/**
* dwc3_otg_start_host - helper function for starting/stoping the host controller driver.
*
* @otg: Pointer to the otg_transceiver structure.
* @on: start / stop the host controller driver.
*
* Returns 0 on success otherwise negative errno.
*/
static int dwc3_otg_start_host(struct usb_otg *otg, int on)
{
struct dwc3_otg *dotg = container_of(otg, struct dwc3_otg, otg);
struct dwc3_ext_xceiv *ext_xceiv = dotg->ext_xceiv;
struct dwc3 *dwc = dotg->dwc;
int ret = 0;
if (!dwc->xhci)
return -EINVAL;
if (!dotg->vbus_otg) {
dotg->vbus_otg = devm_regulator_get(dwc->dev->parent,
"vbus_dwc3");
if (IS_ERR(dotg->vbus_otg)) {
dev_err(dwc->dev, "Failed to get vbus regulator\n");
ret = PTR_ERR(dotg->vbus_otg);
dotg->vbus_otg = 0;
return ret;
}
}
if (on) {
dev_dbg(otg->phy->dev, "%s: turn on host\n", __func__);
dwc3_otg_notify_host_mode(otg, on);
/* register ocp notification */
if (ext_xceiv && ext_xceiv->otg_capability &&
ext_xceiv->ext_ocp_notification.notify) {
ret = regulator_register_ocp_notification(
dotg->vbus_otg,
&ext_xceiv->ext_ocp_notification);
if (ret)
dev_err(otg->phy->dev,
"unable to register ocp\n");
}
ret = regulator_enable(dotg->vbus_otg);
if (ret) {
dev_err(otg->phy->dev, "unable to enable vbus_otg\n");
dwc3_otg_notify_host_mode(otg, 0);
return ret;
}
/* The delay between enabling regulator and adding the
platform device is needed to succeed in the enumeration
for certain devices. */
usleep(10000);
/*
* This should be revisited for more testing post-silicon.
* In worst case we may need to disconnect the root hub
* before stopping the controller so that it does not
* interfere with runtime pm/system pm.
* We can also consider registering and unregistering xhci
* platform device. It is almost similar to add_hcd and
* remove_hcd, But we may not use standard set_host method
* anymore.
*/
dwc3_otg_set_hsphy_auto_suspend(dotg, true);
dwc3_otg_set_host_regs(dotg);
/*
* FIXME If micro A cable is disconnected during system suspend,
* xhci platform device will be removed before runtime pm is
* enabled for xhci device. Due to this, disable_depth becomes
* greater than one and runtimepm is not enabled for next microA
* connect. Fix this by calling pm_runtime_init for xhci device.
*/
pm_runtime_init(&dwc->xhci->dev);
ret = platform_device_add(dwc->xhci);
if (ret) {
dev_err(otg->phy->dev,
"%s: failed to add XHCI pdev ret=%d\n",
__func__, ret);
regulator_disable(dotg->vbus_otg);
dwc3_otg_notify_host_mode(otg, 0);
return ret;
}
/* re-init OTG EVTEN register as XHCI reset clears it */
if (ext_xceiv && !ext_xceiv->otg_capability)
dwc3_otg_reset(dotg);
} else {
dev_dbg(otg->phy->dev, "%s: turn off host\n", __func__);
ret = regulator_disable(dotg->vbus_otg);
if (ret) {
dev_err(otg->phy->dev, "unable to disable vbus_otg\n");
return ret;
}
/* unregister ocp notification */
if (ext_xceiv && ext_xceiv->otg_capability &&
ext_xceiv->ext_ocp_notification.notify) {
ret = regulator_register_ocp_notification(
dotg->vbus_otg, NULL);
if (ret)
dev_err(otg->phy->dev,
"unable to unregister ocp\n");
}
dwc3_otg_notify_host_mode(otg, on);
platform_device_del(dwc->xhci);
/*
* Perform USB hardware RESET (both core reset and DBM reset)
* when moving from host to peripheral. This is required for
* peripheral mode to work.
*/
if (ext_xceiv && ext_xceiv->otg_capability &&
ext_xceiv->ext_block_reset)
ext_xceiv->ext_block_reset(ext_xceiv, true);
dwc3_otg_set_hsphy_auto_suspend(dotg, false);
dwc3_otg_set_peripheral_regs(dotg);
/* re-init core and OTG registers as block reset clears these */
dwc3_post_host_reset_core_init(dwc);
if (ext_xceiv && !ext_xceiv->otg_capability)
dwc3_otg_reset(dotg);
}
return 0;
}
/**
* dwc3_otg_start_host - helper function for starting/stoping the host controller driver.
*
* @otg: Pointer to the otg_transceiver structure.
* @on: start / stop the host controller driver.
*
* Returns 0 on success otherwise negative errno.
