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Fri, 16 Aug 2024 08:57:32 -0700 (PDT) Received: from [10.67.48.245] ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6bf6fe278ccsm18693916d6.62.2024.08.16.08.57.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 16 Aug 2024 08:57:31 -0700 (PDT) Message-ID: Date: Fri, 16 Aug 2024 08:57:27 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 10/13] PCI: brcmstb: Refactor for chips with many regular inbound windows To: Jim Quinlan , linux-pci@vger.kernel.org, Nicolas Saenz Julienne , Bjorn Helgaas , Lorenzo Pieralisi , Cyril Brulebois , Stanimir Varbanov , Manivannan Sadhasivam , Krzysztof Kozlowski , bcm-kernel-feedback-list@broadcom.com, jim2101024@gmail.com Cc: Lorenzo Pieralisi , =?UTF-8?Q?Krzysztof_Wilczy=C5=84ski?= , Rob Herring , "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" , "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" , open list References: <20240815225731.40276-1-james.quinlan@broadcom.com> <20240815225731.40276-11-james.quinlan@broadcom.com> Content-Language: en-US From: Florian Fainelli Autocrypt: addr=florian.fainelli@broadcom.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 8/15/24 15:57, 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 Reviewed-by: Florian Fainelli -- Florian