linux-kernel - Re: [PATCH v5 09/12] PCI: brcmstb: Refactor for chips with many regular inbound windows

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Message-ID: <e80553a4-723d-4b97-a0dc-3335b3991fc5@broadcom.com>
Date: Thu, 1 Aug 2024 09:39:43 -0700
From: Florian Fainelli <florian.fainelli@...adcom.com>
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>,
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
 Krzysztof Kozlowski <krzk@...nel.org>,
 bcm-kernel-feedback-list@...adcom.com, jim2101024@...il.com
Cc: 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 v5 09/12] PCI: brcmstb: Refactor for chips with many
 regular inbound windows

On 7/31/24 15:28, Jim Quinlan wrote:
> Provide support for new chips with multiple inbound windows while
> keeping the legacy support for the older chips.
> 
> In existing chips there are three inbound windows 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.  Typically, only
> one window was used.
> 
> Complicating the inbound window 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 take a step forward and
> drop the internal mapping while providing for multiple inbound windows.
> This works in concert with the dma-ranges property, where each provided
> range becomes an inbound window.
> 
> Signed-off-by: Jim Quinlan <james.quinlan@...adcom.com>

Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
-- 
Florian