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fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / drivers / scsi / scsi_transport_spi.c
blob4df21c92ff1ede9931772f36ec7aa3ac77255bb9
1 /*
2 * Parallel SCSI (SPI) transport specific attributes exported to sysfs.
3 *
4 * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
5 * Copyright (c) 2004, 2005 James Bottomley <James.Bottomley@SteelEye.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/ctype.h>
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/workqueue.h>
25 #include <linux/blkdev.h>
26 #include <linux/mutex.h>
27 #include <scsi/scsi.h>
28 #include "scsi_priv.h"
29 #include <scsi/scsi_device.h>
30 #include <scsi/scsi_host.h>
31 #include <scsi/scsi_cmnd.h>
32 #include <scsi/scsi_eh.h>
33 #include <scsi/scsi_transport.h>
34 #include <scsi/scsi_transport_spi.h>
35
36 #define SPI_NUM_ATTRS 14 /* increase this if you add attributes */
37 #define SPI_OTHER_ATTRS 1 /* Increase this if you add "always
38 * on" attributes */
39 #define SPI_HOST_ATTRS 1
40
41 #define SPI_MAX_ECHO_BUFFER_SIZE 4096
42
43 #define DV_LOOPS 3
44 #define DV_TIMEOUT (10*HZ)
45 #define DV_RETRIES 3 /* should only need at most
46 * two cc/ua clears */
47
48 /* Private data accessors (keep these out of the header file) */
49 #define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress)
50 #define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex)
51
52 struct spi_internal {
53 struct scsi_transport_template t;
54 struct spi_function_template *f;
55 /* The actual attributes */
56 struct class_device_attribute private_attrs[SPI_NUM_ATTRS];
57 /* The array of null terminated pointers to attributes
58 * needed by scsi_sysfs.c */
59 struct class_device_attribute *attrs[SPI_NUM_ATTRS + SPI_OTHER_ATTRS + 1];
60 struct class_device_attribute private_host_attrs[SPI_HOST_ATTRS];
61 struct class_device_attribute *host_attrs[SPI_HOST_ATTRS + 1];
62 };
63
64 #define to_spi_internal(tmpl) container_of(tmpl, struct spi_internal, t)
65
66 static const int ppr_to_ps[] = {
67 /* The PPR values 0-6 are reserved, fill them in when
68 * the committee defines them */
69 -1, /* 0x00 */
70 -1, /* 0x01 */
71 -1, /* 0x02 */
72 -1, /* 0x03 */
73 -1, /* 0x04 */
74 -1, /* 0x05 */
75 -1, /* 0x06 */
76 3125, /* 0x07 */
77 6250, /* 0x08 */
78 12500, /* 0x09 */
79 25000, /* 0x0a */
80 30300, /* 0x0b */
81 50000, /* 0x0c */
82 };
83 /* The PPR values at which you calculate the period in ns by multiplying
84 * by 4 */
85 #define SPI_STATIC_PPR 0x0c
86
87 static int sprint_frac(char *dest, int value, int denom)
88 {
89 int frac = value % denom;
90 int result = sprintf(dest, "%d", value / denom);
91
92 if (frac == 0)
93 return result;
94 dest[result++] = '.';
95
96 do {
97 denom /= 10;
98 sprintf(dest + result, "%d", frac / denom);
99 result++;
100 frac %= denom;
101 } while (frac);
102
103 dest[result++] = '\0';
104 return result;
105 }
106
107 static int spi_execute(struct scsi_device *sdev, const void *cmd,
108 enum dma_data_direction dir,
109 void *buffer, unsigned bufflen,
110 struct scsi_sense_hdr *sshdr)
111 {
112 int i, result;
113 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
114
115 for(i = 0; i < DV_RETRIES; i++) {
116 result = scsi_execute(sdev, cmd, dir, buffer, bufflen,
117 sense, DV_TIMEOUT, /* retries */ 1,
118 REQ_FAILFAST);
119 if (result & DRIVER_SENSE) {
120 struct scsi_sense_hdr sshdr_tmp;
121 if (!sshdr)
122 sshdr = &sshdr_tmp;
123
124 if (scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE,
125 sshdr)
126 && sshdr->sense_key == UNIT_ATTENTION)
127 continue;
128 }
129 break;
130 }
131 return result;
132 }
133
134 static struct {
