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
  29 extern int loglevel;
  30 extern FILE *logfile;
  31
  32 //#define DEBUG_MMIO
  33 //#define DEBUG_UNASSIGNED
  34 #define DEBUG_UIC
  35
  36 /*****************************************************************************/
  37 /* Generic PowerPC 4xx processor instanciation */
  38 CPUState *ppc4xx_init (const unsigned char *cpu_model,
  39                        clk_setup_t *cpu_clk, clk_setup_t *tb_clk,
  40                        uint32_t sysclk)
  41 {
  42     CPUState *env;
  43
  44     /* init CPUs */
  45     env = cpu_init(cpu_model);
  46     if (!env) {
  47         fprintf(stderr, "Unable to find PowerPC %s CPU definition\n",
  48                 cpu_model);
  49         exit(1);
  50     }
  51     cpu_clk->cb = NULL; /* We don't care about CPU clock frequency changes */
  52     cpu_clk->opaque = env;
  53     /* Set time-base frequency to sysclk */
  54     tb_clk->cb = ppc_emb_timers_init(env, sysclk);
  55     tb_clk->opaque = env;
  56     ppc_dcr_init(env, NULL, NULL);
  57     /* Register qemu callbacks */
  58     qemu_register_reset(&cpu_ppc_reset, env);
  59     register_savevm("cpu", 0, 3, cpu_save, cpu_load, env);
  60
  61     return env;
  62 }
  63
  64 /*****************************************************************************/
  65 /* Fake device used to map multiple devices in a single memory page */
  66 #define MMIO_AREA_BITS 8
  67 #define MMIO_AREA_LEN (1 << MMIO_AREA_BITS)
  68 #define MMIO_AREA_NB (1 << (TARGET_PAGE_BITS - MMIO_AREA_BITS))
  69 #define MMIO_IDX(addr) (((addr) >> MMIO_AREA_BITS) & (MMIO_AREA_NB - 1))
  70 struct ppc4xx_mmio_t {
  71     target_phys_addr_t base;
  72     CPUReadMemoryFunc **mem_read[MMIO_AREA_NB];
  73     CPUWriteMemoryFunc **mem_write[MMIO_AREA_NB];
  74     void *opaque[MMIO_AREA_NB];
  75 };
  76
  77 static uint32_t unassigned_mmio_readb (void *opaque, target_phys_addr_t addr)
  78 {
  79 #ifdef DEBUG_UNASSIGNED
  80     ppc4xx_mmio_t *mmio;
  81
  82     mmio = opaque;
  83     printf("Unassigned mmio read 0x" PADDRX " base " PADDRX "\n",
  84            addr, mmio->base);
  85 #endif
  86
  87     return 0;
  88 }
  89
  90 static void unassigned_mmio_writeb (void *opaque,
  91                                     target_phys_addr_t addr, uint32_t val)
  92 {
  93 #ifdef DEBUG_UNASSIGNED
  94     ppc4xx_mmio_t *mmio;
  95
  96     mmio = opaque;
  97     printf("Unassigned mmio write 0x" PADDRX " = 0x%x base " PADDRX "\n",
  98            addr, val, mmio->base);
  99 #endif
 100 }
 101
 102 static CPUReadMemoryFunc *unassigned_mmio_read[3] = {
 103     unassigned_mmio_readb,
 104     unassigned_mmio_readb,
 105     unassigned_mmio_readb,
 106 };
 107
 108 static CPUWriteMemoryFunc *unassigned_mmio_write[3] = {
 109     unassigned_mmio_writeb,
 110     unassigned_mmio_writeb,
 111     unassigned_mmio_writeb,
 112 };
 113
 114 static uint32_t mmio_readlen (ppc4xx_mmio_t *mmio,
 115                               target_phys_addr_t addr, int len)
 116 {
 117     CPUReadMemoryFunc **mem_read;
 118     uint32_t ret;
 119     int idx;
 120
 121     idx = MMIO_IDX(addr - mmio->base);
 122 #if defined(DEBUG_MMIO)
 123     printf("%s: mmio %p len %d addr " PADDRX " idx %d\n", __func__,
