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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
[linux/fpc-iii.git] / drivers / tty / serial / omap-serial.c
blobfa511ebab67c67efda853be187ca670e20db4679
1 /*
2 * Driver for OMAP-UART controller.
3 * Based on drivers/serial/8250.c
4 *
5 * Copyright (C) 2010 Texas Instruments.
6 *
7 * Authors:
8 * Govindraj R <govindraj.raja@ti.com>
9 * Thara Gopinath <thara@ti.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * Note: This driver is made separate from 8250 driver as we cannot
17 * over load 8250 driver with omap platform specific configuration for
18 * features like DMA, it makes easier to implement features like DMA and
19 * hardware flow control and software flow control configuration with
20 * this driver as required for the omap-platform.
21 */
22
23 #if defined(CONFIG_SERIAL_OMAP_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
24 #define SUPPORT_SYSRQ
25 #endif
26
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/console.h>
30 #include <linux/serial_reg.h>
31 #include <linux/delay.h>
32 #include <linux/slab.h>
33 #include <linux/tty.h>
34 #include <linux/tty_flip.h>
35 #include <linux/platform_device.h>
36 #include <linux/io.h>
37 #include <linux/clk.h>
38 #include <linux/serial_core.h>
39 #include <linux/irq.h>
40 #include <linux/pm_runtime.h>
41 #include <linux/of.h>
42 #include <linux/of_irq.h>
43 #include <linux/gpio.h>
44 #include <linux/of_gpio.h>
45 #include <linux/platform_data/serial-omap.h>
46
47 #include <dt-bindings/gpio/gpio.h>
48
49 #define OMAP_MAX_HSUART_PORTS 6
50
51 #define UART_BUILD_REVISION(x, y) (((x) << 8) | (y))
52
53 #define OMAP_UART_REV_42 0x0402
54 #define OMAP_UART_REV_46 0x0406
55 #define OMAP_UART_REV_52 0x0502
56 #define OMAP_UART_REV_63 0x0603
57
58 #define OMAP_UART_TX_WAKEUP_EN BIT(7)
59
60 /* Feature flags */
61 #define OMAP_UART_WER_HAS_TX_WAKEUP BIT(0)
62
63 #define UART_ERRATA_i202_MDR1_ACCESS BIT(0)
64 #define UART_ERRATA_i291_DMA_FORCEIDLE BIT(1)
65
66 #define DEFAULT_CLK_SPEED 48000000 /* 48Mhz*/
67
68 /* SCR register bitmasks */
69 #define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK (1 << 7)
70 #define OMAP_UART_SCR_TX_TRIG_GRANU1_MASK (1 << 6)
71 #define OMAP_UART_SCR_TX_EMPTY (1 << 3)
72
73 /* FCR register bitmasks */
74 #define OMAP_UART_FCR_RX_FIFO_TRIG_MASK (0x3 << 6)
75 #define OMAP_UART_FCR_TX_FIFO_TRIG_MASK (0x3 << 4)
76
77 /* MVR register bitmasks */
78 #define OMAP_UART_MVR_SCHEME_SHIFT 30
79
80 #define OMAP_UART_LEGACY_MVR_MAJ_MASK 0xf0
81 #define OMAP_UART_LEGACY_MVR_MAJ_SHIFT 4
82 #define OMAP_UART_LEGACY_MVR_MIN_MASK 0x0f
83
84 #define OMAP_UART_MVR_MAJ_MASK 0x700
85 #define OMAP_UART_MVR_MAJ_SHIFT 8
86 #define OMAP_UART_MVR_MIN_MASK 0x3f
87
88 #define OMAP_UART_DMA_CH_FREE -1
89
90 #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
91 #define OMAP_MODE13X_SPEED 230400
92
93 /* WER = 0x7F
94 * Enable module level wakeup in WER reg
95 */
96 #define OMAP_UART_WER_MOD_WKUP 0X7F
97
98 /* Enable XON/XOFF flow control on output */
99 #define OMAP_UART_SW_TX 0x08
100
101 /* Enable XON/XOFF flow control on input */
102 #define OMAP_UART_SW_RX 0x02
103
104 #define OMAP_UART_SW_CLR 0xF0
105
106 #define OMAP_UART_TCR_TRIG 0x0F
107
108 struct uart_omap_dma {
109 u8 uart_dma_tx;
110 u8 uart_dma_rx;
111 int rx_dma_channel;
112 int tx_dma_channel;
113 dma_addr_t rx_buf_dma_phys;
114 dma_addr_t tx_buf_dma_phys;
115 unsigned int uart_base;
116 /*
117 * Buffer for rx dma.It is not required for tx because the buffer
118 * comes from port structure.
119 */
120 unsigned char *rx_buf;
121 unsigned int prev_rx_dma_pos;
122 int tx_buf_size;
123 int tx_dma_used;
124 int rx_dma_used;
125 spinlock_t tx_lock;
126 spinlock_t rx_lock;
127 /* timer to poll activity on rx dma */
128 struct timer_list rx_timer;
129 unsigned int rx_buf_size;
130 unsigned int rx_poll_rate;
131 unsigned int rx_timeout;
132 };
133
134 struct uart_omap_port {
135 struct uart_port port;
136 struct uart_omap_dma uart_dma;
137 struct device *dev;
138 int wakeirq;
139
140 unsigned char ier;
141 unsigned char lcr;
142 unsigned char mcr;
143 unsigned char fcr;
144 unsigned char efr;
145 unsigned char dll;
146 unsigned char dlh;
147 unsigned char mdr1;
148 unsigned char scr;
149 unsigned char wer;
150
151 int use_dma;
152 /*
153 * Some bits in registers are cleared on a read, so they must
154 * be saved whenever the register is read but the bits will not
155 * be immediately processed.
156 */
157 unsigned int lsr_break_flag;
158 unsigned char msr_saved_flags;
159 char name[20];
160 unsigned long port_activity;
161 int context_loss_cnt;
162 u32 errata;
163 u8 wakeups_enabled;
164 u32 features;
165
166 int DTR_gpio;
167 int DTR_inverted;
168 int DTR_active;
169
170 struct serial_rs485 rs485;
171 int rts_gpio;
172
173 struct pm_qos_request pm_qos_request;
174 u32 latency;
175 u32 calc_latency;
176 struct work_struct qos_work;
177 bool is_suspending;
178 };
179
180 #define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port)))
181
182 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
183
184 /* Forward declaration of functions */
185 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1);
186
187 static struct workqueue_struct *serial_omap_uart_wq;
188
189 static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
190 {
191 offset <<= up->port.regshift;
192 return readw(up->port.membase + offset);
193 }
194
195 static inline void serial_out(struct uart_omap_port *up, int offset, int value)
196 {
197 offset <<= up->port.regshift;
198 writew(value, up->port.membase + offset);
199 }
200
201 static inline void serial_omap_clear_fifos(struct uart_omap_port *up)
202 {
203 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
204 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
205 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
206 serial_out(up, UART_FCR, 0);
207 }
208
209 static int serial_omap_get_context_loss_count(struct uart_omap_port *up)
210 {
211 struct omap_uart_port_info *pdata = dev_get_platdata(up->dev);
212
213 if (!pdata || !pdata->get_context_loss_count)
214 return -EINVAL;
215
216 return pdata->get_context_loss_count(up->dev);
217 }
218
219 static inline void serial_omap_enable_wakeirq(struct uart_omap_port *up,
220 bool enable)
221 {
222 if (!up->wakeirq)
223 return;
224
225 if (enable)
226 enable_irq(up->wakeirq);
227 else
228 disable_irq(up->wakeirq);
229 }
230
231 static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable)
232 {
233 struct omap_uart_port_info *pdata = dev_get_platdata(up->dev);
234
235 serial_omap_enable_wakeirq(up, enable);
236 if (!pdata || !pdata->enable_wakeup)
237 return;
238
239 pdata->enable_wakeup(up->dev, enable);
240 }
241
242 /*
243 * serial_omap_baud_is_mode16 - check if baud rate is MODE16X
244 * @port: uart port info
245 * @baud: baudrate for which mode needs to be determined
246 *
247 * Returns true if baud rate is MODE16X and false if MODE13X
248 * Original table in OMAP TRM named "UART Mode Baud Rates, Divisor Values,
249 * and Error Rates" determines modes not for all common baud rates.
250 * E.g. for 1000000 baud rate mode must be 16x, but according to that
251 * table it's determined as 13x.
