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1
/*
2
 * TI OMAP interrupt controller emulation.
3
 *
4
 * Copyright (C) 2006-2008 Andrzej Zaborowski  <balrog@zabor.org>
5
 * Copyright (C) 2007-2008 Nokia Corporation
6
 *
7
 * This program is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU General Public License as
9
 * published by the Free Software Foundation; either version 2 or
10
 * (at your option) version 3 of the License.
11
 *
12
 * This program is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
16
 *
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 * You should have received a copy of the GNU General Public License along
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 * with this program; if not, see <http://www.gnu.org/licenses/>.
19
 */
20
#include "hw.h"
21
#include "omap.h"
22
#include "sysbus.h"
23

    
24
/* Interrupt Handlers */
25
struct omap_intr_handler_bank_s {
26
    uint32_t irqs;
27
    uint32_t inputs;
28
    uint32_t mask;
29
    uint32_t fiq;
30
    uint32_t sens_edge;
31
    uint32_t swi;
32
    unsigned char priority[32];
33
};
34

    
35
struct omap_intr_handler_s {
36
    SysBusDevice busdev;
37
    qemu_irq *pins;
38
    qemu_irq parent_intr[2];
39
    MemoryRegion mmio;
40
    void *iclk;
41
    void *fclk;
42
    unsigned char nbanks;
43
    int level_only;
44
    uint32_t size;
45

    
46
    uint8_t revision;
47

    
48
    /* state */
49
    uint32_t new_agr[2];
50
    int sir_intr[2];
51
    int autoidle;
52
    uint32_t mask;
53
    struct omap_intr_handler_bank_s bank[3];
54
};
55

    
56
static void omap_inth_sir_update(struct omap_intr_handler_s *s, int is_fiq)
57
{
58
    int i, j, sir_intr, p_intr, p, f;
59
    uint32_t level;
60
    sir_intr = 0;
61
    p_intr = 255;
62

    
63
    /* Find the interrupt line with the highest dynamic priority.
64
     * Note: 0 denotes the hightest priority.
65
     * If all interrupts have the same priority, the default order is IRQ_N,
66
     * IRQ_N-1,...,IRQ_0. */
67
    for (j = 0; j < s->nbanks; ++j) {
68
        level = s->bank[j].irqs & ~s->bank[j].mask &
69
                (is_fiq ? s->bank[j].fiq : ~s->bank[j].fiq);
70
        for (f = ffs(level), i = f - 1, level >>= f - 1; f; i += f,
71
                        level >>= f) {
72
            p = s->bank[j].priority[i];
73
            if (p <= p_intr) {
74
                p_intr = p;
75
                sir_intr = 32 * j + i;
76
            }
77
            f = ffs(level >> 1);
78
        }
79
    }
80
    s->sir_intr[is_fiq] = sir_intr;
81
}
82

    
83
static inline void omap_inth_update(struct omap_intr_handler_s *s, int is_fiq)
84
{
85
    int i;
86
    uint32_t has_intr = 0;
87

    
88
    for (i = 0; i < s->nbanks; ++i)
89
        has_intr |= s->bank[i].irqs & ~s->bank[i].mask &
90
                (is_fiq ? s->bank[i].fiq : ~s->bank[i].fiq);
91

    
92
    if (s->new_agr[is_fiq] & has_intr & s->mask) {
93
        s->new_agr[is_fiq] = 0;
94
        omap_inth_sir_update(s, is_fiq);
95
        qemu_set_irq(s->parent_intr[is_fiq], 1);
96
    }
97
}
98

    
99
#define INT_FALLING_EDGE        0
100
#define INT_LOW_LEVEL                1
101

    
102
static void omap_set_intr(void *opaque, int irq, int req)
103
{
104
    struct omap_intr_handler_s *ih = (struct omap_intr_handler_s *) opaque;
105
    uint32_t rise;
106

    
107
    struct omap_intr_handler_bank_s *bank = &ih->bank[irq >> 5];
108
    int n = irq & 31;
109

    
110
    if (req) {
111
        rise = ~bank->irqs & (1 << n);
112
        if (~bank->sens_edge & (1 << n))
113
            rise &= ~bank->inputs;
114

