2 * drivers/serial/mpc52xx_uart.c
4 * Driver for the PSC of the Freescale MPC52xx PSCs configured as UARTs.
6 * FIXME According to the usermanual the status bits in the status register
7 * are only updated when the peripherals access the FIFO and not when the
8 * CPU access them. So since we use this bits to know when we stop writing
9 * and reading, they may not be updated in-time and a race condition may
10 * exists. But I haven't be able to prove this and I don't care. But if
11 * any problem arises, it might worth checking. The TX/RX FIFO Stats
12 * registers should be used in addition.
13 * Update: Actually, they seem updated ... At least the bits we use.
16 * Maintainer : Sylvain Munaut <tnt@246tNt.com>
18 * Some of the code has been inspired/copied from the 2.4 code written
19 * by Dale Farnsworth <dfarnsworth@mvista.com>.
21 * Copyright (C) 2004-2005 Sylvain Munaut <tnt@246tNt.com>
22 * Copyright (C) 2003 MontaVista, Software, Inc.
24 * This file is licensed under the terms of the GNU General Public License
25 * version 2. This program is licensed "as is" without any warranty of any
26 * kind, whether express or implied.
29 /* Platform device Usage :
31 * Since PSCs can have multiple function, the correct driver for each one
32 * is selected by calling mpc52xx_match_psc_function(...). The function
33 * handled by this driver is "uart".
35 * The driver init all necessary registers to place the PSC in uart mode without
36 * DCD. However, the pin multiplexing aren't changed and should be set either
37 * by the bootloader or in the platform init code.
39 * The idx field must be equal to the PSC index ( e.g. 0 for PSC1, 1 for PSC2,
40 * and so on). So the PSC1 is mapped to /dev/ttyPSC0, PSC2 to /dev/ttyPSC1 and
41 * so on. But be warned, it's an ABSOLUTE REQUIREMENT ! This is needed mainly
42 * fpr the console code : without this 1:1 mapping, at early boot time, when we
43 * are parsing the kernel args console=ttyPSC?, we wouldn't know which PSC it
47 #include <linux/platform_device.h>
48 #include <linux/module.h>
49 #include <linux/tty.h>
50 #include <linux/serial.h>
51 #include <linux/sysrq.h>
52 #include <linux/console.h>
54 #include <asm/delay.h>
57 #include <asm/mpc52xx.h>
58 #include <asm/mpc52xx_psc.h>
60 #if defined(CONFIG_SERIAL_MPC52xx_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
64 #include <linux/serial_core.h>
67 /* We've been assigned a range on the "Low-density serial ports" major */
68 #define SERIAL_PSC_MAJOR 204
69 #define SERIAL_PSC_MINOR 148
72 #define ISR_PASS_LIMIT 256 /* Max number of iteration in the interrupt */
75 static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM];
76 /* Rem: - We use the read_status_mask as a shadow of
77 * psc->mpc52xx_psc_imr
78 * - It's important that is array is all zero on start as we
79 * use it to know if it's initialized or not ! If it's not sure
80 * it's cleared, then a memset(...,0,...) should be added to
84 #define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase))
87 /* Forward declaration of the interruption handling routine */
88 static irqreturn_t mpc52xx_uart_int(int irq,void *dev_id,struct pt_regs *regs);
91 /* Simple macro to test if a port is console or not. This one is taken
92 * for serial_core.c and maybe should be moved to serial_core.h ? */
93 #ifdef CONFIG_SERIAL_CORE_CONSOLE
94 #define uart_console(port) ((port)->cons && (port)->cons->index == (port)->line)
96 #define uart_console(port) (0)
100 /* ======================================================================== */
101 /* UART operations */
