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 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License along 18 * with this program; if not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #include "qemu/osdep.h" 22 #include "hw/irq.h" 23 #include "hw/qdev-properties.h" 24 #include "hw/arm/omap.h" 25 #include "hw/sysbus.h" 26 #include "qemu/error-report.h" 27 #include "qemu/module.h" 28 #include "qapi/error.h" 29 30 /* Interrupt Handlers */ 31 struct omap_intr_handler_bank_s { 32 uint32_t irqs; 33 uint32_t inputs; 34 uint32_t mask; 35 uint32_t fiq; 36 uint32_t sens_edge; 37 uint32_t swi; 38 unsigned char priority[32]; 39 }; 40 41 struct OMAPIntcState { 42 SysBusDevice parent_obj; 43 44 qemu_irq *pins; 45 qemu_irq parent_intr[2]; 46 MemoryRegion mmio; 47 void *iclk; 48 void *fclk; 49 unsigned char nbanks; 50 int level_only; 51 uint32_t size; 52 53 uint8_t revision; 54 55 /* state */ 56 uint32_t new_agr[2]; 57 int sir_intr[2]; 58 int autoidle; 59 uint32_t mask; 60 struct omap_intr_handler_bank_s bank[3]; 61 }; 62 63 static void omap_inth_sir_update(OMAPIntcState *s, int is_fiq) 64 { 65 int i, j, sir_intr, p_intr, p; 66 uint32_t level; 67 sir_intr = 0; 68 p_intr = 255; 69 70 /* Find the interrupt line with the highest dynamic priority. 71 * Note: 0 denotes the highest priority. 72 * If all interrupts have the same priority, the default order is IRQ_N, 73 * IRQ_N-1,...,IRQ_0. */ 74 for (j = 0; j < s->nbanks; ++j) { 75 level = s->bank[j].irqs & ~s->bank[j].mask & 76 (is_fiq ? s->bank[j].fiq : ~s->bank[j].fiq); 77 78 while (level != 0) { 79 i = ctz32(level); 80 p = s->bank[j].priority[i]; 81 if (p <= p_intr) { 82 p_intr = p; 83 sir_intr = 32 * j + i; 84 } 85 level &= level - 1; 86 } 87 } 88 s->sir_intr[is_fiq] = sir_intr; 89 } 90 91 static inline void omap_inth_update(OMAPIntcState *s, int is_fiq) 92 { 93 int i; 94 uint32_t has_intr = 0; 95 96 for (i = 0; i < s->nbanks; ++i) 97 has_intr |= s->bank[i].irqs & ~s->bank[i].mask & 98 (is_fiq ? s->bank[i].fiq : ~s->bank[i].fiq); 99 100 if (s->new_agr[is_fiq] & has_intr & s->mask) { 101 s->new_agr[is_fiq] = 0; 102 omap_inth_sir_update(s, is_fiq); 103 qemu_set_irq(s->parent_intr[is_fiq], 1); 104 } 105 } 106 107 #define INT_FALLING_EDGE 0 108 #define INT_LOW_LEVEL 1 109 110 static void omap_set_intr(void *opaque, int irq, int req) 111 { 112 OMAPIntcState *ih = opaque; 113 uint32_t rise; 114 115 struct omap_intr_handler_bank_s *bank = &ih->bank[irq >> 5]; 116 int n = irq & 31; 117 118 if (req) { 119 rise = ~bank->irqs & (1 << n); 120 if (~bank->sens_edge & (1 << n)) 121 rise &= ~bank->inputs; 122 123 bank->inputs |= (1 << n); 124 if (rise) { 125 bank->irqs |= rise; 126 omap_inth_update(ih, 0); 127 omap_inth_update(ih, 1); 128 } 129 } else { 130 rise = bank->sens_edge & bank->irqs & (1 << n); 131 bank->irqs &= ~rise; 132 