drivers/pinctrl/samsung/pinctrl-s3c24xx.c - kernel/msm-4.19 - Gitiles

 /*
  * S3C24XX specific support for Samsung pinctrl/gpiolib driver.
  *
  * Copyright (c) 2013 Heiko Stuebner <heiko@sntech.de>
  *
  * 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 SamsungS3C24XX specific information required by the
  * Samsung pinctrl/gpiolib driver. It also includes the implementation of
  * external gpio and wakeup interrupt support.
  */

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

 #include "pinctrl-samsung.h"

 #define NUM_EINT	24
 #define NUM_EINT_IRQ	6
 #define EINT_MAX_PER_GROUP	8

 #define EINTPEND_REG	0xa8
 #define EINTMASK_REG	0xa4

 #define EINT_GROUP(i)		((int)((i) / EINT_MAX_PER_GROUP))
 #define EINT_REG(i)		((EINT_GROUP(i) * 4) + 0x88)
 #define EINT_OFFS(i)		((i) % EINT_MAX_PER_GROUP * 4)

 #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_MASK		0xf

 static const struct samsung_pin_bank_type bank_type_1bit = {
 	.fld_width = { 1, 1, },
 	.reg_offset = { 0x00, 0x04, },
 };

 static const struct samsung_pin_bank_type bank_type_2bit = {
 	.fld_width = { 2, 1, 2, },
 	.reg_offset = { 0x00, 0x04, 0x08, },
 };

 #define PIN_BANK_A(pins, reg, id)		\
 	{						\
 		.type		= &bank_type_1bit,	\
 		.pctl_offset	= reg,			\
 		.nr_pins	= pins,			\
 		.eint_type	= EINT_TYPE_NONE,	\
 		.name		= id			\
 	}

 #define PIN_BANK_2BIT(pins, reg, id)		\
 	{						\
 		.type		= &bank_type_2bit,	\
 		.pctl_offset	= reg,			\
 		.nr_pins	= pins,			\
 		.eint_type	= EINT_TYPE_NONE,	\
 		.name		= id			\
 	}

 #define PIN_BANK_2BIT_EINTW(pins, reg, id, eoffs, emask)\
 	{						\
 		.type		= &bank_type_2bit,	\
 		.pctl_offset	= reg,			\
 		.nr_pins	= pins,			\
 		.eint_type	= EINT_TYPE_WKUP,	\
 		.eint_func	= 2,			\
 		.eint_mask	= emask,		\
 		.eint_offset	= eoffs,		\
 		.name		= id			\
 	}

 /**
  * struct s3c24xx_eint_data: EINT common data
  * @drvdata: pin controller driver data
  * @domains: IRQ domains of particular EINT interrupts
  * @parents: mapped parent irqs in the main interrupt controller
  */
 struct s3c24xx_eint_data {
 	struct samsung_pinctrl_drv_data *drvdata;
 	struct irq_domain *domains[NUM_EINT];
 	int parents[NUM_EINT_IRQ];
 };

 /**
  * struct s3c24xx_eint_domain_data: per irq-domain data
  * @bank: pin bank related to the domain
  * @eint_data: common data
  * eint0_3_parent_only: live eints 0-3 only in the main intc
  */
 struct s3c24xx_eint_domain_data {
 	struct samsung_pin_bank *bank;
 	struct s3c24xx_eint_data *eint_data;
 	bool eint0_3_parent_only;
 };

 static int s3c24xx_eint_get_trigger(unsigned int type)
 {
 	switch (type) {
 	case IRQ_TYPE_EDGE_RISING:
 		return EINT_EDGE_RISING;
 		break;
 	case IRQ_TYPE_EDGE_FALLING:
 		return EINT_EDGE_FALLING;
 		break;
 	case IRQ_TYPE_EDGE_BOTH:
 		return EINT_EDGE_BOTH;
 		break;
 	case IRQ_TYPE_LEVEL_HIGH:
 		return EINT_LEVEL_HIGH;
 		break;
 	case IRQ_TYPE_LEVEL_LOW:
 		return EINT_LEVEL_LOW;
 		break;
 	default:
 		return -EINVAL;
 	}
 }

 static void s3c24xx_eint_set_handler(struct irq_data *d, unsigned int type)
 {
 	/* Edge- and level-triggered interrupts need different handlers */
 	if (type & IRQ_TYPE_EDGE_BOTH)
 		irq_set_handler_locked(d, handle_edge_irq);
 	else
 		irq_set_handler_locked(d, handle_level_irq);
 }

 static void s3c24xx_eint_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 = bank->pctl_base + bank->pctl_offset;
 	shift = pin * 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);
 }

 static int s3c24xx_eint_type(struct irq_data *data, unsigned int type)
 {
 	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);
 	struct samsung_pinctrl_drv_data *d = bank->drvdata;
 	int index = bank->eint_offset + data->hwirq;
 	void __iomem *reg;
 	int trigger;
 	u8 shift;
 	u32 val;

 	trigger = s3c24xx_eint_get_trigger(type);
 	if (trigger < 0) {
 		dev_err(d->dev, "unsupported external interrupt type\n");
 		return -EINVAL;
 	}

 	s3c24xx_eint_set_handler(data, type);

 	/* Set up interrupt trigger */
 	reg = bank->eint_base + EINT_REG(index);
 	shift = EINT_OFFS(index);

