2 * Driver for OMAP-UART controller.
3 * Based on drivers/serial/8250.c
5 * Copyright (C) 2010 Texas Instruments.
8 * Govindraj R <govindraj.raja@ti.com>
9 * Thara Gopinath <thara@ti.com>
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.
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.
23 #if defined(CONFIG_SERIAL_OMAP_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
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>
37 #include <linux/clk.h>
38 #include <linux/serial_core.h>
39 #include <linux/irq.h>
40 #include <linux/pm_runtime.h>
42 #include <linux/gpio.h>
43 #include <linux/pinctrl/consumer.h>
45 #include <plat/omap-serial.h>
47 #define UART_BUILD_REVISION(x, y) (((x) << 8) | (y))
49 #define OMAP_UART_REV_42 0x0402
50 #define OMAP_UART_REV_46 0x0406
51 #define OMAP_UART_REV_52 0x0502
52 #define OMAP_UART_REV_63 0x0603
54 #define DEFAULT_CLK_SPEED 48000000 /* 48Mhz*/
56 /* SCR register bitmasks */
57 #define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK (1 << 7)
59 /* FCR register bitmasks */
60 #define OMAP_UART_FCR_RX_FIFO_TRIG_MASK (0x3 << 6)
61 #define OMAP_UART_FCR_TX_FIFO_TRIG_MASK (0x3 << 4)
63 /* MVR register bitmasks */
64 #define OMAP_UART_MVR_SCHEME_SHIFT 30
66 #define OMAP_UART_LEGACY_MVR_MAJ_MASK 0xf0
67 #define OMAP_UART_LEGACY_MVR_MAJ_SHIFT 4
68 #define OMAP_UART_LEGACY_MVR_MIN_MASK 0x0f
70 #define OMAP_UART_MVR_MAJ_MASK 0x700
71 #define OMAP_UART_MVR_MAJ_SHIFT 8
72 #define OMAP_UART_MVR_MIN_MASK 0x3f
74 struct uart_omap_port {
75 struct uart_port port;
76 struct uart_omap_dma uart_dma;
91 * Some bits in registers are cleared on a read, so they must
92 * be saved whenever the register is read but the bits will not
93 * be immediately processed.
95 unsigned int lsr_break_flag;
96 unsigned char msr_saved_flags;
98 unsigned long port_activity;
102 unsigned int irq_pending:1;
108 struct pm_qos_request pm_qos_request;
111 struct work_struct qos_work;
112 struct pinctrl *pins;
115 #define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port)))
117 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
119 /* Forward declaration of functions */
120 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1);
122 static struct workqueue_struct *serial_omap_uart_wq;
124 static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
126 offset <<= up->port.regshift;
127 return readw(up->port.membase + offset);
130 static inline void serial_out(struct uart_omap_port *up, int offset, int value)
132 offset <<= up->port.regshift;
133 writew(value, up->port.membase + offset);
136 static inline void serial_omap_clear_fifos(struct uart_omap_port *up)
138 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
139 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
140 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
141 serial_out(up, UART_FCR, 0);
144 static int serial_omap_get_context_loss_count(struct uart_omap_port *up)
146 struct omap_uart_port_info *pdata = up->dev->platform_data;
148 if (!pdata || !pdata->get_context_loss_count)
151 return pdata->get_context_loss_count(up->dev);
154 static void serial_omap_set_forceidle(struct uart_omap_port *up)
156 struct omap_uart_port_info *pdata = up->dev->platform_data;
158 if (!pdata || !pdata->set_forceidle)
161 pdata->set_forceidle(up->dev);
164 static void serial_omap_set_noidle(struct uart_omap_port *up)
166 struct omap_uart_port_info *pdata = up->dev->platform_data;
168 if (!pdata || !pdata->set_noidle)
171 pdata->set_noidle(up->dev);
174 static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable)
176 struct omap_uart_port_info *pdata = up->dev->platform_data;
178 if (!pdata || !pdata->enable_wakeup)
181 pdata->enable_wakeup(up->dev, enable);
185 * serial_omap_get_divisor - calculate divisor value
186 * @port: uart port info
187 * @baud: baudrate for which divisor needs to be calculated.
189 * We have written our own function to get the divisor so as to support
190 * 13x mode. 3Mbps Baudrate as an different divisor.
