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authorMike Frysinger <vapier.adi@gmail.com>2008-11-18 17:48:22 +0800
committerBryan Wu <cooloney@kernel.org>2008-11-18 17:48:22 +0800
commit3c1fbd5184f9c3c52c0a392fae0efb0b0d99a079 (patch)
tree1b94bd6487234e7cbfc0b09bf6221e25e02e0a12 /arch
parentfe85cad25e56aad5e020ea5cab50a100892f645b (diff)
Blackfin arch: rewrite blackfin_invalidate_entire_dcache function
rewrite blackfin_invalidate_entire_dcache() in C for easier management, better optimization, and so we take all SSYNC anomalies into account Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/blackfin/mach-common/Makefile2
-rw-r--r--arch/blackfin/mach-common/cache-c.c24
-rw-r--r--arch/blackfin/mach-common/cache.S36
3 files changed, 25 insertions, 37 deletions
diff --git a/arch/blackfin/mach-common/Makefile b/arch/blackfin/mach-common/Makefile
index 9388b4ab734..38911c6f964 100644
--- a/arch/blackfin/mach-common/Makefile
+++ b/arch/blackfin/mach-common/Makefile
@@ -3,7 +3,7 @@
#
obj-y := \
- cache.o entry.o head.o \
+ cache.o cache-c.o entry.o head.o \
interrupt.o irqpanic.o arch_checks.o ints-priority.o
obj-$(CONFIG_BFIN_ICACHE_LOCK) += lock.o
diff --git a/arch/blackfin/mach-common/cache-c.c b/arch/blackfin/mach-common/cache-c.c
new file mode 100644
index 00000000000..e6ab1f81512
--- /dev/null
+++ b/arch/blackfin/mach-common/cache-c.c
@@ -0,0 +1,24 @@
+/*
+ * Blackfin cache control code (simpler control-style functions)
+ *
+ * Copyright 2004-2008 Analog Devices Inc.
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <asm/blackfin.h>
+
+/* Invalidate the Entire Data cache by
+ * clearing DMC[1:0] bits
+ */
+void blackfin_invalidate_entire_dcache(void)
+{
+ u32 dmem = bfin_read_DMEM_CONTROL();
+ SSYNC();
+ bfin_write_DMEM_CONTROL(dmem & ~0xc);
+ SSYNC();
+ bfin_write_DMEM_CONTROL(dmem);
+ SSYNC();
+}
diff --git a/arch/blackfin/mach-common/cache.S b/arch/blackfin/mach-common/cache.S
index 11875128743..3c98dacbf28 100644
--- a/arch/blackfin/mach-common/cache.S
+++ b/arch/blackfin/mach-common/cache.S
@@ -97,39 +97,3 @@ ENTRY(_blackfin_dflush_page)
P1 = 1 << (PAGE_SHIFT - L1_CACHE_SHIFT);
jump .Ldfr;
ENDPROC(_blackfin_dflush_page)
-
-/* Invalidate the Entire Data cache by
- * clearing DMC[1:0] bits
- */
-ENTRY(_blackfin_invalidate_entire_dcache)
- [--SP] = ( R7:5);
-
- P0.L = LO(DMEM_CONTROL);
- P0.H = HI(DMEM_CONTROL);
- R7 = [P0];
- R5 = R7; /* Save DMEM_CNTR */
-
- /* Clear the DMC[1:0] bits, All valid bits in the data
- * cache are set to the invalid state
- */
- BITCLR(R7,DMC0_P);
- BITCLR(R7,DMC1_P);
- CLI R6;
- SSYNC; /* SSYNC required before writing to DMEM_CONTROL. */
- .align 8;
- [P0] = R7;
- SSYNC;
- STI R6;
-
- /* Configures the data cache again */
-
- CLI R6;
- SSYNC; /* SSYNC required before writing to DMEM_CONTROL. */
- .align 8;
- [P0] = R5;
- SSYNC;
- STI R6;
-
- ( R7:5) = [SP++];
- RTS;
-ENDPROC(_blackfin_invalidate_entire_dcache)