Merge tag 'for-linus-5.10b-rc1b-tag' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-microblaze.git] / drivers / regulator / uniphier-regulator.c
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
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
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         { /* Sentinel */ },
203 };
204
205 static struct platform_driver uniphier_regulator_driver = {
206         .probe = uniphier_regulator_probe,
207         .remove = uniphier_regulator_remove,
208         .driver = {
209                 .name  = "uniphier-regulator",
210                 .of_match_table = uniphier_regulator_match,
211         },
212 };
213 module_platform_driver(uniphier_regulator_driver);
214
215 MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
216 MODULE_DESCRIPTION("UniPhier Regulator Controller Driver");
217 MODULE_LICENSE("GPL");