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