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authorThomas Bogendoerfer <tsbogend@alpha.franken.de>2008-03-18 22:47:56 +0100
committerRalf Baechle <ralf@linux-mips.org>2008-07-15 18:44:32 +0100
commit7a2852e49fe2d19296812c0f0f833b0ee3043bbb (patch)
treeecee76f7532b5478109d4ee38b7da93522c3084c /include/asm-mips
parentc3dd3de789630b9b1ac8f5175f1c21bbf1cca939 (diff)
[MIPS] IP28: switch to "normal" mode after PROM no longer needed
SGI-IP28 is running in so called slow mode, when kernel is started from the PROM. PROM calls must be done in slow mode otherwise the PROM will issue an error. To get better memory performance we now switch to normal mode, when the PROM is no longer needed. Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'include/asm-mips')
-rw-r--r--include/asm-mips/barrier.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/asm-mips/barrier.h b/include/asm-mips/barrier.h
index 9d8cfbb5e796..8e9ac313ca3b 100644
--- a/include/asm-mips/barrier.h
+++ b/include/asm-mips/barrier.h
@@ -92,11 +92,25 @@
#define fast_wmb() __sync()
#define fast_rmb() __sync()
#define fast_mb() __sync()
+#ifdef CONFIG_SGI_IP28
+#define fast_iob() \
+ __asm__ __volatile__( \
+ ".set push\n\t" \
+ ".set noreorder\n\t" \
+ "lw $0,%0\n\t" \
+ "sync\n\t" \
+ "lw $0,%0\n\t" \
+ ".set pop" \
+ : /* no output */ \
+ : "m" (*(int *)CKSEG1ADDR(0x1fa00004)) \
+ : "memory")
+#else
#define fast_iob() \
do { \
__sync(); \
__fast_iob(); \
} while (0)
+#endif
#ifdef CONFIG_CPU_HAS_WB