SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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                                       NULL);
 116                 if (driver_byte(result) & DRIVER_SENSE) {
 117                         struct scsi_sense_hdr sshdr_tmp;
 118                         if (!sshdr)
 119                                 sshdr = &sshdr_tmp;
 120
 121                         if (scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE,
 122                                                  sshdr)
 123                             && sshdr->sense_key == UNIT_ATTENTION)
 124                                 continue;
 125                 }
 126                 break;
 127         }
 128         return result;
 129 }
 130
 131 static struct {
 132         enum spi_signal_type    value;
 133         char                    *name;
 134 } signal_types[] = {
 135         { SPI_SIGNAL_UNKNOWN, "unknown" },
 136         { SPI_SIGNAL_SE, "SE" },
 137         { SPI_SIGNAL_LVD, "LVD" },
 138         { SPI_SIGNAL_HVD, "HVD" },
 139 };
 140
 141 static inline const char *spi_signal_to_string(enum spi_signal_type type)
 142 {
 143         int i;
 144
 145         for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 146                 if (type == signal_types[i].value)
 147                         return signal_types[i].name;
 148         }
 149         return NULL;
 150 }
 151 static inline enum spi_signal_type spi_signal_to_value(const char *name)
 152 {
 153         int i, len;
 154
 155         for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 156                 len =  strlen(signal_types[i].name);
 157                 if (strncmp(name, signal_types[i].name, len) == 0 &&
 158                     (name[len] == '\n' || name[len] == '\0'))
 159                         return signal_types[i].value;
 160         }
 161         return SPI_SIGNAL_UNKNOWN;
 162 }
 163
 164 static int spi_host_setup(struct transport_container *tc, struct device *dev,
 165                           struct device *cdev)
 166 {
 167         struct Scsi_Host *shost = dev_to_shost(dev);
 168
 169         spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
 170
 171         return 0;
 172 }
 173
 174 static int spi_host_configure(struct transport_container *tc,
 175                               struct device *dev,
 176                               struct device *cdev);
 177
 178 static DECLARE_TRANSPORT_CLASS(spi_host_class,
 179                                "spi_host",
 180                                spi_host_setup,
 181                                NULL,
 182                                spi_host_configure);
 183
 184 static int spi_host_match(struct attribute_container *cont,
 185                           struct device *dev)
 186 {
 187         struct Scsi_Host *shost;
 188
 189         if (!scsi_is_host_device(dev))
 190                 return 0;
 191
 192         shost = dev_to_shost(dev);
 193         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 194             != &spi_host_class.class)
 195                 return 0;
 196
 197         return &shost->transportt->host_attrs.ac == cont;
 198 }
 199
 200 static int spi_target_configure(struct transport_container *tc,
 201                                 struct device *dev,
 202                                 struct device *cdev);
 203
 204 static int spi_device_configure(struct transport_container *tc,
 205                                 struct device *dev,
 206                                 struct device *cdev)
 207 {
 208         struct scsi_device *sdev = to_scsi_device(dev);
 209         struct scsi_target *starget = sdev->sdev_target;
 210
 211         /* Populate the target capability fields with the values
 212          * gleaned from the device inquiry */
 213
 214         spi_support_sync(starget) = scsi_device_sync(sdev);
 215         spi_support_wide(starget) = scsi_device_wide(sdev);
 216         spi_support_dt(starget) = scsi_device_dt(sdev);
 217         spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
 218         spi_support_ius(starget) = scsi_device_ius(sdev);
 219         spi_support_qas(starget) = scsi_device_qas(sdev);
 220
 221         return 0;
 222 }
 223
 224 static int spi_setup_transport_attrs(struct transport_container *tc,
 225                                      struct device *dev,
 226                                      struct device *cdev)
 227 {
 228         struct scsi_target *starget = to_scsi_target(dev);
 229
 230         spi_period(starget) = -1;       /* illegal value */
 231         spi_min_period(starget) = 0;
 232         spi_offset(starget) = 0;        /* async */
 233         spi_max_offset(starget) = 255;
 234         spi_width(starget) = 0; /* narrow */
 235         spi_max_width(starget) = 1;
 236         spi_iu(starget) = 0;    /* no IU */
 237         spi_max_iu(starget) = 1;
 238         spi_dt(starget) = 0;    /* ST */
 239         spi_qas(starget) = 0;
 240         spi_max_qas(starget) = 1;
 241         spi_wr_flow(starget) = 0;
 242         spi_rd_strm(starget) = 0;
 243         spi_rti(starget) = 0;
 244         spi_pcomp_en(starget) = 0;
 245         spi_hold_mcs(starget) = 0;
 246         spi_dv_pending(starget) = 0;
 247         spi_dv_in_progress(starget) = 0;
 248         spi_initial_dv(starget) = 0;
 249         mutex_init(&spi_dv_mutex(starget));
 250
 251         return 0;
 252 }
 253
 254 #define spi_transport_show_simple(field, format_string)                 \
 255                                                                         \
 256 static ssize_t                                                          \
 257 show_spi_transport_##field(struct device *dev,                  \
 258                            struct device_attribute *attr, char *buf)    \
 259 {                                                                       \
 260         struct scsi_target *starget = transport_class_to_starget(dev);  \
 261         struct spi_transport_attrs *tp;                                 \
 262                                                                         \
 263         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 264         return snprintf(buf, 20, format_string, tp->field);             \
 265 }
 266
 267 #define spi_transport_store_simple(field, format_string)                \
 268                                                                         \
 269 static ssize_t                                                          \
 270 store_spi_transport_##field(struct device *dev,                         \
 271                             struct device_attribute *attr,              \
 272                             const char *buf, size_t count)              \
 273 {                                                                       \
 274         int val;                                                        \
 275         struct scsi_target *starget = transport_class_to_starget(dev);  \
 276         struct spi_transport_attrs *tp;                                 \
 277                                                                         \
 278         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 279         val = simple_strtoul(buf, NULL, 0);                             \
 280         tp->field = val;                                                \
 281         return count;                                                   \
 282 }
 283
 284 #define spi_transport_show_function(field, format_string)               \
 285                                                                         \
 286 static ssize_t                                                          \
 287 show_spi_transport_##field(struct device *dev,                  \
 288                            struct device_attribute *attr, char *buf)    \
