// SPDX-License-Identifier: GPL-2.0-only
/*
 * Pinctrl for Cirrus Logic Madera codecs
 *
 * Copyright (C) 2016-2018 Cirrus Logic
 */

#include <linux/err.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/seq_file.h>
#include <linux/slab.h>

#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>

#include <linux/mfd/madera/core.h>
#include <linux/mfd/madera/registers.h>

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

#include "pinctrl-madera.h"

/*
 * Use pin GPIO names for consistency
 * NOTE: IDs are zero-indexed for coding convenience
 */
static const struct pinctrl_pin_desc madera_pins[] = {
        PINCTRL_PIN(0, "gpio1"),
        PINCTRL_PIN(1, "gpio2"),
        PINCTRL_PIN(2, "gpio3"),
        PINCTRL_PIN(3, "gpio4"),
        PINCTRL_PIN(4, "gpio5"),
        PINCTRL_PIN(5, "gpio6"),
        PINCTRL_PIN(6, "gpio7"),
        PINCTRL_PIN(7, "gpio8"),
        PINCTRL_PIN(8, "gpio9"),
        PINCTRL_PIN(9, "gpio10"),
        PINCTRL_PIN(10, "gpio11"),
        PINCTRL_PIN(11, "gpio12"),
        PINCTRL_PIN(12, "gpio13"),
        PINCTRL_PIN(13, "gpio14"),
        PINCTRL_PIN(14, "gpio15"),
        PINCTRL_PIN(15, "gpio16"),
        PINCTRL_PIN(16, "gpio17"),
        PINCTRL_PIN(17, "gpio18"),
        PINCTRL_PIN(18, "gpio19"),
        PINCTRL_PIN(19, "gpio20"),
        PINCTRL_PIN(20, "gpio21"),
        PINCTRL_PIN(21, "gpio22"),
        PINCTRL_PIN(22, "gpio23"),
        PINCTRL_PIN(23, "gpio24"),
        PINCTRL_PIN(24, "gpio25"),
        PINCTRL_PIN(25, "gpio26"),
        PINCTRL_PIN(26, "gpio27"),
        PINCTRL_PIN(27, "gpio28"),
        PINCTRL_PIN(28, "gpio29"),
        PINCTRL_PIN(29, "gpio30"),
        PINCTRL_PIN(30, "gpio31"),
        PINCTRL_PIN(31, "gpio32"),
        PINCTRL_PIN(32, "gpio33"),
        PINCTRL_PIN(33, "gpio34"),
        PINCTRL_PIN(34, "gpio35"),
        PINCTRL_PIN(35, "gpio36"),
        PINCTRL_PIN(36, "gpio37"),
        PINCTRL_PIN(37, "gpio38"),
        PINCTRL_PIN(38, "gpio39"),
        PINCTRL_PIN(39, "gpio40"),
};

/*
 * All single-pin functions can be mapped to any GPIO, however pinmux applies
 * functions to pin groups and only those groups declared as supporting that
 * function. To make this work we must put each pin in its own dummy group so
 * that the functions can be described as applying to all pins.
 * Since these do not correspond to anything in the actual hardware - they are
 * merely an adaptation to pinctrl's view of the world - we use the same name
 * as the pin to avoid confusion when comparing with datasheet instructions
 */
static const char * const madera_pin_single_group_names[] = {
        "gpio1",  "gpio2",  "gpio3",  "gpio4",  "gpio5",  "gpio6",  "gpio7",
        "gpio8",  "gpio9",  "gpio10", "gpio11", "gpio12", "gpio13", "gpio14",
        "gpio15", "gpio16", "gpio17", "gpio18", "gpio19", "gpio20", "gpio21",
        "gpio22", "gpio23", "gpio24", "gpio25", "gpio26", "gpio27", "gpio28",
        "gpio29", "gpio30", "gpio31", "gpio32", "gpio33", "gpio34", "gpio35",
        "gpio36", "gpio37", "gpio38", "gpio39", "gpio40",
};

