usb: host: xhci-plat: add support for the R-Car H3 xHCI controllers

The R-Car H3 has two xHCI controllers. This SoC is compatible with
R-Car Gen2 SoCs, however this SoC doesn't need some specific registers
setting, and need a new firmware.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/usb-xhci.txt

@@ -3,8 +3,8 @@ USB xHCI controllers
 Required properties:
   - compatible: should be one of "generic-xhci",
     "marvell,armada-375-xhci", "marvell,armada-380-xhci",
-    "renesas,xhci-r8a7790", "renesas,xhci-r8a7791", "renesas,xhci-r8a7793"
-    (deprecated: "xhci-platform").
+    "renesas,xhci-r8a7790", "renesas,xhci-r8a7791", "renesas,xhci-r8a7793",
+    "renesas,xhci-r8a7795" (deprecated: "xhci-platform").
   - reg: should contain address and length of the standard XHCI
     register set for the device.
   - interrupts: one XHCI interrupt should be described here.

drivers/usb/host/xhci-plat.c

@@ -52,7 +52,8 @@ static int xhci_plat_setup(struct usb_hcd *hcd)
 {
 	int ret;
 
-	if (xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2)) {
+	if (xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2) ||
+	    xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3)) {
 		ret = xhci_rcar_init_quirk(hcd);
 		if (ret)
 			return ret;
@@ -63,7 +64,8 @@ static int xhci_plat_setup(struct usb_hcd *hcd)
 
 static int xhci_plat_start(struct usb_hcd *hcd)
 {
-	if (xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2))
+	if (xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2) ||
+	    xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3))
 		xhci_rcar_start(hcd);
 
 	return xhci_run(hcd);
@@ -79,6 +81,11 @@ static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen2 = {
 	.firmware_name = XHCI_RCAR_FIRMWARE_NAME_V1,
 };
 
+static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen3 = {
+	.type = XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3,
+	.firmware_name = XHCI_RCAR_FIRMWARE_NAME_V2,
+};
+
 static const struct of_device_id usb_xhci_of_match[] = {
 	{
 		.compatible = "generic-xhci",
@@ -99,6 +106,9 @@ static const struct of_device_id usb_xhci_of_match[] = {
 	}, {
 		.compatible = "renesas,xhci-r8a7793",
 		.data = &xhci_plat_renesas_rcar_gen2,
+	}, {
+		.compatible = "renesas,xhci-r8a7795",
+		.data = &xhci_plat_renesas_rcar_gen3,
 	}, {
 	},
 };

drivers/usb/host/xhci-plat.h

@@ -16,6 +16,7 @@
 enum xhci_plat_type {
 	XHCI_PLAT_TYPE_MARVELL_ARMADA,
 	XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2,
+	XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3,
 };
 
 struct xhci_plat_priv {

drivers/usb/host/xhci-rcar.c

@@ -17,7 +17,14 @@
 #include "xhci-plat.h"
 #include "xhci-rcar.h"
 
+/*
+* - The V2 firmware is possible to use on R-Car Gen2. However, the V2 causes
+*   performance degradation. So, this driver continues to use the V1 if R-Car
+*   Gen2.
+* - The V1 firmware is impossible to use on R-Car Gen3.
+*/
 MODULE_FIRMWARE(XHCI_RCAR_FIRMWARE_NAME_V1);
+MODULE_FIRMWARE(XHCI_RCAR_FIRMWARE_NAME_V2);
 
 /*** Register Offset ***/
 #define RCAR_USB3_INT_ENA	0x224	/* Interrupt Enable */

drivers/usb/host/xhci-rcar.h

@@ -12,6 +12,7 @@
 #define _XHCI_RCAR_H
 
 #define XHCI_RCAR_FIRMWARE_NAME_V1	"r8a779x_usb3_v1.dlmem"
+#define XHCI_RCAR_FIRMWARE_NAME_V2	"r8a779x_usb3_v2.dlmem"
 
 #if IS_ENABLED(CONFIG_USB_XHCI_RCAR)
 void xhci_rcar_start(struct usb_hcd *hcd);