252 */
253 static bool
254 serial_omap_baud_is_mode16(struct uart_port *port, unsigned int baud)
255 {
256 unsigned int n13 = port->uartclk / (13 * baud);
257 unsigned int n16 = port->uartclk / (16 * baud);
258 int baudAbsDiff13 = baud - (port->uartclk / (13 * n13));
259 int baudAbsDiff16 = baud - (port->uartclk / (16 * n16));
260 if (baudAbsDiff13 < 0)
261 baudAbsDiff13 = -baudAbsDiff13;
262 if (baudAbsDiff16 < 0)
263 baudAbsDiff16 = -baudAbsDiff16;
264
265 return (baudAbsDiff13 >= baudAbsDiff16);
266 }
267
268 /*
269 * serial_omap_get_divisor - calculate divisor value
270 * @port: uart port info
271 * @baud: baudrate for which divisor needs to be calculated.
272 */
273 static unsigned int
274 serial_omap_get_divisor(struct uart_port *port, unsigned int baud)
275 {
276 unsigned int mode;
277
278 if (!serial_omap_baud_is_mode16(port, baud))
279 mode = 13;
280 else
281 mode = 16;
282 return port->uartclk/(mode * baud);
283 }
284
285 static void serial_omap_enable_ms(struct uart_port *port)
286 {
287 struct uart_omap_port *up = to_uart_omap_port(port);
288
289 dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line);
290
291 pm_runtime_get_sync(up->dev);
292 up->ier |= UART_IER_MSI;
293 serial_out(up, UART_IER, up->ier);
294 pm_runtime_mark_last_busy(up->dev);
295 pm_runtime_put_autosuspend(up->dev);
296 }
297
298 static void serial_omap_stop_tx(struct uart_port *port)
299 {
300 struct uart_omap_port *up = to_uart_omap_port(port);
301 int res;
302
303 pm_runtime_get_sync(up->dev);
304
305 /* Handle RS-485 */
306 if (up->rs485.flags & SER_RS485_ENABLED) {
307 if (up->scr & OMAP_UART_SCR_TX_EMPTY) {
308 /* THR interrupt is fired when both TX FIFO and TX
309 * shift register are empty. This means there's nothing
310 * left to transmit now, so make sure the THR interrupt
311 * is fired when TX FIFO is below the trigger level,
312 * disable THR interrupts and toggle the RS-485 GPIO
313 * data direction pin if needed.
314 */
315 up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
316 serial_out(up, UART_OMAP_SCR, up->scr);
317 res = (up->rs485.flags & SER_RS485_RTS_AFTER_SEND) ? 1 : 0;
318 if (gpio_get_value(up->rts_gpio) != res) {
319 if (up->rs485.delay_rts_after_send > 0)
320 mdelay(up->rs485.delay_rts_after_send);
321 gpio_set_value(up->rts_gpio, res);
322 }
323 } else {
324 /* We're asked to stop, but there's still stuff in the
325 * UART FIFO, so make sure the THR interrupt is fired
326 * when both TX FIFO and TX shift register are empty.
327 * The next THR interrupt (if no transmission is started
328 * in the meantime) will indicate the end of a
329 * transmission. Therefore we _don't_ disable THR
330 * interrupts in this situation.
331 */
332 up->scr |= OMAP_UART_SCR_TX_EMPTY;
333 serial_out(up, UART_OMAP_SCR, up->scr);
334 return;
335 }
336 }
337
338 if (up->ier & UART_IER_THRI) {
339 up->ier &= ~UART_IER_THRI;
340 serial_out(up, UART_IER, up->ier);
341 }
342
343 if ((up->rs485.flags & SER_RS485_ENABLED) &&
344 !(up->rs485.flags & SER_RS485_RX_DURING_TX)) {
345 up->ier = UART_IER_RLSI | UART_IER_RDI;
346 serial_out(up, UART_IER, up->ier);
347 }
348
349 pm_runtime_mark_last_busy(up->dev);
350 pm_runtime_put_autosuspend(up->dev);
351 }
352
353 static void serial_omap_stop_rx(struct uart_port *port)
354 {
355 struct uart_omap_port *up = to_uart_omap_port(port);
356
357 pm_runtime_get_sync(up->dev);
358 up->ier &= ~UART_IER_RLSI;
359 up->port.read_status_mask &= ~UART_LSR_DR;
360 serial_out(up, UART_IER, up->ier);
361 pm_runtime_mark_last_busy(up->dev);
362 pm_runtime_put_autosuspend(up->dev);
363 }
364
365 static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
366 {
367 struct circ_buf *xmit = &up->port.state->xmit;
368 int count;
369
370 if (up->port.x_char) {
371 serial_out(up, UART_TX, up->port.x_char);
372 up->port.icount.tx++;
373 up->port.x_char = 0;
374 return;
375 }
376 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
377 serial_omap_stop_tx(&up->port);
378 return;
379 }
380 count = up->port.fifosize / 4;
381 do {
382 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
383 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
384 up->port.icount.tx++;
385 if (uart_circ_empty(xmit))
386 break;
387 } while (--count > 0);
388
389 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
390 spin_unlock(&up->port.lock);
391 uart_write_wakeup(&up->port);
392 spin_lock(&up->port.lock);
393 }
394
395 if (uart_circ_empty(xmit))
396 serial_omap_stop_tx(&up->port);
397 }
398
399 static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
400 {
401 if (!(up->ier & UART_IER_THRI)) {
402 up->ier |= UART_IER_THRI;
403 serial_out(up, UART_IER, up->ier);
404 }
405 }
406
407 static void serial_omap_start_tx(struct uart_port *port)
408 {
409 struct uart_omap_port *up = to_uart_omap_port(port);
410 int res;
411
412 pm_runtime_get_sync(up->dev);
413
414 /* Handle RS-485 */
415 if (up->rs485.flags & SER_RS485_ENABLED) {
416 /* Fire THR interrupts when FIFO is below trigger level */
417 up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
418 serial_out(up, UART_OMAP_SCR, up->scr);
419
420 /* if rts not already enabled */
421 res = (up->rs485.flags & SER_RS485_RTS_ON_SEND) ? 1 : 0;
422 if (gpio_get_value(up->rts_gpio) != res) {
423 gpio_set_value(up->rts_gpio, res);
424 if (up->rs485.delay_rts_before_send > 0)
425 mdelay(up->rs485.delay_rts_before_send);
426 }
427 }
428
429 if ((up->rs485.flags & SER_RS485_ENABLED) &&
430 !(up->rs485.flags & SER_RS485_RX_DURING_TX))
431 serial_omap_stop_rx(port);
432
433 serial_omap_enable_ier_thri(up);
434 pm_runtime_mark_last_busy(up->dev);
435 pm_runtime_put_autosuspend(up->dev);
436 }
437
438 static void serial_omap_throttle(struct uart_port *port)
439 {
440 struct uart_omap_port *up = to_uart_omap_port(port);
441 unsigned long flags;
442
443 pm_runtime_get_sync(up->dev);
444 spin_lock_irqsave(&up->port.lock, flags);
445 up->ier &= ~(UART_IER_RLSI | UART_IER_RDI);
446 serial_out(up, UART_IER, up->ier);
447 spin_unlock_irqrestore(&up->port.lock, flags);
448 pm_runtime_mark_last_busy(up->dev);
449 pm_runtime_put_autosuspend(up->dev);
450 }
451
452 static void serial_omap_unthrottle(struct uart_port *port)
453 {
454 struct uart_omap_port *up = to_uart_omap_port(port);
455 unsigned long flags;
456
457 pm_runtime_get_sync(up->dev);
458 spin_lock_irqsave(&up->port.lock, flags);
459 up->ier |= UART_IER_RLSI | UART_IER_RDI;
460 serial_out(up, UART_IER, up->ier);
461 spin_unlock_irqrestore(&up->port.lock, flags);
462 pm_runtime_mark_last_busy(up->dev);
463 pm_runtime_put_autosuspend(up->dev);
464 }
465
466 static unsigned int check_modem_status(struct uart_omap_port *up)
467 {
468 unsigned int status;
469
470 status = serial_in(up, UART_MSR);
471 status |= up->msr_saved_flags;
472 up->msr_saved_flags = 0;
473 if ((status & UART_MSR_ANY_DELTA) == 0)
474 return status;
475
476 if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
477 up->port.state != NULL) {
478 if (status & UART_MSR_TERI)
479 up->port.icount.rng++;
480 if (status & UART_MSR_DDSR)
481 up->port.icount.dsr++;
482 if (status & UART_MSR_DDCD)
483 uart_handle_dcd_change
484 (&up->port, status & UART_MSR_DCD);
485 if (status & UART_MSR_DCTS)
486 uart_handle_cts_change
487 (&up->port, status & UART_MSR_CTS);
488 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
489 }
490
491 return status;
492 }
493
494 static void serial_omap_rlsi(struct uart_omap_port *up, unsigned int lsr)
495 {
496 unsigned int flag;
497 unsigned char ch = 0;
498
499 if (likely(lsr & UART_LSR_DR))
500 ch = serial_in(up, UART_RX);
501
502 up->port.icount.rx++;
503 flag = TTY_NORMAL;
504
505 if (lsr & UART_LSR_BI) {
506 flag = TTY_BREAK;
507 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
508 up->port.icount.brk++;
509 /*
510 * We do the SysRQ and SAK checking
511 * here because otherwise the break
512 * may get masked by ignore_status_mask
513 * or read_status_mask.