191 * Reference OMAP TRM Chapter 17:
192 * Table 17-1. UART Mode Baud Rates, Divisor Values, and Error Rates
193 * referring to oversampling - divisor value
194 * baudrate 460,800 to 3,686,400 all have divisor 13
195 * except 3,000,000 which has divisor value 16
198 serial_omap_get_divisor(struct uart_port *port, unsigned int baud)
200 unsigned int divisor;
202 if (baud > OMAP_MODE13X_SPEED && baud != 3000000)
206 return port->uartclk/(baud * divisor);
209 static void serial_omap_enable_ms(struct uart_port *port)
211 struct uart_omap_port *up = to_uart_omap_port(port);
213 dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line);
215 pm_runtime_get_sync(up->dev);
216 up->ier |= UART_IER_MSI;
217 serial_out(up, UART_IER, up->ier);
218 pm_runtime_mark_last_busy(up->dev);
219 pm_runtime_put_autosuspend(up->dev);
222 static void serial_omap_stop_tx(struct uart_port *port)
224 struct uart_omap_port *up = to_uart_omap_port(port);
226 pm_runtime_get_sync(up->dev);
227 if (up->ier & UART_IER_THRI) {
228 up->ier &= ~UART_IER_THRI;
229 serial_out(up, UART_IER, up->ier);
232 serial_omap_set_forceidle(up);
234 pm_runtime_mark_last_busy(up->dev);
235 pm_runtime_put_autosuspend(up->dev);
238 static void serial_omap_stop_rx(struct uart_port *port)
240 struct uart_omap_port *up = to_uart_omap_port(port);
242 pm_runtime_get_sync(up->dev);
243 up->ier &= ~UART_IER_RLSI;
244 up->port.read_status_mask &= ~UART_LSR_DR;
245 serial_out(up, UART_IER, up->ier);
246 pm_runtime_mark_last_busy(up->dev);
247 pm_runtime_put_autosuspend(up->dev);
250 static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
252 struct circ_buf *xmit = &up->port.state->xmit;
255 if (!(lsr & UART_LSR_THRE))
258 if (up->port.x_char) {
259 serial_out(up, UART_TX, up->port.x_char);
260 up->port.icount.tx++;
264 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
265 serial_omap_stop_tx(&up->port);
268 count = up->port.fifosize / 4;
270 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
271 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
272 up->port.icount.tx++;
273 if (uart_circ_empty(xmit))
275 } while (--count > 0);
277 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
278 spin_unlock(&up->port.lock);
279 uart_write_wakeup(&up->port);
280 spin_lock(&up->port.lock);
283 if (uart_circ_empty(xmit))
284 serial_omap_stop_tx(&up->port);
287 static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
289 if (!(up->ier & UART_IER_THRI)) {
290 up->ier |= UART_IER_THRI;
291 serial_out(up, UART_IER, up->ier);
295 static void serial_omap_start_tx(struct uart_port *port)
297 struct uart_omap_port *up = to_uart_omap_port(port);
299 pm_runtime_get_sync(up->dev);
300 serial_omap_enable_ier_thri(up);
301 serial_omap_set_noidle(up);
302 pm_runtime_mark_last_busy(up->dev);
303 pm_runtime_put_autosuspend(up->dev);
306 static unsigned int check_modem_status(struct uart_omap_port *up)
310 status = serial_in(up, UART_MSR);
311 status |= up->msr_saved_flags;
312 up->msr_saved_flags = 0;
313 if ((status & UART_MSR_ANY_DELTA) == 0)
316 if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
317 up->port.state != NULL) {
318 if (status & UART_MSR_TERI)
319 up->port.icount.rng++;
320 if (status & UART_MSR_DDSR)
321 up->port.icount.dsr++;
322 if (status & UART_MSR_DDCD)
323 uart_handle_dcd_change
324 (&up->port, status & UART_MSR_DCD);
325 if (status & UART_MSR_DCTS)
326 uart_handle_cts_change
327 (&up->port, status & UART_MSR_CTS);
328 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
334 static void serial_omap_rlsi(struct uart_omap_port *up, unsigned int lsr)
337 unsigned char ch = 0;
339 if (likely(lsr & UART_LSR_DR))
340 ch = serial_in(up, UART_RX);
342 up->port.icount.rx++;
345 if (lsr & UART_LSR_BI) {
347 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
348 up->port.icount.brk++;
350 * We do the SysRQ and SAK checking
351 * here because otherwise the break
352 * may get masked by ignore_status_mask
353 * or read_status_mask.
355 if (uart_handle_break(&up->port))
360 if (lsr & UART_LSR_PE) {
362 up->port.icount.parity++;
365 if (lsr & UART_LSR_FE) {
367 up->port.icount.frame++;
370 if (lsr & UART_LSR_OE)
371 up->port.icount.overrun++;
373 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
374 if (up->port.line == up->port.cons->index) {
375 /* Recover the break flag from console xmit */
376 lsr |= up->lsr_break_flag;
379 uart_insert_char(&up->port, lsr, UART_LSR_OE, 0, flag);
382 static void serial_omap_rdi(struct uart_omap_port *up, unsigned int lsr)
384 unsigned char ch = 0;
387 if (!(lsr & UART_LSR_DR))
390 ch = serial_in(up, UART_RX);
392 up->port.icount.rx++;
394 if (uart_handle_sysrq_char(&up->port, ch))
397 uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
