[mirror_ubuntu-artful-kernel.git] / drivers / usb / dwc3 / dwc3-exynos.c

/**
 * dwc3-exynos.c - Samsung EXYNOS DWC3 Specific Glue layer
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com
 *
 * Author: Anton Tikhomirov <av.tikhomirov@samsung.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2  of
 * the License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/usb/otg.h>
#include <linux/usb/usb_phy_generic.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/regulator/consumer.h>

struct dwc3_exynos {
	struct platform_device	*usb2_phy;
	struct platform_device	*usb3_phy;
	struct device		*dev;

	struct clk		*clk;
	struct clk		*susp_clk;
	struct clk		*axius_clk;

	struct regulator	*vdd33;
	struct regulator	*vdd10;
};

static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
{
	struct usb_phy_generic_platform_data pdata;
	struct platform_device	*pdev;
	int			ret;

	memset(&pdata, 0x00, sizeof(pdata));

	pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
	if (!pdev)
		return -ENOMEM;

	exynos->usb2_phy = pdev;
	pdata.type = USB_PHY_TYPE_USB2;
	pdata.gpio_reset = -1;

	ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
	if (ret)
		goto err1;

	pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
	if (!pdev) {
		ret = -ENOMEM;
		goto err1;
	}

	exynos->usb3_phy = pdev;
	pdata.type = USB_PHY_TYPE_USB3;

	ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
	if (ret)
		goto err2;

	ret = platform_device_add(exynos->usb2_phy);
	if (ret)
		goto err2;

	ret = platform_device_add(exynos->usb3_phy);
	if (ret)
		goto err3;

	return 0;

err3:
	platform_device_del(exynos->usb2_phy);

err2:
	platform_device_put(exynos->usb3_phy);

err1:
	platform_device_put(exynos->usb2_phy);

	return ret;
}

static int dwc3_exynos_remove_child(struct device *dev, void *unused)
{
	struct platform_device *pdev = to_platform_device(dev);

	platform_device_unregister(pdev);

	return 0;
}

static int dwc3_exynos_probe(struct platform_device *pdev)
{
	struct dwc3_exynos	*exynos;
	struct device		*dev = &pdev->dev;
	struct device_node	*node = dev->of_node;

	int			ret;

	exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
	if (!exynos)
		return -ENOMEM;

	platform_set_drvdata(pdev, exynos);

	exynos->dev	= dev;

	exynos->clk = devm_clk_get(dev, "usbdrd30");
	if (IS_ERR(exynos->clk)) {
		dev_err(dev, "couldn't get clock\n");
		return -EINVAL;
	}
	clk_prepare_enable(exynos->clk);

	exynos->susp_clk = devm_clk_get(dev, "usbdrd30_susp_clk");
	if (IS_ERR(exynos->susp_clk)) {
		dev_info(dev, "no suspend clk specified\n");
		exynos->susp_clk = NULL;
	}
	clk_prepare_enable(exynos->susp_clk);

	if (of_device_is_compatible(node, "samsung,exynos7-dwusb3")) {
		exynos->axius_clk = devm_clk_get(dev, "usbdrd30_axius_clk");
		if (IS_ERR(exynos->axius_clk)) {
			dev_err(dev, "no AXI UpScaler clk specified\n");
			ret = -ENODEV;
			goto axius_clk_err;
		}
		clk_prepare_enable(exynos->axius_clk);
	} else {
		exynos->axius_clk = NULL;
	}

	exynos->vdd33 = devm_regulator_get(dev, "vdd33");
	if (IS_ERR(exynos->vdd33)) {
		ret = PTR_ERR(exynos->vdd33);
		goto err2;
	}
	ret = regulator_enable(exynos->vdd33);
	if (ret) {
		dev_err(dev, "Failed to enable VDD33 supply\n");
		goto err2;
	}

