linux-kernel - [PATCH v3 0/4] dmaengine: dw-edma: Add support for native HDMA

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Date:   Mon, 13 Feb 2023 21:24:05 +0800
From:   Cai Huoqing <cai.huoqing@...ux.dev>
To:     Sergey.Semin@...kalelectronics.ru
Cc:     Cai huoqing <cai.huoqing@...ux.dev>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Vinod Koul <vkoul@...nel.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: [PATCH v3 0/4] dmaengine: dw-edma: Add support for native HDMA

From: Cai huoqing <cai.huoqing@...ux.dev>

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

Cai huoqing (4):
  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
  dmaengine: dw-edma: Add HDMA DebugFS support

  v2->v3:
    [1/4]
    1.Add more commit log to explain why use dw_edma_plat_ops.
    2.Update the structure name in the DW PCIe driver.
    [2/4]
    3.Use the reverse xmas tree vars definition order.
    4.Add edma core ops wrapper.
    5.Add dw_edma_done_interrupt() and dw_edma_abort_interrupt()
      global methods.
    6.Fix some indentation.
    7.Fix some typo
    8.Make use off dw_edma_core prefix instead of dw_xdma_core_.
    [3/4]
    9.Remove unnecessary include: dw-edma-v0-regs.h and dw-edma-v0-regs.h
    10.HDMA supports the LL descriptors placed on the CPU memory.
    [4/4]
    11.Split DebugFS to be a separate patch.
    12.Refactor HDMA DebugFS like the series in @Bjorn tree.

  v2 link:
  https://lore.kernel.org/lkml/20220925173412.u2ez6rbmfc5fupdn@mobilestation/

 drivers/dma/dw-edma/Makefile                 |   8 +-
 drivers/dma/dw-edma/dw-edma-core.c           |  63 ++--
 drivers/dma/dw-edma/dw-edma-core.h           |  92 ++++++
 drivers/dma/dw-edma/dw-edma-pcie.c           |   4 +-
 drivers/dma/dw-edma/dw-edma-v0-core.c        |  88 ++++-
 drivers/dma/dw-edma/dw-edma-v0-core.h        |  14 +-
 drivers/dma/dw-edma/dw-hdma-v0-core.c        | 317 +++++++++++++++++++
 drivers/dma/dw-edma/dw-hdma-v0-core.h        |  17 +
 drivers/dma/dw-edma/dw-hdma-v0-debugfs.c     | 175 ++++++++++
 drivers/dma/dw-edma/dw-hdma-v0-debugfs.h     |  22 ++
 drivers/dma/dw-edma/dw-hdma-v0-regs.h        | 129 ++++++++
 drivers/pci/controller/dwc/pcie-designware.c |   2 +-
 include/linux/dma/edma.h                     |   7 +-
 13 files changed, 860 insertions(+), 78 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

-- 
2.34.1