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 #ifdef DEBUG_UIC
  36 #  define LOG_UIC(...) qemu_log_mask(CPU_LOG_INT, ## __VA_ARGS__)
  37 #else
  38 #  define LOG_UIC(...) do { } while (0)
  39 #endif
  40
  41 /*****************************************************************************/
  42 /* Generic PowerPC 4xx processor instanciation */
  43 CPUState *ppc4xx_init (const char *cpu_model,
  44                        clk_setup_t *cpu_clk, clk_setup_t *tb_clk,
  45                        uint32_t sysclk)
  46 {
  47     CPUState *env;
  48
  49     /* init CPUs */
  50     env = cpu_init(cpu_model);
  51     if (!env) {
  52         fprintf(stderr, "Unable to find PowerPC %s CPU definition\n",
  53                 cpu_model);
  54         exit(1);
  55     }
  56     cpu_clk->cb = NULL; /* We don't care about CPU clock frequency changes */
  57     cpu_clk->opaque = env;
  58     /* Set time-base frequency to sysclk */
  59     tb_clk->cb = ppc_emb_timers_init(env, sysclk, PPC_INTERRUPT_PIT);
  60     tb_clk->opaque = env;
  61     ppc_dcr_init(env, NULL, NULL);
  62     /* Register qemu callbacks */
  63     qemu_register_reset((QEMUResetHandler*)&cpu_reset, env);
  64
  65     return env;
  66 }
  67
  68 /*****************************************************************************/
  69 /* "Universal" Interrupt controller */
  70 enum {
  71     DCR_UICSR  = 0x000,
  72     DCR_UICSRS = 0x001,
  73     DCR_UICER  = 0x002,
  74     DCR_UICCR  = 0x003,
  75     DCR_UICPR  = 0x004,
  76     DCR_UICTR  = 0x005,
  77     DCR_UICMSR = 0x006,
  78     DCR_UICVR  = 0x007,
  79     DCR_UICVCR = 0x008,
  80     DCR_UICMAX = 0x009,
  81 };
  82
  83 #define UIC_MAX_IRQ 32
  84 typedef struct ppcuic_t ppcuic_t;
  85 struct ppcuic_t {
  86     uint32_t dcr_base;
  87     int use_vectors;
  88     uint32_t level;  /* Remembers the state of level-triggered interrupts. */
  89     uint32_t uicsr;  /* Status register */
  90     uint32_t uicer;  /* Enable register */
  91     uint32_t uiccr;  /* Critical register */
  92     uint32_t uicpr;  /* Polarity register */
  93     uint32_t uictr;  /* Triggering register */
  94     uint32_t uicvcr; /* Vector configuration register */
  95     uint32_t uicvr;
  96     qemu_irq *irqs;
  97 };
  98
  99 static void ppcuic_trigger_irq (ppcuic_t *uic)
 100 {
 101     uint32_t ir, cr;
 102     int start, end, inc, i;
 103
 104     /* Trigger interrupt if any is pending */
 105     ir = uic->uicsr & uic->uicer & (~uic->uiccr);
 106     cr = uic->uicsr & uic->uicer & uic->uiccr;
 107     LOG_UIC("%s: uicsr %08" PRIx32 " uicer %08" PRIx32
 108                 " uiccr %08" PRIx32 "\n"
 109                 "   %08" PRIx32 " ir %08" PRIx32 " cr %08" PRIx32 "\n",
 110                 __func__, uic->uicsr, uic->uicer, uic->uiccr,
 111                 uic->uicsr & uic->uicer, ir, cr);
 112     if (ir != 0x0000000) {
 113         LOG_UIC("Raise UIC interrupt\n");
 114         qemu_irq_raise(uic->irqs[PPCUIC_OUTPUT_INT]);
 115     } else {
 116         LOG_UIC("Lower UIC interrupt\n");
 117         qemu_irq_lower(uic->irqs[PPCUIC_OUTPUT_INT]);
 118     }
 119     /* Trigger critical interrupt if any is pending and update vector */
 120     if (cr != 0x0000000) {
 121         qemu_irq_raise(uic->irqs[PPCUIC_OUTPUT_CINT]);
 122         if (uic->use_vectors) {
 123             /* Compute critical IRQ vector */
 124             if (uic->uicvcr & 1) {
 125                 start = 31;
 126                 end = 0;
 127                 inc = -1;
 128             } else {
 129                 start = 0;
 130                 end = 31;
 131                 inc = 1;
