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1da177e4 LT |
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> | |
949bf797 | 25 | #include <linux/blkdev.h> |
1da177e4 LT |
26 | #include <asm/semaphore.h> |
27 | #include <scsi/scsi.h> | |
28 | #include "scsi_priv.h" | |
29 | #include <scsi/scsi_device.h> | |
30 | #include <scsi/scsi_host.h> | |
33aa687d | 31 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
32 | #include <scsi/scsi_eh.h> |
33 | #include <scsi/scsi_transport.h> | |
34 | #include <scsi/scsi_transport_spi.h> | |
35 | ||
d872ebe4 | 36 | #define SPI_NUM_ATTRS 14 /* increase this if you add attributes */ |
1da177e4 LT |
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 | ||
949bf797 JB |
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 | ||
1da177e4 LT |
48 | /* Private data accessors (keep these out of the header file) */ |
49 | #define spi_dv_pending(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_pending) | |
50 | #define spi_dv_sem(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_sem) | |
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 | ||
33aa687d JB |
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) | |
949bf797 | 111 | { |
33aa687d JB |
112 | int i, result; |
113 | unsigned char sense[SCSI_SENSE_BUFFERSIZE]; | |
949bf797 JB |
114 | |
115 | for(i = 0; i < DV_RETRIES; i++) { | |
33aa687d JB |
116 | result = scsi_execute(sdev, cmd, dir, buffer, bufflen, |
117 | sense, DV_TIMEOUT, /* retries */ 1, | |
118 | REQ_FAILFAST); | |
119 | if (result & DRIVER_SENSE) { | |
120 | struct scsi_sense_hdr sshdr_tmp; | |
121 | if (!sshdr) | |
122 | sshdr = &sshdr_tmp; | |
123 | ||
124 | if (scsi_normalize_sense(sense, sizeof(*sense), | |
125 | sshdr) | |
126 | && sshdr->sense_key == UNIT_ATTENTION) | |
949bf797 JB |
127 | continue; |
128 | } | |
129 | break; | |
130 | } | |
33aa687d | 131 | return result; |
949bf797 JB |
132 | } |
133 | ||
1da177e4 LT |
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 < sizeof(signal_types)/sizeof(signal_types[0]); 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 < sizeof(signal_types)/sizeof(signal_types[0]); 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 | ||
d0a7e574 JB |
167 | static int spi_host_setup(struct transport_container *tc, struct device *dev, |
168 | struct class_device *cdev) | |
1da177e4 LT |
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 | ||
d0a7e574 JB |
202 | static int spi_device_configure(struct transport_container *tc, |
203 | struct device *dev, | |
204 | struct class_device *cdev) | |
1da177e4 LT |
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 | ||
d0a7e574 JB |
222 | static int spi_setup_transport_attrs(struct transport_container *tc, |
223 | struct device *dev, | |
224 | struct class_device *cdev) | |
1da177e4 LT |
225 | { |
226 | struct scsi_target *starget = to_scsi_target(dev); | |
227 | ||
228 | spi_period(starget) = -1; /* illegal value */ | |
62a86129 | 229 | spi_min_period(starget) = 0; |
1da177e4 | 230 | spi_offset(starget) = 0; /* async */ |
62a86129 | 231 | spi_max_offset(starget) = 255; |
1da177e4 | 232 | spi_width(starget) = 0; /* narrow */ |
62a86129 | 233 | spi_max_width(starget) = 1; |
1da177e4 LT |
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; | |
d872ebe4 | 241 | spi_hold_mcs(starget) = 0; |
1da177e4 LT |
242 | spi_dv_pending(starget) = 0; |
243 | spi_initial_dv(starget) = 0; | |
244 | init_MUTEX(&spi_dv_sem(starget)); | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
62a86129 JB |
249 | #define spi_transport_show_simple(field, format_string) \ |
250 | \ | |
251 | static ssize_t \ | |
252 | show_spi_transport_##field(struct class_device *cdev, char *buf) \ | |
253 | { \ | |
254 | struct scsi_target *starget = transport_class_to_starget(cdev); \ | |
255 | struct spi_transport_attrs *tp; \ | |
256 | \ | |
257 | tp = (struct spi_transport_attrs *)&starget->starget_data; \ | |
258 | return snprintf(buf, 20, format_string, tp->field); \ | |
259 | } | |
260 | ||
261 | #define spi_transport_store_simple(field, format_string) \ | |
262 | \ | |
263 | static ssize_t \ | |
264 | store_spi_transport_##field(struct class_device *cdev, const char *buf, \ | |
