hw/ssi/npcm7xx_fiu.c

   1 /*
   2  * Nuvoton NPCM7xx Flash Interface Unit (FIU)
   3  *
   4  * Copyright 2020 Google LLC
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  14  * for more details.
  15  */
  16
  17 #include "qemu/osdep.h"
  18
  19 #include "hw/irq.h"
  20 #include "hw/qdev-properties.h"
  21 #include "hw/ssi/npcm7xx_fiu.h"
  22 #include "migration/vmstate.h"
  23 #include "qapi/error.h"
  24 #include "qemu/error-report.h"
  25 #include "qemu/log.h"
  26 #include "qemu/module.h"
  27 #include "qemu/units.h"
  28
  29 #include "trace.h"
  30
  31 /* Up to 128 MiB of flash may be accessed directly as memory. */
  32 #define NPCM7XX_FIU_FLASH_WINDOW_SIZE (128 * MiB)
  33
  34 /* Each module has 4 KiB of register space. Only a fraction of it is used. */
  35 #define NPCM7XX_FIU_CTRL_REGS_SIZE (4 * KiB)
  36
  37 /* 32-bit FIU register indices. */
  38 enum NPCM7xxFIURegister {
  39     NPCM7XX_FIU_DRD_CFG,
  40     NPCM7XX_FIU_DWR_CFG,
  41     NPCM7XX_FIU_UMA_CFG,
  42     NPCM7XX_FIU_UMA_CTS,
  43     NPCM7XX_FIU_UMA_CMD,
  44     NPCM7XX_FIU_UMA_ADDR,
  45     NPCM7XX_FIU_PRT_CFG,
  46     NPCM7XX_FIU_UMA_DW0 = 0x0020 / sizeof(uint32_t),
  47     NPCM7XX_FIU_UMA_DW1,
  48     NPCM7XX_FIU_UMA_DW2,
  49     NPCM7XX_FIU_UMA_DW3,
  50     NPCM7XX_FIU_UMA_DR0,
  51     NPCM7XX_FIU_UMA_DR1,
  52     NPCM7XX_FIU_UMA_DR2,
  53     NPCM7XX_FIU_UMA_DR3,
  54     NPCM7XX_FIU_PRT_CMD0,
  55     NPCM7XX_FIU_PRT_CMD1,
  56     NPCM7XX_FIU_PRT_CMD2,
  57     NPCM7XX_FIU_PRT_CMD3,
  58     NPCM7XX_FIU_PRT_CMD4,
  59     NPCM7XX_FIU_PRT_CMD5,
  60     NPCM7XX_FIU_PRT_CMD6,
  61     NPCM7XX_FIU_PRT_CMD7,
  62     NPCM7XX_FIU_PRT_CMD8,
  63     NPCM7XX_FIU_PRT_CMD9,
  64     NPCM7XX_FIU_CFG = 0x78 / sizeof(uint32_t),
  65     NPCM7XX_FIU_REGS_END,
  66 };
  67
  68 /* FIU_{DRD,DWR,UMA,PTR}_CFG cannot be written when this bit is set. */
  69 #define NPCM7XX_FIU_CFG_LCK BIT(31)
  70
  71 /* Direct Read configuration register fields. */
  72 #define FIU_DRD_CFG_ADDSIZ(rv) extract32(rv, 16, 2)
  73 #define FIU_ADDSIZ_3BYTES 0
  74 #define FIU_ADDSIZ_4BYTES 1
  75 #define FIU_DRD_CFG_DBW(rv) extract32(rv, 12, 2)
  76 #define FIU_DRD_CFG_ACCTYPE(rv) extract32(rv, 8, 2)
  77 #define FIU_DRD_CFG_RDCMD(rv) extract32(rv, 0, 8)
  78
  79 /* Direct Write configuration register fields. */
  80 #define FIU_DWR_CFG_ADDSIZ(rv) extract32(rv, 16, 2)
  81 #define FIU_DWR_CFG_WRCMD(rv) extract32(rv, 0, 8)
  82
  83 /* User-Mode Access register fields. */
  84
  85 /* Command Mode Lock and the bits protected by it. */
  86 #define FIU_UMA_CFG_CMMLCK BIT(30)
  87 #define FIU_UMA_CFG_CMMLCK_MASK 0x00000403
  88
  89 #define FIU_UMA_CFG_RDATSIZ(rv) extract32(rv, 24, 5)
  90 #define FIU_UMA_CFG_DBSIZ(rv) extract32(rv, 21, 3)
  91 #define FIU_UMA_CFG_WDATSIZ(rv) extract32(rv, 16, 5)
  92 #define FIU_UMA_CFG_ADDSIZ(rv) extract32(rv, 11, 3)
  93 #define FIU_UMA_CFG_CMDSIZ(rv) extract32(rv, 10, 1)
