1// SPDX-License-Identifier: GPL-2.0+
  2//
  3// Copyright (c) 2019 Mantas Pucka <mantas@8devices.com>
  4// Copyright (c) 2019 Robert Marko <robert.marko@sartura.hr>
  5//
  6// Driver for IPQ4019 SD/MMC controller's I/O LDO voltage regulator
  7
  8#include <linux/io.h>
  9#include <linux/module.h>
 10#include <linux/of.h>
 11#include <linux/platform_device.h>
 12#include <linux/regmap.h>
 13#include <linux/regulator/driver.h>
 14#include <linux/regulator/machine.h>
 15#include <linux/regulator/of_regulator.h>
 16
 17static const unsigned int ipq4019_vmmc_voltages[] = {
 18	1500000, 1800000, 2500000, 3000000,
 19};
 20
 21static const struct regulator_ops ipq4019_regulator_voltage_ops = {
 22	.list_voltage = regulator_list_voltage_table,
 23	.map_voltage = regulator_map_voltage_ascend,
 24	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 25	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 26};
 27
 28static const struct regulator_desc vmmc_regulator = {
 29	.name		= "vmmcq",
 30	.ops		= &ipq4019_regulator_voltage_ops,
 31	.type		= REGULATOR_VOLTAGE,
 32	.owner		= THIS_MODULE,
 33	.volt_table	= ipq4019_vmmc_voltages,
 34	.n_voltages	= ARRAY_SIZE(ipq4019_vmmc_voltages),
 35	.vsel_reg	= 0,
 36	.vsel_mask	= 0x3,
 37};
 38
 39static const struct regmap_config ipq4019_vmmcq_regmap_config = {
 40	.reg_bits	= 32,
 41	.reg_stride	= 4,
 42	.val_bits	= 32,
 43};
 44
 45static int ipq4019_regulator_probe(struct platform_device *pdev)
 46{
 47	struct device *dev = &pdev->dev;
 48	struct regulator_init_data *init_data;
 49	struct regulator_config cfg = {};
 50	struct regulator_dev *rdev;
 51	struct resource *res;
 52	struct regmap *rmap;
 53	void __iomem *base;
 54
 55	init_data = of_get_regulator_init_data(dev, dev->of_node,
 56					       &vmmc_regulator);
 57	if (!init_data)
 58		return -EINVAL;
 59
 60	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 61	base = devm_ioremap_resource(dev, res);
 62	if (IS_ERR(base))
 63		return PTR_ERR(base);
 64
 65	rmap = devm_regmap_init_mmio(dev, base, &ipq4019_vmmcq_regmap_config);
 66	if (IS_ERR(rmap))
 67		return PTR_ERR(rmap);
 68
 69	cfg.dev = dev;
 70	cfg.init_data = init_data;
 71	cfg.of_node = dev->of_node;
 72	cfg.regmap = rmap;
 73
 74	rdev = devm_regulator_register(dev, &vmmc_regulator, &cfg);
 75	if (IS_ERR(rdev)) {
 76		dev_err(dev, "Failed to register regulator: %ld\n",
 77			PTR_ERR(rdev));
 78		return PTR_ERR(rdev);
 79	}
 80	platform_set_drvdata(pdev, rdev);
 81
 82	return 0;
 83}
 84
 85static const struct of_device_id regulator_ipq4019_of_match[] = {
 86	{ .compatible = "qcom,vqmmc-ipq4019-regulator", },
 87	{},
 88};
 89
 90static struct platform_driver ipq4019_regulator_driver = {
 91	.probe = ipq4019_regulator_probe,
 92	.driver = {
 93		.name = "vqmmc-ipq4019-regulator",
 94		.of_match_table = of_match_ptr(regulator_ipq4019_of_match),
 95	},
 96};
 97module_platform_driver(ipq4019_regulator_driver);
 98
 99MODULE_LICENSE("GPL");
100MODULE_AUTHOR("Mantas Pucka <mantas@8devices.com>");
101MODULE_DESCRIPTION("IPQ4019 VQMMC voltage regulator");