drivers/pinctrl/samsung/pinctrl-s3c64xx.c - nest-learning-thermostat/5.9.4/linux-imx-ul - Git at Google

 /*
  * S3C64xx specific support for pinctrl-samsung driver.
  *
  * Copyright (c) 2013 Tomasz Figa <tomasz.figa@gmail.com>
  *
  * Based on pinctrl-exynos.c, please see the file for original copyrights.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This file contains the Samsung S3C64xx specific information required by the
  * the Samsung pinctrl/gpiolib driver. It also includes the implementation of
  * external gpio and wakeup interrupt support.
  */

 #include <linux/module.h>
 #include <linux/device.h>
 #include <linux/interrupt.h>
 #include <linux/irqdomain.h>
 #include <linux/irq.h>
 #include <linux/of_irq.h>
 #include <linux/io.h>
 #include <linux/irqchip/chained_irq.h>
 #include <linux/slab.h>
 #include <linux/err.h>

 #include "pinctrl-samsung.h"

 #define NUM_EINT0		28
 #define NUM_EINT0_IRQ		4
 #define EINT_MAX_PER_REG	16
 #define EINT_MAX_PER_GROUP	16

 /* External GPIO and wakeup interrupt related definitions */
 #define SVC_GROUP_SHIFT		4
 #define SVC_GROUP_MASK		0xf
 #define SVC_NUM_MASK		0xf
 #define SVC_GROUP(x)		((x >> SVC_GROUP_SHIFT) & \
 						SVC_GROUP_MASK)

 #define EINT12CON_REG		0x200
 #define EINT12MASK_REG		0x240
 #define EINT12PEND_REG		0x260

 #define EINT_OFFS(i)		((i) % (2 * EINT_MAX_PER_GROUP))
 #define EINT_GROUP(i)		((i) / EINT_MAX_PER_GROUP)
 #define EINT_REG(g)		(4 * ((g) / 2))

 #define EINTCON_REG(i)		(EINT12CON_REG + EINT_REG(EINT_GROUP(i)))
 #define EINTMASK_REG(i)		(EINT12MASK_REG + EINT_REG(EINT_GROUP(i)))
 #define EINTPEND_REG(i)		(EINT12PEND_REG + EINT_REG(EINT_GROUP(i)))

 #define SERVICE_REG		0x284
 #define SERVICEPEND_REG		0x288

 #define EINT0CON0_REG		0x900
 #define EINT0MASK_REG		0x920
 #define EINT0PEND_REG		0x924

 /* S3C64xx specific external interrupt trigger types */
 #define EINT_LEVEL_LOW		0
 #define EINT_LEVEL_HIGH		1
 #define EINT_EDGE_FALLING	2
 #define EINT_EDGE_RISING	4
 #define EINT_EDGE_BOTH		6
 #define EINT_CON_MASK		0xF
 #define EINT_CON_LEN		4

 static const struct samsung_pin_bank_type bank_type_4bit_off = {
 	.fld_width = { 4, 1, 2, 0, 2, 2, },
 	.reg_offset = { 0x00, 0x04, 0x08, 0, 0x0c, 0x10, },
 };

 static const struct samsung_pin_bank_type bank_type_4bit_alive = {
 	.fld_width = { 4, 1, 2, },
 	.reg_offset = { 0x00, 0x04, 0x08, },
 };

 static const struct samsung_pin_bank_type bank_type_4bit2_off = {
 	.fld_width = { 4, 1, 2, 0, 2, 2, },
 	.reg_offset = { 0x00, 0x08, 0x0c, 0, 0x10, 0x14, },
 };

 static const struct samsung_pin_bank_type bank_type_4bit2_alive = {
 	.fld_width = { 4, 1, 2, },
 	.reg_offset = { 0x00, 0x08, 0x0c, },
 };

 static const struct samsung_pin_bank_type bank_type_2bit_off = {
 	.fld_width = { 2, 1, 2, 0, 2, 2, },
 	.reg_offset = { 0x00, 0x04, 0x08, 0, 0x0c, 0x10, },
 };

 static const struct samsung_pin_bank_type bank_type_2bit_alive = {
 	.fld_width = { 2, 1, 2, },
 	.reg_offset = { 0x00, 0x04, 0x08, },
 };

 #define PIN_BANK_4BIT(pins, reg, id)			\
 	{						\
 		.type		= &bank_type_4bit_off,	\
 		.pctl_offset	= reg,			\
 		.nr_pins	= pins,			\
 		.eint_type	= EINT_TYPE_NONE,	\
 		.name		= id			\
 	}

 #define PIN_BANK_4BIT_EINTG(pins, reg, id, eoffs)	\
 	{						\
 		.type		= &bank_type_4bit_off,	\
 		.pctl_offset	= reg,			\
 		.nr_pins	= pins,			\
 		.eint_type	= EINT_TYPE_GPIO,	\
 		.eint_func	= 7,			\
 		.eint_mask	= (1 << (pins)) - 1,	\
 		.eint_offset	= eoffs,		\
 		.name		= id			\
 	}

 #define PIN_BANK_4BIT_EINTW(pins, reg, id, eoffs, emask) \
 	{						\
 		.type		= &bank_type_4bit_alive,\
 		.pctl_offset	= reg,			\
 		.nr_pins	= pins,			\
 		.eint_type	= EINT_TYPE_WKUP,	\
 		.eint_func	= 3,			\
 		.eint_mask	= emask,		\
 		.eint_offset	= eoffs,		\
 		.name		= id			\
 	}

 #define PIN_BANK_4BIT2_EINTG(pins, reg, id, eoffs)	\
 	{						\
 		.type		= &bank_type_4bit2_off,	\
 		.pctl_offset	= reg,			\
 		.nr_pins	= pins,			\
 		.eint_type	= EINT_TYPE_GPIO,	\
 		.eint_func	= 7,			\
 		.eint_mask	= (1 << (pins)) - 1,	\
 		.eint_offset	= eoffs,		\
 		.name		= id			\
 	}

 #define PIN_BANK_4BIT2_EINTW(pins, reg, id, eoffs, emask) \
 	{						\
 		.type		= &bank_type_4bit2_alive,\
 		.pctl_offset	= reg,			\
 		.nr_pins	= pins,			\
 		.eint_type	= EINT_TYPE_WKUP,	\
 		.eint_func	= 3,			\
 		.eint_mask	= emask,		\
 		.eint_offset	= eoffs,		\
 		.name		= id			\
 	}

 #define PIN_BANK_4BIT2_ALIVE(pins, reg, id)		\
 	{						\
 		.type		= &bank_type_4bit2_alive,\
 		.pctl_offset	= reg,			\
 		.nr_pins	= pins,			\
 		.eint_type	= EINT_TYPE_NONE,	\
 		.name		= id			\
 	}

 #define PIN_BANK_2BIT(pins, reg, id)			\
 	{						\
 		.type		= &bank_type_2bit_off,	\
 		.pctl_offset	= reg,			\
 		.nr_pins	= pins,			\
 		.eint_type	= EINT_TYPE_NONE,	\
 		.name		= id			\
 	}

 #define PIN_BANK_2BIT_EINTG(pins, reg, id, eoffs, emask) \
 	{						\
 		.type		= &bank_type_2bit_off,	\
 		.pctl_offset	= reg,			\
 		.nr_pins	= pins,			\
 		.eint_type	= EINT_TYPE_GPIO,	\
 		.eint_func	= 3,			\
 		.eint_mask	= emask,		\
 		.eint_offset	= eoffs,		\
 		.name		= id			\
 	}

