[thirdparty/u-boot.git] / drivers / phy / keystone-usb-phy.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2017 Texas Instruments Incorporated - https://www.ti.com/
 * Written by Jean-Jacques Hiblot  <jjhiblot@ti.com>
 */

#include <common.h>
#include <dm.h>
#include <log.h>
#include <dm/device.h>
#include <generic-phy.h>
#include <asm/io.h>
#include <asm/arch/psc_defs.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/printk.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_OTG_VBUSVLDECTSEL		BIT(16)
#define PHY_REF_SSP_EN			BIT(29)

struct keystone_usb_phy {
	u32 psc_domain;
	void __iomem *reg;
};

static int keystone_usb_init(struct phy *phy)
{
	u32 val;
	int rc;
	struct udevice *dev = phy->dev;
	struct keystone_usb_phy *keystone = dev_get_priv(dev);

	/* Release USB from reset */
	rc = psc_enable_module(keystone->psc_domain);
	if (rc) {
		debug("Cannot enable USB module");
		return -rc;
	}
	mdelay(10);

	/*
	 * VBUSVLDEXTSEL has a default value of 1 in BootCfg but shouldn't.
	 * It should always be cleared because our USB PHY has an onchip VBUS
	 * analog comparator.
	 */
	val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
	/* quit selecting the vbusvldextsel by default! */
	val &= ~PHY_OTG_VBUSVLDECTSEL;
	writel(val, keystone->reg + USB_PHY_CTL_CLOCK);

	return 0;
}

static int keystone_usb_power_on(struct phy *phy)
{
	u32 val;
	struct udevice *dev = phy->dev;
	struct keystone_usb_phy *keystone = dev_get_priv(dev);

	val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
	val |= PHY_REF_SSP_EN;
	writel(val, keystone->reg + USB_PHY_CTL_CLOCK);

	return 0;
}

static int keystone_usb_power_off(struct phy *phy)
{
	u32 val;
	struct udevice *dev = phy->dev;
	struct keystone_usb_phy *keystone = dev_get_priv(dev);

	val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
	val &= ~PHY_REF_SSP_EN;
	writel(val, keystone->reg + USB_PHY_CTL_CLOCK);

	return 0;
}

static int keystone_usb_exit(struct phy *phy)
{
	struct udevice *dev = phy->dev;
	struct keystone_usb_phy *keystone = dev_get_priv(dev);

	if (psc_disable_module(keystone->psc_domain))
		debug("failed to disable USB module!\n");

	return 0;
}

static int keystone_usb_phy_probe(struct udevice *dev)
{
	int rc;
	struct keystone_usb_phy *keystone = dev_get_priv(dev);

	rc = dev_read_u32(dev, "psc-domain", &keystone->psc_domain);
	if (rc)
		return rc;

	keystone->reg = dev_remap_addr_index(dev, 0);
	if (!keystone->reg) {
		pr_err("unable to remap usb phy\n");
		return -EINVAL;
	}
	return 0;
}

static const struct udevice_id keystone_usb_phy_ids[] = {
	{ .compatible = "ti,keystone-usbphy" },
	{ }
};

static struct phy_ops keystone_usb_phy_ops = {
	.init = keystone_usb_init,
	.power_on = keystone_usb_power_on,
	.power_off = keystone_usb_power_off,
	.exit = keystone_usb_exit,
};

