[PATCH v2 6/8] mips: octeon: cache.c: Flush all pending writes in flush_dcache_range()

[Stefan Roese <sr@denx.de>]

As noticed while working on the USB xHCI support, Octeon needs to flush
all pending writes so that the values are present in the memory. Add
this "syncw" instruction (twice) to flush_dcache_range().

Signed-off-by: Stefan Roese <sr@denx.de>
---

(no changes since v1)

 arch/mips/mach-octeon/cache.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/mips/mach-octeon/cache.c b/arch/mips/mach-octeon/cache.c
index 9a88bb97c7..f293d65dae 100644
--- a/arch/mips/mach-octeon/cache.c
+++ b/arch/mips/mach-octeon/cache.c
@@ -5,14 +5,13 @@
 
 #include <cpu_func.h>
 
-/*
- * The Octeon platform is cache coherent and cache flushes and invalidates
- * are not needed. Define some platform specific empty flush_foo()
- * functions here to overwrite the _weak common function as a no-op.
- * This effectively disables all cache operations.
- */
+/* Octeon memory write barrier */
+#define CVMX_SYNCW	asm volatile ("syncw\nsyncw\n" : : : "memory")
+
 void flush_dcache_range(ulong start_addr, ulong stop)
 {
+	/* Flush all pending writes */
+	CVMX_SYNCW;
 }
 
 void flush_cache(ulong start_addr, ulong size)
@@ -21,4 +20,5 @@ void flush_cache(ulong start_addr, ulong size)
 
 void invalidate_dcache_range(ulong start_addr, ulong stop)
 {
+	/* Don't need to do anything for OCTEON */
 }
-- 
2.28.0