401 * serial_omap_irq() - This handles the interrupt from one port
402 * @irq: uart port irq number
403 * @dev_id: uart port info
405 static irqreturn_t serial_omap_irq(int irq, void *dev_id)
407 struct uart_omap_port *up = dev_id;
408 struct tty_struct *tty = up->port.state->port.tty;
409 unsigned int iir, lsr;
411 irqreturn_t ret = IRQ_NONE;
414 spin_lock(&up->port.lock);
415 pm_runtime_get_sync(up->dev);
418 iir = serial_in(up, UART_IIR);
419 if (iir & UART_IIR_NO_INT)
423 lsr = serial_in(up, UART_LSR);
425 /* extract IRQ type from IIR register */
430 check_modem_status(up);
433 transmit_chars(up, lsr);
435 case UART_IIR_RX_TIMEOUT:
438 serial_omap_rdi(up, lsr);
441 serial_omap_rlsi(up, lsr);
443 case UART_IIR_CTS_RTS_DSR:
444 /* simply try again */
451 } while (!(iir & UART_IIR_NO_INT) && max_count--);
453 spin_unlock(&up->port.lock);
455 tty_flip_buffer_push(tty);
457 pm_runtime_mark_last_busy(up->dev);
458 pm_runtime_put_autosuspend(up->dev);
459 up->port_activity = jiffies;
464 static unsigned int serial_omap_tx_empty(struct uart_port *port)
466 struct uart_omap_port *up = to_uart_omap_port(port);
467 unsigned long flags = 0;
468 unsigned int ret = 0;
470 pm_runtime_get_sync(up->dev);
471 dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->port.line);
472 spin_lock_irqsave(&up->port.lock, flags);
473 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
474 spin_unlock_irqrestore(&up->port.lock, flags);
475 pm_runtime_mark_last_busy(up->dev);
476 pm_runtime_put_autosuspend(up->dev);
480 static unsigned int serial_omap_get_mctrl(struct uart_port *port)
482 struct uart_omap_port *up = to_uart_omap_port(port);
484 unsigned int ret = 0;
486 pm_runtime_get_sync(up->dev);
487 status = check_modem_status(up);
488 pm_runtime_mark_last_busy(up->dev);
489 pm_runtime_put_autosuspend(up->dev);
491 dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->port.line);
493 if (status & UART_MSR_DCD)
495 if (status & UART_MSR_RI)
497 if (status & UART_MSR_DSR)
499 if (status & UART_MSR_CTS)
504 static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
506 struct uart_omap_port *up = to_uart_omap_port(port);
507 unsigned char mcr = 0;
509 dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->port.line);
510 if (mctrl & TIOCM_RTS)
512 if (mctrl & TIOCM_DTR)
514 if (mctrl & TIOCM_OUT1)
515 mcr |= UART_MCR_OUT1;
516 if (mctrl & TIOCM_OUT2)
517 mcr |= UART_MCR_OUT2;
518 if (mctrl & TIOCM_LOOP)
519 mcr |= UART_MCR_LOOP;
521 pm_runtime_get_sync(up->dev);
522 up->mcr = serial_in(up, UART_MCR);
524 serial_out(up, UART_MCR, up->mcr);
525 pm_runtime_mark_last_busy(up->dev);
526 pm_runtime_put_autosuspend(up->dev);
528 if (gpio_is_valid(up->DTR_gpio) &&
529 !!(mctrl & TIOCM_DTR) != up->DTR_active) {
530 up->DTR_active = !up->DTR_active;
531 if (gpio_cansleep(up->DTR_gpio))
532 schedule_work(&up->qos_work);
534 gpio_set_value(up->DTR_gpio,
535 up->DTR_active != up->DTR_inverted);
539 static void serial_omap_break_ctl(struct uart_port *port, int break_state)
541 struct uart_omap_port *up = to_uart_omap_port(port);
542 unsigned long flags = 0;
544 dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line);
545 pm_runtime_get_sync(up->dev);
546 spin_lock_irqsave(&up->port.lock, flags);
547 if (break_state == -1)
548 up->lcr |= UART_LCR_SBC;
550 up->lcr &= ~UART_LCR_SBC;
551 serial_out(up, UART_LCR, up->lcr);
552 spin_unlock_irqrestore(&up->port.lock, flags);
553 pm_runtime_mark_last_busy(up->dev);
554 pm_runtime_put_autosuspend(up->dev);
557 static int serial_omap_startup(struct uart_port *port)
559 struct uart_omap_port *up = to_uart_omap_port(port);
560 unsigned long flags = 0;
566 retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags,
571 dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line);
573 pm_runtime_get_sync(up->dev);
575 * Clear the FIFO buffers and disable them.
576 * (they will be reenabled in set_termios())
578 serial_omap_clear_fifos(up);
579 /* For Hardware flow control */
580 serial_out(up, UART_MCR, UART_MCR_RTS);
583 * Clear the interrupt registers.
585 (void) serial_in(up, UART_LSR);
586 if (serial_in(up, UART_LSR) & UART_LSR_DR)
587 (void) serial_in(up, UART_RX);
588 (void) serial_in(up, UART_IIR);
589 (void) serial_in(up, UART_MSR);
592 * Now, initialize the UART
594 serial_out(up, UART_LCR, UART_LCR_WLEN8);
595 spin_lock_irqsave(&up->port.lock, flags);
597 * Most PC uarts need OUT2 raised to enable interrupts.
599 up->port.mctrl |= TIOCM_OUT2;
600 serial_omap_set_mctrl(&up->port, up->port.mctrl);
601 spin_unlock_irqrestore(&up->port.lock, flags);
603 up->msr_saved_flags = 0;
605 * Finally, enable interrupts. Note: Modem status interrupts
606 * are set via set_termios(), which will be occurring imminently
607 * anyway, so we don't enable them here.
