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 <linux/slab.h>
 
  29#include <scsi/scsi.h>
  30#include "scsi_priv.h"
  31#include <scsi/scsi_device.h>
  32#include <scsi/scsi_host.h>
  33#include <scsi/scsi_cmnd.h>
  34#include <scsi/scsi_eh.h>
 
  35#include <scsi/scsi_transport.h>
  36#include <scsi/scsi_transport_spi.h>
  37
  38#define SPI_NUM_ATTRS 14	/* increase this if you add attributes */
  39#define SPI_OTHER_ATTRS 1	/* Increase this if you add "always
  40				 * on" attributes */
  41#define SPI_HOST_ATTRS	1
  42
  43#define SPI_MAX_ECHO_BUFFER_SIZE	4096
  44
  45#define DV_LOOPS	3
  46#define DV_TIMEOUT	(10*HZ)
  47#define DV_RETRIES	3	/* should only need at most 
  48				 * two cc/ua clears */
  49
  50/* Our blacklist flags */
  51enum {
  52	SPI_BLIST_NOIUS = 0x1,
  53};
  54
  55/* blacklist table, modelled on scsi_devinfo.c */
  56static struct {
  57	char *vendor;
  58	char *model;
  59	unsigned flags;
  60} spi_static_device_list[] __initdata = {
  61	{"HP", "Ultrium 3-SCSI", SPI_BLIST_NOIUS },
  62	{"IBM", "ULTRIUM-TD3", SPI_BLIST_NOIUS },
  63	{NULL, NULL, 0}
  64};
  65
  66/* Private data accessors (keep these out of the header file) */
  67#define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress)
  68#define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex)
  69
  70struct spi_internal {
  71	struct scsi_transport_template t;
  72	struct spi_function_template *f;
  73};
  74
  75#define to_spi_internal(tmpl)	container_of(tmpl, struct spi_internal, t)
  76
  77static const int ppr_to_ps[] = {
  78	/* The PPR values 0-6 are reserved, fill them in when
  79	 * the committee defines them */
  80	-1,			/* 0x00 */
  81	-1,			/* 0x01 */
  82	-1,			/* 0x02 */
  83	-1,			/* 0x03 */
  84	-1,			/* 0x04 */
  85	-1,			/* 0x05 */
  86	-1,			/* 0x06 */
  87	 3125,			/* 0x07 */
  88	 6250,			/* 0x08 */
  89	12500,			/* 0x09 */
  90	25000,			/* 0x0a */
  91	30300,			/* 0x0b */
  92	50000,			/* 0x0c */
  93};
  94/* The PPR values at which you calculate the period in ns by multiplying
  95 * by 4 */
  96#define SPI_STATIC_PPR	0x0c
  97
  98static int sprint_frac(char *dest, int value, int denom)
  99{
 100	int frac = value % denom;
 101	int result = sprintf(dest, "%d", value / denom);
 102
 103	if (frac == 0)
 104		return result;
 105	dest[result++] = '.';
 106
 107	do {
 108		denom /= 10;
 109		sprintf(dest + result, "%d", frac / denom);
 110		result++;
 111		frac %= denom;
 112	} while (frac);
 113
 114	dest[result++] = '\0';
 115	return result;
 116}
 117
 118static int spi_execute(struct scsi_device *sdev, const void *cmd,
 119		       enum dma_data_direction dir,
 120		       void *buffer, unsigned bufflen,
 121		       struct scsi_sense_hdr *sshdr)
 122{
 123	int i, result;
 124	unsigned char sense[SCSI_SENSE_BUFFERSIZE];
 
 
 
 
 125
 126	for(i = 0; i < DV_RETRIES; i++) {
 127		result = scsi_execute(sdev, cmd, dir, buffer, bufflen,
 128				      sense, DV_TIMEOUT, /* retries */ 1,
 129				      REQ_FAILFAST_DEV |
 130				      REQ_FAILFAST_TRANSPORT |
 131				      REQ_FAILFAST_DRIVER,
 132				      NULL);
 133		if (driver_byte(result) & DRIVER_SENSE) {
 134			struct scsi_sense_hdr sshdr_tmp;
 135			if (!sshdr)
 136				sshdr = &sshdr_tmp;
 137
 138			if (scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE,
 139						 sshdr)
 140			    && sshdr->sense_key == UNIT_ATTENTION)
 141				continue;
 142		}
 143		break;
 144	}
 145	return result;
 146}
 147
 148static struct {
 149	enum spi_signal_type	value;
 150	char			*name;
 151} signal_types[] = {
 152	{ SPI_SIGNAL_UNKNOWN, "unknown" },
 153	{ SPI_SIGNAL_SE, "SE" },
 154	{ SPI_SIGNAL_LVD, "LVD" },
 155	{ SPI_SIGNAL_HVD, "HVD" },
 156};
 157
 158static inline const char *spi_signal_to_string(enum spi_signal_type type)
 159{
 160	int i;
 161
 162	for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 163		if (type == signal_types[i].value)
 164			return signal_types[i].name;
 165	}
 166	return NULL;
 167}
 168static inline enum spi_signal_type spi_signal_to_value(const char *name)
 169{
 170	int i, len;
 171
 172	for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 173		len =  strlen(signal_types[i].name);
 174		if (strncmp(name, signal_types[i].name, len) == 0 &&
 175		    (name[len] == '\n' || name[len] == '\0'))
 176			return signal_types[i].value;
 177	}
 178	return SPI_SIGNAL_UNKNOWN;
 179}
 180
 181static int spi_host_setup(struct transport_container *tc, struct device *dev,
 182			  struct device *cdev)
 183{
 184	struct Scsi_Host *shost = dev_to_shost(dev);
 185
 186	spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
 187
 188	return 0;
 189}
 190
 191static int spi_host_configure(struct transport_container *tc,
 192			      struct device *dev,
 193			      struct device *cdev);
 194
 195static DECLARE_TRANSPORT_CLASS(spi_host_class,
 196			       "spi_host",
 197			       spi_host_setup,
 198			       NULL,
 199			       spi_host_configure);
 200
 201static int spi_host_match(struct attribute_container *cont,
 202			  struct device *dev)
 203{
 204	struct Scsi_Host *shost;
 205
 206	if (!scsi_is_host_device(dev))
 207		return 0;
 208
 209	shost = dev_to_shost(dev);
 210	if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 211	    != &spi_host_class.class)
 212		return 0;
 213
 214	return &shost->transportt->host_attrs.ac == cont;
 215}
 216
 217static int spi_target_configure(struct transport_container *tc,
 218				struct device *dev,
 219				struct device *cdev);
 220
 221static int spi_device_configure(struct transport_container *tc,
 222				struct device *dev,
 223				struct device *cdev)
 224{
 225	struct scsi_device *sdev = to_scsi_device(dev);
 226	struct scsi_target *starget = sdev->sdev_target;
 227	unsigned bflags = scsi_get_device_flags_keyed(sdev, &sdev->inquiry[8],
 228						      &sdev->inquiry[16],
 229						      SCSI_DEVINFO_SPI);
 
 
 230
 231	/* Populate the target capability fields with the values
 232	 * gleaned from the device inquiry */
 233
 234	spi_support_sync(starget) = scsi_device_sync(sdev);
 235	spi_support_wide(starget) = scsi_device_wide(sdev);
 236	spi_support_dt(starget) = scsi_device_dt(sdev);
