hw/m25p80.c

   1 /*
   2  * ST M25P80 emulator. Emulate all SPI flash devices based on the m25p80 command
   3  * set. Known devices table current as of Jun/2012 and taken from linux.
   4  * See drivers/mtd/devices/m25p80.c.
   5  *
   6  * Copyright (C) 2011 Edgar E. Iglesias <edgar.iglesias@gmail.com>
   7  * Copyright (C) 2012 Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
   8  * Copyright (C) 2012 PetaLogix
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation; either version 2 or
  13  * (at your option) a later version of the License.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24 #include "hw.h"
  25 #include "sysemu/blockdev.h"
  26 #include "ssi.h"
  27 #include "devices.h"
  28
  29 #ifdef M25P80_ERR_DEBUG
  30 #define DB_PRINT(...) do { \
  31     fprintf(stderr,  ": %s: ", __func__); \
  32     fprintf(stderr, ## __VA_ARGS__); \
  33     } while (0);
  34 #else
  35     #define DB_PRINT(...)
  36 #endif
  37
  38 /* Fields for FlashPartInfo->flags */
  39
  40 /* erase capabilities */
  41 #define ER_4K 1
  42 #define ER_32K 2
  43 /* set to allow the page program command to write 0s back to 1. Useful for
  44  * modelling EEPROM with SPI flash command set
  45  */
  46 #define WR_1 0x100
  47
  48 typedef struct FlashPartInfo {
  49     const char *part_name;
  50     /* jedec code. (jedec >> 16) & 0xff is the 1st byte, >> 8 the 2nd etc */
  51     uint32_t jedec;
  52     /* extended jedec code */
  53     uint16_t ext_jedec;
  54     /* there is confusion between manufacturers as to what a sector is. In this
  55      * device model, a "sector" is the size that is erased by the ERASE_SECTOR
  56      * command (opcode 0xd8).
  57      */
  58     uint32_t sector_size;
  59     uint32_t n_sectors;
  60     uint32_t page_size;
  61     uint8_t flags;
  62 } FlashPartInfo;
  63
  64 /* adapted from linux */
  65
  66 #define INFO(_part_name, _jedec, _ext_jedec, _sector_size, _n_sectors, _flags)\
  67     .part_name = (_part_name),\
  68     .jedec = (_jedec),\
  69     .ext_jedec = (_ext_jedec),\
  70     .sector_size = (_sector_size),\
  71     .n_sectors = (_n_sectors),\
  72     .page_size = 256,\
  73     .flags = (_flags),\
  74
  75 #define JEDEC_NUMONYX 0x20
  76 #define JEDEC_WINBOND 0xEF
  77 #define JEDEC_SPANSION 0x01
  78
  79 static const FlashPartInfo known_devices[] = {
  80     /* Atmel -- some are (confusingly) marketed as "DataFlash" */
  81     { INFO("at25fs010",   0x1f6601,      0,  32 << 10,   4, ER_4K) },
  82     { INFO("at25fs040",   0x1f6604,      0,  64 << 10,   8, ER_4K) },
  83
  84     { INFO("at25df041a",  0x1f4401,      0,  64 << 10,   8, ER_4K) },
  85     { INFO("at25df321a",  0x1f4701,      0,  64 << 10,  64, ER_4K) },
  86     { INFO("at25df641",   0x1f4800,      0,  64 << 10, 128, ER_4K) },
  87
  88     { INFO("at26f004",    0x1f0400,      0,  64 << 10,   8, ER_4K) },
  89     { INFO("at26df081a",  0x1f4501,      0,  64 << 10,  16, ER_4K) },
  90     { INFO("at26df161a",  0x1f4601,      0,  64 << 10,  32, ER_4K) },
  91     { INFO("at26df321",   0x1f4700,      0,  64 << 10,  64, ER_4K) },
  92
  93     /* EON -- en25xxx */
