hw/pflash_cfi02.c

   1 /*
   2  *  CFI parallel flash with AMD command set emulation
   3  *
   4  *  Copyright (c) 2005 Jocelyn Mayer
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /*
  21  * For now, this code can emulate flashes of 1, 2 or 4 bytes width.
  22  * Supported commands/modes are:
  23  * - flash read
  24  * - flash write
  25  * - flash ID read
  26  * - sector erase
  27  * - chip erase
  28  * - unlock bypass command
  29  * - CFI queries
  30  *
  31  * It does not support flash interleaving.
  32  * It does not implement boot blocs with reduced size
  33  * It does not implement software data protection as found in many real chips
  34  * It does not implement erase suspend/resume commands
  35  * It does not implement multiple sectors erase
  36  */
  37
  38 #include "hw.h"
  39 #include "flash.h"
  40 #include "qemu-timer.h"
  41 #include "block.h"
  42 #include "exec-memory.h"
  43
  44 //#define PFLASH_DEBUG
  45 #ifdef PFLASH_DEBUG
  46 #define DPRINTF(fmt, ...)                          \
  47 do {                                               \
  48     printf("PFLASH: " fmt , ## __VA_ARGS__);       \
  49 } while (0)
  50 #else
  51 #define DPRINTF(fmt, ...) do { } while (0)
  52 #endif
  53
  54 #define PFLASH_LAZY_ROMD_THRESHOLD 42
  55
  56 struct pflash_t {
  57     BlockDriverState *bs;
  58     target_phys_addr_t base;
  59     uint32_t sector_len;
  60     uint32_t chip_len;
  61     int mappings;
  62     int width;
  63     int wcycle; /* if 0, the flash is read normally */
  64     int bypass;
  65     int ro;
  66     uint8_t cmd;
  67     uint8_t status;
  68     uint16_t ident[4];
  69     uint16_t unlock_addr[2];
  70     uint8_t cfi_len;
  71     uint8_t cfi_table[0x52];
  72     QEMUTimer *timer;
  73     /* The device replicates the flash memory across its memory space.  Emulate
  74      * that by having a container (.mem) filled with an array of aliases
  75      * (.mem_mappings) pointing to the flash memory (.orig_mem).
  76      */
  77     MemoryRegion mem;
  78     MemoryRegion *mem_mappings;    /* array; one per mapping */
  79     MemoryRegion orig_mem;
  80     int rom_mode;
  81     int read_counter; /* used for lazy switch-back to rom mode */
  82     void *storage;
  83 };
  84
  85 /*
  86  * Set up replicated mappings of the same region.
  87  */
  88 static void pflash_setup_mappings(pflash_t *pfl)
  89 {
  90     unsigned i;
  91     target_phys_addr_t size = memory_region_size(&pfl->orig_mem);
  92
  93     memory_region_init(&pfl->mem, "pflash", pfl->mappings * size);
  94     pfl->mem_mappings = g_new(MemoryRegion, pfl->mappings);
  95     for (i = 0; i < pfl->mappings; ++i) {
  96         memory_region_init_alias(&pfl->mem_mappings[i], "pflash-alias",
  97                                  &pfl->orig_mem, 0, size);
  98         memory_region_add_subregion(&pfl->mem, i * size, &pfl->mem_mappings[i]);
  99     }
 100 }
 101
 102 static void pflash_register_memory(pflash_t *pfl, int rom_mode)
 103 {
 104     memory_region_rom_device_set_readable(&pfl->orig_mem, rom_mode);
 105 }
 106
 107 static void pflash_timer (void *opaque)
 108 {
 109     pflash_t *pfl = opaque;
 110
 111     DPRINTF("%s: command %02x done\n", __func__, pfl->cmd);
 112     /* Reset flash */
 113     pfl->status ^= 0x80;
 114     if (pfl->bypass) {
 115         pfl->wcycle = 2;
 116     } else {
 117         pflash_register_memory(pfl, 1);
 118         pfl->wcycle = 0;
 119     }
 120     pfl->cmd = 0;
 121 }
 122
 123 static uint32_t pflash_read (pflash_t *pfl, target_phys_addr_t offset,
 124                              int width, int be)
 125 {
