres->start;
880 sport->port.irq = irqres->start;
881 sport->port.fifosize = 64;
882 sport->port.ops = &serial_pxa_pops;
883 sport->port.dev = &dev->dev;
884 sport->port.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
885 sport->port.uartclk = clk_get_rate(sport->clk);
886
887 ret = serial_pxa_probe_dt(dev, sport);
888 if (ret > 0)
889 sport->port.line = dev->id;
890 else if (ret < 0)
891 goto err_clk;
892 snprintf(sport->name, PXA_NAME_LEN - 1, "UART%d", sport->port.line + 1);
893
894 sport->port.membase = ioremap(mmres->start, resource_size(mmres));
895 if (!sport->port.membase) {
896 ret = -ENOMEM;
897 goto err_clk;
898 }
899
900 serial_pxa_ports[sport->port.line] = sport;
901
902 uart_add_one_port(&serial_pxa_reg, &sport->port);
903 platform_set_drvdata(dev, sport);
904
905 return 0;
906
907 err_clk:
908 clk_unprepare(sport->clk);
909 clk_put(sport->clk);
910 err_free:
911 kfree(sport);
912 return ret;
913 }
914
915 static struct platform_driver serial_pxa_driver = {
916 .probe = serial_pxa_probe,
917
918 .driver = {
919 .name = "pxa2xx-uart",
920 #ifdef CONFIG_PM
921 .pm = &serial_pxa_pm_ops,
922 #endif
923 .suppress_bind_attrs = true,
924 .of_match_table = serial_pxa_dt_ids,
925 },
926 };
927
928 static int __init serial_pxa_init(void)
929 {
930 int ret;
931
932 ret = uart_register_driver(&serial_pxa_reg);
933 if (ret != 0)
934 return ret;
935
936 ret = platform_driver_register(&serial_pxa_driver);
937 if (ret != 0)
938 uart_unregister_driver(&serial_pxa_reg);
939
940 return ret;
941 }
942 device_initcall(serial_pxa_init);
Ubuntu Artful kernel mirror