diff options
| author | Brice Goglin <brice@myri.com> | 2006-06-21 07:03:02 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-21 07:24:58 +0400 |
| commit | 22ae813b85df7c0b0fc7c8d6f336d6a9f566ff97 (patch) | |
| tree | 0c7d3ecf772be41facaffdda60b037d1e31c8e98 | |
| parent | 34641a58a227e498adf471ab016bd054cc399d7e (diff) | |
| download | linux-22ae813b85df7c0b0fc7c8d6f336d6a9f566ff97.tar.xz | |
[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.h | 1 | ||||
| -rw-r--r-- | lib/iomap_copy.c | 28 |
2 files changed, 29 insertions, 0 deletions
diff --git a/include/linux/io.h b/include/linux/io.h index 85533ec5aaa1..420e2fdf26f6 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 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, __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); |