 126     target_phys_addr_t boff;
 127     uint32_t ret;
 128     uint8_t *p;
 129
 130     DPRINTF("%s: offset " TARGET_FMT_plx "\n", __func__, offset);
 131     ret = -1;
 132     /* Lazy reset to ROMD mode after a certain amount of read accesses */
 133     if (!pfl->rom_mode && pfl->wcycle == 0 &&
 134         ++pfl->read_counter > PFLASH_LAZY_ROMD_THRESHOLD) {
 135         pflash_register_memory(pfl, 1);
 136     }
 137     offset &= pfl->chip_len - 1;
 138     boff = offset & 0xFF;
 139     if (pfl->width == 2)
 140         boff = boff >> 1;
 141     else if (pfl->width == 4)
 142         boff = boff >> 2;
 143     switch (pfl->cmd) {
 144     default:
 145         /* This should never happen : reset state & treat it as a read*/
 146         DPRINTF("%s: unknown command state: %x\n", __func__, pfl->cmd);
 147         pfl->wcycle = 0;
 148         pfl->cmd = 0;
 149     case 0x80:
 150         /* We accept reads during second unlock sequence... */
 151     case 0x00:
 152     flash_read:
 153         /* Flash area read */
 154         p = pfl->storage;
 155         switch (width) {
 156         case 1:
 157             ret = p[offset];
 158 //            DPRINTF("%s: data offset %08x %02x\n", __func__, offset, ret);
 159             break;
 160         case 2:
 161             if (be) {
 162                 ret = p[offset] << 8;
 163                 ret |= p[offset + 1];
 164             } else {
 165                 ret = p[offset];
 166                 ret |= p[offset + 1] << 8;
 167             }
 168 //            DPRINTF("%s: data offset %08x %04x\n", __func__, offset, ret);
 169             break;
 170         case 4:
 171             if (be) {
 172                 ret = p[offset] << 24;
 173                 ret |= p[offset + 1] << 16;
 174                 ret |= p[offset + 2] << 8;
 175                 ret |= p[offset + 3];
 176             } else {
 177                 ret = p[offset];
 178                 ret |= p[offset + 1] << 8;
 179                 ret |= p[offset + 2] << 16;
 180                 ret |= p[offset + 3] << 24;
 181             }
 182 //            DPRINTF("%s: data offset %08x %08x\n", __func__, offset, ret);
 183             break;
 184         }
 185         break;
 186     case 0x90:
 187         /* flash ID read */
 188         switch (boff) {
 189         case 0x00:
 190         case 0x01:
 191             ret = pfl->ident[boff & 0x01];
 192             break;
 193         case 0x02:
 194             ret = 0x00; /* Pretend all sectors are unprotected */
 195             break;
 196         case 0x0E:
 197         case 0x0F:
 198             if (pfl->ident[2 + (boff & 0x01)] == (uint8_t)-1)
 199                 goto flash_read;
 200             ret = pfl->ident[2 + (boff & 0x01)];
 201             break;
 202         default:
 203             goto flash_read;
 204         }
 205         DPRINTF("%s: ID " TARGET_FMT_plx " %x\n", __func__, boff, ret);
 206         break;
 207     case 0xA0:
 208     case 0x10:
 209     case 0x30:
 210         /* Status register read */
 211         ret = pfl->status;
 212         DPRINTF("%s: status %x\n", __func__, ret);
 213         /* Toggle bit 6 */
 214         pfl->status ^= 0x40;
 215         break;
 216     case 0x98:
 217         /* CFI query mode */
 218         if (boff > pfl->cfi_len)
 219             ret = 0;
 220         else
 221             ret = pfl->cfi_table[boff];
 222         break;
 223     }
 224
 225     return ret;
 226 }
 227
 228 /* update flash content on disk */
 229 static void pflash_update(pflash_t *pfl, int offset,
 230                           int size)
 231 {
 232     int offset_end;
