Merge tag 'for-linus-20170825' of git://git.infradead.org/linux-mtd

[mirror_ubuntu-artful-kernel.git] / drivers / pinctrl / mvebu / pinctrl-armada-37xx.c

/*
 * Marvell 37xx SoC pinctrl driver
 *
 * Copyright (C) 2017 Marvell
 *
 * Gregory CLEMENT <gregory.clement@free-electrons.com>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2 or later. This program is licensed "as is"
 * without any warranty of any kind, whether express or implied.
 */

#include <linux/gpio/driver.h>
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>

#include "../pinctrl-utils.h"

#define OUTPUT_EN       0x0
#define INPUT_VAL       0x10
#define OUTPUT_VAL      0x18
#define OUTPUT_CTL      0x20
#define SELECTION       0x30

#define IRQ_EN          0x0
#define IRQ_POL         0x08
#define IRQ_STATUS      0x10
#define IRQ_WKUP        0x18

#define NB_FUNCS 3
#define GPIO_PER_REG    32

/**
 * struct armada_37xx_pin_group: represents group of pins of a pinmux function.
 * The pins of a pinmux groups are composed of one or two groups of contiguous
 * pins.
 * @name:       Name of the pin group, used to lookup the group.
 * @start_pins: Index of the first pin of the main range of pins belonging to
 *              the group
 * @npins:      Number of pins included in the first range
 * @reg_mask:   Bit mask matching the group in the selection register
 * @extra_pins: Index of the first pin of the optional second range of pins
 *              belonging to the group
 * @npins:      Number of pins included in the second optional range
 * @funcs:      A list of pinmux functions that can be selected for this group.
 * @pins:       List of the pins included in the group
 */
struct armada_37xx_pin_group {
        const char      *name;
        unsigned int    start_pin;
        unsigned int    npins;
        u32             reg_mask;
        u32             val[NB_FUNCS];
        unsigned int    extra_pin;
        unsigned int    extra_npins;
        const char      *funcs[NB_FUNCS];
        unsigned int    *pins;
};

struct armada_37xx_pin_data {
        u8                              nr_pins;
        char                            *name;
        struct armada_37xx_pin_group    *groups;
        int                             ngroups;
};

struct armada_37xx_pmx_func {
        const char              *name;
        const char              **groups;
        unsigned int            ngroups;
};

struct armada_37xx_pinctrl {
        struct regmap                   *regmap;
        void __iomem                    *base;
        const struct armada_37xx_pin_data       *data;
        struct device                   *dev;
        struct gpio_chip                gpio_chip;
        struct irq_chip                 irq_chip;
        spinlock_t                      irq_lock;
        struct pinctrl_desc             pctl;
        struct pinctrl_dev              *pctl_dev;
        struct armada_37xx_pin_group    *groups;
        unsigned int                    ngroups;
        struct armada_37xx_pmx_func     *funcs;
        unsigned int                    nfuncs;
};

#define PIN_GRP(_name, _start, _nr, _mask, _func1, _func2)      \
        {                                       \
                .name = _name,                  \
                .start_pin = _start,            \
                .npins = _nr,                   \
                .reg_mask = _mask,              \
                .val = {0, _mask},              \
                .funcs = {_func1, _func2}       \
        }

#define PIN_GRP_GPIO(_name, _start, _nr, _mask, _func1) \
        {                                       \
                .name = _name,                  \
                .start_pin = _start,            \
                .npins = _nr,                   \
                .reg_mask = _mask,              \
                .val = {0, _mask},              \
                .funcs = {_func1, "gpio"}       \
        }

#define PIN_GRP_GPIO_2(_name, _start, _nr, _mask, _val1, _val2, _func1)   \
        {                                       \
                .name = _name,                  \
                .start_pin = _start,            \
                .npins = _nr,                   \
                .reg_mask = _mask,              \
                .val = {_val1, _val2},          \
                .funcs = {_func1, "gpio"}       \
        }

#define PIN_GRP_GPIO_3(_name, _start, _nr, _mask, _v1, _v2, _v3, _f1, _f2) \
        {                                       \
                .name = _name,                  \
                .start_pin = _start,            \
                .npins = _nr,                   \
                .reg_mask = _mask,              \
                .val = {_v1, _v2, _v3}, \
                .funcs = {_f1, _f2, "gpio"}     \
        }

