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
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
|
/*
* Code to handle irqs on Orion boards
* -- Cort <cort@fsmlabs.com>
*/
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel_stat.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/timex.h>
#include <linux/malloc.h>
#include <linux/random.h>
#include <asm/bitops.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mipsregs.h>
#include <asm/system.h>
#include <asm/orion.h>
void (*board_time_init)(struct irqaction *irq);
extern asmlinkage void orionIRQ(void);
irq_cpustat_t irq_stat [NR_CPUS];
unsigned int local_bh_count[NR_CPUS];
unsigned int local_irq_count[NR_CPUS];
unsigned long spurious_count = 0;
irq_desc_t irq_desc[NR_IRQS];
irq_desc_t *irq_desc_base=&irq_desc[0];
static void galileo_ack(unsigned int irq_nr)
{
*((unsigned long *) (((unsigned)(0x14000000)|0xA0000000) + 0xC18)) =
cpu_to_le32(0);
}
struct hw_interrupt_type galileo_pic = {
" Galileo ",
NULL,
NULL,
NULL, /* unmask_irq */
NULL, /* mask_irq */
galileo_ack, /* mask_and_ack */
0
};
/* Function for careful CP0 interrupt mask access */
static inline void modify_cp0_intmask(unsigned clr_mask, unsigned set_mask)
{
unsigned long status = read_32bit_cp0_register(CP0_STATUS);
status &= ~((clr_mask & 0xFF) << 8);
status |= (set_mask & 0xFF) << 8;
write_32bit_cp0_register(CP0_STATUS, status);
}
static inline void mask_irq(unsigned int irq_nr)
{
modify_cp0_intmask(irq_nr, 0);
}
static inline void unmask_irq(unsigned int irq_nr)
{
modify_cp0_intmask(0, irq_nr);
}
void disable_irq(unsigned int irq_nr)
{
unsigned long flags;
save_and_cli(flags);
mask_irq(irq_nr);
restore_flags(flags);
}
void enable_irq(unsigned int irq_nr)
{
unsigned long flags;
save_and_cli(flags);
unmask_irq(irq_nr);
restore_flags(flags);
}
/*static struct irqaction *irq_action[NR_IRQS] = {
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
};
*/
void __init orion_time_init(struct irqaction *irq)
{
irq_desc[2].handler = &galileo_pic;
irq_desc[2].action = irq;
/* This code was provided by the CoSine guys and despite its
* appearance init's the timer.
* -- Cort
*/
*((__u32 *) (((unsigned)(0x14000000)|0xA0000000) + 0x864)) =
cpu_to_le32(0);
*((__u32 *) (((unsigned)(0x14000000)|0xA0000000) + 0x850)) =
cpu_to_le32(0);
*((__u32 *) (((unsigned)(0x14000000)|0xA0000000) + 0x850)) =
cpu_to_le32(50000000/HZ);
*((__u32 *) (((unsigned)(0x14000000)|0xA0000000) + 0xC1C)) =
cpu_to_le32(0x100);
*((__u32 *) (((unsigned)(0x14000000)|0xA0000000) + 0x864)) =
cpu_to_le32(0x03);
*((__u32 *) (((unsigned)(0x14000000)|0xA0000000) + 0xC18)) =
cpu_to_le32(0);
}
int get_irq_list(char *buf)
{
int i, len = 0, j;
struct irqaction * action;
len += sprintf(buf+len, " ");
for (j=0; j<smp_num_cpus; j++)
len += sprintf(buf+len, "CPU%d ",j);
*(char *)(buf+len++) = '\n';
for (i = 0 ; i < NR_IRQS ; i++) {
action = irq_desc[i].action;
if ( !action || !action->handler )
continue;
len += sprintf(buf+len, "%3d: ", i);
len += sprintf(buf+len, "%10u ", kstat_irqs(i));
if ( irq_desc[i].handler )
len += sprintf(buf+len, " %s ", irq_desc[i].handler->typename );
else
len += sprintf(buf+len, " None ");
len += sprintf(buf+len, " %s",action->name);
for (action=action->next; action; action = action->next) {
len += sprintf(buf+len, ", %s", action->name);
}
len += sprintf(buf+len, "\n");
}
len += sprintf(buf+len, "BAD: %10lu\n", spurious_count);
return len;
}
asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
{
struct irqaction *action;
int cpu;
int status;
cpu = smp_processor_id();
irq_enter(cpu);
kstat.irqs[cpu][irq]++;
status = 0;
if (irq_desc[irq].handler->ack)
irq_desc[irq].handler->ack(irq);
action = irq_desc[irq].action;
if (action && action->handler)
{
if (!(action->flags & SA_INTERRUPT))
__sti();
do {
status |= action->flags;
action->handler(irq, action->dev_id, regs);
action = action->next;
} while ( action );
__cli();
if (irq_desc[irq].handler)
{
if (irq_desc[irq].handler->end)
irq_desc[irq].handler->end(irq);
else if (irq_desc[irq].handler->enable)
irq_desc[irq].handler->enable(irq);
}
}
else
{
spurious_count++;
printk(KERN_DEBUG "Unhandled interrupt %x, disabled\n", irq);
disable_irq(irq);
if (irq_desc[irq].handler->end)
irq_desc[irq].handler->end(irq);
}
irq_exit(cpu);
if (softirq_active(cpu) & softirq_mask(cpu))
do_softirq();
}
int request_irq(unsigned int irq, void (*handler)(int, void *, struct pt_regs *),
unsigned long irqflags, const char * devname, void *dev_id)
{
struct irqaction *old, **p, *action;
unsigned long flags;
if (irq >= NR_IRQS)
return -EINVAL;
if (!handler)
{
/* Free */
for (p = &irq_desc[irq].action; (action = *p) != NULL; p = &action->next)
{
/* Found it - now free it */
save_flags(flags);
cli();
*p = action->next;
restore_flags(flags);
kfree(action);
return 0;
}
return -ENOENT;
}
action = (struct irqaction *)
kmalloc(sizeof(struct irqaction), GFP_KERNEL);
if (!action)
return -ENOMEM;
save_flags(flags);
cli();
action->handler = handler;
action->flags = irqflags;
action->mask = 0;
action->name = devname;
action->dev_id = dev_id;
action->next = NULL;
enable_irq(irq);
p = &irq_desc[irq].action;
if ((old = *p) != NULL) {
/* Can't share interrupts unless both agree to */
if (!(old->flags & action->flags & SA_SHIRQ))
return -EBUSY;
/* add new interrupt at end of irq queue */
do {
p = &old->next;
old = *p;
} while (old);
}
*p = action;
restore_flags(flags);
return 0;
}
void free_irq(unsigned int irq, void *dev_id)
{
request_irq(irq, NULL, 0, NULL, dev_id);
}
unsigned long probe_irq_on (void)
{
return 0;
}
int probe_irq_off (unsigned long irqs)
{
return 0;
}
void __init init_IRQ(void)
{
set_except_vector(0, orionIRQ);
}
|