*/
static int dwc3_otg_start_host(struct usb_otg *otg, int on)
{
struct dwc3_otg *dotg = container_of(otg, struct dwc3_otg, otg);
struct dwc3_ext_xceiv *ext_xceiv = dotg->ext_xceiv;
struct dwc3 *dwc = dotg->dwc;
struct usb_hcd *hcd;
int ret = 0;
if (!dwc->xhci)
return -EINVAL;
if (!dotg->vbus_otg) {
dotg->vbus_otg = devm_regulator_get(dwc->dev->parent,
"vbus_dwc3");
if (IS_ERR(dotg->vbus_otg)) {
dev_err(dwc->dev, "Failed to get vbus regulator\n");
ret = PTR_ERR(dotg->vbus_otg);
dotg->vbus_otg = 0;
return ret;
}
}
if (on) {
dev_dbg(otg->phy->dev, "%s: turn on host\n", __func__);
dwc3_otg_notify_host_mode(otg, on);
usb_phy_notify_connect(dotg->dwc->usb2_phy, USB_SPEED_HIGH);
/* register ocp notification */
if (ext_xceiv && ext_xceiv->ext_ocp_notification.notify) {
ret = regulator_register_ocp_notification(
dotg->vbus_otg,
&ext_xceiv->ext_ocp_notification);
if (ret)
dev_err(otg->phy->dev,
"unable to register ocp\n");
}
ret = regulator_enable(dotg->vbus_otg);
if (ret) {
dev_err(otg->phy->dev, "unable to enable vbus_otg\n");
dwc3_otg_notify_host_mode(otg, 0);
return ret;
}
/* The delay between enabling regulator and adding the
platform device is needed to succeed in the enumeration
for certain devices. */
usleep(10000);
dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_HOST);
/*
* FIXME If micro A cable is disconnected during system suspend,
* xhci platform device will be removed before runtime pm is
* enabled for xhci device. Due to this, disable_depth becomes
* greater than one and runtimepm is not enabled for next microA
* connect. Fix this by calling pm_runtime_init for xhci device.
*/
pm_runtime_init(&dwc->xhci->dev);
ret = platform_device_add(dwc->xhci);
if (ret) {
dev_err(otg->phy->dev,
"%s: failed to add XHCI pdev ret=%d\n",
__func__, ret);
regulator_disable(dotg->vbus_otg);
dwc3_otg_notify_host_mode(otg, 0);
return ret;
}
/*
* WORKAROUND: avoids entering a suspend state, because PMIC
* is damaged by known issue when attempt to suspend.
*/
wake_lock(&dotg->host_wakelock);
/*
* WORKAROUND: currently host mode suspend isn't working well.
* Disable xHCI's runtime PM for now.
*/
pm_runtime_disable(&dwc->xhci->dev);
if (no_device_timeout_enable) {
dotg->no_device_timeout_enabled = 1;
dotg->device_count = 0;
dotg->retry_count = 0;
dotg->usbdev_nb.notifier_call = dwc3_usbdev_notify;
usb_register_notify(&dotg->usbdev_nb);
dwc3_otg_start_no_device_work(dotg, true);
}
hcd = platform_get_drvdata(dwc->xhci);
otg->host = &hcd->self;
dwc3_gadget_usb3_phy_suspend(dwc, true);
} else {
dev_dbg(otg->phy->dev, "%s: turn off host\n", __func__);
ret = regulator_disable(dotg->vbus_otg);
if (ret) {
dev_err(otg->phy->dev, "unable to disable vbus_otg\n");
return ret;
}
dbg_event(0xFF, "StHost get", 0);
/* unregister ocp notification */
if (ext_xceiv && ext_xceiv->ext_ocp_notification.notify) {
ret = regulator_register_ocp_notification(
dotg->vbus_otg, NULL);
if (ret)
dev_err(otg->phy->dev,
"unable to unregister ocp\n");
}
pm_runtime_get(dwc->dev);
usb_phy_notify_disconnect(dotg->dwc->usb2_phy, USB_SPEED_HIGH);
dwc3_otg_notify_host_mode(otg, on);
otg->host = NULL;
if (dotg->no_device_timeout_enabled) {
dotg->no_device_timeout_enabled = 0;
dwc3_otg_start_no_device_work(dotg, false);
usb_unregister_notify(&dotg->usbdev_nb);
}
platform_device_del(dwc->xhci);
/* WORKAROUND: delays execution of the block-reset because it
* causes HWWD if ext_xceive access the HW during block reset.
*/
usleep(10000);
if (wake_lock_active(&dotg->host_wakelock))
wake_unlock(&dotg->host_wakelock);
/*
* Perform USB hardware RESET (both core reset and DBM reset)
* when moving from host to peripheral. This is required for
* peripheral mode to work.
*/
if (ext_xceiv && ext_xceiv->ext_block_reset)
ext_xceiv->ext_block_reset(ext_xceiv, true);
dwc3_gadget_usb3_phy_suspend(dwc, false);
dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
/* re-init core and OTG registers as block reset clears these */
dwc3_post_host_reset_core_init(dwc);
dbg_event(0xFF, "StHost put", 0);
pm_runtime_put(dwc->dev);
}
return 0;
}
