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xenbus_client.c: correct exit path for xenbus_map_ring_valloc_hvm
[GitHub/mt8127/android_kernel_alcatel_ttab.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/of.h>
42 #include <linux/gpio.h>
43 #include <linux/pinctrl/consumer.h>
44 #include <linux/platform_data/serial-omap.h>
45
46 #define OMAP_MAX_HSUART_PORTS 6
47
48 #define UART_BUILD_REVISION(x, y) (((x) << 8) | (y))
49
50 #define OMAP_UART_REV_42 0x0402
51 #define OMAP_UART_REV_46 0x0406
52 #define OMAP_UART_REV_52 0x0502
53 #define OMAP_UART_REV_63 0x0603
54
55 #define UART_ERRATA_i202_MDR1_ACCESS BIT(0)
56 #define UART_ERRATA_i291_DMA_FORCEIDLE BIT(1)
57
58 #define DEFAULT_CLK_SPEED 48000000 /* 48Mhz*/
59
60 /* SCR register bitmasks */
61 #define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK (1 << 7)
62 #define OMAP_UART_SCR_TX_TRIG_GRANU1_MASK (1 << 6)
63 #define OMAP_UART_SCR_TX_EMPTY (1 << 3)
64
65 /* FCR register bitmasks */
66 #define OMAP_UART_FCR_RX_FIFO_TRIG_MASK (0x3 << 6)
67 #define OMAP_UART_FCR_TX_FIFO_TRIG_MASK (0x3 << 4)
68
69 /* MVR register bitmasks */
70 #define OMAP_UART_MVR_SCHEME_SHIFT 30
71
72 #define OMAP_UART_LEGACY_MVR_MAJ_MASK 0xf0
73 #define OMAP_UART_LEGACY_MVR_MAJ_SHIFT 4
74 #define OMAP_UART_LEGACY_MVR_MIN_MASK 0x0f
75
76 #define OMAP_UART_MVR_MAJ_MASK 0x700
77 #define OMAP_UART_MVR_MAJ_SHIFT 8
78 #define OMAP_UART_MVR_MIN_MASK 0x3f
79
80 #define OMAP_UART_DMA_CH_FREE -1
81
82 #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
83 #define OMAP_MODE13X_SPEED 230400
84
85 /* WER = 0x7F
86 * Enable module level wakeup in WER reg
87 */
88 #define OMAP_UART_WER_MOD_WKUP 0X7F
89
90 /* Enable XON/XOFF flow control on output */
91 #define OMAP_UART_SW_TX 0x08
92
93 /* Enable XON/XOFF flow control on input */
94 #define OMAP_UART_SW_RX 0x02
95
96 #define OMAP_UART_SW_CLR 0xF0
97
98 #define OMAP_UART_TCR_TRIG 0x0F
99
100 struct uart_omap_dma {
101 u8 uart_dma_tx;
102 u8 uart_dma_rx;
103 int rx_dma_channel;
104 int tx_dma_channel;
105 dma_addr_t rx_buf_dma_phys;
106 dma_addr_t tx_buf_dma_phys;
107 unsigned int uart_base;
108 /*
109 * Buffer for rx dma.It is not required for tx because the buffer
110 * comes from port structure.
111 */
112 unsigned char *rx_buf;
113 unsigned int prev_rx_dma_pos;
114 int tx_buf_size;
115 int tx_dma_used;
116 int rx_dma_used;
117 spinlock_t tx_lock;
118 spinlock_t rx_lock;
119 /* timer to poll activity on rx dma */
120 struct timer_list rx_timer;
121 unsigned int rx_buf_size;
122 unsigned int rx_poll_rate;
123 unsigned int rx_timeout;
124 };
125
126 struct uart_omap_port {
127 struct uart_port port;
128 struct uart_omap_dma uart_dma;
129 struct device *dev;
130
131 unsigned char ier;
132 unsigned char lcr;
133 unsigned char mcr;
134 unsigned char fcr;
135 unsigned char efr;
136 unsigned char dll;
137 unsigned char dlh;
138 unsigned char mdr1;
139 unsigned char scr;
140
141 int use_dma;
142 /*
143 * Some bits in registers are cleared on a read, so they must
144 * be saved whenever the register is read but the bits will not
145 * be immediately processed.
146 */
147 unsigned int lsr_break_flag;
148 unsigned char msr_saved_flags;
149 char name[20];
150 unsigned long port_activity;
151 int context_loss_cnt;
152 u32 errata;
153 u8 wakeups_enabled;
154
155 int DTR_gpio;
156 int DTR_inverted;
157 int DTR_active;
158
159 struct pm_qos_request pm_qos_request;
160 u32 latency;
161 u32 calc_latency;
162 struct work_struct qos_work;
163 struct pinctrl *pins;
164 };
165
166 #define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port)))
167
168 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
169
170 /* Forward declaration of functions */
171 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1);
172
173 static struct workqueue_struct *serial_omap_uart_wq;
174
175 static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
176 {
177 offset <<= up->port.regshift;
178 return readw(up->port.membase + offset);
179 }
180
181 static inline void serial_out(struct uart_omap_port *up, int offset, int value)
182 {
183 offset <<= up->port.regshift;
184 writew(value, up->port.membase + offset);
185 }
186
187 static inline void serial_omap_clear_fifos(struct uart_omap_port *up)
188 {
189 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
190 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
191 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
192 serial_out(up, UART_FCR, 0);
193 }
194
195 static int serial_omap_get_context_loss_count(struct uart_omap_port *up)
196 {
197 struct omap_uart_port_info *pdata = up->dev->platform_data;
198
199 if (!pdata || !pdata->get_context_loss_count)
200 return 0;
201
202 return pdata->get_context_loss_count(up->dev);
203 }
204
205 static void serial_omap_set_forceidle(struct uart_omap_port *up)
206 {
207 struct omap_uart_port_info *pdata = up->dev->platform_data;
208
209 if (!pdata || !pdata->set_forceidle)
210 return;
211
212 pdata->set_forceidle(up->dev);
213 }
214
215 static void serial_omap_set_noidle(struct uart_omap_port *up)
216 {
217 struct omap_uart_port_info *pdata = up->dev->platform_data;
218
219 if (!pdata || !pdata->set_noidle)
220 return;
221
222 pdata->set_noidle(up->dev);
223 }
224
225 static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable)
226 {
227 struct omap_uart_port_info *pdata = up->dev->platform_data;
228
229 if (!pdata || !pdata->enable_wakeup)
230 return;
231
232 pdata->enable_wakeup(up->dev, enable);
233 }
234
235 /*
236 * serial_omap_baud_is_mode16 - check if baud rate is MODE16X
237 * @port: uart port info
238 * @baud: baudrate for which mode needs to be determined
239 *
240 * Returns true if baud rate is MODE16X and false if MODE13X
241 * Original table in OMAP TRM named "UART Mode Baud Rates, Divisor Values,
242 * and Error Rates" determines modes not for all common baud rates.
243 * E.g. for 1000000 baud rate mode must be 16x, but according to that
244 * table it's determined as 13x.