609 up->ier = UART_IER_RLSI | UART_IER_RDI;
610 serial_out(up, UART_IER, up->ier);
612 /* Enable module level wake up */
613 serial_out(up, UART_OMAP_WER, OMAP_UART_WER_MOD_WKUP);
615 pm_runtime_mark_last_busy(up->dev);
616 pm_runtime_put_autosuspend(up->dev);
617 up->port_activity = jiffies;
621 static void serial_omap_shutdown(struct uart_port *port)
623 struct uart_omap_port *up = to_uart_omap_port(port);
624 unsigned long flags = 0;
626 dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->port.line);
628 pm_runtime_get_sync(up->dev);
630 * Disable interrupts from this port
633 serial_out(up, UART_IER, 0);
635 spin_lock_irqsave(&up->port.lock, flags);
636 up->port.mctrl &= ~TIOCM_OUT2;
637 serial_omap_set_mctrl(&up->port, up->port.mctrl);
638 spin_unlock_irqrestore(&up->port.lock, flags);
641 * Disable break condition and FIFOs
643 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
644 serial_omap_clear_fifos(up);
647 * Read data port to reset things, and then free the irq
649 if (serial_in(up, UART_LSR) & UART_LSR_DR)
650 (void) serial_in(up, UART_RX);
652 pm_runtime_mark_last_busy(up->dev);
653 pm_runtime_put_autosuspend(up->dev);
654 free_irq(up->port.irq, up);
658 serial_omap_configure_xonxoff
659 (struct uart_omap_port *up, struct ktermios *termios)
661 up->lcr = serial_in(up, UART_LCR);
662 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
663 up->efr = serial_in(up, UART_EFR);
664 serial_out(up, UART_EFR, up->efr & ~UART_EFR_ECB);
666 serial_out(up, UART_XON1, termios->c_cc[VSTART]);
667 serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]);
669 /* clear SW control mode bits */
670 up->efr &= OMAP_UART_SW_CLR;
674 * Flow control for OMAP.TX
675 * OMAP.RX should listen for XON/XOFF
677 if (termios->c_iflag & IXON)
678 up->efr |= OMAP_UART_SW_RX;
682 * Flow control for OMAP.RX
683 * OMAP.TX should send XON/XOFF
685 if (termios->c_iflag & IXOFF)
686 up->efr |= OMAP_UART_SW_TX;
688 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
689 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
691 up->mcr = serial_in(up, UART_MCR);
695 * Enable any character to restart output.
696 * Operation resumes after receiving any
697 * character after recognition of the XOFF character
699 if (termios->c_iflag & IXANY)
700 up->mcr |= UART_MCR_XONANY;
702 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
703 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
704 serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
705 /* Enable special char function UARTi.EFR_REG[5] and
706 * load the new software flow control mode IXON or IXOFF
707 * and restore the UARTi.EFR_REG[4] ENHANCED_EN value.
709 serial_out(up, UART_EFR, up->efr | UART_EFR_SCD);
710 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
712 serial_out(up, UART_MCR, up->mcr & ~UART_MCR_TCRTLR);
713 serial_out(up, UART_LCR, up->lcr);
716 static void serial_omap_uart_qos_work(struct work_struct *work)
718 struct uart_omap_port *up = container_of(work, struct uart_omap_port,
721 pm_qos_update_request(&up->pm_qos_request, up->latency);
722 if (gpio_is_valid(up->DTR_gpio))
723 gpio_set_value_cansleep(up->DTR_gpio,
724 up->DTR_active != up->DTR_inverted);
728 serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
729 struct ktermios *old)
731 struct uart_omap_port *up = to_uart_omap_port(port);
732 unsigned char cval = 0;
733 unsigned char efr = 0;
734 unsigned long flags = 0;
735 unsigned int baud, quot;
737 switch (termios->c_cflag & CSIZE) {
739 cval = UART_LCR_WLEN5;
742 cval = UART_LCR_WLEN6;
745 cval = UART_LCR_WLEN7;
749 cval = UART_LCR_WLEN8;
753 if (termios->c_cflag & CSTOPB)
754 cval |= UART_LCR_STOP;
755 if (termios->c_cflag & PARENB)
756 cval |= UART_LCR_PARITY;
757 if (!(termios->c_cflag & PARODD))
758 cval |= UART_LCR_EPAR;
761 * Ask the core to calculate the divisor for us.
764 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13);
765 quot = serial_omap_get_divisor(port, baud);
767 /* calculate wakeup latency constraint */
768 up->calc_latency = (USEC_PER_SEC * up->port.fifosize) / (baud / 8);
769 up->latency = up->calc_latency;
770 schedule_work(&up->qos_work);
772 up->dll = quot & 0xff;
774 up->mdr1 = UART_OMAP_MDR1_DISABLE;
776 up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 |
777 UART_FCR_ENABLE_FIFO;
780 * Ok, we're now changing the port state. Do it with
781 * interrupts disabled.
783 pm_runtime_get_sync(up->dev);
784 spin_lock_irqsave(&up->port.lock, flags);
787 * Update the per-port timeout.
789 uart_update_timeout(port, termios->c_cflag, baud);
791 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
792 if (termios->c_iflag & INPCK)
793 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
794 if (termios->c_iflag & (BRKINT | PARMRK))
795 up->port.read_status_mask |= UART_LSR_BI;
798 * Characters to ignore
800 up->port.ignore_status_mask = 0;
801 if (termios->c_iflag & IGNPAR)
802 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
803 if (termios->c_iflag & IGNBRK) {
804 up->port.ignore_status_mask |= UART_LSR_BI;
806 * If we're ignoring parity and break indicators,
807 * ignore overruns too (for real raw support).
809 if (termios->c_iflag & IGNPAR)
810 up->port.ignore_status_mask |= UART_LSR_OE;
814 * ignore all characters if CREAD is not set
816 if ((termios->c_cflag & CREAD) == 0)
817 up->port.ignore_status_mask |= UART_LSR_DR;
820 * Modem status interrupts
822 up->ier &= ~UART_IER_MSI;
823 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
824 up->ier |= UART_IER_MSI;
825 serial_out(up, UART_IER, up->ier);
826 serial_out(up, UART_LCR, cval); /* reset DLAB */
828 up->scr = OMAP_UART_SCR_TX_EMPTY;
830 /* FIFOs and DMA Settings */
832 /* FCR can be changed only when the
833 * baud clock is not running
834 * DLL_REG and DLH_REG set to 0.
