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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2008 Freescale Semiconductor, Inc.
*/
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <asm/mpic.h>
#include <asm/i8259.h>
#include "mpc86xx.h"
#ifdef CONFIG_PPC_I8259
static void mpc86xx_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);
}
#endif /* CONFIG_PPC_I8259 */
void __init mpc86xx_init_irq(void)
{
#ifdef CONFIG_PPC_I8259
struct device_node *np;
struct device_node *cascade_node = NULL;
int cascade_irq;
#endif
struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
MPIC_SINGLE_DEST_CPU,
0, 256, " MPIC ");
BUG_ON(mpic == NULL);
mpic_init(mpic);
#ifdef CONFIG_PPC_I8259
/* Initialize 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) {
printk(KERN_DEBUG "Could not find i8259 PIC\n");
return;
}
cascade_irq = irq_of_parse_and_map(cascade_node, 0);
if (!cascade_irq) {
printk(KERN_ERR "Failed to map cascade interrupt\n");
return;
}
i8259_init(cascade_node, 0);
of_node_put(cascade_node);
irq_set_chained_handler(cascade_irq, mpc86xx_8259_cascade);
#endif
}
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