linux-kernel - Re: [PATCH v2 07/12] riscv: dts: starfive: jh7100: Add ccache DT node

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Message-ID: <4e71c2ff-6189-4a2d-8ec0-fb9fe4a9971f@collabora.com>
Date:   Tue, 31 Oct 2023 21:01:14 +0200
From:   Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To:     Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        Samin Guo <samin.guo@...rfivetech.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Richard Cochran <richardcochran@...il.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH v2 07/12] riscv: dts: starfive: jh7100: Add ccache DT node

On 10/31/23 16:38, Emil Renner Berthing wrote:
> Cristian Ciocaltea wrote:
>> Provide a DT node for the SiFive Composable Cache controller found on
>> the StarFive JH7100 SoC.
>>
>> Note this is also used to support non-coherent DMA, via the
>> sifive,cache-ops cache flushing operations.
> 
> This property is no longer needed:
> https://lore.kernel.org/linux-riscv/20231031141444.53426-1-emil.renner.berthing@canonical.com/

Thanks for the heads up! I actually noticed that from v1 reviews and was
just waiting for v2. :)

> Also it would be nice to mention that these nodes are copied from my
> visionfive patches ;)

Ups, sorry about that! Those were initially taken from a patch adding a
full DT (the repo is mentioned in the cover letter) with many
contributors mentioned, without being clear who did what. That's why I
didn't provide a Co-developed-by tag and, unfortunately, I also missed
to add it in v2 (will handle this in v3 and also provide the link to the
new repo), but I'm still not sure about the gmac stuff.

Thanks,
Cristian

>>
>> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
>> ---
>>  arch/riscv/boot/dts/starfive/jh7100.dtsi | 14 ++++++++++++++
>>  1 file changed, 14 insertions(+)
>>
>> diff --git a/arch/riscv/boot/dts/starfive/jh7100.dtsi b/arch/riscv/boot/dts/starfive/jh7100.dtsi
>> index 06bb157ce111..a8a5bb00b0d8 100644
>> --- a/arch/riscv/boot/dts/starfive/jh7100.dtsi
>> +++ b/arch/riscv/boot/dts/starfive/jh7100.dtsi
>> @@ -32,6 +32,7 @@ U74_0: cpu@0 {
>>  			i-tlb-sets = <1>;
>>  			i-tlb-size = <32>;
>>  			mmu-type = "riscv,sv39";
>> +			next-level-cache = <&ccache>;
>>  			riscv,isa = "rv64imafdc";
>>  			riscv,isa-base = "rv64i";
>>  			riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr",
>> @@ -60,6 +61,7 @@ U74_1: cpu@1 {
>>  			i-tlb-sets = <1>;
>>  			i-tlb-size = <32>;
>>  			mmu-type = "riscv,sv39";
>> +			next-level-cache = <&ccache>;
>>  			riscv,isa = "rv64imafdc";
>>  			riscv,isa-base = "rv64i";
>>  			riscv,isa-extensions = "i", "m", "a", "f", "d", "c", "zicntr", "zicsr",
>> @@ -147,6 +149,18 @@ soc {
>>  		dma-noncoherent;
>>  		ranges;
>>
>> +		ccache: cache-controller@...0000 {
>> +			compatible = "starfive,jh7100-ccache", "sifive,ccache0", "cache";
>> +			reg = <0x0 0x2010000 0x0 0x1000>;
>> +			interrupts = <128>, <130>, <131>, <129>;
>> +			cache-block-size = <64>;
>> +			cache-level = <2>;
>> +			cache-sets = <2048>;
>> +			cache-size = <2097152>;
>> +			cache-unified;
>> +			sifive,cache-ops;
>> +		};
>> +
>>  		clint: clint@...0000 {
>>  			compatible = "starfive,jh7100-clint", "sifive,clint0";
>>  			reg = <0x0 0x2000000 0x0 0x10000>;
>> --
>> 2.42.0
>>