hw/rtc/m48t59.c

   1 /*
   2  * QEMU M48T59 and M48T08 NVRAM emulation for PPC PREP and Sparc platforms
   3  *
   4  * Copyright (c) 2003-2005, 2007, 2017 Jocelyn Mayer
   5  * Copyright (c) 2013 Hervé Poussineau
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25
  26 #include "qemu/osdep.h"
  27 #include "hw/irq.h"
  28 #include "hw/qdev-properties.h"
  29 #include "hw/rtc/m48t59.h"
  30 #include "qemu/timer.h"
  31 #include "sysemu/runstate.h"
  32 #include "sysemu/rtc.h"
  33 #include "sysemu/sysemu.h"
  34 #include "hw/sysbus.h"
  35 #include "qapi/error.h"
  36 #include "qemu/bcd.h"
  37 #include "qemu/module.h"
  38 #include "trace.h"
  39 #include "sysemu/watchdog.h"
  40
  41 #include "m48t59-internal.h"
  42 #include "migration/vmstate.h"
  43 #include "qom/object.h"
  44
  45 #define TYPE_M48TXX_SYS_BUS "sysbus-m48txx"
  46 typedef struct M48txxSysBusDeviceClass M48txxSysBusDeviceClass;
  47 typedef struct M48txxSysBusState M48txxSysBusState;
  48 DECLARE_OBJ_CHECKERS(M48txxSysBusState, M48txxSysBusDeviceClass,
  49                      M48TXX_SYS_BUS, TYPE_M48TXX_SYS_BUS)
  50
  51 /*
  52  * Chipset docs:
  53  * http://www.st.com/stonline/products/literature/ds/2410/m48t02.pdf
  54  * http://www.st.com/stonline/products/literature/ds/2411/m48t08.pdf
  55  * http://www.st.com/stonline/products/literature/od/7001/m48t59y.pdf
  56  */
  57
  58 struct M48txxSysBusState {
  59     SysBusDevice parent_obj;
  60     M48t59State state;
  61     MemoryRegion io;
  62 };
  63
  64 struct M48txxSysBusDeviceClass {
  65     SysBusDeviceClass parent_class;
  66     M48txxInfo info;
  67 };
  68
  69 static M48txxInfo m48txx_sysbus_info[] = {
  70     {
  71         .bus_name = "sysbus-m48t02",
  72         .model = 2,
  73         .size = 0x800,
  74     },{
  75         .bus_name = "sysbus-m48t08",
  76         .model = 8,
  77         .size = 0x2000,
  78     },{
  79         .bus_name = "sysbus-m48t59",
  80         .model = 59,
  81         .size = 0x2000,
  82     }
  83 };
  84
  85
  86 /* Fake timer functions */
  87
  88 /* Alarm management */
  89 static void alarm_cb (void *opaque)
  90 {
  91     struct tm tm;
  92     uint64_t next_time;
  93     M48t59State *NVRAM = opaque;
  94
  95     qemu_set_irq(NVRAM->IRQ, 1);
  96     if ((NVRAM->buffer[0x1FF5] & 0x80) == 0 &&
  97         (NVRAM->buffer[0x1FF4] & 0x80) == 0 &&
  98         (NVRAM->buffer[0x1FF3] & 0x80) == 0 &&
  99         (NVRAM->buffer[0x1FF2] & 0x80) == 0) {
 100         /* Repeat once a month */
 101         qemu_get_timedate(&tm, NVRAM->time_offset);
 102         tm.tm_mon++;
 103         if (tm.tm_mon == 13) {
 104             tm.tm_mon = 1;
 105             tm.tm_year++;
 106         }
 107         next_time = qemu_timedate_diff(&tm) - NVRAM->time_offset;
 108     } else if ((NVRAM->buffer[0x1FF5] & 0x80) != 0 &&
 109                (NVRAM->buffer[0x1FF4] & 0x80) == 0 &&
 110                (NVRAM->buffer[0x1FF3] & 0x80) == 0 &&
 111                (NVRAM->buffer[0x1FF2] & 0x80) == 0) {
 112         /* Repeat once a day */
 113         next_time = 24 * 60 * 60;
 114     } else if ((NVRAM->buffer[0x1FF5] & 0x80) != 0 &&
 115                (NVRAM->buffer[0x1FF4] & 0x80) != 0 &&
 116                (NVRAM->buffer[0x1FF3] & 0x80) == 0 &&
 117                (NVRAM->buffer[0x1FF2] & 0x80) == 0) {
 118         /* Repeat once an hour */
 119         next_time = 60 * 60;
 120     } else if ((NVRAM->buffer[0x1FF5] & 0x80) != 0 &&