/* set of pin numbers for single-pin groups, zero-indexed */
static const unsigned int madera_pin_single_group_pins[] = {
          0,  1,  2,  3,  4,  5,  6,
          7,  8,  9, 10, 11, 12, 13,
         14, 15, 16, 17, 18, 19, 20,
         21, 22, 23, 24, 25, 26, 27,
         28, 29, 30, 31, 32, 33, 34,
         35, 36, 37, 38, 39,
};

static const char * const madera_aif1_group_names[] = { "aif1" };
static const char * const madera_aif2_group_names[] = { "aif2" };
static const char * const madera_aif3_group_names[] = { "aif3" };
static const char * const madera_aif4_group_names[] = { "aif4" };
static const char * const madera_mif1_group_names[] = { "mif1" };
static const char * const madera_mif2_group_names[] = { "mif2" };
static const char * const madera_mif3_group_names[] = { "mif3" };
static const char * const madera_dmic3_group_names[] = { "dmic3" };
static const char * const madera_dmic4_group_names[] = { "dmic4" };
static const char * const madera_dmic5_group_names[] = { "dmic5" };
static const char * const madera_dmic6_group_names[] = { "dmic6" };
static const char * const madera_spk1_group_names[] = { "pdmspk1" };
static const char * const madera_spk2_group_names[] = { "pdmspk2" };

/*
 * alt-functions always apply to a single pin group, other functions always
 * apply to all pins
 */
static const struct {
        const char *name;
        const char * const *group_names;
        u32 func;
} madera_mux_funcs[] = {
        {
                .name = "aif1",
                .group_names = madera_aif1_group_names,
                .func = 0x000
        },
        {
                .name = "aif2",
                .group_names = madera_aif2_group_names,
                .func = 0x000
        },
        {
                .name = "aif3",
                .group_names = madera_aif3_group_names,
                .func = 0x000
        },
        {
                .name = "aif4",
                .group_names = madera_aif4_group_names,
                .func = 0x000
        },
        {
                .name = "mif1",
                .group_names = madera_mif1_group_names,
                .func = 0x000
        },
        {
                .name = "mif2",
                .group_names = madera_mif2_group_names,
                .func = 0x000
        },
        {
                .name = "mif3",
                .group_names = madera_mif3_group_names,
                .func = 0x000
        },
        {
                .name = "dmic3",
                .group_names = madera_dmic3_group_names,
                .func = 0x000
        },
        {
                .name = "dmic4",
                .group_names = madera_dmic4_group_names,
                .func = 0x000
        },
        {
                .name = "dmic5",
                .group_names = madera_dmic5_group_names,
                .func = 0x000
        },
        {
                .name = "dmic6",
                .group_names = madera_dmic6_group_names,
                .func = 0x000
        },
        {
                .name = "pdmspk1",
                .group_names = madera_spk1_group_names,
                .func = 0x000
        },
        {
                .name = "pdmspk2",
                .group_names = madera_spk2_group_names,
                .func = 0x000
        },
        {
                .name = "io",
                .group_names = madera_pin_single_group_names,
                .func = 0x001
        },
        {
                .name = "dsp-gpio",
                .group_names = madera_pin_single_group_names,
                .func = 0x002
        },
        {
                .name = "irq1",
                .group_names = madera_pin_single_group_names,
                .func = 0x003
        },
        {
                .name = "irq2",
                .group_names = madera_pin_single_group_names,
                .func = 0x004
        },
        {
                .name = "fll1-clk",
                .group_names = madera_pin_single_group_names,
                .func = 0x010
        },
        {
                .name = "fll2-clk",
                .group_names = madera_pin_single_group_names,
                .func = 0x011
        },
        {
                .name = "fll3-clk",
                .group_names = madera_pin_single_group_names,
                .func = 0x012
        },
        {
                .name = "fllao-clk",
                .group_names = madera_pin_single_group_names,
                .func = 0x013
        },
        {
                .name = "fll1-lock",
                .group_names = madera_pin_single_group_names,
                .func = 0x018
        },
        {
                .name = "fll2-lock",
                .group_names = madera_pin_single_group_names,
                .func = 0x019
        },
        {
                .name = "fll3-lock",
                .group_names = madera_pin_single_group_names,
                .func = 0x01a
        },
        {
                .name = "fllao-lock",
