hw/timer/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 "qemu-common.h"
  28 #include "hw/irq.h"
  29 #include "hw/qdev-properties.h"
  30 #include "hw/timer/m48t59.h"
  31 #include "qemu/timer.h"
  32 #include "sysemu/runstate.h"
  33 #include "sysemu/sysemu.h"
  34 #include "hw/sysbus.h"
  35 #include "exec/address-spaces.h"
  36 #include "qemu/bcd.h"
  37 #include "qemu/module.h"
  38
  39 #include "m48t59-internal.h"
  40 #include "migration/vmstate.h"
  41
  42 #define TYPE_M48TXX_SYS_BUS "sysbus-m48txx"
  43 #define M48TXX_SYS_BUS_GET_CLASS(obj) \
  44     OBJECT_GET_CLASS(M48txxSysBusDeviceClass, (obj), TYPE_M48TXX_SYS_BUS)
  45 #define M48TXX_SYS_BUS_CLASS(klass) \
  46     OBJECT_CLASS_CHECK(M48txxSysBusDeviceClass, (klass), TYPE_M48TXX_SYS_BUS)
  47 #define M48TXX_SYS_BUS(obj) \
  48     OBJECT_CHECK(M48txxSysBusState, (obj), TYPE_M48TXX_SYS_BUS)
  49
  50 /*
  51  * Chipset docs:
  52  * http://www.st.com/stonline/products/literature/ds/2410/m48t02.pdf
  53  * http://www.st.com/stonline/products/literature/ds/2411/m48t08.pdf
  54  * http://www.st.com/stonline/products/literature/od/7001/m48t59y.pdf
  55  */
  56
  57 typedef struct M48txxSysBusState {
  58     SysBusDevice parent_obj;
  59     M48t59State state;
  60     MemoryRegion io;
  61 } M48txxSysBusState;
  62
  63 typedef struct M48txxSysBusDeviceClass {
  64     SysBusDeviceClass parent_class;
  65     M48txxInfo info;
  66 } M48txxSysBusDeviceClass;
  67
  68 static M48txxInfo m48txx_sysbus_info[] = {
  69     {
  70         .bus_name = "sysbus-m48t02",
  71         .model = 2,
  72         .size = 0x800,
  73     },{
  74         .bus_name = "sysbus-m48t08",
  75         .model = 8,
  76         .size = 0x2000,
  77     },{
  78         .bus_name = "sysbus-m48t59",
  79         .model = 59,
  80         .size = 0x2000,
  81     }
  82 };
  83
  84
  85 /* Fake timer functions */
  86
  87 /* Alarm management */
  88 static void alarm_cb (void *opaque)
  89 {
  90     struct tm tm;
  91     uint64_t next_time;
  92     M48t59State *NVRAM = opaque;
  93
  94     qemu_set_irq(NVRAM->IRQ, 1);
  95     if ((NVRAM->buffer[0x1FF5] & 0x80) == 0 &&
  96         (NVRAM->buffer[0x1FF4] & 0x80) == 0 &&
  97         (NVRAM->buffer[0x1FF3] & 0x80) == 0 &&
  98         (NVRAM->buffer[0x1FF2] & 0x80) == 0) {
  99         /* Repeat once a month */
 100         qemu_get_timedate(&tm, NVRAM->time_offset);
 101         tm.tm_mon++;
 102         if (tm.tm_mon == 13) {
 103             tm.tm_mon = 1;
 104             tm.tm_year++;
 105         }
 106         next_time = qemu_timedate_diff(&tm) - NVRAM->time_offset;
 107     } else if ((NVRAM->buffer[0x1FF5] & 0x80) != 0 &&
 108                (NVRAM->buffer[0x1FF4] & 0x80) == 0 &&
 109                (NVRAM->buffer[0x1FF3] & 0x80) == 0 &&
 110                (NVRAM->buffer[0x1FF2] & 0x80) == 0) {
 111         /* Repeat once a day */
 112         next_time = 24 * 60 * 60;
 113     } else if ((NVRAM->buffer[0x1FF5] & 0x80) != 0 &&
 114                (NVRAM->buffer[0x1FF4] & 0x80) != 0 &&
 115                (NVRAM->buffer[0x1FF3] & 0x80) == 0 &&
 116                (NVRAM->buffer[0x1FF2] & 0x80) == 0) {