U_BOOT_DRIVER(keystone_usb_phy) = {
	.name	= "keystone_usb_phy",
	.id	= UCLASS_PHY,
	.of_match = keystone_usb_phy_ids,
	.ops = &keystone_usb_phy_ops,
	.probe = keystone_usb_phy_probe,
	.priv_auto	= sizeof(struct keystone_usb_phy),
};
Commit	Line	Data
4b12783c JJH	1	// SPDX-License-Identifier: GPL-2.0+
4b12783c JJH	2	/*
a94a4071	3	* Copyright (C) 2017 Texas Instruments Incorporated - https://www.ti.com/
4b12783c JJH	4	* Written by Jean-Jacques Hiblot <jjhiblot@ti.com>
	5	*/
	6
d678a59d	7	#include <common.h>
4b12783c	8	#include <dm.h>
f7ae49fc	9	#include <log.h>
4b12783c JJH	10	#include <dm/device.h>
	11	#include <generic-phy.h>
	12	#include <asm/io.h>
2bbc1bbf	13	#include <asm/arch/psc_defs.h>
cd93d625	14	#include <linux/bitops.h>
c05ed00a	15	#include <linux/delay.h>
1e94b46f	16	#include <linux/printk.h>
4b12783c JJH	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_OTG_VBUSVLDECTSEL BIT(16)
	27	#define PHY_REF_SSP_EN BIT(29)
	28
	29	struct keystone_usb_phy {
2bbc1bbf	30	u32 psc_domain;
4b12783c JJH	31	void __iomem *reg;
	32	};
	33
	34	static int keystone_usb_init(struct phy *phy)
	35	{
	36	u32 val;
2bbc1bbf	37	int rc;
4b12783c JJH	38	struct udevice *dev = phy->dev;
	39	struct keystone_usb_phy *keystone = dev_get_priv(dev);
	40
2bbc1bbf JJH	41	/* Release USB from reset */
	42	rc = psc_enable_module(keystone->psc_domain);
	43	if (rc) {
	44	debug("Cannot enable USB module");
	45	return -rc;
	46	}
	47	mdelay(10);
	48
4b12783c JJH	49	/*
	50	* VBUSVLDEXTSEL has a default value of 1 in BootCfg but shouldn't.
	51	* It should always be cleared because our USB PHY has an onchip VBUS
	52	* analog comparator.
	53	*/
	54	val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
	55	/* quit selecting the vbusvldextsel by default! */
	56	val &= ~PHY_OTG_VBUSVLDECTSEL;
	57	writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
	58
	59	return 0;
	60	}
	61
	62	static int keystone_usb_power_on(struct phy *phy)
	63	{
	64	u32 val;
	65	struct udevice *dev = phy->dev;
	66	struct keystone_usb_phy *keystone = dev_get_priv(dev);
	67
	68	val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
	69	val \|= PHY_REF_SSP_EN;
	70	writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
	71
	72	return 0;
	73	}
	74
	75	static int keystone_usb_power_off(struct phy *phy)
	76	{
	77	u32 val;
	78	struct udevice *dev = phy->dev;
	79	struct keystone_usb_phy *keystone = dev_get_priv(dev);
	80
	81	val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
	82	val &= ~PHY_REF_SSP_EN;
	83	writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
	84
	85	return 0;
	86	}
	87
	88	static int keystone_usb_exit(struct phy *phy)
	89	{
2bbc1bbf JJH	90	struct udevice *dev = phy->dev;
	91	struct keystone_usb_phy *keystone = dev_get_priv(dev);
	92
	93	if (psc_disable_module(keystone->psc_domain))
	94	debug("failed to disable USB module!\n");
	95
4b12783c JJH	96	return 0;
	97	}
	98
	99	static int keystone_usb_phy_probe(struct udevice *dev)
	100	{
2bbc1bbf	101	int rc;
4b12783c JJH	102	struct keystone_usb_phy *keystone = dev_get_priv(dev);
4b12783c JJH	103
2bbc1bbf JJH	104	rc = dev_read_u32(dev, "psc-domain", &keystone->psc_domain);
	105	if (rc)
	106	return rc;
	107
4b12783c JJH	108	keystone->reg = dev_remap_addr_index(dev, 0);
	109	if (!keystone->reg) {
	110	pr_err("unable to remap usb phy\n");
	111	return -EINVAL;
	112	}
	113	return 0;
	114	}
	115
	116	static const struct udevice_id keystone_usb_phy_ids[] = {
	117	{ .compatible = "ti,keystone-usbphy" },
	118	{ }
	119	};
	120
	121	static struct phy_ops keystone_usb_phy_ops = {
	122	.init = keystone_usb_init,
	123	.power_on = keystone_usb_power_on,
	124	.power_off = keystone_usb_power_off,
	125	.exit = keystone_usb_exit,
	126	};
	127
	128	U_BOOT_DRIVER(keystone_usb_phy) = {
	129	.name = "keystone_usb_phy",
	130	.id = UCLASS_PHY,
	131	.of_match = keystone_usb_phy_ids,
	132	.ops = &keystone_usb_phy_ops,
	133	.probe = keystone_usb_phy_probe,
41575d8e	134	.priv_auto = sizeof(struct keystone_usb_phy),
4b12783c	135	};