[PATCH v6 00/12] iommu/exynos: Fixes and Enhancements of System MMU driver with DT

KyongHo Cho pullip.cho at samsung.com
Mon Jan 7 05:45:47 EST 2013


2013. 1. 4. 오전 8:32에 "Sylwester Nawrocki" <sylvester.nawrocki at gmail.com>님이
작성:
>
> Hi,
>
> Cc: devicetree-discuss <devicetree-discuss at lists.ozlabs.org>
>
>
> On 12/26/2012 02:53 AM, Cho KyongHo wrote:
>>
>> notice: v6 patch-set is rebased on next/iommu-exynos branch of
>> linux-samsung.git.  This patch-set does not include 2 patches (05 and 06
>> patches in v5 patch-se) because they alread exist already in the branch.
>>
>> The current exynos-iommu(System MMU) driver does not work autonomously
>> since it is lack of support for power management of peripheral blocks.
>> For example, MFC device driver must ensure that its System MMU is
disabled
>> before MFC block is power-down not to invalidate IOTLB in the System MMU
>> when I/O memory mapping is changed. Because A System MMU is resides in
the
>> same H/W block, access to control registers of System MMU while the H/W
>> block is turned off must be prohibited.
>>
>> This set of changes solves the above problem with setting each System
MMUs
>> as the parent of the device which owns the System MMU to recieve the
>> information when the device is turned off or turned on.
>
>
> I intend to make Exynos4412 FIMC-LITEn (Exynos5 CAMIFn) devices child
> devices of the FIMC-IS (camera ISP) platform device. This patch reflects
> that: http://patchwork.linuxtv.org/patch/16046
>
> This is required since AFAIK FIMC-LITE depends on clocks from FIMC-IS.
> By setting fimc-is device as the parent fimc-lite's dependency on it is
> resolved without any hacks between these drivers.
>
> Then how this tree will look like after your sysmmu related re-parenting:
>
>          fimc-is
>         /      \
>  fimc-lite0    fimc-lite1
>
>
> ?

First of all, I think that clock dependency shuold be resolved with setting
the parent of clock descriptor of fimc-lite  to the clock descriptor of
fimc-is.
If you are concerning about power management, it is simply resolved with
putting fimc-lite to the power domain of fimc-is.
The above tree will be changed like below after probing System MMU:
sysmmu-fimc-is
            I
     fimc-is

sysmmu-fimc-lite0
              I
      fimc-lite0

sysmmu-fimc-lite1
             I
       fimc-lite1

>> Another big change to the driver is the support for devicetree.
>> The bindings for System MMU is described in
>> Documentation/devicetree/bindings/arm/samsung/system-mmu.txt
>
>
> Yes, and there is no patch adding this file in this series. Let me paste
> it here:
>
> From 88987ff5b77acc7211b9f537a6ef6ea38e3efdd0 Mon Sep 17 00:00:00 2001
> From: KyongHo Cho <pullip.cho at samsung.com>
> Date: Tue, 11 Dec 2012 14:06:25 +0900
> Subject: [PATCH] ARM: EXYNOS: add System MMU definition to DT
>
> This commit adds System MMU nodes to DT of Exynos SoCs.
>
> Signed-off-by: KyongHo Cho <pullip.cho at samsung.com>
> Signed-off-by: Kukjin Kim <kgene.kim at samsung.com>
> ---
>  .../devicetree/bindings/arm/exynos/system-mmu.txt  |   86 ++++++++++++
>  arch/arm/boot/dts/exynos4210.dtsi                  |   96 +++++++++++++
>  arch/arm/boot/dts/exynos4x12.dtsi                  |  124
+++++++++++++++++
>  arch/arm/boot/dts/exynos5250.dtsi                  |  147
+++++++++++++++++++-
>  4 files changed, 451 insertions(+), 2 deletions(-)
>  create mode 100644
Documentation/devicetree/bindings/arm/exynos/system-mmu.txt
>
> diff --git a/Documentation/devicetree/bindings/arm/exynos/system-mmu.txt
b/Documentation/devicetree/bindings/arm/exynos/system-mmu.txt
> new file mode 100644
> index 0000000..b33d682
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/exynos/system-mmu.txt
> @@ -0,0 +1,86 @@
> +* Samsung Exynos System MMU
> +
> +Samsung's Exynos architecture includes System MMU that enables scattered
> +physical chunks to be visible as a contiguous region to DMA-capabile
peripheral
> +devices like MFC, FIMC, FIMD, GScaler, FIMC-IS and so forth.
> +
> +System MMU is a sort of IOMMU and support identical translation table
format to
> +ARMv7 translation tables with minimum set of page properties including
access
> +permissions, shareability and security protection. In addition System
MMU has
> +another capabilities like L2 TLB or block-fetch buffers to minimize
translation
> +latency
> +
> +Each System MMU is included in the H/W block of a peripheral device.
Thus, it is
> +important to specify that a System MMU is dedicated to which peripheral
device
> +before using System MMU. System initialization must specify the
relationships
> +between a System MMU and a peripheral device that owns the System MMU.
> +
> +Some device drivers may control several peripheral devices with a single
device
> +descriptor like MFC. Since handling a System MMU with IOMMU API requires
a
> +device descriptor that needs the System MMU, it is best to combine the
System
> +MMUs of the peripheral devices and control them with a single System MMU
device
> +descriptor. If it is unable to combine them into a single device
descriptor,
> +they can be linked with each other by the means of device.parent
relationship.
> +
> +Required properties:
> +- compatible: Should be "samsung,exynos-sysmmu".
> +- reg: Tuples of base address and size of System MMU registers. The
number of
> +       tuples can be more than one if two or more System MMUs are
controlled
> +       by a single device descriptor.
> +- interrupt-parent: The phandle of the interrupt controller of System MMU
> +- interrupts: Tuples of numbers that indicates the interrupt source. The
> +              number of elements in the tuple is dependent upon
> +             'interrupt-parent' property. The number of tuples in this
property
> +             must be the same with 'reg' property.
> +
> +Optional properties:
> +- mmuname: Strings of the name of System MMU for debugging purpose. The
number
> +          of strings must be the same with the number of tuples in 'reg'
> +          property.
>
> As commented on previous patch, this isn't something that belongs here.
> But for debugging you could probably retrieve this from the node name ?

