[SCSI] aic79xx: make driver respect nvram for IU and QAS settings
[linux-2.6.git] / drivers / scsi / scsi_transport_spi.c
1 /* 
2  *  Parallel SCSI (SPI) transport specific attributes exported to sysfs.
3  *
4  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
5  *  Copyright (c) 2004, 2005 James Bottomley <James.Bottomley@SteelEye.com>
6  *
7  *  This program is free software; you can redistribute it and/or modify
8  *  it under the terms of the GNU General Public License as published by
9  *  the Free Software Foundation; either version 2 of the License, or
10  *  (at your option) any later version.
11  *
12  *  This program is distributed in the hope that it will be useful,
13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  *  GNU General Public License for more details.
16  *
17  *  You should have received a copy of the GNU General Public License
18  *  along with this program; if not, write to the Free Software
19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20  */
21 #include <linux/ctype.h>
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/workqueue.h>
25 #include <linux/blkdev.h>
26 #include <linux/mutex.h>
27 #include <linux/sysfs.h>
28 #include <scsi/scsi.h>
29 #include "scsi_priv.h"
30 #include <scsi/scsi_device.h>
31 #include <scsi/scsi_host.h>
32 #include <scsi/scsi_cmnd.h>
33 #include <scsi/scsi_eh.h>
34 #include <scsi/scsi_transport.h>
35 #include <scsi/scsi_transport_spi.h>
36
37 #define SPI_NUM_ATTRS 14        /* increase this if you add attributes */
38 #define SPI_OTHER_ATTRS 1       /* Increase this if you add "always
39                                  * on" attributes */
40 #define SPI_HOST_ATTRS  1
41
42 #define SPI_MAX_ECHO_BUFFER_SIZE        4096
43
44 #define DV_LOOPS        3
45 #define DV_TIMEOUT      (10*HZ)
46 #define DV_RETRIES      3       /* should only need at most 
47                                  * two cc/ua clears */
48
49 /* Private data accessors (keep these out of the header file) */
50 #define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress)
51 #define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex)
52
53 struct spi_internal {
54         struct scsi_transport_template t;
55         struct spi_function_template *f;
56 };
57
58 #define to_spi_internal(tmpl)   container_of(tmpl, struct spi_internal, t)
59
60 static const int ppr_to_ps[] = {
61         /* The PPR values 0-6 are reserved, fill them in when
62          * the committee defines them */
63         -1,                     /* 0x00 */
64         -1,                     /* 0x01 */
65         -1,                     /* 0x02 */
66         -1,                     /* 0x03 */
67         -1,                     /* 0x04 */
68         -1,                     /* 0x05 */
69         -1,                     /* 0x06 */
70          3125,                  /* 0x07 */
71          6250,                  /* 0x08 */
72         12500,                  /* 0x09 */
73         25000,                  /* 0x0a */
74         30300,                  /* 0x0b */
75         50000,                  /* 0x0c */
76 };
77 /* The PPR values at which you calculate the period in ns by multiplying
78  * by 4 */
79 #define SPI_STATIC_PPR  0x0c
80
81 static int sprint_frac(char *dest, int value, int denom)
82 {
83         int frac = value % denom;
84         int result = sprintf(dest, "%d", value / denom);
85
86         if (frac == 0)
87                 return result;
88         dest[result++] = '.';
89
90         do {
91                 denom /= 10;
92                 sprintf(dest + result, "%d", frac / denom);
93                 result++;
94                 frac %= denom;
95         } while (frac);
96
97         dest[result++] = '\0';
98         return result;
99 }
100
101 static int spi_execute(struct scsi_device *sdev, const void *cmd,
102                        enum dma_data_direction dir,
103                        void *buffer, unsigned bufflen,
104                        struct scsi_sense_hdr *sshdr)
105 {
106         int i, result;
107         unsigned char sense[SCSI_SENSE_BUFFERSIZE];
108
109         for(i = 0; i < DV_RETRIES; i++) {
110                 result = scsi_execute(sdev, cmd, dir, buffer, bufflen,
111                                       sense, DV_TIMEOUT, /* retries */ 1,
112                                       REQ_FAILFAST_DEV |
113                                       REQ_FAILFAST_TRANSPORT |
114                                       REQ_FAILFAST_DRIVER,
115                                       NULL);
116                 if (driver_byte(result) & DRIVER_SENSE) {
117                         struct scsi_sense_hdr sshdr_tmp;
118                         if (!sshdr)
119                                 sshdr = &sshdr_tmp;
120
121                         if (scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE,
122                                                  sshdr)
123                             && sshdr->sense_key == UNIT_ATTENTION)
124                                 continue;
125                 }
126                 break;
127         }
128         return result;
129 }
130
131 static struct {
132         enum spi_signal_type    value;
133         char                    *name;
134 } signal_types[] = {
135         { SPI_SIGNAL_UNKNOWN, "unknown" },
136         { SPI_SIGNAL_SE, "SE" },
137         { SPI_SIGNAL_LVD, "LVD" },
138         { SPI_SIGNAL_HVD, "HVD" },
139 };
140
141 static inline const char *spi_signal_to_string(enum spi_signal_type type)
142 {
143         int i;
144
145         for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
146                 if (type == signal_types[i].value)
147                         return signal_types[i].name;
148         }
149         return NULL;
150 }
151 static inline enum spi_signal_type spi_signal_to_value(const char *name)
152 {
153         int i, len;
154
155         for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
156                 len =  strlen(signal_types[i].name);
157                 if (strncmp(name, signal_types[i].name, len) == 0 &&
158                     (name[len] == '\n' || name[len] == '\0'))
159                         return signal_types[i].value;
160         }
161         return SPI_SIGNAL_UNKNOWN;
162 }
163
164 static int spi_host_setup(struct transport_container *tc, struct device *dev,
165                           struct device *cdev)
166 {
167         struct Scsi_Host *shost = dev_to_shost(dev);
168
169         spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
170
171         return 0;
172 }
173
174 static int spi_host_configure(struct transport_container *tc,
175                               struct device *dev,
176                               struct device *cdev);
177
178 static DECLARE_TRANSPORT_CLASS(spi_host_class,
179                                "spi_host",
180                                spi_host_setup,
181                                NULL,
182                                spi_host_configure);
183
184 static int spi_host_match(struct attribute_container *cont,
185                           struct device *dev)
186 {
187         struct Scsi_Host *shost;
188
189         if (!scsi_is_host_device(dev))
190                 return 0;
191
192         shost = dev_to_shost(dev);
193         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
194             != &spi_host_class.class)
195                 return 0;
196
197         return &shost->transportt->host_attrs.ac == cont;
198 }
199
200 static int spi_target_configure(struct transport_container *tc,
201                                 struct device *dev,
202                                 struct device *cdev);
203
204 static int spi_device_configure(struct transport_container *tc,
205                                 struct device *dev,
206                                 struct device *cdev)
207 {
208         struct scsi_device *sdev = to_scsi_device(dev);
209         struct scsi_target *starget = sdev->sdev_target;
210
211         /* Populate the target capability fields with the values
212          * gleaned from the device inquiry */
213
214         spi_support_sync(starget) = scsi_device_sync(sdev);
215         spi_support_wide(starget) = scsi_device_wide(sdev);
216         spi_support_dt(starget) = scsi_device_dt(sdev);
217         spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
218         spi_support_ius(starget) = scsi_device_ius(sdev);
219         spi_support_qas(starget) = scsi_device_qas(sdev);
220
221         return 0;
222 }
223
224 static int spi_setup_transport_attrs(struct transport_container *tc,
