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>
44 #include <plat/omap-serial.h>
46 #define UART_BUILD_REVISION(x, y) (((x) << 8) | (y))
48 #define OMAP_UART_REV_42 0x0402
49 #define OMAP_UART_REV_46 0x0406
50 #define OMAP_UART_REV_52 0x0502
51 #define OMAP_UART_REV_63 0x0603
53 #define DEFAULT_CLK_SPEED 48000000 /* 48Mhz*/
55 /* SCR register bitmasks */
56 #define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK (1 << 7)
58 /* FCR register bitmasks */
59 #define OMAP_UART_FCR_RX_FIFO_TRIG_MASK (0x3 << 6)
60 #define OMAP_UART_FCR_TX_FIFO_TRIG_MASK (0x3 << 4)
62 /* MVR register bitmasks */
63 #define OMAP_UART_MVR_SCHEME_SHIFT 30
65 #define OMAP_UART_LEGACY_MVR_MAJ_MASK 0xf0
66 #define OMAP_UART_LEGACY_MVR_MAJ_SHIFT 4
67 #define OMAP_UART_LEGACY_MVR_MIN_MASK 0x0f
69 #define OMAP_UART_MVR_MAJ_MASK 0x700
70 #define OMAP_UART_MVR_MAJ_SHIFT 8
71 #define OMAP_UART_MVR_MIN_MASK 0x3f
73 struct uart_omap_port {
74 struct uart_port port;
75 struct uart_omap_dma uart_dma;
90 * Some bits in registers are cleared on a read, so they must
91 * be saved whenever the register is read but the bits will not
92 * be immediately processed.
94 unsigned int lsr_break_flag;
95 unsigned char msr_saved_flags;
97 unsigned long port_activity;
101 unsigned int irq_pending:1;
103 struct pm_qos_request pm_qos_request;
106 struct work_struct qos_work;
109 #define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port)))
111 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
113 /* Forward declaration of functions */
114 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1);
116 static struct workqueue_struct *serial_omap_uart_wq;
118 static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
120 offset <<= up->port.regshift;
121 return readw(up->port.membase + offset);
124 static inline void serial_out(struct uart_omap_port *up, int offset, int value)
126 offset <<= up->port.regshift;
127 writew(value, up->port.membase + offset);
130 static inline void serial_omap_clear_fifos(struct uart_omap_port *up)
132 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
133 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
134 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
135 serial_out(up, UART_FCR, 0);
138 static int serial_omap_get_context_loss_count(struct uart_omap_port *up)
140 struct omap_uart_port_info *pdata = up->dev->platform_data;
142 if (!pdata->get_context_loss_count)
145 return pdata->get_context_loss_count(up->dev);
148 static void serial_omap_set_forceidle(struct uart_omap_port *up)
150 struct omap_uart_port_info *pdata = up->dev->platform_data;
152 if (pdata->set_forceidle)
153 pdata->set_forceidle(up->dev);
156 static void serial_omap_set_noidle(struct uart_omap_port *up)
158 struct omap_uart_port_info *pdata = up->dev->platform_data;
160 if (pdata->set_noidle)
161 pdata->set_noidle(up->dev);
164 static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable)
166 struct omap_uart_port_info *pdata = up->dev->platform_data;
168 if (pdata->enable_wakeup)
169 pdata->enable_wakeup(up->dev, enable);
173 * serial_omap_get_divisor - calculate divisor value
174 * @port: uart port info
175 * @baud: baudrate for which divisor needs to be calculated.
177 * We have written our own function to get the divisor so as to support
178 * 13x mode. 3Mbps Baudrate as an different divisor.
179 * Reference OMAP TRM Chapter 17:
180 * Table 17-1. UART Mode Baud Rates, Divisor Values, and Error Rates
181 * referring to oversampling - divisor value
182 * baudrate 460,800 to 3,686,400 all have divisor 13
183 * except 3,000,000 which has divisor value 16
186 serial_omap_get_divisor(struct uart_port *port, unsigned int baud)
188 unsigned int divisor;
190 if (baud > OMAP_MODE13X_SPEED && baud != 3000000)
194 return port->uartclk/(baud * divisor);
197 static void serial_omap_enable_ms(struct uart_port *port)
199 struct uart_omap_port *up = to_uart_omap_port(port);
201 dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->port.line);
203 pm_runtime_get_sync(up->dev);
204 up->ier |= UART_IER_MSI;
205 serial_out(up, UART_IER, up->ier);
206 pm_runtime_mark_last_busy(up->dev);
207 pm_runtime_put_autosuspend(up->dev);
210 static void serial_omap_stop_tx(struct uart_port *port)
212 struct uart_omap_port *up = to_uart_omap_port(port);
214 pm_runtime_get_sync(up->dev);
215 if (up->ier & UART_IER_THRI) {
216 up->ier &= ~UART_IER_THRI;
217 serial_out(up, UART_IER, up->ier);
220 serial_omap_set_forceidle(up);
222 pm_runtime_mark_last_busy(up->dev);
223 pm_runtime_put_autosuspend(up->dev);
226 static void serial_omap_stop_rx(struct uart_port *port)
228 struct uart_omap_port *up = to_uart_omap_port(port);
230 pm_runtime_get_sync(up->dev);
231 up->ier &= ~UART_IER_RLSI;
232 up->port.read_status_mask &= ~UART_LSR_DR;
233 serial_out(up, UART_IER, up->ier);
234 pm_runtime_mark_last_busy(up->dev);
235 pm_runtime_put_autosuspend(up->dev);
238 static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
