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ARM: sunxi: Add earlyprintk support

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Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Maxime Ripard 2012-11-08 12:40:49 +01:00
parent 3b52634f0b
commit cb84fa18a4
2 changed files with 32 additions and 0 deletions
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8
arch/arm/Kconfig.debug
View file

@ -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"

24
arch/arm/include/debug/sunxi.S Normal file
View file

@ -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>