mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
55 lines
2.2 KiB
55 lines
2.2 KiB
Some socs have a large number of interrupts requests to service |
|
the needs of its many peripherals and subsystems. All of the |
|
interrupt lines from the subsystems are not needed at the same |
|
time, so they have to be muxed to the irq-controller appropriately. |
|
In such places a interrupt controllers are preceded by an CROSSBAR |
|
that provides flexibility in muxing the device requests to the controller |
|
inputs. |
|
|
|
Required properties: |
|
- compatible : Should be "ti,irq-crossbar" |
|
- reg: Base address and the size of the crossbar registers. |
|
- interrupt-controller: indicates that this block is an interrupt controller. |
|
- ti,max-irqs: Total number of irqs available at the parent interrupt controller. |
|
- ti,max-crossbar-sources: Maximum number of crossbar sources that can be routed. |
|
- ti,reg-size: Size of a individual register in bytes. Every individual |
|
register is assumed to be of same size. Valid sizes are 1, 2, 4. |
|
- ti,irqs-reserved: List of the reserved irq lines that are not muxed using |
|
crossbar. These interrupt lines are reserved in the soc, |
|
so crossbar bar driver should not consider them as free |
|
lines. |
|
|
|
Optional properties: |
|
- ti,irqs-skip: This is similar to "ti,irqs-reserved", but these are for |
|
SOC-specific hard-wiring of those irqs which unexpectedly bypasses the |
|
crossbar. These irqs have a crossbar register, but still cannot be used. |
|
|
|
- ti,irqs-safe-map: integer which maps to a safe configuration to use |
|
when the interrupt controller irq is unused (when not provided, default is 0) |
|
|
|
Examples: |
|
crossbar_mpu: crossbar@4a002a48 { |
|
compatible = "ti,irq-crossbar"; |
|
reg = <0x4a002a48 0x130>; |
|
ti,max-irqs = <160>; |
|
ti,max-crossbar-sources = <400>; |
|
ti,reg-size = <2>; |
|
ti,irqs-reserved = <0 1 2 3 5 6 131 132>; |
|
ti,irqs-skip = <10 133 139 140>; |
|
}; |
|
|
|
Consumer: |
|
======== |
|
See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt and |
|
Documentation/devicetree/bindings/interrupt-controller/arm,gic.yaml for |
|
further details. |
|
|
|
An interrupt consumer on an SoC using crossbar will use: |
|
interrupts = <GIC_SPI request_number interrupt_level> |
|
|
|
Example: |
|
device_x@4a023000 { |
|
/* Crossbar 8 used */ |
|
interrupts = <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>; |
|
... |
|
};
|
|
|