 124            mmio, len, addr, idx);
 125 #endif
 126     mem_read = mmio->mem_read[idx];
 127     ret = (*mem_read[len])(mmio->opaque[idx], addr - mmio->base);
 128
 129     return ret;
 130 }
 131
 132 static void mmio_writelen (ppc4xx_mmio_t *mmio,
 133                            target_phys_addr_t addr, uint32_t value, int len)
 134 {
 135     CPUWriteMemoryFunc **mem_write;
 136     int idx;
 137
 138     idx = MMIO_IDX(addr - mmio->base);
 139 #if defined(DEBUG_MMIO)
 140     printf("%s: mmio %p len %d addr " PADDRX " idx %d value %08" PRIx32 "\n",
 141            __func__, mmio, len, addr, idx, value);
 142 #endif
 143     mem_write = mmio->mem_write[idx];
 144     (*mem_write[len])(mmio->opaque[idx], addr - mmio->base, value);
 145 }
 146
 147 static uint32_t mmio_readb (void *opaque, target_phys_addr_t addr)
 148 {
 149 #if defined(DEBUG_MMIO)
 150     printf("%s: addr " PADDRX "\n", __func__, addr);
 151 #endif
 152
 153     return mmio_readlen(opaque, addr, 0);
 154 }
 155
 156 static void mmio_writeb (void *opaque,
 157                          target_phys_addr_t addr, uint32_t value)
 158 {
 159 #if defined(DEBUG_MMIO)
 160     printf("%s: addr " PADDRX " val %08" PRIx32 "\n", __func__, addr, value);
 161 #endif
 162     mmio_writelen(opaque, addr, value, 0);
 163 }
 164
 165 static uint32_t mmio_readw (void *opaque, target_phys_addr_t addr)
 166 {
 167 #if defined(DEBUG_MMIO)
 168     printf("%s: addr " PADDRX "\n", __func__, addr);
 169 #endif
 170
 171     return mmio_readlen(opaque, addr, 1);
 172 }
 173
 174 static void mmio_writew (void *opaque,
 175                          target_phys_addr_t addr, uint32_t value)
 176 {
 177 #if defined(DEBUG_MMIO)
 178     printf("%s: addr " PADDRX " val %08" PRIx32 "\n", __func__, addr, value);
 179 #endif
 180     mmio_writelen(opaque, addr, value, 1);
 181 }
 182
 183 static uint32_t mmio_readl (void *opaque, target_phys_addr_t addr)
 184 {
 185 #if defined(DEBUG_MMIO)
 186     printf("%s: addr " PADDRX "\n", __func__, addr);
 187 #endif
 188
 189     return mmio_readlen(opaque, addr, 2);
 190 }
 191
 192 static void mmio_writel (void *opaque,
 193                          target_phys_addr_t addr, uint32_t value)
 194 {
 195 #if defined(DEBUG_MMIO)
 196     printf("%s: addr " PADDRX " val %08" PRIx32 "\n", __func__, addr, value);
 197 #endif
 198     mmio_writelen(opaque, addr, value, 2);
 199 }
 200
 201 static CPUReadMemoryFunc *mmio_read[] = {
 202     &mmio_readb,
 203     &mmio_readw,
 204     &mmio_readl,
 205 };
 206
 207 static CPUWriteMemoryFunc *mmio_write[] = {
 208     &mmio_writeb,
 209     &mmio_writew,
 210     &mmio_writel,
 211 };
 212
 213 int ppc4xx_mmio_register (CPUState *env, ppc4xx_mmio_t *mmio,
 214                           target_phys_addr_t offset, uint32_t len,
 215                           CPUReadMemoryFunc **mem_read,
 216                           CPUWriteMemoryFunc **mem_write, void *opaque)
 217 {
 218     target_phys_addr_t end;
 219     int idx, eidx;
 220
 221     if ((offset + len) > TARGET_PAGE_SIZE)
 222         return -1;
 223     idx = MMIO_IDX(offset);
 224     end = offset + len - 1;
 225     eidx = MMIO_IDX(end);
 226 #if defined(DEBUG_MMIO)