135 enum spi_signal_type value;
136 char *name;
137 } signal_types[] = {
138 { SPI_SIGNAL_UNKNOWN, "unknown" },
139 { SPI_SIGNAL_SE, "SE" },
140 { SPI_SIGNAL_LVD, "LVD" },
141 { SPI_SIGNAL_HVD, "HVD" },
142 };
143
144 static inline const char *spi_signal_to_string(enum spi_signal_type type)
145 {
146 int i;
147
148 for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
149 if (type == signal_types[i].value)
150 return signal_types[i].name;
151 }
152 return NULL;
153 }
154 static inline enum spi_signal_type spi_signal_to_value(const char *name)
155 {
156 int i, len;
157
158 for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
159 len = strlen(signal_types[i].name);
160 if (strncmp(name, signal_types[i].name, len) == 0 &&
161 (name[len] == '\n' || name[len] == '\0'))
162 return signal_types[i].value;
163 }
164 return SPI_SIGNAL_UNKNOWN;
165 }
166
167 static int spi_host_setup(struct transport_container *tc, struct device *dev,
168 struct class_device *cdev)
169 {
170 struct Scsi_Host *shost = dev_to_shost(dev);
171
172 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
173
174 return 0;
175 }
176
177 static DECLARE_TRANSPORT_CLASS(spi_host_class,
178 "spi_host",
179 spi_host_setup,
180 NULL,
181 NULL);
182
183 static int spi_host_match(struct attribute_container *cont,
184 struct device *dev)
185 {
186 struct Scsi_Host *shost;
187 struct spi_internal *i;
188
189 if (!scsi_is_host_device(dev))
190 return 0;
191
192 shost = dev_to_shost(dev);
193 if (!shost->transportt || shost->transportt->host_attrs.ac.class
194 != &spi_host_class.class)
195 return 0;
196
197 i = to_spi_internal(shost->transportt);
198
199 return &i->t.host_attrs.ac == cont;
200 }
201
202 static int spi_device_configure(struct transport_container *tc,
203 struct device *dev,
204 struct class_device *cdev)
205 {
206 struct scsi_device *sdev = to_scsi_device(dev);
207 struct scsi_target *starget = sdev->sdev_target;
208
209 /* Populate the target capability fields with the values
210 * gleaned from the device inquiry */
211
212 spi_support_sync(starget) = scsi_device_sync(sdev);
213 spi_support_wide(starget) = scsi_device_wide(sdev);
214 spi_support_dt(starget) = scsi_device_dt(sdev);
215 spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
216 spi_support_ius(starget) = scsi_device_ius(sdev);
217 spi_support_qas(starget) = scsi_device_qas(sdev);
218
219 return 0;
220 }
221
222 static int spi_setup_transport_attrs(struct transport_container *tc,
223 struct device *dev,
224 struct class_device *cdev)
225 {
226 struct scsi_target *starget = to_scsi_target(dev);
227
228 spi_period(starget) = -1; /* illegal value */
229 spi_min_period(starget) = 0;
230 spi_offset(starget) = 0; /* async */
231 spi_max_offset(starget) = 255;
232 spi_width(starget) = 0; /* narrow */
233 spi_max_width(starget) = 1;
234 spi_iu(starget) = 0; /* no IU */
235 spi_dt(starget) = 0; /* ST */
236 spi_qas(starget) = 0;
237 spi_wr_flow(starget) = 0;
238 spi_rd_strm(starget) = 0;
239 spi_rti(starget) = 0;
240 spi_pcomp_en(starget) = 0;
241 spi_hold_mcs(starget) = 0;
242 spi_dv_pending(starget) = 0;
243 spi_dv_in_progress(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 struct Scsi_Host *shost = sdev->host;
789 int len = sdev->inquiry_len;
790 int min_period = spi_min_period(starget);
791 int max_width = spi_max_width(starget);
792 /* first set us up for narrow async */
793 DV_SET(offset, 0);
794 DV_SET(width, 0);
795
796 if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
797 != SPI_COMPARE_SUCCESS) {
798 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
799 /* FIXME: should probably offline the device here? */
