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 <[EMAIL PROTECTED]> --- Renamed setclrbits to clrsetbits, since the clear is done first. This patch is for for-2.6.24, assuming I can get everyone to like it. include/asm-powerpc/io.h | 27 +++++++++++++++++++++++++++ 1 files changed, 27 insertions(+), 0 deletions(-) diff --git a/include/asm-powerpc/io.h b/include/asm-powerpc/io.h index bb8d965..0af2f7e 100644 --- a/include/asm-powerpc/io.h +++ b/include/asm-powerpc/io.h @@ -734,6 +734,33 @@ static inline void * bus_to_virt(unsigned long address) #define setbits16(_addr, _v) out_be16((_addr), in_be16(_addr) | (_v)) #define clrbits16(_addr, _v) out_be16((_addr), in_be16(_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. + */ + +#ifdef __powerpc64__ +#define clrsetbits_be64(addr, clear, set) \ + out_be64((addr), (in_be64(addr) & ~(clear)) | (set)) +#define clrsetbits_le64(addr, clear, set) \ + out_le64((addr), (in_le64(addr) & ~(clear)) | (set)) +#endif + +#define clrsetbits_be32(addr, clear, set) \ + out_be32((addr), (in_be32(addr) & ~(clear)) | (set)) +#define clrsetbits_be16(addr, clear, set) \ + out_be16((addr), (in_be16(addr) & ~(clear)) | (set)) + +#define clrsetbits_le32(addr, clear, set) \ + out_le32((addr), (in_le32(addr) & ~(clear)) | (set)) +#define clrsetbits_le16(addr, clear, set) \ + out_le16((addr), (in_le16(addr) & ~(clear)) | (set)) + +#define clrsetbits_8(addr, clear, set) \ + out_8((addr), (in_8(addr) & ~(clear)) | (set)) + #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_IO_H */ -- 1.5.2.4 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