265 | size_t count) \ | |
266 | { \ | |
267 | int val; \ | |
268 | struct scsi_target *starget = transport_class_to_starget(cdev); \ | |
269 | struct spi_transport_attrs *tp; \ | |
270 | \ | |
271 | tp = (struct spi_transport_attrs *)&starget->starget_data; \ | |
272 | val = simple_strtoul(buf, NULL, 0); \ | |
273 | tp->field = val; \ | |
274 | return count; \ | |
275 | } | |
276 | ||
1da177e4 LT |
277 | #define spi_transport_show_function(field, format_string) \ |
278 | \ | |
279 | static ssize_t \ | |
280 | show_spi_transport_##field(struct class_device *cdev, char *buf) \ | |
281 | { \ | |
282 | struct scsi_target *starget = transport_class_to_starget(cdev); \ | |
283 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ | |
284 | struct spi_transport_attrs *tp; \ | |
285 | struct spi_internal *i = to_spi_internal(shost->transportt); \ | |
286 | tp = (struct spi_transport_attrs *)&starget->starget_data; \ | |
287 | if (i->f->get_##field) \ | |
288 | i->f->get_##field(starget); \ | |
289 | return snprintf(buf, 20, format_string, tp->field); \ | |
290 | } | |
291 | ||
292 | #define spi_transport_store_function(field, format_string) \ | |
293 | static ssize_t \ | |
294 | store_spi_transport_##field(struct class_device *cdev, const char *buf, \ | |
295 | size_t count) \ | |
296 | { \ | |
297 | int val; \ | |
298 | struct scsi_target *starget = transport_class_to_starget(cdev); \ | |
299 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ | |
300 | struct spi_internal *i = to_spi_internal(shost->transportt); \ | |
301 | \ | |
302 | val = simple_strtoul(buf, NULL, 0); \ | |
62a86129 JB |
303 | i->f->set_##field(starget, val); \ |
304 | return count; \ | |
305 | } | |
306 | ||
307 | #define spi_transport_store_max(field, format_string) \ | |
308 | static ssize_t \ | |
309 | store_spi_transport_##field(struct class_device *cdev, const char *buf, \ | |
310 | size_t count) \ | |
311 | { \ | |
312 | int val; \ | |
313 | struct scsi_target *starget = transport_class_to_starget(cdev); \ | |
314 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ | |
315 | struct spi_internal *i = to_spi_internal(shost->transportt); \ | |
316 | struct spi_transport_attrs *tp \ | |
317 | = (struct spi_transport_attrs *)&starget->starget_data; \ | |
318 | \ | |
319 | val = simple_strtoul(buf, NULL, 0); \ | |
320 | if (val > tp->max_##field) \ | |
321 | val = tp->max_##field; \ | |
1da177e4 LT |
322 | i->f->set_##field(starget, val); \ |
323 | return count; \ | |
324 | } | |
325 | ||
326 | #define spi_transport_rd_attr(field, format_string) \ | |
327 | spi_transport_show_function(field, format_string) \ | |
328 | spi_transport_store_function(field, format_string) \ | |
329 | static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \ | |
330 | show_spi_transport_##field, \ | |
331 | store_spi_transport_##field); | |
332 | ||
62a86129 JB |
333 | #define spi_transport_simple_attr(field, format_string) \ |
334 | spi_transport_show_simple(field, format_string) \ | |
335 | spi_transport_store_simple(field, format_string) \ | |
336 | static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \ | |
337 | show_spi_transport_##field, \ | |
338 | store_spi_transport_##field); | |
339 | ||
340 | #define spi_transport_max_attr(field, format_string) \ | |
341 | spi_transport_show_function(field, format_string) \ | |
342 | spi_transport_store_max(field, format_string) \ | |
343 | spi_transport_simple_attr(max_##field, format_string) \ | |
344 | static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \ | |
345 | show_spi_transport_##field, \ | |
346 | store_spi_transport_##field); | |
347 | ||
1da177e4 | 348 | /* The Parallel SCSI Tranport Attributes: */ |
62a86129 JB |
349 | spi_transport_max_attr(offset, "%d\n"); |
350 | spi_transport_max_attr(width, "%d\n"); | |
1da177e4 LT |
351 | spi_transport_rd_attr(iu, "%d\n"); |
352 | spi_transport_rd_attr(dt, "%d\n"); | |
353 | spi_transport_rd_attr(qas, "%d\n"); | |
354 | spi_transport_rd_attr(wr_flow, "%d\n"); | |
355 | spi_transport_rd_attr(rd_strm, "%d\n"); | |
356 | spi_transport_rd_attr(rti, "%d\n"); | |
357 | spi_transport_rd_attr(pcomp_en, "%d\n"); | |
