linux-kernel - [PATCH] crypto: caam - Add definition of rd/wr

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Date:	Mon, 23 Jun 2014 18:49:30 +0530
From:	Ruchika Gupta <ruchika.gupta@...escale.com>
To:	<linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<herbert@...dor.apana.org.au>
CC:	<davem@...emloft.net>, <alexandru.porosanu@...escale.com>,
	<kim.phillips@...escale.com>, <dan.carpenter@...cle.com>,
	Ruchika Gupta <ruchika.gupta@...escale.com>
Subject: [PATCH] crypto: caam - Add definition of rd/wr_reg64 for little endian platform

CAAM IP has certain 64 bit registers . 32 bit architectures cannot force
atomic-64 operations.  This patch adds definition of these atomic-64
operations for little endian platforms. The definitions which existed
previously were for big endian platforms.

Signed-off-by: Ruchika Gupta <ruchika.gupta@...escale.com>
---
Tested on LS1021 platform

 drivers/crypto/caam/regs.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/crypto/caam/regs.h b/drivers/crypto/caam/regs.h
index cbde8b9..2825067 100644
--- a/drivers/crypto/caam/regs.h
+++ b/drivers/crypto/caam/regs.h
@@ -84,6 +84,7 @@
 #endif
 
 #ifndef CONFIG_64BIT
+#ifdef __BIG_ENDIAN
 static inline void wr_reg64(u64 __iomem *reg, u64 data)
 {
 	wr_reg32((u32 __iomem *)reg, (data & 0xffffffff00000000ull) >> 32);
@@ -95,6 +96,21 @@ static inline u64 rd_reg64(u64 __iomem *reg)
 	return (((u64)rd_reg32((u32 __iomem *)reg)) << 32) |
 		((u64)rd_reg32((u32 __iomem *)reg + 1));
 }
+#else
+#ifdef __LITTLE_ENDIAN
+static inline void wr_reg64(u64 __iomem *reg, u64 data)
+{
+	wr_reg32((u32 __iomem *)reg + 1, (data & 0xffffffff00000000ull) >> 32);
+	wr_reg32((u32 __iomem *)reg, data & 0x00000000ffffffffull);
+}
+
+static inline u64 rd_reg64(u64 __iomem *reg)
+{
+	return (((u64)rd_reg32((u32 __iomem *)reg + 1)) << 32) |
+		((u64)rd_reg32((u32 __iomem *)reg));
+}
+#endif
+#endif
 #endif
 
 /*
-- 
1.8.1.4

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