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