 117         /* Repeat once an hour */
 118         next_time = 60 * 60;
 119     } else if ((NVRAM->buffer[0x1FF5] & 0x80) != 0 &&
 120                (NVRAM->buffer[0x1FF4] & 0x80) != 0 &&
 121                (NVRAM->buffer[0x1FF3] & 0x80) != 0 &&
 122                (NVRAM->buffer[0x1FF2] & 0x80) == 0) {
 123         /* Repeat once a minute */
 124         next_time = 60;
 125     } else {
 126         /* Repeat once a second */
 127         next_time = 1;
 128     }
 129     timer_mod(NVRAM->alrm_timer, qemu_clock_get_ns(rtc_clock) +
 130                     next_time * 1000);
 131     qemu_set_irq(NVRAM->IRQ, 0);
 132 }
 133
 134 static void set_alarm(M48t59State *NVRAM)
 135 {
 136     int diff;
 137     if (NVRAM->alrm_timer != NULL) {
 138         timer_del(NVRAM->alrm_timer);
 139         diff = qemu_timedate_diff(&NVRAM->alarm) - NVRAM->time_offset;
 140         if (diff > 0)
 141             timer_mod(NVRAM->alrm_timer, diff * 1000);
 142     }
 143 }
 144
 145 /* RTC management helpers */
 146 static inline void get_time(M48t59State *NVRAM, struct tm *tm)
 147 {
 148     qemu_get_timedate(tm, NVRAM->time_offset);
 149 }
 150
 151 static void set_time(M48t59State *NVRAM, struct tm *tm)
 152 {
 153     NVRAM->time_offset = qemu_timedate_diff(tm);
 154     set_alarm(NVRAM);
 155 }
 156
 157 /* Watchdog management */
 158 static void watchdog_cb (void *opaque)
 159 {
 160     M48t59State *NVRAM = opaque;
 161
 162     NVRAM->buffer[0x1FF0] |= 0x80;
 163     if (NVRAM->buffer[0x1FF7] & 0x80) {
 164         NVRAM->buffer[0x1FF7] = 0x00;
 165         NVRAM->buffer[0x1FFC] &= ~0x40;
 166         /* May it be a hw CPU Reset instead ? */
 167         qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
 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     if (addr > 0x1FF8 && addr < 0x2000)
 196         NVRAM_PRINTF("%s: 0x%08x => 0x%08x\n", __func__, addr, val);
 197
 198     /* check for NVRAM access */
 199     if ((NVRAM->model == 2 && addr < 0x7f8) ||
 200         (NVRAM->model == 8 && addr < 0x1ff8) ||
 201         (NVRAM->model == 59 && addr < 0x1ff0)) {
 202         goto do_write;
 203     }
 204
 205     /* TOD access */
 206     switch (addr) {
 207     case 0x1FF0:
 208         /* flags register : read-only */
 209         break;
 210     case 0x1FF1:
 211         /* unused */
 212         break;
 213     case 0x1FF2:
 214         /* alarm seconds */
 215         tmp = from_bcd(val & 0x7F);
 216         if (tmp >= 0 && tmp <= 59) {
 217             NVRAM->alarm.tm_sec = tmp;
 218             NVRAM->buffer[0x1FF2] = val;
 219             set_alarm(NVRAM);
 220         }
 221         break;
 222     case 0x1FF3:
 223         /* alarm minutes */
 224         tmp = from_bcd(val & 0x7F);
 225         if (tmp >= 0 && tmp <= 59) {
 226             NVRAM->alarm.tm_min = tmp;
 227             NVRAM->buffer[0x1FF3] = val;
 228             set_alarm(NVRAM);
 229         }
 230         break;
 231     case 0x1FF4:
 232         /* alarm hours */
 233         tmp = from_bcd(val & 0x3F);
 234         if (tmp >= 0 && tmp <= 23) {
 235             NVRAM->alarm.tm_hour = tmp;
