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Intc

Introduction

Introduction

This page gives an overview of intc driver which is available as part of the Xilinx Vivado and Linux distribution.

The LogiCORE™ IP AXI Interrupt Controller (INTC) core receives multiple interrupt inputs from peripheral devices and merges them

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into an interrupt output to the system processor. The registers used for storing interrupt vector addresses, checking, enabling and acknowledging interrupts are accessed through the AXI4-Lite interface.

HW/IP Features

• Support up to 32 interrupt inputs

• Capable of cascading

• Enabling and disabling of individual interrupts.

• Capable of generating software interrupts

Features supported in driver

• Single AXI INTC IP supports 32 interrupts, multiple  AXI INTC IP's can be cascaded, to support more than 32 interrupt inputs

• Supports chaining with GIC  "PL peripheral→ AXI INTC→ GIC→ ARM processor" 

• Experimental  support to load driver as module (IRQCHIP Xilinx Intc driver module support)

  • Enable that feature in the kernel configuration when using the AXI INTC in a PL overlay

Devicetree

        axi_intc_1: interrupt-controller@41200000 {
            #interrupt-cells = <2>;
            compatible = "xlnx,xps-intc-1.00.a";
            interrupt-controller ;
            reg = <0x41200000 0x10000>;
            xlnx,kind-of-intr = <0x1>;
            xlnx,num-intr-inputs = <0x3>;
        };

Mainline status

Existing driver https://github.com/Xilinx/linux-xlnx/blob/master/drivers/irqchip/irq-xilinx-intc.c is in sync with mainline .driver except following features,

• Microblaze SMP support related changes in driver

• Experimental support to load driver as module, kconfig IRQCHIP_XILINX_INTC_MODULE_SUPPORT_EXPERIMENTAL has to be enabled to use this feature

Boot log snippets

NR_IRQS:33
 
/amba_pl/interrupt-controller@41200000: num_irq=3, edge=0x1
 

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Changelog

2023.2

• None

2023.1

• None

2022.2

• None

2022.1

• v5.15 Kernel rebase

2021.2

• None

2021.1

• Added experimental support to load driver as module.

Related Links

AXI Interrupt Controller (INTC) v4.1 Product Guide
Cascade Interrupt Controller support in DTG