xref: /linux/drivers/tty/serial/altera_uart.c (revision 7a9b709e7cc5ce1ffb84ce07bf6d157e1de758df) 
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * altera_uart.c -- Altera UART driver
4  *
5  * Based on mcf.c -- Freescale ColdFire UART driver
6  *
7  * (C) Copyright 2003-2007, Greg Ungerer <gerg@snapgear.com>
8  * (C) Copyright 2008, Thomas Chou <thomas@wytron.com.tw>
9  * (C) Copyright 2010, Tobias Klauser <tklauser@distanz.ch>
10  */
11 
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/timer.h>
15 #include <linux/interrupt.h>
16 #include <linux/module.h>
17 #include <linux/console.h>
18 #include <linux/tty.h>
19 #include <linux/tty_flip.h>
20 #include <linux/serial.h>
21 #include <linux/serial_core.h>
22 #include <linux/platform_device.h>
23 #include <linux/of.h>
24 #include <linux/io.h>
25 #include <linux/altera_uart.h>
26 
27 #define SERIAL_ALTERA_MAJOR 204
28 #define SERIAL_ALTERA_MINOR 213
29 
30 /*
31  * Altera UART register definitions according to the Nios UART datasheet:
32  * http://www.altera.com/literature/ds/ds_nios_uart.pdf
33  */
34 
35 #define ALTERA_UART_SIZE		32
36 
37 #define ALTERA_UART_RXDATA_REG		0
38 #define ALTERA_UART_TXDATA_REG		4
39 #define ALTERA_UART_STATUS_REG		8
40 #define ALTERA_UART_CONTROL_REG		12
41 #define ALTERA_UART_DIVISOR_REG		16
42 #define ALTERA_UART_EOP_REG		20
43 
44 #define ALTERA_UART_STATUS_PE_MSK	0x0001	/* parity error */
45 #define ALTERA_UART_STATUS_FE_MSK	0x0002	/* framing error */
46 #define ALTERA_UART_STATUS_BRK_MSK	0x0004	/* break */
47 #define ALTERA_UART_STATUS_ROE_MSK	0x0008	/* RX overrun error */
48 #define ALTERA_UART_STATUS_TOE_MSK	0x0010	/* TX overrun error */
49 #define ALTERA_UART_STATUS_TMT_MSK	0x0020	/* TX shift register state */
50 #define ALTERA_UART_STATUS_TRDY_MSK	0x0040	/* TX ready */
51 #define ALTERA_UART_STATUS_RRDY_MSK	0x0080	/* RX ready */
52 #define ALTERA_UART_STATUS_E_MSK	0x0100	/* exception condition */
53 #define ALTERA_UART_STATUS_DCTS_MSK	0x0400	/* CTS logic-level change */
54 #define ALTERA_UART_STATUS_CTS_MSK	0x0800	/* CTS logic state */
55 #define ALTERA_UART_STATUS_EOP_MSK	0x1000	/* EOP written/read */
56 
57 						/* Enable interrupt on... */
58 #define ALTERA_UART_CONTROL_PE_MSK	0x0001	/* ...parity error */
59 #define ALTERA_UART_CONTROL_FE_MSK	0x0002	/* ...framing error */
60 #define ALTERA_UART_CONTROL_BRK_MSK	0x0004	/* ...break */
61 #define ALTERA_UART_CONTROL_ROE_MSK	0x0008	/* ...RX overrun */
62 #define ALTERA_UART_CONTROL_TOE_MSK	0x0010	/* ...TX overrun */
63 #define ALTERA_UART_CONTROL_TMT_MSK	0x0020	/* ...TX shift register empty */
64 #define ALTERA_UART_CONTROL_TRDY_MSK	0x0040	/* ...TX ready */
65 #define ALTERA_UART_CONTROL_RRDY_MSK	0x0080	/* ...RX ready */
66 #define ALTERA_UART_CONTROL_E_MSK	0x0100	/* ...exception*/
67 
68 #define ALTERA_UART_CONTROL_TRBK_MSK	0x0200	/* TX break */
69 #define ALTERA_UART_CONTROL_DCTS_MSK	0x0400	/* Interrupt on CTS change */
70 #define ALTERA_UART_CONTROL_RTS_MSK	0x0800	/* RTS signal */
71 #define ALTERA_UART_CONTROL_EOP_MSK	0x1000	/* Interrupt on EOP */
72 
73 /*
74  * Local per-uart structure.