 237	spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
 238	spi_support_ius(starget) = scsi_device_ius(sdev);
 239	if (bflags & SPI_BLIST_NOIUS) {
 240		dev_info(dev, "Information Units disabled by blacklist\n");
 241		spi_support_ius(starget) = 0;
 242	}
 243	spi_support_qas(starget) = scsi_device_qas(sdev);
 244
 245	return 0;
 246}
 247
 248static int spi_setup_transport_attrs(struct transport_container *tc,
 249				     struct device *dev,
 250				     struct device *cdev)
 251{
 252	struct scsi_target *starget = to_scsi_target(dev);
 253
 254	spi_period(starget) = -1;	/* illegal value */
 255	spi_min_period(starget) = 0;
 256	spi_offset(starget) = 0;	/* async */
 257	spi_max_offset(starget) = 255;
 258	spi_width(starget) = 0;	/* narrow */
 259	spi_max_width(starget) = 1;
 260	spi_iu(starget) = 0;	/* no IU */
 261	spi_max_iu(starget) = 1;
 262	spi_dt(starget) = 0;	/* ST */
 263	spi_qas(starget) = 0;
 264	spi_max_qas(starget) = 1;
 265	spi_wr_flow(starget) = 0;
 266	spi_rd_strm(starget) = 0;
 267	spi_rti(starget) = 0;
 268	spi_pcomp_en(starget) = 0;
 269	spi_hold_mcs(starget) = 0;
 270	spi_dv_pending(starget) = 0;
 271	spi_dv_in_progress(starget) = 0;
 272	spi_initial_dv(starget) = 0;
 273	mutex_init(&spi_dv_mutex(starget));
 274
 275	return 0;
 276}
 277
 278#define spi_transport_show_simple(field, format_string)			\
 279									\
 280static ssize_t								\
 281show_spi_transport_##field(struct device *dev, 			\
 282			   struct device_attribute *attr, char *buf)	\
 283{									\
 284	struct scsi_target *starget = transport_class_to_starget(dev);	\
 285	struct spi_transport_attrs *tp;					\
 286									\
 287	tp = (struct spi_transport_attrs *)&starget->starget_data;	\
 288	return snprintf(buf, 20, format_string, tp->field);		\
 289}
 290
 291#define spi_transport_store_simple(field, format_string)		\
 292									\
 293static ssize_t								\
 294store_spi_transport_##field(struct device *dev, 			\
 295			    struct device_attribute *attr, 		\
 296			    const char *buf, size_t count)		\
 297{									\
 298	int val;							\
 299	struct scsi_target *starget = transport_class_to_starget(dev);	\
 300	struct spi_transport_attrs *tp;					\
 301									\
 302	tp = (struct spi_transport_attrs *)&starget->starget_data;	\
 303	val = simple_strtoul(buf, NULL, 0);				\
 304	tp->field = val;						\
 305	return count;							\
 306}
 307
 308#define spi_transport_show_function(field, format_string)		\
 309									\
 310static ssize_t								\
 311show_spi_transport_##field(struct device *dev, 			\
 312			   struct device_attribute *attr, char *buf)	\
 313{									\
 314	struct scsi_target *starget = transport_class_to_starget(dev);	\
 315	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);	\
 316	struct spi_transport_attrs *tp;					\
 317	struct spi_internal *i = to_spi_internal(shost->transportt);	\
 318	tp = (struct spi_transport_attrs *)&starget->starget_data;	\
 319	if (i->f->get_##field)						\
 320		i->f->get_##field(starget);				\
 321	return snprintf(buf, 20, format_string, tp->field);		\
 322}
 323
 324#define spi_transport_store_function(field, format_string)		\
 325static ssize_t								\
 326store_spi_transport_##field(struct device *dev, 			\
 327			    struct device_attribute *attr,		\
 328			    const char *buf, size_t count)		\
 329{									\
 330	int val;							\
 331	struct scsi_target *starget = transport_class_to_starget(dev);	\
 332	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);	\
 333	struct spi_internal *i = to_spi_internal(shost->transportt);	\
 334									\
 335	if (!i->f->set_##field)						\
 336		return -EINVAL;						\
 337	val = simple_strtoul(buf, NULL, 0);				\
 338	i->f->set_##field(starget, val);				\
 339	return count;							\
 340}
 341
 342#define spi_transport_store_max(field, format_string)			\
 343static ssize_t								\
 344store_spi_transport_##field(struct device *dev, 			\
 345			    struct device_attribute *attr,		\
 346			    const char *buf, size_t count)		\
 347{									\
 348	int val;							\
 349	struct scsi_target *starget = transport_class_to_starget(dev);	\
 350	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);	\
 351	struct spi_internal *i = to_spi_internal(shost->transportt);	\
 352	struct spi_transport_attrs *tp					\
 353		= (struct spi_transport_attrs *)&starget->starget_data;	\
 354									\
 355	if (i->f->set_##field)						\
 356		return -EINVAL;						\
 357	val = simple_strtoul(buf, NULL, 0);				\
 358	if (val > tp->max_##field)					\
 359		val = tp->max_##field;					\
 360	i->f->set_##field(starget, val);				\
 361	return count;							\
 362}
 363
 364#define spi_transport_rd_attr(field, format_string)			\
 365	spi_transport_show_function(field, format_string)		\
 366	spi_transport_store_function(field, format_string)		\
 367static DEVICE_ATTR(field, S_IRUGO,				\
 368		   show_spi_transport_##field,			\
 369		   store_spi_transport_##field);
 370
 371#define spi_transport_simple_attr(field, format_string)			\
 372	spi_transport_show_simple(field, format_string)			\
 373	spi_transport_store_simple(field, format_string)		\
 374static DEVICE_ATTR(field, S_IRUGO,				\
 375		   show_spi_transport_##field,			\
 376		   store_spi_transport_##field);
 377
 378#define spi_transport_max_attr(field, format_string)			\
 379	spi_transport_show_function(field, format_string)		\
 380	spi_transport_store_max(field, format_string)			\
 381	spi_transport_simple_attr(max_##field, format_string)		\
 382static DEVICE_ATTR(field, S_IRUGO,				\
 383		   show_spi_transport_##field,			\
 384		   store_spi_transport_##field);
 385
 386/* The Parallel SCSI Tranport Attributes: */
 387spi_transport_max_attr(offset, "%d\n");
 388spi_transport_max_attr(width, "%d\n");
 389spi_transport_max_attr(iu, "%d\n");
 390spi_transport_rd_attr(dt, "%d\n");
 391spi_transport_max_attr(qas, "%d\n");
 392spi_transport_rd_attr(wr_flow, "%d\n");
 393spi_transport_rd_attr(rd_strm, "%d\n");
 394spi_transport_rd_attr(rti, "%d\n");
 395spi_transport_rd_attr(pcomp_en, "%d\n");
 396spi_transport_rd_attr(hold_mcs, "%d\n");
 397
 398/* we only care about the first child device that's a real SCSI device
