hw/sh_intc.c

   1 /*
   2  * SuperH interrupt controller module
   3  *
   4  * Copyright (c) 2007 Magnus Damm
   5  * Based on sh_timer.c and arm_timer.c by Paul Brook
   6  * Copyright (c) 2005-2006 CodeSourcery.
   7  *
   8  * This code is licensed under the GPL.
   9  */
  10
  11 #include "sh_intc.h"
  12 #include "hw.h"
  13 #include "sh.h"
  14
  15 //#define DEBUG_INTC
  16 //#define DEBUG_INTC_SOURCES
  17
  18 #define INTC_A7(x) ((x) & 0x1fffffff)
  19
  20 void sh_intc_toggle_source(struct intc_source *source,
  21                            int enable_adj, int assert_adj)
  22 {
  23     int enable_changed = 0;
  24     int pending_changed = 0;
  25     int old_pending;
  26
  27     if ((source->enable_count == source->enable_max) && (enable_adj == -1))
  28         enable_changed = -1;
  29
  30     source->enable_count += enable_adj;
  31
  32     if (source->enable_count == source->enable_max)
  33         enable_changed = 1;
  34
  35     source->asserted += assert_adj;
  36
  37     old_pending = source->pending;
  38     source->pending = source->asserted &&
  39       (source->enable_count == source->enable_max);
  40
  41     if (old_pending != source->pending)
  42         pending_changed = 1;
  43
  44     if (pending_changed) {
  45         if (source->pending) {
  46             source->parent->pending++;
  47             if (source->parent->pending == 1)
  48                 cpu_interrupt(first_cpu, CPU_INTERRUPT_HARD);
  49         }
  50         else {
  51             source->parent->pending--;
  52             if (source->parent->pending == 0)
  53                 cpu_reset_interrupt(first_cpu, CPU_INTERRUPT_HARD);
  54         }
  55     }
  56
  57   if (enable_changed || assert_adj || pending_changed) {
  58 #ifdef DEBUG_INTC_SOURCES
  59             printf("sh_intc: (%d/%d/%d/%d) interrupt source 0x%x %s%s%s\n",
  60                    source->parent->pending,
  61                    source->asserted,
  62                    source->enable_count,
  63                    source->enable_max,
  64                    source->vect,
  65                    source->asserted ? "asserted " :
  66                    assert_adj ? "deasserted" : "",
  67                    enable_changed == 1 ? "enabled " :
  68                    enable_changed == -1 ? "disabled " : "",
  69                    source->pending ? "pending" : "");
  70 #endif
  71   }
  72 }
  73
  74 static void sh_intc_set_irq (void *opaque, int n, int level)
  75 {
  76   struct intc_desc *desc = opaque;
  77   struct intc_source *source = &(desc->sources[n]);
  78
  79   if (level && !source->asserted)
  80     sh_intc_toggle_source(source, 0, 1);
  81   else if (!level && source->asserted)
  82     sh_intc_toggle_source(source, 0, -1);
  83 }
  84
  85 int sh_intc_get_pending_vector(struct intc_desc *desc, int imask)
  86 {
  87     unsigned int i;
  88
  89     /* slow: use a linked lists of pending sources instead */
  90     /* wrong: take interrupt priority into account (one list per priority) */
  91
  92     if (imask == 0x0f) {
  93         return -1; /* FIXME, update code to include priority per source */
  94     }
  95
  96     for (i = 0; i < desc->nr_sources; i++) {
  97         struct intc_source *source = desc->sources + i;
  98
  99         if (source->pending) {
 100 #ifdef DEBUG_INTC_SOURCES
 101             printf("sh_intc: (%d) returning interrupt source 0x%x\n",
 102                    desc->pending, source->vect);
 103 #endif
 104             return source->vect;
 105         }
 106     }
 107
 108     abort();
 109 }
 110
 111 #define INTC_MODE_NONE       0
 112 #define INTC_MODE_DUAL_SET   1
 113 #define INTC_MODE_DUAL_CLR   2
 114 #define INTC_MODE_ENABLE_REG 3
 115 #define INTC_MODE_MASK_REG   4
 116 #define INTC_MODE_IS_PRIO    8
 117
 118 static unsigned int sh_intc_mode(unsigned long address,
 119                                  unsigned long set_reg, unsigned long clr_reg)
 120 {
 121     if ((address != INTC_A7(set_reg)) &&
 122         (address != INTC_A7(clr_reg)))
 123         return INTC_MODE_NONE;
 124
 125     if (set_reg && clr_reg) {
 126         if (address == INTC_A7(set_reg))
 127             return INTC_MODE_DUAL_SET;
 128         else
 129             return INTC_MODE_DUAL_CLR;
 130     }
 131
