xref: /openbmc/linux/drivers/usb/dwc3/dwc3-exynos.c (revision 592d7a46)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * dwc3-exynos.c - Samsung Exynos DWC3 Specific Glue layer
4  *
5  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
6  *		http://www.samsung.com
7  *
8  * Author: Anton Tikhomirov <av.tikhomirov@samsung.com>
9  */
10 
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/platform_device.h>
15 #include <linux/clk.h>
16 #include <linux/of.h>
17 #include <linux/of_platform.h>
18 #include <linux/regulator/consumer.h>
19 
20 #define DWC3_EXYNOS_MAX_CLOCKS	4
21 
22 struct dwc3_exynos_driverdata {
23 	const char		*clk_names[DWC3_EXYNOS_MAX_CLOCKS];
24 	int			num_clks;
25 	int			suspend_clk_idx;
26 };
27 
28 struct dwc3_exynos {
29 	struct device		*dev;
30 
31 	const char		**clk_names;
32 	struct clk		*clks[DWC3_EXYNOS_MAX_CLOCKS];
33 	int			num_clks;
34 	int			suspend_clk_idx;
35 
36 	struct regulator	*vdd33;
37 	struct regulator	*vdd10;
38 };
39 
dwc3_exynos_probe(struct platform_device * pdev)40 static int dwc3_exynos_probe(struct platform_device *pdev)
41 {
42 	struct dwc3_exynos	*exynos;
43 	struct device		*dev = &pdev->dev;
44 	struct device_node	*node = dev->of_node;
45 	const struct dwc3_exynos_driverdata *driver_data;
46 	int			i, ret;
47 
48 	exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
49 	if (!exynos)
50 		return -ENOMEM;
51 
52 	driver_data = of_device_get_match_data(dev);
53 	exynos->dev = dev;
54 	exynos->num_clks = driver_data->num_clks;
55 	exynos->clk_names = (const char **)driver_data->clk_names;
56 	exynos->suspend_clk_idx = driver_data->suspend_clk_idx;
57 
58 	platform_set_drvdata(pdev, exynos);
59 
60 	for (i = 0; i < exynos->num_clks; i++) {
61 		exynos->clks[i] = devm_clk_get(dev, exynos->clk_names[i]);
62 		if (IS_ERR(exynos->clks[i])) {
63 			dev_err(dev, "failed to get clock: %s\n",
64 				exynos->clk_names[i]);
65 			return PTR_ERR(exynos->clks[i]);
66 		}
67 	}
68 
69 	for (i = 0; i < exynos->num_clks; i++) {
70 		ret = clk_prepare_enable(exynos->clks[i]);
71 		if (ret) {
72 			while (i-- > 0)
73 				clk_disable_unprepare(exynos->clks[i]);
74 			return ret;
75 		}
76 	}
77 
78 	if (exynos->suspend_clk_idx >= 0)
79 		clk_prepare_enable(exynos->clks[exynos->suspend_clk_idx]);
80 
81 	exynos->vdd33 = devm_regulator_get(dev, "vdd33");
82 	if (IS_ERR(exynos->vdd33)) {
83 		ret = PTR_ERR(exynos->vdd33);
84 		goto vdd33_err;
85 	}
86 	ret = regulator_enable(exynos->vdd33);
87 	if (ret) {
88 		dev_err(dev, "Failed to enable VDD33 supply\n");
89 		goto vdd33_err;
90 	}
91 
92 	exynos->vdd10 = devm_regulator_get(dev, "vdd10");
93 	if (IS_ERR(exynos->vdd10)) {
94 		ret = PTR_ERR(exynos->vdd10);
95 		goto vdd10_err;
96 	}
97 	ret = regulator_enable(exynos->vdd10);
98 	if (ret) {
99 		dev_err(dev, "Failed to enable VDD10 supply\n");
100 		goto vdd10_err;
101 	}
102 
103 	if (node) {
104 		ret = of_platform_populate(node, NULL, NULL, dev);
105 		if (ret) {
106 			dev_err(dev, "failed to add dwc3 core\n");
107 			goto populate_err;
108 		}
109 	} else {
110 		dev_err(dev, "no device node, failed to add dwc3 core\n");
111 		ret = -ENODEV;
112 		goto populate_err;
113 	}
114 
115 	return 0;
116 
117 populate_err:
118 	regulator_disable(exynos->vdd10);
119 vdd10_err:
120 	regulator_disable(exynos->vdd33);
121 vdd33_err:
122 	for (i = exynos->num_clks - 1; i >= 0; i--)
123 		clk_disable_unprepare(exynos->clks[i]);
124 
125 	if (exynos->suspend_clk_idx >= 0)
126 		clk_disable_unprepare(exynos->clks[exynos->suspend_clk_idx]);
127 
128 	return ret;
129 }
130 
