MIPS: Use WSBH/DSBH/DSHD on Loongson 3A

Signed-off-by: chenj <chenj@lemote.com>
Cc: linux-mips@linux-mips.org
Cc: chenhc@lemote.com
Patchwork: https://patchwork.linux-mips.org/patch/7542/
Patchwork: https://patchwork.linux-mips.org/patch/7550/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 14 insertions, 4 deletions

diff --git a/arch/mips/include/uapi/asm/swab.h b/arch/mips/include/uapi/asm/swab.h
index ac9a8f9cd1fb..8f2d184dbe9f 100644
--- a/arch/mips/include/uapi/asm/swab.h
+++ b/arch/mips/include/uapi/asm/swab.h
@@ -13,12 +13,16 @@
 
 #define __SWAB_64_THRU_32__
 
-#if defined(__mips_isa_rev) && (__mips_isa_rev >= 2)
+#if (defined(__mips_isa_rev) && (__mips_isa_rev >= 2)) ||               \
+    defined(_MIPS_ARCH_LOONGSON3A)
 
 static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
 {
         __asm__(
+        "       .set    push                    \n"
+        "       .set    arch=mips32r2           \n"
         "       wsbh    %0, %1                  \n"
+        "       .set    pop                     \n"
         : "=r" (x)
         : "r" (x));
 
@@ -29,8 +33,11 @@ static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
 static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
 {
         __asm__(
+        "       .set    push                    \n"
+        "       .set    arch=mips32r2           \n"
         "       wsbh    %0, %1                  \n"
         "       rotr    %0, %0, 16              \n"
+        "       .set    pop                     \n"
         : "=r" (x)
         : "r" (x));
 
@@ -46,8 +53,11 @@ static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
 static inline __attribute_const__ __u64 __arch_swab64(__u64 x)
 {
         __asm__(
-        "       dsbh    %0, %1\n"
-        "       dshd    %0, %0"
+        "       .set    push                    \n"
+        "       .set    arch=mips64r2           \n"
+        "       dsbh    %0, %1                  \n"
+        "       dshd    %0, %0                  \n"
+        "       .set    pop                     \n"
         : "=r" (x)
         : "r" (x));
 
@@ -55,5 +65,5 @@ static inline __attribute_const__ __u64 __arch_swab64(__u64 x)
 }
 #define __arch_swab64 __arch_swab64
 #endif /* __mips64 */
-#endif /* MIPS R2 or newer  */
+#endif /* MIPS R2 or newer or Loongson 3A */
 #endif /* _ASM_SWAB_H */