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>
36 #include <linux/dma-mapping.h>
37 #include <linux/clk.h>
38 #include <linux/serial_core.h>
39 #include <linux/irq.h>
40 #include <linux/pm_runtime.h>
43 #include <plat/dmtimer.h>
44 #include <plat/omap-serial.h>
46 #define OMAP_UART_AUTOSUSPEND_DELAY -1
48 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
50 /* Forward declaration of functions */
51 static void uart_tx_dma_callback(int lch, u16 ch_status, void *data);
52 static void serial_omap_rx_timeout(unsigned long uart_no);
53 static int serial_omap_start_rxdma(struct uart_omap_port *up);
55 static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
57 offset <<= up->port.regshift;
58 return readw(up->port.membase + offset);
61 static inline void serial_out(struct uart_omap_port *up, int offset, int value)
63 offset <<= up->port.regshift;
64 writew(value, up->port.membase + offset);
67 static inline void serial_omap_clear_fifos(struct uart_omap_port *up)
69 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
70 serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
71 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
72 serial_out(up, UART_FCR, 0);
76 * serial_omap_get_divisor - calculate divisor value
77 * @port: uart port info
78 * @baud: baudrate for which divisor needs to be calculated.
80 * We have written our own function to get the divisor so as to support
81 * 13x mode. 3Mbps Baudrate as an different divisor.
82 * Reference OMAP TRM Chapter 17:
83 * Table 17-1. UART Mode Baud Rates, Divisor Values, and Error Rates
84 * referring to oversampling - divisor value
85 * baudrate 460,800 to 3,686,400 all have divisor 13
86 * except 3,000,000 which has divisor value 16
89 serial_omap_get_divisor(struct uart_port *port, unsigned int baud)
93 if (baud > OMAP_MODE13X_SPEED && baud != 3000000)
97 return port->uartclk/(baud * divisor);
100 static void serial_omap_stop_rxdma(struct uart_omap_port *up)
102 if (up->uart_dma.rx_dma_used) {
103 del_timer(&up->uart_dma.rx_timer);
104 omap_stop_dma(up->uart_dma.rx_dma_channel);
105 omap_free_dma(up->uart_dma.rx_dma_channel);
106 up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE;
107 up->uart_dma.rx_dma_used = false;
108 pm_runtime_mark_last_busy(&up->pdev->dev);
109 pm_runtime_put_autosuspend(&up->pdev->dev);
113 static void serial_omap_enable_ms(struct uart_port *port)
115 struct uart_omap_port *up = (struct uart_omap_port *)port;
117 dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->pdev->id);
119 pm_runtime_get_sync(&up->pdev->dev);
120 up->ier |= UART_IER_MSI;
121 serial_out(up, UART_IER, up->ier);
122 pm_runtime_put(&up->pdev->dev);
125 static void serial_omap_stop_tx(struct uart_port *port)
127 struct uart_omap_port *up = (struct uart_omap_port *)port;
130 up->uart_dma.tx_dma_channel != OMAP_UART_DMA_CH_FREE) {
132 * Check if dma is still active. If yes do nothing,
133 * return. Else stop dma
135 if (omap_get_dma_active_status(up->uart_dma.tx_dma_channel))
137 omap_stop_dma(up->uart_dma.tx_dma_channel);
138 omap_free_dma(up->uart_dma.tx_dma_channel);
139 up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE;
140 pm_runtime_mark_last_busy(&up->pdev->dev);
141 pm_runtime_put_autosuspend(&up->pdev->dev);
144 pm_runtime_get_sync(&up->pdev->dev);
145 if (up->ier & UART_IER_THRI) {
146 up->ier &= ~UART_IER_THRI;
147 serial_out(up, UART_IER, up->ier);
150 pm_runtime_mark_last_busy(&up->pdev->dev);
151 pm_runtime_put_autosuspend(&up->pdev->dev);
154 static void serial_omap_stop_rx(struct uart_port *port)
156 struct uart_omap_port *up = (struct uart_omap_port *)port;
158 pm_runtime_get_sync(&up->pdev->dev);
160 serial_omap_stop_rxdma(up);
161 up->ier &= ~UART_IER_RLSI;
162 up->port.read_status_mask &= ~UART_LSR_DR;
163 serial_out(up, UART_IER, up->ier);
164 pm_runtime_mark_last_busy(&up->pdev->dev);
165 pm_runtime_put_autosuspend(&up->pdev->dev);
168 static inline void receive_chars(struct uart_omap_port *up, int *status)
170 struct tty_struct *tty = up->port.state->port.tty;
172 unsigned char ch, lsr = *status;
176 if (likely(lsr & UART_LSR_DR))
177 ch = serial_in(up, UART_RX);
179 up->port.icount.rx++;
181 if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) {
183 * For statistics only
185 if (lsr & UART_LSR_BI) {
186 lsr &= ~(UART_LSR_FE | UART_LSR_PE);
187 up->port.icount.brk++;
189 * We do the SysRQ and SAK checking
190 * here because otherwise the break
191 * may get masked by ignore_status_mask
192 * or read_status_mask.
194 if (uart_handle_break(&up->port))
196 } else if (lsr & UART_LSR_PE) {
197 up->port.icount.parity++;
198 } else if (lsr & UART_LSR_FE) {
199 up->port.icount.frame++;
202 if (lsr & UART_LSR_OE)
203 up->port.icount.overrun++;
206 * Mask off conditions which should be ignored.
