// 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 resource *res;
	struct regmap *rmap;
	void __iomem *base;

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

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	base = devm_ioremap_resource(dev, res);
	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",
		.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");