bank->inputs &= ~(1 << n); 133 } 134 } 135 136 /* Simplified version with no edge detection */ 137 static void omap_set_intr_noedge(void *opaque, int irq, int req) 138 { 139 OMAPIntcState *ih = opaque; 140 uint32_t rise; 141 142 struct omap_intr_handler_bank_s *bank = &ih->bank[irq >> 5]; 143 int n = irq & 31; 144 145 if (req) { 146 rise = ~bank->inputs & (1 << n); 147 if (rise) { 148 bank->irqs |= bank->inputs |= rise; 149 omap_inth_update(ih, 0); 150 omap_inth_update(ih, 1); 151 } 152 } else 153 bank->irqs = (bank->inputs &= ~(1 << n)) | bank->swi; 154 } 155 156 static uint64_t omap_inth_read(void *opaque, hwaddr addr, 157 unsigned size) 158 { 159 OMAPIntcState *s = opaque; 160 int i, offset = addr; 161 int bank_no = offset >> 8; 162 int line_no; 163 struct omap_intr_handler_bank_s *bank = &s->bank[bank_no]; 164 offset &= 0xff; 165 166 switch (offset) { 167 case 0x00: /* ITR */ 168 return bank->irqs; 169 170 case 0x04: /* MIR */ 171 return bank->mask; 172 173 case 0x10: /* SIR_IRQ_CODE */ 174 case 0x14: /* SIR_FIQ_CODE */ 175 if (bank_no != 0) 176 break; 177 line_no = s->sir_intr[(offset - 0x10) >> 2]; 178 bank = &s->bank[line_no >> 5]; 179 i = line_no & 31; 180 if (((bank->sens_edge >> i) & 1) == INT_FALLING_EDGE) 181 bank->irqs &= ~(1 << i); 182 return line_no; 183 184 case 0x18: /* CONTROL_REG */ 185 if (bank_no != 0) 186 break; 187 return 0; 188 189 case 0x1c: /* ILR0 */ 190 case 0x20: /* ILR1 */ 191 case 0x24: /* ILR2 */ 192 case 0x28: /* ILR3 */ 193 case 0x2c: /* ILR4 */ 194 case 0x30: /* ILR5 */ 195 case 0x34: /* ILR6 */ 196 case 0x38: /* ILR7 */ 197 case 0x3c: /* ILR8 */ 198 case 0x40: /* ILR9 */ 199 case 0x44: /* ILR10 */ 200 case 0x48: /* ILR11 */ 201 case 0x4c: /* ILR12 */ 202 case 0x50: /* ILR13 */ 203 case 0x54: /* ILR14 */ 204 case 0x58: /* ILR15 */ 205 case 0x5c: /* ILR16 */ 206 case 0x60: /* ILR17 */ 207 case 0x64: /* ILR18 */ 208 case 0x68: /* ILR19 */ 209 case 0x6c: /* ILR20 */ 210 case 0x70: /* ILR21 */ 211 case 0x74: /* ILR22 */ 212 case 0x78: /* ILR23 */ 213 case 0x7c: /* ILR24 */ 214 case 0x80: /* ILR25 */ 215 case 0x84: /* ILR26 */ 216 case 0x88: /* ILR27 */ 217 case 0x8c: /* ILR28 */ 218 case 0x90: /* ILR29 */ 219 case 0x94: /* ILR30 */ 220 case 0x98: /* ILR31 */ 221 i = (offset - 0x1c) >> 2; 222 return (bank->priority[i] << 2) | 223 (((bank->sens_edge >> i) & 1) << 1) | 224 ((bank->fiq >> i) & 1); 225 226 case 0x9c: /* ISR */ 227 return 0x00000000; 228 229 } 230 OMAP_BAD_REG(addr); 231 return 0; 232 } 233 234 static void omap_inth_write(void *opaque, hwaddr addr, 235 uint64_t value, unsigned size) 236 { 237 OMAPIntcState *s = opaque; 238 int i, offset = addr; 239 int bank_no = offset >> 8; 240 struct omap_intr_handler_bank_s *bank = &s->bank[bank_no]; 241 offset &= 0xff; 242 243 switch (offset) { 244 case 0x00: /* ITR */ 245 /* Important: ignore the