hw/m48t59.c

   1 /*
   2  * QEMU M48T59 and M48T08 NVRAM emulation for PPC PREP and Sparc platforms
   3  *
   4  * Copyright (c) 2003-2005, 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 "nvram.h"
  26 #include "qemu-timer.h"
  27 #include "sysemu.h"
  28 #include "sysbus.h"
  29 #include "isa.h"
  30
  31 //#define DEBUG_NVRAM
  32
  33 #if defined(DEBUG_NVRAM)
  34 #define NVRAM_PRINTF(fmt, ...) do { printf(fmt , ## __VA_ARGS__); } while (0)
  35 #else
  36 #define NVRAM_PRINTF(fmt, ...) do { } while (0)
  37 #endif
  38
  39 /*
  40  * The M48T02, M48T08 and M48T59 chips are very similar. The newer '59 has
  41  * alarm and a watchdog timer and related control registers. In the
  42  * PPC platform there is also a nvram lock function.
  43  */
  44
  45 /*
  46  * Chipset docs:
  47  * http://www.st.com/stonline/products/literature/ds/2410/m48t02.pdf
  48  * http://www.st.com/stonline/products/literature/ds/2411/m48t08.pdf
  49  * http://www.st.com/stonline/products/literature/od/7001/m48t59y.pdf
  50  */
  51
  52 struct M48t59State {
  53     /* Model parameters */
  54     uint32_t type; // 2 = m48t02, 8 = m48t08, 59 = m48t59
  55     /* Hardware parameters */
  56     qemu_irq IRQ;
  57     uint32_t io_base;
  58     uint32_t size;
  59     /* RTC management */
  60     time_t   time_offset;
  61     time_t   stop_time;
  62     /* Alarm & watchdog */
  63     struct tm alarm;
  64     struct QEMUTimer *alrm_timer;
  65     struct QEMUTimer *wd_timer;
  66     /* NVRAM storage */
  67     uint8_t  lock;
  68     uint16_t addr;
  69     uint8_t *buffer;
  70 };
  71
  72 typedef struct M48t59ISAState {
  73     ISADevice busdev;
  74     M48t59State state;
  75 } M48t59ISAState;
  76
  77 typedef struct M48t59SysBusState {
  78     SysBusDevice busdev;
  79     M48t59State state;
  80 } M48t59SysBusState;
  81
  82 /* Fake timer functions */
  83
  84 /* Alarm management */
  85 static void alarm_cb (void *opaque)
  86 {
  87     struct tm tm;
  88     uint64_t next_time;
  89     M48t59State *NVRAM = opaque;
  90
  91     qemu_set_irq(NVRAM->IRQ, 1);
  92     if ((NVRAM->buffer[0x1FF5] & 0x80) == 0 &&
  93         (NVRAM->buffer[0x1FF4] & 0x80) == 0 &&
  94         (NVRAM->buffer[0x1FF3] & 0x80) == 0 &&
  95         (NVRAM->buffer[0x1FF2] & 0x80) == 0) {
  96         /* Repeat once a month */
  97         qemu_get_timedate(&tm, NVRAM->time_offset);
  98         tm.tm_mon++;
  99         if (tm.tm_mon == 13) {
 100             tm.tm_mon = 1;
 101             tm.tm_year++;
 102         }
 103         next_time = qemu_timedate_diff(&tm) - NVRAM->time_offset;
 104     } else if ((NVRAM->buffer[0x1FF5] & 0x80) != 0 &&
 105                (NVRAM->buffer[0x1FF4] & 0x80) == 0 &&
 106                (NVRAM->buffer[0x1FF3] & 0x80) == 0 &&
 107                (NVRAM->buffer[0x1FF2] & 0x80) == 0) {
 108         /* Repeat once a day */
 109         next_time = 24 * 60 * 60;
 110     } else if ((NVRAM->buffer[0x1FF5] & 0x80) != 0 &&
 111                (NVRAM->buffer[0x1FF4] & 0x80) != 0 &&
 112                (NVRAM->buffer[0x1FF3] & 0x80) == 0 &&
 113                (NVRAM->buffer[0x1FF2] & 0x80) == 0) {
 114         /* Repeat once an hour */
 115         next_time = 60 * 60;
 116     } else if ((NVRAM->buffer[0x1FF5] & 0x80) != 0 &&
