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authorNagarjuna Kristam <nkristam@nvidia.com>2020-02-10 13:41:33 +0530
committerThierry Reding <treding@nvidia.com>2020-03-19 13:59:46 +0100
commit49d46e3c7e597e8b00c6fc16e6fd7a92044f4371 (patch)
treefdbc936162556aa240f45216fed179b32e7b3d3b /drivers/phy/tegra/xusb-tegra186.c
parentde792a6da7f026a5aa047ee62a0fafb1e5d0e6ed (diff)
downloadlwn-49d46e3c7e597e8b00c6fc16e6fd7a92044f4371.tar.gz
lwn-49d46e3c7e597e8b00c6fc16e6fd7a92044f4371.zip
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>
Diffstat (limited to 'drivers/phy/tegra/xusb-tegra186.c')
-rw-r--r--drivers/phy/tegra/xusb-tegra186.c114
1 files changed, 92 insertions, 22 deletions
diff --git a/drivers/phy/tegra/xusb-tegra186.c b/drivers/phy/tegra/xusb-tegra186.c
index 84c27394c181..ea62251671d7 100644
--- 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,