#define PIN_GRP_EXTRA(_name, _start, _nr, _mask, _v1, _v2, _start2, _nr2, \
                      _f1, _f2)                         \
        {                                               \
                .name = _name,                          \
                .start_pin = _start,                    \
                .npins = _nr,                           \
                .reg_mask = _mask,                      \
                .val = {_v1, _v2},                      \
                .extra_pin = _start2,                   \
                .extra_npins = _nr2,                    \
                .funcs = {_f1, _f2}                     \
        }

static struct armada_37xx_pin_group armada_37xx_nb_groups[] = {
        PIN_GRP_GPIO("jtag", 20, 5, BIT(0), "jtag"),
        PIN_GRP_GPIO("sdio0", 8, 3, BIT(1), "sdio"),
        PIN_GRP_GPIO("emmc_nb", 27, 9, BIT(2), "emmc"),
        PIN_GRP_GPIO("pwm0", 11, 1, BIT(3), "pwm"),
        PIN_GRP_GPIO("pwm1", 12, 1, BIT(4), "pwm"),
        PIN_GRP_GPIO("pwm2", 13, 1, BIT(5), "pwm"),
        PIN_GRP_GPIO("pwm3", 14, 1, BIT(6), "pwm"),
        PIN_GRP_GPIO("pmic1", 17, 1, BIT(7), "pmic"),
        PIN_GRP_GPIO("pmic0", 16, 1, BIT(8), "pmic"),
        PIN_GRP_GPIO("i2c2", 2, 2, BIT(9), "i2c"),
        PIN_GRP_GPIO("i2c1", 0, 2, BIT(10), "i2c"),
        PIN_GRP_GPIO("spi_cs1", 17, 1, BIT(12), "spi"),
        PIN_GRP_GPIO_2("spi_cs2", 18, 1, BIT(13) | BIT(19), 0, BIT(13), "spi"),
        PIN_GRP_GPIO_2("spi_cs3", 19, 1, BIT(14) | BIT(19), 0, BIT(14), "spi"),
        PIN_GRP_GPIO("onewire", 4, 1, BIT(16), "onewire"),
        PIN_GRP_GPIO("uart1", 25, 2, BIT(17), "uart"),
        PIN_GRP_GPIO("spi_quad", 15, 2, BIT(18), "spi"),
        PIN_GRP_EXTRA("uart2", 9, 2, BIT(1) | BIT(13) | BIT(14) | BIT(19),
                      BIT(1) | BIT(13) | BIT(14), BIT(1) | BIT(19),
                      18, 2, "gpio", "uart"),
        PIN_GRP_GPIO("led0_od", 11, 1, BIT(20), "led"),
        PIN_GRP_GPIO("led1_od", 12, 1, BIT(21), "led"),
        PIN_GRP_GPIO("led2_od", 13, 1, BIT(22), "led"),
        PIN_GRP_GPIO("led3_od", 14, 1, BIT(23), "led"),

};

static struct armada_37xx_pin_group armada_37xx_sb_groups[] = {
        PIN_GRP_GPIO("usb32_drvvbus0", 0, 1, BIT(0), "drvbus"),
        PIN_GRP_GPIO("usb2_drvvbus1", 1, 1, BIT(1), "drvbus"),
        PIN_GRP_GPIO("sdio_sb", 24, 6, BIT(2), "sdio"),
        PIN_GRP_GPIO("rgmii", 6, 12, BIT(3), "mii"),
        PIN_GRP_GPIO("pcie1", 3, 2, BIT(4), "pcie"),
        PIN_GRP_GPIO("ptp", 20, 3, BIT(5), "ptp"),
        PIN_GRP("ptp_clk", 21, 1, BIT(6), "ptp", "mii"),
        PIN_GRP("ptp_trig", 22, 1, BIT(7), "ptp", "mii"),
        PIN_GRP_GPIO_3("mii_col", 23, 1, BIT(8) | BIT(14), 0, BIT(8), BIT(14),
                       "mii", "mii_err"),
};

