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_device.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 struct resource *res;
49 void __iomem *base;
50 const char *name;
51 int i, ret, nr;
52
53 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
54 if (!priv)
55 return -ENOMEM;
56
57 priv->data = of_device_get_match_data(dev);
58 if (WARN_ON(!priv->data))
59 return -EINVAL;
60
61 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
62 base = devm_ioremap_resource(dev, res);
63 if (IS_ERR(base))
64 return PTR_ERR(base);
65
66 for (i = 0; i < priv->data->nclks; i++)
67 priv->clk[i].id = priv->data->clock_names[i];
68 ret = devm_clk_bulk_get(dev, priv->data->nclks, priv->clk);
69 if (ret)
70 return ret;
71
72 for (i = 0; i < priv->data->nrsts; i++) {
73 name = priv->data->reset_names[i];
74 priv->rst[i] = devm_reset_control_get_shared(dev, name);
75 if (IS_ERR(priv->rst[i]))
76 return PTR_ERR(priv->rst[i]);
77 }
78
79 ret = clk_bulk_prepare_enable(priv->data->nclks, priv->clk);
80 if (ret)
81 return ret;
82
83 for (nr = 0; nr < priv->data->nrsts; nr++) {
84 ret = reset_control_deassert(priv->rst[nr]);
85 if (ret)
86 goto out_rst_assert;
87 }
88
89 regmap = devm_regmap_init_mmio(dev, base, priv->data->regconf);
90 if (IS_ERR(regmap)) {
91 ret = PTR_ERR(regmap);
92 goto out_rst_assert;
93 }
94
95 config.dev = dev;
96 config.driver_data = priv;
97 config.of_node = dev->of_node;
98 config.regmap = regmap;
99 config.init_data = of_get_regulator_init_data(dev, dev->of_node,
100 priv->data->desc);
101 rdev = devm_regulator_register(dev, priv->data->desc, &config);
102 if (IS_ERR(rdev)) {
103 ret = PTR_ERR(rdev);
104 goto out_rst_assert;
105 }
106
107 platform_set_drvdata(pdev, priv);
108
109 return 0;
110
111out_rst_assert:
112 while (nr--)
113 reset_control_assert(priv->rst[nr]);
114
115 clk_bulk_disable_unprepare(priv->data->nclks, priv->clk);
116
117 return ret;
118}
119
120static int uniphier_regulator_remove(struct platform_device *pdev)
121{
122 struct uniphier_regulator_priv *priv = platform_get_drvdata(pdev);
123 int i;
124
125 for (i = 0; i < priv->data->nrsts; i++)
126 reset_control_assert(priv->rst[i]);
127
128 clk_bulk_disable_unprepare(priv->data->nclks, priv->clk);
129
130 return 0;
131}
132
133/* USB3 controller data */
134#define USB3VBUS_OFFSET 0x0
135#define USB3VBUS_REG BIT(4)
136#define USB3VBUS_REG_EN BIT(3)
137static const struct regulator_desc uniphier_usb3_regulator_desc = {
138 .name = "vbus",
139 .of_match = of_match_ptr("vbus"),
140 .ops = &uniphier_regulator_ops,
141 .type = REGULATOR_VOLTAGE,
142 .owner = THIS_MODULE,
143 .enable_reg = USB3VBUS_OFFSET,
144 .enable_mask = USB3VBUS_REG_EN | USB3VBUS_REG,
145 .enable_val = USB3VBUS_REG_EN | USB3VBUS_REG,
146 .disable_val = USB3VBUS_REG_EN,
147};
148
149static const struct regmap_config uniphier_usb3_regulator_regconf = {
150 .reg_bits = 32,
151 .val_bits = 32,
152 .reg_stride = 4,
153 .max_register = 1,
154};
155
156static const char * const uniphier_pro4_clock_reset_names[] = {
157 "gio", "link",
158};
159
160static const struct uniphier_regulator_soc_data uniphier_pro4_usb3_data = {
161 .nclks = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
162 .clock_names = uniphier_pro4_clock_reset_names,
163 .nrsts = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
164 .reset_names = uniphier_pro4_clock_reset_names,
165 .desc = &uniphier_usb3_regulator_desc,
166 .regconf = &uniphier_usb3_regulator_regconf,
167};
168
169static const char * const uniphier_pxs2_clock_reset_names[] = {
170 "link",
171};
172
173static const struct uniphier_regulator_soc_data uniphier_pxs2_usb3_data = {
174 .nclks = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
175 .clock_names = uniphier_pxs2_clock_reset_names,
176 .nrsts = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
177 .reset_names = uniphier_pxs2_clock_reset_names,
178 .desc = &uniphier_usb3_regulator_desc,
179 .regconf = &uniphier_usb3_regulator_regconf,
180};
181
182static const struct of_device_id uniphier_regulator_match[] = {
183 /* USB VBUS */
184 {
185 .compatible = "socionext,uniphier-pro4-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 { /* Sentinel */ },
201};
202
203static struct platform_driver uniphier_regulator_driver = {
204 .probe = uniphier_regulator_probe,
205 .remove = uniphier_regulator_remove,
206 .driver = {
207 .name = "uniphier-regulator",
208 .of_match_table = uniphier_regulator_match,
209 },
210};
211module_platform_driver(uniphier_regulator_driver);
212
213MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
214MODULE_DESCRIPTION("UniPhier Regulator Controller Driver");
215MODULE_LICENSE("GPL");
216