1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // S3C64xx specific support for pinctrl-samsung driver.
4 //
5 // Copyright (c) 2013 Tomasz Figa <tomasz.figa@gmail.com>
6 //
7 // Based on pinctrl-exynos.c, please see the file for original copyrights.
8 //
9 // This file contains the Samsung S3C64xx specific information required by the
10 // the Samsung pinctrl/gpiolib driver. It also includes the implementation of
11 // external gpio and wakeup interrupt support.
12 
13 #include <linux/init.h>
14 #include <linux/device.h>
15 #include <linux/interrupt.h>
16 #include <linux/irqdomain.h>
17 #include <linux/irq.h>
18 #include <linux/of_irq.h>
19 #include <linux/io.h>
20 #include <linux/irqchip/chained_irq.h>
21 #include <linux/slab.h>
22 #include <linux/err.h>
23 
24 #include "pinctrl-samsung.h"
25 
26 #define NUM_EINT0		28
27 #define NUM_EINT0_IRQ		4
28 #define EINT_MAX_PER_REG	16
29 #define EINT_MAX_PER_GROUP	16
30 
31 /* External GPIO and wakeup interrupt related definitions */
32 #define SVC_GROUP_SHIFT		4
33 #define SVC_GROUP_MASK		0xf
34 #define SVC_NUM_MASK		0xf
35 #define SVC_GROUP(x)		((x >> SVC_GROUP_SHIFT) & \
36 						SVC_GROUP_MASK)
37 
38 #define EINT12CON_REG		0x200
39 #define EINT12MASK_REG		0x240
40 #define EINT12PEND_REG		0x260
41 
42 #define EINT_OFFS(i)		((i) % (2 * EINT_MAX_PER_GROUP))
43 #define EINT_GROUP(i)		((i) / EINT_MAX_PER_GROUP)
44 #define EINT_REG(g)		(4 * ((g) / 2))
45 
46 #define EINTCON_REG(i)		(EINT12CON_REG + EINT_REG(EINT_GROUP(i)))
47 #define EINTMASK_REG(i)		(EINT12MASK_REG + EINT_REG(EINT_GROUP(i)))
48 #define EINTPEND_REG(i)		(EINT12PEND_REG + EINT_REG(EINT_GROUP(i)))
49 
50 #define SERVICE_REG		0x284
51 #define SERVICEPEND_REG		0x288
52 
53 #define EINT0CON0_REG		0x900
54 #define EINT0MASK_REG		0x920
55 #define EINT0PEND_REG		0x924
56 
57 /* S3C64xx specific external interrupt trigger types */
58 #define EINT_LEVEL_LOW		0
59 #define EINT_LEVEL_HIGH		1
60 #define EINT_EDGE_FALLING	2
61 #define EINT_EDGE_RISING	4
62 #define EINT_EDGE_BOTH		6
63 #define EINT_CON_MASK		0xF
64 #define EINT_CON_LEN		4
65 
66 static const struct samsung_pin_bank_type bank_type_4bit_off = {
67 	.fld_width = { 4, 1, 2, 0, 2, 2, },
68 	.reg_offset = { 0x00, 0x04, 0x08, 0, 0x0c, 0x10, },
69 };
70 
71 static const struct samsung_pin_bank_type bank_type_4bit_alive = {
72 	.fld_width = { 4, 1, 2, },
73 	.reg_offset = { 0x00, 0x04, 0x08, },
74 };
75 
76 static const struct samsung_pin_bank_type bank_type_4bit2_off = {
77 	.fld_width = { 4, 1, 2, 0, 2, 2, },
78 	.reg_offset = { 0x00, 0x08, 0x0c, 0, 0x10, 0x14, },
79 };
80 
81 static const struct samsung_pin_bank_type bank_type_4bit2_alive = {
82 	.fld_width = { 4, 1, 2, },
83 	.reg_offset = { 0x00, 0x08, 0x0c, },
84 };
85 
86 static const struct samsung_pin_bank_type bank_type_2bit_off = {
87 	.fld_width = { 2, 1, 2, 0, 2, 2, },
88 	.reg_offset = { 0x00, 0x04, 0x08, 0, 0x0c, 0x10, },