const struct armada_37xx_pin_data armada_37xx_pin_nb = {
        .nr_pins = 36,
        .name = "GPIO1",
        .groups = armada_37xx_nb_groups,
        .ngroups = ARRAY_SIZE(armada_37xx_nb_groups),
};

const struct armada_37xx_pin_data armada_37xx_pin_sb = {
        .nr_pins = 30,
        .name = "GPIO2",
        .groups = armada_37xx_sb_groups,
        .ngroups = ARRAY_SIZE(armada_37xx_sb_groups),
};

static inline void armada_37xx_update_reg(unsigned int *reg,
                                          unsigned int offset)
{
        /* We never have more than 2 registers */
        if (offset >= GPIO_PER_REG) {
                offset -= GPIO_PER_REG;
                *reg += sizeof(u32);
        }
}

static int armada_37xx_get_func_reg(struct armada_37xx_pin_group *grp,
                                    const char *func)
{
        int f;

        for (f = 0; (f < NB_FUNCS) && grp->funcs[f]; f++)
                if (!strcmp(grp->funcs[f], func))
                        return f;

        return -ENOTSUPP;
}

static struct armada_37xx_pin_group *armada_37xx_find_next_grp_by_pin(
        struct armada_37xx_pinctrl *info, int pin, int *grp)
{
        while (*grp < info->ngroups) {
                struct armada_37xx_pin_group *group = &info->groups[*grp];
                int j;

                *grp = *grp + 1;
                for (j = 0; j < (group->npins + group->extra_npins); j++)
                        if (group->pins[j] == pin)
                                return group;
        }
        return NULL;
}

static int armada_37xx_pin_config_group_get(struct pinctrl_dev *pctldev,
                            unsigned int selector, unsigned long *config)
{
        return -ENOTSUPP;
}

static int armada_37xx_pin_config_group_set(struct pinctrl_dev *pctldev,
                            unsigned int selector, unsigned long *configs,
                            unsigned int num_configs)
{
        return -ENOTSUPP;
}

static struct pinconf_ops armada_37xx_pinconf_ops = {
        .is_generic = true,
        .pin_config_group_get = armada_37xx_pin_config_group_get,
        .pin_config_group_set = armada_37xx_pin_config_group_set,
};

static int armada_37xx_get_groups_count(struct pinctrl_dev *pctldev)
{
        struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);

        return info->ngroups;
}

static const char *armada_37xx_get_group_name(struct pinctrl_dev *pctldev,
                                              unsigned int group)
{
        struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);

        return info->groups[group].name;
}

static int armada_37xx_get_group_pins(struct pinctrl_dev *pctldev,
                                      unsigned int selector,
                                      const unsigned int **pins,
                                      unsigned int *npins)
{
        struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);

        if (selector >= info->ngroups)
                return -EINVAL;

        *pins = info->groups[selector].pins;
        *npins = info->groups[selector].npins +
                info->groups[selector].extra_npins;

        return 0;
}

static const struct pinctrl_ops armada_37xx_pctrl_ops = {
        .get_groups_count       = armada_37xx_get_groups_count,
        .get_group_name         = armada_37xx_get_group_name,
        .get_group_pins         = armada_37xx_get_group_pins,
        .dt_node_to_map         = pinconf_generic_dt_node_to_map_group,
        .dt_free_map            = pinctrl_utils_free_map,
};

/*
 * Pinmux_ops handling
 */

static int armada_37xx_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
{
        struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);

        return info->nfuncs;
}

static const char *armada_37xx_pmx_get_func_name(struct pinctrl_dev *pctldev,
                                                 unsigned int selector)
{
        struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);

        return info->funcs[selector].name;
}

static int armada_37xx_pmx_get_groups(struct pinctrl_dev *pctldev,
                                      unsigned int selector,
                                      const char * const **groups,
                                      unsigned int * const num_groups)
{
        struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);