  94 #define FIU_UMA_CFG_DBPCK(rv) extract32(rv, 6, 2)
  95
  96 #define FIU_UMA_CTS_RDYIE BIT(25)
  97 #define FIU_UMA_CTS_RDYST BIT(24)
  98 #define FIU_UMA_CTS_SW_CS BIT(16)
  99 #define FIU_UMA_CTS_DEV_NUM(rv) extract32(rv, 8, 2)
 100 #define FIU_UMA_CTS_EXEC_DONE BIT(0)
 101
 102 /*
 103  * Returns the index of flash in the fiu->flash array. This corresponds to the
 104  * chip select ID of the flash.
 105  */
 106 static unsigned npcm7xx_fiu_cs_index(NPCM7xxFIUState *fiu,
 107                                      NPCM7xxFIUFlash *flash)
 108 {
 109     int index = flash - fiu->flash;
 110
 111     g_assert(index >= 0 && index < fiu->cs_count);
 112
 113     return index;
 114 }
 115
 116 /* Assert the chip select specified in the UMA Control/Status Register. */
 117 static void npcm7xx_fiu_select(NPCM7xxFIUState *s, unsigned cs_id)
 118 {
 119     trace_npcm7xx_fiu_select(DEVICE(s)->canonical_path, cs_id);
 120
 121     if (cs_id < s->cs_count) {
 122         qemu_irq_lower(s->cs_lines[cs_id]);
 123         s->active_cs = cs_id;
 124     } else {
 125         qemu_log_mask(LOG_GUEST_ERROR,
 126                       "%s: UMA to CS%d; this module has only %d chip selects",
 127                       DEVICE(s)->canonical_path, cs_id, s->cs_count);
 128         s->active_cs = -1;
 129     }
 130 }
 131
 132 /* Deassert the currently active chip select. */
 133 static void npcm7xx_fiu_deselect(NPCM7xxFIUState *s)
 134 {
 135     if (s->active_cs < 0) {
 136         return;
 137     }
 138
 139     trace_npcm7xx_fiu_deselect(DEVICE(s)->canonical_path, s->active_cs);
 140
 141     qemu_irq_raise(s->cs_lines[s->active_cs]);
 142     s->active_cs = -1;
 143 }
 144
 145 /* Direct flash memory read handler. */
 146 static uint64_t npcm7xx_fiu_flash_read(void *opaque, hwaddr addr,
 147                                        unsigned int size)
 148 {
 149     NPCM7xxFIUFlash *f = opaque;
 150     NPCM7xxFIUState *fiu = f->fiu;
 151     uint64_t value = 0;
 152     uint32_t drd_cfg;
 153     int dummy_cycles;
 154     int i;
 155
 156     if (fiu->active_cs != -1) {
 157         qemu_log_mask(LOG_GUEST_ERROR,
 158                       "%s: direct flash read with CS%d already active",
 159                       DEVICE(fiu)->canonical_path, fiu->active_cs);
 160     }
 161
 162     npcm7xx_fiu_select(fiu, npcm7xx_fiu_cs_index(fiu, f));
 163
 164     drd_cfg = fiu->regs[NPCM7XX_FIU_DRD_CFG];
 165     ssi_transfer(fiu->spi, FIU_DRD_CFG_RDCMD(drd_cfg));
 166
 167     switch (FIU_DRD_CFG_ADDSIZ(drd_cfg)) {
 168     case FIU_ADDSIZ_4BYTES:
 169         ssi_transfer(fiu->spi, extract32(addr, 24, 8));
 170         /* fall through */
 171     case FIU_ADDSIZ_3BYTES:
 172         ssi_transfer(fiu->spi, extract32(addr, 16, 8));
 173         ssi_transfer(fiu->spi, extract32(addr, 8, 8));
 174         ssi_transfer(fiu->spi, extract32(addr, 0, 8));
 175         break;
 176
 177     default:
