riscv: qemu: Enable usb keyboard as an input device

This brings PCI xHCI support to QEMU RISC-V and uses a usb keyboard
as one of the input devices.

Signed-off-by: Bin Meng <bmeng@tinylab.org>
Reviewed-by: Rick Chen <rick@andestech.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

board/emulation/qemu-riscv/Kconfig

@@ -76,5 +76,10 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	imply VIDEO_BOCHS
 	imply SYS_WHITE_ON_BLACK
 	imply PRE_CONSOLE_BUFFER
+	imply USB
+	imply USB_XHCI_HCD
+	imply USB_XHCI_PCI
+	imply USB_KEYBOARD
+	imply CMD_USB
 
 endif

board/emulation/qemu-riscv/qemu-riscv.c

@@ -12,6 +12,7 @@
 #include <log.h>
 #include <spl.h>
 #include <init.h>
+#include <usb.h>
 #include <virtio_types.h>
 #include <virtio.h>
 
@@ -41,6 +42,10 @@ int board_init(void)
 
 int board_late_init(void)
 {
+	/* start usb so that usb keyboard can be used as input device */
+	if (CONFIG_IS_ENABLED(USB_KEYBOARD))
+		usb_init();
+
 	return 0;
 }
 

doc/board/emulation/qemu-riscv.rst

@@ -138,6 +138,11 @@ and adding::
 
     -serial stdio -device VGA
 
+In addition, a usb keyboard can be attached to an emulated xHCI controller in
+RISC-V virt machine as an option of input devices by adding::
+
+    -device qemu-xhci,id=xhci -device usb-kbd,bus=xhci.0
+
 Running with KVM
 ----------------
 

include/configs/qemu-riscv.h

@@ -17,7 +17,7 @@
 
 /* Environment options */
 
-#define CFG_STD_DEVICES_SETTINGS	"stdin=serial\0" \
+#define CFG_STD_DEVICES_SETTINGS	"stdin=serial,usbkbd\0" \
 					"stdout=serial,vidconsole\0" \
 					"stderr=serial,vidconsole\0"