208 lsr &= up->port.read_status_mask;
210 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
211 if (up->port.line == up->port.cons->index) {
212 /* Recover the break flag from console xmit */
213 lsr |= up->lsr_break_flag;
216 if (lsr & UART_LSR_BI)
218 else if (lsr & UART_LSR_PE)
220 else if (lsr & UART_LSR_FE)
224 if (uart_handle_sysrq_char(&up->port, ch))
226 uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
228 lsr = serial_in(up, UART_LSR);
229 } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0));
230 spin_unlock(&up->port.lock);
231 tty_flip_buffer_push(tty);
232 spin_lock(&up->port.lock);
235 static void transmit_chars(struct uart_omap_port *up)
237 struct circ_buf *xmit = &up->port.state->xmit;
240 if (up->port.x_char) {
241 serial_out(up, UART_TX, up->port.x_char);
242 up->port.icount.tx++;
246 if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
247 serial_omap_stop_tx(&up->port);
250 count = up->port.fifosize / 4;
252 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
253 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
254 up->port.icount.tx++;
255 if (uart_circ_empty(xmit))
257 } while (--count > 0);
259 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
260 uart_write_wakeup(&up->port);
262 if (uart_circ_empty(xmit))
263 serial_omap_stop_tx(&up->port);
266 static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
268 if (!(up->ier & UART_IER_THRI)) {
269 up->ier |= UART_IER_THRI;
270 serial_out(up, UART_IER, up->ier);
274 static void serial_omap_start_tx(struct uart_port *port)
276 struct uart_omap_port *up = (struct uart_omap_port *)port;
277 struct circ_buf *xmit;
282 pm_runtime_get_sync(&up->pdev->dev);
283 serial_omap_enable_ier_thri(up);
284 pm_runtime_mark_last_busy(&up->pdev->dev);
285 pm_runtime_put_autosuspend(&up->pdev->dev);
289 if (up->uart_dma.tx_dma_used)
292 xmit = &up->port.state->xmit;
294 if (up->uart_dma.tx_dma_channel == OMAP_UART_DMA_CH_FREE) {
295 pm_runtime_get_sync(&up->pdev->dev);
296 ret = omap_request_dma(up->uart_dma.uart_dma_tx,
298 (void *)uart_tx_dma_callback, up,
299 &(up->uart_dma.tx_dma_channel));
302 serial_omap_enable_ier_thri(up);
306 spin_lock(&(up->uart_dma.tx_lock));
307 up->uart_dma.tx_dma_used = true;
308 spin_unlock(&(up->uart_dma.tx_lock));
310 start = up->uart_dma.tx_buf_dma_phys +
311 (xmit->tail & (UART_XMIT_SIZE - 1));
313 up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit);
315 * It is a circular buffer. See if the buffer has wounded back.
316 * If yes it will have to be transferred in two separate dma
319 if (start + up->uart_dma.tx_buf_size >=
320 up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE)
321 up->uart_dma.tx_buf_size =
322 (up->uart_dma.tx_buf_dma_phys +
323 UART_XMIT_SIZE) - start;
325 omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0,
326 OMAP_DMA_AMODE_CONSTANT,
327 up->uart_dma.uart_base, 0, 0);
328 omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0,
329 OMAP_DMA_AMODE_POST_INC, start, 0, 0);
330 omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel,
331 OMAP_DMA_DATA_TYPE_S8,
332 up->uart_dma.tx_buf_size, 1,
333 OMAP_DMA_SYNC_ELEMENT,
334 up->uart_dma.uart_dma_tx, 0);
335 /* FIXME: Cache maintenance needed here? */
336 omap_start_dma(up->uart_dma.tx_dma_channel);
339 static unsigned int check_modem_status(struct uart_omap_port *up)
343 status = serial_in(up, UART_MSR);
344 status |= up->msr_saved_flags;
345 up->msr_saved_flags = 0;
346 if ((status & UART_MSR_ANY_DELTA) == 0)
349 if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
350 up->port.state != NULL) {
351 if (status & UART_MSR_TERI)
352 up->port.icount.rng++;
353 if (status & UART_MSR_DDSR)
354 up->port.icount.dsr++;
355 if (status & UART_MSR_DDCD)
356 uart_handle_dcd_change
357 (&up->port, status & UART_MSR_DCD);
358 if (status & UART_MSR_DCTS)
359 uart_handle_cts_change
360 (&up->port, status & UART_MSR_CTS);
361 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
368 * serial_omap_irq() - This handles the interrupt from one port
369 * @irq: uart port irq number
370 * @dev_id: uart port info
372 static inline irqreturn_t serial_omap_irq(int irq, void *dev_id)
374 struct uart_omap_port *up = dev_id;
375 unsigned int iir, lsr;
378 pm_runtime_get_sync(&up->pdev->dev);
379 iir = serial_in(up, UART_IIR);
380 if (iir & UART_IIR_NO_INT) {
381 pm_runtime_mark_last_busy(&up->pdev->dev);
382 pm_runtime_put_autosuspend(&up->pdev->dev);
386 spin_lock_irqsave(&up->port.lock, flags);
