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Merge branch 'for-linus-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/mason...
[deliverable/linux.git] / drivers / tty / serial / omap-serial.c
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/pm_wakeirq.h>
42 #include <linux/of.h>
43 #include <linux/of_irq.h>
44 #include <linux/gpio.h>
45 #include <linux/of_gpio.h>
46 #include <linux/platform_data/serial-omap.h>
47
48 #include <dt-bindings/gpio/gpio.h>
49
50 #define OMAP_MAX_HSUART_PORTS 10
51
52 #define UART_BUILD_REVISION(x, y) (((x) << 8) | (y))
53
54 #define OMAP_UART_REV_42 0x0402
55 #define OMAP_UART_REV_46 0x0406
56 #define OMAP_UART_REV_52 0x0502
57 #define OMAP_UART_REV_63 0x0603
58
59 #define OMAP_UART_TX_WAKEUP_EN BIT(7)
60
61 /* Feature flags */
62 #define OMAP_UART_WER_HAS_TX_WAKEUP BIT(0)
63
64 #define UART_ERRATA_i202_MDR1_ACCESS BIT(0)
65 #define UART_ERRATA_i291_DMA_FORCEIDLE BIT(1)
66
67 #define DEFAULT_CLK_SPEED 48000000 /* 48Mhz */
68
69 /* SCR register bitmasks */
70 #define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK (1 << 7)
71 #define OMAP_UART_SCR_TX_TRIG_GRANU1_MASK (1 << 6)
72 #define OMAP_UART_SCR_TX_EMPTY (1 << 3)
73
74 /* FCR register bitmasks */
75 #define OMAP_UART_FCR_RX_FIFO_TRIG_MASK (0x3 << 6)
76 #define OMAP_UART_FCR_TX_FIFO_TRIG_MASK (0x3 << 4)
77
78 /* MVR register bitmasks */
79 #define OMAP_UART_MVR_SCHEME_SHIFT 30
80
81 #define OMAP_UART_LEGACY_MVR_MAJ_MASK 0xf0
82 #define OMAP_UART_LEGACY_MVR_MAJ_SHIFT 4
83 #define OMAP_UART_LEGACY_MVR_MIN_MASK 0x0f
84
85 #define OMAP_UART_MVR_MAJ_MASK 0x700
86 #define OMAP_UART_MVR_MAJ_SHIFT 8
87 #define OMAP_UART_MVR_MIN_MASK 0x3f
88
89 #define OMAP_UART_DMA_CH_FREE -1
90
91 #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
92 #define OMAP_MODE13X_SPEED 230400
93
94 /* WER = 0x7F
95 * Enable module level wakeup in WER reg
96 */
97 #define OMAP_UART_WER_MOD_WKUP 0x7F
98
99 /* Enable XON/XOFF flow control on output */
100 #define OMAP_UART_SW_TX 0x08
101
102 /* Enable XON/XOFF flow control on input */
103 #define OMAP_UART_SW_RX 0x02
104
105 #define OMAP_UART_SW_CLR 0xF0
106
107 #define OMAP_UART_TCR_TRIG 0x0F
108
109 struct uart_omap_dma {
110 u8 uart_dma_tx;
111 u8 uart_dma_rx;
112 int rx_dma_channel;
113 int tx_dma_channel;
114 dma_addr_t rx_buf_dma_phys;
115 dma_addr_t tx_buf_dma_phys;
116 unsigned int uart_base;
117 /*
118 * Buffer for rx dma. It is not required for tx because the buffer
119 * comes from port structure.
120 */
121 unsigned char *rx_buf;
122 unsigned int prev_rx_dma_pos;
123 int tx_buf_size;
124 int tx_dma_used;
125 int rx_dma_used;
126 spinlock_t tx_lock;
127 spinlock_t rx_lock;
128 /* timer to poll activity on rx dma */
129 struct timer_list rx_timer;
130 unsigned int rx_buf_size;
131 unsigned int rx_poll_rate;
132 unsigned int rx_timeout;
133 };
134
135 struct uart_omap_port {
136 struct uart_port port;
137 struct uart_omap_dma uart_dma;
138 struct device *dev;
139 int wakeirq;
140
141 unsigned char ier;
142 unsigned char lcr;
143 unsigned char mcr;
144 unsigned char fcr;
145 unsigned char efr;
146 unsigned char dll;
147 unsigned char dlh;
148 unsigned char mdr1;
149 unsigned char scr;
150 unsigned char wer;
151
152 int use_dma;
153 /*
154 * Some bits in registers are cleared on a read, so they must
155 * be saved whenever the register is read, but the bits will not
156 * be immediately processed.
157 */
158 unsigned int lsr_break_flag;
159 unsigned char msr_saved_flags;
160 char name[20];
161 unsigned long port_activity;
162 int context_loss_cnt;
163 u32 errata;
164 u32 features;
165
166 int rts_gpio;
167
168 struct pm_qos_request pm_qos_request;
169 u32 latency;
170 u32 calc_latency;
171 struct work_struct qos_work;
172 bool is_suspending;
173 };
174
175 #define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port)))
176
177 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
178
179 /* Forward declaration of functions */
180 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1);
181
182 static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
183 {
184 offset <<= up->port.regshift;
185 return readw(up->port.membase + offset);
186 }
187
188 static inline void serial_out(struct uart_omap_port *up, int offset, int value)
189 {
190 offset <<= up->port.regshift;
191 writew(value, up->port.membase + offset);
192 }
193
194 static inline void serial_omap_clear_fifos(struct uart_omap_port *up)
195 {
196 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
197 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
198 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
199 serial_out(up, UART_FCR, 0);
200 }
201
202 #ifdef CONFIG_PM
203 static int serial_omap_get_context_loss_count(struct uart_omap_port *up)
204 {
205 struct omap_uart_port_info *pdata = dev_get_platdata(up->dev);
206
207 if (!pdata || !pdata->get_context_loss_count)
208 return -EINVAL;
209
210 return pdata->get_context_loss_count(up->dev);
211 }
212
213 /* REVISIT: Remove this when omap3 boots in device tree only mode */
214 static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable)
215 {
216 struct omap_uart_port_info *pdata = dev_get_platdata(up->dev);
217
218 if (!pdata || !pdata->enable_wakeup)
219 return;
220
221 pdata->enable_wakeup(up->dev, enable);
222 }
223 #endif /* CONFIG_PM */
224
225 /*
226 * Calculate the absolute difference between the desired and actual baud
227 * rate for the given mode.
228 */
229 static inline int calculate_baud_abs_diff(struct uart_port *port,
230 unsigned int baud, unsigned int mode)
231 {
232 unsigned int n = port->uartclk / (mode * baud);
233 int abs_diff;
234
235 if (n == 0)
236 n = 1;
237
238 abs_diff = baud - (port->uartclk / (mode * n));
239 if (abs_diff < 0)
240 abs_diff = -abs_diff;
241
242 return abs_diff;
243 }
244
245 /*
246 * serial_omap_baud_is_mode16 - check if baud rate is MODE16X
247 * @port: uart port info
248 * @baud: baudrate for which mode needs to be determined
249 *
250 * Returns true if baud rate is MODE16X and false if MODE13X
251 * Original table in OMAP TRM named "UART Mode Baud Rates, Divisor Values,
252 * and Error Rates" determines modes not for all common baud rates.
253 * E.g. for 1000000 baud rate mode must be 16x, but according to that
254 * table it's determined as 13x.
255 */
256 static bool
257 serial_omap_baud_is_mode16(struct uart_port *port, unsigned int baud)
258 {
259 int abs_diff_13 = calculate_baud_abs_diff(port, baud, 13);
260 int abs_diff_16 = calculate_baud_abs_diff(port, baud, 16);
261
262 return (abs_diff_13 >= abs_diff_16);
263 }
264
265 /*
266 * serial_omap_get_divisor - calculate divisor value
267 * @port: uart port info
268 * @baud: baudrate for which divisor needs to be calculated.