  94     { INFO("en25f32",     0x1c3116,      0,  64 << 10,  64, ER_4K) },
  95     { INFO("en25p32",     0x1c2016,      0,  64 << 10,  64, 0) },
  96     { INFO("en25q32b",    0x1c3016,      0,  64 << 10,  64, 0) },
  97     { INFO("en25p64",     0x1c2017,      0,  64 << 10, 128, 0) },
  98
  99     /* Intel/Numonyx -- xxxs33b */
 100     { INFO("160s33b",     0x898911,      0,  64 << 10,  32, 0) },
 101     { INFO("320s33b",     0x898912,      0,  64 << 10,  64, 0) },
 102     { INFO("640s33b",     0x898913,      0,  64 << 10, 128, 0) },
 103
 104     /* Macronix */
 105     { INFO("mx25l4005a",  0xc22013,      0,  64 << 10,   8, ER_4K) },
 106     { INFO("mx25l8005",   0xc22014,      0,  64 << 10,  16, 0) },
 107     { INFO("mx25l1606e",  0xc22015,      0,  64 << 10,  32, ER_4K) },
 108     { INFO("mx25l3205d",  0xc22016,      0,  64 << 10,  64, 0) },
 109     { INFO("mx25l6405d",  0xc22017,      0,  64 << 10, 128, 0) },
 110     { INFO("mx25l12805d", 0xc22018,      0,  64 << 10, 256, 0) },
 111     { INFO("mx25l12855e", 0xc22618,      0,  64 << 10, 256, 0) },
 112     { INFO("mx25l25635e", 0xc22019,      0,  64 << 10, 512, 0) },
 113     { INFO("mx25l25655e", 0xc22619,      0,  64 << 10, 512, 0) },
 114
 115     /* Spansion -- single (large) sector size only, at least
 116      * for the chips listed here (without boot sectors).
 117      */
 118     { INFO("s25sl004a",   0x010212,      0,  64 << 10,   8, 0) },
 119     { INFO("s25sl008a",   0x010213,      0,  64 << 10,  16, 0) },
 120     { INFO("s25sl016a",   0x010214,      0,  64 << 10,  32, 0) },
 121     { INFO("s25sl032a",   0x010215,      0,  64 << 10,  64, 0) },
 122     { INFO("s25sl032p",   0x010215, 0x4d00,  64 << 10,  64, ER_4K) },
 123     { INFO("s25sl064a",   0x010216,      0,  64 << 10, 128, 0) },
 124     { INFO("s25fl256s0",  0x010219, 0x4d00, 256 << 10, 128, 0) },
 125     { INFO("s25fl256s1",  0x010219, 0x4d01,  64 << 10, 512, 0) },
 126     { INFO("s25fl512s",   0x010220, 0x4d00, 256 << 10, 256, 0) },
 127     { INFO("s70fl01gs",   0x010221, 0x4d00, 256 << 10, 256, 0) },
 128     { INFO("s25sl12800",  0x012018, 0x0300, 256 << 10,  64, 0) },
 129     { INFO("s25sl12801",  0x012018, 0x0301,  64 << 10, 256, 0) },
 130     { INFO("s25fl129p0",  0x012018, 0x4d00, 256 << 10,  64, 0) },
 131     { INFO("s25fl129p1",  0x012018, 0x4d01,  64 << 10, 256, 0) },
 132     { INFO("s25fl016k",   0xef4015,      0,  64 << 10,  32, ER_4K | ER_32K) },
 133     { INFO("s25fl064k",   0xef4017,      0,  64 << 10, 128, ER_4K | ER_32K) },
 134
 135     /* SST -- large erase sizes are "overlays", "sectors" are 4<< 10 */
 136     { INFO("sst25vf040b", 0xbf258d,      0,  64 << 10,   8, ER_4K) },
 137     { INFO("sst25vf080b", 0xbf258e,      0,  64 << 10,  16, ER_4K) },
 138     { INFO("sst25vf016b", 0xbf2541,      0,  64 << 10,  32, ER_4K) },
 139     { INFO("sst25vf032b", 0xbf254a,      0,  64 << 10,  64, ER_4K) },
 140     { INFO("sst25wf512",  0xbf2501,      0,  64 << 10,   1, ER_4K) },
 141     { INFO("sst25wf010",  0xbf2502,      0,  64 << 10,   2, ER_4K) },
 142     { INFO("sst25wf020",  0xbf2503,      0,  64 << 10,   4, ER_4K) },
 143     { INFO("sst25wf040",  0xbf2504,      0,  64 << 10,   8, ER_4K) },
 144