 121                (NVRAM->buffer[0x1FF4] & 0x80) != 0 &&
 122                (NVRAM->buffer[0x1FF3] & 0x80) != 0 &&
 123                (NVRAM->buffer[0x1FF2] & 0x80) == 0) {
 124         /* Repeat once a minute */
 125         next_time = 60;
 126     } else {
 127         /* Repeat once a second */
 128         next_time = 1;
 129     }
 130     timer_mod(NVRAM->alrm_timer, qemu_clock_get_ns(rtc_clock) +
 131                     next_time * 1000);
 132     qemu_set_irq(NVRAM->IRQ, 0);
 133 }
 134
 135 static void set_alarm(M48t59State *NVRAM)
 136 {
 137     int64_t diff;
 138     if (NVRAM->alrm_timer != NULL) {
 139         timer_del(NVRAM->alrm_timer);
 140         diff = qemu_timedate_diff(&NVRAM->alarm) - NVRAM->time_offset;
 141         if (diff > 0)
 142             timer_mod(NVRAM->alrm_timer, diff * 1000);
 143     }
 144 }
 145
 146 /* RTC management helpers */
 147 static inline void get_time(M48t59State *NVRAM, struct tm *tm)
 148 {
 149     qemu_get_timedate(tm, NVRAM->time_offset);
 150 }
 151
 152 static void set_time(M48t59State *NVRAM, struct tm *tm)
 153 {
 154     NVRAM->time_offset = qemu_timedate_diff(tm);
 155     set_alarm(NVRAM);
 156 }
 157
 158 /* Watchdog management */
 159 static void watchdog_cb (void *opaque)
 160 {
 161     M48t59State *NVRAM = opaque;
 162
 163     NVRAM->buffer[0x1FF0] |= 0x80;
 164     if (NVRAM->buffer[0x1FF7] & 0x80) {
 165         NVRAM->buffer[0x1FF7] = 0x00;
 166         NVRAM->buffer[0x1FFC] &= ~0x40;
 167         watchdog_perform_action();
 168     } else {
 169         qemu_set_irq(NVRAM->IRQ, 1);
 170         qemu_set_irq(NVRAM->IRQ, 0);
 171     }
 172 }
 173
 174 static void set_up_watchdog(M48t59State *NVRAM, uint8_t value)
 175 {
 176     uint64_t interval; /* in 1/16 seconds */
 177
 178     NVRAM->buffer[0x1FF0] &= ~0x80;
 179     if (NVRAM->wd_timer != NULL) {
 180         timer_del(NVRAM->wd_timer);
 181         if (value != 0) {
 182             interval = (1 << (2 * (value & 0x03))) * ((value >> 2) & 0x1F);
 183             timer_mod(NVRAM->wd_timer, ((uint64_t)time(NULL) * 1000) +
 184                            ((interval * 1000) >> 4));
 185         }
 186     }
 187 }
 188
 189 /* Direct access to NVRAM */
 190 void m48t59_write(M48t59State *NVRAM, uint32_t addr, uint32_t val)
 191 {
 192     struct tm tm;
 193     int tmp;
 194
 195     trace_m48txx_nvram_mem_write(addr, val);
 196
 197     /* check for NVRAM access */
 198     if ((NVRAM->model == 2 && addr < 0x7f8) ||
 199         (NVRAM->model == 8 && addr < 0x1ff8) ||
 200         (NVRAM->model == 59 && addr < 0x1ff0)) {
 201         goto do_write;
 202     }
 203
 204     /* TOD access */
 205     switch (addr) {
 206     case 0x1FF0:
 207         /* flags register : read-only */
 208         break;
 209     case 0x1FF1:
 210         /* unused */
 211         break;
 212     case 0x1FF2:
 213         /* alarm seconds */
 214         tmp = from_bcd(val & 0x7F);
 215         if (tmp >= 0 && tmp <= 59) {
 216             NVRAM->alarm.tm_sec = tmp;
 217             NVRAM->buffer[0x1FF2] = val;
 218             set_alarm(NVRAM);
 219         }
 220         break;
 221     case 0x1FF3:
 222         /* alarm minutes */
 223         tmp = from_bcd(val & 0x7F);
 224         if (tmp >= 0 && tmp <= 59) {
 225             NVRAM->alarm.tm_min = tmp;
 226             NVRAM->buffer[0x1FF3] = val;
 227             set_alarm(NVRAM);
 228         }
 229         break;
 230     case 0x1FF4:
 231         /* alarm hours */
