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| author | Grygorii Strashko <grygorii.strashko@ti.com> | 2014-04-24 17:30:05 +0200 |
|---|---|---|
| committer | Santosh Shilimkar <santosh.shilimkar@ti.com> | 2014-05-07 15:21:43 +0200 |
| commit | 6ce0d20016925d031f1e24d64302e4c976d7cec6 (patch) | |
| tree | 2f02186f806c757e7e85f7a31d0210e5f4ef498a /arch/arm/mm | |
| parent | of: configure the platform device dma parameters (diff) | |
| download | linux-6ce0d20016925d031f1e24d64302e4c976d7cec6.tar.xz linux-6ce0d20016925d031f1e24d64302e4c976d7cec6.zip | |
ARM: dma: Use dma_pfn_offset for dma address translation
In most of cases DMA addresses can be performed using offset value of
Bus address space relatively to physical address space as following:
PFN->DMA:
__pfn_to_phys(pfn + [-]dma_pfn_offset)
DMA->PFN:
__phys_to_pfn(dma_addr) + [-]dma_pfn_offset
Thanks to Russell King for suggesting the optimised macro's for
conversion.
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Olof Johansson <olof@lixom.net>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Diffstat (limited to 'arch/arm/mm')
0 files changed, 0 insertions, 0 deletions