 117                (NVRAM->buffer[0x1FF4] & 0x80) != 0 &&
 118                (NVRAM->buffer[0x1FF3] & 0x80) != 0 &&
 119                (NVRAM->buffer[0x1FF2] & 0x80) == 0) {
 120         /* Repeat once a minute */
 121         next_time = 60;
 122     } else {
 123         /* Repeat once a second */
 124         next_time = 1;
 125     }
 126     qemu_mod_timer(NVRAM->alrm_timer, qemu_get_clock(vm_clock) +
 127                     next_time * 1000);
 128     qemu_set_irq(NVRAM->IRQ, 0);
 129 }
 130
 131 static void set_alarm(M48t59State *NVRAM)
 132 {
 133     int diff;
 134     if (NVRAM->alrm_timer != NULL) {
 135         qemu_del_timer(NVRAM->alrm_timer);
 136         diff = qemu_timedate_diff(&NVRAM->alarm) - NVRAM->time_offset;
 137         if (diff > 0)
 138             qemu_mod_timer(NVRAM->alrm_timer, diff * 1000);
 139     }
 140 }
 141
 142 /* RTC management helpers */
 143 static inline void get_time(M48t59State *NVRAM, struct tm *tm)
 144 {
 145     qemu_get_timedate(tm, NVRAM->time_offset);
 146 }
 147
 148 static void set_time(M48t59State *NVRAM, struct tm *tm)
 149 {
 150     NVRAM->time_offset = qemu_timedate_diff(tm);
 151     set_alarm(NVRAM);
 152 }
 153
 154 /* Watchdog management */
 155 static void watchdog_cb (void *opaque)
 156 {
 157     M48t59State *NVRAM = opaque;
 158
 159     NVRAM->buffer[0x1FF0] |= 0x80;
 160     if (NVRAM->buffer[0x1FF7] & 0x80) {
 161         NVRAM->buffer[0x1FF7] = 0x00;
 162         NVRAM->buffer[0x1FFC] &= ~0x40;
 163         /* May it be a hw CPU Reset instead ? */
 164         qemu_system_reset_request();
 165     } else {
 166         qemu_set_irq(NVRAM->IRQ, 1);
 167         qemu_set_irq(NVRAM->IRQ, 0);
 168     }
 169 }
 170
 171 static void set_up_watchdog(M48t59State *NVRAM, uint8_t value)
 172 {
 173     uint64_t interval; /* in 1/16 seconds */
 174
 175     NVRAM->buffer[0x1FF0] &= ~0x80;
 176     if (NVRAM->wd_timer != NULL) {
 177         qemu_del_timer(NVRAM->wd_timer);
 178         if (value != 0) {
 179             interval = (1 << (2 * (value & 0x03))) * ((value >> 2) & 0x1F);
 180             qemu_mod_timer(NVRAM->wd_timer, ((uint64_t)time(NULL) * 1000) +
 181                            ((interval * 1000) >> 4));
 182         }
 183     }
 184 }
 185
 186 /* Direct access to NVRAM */
 187 void m48t59_write (void *opaque, uint32_t addr, uint32_t val)
 188 {
 189     M48t59State *NVRAM = opaque;
 190     struct tm tm;
 191     int tmp;
 192
 193     if (addr > 0x1FF8 && addr < 0x2000)
 194         NVRAM_PRINTF("%s: 0x%08x => 0x%08x\n", __func__, addr, val);
 195
 196     /* check for NVRAM access */
 197     if ((NVRAM->type == 2 && addr < 0x7f8) ||
 198         (NVRAM->type == 8 && addr < 0x1ff8) ||
 199         (NVRAM->type == 59 && addr < 0x1ff0))
 200         goto do_write;
 201
 202     /* TOD access */
 203     switch (addr) {
 204     case 0x1FF0:
 205         /* flags register : read-only */
 206         break;
 207     case 0x1FF1:
 208         /* unused */
 209         break;
 210     case 0x1FF2:
 211         /* alarm seconds */
 212         tmp = from_bcd(val & 0x7F);
 213         if (tmp >= 0 && tmp <= 59) {
 214             NVRAM->alarm.tm_sec = tmp;
 215             NVRAM->buffer[0x1FF2] = val;
 216             set_alarm(NVRAM);
 217         }
 218         break;
 219     case 0x1FF3:
