sys/dev/flash/at45d.c

   1 /*-
   2  * Copyright (c) 2006 M. Warner Losh
   3  * Copyright (c) 2011-2012 Ian Lepore
   4  * Copyright (c) 2012 Marius Strobl <marius@FreeBSD.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 #include <sys/param.h>
  32 #include <sys/systm.h>
  33 #include <sys/bio.h>
  34 #include <sys/bus.h>
  35 #include <sys/conf.h>
  36 #include <sys/endian.h>
  37 #include <sys/kernel.h>
  38 #include <sys/kthread.h>
  39 #include <sys/lock.h>
  40 #include <sys/mbuf.h>
  41 #include <sys/malloc.h>
  42 #include <sys/module.h>
  43 #include <sys/mutex.h>
  44 #include <geom/geom_disk.h>
  45
  46 #include <dev/spibus/spi.h>
  47 #include "spibus_if.h"
  48
  49 #include "opt_platform.h"
  50
  51 #ifdef FDT
  52 #include <dev/fdt/fdt_common.h>
  53 #include <dev/ofw/ofw_bus_subr.h>
  54 #include <dev/ofw/openfirm.h>
  55
  56 static struct ofw_compat_data compat_data[] = {
  57         { "atmel,at45",         1 },
  58         { "atmel,dataflash",    1 },
  59         { NULL,                 0 },
  60 };
  61 #endif
  62
  63 /* This is the information returned by the MANUFACTURER_ID command. */
  64 struct at45d_mfg_info {
  65         uint32_t        jedec_id; /* Mfg ID, DevId1, DevId2, ExtLen */
  66         uint16_t        ext_id;   /* ExtId1, ExtId2 */
  67 };
  68
  69 /*
  70  * This is an entry in our table of metadata describing the chips.  We match on
  71  * both jedec id and extended id info returned by the MANUFACTURER_ID command.
  72  */
  73 struct at45d_flash_ident
  74 {
  75         const char      *name;
  76         uint32_t        jedec;
  77         uint16_t        extid;
  78         uint16_t        extmask;
  79         uint16_t        pagecount;
  80         uint16_t        pageoffset;
  81         uint16_t        pagesize;
  82         uint16_t        pagesize2n;
  83 };
  84
  85 struct at45d_softc
  86 {
  87         struct bio_queue_head   bio_queue;
  88         struct mtx              sc_mtx;
  89         struct disk             *disk;
  90         struct proc             *p;
  91         device_t                dev;
  92         u_int                   taskstate;
  93         uint16_t                pagecount;
  94         uint16_t                pageoffset;
  95         uint16_t                pagesize;
  96         void                    *dummybuf;
  97 };
  98
  99 #define TSTATE_STOPPED  0
 100 #define TSTATE_STOPPING 1
 101 #define TSTATE_RUNNING  2
 102
 103 #define AT45D_LOCK(_sc)                 mtx_lock(&(_sc)->sc_mtx)
 104 #define AT45D_UNLOCK(_sc)               mtx_unlock(&(_sc)->sc_mtx)
 105 #define AT45D_LOCK_INIT(_sc) \
 106         mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->dev), \
 107             "at45d", MTX_DEF)
 108 #define AT45D_LOCK_DESTROY(_sc)         mtx_destroy(&_sc->sc_mtx);
 109 #define AT45D_ASSERT_LOCKED(_sc)        mtx_assert(&_sc->sc_mtx, MA_OWNED);
 110 #define AT45D_ASSERT_UNLOCKED(_sc)      mtx_assert(&_sc->sc_mtx, MA_NOTOWNED);
 111
 112 /* bus entry points */
 113 static device_attach_t at45d_attach;
 114 static device_detach_t at45d_detach;
 115 static device_probe_t at45d_probe;
 116
 117 /* disk routines */
 118 static int at45d_close(struct disk *dp);
 119 static int at45d_open(struct disk *dp);
 120 static int at45d_getattr(struct bio *bp);
 121 static void at45d_strategy(struct bio *bp);
 122 static void at45d_task(void *arg);
 123
 124 /* helper routines */
 125 static void at45d_delayed_attach(void *xsc);
 126 static int at45d_get_mfg_info(device_t dev, struct at45d_mfg_info *resp);
 127 static int at45d_get_status(device_t dev, uint8_t *status);
 128 static int at45d_wait_ready(device_t dev, uint8_t *status);
 129
 130 #define PAGE_TO_BUFFER_TRANSFER         0x53
 131 #define PAGE_TO_BUFFER_COMPARE          0x60
 132 #define PROGRAM_THROUGH_BUFFER          0x82
 133 #define MANUFACTURER_ID                 0x9f
 134 #define STATUS_REGISTER_READ            0xd7
 135 #define CONTINUOUS_ARRAY_READ           0xe8
 136
 137 #define STATUS_READY                    (1u << 7)
 138 #define STATUS_CMPFAIL                  (1u << 6)
 139 #define STATUS_PAGE2N                   (1u << 0)
 140
 141 /*
 142  * Metadata for supported chips.
 143  *
 144  * The jedec id in this table includes the extended id length byte.  A match is
 145  * based on both jedec id and extended id matching.  The chip's extended id (not
 146  * present in most chips) is ANDed with ExtMask and the result is compared to
 147  * ExtId.  If a chip only returns 1 ext id byte it will be in the upper 8 bits
 148  * of ExtId in this table.
 149  *
 150  * A sectorsize2n != 0 is used to indicate that a device optionally supports
 151  * 2^N byte pages.  If support for the latter is enabled, the sector offset
 152  * has to be reduced by one.
 153  */
 154 static const struct at45d_flash_ident at45d_flash_devices[] = {
 155         /* Part Name    Jedec ID    ExtId   ExtMask PgCnt Offs PgSz PgSz2n */
 156         { "AT45DB011B", 0x1f220000, 0x0000, 0x0000,   512,  9,  264,  256 },
 157         { "AT45DB021B", 0x1f230000, 0x0000, 0x0000,  1024,  9,  264,  256 },
 158         { "AT45DB041x", 0x1f240000, 0x0000, 0x0000,  2028,  9,  264,  256 },
 159         { "AT45DB081B", 0x1f250000, 0x0000, 0x0000,  4096,  9,  264,  256 },
 160         { "AT45DB161x", 0x1f260000, 0x0000, 0x0000,  4096, 10,  528,  512 },
 161         { "AT45DB321x", 0x1f270000, 0x0000, 0x0000,  8192, 10,  528,    0 },
 162         { "AT45DB321x", 0x1f270100, 0x0000, 0x0000,  8192, 10,  528,  512 },
 163         { "AT45DB641E", 0x1f280001, 0x0000, 0xff00, 32768,  9,  264,  256 },
 164         { "AT45DB642x", 0x1f280000, 0x0000, 0x0000,  8192, 11, 1056, 1024 },
 165 };
 166
 167 static int
 168 at45d_get_status(device_t dev, uint8_t *status)
 169 {
 170         uint8_t rxBuf[8], txBuf[8];
 171         struct spi_command cmd;
 172         int err;
 173
 174         memset(&cmd, 0, sizeof(cmd));
 175         memset(txBuf, 0, sizeof(txBuf));
 176         memset(rxBuf, 0, sizeof(rxBuf));
 177
 178         txBuf[0] = STATUS_REGISTER_READ;
 179         cmd.tx_cmd = txBuf;
 180         cmd.rx_cmd = rxBuf;
 181         cmd.rx_cmd_sz = cmd.tx_cmd_sz = 2;
 182         err = SPIBUS_TRANSFER(device_get_parent(dev), dev, &cmd);
 183         *status = rxBuf[1];
 184         return (err);
 185 }
 186
 187 static int
 188 at45d_get_mfg_info(device_t dev, struct at45d_mfg_info *resp)
 189 {
 190         uint8_t rxBuf[8], txBuf[8];
 191         struct spi_command cmd;
 192         int err;
 193
 194         memset(&cmd, 0, sizeof(cmd));
 195         memset(txBuf, 0, sizeof(txBuf));
 196         memset(rxBuf, 0, sizeof(rxBuf));
 197
 198         txBuf[0] = MANUFACTURER_ID;
 199         cmd.tx_cmd = &txBuf;
 200         cmd.rx_cmd = &rxBuf;
 201         cmd.tx_cmd_sz = cmd.rx_cmd_sz = 7;
 202         err = SPIBUS_TRANSFER(device_get_parent(dev), dev, &cmd);
 203         if (err)
 204                 return (err);
 205
 206         resp->jedec_id = be32dec(rxBuf + 1);
 207         resp->ext_id   = be16dec(rxBuf + 5);
 208
 209         return (0);
 210 }
 211
 212 static int
 213 at45d_wait_ready(device_t dev, uint8_t *status)
 214 {
 215         struct timeval now, tout;
 216         int err;
 217
 218         getmicrouptime(&tout);
 219         tout.tv_sec += 3;
 220         do {
 221                 getmicrouptime(&now);
 222                 if (now.tv_sec > tout.tv_sec)
 223                         err = ETIMEDOUT;
 224                 else
 225                         err = at45d_get_status(dev, status);
 226         } while (err == 0 && !(*status & STATUS_READY));
 227         return (err);
 228 }
 229
 230 static int
 231 at45d_probe(device_t dev)
 232 {
 233         int rv;
 234
 235 #ifdef FDT
 236         if (!ofw_bus_status_okay(dev))
 237                 return (ENXIO);
 238
 239         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
 240                 return (ENXIO);
 241
 242         rv = BUS_PROBE_DEFAULT;
 243 #else
 244         rv = BUS_PROBE_NOWILDCARD;
 245 #endif
 246
 247         device_set_desc(dev, "AT45D Flash Family");
 248         return (rv);
 249 }
 250
 251 static int
 252 at45d_attach(device_t dev)
 253 {
 254         struct at45d_softc *sc;
 255
 256         sc = device_get_softc(dev);
 257         sc->dev = dev;
 258         AT45D_LOCK_INIT(sc);
 259
 260         config_intrhook_oneshot(at45d_delayed_attach, sc);
 261         return (0);
 262 }
 263
 264 static int
 265 at45d_detach(device_t dev)
 266 {
 267         struct at45d_softc *sc;
 268         int err;
 269
 270         sc = device_get_softc(dev);
 271         err = 0;
 272
 273         AT45D_LOCK(sc);
 274         if (sc->taskstate == TSTATE_RUNNING) {
 275                 sc->taskstate = TSTATE_STOPPING;
 276                 wakeup(sc);
 277                 while (err == 0 && sc->taskstate != TSTATE_STOPPED) {
 278                         err = msleep(sc, &sc->sc_mtx, 0, "at45dt", hz * 3);
 279                         if (err != 0) {
 280                                 sc->taskstate = TSTATE_RUNNING;
 281                                 device_printf(sc->dev,
 282                                     "Failed to stop queue task\n");
 283                         }
 284                 }
 285         }
 286         AT45D_UNLOCK(sc);
 287
 288         if (err == 0 && sc->taskstate == TSTATE_STOPPED) {
 289                 if (sc->disk) {
 290                         disk_destroy(sc->disk);
 291                         bioq_flush(&sc->bio_queue, NULL, ENXIO);
 292                         free(sc->dummybuf, M_DEVBUF);
 293                 }
 294                 AT45D_LOCK_DESTROY(sc);
 295         }
 296         return (err);
 297 }
 298
 299 static void
 300 at45d_delayed_attach(void *xsc)
 301 {
 302         struct at45d_softc *sc;
 303         struct at45d_mfg_info mfginfo;
 304         const struct at45d_flash_ident *ident;
 305         u_int i;
 306         int sectorsize;
 307         uint32_t jedec;
 308         uint16_t pagesize;
 309         uint8_t status;
 310
 311         sc = xsc;
 312         ident = NULL;
 313         jedec = 0;
 314
 315         if (at45d_wait_ready(sc->dev, &status) != 0) {
 316                 device_printf(sc->dev, "Error waiting for device-ready.\n");
 317                 return;
 318         }
 319         if (at45d_get_mfg_info(sc->dev, &mfginfo) != 0) {
 320                 device_printf(sc->dev, "Failed to get ID.\n");
 321                 return;
 322         }
 323         for (i = 0; i < nitems(at45d_flash_devices); i++) {
 324                 ident = &at45d_flash_devices[i];
 325                 if (mfginfo.jedec_id == ident->jedec &&
 326                     (mfginfo.ext_id & ident->extmask) == ident->extid) {
 327                         break;
 328                 }
 329         }
 330         if (i == nitems(at45d_flash_devices)) {
 331                 device_printf(sc->dev, "JEDEC 0x%x not in list.\n", jedec);
 332                 return;
 333         }
 334
 335         sc->pagecount = ident->pagecount;
 336         sc->pageoffset = ident->pageoffset;
 337         if (ident->pagesize2n != 0 && (status & STATUS_PAGE2N)) {
 338                 sc->pageoffset -= 1;
 339                 pagesize = ident->pagesize2n;
 340         } else
 341                 pagesize = ident->pagesize;
 342         sc->pagesize = pagesize;
 343
 344         /*
 345          * By default we set up a disk with a sector size that matches the
 346          * device page size.  If there is a device hint or fdt property
 347          * requesting a different size, use that, as long as it is a multiple of
 348          * the device page size).
 349          */
 350         sectorsize = pagesize;
 351 #ifdef FDT
 352         {
 353                 pcell_t size;
 354                 if (OF_getencprop(ofw_bus_get_node(sc->dev),
 355                     "freebsd,sectorsize", &size, sizeof(size)) > 0)
 356                         sectorsize = size;
 357         }
 358 #endif
 359         resource_int_value(device_get_name(sc->dev), device_get_unit(sc->dev),
 360             "sectorsize", &sectorsize);
 361
 362         if ((sectorsize % pagesize) != 0) {
 363                 device_printf(sc->dev, "Invalid sectorsize %d, "
 364                     "must be a multiple of %d\n", sectorsize, pagesize);
 365                 return;
 366         }
 367
 368         sc->dummybuf = malloc(pagesize, M_DEVBUF, M_WAITOK | M_ZERO);
 369
 370         sc->disk = disk_alloc();
 371         sc->disk->d_open = at45d_open;
 372         sc->disk->d_close = at45d_close;
 373         sc->disk->d_strategy = at45d_strategy;
 374         sc->disk->d_getattr = at45d_getattr;
 375         sc->disk->d_name = "flash/at45d";
 376         sc->disk->d_drv1 = sc;
 377         sc->disk->d_maxsize = DFLTPHYS;
 378         sc->disk->d_sectorsize = sectorsize;
 379         sc->disk->d_mediasize = pagesize * ident->pagecount;
 380         sc->disk->d_unit = device_get_unit(sc->dev);
 381         disk_create(sc->disk, DISK_VERSION);
 382         bioq_init(&sc->bio_queue);
 383         kproc_create(&at45d_task, sc, &sc->p, 0, 0, "task: at45d flash");
 384         sc->taskstate = TSTATE_RUNNING;
 385         device_printf(sc->dev,
 386             "%s, %d bytes per page, %d pages; %d KBytes; disk sector size %d\n",
 387             ident->name, pagesize, ident->pagecount,
 388             (pagesize * ident->pagecount) / 1024, sectorsize);
 389 }
 390
 391 static int
 392 at45d_open(struct disk *dp)
 393 {
 394
 395         return (0);
 396 }
 397
 398 static int
 399 at45d_close(struct disk *dp)
 400 {
 401
 402         return (0);
 403 }
 404
 405 static int
 406 at45d_getattr(struct bio *bp)
 407 {
 408         struct at45d_softc *sc;
 409
 410         /*
 411          * This function exists to support geom_flashmap and fdt_slicer.
 412          */
 413
 414         if (bp->bio_disk == NULL || bp->bio_disk->d_drv1 == NULL)
 415                 return (ENXIO);
 416         if (strcmp(bp->bio_attribute, "SPI::device") != 0)
 417                 return (-1);
 418         sc = bp->bio_disk->d_drv1;
 419         if (bp->bio_length != sizeof(sc->dev))
 420                 return (EFAULT);
 421         bcopy(&sc->dev, bp->bio_data, sizeof(sc->dev));
 422         return (0);
 423 }
 424
 425 static void
 426 at45d_strategy(struct bio *bp)
 427 {
 428         struct at45d_softc *sc;
 429
 430         sc = (struct at45d_softc *)bp->bio_disk->d_drv1;
 431         AT45D_LOCK(sc);
 432         bioq_disksort(&sc->bio_queue, bp);
 433         wakeup(sc);
 434         AT45D_UNLOCK(sc);
 435 }
 436
 437 static void
 438 at45d_task(void *arg)
 439 {
 440         uint8_t rxBuf[8], txBuf[8];
 441         struct at45d_softc *sc;
 442         struct bio *bp;
 443         struct spi_command cmd;
 444         device_t dev, pdev;
 445         caddr_t buf;
 446         u_long len, resid;
 447         u_int addr, berr, err, offset, page;
 448         uint8_t status;
 449
 450         sc = (struct at45d_softc*)arg;
 451         dev = sc->dev;
 452         pdev = device_get_parent(dev);
 453         memset(&cmd, 0, sizeof(cmd));
 454         memset(txBuf, 0, sizeof(txBuf));
 455         memset(rxBuf, 0, sizeof(rxBuf));
 456         cmd.tx_cmd = txBuf;
 457         cmd.rx_cmd = rxBuf;
 458
 459         for (;;) {
 460                 AT45D_LOCK(sc);
 461                 do {
 462                         if (sc->taskstate == TSTATE_STOPPING) {
 463                                 sc->taskstate = TSTATE_STOPPED;
 464                                 AT45D_UNLOCK(sc);
 465                                 wakeup(sc);
 466                                 kproc_exit(0);
 467                         }
 468                         bp = bioq_takefirst(&sc->bio_queue);
 469                         if (bp == NULL)
 470                                 msleep(sc, &sc->sc_mtx, PRIBIO, "at45dq", 0);
 471                 } while (bp == NULL);
 472                 AT45D_UNLOCK(sc);
 473
 474                 berr = 0;
 475                 buf = bp->bio_data;
 476                 len = resid = bp->bio_bcount;
 477                 page = bp->bio_offset / sc->pagesize;
 478                 offset = bp->bio_offset % sc->pagesize;
 479
 480                 switch (bp->bio_cmd) {
 481                 case BIO_READ:
 482                         txBuf[0] = CONTINUOUS_ARRAY_READ;
 483                         cmd.tx_cmd_sz = cmd.rx_cmd_sz = 8;
 484                         cmd.tx_data = sc->dummybuf;
 485                         cmd.rx_data = buf;
 486                         break;
 487                 case BIO_WRITE:
 488                         cmd.tx_cmd_sz = cmd.rx_cmd_sz = 4;
 489                         cmd.tx_data = buf;
 490                         cmd.rx_data = sc->dummybuf;
 491                         if (resid + offset > sc->pagesize)
 492                                 len = sc->pagesize - offset;
 493                         break;
 494                 default:
 495                         berr = EINVAL;
 496                         goto out;
 497                 }
 498
 499                 /*
 500                  * NB: for BIO_READ, this loop is only traversed once.
 501                  */
 502                 while (resid > 0) {
 503                         if (page > sc->pagecount) {
 504                                 berr = EINVAL;
 505                                 goto out;
 506                         }
 507                         addr = page << sc->pageoffset;
 508                         if (bp->bio_cmd == BIO_WRITE) {
 509                                 /*
 510                                  * If writing less than a full page, transfer
 511                                  * the existing page to the buffer, so that our
 512                                  * PROGRAM_THROUGH_BUFFER below will preserve
 513                                  * the parts of the page we're not writing.
 514                                  */
 515                                 if (len != sc->pagesize) {
 516                                         txBuf[0] = PAGE_TO_BUFFER_TRANSFER;
 517                                         txBuf[1] = ((addr >> 16) & 0xff);
 518                                         txBuf[2] = ((addr >> 8) & 0xff);
 519                                         txBuf[3] = 0;
 520                                         cmd.tx_data_sz = cmd.rx_data_sz = 0;
 521                                         err = SPIBUS_TRANSFER(pdev, dev, &cmd);
 522                                         if (err == 0)
 523                                                 err = at45d_wait_ready(dev,
 524                                                     &status);
 525                                         if (err != 0) {
 526                                                 berr = EIO;
 527                                                 goto out;
 528                                         }
 529                                 }
 530                                 txBuf[0] = PROGRAM_THROUGH_BUFFER;
 531                         }
 532
 533                         addr += offset;
 534                         txBuf[1] = ((addr >> 16) & 0xff);
 535                         txBuf[2] = ((addr >> 8) & 0xff);
 536                         txBuf[3] = (addr & 0xff);
 537                         cmd.tx_data_sz = cmd.rx_data_sz = len;
 538                         err = SPIBUS_TRANSFER(pdev, dev, &cmd);
 539                         if (err == 0 && bp->bio_cmd != BIO_READ)
 540                                 err = at45d_wait_ready(dev, &status);
 541                         if (err != 0) {
 542                                 berr = EIO;
 543                                 goto out;
 544                         }
 545                         if (bp->bio_cmd == BIO_WRITE) {
 546                                 addr = page << sc->pageoffset;
 547                                 txBuf[0] = PAGE_TO_BUFFER_COMPARE;
 548                                 txBuf[1] = ((addr >> 16) & 0xff);
 549                                 txBuf[2] = ((addr >> 8) & 0xff);
 550                                 txBuf[3] = 0;
 551                                 cmd.tx_data_sz = cmd.rx_data_sz = 0;
 552                                 err = SPIBUS_TRANSFER(pdev, dev, &cmd);
 553                                 if (err == 0)
 554                                         err = at45d_wait_ready(dev, &status);
 555                                 if (err != 0 || (status & STATUS_CMPFAIL)) {
 556                                         device_printf(dev, "comparing page "
 557                                             "%d failed (status=0x%x)\n", page,
 558                                             status);
 559                                         berr = EIO;
 560                                         goto out;
 561                                 }
 562                         }
 563                         page++;
 564                         buf += len;
 565                         offset = 0;
 566                         resid -= len;
 567                         if (resid > sc->pagesize)
 568                                 len = sc->pagesize;
 569                         else
 570                                 len = resid;
 571                         if (bp->bio_cmd == BIO_READ)
 572                                 cmd.rx_data = buf;
 573                         else
 574                                 cmd.tx_data = buf;
 575                 }
 576  out:
 577                 if (berr != 0) {
 578                         bp->bio_flags |= BIO_ERROR;
 579                         bp->bio_error = berr;
 580                 }
 581                 bp->bio_resid = resid;
 582                 biodone(bp);
 583         }
 584 }
 585
 586 static devclass_t at45d_devclass;
 587
 588 static device_method_t at45d_methods[] = {
 589         /* Device interface */
 590         DEVMETHOD(device_probe,         at45d_probe),
 591         DEVMETHOD(device_attach,        at45d_attach),
 592         DEVMETHOD(device_detach,        at45d_detach),
 593
 594         DEVMETHOD_END
 595 };
 596
 597 static driver_t at45d_driver = {
 598         "at45d",
 599         at45d_methods,
 600         sizeof(struct at45d_softc),
 601 };
 602
 603 DRIVER_MODULE(at45d, spibus, at45d_driver, at45d_devclass, NULL, NULL);
 604 MODULE_DEPEND(at45d, spibus, 1, 1, 1);
 605 #ifdef FDT
 606 MODULE_DEPEND(at45d, fdt_slicer, 1, 1, 1);
 607 #endif
 608