[PATCH v3] arm: add acpi support for the arm

[Steven Hao]

Dear Simon：

I am expecting it.

Regards,
Steven Hao

获取 Outlook for iOS<https://aka.ms/o0ukef>
________________________________
发件人: Simon Glass <sjg at chromium.org>
发送时间: Saturday, December 28, 2019 12:41:59 AM
收件人: Steven Hao <steven_hao5189 at outlook.com>
抄送: Bin Meng <bmeng.cn at gmail.com>; Heinrich Schuchardt <xypron.glpk at gmx.de>; liuhao at phytium.com.cn <liuhao at phytium.com.cn>; agraf at csgraf.de <agraf at csgraf.de>; jagan at amarulasolutions.com <jagan at amarulasolutions.com>; marek.vasut at gmail.com <marek.vasut at gmail.com>; sr at denx.de <sr at denx.de>; patrice.chotard at st.com <patrice.chotard at st.com>; afd at ti.com <afd at ti.com>; horatiu.vultur at microchip.com <horatiu.vultur at microchip.com>; narmstrong at baylibre.com <narmstrong at baylibre.com>; ryder.lee at mediatek.com <ryder.lee at mediatek.com>; igor.opaniuk at gmail.com <igor.opaniuk at gmail.com>; patrick.delaunay at st.com <patrick.delaunay at st.com>; eugen.hristev at microchip.com <eugen.hristev at microchip.com>; judge.packham at gmail.com <judge.packham at gmail.com>; yamada.masahiro at socionext.com <yamada.masahiro at socionext.com>; swarren at nvidia.com <swarren at nvidia.com>; michal.simek at xilinx.com <michal.simek at xilinx.com>; u-boot at lists.denx.de <u-boot at lists.denx.de>; Andy Shevchenko <andriy.shevchenko at linux.intel.com>
主题: Re: [PATCH v3] arm: add acpi support for the arm