89 };
90 
91 static const struct samsung_pin_bank_type bank_type_2bit_alive = {
92 	.fld_width = { 2, 1, 2, },
93 	.reg_offset = { 0x00, 0x04, 0x08, },
94 };
95 
96 #define PIN_BANK_4BIT(pins, reg, id)			\
97 	{						\
98 		.type		= &bank_type_4bit_off,	\
99 		.pctl_offset	= reg,			\
100 		.nr_pins	= pins,			\
101 		.eint_type	= EINT_TYPE_NONE,	\
102 		.name		= id			\
103 	}
104 
105 #define PIN_BANK_4BIT_EINTG(pins, reg, id, eoffs)	\
106 	{						\
107 		.type		= &bank_type_4bit_off,	\
108 		.pctl_offset	= reg,			\
109 		.nr_pins	= pins,			\
110 		.eint_type	= EINT_TYPE_GPIO,	\
111 		.eint_func	= 7,			\
112 		.eint_mask	= (1 << (pins)) - 1,	\
113 		.eint_offset	= eoffs,		\
114 		.name		= id			\
115 	}
116 
117 #define PIN_BANK_4BIT_EINTW(pins, reg, id, eoffs, emask) \
118 	{						\
119 		.type		= &bank_type_4bit_alive,\
120 		.pctl_offset	= reg,			\
121 		.nr_pins	= pins,			\
122 		.eint_type	= EINT_TYPE_WKUP,	\
123 		.eint_func	= 3,			\
124 		.eint_mask	= emask,		\
125 		.eint_offset	= eoffs,		\
126 		.name		= id			\
127 	}
128 
129 #define PIN_BANK_4BIT2_EINTG(pins, reg, id, eoffs)	\
130 	{						\
131 		.type		= &bank_type_4bit2_off,	\
132 		.pctl_offset	= reg,			\
133 		.nr_pins	= pins,			\
134 		.eint_type	= EINT_TYPE_GPIO,	\
135 		.eint_func	= 7,			\
136 		.eint_mask	= (1 << (pins)) - 1,	\
137 		.eint_offset	= eoffs,		\
138 		.name		= id			\
139 	}
140 
141 #define PIN_BANK_4BIT2_EINTW(pins, reg, id, eoffs, emask) \
142 	{						\
143 		.type		= &bank_type_4bit2_alive,\
144 		.pctl_offset	= reg,			\
145 		.nr_pins	= pins,			\
146 		.eint_type	= EINT_TYPE_WKUP,	\
147 		.eint_func	= 3,			\
148 		.eint_mask	= emask,		\
149 		.eint_offset	= eoffs,		\
150 		.name		= id			\
151 	}
152 
153 #define PIN_BANK_4BIT2_ALIVE(pins, reg, id)		\
154 	{						\
155 		.type		= &bank_type_4bit2_alive,\
156 		.pctl_offset	= reg,			\
157 		.nr_pins	= pins,			\
158 		.eint_type	= EINT_TYPE_NONE,	\
159 		.name		= id			\
160 	}
161 
162 #define PIN_BANK_2BIT(pins, reg, id)			\
163 	{						\
164 		.type		= &bank_type_2bit_off,	\
165 		.pctl_offset	= reg,			\
166 		.nr_pins	= pins,			\
167 		.eint_type	= EINT_TYPE_NONE,	\
168 		.name		= id			\
169 	}
170 
171 #define PIN_BANK_2BIT_EINTG(pins, reg, id, eoffs, emask) \
172 	{						\
173 		.type		= &bank_type_2bit_off,	\
174 		.pctl_offset	= reg,			\
175 		.nr_pins	= pins,			\
176 		.eint_type	= EINT_TYPE_GPIO,	\
177 		.eint_func	= 3,			\
178 		.eint_mask	= emask,		\
179 		.eint_offset	= eoffs,		\
180 		.name		= id			\
181 	}
182 
183 #define PIN_BANK_2BIT_EINTW(pins, reg, id, eoffs)	\
184 	{						\
185 		.type		= &bank_type_2bit_alive,\
186 		.pctl_offset	= reg,			\
187 		.nr_pins	= pins,			\
188 		.eint_type	= EINT_TYPE_WKUP,	\
189 		.eint_func	= 2,			\
190 		.eint_mask	= (1 << (pins)) - 1,	\
191 		.eint_offset	= eoffs,		\
192 		.name		= id			\
193 	}
194 
195 /**
