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