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 int cnt;
65
66 #ifdef CONFIG_SUN3
67 intersil_clear();
68 #endif
69 #ifdef CONFIG_SUN3
70 intersil_clear();
71 #endif
72 xtime_update(1);
73 update_process_times(user_mode(get_irq_regs()));
74 cnt = kstat_irqs_cpu(irq, 0);
75 if (!(cnt % 20))
76 sun3_leds(led_pattern[cnt % 160 / 20]);
77 return IRQ_HANDLED;
78 }
79
sun3_vec255(int irq,void * dev_id)80 static irqreturn_t sun3_vec255(int irq, void *dev_id)
81 {
82 // intersil_clear();
83 return IRQ_HANDLED;
84 }
85
sun3_irq_enable(struct irq_data * data)86 static void sun3_irq_enable(struct irq_data *data)
87 {
88 sun3_enable_irq(data->irq);
89 };
90
sun3_irq_disable(struct irq_data * data)91 static void sun3_irq_disable(struct irq_data *data)
92 {
93 sun3_disable_irq(data->irq);
94 };
95
96 static struct irq_chip sun3_irq_chip = {
97 .name = "sun3",
98 .irq_startup = m68k_irq_startup,
99 .irq_shutdown = m68k_irq_shutdown,
100 .irq_enable = sun3_irq_enable,
101 .irq_disable = sun3_irq_disable,
102 .irq_mask = sun3_irq_disable,
103 .irq_unmask = sun3_irq_enable,
104 };
105
sun3_init_IRQ(void)106 void __init sun3_init_IRQ(void)
107 {
108 *sun3_intreg = 1;
109
110 m68k_setup_irq_controller(&sun3_irq_chip, handle_level_irq, IRQ_AUTO_1,
111 7);
112 m68k_setup_user_interrupt(VEC_USER, 128);
113
114 if (request_irq(IRQ_AUTO_5, sun3_int5, 0, "int5", NULL))
115 pr_err("Couldn't register %s interrupt\n", "int5");
116 if (request_irq(IRQ_AUTO_7, sun3_int7, 0, "int7", NULL))
117 pr_err("Couldn't register %s interrupt\n", "int7");
118 if (request_irq(IRQ_USER+127, sun3_vec255, 0, "vec255", NULL))
119 pr_err("Couldn't register %s interrupt\n", "vec255");
120 }
121