Hi,

On Sun, 15 Dec 2019 at 18:54, Steven Hao <steven_hao5189 at outlook.com> wrote:
>
> This problem seems like lay aside.
>
> ________________________________
> 发件人: Bin Meng <bmeng.cn at gmail.com>
> 发送时间: 2019年11月27日 14:04
> 收件人: Simon Glass <sjg at chromium.org>
> 抄送: Heinrich Schuchardt <xypron.glpk at gmx.de>; Steven Hao <steven_hao5189 at outlook.com>; liuhao at phytium.com.cn <liuhao at phytium.com.cn>; agraf at csgraf.de <agraf at csgraf.de>; jagan at amarulasolutions.com <jagan at amarulasolutions.com>; marek.vasut at gmail.com <marek.vasut at gmail.com>; sr at denx.de <sr at denx.de>; patrice.chotard at st.com <patrice.chotard at st.com>; afd at ti.com <afd at ti.com>; horatiu.vultur at microchip.com <horatiu.vultur at microchip.com>; narmstrong at baylibre.com <narmstrong at baylibre.com>; ryder.lee at mediatek.com <ryder.lee at mediatek.com>; igor.opaniuk at gmail.com <igor.opaniuk at gmail.com>; patrick.delaunay at st.com <patrick.delaunay at st.com>; eugen.hristev at microchip.com <eugen.hristev at microchip.com>; judge.packham at gmail.com <judge.packham at gmail.com>; yamada.masahiro at socionext.com <yamada.masahiro at socionext.com>; swarren at nvidia.com <swarren at nvidia.com>; michal.simek at xilinx.com <michal.simek at xilinx.com>; u-boot at lists.denx.de <u-boot at lists.denx.de>; Andy Shevchenko <andriy.shevchenko at linux.intel.com>
> 主题: Re: [PATCH v3] arm: add acpi support for the arm
>
> Hi Simon,
>
> On Wed, Nov 27, 2019 at 11:42 AM Simon Glass <sjg at chromium.org> wrote:
> >
> > Hi Heinrich,
> >
> > On Mon, 25 Nov 2019 at 18:12, Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
> > >
> > > On 11/26/19 12:40 AM, Simon Glass wrote:
> > > > Hi,
> > > >
> > > > On Mon, 25 Nov 2019 at 15:57, Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
> > > >>
> > > >> On 11/25/19 3:42 AM, Steven Hao wrote:> 获取 Outlook for iOS
> > > >> <https://aka.ms/o0ukef>
> > > >>> ------------------------------------------------------------------------
> > > >>> *主题:* Re: [PATCH v3] arm: add acpi support for the arm
> > > >>> Hi Steven,
> > > >>>
> > > >>> On Mon, Nov 25, 2019 at 10:09 AM Steven Hao <steven_hao5189 at outlook.com>
> > > >>> wrote:
> > > >>>>
> > > >>>> Dear Bin：
> > > >>>>
> > > >>>> Firstly：
> > > >>>> I know that acpi about x86 is existing. And it is usefull for x86
> > > >> platfporm. If it  is used to arm platform，some modification may have to
> > > >> do. For example，facs table is useless for arm.
> > > >>>>
> > > >>>> In adition，The acpi table is writed statically and then modified
> > > >> dynamically in my patch. It is a new method.
> > > >>>>
> > > >>>> I want to consult that whether my method is helpful or not.
> > > >>>>
> > > >>>> Secondly：
> > > >>>> If i want to reuse the x86-acpi. I will overwrite the
> > > >> write_acpi_tables function. But the definition about acpi strcuture is
> > > >> placed in arch/x86/include/asm directory. It can not be used to arm
> > > >> plateform. If the acpi library need to surport for all platform，i  think
> > > >> it should move to /include directory.
> > > >>>>
> > > >>>
> > > >>> Yes, we all are aware that modifications are needed to the existing
> > > >>> x86 ACPI support to support ARM. We don't want to create 2 ACP
> > > >>> implementation in U-Boot.
> > > >>>
> > > >>> Regards,
> > > >>> Bin> Dear Bin：
> > > >>>
> > > >>> I have a suggetion that the acpi specification definition such as all
> > > >>> acpi table structure definition  should be place in /include directory.
> > > >>> and write_acpi_tables function can be placed in platform directory.
> > > >>>    Creating acpi table mothod  can be diffrent between x86 and arm.
> > > >>>
> > > >>> Thank you
> > > >>> Steven Hao
> > > >>>
> > > >>
> > > >> Currently we are using CPU specific C files generating ACPI tables, e.g.
> > > >> arch/x86/cpu/tangier/acpi.c.
> > > >>
> > > >> I would prefer if we would generate the ACPI tables and definition
> > > >> blocks completely from text files instead of using C code. This would
> > > >> avoid any architecture specific code.
> > > >
> > > > I am finding with Apollo Lake that this isn't possible - we need to
> > > > insert run-time information into the tables set up with .asl files.
> > >
> > > For device trees we generate the binary form with a compiler. Then we
> > > patch the device tree with runtime information in image_setup_libfdt().
> > >
> > > Couldn't we go a similar way for ACPI?
> >
> > Yes that's my goal, except that some tables are generated wholesale
> > from code (equivalent to entire nodes in DT).
> >
> > I had a bit of a look at how this is done in coreboot. It is pretty
> > hard to follow as there are weak functions and the code jumps back and
> > forth between generic code and SoC-specific code. But every device has
> > ACPI operation and I think that makes sense.
> >
> > My current idea is to add a new optional acpi_ops struct pointer into
> > each struct driver, to handle the ACPI table generation and other
> > things needed by ACPI. Then devices that want to do ACPI things can do
> > so. Then we need a new drivers/core/acpi.c file to handle things.
> >
>
> Yes, this approach makes sense to me, for dynamic ACPI table generation.

Just an update on this...I have some basic code for APL and am making
progress. I expect to send patches by the end of January.

Regards,
Simon