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 exynos2200_drvdata = {
149 .clk_names = { "link_aclk" },
150 .num_clks = 1,
151 .suspend_clk_idx = -1,
152 };
153
154 static const struct dwc3_exynos_driverdata exynos5250_drvdata = {
155 .clk_names = { "usbdrd30" },
156 .num_clks = 1,
157 .suspend_clk_idx = -1,
158 };
159
160 static const struct dwc3_exynos_driverdata exynos5433_drvdata = {
161 .clk_names = { "aclk", "susp_clk", "pipe_pclk", "phyclk" },
162 .num_clks = 4,
163 .suspend_clk_idx = 1,
164 };
165
166 static const struct dwc3_exynos_driverdata exynos7_drvdata = {
167 .clk_names = { "usbdrd30", "usbdrd30_susp_clk", "usbdrd30_axius_clk" },
168 .num_clks = 3,
169 .suspend_clk_idx = 1,
170 };
171
172 static const struct dwc3_exynos_driverdata exynos7870_drvdata = {
173 .clk_names = { "bus_early", "ref", "ctrl" },
174 .num_clks = 3,
175 .suspend_clk_idx = -1,
176 };
177
178 static const struct dwc3_exynos_driverdata exynos850_drvdata = {
179 .clk_names = { "bus_early", "ref" },
180 .num_clks = 2,
181 .suspend_clk_idx = -1,
182 };
183
184 static const struct dwc3_exynos_driverdata gs101_drvdata = {
185 .clk_names = { "bus_early", "susp_clk", "link_aclk", "link_pclk" },
186 .num_clks = 4,
187 .suspend_clk_idx = 1,
188 };
189
190 static const struct dwc3_exynos_driverdata exynosautov920_drvdata = {
191 .clk_names = { "ref", "susp_clk"},
192 .num_clks = 2,
193 .suspend_clk_idx = 1,
194 };
195
196 static const struct of_device_id exynos_dwc3_match[] = {
197 {
198 .compatible = "samsung,exynos2200-dwusb3",
199 .data = &exynos2200_drvdata,
200 }, {
201 .compatible = "samsung,exynos5250-dwusb3",
202 .data = &exynos5250_drvdata,
203 }, {
204 .compatible = "samsung,exynos5433-dwusb3",
205 .data = &exynos5433_drvdata,
206 }, {
207 .compatible = "samsung,exynos7-dwusb3",
208 .data = &exynos7_drvdata,
209 }, {
210 .compatible = "samsung,exynos7870-dwusb3",
211 .data = &exynos7870_drvdata,
212 }, {
213 .compatible = "samsung,exynos850-dwusb3",
214 .data = &exynos850_drvdata,
215 }, {
216 .compatible = "samsung,exynosautov920-dwusb3",
217 .data = &exynosautov920_drvdata,
218 }, {
219 .compatible = "google,gs101-dwusb3",
220 .data = &gs101_drvdata,
221 }, {
222 }
223 };
224 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
225
dwc3_exynos_suspend(struct device * dev)226 static int dwc3_exynos_suspend(struct device *dev)
227 {
228 struct dwc3_exynos *exynos = dev_get_drvdata(dev);
229 int i;
230
231 for (i = exynos->num_clks - 1; i >= 0; i--)
232 clk_disable_unprepare(exynos->clks[i]);
233
234 regulator_disable(exynos->vdd33);
235 regulator_disable(exynos->vdd10);
236
237 return 0;
238 }
239
dwc3_exynos_resume(struct device * dev)240 static int dwc3_exynos_resume(struct device *dev)
241 {
242 struct dwc3_exynos *exynos = dev_get_drvdata(dev);
243 int i, ret;
244
245 ret = regulator_enable(exynos->vdd33);
246 if (ret) {
247 dev_err(dev, "Failed to enable VDD33 supply\n");
248 return ret;
249 }
250 ret = regulator_enable(exynos->vdd10);
251 if (ret) {
252 dev_err(dev, "Failed to enable VDD10 supply\n");
253 return ret;
254 }
255
256 for (i = 0; i < exynos->num_clks; i++) {
257 ret = clk_prepare_enable(exynos->clks[i]);
258 if (ret) {
259 while (i-- > 0)
260 clk_disable_unprepare(exynos->clks[i]);
261 return ret;
262 }
263 }
264
265 return 0;
266 }
267
268 static DEFINE_SIMPLE_DEV_PM_OPS(dwc3_exynos_dev_pm_ops,
269 dwc3_exynos_suspend, dwc3_exynos_resume);
270
271 static struct platform_driver dwc3_exynos_driver = {
272 .probe = dwc3_exynos_probe,
273 .remove = dwc3_exynos_remove,
274 .driver = {
275 .name = "exynos-dwc3",
276 .of_match_table = exynos_dwc3_match,
277 .pm = pm_sleep_ptr(&dwc3_exynos_dev_pm_ops),
278 },
279 };
280
281 module_platform_driver(dwc3_exynos_driver);
282
283 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
284 MODULE_LICENSE("GPL v2");
285 MODULE_DESCRIPTION("DesignWare USB3 Exynos Glue Layer");
286