    
115
        bank->inputs |= (1 << n);
116
        if (rise) {
117
            bank->irqs |= rise;
118
            omap_inth_update(ih, 0);
119
            omap_inth_update(ih, 1);
120
        }
121
    } else {
122
        rise = bank->sens_edge & bank->irqs & (1 << n);
123
        bank->irqs &= ~rise;
124
        bank->inputs &= ~(1 << n);
125
    }
126
}
127

    
128
/* Simplified version with no edge detection */
129
static void omap_set_intr_noedge(void *opaque, int irq, int req)
130
{
131
    struct omap_intr_handler_s *ih = (struct omap_intr_handler_s *) opaque;
132
    uint32_t rise;
133

    
134
    struct omap_intr_handler_bank_s *bank = &ih->bank[irq >> 5];
135
    int n = irq & 31;
136

    
137
    if (req) {
138
        rise = ~bank->inputs & (1 << n);
139
        if (rise) {
140
            bank->irqs |= bank->inputs |= rise;
141
            omap_inth_update(ih, 0);
142
            omap_inth_update(ih, 1);
143
        }
144
    } else
145
        bank->irqs = (bank->inputs &= ~(1 << n)) | bank->swi;
146
}
147

    
148
static uint64_t omap_inth_read(void *opaque, target_phys_addr_t addr,
149
                               unsigned size)
150
{
151
    struct omap_intr_handler_s *s = (struct omap_intr_handler_s *) opaque;
152
    int i, offset = addr;
153
    int bank_no = offset >> 8;
154
    int line_no;
155
    struct omap_intr_handler_bank_s *bank = &s->bank[bank_no];
156
    offset &= 0xff;
157

    
158
    switch (offset) {
159
    case 0x00:        /* ITR */
160
        return bank->irqs;
161

    
162
    case 0x04:        /* MIR */
163
        return bank->mask;
164

    
165
    case 0x10:        /* SIR_IRQ_CODE */
166
    case 0x14:  /* SIR_FIQ_CODE */
167
        if (bank_no != 0)
168
            break;
169
        line_no = s->sir_intr[(offset - 0x10) >> 2];
170
        bank = &s->bank[line_no >> 5];
171
        i = line_no & 31;
172
        if (((bank->sens_edge >> i) & 1) == INT_FALLING_EDGE)
173
            bank->irqs &= ~(1 << i);
174
        return line_no;
175

    
176
    case 0x18:        /* CONTROL_REG */
177
        if (bank_no != 0)
178
            break;
179
        return 0;
180

    
181
    case 0x1c:        /* ILR0 */
182
    case 0x20:        /* ILR1 */
183
    case 0x24:        /* ILR2 */
184
    case 0x28:        /* ILR3 */
185
    case 0x2c:        /* ILR4 */
186
    case 0x30:        /* ILR5 */
187
    case 0x34:        /* ILR6 */
188
    case 0x38:        /* ILR7 */
189
    case 0x3c:        /* ILR8 */
190
    case 0x40:        /* ILR9 */
191
    case 0x44:        /* ILR10 */
192
    case 0x48:        /* ILR11 */
193
    case 0x4c:        /* ILR12 */
194
    case 0x50:        /* ILR13 */
195
    case 0x54:        /* ILR14 */
196
    case 0x58:        /* ILR15 */
197
    case 0x5c:        /* ILR16 */
198
    case 0x60:        /* ILR17 */
199
    case 0x64:        /* ILR18 */
200
    case 0x68:        /* ILR19 */
201
    case 0x6c:        /* ILR20 */
202
    case 0x70:        /* ILR21 */
203
    case 0x74:        /* ILR22 */
204
    case 0x78:        /* ILR23 */
205
    case 0x7c:        /* ILR24 */
206
    case 0x80:        /* ILR25 */
207
    case 0x84:        /* ILR26 */
208
    case 0x88:        /* ILR27 */
209
    case 0x8c:        /* ILR28 */
210
    case 0x90:        /* ILR29 */
211
    case 0x94:        /* ILR30 */
212
    case 0x98:        /* ILR31 */
213
        i = (offset - 0x1c) >> 2;
214
        return (bank->priority[i] << 2) |
215
                (((bank->sens_edge >> i) & 1) << 1) |
216
                ((bank->fiq >> i) & 1);
217

