aboutsummaryrefslogtreecommitdiff
path: root/arch/m68k/kernel/ints.c
blob: 84aceca6c05c16297ce244431c1cbdb0f741a441 (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
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
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
/*
 * linux/arch/m68k/kernel/ints.c -- Linux/m68k general interrupt handling code
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 *
 * 07/03/96: Timer initialization, and thus mach_sched_init(),
 *           removed from request_irq() and moved to init_time().
 *           We should therefore consider renaming our add_isr() and
 *           remove_isr() to request_irq() and free_irq()
 *           respectively, so they are compliant with the other
 *           architectures.                                     /Jes
 * 11/07/96: Changed all add_/remove_isr() to request_/free_irq() calls.
 *           Removed irq list support, if any machine needs an irq server
 *           it must implement this itself (as it's already done), instead
 *           only default handler are used with mach_default_handler.
 *           request_irq got some flags different from other architectures:
 *           - IRQ_FLG_REPLACE : Replace an existing handler (the default one
 *                               can be replaced without this flag)
 *           - IRQ_FLG_LOCK : handler can't be replaced
 *           There are other machine depending flags, see there
 *           If you want to replace a default handler you should know what
 *           you're doing, since it might handle different other irq sources
 *           which must be served                               /Roman Zippel
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <linux/errno.h>
#include <linux/init.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>
#include <asm/cacheflush.h>
#include <asm/irq_regs.h>

#ifdef CONFIG_Q40
#include <asm/q40ints.h>
#endif

extern u32 auto_irqhandler_fixup[];
extern u32 user_irqhandler_fixup[];
extern u16 user_irqvec_fixup[];

/* table for system interrupt handlers */
static struct irq_node *irq_list[NR_IRQS];
static struct irq_controller *irq_controller[NR_IRQS];
static int irq_depth[NR_IRQS];

static int m68k_first_user_vec;

static struct irq_controller auto_irq_controller = {
	.name		= "auto",
	.lock		= SPIN_LOCK_UNLOCKED,
	.startup	= m68k_irq_startup,
	.shutdown	= m68k_irq_shutdown,
};

static struct irq_controller user_irq_controller = {
	.name		= "user",
	.lock		= SPIN_LOCK_UNLOCKED,
	.startup	= m68k_irq_startup,
	.shutdown	= m68k_irq_shutdown,
};

#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.
 */

void __init init_IRQ(void)
{
	int i;

	/* assembly irq entry code relies on this... */
	if (HARDIRQ_MASK != 0x00ff0000) {
		extern void hardirq_mask_is_broken(void);
		hardirq_mask_is_broken();
	}

	for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++)
		irq_controller[i] = &auto_irq_controller;

	mach_init_IRQ();
}

/**
 * m68k_setup_auto_interrupt
 * @handler: called from auto vector interrupts
 *
 * setup the handler to be called from auto vector interrupts instead of the
 * standard __m68k_handle_int(), it will be called with irq numbers in the range
 * from IRQ_AUTO_1 - IRQ_AUTO_7.
 */
void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *))
{
	if (handler)
		*auto_irqhandler_fixup = (u32)handler;
	flush_icache();
}

/**
 * m68k_setup_user_interrupt
 * @vec: first user vector interrupt to handle
 * @cnt: number of active user vector interrupts
 * @handler: called from user vector interrupts
 *
 * setup user vector interrupts, this includes activating the specified range
 * of interrupts, only then these interrupts can be requested (note: this is
 * different from auto vector interrupts). An optional handler can be installed
 * to be called instead of the default __m68k_handle_int(), it will be called
 * with irq numbers starting from IRQ_USER.
 */
void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt,
				      void (*handler)(unsigned int, struct pt_regs *))
{
	int i;

	BUG_ON(IRQ_USER + cnt >= NR_IRQS);
	m68k_first_user_vec = vec;
	for (i = 0; i < cnt; i++)
		irq_controller[IRQ_USER + i] = &user_irq_controller;
	*user_irqvec_fixup = vec - IRQ_USER;
	if (handler)
		*user_irqhandler_fixup = (u32)handler;
	flush_icache();
}

/**
 * m68k_setup_irq_controller
 * @contr: irq controller which controls specified irq
 * @irq: first irq to be managed by the controller
 *
 * Change the controller for the specified range of irq, which will be used to
 * manage these irq. auto/user irq already have a default controller, which can
 * be changed as well, but the controller probably should use m68k_irq_startup/
 * m68k_irq_shutdown.
 */
void m68k_setup_irq_controller(struct irq_controller *contr, unsigned int irq,
			       unsigned int cnt)
{
	int i;

	for (i = 0; i < cnt; i++)
		irq_controller[irq + i] = contr;
}

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) {
			memset(node, 0, sizeof(*node));
			return node;
		}
	}

