[linux-2.6-block.git] / drivers / usb / phy / phy-keystone.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * phy-keystone - USB PHY, talking to dwc3 controller in Keystone.
 *
 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
 *
 * Author: WingMan Kwok <w-kwok2@ti.com>
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/usb/usb_phy_generic.h>
#include <linux/io.h>
#include <linux/of.h>

#include "phy-generic.h"

/* USB PHY control register offsets */
#define USB_PHY_CTL_UTMI		0x0000
#define USB_PHY_CTL_PIPE		0x0004
#define USB_PHY_CTL_PARAM_1		0x0008
#define USB_PHY_CTL_PARAM_2		0x000c
#define USB_PHY_CTL_CLOCK		0x0010
#define USB_PHY_CTL_PLL			0x0014

#define PHY_REF_SSP_EN			BIT(29)

struct keystone_usbphy {
	struct usb_phy_generic	usb_phy_gen;
	void __iomem			*phy_ctrl;
};

static inline u32 keystone_usbphy_readl(void __iomem *base, u32 offset)
{
	return readl(base + offset);
}

static inline void keystone_usbphy_writel(void __iomem *base,
					  u32 offset, u32 value)
{
	writel(value, base + offset);
}

static int keystone_usbphy_init(struct usb_phy *phy)
{
	struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev);
	u32 val;

	val  = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK);
	keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK,
				val | PHY_REF_SSP_EN);
	return 0;
}

static void keystone_usbphy_shutdown(struct usb_phy *phy)
{
	struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev);
	u32 val;

	val  = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK);
	keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK,
				val &= ~PHY_REF_SSP_EN);
}

static int keystone_usbphy_probe(struct platform_device *pdev)
{
	struct device		*dev = &pdev->dev;
	struct keystone_usbphy	*k_phy;
	struct resource		*res;
	int ret;

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

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	k_phy->phy_ctrl = devm_ioremap_resource(dev, res);
	if (IS_ERR(k_phy->phy_ctrl))
		return PTR_ERR(k_phy->phy_ctrl);

	ret = usb_phy_gen_create_phy(dev, &k_phy->usb_phy_gen, NULL);
	if (ret)
		return ret;

	k_phy->usb_phy_gen.phy.init = keystone_usbphy_init;
	k_phy->usb_phy_gen.phy.shutdown = keystone_usbphy_shutdown;

	platform_set_drvdata(pdev, k_phy);

	return usb_add_phy_dev(&k_phy->usb_phy_gen.phy);
}

static int keystone_usbphy_remove(struct platform_device *pdev)
{
	struct keystone_usbphy *k_phy = platform_get_drvdata(pdev);

	usb_remove_phy(&k_phy->usb_phy_gen.phy);

	return 0;
}

static const struct of_device_id keystone_usbphy_ids[] = {
	{ .compatible = "ti,keystone-usbphy" },
	{ }
};
MODULE_DEVICE_TABLE(of, keystone_usbphy_ids);

static struct platform_driver keystone_usbphy_driver = {
	.probe          = keystone_usbphy_probe,
	.remove         = keystone_usbphy_remove,
	.driver         = {
		.name   = "keystone-usbphy",
		.of_match_table = keystone_usbphy_ids,
	},
};

module_platform_driver(keystone_usbphy_driver);

