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| author | Timur Tabi <timur@freescale.com> | 2007-08-22 20:07:28 -0500 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2007-09-14 08:53:56 -0500 |
| commit | dc967d7f5e5d2c9d01c8ea172a1e231908dba9de (patch) | |
| tree | e085e0a0741cec32556bcf011b33d0c1c63300a2 /include/asm-powerpc/io.h | |
| parent | 364f8ffc182ac5431b156ca1915dd81ddd4a592b (diff) | |
| download | lwn-dc967d7f5e5d2c9d01c8ea172a1e231908dba9de.tar.gz lwn-dc967d7f5e5d2c9d01c8ea172a1e231908dba9de.zip | |
[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 <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'include/asm-powerpc/io.h')
| -rw-r--r-- | include/asm-powerpc/io.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/include/asm-powerpc/io.h b/include/asm-powerpc/io.h index 4c0b55087dc7..6805efb2cb6d 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 */ |