d872ebe4 | 358 | spi_transport_rd_attr(hold_mcs, "%d\n"); |
1da177e4 | 359 | |
9a881f16 | 360 | /* we only care about the first child device so we return 1 */ |
361 | static int child_iter(struct device *dev, void *data) | |
362 | { | |
363 | struct scsi_device *sdev = to_scsi_device(dev); | |
364 | ||
365 | spi_dv_device(sdev); | |
366 | return 1; | |
367 | } | |
368 | ||
1da177e4 LT |
369 | static ssize_t |
370 | store_spi_revalidate(struct class_device *cdev, const char *buf, size_t count) | |
371 | { | |
372 | struct scsi_target *starget = transport_class_to_starget(cdev); | |
373 | ||
9a881f16 | 374 | device_for_each_child(&starget->dev, NULL, child_iter); |
1da177e4 LT |
375 | return count; |
376 | } | |
377 | static CLASS_DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate); | |
378 | ||
379 | /* Translate the period into ns according to the current spec | |
380 | * for SDTR/PPR messages */ | |
62a86129 JB |
381 | static ssize_t |
382 | show_spi_transport_period_helper(struct class_device *cdev, char *buf, | |
383 | int period) | |
1da177e4 | 384 | { |
1da177e4 | 385 | int len, picosec; |
1da177e4 | 386 | |
62a86129 | 387 | if (period < 0 || period > 0xff) { |
1da177e4 | 388 | picosec = -1; |
62a86129 JB |
389 | } else if (period <= SPI_STATIC_PPR) { |
390 | picosec = ppr_to_ps[period]; | |
1da177e4 | 391 | } else { |
62a86129 | 392 | picosec = period * 4000; |
1da177e4 LT |
393 | } |
394 | ||
395 | if (picosec == -1) { | |
396 | len = sprintf(buf, "reserved"); | |
397 | } else { | |
398 | len = sprint_frac(buf, picosec, 1000); | |
399 | } | |
400 | ||
401 | buf[len++] = '\n'; | |
402 | buf[len] = '\0'; | |
403 | return len; | |
404 | } | |
405 | ||
406 | static ssize_t | |
62a86129 JB |
407 | store_spi_transport_period_helper(struct class_device *cdev, const char *buf, |
408 | size_t count, int *periodp) | |
1da177e4 | 409 | { |
1da177e4 LT |
410 | int j, picosec, period = -1; |
411 | char *endp; | |
412 | ||
413 | picosec = simple_strtoul(buf, &endp, 10) * 1000; | |
414 | if (*endp == '.') { | |
415 | int mult = 100; | |
416 | do { | |
417 | endp++; | |
418 | if (!isdigit(*endp)) | |
419 | break; | |
420 | picosec += (*endp - '0') * mult; | |
421 | mult /= 10; | |
422 | } while (mult > 0); | |
423 | } | |
424 | ||
425 | for (j = 0; j <= SPI_STATIC_PPR; j++) { | |
426 | if (ppr_to_ps[j] < picosec) | |
427 | continue; | |
428 | period = j; | |
429 | break; | |
430 | } | |
431 | ||
432 | if (period == -1) | |
433 | period = picosec / 4000; | |
434 | ||
435 | if (period > 0xff) | |
436 | period = 0xff; | |
437 | ||
62a86129 | 438 | *periodp = period; |
1da177e4 LT |
439 | |
440 | return count; | |
441 | } | |
442 | ||
62a86129 JB |
443 | static ssize_t |
444 | show_spi_transport_period(struct class_device *cdev, char *buf) | |
445 | { | |
446 | struct scsi_target *starget = transport_class_to_starget(cdev); | |
447 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
448 | struct spi_internal *i = to_spi_internal(shost->transportt); | |
449 | struct spi_transport_attrs *tp = | |
450 | (struct spi_transport_attrs *)&starget->starget_data; | |
451 | ||
452 | if (i->f->get_period) | |
453 | i->f->get_period(starget); | |
454 | ||
455 | return show_spi_transport_period_helper(cdev, buf, tp->period); | |
456 | } | |
457 | ||
458 | static ssize_t | |
459 | store_spi_transport_period(struct class_device *cdev, const char *buf, | |
460 | size_t count) | |
461 | { | |
462 | struct scsi_target *starget = transport_class_to_starget(cdev); | |
463 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
464 | struct spi_internal *i = to_spi_internal(shost->transportt); | |
465 | struct spi_transport_attrs *tp = | |
466 | (struct spi_transport_attrs *)&starget->starget_data; | |
467 | int period, retval; | |
468 | ||
469 | retval = store_spi_transport_period_helper(cdev, buf, count, &period); | |
470 | ||
471 | if (period < tp->min_period) | |
472 | period = tp->min_period; | |
473 | ||
474 | i->f->set_period(starget, period); | |
475 | ||
476 | return retval; | |
477 | } | |
478 | ||
1da177e4 LT |
479 | static CLASS_DEVICE_ATTR(period, S_IRUGO | S_IWUSR, |
480 | show_spi_transport_period, | |
481 | store_spi_transport_period); | |
