xref: /openbmc/linux/drivers/tty/serial/mcf.c (revision df0e68c1) 
1 // SPDX-License-Identifier: GPL-2.0+
2 /****************************************************************************/
3 
4 /*
5  *	mcf.c -- Freescale ColdFire UART driver
6  *
7  *	(C) Copyright 2003-2007, Greg Ungerer <gerg@uclinux.org>
8  */
9 
10 /****************************************************************************/
11 
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/interrupt.h>
15 #include <linux/module.h>
16 #include <linux/console.h>
17 #include <linux/tty.h>
18 #include <linux/tty_flip.h>
19 #include <linux/serial.h>
20 #include <linux/serial_core.h>
21 #include <linux/io.h>
22 #include <linux/uaccess.h>
23 #include <linux/platform_device.h>
24 #include <asm/coldfire.h>
25 #include <asm/mcfsim.h>
26 #include <asm/mcfuart.h>
27 #include <asm/nettel.h>
28 
29 /****************************************************************************/
30 
31 /*
32  *	Some boards implement the DTR/DCD lines using GPIO lines, most
33  *	don't. Dummy out the access macros for those that don't. Those
34  *	that do should define these macros somewhere in there board
35  *	specific inlude files.
36  */
37 #if !defined(mcf_getppdcd)
38 #define	mcf_getppdcd(p)		(1)
39 #endif
40 #if !defined(mcf_getppdtr)
41 #define	mcf_getppdtr(p)		(1)
42 #endif
43 #if !defined(mcf_setppdtr)
44 #define	mcf_setppdtr(p, v)	do { } while (0)
45 #endif
46 
47 /****************************************************************************/
48 
49 /*
50  *	Local per-uart structure.
51  */
52 struct mcf_uart {
53 	struct uart_port	port;
54 	unsigned int		sigs;		/* Local copy of line sigs */
55 	unsigned char		imr;		/* Local IMR mirror */
56 };
57 
58 /****************************************************************************/
59 
60 static unsigned int mcf_tx_empty(struct uart_port *port)
61 {
62 	return (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXEMPTY) ?
63 		TIOCSER_TEMT : 0;
64 }
65 
66 /****************************************************************************/
67 
68 static unsigned int mcf_get_mctrl(struct uart_port *port)
69 {
70 	struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
71 	unsigned int sigs;
72 
73 	sigs = (readb(port->membase + MCFUART_UIPR) & MCFUART_UIPR_CTS) ?
74 		0 : TIOCM_CTS;
75 	sigs |= (pp->sigs & TIOCM_RTS);
76 	sigs |= (mcf_getppdcd(port->line) ? TIOCM_CD : 0);
77 	sigs |= (mcf_getppdtr(port->line) ? TIOCM_DTR : 0);
78 
79 	return sigs;
80 }
81 
82 /****************************************************************************/
83 
84 static void mcf_set_mctrl(struct uart_port *port, unsigned int sigs)
85 {
86 	struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
87 
88 	pp->sigs = sigs;
89 	mcf_setppdtr(port->line, (sigs & TIOCM_DTR));
90 	if (sigs & TIOCM_RTS)
91 		writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP1);
92 	else
93 		writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP0);
94 }
95 
96 /****************************************************************************/
97 
98 static void mcf_start_tx(struct uart_port *port)
99 {
100 	struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
101 
102 	if (port->rs485.flags & SER_RS485_ENABLED) {
103 		/* Enable Transmitter */
104 		writeb(MCFUART_UCR_TXENABLE, port->membase + MCFUART_UCR);
105 		/* Manually assert RTS */
106 		writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP1);
107 	}
108 	pp->imr |= MCFUART_UIR_TXREADY;
109 	writeb(pp->imr, port->membase + MCFUART_UIMR);
110 }
111 
112 /****************************************************************************/
113 
114 static void mcf_stop_tx(struct uart_port *port)