 236             NVRAM->buffer[0x1FF4] = val;
 237             set_alarm(NVRAM);
 238         }
 239         break;
 240     case 0x1FF5:
 241         /* alarm date */
 242         tmp = from_bcd(val & 0x3F);
 243         if (tmp != 0) {
 244             NVRAM->alarm.tm_mday = tmp;
 245             NVRAM->buffer[0x1FF5] = val;
 246             set_alarm(NVRAM);
 247         }
 248         break;
 249     case 0x1FF6:
 250         /* interrupts */
 251         NVRAM->buffer[0x1FF6] = val;
 252         break;
 253     case 0x1FF7:
 254         /* watchdog */
 255         NVRAM->buffer[0x1FF7] = val;
 256         set_up_watchdog(NVRAM, val);
 257         break;
 258     case 0x1FF8:
 259     case 0x07F8:
 260         /* control */
 261        NVRAM->buffer[addr] = (val & ~0xA0) | 0x90;
 262         break;
 263     case 0x1FF9:
 264     case 0x07F9:
 265         /* seconds (BCD) */
 266         tmp = from_bcd(val & 0x7F);
 267         if (tmp >= 0 && tmp <= 59) {
 268             get_time(NVRAM, &tm);
 269             tm.tm_sec = tmp;
 270             set_time(NVRAM, &tm);
 271         }
 272         if ((val & 0x80) ^ (NVRAM->buffer[addr] & 0x80)) {
 273             if (val & 0x80) {
 274                 NVRAM->stop_time = time(NULL);
 275             } else {
 276                 NVRAM->time_offset += NVRAM->stop_time - time(NULL);
 277                 NVRAM->stop_time = 0;
 278             }
 279         }
 280         NVRAM->buffer[addr] = val & 0x80;
 281         break;
 282     case 0x1FFA:
 283     case 0x07FA:
 284         /* minutes (BCD) */
 285         tmp = from_bcd(val & 0x7F);
 286         if (tmp >= 0 && tmp <= 59) {
 287             get_time(NVRAM, &tm);
 288             tm.tm_min = tmp;
 289             set_time(NVRAM, &tm);
 290         }
 291         break;
 292     case 0x1FFB:
 293     case 0x07FB:
 294         /* hours (BCD) */
 295         tmp = from_bcd(val & 0x3F);
 296         if (tmp >= 0 && tmp <= 23) {
 297             get_time(NVRAM, &tm);
 298             tm.tm_hour = tmp;
 299             set_time(NVRAM, &tm);
 300         }
 301         break;
 302     case 0x1FFC:
 303     case 0x07FC:
 304         /* day of the week / century */
 305         tmp = from_bcd(val & 0x07);
 306         get_time(NVRAM, &tm);
 307         tm.tm_wday = tmp;
 308         set_time(NVRAM, &tm);
 309         NVRAM->buffer[addr] = val & 0x40;
 310         break;
 311     case 0x1FFD:
 312     case 0x07FD:
 313         /* date (BCD) */
 314        tmp = from_bcd(val & 0x3F);
 315         if (tmp != 0) {
 316             get_time(NVRAM, &tm);
 317             tm.tm_mday = tmp;
 318             set_time(NVRAM, &tm);
 319         }
 320         break;
 321     case 0x1FFE:
 322     case 0x07FE:
 323         /* month */
 324         tmp = from_bcd(val & 0x1F);
 325         if (tmp >= 1 && tmp <= 12) {
 326             get_time(NVRAM, &tm);
 327             tm.tm_mon = tmp - 1;
 328             set_time(NVRAM, &tm);
 329         }
 330         break;
 331     case 0x1FFF:
 332     case 0x07FF:
 333         /* year */
 334         tmp = from_bcd(val);
 335         if (tmp >= 0 && tmp <= 99) {
 336             get_time(NVRAM, &tm);
