[SCSI] ibmvfc: Update driver version to 1.0.1
[linux-2.6] / drivers / scsi / scsi_transport_spi.c
1 /* 
2  *  Parallel SCSI (SPI) transport specific attributes exported to sysfs.
3  *
4  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
5  *  Copyright (c) 2004, 2005 James Bottomley <James.Bottomley@SteelEye.com>
6  *
7  *  This program is free software; you can redistribute it and/or modify
8  *  it under the terms of the GNU General Public License as published by
9  *  the Free Software Foundation; either version 2 of the License, or
10  *  (at your option) any later version.
11  *
12  *  This program is distributed in the hope that it will be useful,
13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  *  GNU General Public License for more details.
16  *
17  *  You should have received a copy of the GNU General Public License
18  *  along with this program; if not, write to the Free Software
19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20  */
21 #include <linux/ctype.h>
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/workqueue.h>
25 #include <linux/blkdev.h>
26 #include <linux/mutex.h>
27 #include <linux/sysfs.h>
28 #include <scsi/scsi.h>
29 #include "scsi_priv.h"
30 #include <scsi/scsi_device.h>
31 #include <scsi/scsi_host.h>
32 #include <scsi/scsi_cmnd.h>
33 #include <scsi/scsi_eh.h>
34 #include <scsi/scsi_transport.h>
35 #include <scsi/scsi_transport_spi.h>
36
37 #define SPI_NUM_ATTRS 14        /* increase this if you add attributes */
38 #define SPI_OTHER_ATTRS 1       /* Increase this if you add "always
39                                  * on" attributes */
40 #define SPI_HOST_ATTRS  1
41
42 #define SPI_MAX_ECHO_BUFFER_SIZE        4096
43
44 #define DV_LOOPS        3
45 #define DV_TIMEOUT      (10*HZ)
46 #define DV_RETRIES      3       /* should only need at most 
47                                  * two cc/ua clears */
48
49 /* Private data accessors (keep these out of the header file) */
50 #define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress)
51 #define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex)
52
53 struct spi_internal {
54         struct scsi_transport_template t;
55         struct spi_function_template *f;
56 };
57
58 #define to_spi_internal(tmpl)   container_of(tmpl, struct spi_internal, t)
59
60 static const int ppr_to_ps[] = {
61         /* The PPR values 0-6 are reserved, fill them in when
62          * the committee defines them */
63         -1,                     /* 0x00 */
64         -1,                     /* 0x01 */
65         -1,                     /* 0x02 */
66         -1,                     /* 0x03 */
67         -1,                     /* 0x04 */
68         -1,                     /* 0x05 */
69         -1,                     /* 0x06 */
70          3125,                  /* 0x07 */
71          6250,                  /* 0x08 */
72         12500,                  /* 0x09 */
73         25000,                  /* 0x0a */
74         30300,                  /* 0x0b */
75         50000,                  /* 0x0c */
76 };
77 /* The PPR values at which you calculate the period in ns by multiplying
78  * by 4 */
79 #define SPI_STATIC_PPR  0x0c
80
81 static int sprint_frac(char *dest, int value, int denom)
82 {
83         int frac = value % denom;
84         int result = sprintf(dest, "%d", value / denom);
85
86         if (frac == 0)
87                 return result;
88         dest[result++] = '.';
89
90         do {
91                 denom /= 10;
92                 sprintf(dest + result, "%d", frac / denom);
93                 result++;
94                 frac %= denom;
95         } while (frac);
96
97         dest[result++] = '\0';
98         return result;
99 }
100
101 static int spi_execute(struct scsi_device *sdev, const void *cmd,
102                        enum dma_data_direction dir,
103                        void *buffer, unsigned bufflen,
104                        struct scsi_sense_hdr *sshdr)
105 {
106         int i, result;
107         unsigned char sense[SCSI_SENSE_BUFFERSIZE];
108
109         for(i = 0; i < DV_RETRIES; i++) {
110                 result = scsi_execute(sdev, cmd, dir, buffer, bufflen,
111                                       sense, DV_TIMEOUT, /* retries */ 1,
112                                       REQ_FAILFAST);
113                 if (result & DRIVER_SENSE) {
114                         struct scsi_sense_hdr sshdr_tmp;
115                         if (!sshdr)
116                                 sshdr = &sshdr_tmp;
117
118                         if (scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE,
119                                                  sshdr)
120                             && sshdr->sense_key == UNIT_ATTENTION)
121                                 continue;
122                 }
123                 break;
124         }
125         return result;
126 }
127
128 static struct {
129         enum spi_signal_type    value;
130         char                    *name;
131 } signal_types[] = {
132         { SPI_SIGNAL_UNKNOWN, "unknown" },
133         { SPI_SIGNAL_SE, "SE" },
134         { SPI_SIGNAL_LVD, "LVD" },
135         { SPI_SIGNAL_HVD, "HVD" },
136 };
137
138 static inline const char *spi_signal_to_string(enum spi_signal_type type)
139 {
140         int i;
141
142         for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
143                 if (type == signal_types[i].value)
144                         return signal_types[i].name;
145         }
146         return NULL;
147 }
148 static inline enum spi_signal_type spi_signal_to_value(const char *name)
149 {
150         int i, len;
151
152         for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
153                 len =  strlen(signal_types[i].name);
154                 if (strncmp(name, signal_types[i].name, len) == 0 &&
155                     (name[len] == '\n' || name[len] == '\0'))
156                         return signal_types[i].value;
157         }
158         return SPI_SIGNAL_UNKNOWN;
159 }
160
161 static int spi_host_setup(struct transport_container *tc, struct device *dev,
162                           struct device *cdev)
163 {
164         struct Scsi_Host *shost = dev_to_shost(dev);
165
166         spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
167
168         return 0;
169 }
170
171 static int spi_host_configure(struct transport_container *tc,
172                               struct device *dev,
173                               struct device *cdev);
174
175 static DECLARE_TRANSPORT_CLASS(spi_host_class,
176                                "spi_host",
177                                spi_host_setup,
178                                NULL,
179                                spi_host_configure);
180
181 static int spi_host_match(struct attribute_container *cont,
182                           struct device *dev)
183 {
184         struct Scsi_Host *shost;
185
186         if (!scsi_is_host_device(dev))
187                 return 0;
188
189         shost = dev_to_shost(dev);
190         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
191             != &spi_host_class.class)
192                 return 0;
193
194         return &shost->transportt->host_attrs.ac == cont;
195 }
196
197 static int spi_target_configure(struct transport_container *tc,
198                                 struct device *dev,
199                                 struct device *cdev);
200
201 static int spi_device_configure(struct transport_container *tc,
202                                 struct device *dev,
203                                 struct device *cdev)
204 {
205         struct scsi_device *sdev = to_scsi_device(dev);
206         struct scsi_target *starget = sdev->sdev_target;
207
208         /* Populate the target capability fields with the values
209          * gleaned from the device inquiry */
210
211         spi_support_sync(starget) = scsi_device_sync(sdev);
212         spi_support_wide(starget) = scsi_device_wide(sdev);
213         spi_support_dt(starget) = scsi_device_dt(sdev);
214         spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
215         spi_support_ius(starget) = scsi_device_ius(sdev);
216         spi_support_qas(starget) = scsi_device_qas(sdev);
217
218         return 0;
219 }
220
221 static int spi_setup_transport_attrs(struct transport_container *tc,
222                                      struct device *dev,
