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 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
85 static const struct of_device_id regulator_ipq4019_of_match[] = {
86 { .compatible = "qcom,vqmmc-ipq4019-regulator", },
87 {},
88 };
89
90 static 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 };
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