On Thu, Mar 12, 2009 at 5:24 AM, EXTERNAL Lange Matthias (AA-DGW/ENG1)
<matthias.la...@beissbarth.com> wrote:
> Hi,
>
> I am working on a MPC5200-based board. There is a dual port RAM connected to
> the MPC5200 via the localbus. In my setup one can raise an interrupt at the
> MPC5200 to signal new that new data has arrived in the dual port RAM. I have
> already found out that the interrupt delivery actually works (do_IRQ gets
> called when raising the interrupt).
>
> My problem is that my driver (kernel 2.6.24) can not register for the
> interrupt. Each time I call request_irq I get -ENOSYS. I am suspecting that I
> have done something wrong in my dts defining the dual port RAM. I have
> defined the device as follows
>
> localbus {
> compatible = "fsl,orion-localbus",
> "fsl,mpc5200-localbus",
> "fsl,pq2-localbus";
This should be: compatible = "fsl,mpc5200b-lpb","fsl,mpc5200-lpb","simple-bus";
It doesn't make much sense to claim compatibility with fsl,orion or
fsl,pq2 because the mpc5200 localbus is neither of those.
> #address-cells = <2>;
> #size-cells = <1>;
> reg = <f0010100 40>;
> ranges = <0 0 fe000000 00400000>;
>
> dp...@40000000 {
> device_type = "dpram";
Don't use device_type. It doesn't make any sense in the flattened
device tree. Use a compatible value instead, and prefix dpram with
the vendor and board name of the platform. ie: compatible =
"<company>,<board>-dpram". You should also document what this
compatible value means in Documentation/powerpc/device-tree/
> interrupts = <0 0 0>;
What hardware irq# are you using? See this link for a description of
what the interrupts property should look like for external IRQs:
http://patchwork.ozlabs.org/patch/11349/
To use this property, the irq_of_parse_and_map() function will
translate from the device tree to a Linux IRQ number.
> interrupt-parent = <&mpc5200_pic>;
You probably also want a reg = <0 0 0x00400000>; property for mapping
the address range.
> };
> };
>
> What am I doing wrong? What am I missing?
>
> Thanks,
> Matthias Lange.
> _______________________________________________
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> Linuxppc-dev@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-dev
>
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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