 132             }
 133             uic->uicvr = uic->uicvcr & 0xFFFFFFFC;
 134             for (i = start; i <= end; i += inc) {
 135                 if (cr & (1 << i)) {
 136                     uic->uicvr += (i - start) * 512 * inc;
 137                     break;
 138                 }
 139             }
 140         }
 141         LOG_UIC("Raise UIC critical interrupt - "
 142                     "vector %08" PRIx32 "\n", uic->uicvr);
 143     } else {
 144         LOG_UIC("Lower UIC critical interrupt\n");
 145         qemu_irq_lower(uic->irqs[PPCUIC_OUTPUT_CINT]);
 146         uic->uicvr = 0x00000000;
 147     }
 148 }
 149
 150 static void ppcuic_set_irq (void *opaque, int irq_num, int level)
 151 {
 152     ppcuic_t *uic;
 153     uint32_t mask, sr;
 154
 155     uic = opaque;
 156     mask = 1 << (31-irq_num);
 157     LOG_UIC("%s: irq %d level %d uicsr %08" PRIx32
 158                 " mask %08" PRIx32 " => %08" PRIx32 " %08" PRIx32 "\n",
 159                 __func__, irq_num, level,
 160                 uic->uicsr, mask, uic->uicsr & mask, level << irq_num);
 161     if (irq_num < 0 || irq_num > 31)
 162         return;
 163     sr = uic->uicsr;
 164
 165     /* Update status register */
 166     if (uic->uictr & mask) {
 167         /* Edge sensitive interrupt */
 168         if (level == 1)
 169             uic->uicsr |= mask;
 170     } else {
 171         /* Level sensitive interrupt */
 172         if (level == 1) {
 173             uic->uicsr |= mask;
 174             uic->level |= mask;
 175         } else {
 176             uic->uicsr &= ~mask;
 177             uic->level &= ~mask;
 178         }
 179     }
 180     LOG_UIC("%s: irq %d level %d sr %" PRIx32 " => "
 181                 "%08" PRIx32 "\n", __func__, irq_num, level, uic->uicsr, sr);
 182     if (sr != uic->uicsr)
 183         ppcuic_trigger_irq(uic);
 184 }
 185
 186 static uint32_t dcr_read_uic (void *opaque, int dcrn)
 187 {
 188     ppcuic_t *uic;
 189     uint32_t ret;
 190
 191     uic = opaque;
 192     dcrn -= uic->dcr_base;
 193     switch (dcrn) {
 194     case DCR_UICSR:
 195     case DCR_UICSRS:
 196         ret = uic->uicsr;
 197         break;
 198     case DCR_UICER:
 199         ret = uic->uicer;
 200         break;
 201     case DCR_UICCR:
 202         ret = uic->uiccr;
 203         break;
 204     case DCR_UICPR:
 205         ret = uic->uicpr;
 206         break;
 207     case DCR_UICTR:
 208         ret = uic->uictr;
 209         break;
 210     case DCR_UICMSR:
 211         ret = uic->uicsr & uic->uicer;
 212         break;
 213     case DCR_UICVR:
 214         if (!uic->use_vectors)
 215             goto no_read;
 216         ret = uic->uicvr;
 217         break;
 218     case DCR_UICVCR:
 219         if (!uic->use_vectors)
 220             goto no_read;
 221         ret = uic->uicvcr;
 222         break;
 223     default:
 224     no_read:
 225         ret = 0x00000000;
 226         break;
 227     }
 228
 229     return ret;
 230 }
 231
 232 static void dcr_write_uic (void *opaque, int dcrn, uint32_t val)
 233 {
 234     ppcuic_t *uic;
 235
 236     uic = opaque;
 237     dcrn -= uic->dcr_base;
 238     LOG_UIC("%s: dcr %d val 0x%x\n", __func__, dcrn, val);
 239     switch (dcrn) {
 240     case DCR_UICSR:
 241         uic->uicsr &= ~val;
 242         uic->uicsr |= uic->level;
 243         ppcuic_trigger_irq(uic);
 244         break;
 245     case DCR_UICSRS:
 246         uic->uicsr |= val;
 247         ppcuic_trigger_irq(uic);
 248         break;
 249     case DCR_UICER:
 250         uic->uicer = val;
 251         ppcuic_trigger_irq(uic);
 252         break;
 253     case DCR_UICCR:
 254         uic->uiccr = val;
 255         ppcuic_trigger_irq(uic);
 256         break;
 257     case DCR_UICPR:
 258         uic->uicpr = val;
 259         break;
 260     case DCR_UICTR:
 261         uic->uictr = val;
 262         ppcuic_trigger_irq(uic);
 263         break;
 264     case DCR_UICMSR:
 265         break;
 266     case DCR_UICVR:
 267         break;
 268     case DCR_UICVCR:
 269         uic->uicvcr = val & 0xFFFFFFFD;
 270         ppcuic_trigger_irq(uic);
 271         break;
 272     }
 273 }
 274
 275 static void ppcuic_reset (void *opaque)
 276 {
 277     ppcuic_t *uic;
 278
 279     uic = opaque;
 280     uic->uiccr = 0x00000000;
 281     uic->uicer = 0x00000000;
 282     uic->uicpr = 0x00000000;
 283     uic->uicsr = 0x00000000;
 284     uic->uictr = 0x00000000;
 285     if (uic->use_vectors) {
 286         uic->uicvcr = 0x00000000;
 287         uic->uicvr = 0x0000000;
 288     }
 289 }
 290
 291 qemu_irq *ppcuic_init (CPUState *env, qemu_irq *irqs,
 292                        uint32_t dcr_base, int has_ssr, int has_vr)
 293 {
 294     ppcuic_t *uic;
 295     int i;
 296
 297     uic = qemu_mallocz(sizeof(ppcuic_t));
 298     uic->dcr_base = dcr_base;
 299     uic->irqs = irqs;
 300     if (has_vr)
 301         uic->use_vectors = 1;
 302     for (i = 0; i < DCR_UICMAX; i++) {
 303         ppc_dcr_register(env, dcr_base + i, uic,
 304                          &dcr_read_uic, &dcr_write_uic);
 305     }
 306     qemu_register_reset(ppcuic_reset, uic);
 307
 308     return qemu_allocate_irqs(&ppcuic_set_irq, uic, UIC_MAX_IRQ);
 309 }
 310
 311 /*****************************************************************************/
 312 /* SDRAM controller */
 313 typedef struct ppc4xx_sdram_t ppc4xx_sdram_t;
 314 struct ppc4xx_sdram_t {
 315     uint32_t addr;
 316     int nbanks;
 317     target_phys_addr_t ram_bases[4];
 318     target_phys_addr_t ram_sizes[4];
 319     uint32_t besr0;
 320     uint32_t besr1;
 321     uint32_t bear;
 322     uint32_t cfg;
 323     uint32_t status;
 324     uint32_t rtr;
 325     uint32_t pmit;
 326     uint32_t bcr[4];
 327     uint32_t tr;
 328     uint32_t ecccfg;
 329     uint32_t eccesr;
 330     qemu_irq irq;
 331 };
 332
 333 enum {
 334     SDRAM0_CFGADDR = 0x010,
 335     SDRAM0_CFGDATA = 0x011,
 336 };
 337
 338 /* XXX: TOFIX: some patches have made this code become inconsistent:
 339  *      there are type inconsistencies, mixing target_phys_addr_t, target_ulong
 340  *      and uint32_t
 341  */
 342 static uint32_t sdram_bcr (target_phys_addr_t ram_base,
 343                            target_phys_addr_t ram_size)
 344 {
 345     uint32_t bcr;
 346
 347     switch (ram_size) {
 348     case (4 * 1024 * 1024):
 349         bcr = 0x00000000;
 350         break;
 351     case (8 * 1024 * 1024):
 352         bcr = 0x00020000;
 353         break;
 354     case (16 * 1024 * 1024):
 355         bcr = 0x00040000;
 356         break;
 357     case (32 * 1024 * 1024):
 358         bcr = 0x00060000;
 359         break;
 360     case (64 * 1024 * 1024):
 361         bcr = 0x00080000;
 362         break;
 363     case (128 * 1024 * 1024):
 364         bcr = 0x000A0000;
 365         break;
 366     case (256 * 1024 * 1024):
 367         bcr = 0x000C0000;
 368         break;
 369     default:
 370         printf("%s: invalid RAM size " TARGET_FMT_plx "\n", __func__,
 371                ram_size);
 372         return 0x00000000;
 373     }
 374     bcr |= ram_base & 0xFF800000;
 375     bcr |= 1;
 376
 377     return bcr;
 378 }
 379
 380 static inline target_phys_addr_t sdram_base(uint32_t bcr)
 381 {
 382     return bcr & 0xFF800000;
