dn_ints.c

 1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/interrupt.h>
 3#include <linux/irq.h>
 4
 5#include <asm/traps.h>
 6#include <asm/apollohw.h>
 7
 8#include "apollo.h"
 9
10static unsigned int apollo_irq_startup(struct irq_data *data)
11{
12	unsigned int irq = data->irq;
13
14	if (irq < 8)
15		*(volatile unsigned char *)(pica+1) &= ~(1 << irq);
16	else
17		*(volatile unsigned char *)(picb+1) &= ~(1 << (irq - 8));
18	return 0;
19}
20
21static void apollo_irq_shutdown(struct irq_data *data)
22{
23	unsigned int irq = data->irq;
24
25	if (irq < 8)
26		*(volatile unsigned char *)(pica+1) |= (1 << irq);
27	else
28		*(volatile unsigned char *)(picb+1) |= (1 << (irq - 8));
29}
30
31static void apollo_irq_eoi(struct irq_data *data)
32{
33	*(volatile unsigned char *)(pica) = 0x20;
34	*(volatile unsigned char *)(picb) = 0x20;
35}
36
37static struct irq_chip apollo_irq_chip = {
38	.name           = "apollo",
39	.irq_startup    = apollo_irq_startup,
40	.irq_shutdown   = apollo_irq_shutdown,
41	.irq_eoi	= apollo_irq_eoi,
42};
43
44
45void __init dn_init_IRQ(void)
46{
47	m68k_setup_user_interrupt(VEC_USER + 96, 16);
48	m68k_setup_irq_controller(&apollo_irq_chip, handle_fasteoi_irq,
49				  IRQ_APOLLO, 16);
50}