linux-kernel - [PATCH] ARM: supplementing IO accessors with 64 bit capability

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Date:	Wed, 22 Oct 2014 10:06:23 -0600
From:	mathieu.poirier@...aro.org
To:	linux@....linux.org.uk
Cc:	catalin.marinas@....com, stefano.stabellini@...citrix.com,
	ezequiel.garcia@...e-electrons.com, Liviu.Dudau@....com,
	thomas.petazzoni@...e-electrons.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	mathieu.poirier@...aro.org
Subject: [PATCH] ARM: supplementing IO accessors with 64 bit capability

From: Mathieu Poirier <mathieu.poirier@...aro.org>

Some drivers on ARMv7 need 64 bit read and writes.

Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 arch/arm/include/asm/io.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
index 1805674..861e52c 100644
--- a/arch/arm/include/asm/io.h
+++ b/arch/arm/include/asm/io.h
@@ -118,6 +118,24 @@ static inline u32 __raw_readl(const volatile void __iomem *addr)
 	return val;
 }
 
+#if __LINUX_ARM_ARCH__ >= 5
+static inline void __raw_writeq(u64 val, volatile void __iomem *addr)
+{
+	asm volatile("strd %1, %0"
+		     : "+Qo" (*(volatile u64 __force *)addr)
+		     : "r" (val));
+}
+
+static inline u64 __raw_readq(const volatile void __iomem *addr)
+{
+	u64 val;
+	asm volatile("ldrd %1, %0"
+		     : "+Qo" (*(volatile u64 __force *)addr),
+		       "=r" (val));
+	return val;
+}
+#endif
+
 /*
  * Architecture ioremap implementation.
  */
@@ -306,10 +324,13 @@ extern void _memset_io(volatile void __iomem *, int, size_t);
 					__raw_readw(c)); __r; })
 #define readl_relaxed(c) ({ u32 __r = le32_to_cpu((__force __le32) \
 					__raw_readl(c)); __r; })
+#define readq_relaxed(c) ({ u64 __r = le64_to_cpu((__force __le64) \
+					__raw_readq(c)); __r; })
 
 #define writeb_relaxed(v,c)	__raw_writeb(v,c)
 #define writew_relaxed(v,c)	__raw_writew((__force u16) cpu_to_le16(v),c)
 #define writel_relaxed(v,c)	__raw_writel((__force u32) cpu_to_le32(v),c)
+#define writeq_relaxed(v,c)	__raw_writeq((__force u64) cpu_to_le64(v),c)
 
 #define readb(c)		({ u8  __v = readb_relaxed(c); __iormb(); __v; })
 #define readw(c)		({ u16 __v = readw_relaxed(c); __iormb(); __v; })
-- 
1.9.1

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