 220         /* alarm minutes */
 221         tmp = from_bcd(val & 0x7F);
 222         if (tmp >= 0 && tmp <= 59) {
 223             NVRAM->alarm.tm_min = tmp;
 224             NVRAM->buffer[0x1FF3] = val;
 225             set_alarm(NVRAM);
 226         }
 227         break;
 228     case 0x1FF4:
 229         /* alarm hours */
 230         tmp = from_bcd(val & 0x3F);
 231         if (tmp >= 0 && tmp <= 23) {
 232             NVRAM->alarm.tm_hour = tmp;
 233             NVRAM->buffer[0x1FF4] = val;
 234             set_alarm(NVRAM);
 235         }
 236         break;
 237     case 0x1FF5:
 238         /* alarm date */
 239         tmp = from_bcd(val & 0x1F);
 240         if (tmp != 0) {
 241             NVRAM->alarm.tm_mday = tmp;
 242             NVRAM->buffer[0x1FF5] = val;
 243             set_alarm(NVRAM);
 244         }
 245         break;
 246     case 0x1FF6:
 247         /* interrupts */
 248         NVRAM->buffer[0x1FF6] = val;
 249         break;
 250     case 0x1FF7:
 251         /* watchdog */
 252         NVRAM->buffer[0x1FF7] = val;
 253         set_up_watchdog(NVRAM, val);
 254         break;
 255     case 0x1FF8:
 256     case 0x07F8:
 257         /* control */
 258        NVRAM->buffer[addr] = (val & ~0xA0) | 0x90;
 259         break;
 260     case 0x1FF9:
 261     case 0x07F9:
 262         /* seconds (BCD) */
 263         tmp = from_bcd(val & 0x7F);
 264         if (tmp >= 0 && tmp <= 59) {
 265             get_time(NVRAM, &tm);
 266             tm.tm_sec = tmp;
 267             set_time(NVRAM, &tm);
 268         }
 269         if ((val & 0x80) ^ (NVRAM->buffer[addr] & 0x80)) {
 270             if (val & 0x80) {
 271                 NVRAM->stop_time = time(NULL);
 272             } else {
 273                 NVRAM->time_offset += NVRAM->stop_time - time(NULL);
 274                 NVRAM->stop_time = 0;
 275             }
 276         }
 277         NVRAM->buffer[addr] = val & 0x80;
 278         break;
 279     case 0x1FFA:
 280     case 0x07FA:
 281         /* minutes (BCD) */
 282         tmp = from_bcd(val & 0x7F);
 283         if (tmp >= 0 && tmp <= 59) {
 284             get_time(NVRAM, &tm);
 285             tm.tm_min = tmp;
 286             set_time(NVRAM, &tm);
 287         }
 288         break;
 289     case 0x1FFB:
 290     case 0x07FB:
 291         /* hours (BCD) */
 292         tmp = from_bcd(val & 0x3F);
 293         if (tmp >= 0 && tmp <= 23) {
 294             get_time(NVRAM, &tm);
 295             tm.tm_hour = tmp;
 296             set_time(NVRAM, &tm);
 297         }
 298         break;
 299     case 0x1FFC:
 300     case 0x07FC:
 301         /* day of the week / century */
 302         tmp = from_bcd(val & 0x07);
 303         get_time(NVRAM, &tm);
 304         tm.tm_wday = tmp;
 305         set_time(NVRAM, &tm);
 306         NVRAM->buffer[addr] = val & 0x40;
 307         break;
 308     case 0x1FFD:
 309     case 0x07FD:
 310         /* date */
 311         tmp = from_bcd(val & 0x1F);
 312         if (tmp != 0) {
 313             get_time(NVRAM, &tm);
 314             tm.tm_mday = tmp;
 315             set_time(NVRAM, &tm);
 316         }
 317         break;
 318     case 0x1FFE:
 319     case 0x07FE:
 320         /* month */
 321         tmp = from_bcd(val & 0x1F);
 322         if (tmp >= 1 && tmp <= 12) {