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

 	s3c24xx_eint_set_function(d, bank, data->hwirq);

 	return 0;
 }

 /* Handling of EINTs 0-3 on all except S3C2412 and S3C2413 */

 static void s3c2410_eint0_3_ack(struct irq_data *data)
 {
 	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);
 	struct s3c24xx_eint_domain_data *ddata = bank->irq_domain->host_data;
 	struct s3c24xx_eint_data *eint_data = ddata->eint_data;
 	int parent_irq = eint_data->parents[data->hwirq];
 	struct irq_chip *parent_chip = irq_get_chip(parent_irq);

 	parent_chip->irq_ack(irq_get_irq_data(parent_irq));
 }

 static void s3c2410_eint0_3_mask(struct irq_data *data)
 {
 	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);
 	struct s3c24xx_eint_domain_data *ddata = bank->irq_domain->host_data;
 	struct s3c24xx_eint_data *eint_data = ddata->eint_data;
 	int parent_irq = eint_data->parents[data->hwirq];
 	struct irq_chip *parent_chip = irq_get_chip(parent_irq);

 	parent_chip->irq_mask(irq_get_irq_data(parent_irq));
 }

 static void s3c2410_eint0_3_unmask(struct irq_data *data)
 {
 	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);
 	struct s3c24xx_eint_domain_data *ddata = bank->irq_domain->host_data;
 	struct s3c24xx_eint_data *eint_data = ddata->eint_data;
 	int parent_irq = eint_data->parents[data->hwirq];
 	struct irq_chip *parent_chip = irq_get_chip(parent_irq);

 	parent_chip->irq_unmask(irq_get_irq_data(parent_irq));
 }

 static struct irq_chip s3c2410_eint0_3_chip = {
 	.name		= "s3c2410-eint0_3",
 	.irq_ack	= s3c2410_eint0_3_ack,
 	.irq_mask	= s3c2410_eint0_3_mask,
 	.irq_unmask	= s3c2410_eint0_3_unmask,
 	.irq_set_type	= s3c24xx_eint_type,
 };

 static void s3c2410_demux_eint0_3(struct irq_desc *desc)
 {
 	struct irq_data *data = irq_desc_get_irq_data(desc);
 	struct s3c24xx_eint_data *eint_data = irq_desc_get_handler_data(desc);
 	unsigned int virq;

 	/* the first 4 eints have a simple 1 to 1 mapping */
 	virq = irq_linear_revmap(eint_data->domains[data->hwirq], data->hwirq);
 	/* Something must be really wrong if an unmapped EINT is unmasked */
 	BUG_ON(!virq);

 	generic_handle_irq(virq);
 }

 /* Handling of EINTs 0-3 on S3C2412 and S3C2413 */

 static void s3c2412_eint0_3_ack(struct irq_data *data)
 {
 	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);

 	unsigned long bitval = 1UL << data->hwirq;
 	writel(bitval, bank->eint_base + EINTPEND_REG);
 }

 static void s3c2412_eint0_3_mask(struct irq_data *data)
 {
 	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);
 	unsigned long mask;

 	mask = readl(bank->eint_base + EINTMASK_REG);
 	mask |= (1UL << data->hwirq);
 	writel(mask, bank->eint_base + EINTMASK_REG);
 }

 static void s3c2412_eint0_3_unmask(struct irq_data *data)
 {
 	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);
 	unsigned long mask;

 	mask = readl(bank->eint_base + EINTMASK_REG);
 	mask &= ~(1UL << data->hwirq);
 	writel(mask, bank->eint_base + EINTMASK_REG);
 }

 static struct irq_chip s3c2412_eint0_3_chip = {
 	.name		= "s3c2412-eint0_3",
 	.irq_ack	= s3c2412_eint0_3_ack,
 	.irq_mask	= s3c2412_eint0_3_mask,
 	.irq_unmask	= s3c2412_eint0_3_unmask,
 	.irq_set_type	= s3c24xx_eint_type,
 };

 static void s3c2412_demux_eint0_3(struct irq_desc *desc)
 {
 	struct s3c24xx_eint_data *eint_data = irq_desc_get_handler_data(desc);
 	struct irq_data *data = irq_desc_get_irq_data(desc);
 	struct irq_chip *chip = irq_data_get_irq_chip(data);
 	unsigned int virq;

 	chained_irq_enter(chip, desc);

 	/* the first 4 eints have a simple 1 to 1 mapping */
 	virq = irq_linear_revmap(eint_data->domains[data->hwirq], data->hwirq);
 	/* Something must be really wrong if an unmapped EINT is unmasked */
 	BUG_ON(!virq);

 	generic_handle_irq(virq);

 	chained_irq_exit(chip, desc);
 }

 /* Handling of all other eints */

 static void s3c24xx_eint_ack(struct irq_data *data)
 {
 	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);
 	unsigned char index = bank->eint_offset + data->hwirq;

 	writel(1UL << index, bank->eint_base + EINTPEND_REG);
 }

 static void s3c24xx_eint_mask(struct irq_data *data)
 {
 	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);
 	unsigned char index = bank->eint_offset + data->hwirq;
 	unsigned long mask;

 	mask = readl(bank->eint_base + EINTMASK_REG);
 	mask |= (1UL << index);
 	writel(mask, bank->eint_base + EINTMASK_REG);
 }

 static void s3c24xx_eint_unmask(struct irq_data *data)
 {
 	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);
 	unsigned char index = bank->eint_offset + data->hwirq;
 	unsigned long mask;

 	mask = readl(bank->eint_base + EINTMASK_REG);
 	mask &= ~(1UL << index);
 	writel(mask, bank->eint_base + EINTMASK_REG);
 }