387 lsr = serial_in(up, UART_LSR);
388 if (iir & UART_IIR_RLSI) {
390 if (lsr & UART_LSR_DR)
391 receive_chars(up, &lsr);
393 up->ier &= ~(UART_IER_RDI | UART_IER_RLSI);
394 serial_out(up, UART_IER, up->ier);
395 if ((serial_omap_start_rxdma(up) != 0) &&
397 receive_chars(up, &lsr);
401 check_modem_status(up);
402 if ((lsr & UART_LSR_THRE) && (iir & UART_IIR_THRI))
405 spin_unlock_irqrestore(&up->port.lock, flags);
406 pm_runtime_mark_last_busy(&up->pdev->dev);
407 pm_runtime_put_autosuspend(&up->pdev->dev);
409 up->port_activity = jiffies;
413 static unsigned int serial_omap_tx_empty(struct uart_port *port)
415 struct uart_omap_port *up = (struct uart_omap_port *)port;
416 unsigned long flags = 0;
417 unsigned int ret = 0;
419 pm_runtime_get_sync(&up->pdev->dev);
420 dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->pdev->id);
421 spin_lock_irqsave(&up->port.lock, flags);
422 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
423 spin_unlock_irqrestore(&up->port.lock, flags);
424 pm_runtime_put(&up->pdev->dev);
428 static unsigned int serial_omap_get_mctrl(struct uart_port *port)
430 struct uart_omap_port *up = (struct uart_omap_port *)port;
431 unsigned char status;
432 unsigned int ret = 0;
434 pm_runtime_get_sync(&up->pdev->dev);
435 status = check_modem_status(up);
436 pm_runtime_put(&up->pdev->dev);
438 dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->pdev->id);
440 if (status & UART_MSR_DCD)
442 if (status & UART_MSR_RI)
444 if (status & UART_MSR_DSR)
446 if (status & UART_MSR_CTS)
451 static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
453 struct uart_omap_port *up = (struct uart_omap_port *)port;
454 unsigned char mcr = 0;
456 dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->pdev->id);
457 if (mctrl & TIOCM_RTS)
459 if (mctrl & TIOCM_DTR)
461 if (mctrl & TIOCM_OUT1)
462 mcr |= UART_MCR_OUT1;
463 if (mctrl & TIOCM_OUT2)
464 mcr |= UART_MCR_OUT2;
465 if (mctrl & TIOCM_LOOP)
466 mcr |= UART_MCR_LOOP;
468 pm_runtime_get_sync(&up->pdev->dev);
469 up->mcr = serial_in(up, UART_MCR);
471 serial_out(up, UART_MCR, up->mcr);
472 pm_runtime_put(&up->pdev->dev);
475 static void serial_omap_break_ctl(struct uart_port *port, int break_state)
477 struct uart_omap_port *up = (struct uart_omap_port *)port;
478 unsigned long flags = 0;
480 dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->pdev->id);
481 pm_runtime_get_sync(&up->pdev->dev);
482 spin_lock_irqsave(&up->port.lock, flags);
483 if (break_state == -1)
484 up->lcr |= UART_LCR_SBC;
486 up->lcr &= ~UART_LCR_SBC;
487 serial_out(up, UART_LCR, up->lcr);
488 spin_unlock_irqrestore(&up->port.lock, flags);
489 pm_runtime_put(&up->pdev->dev);
492 static int serial_omap_startup(struct uart_port *port)
494 struct uart_omap_port *up = (struct uart_omap_port *)port;
495 unsigned long flags = 0;
501 retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags,
506 dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->pdev->id);
508 pm_runtime_get_sync(&up->pdev->dev);
510 * Clear the FIFO buffers and disable them.
511 * (they will be reenabled in set_termios())
513 serial_omap_clear_fifos(up);
514 /* For Hardware flow control */
515 serial_out(up, UART_MCR, UART_MCR_RTS);
518 * Clear the interrupt registers.
520 (void) serial_in(up, UART_LSR);
521 if (serial_in(up, UART_LSR) & UART_LSR_DR)
522 (void) serial_in(up, UART_RX);
523 (void) serial_in(up, UART_IIR);
524 (void) serial_in(up, UART_MSR);
527 * Now, initialize the UART
529 serial_out(up, UART_LCR, UART_LCR_WLEN8);
530 spin_lock_irqsave(&up->port.lock, flags);
532 * Most PC uarts need OUT2 raised to enable interrupts.
534 up->port.mctrl |= TIOCM_OUT2;
535 serial_omap_set_mctrl(&up->port, up->port.mctrl);
536 spin_unlock_irqrestore(&up->port.lock, flags);
538 up->msr_saved_flags = 0;
540 free_page((unsigned long)up->port.state->xmit.buf);
541 up->port.state->xmit.buf = dma_alloc_coherent(NULL,
543 (dma_addr_t *)&(up->uart_dma.tx_buf_dma_phys),
545 init_timer(&(up->uart_dma.rx_timer));
546 up->uart_dma.rx_timer.function = serial_omap_rx_timeout;
547 up->uart_dma.rx_timer.data = up->pdev->id;
548 /* Currently the buffer size is 4KB. Can increase it */
549 up->uart_dma.rx_buf = dma_alloc_coherent(NULL,
550 up->uart_dma.rx_buf_size,
551 (dma_addr_t *)&(up->uart_dma.rx_buf_dma_phys), 0);
554 * Finally, enable interrupts. Note: Modem status interrupts
555 * are set via set_termios(), which will be occurring imminently
556 * anyway, so we don't enable them here.
