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 MODULE_DEVICE_TABLE(of, uniphier_regulator_match);
205 
206 static struct platform_driver uniphier_regulator_driver = {
207 	.probe = uniphier_regulator_probe,
208 	.remove = uniphier_regulator_remove,
209 	.driver = {
210 		.name  = "uniphier-regulator",
211 		.of_match_table = uniphier_regulator_match,
212 	},
213 };
214 module_platform_driver(uniphier_regulator_driver);
215 
216 MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
217 MODULE_DESCRIPTION("UniPhier Regulator Controller Driver");
218 MODULE_LICENSE("GPL");
219