2 * linux/drivers/serial/imx.c
4 * Driver for Motorola IMX serial ports
6 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
8 * Author: Sascha Hauer <sascha@saschahauer.de>
9 * Copyright (C) 2004 Pengutronix
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 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 * [29-Mar-2005] Mike Lee
26 * Added hardware handshake
28 #include <linux/config.h>
30 #if defined(CONFIG_SERIAL_IMX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
34 #include <linux/module.h>
35 #include <linux/ioport.h>
36 #include <linux/init.h>
37 #include <linux/console.h>
38 #include <linux/sysrq.h>
39 #include <linux/platform_device.h>
40 #include <linux/tty.h>
41 #include <linux/tty_flip.h>
42 #include <linux/serial_core.h>
43 #include <linux/serial.h>
47 #include <asm/hardware.h>
48 #include <asm/arch/imx-uart.h>
50 /* We've been assigned a range on the "Low-density serial ports" major */
51 #define SERIAL_IMX_MAJOR 204
52 #define MINOR_START 41
56 #define IMX_ISR_PASS_LIMIT 256
59 * This is the size of our serial port register set.
61 #define UART_PORT_SIZE 0x100
64 * This determines how often we check the modem status signals
65 * for any change. They generally aren't connected to an IRQ
66 * so we have to poll them. We also check immediately before
67 * filling the TX fifo incase CTS has been dropped.
69 #define MCTRL_TIMEOUT (250*HZ/1000)
71 #define DRIVER_NAME "IMX-uart"
74 struct uart_port port;
75 struct timer_list timer;
76 unsigned int old_status;
77 int txirq,rxirq,rtsirq;
82 * Handle any change of modem status signal since we were last called.
84 static void imx_mctrl_check(struct imx_port *sport)
86 unsigned int status, changed;
88 status = sport->port.ops->get_mctrl(&sport->port);
89 changed = status ^ sport->old_status;
94 sport->old_status = status;
96 if (changed & TIOCM_RI)
97 sport->port.icount.rng++;
98 if (changed & TIOCM_DSR)
99 sport->port.icount.dsr++;
100 if (changed & TIOCM_CAR)
101 uart_handle_dcd_change(&sport->port, status & TIOCM_CAR);
102 if (changed & TIOCM_CTS)
103 uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
105 wake_up_interruptible(&sport->port.info->delta_msr_wait);
109 * This is our per-port timeout handler, for checking the
110 * modem status signals.
112 static void imx_timeout(unsigned long data)
114 struct imx_port *sport = (struct imx_port *)data;
117 if (sport->port.info) {
118 spin_lock_irqsave(&sport->port.lock, flags);
119 imx_mctrl_check(sport);
120 spin_unlock_irqrestore(&sport->port.lock, flags);
122 mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
127 * interrupts disabled on entry
129 static void imx_stop_tx(struct uart_port *port)
131 struct imx_port *sport = (struct imx_port *)port;
132 UCR1((u32)sport->port.membase) &= ~UCR1_TXMPTYEN;
136 * interrupts disabled on entry
138 static void imx_stop_rx(struct uart_port *port)
140 struct imx_port *sport = (struct imx_port *)port;
141 UCR2((u32)sport->port.membase) &= ~UCR2_RXEN;
145 * Set the modem control timer to fire immediately.
