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 extern void sun3_leds (unsigned char);
21
sun3_disable_interrupts(void)22 void sun3_disable_interrupts(void)
23 {
24 sun3_disable_irq(0);
25 }
26
sun3_enable_interrupts(void)27 void sun3_enable_interrupts(void)
28 {
29 sun3_enable_irq(0);
30 }
31
32 static int led_pattern[8] = {
33 ~(0x80), ~(0x01),
34 ~(0x40), ~(0x02),
35 ~(0x20), ~(0x04),
36 ~(0x10), ~(0x08)
37 };
38
39 volatile unsigned char* sun3_intreg;
40
sun3_enable_irq(unsigned int irq)41 void sun3_enable_irq(unsigned int irq)
42 {
43 *sun3_intreg |= (1 << irq);
44 }
45
sun3_disable_irq(unsigned int irq)46 void sun3_disable_irq(unsigned int irq)
47 {
48 *sun3_intreg &= ~(1 << irq);
49 }
50
sun3_int7(int irq,void * dev_id)51 static irqreturn_t sun3_int7(int irq, void *dev_id)
52 {
53 unsigned int cnt;
54
55 cnt = kstat_irqs_cpu(irq, 0);
56 if (!(cnt % 2000))
57 sun3_leds(led_pattern[cnt % 16000 / 2000]);
58 return IRQ_HANDLED;
59 }
60
sun3_int5(int irq,void * dev_id)61 static 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(1);
76 cnt = kstat_irqs_cpu(irq, 0);
77 if (!(cnt % 20))
78 sun3_leds(led_pattern[cnt % 160 / 20]);
79 local_irq_restore(flags);
80 return IRQ_HANDLED;
81 }
82
sun3_vec255(int irq,void * dev_id)83 static irqreturn_t sun3_vec255(int irq, void *dev_id)
84 {
85 return IRQ_HANDLED;
86 }
87
sun3_init_IRQ(void)88 void __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_AUTO_5, sun3_int5, 0, "clock", NULL))
95 pr_err("Couldn't register %s interrupt\n", "int5");
96 if (request_irq(IRQ_AUTO_7, sun3_int7, 0, "nmi", NULL))
97 pr_err("Couldn't register %s interrupt\n", "int7");
98 if (request_irq(IRQ_USER+127, sun3_vec255, 0, "vec255", NULL))
99 pr_err("Couldn't register %s interrupt\n", "vec255");
100 }
101