usb: dwc3: add ULPI interface support
Registers DWC3's ULPI interface with the ULPI bus when it's
available.
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: David Cohen <david.a.cohen@linux.intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 0de8968..5c110d8 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -394,10 +394,15 @@
/**
* dwc3_phy_setup - Configure USB PHY Interface of DWC3 Core
* @dwc: Pointer to our controller context structure
+ *
+ * Returns 0 on success. The USB PHY interfaces are configured but not
+ * initialized. The PHY interfaces and the PHYs get initialized together with
+ * the core in dwc3_core_init.
*/
-static void dwc3_phy_setup(struct dwc3 *dwc)
+static int dwc3_phy_setup(struct dwc3 *dwc)
{
u32 reg;
+ int ret;
reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
@@ -443,13 +448,30 @@
case DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI:
if (!strncmp(dwc->hsphy_interface, "utmi", 4)) {
reg &= ~DWC3_GUSB2PHYCFG_ULPI_UTMI;
+ break;
} else if (!strncmp(dwc->hsphy_interface, "ulpi", 4)) {
reg |= DWC3_GUSB2PHYCFG_ULPI_UTMI;
+ dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
} else {
dev_warn(dwc->dev, "HSPHY Interface not defined\n");
- break;
+
+ /* Relying on default value. */
+ if (!(reg & DWC3_GUSB2PHYCFG_ULPI_UTMI))
+ break;
}
/* FALLTHROUGH */
+ case DWC3_GHWPARAMS3_HSPHY_IFC_ULPI:
+ /* Making sure the interface and PHY are operational */
+ ret = dwc3_soft_reset(dwc);
+ if (ret)
+ return ret;
+
+ udelay(1);
+
+ ret = dwc3_ulpi_init(dwc);
+ if (ret)
+ return ret;
+ /* FALLTHROUGH */
default:
break;
}
@@ -467,6 +489,8 @@
reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
+
+ return 0;
}
/**
@@ -906,7 +930,9 @@
platform_set_drvdata(pdev, dwc);
dwc3_cache_hwparams(dwc);
- dwc3_phy_setup(dwc);
+ ret = dwc3_phy_setup(dwc);
+ if (ret)
+ goto err0;
ret = dwc3_core_get_phy(dwc);
if (ret)
@@ -994,6 +1020,7 @@
err1:
dwc3_free_event_buffers(dwc);
+ dwc3_ulpi_exit(dwc);
err0:
/*
@@ -1029,6 +1056,7 @@
phy_power_off(dwc->usb3_generic_phy);
dwc3_core_exit(dwc);
+ dwc3_ulpi_exit(dwc);
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);