 static struct irq_chip s3c24xx_eint_chip = {
 	.name		= "s3c-eint",
 	.irq_ack	= s3c24xx_eint_ack,
 	.irq_mask	= s3c24xx_eint_mask,
 	.irq_unmask	= s3c24xx_eint_unmask,
 	.irq_set_type	= s3c24xx_eint_type,
 };

 static inline void s3c24xx_demux_eint(struct irq_desc *desc,
 				      u32 offset, u32 range)
 {
 	struct s3c24xx_eint_data *data = irq_desc_get_handler_data(desc);
 	struct irq_chip *chip = irq_desc_get_chip(desc);
 	struct irq_data *irqd = irq_desc_get_irq_data(desc);
 	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
 	unsigned int pend, mask;

 	chained_irq_enter(chip, desc);

 	pend = readl(bank->eint_base + EINTPEND_REG);
 	mask = readl(bank->eint_base + EINTMASK_REG);

 	pend &= ~mask;
 	pend &= range;

 	while (pend) {
 		unsigned int virq, irq;

 		irq = __ffs(pend);
 		pend &= ~(1 << irq);
 		virq = irq_linear_revmap(data->domains[irq], irq - offset);
 		/* Something is really wrong if an unmapped EINT is unmasked */
 		BUG_ON(!virq);

 		generic_handle_irq(virq);
 	}

 	chained_irq_exit(chip, desc);
 }

 static void s3c24xx_demux_eint4_7(struct irq_desc *desc)
 {
 	s3c24xx_demux_eint(desc, 0, 0xf0);
 }

 static void s3c24xx_demux_eint8_23(struct irq_desc *desc)
 {
 	s3c24xx_demux_eint(desc, 8, 0xffff00);
 }

 static irq_flow_handler_t s3c2410_eint_handlers[NUM_EINT_IRQ] = {
 	s3c2410_demux_eint0_3,
 	s3c2410_demux_eint0_3,
 	s3c2410_demux_eint0_3,
 	s3c2410_demux_eint0_3,
 	s3c24xx_demux_eint4_7,
 	s3c24xx_demux_eint8_23,
 };

 static irq_flow_handler_t s3c2412_eint_handlers[NUM_EINT_IRQ] = {
 	s3c2412_demux_eint0_3,
 	s3c2412_demux_eint0_3,
 	s3c2412_demux_eint0_3,
 	s3c2412_demux_eint0_3,
 	s3c24xx_demux_eint4_7,
 	s3c24xx_demux_eint8_23,
 };

 static int s3c24xx_gpf_irq_map(struct irq_domain *h, unsigned int virq,
 					irq_hw_number_t hw)
 {
 	struct s3c24xx_eint_domain_data *ddata = h->host_data;
 	struct samsung_pin_bank *bank = ddata->bank;

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

 	if (hw <= 3) {
 		if (ddata->eint0_3_parent_only)
 			irq_set_chip_and_handler(virq, &s3c2410_eint0_3_chip,
 						 handle_edge_irq);
 		else
 			irq_set_chip_and_handler(virq, &s3c2412_eint0_3_chip,
 						 handle_edge_irq);
 	} else {
 		irq_set_chip_and_handler(virq, &s3c24xx_eint_chip,
 					 handle_edge_irq);
 	}
 	irq_set_chip_data(virq, bank);
 	return 0;
 }

 static const struct irq_domain_ops s3c24xx_gpf_irq_ops = {
 	.map	= s3c24xx_gpf_irq_map,
 	.xlate	= irq_domain_xlate_twocell,
 };

 static int s3c24xx_gpg_irq_map(struct irq_domain *h, unsigned int virq,
 					irq_hw_number_t hw)
 {
 	struct s3c24xx_eint_domain_data *ddata = h->host_data;
 	struct samsung_pin_bank *bank = ddata->bank;

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

 	irq_set_chip_and_handler(virq, &s3c24xx_eint_chip, handle_edge_irq);
 	irq_set_chip_data(virq, bank);
 	return 0;
 }

 static const struct irq_domain_ops s3c24xx_gpg_irq_ops = {
 	.map	= s3c24xx_gpg_irq_map,
 	.xlate	= irq_domain_xlate_twocell,
 };

 static const struct of_device_id s3c24xx_eint_irq_ids[] = {
 	{ .compatible = "samsung,s3c2410-wakeup-eint", .data = (void *)1 },
 	{ .compatible = "samsung,s3c2412-wakeup-eint", .data = (void *)0 },
 	{ }
 };

 static int s3c24xx_eint_init(struct samsung_pinctrl_drv_data *d)
 {
 	struct device *dev = d->dev;
 	const struct of_device_id *match;
 	struct device_node *eint_np = NULL;
 	struct device_node *np;
 	struct samsung_pin_bank *bank;
 	struct s3c24xx_eint_data *eint_data;
 	const struct irq_domain_ops *ops;
 	unsigned int i;
 	bool eint0_3_parent_only;
 	irq_flow_handler_t *handlers;

 	for_each_child_of_node(dev->of_node, np) {
 		match = of_match_node(s3c24xx_eint_irq_ids, np);
 		if (match) {
 			eint_np = np;
 			eint0_3_parent_only = (bool)match->data;
 			break;
 		}
 	}
 	if (!eint_np)
 		return -ENODEV;

 	eint_data = devm_kzalloc(dev, sizeof(*eint_data), GFP_KERNEL);
 	if (!eint_data)
 		return -ENOMEM;

 	eint_data->drvdata = d;

 	handlers = eint0_3_parent_only ? s3c2410_eint_handlers
 				       : s3c2412_eint_handlers;
 	for (i = 0; i < NUM_EINT_IRQ; ++i) {
 		unsigned int irq;