115 {
116 	struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
117 
118 	pp->imr &= ~MCFUART_UIR_TXREADY;
119 	writeb(pp->imr, port->membase + MCFUART_UIMR);
120 }
121 
122 /****************************************************************************/
123 
124 static void mcf_stop_rx(struct uart_port *port)
125 {
126 	struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
127 
128 	pp->imr &= ~MCFUART_UIR_RXREADY;
129 	writeb(pp->imr, port->membase + MCFUART_UIMR);
130 }
131 
132 /****************************************************************************/
133 
134 static void mcf_break_ctl(struct uart_port *port, int break_state)
135 {
136 	unsigned long flags;
137 
138 	spin_lock_irqsave(&port->lock, flags);
139 	if (break_state == -1)
140 		writeb(MCFUART_UCR_CMDBREAKSTART, port->membase + MCFUART_UCR);
141 	else
142 		writeb(MCFUART_UCR_CMDBREAKSTOP, port->membase + MCFUART_UCR);
143 	spin_unlock_irqrestore(&port->lock, flags);
144 }
145 
146 /****************************************************************************/
147 
148 static int mcf_startup(struct uart_port *port)
149 {
150 	struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
151 	unsigned long flags;
152 
153 	spin_lock_irqsave(&port->lock, flags);
154 
155 	/* Reset UART, get it into known state... */
156 	writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
157 	writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
158 
159 	/* Enable the UART transmitter and receiver */
160 	writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE,
161 		port->membase + MCFUART_UCR);
162 
163 	/* Enable RX interrupts now */
164 	pp->imr = MCFUART_UIR_RXREADY;
165 	writeb(pp->imr, port->membase + MCFUART_UIMR);
166 
167 	spin_unlock_irqrestore(&port->lock, flags);
168 
169 	return 0;
170 }
171 
172 /****************************************************************************/
173 
174 static void mcf_shutdown(struct uart_port *port)
175 {
176 	struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
177 	unsigned long flags;
178 
179 	spin_lock_irqsave(&port->lock, flags);
180 
181 	/* Disable all interrupts now */
182 	pp->imr = 0;
183 	writeb(pp->imr, port->membase + MCFUART_UIMR);
184 
185 	/* Disable UART transmitter and receiver */
186 	writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
187 	writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
188 
189 	spin_unlock_irqrestore(&port->lock, flags);
190 }
191 
192 /****************************************************************************/
193 
194 static void mcf_set_termios(struct uart_port *port, struct ktermios *termios,
195 	struct ktermios *old)
196 {
197 	unsigned long flags;
198 	unsigned int baud, baudclk;
199 #if defined(CONFIG_M5272)
200 	unsigned int baudfr;
201 #endif
202 	unsigned char mr1, mr2;
203 
204 	baud = uart_get_baud_rate(port, termios, old, 0, 230400);
205 #if defined(CONFIG_M5272)
206 	baudclk = (MCF_BUSCLK / baud) / 32;
207 	baudfr = (((MCF_BUSCLK / baud) + 1) / 2) % 16;
208 #else
209 	baudclk = ((MCF_BUSCLK / baud) + 16) / 32;
210 #endif
211 
212 	mr1 = MCFUART_MR1_RXIRQRDY | MCFUART_MR1_RXERRCHAR;
213 	mr2 = 0;
214 
215 	switch (termios->c_cflag & CSIZE) {
216 	case CS5: mr1 |= MCFUART_MR1_CS5; break;
217 	case CS6: mr1 |= MCFUART_MR1_CS6; break;
218 	case CS7: mr1 |= MCFUART_MR1_CS7; break;
219 	case CS8:
220 	default:  mr1 |= MCFUART_MR1_CS8; break;
221 	}
222 
223 	if (termios->c_cflag & PARENB) {
224 		if (termios->c_cflag & CMSPAR) {
225 			if (termios->c_cflag & PARODD)
226 				mr1 |= MCFUART_MR1_PARITYMARK;
227 			else
228 				mr1 |= MCFUART_MR1_PARITYSPACE;
229 		} else {