269 */
270 static unsigned int
271 serial_omap_get_divisor(struct uart_port *port, unsigned int baud)
272 {
273 unsigned int mode;
274
275 if (!serial_omap_baud_is_mode16(port, baud))
276 mode = 13;
277 else
278 mode = 16;
279 return port->uartclk/(mode * baud);
280 }
281
282 static void serial_omap_enable_ms(struct uart_port *port)
283 {
284 struct uart_omap_port *up = to_uart_omap_port(port);
285
286 dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line);
287
288 pm_runtime_get_sync(up->dev);
289 up->ier |= UART_IER_MSI;
290 serial_out(up, UART_IER, up->ier);
291 pm_runtime_mark_last_busy(up->dev);
292 pm_runtime_put_autosuspend(up->dev);
293 }
294
295 static void serial_omap_stop_tx(struct uart_port *port)
296 {
297 struct uart_omap_port *up = to_uart_omap_port(port);
298 int res;
299
300 pm_runtime_get_sync(up->dev);
301
302 /* Handle RS-485 */
303 if (port->rs485.flags & SER_RS485_ENABLED) {
304 if (up->scr & OMAP_UART_SCR_TX_EMPTY) {
305 /* THR interrupt is fired when both TX FIFO and TX
306 * shift register are empty. This means there's nothing
307 * left to transmit now, so make sure the THR interrupt
308 * is fired when TX FIFO is below the trigger level,
309 * disable THR interrupts and toggle the RS-485 GPIO
310 * data direction pin if needed.
311 */
312 up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
313 serial_out(up, UART_OMAP_SCR, up->scr);
314 res = (port->rs485.flags & SER_RS485_RTS_AFTER_SEND) ?
315 1 : 0;
316 if (gpio_get_value(up->rts_gpio) != res) {
317 if (port->rs485.delay_rts_after_send > 0)
318 mdelay(
319 port->rs485.delay_rts_after_send);
320 gpio_set_value(up->rts_gpio, res);
321 }
322 } else {
323 /* We're asked to stop, but there's still stuff in the
324 * UART FIFO, so make sure the THR interrupt is fired
325 * when both TX FIFO and TX shift register are empty.
326 * The next THR interrupt (if no transmission is started
327 * in the meantime) will indicate the end of a
328 * transmission. Therefore we _don't_ disable THR
329 * interrupts in this situation.
330 */
331 up->scr |= OMAP_UART_SCR_TX_EMPTY;
332 serial_out(up, UART_OMAP_SCR, up->scr);
333 return;
334 }
335 }
336
337 if (up->ier & UART_IER_THRI) {
338 up->ier &= ~UART_IER_THRI;
339 serial_out(up, UART_IER, up->ier);
340 }
341
342 if ((port->rs485.flags & SER_RS485_ENABLED) &&
343 !(port->rs485.flags & SER_RS485_RX_DURING_TX)) {
344 /*
345 * Empty the RX FIFO, we are not interested in anything
346 * received during the half-duplex transmission.
347 */
348 serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_RCVR);
349 /* Re-enable RX interrupts */
350 up->ier |= UART_IER_RLSI | UART_IER_RDI;
351 up->port.read_status_mask |= UART_LSR_DR;
352 serial_out(up, UART_IER, up->ier);
353 }
354
355 pm_runtime_mark_last_busy(up->dev);
356 pm_runtime_put_autosuspend(up->dev);
357 }
358
359 static void serial_omap_stop_rx(struct uart_port *port)
360 {
361 struct uart_omap_port *up = to_uart_omap_port(port);
362
363 pm_runtime_get_sync(up->dev);
364 up->ier &= ~(UART_IER_RLSI | UART_IER_RDI);
365 up->port.read_status_mask &= ~UART_LSR_DR;
366 serial_out(up, UART_IER, up->ier);
367 pm_runtime_mark_last_busy(up->dev);
368 pm_runtime_put_autosuspend(up->dev);
369 }
370
371 static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
372 {
373 struct circ_buf *xmit = &up->port.state->xmit;
374 int count;
375
376 if (up->port.x_char) {
377 serial_out(up, UART_TX, up->port.x_char);
378 up->port.icount.tx++;
379 up->port.x_char = 0;
380 return;
381 }
382 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
383 serial_omap_stop_tx(&up->port);
384 return;
385 }
386 count = up->port.fifosize / 4;
387 do {
388 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
389 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
390 up->port.icount.tx++;
391 if (uart_circ_empty(xmit))
392 break;
393 } while (--count > 0);
394
395 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
396 uart_write_wakeup(&up->port);
397
398 if (uart_circ_empty(xmit))
399 serial_omap_stop_tx(&up->port);
400 }
401
402 static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
403 {
404 if (!(up->ier & UART_IER_THRI)) {
405 up->ier |= UART_IER_THRI;
406 serial_out(up, UART_IER, up->ier);
407 }
408 }
409
410 static void serial_omap_start_tx(struct uart_port *port)
411 {
412 struct uart_omap_port *up = to_uart_omap_port(port);
413 int res;
414
415 pm_runtime_get_sync(up->dev);
416
417 /* Handle RS-485 */
418 if (port->rs485.flags & SER_RS485_ENABLED) {
419 /* Fire THR interrupts when FIFO is below trigger level */
420 up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
421 serial_out(up, UART_OMAP_SCR, up->scr);
422
423 /* if rts not already enabled */
424 res = (port->rs485.flags & SER_RS485_RTS_ON_SEND) ? 1 : 0;
425 if (gpio_get_value(up->rts_gpio) != res) {
426 gpio_set_value(up->rts_gpio, res);
427 if (port->rs485.delay_rts_before_send > 0)
428 mdelay(port->rs485.delay_rts_before_send);
429 }
430 }
431
432 if ((port->rs485.flags & SER_RS485_ENABLED) &&
433 !(port->rs485.flags & SER_RS485_RX_DURING_TX))
434 serial_omap_stop_rx(port);
435
436 serial_omap_enable_ier_thri(up);
437 pm_runtime_mark_last_busy(up->dev);
438 pm_runtime_put_autosuspend(up->dev);
439 }
440
441 static void serial_omap_throttle(struct uart_port *port)
442 {
443 struct uart_omap_port *up = to_uart_omap_port(port);
444 unsigned long flags;
445
446 pm_runtime_get_sync(up->dev);
447 spin_lock_irqsave(&up->port.lock, flags);
448 up->ier &= ~(UART_IER_RLSI | UART_IER_RDI);
449 serial_out(up, UART_IER, up->ier);
450 spin_unlock_irqrestore(&up->port.lock, flags);
451 pm_runtime_mark_last_busy(up->dev);
452 pm_runtime_put_autosuspend(up->dev);
453 }
454
455 static void serial_omap_unthrottle(struct uart_port *port)
456 {
457 struct uart_omap_port *up = to_uart_omap_port(port);
458 unsigned long flags;
459
460 pm_runtime_get_sync(up->dev);
461 spin_lock_irqsave(&up->port.lock, flags);
462 up->ier |= UART_IER_RLSI | UART_IER_RDI;
463 serial_out(up, UART_IER, up->ier);
464 spin_unlock_irqrestore(&up->port.lock, flags);
465 pm_runtime_mark_last_busy(up->dev);
466 pm_runtime_put_autosuspend(up->dev);
467 }
468
469 static unsigned int check_modem_status(struct uart_omap_port *up)
470 {
471 unsigned int status;
472
473 status = serial_in(up, UART_MSR);
474 status |= up->msr_saved_flags;
475 up->msr_saved_flags = 0;
476 if ((status & UART_MSR_ANY_DELTA) == 0)
477 return status;
478
479 if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
480 up->port.state != NULL) {
481 if (status & UART_MSR_TERI)
482 up->port.icount.rng++;
483 if (status & UART_MSR_DDSR)
484 up->port.icount.dsr++;
485 if (status & UART_MSR_DDCD)
486 uart_handle_dcd_change
487 (&up->port, status & UART_MSR_DCD);
488 if (status & UART_MSR_DCTS)
489 uart_handle_cts_change
490 (&up->port, status & UART_MSR_CTS);
491 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
492 }
493
494 return status;
495 }
496
497 static void serial_omap_rlsi(struct uart_omap_port *up, unsigned int lsr)
498 {
499 unsigned int flag;
500 unsigned char ch = 0;
501
502 if (likely(lsr & UART_LSR_DR))
503 ch = serial_in(up, UART_RX);
504
505 up->port.icount.rx++;
506 flag = TTY_NORMAL;
507
508 if (lsr & UART_LSR_BI) {
509 flag = TTY_BREAK;
510 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
511 up->port.icount.brk++;
512 /*
513 * We do the SysRQ and SAK checking
514 * here because otherwise the break
515 * may get masked by ignore_status_mask
516 * or read_status_mask.