800 return;
801 }
802
803 if (!scsi_device_wide(sdev)) {
804 spi_max_width(starget) = 0;
805 max_width = 0;
806 }
807
808 /* test width */
809 if (i->f->set_width && max_width) {
810 i->f->set_width(starget, 1);
811
812 if (spi_dv_device_compare_inquiry(sdev, buffer,
813 buffer + len,
814 DV_LOOPS)
815 != SPI_COMPARE_SUCCESS) {
816 starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
817 i->f->set_width(starget, 0);
818 /* Make sure we don't force wide back on by asking
819 * for a transfer period that requires it */
820 max_width = 0;
821 if (min_period < 10)
822 min_period = 10;
823 }
824 }
825
826 if (!i->f->set_period)
827 return;
828
829 /* device can't handle synchronous */
830 if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev))
831 return;
832
833 /* len == -1 is the signal that we need to ascertain the
834 * presence of an echo buffer before trying to use it. len ==
835 * 0 means we don't have an echo buffer */
836 len = -1;
837
838 retry:
839
840 /* now set up to the maximum */
841 DV_SET(offset, spi_max_offset(starget));
842 DV_SET(period, min_period);
843
844 /* try QAS requests; this should be harmless to set if the
845 * target supports it */
846 if (scsi_device_qas(sdev)) {
847 DV_SET(qas, 1);
848 } else {
849 DV_SET(qas, 0);
850 }
851
852 if (scsi_device_ius(sdev) && min_period < 9) {
853 /* This u320 (or u640). Set IU transfers */
854 DV_SET(iu, 1);
855 /* Then set the optional parameters */
856 DV_SET(rd_strm, 1);
857 DV_SET(wr_flow, 1);
858 DV_SET(rti, 1);
859 if (min_period == 8)
860 DV_SET(pcomp_en, 1);
861 } else {
862 DV_SET(iu, 0);
863 }
864
865 /* now that we've done all this, actually check the bus
866 * signal type (if known). Some devices are stupid on
867 * a SE bus and still claim they can try LVD only settings */
868 if (i->f->get_signalling)
869 i->f->get_signalling(shost);
870 if (spi_signalling(shost) == SPI_SIGNAL_SE ||
871 spi_signalling(shost) == SPI_SIGNAL_HVD ||
872 !scsi_device_dt(sdev)) {
873 DV_SET(dt, 0);
874 } else {
875 DV_SET(dt, 1);
876 }
877 /* set width last because it will pull all the other
878 * parameters down to required values */
879 DV_SET(width, max_width);
880
881 /* Do the read only INQUIRY tests */
882 spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
883 spi_dv_device_compare_inquiry);
884 /* See if we actually managed to negotiate and sustain DT */
885 if (i->f->get_dt)
886 i->f->get_dt(starget);
887
888 /* see if the device has an echo buffer. If it does we can do
889 * the SPI pattern write tests. Because of some broken
890 * devices, we *only* try this on a device that has actually
891 * negotiated DT */
892
893 if (len == -1 && spi_dt(starget))
894 len = spi_dv_device_get_echo_buffer(sdev, buffer);
895
896 if (len <= 0) {
897 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
898 return;
899 }
900
901 if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
902 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
903 len = SPI_MAX_ECHO_BUFFER_SIZE;
904 }
905
906 if (spi_dv_retrain(sdev, buffer, buffer + len,
907 spi_dv_device_echo_buffer)
908 == SPI_COMPARE_SKIP_TEST) {
909 /* OK, the stupid drive can't do a write echo buffer
910 * test after all, fall back to the read tests */
911 len = 0;
912 goto retry;
913 }
914 }
915
916
917 /** spi_dv_device - Do Domain Validation on the device
918 * @sdev: scsi device to validate
919 *
920 * Performs the domain validation on the given device in the
921 * current execution thread. Since DV operations may sleep,
922 * the current thread must have user context. Also no SCSI
923 * related locks that would deadlock I/O issued by the DV may
924 * be held.
925 */
926 void
927 spi_dv_device(struct scsi_device *sdev)
928 {
929 struct scsi_target *starget = sdev->sdev_target;
930 u8 *buffer;
931 const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
932
933 if (unlikely(scsi_device_get(sdev)))
934 return;
935
936 if (unlikely(spi_dv_in_progress(starget)))
937 return;
938 spi_dv_in_progress(starget) = 1;
939
940 buffer = kzalloc(len, GFP_KERNEL);
941
942 if (unlikely(!buffer))
943 goto out_put;
944
945 /* We need to verify that the actual device will quiesce; the
946 * later target quiesce is just a nice to have */
947 if (unlikely(scsi_device_quiesce(sdev)))
948 goto out_free;
949
950 scsi_target_quiesce(starget);
951
952 spi_dv_pending(starget) = 1;
953 mutex_lock(&spi_dv_mutex(starget));
954
955 starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
956
957 spi_dv_device_internal(sdev, buffer);
958
959 starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
960
961 mutex_unlock(&spi_dv_mutex(starget));
962 spi_dv_pending(starget) = 0;
963
964 scsi_target_resume(starget);
965
966 spi_initial_dv(starget) = 1;
967
968 out_free:
969 kfree(buffer);
970 out_put:
971 spi_dv_in_progress(starget) = 0;
972 scsi_device_put(sdev);
973 }
974 EXPORT_SYMBOL(spi_dv_device);
975
976 struct work_queue_wrapper {
977 struct work_struct work;
978 struct scsi_device *sdev;
979 };
980
981 static void
982 spi_dv_device_work_wrapper(struct work_struct *work)
983 {
984 struct work_queue_wrapper *wqw =
985 container_of(work, struct work_queue_wrapper, work);
986 struct scsi_device *sdev = wqw->sdev;
987
988 kfree(wqw);
989 spi_dv_device(sdev);
990 spi_dv_pending(sdev->sdev_target) = 0;
991 scsi_device_put(sdev);
992 }
993
994
995 /**
996 * spi_schedule_dv_device - schedule domain validation to occur on the device
997 * @sdev: The device to validate
998 *
999 * Identical to spi_dv_device() above, except that the DV will be
1000 * scheduled to occur in a workqueue later. All memory allocations
1001 * are atomic, so may be called from any context including those holding
1002 * SCSI locks.
1003 */
1004 void
1005 spi_schedule_dv_device(struct scsi_device *sdev)
1006 {
1007 struct work_queue_wrapper *wqw =
1008 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
1009
1010 if (unlikely(!wqw))
1011 return;
1012
1013 if (unlikely(spi_dv_pending(sdev->sdev_target))) {
1014 kfree(wqw);
1015 return;
1016 }
1017 /* Set pending early (dv_device doesn't check it, only sets it) */
1018 spi_dv_pending(sdev->sdev_target) = 1;
1019 if (unlikely(scsi_device_get(sdev))) {
1020 kfree(wqw);
1021 spi_dv_pending(sdev->sdev_target) = 0;
1022 return;
1023 }
1024
1025 INIT_WORK(&wqw->work, spi_dv_device_work_wrapper);
1026 wqw->sdev = sdev;
1027
1028 schedule_work(&wqw->work);
1029 }
1030 EXPORT_SYMBOL(spi_schedule_dv_device);
1031
1032 /**
1033 * spi_display_xfer_agreement - Print the current target transfer agreement
1034 * @starget: The target for which to display the agreement
1035 *
1036 * Each SPI port is required to maintain a transfer agreement for each
1037 * other port on the bus. This function prints a one-line summary of
1038 * the current agreement; more detailed information is available in sysfs.
1039 */
1040 void spi_display_xfer_agreement(struct scsi_target *starget)
1041 {
1042 struct spi_transport_attrs *tp;
1043 tp = (struct spi_transport_attrs *)&starget->starget_data;
1044
1045 if (tp->offset > 0 && tp->period > 0) {
1046 unsigned int picosec, kb100;
1047 char *scsi = "FAST-?";
1048 char tmp[8];
1049
1050 if (tp->period <= SPI_STATIC_PPR) {
1051 picosec = ppr_to_ps[tp->period];
1052 switch (tp->period) {
1053 case 7: scsi = "FAST-320"; break;
1054 case 8: scsi = "FAST-160"; break;
1055 case 9: scsi = "FAST-80"; break;
1056 case 10:
1057 case 11: scsi = "FAST-40"; break;
