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/usb/otg.h>
17 #include <linux/usb/usb_phy_generic.h>
18 #include <linux/of.h>
19 #include <linux/of_platform.h>
20 #include <linux/regulator/consumer.h>
21
22 struct dwc3_exynos {
23 struct platform_device *usb2_phy;
24 struct platform_device *usb3_phy;
25 struct device *dev;
26
27 struct clk *clk;
28 struct clk *susp_clk;
29 struct clk *axius_clk;
30
31 struct regulator *vdd33;
32 struct regulator *vdd10;
33 };
34
dwc3_exynos_register_phys(struct dwc3_exynos * exynos)35 static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
36 {
37 struct usb_phy_generic_platform_data pdata;
38 struct platform_device *pdev;
39 int ret;
40
41 memset(&pdata, 0x00, sizeof(pdata));
42
43 pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
44 if (!pdev)
45 return -ENOMEM;
46
47 exynos->usb2_phy = pdev;
48 pdata.type = USB_PHY_TYPE_USB2;
49 pdata.gpio_reset = -1;
50
51 ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
52 if (ret)
53 goto err1;
54
55 pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
56 if (!pdev) {
57 ret = -ENOMEM;
58 goto err1;
59 }
60
61 exynos->usb3_phy = pdev;
62 pdata.type = USB_PHY_TYPE_USB3;
63
64 ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
65 if (ret)
66 goto err2;
67
68 ret = platform_device_add(exynos->usb2_phy);
69 if (ret)
70 goto err2;
71
72 ret = platform_device_add(exynos->usb3_phy);
73 if (ret)
74 goto err3;
75
76 return 0;
77
78 err3:
79 platform_device_del(exynos->usb2_phy);
80
81 err2:
82 platform_device_put(exynos->usb3_phy);
83
84 err1:
85 platform_device_put(exynos->usb2_phy);
86
87 return ret;
88 }
89
dwc3_exynos_remove_child(struct device * dev,void * unused)90 static int dwc3_exynos_remove_child(struct device *dev, void *unused)
91 {
92 struct platform_device *pdev = to_platform_device(dev);
93
94 platform_device_unregister(pdev);
95
96 return 0;
97 }
98
dwc3_exynos_probe(struct platform_device * pdev)99 static int dwc3_exynos_probe(struct platform_device *pdev)
100 {
101 struct dwc3_exynos *exynos;
102 struct device *dev = &pdev->dev;
103 struct device_node *node = dev->of_node;
104
105 int ret;
106
107 exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
108 if (!exynos)
109 return -ENOMEM;
110
111 platform_set_drvdata(pdev, exynos);
112
113 exynos->dev = dev;
114
115 exynos->clk = devm_clk_get(dev, "usbdrd30");
116 if (IS_ERR(exynos->clk)) {
117 dev_err(dev, "couldn't get clock\n");
118 return -EINVAL;
119 }
120 ret = clk_prepare_enable(exynos->clk);
121 if (ret)
122 return ret;
123
124 exynos->susp_clk = devm_clk_get(dev, "usbdrd30_susp_clk");
125 if (IS_ERR(exynos->susp_clk))
126 exynos->susp_clk = NULL;
127 ret = clk_prepare_enable(exynos->susp_clk);
128 if (ret)
129 goto susp_clk_err;
130
131 if (of_device_is_compatible(node, "samsung,exynos7-dwusb3")) {
132 exynos->axius_clk = devm_clk_get(dev, "usbdrd30_axius_clk");
133 if (IS_ERR(exynos->axius_clk)) {
134 dev_err(dev, "no AXI UpScaler clk specified\n");
135 ret = -ENODEV;
136 goto axius_clk_err;
137 }
138 ret = clk_prepare_enable(exynos->axius_clk);
139 if (ret)
140 goto axius_clk_err;
141 } else {
142 exynos->axius_clk = NULL;
143 }
144
145 exynos->vdd33 = devm_regulator_get(dev, "vdd33");
146 if (IS_ERR(exynos->vdd33)) {
147 ret = PTR_ERR(exynos->vdd33);
148 goto vdd33_err;
149 }
150 ret = regulator_enable(exynos->vdd33);
151 if (ret) {
152 dev_err(dev, "Failed to enable VDD33 supply\n");
153 goto vdd33_err;
154 }
155
156 exynos->vdd10 = devm_regulator_get(dev, "vdd10");
157 if (IS_ERR(exynos->vdd10)) {
158 ret = PTR_ERR(exynos->vdd10);
159 goto vdd10_err;
160 }
