io-64-nonatomic: add io{read|write}64[be]{_lo_hi|_hi_lo} macros

This patch adds generic io{read|write}64[be]{_lo_hi|_hi_lo} macros if
they are not already defined by the architecture. (As they are provided
by the generic iomap library).

The patch also points io{read|write}64[be] to the variant specified by the
header name.

This is because new drivers are encouraged to use ioreadXX, et al instead
of readX[1], et al -- and mixing ioreadXX with readq is pretty ugly.

[1] LDD3: section 9.4.2

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 64 insertions, 0 deletions

diff --git a/include/linux/io-64-nonatomic-lo-hi.h b/include/linux/io-64-nonatomic-lo-hi.h
index d042e7bb5adb..faaa842dbdb9 100644
--- a/include/linux/io-64-nonatomic-lo-hi.h
+++ b/include/linux/io-64-nonatomic-lo-hi.h
@@ -55,4 +55,68 @@ static inline void lo_hi_writeq_relaxed(__u64 val, volatile void __iomem *addr)
 #define writeq_relaxed lo_hi_writeq_relaxed
 #endif
 
+#ifndef ioread64_lo_hi
+#define ioread64_lo_hi ioread64_lo_hi
+static inline u64 ioread64_lo_hi(void __iomem *addr)
+{
+	u32 low, high;
+
+	low = ioread32(addr);
+	high = ioread32(addr + sizeof(u32));
+
+	return low + ((u64)high << 32);
+}
+#endif
+
+#ifndef iowrite64_lo_hi
+#define iowrite64_lo_hi iowrite64_lo_hi
+static inline void iowrite64_lo_hi(u64 val, void __iomem *addr)
+{
+	iowrite32(val, addr);
+	iowrite32(val >> 32, addr + sizeof(u32));
+}
+#endif
+
+#ifndef ioread64be_lo_hi
+#define ioread64be_lo_hi ioread64be_lo_hi
+static inline u64 ioread64be_lo_hi(void __iomem *addr)
+{
+	u32 low, high;
+
+	low = ioread32be(addr + sizeof(u32));
+	high = ioread32be(addr);
+
+	return low + ((u64)high << 32);
+}
+#endif
+
+#ifndef iowrite64be_lo_hi
+#define iowrite64be_lo_hi iowrite64be_lo_hi
+static inline void iowrite64be_lo_hi(u64 val, void __iomem *addr)
+{
+	iowrite32be(val, addr + sizeof(u32));
+	iowrite32be(val >> 32, addr);
+}
+#endif
+
+#ifndef ioread64
+#define ioread64_is_nonatomic
+#define ioread64 ioread64_lo_hi
+#endif
+
+#ifndef iowrite64
+#define iowrite64_is_nonatomic
+#define iowrite64 iowrite64_lo_hi
+#endif
+
+#ifndef ioread64be
+#define ioread64be_is_nonatomic
+#define ioread64be ioread64be_lo_hi
+#endif
+
+#ifndef iowrite64be
+#define iowrite64be_is_nonatomic
+#define iowrite64be iowrite64be_lo_hi
+#endif
+
 #endif	/* _LINUX_IO_64_NONATOMIC_LO_HI_H_ */