hw/ppc4xx_devs.c

   1 /*
   2  * QEMU PowerPC 4xx embedded processors shared devices emulation
   3  *
   4  * Copyright (c) 2007 Jocelyn Mayer
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "hw.h"
  25 #include "ppc.h"
  26 #include "ppc4xx.h"
  27 #include "sysemu.h"
  28 #include "qemu-log.h"
  29
  30 //#define DEBUG_MMIO
  31 //#define DEBUG_UNASSIGNED
  32 #define DEBUG_UIC
  33
  34 /*****************************************************************************/
  35 /* Generic PowerPC 4xx processor instanciation */
  36 CPUState *ppc4xx_init (const char *cpu_model,
  37                        clk_setup_t *cpu_clk, clk_setup_t *tb_clk,
  38                        uint32_t sysclk)
  39 {
  40     CPUState *env;
  41
  42     /* init CPUs */
  43     env = cpu_init(cpu_model);
  44     if (!env) {
  45         fprintf(stderr, "Unable to find PowerPC %s CPU definition\n",
  46                 cpu_model);
  47         exit(1);
  48     }
  49     cpu_clk->cb = NULL; /* We don't care about CPU clock frequency changes */
  50     cpu_clk->opaque = env;
  51     /* Set time-base frequency to sysclk */
  52     tb_clk->cb = ppc_emb_timers_init(env, sysclk);
  53     tb_clk->opaque = env;
  54     ppc_dcr_init(env, NULL, NULL);
  55     /* Register qemu callbacks */
  56     qemu_register_reset(&cpu_ppc_reset, env);
  57
  58     return env;
  59 }
  60
  61 /*****************************************************************************/
  62 /* Fake device used to map multiple devices in a single memory page */
  63 #define MMIO_AREA_BITS 8
  64 #define MMIO_AREA_LEN (1 << MMIO_AREA_BITS)
  65 #define MMIO_AREA_NB (1 << (TARGET_PAGE_BITS - MMIO_AREA_BITS))
  66 #define MMIO_IDX(addr) (((addr) >> MMIO_AREA_BITS) & (MMIO_AREA_NB - 1))
  67 struct ppc4xx_mmio_t {
  68     target_phys_addr_t base;
  69     CPUReadMemoryFunc **mem_read[MMIO_AREA_NB];
  70     CPUWriteMemoryFunc **mem_write[MMIO_AREA_NB];
  71     void *opaque[MMIO_AREA_NB];
  72 };
  73
  74 static uint32_t unassigned_mmio_readb (void *opaque, target_phys_addr_t addr)
  75 {
  76 #ifdef DEBUG_UNASSIGNED
  77     ppc4xx_mmio_t *mmio;
  78
  79     mmio = opaque;
  80     printf("Unassigned mmio read 0x" PADDRX " base " PADDRX "\n",
  81            addr, mmio->base);
  82 #endif
  83
  84     return 0;
  85 }
  86
  87 static void unassigned_mmio_writeb (void *opaque,
  88                                     target_phys_addr_t addr, uint32_t val)
  89 {
  90 #ifdef DEBUG_UNASSIGNED
  91     ppc4xx_mmio_t *mmio;
  92
  93     mmio = opaque;
  94     printf("Unassigned mmio write 0x" PADDRX " = 0x%x base " PADDRX "\n",
  95            addr, val, mmio->base);
  96 #endif
  97 }
  98
  99 static CPUReadMemoryFunc *unassigned_mmio_read[3] = {
 100     unassigned_mmio_readb,
 101     unassigned_mmio_readb,
 102     unassigned_mmio_readb,
 103 };
 104
 105 static CPUWriteMemoryFunc *unassigned_mmio_write[3] = {
 106     unassigned_mmio_writeb,
 107     unassigned_mmio_writeb,
 108     unassigned_mmio_writeb,
 109 };
 110
 111 static uint32_t mmio_readlen (ppc4xx_mmio_t *mmio,
 112                               target_phys_addr_t addr, int len)
 113 {
 114     CPUReadMemoryFunc **mem_read;
 115     uint32_t ret;
 116     int idx;
 117