 178         qemu_log_mask(LOG_GUEST_ERROR, "%s: bad address size %d\n",
 179                       DEVICE(fiu)->canonical_path, FIU_DRD_CFG_ADDSIZ(drd_cfg));
 180         break;
 181     }
 182
 183     /* Flash chip model expects one transfer per dummy bit, not byte */
 184     dummy_cycles =
 185         (FIU_DRD_CFG_DBW(drd_cfg) * 8) >> FIU_DRD_CFG_ACCTYPE(drd_cfg);
 186     for (i = 0; i < dummy_cycles; i++) {
 187         ssi_transfer(fiu->spi, 0);
 188     }
 189
 190     for (i = 0; i < size; i++) {
 191         value = deposit64(value, 8 * i, 8, ssi_transfer(fiu->spi, 0));
 192     }
 193
 194     trace_npcm7xx_fiu_flash_read(DEVICE(fiu)->canonical_path, fiu->active_cs,
 195                                  addr, size, value);
 196
 197     npcm7xx_fiu_deselect(fiu);
 198
 199     return value;
 200 }
 201
 202 /* Direct flash memory write handler. */
 203 static void npcm7xx_fiu_flash_write(void *opaque, hwaddr addr, uint64_t v,
 204                                     unsigned int size)
 205 {
 206     NPCM7xxFIUFlash *f = opaque;
 207     NPCM7xxFIUState *fiu = f->fiu;
 208     uint32_t dwr_cfg;
 209     unsigned cs_id;
 210     int i;
 211
 212     if (fiu->active_cs != -1) {
 213         qemu_log_mask(LOG_GUEST_ERROR,
 214                       "%s: direct flash write with CS%d already active",
 215                       DEVICE(fiu)->canonical_path, fiu->active_cs);
 216     }
 217
 218     cs_id = npcm7xx_fiu_cs_index(fiu, f);
 219     trace_npcm7xx_fiu_flash_write(DEVICE(fiu)->canonical_path, cs_id, addr,
 220                                   size, v);
 221     npcm7xx_fiu_select(fiu, cs_id);
 222
 223     dwr_cfg = fiu->regs[NPCM7XX_FIU_DWR_CFG];
 224     ssi_transfer(fiu->spi, FIU_DWR_CFG_WRCMD(dwr_cfg));
 225
 226     switch (FIU_DWR_CFG_ADDSIZ(dwr_cfg)) {
 227     case FIU_ADDSIZ_4BYTES:
 228         ssi_transfer(fiu->spi, extract32(addr, 24, 8));
 229         /* fall through */
 230     case FIU_ADDSIZ_3BYTES:
 231         ssi_transfer(fiu->spi, extract32(addr, 16, 8));
 232         ssi_transfer(fiu->spi, extract32(addr, 8, 8));
 233         ssi_transfer(fiu->spi, extract32(addr, 0, 8));
 234         break;
 235
 236     default:
 237         qemu_log_mask(LOG_GUEST_ERROR, "%s: bad address size %d\n",
 238                       DEVICE(fiu)->canonical_path, FIU_DWR_CFG_ADDSIZ(dwr_cfg));
 239         break;
 240     }
 241
 242     for (i = 0; i < size; i++) {
 243         ssi_transfer(fiu->spi, extract64(v, i * 8, 8));
 244     }
 245
 246     npcm7xx_fiu_deselect(fiu);
 247 }
 248
 249 static const MemoryRegionOps npcm7xx_fiu_flash_ops = {
 250     .read = npcm7xx_fiu_flash_read,
 251     .write = npcm7xx_fiu_flash_write,
 252     .endianness = DEVICE_LITTLE_ENDIAN,
 253     .valid = {
 254         .min_access_size = 1,
 255         .max_access_size = 8,
 256         .unaligned = true,
 257     },
 258 };
 259
 260 /* Control register read handler. */