 383 }
 384
 385 static target_ulong sdram_size (uint32_t bcr)
 386 {
 387     target_ulong size;
 388     int sh;
 389
 390     sh = (bcr >> 17) & 0x7;
 391     if (sh == 7)
 392         size = -1;
 393     else
 394         size = (4 * 1024 * 1024) << sh;
 395
 396     return size;
 397 }
 398
 399 static void sdram_set_bcr (uint32_t *bcrp, uint32_t bcr, int enabled)
 400 {
 401     if (*bcrp & 0x00000001) {
 402         /* Unmap RAM */
 403 #ifdef DEBUG_SDRAM
 404         printf("%s: unmap RAM area " TARGET_FMT_plx " " TARGET_FMT_lx "\n",
 405                __func__, sdram_base(*bcrp), sdram_size(*bcrp));
 406 #endif
 407         cpu_register_physical_memory(sdram_base(*bcrp), sdram_size(*bcrp),
 408                                      IO_MEM_UNASSIGNED);
 409     }
 410     *bcrp = bcr & 0xFFDEE001;
 411     if (enabled && (bcr & 0x00000001)) {
 412 #ifdef DEBUG_SDRAM
 413         printf("%s: Map RAM area " TARGET_FMT_plx " " TARGET_FMT_lx "\n",
 414                __func__, sdram_base(bcr), sdram_size(bcr));
 415 #endif
 416         cpu_register_physical_memory(sdram_base(bcr), sdram_size(bcr),
 417                                      sdram_base(bcr) | IO_MEM_RAM);
 418     }
 419 }
 420
 421 static void sdram_map_bcr (ppc4xx_sdram_t *sdram)
 422 {
 423     int i;
 424
 425     for (i = 0; i < sdram->nbanks; i++) {
 426         if (sdram->ram_sizes[i] != 0) {
 427             sdram_set_bcr(&sdram->bcr[i],
 428                           sdram_bcr(sdram->ram_bases[i], sdram->ram_sizes[i]),
 429                           1);
 430         } else {
 431             sdram_set_bcr(&sdram->bcr[i], 0x00000000, 0);
 432         }
 433     }
 434 }
 435
 436 static void sdram_unmap_bcr (ppc4xx_sdram_t *sdram)
 437 {
 438     int i;
 439
 440     for (i = 0; i < sdram->nbanks; i++) {
 441 #ifdef DEBUG_SDRAM
 442         printf("%s: Unmap RAM area " TARGET_FMT_plx " " TARGET_FMT_lx "\n",
 443                __func__, sdram_base(sdram->bcr[i]), sdram_size(sdram->bcr[i]));
 444 #endif
 445         cpu_register_physical_memory(sdram_base(sdram->bcr[i]),
 446                                      sdram_size(sdram->bcr[i]),
 447                                      IO_MEM_UNASSIGNED);
 448     }
 449 }
 450
 451 static uint32_t dcr_read_sdram (void *opaque, int dcrn)
 452 {
 453     ppc4xx_sdram_t *sdram;
 454     uint32_t ret;
 455
 456     sdram = opaque;
 457     switch (dcrn) {
 458     case SDRAM0_CFGADDR:
 459         ret = sdram->addr;
 460         break;
 461     case SDRAM0_CFGDATA:
 462         switch (sdram->addr) {
 463         case 0x00: /* SDRAM_BESR0 */
 464             ret = sdram->besr0;
 465             break;
 466         case 0x08: /* SDRAM_BESR1 */
 467             ret = sdram->besr1;
 468             break;
 469         case 0x10: /* SDRAM_BEAR */
 470             ret = sdram->bear;
 471             break;
 472         case 0x20: /* SDRAM_CFG */
 473             ret = sdram->cfg;
 474             break;
 475         case 0x24: /* SDRAM_STATUS */
 476             ret = sdram->status;
 477             break;
 478         case 0x30: /* SDRAM_RTR */
 479             ret = sdram->rtr;
 480             break;
 481         case 0x34: /* SDRAM_PMIT */
 482             ret = sdram->pmit;
 483             break;
 484         case 0x40: /* SDRAM_B0CR */
 485             ret = sdram->bcr[0];
 486             break;
 487         case 0x44: /* SDRAM_B1CR */
 488             ret = sdram->bcr[1];
 489             break;
 490         case 0x48: /* SDRAM_B2CR */
 491             ret = sdram->bcr[2];
 492             break;
 493         case 0x4C: /* SDRAM_B3CR */