514 */
515 if (uart_handle_break(&up->port))
516 return;
517
518 }
519
520 if (lsr & UART_LSR_PE) {
521 flag = TTY_PARITY;
522 up->port.icount.parity++;
523 }
524
525 if (lsr & UART_LSR_FE) {
526 flag = TTY_FRAME;
527 up->port.icount.frame++;
528 }
529
530 if (lsr & UART_LSR_OE)
531 up->port.icount.overrun++;
532
533 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
534 if (up->port.line == up->port.cons->index) {
535 /* Recover the break flag from console xmit */
536 lsr |= up->lsr_break_flag;
537 }
538 #endif
539 uart_insert_char(&up->port, lsr, UART_LSR_OE, 0, flag);
540 }
541
542 static void serial_omap_rdi(struct uart_omap_port *up, unsigned int lsr)
543 {
544 unsigned char ch = 0;
545 unsigned int flag;
546
547 if (!(lsr & UART_LSR_DR))
548 return;
549
550 ch = serial_in(up, UART_RX);
551 flag = TTY_NORMAL;
552 up->port.icount.rx++;
553
554 if (uart_handle_sysrq_char(&up->port, ch))
555 return;
556
557 uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
558 }
559
560 /**
561 * serial_omap_irq() - This handles the interrupt from one port
562 * @irq: uart port irq number
563 * @dev_id: uart port info
564 */
565 static irqreturn_t serial_omap_irq(int irq, void *dev_id)
566 {
567 struct uart_omap_port *up = dev_id;
568 unsigned int iir, lsr;
569 unsigned int type;
570 irqreturn_t ret = IRQ_NONE;
571 int max_count = 256;
572
573 spin_lock(&up->port.lock);
574 pm_runtime_get_sync(up->dev);
575
576 do {
577 iir = serial_in(up, UART_IIR);
578 if (iir & UART_IIR_NO_INT)
579 break;
580
581 ret = IRQ_HANDLED;
582 lsr = serial_in(up, UART_LSR);
583
584 /* extract IRQ type from IIR register */
585 type = iir & 0x3e;
586
587 switch (type) {
588 case UART_IIR_MSI:
589 check_modem_status(up);
590 break;
591 case UART_IIR_THRI:
592 transmit_chars(up, lsr);
593 break;
594 case UART_IIR_RX_TIMEOUT:
595 /* FALLTHROUGH */
596 case UART_IIR_RDI:
597 serial_omap_rdi(up, lsr);
598 break;
599 case UART_IIR_RLSI:
600 serial_omap_rlsi(up, lsr);
601 break;
602 case UART_IIR_CTS_RTS_DSR:
603 /* simply try again */
604 break;
605 case UART_IIR_XOFF:
606 /* FALLTHROUGH */
607 default:
608 break;
609 }
610 } while (!(iir & UART_IIR_NO_INT) && max_count--);
611
612 spin_unlock(&up->port.lock);
613
614 tty_flip_buffer_push(&up->port.state->port);
615
616 pm_runtime_mark_last_busy(up->dev);
617 pm_runtime_put_autosuspend(up->dev);
618 up->port_activity = jiffies;
619
620 return ret;
621 }
622
623 static unsigned int serial_omap_tx_empty(struct uart_port *port)
624 {
625 struct uart_omap_port *up = to_uart_omap_port(port);
626 unsigned long flags = 0;
627 unsigned int ret = 0;
628
629 pm_runtime_get_sync(up->dev);
630 dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->port.line);
631 spin_lock_irqsave(&up->port.lock, flags);
632 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
633 spin_unlock_irqrestore(&up->port.lock, flags);
634 pm_runtime_mark_last_busy(up->dev);
635 pm_runtime_put_autosuspend(up->dev);
636 return ret;
637 }
638
639 static unsigned int serial_omap_get_mctrl(struct uart_port *port)
640 {
641 struct uart_omap_port *up = to_uart_omap_port(port);
642 unsigned int status;
643 unsigned int ret = 0;
644
645 pm_runtime_get_sync(up->dev);
646 status = check_modem_status(up);
647 pm_runtime_mark_last_busy(up->dev);
648 pm_runtime_put_autosuspend(up->dev);
649
650 dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->port.line);
651
652 if (status & UART_MSR_DCD)
653 ret |= TIOCM_CAR;
654 if (status & UART_MSR_RI)
655 ret |= TIOCM_RNG;
656 if (status & UART_MSR_DSR)
657 ret |= TIOCM_DSR;
658 if (status & UART_MSR_CTS)
659 ret |= TIOCM_CTS;
660 return ret;
661 }
662
663 static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
664 {
665 struct uart_omap_port *up = to_uart_omap_port(port);
666 unsigned char mcr = 0, old_mcr;
667
668 dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->port.line);
669 if (mctrl & TIOCM_RTS)
670 mcr |= UART_MCR_RTS;
671 if (mctrl & TIOCM_DTR)
672 mcr |= UART_MCR_DTR;
673 if (mctrl & TIOCM_OUT1)
674 mcr |= UART_MCR_OUT1;
675 if (mctrl & TIOCM_OUT2)
676 mcr |= UART_MCR_OUT2;
677 if (mctrl & TIOCM_LOOP)
678 mcr |= UART_MCR_LOOP;
679
680 pm_runtime_get_sync(up->dev);
681 old_mcr = serial_in(up, UART_MCR);
682 old_mcr &= ~(UART_MCR_LOOP | UART_MCR_OUT2 | UART_MCR_OUT1 |
683 UART_MCR_DTR | UART_MCR_RTS);
684 up->mcr = old_mcr | mcr;
685 serial_out(up, UART_MCR, up->mcr);
686 pm_runtime_mark_last_busy(up->dev);
687 pm_runtime_put_autosuspend(up->dev);
688
689 if (gpio_is_valid(up->DTR_gpio) &&
690 !!(mctrl & TIOCM_DTR) != up->DTR_active) {
691 up->DTR_active = !up->DTR_active;
692 if (gpio_cansleep(up->DTR_gpio))
693 schedule_work(&up->qos_work);
694 else
695 gpio_set_value(up->DTR_gpio,
696 up->DTR_active != up->DTR_inverted);
697 }
698 }
699
700 static void serial_omap_break_ctl(struct uart_port *port, int break_state)
701 {
702 struct uart_omap_port *up = to_uart_omap_port(port);
703 unsigned long flags = 0;
704
705 dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line);
706 pm_runtime_get_sync(up->dev);
707 spin_lock_irqsave(&up->port.lock, flags);
708 if (break_state == -1)
709 up->lcr |= UART_LCR_SBC;
710 else
711 up->lcr &= ~UART_LCR_SBC;
712 serial_out(up, UART_LCR, up->lcr);
713 spin_unlock_irqrestore(&up->port.lock, flags);
714 pm_runtime_mark_last_busy(up->dev);
715 pm_runtime_put_autosuspend(up->dev);
716 }
717
718 static int serial_omap_startup(struct uart_port *port)
719 {
720 struct uart_omap_port *up = to_uart_omap_port(port);
721 unsigned long flags = 0;
722 int retval;
723
724 /*
725 * Allocate the IRQ
726 */
727 retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags,
728 up->name, up);
729 if (retval)
730 return retval;
731
732 /* Optional wake-up IRQ */
733 if (up->wakeirq) {
734 retval = request_irq(up->wakeirq, serial_omap_irq,
735 up->port.irqflags, up->name, up);
736 if (retval) {
737 free_irq(up->port.irq, up);
738 return retval;
739 }
740 disable_irq(up->wakeirq);
741 } else {
742 dev_info(up->port.dev, "no wakeirq for uart%d\n",
743 up->port.line);
744 }
745
746 dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line);
747
748 pm_runtime_get_sync(up->dev);
749 /*
750 * Clear the FIFO buffers and disable them.