 289 {                                                                       \
 290         struct scsi_target *starget = transport_class_to_starget(dev);  \
 291         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 292         struct spi_transport_attrs *tp;                                 \
 293         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 294         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 295         if (i->f->get_##field)                                          \
 296                 i->f->get_##field(starget);                             \
 297         return snprintf(buf, 20, format_string, tp->field);             \
 298 }
 299
 300 #define spi_transport_store_function(field, format_string)              \
 301 static ssize_t                                                          \
 302 store_spi_transport_##field(struct device *dev,                         \
 303                             struct device_attribute *attr,              \
 304                             const char *buf, size_t count)              \
 305 {                                                                       \
 306         int val;                                                        \
 307         struct scsi_target *starget = transport_class_to_starget(dev);  \
 308         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 309         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 310                                                                         \
 311         if (!i->f->set_##field)                                         \
 312                 return -EINVAL;                                         \
 313         val = simple_strtoul(buf, NULL, 0);                             \
 314         i->f->set_##field(starget, val);                                \
 315         return count;                                                   \
 316 }
 317
 318 #define spi_transport_store_max(field, format_string)                   \
 319 static ssize_t                                                          \
 320 store_spi_transport_##field(struct device *dev,                         \
 321                             struct device_attribute *attr,              \
 322                             const char *buf, size_t count)              \
 323 {                                                                       \
 324         int val;                                                        \
 325         struct scsi_target *starget = transport_class_to_starget(dev);  \
 326         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 327         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 328         struct spi_transport_attrs *tp                                  \
 329                 = (struct spi_transport_attrs *)&starget->starget_data; \
 330                                                                         \
 331         if (i->f->set_##field)                                          \
 332                 return -EINVAL;                                         \
 333         val = simple_strtoul(buf, NULL, 0);                             \
 334         if (val > tp->max_##field)                                      \
 335                 val = tp->max_##field;                                  \
 336         i->f->set_##field(starget, val);                                \
 337         return count;                                                   \
 338 }
 339
 340 #define spi_transport_rd_attr(field, format_string)                     \
 341         spi_transport_show_function(field, format_string)               \
 342         spi_transport_store_function(field, format_string)              \
 343 static DEVICE_ATTR(field, S_IRUGO,                              \
 344                    show_spi_transport_##field,                  \
 345                    store_spi_transport_##field);
 346
 347 #define spi_transport_simple_attr(field, format_string)                 \
 348         spi_transport_show_simple(field, format_string)                 \
 349         spi_transport_store_simple(field, format_string)                \
 350 static DEVICE_ATTR(field, S_IRUGO,                              \
 351                    show_spi_transport_##field,                  \
 352                    store_spi_transport_##field);
 353
 354 #define spi_transport_max_attr(field, format_string)                    \
 355         spi_transport_show_function(field, format_string)               \
 356         spi_transport_store_max(field, format_string)                   \
 357         spi_transport_simple_attr(max_##field, format_string)           \
 358 static DEVICE_ATTR(field, S_IRUGO,                              \
 359                    show_spi_transport_##field,                  \
 360                    store_spi_transport_##field);
 361
 362 /* The Parallel SCSI Tranport Attributes: */
 363 spi_transport_max_attr(offset, "%d\n");
 364 spi_transport_max_attr(width, "%d\n");
 365 spi_transport_max_attr(iu, "%d\n");
 366 spi_transport_rd_attr(dt, "%d\n");
 367 spi_transport_max_attr(qas, "%d\n");
 368 spi_transport_rd_attr(wr_flow, "%d\n");
 369 spi_transport_rd_attr(rd_strm, "%d\n");
 370 spi_transport_rd_attr(rti, "%d\n");
 371 spi_transport_rd_attr(pcomp_en, "%d\n");
 372 spi_transport_rd_attr(hold_mcs, "%d\n");
 373
 374 /* we only care about the first child device that's a real SCSI device
 375  * so we return 1 to terminate the iteration when we find it */
 376 static int child_iter(struct device *dev, void *data)
 377 {
 378         if (!scsi_is_sdev_device(dev))
 379                 return 0;
 380
 381         spi_dv_device(to_scsi_device(dev));
 382         return 1;
 383 }
 384
 385 static ssize_t
 386 store_spi_revalidate(struct device *dev, struct device_attribute *attr,
 387                      const char *buf, size_t count)
 388 {
 389         struct scsi_target *starget = transport_class_to_starget(dev);
 390
 391         device_for_each_child(&starget->dev, NULL, child_iter);
 392         return count;
 393 }
 394 static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
 395
 396 /* Translate the period into ns according to the current spec
 397  * for SDTR/PPR messages */
 398 static int period_to_str(char *buf, int period)
 399 {
 400         int len, picosec;
 401
 402         if (period < 0 || period > 0xff) {
 403                 picosec = -1;
 404         } else if (period <= SPI_STATIC_PPR) {
 405                 picosec = ppr_to_ps[period];
 406         } else {
 407                 picosec = period * 4000;
 408         }
 409
 410         if (picosec == -1) {
 411                 len = sprintf(buf, "reserved");
 412         } else {
 413                 len = sprint_frac(buf, picosec, 1000);
 414         }
 415
 416         return len;
 417 }
 418
 419 static ssize_t
 420 show_spi_transport_period_helper(char *buf, int period)
 421 {
 422         int len = period_to_str(buf, period);
 423         buf[len++] = '\n';
 424         buf[len] = '\0';
 425         return len;
 426 }
 427
 428 static ssize_t
 429 store_spi_transport_period_helper(struct device *dev, const char *buf,
 430                                   size_t count, int *periodp)
 431 {
 432         int j, picosec, period = -1;
 433         char *endp;
 434
 435         picosec = simple_strtoul(buf, &endp, 10) * 1000;
 436         if (*endp == '.') {
 437                 int mult = 100;
 438                 do {
 439                         endp++;
 440                         if (!isdigit(*endp))
 441                                 break;
 442                         picosec += (*endp - '0') * mult;
 443                         mult /= 10;
 444                 } while (mult > 0);
 445         }
 446
 447         for (j = 0; j <= SPI_STATIC_PPR; j++) {