245 */
246 static bool
247 serial_omap_baud_is_mode16(struct uart_port *port, unsigned int baud)
248 {
249 unsigned int n13 = port->uartclk / (13 * baud);
250 unsigned int n16 = port->uartclk / (16 * baud);
251 int baudAbsDiff13 = baud - (port->uartclk / (13 * n13));
252 int baudAbsDiff16 = baud - (port->uartclk / (16 * n16));
253 if(baudAbsDiff13 < 0)
254 baudAbsDiff13 = -baudAbsDiff13;
255 if(baudAbsDiff16 < 0)
256 baudAbsDiff16 = -baudAbsDiff16;
257
258 return (baudAbsDiff13 > baudAbsDiff16);
259 }
260
261 /*
262 * serial_omap_get_divisor - calculate divisor value
263 * @port: uart port info
264 * @baud: baudrate for which divisor needs to be calculated.
265 */
266 static unsigned int
267 serial_omap_get_divisor(struct uart_port *port, unsigned int baud)
268 {
269 unsigned int divisor;
270
271 if (!serial_omap_baud_is_mode16(port, baud))
272 divisor = 13;
273 else
274 divisor = 16;
275 return port->uartclk/(baud * divisor);
276 }
277
278 static void serial_omap_enable_ms(struct uart_port *port)
279 {
280 struct uart_omap_port *up = to_uart_omap_port(port);
281
282 dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line);
283
284 pm_runtime_get_sync(up->dev);
285 up->ier |= UART_IER_MSI;
286 serial_out(up, UART_IER, up->ier);
287 pm_runtime_mark_last_busy(up->dev);
288 pm_runtime_put_autosuspend(up->dev);
289 }
290
291 static void serial_omap_stop_tx(struct uart_port *port)
292 {
293 struct uart_omap_port *up = to_uart_omap_port(port);
294
295 pm_runtime_get_sync(up->dev);
296 if (up->ier & UART_IER_THRI) {
297 up->ier &= ~UART_IER_THRI;
298 serial_out(up, UART_IER, up->ier);
299 }
300
301 serial_omap_set_forceidle(up);
302
303 pm_runtime_mark_last_busy(up->dev);
304 pm_runtime_put_autosuspend(up->dev);
305 }
306
307 static void serial_omap_stop_rx(struct uart_port *port)
308 {
309 struct uart_omap_port *up = to_uart_omap_port(port);
310
311 pm_runtime_get_sync(up->dev);
312 up->ier &= ~UART_IER_RLSI;
313 up->port.read_status_mask &= ~UART_LSR_DR;
314 serial_out(up, UART_IER, up->ier);
315 pm_runtime_mark_last_busy(up->dev);
316 pm_runtime_put_autosuspend(up->dev);
317 }
318
319 static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
320 {
321 struct circ_buf *xmit = &up->port.state->xmit;
322 int count;
323
324 if (up->port.x_char) {
325 serial_out(up, UART_TX, up->port.x_char);
326 up->port.icount.tx++;
327 up->port.x_char = 0;
328 return;
329 }
330 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
331 serial_omap_stop_tx(&up->port);
332 return;
333 }
334 count = up->port.fifosize / 4;
335 do {
336 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
337 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
338 up->port.icount.tx++;
339 if (uart_circ_empty(xmit))
340 break;
341 } while (--count > 0);
342
343 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
344 spin_unlock(&up->port.lock);
345 uart_write_wakeup(&up->port);
346 spin_lock(&up->port.lock);
347 }
348
349 if (uart_circ_empty(xmit))
350 serial_omap_stop_tx(&up->port);
351 }
352
353 static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
354 {
355 if (!(up->ier & UART_IER_THRI)) {
356 up->ier |= UART_IER_THRI;
357 serial_out(up, UART_IER, up->ier);
358 }
359 }
360
361 static void serial_omap_start_tx(struct uart_port *port)
362 {
363 struct uart_omap_port *up = to_uart_omap_port(port);
364
365 pm_runtime_get_sync(up->dev);
366 serial_omap_enable_ier_thri(up);
367 serial_omap_set_noidle(up);
368 pm_runtime_mark_last_busy(up->dev);
369 pm_runtime_put_autosuspend(up->dev);
370 }
371
372 static void serial_omap_throttle(struct uart_port *port)
373 {
374 struct uart_omap_port *up = to_uart_omap_port(port);
375 unsigned long flags;
376
377 pm_runtime_get_sync(up->dev);
378 spin_lock_irqsave(&up->port.lock, flags);
379 up->ier &= ~(UART_IER_RLSI | UART_IER_RDI);
380 serial_out(up, UART_IER, up->ier);
381 spin_unlock_irqrestore(&up->port.lock, flags);
382 pm_runtime_mark_last_busy(up->dev);
383 pm_runtime_put_autosuspend(up->dev);
384 }
385
386 static void serial_omap_unthrottle(struct uart_port *port)
387 {
388 struct uart_omap_port *up = to_uart_omap_port(port);
389 unsigned long flags;
390
391 pm_runtime_get_sync(up->dev);
392 spin_lock_irqsave(&up->port.lock, flags);
393 up->ier |= UART_IER_RLSI | UART_IER_RDI;
394 serial_out(up, UART_IER, up->ier);
395 spin_unlock_irqrestore(&up->port.lock, flags);
396 pm_runtime_mark_last_busy(up->dev);
397 pm_runtime_put_autosuspend(up->dev);
398 }
399
400 static unsigned int check_modem_status(struct uart_omap_port *up)
401 {
402 unsigned int status;
403
404 status = serial_in(up, UART_MSR);
405 status |= up->msr_saved_flags;
406 up->msr_saved_flags = 0;
407 if ((status & UART_MSR_ANY_DELTA) == 0)
408 return status;
409
410 if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
411 up->port.state != NULL) {
412 if (status & UART_MSR_TERI)
413 up->port.icount.rng++;
414 if (status & UART_MSR_DDSR)
415 up->port.icount.dsr++;
416 if (status & UART_MSR_DDCD)
417 uart_handle_dcd_change
418 (&up->port, status & UART_MSR_DCD);
419 if (status & UART_MSR_DCTS)
420 uart_handle_cts_change
421 (&up->port, status & UART_MSR_CTS);
422 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
423 }
424
425 return status;
426 }
427
428 static void serial_omap_rlsi(struct uart_omap_port *up, unsigned int lsr)
429 {
430 unsigned int flag;
431 unsigned char ch = 0;
432
433 if (likely(lsr & UART_LSR_DR))
434 ch = serial_in(up, UART_RX);
435
436 up->port.icount.rx++;
437 flag = TTY_NORMAL;
438
439 if (lsr & UART_LSR_BI) {
440 flag = TTY_BREAK;
441 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
442 up->port.icount.brk++;
443 /*
444 * We do the SysRQ and SAK checking
445 * here because otherwise the break
446 * may get masked by ignore_status_mask
447 * or read_status_mask.