75  */
76 struct altera_uart {
77 	struct uart_port port;
78 	struct timer_list tmr;
79 	unsigned int sigs;	/* Local copy of line sigs */
80 	unsigned short imr;	/* Local IMR mirror */
81 };
82 
83 static u32 altera_uart_readl(struct uart_port *port, int reg)
84 {
85 	return readl(port->membase + (reg << port->regshift));
86 }
87 
88 static void altera_uart_writel(struct uart_port *port, u32 dat, int reg)
89 {
90 	writel(dat, port->membase + (reg << port->regshift));
91 }
92 
93 static unsigned int altera_uart_tx_empty(struct uart_port *port)
94 {
95 	return (altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
96 		ALTERA_UART_STATUS_TMT_MSK) ? TIOCSER_TEMT : 0;
97 }
98 
99 static unsigned int altera_uart_get_mctrl(struct uart_port *port)
100 {
101 	struct altera_uart *pp = container_of(port, struct altera_uart, port);
102 	unsigned int sigs;
103 
104 	sigs = (altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
105 	     ALTERA_UART_STATUS_CTS_MSK) ? TIOCM_CTS : 0;
106 	sigs |= (pp->sigs & TIOCM_RTS);
107 
108 	return sigs;
109 }
110 
111 static void altera_uart_update_ctrl_reg(struct altera_uart *pp)
112 {
113 	unsigned short imr = pp->imr;
114 
115 	/*
116 	 * If the device doesn't have an irq, ensure that the irq bits are
117 	 * masked out to keep the irq line inactive.
118 	 */
119 	if (!pp->port.irq)
120 		imr &= ALTERA_UART_CONTROL_TRBK_MSK | ALTERA_UART_CONTROL_RTS_MSK;
121 
122 	altera_uart_writel(&pp->port, imr, ALTERA_UART_CONTROL_REG);
123 }
124 
125 static void altera_uart_set_mctrl(struct uart_port *port, unsigned int sigs)
126 {
127 	struct altera_uart *pp = container_of(port, struct altera_uart, port);
128 
129 	pp->sigs = sigs;
130 	if (sigs & TIOCM_RTS)
131 		pp->imr |= ALTERA_UART_CONTROL_RTS_MSK;
132 	else
133 		pp->imr &= ~ALTERA_UART_CONTROL_RTS_MSK;
134 	altera_uart_update_ctrl_reg(pp);
135 }
136 
137 static void altera_uart_start_tx(struct uart_port *port)
138 {
139 	struct altera_uart *pp = container_of(port, struct altera_uart, port);
140 
141 	pp->imr |= ALTERA_UART_CONTROL_TRDY_MSK;
142 	altera_uart_update_ctrl_reg(pp);
143 }
144 
145 static void altera_uart_stop_tx(struct uart_port *port)
146 {
147 	struct altera_uart *pp = container_of(port, struct altera_uart, port);
148 
149 	pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK;
150 	altera_uart_update_ctrl_reg(pp);
151 }
152 
153 static void altera_uart_stop_rx(struct uart_port *port)
154 {
155 	struct altera_uart *pp = container_of(port, struct altera_uart, port);
156 
157 	pp->imr &= ~ALTERA_UART_CONTROL_RRDY_MSK;
158 	altera_uart_update_ctrl_reg(pp);
159 }
160 
161 static void altera_uart_break_ctl(struct uart_port *port, int break_state)
162 {
163 	struct altera_uart *pp = container_of(port, struct altera_uart, port);
164 	unsigned long flags;
165 
166 	uart_port_lock_irqsave(port, &flags);
167 	if (break_state == -1)
168 		pp->imr |= ALTERA_UART_CONTROL_TRBK_MSK;
169 	else
170 		pp->imr &= ~ALTERA_UART_CONTROL_TRBK_MSK;
171 	altera_uart_update_ctrl_reg(pp);
172 	uart_port_unlock_irqrestore(port, flags);
173 }
174 
175 static void altera_uart_set_termios(struct uart_port *port,