482 | ||
62a86129 JB |
483 | static ssize_t |
484 | show_spi_transport_min_period(struct class_device *cdev, char *buf) | |
485 | { | |
486 | struct scsi_target *starget = transport_class_to_starget(cdev); | |
487 | struct spi_transport_attrs *tp = | |
488 | (struct spi_transport_attrs *)&starget->starget_data; | |
489 | ||
490 | return show_spi_transport_period_helper(cdev, buf, tp->min_period); | |
491 | } | |
492 | ||
493 | static ssize_t | |
494 | store_spi_transport_min_period(struct class_device *cdev, const char *buf, | |
495 | size_t count) | |
496 | { | |
497 | struct scsi_target *starget = transport_class_to_starget(cdev); | |
498 | struct spi_transport_attrs *tp = | |
499 | (struct spi_transport_attrs *)&starget->starget_data; | |
500 | ||
501 | return store_spi_transport_period_helper(cdev, buf, count, | |
502 | &tp->min_period); | |
503 | } | |
504 | ||
505 | ||
506 | static CLASS_DEVICE_ATTR(min_period, S_IRUGO | S_IWUSR, | |
507 | show_spi_transport_min_period, | |
508 | store_spi_transport_min_period); | |
509 | ||
510 | ||
1da177e4 LT |
511 | static ssize_t show_spi_host_signalling(struct class_device *cdev, char *buf) |
512 | { | |
513 | struct Scsi_Host *shost = transport_class_to_shost(cdev); | |
514 | struct spi_internal *i = to_spi_internal(shost->transportt); | |
515 | ||
516 | if (i->f->get_signalling) | |
517 | i->f->get_signalling(shost); | |
518 | ||
519 | return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost))); | |
520 | } | |
521 | static ssize_t store_spi_host_signalling(struct class_device *cdev, | |
522 | const char *buf, size_t count) | |
523 | { | |
524 | struct Scsi_Host *shost = transport_class_to_shost(cdev); | |
525 | struct spi_internal *i = to_spi_internal(shost->transportt); | |
526 | enum spi_signal_type type = spi_signal_to_value(buf); | |
527 | ||
528 | if (type != SPI_SIGNAL_UNKNOWN) | |
529 | i->f->set_signalling(shost, type); | |
530 | ||
531 | return count; | |
532 | } | |
533 | static CLASS_DEVICE_ATTR(signalling, S_IRUGO | S_IWUSR, | |
534 | show_spi_host_signalling, | |
535 | store_spi_host_signalling); | |
536 | ||
537 | #define DV_SET(x, y) \ | |
538 | if(i->f->set_##x) \ | |
539 | i->f->set_##x(sdev->sdev_target, y) | |
540 | ||
1da177e4 LT |
541 | enum spi_compare_returns { |
542 | SPI_COMPARE_SUCCESS, | |
543 | SPI_COMPARE_FAILURE, | |
544 | SPI_COMPARE_SKIP_TEST, | |
545 | }; | |
546 | ||
547 | ||
548 | /* This is for read/write Domain Validation: If the device supports | |
549 | * an echo buffer, we do read/write tests to it */ | |
550 | static enum spi_compare_returns | |
33aa687d | 551 | spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer, |
1da177e4 LT |
552 | u8 *ptr, const int retries) |
553 | { | |
1da177e4 | 554 | int len = ptr - buffer; |
33aa687d | 555 | int j, k, r, result; |
1da177e4 | 556 | unsigned int pattern = 0x0000ffff; |
33aa687d | 557 | struct scsi_sense_hdr sshdr; |
1da177e4 LT |
558 | |
559 | const char spi_write_buffer[] = { | |
560 | WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0 | |
561 | }; | |
562 | const char spi_read_buffer[] = { | |
563 | READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0 | |
564 | }; | |
565 | ||
566 | /* set up the pattern buffer. Doesn't matter if we spill | |
567 | * slightly beyond since that's where the read buffer is */ | |
568 | for (j = 0; j < len; ) { | |
569 | ||
570 | /* fill the buffer with counting (test a) */ | |
571 | for ( ; j < min(len, 32); j++) | |
572 | buffer[j] = j; | |
573 | k = j; | |
574 | /* fill the buffer with alternating words of 0x0 and | |
575 | * 0xffff (test b) */ | |
576 | for ( ; j < min(len, k + 32); j += 2) { | |
577 | u16 *word = (u16 *)&buffer[j]; | |
578 | ||
579 | *word = (j & 0x02) ? 0x0000 : 0xffff; | |
580 | } | |
581 | k = j; | |
582 | /* fill with crosstalk (alternating 0x5555 0xaaa) | |
583 | * (test c) */ | |
584 | for ( ; j < min(len, k + 32); j += 2) { | |
585 | u16 *word = (u16 *)&buffer[j]; | |
586 | ||
587 | *word = (j & 0x02) ? 0x5555 : 0xaaaa; | |
588 | } | |
589 | k = j; | |
590 | /* fill with shifting bits (test d) */ | |
591 | for ( ; j < min(len, k + 32); j += 4) { | |
592 | u32 *word = (unsigned int *)&buffer[j]; | |
