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;
107 struct pm_qos_request pm_qos_request;
110 struct work_struct qos_work;
111 struct pinctrl *pins;
114 #define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port)))
116 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
118 /* Forward declaration of functions */
119 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1);
121 static struct workqueue_struct *serial_omap_uart_wq;
123 static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
125 offset <<= up->port.regshift;
126 return readw(up->port.membase + offset);
129 static inline void serial_out(struct uart_omap_port *up, int offset, int value)
131 offset <<= up->port.regshift;
132 writew(value, up->port.membase + offset);
135 static inline void serial_omap_clear_fifos(struct uart_omap_port *up)
137 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
138 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
139 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
140 serial_out(up, UART_FCR, 0);
143 static int serial_omap_get_context_loss_count(struct uart_omap_port *up)
145 struct omap_uart_port_info *pdata = up->dev->platform_data;
147 if (!pdata || !pdata->get_context_loss_count)
150 return pdata->get_context_loss_count(up->dev);
153 static void serial_omap_set_forceidle(struct uart_omap_port *up)
155 struct omap_uart_port_info *pdata = up->dev->platform_data;
157 if (!pdata || !pdata->set_forceidle)
160 pdata->set_forceidle(up->dev);
163 static void serial_omap_set_noidle(struct uart_omap_port *up)
165 struct omap_uart_port_info *pdata = up->dev->platform_data;
167 if (!pdata || !pdata->set_noidle)
170 pdata->set_noidle(up->dev);
173 static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable)
175 struct omap_uart_port_info *pdata = up->dev->platform_data;
177 if (!pdata || !pdata->enable_wakeup)
180 pdata->enable_wakeup(up->dev, enable);
184 * serial_omap_get_divisor - calculate divisor value
185 * @port: uart port info
186 * @baud: baudrate for which divisor needs to be calculated.
188 * We have written our own function to get the divisor so as to support
189 * 13x mode. 3Mbps Baudrate as an different divisor.
190 * Reference OMAP TRM Chapter 17:
191 * Table 17-1. UART Mode Baud Rates, Divisor Values, and Error Rates
192 * referring to oversampling - divisor value
193 * baudrate 460,800 to 3,686,400 all have divisor 13
194 * except 3,000,000 which has divisor value 16
197 serial_omap_get_divisor(struct uart_port *port, unsigned int baud)
199 unsigned int divisor;
201 if (baud > OMAP_MODE13X_SPEED && baud != 3000000)
205 return port->uartclk/(baud * divisor);
208 static void serial_omap_enable_ms(struct uart_port *port)
210 struct uart_omap_port *up = to_uart_omap_port(port);
212 dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line);
214 pm_runtime_get_sync(up->dev);
215 up->ier |= UART_IER_MSI;
216 serial_out(up, UART_IER, up->ier);
217 pm_runtime_mark_last_busy(up->dev);
218 pm_runtime_put_autosuspend(up->dev);
221 static void serial_omap_stop_tx(struct uart_port *port)
223 struct uart_omap_port *up = to_uart_omap_port(port);
225 pm_runtime_get_sync(up->dev);
226 if (up->ier & UART_IER_THRI) {
227 up->ier &= ~UART_IER_THRI;
228 serial_out(up, UART_IER, up->ier);
231 serial_omap_set_forceidle(up);
233 pm_runtime_mark_last_busy(up->dev);
234 pm_runtime_put_autosuspend(up->dev);
237 static void serial_omap_stop_rx(struct uart_port *port)
239 struct uart_omap_port *up = to_uart_omap_port(port);
241 pm_runtime_get_sync(up->dev);
242 up->ier &= ~UART_IER_RLSI;
243 up->port.read_status_mask &= ~UART_LSR_DR;
244 serial_out(up, UART_IER, up->ier);
245 pm_runtime_mark_last_busy(up->dev);
246 pm_runtime_put_autosuspend(up->dev);
249 static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
251 struct circ_buf *xmit = &up->port.state->xmit;
254 if (!(lsr & UART_LSR_THRE))
257 if (up->port.x_char) {
258 serial_out(up, UART_TX, up->port.x_char);
259 up->port.icount.tx++;
263 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
264 serial_omap_stop_tx(&up->port);
267 count = up->port.fifosize / 4;
269 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
270 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
271 up->port.icount.tx++;
272 if (uart_circ_empty(xmit))
274 } while (--count > 0);
276 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
277 spin_unlock(&up->port.lock);
278 uart_write_wakeup(&up->port);
279 spin_lock(&up->port.lock);
282 if (uart_circ_empty(xmit))
283 serial_omap_stop_tx(&up->port);
286 static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
288 if (!(up->ier & UART_IER_THRI)) {
289 up->ier |= UART_IER_THRI;
290 serial_out(up, UART_IER, up->ier);
294 static void serial_omap_start_tx(struct uart_port *port)
296 struct uart_omap_port *up = to_uart_omap_port(port);
298 pm_runtime_get_sync(up->dev);
299 serial_omap_enable_ier_thri(up);
300 serial_omap_set_noidle(up);
301 pm_runtime_mark_last_busy(up->dev);
302 pm_runtime_put_autosuspend(up->dev);
305 static unsigned int check_modem_status(struct uart_omap_port *up)
309 status = serial_in(up, UART_MSR);
310 status |= up->msr_saved_flags;
311 up->msr_saved_flags = 0;
312 if ((status & UART_MSR_ANY_DELTA) == 0)
315 if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
316 up->port.state != NULL) {
317 if (status & UART_MSR_TERI)
318 up->port.icount.rng++;
319 if (status & UART_MSR_DDSR)
320 up->port.icount.dsr++;
321 if (status & UART_MSR_DDCD)
322 uart_handle_dcd_change
323 (&up->port, status & UART_MSR_DCD);
324 if (status & UART_MSR_DCTS)
325 uart_handle_cts_change
326 (&up->port, status & UART_MSR_CTS);
327 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
333 static void serial_omap_rlsi(struct uart_omap_port *up, unsigned int lsr)
336 unsigned char ch = 0;
338 if (likely(lsr & UART_LSR_DR))
339 ch = serial_in(up, UART_RX);
341 up->port.icount.rx++;
344 if (lsr & UART_LSR_BI) {
346 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
347 up->port.icount.brk++;
349 * We do the SysRQ and SAK checking
350 * here because otherwise the break
351 * may get masked by ignore_status_mask
352 * or read_status_mask.