 145     /* ST Microelectronics -- newer production may have feature updates */
 146     { INFO("m25p05",      0x202010,      0,  32 << 10,   2, 0) },
 147     { INFO("m25p10",      0x202011,      0,  32 << 10,   4, 0) },
 148     { INFO("m25p20",      0x202012,      0,  64 << 10,   4, 0) },
 149     { INFO("m25p40",      0x202013,      0,  64 << 10,   8, 0) },
 150     { INFO("m25p80",      0x202014,      0,  64 << 10,  16, 0) },
 151     { INFO("m25p16",      0x202015,      0,  64 << 10,  32, 0) },
 152     { INFO("m25p32",      0x202016,      0,  64 << 10,  64, 0) },
 153     { INFO("m25p64",      0x202017,      0,  64 << 10, 128, 0) },
 154     { INFO("m25p128",     0x202018,      0, 256 << 10,  64, 0) },
 155
 156     { INFO("m45pe10",     0x204011,      0,  64 << 10,   2, 0) },
 157     { INFO("m45pe80",     0x204014,      0,  64 << 10,  16, 0) },
 158     { INFO("m45pe16",     0x204015,      0,  64 << 10,  32, 0) },
 159
 160     { INFO("m25pe80",     0x208014,      0,  64 << 10,  16, 0) },
 161     { INFO("m25pe16",     0x208015,      0,  64 << 10,  32, ER_4K) },
 162
 163     { INFO("m25px32",     0x207116,      0,  64 << 10,  64, ER_4K) },
 164     { INFO("m25px32-s0",  0x207316,      0,  64 << 10,  64, ER_4K) },
 165     { INFO("m25px32-s1",  0x206316,      0,  64 << 10,  64, ER_4K) },
 166     { INFO("m25px64",     0x207117,      0,  64 << 10, 128, 0) },
 167
 168     /* Winbond -- w25x "blocks" are 64k, "sectors" are 4KiB */
 169     { INFO("w25x10",      0xef3011,      0,  64 << 10,   2, ER_4K) },
 170     { INFO("w25x20",      0xef3012,      0,  64 << 10,   4, ER_4K) },
 171     { INFO("w25x40",      0xef3013,      0,  64 << 10,   8, ER_4K) },
 172     { INFO("w25x80",      0xef3014,      0,  64 << 10,  16, ER_4K) },
 173     { INFO("w25x16",      0xef3015,      0,  64 << 10,  32, ER_4K) },
 174     { INFO("w25x32",      0xef3016,      0,  64 << 10,  64, ER_4K) },
 175     { INFO("w25q32",      0xef4016,      0,  64 << 10,  64, ER_4K) },
 176     { INFO("w25x64",      0xef3017,      0,  64 << 10, 128, ER_4K) },
 177     { INFO("w25q64",      0xef4017,      0,  64 << 10, 128, ER_4K) },
 178
 179     /* Numonyx -- n25q128 */
 180     { INFO("n25q128",      0x20ba18,      0,  64 << 10, 256, 0) },
 181
 182     { },
 183 };
 184
 185 typedef enum {
 186     NOP = 0,
 187     WRSR = 0x1,
 188     WRDI = 0x4,
 189     RDSR = 0x5,
 190     WREN = 0x6,
 191     JEDEC_READ = 0x9f,
 192     BULK_ERASE = 0xc7,
 193
 194     READ = 0x3,
 195     FAST_READ = 0xb,
 196     DOR = 0x3b,
 197     QOR = 0x6b,
 198     DIOR = 0xbb,
 199     QIOR = 0xeb,
 200
 201     PP = 0x2,
 202     DPP = 0xa2,
 203     QPP = 0x32,
 204
 205     ERASE_4K = 0x20,
 206     ERASE_32K = 0x52,
 207     ERASE_SECTOR = 0xd8,
 208 } FlashCMD;
 209
 210 typedef enum {
 211     STATE_IDLE,
 212     STATE_PAGE_PROGRAM,
 213     STATE_READ,
 214     STATE_COLLECTING_DATA,
 215     STATE_READING_DATA,
 216 } CMDState;
 217
 218 typedef struct Flash {
 219     SSISlave ssidev;
 220     uint32_t r;
 221
 222     BlockDriverState *bdrv;
 223
 224     uint8_t *storage;
 225     uint32_t size;
 226     int page_size;
 227
 228     uint8_t state;
 229     uint8_t data[16];