 227     printf("%s: offset " PADDRX " len %08" PRIx32 " " PADDRX " %d %d\n",
 228            __func__, offset, len, end, idx, eidx);
 229 #endif
 230     for (; idx <= eidx; idx++) {
 231         mmio->mem_read[idx] = mem_read;
 232         mmio->mem_write[idx] = mem_write;
 233         mmio->opaque[idx] = opaque;
 234     }
 235
 236     return 0;
 237 }
 238
 239 ppc4xx_mmio_t *ppc4xx_mmio_init (CPUState *env, target_phys_addr_t base)
 240 {
 241     ppc4xx_mmio_t *mmio;
 242     int mmio_memory;
 243
 244     mmio = qemu_mallocz(sizeof(ppc4xx_mmio_t));
 245     if (mmio != NULL) {
 246         mmio->base = base;
 247         mmio_memory = cpu_register_io_memory(0, mmio_read, mmio_write, mmio);
 248 #if defined(DEBUG_MMIO)
 249         printf("%s: base " PADDRX " len %08x %d\n", __func__,
 250                base, TARGET_PAGE_SIZE, mmio_memory);
 251 #endif
 252         cpu_register_physical_memory(base, TARGET_PAGE_SIZE, mmio_memory);
 253         ppc4xx_mmio_register(env, mmio, 0, TARGET_PAGE_SIZE,
 254                              unassigned_mmio_read, unassigned_mmio_write,
 255                              mmio);
 256     }
 257
 258     return mmio;
 259 }
 260
 261 /*****************************************************************************/
 262 /* "Universal" Interrupt controller */
 263 enum {
 264     DCR_UICSR  = 0x000,
 265     DCR_UICSRS = 0x001,
 266     DCR_UICER  = 0x002,
 267     DCR_UICCR  = 0x003,
 268     DCR_UICPR  = 0x004,
 269     DCR_UICTR  = 0x005,
 270     DCR_UICMSR = 0x006,
 271     DCR_UICVR  = 0x007,
 272     DCR_UICVCR = 0x008,
 273     DCR_UICMAX = 0x009,
 274 };
 275
 276 #define UIC_MAX_IRQ 32
 277 typedef struct ppcuic_t ppcuic_t;
 278 struct ppcuic_t {
 279     uint32_t dcr_base;
 280     int use_vectors;
 281     uint32_t uicsr;  /* Status register */
 282     uint32_t uicer;  /* Enable register */
 283     uint32_t uiccr;  /* Critical register */
 284     uint32_t uicpr;  /* Polarity register */
 285     uint32_t uictr;  /* Triggering register */
 286     uint32_t uicvcr; /* Vector configuration register */
 287     uint32_t uicvr;
 288     qemu_irq *irqs;
 289 };
 290
 291 static void ppcuic_trigger_irq (ppcuic_t *uic)
 292 {
 293     uint32_t ir, cr;
 294     int start, end, inc, i;
 295
 296     /* Trigger interrupt if any is pending */
 297     ir = uic->uicsr & uic->uicer & (~uic->uiccr);
 298     cr = uic->uicsr & uic->uicer & uic->uiccr;
 299 #ifdef DEBUG_UIC
 300     if (loglevel & CPU_LOG_INT) {
 301         fprintf(logfile, "%s: uicsr %08" PRIx32 " uicer %08" PRIx32
 302                 " uiccr %08" PRIx32 "\n"
 303                 "   %08" PRIx32 " ir %08" PRIx32 " cr %08" PRIx32 "\n",
 304                 __func__, uic->uicsr, uic->uicer, uic->uiccr,
 305                 uic->uicsr & uic->uicer, ir, cr);
 306     }
 307 #endif
 308     if (ir != 0x0000000) {
 309 #ifdef DEBUG_UIC
 310         if (loglevel & CPU_LOG_INT) {
 311             fprintf(logfile, "Raise UIC interrupt\n");
 312         }
 313 #endif
 314         qemu_irq_raise(uic->irqs[PPCUIC_OUTPUT_INT]);
 315     } else {
 316 #ifdef DEBUG_UIC
 317         if (loglevel & CPU_LOG_INT) {
 318             fprintf(logfile, "Lower UIC interrupt\n");
 319         }