354 if (uart_handle_break(&up->port))
359 if (lsr & UART_LSR_PE) {
361 up->port.icount.parity++;
364 if (lsr & UART_LSR_FE) {
366 up->port.icount.frame++;
369 if (lsr & UART_LSR_OE)
370 up->port.icount.overrun++;
372 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
373 if (up->port.line == up->port.cons->index) {
374 /* Recover the break flag from console xmit */
375 lsr |= up->lsr_break_flag;
378 uart_insert_char(&up->port, lsr, UART_LSR_OE, 0, flag);
381 static void serial_omap_rdi(struct uart_omap_port *up, unsigned int lsr)
383 unsigned char ch = 0;
386 if (!(lsr & UART_LSR_DR))
389 ch = serial_in(up, UART_RX);
391 up->port.icount.rx++;
393 if (uart_handle_sysrq_char(&up->port, ch))
396 uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
400 * serial_omap_irq() - This handles the interrupt from one port
401 * @irq: uart port irq number
402 * @dev_id: uart port info
404 static irqreturn_t serial_omap_irq(int irq, void *dev_id)
406 struct uart_omap_port *up = dev_id;
407 struct tty_struct *tty = up->port.state->port.tty;
408 unsigned int iir, lsr;
410 irqreturn_t ret = IRQ_NONE;
413 spin_lock(&up->port.lock);
414 pm_runtime_get_sync(up->dev);
417 iir = serial_in(up, UART_IIR);
418 if (iir & UART_IIR_NO_INT)
422 lsr = serial_in(up, UART_LSR);
424 /* extract IRQ type from IIR register */
429 check_modem_status(up);
432 transmit_chars(up, lsr);
434 case UART_IIR_RX_TIMEOUT:
437 serial_omap_rdi(up, lsr);
440 serial_omap_rlsi(up, lsr);
442 case UART_IIR_CTS_RTS_DSR:
443 /* simply try again */
450 } while (!(iir & UART_IIR_NO_INT) && max_count--);
452 spin_unlock(&up->port.lock);
454 tty_flip_buffer_push(tty);
456 pm_runtime_mark_last_busy(up->dev);
457 pm_runtime_put_autosuspend(up->dev);
458 up->port_activity = jiffies;
463 static unsigned int serial_omap_tx_empty(struct uart_port *port)
465 struct uart_omap_port *up = to_uart_omap_port(port);
466 unsigned long flags = 0;
467 unsigned int ret = 0;
469 pm_runtime_get_sync(up->dev);
470 dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->port.line);
471 spin_lock_irqsave(&up->port.lock, flags);
472 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
473 spin_unlock_irqrestore(&up->port.lock, flags);
474 pm_runtime_mark_last_busy(up->dev);
475 pm_runtime_put_autosuspend(up->dev);
479 static unsigned int serial_omap_get_mctrl(struct uart_port *port)
481 struct uart_omap_port *up = to_uart_omap_port(port);
483 unsigned int ret = 0;
485 pm_runtime_get_sync(up->dev);
486 status = check_modem_status(up);
487 pm_runtime_mark_last_busy(up->dev);
488 pm_runtime_put_autosuspend(up->dev);
490 dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->port.line);
492 if (status & UART_MSR_DCD)
494 if (status & UART_MSR_RI)
496 if (status & UART_MSR_DSR)
498 if (status & UART_MSR_CTS)
503 static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
505 struct uart_omap_port *up = to_uart_omap_port(port);
506 unsigned char mcr = 0, old_mcr;
508 dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->port.line);
509 if (mctrl & TIOCM_RTS)
511 if (mctrl & TIOCM_DTR)
513 if (mctrl & TIOCM_OUT1)
514 mcr |= UART_MCR_OUT1;
515 if (mctrl & TIOCM_OUT2)
516 mcr |= UART_MCR_OUT2;
517 if (mctrl & TIOCM_LOOP)
518 mcr |= UART_MCR_LOOP;
520 pm_runtime_get_sync(up->dev);
521 old_mcr = serial_in(up, UART_MCR);
522 old_mcr &= ~(UART_MCR_LOOP | UART_MCR_OUT2 | UART_MCR_OUT1 |
523 UART_MCR_DTR | UART_MCR_RTS);
524 up->mcr = old_mcr | mcr;
525 serial_out(up, UART_MCR, up->mcr);
526 pm_runtime_mark_last_busy(up->dev);
527 pm_runtime_put_autosuspend(up->dev);
529 if (gpio_is_valid(up->DTR_gpio) &&
530 !!(mctrl & TIOCM_DTR) != up->DTR_active) {
531 up->DTR_active = !up->DTR_active;
532 if (gpio_cansleep(up->DTR_gpio))
533 schedule_work(&up->qos_work);