240 struct circ_buf *xmit = &up->port.state->xmit;
243 if (!(lsr & UART_LSR_THRE))
246 if (up->port.x_char) {
247 serial_out(up, UART_TX, up->port.x_char);
248 up->port.icount.tx++;
252 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
253 serial_omap_stop_tx(&up->port);
256 count = up->port.fifosize / 4;
258 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
259 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
260 up->port.icount.tx++;
261 if (uart_circ_empty(xmit))
263 } while (--count > 0);
265 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
266 spin_unlock(&up->port.lock);
267 uart_write_wakeup(&up->port);
268 spin_lock(&up->port.lock);
271 if (uart_circ_empty(xmit))
272 serial_omap_stop_tx(&up->port);
275 static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
277 if (!(up->ier & UART_IER_THRI)) {
278 up->ier |= UART_IER_THRI;
279 serial_out(up, UART_IER, up->ier);
283 static void serial_omap_start_tx(struct uart_port *port)
285 struct uart_omap_port *up = to_uart_omap_port(port);
287 pm_runtime_get_sync(up->dev);
288 serial_omap_enable_ier_thri(up);
289 serial_omap_set_noidle(up);
290 pm_runtime_mark_last_busy(up->dev);
291 pm_runtime_put_autosuspend(up->dev);
294 static unsigned int check_modem_status(struct uart_omap_port *up)
298 status = serial_in(up, UART_MSR);
299 status |= up->msr_saved_flags;
300 up->msr_saved_flags = 0;
301 if ((status & UART_MSR_ANY_DELTA) == 0)
304 if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
305 up->port.state != NULL) {
306 if (status & UART_MSR_TERI)
307 up->port.icount.rng++;
308 if (status & UART_MSR_DDSR)
309 up->port.icount.dsr++;
310 if (status & UART_MSR_DDCD)
311 uart_handle_dcd_change
312 (&up->port, status & UART_MSR_DCD);
313 if (status & UART_MSR_DCTS)
314 uart_handle_cts_change
315 (&up->port, status & UART_MSR_CTS);
316 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
322 static void serial_omap_rlsi(struct uart_omap_port *up, unsigned int lsr)
326 up->port.icount.rx++;
329 if (lsr & UART_LSR_BI) {
331 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
332 up->port.icount.brk++;
334 * We do the SysRQ and SAK checking
335 * here because otherwise the break
336 * may get masked by ignore_status_mask
337 * or read_status_mask.
339 if (uart_handle_break(&up->port))
344 if (lsr & UART_LSR_PE) {
346 up->port.icount.parity++;
349 if (lsr & UART_LSR_FE) {
351 up->port.icount.frame++;
354 if (lsr & UART_LSR_OE)
355 up->port.icount.overrun++;
357 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
358 if (up->port.line == up->port.cons->index) {
359 /* Recover the break flag from console xmit */
360 lsr |= up->lsr_break_flag;
363 uart_insert_char(&up->port, lsr, UART_LSR_OE, 0, flag);
366 static void serial_omap_rdi(struct uart_omap_port *up, unsigned int lsr)
368 unsigned char ch = 0;
371 if (!(lsr & UART_LSR_DR))
374 ch = serial_in(up, UART_RX);
376 up->port.icount.rx++;
378 if (uart_handle_sysrq_char(&up->port, ch))
381 uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
385 * serial_omap_irq() - This handles the interrupt from one port
386 * @irq: uart port irq number
387 * @dev_id: uart port info
389 static irqreturn_t serial_omap_irq(int irq, void *dev_id)
391 struct uart_omap_port *up = dev_id;
392 struct tty_struct *tty = up->port.state->port.tty;
393 unsigned int iir, lsr;
395 irqreturn_t ret = IRQ_NONE;
398 spin_lock(&up->port.lock);
399 pm_runtime_get_sync(up->dev);
402 iir = serial_in(up, UART_IIR);
403 if (iir & UART_IIR_NO_INT)
407 lsr = serial_in(up, UART_LSR);
409 /* extract IRQ type from IIR register */
414 check_modem_status(up);
417 transmit_chars(up, lsr);
419 case UART_IIR_RX_TIMEOUT:
422 serial_omap_rdi(up, lsr);
425 serial_omap_rlsi(up, lsr);
427 case UART_IIR_CTS_RTS_DSR:
428 /* simply try again */
435 } while (!(iir & UART_IIR_NO_INT) && max_count--);
437 spin_unlock(&up->port.lock);
439 tty_flip_buffer_push(tty);
441 pm_runtime_mark_last_busy(up->dev);
442 pm_runtime_put_autosuspend(up->dev);
443 up->port_activity = jiffies;
448 static unsigned int serial_omap_tx_empty(struct uart_port *port)
450 struct uart_omap_port *up = to_uart_omap_port(port);
451 unsigned long flags = 0;
452 unsigned int ret = 0;
454 pm_runtime_get_sync(up->dev);
455 dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->port.line);
456 spin_lock_irqsave(&up->port.lock, flags);
457 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
458 spin_unlock_irqrestore(&up->port.lock, flags);
459 pm_runtime_mark_last_busy(up->dev);
460 pm_runtime_put_autosuspend(up->dev);
464 static unsigned int serial_omap_get_mctrl(struct uart_port *port)
466 struct uart_omap_port *up = to_uart_omap_port(port);
468 unsigned int ret = 0;
470 pm_runtime_get_sync(up->dev);
471 status = check_modem_status(up);
472 pm_runtime_mark_last_busy(up->dev);
473 pm_runtime_put_autosuspend(up->dev);
475 dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->port.line);
477 if (status & UART_MSR_DCD)