196  * struct s3c64xx_eint0_data - EINT0 common data
197  * @drvdata: pin controller driver data
198  * @domains: IRQ domains of particular EINT0 interrupts
199  * @pins: pin offsets inside of banks of particular EINT0 interrupts
200  */
201 struct s3c64xx_eint0_data {
202 	struct samsung_pinctrl_drv_data *drvdata;
203 	struct irq_domain *domains[NUM_EINT0];
204 	u8 pins[NUM_EINT0];
205 };
206 
207 /**
208  * struct s3c64xx_eint0_domain_data - EINT0 per-domain data
209  * @bank: pin bank related to the domain
210  * @eints: EINT0 interrupts related to the domain
211  */
212 struct s3c64xx_eint0_domain_data {
213 	struct samsung_pin_bank *bank;
214 	u8 eints[];
215 };
216 
217 /**
218  * struct s3c64xx_eint_gpio_data - GPIO EINT data
219  * @drvdata: pin controller driver data
220  * @domains: array of domains related to EINT interrupt groups
221  */
222 struct s3c64xx_eint_gpio_data {
223 	struct samsung_pinctrl_drv_data *drvdata;
224 	struct irq_domain *domains[];
225 };
226 
227 /*
228  * Common functions for S3C64xx EINT configuration
229  */
230 
231 static int s3c64xx_irq_get_trigger(unsigned int type)
232 {
233 	int trigger;
234 
235 	switch (type) {
236 	case IRQ_TYPE_EDGE_RISING:
237 		trigger = EINT_EDGE_RISING;
238 		break;
239 	case IRQ_TYPE_EDGE_FALLING:
240 		trigger = EINT_EDGE_FALLING;
241 		break;
242 	case IRQ_TYPE_EDGE_BOTH:
243 		trigger = EINT_EDGE_BOTH;
244 		break;
245 	case IRQ_TYPE_LEVEL_HIGH:
246 		trigger = EINT_LEVEL_HIGH;
247 		break;
248 	case IRQ_TYPE_LEVEL_LOW:
249 		trigger = EINT_LEVEL_LOW;
250 		break;
251 	default:
252 		return -EINVAL;
253 	}
254 
255 	return trigger;
256 }
257 
258 static void s3c64xx_irq_set_handler(struct irq_data *d, unsigned int type)
259 {
260 	/* Edge- and level-triggered interrupts need different handlers */
261 	if (type & IRQ_TYPE_EDGE_BOTH)
262 		irq_set_handler_locked(d, handle_edge_irq);
263 	else
264 		irq_set_handler_locked(d, handle_level_irq);
265 }
266 
267 static void s3c64xx_irq_set_function(struct samsung_pinctrl_drv_data *d,
268 					struct samsung_pin_bank *bank, int pin)
269 {
270 	const struct samsung_pin_bank_type *bank_type = bank->type;
271 	unsigned long flags;
272 	void __iomem *reg;
273 	u8 shift;
274 	u32 mask;
275 	u32 val;
276 
277 	/* Make sure that pin is configured as interrupt */
278 	reg = d->virt_base + bank->pctl_offset;
279 	shift = pin;
280 	if (bank_type->fld_width[PINCFG_TYPE_FUNC] * shift >= 32) {
281 		/* 4-bit bank type with 2 con regs */
282 		reg += 4;
283 		shift -= 8;
284 	}
285 
286 	shift = shift * bank_type->fld_width[PINCFG_TYPE_FUNC];
287 	mask = (1 << bank_type->fld_width[PINCFG_TYPE_FUNC]) - 1;
288 
289 	raw_spin_lock_irqsave(&bank->slock, flags);
290 
291 	val = readl(reg);
292 	val &= ~(mask << shift);
293 	val |= bank->eint_func << shift;
294 	writel(val, reg);
295 
296 	raw_spin_unlock_irqrestore(&bank->slock, flags);
297 }
298 
299 /*