 118     idx = MMIO_IDX(addr);
 119 #if defined(DEBUG_MMIO)
 120     printf("%s: mmio %p len %d addr " PADDRX " idx %d\n", __func__,
 121            mmio, len, addr, idx);
 122 #endif
 123     mem_read = mmio->mem_read[idx];
 124     ret = (*mem_read[len])(mmio->opaque[idx], addr);
 125
 126     return ret;
 127 }
 128
 129 static void mmio_writelen (ppc4xx_mmio_t *mmio,
 130                            target_phys_addr_t addr, uint32_t value, int len)
 131 {
 132     CPUWriteMemoryFunc **mem_write;
 133     int idx;
 134
 135     idx = MMIO_IDX(addr);
 136 #if defined(DEBUG_MMIO)
 137     printf("%s: mmio %p len %d addr " PADDRX " idx %d value %08" PRIx32 "\n",
 138            __func__, mmio, len, addr, idx, value);
 139 #endif
 140     mem_write = mmio->mem_write[idx];
 141     (*mem_write[len])(mmio->opaque[idx], addr, value);
 142 }
 143
 144 static uint32_t mmio_readb (void *opaque, target_phys_addr_t addr)
 145 {
 146 #if defined(DEBUG_MMIO)
 147     printf("%s: addr " PADDRX "\n", __func__, addr);
 148 #endif
 149
 150     return mmio_readlen(opaque, addr, 0);
 151 }
 152
 153 static void mmio_writeb (void *opaque,
 154                          target_phys_addr_t addr, uint32_t value)
 155 {
 156 #if defined(DEBUG_MMIO)
 157     printf("%s: addr " PADDRX " val %08" PRIx32 "\n", __func__, addr, value);
 158 #endif
 159     mmio_writelen(opaque, addr, value, 0);
 160 }
 161
 162 static uint32_t mmio_readw (void *opaque, target_phys_addr_t addr)
 163 {
 164 #if defined(DEBUG_MMIO)
 165     printf("%s: addr " PADDRX "\n", __func__, addr);
 166 #endif
 167
 168     return mmio_readlen(opaque, addr, 1);
 169 }
 170
 171 static void mmio_writew (void *opaque,
 172                          target_phys_addr_t addr, uint32_t value)
 173 {
 174 #if defined(DEBUG_MMIO)
 175     printf("%s: addr " PADDRX " val %08" PRIx32 "\n", __func__, addr, value);
 176 #endif
 177     mmio_writelen(opaque, addr, value, 1);
 178 }
 179
 180 static uint32_t mmio_readl (void *opaque, target_phys_addr_t addr)
 181 {
 182 #if defined(DEBUG_MMIO)
 183     printf("%s: addr " PADDRX "\n", __func__, addr);
 184 #endif
 185
 186     return mmio_readlen(opaque, addr, 2);
 187 }
 188
 189 static void mmio_writel (void *opaque,
 190                          target_phys_addr_t addr, uint32_t value)
 191 {
 192 #if defined(DEBUG_MMIO)
 193     printf("%s: addr " PADDRX " val %08" PRIx32 "\n", __func__, addr, value);
 194 #endif
 195     mmio_writelen(opaque, addr, value, 2);
 196 }
 197
 198 static CPUReadMemoryFunc *mmio_read[] = {
 199     &mmio_readb,
 200     &mmio_readw,
 201     &mmio_readl,
 202 };
 203
 204 static CPUWriteMemoryFunc *mmio_write[] = {
 205     &mmio_writeb,
 206     &mmio_writew,
 207     &mmio_writel,
 208 };
 209
 210 int ppc4xx_mmio_register (CPUState *env, ppc4xx_mmio_t *mmio,
 211                           target_phys_addr_t offset, uint32_t len,
 212                           CPUReadMemoryFunc **mem_read,
 213                           CPUWriteMemoryFunc **mem_write, void *opaque)
 214 {
 215     target_phys_addr_t end;
 216     int idx, eidx;
 217
 218     if ((offset + len) > TARGET_PAGE_SIZE)
 219         return -1;
 220     idx = MMIO_IDX(offset);
 221     end = offset + len - 1;
 222     eidx = MMIO_IDX(end);