751 * (they will be reenabled in set_termios())
752 */
753 serial_omap_clear_fifos(up);
754 /* For Hardware flow control */
755 serial_out(up, UART_MCR, UART_MCR_RTS);
756
757 /*
758 * Clear the interrupt registers.
759 */
760 (void) serial_in(up, UART_LSR);
761 if (serial_in(up, UART_LSR) & UART_LSR_DR)
762 (void) serial_in(up, UART_RX);
763 (void) serial_in(up, UART_IIR);
764 (void) serial_in(up, UART_MSR);
765
766 /*
767 * Now, initialize the UART
768 */
769 serial_out(up, UART_LCR, UART_LCR_WLEN8);
770 spin_lock_irqsave(&up->port.lock, flags);
771 /*
772 * Most PC uarts need OUT2 raised to enable interrupts.
773 */
774 up->port.mctrl |= TIOCM_OUT2;
775 serial_omap_set_mctrl(&up->port, up->port.mctrl);
776 spin_unlock_irqrestore(&up->port.lock, flags);
777
778 up->msr_saved_flags = 0;
779 /*
780 * Finally, enable interrupts. Note: Modem status interrupts
781 * are set via set_termios(), which will be occurring imminently
782 * anyway, so we don't enable them here.
783 */
784 up->ier = UART_IER_RLSI | UART_IER_RDI;
785 serial_out(up, UART_IER, up->ier);
786
787 /* Enable module level wake up */
788 up->wer = OMAP_UART_WER_MOD_WKUP;
789 if (up->features & OMAP_UART_WER_HAS_TX_WAKEUP)
790 up->wer |= OMAP_UART_TX_WAKEUP_EN;
791
792 serial_out(up, UART_OMAP_WER, up->wer);
793
794 pm_runtime_mark_last_busy(up->dev);
795 pm_runtime_put_autosuspend(up->dev);
796 up->port_activity = jiffies;
797 return 0;
798 }
799
800 static void serial_omap_shutdown(struct uart_port *port)
801 {
802 struct uart_omap_port *up = to_uart_omap_port(port);
803 unsigned long flags = 0;
804
805 dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->port.line);
806
807 pm_runtime_get_sync(up->dev);
808 /*
809 * Disable interrupts from this port
810 */
811 up->ier = 0;
812 serial_out(up, UART_IER, 0);
813
814 spin_lock_irqsave(&up->port.lock, flags);
815 up->port.mctrl &= ~TIOCM_OUT2;
816 serial_omap_set_mctrl(&up->port, up->port.mctrl);
817 spin_unlock_irqrestore(&up->port.lock, flags);
818
819 /*
820 * Disable break condition and FIFOs
821 */
822 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
823 serial_omap_clear_fifos(up);
824
825 /*
826 * Read data port to reset things, and then free the irq
827 */
828 if (serial_in(up, UART_LSR) & UART_LSR_DR)
829 (void) serial_in(up, UART_RX);
830
831 pm_runtime_mark_last_busy(up->dev);
832 pm_runtime_put_autosuspend(up->dev);
833 free_irq(up->port.irq, up);
834 if (up->wakeirq)
835 free_irq(up->wakeirq, up);
836 }
837
838 static void serial_omap_uart_qos_work(struct work_struct *work)
839 {
840 struct uart_omap_port *up = container_of(work, struct uart_omap_port,
841 qos_work);
842
843 pm_qos_update_request(&up->pm_qos_request, up->latency);
844 if (gpio_is_valid(up->DTR_gpio))
845 gpio_set_value_cansleep(up->DTR_gpio,
846 up->DTR_active != up->DTR_inverted);
847 }
848
849 static void
850 serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
851 struct ktermios *old)
852 {
853 struct uart_omap_port *up = to_uart_omap_port(port);
854 unsigned char cval = 0;
855 unsigned long flags = 0;
856 unsigned int baud, quot;
857
858 switch (termios->c_cflag & CSIZE) {
859 case CS5:
860 cval = UART_LCR_WLEN5;
861 break;
862 case CS6:
863 cval = UART_LCR_WLEN6;
864 break;
865 case CS7:
866 cval = UART_LCR_WLEN7;
867 break;
868 default:
869 case CS8:
870 cval = UART_LCR_WLEN8;
871 break;
872 }
873
874 if (termios->c_cflag & CSTOPB)
875 cval |= UART_LCR_STOP;
876 if (termios->c_cflag & PARENB)
877 cval |= UART_LCR_PARITY;
878 if (!(termios->c_cflag & PARODD))
879 cval |= UART_LCR_EPAR;
880 if (termios->c_cflag & CMSPAR)
881 cval |= UART_LCR_SPAR;
882
883 /*
884 * Ask the core to calculate the divisor for us.
885 */
886
887 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13);
888 quot = serial_omap_get_divisor(port, baud);
889
890 /* calculate wakeup latency constraint */
891 up->calc_latency = (USEC_PER_SEC * up->port.fifosize) / (baud / 8);
892 up->latency = up->calc_latency;
893 schedule_work(&up->qos_work);
894
895 up->dll = quot & 0xff;
896 up->dlh = quot >> 8;
897 up->mdr1 = UART_OMAP_MDR1_DISABLE;
898
899 up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 |
900 UART_FCR_ENABLE_FIFO;
901
902 /*
903 * Ok, we're now changing the port state. Do it with
904 * interrupts disabled.
905 */
906 pm_runtime_get_sync(up->dev);
907 spin_lock_irqsave(&up->port.lock, flags);
908
909 /*
910 * Update the per-port timeout.
911 */
912 uart_update_timeout(port, termios->c_cflag, baud);
913
914 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
915 if (termios->c_iflag & INPCK)
916 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
917 if (termios->c_iflag & (BRKINT | PARMRK))
918 up->port.read_status_mask |= UART_LSR_BI;
919
920 /*
921 * Characters to ignore
922 */
923 up->port.ignore_status_mask = 0;
924 if (termios->c_iflag & IGNPAR)
925 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
926 if (termios->c_iflag & IGNBRK) {
927 up->port.ignore_status_mask |= UART_LSR_BI;
928 /*
929 * If we're ignoring parity and break indicators,
930 * ignore overruns too (for real raw support).
931 */
932 if (termios->c_iflag & IGNPAR)
933 up->port.ignore_status_mask |= UART_LSR_OE;
934 }
935
936 /*
937 * ignore all characters if CREAD is not set
938 */
939 if ((termios->c_cflag & CREAD) == 0)
940 up->port.ignore_status_mask |= UART_LSR_DR;
941
942 /*
943 * Modem status interrupts
944 */
945 up->ier &= ~UART_IER_MSI;
946 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
947 up->ier |= UART_IER_MSI;
948 serial_out(up, UART_IER, up->ier);
949 serial_out(up, UART_LCR, cval); /* reset DLAB */
950 up->lcr = cval;
951 up->scr = 0;
952
953 /* FIFOs and DMA Settings */
954
955 /* FCR can be changed only when the
956 * baud clock is not running
957 * DLL_REG and DLH_REG set to 0.
958 */
959 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
960 serial_out(up, UART_DLL, 0);
961 serial_out(up, UART_DLM, 0);
962 serial_out(up, UART_LCR, 0);
963
964 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
965
966 up->efr = serial_in(up, UART_EFR) & ~UART_EFR_ECB;
967 up->efr &= ~UART_EFR_SCD;
968 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
969
970 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
971 up->mcr = serial_in(up, UART_MCR) & ~UART_MCR_TCRTLR;
972 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
973 /* FIFO ENABLE, DMA MODE */
974
975 up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK;
976 /*
977 * NOTE: Setting OMAP_UART_SCR_RX_TRIG_GRANU1_MASK
978 * sets Enables the granularity of 1 for TRIGGER RX
979 * level. Along with setting RX FIFO trigger level
980 * to 1 (as noted below, 16 characters) and TLR[3:0]
981 * to zero this will result RX FIFO threshold level
982 * to 1 character, instead of 16 as noted in comment
983 * below.