223                                      struct device *cdev)
224 {
225         struct scsi_target *starget = to_scsi_target(dev);
226
227         spi_period(starget) = -1;       /* illegal value */
228         spi_min_period(starget) = 0;
229         spi_offset(starget) = 0;        /* async */
230         spi_max_offset(starget) = 255;
231         spi_width(starget) = 0; /* narrow */
232         spi_max_width(starget) = 1;
233         spi_iu(starget) = 0;    /* no IU */
234         spi_dt(starget) = 0;    /* ST */
235         spi_qas(starget) = 0;
236         spi_wr_flow(starget) = 0;
237         spi_rd_strm(starget) = 0;
238         spi_rti(starget) = 0;
239         spi_pcomp_en(starget) = 0;
240         spi_hold_mcs(starget) = 0;
241         spi_dv_pending(starget) = 0;
242         spi_dv_in_progress(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 device *dev,                  \
253                            struct device_attribute *attr, char *buf)    \
254 {                                                                       \
255         struct scsi_target *starget = transport_class_to_starget(dev);  \
256         struct spi_transport_attrs *tp;                                 \
257                                                                         \
258         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
259         return snprintf(buf, 20, format_string, tp->field);             \
260 }
261
262 #define spi_transport_store_simple(field, format_string)                \
263                                                                         \
264 static ssize_t                                                          \
265 store_spi_transport_##field(struct device *dev,                         \
266                             struct device_attribute *attr,              \
267                             const char *buf, size_t count)              \
268 {                                                                       \
269         int val;                                                        \
270         struct scsi_target *starget = transport_class_to_starget(dev);  \
271         struct spi_transport_attrs *tp;                                 \
272                                                                         \
273         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
274         val = simple_strtoul(buf, NULL, 0);                             \
275         tp->field = val;                                                \
276         return count;                                                   \
277 }
278
279 #define spi_transport_show_function(field, format_string)               \
280                                                                         \
281 static ssize_t                                                          \
282 show_spi_transport_##field(struct device *dev,                  \
283                            struct device_attribute *attr, char *buf)    \
284 {                                                                       \
285         struct scsi_target *starget = transport_class_to_starget(dev);  \
286         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
287         struct spi_transport_attrs *tp;                                 \
288         struct spi_internal *i = to_spi_internal(shost->transportt);    \
289         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
290         if (i->f->get_##field)                                          \
291                 i->f->get_##field(starget);                             \
292         return snprintf(buf, 20, format_string, tp->field);             \
293 }
294
295 #define spi_transport_store_function(field, format_string)              \
296 static ssize_t                                                          \
297 store_spi_transport_##field(struct device *dev,                         \
298                             struct device_attribute *attr,              \
299                             const char *buf, size_t count)              \
300 {                                                                       \
301         int val;                                                        \
302         struct scsi_target *starget = transport_class_to_starget(dev);  \
303         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
304         struct spi_internal *i = to_spi_internal(shost->transportt);    \
305                                                                         \
306         if (!i->f->set_##field)                                         \
307                 return -EINVAL;                                         \
308         val = simple_strtoul(buf, NULL, 0);                             \
309         i->f->set_##field(starget, val);                                \
310         return count;                                                   \
311 }
312
313 #define spi_transport_store_max(field, format_string)                   \
314 static ssize_t                                                          \
315 store_spi_transport_##field(struct device *dev,                         \
316                             struct device_attribute *attr,              \
317                             const char *buf, size_t count)              \
318 {                                                                       \
319         int val;                                                        \
320         struct scsi_target *starget = transport_class_to_starget(dev);  \
321         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
322         struct spi_internal *i = to_spi_internal(shost->transportt);    \
323         struct spi_transport_attrs *tp                                  \
324                 = (struct spi_transport_attrs *)&starget->starget_data; \
325                                                                         \
326         if (i->f->set_##field)                                          \
327                 return -EINVAL;                                         \
328         val = simple_strtoul(buf, NULL, 0);                             \
329         if (val > tp->max_##field)                                      \
330                 val = tp->max_##field;                                  \
331         i->f->set_##field(starget, val);                                \
332         return count;                                                   \
333 }
334
335 #define spi_transport_rd_attr(field, format_string)                     \
336         spi_transport_show_function(field, format_string)               \
337         spi_transport_store_function(field, format_string)              \
338 static DEVICE_ATTR(field, S_IRUGO,                              \
339                    show_spi_transport_##field,                  \
340                    store_spi_transport_##field);
341
342 #define spi_transport_simple_attr(field, format_string)                 \
343         spi_transport_show_simple(field, format_string)                 \
344         spi_transport_store_simple(field, format_string)                \
345 static DEVICE_ATTR(field, S_IRUGO,                              \
346                    show_spi_transport_##field,                  \
347                    store_spi_transport_##field);
348
349 #define spi_transport_max_attr(field, format_string)                    \
350         spi_transport_show_function(field, format_string)               \
351         spi_transport_store_max(field, format_string)                   \
352         spi_transport_simple_attr(max_##field, format_string)           \
353 static DEVICE_ATTR(field, S_IRUGO,                              \
354                    show_spi_transport_##field,                  \
355                    store_spi_transport_##field);
356
357 /* The Parallel SCSI Tranport Attributes: */
358 spi_transport_max_attr(offset, "%d\n");
359 spi_transport_max_attr(width, "%d\n");
360 spi_transport_rd_attr(iu, "%d\n");
361 spi_transport_rd_attr(dt, "%d\n");
362 spi_transport_rd_attr(qas, "%d\n");
363 spi_transport_rd_attr(wr_flow, "%d\n");
364 spi_transport_rd_attr(rd_strm, "%d\n");
365 spi_transport_rd_attr(rti, "%d\n");
366 spi_transport_rd_attr(pcomp_en, "%d\n");
367 spi_transport_rd_attr(hold_mcs, "%d\n");
368
369 /* we only care about the first child device so we return 1 */