dwc3_exynos_remove(struct platform_device * pdev)131 static void dwc3_exynos_remove(struct platform_device *pdev)
132 {
133 	struct dwc3_exynos	*exynos = platform_get_drvdata(pdev);
134 	int i;
135 
136 	of_platform_depopulate(&pdev->dev);
137 
138 	for (i = exynos->num_clks - 1; i >= 0; i--)
139 		clk_disable_unprepare(exynos->clks[i]);
140 
141 	if (exynos->suspend_clk_idx >= 0)
142 		clk_disable_unprepare(exynos->clks[exynos->suspend_clk_idx]);
143 
144 	regulator_disable(exynos->vdd33);
145 	regulator_disable(exynos->vdd10);
146 }
147 
148 static const struct dwc3_exynos_driverdata exynos5250_drvdata = {
149 	.clk_names = { "usbdrd30" },
150 	.num_clks = 1,
151 	.suspend_clk_idx = -1,
152 };
153 
154 static const struct dwc3_exynos_driverdata exynos5433_drvdata = {
155 	.clk_names = { "aclk", "susp_clk", "pipe_pclk", "phyclk" },
156 	.num_clks = 4,
157 	.suspend_clk_idx = 1,
158 };
159 
160 static const struct dwc3_exynos_driverdata exynos7_drvdata = {
161 	.clk_names = { "usbdrd30", "usbdrd30_susp_clk", "usbdrd30_axius_clk" },
162 	.num_clks = 3,
163 	.suspend_clk_idx = 1,
164 };
165 
166 static const struct dwc3_exynos_driverdata exynos850_drvdata = {
167 	.clk_names = { "bus_early", "ref" },
168 	.num_clks = 2,
169 	.suspend_clk_idx = -1,
170 };
171 
172 static const struct of_device_id exynos_dwc3_match[] = {
173 	{
174 		.compatible = "samsung,exynos5250-dwusb3",
175 		.data = &exynos5250_drvdata,
176 	}, {
177 		.compatible = "samsung,exynos5433-dwusb3",
178 		.data = &exynos5433_drvdata,
179 	}, {
180 		.compatible = "samsung,exynos7-dwusb3",
181 		.data = &exynos7_drvdata,
182 	}, {
183 		.compatible = "samsung,exynos850-dwusb3",
184 		.data = &exynos850_drvdata,
185 	}, {
186 	}
187 };
188 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
189 
190 #ifdef CONFIG_PM_SLEEP
dwc3_exynos_suspend(struct device * dev)191 static int dwc3_exynos_suspend(struct device *dev)
192 {
193 	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
194 	int i;
195 
196 	for (i = exynos->num_clks - 1; i >= 0; i--)
197 		clk_disable_unprepare(exynos->clks[i]);
198 
199 	regulator_disable(exynos->vdd33);
200 	regulator_disable(exynos->vdd10);
201 
202 	return 0;
203 }
204 
dwc3_exynos_resume(struct device * dev)205 static int dwc3_exynos_resume(struct device *dev)
206 {
207 	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
208 	int i, ret;
209 
210 	ret = regulator_enable(exynos->vdd33);
211 	if (ret) {
212 		dev_err(dev, "Failed to enable VDD33 supply\n");
213 		return ret;
214 	}
215 	ret = regulator_enable(exynos->vdd10);
216 	if (ret) {
217 		dev_err(dev, "Failed to enable VDD10 supply\n");
218 		return ret;
219 	}
220 
221 	for (i = 0; i < exynos->num_clks; i++) {
222 		ret = clk_prepare_enable(exynos->clks[i]);
223 		if (ret) {
224 			while (i-- > 0)
225 				clk_disable_unprepare(exynos->clks[i]);
226 			return ret;
227 		}
228 	}
229 
230 	return 0;
231 }
232 
233 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
234 	SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
235 };
236 
237 #define DEV_PM_OPS	(&dwc3_exynos_dev_pm_ops)
238 #else
239 #define DEV_PM_OPS	NULL
240 #endif /* CONFIG_PM_SLEEP */
241 
242 static struct platform_driver dwc3_exynos_driver = {
243 	.probe		= dwc3_exynos_probe,
244 	.remove_new	= dwc3_exynos_remove,
245 	.driver		= {
246 		.name	= "exynos-dwc3",
247 		.of_match_table = exynos_dwc3_match,
248 		.pm	= DEV_PM_OPS,
249 	},
250 };
251 
252 module_platform_driver(dwc3_exynos_driver);
253 
254 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
255 MODULE_LICENSE("GPL v2");
256 MODULE_DESCRIPTION("DesignWare USB3 Exynos Glue Layer");
257