517 */
518 if (uart_handle_break(&up->port))
519 return;
520
521 }
522
523 if (lsr & UART_LSR_PE) {
524 flag = TTY_PARITY;
525 up->port.icount.parity++;
526 }
527
528 if (lsr & UART_LSR_FE) {
529 flag = TTY_FRAME;
530 up->port.icount.frame++;
531 }
532
533 if (lsr & UART_LSR_OE)
534 up->port.icount.overrun++;
535
536 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
537 if (up->port.line == up->port.cons->index) {
538 /* Recover the break flag from console xmit */
539 lsr |= up->lsr_break_flag;
540 }
541 #endif
542 uart_insert_char(&up->port, lsr, UART_LSR_OE, 0, flag);
543 }
544
545 static void serial_omap_rdi(struct uart_omap_port *up, unsigned int lsr)
546 {
547 unsigned char ch = 0;
548 unsigned int flag;
549
550 if (!(lsr & UART_LSR_DR))
551 return;
552
553 ch = serial_in(up, UART_RX);
554 flag = TTY_NORMAL;
555 up->port.icount.rx++;
556
557 if (uart_handle_sysrq_char(&up->port, ch))
558 return;
559
560 uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
561 }
562
563 /**
564 * serial_omap_irq() - This handles the interrupt from one port
565 * @irq: uart port irq number
566 * @dev_id: uart port info
567 */
568 static irqreturn_t serial_omap_irq(int irq, void *dev_id)
569 {
570 struct uart_omap_port *up = dev_id;
571 unsigned int iir, lsr;
572 unsigned int type;
573 irqreturn_t ret = IRQ_NONE;
574 int max_count = 256;
575
576 spin_lock(&up->port.lock);
577 pm_runtime_get_sync(up->dev);
578
579 do {
580 iir = serial_in(up, UART_IIR);
581 if (iir & UART_IIR_NO_INT)
582 break;
583
584 ret = IRQ_HANDLED;
585 lsr = serial_in(up, UART_LSR);
586
587 /* extract IRQ type from IIR register */
588 type = iir & 0x3e;
589
590 switch (type) {
591 case UART_IIR_MSI:
592 check_modem_status(up);
593 break;
594 case UART_IIR_THRI:
595 transmit_chars(up, lsr);
596 break;
597 case UART_IIR_RX_TIMEOUT:
598 /* FALLTHROUGH */
599 case UART_IIR_RDI:
600 serial_omap_rdi(up, lsr);
601 break;
602 case UART_IIR_RLSI:
603 serial_omap_rlsi(up, lsr);
604 break;
605 case UART_IIR_CTS_RTS_DSR:
606 /* simply try again */
607 break;
608 case UART_IIR_XOFF:
609 /* FALLTHROUGH */
610 default:
611 break;
612 }
613 } while (!(iir & UART_IIR_NO_INT) && max_count--);
614
615 spin_unlock(&up->port.lock);
616
617 tty_flip_buffer_push(&up->port.state->port);
618
619 pm_runtime_mark_last_busy(up->dev);
620 pm_runtime_put_autosuspend(up->dev);
621 up->port_activity = jiffies;
622
623 return ret;
624 }
625
626 static unsigned int serial_omap_tx_empty(struct uart_port *port)
627 {
628 struct uart_omap_port *up = to_uart_omap_port(port);
629 unsigned long flags = 0;
630 unsigned int ret = 0;
631
632 pm_runtime_get_sync(up->dev);
633 dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->port.line);
634 spin_lock_irqsave(&up->port.lock, flags);
635 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
636 spin_unlock_irqrestore(&up->port.lock, flags);
637 pm_runtime_mark_last_busy(up->dev);
638 pm_runtime_put_autosuspend(up->dev);
639 return ret;
640 }
641
642 static unsigned int serial_omap_get_mctrl(struct uart_port *port)
643 {
644 struct uart_omap_port *up = to_uart_omap_port(port);
645 unsigned int status;
646 unsigned int ret = 0;
647
648 pm_runtime_get_sync(up->dev);
649 status = check_modem_status(up);
650 pm_runtime_mark_last_busy(up->dev);
651 pm_runtime_put_autosuspend(up->dev);
652
653 dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->port.line);
654
655 if (status & UART_MSR_DCD)
656 ret |= TIOCM_CAR;
657 if (status & UART_MSR_RI)
658 ret |= TIOCM_RNG;
659 if (status & UART_MSR_DSR)
660 ret |= TIOCM_DSR;
661 if (status & UART_MSR_CTS)
662 ret |= TIOCM_CTS;
663 return ret;
664 }
665
666 static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
667 {
668 struct uart_omap_port *up = to_uart_omap_port(port);
669 unsigned char mcr = 0, old_mcr, lcr;
670
671 dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->port.line);
672 if (mctrl & TIOCM_RTS)
673 mcr |= UART_MCR_RTS;
674 if (mctrl & TIOCM_DTR)
675 mcr |= UART_MCR_DTR;
676 if (mctrl & TIOCM_OUT1)
677 mcr |= UART_MCR_OUT1;
678 if (mctrl & TIOCM_OUT2)
679 mcr |= UART_MCR_OUT2;
680 if (mctrl & TIOCM_LOOP)
681 mcr |= UART_MCR_LOOP;
682
683 pm_runtime_get_sync(up->dev);
684 old_mcr = serial_in(up, UART_MCR);
685 old_mcr &= ~(UART_MCR_LOOP | UART_MCR_OUT2 | UART_MCR_OUT1 |
686 UART_MCR_DTR | UART_MCR_RTS);
687 up->mcr = old_mcr | mcr;
688 serial_out(up, UART_MCR, up->mcr);
689
690 /* Turn off autoRTS if RTS is lowered; restore autoRTS if RTS raised */
691 lcr = serial_in(up, UART_LCR);
692 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
693 if ((mctrl & TIOCM_RTS) && (port->status & UPSTAT_AUTORTS))
694 up->efr |= UART_EFR_RTS;
695 else
696 up->efr &= UART_EFR_RTS;
697 serial_out(up, UART_EFR, up->efr);
698 serial_out(up, UART_LCR, lcr);
699
700 pm_runtime_mark_last_busy(up->dev);
701 pm_runtime_put_autosuspend(up->dev);
702 }
703
704 static void serial_omap_break_ctl(struct uart_port *port, int break_state)
705 {
706 struct uart_omap_port *up = to_uart_omap_port(port);
707 unsigned long flags = 0;
708
709 dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line);
710 pm_runtime_get_sync(up->dev);
711 spin_lock_irqsave(&up->port.lock, flags);
712 if (break_state == -1)
713 up->lcr |= UART_LCR_SBC;
714 else
715 up->lcr &= ~UART_LCR_SBC;
716 serial_out(up, UART_LCR, up->lcr);
717 spin_unlock_irqrestore(&up->port.lock, flags);
718 pm_runtime_mark_last_busy(up->dev);
719 pm_runtime_put_autosuspend(up->dev);
720 }
721
722 static int serial_omap_startup(struct uart_port *port)
723 {
724 struct uart_omap_port *up = to_uart_omap_port(port);
725 unsigned long flags = 0;
726 int retval;
727
728 /*
729 * Allocate the IRQ
730 */
731 retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags,
732 up->name, up);
733 if (retval)
734 return retval;
735
736 /* Optional wake-up IRQ */
737 if (up->wakeirq) {
738 retval = dev_pm_set_dedicated_wake_irq(up->dev, up->wakeirq);
739 if (retval) {
740 free_irq(up->port.irq, up);
741 return retval;
742 }
743 }
744
745 dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line);
746
747 pm_runtime_get_sync(up->dev);
748 /*
749 * Clear the FIFO buffers and disable them.
