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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/dma-mapping.h>
 24 #include <linux/clk.h>
 25 #include <linux/usb/otg.h>
 26 #include <linux/usb/usb_phy_generic.h>
 27 #include <linux/of.h>
 28 #include <linux/of_platform.h>
 29 #include <linux/regulator/consumer.h>
 30 
 31 struct dwc3_exynos {
 32         struct platform_device  *usb2_phy;
 33         struct platform_device  *usb3_phy;
 34         struct device           *dev;
 35 
 36         struct clk              *clk;
 37         struct clk              *susp_clk;
 38         struct clk              *axius_clk;
 39 
 40         struct regulator        *vdd33;
 41         struct regulator        *vdd10;
 42 };
 43 
 44 static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
 45 {
 46         struct usb_phy_generic_platform_data pdata;
 47         struct platform_device  *pdev;
 48         int                     ret;
 49 
 50         memset(&pdata, 0x00, sizeof(pdata));
 51 
 52         pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
 53         if (!pdev)
 54                 return -ENOMEM;
 55 
 56         exynos->usb2_phy = pdev;
 57         pdata.type = USB_PHY_TYPE_USB2;
 58         pdata.gpio_reset = -1;
 59 
 60         ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
 61         if (ret)
 62                 goto err1;
 63 
 64         pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
 65         if (!pdev) {
 66                 ret = -ENOMEM;
 67                 goto err1;
 68         }
 69 
 70         exynos->usb3_phy = pdev;
 71         pdata.type = USB_PHY_TYPE_USB3;
 72 
 73         ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
 74         if (ret)
 75                 goto err2;
 76 
 77         ret = platform_device_add(exynos->usb2_phy);
 78         if (ret)
 79                 goto err2;
 80 
 81         ret = platform_device_add(exynos->usb3_phy);
 82         if (ret)
 83                 goto err3;
 84 
 85         return 0;
 86 
 87 err3:
 88         platform_device_del(exynos->usb2_phy);
 89 
 90 err2:
 91         platform_device_put(exynos->usb3_phy);
 92 
 93 err1:
 94         platform_device_put(exynos->usb2_phy);
 95 
 96         return ret;
 97 }
 98 
 99 static int dwc3_exynos_remove_child(struct device *dev, void *unused)
100 {
101         struct platform_device *pdev = to_platform_device(dev);
102 
103         platform_device_unregister(pdev);
104 
105         return 0;
106 }
107 
108 static int dwc3_exynos_probe(struct platform_device *pdev)
109 {
110         struct dwc3_exynos      *exynos;
111         struct device           *dev = &pdev->dev;
112         struct device_node      *node = dev->of_node;
113 
114         int                     ret;
115 
116         exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
117         if (!exynos)
118                 return -ENOMEM;
119 
120         /*
121          * Right now device-tree probed devices don't get dma_mask set.
122          * Since shared usb code relies on it, set it here for now.
123          * Once we move to full device tree support this will vanish off.
124          */
125         ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
126         if (ret)
127                 return ret;
128 
129         platform_set_drvdata(pdev, exynos);
130 
131         ret = dwc3_exynos_register_phys(exynos);
132         if (ret) {
133                 dev_err(dev, "couldn't register PHYs\n");
134                 return ret;
135         }
136 
137         exynos->dev     = dev;
138 
139         exynos->clk = devm_clk_get(dev, "usbdrd30");
140         if (IS_ERR(exynos->clk)) {
141                 dev_err(dev, "couldn't get clock\n");
142                 return -EINVAL;
143         }
144         clk_prepare_enable(exynos->clk);
145 
146         exynos->susp_clk = devm_clk_get(dev, "usbdrd30_susp_clk");
147         if (IS_ERR(exynos->susp_clk)) {
148                 dev_dbg(dev, "no suspend clk specified\n");
149                 exynos->susp_clk = NULL;
150         }
151         clk_prepare_enable(exynos->susp_clk);
152 
153         if (of_device_is_compatible(node, "samsung,exynos7-dwusb3")) {
154                 exynos->axius_clk = devm_clk_get(dev, "usbdrd30_axius_clk");
155                 if (IS_ERR(exynos->axius_clk)) {
156                         dev_err(dev, "no AXI UpScaler clk specified\n");
157                         return -ENODEV;
158                 }
159                 clk_prepare_enable(exynos->axius_clk);
160         } else {
161                 exynos->axius_clk = NULL;
162         }