clearing if the IRQ is level-triggered and 246 the input bit is 1 */ 247 bank->irqs &= value | (bank->inputs & bank->sens_edge); 248 return; 249 250 case 0x04: /* MIR */ 251 bank->mask = value; 252 omap_inth_update(s, 0); 253 omap_inth_update(s, 1); 254 return; 255 256 case 0x10: /* SIR_IRQ_CODE */ 257 case 0x14: /* SIR_FIQ_CODE */ 258 OMAP_RO_REG(addr); 259 break; 260 261 case 0x18: /* CONTROL_REG */ 262 if (bank_no != 0) 263 break; 264 if (value & 2) { 265 qemu_set_irq(s->parent_intr[1], 0); 266 s->new_agr[1] = ~0; 267 omap_inth_update(s, 1); 268 } 269 if (value & 1) { 270 qemu_set_irq(s->parent_intr[0], 0); 271 s->new_agr[0] = ~0; 272 omap_inth_update(s, 0); 273 } 274 return; 275 276 case 0x1c: /* ILR0 */ 277 case 0x20: /* ILR1 */ 278 case 0x24: /* ILR2 */ 279 case 0x28: /* ILR3 */ 280 case 0x2c: /* ILR4 */ 281 case 0x30: /* ILR5 */ 282 case 0x34: /* ILR6 */ 283 case 0x38: /* ILR7 */ 284 case 0x3c: /* ILR8 */ 285 case 0x40: /* ILR9 */ 286 case 0x44: /* ILR10 */ 287 case 0x48: /* ILR11 */ 288 case 0x4c: /* ILR12 */ 289 case 0x50: /* ILR13 */ 290 case 0x54: /* ILR14 */ 291 case 0x58: /* ILR15 */ 292 case 0x5c: /* ILR16 */ 293 case 0x60: /* ILR17 */ 294 case 0x64: /* ILR18 */ 295 case 0x68: /* ILR19 */ 296 case 0x6c: /* ILR20 */ 297 case 0x70: /* ILR21 */ 298 case 0x74: /* ILR22 */ 299 case 0x78: /* ILR23 */ 300 case 0x7c: /* ILR24 */ 301 case 0x80: /* ILR25 */ 302 case 0x84: /* ILR26 */ 303 case 0x88: /* ILR27 */ 304 case 0x8c: /* ILR28 */ 305 case 0x90: /* ILR29 */ 306 case 0x94: /* ILR30 */ 307 case 0x98: /* ILR31 */ 308 i = (offset - 0x1c) >> 2; 309 bank->priority[i] = (value >> 2) & 0x1f; 310 bank->sens_edge &= ~(1 << i); 311 bank->sens_edge |= ((value >> 1) & 1) << i; 312 bank->fiq &= ~(1 << i); 313 bank->fiq |= (value & 1) << i; 314 return; 315 316 case 0x9c: /* ISR */ 317 for (i = 0; i < 32; i ++) 318 if (value & (1 << i)) { 319 omap_set_intr(s, 32 * bank_no + i, 1); 320 return; 321 } 322 return; 323 } 324 OMAP_BAD_REG(addr); 325 } 326 327 static const MemoryRegionOps omap_inth_mem_ops = { 328 .read = omap_inth_read, 329 .write = omap_inth_write, 330 .endianness = DEVICE_NATIVE_ENDIAN, 331 .valid = { 332 .min_access_size = 4, 333 .max_access_size = 4, 334 }, 335 }; 336 337 static void omap_inth_reset(DeviceState *dev) 338 { 339 OMAPIntcState *s = OMAP_INTC(dev); 340 int i; 341 342 for (i = 0; i < s->nbanks; ++i){ 343 s->bank[i].irqs = 0x00000000; 344 s->bank[i].mask = 0xffffffff; 345 s->bank[i].sens_edge = 0x00000000; 346 s->bank[i].fiq = 0x00000000; 347 s->bank[i].inputs = 0x00000000; 348 s->bank[i].swi = 0x00000000; 349 memset(s->bank[i].priority, 0, sizeof(s->bank[i].priority)); 350 351 if (s->level_only) 352 s->bank[i].sens_edge = 0xffffffff; 353 } 354 355 s->new_agr[0] = ~0; 356 s->new_agr[1] = ~0; 357 s->sir_intr[0] = 0; 358 s->sir_intr[1] = 0; 359 s->autoidle = 0; 360 s->mask = ~0; 361 362 qemu_set_irq(s->parent_intr[0], 0); 363 qemu_set_irq(s->parent_intr[1], 0); 364 } 365 366 static void omap_intc_init(Object *obj) 367 { 368 DeviceState *dev = DEVICE(obj); 369 OMAPIntcState *s = OMAP_INTC(obj); 370 SysBusDevice *sbd = SYS_BUS_DEVICE(obj); 371 372 s->nbanks = 1; 373 sysbus_init_irq(sbd, &s->parent_intr[0]); 374 sysbus_init_irq(sbd, &s->parent_intr[1]); 375 qdev_init_gpio_in(dev, omap_set_intr, s->nbanks * 32); 376 memory_region_init_io(&s->mmio, obj, &omap_inth_mem_ops, s, 377 "omap-intc", s->size); 378 sysbus_init_mmio(sbd, &s->mmio); 379 } 380 381 static void omap_intc_realize(DeviceState *dev, Error **errp) 382 { 383 OMAPIntcState *s = OMAP_INTC(dev); 384 385 if (!s->iclk) { 386 error_setg(errp, "omap-intc: clk not connected"); 387 } 388 } 389 390 void omap_intc_set_iclk(OMAPIntcState *intc, omap_clk clk) 391 { 392 intc->iclk = clk; 393 } 394 395 void omap_intc_set_fclk(OMAPIntcState *intc, omap_clk clk) 396 { 397 intc->fclk = clk; 398 } 399 400 static Property omap_intc_properties[] = { 401 DEFINE_PROP_UINT32("size", OMAPIntcState, size, 0x100), 402 DEFINE_PROP_END_OF_LIST(), 403 }; 404 405 static void omap_intc_class_init(ObjectClass *klass, void *data) 406 { 407 DeviceClass *dc = DEVICE_CLASS(klass); 408 409 dc->reset = omap_inth_reset; 410 device_class_set_props(dc, omap_intc_properties); 411 /* Reason: pointer property "clk" */ 412 dc->user_creatable = false; 413 dc->realize = omap_intc_realize; 414 } 415 416 static const TypeInfo omap_intc_info = { 417 .name = "omap-intc", 418 .parent = TYPE_OMAP_INTC, 419 .instance_init = omap_intc_init, 420 .class_init = omap_intc_class_init, 421 }; 422 423 static uint64_t omap2_inth_read(void *opaque, hwaddr addr, 424 unsigned size) 425 { 426 OMAPIntcState *s = opaque; 427 int offset = addr; 428 int bank_no, line_no; 429 struct omap_intr_handler_bank_s *bank = NULL; 430 431 if ((offset & 0xf80) == 0x80) { 432 bank_no = (offset & 0x60) >> 5; 433 if (bank_no < s->nbanks) { 434 offset &= ~0x60; 435 bank = &s->bank[bank_no]; 436 } else { 437 OMAP_BAD_REG(addr); 438 return 0; 439 } 440 } 441 442 switch (offset) { 443 case 0x00: /* INTC_REVISION */ 444 return s->revision; 445 446 case 0x10: /* INTC_SYSCONFIG */ 447 return (s->autoidle >> 2) & 1; 448 449 case 0x14: /* INTC_SYSSTATUS */ 450 return 1; /* RESETDONE */ 451 452 case 0x40: /* INTC_SIR_IRQ */ 453 return s->sir_intr[0]; 454 455 case 0x44: /* INTC_SIR_FIQ */ 456 return s->sir_intr[1]; 457 458 case 0x48: /* INTC_CONTROL */ 459 return (!s->mask) << 2; /* GLOBALMASK */ 460 461 case 0x4c: /* INTC_PROTECTION */ 462 return 0; 463 464 case 0x50: /* INTC_IDLE */ 465 return s->autoidle & 3; 466 467 /* Per-bank registers */ 468 case 0x80: /* INTC_ITR */ 469 return bank->inputs; 470 471 case 0x84: /* INTC_MIR */ 472 return bank->mask; 473 