Re: Regarding MPC8540 IRQ Issue

["Bhupender Saharan" <bhupi.saharan@gmail.com>]

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Hi Sudhir,

You got a try all the interrupt vecrots corressponding to INTA, INTB, INTC
and INTD, Not the free interrupts.

Bhupi


On 6/18/07, sudheer <urwithsudheer@gmail.com> wrote:
>
>  Hi Bhupi
> Thanks for the response.
> I tried with all the free irqs as per  /proc/interrupts  in request_irq
> function one in each trial.  But in none of them it jumped to interrupt
> handler.
> Please let me know whether this is the one you said to try or anything
> else. ?
>
> Thanks
> Sudheer
>
> Bhupender Saharan wrote:
>
> Hi Sudhir,
>
> >From the PCI dump it looks like IRQ PIN register is 0. During enumeration
> when BIOS sees that IRQ PIN register is 0, it would not allocate any
> interrupt for this card and that's why you are seeing IRQ Line register also
> as 0 value.
>
> We need to do some work around for this.
>
>  IN the driver you need to register for all the pci vectors( INTA,B,C and
> D). You would be called for any interrupt happening on the bus. you have to
> check if the interrupt is for you and then claim it otherwise return that
> interrupt is not for you.
>
>
> Regards
> Bhupi
>
>
> On 6/16/07, sudheer <urwithsudheer@gmail.com> wrote:
> >
> > Hello All
> >
> > I am working on MPC8540 board placing it in the PCI slot of the x86
> > system.
> > After system bootup , i could see the powerpc board detected and pci
> > config space configured.
> > But i could not find any IRQ assigned for it.
> >
> > SetUp:
> > Host: x86 System- Linux-2.6.9
> > HOST PCI Slot is 64-bit, 66MHz
> > Agent: MPC8540 Board.
> >
> > Here is dump of "lspci -vx " for this device.
> >
> > 04:03.0 Power PC: Motorola MPC8540 (rev 20) (prog-if 01)
> >         Flags: bus master, 66Mhz, fast devsel, latency 64
> >         Memory at dee00000 (32-bit, non-prefetchable) [size=1M]
> >         Capabilities: [60] #00 [0000]
> > 00: 57 10 08 00 46 01 b0 00 20 01 20 0b 00 40 00 00
> > 10: 00 00 e0 de 00 00 00 00 00 00 00 00 00 00 00 00
> > 20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> > 30: 00 00 00 00 60 00 00 00 00 00 00 00 00 00 00 00
> >
> > >From the above dump - IRQ Pin & Line of config space shows zeroes.
> >
> > I tried writing a small module and probing for IRQ generating a message
> > interrupt. Though i could see in the 8540 message status register that
> > interrupt is generated, i could not get any IRQ when i do the probe. For
> >
> > this trial,  i have configured the PIC message enable register, message
> > vector/priority and destination registers, processor current task
> > priority register (CPTR).
> >
> > Can anyone give me some suggestions to try out.
> >
> > Thanks
> > Sudheer
> >
> > _______________________________________________
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> > Linuxppc-embedded@ozlabs.org
> > https://ozlabs.org/mailman/listinfo/linuxppc-embedded
> >
>
>
>

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