 230     uint32_t len;
 231     uint32_t pos;
 232     uint8_t needed_bytes;
 233     uint8_t cmd_in_progress;
 234     uint64_t cur_addr;
 235     bool write_enable;
 236
 237     int64_t dirty_page;
 238
 239     char *part_name;
 240     const FlashPartInfo *pi;
 241
 242 } Flash;
 243
 244 static void bdrv_sync_complete(void *opaque, int ret)
 245 {
 246     /* do nothing. Masters do not directly interact with the backing store,
 247      * only the working copy so no mutexing required.
 248      */
 249 }
 250
 251 static void flash_sync_page(Flash *s, int page)
 252 {
 253     if (s->bdrv) {
 254         int bdrv_sector, nb_sectors;
 255         QEMUIOVector iov;
 256
 257         bdrv_sector = (page * s->pi->page_size) / BDRV_SECTOR_SIZE;
 258         nb_sectors = DIV_ROUND_UP(s->pi->page_size, BDRV_SECTOR_SIZE);
 259         qemu_iovec_init(&iov, 1);
 260         qemu_iovec_add(&iov, s->storage + bdrv_sector * BDRV_SECTOR_SIZE,
 261                                                 nb_sectors * BDRV_SECTOR_SIZE);
 262         bdrv_aio_writev(s->bdrv, bdrv_sector, &iov, nb_sectors,
 263                                                 bdrv_sync_complete, NULL);
 264     }
 265 }
 266
 267 static inline void flash_sync_area(Flash *s, int64_t off, int64_t len)
 268 {
 269     int64_t start, end, nb_sectors;
 270     QEMUIOVector iov;
 271
 272     if (!s->bdrv) {
 273         return;
 274     }
 275
 276     assert(!(len % BDRV_SECTOR_SIZE));
 277     start = off / BDRV_SECTOR_SIZE;
 278     end = (off + len) / BDRV_SECTOR_SIZE;
 279     nb_sectors = end - start;
 280     qemu_iovec_init(&iov, 1);
 281     qemu_iovec_add(&iov, s->storage + (start * BDRV_SECTOR_SIZE),
 282                                         nb_sectors * BDRV_SECTOR_SIZE);
 283     bdrv_aio_writev(s->bdrv, start, &iov, nb_sectors, bdrv_sync_complete, NULL);
 284 }
 285
 286 static void flash_erase(Flash *s, int offset, FlashCMD cmd)
 287 {
 288     uint32_t len;
 289     uint8_t capa_to_assert = 0;
 290
 291     switch (cmd) {
 292     case ERASE_4K:
 293         len = 4 << 10;
 294         capa_to_assert = ER_4K;
 295         break;
 296     case ERASE_32K:
 297         len = 32 << 10;
 298         capa_to_assert = ER_32K;
 299         break;
 300     case ERASE_SECTOR:
 301         len = s->pi->sector_size;
 302         break;
 303     case BULK_ERASE:
 304         len = s->size;
 305         break;
 306     default:
 307         abort();
 308     }
 309
 310     DB_PRINT("offset = %#x, len = %d\n", offset, len);
 311     if ((s->pi->flags & capa_to_assert) != capa_to_assert) {
 312         hw_error("m25p80: %dk erase size not supported by device\n", len);
 313     }
 314
 315     if (!s->write_enable) {
 316         DB_PRINT("erase with write protect!\n");
 317         return;
 318     }
 319     memset(s->storage + offset, 0xff, len);
 320     flash_sync_area(s, offset, len);
 321 }
 322
 323 static inline void flash_sync_dirty(Flash *s, int64_t newpage)
 324 {
 325     if (s->dirty_page >= 0 && s->dirty_page != newpage) {
 326         flash_sync_page(s, s->dirty_page);
 327         s->dirty_page = newpage;
 328     }
 329 }
 330
 331 static inline
