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   1 /*
   2  *  Parallel SCSI (SPI) transport specific attributes exported to sysfs.
   3  *
   4  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   5  *  Copyright (c) 2004, 2005 James Bottomley <James.Bottomley@SteelEye.com>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21 #include <linux/config.h>
  22 #include <linux/ctype.h>
  23 #include <linux/init.h>
  24 #include <linux/module.h>
  25 #include <linux/workqueue.h>
  26 #include <linux/blkdev.h>
  27 #include <asm/semaphore.h>
  28 #include <scsi/scsi.h>
  29 #include "scsi_priv.h"
  30 #include <scsi/scsi_device.h>
  31 #include <scsi/scsi_host.h>
  32 #include <scsi/scsi_cmnd.h>
  33 #include <scsi/scsi_eh.h>
  34 #include <scsi/scsi_transport.h>
  35 #include <scsi/scsi_transport_spi.h>
  36
  37 #define SPI_NUM_ATTRS 14        /* increase this if you add attributes */
  38 #define SPI_OTHER_ATTRS 1       /* Increase this if you add "always
  39                                  * on" attributes */
  40 #define SPI_HOST_ATTRS  1
  41
  42 #define SPI_MAX_ECHO_BUFFER_SIZE        4096
  43
  44 #define DV_LOOPS        3
  45 #define DV_TIMEOUT      (10*HZ)
  46 #define DV_RETRIES      3       /* should only need at most
  47                                  * two cc/ua clears */
  48
  49 /* Private data accessors (keep these out of the header file) */
  50 #define spi_dv_pending(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_pending)
  51 #define spi_dv_sem(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_sem)
  52
  53 struct spi_internal {
  54         struct scsi_transport_template t;
  55         struct spi_function_template *f;
  56         /* The actual attributes */
  57         struct class_device_attribute private_attrs[SPI_NUM_ATTRS];
  58         /* The array of null terminated pointers to attributes
  59          * needed by scsi_sysfs.c */
  60         struct class_device_attribute *attrs[SPI_NUM_ATTRS + SPI_OTHER_ATTRS + 1];
  61         struct class_device_attribute private_host_attrs[SPI_HOST_ATTRS];
  62         struct class_device_attribute *host_attrs[SPI_HOST_ATTRS + 1];
  63 };
  64
  65 #define to_spi_internal(tmpl)   container_of(tmpl, struct spi_internal, t)
  66
  67 static const int ppr_to_ps[] = {
  68         /* The PPR values 0-6 are reserved, fill them in when
  69          * the committee defines them */
  70         -1,                     /* 0x00 */
  71         -1,                     /* 0x01 */
  72         -1,                     /* 0x02 */
  73         -1,                     /* 0x03 */
  74         -1,                     /* 0x04 */
  75         -1,                     /* 0x05 */
  76         -1,                     /* 0x06 */
  77          3125,                  /* 0x07 */
  78          6250,                  /* 0x08 */
  79         12500,                  /* 0x09 */
  80         25000,                  /* 0x0a */
  81         30300,                  /* 0x0b */
  82         50000,                  /* 0x0c */
  83 };
  84 /* The PPR values at which you calculate the period in ns by multiplying
  85  * by 4 */
  86 #define SPI_STATIC_PPR  0x0c
  87
  88 static int sprint_frac(char *dest, int value, int denom)
  89 {
  90         int frac = value % denom;
  91         int result = sprintf(dest, "%d", value / denom);
  92
  93         if (frac == 0)
  94                 return result;
  95         dest[result++] = '.';
  96
  97         do {
  98                 denom /= 10;
  99                 sprintf(dest + result, "%d", frac / denom);
 100                 result++;
 101                 frac %= denom;
 102         } while (frac);
 103
 104         dest[result++] = '\0';
 105         return result;
 106 }
 107
 108 static int spi_execute(struct scsi_device *sdev, const void *cmd,
 109                        enum dma_data_direction dir,
 110                        void *buffer, unsigned bufflen,
 111                        struct scsi_sense_hdr *sshdr)
 112 {
 113         int i, result;
 114         unsigned char sense[SCSI_SENSE_BUFFERSIZE];
 115
 116         for(i = 0; i < DV_RETRIES; i++) {
 117                 result = scsi_execute(sdev, cmd, dir, buffer, bufflen,
 118                                       sense, DV_TIMEOUT, /* retries */ 1,
 119                                       REQ_FAILFAST);
 120                 if (result & DRIVER_SENSE) {
 121                         struct scsi_sense_hdr sshdr_tmp;
 122                         if (!sshdr)
 123                                 sshdr = &sshdr_tmp;
 124
 125                         if (scsi_normalize_sense(sense, sizeof(*sense),
 126                                                  sshdr)
 127                             && sshdr->sense_key == UNIT_ATTENTION)
 128                                 continue;
 129                 }
 130                 break;
 131         }
 132         return result;
 133 }
 134
 135 static struct {
 136         enum spi_signal_type    value;
 137         char                    *name;
 138 } signal_types[] = {
 139         { SPI_SIGNAL_UNKNOWN, "unknown" },
 140         { SPI_SIGNAL_SE, "SE" },
 141         { SPI_SIGNAL_LVD, "LVD" },
 142         { SPI_SIGNAL_HVD, "HVD" },
 143 };
 144
 145 static inline const char *spi_signal_to_string(enum spi_signal_type type)
 146 {
 147         int i;
 148
 149         for (i = 0; i < sizeof(signal_types)/sizeof(signal_types[0]); i++) {
 150                 if (type == signal_types[i].value)
 151                         return signal_types[i].name;
 152         }
 153         return NULL;
 154 }
 155 static inline enum spi_signal_type spi_signal_to_value(const char *name)
 156 {
 157         int i, len;
 158
 159         for (i = 0; i < sizeof(signal_types)/sizeof(signal_types[0]); i++) {
 160                 len =  strlen(signal_types[i].name);
 161                 if (strncmp(name, signal_types[i].name, len) == 0 &&
 162                     (name[len] == '\n' || name[len] == '\0'))
 163                         return signal_types[i].value;
 164         }
 165         return SPI_SIGNAL_UNKNOWN;
 166 }
 167
 168 static int spi_host_setup(struct transport_container *tc, struct device *dev,
 169                           struct class_device *cdev)
 170 {
 171         struct Scsi_Host *shost = dev_to_shost(dev);
 172
 173         spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
 174
 175         return 0;
 176 }
 177
 178 static DECLARE_TRANSPORT_CLASS(spi_host_class,
 179                                "spi_host",
 180                                spi_host_setup,
 181                                NULL,
 182                                NULL);
 183
 184 static int spi_host_match(struct attribute_container *cont,
 185                           struct device *dev)
 186 {
 187         struct Scsi_Host *shost;
 188         struct spi_internal *i;
 189
 190         if (!scsi_is_host_device(dev))
 191                 return 0;
 192
 193         shost = dev_to_shost(dev);
 194         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 195             != &spi_host_class.class)
 196                 return 0;
 197
 198         i = to_spi_internal(shost->transportt);
 199
 200         return &i->t.host_attrs.ac == cont;
 201 }
 202
 203 static int spi_device_configure(struct transport_container *tc,
 204                                 struct device *dev,
 205                                 struct class_device *cdev)
 206 {
 207         struct scsi_device *sdev = to_scsi_device(dev);
 208         struct scsi_target *starget = sdev->sdev_target;
 209
 210         /* Populate the target capability fields with the values
 211          * gleaned from the device inquiry */
 212
 213         spi_support_sync(starget) = scsi_device_sync(sdev);
 214         spi_support_wide(starget) = scsi_device_wide(sdev);
 215         spi_support_dt(starget) = scsi_device_dt(sdev);
 216         spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
 217         spi_support_ius(starget) = scsi_device_ius(sdev);
 218         spi_support_qas(starget) = scsi_device_qas(sdev);
 219
 220         return 0;
 221 }
 222
 223 static int spi_setup_transport_attrs(struct transport_container *tc,
 224                                      struct device *dev,
 225                                      struct class_device *cdev)
 226 {
 227         struct scsi_target *starget = to_scsi_target(dev);
 228
 229         spi_period(starget) = -1;       /* illegal value */
 230         spi_min_period(starget) = 0;
 231         spi_offset(starget) = 0;        /* async */
 232         spi_max_offset(starget) = 255;
 233         spi_width(starget) = 0; /* narrow */
 234         spi_max_width(starget) = 1;
 235         spi_iu(starget) = 0;    /* no IU */
 236         spi_dt(starget) = 0;    /* ST */
 237         spi_qas(starget) = 0;
 238         spi_wr_flow(starget) = 0;
 239         spi_rd_strm(starget) = 0;
 240         spi_rti(starget) = 0;
 241         spi_pcomp_en(starget) = 0;
 242         spi_hold_mcs(starget) = 0;
 243         spi_dv_pending(starget) = 0;
 244         spi_initial_dv(starget) = 0;
 245         init_MUTEX(&spi_dv_sem(starget));
 246
 247         return 0;
 248 }
 249
 250 #define spi_transport_show_simple(field, format_string)                 \
 251                                                                         \
 252 static ssize_t                                                          \
 253 show_spi_transport_##field(struct class_device *cdev, char *buf)        \
 254 {                                                                       \
 255         struct scsi_target *starget = transport_class_to_starget(cdev); \
 256         struct spi_transport_attrs *tp;                                 \
 257                                                                         \
 258         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 259         return snprintf(buf, 20, format_string, tp->field);             \
 260 }
 261
 262 #define spi_transport_store_simple(field, format_string)                \
 263                                                                         \
 264 static ssize_t                                                          \
 265 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
 266                             size_t count)                               \
 267 {                                                                       \
 268         int val;                                                        \
 269         struct scsi_target *starget = transport_class_to_starget(cdev); \
 270         struct spi_transport_attrs *tp;                                 \
 271                                                                         \
 272         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 273         val = simple_strtoul(buf, NULL, 0);                             \
 274         tp->field = val;                                                \
 275         return count;                                                   \
 276 }
 277
 278 #define spi_transport_show_function(field, format_string)               \
 279                                                                         \
 280 static ssize_t                                                          \
 281 show_spi_transport_##field(struct class_device *cdev, char *buf)        \
 282 {                                                                       \
 283         struct scsi_target *starget = transport_class_to_starget(cdev); \
 284         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 285         struct spi_transport_attrs *tp;                                 \
 286         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 287         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 288         if (i->f->get_##field)                                          \
 289                 i->f->get_##field(starget);                             \
 290         return snprintf(buf, 20, format_string, tp->field);             \
 291 }
 292
 293 #define spi_transport_store_function(field, format_string)              \
 294 static ssize_t                                                          \
 295 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
 296                             size_t count)                               \
 297 {                                                                       \
 298         int val;                                                        \
 299         struct scsi_target *starget = transport_class_to_starget(cdev); \
 300         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 301         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 302                                                                         \
 303         val = simple_strtoul(buf, NULL, 0);                             \
 304         i->f->set_##field(starget, val);                        \
 305         return count;                                                   \
 306 }
 307
 308 #define spi_transport_store_max(field, format_string)                   \
 309 static ssize_t                                                          \
 310 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
 311                             size_t count)                               \
 312 {                                                                       \
 313         int val;                                                        \
 314         struct scsi_target *starget = transport_class_to_starget(cdev); \
 315         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 316         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 317         struct spi_transport_attrs *tp                                  \
 318                 = (struct spi_transport_attrs *)&starget->starget_data; \
 319                                                                         \
 320         val = simple_strtoul(buf, NULL, 0);                             \
 321         if (val > tp->max_##field)                                      \
 322                 val = tp->max_##field;                                  \
 323         i->f->set_##field(starget, val);                                \
 324         return count;                                                   \
 325 }
 326
 327 #define spi_transport_rd_attr(field, format_string)                     \
 328         spi_transport_show_function(field, format_string)               \
 329         spi_transport_store_function(field, format_string)              \
 330 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,                      \
 331                          show_spi_transport_##field,                    \
 332                          store_spi_transport_##field);
 333
 334 #define spi_transport_simple_attr(field, format_string)                 \
 335         spi_transport_show_simple(field, format_string)                 \
 336         spi_transport_store_simple(field, format_string)                \
 337 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,                      \
 338                          show_spi_transport_##field,                    \
 339                          store_spi_transport_##field);
 340
 341 #define spi_transport_max_attr(field, format_string)                    \
 342         spi_transport_show_function(field, format_string)               \
 343         spi_transport_store_max(field, format_string)                   \
 344         spi_transport_simple_attr(max_##field, format_string)           \
 345 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,                      \
 346                          show_spi_transport_##field,                    \
 347                          store_spi_transport_##field);
 348
 349 /* The Parallel SCSI Tranport Attributes: */
 350 spi_transport_max_attr(offset, "%d\n");
 351 spi_transport_max_attr(width, "%d\n");
 352 spi_transport_rd_attr(iu, "%d\n");
 353 spi_transport_rd_attr(dt, "%d\n");
 354 spi_transport_rd_attr(qas, "%d\n");
 355 spi_transport_rd_attr(wr_flow, "%d\n");
 356 spi_transport_rd_attr(rd_strm, "%d\n");
 357 spi_transport_rd_attr(rti, "%d\n");
 358 spi_transport_rd_attr(pcomp_en, "%d\n");
 359 spi_transport_rd_attr(hold_mcs, "%d\n");
 360
 361 /* we only care about the first child device so we return 1 */
 362 static int child_iter(struct device *dev, void *data)
 363 {
 364         struct scsi_device *sdev = to_scsi_device(dev);
 365
 366         spi_dv_device(sdev);
 367         return 1;
 368 }
 369
 370 static ssize_t
 371 store_spi_revalidate(struct class_device *cdev, const char *buf, size_t count)
 372 {
 373         struct scsi_target *starget = transport_class_to_starget(cdev);
 374
 375         device_for_each_child(&starget->dev, NULL, child_iter);
 376         return count;
 377 }
 378 static CLASS_DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
 379
 380 /* Translate the period into ns according to the current spec
 381  * for SDTR/PPR messages */
 382 static ssize_t
 383 show_spi_transport_period_helper(struct class_device *cdev, char *buf,
 384                                  int period)
 385 {
 386         int len, picosec;
 387
 388         if (period < 0 || period > 0xff) {
 389                 picosec = -1;
 390         } else if (period <= SPI_STATIC_PPR) {
 391                 picosec = ppr_to_ps[period];
 392         } else {
 393                 picosec = period * 4000;
 394         }
 395
 396         if (picosec == -1) {
 397                 len = sprintf(buf, "reserved");
 398         } else {
 399                 len = sprint_frac(buf, picosec, 1000);
 400         }
 401
 402         buf[len++] = '\n';
 403         buf[len] = '\0';
 404         return len;
 405 }
 406
 407 static ssize_t
 408 store_spi_transport_period_helper(struct class_device *cdev, const char *buf,
 409                                   size_t count, int *periodp)
 410 {
 411         int j, picosec, period = -1;
 412         char *endp;
 413
 414         picosec = simple_strtoul(buf, &endp, 10) * 1000;
 415         if (*endp == '.') {
 416                 int mult = 100;
 417                 do {
 418                         endp++;
 419                         if (!isdigit(*endp))
 420                                 break;
 421                         picosec += (*endp - '0') * mult;
 422                         mult /= 10;
 423                 } while (mult > 0);
 424         }
 425
 426         for (j = 0; j <= SPI_STATIC_PPR; j++) {
 427                 if (ppr_to_ps[j] < picosec)
 428                         continue;
 429                 period = j;
 430                 break;
 431         }
 432
 433         if (period == -1)
 434                 period = picosec / 4000;
 435
 436         if (period > 0xff)
 437                 period = 0xff;
 438
 439         *periodp = period;
 440
 441         return count;
 442 }
 443
 444 static ssize_t
 445 show_spi_transport_period(struct class_device *cdev, char *buf)
 446 {
 447         struct scsi_target *starget = transport_class_to_starget(cdev);
 448         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 449         struct spi_internal *i = to_spi_internal(shost->transportt);
 450         struct spi_transport_attrs *tp =
 451                 (struct spi_transport_attrs *)&starget->starget_data;
 452
 453         if (i->f->get_period)
 454                 i->f->get_period(starget);
 455
 456         return show_spi_transport_period_helper(cdev, buf, tp->period);
 457 }
 458
 459 static ssize_t
 460 store_spi_transport_period(struct class_device *cdev, const char *buf,
 461                             size_t count)
 462 {
 463         struct scsi_target *starget = transport_class_to_starget(cdev);
 464         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 465         struct spi_internal *i = to_spi_internal(shost->transportt);
 466         struct spi_transport_attrs *tp =
 467                 (struct spi_transport_attrs *)&starget->starget_data;
 468         int period, retval;
 469
 470         retval = store_spi_transport_period_helper(cdev, buf, count, &period);
 471
 472         if (period < tp->min_period)
 473                 period = tp->min_period;
 474
 475         i->f->set_period(starget, period);
 476
 477         return retval;
 478 }
 479
 480 static CLASS_DEVICE_ATTR(period, S_IRUGO | S_IWUSR,
 481                          show_spi_transport_period,
 482                          store_spi_transport_period);
 483
 484 static ssize_t
 485 show_spi_transport_min_period(struct class_device *cdev, char *buf)
 486 {
 487         struct scsi_target *starget = transport_class_to_starget(cdev);
 488         struct spi_transport_attrs *tp =
 489                 (struct spi_transport_attrs *)&starget->starget_data;
 490
 491         return show_spi_transport_period_helper(cdev, buf, tp->min_period);
 492 }
 493
 494 static ssize_t
 495 store_spi_transport_min_period(struct class_device *cdev, const char *buf,
 496                             size_t count)
 497 {
 498         struct scsi_target *starget = transport_class_to_starget(cdev);
 499         struct spi_transport_attrs *tp =
 500                 (struct spi_transport_attrs *)&starget->starget_data;
 501
 502         return store_spi_transport_period_helper(cdev, buf, count,
 503                                                  &tp->min_period);
 504 }
 505
 506
 507 static CLASS_DEVICE_ATTR(min_period, S_IRUGO | S_IWUSR,
 508                          show_spi_transport_min_period,
 509                          store_spi_transport_min_period);
 510
 511
 512 static ssize_t show_spi_host_signalling(struct class_device *cdev, char *buf)
 513 {
 514         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 515         struct spi_internal *i = to_spi_internal(shost->transportt);
 516
 517         if (i->f->get_signalling)
 518                 i->f->get_signalling(shost);
 519
 520         return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
 521 }
 522 static ssize_t store_spi_host_signalling(struct class_device *cdev,
 523                                          const char *buf, size_t count)
 524 {
 525         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 526         struct spi_internal *i = to_spi_internal(shost->transportt);
 527         enum spi_signal_type type = spi_signal_to_value(buf);
 528
 529         if (type != SPI_SIGNAL_UNKNOWN)
 530                 i->f->set_signalling(shost, type);
 531
 532         return count;
 533 }
 534 static CLASS_DEVICE_ATTR(signalling, S_IRUGO | S_IWUSR,
 535                          show_spi_host_signalling,
 536                          store_spi_host_signalling);
 537
 538 #define DV_SET(x, y)                    \
 539         if(i->f->set_##x)               \
 540                 i->f->set_##x(sdev->sdev_target, y)
 541
 542 enum spi_compare_returns {
 543         SPI_COMPARE_SUCCESS,
 544         SPI_COMPARE_FAILURE,
 545         SPI_COMPARE_SKIP_TEST,
 546 };
 547
 548
 549 /* This is for read/write Domain Validation:  If the device supports
 550  * an echo buffer, we do read/write tests to it */
 551 static enum spi_compare_returns
 552 spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,
 553                           u8 *ptr, const int retries)
 554 {
 555         int len = ptr - buffer;
 556         int j, k, r, result;
 557         unsigned int pattern = 0x0000ffff;
 558         struct scsi_sense_hdr sshdr;
 559
 560         const char spi_write_buffer[] = {
 561                 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 562         };
 563         const char spi_read_buffer[] = {
 564                 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 565         };
 566
 567         /* set up the pattern buffer.  Doesn't matter if we spill
 568          * slightly beyond since that's where the read buffer is */
 569         for (j = 0; j < len; ) {
 570
 571                 /* fill the buffer with counting (test a) */
 572                 for ( ; j < min(len, 32); j++)
 573                         buffer[j] = j;
 574                 k = j;
 575                 /* fill the buffer with alternating words of 0x0 and
 576                  * 0xffff (test b) */
 577                 for ( ; j < min(len, k + 32); j += 2) {
 578                         u16 *word = (u16 *)&buffer[j];
 579
 580                         *word = (j & 0x02) ? 0x0000 : 0xffff;
 581                 }
 582                 k = j;
 583                 /* fill with crosstalk (alternating 0x5555 0xaaa)
 584                  * (test c) */
 585                 for ( ; j < min(len, k + 32); j += 2) {
 586                         u16 *word = (u16 *)&buffer[j];
 587
 588                         *word = (j & 0x02) ? 0x5555 : 0xaaaa;
 589                 }
 590                 k = j;
 591                 /* fill with shifting bits (test d) */
 592                 for ( ; j < min(len, k + 32); j += 4) {
 593                         u32 *word = (unsigned int *)&buffer[j];
 594                         u32 roll = (pattern & 0x80000000) ? 1 : 0;
 595
 596                         *word = pattern;
 597                         pattern = (pattern << 1) | roll;
 598                 }
 599                 /* don't bother with random data (test e) */
 600         }
 601
 602         for (r = 0; r < retries; r++) {
 603                 result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE,
 604                                      buffer, len, &sshdr);
 605                 if(result || !scsi_device_online(sdev)) {
 606
 607                         scsi_device_set_state(sdev, SDEV_QUIESCE);
 608                         if (scsi_sense_valid(&sshdr)
 609                             && sshdr.sense_key == ILLEGAL_REQUEST
 610                             /* INVALID FIELD IN CDB */
 611                             && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
 612                                 /* This would mean that the drive lied
 613                                  * to us about supporting an echo
 614                                  * buffer (unfortunately some Western
 615                                  * Digital drives do precisely this)
 616                                  */
 617                                 return SPI_COMPARE_SKIP_TEST;
 618
 619
 620                         sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
 621                         return SPI_COMPARE_FAILURE;
 622                 }
 623
 624                 memset(ptr, 0, len);
 625                 spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE,
 626                             ptr, len, NULL);
 627                 scsi_device_set_state(sdev, SDEV_QUIESCE);
 628
 629                 if (memcmp(buffer, ptr, len) != 0)
 630                         return SPI_COMPARE_FAILURE;
 631         }
 632         return SPI_COMPARE_SUCCESS;
 633 }
 634
 635 /* This is for the simplest form of Domain Validation: a read test
 636  * on the inquiry data from the device */
 637 static enum spi_compare_returns
 638 spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,
 639                               u8 *ptr, const int retries)
 640 {
 641         int r, result;
 642         const int len = sdev->inquiry_len;
 643         const char spi_inquiry[] = {
 644                 INQUIRY, 0, 0, 0, len, 0
 645         };
 646
 647         for (r = 0; r < retries; r++) {
 648                 memset(ptr, 0, len);
 649
 650                 result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE,
 651                                      ptr, len, NULL);
 652
 653                 if(result || !scsi_device_online(sdev)) {
 654                         scsi_device_set_state(sdev, SDEV_QUIESCE);
 655                         return SPI_COMPARE_FAILURE;
 656                 }
 657
 658                 /* If we don't have the inquiry data already, the
 659                  * first read gets it */
 660                 if (ptr == buffer) {
 661                         ptr += len;
 662                         --r;
 663                         continue;
 664                 }
 665
 666                 if (memcmp(buffer, ptr, len) != 0)
 667                         /* failure */
 668                         return SPI_COMPARE_FAILURE;
 669         }
 670         return SPI_COMPARE_SUCCESS;
 671 }
 672
 673 static enum spi_compare_returns
 674 spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,
 675                enum spi_compare_returns
 676                (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
 677 {
 678         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 679         struct scsi_target *starget = sdev->sdev_target;
 680         int period = 0, prevperiod = 0;
 681         enum spi_compare_returns retval;
 682
 683
 684         for (;;) {
 685                 int newperiod;
 686                 retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
 687
 688                 if (retval == SPI_COMPARE_SUCCESS
 689                     || retval == SPI_COMPARE_SKIP_TEST)
 690                         break;
 691
 692                 /* OK, retrain, fallback */
 693                 if (i->f->get_iu)
 694                         i->f->get_iu(starget);
 695                 if (i->f->get_qas)
 696                         i->f->get_qas(starget);
 697                 if (i->f->get_period)
 698                         i->f->get_period(sdev->sdev_target);
 699
 700                 /* Here's the fallback sequence; first try turning off
 701                  * IU, then QAS (if we can control them), then finally
 702                  * fall down the periods */
 703                 if (i->f->set_iu && spi_iu(starget)) {
 704                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n");
 705                         DV_SET(iu, 0);
 706                 } else if (i->f->set_qas && spi_qas(starget)) {
 707                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n");
 708                         DV_SET(qas, 0);
 709                 } else {
 710                         newperiod = spi_period(starget);
 711                         period = newperiod > period ? newperiod : period;
 712                         if (period < 0x0d)
 713                                 period++;
 714                         else
 715                                 period += period >> 1;
 716
 717                         if (unlikely(period > 0xff || period == prevperiod)) {
 718                                 /* Total failure; set to async and return */
 719                                 starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
 720                                 DV_SET(offset, 0);
 721                                 return SPI_COMPARE_FAILURE;
 722                         }
 723                         starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");
 724                         DV_SET(period, period);
 725                         prevperiod = period;
 726                 }
 727         }
 728         return retval;
 729 }
 730
 731 static int
 732 spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)
 733 {
 734         int l, result;
 735
 736         /* first off do a test unit ready.  This can error out
 737          * because of reservations or some other reason.  If it
 738          * fails, the device won't let us write to the echo buffer
 739          * so just return failure */
 740
 741         const char spi_test_unit_ready[] = {
 742                 TEST_UNIT_READY, 0, 0, 0, 0, 0
 743         };
 744
 745         const char spi_read_buffer_descriptor[] = {
 746                 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
 747         };
 748
 749
 750         /* We send a set of three TURs to clear any outstanding
 751          * unit attention conditions if they exist (Otherwise the
 752          * buffer tests won't be happy).  If the TUR still fails
 753          * (reservation conflict, device not ready, etc) just
 754          * skip the write tests */
 755         for (l = 0; ; l++) {
 756                 result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE,
 757                                      NULL, 0, NULL);
 758
 759                 if(result) {
 760                         if(l >= 3)
 761                                 return 0;
 762                 } else {
 763                         /* TUR succeeded */
 764                         break;
 765                 }
 766         }
 767
 768         result = spi_execute(sdev, spi_read_buffer_descriptor,
 769                              DMA_FROM_DEVICE, buffer, 4, NULL);
 770
 771         if (result)
 772                 /* Device has no echo buffer */
 773                 return 0;
 774
 775         return buffer[3] + ((buffer[2] & 0x1f) << 8);
 776 }
 777
 778 static void
 779 spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
 780 {
 781         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 782         struct scsi_target *starget = sdev->sdev_target;
 783         int len = sdev->inquiry_len;
 784         /* first set us up for narrow async */
 785         DV_SET(offset, 0);
 786         DV_SET(width, 0);
 787
 788         if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
 789             != SPI_COMPARE_SUCCESS) {
 790                 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
 791                 /* FIXME: should probably offline the device here? */
 792                 return;
 793         }
 794
 795         /* test width */
 796         if (i->f->set_width && spi_max_width(starget) &&
 797             scsi_device_wide(sdev)) {
 798                 i->f->set_width(starget, 1);
 799
 800                 if (spi_dv_device_compare_inquiry(sdev, buffer,
 801                                                    buffer + len,
 802                                                    DV_LOOPS)
 803                     != SPI_COMPARE_SUCCESS) {
 804                         starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
 805                         i->f->set_width(starget, 0);
 806                 }
 807         }
 808
 809         if (!i->f->set_period)
 810                 return;
 811
 812         /* device can't handle synchronous */
 813         if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev))
 814                 return;
 815
 816         /* len == -1 is the signal that we need to ascertain the
 817          * presence of an echo buffer before trying to use it.  len ==
 818          * 0 means we don't have an echo buffer */
 819         len = -1;
 820
 821  retry:
 822
 823         /* now set up to the maximum */
 824         DV_SET(offset, spi_max_offset(starget));
 825         DV_SET(period, spi_min_period(starget));
 826         /* try QAS requests; this should be harmless to set if the
 827          * target supports it */
 828         if (scsi_device_qas(sdev))
 829                 DV_SET(qas, 1);
 830         /* Also try IU transfers */
 831         if (scsi_device_ius(sdev))
 832                 DV_SET(iu, 1);
 833         if (spi_min_period(starget) < 9) {
 834                 /* This u320 (or u640). Ignore the coupled parameters
 835                  * like DT and IU, but set the optional ones */
 836                 DV_SET(rd_strm, 1);
 837                 DV_SET(wr_flow, 1);
 838                 DV_SET(rti, 1);
 839                 if (spi_min_period(starget) == 8)
 840                         DV_SET(pcomp_en, 1);
 841         }
 842         /* Do the read only INQUIRY tests */
 843         spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
 844                        spi_dv_device_compare_inquiry);
 845         /* See if we actually managed to negotiate and sustain DT */
 846         if (i->f->get_dt)
 847                 i->f->get_dt(starget);
 848
 849         /* see if the device has an echo buffer.  If it does we can do
 850          * the SPI pattern write tests.  Because of some broken
 851          * devices, we *only* try this on a device that has actually
 852          * negotiated DT */
 853
 854         if (len == -1 && spi_dt(starget))
 855                 len = spi_dv_device_get_echo_buffer(sdev, buffer);
 856
 857         if (len <= 0) {
 858                 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
 859                 return;
 860         }
 861
 862         if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
 863                 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
 864                 len = SPI_MAX_ECHO_BUFFER_SIZE;
 865         }
 866
 867         if (spi_dv_retrain(sdev, buffer, buffer + len,
 868                            spi_dv_device_echo_buffer)
 869             == SPI_COMPARE_SKIP_TEST) {
 870                 /* OK, the stupid drive can't do a write echo buffer
 871                  * test after all, fall back to the read tests */
 872                 len = 0;
 873                 goto retry;
 874         }
 875 }
 876
 877
 878 /**     spi_dv_device - Do Domain Validation on the device
 879  *      @sdev:          scsi device to validate
 880  *
 881  *      Performs the domain validation on the given device in the
 882  *      current execution thread.  Since DV operations may sleep,
 883  *      the current thread must have user context.  Also no SCSI
 884  *      related locks that would deadlock I/O issued by the DV may
 885  *      be held.
 886  */
 887 void
 888 spi_dv_device(struct scsi_device *sdev)
 889 {
 890         struct scsi_target *starget = sdev->sdev_target;
 891         u8 *buffer;
 892         const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
 893
 894         if (unlikely(scsi_device_get(sdev)))
 895                 return;
 896
 897         buffer = kmalloc(len, GFP_KERNEL);
 898
 899         if (unlikely(!buffer))
 900                 goto out_put;
 901
 902         memset(buffer, 0, len);
 903
 904         /* We need to verify that the actual device will quiesce; the
 905          * later target quiesce is just a nice to have */
 906         if (unlikely(scsi_device_quiesce(sdev)))
 907                 goto out_free;
 908
 909         scsi_target_quiesce(starget);
 910
 911         spi_dv_pending(starget) = 1;
 912         down(&spi_dv_sem(starget));
 913
 914         starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
 915
 916         spi_dv_device_internal(sdev, buffer);
 917
 918         starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
 919
 920         up(&spi_dv_sem(starget));
 921         spi_dv_pending(starget) = 0;
 922
 923         scsi_target_resume(starget);
 924
 925         spi_initial_dv(starget) = 1;
 926
 927  out_free:
 928         kfree(buffer);
 929  out_put:
 930         scsi_device_put(sdev);
 931 }
 932 EXPORT_SYMBOL(spi_dv_device);
 933
 934 struct work_queue_wrapper {
 935         struct work_struct      work;
 936         struct scsi_device      *sdev;
 937 };
 938
 939 static void
 940 spi_dv_device_work_wrapper(void *data)
 941 {
 942         struct work_queue_wrapper *wqw = (struct work_queue_wrapper *)data;
 943         struct scsi_device *sdev = wqw->sdev;
 944
 945         kfree(wqw);
 946         spi_dv_device(sdev);
 947         spi_dv_pending(sdev->sdev_target) = 0;
 948         scsi_device_put(sdev);
 949 }
 950
 951
 952 /**
 953  *      spi_schedule_dv_device - schedule domain validation to occur on the device
 954  *      @sdev:  The device to validate
 955  *
 956  *      Identical to spi_dv_device() above, except that the DV will be
 957  *      scheduled to occur in a workqueue later.  All memory allocations
 958  *      are atomic, so may be called from any context including those holding
 959  *      SCSI locks.
 960  */
 961 void
 962 spi_schedule_dv_device(struct scsi_device *sdev)
 963 {
 964         struct work_queue_wrapper *wqw =
 965                 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
 966
 967         if (unlikely(!wqw))
 968                 return;
 969
 970         if (unlikely(spi_dv_pending(sdev->sdev_target))) {
 971                 kfree(wqw);
 972                 return;
 973         }
 974         /* Set pending early (dv_device doesn't check it, only sets it) */
 975         spi_dv_pending(sdev->sdev_target) = 1;
 976         if (unlikely(scsi_device_get(sdev))) {
 977                 kfree(wqw);
 978                 spi_dv_pending(sdev->sdev_target) = 0;
 979                 return;
 980         }
 981
 982         INIT_WORK(&wqw->work, spi_dv_device_work_wrapper, wqw);
 983         wqw->sdev = sdev;
 984
 985         schedule_work(&wqw->work);
 986 }
 987 EXPORT_SYMBOL(spi_schedule_dv_device);
 988
 989 /**
 990  * spi_display_xfer_agreement - Print the current target transfer agreement
 991  * @starget: The target for which to display the agreement
 992  *
 993  * Each SPI port is required to maintain a transfer agreement for each
 994  * other port on the bus.  This function prints a one-line summary of
 995  * the current agreement; more detailed information is available in sysfs.
 996  */
 997 void spi_display_xfer_agreement(struct scsi_target *starget)
 998 {
 999         struct spi_transport_attrs *tp;
1000         tp = (struct spi_transport_attrs *)&starget->starget_data;
1001
1002         if (tp->offset > 0 && tp->period > 0) {
1003                 unsigned int picosec, kb100;
1004                 char *scsi = "FAST-?";
1005                 char tmp[8];
1006
1007                 if (tp->period <= SPI_STATIC_PPR) {
1008                         picosec = ppr_to_ps[tp->period];
1009                         switch (tp->period) {
1010                                 case  7: scsi = "FAST-320"; break;
1011                                 case  8: scsi = "FAST-160"; break;
1012                                 case  9: scsi = "FAST-80"; break;
1013                                 case 10:
1014                                 case 11: scsi = "FAST-40"; break;
1015                                 case 12: scsi = "FAST-20"; break;
1016                         }
1017                 } else {
1018                         picosec = tp->period * 4000;
1019                         if (tp->period < 25)
1020                                 scsi = "FAST-20";
1021                         else if (tp->period < 50)
1022                                 scsi = "FAST-10";
1023                         else
1024                                 scsi = "FAST-5";
1025                 }
1026
1027                 kb100 = (10000000 + picosec / 2) / picosec;
1028                 if (tp->width)
1029                         kb100 *= 2;
1030                 sprint_frac(tmp, picosec, 1000);
1031
1032                 dev_info(&starget->dev,
1033                          "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1034                          scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1035                          tp->dt ? "DT" : "ST",
1036                          tp->iu ? " IU" : "",
1037                          tp->qas  ? " QAS" : "",
1038                          tp->rd_strm ? " RDSTRM" : "",
1039                          tp->rti ? " RTI" : "",
1040                          tp->wr_flow ? " WRFLOW" : "",
1041                          tp->pcomp_en ? " PCOMP" : "",
1042                          tp->hold_mcs ? " HMCS" : "",
1043                          tmp, tp->offset);
1044         } else {
1045                 dev_info(&starget->dev, "%sasynchronous\n",
1046                                 tp->width ? "wide " : "");
1047         }
1048 }
1049 EXPORT_SYMBOL(spi_display_xfer_agreement);
1050
1051 #ifdef CONFIG_SCSI_CONSTANTS
1052 static const char * const one_byte_msgs[] = {
1053 /* 0x00 */ "Command Complete", NULL, "Save Pointers",
1054 /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error",
1055 /* 0x06 */ "Abort", "Message Reject", "Nop", "Message Parity Error",
1056 /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1057 /* 0x0c */ "Bus device reset", "Abort Tag", "Clear Queue",
1058 /* 0x0f */ "Initiate Recovery", "Release Recovery"
1059 };
1060 #define NO_ONE_BYTE_MSGS (sizeof(one_byte_msgs)  / sizeof (const char *))
1061
1062 static const char * const two_byte_msgs[] = {
1063 /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag"
1064 /* 0x23 */ "Ignore Wide Residue"
1065 };
1066 #define NO_TWO_BYTE_MSGS (sizeof(two_byte_msgs)  / sizeof (const char *))
1067
1068 static const char * const extended_msgs[] = {
1069 /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1070 /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request"
1071 };
1072 #define NO_EXTENDED_MSGS (sizeof(two_byte_msgs)  / sizeof (const char *))
1073
1074
1075 int spi_print_msg(const unsigned char *msg)
1076 {
1077         int len = 0, i;
1078         if (msg[0] == EXTENDED_MESSAGE) {
1079                 len = 3 + msg[1];
1080                 if (msg[2] < NO_EXTENDED_MSGS)
1081                         printk ("%s ", extended_msgs[msg[2]]);
1082                 else
1083                         printk ("Extended Message, reserved code (0x%02x) ",
1084                                 (int) msg[2]);
1085                 switch (msg[2]) {
1086                 case EXTENDED_MODIFY_DATA_POINTER:
1087                         printk("pointer = %d", (int) (msg[3] << 24) |
1088                                 (msg[4] << 16) | (msg[5] << 8) | msg[6]);
1089                         break;
1090                 case EXTENDED_SDTR:
1091                         printk("period = %d ns, offset = %d",
1092                                 (int) msg[3] * 4, (int) msg[4]);
1093                         break;
1094                 case EXTENDED_WDTR:
1095                         printk("width = 2^%d bytes", msg[3]);
1096                         break;
1097                 default:
1098                 for (i = 2; i < len; ++i)
1099                         printk("%02x ", msg[i]);
1100                 }
1101         /* Identify */
1102         } else if (msg[0] & 0x80) {
1103                 printk("Identify disconnect %sallowed %s %d ",
1104                         (msg[0] & 0x40) ? "" : "not ",
1105                         (msg[0] & 0x20) ? "target routine" : "lun",
1106                         msg[0] & 0x7);
1107                 len = 1;
1108         /* Normal One byte */
1109         } else if (msg[0] < 0x1f) {
1110                 if (msg[0] < NO_ONE_BYTE_MSGS)
1111                         printk(one_byte_msgs[msg[0]]);
1112                 else
1113                         printk("reserved (%02x) ", msg[0]);
1114                 len = 1;
1115         /* Two byte */
1116         } else if (msg[0] <= 0x2f) {
1117                 if ((msg[0] - 0x20) < NO_TWO_BYTE_MSGS)
1118                         printk("%s %02x ", two_byte_msgs[msg[0] - 0x20],
1119                                 msg[1]);
1120                 else
1121                         printk("reserved two byte (%02x %02x) ",
1122                                 msg[0], msg[1]);
1123                 len = 2;
1124         } else
1125                 printk("reserved");
1126         return len;
1127 }
1128 EXPORT_SYMBOL(spi_print_msg);
1129
1130 #else  /* ifndef CONFIG_SCSI_CONSTANTS */
1131
1132 int spi_print_msg(const unsigned char *msg)
1133 {
1134         int len = 0, i;
1135
1136         if (msg[0] == EXTENDED_MESSAGE) {
1137                 len = 3 + msg[1];
1138                 for (i = 0; i < len; ++i)
1139                         printk("%02x ", msg[i]);
1140         /* Identify */
1141         } else if (msg[0] & 0x80) {
1142                 printk("%02x ", msg[0]);
1143                 len = 1;
1144         /* Normal One byte */
1145         } else if (msg[0] < 0x1f) {
1146                 printk("%02x ", msg[0]);
1147                 len = 1;
1148         /* Two byte */
1149         } else if (msg[0] <= 0x2f) {
1150                 printk("%02x %02x", msg[0], msg[1]);
1151                 len = 2;
1152         } else
1153                 printk("%02x ", msg[0]);
1154         return len;
1155 }
1156 EXPORT_SYMBOL(spi_print_msg);
1157 #endif /* ! CONFIG_SCSI_CONSTANTS */
1158
1159 #define SETUP_ATTRIBUTE(field)                                          \
1160         i->private_attrs[count] = class_device_attr_##field;            \
1161         if (!i->f->set_##field) {                                       \
1162                 i->private_attrs[count].attr.mode = S_IRUGO;            \
1163                 i->private_attrs[count].store = NULL;                   \
1164         }                                                               \
1165         i->attrs[count] = &i->private_attrs[count];                     \
1166         if (i->f->show_##field)                                         \
1167                 count++
1168
1169 #define SETUP_RELATED_ATTRIBUTE(field, rel_field)                       \
1170         i->private_attrs[count] = class_device_attr_##field;            \
1171         if (!i->f->set_##rel_field) {                                   \
1172                 i->private_attrs[count].attr.mode = S_IRUGO;            \
1173                 i->private_attrs[count].store = NULL;                   \
1174         }                                                               \
1175         i->attrs[count] = &i->private_attrs[count];                     \
1176         if (i->f->show_##rel_field)                                     \
1177                 count++
1178
1179 #define SETUP_HOST_ATTRIBUTE(field)                                     \
1180         i->private_host_attrs[count] = class_device_attr_##field;       \
1181         if (!i->f->set_##field) {                                       \
1182                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1183                 i->private_host_attrs[count].store = NULL;              \
1184         }                                                               \
1185         i->host_attrs[count] = &i->private_host_attrs[count];           \
1186         count++
1187
1188 static int spi_device_match(struct attribute_container *cont,
1189                             struct device *dev)
1190 {
1191         struct scsi_device *sdev;
1192         struct Scsi_Host *shost;
1193         struct spi_internal *i;
1194
1195         if (!scsi_is_sdev_device(dev))
1196                 return 0;
1197
1198         sdev = to_scsi_device(dev);
1199         shost = sdev->host;
1200         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1201             != &spi_host_class.class)
1202                 return 0;
1203         /* Note: this class has no device attributes, so it has
1204          * no per-HBA allocation and thus we don't need to distinguish
1205          * the attribute containers for the device */
1206         i = to_spi_internal(shost->transportt);
1207         if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1208                 return 0;
1209         return 1;
1210 }
1211
1212 static int spi_target_match(struct attribute_container *cont,
1213                             struct device *dev)
1214 {
1215         struct Scsi_Host *shost;
1216         struct scsi_target *starget;
1217         struct spi_internal *i;
1218
1219         if (!scsi_is_target_device(dev))
1220                 return 0;
1221
1222         shost = dev_to_shost(dev->parent);
1223         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1224             != &spi_host_class.class)
1225                 return 0;
1226
1227         i = to_spi_internal(shost->transportt);
1228         starget = to_scsi_target(dev);
1229
1230         if (i->f->deny_binding && i->f->deny_binding(starget))
1231                 return 0;
1232
1233         return &i->t.target_attrs.ac == cont;
1234 }
1235
1236 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1237                                "spi_transport",
1238                                spi_setup_transport_attrs,
1239                                NULL,
1240                                NULL);
1241
1242 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1243                                     spi_device_match,
1244                                     spi_device_configure);
1245
1246 struct scsi_transport_template *
1247 spi_attach_transport(struct spi_function_template *ft)
1248 {
1249         struct spi_internal *i = kmalloc(sizeof(struct spi_internal),
1250                                          GFP_KERNEL);
1251         int count = 0;
1252         if (unlikely(!i))
1253                 return NULL;
1254
1255         memset(i, 0, sizeof(struct spi_internal));
1256
1257
1258         i->t.target_attrs.ac.class = &spi_transport_class.class;
1259         i->t.target_attrs.ac.attrs = &i->attrs[0];
1260         i->t.target_attrs.ac.match = spi_target_match;
1261         transport_container_register(&i->t.target_attrs);
1262         i->t.target_size = sizeof(struct spi_transport_attrs);
1263         i->t.host_attrs.ac.class = &spi_host_class.class;
1264         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1265         i->t.host_attrs.ac.match = spi_host_match;
1266         transport_container_register(&i->t.host_attrs);
1267         i->t.host_size = sizeof(struct spi_host_attrs);
1268         i->f = ft;
1269
1270         SETUP_ATTRIBUTE(period);
1271         SETUP_RELATED_ATTRIBUTE(min_period, period);
1272         SETUP_ATTRIBUTE(offset);
1273         SETUP_RELATED_ATTRIBUTE(max_offset, offset);
1274         SETUP_ATTRIBUTE(width);
1275         SETUP_RELATED_ATTRIBUTE(max_width, width);
1276         SETUP_ATTRIBUTE(iu);
1277         SETUP_ATTRIBUTE(dt);
1278         SETUP_ATTRIBUTE(qas);
1279         SETUP_ATTRIBUTE(wr_flow);
1280         SETUP_ATTRIBUTE(rd_strm);
1281         SETUP_ATTRIBUTE(rti);
1282         SETUP_ATTRIBUTE(pcomp_en);
1283         SETUP_ATTRIBUTE(hold_mcs);
1284
1285         /* if you add an attribute but forget to increase SPI_NUM_ATTRS
1286          * this bug will trigger */
1287         BUG_ON(count > SPI_NUM_ATTRS);
1288
1289         i->attrs[count++] = &class_device_attr_revalidate;
1290
1291         i->attrs[count] = NULL;
1292
1293         count = 0;
1294         SETUP_HOST_ATTRIBUTE(signalling);
1295
1296         BUG_ON(count > SPI_HOST_ATTRS);
1297
1298         i->host_attrs[count] = NULL;
1299
1300         return &i->t;
1301 }
1302 EXPORT_SYMBOL(spi_attach_transport);
1303
1304 void spi_release_transport(struct scsi_transport_template *t)
1305 {
1306         struct spi_internal *i = to_spi_internal(t);
1307
1308         transport_container_unregister(&i->t.target_attrs);
1309         transport_container_unregister(&i->t.host_attrs);
1310
1311         kfree(i);
1312 }
1313 EXPORT_SYMBOL(spi_release_transport);
1314
1315 static __init int spi_transport_init(void)
1316 {
1317         int error = transport_class_register(&spi_transport_class);
1318         if (error)
1319                 return error;
1320         error = anon_transport_class_register(&spi_device_class);
1321         return transport_class_register(&spi_host_class);
1322 }
1323
1324 static void __exit spi_transport_exit(void)
1325 {
1326         transport_class_unregister(&spi_transport_class);
1327         anon_transport_class_unregister(&spi_device_class);
1328         transport_class_unregister(&spi_host_class);
1329 }
1330
1331 MODULE_AUTHOR("Martin Hicks");
1332 MODULE_DESCRIPTION("SPI Transport Attributes");
1333 MODULE_LICENSE("GPL");
1334
1335 module_init(spi_transport_init);
1336 module_exit(spi_transport_exit);