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_DEV |
 113                                       REQ_FAILFAST_TRANSPORT |
 114                                       REQ_FAILFAST_DRIVER);
 115                 if (result & DRIVER_SENSE) {
 116                         struct scsi_sense_hdr sshdr_tmp;
 117                         if (!sshdr)
 118                                 sshdr = &sshdr_tmp;
 119
 120                         if (scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE,
 121                                                  sshdr)
 122                             && sshdr->sense_key == UNIT_ATTENTION)
 123                                 continue;
 124                 }
 125                 break;
 126         }
 127         return result;
 128 }
 129
 130 static struct {
 131         enum spi_signal_type    value;
 132         char                    *name;
 133 } signal_types[] = {
 134         { SPI_SIGNAL_UNKNOWN, "unknown" },
 135         { SPI_SIGNAL_SE, "SE" },
 136         { SPI_SIGNAL_LVD, "LVD" },
 137         { SPI_SIGNAL_HVD, "HVD" },
 138 };
 139
 140 static inline const char *spi_signal_to_string(enum spi_signal_type type)
 141 {
 142         int i;
 143
 144         for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 145                 if (type == signal_types[i].value)
 146                         return signal_types[i].name;
 147         }
 148         return NULL;
 149 }
 150 static inline enum spi_signal_type spi_signal_to_value(const char *name)
 151 {
 152         int i, len;
 153
 154         for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 155                 len =  strlen(signal_types[i].name);
 156                 if (strncmp(name, signal_types[i].name, len) == 0 &&
 157                     (name[len] == '\n' || name[len] == '\0'))
 158                         return signal_types[i].value;
 159         }
 160         return SPI_SIGNAL_UNKNOWN;
 161 }
 162
 163 static int spi_host_setup(struct transport_container *tc, struct device *dev,
 164                           struct device *cdev)
 165 {
 166         struct Scsi_Host *shost = dev_to_shost(dev);
 167
 168         spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
 169
 170         return 0;
 171 }
 172
 173 static int spi_host_configure(struct transport_container *tc,
 174                               struct device *dev,
 175                               struct device *cdev);
 176
 177 static DECLARE_TRANSPORT_CLASS(spi_host_class,
 178                                "spi_host",
 179                                spi_host_setup,
 180                                NULL,
 181                                spi_host_configure);
 182
 183 static int spi_host_match(struct attribute_container *cont,
 184                           struct device *dev)
 185 {
 186         struct Scsi_Host *shost;
 187
 188         if (!scsi_is_host_device(dev))
 189                 return 0;
 190
 191         shost = dev_to_shost(dev);
 192         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 193             != &spi_host_class.class)
 194                 return 0;
 195
 196         return &shost->transportt->host_attrs.ac == cont;
 197 }
 198
 199 static int spi_target_configure(struct transport_container *tc,
 200                                 struct device *dev,
 201                                 struct device *cdev);
 202
 203 static int spi_device_configure(struct transport_container *tc,
 204                                 struct device *dev,
 205                                 struct 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 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_dv_in_progress(starget) = 0;
 245         spi_initial_dv(starget) = 0;
 246         mutex_init(&spi_dv_mutex(starget));
 247
 248         return 0;
 249 }
 250
 251 #define spi_transport_show_simple(field, format_string)                 \
 252                                                                         \
 253 static ssize_t                                                          \
 254 show_spi_transport_##field(struct device *dev,                  \
 255                            struct device_attribute *attr, char *buf)    \
 256 {                                                                       \
 257         struct scsi_target *starget = transport_class_to_starget(dev);  \
 258         struct spi_transport_attrs *tp;                                 \
 259                                                                         \
 260         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 261         return snprintf(buf, 20, format_string, tp->field);             \
 262 }
 263
 264 #define spi_transport_store_simple(field, format_string)                \
 265                                                                         \
 266 static ssize_t                                                          \
 267 store_spi_transport_##field(struct device *dev,                         \
 268                             struct device_attribute *attr,              \
 269                             const char *buf, size_t count)              \
 270 {                                                                       \
 271         int val;                                                        \
 272         struct scsi_target *starget = transport_class_to_starget(dev);  \
 273         struct spi_transport_attrs *tp;                                 \
 274                                                                         \
 275         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 276         val = simple_strtoul(buf, NULL, 0);                             \
 277         tp->field = val;                                                \
 278         return count;                                                   \
 279 }
 280
 281 #define spi_transport_show_function(field, format_string)               \
 282                                                                         \
 283 static ssize_t                                                          \
 284 show_spi_transport_##field(struct device *dev,                  \
 285                            struct device_attribute *attr, char *buf)    \
 286 {                                                                       \
 287         struct scsi_target *starget = transport_class_to_starget(dev);  \
 288         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 289         struct spi_transport_attrs *tp;                                 \
 290         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 291         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 292         if (i->f->get_##field)                                          \
 293                 i->f->get_##field(starget);                             \
 294         return snprintf(buf, 20, format_string, tp->field);             \
 295 }
 296
 297 #define spi_transport_store_function(field, format_string)              \
 298 static ssize_t                                                          \
 299 store_spi_transport_##field(struct device *dev,                         \
 300                             struct device_attribute *attr,              \
 301                             const char *buf, size_t count)              \
 302 {                                                                       \
 303         int val;                                                        \