147 static void imx_enable_ms(struct uart_port *port)
149 struct imx_port *sport = (struct imx_port *)port;
151 mod_timer(&sport->timer, jiffies);
154 static inline void imx_transmit_buffer(struct imx_port *sport)
156 struct circ_buf *xmit = &sport->port.info->xmit;
159 /* send xmit->buf[xmit->tail]
160 * out the port here */
161 URTX0((u32)sport->port.membase) = xmit->buf[xmit->tail];
162 xmit->tail = (xmit->tail + 1) &
163 (UART_XMIT_SIZE - 1);
164 sport->port.icount.tx++;
165 if (uart_circ_empty(xmit))
167 } while (!(UTS((u32)sport->port.membase) & UTS_TXFULL));
169 if (uart_circ_empty(xmit))
170 imx_stop_tx(&sport->port);
174 * interrupts disabled on entry
176 static void imx_start_tx(struct uart_port *port)
178 struct imx_port *sport = (struct imx_port *)port;
180 UCR1((u32)sport->port.membase) |= UCR1_TXMPTYEN;
182 if(UTS((u32)sport->port.membase) & UTS_TXEMPTY)
183 imx_transmit_buffer(sport);
186 static irqreturn_t imx_rtsint(int irq, void *dev_id, struct pt_regs *regs)
188 struct imx_port *sport = (struct imx_port *)dev_id;
189 unsigned int val = USR1((u32)sport->port.membase)&USR1_RTSS;
192 spin_lock_irqsave(&sport->port.lock, flags);
194 USR1((u32)sport->port.membase) = USR1_RTSD;
195 uart_handle_cts_change(&sport->port, !!val);
196 wake_up_interruptible(&sport->port.info->delta_msr_wait);
198 spin_unlock_irqrestore(&sport->port.lock, flags);
202 static irqreturn_t imx_txint(int irq, void *dev_id, struct pt_regs *regs)
204 struct imx_port *sport = (struct imx_port *)dev_id;
205 struct circ_buf *xmit = &sport->port.info->xmit;
208 spin_lock_irqsave(&sport->port.lock,flags);
209 if (sport->port.x_char)
212 URTX0((u32)sport->port.membase) = sport->port.x_char;
216 if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
217 imx_stop_tx(&sport->port);
221 imx_transmit_buffer(sport);
223 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
224 uart_write_wakeup(&sport->port);
227 spin_unlock_irqrestore(&sport->port.lock,flags);
231 static irqreturn_t imx_rxint(int irq, void *dev_id, struct pt_regs *regs)
233 struct imx_port *sport = dev_id;
234 unsigned int rx,flg,ignored = 0;
235 struct tty_struct *tty = sport->port.info->tty;
238 rx = URXD0((u32)sport->port.membase);
239 spin_lock_irqsave(&sport->port.lock,flags);
243 sport->port.icount.rx++;
245 if( USR2((u32)sport->port.membase) & USR2_BRCD ) {
246 USR2((u32)sport->port.membase) |= USR2_BRCD;
247 if(uart_handle_break(&sport->port))
251 if (uart_handle_sysrq_char
252 (&sport->port, (unsigned char)rx, regs))
255 if( rx & (URXD_PRERR | URXD_OVRRUN | URXD_FRMERR) )
259 tty_insert_flip_char(tty, rx, flg);
262 rx = URXD0((u32)sport->port.membase);
263 } while(rx & URXD_CHARRDY);
266 spin_unlock_irqrestore(&sport->port.lock,flags);
267 tty_flip_buffer_push(tty);
272 sport->port.icount.parity++;
273 else if (rx & URXD_FRMERR)
274 sport->port.icount.frame++;
275 if (rx & URXD_OVRRUN)
276 sport->port.icount.overrun++;
278 if (rx & sport->port.ignore_status_mask) {
284 rx &= sport->port.read_status_mask;
288 else if (rx & URXD_FRMERR)
290 if (rx & URXD_OVRRUN)
294 sport->port.sysrq = 0;
300 * Return TIOCSER_TEMT when transmitter is not busy.
302 static unsigned int imx_tx_empty(struct uart_port *port)
304 struct imx_port *sport = (struct imx_port *)port;
306 return USR2((u32)sport->port.membase) & USR2_TXDC ? TIOCSER_TEMT : 0;
310 * We have a modem side uart, so the meanings of RTS and CTS are inverted.
312 static unsigned int imx_get_mctrl(struct uart_port *port)
314 struct imx_port *sport = (struct imx_port *)port;
315 unsigned int tmp = TIOCM_DSR | TIOCM_CAR;
317 if (USR1((u32)sport->port.membase) & USR1_RTSS)
320 if (UCR2((u32)sport->port.membase) & UCR2_CTS)
326 static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl)
328 struct imx_port *sport = (struct imx_port *)port;
330 if (mctrl & TIOCM_RTS)
331 UCR2((u32)sport->port.membase) |= UCR2_CTS;
333 UCR2((u32)sport->port.membase) &= ~UCR2_CTS;
337 * Interrupts always disabled.
