1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0+
2*4882a593Smuzhiyun //
3*4882a593Smuzhiyun // Copyright (c) 2019 Mantas Pucka <mantas@8devices.com>
4*4882a593Smuzhiyun // Copyright (c) 2019 Robert Marko <robert.marko@sartura.hr>
5*4882a593Smuzhiyun //
6*4882a593Smuzhiyun // Driver for IPQ4019 SD/MMC controller's I/O LDO voltage regulator
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/io.h>
9*4882a593Smuzhiyun #include <linux/module.h>
10*4882a593Smuzhiyun #include <linux/of.h>
11*4882a593Smuzhiyun #include <linux/platform_device.h>
12*4882a593Smuzhiyun #include <linux/regmap.h>
13*4882a593Smuzhiyun #include <linux/regulator/driver.h>
14*4882a593Smuzhiyun #include <linux/regulator/machine.h>
15*4882a593Smuzhiyun #include <linux/regulator/of_regulator.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun static const unsigned int ipq4019_vmmc_voltages[] = {
18*4882a593Smuzhiyun 1500000, 1800000, 2500000, 3000000,
19*4882a593Smuzhiyun };
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun static const struct regulator_ops ipq4019_regulator_voltage_ops = {
22*4882a593Smuzhiyun .list_voltage = regulator_list_voltage_table,
23*4882a593Smuzhiyun .map_voltage = regulator_map_voltage_ascend,
24*4882a593Smuzhiyun .get_voltage_sel = regulator_get_voltage_sel_regmap,
25*4882a593Smuzhiyun .set_voltage_sel = regulator_set_voltage_sel_regmap,
26*4882a593Smuzhiyun };
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun static const struct regulator_desc vmmc_regulator = {
29*4882a593Smuzhiyun .name = "vmmcq",
30*4882a593Smuzhiyun .ops = &ipq4019_regulator_voltage_ops,
31*4882a593Smuzhiyun .type = REGULATOR_VOLTAGE,
32*4882a593Smuzhiyun .owner = THIS_MODULE,
33*4882a593Smuzhiyun .volt_table = ipq4019_vmmc_voltages,
34*4882a593Smuzhiyun .n_voltages = ARRAY_SIZE(ipq4019_vmmc_voltages),
35*4882a593Smuzhiyun .vsel_reg = 0,
36*4882a593Smuzhiyun .vsel_mask = 0x3,
37*4882a593Smuzhiyun };
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun static const struct regmap_config ipq4019_vmmcq_regmap_config = {
40*4882a593Smuzhiyun .reg_bits = 32,
41*4882a593Smuzhiyun .reg_stride = 4,
42*4882a593Smuzhiyun .val_bits = 32,
43*4882a593Smuzhiyun };
44*4882a593Smuzhiyun
ipq4019_regulator_probe(struct platform_device * pdev)45*4882a593Smuzhiyun static int ipq4019_regulator_probe(struct platform_device *pdev)
46*4882a593Smuzhiyun {
47*4882a593Smuzhiyun struct device *dev = &pdev->dev;
48*4882a593Smuzhiyun struct regulator_init_data *init_data;
49*4882a593Smuzhiyun struct regulator_config cfg = {};
50*4882a593Smuzhiyun struct regulator_dev *rdev;
51*4882a593Smuzhiyun struct resource *res;
52*4882a593Smuzhiyun struct regmap *rmap;
53*4882a593Smuzhiyun void __iomem *base;
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun init_data = of_get_regulator_init_data(dev, dev->of_node,
56*4882a593Smuzhiyun &vmmc_regulator);
57*4882a593Smuzhiyun if (!init_data)
58*4882a593Smuzhiyun return -EINVAL;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
61*4882a593Smuzhiyun base = devm_ioremap_resource(dev, res);
62*4882a593Smuzhiyun if (IS_ERR(base))
63*4882a593Smuzhiyun return PTR_ERR(base);
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun rmap = devm_regmap_init_mmio(dev, base, &ipq4019_vmmcq_regmap_config);
66*4882a593Smuzhiyun if (IS_ERR(rmap))
67*4882a593Smuzhiyun return PTR_ERR(rmap);
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun cfg.dev = dev;
70*4882a593Smuzhiyun cfg.init_data = init_data;
71*4882a593Smuzhiyun cfg.of_node = dev->of_node;
72*4882a593Smuzhiyun cfg.regmap = rmap;
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun rdev = devm_regulator_register(dev, &vmmc_regulator, &cfg);
75*4882a593Smuzhiyun if (IS_ERR(rdev)) {
76*4882a593Smuzhiyun dev_err(dev, "Failed to register regulator: %ld\n",
77*4882a593Smuzhiyun PTR_ERR(rdev));
78*4882a593Smuzhiyun return PTR_ERR(rdev);
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun platform_set_drvdata(pdev, rdev);
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun return 0;
83*4882a593Smuzhiyun }
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun static const struct of_device_id regulator_ipq4019_of_match[] = {
86*4882a593Smuzhiyun { .compatible = "qcom,vqmmc-ipq4019-regulator", },
87*4882a593Smuzhiyun {},
88*4882a593Smuzhiyun };
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun static struct platform_driver ipq4019_regulator_driver = {
91*4882a593Smuzhiyun .probe = ipq4019_regulator_probe,
92*4882a593Smuzhiyun .driver = {
93*4882a593Smuzhiyun .name = "vqmmc-ipq4019-regulator",
94*4882a593Smuzhiyun .of_match_table = of_match_ptr(regulator_ipq4019_of_match),
95*4882a593Smuzhiyun },
96*4882a593Smuzhiyun };
97*4882a593Smuzhiyun module_platform_driver(ipq4019_regulator_driver);
98*4882a593Smuzhiyun
99*4882a593Smuzhiyun MODULE_LICENSE("GPL");
100*4882a593Smuzhiyun MODULE_AUTHOR("Mantas Pucka <mantas@8devices.com>");
101*4882a593Smuzhiyun MODULE_DESCRIPTION("IPQ4019 VQMMC voltage regulator");
102