86 lines
2.3 KiB
Diff
86 lines
2.3 KiB
Diff
From: Florian Fainelli <f.fainelli@gmail.com>
|
|
Subject: [PATCH] ARM: BCM5301x: Disable MMU and Dcache during decompression
|
|
Date: Tue, 14 Jul 2015 16:12:08 -0700
|
|
|
|
Use the existing __armv7_mmu_cache_flush() to perform the cache flush
|
|
since this does what we are after.
|
|
|
|
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
|
|
---
|
|
arch/arm/boot/compressed/Makefile | 4 +++
|
|
arch/arm/boot/compressed/head-bcm_5301x-mpcore.S | 37 ++++++++++++++++++++++++
|
|
arch/arm/boot/compressed/head.S | 2 ++
|
|
3 files changed, 43 insertions(+)
|
|
create mode 100644 arch/arm/boot/compressed/head-bcm_5301x-mpcore.S
|
|
|
|
--- a/arch/arm/boot/compressed/Makefile
|
|
+++ b/arch/arm/boot/compressed/Makefile
|
|
@@ -31,6 +31,10 @@ ifeq ($(CONFIG_ARCH_ACORN),y)
|
|
OBJS += ll_char_wr.o font.o
|
|
endif
|
|
|
|
+ifeq ($(CONFIG_ARCH_BCM_5301X),y)
|
|
+OBJS += head-bcm_5301x-mpcore.o
|
|
+endif
|
|
+
|
|
ifeq ($(CONFIG_ARCH_SA1100),y)
|
|
OBJS += head-sa1100.o
|
|
endif
|
|
--- /dev/null
|
|
+++ b/arch/arm/boot/compressed/head-bcm_5301x-mpcore.S
|
|
@@ -0,0 +1,37 @@
|
|
+/*
|
|
+ *
|
|
+ * Platform specific tweaks. This is merged into head.S by the linker.
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/linkage.h>
|
|
+#include <asm/assembler.h>
|
|
+#include <asm/cp15.h>
|
|
+
|
|
+ .section ".start", "ax"
|
|
+
|
|
+/*
|
|
+ * This code section is spliced into the head code by the linker
|
|
+ */
|
|
+
|
|
+__plat_uncompress_start:
|
|
+
|
|
+ @ Preserve r8/r7 i.e. kernel entry values
|
|
+ mov r12, r8
|
|
+
|
|
+ @ Clear MMU enable and Dcache enable bits
|
|
+ mrc p15, 0, r0, c1, c0, 0 @ Read SCTLR
|
|
+ bic r0, #CR_C|CR_M
|
|
+ mcr p15, 0, r0, c1, c0, 0 @ Write SCTLR
|
|
+ nop
|
|
+
|
|
+ @ Call the cache invalidation routine
|
|
+ bl __armv7_mmu_cache_flush_fn
|
|
+ nop
|
|
+ mov r0,#0
|
|
+ ldr r3, =0x19022000 @ L2 cache controller, control reg
|
|
+ str r0, [r3, #0x100] @ Disable L2 cache
|
|
+ nop
|
|
+
|
|
+ @ Restore
|
|
+ mov r8, r12
|
|
--- a/arch/arm/boot/compressed/head.S
|
|
+++ b/arch/arm/boot/compressed/head.S
|
|
@@ -1152,6 +1152,7 @@ __armv7_mmu_cache_flush:
|
|
hierarchical:
|
|
mcr p15, 0, r10, c7, c10, 5 @ DMB
|
|
stmfd sp!, {r0-r7, r9-r11}
|
|
+ENTRY(__armv7_mmu_cache_flush_fn)
|
|
mrc p15, 1, r0, c0, c0, 1 @ read clidr
|
|
ands r3, r0, #0x7000000 @ extract loc from clidr
|
|
mov r3, r3, lsr #23 @ left align loc bit field
|
|
@@ -1201,6 +1202,7 @@ iflush:
|
|
mcr p15, 0, r10, c7, c10, 4 @ DSB
|
|
mcr p15, 0, r10, c7, c5, 4 @ ISB
|
|
mov pc, lr
|
|
+ENDPROC(__armv7_mmu_cache_flush_fn)
|
|
|
|
__armv5tej_mmu_cache_flush:
|
|
tst r4, #1
|