On Mon, 30 Sep 2013, Sricharan R wrote:
> +/*
> + * @int_max: maximum number of supported interrupts
> + * @irq_map: array of interrupts to crossbar number mapping
> + * @crossbar_base: crossbar base address
> + * @register_offsets: offsets for each irq number
> + */
> +struct crossbar_device {
> + uint int_max;
> + uint *irq_map;
Why do you need another map here?
Isn't the linear_revmap of the irqdomain sufficient?
> +static inline const u32 allocate_free_irq(int cb_no)
> +{
> + int i;
> +
> + for (i = 0; i < cb->int_max; i++) {
> + if (cb->irq_map[i] == IRQ_FREE) {
> + cb->irq_map[i] = cb_no;
> + return i;
> + }
> + }
> +
> + return -ENODEV;
> +}
> +
> +static int crossbar_domain_xlate(struct irq_domain *d,
> + struct device_node *controller,
> + const u32 *intspec, unsigned int intsize,
> + unsigned long *out_hwirq,
> + unsigned int *out_type)
> +{
> + return allocate_free_irq(intspec[1]) + GIC_IRQ_START;
Mooo. In the error case you return:
-ENODEV + GIC_IRQ_START == -19 + 32 == 13
Yikes.
> +
> + /*
> + * Register offsets are not linear because of the
> + * reserved irqs. so find and store the offsets once.
> + */
> + for (i = 0; i < max; i++) {
> + if (!cb->irq_map[i])
> + continue;
> +
> + cb->register_offsets[i] = reserved;
> + reserved += size;
I'm amazed by such a brilliant hardware design.
Thanks,
tglx
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