984 */
985
986 /* Set receive FIFO threshold to 16 characters and
987 * transmit FIFO threshold to 32 spaces
988 */
989 up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK;
990 up->fcr &= ~OMAP_UART_FCR_TX_FIFO_TRIG_MASK;
991 up->fcr |= UART_FCR6_R_TRIGGER_16 | UART_FCR6_T_TRIGGER_24 |
992 UART_FCR_ENABLE_FIFO;
993
994 serial_out(up, UART_FCR, up->fcr);
995 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
996
997 serial_out(up, UART_OMAP_SCR, up->scr);
998
999 /* Reset UART_MCR_TCRTLR: this must be done with the EFR_ECB bit set */
1000 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
1001 serial_out(up, UART_MCR, up->mcr);
1002 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1003 serial_out(up, UART_EFR, up->efr);
1004 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
1005
1006 /* Protocol, Baud Rate, and Interrupt Settings */
1007
1008 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1009 serial_omap_mdr1_errataset(up, up->mdr1);
1010 else
1011 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1012
1013 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1014 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
1015
1016 serial_out(up, UART_LCR, 0);
1017 serial_out(up, UART_IER, 0);
1018 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1019
1020 serial_out(up, UART_DLL, up->dll); /* LS of divisor */
1021 serial_out(up, UART_DLM, up->dlh); /* MS of divisor */
1022
1023 serial_out(up, UART_LCR, 0);
1024 serial_out(up, UART_IER, up->ier);
1025 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1026
1027 serial_out(up, UART_EFR, up->efr);
1028 serial_out(up, UART_LCR, cval);
1029
1030 if (!serial_omap_baud_is_mode16(port, baud))
1031 up->mdr1 = UART_OMAP_MDR1_13X_MODE;
1032 else
1033 up->mdr1 = UART_OMAP_MDR1_16X_MODE;
1034
1035 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1036 serial_omap_mdr1_errataset(up, up->mdr1);
1037 else
1038 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1039
1040 /* Configure flow control */
1041 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1042
1043 /* XON1/XOFF1 accessible mode B, TCRTLR=0, ECB=0 */
1044 serial_out(up, UART_XON1, termios->c_cc[VSTART]);
1045 serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]);
1046
1047 /* Enable access to TCR/TLR */
1048 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
1049 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
1050 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
1051
1052 serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
1053
1054 if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) {
1055 /* Enable AUTORTS and AUTOCTS */
1056 up->efr |= UART_EFR_CTS | UART_EFR_RTS;
1057
1058 /* Ensure MCR RTS is asserted */
1059 up->mcr |= UART_MCR_RTS;
1060 } else {
1061 /* Disable AUTORTS and AUTOCTS */
1062 up->efr &= ~(UART_EFR_CTS | UART_EFR_RTS);
1063 }
1064
1065 if (up->port.flags & UPF_SOFT_FLOW) {
1066 /* clear SW control mode bits */
1067 up->efr &= OMAP_UART_SW_CLR;
1068
1069 /*
1070 * IXON Flag:
1071 * Enable XON/XOFF flow control on input.
1072 * Receiver compares XON1, XOFF1.
1073 */
1074 if (termios->c_iflag & IXON)
1075 up->efr |= OMAP_UART_SW_RX;
1076
1077 /*
1078 * IXOFF Flag:
1079 * Enable XON/XOFF flow control on output.
1080 * Transmit XON1, XOFF1
1081 */
1082 if (termios->c_iflag & IXOFF)
1083 up->efr |= OMAP_UART_SW_TX;
1084
1085 /*
1086 * IXANY Flag:
1087 * Enable any character to restart output.
1088 * Operation resumes after receiving any
1089 * character after recognition of the XOFF character
1090 */
1091 if (termios->c_iflag & IXANY)
1092 up->mcr |= UART_MCR_XONANY;
1093 else
1094 up->mcr &= ~UART_MCR_XONANY;
1095 }
1096 serial_out(up, UART_MCR, up->mcr);
1097 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1098 serial_out(up, UART_EFR, up->efr);
1099 serial_out(up, UART_LCR, up->lcr);
1100
1101 serial_omap_set_mctrl(&up->port, up->port.mctrl);
1102
1103 spin_unlock_irqrestore(&up->port.lock, flags);
1104 pm_runtime_mark_last_busy(up->dev);
1105 pm_runtime_put_autosuspend(up->dev);
1106 dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line);
1107 }
1108
1109 static void
1110 serial_omap_pm(struct uart_port *port, unsigned int state,
1111 unsigned int oldstate)
1112 {
1113 struct uart_omap_port *up = to_uart_omap_port(port);
1114 unsigned char efr;
1115
1116 dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line);
1117
1118 pm_runtime_get_sync(up->dev);
1119 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1120 efr = serial_in(up, UART_EFR);
1121 serial_out(up, UART_EFR, efr | UART_EFR_ECB);
1122 serial_out(up, UART_LCR, 0);
1123
1124 serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0);
1125 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1126 serial_out(up, UART_EFR, efr);
1127 serial_out(up, UART_LCR, 0);
1128
1129 if (!device_may_wakeup(up->dev)) {
1130 if (!state)
1131 pm_runtime_forbid(up->dev);
1132 else
1133 pm_runtime_allow(up->dev);
1134 }
1135
1136 pm_runtime_mark_last_busy(up->dev);
1137 pm_runtime_put_autosuspend(up->dev);
1138 }
1139
1140 static void serial_omap_release_port(struct uart_port *port)
1141 {
1142 dev_dbg(port->dev, "serial_omap_release_port+\n");
1143 }
1144
1145 static int serial_omap_request_port(struct uart_port *port)
1146 {
1147 dev_dbg(port->dev, "serial_omap_request_port+\n");
1148 return 0;
1149 }
1150
1151 static void serial_omap_config_port(struct uart_port *port, int flags)
1152 {
1153 struct uart_omap_port *up = to_uart_omap_port(port);
1154
1155 dev_dbg(up->port.dev, "serial_omap_config_port+%d\n",
1156 up->port.line);
1157 up->port.type = PORT_OMAP;
1158 up->port.flags |= UPF_SOFT_FLOW | UPF_HARD_FLOW;
1159 }
1160
1161 static int
1162 serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser)
1163 {
1164 /* we don't want the core code to modify any port params */
1165 dev_dbg(port->dev, "serial_omap_verify_port+\n");
1166 return -EINVAL;
1167 }
1168
1169 static const char *
1170 serial_omap_type(struct uart_port *port)
1171 {
1172 struct uart_omap_port *up = to_uart_omap_port(port);
1173
1174 dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->port.line);
1175 return up->name;
1176 }
1177
1178 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
1179
1180 static inline void wait_for_xmitr(struct uart_omap_port *up)
1181 {
1182 unsigned int status, tmout = 10000;
1183
1184 /* Wait up to 10ms for the character(s) to be sent. */
1185 do {
1186 status = serial_in(up, UART_LSR);
1187
1188 if (status & UART_LSR_BI)
1189 up->lsr_break_flag = UART_LSR_BI;
1190
1191 if (--tmout == 0)
1192 break;
1193 udelay(1);
1194 } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
1195
1196 /* Wait up to 1s for flow control if necessary */
1197 if (up->port.flags & UPF_CONS_FLOW) {
1198 tmout = 1000000;
1199 for (tmout = 1000000; tmout; tmout--) {
1200 unsigned int msr = serial_in(up, UART_MSR);
1201
1202 up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
1203 if (msr & UART_MSR_CTS)
1204 break;
1205
1206 udelay(1);
1207 }
1208 }
1209 }
1210
1211 #ifdef CONFIG_CONSOLE_POLL
1212
1213 static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch)
1214 {
1215 struct uart_omap_port *up = to_uart_omap_port(port);
1216
1217 pm_runtime_get_sync(up->dev);
1218 wait_for_xmitr(up);
1219 serial_out(up, UART_TX, ch);
1220 pm_runtime_mark_last_busy(up->dev);
1221 pm_runtime_put_autosuspend(up->dev);
1222 }
1223
1224 static int serial_omap_poll_get_char(struct uart_port *port)
1225 {
1226 struct uart_omap_port *up = to_uart_omap_port(port);
1227 unsigned int status;
1228
1229 pm_runtime_get_sync(up->dev);
1230 status = serial_in(up, UART_LSR);
1231 if (!(status & UART_LSR_DR)) {
1232 status = NO_POLL_CHAR;
1233 goto out;
1234 }
1235
1236 status = serial_in(up, UART_RX);
1237
1238 out:
1239 pm_runtime_mark_last_busy(up->dev);
1240 pm_runtime_put_autosuspend(up->dev);
1241
1242 return status;
1243 }
1244
1245 #endif /* CONFIG_CONSOLE_POLL */
1246
1247 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
1248
1249 static struct uart_omap_port *serial_omap_console_ports[OMAP_MAX_HSUART_PORTS];
1250
1251 static struct uart_driver serial_omap_reg;
1252
1253 static void serial_omap_console_putchar(struct uart_port *port, int ch)
1254 {
1255 struct uart_omap_port *up = to_uart_omap_port(port);
1256
1257 wait_for_xmitr(up);
1258 serial_out(up, UART_TX, ch);
1259 }
1260
1261 static void
1262 serial_omap_console_write(struct console *co, const char *s,
1263 unsigned int count)
1264 {
1265 struct uart_omap_port *up = serial_omap_console_ports[co->index];
1266 unsigned long flags;
1267 unsigned int ier;
1268 int locked = 1;
1269
1270 pm_runtime_get_sync(up->dev);
1271
1272 local_irq_save(flags);
1273 if (up->port.sysrq)
1274 locked = 0;
1275 else if (oops_in_progress)
1276 locked = spin_trylock(&up->port.lock);
1277 else
1278 spin_lock(&up->port.lock);
1279
1280 /*
1281 * First save the IER then disable the interrupts
1282 */
1283 ier = serial_in(up, UART_IER);
1284 serial_out(up, UART_IER, 0);
1285
1286 uart_console_write(&up->port, s, count, serial_omap_console_putchar);
1287
1288 /*
1289 * Finally, wait for transmitter to become empty
1290 * and restore the IER
1291 */
1292 wait_for_xmitr(up);
1293 serial_out(up, UART_IER, ier);
1294 /*
1295 * The receive handling will happen properly because the
1296 * receive ready bit will still be set; it is not cleared
1297 * on read. However, modem control will not, we must
1298 * call it if we have saved something in the saved flags
1299 * while processing with interrupts off.
