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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/platform_data/dwc3-exynos.h>
 24 #include <linux/dma-mapping.h>
 25 #include <linux/clk.h>
 26 #include <linux/usb/otg.h>
 27 #include <linux/usb/usb_phy_generic.h>
 28 #include <linux/of.h>
 29 #include <linux/of_platform.h>
 30 #include <linux/regulator/consumer.h>
 31 
 32 struct dwc3_exynos {
 33         struct platform_device  *usb2_phy;
 34         struct platform_device  *usb3_phy;
 35         struct device           *dev;
 36 
 37         struct clk              *clk;
 38         struct regulator        *vdd33;
 39         struct regulator        *vdd10;
 40 };
 41 
 42 static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
 43 {
 44         struct usb_phy_generic_platform_data pdata;
 45         struct platform_device  *pdev;
 46         int                     ret;
 47 
 48         memset(&pdata, 0x00, sizeof(pdata));
 49 
 50         pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
 51         if (!pdev)
 52                 return -ENOMEM;
 53 
 54         exynos->usb2_phy = pdev;
 55         pdata.type = USB_PHY_TYPE_USB2;
 56         pdata.gpio_reset = -1;
 57 
 58         ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
 59         if (ret)
 60                 goto err1;
 61 
 62         pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
 63         if (!pdev) {
 64                 ret = -ENOMEM;
 65                 goto err1;
 66         }
 67 
 68         exynos->usb3_phy = pdev;
 69         pdata.type = USB_PHY_TYPE_USB3;
 70 
 71         ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
 72         if (ret)
 73                 goto err2;
 74 
 75         ret = platform_device_add(exynos->usb2_phy);
 76         if (ret)
 77                 goto err2;
 78 
 79         ret = platform_device_add(exynos->usb3_phy);
 80         if (ret)
 81                 goto err3;
 82 
 83         return 0;
 84 
 85 err3:
 86         platform_device_del(exynos->usb2_phy);
 87 
 88 err2:
 89         platform_device_put(exynos->usb3_phy);
 90 
 91 err1:
 92         platform_device_put(exynos->usb2_phy);
 93 
 94         return ret;
 95 }
 96 
 97 static int dwc3_exynos_remove_child(struct device *dev, void *unused)
 98 {
 99         struct platform_device *pdev = to_platform_device(dev);
100 
101         platform_device_unregister(pdev);
102 
103         return 0;
104 }
105 
106 static int dwc3_exynos_probe(struct platform_device *pdev)
107 {
108         struct dwc3_exynos      *exynos;
109         struct clk              *clk;
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         /*
120          * Right now device-tree probed devices don't get dma_mask set.
121          * Since shared usb code relies on it, set it here for now.
122          * Once we move to full device tree support this will vanish off.
123          */
124         ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
125         if (ret)
126                 return ret;
127 
128         platform_set_drvdata(pdev, exynos);
129 
130         ret = dwc3_exynos_register_phys(exynos);
131         if (ret) {
132                 dev_err(dev, "couldn't register PHYs\n");
133                 return ret;
134         }
135 
136         clk = devm_clk_get(dev, "usbdrd30");
137         if (IS_ERR(clk)) {
138                 dev_err(dev, "couldn't get clock\n");
139                 return -EINVAL;
140         }
141 
142         exynos->dev     = dev;
143         exynos->clk     = clk;
144 
145         clk_prepare_enable(exynos->clk);
146 
147         exynos->vdd33 = devm_regulator_get(dev, "vdd33");
148         if (IS_ERR(exynos->vdd33)) {
149                 ret = PTR_ERR(exynos->vdd33);
150                 goto err2;
151         }
152         ret = regulator_enable(exynos->vdd33);
153         if (ret) {
154                 dev_err(dev, "Failed to enable VDD33 supply\n");
155                 goto err2;
156         }
157 
158         exynos->vdd10 = devm_regulator_get(dev, "vdd10");
159         if (IS_ERR(exynos->vdd10)) {
160                 ret = PTR_ERR(exynos->vdd10);
161                 goto err3;
162         }
163         ret = regulator_enable(exynos->vdd10);
164         if (ret) {
165                 dev_err(dev, "Failed to enable VDD10 supply\n");
166                 goto err3;
167         }
168 
169         if (node) {
170                 ret = of_platform_populate(node, NULL, NULL, dev);
171                 if (ret) {
172                         dev_err(dev, "failed to add dwc3 core\n");
173                         goto err4;
174                 }
175         } else {
176                 dev_err(dev, "no device node, failed to add dwc3 core\n");
177                 ret = -ENODEV;
178                 goto err4;
179         }
180 
181         return 0;
182 
183 err4:
184         regulator_disable(exynos->vdd10);
185 err3:
186         regulator_disable(exynos->vdd33);
187 err2:
188         clk_disable_unprepare(clk);
189         return ret;
190 }
191 
192 static int dwc3_exynos_remove(struct platform_device *pdev)
193 {
194         struct dwc3_exynos      *exynos = platform_get_drvdata(pdev);
195 
196         device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
197         platform_device_unregister(exynos->usb2_phy);
198         platform_device_unregister(exynos->usb3_phy);
199 
200         clk_disable_unprepare(exynos->clk);
201 
202         regulator_disable(exynos->vdd33);
203         regulator_disable(exynos->vdd10);
204 
205         return 0;
206 }
207 
208 #ifdef CONFIG_OF
209 static const struct of_device_id exynos_dwc3_match[] = {
210         { .compatible = "samsung,exynos5250-dwusb3" },
211         {},
212 };
213 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
214 #endif
215 
216 #ifdef CONFIG_PM_SLEEP
217 static int dwc3_exynos_suspend(struct device *dev)
218 {
219         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
220 
221         clk_disable(exynos->clk);
222 
223         regulator_disable(exynos->vdd33);
224         regulator_disable(exynos->vdd10);
225 
226         return 0;
227 }
228 
229 static int dwc3_exynos_resume(struct device *dev)
230 {
231         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
232         int ret;
233 
234         ret = regulator_enable(exynos->vdd33);
235         if (ret) {
236                 dev_err(dev, "Failed to enable VDD33 supply\n");
237                 return ret;
238         }
239         ret = regulator_enable(exynos->vdd10);
240         if (ret) {
241                 dev_err(dev, "Failed to enable VDD10 supply\n");
242                 return ret;
243         }
244 
245         clk_enable(exynos->clk);
246 
247         /* runtime set active to reflect active state. */
248         pm_runtime_disable(dev);
249         pm_runtime_set_active(dev);
250         pm_runtime_enable(dev);
251 
252         return 0;
253 }
254 
255 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
256         SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
257 };
258 
259 #define DEV_PM_OPS      (&dwc3_exynos_dev_pm_ops)
260 #else
261 #define DEV_PM_OPS      NULL
262 #endif /* CONFIG_PM_SLEEP */
263 
264 static struct platform_driver dwc3_exynos_driver = {
265         .probe          = dwc3_exynos_probe,
266         .remove         = dwc3_exynos_remove,
267         .driver         = {
268                 .name   = "exynos-dwc3",
269                 .of_match_table = of_match_ptr(exynos_dwc3_match),
270                 .pm     = DEV_PM_OPS,
271         },
272 };
273 
274 module_platform_driver(dwc3_exynos_driver);
275 
276 MODULE_ALIAS("platform:exynos-dwc3");
277 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
278 MODULE_LICENSE("GPL v2");
279 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");
280 

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