RE: [PATCH v7] arm64: dts: qcom: sc7180: Add WCN3990 WLAN module device node

[<pillair@codeaurora.org>]

Hi All,

I have posted v8 for this patch after correcting the wlan_fw_mem start
address.

Thanks,
Rakesh Pillai.

> -----Original Message-----
> From: pillair@codeaurora.org <pillair@codeaurora.org>
> Sent: Sunday, March 29, 2020 4:37 PM
> To: 'Bjorn Andersson' <bjorn.andersson@linaro.org>
> Cc: 'devicetree@vger.kernel.org' <devicetree@vger.kernel.org>; 'linux-arm-
> kernel@lists.infradead.org' <linux-arm-kernel@lists.infradead.org>;
'linux-
> kernel@vger.kernel.org' <linux-kernel@vger.kernel.org>; 'linux-arm-
> msm@vger.kernel.org' <linux-arm-msm@vger.kernel.org>
> Subject: RE: [PATCH v7] arm64: dts: qcom: sc7180: Add WCN3990 WLAN
> module device node
> 
> Hi Bjorn,
> 
> > -----Original Message-----
> > From: Bjorn Andersson <bjorn.andersson@linaro.org>
> > Sent: Sunday, March 29, 2020 12:01 AM
> > To: pillair@codeaurora.org
> > Cc: devicetree@vger.kernel.org; linux-arm-kernel@lists.infradead.org;
> linux-
> > kernel@vger.kernel.org; linux-arm-msm@vger.kernel.org
> > Subject: Re: [PATCH v7] arm64: dts: qcom: sc7180: Add WCN3990 WLAN
> > module device node
> >
> > On Sat 28 Mar 05:01 PDT 2020, pillair@codeaurora.org wrote:
> >
> > > Hi Bjorn,
> > >  Comments inline.
> > >
> > >
> > > > -----Original Message-----
> > > > From: Bjorn Andersson <bjorn.andersson@linaro.org>
> > > > Sent: Saturday, March 28, 2020 4:30 AM
> > > > To: Rakesh Pillai <pillair@codeaurora.org>
> > > > Cc: devicetree@vger.kernel.org;
linux-arm-kernel@lists.infradead.org;
> > > linux-
> > > > kernel@vger.kernel.org; linux-arm-msm@vger.kernel.org
> > > > Subject: Re: [PATCH v7] arm64: dts: qcom: sc7180: Add WCN3990 WLAN
> > > > module device node
> > > >
> > > > On Thu 26 Mar 03:48 PDT 2020, Rakesh Pillai wrote:
> > > >
> > > > > Add device node for the ath10k SNOC platform driver probe
> > > > > and add resources required for WCN3990 on sc7180 soc.
> > > > >
> > > > > Signed-off-by: Rakesh Pillai <pillair@codeaurora.org>
> > > > > ---
> > > > >
> > > > > Depends on https://patchwork.kernel.org/patch/11455345/
> > > > > The above patch adds the dt-bindings for wifi-firmware
> > > > > subnode
> > > > > ---
> > > > >  arch/arm64/boot/dts/qcom/sc7180-idp.dts |  8 ++++++++
> > > > >  arch/arm64/boot/dts/qcom/sc7180.dtsi    | 27
> > > > +++++++++++++++++++++++++++
> > > > >  2 files changed, 35 insertions(+)
> > > > >
> > > > > diff --git a/arch/arm64/boot/dts/qcom/sc7180-idp.dts
> > > > b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
> > > > > index 043c9b9..a6168a4 100644
> > > > > --- a/arch/arm64/boot/dts/qcom/sc7180-idp.dts
> > > > > +++ b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
> > > > > @@ -327,6 +327,14 @@
> > > > >  	};
> > > > >  };
> > > > >
> > > > > +&wifi {
> > > > > +	status = "okay";
> > > > > +	qcom,msa-fixed-perm;
> > > > > +	wifi-firmware {
> > > > > +		iommus = <&apps_smmu 0xc2 0x1>;
> > > >
> > > > How is sc7180 different from sdm845, where the iommus property goes
> > > > directly in the &wifi node?
> > >
> > > Sc7180 IDP is a target without TrustZone support and also with S2
IOMMU
> > > enabled.
> > > Since in Trustzone based targets, the iommu SID configuration was done
> by
> > > TZ, there was nothing required to be done by driver.
> > > But in non-TZ based targets, the IOMMU mappings need to be done by
> the
> > > driver.