474 case 0x88: /* INTC_MIR_CLEAR */ 475 case 0x8c: /* INTC_MIR_SET */ 476 return 0; 477 478 case 0x90: /* INTC_ISR_SET */ 479 return bank->swi; 480 481 case 0x94: /* INTC_ISR_CLEAR */ 482 return 0; 483 484 case 0x98: /* INTC_PENDING_IRQ */ 485 return bank->irqs & ~bank->mask & ~bank->fiq; 486 487 case 0x9c: /* INTC_PENDING_FIQ */ 488 return bank->irqs & ~bank->mask & bank->fiq; 489 490 /* Per-line registers */ 491 case 0x100 ... 0x300: /* INTC_ILR */ 492 bank_no = (offset - 0x100) >> 7; 493 if (bank_no > s->nbanks) 494 break; 495 bank = &s->bank[bank_no]; 496 line_no = (offset & 0x7f) >> 2; 497 return (bank->priority[line_no] << 2) | 498 ((bank->fiq >> line_no) & 1); 499 } 500 OMAP_BAD_REG(addr); 501 return 0; 502 } 503 504 static void omap2_inth_write(void *opaque, hwaddr addr, 505 uint64_t value, unsigned size) 506 { 507 OMAPIntcState *s = opaque; 508 int offset = addr; 509 int bank_no, line_no; 510 struct omap_intr_handler_bank_s *bank = NULL; 511 512 if ((offset & 0xf80) == 0x80) { 513 bank_no = (offset & 0x60) >> 5; 514 if (bank_no < s->nbanks) { 515 offset &= ~0x60; 516 bank = &s->bank[bank_no]; 517 } else { 518 OMAP_BAD_REG(addr); 519 return; 520 } 521 } 522 523 switch (offset) { 524 case 0x10: /* INTC_SYSCONFIG */ 525 s->autoidle &= 4; 526 s->autoidle |= (value & 1) << 2; 527 if (value & 2) { /* SOFTRESET */ 528 omap_inth_reset(DEVICE(s)); 529 } 530 return; 531 532 case 0x48: /* INTC_CONTROL */ 533 s->mask = (value & 4) ? 0 : ~0; /* GLOBALMASK */ 534 if (value & 2) { /* NEWFIQAGR */ 535 qemu_set_irq(s->parent_intr[1], 0); 536 s->new_agr[1] = ~0; 537 omap_inth_update(s, 1); 538 } 539 if (value & 1) { /* NEWIRQAGR */ 540 qemu_set_irq(s->parent_intr[0], 0); 541 s->new_agr[0] = ~0; 542 omap_inth_update(s, 0); 543 } 544 return; 545 546 case 0x4c: /* INTC_PROTECTION */ 547 /* TODO: Make a bitmap (or sizeof(char)map) of access privileges 548 * for every register, see Chapter 3 and 4 for privileged mode. */ 549 if (value & 1) 550 fprintf(stderr, "%s: protection mode enable attempt\n", 551 __func__); 552 return; 553 554 case 0x50: /* INTC_IDLE */ 555 s->autoidle &= ~3; 556 s->autoidle |= value & 3; 557 return; 558 559 /* Per-bank registers */ 560 case 0x84: /* INTC_MIR */ 561 bank->mask = value; 562 omap_inth_update(s, 0); 563 omap_inth_update(s, 1); 564 return; 565 566 case 0x88: /* INTC_MIR_CLEAR */ 567 bank->mask &= ~value; 568 omap_inth_update(s, 0); 569 omap_inth_update(s, 1); 570 return; 571 572 case 0x8c: /* INTC_MIR_SET */ 573 bank->mask |= value; 574 return; 575 576 case 0x90: /* INTC_ISR_SET */ 577 bank->irqs |= bank->swi |= value; 578 omap_inth_update(s, 0); 579 omap_inth_update(s, 1); 580 return; 581 582 case 0x94: /* INTC_ISR_CLEAR */ 583 bank->swi &= ~value; 584 bank->irqs = bank->swi & bank->inputs; 585 return; 586 587 /* Per-line registers */ 588 case 0x100 ... 