 332 void flash_write8(Flash *s, uint64_t addr, uint8_t data)
 333 {
 334     int64_t page = addr / s->pi->page_size;
 335     uint8_t prev = s->storage[s->cur_addr];
 336
 337     if (!s->write_enable) {
 338         DB_PRINT("write with write protect!\n");
 339     }
 340
 341     if ((prev ^ data) & data) {
 342         DB_PRINT("programming zero to one! addr=%lx  %x -> %x\n",
 343                   addr, prev, data);
 344     }
 345
 346     if (s->pi->flags & WR_1) {
 347         s->storage[s->cur_addr] = data;
 348     } else {
 349         s->storage[s->cur_addr] &= data;
 350     }
 351
 352     flash_sync_dirty(s, page);
 353     s->dirty_page = page;
 354 }
 355
 356 static void complete_collecting_data(Flash *s)
 357 {
 358     s->cur_addr = s->data[0] << 16;
 359     s->cur_addr |= s->data[1] << 8;
 360     s->cur_addr |= s->data[2];
 361
 362     s->state = STATE_IDLE;
 363
 364     switch (s->cmd_in_progress) {
 365     case DPP:
 366     case QPP:
 367     case PP:
 368         s->state = STATE_PAGE_PROGRAM;
 369         break;
 370     case READ:
 371     case FAST_READ:
 372     case DOR:
 373     case QOR:
 374     case DIOR:
 375     case QIOR:
 376         s->state = STATE_READ;
 377         break;
 378     case ERASE_4K:
 379     case ERASE_32K:
 380     case ERASE_SECTOR:
 381         flash_erase(s, s->cur_addr, s->cmd_in_progress);
 382         break;
 383     case WRSR:
 384         if (s->write_enable) {
 385             s->write_enable = false;
 386         }
 387         break;
 388     default:
 389         break;
 390     }
 391 }
 392
 393 static void decode_new_cmd(Flash *s, uint32_t value)
 394 {
 395     s->cmd_in_progress = value;
 396     DB_PRINT("decoded new command:%x\n", value);
 397
 398     switch (value) {
 399
 400     case ERASE_4K:
 401     case ERASE_32K:
 402     case ERASE_SECTOR:
 403     case READ:
 404     case DPP:
 405     case QPP:
 406     case PP:
 407         s->needed_bytes = 3;
 408         s->pos = 0;
 409         s->len = 0;
 410         s->state = STATE_COLLECTING_DATA;
 411         break;
 412
 413     case FAST_READ:
 414     case DOR:
 415     case QOR:
 416         s->needed_bytes = 4;
 417         s->pos = 0;
 418         s->len = 0;
 419         s->state = STATE_COLLECTING_DATA;
 420         break;
 421
 422     case DIOR:
 423         switch ((s->pi->jedec >> 16) & 0xFF) {
 424         case JEDEC_WINBOND:
 425         case JEDEC_SPANSION:
 426             s->needed_bytes = 4;
 427             break;
 428         case JEDEC_NUMONYX:
 429         default:
 430             s->needed_bytes = 5;
 431         }
 432         s->pos = 0;
 433         s->len = 0;
 434         s->state = STATE_COLLECTING_DATA;
 435         break;
 436
 437     case QIOR:
 438         switch ((s->pi->jedec >> 16) & 0xFF) {
 439         case JEDEC_WINBOND:
 440         case JEDEC_SPANSION:
 441             s->needed_bytes = 6;
 442             break;
 443         case JEDEC_NUMONYX:
 444         default:
 445             s->needed_bytes = 8;
 446         }
 447         s->pos = 0;
 448         s->len = 0;
 449         s->state = STATE_COLLECTING_DATA;
 450         break;
 451
 452     case WRSR:
 453         if (s->write_enable) {
 454             s->needed_bytes = 1;
 455             s->pos = 0;
 456             s->len = 0;
 457             s->state = STATE_COLLECTING_DATA;
 458         }
 459         break;
 460
 461     case WRDI:
 462         s->write_enable = false;
 463         break;
 464     case WREN:
 465         s->write_enable = true;
 466         break;
 467
 468     case RDSR:
 469         s->data[0] = (!!s->write_enable) << 1;
 470         s->pos = 0;
 471         s->len = 1;
 472         s->state = STATE_READING_DATA;
 473         break;
 474
 475     case JEDEC_READ:
 476         DB_PRINT("populated jedec code\n");
 477         s->data[0] = (s->pi->jedec >> 16) & 0xff;
 478         s->data[1] = (s->pi->jedec >> 8) & 0xff;
 479         s->data[2] = s->pi->jedec & 0xff;
 480         if (s->pi->ext_jedec) {
 481             s->data[3] = (s->pi->ext_jedec >> 8) & 0xff;
 482             s->data[4] = s->pi->ext_jedec & 0xff;
 483             s->len = 5;
 484         } else {
 485             s->len = 3;
 486         }
 487         s->pos = 0;
 488         s->state = STATE_READING_DATA;
 489         break;
 490
 491     case BULK_ERASE:
 492         if (s->write_enable) {
 493             DB_PRINT("chip erase\n");
 494             flash_erase(s, 0, BULK_ERASE);
 495         } else {
 496             DB_PRINT("chip erase with write protect!\n");
 497         }
 498         break;
 499     case NOP:
 500         break;
 501     default:
 502         DB_PRINT("Unknown cmd %x\n", value);
 503         break;
 504     }
 505 }
 506
 507 static int m25p80_cs(SSISlave *ss, bool select)
 508 {
 509     Flash *s = FROM_SSI_SLAVE(Flash, ss);
 510
 511     if (select) {
 512         s->len = 0;
 513         s->pos = 0;
 514         s->state = STATE_IDLE;
 515         flash_sync_dirty(s, -1);
 516     }
 517
 518     DB_PRINT("%sselect\n", select ? "de" : "");
 519
 520     return 0;
 521 }
 522
 523 static uint32_t m25p80_transfer8(SSISlave *ss, uint32_t tx)
 524 {
 525     Flash *s = FROM_SSI_SLAVE(Flash, ss);
 526     uint32_t r = 0;
 527
 528     switch (s->state) {
 529
 530     case STATE_PAGE_PROGRAM:
 531         DB_PRINT("page program cur_addr=%lx data=%x\n", s->cur_addr,
 532                  (uint8_t)tx);
 533         flash_write8(s, s->cur_addr, (uint8_t)tx);
 534         s->cur_addr++;
 535         break;
 536
 537     case STATE_READ:
 538         r = s->storage[s->cur_addr];
 539         DB_PRINT("READ 0x%lx=%x\n", s->cur_addr, r);
 540         s->cur_addr = (s->cur_addr + 1) % s->size;
 541         break;
 542
 543     case STATE_COLLECTING_DATA:
 544         s->data[s->len] = (uint8_t)tx;
 545         s->len++;
 546
 547         if (s->len == s->needed_bytes) {
 548             complete_collecting_data(s);
 549         }
 550         break;
 551
 552     case STATE_READING_DATA:
 553         r = s->data[s->pos];
 554         s->pos++;
 555         if (s->pos == s->len) {
 556             s->pos = 0;
 557             s->state = STATE_IDLE;
 558         }
 559         break;
 560
 561     default:
 562     case STATE_IDLE:
 563         decode_new_cmd(s, (uint8_t)tx);
 564         break;
 565     }
 566
 567     return r;
