Commit 95f3df6b authored by Russell King's avatar Russell King Committed by Russell King

[ARM] Fix SA110/SA1100 cache flushing

We had two implementations for flushing the cache, which meant StrongARM
caches weren't being correctly flushed.  Fix this by always using the
v4wb_flush_kern_cache_all method, rather than duplicating it.
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent f1dc24d5
......@@ -10,7 +10,7 @@
#include <linux/config.h>
#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/hardware.h>
#include <asm/memory.h>
#include <asm/page.h>
#include "proc-macros.S"
......@@ -46,6 +46,11 @@
*/
#define CACHE_DLIMIT (CACHE_DSIZE * 4)
.data
flush_base:
.long FLUSH_BASE
.text
/*
* flush_user_cache_all()
*
......@@ -63,11 +68,21 @@ ENTRY(v4wb_flush_kern_cache_all)
mov ip, #0
mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
__flush_whole_cache:
mov r0, #FLUSH_BASE
add r1, r0, #CACHE_DSIZE
1: ldr r2, [r0], #32
cmp r0, r1
ldr r3, =flush_base
ldr r1, [r3, #0]
eor r1, r1, #CACHE_DSIZE
str r1, [r3, #0]
add r2, r1, #CACHE_DSIZE
1: ldr r3, [r1], #32
cmp r1, r2
blo 1b
#ifdef FLUSH_BASE_MINICACHE
add r2, r2, #FLUSH_BASE_MINICACHE - FLUSH_BASE
sub r1, r2, #512 @ only 512 bytes
1: ldr r3, [r1], #32
cmp r1, r2
blo 1b
#endif
mcr p15, 0, ip, c7, c10, 4 @ drain write buffer
mov pc, lr
......@@ -82,6 +97,7 @@ __flush_whole_cache:
* - flags - vma_area_struct flags describing address space
*/
ENTRY(v4wb_flush_user_cache_range)
mov ip, #0
sub r3, r1, r0 @ calculate total size
tst r2, #VM_EXEC @ executable region?
mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache
......
......@@ -26,22 +26,7 @@
* the cache line size of the I and D cache
*/
#define DCACHELINESIZE 32
#define FLUSH_OFFSET 32768
.macro flush_110_dcache rd, ra, re
ldr \rd, =flush_base
ldr \ra, [\rd]
eor \ra, \ra, #FLUSH_OFFSET
str \ra, [\rd]
add \re, \ra, #16384 @ only necessary for 16k
1001: ldr \rd, [\ra], #DCACHELINESIZE
teq \re, \ra
bne 1001b
.endm
.data
flush_base:
.long FLUSH_BASE
.text
/*
......@@ -145,13 +130,11 @@ ENTRY(cpu_sa110_dcache_clean_area)
*/
.align 5
ENTRY(cpu_sa110_switch_mm)
flush_110_dcache r3, ip, r1
mov r1, #0
mcr p15, 0, r1, c7, c5, 0 @ invalidate I cache
mcr p15, 0, r1, c7, c10, 4 @ drain WB
str lr, [sp, #-4]!
bl v4wb_flush_kern_cache_all @ clears IP
mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
mcr p15, 0, r1, c8, c7, 0 @ invalidate I & D TLBs
mov pc, lr
mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
ldr pc, [sp], #4
/*
* cpu_sa110_set_pte(ptep, pte)
......
......@@ -30,30 +30,6 @@
* the cache line size of the I and D cache
*/
#define DCACHELINESIZE 32
#define FLUSH_OFFSET 32768
.macro flush_1100_dcache rd, ra, re
ldr \rd, =flush_base
ldr \ra, [\rd]
eor \ra, \ra, #FLUSH_OFFSET
str \ra, [\rd]
add \re, \ra, #8192 @ only necessary for 8k
1001: ldr \rd, [\ra], #DCACHELINESIZE
teq \re, \ra
bne 1001b
#ifdef FLUSH_BASE_MINICACHE
add \ra, \ra, #FLUSH_BASE_MINICACHE - FLUSH_BASE
add \re, \ra, #512 @ only 512 bytes
1002: ldr \rd, [\ra], #DCACHELINESIZE
teq \re, \ra
bne 1002b
#endif
.endm
.data
flush_base:
.long FLUSH_BASE
.text
__INIT
......@@ -79,9 +55,8 @@ ENTRY(cpu_sa1100_proc_fin)
stmfd sp!, {lr}
mov ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
msr cpsr_c, ip
flush_1100_dcache r0, r1, r2 @ clean caches
mov r0, #0
mcr p15, 0, r0, c15, c2, 2 @ Disable clock switching
bl v4wb_flush_kern_cache_all
mcr p15, 0, ip, c15, c2, 2 @ Disable clock switching
mrc p15, 0, r0, c1, c0, 0 @ ctrl register
bic r0, r0, #0x1000 @ ...i............
bic r0, r0, #0x000e @ ............wca.
......@@ -167,14 +142,12 @@ ENTRY(cpu_sa1100_dcache_clean_area)
*/
.align 5
ENTRY(cpu_sa1100_switch_mm)
flush_1100_dcache r3, ip, r1
mov ip, #0
mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
str lr, [sp, #-4]!
bl v4wb_flush_kern_cache_all @ clears IP
mcr p15, 0, ip, c9, c0, 0 @ invalidate RB
mcr p15, 0, ip, c7, c10, 4 @ drain WB
mcr p15, 0, r0, c2, c0, 0 @ load page table pointer
mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs
mov pc, lr
ldr pc, [sp], #4
/*
* cpu_sa1100_set_pte(ptep, pte)
......
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