176 				    struct ktermios *termios,
177 				    const struct ktermios *old)
178 {
179 	unsigned long flags;
180 	unsigned int baud, baudclk;
181 
182 	baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
183 	baudclk = port->uartclk / baud;
184 
185 	if (old)
186 		tty_termios_copy_hw(termios, old);
187 	tty_termios_encode_baud_rate(termios, baud, baud);
188 
189 	uart_port_lock_irqsave(port, &flags);
190 	uart_update_timeout(port, termios->c_cflag, baud);
191 	altera_uart_writel(port, baudclk, ALTERA_UART_DIVISOR_REG);
192 	uart_port_unlock_irqrestore(port, flags);
193 
194 	/*
195 	 * FIXME: port->read_status_mask and port->ignore_status_mask
196 	 * need to be initialized based on termios settings for
197 	 * INPCK, IGNBRK, IGNPAR, PARMRK, BRKINT
198 	 */
199 }
200 
201 static void altera_uart_rx_chars(struct uart_port *port)
202 {
203 	unsigned short status;
204 	u8 ch, flag;
205 
206 	while ((status = altera_uart_readl(port, ALTERA_UART_STATUS_REG)) &
207 	       ALTERA_UART_STATUS_RRDY_MSK) {
208 		ch = altera_uart_readl(port, ALTERA_UART_RXDATA_REG);
209 		flag = TTY_NORMAL;
210 		port->icount.rx++;
211 
212 		if (status & ALTERA_UART_STATUS_E_MSK) {
213 			altera_uart_writel(port, status,
214 					   ALTERA_UART_STATUS_REG);
215 
216 			if (status & ALTERA_UART_STATUS_BRK_MSK) {
217 				port->icount.brk++;
218 				if (uart_handle_break(port))
219 					continue;
220 			} else if (status & ALTERA_UART_STATUS_PE_MSK) {
221 				port->icount.parity++;
222 			} else if (status & ALTERA_UART_STATUS_ROE_MSK) {
223 				port->icount.overrun++;
224 			} else if (status & ALTERA_UART_STATUS_FE_MSK) {
225 				port->icount.frame++;
226 			}
227 
228 			status &= port->read_status_mask;
229 
230 			if (status & ALTERA_UART_STATUS_BRK_MSK)
231 				flag = TTY_BREAK;
232 			else if (status & ALTERA_UART_STATUS_PE_MSK)
233 				flag = TTY_PARITY;
234 			else if (status & ALTERA_UART_STATUS_FE_MSK)
235 				flag = TTY_FRAME;
236 		}
237 
238 		if (uart_handle_sysrq_char(port, ch))
239 			continue;
240 		uart_insert_char(port, status, ALTERA_UART_STATUS_ROE_MSK, ch,
241 				 flag);
242 	}
243 
244 	tty_flip_buffer_push(&port->state->port);
245 }
246 
247 static void altera_uart_tx_chars(struct uart_port *port)
248 {
249 	u8 ch;
250 
251 	uart_port_tx(port, ch,
252 		altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
253 		                ALTERA_UART_STATUS_TRDY_MSK,
254 		altera_uart_writel(port, ch, ALTERA_UART_TXDATA_REG));
255 }
256 
257 static irqreturn_t altera_uart_interrupt(int irq, void *data)
258 {
259 	struct uart_port *port = data;
260 	struct altera_uart *pp = container_of(port, struct altera_uart, port);
261 	unsigned long flags;
262 	unsigned int isr;
263 
264 	isr = altera_uart_readl(port, ALTERA_UART_STATUS_REG) & pp->imr;
265 
266 	uart_port_lock_irqsave(port, &flags);
267 	if (isr & ALTERA_UART_STATUS_RRDY_MSK)
268 		altera_uart_rx_chars(port);
269 	if (isr & ALTERA_UART_STATUS_TRDY_MSK)
270 		altera_uart_tx_chars(port);
271 	uart_port_unlock_irqrestore(port, flags);
272 
273 	return IRQ_RETVAL(isr);
274 }
275 
276 static void altera_uart_timer(struct timer_list *t)
277 {