163 
164         exynos->vdd33 = devm_regulator_get(dev, "vdd33");
165         if (IS_ERR(exynos->vdd33)) {
166                 ret = PTR_ERR(exynos->vdd33);
167                 goto err2;
168         }
169         ret = regulator_enable(exynos->vdd33);
170         if (ret) {
171                 dev_err(dev, "Failed to enable VDD33 supply\n");
172                 goto err2;
173         }
174 
175         exynos->vdd10 = devm_regulator_get(dev, "vdd10");
176         if (IS_ERR(exynos->vdd10)) {
177                 ret = PTR_ERR(exynos->vdd10);
178                 goto err3;
179         }
180         ret = regulator_enable(exynos->vdd10);
181         if (ret) {
182                 dev_err(dev, "Failed to enable VDD10 supply\n");
183                 goto err3;
184         }
185 
186         if (node) {
187                 ret = of_platform_populate(node, NULL, NULL, dev);
188                 if (ret) {
189                         dev_err(dev, "failed to add dwc3 core\n");
190                         goto err4;
191                 }
192         } else {
193                 dev_err(dev, "no device node, failed to add dwc3 core\n");
194                 ret = -ENODEV;
195                 goto err4;
196         }
197 
198         return 0;
199 
200 err4:
201         regulator_disable(exynos->vdd10);
202 err3:
203         regulator_disable(exynos->vdd33);
204 err2:
205         clk_disable_unprepare(exynos->axius_clk);
206         clk_disable_unprepare(exynos->susp_clk);
207         clk_disable_unprepare(exynos->clk);
208         return ret;
209 }
210 
211 static int dwc3_exynos_remove(struct platform_device *pdev)
212 {
213         struct dwc3_exynos      *exynos = platform_get_drvdata(pdev);
214 
215         device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
216         platform_device_unregister(exynos->usb2_phy);
217         platform_device_unregister(exynos->usb3_phy);
218 
219         clk_disable_unprepare(exynos->axius_clk);
220         clk_disable_unprepare(exynos->susp_clk);
221         clk_disable_unprepare(exynos->clk);
222 
223         regulator_disable(exynos->vdd33);
224         regulator_disable(exynos->vdd10);
225 
226         return 0;
227 }
228 
229 static const struct of_device_id exynos_dwc3_match[] = {
230         { .compatible = "samsung,exynos5250-dwusb3" },
231         { .compatible = "samsung,exynos7-dwusb3" },
232         {},
233 };
234 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
235 
236 #ifdef CONFIG_PM_SLEEP
237 static int dwc3_exynos_suspend(struct device *dev)
238 {
239         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
240 
241         clk_disable(exynos->axius_clk);
242         clk_disable(exynos->clk);
243 
244         regulator_disable(exynos->vdd33);
245         regulator_disable(exynos->vdd10);
246 
247         return 0;
248 }
249 
250 static int dwc3_exynos_resume(struct device *dev)
251 {
252         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
253         int ret;
254 
255         ret = regulator_enable(exynos->vdd33);
256         if (ret) {
257                 dev_err(dev, "Failed to enable VDD33 supply\n");
258                 return ret;
259         }
260         ret = regulator_enable(exynos->vdd10);
261         if (ret) {
262                 dev_err(dev, "Failed to enable VDD10 supply\n");
263                 return ret;
264         }
265 
266         clk_enable(exynos->clk);
267         clk_enable(exynos->axius_clk);
268 
269         /* runtime set active to reflect active state. */
270         pm_runtime_disable(dev);
271         pm_runtime_set_active(dev);
272         pm_runtime_enable(dev);
273 
274         return 0;
275 }
276 
277 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
278         SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
279 };
280 
281 #define DEV_PM_OPS      (&dwc3_exynos_dev_pm_ops)
282 #else
283 #define DEV_PM_OPS      NULL
284 #endif /* CONFIG_PM_SLEEP */
285 
286 static struct platform_driver dwc3_exynos_driver = {
287         .probe          = dwc3_exynos_probe,
288         .remove         = dwc3_exynos_remove,
289         .driver         = {
290                 .name   = "exynos-dwc3",
291                 .of_match_table = exynos_dwc3_match,
292                 .pm     = DEV_PM_OPS,
293         },
294 };
295 
296 module_platform_driver(dwc3_exynos_driver);
297 
298 MODULE_ALIAS("platform:exynos-dwc3");
299 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
300 MODULE_LICENSE("GPL v2");
301 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");
302 

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