479 if (status & UART_MSR_RI)
481 if (status & UART_MSR_DSR)
483 if (status & UART_MSR_CTS)
488 static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
490 struct uart_omap_port *up = to_uart_omap_port(port);
491 unsigned char mcr = 0;
493 dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->port.line);
494 if (mctrl & TIOCM_RTS)
496 if (mctrl & TIOCM_DTR)
498 if (mctrl & TIOCM_OUT1)
499 mcr |= UART_MCR_OUT1;
500 if (mctrl & TIOCM_OUT2)
501 mcr |= UART_MCR_OUT2;
502 if (mctrl & TIOCM_LOOP)
503 mcr |= UART_MCR_LOOP;
505 pm_runtime_get_sync(up->dev);
506 up->mcr = serial_in(up, UART_MCR);
508 serial_out(up, UART_MCR, up->mcr);
509 pm_runtime_mark_last_busy(up->dev);
510 pm_runtime_put_autosuspend(up->dev);
512 if (gpio_is_valid(up->DTR_gpio) &&
513 !!(mctrl & TIOCM_DTR) != up->DTR_active) {
514 up->DTR_active = !up->DTR_active;
515 if (gpio_cansleep(up->DTR_gpio))
516 schedule_work(&up->qos_work);
518 gpio_set_value(up->DTR_gpio,
519 up->DTR_active != up->DTR_inverted);
523 static void serial_omap_break_ctl(struct uart_port *port, int break_state)
525 struct uart_omap_port *up = to_uart_omap_port(port);
526 unsigned long flags = 0;
528 dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->port.line);
529 pm_runtime_get_sync(up->dev);
530 spin_lock_irqsave(&up->port.lock, flags);
531 if (break_state == -1)
532 up->lcr |= UART_LCR_SBC;
534 up->lcr &= ~UART_LCR_SBC;
535 serial_out(up, UART_LCR, up->lcr);
536 spin_unlock_irqrestore(&up->port.lock, flags);
537 pm_runtime_mark_last_busy(up->dev);
538 pm_runtime_put_autosuspend(up->dev);
541 static int serial_omap_startup(struct uart_port *port)
543 struct uart_omap_port *up = to_uart_omap_port(port);
544 unsigned long flags = 0;
550 retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags,
555 dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line);
557 pm_runtime_get_sync(up->dev);
559 * Clear the FIFO buffers and disable them.
560 * (they will be reenabled in set_termios())
562 serial_omap_clear_fifos(up);
563 /* For Hardware flow control */
564 serial_out(up, UART_MCR, UART_MCR_RTS);
567 * Clear the interrupt registers.
569 (void) serial_in(up, UART_LSR);
570 if (serial_in(up, UART_LSR) & UART_LSR_DR)
571 (void) serial_in(up, UART_RX);
572 (void) serial_in(up, UART_IIR);
573 (void) serial_in(up, UART_MSR);
576 * Now, initialize the UART
578 serial_out(up, UART_LCR, UART_LCR_WLEN8);
579 spin_lock_irqsave(&up->port.lock, flags);
581 * Most PC uarts need OUT2 raised to enable interrupts.
583 up->port.mctrl |= TIOCM_OUT2;
584 serial_omap_set_mctrl(&up->port, up->port.mctrl);
585 spin_unlock_irqrestore(&up->port.lock, flags);
587 up->msr_saved_flags = 0;
589 * Finally, enable interrupts. Note: Modem status interrupts
590 * are set via set_termios(), which will be occurring imminently
591 * anyway, so we don't enable them here.
593 up->ier = UART_IER_RLSI | UART_IER_RDI;
594 serial_out(up, UART_IER, up->ier);
596 /* Enable module level wake up */
597 serial_out(up, UART_OMAP_WER, OMAP_UART_WER_MOD_WKUP);
599 pm_runtime_mark_last_busy(up->dev);
600 pm_runtime_put_autosuspend(up->dev);
601 up->port_activity = jiffies;
605 static void serial_omap_shutdown(struct uart_port *port)
607 struct uart_omap_port *up = to_uart_omap_port(port);
608 unsigned long flags = 0;
610 dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->port.line);
612 pm_runtime_get_sync(up->dev);
614 * Disable interrupts from this port
617 serial_out(up, UART_IER, 0);
619 spin_lock_irqsave(&up->port.lock, flags);
620 up->port.mctrl &= ~TIOCM_OUT2;
621 serial_omap_set_mctrl(&up->port, up->port.mctrl);
622 spin_unlock_irqrestore(&up->port.lock, flags);
625 * Disable break condition and FIFOs
627 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
628 serial_omap_clear_fifos(up);
631 * Read data port to reset things, and then free the irq
633 if (serial_in(up, UART_LSR) & UART_LSR_DR)
634 (void) serial_in(up, UART_RX);
636 pm_runtime_mark_last_busy(up->dev);
637 pm_runtime_put_autosuspend(up->dev);
638 free_irq(up->port.irq, up);
642 serial_omap_configure_xonxoff
643 (struct uart_omap_port *up, struct ktermios *termios)
645 up->lcr = serial_in(up, UART_LCR);
646 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
647 up->efr = serial_in(up, UART_EFR);
648 serial_out(up, UART_EFR, up->efr & ~UART_EFR_ECB);
650 serial_out(up, UART_XON1, termios->c_cc[VSTART]);
651 serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]);
653 /* clear SW control mode bits */
654 up->efr &= OMAP_UART_SW_CLR;
658 * Flow control for OMAP.TX
659 * OMAP.RX should listen for XON/XOFF
661 if (termios->c_iflag & IXON)
662 up->efr |= OMAP_UART_SW_RX;
666 * Flow control for OMAP.RX
667 * OMAP.TX should send XON/XOFF
669 if (termios->c_iflag & IXOFF)
670 up->efr |= OMAP_UART_SW_TX;
672 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
673 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
675 up->mcr = serial_in(up, UART_MCR);
679 * Enable any character to restart output.