0x300: /* INTC_ILR */ 589 bank_no = (offset - 0x100) >> 7; 590 if (bank_no > s->nbanks) 591 break; 592 bank = &s->bank[bank_no]; 593 line_no = (offset & 0x7f) >> 2; 594 bank->priority[line_no] = (value >> 2) & 0x3f; 595 bank->fiq &= ~(1 << line_no); 596 bank->fiq |= (value & 1) << line_no; 597 return; 598 599 case 0x00: /* INTC_REVISION */ 600 case 0x14: /* INTC_SYSSTATUS */ 601 case 0x40: /* INTC_SIR_IRQ */ 602 case 0x44: /* INTC_SIR_FIQ */ 603 case 0x80: /* INTC_ITR */ 604 case 0x98: /* INTC_PENDING_IRQ */ 605 case 0x9c: /* INTC_PENDING_FIQ */ 606 OMAP_RO_REG(addr); 607 return; 608 } 609 OMAP_BAD_REG(addr); 610 } 611 612 static const MemoryRegionOps omap2_inth_mem_ops = { 613 .read = omap2_inth_read, 614 .write = omap2_inth_write, 615 .endianness = DEVICE_NATIVE_ENDIAN, 616 .valid = { 617 .min_access_size = 4, 618 .max_access_size = 4, 619 }, 620 }; 621 622 static void omap2_intc_init(Object *obj) 623 { 624 DeviceState *dev = DEVICE(obj); 625 OMAPIntcState *s = OMAP_INTC(obj); 626 SysBusDevice *sbd = SYS_BUS_DEVICE(obj); 627 628 s->level_only = 1; 629 s->nbanks = 3; 630 sysbus_init_irq(sbd, &s->parent_intr[0]); 631 sysbus_init_irq(sbd, &s->parent_intr[1]); 632 qdev_init_gpio_in(dev, omap_set_intr_noedge, s->nbanks * 32); 633 memory_region_init_io(&s->mmio, obj, &omap2_inth_mem_ops, s, 634 "omap2-intc", 0x1000); 635 sysbus_init_mmio(sbd, &s->mmio); 636 } 637 638 static void omap2_intc_realize(DeviceState *dev, Error **errp) 639 { 640 OMAPIntcState *s = OMAP_INTC(dev); 641 642 if (!s->iclk) { 643 error_setg(errp, "omap2-intc: iclk not connected"); 644 return; 645 } 646 if (!s->fclk) { 647 error_setg(errp, "omap2-intc: fclk not connected"); 648 return; 649 } 650 } 651 652 static Property omap2_intc_properties[] = { 653 DEFINE_PROP_UINT8("revision", OMAPIntcState, 654 revision, 0x21), 655 DEFINE_PROP_END_OF_LIST(), 656 }; 657 658 static void omap2_intc_class_init(ObjectClass *klass, void *data) 659 { 660 DeviceClass *dc = DEVICE_CLASS(klass); 661 662 dc->reset = omap_inth_reset; 663 device_class_set_props(dc, omap2_intc_properties); 664 /* Reason: pointer property "iclk", "fclk" */ 665 dc->user_creatable = false; 666 dc->realize = omap2_intc_realize; 667 } 668 669 static const TypeInfo omap2_intc_info = { 670 .name = "omap2-intc", 671 .parent = TYPE_OMAP_INTC, 672 .instance_init = omap2_intc_init, 673 .class_init = omap2_intc_class_init, 674 }; 675 676 static const TypeInfo omap_intc_type_info = { 677 .name = TYPE_OMAP_INTC, 678 .parent = TYPE_SYS_BUS_DEVICE, 679 .instance_size = sizeof(OMAPIntcState), 680 .abstract = true, 681 }; 682 683 static void omap_intc_register_types(void) 684 { 685 type_register_static(&omap_intc_type_info); 686 type_register_static(&omap_intc_info); 687 type_register_static(&omap2_intc_info); 688 } 689 690 type_init(omap_intc_register_types) 691