        *groups = info->funcs[selector].groups;
        *num_groups = info->funcs[selector].ngroups;

        return 0;
}

static int armada_37xx_pmx_set_by_name(struct pinctrl_dev *pctldev,
                                       const char *name,
                                       struct armada_37xx_pin_group *grp)
{
        struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
        unsigned int reg = SELECTION;
        unsigned int mask = grp->reg_mask;
        int func, val;

        dev_dbg(info->dev, "enable function %s group %s\n",
                name, grp->name);

        func = armada_37xx_get_func_reg(grp, name);

        if (func < 0)
                return func;

        val = grp->val[func];

        regmap_update_bits(info->regmap, reg, mask, val);

        return 0;
}

static int armada_37xx_pmx_set(struct pinctrl_dev *pctldev,
                               unsigned int selector,
                               unsigned int group)
{

        struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
        struct armada_37xx_pin_group *grp = &info->groups[group];
        const char *name = info->funcs[selector].name;

        return armada_37xx_pmx_set_by_name(pctldev, name, grp);
}

static inline void armada_37xx_irq_update_reg(unsigned int *reg,
                                          struct irq_data *d)
{
        int offset = irqd_to_hwirq(d);

        armada_37xx_update_reg(reg, offset);
}

static int armada_37xx_gpio_direction_input(struct gpio_chip *chip,
                                            unsigned int offset)
{
        struct armada_37xx_pinctrl *info = gpiochip_get_data(chip);
        unsigned int reg = OUTPUT_EN;
        unsigned int mask;

        armada_37xx_update_reg(&reg, offset);
        mask = BIT(offset);

        return regmap_update_bits(info->regmap, reg, mask, 0);
}

static int armada_37xx_gpio_get_direction(struct gpio_chip *chip,
                                          unsigned int offset)
{
        struct armada_37xx_pinctrl *info = gpiochip_get_data(chip);
        unsigned int reg = OUTPUT_EN;
        unsigned int val, mask;

        armada_37xx_update_reg(&reg, offset);
        mask = BIT(offset);
        regmap_read(info->regmap, reg, &val);

        return !(val & mask);
}

static int armada_37xx_gpio_direction_output(struct gpio_chip *chip,
                                             unsigned int offset, int value)
{
        struct armada_37xx_pinctrl *info = gpiochip_get_data(chip);
        unsigned int reg = OUTPUT_EN;
        unsigned int mask;

        armada_37xx_update_reg(&reg, offset);
        mask = BIT(offset);

        return regmap_update_bits(info->regmap, reg, mask, mask);
}

static int armada_37xx_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
        struct armada_37xx_pinctrl *info = gpiochip_get_data(chip);
        unsigned int reg = INPUT_VAL;
        unsigned int val, mask;

        armada_37xx_update_reg(&reg, offset);
        mask = BIT(offset);

        regmap_read(info->regmap, reg, &val);

        return (val & mask) != 0;
}

static void armada_37xx_gpio_set(struct gpio_chip *chip, unsigned int offset,
                                 int value)
{
        struct armada_37xx_pinctrl *info = gpiochip_get_data(chip);
        unsigned int reg = OUTPUT_VAL;
        unsigned int mask, val;

        armada_37xx_update_reg(&reg, offset);
        mask = BIT(offset);
        val = value ? mask : 0;

        regmap_update_bits(info->regmap, reg, mask, val);
}

static int armada_37xx_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
                                              struct pinctrl_gpio_range *range,
                                              unsigned int offset, bool input)
{
        struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
        struct gpio_chip *chip = range->gc;

        dev_dbg(info->dev, "gpio_direction for pin %u as %s-%d to %s\n",
                offset, range->name, offset, input ? "input" : "output");

        if (input)
                armada_37xx_gpio_direction_input(chip, offset);
        else
                armada_37xx_gpio_direction_output(chip, offset, 0);

        return 0;
}

static int armada_37xx_gpio_request_enable(struct pinctrl_dev *pctldev,
                                           struct pinctrl_gpio_range *range,
                                           unsigned int offset)
{
        struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
        struct armada_37xx_pin_group *group;
        int grp = 0;

        dev_dbg(info->dev, "requesting gpio %d\n", offset);

        while ((group = armada_37xx_find_next_grp_by_pin(info, offset, &grp)))
                armada_37xx_pmx_set_by_name(pctldev, "gpio", group);

