xref: /openbmc/linux/drivers/tty/serial/lantiq.c (revision e0f52298)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
4  *
5  * Copyright (C) 2004 Infineon IFAP DC COM CPE
6  * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
7  * Copyright (C) 2007 John Crispin <john@phrozen.org>
8  * Copyright (C) 2010 Thomas Langer, <thomas.langer@lantiq.com>
9  */
10 
11 #include <linux/bitfield.h>
12 #include <linux/clk.h>
13 #include <linux/console.h>
14 #include <linux/device.h>
15 #include <linux/init.h>
16 #include <linux/io.h>
17 #include <linux/ioport.h>
18 #include <linux/lantiq.h>
19 #include <linux/module.h>
20 #include <linux/of_platform.h>
21 #include <linux/serial.h>
22 #include <linux/serial_core.h>
23 #include <linux/slab.h>
24 #include <linux/sysrq.h>
25 #include <linux/tty.h>
26 #include <linux/tty_flip.h>
27 
28 #define PORT_LTQ_ASC		111
29 #define MAXPORTS		2
30 #define UART_DUMMY_UER_RX	1
31 #define DRVNAME			"lantiq,asc"
32 #ifdef __BIG_ENDIAN
33 #define LTQ_ASC_TBUF		(0x0020 + 3)
34 #define LTQ_ASC_RBUF		(0x0024 + 3)
35 #else
36 #define LTQ_ASC_TBUF		0x0020
37 #define LTQ_ASC_RBUF		0x0024
38 #endif
39 #define LTQ_ASC_FSTAT		0x0048
40 #define LTQ_ASC_WHBSTATE	0x0018
41 #define LTQ_ASC_STATE		0x0014
42 #define LTQ_ASC_IRNCR		0x00F8
43 #define LTQ_ASC_CLC		0x0000
44 #define LTQ_ASC_ID		0x0008
45 #define LTQ_ASC_PISEL		0x0004
46 #define LTQ_ASC_TXFCON		0x0044
47 #define LTQ_ASC_RXFCON		0x0040
48 #define LTQ_ASC_CON		0x0010
49 #define LTQ_ASC_BG		0x0050
50 #define LTQ_ASC_IRNREN		0x00F4
51 
52 #define ASC_IRNREN_TX		0x1
53 #define ASC_IRNREN_RX		0x2
54 #define ASC_IRNREN_ERR		0x4
55 #define ASC_IRNREN_TX_BUF	0x8
56 #define ASC_IRNCR_TIR		0x1
57 #define ASC_IRNCR_RIR		0x2
58 #define ASC_IRNCR_EIR		0x4
59 #define ASC_IRNCR_MASK		GENMASK(2, 0)
60 
61 #define ASCOPT_CSIZE		0x3
62 #define TXFIFO_FL		1
63 #define RXFIFO_FL		1
64 #define ASCCLC_DISS		0x2
65 #define ASCCLC_RMCMASK		0x0000FF00
66 #define ASCCLC_RMCOFFSET	8
67 #define ASCCON_M_8ASYNC		0x0
68 #define ASCCON_M_7ASYNC		0x2
69 #define ASCCON_ODD		0x00000020
70 #define ASCCON_STP		0x00000080
71 #define ASCCON_BRS		0x00000100
72 #define ASCCON_FDE		0x00000200
73 #define ASCCON_R		0x00008000
74 #define ASCCON_FEN		0x00020000
75 #define ASCCON_ROEN		0x00080000
76 #define ASCCON_TOEN		0x00100000
77 #define ASCSTATE_PE		0x00010000
78 #define ASCSTATE_FE		0x00020000
79 #define ASCSTATE_ROE		0x00080000
80 #define ASCSTATE_ANY		(ASCSTATE_ROE|ASCSTATE_PE|ASCSTATE_FE)
81 #define ASCWHBSTATE_CLRREN	0x00000001
82 #define ASCWHBSTATE_SETREN	0x00000002
83 #define ASCWHBSTATE_CLRPE	0x00000004
84 #define ASCWHBSTATE_CLRFE	0x00000008
85 #define ASCWHBSTATE_CLRROE	0x00000020
86 #define ASCTXFCON_TXFEN		0x0001
87 #define ASCTXFCON_TXFFLU	0x0002
88 #define ASCTXFCON_TXFITLMASK	0x3F00
89 #define ASCTXFCON_TXFITLOFF	8
90 #define ASCRXFCON_RXFEN		0x0001
91 #define ASCRXFCON_RXFFLU	0x0002
92 #define ASCRXFCON_RXFITLMASK	0x3F00
93 #define ASCRXFCON_RXFITLOFF	8
94 #define ASCFSTAT_RXFFLMASK	0x003F
95 #define ASCFSTAT_TXFFLMASK	0x3F00
96 #define ASCFSTAT_TXFREEMASK	0x3F000000
97 
98 static struct ltq_uart_port *lqasc_port[MAXPORTS];
99 static struct uart_driver lqasc_reg;
100 
