[PATCH v3 0/5] MT2701 iommu support

From: honghui.zhang
Date: Fri May 27 2016 - 04:57:57 EST

From: Honghui Zhang <honghui.zhang@xxxxxxxxxxxx>

Mediatek's m4u(Multimedia Memory Management Unit) and SMI(Smart
Multimedia Interface)have two generations HW. They basically sharing the
same hardware block diagram, but have some difference as below:

Generation one m4u only supports one layer, flat pagetable addressing,
and only supports 4K size page mapping. While generation two m4u supports 2
levels of pagetable which uses the ARM short-descriptor translation table
format for address translation.
They have slight different register base and register offset.
They have very different HW ports defines.

Generaion one SMI has additional "async" clock which transform the smi
clock into emi clock domain, this clock should be prepared and enabled for
SMI generation one HW.
The register which control the iommu need to translation the address or not
for a particular port is located at smi ao base(smi always on register
base) for generation one SMI HW, but located at each larb's register base
for generation two HW.

This patch set add mt2701 iommu support, it's based on 4.6-rc1 and James
Liao's "Add clock support for Mediatek MT2701 v8[1]" and "Mediatek MT2701
SCPSYS power domain support v7[2]" patch.

-Rebase on "of: Implement iterator for phandles[3]" and take use of
-Forward-declare mtk_iommu_domain and implement the struct separately.
-Free the pagetable memory in mtk_iommu_domain_free
-Roll back the mapping in error case.
-Minor cleanups.

v2: https://lists.linuxfoundation.org/pipermail/iommu/2016-May/017068.html
-Fix syntax errors in dt-bindings.
-Use dma_alloc/free_coherent to allocate pagetable memory and reduce the
streaming DMA stuff.
-Make the mtk_iommu_ops.pgsize_bitmap as ~0UL << MT2701_IOMMU_PAGE_SHIFT.
-Use macro instead of variable to indicate the pagetable size.
-Change some macro name from MTK_XXX to MT2701_XXX.

v1: http://lists.infradead.org/pipermail/linux-mediatek/2016-May/005301.html
-initial version

[1] http://lists.infradead.org/pipermail/linux-mediatek/2016-May/005439.html
[2] http://lists.infradead.org/pipermail/linux-mediatek/2016-May/005429.html
[3] https://lists.linuxfoundation.org/pipermail/iommu/2016-April/016300.html

Honghui Zhang (5):
dt-bindings: mediatek: add descriptions for mediatek mt2701 iommu and
iommu/mediatek: move the common struct into header file
memory/mediatek: add support for mt2701
iommu/mediatek: add support for mtk iommu generation one HW
ARM: dts: mt2701: add iommu/smi dtsi node for mt2701

.../devicetree/bindings/iommu/mediatek,iommu.txt | 13 +-
.../memory-controllers/mediatek,smi-common.txt | 21 +-
.../memory-controllers/mediatek,smi-larb.txt | 4 +-
arch/arm/boot/dts/mt2701.dtsi | 51 ++
drivers/iommu/Kconfig | 18 +
drivers/iommu/Makefile | 1 +
drivers/iommu/mtk_iommu.c | 48 +-
drivers/iommu/mtk_iommu.h | 77 +++
drivers/iommu/mtk_iommu_v1.c | 728 +++++++++++++++++++++
drivers/memory/mtk-smi.c | 168 ++++-
include/dt-bindings/memory/mt2701-larb-port.h | 85 +++
11 files changed, 1140 insertions(+), 74 deletions(-)
create mode 100644 drivers/iommu/mtk_iommu.h
create mode 100644 drivers/iommu/mtk_iommu_v1.c
create mode 100644 include/dt-bindings/memory/mt2701-larb-port.h