IRQ handler is not called with external IRQ

[Ran Shalit]

On Mon, Aug 17, 2015 at 8:24 AM, Ran Shalit <ranshalit at gmail.com> wrote:
> Hello,
>
>
> I have strange behaviour with external IRQ:
> The registration on external IRQ is successful, but on simulating
> interrupt the interrupt handler called.
> It seems that the interrupt was received according to SEPNR which
> shows that IRQ #2 interrupt is pending, but the handler was not
> called.
>
> These are the steps I done:
>
> 1. in DTS (using all external IRQ #2):
>
>   intc2 at 0{
>   compatible = "intc2";
>    #address-cells = <1>;
>    #size-cells = <0>;
>    reg = <0 0x1000>;
>    interrupts = <2 0x8> ;
>    interrupt-parent = <&ipic>;
>   };
>
> 2. registration in kernel for all interrupts:
>
>   np = of_find_node_by_name(NULL,"intc2");
>   if (np == NULL)
>   {
>       printk("Error node not found\n");
>   }
>      printk("Node np = 0x%0x\n",np);
>      virq = irq_of_parse_and_map(np,0);
>      printk(KERN_INFO"IRQHandler: ISR Setup VIRQ: %d \n" , virq);
>      if (0 > (error=request_irq(virq, &IRQHandler, 0, "intc2", &value))) {
>      printk(KERN_WARNING"IRQHandler: Init: Unable to allocate IRQ
> error = %d\n\n", error);
>      return -1;
>   }
>
>
> 3. interrupt handler code:
>
> int newval = 0;
> static irqreturn_t hello_IRQHandler(int irq, void *dev_id)
> {
>          unsigned int status;
>          struct timespec curr_tm;
>          printk("key_irq!!!!!\n");
>          return IRQ_HANDLED;
> }
>
> 4. in boot I get print which show success with request_irq():
>
> intc_init
> Node np = 0xdfffe288
> IRQHandler: ISR Setup VIRQ: 22
> NET: Registered protocol family 17
>
> 5. forcing interrupt in IRQ #2, or #4 result in SEPNR change, but
> there is no printing from interrupt handler
>
> 6. validation in SEPNR register that interrupt was received:
>
> # devmem2 0xe000072c
> /dev/mem opened.
> Memory mapped at address 0xb7b80000.
> Value at address 0xE000072C (0xb7b8072c): 0x20000000
>
>
> Thank you for any suggestion,
>
> Ran

The issue been resolved after changing device tree interrupt numbers
according to  Table 8-6 in reference manual.
Thank you very much for the feedbacks.


Regards,

Ran