339 static void imx_break_ctl(struct uart_port *port, int break_state)
341 struct imx_port *sport = (struct imx_port *)port;
344 spin_lock_irqsave(&sport->port.lock, flags);
346 if ( break_state != 0 )
347 UCR1((u32)sport->port.membase) |= UCR1_SNDBRK;
349 UCR1((u32)sport->port.membase) &= ~UCR1_SNDBRK;
351 spin_unlock_irqrestore(&sport->port.lock, flags);
354 #define TXTL 2 /* reset default */
355 #define RXTL 1 /* reset default */
357 static int imx_setup_ufcr(struct imx_port *sport, unsigned int mode)
360 unsigned int ufcr_rfdiv;
362 /* set receiver / transmitter trigger level.
363 * RFDIV is set such way to satisfy requested uartclk value
365 val = TXTL<<10 | RXTL;
366 ufcr_rfdiv = (imx_get_perclk1() + sport->port.uartclk / 2) / sport->port.uartclk;
374 ufcr_rfdiv = 6 - ufcr_rfdiv;
376 val |= UFCR_RFDIV & (ufcr_rfdiv << 7);
378 UFCR((u32)sport->port.membase) = val;
383 static int imx_startup(struct uart_port *port)
385 struct imx_port *sport = (struct imx_port *)port;
389 imx_setup_ufcr(sport, 0);
391 /* disable the DREN bit (Data Ready interrupt enable) before
394 UCR4((u32)sport->port.membase) &= ~UCR4_DREN;
399 retval = request_irq(sport->rxirq, imx_rxint, 0,
401 if (retval) goto error_out1;
403 retval = request_irq(sport->txirq, imx_txint, 0,
405 if (retval) goto error_out2;
407 retval = request_irq(sport->rtsirq, imx_rtsint,
408 SA_TRIGGER_FALLING | SA_TRIGGER_RISING,
410 if (retval) goto error_out3;
413 * Finally, clear and enable interrupts
416 USR1((u32)sport->port.membase) = USR1_RTSD;
417 UCR1((u32)sport->port.membase) |=
418 (UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN);
420 UCR2((u32)sport->port.membase) |= (UCR2_RXEN | UCR2_TXEN);
422 * Enable modem status interrupts
424 spin_lock_irqsave(&sport->port.lock,flags);
425 imx_enable_ms(&sport->port);
426 spin_unlock_irqrestore(&sport->port.lock,flags);
431 free_irq(sport->txirq, sport);
433 free_irq(sport->rxirq, sport);
438 static void imx_shutdown(struct uart_port *port)
440 struct imx_port *sport = (struct imx_port *)port;
445 del_timer_sync(&sport->timer);
448 * Free the interrupts
450 free_irq(sport->rtsirq, sport);
451 free_irq(sport->txirq, sport);
452 free_irq(sport->rxirq, sport);
455 * Disable all interrupts, port and break condition.
458 UCR1((u32)sport->port.membase) &=
459 ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN);
463 imx_set_termios(struct uart_port *port, struct termios *termios,
466 struct imx_port *sport = (struct imx_port *)port;
468 unsigned int ucr2, old_ucr1, old_txrxen, baud, quot;
469 unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
472 * If we don't support modem control lines, don't allow
476 termios->c_cflag &= ~(HUPCL | CRTSCTS | CMSPAR);
477 termios->c_cflag |= CLOCAL;
481 * We only support CS7 and CS8.
483 while ((termios->c_cflag & CSIZE) != CS7 &&
484 (termios->c_cflag & CSIZE) != CS8) {
485 termios->c_cflag &= ~CSIZE;
486 termios->c_cflag |= old_csize;
490 if ((termios->c_cflag & CSIZE) == CS8)
491 ucr2 = UCR2_WS | UCR2_SRST | UCR2_IRTS;
493 ucr2 = UCR2_SRST | UCR2_IRTS;
495 if (termios->c_cflag & CRTSCTS) {
496 if( sport->have_rtscts ) {
500 termios->c_cflag &= ~CRTSCTS;
504 if (termios->c_cflag & CSTOPB)
506 if (termios->c_cflag & PARENB) {
508 if (termios->c_cflag & PARODD)
513 * Ask the core to calculate the divisor for us.