                .group_names = madera_pin_single_group_names,
                .func = 0x01b
        },
        {
                .name = "opclk",
                .group_names = madera_pin_single_group_names,
                .func = 0x040
        },
        {
                .name = "opclk-async",
                .group_names = madera_pin_single_group_names,
                .func = 0x041
        },
        {
                .name = "pwm1",
                .group_names = madera_pin_single_group_names,
                .func = 0x048
        },
        {
                .name = "pwm2",
                .group_names = madera_pin_single_group_names,
                .func = 0x049
        },
        {
                .name = "spdif",
                .group_names = madera_pin_single_group_names,
                .func = 0x04c
        },
        {
                .name = "asrc1-in1-lock",
                .group_names = madera_pin_single_group_names,
                .func = 0x088
        },
        {
                .name = "asrc1-in2-lock",
                .group_names = madera_pin_single_group_names,
                .func = 0x089
        },
        {
                .name = "asrc2-in1-lock",
                .group_names = madera_pin_single_group_names,
                .func = 0x08a
        },
        {
                .name = "asrc2-in2-lock",
                .group_names = madera_pin_single_group_names,
                .func = 0x08b
        },
        {
                .name = "spkl-short-circuit",
                .group_names = madera_pin_single_group_names,
                .func = 0x0b6
        },
        {
                .name = "spkr-short-circuit",
                .group_names = madera_pin_single_group_names,
                .func = 0x0b7
        },
        {
                .name = "spk-shutdown",
                .group_names = madera_pin_single_group_names,
                .func = 0x0e0
        },
        {
                .name = "spk-overheat-shutdown",
                .group_names = madera_pin_single_group_names,
                .func = 0x0e1
        },
        {
                .name = "spk-overheat-warn",
                .group_names = madera_pin_single_group_names,
                .func = 0x0e2
        },
        {
                .name = "timer1-sts",
                .group_names = madera_pin_single_group_names,
                .func = 0x140
        },
        {
                .name = "timer2-sts",
                .group_names = madera_pin_single_group_names,
                .func = 0x141
        },
        {
                .name = "timer3-sts",
                .group_names = madera_pin_single_group_names,
                .func = 0x142
        },
        {
                .name = "timer4-sts",
                .group_names = madera_pin_single_group_names,
                .func = 0x143
        },
        {
                .name = "timer5-sts",
                .group_names = madera_pin_single_group_names,
                .func = 0x144
        },
        {
                .name = "timer6-sts",
                .group_names = madera_pin_single_group_names,
                .func = 0x145
        },
        {
                .name = "timer7-sts",
                .group_names = madera_pin_single_group_names,
                .func = 0x146
        },
        {
                .name = "timer8-sts",
                .group_names = madera_pin_single_group_names,
                .func = 0x147
        },
        {
                .name = "log1-fifo-ne",
                .group_names = madera_pin_single_group_names,
                .func = 0x150
        },
        {
                .name = "log2-fifo-ne",
                .group_names = madera_pin_single_group_names,
                .func = 0x151
        },
        {
                .name = "log3-fifo-ne",
                .group_names = madera_pin_single_group_names,
                .func = 0x152
        },
        {
                .name = "log4-fifo-ne",
                .group_names = madera_pin_single_group_names,
                .func = 0x153
        },
        {
                .name = "log5-fifo-ne",
                .group_names = madera_pin_single_group_names,
                .func = 0x154
        },
        {
                .name = "log6-fifo-ne",
                .group_names = madera_pin_single_group_names,
                .func = 0x155
        },
        {
                .name = "log7-fifo-ne",
                .group_names = madera_pin_single_group_names,
                .func = 0x156
        },
        {
                .name = "log8-fifo-ne",
                .group_names = madera_pin_single_group_names,
                .func = 0x157
        },
        {
                .name = "aux-pdm-clk",
                .group_names = madera_pin_single_group_names,
                .func = 0x280
        },
        {
                .name = "aux-pdm-dat",
                .group_names = madera_pin_single_group_names,
                .func = 0x281
        },
};