230 			if (termios->c_cflag & PARODD)
231 				mr1 |= MCFUART_MR1_PARITYODD;
232 			else
233 				mr1 |= MCFUART_MR1_PARITYEVEN;
234 		}
235 	} else {
236 		mr1 |= MCFUART_MR1_PARITYNONE;
237 	}
238 
239 	/*
240 	 * FIXME: port->read_status_mask and port->ignore_status_mask
241 	 * need to be initialized based on termios settings for
242 	 * INPCK, IGNBRK, IGNPAR, PARMRK, BRKINT
243 	 */
244 
245 	if (termios->c_cflag & CSTOPB)
246 		mr2 |= MCFUART_MR2_STOP2;
247 	else
248 		mr2 |= MCFUART_MR2_STOP1;
249 
250 	if (termios->c_cflag & CRTSCTS) {
251 		mr1 |= MCFUART_MR1_RXRTS;
252 		mr2 |= MCFUART_MR2_TXCTS;
253 	}
254 
255 	spin_lock_irqsave(&port->lock, flags);
256 	if (port->rs485.flags & SER_RS485_ENABLED) {
257 		dev_dbg(port->dev, "Setting UART to RS485\n");
258 		mr2 |= MCFUART_MR2_TXRTS;
259 	}
260 
261 	uart_update_timeout(port, termios->c_cflag, baud);
262 	writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
263 	writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
264 	writeb(MCFUART_UCR_CMDRESETMRPTR, port->membase + MCFUART_UCR);
265 	writeb(mr1, port->membase + MCFUART_UMR);
266 	writeb(mr2, port->membase + MCFUART_UMR);
267 	writeb((baudclk & 0xff00) >> 8, port->membase + MCFUART_UBG1);
268 	writeb((baudclk & 0xff), port->membase + MCFUART_UBG2);
269 #if defined(CONFIG_M5272)
270 	writeb((baudfr & 0x0f), port->membase + MCFUART_UFPD);
271 #endif
272 	writeb(MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER,
273 		port->membase + MCFUART_UCSR);
274 	writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE,
275 		port->membase + MCFUART_UCR);
276 	spin_unlock_irqrestore(&port->lock, flags);
277 }
278 
279 /****************************************************************************/
280 
281 static void mcf_rx_chars(struct mcf_uart *pp)
282 {
283 	struct uart_port *port = &pp->port;
284 	unsigned char status, ch, flag;
285 
286 	while ((status = readb(port->membase + MCFUART_USR)) & MCFUART_USR_RXREADY) {
287 		ch = readb(port->membase + MCFUART_URB);
288 		flag = TTY_NORMAL;
289 		port->icount.rx++;
290 
291 		if (status & MCFUART_USR_RXERR) {
292 			writeb(MCFUART_UCR_CMDRESETERR,
293 				port->membase + MCFUART_UCR);
294 
295 			if (status & MCFUART_USR_RXBREAK) {
296 				port->icount.brk++;
297 				if (uart_handle_break(port))
298 					continue;
299 			} else if (status & MCFUART_USR_RXPARITY) {
300 				port->icount.parity++;
301 			} else if (status & MCFUART_USR_RXOVERRUN) {
302 				port->icount.overrun++;
303 			} else if (status & MCFUART_USR_RXFRAMING) {
304 				port->icount.frame++;
305 			}
306 
307 			status &= port->read_status_mask;
308 
309 			if (status & MCFUART_USR_RXBREAK)
310 				flag = TTY_BREAK;
311 			else if (status & MCFUART_USR_RXPARITY)
312 				flag = TTY_PARITY;
313 			else if (status & MCFUART_USR_RXFRAMING)
314 				flag = TTY_FRAME;
315 		}
316 
317 		if (uart_handle_sysrq_char(port, ch))
318 			continue;
319 		uart_insert_char(port, status, MCFUART_USR_RXOVERRUN, ch, flag);
320 	}
321 
322 	tty_flip_buffer_push(&port->state->port);
323 }
324 
325 /****************************************************************************/
326 
327 static void mcf_tx_chars(struct mcf_uart *pp)
328 {
329 	struct uart_port *port = &pp->port;
330 	struct circ_buf *xmit = &port->state->xmit;
331 
332 	if (port->x_char) {
333 		/* Send special char - probably flow control */
334 		writeb(port->x_char, port->membase + MCFUART_UTB);
335 		port->x_char = 0;
336 		port->icount.tx++;
337 		return;
338 	}
339 
340 	while (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY) {
341 		if (xmit->head == xmit->tail)
342 			break;