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

 		eint_data->parents[i] = irq;
 		irq_set_chained_handler_and_data(irq, handlers[i], eint_data);
 	}

 	bank = d->pin_banks;
 	for (i = 0; i < d->nr_banks; ++i, ++bank) {
 		struct s3c24xx_eint_domain_data *ddata;
 		unsigned int mask;
 		unsigned int irq;
 		unsigned int pin;

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

 		ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
 		if (!ddata)
 			return -ENOMEM;

 		ddata->bank = bank;
 		ddata->eint_data = eint_data;
 		ddata->eint0_3_parent_only = eint0_3_parent_only;

 		ops = (bank->eint_offset == 0) ? &s3c24xx_gpf_irq_ops
 					       : &s3c24xx_gpg_irq_ops;

 		bank->irq_domain = irq_domain_add_linear(bank->of_node,
 				bank->nr_pins, 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 (irq >= NUM_EINT)
 				break;
 			if (!(mask & 1))
 				continue;
 			eint_data->domains[irq] = bank->irq_domain;
 			++irq;
 		}
 	}

 	return 0;
 }

 static const struct samsung_pin_bank_data s3c2412_pin_banks[] __initconst = {
 	PIN_BANK_A(23, 0x000, "gpa"),
 	PIN_BANK_2BIT(11, 0x010, "gpb"),
 	PIN_BANK_2BIT(16, 0x020, "gpc"),
 	PIN_BANK_2BIT(16, 0x030, "gpd"),
 	PIN_BANK_2BIT(16, 0x040, "gpe"),
 	PIN_BANK_2BIT_EINTW(8, 0x050, "gpf", 0, 0xff),
 	PIN_BANK_2BIT_EINTW(16, 0x060, "gpg", 8, 0xffff00),
 	PIN_BANK_2BIT(11, 0x070, "gph"),
 	PIN_BANK_2BIT(13, 0x080, "gpj"),
 };

 const struct samsung_pin_ctrl s3c2412_pin_ctrl[] __initconst = {
 	{
 		.pin_banks	= s3c2412_pin_banks,
 		.nr_banks	= ARRAY_SIZE(s3c2412_pin_banks),
 		.eint_wkup_init = s3c24xx_eint_init,
 	},
 };

 static const struct samsung_pin_bank_data s3c2416_pin_banks[] __initconst = {
 	PIN_BANK_A(27, 0x000, "gpa"),
 	PIN_BANK_2BIT(11, 0x010, "gpb"),
 	PIN_BANK_2BIT(16, 0x020, "gpc"),
 	PIN_BANK_2BIT(16, 0x030, "gpd"),
 	PIN_BANK_2BIT(16, 0x040, "gpe"),
 	PIN_BANK_2BIT_EINTW(8, 0x050, "gpf", 0, 0xff),
 	PIN_BANK_2BIT_EINTW(8, 0x060, "gpg", 8, 0xff00),
 	PIN_BANK_2BIT(15, 0x070, "gph"),
 	PIN_BANK_2BIT(16, 0x0e0, "gpk"),
 	PIN_BANK_2BIT(14, 0x0f0, "gpl"),
 	PIN_BANK_2BIT(2, 0x100, "gpm"),
 };

 const struct samsung_pin_ctrl s3c2416_pin_ctrl[] __initconst = {
 	{
 		.pin_banks	= s3c2416_pin_banks,
 		.nr_banks	= ARRAY_SIZE(s3c2416_pin_banks),
 		.eint_wkup_init = s3c24xx_eint_init,
 	},
 };

 static const struct samsung_pin_bank_data s3c2440_pin_banks[] __initconst = {
 	PIN_BANK_A(25, 0x000, "gpa"),
 	PIN_BANK_2BIT(11, 0x010, "gpb"),
 	PIN_BANK_2BIT(16, 0x020, "gpc"),
 	PIN_BANK_2BIT(16, 0x030, "gpd"),
 	PIN_BANK_2BIT(16, 0x040, "gpe"),
 	PIN_BANK_2BIT_EINTW(8, 0x050, "gpf", 0, 0xff),
 	PIN_BANK_2BIT_EINTW(16, 0x060, "gpg", 8, 0xffff00),
 	PIN_BANK_2BIT(11, 0x070, "gph"),
 	PIN_BANK_2BIT(13, 0x0d0, "gpj"),
 };

 const struct samsung_pin_ctrl s3c2440_pin_ctrl[] __initconst = {
 	{
 		.pin_banks	= s3c2440_pin_banks,
 		.nr_banks	= ARRAY_SIZE(s3c2440_pin_banks),
 		.eint_wkup_init = s3c24xx_eint_init,
 	},
 };

 static const struct samsung_pin_bank_data s3c2450_pin_banks[] __initconst = {
 	PIN_BANK_A(28, 0x000, "gpa"),
 	PIN_BANK_2BIT(11, 0x010, "gpb"),
 	PIN_BANK_2BIT(16, 0x020, "gpc"),
 	PIN_BANK_2BIT(16, 0x030, "gpd"),
 	PIN_BANK_2BIT(16, 0x040, "gpe"),
 	PIN_BANK_2BIT_EINTW(8, 0x050, "gpf", 0, 0xff),
 	PIN_BANK_2BIT_EINTW(16, 0x060, "gpg", 8, 0xffff00),
 	PIN_BANK_2BIT(15, 0x070, "gph"),
 	PIN_BANK_2BIT(16, 0x0d0, "gpj"),
 	PIN_BANK_2BIT(16, 0x0e0, "gpk"),
 	PIN_BANK_2BIT(15, 0x0f0, "gpl"),
 	PIN_BANK_2BIT(2, 0x100, "gpm"),
 };