558 up->ier = UART_IER_RLSI | UART_IER_RDI;
559 serial_out(up, UART_IER, up->ier);
561 /* Enable module level wake up */
562 serial_out(up, UART_OMAP_WER, OMAP_UART_WER_MOD_WKUP);
564 pm_runtime_mark_last_busy(&up->pdev->dev);
565 pm_runtime_put_autosuspend(&up->pdev->dev);
566 up->port_activity = jiffies;
570 static void serial_omap_shutdown(struct uart_port *port)
572 struct uart_omap_port *up = (struct uart_omap_port *)port;
573 unsigned long flags = 0;
575 dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->pdev->id);
577 pm_runtime_get_sync(&up->pdev->dev);
579 * Disable interrupts from this port
582 serial_out(up, UART_IER, 0);
584 spin_lock_irqsave(&up->port.lock, flags);
585 up->port.mctrl &= ~TIOCM_OUT2;
586 serial_omap_set_mctrl(&up->port, up->port.mctrl);
587 spin_unlock_irqrestore(&up->port.lock, flags);
590 * Disable break condition and FIFOs
592 serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
593 serial_omap_clear_fifos(up);
596 * Read data port to reset things, and then free the irq
598 if (serial_in(up, UART_LSR) & UART_LSR_DR)
599 (void) serial_in(up, UART_RX);
601 dma_free_coherent(up->port.dev,
602 UART_XMIT_SIZE, up->port.state->xmit.buf,
603 up->uart_dma.tx_buf_dma_phys);
604 up->port.state->xmit.buf = NULL;
605 serial_omap_stop_rx(port);
606 dma_free_coherent(up->port.dev,
607 up->uart_dma.rx_buf_size, up->uart_dma.rx_buf,
608 up->uart_dma.rx_buf_dma_phys);
609 up->uart_dma.rx_buf = NULL;
612 pm_runtime_put(&up->pdev->dev);
613 free_irq(up->port.irq, up);
617 serial_omap_configure_xonxoff
618 (struct uart_omap_port *up, struct ktermios *termios)
620 up->lcr = serial_in(up, UART_LCR);
621 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
622 up->efr = serial_in(up, UART_EFR);
623 serial_out(up, UART_EFR, up->efr & ~UART_EFR_ECB);
625 serial_out(up, UART_XON1, termios->c_cc[VSTART]);
626 serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]);
628 /* clear SW control mode bits */
629 up->efr &= OMAP_UART_SW_CLR;
633 * Enable XON/XOFF flow control on output.
634 * Transmit XON1, XOFF1
636 if (termios->c_iflag & IXON)
637 up->efr |= OMAP_UART_SW_TX;
641 * Enable XON/XOFF flow control on input.
642 * Receiver compares XON1, XOFF1.
644 if (termios->c_iflag & IXOFF)
645 up->efr |= OMAP_UART_SW_RX;
647 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
648 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
650 up->mcr = serial_in(up, UART_MCR);
654 * Enable any character to restart output.
655 * Operation resumes after receiving any
656 * character after recognition of the XOFF character
658 if (termios->c_iflag & IXANY)
659 up->mcr |= UART_MCR_XONANY;
661 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
662 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
663 serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
664 /* Enable special char function UARTi.EFR_REG[5] and
665 * load the new software flow control mode IXON or IXOFF
666 * and restore the UARTi.EFR_REG[4] ENHANCED_EN value.
668 serial_out(up, UART_EFR, up->efr | UART_EFR_SCD);
669 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
671 serial_out(up, UART_MCR, up->mcr & ~UART_MCR_TCRTLR);
672 serial_out(up, UART_LCR, up->lcr);
676 serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
677 struct ktermios *old)
679 struct uart_omap_port *up = (struct uart_omap_port *)port;
680 unsigned char cval = 0;
681 unsigned char efr = 0;
682 unsigned long flags = 0;
683 unsigned int baud, quot;
685 switch (termios->c_cflag & CSIZE) {
687 cval = UART_LCR_WLEN5;
690 cval = UART_LCR_WLEN6;
693 cval = UART_LCR_WLEN7;
697 cval = UART_LCR_WLEN8;
701 if (termios->c_cflag & CSTOPB)
702 cval |= UART_LCR_STOP;
703 if (termios->c_cflag & PARENB)
704 cval |= UART_LCR_PARITY;
705 if (!(termios->c_cflag & PARODD))
706 cval |= UART_LCR_EPAR;
709 * Ask the core to calculate the divisor for us.
712 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13);
713 quot = serial_omap_get_divisor(port, baud);
715 up->dll = quot & 0xff;
717 up->mdr1 = UART_OMAP_MDR1_DISABLE;
719 up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 |
720 UART_FCR_ENABLE_FIFO;
722 up->fcr |= UART_FCR_DMA_SELECT;
725 * Ok, we're now changing the port state. Do it with
726 * interrupts disabled.
728 pm_runtime_get_sync(&up->pdev->dev);
729 spin_lock_irqsave(&up->port.lock, flags);
732 * Update the per-port timeout.
734 uart_update_timeout(port, termios->c_cflag, baud);
736 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
737 if (termios->c_iflag & INPCK)
738 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
739 if (termios->c_iflag & (BRKINT | PARMRK))
740 up->port.read_status_mask |= UART_LSR_BI;
743 * Characters to ignore
745 up->port.ignore_status_mask = 0;
746 if (termios->c_iflag & IGNPAR)
747 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
748 if (termios->c_iflag & IGNBRK) {
749 up->port.ignore_status_mask |= UART_LSR_BI;
751 * If we're ignoring parity and break indicators,
752 * ignore overruns too (for real raw support).
754 if (termios->c_iflag & IGNPAR)
755 up->port.ignore_status_mask |= UART_LSR_OE;
759 * ignore all characters if CREAD is not set
761 if ((termios->c_cflag & CREAD) == 0)
762 up->port.ignore_status_mask |= UART_LSR_DR;
765 * Modem status interrupts
767 up->ier &= ~UART_IER_MSI;
768 if (UART_ENABLE_MS(&up->port, termios->c_cflag))
769 up->ier |= UART_IER_MSI;
770 serial_out(up, UART_IER, up->ier);
771 serial_out(up, UART_LCR, cval); /* reset DLAB */
774 /* FIFOs and DMA Settings */
776 /* FCR can be changed only when the
777 * baud clock is not running
778 * DLL_REG and DLH_REG set to 0.