 448                 if (ppr_to_ps[j] < picosec)
 449                         continue;
 450                 period = j;
 451                 break;
 452         }
 453
 454         if (period == -1)
 455                 period = picosec / 4000;
 456
 457         if (period > 0xff)
 458                 period = 0xff;
 459
 460         *periodp = period;
 461
 462         return count;
 463 }
 464
 465 static ssize_t
 466 show_spi_transport_period(struct device *dev,
 467                           struct device_attribute *attr, char *buf)
 468 {
 469         struct scsi_target *starget = transport_class_to_starget(dev);
 470         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 471         struct spi_internal *i = to_spi_internal(shost->transportt);
 472         struct spi_transport_attrs *tp =
 473                 (struct spi_transport_attrs *)&starget->starget_data;
 474
 475         if (i->f->get_period)
 476                 i->f->get_period(starget);
 477
 478         return show_spi_transport_period_helper(buf, tp->period);
 479 }
 480
 481 static ssize_t
 482 store_spi_transport_period(struct device *cdev, struct device_attribute *attr,
 483                            const char *buf, size_t count)
 484 {
 485         struct scsi_target *starget = transport_class_to_starget(cdev);
 486         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 487         struct spi_internal *i = to_spi_internal(shost->transportt);
 488         struct spi_transport_attrs *tp =
 489                 (struct spi_transport_attrs *)&starget->starget_data;
 490         int period, retval;
 491
 492         if (!i->f->set_period)
 493                 return -EINVAL;
 494
 495         retval = store_spi_transport_period_helper(cdev, buf, count, &period);
 496
 497         if (period < tp->min_period)
 498                 period = tp->min_period;
 499
 500         i->f->set_period(starget, period);
 501
 502         return retval;
 503 }
 504
 505 static DEVICE_ATTR(period, S_IRUGO,
 506                    show_spi_transport_period,
 507                    store_spi_transport_period);
 508
 509 static ssize_t
 510 show_spi_transport_min_period(struct device *cdev,
 511                               struct device_attribute *attr, char *buf)
 512 {
 513         struct scsi_target *starget = transport_class_to_starget(cdev);
 514         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 515         struct spi_internal *i = to_spi_internal(shost->transportt);
 516         struct spi_transport_attrs *tp =
 517                 (struct spi_transport_attrs *)&starget->starget_data;
 518
 519         if (!i->f->set_period)
 520                 return -EINVAL;
 521
 522         return show_spi_transport_period_helper(buf, tp->min_period);
 523 }
 524
 525 static ssize_t
 526 store_spi_transport_min_period(struct device *cdev,
 527                                struct device_attribute *attr,
 528                                const char *buf, size_t count)
 529 {
 530         struct scsi_target *starget = transport_class_to_starget(cdev);
 531         struct spi_transport_attrs *tp =
 532                 (struct spi_transport_attrs *)&starget->starget_data;
 533
 534         return store_spi_transport_period_helper(cdev, buf, count,
 535                                                  &tp->min_period);
 536 }
 537
 538
 539 static DEVICE_ATTR(min_period, S_IRUGO,
 540                    show_spi_transport_min_period,
 541                    store_spi_transport_min_period);
 542
 543
 544 static ssize_t show_spi_host_signalling(struct device *cdev,
 545                                         struct device_attribute *attr,
 546                                         char *buf)
 547 {
 548         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 549         struct spi_internal *i = to_spi_internal(shost->transportt);
 550
 551         if (i->f->get_signalling)
 552                 i->f->get_signalling(shost);
 553
 554         return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
 555 }
 556 static ssize_t store_spi_host_signalling(struct device *dev,
 557                                          struct device_attribute *attr,
 558                                          const char *buf, size_t count)
 559 {
 560         struct Scsi_Host *shost = transport_class_to_shost(dev);
 561         struct spi_internal *i = to_spi_internal(shost->transportt);
 562         enum spi_signal_type type = spi_signal_to_value(buf);
 563
 564         if (!i->f->set_signalling)
 565                 return -EINVAL;
 566
 567         if (type != SPI_SIGNAL_UNKNOWN)
 568                 i->f->set_signalling(shost, type);
 569
 570         return count;
 571 }
 572 static DEVICE_ATTR(signalling, S_IRUGO,
 573                    show_spi_host_signalling,
 574                    store_spi_host_signalling);
 575
 576 #define DV_SET(x, y)                    \
 577         if(i->f->set_##x)               \
 578                 i->f->set_##x(sdev->sdev_target, y)
 579
 580 enum spi_compare_returns {
 581         SPI_COMPARE_SUCCESS,
 582         SPI_COMPARE_FAILURE,
 583         SPI_COMPARE_SKIP_TEST,
 584 };
 585
 586
 587 /* This is for read/write Domain Validation:  If the device supports
 588  * an echo buffer, we do read/write tests to it */
 589 static enum spi_compare_returns
 590 spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,
 591                           u8 *ptr, const int retries)
 592 {
 593         int len = ptr - buffer;
 594         int j, k, r, result;
 595         unsigned int pattern = 0x0000ffff;
 596         struct scsi_sense_hdr sshdr;
 597
 598         const char spi_write_buffer[] = {
 599                 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 600         };
 601         const char spi_read_buffer[] = {
 602                 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 603         };
 604
 605         /* set up the pattern buffer.  Doesn't matter if we spill
 606          * slightly beyond since that's where the read buffer is */
 607         for (j = 0; j < len; ) {
 608
 609                 /* fill the buffer with counting (test a) */
 610                 for ( ; j < min(len, 32); j++)
 611                         buffer[j] = j;
 612                 k = j;
 613                 /* fill the buffer with alternating words of 0x0 and
 614                  * 0xffff (test b) */
 615                 for ( ; j < min(len, k + 32); j += 2) {
 616                         u16 *word = (u16 *)&buffer[j];
 617
 618                         *word = (j & 0x02) ? 0x0000 : 0xffff;
 619                 }
 620                 k = j;
 621                 /* fill with crosstalk (alternating 0x5555 0xaaa)
 622                  * (test c) */
 623                 for ( ; j < min(len, k + 32); j += 2) {
 624                         u16 *word = (u16 *)&buffer[j];
 625
 626                         *word = (j & 0x02) ? 0x5555 : 0xaaaa;
 627                 }
 628                 k = j;
 629                 /* fill with shifting bits (test d) */
 630                 for ( ; j < min(len, k + 32); j += 4) {
 631                         u32 *word = (unsigned int *)&buffer[j];
 632                         u32 roll = (pattern & 0x80000000) ? 1 : 0;
 633
 634                         *word = pattern;
 635                         pattern = (pattern << 1) | roll;
 636                 }
 637                 /* don't bother with random data (test e) */
 638         }
 639
 640         for (r = 0; r < retries; r++) {
 641                 result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE,
 642                                      buffer, len, &sshdr);
 643                 if(result || !scsi_device_online(sdev)) {
 644
 645                         scsi_device_set_state(sdev, SDEV_QUIESCE);