343 		writeb(xmit->buf[xmit->tail], port->membase + MCFUART_UTB);
344 		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE -1);
345 		port->icount.tx++;
346 	}
347 
348 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
349 		uart_write_wakeup(port);
350 
351 	if (xmit->head == xmit->tail) {
352 		pp->imr &= ~MCFUART_UIR_TXREADY;
353 		writeb(pp->imr, port->membase + MCFUART_UIMR);
354 		/* Disable TX to negate RTS automatically */
355 		if (port->rs485.flags & SER_RS485_ENABLED)
356 			writeb(MCFUART_UCR_TXDISABLE,
357 				port->membase + MCFUART_UCR);
358 	}
359 }
360 
361 /****************************************************************************/
362 
363 static irqreturn_t mcf_interrupt(int irq, void *data)
364 {
365 	struct uart_port *port = data;
366 	struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
367 	unsigned int isr;
368 	irqreturn_t ret = IRQ_NONE;
369 
370 	isr = readb(port->membase + MCFUART_UISR) & pp->imr;
371 
372 	spin_lock(&port->lock);
373 	if (isr & MCFUART_UIR_RXREADY) {
374 		mcf_rx_chars(pp);
375 		ret = IRQ_HANDLED;
376 	}
377 	if (isr & MCFUART_UIR_TXREADY) {
378 		mcf_tx_chars(pp);
379 		ret = IRQ_HANDLED;
380 	}
381 	spin_unlock(&port->lock);
382 
383 	return ret;
384 }
385 
386 /****************************************************************************/
387 
388 static void mcf_config_port(struct uart_port *port, int flags)
389 {
390 	port->type = PORT_MCF;
391 	port->fifosize = MCFUART_TXFIFOSIZE;
392 
393 	/* Clear mask, so no surprise interrupts. */
394 	writeb(0, port->membase + MCFUART_UIMR);
395 
396 	if (request_irq(port->irq, mcf_interrupt, 0, "UART", port))
397 		printk(KERN_ERR "MCF: unable to attach ColdFire UART %d "
398 			"interrupt vector=%d\n", port->line, port->irq);
399 }
400 
401 /****************************************************************************/
402 
403 static const char *mcf_type(struct uart_port *port)
404 {
405 	return (port->type == PORT_MCF) ? "ColdFire UART" : NULL;
406 }
407 
408 /****************************************************************************/
409 
410 static int mcf_request_port(struct uart_port *port)
411 {
412 	/* UARTs always present */
413 	return 0;
414 }
415 
416 /****************************************************************************/
417 
418 static void mcf_release_port(struct uart_port *port)
419 {
420 	/* Nothing to release... */
421 }
422 
423 /****************************************************************************/
424 
425 static int mcf_verify_port(struct uart_port *port, struct serial_struct *ser)
426 {
427 	if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_MCF))
428 		return -EINVAL;
429 	return 0;
430 }
431 
432 /****************************************************************************/
433 
434 /* Enable or disable the RS485 support */
435 static int mcf_config_rs485(struct uart_port *port, struct serial_rs485 *rs485)
436 {
437 	unsigned char mr1, mr2;
438 
439 	/* Get mode registers */
440 	mr1 = readb(port->membase + MCFUART_UMR);
441 	mr2 = readb(port->membase + MCFUART_UMR);
442 	if (rs485->flags & SER_RS485_ENABLED) {
443 		dev_dbg(port->dev, "Setting UART to RS485\n");
444 		/* Automatically negate RTS after TX completes */
445 		mr2 |= MCFUART_MR2_TXRTS;
446 	} else {
447 		dev_dbg(port->dev, "Setting UART to RS232\n");
448 		mr2 &= ~MCFUART_MR2_TXRTS;
449 	}
450 	writeb(mr1, port->membase + MCFUART_UMR);
451 	writeb(mr2, port->membase + MCFUART_UMR);
452 	port->rs485 = *rs485;
453 
454 	return 0;
455 }
456 
457 /****************************************************************************/
458 
459 /*
460  *	Define the basic serial functions we support.