 132     if (set_reg)
 133         return INTC_MODE_ENABLE_REG;
 134     else
 135         return INTC_MODE_MASK_REG;
 136 }
 137
 138 static void sh_intc_locate(struct intc_desc *desc,
 139                            unsigned long address,
 140                            unsigned long **datap,
 141                            intc_enum **enums,
 142                            unsigned int *first,
 143                            unsigned int *width,
 144                            unsigned int *modep)
 145 {
 146     unsigned int i, mode;
 147
 148     /* this is slow but works for now */
 149
 150     if (desc->mask_regs) {
 151         for (i = 0; i < desc->nr_mask_regs; i++) {
 152             struct intc_mask_reg *mr = desc->mask_regs + i;
 153
 154             mode = sh_intc_mode(address, mr->set_reg, mr->clr_reg);
 155             if (mode == INTC_MODE_NONE)
 156                 continue;
 157
 158             *modep = mode;
 159             *datap = &mr->value;
 160             *enums = mr->enum_ids;
 161             *first = mr->reg_width - 1;
 162             *width = 1;
 163             return;
 164         }
 165     }
 166
 167     if (desc->prio_regs) {
 168         for (i = 0; i < desc->nr_prio_regs; i++) {
 169             struct intc_prio_reg *pr = desc->prio_regs + i;
 170
 171             mode = sh_intc_mode(address, pr->set_reg, pr->clr_reg);
 172             if (mode == INTC_MODE_NONE)
 173                 continue;
 174
 175             *modep = mode | INTC_MODE_IS_PRIO;
 176             *datap = &pr->value;
 177             *enums = pr->enum_ids;
 178             *first = (pr->reg_width / pr->field_width) - 1;
 179             *width = pr->field_width;
 180             return;
 181         }
 182     }
 183
 184     abort();
 185 }
 186
 187 static void sh_intc_toggle_mask(struct intc_desc *desc, intc_enum id,
 188                                 int enable, int is_group)
 189 {
 190     struct intc_source *source = desc->sources + id;
 191
 192     if (!id)
 193         return;
 194
 195     if (!source->next_enum_id && (!source->enable_max || !source->vect)) {
 196 #ifdef DEBUG_INTC_SOURCES
 197         printf("sh_intc: reserved interrupt source %d modified\n", id);
 198 #endif
 199         return;
 200     }
 201
 202     if (source->vect)
 203         sh_intc_toggle_source(source, enable ? 1 : -1, 0);
 204
 205 #ifdef DEBUG_INTC
 206     else {
 207         printf("setting interrupt group %d to %d\n", id, !!enable);
 208     }
 209 #endif
 210
 211     if ((is_group || !source->vect) && source->next_enum_id) {
 212         sh_intc_toggle_mask(desc, source->next_enum_id, enable, 1);
 213     }
 214
 215 #ifdef DEBUG_INTC
 216     if (!source->vect) {
 217         printf("setting interrupt group %d to %d - done\n", id, !!enable);
 218     }
 219 #endif
 220 }
 221
 222 static uint64_t sh_intc_read(void *opaque, hwaddr offset,
 223                              unsigned size)
 224 {
 225     struct intc_desc *desc = opaque;
 226     intc_enum *enum_ids = NULL;
 227     unsigned int first = 0;
 228     unsigned int width = 0;
 229     unsigned int mode = 0;
 230     unsigned long *valuep;
 231
 232 #ifdef DEBUG_INTC
 233     printf("sh_intc_read 0x%lx\n", (unsigned long) offset);
 234 #endif
 235
 236     sh_intc_locate(desc, (unsigned long)offset, &valuep,
 237                    &enum_ids, &first, &width, &mode);
 238     return *valuep;
 239 }
 240
 241 static void sh_intc_write(void *opaque, hwaddr offset,
 242                           uint64_t value, unsigned size)
 243 {
 244     struct intc_desc *desc = opaque;
 245     intc_enum *enum_ids = NULL;
 246     unsigned int first = 0;
 247     unsigned int width = 0;
 248     unsigned int mode = 0;
 249     unsigned int k;
 250     unsigned long *valuep;
 251     unsigned long mask;
 252
 253 #ifdef DEBUG_INTC
 254     printf("sh_intc_write 0x%lx 0x%08x\n", (unsigned long) offset, value);
 255 #endif
 256
 257     sh_intc_locate(desc, (unsigned long)offset, &valuep,
 258                    &enum_ids, &first, &width, &mode);
 259
 260     switch (mode) {
 261     case INTC_MODE_ENABLE_REG | INTC_MODE_IS_PRIO: break;
 262     case INTC_MODE_DUAL_SET: value |= *valuep; break;
 263     case INTC_MODE_DUAL_CLR: value = *valuep & ~value; break;
 264     default: abort();