836 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
837 serial_out(up, UART_DLL, 0);
838 serial_out(up, UART_DLM, 0);
839 serial_out(up, UART_LCR, 0);
841 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
843 up->efr = serial_in(up, UART_EFR);
844 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
846 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
847 up->mcr = serial_in(up, UART_MCR);
848 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
849 /* FIFO ENABLE, DMA MODE */
851 up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK;
853 /* Set receive FIFO threshold to 16 characters and
854 * transmit FIFO threshold to 16 spaces
856 up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK;
857 up->fcr &= ~OMAP_UART_FCR_TX_FIFO_TRIG_MASK;
858 up->fcr |= UART_FCR6_R_TRIGGER_16 | UART_FCR6_T_TRIGGER_24 |
859 UART_FCR_ENABLE_FIFO;
861 serial_out(up, UART_FCR, up->fcr);
862 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
864 serial_out(up, UART_OMAP_SCR, up->scr);
866 serial_out(up, UART_EFR, up->efr);
867 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
868 serial_out(up, UART_MCR, up->mcr);
870 /* Protocol, Baud Rate, and Interrupt Settings */
872 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
873 serial_omap_mdr1_errataset(up, up->mdr1);
875 serial_out(up, UART_OMAP_MDR1, up->mdr1);
877 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
879 up->efr = serial_in(up, UART_EFR);
880 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
882 serial_out(up, UART_LCR, 0);
883 serial_out(up, UART_IER, 0);
884 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
886 serial_out(up, UART_DLL, up->dll); /* LS of divisor */
887 serial_out(up, UART_DLM, up->dlh); /* MS of divisor */
889 serial_out(up, UART_LCR, 0);
890 serial_out(up, UART_IER, up->ier);
891 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
893 serial_out(up, UART_EFR, up->efr);
894 serial_out(up, UART_LCR, cval);
896 if (baud > 230400 && baud != 3000000)
897 up->mdr1 = UART_OMAP_MDR1_13X_MODE;
899 up->mdr1 = UART_OMAP_MDR1_16X_MODE;
901 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
902 serial_omap_mdr1_errataset(up, up->mdr1);
904 serial_out(up, UART_OMAP_MDR1, up->mdr1);
906 /* Hardware Flow Control Configuration */
908 if (termios->c_cflag & CRTSCTS) {
909 efr |= (UART_EFR_CTS | UART_EFR_RTS);
910 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
912 up->mcr = serial_in(up, UART_MCR);
913 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
915 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
916 up->efr = serial_in(up, UART_EFR);
917 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
919 serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
920 serial_out(up, UART_EFR, efr); /* Enable AUTORTS and AUTOCTS */
921 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
922 serial_out(up, UART_MCR, up->mcr | UART_MCR_RTS);
923 serial_out(up, UART_LCR, cval);
926 serial_omap_set_mctrl(&up->port, up->port.mctrl);
927 /* Software Flow Control Configuration */
928 serial_omap_configure_xonxoff(up, termios);
930 spin_unlock_irqrestore(&up->port.lock, flags);
931 pm_runtime_mark_last_busy(up->dev);
932 pm_runtime_put_autosuspend(up->dev);
933 dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line);
936 static int serial_omap_set_wake(struct uart_port *port, unsigned int state)
938 struct uart_omap_port *up = to_uart_omap_port(port);
940 serial_omap_enable_wakeup(up, state);
946 serial_omap_pm(struct uart_port *port, unsigned int state,
947 unsigned int oldstate)
949 struct uart_omap_port *up = to_uart_omap_port(port);
952 dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line);
954 pm_runtime_get_sync(up->dev);
955 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
956 efr = serial_in(up, UART_EFR);
957 serial_out(up, UART_EFR, efr | UART_EFR_ECB);
958 serial_out(up, UART_LCR, 0);
960 serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0);
961 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
962 serial_out(up, UART_EFR, efr);
963 serial_out(up, UART_LCR, 0);
965 if (!device_may_wakeup(up->dev)) {
967 pm_runtime_forbid(up->dev);
969 pm_runtime_allow(up->dev);
972 pm_runtime_mark_last_busy(up->dev);
973 pm_runtime_put_autosuspend(up->dev);
976 static void serial_omap_release_port(struct uart_port *port)
978 dev_dbg(port->dev, "serial_omap_release_port+\n");
981 static int serial_omap_request_port(struct uart_port *port)
983 dev_dbg(port->dev, "serial_omap_request_port+\n");
987 static void serial_omap_config_port(struct uart_port *port, int flags)
989 struct uart_omap_port *up = to_uart_omap_port(port);
991 dev_dbg(up->port.dev, "serial_omap_config_port+%d\n",
993 up->port.type = PORT_OMAP;
997 serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser)
999 /* we don't want the core code to modify any port params */
1000 dev_dbg(port->dev, "serial_omap_verify_port+\n");
1005 serial_omap_type(struct uart_port *port)
1007 struct uart_omap_port *up = to_uart_omap_port(port);
1009 dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->port.line);
1013 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
1015 static inline void wait_for_xmitr(struct uart_omap_port *up)
1017 unsigned int status, tmout = 10000;