 646                         if (scsi_sense_valid(&sshdr)
 647                             && sshdr.sense_key == ILLEGAL_REQUEST
 648                             /* INVALID FIELD IN CDB */
 649                             && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
 650                                 /* This would mean that the drive lied
 651                                  * to us about supporting an echo
 652                                  * buffer (unfortunately some Western
 653                                  * Digital drives do precisely this)
 654                                  */
 655                                 return SPI_COMPARE_SKIP_TEST;
 656
 657
 658                         sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
 659                         return SPI_COMPARE_FAILURE;
 660                 }
 661
 662                 memset(ptr, 0, len);
 663                 spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE,
 664                             ptr, len, NULL);
 665                 scsi_device_set_state(sdev, SDEV_QUIESCE);
 666
 667                 if (memcmp(buffer, ptr, len) != 0)
 668                         return SPI_COMPARE_FAILURE;
 669         }
 670         return SPI_COMPARE_SUCCESS;
 671 }
 672
 673 /* This is for the simplest form of Domain Validation: a read test
 674  * on the inquiry data from the device */
 675 static enum spi_compare_returns
 676 spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,
 677                               u8 *ptr, const int retries)
 678 {
 679         int r, result;
 680         const int len = sdev->inquiry_len;
 681         const char spi_inquiry[] = {
 682                 INQUIRY, 0, 0, 0, len, 0
 683         };
 684
 685         for (r = 0; r < retries; r++) {
 686                 memset(ptr, 0, len);
 687
 688                 result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE,
 689                                      ptr, len, NULL);
 690
 691                 if(result || !scsi_device_online(sdev)) {
 692                         scsi_device_set_state(sdev, SDEV_QUIESCE);
 693                         return SPI_COMPARE_FAILURE;
 694                 }
 695
 696                 /* If we don't have the inquiry data already, the
 697                  * first read gets it */
 698                 if (ptr == buffer) {
 699                         ptr += len;
 700                         --r;
 701                         continue;
 702                 }
 703
 704                 if (memcmp(buffer, ptr, len) != 0)
 705                         /* failure */
 706                         return SPI_COMPARE_FAILURE;
 707         }
 708         return SPI_COMPARE_SUCCESS;
 709 }
 710
 711 static enum spi_compare_returns
 712 spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,
 713                enum spi_compare_returns
 714                (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
 715 {
 716         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 717         struct scsi_target *starget = sdev->sdev_target;
 718         int period = 0, prevperiod = 0;
 719         enum spi_compare_returns retval;
 720
 721
 722         for (;;) {
 723                 int newperiod;
 724                 retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
 725
 726                 if (retval == SPI_COMPARE_SUCCESS
 727                     || retval == SPI_COMPARE_SKIP_TEST)
 728                         break;
 729
 730                 /* OK, retrain, fallback */
 731                 if (i->f->get_iu)
 732                         i->f->get_iu(starget);
 733                 if (i->f->get_qas)
 734                         i->f->get_qas(starget);
 735                 if (i->f->get_period)
 736                         i->f->get_period(sdev->sdev_target);
 737
 738                 /* Here's the fallback sequence; first try turning off
 739                  * IU, then QAS (if we can control them), then finally
 740                  * fall down the periods */
 741                 if (i->f->set_iu && spi_iu(starget)) {
 742                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n");
 743                         DV_SET(iu, 0);
 744                 } else if (i->f->set_qas && spi_qas(starget)) {
 745                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n");
 746                         DV_SET(qas, 0);
 747                 } else {
 748                         newperiod = spi_period(starget);
 749                         period = newperiod > period ? newperiod : period;
 750                         if (period < 0x0d)
 751                                 period++;
 752                         else
 753                                 period += period >> 1;
 754
 755                         if (unlikely(period > 0xff || period == prevperiod)) {
 756                                 /* Total failure; set to async and return */
 757                                 starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
 758                                 DV_SET(offset, 0);
 759                                 return SPI_COMPARE_FAILURE;
 760                         }
 761                         starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");
 762                         DV_SET(period, period);
 763                         prevperiod = period;
 764                 }
 765         }
 766         return retval;
 767 }
 768
 769 static int
 770 spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)
 771 {
 772         int l, result;
 773
 774         /* first off do a test unit ready.  This can error out
 775          * because of reservations or some other reason.  If it
 776          * fails, the device won't let us write to the echo buffer
 777          * so just return failure */
 778
 779         const char spi_test_unit_ready[] = {
 780                 TEST_UNIT_READY, 0, 0, 0, 0, 0
 781         };
 782
 783         const char spi_read_buffer_descriptor[] = {
 784                 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
 785         };
 786
 787
 788         /* We send a set of three TURs to clear any outstanding
 789          * unit attention conditions if they exist (Otherwise the
 790          * buffer tests won't be happy).  If the TUR still fails
 791          * (reservation conflict, device not ready, etc) just
 792          * skip the write tests */
 793         for (l = 0; ; l++) {
 794                 result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE,
 795                                      NULL, 0, NULL);
 796
 797                 if(result) {
 798                         if(l >= 3)
 799                                 return 0;
 800                 } else {
 801                         /* TUR succeeded */
 802                         break;
 803                 }
 804         }
 805
 806         result = spi_execute(sdev, spi_read_buffer_descriptor,
 807                              DMA_FROM_DEVICE, buffer, 4, NULL);
 808
 809         if (result)
 810                 /* Device has no echo buffer */
 811                 return 0;
 812
 813         return buffer[3] + ((buffer[2] & 0x1f) << 8);
 814 }
 815
 816 static void
 817 spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
 818 {
 819         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 820         struct scsi_target *starget = sdev->sdev_target;
 821         struct Scsi_Host *shost = sdev->host;
 822         int len = sdev->inquiry_len;
 823         int min_period = spi_min_period(starget);
 824         int max_width = spi_max_width(starget);
 825         /* first set us up for narrow async */
 826         DV_SET(offset, 0);
 827         DV_SET(width, 0);
 828
 829         if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
 830             != SPI_COMPARE_SUCCESS) {