278 	struct altera_uart *pp = from_timer(pp, t, tmr);
279 	struct uart_port *port = &pp->port;
280 
281 	altera_uart_interrupt(0, port);
282 	mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
283 }
284 
285 static void altera_uart_config_port(struct uart_port *port, int flags)
286 {
287 	port->type = PORT_ALTERA_UART;
288 
289 	/* Clear mask, so no surprise interrupts. */
290 	altera_uart_writel(port, 0, ALTERA_UART_CONTROL_REG);
291 	/* Clear status register */
292 	altera_uart_writel(port, 0, ALTERA_UART_STATUS_REG);
293 }
294 
295 static int altera_uart_startup(struct uart_port *port)
296 {
297 	struct altera_uart *pp = container_of(port, struct altera_uart, port);
298 	unsigned long flags;
299 
300 	if (!port->irq) {
301 		timer_setup(&pp->tmr, altera_uart_timer, 0);
302 		mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
303 	} else {
304 		int ret;
305 
306 		ret = request_irq(port->irq, altera_uart_interrupt, 0,
307 				dev_name(port->dev), port);
308 		if (ret) {
309 			dev_err(port->dev, "unable to attach Altera UART %d interrupt vector=%d\n",
310 				port->line, port->irq);
311 			return ret;
312 		}
313 	}
314 
315 	uart_port_lock_irqsave(port, &flags);
316 
317 	/* Enable RX interrupts now */
318 	pp->imr = ALTERA_UART_CONTROL_RRDY_MSK;
319 	altera_uart_update_ctrl_reg(pp);
320 
321 	uart_port_unlock_irqrestore(port, flags);
322 
323 	return 0;
324 }
325 
326 static void altera_uart_shutdown(struct uart_port *port)
327 {
328 	struct altera_uart *pp = container_of(port, struct altera_uart, port);
329 	unsigned long flags;
330 
331 	uart_port_lock_irqsave(port, &flags);
332 
333 	/* Disable all interrupts now */
334 	pp->imr = 0;
335 	altera_uart_update_ctrl_reg(pp);
336 
337 	uart_port_unlock_irqrestore(port, flags);
338 
339 	if (port->irq)
340 		free_irq(port->irq, port);
341 	else
342 		timer_delete_sync(&pp->tmr);
343 }
344 
345 static const char *altera_uart_type(struct uart_port *port)
346 {
347 	return (port->type == PORT_ALTERA_UART) ? "Altera UART" : NULL;
348 }
349 
350 static int altera_uart_request_port(struct uart_port *port)
351 {
352 	/* UARTs always present */
353 	return 0;
354 }
355 
356 static void altera_uart_release_port(struct uart_port *port)
357 {
358 	/* Nothing to release... */
359 }
360 
361 static int altera_uart_verify_port(struct uart_port *port,
362 				   struct serial_struct *ser)
363 {
364 	if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_ALTERA_UART))
365 		return -EINVAL;
366 	return 0;
367 }
368 
369 #ifdef CONFIG_CONSOLE_POLL
370 static int altera_uart_poll_get_char(struct uart_port *port)
371 {
372 	while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
373 		 ALTERA_UART_STATUS_RRDY_MSK))
374 		cpu_relax();
375 
376 	return altera_uart_readl(port, ALTERA_UART_RXDATA_REG);
377 }
378 
379 static void altera_uart_poll_put_char(struct uart_port *port, unsigned char c)
380 {
381 	while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
382 		 ALTERA_UART_STATUS_TRDY_MSK))
383 		cpu_relax();
384 
385 	altera_uart_writel(port, c, ALTERA_UART_TXDATA_REG);
386 }
387 #endif
388 
389 /*
390  *	Define the basic serial functions we support.