780 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
781 serial_out(up, UART_DLL, 0);
782 serial_out(up, UART_DLM, 0);
783 serial_out(up, UART_LCR, 0);
785 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
787 up->efr = serial_in(up, UART_EFR);
788 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
790 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
791 up->mcr = serial_in(up, UART_MCR);
792 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
793 /* FIFO ENABLE, DMA MODE */
794 serial_out(up, UART_FCR, up->fcr);
795 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
798 serial_out(up, UART_TI752_TLR, 0);
799 up->scr |= (UART_FCR_TRIGGER_4 | UART_FCR_TRIGGER_8);
802 serial_out(up, UART_OMAP_SCR, up->scr);
804 serial_out(up, UART_EFR, up->efr);
805 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
806 serial_out(up, UART_MCR, up->mcr);
808 /* Protocol, Baud Rate, and Interrupt Settings */
810 serial_out(up, UART_OMAP_MDR1, up->mdr1);
811 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
813 up->efr = serial_in(up, UART_EFR);
814 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
816 serial_out(up, UART_LCR, 0);
817 serial_out(up, UART_IER, 0);
818 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
820 serial_out(up, UART_DLL, up->dll); /* LS of divisor */
821 serial_out(up, UART_DLM, up->dlh); /* MS of divisor */
823 serial_out(up, UART_LCR, 0);
824 serial_out(up, UART_IER, up->ier);
825 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
827 serial_out(up, UART_EFR, up->efr);
828 serial_out(up, UART_LCR, cval);
830 if (baud > 230400 && baud != 3000000)
831 up->mdr1 = UART_OMAP_MDR1_13X_MODE;
833 up->mdr1 = UART_OMAP_MDR1_16X_MODE;
835 serial_out(up, UART_OMAP_MDR1, up->mdr1);
837 /* Hardware Flow Control Configuration */
839 if (termios->c_cflag & CRTSCTS) {
840 efr |= (UART_EFR_CTS | UART_EFR_RTS);
841 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
843 up->mcr = serial_in(up, UART_MCR);
844 serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
846 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
847 up->efr = serial_in(up, UART_EFR);
848 serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
850 serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
851 serial_out(up, UART_EFR, efr); /* Enable AUTORTS and AUTOCTS */
852 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
853 serial_out(up, UART_MCR, up->mcr | UART_MCR_RTS);
854 serial_out(up, UART_LCR, cval);
857 serial_omap_set_mctrl(&up->port, up->port.mctrl);
858 /* Software Flow Control Configuration */
859 serial_omap_configure_xonxoff(up, termios);
861 spin_unlock_irqrestore(&up->port.lock, flags);
862 pm_runtime_put(&up->pdev->dev);
863 dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->pdev->id);
867 serial_omap_pm(struct uart_port *port, unsigned int state,
868 unsigned int oldstate)
870 struct uart_omap_port *up = (struct uart_omap_port *)port;
873 dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->pdev->id);
875 pm_runtime_get_sync(&up->pdev->dev);
876 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
877 efr = serial_in(up, UART_EFR);
878 serial_out(up, UART_EFR, efr | UART_EFR_ECB);
879 serial_out(up, UART_LCR, 0);
881 serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0);
882 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
883 serial_out(up, UART_EFR, efr);
884 serial_out(up, UART_LCR, 0);
886 if (!device_may_wakeup(&up->pdev->dev)) {
888 pm_runtime_forbid(&up->pdev->dev);
890 pm_runtime_allow(&up->pdev->dev);
893 pm_runtime_put(&up->pdev->dev);
896 static void serial_omap_release_port(struct uart_port *port)
898 dev_dbg(port->dev, "serial_omap_release_port+\n");
901 static int serial_omap_request_port(struct uart_port *port)
903 dev_dbg(port->dev, "serial_omap_request_port+\n");
907 static void serial_omap_config_port(struct uart_port *port, int flags)
909 struct uart_omap_port *up = (struct uart_omap_port *)port;
911 dev_dbg(up->port.dev, "serial_omap_config_port+%d\n",
913 up->port.type = PORT_OMAP;
917 serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser)
919 /* we don't want the core code to modify any port params */
920 dev_dbg(port->dev, "serial_omap_verify_port+\n");
925 serial_omap_type(struct uart_port *port)
927 struct uart_omap_port *up = (struct uart_omap_port *)port;
929 dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->pdev->id);
933 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
935 static inline void wait_for_xmitr(struct uart_omap_port *up)
937 unsigned int status, tmout = 10000;
939 /* Wait up to 10ms for the character(s) to be sent. */
941 status = serial_in(up, UART_LSR);
943 if (status & UART_LSR_BI)