102 /* ======================================================================== */
105 mpc52xx_uart_tx_empty(struct uart_port *port)
107 int status = in_be16(&PSC(port)->mpc52xx_psc_status);
108 return (status & MPC52xx_PSC_SR_TXEMP) ? TIOCSER_TEMT : 0;
112 mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
114 /* Not implemented */
118 mpc52xx_uart_get_mctrl(struct uart_port *port)
120 /* Not implemented */
121 return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
125 mpc52xx_uart_stop_tx(struct uart_port *port)
127 /* port->lock taken by caller */
128 port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY;
129 out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask);
133 mpc52xx_uart_start_tx(struct uart_port *port)
135 /* port->lock taken by caller */
136 port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
137 out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask);
141 mpc52xx_uart_send_xchar(struct uart_port *port, char ch)
144 spin_lock_irqsave(&port->lock, flags);
148 /* Make sure tx interrupts are on */
149 /* Truly necessary ??? They should be anyway */
150 port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
151 out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask);
154 spin_unlock_irqrestore(&port->lock, flags);
158 mpc52xx_uart_stop_rx(struct uart_port *port)
160 /* port->lock taken by caller */
161 port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY;
162 out_be16(&PSC(port)->mpc52xx_psc_imr,port->read_status_mask);
166 mpc52xx_uart_enable_ms(struct uart_port *port)
168 /* Not implemented */
172 mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
175 spin_lock_irqsave(&port->lock, flags);
178 out_8(&PSC(port)->command,MPC52xx_PSC_START_BRK);
180 out_8(&PSC(port)->command,MPC52xx_PSC_STOP_BRK);
182 spin_unlock_irqrestore(&port->lock, flags);
186 mpc52xx_uart_startup(struct uart_port *port)
188 struct mpc52xx_psc __iomem *psc = PSC(port);
192 ret = request_irq(port->irq, mpc52xx_uart_int,
193 IRQF_DISABLED | IRQF_SAMPLE_RANDOM, "mpc52xx_psc_uart", port);
197 /* Reset/activate the port, clear and enable interrupts */
198 out_8(&psc->command,MPC52xx_PSC_RST_RX);
199 out_8(&psc->command,MPC52xx_PSC_RST_TX);
201 out_be32(&psc->sicr,0); /* UART mode DCD ignored */
203 out_be16(&psc->mpc52xx_psc_clock_select, 0xdd00); /* /16 prescaler on */
205 out_8(&psc->rfcntl, 0x00);
206 out_be16(&psc->rfalarm, 0x1ff);
207 out_8(&psc->tfcntl, 0x07);
208 out_be16(&psc->tfalarm, 0x80);
210 port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY;
211 out_be16(&psc->mpc52xx_psc_imr,port->read_status_mask);
213 out_8(&psc->command,MPC52xx_PSC_TX_ENABLE);
214 out_8(&psc->command,MPC52xx_PSC_RX_ENABLE);
220 mpc52xx_uart_shutdown(struct uart_port *port)
222 struct mpc52xx_psc __iomem *psc = PSC(port);
224 /* Shut down the port, interrupt and all */
225 out_8(&psc->command,MPC52xx_PSC_RST_RX);
226 out_8(&psc->command,MPC52xx_PSC_RST_TX);
228 port->read_status_mask = 0;
229 out_be16(&psc->mpc52xx_psc_imr,port->read_status_mask);
231 /* Release interrupt */
232 free_irq(port->irq, port);
236 mpc52xx_uart_set_termios(struct uart_port *port, struct termios *new,
239 struct mpc52xx_psc __iomem *psc = PSC(port);
241 unsigned char mr1, mr2;
243 unsigned int j, baud, quot;
245 /* Prepare what we're gonna write */
248 switch (new->c_cflag & CSIZE) {
249 case CS5: mr1 |= MPC52xx_PSC_MODE_5_BITS;
251 case CS6: mr1 |= MPC52xx_PSC_MODE_6_BITS;
253 case CS7: mr1 |= MPC52xx_PSC_MODE_7_BITS;
256 default: mr1 |= MPC52xx_PSC_MODE_8_BITS;
259 if (new->c_cflag & PARENB) {
260 mr1 |= (new->c_cflag & PARODD) ?