Thank you for good idea. However mmuname is an array of strings, actually.
Anyway I agree with your opinion that 'mmuname' is not proper property of a
device node. I will remove it and substitute it with base register address
of a System MMU.
>
> +- mmu-master: phandle to the device node that owns System MMU. Only the
device
> +          that is specified whith this property can control System MMU
with
> +          IOMMU API.
> +
> +Examples:
> +
> +MFC has 2 System MMUs for each port that MFC is attached. Thus it seems
natural
> +to define 2 System MMUs for each port of the MFC:
> +
> +       sysmmu-mfc-l {
> +               mmuname = "mfc_l";
> +               reg = <0x11210000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <8 5>;
> +               mmu-master = <&mfc>;
> +       };
> +
> +       sysmmu-mfc-r {
> +               mmuname = "mfc_r";
> +               reg = <0x11200000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <6 2>;
> +               mmu-master = <&mfc>;
> +       };
> +
> +Actually, MFC device driver requires sub-devices that represents each
port and
> +above 'mmu-master' properties of sysmmu-mfc-l and sysmmu-mfc-r have the
phandles
> +to those sub-devices.
>
> I find this sentence really difficult to parse. This documentation should
talk
> about how the device is designed and represented, rather than about its
driver.
>
OK. I will trying to find another expression easy to understand.  Do you
have any suggestion?