944 up->lsr_break_flag = UART_LSR_BI;
949 } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
951 /* Wait up to 1s for flow control if necessary */
952 if (up->port.flags & UPF_CONS_FLOW) {
954 for (tmout = 1000000; tmout; tmout--) {
955 unsigned int msr = serial_in(up, UART_MSR);
957 up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
958 if (msr & UART_MSR_CTS)
966 #ifdef CONFIG_CONSOLE_POLL
968 static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch)
970 struct uart_omap_port *up = (struct uart_omap_port *)port;
972 pm_runtime_get_sync(&up->pdev->dev);
974 serial_out(up, UART_TX, ch);
975 pm_runtime_put(&up->pdev->dev);
978 static int serial_omap_poll_get_char(struct uart_port *port)
980 struct uart_omap_port *up = (struct uart_omap_port *)port;
983 pm_runtime_get_sync(&up->pdev->dev);
984 status = serial_in(up, UART_LSR);
985 if (!(status & UART_LSR_DR))
988 status = serial_in(up, UART_RX);
989 pm_runtime_put(&up->pdev->dev);
993 #endif /* CONFIG_CONSOLE_POLL */
995 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
997 static struct uart_omap_port *serial_omap_console_ports[4];
999 static struct uart_driver serial_omap_reg;
1001 static void serial_omap_console_putchar(struct uart_port *port, int ch)
1003 struct uart_omap_port *up = (struct uart_omap_port *)port;
1006 serial_out(up, UART_TX, ch);
1010 serial_omap_console_write(struct console *co, const char *s,
1013 struct uart_omap_port *up = serial_omap_console_ports[co->index];
1014 unsigned long flags;
1018 pm_runtime_get_sync(&up->pdev->dev);
1020 local_irq_save(flags);
1023 else if (oops_in_progress)
1024 locked = spin_trylock(&up->port.lock);
1026 spin_lock(&up->port.lock);
1029 * First save the IER then disable the interrupts
1031 ier = serial_in(up, UART_IER);
1032 serial_out(up, UART_IER, 0);
1034 uart_console_write(&up->port, s, count, serial_omap_console_putchar);
1037 * Finally, wait for transmitter to become empty
1038 * and restore the IER
1041 serial_out(up, UART_IER, ier);
1043 * The receive handling will happen properly because the
1044 * receive ready bit will still be set; it is not cleared
1045 * on read. However, modem control will not, we must
1046 * call it if we have saved something in the saved flags
1047 * while processing with interrupts off.
1049 if (up->msr_saved_flags)
1050 check_modem_status(up);
1052 pm_runtime_mark_last_busy(&up->pdev->dev);
1053 pm_runtime_put_autosuspend(&up->pdev->dev);
1055 spin_unlock(&up->port.lock);
1056 local_irq_restore(flags);
1060 serial_omap_console_setup(struct console *co, char *options)
1062 struct uart_omap_port *up;
1068 if (serial_omap_console_ports[co->index] == NULL)
1070 up = serial_omap_console_ports[co->index];
1073 uart_parse_options(options, &baud, &parity, &bits, &flow);
1075 return uart_set_options(&up->port, co, baud, parity, bits, flow);
1078 static struct console serial_omap_console = {
1079 .name = OMAP_SERIAL_NAME,
1080 .write = serial_omap_console_write,
1081 .device = uart_console_device,
1082 .setup = serial_omap_console_setup,
1083 .flags = CON_PRINTBUFFER,
1085 .data = &serial_omap_reg,
1088 static void serial_omap_add_console_port(struct uart_omap_port *up)
1090 serial_omap_console_ports[up->pdev->id] = up;
1093 #define OMAP_CONSOLE (&serial_omap_console)
1097 #define OMAP_CONSOLE NULL
1099 static inline void serial_omap_add_console_port(struct uart_omap_port *up)
1104 static struct uart_ops serial_omap_pops = {
1105 .tx_empty = serial_omap_tx_empty,
1106 .set_mctrl = serial_omap_set_mctrl,
1107 .get_mctrl = serial_omap_get_mctrl,
1108 .stop_tx = serial_omap_stop_tx,
1109 .start_tx = serial_omap_start_tx,
1110 .stop_rx = serial_omap_stop_rx,
1111 .enable_ms = serial_omap_enable_ms,
1112 .break_ctl = serial_omap_break_ctl,
1113 .startup = serial_omap_startup,
1114 .shutdown = serial_omap_shutdown,
1115 .set_termios = serial_omap_set_termios,
1116 .pm = serial_omap_pm,
1117 .type = serial_omap_type,
1118 .release_port = serial_omap_release_port,
1119 .request_port = serial_omap_request_port,
1120 .config_port = serial_omap_config_port,
1121 .verify_port = serial_omap_verify_port,
1122 #ifdef CONFIG_CONSOLE_POLL
1123 .poll_put_char = serial_omap_poll_put_char,
1124 .poll_get_char = serial_omap_poll_get_char,
1128 static struct uart_driver serial_omap_reg = {
1129 .owner = THIS_MODULE,
1130 .driver_name = "OMAP-SERIAL",
1131 .dev_name = OMAP_SERIAL_NAME,
1132 .nr = OMAP_MAX_HSUART_PORTS,
1133 .cons = OMAP_CONSOLE,
1136 #ifdef CONFIG_SUSPEND
1137 static int serial_omap_suspend(struct device *dev)
1139 struct uart_omap_port *up = dev_get_drvdata(dev);
1142 uart_suspend_port(&serial_omap_reg, &up->port);
1146 static int serial_omap_resume(struct device *dev)
