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Commit 9689c99e authored by Zubair Lutfullah Kakakhel's avatar Zubair Lutfullah Kakakhel Committed by Marc Zyngier
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irqchip/xilinx: Add support for parent intc 



The MIPS based xilfpga platform has the following IRQ structure

Peripherals --> xilinx_intcontroller -> mips_cpu_int controller

Add support for the driver to chain the irq handler

Signed-off-by: default avatarZubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent 2120a435

drivers/irqchip/irq-xilinx-intc.c

+32 −2
Original line number Diff line number Diff line
@@ -12,10 +12,12 @@ 
#include <linux/irqdomain.h>

#include <linux/irq.h>

#include <linux/irqchip.h>

#include <linux/irqchip/chained_irq.h>

#include <linux/of_address.h>

#include <linux/io.h>

#include <linux/jump_label.h>

#include <linux/bug.h>

#include <linux/of_irq.h>



/* No one else should require these constants, so define them locally here. */

#define ISR 0x00			/* Interrupt Status Register */
@@ -133,11 +135,26 @@ static const struct irq_domain_ops xintc_irq_domain_ops = { 
	.map = xintc_map,

};



static void xil_intc_irq_handler(struct irq_desc *desc)

{

	struct irq_chip *chip = irq_desc_get_chip(desc);

	u32 pending;



	chained_irq_enter(chip, desc);

	do {

		pending = xintc_get_irq();

		if (pending == -1U)

			break;

		generic_handle_irq(pending);

	} while (true);

	chained_irq_exit(chip, desc);

}



static int __init xilinx_intc_of_init(struct device_node *intc,

					     struct device_node *parent)

{

	u32 nr_irq;

	int ret;

	int ret, irq;

	struct xintc_irq_chip *irqc;



	if (xintc_irqc) {
@@ -196,7 +213,20 @@ static int __init xilinx_intc_of_init(struct device_node *intc, 
		goto err_alloc;

	}



	if (parent) {

		irq = irq_of_parse_and_map(intc, 0);

		if (irq) {

			irq_set_chained_handler_and_data(irq,

							 xil_intc_irq_handler,

							 irqc);

		} else {

			pr_err("irq-xilinx: interrupts property not in DT\n");

			ret = -EINVAL;

			goto err_alloc;

		}

	} else {

		irq_set_default_host(irqc->root_domain);

	}



	return 0;