 337             tm.tm_year = from_bcd(val) + NVRAM->base_year - 1900;
 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(M48t59State *NVRAM, uint32_t addr)
 356 {
 357     struct tm tm;
 358     uint32_t retval = 0xFF;
 359
 360     /* check for NVRAM access */
 361     if ((NVRAM->model == 2 && addr < 0x078f) ||
 362         (NVRAM->model == 8 && addr < 0x1ff8) ||
 363         (NVRAM->model == 59 && addr < 0x1ff0)) {
 364         goto do_read;
 365     }
 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         retval = to_bcd((tm.tm_year + 1900 - NVRAM->base_year) % 100);
 440         break;
 441     default:
 442         /* Check lock registers state */
 443         if (addr >= 0x20 && addr <= 0x2F && (NVRAM->lock & 1))
 444             break;
 445         if (addr >= 0x30 && addr <= 0x3F && (NVRAM->lock & 2))
 446             break;
 447     do_read:
 448         if (addr < NVRAM->size) {
 449             retval = NVRAM->buffer[addr];
 450         }
 451         break;
 452     }
 453     if (addr > 0x1FF9 && addr < 0x2000)
 454        NVRAM_PRINTF("%s: 0x%08x <= 0x%08x\n", __func__, addr, retval);
 455
 456     return retval;
 457 }
 458
 459 /* IO access to NVRAM */
 460 static void NVRAM_writeb(void *opaque, hwaddr addr, uint64_t val,
 461                          unsigned size)
 462 {
 463     M48t59State *NVRAM = opaque;
 464
 465     NVRAM_PRINTF("%s: 0x%"HWADDR_PRIx" => 0x%"PRIx64"\n", __func__, addr, val);
 466     switch (addr) {
 467     case 0:
 468         NVRAM->addr &= ~0x00FF;
 469         NVRAM->addr |= val;
 470         break;
 471     case 1:
 472         NVRAM->addr &= ~0xFF00;
 473         NVRAM->addr |= val << 8;
 474         break;
 475     case 3:
 476         m48t59_write(NVRAM, NVRAM->addr, val);
 477         NVRAM->addr = 0x0000;
 478         break;
 479     default:
 480         break;
 481     }
 482 }
 483
 484 static uint64_t NVRAM_readb(void *opaque, hwaddr addr, unsigned size)
 485 {
 486     M48t59State *NVRAM = opaque;
 487     uint32_t retval;
 488
 489     switch (addr) {
 490     case 3:
 491         retval = m48t59_read(NVRAM, NVRAM->addr);
 492         break;
 493     default:
 494         retval = -1;
 495         break;
 496     }
 497     NVRAM_PRINTF("%s: 0x%"HWADDR_PRIx" <= 0x%08x\n", __func__, addr, retval);
 498
 499     return retval;
 500 }
 501
 502 static uint64_t nvram_read(void *opaque, hwaddr addr, unsigned size)
 503 {
 504     M48t59State *NVRAM = opaque;
 505
 506     return m48t59_read(NVRAM, addr);
 507 }
 508
 509 static void nvram_write(void *opaque, hwaddr addr, uint64_t value,
 510                         unsigned size)
 511 {
 512     M48t59State *NVRAM = opaque;
 513
 514     return m48t59_write(NVRAM, addr, value);
 515 }
 516
 517 static const MemoryRegionOps nvram_ops = {
 518     .read = nvram_read,
 519     .write = nvram_write,
 520     .impl.min_access_size = 1,
 521     .impl.max_access_size = 1,
 522     .valid.min_access_size = 1,
 523     .valid.max_access_size = 4,
 524     .endianness = DEVICE_BIG_ENDIAN,
 525 };
 526
 527 static const VMStateDescription vmstate_m48t59 = {
 528     .name = "m48t59",