 831                 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
 832                 /* FIXME: should probably offline the device here? */
 833                 return;
 834         }
 835
 836         if (!spi_support_wide(starget)) {
 837                 spi_max_width(starget) = 0;
 838                 max_width = 0;
 839         }
 840
 841         /* test width */
 842         if (i->f->set_width && max_width) {
 843                 i->f->set_width(starget, 1);
 844
 845                 if (spi_dv_device_compare_inquiry(sdev, buffer,
 846                                                    buffer + len,
 847                                                    DV_LOOPS)
 848                     != SPI_COMPARE_SUCCESS) {
 849                         starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
 850                         i->f->set_width(starget, 0);
 851                         /* Make sure we don't force wide back on by asking
 852                          * for a transfer period that requires it */
 853                         max_width = 0;
 854                         if (min_period < 10)
 855                                 min_period = 10;
 856                 }
 857         }
 858
 859         if (!i->f->set_period)
 860                 return;
 861
 862         /* device can't handle synchronous */
 863         if (!spi_support_sync(starget) && !spi_support_dt(starget))
 864                 return;
 865
 866         /* len == -1 is the signal that we need to ascertain the
 867          * presence of an echo buffer before trying to use it.  len ==
 868          * 0 means we don't have an echo buffer */
 869         len = -1;
 870
 871  retry:
 872
 873         /* now set up to the maximum */
 874         DV_SET(offset, spi_max_offset(starget));
 875         DV_SET(period, min_period);
 876
 877         /* try QAS requests; this should be harmless to set if the
 878          * target supports it */
 879         if (spi_support_qas(starget) && spi_max_qas(starget)) {
 880                 DV_SET(qas, 1);
 881         } else {
 882                 DV_SET(qas, 0);
 883         }
 884
 885         if (spi_support_ius(starget) && spi_max_iu(starget) &&
 886             min_period < 9) {
 887                 /* This u320 (or u640). Set IU transfers */
 888                 DV_SET(iu, 1);
 889                 /* Then set the optional parameters */
 890                 DV_SET(rd_strm, 1);
 891                 DV_SET(wr_flow, 1);
 892                 DV_SET(rti, 1);
 893                 if (min_period == 8)
 894                         DV_SET(pcomp_en, 1);
 895         } else {
 896                 DV_SET(iu, 0);
 897         }
 898
 899         /* now that we've done all this, actually check the bus
 900          * signal type (if known).  Some devices are stupid on
 901          * a SE bus and still claim they can try LVD only settings */
 902         if (i->f->get_signalling)
 903                 i->f->get_signalling(shost);
 904         if (spi_signalling(shost) == SPI_SIGNAL_SE ||
 905             spi_signalling(shost) == SPI_SIGNAL_HVD ||
 906             !spi_support_dt(starget)) {
 907                 DV_SET(dt, 0);
 908         } else {
 909                 DV_SET(dt, 1);
 910         }
 911         /* set width last because it will pull all the other
 912          * parameters down to required values */
 913         DV_SET(width, max_width);
 914
 915         /* Do the read only INQUIRY tests */
 916         spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
 917                        spi_dv_device_compare_inquiry);
 918         /* See if we actually managed to negotiate and sustain DT */
 919         if (i->f->get_dt)
 920                 i->f->get_dt(starget);
 921
 922         /* see if the device has an echo buffer.  If it does we can do
 923          * the SPI pattern write tests.  Because of some broken
 924          * devices, we *only* try this on a device that has actually
 925          * negotiated DT */
 926
 927         if (len == -1 && spi_dt(starget))
 928                 len = spi_dv_device_get_echo_buffer(sdev, buffer);
 929
 930         if (len <= 0) {
 931                 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
 932                 return;
 933         }
 934
 935         if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
 936                 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
 937                 len = SPI_MAX_ECHO_BUFFER_SIZE;
 938         }
 939
 940         if (spi_dv_retrain(sdev, buffer, buffer + len,
 941                            spi_dv_device_echo_buffer)
 942             == SPI_COMPARE_SKIP_TEST) {
 943                 /* OK, the stupid drive can't do a write echo buffer
 944                  * test after all, fall back to the read tests */
 945                 len = 0;
 946                 goto retry;
 947         }
 948 }
 949
 950
 951 /**     spi_dv_device - Do Domain Validation on the device
 952  *      @sdev:          scsi device to validate
 953  *
 954  *      Performs the domain validation on the given device in the
 955  *      current execution thread.  Since DV operations may sleep,
 956  *      the current thread must have user context.  Also no SCSI
 957  *      related locks that would deadlock I/O issued by the DV may
 958  *      be held.
 959  */
 960 void
 961 spi_dv_device(struct scsi_device *sdev)
 962 {
 963         struct scsi_target *starget = sdev->sdev_target;
 964         u8 *buffer;
 965         const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
 966
 967         if (unlikely(scsi_device_get(sdev)))
 968                 return;
 969
 970         if (unlikely(spi_dv_in_progress(starget)))
 971                 return;
 972         spi_dv_in_progress(starget) = 1;
 973
 974         buffer = kzalloc(len, GFP_KERNEL);
 975
 976         if (unlikely(!buffer))
 977                 goto out_put;
 978
 979         /* We need to verify that the actual device will quiesce; the
 980          * later target quiesce is just a nice to have */
 981         if (unlikely(scsi_device_quiesce(sdev)))
 982                 goto out_free;
 983
 984         scsi_target_quiesce(starget);
 985
 986         spi_dv_pending(starget) = 1;
 987         mutex_lock(&spi_dv_mutex(starget));
 988
 989         starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
 990
 991         spi_dv_device_internal(sdev, buffer);
 992
 993         starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
 994
 995         mutex_unlock(&spi_dv_mutex(starget));
 996         spi_dv_pending(starget) = 0;
 997
 998         scsi_target_resume(starget);
 999
1000         spi_initial_dv(starget) = 1;
1001
1002  out_free:
1003         kfree(buffer);
1004  out_put:
1005         spi_dv_in_progress(starget) = 0;
1006         scsi_device_put(sdev);
1007 }
1008 EXPORT_SYMBOL(spi_dv_device);
1009
1010 struct work_queue_wrapper {
1011         struct work_struct      work;
1012         struct scsi_device      *sdev;
1013 };
1014
1015 static void
1016 spi_dv_device_work_wrapper(struct work_struct *work)
1017 {
1018         struct work_queue_wrapper *wqw =
1019                 container_of(work, struct work_queue_wrapper, work);
1020         struct scsi_device *sdev = wqw->sdev;
1021
1022         kfree(wqw);
1023         spi_dv_device(sdev);
1024         spi_dv_pending(sdev->sdev_target) = 0;
1025         scsi_device_put(sdev);
1026 }
1027
1028
1029 /**
1030  *      spi_schedule_dv_device - schedule domain validation to occur on the device
1031  *      @sdev:  The device to validate
1032  *
1033  *      Identical to spi_dv_device() above, except that the DV will be
1034  *      scheduled to occur in a workqueue later.  All memory allocations
1035  *      are atomic, so may be called from any context including those holding
1036  *      SCSI locks.