 261 static uint64_t npcm7xx_fiu_ctrl_read(void *opaque, hwaddr addr,
 262                                       unsigned int size)
 263 {
 264     hwaddr reg = addr / sizeof(uint32_t);
 265     NPCM7xxFIUState *s = opaque;
 266     uint32_t value;
 267
 268     if (reg < NPCM7XX_FIU_NR_REGS) {
 269         value = s->regs[reg];
 270     } else {
 271         qemu_log_mask(LOG_GUEST_ERROR,
 272                       "%s: read from invalid offset 0x%" PRIx64 "\n",
 273                       DEVICE(s)->canonical_path, addr);
 274         value = 0;
 275     }
 276
 277     trace_npcm7xx_fiu_ctrl_read(DEVICE(s)->canonical_path, addr, value);
 278
 279     return value;
 280 }
 281
 282 /* Send the specified number of address bytes from the UMA address register. */
 283 static void send_address(SSIBus *spi, unsigned int addsiz, uint32_t addr)
 284 {
 285     switch (addsiz) {
 286     case 4:
 287         ssi_transfer(spi, extract32(addr, 24, 8));
 288         /* fall through */
 289     case 3:
 290         ssi_transfer(spi, extract32(addr, 16, 8));
 291         /* fall through */
 292     case 2:
 293         ssi_transfer(spi, extract32(addr, 8, 8));
 294         /* fall through */
 295     case 1:
 296         ssi_transfer(spi, extract32(addr, 0, 8));
 297         /* fall through */
 298     case 0:
 299         break;
 300     }
 301 }
 302
 303 /* Send the number of dummy bits specified in the UMA config register. */
 304 static void send_dummy_bits(SSIBus *spi, uint32_t uma_cfg, uint32_t uma_cmd)
 305 {
 306     unsigned int bits_per_clock = 1U << FIU_UMA_CFG_DBPCK(uma_cfg);
 307     unsigned int i;
 308
 309     for (i = 0; i < FIU_UMA_CFG_DBSIZ(uma_cfg); i++) {
 310         /* Use bytes 0 and 1 first, then keep repeating byte 2 */
 311         unsigned int field = (i < 2) ? ((i + 1) * 8) : 24;
 312         unsigned int j;
 313
 314         for (j = 0; j < 8; j += bits_per_clock) {
 315             ssi_transfer(spi, extract32(uma_cmd, field + j, bits_per_clock));
 316         }
 317     }
 318 }
 319
 320 /* Perform a User-Mode Access transaction. */
 321 static void npcm7xx_fiu_uma_transaction(NPCM7xxFIUState *s)
 322 {
 323     uint32_t uma_cts = s->regs[NPCM7XX_FIU_UMA_CTS];
 324     uint32_t uma_cfg;
 325     unsigned int i;
 326
 327     /* SW_CS means the CS is already forced low, so don't touch it. */
 328     if (uma_cts & FIU_UMA_CTS_SW_CS) {
 329         int cs_id = FIU_UMA_CTS_DEV_NUM(s->regs[NPCM7XX_FIU_UMA_CTS]);
 330         npcm7xx_fiu_select(s, cs_id);
 331     }
 332
 333     /* Send command, if present. */
 334     uma_cfg = s->regs[NPCM7XX_FIU_UMA_CFG];
 335     if (FIU_UMA_CFG_CMDSIZ(uma_cfg) > 0) {
 336         ssi_transfer(s->spi, extract32(s->regs[NPCM7XX_FIU_UMA_CMD], 0, 8));
 337     }
 338
 339     /* Send address, if present. */
 340     send_address(s->spi, FIU_UMA_CFG_ADDSIZ(uma_cfg),
 341                  s->regs[NPCM7XX_FIU_UMA_ADDR]);
 342