1019 /* Wait up to 10ms for the character(s) to be sent. */
1021 status = serial_in(up, UART_LSR);
1023 if (status & UART_LSR_BI)
1024 up->lsr_break_flag = UART_LSR_BI;
1029 } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
1031 /* Wait up to 1s for flow control if necessary */
1032 if (up->port.flags & UPF_CONS_FLOW) {
1034 for (tmout = 1000000; tmout; tmout--) {
1035 unsigned int msr = serial_in(up, UART_MSR);
1037 up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
1038 if (msr & UART_MSR_CTS)
1046 #ifdef CONFIG_CONSOLE_POLL
1048 static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch)
1050 struct uart_omap_port *up = to_uart_omap_port(port);
1052 pm_runtime_get_sync(up->dev);
1054 serial_out(up, UART_TX, ch);
1055 pm_runtime_mark_last_busy(up->dev);
1056 pm_runtime_put_autosuspend(up->dev);
1059 static int serial_omap_poll_get_char(struct uart_port *port)
1061 struct uart_omap_port *up = to_uart_omap_port(port);
1062 unsigned int status;
1064 pm_runtime_get_sync(up->dev);
1065 status = serial_in(up, UART_LSR);
1066 if (!(status & UART_LSR_DR)) {
1067 status = NO_POLL_CHAR;
1071 status = serial_in(up, UART_RX);
1074 pm_runtime_mark_last_busy(up->dev);
1075 pm_runtime_put_autosuspend(up->dev);
1080 #endif /* CONFIG_CONSOLE_POLL */
1082 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
1084 static struct uart_omap_port *serial_omap_console_ports[4];
1086 static struct uart_driver serial_omap_reg;
1088 static void serial_omap_console_putchar(struct uart_port *port, int ch)
1090 struct uart_omap_port *up = to_uart_omap_port(port);
1093 serial_out(up, UART_TX, ch);
1097 serial_omap_console_write(struct console *co, const char *s,
1100 struct uart_omap_port *up = serial_omap_console_ports[co->index];
1101 unsigned long flags;
1105 pm_runtime_get_sync(up->dev);
1107 local_irq_save(flags);
1110 else if (oops_in_progress)
1111 locked = spin_trylock(&up->port.lock);
1113 spin_lock(&up->port.lock);
1116 * First save the IER then disable the interrupts
1118 ier = serial_in(up, UART_IER);
1119 serial_out(up, UART_IER, 0);
1121 uart_console_write(&up->port, s, count, serial_omap_console_putchar);
1124 * Finally, wait for transmitter to become empty
1125 * and restore the IER
1128 serial_out(up, UART_IER, ier);
1130 * The receive handling will happen properly because the
1131 * receive ready bit will still be set; it is not cleared
1132 * on read. However, modem control will not, we must
1133 * call it if we have saved something in the saved flags
1134 * while processing with interrupts off.
1136 if (up->msr_saved_flags)
1137 check_modem_status(up);
1139 pm_runtime_mark_last_busy(up->dev);
1140 pm_runtime_put_autosuspend(up->dev);
1142 spin_unlock(&up->port.lock);
1143 local_irq_restore(flags);
1147 serial_omap_console_setup(struct console *co, char *options)
1149 struct uart_omap_port *up;
1155 if (serial_omap_console_ports[co->index] == NULL)
1157 up = serial_omap_console_ports[co->index];
1160 uart_parse_options(options, &baud, &parity, &bits, &flow);
1162 return uart_set_options(&up->port, co, baud, parity, bits, flow);
1165 static struct console serial_omap_console = {
1166 .name = OMAP_SERIAL_NAME,
1167 .write = serial_omap_console_write,
1168 .device = uart_console_device,
1169 .setup = serial_omap_console_setup,
1170 .flags = CON_PRINTBUFFER,
1172 .data = &serial_omap_reg,
1175 static void serial_omap_add_console_port(struct uart_omap_port *up)
1177 serial_omap_console_ports[up->port.line] = up;
1180 #define OMAP_CONSOLE (&serial_omap_console)
1184 #define OMAP_CONSOLE NULL
1186 static inline void serial_omap_add_console_port(struct uart_omap_port *up)
1191 static struct uart_ops serial_omap_pops = {
1192 .tx_empty = serial_omap_tx_empty,
1193 .set_mctrl = serial_omap_set_mctrl,
1194 .get_mctrl = serial_omap_get_mctrl,
1195 .stop_tx = serial_omap_stop_tx,
1196 .start_tx = serial_omap_start_tx,
1197 .stop_rx = serial_omap_stop_rx,
1198 .enable_ms = serial_omap_enable_ms,
1199 .break_ctl = serial_omap_break_ctl,
1200 .startup = serial_omap_startup,
1201 .shutdown = serial_omap_shutdown,
1202 .set_termios = serial_omap_set_termios,
1203 .pm = serial_omap_pm,
1204 .set_wake = serial_omap_set_wake,
1205 .type = serial_omap_type,
1206 .release_port = serial_omap_release_port,
1207 .request_port = serial_omap_request_port,
1208 .config_port = serial_omap_config_port,
1209 .verify_port = serial_omap_verify_port,
1210 #ifdef CONFIG_CONSOLE_POLL
1211 .poll_put_char = serial_omap_poll_put_char,
1212 .poll_get_char = serial_omap_poll_get_char,
1216 static struct uart_driver serial_omap_reg = {
1217 .owner = THIS_MODULE,
1218 .driver_name = "OMAP-SERIAL",
1219 .dev_name = OMAP_SERIAL_NAME,
1220 .nr = OMAP_MAX_HSUART_PORTS,
1221 .cons = OMAP_CONSOLE,
1224 #ifdef CONFIG_PM_SLEEP
1225 static int serial_omap_suspend(struct device *dev)
1227 struct uart_omap_port *up = dev_get_drvdata(dev);
1229 uart_suspend_port(&serial_omap_reg, &up->port);
1230 flush_work(&up->qos_work);
1235 static int serial_omap_resume(struct device *dev)
1237 struct uart_omap_port *up = dev_get_drvdata(dev);
1239 uart_resume_port(&serial_omap_reg, &up->port);
1245 static void __devinit omap_serial_fill_features_erratas(struct uart_omap_port *up)
1248 u16 revision, major, minor;
1250 mvr = serial_in(up, UART_OMAP_MVER);