> +However, it is also a good idea that treats the above System MMUs as one
System
> +MMU because those System MMUs are actually required by the MFC device:
> +
> +       sysmmu-mfc {
> +               mmuname = "mfc_l", "mfc_r";
> +               reg = <0x11210000 0x1000
> +                      0x11200000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <8 5
> +                             6 2>;
> +               mmu-master = <&mfc>;
> +       };
> +
> +If System MMU of MFC is defined like the above, the number of elements
and the
> +order of list in 'mmuname', 'reg' and 'interrupts' must be the same.
> diff --git a/arch/arm/boot/dts/exynos4210.dtsi
b/arch/arm/boot/dts/exynos4210.dtsi
> index e31bfc4..1c134b2 100644
> --- a/arch/arm/boot/dts/exynos4210.dtsi
> +++ b/arch/arm/boot/dts/exynos4210.dtsi
> @@ -76,4 +76,100 @@
>                 reg = <0x100C0000 0x100>;
>                 interrupts = <2 4>;
>         };
> +
> +       sysmmu-mfcL {
>
> This capitalization looks weird. How about just making it sysmmu-mfc-l ?
OK. That looks better.
>
> +               mmuname = "mfc_l";
> +               reg = <0x13620000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <5 5>;
> +       };
> +
> +       sysmmu-mfcR {
>
> and sysmmu-mfc-r ?
>
> Hmm, you actually have it defined this way for exynos5250...
Oh really I did. I will make it better.
>
> +               mmuname = "mfc_r";
> +               reg = <0x13630000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <5 6>;
> +       };
> +
> +       sysmmu-tv {
> +               mmuname = "tv";
> +               reg = <0x13E20000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <5 4>;
> +       };
> +
> +       sysmmu-fimc0 {
> +               mmuname = "fimc0";
> +               reg = <0x11A20000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <4 2>;
> +       };
> +
> +       sysmmu-fimc1 {
> +               mmuname = "fimc1";
> +               reg = <0x11A30000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <4 3>;
> +       };
> +
> +       sysmmu-fimc2 {
> +               mmuname = "fimc2";
> +               reg = <0x11A40000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <4 4>;
> +       };
> +
> +       sysmmu-fimc3 {
> +               mmuname = "fimc3";
> +               reg = <0x11A50000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <4 5>;
> +       };
> +
> +       sysmmu-jpeg {
> +               mmuname = "jpeg";
> +               reg = <0x11A60000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <4 6>;
> +       };
> +
> +       sysmmu-g2d {
> +               mmuname = "g2d";
> +               reg = <0x12A20000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <4 7>;
> +       };
> +
> +       sysmmu-rotator {
> +               mmuname = "rotator";
> +               reg = <0x12A30000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <5 0>;
> +       };
> +
> +       sysmmu-fimd0 {
> +               mmuname = "fimd0";
> +               reg = <0x11E20000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <5 2>;
> +       };
> +
> +       sysmmu-fimd1 {
> +               mmuname = "fimd1";
> +               reg = <0x12220000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <5 3>;
> +       };
>  };
> diff --git a/arch/arm/boot/dts/exynos4x12.dtsi
b/arch/arm/boot/dts/exynos4x12.dtsi
> index 179a62e..0c6d001 100644
> --- a/arch/arm/boot/dts/exynos4x12.dtsi
> +++ b/arch/arm/boot/dts/exynos4x12.dtsi
> @@ -66,4 +66,128 @@
>                 reg = <0x106E0000 0x1000>;
>                 interrupts = <0 72 0>;
>         };
> +
> +       sysmmu-mfcL {
> +               mmuname = "mfc_l";
> +               reg = <0x13620000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <5 5>;
> +       };
> +
> +       sysmmu-mfcR {
> +               mmuname = "mfc_r";
> +               reg = <0x13630000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <5 6>;
> +       };
> +
> +       sysmmu-tv {
> +               mmuname = "tv";
> +               reg = <0x13E20000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <5 4>;
> +       };
> +
> +       sysmmu-fimc0 {
> +               mmuname = "fimc0";
> +               reg = <0x11A20000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <4 2>;
> +       };
> +
> +       sysmmu-fimc1 {
> +               mmuname = "fimc1";
> +               reg = <0x11A30000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <4 3>;
> +       };
> +
> +       sysmmu-fimc2 {
> +               mmuname = "fimc2";
> +               reg = <0x11A40000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <4 4>;
> +       };
> +
> +       sysmmu-fimc3 {
> +               mmuname = "fimc3";
> +               reg = <0x11A50000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <4 5>;
> +       };
> +
> +       sysmmu-jpeg {
> +               mmuname = "jpeg";
> +               reg = <0x11A60000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <4 6>;
> +       };
> +
> +       sysmmu-g2d {
> +               mmuname = "g2d";
> +               reg = <0x10A40000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <4 7>;
> +       };
> +
> +       sysmmu-rotator {
> +               mmuname = "rotator";
> +               reg = <0x12A30000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <5 0>;
> +       };
> +
> +       sysmmu-fimd0 {
> +               mmuname = "fimd0";
> +               reg = <0x11E20000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <5 2>;
> +       };
> +
> +       sysmmu-is0 {
> +               mmuname = "isp", "drc", "fd";
> +               reg = < 0x12260000 0x1000
> +                       0x12270000 0x1000