        return 0;
}

static const struct pinmux_ops armada_37xx_pmx_ops = {
        .get_functions_count    = armada_37xx_pmx_get_funcs_count,
        .get_function_name      = armada_37xx_pmx_get_func_name,
        .get_function_groups    = armada_37xx_pmx_get_groups,
        .set_mux                = armada_37xx_pmx_set,
        .gpio_request_enable    = armada_37xx_gpio_request_enable,
        .gpio_set_direction     = armada_37xx_pmx_gpio_set_direction,
};

static const struct gpio_chip armada_37xx_gpiolib_chip = {
        .request = gpiochip_generic_request,
        .free = gpiochip_generic_free,
        .set = armada_37xx_gpio_set,
        .get = armada_37xx_gpio_get,
        .get_direction  = armada_37xx_gpio_get_direction,
        .direction_input = armada_37xx_gpio_direction_input,
        .direction_output = armada_37xx_gpio_direction_output,
        .owner = THIS_MODULE,
};

static void armada_37xx_irq_ack(struct irq_data *d)
{
        struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
        struct armada_37xx_pinctrl *info = gpiochip_get_data(chip);
        u32 reg = IRQ_STATUS;
        unsigned long flags;

        armada_37xx_irq_update_reg(&reg, d);
        spin_lock_irqsave(&info->irq_lock, flags);
        writel(d->mask, info->base + reg);
        spin_unlock_irqrestore(&info->irq_lock, flags);
}

static void armada_37xx_irq_mask(struct irq_data *d)
{
        struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
        struct armada_37xx_pinctrl *info = gpiochip_get_data(chip);
        u32 val, reg = IRQ_EN;
        unsigned long flags;

        armada_37xx_irq_update_reg(&reg, d);
        spin_lock_irqsave(&info->irq_lock, flags);
        val = readl(info->base + reg);
        writel(val & ~d->mask, info->base + reg);
        spin_unlock_irqrestore(&info->irq_lock, flags);
}

static void armada_37xx_irq_unmask(struct irq_data *d)
{
        struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
        struct armada_37xx_pinctrl *info = gpiochip_get_data(chip);
        u32 val, reg = IRQ_EN;
        unsigned long flags;

        armada_37xx_irq_update_reg(&reg, d);
        spin_lock_irqsave(&info->irq_lock, flags);
        val = readl(info->base + reg);
        writel(val | d->mask, info->base + reg);
        spin_unlock_irqrestore(&info->irq_lock, flags);
}

static int armada_37xx_irq_set_wake(struct irq_data *d, unsigned int on)
{
        struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
        struct armada_37xx_pinctrl *info = gpiochip_get_data(chip);
        u32 val, reg = IRQ_WKUP;
        unsigned long flags;

        armada_37xx_irq_update_reg(&reg, d);
        spin_lock_irqsave(&info->irq_lock, flags);
        val = readl(info->base + reg);
        if (on)
                val |= d->mask;
        else
                val &= ~d->mask;
        writel(val, info->base + reg);
        spin_unlock_irqrestore(&info->irq_lock, flags);

        return 0;
}

static int armada_37xx_irq_set_type(struct irq_data *d, unsigned int type)
{
        struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
        struct armada_37xx_pinctrl *info = gpiochip_get_data(chip);
        u32 val, reg = IRQ_POL;
        unsigned long flags;

        spin_lock_irqsave(&info->irq_lock, flags);
        armada_37xx_irq_update_reg(&reg, d);
        val = readl(info->base + reg);
        switch (type) {
        case IRQ_TYPE_EDGE_RISING:
                val &= ~d->mask;
                break;
        case IRQ_TYPE_EDGE_FALLING:
                val |= d->mask;
                break;
        default:
                spin_unlock_irqrestore(&info->irq_lock, flags);
                return -EINVAL;
        }
        writel(val, info->base + reg);
        spin_unlock_irqrestore(&info->irq_lock, flags);

        return 0;
}


static void armada_37xx_irq_handler(struct irq_desc *desc)
{
        struct gpio_chip *gc = irq_desc_get_handler_data(desc);
        struct irq_chip *chip = irq_desc_get_chip(desc);
        struct armada_37xx_pinctrl *info = gpiochip_get_data(gc);
        struct irq_domain *d = gc->irqdomain;
        int i;