1252 /* Check revision register scheme */
1253 scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT;
1256 case 0: /* Legacy Scheme: OMAP2/3 */
1257 /* MINOR_REV[0:4], MAJOR_REV[4:7] */
1258 major = (mvr & OMAP_UART_LEGACY_MVR_MAJ_MASK) >>
1259 OMAP_UART_LEGACY_MVR_MAJ_SHIFT;
1260 minor = (mvr & OMAP_UART_LEGACY_MVR_MIN_MASK);
1263 /* New Scheme: OMAP4+ */
1264 /* MINOR_REV[0:5], MAJOR_REV[8:10] */
1265 major = (mvr & OMAP_UART_MVR_MAJ_MASK) >>
1266 OMAP_UART_MVR_MAJ_SHIFT;
1267 minor = (mvr & OMAP_UART_MVR_MIN_MASK);
1271 "Unknown %s revision, defaulting to highest\n",
1273 /* highest possible revision */
1278 /* normalize revision for the driver */
1279 revision = UART_BUILD_REVISION(major, minor);
1282 case OMAP_UART_REV_46:
1283 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1284 UART_ERRATA_i291_DMA_FORCEIDLE);
1286 case OMAP_UART_REV_52:
1287 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1288 UART_ERRATA_i291_DMA_FORCEIDLE);
1290 case OMAP_UART_REV_63:
1291 up->errata |= UART_ERRATA_i202_MDR1_ACCESS;
1298 static __devinit struct omap_uart_port_info *of_get_uart_port_info(struct device *dev)
1300 struct omap_uart_port_info *omap_up_info;
1302 omap_up_info = devm_kzalloc(dev, sizeof(*omap_up_info), GFP_KERNEL);
1304 return NULL; /* out of memory */
1306 of_property_read_u32(dev->of_node, "clock-frequency",
1307 &omap_up_info->uartclk);
1308 return omap_up_info;
1311 static int __devinit serial_omap_probe(struct platform_device *pdev)
1313 struct uart_omap_port *up;
1314 struct resource *mem, *irq;
1315 struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data;
1318 if (pdev->dev.of_node)
1319 omap_up_info = of_get_uart_port_info(&pdev->dev);
1321 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1323 dev_err(&pdev->dev, "no mem resource?\n");
1327 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1329 dev_err(&pdev->dev, "no irq resource?\n");
1333 if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem),
1334 pdev->dev.driver->name)) {
1335 dev_err(&pdev->dev, "memory region already claimed\n");
1339 if (gpio_is_valid(omap_up_info->DTR_gpio) &&
1340 omap_up_info->DTR_present) {
1341 ret = gpio_request(omap_up_info->DTR_gpio, "omap-serial");
1344 ret = gpio_direction_output(omap_up_info->DTR_gpio,
1345 omap_up_info->DTR_inverted);
1350 up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL);
1354 if (gpio_is_valid(omap_up_info->DTR_gpio) &&
1355 omap_up_info->DTR_present) {
1356 up->DTR_gpio = omap_up_info->DTR_gpio;
1357 up->DTR_inverted = omap_up_info->DTR_inverted;
1359 up->DTR_gpio = -EINVAL;
1362 up->dev = &pdev->dev;
1363 up->port.dev = &pdev->dev;
1364 up->port.type = PORT_OMAP;
1365 up->port.iotype = UPIO_MEM;
1366 up->port.irq = irq->start;
1368 up->port.regshift = 2;
1369 up->port.fifosize = 64;
1370 up->port.ops = &serial_omap_pops;
1372 if (pdev->dev.of_node)
1373 up->port.line = of_alias_get_id(pdev->dev.of_node, "serial");
1375 up->port.line = pdev->id;
1377 if (up->port.line < 0) {
1378 dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n",
1384 up->pins = devm_pinctrl_get_select_default(&pdev->dev);
1385 if (IS_ERR(up->pins)) {
1386 dev_warn(&pdev->dev, "did not get pins for uart%i error: %li\n",
1387 up->port.line, PTR_ERR(up->pins));
1391 sprintf(up->name, "OMAP UART%d", up->port.line);
1392 up->port.mapbase = mem->start;
1393 up->port.membase = devm_ioremap(&pdev->dev, mem->start,
1394 resource_size(mem));
1395 if (!up->port.membase) {
1396 dev_err(&pdev->dev, "can't ioremap UART\n");
1401 up->port.flags = omap_up_info->flags;
1402 up->port.uartclk = omap_up_info->uartclk;
1403 if (!up->port.uartclk) {
1404 up->port.uartclk = DEFAULT_CLK_SPEED;
1405 dev_warn(&pdev->dev, "No clock speed specified: using default:"
1406 "%d\n", DEFAULT_CLK_SPEED);
1409 up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1410 up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1411 pm_qos_add_request(&up->pm_qos_request,
1412 PM_QOS_CPU_DMA_LATENCY, up->latency);
1413 serial_omap_uart_wq = create_singlethread_workqueue(up->name);
1414 INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
1416 platform_set_drvdata(pdev, up);
1417 pm_runtime_enable(&pdev->dev);
1418 pm_runtime_use_autosuspend(&pdev->dev);
1419 pm_runtime_set_autosuspend_delay(&pdev->dev,
1420 omap_up_info->autosuspend_timeout);
1422 pm_runtime_irq_safe(&pdev->dev);
1423 pm_runtime_get_sync(&pdev->dev);
1425 omap_serial_fill_features_erratas(up);
1427 ui[up->port.line] = up;
1428 serial_omap_add_console_port(up);
1430 ret = uart_add_one_port(&serial_omap_reg, &up->port);
1434 pm_runtime_mark_last_busy(up->dev);
1435 pm_runtime_put_autosuspend(up->dev);
1439 pm_runtime_put(&pdev->dev);
1440 pm_runtime_disable(&pdev->dev);
1443 dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n",
1444 pdev->id, __func__, ret);
1448 static int __devexit serial_omap_remove(struct platform_device *dev)
1450 struct uart_omap_port *up = platform_get_drvdata(dev);
1452 pm_runtime_put_sync(up->dev);
1453 pm_runtime_disable(up->dev);
1454 uart_remove_one_port(&serial_omap_reg, &up->port);
1455 pm_qos_remove_request(&up->pm_qos_request);
1461 * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460)
1462 * The access to uart register after MDR1 Access
1463 * causes UART to corrupt data.