> +                       0x122A0000 0x1000 >;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <  16 2
> +                               16 3
> +                               16 4 >;
> +       };
> +
> +       sysmmu-is1 {
> +               mmuname = "ispcpu";
> +               reg = <0x122B0000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <16 5>;
> +       };
> +
> +       sysmmu-flite0 {
> +               mmuname = "fimc-lite0";
> +               reg = <0x123B0000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <16 0>;
> +       };
> +
> +       sysmmu-flite1 {
> +               mmuname = "fimc-lite1";
> +               reg = <0x123C0000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <16 1>;
> +       };
>  };
> diff --git a/arch/arm/boot/dts/exynos5250.dtsi
b/arch/arm/boot/dts/exynos5250.dtsi
> index 2e3b6ef..2ff6d78 100644
> --- a/arch/arm/boot/dts/exynos5250.dtsi
> +++ b/arch/arm/boot/dts/exynos5250.dtsi
> @@ -75,7 +75,7 @@
>                 interrupts = <0 42 0>;
>         };
>
> -       codec at 11000000 {
> +       mfc: codec at 11000000 {
>                 compatible = "samsung,mfc-v6";
>                 reg = <0x11000000 0x10000>;
>                 interrupts = <0 96 0>;
> @@ -578,9 +578,152 @@
>                 interrupts = <0 95 0>;
>         };
>
> -       mixer {
> +       mixer: mixer {
>                 compatible = "samsung,exynos5-mixer";
>                 reg = <0x14450000 0x10000>;
>                 interrupts = <0 94 0>;
>         };
> +
> +       sysmmu-mfc-l {
> +               mmuname = "mfc_l";
> +               reg = <0x11210000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <8 5>;
> +               mmu-master = <&mfc>;
> +       };
> +
> +       sysmmu-mfc-r {
> +               mmuname = "mfc_r";
> +               reg = <0x11200000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <6 2>;
> +               mmu-master = <&mfc>;
> +       };
> +
> +       sysmmu-tv {
> +               mmuname = "tv";
> +               reg = <0x14650000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <7 4>;
> +               mmu-master = <&mixer>;
> +       };
> +
> +       sysmmu-gsc0 {
> +               mmuname = "gsc0";
> +               reg = <0x13E80000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <2 0>;
> +               mmu-master = <&gsc_0>;
> +       };
> +
> +       sysmmu-gsc1 {
> +               mmuname = "gsc1";
> +               reg = <0x13E90000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <2 2>;
> +               mmu-master = <&gsc_1>;
> +       };
> +
> +       sysmmu-gsc2 {
> +               mmuname = "gsc2";
> +               reg = <0x13EA0000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <2 4>;
> +               mmu-master = <&gsc_2>;
> +       };
> +
> +       sysmmu-gsc3 {
> +               mmuname = "gsc3";
> +               reg = <0x13EB0000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <2 6>;
> +               mmu-master = <&gsc_3>;
> +       };
> +
> +       sysmmu-fimd1 {
> +               mmuname = "fimd1";
> +               reg = <0x14640000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <3 2>;
> +       };
> +
> +       sysmmu-rotator {
> +               mmuname = "rotator";
> +               reg = <0x11D40000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <4 0>;
> +       };
> +
> +       sysmmu-is0 {
> +               mmuname = "isp", "drc", "scalerc", "scalerp", "fd", "mcu";
> +               reg = < 0x13260000 0x1000
> +                       0x13270000 0x1000
> +                       0x13280000 0x1000
> +                       0x13290000 0x1000
> +                       0x132A0000 0x1000
> +                       0x132B0000 0x1000 >;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <  10 6
> +                               11 6
> +                                5 2
> +                                3 6
> +                                5 0
> +                                5 4 >;
>
> I believe this should be
>
>                 interrupts = <10 6>, <11 6>, <5 2>,
>                              <3 6>, <5 0>, <5 4>;
>
I found the syntax of array of resources in the specifications of device
tree. I found that it works correctly.
> +       };
> +
> +       sysmmu-is1 {
> +               mmuname = "odc", "dis0", "dis1", "3dnr";
> +               reg = < 0x132C0000 0x1000
> +                       0x132D0000 0x1000
> +                       0x132E0000 0x1000
> +                       0x132F0000 0x1000 >;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <  11 0
> +                               10 4
> +                                9 4
> +                                5 6 >;
>
> Ditto.
>
> +       };
> +
> +       sysmmu-2d {
> +               mmuname = "2d";
> +               reg = <0x10A60000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <24 5>;
> +       };
> +
> +       sysmmu-jpeg {
> +               mmuname = "jpeg";
> +               reg = <0x11F20000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <4 2>;
> +       };
> +
> +       sysmmu-flite0 {
> +               mmuname = "flite0";
> +               reg = <0x13C40000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <3 4>;
> +       };
> +
> +       sysmmu-flite1 {
> +               mmuname = "flite1";
> +               reg = <0x13C50000 0x1000>;
> +               compatible = "samsung,exynos-sysmmu";
> +               interrupt-parent = <&combiner>;
> +               interrupts = <24 1>;
> +       };
>  };
>
> --
>
> Thanks,
> Sylwester
>
Thank you for kind review.

KyongHo
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