linux-kernel - Re: [PATCH v3 27/33] iommu/mediatek: Initialise bank HW for each a bank

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Date:   Tue, 4 Jan 2022 16:54:20 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Tomasz Figa <tfiga@...omium.org>,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org,
        Hsin-Yi Wang <hsinyi@...omium.org>, youlin.pei@...iatek.com,
        anan.sun@...iatek.com, chao.hao@...iatek.com,
        yen-chang.chen@...iatek.com
Subject: Re: [PATCH v3 27/33] iommu/mediatek: Initialise bank HW for each a
 bank

Il 23/09/21 13:58, Yong Wu ha scritto:
> The mt8195 IOMMU HW max support 5 banks, and regarding the banks'
> registers, it looks like:
> 
>   ----------------------------------------
>   |bank0  | bank1 | bank2 | bank3 | bank4|
>   ----------------------------------------
>   |global |
>   |control|         null
>   |regs   |
>   -----------------------------------------
>   |bank   |bank   |bank   |bank   |bank   |
>   |regs   |regs   |regs   |regs   |regs   |
>   |       |       |       |       |       |
>   -----------------------------------------
> 
> Each bank has some special bank registers and it share bank0's global
> control registers. this patch initialise the bank hw with the bankid.
> 
> In the hw_init, we always initialise bank0's control register since
> we don't know if the bank0 is initialised.
> 
> Additionally, About each bank's register base, always delta 0x1000.
> like bank[x + 1] = bank[x] + 0x1000.
> 
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>


Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>