    
218
    case 0x9c:        /* ISR */
219
        return 0x00000000;
220

    
221
    }
222
    OMAP_BAD_REG(addr);
223
    return 0;
224
}
225

    
226
static void omap_inth_write(void *opaque, target_phys_addr_t addr,
227
                            uint64_t value, unsigned size)
228
{
229
    struct omap_intr_handler_s *s = (struct omap_intr_handler_s *) opaque;
230
    int i, offset = addr;
231
    int bank_no = offset >> 8;
232
    struct omap_intr_handler_bank_s *bank = &s->bank[bank_no];
233
    offset &= 0xff;
234

    
235
    switch (offset) {
236
    case 0x00:        /* ITR */
237
        /* Important: ignore the clearing if the IRQ is level-triggered and
238
           the input bit is 1 */
239
        bank->irqs &= value | (bank->inputs & bank->sens_edge);
240
        return;
241

    
242
    case 0x04:        /* MIR */
243
        bank->mask = value;
244
        omap_inth_update(s, 0);
245
        omap_inth_update(s, 1);
246
        return;
247

    
248
    case 0x10:        /* SIR_IRQ_CODE */
249
    case 0x14:        /* SIR_FIQ_CODE */
250
        OMAP_RO_REG(addr);
251
        break;
252

    
253
    case 0x18:        /* CONTROL_REG */
254
        if (bank_no != 0)
255
            break;
256
        if (value & 2) {
257
            qemu_set_irq(s->parent_intr[1], 0);
258
            s->new_agr[1] = ~0;
259
            omap_inth_update(s, 1);
260
        }
261
        if (value & 1) {
262
            qemu_set_irq(s->parent_intr[0], 0);
263
            s->new_agr[0] = ~0;
264
            omap_inth_update(s, 0);
265
        }
266
        return;
267

    
268
    case 0x1c:        /* ILR0 */
269
    case 0x20:        /* ILR1 */
270
    case 0x24:        /* ILR2 */
271
    case 0x28:        /* ILR3 */
272
    case 0x2c:        /* ILR4 */
273
    case 0x30:        /* ILR5 */
274
    case 0x34:        /* ILR6 */
275
    case 0x38:        /* ILR7 */
276
    case 0x3c:        /* ILR8 */
277
    case 0x40:        /* ILR9 */
278
    case 0x44:        /* ILR10 */
279
    case 0x48:        /* ILR11 */
280
    case 0x4c:        /* ILR12 */
281
    case 0x50:        /* ILR13 */
282
    case 0x54:        /* ILR14 */
283
    case 0x58:        /* ILR15 */
284
    case 0x5c:        /* ILR16 */
285
    case 0x60:        /* ILR17 */
286
    case 0x64:        /* ILR18 */
287
    case 0x68:        /* ILR19 */
288
    case 0x6c:        /* ILR20 */
289
    case 0x70:        /* ILR21 */
290
    case 0x74:        /* ILR22 */
291
    case 0x78:        /* ILR23 */
292
    case 0x7c:        /* ILR24 */
293
    case 0x80:        /* ILR25 */
294
    case 0x84:        /* ILR26 */
295
    case 0x88:        /* ILR27 */
296
    case 0x8c:        /* ILR28 */
297
    case 0x90:        /* ILR29 */
298
    case 0x94:        /* ILR30 */
299
    case 0x98:        /* ILR31 */
300
        i = (offset - 0x1c) >> 2;
301
        bank->priority[i] = (value >> 2) & 0x1f;
302
        bank->sens_edge &= ~(1 << i);
303
        bank->sens_edge |= ((value >> 1) & 1) << i;
304
        bank->fiq &= ~(1 << i);
305
        bank->fiq |= (value & 1) << i;
306
        return;
307

    
308
    case 0x9c:        /* ISR */
309
        for (i = 0; i < 32; i ++)
310
            if (value & (1 << i)) {
311
                omap_set_intr(s, 32 * bank_no + i, 1);
312
                return;
313
            }
314
        return;
315
    }
316
    OMAP_BAD_REG(addr);
317
}
318

