x86: efi-x86_payload: Enable usb keyboard during boot

For boards that don't route serial port pins out, it's quite common
to attach a USB keyboard as the input device, along with a monitor.
However USB is not automatically started in the generic efi payload
codes. This uses a payload specific last_stage_init() to start the
USB bus, so that a USB keyboard can be used on the U-Boot shell.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/x86/cpu/cpu.c

@@ -193,7 +193,7 @@ void show_boot_progress(int val)
 	outb(val, POST_PORT);
 }
 
-#ifndef CONFIG_SYS_COREBOOT
+#if !defined(CONFIG_SYS_COREBOOT) && !defined(CONFIG_EFI_STUB)
 /*
  * Implement a weak default function for boards that optionally
  * need to clean up the system before jumping to the kernel.

arch/x86/cpu/efi/payload.c

@@ -7,6 +7,7 @@
 #include <common.h>
 #include <efi.h>
 #include <errno.h>
+#include <usb.h>
 #include <asm/post.h>
 
 DECLARE_GLOBAL_DATA_PTR;
@@ -160,3 +161,11 @@ int reserve_arch(void)
 
 	return 0;
 }
+
+int last_stage_init(void)
+{
+	/* start usb so that usb keyboard can be used as input device */
+	usb_init();
+
+	return 0;
+}

include/configs/efi-x86_payload.h

@@ -14,7 +14,7 @@
 
 #define CONFIG_SYS_MONITOR_LEN		(1 << 20)
 
-#define CONFIG_STD_DEVICES_SETTINGS	"stdin=serial,i8042-kbd\0" \
+#define CONFIG_STD_DEVICES_SETTINGS	"stdin=serial,i8042-kbd,usbkbd\0" \
 					"stdout=serial,vidconsole\0" \
 					"stderr=serial,vidconsole\0"