 232         tmp = from_bcd(val & 0x3F);
 233         if (tmp >= 0 && tmp <= 23) {
 234             NVRAM->alarm.tm_hour = tmp;
 235             NVRAM->buffer[0x1FF4] = val;
 236             set_alarm(NVRAM);
 237         }
 238         break;
 239     case 0x1FF5:
 240         /* alarm date */
 241         tmp = from_bcd(val & 0x3F);
 242         if (tmp != 0) {
 243             NVRAM->alarm.tm_mday = tmp;
 244             NVRAM->buffer[0x1FF5] = val;
 245             set_alarm(NVRAM);
 246         }
 247         break;
 248     case 0x1FF6:
 249         /* interrupts */
 250         NVRAM->buffer[0x1FF6] = val;
 251         break;
 252     case 0x1FF7:
 253         /* watchdog */
 254         NVRAM->buffer[0x1FF7] = val;
 255         set_up_watchdog(NVRAM, val);
 256         break;
 257     case 0x1FF8:
 258     case 0x07F8:
 259         /* control */
 260        NVRAM->buffer[addr] = (val & ~0xA0) | 0x90;
 261         break;
 262     case 0x1FF9:
 263     case 0x07F9:
 264         /* seconds (BCD) */
 265         tmp = from_bcd(val & 0x7F);
 266         if (tmp >= 0 && tmp <= 59) {
 267             get_time(NVRAM, &tm);
 268             tm.tm_sec = tmp;
 269             set_time(NVRAM, &tm);
 270         }
 271         if ((val & 0x80) ^ (NVRAM->buffer[addr] & 0x80)) {
 272             if (val & 0x80) {
 273                 NVRAM->stop_time = time(NULL);
 274             } else {
 275                 NVRAM->time_offset += NVRAM->stop_time - time(NULL);
 276                 NVRAM->stop_time = 0;
 277             }
 278         }
 279         NVRAM->buffer[addr] = val & 0x80;
 280         break;
 281     case 0x1FFA:
 282     case 0x07FA:
 283         /* minutes (BCD) */
 284         tmp = from_bcd(val & 0x7F);
 285         if (tmp >= 0 && tmp <= 59) {
 286             get_time(NVRAM, &tm);
 287             tm.tm_min = tmp;
 288             set_time(NVRAM, &tm);
 289         }
 290         break;
 291     case 0x1FFB:
 292     case 0x07FB:
 293         /* hours (BCD) */
 294         tmp = from_bcd(val & 0x3F);
 295         if (tmp >= 0 && tmp <= 23) {
 296             get_time(NVRAM, &tm);
 297             tm.tm_hour = tmp;
 298             set_time(NVRAM, &tm);
 299         }
 300         break;
 301     case 0x1FFC:
 302     case 0x07FC:
 303         /* day of the week / century */
 304         tmp = from_bcd(val & 0x07);
 305         get_time(NVRAM, &tm);
 306         tm.tm_wday = tmp;
 307         set_time(NVRAM, &tm);
 308         NVRAM->buffer[addr] = val & 0x40;
 309         break;
 310     case 0x1FFD:
 311     case 0x07FD:
 312         /* date (BCD) */
 313         tmp = from_bcd(val & 0x3F);
 314         if (tmp != 0) {
 315             get_time(NVRAM, &tm);
 316             tm.tm_mday = tmp;
 317             set_time(NVRAM, &tm);
 318         }
 319         break;
 320     case 0x1FFE:
 321     case 0x07FE:
 322         /* month */
 323         tmp = from_bcd(val & 0x1F);
 324         if (tmp >= 1 && tmp <= 12) {
 325             get_time(NVRAM, &tm);
 326             tm.tm_mon = tmp - 1;
 327             set_time(NVRAM, &tm);
 328         }
 329         break;
 330     case 0x1FFF:
 331     case 0x07FF:
 332         /* year */
 333         tmp = from_bcd(val);
 334         if (tmp >= 0 && tmp <= 99) {
 335             get_time(NVRAM, &tm);
 336             tm.tm_year = from_bcd(val) + NVRAM->base_year - 1900;
 337             set_time(NVRAM, &tm);
 338         }
 339         break;
 340     default:
 341         /* Check lock registers state */