    
319
static const MemoryRegionOps omap_inth_mem_ops = {
320
    .read = omap_inth_read,
321
    .write = omap_inth_write,
322
    .endianness = DEVICE_NATIVE_ENDIAN,
323
    .valid = {
324
        .min_access_size = 4,
325
        .max_access_size = 4,
326
    },
327
};
328

    
329
static void omap_inth_reset(DeviceState *dev)
330
{
331
    struct omap_intr_handler_s *s = FROM_SYSBUS(struct omap_intr_handler_s,
332
                                                sysbus_from_qdev(dev));
333
    int i;
334

    
335
    for (i = 0; i < s->nbanks; ++i){
336
        s->bank[i].irqs = 0x00000000;
337
        s->bank[i].mask = 0xffffffff;
338
        s->bank[i].sens_edge = 0x00000000;
339
        s->bank[i].fiq = 0x00000000;
340
        s->bank[i].inputs = 0x00000000;
341
        s->bank[i].swi = 0x00000000;
342
        memset(s->bank[i].priority, 0, sizeof(s->bank[i].priority));
343

    
344
        if (s->level_only)
345
            s->bank[i].sens_edge = 0xffffffff;
346
    }
347

    
348
    s->new_agr[0] = ~0;
349
    s->new_agr[1] = ~0;
350
    s->sir_intr[0] = 0;
351
    s->sir_intr[1] = 0;
352
    s->autoidle = 0;
353
    s->mask = ~0;
354

    
355
    qemu_set_irq(s->parent_intr[0], 0);
356
    qemu_set_irq(s->parent_intr[1], 0);
357
}
358

    
359
static int omap_intc_init(SysBusDevice *dev)
360
{
361
    struct omap_intr_handler_s *s;
362
    s = FROM_SYSBUS(struct omap_intr_handler_s, dev);
363
    if (!s->iclk) {
364
        hw_error("omap-intc: clk not connected\n");
365
    }
366
    s->nbanks = 1;
367
    sysbus_init_irq(dev, &s->parent_intr[0]);
368
    sysbus_init_irq(dev, &s->parent_intr[1]);
369
    qdev_init_gpio_in(&dev->qdev, omap_set_intr, s->nbanks * 32);
370
    memory_region_init_io(&s->mmio, &omap_inth_mem_ops, s,
371
                          "omap-intc", s->size);
372
    sysbus_init_mmio(dev, &s->mmio);
373
    return 0;
374
}
375

    
376
static SysBusDeviceInfo omap_intc_info = {
377
    .init = omap_intc_init,
378
    .qdev.name = "omap-intc",
379
    .qdev.size = sizeof(struct omap_intr_handler_s),
380
    .qdev.reset = omap_inth_reset,
381
    .qdev.props = (Property[]) {
382
        DEFINE_PROP_UINT32("size", struct omap_intr_handler_s, size, 0x100),
383
        DEFINE_PROP_PTR("clk", struct omap_intr_handler_s, iclk),
384
        DEFINE_PROP_END_OF_LIST()
385
    }
386
};
387

    
388
static uint64_t omap2_inth_read(void *opaque, target_phys_addr_t addr,
389
                                unsigned size)
390
{
391
    struct omap_intr_handler_s *s = (struct omap_intr_handler_s *) opaque;
392
    int offset = addr;
393
    int bank_no, line_no;
394
    struct omap_intr_handler_bank_s *bank = NULL;
395

    
396
    if ((offset & 0xf80) == 0x80) {
397
        bank_no = (offset & 0x60) >> 5;
398
        if (bank_no < s->nbanks) {
399
            offset &= ~0x60;
400
            bank = &s->bank[bank_no];
401
        } else {
402
            OMAP_BAD_REG(addr);
403
            return 0;
404
        }
405
    }
406

    
407
    switch (offset) {
408
    case 0x00:        /* INTC_REVISION */
409
        return s->revision;
410

    
411
    case 0x10:        /* INTC_SYSCONFIG */
412
        return (s->autoidle >> 2) & 1;
413

    
414
    case 0x14:        /* INTC_SYSSTATUS */
415
        return 1;                                                /* RESETDONE */
416

    
417
    case 0x40:        /* INTC_SIR_IRQ */
418
        return s->sir_intr[0];
419

    
420
    case 0x44:        /* INTC_SIR_FIQ */
421
        return s->sir_intr[1];
422