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

int setup_irq(unsigned int irq, struct irq_node *node)
{
	struct irq_controller *contr;
	struct irq_node **prev;
	unsigned long flags;

	if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
		printk("%s: Incorrect IRQ %d from %s\n",
		       __FUNCTION__, irq, node->devname);
		return -ENXIO;
	}

	spin_lock_irqsave(&contr->lock, flags);

	prev = irq_list + irq;
	if (*prev) {
		/* Can't share interrupts unless both agree to */
		if (!((*prev)->flags & node->flags & IRQF_SHARED)) {
			spin_unlock_irqrestore(&contr->lock, flags);
			return -EBUSY;
		}
		while (*prev)
			prev = &(*prev)->next;
	}

	if (!irq_list[irq]) {
		if (contr->startup)
			contr->startup(irq);
		else
			contr->enable(irq);
	}
	node->next = NULL;
	*prev = node;

	spin_unlock_irqrestore(&contr->lock, flags);

	return 0;
}

int request_irq(unsigned int irq,
		irq_handler_t handler,
		unsigned long flags, const char *devname, void *dev_id)
{
	struct irq_node *node;
	int res;

	node = new_irq_node();
	if (!node)
		return -ENOMEM;

	node->handler = handler;
	node->flags   = flags;
	node->dev_id  = dev_id;
	node->devname = devname;

	res = setup_irq(irq, node);
	if (res)
		node->handler = NULL;

	return res;
}

EXPORT_SYMBOL(request_irq);

void free_irq(unsigned int irq, void *dev_id)
{
	struct irq_controller *contr;
	struct irq_node **p, *node;
	unsigned long flags;

	if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
		printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
		return;
	}

	spin_lock_irqsave(&contr->lock, flags);

	p = irq_list + irq;
	while ((node = *p)) {
		if (node->dev_id == dev_id)
			break;
		p = &node->next;
	}

	if (node) {
		*p = node->next;
		node->handler = NULL;
	} else
		printk("%s: Removing probably wrong IRQ %d\n",
		       __FUNCTION__, irq);

	if (!irq_list[irq]) {
		if (contr->shutdown)
			contr->shutdown(irq);
		else
			contr->disable(irq);
	}

	spin_unlock_irqrestore(&contr->lock, flags);
}

EXPORT_SYMBOL(free_irq);

void enable_irq(unsigned int irq)
{
	struct irq_controller *contr;
	unsigned long flags;

	if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
		printk("%s: Incorrect IRQ %d\n",
		       __FUNCTION__, irq);
		return;
	}

	spin_lock_irqsave(&contr->lock, flags);
	if (irq_depth[irq]) {
		if (!--irq_depth[irq]) {
			if (contr->enable)
				contr->enable(irq);
		}
	} else
		WARN_ON(1);
	spin_unlock_irqrestore(&contr->lock, flags);
}

EXPORT_SYMBOL(enable_irq);

void disable_irq(unsigned int irq)
{
	struct irq_controller *contr;
	unsigned long flags;

	if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
		printk("%s: Incorrect IRQ %d\n",
		       __FUNCTION__, irq);
		return;
	}

	spin_lock_irqsave(&contr->lock, flags);
	if (!irq_depth[irq]++) {
		if (contr->disable)
			contr->disable(irq);
	}
	spin_unlock_irqrestore(&contr->lock, flags);
}

EXPORT_SYMBOL(disable_irq);

int m68k_irq_startup(unsigned int irq)
{
	if (irq <= IRQ_AUTO_7)
		vectors[VEC_SPUR + irq] = auto_inthandler;
	else
		vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler;
	return 0;
}

void m68k_irq_shutdown(unsigned int irq)
{
	if (irq <= IRQ_AUTO_7)
		vectors[VEC_SPUR + irq] = bad_inthandler;
	else
		vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler;
}


/*
 * Do we need these probe functions on the m68k?
 *
 *  ... may be useful with ISA devices
 */
unsigned long probe_irq_on (void)
{
#ifdef CONFIG_Q40
	if (MACH_IS_Q40)
		return q40_probe_irq_on();
#endif
	return 0;
}

EXPORT_SYMBOL(probe_irq_on);

int probe_irq_off (unsigned long irqs)
{
#ifdef CONFIG_Q40
	if (MACH_IS_Q40)
		return q40_probe_irq_off(irqs);
#endif
	return 0;
}

EXPORT_SYMBOL(probe_irq_off);

unsigned int irq_canonicalize(unsigned int irq)
{
#ifdef CONFIG_Q40
	if (MACH_IS_Q40 && irq == 11)
		irq = 10;
#endif
	return irq;
}

EXPORT_SYMBOL(irq_canonicalize);

asmlinkage void m68k_handle_int(unsigned int irq)
{
	struct irq_node *node;
	kstat_cpu(0).irqs[irq]++;
	node = irq_list[irq];
	do {
		node->handler(irq, node->dev_id);
		node = node->next;
	} while (node);
}

asmlinkage void __m68k_handle_int(unsigned int irq, struct pt_regs *regs)
{
	struct pt_regs *old_regs;
	old_regs = set_irq_regs(regs);
	m68k_handle_int(irq);
	set_irq_regs(old_regs);
}

asmlinkage void handle_badint(struct pt_regs *regs)
{
	kstat_cpu(0).irqs[0]++;
	printk("unexpected interrupt from %u\n", regs->vector);
}

int show_interrupts(struct seq_file *p, void *v)
{
	struct irq_controller *contr;
	struct irq_node *node;
	int i = *(loff_t *) v;

	/* autovector interrupts */
	if (irq_list[i]) {
		contr = irq_controller[i];
		node = irq_list[i];
		seq_printf(p, "%-8s %3u: %10u %s", contr->name, i, kstat_cpu(0).irqs[i], node->devname);
		while ((node = node->next))
			seq_printf(p, ", %s", node->devname);
		seq_puts(p, "\n");
	}
	return 0;
}

void init_irq_proc(void)
{
	/* Insert /proc/irq driver here */
}