1// SPDX-License-Identifier: GPL-2.0
2//
3// Regulator controller driver for UniPhier SoC
4// Copyright 2018 Socionext Inc.
5// Author: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
6
7#include <linux/clk.h>
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/of_regulator.h>
15#include <linux/reset.h>
16
17#define MAX_CLKS 2
18#define MAX_RSTS 2
19
20struct uniphier_regulator_soc_data {
21 int nclks;
22 const char * const *clock_names;
23 int nrsts;
24 const char * const *reset_names;
25 const struct regulator_desc *desc;
26 const struct regmap_config *regconf;
27};
28
29struct uniphier_regulator_priv {
30 struct clk_bulk_data clk[MAX_CLKS];
31 struct reset_control *rst[MAX_RSTS];
32 const struct uniphier_regulator_soc_data *data;
33};
34
35static const struct regulator_ops uniphier_regulator_ops = {
36 .enable = regulator_enable_regmap,
37 .disable = regulator_disable_regmap,
38 .is_enabled = regulator_is_enabled_regmap,
39};
40
41static int uniphier_regulator_probe(struct platform_device *pdev)
42{
43 struct device *dev = &pdev->dev;
44 struct uniphier_regulator_priv *priv;
45 struct regulator_config config = { };
46 struct regulator_dev *rdev;
47 struct regmap *regmap;
48 void __iomem *base;
49 const char *name;
50 int i, ret, nr;
51
52 priv = devm_kzalloc(dev, size: sizeof(*priv), GFP_KERNEL);
53 if (!priv)
54 return -ENOMEM;
55
56 priv->data = of_device_get_match_data(dev);
57 if (WARN_ON(!priv->data))
58 return -EINVAL;
59
60 base = devm_platform_ioremap_resource(pdev, index: 0);
61 if (IS_ERR(ptr: base))
62 return PTR_ERR(ptr: base);
63
64 for (i = 0; i < priv->data->nclks; i++)
65 priv->clk[i].id = priv->data->clock_names[i];
66 ret = devm_clk_bulk_get(dev, num_clks: priv->data->nclks, clks: priv->clk);
67 if (ret)
68 return ret;
69
70 for (i = 0; i < priv->data->nrsts; i++) {
71 name = priv->data->reset_names[i];
72 priv->rst[i] = devm_reset_control_get_shared(dev, id: name);
73 if (IS_ERR(ptr: priv->rst[i]))
74 return PTR_ERR(ptr: priv->rst[i]);
75 }
76
77 ret = clk_bulk_prepare_enable(num_clks: priv->data->nclks, clks: priv->clk);
78 if (ret)
79 return ret;
80
81 for (nr = 0; nr < priv->data->nrsts; nr++) {
82 ret = reset_control_deassert(rstc: priv->rst[nr]);
83 if (ret)
84 goto out_rst_assert;
85 }
86
87 regmap = devm_regmap_init_mmio(dev, base, priv->data->regconf);
88 if (IS_ERR(ptr: regmap)) {
89 ret = PTR_ERR(ptr: regmap);
90 goto out_rst_assert;
91 }
92
93 config.dev = dev;
94 config.driver_data = priv;
95 config.of_node = dev->of_node;
96 config.regmap = regmap;
97 config.init_data = of_get_regulator_init_data(dev, node: dev->of_node,
98 desc: priv->data->desc);
99 rdev = devm_regulator_register(dev, regulator_desc: priv->data->desc, config: &config);
100 if (IS_ERR(ptr: rdev)) {
101 ret = PTR_ERR(ptr: rdev);
102 goto out_rst_assert;
103 }
104
105 platform_set_drvdata(pdev, data: priv);
106
107 return 0;
108
109out_rst_assert:
110 while (nr--)
111 reset_control_assert(rstc: priv->rst[nr]);
112
113 clk_bulk_disable_unprepare(num_clks: priv->data->nclks, clks: priv->clk);
114
115 return ret;
116}
117
118static void uniphier_regulator_remove(struct platform_device *pdev)
119{
120 struct uniphier_regulator_priv *priv = platform_get_drvdata(pdev);
121 int i;
122
123 for (i = 0; i < priv->data->nrsts; i++)