 529     .version_id = 1,
 530     .minimum_version_id = 1,
 531     .fields = (VMStateField[]) {
 532         VMSTATE_UINT8(lock, M48t59State),
 533         VMSTATE_UINT16(addr, M48t59State),
 534         VMSTATE_VBUFFER_UINT32(buffer, M48t59State, 0, NULL, size),
 535         VMSTATE_END_OF_LIST()
 536     }
 537 };
 538
 539 void m48t59_reset_common(M48t59State *NVRAM)
 540 {
 541     NVRAM->addr = 0;
 542     NVRAM->lock = 0;
 543     if (NVRAM->alrm_timer != NULL)
 544         timer_del(NVRAM->alrm_timer);
 545
 546     if (NVRAM->wd_timer != NULL)
 547         timer_del(NVRAM->wd_timer);
 548 }
 549
 550 static void m48t59_reset_sysbus(DeviceState *d)
 551 {
 552     M48txxSysBusState *sys = M48TXX_SYS_BUS(d);
 553     M48t59State *NVRAM = &sys->state;
 554
 555     m48t59_reset_common(NVRAM);
 556 }
 557
 558 const MemoryRegionOps m48t59_io_ops = {
 559     .read = NVRAM_readb,
 560     .write = NVRAM_writeb,
 561     .impl = {
 562         .min_access_size = 1,
 563         .max_access_size = 1,
 564     },
 565     .endianness = DEVICE_LITTLE_ENDIAN,
 566 };
 567
 568 /* Initialisation routine */
 569 Nvram *m48t59_init(qemu_irq IRQ, hwaddr mem_base,
 570                    uint32_t io_base, uint16_t size, int base_year,
 571                    int model)
 572 {
 573     DeviceState *dev;
 574     SysBusDevice *s;
 575     int i;
 576
 577     for (i = 0; i < ARRAY_SIZE(m48txx_sysbus_info); i++) {
 578         if (m48txx_sysbus_info[i].size != size ||
 579             m48txx_sysbus_info[i].model != model) {
 580             continue;
 581         }
 582
 583         dev = qdev_create(NULL, m48txx_sysbus_info[i].bus_name);
 584         qdev_prop_set_int32(dev, "base-year", base_year);
 585         qdev_init_nofail(dev);
 586         s = SYS_BUS_DEVICE(dev);
 587         sysbus_connect_irq(s, 0, IRQ);
 588         if (io_base != 0) {
 589             memory_region_add_subregion(get_system_io(), io_base,
 590                                         sysbus_mmio_get_region(s, 1));
 591         }
 592         if (mem_base != 0) {
 593             sysbus_mmio_map(s, 0, mem_base);
 594         }
 595
 596         return NVRAM(s);
 597     }
 598
 599     assert(false);
 600     return NULL;
 601 }
 602
 603 void m48t59_realize_common(M48t59State *s, Error **errp)
 604 {
 605     s->buffer = g_malloc0(s->size);
 606     if (s->model == 59) {
 607         s->alrm_timer = timer_new_ns(rtc_clock, &alarm_cb, s);
 608         s->wd_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, &watchdog_cb, s);
 609     }
 610     qemu_get_timedate(&s->alarm, 0);
 611 }
 612
 613 static void m48t59_init1(Object *obj)
 614 {
 615     M48txxSysBusDeviceClass *u = M48TXX_SYS_BUS_GET_CLASS(obj);
 616     M48txxSysBusState *d = M48TXX_SYS_BUS(obj);
 617     SysBusDevice *dev = SYS_BUS_DEVICE(obj);
 618     M48t59State *s = &d->state;
 619
 620     s->model = u->info.model;
 621     s->size = u->info.size;
 622     sysbus_init_irq(dev, &s->IRQ);
 623
 624     memory_region_init_io(&s->iomem, obj, &nvram_ops, s, "m48t59.nvram",
 625                           s->size);
 626     memory_region_init_io(&d->io, obj, &m48t59_io_ops, s, "m48t59", 4);