 #define PIN_BANK_2BIT_EINTW(pins, reg, id, eoffs)	\
 	{						\
 		.type		= &bank_type_2bit_alive,\
 		.pctl_offset	= reg,			\
 		.nr_pins	= pins,			\
 		.eint_type	= EINT_TYPE_WKUP,	\
 		.eint_func	= 2,			\
 		.eint_mask	= (1 << (pins)) - 1,	\
 		.eint_offset	= eoffs,		\
 		.name		= id			\
 	}

 /**
  * struct s3c64xx_eint0_data: EINT0 common data
  * @drvdata: pin controller driver data
  * @domains: IRQ domains of particular EINT0 interrupts
  * @pins: pin offsets inside of banks of particular EINT0 interrupts
  */
 struct s3c64xx_eint0_data {
 	struct samsung_pinctrl_drv_data *drvdata;
 	struct irq_domain *domains[NUM_EINT0];
 	u8 pins[NUM_EINT0];
 };

 /**
  * struct s3c64xx_eint0_domain_data: EINT0 per-domain data
  * @bank: pin bank related to the domain
  * @eints: EINT0 interrupts related to the domain
  */
 struct s3c64xx_eint0_domain_data {
 	struct samsung_pin_bank *bank;
 	u8 eints[];
 };

 /**
  * struct s3c64xx_eint_gpio_data: GPIO EINT data
  * @drvdata: pin controller driver data
  * @domains: array of domains related to EINT interrupt groups
  */
 struct s3c64xx_eint_gpio_data {
 	struct samsung_pinctrl_drv_data *drvdata;
 	struct irq_domain *domains[];
 };

 /*
  * Common functions for S3C64xx EINT configuration
  */

 static int s3c64xx_irq_get_trigger(unsigned int type)
 {
 	int trigger;

 	switch (type) {
 	case IRQ_TYPE_EDGE_RISING:
 		trigger = EINT_EDGE_RISING;
 		break;
 	case IRQ_TYPE_EDGE_FALLING:
 		trigger = EINT_EDGE_FALLING;
 		break;
 	case IRQ_TYPE_EDGE_BOTH:
 		trigger = EINT_EDGE_BOTH;
 		break;
 	case IRQ_TYPE_LEVEL_HIGH:
 		trigger = EINT_LEVEL_HIGH;
 		break;
 	case IRQ_TYPE_LEVEL_LOW:
 		trigger = EINT_LEVEL_LOW;
 		break;
 	default:
 		return -EINVAL;
 	}

 	return trigger;
 }

 static void s3c64xx_irq_set_handler(unsigned int irq, unsigned int type)
 {
 	/* Edge- and level-triggered interrupts need different handlers */
 	if (type & IRQ_TYPE_EDGE_BOTH)
 		__irq_set_handler_locked(irq, handle_edge_irq);
 	else
 		__irq_set_handler_locked(irq, handle_level_irq);
 }

 static void s3c64xx_irq_set_function(struct samsung_pinctrl_drv_data *d,
 					struct samsung_pin_bank *bank, int pin)
 {
 	const struct samsung_pin_bank_type *bank_type = bank->type;
 	unsigned long flags;
 	void __iomem *reg;
 	u8 shift;
 	u32 mask;
 	u32 val;

 	/* Make sure that pin is configured as interrupt */
 	reg = d->virt_base + bank->pctl_offset;
 	shift = pin;
 	if (bank_type->fld_width[PINCFG_TYPE_FUNC] * shift >= 32) {
 		/* 4-bit bank type with 2 con regs */
 		reg += 4;
 		shift -= 8;
 	}

 	shift = shift * bank_type->fld_width[PINCFG_TYPE_FUNC];
 	mask = (1 << bank_type->fld_width[PINCFG_TYPE_FUNC]) - 1;

 	spin_lock_irqsave(&bank->slock, flags);

 	val = readl(reg);
 	val &= ~(mask << shift);
 	val |= bank->eint_func << shift;
 	writel(val, reg);

 	spin_unlock_irqrestore(&bank->slock, flags);
 }

 /*
  * Functions for EINT GPIO configuration (EINT groups 1-9)
  */

 static inline void s3c64xx_gpio_irq_set_mask(struct irq_data *irqd, bool mask)
 {
 	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
 	struct samsung_pinctrl_drv_data *d = bank->drvdata;
 	unsigned char index = EINT_OFFS(bank->eint_offset) + irqd->hwirq;
 	void __iomem *reg = d->virt_base + EINTMASK_REG(bank->eint_offset);
 	u32 val;

 	val = readl(reg);
 	if (mask)
 		val |= 1 << index;
 	else
 		val &= ~(1 << index);
 	writel(val, reg);
 }

 static void s3c64xx_gpio_irq_unmask(struct irq_data *irqd)
 {
 	s3c64xx_gpio_irq_set_mask(irqd, false);
 }

 static void s3c64xx_gpio_irq_mask(struct irq_data *irqd)
 {
 	s3c64xx_gpio_irq_set_mask(irqd, true);
 }

 static void s3c64xx_gpio_irq_ack(struct irq_data *irqd)
 {
 	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
 	struct samsung_pinctrl_drv_data *d = bank->drvdata;
 	unsigned char index = EINT_OFFS(bank->eint_offset) + irqd->hwirq;
 	void __iomem *reg = d->virt_base + EINTPEND_REG(bank->eint_offset);

 	writel(1 << index, reg);
 }

 static int s3c64xx_gpio_irq_set_type(struct irq_data *irqd, unsigned int type)
 {
 	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
 	struct samsung_pinctrl_drv_data *d = bank->drvdata;
 	void __iomem *reg;
 	int trigger;
 	u8 shift;
 	u32 val;

 	trigger = s3c64xx_irq_get_trigger(type);
 	if (trigger < 0) {
 		pr_err("unsupported external interrupt type\n");
 		return -EINVAL;
 	}

 	s3c64xx_irq_set_handler(irqd->irq, type);

 	/* Set up interrupt trigger */
 	reg = d->virt_base + EINTCON_REG(bank->eint_offset);
 	shift = EINT_OFFS(bank->eint_offset) + irqd->hwirq;
 	shift = 4 * (shift / 4); /* 4 EINTs per trigger selector */

 	val = readl(reg);
 	val &= ~(EINT_CON_MASK << shift);
 	val |= trigger << shift;
 	writel(val, reg);

 	s3c64xx_irq_set_function(d, bank, irqd->hwirq);

 	return 0;
 }

 /*
  * irq_chip for gpio interrupts.
  */
 static struct irq_chip s3c64xx_gpio_irq_chip = {
 	.name		= "GPIO",
 	.irq_unmask	= s3c64xx_gpio_irq_unmask,
 	.irq_mask	= s3c64xx_gpio_irq_mask,
 	.irq_ack	= s3c64xx_gpio_irq_ack,
 	.irq_set_type	= s3c64xx_gpio_irq_set_type,
 };

 static int s3c64xx_gpio_irq_map(struct irq_domain *h, unsigned int virq,
 					irq_hw_number_t hw)
 {
 	struct samsung_pin_bank *bank = h->host_data;