 342         if (addr >= 0x20 && addr <= 0x2F && (NVRAM->lock & 1))
 343             break;
 344         if (addr >= 0x30 && addr <= 0x3F && (NVRAM->lock & 2))
 345             break;
 346     do_write:
 347         if (addr < NVRAM->size) {
 348             NVRAM->buffer[addr] = val & 0xFF;
 349         }
 350         break;
 351     }
 352 }
 353
 354 uint32_t m48t59_read(M48t59State *NVRAM, uint32_t addr)
 355 {
 356     struct tm tm;
 357     uint32_t retval = 0xFF;
 358
 359     /* check for NVRAM access */
 360     if ((NVRAM->model == 2 && addr < 0x078f) ||
 361         (NVRAM->model == 8 && addr < 0x1ff8) ||
 362         (NVRAM->model == 59 && addr < 0x1ff0)) {
 363         goto do_read;
 364     }
 365
 366     /* TOD access */
 367     switch (addr) {
 368     case 0x1FF0:
 369         /* flags register */
 370         goto do_read;
 371     case 0x1FF1:
 372         /* unused */
 373         retval = 0;
 374         break;
 375     case 0x1FF2:
 376         /* alarm seconds */
 377         goto do_read;
 378     case 0x1FF3:
 379         /* alarm minutes */
 380         goto do_read;
 381     case 0x1FF4:
 382         /* alarm hours */
 383         goto do_read;
 384     case 0x1FF5:
 385         /* alarm date */
 386         goto do_read;
 387     case 0x1FF6:
 388         /* interrupts */
 389         goto do_read;
 390     case 0x1FF7:
 391         /* A read resets the watchdog */
 392         set_up_watchdog(NVRAM, NVRAM->buffer[0x1FF7]);
 393         goto do_read;
 394     case 0x1FF8:
 395     case 0x07F8:
 396         /* control */
 397         goto do_read;
 398     case 0x1FF9:
 399     case 0x07F9:
 400         /* seconds (BCD) */
 401         get_time(NVRAM, &tm);
 402         retval = (NVRAM->buffer[addr] & 0x80) | to_bcd(tm.tm_sec);
 403         break;
 404     case 0x1FFA:
 405     case 0x07FA:
 406         /* minutes (BCD) */
 407         get_time(NVRAM, &tm);
 408         retval = to_bcd(tm.tm_min);
 409         break;
 410     case 0x1FFB:
 411     case 0x07FB:
 412         /* hours (BCD) */
 413         get_time(NVRAM, &tm);
 414         retval = to_bcd(tm.tm_hour);
 415         break;
 416     case 0x1FFC:
 417     case 0x07FC:
 418         /* day of the week / century */
 419         get_time(NVRAM, &tm);
 420         retval = NVRAM->buffer[addr] | tm.tm_wday;
 421         break;
 422     case 0x1FFD:
 423     case 0x07FD:
 424         /* date */
 425         get_time(NVRAM, &tm);
 426         retval = to_bcd(tm.tm_mday);
 427         break;
 428     case 0x1FFE:
 429     case 0x07FE:
 430         /* month */
 431         get_time(NVRAM, &tm);
 432         retval = to_bcd(tm.tm_mon + 1);
 433         break;
 434     case 0x1FFF:
 435     case 0x07FF:
 436         /* year */
 437         get_time(NVRAM, &tm);
 438         retval = to_bcd((tm.tm_year + 1900 - NVRAM->base_year) % 100);
 439         break;
 440     default:
 441         /* Check lock registers state */
 442         if (addr >= 0x20 && addr <= 0x2F && (NVRAM->lock & 1))
 443             break;
 444         if (addr >= 0x30 && addr <= 0x3F && (NVRAM->lock & 2))
 445             break;
 446     do_read:
 447         if (addr < NVRAM->size) {
 448             retval = NVRAM->buffer[addr];
 449         }
 450         break;
 451     }
 452     trace_m48txx_nvram_mem_read(addr, retval);
 453
 454     return retval;
 455 }
 456
 457 /* IO access to NVRAM */
 458 static void NVRAM_writeb(void *opaque, hwaddr addr, uint64_t val,