    
423
    case 0x48:        /* INTC_CONTROL */
424
        return (!s->mask) << 2;                                        /* GLOBALMASK */
425

    
426
    case 0x4c:        /* INTC_PROTECTION */
427
        return 0;
428

    
429
    case 0x50:        /* INTC_IDLE */
430
        return s->autoidle & 3;
431

    
432
    /* Per-bank registers */
433
    case 0x80:        /* INTC_ITR */
434
        return bank->inputs;
435

    
436
    case 0x84:        /* INTC_MIR */
437
        return bank->mask;
438

    
439
    case 0x88:        /* INTC_MIR_CLEAR */
440
    case 0x8c:        /* INTC_MIR_SET */
441
        return 0;
442

    
443
    case 0x90:        /* INTC_ISR_SET */
444
        return bank->swi;
445

    
446
    case 0x94:        /* INTC_ISR_CLEAR */
447
        return 0;
448

    
449
    case 0x98:        /* INTC_PENDING_IRQ */
450
        return bank->irqs & ~bank->mask & ~bank->fiq;
451

    
452
    case 0x9c:        /* INTC_PENDING_FIQ */
453
        return bank->irqs & ~bank->mask & bank->fiq;
454

    
455
    /* Per-line registers */
456
    case 0x100 ... 0x300:        /* INTC_ILR */
457
        bank_no = (offset - 0x100) >> 7;
458
        if (bank_no > s->nbanks)
459
            break;
460
        bank = &s->bank[bank_no];
461
        line_no = (offset & 0x7f) >> 2;
462
        return (bank->priority[line_no] << 2) |
463
                ((bank->fiq >> line_no) & 1);
464
    }
465
    OMAP_BAD_REG(addr);
466
    return 0;
467
}
468

    
469
static void omap2_inth_write(void *opaque, target_phys_addr_t addr,
470
                             uint64_t value, unsigned size)
471
{
472
    struct omap_intr_handler_s *s = (struct omap_intr_handler_s *) opaque;
473
    int offset = addr;
474
    int bank_no, line_no;
475
    struct omap_intr_handler_bank_s *bank = NULL;
476

    
477
    if ((offset & 0xf80) == 0x80) {
478
        bank_no = (offset & 0x60) >> 5;
479
        if (bank_no < s->nbanks) {
480
            offset &= ~0x60;
481
            bank = &s->bank[bank_no];
482
        } else {
483
            OMAP_BAD_REG(addr);
484
            return;
485
        }
486
    }
487

    
488
    switch (offset) {
489
    case 0x10:        /* INTC_SYSCONFIG */
490
        s->autoidle &= 4;
491
        s->autoidle |= (value & 1) << 2;
492
        if (value & 2)                                                /* SOFTRESET */
493
            omap_inth_reset(&s->busdev.qdev);
494
        return;
495

    
496
    case 0x48:        /* INTC_CONTROL */
497
        s->mask = (value & 4) ? 0 : ~0;                                /* GLOBALMASK */
498
        if (value & 2) {                                        /* NEWFIQAGR */
499
            qemu_set_irq(s->parent_intr[1], 0);
500
            s->new_agr[1] = ~0;
501
            omap_inth_update(s, 1);
502
        }
503
        if (value & 1) {                                        /* NEWIRQAGR */
504
            qemu_set_irq(s->parent_intr[0], 0);
505
            s->new_agr[0] = ~0;
506
            omap_inth_update(s, 0);
507
        }
508
        return;
509

    
510
    case 0x4c:        /* INTC_PROTECTION */
511
        /* TODO: Make a bitmap (or sizeof(char)map) of access privileges
512
         * for every register, see Chapter 3 and 4 for privileged mode.  */
513
        if (value & 1)
514
            fprintf(stderr, "%s: protection mode enable attempt\n",
515
                            __FUNCTION__);
516
        return;
517

    
518
    case 0x50:        /* INTC_IDLE */
519
        s->autoidle &= ~3;
520
        s->autoidle |= value & 3;
521
        return;
522

    
523
    /* Per-bank registers */
524
    case 0x84:        /* INTC_MIR */
525
        bank->mask = value;
526
        omap_inth_update(s, 0);
527
        omap_inth_update(s, 1);
528
        return;
529

