[linux-block.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 as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/platform_data/dwc3-exynos.h>
#include <linux/dma-mapping.h>
#include <linux/clk.h>
#include <linux/usb/otg.h>
#include <linux/usb/nop-usb-xceiv.h>
#include <linux/of.h>
#include <linux/of_platform.h>

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

	struct clk		*clk;
};

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

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

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

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

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

	pdev = platform_device_alloc("nop_usb_xceiv", 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 clk		*clk;
	struct device		*dev = &pdev->dev;
	struct device_node	*node = dev->of_node;

	int			ret = -ENOMEM;

	exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
	if (!exynos) {
		dev_err(dev, "not enough memory\n");
		goto err1;
	}

	/*
	 * Right now device-tree probed devices don't get dma_mask set.
	 * Since shared usb code relies on it, set it here for now.
	 * Once we move to full device tree support this will vanish off.
	 */
	if (!dev->dma_mask)
		dev->dma_mask = &dev->coherent_dma_mask;
	if (!dev->coherent_dma_mask)
		dev->coherent_dma_mask = DMA_BIT_MASK(32);

	platform_set_drvdata(pdev, exynos);

	ret = dwc3_exynos_register_phys(exynos);
	if (ret) {
		dev_err(dev, "couldn't register PHYs\n");
		goto err1;
	}

	clk = devm_clk_get(dev, "usbdrd30");
	if (IS_ERR(clk)) {
		dev_err(dev, "couldn't get clock\n");
		ret = -EINVAL;
		goto err1;
	}

	exynos->dev	= dev;
	exynos->clk	= clk;

	clk_prepare_enable(exynos->clk);

	if (node) {
		ret = of_platform_populate(node, NULL, NULL, dev);
		if (ret) {
			dev_err(dev, "failed to add dwc3 core\n");
			goto err2;
		}
	} else {
		dev_err(dev, "no device node, failed to add dwc3 core\n");
		ret = -ENODEV;
		goto err2;
	}

	return 0;

err2:
	clk_disable_unprepare(clk);
err1:
	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->clk);

	return 0;
}

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

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

	clk_disable(exynos->clk);