 const struct samsung_pin_ctrl s3c2450_pin_ctrl[] __initconst = {
 	{
 		.pin_banks	= s3c2450_pin_banks,
 		.nr_banks	= ARRAY_SIZE(s3c2450_pin_banks),
 		.eint_wkup_init = s3c24xx_eint_init,
 	},
 };
	/*
	* S3C24XX specific support for Samsung pinctrl/gpiolib driver.
	*
	* Copyright (c) 2013 Heiko Stuebner <heiko@sntech.de>
	*
	* 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 SamsungS3C24XX specific information required by the
	* Samsung pinctrl/gpiolib driver. It also includes the implementation of
	* external gpio and wakeup interrupt support.
	*/

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

	#include "pinctrl-samsung.h"

	#define NUM_EINT 24
	#define NUM_EINT_IRQ 6
	#define EINT_MAX_PER_GROUP 8

	#define EINTPEND_REG 0xa8
	#define EINTMASK_REG 0xa4

	#define EINT_GROUP(i) ((int)((i) / EINT_MAX_PER_GROUP))
	#define EINT_REG(i) ((EINT_GROUP(i) * 4) + 0x88)
	#define EINT_OFFS(i) ((i) % EINT_MAX_PER_GROUP * 4)

	#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_MASK 0xf

	static const struct samsung_pin_bank_type bank_type_1bit = {
	.fld_width = { 1, 1, },
	.reg_offset = { 0x00, 0x04, },
	};

	static const struct samsung_pin_bank_type bank_type_2bit = {
	.fld_width = { 2, 1, 2, },
	.reg_offset = { 0x00, 0x04, 0x08, },
	};

	#define PIN_BANK_A(pins, reg, id) \
	{ \
	.type = &bank_type_1bit, \
	.pctl_offset = reg, \
	.nr_pins = pins, \
	.eint_type = EINT_TYPE_NONE, \
	.name = id \
	}

	#define PIN_BANK_2BIT(pins, reg, id) \
	{ \
	.type = &bank_type_2bit, \
	.pctl_offset = reg, \
	.nr_pins = pins, \
	.eint_type = EINT_TYPE_NONE, \
	.name = id \
	}

	#define PIN_BANK_2BIT_EINTW(pins, reg, id, eoffs, emask)\
	{ \
	.type = &bank_type_2bit, \
	.pctl_offset = reg, \
	.nr_pins = pins, \
	.eint_type = EINT_TYPE_WKUP, \
	.eint_func = 2, \
	.eint_mask = emask, \
	.eint_offset = eoffs, \
	.name = id \
	}

	/**
	* struct s3c24xx_eint_data: EINT common data
	* @drvdata: pin controller driver data
	* @domains: IRQ domains of particular EINT interrupts
	* @parents: mapped parent irqs in the main interrupt controller
	*/
	struct s3c24xx_eint_data {
	struct samsung_pinctrl_drv_data *drvdata;
	struct irq_domain *domains[NUM_EINT];
	int parents[NUM_EINT_IRQ];
	};

	/**
	* struct s3c24xx_eint_domain_data: per irq-domain data
	* @bank: pin bank related to the domain
	* @eint_data: common data
	* eint0_3_parent_only: live eints 0-3 only in the main intc
	*/
	struct s3c24xx_eint_domain_data {
	struct samsung_pin_bank *bank;
	struct s3c24xx_eint_data *eint_data;
	bool eint0_3_parent_only;
	};

	static int s3c24xx_eint_get_trigger(unsigned int type)
	{
	switch (type) {
	case IRQ_TYPE_EDGE_RISING:
	return EINT_EDGE_RISING;
	break;
	case IRQ_TYPE_EDGE_FALLING:
	return EINT_EDGE_FALLING;
	break;
	case IRQ_TYPE_EDGE_BOTH:
	return EINT_EDGE_BOTH;
	break;
	case IRQ_TYPE_LEVEL_HIGH:
	return EINT_LEVEL_HIGH;
	break;
	case IRQ_TYPE_LEVEL_LOW:
	return EINT_LEVEL_LOW;
	break;
	default:
	return -EINVAL;
	}
	}

	static void s3c24xx_eint_set_handler(struct irq_data *d, unsigned int type)
	{
	/* Edge- and level-triggered interrupts need different handlers */
	if (type & IRQ_TYPE_EDGE_BOTH)
	irq_set_handler_locked(d, handle_edge_irq);
	else
	irq_set_handler_locked(d, handle_level_irq);
	}

	static void s3c24xx_eint_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 = bank->pctl_base + bank->pctl_offset;
	shift = pin * 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);
	}

	static int s3c24xx_eint_type(struct irq_data *data, unsigned int type)
	{
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);
	struct samsung_pinctrl_drv_data *d = bank->drvdata;
	int index = bank->eint_offset + data->hwirq;
	void __iomem *reg;
	int trigger;
	u8 shift;
	u32 val;

	trigger = s3c24xx_eint_get_trigger(type);
	if (trigger < 0) {
	dev_err(d->dev, "unsupported external interrupt type\n");
	return -EINVAL;
	}

	s3c24xx_eint_set_handler(data, type);

	/* Set up interrupt trigger */
	reg = bank->eint_base + EINT_REG(index);
	shift = EINT_OFFS(index);