 343     /* Write data, if present. */
 344     for (i = 0; i < FIU_UMA_CFG_WDATSIZ(uma_cfg); i++) {
 345         unsigned int reg =
 346             (i < 16) ? (NPCM7XX_FIU_UMA_DW0 + i / 4) : NPCM7XX_FIU_UMA_DW3;
 347         unsigned int field = (i % 4) * 8;
 348
 349         ssi_transfer(s->spi, extract32(s->regs[reg], field, 8));
 350     }
 351
 352     /* Send dummy bits, if present. */
 353     send_dummy_bits(s->spi, uma_cfg, s->regs[NPCM7XX_FIU_UMA_CMD]);
 354
 355     /* Read data, if present. */
 356     for (i = 0; i < FIU_UMA_CFG_RDATSIZ(uma_cfg); i++) {
 357         unsigned int reg = NPCM7XX_FIU_UMA_DR0 + i / 4;
 358         unsigned int field = (i % 4) * 8;
 359         uint8_t c;
 360
 361         c = ssi_transfer(s->spi, 0);
 362         if (reg <= NPCM7XX_FIU_UMA_DR3) {
 363             s->regs[reg] = deposit32(s->regs[reg], field, 8, c);
 364         }
 365     }
 366
 367     /* Again, don't touch CS if the user is forcing it low. */
 368     if (uma_cts & FIU_UMA_CTS_SW_CS) {
 369         npcm7xx_fiu_deselect(s);
 370     }
 371
 372     /* RDYST means a command has completed since it was cleared. */
 373     s->regs[NPCM7XX_FIU_UMA_CTS] |= FIU_UMA_CTS_RDYST;
 374     /* EXEC_DONE means Execute Command / Not Done, so clear it here. */
 375     s->regs[NPCM7XX_FIU_UMA_CTS] &= ~FIU_UMA_CTS_EXEC_DONE;
 376 }
 377
 378 /* Control register write handler. */
 379 static void npcm7xx_fiu_ctrl_write(void *opaque, hwaddr addr, uint64_t v,
 380                                    unsigned int size)
 381 {
 382     hwaddr reg = addr / sizeof(uint32_t);
 383     NPCM7xxFIUState *s = opaque;
 384     uint32_t value = v;
 385
 386     trace_npcm7xx_fiu_ctrl_write(DEVICE(s)->canonical_path, addr, value);
 387
 388     switch (reg) {
 389     case NPCM7XX_FIU_UMA_CFG:
 390         if (s->regs[reg] & FIU_UMA_CFG_CMMLCK) {
 391             value &= ~FIU_UMA_CFG_CMMLCK_MASK;
 392             value |= (s->regs[reg] & FIU_UMA_CFG_CMMLCK_MASK);
 393         }
 394         /* fall through */
 395     case NPCM7XX_FIU_DRD_CFG:
 396     case NPCM7XX_FIU_DWR_CFG:
 397         if (s->regs[reg] & NPCM7XX_FIU_CFG_LCK) {
 398             qemu_log_mask(LOG_GUEST_ERROR,
 399                           "%s: write to locked register @ 0x%" PRIx64 "\n",
 400                           DEVICE(s)->canonical_path, addr);
 401             return;
 402         }
 403         s->regs[reg] = value;
 404         break;
 405
 406     case NPCM7XX_FIU_UMA_CTS:
 407         if (value & FIU_UMA_CTS_RDYST) {
 408             value &= ~FIU_UMA_CTS_RDYST;
 409         } else {
 410             value |= s->regs[reg] & FIU_UMA_CTS_RDYST;
 411         }
 412         if ((s->regs[reg] ^ value) & FIU_UMA_CTS_SW_CS) {
 413             if (value & FIU_UMA_CTS_SW_CS) {
 414                 /*
 415                  * Don't drop CS if there's a transfer in progress, or we're
 416                  * about to start one.
