linux-kernel - [PATCH v3 00/07] MT6779 IOMMU SUPPORT

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Date:   Sat, 9 May 2020 16:36:47 +0800
From:   Chao Hao <chao.hao@...iatek.com>
To:     Joerg Roedel <joro@...tes.org>, Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     <iommu@...ts.linux-foundation.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <wsd_upstream@...iatek.com>,
        Chao Hao <chao.hao@...iatek.com>,
        Yong Wu <yong.wu@...iatek.com>, FY Yang <fy.yang@...iatek.com>,
        Jun Yan <jun.yan@...iatek.com>
Subject: [PATCH v3 00/07] MT6779 IOMMU SUPPORT

This patchset adds mt6779 iommu support.

mt6779 has two iommus, they are MM_IOMMU(M4U) and APU_IOMMU which used ARM Short-Descriptor translation format.
The mt6779's MM_IOMMU-SMI and APU_IOMMU HW diagram is as below, it is only a brief diagram:

                             EMI
			      |
	   --------------------------------------
	   |                                    |
       MM_IOMMU                            APU_IOMMU
           |                                    |
       SMI_COMMOM-----------                 APU_BUS
           |                |                   |
      SMI_LARB(0~11)        |                   |
           |                |                   |
           |                |             --------------
           |                |             |     |      |
    Multimedia engine      CCU           VPU   MDLA   EMDA

All the connections are hardware fixed, software can not adjust it.

Compared with mt8183, SMI_BUS_ID width has changed from 10 to 12. SMI Larb number is described in bit[11:7],
Port number is described in bit[6:2]. In addition, there are some registers has changed in mt6779, so we need
to redefine and reuse them.

The patchset only used MM_IOMMU, so we only add MM_IOMMU basic function, such as smi_larb port definition, registers
definition and hardware initialization.

change notes:
 v3:
  1. Rebase on v5.7-rc1.
  2. Remove unused port definition,ex:APU and CCU port in mt6779-larb-port.h.
  3. Remove "change single domain to multiple domain" part(from PATCH v2 09/19 to PATCH v2 19/19).
  4. Redesign mt6779 basic part
   (1)Add some register definition and reuse them.
   (2)Redesign smi larb bus ID to analyze IOMMU translation fault.
   (3)Only init MM_IOMMU and not use APU_IOMMU.

 v2:
  1. Rebase on v5.5-rc1.
  2. Delete M4U_PORT_UNKNOWN define because of not use it.
  3. Correct coding format.
  4. Rename offset=0x48 register.
  5. Split "iommu/mediatek: Add mt6779 IOMMU basic support(patch v1)" to several patches(patch v2).

  http://lists.infradead.org/pipermail/linux-mediatek/2020-January/026131.html

 v1:
  http://lists.infradead.org/pipermail/linux-mediatek/2019-November/024567.html

Chao Hao (7):
  dt-bindings: mediatek: Add bindings for MT6779
  iommu/mediatek: Rename the register STANDARD_AXI_MODE(0x48) to
                  MISC_CTRL
  iommu/mediatek: Disable STANDARD_AXI_MODE in MISC_CTRL
  iommu/mediatek: Move inv_sel_reg into the plat_data
  iommu/mediatek: Add sub_comm id in translation fault
  iommu/mediatek: Add REG_MMU_WR_LEN definition preparing for mt6779
  iommu/mediatek: Add mt6779 basic support

 .../bindings/iommu/mediatek,iommu.txt         |   2 +
 drivers/iommu/mtk_iommu.c                     |  77 +++++--
 drivers/iommu/mtk_iommu.h                     |  10 +-
 include/dt-bindings/memory/mt6779-larb-port.h | 206 ++++++++++++++++++
 4 files changed, 273 insertions(+), 22 deletions(-)

--
2.18.0