 233     if (pfl->bs) {
 234         offset_end = offset + size;
 235         /* round to sectors */
 236         offset = offset >> 9;
 237         offset_end = (offset_end + 511) >> 9;
 238         bdrv_write(pfl->bs, offset, pfl->storage + (offset << 9),
 239                    offset_end - offset);
 240     }
 241 }
 242
 243 static void pflash_write (pflash_t *pfl, target_phys_addr_t offset,
 244                           uint32_t value, int width, int be)
 245 {
 246     target_phys_addr_t boff;
 247     uint8_t *p;
 248     uint8_t cmd;
 249
 250     cmd = value;
 251     if (pfl->cmd != 0xA0 && cmd == 0xF0) {
 252 #if 0
 253         DPRINTF("%s: flash reset asked (%02x %02x)\n",
 254                 __func__, pfl->cmd, cmd);
 255 #endif
 256         goto reset_flash;
 257     }
 258     DPRINTF("%s: offset " TARGET_FMT_plx " %08x %d %d\n", __func__,
 259             offset, value, width, pfl->wcycle);
 260     offset &= pfl->chip_len - 1;
 261
 262     DPRINTF("%s: offset " TARGET_FMT_plx " %08x %d\n", __func__,
 263             offset, value, width);
 264     boff = offset & (pfl->sector_len - 1);
 265     if (pfl->width == 2)
 266         boff = boff >> 1;
 267     else if (pfl->width == 4)
 268         boff = boff >> 2;
 269     switch (pfl->wcycle) {
 270     case 0:
 271         /* Set the device in I/O access mode if required */
 272         if (pfl->rom_mode)
 273             pflash_register_memory(pfl, 0);
 274         pfl->read_counter = 0;
 275         /* We're in read mode */
 276     check_unlock0:
 277         if (boff == 0x55 && cmd == 0x98) {
 278         enter_CFI_mode:
 279             /* Enter CFI query mode */
 280             pfl->wcycle = 7;
 281             pfl->cmd = 0x98;
 282             return;
 283         }
 284         if (boff != pfl->unlock_addr[0] || cmd != 0xAA) {
 285             DPRINTF("%s: unlock0 failed " TARGET_FMT_plx " %02x %04x\n",
 286                     __func__, boff, cmd, pfl->unlock_addr[0]);
 287             goto reset_flash;
 288         }
 289         DPRINTF("%s: unlock sequence started\n", __func__);
 290         break;
 291     case 1:
 292         /* We started an unlock sequence */
 293     check_unlock1:
 294         if (boff != pfl->unlock_addr[1] || cmd != 0x55) {
 295             DPRINTF("%s: unlock1 failed " TARGET_FMT_plx " %02x\n", __func__,
 296                     boff, cmd);
 297             goto reset_flash;
 298         }
 299         DPRINTF("%s: unlock sequence done\n", __func__);
 300         break;
 301     case 2:
 302         /* We finished an unlock sequence */
 303         if (!pfl->bypass && boff != pfl->unlock_addr[0]) {
 304             DPRINTF("%s: command failed " TARGET_FMT_plx " %02x\n", __func__,
 305                     boff, cmd);
 306             goto reset_flash;
 307         }
 308         switch (cmd) {
 309         case 0x20:
 310             pfl->bypass = 1;
 311             goto do_bypass;
 312         case 0x80:
 313         case 0x90:
 314         case 0xA0:
 315             pfl->cmd = cmd;
 316             DPRINTF("%s: starting command %02x\n", __func__, cmd);
 317             break;
 318         default:
 319             DPRINTF("%s: unknown command %02x\n", __func__, cmd);
 320             goto reset_flash;
 321         }
 322         break;
 323     case 3:
 324         switch (pfl->cmd) {
 325         case 0x80:
 326             /* We need another unlock sequence */
 327             goto check_unlock0;
 328         case 0xA0:
 329             DPRINTF("%s: write data offset " TARGET_FMT_plx " %08x %d\n",
 330                     __func__, offset, value, width);
 331             p = pfl->storage;