 	if (!(bank->eint_mask & (1 << hw)))
 		return -EINVAL;

 	irq_set_chip_and_handler(virq,
 				&s3c64xx_gpio_irq_chip, handle_level_irq);
 	irq_set_chip_data(virq, bank);
 	set_irq_flags(virq, IRQF_VALID);

 	return 0;
 }

 /*
  * irq domain callbacks for external gpio interrupt controller.
  */
 static const struct irq_domain_ops s3c64xx_gpio_irqd_ops = {
 	.map	= s3c64xx_gpio_irq_map,
 	.xlate	= irq_domain_xlate_twocell,
 };

 static void s3c64xx_eint_gpio_irq(unsigned int irq, struct irq_desc *desc)
 {
 	struct irq_chip *chip = irq_get_chip(irq);
 	struct s3c64xx_eint_gpio_data *data = irq_get_handler_data(irq);
 	struct samsung_pinctrl_drv_data *drvdata = data->drvdata;

 	chained_irq_enter(chip, desc);

 	do {
 		unsigned int svc;
 		unsigned int group;
 		unsigned int pin;
 		unsigned int virq;

 		svc = readl(drvdata->virt_base + SERVICE_REG);
 		group = SVC_GROUP(svc);
 		pin = svc & SVC_NUM_MASK;

 		if (!group)
 			break;

 		/* Group 1 is used for two pin banks */
 		if (group == 1) {
 			if (pin < 8)
 				group = 0;
 			else
 				pin -= 8;
 		}

 		virq = irq_linear_revmap(data->domains[group], pin);
 		/*
 		 * Something must be really wrong if an unmapped EINT
 		 * was unmasked...
 		 */
 		BUG_ON(!virq);

 		generic_handle_irq(virq);
 	} while (1);

 	chained_irq_exit(chip, desc);
 }

 /**
  * s3c64xx_eint_gpio_init() - setup handling of external gpio interrupts.
  * @d: driver data of samsung pinctrl driver.
  */
 static int s3c64xx_eint_gpio_init(struct samsung_pinctrl_drv_data *d)
 {
 	struct s3c64xx_eint_gpio_data *data;
 	struct samsung_pin_bank *bank;
 	struct device *dev = d->dev;
 	unsigned int nr_domains;
 	unsigned int i;

 	if (!d->irq) {
 		dev_err(dev, "irq number not available\n");
 		return -EINVAL;
 	}

 	nr_domains = 0;
 	bank = d->pin_banks;
 	for (i = 0; i < d->nr_banks; ++i, ++bank) {
 		unsigned int nr_eints;
 		unsigned int mask;

 		if (bank->eint_type != EINT_TYPE_GPIO)
 			continue;

 		mask = bank->eint_mask;
 		nr_eints = fls(mask);

 		bank->irq_domain = irq_domain_add_linear(bank->of_node,
 					nr_eints, &s3c64xx_gpio_irqd_ops, bank);
 		if (!bank->irq_domain) {
 			dev_err(dev, "gpio irq domain add failed\n");
 			return -ENXIO;
 		}

 		++nr_domains;
 	}

 	data = devm_kzalloc(dev, sizeof(*data)
 			+ nr_domains * sizeof(*data->domains), GFP_KERNEL);
 	if (!data) {
 		dev_err(dev, "failed to allocate handler data\n");
 		return -ENOMEM;
 	}
 	data->drvdata = d;

 	bank = d->pin_banks;
 	nr_domains = 0;
 	for (i = 0; i < d->nr_banks; ++i, ++bank) {
 		if (bank->eint_type != EINT_TYPE_GPIO)
 			continue;

 		data->domains[nr_domains++] = bank->irq_domain;
 	}

 	irq_set_chained_handler(d->irq, s3c64xx_eint_gpio_irq);
 	irq_set_handler_data(d->irq, data);

 	return 0;
 }

 /*
  * Functions for configuration of EINT0 wake-up interrupts
  */

 static inline void s3c64xx_eint0_irq_set_mask(struct irq_data *irqd, bool mask)
 {
 	struct s3c64xx_eint0_domain_data *ddata =
 					irq_data_get_irq_chip_data(irqd);
 	struct samsung_pinctrl_drv_data *d = ddata->bank->drvdata;
 	u32 val;

 	val = readl(d->virt_base + EINT0MASK_REG);
 	if (mask)
 		val |= 1 << ddata->eints[irqd->hwirq];
 	else
 		val &= ~(1 << ddata->eints[irqd->hwirq]);
 	writel(val, d->virt_base + EINT0MASK_REG);
 }

 static void s3c64xx_eint0_irq_unmask(struct irq_data *irqd)
 {
 	s3c64xx_eint0_irq_set_mask(irqd, false);
 }

 static void s3c64xx_eint0_irq_mask(struct irq_data *irqd)
 {
 	s3c64xx_eint0_irq_set_mask(irqd, true);
 }

 static void s3c64xx_eint0_irq_ack(struct irq_data *irqd)
 {
 	struct s3c64xx_eint0_domain_data *ddata =
 					irq_data_get_irq_chip_data(irqd);
 	struct samsung_pinctrl_drv_data *d = ddata->bank->drvdata;

 	writel(1 << ddata->eints[irqd->hwirq],
 					d->virt_base + EINT0PEND_REG);
 }

 static int s3c64xx_eint0_irq_set_type(struct irq_data *irqd, unsigned int type)
 {
 	struct s3c64xx_eint0_domain_data *ddata =
 					irq_data_get_irq_chip_data(irqd);
 	struct samsung_pin_bank *bank = ddata->bank;
 	struct samsung_pinctrl_drv_data *d = bank->drvdata;
 	void __iomem *reg;
 	int trigger;
 	u8 shift;
 	u32 val;

 	trigger = s3c64xx_irq_get_trigger(type);
 	if (trigger < 0) {
 		pr_err("unsupported external interrupt type\n");
 		return -EINVAL;
 	}

 	s3c64xx_irq_set_handler(irqd->irq, type);

 	/* Set up interrupt trigger */
 	reg = d->virt_base + EINT0CON0_REG;
 	shift = ddata->eints[irqd->hwirq];
 	if (shift >= EINT_MAX_PER_REG) {
 		reg += 4;
 		shift -= EINT_MAX_PER_REG;
 	}
 	shift = EINT_CON_LEN * (shift / 2);

 	val = readl(reg);
 	val &= ~(EINT_CON_MASK << shift);
 	val |= trigger << shift;
 	writel(val, reg);

 	s3c64xx_irq_set_function(d, bank, irqd->hwirq);

 	return 0;
 }

 /*
  * irq_chip for wakeup interrupts
  */
 static struct irq_chip s3c64xx_eint0_irq_chip = {
 	.name		= "EINT0",
 	.irq_unmask	= s3c64xx_eint0_irq_unmask,
 	.irq_mask	= s3c64xx_eint0_irq_mask,
 	.irq_ack	= s3c64xx_eint0_irq_ack,
 	.irq_set_type	= s3c64xx_eint0_irq_set_type,
 };

 static inline void s3c64xx_irq_demux_eint(unsigned int irq,
 					struct irq_desc *desc, u32 range)
 {
 	struct irq_chip *chip = irq_get_chip(irq);
 	struct s3c64xx_eint0_data *data = irq_get_handler_data(irq);
 	struct samsung_pinctrl_drv_data *drvdata = data->drvdata;
 	unsigned int pend, mask;