        chained_irq_enter(chip, desc);
        for (i = 0; i <= d->revmap_size / GPIO_PER_REG; i++) {
                u32 status;
                unsigned long flags;

                spin_lock_irqsave(&info->irq_lock, flags);
                status = readl_relaxed(info->base + IRQ_STATUS + 4 * i);
                /* Manage only the interrupt that was enabled */
                status &= readl_relaxed(info->base + IRQ_EN + 4 * i);
                spin_unlock_irqrestore(&info->irq_lock, flags);
                while (status) {
                        u32 hwirq = ffs(status) - 1;
                        u32 virq = irq_find_mapping(d, hwirq +
                                                     i * GPIO_PER_REG);

                        generic_handle_irq(virq);

                        /* Update status in case a new IRQ appears */
                        spin_lock_irqsave(&info->irq_lock, flags);
                        status = readl_relaxed(info->base +
                                               IRQ_STATUS + 4 * i);
                        /* Manage only the interrupt that was enabled */
                        status &= readl_relaxed(info->base + IRQ_EN + 4 * i);
                        spin_unlock_irqrestore(&info->irq_lock, flags);
                }
        }
        chained_irq_exit(chip, desc);
}

static int armada_37xx_irqchip_register(struct platform_device *pdev,
                                        struct armada_37xx_pinctrl *info)
{
        struct device_node *np = info->dev->of_node;
        int nrirqs = info->data->nr_pins;
        struct gpio_chip *gc = &info->gpio_chip;
        struct irq_chip *irqchip = &info->irq_chip;
        struct resource res;
        int ret = -ENODEV, i, nr_irq_parent;

        /* Check if we have at least one gpio-controller child node */
        for_each_child_of_node(info->dev->of_node, np) {
                if (of_property_read_bool(np, "gpio-controller")) {
                        ret = 0;
                        break;
                }
        };
        if (ret)
                return ret;

        nr_irq_parent = of_irq_count(np);
        spin_lock_init(&info->irq_lock);

        if (!nr_irq_parent) {
                dev_err(&pdev->dev, "Invalid or no IRQ\n");
                return 0;
        }

        if (of_address_to_resource(info->dev->of_node, 1, &res)) {
                dev_err(info->dev, "cannot find IO resource\n");
                return -ENOENT;
        }

        info->base = devm_ioremap_resource(info->dev, &res);
        if (IS_ERR(info->base))
                return PTR_ERR(info->base);

        irqchip->irq_ack = armada_37xx_irq_ack;
        irqchip->irq_mask = armada_37xx_irq_mask;
        irqchip->irq_unmask = armada_37xx_irq_unmask;
        irqchip->irq_set_wake = armada_37xx_irq_set_wake;
        irqchip->irq_set_type = armada_37xx_irq_set_type;
        irqchip->name = info->data->name;

        ret = gpiochip_irqchip_add(gc, irqchip, 0,
                                   handle_edge_irq, IRQ_TYPE_NONE);
        if (ret) {
                dev_info(&pdev->dev, "could not add irqchip\n");
                return ret;
        }

        /*
         * Many interrupts are connected to the parent interrupt
         * controller. But we do not take advantage of this and use
         * the chained irq with all of them.
         */
        for (i = 0; i < nrirqs; i++) {
                struct irq_data *d = irq_get_irq_data(gc->irq_base + i);

                /*
                 * The mask field is a "precomputed bitmask for
                 * accessing the chip registers" which was introduced
                 * for the generic irqchip framework. As we don't use
                 * this framework, we can reuse this field for our own
                 * usage.
                 */
                d->mask = BIT(i % GPIO_PER_REG);
        }

        for (i = 0; i < nr_irq_parent; i++) {
                int irq = irq_of_parse_and_map(np, i);

                if (irq < 0)
                        continue;

                gpiochip_set_chained_irqchip(gc, irqchip, irq,
                                             armada_37xx_irq_handler);
        }

