/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Pin controller and GPIO driver for Amlogic Meson SoCs
 *
 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
 */

#include <linux/gpio/driver.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/types.h>

/**
 * struct meson_pmx_group - a pinmux group
 *
 * @name:       group name
 * @pins:       pins in the group
 * @num_pins:   number of pins in the group
 * @is_gpio:    whether the group is a single GPIO group
 * @reg:        register offset for the group in the domain mux registers
 * @bit         bit index enabling the group
 * @domain:     index of the domain this group belongs to
 */
struct meson_pmx_group {
        const char *name;
        const unsigned int *pins;
        unsigned int num_pins;
        const void *data;
};

/**
 * struct meson_pmx_func - a pinmux function
 *
 * @name:       function name
 * @groups:     groups in the function
 * @num_groups: number of groups in the function
 */
struct meson_pmx_func {
        const char *name;
        const char * const *groups;
        unsigned int num_groups;
};

/**
 * struct meson_reg_desc - a register descriptor
 *
 * @reg:        register offset in the regmap
 * @bit:        bit index in register
 *
 * The structure describes the information needed to control pull,
 * pull-enable, direction, etc. for a single pin
 */
struct meson_reg_desc {
        unsigned int reg;
        unsigned int bit;
};

/**
 * enum meson_reg_type - type of registers encoded in @meson_reg_desc
 */
enum meson_reg_type {
        REG_PULLEN,
        REG_PULL,
        REG_DIR,
        REG_OUT,
        REG_IN,
        REG_DS,
        NUM_REG,
};

/**
 * enum meson_pinconf_drv - value of drive-strength supported
 */
enum meson_pinconf_drv {
        MESON_PINCONF_DRV_500UA,
        MESON_PINCONF_DRV_2500UA,
        MESON_PINCONF_DRV_3000UA,
        MESON_PINCONF_DRV_4000UA,
};

/**
 * struct meson bank
 *
 * @name:       bank name
 * @first:      first pin of the bank
 * @last:       last pin of the bank
 * @irq:        hwirq base number of the bank
 * @regs:       array of register descriptors
 *
 * A bank represents a set of pins controlled by a contiguous set of
 * bits in the domain registers. The structure specifies which bits in
 * the regmap control the different functionalities. Each member of
 * the @regs array refers to the first pin of the bank.
 */
struct meson_bank {
        const char *name;
        unsigned int first;
        unsigned int last;
        int irq_first;
        int irq_last;
        struct meson_reg_desc regs[NUM_REG];
};

struct meson_pinctrl_data {
        const char *name;
        const struct pinctrl_pin_desc *pins;
        struct meson_pmx_group *groups;
        struct meson_pmx_func *funcs;
        unsigned int num_pins;
        unsigned int num_groups;
        unsigned int num_funcs;
        struct meson_bank *banks;
        unsigned int num_banks;
        const struct pinmux_ops *pmx_ops;
        void *pmx_data;
};

struct meson_pinctrl {
        struct device *dev;
        struct pinctrl_dev *pcdev;
        struct pinctrl_desc desc;
        struct meson_pinctrl_data *data;
        struct regmap *reg_mux;
        struct regmap *reg_pullen;
        struct regmap *reg_pull;
        struct regmap *reg_gpio;
        struct regmap *reg_ds;
        struct gpio_chip chip;
        struct device_node *of_node;
};

#define FUNCTION(fn)                                                    \
        {                                                               \
                .name = #fn,                                            \
                .groups = fn ## _groups,                                \
                .num_groups = ARRAY_SIZE(fn ## _groups),                \
        }

#define BANK_DS(n, f, l, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib,     \
                dsr, dsb)                                                      \
        {                                                               \
                .name           = n,                                    \
                .first          = f,                                    \
                .last           = l,                                    \
                .irq_first      = fi,                                   \
                .irq_last       = li,                                   \
                .regs = {                                               \
                        [REG_PULLEN]    = { per, peb },                 \
                        [REG_PULL]      = { pr, pb },                   \
                        [REG_DIR]       = { dr, db },                   \
                        [REG_OUT]       = { or, ob },                   \
                        [REG_IN]        = { ir, ib },                   \
                        [REG_DS]        = { dsr, dsb },                 \
                },                                                      \
         }

#define BANK(n, f, l, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib) \
        BANK_DS(n, f, l, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib, 0, 0)

#define MESON_PIN(x) PINCTRL_PIN(x, #x)

/* Common pmx functions */
int meson_pmx_get_funcs_count(struct pinctrl_dev *pcdev);
const char *meson_pmx_get_func_name(struct pinctrl_dev *pcdev,
                                    unsigned selector);
int meson_pmx_get_groups(struct pinctrl_dev *pcdev,
                         unsigned selector,
                         const char * const **groups,
                         unsigned * const num_groups);

/* Common probe function */
int meson_pinctrl_probe(struct platform_device *pdev);