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// SPDX-License-Identifier: GPL-2.0+
/*
* OMAP USB2 PHY LAYER
*
* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com
* Written by Jean-Jacques Hiblot <jjhiblot@ti.com>
*/
#include <common.h>
#include <asm/io.h>
#include <dm.h>
#include <errno.h>
#include <generic-phy.h>
#include <regmap.h>
#include <syscon.h>
#define OMAP_USB2_CALIBRATE_FALSE_DISCONNECT BIT(0)
#define OMAP_DEV_PHY_PD BIT(0)
#define OMAP_USB2_PHY_PD BIT(28)
#define AM437X_USB2_PHY_PD BIT(0)
#define AM437X_USB2_OTG_PD BIT(1)
#define AM437X_USB2_OTGVDET_EN BIT(19)
#define AM437X_USB2_OTGSESSEND_EN BIT(20)
#define USB2PHY_DISCON_BYP_LATCH BIT(31)
#define USB2PHY_ANA_CONFIG1 (0x4c)
DECLARE_GLOBAL_DATA_PTR;
struct omap_usb2_phy {
struct regmap *pwr_regmap;
ulong flags;
void *phy_base;
u32 pwr_reg_offset;
};
struct usb_phy_data {
const char *label;
u8 flags;
u32 mask;
u32 power_on;
u32 power_off;
};
static const struct usb_phy_data omap5_usb2_data = {
.label = "omap5_usb2",
.flags = 0,
.mask = OMAP_DEV_PHY_PD,
.power_off = OMAP_DEV_PHY_PD,
};
static const struct usb_phy_data dra7x_usb2_data = {
.label = "dra7x_usb2",
.flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
.mask = OMAP_DEV_PHY_PD,
.power_off = OMAP_DEV_PHY_PD,
};
static const struct usb_phy_data dra7x_usb2_phy2_data = {
.label = "dra7x_usb2_phy2",
.flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
.mask = OMAP_USB2_PHY_PD,
.power_off = OMAP_USB2_PHY_PD,
};
static const struct usb_phy_data am437x_usb2_data = {
.label = "am437x_usb2",
.flags = 0,
.mask = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD |
AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
.power_on = AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
.power_off = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD,
};
static const struct udevice_id omap_usb2_id_table[] = {
{
.compatible = "ti,omap5-usb2",
.data = (ulong)&omap5_usb2_data,
},
{
.compatible = "ti,dra7x-usb2",
.data = (ulong)&dra7x_usb2_data,
},
{
.compatible = "ti,dra7x-usb2-phy2",
.data = (ulong)&dra7x_usb2_phy2_data,
},
{
.compatible = "ti,am437x-usb2",
.data = (ulong)&am437x_usb2_data,
},
{},
};
static int omap_usb_phy_power(struct phy *usb_phy, bool on)
{
struct udevice *dev = usb_phy->dev;
const struct usb_phy_data *data;
const struct omap_usb2_phy *phy = dev_get_priv(dev);
u32 val;
int rc;
data = (const struct usb_phy_data *)dev_get_driver_data(dev);
if (!data)
return -EINVAL;
rc = regmap_read(phy->pwr_regmap, phy->pwr_reg_offset, &val);
if (rc)
return rc;
val &= ~data->mask;
if (on)
val |= data->power_on;
else
val |= data->power_off;
rc = regmap_write(phy->pwr_regmap, phy->pwr_reg_offset, val);
if (rc)
return rc;
return 0;
}
static int omap_usb2_phy_init(struct phy *usb_phy)
{
struct udevice *dev = usb_phy->dev;
struct omap_usb2_phy *priv = dev_get_priv(dev);
u32 val;
if (priv->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
/*
*
* Reduce the sensitivity of internal PHY by enabling the
* DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This
* resolves issues with certain devices which can otherwise
* be prone to false disconnects.
*
*/
val = readl(priv->phy_base + USB2PHY_ANA_CONFIG1);
val |= USB2PHY_DISCON_BYP_LATCH;
writel(val, priv->phy_base + USB2PHY_ANA_CONFIG1);
}
return 0;
}
static int omap_usb2_phy_power_on(struct phy *usb_phy)
{
return omap_usb_phy_power(usb_phy, true);
}
static int omap_usb2_phy_power_off(struct phy *usb_phy)
{
return omap_usb_phy_power(usb_phy, false);
}
static int omap_usb2_phy_exit(struct phy *usb_phy)
{
return omap_usb_phy_power(usb_phy, false);
}
struct phy_ops omap_usb2_phy_ops = {
.init = omap_usb2_phy_init,
.power_on = omap_usb2_phy_power_on,
.power_off = omap_usb2_phy_power_off,
.exit = omap_usb2_phy_exit,
};
int omap_usb2_phy_probe(struct udevice *dev)
{
int rc;
struct regmap *regmap;
struct omap_usb2_phy *priv = dev_get_priv(dev);
const struct usb_phy_data *data;
u32 tmp[2];
data = (const struct usb_phy_data *)dev_get_driver_data(dev);
if (!data)
return -EINVAL;
if (data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
u32 base = dev_read_addr(dev);
if (base == FDT_ADDR_T_NONE)
return -EINVAL;
priv->phy_base = (void *)base;
priv->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
}
regmap = syscon_regmap_lookup_by_phandle(dev, "syscon-phy-power");
if (!IS_ERR(regmap)) {
priv->pwr_regmap = regmap;
rc = dev_read_u32_array(dev, "syscon-phy-power", tmp, 2);
if (rc) {
printf("couldn't get power reg. offset (err %d)\n", rc);
return rc;
}
priv->pwr_reg_offset = tmp[1];
return 0;
}
regmap = syscon_regmap_lookup_by_phandle(dev, "ctrl-module");
if (!IS_ERR(regmap)) {
priv->pwr_regmap = regmap;
priv->pwr_reg_offset = 0;
return 0;
}
printf("can't get regmap (err %ld)\n", PTR_ERR(regmap));
return PTR_ERR(regmap);
}
U_BOOT_DRIVER(omap_usb2_phy) = {
.name = "omap_usb2_phy",
.id = UCLASS_PHY,
.of_match = omap_usb2_id_table,
.probe = omap_usb2_phy_probe,
.ops = &omap_usb2_phy_ops,
.priv_auto_alloc_size = sizeof(struct omap_usb2_phy),
};
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