 265     }
 266
 267     for (k = 0; k <= first; k++) {
 268         mask = ((1 << width) - 1) << ((first - k) * width);
 269
 270         if ((*valuep & mask) == (value & mask))
 271             continue;
 272 #if 0
 273         printf("k = %d, first = %d, enum = %d, mask = 0x%08x\n",
 274                k, first, enum_ids[k], (unsigned int)mask);
 275 #endif
 276         sh_intc_toggle_mask(desc, enum_ids[k], value & mask, 0);
 277     }
 278
 279     *valuep = value;
 280
 281 #ifdef DEBUG_INTC
 282     printf("sh_intc_write 0x%lx -> 0x%08x\n", (unsigned long) offset, value);
 283 #endif
 284 }
 285
 286 static const MemoryRegionOps sh_intc_ops = {
 287     .read = sh_intc_read,
 288     .write = sh_intc_write,
 289     .endianness = DEVICE_NATIVE_ENDIAN,
 290 };
 291
 292 struct intc_source *sh_intc_source(struct intc_desc *desc, intc_enum id)
 293 {
 294     if (id)
 295         return desc->sources + id;
 296
 297     return NULL;
 298 }
 299
 300 static unsigned int sh_intc_register(MemoryRegion *sysmem,
 301                              struct intc_desc *desc,
 302                              const unsigned long address,
 303                              const char *type,
 304                              const char *action,
 305                              const unsigned int index)
 306 {
 307     char name[60];
 308     MemoryRegion *iomem, *iomem_p4, *iomem_a7;
 309
 310     if (!address) {
 311         return 0;
 312     }
 313
 314     iomem = &desc->iomem;
 315     iomem_p4 = desc->iomem_aliases + index;
 316     iomem_a7 = iomem_p4 + 1;
 317
 318 #define SH_INTC_IOMEM_FORMAT "interrupt-controller-%s-%s-%s"
 319     snprintf(name, sizeof(name), SH_INTC_IOMEM_FORMAT, type, action, "p4");
 320     memory_region_init_alias(iomem_p4, name, iomem, INTC_A7(address), 4);
 321     memory_region_add_subregion(sysmem, P4ADDR(address), iomem_p4);
 322
 323     snprintf(name, sizeof(name), SH_INTC_IOMEM_FORMAT, type, action, "a7");
 324     memory_region_init_alias(iomem_a7, name, iomem, INTC_A7(address), 4);
 325     memory_region_add_subregion(sysmem, A7ADDR(address), iomem_a7);
 326 #undef SH_INTC_IOMEM_FORMAT
 327
 328     /* used to increment aliases index */
 329     return 2;
 330 }
 331
 332 static void sh_intc_register_source(struct intc_desc *desc,
 333                                     intc_enum source,
 334                                     struct intc_group *groups,
 335                                     int nr_groups)
 336 {
 337     unsigned int i, k;
 338     struct intc_source *s;
 339
 340     if (desc->mask_regs) {
 341         for (i = 0; i < desc->nr_mask_regs; i++) {
 342             struct intc_mask_reg *mr = desc->mask_regs + i;
 343
 344             for (k = 0; k < ARRAY_SIZE(mr->enum_ids); k++) {
 345                 if (mr->enum_ids[k] != source)
 346                     continue;
 347
 348                 s = sh_intc_source(desc, mr->enum_ids[k]);
 349                 if (s)
 350                     s->enable_max++;
 351             }
 352         }
 353     }
 354
 355     if (desc->prio_regs) {
 356         for (i = 0; i < desc->nr_prio_regs; i++) {
 357             struct intc_prio_reg *pr = desc->prio_regs + i;
 358
 359             for (k = 0; k < ARRAY_SIZE(pr->enum_ids); k++) {
 360                 if (pr->enum_ids[k] != source)
 361                     continue;
 362
 363                 s = sh_intc_source(desc, pr->enum_ids[k]);
 364                 if (s)
 365                     s->enable_max++;
 366             }
 367         }
 368     }
 369
 370     if (groups) {
 371         for (i = 0; i < nr_groups; i++) {
 372             struct intc_group *gr = groups + i;
 373
 374             for (k = 0; k < ARRAY_SIZE(gr->enum_ids); k++) {
 375                 if (gr->enum_ids[k] != source)
 376                     continue;
 377
 378                 s = sh_intc_source(desc, gr->enum_ids[k]);
 379                 if (s)
 380                     s->enable_max++;
 381             }
 382         }
 383     }
 384
 385 }
 386
 387 void sh_intc_register_sources(struct intc_desc *desc,
 388                               struct intc_vect *vectors,
 389                               int nr_vectors,
 390                               struct intc_group *groups,