680 * Operation resumes after receiving any
681 * character after recognition of the XOFF character
683 if (termios->c_iflag & IXANY)
684 up->mcr |= UART_MCR_XONANY;
686 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
687 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
688 serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
689 /* Enable special char function UARTi.EFR_REG[5] and
690 * load the new software flow control mode IXON or IXOFF
691 * and restore the UARTi.EFR_REG[4] ENHANCED_EN value.
693 serial_out(up, UART_EFR, up->efr | UART_EFR_SCD);
694 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
696 serial_out(up, UART_MCR, up->mcr & ~UART_MCR_TCRTLR);
697 serial_out(up, UART_LCR, up->lcr);
700 static void serial_omap_uart_qos_work(struct work_struct *work)
702 struct uart_omap_port *up = container_of(work, struct uart_omap_port,
705 pm_qos_update_request(&up->pm_qos_request, up->latency);
706 if (gpio_is_valid(up->DTR_gpio))
707 gpio_set_value_cansleep(up->DTR_gpio,
708 up->DTR_active != up->DTR_inverted);
712 serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
713 struct ktermios *old)
715 struct uart_omap_port *up = to_uart_omap_port(port);
716 unsigned char cval = 0;
717 unsigned char efr = 0;
718 unsigned long flags = 0;
719 unsigned int baud, quot;
721 switch (termios->c_cflag & CSIZE) {
723 cval = UART_LCR_WLEN5;
726 cval = UART_LCR_WLEN6;
729 cval = UART_LCR_WLEN7;
733 cval = UART_LCR_WLEN8;
737 if (termios->c_cflag & CSTOPB)
738 cval |= UART_LCR_STOP;
739 if (termios->c_cflag & PARENB)
740 cval |= UART_LCR_PARITY;
741 if (!(termios->c_cflag & PARODD))
742 cval |= UART_LCR_EPAR;
745 * Ask the core to calculate the divisor for us.
748 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13);
749 quot = serial_omap_get_divisor(port, baud);
751 /* calculate wakeup latency constraint */
752 up->calc_latency = (USEC_PER_SEC * up->port.fifosize) / (baud / 8);
753 up->latency = up->calc_latency;
754 schedule_work(&up->qos_work);
756 up->dll = quot & 0xff;
758 up->mdr1 = UART_OMAP_MDR1_DISABLE;
760 up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 |
761 UART_FCR_ENABLE_FIFO;
764 * Ok, we're now changing the port state. Do it with
765 * interrupts disabled.
767 pm_runtime_get_sync(up->dev);
768 spin_lock_irqsave(&up->port.lock, flags);
771 * Update the per-port timeout.
773 uart_update_timeout(port, termios->c_cflag, baud);
775 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
776 if (termios->c_iflag & INPCK)
777 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
778 if (termios->c_iflag & (BRKINT | PARMRK))
779 up->port.read_status_mask |= UART_LSR_BI;
782 * Characters to ignore
784 up->port.ignore_status_mask = 0;
785 if (termios->c_iflag & IGNPAR)
786 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
787 if (termios->c_iflag & IGNBRK) {
788 up->port.ignore_status_mask |= UART_LSR_BI;
790 * If we're ignoring parity and break indicators,
791 * ignore overruns too (for real raw support).
793 if (termios->c_iflag & IGNPAR)
794 up->port.ignore_status_mask |= UART_LSR_OE;
798 * ignore all characters if CREAD is not set
800 if ((termios->c_cflag & CREAD) == 0)
801 up->port.ignore_status_mask |= UART_LSR_DR;
804 * Modem status interrupts
806 up->ier &= ~UART_IER_MSI;
807 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
808 up->ier |= UART_IER_MSI;
809 serial_out(up, UART_IER, up->ier);
810 serial_out(up, UART_LCR, cval); /* reset DLAB */
812 up->scr = OMAP_UART_SCR_TX_EMPTY;
814 /* FIFOs and DMA Settings */
816 /* FCR can be changed only when the
817 * baud clock is not running
818 * DLL_REG and DLH_REG set to 0.