 399 * so we return 1 to terminate the iteration when we find it */
 400static int child_iter(struct device *dev, void *data)
 401{
 402	if (!scsi_is_sdev_device(dev))
 403		return 0;
 404
 405	spi_dv_device(to_scsi_device(dev));
 406	return 1;
 407}
 408
 409static ssize_t
 410store_spi_revalidate(struct device *dev, struct device_attribute *attr,
 411		     const char *buf, size_t count)
 412{
 413	struct scsi_target *starget = transport_class_to_starget(dev);
 414
 415	device_for_each_child(&starget->dev, NULL, child_iter);
 416	return count;
 417}
 418static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
 419
 420/* Translate the period into ns according to the current spec
 421 * for SDTR/PPR messages */
 422static int period_to_str(char *buf, int period)
 423{
 424	int len, picosec;
 425
 426	if (period < 0 || period > 0xff) {
 427		picosec = -1;
 428	} else if (period <= SPI_STATIC_PPR) {
 429		picosec = ppr_to_ps[period];
 430	} else {
 431		picosec = period * 4000;
 432	}
 433
 434	if (picosec == -1) {
 435		len = sprintf(buf, "reserved");
 436	} else {
 437		len = sprint_frac(buf, picosec, 1000);
 438	}
 439
 440	return len;
 441}
 442
 443static ssize_t
 444show_spi_transport_period_helper(char *buf, int period)
 445{
 446	int len = period_to_str(buf, period);
 447	buf[len++] = '\n';
 448	buf[len] = '\0';
 449	return len;
 450}
 451
 452static ssize_t
 453store_spi_transport_period_helper(struct device *dev, const char *buf,
 454				  size_t count, int *periodp)
 455{
 456	int j, picosec, period = -1;
 457	char *endp;
 458
 459	picosec = simple_strtoul(buf, &endp, 10) * 1000;
 460	if (*endp == '.') {
 461		int mult = 100;
 462		do {
 463			endp++;
 464			if (!isdigit(*endp))
 465				break;
 466			picosec += (*endp - '0') * mult;
 467			mult /= 10;
 468		} while (mult > 0);
 469	}
 470
 471	for (j = 0; j <= SPI_STATIC_PPR; j++) {
 472		if (ppr_to_ps[j] < picosec)
 473			continue;
 474		period = j;
 475		break;
 476	}
 477
 478	if (period == -1)
 479		period = picosec / 4000;
 480
 481	if (period > 0xff)
 482		period = 0xff;
 483
 484	*periodp = period;
 485
 486	return count;
 487}
 488
 489static ssize_t
 490show_spi_transport_period(struct device *dev,
 491			  struct device_attribute *attr, char *buf)
 492{
 493	struct scsi_target *starget = transport_class_to_starget(dev);
 494	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 495	struct spi_internal *i = to_spi_internal(shost->transportt);
 496	struct spi_transport_attrs *tp =
 497		(struct spi_transport_attrs *)&starget->starget_data;
 498
 499	if (i->f->get_period)
 500		i->f->get_period(starget);
 501
 502	return show_spi_transport_period_helper(buf, tp->period);
 503}
 504
 505static ssize_t
 506store_spi_transport_period(struct device *cdev, struct device_attribute *attr,
 507			   const char *buf, size_t count)
 508{
 509	struct scsi_target *starget = transport_class_to_starget(cdev);
 510	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 511	struct spi_internal *i = to_spi_internal(shost->transportt);
 512	struct spi_transport_attrs *tp =
 513		(struct spi_transport_attrs *)&starget->starget_data;
 514	int period, retval;
 515
 516	if (!i->f->set_period)
 517		return -EINVAL;
 518
 519	retval = store_spi_transport_period_helper(cdev, buf, count, &period);
 520
 521	if (period < tp->min_period)
 522		period = tp->min_period;
 523
 524	i->f->set_period(starget, period);
 525
 526	return retval;
 527}
 528
 529static DEVICE_ATTR(period, S_IRUGO,
 530		   show_spi_transport_period,
 531		   store_spi_transport_period);
 532
 533static ssize_t
 534show_spi_transport_min_period(struct device *cdev,
 535			      struct device_attribute *attr, char *buf)
 536{
 537	struct scsi_target *starget = transport_class_to_starget(cdev);
 538	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 539	struct spi_internal *i = to_spi_internal(shost->transportt);
 540	struct spi_transport_attrs *tp =
 541		(struct spi_transport_attrs *)&starget->starget_data;
 542
 543	if (!i->f->set_period)
 544		return -EINVAL;
 545
 546	return show_spi_transport_period_helper(buf, tp->min_period);
 547}
 548
 549static ssize_t
 550store_spi_transport_min_period(struct device *cdev,
 551			       struct device_attribute *attr,
 552			       const char *buf, size_t count)
 553{
 554	struct scsi_target *starget = transport_class_to_starget(cdev);
 555	struct spi_transport_attrs *tp =
 556		(struct spi_transport_attrs *)&starget->starget_data;
 557
 558	return store_spi_transport_period_helper(cdev, buf, count,
 559						 &tp->min_period);
 560}
 561
 562
 563static DEVICE_ATTR(min_period, S_IRUGO,
 564		   show_spi_transport_min_period,
 565		   store_spi_transport_min_period);
 566
 567
 568static ssize_t show_spi_host_signalling(struct device *cdev,
 569					struct device_attribute *attr,
 570					char *buf)
 571{
 572	struct Scsi_Host *shost = transport_class_to_shost(cdev);
 573	struct spi_internal *i = to_spi_internal(shost->transportt);
 574
 575	if (i->f->get_signalling)
 576		i->f->get_signalling(shost);
 577
 578	return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
 579}
 580static ssize_t store_spi_host_signalling(struct device *dev,
 581					 struct device_attribute *attr,
 582					 const char *buf, size_t count)
 583{
 584	struct Scsi_Host *shost = transport_class_to_shost(dev);
 585	struct spi_internal *i = to_spi_internal(shost->transportt);
 586	enum spi_signal_type type = spi_signal_to_value(buf);
 587
 588	if (!i->f->set_signalling)
 589		return -EINVAL;
 590
 591	if (type != SPI_SIGNAL_UNKNOWN)
 592		i->f->set_signalling(shost, type);
 593
 594	return count;
 595}
 596static DEVICE_ATTR(signalling, S_IRUGO,
 597		   show_spi_host_signalling,
 598		   store_spi_host_signalling);
 599
 600static ssize_t show_spi_host_width(struct device *cdev,
 601				      struct device_attribute *attr,
 602				      char *buf)
 603{
 604	struct Scsi_Host *shost = transport_class_to_shost(cdev);
 605
 606	return sprintf(buf, "%s\n", shost->max_id == 16 ? "wide" : "narrow");
 607}
 608static DEVICE_ATTR(host_width, S_IRUGO,
 609		   show_spi_host_width, NULL);
 610