225                                      struct device *dev,
226                                      struct device *cdev)
227 {
228         struct scsi_target *starget = to_scsi_target(dev);
229
230         spi_period(starget) = -1;       /* illegal value */
231         spi_min_period(starget) = 0;
232         spi_offset(starget) = 0;        /* async */
233         spi_max_offset(starget) = 255;
234         spi_width(starget) = 0; /* narrow */
235         spi_max_width(starget) = 1;
236         spi_iu(starget) = 0;    /* no IU */
237         spi_max_iu(starget) = 1;
238         spi_dt(starget) = 0;    /* ST */
239         spi_qas(starget) = 0;
240         spi_max_qas(starget) = 1;
241         spi_wr_flow(starget) = 0;
242         spi_rd_strm(starget) = 0;
243         spi_rti(starget) = 0;
244         spi_pcomp_en(starget) = 0;
245         spi_hold_mcs(starget) = 0;
246         spi_dv_pending(starget) = 0;
247         spi_dv_in_progress(starget) = 0;
248         spi_initial_dv(starget) = 0;
249         mutex_init(&spi_dv_mutex(starget));
250
251         return 0;
252 }
253
254 #define spi_transport_show_simple(field, format_string)                 \
255                                                                         \
256 static ssize_t                                                          \
257 show_spi_transport_##field(struct device *dev,                  \
258                            struct device_attribute *attr, char *buf)    \
259 {                                                                       \
260         struct scsi_target *starget = transport_class_to_starget(dev);  \
261         struct spi_transport_attrs *tp;                                 \
262                                                                         \
263         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
264         return snprintf(buf, 20, format_string, tp->field);             \
265 }
266
267 #define spi_transport_store_simple(field, format_string)                \
268                                                                         \
269 static ssize_t                                                          \
270 store_spi_transport_##field(struct device *dev,                         \
271                             struct device_attribute *attr,              \
272                             const char *buf, size_t count)              \
273 {                                                                       \
274         int val;                                                        \
275         struct scsi_target *starget = transport_class_to_starget(dev);  \
276         struct spi_transport_attrs *tp;                                 \
277                                                                         \
278         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
279         val = simple_strtoul(buf, NULL, 0);                             \
280         tp->field = val;                                                \
281         return count;                                                   \
282 }
283
284 #define spi_transport_show_function(field, format_string)               \
285                                                                         \
286 static ssize_t                                                          \
287 show_spi_transport_##field(struct device *dev,                  \
288                            struct device_attribute *attr, char *buf)    \
289 {                                                                       \
290         struct scsi_target *starget = transport_class_to_starget(dev);  \
291         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
292         struct spi_transport_attrs *tp;                                 \
293         struct spi_internal *i = to_spi_internal(shost->transportt);    \
294         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
295         if (i->f->get_##field)                                          \
296                 i->f->get_##field(starget);                             \
297         return snprintf(buf, 20, format_string, tp->field);             \
298 }
299
300 #define spi_transport_store_function(field, format_string)              \
301 static ssize_t                                                          \
302 store_spi_transport_##field(struct device *dev,                         \
303                             struct device_attribute *attr,              \
304                             const char *buf, size_t count)              \
305 {                                                                       \
306         int val;                                                        \
307         struct scsi_target *starget = transport_class_to_starget(dev);  \
308         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
309         struct spi_internal *i = to_spi_internal(shost->transportt);    \
310                                                                         \
311         if (!i->f->set_##field)                                         \
312                 return -EINVAL;                                         \
313         val = simple_strtoul(buf, NULL, 0);                             \
314         i->f->set_##field(starget, val);                                \
315         return count;                                                   \
316 }
317
318 #define spi_transport_store_max(field, format_string)                   \
319 static ssize_t                                                          \
320 store_spi_transport_##field(struct device *dev,                         \
321                             struct device_attribute *attr,              \
322                             const char *buf, size_t count)              \
323 {                                                                       \
324         int val;                                                        \
325         struct scsi_target *starget = transport_class_to_starget(dev);  \
326         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
327         struct spi_internal *i = to_spi_internal(shost->transportt);    \
328         struct spi_transport_attrs *tp                                  \
329                 = (struct spi_transport_attrs *)&starget->starget_data; \
330                                                                         \
331         if (i->f->set_##field)                                          \
332                 return -EINVAL;                                         \
333         val = simple_strtoul(buf, NULL, 0);                             \
334         if (val > tp->max_##field)                                      \
335                 val = tp->max_##field;                                  \
336         i->f->set_##field(starget, val);                                \
337         return count;                                                   \
338 }
339
340 #define spi_transport_rd_attr(field, format_string)                     \
341         spi_transport_show_function(field, format_string)               \
342         spi_transport_store_function(field, format_string)              \
343 static DEVICE_ATTR(field, S_IRUGO,                              \
344                    show_spi_transport_##field,                  \
345                    store_spi_transport_##field);
346
347 #define spi_transport_simple_attr(field, format_string)                 \
348         spi_transport_show_simple(field, format_string)                 \
349         spi_transport_store_simple(field, format_string)                \
350 static DEVICE_ATTR(field, S_IRUGO,                              \
351                    show_spi_transport_##field,                  \
352                    store_spi_transport_##field);
353
354 #define spi_transport_max_attr(field, format_string)                    \
355         spi_transport_show_function(field, format_string)               \
356         spi_transport_store_max(field, format_string)                   \
357         spi_transport_simple_attr(max_##field, format_string)           \
358 static DEVICE_ATTR(field, S_IRUGO,                              \
359                    show_spi_transport_##field,                  \
360                    store_spi_transport_##field);
361
362 /* The Parallel SCSI Tranport Attributes: */
363 spi_transport_max_attr(offset, "%d\n");
364 spi_transport_max_attr(width, "%d\n");
365 spi_transport_max_attr(iu, "%d\n");
366 spi_transport_rd_attr(dt, "%d\n");
367 spi_transport_max_attr(qas, "%d\n");