515 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
516 quot = uart_get_divisor(port, baud);
518 spin_lock_irqsave(&sport->port.lock, flags);
520 sport->port.read_status_mask = 0;
521 if (termios->c_iflag & INPCK)
522 sport->port.read_status_mask |= (URXD_FRMERR | URXD_PRERR);
523 if (termios->c_iflag & (BRKINT | PARMRK))
524 sport->port.read_status_mask |= URXD_BRK;
527 * Characters to ignore
529 sport->port.ignore_status_mask = 0;
530 if (termios->c_iflag & IGNPAR)
531 sport->port.ignore_status_mask |= URXD_PRERR;
532 if (termios->c_iflag & IGNBRK) {
533 sport->port.ignore_status_mask |= URXD_BRK;
535 * If we're ignoring parity and break indicators,
536 * ignore overruns too (for real raw support).
538 if (termios->c_iflag & IGNPAR)
539 sport->port.ignore_status_mask |= URXD_OVRRUN;
542 del_timer_sync(&sport->timer);
545 * Update the per-port timeout.
547 uart_update_timeout(port, termios->c_cflag, baud);
550 * disable interrupts and drain transmitter
552 old_ucr1 = UCR1((u32)sport->port.membase);
553 UCR1((u32)sport->port.membase) &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN);
555 while ( !(USR2((u32)sport->port.membase) & USR2_TXDC))
558 /* then, disable everything */
559 old_txrxen = UCR2((u32)sport->port.membase) & ( UCR2_TXEN | UCR2_RXEN );
560 UCR2((u32)sport->port.membase) &= ~( UCR2_TXEN | UCR2_RXEN);
562 /* set the parity, stop bits and data size */
563 UCR2((u32)sport->port.membase) = ucr2;
565 /* set the baud rate. We assume uartclk = 16 MHz
568 * --------- = --------
571 UBIR((u32)sport->port.membase) = (baud / 100) - 1;
572 UBMR((u32)sport->port.membase) = 10000 - 1;
574 UCR1((u32)sport->port.membase) = old_ucr1;
575 UCR2((u32)sport->port.membase) |= old_txrxen;
577 if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
578 imx_enable_ms(&sport->port);
580 spin_unlock_irqrestore(&sport->port.lock, flags);
583 static const char *imx_type(struct uart_port *port)
585 struct imx_port *sport = (struct imx_port *)port;
587 return sport->port.type == PORT_IMX ? "IMX" : NULL;
591 * Release the memory region(s) being used by 'port'.
593 static void imx_release_port(struct uart_port *port)
595 struct imx_port *sport = (struct imx_port *)port;
597 release_mem_region(sport->port.mapbase, UART_PORT_SIZE);
601 * Request the memory region(s) being used by 'port'.
603 static int imx_request_port(struct uart_port *port)
605 struct imx_port *sport = (struct imx_port *)port;
607 return request_mem_region(sport->port.mapbase, UART_PORT_SIZE,
608 "imx-uart") != NULL ? 0 : -EBUSY;
612 * Configure/autoconfigure the port.
614 static void imx_config_port(struct uart_port *port, int flags)
616 struct imx_port *sport = (struct imx_port *)port;
618 if (flags & UART_CONFIG_TYPE &&
619 imx_request_port(&sport->port) == 0)
620 sport->port.type = PORT_IMX;
624 * Verify the new serial_struct (for TIOCSSERIAL).