 323             get_time(NVRAM, &tm);
 324             tm.tm_mon = tmp - 1;
 325             set_time(NVRAM, &tm);
 326         }
 327         break;
 328     case 0x1FFF:
 329     case 0x07FF:
 330         /* year */
 331         tmp = from_bcd(val);
 332         if (tmp >= 0 && tmp <= 99) {
 333             get_time(NVRAM, &tm);
 334             if (NVRAM->type == 8)
 335                 tm.tm_year = from_bcd(val) + 68; // Base year is 1968
 336             else
 337                 tm.tm_year = from_bcd(val);
 338             set_time(NVRAM, &tm);
 339         }
 340         break;
 341     default:
 342         /* Check lock registers state */
 343         if (addr >= 0x20 && addr <= 0x2F && (NVRAM->lock & 1))
 344             break;
 345         if (addr >= 0x30 && addr <= 0x3F && (NVRAM->lock & 2))
 346             break;
 347     do_write:
 348         if (addr < NVRAM->size) {
 349             NVRAM->buffer[addr] = val & 0xFF;
 350         }
 351         break;
 352     }
 353 }
 354
 355 uint32_t m48t59_read (void *opaque, uint32_t addr)
 356 {
 357     M48t59State *NVRAM = opaque;
 358     struct tm tm;
 359     uint32_t retval = 0xFF;
 360
 361     /* check for NVRAM access */
 362     if ((NVRAM->type == 2 && addr < 0x078f) ||
 363         (NVRAM->type == 8 && addr < 0x1ff8) ||
 364         (NVRAM->type == 59 && addr < 0x1ff0))
 365         goto do_read;
 366
 367     /* TOD access */
 368     switch (addr) {
 369     case 0x1FF0:
 370         /* flags register */
 371         goto do_read;
 372     case 0x1FF1:
 373         /* unused */
 374         retval = 0;
 375         break;
 376     case 0x1FF2:
 377         /* alarm seconds */
 378         goto do_read;
 379     case 0x1FF3:
 380         /* alarm minutes */
 381         goto do_read;
 382     case 0x1FF4:
 383         /* alarm hours */
 384         goto do_read;
 385     case 0x1FF5:
 386         /* alarm date */
 387         goto do_read;
 388     case 0x1FF6:
 389         /* interrupts */
 390         goto do_read;
 391     case 0x1FF7:
 392         /* A read resets the watchdog */
 393         set_up_watchdog(NVRAM, NVRAM->buffer[0x1FF7]);
 394         goto do_read;
 395     case 0x1FF8:
 396     case 0x07F8:
 397         /* control */
 398         goto do_read;
 399     case 0x1FF9:
 400     case 0x07F9:
 401         /* seconds (BCD) */
 402         get_time(NVRAM, &tm);
 403         retval = (NVRAM->buffer[addr] & 0x80) | to_bcd(tm.tm_sec);
 404         break;
 405     case 0x1FFA:
 406     case 0x07FA:
 407         /* minutes (BCD) */
 408         get_time(NVRAM, &tm);
 409         retval = to_bcd(tm.tm_min);
 410         break;
 411     case 0x1FFB:
 412     case 0x07FB:
 413         /* hours (BCD) */
 414         get_time(NVRAM, &tm);
 415         retval = to_bcd(tm.tm_hour);
 416         break;
 417     case 0x1FFC:
 418     case 0x07FC:
 419         /* day of the week / century */
 420         get_time(NVRAM, &tm);
 421         retval = NVRAM->buffer[addr] | tm.tm_wday;
 422         break;
 423     case 0x1FFD:
 424     case 0x07FD:
 425         /* date */
 426         get_time(NVRAM, &tm);
 427         retval = to_bcd(tm.tm_mday);
 428         break;
 429     case 0x1FFE:
 430     case 0x07FE:
 431         /* month */
 432         get_time(NVRAM, &tm);
 433         retval = to_bcd(tm.tm_mon + 1);
