ARM: sunxi: Add earlyprintk support

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Stefan Roese <sr@denx.de>

arch/arm/Kconfig.debug

@@ -345,6 +345,13 @@ choice
 		  Say Y here if you want kernel low-level debugging support
 		  on SOCFPGA based platforms.
 
+	config DEBUG_SUNXI_UART1
+		bool "Kernel low-level debugging messages via sunXi UART1"
+		depends on ARCH_SUNXI
+		help
+		  Say Y here if you want kernel low-level debugging support
+		  on Allwinner A1X based platforms on the UART1.
+
 	config DEBUG_VEXPRESS_UART0_DETECT
 		bool "Autodetect UART0 on Versatile Express Cortex-A core tiles"
 		depends on ARCH_VEXPRESS && CPU_CP15_MMU
@@ -416,6 +423,7 @@ config DEBUG_LL_INCLUDE
 	default "debug/mvebu.S" if DEBUG_MVEBU_UART
 	default "debug/picoxcell.S" if DEBUG_PICOXCELL_UART
 	default "debug/socfpga.S" if DEBUG_SOCFPGA_UART
+	default "debug/sunxi.S" if DEBUG_SUNXI_UART1
 	default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT || \
 		DEBUG_VEXPRESS_UART0_CA9 || DEBUG_VEXPRESS_UART0_RS1
 	default "mach/debug-macro.S"

arch/arm/include/debug/sunxi.S

+/*
+ * Early serial output macro for Allwinner A1X SoCs
+ *
+ * Copyright (C) 2012 Maxime Ripard
+ *
+ * Maxime Ripard <maxime.ripard@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#ifdef CONFIG_DEBUG_SUNXI_UART1
+#define SUNXI_UART_DEBUG_PHYS_BASE 0x01c28400
+#define SUNXI_UART_DEBUG_VIRT_BASE 0xf1c28400
+#endif
+
+	.macro	addruart, rp, rv, tmp
+	ldr	\rp, =SUNXI_UART_DEBUG_PHYS_BASE
+	ldr	\rv, =SUNXI_UART_DEBUG_VIRT_BASE
+	.endm
+
+#define UART_SHIFT	2
+#include <asm/hardware/debug-8250.S>