1466 * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS)
1467 * give 10 times as much
1469 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1)
1473 serial_out(up, UART_OMAP_MDR1, mdr1);
1475 serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT |
1476 UART_FCR_CLEAR_RCVR);
1478 * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and
1479 * TX_FIFO_E bit is 1.
1481 while (UART_LSR_THRE != (serial_in(up, UART_LSR) &
1482 (UART_LSR_THRE | UART_LSR_DR))) {
1485 /* Should *never* happen. we warn and carry on */
1486 dev_crit(up->dev, "Errata i202: timedout %x\n",
1487 serial_in(up, UART_LSR));
1494 #ifdef CONFIG_PM_RUNTIME
1495 static void serial_omap_restore_context(struct uart_omap_port *up)
1497 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1498 serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE);
1500 serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE);
1502 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1503 serial_out(up, UART_EFR, UART_EFR_ECB);
1504 serial_out(up, UART_LCR, 0x0); /* Operational mode */
1505 serial_out(up, UART_IER, 0x0);
1506 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1507 serial_out(up, UART_DLL, up->dll);
1508 serial_out(up, UART_DLM, up->dlh);
1509 serial_out(up, UART_LCR, 0x0); /* Operational mode */
1510 serial_out(up, UART_IER, up->ier);
1511 serial_out(up, UART_FCR, up->fcr);
1512 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
1513 serial_out(up, UART_MCR, up->mcr);
1514 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1515 serial_out(up, UART_OMAP_SCR, up->scr);
1516 serial_out(up, UART_EFR, up->efr);
1517 serial_out(up, UART_LCR, up->lcr);
1518 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1519 serial_omap_mdr1_errataset(up, up->mdr1);
1521 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1524 static int serial_omap_runtime_suspend(struct device *dev)
1526 struct uart_omap_port *up = dev_get_drvdata(dev);
1527 struct omap_uart_port_info *pdata = dev->platform_data;
1535 up->context_loss_cnt = serial_omap_get_context_loss_count(up);
1537 if (device_may_wakeup(dev)) {
1538 if (!up->wakeups_enabled) {
1539 serial_omap_enable_wakeup(up, true);
1540 up->wakeups_enabled = true;
1543 if (up->wakeups_enabled) {
1544 serial_omap_enable_wakeup(up, false);
1545 up->wakeups_enabled = false;
1549 up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1550 schedule_work(&up->qos_work);
1555 static int serial_omap_runtime_resume(struct device *dev)
1557 struct uart_omap_port *up = dev_get_drvdata(dev);
1559 u32 loss_cnt = serial_omap_get_context_loss_count(up);
1561 if (up->context_loss_cnt != loss_cnt)
1562 serial_omap_restore_context(up);
1564 up->latency = up->calc_latency;
1565 schedule_work(&up->qos_work);
1571 static const struct dev_pm_ops serial_omap_dev_pm_ops = {
1572 SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume)
1573 SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend,
1574 serial_omap_runtime_resume, NULL)
1577 #if defined(CONFIG_OF)
1578 static const struct of_device_id omap_serial_of_match[] = {
1579 { .compatible = "ti,omap2-uart" },
1580 { .compatible = "ti,omap3-uart" },
1581 { .compatible = "ti,omap4-uart" },
1584 MODULE_DEVICE_TABLE(of, omap_serial_of_match);
1587 static struct platform_driver serial_omap_driver = {
1588 .probe = serial_omap_probe,
1589 .remove = __devexit_p(serial_omap_remove),
1591 .name = DRIVER_NAME,
1592 .pm = &serial_omap_dev_pm_ops,
1593 .of_match_table = of_match_ptr(omap_serial_of_match),
1597 static int __init serial_omap_init(void)
1601 ret = uart_register_driver(&serial_omap_reg);
1604 ret = platform_driver_register(&serial_omap_driver);
1606 uart_unregister_driver(&serial_omap_reg);
1610 static void __exit serial_omap_exit(void)
1612 platform_driver_unregister(&serial_omap_driver);
1613 uart_unregister_driver(&serial_omap_reg);
1616 module_init(serial_omap_init);
1617 module_exit(serial_omap_exit);
1619 MODULE_DESCRIPTION("OMAP High Speed UART driver");
1620 MODULE_LICENSE("GPL");
1621 MODULE_AUTHOR("Texas Instruments Inc");