 494             ret = sdram->bcr[3];
 495             break;
 496         case 0x80: /* SDRAM_TR */
 497             ret = -1; /* ? */
 498             break;
 499         case 0x94: /* SDRAM_ECCCFG */
 500             ret = sdram->ecccfg;
 501             break;
 502         case 0x98: /* SDRAM_ECCESR */
 503             ret = sdram->eccesr;
 504             break;
 505         default: /* Error */
 506             ret = -1;
 507             break;
 508         }
 509         break;
 510     default:
 511         /* Avoid gcc warning */
 512         ret = 0x00000000;
 513         break;
 514     }
 515
 516     return ret;
 517 }
 518
 519 static void dcr_write_sdram (void *opaque, int dcrn, uint32_t val)
 520 {
 521     ppc4xx_sdram_t *sdram;
 522
 523     sdram = opaque;
 524     switch (dcrn) {
 525     case SDRAM0_CFGADDR:
 526         sdram->addr = val;
 527         break;
 528     case SDRAM0_CFGDATA:
 529         switch (sdram->addr) {
 530         case 0x00: /* SDRAM_BESR0 */
 531             sdram->besr0 &= ~val;
 532             break;
 533         case 0x08: /* SDRAM_BESR1 */
 534             sdram->besr1 &= ~val;
 535             break;
 536         case 0x10: /* SDRAM_BEAR */
 537             sdram->bear = val;
 538             break;
 539         case 0x20: /* SDRAM_CFG */
 540             val &= 0xFFE00000;
 541             if (!(sdram->cfg & 0x80000000) && (val & 0x80000000)) {
 542 #ifdef DEBUG_SDRAM
 543                 printf("%s: enable SDRAM controller\n", __func__);
 544 #endif
 545                 /* validate all RAM mappings */
 546                 sdram_map_bcr(sdram);
 547                 sdram->status &= ~0x80000000;
 548             } else if ((sdram->cfg & 0x80000000) && !(val & 0x80000000)) {
 549 #ifdef DEBUG_SDRAM
 550                 printf("%s: disable SDRAM controller\n", __func__);
 551 #endif
 552                 /* invalidate all RAM mappings */
 553                 sdram_unmap_bcr(sdram);
 554                 sdram->status |= 0x80000000;
 555             }
 556             if (!(sdram->cfg & 0x40000000) && (val & 0x40000000))
 557                 sdram->status |= 0x40000000;
 558             else if ((sdram->cfg & 0x40000000) && !(val & 0x40000000))
 559                 sdram->status &= ~0x40000000;
 560             sdram->cfg = val;
 561             break;
 562         case 0x24: /* SDRAM_STATUS */
 563             /* Read-only register */
 564             break;
 565         case 0x30: /* SDRAM_RTR */
 566             sdram->rtr = val & 0x3FF80000;
 567             break;
 568         case 0x34: /* SDRAM_PMIT */
 569             sdram->pmit = (val & 0xF8000000) | 0x07C00000;
 570             break;
 571         case 0x40: /* SDRAM_B0CR */
 572             sdram_set_bcr(&sdram->bcr[0], val, sdram->cfg & 0x80000000);
 573             break;
 574         case 0x44: /* SDRAM_B1CR */
 575             sdram_set_bcr(&sdram->bcr[1], val, sdram->cfg & 0x80000000);
 576             break;
 577         case 0x48: /* SDRAM_B2CR */
 578             sdram_set_bcr(&sdram->bcr[2], val, sdram->cfg & 0x80000000);
 579             break;
 580         case 0x4C: /* SDRAM_B3CR */
 581             sdram_set_bcr(&sdram->bcr[3], val, sdram->cfg & 0x80000000);
 582             break;
 583         case 0x80: /* SDRAM_TR */
 584             sdram->tr = val & 0x018FC01F;
 585             break;
 586         case 0x94: /* SDRAM_ECCCFG */
 587             sdram->ecccfg = val & 0x00F00000;
 588             break;
 589         case 0x98: /* SDRAM_ECCESR */
 590             val &= 0xFFF0F000;
 591             if (sdram->eccesr == 0 && val != 0)
 592                 qemu_irq_raise(sdram->irq);
