The legacy S3C-DMA API required every period of a cyclic buffer to be
queued separately. After conversion of Samsung ASoC to Samsung DMA
wrappers somebody made an assumption that the same is needed for DMA
engine API, which is not true.

In effect, Samsung ASoC DMA code was queuing the whole cyclic buffer
multiple times with a shift of one period per iteration, leading to:
  a) severe memory waste - up to 13x times more DMA transfer descriptors
     are allocated than needed,
  b) possible memory corruption, because further cyclic buffers were out
     of the original buffers, due to the offset.

This patch fixes this problem by making the legacy S3C-DMA API use the
same semantics as DMA engine (the whole cyclic buffer is enqueued at
once) and modifying users of Samsung DMA wrappers in cyclic mode to
behave appropriately.
Signed-off-by: NTomasz Figa <tomasz.figa@gmail.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NMark Brown <broonie@linaro.org>

This patch make the dma dev request operation compatible for both
DT and non-DT cases. It takes the all the arguments required for
dma_request_slave_channel and dma_request_channel. If the driver
is initiated via DT or non-DT the corresponding call will be made.
Signed-off-by: NPadmavathi Venna <padma.v@samsung.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

This patch adds config() that configures DMA transmit option.
This function was originally included in request(). But, Some
DMA client driver requires to change the configuration after
request(). So, This patch picks up it from request().
Signed-off-by: NBoojin Kim <boojin.kim@samsung.com>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

These files didn't exist at the time of the module.h split, and
so were not fixed by the commits on that baseline.  Since they use
the EXPORT_SYMBOL and/or THIS_MODULE macros, they will need the
new export.h file included that provides them.
Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This patch removes the samsung specific enum type 's3c2410_dmasrc'
and uses 'dma_data_direction' instead.
Signed-off-by: NBoojin Kim <boojin.kim@samsung.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Acked-by: NVinod Koul <vinod.koul@intel.com>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>

This patch adds common DMA operations which are used for Samsung DMA
drivers. Currently there are two types of DMA driver for Samsung SoCs.
The one is S3C-DMA for S3C SoCs and the other is PL330-DMA for S5P SoCs.
This patch provides funcion pointers for common DMA operations to DMA
client driver like SPI and Audio. It makes DMA client drivers support
multi-platform.
In addition, this common DMA operations implement the shared actions
that are needed for DMA client driver. For example shared actions are
filter() function for dma_request_channel() and parameter passing for
device_prep_slave_sg().
Signed-off-by: NBoojin Kim <boojin.kim@samsung.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Acked-by: NVinod Koul <vinod.koul@intel.com>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>