 332             switch (width) {
 333             case 1:
 334                 p[offset] &= value;
 335                 pflash_update(pfl, offset, 1);
 336                 break;
 337             case 2:
 338                 if (be) {
 339                     p[offset] &= value >> 8;
 340                     p[offset + 1] &= value;
 341                 } else {
 342                     p[offset] &= value;
 343                     p[offset + 1] &= value >> 8;
 344                 }
 345                 pflash_update(pfl, offset, 2);
 346                 break;
 347             case 4:
 348                 if (be) {
 349                     p[offset] &= value >> 24;
 350                     p[offset + 1] &= value >> 16;
 351                     p[offset + 2] &= value >> 8;
 352                     p[offset + 3] &= value;
 353                 } else {
 354                     p[offset] &= value;
 355                     p[offset + 1] &= value >> 8;
 356                     p[offset + 2] &= value >> 16;
 357                     p[offset + 3] &= value >> 24;
 358                 }
 359                 pflash_update(pfl, offset, 4);
 360                 break;
 361             }
 362             pfl->status = 0x00 | ~(value & 0x80);
 363             /* Let's pretend write is immediate */
 364             if (pfl->bypass)
 365                 goto do_bypass;
 366             goto reset_flash;
 367         case 0x90:
 368             if (pfl->bypass && cmd == 0x00) {
 369                 /* Unlock bypass reset */
 370                 goto reset_flash;
 371             }
 372             /* We can enter CFI query mode from autoselect mode */
 373             if (boff == 0x55 && cmd == 0x98)
 374                 goto enter_CFI_mode;
 375             /* No break here */
 376         default:
 377             DPRINTF("%s: invalid write for command %02x\n",
 378                     __func__, pfl->cmd);
 379             goto reset_flash;
 380         }
 381     case 4:
 382         switch (pfl->cmd) {
 383         case 0xA0:
 384             /* Ignore writes while flash data write is occurring */
 385             /* As we suppose write is immediate, this should never happen */
 386             return;
 387         case 0x80:
 388             goto check_unlock1;
 389         default:
 390             /* Should never happen */
 391             DPRINTF("%s: invalid command state %02x (wc 4)\n",
 392                     __func__, pfl->cmd);
 393             goto reset_flash;
 394         }
 395         break;
 396     case 5:
 397         switch (cmd) {
 398         case 0x10:
 399             if (boff != pfl->unlock_addr[0]) {
 400                 DPRINTF("%s: chip erase: invalid address " TARGET_FMT_plx "\n",
 401                         __func__, offset);
 402                 goto reset_flash;
 403             }
 404             /* Chip erase */
 405             DPRINTF("%s: start chip erase\n", __func__);
 406             memset(pfl->storage, 0xFF, pfl->chip_len);
 407             pfl->status = 0x00;
 408             pflash_update(pfl, 0, pfl->chip_len);
 409             /* Let's wait 5 seconds before chip erase is done */
 410             qemu_mod_timer(pfl->timer,
 411                            qemu_get_clock_ns(vm_clock) + (get_ticks_per_sec() * 5));
 412             break;
 413         case 0x30:
 414             /* Sector erase */
 415             p = pfl->storage;
 416             offset &= ~(pfl->sector_len - 1);
 417             DPRINTF("%s: start sector erase at " TARGET_FMT_plx "\n", __func__,
 418                     offset);
 419             memset(p + offset, 0xFF, pfl->sector_len);
 420             pflash_update(pfl, offset, pfl->sector_len);
 421             pfl->status = 0x00;
 422             /* Let's wait 1/2 second before sector erase is done */
 423             qemu_mod_timer(pfl->timer,
 424                            qemu_get_clock_ns(vm_clock) + (get_ticks_per_sec() / 2));
 425             break;
 426         default:
 427             DPRINTF("%s: invalid command %02x (wc 5)\n", __func__, cmd);
 428             goto reset_flash;
 429         }
 430         pfl->cmd = cmd;
 431         break;
 432     case 6:
 433         switch (pfl->cmd) {
 434         case 0x10:
 435             /* Ignore writes during chip erase */
 436             return;
 437         case 0x30:
 438             /* Ignore writes during sector erase */
 439             return;
 440         default:
 441             /* Should never happen */
 442             DPRINTF("%s: invalid command state %02x (wc 6)\n",
 443                     __func__, pfl->cmd);
 444             goto reset_flash;
 445         }
 446         break;
 447     case 7: /* Special value for CFI queries */
 448         DPRINTF("%s: invalid write in CFI query mode\n", __func__);
 449         goto reset_flash;
 450     default:
 451         /* Should never happen */
 452         DPRINTF("%s: invalid write state (wc 7)\n",  __func__);
 453         goto reset_flash;
 454     }
 455     pfl->wcycle++;
 456
 457     return;
 458
 459     /* Reset flash */
 460  reset_flash:
 461     pfl->bypass = 0;
 462     pfl->wcycle = 0;
 463     pfl->cmd = 0;
 464     return;
 465
 466  do_bypass:
 467     pfl->wcycle = 2;
 468     pfl->cmd = 0;
 469     return;
 470 }
 471
 472
 473 static uint32_t pflash_readb_be(void *opaque, target_phys_addr_t addr)
 474 {
 475     return pflash_read(opaque, addr, 1, 1);
 476 }
 477
 478 static uint32_t pflash_readb_le(void *opaque, target_phys_addr_t addr)
 479 {
 480     return pflash_read(opaque, addr, 1, 0);
 481 }
 482
 483 static uint32_t pflash_readw_be(void *opaque, target_phys_addr_t addr)
 484 {
 485     pflash_t *pfl = opaque;
 486
 487     return pflash_read(pfl, addr, 2, 1);
 488 }
 489
 490 static uint32_t pflash_readw_le(void *opaque, target_phys_addr_t addr)
 491 {
 492     pflash_t *pfl = opaque;
 493
 494     return pflash_read(pfl, addr, 2, 0);
 495 }
 496
 497 static uint32_t pflash_readl_be(void *opaque, target_phys_addr_t addr)
 498 {
 499     pflash_t *pfl = opaque;
 500
 501     return pflash_read(pfl, addr, 4, 1);
 502 }
 503
 504 static uint32_t pflash_readl_le(void *opaque, target_phys_addr_t addr)
 505 {
 506     pflash_t *pfl = opaque;
 507
 508     return pflash_read(pfl, addr, 4, 0);
 509 }
 510
 511 static void pflash_writeb_be(void *opaque, target_phys_addr_t addr,
 512                              uint32_t value)
 513 {
 514     pflash_write(opaque, addr, value, 1, 1);
 515 }
 516
 517 static void pflash_writeb_le(void *opaque, target_phys_addr_t addr,
 518                              uint32_t value)
 519 {
 520     pflash_write(opaque, addr, value, 1, 0);
 521 }
 522
 523 static void pflash_writew_be(void *opaque, target_phys_addr_t addr,
 524                              uint32_t value)
 525 {
 526     pflash_t *pfl = opaque;
 527
 528     pflash_write(pfl, addr, value, 2, 1);
 529 }
 530
 531 static void pflash_writew_le(void *opaque, target_phys_addr_t addr,
 532                              uint32_t value)
 533 {
 534     pflash_t *pfl = opaque;
 535
 536     pflash_write(pfl, addr, value, 2, 0);
 537 }
 538
 539 static void pflash_writel_be(void *opaque, target_phys_addr_t addr,
 540                              uint32_t value)
 541 {
 542     pflash_t *pfl = opaque;
 543
 544     pflash_write(pfl, addr, value, 4, 1);
 545 }
 546
 547 static void pflash_writel_le(void *opaque, target_phys_addr_t addr,
 548                              uint32_t value)
 549 {
 550     pflash_t *pfl = opaque;
 551
 552     pflash_write(pfl, addr, value, 4, 0);
 553 }
 554
 555 static const MemoryRegionOps pflash_cfi02_ops_be = {
 556     .old_mmio = {
 557         .read = { pflash_readb_be, pflash_readw_be, pflash_readl_be, },
 558         .write = { pflash_writeb_be, pflash_writew_be, pflash_writel_be, },
 559     },
 560     .endianness = DEVICE_NATIVE_ENDIAN,
 561 };
 562
 563 static const MemoryRegionOps pflash_cfi02_ops_le = {
 564     .old_mmio = {
 565         .read = { pflash_readb_le, pflash_readw_le, pflash_readl_le, },
 566         .write = { pflash_writeb_le, pflash_writew_le, pflash_writel_le, },
 567     },
 568     .endianness = DEVICE_NATIVE_ENDIAN,
 569 };
 570
 571 /* Count trailing zeroes of a 32 bits quantity */
 572 static int ctz32 (uint32_t n)
 573 {
 574     int ret;
 575
 576     ret = 0;
 577     if (!(n & 0xFFFF)) {
 578         ret += 16;
 579         n = n >> 16;
 580     }
 581     if (!(n & 0xFF)) {
 582         ret += 8;
 583         n = n >> 8;
 584     }
 585     if (!(n & 0xF)) {
 586         ret += 4;
 587         n = n >> 4;
 588     }
 589     if (!(n & 0x3)) {
 590         ret += 2;
 591         n = n >> 2;
 592     }
 593     if (!(n & 0x1)) {
 594         ret++;
 595 #if 0 /* This is not necessary as n is never 0 */
 596         n = n >> 1;
 597 #endif
 598     }
 599 #if 0 /* This is not necessary as n is never 0 */
 600     if (!n)
 601         ret++;
 602 #endif
 603
 604     return ret;
 605 }
 606
 607 pflash_t *pflash_cfi02_register(target_phys_addr_t base,
 608                                 DeviceState *qdev, const char *name,
 609                                 target_phys_addr_t size,
 610                                 BlockDriverState *bs, uint32_t sector_len,
 611                                 int nb_blocs, int nb_mappings, int width,
 612                                 uint16_t id0, uint16_t id1,
 613                                 uint16_t id2, uint16_t id3,
 614                                 uint16_t unlock_addr0, uint16_t unlock_addr1,
 615                                 int be)
 616 {
 617     pflash_t *pfl;
 618     int32_t chip_len;
 619     int ret;
 620
 621     chip_len = sector_len * nb_blocs;
 622     /* XXX: to be fixed */
 623 #if 0
 624     if (total_len != (8 * 1024 * 1024) && total_len != (16 * 1024 * 1024) &&
 625         total_len != (32 * 1024 * 1024) && total_len != (64 * 1024 * 1024))
 626         return NULL;
 627 #endif
 628     pfl = g_malloc0(sizeof(pflash_t));
 629     memory_region_init_rom_device(
 630         &pfl->orig_mem, be ? &pflash_cfi02_ops_be : &pflash_cfi02_ops_le, pfl,
 631         qdev, name, size);
 632     pfl->storage = memory_region_get_ram_ptr(&pfl->orig_mem);
 633     pfl->base = base;
 634     pfl->chip_len = chip_len;
 635     pfl->mappings = nb_mappings;
 636     pfl->bs = bs;
 637     if (pfl->bs) {
 638         /* read the initial flash content */
 639         ret = bdrv_read(pfl->bs, 0, pfl->storage, chip_len >> 9);
 640         if (ret < 0) {
 641             g_free(pfl);
 642             return NULL;
 643         }
 644         bdrv_attach_dev_nofail(pfl->bs, pfl);
 645     }
 646     pflash_setup_mappings(pfl);
 647     pfl->rom_mode = 1;
 648     memory_region_add_subregion(get_system_memory(), pfl->base, &pfl->mem);
 649 #if 0 /* XXX: there should be a bit to set up read-only,
 650        *      the same way the hardware does (with WP pin).
 651        */
 652     pfl->ro = 1;
 653 #else
 654     pfl->ro = 0;
 655 #endif
 656     pfl->timer = qemu_new_timer_ns(vm_clock, pflash_timer, pfl);
 657     pfl->sector_len = sector_len;
 658     pfl->width = width;
 659     pfl->wcycle = 0;
 660     pfl->cmd = 0;
 661     pfl->status = 0;
 662     pfl->ident[0] = id0;
 663     pfl->ident[1] = id1;
 664     pfl->ident[2] = id2;
 665     pfl->ident[3] = id3;
 666     pfl->unlock_addr[0] = unlock_addr0;
 667     pfl->unlock_addr[1] = unlock_addr1;
 668     /* Hardcoded CFI table (mostly from SG29 Spansion flash) */
 669     pfl->cfi_len = 0x52;
 670     /* Standard "QRY" string */
 671     pfl->cfi_table[0x10] = 'Q';
 672     pfl->cfi_table[0x11] = 'R';
 673     pfl->cfi_table[0x12] = 'Y';
 674     /* Command set (AMD/Fujitsu) */
 675     pfl->cfi_table[0x13] = 0x02;
 676     pfl->cfi_table[0x14] = 0x00;
 677     /* Primary extended table address */
 678     pfl->cfi_table[0x15] = 0x31;
 679     pfl->cfi_table[0x16] = 0x00;
 680     /* Alternate command set (none) */
 681     pfl->cfi_table[0x17] = 0x00;
 682     pfl->cfi_table[0x18] = 0x00;
 683     /* Alternate extended table (none) */
 684     pfl->cfi_table[0x19] = 0x00;
 685     pfl->cfi_table[0x1A] = 0x00;
 686     /* Vcc min */
 687     pfl->cfi_table[0x1B] = 0x27;
 688     /* Vcc max */
 689     pfl->cfi_table[0x1C] = 0x36;
 690     /* Vpp min (no Vpp pin) */
 691     pfl->cfi_table[0x1D] = 0x00;
 692     /* Vpp max (no Vpp pin) */
 693     pfl->cfi_table[0x1E] = 0x00;
 694     /* Reserved */
 695     pfl->cfi_table[0x1F] = 0x07;
 696     /* Timeout for min size buffer write (NA) */
 697     pfl->cfi_table[0x20] = 0x00;
 698     /* Typical timeout for block erase (512 ms) */
 699     pfl->cfi_table[0x21] = 0x09;
 700     /* Typical timeout for full chip erase (4096 ms) */
 701     pfl->cfi_table[0x22] = 0x0C;
 702     /* Reserved */
 703     pfl->cfi_table[0x23] = 0x01;
 704     /* Max timeout for buffer write (NA) */
 705     pfl->cfi_table[0x24] = 0x00;
 706     /* Max timeout for block erase */
 707     pfl->cfi_table[0x25] = 0x0A;
 708     /* Max timeout for chip erase */
 709     pfl->cfi_table[0x26] = 0x0D;
 710     /* Device size */
 711     pfl->cfi_table[0x27] = ctz32(chip_len);
 712     /* Flash device interface (8 & 16 bits) */
 713     pfl->cfi_table[0x28] = 0x02;
 714     pfl->cfi_table[0x29] = 0x00;
 715     /* Max number of bytes in multi-bytes write */
 716     /* XXX: disable buffered write as it's not supported */
 717     //    pfl->cfi_table[0x2A] = 0x05;
 718     pfl->cfi_table[0x2A] = 0x00;
 719     pfl->cfi_table[0x2B] = 0x00;
 720     /* Number of erase block regions (uniform) */
 721     pfl->cfi_table[0x2C] = 0x01;
 722     /* Erase block region 1 */
 723     pfl->cfi_table[0x2D] = nb_blocs - 1;
 724     pfl->cfi_table[0x2E] = (nb_blocs - 1) >> 8;
 725     pfl->cfi_table[0x2F] = sector_len >> 8;
 726     pfl->cfi_table[0x30] = sector_len >> 16;
 727
 728     /* Extended */
 729     pfl->cfi_table[0x31] = 'P';
 730     pfl->cfi_table[0x32] = 'R';
 731     pfl->cfi_table[0x33] = 'I';
 732
 733     pfl->cfi_table[0x34] = '1';
 734     pfl->cfi_table[0x35] = '0';
 735
 736     pfl->cfi_table[0x36] = 0x00;
 737     pfl->cfi_table[0x37] = 0x00;
 738     pfl->cfi_table[0x38] = 0x00;
 739     pfl->cfi_table[0x39] = 0x00;
 740
 741     pfl->cfi_table[0x3a] = 0x00;
 742
 743     pfl->cfi_table[0x3b] = 0x00;
 744     pfl->cfi_table[0x3c] = 0x00;
 745
 746     return pfl;
 747 }