750 * (they will be reenabled in set_termios())
751 */
752 serial_omap_clear_fifos(up);
753
754 /*
755 * Clear the interrupt registers.
756 */
757 (void) serial_in(up, UART_LSR);
758 if (serial_in(up, UART_LSR) & UART_LSR_DR)
759 (void) serial_in(up, UART_RX);
760 (void) serial_in(up, UART_IIR);
761 (void) serial_in(up, UART_MSR);
762
763 /*
764 * Now, initialize the UART
765 */
766 serial_out(up, UART_LCR, UART_LCR_WLEN8);
767 spin_lock_irqsave(&up->port.lock, flags);
768 /*
769 * Most PC uarts need OUT2 raised to enable interrupts.
770 */
771 up->port.mctrl |= TIOCM_OUT2;
772 serial_omap_set_mctrl(&up->port, up->port.mctrl);
773 spin_unlock_irqrestore(&up->port.lock, flags);
774
775 up->msr_saved_flags = 0;
776 /*
777 * Finally, enable interrupts. Note: Modem status interrupts
778 * are set via set_termios(), which will be occurring imminently
779 * anyway, so we don't enable them here.
780 */
781 up->ier = UART_IER_RLSI | UART_IER_RDI;
782 serial_out(up, UART_IER, up->ier);
783
784 /* Enable module level wake up */
785 up->wer = OMAP_UART_WER_MOD_WKUP;
786 if (up->features & OMAP_UART_WER_HAS_TX_WAKEUP)
787 up->wer |= OMAP_UART_TX_WAKEUP_EN;
788
789 serial_out(up, UART_OMAP_WER, up->wer);
790
791 pm_runtime_mark_last_busy(up->dev);
792 pm_runtime_put_autosuspend(up->dev);
793 up->port_activity = jiffies;
794 return 0;
795 }
796
797 static void serial_omap_shutdown(struct uart_port *port)
798 {
799 struct uart_omap_port *up = to_uart_omap_port(port);
800 unsigned long flags = 0;
801
802 dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->port.line);
803
804 pm_runtime_get_sync(up->dev);
805 /*
806 * Disable interrupts from this port
807 */
808 up->ier = 0;
809 serial_out(up, UART_IER, 0);
810
811 spin_lock_irqsave(&up->port.lock, flags);
812 up->port.mctrl &= ~TIOCM_OUT2;
813 serial_omap_set_mctrl(&up->port, up->port.mctrl);
814 spin_unlock_irqrestore(&up->port.lock, flags);
815
816 /*
817 * Disable break condition and FIFOs
818 */
819 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
820 serial_omap_clear_fifos(up);
821
822 /*
823 * Read data port to reset things, and then free the irq
824 */
825 if (serial_in(up, UART_LSR) & UART_LSR_DR)
826 (void) serial_in(up, UART_RX);
827
828 pm_runtime_mark_last_busy(up->dev);
829 pm_runtime_put_autosuspend(up->dev);
830 free_irq(up->port.irq, up);
831 dev_pm_clear_wake_irq(up->dev);
832 }
833
834 static void serial_omap_uart_qos_work(struct work_struct *work)
835 {
836 struct uart_omap_port *up = container_of(work, struct uart_omap_port,
837 qos_work);
838
839 pm_qos_update_request(&up->pm_qos_request, up->latency);
840 }
841
842 static void
843 serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
844 struct ktermios *old)
845 {
846 struct uart_omap_port *up = to_uart_omap_port(port);
847 unsigned char cval = 0;
848 unsigned long flags = 0;
849 unsigned int baud, quot;
850
851 switch (termios->c_cflag & CSIZE) {
852 case CS5:
853 cval = UART_LCR_WLEN5;
854 break;
855 case CS6:
856 cval = UART_LCR_WLEN6;
857 break;
858 case CS7:
859 cval = UART_LCR_WLEN7;
860 break;
861 default:
862 case CS8:
863 cval = UART_LCR_WLEN8;
864 break;
865 }
866
867 if (termios->c_cflag & CSTOPB)
868 cval |= UART_LCR_STOP;
869 if (termios->c_cflag & PARENB)
870 cval |= UART_LCR_PARITY;
871 if (!(termios->c_cflag & PARODD))
872 cval |= UART_LCR_EPAR;
873 if (termios->c_cflag & CMSPAR)
874 cval |= UART_LCR_SPAR;
875
876 /*
877 * Ask the core to calculate the divisor for us.
878 */
879
880 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13);
881 quot = serial_omap_get_divisor(port, baud);
882
883 /* calculate wakeup latency constraint */
884 up->calc_latency = (USEC_PER_SEC * up->port.fifosize) / (baud / 8);
885 up->latency = up->calc_latency;
886 schedule_work(&up->qos_work);
887
888 up->dll = quot & 0xff;
889 up->dlh = quot >> 8;
890 up->mdr1 = UART_OMAP_MDR1_DISABLE;
891
892 up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 |
893 UART_FCR_ENABLE_FIFO;
894
895 /*
896 * Ok, we're now changing the port state. Do it with
897 * interrupts disabled.
898 */
899 pm_runtime_get_sync(up->dev);
900 spin_lock_irqsave(&up->port.lock, flags);
901
902 /*
903 * Update the per-port timeout.
904 */
905 uart_update_timeout(port, termios->c_cflag, baud);
906
907 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
908 if (termios->c_iflag & INPCK)
909 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
910 if (termios->c_iflag & (BRKINT | PARMRK))
911 up->port.read_status_mask |= UART_LSR_BI;
912
913 /*
914 * Characters to ignore
915 */
916 up->port.ignore_status_mask = 0;
917 if (termios->c_iflag & IGNPAR)
918 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
919 if (termios->c_iflag & IGNBRK) {
920 up->port.ignore_status_mask |= UART_LSR_BI;
921 /*
922 * If we're ignoring parity and break indicators,
923 * ignore overruns too (for real raw support).
924 */
925 if (termios->c_iflag & IGNPAR)
926 up->port.ignore_status_mask |= UART_LSR_OE;
927 }
928
929 /*
930 * ignore all characters if CREAD is not set
931 */
932 if ((termios->c_cflag & CREAD) == 0)
933 up->port.ignore_status_mask |= UART_LSR_DR;
934
935 /*
936 * Modem status interrupts
937 */
938 up->ier &= ~UART_IER_MSI;
939 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
940 up->ier |= UART_IER_MSI;
941 serial_out(up, UART_IER, up->ier);
942 serial_out(up, UART_LCR, cval); /* reset DLAB */
943 up->lcr = cval;
944 up->scr = 0;
945
946 /* FIFOs and DMA Settings */
947
948 /* FCR can be changed only when the
949 * baud clock is not running
950 * DLL_REG and DLH_REG set to 0.
951 */
952 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
953 serial_out(up, UART_DLL, 0);
954 serial_out(up, UART_DLM, 0);
955 serial_out(up, UART_LCR, 0);
956
957 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
958
959 up->efr = serial_in(up, UART_EFR) & ~UART_EFR_ECB;
960 up->efr &= ~UART_EFR_SCD;
961 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
962
963 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
964 up->mcr = serial_in(up, UART_MCR) & ~UART_MCR_TCRTLR;
965 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
966 /* FIFO ENABLE, DMA MODE */
967
968 up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK;
969 /*
970 * NOTE: Setting OMAP_UART_SCR_RX_TRIG_GRANU1_MASK
971 * sets Enables the granularity of 1 for TRIGGER RX
972 * level. Along with setting RX FIFO trigger level
973 * to 1 (as noted below, 16 characters) and TLR[3:0]
974 * to zero this will result RX FIFO threshold level
975 * to 1 character, instead of 16 as noted in comment
976 * below.