MODULE_ALIAS("platform:keystone-usbphy");
MODULE_AUTHOR("Texas Instruments Inc.");
MODULE_DESCRIPTION("Keystone USB phy driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
5fd54ace	1	// SPDX-License-Identifier: GPL-2.0+
25acdd08 WK	2	/*
	3	* phy-keystone - USB PHY, talking to dwc3 controller in Keystone.
	4	*
	5	* Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
25acdd08 WK	6	*
25acdd08 WK	7	* Author: WingMan Kwok <w-kwok2@ti.com>
25acdd08 WK	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/platform_device.h>
d7078df6	12	#include <linux/usb/usb_phy_generic.h>
25acdd08 WK	13	#include <linux/io.h>
	14	#include <linux/of.h>
	15
	16	#include "phy-generic.h"
	17
	18	/* USB PHY control register offsets */
	19	#define USB_PHY_CTL_UTMI 0x0000
	20	#define USB_PHY_CTL_PIPE 0x0004
	21	#define USB_PHY_CTL_PARAM_1 0x0008
	22	#define USB_PHY_CTL_PARAM_2 0x000c
	23	#define USB_PHY_CTL_CLOCK 0x0010
	24	#define USB_PHY_CTL_PLL 0x0014
	25
	26	#define PHY_REF_SSP_EN BIT(29)
	27
	28	struct keystone_usbphy {
4525beeb	29	struct usb_phy_generic usb_phy_gen;
25acdd08 WK	30	void __iomem *phy_ctrl;
	31	};
	32
	33	static inline u32 keystone_usbphy_readl(void __iomem *base, u32 offset)
	34	{
	35	return readl(base + offset);
	36	}
	37
	38	static inline void keystone_usbphy_writel(void __iomem *base,
	39	u32 offset, u32 value)
	40	{
	41	writel(value, base + offset);
	42	}
	43
	44	static int keystone_usbphy_init(struct usb_phy *phy)
	45	{
	46	struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev);
	47	u32 val;
	48
	49	val = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK);
	50	keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK,
	51	val \| PHY_REF_SSP_EN);
	52	return 0;
	53	}
	54
	55	static void keystone_usbphy_shutdown(struct usb_phy *phy)
	56	{
	57	struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev);
	58	u32 val;
	59
	60	val = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK);
	61	keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK,
	62	val &= ~PHY_REF_SSP_EN);
	63	}
	64
	65	static int keystone_usbphy_probe(struct platform_device *pdev)
	66	{
	67	struct device *dev = &pdev->dev;
	68	struct keystone_usbphy *k_phy;
	69	struct resource *res;
	70	int ret;
	71
	72	k_phy = devm_kzalloc(dev, sizeof(*k_phy), GFP_KERNEL);
	73	if (!k_phy)
	74	return -ENOMEM;
	75
	76	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
25acdd08 WK	77	k_phy->phy_ctrl = devm_ioremap_resource(dev, res);
	78	if (IS_ERR(k_phy->phy_ctrl))
	79	return PTR_ERR(k_phy->phy_ctrl);
	80
c139e142	81	ret = usb_phy_gen_create_phy(dev, &k_phy->usb_phy_gen, NULL);
25acdd08 WK	82	if (ret)
	83	return ret;
	84
	85	k_phy->usb_phy_gen.phy.init = keystone_usbphy_init;
	86	k_phy->usb_phy_gen.phy.shutdown = keystone_usbphy_shutdown;
	87
	88	platform_set_drvdata(pdev, k_phy);
	89
a9c5d8fe	90	return usb_add_phy_dev(&k_phy->usb_phy_gen.phy);
25acdd08 WK	91	}
	92
	93	static int keystone_usbphy_remove(struct platform_device *pdev)
	94	{
	95	struct keystone_usbphy *k_phy = platform_get_drvdata(pdev);
	96
	97	usb_remove_phy(&k_phy->usb_phy_gen.phy);
	98
	99	return 0;
	100	}
	101
	102	static const struct of_device_id keystone_usbphy_ids[] = {
	103	{ .compatible = "ti,keystone-usbphy" },
	104	{ }
	105	};
	106	MODULE_DEVICE_TABLE(of, keystone_usbphy_ids);
	107
	108	static struct platform_driver keystone_usbphy_driver = {
	109	.probe = keystone_usbphy_probe,
	110	.remove = keystone_usbphy_remove,
	111	.driver = {
	112	.name = "keystone-usbphy",
ed40082d	113	.of_match_table = keystone_usbphy_ids,
25acdd08 WK	114	},
	115	};
	116
	117	module_platform_driver(keystone_usbphy_driver);
	118
	119	MODULE_ALIAS("platform:keystone-usbphy");
	120	MODULE_AUTHOR("Texas Instruments Inc.");
	121	MODULE_DESCRIPTION("Keystone USB phy driver");
	122	MODULE_LICENSE("GPL v2");