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Commit dc967d7f authored by Timur Tabi's avatar Timur Tabi Committed by Kumar Gala
Browse files

[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: default avatarTimur Tabi <timur@freescale.com>
Signed-off-by: default avatarKumar Gala <galak@kernel.crashing.org>
parent 364f8ffc

include/asm-powerpc/io.h

+23 −0
Original line number Diff line number Diff line
@@ -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 */