1037  */
1038 void
1039 spi_schedule_dv_device(struct scsi_device *sdev)
1040 {
1041         struct work_queue_wrapper *wqw =
1042                 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
1043
1044         if (unlikely(!wqw))
1045                 return;
1046
1047         if (unlikely(spi_dv_pending(sdev->sdev_target))) {
1048                 kfree(wqw);
1049                 return;
1050         }
1051         /* Set pending early (dv_device doesn't check it, only sets it) */
1052         spi_dv_pending(sdev->sdev_target) = 1;
1053         if (unlikely(scsi_device_get(sdev))) {
1054                 kfree(wqw);
1055                 spi_dv_pending(sdev->sdev_target) = 0;
1056                 return;
1057         }
1058
1059         INIT_WORK(&wqw->work, spi_dv_device_work_wrapper);
1060         wqw->sdev = sdev;
1061
1062         schedule_work(&wqw->work);
1063 }
1064 EXPORT_SYMBOL(spi_schedule_dv_device);
1065
1066 /**
1067  * spi_display_xfer_agreement - Print the current target transfer agreement
1068  * @starget: The target for which to display the agreement
1069  *
1070  * Each SPI port is required to maintain a transfer agreement for each
1071  * other port on the bus.  This function prints a one-line summary of
1072  * the current agreement; more detailed information is available in sysfs.
1073  */
1074 void spi_display_xfer_agreement(struct scsi_target *starget)
1075 {
1076         struct spi_transport_attrs *tp;
1077         tp = (struct spi_transport_attrs *)&starget->starget_data;
1078
1079         if (tp->offset > 0 && tp->period > 0) {
1080                 unsigned int picosec, kb100;
1081                 char *scsi = "FAST-?";
1082                 char tmp[8];
1083
1084                 if (tp->period <= SPI_STATIC_PPR) {
1085                         picosec = ppr_to_ps[tp->period];
1086                         switch (tp->period) {
1087                                 case  7: scsi = "FAST-320"; break;
1088                                 case  8: scsi = "FAST-160"; break;
1089                                 case  9: scsi = "FAST-80"; break;
1090                                 case 10:
1091                                 case 11: scsi = "FAST-40"; break;
1092                                 case 12: scsi = "FAST-20"; break;
1093                         }
1094                 } else {
1095                         picosec = tp->period * 4000;
1096                         if (tp->period < 25)
1097                                 scsi = "FAST-20";
1098                         else if (tp->period < 50)
1099                                 scsi = "FAST-10";
1100                         else
1101                                 scsi = "FAST-5";
1102                 }
1103
1104                 kb100 = (10000000 + picosec / 2) / picosec;
1105                 if (tp->width)
1106                         kb100 *= 2;
1107                 sprint_frac(tmp, picosec, 1000);
1108
1109                 dev_info(&starget->dev,
1110                          "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1111                          scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1112                          tp->dt ? "DT" : "ST",
1113                          tp->iu ? " IU" : "",
1114                          tp->qas  ? " QAS" : "",
1115                          tp->rd_strm ? " RDSTRM" : "",
1116                          tp->rti ? " RTI" : "",
1117                          tp->wr_flow ? " WRFLOW" : "",
1118                          tp->pcomp_en ? " PCOMP" : "",
1119                          tp->hold_mcs ? " HMCS" : "",
1120                          tmp, tp->offset);
1121         } else {
1122                 dev_info(&starget->dev, "%sasynchronous\n",
1123                                 tp->width ? "wide " : "");
1124         }
1125 }
1126 EXPORT_SYMBOL(spi_display_xfer_agreement);
1127
1128 int spi_populate_width_msg(unsigned char *msg, int width)
1129 {
1130         msg[0] = EXTENDED_MESSAGE;
1131         msg[1] = 2;
1132         msg[2] = EXTENDED_WDTR;
1133         msg[3] = width;
1134         return 4;
1135 }
1136 EXPORT_SYMBOL_GPL(spi_populate_width_msg);
1137
1138 int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
1139 {
1140         msg[0] = EXTENDED_MESSAGE;
1141         msg[1] = 3;
1142         msg[2] = EXTENDED_SDTR;
1143         msg[3] = period;
1144         msg[4] = offset;
1145         return 5;
1146 }
1147 EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
1148
1149 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
1150                 int width, int options)
1151 {
1152         msg[0] = EXTENDED_MESSAGE;
1153         msg[1] = 6;
1154         msg[2] = EXTENDED_PPR;
1155         msg[3] = period;
1156         msg[4] = 0;
1157         msg[5] = offset;
1158         msg[6] = width;
1159         msg[7] = options;
1160         return 8;
1161 }
1162 EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
1163
1164 #ifdef CONFIG_SCSI_CONSTANTS
1165 static const char * const one_byte_msgs[] = {
1166 /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",
1167 /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error",
1168 /* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",
1169 /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1170 /* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set",
1171 /* 0x0f */ "Initiate Recovery", "Release Recovery",
1172 /* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",
1173 /* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"
1174 };
1175
1176 static const char * const two_byte_msgs[] = {
1177 /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
1178 /* 0x23 */ "Ignore Wide Residue", "ACA"
1179 };
1180
1181 static const char * const extended_msgs[] = {
1182 /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1183 /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",
1184 /* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"
1185 };
1186
1187 static void print_nego(const unsigned char *msg, int per, int off, int width)
1188 {
1189         if (per) {
1190                 char buf[20];
1191                 period_to_str(buf, msg[per]);
1192                 printk("period = %s ns ", buf);
1193         }
1194
1195         if (off)
1196                 printk("offset = %d ", msg[off]);
1197         if (width)
1198                 printk("width = %d ", 8 << msg[width]);
1199 }
1200
1201 static void print_ptr(const unsigned char *msg, int msb, const char *desc)
1202 {
1203         int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |
1204                         msg[msb+3];
1205         printk("%s = %d ", desc, ptr);
1206 }
1207
1208 int spi_print_msg(const unsigned char *msg)
1209 {
1210         int len = 1, i;
1211         if (msg[0] == EXTENDED_MESSAGE) {
1212                 len = 2 + msg[1];