101 struct ltq_soc_data {
102 	int	(*fetch_irq)(struct device *dev, struct ltq_uart_port *ltq_port);
103 	int	(*request_irq)(struct uart_port *port);
104 	void	(*free_irq)(struct uart_port *port);
105 };
106 
107 struct ltq_uart_port {
108 	struct uart_port	port;
109 	/* clock used to derive divider */
110 	struct clk		*freqclk;
111 	/* clock gating of the ASC core */
112 	struct clk		*clk;
113 	unsigned int		tx_irq;
114 	unsigned int		rx_irq;
115 	unsigned int		err_irq;
116 	unsigned int		common_irq;
117 	spinlock_t		lock; /* exclusive access for multi core */
118 
119 	const struct ltq_soc_data	*soc;
120 };
121 
122 static inline void asc_update_bits(u32 clear, u32 set, void __iomem *reg)
123 {
124 	u32 tmp = __raw_readl(reg);
125 
126 	__raw_writel((tmp & ~clear) | set, reg);
127 }
128 
129 static inline struct
130 ltq_uart_port *to_ltq_uart_port(struct uart_port *port)
131 {
132 	return container_of(port, struct ltq_uart_port, port);
133 }
134 
135 static void
136 lqasc_stop_tx(struct uart_port *port)
137 {
138 	return;
139 }
140 
141 static bool lqasc_tx_ready(struct uart_port *port)
142 {
143 	u32 fstat = __raw_readl(port->membase + LTQ_ASC_FSTAT);
144 
145 	return FIELD_GET(ASCFSTAT_TXFREEMASK, fstat);
146 }
147 
148 static void
149 lqasc_start_tx(struct uart_port *port)
150 {
151 	unsigned long flags;
152 	struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
153 	u8 ch;
154 
155 	spin_lock_irqsave(&ltq_port->lock, flags);
156 	uart_port_tx(port, ch,
157 		lqasc_tx_ready(port),
158 		writeb(ch, port->membase + LTQ_ASC_TBUF));
159 	spin_unlock_irqrestore(&ltq_port->lock, flags);
160 	return;
161 }
162 
163 static void
164 lqasc_stop_rx(struct uart_port *port)
165 {
166 	__raw_writel(ASCWHBSTATE_CLRREN, port->membase + LTQ_ASC_WHBSTATE);
167 }
168 
169 static int
170 lqasc_rx_chars(struct uart_port *port)
171 {
172 	struct tty_port *tport = &port->state->port;
173 	unsigned int ch = 0, rsr = 0, fifocnt;
174 
175 	fifocnt = __raw_readl(port->membase + LTQ_ASC_FSTAT) &
176 		  ASCFSTAT_RXFFLMASK;
177 	while (fifocnt--) {
178 		u8 flag = TTY_NORMAL;
179 		ch = readb(port->membase + LTQ_ASC_RBUF);
180 		rsr = (__raw_readl(port->membase + LTQ_ASC_STATE)
181 			& ASCSTATE_ANY) | UART_DUMMY_UER_RX;
182 		tty_flip_buffer_push(tport);
183 		port->icount.rx++;
184 
185 		/*
186 		 * Note that the error handling code is
187 		 * out of the main execution path
188 		 */
189 		if (rsr & ASCSTATE_ANY) {
190 			if (rsr & ASCSTATE_PE) {
191 				port->icount.parity++;
192 				asc_update_bits(0, ASCWHBSTATE_CLRPE,
193 					port->membase + LTQ_ASC_WHBSTATE);
194 			} else if (rsr & ASCSTATE_FE) {
195 				port->icount.frame++;
196 				asc_update_bits(0, ASCWHBSTATE_CLRFE,
197 					port->membase + LTQ_ASC_WHBSTATE);
198 			}
199 			if (rsr & ASCSTATE_ROE) {
200 				port->icount.overrun++;
201 				asc_update_bits(0, ASCWHBSTATE_CLRROE,
202 					port->membase + LTQ_ASC_WHBSTATE);
203 			}
204 
205 			rsr &= port->read_status_mask;
206 
207 			if (rsr & ASCSTATE_PE)
208 				flag = TTY_PARITY;
209 			else if (rsr & ASCSTATE_FE)
210 				flag = TTY_FRAME;
211 		}
212 
213 		if ((rsr & port->ignore_status_mask) == 0)