820 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
821 serial_out(up, UART_DLL, 0);
822 serial_out(up, UART_DLM, 0);
823 serial_out(up, UART_LCR, 0);
825 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
827 up->efr = serial_in(up, UART_EFR);
828 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
830 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
831 up->mcr = serial_in(up, UART_MCR);
832 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
833 /* FIFO ENABLE, DMA MODE */
835 up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK;
837 /* Set receive FIFO threshold to 16 characters and
838 * transmit FIFO threshold to 16 spaces
840 up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK;
841 up->fcr &= ~OMAP_UART_FCR_TX_FIFO_TRIG_MASK;
842 up->fcr |= UART_FCR6_R_TRIGGER_16 | UART_FCR6_T_TRIGGER_24 |
843 UART_FCR_ENABLE_FIFO;
845 serial_out(up, UART_FCR, up->fcr);
846 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
848 serial_out(up, UART_OMAP_SCR, up->scr);
850 serial_out(up, UART_EFR, up->efr);
851 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
852 serial_out(up, UART_MCR, up->mcr);
854 /* Protocol, Baud Rate, and Interrupt Settings */
856 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
857 serial_omap_mdr1_errataset(up, up->mdr1);
859 serial_out(up, UART_OMAP_MDR1, up->mdr1);
861 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
863 up->efr = serial_in(up, UART_EFR);
864 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
866 serial_out(up, UART_LCR, 0);
867 serial_out(up, UART_IER, 0);
868 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
870 serial_out(up, UART_DLL, up->dll); /* LS of divisor */
871 serial_out(up, UART_DLM, up->dlh); /* MS of divisor */
873 serial_out(up, UART_LCR, 0);
874 serial_out(up, UART_IER, up->ier);
875 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
877 serial_out(up, UART_EFR, up->efr);
878 serial_out(up, UART_LCR, cval);
880 if (baud > 230400 && baud != 3000000)
881 up->mdr1 = UART_OMAP_MDR1_13X_MODE;
883 up->mdr1 = UART_OMAP_MDR1_16X_MODE;
885 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
886 serial_omap_mdr1_errataset(up, up->mdr1);
888 serial_out(up, UART_OMAP_MDR1, up->mdr1);
890 /* Hardware Flow Control Configuration */
892 if (termios->c_cflag & CRTSCTS) {
893 efr |= (UART_EFR_CTS | UART_EFR_RTS);
894 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
896 up->mcr = serial_in(up, UART_MCR);
897 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
899 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
900 up->efr = serial_in(up, UART_EFR);
901 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
903 serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
904 serial_out(up, UART_EFR, efr); /* Enable AUTORTS and AUTOCTS */
905 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
906 serial_out(up, UART_MCR, up->mcr | UART_MCR_RTS);
907 serial_out(up, UART_LCR, cval);
910 serial_omap_set_mctrl(&up->port, up->port.mctrl);
911 /* Software Flow Control Configuration */
912 serial_omap_configure_xonxoff(up, termios);
914 spin_unlock_irqrestore(&up->port.lock, flags);
915 pm_runtime_mark_last_busy(up->dev);
916 pm_runtime_put_autosuspend(up->dev);
917 dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->port.line);
920 static int serial_omap_set_wake(struct uart_port *port, unsigned int state)
922 struct uart_omap_port *up = to_uart_omap_port(port);
924 serial_omap_enable_wakeup(up, state);
930 serial_omap_pm(struct uart_port *port, unsigned int state,
931 unsigned int oldstate)
933 struct uart_omap_port *up = to_uart_omap_port(port);
936 dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->port.line);
938 pm_runtime_get_sync(up->dev);
939 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
940 efr = serial_in(up, UART_EFR);
941 serial_out(up, UART_EFR, efr | UART_EFR_ECB);
942 serial_out(up, UART_LCR, 0);
944 serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0);
945 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
946 serial_out(up, UART_EFR, efr);
947 serial_out(up, UART_LCR, 0);
949 if (!device_may_wakeup(up->dev)) {
951 pm_runtime_forbid(up->dev);
953 pm_runtime_allow(up->dev);
956 pm_runtime_mark_last_busy(up->dev);
957 pm_runtime_put_autosuspend(up->dev);
960 static void serial_omap_release_port(struct uart_port *port)
962 dev_dbg(port->dev, "serial_omap_release_port+\n");
965 static int serial_omap_request_port(struct uart_port *port)
967 dev_dbg(port->dev, "serial_omap_request_port+\n");
971 static void serial_omap_config_port(struct uart_port *port, int flags)
973 struct uart_omap_port *up = to_uart_omap_port(port);
975 dev_dbg(up->port.dev, "serial_omap_config_port+%d\n",
977 up->port.type = PORT_OMAP;
981 serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser)
983 /* we don't want the core code to modify any port params */
984 dev_dbg(port->dev, "serial_omap_verify_port+\n");
989 serial_omap_type(struct uart_port *port)
991 struct uart_omap_port *up = to_uart_omap_port(port);
993 dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->port.line);
997 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
999 static inline void wait_for_xmitr(struct uart_omap_port *up)
