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authorBrice Goglin <brice@myri.com>2006-06-20 20:03:02 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-20 20:24:58 -0700
commit22ae813b85df7c0b0fc7c8d6f336d6a9f566ff97 (patch)
tree0c7d3ecf772be41facaffdda60b037d1e31c8e98
parent34641a58a227e498adf471ab016bd054cc399d7e (diff)
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[PATCH] add __iowrite64_copy
Introduce __iowrite64_copy. It will be used by the Myri-10G Ethernet driver to post requests to the NIC. This driver will be submitted soon. __iowrite64_copy copies to I/O memory in units of 64 bits when possible (on 64 bit architectures). It reverts to __iowrite32_copy on 32 bit architectures. Signed-off-by: Brice Goglin <brice@myri.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--include/linux/io.h1
-rw-r--r--lib/iomap_copy.c28
2 files changed, 29 insertions, 0 deletions
diff --git a/include/linux/io.h b/include/linux/io.h
index 85533ec5aaa..420e2fdf26f 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -21,5 +21,6 @@
#include <asm/io.h>
void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
+void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
#endif /* _LINUX_IO_H */
diff --git a/lib/iomap_copy.c b/lib/iomap_copy.c
index 351045f4f63..864fc5ea398 100644
--- a/lib/iomap_copy.c
+++ b/lib/iomap_copy.c
@@ -40,3 +40,31 @@ void __attribute__((weak)) __iowrite32_copy(void __iomem *to,
__raw_writel(*src++, dst++);
}
EXPORT_SYMBOL_GPL(__iowrite32_copy);
+
+/**
+ * __iowrite64_copy - copy data to MMIO space, in 64-bit or 32-bit units
+ * @to: destination, in MMIO space (must be 64-bit aligned)
+ * @from: source (must be 64-bit aligned)
+ * @count: number of 64-bit quantities to copy
+ *
+ * Copy data from kernel space to MMIO space, in units of 32 or 64 bits at a
+ * time. Order of access is not guaranteed, nor is a memory barrier
+ * performed afterwards.
+ */
+void __attribute__((weak)) __iowrite64_copy(void __iomem *to,
+ const void *from,
+ size_t count)
+{
+#ifdef CONFIG_64BIT
+ u64 __iomem *dst = to;
+ const u64 *src = from;
+ const u64 *end = src + count;
+
+ while (src < end)
+ __raw_writeq(*src++, dst++);
+#else
+ __iowrite32_copy(to, from, count * 2);
+#endif
+}
+
+EXPORT_SYMBOL_GPL(__iowrite64_copy);