261 MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
263 mr1 |= MPC52xx_PSC_MODE_PARNONE;
268 if (new->c_cflag & CSTOPB)
269 mr2 |= MPC52xx_PSC_MODE_TWO_STOP;
271 mr2 |= ((new->c_cflag & CSIZE) == CS5) ?
272 MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
273 MPC52xx_PSC_MODE_ONE_STOP;
276 baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
277 quot = uart_get_divisor(port, baud);
281 spin_lock_irqsave(&port->lock, flags);
283 /* Update the per-port timeout */
284 uart_update_timeout(port, new->c_cflag, baud);
286 /* Do our best to flush TX & RX, so we don't loose anything */
287 /* But we don't wait indefinitly ! */
288 j = 5000000; /* Maximum wait */
289 /* FIXME Can't receive chars since set_termios might be called at early
290 * boot for the console, all stuff is not yet ready to receive at that
291 * time and that just makes the kernel oops */
292 /* while (j-- && mpc52xx_uart_int_rx_chars(port)); */
293 while (!(in_be16(&psc->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXEMP) &&
298 printk( KERN_ERR "mpc52xx_uart.c: "
299 "Unable to flush RX & TX fifos in-time in set_termios."
300 "Some chars may have been lost.\n" );
302 /* Reset the TX & RX */
303 out_8(&psc->command,MPC52xx_PSC_RST_RX);
304 out_8(&psc->command,MPC52xx_PSC_RST_TX);
306 /* Send new mode settings */
307 out_8(&psc->command,MPC52xx_PSC_SEL_MODE_REG_1);
308 out_8(&psc->mode,mr1);
309 out_8(&psc->mode,mr2);
310 out_8(&psc->ctur,ctr >> 8);
311 out_8(&psc->ctlr,ctr & 0xff);
313 /* Reenable TX & RX */
314 out_8(&psc->command,MPC52xx_PSC_TX_ENABLE);
315 out_8(&psc->command,MPC52xx_PSC_RX_ENABLE);
317 /* We're all set, release the lock */
318 spin_unlock_irqrestore(&port->lock, flags);
322 mpc52xx_uart_type(struct uart_port *port)
324 return port->type == PORT_MPC52xx ? "MPC52xx PSC" : NULL;
328 mpc52xx_uart_release_port(struct uart_port *port)
330 if (port->flags & UPF_IOREMAP) { /* remapped by us ? */
331 iounmap(port->membase);
332 port->membase = NULL;
335 release_mem_region(port->mapbase, MPC52xx_PSC_SIZE);
339 mpc52xx_uart_request_port(struct uart_port *port)
341 if (port->flags & UPF_IOREMAP) /* Need to remap ? */
342 port->membase = ioremap(port->mapbase, MPC52xx_PSC_SIZE);
347 return request_mem_region(port->mapbase, MPC52xx_PSC_SIZE,
348 "mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
352 mpc52xx_uart_config_port(struct uart_port *port, int flags)
354 if ( (flags & UART_CONFIG_TYPE) &&
355 (mpc52xx_uart_request_port(port) == 0) )
356 port->type = PORT_MPC52xx;
360 mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
362 if ( ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx )
365 if ( (ser->irq != port->irq) ||
366 (ser->io_type != SERIAL_IO_MEM) ||
367 (ser->baud_base != port->uartclk) ||
368 (ser->iomem_base != (void*)port->mapbase) ||
376 static struct uart_ops mpc52xx_uart_ops = {
377 .tx_empty = mpc52xx_uart_tx_empty,
378 .set_mctrl = mpc52xx_uart_set_mctrl,
379 .get_mctrl = mpc52xx_uart_get_mctrl,
380 .stop_tx = mpc52xx_uart_stop_tx,
381 .start_tx = mpc52xx_uart_start_tx,
382 .send_xchar = mpc52xx_uart_send_xchar,
383 .stop_rx = mpc52xx_uart_stop_rx,
384 .enable_ms = mpc52xx_uart_enable_ms,
385 .break_ctl = mpc52xx_uart_break_ctl,
386 .startup = mpc52xx_uart_startup,
387 .shutdown = mpc52xx_uart_shutdown,
388 .set_termios = mpc52xx_uart_set_termios,
389 /* .pm = mpc52xx_uart_pm, Not supported yet */
390 /* .set_wake = mpc52xx_uart_set_wake, Not supported yet */
391 .type = mpc52xx_uart_type,
392 .release_port = mpc52xx_uart_release_port,
393 .request_port = mpc52xx_uart_request_port,
394 .config_port = mpc52xx_uart_config_port,
395 .verify_port = mpc52xx_uart_verify_port