1001 unsigned int status, tmout = 10000;
1003 /* Wait up to 10ms for the character(s) to be sent. */
1005 status = serial_in(up, UART_LSR);
1007 if (status & UART_LSR_BI)
1008 up->lsr_break_flag = UART_LSR_BI;
1013 } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
1015 /* Wait up to 1s for flow control if necessary */
1016 if (up->port.flags & UPF_CONS_FLOW) {
1018 for (tmout = 1000000; tmout; tmout--) {
1019 unsigned int msr = serial_in(up, UART_MSR);
1021 up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
1022 if (msr & UART_MSR_CTS)
1030 #ifdef CONFIG_CONSOLE_POLL
1032 static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch)
1034 struct uart_omap_port *up = to_uart_omap_port(port);
1036 pm_runtime_get_sync(up->dev);
1038 serial_out(up, UART_TX, ch);
1039 pm_runtime_mark_last_busy(up->dev);
1040 pm_runtime_put_autosuspend(up->dev);
1043 static int serial_omap_poll_get_char(struct uart_port *port)
1045 struct uart_omap_port *up = to_uart_omap_port(port);
1046 unsigned int status;
1048 pm_runtime_get_sync(up->dev);
1049 status = serial_in(up, UART_LSR);
1050 if (!(status & UART_LSR_DR)) {
1051 status = NO_POLL_CHAR;
1055 status = serial_in(up, UART_RX);
1058 pm_runtime_mark_last_busy(up->dev);
1059 pm_runtime_put_autosuspend(up->dev);
1064 #endif /* CONFIG_CONSOLE_POLL */
1066 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
1068 static struct uart_omap_port *serial_omap_console_ports[4];
1070 static struct uart_driver serial_omap_reg;
1072 static void serial_omap_console_putchar(struct uart_port *port, int ch)
1074 struct uart_omap_port *up = to_uart_omap_port(port);
1077 serial_out(up, UART_TX, ch);
1081 serial_omap_console_write(struct console *co, const char *s,
1084 struct uart_omap_port *up = serial_omap_console_ports[co->index];
1085 unsigned long flags;
1089 pm_runtime_get_sync(up->dev);
1091 local_irq_save(flags);
1094 else if (oops_in_progress)
1095 locked = spin_trylock(&up->port.lock);
1097 spin_lock(&up->port.lock);
1100 * First save the IER then disable the interrupts
1102 ier = serial_in(up, UART_IER);
1103 serial_out(up, UART_IER, 0);
1105 uart_console_write(&up->port, s, count, serial_omap_console_putchar);
1108 * Finally, wait for transmitter to become empty
1109 * and restore the IER
1112 serial_out(up, UART_IER, ier);
1114 * The receive handling will happen properly because the
1115 * receive ready bit will still be set; it is not cleared
1116 * on read. However, modem control will not, we must
1117 * call it if we have saved something in the saved flags
1118 * while processing with interrupts off.
1120 if (up->msr_saved_flags)
1121 check_modem_status(up);
1123 pm_runtime_mark_last_busy(up->dev);
1124 pm_runtime_put_autosuspend(up->dev);
1126 spin_unlock(&up->port.lock);
1127 local_irq_restore(flags);
1131 serial_omap_console_setup(struct console *co, char *options)
1133 struct uart_omap_port *up;
1139 if (serial_omap_console_ports[co->index] == NULL)
1141 up = serial_omap_console_ports[co->index];
1144 uart_parse_options(options, &baud, &parity, &bits, &flow);
1146 return uart_set_options(&up->port, co, baud, parity, bits, flow);
1149 static struct console serial_omap_console = {
1150 .name = OMAP_SERIAL_NAME,
1151 .write = serial_omap_console_write,
1152 .device = uart_console_device,
1153 .setup = serial_omap_console_setup,
1154 .flags = CON_PRINTBUFFER,
1156 .data = &serial_omap_reg,
1159 static void serial_omap_add_console_port(struct uart_omap_port *up)
1161 serial_omap_console_ports[up->port.line] = up;
1164 #define OMAP_CONSOLE (&serial_omap_console)
1168 #define OMAP_CONSOLE NULL
1170 static inline void serial_omap_add_console_port(struct uart_omap_port *up)
1175 static struct uart_ops serial_omap_pops = {
1176 .tx_empty = serial_omap_tx_empty,
1177 .set_mctrl = serial_omap_set_mctrl,
1178 .get_mctrl = serial_omap_get_mctrl,
1179 .stop_tx = serial_omap_stop_tx,
1180 .start_tx = serial_omap_start_tx,
1181 .stop_rx = serial_omap_stop_rx,
1182 .enable_ms = serial_omap_enable_ms,
1183 .break_ctl = serial_omap_break_ctl,
1184 .startup = serial_omap_startup,
1185 .shutdown = serial_omap_shutdown,
1186 .set_termios = serial_omap_set_termios,
1187 .pm = serial_omap_pm,
1188 .set_wake = serial_omap_set_wake,
1189 .type = serial_omap_type,
1190 .release_port = serial_omap_release_port,
1191 .request_port = serial_omap_request_port,
1192 .config_port = serial_omap_config_port,
1193 .verify_port = serial_omap_verify_port,
1194 #ifdef CONFIG_CONSOLE_POLL
1195 .poll_put_char = serial_omap_poll_put_char,
1196 .poll_get_char = serial_omap_poll_get_char,
1200 static struct uart_driver serial_omap_reg = {
1201 .owner = THIS_MODULE,
1202 .driver_name = "OMAP-SERIAL",
1203 .dev_name = OMAP_SERIAL_NAME,
1204 .nr = OMAP_MAX_HSUART_PORTS,
1205 .cons = OMAP_CONSOLE,
1208 #ifdef CONFIG_PM_SLEEP
1209 static int serial_omap_suspend(struct device *dev)
1211 struct uart_omap_port *up = dev_get_drvdata(dev);
1214 uart_suspend_port(&serial_omap_reg, &up->port);
1215 flush_work_sync(&up->qos_work);
1221 static int serial_omap_resume(struct device *dev)
1223 struct uart_omap_port *up = dev_get_drvdata(dev);
1226 uart_resume_port(&serial_omap_reg, &up->port);