 611static ssize_t show_spi_host_hba_id(struct device *cdev,
 612				    struct device_attribute *attr,
 613				    char *buf)
 614{
 615	struct Scsi_Host *shost = transport_class_to_shost(cdev);
 616
 617	return sprintf(buf, "%d\n", shost->this_id);
 618}
 619static DEVICE_ATTR(hba_id, S_IRUGO,
 620		   show_spi_host_hba_id, NULL);
 621
 622#define DV_SET(x, y)			\
 623	if(i->f->set_##x)		\
 624		i->f->set_##x(sdev->sdev_target, y)
 625
 626enum spi_compare_returns {
 627	SPI_COMPARE_SUCCESS,
 628	SPI_COMPARE_FAILURE,
 629	SPI_COMPARE_SKIP_TEST,
 630};
 631
 632
 633/* This is for read/write Domain Validation:  If the device supports
 634 * an echo buffer, we do read/write tests to it */
 635static enum spi_compare_returns
 636spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,
 637			  u8 *ptr, const int retries)
 638{
 639	int len = ptr - buffer;
 640	int j, k, r, result;
 641	unsigned int pattern = 0x0000ffff;
 642	struct scsi_sense_hdr sshdr;
 643
 644	const char spi_write_buffer[] = {
 645		WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 646	};
 647	const char spi_read_buffer[] = {
 648		READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 649	};
 650
 651	/* set up the pattern buffer.  Doesn't matter if we spill
 652	 * slightly beyond since that's where the read buffer is */
 653	for (j = 0; j < len; ) {
 654
 655		/* fill the buffer with counting (test a) */
 656		for ( ; j < min(len, 32); j++)
 657			buffer[j] = j;
 658		k = j;
 659		/* fill the buffer with alternating words of 0x0 and
 660		 * 0xffff (test b) */
 661		for ( ; j < min(len, k + 32); j += 2) {
 662			u16 *word = (u16 *)&buffer[j];
 663			
 664			*word = (j & 0x02) ? 0x0000 : 0xffff;
 665		}
 666		k = j;
 667		/* fill with crosstalk (alternating 0x5555 0xaaa)
 668                 * (test c) */
 669		for ( ; j < min(len, k + 32); j += 2) {
 670			u16 *word = (u16 *)&buffer[j];
 671
 672			*word = (j & 0x02) ? 0x5555 : 0xaaaa;
 673		}
 674		k = j;
 675		/* fill with shifting bits (test d) */
 676		for ( ; j < min(len, k + 32); j += 4) {
 677			u32 *word = (unsigned int *)&buffer[j];
 678			u32 roll = (pattern & 0x80000000) ? 1 : 0;
 679			
 680			*word = pattern;
 681			pattern = (pattern << 1) | roll;
 682		}
 683		/* don't bother with random data (test e) */
 684	}
 685
 686	for (r = 0; r < retries; r++) {
 687		result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE,
 688				     buffer, len, &sshdr);
 689		if(result || !scsi_device_online(sdev)) {
 690
 691			scsi_device_set_state(sdev, SDEV_QUIESCE);
 692			if (scsi_sense_valid(&sshdr)
 693			    && sshdr.sense_key == ILLEGAL_REQUEST
 694			    /* INVALID FIELD IN CDB */
 695			    && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
 696				/* This would mean that the drive lied
 697				 * to us about supporting an echo
 698				 * buffer (unfortunately some Western
 699				 * Digital drives do precisely this)
 700				 */
 701				return SPI_COMPARE_SKIP_TEST;
 702
 703
 704			sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
 705			return SPI_COMPARE_FAILURE;
 706		}
 707
 708		memset(ptr, 0, len);
 709		spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE,
 710			    ptr, len, NULL);
 711		scsi_device_set_state(sdev, SDEV_QUIESCE);
 712
 713		if (memcmp(buffer, ptr, len) != 0)
 714			return SPI_COMPARE_FAILURE;
 715	}
 716	return SPI_COMPARE_SUCCESS;
 717}
 718
 719/* This is for the simplest form of Domain Validation: a read test
 720 * on the inquiry data from the device */
 721static enum spi_compare_returns
 722spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,
 723			      u8 *ptr, const int retries)
 724{
 725	int r, result;
 726	const int len = sdev->inquiry_len;
 727	const char spi_inquiry[] = {
 728		INQUIRY, 0, 0, 0, len, 0
 729	};
 730
 731	for (r = 0; r < retries; r++) {
 732		memset(ptr, 0, len);
 733
 734		result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE,
 735				     ptr, len, NULL);
 736		
 737		if(result || !scsi_device_online(sdev)) {
 738			scsi_device_set_state(sdev, SDEV_QUIESCE);
 739			return SPI_COMPARE_FAILURE;
 740		}
 741
 742		/* If we don't have the inquiry data already, the
 743		 * first read gets it */
 744		if (ptr == buffer) {
 745			ptr += len;
 746			--r;
 747			continue;
 748		}
 749
 750		if (memcmp(buffer, ptr, len) != 0)
 751			/* failure */
 752			return SPI_COMPARE_FAILURE;
 753	}
 754	return SPI_COMPARE_SUCCESS;
 755}
 756
 757static enum spi_compare_returns
 758spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,
 759	       enum spi_compare_returns 
 760	       (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
 761{
 762	struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 763	struct scsi_target *starget = sdev->sdev_target;
 764	int period = 0, prevperiod = 0; 
 765	enum spi_compare_returns retval;
 766
 767
 768	for (;;) {
 769		int newperiod;
 770		retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
 771
 772		if (retval == SPI_COMPARE_SUCCESS
 773		    || retval == SPI_COMPARE_SKIP_TEST)
 774			break;
 775
 776		/* OK, retrain, fallback */
 777		if (i->f->get_iu)
 778			i->f->get_iu(starget);
 779		if (i->f->get_qas)
 780			i->f->get_qas(starget);
 781		if (i->f->get_period)
 782			i->f->get_period(sdev->sdev_target);
 783
 784		/* Here's the fallback sequence; first try turning off
 785		 * IU, then QAS (if we can control them), then finally
 786		 * fall down the periods */
 787		if (i->f->set_iu && spi_iu(starget)) {
 788			starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n");
 789			DV_SET(iu, 0);
 790		} else if (i->f->set_qas && spi_qas(starget)) {
 791			starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n");
 792			DV_SET(qas, 0);
 793		} else {
 794			newperiod = spi_period(starget);
 795			period = newperiod > period ? newperiod : period;
 796			if (period < 0x0d)
 797				period++;
 798			else
 799				period += period >> 1;
 800
 801			if (unlikely(period > 0xff || period == prevperiod)) {
 802				/* Total failure; set to async and return */
 803				starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
 804				DV_SET(offset, 0);
 805				return SPI_COMPARE_FAILURE;
 806			}