	exynos->vdd10 = devm_regulator_get(dev, "vdd10");
	if (IS_ERR(exynos->vdd10)) {
		ret = PTR_ERR(exynos->vdd10);
		goto err3;
	}
	ret = regulator_enable(exynos->vdd10);
	if (ret) {
		dev_err(dev, "Failed to enable VDD10 supply\n");
		goto err3;
	}

	ret = dwc3_exynos_register_phys(exynos);
	if (ret) {
		dev_err(dev, "couldn't register PHYs\n");
		goto err4;
	}

	if (node) {
		ret = of_platform_populate(node, NULL, NULL, dev);
		if (ret) {
			dev_err(dev, "failed to add dwc3 core\n");
			goto err5;
		}
	} else {
		dev_err(dev, "no device node, failed to add dwc3 core\n");
		ret = -ENODEV;
		goto err5;
	}

	return 0;

err5:
	platform_device_unregister(exynos->usb2_phy);
	platform_device_unregister(exynos->usb3_phy);
err4:
	regulator_disable(exynos->vdd10);
err3:
	regulator_disable(exynos->vdd33);
err2:
	clk_disable_unprepare(exynos->axius_clk);
axius_clk_err:
	clk_disable_unprepare(exynos->susp_clk);
	clk_disable_unprepare(exynos->clk);
	return ret;
}

static int dwc3_exynos_remove(struct platform_device *pdev)
{
	struct dwc3_exynos	*exynos = platform_get_drvdata(pdev);

	device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
	platform_device_unregister(exynos->usb2_phy);
	platform_device_unregister(exynos->usb3_phy);

	clk_disable_unprepare(exynos->axius_clk);
	clk_disable_unprepare(exynos->susp_clk);
	clk_disable_unprepare(exynos->clk);

	regulator_disable(exynos->vdd33);
	regulator_disable(exynos->vdd10);

	return 0;
}

static const struct of_device_id exynos_dwc3_match[] = {
	{ .compatible = "samsung,exynos5250-dwusb3" },
	{ .compatible = "samsung,exynos7-dwusb3" },
	{},
};
MODULE_DEVICE_TABLE(of, exynos_dwc3_match);

#ifdef CONFIG_PM_SLEEP
static int dwc3_exynos_suspend(struct device *dev)
{
	struct dwc3_exynos *exynos = dev_get_drvdata(dev);

	clk_disable(exynos->axius_clk);
	clk_disable(exynos->clk);

	regulator_disable(exynos->vdd33);
	regulator_disable(exynos->vdd10);

	return 0;
}

static int dwc3_exynos_resume(struct device *dev)
{
	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
	int ret;

	ret = regulator_enable(exynos->vdd33);
	if (ret) {
		dev_err(dev, "Failed to enable VDD33 supply\n");
		return ret;
	}
	ret = regulator_enable(exynos->vdd10);
	if (ret) {
		dev_err(dev, "Failed to enable VDD10 supply\n");
		return ret;
	}

	clk_enable(exynos->clk);
	clk_enable(exynos->axius_clk);

	/* runtime set active to reflect active state. */
	pm_runtime_disable(dev);
	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);

	return 0;
}

static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
};

#define DEV_PM_OPS	(&dwc3_exynos_dev_pm_ops)
#else
#define DEV_PM_OPS	NULL
#endif /* CONFIG_PM_SLEEP */

static struct platform_driver dwc3_exynos_driver = {
	.probe		= dwc3_exynos_probe,
	.remove		= dwc3_exynos_remove,
	.driver		= {
		.name	= "exynos-dwc3",
		.of_match_table = exynos_dwc3_match,
		.pm	= DEV_PM_OPS,
	},
};

module_platform_driver(dwc3_exynos_driver);

