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 licenced under the GPL.
   9  */
  10
  11 #include <assert.h>
  12 #include "sh_intc.h"
  13 #include "hw.h"
  14 #include "sh.h"
  15
  16 //#define DEBUG_INTC
  17 //#define DEBUG_INTC_SOURCES
  18
  19 #define INTC_A7(x) ((x) & 0x1fffffff)
  20
  21 void sh_intc_toggle_source(struct intc_source *source,
  22                            int enable_adj, int assert_adj)
  23 {
  24     int enable_changed = 0;
  25     int pending_changed = 0;
  26     int old_pending;
  27
  28     if ((source->enable_count == source->enable_max) && (enable_adj == -1))
  29         enable_changed = -1;
  30
  31     source->enable_count += enable_adj;
  32
  33     if (source->enable_count == source->enable_max)
  34         enable_changed = 1;
  35
  36     source->asserted += assert_adj;
  37
  38     old_pending = source->pending;
  39     source->pending = source->asserted &&
  40       (source->enable_count == source->enable_max);
  41
  42     if (old_pending != source->pending)
  43         pending_changed = 1;
  44
  45     if (pending_changed) {
  46         if (source->pending) {
  47             source->parent->pending++;
  48             if (source->parent->pending == 1)
  49                 cpu_interrupt(first_cpu, CPU_INTERRUPT_HARD);
  50         }
  51         else {
  52             source->parent->pending--;
  53             if (source->parent->pending == 0)
  54                 cpu_reset_interrupt(first_cpu, CPU_INTERRUPT_HARD);
  55         }
  56     }
  57
  58   if (enable_changed || assert_adj || pending_changed) {
  59 #ifdef DEBUG_INTC_SOURCES
  60             printf("sh_intc: (%d/%d/%d/%d) interrupt source 0x%x %s%s%s\n",
  61                    source->parent->pending,
  62                    source->asserted,
  63                    source->enable_count,
  64                    source->enable_max,
  65                    source->vect,
  66                    source->asserted ? "asserted " :
  67                    assert_adj ? "deasserted" : "",
  68                    enable_changed == 1 ? "enabled " :
  69                    enable_changed == -1 ? "disabled " : "",
  70                    source->pending ? "pending" : "");
  71 #endif
  72   }
  73 }
  74
  75 static void sh_intc_set_irq (void *opaque, int n, int level)
  76 {
  77   struct intc_desc *desc = opaque;
  78   struct intc_source *source = &(desc->sources[n]);
  79
  80   if (level && !source->asserted)
  81     sh_intc_toggle_source(source, 0, 1);
  82   else if (!level && source->asserted)
  83     sh_intc_toggle_source(source, 0, -1);
  84 }
  85
  86 int sh_intc_get_pending_vector(struct intc_desc *desc, int imask)
  87 {
  88     unsigned int i;
  89
  90     /* slow: use a linked lists of pending sources instead */
  91     /* wrong: take interrupt priority into account (one list per priority) */
  92
  93     if (imask == 0x0f) {
  94         return -1; /* FIXME, update code to include priority per source */
  95     }
  96
  97     for (i = 0; i < desc->nr_sources; i++) {
  98         struct intc_source *source = desc->sources + i;
  99
 100         if (source->pending) {
 101 #ifdef DEBUG_INTC_SOURCES
 102             printf("sh_intc: (%d) returning interrupt source 0x%x\n",
 103                    desc->pending, source->vect);
 104 #endif
 105             return source->vect;
 106         }
 107     }
 108
 109     assert(0);
 110 }
 111
 112 #define INTC_MODE_NONE       0
 113 #define INTC_MODE_DUAL_SET   1
 114 #define INTC_MODE_DUAL_CLR   2
 115 #define INTC_MODE_ENABLE_REG 3
 116 #define INTC_MODE_MASK_REG   4
 117 #define INTC_MODE_IS_PRIO    8
 118
 119 static unsigned int sh_intc_mode(unsigned long address,
 120                                  unsigned long set_reg, unsigned long clr_reg)
 121 {
 122     if ((address != INTC_A7(set_reg)) &&
 123         (address != INTC_A7(clr_reg)))
 124         return INTC_MODE_NONE;
 125
 126     if (set_reg && clr_reg) {
 127         if (address == INTC_A7(set_reg))
 128             return INTC_MODE_DUAL_SET;
 129         else
 130             return INTC_MODE_DUAL_CLR;
 131     }
 132
 133     if (set_reg)
 134         return INTC_MODE_ENABLE_REG;
 135     else
 136         return INTC_MODE_MASK_REG;
 137 }
 138
 139 static void sh_intc_locate(struct intc_desc *desc,
 140                            unsigned long address,
 141                            unsigned long **datap,
 142                            intc_enum **enums,
 143                            unsigned int *first,
 144                            unsigned int *width,
 145                            unsigned int *modep)