 	chained_irq_enter(chip, desc);

 	pend = readl(drvdata->virt_base + EINT0PEND_REG);
 	mask = readl(drvdata->virt_base + EINT0MASK_REG);

 	pend = pend & range & ~mask;
 	pend &= range;

 	while (pend) {
 		unsigned int virq;

 		irq = fls(pend) - 1;
 		pend &= ~(1 << irq);

 		virq = irq_linear_revmap(data->domains[irq], data->pins[irq]);
 		/*
 		 * Something must be really wrong if an unmapped EINT
 		 * was unmasked...
 		 */
 		BUG_ON(!virq);

 		generic_handle_irq(virq);
 	}

 	chained_irq_exit(chip, desc);
 }

 static void s3c64xx_demux_eint0_3(unsigned int irq, struct irq_desc *desc)
 {
 	s3c64xx_irq_demux_eint(irq, desc, 0xf);
 }

 static void s3c64xx_demux_eint4_11(unsigned int irq, struct irq_desc *desc)
 {
 	s3c64xx_irq_demux_eint(irq, desc, 0xff0);
 }

 static void s3c64xx_demux_eint12_19(unsigned int irq, struct irq_desc *desc)
 {
 	s3c64xx_irq_demux_eint(irq, desc, 0xff000);
 }

 static void s3c64xx_demux_eint20_27(unsigned int irq, struct irq_desc *desc)
 {
 	s3c64xx_irq_demux_eint(irq, desc, 0xff00000);
 }

 static irq_flow_handler_t s3c64xx_eint0_handlers[NUM_EINT0_IRQ] = {
 	s3c64xx_demux_eint0_3,
 	s3c64xx_demux_eint4_11,
 	s3c64xx_demux_eint12_19,
 	s3c64xx_demux_eint20_27,
 };

 static int s3c64xx_eint0_irq_map(struct irq_domain *h, unsigned int virq,
 					irq_hw_number_t hw)
 {
 	struct s3c64xx_eint0_domain_data *ddata = h->host_data;
 	struct samsung_pin_bank *bank = ddata->bank;

 	if (!(bank->eint_mask & (1 << hw)))
 		return -EINVAL;

 	irq_set_chip_and_handler(virq,
 				&s3c64xx_eint0_irq_chip, handle_level_irq);
 	irq_set_chip_data(virq, ddata);
 	set_irq_flags(virq, IRQF_VALID);

 	return 0;
 }

 /*
  * irq domain callbacks for external wakeup interrupt controller.
  */
 static const struct irq_domain_ops s3c64xx_eint0_irqd_ops = {
 	.map	= s3c64xx_eint0_irq_map,
 	.xlate	= irq_domain_xlate_twocell,
 };

 /* list of external wakeup controllers supported */
 static const struct of_device_id s3c64xx_eint0_irq_ids[] = {
 	{ .compatible = "samsung,s3c64xx-wakeup-eint", },
 	{ }
 };

 /**
  * s3c64xx_eint_eint0_init() - setup handling of external wakeup interrupts.
  * @d: driver data of samsung pinctrl driver.
  */
 static int s3c64xx_eint_eint0_init(struct samsung_pinctrl_drv_data *d)
 {
 	struct device *dev = d->dev;
 	struct device_node *eint0_np = NULL;
 	struct device_node *np;
 	struct samsung_pin_bank *bank;
 	struct s3c64xx_eint0_data *data;
 	unsigned int i;

 	for_each_child_of_node(dev->of_node, np) {
 		if (of_match_node(s3c64xx_eint0_irq_ids, np)) {
 			eint0_np = np;
 			break;
 		}
 	}
 	if (!eint0_np)
 		return -ENODEV;

 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 	if (!data) {
 		dev_err(dev, "could not allocate memory for wkup eint data\n");
 		return -ENOMEM;
 	}
 	data->drvdata = d;

 	for (i = 0; i < NUM_EINT0_IRQ; ++i) {
 		unsigned int irq;

 		irq = irq_of_parse_and_map(eint0_np, i);
 		if (!irq) {
 			dev_err(dev, "failed to get wakeup EINT IRQ %d\n", i);
 			return -ENXIO;
 		}

 		irq_set_chained_handler(irq, s3c64xx_eint0_handlers[i]);
 		irq_set_handler_data(irq, data);
 	}

 	bank = d->pin_banks;
 	for (i = 0; i < d->nr_banks; ++i, ++bank) {
 		struct s3c64xx_eint0_domain_data *ddata;
 		unsigned int nr_eints;
 		unsigned int mask;
 		unsigned int irq;
 		unsigned int pin;

 		if (bank->eint_type != EINT_TYPE_WKUP)
 			continue;

 		mask = bank->eint_mask;
 		nr_eints = fls(mask);

 		ddata = devm_kzalloc(dev,
 				sizeof(*ddata) + nr_eints, GFP_KERNEL);
 		if (!ddata) {
 			dev_err(dev, "failed to allocate domain data\n");
 			return -ENOMEM;
 		}
 		ddata->bank = bank;

 		bank->irq_domain = irq_domain_add_linear(bank->of_node,
 				nr_eints, &s3c64xx_eint0_irqd_ops, ddata);
 		if (!bank->irq_domain) {
 			dev_err(dev, "wkup irq domain add failed\n");
 			return -ENXIO;
 		}

 		irq = bank->eint_offset;
 		mask = bank->eint_mask;
 		for (pin = 0; mask; ++pin, mask >>= 1) {
 			if (!(mask & 1))
 				continue;
 			data->domains[irq] = bank->irq_domain;
 			data->pins[irq] = pin;
 			ddata->eints[pin] = irq;
 			++irq;
 		}
 	}

 	return 0;
 }

 /* pin banks of s3c64xx pin-controller 0 */
 static const struct samsung_pin_bank_data s3c64xx_pin_banks0[] __initconst = {
 	PIN_BANK_4BIT_EINTG(8, 0x000, "gpa", 0),
 	PIN_BANK_4BIT_EINTG(7, 0x020, "gpb", 8),
 	PIN_BANK_4BIT_EINTG(8, 0x040, "gpc", 16),
 	PIN_BANK_4BIT_EINTG(5, 0x060, "gpd", 32),
 	PIN_BANK_4BIT(5, 0x080, "gpe"),
 	PIN_BANK_2BIT_EINTG(16, 0x0a0, "gpf", 48, 0x3fff),
 	PIN_BANK_4BIT_EINTG(7, 0x0c0, "gpg", 64),
 	PIN_BANK_4BIT2_EINTG(10, 0x0e0, "gph", 80),
 	PIN_BANK_2BIT(16, 0x100, "gpi"),
 	PIN_BANK_2BIT(12, 0x120, "gpj"),
 	PIN_BANK_4BIT2_ALIVE(16, 0x800, "gpk"),
 	PIN_BANK_4BIT2_EINTW(15, 0x810, "gpl", 16, 0x7f00),
 	PIN_BANK_4BIT_EINTW(6, 0x820, "gpm", 23, 0x1f),
 	PIN_BANK_2BIT_EINTW(16, 0x830, "gpn", 0),
 	PIN_BANK_2BIT_EINTG(16, 0x140, "gpo", 96, 0xffff),
 	PIN_BANK_2BIT_EINTG(15, 0x160, "gpp", 112, 0x7fff),
 	PIN_BANK_2BIT_EINTG(9, 0x180, "gpq", 128, 0x1ff),
 };