448 */
449 if (uart_handle_break(&up->port))
450 return;
451
452 }
453
454 if (lsr & UART_LSR_PE) {
455 flag = TTY_PARITY;
456 up->port.icount.parity++;
457 }
458
459 if (lsr & UART_LSR_FE) {
460 flag = TTY_FRAME;
461 up->port.icount.frame++;
462 }
463
464 if (lsr & UART_LSR_OE)
465 up->port.icount.overrun++;
466
467 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
468 if (up->port.line == up->port.cons->index) {
469 /* Recover the break flag from console xmit */
470 lsr |= up->lsr_break_flag;
471 }
472 #endif
473 uart_insert_char(&up->port, lsr, UART_LSR_OE, 0, flag);
474 }
475
476 static void serial_omap_rdi(struct uart_omap_port *up, unsigned int lsr)
477 {
478 unsigned char ch = 0;
479 unsigned int flag;
480
481 if (!(lsr & UART_LSR_DR))
482 return;
483
484 ch = serial_in(up, UART_RX);
485 flag = TTY_NORMAL;
486 up->port.icount.rx++;
487
488 if (uart_handle_sysrq_char(&up->port, ch))
489 return;
490
491 uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
492 }
493
494 /**
495 * serial_omap_irq() - This handles the interrupt from one port
496 * @irq: uart port irq number
497 * @dev_id: uart port info
498 */
499 static irqreturn_t serial_omap_irq(int irq, void *dev_id)
500 {
501 struct uart_omap_port *up = dev_id;
502 unsigned int iir, lsr;
503 unsigned int type;
504 irqreturn_t ret = IRQ_NONE;
505 int max_count = 256;
506
507 spin_lock(&up->port.lock);
508 pm_runtime_get_sync(up->dev);
509
510 do {
511 iir = serial_in(up, UART_IIR);
512 if (iir & UART_IIR_NO_INT)
513 break;
514
515 ret = IRQ_HANDLED;
516 lsr = serial_in(up, UART_LSR);
517
518 /* extract IRQ type from IIR register */
519 type = iir & 0x3e;
520
521 switch (type) {
522 case UART_IIR_MSI:
523 check_modem_status(up);
524 break;
525 case UART_IIR_THRI:
526 transmit_chars(up, lsr);
527 break;
528 case UART_IIR_RX_TIMEOUT:
529 /* FALLTHROUGH */
530 case UART_IIR_RDI:
531 serial_omap_rdi(up, lsr);
532 break;
533 case UART_IIR_RLSI:
534 serial_omap_rlsi(up, lsr);
535 break;
536 case UART_IIR_CTS_RTS_DSR:
537 /* simply try again */
538 break;
539 case UART_IIR_XOFF:
540 /* FALLTHROUGH */
541 default:
542 break;
543 }
544 } while (!(iir & UART_IIR_NO_INT) && max_count--);
545
546 spin_unlock(&up->port.lock);
547
548 tty_flip_buffer_push(&up->port.state->port);
549
550 pm_runtime_mark_last_busy(up->dev);
551 pm_runtime_put_autosuspend(up->dev);
552 up->port_activity = jiffies;
553
554 return ret;
555 }
556
557 static unsigned int serial_omap_tx_empty(struct uart_port *port)
558 {
559 struct uart_omap_port *up = to_uart_omap_port(port);
560 unsigned long flags = 0;
561 unsigned int ret = 0;
562
563 pm_runtime_get_sync(up->dev);
564 dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->port.line);
565 spin_lock_irqsave(&up->port.lock, flags);
566 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
567 spin_unlock_irqrestore(&up->port.lock, flags);
568 pm_runtime_mark_last_busy(up->dev);
569 pm_runtime_put_autosuspend(up->dev);
570 return ret;
571 }
572
573 static unsigned int serial_omap_get_mctrl(struct uart_port *port)
574 {
575 struct uart_omap_port *up = to_uart_omap_port(port);
576 unsigned int status;
577 unsigned int ret = 0;
578
579 pm_runtime_get_sync(up->dev);
580 status = check_modem_status(up);
581 pm_runtime_mark_last_busy(up->dev);
582 pm_runtime_put_autosuspend(up->dev);
583
584 dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->port.line);
585
586 if (status & UART_MSR_DCD)
587 ret |= TIOCM_CAR;
588 if (status & UART_MSR_RI)
589 ret |= TIOCM_RNG;
590 if (status & UART_MSR_DSR)
591 ret |= TIOCM_DSR;
592 if (status & UART_MSR_CTS)
593 ret |= TIOCM_CTS;
594 return ret;
595 }
596
597 static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
598 {
599 struct uart_omap_port *up = to_uart_omap_port(port);
600 unsigned char mcr = 0, old_mcr;
601
602 dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->port.line);
603 if (mctrl & TIOCM_RTS)
604 mcr |= UART_MCR_RTS;
605 if (mctrl & TIOCM_DTR)
606 mcr |= UART_MCR_DTR;
607 if (mctrl & TIOCM_OUT1)
608 mcr |= UART_MCR_OUT1;
609 if (mctrl & TIOCM_OUT2)
610 mcr |= UART_MCR_OUT2;
611 if (mctrl & TIOCM_LOOP)
612 mcr |= UART_MCR_LOOP;
613
614 pm_runtime_get_sync(up->dev);
615 old_mcr = serial_in(up, UART_MCR);
616 old_mcr &= ~(UART_MCR_LOOP | UART_MCR_OUT2 | UART_MCR_OUT1 |
617 UART_MCR_DTR | UART_MCR_RTS);
618 up->mcr = old_mcr | mcr;
619 serial_out(up, UART_MCR, up->mcr);
620 pm_runtime_mark_last_busy(up->dev);
621 pm_runtime_put_autosuspend(up->dev);
622
623 if (gpio_is_valid(up->DTR_gpio) &&
624 !!(mctrl & TIOCM_DTR) != up->DTR_active) {
625 up->DTR_active = !up->DTR_active;
626 if (gpio_cansleep(up->DTR_gpio))
627 schedule_work(&up->qos_work);
628 else
629 gpio_set_value(up->DTR_gpio,
630 up->DTR_active != up->DTR_inverted);
631 }
632 }
633
634 static void serial_omap_break_ctl(struct uart_port *port, int break_state)
635 {
636 struct uart_omap_port *up = to_uart_omap_port(port);
637 unsigned long flags = 0;
638
639 dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line);
640 pm_runtime_get_sync(up->dev);
641 spin_lock_irqsave(&up->port.lock, flags);
642 if (break_state == -1)
643 up->lcr |= UART_LCR_SBC;
644 else
645 up->lcr &= ~UART_LCR_SBC;
646 serial_out(up, UART_LCR, up->lcr);
647 spin_unlock_irqrestore(&up->port.lock, flags);
648 pm_runtime_mark_last_busy(up->dev);
649 pm_runtime_put_autosuspend(up->dev);
650 }
651
652 static int serial_omap_startup(struct uart_port *port)
653 {
654 struct uart_omap_port *up = to_uart_omap_port(port);
655 unsigned long flags = 0;
656 int retval;
657
658 /*
659 * Allocate the IRQ
660 */
661 retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags,
662 up->name, up);
663 if (retval)
664 return retval;
665
666 dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line);
667
668 pm_runtime_get_sync(up->dev);
669 /*
670 * Clear the FIFO buffers and disable them.
671 * (they will be reenabled in set_termios())
672 */
673 serial_omap_clear_fifos(up);
674 /* For Hardware flow control */
675 serial_out(up, UART_MCR, UART_MCR_RTS);
676
677 /*
678 * Clear the interrupt registers.