 417                  */
 418                 if (!((value | s->regs[reg]) & FIU_UMA_CTS_EXEC_DONE)) {
 419                     npcm7xx_fiu_deselect(s);
 420                 }
 421             } else {
 422                 int cs_id = FIU_UMA_CTS_DEV_NUM(s->regs[NPCM7XX_FIU_UMA_CTS]);
 423                 npcm7xx_fiu_select(s, cs_id);
 424             }
 425         }
 426         s->regs[reg] = value | (s->regs[reg] & FIU_UMA_CTS_EXEC_DONE);
 427         if (value & FIU_UMA_CTS_EXEC_DONE) {
 428             npcm7xx_fiu_uma_transaction(s);
 429         }
 430         break;
 431
 432     case NPCM7XX_FIU_UMA_DR0 ... NPCM7XX_FIU_UMA_DR3:
 433         qemu_log_mask(LOG_GUEST_ERROR,
 434                       "%s: write to read-only register @ 0x%" PRIx64 "\n",
 435                       DEVICE(s)->canonical_path, addr);
 436         return;
 437
 438     case NPCM7XX_FIU_PRT_CFG:
 439     case NPCM7XX_FIU_PRT_CMD0 ... NPCM7XX_FIU_PRT_CMD9:
 440         qemu_log_mask(LOG_UNIMP, "%s: PRT is not implemented\n", __func__);
 441         break;
 442
 443     case NPCM7XX_FIU_UMA_CMD:
 444     case NPCM7XX_FIU_UMA_ADDR:
 445     case NPCM7XX_FIU_UMA_DW0 ... NPCM7XX_FIU_UMA_DW3:
 446     case NPCM7XX_FIU_CFG:
 447         s->regs[reg] = value;
 448         break;
 449
 450     default:
 451         qemu_log_mask(LOG_GUEST_ERROR,
 452                       "%s: write to invalid offset 0x%" PRIx64 "\n",
 453                       DEVICE(s)->canonical_path, addr);
 454         return;
 455     }
 456 }
 457
 458 static const MemoryRegionOps npcm7xx_fiu_ctrl_ops = {
 459     .read = npcm7xx_fiu_ctrl_read,
 460     .write = npcm7xx_fiu_ctrl_write,
 461     .endianness = DEVICE_LITTLE_ENDIAN,
 462     .valid = {
 463         .min_access_size = 4,
 464         .max_access_size = 4,
 465         .unaligned = false,
 466     },
 467 };
 468
 469 static void npcm7xx_fiu_enter_reset(Object *obj, ResetType type)
 470 {
 471     NPCM7xxFIUState *s = NPCM7XX_FIU(obj);
 472
 473     trace_npcm7xx_fiu_enter_reset(DEVICE(obj)->canonical_path, type);
 474
 475     memset(s->regs, 0, sizeof(s->regs));
 476
 477     s->regs[NPCM7XX_FIU_DRD_CFG] = 0x0300100b;
 478     s->regs[NPCM7XX_FIU_DWR_CFG] = 0x03000002;
 479     s->regs[NPCM7XX_FIU_UMA_CFG] = 0x00000400;
 480     s->regs[NPCM7XX_FIU_UMA_CTS] = 0x00010000;
 481     s->regs[NPCM7XX_FIU_UMA_CMD] = 0x0000000b;
 482     s->regs[NPCM7XX_FIU_PRT_CFG] = 0x00000400;
 483     s->regs[NPCM7XX_FIU_CFG] = 0x0000000b;
 484 }
 485
 486 static void npcm7xx_fiu_hold_reset(Object *obj)
 487 {
 488     NPCM7xxFIUState *s = NPCM7XX_FIU(obj);
 489     int i;
 490
 491     trace_npcm7xx_fiu_hold_reset(DEVICE(obj)->canonical_path);
 492
 493     for (i = 0; i < s->cs_count; i++) {
 494         qemu_irq_raise(s->cs_lines[i]);
 495     }
 496 }
 497
 498 static void npcm7xx_fiu_realize(DeviceState *dev, Error **errp)
 499 {
 500     NPCM7xxFIUState *s = NPCM7XX_FIU(dev);
 501     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 502     int i;
 503
 504     if (s->cs_count <= 0) {
 505         error_setg(errp, "%s: %d chip selects specified, need at least one",
 506                    dev->canonical_path, s->cs_count);
 507         return;
 508     }
 509
 510     s->spi = ssi_create_bus(dev, "spi");
 511     s->cs_lines = g_new0(qemu_irq, s->cs_count);
 512     qdev_init_gpio_out_named(DEVICE(s), s->cs_lines, "cs", s->cs_count);
 513     s->flash = g_new0(NPCM7xxFIUFlash, s->cs_count);
 514
 515     /*
 516      * Register the control registers region first. It may be followed by one
 517      * or more direct flash access regions.