161 ret = regulator_enable(exynos->vdd10);
162 if (ret) {
163 dev_err(dev, "Failed to enable VDD10 supply\n");
164 goto vdd10_err;
165 }
166
167 ret = dwc3_exynos_register_phys(exynos);
168 if (ret) {
169 dev_err(dev, "couldn't register PHYs\n");
170 goto phys_err;
171 }
172
173 if (node) {
174 ret = of_platform_populate(node, NULL, NULL, dev);
175 if (ret) {
176 dev_err(dev, "failed to add dwc3 core\n");
177 goto populate_err;
178 }
179 } else {
180 dev_err(dev, "no device node, failed to add dwc3 core\n");
181 ret = -ENODEV;
182 goto populate_err;
183 }
184
185 return 0;
186
187 populate_err:
188 platform_device_unregister(exynos->usb2_phy);
189 platform_device_unregister(exynos->usb3_phy);
190 phys_err:
191 regulator_disable(exynos->vdd10);
192 vdd10_err:
193 regulator_disable(exynos->vdd33);
194 vdd33_err:
195 clk_disable_unprepare(exynos->axius_clk);
196 axius_clk_err:
197 clk_disable_unprepare(exynos->susp_clk);
198 susp_clk_err:
199 clk_disable_unprepare(exynos->clk);
200 return ret;
201 }
202
dwc3_exynos_remove(struct platform_device * pdev)203 static int dwc3_exynos_remove(struct platform_device *pdev)
204 {
205 struct dwc3_exynos *exynos = platform_get_drvdata(pdev);
206
207 device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
208 platform_device_unregister(exynos->usb2_phy);
209 platform_device_unregister(exynos->usb3_phy);
210
211 clk_disable_unprepare(exynos->axius_clk);
212 clk_disable_unprepare(exynos->susp_clk);
213 clk_disable_unprepare(exynos->clk);
214
215 regulator_disable(exynos->vdd33);
216 regulator_disable(exynos->vdd10);
217
218 return 0;
219 }
220
221 static const struct of_device_id exynos_dwc3_match[] = {
222 { .compatible = "samsung,exynos5250-dwusb3" },
223 { .compatible = "samsung,exynos7-dwusb3" },
224 {},
225 };
226 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
227
228 #ifdef CONFIG_PM_SLEEP
dwc3_exynos_suspend(struct device * dev)229 static int dwc3_exynos_suspend(struct device *dev)
230 {
231 struct dwc3_exynos *exynos = dev_get_drvdata(dev);
232
233 clk_disable(exynos->axius_clk);
234 clk_disable(exynos->clk);
235
236 regulator_disable(exynos->vdd33);
237 regulator_disable(exynos->vdd10);
238
239 return 0;
240 }
241
dwc3_exynos_resume(struct device * dev)242 static int dwc3_exynos_resume(struct device *dev)
243 {
244 struct dwc3_exynos *exynos = dev_get_drvdata(dev);
245 int ret;
246
247 ret = regulator_enable(exynos->vdd33);
248 if (ret) {
249 dev_err(dev, "Failed to enable VDD33 supply\n");
250 return ret;
251 }
252 ret = regulator_enable(exynos->vdd10);
253 if (ret) {
254 dev_err(dev, "Failed to enable VDD10 supply\n");
255 return ret;
256 }
257
258 clk_enable(exynos->clk);
259 clk_enable(exynos->axius_clk);
260
261 /* runtime set active to reflect active state. */
262 pm_runtime_disable(dev);
263 pm_runtime_set_active(dev);
264 pm_runtime_enable(dev);
265
266 return 0;
267 }
268
269 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
270 SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
271 };
272
273 #define DEV_PM_OPS (&dwc3_exynos_dev_pm_ops)
274 #else
275 #define DEV_PM_OPS NULL
276 #endif /* CONFIG_PM_SLEEP */
277
278 static struct platform_driver dwc3_exynos_driver = {
279 .probe = dwc3_exynos_probe,
280 .remove = dwc3_exynos_remove,
281 .driver = {
282 .name = "exynos-dwc3",
283 .of_match_table = exynos_dwc3_match,
284 .pm = DEV_PM_OPS,
285 },
286 };
287
288 module_platform_driver(dwc3_exynos_driver);
289
290 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
291 MODULE_LICENSE("GPL v2");
292 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");
293