625 * The only change we allow are to the flags and type, and
626 * even then only between PORT_IMX and PORT_UNKNOWN
629 imx_verify_port(struct uart_port *port, struct serial_struct *ser)
631 struct imx_port *sport = (struct imx_port *)port;
634 if (ser->type != PORT_UNKNOWN && ser->type != PORT_IMX)
636 if (sport->port.irq != ser->irq)
638 if (ser->io_type != UPIO_MEM)
640 if (sport->port.uartclk / 16 != ser->baud_base)
642 if ((void *)sport->port.mapbase != ser->iomem_base)
644 if (sport->port.iobase != ser->port)
651 static struct uart_ops imx_pops = {
652 .tx_empty = imx_tx_empty,
653 .set_mctrl = imx_set_mctrl,
654 .get_mctrl = imx_get_mctrl,
655 .stop_tx = imx_stop_tx,
656 .start_tx = imx_start_tx,
657 .stop_rx = imx_stop_rx,
658 .enable_ms = imx_enable_ms,
659 .break_ctl = imx_break_ctl,
660 .startup = imx_startup,
661 .shutdown = imx_shutdown,
662 .set_termios = imx_set_termios,
664 .release_port = imx_release_port,
665 .request_port = imx_request_port,
666 .config_port = imx_config_port,
667 .verify_port = imx_verify_port,
670 static struct imx_port imx_ports[] = {
672 .txirq = UART1_MINT_TX,
673 .rxirq = UART1_MINT_RX,
674 .rtsirq = UART1_MINT_RTS,
678 .membase = (void *)IMX_UART1_BASE,
679 .mapbase = IMX_UART1_BASE, /* FIXME */
680 .irq = UART1_MINT_RX,
683 .flags = UPF_BOOT_AUTOCONF,
688 .txirq = UART2_MINT_TX,
689 .rxirq = UART2_MINT_RX,
690 .rtsirq = UART2_MINT_RTS,
694 .membase = (void *)IMX_UART2_BASE,
695 .mapbase = IMX_UART2_BASE, /* FIXME */
696 .irq = UART2_MINT_RX,
699 .flags = UPF_BOOT_AUTOCONF,
707 * Setup the IMX serial ports.
708 * Note also that we support "console=ttySMXx" where "x" is either 0 or 1.
709 * Which serial port this ends up being depends on the machine you're
710 * running this kernel on. I'm not convinced that this is a good idea,
711 * but that's the way it traditionally works.
714 static void __init imx_init_ports(void)
716 static int first = 1;
723 for (i = 0; i < ARRAY_SIZE(imx_ports); i++) {
724 init_timer(&imx_ports[i].timer);
725 imx_ports[i].timer.function = imx_timeout;
726 imx_ports[i].timer.data = (unsigned long)&imx_ports[i];
730 #ifdef CONFIG_SERIAL_IMX_CONSOLE
731 static void imx_console_putchar(struct uart_port *port, int ch)
733 struct imx_port *sport = (struct imx_port *)port;
734 while ((UTS((u32)sport->port.membase) & UTS_TXFULL))
736 URTX0((u32)sport->port.membase) = ch;
740 * Interrupts are disabled on entering
743 imx_console_write(struct console *co, const char *s, unsigned int count)
745 struct imx_port *sport = &imx_ports[co->index];
746 unsigned int old_ucr1, old_ucr2;
749 * First, save UCR1/2 and then disable interrupts
751 old_ucr1 = UCR1((u32)sport->port.membase);
752 old_ucr2 = UCR2((u32)sport->port.membase);
754 UCR1((u32)sport->port.membase) =
755 (old_ucr1 | UCR1_UARTCLKEN | UCR1_UARTEN)
756 & ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN);
757 UCR2((u32)sport->port.membase) = old_ucr2 | UCR2_TXEN;
759 uart_console_write(&sport->port, s, count, imx_console_putchar);
762 * Finally, wait for transmitter to become empty
765 while (!(USR2((u32)sport->port.membase) & USR2_TXDC));
767 UCR1((u32)sport->port.membase) = old_ucr1;
768 UCR2((u32)sport->port.membase) = old_ucr2;
772 * If the port was already initialised (eg, by a boot loader),
773 * try to determine the current setup.