977 */
978
979 /* Set receive FIFO threshold to 16 characters and
980 * transmit FIFO threshold to 32 spaces
981 */
982 up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK;
983 up->fcr &= ~OMAP_UART_FCR_TX_FIFO_TRIG_MASK;
984 up->fcr |= UART_FCR6_R_TRIGGER_16 | UART_FCR6_T_TRIGGER_24 |
985 UART_FCR_ENABLE_FIFO;
986
987 serial_out(up, UART_FCR, up->fcr);
988 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
989
990 serial_out(up, UART_OMAP_SCR, up->scr);
991
992 /* Reset UART_MCR_TCRTLR: this must be done with the EFR_ECB bit set */
993 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
994 serial_out(up, UART_MCR, up->mcr);
995 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
996 serial_out(up, UART_EFR, up->efr);
997 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
998
999 /* Protocol, Baud Rate, and Interrupt Settings */
1000
1001 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1002 serial_omap_mdr1_errataset(up, up->mdr1);
1003 else
1004 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1005
1006 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1007 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
1008
1009 serial_out(up, UART_LCR, 0);
1010 serial_out(up, UART_IER, 0);
1011 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1012
1013 serial_out(up, UART_DLL, up->dll); /* LS of divisor */
1014 serial_out(up, UART_DLM, up->dlh); /* MS of divisor */
1015
1016 serial_out(up, UART_LCR, 0);
1017 serial_out(up, UART_IER, up->ier);
1018 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1019
1020 serial_out(up, UART_EFR, up->efr);
1021 serial_out(up, UART_LCR, cval);
1022
1023 if (!serial_omap_baud_is_mode16(port, baud))
1024 up->mdr1 = UART_OMAP_MDR1_13X_MODE;
1025 else
1026 up->mdr1 = UART_OMAP_MDR1_16X_MODE;
1027
1028 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1029 serial_omap_mdr1_errataset(up, up->mdr1);
1030 else
1031 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1032
1033 /* Configure flow control */
1034 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1035
1036 /* XON1/XOFF1 accessible mode B, TCRTLR=0, ECB=0 */
1037 serial_out(up, UART_XON1, termios->c_cc[VSTART]);
1038 serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]);
1039
1040 /* Enable access to TCR/TLR */
1041 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
1042 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
1043 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
1044
1045 serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
1046
1047 up->port.status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS | UPSTAT_AUTOXOFF);
1048
1049 if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) {
1050 /* Enable AUTOCTS (autoRTS is enabled when RTS is raised) */
1051 up->port.status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS;
1052 up->efr |= UART_EFR_CTS;
1053 } else {
1054 /* Disable AUTORTS and AUTOCTS */
1055 up->efr &= ~(UART_EFR_CTS | UART_EFR_RTS);
1056 }
1057
1058 if (up->port.flags & UPF_SOFT_FLOW) {
1059 /* clear SW control mode bits */
1060 up->efr &= OMAP_UART_SW_CLR;
1061
1062 /*
1063 * IXON Flag:
1064 * Enable XON/XOFF flow control on input.
1065 * Receiver compares XON1, XOFF1.
1066 */
1067 if (termios->c_iflag & IXON)
1068 up->efr |= OMAP_UART_SW_RX;
1069
1070 /*
1071 * IXOFF Flag:
1072 * Enable XON/XOFF flow control on output.
1073 * Transmit XON1, XOFF1
1074 */
1075 if (termios->c_iflag & IXOFF) {
1076 up->port.status |= UPSTAT_AUTOXOFF;
1077 up->efr |= OMAP_UART_SW_TX;
1078 }
1079
1080 /*
1081 * IXANY Flag:
1082 * Enable any character to restart output.
1083 * Operation resumes after receiving any
1084 * character after recognition of the XOFF character
1085 */
1086 if (termios->c_iflag & IXANY)
1087 up->mcr |= UART_MCR_XONANY;
1088 else
1089 up->mcr &= ~UART_MCR_XONANY;
1090 }
1091 serial_out(up, UART_MCR, up->mcr);
1092 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1093 serial_out(up, UART_EFR, up->efr);
1094 serial_out(up, UART_LCR, up->lcr);
1095
1096 serial_omap_set_mctrl(&up->port, up->port.mctrl);
1097
1098 spin_unlock_irqrestore(&up->port.lock, flags);
1099 pm_runtime_mark_last_busy(up->dev);
1100 pm_runtime_put_autosuspend(up->dev);
1101 dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line);
1102 }
1103
1104 static void
1105 serial_omap_pm(struct uart_port *port, unsigned int state,
1106 unsigned int oldstate)
1107 {
1108 struct uart_omap_port *up = to_uart_omap_port(port);
1109 unsigned char efr;
1110
1111 dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line);
1112
1113 pm_runtime_get_sync(up->dev);
1114 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1115 efr = serial_in(up, UART_EFR);
1116 serial_out(up, UART_EFR, efr | UART_EFR_ECB);
1117 serial_out(up, UART_LCR, 0);
1118
1119 serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0);
1120 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1121 serial_out(up, UART_EFR, efr);
1122 serial_out(up, UART_LCR, 0);
1123
1124 pm_runtime_mark_last_busy(up->dev);
1125 pm_runtime_put_autosuspend(up->dev);
1126 }
1127
1128 static void serial_omap_release_port(struct uart_port *port)
1129 {
1130 dev_dbg(port->dev, "serial_omap_release_port+\n");
1131 }
1132
1133 static int serial_omap_request_port(struct uart_port *port)
1134 {
1135 dev_dbg(port->dev, "serial_omap_request_port+\n");
1136 return 0;
1137 }
1138
1139 static void serial_omap_config_port(struct uart_port *port, int flags)
1140 {
1141 struct uart_omap_port *up = to_uart_omap_port(port);
1142
1143 dev_dbg(up->port.dev, "serial_omap_config_port+%d\n",
1144 up->port.line);
1145 up->port.type = PORT_OMAP;
1146 up->port.flags |= UPF_SOFT_FLOW | UPF_HARD_FLOW;
1147 }
1148
1149 static int
1150 serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser)
1151 {
1152 /* we don't want the core code to modify any port params */
1153 dev_dbg(port->dev, "serial_omap_verify_port+\n");
1154 return -EINVAL;
1155 }
1156
1157 static const char *
1158 serial_omap_type(struct uart_port *port)
1159 {
1160 struct uart_omap_port *up = to_uart_omap_port(port);
1161
1162 dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->port.line);
1163 return up->name;
1164 }
1165
1166 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
1167
1168 static void wait_for_xmitr(struct uart_omap_port *up)
1169 {
1170 unsigned int status, tmout = 10000;
1171
1172 /* Wait up to 10ms for the character(s) to be sent. */
1173 do {
1174 status = serial_in(up, UART_LSR);
1175
1176 if (status & UART_LSR_BI)
1177 up->lsr_break_flag = UART_LSR_BI;
1178
1179 if (--tmout == 0)
1180 break;
1181 udelay(1);
1182 } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
1183
1184 /* Wait up to 1s for flow control if necessary */
1185 if (up->port.flags & UPF_CONS_FLOW) {
1186 tmout = 1000000;
1187 for (tmout = 1000000; tmout; tmout--) {
1188 unsigned int msr = serial_in(up, UART_MSR);
1189
1190 up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
1191 if (msr & UART_MSR_CTS)
1192 break;
1193
1194 udelay(1);
1195 }
1196 }
1197 }
1198
1199 #ifdef CONFIG_CONSOLE_POLL
1200
1201 static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch)
1202 {
1203 struct uart_omap_port *up = to_uart_omap_port(port);
1204
1205 pm_runtime_get_sync(up->dev);
1206 wait_for_xmitr(up);
1207 serial_out(up, UART_TX, ch);
1208 pm_runtime_mark_last_busy(up->dev);
1209 pm_runtime_put_autosuspend(up->dev);
1210 }
1211
1212 static int serial_omap_poll_get_char(struct uart_port *port)
1213 {
1214 struct uart_omap_port *up = to_uart_omap_port(port);
1215 unsigned int status;
1216
1217 pm_runtime_get_sync(up->dev);
1218 status = serial_in(up, UART_LSR);
1219 if (!(status & UART_LSR_DR)) {
1220 status = NO_POLL_CHAR;
1221 goto out;
1222 }
1223
1224 status = serial_in(up, UART_RX);
1225
1226 out:
1227 pm_runtime_mark_last_busy(up->dev);
1228 pm_runtime_put_autosuspend(up->dev);
1229
1230 return status;
1231 }
1232
1233 #endif /* CONFIG_CONSOLE_POLL */
1234
1235 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
1236
1237 static struct uart_omap_port *serial_omap_console_ports[OMAP_MAX_HSUART_PORTS];
1238
1239 static struct uart_driver serial_omap_reg;
1240
1241 static void serial_omap_console_putchar(struct uart_port *port, int ch)
1242 {
1243 struct uart_omap_port *up = to_uart_omap_port(port);
1244
1245 wait_for_xmitr(up);
1246 serial_out(up, UART_TX, ch);
1247 }
1248
1249 static void
1250 serial_omap_console_write(struct console *co, const char *s,
1251 unsigned int count)
1252 {
1253 struct uart_omap_port *up = serial_omap_console_ports[co->index];
1254 unsigned long flags;
1255 unsigned int ier;
1256 int locked = 1;
1257
1258 pm_runtime_get_sync(up->dev);
1259
1260 local_irq_save(flags);
1261 if (up->port.sysrq)
1262 locked = 0;
1263 else if (oops_in_progress)
1264 locked = spin_trylock(&up->port.lock);
1265 else
1266 spin_lock(&up->port.lock);
1267
1268 /*
1269 * First save the IER then disable the interrupts
1270 */
1271 ier = serial_in(up, UART_IER);
1272 serial_out(up, UART_IER, 0);
1273
1274 uart_console_write(&up->port, s, count, serial_omap_console_putchar);
1275
1276 /*
1277 * Finally, wait for transmitter to become empty
1278 * and restore the IER
1279 */
1280 wait_for_xmitr(up);
1281 serial_out(up, UART_IER, ier);
1282 /*
1283 * The receive handling will happen properly because the
1284 * receive ready bit will still be set; it is not cleared
1285 * on read. However, modem control will not, we must
1286 * call it if we have saved something in the saved flags
1287 * while processing with interrupts off.