1300 */
1301 if (up->msr_saved_flags)
1302 check_modem_status(up);
1303
1304 pm_runtime_mark_last_busy(up->dev);
1305 pm_runtime_put_autosuspend(up->dev);
1306 if (locked)
1307 spin_unlock(&up->port.lock);
1308 local_irq_restore(flags);
1309 }
1310
1311 static int __init
1312 serial_omap_console_setup(struct console *co, char *options)
1313 {
1314 struct uart_omap_port *up;
1315 int baud = 115200;
1316 int bits = 8;
1317 int parity = 'n';
1318 int flow = 'n';
1319
1320 if (serial_omap_console_ports[co->index] == NULL)
1321 return -ENODEV;
1322 up = serial_omap_console_ports[co->index];
1323
1324 if (options)
1325 uart_parse_options(options, &baud, &parity, &bits, &flow);
1326
1327 return uart_set_options(&up->port, co, baud, parity, bits, flow);
1328 }
1329
1330 static struct console serial_omap_console = {
1331 .name = OMAP_SERIAL_NAME,
1332 .write = serial_omap_console_write,
1333 .device = uart_console_device,
1334 .setup = serial_omap_console_setup,
1335 .flags = CON_PRINTBUFFER,
1336 .index = -1,
1337 .data = &serial_omap_reg,
1338 };
1339
1340 static void serial_omap_add_console_port(struct uart_omap_port *up)
1341 {
1342 serial_omap_console_ports[up->port.line] = up;
1343 }
1344
1345 #define OMAP_CONSOLE (&serial_omap_console)
1346
1347 #else
1348
1349 #define OMAP_CONSOLE NULL
1350
1351 static inline void serial_omap_add_console_port(struct uart_omap_port *up)
1352 {}
1353
1354 #endif
1355
1356 /* Enable or disable the rs485 support */
1357 static void
1358 serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485conf)
1359 {
1360 struct uart_omap_port *up = to_uart_omap_port(port);
1361 unsigned long flags;
1362 unsigned int mode;
1363 int val;
1364
1365 pm_runtime_get_sync(up->dev);
1366 spin_lock_irqsave(&up->port.lock, flags);
1367
1368 /* Disable interrupts from this port */
1369 mode = up->ier;
1370 up->ier = 0;
1371 serial_out(up, UART_IER, 0);
1372
1373 /* store new config */
1374 up->rs485 = *rs485conf;
1375
1376 /*
1377 * Just as a precaution, only allow rs485
1378 * to be enabled if the gpio pin is valid
1379 */
1380 if (gpio_is_valid(up->rts_gpio)) {
1381 /* enable / disable rts */
1382 val = (up->rs485.flags & SER_RS485_ENABLED) ?
1383 SER_RS485_RTS_AFTER_SEND : SER_RS485_RTS_ON_SEND;
1384 val = (up->rs485.flags & val) ? 1 : 0;
1385 gpio_set_value(up->rts_gpio, val);
1386 } else
1387 up->rs485.flags &= ~SER_RS485_ENABLED;
1388
1389 /* Enable interrupts */
1390 up->ier = mode;
1391 serial_out(up, UART_IER, up->ier);
1392
1393 /* If RS-485 is disabled, make sure the THR interrupt is fired when
1394 * TX FIFO is below the trigger level.
1395 */
1396 if (!(up->rs485.flags & SER_RS485_ENABLED) &&
1397 (up->scr & OMAP_UART_SCR_TX_EMPTY)) {
1398 up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
1399 serial_out(up, UART_OMAP_SCR, up->scr);
1400 }
1401
1402 spin_unlock_irqrestore(&up->port.lock, flags);
1403 pm_runtime_mark_last_busy(up->dev);
1404 pm_runtime_put_autosuspend(up->dev);
1405 }
1406
1407 static int
1408 serial_omap_ioctl(struct uart_port *port, unsigned int cmd, unsigned long arg)
1409 {
1410 struct serial_rs485 rs485conf;
1411
1412 switch (cmd) {
1413 case TIOCSRS485:
1414 if (copy_from_user(&rs485conf, (struct serial_rs485 *) arg,
1415 sizeof(rs485conf)))
1416 return -EFAULT;
1417
1418 serial_omap_config_rs485(port, &rs485conf);
1419 break;
1420
1421 case TIOCGRS485:
1422 if (copy_to_user((struct serial_rs485 *) arg,
1423 &(to_uart_omap_port(port)->rs485),
1424 sizeof(rs485conf)))
1425 return -EFAULT;
1426 break;
1427
1428 default:
1429 return -ENOIOCTLCMD;
1430 }
1431 return 0;
1432 }
1433
1434
1435 static struct uart_ops serial_omap_pops = {
1436 .tx_empty = serial_omap_tx_empty,
1437 .set_mctrl = serial_omap_set_mctrl,
1438 .get_mctrl = serial_omap_get_mctrl,
1439 .stop_tx = serial_omap_stop_tx,
1440 .start_tx = serial_omap_start_tx,
1441 .throttle = serial_omap_throttle,
1442 .unthrottle = serial_omap_unthrottle,
1443 .stop_rx = serial_omap_stop_rx,
1444 .enable_ms = serial_omap_enable_ms,
1445 .break_ctl = serial_omap_break_ctl,
1446 .startup = serial_omap_startup,
1447 .shutdown = serial_omap_shutdown,
1448 .set_termios = serial_omap_set_termios,
1449 .pm = serial_omap_pm,
1450 .type = serial_omap_type,
1451 .release_port = serial_omap_release_port,
1452 .request_port = serial_omap_request_port,
1453 .config_port = serial_omap_config_port,
1454 .verify_port = serial_omap_verify_port,
1455 .ioctl = serial_omap_ioctl,
1456 #ifdef CONFIG_CONSOLE_POLL
1457 .poll_put_char = serial_omap_poll_put_char,
1458 .poll_get_char = serial_omap_poll_get_char,
1459 #endif
1460 };
1461
1462 static struct uart_driver serial_omap_reg = {
1463 .owner = THIS_MODULE,
1464 .driver_name = "OMAP-SERIAL",
1465 .dev_name = OMAP_SERIAL_NAME,
1466 .nr = OMAP_MAX_HSUART_PORTS,
1467 .cons = OMAP_CONSOLE,
1468 };
1469
1470 #ifdef CONFIG_PM_SLEEP
1471 static int serial_omap_prepare(struct device *dev)
1472 {
1473 struct uart_omap_port *up = dev_get_drvdata(dev);
1474
1475 up->is_suspending = true;
1476
1477 return 0;
1478 }
1479
1480 static void serial_omap_complete(struct device *dev)
1481 {
1482 struct uart_omap_port *up = dev_get_drvdata(dev);
1483
1484 up->is_suspending = false;
1485 }
1486
1487 static int serial_omap_suspend(struct device *dev)
1488 {
1489 struct uart_omap_port *up = dev_get_drvdata(dev);
1490
1491 uart_suspend_port(&serial_omap_reg, &up->port);
1492 flush_work(&up->qos_work);
1493
1494 return 0;
1495 }
1496
1497 static int serial_omap_resume(struct device *dev)
1498 {
1499 struct uart_omap_port *up = dev_get_drvdata(dev);
1500
1501 uart_resume_port(&serial_omap_reg, &up->port);
1502
1503 return 0;
1504 }
1505 #else
1506 #define serial_omap_prepare NULL
1507 #define serial_omap_complete NULL
1508 #endif /* CONFIG_PM_SLEEP */
1509
1510 static void omap_serial_fill_features_erratas(struct uart_omap_port *up)
1511 {
1512 u32 mvr, scheme;
1513 u16 revision, major, minor;
1514
1515 mvr = readl(up->port.membase + (UART_OMAP_MVER << up->port.regshift));
1516
1517 /* Check revision register scheme */
1518 scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT;
1519
1520 switch (scheme) {
1521 case 0: /* Legacy Scheme: OMAP2/3 */
1522 /* MINOR_REV[0:4], MAJOR_REV[4:7] */
1523 major = (mvr & OMAP_UART_LEGACY_MVR_MAJ_MASK) >>
1524 OMAP_UART_LEGACY_MVR_MAJ_SHIFT;
1525 minor = (mvr & OMAP_UART_LEGACY_MVR_MIN_MASK);
1526 break;
1527 case 1:
1528 /* New Scheme: OMAP4+ */
1529 /* MINOR_REV[0:5], MAJOR_REV[8:10] */
1530 major = (mvr & OMAP_UART_MVR_MAJ_MASK) >>
