[PATCH 4/7] MIPS: OCTEON: Reverse the order of register accesses to the FAU

[Paul Martin <paul.martin@xxxxxxxxxxxxxxx>]

64 bit access is unaffected but for 32 bit access, swap high and
low words.  Similarly for 16 bit access, reverse the order of the
four possible words, and for 8 bit access reverse the order of byte
accesses.

Signed-off-by: Paul Martin <paul.martin@xxxxxxxxxxxxxxx>
---
 arch/mips/include/asm/octeon/cvmx-fau.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/arch/mips/include/asm/octeon/cvmx-fau.h b/arch/mips/include/asm/octeon/cvmx-fau.h
index ef98f7f..dafeae3 100644
--- a/arch/mips/include/asm/octeon/cvmx-fau.h
+++ b/arch/mips/include/asm/octeon/cvmx-fau.h
@@ -105,6 +105,16 @@ typedef union {
 	} s;
 } cvmx_fau_async_tagwait_result_t;
 
+#ifdef __BIG_ENDIAN_BITFIELD
+#define SWIZZLE_8  0
+#define SWIZZLE_16 0
+#define SWIZZLE_32 0
+#else
+#define SWIZZLE_8  0x7
+#define SWIZZLE_16 0x6
+#define SWIZZLE_32 0x4
+#endif
+
 /**
  * Builds a store I/O address for writing to the FAU
  *
@@ -175,6 +185,7 @@ static inline int64_t cvmx_fau_fetch_and_add64(cvmx_fau_reg_64_t reg,
 static inline int32_t cvmx_fau_fetch_and_add32(cvmx_fau_reg_32_t reg,
 					       int32_t value)
 {
+	reg ^= SWIZZLE_32;
 	return cvmx_read64_int32(__cvmx_fau_atomic_address(0, reg, value));
 }
 
@@ -189,6 +200,7 @@ static inline int32_t cvmx_fau_fetch_and_add32(cvmx_fau_reg_32_t reg,
 static inline int16_t cvmx_fau_fetch_and_add16(cvmx_fau_reg_16_t reg,
 					       int16_t value)
 {
+	reg ^= SWIZZLE_16;
 	return cvmx_read64_int16(__cvmx_fau_atomic_address(0, reg, value));
 }
 
@@ -201,6 +213,7 @@ static inline int16_t cvmx_fau_fetch_and_add16(cvmx_fau_reg_16_t reg,
  */
 static inline int8_t cvmx_fau_fetch_and_add8(cvmx_fau_reg_8_t reg, int8_t value)
 {
+	reg ^= SWIZZLE_8;
 	return cvmx_read64_int8(__cvmx_fau_atomic_address(0, reg, value));
 }
 
@@ -247,6 +260,7 @@ cvmx_fau_tagwait_fetch_and_add32(cvmx_fau_reg_32_t reg, int32_t value)
 		uint64_t i32;
 		cvmx_fau_tagwait32_t t;
 	} result;
+	reg ^= SWIZZLE_32;
 	result.i32 =
 	    cvmx_read64_int32(__cvmx_fau_atomic_address(1, reg, value));
 	return result.t;
@@ -270,6 +284,7 @@ cvmx_fau_tagwait_fetch_and_add16(cvmx_fau_reg_16_t reg, int16_t value)
 		uint64_t i16;
 		cvmx_fau_tagwait16_t t;
 	} result;
+	reg ^= SWIZZLE_16;
 	result.i16 =
 	    cvmx_read64_int16(__cvmx_fau_atomic_address(1, reg, value));
 	return result.t;
@@ -292,6 +307,7 @@ cvmx_fau_tagwait_fetch_and_add8(cvmx_fau_reg_8_t reg, int8_t value)
 		uint64_t i8;
 		cvmx_fau_tagwait8_t t;
 	} result;
+	reg ^= SWIZZLE_8;
 	result.i8 = cvmx_read64_int8(__cvmx_fau_atomic_address(1, reg, value));
 	return result.t;
 }
@@ -521,6 +537,7 @@ static inline void cvmx_fau_atomic_add64(cvmx_fau_reg_64_t reg, int64_t value)
  */
 static inline void cvmx_fau_atomic_add32(cvmx_fau_reg_32_t reg, int32_t value)
 {
+	reg ^= SWIZZLE_32;
 	cvmx_write64_int32(__cvmx_fau_store_address(0, reg), value);
 }
 
@@ -533,6 +550,7 @@ static inline void cvmx_fau_atomic_add32(cvmx_fau_reg_32_t reg, int32_t value)
  */
 static inline void cvmx_fau_atomic_add16(cvmx_fau_reg_16_t reg, int16_t value)
 {
+	reg ^= SWIZZLE_16;
 	cvmx_write64_int16(__cvmx_fau_store_address(0, reg), value);
 }
 
@@ -544,6 +562,7 @@ static inline void cvmx_fau_atomic_add16(cvmx_fau_reg_16_t reg, int16_t value)
  */
 static inline void cvmx_fau_atomic_add8(cvmx_fau_reg_8_t reg, int8_t value)
 {
+	reg ^= SWIZZLE_8;
 	cvmx_write64_int8(__cvmx_fau_store_address(0, reg), value);
 }
 
@@ -568,6 +587,7 @@ static inline void cvmx_fau_atomic_write64(cvmx_fau_reg_64_t reg, int64_t value)
  */
 static inline void cvmx_fau_atomic_write32(cvmx_fau_reg_32_t reg, int32_t value)
 {
+	reg ^= SWIZZLE_32;
 	cvmx_write64_int32(__cvmx_fau_store_address(1, reg), value);
 }
 
@@ -580,6 +600,7 @@ static inline void cvmx_fau_atomic_write32(cvmx_fau_reg_32_t reg, int32_t value)
  */
 static inline void cvmx_fau_atomic_write16(cvmx_fau_reg_16_t reg, int16_t value)
 {
+	reg ^= SWIZZLE_16;
 	cvmx_write64_int16(__cvmx_fau_store_address(1, reg), value);
 }
 
@@ -591,6 +612,7 @@ static inline void cvmx_fau_atomic_write16(cvmx_fau_reg_16_t reg, int16_t value)
  */
 static inline void cvmx_fau_atomic_write8(cvmx_fau_reg_8_t reg, int8_t value)
 {
+	reg ^= SWIZZLE_8;
 	cvmx_write64_int8(__cvmx_fau_store_address(1, reg), value);
 }
 
-- 
2.1.4