        return 0;
}

static int armada_37xx_gpiochip_register(struct platform_device *pdev,
                                        struct armada_37xx_pinctrl *info)
{
        struct device_node *np;
        struct gpio_chip *gc;
        int ret = -ENODEV;

        for_each_child_of_node(info->dev->of_node, np) {
                if (of_find_property(np, "gpio-controller", NULL)) {
                        ret = 0;
                        break;
                }
        };
        if (ret)
                return ret;

        info->gpio_chip = armada_37xx_gpiolib_chip;

        gc = &info->gpio_chip;
        gc->ngpio = info->data->nr_pins;
        gc->parent = &pdev->dev;
        gc->base = -1;
        gc->of_node = np;
        gc->label = info->data->name;

        ret = devm_gpiochip_add_data(&pdev->dev, gc, info);
        if (ret)
                return ret;
        ret = armada_37xx_irqchip_register(pdev, info);
        if (ret)
                return ret;

        return 0;
}

/**
 * armada_37xx_add_function() - Add a new function to the list
 * @funcs: array of function to add the new one
 * @funcsize: size of the remaining space for the function
 * @name: name of the function to add
 *
 * If it is a new function then create it by adding its name else
 * increment the number of group associated to this function.
 */
static int armada_37xx_add_function(struct armada_37xx_pmx_func *funcs,
                                    int *funcsize, const char *name)
{
        int i = 0;

        if (*funcsize <= 0)
                return -EOVERFLOW;

        while (funcs->ngroups) {
                /* function already there */
                if (strcmp(funcs->name, name) == 0) {
                        funcs->ngroups++;

                        return -EEXIST;
                }
                funcs++;
                i++;
        }

        /* append new unique function */
        funcs->name = name;
        funcs->ngroups = 1;
        (*funcsize)--;

        return 0;
}

/**
 * armada_37xx_fill_group() - complete the group array
 * @info: info driver instance
 *
 * Based on the data available from the armada_37xx_pin_group array
 * completes the last member of the struct for each function: the list
 * of the groups associated to this function.
 *
 */
static int armada_37xx_fill_group(struct armada_37xx_pinctrl *info)
{
        int n, num = 0, funcsize = info->data->nr_pins;

        for (n = 0; n < info->ngroups; n++) {
                struct armada_37xx_pin_group *grp = &info->groups[n];
                int i, j, f;

                grp->pins = devm_kzalloc(info->dev,
                                         (grp->npins + grp->extra_npins) *
                                         sizeof(*grp->pins), GFP_KERNEL);
                if (!grp->pins)
                        return -ENOMEM;

                for (i = 0; i < grp->npins; i++)
                        grp->pins[i] = grp->start_pin + i;

                for (j = 0; j < grp->extra_npins; j++)
                        grp->pins[i+j] = grp->extra_pin + j;

                for (f = 0; (f < NB_FUNCS) && grp->funcs[f]; f++) {
                        int ret;
                        /* check for unique functions and count groups */
                        ret = armada_37xx_add_function(info->funcs, &funcsize,
                                            grp->funcs[f]);
                        if (ret == -EOVERFLOW)
                                dev_err(info->dev,
                                        "More functions than pins(%d)\n",
                                        info->data->nr_pins);
                        if (ret < 0)
                                continue;
                        num++;
                }
        }

        info->nfuncs = num;

        return 0;
}

/**
 * armada_37xx_fill_funcs() - complete the funcs array
 * @info: info driver instance
 *
 * Based on the data available from the armada_37xx_pin_group array
 * completes the last two member of the struct for each group:
 * - the list of the pins included in the group
 * - the list of pinmux functions that can be selected for this group
 *
 */
static int armada_37xx_fill_func(struct armada_37xx_pinctrl *info)
{
        struct armada_37xx_pmx_func *funcs = info->funcs;
        int n;

        for (n = 0; n < info->nfuncs; n++) {
                const char *name = funcs[n].name;
                const char **groups;
                int g;

                funcs[n].groups = devm_kzalloc(info->dev, funcs[n].ngroups *
                                               sizeof(*(funcs[n].groups)),
                                               GFP_KERNEL);
                if (!funcs[n].groups)
                        return -ENOMEM;

                groups = funcs[n].groups;

                for (g = 0; g < info->ngroups; g++) {
                        struct armada_37xx_pin_group *gp = &info->groups[g];
                        int f;