 627 }
 628
 629 static void m48t59_realize(DeviceState *dev, Error **errp)
 630 {
 631     M48txxSysBusState *d = M48TXX_SYS_BUS(dev);
 632     M48t59State *s = &d->state;
 633     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 634
 635     sysbus_init_mmio(sbd, &s->iomem);
 636     sysbus_init_mmio(sbd, &d->io);
 637     m48t59_realize_common(s, errp);
 638 }
 639
 640 static uint32_t m48txx_sysbus_read(Nvram *obj, uint32_t addr)
 641 {
 642     M48txxSysBusState *d = M48TXX_SYS_BUS(obj);
 643     return m48t59_read(&d->state, addr);
 644 }
 645
 646 static void m48txx_sysbus_write(Nvram *obj, uint32_t addr, uint32_t val)
 647 {
 648     M48txxSysBusState *d = M48TXX_SYS_BUS(obj);
 649     m48t59_write(&d->state, addr, val);
 650 }
 651
 652 static void m48txx_sysbus_toggle_lock(Nvram *obj, int lock)
 653 {
 654     M48txxSysBusState *d = M48TXX_SYS_BUS(obj);
 655     m48t59_toggle_lock(&d->state, lock);
 656 }
 657
 658 static Property m48t59_sysbus_properties[] = {
 659     DEFINE_PROP_INT32("base-year", M48txxSysBusState, state.base_year, 0),
 660     DEFINE_PROP_END_OF_LIST(),
 661 };
 662
 663 static void m48txx_sysbus_class_init(ObjectClass *klass, void *data)
 664 {
 665     DeviceClass *dc = DEVICE_CLASS(klass);
 666     NvramClass *nc = NVRAM_CLASS(klass);
 667
 668     dc->realize = m48t59_realize;
 669     dc->reset = m48t59_reset_sysbus;
 670     dc->props = m48t59_sysbus_properties;
 671     dc->vmsd = &vmstate_m48t59;
 672     nc->read = m48txx_sysbus_read;
 673     nc->write = m48txx_sysbus_write;
 674     nc->toggle_lock = m48txx_sysbus_toggle_lock;
 675 }
 676
 677 static void m48txx_sysbus_concrete_class_init(ObjectClass *klass, void *data)
 678 {
 679     M48txxSysBusDeviceClass *u = M48TXX_SYS_BUS_CLASS(klass);
 680     M48txxInfo *info = data;
 681
 682     u->info = *info;
 683 }
 684
 685 static const TypeInfo nvram_info = {
 686     .name = TYPE_NVRAM,
 687     .parent = TYPE_INTERFACE,
 688     .class_size = sizeof(NvramClass),
 689 };
 690
 691 static const TypeInfo m48txx_sysbus_type_info = {
 692     .name = TYPE_M48TXX_SYS_BUS,
 693     .parent = TYPE_SYS_BUS_DEVICE,
 694     .instance_size = sizeof(M48txxSysBusState),
 695     .instance_init = m48t59_init1,
 696     .abstract = true,
 697     .class_init = m48txx_sysbus_class_init,
 698     .interfaces = (InterfaceInfo[]) {
 699         { TYPE_NVRAM },
 700         { }
 701     }
 702 };
 703
 704 static void m48t59_register_types(void)
 705 {
 706     TypeInfo sysbus_type_info = {
 707         .parent = TYPE_M48TXX_SYS_BUS,
 708         .class_size = sizeof(M48txxSysBusDeviceClass),
 709         .class_init = m48txx_sysbus_concrete_class_init,
 710     };
 711     int i;
 712
 713     type_register_static(&nvram_info);
 714     type_register_static(&m48txx_sysbus_type_info);
 715
 716     for (i = 0; i < ARRAY_SIZE(m48txx_sysbus_info); i++) {
 717         sysbus_type_info.name = m48txx_sysbus_info[i].bus_name;
 718         sysbus_type_info.class_data = &m48txx_sysbus_info[i];
 719         type_register(&sysbus_type_info);
 720     }
 721 }
 722
 723 type_init(m48t59_register_types)