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authorBrice Goglin <brice@myri.com>2006-06-20 23:03:02 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-20 23:24:58 -0400
commit22ae813b85df7c0b0fc7c8d6f336d6a9f566ff97 (patch)
tree0c7d3ecf772be41facaffdda60b037d1e31c8e98 /lib/iomap_copy.c
parent34641a58a227e498adf471ab016bd054cc399d7e (diff)
[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>
Diffstat (limited to 'lib/iomap_copy.c')
-rw-r--r--lib/iomap_copy.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/lib/iomap_copy.c b/lib/iomap_copy.c
index 351045f4f63c..864fc5ea398c 100644
--- a/lib/iomap_copy.c
+++ b/lib/iomap_copy.c
@@ -40,3 +40,31 @@ void __attribute__((weak)) __iowrite32_copy(void __iomem *to,
40 __raw_writel(*src++, dst++); 40 __raw_writel(*src++, dst++);
41} 41}
42EXPORT_SYMBOL_GPL(__iowrite32_copy); 42EXPORT_SYMBOL_GPL(__iowrite32_copy);
43
44/**
45 * __iowrite64_copy - copy data to MMIO space, in 64-bit or 32-bit units
46 * @to: destination, in MMIO space (must be 64-bit aligned)
47 * @from: source (must be 64-bit aligned)
48 * @count: number of 64-bit quantities to copy
49 *
50 * Copy data from kernel space to MMIO space, in units of 32 or 64 bits at a
51 * time. Order of access is not guaranteed, nor is a memory barrier
52 * performed afterwards.
53 */
54void __attribute__((weak)) __iowrite64_copy(void __iomem *to,
55 const void *from,
56 size_t count)
57{
58#ifdef CONFIG_64BIT
59 u64 __iomem *dst = to;
60 const u64 *src = from;
61 const u64 *end = src + count;
62
63 while (src < end)
64 __raw_writeq(*src++, dst++);
65#else
66 __iowrite32_copy(to, from, count * 2);
67#endif
68}
69
70EXPORT_SYMBOL_GPL(__iowrite64_copy);