 518      */
 519     memory_region_init_io(&s->mmio, OBJECT(s), &npcm7xx_fiu_ctrl_ops, s, "ctrl",
 520                           NPCM7XX_FIU_CTRL_REGS_SIZE);
 521     sysbus_init_mmio(sbd, &s->mmio);
 522
 523     for (i = 0; i < s->cs_count; i++) {
 524         NPCM7xxFIUFlash *flash = &s->flash[i];
 525         flash->fiu = s;
 526         memory_region_init_io(&flash->direct_access, OBJECT(s),
 527                               &npcm7xx_fiu_flash_ops, &s->flash[i], "flash",
 528                               NPCM7XX_FIU_FLASH_WINDOW_SIZE);
 529         sysbus_init_mmio(sbd, &flash->direct_access);
 530     }
 531 }
 532
 533 static const VMStateDescription vmstate_npcm7xx_fiu = {
 534     .name = "npcm7xx-fiu",
 535     .version_id = 0,
 536     .minimum_version_id = 0,
 537     .fields = (const VMStateField[]) {
 538         VMSTATE_INT32(active_cs, NPCM7xxFIUState),
 539         VMSTATE_UINT32_ARRAY(regs, NPCM7xxFIUState, NPCM7XX_FIU_NR_REGS),
 540         VMSTATE_END_OF_LIST(),
 541     },
 542 };
 543
 544 static Property npcm7xx_fiu_properties[] = {
 545     DEFINE_PROP_INT32("cs-count", NPCM7xxFIUState, cs_count, 0),
 546     DEFINE_PROP_END_OF_LIST(),
 547 };
 548
 549 static void npcm7xx_fiu_class_init(ObjectClass *klass, void *data)
 550 {
 551     ResettableClass *rc = RESETTABLE_CLASS(klass);
 552     DeviceClass *dc = DEVICE_CLASS(klass);
 553
 554     QEMU_BUILD_BUG_ON(NPCM7XX_FIU_REGS_END > NPCM7XX_FIU_NR_REGS);
 555
 556     dc->desc = "NPCM7xx Flash Interface Unit";
 557     dc->realize = npcm7xx_fiu_realize;
 558     dc->vmsd = &vmstate_npcm7xx_fiu;
 559     rc->phases.enter = npcm7xx_fiu_enter_reset;
 560     rc->phases.hold = npcm7xx_fiu_hold_reset;
 561     device_class_set_props(dc, npcm7xx_fiu_properties);
 562 }
 563
 564 static const TypeInfo npcm7xx_fiu_types[] = {
 565     {
 566         .name = TYPE_NPCM7XX_FIU,
 567         .parent = TYPE_SYS_BUS_DEVICE,
 568         .instance_size = sizeof(NPCM7xxFIUState),
 569         .class_init = npcm7xx_fiu_class_init,
 570     },
 571 };
 572 DEFINE_TYPES(npcm7xx_fiu_types);