[U-Boot] [PATCH v2] arm: add __ilog2 function

[Rob Herring]

From: Rob Herring <rob.herring at calxeda.com>

Add __ilog2 function for ARM. Needed for ahci.c

Signed-off-by: Rob Herring <rob.herring at calxeda.com>
Cc: Albert ARIBAUD <albert.aribaud at free.fr>
---
Performance here is not critical, so I'm changing this to use the C
version. 

v2 changes:
- Change __inline__ to inline.
- Use generic_fls function instead of clz asm so it works with ARMv4.

 arch/arm/include/asm/bitops.h |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/arm/include/asm/bitops.h b/arch/arm/include/asm/bitops.h
index 270f163..879e20e 100644
--- a/arch/arm/include/asm/bitops.h
+++ b/arch/arm/include/asm/bitops.h
@@ -106,6 +106,11 @@ static inline int test_bit(int nr, const void * addr)
     return ((unsigned char *) addr)[nr >> 3] & (1U << (nr & 7));
 }
 
+static inline int __ilog2(unsigned int x)
+{
+	return generic_fls(x) - 1;
+}
+
 /*
  * ffz = Find First Zero in word. Undefined if no zero exists,
  * so code should check against ~0UL first..
-- 
1.7.4.1