// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2016 Google, Inc
 * Written by Simon Glass <sjg@chromium.org>
 */

#include <common.h>
#include <clk.h>
#include <div64.h>
#include <dm.h>
#include <log.h>
#include <pwm.h>
#include <regmap.h>
#include <syscon.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <asm/arch-rockchip/pwm.h>
#include <linux/bitops.h>
#include <power/regulator.h>

DECLARE_GLOBAL_DATA_PTR;

struct rockchip_pwm_data {
        struct rockchip_pwm_regs regs;
        unsigned int prescaler;
        bool supports_polarity;
        bool supports_lock;
        u32 enable_conf;
        u32 enable_conf_mask;
};

struct rk_pwm_priv {
        fdt_addr_t base;
        ulong freq;
        u32 conf_polarity;
        const struct rockchip_pwm_data *data;
};

static int rk_pwm_set_invert(struct udevice *dev, uint channel, bool polarity)
{
        struct rk_pwm_priv *priv = dev_get_priv(dev);

        if (!priv->data->supports_polarity) {
                debug("%s: Do not support polarity\n", __func__);
                return 0;
        }

        debug("%s: polarity=%u\n", __func__, polarity);
        if (polarity)
                priv->conf_polarity = PWM_DUTY_NEGATIVE | PWM_INACTIVE_POSTIVE;
        else
                priv->conf_polarity = PWM_DUTY_POSTIVE | PWM_INACTIVE_NEGATIVE;

        return 0;
}

static int rk_pwm_set_config(struct udevice *dev, uint channel, uint period_ns,
                             uint duty_ns)
{
        struct rk_pwm_priv *priv = dev_get_priv(dev);
        const struct rockchip_pwm_regs *regs = &priv->data->regs;
        unsigned long period, duty;
        u32 ctrl;

        debug("%s: period_ns=%u, duty_ns=%u\n", __func__, period_ns, duty_ns);

        ctrl = readl(priv->base + regs->ctrl);
        /*
         * Lock the period and duty of previous configuration, then
         * change the duty and period, that would not be effective.
         */
        if (priv->data->supports_lock) {
                ctrl |= PWM_LOCK;
                writel(ctrl, priv->base + regs->ctrl);
        }

        period = lldiv((uint64_t)priv->freq * period_ns,
                       priv->data->prescaler * 1000000000);
        duty = lldiv((uint64_t)priv->freq * duty_ns,
                     priv->data->prescaler * 1000000000);

        writel(period, priv->base + regs->period);
        writel(duty, priv->base + regs->duty);

        if (priv->data->supports_polarity) {
                ctrl &= ~(PWM_DUTY_MASK | PWM_INACTIVE_MASK);
                ctrl |= priv->conf_polarity;
        }

        /*
         * Unlock and set polarity at the same time,
         * the configuration of duty, period and polarity
         * would be effective together at next period.
         */
        if (priv->data->supports_lock)
                ctrl &= ~PWM_LOCK;
        writel(ctrl, priv->base + regs->ctrl);

        debug("%s: period=%lu, duty=%lu\n", __func__, period, duty);

        return 0;
}

static int rk_pwm_set_enable(struct udevice *dev, uint channel, bool enable)
{
        struct rk_pwm_priv *priv = dev_get_priv(dev);
        const struct rockchip_pwm_regs *regs = &priv->data->regs;
        u32 ctrl;

        debug("%s: Enable '%s'\n", __func__, dev->name);

        ctrl = readl(priv->base + regs->ctrl);
        ctrl &= ~priv->data->enable_conf_mask;

        if (enable)
                ctrl |= priv->data->enable_conf;
        else
                ctrl &= ~priv->data->enable_conf;

        writel(ctrl, priv->base + regs->ctrl);

        return 0;
}

static int rk_pwm_of_to_plat(struct udevice *dev)
{
        struct rk_pwm_priv *priv = dev_get_priv(dev);

        priv->base = dev_read_addr(dev);

        return 0;
}

static int rk_pwm_probe(struct udevice *dev)
{
        struct rk_pwm_priv *priv = dev_get_priv(dev);
        struct clk clk;
        int ret = 0;

        ret = clk_get_by_index(dev, 0, &clk);
        if (ret < 0) {
                debug("%s get clock fail!\n", __func__);
                return -EINVAL;
        }

        priv->freq = clk_get_rate(&clk);
        priv->data = (struct rockchip_pwm_data *)dev_get_driver_data(dev);

        if (priv->data->supports_polarity)
                priv->conf_polarity = PWM_DUTY_POSTIVE | PWM_INACTIVE_NEGATIVE;

        return 0;
}

static const struct pwm_ops rk_pwm_ops = {
        .set_invert     = rk_pwm_set_invert,
        .set_config     = rk_pwm_set_config,
        .set_enable     = rk_pwm_set_enable,
};

static const struct rockchip_pwm_data pwm_data_v1 = {
        .regs = {
                .duty = 0x04,
                .period = 0x08,
                .cntr = 0x00,
                .ctrl = 0x0c,
        },
        .prescaler = 2,
        .supports_polarity = false,
        .supports_lock = false,
        .enable_conf = PWM_CTRL_OUTPUT_EN | PWM_CTRL_TIMER_EN,
        .enable_conf_mask = BIT(1) | BIT(3),
};

static const struct rockchip_pwm_data pwm_data_v2 = {
        .regs = {
                .duty = 0x08,
                .period = 0x04,
                .cntr = 0x00,
                .ctrl = 0x0c,
        },
        .prescaler = 1,
        .supports_polarity = true,
        .supports_lock = false,
        .enable_conf = PWM_OUTPUT_LEFT | PWM_LP_DISABLE | RK_PWM_ENABLE |
                       PWM_CONTINUOUS,
        .enable_conf_mask = GENMASK(2, 0) | BIT(5) | BIT(8),
};

static const struct rockchip_pwm_data pwm_data_v3 = {
        .regs = {
                .duty = 0x08,
                .period = 0x04,
                .cntr = 0x00,
                .ctrl = 0x0c,
        },
        .prescaler = 1,
        .supports_polarity = true,
        .supports_lock = true,
        .enable_conf = PWM_OUTPUT_LEFT | PWM_LP_DISABLE | RK_PWM_ENABLE |
                       PWM_CONTINUOUS,
        .enable_conf_mask = GENMASK(2, 0) | BIT(5) | BIT(8),
};

static const struct udevice_id rk_pwm_ids[] = {
        { .compatible = "rockchip,rk2928-pwm", .data = (ulong)&pwm_data_v1},
        { .compatible = "rockchip,rk3288-pwm", .data = (ulong)&pwm_data_v2},
        { .compatible = "rockchip,rk3328-pwm", .data = (ulong)&pwm_data_v3},
        { }
};

U_BOOT_DRIVER(rk_pwm) = {
        .name   = "rk_pwm",
        .id     = UCLASS_PWM,
        .of_match = rk_pwm_ids,
        .ops    = &rk_pwm_ops,
        .of_to_plat     = rk_pwm_of_to_plat,
        .probe          = rk_pwm_probe,
        .priv_auto      = sizeof(struct rk_pwm_priv),
};