 807			starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");
 808			DV_SET(period, period);
 809			prevperiod = period;
 810		}
 811	}
 812	return retval;
 813}
 814
 815static int
 816spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)
 817{
 818	int l, result;
 819
 820	/* first off do a test unit ready.  This can error out 
 821	 * because of reservations or some other reason.  If it
 822	 * fails, the device won't let us write to the echo buffer
 823	 * so just return failure */
 824	
 825	const char spi_test_unit_ready[] = {
 826		TEST_UNIT_READY, 0, 0, 0, 0, 0
 827	};
 828
 829	const char spi_read_buffer_descriptor[] = {
 830		READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
 831	};
 832
 833	
 834	/* We send a set of three TURs to clear any outstanding 
 835	 * unit attention conditions if they exist (Otherwise the
 836	 * buffer tests won't be happy).  If the TUR still fails
 837	 * (reservation conflict, device not ready, etc) just
 838	 * skip the write tests */
 839	for (l = 0; ; l++) {
 840		result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE, 
 841				     NULL, 0, NULL);
 842
 843		if(result) {
 844			if(l >= 3)
 845				return 0;
 846		} else {
 847			/* TUR succeeded */
 848			break;
 849		}
 850	}
 851
 852	result = spi_execute(sdev, spi_read_buffer_descriptor, 
 853			     DMA_FROM_DEVICE, buffer, 4, NULL);
 854
 855	if (result)
 856		/* Device has no echo buffer */
 857		return 0;
 858
 859	return buffer[3] + ((buffer[2] & 0x1f) << 8);
 860}
 861
 862static void
 863spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
 864{
 865	struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 866	struct scsi_target *starget = sdev->sdev_target;
 867	struct Scsi_Host *shost = sdev->host;
 868	int len = sdev->inquiry_len;
 869	int min_period = spi_min_period(starget);
 870	int max_width = spi_max_width(starget);
 871	/* first set us up for narrow async */
 872	DV_SET(offset, 0);
 873	DV_SET(width, 0);
 874
 875	if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
 876	    != SPI_COMPARE_SUCCESS) {
 877		starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
 878		/* FIXME: should probably offline the device here? */
 879		return;
 880	}
 881
 882	if (!spi_support_wide(starget)) {
 883		spi_max_width(starget) = 0;
 884		max_width = 0;
 885	}
 886
 887	/* test width */
 888	if (i->f->set_width && max_width) {
 889		i->f->set_width(starget, 1);
 890
 891		if (spi_dv_device_compare_inquiry(sdev, buffer,
 892						   buffer + len,
 893						   DV_LOOPS)
 894		    != SPI_COMPARE_SUCCESS) {
 895			starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
 896			i->f->set_width(starget, 0);
 897			/* Make sure we don't force wide back on by asking
 898			 * for a transfer period that requires it */
 899			max_width = 0;
 900			if (min_period < 10)
 901				min_period = 10;
 902		}
 903	}
 904
 905	if (!i->f->set_period)
 906		return;
 907
 908	/* device can't handle synchronous */
 909	if (!spi_support_sync(starget) && !spi_support_dt(starget))
 910		return;
 911
 912	/* len == -1 is the signal that we need to ascertain the
 913	 * presence of an echo buffer before trying to use it.  len ==
 914	 * 0 means we don't have an echo buffer */
 915	len = -1;
 916
 917 retry:
 918
 919	/* now set up to the maximum */
 920	DV_SET(offset, spi_max_offset(starget));
 921	DV_SET(period, min_period);
 922
 923	/* try QAS requests; this should be harmless to set if the
 924	 * target supports it */
 925	if (spi_support_qas(starget) && spi_max_qas(starget)) {
 926		DV_SET(qas, 1);
 927	} else {
 928		DV_SET(qas, 0);
 929	}
 930
 931	if (spi_support_ius(starget) && spi_max_iu(starget) &&
 932	    min_period < 9) {
 933		/* This u320 (or u640). Set IU transfers */
 934		DV_SET(iu, 1);
 935		/* Then set the optional parameters */
 936		DV_SET(rd_strm, 1);
 937		DV_SET(wr_flow, 1);
 938		DV_SET(rti, 1);
 939		if (min_period == 8)
 940			DV_SET(pcomp_en, 1);
 941	} else {
 942		DV_SET(iu, 0);
 943	}
 944
 945	/* now that we've done all this, actually check the bus
 946	 * signal type (if known).  Some devices are stupid on
 947	 * a SE bus and still claim they can try LVD only settings */
 948	if (i->f->get_signalling)
 949		i->f->get_signalling(shost);
 950	if (spi_signalling(shost) == SPI_SIGNAL_SE ||
 951	    spi_signalling(shost) == SPI_SIGNAL_HVD ||
 952	    !spi_support_dt(starget)) {
 953		DV_SET(dt, 0);
 954	} else {
 955		DV_SET(dt, 1);
 956	}
 957	/* set width last because it will pull all the other
 958	 * parameters down to required values */
 959	DV_SET(width, max_width);
 960
 961	/* Do the read only INQUIRY tests */
 962	spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
 963		       spi_dv_device_compare_inquiry);
 964	/* See if we actually managed to negotiate and sustain DT */
 965	if (i->f->get_dt)
 966		i->f->get_dt(starget);
 967
 968	/* see if the device has an echo buffer.  If it does we can do
 969	 * the SPI pattern write tests.  Because of some broken
 970	 * devices, we *only* try this on a device that has actually
 971	 * negotiated DT */
 972
 973	if (len == -1 && spi_dt(starget))
 974		len = spi_dv_device_get_echo_buffer(sdev, buffer);
 975
 976	if (len <= 0) {
 977		starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
 978		return;
 979	}
 980
 981	if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
 982		starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
 983		len = SPI_MAX_ECHO_BUFFER_SIZE;
 984	}
 985
 986	if (spi_dv_retrain(sdev, buffer, buffer + len,
 987			   spi_dv_device_echo_buffer)
 988	    == SPI_COMPARE_SKIP_TEST) {
 989		/* OK, the stupid drive can't do a write echo buffer
 990		 * test after all, fall back to the read tests */
 991		len = 0;
 992		goto retry;
 993	}
 994}
 995
 996
 997/**	spi_dv_device - Do Domain Validation on the device
 998 *	@sdev:		scsi device to validate
 999 *
1000 *	Performs the domain validation on the given device in the
1001 *	current execution thread.  Since DV operations may sleep,
1002 *	the current thread must have user context.  Also no SCSI
1003 *	related locks that would deadlock I/O issued by the DV may
1004 *	be held.