1231 static void __devinit omap_serial_fill_features_erratas(struct uart_omap_port *up)
1234 u16 revision, major, minor;
1236 mvr = serial_in(up, UART_OMAP_MVER);
1238 /* Check revision register scheme */
1239 scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT;
1242 case 0: /* Legacy Scheme: OMAP2/3 */
1243 /* MINOR_REV[0:4], MAJOR_REV[4:7] */
1244 major = (mvr & OMAP_UART_LEGACY_MVR_MAJ_MASK) >>
1245 OMAP_UART_LEGACY_MVR_MAJ_SHIFT;
1246 minor = (mvr & OMAP_UART_LEGACY_MVR_MIN_MASK);
1249 /* New Scheme: OMAP4+ */
1250 /* MINOR_REV[0:5], MAJOR_REV[8:10] */
1251 major = (mvr & OMAP_UART_MVR_MAJ_MASK) >>
1252 OMAP_UART_MVR_MAJ_SHIFT;
1253 minor = (mvr & OMAP_UART_MVR_MIN_MASK);
1257 "Unknown %s revision, defaulting to highest\n",
1259 /* highest possible revision */
1264 /* normalize revision for the driver */
1265 revision = UART_BUILD_REVISION(major, minor);
1268 case OMAP_UART_REV_46:
1269 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1270 UART_ERRATA_i291_DMA_FORCEIDLE);
1272 case OMAP_UART_REV_52:
1273 up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
1274 UART_ERRATA_i291_DMA_FORCEIDLE);
1276 case OMAP_UART_REV_63:
1277 up->errata |= UART_ERRATA_i202_MDR1_ACCESS;
1284 static __devinit struct omap_uart_port_info *of_get_uart_port_info(struct device *dev)
1286 struct omap_uart_port_info *omap_up_info;
1288 omap_up_info = devm_kzalloc(dev, sizeof(*omap_up_info), GFP_KERNEL);
1290 return NULL; /* out of memory */
1292 of_property_read_u32(dev->of_node, "clock-frequency",
1293 &omap_up_info->uartclk);
1294 return omap_up_info;
1297 static int __devinit serial_omap_probe(struct platform_device *pdev)
1299 struct uart_omap_port *up;
1300 struct resource *mem, *irq;
1301 struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data;
1304 if (pdev->dev.of_node)
1305 omap_up_info = of_get_uart_port_info(&pdev->dev);
1307 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1309 dev_err(&pdev->dev, "no mem resource?\n");
1313 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1315 dev_err(&pdev->dev, "no irq resource?\n");
1319 if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem),
1320 pdev->dev.driver->name)) {
1321 dev_err(&pdev->dev, "memory region already claimed\n");
1325 if (gpio_is_valid(omap_up_info->DTR_gpio) &&
1326 omap_up_info->DTR_present) {
1327 ret = gpio_request(omap_up_info->DTR_gpio, "omap-serial");
1330 ret = gpio_direction_output(omap_up_info->DTR_gpio,
1331 omap_up_info->DTR_inverted);
1336 up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL);
1340 if (gpio_is_valid(omap_up_info->DTR_gpio) &&
1341 omap_up_info->DTR_present) {
1342 up->DTR_gpio = omap_up_info->DTR_gpio;
1343 up->DTR_inverted = omap_up_info->DTR_inverted;
1345 up->DTR_gpio = -EINVAL;
1348 up->dev = &pdev->dev;
1349 up->port.dev = &pdev->dev;
1350 up->port.type = PORT_OMAP;
1351 up->port.iotype = UPIO_MEM;
1352 up->port.irq = irq->start;
1354 up->port.regshift = 2;
1355 up->port.fifosize = 64;
1356 up->port.ops = &serial_omap_pops;
1358 if (pdev->dev.of_node)
1359 up->port.line = of_alias_get_id(pdev->dev.of_node, "serial");
1361 up->port.line = pdev->id;
1363 if (up->port.line < 0) {
1364 dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n",
1370 sprintf(up->name, "OMAP UART%d", up->port.line);
1371 up->port.mapbase = mem->start;
1372 up->port.membase = devm_ioremap(&pdev->dev, mem->start,
1373 resource_size(mem));
1374 if (!up->port.membase) {
1375 dev_err(&pdev->dev, "can't ioremap UART\n");
1380 up->port.flags = omap_up_info->flags;
1381 up->port.uartclk = omap_up_info->uartclk;
1382 if (!up->port.uartclk) {
1383 up->port.uartclk = DEFAULT_CLK_SPEED;
1384 dev_warn(&pdev->dev, "No clock speed specified: using default:"
1385 "%d\n", DEFAULT_CLK_SPEED);
1388 up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1389 up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1390 pm_qos_add_request(&up->pm_qos_request,
1391 PM_QOS_CPU_DMA_LATENCY, up->latency);
1392 serial_omap_uart_wq = create_singlethread_workqueue(up->name);
1393 INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
1395 platform_set_drvdata(pdev, up);
1396 pm_runtime_enable(&pdev->dev);
1397 pm_runtime_use_autosuspend(&pdev->dev);
1398 pm_runtime_set_autosuspend_delay(&pdev->dev,
1399 omap_up_info->autosuspend_timeout);
1401 pm_runtime_irq_safe(&pdev->dev);
1402 pm_runtime_get_sync(&pdev->dev);
1404 omap_serial_fill_features_erratas(up);
1406 ui[up->port.line] = up;
1407 serial_omap_add_console_port(up);
1409 ret = uart_add_one_port(&serial_omap_reg, &up->port);
1413 pm_runtime_mark_last_busy(up->dev);
1414 pm_runtime_put_autosuspend(up->dev);
1418 pm_runtime_put(&pdev->dev);
1419 pm_runtime_disable(&pdev->dev);
1422 dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n",
1423 pdev->id, __func__, ret);
1427 static int __devexit serial_omap_remove(struct platform_device *dev)
1429 struct uart_omap_port *up = platform_get_drvdata(dev);
1431 pm_runtime_put_sync(up->dev);
1432 pm_runtime_disable(up->dev);
1433 uart_remove_one_port(&serial_omap_reg, &up->port);
1434 pm_qos_remove_request(&up->pm_qos_request);
1440 * Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460)
1441 * The access to uart register after MDR1 Access
1442 * causes UART to corrupt data.
