drivers/scsi/scsi_transport_spi.c

   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/ctype.h>
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/blkdev.h>
  26 #include <linux/mutex.h>
  27 #include <linux/sysfs.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_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress)
  51 #define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex)
  52
  53 struct spi_internal {
  54         struct scsi_transport_template t;
  55         struct spi_function_template *f;
  56 };
  57
  58 #define to_spi_internal(tmpl)   container_of(tmpl, struct spi_internal, t)
  59
  60 static const int ppr_to_ps[] = {
  61         /* The PPR values 0-6 are reserved, fill them in when
  62          * the committee defines them */
  63         -1,                     /* 0x00 */
  64         -1,                     /* 0x01 */
  65         -1,                     /* 0x02 */
  66         -1,                     /* 0x03 */
  67         -1,                     /* 0x04 */
  68         -1,                     /* 0x05 */
  69         -1,                     /* 0x06 */
  70          3125,                  /* 0x07 */
  71          6250,                  /* 0x08 */
  72         12500,                  /* 0x09 */
  73         25000,                  /* 0x0a */
  74         30300,                  /* 0x0b */
  75         50000,                  /* 0x0c */
  76 };
  77 /* The PPR values at which you calculate the period in ns by multiplying
  78  * by 4 */
  79 #define SPI_STATIC_PPR  0x0c
  80
  81 static int sprint_frac(char *dest, int value, int denom)
  82 {
  83         int frac = value % denom;
  84         int result = sprintf(dest, "%d", value / denom);
  85
  86         if (frac == 0)
  87                 return result;
  88         dest[result++] = '.';
  89
  90         do {
  91                 denom /= 10;
  92                 sprintf(dest + result, "%d", frac / denom);
  93                 result++;
  94                 frac %= denom;
  95         } while (frac);
  96
  97         dest[result++] = '\0';
  98         return result;
  99 }
 100
 101 static int spi_execute(struct scsi_device *sdev, const void *cmd,
 102                        enum dma_data_direction dir,
 103                        void *buffer, unsigned bufflen,
 104                        struct scsi_sense_hdr *sshdr)
 105 {
 106         int i, result;
 107         unsigned char sense[SCSI_SENSE_BUFFERSIZE];
 108
 109         for(i = 0; i < DV_RETRIES; i++) {
 110                 result = scsi_execute(sdev, cmd, dir, buffer, bufflen,
 111                                       sense, DV_TIMEOUT, /* retries */ 1,
 112                                       REQ_FAILFAST);
 113                 if (result & DRIVER_SENSE) {
 114                         struct scsi_sense_hdr sshdr_tmp;
 115                         if (!sshdr)
 116                                 sshdr = &sshdr_tmp;
 117
 118                         if (scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE,
 119                                                  sshdr)
 120                             && sshdr->sense_key == UNIT_ATTENTION)
 121                                 continue;
 122                 }
 123                 break;
 124         }
 125         return result;
 126 }
 127
 128 static struct {
 129         enum spi_signal_type    value;
 130         char                    *name;
 131 } signal_types[] = {
 132         { SPI_SIGNAL_UNKNOWN, "unknown" },
 133         { SPI_SIGNAL_SE, "SE" },
 134         { SPI_SIGNAL_LVD, "LVD" },
 135         { SPI_SIGNAL_HVD, "HVD" },
 136 };
 137
 138 static inline const char *spi_signal_to_string(enum spi_signal_type type)
 139 {
 140         int i;
 141
 142         for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 143                 if (type == signal_types[i].value)
 144                         return signal_types[i].name;
 145         }
 146         return NULL;
 147 }
 148 static inline enum spi_signal_type spi_signal_to_value(const char *name)
 149 {
 150         int i, len;
 151
 152         for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 153                 len =  strlen(signal_types[i].name);
 154                 if (strncmp(name, signal_types[i].name, len) == 0 &&
 155                     (name[len] == '\n' || name[len] == '\0'))
 156                         return signal_types[i].value;
 157         }
 158         return SPI_SIGNAL_UNKNOWN;
 159 }
 160
 161 static int spi_host_setup(struct transport_container *tc, struct device *dev,
 162                           struct device *cdev)
 163 {
 164         struct Scsi_Host *shost = dev_to_shost(dev);
 165
 166         spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
 167
 168         return 0;
 169 }
 170
 171 static int spi_host_configure(struct transport_container *tc,
 172                               struct device *dev,
 173                               struct device *cdev);
 174
 175 static DECLARE_TRANSPORT_CLASS(spi_host_class,
 176                                "spi_host",
 177                                spi_host_setup,
 178                                NULL,
 179                                spi_host_configure);
 180
 181 static int spi_host_match(struct attribute_container *cont,
 182                           struct device *dev)
 183 {
 184         struct Scsi_Host *shost;
 185
 186         if (!scsi_is_host_device(dev))
 187                 return 0;
 188
 189         shost = dev_to_shost(dev);
 190         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 191             != &spi_host_class.class)
 192                 return 0;
 193
 194         return &shost->transportt->host_attrs.ac == cont;
 195 }
 196
 197 static int spi_target_configure(struct transport_container *tc,
 198                                 struct device *dev,
 199                                 struct device *cdev);
 200
 201 static int spi_device_configure(struct transport_container *tc,
 202                                 struct device *dev,
 203                                 struct device *cdev)
 204 {
 205         struct scsi_device *sdev = to_scsi_device(dev);
 206         struct scsi_target *starget = sdev->sdev_target;
 207
 208         /* Populate the target capability fields with the values
 209          * gleaned from the device inquiry */
 210
 211         spi_support_sync(starget) = scsi_device_sync(sdev);
 212         spi_support_wide(starget) = scsi_device_wide(sdev);
 213         spi_support_dt(starget) = scsi_device_dt(sdev);
 214         spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
 215         spi_support_ius(starget) = scsi_device_ius(sdev);
 216         spi_support_qas(starget) = scsi_device_qas(sdev);
 217
 218         return 0;
 219 }
 220
 221 static int spi_setup_transport_attrs(struct transport_container *tc,
 222                                      struct device *dev,
 223                                      struct device *cdev)
 224 {
 225         struct scsi_target *starget = to_scsi_target(dev);
 226
 227         spi_period(starget) = -1;       /* illegal value */
 228         spi_min_period(starget) = 0;
 229         spi_offset(starget) = 0;        /* async */
 230         spi_max_offset(starget) = 255;
 231         spi_width(starget) = 0; /* narrow */
 232         spi_max_width(starget) = 1;
 233         spi_iu(starget) = 0;    /* no IU */
 234         spi_dt(starget) = 0;    /* ST */
 235         spi_qas(starget) = 0;
 236         spi_wr_flow(starget) = 0;
 237         spi_rd_strm(starget) = 0;
 238         spi_rti(starget) = 0;
 239         spi_pcomp_en(starget) = 0;
 240         spi_hold_mcs(starget) = 0;
 241         spi_dv_pending(starget) = 0;
 242         spi_dv_in_progress(starget) = 0;
 243         spi_initial_dv(starget) = 0;
 244         mutex_init(&spi_dv_mutex(starget));
 245
 246         return 0;
 247 }
 248
 249 #define spi_transport_show_simple(field, format_string)                 \
 250                                                                         \
 251 static ssize_t                                                          \
 252 show_spi_transport_##field(struct device *dev,                  \
 253                            struct device_attribute *attr, char *buf)    \
 254 {                                                                       \
 255         struct scsi_target *starget = transport_class_to_starget(dev);  \
 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 device *dev,                         \
 266                             struct device_attribute *attr,              \
 267                             const char *buf, size_t count)              \
 268 {                                                                       \
 269         int val;                                                        \
 270         struct scsi_target *starget = transport_class_to_starget(dev);  \
 271         struct spi_transport_attrs *tp;                                 \
 272                                                                         \
 273         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 274         val = simple_strtoul(buf, NULL, 0);                             \
 275         tp->field = val;                                                \
 276         return count;                                                   \
 277 }
 278
 279 #define spi_transport_show_function(field, format_string)               \
 280                                                                         \
 281 static ssize_t                                                          \
 282 show_spi_transport_##field(struct device *dev,                  \
 283                            struct device_attribute *attr, char *buf)    \
 284 {                                                                       \
 285         struct scsi_target *starget = transport_class_to_starget(dev);  \
 286         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 287         struct spi_transport_attrs *tp;                                 \
 288         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 289         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 290         if (i->f->get_##field)                                          \
 291                 i->f->get_##field(starget);                             \
 292         return snprintf(buf, 20, format_string, tp->field);             \
 293 }
 294
 295 #define spi_transport_store_function(field, format_string)              \
 296 static ssize_t                                                          \
 297 store_spi_transport_##field(struct device *dev,                         \
 298                             struct device_attribute *attr,              \
 299                             const char *buf, size_t count)              \
 300 {                                                                       \
 301         int val;                                                        \
 302         struct scsi_target *starget = transport_class_to_starget(dev);  \
 303         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 304         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 305                                                                         \
 306         if (!i->f->set_##field)                                         \
 307                 return -EINVAL;                                         \
 308         val = simple_strtoul(buf, NULL, 0);                             \
 309         i->f->set_##field(starget, val);                                \
 310         return count;                                                   \
 311 }
 312
 313 #define spi_transport_store_max(field, format_string)                   \
 314 static ssize_t                                                          \
 315 store_spi_transport_##field(struct device *dev,                         \
 316                             struct device_attribute *attr,              \
 317                             const char *buf, size_t count)              \
 318 {                                                                       \
 319         int val;                                                        \
 320         struct scsi_target *starget = transport_class_to_starget(dev);  \
 321         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 322         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 323         struct spi_transport_attrs *tp                                  \
 324                 = (struct spi_transport_attrs *)&starget->starget_data; \
 325                                                                         \
 326         if (i->f->set_##field)                                          \
 327                 return -EINVAL;                                         \
 328         val = simple_strtoul(buf, NULL, 0);                             \
 329         if (val > tp->max_##field)                                      \
 330                 val = tp->max_##field;                                  \
 331         i->f->set_##field(starget, val);                                \
 332         return count;                                                   \
 333 }
 334
 335 #define spi_transport_rd_attr(field, format_string)                     \
 336         spi_transport_show_function(field, format_string)               \
 337         spi_transport_store_function(field, format_string)              \
 338 static DEVICE_ATTR(field, S_IRUGO,                              \
 339                    show_spi_transport_##field,                  \
 340                    store_spi_transport_##field);
 341
 342 #define spi_transport_simple_attr(field, format_string)                 \
 343         spi_transport_show_simple(field, format_string)                 \
 344         spi_transport_store_simple(field, format_string)                \
 345 static DEVICE_ATTR(field, S_IRUGO,                              \
 346                    show_spi_transport_##field,                  \
 347                    store_spi_transport_##field);
 348
 349 #define spi_transport_max_attr(field, format_string)                    \
 350         spi_transport_show_function(field, format_string)               \
 351         spi_transport_store_max(field, format_string)                   \
 352         spi_transport_simple_attr(max_##field, format_string)           \
 353 static DEVICE_ATTR(field, S_IRUGO,                              \
 354                    show_spi_transport_##field,                  \
 355                    store_spi_transport_##field);
 356
 357 /* The Parallel SCSI Tranport Attributes: */
 358 spi_transport_max_attr(offset, "%d\n");
 359 spi_transport_max_attr(width, "%d\n");
 360 spi_transport_rd_attr(iu, "%d\n");
 361 spi_transport_rd_attr(dt, "%d\n");
 362 spi_transport_rd_attr(qas, "%d\n");
 363 spi_transport_rd_attr(wr_flow, "%d\n");
 364 spi_transport_rd_attr(rd_strm, "%d\n");
 365 spi_transport_rd_attr(rti, "%d\n");
 366 spi_transport_rd_attr(pcomp_en, "%d\n");
 367 spi_transport_rd_attr(hold_mcs, "%d\n");
 368
 369 /* we only care about the first child device so we return 1 */
 370 static int child_iter(struct device *dev, void *data)
 371 {
 372         struct scsi_device *sdev = to_scsi_device(dev);
 373
 374         spi_dv_device(sdev);
 375         return 1;
 376 }
 377
 378 static ssize_t
 379 store_spi_revalidate(struct device *dev, struct device_attribute *attr,
 380                      const char *buf, size_t count)
 381 {
 382         struct scsi_target *starget = transport_class_to_starget(dev);
 383
 384         device_for_each_child(&starget->dev, NULL, child_iter);
 385         return count;
 386 }
 387 static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
 388
 389 /* Translate the period into ns according to the current spec
 390  * for SDTR/PPR messages */
 391 static int period_to_str(char *buf, int period)
 392 {
 393         int len, picosec;
 394
 395         if (period < 0 || period > 0xff) {
 396                 picosec = -1;
 397         } else if (period <= SPI_STATIC_PPR) {
 398                 picosec = ppr_to_ps[period];
 399         } else {
 400                 picosec = period * 4000;
 401         }
 402
 403         if (picosec == -1) {
 404                 len = sprintf(buf, "reserved");
 405         } else {
 406                 len = sprint_frac(buf, picosec, 1000);
 407         }
 408
 409         return len;
 410 }
 411
 412 static ssize_t
 413 show_spi_transport_period_helper(char *buf, int period)
 414 {
 415         int len = period_to_str(buf, period);
 416         buf[len++] = '\n';
 417         buf[len] = '\0';
 418         return len;
 419 }
 420
 421 static ssize_t
 422 store_spi_transport_period_helper(struct device *dev, const char *buf,
 423                                   size_t count, int *periodp)
 424 {
 425         int j, picosec, period = -1;
 426         char *endp;
 427
 428         picosec = simple_strtoul(buf, &endp, 10) * 1000;
 429         if (*endp == '.') {
 430                 int mult = 100;
 431                 do {
 432                         endp++;
 433                         if (!isdigit(*endp))
 434                                 break;
 435                         picosec += (*endp - '0') * mult;
 436                         mult /= 10;
 437                 } while (mult > 0);
 438         }
 439
 440         for (j = 0; j <= SPI_STATIC_PPR; j++) {
 441                 if (ppr_to_ps[j] < picosec)
 442                         continue;
 443                 period = j;
 444                 break;
 445         }
 446
 447         if (period == -1)
 448                 period = picosec / 4000;
 449
 450         if (period > 0xff)
 451                 period = 0xff;
 452
 453         *periodp = period;
 454
 455         return count;
 456 }
 457
 458 static ssize_t
 459 show_spi_transport_period(struct device *dev,
 460                           struct device_attribute *attr, char *buf)
 461 {
 462         struct scsi_target *starget = transport_class_to_starget(dev);
 463         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 464         struct spi_internal *i = to_spi_internal(shost->transportt);
 465         struct spi_transport_attrs *tp =
 466                 (struct spi_transport_attrs *)&starget->starget_data;
 467
 468         if (i->f->get_period)
 469                 i->f->get_period(starget);
 470
 471         return show_spi_transport_period_helper(buf, tp->period);
 472 }
 473
 474 static ssize_t
 475 store_spi_transport_period(struct device *cdev, struct device_attribute *attr,
 476                            const char *buf, size_t count)
 477 {
 478         struct scsi_target *starget = transport_class_to_starget(cdev);
 479         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 480         struct spi_internal *i = to_spi_internal(shost->transportt);
 481         struct spi_transport_attrs *tp =
 482                 (struct spi_transport_attrs *)&starget->starget_data;
 483         int period, retval;
 484
 485         if (!i->f->set_period)
 486                 return -EINVAL;
 487
 488         retval = store_spi_transport_period_helper(cdev, buf, count, &period);
 489
 490         if (period < tp->min_period)
 491                 period = tp->min_period;
 492
 493         i->f->set_period(starget, period);
 494
 495         return retval;
 496 }
 497
 498 static DEVICE_ATTR(period, S_IRUGO,
 499                    show_spi_transport_period,
 500                    store_spi_transport_period);
 501
 502 static ssize_t
 503 show_spi_transport_min_period(struct device *cdev,
 504                               struct device_attribute *attr, char *buf)
 505 {
 506         struct scsi_target *starget = transport_class_to_starget(cdev);
 507         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 508         struct spi_internal *i = to_spi_internal(shost->transportt);
 509         struct spi_transport_attrs *tp =
 510                 (struct spi_transport_attrs *)&starget->starget_data;
 511
 512         if (!i->f->set_period)
 513                 return -EINVAL;
 514
 515         return show_spi_transport_period_helper(buf, tp->min_period);
 516 }
 517
 518 static ssize_t
 519 store_spi_transport_min_period(struct device *cdev,
 520                                struct device_attribute *attr,
 521                                const char *buf, size_t count)
 522 {
 523         struct scsi_target *starget = transport_class_to_starget(cdev);
 524         struct spi_transport_attrs *tp =
 525                 (struct spi_transport_attrs *)&starget->starget_data;
 526
 527         return store_spi_transport_period_helper(cdev, buf, count,
 528                                                  &tp->min_period);
 529 }
 530
 531
 532 static DEVICE_ATTR(min_period, S_IRUGO,
 533                    show_spi_transport_min_period,
 534                    store_spi_transport_min_period);
 535
 536
 537 static ssize_t show_spi_host_signalling(struct device *cdev,
 538                                         struct device_attribute *attr,
 539                                         char *buf)
 540 {
 541         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 542         struct spi_internal *i = to_spi_internal(shost->transportt);
 543
 544         if (i->f->get_signalling)
 545                 i->f->get_signalling(shost);
 546
 547         return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
 548 }
 549 static ssize_t store_spi_host_signalling(struct device *dev,
 550                                          struct device_attribute *attr,
 551                                          const char *buf, size_t count)
 552 {
 553         struct Scsi_Host *shost = transport_class_to_shost(dev);
 554         struct spi_internal *i = to_spi_internal(shost->transportt);
 555         enum spi_signal_type type = spi_signal_to_value(buf);
 556
 557         if (!i->f->set_signalling)
 558                 return -EINVAL;
 559
 560         if (type != SPI_SIGNAL_UNKNOWN)
 561                 i->f->set_signalling(shost, type);
 562
 563         return count;
 564 }
 565 static DEVICE_ATTR(signalling, S_IRUGO,
 566                    show_spi_host_signalling,
 567                    store_spi_host_signalling);
 568
 569 #define DV_SET(x, y)                    \
 570         if(i->f->set_##x)               \
 571                 i->f->set_##x(sdev->sdev_target, y)
 572
 573 enum spi_compare_returns {
 574         SPI_COMPARE_SUCCESS,
 575         SPI_COMPARE_FAILURE,
 576         SPI_COMPARE_SKIP_TEST,
 577 };
 578
 579
 580 /* This is for read/write Domain Validation:  If the device supports
 581  * an echo buffer, we do read/write tests to it */
 582 static enum spi_compare_returns
 583 spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,
 584                           u8 *ptr, const int retries)
 585 {
 586         int len = ptr - buffer;
 587         int j, k, r, result;
 588         unsigned int pattern = 0x0000ffff;
 589         struct scsi_sense_hdr sshdr;
 590
 591         const char spi_write_buffer[] = {
 592                 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 593         };
 594         const char spi_read_buffer[] = {
 595                 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 596         };
 597
 598         /* set up the pattern buffer.  Doesn't matter if we spill
 599          * slightly beyond since that's where the read buffer is */
 600         for (j = 0; j < len; ) {
 601
 602                 /* fill the buffer with counting (test a) */
 603                 for ( ; j < min(len, 32); j++)
 604                         buffer[j] = j;
 605                 k = j;
 606                 /* fill the buffer with alternating words of 0x0 and
 607                  * 0xffff (test b) */
 608                 for ( ; j < min(len, k + 32); j += 2) {
 609                         u16 *word = (u16 *)&buffer[j];
 610
 611                         *word = (j & 0x02) ? 0x0000 : 0xffff;
 612                 }
 613                 k = j;
 614                 /* fill with crosstalk (alternating 0x5555 0xaaa)
 615                  * (test c) */
 616                 for ( ; j < min(len, k + 32); j += 2) {
 617                         u16 *word = (u16 *)&buffer[j];
 618
 619                         *word = (j & 0x02) ? 0x5555 : 0xaaaa;
 620                 }
 621                 k = j;
 622                 /* fill with shifting bits (test d) */
 623                 for ( ; j < min(len, k + 32); j += 4) {
 624                         u32 *word = (unsigned int *)&buffer[j];
 625                         u32 roll = (pattern & 0x80000000) ? 1 : 0;
 626
 627                         *word = pattern;
 628                         pattern = (pattern << 1) | roll;
 629                 }
 630                 /* don't bother with random data (test e) */
 631         }
 632
 633         for (r = 0; r < retries; r++) {
 634                 result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE,
 635                                      buffer, len, &sshdr);
 636                 if(result || !scsi_device_online(sdev)) {
 637
 638                         scsi_device_set_state(sdev, SDEV_QUIESCE);
 639                         if (scsi_sense_valid(&sshdr)
 640                             && sshdr.sense_key == ILLEGAL_REQUEST
 641                             /* INVALID FIELD IN CDB */
 642                             && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
 643                                 /* This would mean that the drive lied
 644                                  * to us about supporting an echo
 645                                  * buffer (unfortunately some Western
 646                                  * Digital drives do precisely this)
 647                                  */
 648                                 return SPI_COMPARE_SKIP_TEST;
 649
 650
 651                         sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
 652                         return SPI_COMPARE_FAILURE;
 653                 }
 654
 655                 memset(ptr, 0, len);
 656                 spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE,
 657                             ptr, len, NULL);
 658                 scsi_device_set_state(sdev, SDEV_QUIESCE);
 659
 660                 if (memcmp(buffer, ptr, len) != 0)
 661                         return SPI_COMPARE_FAILURE;
 662         }
 663         return SPI_COMPARE_SUCCESS;
 664 }
 665
 666 /* This is for the simplest form of Domain Validation: a read test
 667  * on the inquiry data from the device */
 668 static enum spi_compare_returns
 669 spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,
 670                               u8 *ptr, const int retries)
 671 {
 672         int r, result;
 673         const int len = sdev->inquiry_len;
 674         const char spi_inquiry[] = {
 675                 INQUIRY, 0, 0, 0, len, 0
 676         };
 677
 678         for (r = 0; r < retries; r++) {
 679                 memset(ptr, 0, len);
 680
 681                 result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE,
 682                                      ptr, len, NULL);
 683
 684                 if(result || !scsi_device_online(sdev)) {
 685                         scsi_device_set_state(sdev, SDEV_QUIESCE);
 686                         return SPI_COMPARE_FAILURE;
 687                 }
 688
 689                 /* If we don't have the inquiry data already, the
 690                  * first read gets it */
 691                 if (ptr == buffer) {
 692                         ptr += len;
 693                         --r;
 694                         continue;
 695                 }
 696
 697                 if (memcmp(buffer, ptr, len) != 0)
 698                         /* failure */
 699                         return SPI_COMPARE_FAILURE;
 700         }
 701         return SPI_COMPARE_SUCCESS;
 702 }
 703
 704 static enum spi_compare_returns
 705 spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,
 706                enum spi_compare_returns
 707                (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
 708 {
 709         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 710         struct scsi_target *starget = sdev->sdev_target;
 711         int period = 0, prevperiod = 0;
 712         enum spi_compare_returns retval;
 713
 714
 715         for (;;) {
 716                 int newperiod;
 717                 retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
 718
 719                 if (retval == SPI_COMPARE_SUCCESS
 720                     || retval == SPI_COMPARE_SKIP_TEST)
 721                         break;
 722
 723                 /* OK, retrain, fallback */
 724                 if (i->f->get_iu)
 725                         i->f->get_iu(starget);
 726                 if (i->f->get_qas)
 727                         i->f->get_qas(starget);
 728                 if (i->f->get_period)
 729                         i->f->get_period(sdev->sdev_target);
 730
 731                 /* Here's the fallback sequence; first try turning off
 732                  * IU, then QAS (if we can control them), then finally
 733                  * fall down the periods */
 734                 if (i->f->set_iu && spi_iu(starget)) {
 735                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n");
 736                         DV_SET(iu, 0);
 737                 } else if (i->f->set_qas && spi_qas(starget)) {
 738                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n");
 739                         DV_SET(qas, 0);
 740                 } else {
 741                         newperiod = spi_period(starget);
 742                         period = newperiod > period ? newperiod : period;
 743                         if (period < 0x0d)
 744                                 period++;
 745                         else
 746                                 period += period >> 1;
 747
 748                         if (unlikely(period > 0xff || period == prevperiod)) {
 749                                 /* Total failure; set to async and return */
 750                                 starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
 751                                 DV_SET(offset, 0);
 752                                 return SPI_COMPARE_FAILURE;
 753                         }
 754                         starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");
 755                         DV_SET(period, period);
 756                         prevperiod = period;
 757                 }
 758         }
 759         return retval;
 760 }
 761
 762 static int
 763 spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)
 764 {
 765         int l, result;
 766
 767         /* first off do a test unit ready.  This can error out
 768          * because of reservations or some other reason.  If it
 769          * fails, the device won't let us write to the echo buffer
 770          * so just return failure */
 771
 772         const char spi_test_unit_ready[] = {
 773                 TEST_UNIT_READY, 0, 0, 0, 0, 0
 774         };
 775
 776         const char spi_read_buffer_descriptor[] = {
 777                 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
 778         };
 779
 780
 781         /* We send a set of three TURs to clear any outstanding
 782          * unit attention conditions if they exist (Otherwise the
 783          * buffer tests won't be happy).  If the TUR still fails
 784          * (reservation conflict, device not ready, etc) just
 785          * skip the write tests */
 786         for (l = 0; ; l++) {
 787                 result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE,
 788                                      NULL, 0, NULL);
 789
 790                 if(result) {
 791                         if(l >= 3)
 792                                 return 0;
 793                 } else {
 794                         /* TUR succeeded */
 795                         break;
 796                 }
 797         }
 798
 799         result = spi_execute(sdev, spi_read_buffer_descriptor,
 800                              DMA_FROM_DEVICE, buffer, 4, NULL);
 801
 802         if (result)
 803                 /* Device has no echo buffer */
 804                 return 0;
 805
 806         return buffer[3] + ((buffer[2] & 0x1f) << 8);
 807 }
 808
 809 static void
 810 spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
 811 {
 812         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 813         struct scsi_target *starget = sdev->sdev_target;
 814         struct Scsi_Host *shost = sdev->host;
 815         int len = sdev->inquiry_len;
 816         int min_period = spi_min_period(starget);
 817         int max_width = spi_max_width(starget);
 818         /* first set us up for narrow async */
 819         DV_SET(offset, 0);
 820         DV_SET(width, 0);
 821
 822         if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
 823             != SPI_COMPARE_SUCCESS) {
 824                 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
 825                 /* FIXME: should probably offline the device here? */
 826                 return;
 827         }
 828
 829         if (!scsi_device_wide(sdev)) {
 830                 spi_max_width(starget) = 0;
 831                 max_width = 0;
 832         }
 833
 834         /* test width */
 835         if (i->f->set_width && max_width) {
 836                 i->f->set_width(starget, 1);
 837
 838                 if (spi_dv_device_compare_inquiry(sdev, buffer,
 839                                                    buffer + len,
 840                                                    DV_LOOPS)
 841                     != SPI_COMPARE_SUCCESS) {
 842                         starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
 843                         i->f->set_width(starget, 0);
 844                         /* Make sure we don't force wide back on by asking
 845                          * for a transfer period that requires it */
 846                         max_width = 0;
 847                         if (min_period < 10)
 848                                 min_period = 10;
 849                 }
 850         }
 851
 852         if (!i->f->set_period)
 853                 return;
 854
 855         /* device can't handle synchronous */
 856         if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev))
 857                 return;
 858
 859         /* len == -1 is the signal that we need to ascertain the
 860          * presence of an echo buffer before trying to use it.  len ==
 861          * 0 means we don't have an echo buffer */
 862         len = -1;
 863
 864  retry:
 865
 866         /* now set up to the maximum */
 867         DV_SET(offset, spi_max_offset(starget));
 868         DV_SET(period, min_period);
 869
 870         /* try QAS requests; this should be harmless to set if the
 871          * target supports it */
 872         if (scsi_device_qas(sdev)) {
 873                 DV_SET(qas, 1);
 874         } else {
 875                 DV_SET(qas, 0);
 876         }
 877
 878         if (scsi_device_ius(sdev) && min_period < 9) {
 879                 /* This u320 (or u640). Set IU transfers */
 880                 DV_SET(iu, 1);
 881                 /* Then set the optional parameters */
 882                 DV_SET(rd_strm, 1);
 883                 DV_SET(wr_flow, 1);
 884                 DV_SET(rti, 1);
 885                 if (min_period == 8)
 886                         DV_SET(pcomp_en, 1);
 887         } else {
 888                 DV_SET(iu, 0);
 889         }
 890
 891         /* now that we've done all this, actually check the bus
 892          * signal type (if known).  Some devices are stupid on
 893          * a SE bus and still claim they can try LVD only settings */
 894         if (i->f->get_signalling)
 895                 i->f->get_signalling(shost);
 896         if (spi_signalling(shost) == SPI_SIGNAL_SE ||
 897             spi_signalling(shost) == SPI_SIGNAL_HVD ||
 898             !scsi_device_dt(sdev)) {
 899                 DV_SET(dt, 0);
 900         } else {
 901                 DV_SET(dt, 1);
 902         }
 903         /* set width last because it will pull all the other
 904          * parameters down to required values */
 905         DV_SET(width, max_width);
 906
 907         /* Do the read only INQUIRY tests */
 908         spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
 909                        spi_dv_device_compare_inquiry);
 910         /* See if we actually managed to negotiate and sustain DT */
 911         if (i->f->get_dt)
 912                 i->f->get_dt(starget);
 913
 914         /* see if the device has an echo buffer.  If it does we can do
 915          * the SPI pattern write tests.  Because of some broken
 916          * devices, we *only* try this on a device that has actually
 917          * negotiated DT */
 918
 919         if (len == -1 && spi_dt(starget))
 920                 len = spi_dv_device_get_echo_buffer(sdev, buffer);
 921
 922         if (len <= 0) {
 923                 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
 924                 return;
 925         }
 926
 927         if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
 928                 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
 929                 len = SPI_MAX_ECHO_BUFFER_SIZE;
 930         }
 931
 932         if (spi_dv_retrain(sdev, buffer, buffer + len,
 933                            spi_dv_device_echo_buffer)
 934             == SPI_COMPARE_SKIP_TEST) {
 935                 /* OK, the stupid drive can't do a write echo buffer
 936                  * test after all, fall back to the read tests */
 937                 len = 0;
 938                 goto retry;
 939         }
 940 }
 941
 942
 943 /**     spi_dv_device - Do Domain Validation on the device
 944  *      @sdev:          scsi device to validate
 945  *
 946  *      Performs the domain validation on the given device in the
 947  *      current execution thread.  Since DV operations may sleep,
 948  *      the current thread must have user context.  Also no SCSI
 949  *      related locks that would deadlock I/O issued by the DV may
 950  *      be held.
 951  */
 952 void
 953 spi_dv_device(struct scsi_device *sdev)
 954 {
 955         struct scsi_target *starget = sdev->sdev_target;
 956         u8 *buffer;
 957         const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
 958
 959         if (unlikely(scsi_device_get(sdev)))
 960                 return;
 961
 962         if (unlikely(spi_dv_in_progress(starget)))
 963                 return;
 964         spi_dv_in_progress(starget) = 1;
 965
 966         buffer = kzalloc(len, GFP_KERNEL);
 967
 968         if (unlikely(!buffer))
 969                 goto out_put;
 970
 971         /* We need to verify that the actual device will quiesce; the
 972          * later target quiesce is just a nice to have */
 973         if (unlikely(scsi_device_quiesce(sdev)))
 974                 goto out_free;
 975
 976         scsi_target_quiesce(starget);
 977
 978         spi_dv_pending(starget) = 1;
 979         mutex_lock(&spi_dv_mutex(starget));
 980
 981         starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
 982
 983         spi_dv_device_internal(sdev, buffer);
 984
 985         starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
 986
 987         mutex_unlock(&spi_dv_mutex(starget));
 988         spi_dv_pending(starget) = 0;
 989
 990         scsi_target_resume(starget);
 991
 992         spi_initial_dv(starget) = 1;
 993
 994  out_free:
 995         kfree(buffer);
 996  out_put:
 997         spi_dv_in_progress(starget) = 0;
 998         scsi_device_put(sdev);
 999 }
1000 EXPORT_SYMBOL(spi_dv_device);
1001
1002 struct work_queue_wrapper {
1003         struct work_struct      work;
1004         struct scsi_device      *sdev;
1005 };
1006
1007 static void
1008 spi_dv_device_work_wrapper(struct work_struct *work)
1009 {
1010         struct work_queue_wrapper *wqw =
1011                 container_of(work, struct work_queue_wrapper, work);
1012         struct scsi_device *sdev = wqw->sdev;
1013
1014         kfree(wqw);
1015         spi_dv_device(sdev);
1016         spi_dv_pending(sdev->sdev_target) = 0;
1017         scsi_device_put(sdev);
1018 }
1019
1020
1021 /**
1022  *      spi_schedule_dv_device - schedule domain validation to occur on the device
1023  *      @sdev:  The device to validate
1024  *
1025  *      Identical to spi_dv_device() above, except that the DV will be
1026  *      scheduled to occur in a workqueue later.  All memory allocations
1027  *      are atomic, so may be called from any context including those holding
1028  *      SCSI locks.
1029  */
1030 void
1031 spi_schedule_dv_device(struct scsi_device *sdev)
1032 {
1033         struct work_queue_wrapper *wqw =
1034                 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
1035
1036         if (unlikely(!wqw))
1037                 return;
1038
1039         if (unlikely(spi_dv_pending(sdev->sdev_target))) {
1040                 kfree(wqw);
1041                 return;
1042         }
1043         /* Set pending early (dv_device doesn't check it, only sets it) */
1044         spi_dv_pending(sdev->sdev_target) = 1;
1045         if (unlikely(scsi_device_get(sdev))) {
1046                 kfree(wqw);
1047                 spi_dv_pending(sdev->sdev_target) = 0;
1048                 return;
1049         }
1050
1051         INIT_WORK(&wqw->work, spi_dv_device_work_wrapper);
1052         wqw->sdev = sdev;
1053
1054         schedule_work(&wqw->work);
1055 }
1056 EXPORT_SYMBOL(spi_schedule_dv_device);
1057
1058 /**
1059  * spi_display_xfer_agreement - Print the current target transfer agreement
1060  * @starget: The target for which to display the agreement
1061  *
1062  * Each SPI port is required to maintain a transfer agreement for each
1063  * other port on the bus.  This function prints a one-line summary of
1064  * the current agreement; more detailed information is available in sysfs.
1065  */
1066 void spi_display_xfer_agreement(struct scsi_target *starget)
1067 {
1068         struct spi_transport_attrs *tp;
1069         tp = (struct spi_transport_attrs *)&starget->starget_data;
1070
1071         if (tp->offset > 0 && tp->period > 0) {
1072                 unsigned int picosec, kb100;
1073                 char *scsi = "FAST-?";
1074                 char tmp[8];
1075
1076                 if (tp->period <= SPI_STATIC_PPR) {
1077                         picosec = ppr_to_ps[tp->period];
1078                         switch (tp->period) {
1079                                 case  7: scsi = "FAST-320"; break;
1080                                 case  8: scsi = "FAST-160"; break;
1081                                 case  9: scsi = "FAST-80"; break;
1082                                 case 10:
1083                                 case 11: scsi = "FAST-40"; break;
1084                                 case 12: scsi = "FAST-20"; break;
1085                         }
1086                 } else {
1087                         picosec = tp->period * 4000;
1088                         if (tp->period < 25)
1089                                 scsi = "FAST-20";
1090                         else if (tp->period < 50)
1091                                 scsi = "FAST-10";
1092                         else
1093                                 scsi = "FAST-5";
1094                 }
1095
1096                 kb100 = (10000000 + picosec / 2) / picosec;
1097                 if (tp->width)
1098                         kb100 *= 2;
1099                 sprint_frac(tmp, picosec, 1000);
1100
1101                 dev_info(&starget->dev,
1102                          "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1103                          scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1104                          tp->dt ? "DT" : "ST",
1105                          tp->iu ? " IU" : "",
1106                          tp->qas  ? " QAS" : "",
1107                          tp->rd_strm ? " RDSTRM" : "",
1108                          tp->rti ? " RTI" : "",
1109                          tp->wr_flow ? " WRFLOW" : "",
1110                          tp->pcomp_en ? " PCOMP" : "",
1111                          tp->hold_mcs ? " HMCS" : "",
1112                          tmp, tp->offset);
1113         } else {
1114                 dev_info(&starget->dev, "%sasynchronous\n",
1115                                 tp->width ? "wide " : "");
1116         }
1117 }
1118 EXPORT_SYMBOL(spi_display_xfer_agreement);
1119
1120 int spi_populate_width_msg(unsigned char *msg, int width)
1121 {
1122         msg[0] = EXTENDED_MESSAGE;
1123         msg[1] = 2;
1124         msg[2] = EXTENDED_WDTR;
1125         msg[3] = width;
1126         return 4;
1127 }
1128 EXPORT_SYMBOL_GPL(spi_populate_width_msg);
1129
1130 int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
1131 {
1132         msg[0] = EXTENDED_MESSAGE;
1133         msg[1] = 3;
1134         msg[2] = EXTENDED_SDTR;
1135         msg[3] = period;
1136         msg[4] = offset;
1137         return 5;
1138 }
1139 EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
1140
1141 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
1142                 int width, int options)
1143 {
1144         msg[0] = EXTENDED_MESSAGE;
1145         msg[1] = 6;
1146         msg[2] = EXTENDED_PPR;
1147         msg[3] = period;
1148         msg[4] = 0;
1149         msg[5] = offset;
1150         msg[6] = width;
1151         msg[7] = options;
1152         return 8;
1153 }
1154 EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
1155
1156 #ifdef CONFIG_SCSI_CONSTANTS
1157 static const char * const one_byte_msgs[] = {
1158 /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",
1159 /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error",
1160 /* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",
1161 /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1162 /* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set",
1163 /* 0x0f */ "Initiate Recovery", "Release Recovery",
1164 /* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",
1165 /* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"
1166 };
1167
1168 static const char * const two_byte_msgs[] = {
1169 /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
1170 /* 0x23 */ "Ignore Wide Residue", "ACA"
1171 };
1172
1173 static const char * const extended_msgs[] = {
1174 /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1175 /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",
1176 /* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"
1177 };
1178
1179 static void print_nego(const unsigned char *msg, int per, int off, int width)
1180 {
1181         if (per) {
1182                 char buf[20];
1183                 period_to_str(buf, msg[per]);
1184                 printk("period = %s ns ", buf);
1185         }
1186
1187         if (off)
1188                 printk("offset = %d ", msg[off]);
1189         if (width)
1190                 printk("width = %d ", 8 << msg[width]);
1191 }
1192
1193 static void print_ptr(const unsigned char *msg, int msb, const char *desc)
1194 {
1195         int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |
1196                         msg[msb+3];
1197         printk("%s = %d ", desc, ptr);
1198 }
1199
1200 int spi_print_msg(const unsigned char *msg)
1201 {
1202         int len = 1, i;
1203         if (msg[0] == EXTENDED_MESSAGE) {
1204                 len = 2 + msg[1];
1205                 if (len == 2)
1206                         len += 256;
1207                 if (msg[2] < ARRAY_SIZE(extended_msgs))
1208                         printk ("%s ", extended_msgs[msg[2]]);
1209                 else
1210                         printk ("Extended Message, reserved code (0x%02x) ",
1211                                 (int) msg[2]);
1212                 switch (msg[2]) {
1213                 case EXTENDED_MODIFY_DATA_POINTER:
1214                         print_ptr(msg, 3, "pointer");
1215                         break;
1216                 case EXTENDED_SDTR:
1217                         print_nego(msg, 3, 4, 0);
1218                         break;
1219                 case EXTENDED_WDTR:
1220                         print_nego(msg, 0, 0, 3);
1221                         break;
1222                 case EXTENDED_PPR:
1223                         print_nego(msg, 3, 5, 6);
1224                         break;
1225                 case EXTENDED_MODIFY_BIDI_DATA_PTR:
1226                         print_ptr(msg, 3, "out");
1227                         print_ptr(msg, 7, "in");
1228                         break;
1229                 default:
1230                 for (i = 2; i < len; ++i)
1231                         printk("%02x ", msg[i]);
1232                 }
1233         /* Identify */
1234         } else if (msg[0] & 0x80) {
1235                 printk("Identify disconnect %sallowed %s %d ",
1236                         (msg[0] & 0x40) ? "" : "not ",
1237                         (msg[0] & 0x20) ? "target routine" : "lun",
1238                         msg[0] & 0x7);
1239         /* Normal One byte */
1240         } else if (msg[0] < 0x1f) {
1241                 if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])
1242                         printk("%s ", one_byte_msgs[msg[0]]);
1243                 else
1244                         printk("reserved (%02x) ", msg[0]);
1245         } else if (msg[0] == 0x55) {
1246                 printk("QAS Request ");
1247         /* Two byte */
1248         } else if (msg[0] <= 0x2f) {
1249                 if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))
1250                         printk("%s %02x ", two_byte_msgs[msg[0] - 0x20],
1251                                 msg[1]);
1252                 else
1253                         printk("reserved two byte (%02x %02x) ",
1254                                 msg[0], msg[1]);
1255                 len = 2;
1256         } else
1257                 printk("reserved ");
1258         return len;
1259 }
1260 EXPORT_SYMBOL(spi_print_msg);
1261
1262 #else  /* ifndef CONFIG_SCSI_CONSTANTS */
1263
1264 int spi_print_msg(const unsigned char *msg)
1265 {
1266         int len = 1, i;
1267
1268         if (msg[0] == EXTENDED_MESSAGE) {
1269                 len = 2 + msg[1];
1270                 if (len == 2)
1271                         len += 256;
1272                 for (i = 0; i < len; ++i)
1273                         printk("%02x ", msg[i]);
1274         /* Identify */
1275         } else if (msg[0] & 0x80) {
1276                 printk("%02x ", msg[0]);
1277         /* Normal One byte */
1278         } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {
1279                 printk("%02x ", msg[0]);
1280         /* Two byte */
1281         } else if (msg[0] <= 0x2f) {
1282                 printk("%02x %02x", msg[0], msg[1]);
1283                 len = 2;
1284         } else
1285                 printk("%02x ", msg[0]);
1286         return len;
1287 }
1288 EXPORT_SYMBOL(spi_print_msg);
1289 #endif /* ! CONFIG_SCSI_CONSTANTS */
1290
1291 static int spi_device_match(struct attribute_container *cont,
1292                             struct device *dev)
1293 {
1294         struct scsi_device *sdev;
1295         struct Scsi_Host *shost;
1296         struct spi_internal *i;
1297
1298         if (!scsi_is_sdev_device(dev))
1299                 return 0;
1300
1301         sdev = to_scsi_device(dev);
1302         shost = sdev->host;
1303         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1304             != &spi_host_class.class)
1305                 return 0;
1306         /* Note: this class has no device attributes, so it has
1307          * no per-HBA allocation and thus we don't need to distinguish
1308          * the attribute containers for the device */
1309         i = to_spi_internal(shost->transportt);
1310         if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1311                 return 0;
1312         return 1;
1313 }
1314
1315 static int spi_target_match(struct attribute_container *cont,
1316                             struct device *dev)
1317 {
1318         struct Scsi_Host *shost;
1319         struct scsi_target *starget;
1320         struct spi_internal *i;
1321
1322         if (!scsi_is_target_device(dev))
1323                 return 0;
1324
1325         shost = dev_to_shost(dev->parent);
1326         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1327             != &spi_host_class.class)
1328                 return 0;
1329
1330         i = to_spi_internal(shost->transportt);
1331         starget = to_scsi_target(dev);
1332
1333         if (i->f->deny_binding && i->f->deny_binding(starget))
1334                 return 0;
1335
1336         return &i->t.target_attrs.ac == cont;
1337 }
1338
1339 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1340                                "spi_transport",
1341                                spi_setup_transport_attrs,
1342                                NULL,
1343                                spi_target_configure);
1344
1345 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1346                                     spi_device_match,
1347                                     spi_device_configure);
1348
1349 static struct attribute *host_attributes[] = {
1350         &dev_attr_signalling.attr,
1351         NULL
1352 };
1353
1354 static struct attribute_group host_attribute_group = {
1355         .attrs = host_attributes,
1356 };
1357
1358 static int spi_host_configure(struct transport_container *tc,
1359                               struct device *dev,
1360                               struct device *cdev)
1361 {
1362         struct kobject *kobj = &cdev->kobj;
1363         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1364         struct spi_internal *si = to_spi_internal(shost->transportt);
1365         struct attribute *attr = &dev_attr_signalling.attr;
1366         int rc = 0;
1367
1368         if (si->f->set_signalling)