 434         break;
 435     case 0x1FFF:
 436     case 0x07FF:
 437         /* year */
 438         get_time(NVRAM, &tm);
 439         if (NVRAM->type == 8)
 440             retval = to_bcd(tm.tm_year - 68); // Base year is 1968
 441         else
 442             retval = to_bcd(tm.tm_year);
 443         break;
 444     default:
 445         /* Check lock registers state */
 446         if (addr >= 0x20 && addr <= 0x2F && (NVRAM->lock & 1))
 447             break;
 448         if (addr >= 0x30 && addr <= 0x3F && (NVRAM->lock & 2))
 449             break;
 450     do_read:
 451         if (addr < NVRAM->size) {
 452             retval = NVRAM->buffer[addr];
 453         }
 454         break;
 455     }
 456     if (addr > 0x1FF9 && addr < 0x2000)
 457        NVRAM_PRINTF("%s: 0x%08x <= 0x%08x\n", __func__, addr, retval);
 458
 459     return retval;
 460 }
 461
 462 void m48t59_set_addr (void *opaque, uint32_t addr)
 463 {
 464     M48t59State *NVRAM = opaque;
 465
 466     NVRAM->addr = addr;
 467 }
 468
 469 void m48t59_toggle_lock (void *opaque, int lock)
 470 {
 471     M48t59State *NVRAM = opaque;
 472
 473     NVRAM->lock ^= 1 << lock;
 474 }
 475
 476 /* IO access to NVRAM */
 477 static void NVRAM_writeb (void *opaque, uint32_t addr, uint32_t val)
 478 {
 479     M48t59State *NVRAM = opaque;
 480
 481     addr -= NVRAM->io_base;
 482     NVRAM_PRINTF("%s: 0x%08x => 0x%08x\n", __func__, addr, val);
 483     switch (addr) {
 484     case 0:
 485         NVRAM->addr &= ~0x00FF;
 486         NVRAM->addr |= val;
 487         break;
 488     case 1:
 489         NVRAM->addr &= ~0xFF00;
 490         NVRAM->addr |= val << 8;
 491         break;
 492     case 3:
 493         m48t59_write(NVRAM, val, NVRAM->addr);
 494         NVRAM->addr = 0x0000;
 495         break;
 496     default:
 497         break;
 498     }
 499 }
 500
 501 static uint32_t NVRAM_readb (void *opaque, uint32_t addr)
 502 {
 503     M48t59State *NVRAM = opaque;
 504     uint32_t retval;
 505
 506     addr -= NVRAM->io_base;
 507     switch (addr) {
 508     case 3:
 509         retval = m48t59_read(NVRAM, NVRAM->addr);
 510         break;
 511     default:
 512         retval = -1;
 513         break;
 514     }
 515     NVRAM_PRINTF("%s: 0x%08x <= 0x%08x\n", __func__, addr, retval);
 516
 517     return retval;
 518 }
 519
 520 static void nvram_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
 521 {
 522     M48t59State *NVRAM = opaque;
 523
 524     m48t59_write(NVRAM, addr, value & 0xff);
 525 }
 526
 527 static void nvram_writew (void *opaque, target_phys_addr_t addr, uint32_t value)
 528 {
 529     M48t59State *NVRAM = opaque;
 530
 531     m48t59_write(NVRAM, addr, (value >> 8) & 0xff);
 532     m48t59_write(NVRAM, addr + 1, value & 0xff);
 533 }
 534
 535 static void nvram_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
 536 {
 537     M48t59State *NVRAM = opaque;
 538
 539     m48t59_write(NVRAM, addr, (value >> 24) & 0xff);
 540     m48t59_write(NVRAM, addr + 1, (value >> 16) & 0xff);
 541     m48t59_write(NVRAM, addr + 2, (value >> 8) & 0xff);
 542     m48t59_write(NVRAM, addr + 3, value & 0xff);
 543 }
 544
 545 static uint32_t nvram_readb (void *opaque, target_phys_addr_t addr)
 546 {
 547     M48t59State *NVRAM = opaque;
 548     uint32_t retval;