MODULE_ALIAS("platform:exynos-dwc3");
MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");
Commit	Line	Data
d28a9689 AT	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	*
5945f789 FB	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.
d28a9689 AT	17	*/
	18
	19	#include <linux/module.h>
	20	#include <linux/kernel.h>
	21	#include <linux/slab.h>
	22	#include <linux/platform_device.h>
d28a9689	23	#include <linux/clk.h>
d720f057	24	#include <linux/usb/otg.h>
d7078df6	25	#include <linux/usb/usb_phy_generic.h>
accefdd4	26	#include <linux/of.h>
adcf20dc	27	#include <linux/of_platform.h>
bd8ce544	28	#include <linux/regulator/consumer.h>
d28a9689	29
d28a9689	30	struct dwc3_exynos {
d720f057 FB	31	struct platform_device *usb2_phy;
d720f057 FB	32	struct platform_device *usb3_phy;
d28a9689 AT	33	struct device *dev;
	34
	35	struct clk *clk;
72d996fc	36	struct clk *susp_clk;
ed692a99	37	struct clk *axius_clk;
72d996fc	38
bd8ce544 VG	39	struct regulator *vdd33;
bd8ce544 VG	40	struct regulator *vdd10;
d28a9689 AT	41	};
d28a9689 AT	42
41ac7b3a	43	static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
d720f057	44	{
4525beeb	45	struct usb_phy_generic_platform_data pdata;
d720f057 FB	46	struct platform_device *pdev;
	47	int ret;
	48
	49	memset(&pdata, 0x00, sizeof(pdata));
	50
4525beeb	51	pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
d720f057 FB	52	if (!pdev)
	53	return -ENOMEM;
	54
	55	exynos->usb2_phy = pdev;
	56	pdata.type = USB_PHY_TYPE_USB2;
13518673	57	pdata.gpio_reset = -1;
d720f057 FB	58
	59	ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
	60	if (ret)
	61	goto err1;
	62
4525beeb	63	pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
d720f057 FB	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
	86	err3:
	87	platform_device_del(exynos->usb2_phy);
	88
	89	err2:
	90	platform_device_put(exynos->usb3_phy);
	91
	92	err1:
	93	platform_device_put(exynos->usb2_phy);
	94
	95	return ret;
	96	}
	97
adcf20dc VG	98	static 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
41ac7b3a	107	static int dwc3_exynos_probe(struct platform_device *pdev)
d28a9689	108	{
d28a9689	109	struct dwc3_exynos *exynos;
20b97dc1	110	struct device *dev = &pdev->dev;
adcf20dc	111	struct device_node *node = dev->of_node;
d28a9689	112
b09e99ee	113	int ret;
d28a9689	114
20b97dc1	115	exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
734d5a53	116	if (!exynos)
b09e99ee	117	return -ENOMEM;
d28a9689 AT	118
	119	platform_set_drvdata(pdev, exynos);
	120
c1a3acaa VG	121	exynos->dev = dev;
	122
	123	exynos->clk = devm_clk_get(dev, "usbdrd30");
	124	if (IS_ERR(exynos->clk)) {
20b97dc1	125	dev_err(dev, "couldn't get clock\n");
b09e99ee	126	return -EINVAL;
d28a9689	127	}
ddb5147c	128	clk_prepare_enable(exynos->clk);
d28a9689	129
72d996fc VG	130	exynos->susp_clk = devm_clk_get(dev, "usbdrd30_susp_clk");
72d996fc VG	131	if (IS_ERR(exynos->susp_clk)) {
42f69a02	132	dev_info(dev, "no suspend clk specified\n");
72d996fc VG	133	exynos->susp_clk = NULL;
	134	}
	135	clk_prepare_enable(exynos->susp_clk);
	136
ed692a99 VG	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");
8ae584d1 SK	141	ret = -ENODEV;
8ae584d1 SK	142	goto axius_clk_err;
ed692a99 VG	143	}
	144	clk_prepare_enable(exynos->axius_clk);
	145	} else {
	146	exynos->axius_clk = NULL;
	147	}
	148
bd8ce544 VG	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