679 */
680 (void) serial_in(up, UART_LSR);
681 if (serial_in(up, UART_LSR) & UART_LSR_DR)
682 (void) serial_in(up, UART_RX);
683 (void) serial_in(up, UART_IIR);
684 (void) serial_in(up, UART_MSR);
685
686 /*
687 * Now, initialize the UART
688 */
689 serial_out(up, UART_LCR, UART_LCR_WLEN8);
690 spin_lock_irqsave(&up->port.lock, flags);
691 /*
692 * Most PC uarts need OUT2 raised to enable interrupts.
693 */
694 up->port.mctrl |= TIOCM_OUT2;
695 serial_omap_set_mctrl(&up->port, up->port.mctrl);
696 spin_unlock_irqrestore(&up->port.lock, flags);
697
698 up->msr_saved_flags = 0;
699 /*
700 * Finally, enable interrupts. Note: Modem status interrupts
701 * are set via set_termios(), which will be occurring imminently
702 * anyway, so we don't enable them here.
703 */
704 up->ier = UART_IER_RLSI | UART_IER_RDI;
705 serial_out(up, UART_IER, up->ier);
706
707 /* Enable module level wake up */
708 serial_out(up, UART_OMAP_WER, OMAP_UART_WER_MOD_WKUP);
709
710 pm_runtime_mark_last_busy(up->dev);
711 pm_runtime_put_autosuspend(up->dev);
712 up->port_activity = jiffies;
713 return 0;
714 }
715
716 static void serial_omap_shutdown(struct uart_port *port)
717 {
718 struct uart_omap_port *up = to_uart_omap_port(port);
719 unsigned long flags = 0;
720
721 dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->port.line);
722
723 pm_runtime_get_sync(up->dev);
724 /*
725 * Disable interrupts from this port
726 */
727 up->ier = 0;
728 serial_out(up, UART_IER, 0);
729
730 spin_lock_irqsave(&up->port.lock, flags);
731 up->port.mctrl &= ~TIOCM_OUT2;
732 serial_omap_set_mctrl(&up->port, up->port.mctrl);
733 spin_unlock_irqrestore(&up->port.lock, flags);
734
735 /*
736 * Disable break condition and FIFOs
737 */
738 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
739 serial_omap_clear_fifos(up);
740
741 /*
742 * Read data port to reset things, and then free the irq
743 */
744 if (serial_in(up, UART_LSR) & UART_LSR_DR)
745 (void) serial_in(up, UART_RX);
746
747 pm_runtime_mark_last_busy(up->dev);
748 pm_runtime_put_autosuspend(up->dev);
749 free_irq(up->port.irq, up);
750 }
751
752 static void serial_omap_uart_qos_work(struct work_struct *work)
753 {
754 struct uart_omap_port *up = container_of(work, struct uart_omap_port,
755 qos_work);
756
757 pm_qos_update_request(&up->pm_qos_request, up->latency);
758 if (gpio_is_valid(up->DTR_gpio))
759 gpio_set_value_cansleep(up->DTR_gpio,
760 up->DTR_active != up->DTR_inverted);
761 }
762
763 static void
764 serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
765 struct ktermios *old)
766 {
767 struct uart_omap_port *up = to_uart_omap_port(port);
768 unsigned char cval = 0;
769 unsigned long flags = 0;
770 unsigned int baud, quot;
771
772 switch (termios->c_cflag & CSIZE) {
773 case CS5:
774 cval = UART_LCR_WLEN5;
775 break;
776 case CS6:
777 cval = UART_LCR_WLEN6;
778 break;
779 case CS7:
780 cval = UART_LCR_WLEN7;
781 break;
782 default:
783 case CS8:
784 cval = UART_LCR_WLEN8;
785 break;
786 }
787
788 if (termios->c_cflag & CSTOPB)
789 cval |= UART_LCR_STOP;
790 if (termios->c_cflag & PARENB)
791 cval |= UART_LCR_PARITY;
792 if (!(termios->c_cflag & PARODD))
793 cval |= UART_LCR_EPAR;
794 if (termios->c_cflag & CMSPAR)
795 cval |= UART_LCR_SPAR;
796
797 /*
798 * Ask the core to calculate the divisor for us.
799 */
800
801 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13);
802 quot = serial_omap_get_divisor(port, baud);
803
804 /* calculate wakeup latency constraint */
805 up->calc_latency = (USEC_PER_SEC * up->port.fifosize) / (baud / 8);
806 up->latency = up->calc_latency;
807 schedule_work(&up->qos_work);
808
809 up->dll = quot & 0xff;
810 up->dlh = quot >> 8;
811 up->mdr1 = UART_OMAP_MDR1_DISABLE;
812
813 up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 |
814 UART_FCR_ENABLE_FIFO;
815
816 /*
817 * Ok, we're now changing the port state. Do it with
818 * interrupts disabled.
819 */
820 pm_runtime_get_sync(up->dev);
821 spin_lock_irqsave(&up->port.lock, flags);
822
823 /*
824 * Update the per-port timeout.
825 */
826 uart_update_timeout(port, termios->c_cflag, baud);
827
828 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
829 if (termios->c_iflag & INPCK)
830 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
831 if (termios->c_iflag & (BRKINT | PARMRK))
832 up->port.read_status_mask |= UART_LSR_BI;
833
834 /*
835 * Characters to ignore
836 */
837 up->port.ignore_status_mask = 0;
838 if (termios->c_iflag & IGNPAR)
839 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
840 if (termios->c_iflag & IGNBRK) {
841 up->port.ignore_status_mask |= UART_LSR_BI;
842 /*
843 * If we're ignoring parity and break indicators,
844 * ignore overruns too (for real raw support).
845 */
846 if (termios->c_iflag & IGNPAR)
847 up->port.ignore_status_mask |= UART_LSR_OE;
848 }
849
850 /*
851 * ignore all characters if CREAD is not set
852 */
853 if ((termios->c_cflag & CREAD) == 0)
854 up->port.ignore_status_mask |= UART_LSR_DR;
855
856 /*
857 * Modem status interrupts
858 */
859 up->ier &= ~UART_IER_MSI;
860 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
861 up->ier |= UART_IER_MSI;
862 serial_out(up, UART_IER, up->ier);
863 serial_out(up, UART_LCR, cval); /* reset DLAB */
864 up->lcr = cval;
865 up->scr = 0;
866
867 /* FIFOs and DMA Settings */
868
869 /* FCR can be changed only when the
870 * baud clock is not running
871 * DLL_REG and DLH_REG set to 0.
872 */
873 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
874 serial_out(up, UART_DLL, 0);
875 serial_out(up, UART_DLM, 0);
876 serial_out(up, UART_LCR, 0);
877
878 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
879
880 up->efr = serial_in(up, UART_EFR) & ~UART_EFR_ECB;
881 up->efr &= ~UART_EFR_SCD;
882 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
883
884 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
885 up->mcr = serial_in(up, UART_MCR) & ~UART_MCR_TCRTLR;
886 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
887 /* FIFO ENABLE, DMA MODE */
888
889 up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK;
890 /*
891 * NOTE: Setting OMAP_UART_SCR_RX_TRIG_GRANU1_MASK
892 * sets Enables the granularity of 1 for TRIGGER RX
893 * level. Along with setting RX FIFO trigger level
894 * to 1 (as noted below, 16 characters) and TLR[3:0]
895 * to zero this will result RX FIFO threshold level
896 * to 1 character, instead of 16 as noted in comment
897 * below.
