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

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

static 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 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)
{
        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->ctrl->pin_banks;
        for (i = 0; i < d->ctrl->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->ctrl->pin_banks;
        nr_domains = 0;
        for (i = 0; i < d->ctrl->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->ctrl->pin_banks;
        for (i = 0; i < d->ctrl->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 struct samsung_pin_bank s3c64xx_pin_banks0[] = {
        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.
 */
struct samsung_pin_ctrl s3c64xx_pin_ctrl[] = {
        {
                /* 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,
                .label          = "S3C64xx-GPIO",
        },
};