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Commit 22ae813b authored by Brice Goglin's avatar Brice Goglin Committed by Linus Torvalds
Browse files

[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: default avatarBrice Goglin <brice@myri.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 34641a58

include/linux/io.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -21,5 +21,6 @@ 
#include <asm/io.h>

#include <asm/io.h>





void __iowrite32_copy(void __iomem *to, const void *from, size_t count);

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 */
 
#endif /* _LINUX_IO_H */

lib/iomap_copy.c

+28 −0
Original line number Original line Diff line number Diff line
@@ -40,3 +40,31 @@ void __attribute__((weak)) __iowrite32_copy(void __iomem *to, 
		__raw_writel(*src++, dst++);

		__raw_writel(*src++, dst++);

}

}

EXPORT_SYMBOL_GPL(__iowrite32_copy);

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);