214 			tty_insert_flip_char(tport, ch, flag);
215 
216 		if (rsr & ASCSTATE_ROE)
217 			/*
218 			 * Overrun is special, since it's reported
219 			 * immediately, and doesn't affect the current
220 			 * character
221 			 */
222 			tty_insert_flip_char(tport, 0, TTY_OVERRUN);
223 	}
224 
225 	if (ch != 0)
226 		tty_flip_buffer_push(tport);
227 
228 	return 0;
229 }
230 
231 static irqreturn_t
232 lqasc_tx_int(int irq, void *_port)
233 {
234 	unsigned long flags;
235 	struct uart_port *port = (struct uart_port *)_port;
236 	struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
237 
238 	spin_lock_irqsave(&ltq_port->lock, flags);
239 	__raw_writel(ASC_IRNCR_TIR, port->membase + LTQ_ASC_IRNCR);
240 	spin_unlock_irqrestore(&ltq_port->lock, flags);
241 	lqasc_start_tx(port);
242 	return IRQ_HANDLED;
243 }
244 
245 static irqreturn_t
246 lqasc_err_int(int irq, void *_port)
247 {
248 	unsigned long flags;
249 	struct uart_port *port = (struct uart_port *)_port;
250 	struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
251 
252 	spin_lock_irqsave(&ltq_port->lock, flags);
253 	__raw_writel(ASC_IRNCR_EIR, port->membase + LTQ_ASC_IRNCR);
254 	/* clear any pending interrupts */
255 	asc_update_bits(0, ASCWHBSTATE_CLRPE | ASCWHBSTATE_CLRFE |
256 		ASCWHBSTATE_CLRROE, port->membase + LTQ_ASC_WHBSTATE);
257 	spin_unlock_irqrestore(&ltq_port->lock, flags);
258 	return IRQ_HANDLED;
259 }
260 
261 static irqreturn_t
262 lqasc_rx_int(int irq, void *_port)
263 {
264 	unsigned long flags;
265 	struct uart_port *port = (struct uart_port *)_port;
266 	struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
267 
268 	spin_lock_irqsave(&ltq_port->lock, flags);
269 	__raw_writel(ASC_IRNCR_RIR, port->membase + LTQ_ASC_IRNCR);
270 	lqasc_rx_chars(port);
271 	spin_unlock_irqrestore(&ltq_port->lock, flags);
272 	return IRQ_HANDLED;
273 }
274 
275 static irqreturn_t lqasc_irq(int irq, void *p)
276 {
277 	unsigned long flags;
278 	u32 stat;
279 	struct uart_port *port = p;
280 	struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
281 
282 	spin_lock_irqsave(&ltq_port->lock, flags);
283 	stat = readl(port->membase + LTQ_ASC_IRNCR);
284 	spin_unlock_irqrestore(&ltq_port->lock, flags);
285 	if (!(stat & ASC_IRNCR_MASK))
286 		return IRQ_NONE;
287 
288 	if (stat & ASC_IRNCR_TIR)
289 		lqasc_tx_int(irq, p);
290 
291 	if (stat & ASC_IRNCR_RIR)
292 		lqasc_rx_int(irq, p);
293 
294 	if (stat & ASC_IRNCR_EIR)
295 		lqasc_err_int(irq, p);
296 
297 	return IRQ_HANDLED;
298 }
299 
300 static unsigned int
301 lqasc_tx_empty(struct uart_port *port)
302 {
303 	int status;
304 	status = __raw_readl(port->membase + LTQ_ASC_FSTAT) &
305 		 ASCFSTAT_TXFFLMASK;
306 	return status ? 0 : TIOCSER_TEMT;
307 }
308 
309 static unsigned int
310 lqasc_get_mctrl(struct uart_port *port)
311 {
312 	return TIOCM_CTS | TIOCM_CAR | TIOCM_DSR;
313 }
314 
315 static void
316 lqasc_set_mctrl(struct uart_port *port, u_int mctrl)
317 {
318 }
319 
320 static void
321 lqasc_break_ctl(struct uart_port *port, int break_state)
322 {
323 }
324 
325 static int
326 lqasc_startup(struct uart_port *port)
327 {
328 	struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
329 	int retval;
