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
20 struct 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
29 struct 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
35 static 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
uniphier_regulator_probe(struct platform_device * pdev)41 static 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, 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, 0);
61 if (IS_ERR(base))
62 return PTR_ERR(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, priv->data->nclks, 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, name);
73 if (IS_ERR(priv->rst[i]))
74 return PTR_ERR(priv->rst[i]);
75 }
76
77 ret = clk_bulk_prepare_enable(priv->data->nclks, priv->clk);
78 if (ret)
79 return ret;
80
81 for (nr = 0; nr < priv->data->nrsts; nr++) {
82 ret = reset_control_deassert(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(regmap)) {
89 ret = PTR_ERR(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, dev->of_node,
98 priv->data->desc);
99 rdev = devm_regulator_register(dev, priv->data->desc, &config);
100 if (IS_ERR(rdev)) {
101 ret = PTR_ERR(rdev);
102 goto out_rst_assert;
103 }
104
105 platform_set_drvdata(pdev, priv);
106
107 return 0;
108
109 out_rst_assert:
110 while (nr--)
111 reset_control_assert(priv->rst[nr]);
112
113 clk_bulk_disable_unprepare(priv->data->nclks, priv->clk);
114
115 return ret;
116 }
117
uniphier_regulator_remove(struct platform_device * pdev)118 static int 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(priv->rst[i]);
125
126 clk_bulk_disable_unprepare(priv->data->nclks, priv->clk);
127
128 return 0;
129 }
130
131 /* USB3 controller data */
132 #define USB3VBUS_OFFSET 0x0
133 #define USB3VBUS_REG BIT(4)
134 #define USB3VBUS_REG_EN BIT(3)
135 static const struct regulator_desc uniphier_usb3_regulator_desc = {
136 .name = "vbus",
137 .of_match = of_match_ptr("vbus"),
138 .ops = &uniphier_regulator_ops,
139 .type = REGULATOR_VOLTAGE,
140 .owner = THIS_MODULE,
141 .enable_reg = USB3VBUS_OFFSET,
142 .enable_mask = USB3VBUS_REG_EN | USB3VBUS_REG,
143 .enable_val = USB3VBUS_REG_EN | USB3VBUS_REG,
144 .disable_val = USB3VBUS_REG_EN,
145 };
146
147 static const struct regmap_config uniphier_usb3_regulator_regconf = {
148 .reg_bits = 32,
149 .val_bits = 32,
150 .reg_stride = 4,
151 .max_register = 1,
152 };
153
154 static const char * const uniphier_pro4_clock_reset_names[] = {
155 "gio", "link",
156 };
157
158 static const struct uniphier_regulator_soc_data uniphier_pro4_usb3_data = {
159 .nclks = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
160 .clock_names = uniphier_pro4_clock_reset_names,
161 .nrsts = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
162 .reset_names = uniphier_pro4_clock_reset_names,
163 .desc = &uniphier_usb3_regulator_desc,
164 .regconf = &uniphier_usb3_regulator_regconf,
165 };
166
167 static const char * const uniphier_pxs2_clock_reset_names[] = {
168 "link",
169 };
170
171 static const struct uniphier_regulator_soc_data uniphier_pxs2_usb3_data = {
172 .nclks = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
173 .clock_names = uniphier_pxs2_clock_reset_names,
174 .nrsts = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
175 .reset_names = uniphier_pxs2_clock_reset_names,
176 .desc = &uniphier_usb3_regulator_desc,
177 .regconf = &uniphier_usb3_regulator_regconf,
178 };
179
180 static const struct of_device_id uniphier_regulator_match[] = {
181 /* USB VBUS */
182 {
183 .compatible = "socionext,uniphier-pro4-usb3-regulator",
184 .data = &uniphier_pro4_usb3_data,
185 },
186 {
187 .compatible = "socionext,uniphier-pro5-usb3-regulator",
188 .data = &uniphier_pro4_usb3_data,
189 },
190 {
191 .compatible = "socionext,uniphier-pxs2-usb3-regulator",
192 .data = &uniphier_pxs2_usb3_data,
193 },
194 {
195 .compatible = "socionext,uniphier-ld20-usb3-regulator",
196 .data = &uniphier_pxs2_usb3_data,
197 },
198 {
199 .compatible = "socionext,uniphier-pxs3-usb3-regulator",
200 .data = &uniphier_pxs2_usb3_data,
201 },
202 {
203 .compatible = "socionext,uniphier-nx1-usb3-regulator",
204 .data = &uniphier_pxs2_usb3_data,
205 },
206 { /* Sentinel */ },
207 };
208 MODULE_DEVICE_TABLE(of, uniphier_regulator_match);
209
210 static struct platform_driver uniphier_regulator_driver = {
211 .probe = uniphier_regulator_probe,
212 .remove = uniphier_regulator_remove,
213 .driver = {
214 .name = "uniphier-regulator",
215 .of_match_table = uniphier_regulator_match,
216 },
217 };
218 module_platform_driver(uniphier_regulator_driver);
219
220 MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
221 MODULE_DESCRIPTION("UniPhier Regulator Controller Driver");
222 MODULE_LICENSE("GPL");
223