535 gpio_set_value(up->DTR_gpio,
536 up->DTR_active != up->DTR_inverted);
540 static void serial_omap_break_ctl(struct uart_port *port, int break_state)
542 struct uart_omap_port *up = to_uart_omap_port(port);
543 unsigned long flags = 0;
545 dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line);
546 pm_runtime_get_sync(up->dev);
547 spin_lock_irqsave(&up->port.lock, flags);
548 if (break_state == -1)
549 up->lcr |= UART_LCR_SBC;
551 up->lcr &= ~UART_LCR_SBC;
552 serial_out(up, UART_LCR, up->lcr);
553 spin_unlock_irqrestore(&up->port.lock, flags);
554 pm_runtime_mark_last_busy(up->dev);
555 pm_runtime_put_autosuspend(up->dev);
558 static int serial_omap_startup(struct uart_port *port)
560 struct uart_omap_port *up = to_uart_omap_port(port);
561 unsigned long flags = 0;
567 retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags,
572 dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line);
574 pm_runtime_get_sync(up->dev);
576 * Clear the FIFO buffers and disable them.
577 * (they will be reenabled in set_termios())
579 serial_omap_clear_fifos(up);
580 /* For Hardware flow control */
581 serial_out(up, UART_MCR, UART_MCR_RTS);
584 * Clear the interrupt registers.
586 (void) serial_in(up, UART_LSR);
587 if (serial_in(up, UART_LSR) & UART_LSR_DR)
588 (void) serial_in(up, UART_RX);
589 (void) serial_in(up, UART_IIR);
590 (void) serial_in(up, UART_MSR);
593 * Now, initialize the UART
595 serial_out(up, UART_LCR, UART_LCR_WLEN8);
596 spin_lock_irqsave(&up->port.lock, flags);
598 * Most PC uarts need OUT2 raised to enable interrupts.
600 up->port.mctrl |= TIOCM_OUT2;
601 serial_omap_set_mctrl(&up->port, up->port.mctrl);
602 spin_unlock_irqrestore(&up->port.lock, flags);
604 up->msr_saved_flags = 0;
606 * Finally, enable interrupts. Note: Modem status interrupts
607 * are set via set_termios(), which will be occurring imminently
608 * anyway, so we don't enable them here.
610 up->ier = UART_IER_RLSI | UART_IER_RDI;
611 serial_out(up, UART_IER, up->ier);
613 /* Enable module level wake up */
614 serial_out(up, UART_OMAP_WER, OMAP_UART_WER_MOD_WKUP);
616 pm_runtime_mark_last_busy(up->dev);
617 pm_runtime_put_autosuspend(up->dev);
618 up->port_activity = jiffies;
622 static void serial_omap_shutdown(struct uart_port *port)
624 struct uart_omap_port *up = to_uart_omap_port(port);
625 unsigned long flags = 0;
627 dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->port.line);
629 pm_runtime_get_sync(up->dev);
631 * Disable interrupts from this port
634 serial_out(up, UART_IER, 0);
636 spin_lock_irqsave(&up->port.lock, flags);
637 up->port.mctrl &= ~TIOCM_OUT2;
638 serial_omap_set_mctrl(&up->port, up->port.mctrl);
639 spin_unlock_irqrestore(&up->port.lock, flags);
642 * Disable break condition and FIFOs
644 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
645 serial_omap_clear_fifos(up);
648 * Read data port to reset things, and then free the irq
650 if (serial_in(up, UART_LSR) & UART_LSR_DR)
651 (void) serial_in(up, UART_RX);
653 pm_runtime_mark_last_busy(up->dev);
654 pm_runtime_put_autosuspend(up->dev);
655 free_irq(up->port.irq, up);
659 serial_omap_configure_xonxoff
660 (struct uart_omap_port *up, struct ktermios *termios)
662 up->lcr = serial_in(up, UART_LCR);
663 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
664 up->efr = serial_in(up, UART_EFR);
665 serial_out(up, UART_EFR, up->efr & ~UART_EFR_ECB);
667 serial_out(up, UART_XON1, termios->c_cc[VSTART]);
668 serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]);
670 /* clear SW control mode bits */
671 up->efr &= OMAP_UART_SW_CLR;
675 * Enable XON/XOFF flow control on output.
676 * Transmit XON1, XOFF1
678 if (termios->c_iflag & IXON)
679 up->efr |= OMAP_UART_SW_TX;
683 * Enable XON/XOFF flow control on input.