593 | u32 roll = (pattern & 0x80000000) ? 1 : 0; | |
594 | ||
595 | *word = pattern; | |
596 | pattern = (pattern << 1) | roll; | |
597 | } | |
598 | /* don't bother with random data (test e) */ | |
599 | } | |
600 | ||
601 | for (r = 0; r < retries; r++) { | |
33aa687d JB |
602 | result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE, |
603 | buffer, len, &sshdr); | |
604 | if(result || !scsi_device_online(sdev)) { | |
1da177e4 LT |
605 | |
606 | scsi_device_set_state(sdev, SDEV_QUIESCE); | |
33aa687d | 607 | if (scsi_sense_valid(&sshdr) |
1da177e4 LT |
608 | && sshdr.sense_key == ILLEGAL_REQUEST |
609 | /* INVALID FIELD IN CDB */ | |
610 | && sshdr.asc == 0x24 && sshdr.ascq == 0x00) | |
611 | /* This would mean that the drive lied | |
612 | * to us about supporting an echo | |
613 | * buffer (unfortunately some Western | |
614 | * Digital drives do precisely this) | |
615 | */ | |
616 | return SPI_COMPARE_SKIP_TEST; | |
617 | ||
618 | ||
9ccfc756 | 619 | sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result); |
1da177e4 LT |
620 | return SPI_COMPARE_FAILURE; |
621 | } | |
622 | ||
623 | memset(ptr, 0, len); | |
33aa687d JB |
624 | spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE, |
625 | ptr, len, NULL); | |
1da177e4 LT |
626 | scsi_device_set_state(sdev, SDEV_QUIESCE); |
627 | ||
628 | if (memcmp(buffer, ptr, len) != 0) | |
629 | return SPI_COMPARE_FAILURE; | |
630 | } | |
631 | return SPI_COMPARE_SUCCESS; | |
632 | } | |
633 | ||
634 | /* This is for the simplest form of Domain Validation: a read test | |
635 | * on the inquiry data from the device */ | |
636 | static enum spi_compare_returns | |
33aa687d | 637 | spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer, |
1da177e4 LT |
638 | u8 *ptr, const int retries) |
639 | { | |
33aa687d JB |
640 | int r, result; |
641 | const int len = sdev->inquiry_len; | |
1da177e4 LT |
642 | const char spi_inquiry[] = { |
643 | INQUIRY, 0, 0, 0, len, 0 | |
644 | }; | |
645 | ||
646 | for (r = 0; r < retries; r++) { | |
1da177e4 LT |
647 | memset(ptr, 0, len); |
648 | ||
33aa687d JB |
649 | result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE, |
650 | ptr, len, NULL); | |
1da177e4 | 651 | |
33aa687d | 652 | if(result || !scsi_device_online(sdev)) { |
1da177e4 LT |
653 | scsi_device_set_state(sdev, SDEV_QUIESCE); |
654 | return SPI_COMPARE_FAILURE; | |
655 | } | |
656 | ||
657 | /* If we don't have the inquiry data already, the | |
658 | * first read gets it */ | |
659 | if (ptr == buffer) { | |
660 | ptr += len; | |
661 | --r; | |
662 | continue; | |
663 | } | |
664 | ||
665 | if (memcmp(buffer, ptr, len) != 0) | |
666 | /* failure */ | |
667 | return SPI_COMPARE_FAILURE; | |
668 | } | |
669 | return SPI_COMPARE_SUCCESS; | |
670 | } | |
671 | ||
672 | static enum spi_compare_returns | |
33aa687d | 673 | spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr, |
1da177e4 | 674 | enum spi_compare_returns |
33aa687d | 675 | (*compare_fn)(struct scsi_device *, u8 *, u8 *, int)) |
1da177e4 | 676 | { |
33aa687d | 677 | struct spi_internal *i = to_spi_internal(sdev->host->transportt); |
9a8bc9b8 | 678 | struct scsi_target *starget = sdev->sdev_target; |
1da177e4 LT |
679 | int period = 0, prevperiod = 0; |
680 | enum spi_compare_returns retval; | |
681 | ||
682 | ||
683 | for (;;) { | |
684 | int newperiod; | |
33aa687d | 685 | retval = compare_fn(sdev, buffer, ptr, DV_LOOPS); |
1da177e4 LT |
686 | |
687 | if (retval == SPI_COMPARE_SUCCESS | |
688 | || retval == SPI_COMPARE_SKIP_TEST) | |
689 | break; | |
690 | ||
691 | /* OK, retrain, fallback */ | |
9a8bc9b8 JB |
692 | if (i->f->get_iu) |
693 | i->f->get_iu(starget); | |
694 | if (i->f->get_qas) | |
695 | i->f->get_qas(starget); | |
1da177e4 LT |
696 | if (i->f->get_period) |
697 | i->f->get_period(sdev->sdev_target); | |
9a8bc9b8 JB |
698 | |
699 | /* Here's the fallback sequence; first try turning off | |
700 | * IU, then QAS (if we can control them), then finally | |
701 | * fall down the periods */ | |
702 | if (i->f->set_iu && spi_iu(starget)) { | |
9ccfc756 | 703 | starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n"); |
9a8bc9b8 JB |
704 | DV_SET(iu, 0); |
705 | } else if (i->f->set_qas && spi_qas(starget)) { | |
9ccfc756 | 706 | starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n"); |
9a8bc9b8 JB |
707 | DV_SET(qas, 0); |
708 | } else { | |
709 | newperiod = spi_period(starget); | |
710 | period = newperiod > period ? newperiod : period; | |
711 | if (period < 0x0d) | |
712 | period++; | |
713 | else | |
714 | period += period >> 1; | |
715 | ||
716 | if (unlikely(period > 0xff || period == prevperiod)) { | |
717 | /* Total failure; set to async and return */ | |
9ccfc756 | 718 | starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n"); |
9a8bc9b8 JB |
719 | DV_SET(offset, 0); |
720 | return SPI_COMPARE_FAILURE; | |
721 | } | |
9ccfc756 | 722 | starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n"); |
9a8bc9b8 JB |
723 | DV_SET(period, period); |
724 | prevperiod = period; | |
1da177e4 | 725 | } |
1da177e4 LT |
726 | } |
727 | return retval; | |
728 | } | |
729 | ||
730 | static int | |
33aa687d | 731 | spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer) |
1da177e4 | 732 | { |
33aa687d | 733 | int l, result; |
1da177e4 LT |
734 | |
735 | /* first off do a test unit ready. This can error out | |
736 | * because of reservations or some other reason. If it | |
737 | * fails, the device won't let us write to the echo buffer | |
738 | * so just return failure */ | |
739 | ||
740 | const char spi_test_unit_ready[] = { | |
741 | TEST_UNIT_READY, 0, 0, 0, 0, 0 | |
742 | }; | |
743 | ||
744 | const char spi_read_buffer_descriptor[] = { | |
745 | READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0 | |
746 | }; | |
747 | ||
748 | ||
1da177e4 LT |
749 | /* We send a set of three TURs to clear any outstanding |
750 | * unit attention conditions if they exist (Otherwise the | |
751 | * buffer tests won't be happy). If the TUR still fails | |
752 | * (reservation conflict, device not ready, etc) just | |
753 | * skip the write tests */ | |
754 | for (l = 0; ; l++) { | |
33aa687d JB |
755 | result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE, |
756 | NULL, 0, NULL); | |
1da177e4 | 757 | |
33aa687d | 758 | if(result) { |
1da177e4 LT |
759 | if(l >= 3) |
760 | return 0; | |
761 | } else { | |
762 | /* TUR succeeded */ | |
763 | break; | |
764 | } | |
765 | } | |
766 | ||
33aa687d JB |
767 | result = spi_execute(sdev, spi_read_buffer_descriptor, |
768 | DMA_FROM_DEVICE, buffer, 4, NULL); | |
1da177e4 | 769 | |
33aa687d | 770 | if (result) |
1da177e4 LT |
771 | /* Device has no echo buffer */ |
772 | return 0; | |
773 | ||
774 | return buffer[3] + ((buffer[2] & 0x1f) << 8); | |
775 | } | |
776 | ||
777 | static void | |
33aa687d | 778 | spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer) |
1da177e4 | 779 | { |
33aa687d | 780 | struct spi_internal *i = to_spi_internal(sdev->host->transportt); |
62a86129 | 781 | struct scsi_target *starget = sdev->sdev_target; |
1da177e4 LT |
782 | int len = sdev->inquiry_len; |
783 | /* first set us up for narrow async */ | |
784 | DV_SET(offset, 0); | |
785 | DV_SET(width, 0); | |
786 | ||
33aa687d | 787 | if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS) |
1da177e4 | 788 | != SPI_COMPARE_SUCCESS) { |
9ccfc756 | 789 | starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n"); |
1da177e4 LT |
790 | /* FIXME: should probably offline the device here? */ |
791 | return; | |
792 | } | |
793 | ||
794 | /* test width */ | |
eb1dd68b JB |
795 | if (i->f->set_width && spi_max_width(starget) && |
796 | scsi_device_wide(sdev)) { | |
9a8bc9b8 | 797 | i->f->set_width(starget, 1); |
62a86129 | 798 | |
33aa687d | 799 | if (spi_dv_device_compare_inquiry(sdev, buffer, |
1da177e4 LT |
800 | buffer + len, |
801 | DV_LOOPS) | |
802 | != SPI_COMPARE_SUCCESS) { | |
9ccfc756 | 803 | starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n"); |
9a8bc9b8 | 804 | i->f->set_width(starget, 0); |
1da177e4 LT |
805 | } |
806 | } | |
807 | ||
808 | if (!i->f->set_period) | |
809 | return; | |
810 | ||
811 | /* device can't handle synchronous */ | |
eb1dd68b | 812 | if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev)) |
1da177e4 LT |
813 | return; |
814 | ||
349cd7cf JB |
815 | /* len == -1 is the signal that we need to ascertain the |
816 | * presence of an echo buffer before trying to use it. len == | |
817 | * 0 means we don't have an echo buffer */ | |
818 | len = -1; | |
1da177e4 LT |
819 | |
820 | retry: | |
821 | ||
822 | /* now set up to the maximum */ | |
62a86129 JB |
823 | DV_SET(offset, spi_max_offset(starget)); |
824 | DV_SET(period, spi_min_period(starget)); | |
9a8bc9b8 JB |
825 | /* try QAS requests; this should be harmless to set if the |
826 | * target supports it */ | |
eb1dd68b JB |
827 | if (scsi_device_qas(sdev)) |
828 | DV_SET(qas, 1); | |
9a8bc9b8 | 829 | /* Also try IU transfers */ |
eb1dd68b JB |
830 | if (scsi_device_ius(sdev)) |
831 | DV_SET(iu, 1); | |
9a8bc9b8 JB |
832 | if (spi_min_period(starget) < 9) { |
833 | /* This u320 (or u640). Ignore the coupled parameters | |
834 | * like DT and IU, but set the optional ones */ | |
835 | DV_SET(rd_strm, 1); | |
836 | DV_SET(wr_flow, 1); | |
837 | DV_SET(rti, 1); | |
838 | if (spi_min_period(starget) == 8) | |
839 | DV_SET(pcomp_en, 1); | |
840 | } | |
349cd7cf JB |
841 | /* Do the read only INQUIRY tests */ |
842 | spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len, | |
843 | spi_dv_device_compare_inquiry); | |
844 | /* See if we actually managed to negotiate and sustain DT */ | |
845 | if (i->f->get_dt) | |
846 | i->f->get_dt(starget); | |
847 | ||
848 | /* see if the device has an echo buffer. If it does we can do | |
849 | * the SPI pattern write tests. Because of some broken | |
850 | * devices, we *only* try this on a device that has actually | |
851 | * negotiated DT */ | |
852 | ||
853 | if (len == -1 && spi_dt(starget)) | |
854 | len = spi_dv_device_get_echo_buffer(sdev, buffer); | |
1da177e4 | 855 | |
349cd7cf | 856 | if (len <= 0) { |
9ccfc756 | 857 | starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n"); |
1da177e4 LT |
858 | return; |
859 | } | |
860 | ||
861 | if (len > SPI_MAX_ECHO_BUFFER_SIZE) { | |
9ccfc756 | 862 | starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE); |
1da177e4 LT |
863 | len = SPI_MAX_ECHO_BUFFER_SIZE; |
864 | } | |
865 | ||
33aa687d | 866 | if (spi_dv_retrain(sdev, buffer, buffer + len, |
1da177e4 LT |
867 | spi_dv_device_echo_buffer) |
868 | == SPI_COMPARE_SKIP_TEST) { | |
869 | /* OK, the stupid drive can't do a write echo buffer | |
870 | * test after all, fall back to the read tests */ | |
871 | len = 0; | |
872 | goto retry; | |
873 | } | |
874 | } | |
875 | ||
876 | ||
877 | /** spi_dv_device - Do Domain Validation on the device | |
878 | * @sdev: scsi device to validate | |
879 | * | |
880 | * Performs the domain validation on the given device in the | |
881 | * current execution thread. Since DV operations may sleep, | |
882 | * the current thread must have user context. Also no SCSI | |
883 | * related locks that would deadlock I/O issued by the DV may | |
884 | * be held. | |
885 | */ | |
886 | void | |
887 | spi_dv_device(struct scsi_device *sdev) | |
888 | { | |
1da177e4 LT |
889 | struct scsi_target *starget = sdev->sdev_target; |
890 | u8 *buffer; | |
891 | const int len = SPI_MAX_ECHO_BUFFER_SIZE*2; | |
892 | ||
1da177e4 | 893 | if (unlikely(scsi_device_get(sdev))) |
33aa687d | 894 | return; |
1da177e4 LT |
895 | |
896 | buffer = kmalloc(len, GFP_KERNEL); | |
897 | ||
898 | if (unlikely(!buffer)) | |
899 | goto out_put; | |
900 | ||
901 | memset(buffer, 0, len); | |
902 | ||
903 | /* We need to verify that the actual device will quiesce; the | |
904 | * later target quiesce is just a nice to have */ | |
905 | if (unlikely(scsi_device_quiesce(sdev))) | |
906 | goto out_free; | |
907 | ||
908 | scsi_target_quiesce(starget); | |
909 | ||
910 | spi_dv_pending(starget) = 1; | |
911 | down(&spi_dv_sem(starget)); | |
912 | ||
9ccfc756 | 913 | starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n"); |
1da177e4 | 914 | |
33aa687d | 915 | spi_dv_device_internal(sdev, buffer); |
1da177e4 | 916 | |
9ccfc756 | 917 | starget_printk(KERN_INFO, starget, "Ending Domain Validation\n"); |
1da177e4 LT |
918 | |
919 | up(&spi_dv_sem(starget)); | |
920 | spi_dv_pending(starget) = 0; | |
921 | ||
922 | scsi_target_resume(starget); | |
923 | ||
924 | spi_initial_dv(starget) = 1; | |
