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[PATCH] ARM: 2745/1: Fix IXP4xx debug macros 

Patch from Deepak Saxena

Current IXP4xx debug macros do not work in the small window between
the MMU being enabled and the call to map_io() b/c the standard
peripheral mapping is not properly setup for use with the low-level
debug code. This patch creates a new section-aligned mapping for the
UART specifically for use with the debug macros.

Signed-off-by: Deepak Saxena
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Deepak Saxena 2005-06-24 20:54:35 +01:00 committed by Russell King
parent c4982887ca
commit 5932ae3f5d
3 changed files with 19 additions and 0 deletions
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8
arch/arm/mach-ixp4xx/common.c
View File

@ -141,7 +141,15 @@ static struct map_desc ixp4xx_io_desc[] __initdata = {
.physical = IXP4XX_PCI_CFG_BASE_PHYS,
.length = IXP4XX_PCI_CFG_REGION_SIZE,
.type = MT_DEVICE
},
#ifdef CONFIG_DEBUG_LL
{ /* Debug UART mapping */
.virtual = IXP4XX_DEBUG_UART_BASE_VIRT,
.physical = IXP4XX_DEBUG_UART_BASE_PHYS,
.length = IXP4XX_DEBUG_UART_REGION_SIZE,
.type = MT_DEVICE
}
#endif
};
void __init ixp4xx_map_io(void)

1
include/asm-arm/arch-ixp4xx/debug-macro.S
View File

@ -14,6 +14,7 @@
mrc p15, 0, \rx, c1, c0
tst \rx, #1 @ MMU enabled?
moveq \rx, #0xc8000000
orrne \rx, \rx, #0x00b00000
movne \rx, #0xff000000
add \rx,\rx,#3 @ Uart regs are at off set of 3 if
@ byte writes used - Big Endian.

10
include/asm-arm/arch-ixp4xx/ixp4xx-regs.h
View File

@ -69,6 +69,16 @@
#define IXP4XX_PERIPHERAL_BASE_VIRT (0xFFBF2000)
#define IXP4XX_PERIPHERAL_REGION_SIZE (0x0000C000)
/*
* Debug UART
*
* This is basically a remap of UART1 into a region that is section
* aligned so that it * can be used with the low-level debug code.
*/
#define IXP4XX_DEBUG_UART_BASE_PHYS (0xC8000000)
#define IXP4XX_DEBUG_UART_BASE_VIRT (0xffb00000)
#define IXP4XX_DEBUG_UART_REGION_SIZE (0x00001000)
#define IXP4XX_EXP_CS0_OFFSET 0x00
#define IXP4XX_EXP_CS1_OFFSET 0x04
#define IXP4XX_EXP_CS2_OFFSET 0x08