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

	s3c24xx_eint_set_function(d, bank, data->hwirq);

	return 0;
	}

	/* Handling of EINTs 0-3 on all except S3C2412 and S3C2413 */

	static void s3c2410_eint0_3_ack(struct irq_data *data)
	{
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);
	struct s3c24xx_eint_domain_data *ddata = bank->irq_domain->host_data;
	struct s3c24xx_eint_data *eint_data = ddata->eint_data;
	int parent_irq = eint_data->parents[data->hwirq];
	struct irq_chip *parent_chip = irq_get_chip(parent_irq);

	parent_chip->irq_ack(irq_get_irq_data(parent_irq));
	}

	static void s3c2410_eint0_3_mask(struct irq_data *data)
	{
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);
	struct s3c24xx_eint_domain_data *ddata = bank->irq_domain->host_data;
	struct s3c24xx_eint_data *eint_data = ddata->eint_data;
	int parent_irq = eint_data->parents[data->hwirq];
	struct irq_chip *parent_chip = irq_get_chip(parent_irq);

	parent_chip->irq_mask(irq_get_irq_data(parent_irq));
	}

	static void s3c2410_eint0_3_unmask(struct irq_data *data)
	{
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);
	struct s3c24xx_eint_domain_data *ddata = bank->irq_domain->host_data;
	struct s3c24xx_eint_data *eint_data = ddata->eint_data;
	int parent_irq = eint_data->parents[data->hwirq];
	struct irq_chip *parent_chip = irq_get_chip(parent_irq);

	parent_chip->irq_unmask(irq_get_irq_data(parent_irq));
	}

	static struct irq_chip s3c2410_eint0_3_chip = {
	.name = "s3c2410-eint0_3",
	.irq_ack = s3c2410_eint0_3_ack,
	.irq_mask = s3c2410_eint0_3_mask,
	.irq_unmask = s3c2410_eint0_3_unmask,
	.irq_set_type = s3c24xx_eint_type,
	};

	static void s3c2410_demux_eint0_3(struct irq_desc *desc)
	{
	struct irq_data *data = irq_desc_get_irq_data(desc);
	struct s3c24xx_eint_data *eint_data = irq_desc_get_handler_data(desc);
	unsigned int virq;

	/* the first 4 eints have a simple 1 to 1 mapping */
	virq = irq_linear_revmap(eint_data->domains[data->hwirq], data->hwirq);
	/* Something must be really wrong if an unmapped EINT is unmasked */
	BUG_ON(!virq);

	generic_handle_irq(virq);
	}

	/* Handling of EINTs 0-3 on S3C2412 and S3C2413 */

	static void s3c2412_eint0_3_ack(struct irq_data *data)
	{
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);

	unsigned long bitval = 1UL << data->hwirq;
	writel(bitval, bank->eint_base + EINTPEND_REG);
	}

	static void s3c2412_eint0_3_mask(struct irq_data *data)
	{
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);
	unsigned long mask;

	mask = readl(bank->eint_base + EINTMASK_REG);
	mask \|= (1UL << data->hwirq);
	writel(mask, bank->eint_base + EINTMASK_REG);
	}

	static void s3c2412_eint0_3_unmask(struct irq_data *data)
	{
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);
	unsigned long mask;

	mask = readl(bank->eint_base + EINTMASK_REG);
	mask &= ~(1UL << data->hwirq);
	writel(mask, bank->eint_base + EINTMASK_REG);
	}

	static struct irq_chip s3c2412_eint0_3_chip = {
	.name = "s3c2412-eint0_3",
	.irq_ack = s3c2412_eint0_3_ack,
	.irq_mask = s3c2412_eint0_3_mask,
	.irq_unmask = s3c2412_eint0_3_unmask,
	.irq_set_type = s3c24xx_eint_type,
	};

	static void s3c2412_demux_eint0_3(struct irq_desc *desc)
	{
	struct s3c24xx_eint_data *eint_data = irq_desc_get_handler_data(desc);
	struct irq_data *data = irq_desc_get_irq_data(desc);
	struct irq_chip *chip = irq_data_get_irq_chip(data);
	unsigned int virq;

	chained_irq_enter(chip, desc);

	/* the first 4 eints have a simple 1 to 1 mapping */
	virq = irq_linear_revmap(eint_data->domains[data->hwirq], data->hwirq);
	/* Something must be really wrong if an unmapped EINT is unmasked */
	BUG_ON(!virq);

	generic_handle_irq(virq);

	chained_irq_exit(chip, desc);
	}

	/* Handling of all other eints */

	static void s3c24xx_eint_ack(struct irq_data *data)
	{
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);
	unsigned char index = bank->eint_offset + data->hwirq;

	writel(1UL << index, bank->eint_base + EINTPEND_REG);
	}

	static void s3c24xx_eint_mask(struct irq_data *data)
	{
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);
	unsigned char index = bank->eint_offset + data->hwirq;
	unsigned long mask;

	mask = readl(bank->eint_base + EINTMASK_REG);
	mask \|= (1UL << index);
	writel(mask, bank->eint_base + EINTMASK_REG);
	}

	static void s3c24xx_eint_unmask(struct irq_data *data)
	{
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(data);
	unsigned char index = bank->eint_offset + data->hwirq;
	unsigned long mask;

	mask = readl(bank->eint_base + EINTMASK_REG);
	mask &= ~(1UL << index);
	writel(mask, bank->eint_base + EINTMASK_REG);
	}

