Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=dc967d7f5e5d2c9d01c8ea172a1e231908dba9de
Commit: dc967d7f5e5d2c9d01c8ea172a1e231908dba9de
Parent: 364f8ffc182ac5431b156ca1915dd81ddd4a592b
Author: Timur Tabi <[EMAIL PROTECTED]>
AuthorDate: Wed Aug 22 20:07:28 2007 -0500
Committer: Kumar Gala <[EMAIL PROTECTED]>
CommitDate: Fri Sep 14 08:53:56 2007 -0500
[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 <[EMAIL PROTECTED]>
Signed-off-by: Kumar Gala <[EMAIL PROTECTED]>
---
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 4c0b550..6805efb 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 */
-
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