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/clk.h>
 24#include <linux/usb/otg.h>
 25#include <linux/usb/usb_phy_generic.h>
 26#include <linux/of.h>
 27#include <linux/of_platform.h>
 28#include <linux/regulator/consumer.h>
 29
 30struct dwc3_exynos {
 31	struct platform_device	*usb2_phy;
 32	struct platform_device	*usb3_phy;
 33	struct device		*dev;
 34
 35	struct clk		*clk;
 36	struct clk		*susp_clk;
 37	struct clk		*axius_clk;
 38
 39	struct regulator	*vdd33;
 40	struct regulator	*vdd10;
 41};
 42
 43static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
 44{
 45	struct usb_phy_generic_platform_data pdata;
 46	struct platform_device	*pdev;
 47	int			ret;
 48
 49	memset(&pdata, 0x00, sizeof(pdata));
 50
 51	pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
 52	if (!pdev)
 53		return -ENOMEM;
 54
 55	exynos->usb2_phy = pdev;
 56	pdata.type = USB_PHY_TYPE_USB2;
 57	pdata.gpio_reset = -1;
 58
 59	ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
 60	if (ret)
 61		goto err1;
 62
 63	pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
 64	if (!pdev) {
 65		ret = -ENOMEM;
 66		goto err1;
 67	}
 68
 69	exynos->usb3_phy = pdev;
 70	pdata.type = USB_PHY_TYPE_USB3;
 71
 72	ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
 73	if (ret)
 74		goto err2;
 75
 76	ret = platform_device_add(exynos->usb2_phy);
 77	if (ret)
 78		goto err2;
 79
 80	ret = platform_device_add(exynos->usb3_phy);
 81	if (ret)
 82		goto err3;
 83
 84	return 0;
 85
 86err3:
 87	platform_device_del(exynos->usb2_phy);
 88
 89err2:
 90	platform_device_put(exynos->usb3_phy);
 91
 92err1:
 93	platform_device_put(exynos->usb2_phy);
 94
 95	return ret;
 96}
 97
 98static int dwc3_exynos_remove_child(struct device *dev, void *unused)
 99{
100	struct platform_device *pdev = to_platform_device(dev);
101
102	platform_device_unregister(pdev);
103
104	return 0;
105}
106
107static int dwc3_exynos_probe(struct platform_device *pdev)
108{
109	struct dwc3_exynos	*exynos;
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		return -ENOMEM;
118
119	platform_set_drvdata(pdev, exynos);
120
121	exynos->dev	= dev;
122
123	exynos->clk = devm_clk_get(dev, "usbdrd30");
124	if (IS_ERR(exynos->clk)) {
125		dev_err(dev, "couldn't get clock\n");
126		return -EINVAL;
127	}
128	clk_prepare_enable(exynos->clk);
129
130	exynos->susp_clk = devm_clk_get(dev, "usbdrd30_susp_clk");
131	if (IS_ERR(exynos->susp_clk)) {
132		dev_info(dev, "no suspend clk specified\n");
133		exynos->susp_clk = NULL;
134	}
135	clk_prepare_enable(exynos->susp_clk);
136
137	if (of_device_is_compatible(node, "samsung,exynos7-dwusb3")) {
138		exynos->axius_clk = devm_clk_get(dev, "usbdrd30_axius_clk");
139		if (IS_ERR(exynos->axius_clk)) {
140			dev_err(dev, "no AXI UpScaler clk specified\n");
141			ret = -ENODEV;
142			goto axius_clk_err;
143		}
144		clk_prepare_enable(exynos->axius_clk);
145	} else {
146		exynos->axius_clk = NULL;
147	}
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	ret = dwc3_exynos_register_phys(exynos);
172	if (ret) {
173		dev_err(dev, "couldn't register PHYs\n");
174		goto err4;
175	}
176
177	if (node) {
178		ret = of_platform_populate(node, NULL, NULL, dev);
179		if (ret) {
180			dev_err(dev, "failed to add dwc3 core\n");
181			goto err5;
182		}
183	} else {
184		dev_err(dev, "no device node, failed to add dwc3 core\n");
185		ret = -ENODEV;
186		goto err5;
187	}
188
189	return 0;
190
191err5:
192	platform_device_unregister(exynos->usb2_phy);
193	platform_device_unregister(exynos->usb3_phy);
194err4:
195	regulator_disable(exynos->vdd10);
196err3:
197	regulator_disable(exynos->vdd33);
198err2:
199	clk_disable_unprepare(exynos->axius_clk);
200axius_clk_err:
201	clk_disable_unprepare(exynos->susp_clk);
202	clk_disable_unprepare(exynos->clk);
203	return ret;
204}
205
206static int dwc3_exynos_remove(struct platform_device *pdev)
207{
208	struct dwc3_exynos	*exynos = platform_get_drvdata(pdev);
209
210	device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
211	platform_device_unregister(exynos->usb2_phy);
212	platform_device_unregister(exynos->usb3_phy);
213
214	clk_disable_unprepare(exynos->axius_clk);
215	clk_disable_unprepare(exynos->susp_clk);
216	clk_disable_unprepare(exynos->clk);
217
218	regulator_disable(exynos->vdd33);
219	regulator_disable(exynos->vdd10);
220
221	return 0;
222}
223
224static const struct of_device_id exynos_dwc3_match[] = {
225	{ .compatible = "samsung,exynos5250-dwusb3" },
226	{ .compatible = "samsung,exynos7-dwusb3" },
227	{},
228};
229MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
230
231#ifdef CONFIG_PM_SLEEP
232static int dwc3_exynos_suspend(struct device *dev)
233{
234	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
235
236	clk_disable(exynos->axius_clk);
237	clk_disable(exynos->clk);
238
239	regulator_disable(exynos->vdd33);
240	regulator_disable(exynos->vdd10);
241
242	return 0;
243}
244
245static int dwc3_exynos_resume(struct device *dev)
246{
247	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
248	int ret;
249
250	ret = regulator_enable(exynos->vdd33);
251	if (ret) {
252		dev_err(dev, "Failed to enable VDD33 supply\n");
253		return ret;
254	}
255	ret = regulator_enable(exynos->vdd10);
256	if (ret) {
257		dev_err(dev, "Failed to enable VDD10 supply\n");
258		return ret;
259	}
260
261	clk_enable(exynos->clk);
262	clk_enable(exynos->axius_clk);
263
264	/* runtime set active to reflect active state. */
265	pm_runtime_disable(dev);
266	pm_runtime_set_active(dev);
267	pm_runtime_enable(dev);
268
269	return 0;
270}
271
272static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
273	SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
274};
275
276#define DEV_PM_OPS	(&dwc3_exynos_dev_pm_ops)
277#else
278#define DEV_PM_OPS	NULL
279#endif /* CONFIG_PM_SLEEP */
280
281static struct platform_driver dwc3_exynos_driver = {
282	.probe		= dwc3_exynos_probe,
283	.remove		= dwc3_exynos_remove,
284	.driver		= {
285		.name	= "exynos-dwc3",
286		.of_match_table = exynos_dwc3_match,
287		.pm	= DEV_PM_OPS,
288	},
289};
290
291module_platform_driver(dwc3_exynos_driver);
292
293MODULE_ALIAS("platform:exynos-dwc3");
294MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
295MODULE_LICENSE("GPL v2");
296MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");