Hi Scott,
I try to request an IRQ (IRQ2 and IRQ3 which are ineterrupt no 20 and 21 in
mpc8247)in my driver . The
Call fails in setup_irq in Manage.c at /kernel/irq.
Setup _irq returns -ENOSYS
if (desc->irq_data.chip == &no_irq_chip)
return -ENOSYS;
I found that I need to pass the virtual interrupt number instead of hardware
interrupt number.
So I added below piece of code
Below is the call to request irq in my driver.
virq = irq_create_mapping(NULL, CPLD1_INTERRUPT);
if ((ret = request_irq(virq,cpld_irq_handler, 0, GPIO_CHAR_PATH, NULL))!=0)
{
printk(KERN_ERR "gpio_init: Could not grab IRQ line for CPLD ret =
%d\n",ret);
goto err1;
}
Now it fails in irq_create_mapping with NO_IRQ error.
if (controller == NULL)
host = irq_default_host;
else
host = irq_find_host(controller);
if (host == NULL) {
printk(KERN_WARNING "irq: no irq host found for %s !\n",
controller->full_name);
return NO_IRQ;
}
I just don't know what I should pass for host , also when I pass NULL for host
. I see the default host is NULL..
Could you please help me. My project delivery is near , I need help soon.
Regards,
Smitha
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