Request_irq fails for IRQ2

[smitha.vanga at wipro.com]

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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