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 
17 static const unsigned int ipq4019_vmmc_voltages[] = {
18 	1500000, 1800000, 2500000, 3000000,
19 };
20 
21 static 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 
28 static 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 
39 static const struct regmap_config ipq4019_vmmcq_regmap_config = {
40 	.reg_bits	= 32,
41 	.reg_stride	= 4,
42 	.val_bits	= 32,
43 };
44 
ipq4019_regulator_probe(struct platform_device * pdev)45 static 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 
83 static const struct of_device_id regulator_ipq4019_of_match[] = {
84 	{ .compatible = "qcom,vqmmc-ipq4019-regulator", },
85 	{},
86 };
87 MODULE_DEVICE_TABLE(of, regulator_ipq4019_of_match);
88 
89 static struct platform_driver ipq4019_regulator_driver = {
90 	.probe = ipq4019_regulator_probe,
91 	.driver = {
92 		.name = "vqmmc-ipq4019-regulator",
93 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
94 		.of_match_table = of_match_ptr(regulator_ipq4019_of_match),
95 	},
96 };
97 module_platform_driver(ipq4019_regulator_driver);
98 
99 MODULE_LICENSE("GPL");
100 MODULE_AUTHOR("Mantas Pucka <mantas@8devices.com>");
101 MODULE_DESCRIPTION("IPQ4019 VQMMC voltage regulator");
102