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
 31struct 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
 39static 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
 82err3:
 83	platform_device_del(exynos->usb2_phy);
 84
 85err2:
 86	platform_device_put(exynos->usb3_phy);
 87
 88err1:
 89	platform_device_put(exynos->usb2_phy);
 90
 91	return ret;
 92}
 93
 94static 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
103static 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
161err2:
162	clk_disable_unprepare(clk);
163err1:
164	return ret;
165}
166
167static 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
181static const struct of_device_id exynos_dwc3_match[] = {
182	{ .compatible = "samsung,exynos5250-dwusb3" },
183	{},
184};
185MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
186#endif
187
188#ifdef CONFIG_PM_SLEEP
189static 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
198static 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
212static 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
221static 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
231module_platform_driver(dwc3_exynos_driver);
232
233MODULE_ALIAS("platform:exynos-dwc3");
234MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
235MODULE_LICENSE("GPL v2");
236MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");