684 * Receiver compares XON1, XOFF1.
686 if (termios->c_iflag & IXOFF)
687 up->efr |= OMAP_UART_SW_RX;
689 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
690 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
692 up->mcr = serial_in(up, UART_MCR);
696 * Enable any character to restart output.
697 * Operation resumes after receiving any
698 * character after recognition of the XOFF character
700 if (termios->c_iflag & IXANY)
701 up->mcr |= UART_MCR_XONANY;
703 up->mcr &= ~UART_MCR_XONANY;
705 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
706 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
707 serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
708 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
709 serial_out(up, UART_MCR, up->mcr & ~UART_MCR_TCRTLR);
710 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
711 serial_out(up, UART_EFR, up->efr);
712 serial_out(up, UART_LCR, up->lcr);
715 static void serial_omap_uart_qos_work(struct work_struct *work)
717 struct uart_omap_port *up = container_of(work, struct uart_omap_port,
720 pm_qos_update_request(&up->pm_qos_request, up->latency);
721 if (gpio_is_valid(up->DTR_gpio))
722 gpio_set_value_cansleep(up->DTR_gpio,
723 up->DTR_active != up->DTR_inverted);
727 serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
728 struct ktermios *old)
730 struct uart_omap_port *up = to_uart_omap_port(port);
731 unsigned char cval = 0;
732 unsigned long flags = 0;
733 unsigned int baud, quot;
735 switch (termios->c_cflag & CSIZE) {
737 cval = UART_LCR_WLEN5;
740 cval = UART_LCR_WLEN6;
743 cval = UART_LCR_WLEN7;
747 cval = UART_LCR_WLEN8;
751 if (termios->c_cflag & CSTOPB)
752 cval |= UART_LCR_STOP;
753 if (termios->c_cflag & PARENB)
754 cval |= UART_LCR_PARITY;
755 if (!(termios->c_cflag & PARODD))
756 cval |= UART_LCR_EPAR;
759 * Ask the core to calculate the divisor for us.
762 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13);
763 quot = serial_omap_get_divisor(port, baud);
765 /* calculate wakeup latency constraint */
766 up->calc_latency = (USEC_PER_SEC * up->port.fifosize) / (baud / 8);
767 up->latency = up->calc_latency;
768 schedule_work(&up->qos_work);
770 up->dll = quot & 0xff;
772 up->mdr1 = UART_OMAP_MDR1_DISABLE;
774 up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 |
775 UART_FCR_ENABLE_FIFO;
778 * Ok, we're now changing the port state. Do it with
779 * interrupts disabled.
781 pm_runtime_get_sync(up->dev);
782 spin_lock_irqsave(&up->port.lock, flags);
785 * Update the per-port timeout.
787 uart_update_timeout(port, termios->c_cflag, baud);
789 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
790 if (termios->c_iflag & INPCK)
791 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
792 if (termios->c_iflag & (BRKINT | PARMRK))
793 up->port.read_status_mask |= UART_LSR_BI;
796 * Characters to ignore
798 up->port.ignore_status_mask = 0;
799 if (termios->c_iflag & IGNPAR)
800 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
801 if (termios->c_iflag & IGNBRK) {
802 up->port.ignore_status_mask |= UART_LSR_BI;
804 * If we're ignoring parity and break indicators,
805 * ignore overruns too (for real raw support).
807 if (termios->c_iflag & IGNPAR)
808 up->port.ignore_status_mask |= UART_LSR_OE;
812 * ignore all characters if CREAD is not set
814 if ((termios->c_cflag & CREAD) == 0)
815 up->port.ignore_status_mask |= UART_LSR_DR;
818 * Modem status interrupts
820 up->ier &= ~UART_IER_MSI;
821 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
822 up->ier |= UART_IER_MSI;
823 serial_out(up, UART_IER, up->ier);
824 serial_out(up, UART_LCR, cval); /* reset DLAB */
826 up->scr = OMAP_UART_SCR_TX_EMPTY;
828 /* FIFOs and DMA Settings */
830 /* FCR can be changed only when the
831 * baud clock is not running
832 * DLL_REG and DLH_REG set to 0.
