wael showair wrote:
Dear all,
First here is the setup i've:
1. The board is SPTWIMAX-CC1E board
2. The processor is MPC8555 i found it in the powerpc family NOT ppc family.
Also the board contains DSP core.
3. Linux Kernel 2.6.19-rc5 running on the MPC8555 processor side.
That's rather old...
I aim to let the DSP processor interrupts the MPC8555 processor so i think
the first step is to register an interrupt handler for an interrupt number.
i found this in the linux API request_irq. so
i make a simple module & write in it
request_irq(4,my_handler,SA_INTERRUPT,"DSP",NULL); but unfortunately it
returns -ENOSYS.
If we had a FAQ, this would be entry #1. request_irq() takes virtual
IRQ numbers, not hardware numbers of some specific PIC. You need to
create a mapping, typically via the device tree. Google should be able
to provide more details.
i have tracked the error & i found this is because the
irq_chip structure was not set.
so i added the API of set_irq_chip as follows:
irqChip.enable = NULL;
irqChip.disable = NULL;
irqChip.startup = NULL;
irqChip.shutdown = NULL;
That's kind of like commenting out every line with an error until the
code builds. :-P
but unfortunately when i tried to insert my module i got a segmentation
fault.
That tends to happen if you tell the kernel to call a NULL pointer.
i have tracked it & i found this is because of the unmask function of
my interrupt irq_chip was not set.
so do i have to implement it
No, it's already implemented in the MPIC driver.
-Scott
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