368 spi_transport_rd_attr(wr_flow, "%d\n");
369 spi_transport_rd_attr(rd_strm, "%d\n");
370 spi_transport_rd_attr(rti, "%d\n");
371 spi_transport_rd_attr(pcomp_en, "%d\n");
372 spi_transport_rd_attr(hold_mcs, "%d\n");
373
374 /* we only care about the first child device that's a real SCSI device
375  * so we return 1 to terminate the iteration when we find it */
376 static int child_iter(struct device *dev, void *data)
377 {
378         if (!scsi_is_sdev_device(dev))
379                 return 0;
380
381         spi_dv_device(to_scsi_device(dev));
382         return 1;
383 }
384
385 static ssize_t
386 store_spi_revalidate(struct device *dev, struct device_attribute *attr,
387                      const char *buf, size_t count)
388 {
389         struct scsi_target *starget = transport_class_to_starget(dev);
390
391         device_for_each_child(&starget->dev, NULL, child_iter);
392         return count;
393 }
394 static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
395
396 /* Translate the period into ns according to the current spec
397  * for SDTR/PPR messages */
398 static int period_to_str(char *buf, int period)
399 {
400         int len, picosec;
401
402         if (period < 0 || period > 0xff) {
403                 picosec = -1;
404         } else if (period <= SPI_STATIC_PPR) {
405                 picosec = ppr_to_ps[period];
406         } else {
407                 picosec = period * 4000;
408         }
409
410         if (picosec == -1) {
411                 len = sprintf(buf, "reserved");
412         } else {
413                 len = sprint_frac(buf, picosec, 1000);
414         }
415
416         return len;
417 }
418
419 static ssize_t
420 show_spi_transport_period_helper(char *buf, int period)
421 {
422         int len = period_to_str(buf, period);
423         buf[len++] = '\n';
424         buf[len] = '\0';
425         return len;
426 }
427
428 static ssize_t
429 store_spi_transport_period_helper(struct device *dev, const char *buf,
430                                   size_t count, int *periodp)
431 {
432         int j, picosec, period = -1;
433         char *endp;
434
435         picosec = simple_strtoul(buf, &endp, 10) * 1000;
436         if (*endp == '.') {
437                 int mult = 100;
438                 do {
439                         endp++;
440                         if (!isdigit(*endp))
441                                 break;
442                         picosec += (*endp - '0') * mult;
443                         mult /= 10;
444                 } while (mult > 0);
445         }
446
447         for (j = 0; j <= SPI_STATIC_PPR; j++) {
448                 if (ppr_to_ps[j] < picosec)
449                         continue;
450                 period = j;
451                 break;
452         }
453
454         if (period == -1)
455                 period = picosec / 4000;
456
457         if (period > 0xff)
458                 period = 0xff;
459
460         *periodp = period;
461
462         return count;
463 }
464
465 static ssize_t
466 show_spi_transport_period(struct device *dev,
467                           struct device_attribute *attr, char *buf)
468 {
469         struct scsi_target *starget = transport_class_to_starget(dev);
470         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
471         struct spi_internal *i = to_spi_internal(shost->transportt);
472         struct spi_transport_attrs *tp =
473                 (struct spi_transport_attrs *)&starget->starget_data;
474
475         if (i->f->get_period)
476                 i->f->get_period(starget);
477
478         return show_spi_transport_period_helper(buf, tp->period);
479 }
480
481 static ssize_t
482 store_spi_transport_period(struct device *cdev, struct device_attribute *attr,
483                            const char *buf, size_t count)
484 {
485         struct scsi_target *starget = transport_class_to_starget(cdev);
486         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
487         struct spi_internal *i = to_spi_internal(shost->transportt);
488         struct spi_transport_attrs *tp =
489                 (struct spi_transport_attrs *)&starget->starget_data;
490         int period, retval;
491
492         if (!i->f->set_period)
493                 return -EINVAL;
494
495         retval = store_spi_transport_period_helper(cdev, buf, count, &period);
496
497         if (period < tp->min_period)
498                 period = tp->min_period;
499
500         i->f->set_period(starget, period);
501
502         return retval;
503 }
504
505 static DEVICE_ATTR(period, S_IRUGO,
506                    show_spi_transport_period,
507                    store_spi_transport_period);
508
509 static ssize_t
510 show_spi_transport_min_period(struct device *cdev,
511                               struct device_attribute *attr, char *buf)
512 {
513         struct scsi_target *starget = transport_class_to_starget(cdev);
514         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
515         struct spi_internal *i = to_spi_internal(shost->transportt);
516         struct spi_transport_attrs *tp =
517                 (struct spi_transport_attrs *)&starget->starget_data;
518
519         if (!i->f->set_period)
520                 return -EINVAL;
521
522         return show_spi_transport_period_helper(buf, tp->min_period);
523 }
524
525 static ssize_t
526 store_spi_transport_min_period(struct device *cdev,
527                                struct device_attribute *attr,
528                                const char *buf, size_t count)
529 {
530         struct scsi_target *starget = transport_class_to_starget(cdev);
531         struct spi_transport_attrs *tp =
532                 (struct spi_transport_attrs *)&starget->starget_data;
533
534         return store_spi_transport_period_helper(cdev, buf, count,
535                                                  &tp->min_period);
536 }
537
538
539 static DEVICE_ATTR(min_period, S_IRUGO,
540                    show_spi_transport_min_period,
541                    store_spi_transport_min_period);
542
543
544 static ssize_t show_spi_host_signalling(struct device *cdev,
545                                         struct device_attribute *attr,
546                                         char *buf)
547 {
548         struct Scsi_Host *shost = transport_class_to_shost(cdev);
549         struct spi_internal *i = to_spi_internal(shost->transportt);
550
551         if (i->f->get_signalling)
552                 i->f->get_signalling(shost);
553
554         return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
555 }
556 static ssize_t store_spi_host_signalling(struct device *dev,
557                                          struct device_attribute *attr,
558                                          const char *buf, size_t count)
559 {
560         struct Scsi_Host *shost = transport_class_to_shost(dev);
561         struct spi_internal *i = to_spi_internal(shost->transportt);
562         enum spi_signal_type type = spi_signal_to_value(buf);
563
564         if (!i->f->set_signalling)
565                 return -EINVAL;
566
567         if (type != SPI_SIGNAL_UNKNOWN)
568                 i->f->set_signalling(shost, type);
569
570         return count;
571 }
572 static DEVICE_ATTR(signalling, S_IRUGO,
573                    show_spi_host_signalling,
574                    store_spi_host_signalling);
575
576 #define DV_SET(x, y)                    \
577         if(i->f->set_##x)               \
578                 i->f->set_##x(sdev->sdev_target, y)
579
580 enum spi_compare_returns {
581         SPI_COMPARE_SUCCESS,
582         SPI_COMPARE_FAILURE,
583         SPI_COMPARE_SKIP_TEST,
584 };
585
586
587 /* This is for read/write Domain Validation:  If the device supports
588  * an echo buffer, we do read/write tests to it */
589 static enum spi_compare_returns
590 spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,
591                           u8 *ptr, const int retries)
592 {
593         int len = ptr - buffer;
594         int j, k, r, result;
595         unsigned int pattern = 0x0000ffff;
596         struct scsi_sense_hdr sshdr;
597
598         const char spi_write_buffer[] = {
599                 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
600         };
601         const char spi_read_buffer[] = {
602                 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
603         };
604
605         /* set up the pattern buffer.  Doesn't matter if we spill
606          * slightly beyond since that's where the read buffer is */
607         for (j = 0; j < len; ) {
608
609                 /* fill the buffer with counting (test a) */
610                 for ( ; j < min(len, 32); j++)
611                         buffer[j] = j;
612                 k = j;
613                 /* fill the buffer with alternating words of 0x0 and
614                  * 0xffff (test b) */
615                 for ( ; j < min(len, k + 32); j += 2) {
616                         u16 *word = (u16 *)&buffer[j];
617                         
618                         *word = (j & 0x02) ? 0x0000 : 0xffff;
619                 }
620                 k = j;
621                 /* fill with crosstalk (alternating 0x5555 0xaaa)
622                  * (test c) */
623                 for ( ; j < min(len, k + 32); j += 2) {
624                         u16 *word = (u16 *)&buffer[j];
625
626                         *word = (j & 0x02) ? 0x5555 : 0xaaaa;
627                 }
628                 k = j;
629                 /* fill with shifting bits (test d) */
630                 for ( ; j < min(len, k + 32); j += 4) {
631                         u32 *word = (unsigned int *)&buffer[j];
632                         u32 roll = (pattern & 0x80000000) ? 1 : 0;
633                         
634                         *word = pattern;
635                         pattern = (pattern << 1) | roll;
636                 }
637                 /* don't bother with random data (test e) */
638         }
639
640         for (r = 0; r < retries; r++) {
641                 result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE,
642                                      buffer, len, &sshdr);
643                 if(result || !scsi_device_online(sdev)) {
644
645                         scsi_device_set_state(sdev, SDEV_QUIESCE);
646                         if (scsi_sense_valid(&sshdr)
647                             && sshdr.sense_key == ILLEGAL_REQUEST
648                             /* INVALID FIELD IN CDB */
649                             && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
650                                 /* This would mean that the drive lied
651                                  * to us about supporting an echo
652                                  * buffer (unfortunately some Western
653                                  * Digital drives do precisely this)
654                                  */
655                                 return SPI_COMPARE_SKIP_TEST;
656
657
658                         sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
659                         return SPI_COMPARE_FAILURE;
660                 }
661
662                 memset(ptr, 0, len);
663                 spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE,
664                             ptr, len, NULL);
665                 scsi_device_set_state(sdev, SDEV_QUIESCE);
666
667                 if (memcmp(buffer, ptr, len) != 0)
668                         return SPI_COMPARE_FAILURE;
669         }
670         return SPI_COMPARE_SUCCESS;
671 }
672
673 /* This is for the simplest form of Domain Validation: a read test
674  * on the inquiry data from the device */
675 static enum spi_compare_returns
676 spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,
677                               u8 *ptr, const int retries)
678 {
679         int r, result;
680         const int len = sdev->inquiry_len;
681         const char spi_inquiry[] = {
682                 INQUIRY, 0, 0, 0, len, 0
683         };
684
685         for (r = 0; r < retries; r++) {
686                 memset(ptr, 0, len);
687
688                 result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE,
689                                      ptr, len, NULL);
690                 
691                 if(result || !scsi_device_online(sdev)) {
692                         scsi_device_set_state(sdev, SDEV_QUIESCE);
693                         return SPI_COMPARE_FAILURE;
694                 }
695
696                 /* If we don't have the inquiry data already, the
697                  * first read gets it */
698                 if (ptr == buffer) {
699                         ptr += len;
700                         --r;
701                         continue;
702                 }
703
704                 if (memcmp(buffer, ptr, len) != 0)
705                         /* failure */
706                         return SPI_COMPARE_FAILURE;
707         }
708         return SPI_COMPARE_SUCCESS;
709 }
710
711 static enum spi_compare_returns
712 spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,
713                enum spi_compare_returns 
714                (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
715 {
716         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
717         struct scsi_target *starget = sdev->sdev_target;
718         int period = 0, prevperiod = 0; 
719         enum spi_compare_returns retval;
720
721
722         for (;;) {
723                 int newperiod;
724                 retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
725
726                 if (retval == SPI_COMPARE_SUCCESS
727                     || retval == SPI_COMPARE_SKIP_TEST)
728                         break;
729
730                 /* OK, retrain, fallback */
731                 if (i->f->get_iu)
732                         i->f->get_iu(starget);
733                 if (i->f->get_qas)
734                         i->f->get_qas(starget);
735                 if (i->f->get_period)
736                         i->f->get_period(sdev->sdev_target);
737
738                 /* Here's the fallback sequence; first try turning off
739                  * IU, then QAS (if we can control them), then finally
740                  * fall down the periods */
741                 if (i->f->set_iu && spi_iu(starget)) {
742                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n");
743                         DV_SET(iu, 0);
744                 } else if (i->f->set_qas && spi_qas(starget)) {
745                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n");
746                         DV_SET(qas, 0);
747                 } else {
748                         newperiod = spi_period(starget);
749                         period = newperiod > period ? newperiod : period;
750                         if (period < 0x0d)
751                                 period++;
752                         else
753                                 period += period >> 1;
754
755                         if (unlikely(period > 0xff || period == prevperiod)) {
756                                 /* Total failure; set to async and return */
757                                 starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
758                                 DV_SET(offset, 0);
759                                 return SPI_COMPARE_FAILURE;
760                         }
761                         starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");
762                         DV_SET(period, period);
763                         prevperiod = period;
764                 }
765         }
766         return retval;
767 }
768
769 static int
770 spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)
771 {
772         int l, result;
773
774         /* first off do a test unit ready.  This can error out 
775          * because of reservations or some other reason.  If it
776          * fails, the device won't let us write to the echo buffer
777          * so just return failure */
778         
779         const char spi_test_unit_ready[] = {
780                 TEST_UNIT_READY, 0, 0, 0, 0, 0
781         };
782
783         const char spi_read_buffer_descriptor[] = {
784                 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
785         };
786
787         
788         /* We send a set of three TURs to clear any outstanding 
789          * unit attention conditions if they exist (Otherwise the
790          * buffer tests won't be happy).  If the TUR still fails
791          * (reservation conflict, device not ready, etc) just
792          * skip the write tests */
793         for (l = 0; ; l++) {
794                 result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE, 
795                                      NULL, 0, NULL);
796
797                 if(result) {
798                         if(l >= 3)
799                                 return 0;
800                 } else {
801                         /* TUR succeeded */
802                         break;
803                 }
804         }
805
806         result = spi_execute(sdev, spi_read_buffer_descriptor, 
