forked from Minki/linux
48 lines
1.1 KiB
Plaintext
48 lines
1.1 KiB
Plaintext
|
MIPS CPU interrupt controller
|
||
|
|
|
||
|
|
On MIPS the mips_cpu_intc_init() helper can be used to initialize the 8 CPU
|
||
|
|
IRQs from a devicetree file and create a irq_domain for IRQ controller.
|
||
|
|
|
||
|
|
With the irq_domain in place we can describe how the 8 IRQs are wired to the
|
||
|
|
platforms internal interrupt controller cascade.
|
||
|
|
|
||
|
|
Below is an example of a platform describing the cascade inside the devicetree
|
||
|
|
and the code used to load it inside arch_init_irq().
|
||
|
|
|
||
|
|
Required properties:
|
||
|
|
- compatible : Should be "mti,cpu-interrupt-controller"
|
||
|
|
|
||
|
|
Example devicetree:
|
||
|
|
cpu-irq: cpu-irq@0 {
|
||
|
|
#address-cells = <0>;
|
||
|
|
|
||
|
|
interrupt-controller;
|
||
|
|
#interrupt-cells = <1>;
|
||
|
|
|
||
|
|
compatible = "mti,cpu-interrupt-controller";
|
||
|
|
};
|
||
|
|
|
||
|
|
intc: intc@200 {
|
||
|
|
compatible = "ralink,rt2880-intc";
|
||
|
|
reg = <0x200 0x100>;
|
||
|
|
|
||
|
|
interrupt-controller;
|
||
|
|
#interrupt-cells = <1>;
|
||
|
|
|
||
|
|
interrupt-parent = <&cpu-irq>;
|
||
|
|
interrupts = <2>;
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
Example platform irq.c:
|
||
|
|
static struct of_device_id __initdata of_irq_ids[] = {
|
||
|
|
{ .compatible = "mti,cpu-interrupt-controller", .data = mips_cpu_intc_init },
|
||
|
|
{ .compatible = "ralink,rt2880-intc", .data = intc_of_init },
|
||
|
|
{},
|
||
|
|
};
|
||
|
|
|
||
|
|
void __init arch_init_irq(void)
|
||
|
|
{
|
||
|
|
of_irq_init(of_irq_ids);
|
||
|
|
}
|