static u16 madera_pin_make_drv_str(struct madera_pin_private *priv,
                                      unsigned int milliamps)
{
        switch (milliamps) {
        case 4:
                return 0;
        case 8:
                return 2 << MADERA_GP1_DRV_STR_SHIFT;
        default:
                break;
        }

        dev_warn(priv->dev, "%u mA not a valid drive strength", milliamps);

        return 0;
}

static unsigned int madera_pin_unmake_drv_str(struct madera_pin_private *priv,
                                              u16 regval)
{
        regval = (regval & MADERA_GP1_DRV_STR_MASK) >> MADERA_GP1_DRV_STR_SHIFT;

        switch (regval) {
        case 0:
                return 4;
        case 2:
                return 8;
        default:
                return 0;
        }
}

static int madera_get_groups_count(struct pinctrl_dev *pctldev)
{
        struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);

        /* Number of alt function groups plus number of single-pin groups */
        return priv->chip->n_pin_groups + priv->chip->n_pins;
}

static const char *madera_get_group_name(struct pinctrl_dev *pctldev,
                                         unsigned int selector)
{
        struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);

        if (selector < priv->chip->n_pin_groups)
                return priv->chip->pin_groups[selector].name;

        selector -= priv->chip->n_pin_groups;
        return madera_pin_single_group_names[selector];
}

static int madera_get_group_pins(struct pinctrl_dev *pctldev,
                                 unsigned int selector,
                                 const unsigned int **pins,
                                 unsigned int *num_pins)
{
        struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);

        if (selector < priv->chip->n_pin_groups) {
                *pins = priv->chip->pin_groups[selector].pins;
                *num_pins = priv->chip->pin_groups[selector].n_pins;
        } else {
                /* return the dummy group for a single pin */
                selector -= priv->chip->n_pin_groups;
                *pins = &madera_pin_single_group_pins[selector];
                *num_pins = 1;
        }
        return 0;
}

static void madera_pin_dbg_show_fn(struct madera_pin_private *priv,
                                   struct seq_file *s,
                                   unsigned int pin, unsigned int fn)
{
        const struct madera_pin_chip *chip = priv->chip;
        int i, g_pin;

        if (fn != 0) {
                for (i = 0; i < ARRAY_SIZE(madera_mux_funcs); ++i) {
                        if (madera_mux_funcs[i].func == fn) {
                                seq_printf(s, " FN=%s",
                                           madera_mux_funcs[i].name);
                                return;
                        }
                }
                return; /* ignore unknown function values */
        }

        /* alt function */
        for (i = 0; i < chip->n_pin_groups; ++i) {
                for (g_pin = 0; g_pin < chip->pin_groups[i].n_pins; ++g_pin) {
                        if (chip->pin_groups[i].pins[g_pin] == pin) {
                                seq_printf(s, " FN=%s",
                                           chip->pin_groups[i].name);
                                return;
                        }
                }
        }
}

static void __maybe_unused madera_pin_dbg_show(struct pinctrl_dev *pctldev,
                                               struct seq_file *s,
                                               unsigned int pin)
{
        struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);
        unsigned int conf[2];
        unsigned int reg = MADERA_GPIO1_CTRL_1 + (2 * pin);
        unsigned int fn;
        int ret;

        ret = regmap_read(priv->madera->regmap, reg, &conf[0]);
        if (ret)
                return;

        ret = regmap_read(priv->madera->regmap, reg + 1, &conf[1]);
        if (ret)
                return;

        seq_printf(s, "%04x:%04x", conf[0], conf[1]);

        fn = (conf[0] & MADERA_GP1_FN_MASK) >> MADERA_GP1_FN_SHIFT;
        madera_pin_dbg_show_fn(priv, s, pin, fn);

        /* State of direction bit is only relevant if function==1 */
        if (fn == 1) {
                if (conf[1] & MADERA_GP1_DIR_MASK)
                        seq_puts(s, " IN");
                else
                        seq_puts(s, " OUT");
        }

        if (conf[1] & MADERA_GP1_PU_MASK)
                seq_puts(s, " PU");

        if (conf[1] & MADERA_GP1_PD_MASK)
                seq_puts(s, " PD");

        if (conf[0] & MADERA_GP1_DB_MASK)
                seq_puts(s, " DB");

        if (conf[0] & MADERA_GP1_OP_CFG_MASK)
                seq_puts(s, " OD");
        else
                seq_puts(s, " CMOS");

        seq_printf(s, " DRV=%umA", madera_pin_unmake_drv_str(priv, conf[1]));

        if (conf[0] & MADERA_GP1_IP_CFG_MASK)
                seq_puts(s, " SCHMITT");
}

static const struct pinctrl_ops madera_pin_group_ops = {
        .get_groups_count = madera_get_groups_count,
        .get_group_name = madera_get_group_name,
        .get_group_pins = madera_get_group_pins,
#if IS_ENABLED(CONFIG_OF)
        .dt_node_to_map = pinconf_generic_dt_node_to_map_all,
        .dt_free_map = pinctrl_utils_free_map,
#endif
#if IS_ENABLED(CONFIG_DEBUG_FS)
        .pin_dbg_show = madera_pin_dbg_show,
#endif
};

static int madera_mux_get_funcs_count(struct pinctrl_dev *pctldev)
{
        return ARRAY_SIZE(madera_mux_funcs);
}

static const char *madera_mux_get_func_name(struct pinctrl_dev *pctldev,
                                            unsigned int selector)
{
        return madera_mux_funcs[selector].name;
}

static int madera_mux_get_groups(struct pinctrl_dev *pctldev,
                                 unsigned int selector,
                                 const char * const **groups,
                                 unsigned int * const num_groups)
{
        struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);

