From 22ae813b85df7c0b0fc7c8d6f336d6a9f566ff97 Mon Sep 17 00:00:00 2001 From: Brice Goglin Date: Tue, 20 Jun 2006 20:03:02 -0700 Subject: [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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- lib/iomap_copy.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'lib') 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); -- cgit v1.2.3-59-g8ed1b