1 /*
2 * linux/arch/m68k/sun3/sun3ints.c -- Sun-3(x) Linux interrupt handling code
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file COPYING in the main directory of this archive
6 * for more details.
7 */
8
9#include <linux/types.h>
10#include <linux/kernel.h>
11#include <linux/sched.h>
12#include <linux/kernel_stat.h>
13#include <linux/interrupt.h>
14#include <asm/intersil.h>
15#include <asm/oplib.h>
16#include <asm/sun3ints.h>
17#include <asm/irq_regs.h>
18#include <linux/seq_file.h>
19
20#include "sun3.h"
21
22void sun3_disable_interrupts(void)
23{
24 sun3_disable_irq(0);
25}
26
27void sun3_enable_interrupts(void)
28{
29 sun3_enable_irq(0);
30}
31
32static unsigned char led_pattern[8] = {
33 (u8)~(0x80), (u8)~(0x01),
34 (u8)~(0x40), (u8)~(0x02),
35 (u8)~(0x20), (u8)~(0x04),
36 (u8)~(0x10), (u8)~(0x08)
37};
38
39volatile unsigned char* sun3_intreg;
40
41void sun3_enable_irq(unsigned int irq)
42{
43 *sun3_intreg |= (1 << irq);
44}
45
46void sun3_disable_irq(unsigned int irq)
47{
48 *sun3_intreg &= ~(1 << irq);
49}
50
51static irqreturn_t sun3_int7(int irq, void *dev_id)
52{
53 unsigned int cnt;
54
55 cnt = kstat_irqs_cpu(irq, cpu: 0);
56 if (!(cnt % 2000))
57 sun3_leds(byte: led_pattern[cnt % 16000 / 2000]);
58 return IRQ_HANDLED;
59}
60
61static irqreturn_t sun3_int5(int irq, void *dev_id)
62{
63 unsigned long flags;
64 unsigned int cnt;
65
66 local_irq_save(flags);
67#ifdef CONFIG_SUN3
68 intersil_clear();
69#endif
70 sun3_disable_irq(5);
71 sun3_enable_irq(5);
72#ifdef CONFIG_SUN3
73 intersil_clear();
74#endif
75 legacy_timer_tick(ticks: 1);
76 cnt = kstat_irqs_cpu(irq, cpu: 0);
77 if (!(cnt % 20))
78 sun3_leds(byte: led_pattern[cnt % 160 / 20]);
79 local_irq_restore(flags);
80 return IRQ_HANDLED;
81}
82
83static irqreturn_t sun3_vec255(int irq, void *dev_id)
84{
85 return IRQ_HANDLED;
86}
87
88void __init sun3_init_IRQ(void)
89{
90 *sun3_intreg = 1;
91
92 m68k_setup_user_interrupt(VEC_USER, 128);
93
94 if (request_irq(irq: IRQ_AUTO_5, handler: sun3_int5, flags: 0, name: "clock", NULL))
95 pr_err("Couldn't register %s interrupt\n", "int5");
96 if (request_irq(irq: IRQ_AUTO_7, handler: sun3_int7, flags: 0, name: "nmi", NULL))
97 pr_err("Couldn't register %s interrupt\n", "int7");
98 if (request_irq(irq: IRQ_USER+127, handler: sun3_vec255, flags: 0, name: "vec255", NULL))
99 pr_err("Couldn't register %s interrupt\n", "vec255");
100}
101

source code of linux/arch/m68k/sun3/sun3ints.c