834 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
835 serial_out(up, UART_DLL, 0);
836 serial_out(up, UART_DLM, 0);
837 serial_out(up, UART_LCR, 0);
839 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
841 up->efr = serial_in(up, UART_EFR) & ~UART_EFR_ECB;
842 up->efr &= ~UART_EFR_SCD;
843 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
845 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
846 up->mcr = serial_in(up, UART_MCR) & ~UART_MCR_TCRTLR;
847 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
848 /* FIFO ENABLE, DMA MODE */
850 up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK;
852 /* Set receive FIFO threshold to 16 characters and
853 * transmit FIFO threshold to 16 spaces
855 up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK;
856 up->fcr &= ~OMAP_UART_FCR_TX_FIFO_TRIG_MASK;
857 up->fcr |= UART_FCR6_R_TRIGGER_16 | UART_FCR6_T_TRIGGER_24 |
858 UART_FCR_ENABLE_FIFO;
860 serial_out(up, UART_FCR, up->fcr);
861 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
863 serial_out(up, UART_OMAP_SCR, up->scr);
865 /* Reset UART_MCR_TCRTLR: this must be done with the EFR_ECB bit set */
866 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
867 serial_out(up, UART_MCR, up->mcr);
868 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
869 serial_out(up, UART_EFR, up->efr);
870 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
872 /* Protocol, Baud Rate, and Interrupt Settings */
874 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
875 serial_omap_mdr1_errataset(up, up->mdr1);
877 serial_out(up, UART_OMAP_MDR1, up->mdr1);
879 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
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 && up->port.flags & UPF_HARD_FLOW) {
909 /* Enable access to TCR/TLR */
910 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
911 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
912 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
913 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
915 serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
917 /* Enable AUTORTS and AUTOCTS */
918 up->efr |= UART_EFR_CTS | UART_EFR_RTS;
920 /* Disable access to TCR/TLR */
921 serial_out(up, UART_MCR, up->mcr | UART_MCR_RTS);
922 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
923 serial_out(up, UART_EFR, up->efr);
924 serial_out(up, UART_LCR, cval);
926 /* Disable AUTORTS and AUTOCTS */
927 up->efr &= ~(UART_EFR_CTS | UART_EFR_RTS);
929 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
930 serial_out(up, UART_EFR, up->efr);
931 serial_out(up, UART_LCR, cval);
934 serial_omap_set_mctrl(&up->port, up->port.mctrl);
935 /* Software Flow Control Configuration */
936 if (up->port.flags & UPF_SOFT_FLOW)
937 serial_omap_configure_xonxoff(up, termios);
939 spin_unlock_irqrestore(&up->port.lock, flags);
940 pm_runtime_mark_last_busy(up->dev);
941 pm_runtime_put_autosuspend(up->dev);
942 dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line);
945 static int serial_omap_set_wake(struct uart_port *port, unsigned int state)
947 struct uart_omap_port *up = to_uart_omap_port(port);
949 serial_omap_enable_wakeup(up, state);
955 serial_omap_pm(struct uart_port *port, unsigned int state,
956 unsigned int oldstate)
958 struct uart_omap_port *up = to_uart_omap_port(port);
961 dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line);
963 pm_runtime_get_sync(up->dev);
964 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
965 efr = serial_in(up, UART_EFR);
966 serial_out(up, UART_EFR, efr | UART_EFR_ECB);
967 serial_out(up, UART_LCR, 0);
969 serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0);
970 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
971 serial_out(up, UART_EFR, efr);
972 serial_out(up, UART_LCR, 0);
974 if (!device_may_wakeup(up->dev)) {
976 pm_runtime_forbid(up->dev);
978 pm_runtime_allow(up->dev);
981 pm_runtime_mark_last_busy(up->dev);
982 pm_runtime_put_autosuspend(up->dev);
985 static void serial_omap_release_port(struct uart_port *port)
987 dev_dbg(port->dev, "serial_omap_release_port+\n");
990 static int serial_omap_request_port(struct uart_port *port)
992 dev_dbg(port->dev, "serial_omap_request_port+\n");
996 static void serial_omap_config_port(struct uart_port *port, int flags)
998 struct uart_omap_port *up = to_uart_omap_port(port);
1000 dev_dbg(up->port.dev, "serial_omap_config_port+%d\n",
1002 up->port.type = PORT_OMAP;
1006 serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser)
1008 /* we don't want the core code to modify any port params */
1009 dev_dbg(port->dev, "serial_omap_verify_port+\n");
1014 serial_omap_type(struct uart_port *port)
1016 struct uart_omap_port *up = to_uart_omap_port(port);
1018 dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->port.line);
1022 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
1024 static inline void wait_for_xmitr(struct uart_omap_port *up)
1026 unsigned int status, tmout = 10000;
1028 /* Wait up to 10ms for the character(s) to be sent. */
1030 status = serial_in(up, UART_LSR);
1032 if (status & UART_LSR_BI)
1033 up->lsr_break_flag = UART_LSR_BI;
1038 } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
1040 /* Wait up to 1s for flow control if necessary */
1041 if (up->port.flags & UPF_CONS_FLOW) {
1043 for (tmout = 1000000; tmout; tmout--) {
1044 unsigned int msr = serial_in(up, UART_MSR);
1046 up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
1047 if (msr & UART_MSR_CTS)
1055 #ifdef CONFIG_CONSOLE_POLL
1057 static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch)
1059 struct uart_omap_port *up = to_uart_omap_port(port);
1061 pm_runtime_get_sync(up->dev);
1063 serial_out(up, UART_TX, ch);
1064 pm_runtime_mark_last_busy(up->dev);
1065 pm_runtime_put_autosuspend(up->dev);
1068 static int serial_omap_poll_get_char(struct uart_port *port)
1070 struct uart_omap_port *up = to_uart_omap_port(port);
1071 unsigned int status;
1073 pm_runtime_get_sync(up->dev);
1074 status = serial_in(up, UART_LSR);
1075 if (!(status & UART_LSR_DR)) {
1076 status = NO_POLL_CHAR;
1080 status = serial_in(up, UART_RX);
1083 pm_runtime_mark_last_busy(up->dev);
1084 pm_runtime_put_autosuspend(up->dev);
1089 #endif /* CONFIG_CONSOLE_POLL */
1091 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
1093 static struct uart_omap_port *serial_omap_console_ports[4];
1095 static struct uart_driver serial_omap_reg;
1097 static void serial_omap_console_putchar(struct uart_port *port, int ch)
1099 struct uart_omap_port *up = to_uart_omap_port(port);
1102 serial_out(up, UART_TX, ch);
1106 serial_omap_console_write(struct console *co, const char *s,
1109 struct uart_omap_port *up = serial_omap_console_ports[co->index];
1110 unsigned long flags;
1114 pm_runtime_get_sync(up->dev);
1116 local_irq_save(flags);
1119 else if (oops_in_progress)
1120 locked = spin_trylock(&up->port.lock);
1122 spin_lock(&up->port.lock);
1125 * First save the IER then disable the interrupts
1127 ier = serial_in(up, UART_IER);
1128 serial_out(up, UART_IER, 0);
1130 uart_console_write(&up->port, s, count, serial_omap_console_putchar);
1133 * Finally, wait for transmitter to become empty
1134 * and restore the IER
1137 serial_out(up, UART_IER, ier);
1139 * The receive handling will happen properly because the
1140 * receive ready bit will still be set; it is not cleared
1141 * on read. However, modem control will not, we must
1142 * call it if we have saved something in the saved flags
1143 * while processing with interrupts off.
