[PATCH v2 0/2] dmaengine: avalon: Support Avalon-MM DMA Interface for PCIe

[Alexander Gordeev]

This series is against v5.4-rc2

Changes since v1:
- "avalon-dma" converted to "dmaengine" model;
- "avalon-drv" renamed to "avalon-test";

The Avalon-MM DMA Interface for PCIe is a design used in hard IPs for
Intel Arria, Cyclone or Stratix FPGAs. It transfers data between on-chip
memory and system memory.

Patch 1. This patch introduces "avalon-dma" driver that conforms to
"dmaengine" model.

Patch 2. The existing "dmatest" is not meant for DMA_SLAVE type of
transfers needed by "avalon-dma". Instead, custom "avalon-test" driver
was used to debug and stress "avalon-dma". If it could be useful for a
wider audience, I can make it optional part of "avalon-dma" sources or
leave it as separate driver. Marking patch 2 as RFC for now.

Testing was done using a custom FPGA build with Arria 10 FPGA streaming
data to target device RAM:

  +----------+    +----------+    +----------+        +----------+
  | Nios CPU |<-->|   RAM    |<-->|  Avalon  |<-PCIe->| Host CPU |
  +----------+    +----------+    +----------+        +----------+

The RAM was examined for data integrity by examining RAM contents
from host CPU (indirectly - checking data DMAed to the system) and
from Nios CPU that has direct access to the device RAM. A companion
tool using "avalon-test" driver was used to DMA files to the device:
https://github.com/a-gordeev/avalon-tool.git

CC: Michael Chen <micchen@xxxxxxxxxx>
CC: devel@xxxxxxxxxxxxxxxxxxxx
CC: dmaengine@xxxxxxxxxxxxxxx

Alexander Gordeev (2):
  dmaengine: avalon: Intel Avalon-MM DMA Interface for PCIe
  dmaengine: avalon: Intel Avalon-MM DMA Interface for PCIe test

 drivers/dma/Kconfig                     |   3 +
 drivers/dma/Makefile                    |   2 +
 drivers/dma/avalon-test/Kconfig         |  23 +
 drivers/dma/avalon-test/Makefile        |  14 +
 drivers/dma/avalon-test/avalon-dev.c    |  65 +++
 drivers/dma/avalon-test/avalon-dev.h    |  33 ++
 drivers/dma/avalon-test/avalon-ioctl.c  | 128 +++++
 drivers/dma/avalon-test/avalon-ioctl.h  |  12 +
 drivers/dma/avalon-test/avalon-mmap.c   |  93 ++++
 drivers/dma/avalon-test/avalon-mmap.h   |  12 +
 drivers/dma/avalon-test/avalon-sg-buf.c | 132 +++++
 drivers/dma/avalon-test/avalon-sg-buf.h |  26 +
 drivers/dma/avalon-test/avalon-util.c   |  54 ++
 drivers/dma/avalon-test/avalon-util.h   |  12 +
 drivers/dma/avalon-test/avalon-xfer.c   | 697 ++++++++++++++++++++++++
 drivers/dma/avalon-test/avalon-xfer.h   |  28 +
 drivers/dma/avalon/Kconfig              |  88 +++
 drivers/dma/avalon/Makefile             |   6 +
 drivers/dma/avalon/avalon-core.c        | 432 +++++++++++++++
 drivers/dma/avalon/avalon-core.h        |  90 +++
 drivers/dma/avalon/avalon-hw.c          | 212 +++++++
 drivers/dma/avalon/avalon-hw.h          |  86 +++
 drivers/dma/avalon/avalon-pci.c         | 150 +++++
 include/uapi/linux/avalon-ioctl.h       |  32 ++
 24 files changed, 2430 insertions(+)
 create mode 100644 drivers/dma/avalon-test/Kconfig
 create mode 100644 drivers/dma/avalon-test/Makefile
 create mode 100644 drivers/dma/avalon-test/avalon-dev.c
 create mode 100644 drivers/dma/avalon-test/avalon-dev.h
 create mode 100644 drivers/dma/avalon-test/avalon-ioctl.c
 create mode 100644 drivers/dma/avalon-test/avalon-ioctl.h
 create mode 100644 drivers/dma/avalon-test/avalon-mmap.c
 create mode 100644 drivers/dma/avalon-test/avalon-mmap.h
 create mode 100644 drivers/dma/avalon-test/avalon-sg-buf.c
 create mode 100644 drivers/dma/avalon-test/avalon-sg-buf.h
 create mode 100644 drivers/dma/avalon-test/avalon-util.c
 create mode 100644 drivers/dma/avalon-test/avalon-util.h
 create mode 100644 drivers/dma/avalon-test/avalon-xfer.c
 create mode 100644 drivers/dma/avalon-test/avalon-xfer.h
 create mode 100644 drivers/dma/avalon/Kconfig
 create mode 100644 drivers/dma/avalon/Makefile
 create mode 100644 drivers/dma/avalon/avalon-core.c
 create mode 100644 drivers/dma/avalon/avalon-core.h
 create mode 100644 drivers/dma/avalon/avalon-hw.c
 create mode 100644 drivers/dma/avalon/avalon-hw.h
 create mode 100644 drivers/dma/avalon/avalon-pci.c
 create mode 100644 include/uapi/linux/avalon-ioctl.h

-- 
2.23.0