linux.git/drivers/dma/xilinx, branch v4.13

dmaengine: zynqmp_dma: Remove max len check in zynqmp_dma_prep_memcpy

2017-07-03T05:06:46+00:00

Remove check for "len > ZYNQMP_DMA_MAX_TRANS_LEN" as its not needed.
If the length is larger, the transfer is split up into multiple parts
with the max descriptor length already.

Signed-off-by: Stefan Roese 
Cc: Kedareswara rao Appana 
Cc: Vinod Koul 
Signed-off-by: Vinod Koul

dmaengine: xilinx: avoid memory corruption for device_prep_dma_memcpy()

2017-03-14T10:44:29+00:00

The device_prep_dma_memcpy() callback for this driver allocates a new
xilinx_dma_tx_descriptor whose TX segments list is initialized as empty,
but then gets invalid TX segment pointer by list_last_entry() from the
empty TX segments list and memory corruption happens by the attempt to
update the next descriptor in invalid TX segment pointer.

This removes unnecessary memory access for nonexistent tail TX segment
which causes memory corruption.

Cc: Vinod Koul 
Cc: Kedareswara rao Appana 
Cc: Michal Simek 
Signed-off-by: Akinobu Mita 
Signed-off-by: Vinod Koul

dmaengine: xilinx: fix device_terminate_all() callback for AXI CDMA

2017-03-14T10:44:29+00:00

The device_terminate_all() callback for this driver stops current DMA
operations by clearing RUNSTOP bit in the control register and waiting
HALTED bit set in the status register.

But AXI CDMA which is one of the supported DMA engine by this driver
does not provide the run / stop controls and those bits in the control
and status registers are reserved.  So when device_terminate_all() is
called, the error message is printed and the channel is marked as having
errors in xilinx_dma_halt().

This change adds stop_transfer() callback which differentiates CDMA and
other DMA engine.  The CDMA's one avoids the unsupported operations and
instead polls the status register to check if the DMA operations are in
progress for AXI CDMA.

Cc: Vinod Koul 
Cc: Kedareswara rao Appana 
Cc: Michal Simek 
Signed-off-by: Akinobu Mita 
Signed-off-by: Vinod Koul

dmengine: xilinx_dma: convert callback to helper function

2016-08-08T02:41:43+00:00

Move the xilinx driver to new dmaengine callback

Signed-off-by: Vinod Koul

dmaengine: zynqmp_dma: add missing MODULE_LICENSE

2016-07-24T06:25:17+00:00

We get a warning about the missing MODULE_LICENSE tag for this newly
added driver module:

WARNING: modpost: missing MODULE_LICENSE() in drivers/dma/xilinx/zynqmp_dma.o
see include/linux/module.h for more information

This adds a "GPL" license, matching the "version 2 or later" information in
the comment at the start of the file.

Signed-off-by: Arnd Bergmann 
Acked-by: Kedareswara rao Appana 
Signed-off-by: Vinod Koul

dmaengine: zynqmp_dma: Fix static checker warning

2016-07-24T05:49:22+00:00

This patch fixes the below static checker warning
drivers/dma/xilinx/zynqmp_dma.c:973 zynqmp_dma_chan_probe()
        warn: was && intended here instead of ||?

Reported-by: Dan Carpenter 
Signed-off-by: Kedareswara rao Appana 
Signed-off-by: Vinod Koul

dmaengine: zynqmp: avoid cast warning

2016-07-12T04:33:16+00:00

The newly added zynqmp_dma driver produces a warning on 32-bit architectures
when dma_addr_t is 64-bit wide:

drivers/dma/xilinx/zynqmp_dma.c: In function 'zynqmp_dma_config_sg_ll_desc':
drivers/dma/xilinx/zynqmp_dma.c:321:9: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
        ((dma_addr_t)sdesc - (dma_addr_t)chan->desc_pool_v);
         ^
drivers/dma/xilinx/zynqmp_dma.c:321:29: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
        ((dma_addr_t)sdesc - (dma_addr_t)chan->desc_pool_v);

This changes the cast to the more appropriate uintptr_t.

Signed-off-by: Arnd Bergmann 
Signed-off-by: Vinod Koul

dmaengine: xilinx: Fix race condition in axi dma cyclic dma mode

2016-07-12T04:31:36+00:00

In cyclic DMA mode need to link the tail bd segment
with the head bd segment to process bd's in cyclic.

Current driver is doing this only for tx channel
needs to update the same for rx channel case also.

This patch fixes the same.

Signed-off-by: Kedareswara rao Appana 
Signed-off-by: Vinod Koul

dmaengine: Add Xilinx zynqmp dma engine driver support

2016-07-08T05:55:34+00:00

Added the driver for zynqmp dma engine used in Zynq
UltraScale+ MPSoC. This dma controller supports memory to memory
and I/O to I/O buffer transfers.

Signed-off-by: Kedareswara rao Appana 
Signed-off-by: Vinod Koul

dmaengine: xilinx: Use different channel names for each dma

2016-07-08T05:21:49+00:00

Current driver assumes that child node channel name is either
"xlnx,axi-vdma-mm2s-channel" or "xlnx,axi-vdma-s2mm-channel"
which is confusing the users of AXI DMA and CDMA.
This patch fixes this issue by using different channel
names for the AXI DMA and AXI CDMA child nodes.

Signed-off-by: Kedareswara rao Appana 
Acked-by: Rob Herring 
Signed-off-by: Vinod Koul