The Avalon-MM DMA Interface for PCIe is a design found in hard IPs for Intel Arria, Cyclone or Stratix FPGAs. It transfers data between on-chip memory and system memory. This RFC is an attempt to provide a generic API: typedef void (*avalon_dma_xfer_callback)(void *dma_async_param); int avalon_dma_submit_xfer( struct avalon_dma *avalon_dma, enum dma_data_direction direction, dma_addr_t dev_addr, dma_addr_t host_addr, unsigned int size, avalon_dma_xfer_callback callback, void *callback_param); int avalon_dma_submit_xfer_sg(struct avalon_dma *avalon_dma, enum dma_data_direction direction, dma_addr_t dev_addr, struct sg_table *sg_table, avalon_dma_xfer_callback callback, void *callback_param); int avalon_dma_issue_pending(struct avalon_dma *avalon_dma); Patch 1 introduces "avalon-dma" driver that provides the above-mentioned generic interface. Patch 2 adds "avalon-drv" driver using "avalon-dma" to transfer user- provided data. This driver was used to debug and stress "avalon-dma" and could be used as a code base for other implementations. Strictly speaking, it does not need to be part of the kernel tree. A companion tool using "avalon-drv" to DMA files (not part of this patchset) is located at git@xxxxxxxxxx:a-gordeev/avalon-drv-tool.git The suggested interface is developed with the standard "dmaengine" in mind and could be reworked to suit it. I would appreciate, however gathering some feedback on the implemenation first - as the hardware- specific code would persist. It is also a call for testing - I only have access to a single Arria 10 device to try on. This series is against v5.3 and could be found at git@xxxxxxxxxx:a-gordeev/linux.git avalon-dma-engine CC: Michael Chen <micchen@xxxxxxxxxx> CC: devel@xxxxxxxxxxxxxxxxxxxx CC: dmaengine@xxxxxxxxxxxxxxx Alexander Gordeev (2): staging: avalon-dma: Avalon DMA engine staging: avalon-drv: Avalon DMA driver drivers/staging/Kconfig | 4 + drivers/staging/Makefile | 2 + drivers/staging/avalon-dma/Kconfig | 45 ++ drivers/staging/avalon-dma/Makefile | 11 + drivers/staging/avalon-dma/avalon-dma-core.c | 515 ++++++++++++++ drivers/staging/avalon-dma/avalon-dma-core.h | 52 ++ .../staging/avalon-dma/avalon-dma-interrupt.c | 118 ++++ .../staging/avalon-dma/avalon-dma-interrupt.h | 13 + drivers/staging/avalon-dma/avalon-dma-util.c | 196 ++++++ drivers/staging/avalon-dma/avalon-dma-util.h | 25 + drivers/staging/avalon-drv/Kconfig | 34 + drivers/staging/avalon-drv/Makefile | 14 + drivers/staging/avalon-drv/avalon-drv-dev.c | 193 ++++++ drivers/staging/avalon-drv/avalon-drv-ioctl.c | 137 ++++ drivers/staging/avalon-drv/avalon-drv-ioctl.h | 12 + drivers/staging/avalon-drv/avalon-drv-mmap.c | 93 +++ drivers/staging/avalon-drv/avalon-drv-mmap.h | 12 + .../staging/avalon-drv/avalon-drv-sg-buf.c | 132 ++++ .../staging/avalon-drv/avalon-drv-sg-buf.h | 26 + drivers/staging/avalon-drv/avalon-drv-util.c | 54 ++ drivers/staging/avalon-drv/avalon-drv-util.h | 12 + drivers/staging/avalon-drv/avalon-drv-xfer.c | 655 ++++++++++++++++++ drivers/staging/avalon-drv/avalon-drv-xfer.h | 24 + drivers/staging/avalon-drv/avalon-drv.h | 22 + include/linux/avalon-dma-hw.h | 72 ++ include/linux/avalon-dma.h | 68 ++ include/uapi/linux/avalon-drv-ioctl.h | 30 + 27 files changed, 2571 insertions(+) create mode 100644 drivers/staging/avalon-dma/Kconfig create mode 100644 drivers/staging/avalon-dma/Makefile create mode 100644 drivers/staging/avalon-dma/avalon-dma-core.c create mode 100644 drivers/staging/avalon-dma/avalon-dma-core.h create mode 100644 drivers/staging/avalon-dma/avalon-dma-interrupt.c create mode 100644 drivers/staging/avalon-dma/avalon-dma-interrupt.h create mode 100644 drivers/staging/avalon-dma/avalon-dma-util.c create mode 100644 drivers/staging/avalon-dma/avalon-dma-util.h create mode 100644 drivers/staging/avalon-drv/Kconfig create mode 100644 drivers/staging/avalon-drv/Makefile create mode 100644 drivers/staging/avalon-drv/avalon-drv-dev.c create mode 100644 drivers/staging/avalon-drv/avalon-drv-ioctl.c create mode 100644 drivers/staging/avalon-drv/avalon-drv-ioctl.h create mode 100644 drivers/staging/avalon-drv/avalon-drv-mmap.c create mode 100644 drivers/staging/avalon-drv/avalon-drv-mmap.h create mode 100644 drivers/staging/avalon-drv/avalon-drv-sg-buf.c create mode 100644 drivers/staging/avalon-drv/avalon-drv-sg-buf.h create mode 100644 drivers/staging/avalon-drv/avalon-drv-util.c create mode 100644 drivers/staging/avalon-drv/avalon-drv-util.h create mode 100644 drivers/staging/avalon-drv/avalon-drv-xfer.c create mode 100644 drivers/staging/avalon-drv/avalon-drv-xfer.h create mode 100644 drivers/staging/avalon-drv/avalon-drv.h create mode 100644 include/linux/avalon-dma-hw.h create mode 100644 include/linux/avalon-dma.h create mode 100644 include/uapi/linux/avalon-drv-ioctl.h -- 2.22.0 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