330 	unsigned long flags;
331 
332 	if (!IS_ERR(ltq_port->clk))
333 		clk_prepare_enable(ltq_port->clk);
334 	port->uartclk = clk_get_rate(ltq_port->freqclk);
335 
336 	spin_lock_irqsave(&ltq_port->lock, flags);
337 	asc_update_bits(ASCCLC_DISS | ASCCLC_RMCMASK, (1 << ASCCLC_RMCOFFSET),
338 		port->membase + LTQ_ASC_CLC);
339 
340 	__raw_writel(0, port->membase + LTQ_ASC_PISEL);
341 	__raw_writel(
342 		((TXFIFO_FL << ASCTXFCON_TXFITLOFF) & ASCTXFCON_TXFITLMASK) |
343 		ASCTXFCON_TXFEN | ASCTXFCON_TXFFLU,
344 		port->membase + LTQ_ASC_TXFCON);
345 	__raw_writel(
346 		((RXFIFO_FL << ASCRXFCON_RXFITLOFF) & ASCRXFCON_RXFITLMASK)
347 		| ASCRXFCON_RXFEN | ASCRXFCON_RXFFLU,
348 		port->membase + LTQ_ASC_RXFCON);
349 	/* make sure other settings are written to hardware before
350 	 * setting enable bits
351 	 */
352 	wmb();
353 	asc_update_bits(0, ASCCON_M_8ASYNC | ASCCON_FEN | ASCCON_TOEN |
354 		ASCCON_ROEN, port->membase + LTQ_ASC_CON);
355 
356 	spin_unlock_irqrestore(&ltq_port->lock, flags);
357 
358 	retval = ltq_port->soc->request_irq(port);
359 	if (retval)
360 		return retval;
361 
362 	__raw_writel(ASC_IRNREN_RX | ASC_IRNREN_ERR | ASC_IRNREN_TX,
363 		port->membase + LTQ_ASC_IRNREN);
364 	return retval;
365 }
366 
367 static void
368 lqasc_shutdown(struct uart_port *port)
369 {
370 	struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
371 	unsigned long flags;
372 
373 	ltq_port->soc->free_irq(port);
374 
375 	spin_lock_irqsave(&ltq_port->lock, flags);
376 	__raw_writel(0, port->membase + LTQ_ASC_CON);
377 	asc_update_bits(ASCRXFCON_RXFEN, ASCRXFCON_RXFFLU,
378 		port->membase + LTQ_ASC_RXFCON);
379 	asc_update_bits(ASCTXFCON_TXFEN, ASCTXFCON_TXFFLU,
380 		port->membase + LTQ_ASC_TXFCON);
381 	spin_unlock_irqrestore(&ltq_port->lock, flags);
382 	if (!IS_ERR(ltq_port->clk))
383 		clk_disable_unprepare(ltq_port->clk);
384 }
385 
386 static void
387 lqasc_set_termios(struct uart_port *port, struct ktermios *new,
388 		  const struct ktermios *old)
389 {
390 	unsigned int cflag;
391 	unsigned int iflag;
392 	unsigned int divisor;
393 	unsigned int baud;
394 	unsigned int con = 0;
395 	unsigned long flags;
396 	struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
397 
398 	cflag = new->c_cflag;
399 	iflag = new->c_iflag;
400 
401 	switch (cflag & CSIZE) {
402 	case CS7:
403 		con = ASCCON_M_7ASYNC;
404 		break;
405 
406 	case CS5:
407 	case CS6:
408 	default:
409 		new->c_cflag &= ~ CSIZE;
410 		new->c_cflag |= CS8;
411 		con = ASCCON_M_8ASYNC;
412 		break;
413 	}
414 
415 	cflag &= ~CMSPAR; /* Mark/Space parity is not supported */
416 
417 	if (cflag & CSTOPB)
418 		con |= ASCCON_STP;
419 
420 	if (cflag & PARENB) {
421 		if (!(cflag & PARODD))
422 			con &= ~ASCCON_ODD;
423 		else
424 			con |= ASCCON_ODD;
425 	}
426 
427 	port->read_status_mask = ASCSTATE_ROE;
428 	if (iflag & INPCK)
429 		port->read_status_mask |= ASCSTATE_FE | ASCSTATE_PE;
430 
431 	port->ignore_status_mask = 0;
432 	if (iflag & IGNPAR)
433 		port->ignore_status_mask |= ASCSTATE_FE | ASCSTATE_PE;
434 
435 	if (iflag & IGNBRK) {
436 		/*
437 		 * If we're ignoring parity and break indicators,
438 		 * ignore overruns too (for real raw support).
