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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 | ||
f72c5835 | 21 | static const struct regulator_ops ipq4019_regulator_voltage_ops = { |
ebf652b4 | 22 | .list_voltage = regulator_list_voltage_table, |
f72c5835 | 23 | .map_voltage = regulator_map_voltage_ascend, |
ebf652b4 RM |
24 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
25 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
26 | }; | |
27 | ||
f72c5835 | 28 | static const struct regulator_desc vmmc_regulator = { |
ebf652b4 RM |
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 | ||
f72c5835 | 39 | static const struct regmap_config ipq4019_vmmcq_regmap_config = { |
ebf652b4 RM |
40 | .reg_bits = 32, |
41 | .reg_stride = 4, | |
42 | .val_bits = 32, | |
43 | }; | |
44 | ||
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 | ||
ebf652b4 RM |
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, | |
ebf652b4 RM |
92 | .driver = { |
93 | .name = "vqmmc-ipq4019-regulator", | |
ebf652b4 RM |
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"); |