 146 {
 147     unsigned int i, mode;
 148
 149     /* this is slow but works for now */
 150
 151     if (desc->mask_regs) {
 152         for (i = 0; i < desc->nr_mask_regs; i++) {
 153             struct intc_mask_reg *mr = desc->mask_regs + i;
 154
 155             mode = sh_intc_mode(address, mr->set_reg, mr->clr_reg);
 156             if (mode == INTC_MODE_NONE)
 157                 continue;
 158
 159             *modep = mode;
 160             *datap = &mr->value;
 161             *enums = mr->enum_ids;
 162             *first = mr->reg_width - 1;
 163             *width = 1;
 164             return;
 165         }
 166     }
 167
 168     if (desc->prio_regs) {
 169         for (i = 0; i < desc->nr_prio_regs; i++) {
 170             struct intc_prio_reg *pr = desc->prio_regs + i;
 171
 172             mode = sh_intc_mode(address, pr->set_reg, pr->clr_reg);
 173             if (mode == INTC_MODE_NONE)
 174                 continue;
 175
 176             *modep = mode | INTC_MODE_IS_PRIO;
 177             *datap = &pr->value;
 178             *enums = pr->enum_ids;
 179             *first = (pr->reg_width / pr->field_width) - 1;
 180             *width = pr->field_width;
 181             return;
 182         }
 183     }
 184
 185     assert(0);
 186 }
 187
 188 static void sh_intc_toggle_mask(struct intc_desc *desc, intc_enum id,
 189                                 int enable, int is_group)
 190 {
 191     struct intc_source *source = desc->sources + id;
 192
 193     if (!id)
 194         return;
 195
 196     if (!source->next_enum_id && (!source->enable_max || !source->vect)) {
 197 #ifdef DEBUG_INTC_SOURCES
 198         printf("sh_intc: reserved interrupt source %d modified\n", id);
 199 #endif
 200         return;
 201     }
 202
 203     if (source->vect)
 204         sh_intc_toggle_source(source, enable ? 1 : -1, 0);
 205
 206 #ifdef DEBUG_INTC
 207     else {
 208         printf("setting interrupt group %d to %d\n", id, !!enable);
 209     }
 210 #endif
 211
 212     if ((is_group || !source->vect) && source->next_enum_id) {
 213         sh_intc_toggle_mask(desc, source->next_enum_id, enable, 1);
 214     }
 215
 216 #ifdef DEBUG_INTC
 217     if (!source->vect) {
 218         printf("setting interrupt group %d to %d - done\n", id, !!enable);
 219     }
 220 #endif
 221 }
 222
 223 static uint32_t sh_intc_read(void *opaque, target_phys_addr_t offset)
 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, target_phys_addr_t offset,
 242                           uint32_t value)
 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: assert(0);
 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 CPUReadMemoryFunc *sh_intc_readfn[] = {
 287     sh_intc_read,
 288     sh_intc_read,
 289     sh_intc_read
 290 };
 291
 292 static CPUWriteMemoryFunc *sh_intc_writefn[] = {
 293     sh_intc_write,
 294     sh_intc_write,
 295     sh_intc_write
 296 };
 297
 298 struct intc_source *sh_intc_source(struct intc_desc *desc, intc_enum id)
 299 {
 300     if (id)
 301         return desc->sources + id;
 302
 303     return NULL;
 304 }
 305
 306 static void sh_intc_register(struct intc_desc *desc,
 307                              unsigned long address)
 308 {
 309     if (address) {
 310         cpu_register_physical_memory_offset(P4ADDR(address), 4,
 311                                             desc->iomemtype, INTC_A7(address));
 312         cpu_register_physical_memory_offset(A7ADDR(address), 4,
 313                                             desc->iomemtype, INTC_A7(address));
 314     }
 315 }
 316
 317 static void sh_intc_register_source(struct intc_desc *desc,
 318                                     intc_enum source,
 319                                     struct intc_group *groups,
 320                                     int nr_groups)
 321 {
 322     unsigned int i, k;
 323     struct intc_source *s;
 324
 325     if (desc->mask_regs) {
 326         for (i = 0; i < desc->nr_mask_regs; i++) {
 327             struct intc_mask_reg *mr = desc->mask_regs + i;
 328
 329             for (k = 0; k < ARRAY_SIZE(mr->enum_ids); k++) {
 330                 if (mr->enum_ids[k] != source)
 331                     continue;
 332
 333                 s = sh_intc_source(desc, mr->enum_ids[k]);
 334                 if (s)
 335                     s->enable_max++;
 336             }
 337         }
 338     }
 339
 340     if (desc->prio_regs) {
 341         for (i = 0; i < desc->nr_prio_regs; i++) {
 342             struct intc_prio_reg *pr = desc->prio_regs + i;
 343
 344             for (k = 0; k < ARRAY_SIZE(pr->enum_ids); k++) {
 345                 if (pr->enum_ids[k] != source)