	static struct irq_chip s3c24xx_eint_chip = {
	.name = "s3c-eint",
	.irq_ack = s3c24xx_eint_ack,
	.irq_mask = s3c24xx_eint_mask,
	.irq_unmask = s3c24xx_eint_unmask,
	.irq_set_type = s3c24xx_eint_type,
	};

	static inline void s3c24xx_demux_eint(struct irq_desc *desc,
	u32 offset, u32 range)
	{
	struct s3c24xx_eint_data *data = irq_desc_get_handler_data(desc);
	struct irq_chip *chip = irq_desc_get_chip(desc);
	struct irq_data *irqd = irq_desc_get_irq_data(desc);
	struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
	unsigned int pend, mask;

	chained_irq_enter(chip, desc);

	pend = readl(bank->eint_base + EINTPEND_REG);
	mask = readl(bank->eint_base + EINTMASK_REG);

	pend &= ~mask;
	pend &= range;

	while (pend) {
	unsigned int virq, irq;

	irq = __ffs(pend);
	pend &= ~(1 << irq);
	virq = irq_linear_revmap(data->domains[irq], irq - offset);
	/* Something is really wrong if an unmapped EINT is unmasked */
	BUG_ON(!virq);

	generic_handle_irq(virq);
	}

	chained_irq_exit(chip, desc);
	}

	static void s3c24xx_demux_eint4_7(struct irq_desc *desc)
	{
	s3c24xx_demux_eint(desc, 0, 0xf0);
	}

	static void s3c24xx_demux_eint8_23(struct irq_desc *desc)
	{
	s3c24xx_demux_eint(desc, 8, 0xffff00);
	}

	static irq_flow_handler_t s3c2410_eint_handlers[NUM_EINT_IRQ] = {
	s3c2410_demux_eint0_3,
	s3c2410_demux_eint0_3,
	s3c2410_demux_eint0_3,
	s3c2410_demux_eint0_3,
	s3c24xx_demux_eint4_7,
	s3c24xx_demux_eint8_23,
	};

	static irq_flow_handler_t s3c2412_eint_handlers[NUM_EINT_IRQ] = {
	s3c2412_demux_eint0_3,
	s3c2412_demux_eint0_3,
	s3c2412_demux_eint0_3,
	s3c2412_demux_eint0_3,
	s3c24xx_demux_eint4_7,
	s3c24xx_demux_eint8_23,
	};

	static int s3c24xx_gpf_irq_map(struct irq_domain *h, unsigned int virq,
	irq_hw_number_t hw)
	{
	struct s3c24xx_eint_domain_data *ddata = h->host_data;
	struct samsung_pin_bank *bank = ddata->bank;

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

	if (hw <= 3) {
	if (ddata->eint0_3_parent_only)
	irq_set_chip_and_handler(virq, &s3c2410_eint0_3_chip,
	handle_edge_irq);
	else
	irq_set_chip_and_handler(virq, &s3c2412_eint0_3_chip,
	handle_edge_irq);
	} else {
	irq_set_chip_and_handler(virq, &s3c24xx_eint_chip,
	handle_edge_irq);
	}
	irq_set_chip_data(virq, bank);
	return 0;
	}

	static const struct irq_domain_ops s3c24xx_gpf_irq_ops = {
	.map = s3c24xx_gpf_irq_map,
	.xlate = irq_domain_xlate_twocell,
	};

	static int s3c24xx_gpg_irq_map(struct irq_domain *h, unsigned int virq,
	irq_hw_number_t hw)
	{
	struct s3c24xx_eint_domain_data *ddata = h->host_data;
	struct samsung_pin_bank *bank = ddata->bank;

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

	irq_set_chip_and_handler(virq, &s3c24xx_eint_chip, handle_edge_irq);
	irq_set_chip_data(virq, bank);
	return 0;
	}

	static const struct irq_domain_ops s3c24xx_gpg_irq_ops = {
	.map = s3c24xx_gpg_irq_map,
	.xlate = irq_domain_xlate_twocell,
	};

	static const struct of_device_id s3c24xx_eint_irq_ids[] = {
	{ .compatible = "samsung,s3c2410-wakeup-eint", .data = (void *)1 },
	{ .compatible = "samsung,s3c2412-wakeup-eint", .data = (void *)0 },
	{ }
	};

	static int s3c24xx_eint_init(struct samsung_pinctrl_drv_data *d)
	{
	struct device *dev = d->dev;
	const struct of_device_id *match;
	struct device_node *eint_np = NULL;
	struct device_node *np;
	struct samsung_pin_bank *bank;
	struct s3c24xx_eint_data *eint_data;
	const struct irq_domain_ops *ops;
	unsigned int i;
	bool eint0_3_parent_only;
	irq_flow_handler_t *handlers;

	for_each_child_of_node(dev->of_node, np) {
	match = of_match_node(s3c24xx_eint_irq_ids, np);
	if (match) {
	eint_np = np;
	eint0_3_parent_only = (bool)match->data;
	break;
	}
	}
	if (!eint_np)
	return -ENODEV;

	eint_data = devm_kzalloc(dev, sizeof(*eint_data), GFP_KERNEL);
	if (!eint_data)
	return -ENOMEM;

	eint_data->drvdata = d;

	handlers = eint0_3_parent_only ? s3c2410_eint_handlers
	: s3c2412_eint_handlers;
	for (i = 0; i < NUM_EINT_IRQ; ++i) {
	unsigned int irq;

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

	eint_data->parents[i] = irq;
	irq_set_chained_handler_and_data(irq, handlers[i], eint_data);
	}

	bank = d->pin_banks;
	for (i = 0; i < d->nr_banks; ++i, ++bank) {
	struct s3c24xx_eint_domain_data *ddata;
	unsigned int mask;
	unsigned int irq;
	unsigned int pin;