 391                               int nr_groups)
 392 {
 393     unsigned int i, k;
 394     struct intc_source *s;
 395
 396     for (i = 0; i < nr_vectors; i++) {
 397         struct intc_vect *vect = vectors + i;
 398
 399         sh_intc_register_source(desc, vect->enum_id, groups, nr_groups);
 400         s = sh_intc_source(desc, vect->enum_id);
 401         if (s) {
 402             s->vect = vect->vect;
 403
 404 #ifdef DEBUG_INTC_SOURCES
 405             printf("sh_intc: registered source %d -> 0x%04x (%d/%d)\n",
 406                    vect->enum_id, s->vect, s->enable_count, s->enable_max);
 407 #endif
 408         }
 409     }
 410
 411     if (groups) {
 412         for (i = 0; i < nr_groups; i++) {
 413             struct intc_group *gr = groups + i;
 414
 415             s = sh_intc_source(desc, gr->enum_id);
 416             s->next_enum_id = gr->enum_ids[0];
 417
 418             for (k = 1; k < ARRAY_SIZE(gr->enum_ids); k++) {
 419                 if (!gr->enum_ids[k])
 420                     continue;
 421
 422                 s = sh_intc_source(desc, gr->enum_ids[k - 1]);
 423                 s->next_enum_id = gr->enum_ids[k];
 424             }
 425
 426 #ifdef DEBUG_INTC_SOURCES
 427             printf("sh_intc: registered group %d (%d/%d)\n",
 428                    gr->enum_id, s->enable_count, s->enable_max);
 429 #endif
 430         }
 431     }
 432 }
 433
 434 int sh_intc_init(MemoryRegion *sysmem,
 435          struct intc_desc *desc,
 436                  int nr_sources,
 437                  struct intc_mask_reg *mask_regs,
 438                  int nr_mask_regs,
 439                  struct intc_prio_reg *prio_regs,
 440                  int nr_prio_regs)
 441 {
 442     unsigned int i, j;
 443
 444     desc->pending = 0;
 445     desc->nr_sources = nr_sources;
 446     desc->mask_regs = mask_regs;
 447     desc->nr_mask_regs = nr_mask_regs;
 448     desc->prio_regs = prio_regs;
 449     desc->nr_prio_regs = nr_prio_regs;
 450     /* Allocate 4 MemoryRegions per register (2 actions * 2 aliases).
 451      **/
 452     desc->iomem_aliases = g_new0(MemoryRegion,
 453                                  (nr_mask_regs + nr_prio_regs) * 4);
 454
 455     j = 0;
 456     i = sizeof(struct intc_source) * nr_sources;
 457     desc->sources = g_malloc0(i);
 458
 459     for (i = 0; i < desc->nr_sources; i++) {
 460         struct intc_source *source = desc->sources + i;
 461
 462         source->parent = desc;
 463     }
 464
 465     desc->irqs = qemu_allocate_irqs(sh_intc_set_irq, desc, nr_sources);
 466
 467     memory_region_init_io(&desc->iomem, &sh_intc_ops, desc,
 468                           "interrupt-controller", 0x100000000ULL);
 469
 470 #define INT_REG_PARAMS(reg_struct, type, action, j) \
 471         reg_struct->action##_reg, #type, #action, j
 472     if (desc->mask_regs) {
 473         for (i = 0; i < desc->nr_mask_regs; i++) {
 474             struct intc_mask_reg *mr = desc->mask_regs + i;
 475
 476             j += sh_intc_register(sysmem, desc,
 477                                   INT_REG_PARAMS(mr, mask, set, j));
 478             j += sh_intc_register(sysmem, desc,
 479                                   INT_REG_PARAMS(mr, mask, clr, j));
 480         }
 481     }
 482
 483     if (desc->prio_regs) {
 484         for (i = 0; i < desc->nr_prio_regs; i++) {
 485             struct intc_prio_reg *pr = desc->prio_regs + i;
 486
 487             j += sh_intc_register(sysmem, desc,
 488                                   INT_REG_PARAMS(pr, prio, set, j));
 489             j += sh_intc_register(sysmem, desc,
 490                                   INT_REG_PARAMS(pr, prio, clr, j));
 491         }
 492     }
 493 #undef INT_REG_PARAMS
 494
 495     return 0;
 496 }
 497
 498 /* Assert level <n> IRL interrupt.
 499    0:deassert. 1:lowest priority,... 15:highest priority. */
 500 void sh_intc_set_irl(void *opaque, int n, int level)
 501 {
 502     struct intc_source *s = opaque;
 503     int i, irl = level ^ 15;
 504     for (i = 0; (s = sh_intc_source(s->parent, s->next_enum_id)); i++) {
 505         if (i == irl)
 506             sh_intc_toggle_source(s, s->enable_count?0:1, s->asserted?0:1);
 507         else
 508             if (s->asserted)
 509                 sh_intc_toggle_source(s, 0, -1);
 510     }
 511 }