300  * Functions for EINT GPIO configuration (EINT groups 1-9)
301  */
302 
303 static inline void s3c64xx_gpio_irq_set_mask(struct irq_data *irqd, bool mask)
304 {
305 	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
306 	struct samsung_pinctrl_drv_data *d = bank->drvdata;
307 	unsigned char index = EINT_OFFS(bank->eint_offset) + irqd->hwirq;
308 	void __iomem *reg = d->virt_base + EINTMASK_REG(bank->eint_offset);
309 	u32 val;
310 
311 	val = readl(reg);
312 	if (mask)
313 		val |= 1 << index;
314 	else
315 		val &= ~(1 << index);
316 	writel(val, reg);
317 }
318 
319 static void s3c64xx_gpio_irq_unmask(struct irq_data *irqd)
320 {
321 	s3c64xx_gpio_irq_set_mask(irqd, false);
322 }
323 
324 static void s3c64xx_gpio_irq_mask(struct irq_data *irqd)
325 {
326 	s3c64xx_gpio_irq_set_mask(irqd, true);
327 }
328 
329 static void s3c64xx_gpio_irq_ack(struct irq_data *irqd)
330 {
331 	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
332 	struct samsung_pinctrl_drv_data *d = bank->drvdata;
333 	unsigned char index = EINT_OFFS(bank->eint_offset) + irqd->hwirq;
334 	void __iomem *reg = d->virt_base + EINTPEND_REG(bank->eint_offset);
335 
336 	writel(1 << index, reg);
337 }
338 
339 static int s3c64xx_gpio_irq_set_type(struct irq_data *irqd, unsigned int type)
340 {
341 	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
342 	struct samsung_pinctrl_drv_data *d = bank->drvdata;
343 	void __iomem *reg;
344 	int trigger;
345 	u8 shift;
346 	u32 val;
347 
348 	trigger = s3c64xx_irq_get_trigger(type);
349 	if (trigger < 0) {
350 		pr_err("unsupported external interrupt type\n");
351 		return -EINVAL;
352 	}
353 
354 	s3c64xx_irq_set_handler(irqd, type);
355 
356 	/* Set up interrupt trigger */
357 	reg = d->virt_base + EINTCON_REG(bank->eint_offset);
358 	shift = EINT_OFFS(bank->eint_offset) + irqd->hwirq;
359 	shift = 4 * (shift / 4); /* 4 EINTs per trigger selector */
360 
361 	val = readl(reg);
362 	val &= ~(EINT_CON_MASK << shift);
363 	val |= trigger << shift;
364 	writel(val, reg);
365 
366 	s3c64xx_irq_set_function(d, bank, irqd->hwirq);
367 
368 	return 0;
369 }
370 
371 /*
372  * irq_chip for gpio interrupts.
373  */
374 static struct irq_chip s3c64xx_gpio_irq_chip = {
375 	.name		= "GPIO",
376 	.irq_unmask	= s3c64xx_gpio_irq_unmask,
377 	.irq_mask	= s3c64xx_gpio_irq_mask,
378 	.irq_ack	= s3c64xx_gpio_irq_ack,
379 	.irq_set_type	= s3c64xx_gpio_irq_set_type,
380 };
381 
382 static int s3c64xx_gpio_irq_map(struct irq_domain *h, unsigned int virq,
383 					irq_hw_number_t hw)
384 {
385 	struct samsung_pin_bank *bank = h->host_data;
386 
387 	if (!(bank->eint_mask & (1 << hw)))
388 		return -EINVAL;
389 
390 	irq_set_chip_and_handler(virq,
391 				&s3c64xx_gpio_irq_chip, handle_level_irq);
392 	irq_set_chip_data(virq, bank);
393 
394 	return 0;
395 }
396 
397 /*
398  * irq domain callbacks for external gpio interrupt controller.
