PCI IRQ -MPC8540

[Jin Zhengxiong-R64188]

>What kinda of interrupt do you want on IRQ_OUT/INTA?

>- k

On Jan 16, 2007, at 7:54 PM, agnel juni wrote:

> Yes IRQ_OUT is wired to INTA.
>
> Could you please advise on how to generate interrupt for this.

You can refer to a Freescale Linux BSP for MPC8540EVAL board. There's a pci agent driver for MPC8540, and the corresponding host driver for MPC8560. The agent driver use a message interrupt in MPC8540 and redirect the interrupt to IRQ_OUT. As the IRQ_OUT is wired to INTA, you can treat MPC8540 as a PCI device.

Jason Jin


> Thanks
> J-
>
> ----- Original Message ----
> From: Kumar Gala <galak at kernel.crashing.org>
> To: agnel juni <junijoseph at yahoo.co.in>
> Cc: linuxppc-embedded at ozlabs.org
> Sent: Tuesday, 16 January, 2007 5:29:01 PM
> Subject: Re: PCI IRQ -MPC8540
>
>
> On Jan 16, 2007, at 5:20 PM, agnel juni wrote:
>
> > Hello all:
> >
> > I would like to understand if there is a way to program the PCI 
> > interrupt pin register of MPC8540. I did look for this in the 
> > datasheet, but couldn't find any positive answer.
> >
> > Currently, I am working in a set-up where MPC8540 is an agent, 
> > plugged into the PC host. I couldn't get an IRQ for the card when 
> > plugged in some PCI slots, whereas in one of the slots I do see a 
> > non-zero value.
> >
> > It would be great if you could help me understand the issue.
> >
> > I am sorry if the question is inapporpriate in the group. I am 
> > desperate to solve the issue.
> >
> > Thanks for any help.
>
> You need to find out how the PCI edge interrupts are wired on you 
> board than we can talk about how to generate an interrupt based on 
> that.  I'd guess IRQ_OUT is wired to INTA, but it would be good to 
> verify that.
>
> - k
>
> > J.Joseph
> >
> > ----- Original Message ----
> > From: Kumar Gala <galak at kernel.crashing.org>
> > To: Wang Matthew-R59995 <Qi.W at freescale.com>
> > Cc: linuxppc-embedded at ozlabs.org
> > Sent: Wednesday, 18 October, 2006 6:54:24 PM
> > Subject: Re: Linuxppc-embedded Digest, Vol 26, Issue 36
> >
> >
> > On Oct 18, 2006, at 8:10 PM, Wang Matthew-R59995 wrote:
> >
> > > Hi Kumar,
> > >
> > > Actually I do many trials about it. Vxwerks Bootrom is smaller
> than
> > > U-Boot. The key difference between Bootrom and U-boot is that some 
> > > source code of Bootrom is invisible to the users.
> > >
> > > Actually the rfi instruction which I point out is the first rfi 
> > > instruction of Linux PowerPC bringup.
> > >
> > > Before that, it's TLB entry invalidation and temp TLB entry
> mapping.
> > >
> > > I check MMU setting carefully before coming Linux Kernel.
> > >
> > > I just want to know if other guys met similar scenario like me. I 
> > > don't need the precise answer, just overall suggestion about it
> because I
> > > understand that not everyone has the same bootloader of mine, that 
> > > bootloader is actually a customized bootloader.
> >
> > I understand that, thus I was asking what exact problem you were 
> > seeing to try and help.
> >
> > > Anyway thank you.
> > >
> > > R9 point to LR register, mask the high 20 bit of r9 and send to
> r7,
> > > and
> > > then add 24, which means stride 6 instructions for rfi instruction 
> > > execution.
> > >
> > > Of course, rfi can switch the TLB entry, both the previous TLB 
> > > entry and the temp TLB entry point to the same physical address.
> > >
> > > I've checked it.
> >
> > I know what the code does, I wrote it :)
> >
> > - kumar
> >
> >
> >
> > _______________________________________________
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> > Linuxppc-embedded at ozlabs.org 
> > https://ozlabs.org/mailman/listinfo/linuxppc-embedded
> >
> >
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>
>
>
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