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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                 dev_err(dev, "not enough memory\n");
118                 return -ENOMEM;
119         }
120 
121         /*
122          * Right now device-tree probed devices don't get dma_mask set.
123          * Since shared usb code relies on it, set it here for now.
124          * Once we move to full device tree support this will vanish off.
125          */
126         ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
127         if (ret)
128                 return ret;
129 
130         platform_set_drvdata(pdev, exynos);
131 
132         ret = dwc3_exynos_register_phys(exynos);
133         if (ret) {
134                 dev_err(dev, "couldn't register PHYs\n");
135                 return ret;
136         }
137 
138         clk = devm_clk_get(dev, "usbdrd30");
139         if (IS_ERR(clk)) {
140                 dev_err(dev, "couldn't get clock\n");
141                 return -EINVAL;
142         }
143 
144         exynos->dev     = dev;
145         exynos->clk     = clk;
146 
147         clk_prepare_enable(exynos->clk);
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         if (node) {
172                 ret = of_platform_populate(node, NULL, NULL, dev);
173                 if (ret) {
174                         dev_err(dev, "failed to add dwc3 core\n");
175                         goto err4;
176                 }
177         } else {
178                 dev_err(dev, "no device node, failed to add dwc3 core\n");
179                 ret = -ENODEV;
180                 goto err4;
181         }
182 
183         return 0;
184 
185 err4:
186         regulator_disable(exynos->vdd10);
187 err3:
188         regulator_disable(exynos->vdd33);
189 err2:
190         clk_disable_unprepare(clk);
191         return ret;
192 }
193 
194 static int dwc3_exynos_remove(struct platform_device *pdev)
195 {
196         struct dwc3_exynos      *exynos = platform_get_drvdata(pdev);
197 
198         device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
199         platform_device_unregister(exynos->usb2_phy);
200         platform_device_unregister(exynos->usb3_phy);
201 
202         clk_disable_unprepare(exynos->clk);
203 
204         regulator_disable(exynos->vdd33);
205         regulator_disable(exynos->vdd10);
206 
207         return 0;
208 }
209 
210 #ifdef CONFIG_OF
211 static const struct of_device_id exynos_dwc3_match[] = {
212         { .compatible = "samsung,exynos5250-dwusb3" },
213         {},
214 };
215 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
216 #endif
217 
218 #ifdef CONFIG_PM_SLEEP
219 static int dwc3_exynos_suspend(struct device *dev)
220 {
221         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
222 
223         clk_disable(exynos->clk);
224 
225         regulator_disable(exynos->vdd33);
226         regulator_disable(exynos->vdd10);
227 
228         return 0;
229 }
230 
231 static int dwc3_exynos_resume(struct device *dev)
232 {
233         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
234         int ret;
235 
236         ret = regulator_enable(exynos->vdd33);
237         if (ret) {
238                 dev_err(dev, "Failed to enable VDD33 supply\n");
239                 return ret;
240         }
241         ret = regulator_enable(exynos->vdd10);
242         if (ret) {
243                 dev_err(dev, "Failed to enable VDD10 supply\n");
244                 return ret;
245         }
246 
247         clk_enable(exynos->clk);
248 
249         /* runtime set active to reflect active state. */
250         pm_runtime_disable(dev);
251         pm_runtime_set_active(dev);
252         pm_runtime_enable(dev);
253 
254         return 0;
255 }
256 
257 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
258         SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
259 };
260 
261 #define DEV_PM_OPS      (&dwc3_exynos_dev_pm_ops)
262 #else
263 #define DEV_PM_OPS      NULL
264 #endif /* CONFIG_PM_SLEEP */
265 
266 static struct platform_driver dwc3_exynos_driver = {
267         .probe          = dwc3_exynos_probe,
268         .remove         = dwc3_exynos_remove,
269         .driver         = {
270                 .name   = "exynos-dwc3",
271                 .of_match_table = of_match_ptr(exynos_dwc3_match),
272                 .pm     = DEV_PM_OPS,
273         },
274 };
275 
276 module_platform_driver(dwc3_exynos_driver);
277 
278 MODULE_ALIAS("platform:exynos-dwc3");
279 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
280 MODULE_LICENSE("GPL v2");
281 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");
282 

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