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drivers: dma-mapping: allow dma_common_mmap() for NOMMU

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Currently, internals of dma_common_mmap() is compiled out if build is
done for either NOMMU or target which explicitly says it does not
have/want coherent DMA mmap. It turned out that dma_common_mmap() can
be handy in NOMMU setup (at least for ARM).

This patch converts exitent NOMMU targets to use ARCH_NO_COHERENT_DMA_MMAP,
thus when CONFIG_MMU is gone from dma_common_mmap() their behaviour stays
unchanged.

ARM is not converted to ARCH_NO_COHERENT_DMA_MMAP because it 1)
already has mmap callback which can handle (at some extent) NOMMU 2)
already defines dummy pgprot_noncached() for NOMMU build.

c6x and frv stay untouched since they already have ARCH_NO_COHERENT_DMA_MMAP.

Cc: Steven Miao <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Yoshinori Sato <[email protected]>
Cc: Rich Felker <[email protected]>
Cc: Chris Zankel <[email protected]>
Cc: Max Filippov <[email protected]>
Suggested-by: Christoph Hellwig <[email protected]>
Signed-off-by: Vladimir Murzin <[email protected]>
Tested-by: Benjamin Gaignard <[email protected]>
This commit is contained in:
Vladimir Murzin 2017-06-28 10:16:57 +01:00 • committed by Christoph Hellwig
commit 07c75d7a6b
7 changed files with 8 additions and 2 deletions
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1
arch/xtensa/Kconfig
View file

@ -3,6 +3,7 @@ config ZONE_DMA
config XTENSA
def_bool y
select ARCH_NO_COHERENT_DMA_MMAP if !MMU
select ARCH_WANT_FRAME_POINTERS
select ARCH_WANT_IPC_PARSE_VERSION
select BUILDTIME_EXTABLE_SORT