776 imx_console_get_options(struct imx_port *sport, int *baud,
777 int *parity, int *bits)
780 if ( UCR1((u32)sport->port.membase) | UCR1_UARTEN ) {
781 /* ok, the port was enabled */
782 unsigned int ucr2, ubir,ubmr, uartclk;
783 unsigned int baud_raw;
784 unsigned int ucfr_rfdiv;
786 ucr2 = UCR2((u32)sport->port.membase);
789 if (ucr2 & UCR2_PREN) {
790 if (ucr2 & UCR2_PROE)
801 ubir = UBIR((u32)sport->port.membase) & 0xffff;
802 ubmr = UBMR((u32)sport->port.membase) & 0xffff;
805 ucfr_rfdiv = (UFCR((u32)sport->port.membase) & UFCR_RFDIV) >> 7;
809 ucfr_rfdiv = 6 - ucfr_rfdiv;
811 uartclk = imx_get_perclk1();
812 uartclk /= ucfr_rfdiv;
815 * The next code provides exact computation of
816 * baud_raw = round(((uartclk/16) * (ubir + 1)) / (ubmr + 1))
817 * without need of float support or long long division,
818 * which would be required to prevent 32bit arithmetic overflow
820 unsigned int mul = ubir + 1;
821 unsigned int div = 16 * (ubmr + 1);
822 unsigned int rem = uartclk % div;
824 baud_raw = (uartclk / div) * mul;
825 baud_raw += (rem * mul + div / 2) / div;
826 *baud = (baud_raw + 50) / 100 * 100;
829 if(*baud != baud_raw)
830 printk(KERN_INFO "Serial: Console IMX rounded baud rate from %d to %d\n",
836 imx_console_setup(struct console *co, char *options)
838 struct imx_port *sport;
845 * Check whether an invalid uart number has been specified, and
846 * if so, search for the first available port that does have
849 if (co->index == -1 || co->index >= ARRAY_SIZE(imx_ports))
851 sport = &imx_ports[co->index];
854 uart_parse_options(options, &baud, &parity, &bits, &flow);
856 imx_console_get_options(sport, &baud, &parity, &bits);
858 imx_setup_ufcr(sport, 0);
860 return uart_set_options(&sport->port, co, baud, parity, bits, flow);
863 static struct uart_driver imx_reg;
864 static struct console imx_console = {
866 .write = imx_console_write,
867 .device = uart_console_device,
868 .setup = imx_console_setup,
869 .flags = CON_PRINTBUFFER,
874 static int __init imx_rs_console_init(void)
877 register_console(&imx_console);
880 console_initcall(imx_rs_console_init);
882 #define IMX_CONSOLE &imx_console
884 #define IMX_CONSOLE NULL
887 static struct uart_driver imx_reg = {
888 .owner = THIS_MODULE,
889 .driver_name = DRIVER_NAME,
890 .dev_name = "ttySMX",
891 .devfs_name = "ttsmx/",
892 .major = SERIAL_IMX_MAJOR,
893 .minor = MINOR_START,
894 .nr = ARRAY_SIZE(imx_ports),
898 static int serial_imx_suspend(struct platform_device *dev, pm_message_t state)
900 struct imx_port *sport = platform_get_drvdata(dev);
903 uart_suspend_port(&imx_reg, &sport->port);
908 static int serial_imx_resume(struct platform_device *dev)
910 struct imx_port *sport = platform_get_drvdata(dev);
913 uart_resume_port(&imx_reg, &sport->port);
918 static int serial_imx_probe(struct platform_device *dev)
920 struct imxuart_platform_data *pdata;
922 imx_ports[dev->id].port.dev = &dev->dev;
924 pdata = (struct imxuart_platform_data *)dev->dev.platform_data;
925 if(pdata && (pdata->flags & IMXUART_HAVE_RTSCTS))
926 imx_ports[dev->id].have_rtscts = 1;
928 uart_add_one_port(&imx_reg, &imx_ports[dev->id].port);
929 platform_set_drvdata(dev, &imx_ports[dev->id]);
933 static int serial_imx_remove(struct platform_device *dev)
935 struct imx_port *sport = platform_get_drvdata(dev);
937 platform_set_drvdata(dev, NULL);
940 uart_remove_one_port(&imx_reg, &sport->port);
945 static struct platform_driver serial_imx_driver = {
946 .probe = serial_imx_probe,
947 .remove = serial_imx_remove,
949 .suspend = serial_imx_suspend,
950 .resume = serial_imx_resume,
956 static int __init imx_serial_init(void)
960 printk(KERN_INFO "Serial: IMX driver\n");
964 ret = uart_register_driver(&imx_reg);
968 ret = platform_driver_register(&serial_imx_driver);
970 uart_unregister_driver(&imx_reg);
975 static void __exit imx_serial_exit(void)
977 uart_unregister_driver(&imx_reg);
978 platform_driver_unregister(&serial_imx_driver);
981 module_init(imx_serial_init);
982 module_exit(imx_serial_exit);
984 MODULE_AUTHOR("Sascha Hauer");
985 MODULE_DESCRIPTION("IMX generic serial port driver");
986 MODULE_LICENSE("GPL");