From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/5] iommu/mediatek: Add mt8173 IOMMU driver
Date: Tue, 17 Mar 2015 15:14:24 +0000 [thread overview]
Message-ID: <20150317151424.GQ8399@arm.com> (raw)
In-Reply-To: <1425903103.13300.29.camel@mhfsdcap03>
On Mon, Mar 09, 2015 at 12:11:43PM +0000, Yong Wu wrote:
> On Fri, 2015-03-06 at 10:58 +0000, Will Deacon wrote:
> > On Fri, Mar 06, 2015 at 10:48:17AM +0000, yong.wu at mediatek.com wrote:
> > > From: Yong Wu <yong.wu@mediatek.com>
> > >
> > > This patch adds support for mediatek m4u (MultiMedia Memory Management Unit).
> > > Currently this only supports m4u gen 2 with 2 levels of page table on mt8173.
> >
> > [...]
> >
> > > +/* 2 level pagetable: pgd -> pte */
> > > +#define F_PTE_TYPE_GET(regval) (regval & 0x3)
> > > +#define F_PTE_TYPE_LARGE BIT(0)
> > > +#define F_PTE_TYPE_SMALL BIT(1)
> > > +#define F_PTE_B_BIT BIT(2)
> > > +#define F_PTE_C_BIT BIT(3)
> > > +#define F_PTE_BIT32_BIT BIT(9)
> > > +#define F_PTE_S_BIT BIT(10)
> > > +#define F_PTE_NG_BIT BIT(11)
> > > +#define F_PTE_PA_LARGE_MSK (~0UL << 16)
> > > +#define F_PTE_PA_LARGE_GET(regval) ((regval >> 16) & 0xffff)
> > > +#define F_PTE_PA_SMALL_MSK (~0UL << 12)
> > > +#define F_PTE_PA_SMALL_GET(regval) ((regval >> 12) & (~0))
> > > +#define F_PTE_TYPE_IS_LARGE_PAGE(pte) ((imu_pte_val(pte) & 0x3) == \
> > > + F_PTE_TYPE_LARGE)
> > > +#define F_PTE_TYPE_IS_SMALL_PAGE(pte) ((imu_pte_val(pte) & 0x3) == \
> > > + F_PTE_TYPE_SMALL)
> >
> > This looks like the ARM short-descriptor format to me. Could you please
> > add a new page table format to the io-pgtable code, so that other IOMMU
> > drivers can make use of this? I know there was some interest in using
> > short descriptor for the ARM SMMU, for example.
> Currently I not familiar with the io-pgtable,I may need some time
> for it and the ARM short-descriptor.
Well, you can read the LPAE version I wrote in io-pgtable-arm.c for some
inspiration (it's used by arm-smmu.c and ipmmu-vmsa.c).
> And there are some difference between mediatek's pagetable with the
> standard short-descriptor, like bit 9. we use it for the dram over 4GB.
> Then how should we do if there are some difference.
That can easily be handled using a quirk (see, for example,
IO_PGTABLE_QUIRK_ARM_NS).
Will
next prev parent reply other threads:[~2015-03-17 15:14 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-06 10:48 [RFC PATCH 0/5] MT8173 IOMMU support yong.wu at mediatek.com
2015-03-06 10:48 ` [PATCH 1/5] soc: mediatek: Add SMI driver yong.wu at mediatek.com
2015-03-06 11:30 ` Paul Bolle
2015-03-09 11:57 ` Yong Wu
2015-03-09 17:59 ` Paul Bolle
2015-03-09 21:54 ` Arnd Bergmann
2015-03-10 6:17 ` Yingjoe Chen
2015-03-09 3:26 ` Yingjoe Chen
2015-03-09 21:56 ` Arnd Bergmann
2015-03-10 6:27 ` Yingjoe Chen
2015-03-10 9:05 ` Arnd Bergmann
2015-03-10 9:24 ` Lucas Stach
2015-03-09 11:03 ` Sascha Hauer
2015-03-06 10:48 ` [PATCH 2/5] iommu/mediatek: Add mt8173 IOMMU driver yong.wu at mediatek.com
2015-03-06 10:58 ` Will Deacon
2015-03-09 12:11 ` Yong Wu
2015-03-17 15:14 ` Will Deacon [this message]
2015-03-06 17:15 ` Mitchel Humpherys
2015-03-09 12:16 ` Yong Wu
2015-03-09 16:57 ` Mitchel Humpherys
2015-03-08 4:12 ` Tomasz Figa
2015-03-12 14:16 ` Yong Wu
2015-03-09 8:24 ` Daniel Kurtz
2015-03-09 11:11 ` Tomasz Figa
2015-03-09 14:46 ` Yingjoe Chen
2015-03-09 17:00 ` Tomasz Figa
2015-03-10 3:41 ` Yingjoe Chen
2015-03-10 4:06 ` Tomasz Figa
2015-03-11 10:53 ` Tomasz Figa
2015-03-18 11:22 ` Yong Wu
2015-03-20 19:14 ` Robin Murphy
2015-04-14 6:50 ` Yong Wu
2015-03-27 9:41 ` Tomasz Figa
2015-04-14 6:31 ` Yong Wu
2015-04-15 2:20 ` Tomasz Figa
2015-04-15 7:06 ` Yong Wu
2015-04-15 7:41 ` Tomasz Figa
2015-04-29 6:23 ` Yong Wu
2015-03-06 10:48 ` [PATCH 3/5] dt-bindings: mediatek: Add smi dts binding yong.wu at mediatek.com
2015-03-06 11:13 ` Mark Rutland
2015-03-09 12:55 ` Yong Wu
2015-04-14 9:07 ` Yong Wu
2015-04-14 10:06 ` Mark Rutland
2015-04-14 13:49 ` Yong Wu
2015-04-14 13:55 ` Yong Wu
2015-04-14 13:56 ` Mark Rutland
2015-03-06 14:48 ` Sergei Shtylyov
2015-03-09 12:32 ` Yong Wu
2015-03-06 10:48 ` [PATCH 4/5] dt-bindings: iommu: Add binding for mediatek IOMMU yong.wu at mediatek.com
2015-03-06 11:21 ` Mark Rutland
2015-03-09 11:30 ` Yong Wu
2015-03-06 10:48 ` [PATCH 5/5] dts: mt8173: Add iommu/smi nodes for mt8173 yong.wu at mediatek.com
2015-03-07 15:20 ` Daniel Kurtz
2015-03-09 12:18 ` Yong Wu
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