On Mon, Aug 17, 2015 at 8:24 AM, Ran Shalit <ransha...@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@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
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