phy: tegra: xusb: Add vbus override support on Tegra210

Tegra XUSB device control driver needs to control vbus override
during its operations, add API for the support.
Signed-off-by: Nagarjuna Kristam <nkristam@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

drivers/phy/tegra/xusb-tegra210.c

@@ -65,6 +65,10 @@
 #define XUSB_PADCTL_USB3_PAD_MUX_PCIE_IDDQ_DISABLE(x) (1 << (1 + (x)))
 #define XUSB_PADCTL_USB3_PAD_MUX_SATA_IDDQ_DISABLE(x) (1 << (8 + (x)))
 
+#define XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPADX_CTL0(x) (0x080 + (x) * 0x40)
+#define XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPAD_CTL0_ZIP (1 << 18)
+#define XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPAD_CTL0_ZIN (1 << 22)
+
 #define XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPADX_CTL1(x) (0x084 + (x) * 0x40)
 #define XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPAD_CTL1_VREG_LEV_SHIFT 7
 #define XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPAD_CTL1_VREG_LEV_MASK 0x3
@@ -227,6 +231,12 @@
 #define XUSB_PADCTL_UPHY_USB3_PADX_ECTL6(x) (0xa74 + (x) * 0x40)
 #define XUSB_PADCTL_UPHY_USB3_PAD_ECTL6_RX_EQ_CTRL_H_VAL 0xfcf01368
 
+#define XUSB_PADCTL_USB2_VBUS_ID 0xc60
+#define XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_VBUS_ON (1 << 14)
+#define XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_SHIFT 18
+#define XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_MASK 0xf
+#define XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_FLOATING 8
+
 struct tegra210_xusb_fuse_calibration {
 	u32 hs_curr_level[4];
 	u32 hs_term_range_adj;
@@ -2013,6 +2023,52 @@ static const struct tegra_xusb_port_ops tegra210_usb3_port_ops = {
 	.map = tegra210_usb3_port_map,
 };
 
+static int tegra210_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, XUSB_PADCTL_USB2_VBUS_ID);
+
+	if (status) {
+		value |= XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_VBUS_ON;
+		value &= ~(XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_MASK <<
+			   XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_SHIFT);
+		value |= XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_FLOATING <<
+			 XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_SHIFT;
+	} else {
+		value &= ~XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_VBUS_ON;
+	}
+
+	padctl_writel(padctl, value, XUSB_PADCTL_USB2_VBUS_ID);
+
+	return 0;
+}
+
+static int tegra210_utmi_port_reset(struct phy *phy)
+{
+	struct tegra_xusb_padctl *padctl;
+	struct tegra_xusb_lane *lane;
+	u32 value;
+
+	lane = phy_get_drvdata(phy);
+	padctl = lane->pad->padctl;
+
+	value = padctl_readl(padctl,
+		     XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPADX_CTL0(lane->index));
+
+	if ((value & XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPAD_CTL0_ZIP) ||
+	    (value & XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPAD_CTL0_ZIN)) {
+		tegra210_xusb_padctl_vbus_override(padctl, false);
+		tegra210_xusb_padctl_vbus_override(padctl, true);
+		return 1;
+	}
+
+	return 0;
+}
+
 static int
 tegra210_xusb_read_fuse_calibration(struct tegra210_xusb_fuse_calibration *fuse)
 {
@@ -2075,6 +2131,8 @@ static const struct tegra_xusb_padctl_ops tegra210_xusb_padctl_ops = {
 	.remove = tegra210_xusb_padctl_remove,
 	.usb3_set_lfps_detect = tegra210_usb3_set_lfps_detect,
 	.hsic_set_idle = tegra210_hsic_set_idle,
+	.vbus_override = tegra210_xusb_padctl_vbus_override,
+	.utmi_port_reset = tegra210_utmi_port_reset,
 };
 
 static const char * const tegra210_xusb_padctl_supply_names[] = {

drivers/phy/tegra/xusb.c

@@ -1121,6 +1121,28 @@ int tegra_xusb_padctl_usb3_set_lfps_detect(struct tegra_xusb_padctl *padctl,
 }
 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_set_lfps_detect);
 
+int tegra_xusb_padctl_set_vbus_override(struct tegra_xusb_padctl *padctl,
+							bool val)
+{
+	if (padctl->soc->ops->vbus_override)
+		return padctl->soc->ops->vbus_override(padctl, val);
+
+	return -ENOTSUPP;
+}
+EXPORT_SYMBOL_GPL(tegra_xusb_padctl_set_vbus_override);
+
+int tegra_phy_xusb_utmi_port_reset(struct phy *phy)
+{
+	struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
+	struct tegra_xusb_padctl *padctl = lane->pad->padctl;
+
+	if (padctl->soc->ops->utmi_port_reset)
+		return padctl->soc->ops->utmi_port_reset(phy);
+
+	return -ENOTSUPP;
+}
+EXPORT_SYMBOL_GPL(tegra_phy_xusb_utmi_port_reset);
+
 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
 MODULE_DESCRIPTION("Tegra XUSB Pad Controller driver");
 MODULE_LICENSE("GPL v2");

drivers/phy/tegra/xusb.h

@@ -373,6 +373,8 @@ struct tegra_xusb_padctl_ops {
 			     unsigned int index, bool idle);
 	int (*usb3_set_lfps_detect)(struct tegra_xusb_padctl *padctl,
 				    unsigned int index, bool enable);
+	int (*vbus_override)(struct tegra_xusb_padctl *padctl, bool set);
+	int (*utmi_port_reset)(struct phy *phy);
 };
 
 struct tegra_xusb_padctl_soc {

include/linux/phy/tegra/xusb.h

@@ -18,5 +18,7 @@ int tegra_xusb_padctl_hsic_set_idle(struct tegra_xusb_padctl *padctl,
 				    unsigned int port, bool idle);
 int tegra_xusb_padctl_usb3_set_lfps_detect(struct tegra_xusb_padctl *padctl,
 					   unsigned int port, bool enable);
-
+int tegra_xusb_padctl_set_vbus_override(struct tegra_xusb_padctl *padctl,
+					bool val);
+int tegra_phy_xusb_utmi_port_reset(struct phy *phy);
 #endif /* PHY_TEGRA_XUSB_H */