807                              DMA_FROM_DEVICE, buffer, 4, NULL);
808
809         if (result)
810                 /* Device has no echo buffer */
811                 return 0;
812
813         return buffer[3] + ((buffer[2] & 0x1f) << 8);
814 }
815
816 static void
817 spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
818 {
819         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
820         struct scsi_target *starget = sdev->sdev_target;
821         struct Scsi_Host *shost = sdev->host;
822         int len = sdev->inquiry_len;
823         int min_period = spi_min_period(starget);
824         int max_width = spi_max_width(starget);
825         /* first set us up for narrow async */
826         DV_SET(offset, 0);
827         DV_SET(width, 0);
828
829         if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
830             != SPI_COMPARE_SUCCESS) {
831                 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
832                 /* FIXME: should probably offline the device here? */
833                 return;
834         }
835
836         if (!scsi_device_wide(sdev)) {
837                 spi_max_width(starget) = 0;
838                 max_width = 0;
839         }
840
841         /* test width */
842         if (i->f->set_width && max_width) {
843                 i->f->set_width(starget, 1);
844
845                 if (spi_dv_device_compare_inquiry(sdev, buffer,
846                                                    buffer + len,
847                                                    DV_LOOPS)
848                     != SPI_COMPARE_SUCCESS) {
849                         starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
850                         i->f->set_width(starget, 0);
851                         /* Make sure we don't force wide back on by asking
852                          * for a transfer period that requires it */
853                         max_width = 0;
854                         if (min_period < 10)
855                                 min_period = 10;
856                 }
857         }
858
859         if (!i->f->set_period)
860                 return;
861
862         /* device can't handle synchronous */
863         if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev))
864                 return;
865
866         /* len == -1 is the signal that we need to ascertain the
867          * presence of an echo buffer before trying to use it.  len ==
868          * 0 means we don't have an echo buffer */
869         len = -1;
870
871  retry:
872
873         /* now set up to the maximum */
874         DV_SET(offset, spi_max_offset(starget));
875         DV_SET(period, min_period);
876
877         /* try QAS requests; this should be harmless to set if the
878          * target supports it */
879         if (scsi_device_qas(sdev) && spi_max_qas(starget)) {
880                 DV_SET(qas, 1);
881         } else {
882                 DV_SET(qas, 0);
883         }
884
885         if (scsi_device_ius(sdev) && spi_max_iu(starget) && min_period < 9) {
886                 /* This u320 (or u640). Set IU transfers */
887                 DV_SET(iu, 1);
888                 /* Then set the optional parameters */
889                 DV_SET(rd_strm, 1);
890                 DV_SET(wr_flow, 1);
891                 DV_SET(rti, 1);
892                 if (min_period == 8)
893                         DV_SET(pcomp_en, 1);
894         } else {
895                 DV_SET(iu, 0);
896         }
897
898         /* now that we've done all this, actually check the bus
899          * signal type (if known).  Some devices are stupid on
900          * a SE bus and still claim they can try LVD only settings */
901         if (i->f->get_signalling)
902                 i->f->get_signalling(shost);
903         if (spi_signalling(shost) == SPI_SIGNAL_SE ||
904             spi_signalling(shost) == SPI_SIGNAL_HVD ||
905             !scsi_device_dt(sdev)) {
906                 DV_SET(dt, 0);
907         } else {
908                 DV_SET(dt, 1);
909         }
910         /* set width last because it will pull all the other
911          * parameters down to required values */
912         DV_SET(width, max_width);
913
914         /* Do the read only INQUIRY tests */
915         spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
916                        spi_dv_device_compare_inquiry);
917         /* See if we actually managed to negotiate and sustain DT */
918         if (i->f->get_dt)
919                 i->f->get_dt(starget);
920
921         /* see if the device has an echo buffer.  If it does we can do
922          * the SPI pattern write tests.  Because of some broken
923          * devices, we *only* try this on a device that has actually
924          * negotiated DT */
925
926         if (len == -1 && spi_dt(starget))
927                 len = spi_dv_device_get_echo_buffer(sdev, buffer);
928
929         if (len <= 0) {
930                 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
931                 return;
932         }
933
934         if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
935                 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
936                 len = SPI_MAX_ECHO_BUFFER_SIZE;
937         }
938
939         if (spi_dv_retrain(sdev, buffer, buffer + len,
940                            spi_dv_device_echo_buffer)
941             == SPI_COMPARE_SKIP_TEST) {
942                 /* OK, the stupid drive can't do a write echo buffer
943                  * test after all, fall back to the read tests */
944                 len = 0;
945                 goto retry;
946         }
947 }
948
949
950 /**     spi_dv_device - Do Domain Validation on the device
951  *      @sdev:          scsi device to validate
952  *
953  *      Performs the domain validation on the given device in the
954  *      current execution thread.  Since DV operations may sleep,
955  *      the current thread must have user context.  Also no SCSI
956  *      related locks that would deadlock I/O issued by the DV may
957  *      be held.
958  */
959 void
960 spi_dv_device(struct scsi_device *sdev)
961 {
962         struct scsi_target *starget = sdev->sdev_target;
963         u8 *buffer;
964         const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
965
966         if (unlikely(scsi_device_get(sdev)))
967                 return;
968
969         if (unlikely(spi_dv_in_progress(starget)))
970                 return;
971         spi_dv_in_progress(starget) = 1;
972
973         buffer = kzalloc(len, GFP_KERNEL);
974
975         if (unlikely(!buffer))
976                 goto out_put;
977
978         /* We need to verify that the actual device will quiesce; the
979          * later target quiesce is just a nice to have */
980         if (unlikely(scsi_device_quiesce(sdev)))
981                 goto out_free;
982
983         scsi_target_quiesce(starget);
984
985         spi_dv_pending(starget) = 1;
986         mutex_lock(&spi_dv_mutex(starget));
987
988         starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
989
990         spi_dv_device_internal(sdev, buffer);
991
992         starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
993
994         mutex_unlock(&spi_dv_mutex(starget));
995         spi_dv_pending(starget) = 0;
996
997         scsi_target_resume(starget);
998
999         spi_initial_dv(starget) = 1;
1000
1001  out_free:
1002         kfree(buffer);
1003  out_put:
1004         spi_dv_in_progress(starget) = 0;
1005         scsi_device_put(sdev);
1006 }
1007 EXPORT_SYMBOL(spi_dv_device);
1008
1009 struct work_queue_wrapper {
1010         struct work_struct      work;
1011         struct scsi_device      *sdev;
1012 };
1013
1014 static void
1015 spi_dv_device_work_wrapper(struct work_struct *work)
1016 {
1017         struct work_queue_wrapper *wqw =
1018                 container_of(work, struct work_queue_wrapper, work);
1019         struct scsi_device *sdev = wqw->sdev;
1020
1021         kfree(wqw);
1022         spi_dv_device(sdev);
1023         spi_dv_pending(sdev->sdev_target) = 0;
1024         scsi_device_put(sdev);
1025 }
1026
1027
1028 /**
1029  *      spi_schedule_dv_device - schedule domain validation to occur on the device
1030  *      @sdev:  The device to validate
1031  *
1032  *      Identical to spi_dv_device() above, except that the DV will be
1033  *      scheduled to occur in a workqueue later.  All memory allocations
1034  *      are atomic, so may be called from any context including those holding
1035  *      SCSI locks.