439 		 */
440 		if (iflag & IGNPAR)
441 			port->ignore_status_mask |= ASCSTATE_ROE;
442 	}
443 
444 	if ((cflag & CREAD) == 0)
445 		port->ignore_status_mask |= UART_DUMMY_UER_RX;
446 
447 	/* set error signals  - framing, parity  and overrun, enable receiver */
448 	con |= ASCCON_FEN | ASCCON_TOEN | ASCCON_ROEN;
449 
450 	spin_lock_irqsave(&ltq_port->lock, flags);
451 
452 	/* set up CON */
453 	asc_update_bits(0, con, port->membase + LTQ_ASC_CON);
454 
455 	/* Set baud rate - take a divider of 2 into account */
456 	baud = uart_get_baud_rate(port, new, old, 0, port->uartclk / 16);
457 	divisor = uart_get_divisor(port, baud);
458 	divisor = divisor / 2 - 1;
459 
460 	/* disable the baudrate generator */
461 	asc_update_bits(ASCCON_R, 0, port->membase + LTQ_ASC_CON);
462 
463 	/* make sure the fractional divider is off */
464 	asc_update_bits(ASCCON_FDE, 0, port->membase + LTQ_ASC_CON);
465 
466 	/* set up to use divisor of 2 */
467 	asc_update_bits(ASCCON_BRS, 0, port->membase + LTQ_ASC_CON);
468 
469 	/* now we can write the new baudrate into the register */
470 	__raw_writel(divisor, port->membase + LTQ_ASC_BG);
471 
472 	/* turn the baudrate generator back on */
473 	asc_update_bits(0, ASCCON_R, port->membase + LTQ_ASC_CON);
474 
475 	/* enable rx */
476 	__raw_writel(ASCWHBSTATE_SETREN, port->membase + LTQ_ASC_WHBSTATE);
477 
478 	spin_unlock_irqrestore(&ltq_port->lock, flags);
479 
480 	/* Don't rewrite B0 */
481 	if (tty_termios_baud_rate(new))
482 		tty_termios_encode_baud_rate(new, baud, baud);
483 
484 	uart_update_timeout(port, cflag, baud);
485 }
486 
487 static const char*
488 lqasc_type(struct uart_port *port)
489 {
490 	if (port->type == PORT_LTQ_ASC)
491 		return DRVNAME;
492 	else
493 		return NULL;
494 }
495 
496 static void
497 lqasc_release_port(struct uart_port *port)
498 {
499 	struct platform_device *pdev = to_platform_device(port->dev);
500 
501 	if (port->flags & UPF_IOREMAP) {
502 		devm_iounmap(&pdev->dev, port->membase);
503 		port->membase = NULL;
504 	}
505 }
506 
507 static int
508 lqasc_request_port(struct uart_port *port)
509 {
510 	struct platform_device *pdev = to_platform_device(port->dev);
511 	struct resource *res;
512 	int size;
513 
514 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
515 	if (!res) {
516 		dev_err(&pdev->dev, "cannot obtain I/O memory region");
517 		return -ENODEV;
518 	}
519 	size = resource_size(res);
520 
521 	res = devm_request_mem_region(&pdev->dev, res->start,
522 		size, dev_name(&pdev->dev));
523 	if (!res) {
524 		dev_err(&pdev->dev, "cannot request I/O memory region");
525 		return -EBUSY;
526 	}
527 
528 	if (port->flags & UPF_IOREMAP) {
529 		port->membase = devm_ioremap(&pdev->dev,
530 			port->mapbase, size);
531 		if (port->membase == NULL)
532 			return -ENOMEM;
533 	}
534 	return 0;
535 }
536 
537 static void
538 lqasc_config_port(struct uart_port *port, int flags)
539 {
540 	if (flags & UART_CONFIG_TYPE) {
541 		port->type = PORT_LTQ_ASC;
542 		lqasc_request_port(port);
543 	}
544 }
545 
546 static int
547 lqasc_verify_port(struct uart_port *port,
548 	struct serial_struct *ser)
549 {
550 	int ret = 0;
551 	if (ser->type != PORT_UNKNOWN && ser->type != PORT_LTQ_ASC)
552 		ret = -EINVAL;
553 	if (ser->irq < 0 || ser->irq >= NR_IRQS)
554 		ret = -EINVAL;
555 	if (ser->baud_base < 9600)
556 		ret = -EINVAL;
557 	return ret;
558 }
559 
560 static const struct uart_ops lqasc_pops = {