 459                          unsigned size)
 460 {
 461     M48t59State *NVRAM = opaque;
 462
 463     trace_m48txx_nvram_io_write(addr, val);
 464     switch (addr) {
 465     case 0:
 466         NVRAM->addr &= ~0x00FF;
 467         NVRAM->addr |= val;
 468         break;
 469     case 1:
 470         NVRAM->addr &= ~0xFF00;
 471         NVRAM->addr |= val << 8;
 472         break;
 473     case 3:
 474         m48t59_write(NVRAM, NVRAM->addr, val);
 475         NVRAM->addr = 0x0000;
 476         break;
 477     default:
 478         break;
 479     }
 480 }
 481
 482 static uint64_t NVRAM_readb(void *opaque, hwaddr addr, unsigned size)
 483 {
 484     M48t59State *NVRAM = opaque;
 485     uint32_t retval;
 486
 487     switch (addr) {
 488     case 3:
 489         retval = m48t59_read(NVRAM, NVRAM->addr);
 490         break;
 491     default:
 492         retval = -1;
 493         break;
 494     }
 495     trace_m48txx_nvram_io_read(addr, retval);
 496
 497     return retval;
 498 }
 499
 500 static uint64_t nvram_read(void *opaque, hwaddr addr, unsigned size)
 501 {
 502     M48t59State *NVRAM = opaque;
 503
 504     return m48t59_read(NVRAM, addr);
 505 }
 506
 507 static void nvram_write(void *opaque, hwaddr addr, uint64_t value,
 508                         unsigned size)
 509 {
 510     M48t59State *NVRAM = opaque;
 511
 512     return m48t59_write(NVRAM, addr, value);
 513 }
 514
 515 static const MemoryRegionOps nvram_ops = {
 516     .read = nvram_read,
 517     .write = nvram_write,
 518     .impl.min_access_size = 1,
 519     .impl.max_access_size = 1,
 520     .valid.min_access_size = 1,
 521     .valid.max_access_size = 4,
 522     .endianness = DEVICE_BIG_ENDIAN,
 523 };
 524
 525 static const VMStateDescription vmstate_m48t59 = {
 526     .name = "m48t59",
 527     .version_id = 1,
 528     .minimum_version_id = 1,
 529     .fields = (const VMStateField[]) {
 530         VMSTATE_UINT8(lock, M48t59State),
 531         VMSTATE_UINT16(addr, M48t59State),
 532         VMSTATE_VBUFFER_UINT32(buffer, M48t59State, 0, NULL, size),
 533         VMSTATE_END_OF_LIST()
 534     }
 535 };
 536
 537 void m48t59_reset_common(M48t59State *NVRAM)
 538 {
 539     NVRAM->addr = 0;
 540     NVRAM->lock = 0;
 541     if (NVRAM->alrm_timer != NULL)
 542         timer_del(NVRAM->alrm_timer);
 543
 544     if (NVRAM->wd_timer != NULL)
 545         timer_del(NVRAM->wd_timer);
 546 }
 547
 548 static void m48t59_reset_sysbus(DeviceState *d)
 549 {
 550     M48txxSysBusState *sys = M48TXX_SYS_BUS(d);
 551     M48t59State *NVRAM = &sys->state;
 552
 553     m48t59_reset_common(NVRAM);
 554 }
 555
 556 const MemoryRegionOps m48t59_io_ops = {
 557     .read = NVRAM_readb,
 558     .write = NVRAM_writeb,
 559     .impl = {
 560         .min_access_size = 1,
 561         .max_access_size = 1,
 562     },
 563     .endianness = DEVICE_LITTLE_ENDIAN,
 564 };
 565
 566 void m48t59_realize_common(M48t59State *s, Error **errp)
 567 {
 568     s->buffer = g_malloc0(s->size);
 569     if (s->model == 59) {
 570         s->alrm_timer = timer_new_ns(rtc_clock, &alarm_cb, s);
 571         s->wd_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, &watchdog_cb, s);
 572     }
 573     qemu_get_timedate(&s->alarm, 0);
 574 }
 575
 576 static void m48t59_init1(Object *obj)
 577 {
 578     M48txxSysBusDeviceClass *u = M48TXX_SYS_BUS_GET_CLASS(obj);
 579     M48txxSysBusState *d = M48TXX_SYS_BUS(obj);
 580     SysBusDevice *dev = SYS_BUS_DEVICE(obj);
 581     M48t59State *s = &d->state;