 223 #if defined(DEBUG_MMIO)
 224     printf("%s: offset " PADDRX " len %08" PRIx32 " " PADDRX " %d %d\n",
 225            __func__, offset, len, end, idx, eidx);
 226 #endif
 227     for (; idx <= eidx; idx++) {
 228         mmio->mem_read[idx] = mem_read;
 229         mmio->mem_write[idx] = mem_write;
 230         mmio->opaque[idx] = opaque;
 231     }
 232
 233     return 0;
 234 }
 235
 236 ppc4xx_mmio_t *ppc4xx_mmio_init (CPUState *env, target_phys_addr_t base)
 237 {
 238     ppc4xx_mmio_t *mmio;
 239     int mmio_memory;
 240
 241     mmio = qemu_mallocz(sizeof(ppc4xx_mmio_t));
 242     if (mmio != NULL) {
 243         mmio->base = base;
 244         mmio_memory = cpu_register_io_memory(0, mmio_read, mmio_write, mmio);
 245 #if defined(DEBUG_MMIO)
 246         printf("%s: base " PADDRX " len %08x %d\n", __func__,
 247                base, TARGET_PAGE_SIZE, mmio_memory);
 248 #endif
 249         cpu_register_physical_memory(base, TARGET_PAGE_SIZE, mmio_memory);
 250         ppc4xx_mmio_register(env, mmio, 0, TARGET_PAGE_SIZE,
 251                              unassigned_mmio_read, unassigned_mmio_write,
 252                              mmio);
 253     }
 254
 255     return mmio;
 256 }
 257
 258 /*****************************************************************************/
 259 /* "Universal" Interrupt controller */
 260 enum {
 261     DCR_UICSR  = 0x000,
 262     DCR_UICSRS = 0x001,
 263     DCR_UICER  = 0x002,
 264     DCR_UICCR  = 0x003,
 265     DCR_UICPR  = 0x004,
 266     DCR_UICTR  = 0x005,
 267     DCR_UICMSR = 0x006,
 268     DCR_UICVR  = 0x007,
 269     DCR_UICVCR = 0x008,
 270     DCR_UICMAX = 0x009,
 271 };
 272
 273 #define UIC_MAX_IRQ 32
 274 typedef struct ppcuic_t ppcuic_t;
 275 struct ppcuic_t {
 276     uint32_t dcr_base;
 277     int use_vectors;
 278     uint32_t level;  /* Remembers the state of level-triggered interrupts. */
 279     uint32_t uicsr;  /* Status register */
 280     uint32_t uicer;  /* Enable register */
 281     uint32_t uiccr;  /* Critical register */
 282     uint32_t uicpr;  /* Polarity register */
 283     uint32_t uictr;  /* Triggering register */
 284     uint32_t uicvcr; /* Vector configuration register */
 285     uint32_t uicvr;
 286     qemu_irq *irqs;
 287 };
 288
 289 static void ppcuic_trigger_irq (ppcuic_t *uic)
 290 {
 291     uint32_t ir, cr;
 292     int start, end, inc, i;
 293
 294     /* Trigger interrupt if any is pending */
 295     ir = uic->uicsr & uic->uicer & (~uic->uiccr);
 296     cr = uic->uicsr & uic->uicer & uic->uiccr;
 297 #ifdef DEBUG_UIC
 298     if (loglevel & CPU_LOG_INT) {
 299         fprintf(logfile, "%s: uicsr %08" PRIx32 " uicer %08" PRIx32
 300                 " uiccr %08" PRIx32 "\n"
 301                 "   %08" PRIx32 " ir %08" PRIx32 " cr %08" PRIx32 "\n",
 302                 __func__, uic->uicsr, uic->uicer, uic->uiccr,
 303                 uic->uicsr & uic->uicer, ir, cr);
 304     }
 305 #endif
 306     if (ir != 0x0000000) {
 307 #ifdef DEBUG_UIC
 308         if (loglevel & CPU_LOG_INT) {
 309             fprintf(logfile, "Raise UIC interrupt\n");
 310         }
 311 #endif
 312         qemu_irq_raise(uic->irqs[PPCUIC_OUTPUT_INT]);
 313     } else {
 314 #ifdef DEBUG_UIC
 315         if (loglevel & CPU_LOG_INT) {
