// SPDX-License-Identifier: GPL-2.0+
//
// Copyright (c) 2019 Mantas Pucka <mantas@8devices.com>
// Copyright (c) 2019 Robert Marko <robert.marko@sartura.hr>
//
// Driver for IPQ4019 SD/MMC controller's I/O LDO voltage regulator

#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>

static const unsigned int ipq4019_vmmc_voltages[] = {
        1500000, 1800000, 2500000, 3000000,
};

static const struct regulator_ops ipq4019_regulator_voltage_ops = {
        .list_voltage = regulator_list_voltage_table,
        .map_voltage = regulator_map_voltage_ascend,
        .get_voltage_sel = regulator_get_voltage_sel_regmap,
        .set_voltage_sel = regulator_set_voltage_sel_regmap,
};

static const struct regulator_desc vmmc_regulator = {
        .name           = "vmmcq",
        .ops            = &ipq4019_regulator_voltage_ops,
        .type           = REGULATOR_VOLTAGE,
        .owner          = THIS_MODULE,
        .volt_table     = ipq4019_vmmc_voltages,
        .n_voltages     = ARRAY_SIZE(ipq4019_vmmc_voltages),
        .vsel_reg       = 0,
        .vsel_mask      = 0x3,
};

static const struct regmap_config ipq4019_vmmcq_regmap_config = {
        .reg_bits       = 32,
        .reg_stride     = 4,
        .val_bits       = 32,
};

static int ipq4019_regulator_probe(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct regulator_init_data *init_data;
        struct regulator_config cfg = {};
        struct regulator_dev *rdev;
        struct regmap *rmap;
        void __iomem *base;

        init_data = of_get_regulator_init_data(dev, dev->of_node,
                                               &vmmc_regulator);
        if (!init_data)
                return -EINVAL;

        base = devm_platform_ioremap_resource(pdev, 0);
        if (IS_ERR(base))
                return PTR_ERR(base);

        rmap = devm_regmap_init_mmio(dev, base, &ipq4019_vmmcq_regmap_config);
        if (IS_ERR(rmap))
                return PTR_ERR(rmap);

        cfg.dev = dev;
        cfg.init_data = init_data;
        cfg.of_node = dev->of_node;
        cfg.regmap = rmap;

        rdev = devm_regulator_register(dev, &vmmc_regulator, &cfg);
        if (IS_ERR(rdev)) {
                dev_err(dev, "Failed to register regulator: %ld\n",
                        PTR_ERR(rdev));
                return PTR_ERR(rdev);
        }
        platform_set_drvdata(pdev, rdev);

        return 0;
}

static const struct of_device_id regulator_ipq4019_of_match[] = {
        { .compatible = "qcom,vqmmc-ipq4019-regulator", },
        {},
};
MODULE_DEVICE_TABLE(of, regulator_ipq4019_of_match);

static struct platform_driver ipq4019_regulator_driver = {
        .probe = ipq4019_regulator_probe,
        .driver = {
                .name = "vqmmc-ipq4019-regulator",
                .probe_type = PROBE_PREFER_ASYNCHRONOUS,
                .of_match_table = of_match_ptr(regulator_ipq4019_of_match),
        },
};
module_platform_driver(ipq4019_regulator_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mantas Pucka <mantas@8devices.com>");
MODULE_DESCRIPTION("IPQ4019 VQMMC voltage regulator");