 /*
  * Samsung pinctrl driver data for S3C64xx SoC. S3C64xx SoC includes
  * one gpio/pin-mux/pinconfig controller.
  */
 const struct samsung_pin_ctrl s3c64xx_pin_ctrl[] __initconst = {
 	{
 		/* pin-controller instance 1 data */
 		.pin_banks	= s3c64xx_pin_banks0,
 		.nr_banks	= ARRAY_SIZE(s3c64xx_pin_banks0),
 		.eint_gpio_init = s3c64xx_eint_gpio_init,
 		.eint_wkup_init = s3c64xx_eint_eint0_init,
 	},
 };
	/*
	* S3C64xx specific support for pinctrl-samsung driver.
	*
	* Copyright (c) 2013 Tomasz Figa <tomasz.figa@gmail.com>
	*
	* Based on pinctrl-exynos.c, please see the file for original copyrights.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This file contains the Samsung S3C64xx specific information required by the
	* the Samsung pinctrl/gpiolib driver. It also includes the implementation of
	* external gpio and wakeup interrupt support.
	*/

	#include <linux/module.h>
	#include <linux/device.h>
	#include <linux/interrupt.h>
	#include <linux/irqdomain.h>
	#include <linux/irq.h>
	#include <linux/of_irq.h>
	#include <linux/io.h>
	#include <linux/irqchip/chained_irq.h>
	#include <linux/slab.h>
	#include <linux/err.h>

	#include "pinctrl-samsung.h"

	#define NUM_EINT0 28
	#define NUM_EINT0_IRQ 4
	#define EINT_MAX_PER_REG 16
	#define EINT_MAX_PER_GROUP 16

	/* External GPIO and wakeup interrupt related definitions */
	#define SVC_GROUP_SHIFT 4
	#define SVC_GROUP_MASK 0xf
	#define SVC_NUM_MASK 0xf
	#define SVC_GROUP(x) ((x >> SVC_GROUP_SHIFT) & \
	SVC_GROUP_MASK)

	#define EINT12CON_REG 0x200
	#define EINT12MASK_REG 0x240
	#define EINT12PEND_REG 0x260

	#define EINT_OFFS(i) ((i) % (2 * EINT_MAX_PER_GROUP))
	#define EINT_GROUP(i) ((i) / EINT_MAX_PER_GROUP)
	#define EINT_REG(g) (4 * ((g) / 2))

	#define EINTCON_REG(i) (EINT12CON_REG + EINT_REG(EINT_GROUP(i)))
	#define EINTMASK_REG(i) (EINT12MASK_REG + EINT_REG(EINT_GROUP(i)))
	#define EINTPEND_REG(i) (EINT12PEND_REG + EINT_REG(EINT_GROUP(i)))

	#define SERVICE_REG 0x284
	#define SERVICEPEND_REG 0x288

	#define EINT0CON0_REG 0x900
	#define EINT0MASK_REG 0x920
	#define EINT0PEND_REG 0x924

	/* S3C64xx specific external interrupt trigger types */
	#define EINT_LEVEL_LOW 0
	#define EINT_LEVEL_HIGH 1
	#define EINT_EDGE_FALLING 2
	#define EINT_EDGE_RISING 4
	#define EINT_EDGE_BOTH 6
	#define EINT_CON_MASK 0xF
	#define EINT_CON_LEN 4

	static const struct samsung_pin_bank_type bank_type_4bit_off = {
	.fld_width = { 4, 1, 2, 0, 2, 2, },
	.reg_offset = { 0x00, 0x04, 0x08, 0, 0x0c, 0x10, },
	};

	static const struct samsung_pin_bank_type bank_type_4bit_alive = {
	.fld_width = { 4, 1, 2, },
	.reg_offset = { 0x00, 0x04, 0x08, },
	};

	static const struct samsung_pin_bank_type bank_type_4bit2_off = {
	.fld_width = { 4, 1, 2, 0, 2, 2, },
	.reg_offset = { 0x00, 0x08, 0x0c, 0, 0x10, 0x14, },
	};

	static const struct samsung_pin_bank_type bank_type_4bit2_alive = {
	.fld_width = { 4, 1, 2, },
	.reg_offset = { 0x00, 0x08, 0x0c, },
	};

	static const struct samsung_pin_bank_type bank_type_2bit_off = {
	.fld_width = { 2, 1, 2, 0, 2, 2, },
	.reg_offset = { 0x00, 0x04, 0x08, 0, 0x0c, 0x10, },
	};

	static const struct samsung_pin_bank_type bank_type_2bit_alive = {
	.fld_width = { 2, 1, 2, },
	.reg_offset = { 0x00, 0x04, 0x08, },
	};

	#define PIN_BANK_4BIT(pins, reg, id) \
	{ \
	.type = &bank_type_4bit_off, \
	.pctl_offset = reg, \
	.nr_pins = pins, \
	.eint_type = EINT_TYPE_NONE, \
	.name = id \
	}

	#define PIN_BANK_4BIT_EINTG(pins, reg, id, eoffs) \
	{ \
	.type = &bank_type_4bit_off, \
	.pctl_offset = reg, \
	.nr_pins = pins, \
	.eint_type = EINT_TYPE_GPIO, \
	.eint_func = 7, \
	.eint_mask = (1 << (pins)) - 1, \
	.eint_offset = eoffs, \
	.name = id \
	}

	#define PIN_BANK_4BIT_EINTW(pins, reg, id, eoffs, emask) \
	{ \
	.type = &bank_type_4bit_alive,\
	.pctl_offset = reg, \
	.nr_pins = pins, \
	.eint_type = EINT_TYPE_WKUP, \
	.eint_func = 3, \
	.eint_mask = emask, \
	.eint_offset = eoffs, \
	.name = id \
	}

	#define PIN_BANK_4BIT2_EINTG(pins, reg, id, eoffs) \
	{ \
	.type = &bank_type_4bit2_off, \
	.pctl_offset = reg, \
	.nr_pins = pins, \
	.eint_type = EINT_TYPE_GPIO, \
	.eint_func = 7, \
	.eint_mask = (1 << (pins)) - 1, \
	.eint_offset = eoffs, \
	.name = id \
	}

	#define PIN_BANK_4BIT2_EINTW(pins, reg, id, eoffs, emask) \
	{ \
	.type = &bank_type_4bit2_alive,\
	.pctl_offset = reg, \
	.nr_pins = pins, \
	.eint_type = EINT_TYPE_WKUP, \
	.eint_func = 3, \
	.eint_mask = emask, \
	.eint_offset = eoffs, \
	.name = id \
	}

	#define PIN_BANK_4BIT2_ALIVE(pins, reg, id) \
	{ \
	.type = &bank_type_4bit2_alive,\
	.pctl_offset = reg, \
	.nr_pins = pins, \
	.eint_type = EINT_TYPE_NONE, \
	.name = id \
	}

	#define PIN_BANK_2BIT(pins, reg, id) \
	{ \
	.type = &bank_type_2bit_off, \
	.pctl_offset = reg, \
	.nr_pins = pins, \
	.eint_type = EINT_TYPE_NONE, \
	.name = id \
	}