    
530
    case 0x88:        /* INTC_MIR_CLEAR */
531
        bank->mask &= ~value;
532
        omap_inth_update(s, 0);
533
        omap_inth_update(s, 1);
534
        return;
535

    
536
    case 0x8c:        /* INTC_MIR_SET */
537
        bank->mask |= value;
538
        return;
539

    
540
    case 0x90:        /* INTC_ISR_SET */
541
        bank->irqs |= bank->swi |= value;
542
        omap_inth_update(s, 0);
543
        omap_inth_update(s, 1);
544
        return;
545

    
546
    case 0x94:        /* INTC_ISR_CLEAR */
547
        bank->swi &= ~value;
548
        bank->irqs = bank->swi & bank->inputs;
549
        return;
550

    
551
    /* Per-line registers */
552
    case 0x100 ... 0x300:        /* INTC_ILR */
553
        bank_no = (offset - 0x100) >> 7;
554
        if (bank_no > s->nbanks)
555
            break;
556
        bank = &s->bank[bank_no];
557
        line_no = (offset & 0x7f) >> 2;
558
        bank->priority[line_no] = (value >> 2) & 0x3f;
559
        bank->fiq &= ~(1 << line_no);
560
        bank->fiq |= (value & 1) << line_no;
561
        return;
562

    
563
    case 0x00:        /* INTC_REVISION */
564
    case 0x14:        /* INTC_SYSSTATUS */
565
    case 0x40:        /* INTC_SIR_IRQ */
566
    case 0x44:        /* INTC_SIR_FIQ */
567
    case 0x80:        /* INTC_ITR */
568
    case 0x98:        /* INTC_PENDING_IRQ */
569
    case 0x9c:        /* INTC_PENDING_FIQ */
570
        OMAP_RO_REG(addr);
571
        return;
572
    }
573
    OMAP_BAD_REG(addr);
574
}
575

    
576
static const MemoryRegionOps omap2_inth_mem_ops = {
577
    .read = omap2_inth_read,
578
    .write = omap2_inth_write,
579
    .endianness = DEVICE_NATIVE_ENDIAN,
580
    .valid = {
581
        .min_access_size = 4,
582
        .max_access_size = 4,
583
    },
584
};
585

    
586
static int omap2_intc_init(SysBusDevice *dev)
587
{
588
    struct omap_intr_handler_s *s;
589
    s = FROM_SYSBUS(struct omap_intr_handler_s, dev);
590
    if (!s->iclk) {
591
        hw_error("omap2-intc: iclk not connected\n");
592
    }
593
    if (!s->fclk) {
594
        hw_error("omap2-intc: fclk not connected\n");
595
    }
596
    s->level_only = 1;
597
    s->nbanks = 3;
598
    sysbus_init_irq(dev, &s->parent_intr[0]);
599
    sysbus_init_irq(dev, &s->parent_intr[1]);
600
    qdev_init_gpio_in(&dev->qdev, omap_set_intr_noedge, s->nbanks * 32);
601
    memory_region_init_io(&s->mmio, &omap2_inth_mem_ops, s,
602
                          "omap2-intc", 0x1000);
603
    sysbus_init_mmio(dev, &s->mmio);
604
    return 0;
605
}
606

    
607
static SysBusDeviceInfo omap2_intc_info = {
608
    .init = omap2_intc_init,
609
    .qdev.name = "omap2-intc",
610
    .qdev.size = sizeof(struct omap_intr_handler_s),
611
    .qdev.reset = omap_inth_reset,
612
    .qdev.props = (Property[]) {
613
        DEFINE_PROP_UINT8("revision", struct omap_intr_handler_s,
614
                          revision, 0x21),
615
        DEFINE_PROP_PTR("iclk", struct omap_intr_handler_s, iclk),
616
        DEFINE_PROP_PTR("fclk", struct omap_intr_handler_s, fclk),
617
        DEFINE_PROP_END_OF_LIST()
618
    }
619
};
620

    
621
static void omap_intc_register_device(void)
622
{
623
    sysbus_register_withprop(&omap_intc_info);
624
    sysbus_register_withprop(&omap2_intc_info);
625
}
626

    
627
device_init(omap_intc_register_device)