1288 */
1289 if (up->msr_saved_flags)
1290 check_modem_status(up);
1291
1292 pm_runtime_mark_last_busy(up->dev);
1293 pm_runtime_put_autosuspend(up->dev);
1294 if (locked)
1295 spin_unlock(&up->port.lock);
1296 local_irq_restore(flags);
1297 }
1298
1299 static int __init
1300 serial_omap_console_setup(struct console *co, char *options)
1301 {
1302 struct uart_omap_port *up;
1303 int baud = 115200;
1304 int bits = 8;
1305 int parity = 'n';
1306 int flow = 'n';
1307
1308 if (serial_omap_console_ports[co->index] == NULL)
1309 return -ENODEV;
1310 up = serial_omap_console_ports[co->index];
1311
1312 if (options)
1313 uart_parse_options(options, &baud, &parity, &bits, &flow);
1314
1315 return uart_set_options(&up->port, co, baud, parity, bits, flow);
1316 }
1317
1318 static struct console serial_omap_console = {
1319 .name = OMAP_SERIAL_NAME,
1320 .write = serial_omap_console_write,
1321 .device = uart_console_device,
1322 .setup = serial_omap_console_setup,
1323 .flags = CON_PRINTBUFFER,
1324 .index = -1,
1325 .data = &serial_omap_reg,
1326 };
1327
1328 static void serial_omap_add_console_port(struct uart_omap_port *up)
1329 {
1330 serial_omap_console_ports[up->port.line] = up;
1331 }
1332
1333 #define OMAP_CONSOLE (&serial_omap_console)
1334
1335 #else
1336
1337 #define OMAP_CONSOLE NULL
1338
1339 static inline void serial_omap_add_console_port(struct uart_omap_port *up)
1340 {}
1341
1342 #endif
1343
1344 /* Enable or disable the rs485 support */
1345 static int
1346 serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485conf)
1347 {
1348 struct uart_omap_port *up = to_uart_omap_port(port);
1349 unsigned int mode;
1350 int val;
1351
1352 pm_runtime_get_sync(up->dev);
1353
1354 /* Disable interrupts from this port */
1355 mode = up->ier;
1356 up->ier = 0;
1357 serial_out(up, UART_IER, 0);
1358
1359 /* store new config */
1360 port->rs485 = *rs485conf;
1361
1362 /*
1363 * Just as a precaution, only allow rs485
1364 * to be enabled if the gpio pin is valid
1365 */
1366 if (gpio_is_valid(up->rts_gpio)) {
1367 /* enable / disable rts */
1368 val = (port->rs485.flags & SER_RS485_ENABLED) ?
1369 SER_RS485_RTS_AFTER_SEND : SER_RS485_RTS_ON_SEND;
1370 val = (port->rs485.flags & val) ? 1 : 0;
1371 gpio_set_value(up->rts_gpio, val);
1372 } else
1373 port->rs485.flags &= ~SER_RS485_ENABLED;
1374
1375 /* Enable interrupts */
1376 up->ier = mode;
1377 serial_out(up, UART_IER, up->ier);
1378
1379 /* If RS-485 is disabled, make sure the THR interrupt is fired when
1380 * TX FIFO is below the trigger level.
1381 */
1382 if (!(port->rs485.flags & SER_RS485_ENABLED) &&
1383 (up->scr & OMAP_UART_SCR_TX_EMPTY)) {
1384 up->scr &= ~OMAP_UART_SCR_TX_EMPTY;
1385 serial_out(up, UART_OMAP_SCR, up->scr);
1386 }
1387
1388 pm_runtime_mark_last_busy(up->dev);
1389 pm_runtime_put_autosuspend(up->dev);
1390
1391 return 0;
1392 }
1393
1394 static struct uart_ops serial_omap_pops = {
1395 .tx_empty = serial_omap_tx_empty,
1396 .set_mctrl = serial_omap_set_mctrl,
1397 .get_mctrl = serial_omap_get_mctrl,
1398 .stop_tx = serial_omap_stop_tx,
1399 .start_tx = serial_omap_start_tx,
1400 .throttle = serial_omap_throttle,
1401 .unthrottle = serial_omap_unthrottle,
1402 .stop_rx = serial_omap_stop_rx,
1403 .enable_ms = serial_omap_enable_ms,
1404 .break_ctl = serial_omap_break_ctl,
1405 .startup = serial_omap_startup,
1406 .shutdown = serial_omap_shutdown,
1407 .set_termios = serial_omap_set_termios,
1408 .pm = serial_omap_pm,
1409 .type = serial_omap_type,
1410 .release_port = serial_omap_release_port,
1411 .request_port = serial_omap_request_port,
1412 .config_port = serial_omap_config_port,
1413 .verify_port = serial_omap_verify_port,
1414 #ifdef CONFIG_CONSOLE_POLL
1415 .poll_put_char = serial_omap_poll_put_char,
1416 .poll_get_char = serial_omap_poll_get_char,
1417 #endif
1418 };
1419
1420 static struct uart_driver serial_omap_reg = {
1421 .owner = THIS_MODULE,
1422 .driver_name = "OMAP-SERIAL",
1423 .dev_name = OMAP_SERIAL_NAME,
1424 .nr = OMAP_MAX_HSUART_PORTS,
1425 .cons = OMAP_CONSOLE,
1426 };
1427
1428 #ifdef CONFIG_PM_SLEEP
1429 static int serial_omap_prepare(struct device *dev)
1430 {
1431 struct uart_omap_port *up = dev_get_drvdata(dev);
1432
1433 up->is_suspending = true;
1434
1435 return 0;
1436 }
1437
1438 static void serial_omap_complete(struct device *dev)
1439 {
1440 struct uart_omap_port *up = dev_get_drvdata(dev);
1441
1442 up->is_suspending = false;
1443 }
1444
1445 static int serial_omap_suspend(struct device *dev)
1446 {
1447 struct uart_omap_port *up = dev_get_drvdata(dev);
1448
1449 uart_suspend_port(&serial_omap_reg, &up->port);
1450 flush_work(&up->qos_work);
1451
1452 if (device_may_wakeup(dev))
1453 serial_omap_enable_wakeup(up, true);
1454 else
1455 serial_omap_enable_wakeup(up, false);
1456
1457 return 0;
1458 }
1459
1460 static int serial_omap_resume(struct device *dev)
1461 {
1462 struct uart_omap_port *up = dev_get_drvdata(dev);
1463
1464 if (device_may_wakeup(dev))
1465 serial_omap_enable_wakeup(up, false);
1466
1467 uart_resume_port(&serial_omap_reg, &up->port);
1468
1469 return 0;
1470 }
1471 #else
1472 #define serial_omap_prepare NULL
1473 #define serial_omap_complete NULL
1474 #endif /* CONFIG_PM_SLEEP */
1475
1476 static void omap_serial_fill_features_erratas(struct uart_omap_port *up)
1477 {
1478 u32 mvr, scheme;
1479 u16 revision, major, minor;
1480
1481 mvr = readl(up->port.membase + (UART_OMAP_MVER << up->port.regshift));
1482
1483 /* Check revision register scheme */
1484 scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT;
1485
1486 switch (scheme) {
1487 case 0: /* Legacy Scheme: OMAP2/3 */
1488 /* MINOR_REV[0:4], MAJOR_REV[4:7] */
1489 major = (mvr & OMAP_UART_LEGACY_MVR_MAJ_MASK) >>
1490 OMAP_UART_LEGACY_MVR_MAJ_SHIFT;
1491 minor = (mvr & OMAP_UART_LEGACY_MVR_MIN_MASK);
1492 break;
1493 case 1:
1494 /* New Scheme: OMAP4+ */
1495 /* MINOR_REV[0:5], MAJOR_REV[8:10] */
1496 major = (mvr & OMAP_UART_MVR_MAJ_MASK) >>
1497 OMAP_UART_MVR_MAJ_SHIFT;
1498 minor = (mvr & OMAP_UART_MVR_MIN_MASK);
1499 break;
1500 default:
1501 dev_warn(up->dev,