370 static int child_iter(struct device *dev, void *data)
371 {
372         struct scsi_device *sdev = to_scsi_device(dev);
373
374         spi_dv_device(sdev);
375         return 1;
376 }
377
378 static ssize_t
379 store_spi_revalidate(struct device *dev, struct device_attribute *attr,
380                      const char *buf, size_t count)
381 {
382         struct scsi_target *starget = transport_class_to_starget(dev);
383
384         device_for_each_child(&starget->dev, NULL, child_iter);
385         return count;
386 }
387 static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
388
389 /* Translate the period into ns according to the current spec
390  * for SDTR/PPR messages */
391 static int period_to_str(char *buf, int period)
392 {
393         int len, picosec;
394
395         if (period < 0 || period > 0xff) {
396                 picosec = -1;
397         } else if (period <= SPI_STATIC_PPR) {
398                 picosec = ppr_to_ps[period];
399         } else {
400                 picosec = period * 4000;
401         }
402
403         if (picosec == -1) {
404                 len = sprintf(buf, "reserved");
405         } else {
406                 len = sprint_frac(buf, picosec, 1000);
407         }
408
409         return len;
410 }
411
412 static ssize_t
413 show_spi_transport_period_helper(char *buf, int period)
414 {
415         int len = period_to_str(buf, period);
416         buf[len++] = '\n';
417         buf[len] = '\0';
418         return len;
419 }
420
421 static ssize_t
422 store_spi_transport_period_helper(struct device *dev, const char *buf,
423                                   size_t count, int *periodp)
424 {
425         int j, picosec, period = -1;
426         char *endp;
427
428         picosec = simple_strtoul(buf, &endp, 10) * 1000;
429         if (*endp == '.') {
430                 int mult = 100;
431                 do {
432                         endp++;
433                         if (!isdigit(*endp))
434                                 break;
435                         picosec += (*endp - '0') * mult;
436                         mult /= 10;
437                 } while (mult > 0);
438         }
439
440         for (j = 0; j <= SPI_STATIC_PPR; j++) {
441                 if (ppr_to_ps[j] < picosec)
442                         continue;
443                 period = j;
444                 break;
445         }
446
447         if (period == -1)
448                 period = picosec / 4000;
449
450         if (period > 0xff)
451                 period = 0xff;
452
453         *periodp = period;
454
455         return count;
456 }
457
458 static ssize_t
459 show_spi_transport_period(struct device *dev,
460                           struct device_attribute *attr, char *buf)
461 {
462         struct scsi_target *starget = transport_class_to_starget(dev);
463         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
464         struct spi_internal *i = to_spi_internal(shost->transportt);
465         struct spi_transport_attrs *tp =
466                 (struct spi_transport_attrs *)&starget->starget_data;
467
468         if (i->f->get_period)
469                 i->f->get_period(starget);
470
471         return show_spi_transport_period_helper(buf, tp->period);
472 }
473
474 static ssize_t
475 store_spi_transport_period(struct device *cdev, struct device_attribute *attr,
476                            const char *buf, size_t count)
477 {
478         struct scsi_target *starget = transport_class_to_starget(cdev);
479         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
480         struct spi_internal *i = to_spi_internal(shost->transportt);
481         struct spi_transport_attrs *tp =
482                 (struct spi_transport_attrs *)&starget->starget_data;
483         int period, retval;
484
485         if (!i->f->set_period)
486                 return -EINVAL;
487
488         retval = store_spi_transport_period_helper(cdev, buf, count, &period);
489
490         if (period < tp->min_period)
491                 period = tp->min_period;
492
493         i->f->set_period(starget, period);
494
495         return retval;
496 }
497
498 static DEVICE_ATTR(period, S_IRUGO,
499                    show_spi_transport_period,
500                    store_spi_transport_period);
501
502 static ssize_t
503 show_spi_transport_min_period(struct device *cdev,
504                               struct device_attribute *attr, char *buf)
505 {
506         struct scsi_target *starget = transport_class_to_starget(cdev);
507         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
508         struct spi_internal *i = to_spi_internal(shost->transportt);
509         struct spi_transport_attrs *tp =
510                 (struct spi_transport_attrs *)&starget->starget_data;
511
512         if (!i->f->set_period)
513                 return -EINVAL;
514
515         return show_spi_transport_period_helper(buf, tp->min_period);
516 }
517
518 static ssize_t
519 store_spi_transport_min_period(struct device *cdev,
520                                struct device_attribute *attr,
521                                const char *buf, size_t count)
522 {
523         struct scsi_target *starget = transport_class_to_starget(cdev);
524         struct spi_transport_attrs *tp =
525                 (struct spi_transport_attrs *)&starget->starget_data;
526
527         return store_spi_transport_period_helper(cdev, buf, count,
528                                                  &tp->min_period);
529 }
530
531
532 static DEVICE_ATTR(min_period, S_IRUGO,
533                    show_spi_transport_min_period,
534                    store_spi_transport_min_period);
535
536
537 static ssize_t show_spi_host_signalling(struct device *cdev,
538                                         struct device_attribute *attr,
539                                         char *buf)
540 {
541         struct Scsi_Host *shost = transport_class_to_shost(cdev);
542         struct spi_internal *i = to_spi_internal(shost->transportt);
543
544         if (i->f->get_signalling)
545                 i->f->get_signalling(shost);
546
547         return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
548 }
549 static ssize_t store_spi_host_signalling(struct device *dev,
550                                          struct device_attribute *attr,
551                                          const char *buf, size_t count)
552 {
553         struct Scsi_Host *shost = transport_class_to_shost(dev);
554         struct spi_internal *i = to_spi_internal(shost->transportt);
555         enum spi_signal_type type = spi_signal_to_value(buf);
556
557         if (!i->f->set_signalling)
558                 return -EINVAL;
559
560         if (type != SPI_SIGNAL_UNKNOWN)
561                 i->f->set_signalling(shost, type);
562
563         return count;
564 }
565 static DEVICE_ATTR(signalling, S_IRUGO,
566                    show_spi_host_signalling,
567                    store_spi_host_signalling);
568
569 #define DV_SET(x, y)                    \
570         if(i->f->set_##x)               \
571                 i->f->set_##x(sdev->sdev_target, y)
572
573 enum spi_compare_returns {
574         SPI_COMPARE_SUCCESS,
575         SPI_COMPARE_FAILURE,
576         SPI_COMPARE_SKIP_TEST,
577 };
578
579
580 /* This is for read/write Domain Validation:  If the device supports
581  * an echo buffer, we do read/write tests to it */
582 static enum spi_compare_returns
583 spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,
584                           u8 *ptr, const int retries)
585 {
586         int len = ptr - buffer;
587         int j, k, r, result;
588         unsigned int pattern = 0x0000ffff;
589         struct scsi_sense_hdr sshdr;
590
591         const char spi_write_buffer[] = {
592                 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
593         };
594         const char spi_read_buffer[] = {
595                 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
596         };
597
598         /* set up the pattern buffer.  Doesn't matter if we spill
599          * slightly beyond since that's where the read buffer is */
600         for (j = 0; j < len; ) {
601
602                 /* fill the buffer with counting (test a) */
603                 for ( ; j < min(len, 32); j++)
604                         buffer[j] = j;
605                 k = j;
606                 /* fill the buffer with alternating words of 0x0 and
