linux-kernel - Re: [PATCH v1 4/4] PCI: brcmstb: Augment driver for MIPs SOCs

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Date:   Thu, 9 Dec 2021 13:32:43 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Jim Quinlan <jim2101024@...il.com>, linux-pci@...r.kernel.org,
        linux-mips@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Kevin Cernekee <cernekee@...il.com>,
        bcm-kernel-feedback-list@...adcom.com, james.quinlan@...adcom.com
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1 4/4] PCI: brcmstb: Augment driver for MIPs SOCs

On 12/9/21 12:47 PM, Jim Quinlan wrote:
> The current brcmstb driver works for Arm and Arm64.  A few things are
> modified here for us to support MIPs as well.
> 
>   o There are four outbound range register groups and each directs a window
>     of up to 128MB.  Even though there are four 128MB DT "ranges" in the
>     bmips PCIe DT node, these ranges are contiguous and are collapsed into
>     a single range by the OF range parser.  Now the driver assumes a single
>     range -- for MIPs only -- and splits it back into 128MB sizes.
> 
>   o For bcm7425, the config space accesses must be 32-bit reads or
>     writes.  In addition, the 4k config space register array is missing
>     and not used.
> 
>   o The registers for the upper 32-bits of the outbound window address do
>     not exist.
> 
>   o Burst size must be set to 256 (this refers to an internal bus).
> 
> Signed-off-by: Jim Quinlan <jim2101024@...il.com>

Acked-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian