[PATCH 2/2] [POWERPC] Add L2 cache node to AMCC Taishan dts file

[PATCH 2/2] [POWERPC] Add L2 cache node to AMCC Taishan dts file

[Stefan Roese]

This patch adds the L2 cache node to the Taishan 440GX dts file.

Signed-off-by: Stefan Roese <sr@denx.de>
---
 arch/powerpc/boot/dts/taishan.dts     |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/boot/dts/taishan.dts b/arch/powerpc/boot/dts/taishan.dts
index 8278068..d0bff33 100644
--- a/arch/powerpc/boot/dts/taishan.dts
+++ b/arch/powerpc/boot/dts/taishan.dts
@@ -104,6 +104,16 @@
 		// FIXME: anything else?
 	};
 
+	L2C0: l2c@30 {
+		compatible = "ibm,l2-cache-440gx", "ibm,l2-cache";
+		dcr-reg = <20 8			/* Internal SRAM DCR's */
+			   30 8>;		/* L2 cache DCR's */
+		cache-line-size = <20>;		/* 32 bytes */
+		cache-size = <40000>;		/* L2, 256K */
+		interrupt-parent = <&UIC2>;
+		interrupts = <17 1>;
+	};
+
 	plb {
 		compatible = "ibm,plb-440gx", "ibm,plb4";
 		#address-cells = <2>;
-- 
1.5.4.4

Re: [PATCH 2/2] [POWERPC] Add L2 cache node to AMCC Taishan dts file

[Segher Boessenkool]

> +	L2C0: l2c@30 {
> +		compatible = "ibm,l2-cache-440gx", "ibm,l2-cache";
> +		dcr-reg = <20 8			/* Internal SRAM DCR's */
> +			   30 8>;		/* L2 cache DCR's */

The unit address is based on the _first_ entry in "reg".  No2 this
is "dcr-reg", but you don't really want to be more incompatible than
necessary...


Segher

Re: [PATCH 2/2] [POWERPC] Add L2 cache node to AMCC Taishan dts file

[David Gibson]

On Tue, Mar 18, 2008 at 02:37:46PM +0100, Stefan Roese wrote:
> This patch adds the L2 cache node to the Taishan 440GX dts file.
> 
> Signed-off-by: Stefan Roese <sr@denx.de>
> ---
>  arch/powerpc/boot/dts/taishan.dts     |   10 ++++++++++
>  1 files changed, 10 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/powerpc/boot/dts/taishan.dts b/arch/powerpc/boot/dts/taishan.dts
> index 8278068..d0bff33 100644
> --- a/arch/powerpc/boot/dts/taishan.dts
> +++ b/arch/powerpc/boot/dts/taishan.dts
> @@ -104,6 +104,16 @@
>  		// FIXME: anything else?
>  	};
>  
> +	L2C0: l2c@30 {

A node with no reg property shouldn't have a unit address.

> +		compatible = "ibm,l2-cache-440gx", "ibm,l2-cache";
> +		dcr-reg = <20 8			/* Internal SRAM DCR's */
> +			   30 8>;		/* L2 cache DCR's */
> +		cache-line-size = <20>;		/* 32 bytes */
> +		cache-size = <40000>;		/* L2, 256K */
> +		interrupt-parent = <&UIC2>;
> +		interrupts = <17 1>;
> +	};

Now.. usually cache nodes are given as descendents of the CPU node.
In this case you have the DCR control registers though, so I guess
this is representing a control interface rather than the cache
itself.  Hrm.. not really sure how to do this.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

Re: [PATCH 2/2] [POWERPC] Add L2 cache node to AMCC Taishan dts file

[Stefan Roese]

On Wednesday 19 March 2008, David Gibson wrote:
> On Tue, Mar 18, 2008 at 02:37:46PM +0100, Stefan Roese wrote:
> > This patch adds the L2 cache node to the Taishan 440GX dts file.
> >
> > Signed-off-by: Stefan Roese <sr@denx.de>
> > ---
> >  arch/powerpc/boot/dts/taishan.dts     |   10 ++++++++++
> >  1 files changed, 10 insertions(+), 0 deletions(-)
> >
> > diff --git a/arch/powerpc/boot/dts/taishan.dts
> > b/arch/powerpc/boot/dts/taishan.dts index 8278068..d0bff33 100644
> > --- a/arch/powerpc/boot/dts/taishan.dts
> > +++ b/arch/powerpc/boot/dts/taishan.dts
> > @@ -104,6 +104,16 @@
> >  		// FIXME: anything else?
> >  	};
> >
> > +	L2C0: l2c@30 {
>
> A node with no reg property shouldn't have a unit address.

OK, I'll remove the unit address.

> > +		compatible = "ibm,l2-cache-440gx", "ibm,l2-cache";
> > +		dcr-reg = <20 8			/* Internal SRAM DCR's */
> > +			   30 8>;		/* L2 cache DCR's */
> > +		cache-line-size = <20>;		/* 32 bytes */
> > +		cache-size = <40000>;		/* L2, 256K */
> > +		interrupt-parent = <&UIC2>;
> > +		interrupts = <17 1>;
> > +	};
>
> Now.. usually cache nodes are given as descendents of the CPU node.
> In this case you have the DCR control registers though, so I guess
> this is representing a control interface rather than the cache
> itself.  Hrm.. not really sure how to do this.

So should I change the location then?

Best regards,
Stefan

Re: [PATCH 2/2] [POWERPC] Add L2 cache node to AMCC Taishan dts file

[Stefan Roese]

On Tuesday 18 March 2008, Segher Boessenkool wrote:
> > +	L2C0: l2c@30 {
> > +		compatible = "ibm,l2-cache-440gx", "ibm,l2-cache";
> > +		dcr-reg = <20 8			/* Internal SRAM DCR's */
> > +			   30 8>;		/* L2 cache DCR's */
>
> The unit address is based on the _first_ entry in "reg".

I'll remove the unit address.

> No2 this 
> is "dcr-reg", but you don't really want to be more incompatible than
> necessary...

Sorry, I'm not sure what you're trying to tell me here.

Best regards,
Stefan