607                  * 0xffff (test b) */
608                 for ( ; j < min(len, k + 32); j += 2) {
609                         u16 *word = (u16 *)&buffer[j];
610                         
611                         *word = (j & 0x02) ? 0x0000 : 0xffff;
612                 }
613                 k = j;
614                 /* fill with crosstalk (alternating 0x5555 0xaaa)
615                  * (test c) */
616                 for ( ; j < min(len, k + 32); j += 2) {
617                         u16 *word = (u16 *)&buffer[j];
618
619                         *word = (j & 0x02) ? 0x5555 : 0xaaaa;
620                 }
621                 k = j;
622                 /* fill with shifting bits (test d) */
623                 for ( ; j < min(len, k + 32); j += 4) {
624                         u32 *word = (unsigned int *)&buffer[j];
625                         u32 roll = (pattern & 0x80000000) ? 1 : 0;
626                         
627                         *word = pattern;
628                         pattern = (pattern << 1) | roll;
629                 }
630                 /* don't bother with random data (test e) */
631         }
632
633         for (r = 0; r < retries; r++) {
634                 result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE,
635                                      buffer, len, &sshdr);
636                 if(result || !scsi_device_online(sdev)) {
637
638                         scsi_device_set_state(sdev, SDEV_QUIESCE);
639                         if (scsi_sense_valid(&sshdr)
640                             && sshdr.sense_key == ILLEGAL_REQUEST
641                             /* INVALID FIELD IN CDB */
642                             && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
643                                 /* This would mean that the drive lied
644                                  * to us about supporting an echo
645                                  * buffer (unfortunately some Western
646                                  * Digital drives do precisely this)
647                                  */
648                                 return SPI_COMPARE_SKIP_TEST;
649
650
651                         sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
652                         return SPI_COMPARE_FAILURE;
653                 }
654
655                 memset(ptr, 0, len);
656                 spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE,
657                             ptr, len, NULL);
658                 scsi_device_set_state(sdev, SDEV_QUIESCE);
659
660                 if (memcmp(buffer, ptr, len) != 0)
661                         return SPI_COMPARE_FAILURE;
662         }
663         return SPI_COMPARE_SUCCESS;
664 }
665
666 /* This is for the simplest form of Domain Validation: a read test
667  * on the inquiry data from the device */
668 static enum spi_compare_returns
669 spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,
670                               u8 *ptr, const int retries)
671 {
672         int r, result;
673         const int len = sdev->inquiry_len;
674         const char spi_inquiry[] = {
675                 INQUIRY, 0, 0, 0, len, 0
676         };
677
678         for (r = 0; r < retries; r++) {
679                 memset(ptr, 0, len);
680
681                 result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE,
682                                      ptr, len, NULL);
683                 
684                 if(result || !scsi_device_online(sdev)) {
685                         scsi_device_set_state(sdev, SDEV_QUIESCE);
686                         return SPI_COMPARE_FAILURE;
687                 }
688
689                 /* If we don't have the inquiry data already, the
690                  * first read gets it */
691                 if (ptr == buffer) {
692                         ptr += len;
693                         --r;
694                         continue;
695                 }
696
697                 if (memcmp(buffer, ptr, len) != 0)
698                         /* failure */
699                         return SPI_COMPARE_FAILURE;
700         }
701         return SPI_COMPARE_SUCCESS;
702 }
703
704 static enum spi_compare_returns
705 spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,
706                enum spi_compare_returns 
707                (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
708 {
709         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
710         struct scsi_target *starget = sdev->sdev_target;
711         int period = 0, prevperiod = 0; 
712         enum spi_compare_returns retval;
713
714
715         for (;;) {
716                 int newperiod;
717                 retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
718
719                 if (retval == SPI_COMPARE_SUCCESS
720                     || retval == SPI_COMPARE_SKIP_TEST)
721                         break;
722
723                 /* OK, retrain, fallback */
724                 if (i->f->get_iu)
725                         i->f->get_iu(starget);
726                 if (i->f->get_qas)
727                         i->f->get_qas(starget);
728                 if (i->f->get_period)
729                         i->f->get_period(sdev->sdev_target);
730
731                 /* Here's the fallback sequence; first try turning off
732                  * IU, then QAS (if we can control them), then finally
733                  * fall down the periods */
734                 if (i->f->set_iu && spi_iu(starget)) {
735                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n");
736                         DV_SET(iu, 0);
737                 } else if (i->f->set_qas && spi_qas(starget)) {
738                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n");
739                         DV_SET(qas, 0);
740                 } else {
741                         newperiod = spi_period(starget);
742                         period = newperiod > period ? newperiod : period;
743                         if (period < 0x0d)
744                                 period++;
745                         else
746                                 period += period >> 1;
747
748                         if (unlikely(period > 0xff || period == prevperiod)) {
749                                 /* Total failure; set to async and return */
750                                 starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
751                                 DV_SET(offset, 0);
752                                 return SPI_COMPARE_FAILURE;
753                         }
754                         starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");
755                         DV_SET(period, period);
756                         prevperiod = period;
757                 }
758         }
759         return retval;
760 }
761
762 static int
763 spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)
764 {
765         int l, result;
766
767         /* first off do a test unit ready.  This can error out 
768          * because of reservations or some other reason.  If it
769          * fails, the device won't let us write to the echo buffer
770          * so just return failure */
771         
772         const char spi_test_unit_ready[] = {
773                 TEST_UNIT_READY, 0, 0, 0, 0, 0
774         };
775
776         const char spi_read_buffer_descriptor[] = {
777                 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
778         };
779
780         
781         /* We send a set of three TURs to clear any outstanding 
782          * unit attention conditions if they exist (Otherwise the
783          * buffer tests won't be happy).  If the TUR still fails
784          * (reservation conflict, device not ready, etc) just
785          * skip the write tests */
786         for (l = 0; ; l++) {
787                 result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE, 
788                                      NULL, 0, NULL);
789
790                 if(result) {
791                         if(l >= 3)
792                                 return 0;
793                 } else {
794                         /* TUR succeeded */
795                         break;
796                 }
797         }
798
799         result = spi_execute(sdev, spi_read_buffer_descriptor, 
800                              DMA_FROM_DEVICE, buffer, 4, NULL);
801
802         if (result)