1036  */
1037 void
1038 spi_schedule_dv_device(struct scsi_device *sdev)
1039 {
1040         struct work_queue_wrapper *wqw =
1041                 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
1042
1043         if (unlikely(!wqw))
1044                 return;
1045
1046         if (unlikely(spi_dv_pending(sdev->sdev_target))) {
1047                 kfree(wqw);
1048                 return;
1049         }
1050         /* Set pending early (dv_device doesn't check it, only sets it) */
1051         spi_dv_pending(sdev->sdev_target) = 1;
1052         if (unlikely(scsi_device_get(sdev))) {
1053                 kfree(wqw);
1054                 spi_dv_pending(sdev->sdev_target) = 0;
1055                 return;
1056         }
1057
1058         INIT_WORK(&wqw->work, spi_dv_device_work_wrapper);
1059         wqw->sdev = sdev;
1060
1061         schedule_work(&wqw->work);
1062 }
1063 EXPORT_SYMBOL(spi_schedule_dv_device);
1064
1065 /**
1066  * spi_display_xfer_agreement - Print the current target transfer agreement
1067  * @starget: The target for which to display the agreement
1068  *
1069  * Each SPI port is required to maintain a transfer agreement for each
1070  * other port on the bus.  This function prints a one-line summary of
1071  * the current agreement; more detailed information is available in sysfs.
1072  */
1073 void spi_display_xfer_agreement(struct scsi_target *starget)
1074 {
1075         struct spi_transport_attrs *tp;
1076         tp = (struct spi_transport_attrs *)&starget->starget_data;
1077
1078         if (tp->offset > 0 && tp->period > 0) {
1079                 unsigned int picosec, kb100;
1080                 char *scsi = "FAST-?";
1081                 char tmp[8];
1082
1083                 if (tp->period <= SPI_STATIC_PPR) {
1084                         picosec = ppr_to_ps[tp->period];
1085                         switch (tp->period) {
1086                                 case  7: scsi = "FAST-320"; break;
1087                                 case  8: scsi = "FAST-160"; break;
1088                                 case  9: scsi = "FAST-80"; break;
1089                                 case 10:
1090                                 case 11: scsi = "FAST-40"; break;
1091                                 case 12: scsi = "FAST-20"; break;
1092                         }
1093                 } else {
1094                         picosec = tp->period * 4000;
1095                         if (tp->period < 25)
1096                                 scsi = "FAST-20";
1097                         else if (tp->period < 50)
1098                                 scsi = "FAST-10";
1099                         else
1100                                 scsi = "FAST-5";
1101                 }
1102
1103                 kb100 = (10000000 + picosec / 2) / picosec;
1104                 if (tp->width)
1105                         kb100 *= 2;
1106                 sprint_frac(tmp, picosec, 1000);
1107
1108                 dev_info(&starget->dev,
1109                          "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1110                          scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1111                          tp->dt ? "DT" : "ST",
1112                          tp->iu ? " IU" : "",
1113                          tp->qas  ? " QAS" : "",
1114                          tp->rd_strm ? " RDSTRM" : "",
1115                          tp->rti ? " RTI" : "",
1116                          tp->wr_flow ? " WRFLOW" : "",
1117                          tp->pcomp_en ? " PCOMP" : "",
1118                          tp->hold_mcs ? " HMCS" : "",
1119                          tmp, tp->offset);
1120         } else {
1121                 dev_info(&starget->dev, "%sasynchronous\n",
1122                                 tp->width ? "wide " : "");
1123         }
1124 }
1125 EXPORT_SYMBOL(spi_display_xfer_agreement);
1126
1127 int spi_populate_width_msg(unsigned char *msg, int width)
1128 {
1129         msg[0] = EXTENDED_MESSAGE;
1130         msg[1] = 2;
1131         msg[2] = EXTENDED_WDTR;
1132         msg[3] = width;
1133         return 4;
1134 }
1135 EXPORT_SYMBOL_GPL(spi_populate_width_msg);
1136
1137 int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
1138 {
1139         msg[0] = EXTENDED_MESSAGE;
1140         msg[1] = 3;
1141         msg[2] = EXTENDED_SDTR;
1142         msg[3] = period;
1143         msg[4] = offset;
1144         return 5;
1145 }
1146 EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
1147
1148 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
1149                 int width, int options)
1150 {
1151         msg[0] = EXTENDED_MESSAGE;
1152         msg[1] = 6;
1153         msg[2] = EXTENDED_PPR;
1154         msg[3] = period;
1155         msg[4] = 0;
1156         msg[5] = offset;
1157         msg[6] = width;
1158         msg[7] = options;
1159         return 8;
1160 }
1161 EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
1162
1163 #ifdef CONFIG_SCSI_CONSTANTS
1164 static const char * const one_byte_msgs[] = {
1165 /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",
1166 /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error", 
1167 /* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",
1168 /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1169 /* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set", 
1170 /* 0x0f */ "Initiate Recovery", "Release Recovery",
1171 /* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",
1172 /* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"
1173 };
1174
1175 static const char * const two_byte_msgs[] = {
1176 /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
1177 /* 0x23 */ "Ignore Wide Residue", "ACA"
1178 };
1179
1180 static const char * const extended_msgs[] = {
1181 /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1182 /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",
1183 /* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"
1184 };
1185
1186 static void print_nego(const unsigned char *msg, int per, int off, int width)
1187 {
1188         if (per) {
1189                 char buf[20];
1190                 period_to_str(buf, msg[per]);
1191                 printk("period = %s ns ", buf);
1192         }
1193
1194         if (off)
1195                 printk("offset = %d ", msg[off]);
1196         if (width)
1197                 printk("width = %d ", 8 << msg[width]);
1198 }
1199
1200 static void print_ptr(const unsigned char *msg, int msb, const char *desc)
1201 {
1202         int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |
1203                         msg[msb+3];
1204         printk("%s = %d ", desc, ptr);
1205 }
1206
1207 int spi_print_msg(const unsigned char *msg)
1208 {
1209         int len = 1, i;
1210         if (msg[0] == EXTENDED_MESSAGE) {
1211                 len = 2 + msg[1];