1531 OMAP_UART_MVR_MAJ_SHIFT;
1532 minor = (mvr & OMAP_UART_MVR_MIN_MASK);
1533 break;
1534 default:
1535 dev_warn(up->dev,
1536 "Unknown %s revision, defaulting to highest\n",
1537 up->name);
1538 /* highest possible revision */
1539 major = 0xff;
1540 minor = 0xff;
1541 }
1542
1543 /* normalize revision for the driver */
1544 revision = UART_BUILD_REVISION(major, minor);
1545
1546 switch (revision) {
1547 case OMAP_UART_REV_46:
1548 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1549 UART_ERRATA_i291_DMA_FORCEIDLE);
1550 break;
1551 case OMAP_UART_REV_52:
1552 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1553 UART_ERRATA_i291_DMA_FORCEIDLE);
1554 up->features |= OMAP_UART_WER_HAS_TX_WAKEUP;
1555 break;
1556 case OMAP_UART_REV_63:
1557 up->errata |= UART_ERRATA_i202_MDR1_ACCESS;
1558 up->features |= OMAP_UART_WER_HAS_TX_WAKEUP;
1559 break;
1560 default:
1561 break;
1562 }
1563 }
1564
1565 static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev)
1566 {
1567 struct omap_uart_port_info *omap_up_info;
1568
1569 omap_up_info = devm_kzalloc(dev, sizeof(*omap_up_info), GFP_KERNEL);
1570 if (!omap_up_info)
1571 return NULL; /* out of memory */
1572
1573 of_property_read_u32(dev->of_node, "clock-frequency",
1574 &omap_up_info->uartclk);
1575 return omap_up_info;
1576 }
1577
1578 static int serial_omap_probe_rs485(struct uart_omap_port *up,
1579 struct device_node *np)
1580 {
1581 struct serial_rs485 *rs485conf = &up->rs485;
1582 u32 rs485_delay[2];
1583 enum of_gpio_flags flags;
1584 int ret;
1585
1586 rs485conf->flags = 0;
1587 up->rts_gpio = -EINVAL;
1588
1589 if (!np)
1590 return 0;
1591
1592 if (of_property_read_bool(np, "rs485-rts-active-high"))
1593 rs485conf->flags |= SER_RS485_RTS_ON_SEND;
1594 else
1595 rs485conf->flags |= SER_RS485_RTS_AFTER_SEND;
1596
1597 /* check for tx enable gpio */
1598 up->rts_gpio = of_get_named_gpio_flags(np, "rts-gpio", 0, &flags);
1599 if (gpio_is_valid(up->rts_gpio)) {
1600 ret = gpio_request(up->rts_gpio, "omap-serial");
1601 if (ret < 0)
1602 return ret;
1603 ret = gpio_direction_output(up->rts_gpio,
1604 flags & SER_RS485_RTS_AFTER_SEND);
1605 if (ret < 0)
1606 return ret;
1607 } else
1608 up->rts_gpio = -EINVAL;
1609
1610 if (of_property_read_u32_array(np, "rs485-rts-delay",
1611 rs485_delay, 2) == 0) {
1612 rs485conf->delay_rts_before_send = rs485_delay[0];
1613 rs485conf->delay_rts_after_send = rs485_delay[1];
1614 }
1615
1616 if (of_property_read_bool(np, "rs485-rx-during-tx"))
1617 rs485conf->flags |= SER_RS485_RX_DURING_TX;
1618
1619 if (of_property_read_bool(np, "linux,rs485-enabled-at-boot-time"))
1620 rs485conf->flags |= SER_RS485_ENABLED;
1621
1622 return 0;
1623 }
1624
1625 static int serial_omap_probe(struct platform_device *pdev)
1626 {
1627 struct uart_omap_port *up;
1628 struct resource *mem, *irq;
1629 struct omap_uart_port_info *omap_up_info = dev_get_platdata(&pdev->dev);
1630 int ret, uartirq = 0, wakeirq = 0;
1631
1632 /* The optional wakeirq may be specified in the board dts file */
1633 if (pdev->dev.of_node) {
1634 uartirq = irq_of_parse_and_map(pdev->dev.of_node, 0);
1635 if (!uartirq)
1636 return -EPROBE_DEFER;
1637 wakeirq = irq_of_parse_and_map(pdev->dev.of_node, 1);
1638 omap_up_info = of_get_uart_port_info(&pdev->dev);
1639 pdev->dev.platform_data = omap_up_info;
1640 } else {
1641 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1642 if (!irq) {
1643 dev_err(&pdev->dev, "no irq resource?\n");
1644 return -ENODEV;
1645 }
1646 uartirq = irq->start;
1647 }
1648
1649 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1650 if (!mem) {
1651 dev_err(&pdev->dev, "no mem resource?\n");
1652 return -ENODEV;
1653 }
1654
1655 if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem),
1656 pdev->dev.driver->name)) {
1657 dev_err(&pdev->dev, "memory region already claimed\n");
1658 return -EBUSY;
1659 }
1660
1661 if (gpio_is_valid(omap_up_info->DTR_gpio) &&
1662 omap_up_info->DTR_present) {
1663 ret = gpio_request(omap_up_info->DTR_gpio, "omap-serial");
1664 if (ret < 0)
1665 return ret;
1666 ret = gpio_direction_output(omap_up_info->DTR_gpio,
1667 omap_up_info->DTR_inverted);
1668 if (ret < 0)
1669 return ret;
1670 }
1671
1672 up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL);
1673 if (!up)
1674 return -ENOMEM;
1675
1676 if (gpio_is_valid(omap_up_info->DTR_gpio) &&
1677 omap_up_info->DTR_present) {
1678 up->DTR_gpio = omap_up_info->DTR_gpio;
1679 up->DTR_inverted = omap_up_info->DTR_inverted;
1680 } else
1681 up->DTR_gpio = -EINVAL;
1682 up->DTR_active = 0;
1683
1684 up->dev = &pdev->dev;
1685 up->port.dev = &pdev->dev;
1686 up->port.type = PORT_OMAP;
1687 up->port.iotype = UPIO_MEM;
1688 up->port.irq = uartirq;
1689 up->wakeirq = wakeirq;
1690
1691 up->port.regshift = 2;
1692 up->port.fifosize = 64;
1693 up->port.ops = &serial_omap_pops;
1694
1695 if (pdev->dev.of_node)
1696 up->port.line = of_alias_get_id(pdev->dev.of_node, "serial");
1697 else
1698 up->port.line = pdev->id;
1699
1700 if (up->port.line < 0) {
1701 dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n",
1702 up->port.line);
1703 ret = -ENODEV;
1704 goto err_port_line;
1705 }
1706
1707 ret = serial_omap_probe_rs485(up, pdev->dev.of_node);
1708 if (ret < 0)
1709 goto err_rs485;
1710
1711 sprintf(up->name, "OMAP UART%d", up->port.line);
1712 up->port.mapbase = mem->start;
1713 up->port.membase = devm_ioremap(&pdev->dev, mem->start,
1714 resource_size(mem));
1715 if (!up->port.membase) {
1716 dev_err(&pdev->dev, "can't ioremap UART\n");
1717 ret = -ENOMEM;
1718 goto err_ioremap;
1719 }
1720
1721 up->port.flags = omap_up_info->flags;
1722 up->port.uartclk = omap_up_info->uartclk;
1723 if (!up->port.uartclk) {
1724 up->port.uartclk = DEFAULT_CLK_SPEED;
1725 dev_warn(&pdev->dev,
1726 "No clock speed specified: using default: %d\n",
1727 DEFAULT_CLK_SPEED);
1728 }
1729
1730 up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1731 up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1732 pm_qos_add_request(&up->pm_qos_request,
1733 PM_QOS_CPU_DMA_LATENCY, up->latency);
1734 serial_omap_uart_wq = create_singlethread_workqueue(up->name);
1735 INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
1736
1737 platform_set_drvdata(pdev, up);
1738 if (omap_up_info->autosuspend_timeout == 0)
1739 omap_up_info->autosuspend_timeout = -1;
1740 device_init_wakeup(up->dev, true);
1741 pm_runtime_use_autosuspend(&pdev->dev);
1742 pm_runtime_set_autosuspend_delay(&pdev->dev,
1743 omap_up_info->autosuspend_timeout);
1744
1745 pm_runtime_irq_safe(&pdev->dev);