1369                 rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR);
1370
1371         return rc;
1372 }
1373
1374 /* returns true if we should be showing the variable.  Also
1375  * overloads the return by setting 1<<1 if the attribute should
1376  * be writeable */
1377 #define TARGET_ATTRIBUTE_HELPER(name) \
1378         (si->f->show_##name ? S_IRUGO : 0) | \
1379         (si->f->set_##name ? S_IWUSR : 0)
1380
1381 static mode_t target_attribute_is_visible(struct kobject *kobj,
1382                                           struct attribute *attr, int i)
1383 {
1384         struct device *cdev = container_of(kobj, struct device, kobj);
1385         struct scsi_target *starget = transport_class_to_starget(cdev);
1386         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1387         struct spi_internal *si = to_spi_internal(shost->transportt);
1388
1389         if (attr == &dev_attr_period.attr &&
1390             spi_support_sync(starget))
1391                 return TARGET_ATTRIBUTE_HELPER(period);
1392         else if (attr == &dev_attr_min_period.attr &&
1393                  spi_support_sync(starget))
1394                 return TARGET_ATTRIBUTE_HELPER(period);
1395         else if (attr == &dev_attr_offset.attr &&
1396                  spi_support_sync(starget))
1397                 return TARGET_ATTRIBUTE_HELPER(offset);
1398         else if (attr == &dev_attr_max_offset.attr &&
1399                  spi_support_sync(starget))
1400                 return TARGET_ATTRIBUTE_HELPER(offset);
1401         else if (attr == &dev_attr_width.attr &&
1402                  spi_support_wide(starget))
1403                 return TARGET_ATTRIBUTE_HELPER(width);
1404         else if (attr == &dev_attr_max_width.attr &&
1405                  spi_support_wide(starget))
1406                 return TARGET_ATTRIBUTE_HELPER(width);
1407         else if (attr == &dev_attr_iu.attr &&
1408                  spi_support_ius(starget))
1409                 return TARGET_ATTRIBUTE_HELPER(iu);
1410         else if (attr == &dev_attr_dt.attr &&
1411                  spi_support_dt(starget))
1412                 return TARGET_ATTRIBUTE_HELPER(dt);
1413         else if (attr == &dev_attr_qas.attr &&
1414                  spi_support_qas(starget))
1415                 return TARGET_ATTRIBUTE_HELPER(qas);
1416         else if (attr == &dev_attr_wr_flow.attr &&
1417                  spi_support_ius(starget))
1418                 return TARGET_ATTRIBUTE_HELPER(wr_flow);
1419         else if (attr == &dev_attr_rd_strm.attr &&
1420                  spi_support_ius(starget))
1421                 return TARGET_ATTRIBUTE_HELPER(rd_strm);
1422         else if (attr == &dev_attr_rti.attr &&
1423                  spi_support_ius(starget))
1424                 return TARGET_ATTRIBUTE_HELPER(rti);
1425         else if (attr == &dev_attr_pcomp_en.attr &&
1426                  spi_support_ius(starget))
1427                 return TARGET_ATTRIBUTE_HELPER(pcomp_en);
1428         else if (attr == &dev_attr_hold_mcs.attr &&
1429                  spi_support_ius(starget))
1430                 return TARGET_ATTRIBUTE_HELPER(hold_mcs);
1431         else if (attr == &dev_attr_revalidate.attr)
1432                 return S_IWUSR;
1433
1434         return 0;
1435 }
1436
1437 static struct attribute *target_attributes[] = {
1438         &dev_attr_period.attr,
1439         &dev_attr_min_period.attr,
1440         &dev_attr_offset.attr,
1441         &dev_attr_max_offset.attr,
1442         &dev_attr_width.attr,
1443         &dev_attr_max_width.attr,
1444         &dev_attr_iu.attr,
1445         &dev_attr_dt.attr,
1446         &dev_attr_qas.attr,
1447         &dev_attr_wr_flow.attr,
1448         &dev_attr_rd_strm.attr,
1449         &dev_attr_rti.attr,
1450         &dev_attr_pcomp_en.attr,
1451         &dev_attr_hold_mcs.attr,
1452         &dev_attr_revalidate.attr,
1453         NULL
1454 };
1455
1456 static struct attribute_group target_attribute_group = {
1457         .attrs = target_attributes,
1458         .is_visible = target_attribute_is_visible,
1459 };
1460
1461 static int spi_target_configure(struct transport_container *tc,
1462                                 struct device *dev,
1463                                 struct device *cdev)
1464 {
1465         struct kobject *kobj = &cdev->kobj;
1466
1467         /* force an update based on parameters read from the device */
1468         sysfs_update_group(kobj, &target_attribute_group);
1469
1470         return 0;
1471 }
1472
1473 struct scsi_transport_template *
1474 spi_attach_transport(struct spi_function_template *ft)
1475 {
1476         struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
1477                                          GFP_KERNEL);
1478
1479         if (unlikely(!i))
1480                 return NULL;
1481
1482         i->t.target_attrs.ac.class = &spi_transport_class.class;
1483         i->t.target_attrs.ac.grp = &target_attribute_group;
1484         i->t.target_attrs.ac.match = spi_target_match;
1485         transport_container_register(&i->t.target_attrs);
1486         i->t.target_size = sizeof(struct spi_transport_attrs);
1487         i->t.host_attrs.ac.class = &spi_host_class.class;
1488         i->t.host_attrs.ac.grp = &host_attribute_group;
1489         i->t.host_attrs.ac.match = spi_host_match;
1490         transport_container_register(&i->t.host_attrs);
1491         i->t.host_size = sizeof(struct spi_host_attrs);
1492         i->f = ft;
1493
1494         return &i->t;
1495 }
1496 EXPORT_SYMBOL(spi_attach_transport);
1497
1498 void spi_release_transport(struct scsi_transport_template *t)
1499 {
1500         struct spi_internal *i = to_spi_internal(t);
1501
1502         transport_container_unregister(&i->t.target_attrs);
1503         transport_container_unregister(&i->t.host_attrs);
1504
1505         kfree(i);
1506 }
1507 EXPORT_SYMBOL(spi_release_transport);
1508
1509 static __init int spi_transport_init(void)
1510 {
1511         int error = transport_class_register(&spi_transport_class);
1512         if (error)
1513                 return error;
1514         error = anon_transport_class_register(&spi_device_class);
1515         return transport_class_register(&spi_host_class);
1516 }
1517
1518 static void __exit spi_transport_exit(void)
1519 {
1520         transport_class_unregister(&spi_transport_class);
1521         anon_transport_class_unregister(&spi_device_class);
1522         transport_class_unregister(&spi_host_class);
1523 }
1524
1525 MODULE_AUTHOR("Martin Hicks");
1526 MODULE_DESCRIPTION("SPI Transport Attributes");
1527 MODULE_LICENSE("GPL");
1528
1529 module_init(spi_transport_init);
1530 module_exit(spi_transport_exit);