linux-kernel - Re: [PATCH v3 09/12] PCI: brcmstb: Refactor for chips with many regular inbound BARs

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Message-ID: <326f51f7-bcb0-4214-ae0e-7dd1d96f5e97@suse.de>
Date: Mon, 15 Jul 2024 13:38:56 +0300
From: Stanimir Varbanov <svarbanov@...e.de>
To: Jim Quinlan <james.quinlan@...adcom.com>, linux-pci@...r.kernel.org,
 Nicolas Saenz Julienne <nsaenz@...nel.org>,
 Bjorn Helgaas <bhelgaas@...gle.com>,
 Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
 Cyril Brulebois <kibi@...ian.org>, Stanimir Varbanov <svarbanov@...e.de>,
 Krzysztof Kozlowski <krzk@...nel.org>,
 bcm-kernel-feedback-list@...adcom.com, jim2101024@...il.com
Cc: Florian Fainelli <florian.fainelli@...adcom.com>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Krzysztof Wilczyński <kw@...ux.com>,
 Rob Herring <robh@...nel.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>,
 open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 09/12] PCI: brcmstb: Refactor for chips with many
 regular inbound BARs



On 7/11/24 01:16, Jim Quinlan wrote:
> Previously, our chips provided three inbound "BARS" with fixed purposes:
> the first was for mapping SoC internal registers, the second was for
> memory, and the third was for memory but with the endian swapped.  We
> typically only used one of these BARs.
> 
> Complicating that BARs usage was the fact that the PCIe HW would do a
> baroque internal mapping of system memory, and concatenate the regions of
> multiple memory controllers.
> 
> Newer chips such as the 7712 and Cable Modem SOCs have taken a step forward
> and now provide multiple inbound BARs.  This works in concert with the
> dma-ranges property, where each provided range becomes an inbound BAR.
> 
> This commit provides support for these new chips and their multiple
> inbound BARs but also keeps the legacy support for the older system.
> 
> Signed-off-by: Jim Quinlan <james.quinlan@...adcom.com>
> ---
>  drivers/pci/controller/pcie-brcmstb.c | 216 ++++++++++++++++++++------
>  1 file changed, 167 insertions(+), 49 deletions(-)
> 

Reviewed-by: Stanimir Varbanov <svarbanov@...e.de>

~Stan