From: Rob Herring <rob.herring@calxeda.com>
Date: Tue, 5 Jul 2011 04:38:51 +0000 (+0000)
Subject: arm: add __ilog2 function
X-Git-Tag: v2011.09-rc1~219^2~8
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=0b9bc73711aed13246dd2cb91a3f658eeb25baf5;p=u-boot

arm: add __ilog2 function

Add __ilog2 function for ARM. Needed for ahci.c

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Albert ARIBAUD <albert.aribaud@free.fr>
---

diff --git a/arch/arm/include/asm/bitops.h b/arch/arm/include/asm/bitops.h
index 270f163eee..879e20e024 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..