On Wed, 7 Nov 2012, Vineet Gupta wrote:
> +void __init init_IRQ(void)
> +{
> + const int irq = TIMER0_IRQ;
> +
> + /*
> + * Each CPU needs to register irq of it's private TIMER0.
> + * The APIs request_percpu_irq()/enable_percpu_irq() will not be
> + * functional, if we don't "prep" the generic IRQ sub-system with
> + * the following:
> + * -Ensure that devid passed to request_percpu_irq() is indeed per cpu
> + * -disable NOAUTOEN, w/o which the device handler never gets called
What sets NOAUTOEN in the first place? The core code definitely does
not.
> + */
> + irq_set_percpu_devid(irq);
> + irq_modify_status(irq, IRQ_NOAUTOEN, 0);
Aside of that we have irq_clear_status_flags() for this.
> + plat_init_IRQ();
> +}
> +int __init get_hw_config_num_irq(void)
How is that function used ?
> +{
> + uint32_t val = read_aux_reg(ARC_REG_VECBASE_BCR);
> +
> + switch (val & 0x03) {
> + case 0:
> + return 16;
> + case 1:
> + return 32;
> + case 2:
> + return 8;
> + default:
> + return 0;
> + }
> +
> + return 0;
> +}
Thanks,
tglx
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