1502 "Unknown %s revision, defaulting to highest\n",
1503 up->name);
1504 /* highest possible revision */
1505 major = 0xff;
1506 minor = 0xff;
1507 }
1508
1509 /* normalize revision for the driver */
1510 revision = UART_BUILD_REVISION(major, minor);
1511
1512 switch (revision) {
1513 case OMAP_UART_REV_46:
1514 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1515 UART_ERRATA_i291_DMA_FORCEIDLE);
1516 break;
1517 case OMAP_UART_REV_52:
1518 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1519 UART_ERRATA_i291_DMA_FORCEIDLE);
1520 up->features |= OMAP_UART_WER_HAS_TX_WAKEUP;
1521 break;
1522 case OMAP_UART_REV_63:
1523 up->errata |= UART_ERRATA_i202_MDR1_ACCESS;
1524 up->features |= OMAP_UART_WER_HAS_TX_WAKEUP;
1525 break;
1526 default:
1527 break;
1528 }
1529 }
1530
1531 static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev)
1532 {
1533 struct omap_uart_port_info *omap_up_info;
1534
1535 omap_up_info = devm_kzalloc(dev, sizeof(*omap_up_info), GFP_KERNEL);
1536 if (!omap_up_info)
1537 return NULL; /* out of memory */
1538
1539 of_property_read_u32(dev->of_node, "clock-frequency",
1540 &omap_up_info->uartclk);
1541 return omap_up_info;
1542 }
1543
1544 static int serial_omap_probe_rs485(struct uart_omap_port *up,
1545 struct device_node *np)
1546 {
1547 struct serial_rs485 *rs485conf = &up->port.rs485;
1548 u32 rs485_delay[2];
1549 enum of_gpio_flags flags;
1550 int ret;
1551
1552 rs485conf->flags = 0;
1553 up->rts_gpio = -EINVAL;
1554
1555 if (!np)
1556 return 0;
1557
1558 if (of_property_read_bool(np, "rs485-rts-active-high"))
1559 rs485conf->flags |= SER_RS485_RTS_ON_SEND;
1560 else
1561 rs485conf->flags |= SER_RS485_RTS_AFTER_SEND;
1562
1563 /* check for tx enable gpio */
1564 up->rts_gpio = of_get_named_gpio_flags(np, "rts-gpio", 0, &flags);
1565 if (gpio_is_valid(up->rts_gpio)) {
1566 ret = devm_gpio_request(up->dev, up->rts_gpio, "omap-serial");
1567 if (ret < 0)
1568 return ret;
1569 ret = gpio_direction_output(up->rts_gpio,
1570 flags & SER_RS485_RTS_AFTER_SEND);
1571 if (ret < 0)
1572 return ret;
1573 } else if (up->rts_gpio == -EPROBE_DEFER) {
1574 return -EPROBE_DEFER;
1575 } else {
1576 up->rts_gpio = -EINVAL;
1577 }
1578
1579 if (of_property_read_u32_array(np, "rs485-rts-delay",
1580 rs485_delay, 2) == 0) {
1581 rs485conf->delay_rts_before_send = rs485_delay[0];
1582 rs485conf->delay_rts_after_send = rs485_delay[1];
1583 }
1584
1585 if (of_property_read_bool(np, "rs485-rx-during-tx"))
1586 rs485conf->flags |= SER_RS485_RX_DURING_TX;
1587
1588 if (of_property_read_bool(np, "linux,rs485-enabled-at-boot-time"))
1589 rs485conf->flags |= SER_RS485_ENABLED;
1590
1591 return 0;
1592 }
1593
1594 static int serial_omap_probe(struct platform_device *pdev)
1595 {
1596 struct omap_uart_port_info *omap_up_info = dev_get_platdata(&pdev->dev);
1597 struct uart_omap_port *up;
1598 struct resource *mem;
1599 void __iomem *base;
1600 int uartirq = 0;
1601 int wakeirq = 0;
1602 int ret;
1603
1604 /* The optional wakeirq may be specified in the board dts file */
1605 if (pdev->dev.of_node) {
1606 uartirq = irq_of_parse_and_map(pdev->dev.of_node, 0);
1607 if (!uartirq)
1608 return -EPROBE_DEFER;
1609 wakeirq = irq_of_parse_and_map(pdev->dev.of_node, 1);
1610 omap_up_info = of_get_uart_port_info(&pdev->dev);
1611 pdev->dev.platform_data = omap_up_info;
1612 } else {
1613 uartirq = platform_get_irq(pdev, 0);
1614 if (uartirq < 0)
1615 return -EPROBE_DEFER;
1616 }
1617
1618 up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL);
1619 if (!up)
1620 return -ENOMEM;
1621
1622 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1623 base = devm_ioremap_resource(&pdev->dev, mem);
1624 if (IS_ERR(base))
1625 return PTR_ERR(base);
1626
1627 up->dev = &pdev->dev;
1628 up->port.dev = &pdev->dev;
1629 up->port.type = PORT_OMAP;
1630 up->port.iotype = UPIO_MEM;
1631 up->port.irq = uartirq;
1632 up->port.regshift = 2;
1633 up->port.fifosize = 64;
1634 up->port.ops = &serial_omap_pops;
1635
1636 if (pdev->dev.of_node)
1637 ret = of_alias_get_id(pdev->dev.of_node, "serial");
1638 else
1639 ret = pdev->id;
1640
1641 if (ret < 0) {
1642 dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n",
1643 ret);
1644 goto err_port_line;
1645 }
1646 up->port.line = ret;
1647
1648 if (up->port.line >= OMAP_MAX_HSUART_PORTS) {
1649 dev_err(&pdev->dev, "uart ID %d > MAX %d.\n", up->port.line,
1650 OMAP_MAX_HSUART_PORTS);
1651 ret = -ENXIO;
1652 goto err_port_line;
1653 }
1654
1655 up->wakeirq = wakeirq;
1656 if (!up->wakeirq)
1657 dev_info(up->port.dev, "no wakeirq for uart%d\n",
1658 up->port.line);
1659
1660 ret = serial_omap_probe_rs485(up, pdev->dev.of_node);
1661 if (ret < 0)
1662 goto err_rs485;
1663
1664 sprintf(up->name, "OMAP UART%d", up->port.line);
1665 up->port.mapbase = mem->start;
1666 up->port.membase = base;
1667 up->port.flags = omap_up_info->flags;
1668 up->port.uartclk = omap_up_info->uartclk;
1669 up->port.rs485_config = serial_omap_config_rs485;
1670 if (!up->port.uartclk) {
1671 up->port.uartclk = DEFAULT_CLK_SPEED;
1672 dev_warn(&pdev->dev,
1673 "No clock speed specified: using default: %d\n",
1674 DEFAULT_CLK_SPEED);
1675 }
1676
1677 up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1678 up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1679 pm_qos_add_request(&up->pm_qos_request,
1680 PM_QOS_CPU_DMA_LATENCY, up->latency);
1681 INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
1682
1683 platform_set_drvdata(pdev, up);
1684 if (omap_up_info->autosuspend_timeout == 0)
1685 omap_up_info->autosuspend_timeout = -1;
1686
1687 device_init_wakeup(up->dev, true);
1688 pm_runtime_use_autosuspend(&pdev->dev);
1689 pm_runtime_set_autosuspend_delay(&pdev->dev,
1690 omap_up_info->autosuspend_timeout);
1691
1692 pm_runtime_irq_safe(&pdev->dev);
1693 pm_runtime_enable(&pdev->dev);
1694
1695 pm_runtime_get_sync(&pdev->dev);
1696
1697 omap_serial_fill_features_erratas(up);
1698
1699 ui[up->port.line] = up;
1700 serial_omap_add_console_port(up);
1701
1702 ret = uart_add_one_port(&serial_omap_reg, &up->port);
1703 if (ret != 0)
1704 goto err_add_port;