 582
 583     s->model = u->info.model;
 584     s->size = u->info.size;
 585     sysbus_init_irq(dev, &s->IRQ);
 586
 587     memory_region_init_io(&s->iomem, obj, &nvram_ops, s, "m48t59.nvram",
 588                           s->size);
 589     memory_region_init_io(&d->io, obj, &m48t59_io_ops, s, "m48t59", 4);
 590 }
 591
 592 static void m48t59_realize(DeviceState *dev, Error **errp)
 593 {
 594     M48txxSysBusState *d = M48TXX_SYS_BUS(dev);
 595     M48t59State *s = &d->state;
 596     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 597
 598     sysbus_init_mmio(sbd, &s->iomem);
 599     sysbus_init_mmio(sbd, &d->io);
 600     m48t59_realize_common(s, errp);
 601 }
 602
 603 static uint32_t m48txx_sysbus_read(Nvram *obj, uint32_t addr)
 604 {
 605     M48txxSysBusState *d = M48TXX_SYS_BUS(obj);
 606     return m48t59_read(&d->state, addr);
 607 }
 608
 609 static void m48txx_sysbus_write(Nvram *obj, uint32_t addr, uint32_t val)
 610 {
 611     M48txxSysBusState *d = M48TXX_SYS_BUS(obj);
 612     m48t59_write(&d->state, addr, val);
 613 }
 614
 615 static void m48txx_sysbus_toggle_lock(Nvram *obj, int lock)
 616 {
 617     M48txxSysBusState *d = M48TXX_SYS_BUS(obj);
 618     m48t59_toggle_lock(&d->state, lock);
 619 }
 620
 621 static Property m48t59_sysbus_properties[] = {
 622     DEFINE_PROP_INT32("base-year", M48txxSysBusState, state.base_year, 0),
 623     DEFINE_PROP_END_OF_LIST(),
 624 };
 625
 626 static void m48txx_sysbus_class_init(ObjectClass *klass, void *data)
 627 {
 628     DeviceClass *dc = DEVICE_CLASS(klass);
 629     NvramClass *nc = NVRAM_CLASS(klass);
 630
 631     dc->realize = m48t59_realize;
 632     device_class_set_legacy_reset(dc, m48t59_reset_sysbus);
 633     device_class_set_props(dc, m48t59_sysbus_properties);
 634     dc->vmsd = &vmstate_m48t59;
 635     nc->read = m48txx_sysbus_read;
 636     nc->write = m48txx_sysbus_write;
 637     nc->toggle_lock = m48txx_sysbus_toggle_lock;
 638 }
 639
 640 static void m48txx_sysbus_concrete_class_init(ObjectClass *klass, void *data)
 641 {
 642     M48txxSysBusDeviceClass *u = M48TXX_SYS_BUS_CLASS(klass);
 643     M48txxInfo *info = data;
 644
 645     u->info = *info;
 646 }
 647
 648 static const TypeInfo nvram_info = {
 649     .name = TYPE_NVRAM,
 650     .parent = TYPE_INTERFACE,
 651     .class_size = sizeof(NvramClass),
 652 };
 653
 654 static const TypeInfo m48txx_sysbus_type_info = {
 655     .name = TYPE_M48TXX_SYS_BUS,
 656     .parent = TYPE_SYS_BUS_DEVICE,
 657     .instance_size = sizeof(M48txxSysBusState),
 658     .instance_init = m48t59_init1,
 659     .abstract = true,
 660     .class_init = m48txx_sysbus_class_init,
 661     .interfaces = (InterfaceInfo[]) {
 662         { TYPE_NVRAM },
 663         { }
 664     }
 665 };
 666
 667 static void m48t59_register_types(void)
 668 {
 669     TypeInfo sysbus_type_info = {
 670         .parent = TYPE_M48TXX_SYS_BUS,
 671         .class_size = sizeof(M48txxSysBusDeviceClass),
 672         .class_init = m48txx_sysbus_concrete_class_init,
 673     };
 674     int i;
 675
 676     type_register_static(&nvram_info);
 677     type_register_static(&m48txx_sysbus_type_info);
 678
 679     for (i = 0; i < ARRAY_SIZE(m48txx_sysbus_info); i++) {
 680         sysbus_type_info.name = m48txx_sysbus_info[i].bus_name;
 681         sysbus_type_info.class_data = &m48txx_sysbus_info[i];
 682         type_register(&sysbus_type_info);
 683     }
 684 }
 685
 686 type_init(m48t59_register_types)