461  */
462 static const struct uart_ops mcf_uart_ops = {
463 	.tx_empty	= mcf_tx_empty,
464 	.get_mctrl	= mcf_get_mctrl,
465 	.set_mctrl	= mcf_set_mctrl,
466 	.start_tx	= mcf_start_tx,
467 	.stop_tx	= mcf_stop_tx,
468 	.stop_rx	= mcf_stop_rx,
469 	.break_ctl	= mcf_break_ctl,
470 	.startup	= mcf_startup,
471 	.shutdown	= mcf_shutdown,
472 	.set_termios	= mcf_set_termios,
473 	.type		= mcf_type,
474 	.request_port	= mcf_request_port,
475 	.release_port	= mcf_release_port,
476 	.config_port	= mcf_config_port,
477 	.verify_port	= mcf_verify_port,
478 };
479 
480 static struct mcf_uart mcf_ports[4];
481 
482 #define	MCF_MAXPORTS	ARRAY_SIZE(mcf_ports)
483 
484 /****************************************************************************/
485 #if defined(CONFIG_SERIAL_MCF_CONSOLE)
486 /****************************************************************************/
487 
488 int __init early_mcf_setup(struct mcf_platform_uart *platp)
489 {
490 	struct uart_port *port;
491 	int i;
492 
493 	for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) {
494 		port = &mcf_ports[i].port;
495 
496 		port->line = i;
497 		port->type = PORT_MCF;
498 		port->mapbase = platp[i].mapbase;
499 		port->membase = (platp[i].membase) ? platp[i].membase :
500 			(unsigned char __iomem *) port->mapbase;
501 		port->iotype = SERIAL_IO_MEM;
502 		port->irq = platp[i].irq;
503 		port->uartclk = MCF_BUSCLK;
504 		port->flags = UPF_BOOT_AUTOCONF;
505 		port->rs485_config = mcf_config_rs485;
506 		port->ops = &mcf_uart_ops;
507 	}
508 
509 	return 0;
510 }
511 
512 /****************************************************************************/
513 
514 static void mcf_console_putc(struct console *co, const char c)
515 {
516 	struct uart_port *port = &(mcf_ports + co->index)->port;
517 	int i;
518 
519 	for (i = 0; (i < 0x10000); i++) {
520 		if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY)
521 			break;
522 	}
523 	writeb(c, port->membase + MCFUART_UTB);
524 	for (i = 0; (i < 0x10000); i++) {
525 		if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY)
526 			break;
527 	}
528 }
529 
530 /****************************************************************************/
531 
532 static void mcf_console_write(struct console *co, const char *s, unsigned int count)
533 {
534 	for (; (count); count--, s++) {
535 		mcf_console_putc(co, *s);
536 		if (*s == '\n')
537 			mcf_console_putc(co, '\r');
538 	}
539 }
540 
541 /****************************************************************************/
542 
543 static int __init mcf_console_setup(struct console *co, char *options)
544 {
545 	struct uart_port *port;
546 	int baud = CONFIG_SERIAL_MCF_BAUDRATE;
547 	int bits = 8;
548 	int parity = 'n';
549 	int flow = 'n';
550 
551 	if ((co->index < 0) || (co->index >= MCF_MAXPORTS))
552 		co->index = 0;
553 	port = &mcf_ports[co->index].port;
554 	if (port->membase == 0)
555 		return -ENODEV;
556 
557 	if (options)
558 		uart_parse_options(options, &baud, &parity, &bits, &flow);
559 
560 	return uart_set_options(port, co, baud, parity, bits, flow);
561 }
562 
563 /****************************************************************************/
564 
565 static struct uart_driver mcf_driver;
566 
567 static struct console mcf_console = {
568 	.name		= "ttyS",
569 	.write		= mcf_console_write,
570 	.device		= uart_console_device,
571 	.setup		= mcf_console_setup,
572 	.flags		= CON_PRINTBUFFER,
573 	.index		= -1,
574 	.data		= &mcf_driver,
575 };
576 
577 static int __init mcf_console_init(void)
578 {
579 	register_console(&mcf_console);
580 	return 0;
581 }
582 
583 console_initcall(mcf_console_init);
584 
585 #define	MCF_CONSOLE	&mcf_console
586 
587 /****************************************************************************/
588 #else
589 /****************************************************************************/
590 
591 #define	MCF_CONSOLE	NULL
592 
593 /****************************************************************************/
594 #endif /* CONFIG_SERIAL_MCF_CONSOLE */
595 /****************************************************************************/
596 
597 /*
598  *	Define the mcf UART driver structure.
