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