1005 */
1006void
1007spi_dv_device(struct scsi_device *sdev)
1008{
1009	struct scsi_target *starget = sdev->sdev_target;
1010	u8 *buffer;
1011	const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
1012
1013	if (unlikely(scsi_device_get(sdev)))
1014		return;
 
 
 
 
 
1015
1016	if (unlikely(spi_dv_in_progress(starget)))
1017		return;
 
 
 
 
1018	spi_dv_in_progress(starget) = 1;
1019
1020	buffer = kzalloc(len, GFP_KERNEL);
1021
1022	if (unlikely(!buffer))
1023		goto out_put;
1024
1025	/* We need to verify that the actual device will quiesce; the
1026	 * later target quiesce is just a nice to have */
1027	if (unlikely(scsi_device_quiesce(sdev)))
1028		goto out_free;
1029
1030	scsi_target_quiesce(starget);
1031
1032	spi_dv_pending(starget) = 1;
1033	mutex_lock(&spi_dv_mutex(starget));
1034
1035	starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
1036
1037	spi_dv_device_internal(sdev, buffer);
1038
1039	starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
1040
1041	mutex_unlock(&spi_dv_mutex(starget));
1042	spi_dv_pending(starget) = 0;
1043
1044	scsi_target_resume(starget);
1045
1046	spi_initial_dv(starget) = 1;
1047
1048 out_free:
1049	kfree(buffer);
1050 out_put:
1051	spi_dv_in_progress(starget) = 0;
1052	scsi_device_put(sdev);
 
 
1053}
1054EXPORT_SYMBOL(spi_dv_device);
1055
1056struct work_queue_wrapper {
1057	struct work_struct	work;
1058	struct scsi_device	*sdev;
1059};
1060
1061static void
1062spi_dv_device_work_wrapper(struct work_struct *work)
1063{
1064	struct work_queue_wrapper *wqw =
1065		container_of(work, struct work_queue_wrapper, work);
1066	struct scsi_device *sdev = wqw->sdev;
1067
1068	kfree(wqw);
1069	spi_dv_device(sdev);
1070	spi_dv_pending(sdev->sdev_target) = 0;
1071	scsi_device_put(sdev);
1072}
1073
1074
1075/**
1076 *	spi_schedule_dv_device - schedule domain validation to occur on the device
1077 *	@sdev:	The device to validate
1078 *
1079 *	Identical to spi_dv_device() above, except that the DV will be
1080 *	scheduled to occur in a workqueue later.  All memory allocations
1081 *	are atomic, so may be called from any context including those holding
1082 *	SCSI locks.
1083 */
1084void
1085spi_schedule_dv_device(struct scsi_device *sdev)
1086{
1087	struct work_queue_wrapper *wqw =
1088		kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
1089
1090	if (unlikely(!wqw))
1091		return;
1092
1093	if (unlikely(spi_dv_pending(sdev->sdev_target))) {
1094		kfree(wqw);
1095		return;
1096	}
1097	/* Set pending early (dv_device doesn't check it, only sets it) */
1098	spi_dv_pending(sdev->sdev_target) = 1;
1099	if (unlikely(scsi_device_get(sdev))) {
1100		kfree(wqw);
1101		spi_dv_pending(sdev->sdev_target) = 0;
1102		return;
1103	}
1104
1105	INIT_WORK(&wqw->work, spi_dv_device_work_wrapper);
1106	wqw->sdev = sdev;
1107
1108	schedule_work(&wqw->work);
1109}
1110EXPORT_SYMBOL(spi_schedule_dv_device);
1111
1112/**
1113 * spi_display_xfer_agreement - Print the current target transfer agreement
1114 * @starget: The target for which to display the agreement
1115 *
1116 * Each SPI port is required to maintain a transfer agreement for each
1117 * other port on the bus.  This function prints a one-line summary of
1118 * the current agreement; more detailed information is available in sysfs.
1119 */
1120void spi_display_xfer_agreement(struct scsi_target *starget)
1121{
1122	struct spi_transport_attrs *tp;
1123	tp = (struct spi_transport_attrs *)&starget->starget_data;
1124
1125	if (tp->offset > 0 && tp->period > 0) {
1126		unsigned int picosec, kb100;
1127		char *scsi = "FAST-?";
1128		char tmp[8];
1129
1130		if (tp->period <= SPI_STATIC_PPR) {
1131			picosec = ppr_to_ps[tp->period];
1132			switch (tp->period) {
1133				case  7: scsi = "FAST-320"; break;
1134				case  8: scsi = "FAST-160"; break;
1135				case  9: scsi = "FAST-80"; break;
1136				case 10:
1137				case 11: scsi = "FAST-40"; break;
1138				case 12: scsi = "FAST-20"; break;
1139			}
1140		} else {
1141			picosec = tp->period * 4000;
1142			if (tp->period < 25)
1143				scsi = "FAST-20";
1144			else if (tp->period < 50)
1145				scsi = "FAST-10";
1146			else
1147				scsi = "FAST-5";
1148		}
1149
1150		kb100 = (10000000 + picosec / 2) / picosec;
1151		if (tp->width)
1152			kb100 *= 2;
1153		sprint_frac(tmp, picosec, 1000);
1154
1155		dev_info(&starget->dev,
1156			 "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1157			 scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1158			 tp->dt ? "DT" : "ST",
1159			 tp->iu ? " IU" : "",
1160			 tp->qas  ? " QAS" : "",
1161			 tp->rd_strm ? " RDSTRM" : "",
1162			 tp->rti ? " RTI" : "",
1163			 tp->wr_flow ? " WRFLOW" : "",
1164			 tp->pcomp_en ? " PCOMP" : "",
1165			 tp->hold_mcs ? " HMCS" : "",
1166			 tmp, tp->offset);
1167	} else {
1168		dev_info(&starget->dev, "%sasynchronous\n",
1169				tp->width ? "wide " : "");
1170	}
1171}
1172EXPORT_SYMBOL(spi_display_xfer_agreement);
1173
1174int spi_populate_width_msg(unsigned char *msg, int width)
1175{
1176	msg[0] = EXTENDED_MESSAGE;
1177	msg[1] = 2;
1178	msg[2] = EXTENDED_WDTR;
1179	msg[3] = width;
1180	return 4;
1181}
1182EXPORT_SYMBOL_GPL(spi_populate_width_msg);
1183
1184int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
1185{
1186	msg[0] = EXTENDED_MESSAGE;
1187	msg[1] = 3;
1188	msg[2] = EXTENDED_SDTR;
1189	msg[3] = period;
1190	msg[4] = offset;
1191	return 5;
1192}
1193EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
1194
1195int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
1196		int width, int options)
1197{
1198	msg[0] = EXTENDED_MESSAGE;
1199	msg[1] = 6;
1200	msg[2] = EXTENDED_PPR;
1201	msg[3] = period;
1202	msg[4] = 0;
1203	msg[5] = offset;
1204	msg[6] = width;
1205	msg[7] = options;
1206	return 8;
1207}
1208EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
1209
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1210#ifdef CONFIG_SCSI_CONSTANTS
1211static const char * const one_byte_msgs[] = {
1212/* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",
1213/* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error", 
1214/* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",
1215/* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1216/* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set", 
