Re: [PATCH 0/3] dmaengine: dw-edma: Add support for native HDMA

Serge Semin
2022-09-25T17:34:22Z

On Wed, Sep 21, 2022 at 02:48:49PM +0800, Cai Huoqing wrote:
> From: caihuoqing <caihuoqing@baidu.com>
>
> Add support for HDMA NATIVE, as long the IP design has set
> the compatible register map parameter-HDMA_NATIVE,
> which allows compatibility for native HDMA register configuration.
>
> The HDMA Hyper-DMA IP is an enhancement of the eDMA embedded-DMA IP.
> And the native HDMA registers are different from eDMA,
> so this patch add support for HDMA NATIVE mode.
>
> HDMA write and read channels operate independently to maximize
> the performance of the HDMA read and write data transfer over
> the link When you configure the HDMA with multiple read channels,
> then it uses a round robin (RR) arbitration scheme to select
> the next read channel to be serviced.
> The same applies when you have multiple write channels.
>
> The native HDMA driver also supports a maximum of 16 independent
> channels (8 write + 8 read), which can run simultaneously.
> Both SAR (Source Address Register) and DAR (Destination Address Register)
> are alignmented to byte.dmaengine: dw-edma: Add support for native HDMA
>
> These series based on the series
> https://lore.kernel.org/dmaengine/20220822185332.26149-1-Sergey.Semin@baikalelectronics.ru/

Great! Thanks for rebasing on top of my series. I'll have a look at
your patchset in several weeks (two or most likely three) since the
next merge window is upon us and neither mine nor your patchset will
get into the Bjorn/Vinod repos before that anyway.

-Sergey

>
> Cai Huoqing (3):
> dmaengine: dw-edma: Rename dw_edma_core_ops structure to
> dw_edma_plat_ops
> dmaengine: dw-edma: Create a new dw_edma_core_ops structure to
> abstract controller operation
> dmaengine: dw-edma: Add support for native HDMA
>
> drivers/dma/dw-edma/Makefile | 6 +-
> drivers/dma/dw-edma/dw-edma-core.c | 65 ++---
> drivers/dma/dw-edma/dw-edma-core.h | 19 ++
> drivers/dma/dw-edma/dw-edma-pcie.c | 4 +-
> drivers/dma/dw-edma/dw-edma-v0-core.c | 90 ++++++-
> drivers/dma/dw-edma/dw-edma-v0-core.h | 14 +-
> drivers/dma/dw-edma/dw-hdma-v0-core.c | 304 +++++++++++++++++++++++
> drivers/dma/dw-edma/dw-hdma-v0-core.h | 17 ++
> drivers/dma/dw-edma/dw-hdma-v0-debugfs.c | 150 +++++++++++
> drivers/dma/dw-edma/dw-hdma-v0-debugfs.h | 22 ++
> drivers/dma/dw-edma/dw-hdma-v0-regs.h | 98 ++++++++
> include/linux/dma/edma.h | 7 +-
> 12 files changed, 725 insertions(+), 71 deletions(-)
> create mode 100644 drivers/dma/dw-edma/dw-hdma-v0-core.c
> create mode 100644 drivers/dma/dw-edma/dw-hdma-v0-core.h
> create mode 100644 drivers/dma/dw-edma/dw-hdma-v0-debugfs.c
> create mode 100644 drivers/dma/dw-edma/dw-hdma-v0-debugfs.h
> create mode 100644 drivers/dma/dw-edma/dw-hdma-v0-regs.h
>
> --
> 2.25.1
>