1145 if (up->msr_saved_flags)
1146 check_modem_status(up);
1148 pm_runtime_mark_last_busy(up->dev);
1149 pm_runtime_put_autosuspend(up->dev);
1151 spin_unlock(&up->port.lock);
1152 local_irq_restore(flags);
1156 serial_omap_console_setup(struct console *co, char *options)
1158 struct uart_omap_port *up;
1164 if (serial_omap_console_ports[co->index] == NULL)
1166 up = serial_omap_console_ports[co->index];
1169 uart_parse_options(options, &baud, &parity, &bits, &flow);
1171 return uart_set_options(&up->port, co, baud, parity, bits, flow);
1174 static struct console serial_omap_console = {
1175 .name = OMAP_SERIAL_NAME,
1176 .write = serial_omap_console_write,
1177 .device = uart_console_device,
1178 .setup = serial_omap_console_setup,
1179 .flags = CON_PRINTBUFFER,
1181 .data = &serial_omap_reg,
1184 static void serial_omap_add_console_port(struct uart_omap_port *up)
1186 serial_omap_console_ports[up->port.line] = up;
1189 #define OMAP_CONSOLE (&serial_omap_console)
1193 #define OMAP_CONSOLE NULL
1195 static inline void serial_omap_add_console_port(struct uart_omap_port *up)
1200 static struct uart_ops serial_omap_pops = {
1201 .tx_empty = serial_omap_tx_empty,
1202 .set_mctrl = serial_omap_set_mctrl,
1203 .get_mctrl = serial_omap_get_mctrl,
1204 .stop_tx = serial_omap_stop_tx,
1205 .start_tx = serial_omap_start_tx,
1206 .stop_rx = serial_omap_stop_rx,
1207 .enable_ms = serial_omap_enable_ms,
1208 .break_ctl = serial_omap_break_ctl,
1209 .startup = serial_omap_startup,
1210 .shutdown = serial_omap_shutdown,
1211 .set_termios = serial_omap_set_termios,
1212 .pm = serial_omap_pm,
1213 .set_wake = serial_omap_set_wake,
1214 .type = serial_omap_type,
1215 .release_port = serial_omap_release_port,
1216 .request_port = serial_omap_request_port,
1217 .config_port = serial_omap_config_port,
1218 .verify_port = serial_omap_verify_port,
1219 #ifdef CONFIG_CONSOLE_POLL
1220 .poll_put_char = serial_omap_poll_put_char,
1221 .poll_get_char = serial_omap_poll_get_char,
1225 static struct uart_driver serial_omap_reg = {
1226 .owner = THIS_MODULE,
1227 .driver_name = "OMAP-SERIAL",
1228 .dev_name = OMAP_SERIAL_NAME,
1229 .nr = OMAP_MAX_HSUART_PORTS,
1230 .cons = OMAP_CONSOLE,
1233 #ifdef CONFIG_PM_SLEEP
1234 static int serial_omap_suspend(struct device *dev)
1236 struct uart_omap_port *up = dev_get_drvdata(dev);
1238 uart_suspend_port(&serial_omap_reg, &up->port);
1239 flush_work(&up->qos_work);
1244 static int serial_omap_resume(struct device *dev)
1246 struct uart_omap_port *up = dev_get_drvdata(dev);
1248 uart_resume_port(&serial_omap_reg, &up->port);
1254 static void __devinit omap_serial_fill_features_erratas(struct uart_omap_port *up)
1257 u16 revision, major, minor;
1259 mvr = serial_in(up, UART_OMAP_MVER);
1261 /* Check revision register scheme */
1262 scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT;
1265 case 0: /* Legacy Scheme: OMAP2/3 */
1266 /* MINOR_REV[0:4], MAJOR_REV[4:7] */
1267 major = (mvr & OMAP_UART_LEGACY_MVR_MAJ_MASK) >>
1268 OMAP_UART_LEGACY_MVR_MAJ_SHIFT;
1269 minor = (mvr & OMAP_UART_LEGACY_MVR_MIN_MASK);
1272 /* New Scheme: OMAP4+ */
1273 /* MINOR_REV[0:5], MAJOR_REV[8:10] */
1274 major = (mvr & OMAP_UART_MVR_MAJ_MASK) >>
1275 OMAP_UART_MVR_MAJ_SHIFT;
1276 minor = (mvr & OMAP_UART_MVR_MIN_MASK);
1280 "Unknown %s revision, defaulting to highest\n",
1282 /* highest possible revision */
1287 /* normalize revision for the driver */
1288 revision = UART_BUILD_REVISION(major, minor);
1291 case OMAP_UART_REV_46:
1292 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1293 UART_ERRATA_i291_DMA_FORCEIDLE);
1295 case OMAP_UART_REV_52:
1296 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1297 UART_ERRATA_i291_DMA_FORCEIDLE);
1299 case OMAP_UART_REV_63:
1300 up->errata |= UART_ERRATA_i202_MDR1_ACCESS;
1307 static __devinit struct omap_uart_port_info *of_get_uart_port_info(struct device *dev)
1309 struct omap_uart_port_info *omap_up_info;
1311 omap_up_info = devm_kzalloc(dev, sizeof(*omap_up_info), GFP_KERNEL);