	return 0;
}

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

	clk_enable(exynos->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 = of_match_ptr(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");
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	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/kernel.h>
	17	#include <linux/slab.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/platform_data/dwc3-exynos.h>
	20	#include <linux/dma-mapping.h>
d28a9689	21	#include <linux/clk.h>
d720f057 FB	22	#include <linux/usb/otg.h>
d720f057 FB	23	#include <linux/usb/nop-usb-xceiv.h>
accefdd4	24	#include <linux/of.h>
adcf20dc	25	#include <linux/of_platform.h>
d28a9689	26
d28a9689	27	struct dwc3_exynos {
d720f057 FB	28	struct platform_device *usb2_phy;
d720f057 FB	29	struct platform_device *usb3_phy;
d28a9689 AT	30	struct device *dev;
	31
	32	struct clk *clk;
	33	};
	34
41ac7b3a	35	static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
d720f057 FB	36	{
	37	struct nop_usb_xceiv_platform_data pdata;
	38	struct platform_device *pdev;
	39	int ret;
	40
	41	memset(&pdata, 0x00, sizeof(pdata));
	42
b0e45ddb	43	pdev = platform_device_alloc("nop_usb_xceiv", PLATFORM_DEVID_AUTO);
d720f057 FB	44	if (!pdev)
	45	return -ENOMEM;
	46
	47	exynos->usb2_phy = pdev;
	48	pdata.type = USB_PHY_TYPE_USB2;
	49
	50	ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
	51	if (ret)
	52	goto err1;
	53
b0e45ddb	54	pdev = platform_device_alloc("nop_usb_xceiv", PLATFORM_DEVID_AUTO);
d720f057 FB	55	if (!pdev) {
	56	ret = -ENOMEM;
	57	goto err1;
	58	}
	59
	60	exynos->usb3_phy = pdev;
	61	pdata.type = USB_PHY_TYPE_USB3;
	62
	63	ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
	64	if (ret)
	65	goto err2;
	66
	67	ret = platform_device_add(exynos->usb2_phy);
	68	if (ret)
	69	goto err2;
	70
	71	ret = platform_device_add(exynos->usb3_phy);
	72	if (ret)
	73	goto err3;
	74
	75	return 0;
	76
	77	err3:
	78	platform_device_del(exynos->usb2_phy);
	79
	80	err2:
	81	platform_device_put(exynos->usb3_phy);
	82
	83	err1:
	84	platform_device_put(exynos->usb2_phy);
	85
	86	return ret;
	87	}
	88
adcf20dc VG	89	static int dwc3_exynos_remove_child(struct device dev, void unused)
	90	{
	91	struct platform_device *pdev = to_platform_device(dev);
	92
	93	platform_device_unregister(pdev);
	94
	95	return 0;
	96	}
	97
41ac7b3a	98	static int dwc3_exynos_probe(struct platform_device *pdev)
d28a9689	99	{
d28a9689 AT	100	struct dwc3_exynos *exynos;
d28a9689 AT	101	struct clk *clk;
20b97dc1	102	struct device *dev = &pdev->dev;
adcf20dc	103	struct device_node *node = dev->of_node;
d28a9689	104
d28a9689 AT	105	int ret = -ENOMEM;
d28a9689 AT	106
20b97dc1	107	exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
d28a9689	108	if (!exynos) {
20b97dc1	109	dev_err(dev, "not enough memory\n");
adcf20dc	110	goto err1;
d28a9689 AT	111	}
d28a9689 AT	112
accefdd4 VG	113	/*
	114	* Right now device-tree probed devices don't get dma_mask set.
	115	* Since shared usb code relies on it, set it here for now.
	116	* Once we move to full device tree support this will vanish off.
	117	*/
adcf20dc	118	if (!dev->dma_mask)
3b9561e9 SW	119	dev->dma_mask = &dev->coherent_dma_mask;
	120	if (!dev->coherent_dma_mask)
	121	dev->coherent_dma_mask = DMA_BIT_MASK(32);
accefdd4	122
d28a9689 AT	123	platform_set_drvdata(pdev, exynos);
d28a9689 AT	124
d720f057 FB	125	ret = dwc3_exynos_register_phys(exynos);
d720f057 FB	126	if (ret) {
20b97dc1	127	dev_err(dev, "couldn't register PHYs\n");
adcf20dc	128	goto err1;
d28a9689 AT	129	}
d28a9689 AT	130
20b97dc1	131	clk = devm_clk_get(dev, "usbdrd30");
d28a9689	132	if (IS_ERR(clk)) {
20b97dc1	133	dev_err(dev, "couldn't get clock\n");
d28a9689	134	ret = -EINVAL;
20b97dc1	135	goto err1;
d28a9689 AT	136	}
d28a9689 AT	137
20b97dc1	138	exynos->dev = dev;
d28a9689 AT	139	exynos->clk = clk;
d28a9689 AT	140
ddb5147c	141	clk_prepare_enable(exynos->clk);
d28a9689	142
adcf20dc VG	143	if (node) {
	144	ret = of_platform_populate(node, NULL, NULL, dev);
	145	if (ret) {
	146	dev_err(dev, "failed to add dwc3 core\n");
	147	goto err2;
	148	}
	149	} else {
	150	dev_err(dev, "no device node, failed to add dwc3 core\n");
	151	ret = -ENODEV;
20b97dc1	152	goto err2;
d28a9689 AT	153	}
	154
	155	return 0;
	156
20b97dc1	157	err2:
ddb5147c	158	clk_disable_unprepare(clk);
d28a9689	159	err1:
d28a9689 AT	160	return ret;
	161	}
	162
fb4e98ab	163	static int dwc3_exynos_remove(struct platform_device *pdev)
d28a9689 AT	164	{
d28a9689 AT	165	struct dwc3_exynos *exynos = platform_get_drvdata(pdev);
d28a9689	166
022d0547	167	device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
d720f057 FB	168	platform_device_unregister(exynos->usb2_phy);
d720f057 FB	169	platform_device_unregister(exynos->usb3_phy);
d28a9689	170
ddb5147c	171	clk_disable_unprepare(exynos->clk);
d28a9689 AT	172
	173	return 0;
	174	}
	175
accefdd4 VG	176	#ifdef CONFIG_OF
accefdd4 VG	177	static const struct of_device_id exynos_dwc3_match[] = {
fe29db8f	178	{ .compatible = "samsung,exynos5250-dwusb3" },
accefdd4 VG	179	{},
	180	};
	181	MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
	182	#endif
	183
19fda7cd	184	#ifdef CONFIG_PM_SLEEP
0646caf7 VS	185	static int dwc3_exynos_suspend(struct device *dev)
	186	{
	187	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
	188
	189	clk_disable(exynos->clk);
	190
	191	return 0;
	192	}
	193
	194	static int dwc3_exynos_resume(struct device *dev)
	195	{
	196	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
	197
	198	clk_enable(exynos->clk);
	199
	200	/* runtime set active to reflect active state. */
	201	pm_runtime_disable(dev);
	202	pm_runtime_set_active(dev);
	203	pm_runtime_enable(dev);
	204
	205	return 0;
	206	}
	207
	208	static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
	209	SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
	210	};
	211
	212	#define DEV_PM_OPS (&dwc3_exynos_dev_pm_ops)
	213	#else
	214	#define DEV_PM_OPS NULL
19fda7cd	215	#endif /* CONFIG_PM_SLEEP */
0646caf7	216
d28a9689 AT	217	static struct platform_driver dwc3_exynos_driver = {
d28a9689 AT	218	.probe = dwc3_exynos_probe,
7690417d	219	.remove = dwc3_exynos_remove,
d28a9689 AT	220	.driver = {
d28a9689 AT	221	.name = "exynos-dwc3",
accefdd4	222	.of_match_table = of_match_ptr(exynos_dwc3_match),
0646caf7	223	.pm = DEV_PM_OPS,
d28a9689 AT	224	},
	225	};
	226
	227	module_platform_driver(dwc3_exynos_driver);
	228
	229	MODULE_ALIAS("platform:exynos-dwc3");
	230	MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
	231	MODULE_LICENSE("GPL");
	232	MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");