898 */
899
900 /* Set receive FIFO threshold to 16 characters and
901 * transmit FIFO threshold to 16 spaces
902 */
903 up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK;
904 up->fcr &= ~OMAP_UART_FCR_TX_FIFO_TRIG_MASK;
905 up->fcr |= UART_FCR6_R_TRIGGER_16 | UART_FCR6_T_TRIGGER_24 |
906 UART_FCR_ENABLE_FIFO;
907
908 serial_out(up, UART_FCR, up->fcr);
909 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
910
911 serial_out(up, UART_OMAP_SCR, up->scr);
912
913 /* Reset UART_MCR_TCRTLR: this must be done with the EFR_ECB bit set */
914 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
915 serial_out(up, UART_MCR, up->mcr);
916 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
917 serial_out(up, UART_EFR, up->efr);
918 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
919
920 /* Protocol, Baud Rate, and Interrupt Settings */
921
922 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
923 serial_omap_mdr1_errataset(up, up->mdr1);
924 else
925 serial_out(up, UART_OMAP_MDR1, up->mdr1);
926
927 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
928 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
929
930 serial_out(up, UART_LCR, 0);
931 serial_out(up, UART_IER, 0);
932 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
933
934 serial_out(up, UART_DLL, up->dll); /* LS of divisor */
935 serial_out(up, UART_DLM, up->dlh); /* MS of divisor */
936
937 serial_out(up, UART_LCR, 0);
938 serial_out(up, UART_IER, up->ier);
939 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
940
941 serial_out(up, UART_EFR, up->efr);
942 serial_out(up, UART_LCR, cval);
943
944 if (!serial_omap_baud_is_mode16(port, baud))
945 up->mdr1 = UART_OMAP_MDR1_13X_MODE;
946 else
947 up->mdr1 = UART_OMAP_MDR1_16X_MODE;
948
949 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
950 serial_omap_mdr1_errataset(up, up->mdr1);
951 else
952 serial_out(up, UART_OMAP_MDR1, up->mdr1);
953
954 /* Configure flow control */
955 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
956
957 /* XON1/XOFF1 accessible mode B, TCRTLR=0, ECB=0 */
958 serial_out(up, UART_XON1, termios->c_cc[VSTART]);
959 serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]);
960
961 /* Enable access to TCR/TLR */
962 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
963 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
964 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
965
966 serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
967
968 if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) {
969 /* Enable AUTORTS and AUTOCTS */
970 up->efr |= UART_EFR_CTS | UART_EFR_RTS;
971
972 /* Ensure MCR RTS is asserted */
973 up->mcr |= UART_MCR_RTS;
974 } else {
975 /* Disable AUTORTS and AUTOCTS */
976 up->efr &= ~(UART_EFR_CTS | UART_EFR_RTS);
977 }
978
979 if (up->port.flags & UPF_SOFT_FLOW) {
980 /* clear SW control mode bits */
981 up->efr &= OMAP_UART_SW_CLR;
982
983 /*
984 * IXON Flag:
985 * Enable XON/XOFF flow control on input.
986 * Receiver compares XON1, XOFF1.
987 */
988 if (termios->c_iflag & IXON)
989 up->efr |= OMAP_UART_SW_RX;
990
991 /*
992 * IXOFF Flag:
993 * Enable XON/XOFF flow control on output.
994 * Transmit XON1, XOFF1
995 */
996 if (termios->c_iflag & IXOFF)
997 up->efr |= OMAP_UART_SW_TX;
998
999 /*
1000 * IXANY Flag:
1001 * Enable any character to restart output.
1002 * Operation resumes after receiving any
1003 * character after recognition of the XOFF character
1004 */
1005 if (termios->c_iflag & IXANY)
1006 up->mcr |= UART_MCR_XONANY;
1007 else
1008 up->mcr &= ~UART_MCR_XONANY;
1009 }
1010 serial_out(up, UART_MCR, up->mcr);
1011 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1012 serial_out(up, UART_EFR, up->efr);
1013 serial_out(up, UART_LCR, up->lcr);
1014
1015 serial_omap_set_mctrl(&up->port, up->port.mctrl);
1016
1017 spin_unlock_irqrestore(&up->port.lock, flags);
1018 pm_runtime_mark_last_busy(up->dev);
1019 pm_runtime_put_autosuspend(up->dev);
1020 dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line);
1021 }
1022
1023 static int serial_omap_set_wake(struct uart_port *port, unsigned int state)
1024 {
1025 struct uart_omap_port *up = to_uart_omap_port(port);
1026
1027 serial_omap_enable_wakeup(up, state);
1028
1029 return 0;
1030 }
1031
1032 static void
1033 serial_omap_pm(struct uart_port *port, unsigned int state,
1034 unsigned int oldstate)
1035 {
1036 struct uart_omap_port *up = to_uart_omap_port(port);
1037 unsigned char efr;
1038
1039 dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line);
1040
1041 pm_runtime_get_sync(up->dev);
1042 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1043 efr = serial_in(up, UART_EFR);
1044 serial_out(up, UART_EFR, efr | UART_EFR_ECB);
1045 serial_out(up, UART_LCR, 0);
1046
1047 serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0);
1048 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
1049 serial_out(up, UART_EFR, efr);
1050 serial_out(up, UART_LCR, 0);
1051
1052 if (!device_may_wakeup(up->dev)) {
1053 if (!state)
1054 pm_runtime_forbid(up->dev);
1055 else
1056 pm_runtime_allow(up->dev);
1057 }
1058
1059 pm_runtime_mark_last_busy(up->dev);
1060 pm_runtime_put_autosuspend(up->dev);
1061 }
1062
1063 static void serial_omap_release_port(struct uart_port *port)
1064 {
1065 dev_dbg(port->dev, "serial_omap_release_port+\n");
1066 }
1067
1068 static int serial_omap_request_port(struct uart_port *port)
1069 {
1070 dev_dbg(port->dev, "serial_omap_request_port+\n");
1071 return 0;
1072 }
1073
1074 static void serial_omap_config_port(struct uart_port *port, int flags)
1075 {
1076 struct uart_omap_port *up = to_uart_omap_port(port);
1077
1078 dev_dbg(up->port.dev, "serial_omap_config_port+%d\n",
1079 up->port.line);
1080 up->port.type = PORT_OMAP;
1081 up->port.flags |= UPF_SOFT_FLOW | UPF_HARD_FLOW;
1082 }
1083
1084 static int
1085 serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser)
1086 {
1087 /* we don't want the core code to modify any port params */
1088 dev_dbg(port->dev, "serial_omap_verify_port+\n");
1089 return -EINVAL;
1090 }
1091
1092 static const char *
1093 serial_omap_type(struct uart_port *port)
1094 {
1095 struct uart_omap_port *up = to_uart_omap_port(port);
1096
1097 dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->port.line);
1098 return up->name;
1099 }
1100
1101 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
1102
1103 static inline void wait_for_xmitr(struct uart_omap_port *up)
1104 {