 316             fprintf(logfile, "Lower UIC interrupt\n");
 317         }
 318 #endif
 319         qemu_irq_lower(uic->irqs[PPCUIC_OUTPUT_INT]);
 320     }
 321     /* Trigger critical interrupt if any is pending and update vector */
 322     if (cr != 0x0000000) {
 323         qemu_irq_raise(uic->irqs[PPCUIC_OUTPUT_CINT]);
 324         if (uic->use_vectors) {
 325             /* Compute critical IRQ vector */
 326             if (uic->uicvcr & 1) {
 327                 start = 31;
 328                 end = 0;
 329                 inc = -1;
 330             } else {
 331                 start = 0;
 332                 end = 31;
 333                 inc = 1;
 334             }
 335             uic->uicvr = uic->uicvcr & 0xFFFFFFFC;
 336             for (i = start; i <= end; i += inc) {
 337                 if (cr & (1 << i)) {
 338                     uic->uicvr += (i - start) * 512 * inc;
 339                     break;
 340                 }
 341             }
 342         }
 343 #ifdef DEBUG_UIC
 344         if (loglevel & CPU_LOG_INT) {
 345             fprintf(logfile, "Raise UIC critical interrupt - "
 346                     "vector %08" PRIx32 "\n", uic->uicvr);
 347         }
 348 #endif
 349     } else {
 350 #ifdef DEBUG_UIC
 351         if (loglevel & CPU_LOG_INT) {
 352             fprintf(logfile, "Lower UIC critical interrupt\n");
 353         }
 354 #endif
 355         qemu_irq_lower(uic->irqs[PPCUIC_OUTPUT_CINT]);
 356         uic->uicvr = 0x00000000;
 357     }
 358 }
 359
 360 static void ppcuic_set_irq (void *opaque, int irq_num, int level)
 361 {
 362     ppcuic_t *uic;
 363     uint32_t mask, sr;
 364
 365     uic = opaque;
 366     mask = 1 << (31-irq_num);
 367 #ifdef DEBUG_UIC
 368     if (loglevel & CPU_LOG_INT) {
 369         fprintf(logfile, "%s: irq %d level %d uicsr %08" PRIx32
 370                 " mask %08" PRIx32 " => %08" PRIx32 " %08" PRIx32 "\n",
 371                 __func__, irq_num, level,
 372                 uic->uicsr, mask, uic->uicsr & mask, level << irq_num);
 373     }
 374 #endif
 375     if (irq_num < 0 || irq_num > 31)
 376         return;
 377     sr = uic->uicsr;
 378
 379     /* Update status register */
 380     if (uic->uictr & mask) {
 381         /* Edge sensitive interrupt */
 382         if (level == 1)
 383             uic->uicsr |= mask;
 384     } else {
 385         /* Level sensitive interrupt */
 386         if (level == 1) {
 387             uic->uicsr |= mask;
 388             uic->level |= mask;
 389         } else {
 390             uic->uicsr &= ~mask;
 391             uic->level &= ~mask;
 392         }
 393     }
 394 #ifdef DEBUG_UIC
 395     if (loglevel & CPU_LOG_INT) {
 396         fprintf(logfile, "%s: irq %d level %d sr %" PRIx32 " => "
 397                 "%08" PRIx32 "\n", __func__, irq_num, level, uic->uicsr, sr);
 398     }
 399 #endif
 400     if (sr != uic->uicsr)
 401         ppcuic_trigger_irq(uic);
 402 }
 403
 404 static target_ulong dcr_read_uic (void *opaque, int dcrn)
 405 {
 406     ppcuic_t *uic;
 407     target_ulong ret;
 408
 409     uic = opaque;
 410     dcrn -= uic->dcr_base;
 411     switch (dcrn) {
 412     case DCR_UICSR:
 413     case DCR_UICSRS:
 414         ret = uic->uicsr;
 415         break;
