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
10 static 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
21 static 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
31 static void apollo_irq_eoi(struct irq_data *data)
32 {
33 *(volatile unsigned char *)(pica) = 0x20;
34 *(volatile unsigned char *)(picb) = 0x20;
35 }
36
37 static 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
45 void __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 }
51
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