linux-kernel - [PATCH v2 0/2] MT8173 IOMMU 4GB MODE SUPPORT

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Date:	Mon, 14 Mar 2016 06:01:09 +0800
From:	Yong Wu <yong.wu@...iatek.com>
To:	Joerg Roedel <joro@...tes.org>,
	Robin Murphy <robin.murphy@....com>,
	Will Deacon <will.deacon@....com>
CC:	Matthias Brugger <matthias.bgg@...il.com>,
	Daniel Kurtz <djkurtz@...gle.com>,
	Tomasz Figa <tfiga@...gle.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Rob Herring <robh+dt@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	<linux-mediatek@...ts.infradead.org>,
	Sasha Hauer <kernel@...gutronix.de>,
	<srv_heupstream@...iatek.com>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<iommu@...ts.linux-foundation.org>, <arnd@...db.de>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	<youhua.li@...iatek.com>, <milton.chiang@...iatek.com>
Subject: [PATCH v2 0/2] MT8173 IOMMU 4GB MODE SUPPORT

This patch-set add MTK 4GB mode support on the Short-Descriptor.

Normally, the memory map in mt8173 looks like below:

Physical addr
| 1st GB |    ->  HW SRAM and Regs
|--------
| 2nd GB |    ->  Dram 1st GB
|--------
| 3rd GB |    ->  Dram 2nd GB
|--------
| 4th GB |    ->  Dram 3rd GB
|--------

Then if the dram size is 4GB, we have to add bit33 in the physical
address. We have a "DRAM 4GB mode" toggle bit for this.
If it is enabled, from CPU's point of view, the dram will
be shifted to start from PA 0x1_00000000. Then the dram PA is from
0x1_00000000~0x1_ffffffff.

MTK extend the bit9 of the standard pgtable descriptor as the 4GB mode.
we add a special quirk for this.

v2:
- Rebase on next-20160310.
- Rename IO_PGTABLE_QUIRK_MTK_4GB_EXT to IO_PGTABLE_QUIRK_ARM_MTK_4GB.
- Improve the comment of this "4GB mode".

Yong Wu (2):
  iommu/io-pgtable: Add MTK 4GB mode in Short-descriptor
  iommu/mediatek: Add 4GB mode support

 drivers/iommu/io-pgtable-arm-v7s.c | 13 ++++++++++++-
 drivers/iommu/io-pgtable.h         |  6 ++++++
 drivers/iommu/mtk_iommu.c          | 14 +++++++++++---
 3 files changed, 29 insertions(+), 4 deletions(-)

-- 
1.8.1.1.dirty