 346                     continue;
 347
 348                 s = sh_intc_source(desc, pr->enum_ids[k]);
 349                 if (s)
 350                     s->enable_max++;
 351             }
 352         }
 353     }
 354
 355     if (groups) {
 356         for (i = 0; i < nr_groups; i++) {
 357             struct intc_group *gr = groups + i;
 358
 359             for (k = 0; k < ARRAY_SIZE(gr->enum_ids); k++) {
 360                 if (gr->enum_ids[k] != source)
 361                     continue;
 362
 363                 s = sh_intc_source(desc, gr->enum_ids[k]);
 364                 if (s)
 365                     s->enable_max++;
 366             }
 367         }
 368     }
 369
 370 }
 371
 372 void sh_intc_register_sources(struct intc_desc *desc,
 373                               struct intc_vect *vectors,
 374                               int nr_vectors,
 375                               struct intc_group *groups,
 376                               int nr_groups)
 377 {
 378     unsigned int i, k;
 379     struct intc_source *s;
 380
 381     for (i = 0; i < nr_vectors; i++) {
 382         struct intc_vect *vect = vectors + i;
 383
 384         sh_intc_register_source(desc, vect->enum_id, groups, nr_groups);
 385         s = sh_intc_source(desc, vect->enum_id);
 386         if (s)
 387             s->vect = vect->vect;
 388
 389 #ifdef DEBUG_INTC_SOURCES
 390         printf("sh_intc: registered source %d -> 0x%04x (%d/%d)\n",
 391                vect->enum_id, s->vect, s->enable_count, s->enable_max);
 392 #endif
 393     }
 394
 395     if (groups) {
 396         for (i = 0; i < nr_groups; i++) {
 397             struct intc_group *gr = groups + i;
 398
 399             s = sh_intc_source(desc, gr->enum_id);
 400             s->next_enum_id = gr->enum_ids[0];
 401
 402             for (k = 1; k < ARRAY_SIZE(gr->enum_ids); k++) {
 403                 if (!gr->enum_ids[k])
 404                     continue;
 405
 406                 s = sh_intc_source(desc, gr->enum_ids[k - 1]);
 407                 s->next_enum_id = gr->enum_ids[k];
 408             }
 409
 410 #ifdef DEBUG_INTC_SOURCES
 411             printf("sh_intc: registered group %d (%d/%d)\n",
 412                    gr->enum_id, s->enable_count, s->enable_max);
 413 #endif
 414         }
 415     }
 416 }
 417
 418 int sh_intc_init(struct intc_desc *desc,
 419                  int nr_sources,
 420                  struct intc_mask_reg *mask_regs,
 421                  int nr_mask_regs,
 422                  struct intc_prio_reg *prio_regs,
 423                  int nr_prio_regs)
 424 {
 425     unsigned int i;
 426
 427     desc->pending = 0;
 428     desc->nr_sources = nr_sources;
 429     desc->mask_regs = mask_regs;
 430     desc->nr_mask_regs = nr_mask_regs;
 431     desc->prio_regs = prio_regs;
 432     desc->nr_prio_regs = nr_prio_regs;
 433
 434     i = sizeof(struct intc_source) * nr_sources;
 435     desc->sources = malloc(i);
 436     if (!desc->sources)
 437         return -1;
 438
 439     memset(desc->sources, 0, i);
 440     for (i = 0; i < desc->nr_sources; i++) {
 441         struct intc_source *source = desc->sources + i;
 442
 443         source->parent = desc;
 444     }
 445
 446     desc->irqs = qemu_allocate_irqs(sh_intc_set_irq, desc, nr_sources);
 447
 448     desc->iomemtype = cpu_register_io_memory(0, sh_intc_readfn,
 449                                              sh_intc_writefn, desc);
 450     if (desc->mask_regs) {
 451         for (i = 0; i < desc->nr_mask_regs; i++) {
 452             struct intc_mask_reg *mr = desc->mask_regs + i;
 453
 454             sh_intc_register(desc, mr->set_reg);
 455             sh_intc_register(desc, mr->clr_reg);
 456         }
 457     }
 458
 459     if (desc->prio_regs) {
 460         for (i = 0; i < desc->nr_prio_regs; i++) {
 461             struct intc_prio_reg *pr = desc->prio_regs + i;
 462
 463             sh_intc_register(desc, pr->set_reg);
 464             sh_intc_register(desc, pr->clr_reg);
 465         }
 466     }
 467
 468     return 0;
 469 }
 470
 471 /* Assert level <n> IRL interrupt.
 472    0:deassert. 1:lowest priority,... 15:highest priority. */
 473 void sh_intc_set_irl(void *opaque, int n, int level)
 474 {
 475     struct intc_source *s = opaque;
 476     int i, irl = level ^ 15;
 477     for (i = 0; (s = sh_intc_source(s->parent, s->next_enum_id)); i++) {
 478         if (i == irl)
 479             sh_intc_toggle_source(s, s->enable_count?0:1, s->asserted?0:1);
 480         else
 481             if (s->asserted)
 482                 sh_intc_toggle_source(s, 0, -1);
 483     }
 484 }