[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>

diff --git a/include/asm-powerpc/io.h b/include/asm-powerpc/io.h
index 4c0b550..6805efb 100644 (file)
--- 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 */