803                 /* Device has no echo buffer */
804                 return 0;
805
806         return buffer[3] + ((buffer[2] & 0x1f) << 8);
807 }
808
809 static void
810 spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
811 {
812         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
813         struct scsi_target *starget = sdev->sdev_target;
814         struct Scsi_Host *shost = sdev->host;
815         int len = sdev->inquiry_len;
816         int min_period = spi_min_period(starget);
817         int max_width = spi_max_width(starget);
818         /* first set us up for narrow async */
819         DV_SET(offset, 0);
820         DV_SET(width, 0);
821
822         if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
823             != SPI_COMPARE_SUCCESS) {
824                 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
825                 /* FIXME: should probably offline the device here? */
826                 return;
827         }
828
829         if (!scsi_device_wide(sdev)) {
830                 spi_max_width(starget) = 0;
831                 max_width = 0;
832         }
833
834         /* test width */
835         if (i->f->set_width && max_width) {
836                 i->f->set_width(starget, 1);
837
838                 if (spi_dv_device_compare_inquiry(sdev, buffer,
839                                                    buffer + len,
840                                                    DV_LOOPS)
841                     != SPI_COMPARE_SUCCESS) {
842                         starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
843                         i->f->set_width(starget, 0);
844                         /* Make sure we don't force wide back on by asking
845                          * for a transfer period that requires it */
846                         max_width = 0;
847                         if (min_period < 10)
848                                 min_period = 10;
849                 }
850         }
851
852         if (!i->f->set_period)
853                 return;
854
855         /* device can't handle synchronous */
856         if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev))
857                 return;
858
859         /* len == -1 is the signal that we need to ascertain the
860          * presence of an echo buffer before trying to use it.  len ==
861          * 0 means we don't have an echo buffer */
862         len = -1;
863
864  retry:
865
866         /* now set up to the maximum */
867         DV_SET(offset, spi_max_offset(starget));
868         DV_SET(period, min_period);
869
870         /* try QAS requests; this should be harmless to set if the
871          * target supports it */
872         if (scsi_device_qas(sdev)) {
873                 DV_SET(qas, 1);
874         } else {
875                 DV_SET(qas, 0);
876         }
877
878         if (scsi_device_ius(sdev) && min_period < 9) {
879                 /* This u320 (or u640). Set IU transfers */
880                 DV_SET(iu, 1);
881                 /* Then set the optional parameters */
882                 DV_SET(rd_strm, 1);
883                 DV_SET(wr_flow, 1);
884                 DV_SET(rti, 1);
885                 if (min_period == 8)
886                         DV_SET(pcomp_en, 1);
887         } else {
888                 DV_SET(iu, 0);
889         }
890
891         /* now that we've done all this, actually check the bus
892          * signal type (if known).  Some devices are stupid on
893          * a SE bus and still claim they can try LVD only settings */
894         if (i->f->get_signalling)
895                 i->f->get_signalling(shost);
896         if (spi_signalling(shost) == SPI_SIGNAL_SE ||
897             spi_signalling(shost) == SPI_SIGNAL_HVD ||
898             !scsi_device_dt(sdev)) {
899                 DV_SET(dt, 0);
900         } else {
901                 DV_SET(dt, 1);
902         }
903         /* set width last because it will pull all the other
904          * parameters down to required values */
905         DV_SET(width, max_width);
906
907         /* Do the read only INQUIRY tests */
908         spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
909                        spi_dv_device_compare_inquiry);
910         /* See if we actually managed to negotiate and sustain DT */
911         if (i->f->get_dt)
912                 i->f->get_dt(starget);
913
914         /* see if the device has an echo buffer.  If it does we can do
915          * the SPI pattern write tests.  Because of some broken
916          * devices, we *only* try this on a device that has actually
917          * negotiated DT */
918
919         if (len == -1 && spi_dt(starget))
920                 len = spi_dv_device_get_echo_buffer(sdev, buffer);
921
922         if (len <= 0) {
923                 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
924                 return;
925         }
926
927         if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
928                 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
929                 len = SPI_MAX_ECHO_BUFFER_SIZE;
930         }
931
932         if (spi_dv_retrain(sdev, buffer, buffer + len,
933                            spi_dv_device_echo_buffer)
934             == SPI_COMPARE_SKIP_TEST) {
935                 /* OK, the stupid drive can't do a write echo buffer
936                  * test after all, fall back to the read tests */
937                 len = 0;
938                 goto retry;
939         }
940 }
941
942
943 /**     spi_dv_device - Do Domain Validation on the device
944  *      @sdev:          scsi device to validate
945  *
946  *      Performs the domain validation on the given device in the
947  *      current execution thread.  Since DV operations may sleep,
948  *      the current thread must have user context.  Also no SCSI
949  *      related locks that would deadlock I/O issued by the DV may
950  *      be held.
951  */
952 void
953 spi_dv_device(struct scsi_device *sdev)
954 {
955         struct scsi_target *starget = sdev->sdev_target;
956         u8 *buffer;
957         const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
958
959         if (unlikely(scsi_device_get(sdev)))
960                 return;
961
962         if (unlikely(spi_dv_in_progress(starget)))
963                 return;
964         spi_dv_in_progress(starget) = 1;
965
966         buffer = kzalloc(len, GFP_KERNEL);
967
968         if (unlikely(!buffer))
969                 goto out_put;
970
971         /* We need to verify that the actual device will quiesce; the
972          * later target quiesce is just a nice to have */
973         if (unlikely(scsi_device_quiesce(sdev)))
974                 goto out_free;
975
976         scsi_target_quiesce(starget);
977
978         spi_dv_pending(starget) = 1;
979         mutex_lock(&spi_dv_mutex(starget));
980
981         starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
982
983         spi_dv_device_internal(sdev, buffer);
984
985         starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
986
987         mutex_unlock(&spi_dv_mutex(starget));
988         spi_dv_pending(starget) = 0;
989
990         scsi_target_resume(starget);
991
992         spi_initial_dv(starget) = 1;
993
994  out_free:
995         kfree(buffer);
996  out_put:
997         spi_dv_in_progress(starget) = 0;
998         scsi_device_put(sdev);
999 }
1000 EXPORT_SYMBOL(spi_dv_device);
1001
1002 struct work_queue_wrapper {
1003         struct work_struct      work;
1004         struct scsi_device      *sdev;
1005 };
1006
1007 static void
1008 spi_dv_device_work_wrapper(struct work_struct *work)
1009 {
1010         struct work_queue_wrapper *wqw =
1011                 container_of(work, struct work_queue_wrapper, work);
1012         struct scsi_device *sdev = wqw->sdev;
1013
1014         kfree(wqw);
1015         spi_dv_device(sdev);
1016         spi_dv_pending(sdev->sdev_target) = 0;
1017         scsi_device_put(sdev);
1018 }
1019
1020
1021 /**
1022  *      spi_schedule_dv_device - schedule domain validation to occur on the device
1023  *      @sdev:  The device to validate
1024  *
1025  *      Identical to spi_dv_device() above, except that the DV will be
1026  *      scheduled to occur in a workqueue later.  All memory allocations
1027  *      are atomic, so may be called from any context including those holding
1028  *      SCSI locks.
1029  */
1030 void
1031 spi_schedule_dv_device(struct scsi_device *sdev)
1032 {
1033         struct work_queue_wrapper *wqw =
1034                 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
1035
1036         if (unlikely(!wqw))
1037                 return;
1038
1039         if (unlikely(spi_dv_pending(sdev->sdev_target))) {
1040                 kfree(wqw);
1041                 return;
1042         }
1043         /* Set pending early (dv_device doesn't check it, only sets it) */
1044         spi_dv_pending(sdev->sdev_target) = 1;
1045         if (unlikely(scsi_device_get(sdev))) {
1046                 kfree(wqw);
1047                 spi_dv_pending(sdev->sdev_target) = 0;
1048                 return;
1049         }
1050
1051         INIT_WORK(&wqw->work, spi_dv_device_work_wrapper);
1052         wqw->sdev = sdev;
1053
1054         schedule_work(&wqw->work);
1055 }
1056 EXPORT_SYMBOL(spi_schedule_dv_device);
1057
1058 /**
1059  * spi_display_xfer_agreement - Print the current target transfer agreement
1060  * @starget: The target for which to display the agreement
1061  *
1062  * Each SPI port is required to maintain a transfer agreement for each
1063  * other port on the bus.  This function prints a one-line summary of
1064  * the current agreement; more detailed information is available in sysfs.
1065  */
1066 void spi_display_xfer_agreement(struct scsi_target *starget)
1067 {
1068         struct spi_transport_attrs *tp;
1069         tp = (struct spi_transport_attrs *)&starget->starget_data;
1070
1071         if (tp->offset > 0 && tp->period > 0) {
1072                 unsigned int picosec, kb100;
1073                 char *scsi = "FAST-?";
1074                 char tmp[8];
1075
1076                 if (tp->period <= SPI_STATIC_PPR) {
1077                         picosec = ppr_to_ps[tp->period];
1078                         switch (tp->period) {
1079                                 case  7: scsi = "FAST-320"; break;
1080                                 case  8: scsi = "FAST-160"; break;
1081                                 case  9: scsi = "FAST-80"; break;
1082                                 case 10:
1083                                 case 11: scsi = "FAST-40"; break;
1084                                 case 12: scsi = "FAST-20"; break;
1085                         }
1086                 } else {
1087                         picosec = tp->period * 4000;
1088                         if (tp->period < 25)
1089                                 scsi = "FAST-20";
1090                         else if (tp->period < 50)
1091                                 scsi = "FAST-10";
1092                         else
1093                                 scsi = "FAST-5";
1094                 }
1095
1096                 kb100 = (10000000 + picosec / 2) / picosec;
1097                 if (tp->width)
1098                         kb100 *= 2;
1099                 sprint_frac(tmp, picosec, 1000);
1100
1101                 dev_info(&starget->dev,
1102                          "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1103                          scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1104                          tp->dt ? "DT" : "ST",
1105                          tp->iu ? " IU" : "",
1106                          tp->qas  ? " QAS" : "",
1107                          tp->rd_strm ? " RDSTRM" : "",
1108                          tp->rti ? " RTI" : "",
1109                          tp->wr_flow ? " WRFLOW" : "",
1110                          tp->pcomp_en ? " PCOMP" : "",
1111                          tp->hold_mcs ? " HMCS" : "",
1112                          tmp, tp->offset);
1113         } else {
1114                 dev_info(&starget->dev, "%sasynchronous\n",
1115                                 tp->width ? "wide " : "");
1116         }
1117 }
1118 EXPORT_SYMBOL(spi_display_xfer_agreement);
1119
1120 int spi_populate_width_msg(unsigned char *msg, int width)
1121 {
1122         msg[0] = EXTENDED_MESSAGE;
1123         msg[1] = 2;
1124         msg[2] = EXTENDED_WDTR;
1125         msg[3] = width;
1126         return 4;
1127 }
1128 EXPORT_SYMBOL_GPL(spi_populate_width_msg);
1129
1130 int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
1131 {
1132         msg[0] = EXTENDED_MESSAGE;
1133         msg[1] = 3;
1134         msg[2] = EXTENDED_SDTR;
1135         msg[3] = period;
1136         msg[4] = offset;
1137         return 5;
1138 }
1139 EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
1140
1141 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
1142                 int width, int options)
1143 {
1144         msg[0] = EXTENDED_MESSAGE;
1145         msg[1] = 6;
1146         msg[2] = EXTENDED_PPR;
1147         msg[3] = period;
1148         msg[4] = 0;
1149         msg[5] = offset;
1150         msg[6] = width;
1151         msg[7] = options;
1152         return 8;
1153 }
1154 EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
1155
1156 #ifdef CONFIG_SCSI_CONSTANTS
1157 static const char * const one_byte_msgs[] = {
1158 /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",
1159 /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error", 
1160 /* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",
1161 /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1162 /* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set", 
1163 /* 0x0f */ "Initiate Recovery", "Release Recovery",
1164 /* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",
1165 /* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"
1166 };
1167
1168 static const char * const two_byte_msgs[] = {
1169 /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
1170 /* 0x23 */ "Ignore Wide Residue", "ACA"
1171 };
1172
1173 static const char * const extended_msgs[] = {
1174 /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1175 /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",
1176 /* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"
1177 };
1178
1179 static void print_nego(const unsigned char *msg, int per, int off, int width)
1180 {
1181         if (per) {
1182                 char buf[20];
1183                 period_to_str(buf, msg[per]);
1184                 printk("period = %s ns ", buf);
1185         }
1186
1187         if (off)
1188                 printk("offset = %d ", msg[off]);
1189         if (width)
1190                 printk("width = %d ", 8 << msg[width]);
1191 }
1192
1193 static void print_ptr(const unsigned char *msg, int msb, const char *desc)
1194 {
1195         int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |
1196                         msg[msb+3];
1197         printk("%s = %d ", desc, ptr);
1198 }
1199
1200 int spi_print_msg(const unsigned char *msg)