	#define PIN_BANK_2BIT_EINTG(pins, reg, id, eoffs, emask) \
	{ \
	.type = &bank_type_2bit_off, \
	.pctl_offset = reg, \
	.nr_pins = pins, \
	.eint_type = EINT_TYPE_GPIO, \
	.eint_func = 3, \
	.eint_mask = emask, \
	.eint_offset = eoffs, \
	.name = id \
	}

	#define PIN_BANK_2BIT_EINTW(pins, reg, id, eoffs) \
	{ \
	.type = &bank_type_2bit_alive,\
	.pctl_offset = reg, \
	.nr_pins = pins, \
	.eint_type = EINT_TYPE_WKUP, \
	.eint_func = 2, \
	.eint_mask = (1 << (pins)) - 1, \
	.eint_offset = eoffs, \
	.name = id \
	}

	/**
	* struct s3c64xx_eint0_data: EINT0 common data
	* @drvdata: pin controller driver data
	* @domains: IRQ domains of particular EINT0 interrupts
	* @pins: pin offsets inside of banks of particular EINT0 interrupts
	*/
	struct s3c64xx_eint0_data {
	struct samsung_pinctrl_drv_data *drvdata;
	struct irq_domain *domains[NUM_EINT0];
	u8 pins[NUM_EINT0];
	};

	/**
	* struct s3c64xx_eint0_domain_data: EINT0 per-domain data
	* @bank: pin bank related to the domain
	* @eints: EINT0 interrupts related to the domain
	*/
	struct s3c64xx_eint0_domain_data {
	struct samsung_pin_bank *bank;
	u8 eints[];
	};

	/**
	* struct s3c64xx_eint_gpio_data: GPIO EINT data
	* @drvdata: pin controller driver data
	* @domains: array of domains related to EINT interrupt groups
	*/
	struct s3c64xx_eint_gpio_data {
	struct samsung_pinctrl_drv_data *drvdata;
	struct irq_domain *domains[];
	};

	/*
	* Common functions for S3C64xx EINT configuration
	*/

	static int s3c64xx_irq_get_trigger(unsigned int type)
	{
	int trigger;

	switch (type) {
	case IRQ_TYPE_EDGE_RISING:
	trigger = EINT_EDGE_RISING;
	break;
	case IRQ_TYPE_EDGE_FALLING:
	trigger = EINT_EDGE_FALLING;
	break;
	case IRQ_TYPE_EDGE_BOTH:
	trigger = EINT_EDGE_BOTH;
	break;
	case IRQ_TYPE_LEVEL_HIGH:
	trigger = EINT_LEVEL_HIGH;
	break;
	case IRQ_TYPE_LEVEL_LOW:
	trigger = EINT_LEVEL_LOW;
	break;
	default:
	return -EINVAL;
	}

	return trigger;
	}

	static void s3c64xx_irq_set_handler(unsigned int irq, unsigned int type)
	{
	/* Edge- and level-triggered interrupts need different handlers */
	if (type & IRQ_TYPE_EDGE_BOTH)
	__irq_set_handler_locked(irq, handle_edge_irq);
	else
	__irq_set_handler_locked(irq, handle_level_irq);
	}

	static void s3c64xx_irq_set_function(struct samsung_pinctrl_drv_data *d,
	struct samsung_pin_bank *bank, int pin)
	{
	const struct samsung_pin_bank_type *bank_type = bank->type;
	unsigned long flags;
	void __iomem *reg;
	u8 shift;
	u32 mask;
	u32 val;

	/* Make sure that pin is configured as interrupt */
	reg = d->virt_base + bank->pctl_offset;
	shift = pin;
	if (bank_type->fld_width[PINCFG_TYPE_FUNC] * shift >= 32) {
	/* 4-bit bank type with 2 con regs */
	reg += 4;
	shift -= 8;
	}

	shift = shift * bank_type->fld_width[PINCFG_TYPE_FUNC];
	mask = (1 << bank_type->fld_width[PINCFG_TYPE_FUNC]) - 1;

	spin_lock_irqsave(&bank->slock, flags);

	val = readl(reg);
	val &= ~(mask << shift);
	val \|= bank->eint_func << shift;
	writel(val, reg);

	spin_unlock_irqrestore(&bank->slock, flags);
	}

	/*
	* Functions for EINT GPIO configuration (EINT groups 1-9)
	*/

	static inline void s3c64xx_gpio_irq_set_mask(struct irq_data *irqd, bool mask)
	{
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
	struct samsung_pinctrl_drv_data *d = bank->drvdata;
	unsigned char index = EINT_OFFS(bank->eint_offset) + irqd->hwirq;
	void __iomem *reg = d->virt_base + EINTMASK_REG(bank->eint_offset);
	u32 val;

	val = readl(reg);
	if (mask)
	val \|= 1 << index;
	else
	val &= ~(1 << index);
	writel(val, reg);
	}

	static void s3c64xx_gpio_irq_unmask(struct irq_data *irqd)
	{
	s3c64xx_gpio_irq_set_mask(irqd, false);
	}

	static void s3c64xx_gpio_irq_mask(struct irq_data *irqd)
	{
	s3c64xx_gpio_irq_set_mask(irqd, true);
	}

	static void s3c64xx_gpio_irq_ack(struct irq_data *irqd)
	{
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
	struct samsung_pinctrl_drv_data *d = bank->drvdata;
	unsigned char index = EINT_OFFS(bank->eint_offset) + irqd->hwirq;
	void __iomem *reg = d->virt_base + EINTPEND_REG(bank->eint_offset);

	writel(1 << index, reg);
	}

	static int s3c64xx_gpio_irq_set_type(struct irq_data *irqd, unsigned int type)
	{
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
	struct samsung_pinctrl_drv_data *d = bank->drvdata;
	void __iomem *reg;
	int trigger;
	u8 shift;
	u32 val;

	trigger = s3c64xx_irq_get_trigger(type);
	if (trigger < 0) {
	pr_err("unsupported external interrupt type\n");
	return -EINVAL;
	}

	s3c64xx_irq_set_handler(irqd->irq, type);

	/* Set up interrupt trigger */
	reg = d->virt_base + EINTCON_REG(bank->eint_offset);
	shift = EINT_OFFS(bank->eint_offset) + irqd->hwirq;
	shift = 4 * (shift / 4); /* 4 EINTs per trigger selector */

	val = readl(reg);
	val &= ~(EINT_CON_MASK << shift);
	val \|= trigger << shift;
	writel(val, reg);

	s3c64xx_irq_set_function(d, bank, irqd->hwirq);

	return 0;
	}

	/*
	* irq_chip for gpio interrupts.
	*/
	static struct irq_chip s3c64xx_gpio_irq_chip = {
	.name = "GPIO",
	.irq_unmask = s3c64xx_gpio_irq_unmask,
	.irq_mask = s3c64xx_gpio_irq_mask,
	.irq_ack = s3c64xx_gpio_irq_ack,
	.irq_set_type = s3c64xx_gpio_irq_set_type,
	};

	static int s3c64xx_gpio_irq_map(struct irq_domain *h, unsigned int virq,
	irq_hw_number_t hw)
	{
	struct samsung_pin_bank *bank = h->host_data;

	if (!(bank->eint_mask & (1 << hw)))
	return -EINVAL;