1105 unsigned int status, tmout = 10000;
1106
1107 /* Wait up to 10ms for the character(s) to be sent. */
1108 do {
1109 status = serial_in(up, UART_LSR);
1110
1111 if (status & UART_LSR_BI)
1112 up->lsr_break_flag = UART_LSR_BI;
1113
1114 if (--tmout == 0)
1115 break;
1116 udelay(1);
1117 } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
1118
1119 /* Wait up to 1s for flow control if necessary */
1120 if (up->port.flags & UPF_CONS_FLOW) {
1121 tmout = 1000000;
1122 for (tmout = 1000000; tmout; tmout--) {
1123 unsigned int msr = serial_in(up, UART_MSR);
1124
1125 up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
1126 if (msr & UART_MSR_CTS)
1127 break;
1128
1129 udelay(1);
1130 }
1131 }
1132 }
1133
1134 #ifdef CONFIG_CONSOLE_POLL
1135
1136 static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch)
1137 {
1138 struct uart_omap_port *up = to_uart_omap_port(port);
1139
1140 pm_runtime_get_sync(up->dev);
1141 wait_for_xmitr(up);
1142 serial_out(up, UART_TX, ch);
1143 pm_runtime_mark_last_busy(up->dev);
1144 pm_runtime_put_autosuspend(up->dev);
1145 }
1146
1147 static int serial_omap_poll_get_char(struct uart_port *port)
1148 {
1149 struct uart_omap_port *up = to_uart_omap_port(port);
1150 unsigned int status;
1151
1152 pm_runtime_get_sync(up->dev);
1153 status = serial_in(up, UART_LSR);
1154 if (!(status & UART_LSR_DR)) {
1155 status = NO_POLL_CHAR;
1156 goto out;
1157 }
1158
1159 status = serial_in(up, UART_RX);
1160
1161 out:
1162 pm_runtime_mark_last_busy(up->dev);
1163 pm_runtime_put_autosuspend(up->dev);
1164
1165 return status;
1166 }
1167
1168 #endif /* CONFIG_CONSOLE_POLL */
1169
1170 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
1171
1172 static struct uart_omap_port *serial_omap_console_ports[OMAP_MAX_HSUART_PORTS];
1173
1174 static struct uart_driver serial_omap_reg;
1175
1176 static void serial_omap_console_putchar(struct uart_port *port, int ch)
1177 {
1178 struct uart_omap_port *up = to_uart_omap_port(port);
1179
1180 wait_for_xmitr(up);
1181 serial_out(up, UART_TX, ch);
1182 }
1183
1184 static void
1185 serial_omap_console_write(struct console *co, const char *s,
1186 unsigned int count)
1187 {
1188 struct uart_omap_port *up = serial_omap_console_ports[co->index];
1189 unsigned long flags;
1190 unsigned int ier;
1191 int locked = 1;
1192
1193 pm_runtime_get_sync(up->dev);
1194
1195 local_irq_save(flags);
1196 if (up->port.sysrq)
1197 locked = 0;
1198 else if (oops_in_progress)
1199 locked = spin_trylock(&up->port.lock);
1200 else
1201 spin_lock(&up->port.lock);
1202
1203 /*
1204 * First save the IER then disable the interrupts
1205 */
1206 ier = serial_in(up, UART_IER);
1207 serial_out(up, UART_IER, 0);
1208
1209 uart_console_write(&up->port, s, count, serial_omap_console_putchar);
1210
1211 /*
1212 * Finally, wait for transmitter to become empty
1213 * and restore the IER
1214 */
1215 wait_for_xmitr(up);
1216 serial_out(up, UART_IER, ier);
1217 /*
1218 * The receive handling will happen properly because the
1219 * receive ready bit will still be set; it is not cleared
1220 * on read. However, modem control will not, we must
1221 * call it if we have saved something in the saved flags
1222 * while processing with interrupts off.
1223 */
1224 if (up->msr_saved_flags)
1225 check_modem_status(up);
1226
1227 pm_runtime_mark_last_busy(up->dev);
1228 pm_runtime_put_autosuspend(up->dev);
1229 if (locked)
1230 spin_unlock(&up->port.lock);
1231 local_irq_restore(flags);
1232 }
1233
1234 static int __init
1235 serial_omap_console_setup(struct console *co, char *options)
1236 {
1237 struct uart_omap_port *up;
1238 int baud = 115200;
1239 int bits = 8;
1240 int parity = 'n';
1241 int flow = 'n';
1242
1243 if (serial_omap_console_ports[co->index] == NULL)
1244 return -ENODEV;
1245 up = serial_omap_console_ports[co->index];
1246
1247 if (options)
1248 uart_parse_options(options, &baud, &parity, &bits, &flow);
1249
1250 return uart_set_options(&up->port, co, baud, parity, bits, flow);
1251 }
1252
1253 static struct console serial_omap_console = {
1254 .name = OMAP_SERIAL_NAME,
1255 .write = serial_omap_console_write,
1256 .device = uart_console_device,
1257 .setup = serial_omap_console_setup,
1258 .flags = CON_PRINTBUFFER,
1259 .index = -1,
1260 .data = &serial_omap_reg,
1261 };
1262
1263 static void serial_omap_add_console_port(struct uart_omap_port *up)
1264 {
1265 serial_omap_console_ports[up->port.line] = up;
1266 }
1267
1268 #define OMAP_CONSOLE (&serial_omap_console)
1269
1270 #else
1271
1272 #define OMAP_CONSOLE NULL
1273
1274 static inline void serial_omap_add_console_port(struct uart_omap_port *up)
1275 {}
1276
1277 #endif
1278
1279 static struct uart_ops serial_omap_pops = {
1280 .tx_empty = serial_omap_tx_empty,
1281 .set_mctrl = serial_omap_set_mctrl,
1282 .get_mctrl = serial_omap_get_mctrl,
1283 .stop_tx = serial_omap_stop_tx,
1284 .start_tx = serial_omap_start_tx,
1285 .throttle = serial_omap_throttle,
1286 .unthrottle = serial_omap_unthrottle,
1287 .stop_rx = serial_omap_stop_rx,
1288 .enable_ms = serial_omap_enable_ms,
1289 .break_ctl = serial_omap_break_ctl,
1290 .startup = serial_omap_startup,
1291 .shutdown = serial_omap_shutdown,
1292 .set_termios = serial_omap_set_termios,
1293 .pm = serial_omap_pm,
1294 .set_wake = serial_omap_set_wake,
1295 .type = serial_omap_type,
1296 .release_port = serial_omap_release_port,
1297 .request_port = serial_omap_request_port,
1298 .config_port = serial_omap_config_port,
1299 .verify_port = serial_omap_verify_port,
1300 #ifdef CONFIG_CONSOLE_POLL
1301 .poll_put_char = serial_omap_poll_put_char,
1302 .poll_get_char = serial_omap_poll_get_char,
1303 #endif
1304 };
1305
1306 static struct uart_driver serial_omap_reg = {
1307 .owner = THIS_MODULE,
1308 .driver_name = "OMAP-SERIAL",
1309 .dev_name = OMAP_SERIAL_NAME,
1310 .nr = OMAP_MAX_HSUART_PORTS,
1311 .cons = OMAP_CONSOLE,
1312 };
1313
1314 #ifdef CONFIG_PM_SLEEP
1315 static int serial_omap_suspend(struct device *dev)
1316 {
1317 struct uart_omap_port *up = dev_get_drvdata(dev);
1318
1319 uart_suspend_port(&serial_omap_reg, &up->port);
1320 flush_work(&up->qos_work);
1321
1322 return 0;
1323 }
1324
1325 static int serial_omap_resume(struct device *dev)
1326 {
1327 struct uart_omap_port *up = dev_get_drvdata(dev);
1328
1329 uart_resume_port(&serial_omap_reg, &up->port);
1330
1331 return 0;
1332 }
1333 #endif
1334
1335 static void omap_serial_fill_features_erratas(struct uart_omap_port *up)
1336 {