1445 * 5 L4 clock cycles + 5 UART functional clock cycle (@48MHz = ~0.2uS)
1446 * give 10 times as much
1448 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1)
1452 serial_out(up, UART_OMAP_MDR1, mdr1);
1454 serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_XMIT |
1455 UART_FCR_CLEAR_RCVR);
1457 * Wait for FIFO to empty: when empty, RX_FIFO_E bit is 0 and
1458 * TX_FIFO_E bit is 1.
1460 while (UART_LSR_THRE != (serial_in(up, UART_LSR) &
1461 (UART_LSR_THRE | UART_LSR_DR))) {
1464 /* Should *never* happen. we warn and carry on */
1465 dev_crit(up->dev, "Errata i202: timedout %x\n",
1466 serial_in(up, UART_LSR));
1473 #ifdef CONFIG_PM_RUNTIME
1474 static void serial_omap_restore_context(struct uart_omap_port *up)
1476 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1477 serial_omap_mdr1_errataset(up, UART_OMAP_MDR1_DISABLE);
1479 serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE);
1481 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1482 serial_out(up, UART_EFR, UART_EFR_ECB);
1483 serial_out(up, UART_LCR, 0x0); /* Operational mode */
1484 serial_out(up, UART_IER, 0x0);
1485 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1486 serial_out(up, UART_DLL, up->dll);
1487 serial_out(up, UART_DLM, up->dlh);
1488 serial_out(up, UART_LCR, 0x0); /* Operational mode */
1489 serial_out(up, UART_IER, up->ier);
1490 serial_out(up, UART_FCR, up->fcr);
1491 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
1492 serial_out(up, UART_MCR, up->mcr);
1493 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1494 serial_out(up, UART_OMAP_SCR, up->scr);
1495 serial_out(up, UART_EFR, up->efr);
1496 serial_out(up, UART_LCR, up->lcr);
1497 if (up->errata & UART_ERRATA_i202_MDR1_ACCESS)
1498 serial_omap_mdr1_errataset(up, up->mdr1);
1500 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1503 static int serial_omap_runtime_suspend(struct device *dev)
1505 struct uart_omap_port *up = dev_get_drvdata(dev);
1506 struct omap_uart_port_info *pdata = dev->platform_data;
1514 up->context_loss_cnt = serial_omap_get_context_loss_count(up);
1516 if (device_may_wakeup(dev)) {
1517 if (!up->wakeups_enabled) {
1518 serial_omap_enable_wakeup(up, true);
1519 up->wakeups_enabled = true;
1522 if (up->wakeups_enabled) {
1523 serial_omap_enable_wakeup(up, false);
1524 up->wakeups_enabled = false;
1528 up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
1529 schedule_work(&up->qos_work);
1534 static int serial_omap_runtime_resume(struct device *dev)
1536 struct uart_omap_port *up = dev_get_drvdata(dev);
1537 struct omap_uart_port_info *pdata = dev->platform_data;
1540 u32 loss_cnt = serial_omap_get_context_loss_count(up);
1542 if (up->context_loss_cnt != loss_cnt)
1543 serial_omap_restore_context(up);
1545 up->latency = up->calc_latency;
1546 schedule_work(&up->qos_work);
1553 static const struct dev_pm_ops serial_omap_dev_pm_ops = {
1554 SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume)
1555 SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend,
1556 serial_omap_runtime_resume, NULL)
1559 #if defined(CONFIG_OF)
1560 static const struct of_device_id omap_serial_of_match[] = {
1561 { .compatible = "ti,omap2-uart" },
1562 { .compatible = "ti,omap3-uart" },
1563 { .compatible = "ti,omap4-uart" },
1566 MODULE_DEVICE_TABLE(of, omap_serial_of_match);
1569 static struct platform_driver serial_omap_driver = {
1570 .probe = serial_omap_probe,
1571 .remove = __devexit_p(serial_omap_remove),
1573 .name = DRIVER_NAME,
1574 .pm = &serial_omap_dev_pm_ops,
1575 .of_match_table = of_match_ptr(omap_serial_of_match),
1579 static int __init serial_omap_init(void)
1583 ret = uart_register_driver(&serial_omap_reg);
1586 ret = platform_driver_register(&serial_omap_driver);
1588 uart_unregister_driver(&serial_omap_reg);
1592 static void __exit serial_omap_exit(void)
1594 platform_driver_unregister(&serial_omap_driver);
1595 uart_unregister_driver(&serial_omap_reg);
1598 module_init(serial_omap_init);
1599 module_exit(serial_omap_exit);
1601 MODULE_DESCRIPTION("OMAP High Speed UART driver");
1602 MODULE_LICENSE("GPL");
1603 MODULE_AUTHOR("Texas Instruments Inc");