aboutsummaryrefslogtreecommitdiffstats
path: root/arch/ppc/amiga/ints.c
blob: 5d318e498f06f7ece7fba335be1db7cde9952da1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
/*
 *  arch/ppc/amiga/ints.c
 *
 *  Linux/m68k general interrupt handling code from arch/m68k/kernel/ints.c
 *  Needed to drive the m68k emulating IRQ hardware on the PowerUp boards.
 */

#include <linux/types.h>
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/seq_file.h>

#include <asm/setup.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/page.h>
#include <asm/machdep.h>

/* table for system interrupt handlers */
static irq_handler_t irq_list[SYS_IRQS];

static const char *default_names[SYS_IRQS] = {
	"spurious int", "int1 handler", "int2 handler", "int3 handler",
	"int4 handler", "int5 handler", "int6 handler", "int7 handler"
};

/* The number of spurious interrupts */
volatile unsigned int num_spurious;

#define NUM_IRQ_NODES 100
static irq_node_t nodes[NUM_IRQ_NODES];


/*
 * void init_IRQ(void)
 *
 * Parameters:	None
 *
 * Returns:	Nothing
 *
 * This function should be called during kernel startup to initialize
 * the IRQ handling routines.
 */

__init
void m68k_init_IRQ(void)
{
	int i;

	for (i = 0; i < SYS_IRQS; i++) {
		if (mach_default_handler)
			irq_list[i].handler = (*mach_default_handler)[i];
		irq_list[i].flags   = 0;
		irq_list[i].dev_id  = NULL;
		irq_list[i].devname = default_names[i];
	}

	for (i = 0; i < NUM_IRQ_NODES; i++)
		nodes[i].handler = NULL;

	mach_init_IRQ ();
}

irq_node_t *new_irq_node(void)
{
	irq_node_t *node;
	short i;

	for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--)
		if (!node->handler)
			return node;

	printk ("new_irq_node: out of nodes\n");
	return NULL;
}

int sys_request_irq(unsigned int irq,
                    void (*handler)(int, void *, struct pt_regs *),
                    unsigned long flags, const char *devname, void *dev_id)
{
	if (irq < IRQ1 || irq > IRQ7) {
		printk("%s: Incorrect IRQ %d from %s\n",
		       __FUNCTION__, irq, devname);
		return -ENXIO;
	}

#if 0
	if (!(irq_list[irq].flags & IRQ_FLG_STD)) {
		if (irq_list[irq].flags & IRQ_FLG_LOCK) {
			printk("%s: IRQ %d from %s is not replaceable\n",
			       __FUNCTION__, irq, irq_list[irq].devname);
			return -EBUSY;
		}
		if (!(flags & IRQ_FLG_REPLACE)) {
			printk("%s: %s can't replace IRQ %d from %s\n",
			       __FUNCTION__, devname, irq, irq_list[irq].devname);
			return -EBUSY;
		}
	}
#endif

	irq_list[irq].handler = handler;
	irq_list[irq].flags   = flags;
	irq_list[irq].dev_id  = dev_id;
	irq_list[irq].devname = devname;
	return 0;
}

void sys_free_irq(unsigned int irq, void *dev_id)
{
	if (irq < IRQ1 || irq > IRQ7) {
		printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
		return;
	}

	if (irq_list[irq].dev_id != dev_id)
		printk("%s: Removing probably wrong IRQ %d from %s\n",
		       __FUNCTION__, irq, irq_list[irq].devname);

	irq_list[irq].handler = (*mach_default_handler)[irq];
	irq_list[irq].flags   = 0;
	irq_list[irq].dev_id  = NULL;
	irq_list[irq].devname = default_names[irq];
}

asmlinkage void process_int(unsigned long vec, struct pt_regs *fp)
{
	if (vec >= VEC_INT1 && vec <= VEC_INT7 && !MACH_IS_BVME6000) {
		vec -= VEC_SPUR;
		kstat_cpu(0).irqs[vec]++;
		irq_list[vec].handler(vec, irq_list[vec].dev_id, fp);
	} else {
		if (mach_process_int)
			mach_process_int(vec, fp);
		else
			panic("Can't process interrupt vector %ld\n", vec);
		return;
	}
}

int m68k_get_irq_list(struct seq_file *p, void *v)
{
	int i;

	/* autovector interrupts */
	if (mach_default_handler) {
		for (i = 0; i < SYS_IRQS; i++) {
			seq_printf(p, "auto %2d: %10u ", i,
			               i ? kstat_cpu(0).irqs[i] : num_spurious);
			seq_puts(p, "  ");
			seq_printf(p, "%s\n", irq_list[i].devname);
		}
	}

	mach_get_irq_list(p, v);
	return 0;
}