        *groups = madera_mux_funcs[selector].group_names;

        if (madera_mux_funcs[selector].func == 0) {
                /* alt func always maps to a single group */
                *num_groups = 1;
        } else {
                /* other funcs map to all available gpio pins */
                *num_groups = priv->chip->n_pins;
        }

        return 0;
}

static int madera_mux_set_mux(struct pinctrl_dev *pctldev,
                              unsigned int selector,
                              unsigned int group)
{
        struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);
        struct madera *madera = priv->madera;
        const struct madera_pin_groups *pin_group = priv->chip->pin_groups;
        unsigned int n_chip_groups = priv->chip->n_pin_groups;
        const char *func_name = madera_mux_funcs[selector].name;
        unsigned int reg;
        int i, ret = 0;

        dev_dbg(priv->dev, "%s selecting %u (%s) for group %u (%s)\n",
                __func__, selector, func_name, group,
                madera_get_group_name(pctldev, group));

        if (madera_mux_funcs[selector].func == 0) {
                /* alt func pin assignments are codec-specific */
                for (i = 0; i < n_chip_groups; ++i) {
                        if (strcmp(func_name, pin_group->name) == 0)
                                break;

                        ++pin_group;
                }

                if (i == n_chip_groups)
                        return -EINVAL;

                for (i = 0; i < pin_group->n_pins; ++i) {
                        reg = MADERA_GPIO1_CTRL_1 + (2 * pin_group->pins[i]);

                        dev_dbg(priv->dev, "%s setting 0x%x func bits to 0\n",
                                __func__, reg);

                        ret = regmap_update_bits(madera->regmap, reg,
                                                 MADERA_GP1_FN_MASK, 0);
                        if (ret)
                                break;

                }
        } else {
                /*
                 * for other funcs the group will be the gpio number and will
                 * be offset by the number of chip-specific functions at the
                 * start of the group list
                 */
                group -= n_chip_groups;
                reg = MADERA_GPIO1_CTRL_1 + (2 * group);

                dev_dbg(priv->dev, "%s setting 0x%x func bits to 0x%x\n",
                        __func__, reg, madera_mux_funcs[selector].func);

                ret = regmap_update_bits(madera->regmap,
                                         reg,
                                         MADERA_GP1_FN_MASK,
                                         madera_mux_funcs[selector].func);
        }

        if (ret)
                dev_err(priv->dev, "Failed to write to 0x%x (%d)\n", reg, ret);

        return ret;
}

static int madera_gpio_set_direction(struct pinctrl_dev *pctldev,
                                     struct pinctrl_gpio_range *range,
                                     unsigned int offset,
                                     bool input)
{
        struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);
        struct madera *madera = priv->madera;
        unsigned int reg = MADERA_GPIO1_CTRL_2 + (2 * offset);
        unsigned int val;
        int ret;

        if (input)
                val = MADERA_GP1_DIR;
        else
                val = 0;

        ret = regmap_update_bits(madera->regmap, reg, MADERA_GP1_DIR_MASK, val);
        if (ret)
                dev_err(priv->dev, "Failed to write to 0x%x (%d)\n", reg, ret);

        return ret;
}

static int madera_gpio_request_enable(struct pinctrl_dev *pctldev,
                                      struct pinctrl_gpio_range *range,
                                      unsigned int offset)
{
        struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);
        struct madera *madera = priv->madera;
        unsigned int reg = MADERA_GPIO1_CTRL_1 + (2 * offset);
        int ret;

        /* put the pin into GPIO mode */
        ret = regmap_update_bits(madera->regmap, reg, MADERA_GP1_FN_MASK, 1);
        if (ret)
                dev_err(priv->dev, "Failed to write to 0x%x (%d)\n", reg, ret);

        return ret;
}

static void madera_gpio_disable_free(struct pinctrl_dev *pctldev,
                                     struct pinctrl_gpio_range *range,
                                     unsigned int offset)
{
        struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);
        struct madera *madera = priv->madera;
        unsigned int reg = MADERA_GPIO1_CTRL_1 + (2 * offset);
        int ret;

