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Subject: Re: MPC7448_HPC2 question
From: Zang Roy-r61911 <tie-fei.zang@freescale.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Date: 26 Oct 2006 15:59:38 +0800
Cc: linuxppc-dev list <linuxppc-dev@ozlabs.org>,
	"Alexandre.Bounine@tundra.com" <Alexandre.Bounine@tundra.com>
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On Wed, 2006-10-25 at 21:45, Benjamin Herrenschmidt wrote:
> On Wed, 2006-10-25 at 17:31 +0800, Zang Roy-r61911 wrote:
> > On Wed, 2006-10-25 at 13:20, Benjamin Herrenschmidt wrote:
> > 
> > > 
> > > Cannot be replaced by:
> > > 
> > >         pci_read_irq_line(dev);
> > 
> > When I use pci_read_irq_line(), the pci interrupt number exceeds the
> > limit of mpic-> irq_count. my mpic->irq_count = 0x18, which is
> gotten
> > from on chip register. 
> > 
> > mpic_host_map() can not return successful value.
> 
> That is not normal... Something must be wrong with your code or your
> DT... can you get more details about what precisely is happening in
> both
> cases ?
> 
> Ben.
> 

I think I have gotten the point. For tsi108/9, there are 24 internal
interrupt. PCI/INTA  to PCI/INTD are routed to interrupt 23 with a
special mechanism on the chip. INTA to INTD are assiged to nubmer 36 to
39, which are exceed the nubmer irq number assigned in mpic_alloc().
This cause abnormal return in function pci_read_irq_line().
I have worked out a patch. after a test, I will publish it.
Roy