linux-kernel - [PATCH v8] Add MediaTek MT6779 devapc driver

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Date:   Thu, 15 Oct 2020 11:24:36 +0800
From:   Neal Liu <neal.liu@...iatek.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     Neal Liu <neal.liu@...iatek.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>,
        wsd_upstream <wsd_upstream@...iatek.com>
Subject: [PATCH v8] Add MediaTek MT6779 devapc driver

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On Thu, 2020-10-15 at 11:20 +0800, Neal Liu wrote:
> These patch series introduce a MediaTek MT6779 devapc driver.
> 
> MediaTek bus fabric provides TrustZone security support and data protection to prevent slaves from being accessed by unexpected masters.
> The security violation is logged and sent to the processor for further analysis or countermeasures.
> 
> Any occurrence of security violation would raise an interrupt, and it will be handled by mtk-devapc driver.
> The violation information is printed in order to find the murderer.
> 
> changes since v7:
> - fix VIO_MOD_TO_REG_IND calculation wrong problem.
> - revise parameter type of ISR.
> 
> changes since v6:
> - remove unnecessary mask/unmask module irq during ISR.
> 
> changes since v5:
> - remove redundant write reg operation.
> - use static variable of vio_dbgs instead.
> - add stop_devapc() if driver is removed.
> 
> changes since v4:
> - refactor data structure.
> - merge two simple functions into one.
> - refactor register setting to prevent too many function call overhead.
> 
> changes since v3:
> - revise violation handling flow to make it more easily to understand
>   hardware behavior.
> - add more comments to understand how hardware works.
> 
> changes since v2:
> - pass platform info through DT data.
> - remove unnecessary function.
> - remove slave_type because it always equals to 1 in current support SoC.
> - use vio_idx_num instread of list all devices' index.
> - add more comments to describe hardware behavior.
> 
> changes since v1:
> - move SoC specific part to DT data.
> - remove unnecessary boundary check.
> - remove unnecessary data type declaration.
> - use read_poll_timeout() instread of for loop polling.
> - revise coding style elegantly.
> 
> 
> *** BLURB HERE ***
> 
> Neal Liu (2):
>   dt-bindings: devapc: add bindings for mtk-devapc
>   soc: mediatek: add mt6779 devapc driver
> 
>  .../bindings/soc/mediatek/devapc.yaml         |  58 ++++
>  drivers/soc/mediatek/Kconfig                  |   9 +
>  drivers/soc/mediatek/Makefile                 |   1 +
>  drivers/soc/mediatek/mtk-devapc.c             | 308 ++++++++++++++++++
>  4 files changed, 376 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/mediatek/devapc.yaml
>  create mode 100644 drivers/soc/mediatek/mtk-devapc.c
>