1313 return NULL; /* out of memory */
1315 of_property_read_u32(dev->of_node, "clock-frequency",
1316 &omap_up_info->uartclk);
1317 return omap_up_info;
1320 static int __devinit serial_omap_probe(struct platform_device *pdev)
1322 struct uart_omap_port *up;
1323 struct resource *mem, *irq;
1324 struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data;
1327 if (pdev->dev.of_node)
1328 omap_up_info = of_get_uart_port_info(&pdev->dev);
1330 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1332 dev_err(&pdev->dev, "no mem resource?\n");
1336 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1338 dev_err(&pdev->dev, "no irq resource?\n");
1342 if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem),
1343 pdev->dev.driver->name)) {
1344 dev_err(&pdev->dev, "memory region already claimed\n");
1348 if (gpio_is_valid(omap_up_info->DTR_gpio) &&
1349 omap_up_info->DTR_present) {
1350 ret = gpio_request(omap_up_info->DTR_gpio, "omap-serial");
1353 ret = gpio_direction_output(omap_up_info->DTR_gpio,
1354 omap_up_info->DTR_inverted);
1359 up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL);
1363 if (gpio_is_valid(omap_up_info->DTR_gpio) &&
1364 omap_up_info->DTR_present) {
1365 up->DTR_gpio = omap_up_info->DTR_gpio;
1366 up->DTR_inverted = omap_up_info->DTR_inverted;
1368 up->DTR_gpio = -EINVAL;
1371 up->dev = &pdev->dev;
1372 up->port.dev = &pdev->dev;
1373 up->port.type = PORT_OMAP;
1374 up->port.iotype = UPIO_MEM;
1375 up->port.irq = irq->start;
1377 up->port.regshift = 2;
1378 up->port.fifosize = 64;
1379 up->port.ops = &serial_omap_pops;
1381 if (pdev->dev.of_node)
1382 up->port.line = of_alias_get_id(pdev->dev.of_node, "serial");
1384 up->port.line = pdev->id;
1386 if (up->port.line < 0) {
1387 dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n",
1393 up->pins = devm_pinctrl_get_select_default(&pdev->dev);
1394 if (IS_ERR(up->pins)) {
1395 dev_warn(&pdev->dev, "did not get pins for uart%i error: %li\n",
1396 up->port.line, PTR_ERR(up->pins));
1400 sprintf(up->name, "OMAP UART%d", up->port.line);
1401 up->port.mapbase = mem->start;
1402 up->port.membase = devm_ioremap(&pdev->dev, mem->start,
1403 resource_size(mem));
1404 if (!up->port.membase) {
1405 dev_err(&pdev->dev, "can't ioremap UART\n");
1410 up->port.flags = omap_up_info->flags;
1411 up->port.uartclk = omap_up_info->uartclk;
1412 if (!up->port.uartclk) {
1413 up->port.uartclk = DEFAULT_CLK_SPEED;
1414 dev_warn(&pdev->dev, "No clock speed specified: using default:"
1415 "%d\n", DEFAULT_CLK_SPEED);
1418 up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1419 up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1420 pm_qos_add_request(&up->pm_qos_request,
1421 PM_QOS_CPU_DMA_LATENCY, up->latency);
1422 serial_omap_uart_wq = create_singlethread_workqueue(up->name);
1423 INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
1425 platform_set_drvdata(pdev, up);
1426 pm_runtime_enable(&pdev->dev);
1427 pm_runtime_use_autosuspend(&pdev->dev);
1428 pm_runtime_set_autosuspend_delay(&pdev->dev,
1429 omap_up_info->autosuspend_timeout);
1431 pm_runtime_irq_safe(&pdev->dev);
1432 pm_runtime_get_sync(&pdev->dev);
1434 omap_serial_fill_features_erratas(up);
1436 ui[up->port.line] = up;
1437 serial_omap_add_console_port(up);
1439 ret = uart_add_one_port(&serial_omap_reg, &up->port);
1443 pm_runtime_mark_last_busy(up->dev);
1444 pm_runtime_put_autosuspend(up->dev);
1448 pm_runtime_put(&pdev->dev);
1449 pm_runtime_disable(&pdev->dev);
1452 dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n",
1453 pdev->id, __func__, ret);
1457 static int __devexit serial_omap_remove(struct platform_device *dev)
1459 struct uart_omap_port *up = platform_get_drvdata(dev);
1461 pm_runtime_put_sync(up->dev);
1462 pm_runtime_disable(up->dev);
1463 uart_remove_one_port(&serial_omap_reg, &up->port);
1464 pm_qos_remove_request(&up->pm_qos_request);
1470 * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460)
1471 * The access to uart register after MDR1 Access
1472 * causes UART to corrupt data.