1148 struct uart_omap_port *up = dev_get_drvdata(dev);
1151 uart_resume_port(&serial_omap_reg, &up->port);
1156 static void serial_omap_rx_timeout(unsigned long uart_no)
1158 struct uart_omap_port *up = ui[uart_no];
1159 unsigned int curr_dma_pos, curr_transmitted_size;
1162 curr_dma_pos = omap_get_dma_dst_pos(up->uart_dma.rx_dma_channel);
1163 if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) ||
1164 (curr_dma_pos == 0)) {
1165 if (jiffies_to_msecs(jiffies - up->port_activity) <
1167 mod_timer(&up->uart_dma.rx_timer, jiffies +
1168 usecs_to_jiffies(up->uart_dma.rx_timeout));
1170 serial_omap_stop_rxdma(up);
1171 up->ier |= (UART_IER_RDI | UART_IER_RLSI);
1172 serial_out(up, UART_IER, up->ier);
1177 curr_transmitted_size = curr_dma_pos -
1178 up->uart_dma.prev_rx_dma_pos;
1179 up->port.icount.rx += curr_transmitted_size;
1180 tty_insert_flip_string(up->port.state->port.tty,
1181 up->uart_dma.rx_buf +
1182 (up->uart_dma.prev_rx_dma_pos -
1183 up->uart_dma.rx_buf_dma_phys),
1184 curr_transmitted_size);
1185 tty_flip_buffer_push(up->port.state->port.tty);
1186 up->uart_dma.prev_rx_dma_pos = curr_dma_pos;
1187 if (up->uart_dma.rx_buf_size +
1188 up->uart_dma.rx_buf_dma_phys == curr_dma_pos) {
1189 ret = serial_omap_start_rxdma(up);
1191 serial_omap_stop_rxdma(up);
1192 up->ier |= (UART_IER_RDI | UART_IER_RLSI);
1193 serial_out(up, UART_IER, up->ier);
1196 mod_timer(&up->uart_dma.rx_timer, jiffies +
1197 usecs_to_jiffies(up->uart_dma.rx_timeout));
1199 up->port_activity = jiffies;
1202 static void uart_rx_dma_callback(int lch, u16 ch_status, void *data)
1207 static int serial_omap_start_rxdma(struct uart_omap_port *up)
1211 if (up->uart_dma.rx_dma_channel == -1) {
1212 pm_runtime_get_sync(&up->pdev->dev);
1213 ret = omap_request_dma(up->uart_dma.uart_dma_rx,
1215 (void *)uart_rx_dma_callback, up,
1216 &(up->uart_dma.rx_dma_channel));
1220 omap_set_dma_src_params(up->uart_dma.rx_dma_channel, 0,
1221 OMAP_DMA_AMODE_CONSTANT,
1222 up->uart_dma.uart_base, 0, 0);
1223 omap_set_dma_dest_params(up->uart_dma.rx_dma_channel, 0,
1224 OMAP_DMA_AMODE_POST_INC,
1225 up->uart_dma.rx_buf_dma_phys, 0, 0);
1226 omap_set_dma_transfer_params(up->uart_dma.rx_dma_channel,
1227 OMAP_DMA_DATA_TYPE_S8,
1228 up->uart_dma.rx_buf_size, 1,
1229 OMAP_DMA_SYNC_ELEMENT,
1230 up->uart_dma.uart_dma_rx, 0);
1232 up->uart_dma.prev_rx_dma_pos = up->uart_dma.rx_buf_dma_phys;
1233 /* FIXME: Cache maintenance needed here? */
1234 omap_start_dma(up->uart_dma.rx_dma_channel);
1235 mod_timer(&up->uart_dma.rx_timer, jiffies +
1236 usecs_to_jiffies(up->uart_dma.rx_timeout));
1237 up->uart_dma.rx_dma_used = true;
1241 static void serial_omap_continue_tx(struct uart_omap_port *up)
1243 struct circ_buf *xmit = &up->port.state->xmit;
1244 unsigned int start = up->uart_dma.tx_buf_dma_phys
1245 + (xmit->tail & (UART_XMIT_SIZE - 1));
1247 if (uart_circ_empty(xmit))
1250 up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit);
1252 * It is a circular buffer. See if the buffer has wounded back.
1253 * If yes it will have to be transferred in two separate dma
1256 if (start + up->uart_dma.tx_buf_size >=
1257 up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE)
1258 up->uart_dma.tx_buf_size =
1259 (up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) - start;
1260 omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0,
1261 OMAP_DMA_AMODE_CONSTANT,
1262 up->uart_dma.uart_base, 0, 0);
1263 omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0,
1264 OMAP_DMA_AMODE_POST_INC, start, 0, 0);
1265 omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel,
1266 OMAP_DMA_DATA_TYPE_S8,
1267 up->uart_dma.tx_buf_size, 1,
1268 OMAP_DMA_SYNC_ELEMENT,
1269 up->uart_dma.uart_dma_tx, 0);
1270 /* FIXME: Cache maintenance needed here? */
1271 omap_start_dma(up->uart_dma.tx_dma_channel);
1274 static void uart_tx_dma_callback(int lch, u16 ch_status, void *data)
1276 struct uart_omap_port *up = (struct uart_omap_port *)data;
1277 struct circ_buf *xmit = &up->port.state->xmit;
1279 xmit->tail = (xmit->tail + up->uart_dma.tx_buf_size) & \
1280 (UART_XMIT_SIZE - 1);
1281 up->port.icount.tx += up->uart_dma.tx_buf_size;
1283 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
1284 uart_write_wakeup(&up->port);
1286 if (uart_circ_empty(xmit)) {
1287 spin_lock(&(up->uart_dma.tx_lock));
1288 serial_omap_stop_tx(&up->port);
1289 up->uart_dma.tx_dma_used = false;
1290 spin_unlock(&(up->uart_dma.tx_lock));
1292 omap_stop_dma(up->uart_dma.tx_dma_channel);
1293 serial_omap_continue_tx(up);
1295 up->port_activity = jiffies;
1299 static int serial_omap_probe(struct platform_device *pdev)
1301 struct uart_omap_port *up;
1302 struct resource *mem, *irq, *dma_tx, *dma_rx;