1213                 if (len == 2)
1214                         len += 256;
1215                 if (msg[2] < ARRAY_SIZE(extended_msgs))
1216                         printk ("%s ", extended_msgs[msg[2]]);
1217                 else
1218                         printk ("Extended Message, reserved code (0x%02x) ",
1219                                 (int) msg[2]);
1220                 switch (msg[2]) {
1221                 case EXTENDED_MODIFY_DATA_POINTER:
1222                         print_ptr(msg, 3, "pointer");
1223                         break;
1224                 case EXTENDED_SDTR:
1225                         print_nego(msg, 3, 4, 0);
1226                         break;
1227                 case EXTENDED_WDTR:
1228                         print_nego(msg, 0, 0, 3);
1229                         break;
1230                 case EXTENDED_PPR:
1231                         print_nego(msg, 3, 5, 6);
1232                         break;
1233                 case EXTENDED_MODIFY_BIDI_DATA_PTR:
1234                         print_ptr(msg, 3, "out");
1235                         print_ptr(msg, 7, "in");
1236                         break;
1237                 default:
1238                 for (i = 2; i < len; ++i)
1239                         printk("%02x ", msg[i]);
1240                 }
1241         /* Identify */
1242         } else if (msg[0] & 0x80) {
1243                 printk("Identify disconnect %sallowed %s %d ",
1244                         (msg[0] & 0x40) ? "" : "not ",
1245                         (msg[0] & 0x20) ? "target routine" : "lun",
1246                         msg[0] & 0x7);
1247         /* Normal One byte */
1248         } else if (msg[0] < 0x1f) {
1249                 if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])
1250                         printk("%s ", one_byte_msgs[msg[0]]);
1251                 else
1252                         printk("reserved (%02x) ", msg[0]);
1253         } else if (msg[0] == 0x55) {
1254                 printk("QAS Request ");
1255         /* Two byte */
1256         } else if (msg[0] <= 0x2f) {
1257                 if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))
1258                         printk("%s %02x ", two_byte_msgs[msg[0] - 0x20],
1259                                 msg[1]);
1260                 else
1261                         printk("reserved two byte (%02x %02x) ",
1262                                 msg[0], msg[1]);
1263                 len = 2;
1264         } else
1265                 printk("reserved ");
1266         return len;
1267 }
1268 EXPORT_SYMBOL(spi_print_msg);
1269
1270 #else  /* ifndef CONFIG_SCSI_CONSTANTS */
1271
1272 int spi_print_msg(const unsigned char *msg)
1273 {
1274         int len = 1, i;
1275
1276         if (msg[0] == EXTENDED_MESSAGE) {
1277                 len = 2 + msg[1];
1278                 if (len == 2)
1279                         len += 256;
1280                 for (i = 0; i < len; ++i)
1281                         printk("%02x ", msg[i]);
1282         /* Identify */
1283         } else if (msg[0] & 0x80) {
1284                 printk("%02x ", msg[0]);
1285         /* Normal One byte */
1286         } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {
1287                 printk("%02x ", msg[0]);
1288         /* Two byte */
1289         } else if (msg[0] <= 0x2f) {
1290                 printk("%02x %02x", msg[0], msg[1]);
1291                 len = 2;
1292         } else
1293                 printk("%02x ", msg[0]);
1294         return len;
1295 }
1296 EXPORT_SYMBOL(spi_print_msg);
1297 #endif /* ! CONFIG_SCSI_CONSTANTS */
1298
1299 static int spi_device_match(struct attribute_container *cont,
1300                             struct device *dev)
1301 {
1302         struct scsi_device *sdev;
1303         struct Scsi_Host *shost;
1304         struct spi_internal *i;
1305
1306         if (!scsi_is_sdev_device(dev))
1307                 return 0;
1308
1309         sdev = to_scsi_device(dev);
1310         shost = sdev->host;
1311         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1312             != &spi_host_class.class)
1313                 return 0;
1314         /* Note: this class has no device attributes, so it has
1315          * no per-HBA allocation and thus we don't need to distinguish
1316          * the attribute containers for the device */
1317         i = to_spi_internal(shost->transportt);
1318         if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1319                 return 0;
1320         return 1;
1321 }
1322
1323 static int spi_target_match(struct attribute_container *cont,
1324                             struct device *dev)
1325 {
1326         struct Scsi_Host *shost;
1327         struct scsi_target *starget;
1328         struct spi_internal *i;
1329
1330         if (!scsi_is_target_device(dev))
1331                 return 0;
1332
1333         shost = dev_to_shost(dev->parent);
1334         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1335             != &spi_host_class.class)
1336                 return 0;
1337
1338         i = to_spi_internal(shost->transportt);
1339         starget = to_scsi_target(dev);
1340
1341         if (i->f->deny_binding && i->f->deny_binding(starget))
1342                 return 0;
1343
1344         return &i->t.target_attrs.ac == cont;
1345 }
1346
1347 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1348                                "spi_transport",
1349                                spi_setup_transport_attrs,
1350                                NULL,
1351                                spi_target_configure);
1352
1353 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1354                                     spi_device_match,
1355                                     spi_device_configure);
1356
1357 static struct attribute *host_attributes[] = {
1358         &dev_attr_signalling.attr,
1359         NULL
1360 };
1361
1362 static struct attribute_group host_attribute_group = {
1363         .attrs = host_attributes,
1364 };
1365
1366 static int spi_host_configure(struct transport_container *tc,
1367                               struct device *dev,
1368                               struct device *cdev)
1369 {
1370         struct kobject *kobj = &cdev->kobj;
1371         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1372         struct spi_internal *si = to_spi_internal(shost->transportt);
1373         struct attribute *attr = &dev_attr_signalling.attr;
1374         int rc = 0;
1375
1376         if (si->f->set_signalling)
1377                 rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR);
1378
1379         return rc;
1380 }
1381
1382 /* returns true if we should be showing the variable.  Also
1383  * overloads the return by setting 1<<1 if the attribute should
1384  * be writeable */