        /* disable GPIO by setting to GPIO IN */
        madera_gpio_set_direction(pctldev, range, offset, true);

        ret = regmap_update_bits(madera->regmap, reg, MADERA_GP1_FN_MASK, 1);
        if (ret)
                dev_err(priv->dev, "Failed to write to 0x%x (%d)\n", reg, ret);
}

static const struct pinmux_ops madera_pin_mux_ops = {
        .get_functions_count = madera_mux_get_funcs_count,
        .get_function_name = madera_mux_get_func_name,
        .get_function_groups = madera_mux_get_groups,
        .set_mux = madera_mux_set_mux,
        .gpio_request_enable = madera_gpio_request_enable,
        .gpio_disable_free = madera_gpio_disable_free,
        .gpio_set_direction = madera_gpio_set_direction,
        .strict = true, /* GPIO and other functions are exclusive */
};

static int madera_pin_conf_get(struct pinctrl_dev *pctldev, unsigned int pin,
                               unsigned long *config)
{
        struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);
        unsigned int param = pinconf_to_config_param(*config);
        unsigned int result = 0;
        unsigned int reg = MADERA_GPIO1_CTRL_1 + (2 * pin);
        unsigned int conf[2];
        int ret;

        ret = regmap_read(priv->madera->regmap, reg, &conf[0]);
        if (!ret)
                ret = regmap_read(priv->madera->regmap, reg + 1, &conf[1]);

        if (ret) {
                dev_err(priv->dev, "Failed to read GP%d conf (%d)\n",
                        pin + 1, ret);
                return ret;
        }

        switch (param) {
        case PIN_CONFIG_BIAS_BUS_HOLD:
                conf[1] &= MADERA_GP1_PU_MASK | MADERA_GP1_PD_MASK;
                if (conf[1] == (MADERA_GP1_PU | MADERA_GP1_PD))
                        result = 1;
                break;
        case PIN_CONFIG_BIAS_DISABLE:
                conf[1] &= MADERA_GP1_PU_MASK | MADERA_GP1_PD_MASK;
                if (!conf[1])
                        result = 1;
                break;
        case PIN_CONFIG_BIAS_PULL_DOWN:
                conf[1] &= MADERA_GP1_PU_MASK | MADERA_GP1_PD_MASK;
                if (conf[1] == MADERA_GP1_PD_MASK)
                        result = 1;
                break;
        case PIN_CONFIG_BIAS_PULL_UP:
                conf[1] &= MADERA_GP1_PU_MASK | MADERA_GP1_PD_MASK;
                if (conf[1] == MADERA_GP1_PU_MASK)
                        result = 1;
                break;
        case PIN_CONFIG_DRIVE_OPEN_DRAIN:
                if (conf[0] & MADERA_GP1_OP_CFG_MASK)
                        result = 1;
                break;
        case PIN_CONFIG_DRIVE_PUSH_PULL:
                if (!(conf[0] & MADERA_GP1_OP_CFG_MASK))
                        result = 1;
                break;
        case PIN_CONFIG_DRIVE_STRENGTH:
                result = madera_pin_unmake_drv_str(priv, conf[1]);
                break;
        case PIN_CONFIG_INPUT_DEBOUNCE:
                if (conf[0] & MADERA_GP1_DB_MASK)
                        result = 1;
                break;
        case PIN_CONFIG_INPUT_ENABLE:
                if (conf[0] & MADERA_GP1_DIR_MASK)
                        result = 1;
                break;
        case PIN_CONFIG_INPUT_SCHMITT:
        case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
                if (conf[0] & MADERA_GP1_IP_CFG_MASK)
                        result = 1;
                break;
        case PIN_CONFIG_LEVEL:
                if ((conf[1] & MADERA_GP1_DIR_MASK) &&
                    (conf[0] & MADERA_GP1_LVL_MASK))
                        result = 1;
                break;
        default:
                return -ENOTSUPP;
        }

        *config = pinconf_to_config_packed(param, result);

        return 0;
}

static int madera_pin_conf_set(struct pinctrl_dev *pctldev, unsigned int pin,
                               unsigned long *configs, unsigned int num_configs)
{
        struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);
        u16 conf[2] = {0, 0};
        u16 mask[2] = {0, 0};
        unsigned int reg = MADERA_GPIO1_CTRL_1 + (2 * pin);
        unsigned int val;
        int ret;

        while (num_configs) {
                dev_dbg(priv->dev, "%s config 0x%lx\n", __func__, *configs);

