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.
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. 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;
so that all of these functions will be set to the default APIs (default_enable,default_disable,default_startup & default_shutdown)
then i passed this struct to the set_irq_chip as follows:
set_irq_chip(4,&irqChip);
& at last i call request_irq.
My code:
Code:
irqChip.enable = NULL;
irqChip.disable = NULL;
irqChip.startup = NULL;
irqChip.shutdown = NULL;
set_irq_chip(4,&irqChip);
request_irq(4,my_handler,SA_INTERRUPT,"DSP",NULL);
but unfortunately when i tried to insert my module i got a segmentation fault. 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 & if so, should i write a code that enables my irq_number for the MPC8555 processor or what?
At last i want you to tell me if this is the right way to register my interrupt_handler for a certain interrupt_number under linux? this is my aim.
thanks in advance for your help
