On Jan 16, 2008, at 12:03 AM, vb wrote:
> Greetings,
>
> I am trying to write a BSP for an 8245 based device. One thing which
> really gets me puzzled is the 'ISU' facility in
> arch/powerpc/sysdev/mpic.c, there is also a notion of ISU-less
> platforms, etc. I looked through the chip's programmer's reference,
> even read the original AMD/Cypress OpenPIC specification - not a clue.
>
> What is it, at the very least - what does ISU stand for?
>
> I would really appreciate any hints,
Interrupt service unit. I believe its an IBM concept.
For 8245 can you look at what the linkstation port is doing and mimic
that. I believe its an 8245 or 8241 so it should be close to what you
need.
mpic = mpic_alloc(dnp, paddr, MPIC_PRIMARY |
MPIC_WANTS_RESET, 4, 32, " EPIC ");
BUG_ON(mpic == NULL);
/* PCI IRQs */
mpic_assign_isu(mpic, 0, paddr + 0x10200);
/* I2C */
mpic_assign_isu(mpic, 1, paddr + 0x11000);
/* ttyS0, ttyS1 */
mpic_assign_isu(mpic, 2, paddr + 0x11100);
mpic_init(mpic);
- k
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