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

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>

diff --git a/drivers/phy/tegra/xusb-tegra186.c b/drivers/phy/tegra/xusb-tegra186.c
index 84c27394c181db5ec976d439f083d5ca4bdb6e11..ea62251671d727a85ae5a3f328f5b29ca2e67a83 100644 (file)
--- a/drivers/phy/tegra/xusb-tegra186.c
+++ b/drivers/phy/tegra/xusb-tegra186.c
@@ -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,