399  */
400 static const struct irq_domain_ops s3c64xx_gpio_irqd_ops = {
401 	.map	= s3c64xx_gpio_irq_map,
402 	.xlate	= irq_domain_xlate_twocell,
403 };
404 
405 static void s3c64xx_eint_gpio_irq(struct irq_desc *desc)
406 {
407 	struct irq_chip *chip = irq_desc_get_chip(desc);
408 	struct s3c64xx_eint_gpio_data *data = irq_desc_get_handler_data(desc);
409 	struct samsung_pinctrl_drv_data *drvdata = data->drvdata;
410 
411 	chained_irq_enter(chip, desc);
412 
413 	do {
414 		unsigned int svc;
415 		unsigned int group;
416 		unsigned int pin;
417 		int ret;
418 
419 		svc = readl(drvdata->virt_base + SERVICE_REG);
420 		group = SVC_GROUP(svc);
421 		pin = svc & SVC_NUM_MASK;
422 
423 		if (!group)
424 			break;
425 
426 		/* Group 1 is used for two pin banks */
427 		if (group == 1) {
428 			if (pin < 8)
429 				group = 0;
430 			else
431 				pin -= 8;
432 		}
433 
434 		ret = generic_handle_domain_irq(data->domains[group], pin);
435 		/*
436 		 * Something must be really wrong if an unmapped EINT
437 		 * was unmasked...
438 		 */
439 		BUG_ON(ret);
440 	} while (1);
441 
442 	chained_irq_exit(chip, desc);
443 }
444 
445 /**
446  * s3c64xx_eint_gpio_init() - setup handling of external gpio interrupts.
447  * @d: driver data of samsung pinctrl driver.
448  */
449 static int s3c64xx_eint_gpio_init(struct samsung_pinctrl_drv_data *d)
450 {
451 	struct s3c64xx_eint_gpio_data *data;
452 	struct samsung_pin_bank *bank;
453 	struct device *dev = d->dev;
454 	unsigned int nr_domains;
455 	unsigned int i;
456 
457 	if (!d->irq) {
458 		dev_err(dev, "irq number not available\n");
459 		return -EINVAL;
460 	}
461 
462 	nr_domains = 0;
463 	bank = d->pin_banks;
464 	for (i = 0; i < d->nr_banks; ++i, ++bank) {
465 		unsigned int nr_eints;
466 		unsigned int mask;
467 
468 		if (bank->eint_type != EINT_TYPE_GPIO)
469 			continue;
470 
471 		mask = bank->eint_mask;
472 		nr_eints = fls(mask);
473 
474 		bank->irq_domain = irq_domain_add_linear(bank->of_node,
475 					nr_eints, &s3c64xx_gpio_irqd_ops, bank);
476 		if (!bank->irq_domain) {
477 			dev_err(dev, "gpio irq domain add failed\n");
478 			return -ENXIO;
479 		}
480 
481 		++nr_domains;
482 	}
483 
484 	data = devm_kzalloc(dev, struct_size(data, domains, nr_domains),
485 			    GFP_KERNEL);
486 	if (!data)
487 		return -ENOMEM;
488 	data->drvdata = d;
489 
490 	bank = d->pin_banks;
491 	nr_domains = 0;
492 	for (i = 0; i < d->nr_banks; ++i, ++bank) {
493 		if (bank->eint_type != EINT_TYPE_GPIO)
494 			continue;
495 
496 		data->domains[nr_domains++] = bank->irq_domain;
497 	}
498 
499 	irq_set_chained_handler_and_data(d->irq, s3c64xx_eint_gpio_irq, data);
500 
501 	return 0;
502 }
503 
504 /*
505  * Functions for configuration of EINT0 wake-up interrupts
506  */
507 
508 static inline void s3c64xx_eint0_irq_set_mask(struct irq_data *irqd, bool mask)
509 {
510 	struct s3c64xx_eint0_domain_data *ddata =
511 					irq_data_get_irq_chip_data(irqd);
512 	struct samsung_pinctrl_drv_data *d = ddata->bank->drvdata;
