linux.git/drivers/dma/xilinx, branch v5.5

Merge branch 'fixes' into next

2019-11-14T10:32:51+00:00

dmaengine: xilinx_dma: Add Xilinx AXI MCDMA Engine driver support

2019-11-06T17:08:02+00:00

Add support for AXI Multichannel Direct Memory Access (AXI MCDMA)
core, which is a soft Xilinx IP core that provides high-bandwidth
direct memory access between memory and AXI4-Stream target peripherals.
The AXI MCDMA core provides scatter-gather interface with multiple
independent transmit and receive channels. The driver supports
device_prep_slave_sg slave transfer mode.

Signed-off-by: Radhey Shyam Pandey 
Link: https://lore.kernel.org/r/1571763622-29281-7-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul

dmaengine: xilinx_dma: Extend dma_config struct to store irq routine handle

2019-11-06T17:08:01+00:00

Extend dma_config structure to store irq routine handle. It enables runtime
handler selection based on xdma_ip_type and serves as preparatory patch for
adding MCDMA IP support.

Signed-off-by: Radhey Shyam Pandey 
Suggested-by: Vinod Koul 
Link: https://lore.kernel.org/r/1571763622-29281-6-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul

dmaengine: xilinx_dma: Remove axidma multichannel mode support

2019-11-06T17:08:01+00:00

The AXI DMA multichannel support is deprecated in the IP and it is no
longer actively supported. For multichannel support, refer to the AXI
multichannel direct memory access IP product guide(PG228) and MCDMA
driver. So inline with it remove axidma multichannel support from
from the driver.

Signed-off-by: Radhey Shyam Pandey 
Link: https://lore.kernel.org/r/1571763622-29281-5-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul

dmaengine: xilinx_dma: Clear desc_pendingcount in xilinx_dma_reset

2019-10-20T14:05:27+00:00

Whenever we reset the channel, we need to clear desc_pendingcount
along with desc_submitcount. Otherwise when a new transaction is
submitted, the irq coalesce level could be programmed to an incorrect
value in the axidma case.

This behavior can be observed when terminating pending transactions
with xilinx_dma_terminate_all() and then submitting new transactions
without releasing and requesting the channel.

Signed-off-by: Nicholas Graumann 
Signed-off-by: Radhey Shyam Pandey 
Link: https://lore.kernel.org/r/1571150904-3988-8-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul

dmaengine: xilinx_dma: Print debug message when no free tx segments

2019-10-20T14:05:27+00:00

The driver should not run out of tx segments in normal operation. But,
if the user attempts to prepare a transaction with a large sg list,
the driver may not have enough free segments to accommodate the request.

Log a message at the debug level to inform the user in case they are
experiencing issues.

Signed-off-by: Nicholas Graumann 
Signed-off-by: Radhey Shyam Pandey 
Link: https://lore.kernel.org/r/1571150904-3988-7-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul

dmaengine: xilinx_dma: Add callback_result support

2019-10-20T14:05:27+00:00

Take advantage of dmaengine_desc_get_callback_invoke which allows either
a callback or callback_result to be specified. This can be useful when
using the AXI DMA transfer unknown quantities of data where the residue
contained in the result can be used to calculate the number of bytes
transferred.

Signed-off-by: Nicholas Graumann 
Signed-off-by: Radhey Shyam Pandey 
Link: https://lore.kernel.org/r/1571150904-3988-6-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul

dmaengine: xilinx_dma: Introduce xilinx_dma_get_residue

2019-10-20T14:05:27+00:00

Introduce a function that can calculate residues for IPs that support it:
AXI DMA and CDMA.

Signed-off-by: Nicholas Graumann 
Signed-off-by: Radhey Shyam Pandey 
Link: https://lore.kernel.org/r/1571150904-3988-5-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul

dmaengine: xilinx_dma: Remove residue from channel data

2019-10-20T14:05:27+00:00

There is no use of storing channel data residue field. So clean it up.
In tx_status simply pass calculated residue to dma_set_residue.

Signed-off-by: Radhey Shyam Pandey 
Link: https://lore.kernel.org/r/1571150904-3988-4-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul

dmaengine: xilinx_dma: Merge get_callback and _invoke

2019-10-20T14:05:27+00:00

The dma api provides a single interface to get the appropriate callback
and invoke it directly. Prefer using it.

Signed-off-by: Nicholas Graumann 
Signed-off-by: Radhey Shyam Pandey 
Link: https://lore.kernel.org/r/1571150904-3988-3-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul