drivers/mtd/spi/sandbox.c

   1 /*
   2  * Simulate a SPI flash
   3  *
   4  * Copyright (c) 2011-2013 The Chromium OS Authors.
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * Licensed under the GPL-2 or later.
   9  */
  10
  11 #include <common.h>
  12 #include <dm.h>
  13 #include <malloc.h>
  14 #include <spi.h>
  15 #include <os.h>
  16
  17 #include <spi_flash.h>
  18 #include "sf_internal.h"
  19
  20 #include <asm/getopt.h>
  21 #include <asm/spi.h>
  22 #include <asm/state.h>
  23 #include <dm/device-internal.h>
  24 #include <dm/lists.h>
  25 #include <dm/uclass-internal.h>
  26
  27 DECLARE_GLOBAL_DATA_PTR;
  28
  29 /*
  30  * The different states that our SPI flash transitions between.
  31  * We need to keep track of this across multiple xfer calls since
  32  * the SPI bus could possibly call down into us multiple times.
  33  */
  34 enum sandbox_sf_state {
  35         SF_CMD,   /* default state -- we're awaiting a command */
  36         SF_ID,    /* read the flash's (jedec) ID code */
  37         SF_ADDR,  /* processing the offset in the flash to read/etc... */
  38         SF_READ,  /* reading data from the flash */
  39         SF_WRITE, /* writing data to the flash, i.e. page programming */
  40         SF_ERASE, /* erase the flash */
  41         SF_READ_STATUS, /* read the flash's status register */
  42         SF_READ_STATUS1, /* read the flash's status register upper 8 bits*/
  43         SF_WRITE_STATUS, /* write the flash's status register */
  44 };
  45
  46 static const char *sandbox_sf_state_name(enum sandbox_sf_state state)
  47 {
  48         static const char * const states[] = {
  49                 "CMD", "ID", "ADDR", "READ", "WRITE", "ERASE", "READ_STATUS",
  50                 "READ_STATUS1", "WRITE_STATUS",
  51         };
  52         return states[state];
  53 }
  54
  55 /* Bits for the status register */
  56 #define STAT_WIP        (1 << 0)
  57 #define STAT_WEL        (1 << 1)
  58
  59 /* Assume all SPI flashes have 3 byte addresses since they do atm */
  60 #define SF_ADDR_LEN     3
  61
  62 #define IDCODE_LEN 3
  63
  64 /* Used to quickly bulk erase backing store */
  65 static u8 sandbox_sf_0xff[0x1000];
  66
  67 /* Internal state data for each SPI flash */
  68 struct sandbox_spi_flash {
  69         unsigned int cs;        /* Chip select we are attached to */
  70         /*
  71          * As we receive data over the SPI bus, our flash transitions
  72          * between states.  For example, we start off in the SF_CMD
  73          * state where the first byte tells us what operation to perform
  74          * (such as read or write the flash).  But the operation itself
  75          * can go through a few states such as first reading in the
  76          * offset in the flash to perform the requested operation.
  77          * Thus "state" stores the exact state that our machine is in
  78          * while "cmd" stores the overall command we're processing.
  79          */
  80         enum sandbox_sf_state state;
  81         uint cmd;
  82         /* Erase size of current erase command */
  83         uint erase_size;
  84         /* Current position in the flash; used when reading/writing/etc... */
  85         uint off;
  86         /* How many address bytes we've consumed */
  87         uint addr_bytes, pad_addr_bytes;
  88         /* The current flash status (see STAT_XXX defines above) */
  89         u16 status;
  90         /* Data describing the flash we're emulating */
  91         const struct spi_flash_params *data;
  92         /* The file on disk to serv up data from */
  93         int fd;
  94 };
  95
  96 struct sandbox_spi_flash_plat_data {
  97         const char *filename;
  98         const char *device_name;
  99         int bus;
 100         int cs;
 101 };
 102
 103 /**
 104  * This is a very strange probe function. If it has platform data (which may
 105  * have come from the device tree) then this function gets the filename and
 106  * device type from there. Failing that it looks at the command line
 107  * parameter.
 108  */
 109 static int sandbox_sf_probe(struct udevice *dev)
 110 {
 111         /* spec = idcode:file */
 112         struct sandbox_spi_flash *sbsf = dev_get_priv(dev);
 113         const char *file;
 114         size_t len, idname_len;
 115         const struct spi_flash_params *data;
 116         struct sandbox_spi_flash_plat_data *pdata = dev_get_platdata(dev);
 117         struct sandbox_state *state = state_get_current();
 118         struct udevice *bus = dev->parent;
 119         const char *spec = NULL;
 120         int ret = 0;
 121         int cs = -1;
 122         int i;
 123
 124         debug("%s: bus %d, looking for emul=%p: ", __func__, bus->seq, dev);
 125         if (bus->seq >= 0 && bus->seq < CONFIG_SANDBOX_SPI_MAX_BUS) {
 126                 for (i = 0; i < CONFIG_SANDBOX_SPI_MAX_CS; i++) {
 127                         if (state->spi[bus->seq][i].emul == dev)
 128                                 cs = i;
 129                 }
 130         }
 131         if (cs == -1) {
 132                 printf("Error: Unknown chip select for device '%s'",
 133                        dev->name);
 134                 return -EINVAL;
 135         }
 136         debug("found at cs %d\n", cs);
 137
 138         if (!pdata->filename) {
 139                 struct sandbox_state *state = state_get_current();
 140
 141                 assert(bus->seq != -1);
 142                 if (bus->seq < CONFIG_SANDBOX_SPI_MAX_BUS)
 143                         spec = state->spi[bus->seq][cs].spec;
 144                 if (!spec)
 145                         return -ENOENT;
 146
 147                 file = strchr(spec, ':');
 148                 if (!file) {
 149                         printf("sandbox_sf: unable to parse file\n");
 150                         ret = -EINVAL;
 151                         goto error;
 152                 }
 153                 idname_len = file - spec;
 154                 pdata->filename = file + 1;
 155                 pdata->device_name = spec;
 156                 ++file;
 157         } else {
 158                 spec = strchr(pdata->device_name, ',');
 159                 if (spec)
 160                         spec++;
 161                 else
 162                         spec = pdata->device_name;
 163                 idname_len = strlen(spec);
 164         }
 165         debug("%s: device='%s'\n", __func__, spec);
 166
 167         for (data = spi_flash_params_table; data->name; data++) {
 168                 len = strlen(data->name);
 169                 if (idname_len != len)
 170                         continue;
 171                 if (!strncasecmp(spec, data->name, len))
 172                         break;
 173         }
 174         if (!data->name) {
 175                 printf("sandbox_sf: unknown flash '%*s'\n", (int)idname_len,
 176                        spec);
 177                 ret = -EINVAL;
 178                 goto error;
 179         }
 180
 181         if (sandbox_sf_0xff[0] == 0x00)
 182                 memset(sandbox_sf_0xff, 0xff, sizeof(sandbox_sf_0xff));
 183
 184         sbsf->fd = os_open(pdata->filename, 02);
 185         if (sbsf->fd == -1) {
 186                 free(sbsf);
 187                 printf("sandbox_sf: unable to open file '%s'\n",
 188                        pdata->filename);
 189                 ret = -EIO;
 190                 goto error;
 191         }
 192
 193         sbsf->data = data;
 194         sbsf->cs = cs;
 195
 196         return 0;
 197
 198  error:
 199         return ret;
 200 }
 201
 202 static int sandbox_sf_remove(struct udevice *dev)
 203 {
 204         struct sandbox_spi_flash *sbsf = dev_get_priv(dev);
 205
 206         os_close(sbsf->fd);
 207
 208         return 0;
 209 }
 210
 211 static void sandbox_sf_cs_activate(struct udevice *dev)
 212 {
 213         struct sandbox_spi_flash *sbsf = dev_get_priv(dev);
 214
 215         debug("sandbox_sf: CS activated; state is fresh!\n");
 216
 217         /* CS is asserted, so reset state */
 218         sbsf->off = 0;
 219         sbsf->addr_bytes = 0;
 220         sbsf->pad_addr_bytes = 0;
 221         sbsf->state = SF_CMD;
 222         sbsf->cmd = SF_CMD;
 223 }
 224
 225 static void sandbox_sf_cs_deactivate(struct udevice *dev)
 226 {
 227         debug("sandbox_sf: CS deactivated; cmd done processing!\n");
 228 }
 229
 230 /*
 231  * There are times when the data lines are allowed to tristate.  What
 232  * is actually sensed on the line depends on the hardware.  It could
 233  * always be 0xFF/0x00 (if there are pull ups/downs), or things could
 234  * float and so we'd get garbage back.  This func encapsulates that
 235  * scenario so we can worry about the details here.
 236  */
 237 static void sandbox_spi_tristate(u8 *buf, uint len)
 238 {
 239         /* XXX: make this into a user config option ? */
 240         memset(buf, 0xff, len);
 241 }
 242
 243 /* Figure out what command this stream is telling us to do */
 244 static int sandbox_sf_process_cmd(struct sandbox_spi_flash *sbsf, const u8 *rx,
 245                                   u8 *tx)
 246 {
 247         enum sandbox_sf_state oldstate = sbsf->state;
 248
 249         /* We need to output a byte for the cmd byte we just ate */
 250         if (tx)
 251                 sandbox_spi_tristate(tx, 1);
 252
 253         sbsf->cmd = rx[0];
 254         switch (sbsf->cmd) {
 255         case CMD_READ_ID:
 256                 sbsf->state = SF_ID;
 257                 sbsf->cmd = SF_ID;
 258                 break;
 259         case CMD_READ_ARRAY_FAST:
 260                 sbsf->pad_addr_bytes = 1;
 261         case CMD_READ_ARRAY_SLOW:
 262         case CMD_PAGE_PROGRAM:
 263                 sbsf->state = SF_ADDR;
 264                 break;
 265         case CMD_WRITE_DISABLE:
 266                 debug(" write disabled\n");
 267                 sbsf->status &= ~STAT_WEL;
 268                 break;
 269         case CMD_READ_STATUS:
 270                 sbsf->state = SF_READ_STATUS;
 271                 break;
 272         case CMD_READ_STATUS1:
 273                 sbsf->state = SF_READ_STATUS1;
 274                 break;
 275         case CMD_WRITE_ENABLE:
 276                 debug(" write enabled\n");
 277                 sbsf->status |= STAT_WEL;
 278                 break;
 279         case CMD_WRITE_STATUS:
 280                 sbsf->state = SF_WRITE_STATUS;
 281                 break;
 282         default: {
 283                 int flags = sbsf->data->flags;
 284
 285                 /* we only support erase here */
 286                 if (sbsf->cmd == CMD_ERASE_CHIP) {
 287                         sbsf->erase_size = sbsf->data->sector_size *
 288                                 sbsf->data->nr_sectors;
 289                 } else if (sbsf->cmd == CMD_ERASE_4K && (flags & SECT_4K)) {
 290                         sbsf->erase_size = 4 << 10;
 291                 } else if (sbsf->cmd == CMD_ERASE_32K && (flags & SECT_32K)) {
 292                         sbsf->erase_size = 32 << 10;
 293                 } else if (sbsf->cmd == CMD_ERASE_64K &&
 294                            !(flags & (SECT_4K | SECT_32K))) {
 295                         sbsf->erase_size = 64 << 10;
 296                 } else {
 297                         debug(" cmd unknown: %#x\n", sbsf->cmd);
 298                         return -EIO;
 299                 }
 300                 sbsf->state = SF_ADDR;
 301                 break;
 302         }
 303         }
 304
 305         if (oldstate != sbsf->state)
 306                 debug(" cmd: transition to %s state\n",
 307                       sandbox_sf_state_name(sbsf->state));
 308
 309         return 0;
 310 }
 311
 312 int sandbox_erase_part(struct sandbox_spi_flash *sbsf, int size)
 313 {
 314         int todo;
 315         int ret;
 316
 317         while (size > 0) {
 318                 todo = min(size, sizeof(sandbox_sf_0xff));
 319                 ret = os_write(sbsf->fd, sandbox_sf_0xff, todo);
 320                 if (ret != todo)
 321                         return ret;
 322                 size -= todo;
 323         }
 324
 325         return 0;
 326 }
 327
 328 static int sandbox_sf_xfer(struct udevice *dev, unsigned int bitlen,
 329                            const void *rxp, void *txp, unsigned long flags)
 330 {
 331         struct sandbox_spi_flash *sbsf = dev_get_priv(dev);
 332         const uint8_t *rx = rxp;
 333         uint8_t *tx = txp;
 334         uint cnt, pos = 0;
 335         int bytes = bitlen / 8;
 336         int ret;
 337
 338         debug("sandbox_sf: state:%x(%s) bytes:%u\n", sbsf->state,
 339               sandbox_sf_state_name(sbsf->state), bytes);
 340
 341         if ((flags & SPI_XFER_BEGIN))
 342                 sandbox_sf_cs_activate(dev);
 343
 344         if (sbsf->state == SF_CMD) {
 345                 /* Figure out the initial state */
 346                 ret = sandbox_sf_process_cmd(sbsf, rx, tx);
 347                 if (ret)
 348                         return ret;
 349                 ++pos;
 350         }
 351
 352         /* Process the remaining data */
 353         while (pos < bytes) {
 354                 switch (sbsf->state) {
 355                 case SF_ID: {
 356                         u8 id;
 357
 358                         debug(" id: off:%u tx:", sbsf->off);
 359                         if (sbsf->off < IDCODE_LEN) {
 360                                 /* Extract correct byte from ID 0x00aabbcc */
 361                                 id = sbsf->data->jedec >>
 362                                         (8 * (IDCODE_LEN - 1 - sbsf->off));
 363                         } else {
 364                                 id = 0;
 365                         }
 366                         debug("%d %02x\n", sbsf->off, id);
 367                         tx[pos++] = id;
 368                         ++sbsf->off;
 369                         break;
 370                 }
 371                 case SF_ADDR:
 372                         debug(" addr: bytes:%u rx:%02x ", sbsf->addr_bytes,
 373                               rx[pos]);
 374
 375                         if (sbsf->addr_bytes++ < SF_ADDR_LEN)
 376                                 sbsf->off = (sbsf->off << 8) | rx[pos];
 377                         debug("addr:%06x\n", sbsf->off);
 378
 379                         if (tx)
 380                                 sandbox_spi_tristate(&tx[pos], 1);
 381                         pos++;
 382
 383                         /* See if we're done processing */
 384                         if (sbsf->addr_bytes <
 385                                         SF_ADDR_LEN + sbsf->pad_addr_bytes)
 386                                 break;
 387
 388                         /* Next state! */
 389                         if (os_lseek(sbsf->fd, sbsf->off, OS_SEEK_SET) < 0) {
 390                                 puts("sandbox_sf: os_lseek() failed");
 391                                 return -EIO;
 392                         }
 393                         switch (sbsf->cmd) {
 394                         case CMD_READ_ARRAY_FAST:
 395                         case CMD_READ_ARRAY_SLOW:
 396                                 sbsf->state = SF_READ;
 397                                 break;
 398                         case CMD_PAGE_PROGRAM:
 399                                 sbsf->state = SF_WRITE;
 400                                 break;
 401                         default:
 402                                 /* assume erase state ... */
 403                                 sbsf->state = SF_ERASE;
 404                                 goto case_sf_erase;
 405                         }
 406                         debug(" cmd: transition to %s state\n",
 407                               sandbox_sf_state_name(sbsf->state));
 408                         break;
 409                 case SF_READ:
 410                         /*
 411                          * XXX: need to handle exotic behavior:
 412                          *      - reading past end of device
 413                          */
 414
 415                         cnt = bytes - pos;
 416                         debug(" tx: read(%u)\n", cnt);
 417                         assert(tx);
 418                         ret = os_read(sbsf->fd, tx + pos, cnt);
 419                         if (ret < 0) {
 420                                 puts("sandbox_sf: os_read() failed\n");
 421                                 return -EIO;
 422                         }
 423                         pos += ret;
 424                         break;
 425                 case SF_READ_STATUS:
 426                         debug(" read status: %#x\n", sbsf->status);
 427                         cnt = bytes - pos;
 428                         memset(tx + pos, sbsf->status, cnt);
 429                         pos += cnt;
 430                         break;
 431                 case SF_READ_STATUS1:
 432                         debug(" read status: %#x\n", sbsf->status);
 433                         cnt = bytes - pos;
 434                         memset(tx + pos, sbsf->status >> 8, cnt);
 435                         pos += cnt;
 436                         break;
 437                 case SF_WRITE_STATUS:
 438                         debug(" write status: %#x (ignored)\n", rx[pos]);
 439                         pos = bytes;
 440                         break;
 441                 case SF_WRITE:
 442                         /*
 443                          * XXX: need to handle exotic behavior:
 444                          *      - unaligned addresses
 445                          *      - more than a page (256) worth of data
 446                          *      - reading past end of device
 447                          */
 448                         if (!(sbsf->status & STAT_WEL)) {
 449                                 puts("sandbox_sf: write enable not set before write\n");
 450                                 goto done;
 451                         }
 452
 453                         cnt = bytes - pos;
 454                         debug(" rx: write(%u)\n", cnt);
 455                         if (tx)
 456                                 sandbox_spi_tristate(&tx[pos], cnt);
 457                         ret = os_write(sbsf->fd, rx + pos, cnt);
 458                         if (ret < 0) {
 459                                 puts("sandbox_spi: os_write() failed\n");
 460                                 return -EIO;
 461                         }
 462                         pos += ret;
 463                         sbsf->status &= ~STAT_WEL;
 464                         break;
 465                 case SF_ERASE:
 466  case_sf_erase: {
 467                         if (!(sbsf->status & STAT_WEL)) {
 468                                 puts("sandbox_sf: write enable not set before erase\n");
 469                                 goto done;
 470                         }
 471
 472                         /* verify address is aligned */
 473                         if (sbsf->off & (sbsf->erase_size - 1)) {
 474                                 debug(" sector erase: cmd:%#x needs align:%#x, but we got %#x\n",
 475                                       sbsf->cmd, sbsf->erase_size,
 476                                       sbsf->off);
 477                                 sbsf->status &= ~STAT_WEL;
 478                                 goto done;
 479                         }
 480
 481                         debug(" sector erase addr: %u, size: %u\n", sbsf->off,
 482                               sbsf->erase_size);
 483
 484                         cnt = bytes - pos;
 485                         if (tx)
 486                                 sandbox_spi_tristate(&tx[pos], cnt);
 487                         pos += cnt;
 488
 489                         /*
 490                          * TODO(vapier@gentoo.org): latch WIP in status, and
 491                          * delay before clearing it ?
 492                          */
 493                         ret = sandbox_erase_part(sbsf, sbsf->erase_size);
 494                         sbsf->status &= ~STAT_WEL;
 495                         if (ret) {
 496                                 debug("sandbox_sf: Erase failed\n");
 497                                 goto done;
 498                         }
 499                         goto done;
 500                 }
 501                 default:
 502                         debug(" ??? no idea what to do ???\n");
 503                         goto done;
 504                 }
 505         }
 506
 507  done:
 508         if (flags & SPI_XFER_END)
 509                 sandbox_sf_cs_deactivate(dev);
 510         return pos == bytes ? 0 : -EIO;
 511 }
 512
 513 int sandbox_sf_ofdata_to_platdata(struct udevice *dev)
 514 {
 515         struct sandbox_spi_flash_plat_data *pdata = dev_get_platdata(dev);
 516         const void *blob = gd->fdt_blob;
 517         int node = dev->of_offset;
 518
 519         pdata->filename = fdt_getprop(blob, node, "sandbox,filename", NULL);
 520         pdata->device_name = fdt_getprop(blob, node, "compatible", NULL);
 521         if (!pdata->filename || !pdata->device_name) {
 522                 debug("%s: Missing properties, filename=%s, device_name=%s\n",
 523                       __func__, pdata->filename, pdata->device_name);
 524                 return -EINVAL;
 525         }
 526
 527         return 0;
 528 }
 529
 530 static const struct dm_spi_emul_ops sandbox_sf_emul_ops = {
 531         .xfer          = sandbox_sf_xfer,
 532 };
 533
 534 #ifdef CONFIG_SPI_FLASH
 535 static int sandbox_cmdline_cb_spi_sf(struct sandbox_state *state,
 536                                      const char *arg)
 537 {
 538         unsigned long bus, cs;
 539         const char *spec = sandbox_spi_parse_spec(arg, &bus, &cs);
 540
 541         if (!spec)
 542                 return 1;
 543
 544         /*
 545          * It is safe to not make a copy of 'spec' because it comes from the
 546          * command line.
 547          *
 548          * TODO(sjg@chromium.org): It would be nice if we could parse the
 549          * spec here, but the problem is that no U-Boot init has been done
 550          * yet. Perhaps we can figure something out.
 551          */
 552         state->spi[bus][cs].spec = spec;
 553         return 0;
 554 }
 555 SANDBOX_CMDLINE_OPT(spi_sf, 1, "connect a SPI flash: <bus>:<cs>:<id>:<file>");
 556
 557 int sandbox_sf_bind_emul(struct sandbox_state *state, int busnum, int cs,
 558                          struct udevice *bus, int of_offset, const char *spec)
 559 {
 560         struct udevice *emul;
 561         char name[20], *str;
 562         struct driver *drv;
 563         int ret;
 564
 565         /* now the emulator */
 566         strncpy(name, spec, sizeof(name) - 6);
 567         name[sizeof(name) - 6] = '\0';
 568         strcat(name, "-emul");
 569         str = strdup(name);
 570         if (!str)
 571                 return -ENOMEM;
 572         drv = lists_driver_lookup_name("sandbox_sf_emul");
 573         if (!drv) {
 574                 puts("Cannot find sandbox_sf_emul driver\n");
 575                 return -ENOENT;
 576         }
 577         ret = device_bind(bus, drv, str, NULL, of_offset, &emul);
 578         if (ret) {
 579                 printf("Cannot create emul device for spec '%s' (err=%d)\n",
 580                        spec, ret);
 581                 return ret;
 582         }
 583         state->spi[busnum][cs].emul = emul;
 584
 585         return 0;
 586 }
 587
 588 void sandbox_sf_unbind_emul(struct sandbox_state *state, int busnum, int cs)
 589 {
 590         state->spi[busnum][cs].emul = NULL;
 591 }
 592
 593 static int sandbox_sf_bind_bus_cs(struct sandbox_state *state, int busnum,
 594                                   int cs, const char *spec)
 595 {
 596         struct udevice *bus, *slave;
 597         int ret;
 598
 599         ret = uclass_find_device_by_seq(UCLASS_SPI, busnum, true, &bus);
 600         if (ret) {
 601                 printf("Invalid bus %d for spec '%s' (err=%d)\n", busnum,
 602                        spec, ret);
 603                 return ret;
 604         }
 605         ret = device_find_child_by_seq(bus, cs, true, &slave);
 606         if (!ret) {
 607                 printf("Chip select %d already exists for spec '%s'\n", cs,
 608                        spec);
 609                 return -EEXIST;
 610         }
 611
 612         ret = spi_bind_device(bus, cs, "spi_flash_std", spec, &slave);
 613         if (ret)
 614                 return ret;
 615
 616         return sandbox_sf_bind_emul(state, busnum, cs, bus, -1, spec);
 617 }
 618
 619 int sandbox_spi_get_emul(struct sandbox_state *state,
 620                          struct udevice *bus, struct udevice *slave,
 621                          struct udevice **emulp)
 622 {
 623         struct sandbox_spi_info *info;
 624         int busnum = bus->seq;
 625         int cs = spi_chip_select(slave);
 626         int ret;
 627
 628         info = &state->spi[busnum][cs];
 629         if (!info->emul) {
 630                 /* Use the same device tree node as the SPI flash device */
 631                 debug("%s: busnum=%u, cs=%u: binding SPI flash emulation: ",
 632                       __func__, busnum, cs);
 633                 ret = sandbox_sf_bind_emul(state, busnum, cs, bus,
 634                                            slave->of_offset, slave->name);
 635                 if (ret) {
 636                         debug("failed (err=%d)\n", ret);
 637                         return ret;
 638                 }
 639                 debug("OK\n");
 640         }
 641         *emulp = info->emul;
 642
 643         return 0;
 644 }
 645
 646 int dm_scan_other(bool pre_reloc_only)
 647 {
 648         struct sandbox_state *state = state_get_current();
 649         int busnum, cs;
 650
 651         if (pre_reloc_only)
 652                 return 0;
 653         for (busnum = 0; busnum < CONFIG_SANDBOX_SPI_MAX_BUS; busnum++) {
 654                 for (cs = 0; cs < CONFIG_SANDBOX_SPI_MAX_CS; cs++) {
 655                         const char *spec = state->spi[busnum][cs].spec;
 656                         int ret;
 657
 658                         if (spec) {
 659                                 ret = sandbox_sf_bind_bus_cs(state, busnum,
 660                                                              cs, spec);
 661                                 if (ret) {
 662                                         debug("%s: Bind failed for bus %d, cs %d\n",
 663                                               __func__, busnum, cs);
 664                                         return ret;
 665                                 }
 666                         }
 667                 }
 668         }
 669
 670         return 0;
 671 }
 672 #endif
 673
 674 static const struct udevice_id sandbox_sf_ids[] = {
 675         { .compatible = "sandbox,spi-flash" },
 676         { }
 677 };
 678
 679 U_BOOT_DRIVER(sandbox_sf_emul) = {
 680         .name           = "sandbox_sf_emul",
 681         .id             = UCLASS_SPI_EMUL,
 682         .of_match       = sandbox_sf_ids,
 683         .ofdata_to_platdata = sandbox_sf_ofdata_to_platdata,
 684         .probe          = sandbox_sf_probe,
 685         .remove         = sandbox_sf_remove,
 686         .priv_auto_alloc_size = sizeof(struct sandbox_spi_flash),
 687         .platdata_auto_alloc_size = sizeof(struct sandbox_spi_flash_plat_data),
 688         .ops            = &sandbox_sf_emul_ops,
 689 };