2 * dwc3-exynos.c - Samsung EXYNOS DWC3 Specific Glue layer
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com
7 * Author: Anton Tikhomirov <av.tikhomirov@samsung.com>
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.
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.
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>
29 #include <linux/of_platform.h>
32 struct platform_device *usb2_phy;
33 struct platform_device *usb3_phy;
39 static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
41 struct usb_phy_gen_xceiv_platform_data pdata;
42 struct platform_device *pdev;
45 memset(&pdata, 0x00, sizeof(pdata));
47 pdev = platform_device_alloc("usb_phy_gen_xceiv", PLATFORM_DEVID_AUTO);
51 exynos->usb2_phy = pdev;
52 pdata.type = USB_PHY_TYPE_USB2;
54 ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
58 pdev = platform_device_alloc("usb_phy_gen_xceiv", PLATFORM_DEVID_AUTO);
64 exynos->usb3_phy = pdev;
65 pdata.type = USB_PHY_TYPE_USB3;
67 ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
71 ret = platform_device_add(exynos->usb2_phy);
75 ret = platform_device_add(exynos->usb3_phy);
82 platform_device_del(exynos->usb2_phy);
85 platform_device_put(exynos->usb3_phy);
88 platform_device_put(exynos->usb2_phy);
93 static int dwc3_exynos_remove_child(struct device *dev, void *unused)
95 struct platform_device *pdev = to_platform_device(dev);
97 platform_device_unregister(pdev);
102 static int dwc3_exynos_probe(struct platform_device *pdev)
104 struct dwc3_exynos *exynos;
106 struct device *dev = &pdev->dev;
107 struct device_node *node = dev->of_node;
111 exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
113 dev_err(dev, "not enough memory\n");
118 * Right now device-tree probed devices don't get dma_mask set.
119 * Since shared usb code relies on it, set it here for now.
120 * Once we move to full device tree support this will vanish off.
122 ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
126 platform_set_drvdata(pdev, exynos);
128 ret = dwc3_exynos_register_phys(exynos);
130 dev_err(dev, "couldn't register PHYs\n");
134 clk = devm_clk_get(dev, "usbdrd30");
136 dev_err(dev, "couldn't get clock\n");
144 clk_prepare_enable(exynos->clk);
147 ret = of_platform_populate(node, NULL, NULL, dev);
149 dev_err(dev, "failed to add dwc3 core\n");
153 dev_err(dev, "no device node, failed to add dwc3 core\n");
161 clk_disable_unprepare(clk);
166 static int dwc3_exynos_remove(struct platform_device *pdev)
168 struct dwc3_exynos *exynos = platform_get_drvdata(pdev);
170 device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
171 platform_device_unregister(exynos->usb2_phy);
172 platform_device_unregister(exynos->usb3_phy);
174 clk_disable_unprepare(exynos->clk);
180 static const struct of_device_id exynos_dwc3_match[] = {
181 { .compatible = "samsung,exynos5250-dwusb3" },
184 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
187 #ifdef CONFIG_PM_SLEEP
188 static int dwc3_exynos_suspend(struct device *dev)
190 struct dwc3_exynos *exynos = dev_get_drvdata(dev);
192 clk_disable(exynos->clk);
197 static int dwc3_exynos_resume(struct device *dev)
199 struct dwc3_exynos *exynos = dev_get_drvdata(dev);
201 clk_enable(exynos->clk);
203 /* runtime set active to reflect active state. */
204 pm_runtime_disable(dev);
205 pm_runtime_set_active(dev);
206 pm_runtime_enable(dev);
211 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
212 SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
215 #define DEV_PM_OPS (&dwc3_exynos_dev_pm_ops)
217 #define DEV_PM_OPS NULL
218 #endif /* CONFIG_PM_SLEEP */
220 static struct platform_driver dwc3_exynos_driver = {
221 .probe = dwc3_exynos_probe,
222 .remove = dwc3_exynos_remove,
224 .name = "exynos-dwc3",
225 .of_match_table = of_match_ptr(exynos_dwc3_match),
230 module_platform_driver(dwc3_exynos_driver);
232 MODULE_ALIAS("platform:exynos-dwc3");
233 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
234 MODULE_LICENSE("GPL v2");
235 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");