xref: /openbmc/linux/drivers/usb/dwc3/dwc3-exynos.c (revision a36954f5)
1 /**
2  * dwc3-exynos.c - Samsung EXYNOS DWC3 Specific Glue layer
3  *
4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5  *		http://www.samsung.com
6  *
7  * Author: Anton Tikhomirov <av.tikhomirov@samsung.com>
8  *
9  * This program is free software: you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2  of
11  * the License as published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  */
18 
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/slab.h>
22 #include <linux/platform_device.h>
23 #include <linux/clk.h>
24 #include <linux/usb/otg.h>
25 #include <linux/usb/usb_phy_generic.h>
26 #include <linux/of.h>
27 #include <linux/of_platform.h>
28 #include <linux/regulator/consumer.h>
29 
30 struct dwc3_exynos {
31 	struct platform_device	*usb2_phy;
32 	struct platform_device	*usb3_phy;
33 	struct device		*dev;
34 
35 	struct clk		*clk;
36 	struct clk		*susp_clk;
37 	struct clk		*axius_clk;
38 
39 	struct regulator	*vdd33;
40 	struct regulator	*vdd10;
41 };
42 
43 static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
44 {
45 	struct usb_phy_generic_platform_data pdata;
46 	struct platform_device	*pdev;
47 	int			ret;
48 
49 	memset(&pdata, 0x00, sizeof(pdata));
50 
51 	pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
52 	if (!pdev)
53 		return -ENOMEM;
54 
55 	exynos->usb2_phy = pdev;
56 	pdata.type = USB_PHY_TYPE_USB2;
57 	pdata.gpio_reset = -1;
58 
59 	ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
60 	if (ret)
61 		goto err1;
62 
63 	pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
64 	if (!pdev) {
65 		ret = -ENOMEM;
66 		goto err1;
67 	}
68 
69 	exynos->usb3_phy = pdev;
70 	pdata.type = USB_PHY_TYPE_USB3;
71 
72 	ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
73 	if (ret)
74 		goto err2;
75 
76 	ret = platform_device_add(exynos->usb2_phy);
77 	if (ret)
78 		goto err2;
79 
80 	ret = platform_device_add(exynos->usb3_phy);
81 	if (ret)
82 		goto err3;
83 
84 	return 0;
85 
86 err3:
87 	platform_device_del(exynos->usb2_phy);
88 
89 err2:
90 	platform_device_put(exynos->usb3_phy);
91 
92 err1:
93 	platform_device_put(exynos->usb2_phy);
94 
95 	return ret;
96 }
97 
98 static int dwc3_exynos_remove_child(struct device *dev, void *unused)
99 {
100 	struct platform_device *pdev = to_platform_device(dev);
101 
102 	platform_device_unregister(pdev);
103 
104 	return 0;
105 }
106 
107 static int dwc3_exynos_probe(struct platform_device *pdev)
108 {
109 	struct dwc3_exynos	*exynos;
110 	struct device		*dev = &pdev->dev;
111 	struct device_node	*node = dev->of_node;
112 
113 	int			ret;
114 
115 	exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
116 	if (!exynos)
117 		return -ENOMEM;
118 
119 	platform_set_drvdata(pdev, exynos);
120 
121 	exynos->dev	= dev;
122 
123 	exynos->clk = devm_clk_get(dev, "usbdrd30");
124 	if (IS_ERR(exynos->clk)) {
125 		dev_err(dev, "couldn't get clock\n");
126 		return -EINVAL;
127 	}
128 	clk_prepare_enable(exynos->clk);
129 
130 	exynos->susp_clk = devm_clk_get(dev, "usbdrd30_susp_clk");
131 	if (IS_ERR(exynos->susp_clk))
132 		exynos->susp_clk = NULL;
133 	clk_prepare_enable(exynos->susp_clk);
134 
135 	if (of_device_is_compatible(node, "samsung,exynos7-dwusb3")) {
136 		exynos->axius_clk = devm_clk_get(dev, "usbdrd30_axius_clk");
137 		if (IS_ERR(exynos->axius_clk)) {
138 			dev_err(dev, "no AXI UpScaler clk specified\n");
139 			ret = -ENODEV;
140 			goto axius_clk_err;
141 		}
142 		clk_prepare_enable(exynos->axius_clk);
143 	} else {
144 		exynos->axius_clk = NULL;
145 	}
146 
147 	exynos->vdd33 = devm_regulator_get(dev, "vdd33");
148 	if (IS_ERR(exynos->vdd33)) {
149 		ret = PTR_ERR(exynos->vdd33);
150 		goto vdd33_err;
151 	}
152 	ret = regulator_enable(exynos->vdd33);
153 	if (ret) {