1058 case 12: scsi = "FAST-20"; break;
1059 }
1060 } else {
1061 picosec = tp->period * 4000;
1062 if (tp->period < 25)
1063 scsi = "FAST-20";
1064 else if (tp->period < 50)
1065 scsi = "FAST-10";
1066 else
1067 scsi = "FAST-5";
1068 }
1069
1070 kb100 = (10000000 + picosec / 2) / picosec;
1071 if (tp->width)
1072 kb100 *= 2;
1073 sprint_frac(tmp, picosec, 1000);
1074
1075 dev_info(&starget->dev,
1076 "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1077 scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1078 tp->dt ? "DT" : "ST",
1079 tp->iu ? " IU" : "",
1080 tp->qas ? " QAS" : "",
1081 tp->rd_strm ? " RDSTRM" : "",
1082 tp->rti ? " RTI" : "",
1083 tp->wr_flow ? " WRFLOW" : "",
1084 tp->pcomp_en ? " PCOMP" : "",
1085 tp->hold_mcs ? " HMCS" : "",
1086 tmp, tp->offset);
1087 } else {
1088 dev_info(&starget->dev, "%sasynchronous\n",
1089 tp->width ? "wide " : "");
1090 }
1091 }
1092 EXPORT_SYMBOL(spi_display_xfer_agreement);
1093
1094 int spi_populate_width_msg(unsigned char *msg, int width)
1095 {
1096 msg[0] = EXTENDED_MESSAGE;
1097 msg[1] = 2;
1098 msg[2] = EXTENDED_WDTR;
1099 msg[3] = width;
1100 return 4;
1101 }
1102 EXPORT_SYMBOL_GPL(spi_populate_width_msg);
1103
1104 int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
1105 {
1106 msg[0] = EXTENDED_MESSAGE;
1107 msg[1] = 3;
1108 msg[2] = EXTENDED_SDTR;
1109 msg[3] = period;
1110 msg[4] = offset;
1111 return 5;
1112 }
1113 EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
1114
1115 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
1116 int width, int options)
1117 {
1118 msg[0] = EXTENDED_MESSAGE;
1119 msg[1] = 6;
1120 msg[2] = EXTENDED_PPR;
1121 msg[3] = period;
1122 msg[4] = 0;
1123 msg[5] = offset;
1124 msg[6] = width;
1125 msg[7] = options;
1126 return 8;
1127 }
1128 EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
1129
1130 #ifdef CONFIG_SCSI_CONSTANTS
1131 static const char * const one_byte_msgs[] = {
1132 /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",
1133 /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error",
1134 /* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",
1135 /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1136 /* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set",
1137 /* 0x0f */ "Initiate Recovery", "Release Recovery",
1138 /* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",
1139 /* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"
1140 };
1141
1142 static const char * const two_byte_msgs[] = {
1143 /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
1144 /* 0x23 */ "Ignore Wide Residue", "ACA"
1145 };
1146
1147 static const char * const extended_msgs[] = {
1148 /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1149 /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",
1150 /* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"
1151 };
1152
1153 static void print_nego(const unsigned char *msg, int per, int off, int width)
1154 {
1155 if (per) {
1156 char buf[20];
1157 period_to_str(buf, msg[per]);
1158 printk("period = %s ns ", buf);
1159 }
1160
1161 if (off)
1162 printk("offset = %d ", msg[off]);
1163 if (width)
1164 printk("width = %d ", 8 << msg[width]);
1165 }
1166
1167 static void print_ptr(const unsigned char *msg, int msb, const char *desc)
1168 {
1169 int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |
1170 msg[msb+3];
1171 printk("%s = %d ", desc, ptr);
1172 }
1173
1174 int spi_print_msg(const unsigned char *msg)
1175 {
1176 int len = 1, i;
1177 if (msg[0] == EXTENDED_MESSAGE) {
1178 len = 2 + msg[1];
1179 if (len == 2)
1180 len += 256;
1181 if (msg[2] < ARRAY_SIZE(extended_msgs))
1182 printk ("%s ", extended_msgs[msg[2]]);
1183 else
1184 printk ("Extended Message, reserved code (0x%02x) ",
1185 (int) msg[2]);
1186 switch (msg[2]) {
1187 case EXTENDED_MODIFY_DATA_POINTER:
1188 print_ptr(msg, 3, "pointer");
1189 break;
1190 case EXTENDED_SDTR:
1191 print_nego(msg, 3, 4, 0);
1192 break;
1193 case EXTENDED_WDTR:
1194 print_nego(msg, 0, 0, 3);
1195 break;
1196 case EXTENDED_PPR:
1197 print_nego(msg, 3, 5, 6);
1198 break;
1199 case EXTENDED_MODIFY_BIDI_DATA_PTR:
1200 print_ptr(msg, 3, "out");
1201 print_ptr(msg, 7, "in");
1202 break;
1203 default:
1204 for (i = 2; i < len; ++i)
1205 printk("%02x ", msg[i]);
1206 }
1207 /* Identify */
1208 } else if (msg[0] & 0x80) {
1209 printk("Identify disconnect %sallowed %s %d ",
1210 (msg[0] & 0x40) ? "" : "not ",
1211 (msg[0] & 0x20) ? "target routine" : "lun",
1212 msg[0] & 0x7);
1213 /* Normal One byte */
1214 } else if (msg[0] < 0x1f) {
1215 if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])
1216 printk("%s ", one_byte_msgs[msg[0]]);
1217 else
1218 printk("reserved (%02x) ", msg[0]);
1219 } else if (msg[0] == 0x55) {
1220 printk("QAS Request ");
1221 /* Two byte */
1222 } else if (msg[0] <= 0x2f) {
1223 if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))
1224 printk("%s %02x ", two_byte_msgs[msg[0] - 0x20],
1225 msg[1]);
1226 else
1227 printk("reserved two byte (%02x %02x) ",
1228 msg[0], msg[1]);
1229 len = 2;
1230 } else
1231 printk("reserved ");
1232 return len;
1233 }
1234 EXPORT_SYMBOL(spi_print_msg);
1235
1236 #else /* ifndef CONFIG_SCSI_CONSTANTS */
1237
1238 int spi_print_msg(const unsigned char *msg)
1239 {
1240 int len = 1, i;
1241
1242 if (msg[0] == EXTENDED_MESSAGE) {
1243 len = 2 + msg[1];
1244 if (len == 2)
1245 len += 256;
1246 for (i = 0; i < len; ++i)
1247 printk("%02x ", msg[i]);
1248 /* Identify */
1249 } else if (msg[0] & 0x80) {
1250 printk("%02x ", msg[0]);
1251 /* Normal One byte */
1252 } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {
1253 printk("%02x ", msg[0]);
1254 /* Two byte */
1255 } else if (msg[0] <= 0x2f) {
1256 printk("%02x %02x", msg[0], msg[1]);
1257 len = 2;
1258 } else
1259 printk("%02x ", msg[0]);
1260 return len;
1261 }
1262 EXPORT_SYMBOL(spi_print_msg);
1263 #endif /* ! CONFIG_SCSI_CONSTANTS */
1264
1265 #define SETUP_ATTRIBUTE(field) \
1266 i->private_attrs[count] = class_device_attr_##field; \
1267 if (!i->f->set_##field) { \
1268 i->private_attrs[count].attr.mode = S_IRUGO; \
1269 i->private_attrs[count].store = NULL; \
1270 } \
1271 i->attrs[count] = &i->private_attrs[count]; \
1272 if (i->f->show_##field) \
1273 count++
1274
1275 #define SETUP_RELATED_ATTRIBUTE(field, rel_field) \
1276 i->private_attrs[count] = class_device_attr_##field; \
1277 if (!i->f->set_##rel_field) { \
1278 i->private_attrs[count].attr.mode = S_IRUGO; \
1279 i->private_attrs[count].store = NULL; \
1280 } \
1281 i->attrs[count] = &i->private_attrs[count]; \
1282 if (i->f->show_##rel_field) \
1283 count++
1284
1285 #define SETUP_HOST_ATTRIBUTE(field) \
1286 i->private_host_attrs[count] = class_device_attr_##field; \
1287 if (!i->f->set_##field) { \
1288 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1289 i->private_host_attrs[count].store = NULL; \
1290 } \
1291 i->host_attrs[count] = &i->private_host_attrs[count]; \
1292 count++
1293
1294 static int spi_device_match(struct attribute_container *cont,
1295 struct device *dev)
1296 {
1297 struct scsi_device *sdev;
1298 struct Scsi_Host *shost;
1299 struct spi_internal *i;
1300
1301 if (!scsi_is_sdev_device(dev))
1302 return 0;
1303
1304 sdev = to_scsi_device(dev);
1305 shost = sdev->host;
1306 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1307 != &spi_host_class.class)
1308 return 0;
1309 /* Note: this class has no device attributes, so it has
1310 * no per-HBA allocation and thus we don't need to distinguish
1311 * the attribute containers for the device */
1312 i = to_spi_internal(shost->transportt);
