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ARM: 7845/1: sharpsl_param.c: fix invalid memory access for pxa devices

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This fixes a regression for kernels after v3.2

After commit 72662e0108
ARM: head.S: only include __turn_mmu_on in the initial identity mapping

Zaurus PXA devices call sharpsl_save_param() during fixup and hang on
boot because memcpy refers to physical addresses no longer valid if the
MMU is setup.
Zaurus collie (SA1100) is unaffected (function is called in init_machine).

The code was making assumptions and for PXA the virtual address
should have been used before.

Signed-off-by: Marko Katic <dromede@gmail.com>
Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Andrea Adami 2013-09-26 23:23:02 +01:00 committed by Russell King
parent 262576fffe
commit 856337283a
1 changed files with 4 additions and 1 deletions
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5
arch/arm/common/sharpsl_param.c
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@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/string.h>
#include <asm/mach/sharpsl_param.h>
#include <asm/memory.h>
/*
* Certain hardware parameters determined at the time of device manufacture,
@ -25,8 +26,10 @@
*/
#ifdef CONFIG_ARCH_SA1100
#define PARAM_BASE 0xe8ffc000
#define param_start(x) (void *)(x)
#else
#define PARAM_BASE 0xa0000a00
#define param_start(x) __va(x)
#endif
#define MAGIC_CHG(a,b,c,d) ( ( d << 24 ) | ( c << 16 ) | ( b << 8 ) | a )
@ -41,7 +44,7 @@ EXPORT_SYMBOL(sharpsl_param);
void sharpsl_save_param(void)
{
memcpy(&sharpsl_param, (void *)PARAM_BASE, sizeof(struct sharpsl_param_info));
memcpy(&sharpsl_param, param_start(PARAM_BASE), sizeof(struct sharpsl_param_info));
if (sharpsl_param.comadj_keyword != COMADJ_MAGIC)
sharpsl_param.comadj=-1;