399 /* ======================================================================== */
400 /* Interrupt handling */
401 /* ======================================================================== */
404 mpc52xx_uart_int_rx_chars(struct uart_port *port, struct pt_regs *regs)
406 struct tty_struct *tty = port->info->tty;
407 unsigned char ch, flag;
408 unsigned short status;
410 /* While we can read, do so ! */
411 while ( (status = in_be16(&PSC(port)->mpc52xx_psc_status)) &
412 MPC52xx_PSC_SR_RXRDY) {
415 ch = in_8(&PSC(port)->mpc52xx_psc_buffer_8);
417 /* Handle sysreq char */
419 if (uart_handle_sysrq_char(port, ch, regs)) {
430 if ( status & (MPC52xx_PSC_SR_PE |
432 MPC52xx_PSC_SR_RB) ) {
434 if (status & MPC52xx_PSC_SR_RB) {
436 uart_handle_break(port);
437 } else if (status & MPC52xx_PSC_SR_PE)
439 else if (status & MPC52xx_PSC_SR_FE)
442 /* Clear error condition */
443 out_8(&PSC(port)->command,MPC52xx_PSC_RST_ERR_STAT);
446 tty_insert_flip_char(tty, ch, flag);
447 if (status & MPC52xx_PSC_SR_OE) {
449 * Overrun is special, since it's
450 * reported immediately, and doesn't
451 * affect the current character
453 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
457 tty_flip_buffer_push(tty);
459 return in_be16(&PSC(port)->mpc52xx_psc_status) & MPC52xx_PSC_SR_RXRDY;
463 mpc52xx_uart_int_tx_chars(struct uart_port *port)
465 struct circ_buf *xmit = &port->info->xmit;
467 /* Process out of band chars */
469 out_8(&PSC(port)->mpc52xx_psc_buffer_8, port->x_char);
475 /* Nothing to do ? */
476 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
477 mpc52xx_uart_stop_tx(port);
482 while (in_be16(&PSC(port)->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXRDY) {
483 out_8(&PSC(port)->mpc52xx_psc_buffer_8, xmit->buf[xmit->tail]);
484 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
486 if (uart_circ_empty(xmit))
491 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
492 uart_write_wakeup(port);
494 /* Maybe we're done after all */
495 if (uart_circ_empty(xmit)) {
496 mpc52xx_uart_stop_tx(port);
504 mpc52xx_uart_int(int irq, void *dev_id, struct pt_regs *regs)
506 struct uart_port *port = (struct uart_port *) dev_id;
507 unsigned long pass = ISR_PASS_LIMIT;
508 unsigned int keepgoing;
509 unsigned short status;
511 if ( irq != port->irq ) {
513 "mpc52xx_uart_int : " \
514 "Received wrong int %d. Waiting for %d\n",
519 spin_lock(&port->lock);
521 /* While we have stuff to do, we continue */
523 /* If we don't find anything to do, we stop */
527 status = in_be16(&PSC(port)->mpc52xx_psc_isr);
528 status &= port->read_status_mask;
530 /* Do we need to receive chars ? */
531 /* For this RX interrupts must be on and some chars waiting */
532 if ( status & MPC52xx_PSC_IMR_RXRDY )
533 keepgoing |= mpc52xx_uart_int_rx_chars(port, regs);
535 /* Do we need to send chars ? */
536 /* For this, TX must be ready and TX interrupt enabled */
537 if ( status & MPC52xx_PSC_IMR_TXRDY )
538 keepgoing |= mpc52xx_uart_int_tx_chars(port);
540 /* Limit number of iteration */
546 spin_unlock(&port->lock);
552 /* ======================================================================== */
553 /* Console ( if applicable ) */
554 /* ======================================================================== */
556 #ifdef CONFIG_SERIAL_MPC52xx_CONSOLE
559 mpc52xx_console_get_options(struct uart_port *port,
560 int *baud, int *parity, int *bits, int *flow)
562 struct mpc52xx_psc __iomem *psc = PSC(port);
565 /* Read the mode registers */
566 out_8(&psc->command,MPC52xx_PSC_SEL_MODE_REG_1);
567 mr1 = in_8(&psc->mode);
569 /* CT{U,L}R are write-only ! */
570 *baud = __res.bi_baudrate ?