 304         struct scsi_target *starget = transport_class_to_starget(dev);  \
 305         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 306         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 307                                                                         \
 308         if (!i->f->set_##field)                                         \
 309                 return -EINVAL;                                         \
 310         val = simple_strtoul(buf, NULL, 0);                             \
 311         i->f->set_##field(starget, val);                                \
 312         return count;                                                   \
 313 }
 314
 315 #define spi_transport_store_max(field, format_string)                   \
 316 static ssize_t                                                          \
 317 store_spi_transport_##field(struct device *dev,                         \
 318                             struct device_attribute *attr,              \
 319                             const char *buf, size_t count)              \
 320 {                                                                       \
 321         int val;                                                        \
 322         struct scsi_target *starget = transport_class_to_starget(dev);  \
 323         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 324         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 325         struct spi_transport_attrs *tp                                  \
 326                 = (struct spi_transport_attrs *)&starget->starget_data; \
 327                                                                         \
 328         if (i->f->set_##field)                                          \
 329                 return -EINVAL;                                         \
 330         val = simple_strtoul(buf, NULL, 0);                             \
 331         if (val > tp->max_##field)                                      \
 332                 val = tp->max_##field;                                  \
 333         i->f->set_##field(starget, val);                                \
 334         return count;                                                   \
 335 }
 336
 337 #define spi_transport_rd_attr(field, format_string)                     \
 338         spi_transport_show_function(field, format_string)               \
 339         spi_transport_store_function(field, format_string)              \
 340 static DEVICE_ATTR(field, S_IRUGO,                              \
 341                    show_spi_transport_##field,                  \
 342                    store_spi_transport_##field);
 343
 344 #define spi_transport_simple_attr(field, format_string)                 \
 345         spi_transport_show_simple(field, format_string)                 \
 346         spi_transport_store_simple(field, format_string)                \
 347 static DEVICE_ATTR(field, S_IRUGO,                              \
 348                    show_spi_transport_##field,                  \
 349                    store_spi_transport_##field);
 350
 351 #define spi_transport_max_attr(field, format_string)                    \
 352         spi_transport_show_function(field, format_string)               \
 353         spi_transport_store_max(field, format_string)                   \
 354         spi_transport_simple_attr(max_##field, format_string)           \
 355 static DEVICE_ATTR(field, S_IRUGO,                              \
 356                    show_spi_transport_##field,                  \
 357                    store_spi_transport_##field);
 358
 359 /* The Parallel SCSI Tranport Attributes: */
 360 spi_transport_max_attr(offset, "%d\n");
 361 spi_transport_max_attr(width, "%d\n");
 362 spi_transport_rd_attr(iu, "%d\n");
 363 spi_transport_rd_attr(dt, "%d\n");
 364 spi_transport_rd_attr(qas, "%d\n");
 365 spi_transport_rd_attr(wr_flow, "%d\n");
 366 spi_transport_rd_attr(rd_strm, "%d\n");
 367 spi_transport_rd_attr(rti, "%d\n");
 368 spi_transport_rd_attr(pcomp_en, "%d\n");
 369 spi_transport_rd_attr(hold_mcs, "%d\n");
 370
 371 /* we only care about the first child device that's a real SCSI device
 372  * so we return 1 to terminate the iteration when we find it */
 373 static int child_iter(struct device *dev, void *data)
 374 {
 375         if (!scsi_is_sdev_device(dev))
 376                 return 0;
 377
 378         spi_dv_device(to_scsi_device(dev));
 379         return 1;
 380 }
 381
 382 static ssize_t
 383 store_spi_revalidate(struct device *dev, struct device_attribute *attr,
 384                      const char *buf, size_t count)
 385 {
 386         struct scsi_target *starget = transport_class_to_starget(dev);
 387
 388         device_for_each_child(&starget->dev, NULL, child_iter);
 389         return count;
 390 }
 391 static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
 392
 393 /* Translate the period into ns according to the current spec
 394  * for SDTR/PPR messages */
 395 static int period_to_str(char *buf, int period)
 396 {
 397         int len, picosec;
 398
 399         if (period < 0 || period > 0xff) {
 400                 picosec = -1;
 401         } else if (period <= SPI_STATIC_PPR) {
 402                 picosec = ppr_to_ps[period];
 403         } else {
 404                 picosec = period * 4000;
 405         }
 406
 407         if (picosec == -1) {
 408                 len = sprintf(buf, "reserved");
 409         } else {
 410                 len = sprint_frac(buf, picosec, 1000);
 411         }
 412
 413         return len;
 414 }
 415
 416 static ssize_t
 417 show_spi_transport_period_helper(char *buf, int period)
 418 {
 419         int len = period_to_str(buf, period);
 420         buf[len++] = '\n';
 421         buf[len] = '\0';
 422         return len;
 423 }
 424
 425 static ssize_t
 426 store_spi_transport_period_helper(struct device *dev, const char *buf,
 427                                   size_t count, int *periodp)
 428 {
 429         int j, picosec, period = -1;
 430         char *endp;
 431
 432         picosec = simple_strtoul(buf, &endp, 10) * 1000;
 433         if (*endp == '.') {
 434                 int mult = 100;
 435                 do {
 436                         endp++;
 437                         if (!isdigit(*endp))
 438                                 break;
 439                         picosec += (*endp - '0') * mult;
 440                         mult /= 10;
 441                 } while (mult > 0);
 442         }
 443
 444         for (j = 0; j <= SPI_STATIC_PPR; j++) {
 445                 if (ppr_to_ps[j] < picosec)
 446                         continue;
 447                 period = j;
 448                 break;
 449         }
 450
 451         if (period == -1)
 452                 period = picosec / 4000;
 453
 454         if (period > 0xff)
 455                 period = 0xff;
 456
 457         *periodp = period;
 458
 459         return count;
 460 }
 461
 462 static ssize_t
 463 show_spi_transport_period(struct device *dev,
 464                           struct device_attribute *attr, char *buf)
 465 {
 466         struct scsi_target *starget = transport_class_to_starget(dev);
 467         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 468         struct spi_internal *i = to_spi_internal(shost->transportt);
 469         struct spi_transport_attrs *tp =
 470                 (struct spi_transport_attrs *)&starget->starget_data;
 471
 472         if (i->f->get_period)