391  */
392 static const struct uart_ops altera_uart_ops = {
393 	.tx_empty	= altera_uart_tx_empty,
394 	.get_mctrl	= altera_uart_get_mctrl,
395 	.set_mctrl	= altera_uart_set_mctrl,
396 	.start_tx	= altera_uart_start_tx,
397 	.stop_tx	= altera_uart_stop_tx,
398 	.stop_rx	= altera_uart_stop_rx,
399 	.break_ctl	= altera_uart_break_ctl,
400 	.startup	= altera_uart_startup,
401 	.shutdown	= altera_uart_shutdown,
402 	.set_termios	= altera_uart_set_termios,
403 	.type		= altera_uart_type,
404 	.request_port	= altera_uart_request_port,
405 	.release_port	= altera_uart_release_port,
406 	.config_port	= altera_uart_config_port,
407 	.verify_port	= altera_uart_verify_port,
408 #ifdef CONFIG_CONSOLE_POLL
409 	.poll_get_char	= altera_uart_poll_get_char,
410 	.poll_put_char	= altera_uart_poll_put_char,
411 #endif
412 };
413 
414 static struct altera_uart altera_uart_ports[CONFIG_SERIAL_ALTERA_UART_MAXPORTS];
415 
416 #if defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE)
417 
418 static void altera_uart_console_putc(struct uart_port *port, unsigned char c)
419 {
420 	while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
421 		 ALTERA_UART_STATUS_TRDY_MSK))
422 		cpu_relax();
423 
424 	altera_uart_writel(port, c, ALTERA_UART_TXDATA_REG);
425 }
426 
427 static void altera_uart_console_write(struct console *co, const char *s,
428 				      unsigned int count)
429 {
430 	struct uart_port *port = &(altera_uart_ports + co->index)->port;
431 
432 	uart_console_write(port, s, count, altera_uart_console_putc);
433 }
434 
435 static int __init altera_uart_console_setup(struct console *co, char *options)
436 {
437 	struct uart_port *port;
438 	int baud = CONFIG_SERIAL_ALTERA_UART_BAUDRATE;
439 	int bits = 8;
440 	int parity = 'n';
441 	int flow = 'n';
442 
443 	if (co->index < 0 || co->index >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS)
444 		return -EINVAL;
445 	port = &altera_uart_ports[co->index].port;
446 	if (!port->membase)
447 		return -ENODEV;
448 
449 	if (options)
450 		uart_parse_options(options, &baud, &parity, &bits, &flow);
451 
452 	return uart_set_options(port, co, baud, parity, bits, flow);
453 }
454 
455 static struct uart_driver altera_uart_driver;
456 
457 static struct console altera_uart_console = {
458 	.name	= "ttyAL",
459 	.write	= altera_uart_console_write,
460 	.device	= uart_console_device,
461 	.setup	= altera_uart_console_setup,
462 	.flags	= CON_PRINTBUFFER,
463 	.index	= -1,
464 	.data	= &altera_uart_driver,
465 };
466 
467 static int __init altera_uart_console_init(void)
468 {
469 	register_console(&altera_uart_console);
470 	return 0;
471 }
472 
473 console_initcall(altera_uart_console_init);
474 
475 #define	ALTERA_UART_CONSOLE	(&altera_uart_console)
476 
477 static void altera_uart_earlycon_write(struct console *co, const char *s,
478 				       unsigned int count)
479 {
480 	struct earlycon_device *dev = co->data;
481 
482 	uart_console_write(&dev->port, s, count, altera_uart_console_putc);
483 }
484 
485 static int __init altera_uart_earlycon_setup(struct earlycon_device *dev,
486 					     const char *options)
487 {
488 	struct uart_port *port = &dev->port;
489 
490 	if (!port->membase)
491 		return -ENODEV;
492 
493 	/* Enable RX interrupts now */
494 	altera_uart_writel(port, ALTERA_UART_CONTROL_RRDY_MSK,
495 			   ALTERA_UART_CONTROL_REG);
496 
497 	if (dev->baud) {
498 		unsigned int baudclk = port->uartclk / dev->baud;
499 
500 		altera_uart_writel(port, baudclk, ALTERA_UART_DIVISOR_REG);
501 	}
502 
503 	dev->con->write = altera_uart_earlycon_write;
504 	return 0;
505 }
506 
507 OF_EARLYCON_DECLARE(uart, "altr,uart-1.0", altera_uart_earlycon_setup);
508 
509 #else
510 
511 #define	ALTERA_UART_CONSOLE	NULL
512 
513 #endif /* CONFIG_SERIAL_ALTERA_UART_CONSOLE */
514 
515 /*
516  *	Define the altera_uart UART driver structure.
