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 dwc3_exynos_driverdata gs101_drvdata = {
173 .clk_names = { "bus_early", "susp_clk", "link_aclk", "link_pclk" },
174 .num_clks = 4,
175 .suspend_clk_idx = 1,
176 };
177
178 static const struct of_device_id exynos_dwc3_match[] = {
179 {
180 .compatible = "samsung,exynos5250-dwusb3",
181 .data = &exynos5250_drvdata,
182 }, {
183 .compatible = "samsung,exynos5433-dwusb3",
184 .data = &exynos5433_drvdata,
185 }, {
186 .compatible = "samsung,exynos7-dwusb3",
187 .data = &exynos7_drvdata,
188 }, {
189 .compatible = "samsung,exynos850-dwusb3",
190 .data = &exynos850_drvdata,
191 }, {
192 .compatible = "google,gs101-dwusb3",
193 .data = &gs101_drvdata,
194 }, {
195 }
196 };
197 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
198
dwc3_exynos_suspend(struct device * dev)199 static int dwc3_exynos_suspend(struct device *dev)
200 {
201 struct dwc3_exynos *exynos = dev_get_drvdata(dev);
202 int i;
203
204 for (i = exynos->num_clks - 1; i >= 0; i--)
205 clk_disable_unprepare(exynos->clks[i]);
206
207 regulator_disable(exynos->vdd33);
208 regulator_disable(exynos->vdd10);
209
210 return 0;
211 }
212
dwc3_exynos_resume(struct device * dev)213 static int dwc3_exynos_resume(struct device *dev)
214 {
215 struct dwc3_exynos *exynos = dev_get_drvdata(dev);
216 int i, ret;
217
218 ret = regulator_enable(exynos->vdd33);
219 if (ret) {
220 dev_err(dev, "Failed to enable VDD33 supply\n");
221 return ret;
222 }
223 ret = regulator_enable(exynos->vdd10);
224 if (ret) {
225 dev_err(dev, "Failed to enable VDD10 supply\n");
226 return ret;
227 }
228
229 for (i = 0; i < exynos->num_clks; i++) {
230 ret = clk_prepare_enable(exynos->clks[i]);
231 if (ret) {
232 while (i-- > 0)
233 clk_disable_unprepare(exynos->clks[i]);
234 return ret;
235 }
236 }
237
238 return 0;
239 }
240
241 static DEFINE_SIMPLE_DEV_PM_OPS(dwc3_exynos_dev_pm_ops,
242 dwc3_exynos_suspend, dwc3_exynos_resume);
243
244 static struct platform_driver dwc3_exynos_driver = {
245 .probe = dwc3_exynos_probe,
246 .remove_new = dwc3_exynos_remove,
247 .driver = {
248 .name = "exynos-dwc3",
249 .of_match_table = exynos_dwc3_match,
250 .pm = pm_sleep_ptr(&dwc3_exynos_dev_pm_ops),
251 },
252 };
253
254 module_platform_driver(dwc3_exynos_driver);
255
256 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
257 MODULE_LICENSE("GPL v2");
258 MODULE_DESCRIPTION("DesignWare USB3 Exynos Glue Layer");
259