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 regmap *rmap;
52	void __iomem *base;
53
54	init_data = of_get_regulator_init_data(dev, dev->of_node,
55					       &vmmc_regulator);
56	if (!init_data)
57		return -EINVAL;
58
59	base = devm_platform_ioremap_resource(pdev, 0);
60	if (IS_ERR(base))
61		return PTR_ERR(base);
62
63	rmap = devm_regmap_init_mmio(dev, base, &ipq4019_vmmcq_regmap_config);
64	if (IS_ERR(rmap))
65		return PTR_ERR(rmap);
66
67	cfg.dev = dev;
68	cfg.init_data = init_data;
69	cfg.of_node = dev->of_node;
70	cfg.regmap = rmap;
71
72	rdev = devm_regulator_register(dev, &vmmc_regulator, &cfg);
73	if (IS_ERR(rdev)) {
74		dev_err(dev, "Failed to register regulator: %ld\n",
75			PTR_ERR(rdev));
76		return PTR_ERR(rdev);
77	}
78	platform_set_drvdata(pdev, rdev);
79
80	return 0;
81}
82
83static const struct of_device_id regulator_ipq4019_of_match[] = {
84	{ .compatible = "qcom,vqmmc-ipq4019-regulator", },
85	{},
86};
87
88static struct platform_driver ipq4019_regulator_driver = {
89	.probe = ipq4019_regulator_probe,
90	.driver = {
91		.name = "vqmmc-ipq4019-regulator",
92		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
93		.of_match_table = of_match_ptr(regulator_ipq4019_of_match),
94	},
95};
96module_platform_driver(ipq4019_regulator_driver);
97
98MODULE_LICENSE("GPL");
99MODULE_AUTHOR("Mantas Pucka <mantas@8devices.com>");
100MODULE_DESCRIPTION("IPQ4019 VQMMC voltage regulator");
101