On 9/14/07, Matt Sealey <[EMAIL PROTECTED]> wrote:
> Grant Likely wrote:
> > On 9/14/07, Matt Sealey <[EMAIL PROTECTED]> wrote:
> >> sparse, irq_of_find_and_map isn't much help). Maybe I am just not
> >> looking in the right place but not being an MPC52xx PIC Expert I
> >> wouldn't even know where to start...
> >
> > The l2 irq numbers map directly to the interrupt numbers listed in the
> > 5200b user guide. For example, on p7-11, the masks are listed for
> > main interrupts 0 through 16. and on p7-17,18, the peripherial
> > interrupts are listed as numbered from 0 to 23 (but notice that it
> > does *not* line up with bit positions).
>
> Wow I even had to search.. it's on p7-13 here..
>
> Right but it does start from a certain bit and progress linearly
> across the rest of the register.
>
> However, what is interrupt 0 and what is interrupt 16? Do you start
> from the left or the right (i.e. Motorola big endian or Rest Of
> World big endian)??
>
> > However, it is interesting to note that other than in the register
> > definitions, I don't think there is anywhere in the 5200b user manual
> > that simple lists the interrupt numbers for each interrupt type.
>
> I think the interesting note is that picking out "what does IRQ 4
> in the main interrupt group handle" or picking out a device and
> saying "this is IRQ 10" is still, even with your explanation, a
> matter of luck and handedness.
>
> Personally I would count from the right (Motorola bit 31) and
> work my way from LSB to MSB, but Motorola likes it's backwards
> representation and so do some other people. So, does bit 31
> equal interrupt 0 or interrupt 16? :)
No, they are explicitly numbered. Are you looking at the 5200 or the
5200B user manual? In my copy, on page 7-17, I see this: PSa0 in
peripheral interrupt 0 (l2=0), PSa23 is peripheral interrupt #23
(l2=23)
Bits Name
8 PSa23 BestCom
9 PSa22 BDLC
10 PSa0 BestCom
11 PSa1 PSC1
12 PSa2 PSC2
13 PSa3 PSC3
14 PSa4 PSC6
15 PSa5 Ethernet
16 PSa6 USB
17 PSa7 ATA
18 PSa8 PCI Contr
19 PSa9 PCI SC In
20 PSa10 PCI SC In
21 PSa11 PSC4
22 PSa12 PSC5
23 PSa13 SPI modf
24 PSa14 SPI spif
25 PSa15 I2C1
26 PSa16 I2C2
27 PSa17 CAN1
28 PSa18 CAN2
29:30 — Reserved
31 PSa21 XLB Arbit
>
> Then there are the status encoded registers, which report which
> IRQ is firing. They are just values. But which value corresponds
> to which interrupt (left or right reading) here or do they even
> have completely different ones?
>
> --
> Matt Sealey <[EMAIL PROTECTED]>
> Genesi, Manager, Developer Relations
>
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
[EMAIL PROTECTED]
(403) 399-0195
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