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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 Texas Instruments Incorporated - http://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>
/* 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),
};
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