 593             else if (sdram->eccesr != 0 && val == 0)
 594                 qemu_irq_lower(sdram->irq);
 595             sdram->eccesr = val;
 596             break;
 597         default: /* Error */
 598             break;
 599         }
 600         break;
 601     }
 602 }
 603
 604 static void sdram_reset (void *opaque)
 605 {
 606     ppc4xx_sdram_t *sdram;
 607
 608     sdram = opaque;
 609     sdram->addr = 0x00000000;
 610     sdram->bear = 0x00000000;
 611     sdram->besr0 = 0x00000000; /* No error */
 612     sdram->besr1 = 0x00000000; /* No error */
 613     sdram->cfg = 0x00000000;
 614     sdram->ecccfg = 0x00000000; /* No ECC */
 615     sdram->eccesr = 0x00000000; /* No error */
 616     sdram->pmit = 0x07C00000;
 617     sdram->rtr = 0x05F00000;
 618     sdram->tr = 0x00854009;
 619     /* We pre-initialize RAM banks */
 620     sdram->status = 0x00000000;
 621     sdram->cfg = 0x00800000;
 622 }
 623
 624 void ppc4xx_sdram_init (CPUState *env, qemu_irq irq, int nbanks,
 625                         target_phys_addr_t *ram_bases,
 626                         target_phys_addr_t *ram_sizes,
 627                         int do_init)
 628 {
 629     ppc4xx_sdram_t *sdram;
 630
 631     sdram = qemu_mallocz(sizeof(ppc4xx_sdram_t));
 632     sdram->irq = irq;
 633     sdram->nbanks = nbanks;
 634     memset(sdram->ram_bases, 0, 4 * sizeof(target_phys_addr_t));
 635     memcpy(sdram->ram_bases, ram_bases,
 636            nbanks * sizeof(target_phys_addr_t));
 637     memset(sdram->ram_sizes, 0, 4 * sizeof(target_phys_addr_t));
 638     memcpy(sdram->ram_sizes, ram_sizes,
 639            nbanks * sizeof(target_phys_addr_t));
 640     qemu_register_reset(&sdram_reset, sdram);
 641     ppc_dcr_register(env, SDRAM0_CFGADDR,
 642                      sdram, &dcr_read_sdram, &dcr_write_sdram);
 643     ppc_dcr_register(env, SDRAM0_CFGDATA,
 644                      sdram, &dcr_read_sdram, &dcr_write_sdram);
 645     if (do_init)
 646         sdram_map_bcr(sdram);
 647 }
 648
 649 /* Fill in consecutive SDRAM banks with 'ram_size' bytes of memory.
 650  *
 651  * sdram_bank_sizes[] must be 0-terminated.
 652  *
 653  * The 4xx SDRAM controller supports a small number of banks, and each bank
 654  * must be one of a small set of sizes. The number of banks and the supported
 655  * sizes varies by SoC. */
 656 ram_addr_t ppc4xx_sdram_adjust(ram_addr_t ram_size, int nr_banks,
 657                                target_phys_addr_t ram_bases[],
 658                                target_phys_addr_t ram_sizes[],
 659                                const unsigned int sdram_bank_sizes[])
 660 {
 661     ram_addr_t size_left = ram_size;
 662     int i;
 663     int j;
 664
 665     for (i = 0; i < nr_banks; i++) {
 666         for (j = 0; sdram_bank_sizes[j] != 0; j++) {
 667             unsigned int bank_size = sdram_bank_sizes[j];
 668
 669             if (bank_size <= size_left) {
 670                 char name[32];
 671                 snprintf(name, sizeof(name), "ppc4xx.sdram%d", i);
 672                 ram_bases[i] = qemu_ram_alloc(NULL, name, bank_size);
 673                 ram_sizes[i] = bank_size;
 674                 size_left -= bank_size;
 675                 break;
 676             }
 677         }
 678
 679         if (!size_left) {
 680             /* No need to use the remaining banks. */
 681             break;
 682         }
 683     }
 684
 685     ram_size -= size_left;
 686     if (size_left)
 687         printf("Truncating memory to %d MiB to fit SDRAM controller limits.\n",
 688                (int)(ram_size >> 20));
 689
 690     return ram_size;
 691 }