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dmaengine: Add Freescale i.MX SDMA support

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This patch adds support for the Freescale i.MX SDMA engine.

The SDMA engine is a scatter/gather DMA engine which is implemented
as a seperate coprocessor. SDMA needs its own firmware which is
requested using the standard request_firmware mechanism. The firmware
has different entry points for each peripheral type, so drivers
have to pass the peripheral type to the DMA engine which in turn
picks the correct firmware entry point from a table contained in
the firmware image itself.
The original Freescale code also supports support for transfering
data to the internal SRAM which needs different entry points to
the firmware. Support for this is currently not implemented. Also,
support for the ASRC (asymmetric sample rate converter) is skipped.

I took a very simple approach to implement dmaengine support. Only
a single descriptor is statically assigned to a each channel. This
means that transfers can't be queued up but only a single transfer
is in progress. This simplifies implementation a lot and is sufficient
for the usual device/memory transfers.

Signed-off-by: Sascha Hauer <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Sascha Hauer 2010-09-30 13:56:34 +00:00 • committed by Dan Williams
commit 1ec1e82f25
6 changed files with 1487 additions and 6 deletions
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8
drivers/dma/Kconfig
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@ -195,6 +195,14 @@ config PCH_DMA
help
Enable support for the Topcliff PCH DMA engine.
config IMX_SDMA
tristate "i.MX SDMA support"
depends on ARCH_MX25 || ARCH_MX3 || ARCH_MX5
select DMA_ENGINE
help
Support the i.MX SDMA engine. This engine is integrated into
Freescale i.MX25/31/35/51 chips.
config DMA_ENGINE
bool

1
drivers/dma/Makefile
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@ -21,6 +21,7 @@ obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o
obj-$(CONFIG_SH_DMAE) += shdma.o
obj-$(CONFIG_COH901318) += coh901318.o coh901318_lli.o
obj-$(CONFIG_AMCC_PPC440SPE_ADMA) += ppc4xx/
obj-$(CONFIG_IMX_SDMA) += imx-sdma.o
obj-$(CONFIG_TIMB_DMA) += timb_dma.o
obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o
obj-$(CONFIG_PL330_DMA) += pl330.o

1392
drivers/dma/imx-sdma.c Normal file
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