                switch (pinconf_to_config_param(*configs)) {
                case PIN_CONFIG_BIAS_BUS_HOLD:
                        mask[1] |= MADERA_GP1_PU_MASK | MADERA_GP1_PD_MASK;
                        conf[1] |= MADERA_GP1_PU | MADERA_GP1_PD;
                        break;
                case PIN_CONFIG_BIAS_DISABLE:
                        mask[1] |= MADERA_GP1_PU_MASK | MADERA_GP1_PD_MASK;
                        conf[1] &= ~(MADERA_GP1_PU | MADERA_GP1_PD);
                        break;
                case PIN_CONFIG_BIAS_PULL_DOWN:
                        mask[1] |= MADERA_GP1_PU_MASK | MADERA_GP1_PD_MASK;
                        conf[1] |= MADERA_GP1_PD;
                        conf[1] &= ~MADERA_GP1_PU;
                        break;
                case PIN_CONFIG_BIAS_PULL_UP:
                        mask[1] |= MADERA_GP1_PU_MASK | MADERA_GP1_PD_MASK;
                        conf[1] |= MADERA_GP1_PU;
                        conf[1] &= ~MADERA_GP1_PD;
                        break;
                case PIN_CONFIG_DRIVE_OPEN_DRAIN:
                        mask[0] |= MADERA_GP1_OP_CFG_MASK;
                        conf[0] |= MADERA_GP1_OP_CFG;
                        break;
                case PIN_CONFIG_DRIVE_PUSH_PULL:
                        mask[0] |= MADERA_GP1_OP_CFG_MASK;
                        conf[0] &= ~MADERA_GP1_OP_CFG;
                        break;
                case PIN_CONFIG_DRIVE_STRENGTH:
                        val = pinconf_to_config_argument(*configs);
                        mask[1] |= MADERA_GP1_DRV_STR_MASK;
                        conf[1] &= ~MADERA_GP1_DRV_STR_MASK;
                        conf[1] |= madera_pin_make_drv_str(priv, val);
                        break;
                case PIN_CONFIG_INPUT_DEBOUNCE:
                        mask[0] |= MADERA_GP1_DB_MASK;

                        /*
                         * we can't configure debounce time per-pin so value
                         * is just a flag
                         */
                        val = pinconf_to_config_argument(*configs);
                        if (val)
                                conf[0] |= MADERA_GP1_DB;
                        else
                                conf[0] &= ~MADERA_GP1_DB;
                        break;
                case PIN_CONFIG_INPUT_ENABLE:
                        val = pinconf_to_config_argument(*configs);
                        mask[1] |= MADERA_GP1_DIR_MASK;
                        if (val)
                                conf[1] |= MADERA_GP1_DIR;
                        else
                                conf[1] &= ~MADERA_GP1_DIR;
                        break;
                case PIN_CONFIG_INPUT_SCHMITT:
                        val = pinconf_to_config_argument(*configs);
                        mask[0] |= MADERA_GP1_IP_CFG;
                        if (val)
                                conf[0] |= MADERA_GP1_IP_CFG;
                        else
                                conf[0] &= ~MADERA_GP1_IP_CFG;

                        mask[1] |= MADERA_GP1_DIR_MASK;
                        conf[1] |= MADERA_GP1_DIR;
                        break;
                case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
                        mask[0] |= MADERA_GP1_IP_CFG;
                        conf[0] |= MADERA_GP1_IP_CFG;
                        mask[1] |= MADERA_GP1_DIR_MASK;
                        conf[1] |= MADERA_GP1_DIR;
                        break;
                case PIN_CONFIG_LEVEL:
                        val = pinconf_to_config_argument(*configs);
                        mask[0] |= MADERA_GP1_LVL_MASK;
                        if (val)
                                conf[0] |= MADERA_GP1_LVL;
                        else
                                conf[0] &= ~MADERA_GP1_LVL;

                        mask[1] |= MADERA_GP1_DIR_MASK;
                        conf[1] &= ~MADERA_GP1_DIR;
                        break;
                default:
                        return -ENOTSUPP;
                }

                ++configs;
                --num_configs;
        }

        dev_dbg(priv->dev,
                "%s gpio%d 0x%x:0x%x 0x%x:0x%x\n",
                __func__, pin + 1, reg, conf[0], reg + 1, conf[1]);

        ret = regmap_update_bits(priv->madera->regmap, reg, mask[0], conf[0]);
        if (ret)
                goto err;

