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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_gen_xceiv.h>
 28 #include <linux/of.h>
 29 #include <linux/of_platform.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 };
 38 
 39 static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
 40 {
 41         struct usb_phy_gen_xceiv_platform_data pdata;
 42         struct platform_device  *pdev;
 43         int                     ret;
 44 
 45         memset(&pdata, 0x00, sizeof(pdata));
 46 
 47         pdev = platform_device_alloc("usb_phy_gen_xceiv", PLATFORM_DEVID_AUTO);
 48         if (!pdev)
 49                 return -ENOMEM;
 50 
 51         exynos->usb2_phy = pdev;
 52         pdata.type = USB_PHY_TYPE_USB2;
 53         pdata.gpio_reset = -1;
 54 
 55         ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
 56         if (ret)
 57                 goto err1;
 58 
 59         pdev = platform_device_alloc("usb_phy_gen_xceiv", PLATFORM_DEVID_AUTO);
 60         if (!pdev) {
 61                 ret = -ENOMEM;
 62                 goto err1;
 63         }
 64 
 65         exynos->usb3_phy = pdev;
 66         pdata.type = USB_PHY_TYPE_USB3;
 67 
 68         ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
 69         if (ret)
 70                 goto err2;
 71 
 72         ret = platform_device_add(exynos->usb2_phy);
 73         if (ret)
 74                 goto err2;
 75 
 76         ret = platform_device_add(exynos->usb3_phy);
 77         if (ret)
 78                 goto err3;
 79 
 80         return 0;
 81 
 82 err3:
 83         platform_device_del(exynos->usb2_phy);
 84 
 85 err2:
 86         platform_device_put(exynos->usb3_phy);
 87 
 88 err1:
 89         platform_device_put(exynos->usb2_phy);
 90 
 91         return ret;
 92 }
 93 
 94 static int dwc3_exynos_remove_child(struct device *dev, void *unused)
 95 {
 96         struct platform_device *pdev = to_platform_device(dev);
 97 
 98         platform_device_unregister(pdev);
 99 
100         return 0;
101 }
102 
103 static int dwc3_exynos_probe(struct platform_device *pdev)
104 {
105         struct dwc3_exynos      *exynos;
106         struct clk              *clk;
107         struct device           *dev = &pdev->dev;
108         struct device_node      *node = dev->of_node;
109 
110         int                     ret = -ENOMEM;
111 
112         exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
113         if (!exynos) {
114                 dev_err(dev, "not enough memory\n");
115                 goto err1;
116         }
117 
118         /*
119          * Right now device-tree probed devices don't get dma_mask set.
120          * Since shared usb code relies on it, set it here for now.
121          * Once we move to full device tree support this will vanish off.
122          */
123         ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
124         if (ret)
125                 goto err1;
126 
127         platform_set_drvdata(pdev, exynos);
128 
129         ret = dwc3_exynos_register_phys(exynos);
130         if (ret) {
131                 dev_err(dev, "couldn't register PHYs\n");
132                 goto err1;
133         }
134 
135         clk = devm_clk_get(dev, "usbdrd30");
136         if (IS_ERR(clk)) {
137                 dev_err(dev, "couldn't get clock\n");
138                 ret = -EINVAL;
139                 goto err1;
140         }
141 
142         exynos->dev     = dev;
143         exynos->clk     = clk;
144 
145         clk_prepare_enable(exynos->clk);
146 
147         if (node) {
148                 ret = of_platform_populate(node, NULL, NULL, dev);
149                 if (ret) {
150                         dev_err(dev, "failed to add dwc3 core\n");
151                         goto err2;
152                 }
153         } else {
154                 dev_err(dev, "no device node, failed to add dwc3 core\n");
155                 ret = -ENODEV;
156                 goto err2;
157         }
158 
159         return 0;
160 
161 err2:
162         clk_disable_unprepare(clk);
163 err1:
164         return ret;
165 }
166 
167 static int dwc3_exynos_remove(struct platform_device *pdev)
168 {
169         struct dwc3_exynos      *exynos = platform_get_drvdata(pdev);
170 
171         device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
172         platform_device_unregister(exynos->usb2_phy);
173         platform_device_unregister(exynos->usb3_phy);
174 
175         clk_disable_unprepare(exynos->clk);
176 
177         return 0;
178 }
179 
180 #ifdef CONFIG_OF
181 static const struct of_device_id exynos_dwc3_match[] = {
182         { .compatible = "samsung,exynos5250-dwusb3" },
183         {},
184 };
185 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
186 #endif
187 
188 #ifdef CONFIG_PM_SLEEP
189 static int dwc3_exynos_suspend(struct device *dev)
190 {
191         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
192 
193         clk_disable(exynos->clk);
194 
195         return 0;
196 }
197 
198 static int dwc3_exynos_resume(struct device *dev)
199 {
200         struct dwc3_exynos *exynos = dev_get_drvdata(dev);
201 
202         clk_enable(exynos->clk);
203 
204         /* runtime set active to reflect active state. */
205         pm_runtime_disable(dev);
206         pm_runtime_set_active(dev);
207         pm_runtime_enable(dev);
208 
209         return 0;
210 }
211 
212 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
213         SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
214 };
215 
216 #define DEV_PM_OPS      (&dwc3_exynos_dev_pm_ops)
217 #else
218 #define DEV_PM_OPS      NULL
219 #endif /* CONFIG_PM_SLEEP */
220 
221 static struct platform_driver dwc3_exynos_driver = {
222         .probe          = dwc3_exynos_probe,
223         .remove         = dwc3_exynos_remove,
224         .driver         = {
225                 .name   = "exynos-dwc3",
226                 .of_match_table = of_match_ptr(exynos_dwc3_match),
227                 .pm     = DEV_PM_OPS,
228         },
229 };
230 
231 module_platform_driver(dwc3_exynos_driver);
232 
233 MODULE_ALIAS("platform:exynos-dwc3");
234 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
235 MODULE_LICENSE("GPL v2");
236 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");
237 

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