1217/* 0x0f */ "Initiate Recovery", "Release Recovery",
1218/* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",
1219/* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"
1220};
1221
1222static const char * const two_byte_msgs[] = {
1223/* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
1224/* 0x23 */ "Ignore Wide Residue", "ACA"
1225};
1226
1227static const char * const extended_msgs[] = {
1228/* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1229/* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",
1230/* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"
1231};
1232
1233static void print_nego(const unsigned char *msg, int per, int off, int width)
1234{
1235	if (per) {
1236		char buf[20];
1237		period_to_str(buf, msg[per]);
1238		printk("period = %s ns ", buf);
1239	}
1240
1241	if (off)
1242		printk("offset = %d ", msg[off]);
1243	if (width)
1244		printk("width = %d ", 8 << msg[width]);
1245}
1246
1247static void print_ptr(const unsigned char *msg, int msb, const char *desc)
1248{
1249	int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |
1250			msg[msb+3];
1251	printk("%s = %d ", desc, ptr);
1252}
1253
1254int spi_print_msg(const unsigned char *msg)
1255{
1256	int len = 1, i;
1257	if (msg[0] == EXTENDED_MESSAGE) {
1258		len = 2 + msg[1];
1259		if (len == 2)
1260			len += 256;
1261		if (msg[2] < ARRAY_SIZE(extended_msgs))
1262			printk ("%s ", extended_msgs[msg[2]]); 
1263		else 
1264			printk ("Extended Message, reserved code (0x%02x) ",
1265				(int) msg[2]);
1266		switch (msg[2]) {
1267		case EXTENDED_MODIFY_DATA_POINTER:
1268			print_ptr(msg, 3, "pointer");
1269			break;
1270		case EXTENDED_SDTR:
1271			print_nego(msg, 3, 4, 0);
1272			break;
1273		case EXTENDED_WDTR:
1274			print_nego(msg, 0, 0, 3);
1275			break;
1276		case EXTENDED_PPR:
1277			print_nego(msg, 3, 5, 6);
1278			break;
1279		case EXTENDED_MODIFY_BIDI_DATA_PTR:
1280			print_ptr(msg, 3, "out");
1281			print_ptr(msg, 7, "in");
1282			break;
1283		default:
1284		for (i = 2; i < len; ++i) 
1285			printk("%02x ", msg[i]);
1286		}
1287	/* Identify */
1288	} else if (msg[0] & 0x80) {
1289		printk("Identify disconnect %sallowed %s %d ",
1290			(msg[0] & 0x40) ? "" : "not ",
1291			(msg[0] & 0x20) ? "target routine" : "lun",
1292			msg[0] & 0x7);
1293	/* Normal One byte */
1294	} else if (msg[0] < 0x1f) {
1295		if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])
1296			printk("%s ", one_byte_msgs[msg[0]]);
1297		else
1298			printk("reserved (%02x) ", msg[0]);
1299	} else if (msg[0] == 0x55) {
1300		printk("QAS Request ");
1301	/* Two byte */
1302	} else if (msg[0] <= 0x2f) {
1303		if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))
1304			printk("%s %02x ", two_byte_msgs[msg[0] - 0x20], 
1305				msg[1]);
1306		else 
1307			printk("reserved two byte (%02x %02x) ", 
1308				msg[0], msg[1]);
1309		len = 2;
1310	} else 
1311		printk("reserved ");
1312	return len;
1313}
1314EXPORT_SYMBOL(spi_print_msg);
1315
1316#else  /* ifndef CONFIG_SCSI_CONSTANTS */
1317
1318int spi_print_msg(const unsigned char *msg)
1319{
1320	int len = 1, i;
1321
1322	if (msg[0] == EXTENDED_MESSAGE) {
1323		len = 2 + msg[1];
1324		if (len == 2)
1325			len += 256;
1326		for (i = 0; i < len; ++i)
1327			printk("%02x ", msg[i]);
1328	/* Identify */
1329	} else if (msg[0] & 0x80) {
1330		printk("%02x ", msg[0]);
1331	/* Normal One byte */
1332	} else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {
1333		printk("%02x ", msg[0]);
1334	/* Two byte */
1335	} else if (msg[0] <= 0x2f) {
1336		printk("%02x %02x", msg[0], msg[1]);
1337		len = 2;
1338	} else 
1339		printk("%02x ", msg[0]);
1340	return len;
1341}
1342EXPORT_SYMBOL(spi_print_msg);
1343#endif /* ! CONFIG_SCSI_CONSTANTS */
1344
1345static int spi_device_match(struct attribute_container *cont,
1346			    struct device *dev)
1347{
1348	struct scsi_device *sdev;
1349	struct Scsi_Host *shost;
1350	struct spi_internal *i;
1351
1352	if (!scsi_is_sdev_device(dev))
1353		return 0;
1354
1355	sdev = to_scsi_device(dev);
1356	shost = sdev->host;
1357	if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1358	    != &spi_host_class.class)
1359		return 0;
1360	/* Note: this class has no device attributes, so it has
1361	 * no per-HBA allocation and thus we don't need to distinguish
1362	 * the attribute containers for the device */
1363	i = to_spi_internal(shost->transportt);
1364	if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1365		return 0;
1366	return 1;
1367}
1368
1369static int spi_target_match(struct attribute_container *cont,
1370			    struct device *dev)
1371{
1372	struct Scsi_Host *shost;
1373	struct scsi_target *starget;
1374	struct spi_internal *i;
1375
1376	if (!scsi_is_target_device(dev))
1377		return 0;
1378
1379	shost = dev_to_shost(dev->parent);
1380	if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1381	    != &spi_host_class.class)
1382		return 0;
1383
1384	i = to_spi_internal(shost->transportt);
1385	starget = to_scsi_target(dev);
1386
1387	if (i->f->deny_binding && i->f->deny_binding(starget))
1388		return 0;
1389
1390	return &i->t.target_attrs.ac == cont;
1391}
1392
1393static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1394			       "spi_transport",
1395			       spi_setup_transport_attrs,
1396			       NULL,
1397			       spi_target_configure);
1398
1399static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1400				    spi_device_match,
1401				    spi_device_configure);
1402
1403static struct attribute *host_attributes[] = {
1404	&dev_attr_signalling.attr,
1405	&dev_attr_host_width.attr,
1406	&dev_attr_hba_id.attr,
1407	NULL
1408};
1409
1410static struct attribute_group host_attribute_group = {
1411	.attrs = host_attributes,
1412};
1413
1414static int spi_host_configure(struct transport_container *tc,
1415			      struct device *dev,
1416			      struct device *cdev)
1417{
1418	struct kobject *kobj = &cdev->kobj;
1419	struct Scsi_Host *shost = transport_class_to_shost(cdev);
1420	struct spi_internal *si = to_spi_internal(shost->transportt);
1421	struct attribute *attr = &dev_attr_signalling.attr;
1422	int rc = 0;
1423
1424	if (si->f->set_signalling)
1425		rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR);
1426
1427	return rc;
1428}
1429
