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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/segment.h>
15 #include <asm/intersil.h>
16 #include <asm/oplib.h>
17 #include <asm/sun3ints.h>
18 #include <asm/irq_regs.h>
19 #include <linux/seq_file.h>
20 
21 extern void sun3_leds (unsigned char);
22 
sun3_disable_interrupts(void)23 void sun3_disable_interrupts(void)
24 {
25 	sun3_disable_irq(0);
26 }
27 
sun3_enable_interrupts(void)28 void sun3_enable_interrupts(void)
29 {
30 	sun3_enable_irq(0);
31 }
32 
33 static int led_pattern[8] = {
34        ~(0x80), ~(0x01),
35        ~(0x40), ~(0x02),
36        ~(0x20), ~(0x04),
37        ~(0x10), ~(0x08)
38 };
39 
40 volatile unsigned char* sun3_intreg;
41 
sun3_enable_irq(unsigned int irq)42 void sun3_enable_irq(unsigned int irq)
43 {
44 	*sun3_intreg |=  (1 << irq);
45 }
46 
sun3_disable_irq(unsigned int irq)47 void sun3_disable_irq(unsigned int irq)
48 {
49 	*sun3_intreg &= ~(1 << irq);
50 }
51 
sun3_int7(int irq,void * dev_id)52 static irqreturn_t sun3_int7(int irq, void *dev_id)
53 {
54 	unsigned int cnt;
55 
56 	cnt = kstat_irqs_cpu(irq, 0);
57 	if (!(cnt % 2000))
58 		sun3_leds(led_pattern[cnt % 16000 / 2000]);
59 	return IRQ_HANDLED;
60 }
61 
sun3_int5(int irq,void * dev_id)62 static irqreturn_t sun3_int5(int irq, void *dev_id)
63 {
64 	unsigned long flags;
65 	unsigned int cnt;
66 
67 	local_irq_save(flags);
68 #ifdef CONFIG_SUN3
69 	intersil_clear();
70 #endif
71 	sun3_disable_irq(5);
72 	sun3_enable_irq(5);
73 #ifdef CONFIG_SUN3
74 	intersil_clear();
75 #endif
76 	xtime_update(1);
77 	update_process_times(user_mode(get_irq_regs()));
78 	cnt = kstat_irqs_cpu(irq, 0);
79 	if (!(cnt % 20))
80 		sun3_leds(led_pattern[cnt % 160 / 20]);
81 	local_irq_restore(flags);
82 	return IRQ_HANDLED;
83 }
84 
sun3_vec255(int irq,void * dev_id)85 static irqreturn_t sun3_vec255(int irq, void *dev_id)
86 {
87 	return IRQ_HANDLED;
88 }
89 
sun3_init_IRQ(void)90 void __init sun3_init_IRQ(void)
91 {
92 	*sun3_intreg = 1;
93 
94 	m68k_setup_user_interrupt(VEC_USER, 128);
95 
96 	if (request_irq(IRQ_AUTO_5, sun3_int5, 0, "clock", NULL))
97 		pr_err("Couldn't register %s interrupt\n", "int5");
98 	if (request_irq(IRQ_AUTO_7, sun3_int7, 0, "nmi", NULL))
99 		pr_err("Couldn't register %s interrupt\n", "int7");
100 	if (request_irq(IRQ_USER+127, sun3_vec255, 0, "vec255", NULL))
101 		pr_err("Couldn't register %s interrupt\n", "vec255");
102 }
103