1212                 if (len == 2)
1213                         len += 256;
1214                 if (msg[2] < ARRAY_SIZE(extended_msgs))
1215                         printk ("%s ", extended_msgs[msg[2]]); 
1216                 else 
1217                         printk ("Extended Message, reserved code (0x%02x) ",
1218                                 (int) msg[2]);
1219                 switch (msg[2]) {
1220                 case EXTENDED_MODIFY_DATA_POINTER:
1221                         print_ptr(msg, 3, "pointer");
1222                         break;
1223                 case EXTENDED_SDTR:
1224                         print_nego(msg, 3, 4, 0);
1225                         break;
1226                 case EXTENDED_WDTR:
1227                         print_nego(msg, 0, 0, 3);
1228                         break;
1229                 case EXTENDED_PPR:
1230                         print_nego(msg, 3, 5, 6);
1231                         break;
1232                 case EXTENDED_MODIFY_BIDI_DATA_PTR:
1233                         print_ptr(msg, 3, "out");
1234                         print_ptr(msg, 7, "in");
1235                         break;
1236                 default:
1237                 for (i = 2; i < len; ++i) 
1238                         printk("%02x ", msg[i]);
1239                 }
1240         /* Identify */
1241         } else if (msg[0] & 0x80) {
1242                 printk("Identify disconnect %sallowed %s %d ",
1243                         (msg[0] & 0x40) ? "" : "not ",
1244                         (msg[0] & 0x20) ? "target routine" : "lun",
1245                         msg[0] & 0x7);
1246         /* Normal One byte */
1247         } else if (msg[0] < 0x1f) {
1248                 if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])
1249                         printk("%s ", one_byte_msgs[msg[0]]);
1250                 else
1251                         printk("reserved (%02x) ", msg[0]);
1252         } else if (msg[0] == 0x55) {
1253                 printk("QAS Request ");
1254         /* Two byte */
1255         } else if (msg[0] <= 0x2f) {
1256                 if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))
1257                         printk("%s %02x ", two_byte_msgs[msg[0] - 0x20], 
1258                                 msg[1]);
1259                 else 
1260                         printk("reserved two byte (%02x %02x) ", 
1261                                 msg[0], msg[1]);
1262                 len = 2;
1263         } else 
1264                 printk("reserved ");
1265         return len;
1266 }
1267 EXPORT_SYMBOL(spi_print_msg);
1268
1269 #else  /* ifndef CONFIG_SCSI_CONSTANTS */
1270
1271 int spi_print_msg(const unsigned char *msg)
1272 {
1273         int len = 1, i;
1274
1275         if (msg[0] == EXTENDED_MESSAGE) {
1276                 len = 2 + msg[1];
1277                 if (len == 2)
1278                         len += 256;
1279                 for (i = 0; i < len; ++i)
1280                         printk("%02x ", msg[i]);
1281         /* Identify */
1282         } else if (msg[0] & 0x80) {
1283                 printk("%02x ", msg[0]);
1284         /* Normal One byte */
1285         } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {
1286                 printk("%02x ", msg[0]);
1287         /* Two byte */
1288         } else if (msg[0] <= 0x2f) {
1289                 printk("%02x %02x", msg[0], msg[1]);
1290                 len = 2;
1291         } else 
1292                 printk("%02x ", msg[0]);
1293         return len;
1294 }
1295 EXPORT_SYMBOL(spi_print_msg);
1296 #endif /* ! CONFIG_SCSI_CONSTANTS */
1297
1298 static int spi_device_match(struct attribute_container *cont,
1299                             struct device *dev)
1300 {
1301         struct scsi_device *sdev;
1302         struct Scsi_Host *shost;
1303         struct spi_internal *i;
1304
1305         if (!scsi_is_sdev_device(dev))
1306                 return 0;
1307
1308         sdev = to_scsi_device(dev);
1309         shost = sdev->host;
1310         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1311             != &spi_host_class.class)
1312                 return 0;
1313         /* Note: this class has no device attributes, so it has
1314          * no per-HBA allocation and thus we don't need to distinguish
1315          * the attribute containers for the device */
1316         i = to_spi_internal(shost->transportt);
1317         if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1318                 return 0;
1319         return 1;
1320 }
1321
1322 static int spi_target_match(struct attribute_container *cont,
1323                             struct device *dev)
1324 {
1325         struct Scsi_Host *shost;
1326         struct scsi_target *starget;
1327         struct spi_internal *i;
1328
1329         if (!scsi_is_target_device(dev))
1330                 return 0;
1331
1332         shost = dev_to_shost(dev->parent);
1333         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1334             != &spi_host_class.class)
1335                 return 0;
1336
1337         i = to_spi_internal(shost->transportt);
1338         starget = to_scsi_target(dev);
1339
1340         if (i->f->deny_binding && i->f->deny_binding(starget))
1341                 return 0;
1342
1343         return &i->t.target_attrs.ac == cont;
1344 }
1345
1346 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1347                                "spi_transport",
1348                                spi_setup_transport_attrs,
1349                                NULL,
1350                                spi_target_configure);
1351
1352 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1353                                     spi_device_match,
1354                                     spi_device_configure);
1355
1356 static struct attribute *host_attributes[] = {
1357         &dev_attr_signalling.attr,
1358         NULL
1359 };
1360
1361 static struct attribute_group host_attribute_group = {
1362         .attrs = host_attributes,
1363 };
1364
1365 static int spi_host_configure(struct transport_container *tc,
1366                               struct device *dev,
1367                               struct device *cdev)
1368 {
1369         struct kobject *kobj = &cdev->kobj;
1370         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1371         struct spi_internal *si = to_spi_internal(shost->transportt);
1372         struct attribute *attr = &dev_attr_signalling.attr;
1373         int rc = 0;
1374
1375         if (si->f->set_signalling)
1376                 rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR);
1377
1378         return rc;
1379 }
1380
1381 /* returns true if we should be showing the variable.  Also
1382  * overloads the return by setting 1<<1 if the attribute should
1383  * be writeable */
1384 #define TARGET_ATTRIBUTE_HELPER(name) \
1385         (si->f->show_##name ? S_IRUGO : 0) | \
1386         (si->f->set_##name ? S_IWUSR : 0)
1387
1388 static mode_t target_attribute_is_visible(struct kobject *kobj,
1389                                           struct attribute *attr, int i)
1390 {
1391         struct device *cdev = container_of(kobj, struct device, kobj);
1392         struct scsi_target *starget = transport_class_to_starget(cdev);
1393         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1394         struct spi_internal *si = to_spi_internal(shost->transportt);
1395
1396         if (attr == &dev_attr_period.attr &&
1397             spi_support_sync(starget))
1398                 return TARGET_ATTRIBUTE_HELPER(period);
1399         else if (attr == &dev_attr_min_period.attr &&
1400                  spi_support_sync(starget))
1401                 return TARGET_ATTRIBUTE_HELPER(period);
1402         else if (attr == &dev_attr_offset.attr &&
1403                  spi_support_sync(starget))
1404                 return TARGET_ATTRIBUTE_HELPER(offset);
1405         else if (attr == &dev_attr_max_offset.attr &&
1406                  spi_support_sync(starget))
1407                 return TARGET_ATTRIBUTE_HELPER(offset);
1408         else if (attr == &dev_attr_width.attr &&
1409                  spi_support_wide(starget))
1410                 return TARGET_ATTRIBUTE_HELPER(width);
1411         else if (attr == &dev_attr_max_width.attr &&
1412                  spi_support_wide(starget))
1413                 return TARGET_ATTRIBUTE_HELPER(width);
1414         else if (attr == &dev_attr_iu.attr &&
1415                  spi_support_ius(starget))
1416                 return TARGET_ATTRIBUTE_HELPER(iu);
1417         else if (attr == &dev_attr_max_iu.attr &&
1418                  spi_support_ius(starget))
1419                 return TARGET_ATTRIBUTE_HELPER(iu);
1420         else if (attr == &dev_attr_dt.attr &&
1421                  spi_support_dt(starget))
1422                 return TARGET_ATTRIBUTE_HELPER(dt);
1423         else if (attr == &dev_attr_qas.attr &&
1424                  spi_support_qas(starget))
1425                 return TARGET_ATTRIBUTE_HELPER(qas);
1426         else if (attr == &dev_attr_max_qas.attr &&
1427                  spi_support_qas(starget))
1428                 return TARGET_ATTRIBUTE_HELPER(qas);
1429         else if (attr == &dev_attr_wr_flow.attr &&
1430                  spi_support_ius(starget))
1431                 return TARGET_ATTRIBUTE_HELPER(wr_flow);
1432         else if (attr == &dev_attr_rd_strm.attr &&
1433                  spi_support_ius(starget))
1434                 return TARGET_ATTRIBUTE_HELPER(rd_strm);
1435         else if (attr == &dev_attr_rti.attr &&
1436                  spi_support_ius(starget))
1437                 return TARGET_ATTRIBUTE_HELPER(rti);
1438         else if (attr == &dev_attr_pcomp_en.attr &&
1439                  spi_support_ius(starget))
1440                 return TARGET_ATTRIBUTE_HELPER(pcomp_en);
1441         else if (attr == &dev_attr_hold_mcs.attr &&
1442                  spi_support_ius(starget))
1443                 return TARGET_ATTRIBUTE_HELPER(hold_mcs);
1444         else if (attr == &dev_attr_revalidate.attr)
1445                 return S_IWUSR;
1446
1447         return 0;
1448 }
1449
1450 static struct attribute *target_attributes[] = {
1451         &dev_attr_period.attr,
1452         &dev_attr_min_period.attr,
1453         &dev_attr_offset.attr,
1454         &dev_attr_max_offset.attr,
1455         &dev_attr_width.attr,
1456         &dev_attr_max_width.attr,
1457         &dev_attr_iu.attr,
1458         &dev_attr_max_iu.attr,
1459         &dev_attr_dt.attr,
1460         &dev_attr_qas.attr,
1461         &dev_attr_max_qas.attr,
1462         &dev_attr_wr_flow.attr,
1463         &dev_attr_rd_strm.attr,
1464         &dev_attr_rti.attr,
1465         &dev_attr_pcomp_en.attr,
1466         &dev_attr_hold_mcs.attr,
1467         &dev_attr_revalidate.attr,
1468         NULL
1469 };
1470
1471 static struct attribute_group target_attribute_group = {
1472         .attrs = target_attributes,
1473         .is_visible = target_attribute_is_visible,
1474 };
1475
1476 static int spi_target_configure(struct transport_container *tc,
1477                                 struct device *dev,
1478                                 struct device *cdev)
1479 {
1480         struct kobject *kobj = &cdev->kobj;
1481
1482         /* force an update based on parameters read from the device */
1483         sysfs_update_group(kobj, &target_attribute_group);
1484
1485         return 0;
1486 }
1487
1488 struct scsi_transport_template *
1489 spi_attach_transport(struct spi_function_template *ft)
1490 {
1491         struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
1492                                          GFP_KERNEL);
1493
1494         if (unlikely(!i))
1495                 return NULL;
1496
1497         i->t.target_attrs.ac.class = &spi_transport_class.class;
1498         i->t.target_attrs.ac.grp = &target_attribute_group;
1499         i->t.target_attrs.ac.match = spi_target_match;
1500         transport_container_register(&i->t.target_attrs);
1501         i->t.target_size = sizeof(struct spi_transport_attrs);
1502         i->t.host_attrs.ac.class = &spi_host_class.class;
1503         i->t.host_attrs.ac.grp = &host_attribute_group;
1504         i->t.host_attrs.ac.match = spi_host_match;
1505         transport_container_register(&i->t.host_attrs);
1506         i->t.host_size = sizeof(struct spi_host_attrs);
1507         i->f = ft;
1508
1509         return &i->t;
1510 }
1511 EXPORT_SYMBOL(spi_attach_transport);
1512
1513 void spi_release_transport(struct scsi_transport_template *t)
1514 {
1515         struct spi_internal *i = to_spi_internal(t);
1516
1517         transport_container_unregister(&i->t.target_attrs);
1518         transport_container_unregister(&i->t.host_attrs);
1519
1520         kfree(i);
1521 }
1522 EXPORT_SYMBOL(spi_release_transport);
1523
1524 static __init int spi_transport_init(void)
1525 {
1526         int error = transport_class_register(&spi_transport_class);
1527         if (error)
1528                 return error;
1529         error = anon_transport_class_register(&spi_device_class);
1530         return transport_class_register(&spi_host_class);
1531 }
1532
1533 static void __exit spi_transport_exit(void)
1534 {
1535         transport_class_unregister(&spi_transport_class);
1536         anon_transport_class_unregister(&spi_device_class);
1537         transport_class_unregister(&spi_host_class);
1538 }
1539
1540 MODULE_AUTHOR("Martin Hicks");
1541 MODULE_DESCRIPTION("SPI Transport Attributes");
1542 MODULE_LICENSE("GPL");
1543
1544 module_init(spi_transport_init);
1545 module_exit(spi_transport_exit);