	irq_set_chip_and_handler(virq,
	&s3c64xx_gpio_irq_chip, handle_level_irq);
	irq_set_chip_data(virq, bank);
	set_irq_flags(virq, IRQF_VALID);

	return 0;
	}

	/*
	* irq domain callbacks for external gpio interrupt controller.
	*/
	static const struct irq_domain_ops s3c64xx_gpio_irqd_ops = {
	.map = s3c64xx_gpio_irq_map,
	.xlate = irq_domain_xlate_twocell,
	};

	static void s3c64xx_eint_gpio_irq(unsigned int irq, struct irq_desc *desc)
	{
	struct irq_chip *chip = irq_get_chip(irq);
	struct s3c64xx_eint_gpio_data *data = irq_get_handler_data(irq);
	struct samsung_pinctrl_drv_data *drvdata = data->drvdata;

	chained_irq_enter(chip, desc);

	do {
	unsigned int svc;
	unsigned int group;
	unsigned int pin;
	unsigned int virq;

	svc = readl(drvdata->virt_base + SERVICE_REG);
	group = SVC_GROUP(svc);
	pin = svc & SVC_NUM_MASK;

	if (!group)
	break;

	/* Group 1 is used for two pin banks */
	if (group == 1) {
	if (pin < 8)
	group = 0;
	else
	pin -= 8;
	}

	virq = irq_linear_revmap(data->domains[group], pin);
	/*
	* Something must be really wrong if an unmapped EINT
	* was unmasked...
	*/
	BUG_ON(!virq);

	generic_handle_irq(virq);
	} while (1);

	chained_irq_exit(chip, desc);
	}

	/**
	* s3c64xx_eint_gpio_init() - setup handling of external gpio interrupts.
	* @d: driver data of samsung pinctrl driver.
	*/
	static int s3c64xx_eint_gpio_init(struct samsung_pinctrl_drv_data *d)
	{
	struct s3c64xx_eint_gpio_data *data;
	struct samsung_pin_bank *bank;
	struct device *dev = d->dev;
	unsigned int nr_domains;
	unsigned int i;

	if (!d->irq) {
	dev_err(dev, "irq number not available\n");
	return -EINVAL;
	}

	nr_domains = 0;
	bank = d->pin_banks;
	for (i = 0; i < d->nr_banks; ++i, ++bank) {
	unsigned int nr_eints;
	unsigned int mask;

	if (bank->eint_type != EINT_TYPE_GPIO)
	continue;

	mask = bank->eint_mask;
	nr_eints = fls(mask);

	bank->irq_domain = irq_domain_add_linear(bank->of_node,
	nr_eints, &s3c64xx_gpio_irqd_ops, bank);
	if (!bank->irq_domain) {
	dev_err(dev, "gpio irq domain add failed\n");
	return -ENXIO;
	}

	++nr_domains;
	}

	data = devm_kzalloc(dev, sizeof(*data)
	+ nr_domains * sizeof(*data->domains), GFP_KERNEL);
	if (!data) {
	dev_err(dev, "failed to allocate handler data\n");
	return -ENOMEM;
	}
	data->drvdata = d;

	bank = d->pin_banks;
	nr_domains = 0;
	for (i = 0; i < d->nr_banks; ++i, ++bank) {
	if (bank->eint_type != EINT_TYPE_GPIO)
	continue;

	data->domains[nr_domains++] = bank->irq_domain;
	}

	irq_set_chained_handler(d->irq, s3c64xx_eint_gpio_irq);
	irq_set_handler_data(d->irq, data);

	return 0;
	}

	/*
	* Functions for configuration of EINT0 wake-up interrupts
	*/

	static inline void s3c64xx_eint0_irq_set_mask(struct irq_data *irqd, bool mask)
	{
	struct s3c64xx_eint0_domain_data *ddata =
	irq_data_get_irq_chip_data(irqd);
	struct samsung_pinctrl_drv_data *d = ddata->bank->drvdata;
	u32 val;

	val = readl(d->virt_base + EINT0MASK_REG);
	if (mask)
	val \|= 1 << ddata->eints[irqd->hwirq];
	else
	val &= ~(1 << ddata->eints[irqd->hwirq]);
	writel(val, d->virt_base + EINT0MASK_REG);
	}

	static void s3c64xx_eint0_irq_unmask(struct irq_data *irqd)
	{
	s3c64xx_eint0_irq_set_mask(irqd, false);
	}

	static void s3c64xx_eint0_irq_mask(struct irq_data *irqd)
	{
	s3c64xx_eint0_irq_set_mask(irqd, true);
	}

	static void s3c64xx_eint0_irq_ack(struct irq_data *irqd)
	{
	struct s3c64xx_eint0_domain_data *ddata =
	irq_data_get_irq_chip_data(irqd);
	struct samsung_pinctrl_drv_data *d = ddata->bank->drvdata;

	writel(1 << ddata->eints[irqd->hwirq],
	d->virt_base + EINT0PEND_REG);
	}

	static int s3c64xx_eint0_irq_set_type(struct irq_data *irqd, unsigned int type)
	{
	struct s3c64xx_eint0_domain_data *ddata =
	irq_data_get_irq_chip_data(irqd);
	struct samsung_pin_bank *bank = ddata->bank;
	struct samsung_pinctrl_drv_data *d = bank->drvdata;
	void __iomem *reg;
	int trigger;
	u8 shift;
	u32 val;

	trigger = s3c64xx_irq_get_trigger(type);
	if (trigger < 0) {
	pr_err("unsupported external interrupt type\n");
	return -EINVAL;
	}

	s3c64xx_irq_set_handler(irqd->irq, type);

	/* Set up interrupt trigger */
	reg = d->virt_base + EINT0CON0_REG;
	shift = ddata->eints[irqd->hwirq];
	if (shift >= EINT_MAX_PER_REG) {
	reg += 4;
	shift -= EINT_MAX_PER_REG;
	}
	shift = EINT_CON_LEN * (shift / 2);

	val = readl(reg);
	val &= ~(EINT_CON_MASK << shift);
	val \|= trigger << shift;
	writel(val, reg);

	s3c64xx_irq_set_function(d, bank, irqd->hwirq);

	return 0;
	}

	/*
	* irq_chip for wakeup interrupts
	*/
	static struct irq_chip s3c64xx_eint0_irq_chip = {
	.name = "EINT0",
	.irq_unmask = s3c64xx_eint0_irq_unmask,
	.irq_mask = s3c64xx_eint0_irq_mask,
	.irq_ack = s3c64xx_eint0_irq_ack,
	.irq_set_type = s3c64xx_eint0_irq_set_type,
	};

	static inline void s3c64xx_irq_demux_eint(unsigned int irq,
	struct irq_desc *desc, u32 range)
	{
	struct irq_chip *chip = irq_get_chip(irq);
	struct s3c64xx_eint0_data *data = irq_get_handler_data(irq);
	struct samsung_pinctrl_drv_data *drvdata = data->drvdata;
	unsigned int pend, mask;

	chained_irq_enter(chip, desc);

	pend = readl(drvdata->virt_base + EINT0PEND_REG);
	mask = readl(drvdata->virt_base + EINT0MASK_REG);

	pend = pend & range & ~mask;
	pend &= range;

	while (pend) {
	unsigned int virq;

	irq = fls(pend) - 1;
	pend &= ~(1 << irq);