1705
1706 pm_runtime_mark_last_busy(up->dev);
1707 pm_runtime_put_autosuspend(up->dev);
1708 return 0;
1709
1710 err_add_port:
1711 pm_runtime_put(&pdev->dev);
1712 pm_runtime_disable(&pdev->dev);
1713 pm_qos_remove_request(&up->pm_qos_request);
1714 device_init_wakeup(up->dev, false);
1715 err_rs485:
1716 err_port_line:
1717 return ret;
1718 }
1719
1720 static int serial_omap_remove(struct platform_device *dev)
1721 {
1722 struct uart_omap_port *up = platform_get_drvdata(dev);
1723
1724 pm_runtime_put_sync(up->dev);
1725 pm_runtime_disable(up->dev);
1726 uart_remove_one_port(&serial_omap_reg, &up->port);
1727 pm_qos_remove_request(&up->pm_qos_request);
1728 device_init_wakeup(&dev->dev, false);
1729
1730 return 0;
1731 }
1732
1733 /*
1734 * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460)
1735 * The access to uart register after MDR1 Access
1736 * causes UART to corrupt data.
1737 *
1738 * Need a delay =
1739 * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS)
1740 * give 10 times as much
1741 */
1742 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1)
1743 {
1744 u8 timeout = 255;
1745
1746 serial_out(up, UART_OMAP_MDR1, mdr1);
1747 udelay(2);
1748 serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT |
1749 UART_FCR_CLEAR_RCVR);
1750 /*
1751 * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and
1752 * TX_FIFO_E bit is 1.
1753 */
1754 while (UART_LSR_THRE != (serial_in(up, UART_LSR) &
1755 (UART_LSR_THRE | UART_LSR_DR))) {
1756 timeout--;
1757 if (!timeout) {
1758 /* Should *never* happen. we warn and carry on */
1759 dev_crit(up->dev, "Errata i202: timedout %x\n",
1760 serial_in(up, UART_LSR));
1761 break;
1762 }
1763 udelay(1);
1764 }
1765 }
1766
1767 #ifdef CONFIG_PM
1768 static void serial_omap_restore_context(struct uart_omap_port *up)
1769 {
1770 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1771 serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE);
1772 else
1773 serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE);
1774
1775 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1776 serial_out(up, UART_EFR, UART_EFR_ECB);
1777 serial_out(up, UART_LCR, 0x0); /* Operational mode */
1778 serial_out(up, UART_IER, 0x0);
1779 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1780 serial_out(up, UART_DLL, up->dll);
1781 serial_out(up, UART_DLM, up->dlh);
1782 serial_out(up, UART_LCR, 0x0); /* Operational mode */
1783 serial_out(up, UART_IER, up->ier);
1784 serial_out(up, UART_FCR, up->fcr);
1785 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
1786 serial_out(up, UART_MCR, up->mcr);
1787 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1788 serial_out(up, UART_OMAP_SCR, up->scr);
1789 serial_out(up, UART_EFR, up->efr);
1790 serial_out(up, UART_LCR, up->lcr);
1791 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1792 serial_omap_mdr1_errataset(up, up->mdr1);
1793 else
1794 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1795 serial_out(up, UART_OMAP_WER, up->wer);
1796 }
1797
1798 static int serial_omap_runtime_suspend(struct device *dev)
1799 {
1800 struct uart_omap_port *up = dev_get_drvdata(dev);
1801
1802 if (!up)
1803 return -EINVAL;
1804
1805 /*
1806 * When using 'no_console_suspend', the console UART must not be
1807 * suspended. Since driver suspend is managed by runtime suspend,
1808 * preventing runtime suspend (by returning error) will keep device
1809 * active during suspend.
1810 */
1811 if (up->is_suspending && !console_suspend_enabled &&
1812 uart_console(&up->port))
1813 return -EBUSY;
1814
1815 up->context_loss_cnt = serial_omap_get_context_loss_count(up);
1816
1817 serial_omap_enable_wakeup(up, true);
1818
1819 up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1820 schedule_work(&up->qos_work);
1821
1822 return 0;
1823 }
1824
1825 static int serial_omap_runtime_resume(struct device *dev)
1826 {
1827 struct uart_omap_port *up = dev_get_drvdata(dev);
1828
1829 int loss_cnt = serial_omap_get_context_loss_count(up);
1830
1831 serial_omap_enable_wakeup(up, false);
1832
1833 if (loss_cnt < 0) {
1834 dev_dbg(dev, "serial_omap_get_context_loss_count failed : %d\n",
1835 loss_cnt);
1836 serial_omap_restore_context(up);
1837 } else if (up->context_loss_cnt != loss_cnt) {
1838 serial_omap_restore_context(up);
1839 }
1840 up->latency = up->calc_latency;
1841 schedule_work(&up->qos_work);
1842
1843 return 0;
1844 }
1845 #endif
1846
1847 static const struct dev_pm_ops serial_omap_dev_pm_ops = {
1848 SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume)
1849 SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend,
1850 serial_omap_runtime_resume, NULL)
1851 .prepare = serial_omap_prepare,
1852 .complete = serial_omap_complete,
1853 };
1854
1855 #if defined(CONFIG_OF)
1856 static const struct of_device_id omap_serial_of_match[] = {
1857 { .compatible = "ti,omap2-uart" },
1858 { .compatible = "ti,omap3-uart" },
1859 { .compatible = "ti,omap4-uart" },
1860 {},
1861 };
1862 MODULE_DEVICE_TABLE(of, omap_serial_of_match);
1863 #endif
1864
1865 static struct platform_driver serial_omap_driver = {
1866 .probe = serial_omap_probe,
1867 .remove = serial_omap_remove,
1868 .driver = {
1869 .name = DRIVER_NAME,
1870 .pm = &serial_omap_dev_pm_ops,
1871 .of_match_table = of_match_ptr(omap_serial_of_match),
1872 },
1873 };
1874
1875 static int __init serial_omap_init(void)
1876 {
1877 int ret;
1878
1879 ret = uart_register_driver(&serial_omap_reg);
1880 if (ret != 0)
1881 return ret;
1882 ret = platform_driver_register(&serial_omap_driver);
1883 if (ret != 0)
1884 uart_unregister_driver(&serial_omap_reg);
1885 return ret;
1886 }
1887
1888 static void __exit serial_omap_exit(void)
1889 {
1890 platform_driver_unregister(&serial_omap_driver);
1891 uart_unregister_driver(&serial_omap_reg);
1892 }
1893
1894 module_init(serial_omap_init);
1895 module_exit(serial_omap_exit);
1896
1897 MODULE_DESCRIPTION("OMAP High Speed UART driver");
1898 MODULE_LICENSE("GPL");
1899 MODULE_AUTHOR("Texas Instruments Inc");
Linux kernel - Deliverables
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