 568 }
 569
 570 static int m25p80_init(SSISlave *ss)
 571 {
 572     DriveInfo *dinfo;
 573     Flash *s = FROM_SSI_SLAVE(Flash, ss);
 574     const FlashPartInfo *i;
 575
 576     if (!s->part_name) { /* default to actual m25p80 if no partname given */
 577         s->part_name = (char *)"m25p80";
 578     }
 579
 580     i = known_devices;
 581     for (i = known_devices;; i++) {
 582         assert(i);
 583         if (!i->part_name) {
 584             fprintf(stderr, "Unknown SPI flash part: \"%s\"\n", s->part_name);
 585             return 1;
 586         } else if (!strcmp(i->part_name, s->part_name)) {
 587             s->pi = i;
 588             break;
 589         }
 590     }
 591
 592     s->size = s->pi->sector_size * s->pi->n_sectors;
 593     s->dirty_page = -1;
 594     s->storage = qemu_blockalign(s->bdrv, s->size);
 595
 596     dinfo = drive_get_next(IF_MTD);
 597
 598     if (dinfo && dinfo->bdrv) {
 599         DB_PRINT("Binding to IF_MTD drive\n");
 600         s->bdrv = dinfo->bdrv;
 601         /* FIXME: Move to late init */
 602         if (bdrv_read(s->bdrv, 0, s->storage, DIV_ROUND_UP(s->size,
 603                                                     BDRV_SECTOR_SIZE))) {
 604             fprintf(stderr, "Failed to initialize SPI flash!\n");
 605             return 1;
 606         }
 607     } else {
 608         memset(s->storage, 0xFF, s->size);
 609     }
 610
 611     return 0;
 612 }
 613
 614 static void m25p80_pre_save(void *opaque)
 615 {
 616     flash_sync_dirty((Flash *)opaque, -1);
 617 }
 618
 619 static const VMStateDescription vmstate_m25p80 = {
 620     .name = "xilinx_spi",
 621     .version_id = 1,
 622     .minimum_version_id = 1,
 623     .minimum_version_id_old = 1,
 624     .pre_save = m25p80_pre_save,
 625     .fields = (VMStateField[]) {
 626         VMSTATE_UINT8(state, Flash),
 627         VMSTATE_UINT8_ARRAY(data, Flash, 16),
 628         VMSTATE_UINT32(len, Flash),
 629         VMSTATE_UINT32(pos, Flash),
 630         VMSTATE_UINT8(needed_bytes, Flash),
 631         VMSTATE_UINT8(cmd_in_progress, Flash),
 632         VMSTATE_UINT64(cur_addr, Flash),
 633         VMSTATE_BOOL(write_enable, Flash),
 634         VMSTATE_END_OF_LIST()
 635     }
 636 };
 637
 638 static Property m25p80_properties[] = {
 639     DEFINE_PROP_STRING("partname", Flash, part_name),
 640     DEFINE_PROP_END_OF_LIST(),
 641 };
 642
 643 static void m25p80_class_init(ObjectClass *klass, void *data)
 644 {
 645     DeviceClass *dc = DEVICE_CLASS(klass);
 646     SSISlaveClass *k = SSI_SLAVE_CLASS(klass);
 647
 648     k->init = m25p80_init;
 649     k->transfer = m25p80_transfer8;
 650     k->set_cs = m25p80_cs;
 651     k->cs_polarity = SSI_CS_LOW;
 652     dc->props = m25p80_properties;
 653     dc->vmsd = &vmstate_m25p80;
 654 }
 655
 656 static const TypeInfo m25p80_info = {
 657     .name           = "m25p80",
 658     .parent         = TYPE_SSI_SLAVE,
 659     .instance_size  = sizeof(Flash),
 660     .class_init     = m25p80_class_init,
 661 };
 662
 663 static void m25p80_register_types(void)
 664 {
 665     type_register_static(&m25p80_info);
 666 }
 667
 668 type_init(m25p80_register_types)