124 reset_control_assert(rstc: priv->rst[i]);
125
126 clk_bulk_disable_unprepare(num_clks: priv->data->nclks, clks: priv->clk);
127}
128
129/* USB3 controller data */
130#define USB3VBUS_OFFSET 0x0
131#define USB3VBUS_REG BIT(4)
132#define USB3VBUS_REG_EN BIT(3)
133static const struct regulator_desc uniphier_usb3_regulator_desc = {
134 .name = "vbus",
135 .of_match = of_match_ptr("vbus"),
136 .ops = &uniphier_regulator_ops,
137 .type = REGULATOR_VOLTAGE,
138 .owner = THIS_MODULE,
139 .enable_reg = USB3VBUS_OFFSET,
140 .enable_mask = USB3VBUS_REG_EN | USB3VBUS_REG,
141 .enable_val = USB3VBUS_REG_EN | USB3VBUS_REG,
142 .disable_val = USB3VBUS_REG_EN,
143};
144
145static const struct regmap_config uniphier_usb3_regulator_regconf = {
146 .reg_bits = 32,
147 .val_bits = 32,
148 .reg_stride = 4,
149 .max_register = 1,
150};
151
152static const char * const uniphier_pro4_clock_reset_names[] = {
153 "gio", "link",
154};
155
156static const struct uniphier_regulator_soc_data uniphier_pro4_usb3_data = {
157 .nclks = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
158 .clock_names = uniphier_pro4_clock_reset_names,
159 .nrsts = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
160 .reset_names = uniphier_pro4_clock_reset_names,
161 .desc = &uniphier_usb3_regulator_desc,
162 .regconf = &uniphier_usb3_regulator_regconf,
163};
164
165static const char * const uniphier_pxs2_clock_reset_names[] = {
166 "link",
167};
168
169static const struct uniphier_regulator_soc_data uniphier_pxs2_usb3_data = {
170 .nclks = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
171 .clock_names = uniphier_pxs2_clock_reset_names,
172 .nrsts = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
173 .reset_names = uniphier_pxs2_clock_reset_names,
174 .desc = &uniphier_usb3_regulator_desc,
175 .regconf = &uniphier_usb3_regulator_regconf,
176};
177
178static const struct of_device_id uniphier_regulator_match[] = {
179 /* USB VBUS */
180 {
181 .compatible = "socionext,uniphier-pro4-usb3-regulator",
182 .data = &uniphier_pro4_usb3_data,
183 },
184 {
185 .compatible = "socionext,uniphier-pro5-usb3-regulator",
186 .data = &uniphier_pro4_usb3_data,
187 },
188 {
189 .compatible = "socionext,uniphier-pxs2-usb3-regulator",
190 .data = &uniphier_pxs2_usb3_data,
191 },
192 {
193 .compatible = "socionext,uniphier-ld20-usb3-regulator",
194 .data = &uniphier_pxs2_usb3_data,
195 },
196 {
197 .compatible = "socionext,uniphier-pxs3-usb3-regulator",
198 .data = &uniphier_pxs2_usb3_data,
199 },
200 {
201 .compatible = "socionext,uniphier-nx1-usb3-regulator",
202 .data = &uniphier_pxs2_usb3_data,
203 },
204 { /* Sentinel */ },
205};
206MODULE_DEVICE_TABLE(of, uniphier_regulator_match);
207
208static struct platform_driver uniphier_regulator_driver = {
209 .probe = uniphier_regulator_probe,
210 .remove = uniphier_regulator_remove,
211 .driver = {
212 .name = "uniphier-regulator",
213 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
214 .of_match_table = uniphier_regulator_match,
215 },
216};
217module_platform_driver(uniphier_regulator_driver);
218
219MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
220MODULE_DESCRIPTION("UniPhier Regulator Controller Driver");
221MODULE_LICENSE("GPL");
222

source code of linux/drivers/regulator/uniphier-regulator.c