> > > Since this is the mapping of the firmware memory and to keep it
different
> > > from the driver memory access, a different device has been created for
> > > firmware and these SIDs are configured.
> > >
> >
> > I see, I missed the fact that 0xc0:1 is used in the &wifi node itself.
> >
> > So to confirm, we have streams 0xc0 and 0xc1 for data pipes and 0xc2 and
> > 0xc3 for some form of firmware access? And in the normal Qualcomm
> design
> > implementation the 0c2/0xc3 stream mapping is setup by TZ, and hidden
> > from Linux using the SMMU virtualisation?
> >
> >
> > Would have been nice to have some better mechanism for describing
> > multi-connected hardware block, than to sprinkle dummy nodes all over
> > the DT...
> 
> Yes, this is the firmware memory. This method is followed in the venus
video
> driver
> https://patchwork.kernel.org/patch/11315765/
> 
> Do you suggest following some other mechanism ?
> 
> Thanks,
> Rakesh Pillai.
> 
> >
> > Regards,
> > Bjorn
> >
> > > The below ath10k series brings-in this support.
> > > https://patchwork.kernel.org/project/linux-
> > wireless/list/?series=261367&stat
> > > e=*
> > >
> > > Thanks,
> > > Rakesh Pillai.
> > >
> > > >
> > > > Regards,
> > > > Bjorn
> > > >
> > > > > +	};
> > > > > +};
> > > > > +
> > > > >  /* PINCTRL - additions to nodes defined in sc7180.dtsi */
> > > > >
> > > > >  &qspi_clk {
> > > > > diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi
> > > > b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> > > > > index 998f101..2745128 100644
> > > > > --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
> > > > > +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> > > > > @@ -83,6 +83,11 @@
> > > > >  			reg = <0 0x8f600000 0 0x500000>;
> > > > >  			no-map;
> > > > >  		};
> > > > > +
> > > > > +		wlan_fw_mem: memory@94104000 {
> > > > > +			reg = <0 0x94104000 0 0x200000>;
> > > > > +			no-map;
> > > > > +		};
> > > > >  	};
> > > > >
> > > > >  	cpus {
> > > > > @@ -835,6 +840,28 @@
> > > > >  			};
> > > > >  		};
> > > > >
> > > > > +		wifi: wifi@18800000 {
> > > > > +			compatible = "qcom,wcn3990-wifi";
> > > > > +			reg = <0 0x18800000 0 0x800000>;
> > > > > +			reg-names = "membase";
> > > > > +			iommus = <&apps_smmu 0xc0 0x1>;
> > > > > +			interrupts =
> > > > > +				<GIC_SPI 414 IRQ_TYPE_LEVEL_HIGH
> /* CE0
> > > > */ >,
> > > > > +				<GIC_SPI 415 IRQ_TYPE_LEVEL_HIGH
> /* CE1
> > > > */ >,
> > > > > +				<GIC_SPI 416 IRQ_TYPE_LEVEL_HIGH
> /* CE2
> > > > */ >,
> > > > > +				<GIC_SPI 417 IRQ_TYPE_LEVEL_HIGH
> /* CE3
> > > > */ >,
> > > > > +				<GIC_SPI 418 IRQ_TYPE_LEVEL_HIGH
> /* CE4
> > > > */ >,
> > > > > +				<GIC_SPI 419 IRQ_TYPE_LEVEL_HIGH
> /* CE5
> > > > */ >,
> > > > > +				<GIC_SPI 420 IRQ_TYPE_LEVEL_HIGH
> /* CE6
> > > > */ >,
> > > > > +				<GIC_SPI 421 IRQ_TYPE_LEVEL_HIGH
> /* CE7
> > > > */ >,
> > > > > +				<GIC_SPI 422 IRQ_TYPE_LEVEL_HIGH
> /* CE8
> > > > */ >,
> > > > > +				<GIC_SPI 423 IRQ_TYPE_LEVEL_HIGH
> /* CE9
> > > > */ >,
> > > > > +				<GIC_SPI 424 IRQ_TYPE_LEVEL_HIGH
> /* CE10
> > > > */>,
> > > > > +				<GIC_SPI 425 IRQ_TYPE_LEVEL_HIGH
> /* CE11
> > > > */>;
> > > > > +			memory-region = <&wlan_fw_mem>;
> > > > > +			status = "disabled";
> > > > > +		};
> > > > > +
> > > > >  		config_noc: interconnect@1500000 {
> > > > >  			compatible = "qcom,sc7180-config-noc";
> > > > >  			reg = <0 0x01500000 0 0x28000>;
> > > > > --
> > > > > 2.7.4