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

	ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
	if (!ddata)
	return -ENOMEM;

	ddata->bank = bank;
	ddata->eint_data = eint_data;
	ddata->eint0_3_parent_only = eint0_3_parent_only;

	ops = (bank->eint_offset == 0) ? &s3c24xx_gpf_irq_ops
	: &s3c24xx_gpg_irq_ops;

	bank->irq_domain = irq_domain_add_linear(bank->of_node,
	bank->nr_pins, 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 (irq >= NUM_EINT)
	break;
	if (!(mask & 1))
	continue;
	eint_data->domains[irq] = bank->irq_domain;
	++irq;
	}
	}

	return 0;
	}

	static const struct samsung_pin_bank_data s3c2412_pin_banks[] __initconst = {
	PIN_BANK_A(23, 0x000, "gpa"),
	PIN_BANK_2BIT(11, 0x010, "gpb"),
	PIN_BANK_2BIT(16, 0x020, "gpc"),
	PIN_BANK_2BIT(16, 0x030, "gpd"),
	PIN_BANK_2BIT(16, 0x040, "gpe"),
	PIN_BANK_2BIT_EINTW(8, 0x050, "gpf", 0, 0xff),
	PIN_BANK_2BIT_EINTW(16, 0x060, "gpg", 8, 0xffff00),
	PIN_BANK_2BIT(11, 0x070, "gph"),
	PIN_BANK_2BIT(13, 0x080, "gpj"),
	};

	const struct samsung_pin_ctrl s3c2412_pin_ctrl[] __initconst = {
	{
	.pin_banks = s3c2412_pin_banks,
	.nr_banks = ARRAY_SIZE(s3c2412_pin_banks),
	.eint_wkup_init = s3c24xx_eint_init,
	},
	};

	static const struct samsung_pin_bank_data s3c2416_pin_banks[] __initconst = {
	PIN_BANK_A(27, 0x000, "gpa"),
	PIN_BANK_2BIT(11, 0x010, "gpb"),
	PIN_BANK_2BIT(16, 0x020, "gpc"),
	PIN_BANK_2BIT(16, 0x030, "gpd"),
	PIN_BANK_2BIT(16, 0x040, "gpe"),
	PIN_BANK_2BIT_EINTW(8, 0x050, "gpf", 0, 0xff),
	PIN_BANK_2BIT_EINTW(8, 0x060, "gpg", 8, 0xff00),
	PIN_BANK_2BIT(15, 0x070, "gph"),
	PIN_BANK_2BIT(16, 0x0e0, "gpk"),
	PIN_BANK_2BIT(14, 0x0f0, "gpl"),
	PIN_BANK_2BIT(2, 0x100, "gpm"),
	};

	const struct samsung_pin_ctrl s3c2416_pin_ctrl[] __initconst = {
	{
	.pin_banks = s3c2416_pin_banks,
	.nr_banks = ARRAY_SIZE(s3c2416_pin_banks),
	.eint_wkup_init = s3c24xx_eint_init,
	},
	};

	static const struct samsung_pin_bank_data s3c2440_pin_banks[] __initconst = {
	PIN_BANK_A(25, 0x000, "gpa"),
	PIN_BANK_2BIT(11, 0x010, "gpb"),
	PIN_BANK_2BIT(16, 0x020, "gpc"),
	PIN_BANK_2BIT(16, 0x030, "gpd"),
	PIN_BANK_2BIT(16, 0x040, "gpe"),
	PIN_BANK_2BIT_EINTW(8, 0x050, "gpf", 0, 0xff),
	PIN_BANK_2BIT_EINTW(16, 0x060, "gpg", 8, 0xffff00),
	PIN_BANK_2BIT(11, 0x070, "gph"),
	PIN_BANK_2BIT(13, 0x0d0, "gpj"),
	};

	const struct samsung_pin_ctrl s3c2440_pin_ctrl[] __initconst = {
	{
	.pin_banks = s3c2440_pin_banks,
	.nr_banks = ARRAY_SIZE(s3c2440_pin_banks),
	.eint_wkup_init = s3c24xx_eint_init,
	},
	};

	static const struct samsung_pin_bank_data s3c2450_pin_banks[] __initconst = {
	PIN_BANK_A(28, 0x000, "gpa"),
	PIN_BANK_2BIT(11, 0x010, "gpb"),
	PIN_BANK_2BIT(16, 0x020, "gpc"),
	PIN_BANK_2BIT(16, 0x030, "gpd"),
	PIN_BANK_2BIT(16, 0x040, "gpe"),
	PIN_BANK_2BIT_EINTW(8, 0x050, "gpf", 0, 0xff),
	PIN_BANK_2BIT_EINTW(16, 0x060, "gpg", 8, 0xffff00),
	PIN_BANK_2BIT(15, 0x070, "gph"),
	PIN_BANK_2BIT(16, 0x0d0, "gpj"),
	PIN_BANK_2BIT(16, 0x0e0, "gpk"),
	PIN_BANK_2BIT(15, 0x0f0, "gpl"),
	PIN_BANK_2BIT(2, 0x100, "gpm"),
	};

	const struct samsung_pin_ctrl s3c2450_pin_ctrl[] __initconst = {
	{
	.pin_banks = s3c2450_pin_banks,
	.nr_banks = ARRAY_SIZE(s3c2450_pin_banks),
	.eint_wkup_init = s3c24xx_eint_init,
	},
	};