513 	u32 val;
514 
515 	val = readl(d->virt_base + EINT0MASK_REG);
516 	if (mask)
517 		val |= 1 << ddata->eints[irqd->hwirq];
518 	else
519 		val &= ~(1 << ddata->eints[irqd->hwirq]);
520 	writel(val, d->virt_base + EINT0MASK_REG);
521 }
522 
523 static void s3c64xx_eint0_irq_unmask(struct irq_data *irqd)
524 {
525 	s3c64xx_eint0_irq_set_mask(irqd, false);
526 }
527 
528 static void s3c64xx_eint0_irq_mask(struct irq_data *irqd)
529 {
530 	s3c64xx_eint0_irq_set_mask(irqd, true);
531 }
532 
533 static void s3c64xx_eint0_irq_ack(struct irq_data *irqd)
534 {
535 	struct s3c64xx_eint0_domain_data *ddata =
536 					irq_data_get_irq_chip_data(irqd);
537 	struct samsung_pinctrl_drv_data *d = ddata->bank->drvdata;
538 
539 	writel(1 << ddata->eints[irqd->hwirq],
540 					d->virt_base + EINT0PEND_REG);
541 }
542 
543 static int s3c64xx_eint0_irq_set_type(struct irq_data *irqd, unsigned int type)
544 {
545 	struct s3c64xx_eint0_domain_data *ddata =
546 					irq_data_get_irq_chip_data(irqd);
547 	struct samsung_pin_bank *bank = ddata->bank;
548 	struct samsung_pinctrl_drv_data *d = bank->drvdata;
549 	void __iomem *reg;
550 	int trigger;
551 	u8 shift;
552 	u32 val;
553 
554 	trigger = s3c64xx_irq_get_trigger(type);
555 	if (trigger < 0) {
556 		pr_err("unsupported external interrupt type\n");
557 		return -EINVAL;
558 	}
559 
560 	s3c64xx_irq_set_handler(irqd, type);
561 
562 	/* Set up interrupt trigger */
563 	reg = d->virt_base + EINT0CON0_REG;
564 	shift = ddata->eints[irqd->hwirq];
565 	if (shift >= EINT_MAX_PER_REG) {
566 		reg += 4;
567 		shift -= EINT_MAX_PER_REG;
568 	}
569 	shift = EINT_CON_LEN * (shift / 2);
570 
571 	val = readl(reg);
572 	val &= ~(EINT_CON_MASK << shift);
573 	val |= trigger << shift;
574 	writel(val, reg);
575 
576 	s3c64xx_irq_set_function(d, bank, irqd->hwirq);
577 
578 	return 0;
579 }
580 
581 /*
582  * irq_chip for wakeup interrupts
583  */
584 static struct irq_chip s3c64xx_eint0_irq_chip = {
585 	.name		= "EINT0",
586 	.irq_unmask	= s3c64xx_eint0_irq_unmask,
587 	.irq_mask	= s3c64xx_eint0_irq_mask,
588 	.irq_ack	= s3c64xx_eint0_irq_ack,
589 	.irq_set_type	= s3c64xx_eint0_irq_set_type,
590 };
591 
592 static inline void s3c64xx_irq_demux_eint(struct irq_desc *desc, u32 range)
593 {
594 	struct irq_chip *chip = irq_desc_get_chip(desc);
595 	struct s3c64xx_eint0_data *data = irq_desc_get_handler_data(desc);
596 	struct samsung_pinctrl_drv_data *drvdata = data->drvdata;
597 	unsigned int pend, mask;
598 
599 	chained_irq_enter(chip, desc);
600 
601 	pend = readl(drvdata->virt_base + EINT0PEND_REG);
602 	mask = readl(drvdata->virt_base + EINT0MASK_REG);
603 
604 	pend = pend & range & ~mask;
605 	pend &= range;
606 
607 	while (pend) {
608 		unsigned int irq;
609 		int ret;
610 
611 		irq = fls(pend) - 1;
612 		pend &= ~(1 << irq);
613 		ret = generic_handle_domain_irq(data->domains[irq], data->pins[irq]);
614 		/*
615 		 * Something must be really wrong if an unmapped EINT
616 		 * was unmasked...
