[PATCH v4 00/07] MT6779 IOMMU SUPPORT

[Chao Hao <chao.hao@mediatek.com>]

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:
 v4:
   1. Rebase on v5.8-rc1.
   2. Fix coding style.
   3. Add F_MMU_IN_DRDER_WR_EN definition in MISC_CTRL to improve performance.

 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.

 http://lists.infradead.org/pipermail/linux-mediatek/2020-May/029811.html

 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: Set MISC_CTRL register
  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                     |  92 ++++++--
 drivers/iommu/mtk_iommu.h                     |  10 +-
 include/dt-bindings/memory/mt6779-larb-port.h | 206 ++++++++++++++++++
 4 files changed, 285 insertions(+), 25 deletions(-)

--
2.18.0