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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* MPC85xx 8259 functions for DS Board Setup
*
* Author Xianghua Xiao (x.xiao@freescale.com)
* Roy Zang <tie-fei.zang@freescale.com>
* - Add PCI/PCI Express support
* Copyright 2007 Freescale Semiconductor Inc.
*/
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <asm/mpic.h>
#include <asm/i8259.h>
#include "mpc85xx.h"
static void mpc85xx_8259_cascade(struct irq_desc *desc)
{
struct irq_chip *chip = irq_desc_get_chip(desc);
unsigned int cascade_irq = i8259_irq();
if (cascade_irq)
generic_handle_irq(cascade_irq);
chip->irq_eoi(&desc->irq_data);
}
void __init mpc85xx_8259_init(void)
{
struct device_node *np;
struct device_node *cascade_node = NULL;
int cascade_irq;
/* Initialize the i8259 controller */
for_each_node_by_type(np, "interrupt-controller") {
if (of_device_is_compatible(np, "chrp,iic")) {
cascade_node = np;
break;
}
}
if (cascade_node == NULL) {
pr_debug("i8259: Could not find i8259 PIC\n");
return;
}
cascade_irq = irq_of_parse_and_map(cascade_node, 0);
if (!cascade_irq) {
pr_err("i8259: Failed to map cascade interrupt\n");
return;
}
pr_debug("i8259: cascade mapped to irq %d\n", cascade_irq);
i8259_init(cascade_node, 0);
of_node_put(cascade_node);
irq_set_chained_handler(cascade_irq, mpc85xx_8259_cascade);
}
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