617 		 */
618 		BUG_ON(ret);
619 	}
620 
621 	chained_irq_exit(chip, desc);
622 }
623 
624 static void s3c64xx_demux_eint0_3(struct irq_desc *desc)
625 {
626 	s3c64xx_irq_demux_eint(desc, 0xf);
627 }
628 
629 static void s3c64xx_demux_eint4_11(struct irq_desc *desc)
630 {
631 	s3c64xx_irq_demux_eint(desc, 0xff0);
632 }
633 
634 static void s3c64xx_demux_eint12_19(struct irq_desc *desc)
635 {
636 	s3c64xx_irq_demux_eint(desc, 0xff000);
637 }
638 
639 static void s3c64xx_demux_eint20_27(struct irq_desc *desc)
640 {
641 	s3c64xx_irq_demux_eint(desc, 0xff00000);
642 }
643 
644 static irq_flow_handler_t s3c64xx_eint0_handlers[NUM_EINT0_IRQ] = {
645 	s3c64xx_demux_eint0_3,
646 	s3c64xx_demux_eint4_11,
647 	s3c64xx_demux_eint12_19,
648 	s3c64xx_demux_eint20_27,
649 };
650 
651 static int s3c64xx_eint0_irq_map(struct irq_domain *h, unsigned int virq,
652 					irq_hw_number_t hw)
653 {
654 	struct s3c64xx_eint0_domain_data *ddata = h->host_data;
655 	struct samsung_pin_bank *bank = ddata->bank;
656 
657 	if (!(bank->eint_mask & (1 << hw)))
658 		return -EINVAL;
659 
660 	irq_set_chip_and_handler(virq,
661 				&s3c64xx_eint0_irq_chip, handle_level_irq);
662 	irq_set_chip_data(virq, ddata);
663 
664 	return 0;
665 }
666 
667 /*
668  * irq domain callbacks for external wakeup interrupt controller.
669  */
670 static const struct irq_domain_ops s3c64xx_eint0_irqd_ops = {
671 	.map	= s3c64xx_eint0_irq_map,
672 	.xlate	= irq_domain_xlate_twocell,
673 };
674 
675 /* list of external wakeup controllers supported */
676 static const struct of_device_id s3c64xx_eint0_irq_ids[] = {
677 	{ .compatible = "samsung,s3c64xx-wakeup-eint", },
678 	{ }
679 };
680 
681 /**
682  * s3c64xx_eint_eint0_init() - setup handling of external wakeup interrupts.
683  * @d: driver data of samsung pinctrl driver.
684  */
685 static int s3c64xx_eint_eint0_init(struct samsung_pinctrl_drv_data *d)
686 {
687 	struct device *dev = d->dev;
688 	struct device_node *eint0_np = NULL;
689 	struct device_node *np;
690 	struct samsung_pin_bank *bank;
691 	struct s3c64xx_eint0_data *data;
692 	unsigned int i;
693 
694 	for_each_child_of_node(dev->of_node, np) {
695 		if (of_match_node(s3c64xx_eint0_irq_ids, np)) {
696 			eint0_np = np;
697 			break;
698 		}
699 	}
700 	if (!eint0_np)
701 		return -ENODEV;
702 
703 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
704 	if (!data) {
705 		of_node_put(eint0_np);
706 		return -ENOMEM;
707 	}
708 	data->drvdata = d;
709 
710 	for (i = 0; i < NUM_EINT0_IRQ; ++i) {
711 		unsigned int irq;
712 
713 		irq = irq_of_parse_and_map(eint0_np, i);
714 		if (!irq) {
715 			dev_err(dev, "failed to get wakeup EINT IRQ %d\n", i);
716 			of_node_put(eint0_np);
717 			return -ENXIO;
718 		}
719 
720 		irq_set_chained_handler_and_data(irq,