1337 u32 mvr, scheme;
1338 u16 revision, major, minor;
1339
1340 mvr = serial_in(up, UART_OMAP_MVER);
1341
1342 /* Check revision register scheme */
1343 scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT;
1344
1345 switch (scheme) {
1346 case 0: /* Legacy Scheme: OMAP2/3 */
1347 /* MINOR_REV[0:4], MAJOR_REV[4:7] */
1348 major = (mvr & OMAP_UART_LEGACY_MVR_MAJ_MASK) >>
1349 OMAP_UART_LEGACY_MVR_MAJ_SHIFT;
1350 minor = (mvr & OMAP_UART_LEGACY_MVR_MIN_MASK);
1351 break;
1352 case 1:
1353 /* New Scheme: OMAP4+ */
1354 /* MINOR_REV[0:5], MAJOR_REV[8:10] */
1355 major = (mvr & OMAP_UART_MVR_MAJ_MASK) >>
1356 OMAP_UART_MVR_MAJ_SHIFT;
1357 minor = (mvr & OMAP_UART_MVR_MIN_MASK);
1358 break;
1359 default:
1360 dev_warn(up->dev,
1361 "Unknown %s revision, defaulting to highest\n",
1362 up->name);
1363 /* highest possible revision */
1364 major = 0xff;
1365 minor = 0xff;
1366 }
1367
1368 /* normalize revision for the driver */
1369 revision = UART_BUILD_REVISION(major, minor);
1370
1371 switch (revision) {
1372 case OMAP_UART_REV_46:
1373 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1374 UART_ERRATA_i291_DMA_FORCEIDLE);
1375 break;
1376 case OMAP_UART_REV_52:
1377 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1378 UART_ERRATA_i291_DMA_FORCEIDLE);
1379 break;
1380 case OMAP_UART_REV_63:
1381 up->errata |= UART_ERRATA_i202_MDR1_ACCESS;
1382 break;
1383 default:
1384 break;
1385 }
1386 }
1387
1388 static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev)
1389 {
1390 struct omap_uart_port_info *omap_up_info;
1391
1392 omap_up_info = devm_kzalloc(dev, sizeof(*omap_up_info), GFP_KERNEL);
1393 if (!omap_up_info)
1394 return NULL; /* out of memory */
1395
1396 of_property_read_u32(dev->of_node, "clock-frequency",
1397 &omap_up_info->uartclk);
1398 return omap_up_info;
1399 }
1400
1401 static int serial_omap_probe(struct platform_device *pdev)
1402 {
1403 struct uart_omap_port *up;
1404 struct resource *mem, *irq;
1405 struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data;
1406 int ret;
1407
1408 if (pdev->dev.of_node)
1409 omap_up_info = of_get_uart_port_info(&pdev->dev);
1410
1411 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1412 if (!mem) {
1413 dev_err(&pdev->dev, "no mem resource?\n");
1414 return -ENODEV;
1415 }
1416
1417 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1418 if (!irq) {
1419 dev_err(&pdev->dev, "no irq resource?\n");
1420 return -ENODEV;
1421 }
1422
1423 if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem),
1424 pdev->dev.driver->name)) {
1425 dev_err(&pdev->dev, "memory region already claimed\n");
1426 return -EBUSY;
1427 }
1428
1429 if (gpio_is_valid(omap_up_info->DTR_gpio) &&
1430 omap_up_info->DTR_present) {
1431 ret = gpio_request(omap_up_info->DTR_gpio, "omap-serial");
1432 if (ret < 0)
1433 return ret;
1434 ret = gpio_direction_output(omap_up_info->DTR_gpio,
1435 omap_up_info->DTR_inverted);
1436 if (ret < 0)
1437 return ret;
1438 }
1439
1440 up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL);
1441 if (!up)
1442 return -ENOMEM;
1443
1444 if (gpio_is_valid(omap_up_info->DTR_gpio) &&
1445 omap_up_info->DTR_present) {
1446 up->DTR_gpio = omap_up_info->DTR_gpio;
1447 up->DTR_inverted = omap_up_info->DTR_inverted;
1448 } else
1449 up->DTR_gpio = -EINVAL;
1450 up->DTR_active = 0;
1451
1452 up->dev = &pdev->dev;
1453 up->port.dev = &pdev->dev;
1454 up->port.type = PORT_OMAP;
1455 up->port.iotype = UPIO_MEM;
1456 up->port.irq = irq->start;
1457
1458 up->port.regshift = 2;
1459 up->port.fifosize = 64;
1460 up->port.ops = &serial_omap_pops;
1461
1462 if (pdev->dev.of_node)
1463 up->port.line = of_alias_get_id(pdev->dev.of_node, "serial");
1464 else
1465 up->port.line = pdev->id;
1466
1467 if (up->port.line < 0) {
1468 dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n",
1469 up->port.line);
1470 ret = -ENODEV;
1471 goto err_port_line;
1472 }
1473
1474 up->pins = devm_pinctrl_get_select_default(&pdev->dev);
1475 if (IS_ERR(up->pins)) {
1476 dev_warn(&pdev->dev, "did not get pins for uart%i error: %li\n",
1477 up->port.line, PTR_ERR(up->pins));
1478 up->pins = NULL;
1479 }
1480
1481 sprintf(up->name, "OMAP UART%d", up->port.line);
1482 up->port.mapbase = mem->start;
1483 up->port.membase = devm_ioremap(&pdev->dev, mem->start,
1484 resource_size(mem));
1485 if (!up->port.membase) {
1486 dev_err(&pdev->dev, "can't ioremap UART\n");
1487 ret = -ENOMEM;
1488 goto err_ioremap;
1489 }
1490
1491 up->port.flags = omap_up_info->flags;
1492 up->port.uartclk = omap_up_info->uartclk;
1493 if (!up->port.uartclk) {
1494 up->port.uartclk = DEFAULT_CLK_SPEED;
1495 dev_warn(&pdev->dev, "No clock speed specified: using default:"
1496 "%d\n", DEFAULT_CLK_SPEED);
1497 }
1498
1499 up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1500 up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1501 pm_qos_add_request(&up->pm_qos_request,
1502 PM_QOS_CPU_DMA_LATENCY, up->latency);
1503 serial_omap_uart_wq = create_singlethread_workqueue(up->name);
1504 INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
1505
1506 platform_set_drvdata(pdev, up);
1507 pm_runtime_enable(&pdev->dev);
1508 pm_runtime_use_autosuspend(&pdev->dev);
1509 pm_runtime_set_autosuspend_delay(&pdev->dev,
1510 omap_up_info->autosuspend_timeout);
1511
1512 pm_runtime_irq_safe(&pdev->dev);
1513 pm_runtime_get_sync(&pdev->dev);
1514
1515 omap_serial_fill_features_erratas(up);
1516
1517 ui[up->port.line] = up;
1518 serial_omap_add_console_port(up);
1519
1520 ret = uart_add_one_port(&serial_omap_reg, &up->port);
1521 if (ret != 0)
1522 goto err_add_port;
1523
1524 pm_runtime_mark_last_busy(up->dev);
1525 pm_runtime_put_autosuspend(up->dev);
1526 return 0;
1527
1528 err_add_port:
1529 pm_runtime_put(&pdev->dev);
1530 pm_runtime_disable(&pdev->dev);
1531 err_ioremap:
1532 err_port_line:
1533 dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n",
1534 pdev->id, __func__, ret);
1535 return ret;
1536 }
1537
1538 static int serial_omap_remove(struct platform_device *dev)
1539 {
1540 struct uart_omap_port *up = platform_get_drvdata(dev);
1541
1542 pm_runtime_put_sync(up->dev);
1543 pm_runtime_disable(up->dev);
1544 uart_remove_one_port(&serial_omap_reg, &up->port);
1545 pm_qos_remove_request(&up->pm_qos_request);
1546
1547 return 0;
1548 }
1549
1550 /*
1551 * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460)
1552 * The access to uart register after MDR1 Access
1553 * causes UART to corrupt data.