1746 pm_runtime_enable(&pdev->dev);
1747
1748 pm_runtime_get_sync(&pdev->dev);
1749
1750 omap_serial_fill_features_erratas(up);
1751
1752 ui[up->port.line] = up;
1753 serial_omap_add_console_port(up);
1754
1755 ret = uart_add_one_port(&serial_omap_reg, &up->port);
1756 if (ret != 0)
1757 goto err_add_port;
1758
1759 pm_runtime_mark_last_busy(up->dev);
1760 pm_runtime_put_autosuspend(up->dev);
1761 return 0;
1762
1763 err_add_port:
1764 pm_runtime_put(&pdev->dev);
1765 pm_runtime_disable(&pdev->dev);
1766 err_ioremap:
1767 err_rs485:
1768 err_port_line:
1769 dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n",
1770 pdev->id, __func__, ret);
1771 return ret;
1772 }
1773
1774 static int serial_omap_remove(struct platform_device *dev)
1775 {
1776 struct uart_omap_port *up = platform_get_drvdata(dev);
1777
1778 pm_runtime_put_sync(up->dev);
1779 pm_runtime_disable(up->dev);
1780 uart_remove_one_port(&serial_omap_reg, &up->port);
1781 pm_qos_remove_request(&up->pm_qos_request);
1782
1783 return 0;
1784 }
1785
1786 /*
1787 * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460)
1788 * The access to uart register after MDR1 Access
1789 * causes UART to corrupt data.
1790 *
1791 * Need a delay =
1792 * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS)
1793 * give 10 times as much
1794 */
1795 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1)
1796 {
1797 u8 timeout = 255;
1798
1799 serial_out(up, UART_OMAP_MDR1, mdr1);
1800 udelay(2);
1801 serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT |
1802 UART_FCR_CLEAR_RCVR);
1803 /*
1804 * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and
1805 * TX_FIFO_E bit is 1.
1806 */
1807 while (UART_LSR_THRE != (serial_in(up, UART_LSR) &
1808 (UART_LSR_THRE | UART_LSR_DR))) {
1809 timeout--;
1810 if (!timeout) {
1811 /* Should *never* happen. we warn and carry on */
1812 dev_crit(up->dev, "Errata i202: timedout %x\n",
1813 serial_in(up, UART_LSR));
1814 break;
1815 }
1816 udelay(1);
1817 }
1818 }
1819
1820 #ifdef CONFIG_PM_RUNTIME
1821 static void serial_omap_restore_context(struct uart_omap_port *up)
1822 {
1823 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1824 serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE);
1825 else
1826 serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE);
1827
1828 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1829 serial_out(up, UART_EFR, UART_EFR_ECB);
1830 serial_out(up, UART_LCR, 0x0); /* Operational mode */
1831 serial_out(up, UART_IER, 0x0);
1832 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1833 serial_out(up, UART_DLL, up->dll);
1834 serial_out(up, UART_DLM, up->dlh);
1835 serial_out(up, UART_LCR, 0x0); /* Operational mode */
1836 serial_out(up, UART_IER, up->ier);
1837 serial_out(up, UART_FCR, up->fcr);
1838 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
1839 serial_out(up, UART_MCR, up->mcr);
1840 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1841 serial_out(up, UART_OMAP_SCR, up->scr);
1842 serial_out(up, UART_EFR, up->efr);
1843 serial_out(up, UART_LCR, up->lcr);
1844 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1845 serial_omap_mdr1_errataset(up, up->mdr1);
1846 else
1847 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1848 serial_out(up, UART_OMAP_WER, up->wer);
1849 }
1850
1851 static int serial_omap_runtime_suspend(struct device *dev)
1852 {
1853 struct uart_omap_port *up = dev_get_drvdata(dev);
1854
1855 if (!up)
1856 return -EINVAL;
1857
1858 /*
1859 * When using 'no_console_suspend', the console UART must not be
1860 * suspended. Since driver suspend is managed by runtime suspend,
1861 * preventing runtime suspend (by returning error) will keep device
1862 * active during suspend.
1863 */
1864 if (up->is_suspending && !console_suspend_enabled &&
1865 uart_console(&up->port))
1866 return -EBUSY;
1867
1868 up->context_loss_cnt = serial_omap_get_context_loss_count(up);
1869
1870 if (device_may_wakeup(dev)) {
1871 if (!up->wakeups_enabled) {
1872 serial_omap_enable_wakeup(up, true);
1873 up->wakeups_enabled = true;
1874 }
1875 } else {
1876 if (up->wakeups_enabled) {
1877 serial_omap_enable_wakeup(up, false);
1878 up->wakeups_enabled = false;
1879 }
1880 }
1881
1882 up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1883 schedule_work(&up->qos_work);
1884
1885 return 0;
1886 }
1887
1888 static int serial_omap_runtime_resume(struct device *dev)
1889 {
1890 struct uart_omap_port *up = dev_get_drvdata(dev);
1891
1892 int loss_cnt = serial_omap_get_context_loss_count(up);
1893
1894 if (loss_cnt < 0) {
1895 dev_dbg(dev, "serial_omap_get_context_loss_count failed : %d\n",
1896 loss_cnt);
1897 serial_omap_restore_context(up);
1898 } else if (up->context_loss_cnt != loss_cnt) {
1899 serial_omap_restore_context(up);
1900 }
1901 up->latency = up->calc_latency;
1902 schedule_work(&up->qos_work);
1903
1904 return 0;
1905 }
1906 #endif
1907
1908 static const struct dev_pm_ops serial_omap_dev_pm_ops = {
1909 SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume)
1910 SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend,
1911 serial_omap_runtime_resume, NULL)
1912 .prepare = serial_omap_prepare,
1913 .complete = serial_omap_complete,
1914 };
1915
1916 #if defined(CONFIG_OF)
1917 static const struct of_device_id omap_serial_of_match[] = {
1918 { .compatible = "ti,omap2-uart" },
1919 { .compatible = "ti,omap3-uart" },
1920 { .compatible = "ti,omap4-uart" },
1921 {},
1922 };
1923 MODULE_DEVICE_TABLE(of, omap_serial_of_match);
1924 #endif
1925
1926 static struct platform_driver serial_omap_driver = {
1927 .probe = serial_omap_probe,
1928 .remove = serial_omap_remove,
1929 .driver = {
1930 .name = DRIVER_NAME,
1931 .pm = &serial_omap_dev_pm_ops,
1932 .of_match_table = of_match_ptr(omap_serial_of_match),
1933 },
1934 };
1935
1936 static int __init serial_omap_init(void)
1937 {
1938 int ret;
1939
1940 ret = uart_register_driver(&serial_omap_reg);
1941 if (ret != 0)
1942 return ret;
1943 ret = platform_driver_register(&serial_omap_driver);
1944 if (ret != 0)
1945 uart_unregister_driver(&serial_omap_reg);
1946 return ret;
1947 }
1948
1949 static void __exit serial_omap_exit(void)
1950 {
1951 platform_driver_unregister(&serial_omap_driver);
1952 uart_unregister_driver(&serial_omap_reg);
1953 }
1954
1955 module_init(serial_omap_init);
1956 module_exit(serial_omap_exit);
1957
1958 MODULE_DESCRIPTION("OMAP High Speed UART driver");
1959 MODULE_LICENSE("GPL");
1960 MODULE_AUTHOR("Texas Instruments Inc");
Linux with added FPC-III support