4879efb3 SG	171	ret = dwc3_exynos_register_phys(exynos);
	172	if (ret) {
	173	dev_err(dev, "couldn't register PHYs\n");
	174	goto err4;
	175	}
	176
adcf20dc VG	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");
4879efb3	181	goto err5;
adcf20dc VG	182	}
	183	} else {
	184	dev_err(dev, "no device node, failed to add dwc3 core\n");
	185	ret = -ENODEV;
4879efb3	186	goto err5;
d28a9689 AT	187	}
	188
	189	return 0;
	190
4879efb3 SG	191	err5:
	192	platform_device_unregister(exynos->usb2_phy);
	193	platform_device_unregister(exynos->usb3_phy);
bd8ce544 VG	194	err4:
	195	regulator_disable(exynos->vdd10);
	196	err3:
	197	regulator_disable(exynos->vdd33);
20b97dc1	198	err2:
ed692a99	199	clk_disable_unprepare(exynos->axius_clk);
8ae584d1	200	axius_clk_err:
72d996fc	201	clk_disable_unprepare(exynos->susp_clk);
c1a3acaa	202	clk_disable_unprepare(exynos->clk);
d28a9689 AT	203	return ret;
	204	}
	205
fb4e98ab	206	static int dwc3_exynos_remove(struct platform_device *pdev)
d28a9689 AT	207	{
d28a9689 AT	208	struct dwc3_exynos *exynos = platform_get_drvdata(pdev);
d28a9689	209
022d0547	210	device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
d720f057 FB	211	platform_device_unregister(exynos->usb2_phy);
d720f057 FB	212	platform_device_unregister(exynos->usb3_phy);
d28a9689	213
ed692a99	214	clk_disable_unprepare(exynos->axius_clk);
72d996fc	215	clk_disable_unprepare(exynos->susp_clk);
ddb5147c	216	clk_disable_unprepare(exynos->clk);
d28a9689	217
bd8ce544 VG	218	regulator_disable(exynos->vdd33);
	219	regulator_disable(exynos->vdd10);
	220
d28a9689 AT	221	return 0;
	222	}
	223
accefdd4	224	static const struct of_device_id exynos_dwc3_match[] = {
fe29db8f	225	{ .compatible = "samsung,exynos5250-dwusb3" },
ed692a99	226	{ .compatible = "samsung,exynos7-dwusb3" },
accefdd4 VG	227	{},
	228	};
	229	MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
accefdd4	230
19fda7cd	231	#ifdef CONFIG_PM_SLEEP
0646caf7 VS	232	static int dwc3_exynos_suspend(struct device *dev)
	233	{
	234	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
	235
ed692a99	236	clk_disable(exynos->axius_clk);
0646caf7 VS	237	clk_disable(exynos->clk);
0646caf7 VS	238
bd8ce544 VG	239	regulator_disable(exynos->vdd33);
	240	regulator_disable(exynos->vdd10);
	241
0646caf7 VS	242	return 0;
	243	}
	244
	245	static int dwc3_exynos_resume(struct device *dev)
	246	{
	247	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
bd8ce544 VG	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	}
0646caf7 VS	260
0646caf7 VS	261	clk_enable(exynos->clk);
ed692a99	262	clk_enable(exynos->axius_clk);
0646caf7 VS	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
	272	static 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
19fda7cd	279	#endif /* CONFIG_PM_SLEEP */
0646caf7	280
d28a9689 AT	281	static struct platform_driver dwc3_exynos_driver = {
d28a9689 AT	282	.probe = dwc3_exynos_probe,
7690417d	283	.remove = dwc3_exynos_remove,
d28a9689 AT	284	.driver = {
d28a9689 AT	285	.name = "exynos-dwc3",
b4c9f578	286	.of_match_table = exynos_dwc3_match,
0646caf7	287	.pm = DEV_PM_OPS,
d28a9689 AT	288	},
	289	};
	290
	291	module_platform_driver(dwc3_exynos_driver);
	292
	293	MODULE_ALIAS("platform:exynos-dwc3");
	294	MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
5945f789	295	MODULE_LICENSE("GPL v2");
d28a9689	296	MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");