mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-27 13:05:03 +08:00
5b250889b3
Signed-off-by: Lennert Buytenhek <buytenh@secretlab.ca> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
/*
|
|
* Copyright 2008 Freescale Semiconductor, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*/
|
|
|
|
#include <linux/stddef.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/of_platform.h>
|
|
|
|
#include <asm/system.h>
|
|
#include <asm/mpic.h>
|
|
#include <asm/i8259.h>
|
|
|
|
#ifdef CONFIG_PPC_I8259
|
|
static void mpc86xx_8259_cascade(unsigned int irq, struct irq_desc *desc)
|
|
{
|
|
struct irq_chip *chip = get_irq_desc_chip(desc);
|
|
unsigned int cascade_irq = i8259_irq();
|
|
|
|
if (cascade_irq != NO_IRQ)
|
|
generic_handle_irq(cascade_irq);
|
|
|
|
chip->irq_eoi(&desc->irq_data);
|
|
}
|
|
#endif /* CONFIG_PPC_I8259 */
|
|
|
|
void __init mpc86xx_init_irq(void)
|
|
{
|
|
struct mpic *mpic;
|
|
struct device_node *np;
|
|
struct resource res;
|
|
#ifdef CONFIG_PPC_I8259
|
|
struct device_node *cascade_node = NULL;
|
|
int cascade_irq;
|
|
#endif
|
|
|
|
/* Determine PIC address. */
|
|
np = of_find_node_by_type(NULL, "open-pic");
|
|
if (np == NULL)
|
|
return;
|
|
of_address_to_resource(np, 0, &res);
|
|
|
|
mpic = mpic_alloc(np, res.start,
|
|
MPIC_PRIMARY | MPIC_WANTS_RESET |
|
|
MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS |
|
|
MPIC_SINGLE_DEST_CPU,
|
|
0, 256, " MPIC ");
|
|
of_node_put(np);
|
|
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 == NO_IRQ) {
|
|
printk(KERN_ERR "Failed to map cascade interrupt\n");
|
|
return;
|
|
}
|
|
|
|
i8259_init(cascade_node, 0);
|
|
of_node_put(cascade_node);
|
|
|
|
set_irq_chained_handler(cascade_irq, mpc86xx_8259_cascade);
|
|
#endif
|
|
}
|