571 __res.bi_baudrate : CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
574 switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
575 case MPC52xx_PSC_MODE_5_BITS: *bits = 5; break;
576 case MPC52xx_PSC_MODE_6_BITS: *bits = 6; break;
577 case MPC52xx_PSC_MODE_7_BITS: *bits = 7; break;
578 case MPC52xx_PSC_MODE_8_BITS:
582 if (mr1 & MPC52xx_PSC_MODE_PARNONE)
585 *parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
589 mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
591 struct uart_port *port = &mpc52xx_uart_ports[co->index];
592 struct mpc52xx_psc __iomem *psc = PSC(port);
595 /* Disable interrupts */
596 out_be16(&psc->mpc52xx_psc_imr, 0);
598 /* Wait the TX buffer to be empty */
599 j = 5000000; /* Maximum wait */
600 while (!(in_be16(&psc->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXEMP) &&
604 /* Write all the chars */
605 for (i = 0; i < count; i++, s++) {
606 /* Line return handling */
608 out_8(&psc->mpc52xx_psc_buffer_8, '\r');
611 out_8(&psc->mpc52xx_psc_buffer_8, *s);
613 /* Wait the TX buffer to be empty */
614 j = 20000; /* Maximum wait */
615 while (!(in_be16(&psc->mpc52xx_psc_status) &
616 MPC52xx_PSC_SR_TXEMP) && --j)
620 /* Restore interrupt state */
621 out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
625 mpc52xx_console_setup(struct console *co, char *options)
627 struct uart_port *port = &mpc52xx_uart_ports[co->index];
629 int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
634 if (co->index < 0 || co->index >= MPC52xx_PSC_MAXNUM)
637 /* Basic port init. Needed since we use some uart_??? func before
638 * real init for early access */
639 spin_lock_init(&port->lock);
640 port->uartclk = __res.bi_ipbfreq / 2; /* Look at CTLR doc */
641 port->ops = &mpc52xx_uart_ops;
642 port->mapbase = MPC52xx_PA(MPC52xx_PSCx_OFFSET(co->index+1));
644 /* We ioremap ourself */
645 port->membase = ioremap(port->mapbase, MPC52xx_PSC_SIZE);
646 if (port->membase == NULL)
649 /* Setup the port parameters accoding to options */
651 uart_parse_options(options, &baud, &parity, &bits, &flow);
653 mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
655 return uart_set_options(port, co, baud, parity, bits, flow);
659 static struct uart_driver mpc52xx_uart_driver;
661 static struct console mpc52xx_console = {
663 .write = mpc52xx_console_write,
664 .device = uart_console_device,
665 .setup = mpc52xx_console_setup,
666 .flags = CON_PRINTBUFFER,
667 .index = -1, /* Specified on the cmdline (e.g. console=ttyPSC0 ) */
668 .data = &mpc52xx_uart_driver,
673 mpc52xx_console_init(void)
675 register_console(&mpc52xx_console);
679 console_initcall(mpc52xx_console_init);
681 #define MPC52xx_PSC_CONSOLE &mpc52xx_console
683 #define MPC52xx_PSC_CONSOLE NULL
687 /* ======================================================================== */
689 /* ======================================================================== */
691 static struct uart_driver mpc52xx_uart_driver = {
692 .owner = THIS_MODULE,
693 .driver_name = "mpc52xx_psc_uart",
694 .dev_name = "ttyPSC",
