arm: sunxi: coped sun4i's early-printk support to sun3i and sun5i

arch/arm/mach-sun3i/Kconfig

@@ -29,5 +29,13 @@ config SW_PIN_TEST
 	---help---
 	  "Test code for PIN module"
 
+config SW_DEBUG_UART
+	int "UART to use for low-level debug"
+	depends on DEBUG_LL
+	default 0
+	help
+	  Choose the UART on which kernel low-level debug messages should be
+	  output.
+
 endmenu
 endif

arch/arm/mach-sun3i/include/mach/debug-macro.S

@@ -0,0 +1,21 @@
+/*
+ * arch/arm/mach-sun3i/include/mach/debug-macro.S
+ *
+ * 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.
+*/
+
+#include <mach/platform.h>
+
+	.macro	addruart, rp, rv
+	ldr	\rp, =SW_PA_UART0_IO_BASE
+	ldr	\rv, =SW_VA_UART0_IO_BASE
+#if CONFIG_SW_DEBUG_UART != 0
+	add	\rp, \rp, #(0x400 * CONFIG_SW_DEBUG_UART)
+	add	\rv, \rv, #(0x400 * CONFIG_SW_DEBUG_UART)
+#endif
+	.endm
+
+#define UART_SHIFT	2
+#include <asm/hardware/debug-8250.S>

arch/arm/mach-sun5i/Kconfig

@@ -4,4 +4,13 @@ config SUN5I_FPGA
 	bool "FPGA Board Support"
 	help
 	  Only for FPGA board. 
+
+config SW_DEBUG_UART
+	int "UART to use for low-level debug"
+	depends on DEBUG_LL
+	default 0
+	help
+	  Choose the UART on which kernel low-level debug messages should be
+	  output.
+
 endif

arch/arm/mach-sun5i/include/mach/debug-macro.S

@@ -0,0 +1,21 @@
+/*
+ * arch/arm/mach-sun5i/include/mach/debug-macro.S
+ *
+ * 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.
+*/
+
+#include <mach/platform.h>
+
+	.macro	addruart, rp, rv
+	ldr	\rp, =SW_PA_UART0_IO_BASE
+	ldr	\rv, =SW_VA_UART0_IO_BASE
+#if CONFIG_SW_DEBUG_UART != 0
+	add	\rp, \rp, #(0x400 * CONFIG_SW_DEBUG_UART)
+	add	\rv, \rv, #(0x400 * CONFIG_SW_DEBUG_UART)
+#endif
+	.endm
+
+#define UART_SHIFT	2
+#include <asm/hardware/debug-8250.S>