MIPS: Modify core io.h macros to account for the Octeon Errata Core-301.

Signed-off-by: Tomaso Paoletti <tpaoletti@caviumnetworks.com>
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
index 501a40b9f18d..436878e4e063 100644
--- a/arch/mips/include/asm/io.h
+++ b/arch/mips/include/asm/io.h
@@ -295,6 +295,12 @@ static inline void iounmap(const volatile void __iomem *addr)
 #undef __IS_KSEG1
 }
 
+#ifdef CONFIG_CPU_CAVIUM_OCTEON
+#define war_octeon_io_reorder_wmb()             wmb()
+#else
+#define war_octeon_io_reorder_wmb()             do { } while (0)
+#endif
+
 #define __BUILD_MEMORY_SINGLE(pfx, bwlq, type, irq)                     \
                                                                         \
 static inline void pfx##write##bwlq(type val,                           \
@@ -303,6 +309,8 @@ static inline void pfx##write##bwlq(type val,				\
         volatile type *__mem;                                           \
         type __val;                                                     \
                                                                         \
+        war_octeon_io_reorder_wmb();                                    \
+                                                                        \
         __mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem));    \
                                                                         \
         __val = pfx##ioswab##bwlq(__mem, val);                          \
@@ -370,6 +378,8 @@ static inline void pfx##out##bwlq##p(type val, unsigned long port)	\
         volatile type *__addr;                                          \
         type __val;                                                     \
                                                                         \
+        war_octeon_io_reorder_wmb();                                    \
+                                                                        \
         __addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base + port); \
                                                                         \
         __val = pfx##ioswab##bwlq(__addr, val);                         \
@@ -504,8 +514,12 @@ BUILDSTRING(q, u64)
 #endif
 
 
+#ifdef CONFIG_CPU_CAVIUM_OCTEON
+#define mmiowb() wmb()
+#else
 /* Depends on MIPS II instruction set */
 #define mmiowb() asm volatile ("sync" ::: "memory")
+#endif
 
 static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
 {