dect
/
linux-2.6
Archived
13
0
Fork 0
Code Releases Activity

[ARM] 5488/1: ARM errata: Invalidation of the Instruction Cache operation can fail 

This patch implements the recommended workaround for erratum 411920
(ARM1136, ARM1156, ARM1176).

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Catalin Marinas 2009-04-30 17:06:03 +01:00 committed by Russell King
parent 10993374f8
commit 9cba3ccc8f
3 changed files with 63 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/arm/Kconfig
View File

@ -740,6 +740,15 @@ if !MMU
source "arch/arm/Kconfig-nommu"
endif
config ARM_ERRATA_411920
bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
depends on CPU_V6 && !SMP
help
Invalidation of the Instruction Cache operation can
fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
It does not affect the MPCore. This option enables the ARM Ltd.
recommended workaround.
endmenu
source "arch/arm/common/Kconfig"

33
arch/arm/mm/cache-v6.S
View File

@ -20,6 +20,31 @@
#define D_CACHE_LINE_SIZE 32
#define BTB_FLUSH_SIZE 8
#ifdef CONFIG_ARM_ERRATA_411920
/*
* Invalidate the entire I cache (this code is a workaround for the ARM1136
* erratum 411920 - Invalidate Instruction Cache operation can fail. This
* erratum is present in 1136, 1156 and 1176. It does not affect the MPCore.
*
* Registers:
* r0 - set to 0
* r1 - corrupted
*/
ENTRY(v6_icache_inval_all)
mov r0, #0
mrs r1, cpsr
cpsid ifa @ disable interrupts
mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
msr cpsr_cx, r1 @ restore interrupts
.rept 11 @ ARM Ltd recommends at least
nop @ 11 NOPs
.endr
mov pc, lr
#endif
/*
* v6_flush_cache_all()
*
@ -31,7 +56,11 @@ ENTRY(v6_flush_kern_cache_all)
mov r0, #0
#ifdef HARVARD_CACHE
mcr p15, 0, r0, c7, c14, 0 @ D cache clean+invalidate
#ifndef CONFIG_ARM_ERRATA_411920
mcr p15, 0, r0, c7, c5, 0 @ I+BTB cache invalidate
#else
b v6_icache_inval_all
#endif
#else
mcr p15, 0, r0, c7, c15, 0 @ Cache clean+invalidate
#endif
@ -103,7 +132,11 @@ ENTRY(v6_coherent_user_range)
mov r0, #0
#ifdef HARVARD_CACHE
mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
#ifndef CONFIG_ARM_ERRATA_411920
mcr p15, 0, r0, c7, c5, 0 @ I+BTB cache invalidate
#else
b v6_icache_inval_all
#endif
#else
mcr p15, 0, r0, c7, c5, 6 @ invalidate BTB
#endif

23
arch/arm/mm/flush.c
View File

@ -18,6 +18,10 @@
#include "mm.h"
#ifdef CONFIG_ARM_ERRATA_411920
extern void v6_icache_inval_all(void);
#endif
#ifdef CONFIG_CPU_CACHE_VIPT
#define ALIAS_FLUSH_START 0xffff4000
@ -32,10 +36,15 @@ static void flush_pfn_alias(unsigned long pfn, unsigned long vaddr)
asm( "mcrr p15, 0, %1, %0, c14\n"
" mcr p15, 0, %2, c7, c10, 4\n"
#ifndef CONFIG_ARM_ERRATA_411920
" mcr p15, 0, %2, c7, c5, 0\n"
#endif
:
: "r" (to), "r" (to + PAGE_SIZE - L1_CACHE_BYTES), "r" (zero)
: "cc");
#ifdef CONFIG_ARM_ERRATA_411920
v6_icache_inval_all();
#endif
}
void flush_cache_mm(struct mm_struct *mm)
@ -48,11 +57,16 @@ void flush_cache_mm(struct mm_struct *mm)
if (cache_is_vipt_aliasing()) {
asm( "mcr p15, 0, %0, c7, c14, 0\n"
" mcr p15, 0, %0, c7, c10, 4\n"
#ifndef CONFIG_ARM_ERRATA_411920
" mcr p15, 0, %0, c7, c5, 0\n"
" mcr p15, 0, %0, c7, c10, 4"
#endif
:
: "r" (0)
: "cc");
#ifdef CONFIG_ARM_ERRATA_411920
v6_icache_inval_all();
#endif
}
}
@ -67,11 +81,16 @@ void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned
if (cache_is_vipt_aliasing()) {
asm( "mcr p15, 0, %0, c7, c14, 0\n"
" mcr p15, 0, %0, c7, c10, 4\n"
#ifndef CONFIG_ARM_ERRATA_411920
" mcr p15, 0, %0, c7, c5, 0\n"
" mcr p15, 0, %0, c7, c10, 4"
#endif
:
: "r" (0)
: "cc");
#ifdef CONFIG_ARM_ERRATA_411920
v6_icache_inval_all();
#endif
}
}