561 	.tx_empty =	lqasc_tx_empty,
562 	.set_mctrl =	lqasc_set_mctrl,
563 	.get_mctrl =	lqasc_get_mctrl,
564 	.stop_tx =	lqasc_stop_tx,
565 	.start_tx =	lqasc_start_tx,
566 	.stop_rx =	lqasc_stop_rx,
567 	.break_ctl =	lqasc_break_ctl,
568 	.startup =	lqasc_startup,
569 	.shutdown =	lqasc_shutdown,
570 	.set_termios =	lqasc_set_termios,
571 	.type =		lqasc_type,
572 	.release_port =	lqasc_release_port,
573 	.request_port =	lqasc_request_port,
574 	.config_port =	lqasc_config_port,
575 	.verify_port =	lqasc_verify_port,
576 };
577 
578 #ifdef CONFIG_SERIAL_LANTIQ_CONSOLE
579 static void
580 lqasc_console_putchar(struct uart_port *port, unsigned char ch)
581 {
582 	if (!port->membase)
583 		return;
584 
585 	while (!lqasc_tx_ready(port))
586 		;
587 
588 	writeb(ch, port->membase + LTQ_ASC_TBUF);
589 }
590 
591 static void lqasc_serial_port_write(struct uart_port *port, const char *s,
592 				    u_int count)
593 {
594 	uart_console_write(port, s, count, lqasc_console_putchar);
595 }
596 
597 static void
598 lqasc_console_write(struct console *co, const char *s, u_int count)
599 {
600 	struct ltq_uart_port *ltq_port;
601 	unsigned long flags;
602 
603 	if (co->index >= MAXPORTS)
604 		return;
605 
606 	ltq_port = lqasc_port[co->index];
607 	if (!ltq_port)
608 		return;
609 
610 	spin_lock_irqsave(&ltq_port->lock, flags);
611 	lqasc_serial_port_write(&ltq_port->port, s, count);
612 	spin_unlock_irqrestore(&ltq_port->lock, flags);
613 }
614 
615 static int __init
616 lqasc_console_setup(struct console *co, char *options)
617 {
618 	struct ltq_uart_port *ltq_port;
619 	struct uart_port *port;
620 	int baud = 115200;
621 	int bits = 8;
622 	int parity = 'n';
623 	int flow = 'n';
624 
625 	if (co->index >= MAXPORTS)
626 		return -ENODEV;
627 
628 	ltq_port = lqasc_port[co->index];
629 	if (!ltq_port)
630 		return -ENODEV;
631 
632 	port = &ltq_port->port;
633 
634 	if (!IS_ERR(ltq_port->clk))
635 		clk_prepare_enable(ltq_port->clk);
636 
637 	port->uartclk = clk_get_rate(ltq_port->freqclk);
638 
639 	if (options)
640 		uart_parse_options(options, &baud, &parity, &bits, &flow);
641 	return uart_set_options(port, co, baud, parity, bits, flow);
642 }
643 
644 static struct console lqasc_console = {
645 	.name =		"ttyLTQ",
646 	.write =	lqasc_console_write,
647 	.device =	uart_console_device,
648 	.setup =	lqasc_console_setup,
649 	.flags =	CON_PRINTBUFFER,
650 	.index =	-1,
651 	.data =		&lqasc_reg,
652 };
653 
654 static int __init
655 lqasc_console_init(void)
656 {
657 	register_console(&lqasc_console);
658 	return 0;
659 }
660 console_initcall(lqasc_console_init);
661 
662 static void lqasc_serial_early_console_write(struct console *co,
663 					     const char *s,
664 					     u_int count)
665 {
666 	struct earlycon_device *dev = co->data;
667 
668 	lqasc_serial_port_write(&dev->port, s, count);
669 }
670 
671 static int __init
672 lqasc_serial_early_console_setup(struct earlycon_device *device,
673 				 const char *opt)
674 {
675 	if (!device->port.membase)
676 		return -ENODEV;
677 
678 	device->con->write = lqasc_serial_early_console_write;
679 	return 0;
680 }
681 OF_EARLYCON_DECLARE(lantiq, "lantiq,asc", lqasc_serial_early_console_setup);
682 OF_EARLYCON_DECLARE(lantiq, "intel,lgm-asc", lqasc_serial_early_console_setup);
683 
684 #define LANTIQ_SERIAL_CONSOLE	(&lqasc_console)
685 
686 #else
687 
688 #define LANTIQ_SERIAL_CONSOLE	NULL
689 
690 #endif /* CONFIG_SERIAL_LANTIQ_CONSOLE */
691 