1554 *
1555 * Need a delay =
1556 * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS)
1557 * give 10 times as much
1558 */
1559 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1)
1560 {
1561 u8 timeout = 255;
1562
1563 serial_out(up, UART_OMAP_MDR1, mdr1);
1564 udelay(2);
1565 serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT |
1566 UART_FCR_CLEAR_RCVR);
1567 /*
1568 * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and
1569 * TX_FIFO_E bit is 1.
1570 */
1571 while (UART_LSR_THRE != (serial_in(up, UART_LSR) &
1572 (UART_LSR_THRE | UART_LSR_DR))) {
1573 timeout--;
1574 if (!timeout) {
1575 /* Should *never* happen. we warn and carry on */
1576 dev_crit(up->dev, "Errata i202: timedout %x\n",
1577 serial_in(up, UART_LSR));
1578 break;
1579 }
1580 udelay(1);
1581 }
1582 }
1583
1584 #ifdef CONFIG_PM_RUNTIME
1585 static void serial_omap_restore_context(struct uart_omap_port *up)
1586 {
1587 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1588 serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE);
1589 else
1590 serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE);
1591
1592 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1593 serial_out(up, UART_EFR, UART_EFR_ECB);
1594 serial_out(up, UART_LCR, 0x0); /* Operational mode */
1595 serial_out(up, UART_IER, 0x0);
1596 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1597 serial_out(up, UART_DLL, up->dll);
1598 serial_out(up, UART_DLM, up->dlh);
1599 serial_out(up, UART_LCR, 0x0); /* Operational mode */
1600 serial_out(up, UART_IER, up->ier);
1601 serial_out(up, UART_FCR, up->fcr);
1602 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
1603 serial_out(up, UART_MCR, up->mcr);
1604 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1605 serial_out(up, UART_OMAP_SCR, up->scr);
1606 serial_out(up, UART_EFR, up->efr);
1607 serial_out(up, UART_LCR, up->lcr);
1608 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1609 serial_omap_mdr1_errataset(up, up->mdr1);
1610 else
1611 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1612 }
1613
1614 static int serial_omap_runtime_suspend(struct device *dev)
1615 {
1616 struct uart_omap_port *up = dev_get_drvdata(dev);
1617 struct omap_uart_port_info *pdata = dev->platform_data;
1618
1619 if (!up)
1620 return -EINVAL;
1621
1622 if (!pdata)
1623 return 0;
1624
1625 up->context_loss_cnt = serial_omap_get_context_loss_count(up);
1626
1627 if (device_may_wakeup(dev)) {
1628 if (!up->wakeups_enabled) {
1629 serial_omap_enable_wakeup(up, true);
1630 up->wakeups_enabled = true;
1631 }
1632 } else {
1633 if (up->wakeups_enabled) {
1634 serial_omap_enable_wakeup(up, false);
1635 up->wakeups_enabled = false;
1636 }
1637 }
1638
1639 up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1640 schedule_work(&up->qos_work);
1641
1642 return 0;
1643 }
1644
1645 static int serial_omap_runtime_resume(struct device *dev)
1646 {
1647 struct uart_omap_port *up = dev_get_drvdata(dev);
1648
1649 int loss_cnt = serial_omap_get_context_loss_count(up);
1650
1651 if (loss_cnt < 0) {
1652 dev_err(dev, "serial_omap_get_context_loss_count failed : %d\n",
1653 loss_cnt);
1654 serial_omap_restore_context(up);
1655 } else if (up->context_loss_cnt != loss_cnt) {
1656 serial_omap_restore_context(up);
1657 }
1658 up->latency = up->calc_latency;
1659 schedule_work(&up->qos_work);
1660
1661 return 0;
1662 }
1663 #endif
1664
1665 static const struct dev_pm_ops serial_omap_dev_pm_ops = {
1666 SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume)
1667 SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend,
1668 serial_omap_runtime_resume, NULL)
1669 };
1670
1671 #if defined(CONFIG_OF)
1672 static const struct of_device_id omap_serial_of_match[] = {
1673 { .compatible = "ti,omap2-uart" },
1674 { .compatible = "ti,omap3-uart" },
1675 { .compatible = "ti,omap4-uart" },
1676 {},
1677 };
1678 MODULE_DEVICE_TABLE(of, omap_serial_of_match);
1679 #endif
1680
1681 static struct platform_driver serial_omap_driver = {
1682 .probe = serial_omap_probe,
1683 .remove = serial_omap_remove,
1684 .driver = {
1685 .name = DRIVER_NAME,
1686 .pm = &serial_omap_dev_pm_ops,
1687 .of_match_table = of_match_ptr(omap_serial_of_match),
1688 },
1689 };
1690
1691 static int __init serial_omap_init(void)
1692 {
1693 int ret;
1694
1695 ret = uart_register_driver(&serial_omap_reg);
1696 if (ret != 0)
1697 return ret;
1698 ret = platform_driver_register(&serial_omap_driver);
1699 if (ret != 0)
1700 uart_unregister_driver(&serial_omap_reg);
1701 return ret;
1702 }
1703
1704 static void __exit serial_omap_exit(void)
1705 {
1706 platform_driver_unregister(&serial_omap_driver);
1707 uart_unregister_driver(&serial_omap_reg);
1708 }
1709
1710 module_init(serial_omap_init);
1711 module_exit(serial_omap_exit);
1712
1713 MODULE_DESCRIPTION("OMAP High Speed UART driver");
1714 MODULE_LICENSE("GPL");
1715 MODULE_AUTHOR("Texas Instruments Inc");
kernel source for telekom puls (alcatel/mediatek)