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Linux/drivers/usb/dwc3/dwc3-exynos.c

  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                 dev_info(dev, "no suspend clk specified\n");
133                 exynos->susp_clk = NULL;
134         }
135         clk_prepare_enable(exynos->susp_clk);
136 
137         if (of_device_is_compatible(node, "samsung,exynos7-dwusb3")) {
138                 exynos->axius_clk = devm_clk_get(dev, "usbdrd30_axius_clk");
139                 if (IS_ERR(exynos->axius_clk)) {
140                         dev_err(dev, "no AXI UpScaler clk specified\n");
141                         ret = -ENODEV;
142                         goto axius_clk_err;
143                 }
144                 clk_prepare_enable(exynos->axius_clk);
145         } else {
146                 exynos->axius_clk = NULL;
147         }
148 
149         exynos->vdd33 = devm_regulator_get(dev, "vdd33");
150         if (IS_ERR(exynos->vdd33)) {
151                 ret = PTR_ERR(exynos->vdd33);
152                 goto err2;
153         }
154         ret = regulator_enable(exynos->vdd33);
155         if (ret) {
156                 dev_err(dev, "Failed to enable VDD33 supply\n");
157                 goto err2;
158         }
159 
160         exynos->vdd10 = devm_regulator_get(dev, "vdd10");
161         if (IS_ERR(exynos->vdd10)) {
162                 ret = PTR_ERR(exynos->vdd10);
163                 goto err3;
164         }
165         ret = regulator_enable(exynos->vdd10);
166         if (ret) {
167                 dev_err(dev, "Failed to enable VDD10 supply\n");
168                 goto err3;
169         }
170 
171         ret = dwc3_exynos_register_phys(exynos);
172         if (ret) {
173                 dev_err(dev, "couldn't register PHYs\n");
174                 goto err4;
175         }
176 
177         if (node) {
178                 ret = of_platform_populate(node, NULL, NULL, dev);
179                 if (ret) {
180                         dev_err(dev, "failed to add dwc3 core\n");
181                         goto err5;
182                 }
183         } else {
184                 dev_err(dev, "no device node, failed to add dwc3 core\n");
185                 ret = -ENODEV;
186                 goto err5;
187         }
188 
189         return 0;
190 
191 err5:
192         platform_device_unregister(exynos->usb2_phy);
193         platform_device_unregister(exynos->usb3_phy);
194 err4:
195         regulator_disable(exynos->vdd10);
196 err3:
197         regulator_disable(exynos->vdd33);
198 err2:
199         clk_disable_unprepare(exynos->axius_clk);
200 axius_clk_err:
201         clk_disable_unprepare(exynos->susp_clk);
202         clk_disable_unprepare(exynos->clk);
203         return ret;
204 }
205 
206 static int dwc3_exynos_remove(struct platform_device *pdev)
207 {
208         struct dwc3_exynos      *exynos = platform_get_drvdata(pdev);
209 
210         device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
211         platform_device_unregister(exynos->usb2_phy);
212         platform_device_unregister(exynos->usb3_phy);
213 
214         clk_disable_unprepare(exynos->axius_clk);
215         clk_disable_unprepare(exynos->susp_clk);
216         clk_disable_unprepare(exynos->clk);
217 
218         regulator_disable(exynos->vdd33);
219         regulator_disable(exynos->vdd10);
220 
221         return 0;
222 }
223 
224 static const struct of_device_id exynos_dwc3_match[] = {
225         { .compatible = "samsung,exynos5250-dwusb3" },
226         { .compatible = "samsung,exynos7-dwusb3" },
227         {},
228 };
229 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
230 
231 #ifdef CONFIG_PM_SLEEP
232 static int dwc3_exynos_suspend(struct device *dev)
233 {
234         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
235 
236         clk_disable(exynos->axius_clk);
237         clk_disable(exynos->clk);
238 
239         regulator_disable(exynos->vdd33);
240         regulator_disable(exynos->vdd10);
241 
242         return 0;
243 }
244 
245 static int dwc3_exynos_resume(struct device *dev)
246 {
247         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
248         int ret;
249 
250         ret = regulator_enable(exynos->vdd33);
251         if (ret) {
252                 dev_err(dev, "Failed to enable VDD33 supply\n");
253                 return ret;
254         }
255         ret = regulator_enable(exynos->vdd10);
256         if (ret) {
257                 dev_err(dev, "Failed to enable VDD10 supply\n");
258                 return ret;
259         }
260 
261         clk_enable(exynos->clk);
262         clk_enable(exynos->axius_clk);
263 
264         /* runtime set active to reflect active state. */
265         pm_runtime_disable(dev);
266         pm_runtime_set_active(dev);
267         pm_runtime_enable(dev);
268 
269         return 0;
270 }
271 
272 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
273         SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
274 };
275 
276 #define DEV_PM_OPS      (&dwc3_exynos_dev_pm_ops)
277 #else
278 #define DEV_PM_OPS      NULL
279 #endif /* CONFIG_PM_SLEEP */
280 
281 static struct platform_driver dwc3_exynos_driver = {
282         .probe          = dwc3_exynos_probe,
283         .remove         = dwc3_exynos_remove,
284         .driver         = {
285                 .name   = "exynos-dwc3",
286                 .of_match_table = exynos_dwc3_match,
287                 .pm     = DEV_PM_OPS,
288         },
289 };
290 
291 module_platform_driver(dwc3_exynos_driver);
292 
293 MODULE_ALIAS("platform:exynos-dwc3");
294 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
295 MODULE_LICENSE("GPL v2");
296 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");
297 

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