695 .major = SERIAL_PSC_MAJOR,
696 .minor = SERIAL_PSC_MINOR,
697 .nr = MPC52xx_PSC_MAXNUM,
698 .cons = MPC52xx_PSC_CONSOLE,
702 /* ======================================================================== */
703 /* Platform Driver */
704 /* ======================================================================== */
707 mpc52xx_uart_probe(struct platform_device *dev)
709 struct resource *res = dev->resource;
711 struct uart_port *port = NULL;
714 /* Check validity & presence */
716 if (idx < 0 || idx >= MPC52xx_PSC_MAXNUM)
719 if (!mpc52xx_match_psc_function(idx,"uart"))
722 /* Init the port structure */
723 port = &mpc52xx_uart_ports[idx];
725 memset(port, 0x00, sizeof(struct uart_port));
727 spin_lock_init(&port->lock);
728 port->uartclk = __res.bi_ipbfreq / 2; /* Look at CTLR doc */
729 port->fifosize = 255; /* Should be 512 ! But it can't be */
730 /* stored in a unsigned char */
731 port->iotype = UPIO_MEM;
732 port->flags = UPF_BOOT_AUTOCONF |
733 ( uart_console(port) ? 0 : UPF_IOREMAP );
735 port->ops = &mpc52xx_uart_ops;
737 /* Search for IRQ and mapbase */
738 for (i=0 ; i<dev->num_resources ; i++, res++) {
739 if (res->flags & IORESOURCE_MEM)
740 port->mapbase = res->start;
741 else if (res->flags & IORESOURCE_IRQ)
742 port->irq = res->start;
744 if (!port->irq || !port->mapbase)
747 /* Add the port to the uart sub-system */
748 ret = uart_add_one_port(&mpc52xx_uart_driver, port);
750 platform_set_drvdata(dev, (void*)port);
756 mpc52xx_uart_remove(struct platform_device *dev)
758 struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev);
760 platform_set_drvdata(dev, NULL);
763 uart_remove_one_port(&mpc52xx_uart_driver, port);
770 mpc52xx_uart_suspend(struct platform_device *dev, pm_message_t state)
772 struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev);
775 uart_suspend_port(&mpc52xx_uart_driver, port);
781 mpc52xx_uart_resume(struct platform_device *dev)
783 struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev);
786 uart_resume_port(&mpc52xx_uart_driver, port);
792 static struct platform_driver mpc52xx_uart_platform_driver = {
793 .probe = mpc52xx_uart_probe,
794 .remove = mpc52xx_uart_remove,
796 .suspend = mpc52xx_uart_suspend,
797 .resume = mpc52xx_uart_resume,
800 .name = "mpc52xx-psc",
805 /* ======================================================================== */
807 /* ======================================================================== */
810 mpc52xx_uart_init(void)
814 printk(KERN_INFO "Serial: MPC52xx PSC driver\n");
816 ret = uart_register_driver(&mpc52xx_uart_driver);
818 ret = platform_driver_register(&mpc52xx_uart_platform_driver);
820 uart_unregister_driver(&mpc52xx_uart_driver);
827 mpc52xx_uart_exit(void)
829 platform_driver_unregister(&mpc52xx_uart_platform_driver);
830 uart_unregister_driver(&mpc52xx_uart_driver);
834 module_init(mpc52xx_uart_init);
835 module_exit(mpc52xx_uart_exit);
837 MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
838 MODULE_DESCRIPTION("Freescale MPC52xx PSC UART");
839 MODULE_LICENSE("GPL");