692 static struct uart_driver lqasc_reg = {
693 	.owner =	THIS_MODULE,
694 	.driver_name =	DRVNAME,
695 	.dev_name =	"ttyLTQ",
696 	.major =	0,
697 	.minor =	0,
698 	.nr =		MAXPORTS,
699 	.cons =		LANTIQ_SERIAL_CONSOLE,
700 };
701 
702 static int fetch_irq_lantiq(struct device *dev, struct ltq_uart_port *ltq_port)
703 {
704 	struct uart_port *port = &ltq_port->port;
705 	struct platform_device *pdev = to_platform_device(dev);
706 	int irq;
707 
708 	irq = platform_get_irq(pdev, 0);
709 	if (irq < 0)
710 		return irq;
711 	ltq_port->tx_irq = irq;
712 	irq = platform_get_irq(pdev, 1);
713 	if (irq < 0)
714 		return irq;
715 	ltq_port->rx_irq = irq;
716 	irq = platform_get_irq(pdev, 2);
717 	if (irq < 0)
718 		return irq;
719 	ltq_port->err_irq = irq;
720 
721 	port->irq = ltq_port->tx_irq;
722 
723 	return 0;
724 }
725 
726 static int request_irq_lantiq(struct uart_port *port)
727 {
728 	struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
729 	int retval;
730 
731 	retval = request_irq(ltq_port->tx_irq, lqasc_tx_int,
732 			     0, "asc_tx", port);
733 	if (retval) {
734 		dev_err(port->dev, "failed to request asc_tx\n");
735 		return retval;
736 	}
737 
738 	retval = request_irq(ltq_port->rx_irq, lqasc_rx_int,
739 			     0, "asc_rx", port);
740 	if (retval) {
741 		dev_err(port->dev, "failed to request asc_rx\n");
742 		goto err1;
743 	}
744 
745 	retval = request_irq(ltq_port->err_irq, lqasc_err_int,
746 			     0, "asc_err", port);
747 	if (retval) {
748 		dev_err(port->dev, "failed to request asc_err\n");
749 		goto err2;
750 	}
751 	return 0;
752 
753 err2:
754 	free_irq(ltq_port->rx_irq, port);
755 err1:
756 	free_irq(ltq_port->tx_irq, port);
757 	return retval;
758 }
759 
760 static void free_irq_lantiq(struct uart_port *port)
761 {
762 	struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
763 
764 	free_irq(ltq_port->tx_irq, port);
765 	free_irq(ltq_port->rx_irq, port);
766 	free_irq(ltq_port->err_irq, port);
767 }
768 
769 static int fetch_irq_intel(struct device *dev, struct ltq_uart_port *ltq_port)
770 {
771 	struct uart_port *port = &ltq_port->port;
772 	int ret;
773 
774 	ret = platform_get_irq(to_platform_device(dev), 0);
775 	if (ret < 0) {
776 		dev_err(dev, "failed to fetch IRQ for serial port\n");
777 		return ret;
778 	}
779 	ltq_port->common_irq = ret;
780 	port->irq = ret;
781 
782 	return 0;
783 }
784 
785 static int request_irq_intel(struct uart_port *port)
786 {
787 	struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
788 	int retval;
789 
790 	retval = request_irq(ltq_port->common_irq, lqasc_irq, 0,
791 			     "asc_irq", port);
792 	if (retval)
793 		dev_err(port->dev, "failed to request asc_irq\n");
794 
795 	return retval;
796 }
797 
798 static void free_irq_intel(struct uart_port *port)
799 {
800 	struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
801 
802 	free_irq(ltq_port->common_irq, port);
803 }
804 
805 static int lqasc_probe(struct platform_device *pdev)
806 {
807 	struct device_node *node = pdev->dev.of_node;
808 	struct ltq_uart_port *ltq_port;
809 	struct uart_port *port;
810 	struct resource *mmres;
811 	int line;
812 	int ret;
813 
814 	mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
815 	if (!mmres) {
816 		dev_err(&pdev->dev,
817 			"failed to get memory for serial port\n");
818 		return -ENODEV;
819 	}
820 
821 	ltq_port = devm_kzalloc(&pdev->dev, sizeof(struct ltq_uart_port),
822 				GFP_KERNEL);