 320 #endif
 321         qemu_irq_lower(uic->irqs[PPCUIC_OUTPUT_INT]);
 322     }
 323     /* Trigger critical interrupt if any is pending and update vector */
 324     if (cr != 0x0000000) {
 325         qemu_irq_raise(uic->irqs[PPCUIC_OUTPUT_CINT]);
 326         if (uic->use_vectors) {
 327             /* Compute critical IRQ vector */
 328             if (uic->uicvcr & 1) {
 329                 start = 31;
 330                 end = 0;
 331                 inc = -1;
 332             } else {
 333                 start = 0;
 334                 end = 31;
 335                 inc = 1;
 336             }
 337             uic->uicvr = uic->uicvcr & 0xFFFFFFFC;
 338             for (i = start; i <= end; i += inc) {
 339                 if (cr & (1 << i)) {
 340                     uic->uicvr += (i - start) * 512 * inc;
 341                     break;
 342                 }
 343             }
 344         }
 345 #ifdef DEBUG_UIC
 346         if (loglevel & CPU_LOG_INT) {
 347             fprintf(logfile, "Raise UIC critical interrupt - "
 348                     "vector %08" PRIx32 "\n", uic->uicvr);
 349         }
 350 #endif
 351     } else {
 352 #ifdef DEBUG_UIC
 353         if (loglevel & CPU_LOG_INT) {
 354             fprintf(logfile, "Lower UIC critical interrupt\n");
 355         }
 356 #endif
 357         qemu_irq_lower(uic->irqs[PPCUIC_OUTPUT_CINT]);
 358         uic->uicvr = 0x00000000;
 359     }
 360 }
 361
 362 static void ppcuic_set_irq (void *opaque, int irq_num, int level)
 363 {
 364     ppcuic_t *uic;
 365     uint32_t mask, sr;
 366
 367     uic = opaque;
 368     mask = 1 << irq_num;
 369 #ifdef DEBUG_UIC
 370     if (loglevel & CPU_LOG_INT) {
 371         fprintf(logfile, "%s: irq %d level %d uicsr %08" PRIx32
 372                 " mask %08" PRIx32 " => %08" PRIx32 " %08" PRIx32 "\n",
 373                 __func__, irq_num, level,
 374                 uic->uicsr, mask, uic->uicsr & mask, level << irq_num);
 375     }
 376 #endif
 377     if (irq_num < 0 || irq_num > 31)
 378         return;
 379     sr = uic->uicsr;
 380     if (!(uic->uicpr & mask)) {
 381         /* Negatively asserted IRQ */
 382         level = level == 0 ? 1 : 0;
 383     }
 384     /* Update status register */
 385     if (uic->uictr & mask) {
 386         /* Edge sensitive interrupt */
 387         if (level == 1)
 388             uic->uicsr |= mask;
 389     } else {
 390         /* Level sensitive interrupt */
 391         if (level == 1)
 392             uic->uicsr |= mask;
 393         else
 394             uic->uicsr &= ~mask;
 395     }
 396 #ifdef DEBUG_UIC
 397     if (loglevel & CPU_LOG_INT) {
 398         fprintf(logfile, "%s: irq %d level %d sr %" PRIx32 " => "
 399                 "%08" PRIx32 "\n", __func__, irq_num, level, uic->uicsr, sr);
 400     }
 401 #endif
 402     if (sr != uic->uicsr)
 403         ppcuic_trigger_irq(uic);
 404 }
 405
 406 static target_ulong dcr_read_uic (void *opaque, int dcrn)
 407 {
 408     ppcuic_t *uic;
 409     target_ulong ret;
 410
 411     uic = opaque;
 412     dcrn -= uic->dcr_base;
 413     switch (dcrn) {
 414     case DCR_UICSR:
 415     case DCR_UICSRS:
 416         ret = uic->uicsr;
 417         break;
 418     case DCR_UICER:
 419         ret = uic->uicer;
 420         break;
 421     case DCR_UICCR:
 422         ret = uic->uiccr;
 423         break;
 424     case DCR_UICPR:
 425         ret = uic->uicpr;
 426         break;
 427     case DCR_UICTR:
 428         ret = uic->uictr;
 429         break;
 430     case DCR_UICMSR:
 431         ret = uic->uicsr & uic->uicer;
 432         break;
 433     case DCR_UICVR:
 434         if (!uic->use_vectors)
 435             goto no_read;
 436         ret = uic->uicvr;
 437         break;
 438     case DCR_UICVCR:
 439         if (!uic->use_vectors)
 440             goto no_read;
 441         ret = uic->uicvcr;
 442         break;
 443     default:
 444     no_read:
 445         ret = 0x00000000;
 446         break;
 447     }
 448
 449     return ret;
 450 }
 451
 452 static void dcr_write_uic (void *opaque, int dcrn, target_ulong val)
 453 {
 454     ppcuic_t *uic;
 455
 456     uic = opaque;
 457     dcrn -= uic->dcr_base;
 458 #ifdef DEBUG_UIC
 459     if (loglevel & CPU_LOG_INT) {
 460         fprintf(logfile, "%s: dcr %d val " ADDRX "\n", __func__, dcrn, val);
 461     }
 462 #endif
 463     switch (dcrn) {
 464     case DCR_UICSR:
 465         uic->uicsr &= ~val;
 466         ppcuic_trigger_irq(uic);
 467         break;
 468     case DCR_UICSRS:
 469         uic->uicsr |= val;
 470         ppcuic_trigger_irq(uic);
 471         break;
 472     case DCR_UICER:
 473         uic->uicer = val;
 474         ppcuic_trigger_irq(uic);
 475         break;
 476     case DCR_UICCR:
 477         uic->uiccr = val;
 478         ppcuic_trigger_irq(uic);
 479         break;
 480     case DCR_UICPR:
 481         uic->uicpr = val;
 482         ppcuic_trigger_irq(uic);
 483         break;
 484     case DCR_UICTR:
 485         uic->uictr = val;
 486         ppcuic_trigger_irq(uic);
 487         break;
 488     case DCR_UICMSR:
 489         break;
 490     case DCR_UICVR:
 491         break;
 492     case DCR_UICVCR:
 493         uic->uicvcr = val & 0xFFFFFFFD;
 494         ppcuic_trigger_irq(uic);
 495         break;
 496     }
 497 }
 498
 499 static void ppcuic_reset (void *opaque)
 500 {
 501     ppcuic_t *uic;
 502
 503     uic = opaque;
 504     uic->uiccr = 0x00000000;
 505     uic->uicer = 0x00000000;
 506     uic->uicpr = 0x00000000;
 507     uic->uicsr = 0x00000000;
 508     uic->uictr = 0x00000000;
 509     if (uic->use_vectors) {
 510         uic->uicvcr = 0x00000000;
 511         uic->uicvr = 0x0000000;
 512     }
 513 }
 514
 515 qemu_irq *ppcuic_init (CPUState *env, qemu_irq *irqs,
 516                        uint32_t dcr_base, int has_ssr, int has_vr)
 517 {
 518     ppcuic_t *uic;
 519     int i;
 520
 521     uic = qemu_mallocz(sizeof(ppcuic_t));
 522     if (uic != NULL) {
 523         uic->dcr_base = dcr_base;
 524         uic->irqs = irqs;
 525         if (has_vr)
 526             uic->use_vectors = 1;
 527         for (i = 0; i < DCR_UICMAX; i++) {
 528             ppc_dcr_register(env, dcr_base + i, uic,
 529                              &dcr_read_uic, &dcr_write_uic);
 530         }
 531         qemu_register_reset(ppcuic_reset, uic);
 532         ppcuic_reset(uic);
 533     }
 534
 535     return qemu_allocate_irqs(&ppcuic_set_irq, uic, UIC_MAX_IRQ);
 536 }