1475 * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS)
1476 * give 10 times as much
1478 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1)
1482 serial_out(up, UART_OMAP_MDR1, mdr1);
1484 serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT |
1485 UART_FCR_CLEAR_RCVR);
1487 * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and
1488 * TX_FIFO_E bit is 1.
1490 while (UART_LSR_THRE != (serial_in(up, UART_LSR) &
1491 (UART_LSR_THRE | UART_LSR_DR))) {
1494 /* Should *never* happen. we warn and carry on */
1495 dev_crit(up->dev, "Errata i202: timedout %x\n",
1496 serial_in(up, UART_LSR));
1503 #ifdef CONFIG_PM_RUNTIME
1504 static void serial_omap_restore_context(struct uart_omap_port *up)
1506 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1507 serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE);
1509 serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE);
1511 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1512 serial_out(up, UART_EFR, UART_EFR_ECB);
1513 serial_out(up, UART_LCR, 0x0); /* Operational mode */
1514 serial_out(up, UART_IER, 0x0);
1515 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1516 serial_out(up, UART_DLL, up->dll);
1517 serial_out(up, UART_DLM, up->dlh);
1518 serial_out(up, UART_LCR, 0x0); /* Operational mode */
1519 serial_out(up, UART_IER, up->ier);
1520 serial_out(up, UART_FCR, up->fcr);
1521 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
1522 serial_out(up, UART_MCR, up->mcr);
1523 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1524 serial_out(up, UART_OMAP_SCR, up->scr);
1525 serial_out(up, UART_EFR, up->efr);
1526 serial_out(up, UART_LCR, up->lcr);
1527 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1528 serial_omap_mdr1_errataset(up, up->mdr1);
1530 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1533 static int serial_omap_runtime_suspend(struct device *dev)
1535 struct uart_omap_port *up = dev_get_drvdata(dev);
1536 struct omap_uart_port_info *pdata = dev->platform_data;
1544 up->context_loss_cnt = serial_omap_get_context_loss_count(up);
1546 if (device_may_wakeup(dev)) {
1547 if (!up->wakeups_enabled) {
1548 serial_omap_enable_wakeup(up, true);
1549 up->wakeups_enabled = true;
1552 if (up->wakeups_enabled) {
1553 serial_omap_enable_wakeup(up, false);
1554 up->wakeups_enabled = false;
1558 up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1559 schedule_work(&up->qos_work);
1564 static int serial_omap_runtime_resume(struct device *dev)
1566 struct uart_omap_port *up = dev_get_drvdata(dev);
1568 u32 loss_cnt = serial_omap_get_context_loss_count(up);
1570 if (up->context_loss_cnt != loss_cnt)
1571 serial_omap_restore_context(up);
1573 up->latency = up->calc_latency;
1574 schedule_work(&up->qos_work);
1580 static const struct dev_pm_ops serial_omap_dev_pm_ops = {
1581 SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume)
1582 SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend,
1583 serial_omap_runtime_resume, NULL)
1586 #if defined(CONFIG_OF)
1587 static const struct of_device_id omap_serial_of_match[] = {
1588 { .compatible = "ti,omap2-uart" },
1589 { .compatible = "ti,omap3-uart" },
1590 { .compatible = "ti,omap4-uart" },
1593 MODULE_DEVICE_TABLE(of, omap_serial_of_match);
1596 static struct platform_driver serial_omap_driver = {
1597 .probe = serial_omap_probe,
1598 .remove = __devexit_p(serial_omap_remove),
1600 .name = DRIVER_NAME,
1601 .pm = &serial_omap_dev_pm_ops,
1602 .of_match_table = of_match_ptr(omap_serial_of_match),
1606 static int __init serial_omap_init(void)
1610 ret = uart_register_driver(&serial_omap_reg);
1613 ret = platform_driver_register(&serial_omap_driver);
1615 uart_unregister_driver(&serial_omap_reg);
1619 static void __exit serial_omap_exit(void)
1621 platform_driver_unregister(&serial_omap_driver);
1622 uart_unregister_driver(&serial_omap_reg);
1625 module_init(serial_omap_init);
1626 module_exit(serial_omap_exit);
1628 MODULE_DESCRIPTION("OMAP High Speed UART driver");
1629 MODULE_LICENSE("GPL");
1630 MODULE_AUTHOR("Texas Instruments Inc");