 549
 550     retval = m48t59_read(NVRAM, addr);
 551     return retval;
 552 }
 553
 554 static uint32_t nvram_readw (void *opaque, target_phys_addr_t addr)
 555 {
 556     M48t59State *NVRAM = opaque;
 557     uint32_t retval;
 558
 559     retval = m48t59_read(NVRAM, addr) << 8;
 560     retval |= m48t59_read(NVRAM, addr + 1);
 561     return retval;
 562 }
 563
 564 static uint32_t nvram_readl (void *opaque, target_phys_addr_t addr)
 565 {
 566     M48t59State *NVRAM = opaque;
 567     uint32_t retval;
 568
 569     retval = m48t59_read(NVRAM, addr) << 24;
 570     retval |= m48t59_read(NVRAM, addr + 1) << 16;
 571     retval |= m48t59_read(NVRAM, addr + 2) << 8;
 572     retval |= m48t59_read(NVRAM, addr + 3);
 573     return retval;
 574 }
 575
 576 static CPUWriteMemoryFunc * const nvram_write[] = {
 577     &nvram_writeb,
 578     &nvram_writew,
 579     &nvram_writel,
 580 };
 581
 582 static CPUReadMemoryFunc * const nvram_read[] = {
 583     &nvram_readb,
 584     &nvram_readw,
 585     &nvram_readl,
 586 };
 587
 588 static void m48t59_save(QEMUFile *f, void *opaque)
 589 {
 590     M48t59State *s = opaque;
 591
 592     qemu_put_8s(f, &s->lock);
 593     qemu_put_be16s(f, &s->addr);
 594     qemu_put_buffer(f, s->buffer, s->size);
 595 }
 596
 597 static int m48t59_load(QEMUFile *f, void *opaque, int version_id)
 598 {
 599     M48t59State *s = opaque;
 600
 601     if (version_id != 1)
 602         return -EINVAL;
 603
 604     qemu_get_8s(f, &s->lock);
 605     qemu_get_be16s(f, &s->addr);
 606     qemu_get_buffer(f, s->buffer, s->size);
 607
 608     return 0;
 609 }
 610
 611 static void m48t59_reset_common(M48t59State *NVRAM)
 612 {
 613     NVRAM->addr = 0;
 614     NVRAM->lock = 0;
 615     if (NVRAM->alrm_timer != NULL)
 616         qemu_del_timer(NVRAM->alrm_timer);
 617
 618     if (NVRAM->wd_timer != NULL)
 619         qemu_del_timer(NVRAM->wd_timer);
 620 }
 621
 622 static void m48t59_reset_isa(DeviceState *d)
 623 {
 624     M48t59ISAState *isa = container_of(d, M48t59ISAState, busdev.qdev);
 625     M48t59State *NVRAM = &isa->state;
 626
 627     m48t59_reset_common(NVRAM);
 628 }
 629
 630 static void m48t59_reset_sysbus(DeviceState *d)
 631 {
 632     M48t59SysBusState *sys = container_of(d, M48t59SysBusState, busdev.qdev);
 633     M48t59State *NVRAM = &sys->state;
 634
 635     m48t59_reset_common(NVRAM);
 636 }
 637
 638 /* Initialisation routine */
 639 M48t59State *m48t59_init(qemu_irq IRQ, target_phys_addr_t mem_base,
 640                          uint32_t io_base, uint16_t size, int type)
 641 {
 642     DeviceState *dev;
 643     SysBusDevice *s;
 644     M48t59SysBusState *d;
 645
 646     dev = qdev_create(NULL, "m48t59");
 647     qdev_prop_set_uint32(dev, "type", type);
 648     qdev_prop_set_uint32(dev, "size", size);
 649     qdev_prop_set_uint32(dev, "io_base", io_base);
 650     qdev_init_nofail(dev);
 651     s = sysbus_from_qdev(dev);
 652     sysbus_connect_irq(s, 0, IRQ);
 653     if (io_base != 0) {
 654         register_ioport_read(io_base, 0x04, 1, NVRAM_readb, s);
 655         register_ioport_write(io_base, 0x04, 1, NVRAM_writeb, s);
 656     }
 657     if (mem_base != 0) {
 658         sysbus_mmio_map(s, 0, mem_base);
 659     }
 660
 661     d = FROM_SYSBUS(M48t59SysBusState, s);
 662
