config: tegra3: enable /dev mount with ACL
[linux-2.6.git] / 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 <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 */
51 enum {
52         SPI_BLIST_NOIUS = 0x1,
53 };
54
55 /* blacklist table, modelled on scsi_devinfo.c */
56 static 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
70 struct 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
77 static 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
98 static 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
118 static 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
148 static 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
158 static 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 }
168 static 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
181 static 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
191 static int spi_host_configure(struct transport_container *tc,
192                               struct device *dev,
193                               struct device *cdev);
194
195 static DECLARE_TRANSPORT_CLASS(spi_host_class,
196                                "spi_host",
197                                spi_host_setup,
198                                NULL,
199                                spi_host_configure);
200
201 static 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
217 static int spi_target_configure(struct transport_container *tc,
218                                 struct device *dev,
219                                 struct device *cdev);
220
221 static 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
248 static 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                                                                         \
280 static ssize_t                                                          \
281 show_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                                                                         \
293 static ssize_t                                                          \
294 store_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                                                                         \
310 static ssize_t                                                          \
311 show_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)              \
325 static ssize_t                                                          \
326 store_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)                   \
343 static ssize_t                                                          \
344 store_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)              \
367 static 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)                \
374 static 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)           \
382 static DEVICE_ATTR(field, S_IRUGO,                              \
383                    show_spi_transport_##field,                  \
384                    store_spi_transport_##field);
385
386 /* The Parallel SCSI Tranport Attributes: */
387 spi_transport_max_attr(offset, "%d\n");
388 spi_transport_max_attr(width, "%d\n");
389 spi_transport_max_attr(iu, "%d\n");
390 spi_transport_rd_attr(dt, "%d\n");
391 spi_transport_max_attr(qas, "%d\n");
392 spi_transport_rd_attr(wr_flow, "%d\n");
393 spi_transport_rd_attr(rd_strm, "%d\n");
394 spi_transport_rd_attr(rti, "%d\n");
395 spi_transport_rd_attr(pcomp_en, "%d\n");
396 spi_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 */
400 static 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
409 static ssize_t
410 store_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 }
418 static 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 */
422 static 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
443 static ssize_t
444 show_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
452 static ssize_t
453 store_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
489 static ssize_t
490 show_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
505 static ssize_t
506 store_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
529 static DEVICE_ATTR(period, S_IRUGO,
530                    show_spi_transport_period,
531                    store_spi_transport_period);
532
533 static ssize_t
534 show_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
549 static ssize_t
550 store_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
563 static DEVICE_ATTR(min_period, S_IRUGO,
564                    show_spi_transport_min_period,
565                    store_spi_transport_min_period);
566
567
568 static 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 }
580 static 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 }
596 static DEVICE_ATTR(signalling, S_IRUGO,
597                    show_spi_host_signalling,
598                    store_spi_host_signalling);
599
600 static 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 }
608 static DEVICE_ATTR(host_width, S_IRUGO,
609                    show_spi_host_width, NULL);
610
611 static 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 }
619 static 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
626 enum 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 */
635 static enum spi_compare_returns
636 spi_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 */
721 static enum spi_compare_returns
722 spi_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
757 static enum spi_compare_returns
758 spi_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
815 static int
816 spi_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
862 static void
863 spi_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  */
1006 void
1007 spi_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 }
1054 EXPORT_SYMBOL(spi_dv_device);
1055
1056 struct work_queue_wrapper {
1057         struct work_struct      work;
1058         struct scsi_device      *sdev;
1059 };
1060
1061 static void
1062 spi_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  */
1084 void
1085 spi_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 }
1110 EXPORT_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  */
1120 void 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 }
1172 EXPORT_SYMBOL(spi_display_xfer_agreement);
1173
1174 int 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 }
1182 EXPORT_SYMBOL_GPL(spi_populate_width_msg);
1183
1184 int 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 }
1193 EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
1194
1195 int 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 }
1208 EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
1209
1210 #ifdef CONFIG_SCSI_CONSTANTS
1211 static 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
1222 static 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
1227 static 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
1233 static 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
1247 static 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
1254 int 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 }
1314 EXPORT_SYMBOL(spi_print_msg);
1315
1316 #else  /* ifndef CONFIG_SCSI_CONSTANTS */
1317
1318 int 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 }
1342 EXPORT_SYMBOL(spi_print_msg);
1343 #endif /* ! CONFIG_SCSI_CONSTANTS */
1344
1345 static 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
1369 static 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
1393 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1394                                "spi_transport",
1395                                spi_setup_transport_attrs,
1396                                NULL,
1397                                spi_target_configure);
1398
1399 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1400                                     spi_device_match,
1401                                     spi_device_configure);
1402
1403 static 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
1410 static struct attribute_group host_attribute_group = {
1411         .attrs = host_attributes,
1412 };
1413
1414 static 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
1437 static 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
1499 static 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
1520 static struct attribute_group target_attribute_group = {
1521         .attrs = target_attributes,
1522         .is_visible = target_attribute_is_visible,
1523 };
1524
1525 static 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
1537 struct scsi_transport_template *
1538 spi_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 }
1560 EXPORT_SYMBOL(spi_attach_transport);
1561
1562 void 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 }
1571 EXPORT_SYMBOL(spi_release_transport);
1572
1573 static __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
1596 static 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
1604 MODULE_AUTHOR("Martin Hicks");
1605 MODULE_DESCRIPTION("SPI Transport Attributes");
1606 MODULE_LICENSE("GPL");
1607
1608 module_init(spi_transport_init);
1609 module_exit(spi_transport_exit);