154 		dev_err(dev, "Failed to enable VDD33 supply\n");
155 		goto vdd33_err;
156 	}
157 
158 	exynos->vdd10 = devm_regulator_get(dev, "vdd10");
159 	if (IS_ERR(exynos->vdd10)) {
160 		ret = PTR_ERR(exynos->vdd10);
161 		goto vdd10_err;
162 	}
163 	ret = regulator_enable(exynos->vdd10);
164 	if (ret) {
165 		dev_err(dev, "Failed to enable VDD10 supply\n");
166 		goto vdd10_err;
167 	}
168 
169 	ret = dwc3_exynos_register_phys(exynos);
170 	if (ret) {
171 		dev_err(dev, "couldn't register PHYs\n");
172 		goto phys_err;
173 	}
174 
175 	if (node) {
176 		ret = of_platform_populate(node, NULL, NULL, dev);
177 		if (ret) {
178 			dev_err(dev, "failed to add dwc3 core\n");
179 			goto populate_err;
180 		}
181 	} else {
182 		dev_err(dev, "no device node, failed to add dwc3 core\n");
183 		ret = -ENODEV;
184 		goto populate_err;
185 	}
186 
187 	return 0;
188 
189 populate_err:
190 	platform_device_unregister(exynos->usb2_phy);
191 	platform_device_unregister(exynos->usb3_phy);
192 phys_err:
193 	regulator_disable(exynos->vdd10);
194 vdd10_err:
195 	regulator_disable(exynos->vdd33);
196 vdd33_err:
197 	clk_disable_unprepare(exynos->axius_clk);
198 axius_clk_err:
199 	clk_disable_unprepare(exynos->susp_clk);
200 	clk_disable_unprepare(exynos->clk);
201 	return ret;
202 }
203 
204 static int dwc3_exynos_remove(struct platform_device *pdev)
205 {
206 	struct dwc3_exynos	*exynos = platform_get_drvdata(pdev);
207 
208 	device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
209 	platform_device_unregister(exynos->usb2_phy);
210 	platform_device_unregister(exynos->usb3_phy);
211 
212 	clk_disable_unprepare(exynos->axius_clk);
213 	clk_disable_unprepare(exynos->susp_clk);
214 	clk_disable_unprepare(exynos->clk);
215 
216 	regulator_disable(exynos->vdd33);
217 	regulator_disable(exynos->vdd10);
218 
219 	return 0;
220 }
221 
222 static const struct of_device_id exynos_dwc3_match[] = {
223 	{ .compatible = "samsung,exynos5250-dwusb3" },
224 	{ .compatible = "samsung,exynos7-dwusb3" },
225 	{},
226 };
227 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
228 
229 #ifdef CONFIG_PM_SLEEP
230 static int dwc3_exynos_suspend(struct device *dev)
231 {
232 	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
233 
234 	clk_disable(exynos->axius_clk);
235 	clk_disable(exynos->clk);
236 
237 	regulator_disable(exynos->vdd33);
238 	regulator_disable(exynos->vdd10);
239 
240 	return 0;
241 }
242 
243 static int dwc3_exynos_resume(struct device *dev)
244 {
245 	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
246 	int ret;
247 
248 	ret = regulator_enable(exynos->vdd33);
249 	if (ret) {
250 		dev_err(dev, "Failed to enable VDD33 supply\n");
251 		return ret;
252 	}
253 	ret = regulator_enable(exynos->vdd10);
254 	if (ret) {
255 		dev_err(dev, "Failed to enable VDD10 supply\n");
256 		return ret;
257 	}
258 
259 	clk_enable(exynos->clk);
260 	clk_enable(exynos->axius_clk);
261 
262 	/* runtime set active to reflect active state. */
263 	pm_runtime_disable(dev);
264 	pm_runtime_set_active(dev);
265 	pm_runtime_enable(dev);
266 
267 	return 0;
268 }
269 
270 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
271 	SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
272 };
273 
274 #define DEV_PM_OPS	(&dwc3_exynos_dev_pm_ops)
275 #else
276 #define DEV_PM_OPS	NULL
277 #endif /* CONFIG_PM_SLEEP */
278 
279 static struct platform_driver dwc3_exynos_driver = {
280 	.probe		= dwc3_exynos_probe,
281 	.remove		= dwc3_exynos_remove,
282 	.driver		= {
283 		.name	= "exynos-dwc3",
284 		.of_match_table = exynos_dwc3_match,
285 		.pm	= DEV_PM_OPS,
286 	},
287 };
288 
289 module_platform_driver(dwc3_exynos_driver);
290 
291 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
292 MODULE_LICENSE("GPL v2");
293 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");
294