 663     return &d->state;
 664 }
 665
 666 M48t59State *m48t59_init_isa(uint32_t io_base, uint16_t size, int type)
 667 {
 668     M48t59ISAState *d;
 669     ISADevice *dev;
 670     M48t59State *s;
 671
 672     dev = isa_create("m48t59_isa");
 673     qdev_prop_set_uint32(&dev->qdev, "type", type);
 674     qdev_prop_set_uint32(&dev->qdev, "size", size);
 675     qdev_prop_set_uint32(&dev->qdev, "io_base", io_base);
 676     qdev_init_nofail(&dev->qdev);
 677     d = DO_UPCAST(M48t59ISAState, busdev, dev);
 678     s = &d->state;
 679
 680     if (io_base != 0) {
 681         register_ioport_read(io_base, 0x04, 1, NVRAM_readb, s);
 682         register_ioport_write(io_base, 0x04, 1, NVRAM_writeb, s);
 683         isa_init_ioport_range(dev, io_base, 4);
 684     }
 685
 686     return s;
 687 }
 688
 689 static void m48t59_init_common(M48t59State *s)
 690 {
 691     s->buffer = qemu_mallocz(s->size);
 692     if (s->type == 59) {
 693         s->alrm_timer = qemu_new_timer(vm_clock, &alarm_cb, s);
 694         s->wd_timer = qemu_new_timer(vm_clock, &watchdog_cb, s);
 695     }
 696     qemu_get_timedate(&s->alarm, 0);
 697
 698     register_savevm(NULL, "m48t59", -1, 1, m48t59_save, m48t59_load, s);
 699 }
 700
 701 static int m48t59_init_isa1(ISADevice *dev)
 702 {
 703     M48t59ISAState *d = DO_UPCAST(M48t59ISAState, busdev, dev);
 704     M48t59State *s = &d->state;
 705
 706     isa_init_irq(dev, &s->IRQ, 8);
 707     m48t59_init_common(s);
 708
 709     return 0;
 710 }
 711
 712 static int m48t59_init1(SysBusDevice *dev)
 713 {
 714     M48t59SysBusState *d = FROM_SYSBUS(M48t59SysBusState, dev);
 715     M48t59State *s = &d->state;
 716     int mem_index;
 717
 718     sysbus_init_irq(dev, &s->IRQ);
 719
 720     mem_index = cpu_register_io_memory(nvram_read, nvram_write, s,
 721                                        DEVICE_NATIVE_ENDIAN);
 722     sysbus_init_mmio(dev, s->size, mem_index);
 723     m48t59_init_common(s);
 724
 725     return 0;
 726 }
 727
 728 static ISADeviceInfo m48t59_isa_info = {
 729     .init = m48t59_init_isa1,
 730     .qdev.name = "m48t59_isa",
 731     .qdev.size = sizeof(M48t59ISAState),
 732     .qdev.reset = m48t59_reset_isa,
 733     .qdev.no_user = 1,
 734     .qdev.props = (Property[]) {
 735         DEFINE_PROP_UINT32("size",    M48t59ISAState, state.size,    -1),
 736         DEFINE_PROP_UINT32("type",    M48t59ISAState, state.type,    -1),
 737         DEFINE_PROP_HEX32( "io_base", M48t59ISAState, state.io_base,  0),
 738         DEFINE_PROP_END_OF_LIST(),
 739     }
 740 };
 741
 742 static SysBusDeviceInfo m48t59_info = {
 743     .init = m48t59_init1,
 744     .qdev.name  = "m48t59",
 745     .qdev.size = sizeof(M48t59SysBusState),
 746     .qdev.reset = m48t59_reset_sysbus,
 747     .qdev.props = (Property[]) {
 748         DEFINE_PROP_UINT32("size",    M48t59SysBusState, state.size,    -1),
 749         DEFINE_PROP_UINT32("type",    M48t59SysBusState, state.type,    -1),
 750         DEFINE_PROP_HEX32( "io_base", M48t59SysBusState, state.io_base,  0),
 751         DEFINE_PROP_END_OF_LIST(),
 752     }
 753 };
 754
 755 static void m48t59_register_devices(void)
 756 {
 757     sysbus_register_withprop(&m48t59_info);
 758     isa_qdev_register(&m48t59_isa_info);
 759 }
 760
 761 device_init(m48t59_register_devices)