From dc967d7f5e5d2c9d01c8ea172a1e231908dba9de Mon Sep 17 00:00:00 2001 From: Timur Tabi Date: Wed, 22 Aug 2007 20:07:28 -0500 Subject: [PATCH] [POWERPC] add clrsetbits macros This patch adds the clrsetbits_xxx() macros, which are used to set and clear multiple bits in a single read-modify-write operation. Specify the bits to clear in the 'clear' parameter and the bits to set in the 'set' parameter. These macros can also be used to set a multiple-bit bit pattern using a mask, by specifying the mask in the 'clear' parameter and the new bit pattern in the 'set' parameter. There are big-endian and little-endian versions for 8, 16, 32, and 64 bits. Signed-off-by: Timur Tabi Signed-off-by: Kumar Gala --- include/asm-powerpc/io.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/include/asm-powerpc/io.h b/include/asm-powerpc/io.h index 4c0b55087d..6805efb2cb 100644 --- a/include/asm-powerpc/io.h +++ b/include/asm-powerpc/io.h @@ -737,6 +737,29 @@ static inline void * bus_to_virt(unsigned long address) #define setbits8(_addr, _v) out_8((_addr), in_8(_addr) | (_v)) #define clrbits8(_addr, _v) out_8((_addr), in_8(_addr) & ~(_v)) +/* Clear and set bits in one shot. These macros can be used to clear and + * set multiple bits in a register using a single read-modify-write. These + * macros can also be used to set a multiple-bit bit pattern using a mask, + * by specifying the mask in the 'clear' parameter and the new bit pattern + * in the 'set' parameter. + */ + +#define clrsetbits(type, addr, clear, set) \ + out_##type((addr), (in_##type(addr) & ~(clear)) | (set)) + +#ifdef __powerpc64__ +#define clrsetbits_be64(addr, clear, set) clrsetbits(be64, addr, clear, set) +#define clrsetbits_le64(addr, clear, set) clrsetbits(le64, addr, clear, set) +#endif + +#define clrsetbits_be32(addr, clear, set) clrsetbits(be32, addr, clear, set) +#define clrsetbits_le32(addr, clear, set) clrsetbits(le32, addr, clear, set) + +#define clrsetbits_be16(addr, clear, set) clrsetbits(be16, addr, clear, set) +#define clrsetbits_le16(addr, clear, set) clrsetbits(le32, addr, clear, set) + +#define clrsetbits_8(addr, clear, set) clrsetbits(8, addr, clear, set) + #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_IO_H */ -- 2.39.5