                        for (f = 0; (f < NB_FUNCS) && gp->funcs[f]; f++) {
                                if (strcmp(gp->funcs[f], name) == 0) {
                                        *groups = gp->name;
                                        groups++;
                                }
                        }
                }
        }
        return 0;
}

static int armada_37xx_pinctrl_register(struct platform_device *pdev,
                                        struct armada_37xx_pinctrl *info)
{
        const struct armada_37xx_pin_data *pin_data = info->data;
        struct pinctrl_desc *ctrldesc = &info->pctl;
        struct pinctrl_pin_desc *pindesc, *pdesc;
        int pin, ret;

        info->groups = pin_data->groups;
        info->ngroups = pin_data->ngroups;

        ctrldesc->name = "armada_37xx-pinctrl";
        ctrldesc->owner = THIS_MODULE;
        ctrldesc->pctlops = &armada_37xx_pctrl_ops;
        ctrldesc->pmxops = &armada_37xx_pmx_ops;
        ctrldesc->confops = &armada_37xx_pinconf_ops;

        pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) *
                               pin_data->nr_pins, GFP_KERNEL);
        if (!pindesc)
                return -ENOMEM;

        ctrldesc->pins = pindesc;
        ctrldesc->npins = pin_data->nr_pins;

        pdesc = pindesc;
        for (pin = 0; pin < pin_data->nr_pins; pin++) {
                pdesc->number = pin;
                pdesc->name = kasprintf(GFP_KERNEL, "%s-%d",
                                        pin_data->name, pin);
                pdesc++;
        }

        /*
         * we allocate functions for number of pins and hope there are
         * fewer unique functions than pins available
         */
        info->funcs = devm_kzalloc(&pdev->dev, pin_data->nr_pins *
                           sizeof(struct armada_37xx_pmx_func), GFP_KERNEL);
        if (!info->funcs)
                return -ENOMEM;


        ret = armada_37xx_fill_group(info);
        if (ret)
                return ret;

        ret = armada_37xx_fill_func(info);
        if (ret)
                return ret;

        info->pctl_dev = devm_pinctrl_register(&pdev->dev, ctrldesc, info);
        if (IS_ERR(info->pctl_dev)) {
                dev_err(&pdev->dev, "could not register pinctrl driver\n");
                return PTR_ERR(info->pctl_dev);
        }

        return 0;
}

static const struct of_device_id armada_37xx_pinctrl_of_match[] = {
        {
                .compatible = "marvell,armada3710-sb-pinctrl",
                .data = (void *)&armada_37xx_pin_sb,
        },
        {
                .compatible = "marvell,armada3710-nb-pinctrl",
                .data = (void *)&armada_37xx_pin_nb,
        },
        { },
};

static int __init armada_37xx_pinctrl_probe(struct platform_device *pdev)
{
        struct armada_37xx_pinctrl *info;
        struct device *dev = &pdev->dev;
        struct device_node *np = dev->of_node;
        struct regmap *regmap;
        int ret;

        info = devm_kzalloc(dev, sizeof(struct armada_37xx_pinctrl),
                            GFP_KERNEL);
        if (!info)
                return -ENOMEM;

        info->dev = dev;

        regmap = syscon_node_to_regmap(np);
        if (IS_ERR(regmap)) {
                dev_err(&pdev->dev, "cannot get regmap\n");
                return PTR_ERR(regmap);
        }
        info->regmap = regmap;

        info->data = of_device_get_match_data(dev);

        ret = armada_37xx_pinctrl_register(pdev, info);
        if (ret)
                return ret;

        ret = armada_37xx_gpiochip_register(pdev, info);
        if (ret)
                return ret;

        platform_set_drvdata(pdev, info);

        return 0;
}

static struct platform_driver armada_37xx_pinctrl_driver = {
        .driver = {
                .name = "armada-37xx-pinctrl",
                .of_match_table = armada_37xx_pinctrl_of_match,
        },
};

builtin_platform_driver_probe(armada_37xx_pinctrl_driver,
                              armada_37xx_pinctrl_probe);