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phy: tegra: xusb: Add set_mode support for UTMI phy on Tegra186

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Add support for set_mode on UTMI phy. This allow XUSB host/device mode
drivers to configure the hardware to corresponding modes.

Signed-off-by: Nagarjuna Kristam <nkristam@nvidia.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Nagarjuna Kristam 2020-02-10 13:41:33 +05:30 committed by Thierry Reding
parent de792a6da7
commit 49d46e3c7e
1 changed files with 92 additions and 22 deletions
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114
drivers/phy/tegra/xusb-tegra186.c
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@ -301,6 +301,97 @@ static void tegra_phy_xusb_utmi_pad_power_down(struct phy *phy)
tegra186_utmi_bias_pad_power_off(padctl);
}
static int tegra186_xusb_padctl_vbus_override(struct tegra_xusb_padctl *padctl,
bool status)
{
u32 value;
dev_dbg(padctl->dev, "%s vbus override\n", status ? "set" : "clear");
value = padctl_readl(padctl, USB2_VBUS_ID);
if (status) {
value |= VBUS_OVERRIDE;
value &= ~ID_OVERRIDE(~0);
value |= ID_OVERRIDE_FLOATING;
} else {
value &= ~VBUS_OVERRIDE;
}
padctl_writel(padctl, value, USB2_VBUS_ID);
return 0;
}
static int tegra186_xusb_padctl_id_override(struct tegra_xusb_padctl *padctl,
bool status)
{
u32 value;
dev_dbg(padctl->dev, "%s id override\n", status ? "set" : "clear");
value = padctl_readl(padctl, USB2_VBUS_ID);
if (status) {
if (value & VBUS_OVERRIDE) {
value &= ~VBUS_OVERRIDE;
padctl_writel(padctl, value, USB2_VBUS_ID);
usleep_range(1000, 2000);
value = padctl_readl(padctl, USB2_VBUS_ID);
}
value &= ~ID_OVERRIDE(~0);
value |= ID_OVERRIDE_GROUNDED;
} else {
value &= ~ID_OVERRIDE(~0);
value |= ID_OVERRIDE_FLOATING;
}
padctl_writel(padctl, value, USB2_VBUS_ID);
return 0;
}
static int tegra186_utmi_phy_set_mode(struct phy *phy, enum phy_mode mode,
int submode)
{
struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
struct tegra_xusb_padctl *padctl = lane->pad->padctl;
struct tegra_xusb_usb2_port *port = tegra_xusb_find_usb2_port(padctl,
lane->index);
int err = 0;
mutex_lock(&padctl->lock);
dev_dbg(&port->base.dev, "%s: mode %d", __func__, mode);
if (mode == PHY_MODE_USB_OTG) {
if (submode == USB_ROLE_HOST) {
tegra186_xusb_padctl_id_override(padctl, true);
err = regulator_enable(port->supply);
} else if (submode == USB_ROLE_DEVICE) {
tegra186_xusb_padctl_vbus_override(padctl, true);
} else if (submode == USB_ROLE_NONE) {
/*
* When port is peripheral only or role transitions to
* USB_ROLE_NONE from USB_ROLE_DEVICE, regulator is not
* enabled.
*/
if (regulator_is_enabled(port->supply))
regulator_disable(port->supply);
tegra186_xusb_padctl_id_override(padctl, false);
tegra186_xusb_padctl_vbus_override(padctl, false);
}
}
mutex_unlock(&padctl->lock);
return err;
}
static int tegra186_utmi_phy_power_on(struct phy *phy)
{
struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
@ -439,6 +530,7 @@ static const struct phy_ops utmi_phy_ops = {
.exit = tegra186_utmi_phy_exit,
.power_on = tegra186_utmi_phy_power_on,
.power_off = tegra186_utmi_phy_power_off,
.set_mode = tegra186_utmi_phy_set_mode,
.owner = THIS_MODULE,
};
@ -857,28 +949,6 @@ static void tegra186_xusb_padctl_remove(struct tegra_xusb_padctl *padctl)
{
}
static int tegra186_xusb_padctl_vbus_override(struct tegra_xusb_padctl *padctl,
bool status)
{
u32 value;
dev_dbg(padctl->dev, "%s vbus override\n", status ? "set" : "clear");
value = padctl_readl(padctl, USB2_VBUS_ID);
if (status) {
value |= VBUS_OVERRIDE;
value &= ~ID_OVERRIDE(~0);
value |= ID_OVERRIDE_FLOATING;
} else {
value &= ~VBUS_OVERRIDE;
}
padctl_writel(padctl, value, USB2_VBUS_ID);
return 0;
}
static const struct tegra_xusb_padctl_ops tegra186_xusb_padctl_ops = {
.probe = tegra186_xusb_padctl_probe,
.remove = tegra186_xusb_padctl_remove,