ARM: sunxi: Add earlyprintk support

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

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index b0f3857..f12bc3a 100644 (file)
--- a/arch/arm/Kconfig.debug
+++ b/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"

diff --git a/arch/arm/include/debug/sunxi.S b/arch/arm/include/debug/sunxi.S
new file mode 100644 (file)
index 0000000..3bf61ca
--- /dev/null
+++ b/arch/arm/include/debug/sunxi.S
@@ -0,0 +1,24 @@
+/*
+ * 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>