 473                 i->f->get_period(starget);
 474
 475         return show_spi_transport_period_helper(buf, tp->period);
 476 }
 477
 478 static ssize_t
 479 store_spi_transport_period(struct device *cdev, struct device_attribute *attr,
 480                            const char *buf, size_t count)
 481 {
 482         struct scsi_target *starget = transport_class_to_starget(cdev);
 483         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 484         struct spi_internal *i = to_spi_internal(shost->transportt);
 485         struct spi_transport_attrs *tp =
 486                 (struct spi_transport_attrs *)&starget->starget_data;
 487         int period, retval;
 488
 489         if (!i->f->set_period)
 490                 return -EINVAL;
 491
 492         retval = store_spi_transport_period_helper(cdev, buf, count, &period);
 493
 494         if (period < tp->min_period)
 495                 period = tp->min_period;
 496
 497         i->f->set_period(starget, period);
 498
 499         return retval;
 500 }
 501
 502 static DEVICE_ATTR(period, S_IRUGO,
 503                    show_spi_transport_period,
 504                    store_spi_transport_period);
 505
 506 static ssize_t
 507 show_spi_transport_min_period(struct device *cdev,
 508                               struct device_attribute *attr, char *buf)
 509 {
 510         struct scsi_target *starget = transport_class_to_starget(cdev);
 511         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 512         struct spi_internal *i = to_spi_internal(shost->transportt);
 513         struct spi_transport_attrs *tp =
 514                 (struct spi_transport_attrs *)&starget->starget_data;
 515
 516         if (!i->f->set_period)
 517                 return -EINVAL;
 518
 519         return show_spi_transport_period_helper(buf, tp->min_period);
 520 }
 521
 522 static ssize_t
 523 store_spi_transport_min_period(struct device *cdev,
 524                                struct device_attribute *attr,
 525                                const char *buf, size_t count)
 526 {
 527         struct scsi_target *starget = transport_class_to_starget(cdev);
 528         struct spi_transport_attrs *tp =
 529                 (struct spi_transport_attrs *)&starget->starget_data;
 530
 531         return store_spi_transport_period_helper(cdev, buf, count,
 532                                                  &tp->min_period);
 533 }
 534
 535
 536 static DEVICE_ATTR(min_period, S_IRUGO,
 537                    show_spi_transport_min_period,
 538                    store_spi_transport_min_period);
 539
 540
 541 static ssize_t show_spi_host_signalling(struct device *cdev,
 542                                         struct device_attribute *attr,
 543                                         char *buf)
 544 {
 545         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 546         struct spi_internal *i = to_spi_internal(shost->transportt);
 547
 548         if (i->f->get_signalling)
 549                 i->f->get_signalling(shost);
 550
 551         return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
 552 }
 553 static ssize_t store_spi_host_signalling(struct device *dev,
 554                                          struct device_attribute *attr,
 555                                          const char *buf, size_t count)
 556 {
 557         struct Scsi_Host *shost = transport_class_to_shost(dev);
 558         struct spi_internal *i = to_spi_internal(shost->transportt);
 559         enum spi_signal_type type = spi_signal_to_value(buf);
 560
 561         if (!i->f->set_signalling)
 562                 return -EINVAL;
 563
 564         if (type != SPI_SIGNAL_UNKNOWN)
 565                 i->f->set_signalling(shost, type);
 566
 567         return count;
 568 }
 569 static DEVICE_ATTR(signalling, S_IRUGO,
 570                    show_spi_host_signalling,
 571                    store_spi_host_signalling);
 572
 573 #define DV_SET(x, y)                    \
 574         if(i->f->set_##x)               \
 575                 i->f->set_##x(sdev->sdev_target, y)
 576
 577 enum spi_compare_returns {
 578         SPI_COMPARE_SUCCESS,
 579         SPI_COMPARE_FAILURE,
 580         SPI_COMPARE_SKIP_TEST,
 581 };
 582
 583
 584 /* This is for read/write Domain Validation:  If the device supports
 585  * an echo buffer, we do read/write tests to it */
 586 static enum spi_compare_returns
 587 spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,
 588                           u8 *ptr, const int retries)
 589 {
 590         int len = ptr - buffer;
 591         int j, k, r, result;
 592         unsigned int pattern = 0x0000ffff;
 593         struct scsi_sense_hdr sshdr;
 594
 595         const char spi_write_buffer[] = {
 596                 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 597         };
 598         const char spi_read_buffer[] = {
 599                 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 600         };
 601
 602         /* set up the pattern buffer.  Doesn't matter if we spill
 603          * slightly beyond since that's where the read buffer is */
 604         for (j = 0; j < len; ) {
 605
 606                 /* fill the buffer with counting (test a) */
 607                 for ( ; j < min(len, 32); j++)
 608                         buffer[j] = j;
 609                 k = j;
 610                 /* fill the buffer with alternating words of 0x0 and
 611                  * 0xffff (test b) */
 612                 for ( ; j < min(len, k + 32); j += 2) {
 613                         u16 *word = (u16 *)&buffer[j];
 614
 615                         *word = (j & 0x02) ? 0x0000 : 0xffff;
 616                 }
 617                 k = j;
 618                 /* fill with crosstalk (alternating 0x5555 0xaaa)
 619                  * (test c) */
 620                 for ( ; j < min(len, k + 32); j += 2) {
 621                         u16 *word = (u16 *)&buffer[j];
 622
 623                         *word = (j & 0x02) ? 0x5555 : 0xaaaa;
 624                 }
 625                 k = j;
 626                 /* fill with shifting bits (test d) */
 627                 for ( ; j < min(len, k + 32); j += 4) {
 628                         u32 *word = (unsigned int *)&buffer[j];
 629                         u32 roll = (pattern & 0x80000000) ? 1 : 0;
 630
 631                         *word = pattern;
 632                         pattern = (pattern << 1) | roll;
 633                 }
 634                 /* don't bother with random data (test e) */
 635         }
 636
 637         for (r = 0; r < retries; r++) {
 638                 result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE,
 639                                      buffer, len, &sshdr);
 640                 if(result || !scsi_device_online(sdev)) {
 641
 642                         scsi_device_set_state(sdev, SDEV_QUIESCE);
 643                         if (scsi_sense_valid(&sshdr)
 644                             && sshdr.sense_key == ILLEGAL_REQUEST
 645                             /* INVALID FIELD IN CDB */
 646                             && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
 647                                 /* This would mean that the drive lied
 648                                  * to us about supporting an echo
 649                                  * buffer (unfortunately some Western
 650                                  * Digital drives do precisely this)
 651                                  */
 652                                 return SPI_COMPARE_SKIP_TEST;
 653
 654
 655                         sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
 656                         return SPI_COMPARE_FAILURE;
 657                 }
 658
 659                 memset(ptr, 0, len);
 660                 spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE,
 661                             ptr, len, NULL);
 662                 scsi_device_set_state(sdev, SDEV_QUIESCE);
 663
 664                 if (memcmp(buffer, ptr, len) != 0)
 665                         return SPI_COMPARE_FAILURE;
 666         }
 667         return SPI_COMPARE_SUCCESS;
 668 }
 669
 670 /* This is for the simplest form of Domain Validation: a read test
 671  * on the inquiry data from the device */
 672 static enum spi_compare_returns
 673 spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,
 674                               u8 *ptr, const int retries)
 675 {
 676         int r, result;
 677         const int len = sdev->inquiry_len;
 678         const char spi_inquiry[] = {
 679                 INQUIRY, 0, 0, 0, len, 0
 680         };
 681
 682         for (r = 0; r < retries; r++) {
 683                 memset(ptr, 0, len);
 684
 685                 result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE,
 686                                      ptr, len, NULL);
 687
 688                 if(result || !scsi_device_online(sdev)) {
 689                         scsi_device_set_state(sdev, SDEV_QUIESCE);
 690                         return SPI_COMPARE_FAILURE;
 691                 }
 692
 693                 /* If we don't have the inquiry data already, the
 694                  * first read gets it */
 695                 if (ptr == buffer) {
 696                         ptr += len;
 697                         --r;
 698                         continue;
 699                 }
 700
 701                 if (memcmp(buffer, ptr, len) != 0)
 702                         /* failure */
 703                         return SPI_COMPARE_FAILURE;
 704         }
 705         return SPI_COMPARE_SUCCESS;
 706 }
 707
 708 static enum spi_compare_returns
 709 spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,
 710                enum spi_compare_returns
 711                (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
 712 {
 713         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 714         struct scsi_target *starget = sdev->sdev_target;
 715         int period = 0, prevperiod = 0;
 716         enum spi_compare_returns retval;
 717
 718
 719         for (;;) {
 720                 int newperiod;
 721                 retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
 722
 723                 if (retval == SPI_COMPARE_SUCCESS
 724                     || retval == SPI_COMPARE_SKIP_TEST)
 725                         break;
 726
 727                 /* OK, retrain, fallback */
 728                 if (i->f->get_iu)
 729                         i->f->get_iu(starget);
 730                 if (i->f->get_qas)
 731                         i->f->get_qas(starget);
 732                 if (i->f->get_period)
 733                         i->f->get_period(sdev->sdev_target);
 734
 735                 /* Here's the fallback sequence; first try turning off
 736                  * IU, then QAS (if we can control them), then finally
 737                  * fall down the periods */
 738                 if (i->f->set_iu && spi_iu(starget)) {
 739                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n");
 740                         DV_SET(iu, 0);
 741                 } else if (i->f->set_qas && spi_qas(starget)) {
 742                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n");
 743                         DV_SET(qas, 0);
 744                 } else {
 745                         newperiod = spi_period(starget);
 746                         period = newperiod > period ? newperiod : period;
 747                         if (period < 0x0d)
 748                                 period++;
 749                         else
 750                                 period += period >> 1;
 751
 752                         if (unlikely(period > 0xff || period == prevperiod)) {
 753                                 /* Total failure; set to async and return */
 754                                 starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
 755                                 DV_SET(offset, 0);
 756                                 return SPI_COMPARE_FAILURE;
 757                         }
 758                         starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");
 759                         DV_SET(period, period);
 760                         prevperiod = period;
 761                 }
 762         }
 763         return retval;
 764 }
 765
 766 static int
 767 spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)
 768 {
 769         int l, result;
 770
 771         /* first off do a test unit ready.  This can error out
 772          * because of reservations or some other reason.  If it
 773          * fails, the device won't let us write to the echo buffer
 774          * so just return failure */
 775
 776         const char spi_test_unit_ready[] = {
 777                 TEST_UNIT_READY, 0, 0, 0, 0, 0
 778         };
 779
 780         const char spi_read_buffer_descriptor[] = {
 781                 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
 782         };
 783
 784
 785         /* We send a set of three TURs to clear any outstanding
 786          * unit attention conditions if they exist (Otherwise the
 787          * buffer tests won't be happy).  If the TUR still fails
 788          * (reservation conflict, device not ready, etc) just
 789          * skip the write tests */
 790         for (l = 0; ; l++) {
 791                 result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE,
 792                                      NULL, 0, NULL);
 793
 794                 if(result) {
 795                         if(l >= 3)
 796                                 return 0;
 797                 } else {
 798                         /* TUR succeeded */
 799                         break;
 800                 }
 801         }
 802
 803         result = spi_execute(sdev, spi_read_buffer_descriptor,
 804                              DMA_FROM_DEVICE, buffer, 4, NULL);
 805
 806         if (result)
 807                 /* Device has no echo buffer */
 808                 return 0;
 809
 810         return buffer[3] + ((buffer[2] & 0x1f) << 8);
 811 }
 812
 813 static void
 814 spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
 815 {
 816         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 817         struct scsi_target *starget = sdev->sdev_target;
 818         struct Scsi_Host *shost = sdev->host;
 819         int len = sdev->inquiry_len;
 820         int min_period = spi_min_period(starget);
 821         int max_width = spi_max_width(starget);
 822         /* first set us up for narrow async */
 823         DV_SET(offset, 0);
 824         DV_SET(width, 0);
 825
 826         if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
 827             != SPI_COMPARE_SUCCESS) {
 828                 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
 829                 /* FIXME: should probably offline the device here? */
 830                 return;
 831         }
 832
 833         if (!scsi_device_wide(sdev)) {
 834                 spi_max_width(starget) = 0;
 835                 max_width = 0;
 836         }
 837
 838         /* test width */
 839         if (i->f->set_width && max_width) {
 840                 i->f->set_width(starget, 1);
 841
 842                 if (spi_dv_device_compare_inquiry(sdev, buffer,
 843                                                    buffer + len,
 844                                                    DV_LOOPS)
 845                     != SPI_COMPARE_SUCCESS) {
 846                         starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
 847                         i->f->set_width(starget, 0);
 848                         /* Make sure we don't force wide back on by asking
 849                          * for a transfer period that requires it */
 850                         max_width = 0;
 851                         if (min_period < 10)
 852                                 min_period = 10;
 853                 }
 854         }
 855
 856         if (!i->f->set_period)
 857                 return;
 858
 859         /* device can't handle synchronous */
 860         if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev))
 861                 return;
 862
 863         /* len == -1 is the signal that we need to ascertain the
 864          * presence of an echo buffer before trying to use it.  len ==
 865          * 0 means we don't have an echo buffer */
 866         len = -1;
 867
 868  retry:
 869
 870         /* now set up to the maximum */
 871         DV_SET(offset, spi_max_offset(starget));
 872         DV_SET(period, min_period);
 873
 874         /* try QAS requests; this should be harmless to set if the
 875          * target supports it */
 876         if (scsi_device_qas(sdev)) {
 877                 DV_SET(qas, 1);
 878         } else {
 879                 DV_SET(qas, 0);
 880         }
 881
 882         if (scsi_device_ius(sdev) && min_period < 9) {
 883                 /* This u320 (or u640). Set IU transfers */
 884                 DV_SET(iu, 1);
 885                 /* Then set the optional parameters */
 886                 DV_SET(rd_strm, 1);
 887                 DV_SET(wr_flow, 1);
 888                 DV_SET(rti, 1);
 889                 if (min_period == 8)
 890                         DV_SET(pcomp_en, 1);
 891         } else {
 892                 DV_SET(iu, 0);
 893         }
 894
 895         /* now that we've done all this, actually check the bus
 896          * signal type (if known).  Some devices are stupid on
 897          * a SE bus and still claim they can try LVD only settings */
 898         if (i->f->get_signalling)
 899                 i->f->get_signalling(shost);
 900         if (spi_signalling(shost) == SPI_SIGNAL_SE ||
 901             spi_signalling(shost) == SPI_SIGNAL_HVD ||
 902             !scsi_device_dt(sdev)) {
 903                 DV_SET(dt, 0);
 904         } else {
 905                 DV_SET(dt, 1);
 906         }
 907         /* set width last because it will pull all the other
 908          * parameters down to required values */
 909         DV_SET(width, max_width);
 910
 911         /* Do the read only INQUIRY tests */
 912         spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
 913                        spi_dv_device_compare_inquiry);
 914         /* See if we actually managed to negotiate and sustain DT */
 915         if (i->f->get_dt)
 916                 i->f->get_dt(starget);
 917
 918         /* see if the device has an echo buffer.  If it does we can do
 919          * the SPI pattern write tests.  Because of some broken
 920          * devices, we *only* try this on a device that has actually
 921          * negotiated DT */
 922
 923         if (len == -1 && spi_dt(starget))
 924                 len = spi_dv_device_get_echo_buffer(sdev, buffer);
 925
 926         if (len <= 0) {
 927                 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
 928                 return;
 929         }
 930
 931         if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
 932                 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
 933                 len = SPI_MAX_ECHO_BUFFER_SIZE;
 934         }
 935
 936         if (spi_dv_retrain(sdev, buffer, buffer + len,
 937                            spi_dv_device_echo_buffer)
 938             == SPI_COMPARE_SKIP_TEST) {
 939                 /* OK, the stupid drive can't do a write echo buffer
 940                  * test after all, fall back to the read tests */
 941                 len = 0;
 942                 goto retry;
 943         }
 944 }
 945
 946
 947 /**     spi_dv_device - Do Domain Validation on the device
 948  *      @sdev:          scsi device to validate
 949  *
 950  *      Performs the domain validation on the given device in the
 951  *      current execution thread.  Since DV operations may sleep,
 952  *      the current thread must have user context.  Also no SCSI
 953  *      related locks that would deadlock I/O issued by the DV may
 954  *      be held.
 955  */
 956 void
 957 spi_dv_device(struct scsi_device *sdev)
 958 {
 959         struct scsi_target *starget = sdev->sdev_target;
 960         u8 *buffer;
 961         const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
 962
 963         if (unlikely(scsi_device_get(sdev)))
 964                 return;
 965
 966         if (unlikely(spi_dv_in_progress(starget)))
 967                 return;
 968         spi_dv_in_progress(starget) = 1;
 969
 970         buffer = kzalloc(len, GFP_KERNEL);
 971
 972         if (unlikely(!buffer))
 973                 goto out_put;
 974
 975         /* We need to verify that the actual device will quiesce; the
 976          * later target quiesce is just a nice to have */
 977         if (unlikely(scsi_device_quiesce(sdev)))
 978                 goto out_free;
 979
 980         scsi_target_quiesce(starget);
 981
 982         spi_dv_pending(starget) = 1;
 983         mutex_lock(&spi_dv_mutex(starget));
 984
 985         starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
 986
 987         spi_dv_device_internal(sdev, buffer);
 988
 989         starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
 990
 991         mutex_unlock(&spi_dv_mutex(starget));
 992         spi_dv_pending(starget) = 0;
 993
 994         scsi_target_resume(starget);
 995
 996         spi_initial_dv(starget) = 1;
 997
 998  out_free:
 999         kfree(buffer);
1000  out_put:
1001         spi_dv_in_progress(starget) = 0;
1002         scsi_device_put(sdev);
1003 }
1004 EXPORT_SYMBOL(spi_dv_device);
1005
1006 struct work_queue_wrapper {
1007         struct work_struct      work;
1008         struct scsi_device      *sdev;
1009 };
1010
1011 static void
1012 spi_dv_device_work_wrapper(struct work_struct *work)
1013 {
1014         struct work_queue_wrapper *wqw =
1015                 container_of(work, struct work_queue_wrapper, work);
1016         struct scsi_device *sdev = wqw->sdev;
1017
1018         kfree(wqw);
1019         spi_dv_device(sdev);
1020         spi_dv_pending(sdev->sdev_target) = 0;
1021         scsi_device_put(sdev);
1022 }
1023
1024
1025 /**
1026  *      spi_schedule_dv_device - schedule domain validation to occur on the device
1027  *      @sdev:  The device to validate
1028  *
1029  *      Identical to spi_dv_device() above, except that the DV will be
1030  *      scheduled to occur in a workqueue later.  All memory allocations
1031  *      are atomic, so may be called from any context including those holding
1032  *      SCSI locks.
1033  */
1034 void
1035 spi_schedule_dv_device(struct scsi_device *sdev)
1036 {
1037         struct work_queue_wrapper *wqw =
1038                 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
1039
1040         if (unlikely(!wqw))
1041                 return;
1042
1043         if (unlikely(spi_dv_pending(sdev->sdev_target))) {
1044                 kfree(wqw);
1045                 return;
1046         }
1047         /* Set pending early (dv_device doesn't check it, only sets it) */
1048         spi_dv_pending(sdev->sdev_target) = 1;
1049         if (unlikely(scsi_device_get(sdev))) {
1050                 kfree(wqw);
1051                 spi_dv_pending(sdev->sdev_target) = 0;
1052                 return;
1053         }
1054
1055         INIT_WORK(&wqw->work, spi_dv_device_work_wrapper);
1056         wqw->sdev = sdev;
1057
1058         schedule_work(&wqw->work);
1059 }
1060 EXPORT_SYMBOL(spi_schedule_dv_device);
1061
1062 /**
1063  * spi_display_xfer_agreement - Print the current target transfer agreement
1064  * @starget: The target for which to display the agreement
1065  *
1066  * Each SPI port is required to maintain a transfer agreement for each
1067  * other port on the bus.  This function prints a one-line summary of
1068  * the current agreement; more detailed information is available in sysfs.
1069  */
1070 void spi_display_xfer_agreement(struct scsi_target *starget)
1071 {
1072         struct spi_transport_attrs *tp;
1073         tp = (struct spi_transport_attrs *)&starget->starget_data;
1074
1075         if (tp->offset > 0 && tp->period > 0) {
1076                 unsigned int picosec, kb100;
1077                 char *scsi = "FAST-?";
1078                 char tmp[8];
1079
1080                 if (tp->period <= SPI_STATIC_PPR) {
1081                         picosec = ppr_to_ps[tp->period];
1082                         switch (tp->period) {
1083                                 case  7: scsi = "FAST-320"; break;
1084                                 case  8: scsi = "FAST-160"; break;
1085                                 case  9: scsi = "FAST-80"; break;
1086                                 case 10:
1087                                 case 11: scsi = "FAST-40"; break;
1088                                 case 12: scsi = "FAST-20"; break;
1089                         }
1090                 } else {
1091                         picosec = tp->period * 4000;
1092                         if (tp->period < 25)
1093                                 scsi = "FAST-20";
1094                         else if (tp->period < 50)
1095                                 scsi = "FAST-10";
1096                         else
1097                                 scsi = "FAST-5";
1098                 }
1099
1100                 kb100 = (10000000 + picosec / 2) / picosec;
1101                 if (tp->width)
1102                         kb100 *= 2;
1103                 sprint_frac(tmp, picosec, 1000);
1104
1105                 dev_info(&starget->dev,
1106                          "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1107                          scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1108                          tp->dt ? "DT" : "ST",
1109                          tp->iu ? " IU" : "",
1110                          tp->qas  ? " QAS" : "",
1111                          tp->rd_strm ? " RDSTRM" : "",
1112                          tp->rti ? " RTI" : "",
1113                          tp->wr_flow ? " WRFLOW" : "",
1114                          tp->pcomp_en ? " PCOMP" : "",
1115                          tp->hold_mcs ? " HMCS" : "",
1116                          tmp, tp->offset);
1117         } else {
1118                 dev_info(&starget->dev, "%sasynchronous\n",
1119                                 tp->width ? "wide " : "");
1120         }
1121 }
1122 EXPORT_SYMBOL(spi_display_xfer_agreement);
1123
1124 int spi_populate_width_msg(unsigned char *msg, int width)
1125 {
1126         msg[0] = EXTENDED_MESSAGE;
1127         msg[1] = 2;
1128         msg[2] = EXTENDED_WDTR;
1129         msg[3] = width;
1130         return 4;
1131 }
1132 EXPORT_SYMBOL_GPL(spi_populate_width_msg);
1133
1134 int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
1135 {
1136         msg[0] = EXTENDED_MESSAGE;
1137         msg[1] = 3;
1138         msg[2] = EXTENDED_SDTR;
1139         msg[3] = period;
1140         msg[4] = offset;
1141         return 5;
1142 }
1143 EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
1144
1145 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
1146                 int width, int options)
1147 {
1148         msg[0] = EXTENDED_MESSAGE;
1149         msg[1] = 6;
1150         msg[2] = EXTENDED_PPR;
1151         msg[3] = period;
1152         msg[4] = 0;
1153         msg[5] = offset;
1154         msg[6] = width;
1155         msg[7] = options;
1156         return 8;
1157 }
1158 EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
1159
1160 #ifdef CONFIG_SCSI_CONSTANTS
1161 static const char * const one_byte_msgs[] = {
1162 /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",
1163 /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error",
1164 /* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",
1165 /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1166 /* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set",
1167 /* 0x0f */ "Initiate Recovery", "Release Recovery",
1168 /* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",
1169 /* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"
1170 };
1171
1172 static const char * const two_byte_msgs[] = {
1173 /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
1174 /* 0x23 */ "Ignore Wide Residue", "ACA"
1175 };
1176
1177 static const char * const extended_msgs[] = {
1178 /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1179 /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",
1180 /* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"
1181 };
1182
1183 static void print_nego(const unsigned char *msg, int per, int off, int width)
1184 {
1185         if (per) {
1186                 char buf[20];
1187                 period_to_str(buf, msg[per]);
1188                 printk("period = %s ns ", buf);
1189         }
1190
1191         if (off)
1192                 printk("offset = %d ", msg[off]);
1193         if (width)
1194                 printk("width = %d ", 8 << msg[width]);
1195 }
1196
1197 static void print_ptr(const unsigned char *msg, int msb, const char *desc)
1198 {
1199         int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |
1200                         msg[msb+3];
1201         printk("%s = %d ", desc, ptr);
1202 }
1203
1204 int spi_print_msg(const unsigned char *msg)
1205 {
1206         int len = 1, i;
1207         if (msg[0] == EXTENDED_MESSAGE) {
1208                 len = 2 + msg[1];
1209                 if (len == 2)
1210                         len += 256;
1211                 if (msg[2] < ARRAY_SIZE(extended_msgs))
1212                         printk ("%s ", extended_msgs[msg[2]]);
1213                 else
1214                         printk ("Extended Message, reserved code (0x%02x) ",
1215                                 (int) msg[2]);
1216                 switch (msg[2]) {
1217                 case EXTENDED_MODIFY_DATA_POINTER:
1218                         print_ptr(msg, 3, "pointer");
1219                         break;
1220                 case EXTENDED_SDTR:
1221                         print_nego(msg, 3, 4, 0);
1222                         break;
1223                 case EXTENDED_WDTR:
1224                         print_nego(msg, 0, 0, 3);
1225                         break;
1226                 case EXTENDED_PPR:
1227                         print_nego(msg, 3, 5, 6);
1228                         break;
1229                 case EXTENDED_MODIFY_BIDI_DATA_PTR:
1230                         print_ptr(msg, 3, "out");
1231                         print_ptr(msg, 7, "in");
1232                         break;
1233                 default:
1234                 for (i = 2; i < len; ++i)
1235                         printk("%02x ", msg[i]);
1236                 }
1237         /* Identify */
1238         } else if (msg[0] & 0x80) {
1239                 printk("Identify disconnect %sallowed %s %d ",
1240                         (msg[0] & 0x40) ? "" : "not ",
1241                         (msg[0] & 0x20) ? "target routine" : "lun",
1242                         msg[0] & 0x7);
1243         /* Normal One byte */
1244         } else if (msg[0] < 0x1f) {
1245                 if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])
1246                         printk("%s ", one_byte_msgs[msg[0]]);
1247                 else
1248                         printk("reserved (%02x) ", msg[0]);
1249         } else if (msg[0] == 0x55) {
1250                 printk("QAS Request ");
1251         /* Two byte */
1252         } else if (msg[0] <= 0x2f) {
1253                 if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))
1254                         printk("%s %02x ", two_byte_msgs[msg[0] - 0x20],
1255                                 msg[1]);
1256                 else
1257                         printk("reserved two byte (%02x %02x) ",
1258                                 msg[0], msg[1]);
1259                 len = 2;
1260         } else
1261                 printk("reserved ");
1262         return len;
1263 }
1264 EXPORT_SYMBOL(spi_print_msg);
1265
1266 #else  /* ifndef CONFIG_SCSI_CONSTANTS */
1267
1268 int spi_print_msg(const unsigned char *msg)
1269 {
1270         int len = 1, i;
1271
1272         if (msg[0] == EXTENDED_MESSAGE) {
1273                 len = 2 + msg[1];
1274                 if (len == 2)
1275                         len += 256;
1276                 for (i = 0; i < len; ++i)
1277                         printk("%02x ", msg[i]);
1278         /* Identify */
1279         } else if (msg[0] & 0x80) {
1280                 printk("%02x ", msg[0]);
1281         /* Normal One byte */
1282         } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {
1283                 printk("%02x ", msg[0]);
1284         /* Two byte */
1285         } else if (msg[0] <= 0x2f) {
1286                 printk("%02x %02x", msg[0], msg[1]);
1287                 len = 2;
1288         } else
1289                 printk("%02x ", msg[0]);
1290         return len;
1291 }
1292 EXPORT_SYMBOL(spi_print_msg);
1293 #endif /* ! CONFIG_SCSI_CONSTANTS */
1294
1295 static int spi_device_match(struct attribute_container *cont,
1296                             struct device *dev)
1297 {
1298         struct scsi_device *sdev;
1299         struct Scsi_Host *shost;
1300         struct spi_internal *i;
1301
1302         if (!scsi_is_sdev_device(dev))
1303                 return 0;
1304
1305         sdev = to_scsi_device(dev);
1306         shost = sdev->host;
1307         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1308             != &spi_host_class.class)
1309                 return 0;
1310         /* Note: this class has no device attributes, so it has
1311          * no per-HBA allocation and thus we don't need to distinguish
1312          * the attribute containers for the device */
1313         i = to_spi_internal(shost->transportt);
1314         if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1315                 return 0;
1316         return 1;
1317 }
1318
1319 static int spi_target_match(struct attribute_container *cont,
1320                             struct device *dev)
1321 {
1322         struct Scsi_Host *shost;
1323         struct scsi_target *starget;
1324         struct spi_internal *i;
1325
1326         if (!scsi_is_target_device(dev))
1327                 return 0;
1328
1329         shost = dev_to_shost(dev->parent);
1330         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1331             != &spi_host_class.class)
1332                 return 0;
1333
1334         i = to_spi_internal(shost->transportt);
1335         starget = to_scsi_target(dev);
1336
1337         if (i->f->deny_binding && i->f->deny_binding(starget))
1338                 return 0;
1339
1340         return &i->t.target_attrs.ac == cont;
1341 }
1342
1343 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1344                                "spi_transport",
1345                                spi_setup_transport_attrs,
1346                                NULL,
1347                                spi_target_configure);
1348
1349 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1350                                     spi_device_match,
1351                                     spi_device_configure);
1352
1353 static struct attribute *host_attributes[] = {
1354         &dev_attr_signalling.attr,
1355         NULL
1356 };
1357
1358 static struct attribute_group host_attribute_group = {
1359         .attrs = host_attributes,
1360 };
1361
1362 static int spi_host_configure(struct transport_container *tc,
1363                               struct device *dev,
1364                               struct device *cdev)
1365 {
1366         struct kobject *kobj = &cdev->kobj;
1367         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1368         struct spi_internal *si = to_spi_internal(shost->transportt);
1369         struct attribute *attr = &dev_attr_signalling.attr;
1370         int rc = 0;
1371
1372         if (si->f->set_signalling)
1373                 rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR);
1374
1375         return rc;
1376 }
1377
1378 /* returns true if we should be showing the variable.  Also
1379  * overloads the return by setting 1<<1 if the attribute should
1380  * be writeable */
1381 #define TARGET_ATTRIBUTE_HELPER(name) \
1382         (si->f->show_##name ? S_IRUGO : 0) | \
1383         (si->f->set_##name ? S_IWUSR : 0)
1384
1385 static mode_t target_attribute_is_visible(struct kobject *kobj,
1386                                           struct attribute *attr, int i)
1387 {
1388         struct device *cdev = container_of(kobj, struct device, kobj);
1389         struct scsi_target *starget = transport_class_to_starget(cdev);
1390         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1391         struct spi_internal *si = to_spi_internal(shost->transportt);
1392
1393         if (attr == &dev_attr_period.attr &&
1394             spi_support_sync(starget))
1395                 return TARGET_ATTRIBUTE_HELPER(period);
1396         else if (attr == &dev_attr_min_period.attr &&
1397                  spi_support_sync(starget))
1398                 return TARGET_ATTRIBUTE_HELPER(period);
1399         else if (attr == &dev_attr_offset.attr &&
1400                  spi_support_sync(starget))
1401                 return TARGET_ATTRIBUTE_HELPER(offset);
1402         else if (attr == &dev_attr_max_offset.attr &&
1403                  spi_support_sync(starget))
1404                 return TARGET_ATTRIBUTE_HELPER(offset);
1405         else if (attr == &dev_attr_width.attr &&
1406                  spi_support_wide(starget))
1407                 return TARGET_ATTRIBUTE_HELPER(width);
1408         else if (attr == &dev_attr_max_width.attr &&
1409                  spi_support_wide(starget))
1410                 return TARGET_ATTRIBUTE_HELPER(width);
1411         else if (attr == &dev_attr_iu.attr &&
1412                  spi_support_ius(starget))
1413                 return TARGET_ATTRIBUTE_HELPER(iu);
1414         else if (attr == &dev_attr_dt.attr &&
1415                  spi_support_dt(starget))
1416                 return TARGET_ATTRIBUTE_HELPER(dt);
1417         else if (attr == &dev_attr_qas.attr &&
1418                  spi_support_qas(starget))
1419                 return TARGET_ATTRIBUTE_HELPER(qas);
1420         else if (attr == &dev_attr_wr_flow.attr &&
1421                  spi_support_ius(starget))
1422                 return TARGET_ATTRIBUTE_HELPER(wr_flow);
1423         else if (attr == &dev_attr_rd_strm.attr &&
1424                  spi_support_ius(starget))
1425                 return TARGET_ATTRIBUTE_HELPER(rd_strm);
1426         else if (attr == &dev_attr_rti.attr &&
1427                  spi_support_ius(starget))
1428                 return TARGET_ATTRIBUTE_HELPER(rti);
1429         else if (attr == &dev_attr_pcomp_en.attr &&
1430                  spi_support_ius(starget))
1431                 return TARGET_ATTRIBUTE_HELPER(pcomp_en);
1432         else if (attr == &dev_attr_hold_mcs.attr &&
1433                  spi_support_ius(starget))
1434                 return TARGET_ATTRIBUTE_HELPER(hold_mcs);
1435         else if (attr == &dev_attr_revalidate.attr)
1436                 return S_IWUSR;
1437
1438         return 0;
1439 }
1440
1441 static struct attribute *target_attributes[] = {
1442         &dev_attr_period.attr,
1443         &dev_attr_min_period.attr,
1444         &dev_attr_offset.attr,
1445         &dev_attr_max_offset.attr,
1446         &dev_attr_width.attr,
1447         &dev_attr_max_width.attr,
1448         &dev_attr_iu.attr,
1449         &dev_attr_dt.attr,
1450         &dev_attr_qas.attr,
1451         &dev_attr_wr_flow.attr,
1452         &dev_attr_rd_strm.attr,
1453         &dev_attr_rti.attr,
1454         &dev_attr_pcomp_en.attr,
1455         &dev_attr_hold_mcs.attr,
1456         &dev_attr_revalidate.attr,
1457         NULL
1458 };
1459
1460 static struct attribute_group target_attribute_group = {
1461         .attrs = target_attributes,
1462         .is_visible = target_attribute_is_visible,
1463 };
1464
1465 static int spi_target_configure(struct transport_container *tc,
1466                                 struct device *dev,
1467                                 struct device *cdev)
1468 {
1469         struct kobject *kobj = &cdev->kobj;
1470
1471         /* force an update based on parameters read from the device */
1472         sysfs_update_group(kobj, &target_attribute_group);
1473
1474         return 0;
1475 }
1476
1477 struct scsi_transport_template *
1478 spi_attach_transport(struct spi_function_template *ft)
1479 {
1480         struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
1481                                          GFP_KERNEL);
1482
1483         if (unlikely(!i))
1484                 return NULL;
1485
1486         i->t.target_attrs.ac.class = &spi_transport_class.class;
1487         i->t.target_attrs.ac.grp = &target_attribute_group;
1488         i->t.target_attrs.ac.match = spi_target_match;
1489         transport_container_register(&i->t.target_attrs);
1490         i->t.target_size = sizeof(struct spi_transport_attrs);
1491         i->t.host_attrs.ac.class = &spi_host_class.class;
1492         i->t.host_attrs.ac.grp = &host_attribute_group;
1493         i->t.host_attrs.ac.match = spi_host_match;
1494         transport_container_register(&i->t.host_attrs);
1495         i->t.host_size = sizeof(struct spi_host_attrs);
1496         i->f = ft;
1497
1498         return &i->t;
1499 }
1500 EXPORT_SYMBOL(spi_attach_transport);
1501
1502 void spi_release_transport(struct scsi_transport_template *t)
1503 {
1504         struct spi_internal *i = to_spi_internal(t);
1505
1506         transport_container_unregister(&i->t.target_attrs);
1507         transport_container_unregister(&i->t.host_attrs);
1508
1509         kfree(i);
1510 }
1511 EXPORT_SYMBOL(spi_release_transport);
1512
1513 static __init int spi_transport_init(void)
1514 {
1515         int error = transport_class_register(&spi_transport_class);
1516         if (error)
1517                 return error;
1518         error = anon_transport_class_register(&spi_device_class);
1519         return transport_class_register(&spi_host_class);
1520 }
1521
1522 static void __exit spi_transport_exit(void)
1523 {
1524         transport_class_unregister(&spi_transport_class);
1525         anon_transport_class_unregister(&spi_device_class);
1526         transport_class_unregister(&spi_host_class);
1527 }
1528
1529 MODULE_AUTHOR("Martin Hicks");
1530 MODULE_DESCRIPTION("SPI Transport Attributes");
1531 MODULE_LICENSE("GPL");
1532
1533 module_init(spi_transport_init);
1534 module_exit(spi_transport_exit);