721 						 s3c64xx_eint0_handlers[i],
722 						 data);
723 	}
724 	of_node_put(eint0_np);
725 
726 	bank = d->pin_banks;
727 	for (i = 0; i < d->nr_banks; ++i, ++bank) {
728 		struct s3c64xx_eint0_domain_data *ddata;
729 		unsigned int nr_eints;
730 		unsigned int mask;
731 		unsigned int irq;
732 		unsigned int pin;
733 
734 		if (bank->eint_type != EINT_TYPE_WKUP)
735 			continue;
736 
737 		mask = bank->eint_mask;
738 		nr_eints = fls(mask);
739 
740 		ddata = devm_kzalloc(dev,
741 				sizeof(*ddata) + nr_eints, GFP_KERNEL);
742 		if (!ddata)
743 			return -ENOMEM;
744 		ddata->bank = bank;
745 
746 		bank->irq_domain = irq_domain_add_linear(bank->of_node,
747 				nr_eints, &s3c64xx_eint0_irqd_ops, ddata);
748 		if (!bank->irq_domain) {
749 			dev_err(dev, "wkup irq domain add failed\n");
750 			return -ENXIO;
751 		}
752 
753 		irq = bank->eint_offset;
754 		mask = bank->eint_mask;
755 		for (pin = 0; mask; ++pin, mask >>= 1) {
756 			if (!(mask & 1))
757 				continue;
758 			data->domains[irq] = bank->irq_domain;
759 			data->pins[irq] = pin;
760 			ddata->eints[pin] = irq;
761 			++irq;
762 		}
763 	}
764 
765 	return 0;
766 }
767 
768 /* pin banks of s3c64xx pin-controller 0 */
769 static const struct samsung_pin_bank_data s3c64xx_pin_banks0[] __initconst = {
770 	PIN_BANK_4BIT_EINTG(8, 0x000, "gpa", 0),
771 	PIN_BANK_4BIT_EINTG(7, 0x020, "gpb", 8),
772 	PIN_BANK_4BIT_EINTG(8, 0x040, "gpc", 16),
773 	PIN_BANK_4BIT_EINTG(5, 0x060, "gpd", 32),
774 	PIN_BANK_4BIT(5, 0x080, "gpe"),
775 	PIN_BANK_2BIT_EINTG(16, 0x0a0, "gpf", 48, 0x3fff),
776 	PIN_BANK_4BIT_EINTG(7, 0x0c0, "gpg", 64),
777 	PIN_BANK_4BIT2_EINTG(10, 0x0e0, "gph", 80),
778 	PIN_BANK_2BIT(16, 0x100, "gpi"),
779 	PIN_BANK_2BIT(12, 0x120, "gpj"),
780 	PIN_BANK_4BIT2_ALIVE(16, 0x800, "gpk"),
781 	PIN_BANK_4BIT2_EINTW(15, 0x810, "gpl", 16, 0x7f00),
782 	PIN_BANK_4BIT_EINTW(6, 0x820, "gpm", 23, 0x1f),
783 	PIN_BANK_2BIT_EINTW(16, 0x830, "gpn", 0),
784 	PIN_BANK_2BIT_EINTG(16, 0x140, "gpo", 96, 0xffff),
785 	PIN_BANK_2BIT_EINTG(15, 0x160, "gpp", 112, 0x7fff),
786 	PIN_BANK_2BIT_EINTG(9, 0x180, "gpq", 128, 0x1ff),
787 };
788 
789 /*
790  * Samsung pinctrl driver data for S3C64xx SoC. S3C64xx SoC includes
791  * one gpio/pin-mux/pinconfig controller.
792  */
793 static const struct samsung_pin_ctrl s3c64xx_pin_ctrl[] __initconst = {
794 	{
795 		/* pin-controller instance 1 data */
796 		.pin_banks	= s3c64xx_pin_banks0,
797 		.nr_banks	= ARRAY_SIZE(s3c64xx_pin_banks0),
798 		.eint_gpio_init = s3c64xx_eint_gpio_init,
799 		.eint_wkup_init = s3c64xx_eint_eint0_init,
800 	},
801 };
802 
803 const struct samsung_pinctrl_of_match_data s3c64xx_of_data __initconst = {
804 	.ctrl		= s3c64xx_pin_ctrl,
805 	.num_ctrl	= ARRAY_SIZE(s3c64xx_pin_ctrl),
806 };
807