usb: dwc3-generic: add a new host driver that uses the dwc3 core

Currently the host driver used by dwc3-generic is "xhci-dwc3". This is
a functional driver but it doesn't use the dwc3 core and, in particular,
it lacks some bits that may be important.
For example on the k2 platforms, it is important that the phy are properly
suspended when the USB is not used anymore. The dwc3 core also has a
partial support for quirks.
The new driver can be used as a drop-in replacement for "xhci-dwc3".

In terms of implementation, it may seem strange that 2 private structures
dwc3_generic_host_priv and dwc3_generic_priv) are used. The reason for this
is simply that the xhci layer expects a struct xhci_ctrl at the beginning
of the private data and it seemed wasteful to include it also for the
peripheral case.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>

2 files changed, 54 insertions, 2 deletions

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 1bd41f8bc77..bb3f9d2fc82 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -887,7 +887,7 @@ int dwc3_shutdown_phy(struct udevice *dev, struct phy *usb_phys, int num_phys)
 }
 #endif
 
-#if CONFIG_IS_ENABLED(DM_USB_GADGET)
+#if CONFIG_IS_ENABLED(DM_USB)
 int dwc3_init(struct dwc3 *dwc)
 {
 	int ret;
diff --git a/drivers/usb/dwc3/dwc3-generic.c b/drivers/usb/dwc3/dwc3-generic.c
index d5c71d024f3..4924d07553f 100644
--- a/drivers/usb/dwc3/dwc3-generic.c
+++ b/drivers/usb/dwc3/dwc3-generic.c
@@ -21,6 +21,7 @@
 #include "gadget.h"
 #include <reset.h>
 #include <clk.h>
+#include <usb/xhci.h>
 
 struct dwc3_generic_plat {
 	fdt_addr_t base;
@@ -35,6 +36,11 @@ struct dwc3_generic_priv {
 	int num_phys;
 };
 
+struct dwc3_generic_host_priv {
+	struct xhci_ctrl xhci_ctrl;
+	struct dwc3_generic_priv gen_priv;
+};
+
 static int dwc3_generic_probe(struct udevice *dev,
 			      struct dwc3_generic_priv *priv)
 {
@@ -132,6 +138,50 @@ U_BOOT_DRIVER(dwc3_generic_peripheral) = {
 };
 #endif
 
+#if defined(CONFIG_SPL_USB_HOST_SUPPORT) || !defined(CONFIG_SPL_BUILD)
+static int dwc3_generic_host_probe(struct udevice *dev)
+{
+	struct xhci_hcor *hcor;
+	struct xhci_hccr *hccr;
+	struct dwc3_generic_host_priv *priv = dev_get_priv(dev);
+	int rc;
+
+	rc = dwc3_generic_probe(dev, &priv->gen_priv);
+	if (rc)
+		return rc;
+
+	hccr = (struct xhci_hccr *)priv->gen_priv.base;
+	hcor = (struct xhci_hcor *)(priv->gen_priv.base +
+			HC_LENGTH(xhci_readl(&(hccr)->cr_capbase)));
+
+	return xhci_register(dev, hccr, hcor);
+}
+
+static int dwc3_generic_host_remove(struct udevice *dev)
+{
+	struct dwc3_generic_host_priv *priv = dev_get_priv(dev);
+	int rc;
+
+	rc = xhci_deregister(dev);
+	if (rc)
+		return rc;
+
+	return dwc3_generic_remove(dev, &priv->gen_priv);
+}
+
+U_BOOT_DRIVER(dwc3_generic_host) = {
+	.name	= "dwc3-generic-host",
+	.id	= UCLASS_USB,
+	.ofdata_to_platdata = dwc3_generic_ofdata_to_platdata,
+	.probe = dwc3_generic_host_probe,
+	.remove = dwc3_generic_host_remove,
+	.priv_auto_alloc_size = sizeof(struct dwc3_generic_host_priv),
+	.platdata_auto_alloc_size = sizeof(struct dwc3_generic_plat),
+	.ops = &xhci_usb_ops,
+	.flags = DM_FLAG_ALLOC_PRIV_DMA,
+};
+#endif
+
 struct dwc3_glue_data {
 	struct clk_bulk		clks;
 	struct reset_ctl_bulk	resets;
@@ -252,10 +302,12 @@ static int dwc3_glue_bind(struct udevice *parent)
 			driver = "dwc3-generic-peripheral";
 #endif
 			break;
+#if defined(CONFIG_SPL_USB_HOST_SUPPORT) || !defined(CONFIG_SPL_BUILD)
 		case USB_DR_MODE_HOST:
 			debug("%s: dr_mode: HOST\n", __func__);
-			driver = "xhci-dwc3";
+			driver = "dwc3-generic-host";
 			break;
+#endif
 		default:
 			debug("%s: unsupported dr_mode\n", __func__);
 			return -ENODEV;