517  */
518 static struct uart_driver altera_uart_driver = {
519 	.owner		= THIS_MODULE,
520 	.driver_name	= KBUILD_MODNAME,
521 	.dev_name	= "ttyAL",
522 	.major		= SERIAL_ALTERA_MAJOR,
523 	.minor		= SERIAL_ALTERA_MINOR,
524 	.nr		= CONFIG_SERIAL_ALTERA_UART_MAXPORTS,
525 	.cons		= ALTERA_UART_CONSOLE,
526 };
527 
528 static int altera_uart_probe(struct platform_device *pdev)
529 {
530 	struct altera_uart_platform_uart *platp = dev_get_platdata(&pdev->dev);
531 	struct uart_port *port;
532 	struct resource *res_mem;
533 	int i = pdev->id;
534 	int ret;
535 
536 	/* if id is -1 scan for a free id and use that one */
537 	if (i == -1) {
538 		for (i = 0; i < CONFIG_SERIAL_ALTERA_UART_MAXPORTS; i++)
539 			if (altera_uart_ports[i].port.mapbase == 0)
540 				break;
541 	}
542 
543 	if (i < 0 || i >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS)
544 		return -EINVAL;
545 
546 	port = &altera_uart_ports[i].port;
547 
548 	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
549 	if (res_mem)
550 		port->mapbase = res_mem->start;
551 	else if (platp)
552 		port->mapbase = platp->mapbase;
553 	else
554 		return -EINVAL;
555 
556 	ret = platform_get_irq_optional(pdev, 0);
557 	if (ret < 0 && ret != -ENXIO)
558 		return ret;
559 	if (ret > 0)
560 		port->irq = ret;
561 	else if (platp)
562 		port->irq = platp->irq;
563 
564 	/* Check platform data first so we can override device node data */
565 	if (platp)
566 		port->uartclk = platp->uartclk;
567 	else {
568 		ret = of_property_read_u32(pdev->dev.of_node, "clock-frequency",
569 					   &port->uartclk);
570 		if (ret)
571 			return ret;
572 	}
573 
574 	port->membase = ioremap(port->mapbase, ALTERA_UART_SIZE);
575 	if (!port->membase)
576 		return -ENOMEM;
577 
578 	if (platp)
579 		port->regshift = platp->bus_shift;
580 	else
581 		port->regshift = 0;
582 
583 	port->line = i;
584 	port->type = PORT_ALTERA_UART;
585 	port->iotype = SERIAL_IO_MEM;
586 	port->ops = &altera_uart_ops;
587 	port->flags = UPF_BOOT_AUTOCONF;
588 	port->dev = &pdev->dev;
589 
590 	platform_set_drvdata(pdev, port);
591 
592 	uart_add_one_port(&altera_uart_driver, port);
593 
594 	return 0;
595 }
596 
597 static void altera_uart_remove(struct platform_device *pdev)
598 {
599 	struct uart_port *port = platform_get_drvdata(pdev);
600 
601 	if (port) {
602 		uart_remove_one_port(&altera_uart_driver, port);
603 		port->mapbase = 0;
604 		iounmap(port->membase);
605 	}
606 }
607 
608 #ifdef CONFIG_OF
609 static const struct of_device_id altera_uart_match[] = {
610 	{ .compatible = "ALTR,uart-1.0", },
611 	{ .compatible = "altr,uart-1.0", },
612 	{},
613 };
614 MODULE_DEVICE_TABLE(of, altera_uart_match);
615 #endif /* CONFIG_OF */
616 
617 static struct platform_driver altera_uart_platform_driver = {
618 	.probe	= altera_uart_probe,
619 	.remove = altera_uart_remove,
620 	.driver	= {
621 		.name		= KBUILD_MODNAME,
622 		.of_match_table	= of_match_ptr(altera_uart_match),
623 	},
624 };
625 
626 static int __init altera_uart_init(void)
627 {
628 	int rc;
629 
630 	rc = uart_register_driver(&altera_uart_driver);
631 	if (rc)
632 		return rc;
633 	rc = platform_driver_register(&altera_uart_platform_driver);
634 	if (rc)
635 		uart_unregister_driver(&altera_uart_driver);
636 	return rc;
637 }
638 
639 static void __exit altera_uart_exit(void)
640 {
641 	platform_driver_unregister(&altera_uart_platform_driver);
642 	uart_unregister_driver(&altera_uart_driver);
643 }
644 
645 module_init(altera_uart_init);
646 module_exit(altera_uart_exit);
647 
648 MODULE_DESCRIPTION("Altera UART driver");
649 MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
650 MODULE_LICENSE("GPL");
651 MODULE_ALIAS("platform:" KBUILD_MODNAME);
652 MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_ALTERA_MAJOR);
653