1430/* returns true if we should be showing the variable.  Also
1431 * overloads the return by setting 1<<1 if the attribute should
1432 * be writeable */
1433#define TARGET_ATTRIBUTE_HELPER(name) \
1434	(si->f->show_##name ? S_IRUGO : 0) | \
1435	(si->f->set_##name ? S_IWUSR : 0)
1436
1437static mode_t target_attribute_is_visible(struct kobject *kobj,
1438					  struct attribute *attr, int i)
1439{
1440	struct device *cdev = container_of(kobj, struct device, kobj);
1441	struct scsi_target *starget = transport_class_to_starget(cdev);
1442	struct Scsi_Host *shost = transport_class_to_shost(cdev);
1443	struct spi_internal *si = to_spi_internal(shost->transportt);
1444
1445	if (attr == &dev_attr_period.attr &&
1446	    spi_support_sync(starget))
1447		return TARGET_ATTRIBUTE_HELPER(period);
1448	else if (attr == &dev_attr_min_period.attr &&
1449		 spi_support_sync(starget))
1450		return TARGET_ATTRIBUTE_HELPER(period);
1451	else if (attr == &dev_attr_offset.attr &&
1452		 spi_support_sync(starget))
1453		return TARGET_ATTRIBUTE_HELPER(offset);
1454	else if (attr == &dev_attr_max_offset.attr &&
1455		 spi_support_sync(starget))
1456		return TARGET_ATTRIBUTE_HELPER(offset);
1457	else if (attr == &dev_attr_width.attr &&
1458		 spi_support_wide(starget))
1459		return TARGET_ATTRIBUTE_HELPER(width);
1460	else if (attr == &dev_attr_max_width.attr &&
1461		 spi_support_wide(starget))
1462		return TARGET_ATTRIBUTE_HELPER(width);
1463	else if (attr == &dev_attr_iu.attr &&
1464		 spi_support_ius(starget))
1465		return TARGET_ATTRIBUTE_HELPER(iu);
1466	else if (attr == &dev_attr_max_iu.attr &&
1467		 spi_support_ius(starget))
1468		return TARGET_ATTRIBUTE_HELPER(iu);
1469	else if (attr == &dev_attr_dt.attr &&
1470		 spi_support_dt(starget))
1471		return TARGET_ATTRIBUTE_HELPER(dt);
1472	else if (attr == &dev_attr_qas.attr &&
1473		 spi_support_qas(starget))
1474		return TARGET_ATTRIBUTE_HELPER(qas);
1475	else if (attr == &dev_attr_max_qas.attr &&
1476		 spi_support_qas(starget))
1477		return TARGET_ATTRIBUTE_HELPER(qas);
1478	else if (attr == &dev_attr_wr_flow.attr &&
1479		 spi_support_ius(starget))
1480		return TARGET_ATTRIBUTE_HELPER(wr_flow);
1481	else if (attr == &dev_attr_rd_strm.attr &&
1482		 spi_support_ius(starget))
1483		return TARGET_ATTRIBUTE_HELPER(rd_strm);
1484	else if (attr == &dev_attr_rti.attr &&
1485		 spi_support_ius(starget))
1486		return TARGET_ATTRIBUTE_HELPER(rti);
1487	else if (attr == &dev_attr_pcomp_en.attr &&
1488		 spi_support_ius(starget))
1489		return TARGET_ATTRIBUTE_HELPER(pcomp_en);
1490	else if (attr == &dev_attr_hold_mcs.attr &&
1491		 spi_support_ius(starget))
1492		return TARGET_ATTRIBUTE_HELPER(hold_mcs);
1493	else if (attr == &dev_attr_revalidate.attr)
1494		return S_IWUSR;
1495
1496	return 0;
1497}
1498
1499static struct attribute *target_attributes[] = {
1500	&dev_attr_period.attr,
1501	&dev_attr_min_period.attr,
1502	&dev_attr_offset.attr,
1503	&dev_attr_max_offset.attr,
1504	&dev_attr_width.attr,
1505	&dev_attr_max_width.attr,
1506	&dev_attr_iu.attr,
1507	&dev_attr_max_iu.attr,
1508	&dev_attr_dt.attr,
1509	&dev_attr_qas.attr,
1510	&dev_attr_max_qas.attr,
1511	&dev_attr_wr_flow.attr,
1512	&dev_attr_rd_strm.attr,
1513	&dev_attr_rti.attr,
1514	&dev_attr_pcomp_en.attr,
1515	&dev_attr_hold_mcs.attr,
1516	&dev_attr_revalidate.attr,
1517	NULL
1518};
1519
1520static struct attribute_group target_attribute_group = {
1521	.attrs = target_attributes,
1522	.is_visible = target_attribute_is_visible,
1523};
1524
1525static int spi_target_configure(struct transport_container *tc,
1526				struct device *dev,
1527				struct device *cdev)
1528{
1529	struct kobject *kobj = &cdev->kobj;
1530
1531	/* force an update based on parameters read from the device */
1532	sysfs_update_group(kobj, &target_attribute_group);
1533
1534	return 0;
1535}
1536
1537struct scsi_transport_template *
1538spi_attach_transport(struct spi_function_template *ft)
1539{
1540	struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
1541					 GFP_KERNEL);
1542
1543	if (unlikely(!i))
1544		return NULL;
1545
1546	i->t.target_attrs.ac.class = &spi_transport_class.class;
1547	i->t.target_attrs.ac.grp = &target_attribute_group;
1548	i->t.target_attrs.ac.match = spi_target_match;
1549	transport_container_register(&i->t.target_attrs);
1550	i->t.target_size = sizeof(struct spi_transport_attrs);
1551	i->t.host_attrs.ac.class = &spi_host_class.class;
1552	i->t.host_attrs.ac.grp = &host_attribute_group;
1553	i->t.host_attrs.ac.match = spi_host_match;
1554	transport_container_register(&i->t.host_attrs);
1555	i->t.host_size = sizeof(struct spi_host_attrs);
1556	i->f = ft;
1557
1558	return &i->t;
1559}
1560EXPORT_SYMBOL(spi_attach_transport);
1561
1562void spi_release_transport(struct scsi_transport_template *t)
1563{
1564	struct spi_internal *i = to_spi_internal(t);
1565
1566	transport_container_unregister(&i->t.target_attrs);
1567	transport_container_unregister(&i->t.host_attrs);
1568
1569	kfree(i);
1570}
1571EXPORT_SYMBOL(spi_release_transport);
1572
1573static __init int spi_transport_init(void)
1574{
1575	int error = scsi_dev_info_add_list(SCSI_DEVINFO_SPI,
1576					   "SCSI Parallel Transport Class");
1577	if (!error) {
1578		int i;
1579
1580		for (i = 0; spi_static_device_list[i].vendor; i++)
1581			scsi_dev_info_list_add_keyed(1,	/* compatible */
1582						     spi_static_device_list[i].vendor,
1583						     spi_static_device_list[i].model,
1584						     NULL,
1585						     spi_static_device_list[i].flags,
1586						     SCSI_DEVINFO_SPI);
1587	}
1588
1589	error = transport_class_register(&spi_transport_class);
1590	if (error)
1591		return error;
1592	error = anon_transport_class_register(&spi_device_class);
1593	return transport_class_register(&spi_host_class);
1594}
1595
1596static void __exit spi_transport_exit(void)
1597{
1598	transport_class_unregister(&spi_transport_class);
1599	anon_transport_class_unregister(&spi_device_class);
1600	transport_class_unregister(&spi_host_class);
1601	scsi_dev_info_remove_list(SCSI_DEVINFO_SPI);
1602}
1603
1604MODULE_AUTHOR("Martin Hicks");
1605MODULE_DESCRIPTION("SPI Transport Attributes");
1606MODULE_LICENSE("GPL");
1607
1608module_init(spi_transport_init);
1609module_exit(spi_transport_exit);