 416     case DCR_UICER:
 417         ret = uic->uicer;
 418         break;
 419     case DCR_UICCR:
 420         ret = uic->uiccr;
 421         break;
 422     case DCR_UICPR:
 423         ret = uic->uicpr;
 424         break;
 425     case DCR_UICTR:
 426         ret = uic->uictr;
 427         break;
 428     case DCR_UICMSR:
 429         ret = uic->uicsr & uic->uicer;
 430         break;
 431     case DCR_UICVR:
 432         if (!uic->use_vectors)
 433             goto no_read;
 434         ret = uic->uicvr;
 435         break;
 436     case DCR_UICVCR:
 437         if (!uic->use_vectors)
 438             goto no_read;
 439         ret = uic->uicvcr;
 440         break;
 441     default:
 442     no_read:
 443         ret = 0x00000000;
 444         break;
 445     }
 446
 447     return ret;
 448 }
 449
 450 static void dcr_write_uic (void *opaque, int dcrn, target_ulong val)
 451 {
 452     ppcuic_t *uic;
 453
 454     uic = opaque;
 455     dcrn -= uic->dcr_base;
 456 #ifdef DEBUG_UIC
 457     if (loglevel & CPU_LOG_INT) {
 458         fprintf(logfile, "%s: dcr %d val " ADDRX "\n", __func__, dcrn, val);
 459     }
 460 #endif
 461     switch (dcrn) {
 462     case DCR_UICSR:
 463         uic->uicsr &= ~val;
 464         uic->uicsr |= uic->level;
 465         ppcuic_trigger_irq(uic);
 466         break;
 467     case DCR_UICSRS:
 468         uic->uicsr |= val;
 469         ppcuic_trigger_irq(uic);
 470         break;
 471     case DCR_UICER:
 472         uic->uicer = val;
 473         ppcuic_trigger_irq(uic);
 474         break;
 475     case DCR_UICCR:
 476         uic->uiccr = val;
 477         ppcuic_trigger_irq(uic);
 478         break;
 479     case DCR_UICPR:
 480         uic->uicpr = val;
 481         break;
 482     case DCR_UICTR:
 483         uic->uictr = val;
 484         ppcuic_trigger_irq(uic);
 485         break;
 486     case DCR_UICMSR:
 487         break;
 488     case DCR_UICVR:
 489         break;
 490     case DCR_UICVCR:
 491         uic->uicvcr = val & 0xFFFFFFFD;
 492         ppcuic_trigger_irq(uic);
 493         break;
 494     }
 495 }
 496
 497 static void ppcuic_reset (void *opaque)
 498 {
 499     ppcuic_t *uic;
 500
 501     uic = opaque;
 502     uic->uiccr = 0x00000000;
 503     uic->uicer = 0x00000000;
 504     uic->uicpr = 0x00000000;
 505     uic->uicsr = 0x00000000;
 506     uic->uictr = 0x00000000;
 507     if (uic->use_vectors) {
 508         uic->uicvcr = 0x00000000;
 509         uic->uicvr = 0x0000000;
 510     }
 511 }
 512
 513 qemu_irq *ppcuic_init (CPUState *env, qemu_irq *irqs,
 514                        uint32_t dcr_base, int has_ssr, int has_vr)
 515 {
 516     ppcuic_t *uic;
 517     int i;
 518
 519     uic = qemu_mallocz(sizeof(ppcuic_t));
 520     if (uic != NULL) {
 521         uic->dcr_base = dcr_base;
 522         uic->irqs = irqs;
 523         if (has_vr)
 524             uic->use_vectors = 1;
 525         for (i = 0; i < DCR_UICMAX; i++) {
 526             ppc_dcr_register(env, dcr_base + i, uic,
 527                              &dcr_read_uic, &dcr_write_uic);
 528         }
 529         qemu_register_reset(ppcuic_reset, uic);
 530         ppcuic_reset(uic);
 531     }
 532
 533     return qemu_allocate_irqs(&ppcuic_set_irq, uic, UIC_MAX_IRQ);
 534 }