	virq = irq_linear_revmap(data->domains[irq], data->pins[irq]);
	/*
	* Something must be really wrong if an unmapped EINT
	* was unmasked...
	*/
	BUG_ON(!virq);

	generic_handle_irq(virq);
	}

	chained_irq_exit(chip, desc);
	}

	static void s3c64xx_demux_eint0_3(unsigned int irq, struct irq_desc *desc)
	{
	s3c64xx_irq_demux_eint(irq, desc, 0xf);
	}

	static void s3c64xx_demux_eint4_11(unsigned int irq, struct irq_desc *desc)
	{
	s3c64xx_irq_demux_eint(irq, desc, 0xff0);
	}

	static void s3c64xx_demux_eint12_19(unsigned int irq, struct irq_desc *desc)
	{
	s3c64xx_irq_demux_eint(irq, desc, 0xff000);
	}

	static void s3c64xx_demux_eint20_27(unsigned int irq, struct irq_desc *desc)
	{
	s3c64xx_irq_demux_eint(irq, desc, 0xff00000);
	}

	static irq_flow_handler_t s3c64xx_eint0_handlers[NUM_EINT0_IRQ] = {
	s3c64xx_demux_eint0_3,
	s3c64xx_demux_eint4_11,
	s3c64xx_demux_eint12_19,
	s3c64xx_demux_eint20_27,
	};

	static int s3c64xx_eint0_irq_map(struct irq_domain *h, unsigned int virq,
	irq_hw_number_t hw)
	{
	struct s3c64xx_eint0_domain_data *ddata = h->host_data;
	struct samsung_pin_bank *bank = ddata->bank;

	if (!(bank->eint_mask & (1 << hw)))
	return -EINVAL;

	irq_set_chip_and_handler(virq,
	&s3c64xx_eint0_irq_chip, handle_level_irq);
	irq_set_chip_data(virq, ddata);
	set_irq_flags(virq, IRQF_VALID);

	return 0;
	}

	/*
	* irq domain callbacks for external wakeup interrupt controller.
	*/
	static const struct irq_domain_ops s3c64xx_eint0_irqd_ops = {
	.map = s3c64xx_eint0_irq_map,
	.xlate = irq_domain_xlate_twocell,
	};

	/* list of external wakeup controllers supported */
	static const struct of_device_id s3c64xx_eint0_irq_ids[] = {
	{ .compatible = "samsung,s3c64xx-wakeup-eint", },
	{ }
	};

	/**
	* s3c64xx_eint_eint0_init() - setup handling of external wakeup interrupts.
	* @d: driver data of samsung pinctrl driver.
	*/
	static int s3c64xx_eint_eint0_init(struct samsung_pinctrl_drv_data *d)
	{
	struct device *dev = d->dev;
	struct device_node *eint0_np = NULL;
	struct device_node *np;
	struct samsung_pin_bank *bank;
	struct s3c64xx_eint0_data *data;
	unsigned int i;

	for_each_child_of_node(dev->of_node, np) {
	if (of_match_node(s3c64xx_eint0_irq_ids, np)) {
	eint0_np = np;
	break;
	}
	}
	if (!eint0_np)
	return -ENODEV;

	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
	if (!data) {
	dev_err(dev, "could not allocate memory for wkup eint data\n");
	return -ENOMEM;
	}
	data->drvdata = d;

	for (i = 0; i < NUM_EINT0_IRQ; ++i) {
	unsigned int irq;

	irq = irq_of_parse_and_map(eint0_np, i);
	if (!irq) {
	dev_err(dev, "failed to get wakeup EINT IRQ %d\n", i);
	return -ENXIO;
	}

	irq_set_chained_handler(irq, s3c64xx_eint0_handlers[i]);
	irq_set_handler_data(irq, data);
	}

	bank = d->pin_banks;
	for (i = 0; i < d->nr_banks; ++i, ++bank) {
	struct s3c64xx_eint0_domain_data *ddata;
	unsigned int nr_eints;
	unsigned int mask;
	unsigned int irq;
	unsigned int pin;

	if (bank->eint_type != EINT_TYPE_WKUP)
	continue;

	mask = bank->eint_mask;
	nr_eints = fls(mask);

	ddata = devm_kzalloc(dev,
	sizeof(*ddata) + nr_eints, GFP_KERNEL);
	if (!ddata) {
	dev_err(dev, "failed to allocate domain data\n");
	return -ENOMEM;
	}
	ddata->bank = bank;

	bank->irq_domain = irq_domain_add_linear(bank->of_node,
	nr_eints, &s3c64xx_eint0_irqd_ops, ddata);
	if (!bank->irq_domain) {
	dev_err(dev, "wkup irq domain add failed\n");
	return -ENXIO;
	}

	irq = bank->eint_offset;
	mask = bank->eint_mask;
	for (pin = 0; mask; ++pin, mask >>= 1) {
	if (!(mask & 1))
	continue;
	data->domains[irq] = bank->irq_domain;
	data->pins[irq] = pin;
	ddata->eints[pin] = irq;
	++irq;
	}
	}

	return 0;
	}

	/* pin banks of s3c64xx pin-controller 0 */
	static const struct samsung_pin_bank_data s3c64xx_pin_banks0[] __initconst = {
	PIN_BANK_4BIT_EINTG(8, 0x000, "gpa", 0),
	PIN_BANK_4BIT_EINTG(7, 0x020, "gpb", 8),
	PIN_BANK_4BIT_EINTG(8, 0x040, "gpc", 16),
	PIN_BANK_4BIT_EINTG(5, 0x060, "gpd", 32),
	PIN_BANK_4BIT(5, 0x080, "gpe"),
	PIN_BANK_2BIT_EINTG(16, 0x0a0, "gpf", 48, 0x3fff),
	PIN_BANK_4BIT_EINTG(7, 0x0c0, "gpg", 64),
	PIN_BANK_4BIT2_EINTG(10, 0x0e0, "gph", 80),
	PIN_BANK_2BIT(16, 0x100, "gpi"),
	PIN_BANK_2BIT(12, 0x120, "gpj"),
	PIN_BANK_4BIT2_ALIVE(16, 0x800, "gpk"),
	PIN_BANK_4BIT2_EINTW(15, 0x810, "gpl", 16, 0x7f00),
	PIN_BANK_4BIT_EINTW(6, 0x820, "gpm", 23, 0x1f),
	PIN_BANK_2BIT_EINTW(16, 0x830, "gpn", 0),
	PIN_BANK_2BIT_EINTG(16, 0x140, "gpo", 96, 0xffff),
	PIN_BANK_2BIT_EINTG(15, 0x160, "gpp", 112, 0x7fff),
	PIN_BANK_2BIT_EINTG(9, 0x180, "gpq", 128, 0x1ff),
	};

	/*
	* Samsung pinctrl driver data for S3C64xx SoC. S3C64xx SoC includes
	* one gpio/pin-mux/pinconfig controller.
	*/
	const struct samsung_pin_ctrl s3c64xx_pin_ctrl[] __initconst = {
	{
	/* pin-controller instance 1 data */
	.pin_banks = s3c64xx_pin_banks0,
	.nr_banks = ARRAY_SIZE(s3c64xx_pin_banks0),
	.eint_gpio_init = s3c64xx_eint_gpio_init,
	.eint_wkup_init = s3c64xx_eint_eint0_init,
	},
	};