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[v3,0/3] dmaengine: sf-pdma: Add platform dma driver

Message ID 20190920085930.19380-1-green.wan@sifive.com (mailing list archive)
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Series dmaengine: sf-pdma: Add platform dma driver | expand

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Green Wan Sept. 20, 2019, 8:58 a.m. UTC 
Add PDMA driver support for SiFive HiFive Unleashed RevA00 board. Mainly follows
DMAengine controller doc[1] to implement and take other DMA drivers as reference.
Such as

  - drivers/dma/fsl-edma.c
  - drivers/dma/dw-edma/
  - drivers/dma/pxa-dma.c

Using DMA test client[2] to test. Detailed datasheet is doc[3]. Driver supports:

 - 4 physical DMA channels, share same DONE and error interrupt handler. 
 - Support MEM_TO_MEM
 - Tested by DMA test client
 - patches include DT Bindgins document and dts for fu450-c000 SoC. Separate dts
   patch for easier review and apply to different branch or SoC platform.
 - retry 1 time if DMA error occurs.

[Reference Doc]
 [1] ./Documentation/driver-api/dmaengine/provider.rst
 [2] ./Documentation/driver-api/dmaengine/dmatest.rst
 [3] https://static.dev.sifive.com/FU540-C000-v1.0.pdf 

[Simple steps to test of DMA Test client]
 $ echo 1 > /sys/module/dmatest/parameters/iterations
 $ echo dma0chan0 > /sys/module/dmatest/parameters/channel
 $ echo dma0chan1 > /sys/module/dmatest/parameters/channel
 $ echo dma0chan2 > /sys/module/dmatest/parameters/channel
 $ echo dma0chan3 > /sys/module/dmatest/parameters/channel
 $ echo 1 > /sys/module/dmatest/parameters/run

[Expected test result]
[ 7756.975356] dmatest: dma0chan0-copy0: summary 11208260 tests, 0 failures 36207.82 iops 579325 KB/s (0)
[ 7756.984093] dmatest: dma0chan1-copy0: summary 11206263 tests, 0 failures 36007.36 iops 576117 KB/s (0)
[ 7756.993453] dmatest: dma0chan2-copy0: summary 10929638 tests, 0 failures 33984.39 iops 543750 KB/s (0)
[ 7757.003008] dmatest: dma0chan3-copy0: summary 11204208 tests, 0 failures 35759.65 iops 572154 KB/s (0)

Green Wan (3):
  dt-bindings: dmaengine: sf-pdma: add bindins for SiFive PDMA
  riscv: dts: add support for PDMA device of HiFive Unleashed Rev A00
  dmaengine: sf-pdma: add platform DMA support for HiFive Unleashed A00

 .../bindings/dma/sifive,fu540-c000-pdma.yaml  |  55 ++
 MAINTAINERS                                   |   6 +
 arch/riscv/boot/dts/sifive/fu540-c000.dtsi    |   7 +
 drivers/dma/Kconfig                           |   2 +
 drivers/dma/Makefile                          |   1 +
 drivers/dma/sf-pdma/Kconfig                   |   6 +
 drivers/dma/sf-pdma/Makefile                  |   1 +
 drivers/dma/sf-pdma/sf-pdma.c                 | 623 ++++++++++++++++++
 drivers/dma/sf-pdma/sf-pdma.h                 | 124 ++++
 9 files changed, 825 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml
 create mode 100644 drivers/dma/sf-pdma/Kconfig
 create mode 100644 drivers/dma/sf-pdma/Makefile
 create mode 100644 drivers/dma/sf-pdma/sf-pdma.c
 create mode 100644 drivers/dma/sf-pdma/sf-pdma.h