1385 #define TARGET_ATTRIBUTE_HELPER(name) \
1386         (si->f->show_##name ? S_IRUGO : 0) | \
1387         (si->f->set_##name ? S_IWUSR : 0)
1388
1389 static mode_t target_attribute_is_visible(struct kobject *kobj,
1390                                           struct attribute *attr, int i)
1391 {
1392         struct device *cdev = container_of(kobj, struct device, kobj);
1393         struct scsi_target *starget = transport_class_to_starget(cdev);
1394         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1395         struct spi_internal *si = to_spi_internal(shost->transportt);
1396
1397         if (attr == &dev_attr_period.attr &&
1398             spi_support_sync(starget))
1399                 return TARGET_ATTRIBUTE_HELPER(period);
1400         else if (attr == &dev_attr_min_period.attr &&
1401                  spi_support_sync(starget))
1402                 return TARGET_ATTRIBUTE_HELPER(period);
1403         else if (attr == &dev_attr_offset.attr &&
1404                  spi_support_sync(starget))
1405                 return TARGET_ATTRIBUTE_HELPER(offset);
1406         else if (attr == &dev_attr_max_offset.attr &&
1407                  spi_support_sync(starget))
1408                 return TARGET_ATTRIBUTE_HELPER(offset);
1409         else if (attr == &dev_attr_width.attr &&
1410                  spi_support_wide(starget))
1411                 return TARGET_ATTRIBUTE_HELPER(width);
1412         else if (attr == &dev_attr_max_width.attr &&
1413                  spi_support_wide(starget))
1414                 return TARGET_ATTRIBUTE_HELPER(width);
1415         else if (attr == &dev_attr_iu.attr &&
1416                  spi_support_ius(starget))
1417                 return TARGET_ATTRIBUTE_HELPER(iu);
1418         else if (attr == &dev_attr_max_iu.attr &&
1419                  spi_support_ius(starget))
1420                 return TARGET_ATTRIBUTE_HELPER(iu);
1421         else if (attr == &dev_attr_dt.attr &&
1422                  spi_support_dt(starget))
1423                 return TARGET_ATTRIBUTE_HELPER(dt);
1424         else if (attr == &dev_attr_qas.attr &&
1425                  spi_support_qas(starget))
1426                 return TARGET_ATTRIBUTE_HELPER(qas);
1427         else if (attr == &dev_attr_max_qas.attr &&
1428                  spi_support_qas(starget))
1429                 return TARGET_ATTRIBUTE_HELPER(qas);
1430         else if (attr == &dev_attr_wr_flow.attr &&
1431                  spi_support_ius(starget))
1432                 return TARGET_ATTRIBUTE_HELPER(wr_flow);
1433         else if (attr == &dev_attr_rd_strm.attr &&
1434                  spi_support_ius(starget))
1435                 return TARGET_ATTRIBUTE_HELPER(rd_strm);
1436         else if (attr == &dev_attr_rti.attr &&
1437                  spi_support_ius(starget))
1438                 return TARGET_ATTRIBUTE_HELPER(rti);
1439         else if (attr == &dev_attr_pcomp_en.attr &&
1440                  spi_support_ius(starget))
1441                 return TARGET_ATTRIBUTE_HELPER(pcomp_en);
1442         else if (attr == &dev_attr_hold_mcs.attr &&
1443                  spi_support_ius(starget))
1444                 return TARGET_ATTRIBUTE_HELPER(hold_mcs);
1445         else if (attr == &dev_attr_revalidate.attr)
1446                 return S_IWUSR;
1447
1448         return 0;
1449 }
1450
1451 static struct attribute *target_attributes[] = {
1452         &dev_attr_period.attr,
1453         &dev_attr_min_period.attr,
1454         &dev_attr_offset.attr,
1455         &dev_attr_max_offset.attr,
1456         &dev_attr_width.attr,
1457         &dev_attr_max_width.attr,
1458         &dev_attr_iu.attr,
1459         &dev_attr_max_iu.attr,
1460         &dev_attr_dt.attr,
1461         &dev_attr_qas.attr,
1462         &dev_attr_max_qas.attr,
1463         &dev_attr_wr_flow.attr,
1464         &dev_attr_rd_strm.attr,
1465         &dev_attr_rti.attr,
1466         &dev_attr_pcomp_en.attr,
1467         &dev_attr_hold_mcs.attr,
1468         &dev_attr_revalidate.attr,
1469         NULL
1470 };
1471
1472 static struct attribute_group target_attribute_group = {
1473         .attrs = target_attributes,
1474         .is_visible = target_attribute_is_visible,
1475 };
1476
1477 static int spi_target_configure(struct transport_container *tc,
1478                                 struct device *dev,
1479                                 struct device *cdev)
1480 {
1481         struct kobject *kobj = &cdev->kobj;
1482
1483         /* force an update based on parameters read from the device */
1484         sysfs_update_group(kobj, &target_attribute_group);
1485
1486         return 0;
1487 }
1488
1489 struct scsi_transport_template *
1490 spi_attach_transport(struct spi_function_template *ft)
1491 {
1492         struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
1493                                          GFP_KERNEL);
1494
1495         if (unlikely(!i))
1496                 return NULL;
1497
1498         i->t.target_attrs.ac.class = &spi_transport_class.class;
1499         i->t.target_attrs.ac.grp = &target_attribute_group;
1500         i->t.target_attrs.ac.match = spi_target_match;
1501         transport_container_register(&i->t.target_attrs);
1502         i->t.target_size = sizeof(struct spi_transport_attrs);
1503         i->t.host_attrs.ac.class = &spi_host_class.class;
1504         i->t.host_attrs.ac.grp = &host_attribute_group;
1505         i->t.host_attrs.ac.match = spi_host_match;
1506         transport_container_register(&i->t.host_attrs);
1507         i->t.host_size = sizeof(struct spi_host_attrs);
1508         i->f = ft;
1509
1510         return &i->t;
1511 }
1512 EXPORT_SYMBOL(spi_attach_transport);
1513
1514 void spi_release_transport(struct scsi_transport_template *t)
1515 {
1516         struct spi_internal *i = to_spi_internal(t);
1517
1518         transport_container_unregister(&i->t.target_attrs);
1519         transport_container_unregister(&i->t.host_attrs);
1520
1521         kfree(i);
1522 }
1523 EXPORT_SYMBOL(spi_release_transport);
1524
1525 static __init int spi_transport_init(void)
1526 {
1527         int error = transport_class_register(&spi_transport_class);
1528         if (error)
1529                 return error;
1530         error = anon_transport_class_register(&spi_device_class);
1531         return transport_class_register(&spi_host_class);
1532 }
1533
1534 static void __exit spi_transport_exit(void)
1535 {
1536         transport_class_unregister(&spi_transport_class);
1537         anon_transport_class_unregister(&spi_device_class);
1538         transport_class_unregister(&spi_host_class);
1539 }
1540
1541 MODULE_AUTHOR("Martin Hicks");
1542 MODULE_DESCRIPTION("SPI Transport Attributes");
1543 MODULE_LICENSE("GPL");
1544
1545 module_init(spi_transport_init);
1546 module_exit(spi_transport_exit);