1313 if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1314 return 0;
1315 return 1;
1316 }
1317
1318 static int spi_target_match(struct attribute_container *cont,
1319 struct device *dev)
1320 {
1321 struct Scsi_Host *shost;
1322 struct scsi_target *starget;
1323 struct spi_internal *i;
1324
1325 if (!scsi_is_target_device(dev))
1326 return 0;
1327
1328 shost = dev_to_shost(dev->parent);
1329 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1330 != &spi_host_class.class)
1331 return 0;
1332
1333 i = to_spi_internal(shost->transportt);
1334 starget = to_scsi_target(dev);
1335
1336 if (i->f->deny_binding && i->f->deny_binding(starget))
1337 return 0;
1338
1339 return &i->t.target_attrs.ac == cont;
1340 }
1341
1342 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1343 "spi_transport",
1344 spi_setup_transport_attrs,
1345 NULL,
1346 NULL);
1347
1348 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1349 spi_device_match,
1350 spi_device_configure);
1351
1352 struct scsi_transport_template *
1353 spi_attach_transport(struct spi_function_template *ft)
1354 {
1355 int count = 0;
1356 struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
1357 GFP_KERNEL);
1358
1359 if (unlikely(!i))
1360 return NULL;
1361
1362 i->t.target_attrs.ac.class = &spi_transport_class.class;
1363 i->t.target_attrs.ac.attrs = &i->attrs[0];
1364 i->t.target_attrs.ac.match = spi_target_match;
1365 transport_container_register(&i->t.target_attrs);
1366 i->t.target_size = sizeof(struct spi_transport_attrs);
1367 i->t.host_attrs.ac.class = &spi_host_class.class;
1368 i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1369 i->t.host_attrs.ac.match = spi_host_match;
1370 transport_container_register(&i->t.host_attrs);
1371 i->t.host_size = sizeof(struct spi_host_attrs);
1372 i->f = ft;
1373
1374 SETUP_ATTRIBUTE(period);
1375 SETUP_RELATED_ATTRIBUTE(min_period, period);
1376 SETUP_ATTRIBUTE(offset);
1377 SETUP_RELATED_ATTRIBUTE(max_offset, offset);
1378 SETUP_ATTRIBUTE(width);
1379 SETUP_RELATED_ATTRIBUTE(max_width, width);
1380 SETUP_ATTRIBUTE(iu);
1381 SETUP_ATTRIBUTE(dt);
1382 SETUP_ATTRIBUTE(qas);
1383 SETUP_ATTRIBUTE(wr_flow);
1384 SETUP_ATTRIBUTE(rd_strm);
1385 SETUP_ATTRIBUTE(rti);
1386 SETUP_ATTRIBUTE(pcomp_en);
1387 SETUP_ATTRIBUTE(hold_mcs);
1388
1389 /* if you add an attribute but forget to increase SPI_NUM_ATTRS
1390 * this bug will trigger */
1391 BUG_ON(count > SPI_NUM_ATTRS);
1392
1393 i->attrs[count++] = &class_device_attr_revalidate;
1394
1395 i->attrs[count] = NULL;
1396
1397 count = 0;
1398 SETUP_HOST_ATTRIBUTE(signalling);
1399
1400 BUG_ON(count > SPI_HOST_ATTRS);
1401
1402 i->host_attrs[count] = NULL;
1403
1404 return &i->t;
1405 }
1406 EXPORT_SYMBOL(spi_attach_transport);
1407
1408 void spi_release_transport(struct scsi_transport_template *t)
1409 {
1410 struct spi_internal *i = to_spi_internal(t);
1411
1412 transport_container_unregister(&i->t.target_attrs);
1413 transport_container_unregister(&i->t.host_attrs);
1414
1415 kfree(i);
1416 }
1417 EXPORT_SYMBOL(spi_release_transport);
1418
1419 static __init int spi_transport_init(void)
1420 {
1421 int error = transport_class_register(&spi_transport_class);
1422 if (error)
1423 return error;
1424 error = anon_transport_class_register(&spi_device_class);
1425 return transport_class_register(&spi_host_class);
1426 }
1427
1428 static void __exit spi_transport_exit(void)
1429 {
1430 transport_class_unregister(&spi_transport_class);
1431 anon_transport_class_unregister(&spi_device_class);
1432 transport_class_unregister(&spi_host_class);
1433 }
1434
1435 MODULE_AUTHOR("Martin Hicks");
1436 MODULE_DESCRIPTION("SPI Transport Attributes");
1437 MODULE_LICENSE("GPL");
1438
1439 module_init(spi_transport_init);
1440 module_exit(spi_transport_exit);
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