823 	if (!ltq_port)
824 		return -ENOMEM;
825 
826 	port = &ltq_port->port;
827 
828 	ltq_port->soc = of_device_get_match_data(&pdev->dev);
829 	ret = ltq_port->soc->fetch_irq(&pdev->dev, ltq_port);
830 	if (ret)
831 		return ret;
832 
833 	/* get serial id */
834 	line = of_alias_get_id(node, "serial");
835 	if (line < 0) {
836 		if (IS_ENABLED(CONFIG_LANTIQ)) {
837 			if (mmres->start == CPHYSADDR(LTQ_EARLY_ASC))
838 				line = 0;
839 			else
840 				line = 1;
841 		} else {
842 			dev_err(&pdev->dev, "failed to get alias id, errno %d\n",
843 				line);
844 			return line;
845 		}
846 	}
847 
848 	if (lqasc_port[line]) {
849 		dev_err(&pdev->dev, "port %d already allocated\n", line);
850 		return -EBUSY;
851 	}
852 
853 	port->iotype	= SERIAL_IO_MEM;
854 	port->flags	= UPF_BOOT_AUTOCONF | UPF_IOREMAP;
855 	port->ops	= &lqasc_pops;
856 	port->fifosize	= 16;
857 	port->type	= PORT_LTQ_ASC;
858 	port->line	= line;
859 	port->dev	= &pdev->dev;
860 	/* unused, just to be backward-compatible */
861 	port->mapbase	= mmres->start;
862 
863 	if (IS_ENABLED(CONFIG_LANTIQ) && !IS_ENABLED(CONFIG_COMMON_CLK))
864 		ltq_port->freqclk = clk_get_fpi();
865 	else
866 		ltq_port->freqclk = devm_clk_get(&pdev->dev, "freq");
867 
868 
869 	if (IS_ERR(ltq_port->freqclk)) {
870 		pr_err("failed to get fpi clk\n");
871 		return -ENOENT;
872 	}
873 
874 	/* not all asc ports have clock gates, lets ignore the return code */
875 	if (IS_ENABLED(CONFIG_LANTIQ) && !IS_ENABLED(CONFIG_COMMON_CLK))
876 		ltq_port->clk = clk_get(&pdev->dev, NULL);
877 	else
878 		ltq_port->clk = devm_clk_get(&pdev->dev, "asc");
879 
880 	spin_lock_init(&ltq_port->lock);
881 	lqasc_port[line] = ltq_port;
882 	platform_set_drvdata(pdev, ltq_port);
883 
884 	ret = uart_add_one_port(&lqasc_reg, port);
885 
886 	return ret;
887 }
888 
889 static int lqasc_remove(struct platform_device *pdev)
890 {
891 	struct uart_port *port = platform_get_drvdata(pdev);
892 
893 	uart_remove_one_port(&lqasc_reg, port);
894 
895 	return 0;
896 }
897 
898 static const struct ltq_soc_data soc_data_lantiq = {
899 	.fetch_irq = fetch_irq_lantiq,
900 	.request_irq = request_irq_lantiq,
901 	.free_irq = free_irq_lantiq,
902 };
903 
904 static const struct ltq_soc_data soc_data_intel = {
905 	.fetch_irq = fetch_irq_intel,
906 	.request_irq = request_irq_intel,
907 	.free_irq = free_irq_intel,
908 };
909 
910 static const struct of_device_id ltq_asc_match[] = {
911 	{ .compatible = "lantiq,asc", .data = &soc_data_lantiq },
912 	{ .compatible = "intel,lgm-asc", .data = &soc_data_intel },
913 	{},
914 };
915 MODULE_DEVICE_TABLE(of, ltq_asc_match);
916 
917 static struct platform_driver lqasc_driver = {
918 	.probe		= lqasc_probe,
919 	.remove		= lqasc_remove,
920 	.driver		= {
921 		.name	= DRVNAME,
922 		.of_match_table = ltq_asc_match,
923 	},
924 };
925 
926 static int __init
927 init_lqasc(void)
928 {
929 	int ret;
930 
931 	ret = uart_register_driver(&lqasc_reg);
932 	if (ret != 0)
933 		return ret;
934 
935 	ret = platform_driver_register(&lqasc_driver);
936 	if (ret != 0)
937 		uart_unregister_driver(&lqasc_reg);
938 
939 	return ret;
940 }
941 
942 static void __exit exit_lqasc(void)
943 {
944 	platform_driver_unregister(&lqasc_driver);
945 	uart_unregister_driver(&lqasc_reg);
946 }
947 
948 module_init(init_lqasc);
949 module_exit(exit_lqasc);
950 
951 MODULE_DESCRIPTION("Serial driver for Lantiq & Intel gateway SoCs");
952 MODULE_LICENSE("GPL v2");
953