1201 {
1202         int len = 1, i;
1203         if (msg[0] == EXTENDED_MESSAGE) {
1204                 len = 2 + msg[1];
1205                 if (len == 2)
1206                         len += 256;
1207                 if (msg[2] < ARRAY_SIZE(extended_msgs))
1208                         printk ("%s ", extended_msgs[msg[2]]); 
1209                 else 
1210                         printk ("Extended Message, reserved code (0x%02x) ",
1211                                 (int) msg[2]);
1212                 switch (msg[2]) {
1213                 case EXTENDED_MODIFY_DATA_POINTER:
1214                         print_ptr(msg, 3, "pointer");
1215                         break;
1216                 case EXTENDED_SDTR:
1217                         print_nego(msg, 3, 4, 0);
1218                         break;
1219                 case EXTENDED_WDTR:
1220                         print_nego(msg, 0, 0, 3);
1221                         break;
1222                 case EXTENDED_PPR:
1223                         print_nego(msg, 3, 5, 6);
1224                         break;
1225                 case EXTENDED_MODIFY_BIDI_DATA_PTR:
1226                         print_ptr(msg, 3, "out");
1227                         print_ptr(msg, 7, "in");
1228                         break;
1229                 default:
1230                 for (i = 2; i < len; ++i) 
1231                         printk("%02x ", msg[i]);
1232                 }
1233         /* Identify */
1234         } else if (msg[0] & 0x80) {
1235                 printk("Identify disconnect %sallowed %s %d ",
1236                         (msg[0] & 0x40) ? "" : "not ",
1237                         (msg[0] & 0x20) ? "target routine" : "lun",
1238                         msg[0] & 0x7);
1239         /* Normal One byte */
1240         } else if (msg[0] < 0x1f) {
1241                 if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])
1242                         printk("%s ", one_byte_msgs[msg[0]]);
1243                 else
1244                         printk("reserved (%02x) ", msg[0]);
1245         } else if (msg[0] == 0x55) {
1246                 printk("QAS Request ");
1247         /* Two byte */
1248         } else if (msg[0] <= 0x2f) {
1249                 if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))
1250                         printk("%s %02x ", two_byte_msgs[msg[0] - 0x20], 
1251                                 msg[1]);
1252                 else 
1253                         printk("reserved two byte (%02x %02x) ", 
1254                                 msg[0], msg[1]);
1255                 len = 2;
1256         } else 
1257                 printk("reserved ");
1258         return len;
1259 }
1260 EXPORT_SYMBOL(spi_print_msg);
1261
1262 #else  /* ifndef CONFIG_SCSI_CONSTANTS */
1263
1264 int spi_print_msg(const unsigned char *msg)
1265 {
1266         int len = 1, i;
1267
1268         if (msg[0] == EXTENDED_MESSAGE) {
1269                 len = 2 + msg[1];
1270                 if (len == 2)
1271                         len += 256;
1272                 for (i = 0; i < len; ++i)
1273                         printk("%02x ", msg[i]);
1274         /* Identify */
1275         } else if (msg[0] & 0x80) {
1276                 printk("%02x ", msg[0]);
1277         /* Normal One byte */
1278         } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {
1279                 printk("%02x ", msg[0]);
1280         /* Two byte */
1281         } else if (msg[0] <= 0x2f) {
1282                 printk("%02x %02x", msg[0], msg[1]);
1283                 len = 2;
1284         } else 
1285                 printk("%02x ", msg[0]);
1286         return len;
1287 }
1288 EXPORT_SYMBOL(spi_print_msg);
1289 #endif /* ! CONFIG_SCSI_CONSTANTS */
1290
1291 static int spi_device_match(struct attribute_container *cont,
1292                             struct device *dev)
1293 {
1294         struct scsi_device *sdev;
1295         struct Scsi_Host *shost;
1296         struct spi_internal *i;
1297
1298         if (!scsi_is_sdev_device(dev))
1299                 return 0;
1300
1301         sdev = to_scsi_device(dev);
1302         shost = sdev->host;
1303         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1304             != &spi_host_class.class)
1305                 return 0;
1306         /* Note: this class has no device attributes, so it has
1307          * no per-HBA allocation and thus we don't need to distinguish
1308          * the attribute containers for the device */
1309         i = to_spi_internal(shost->transportt);
1310         if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1311                 return 0;
1312         return 1;
1313 }
1314
1315 static int spi_target_match(struct attribute_container *cont,
1316                             struct device *dev)
1317 {
1318         struct Scsi_Host *shost;
1319         struct scsi_target *starget;
1320         struct spi_internal *i;
1321
1322         if (!scsi_is_target_device(dev))
1323                 return 0;
1324
1325         shost = dev_to_shost(dev->parent);
1326         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1327             != &spi_host_class.class)
1328                 return 0;
1329
1330         i = to_spi_internal(shost->transportt);
1331         starget = to_scsi_target(dev);
1332
1333         if (i->f->deny_binding && i->f->deny_binding(starget))
1334                 return 0;
1335
1336         return &i->t.target_attrs.ac == cont;
1337 }
1338
1339 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1340                                "spi_transport",
1341                                spi_setup_transport_attrs,
1342                                NULL,
1343                                spi_target_configure);
1344
1345 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1346                                     spi_device_match,
1347                                     spi_device_configure);
1348
1349 static struct attribute *host_attributes[] = {
1350         &dev_attr_signalling.attr,
1351         NULL
1352 };
1353
1354 static struct attribute_group host_attribute_group = {
1355         .attrs = host_attributes,
1356 };
1357
1358 static int spi_host_configure(struct transport_container *tc,
1359                               struct device *dev,
1360                               struct device *cdev)
1361 {
1362         struct kobject *kobj = &cdev->kobj;
1363         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1364         struct spi_internal *si = to_spi_internal(shost->transportt);
1365         struct attribute *attr = &dev_attr_signalling.attr;
1366         int rc = 0;
1367
1368         if (si->f->set_signalling)
1369                 rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR);
1370
1371         return rc;
1372 }
1373
1374 /* returns true if we should be showing the variable.  Also
1375  * overloads the return by setting 1<<1 if the attribute should
1376  * be writeable */
1377 #define TARGET_ATTRIBUTE_HELPER(name) \
1378         (si->f->show_##name ? S_IRUGO : 0) | \
1379         (si->f->set_##name ? S_IWUSR : 0)
1380
1381 static mode_t target_attribute_is_visible(struct kobject *kobj,
1382                                           struct attribute *attr, int i)
1383 {
1384         struct device *cdev = container_of(kobj, struct device, kobj);
1385         struct scsi_target *starget = transport_class_to_starget(cdev);
1386         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1387         struct spi_internal *si = to_spi_internal(shost->transportt);
1388
1389         if (attr == &dev_attr_period.attr &&
1390             spi_support_sync(starget))
1391                 return TARGET_ATTRIBUTE_HELPER(period);
1392         else if (attr == &dev_attr_min_period.attr &&
1393                  spi_support_sync(starget))
1394                 return TARGET_ATTRIBUTE_HELPER(period);
1395         else if (attr == &dev_attr_offset.attr &&
1396                  spi_support_sync(starget))
1397                 return TARGET_ATTRIBUTE_HELPER(offset);
1398         else if (attr == &dev_attr_max_offset.attr &&
1399                  spi_support_sync(starget))
1400                 return TARGET_ATTRIBUTE_HELPER(offset);
1401         else if (attr == &dev_attr_width.attr &&
1402                  spi_support_wide(starget))
1403                 return TARGET_ATTRIBUTE_HELPER(width);
1404         else if (attr == &dev_attr_max_width.attr &&
1405                  spi_support_wide(starget))
1406                 return TARGET_ATTRIBUTE_HELPER(width);
1407         else if (attr == &dev_attr_iu.attr &&
1408                  spi_support_ius(starget))
1409                 return TARGET_ATTRIBUTE_HELPER(iu);
1410         else if (attr == &dev_attr_dt.attr &&
1411                  spi_support_dt(starget))
1412                 return TARGET_ATTRIBUTE_HELPER(dt);
1413         else if (attr == &dev_attr_qas.attr &&
1414                  spi_support_qas(starget))
1415                 return TARGET_ATTRIBUTE_HELPER(qas);
1416         else if (attr == &dev_attr_wr_flow.attr &&
1417                  spi_support_ius(starget))
1418                 return TARGET_ATTRIBUTE_HELPER(wr_flow);
1419         else if (attr == &dev_attr_rd_strm.attr &&
1420                  spi_support_ius(starget))
1421                 return TARGET_ATTRIBUTE_HELPER(rd_strm);
1422         else if (attr == &dev_attr_rti.attr &&
1423                  spi_support_ius(starget))
1424                 return TARGET_ATTRIBUTE_HELPER(rti);
1425         else if (attr == &dev_attr_pcomp_en.attr &&
1426                  spi_support_ius(starget))
1427                 return TARGET_ATTRIBUTE_HELPER(pcomp_en);
1428         else if (attr == &dev_attr_hold_mcs.attr &&
1429                  spi_support_ius(starget))
1430                 return TARGET_ATTRIBUTE_HELPER(hold_mcs);
1431         else if (attr == &dev_attr_revalidate.attr)
1432                 return S_IWUSR;
1433
1434         return 0;
1435 }
1436
1437 static struct attribute *target_attributes[] = {
1438         &dev_attr_period.attr,
1439         &dev_attr_min_period.attr,
1440         &dev_attr_offset.attr,
1441         &dev_attr_max_offset.attr,
1442         &dev_attr_width.attr,
1443         &dev_attr_max_width.attr,
1444         &dev_attr_iu.attr,
1445         &dev_attr_dt.attr,
1446         &dev_attr_qas.attr,
1447         &dev_attr_wr_flow.attr,
1448         &dev_attr_rd_strm.attr,
1449         &dev_attr_rti.attr,
1450         &dev_attr_pcomp_en.attr,
1451         &dev_attr_hold_mcs.attr,
1452         &dev_attr_revalidate.attr,
1453         NULL
1454 };
1455
1456 static struct attribute_group target_attribute_group = {
1457         .attrs = target_attributes,
1458         .is_visible = target_attribute_is_visible,
1459 };
1460
1461 static int spi_target_configure(struct transport_container *tc,
1462                                 struct device *dev,
1463                                 struct device *cdev)
1464 {
1465         struct kobject *kobj = &cdev->kobj;
1466
1467         /* force an update based on parameters read from the device */
1468         sysfs_update_group(kobj, &target_attribute_group);
1469
1470         return 0;
1471 }
1472
1473 struct scsi_transport_template *
1474 spi_attach_transport(struct spi_function_template *ft)
1475 {
1476         struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
1477                                          GFP_KERNEL);
1478
1479         if (unlikely(!i))
1480                 return NULL;
1481
1482         i->t.target_attrs.ac.class = &spi_transport_class.class;
1483         i->t.target_attrs.ac.grp = &target_attribute_group;
1484         i->t.target_attrs.ac.match = spi_target_match;
1485         transport_container_register(&i->t.target_attrs);
1486         i->t.target_size = sizeof(struct spi_transport_attrs);
1487         i->t.host_attrs.ac.class = &spi_host_class.class;
1488         i->t.host_attrs.ac.grp = &host_attribute_group;
1489         i->t.host_attrs.ac.match = spi_host_match;
1490         transport_container_register(&i->t.host_attrs);
1491         i->t.host_size = sizeof(struct spi_host_attrs);
1492         i->f = ft;
1493
1494         return &i->t;
1495 }
1496 EXPORT_SYMBOL(spi_attach_transport);
1497
1498 void spi_release_transport(struct scsi_transport_template *t)
1499 {
1500         struct spi_internal *i = to_spi_internal(t);
1501
1502         transport_container_unregister(&i->t.target_attrs);
1503         transport_container_unregister(&i->t.host_attrs);
1504
1505         kfree(i);
1506 }
1507 EXPORT_SYMBOL(spi_release_transport);
1508
1509 static __init int spi_transport_init(void)
1510 {
1511         int error = transport_class_register(&spi_transport_class);
1512         if (error)
1513                 return error;
1514         error = anon_transport_class_register(&spi_device_class);
1515         return transport_class_register(&spi_host_class);
1516 }
1517
1518 static void __exit spi_transport_exit(void)
1519 {
1520         transport_class_unregister(&spi_transport_class);
1521         anon_transport_class_unregister(&spi_device_class);
1522         transport_class_unregister(&spi_host_class);
1523 }
1524
1525 MODULE_AUTHOR("Martin Hicks");
1526 MODULE_DESCRIPTION("SPI Transport Attributes");
1527 MODULE_LICENSE("GPL");
1528
1529 module_init(spi_transport_init);
1530 module_exit(spi_transport_exit);