        ++reg;
        ret = regmap_update_bits(priv->madera->regmap, reg, mask[1], conf[1]);
        if (ret)
                goto err;

        return 0;

err:
        dev_err(priv->dev,
                "Failed to write GPIO%d conf (%d) reg 0x%x\n",
                pin + 1, ret, reg);

        return ret;
}

static int madera_pin_conf_group_set(struct pinctrl_dev *pctldev,
                                     unsigned int selector,
                                     unsigned long *configs,
                                     unsigned int num_configs)
{
        struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);
        const struct madera_pin_groups *pin_group;
        unsigned int n_groups = priv->chip->n_pin_groups;
        int i, ret;

        dev_dbg(priv->dev, "%s setting group %s\n", __func__,
                madera_get_group_name(pctldev, selector));

        if (selector >= n_groups) {
                /* group is a single pin, convert to pin number and set */
                return madera_pin_conf_set(pctldev,
                                           selector - n_groups,
                                           configs,
                                           num_configs);
        } else {
                pin_group = &priv->chip->pin_groups[selector];

                for (i = 0; i < pin_group->n_pins; ++i) {
                        ret = madera_pin_conf_set(pctldev,
                                                  pin_group->pins[i],
                                                  configs,
                                                  num_configs);
                        if (ret)
                                return ret;
                }
        }

        return 0;
}

static const struct pinconf_ops madera_pin_conf_ops = {
        .is_generic = true,
        .pin_config_get = madera_pin_conf_get,
        .pin_config_set = madera_pin_conf_set,
        .pin_config_group_set = madera_pin_conf_group_set,
};

static struct pinctrl_desc madera_pin_desc = {
        .name = "madera-pinctrl",
        .pins = madera_pins,
        .pctlops = &madera_pin_group_ops,
        .pmxops = &madera_pin_mux_ops,
        .confops = &madera_pin_conf_ops,
        .owner = THIS_MODULE,
};

static int madera_pin_probe(struct platform_device *pdev)
{
        struct madera *madera = dev_get_drvdata(pdev->dev.parent);
        const struct madera_pdata *pdata = &madera->pdata;
        struct madera_pin_private *priv;
        int ret;

        BUILD_BUG_ON(ARRAY_SIZE(madera_pin_single_group_names) !=
                     ARRAY_SIZE(madera_pin_single_group_pins));

        dev_dbg(&pdev->dev, "%s\n", __func__);

        device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent));

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

        priv->dev = &pdev->dev;
        priv->madera = madera;

        switch (madera->type) {
        case CS47L15:
                if (IS_ENABLED(CONFIG_PINCTRL_CS47L15))
                        priv->chip = &cs47l15_pin_chip;
                break;
        case CS47L35:
                if (IS_ENABLED(CONFIG_PINCTRL_CS47L35))
                        priv->chip = &cs47l35_pin_chip;
                break;
        case CS47L85:
        case WM1840:
                if (IS_ENABLED(CONFIG_PINCTRL_CS47L85))
                        priv->chip = &cs47l85_pin_chip;
                break;
        case CS47L90:
        case CS47L91:
                if (IS_ENABLED(CONFIG_PINCTRL_CS47L90))
                        priv->chip = &cs47l90_pin_chip;
                break;
        case CS42L92:
        case CS47L92:
        case CS47L93:
                if (IS_ENABLED(CONFIG_PINCTRL_CS47L92))
                        priv->chip = &cs47l92_pin_chip;
                break;
        default:
                break;
        }

        if (!priv->chip)
                return -ENODEV;

        madera_pin_desc.npins = priv->chip->n_pins;

        ret = devm_pinctrl_register_and_init(&pdev->dev,
                                             &madera_pin_desc,
                                             priv,
                                             &priv->pctl);
        if (ret) {
                dev_err(priv->dev, "Failed pinctrl register (%d)\n", ret);
                return ret;
        }

        /* if the configuration is provided through pdata, apply it */
        if (pdata->gpio_configs) {
                ret = devm_pinctrl_register_mappings(priv->dev,
                                                     pdata->gpio_configs,
                                                     pdata->n_gpio_configs);
                if (ret)
                        return dev_err_probe(priv->dev, ret,
                                                "Failed to register pdata mappings\n");
        }

        ret = pinctrl_enable(priv->pctl);
        if (ret) {
                dev_err(priv->dev, "Failed to enable pinctrl (%d)\n", ret);
                return ret;
        }

        platform_set_drvdata(pdev, priv);

        dev_dbg(priv->dev, "pinctrl probed ok\n");

        return 0;
}

static struct platform_driver madera_pin_driver = {
        .probe = madera_pin_probe,
        .driver = {
                .name = "madera-pinctrl",
        },
};

module_platform_driver(madera_pin_driver);

MODULE_DESCRIPTION("Madera pinctrl driver");
MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
MODULE_LICENSE("GPL v2");