1303 struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data;
1306 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1308 dev_err(&pdev->dev, "no mem resource?\n");
1312 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1314 dev_err(&pdev->dev, "no irq resource?\n");
1318 if (!request_mem_region(mem->start, resource_size(mem),
1319 pdev->dev.driver->name)) {
1320 dev_err(&pdev->dev, "memory region already claimed\n");
1324 dma_rx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
1330 dma_tx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
1336 up = kzalloc(sizeof(*up), GFP_KERNEL);
1339 goto do_release_region;
1341 sprintf(up->name, "OMAP UART%d", pdev->id);
1343 up->port.dev = &pdev->dev;
1344 up->port.type = PORT_OMAP;
1345 up->port.iotype = UPIO_MEM;
1346 up->port.irq = irq->start;
1348 up->port.regshift = 2;
1349 up->port.fifosize = 64;
1350 up->port.ops = &serial_omap_pops;
1351 up->port.line = pdev->id;
1353 up->port.mapbase = mem->start;
1354 up->port.membase = ioremap(mem->start, resource_size(mem));
1355 if (!up->port.membase) {
1356 dev_err(&pdev->dev, "can't ioremap UART\n");
1361 up->port.flags = omap_up_info->flags;
1362 up->port.uartclk = omap_up_info->uartclk;
1363 up->uart_dma.uart_base = mem->start;
1365 if (omap_up_info->dma_enabled) {
1366 up->uart_dma.uart_dma_tx = dma_tx->start;
1367 up->uart_dma.uart_dma_rx = dma_rx->start;
1369 up->uart_dma.rx_buf_size = 4096;
1370 up->uart_dma.rx_timeout = 2;
1371 spin_lock_init(&(up->uart_dma.tx_lock));
1372 spin_lock_init(&(up->uart_dma.rx_lock));
1373 up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE;
1374 up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE;
1377 pm_runtime_use_autosuspend(&pdev->dev);
1378 pm_runtime_set_autosuspend_delay(&pdev->dev,
1379 OMAP_UART_AUTOSUSPEND_DELAY);
1381 pm_runtime_irq_safe(&pdev->dev);
1382 pm_runtime_enable(&pdev->dev);
1383 pm_runtime_get_sync(&pdev->dev);
1386 serial_omap_add_console_port(up);
1388 ret = uart_add_one_port(&serial_omap_reg, &up->port);
1390 goto do_release_region;
1392 pm_runtime_put(&pdev->dev);
1393 platform_set_drvdata(pdev, up);
1396 dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n",
1397 pdev->id, __func__, ret);
1399 release_mem_region(mem->start, resource_size(mem));
1403 static int serial_omap_remove(struct platform_device *dev)
1405 struct uart_omap_port *up = platform_get_drvdata(dev);
1408 pm_runtime_disable(&up->pdev->dev);
1409 uart_remove_one_port(&serial_omap_reg, &up->port);
1413 platform_set_drvdata(dev, NULL);
1417 static void serial_omap_restore_context(struct uart_omap_port *up)
1419 serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE);
1420 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1421 serial_out(up, UART_EFR, UART_EFR_ECB);
1422 serial_out(up, UART_LCR, 0x0); /* Operational mode */
1423 serial_out(up, UART_IER, 0x0);
1424 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1425 serial_out(up, UART_DLL, up->dll);
1426 serial_out(up, UART_DLM, up->dlh);
1427 serial_out(up, UART_LCR, 0x0); /* Operational mode */
1428 serial_out(up, UART_IER, up->ier);
1429 serial_out(up, UART_FCR, up->fcr);
1430 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
1431 serial_out(up, UART_MCR, up->mcr);
1432 serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); /* Config B mode */
1433 serial_out(up, UART_OMAP_SCR, up->scr);
1434 serial_out(up, UART_EFR, up->efr);
1435 serial_out(up, UART_LCR, up->lcr);
1436 serial_out(up, UART_OMAP_MDR1, up->mdr1);
1439 #ifdef CONFIG_PM_RUNTIME
1440 static int serial_omap_runtime_suspend(struct device *dev)
1445 static int serial_omap_runtime_resume(struct device *dev)
1447 struct uart_omap_port *up = dev_get_drvdata(dev);
1450 serial_omap_restore_context(up);
1456 static const struct dev_pm_ops serial_omap_dev_pm_ops = {
1457 SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume)
1458 SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend,
1459 serial_omap_runtime_resume, NULL)
1462 static struct platform_driver serial_omap_driver = {
1463 .probe = serial_omap_probe,
1464 .remove = serial_omap_remove,
1466 .name = DRIVER_NAME,
1467 .pm = &serial_omap_dev_pm_ops,
1471 static int __init serial_omap_init(void)
1475 ret = uart_register_driver(&serial_omap_reg);
1478 ret = platform_driver_register(&serial_omap_driver);
1480 uart_unregister_driver(&serial_omap_reg);
1484 static void __exit serial_omap_exit(void)
1486 platform_driver_unregister(&serial_omap_driver);
1487 uart_unregister_driver(&serial_omap_reg);
1490 module_init(serial_omap_init);
1491 module_exit(serial_omap_exit);
1493 MODULE_DESCRIPTION("OMAP High Speed UART driver");
1494 MODULE_LICENSE("GPL");
1495 MODULE_AUTHOR("Texas Instruments Inc");