x86: provide readq()/writeq() on 32-bit too, complete
[linux-2.6.git] / arch / x86 / include / asm / io.h
index ac2abc8..33513b9 100644 (file)
@@ -4,6 +4,7 @@
 #define ARCH_HAS_IOREMAP_WC
 
 #include <linux/compiler.h>
+#include <asm-generic/int-ll64.h>
 
 #define build_mmio_read(name, size, type, reg, barrier) \
 static inline type name(const volatile void __iomem *addr) \
@@ -45,20 +46,40 @@ build_mmio_write(__writel, "l", unsigned int, "r", )
 #define mmiowb() barrier()
 
 #ifdef CONFIG_X86_64
+
 build_mmio_read(readq, "q", unsigned long, "=r", :"memory")
-build_mmio_read(__readq, "q", unsigned long, "=r", )
 build_mmio_write(writeq, "q", unsigned long, "r", :"memory")
-build_mmio_write(__writeq, "q", unsigned long, "r", )
 
-#define readq_relaxed(a) __readq(a)
-#define __raw_readq __readq
-#define __raw_writeq writeq
+#else
+
+static inline __u64 readq(const volatile void __iomem *addr)
+{
+       const volatile u32 __iomem *p = addr;
+       u32 low, high;
+
+       low = readl(p);
+       high = readl(p + 1);
+
+       return low + ((u64)high << 32);
+}
+
+static inline void writeq(__u64 val, volatile void __iomem *addr)
+{
+       writel(val, addr);
+       writel(val >> 32, addr+4);
+}
 
-/* Let people know we have them */
-#define readq readq
-#define writeq writeq
 #endif
 
+#define readq_relaxed(a)       readq(a)
+
+#define __raw_readq(a)         readq(a)
+#define __raw_writeq(val, addr)        writeq(val, addr)
+
+/* Let people know that we have them */
+#define readq                  readq
+#define writeq                 writeq
+
 extern int iommu_bio_merge;
 
 #ifdef CONFIG_X86_32