599  */
600 static struct uart_driver mcf_driver = {
601 	.owner		= THIS_MODULE,
602 	.driver_name	= "mcf",
603 	.dev_name	= "ttyS",
604 	.major		= TTY_MAJOR,
605 	.minor		= 64,
606 	.nr		= MCF_MAXPORTS,
607 	.cons		= MCF_CONSOLE,
608 };
609 
610 /****************************************************************************/
611 
612 static int mcf_probe(struct platform_device *pdev)
613 {
614 	struct mcf_platform_uart *platp = dev_get_platdata(&pdev->dev);
615 	struct uart_port *port;
616 	int i;
617 
618 	for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) {
619 		port = &mcf_ports[i].port;
620 
621 		port->line = i;
622 		port->type = PORT_MCF;
623 		port->mapbase = platp[i].mapbase;
624 		port->membase = (platp[i].membase) ? platp[i].membase :
625 			(unsigned char __iomem *) platp[i].mapbase;
626 		port->dev = &pdev->dev;
627 		port->iotype = SERIAL_IO_MEM;
628 		port->irq = platp[i].irq;
629 		port->uartclk = MCF_BUSCLK;
630 		port->ops = &mcf_uart_ops;
631 		port->flags = UPF_BOOT_AUTOCONF;
632 		port->rs485_config = mcf_config_rs485;
633 		port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_MCF_CONSOLE);
634 
635 		uart_add_one_port(&mcf_driver, port);
636 	}
637 
638 	return 0;
639 }
640 
641 /****************************************************************************/
642 
643 static int mcf_remove(struct platform_device *pdev)
644 {
645 	struct uart_port *port;
646 	int i;
647 
648 	for (i = 0; (i < MCF_MAXPORTS); i++) {
649 		port = &mcf_ports[i].port;
650 		if (port)
651 			uart_remove_one_port(&mcf_driver, port);
652 	}
653 
654 	return 0;
655 }
656 
657 /****************************************************************************/
658 
659 static struct platform_driver mcf_platform_driver = {
660 	.probe		= mcf_probe,
661 	.remove		= mcf_remove,
662 	.driver		= {
663 		.name	= "mcfuart",
664 	},
665 };
666 
667 /****************************************************************************/
668 
669 static int __init mcf_init(void)
670 {
671 	int rc;
672 
673 	printk("ColdFire internal UART serial driver\n");
674 
675 	rc = uart_register_driver(&mcf_driver);
676 	if (rc)
677 		return rc;
678 	rc = platform_driver_register(&mcf_platform_driver);
679 	if (rc) {
680 		uart_unregister_driver(&mcf_driver);
681 		return rc;
682 	}
683 	return 0;
684 }
685 
686 /****************************************************************************/
687 
688 static void __exit mcf_exit(void)
689 {
690 	platform_driver_unregister(&mcf_platform_driver);
691 	uart_unregister_driver(&mcf_driver);
692 }
693 
694 /****************************************************************************/
695 
696 module_init(mcf_init);
697 module_exit(mcf_exit);
698 
699 MODULE_AUTHOR("Greg Ungerer <gerg@uclinux.org>");
700 MODULE_DESCRIPTION("Freescale ColdFire UART driver");
701 MODULE_LICENSE("GPL");
702 MODULE_ALIAS("platform:mcfuart");
703 
704 /****************************************************************************/
705