925 | ||
926 | out_free: | |
927 | kfree(buffer); | |
928 | out_put: | |
929 | scsi_device_put(sdev); | |
1da177e4 LT |
930 | } |
931 | EXPORT_SYMBOL(spi_dv_device); | |
932 | ||
933 | struct work_queue_wrapper { | |
934 | struct work_struct work; | |
935 | struct scsi_device *sdev; | |
936 | }; | |
937 | ||
938 | static void | |
939 | spi_dv_device_work_wrapper(void *data) | |
940 | { | |
941 | struct work_queue_wrapper *wqw = (struct work_queue_wrapper *)data; | |
942 | struct scsi_device *sdev = wqw->sdev; | |
943 | ||
944 | kfree(wqw); | |
945 | spi_dv_device(sdev); | |
946 | spi_dv_pending(sdev->sdev_target) = 0; | |
947 | scsi_device_put(sdev); | |
948 | } | |
949 | ||
950 | ||
951 | /** | |
952 | * spi_schedule_dv_device - schedule domain validation to occur on the device | |
953 | * @sdev: The device to validate | |
954 | * | |
955 | * Identical to spi_dv_device() above, except that the DV will be | |
956 | * scheduled to occur in a workqueue later. All memory allocations | |
957 | * are atomic, so may be called from any context including those holding | |
958 | * SCSI locks. | |
959 | */ | |
960 | void | |
961 | spi_schedule_dv_device(struct scsi_device *sdev) | |
962 | { | |
963 | struct work_queue_wrapper *wqw = | |
964 | kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC); | |
965 | ||
966 | if (unlikely(!wqw)) | |
967 | return; | |
968 | ||
969 | if (unlikely(spi_dv_pending(sdev->sdev_target))) { | |
970 | kfree(wqw); | |
971 | return; | |
972 | } | |
973 | /* Set pending early (dv_device doesn't check it, only sets it) */ | |
974 | spi_dv_pending(sdev->sdev_target) = 1; | |
975 | if (unlikely(scsi_device_get(sdev))) { | |
976 | kfree(wqw); | |
977 | spi_dv_pending(sdev->sdev_target) = 0; | |
978 | return; | |
979 | } | |
980 | ||
981 | INIT_WORK(&wqw->work, spi_dv_device_work_wrapper, wqw); | |
982 | wqw->sdev = sdev; | |
983 | ||
984 | schedule_work(&wqw->work); | |
985 | } | |
986 | EXPORT_SYMBOL(spi_schedule_dv_device); | |
987 | ||
988 | /** | |
989 | * spi_display_xfer_agreement - Print the current target transfer agreement | |
990 | * @starget: The target for which to display the agreement | |
991 | * | |
992 | * Each SPI port is required to maintain a transfer agreement for each | |
993 | * other port on the bus. This function prints a one-line summary of | |
994 | * the current agreement; more detailed information is available in sysfs. | |
995 | */ | |
996 | void spi_display_xfer_agreement(struct scsi_target *starget) | |
997 | { | |
998 | struct spi_transport_attrs *tp; | |
999 | tp = (struct spi_transport_attrs *)&starget->starget_data; | |
1000 | ||
1001 | if (tp->offset > 0 && tp->period > 0) { | |
1002 | unsigned int picosec, kb100; | |
1003 | char *scsi = "FAST-?"; | |
1004 | char tmp[8]; | |
1005 | ||
1006 | if (tp->period <= SPI_STATIC_PPR) { | |
1007 | picosec = ppr_to_ps[tp->period]; | |
1008 | switch (tp->period) { | |
1009 | case 7: scsi = "FAST-320"; break; | |
1010 | case 8: scsi = "FAST-160"; break; | |
1011 | case 9: scsi = "FAST-80"; break; | |
1012 | case 10: | |
1013 | case 11: scsi = "FAST-40"; break; | |
1014 | case 12: scsi = "FAST-20"; break; | |
1015 | } | |
1016 | } else { | |
1017 | picosec = tp->period * 4000; | |
1018 | if (tp->period < 25) | |
1019 | scsi = "FAST-20"; | |
1020 | else if (tp->period < 50) | |
1021 | scsi = "FAST-10"; | |
1022 | else | |
1023 | scsi = "FAST-5"; | |
1024 | } | |
1025 | ||
1026 | kb100 = (10000000 + picosec / 2) / picosec; | |
1027 | if (tp->width) | |
1028 | kb100 *= 2; | |
1029 | sprint_frac(tmp, picosec, 1000); | |
1030 | ||
1031 | dev_info(&starget->dev, | |
d872ebe4 JB |
1032 | "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n", |
1033 | scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10, | |
1034 | tp->dt ? "DT" : "ST", | |
1035 | tp->iu ? " IU" : "", | |
1036 | tp->qas ? " QAS" : "", | |
1037 | tp->rd_strm ? " RDSTRM" : "", | |
1038 | tp->rti ? " RTI" : "", | |
1039 | tp->wr_flow ? " WRFLOW" : "", | |
1040 | tp->pcomp_en ? " PCOMP" : "", | |
1041 | tp->hold_mcs ? " HMCS" : "", | |
1042 | tmp, tp->offset); | |
1da177e4 | 1043 | } else { |
493ff4ee | 1044 | dev_info(&starget->dev, "%sasynchronous\n", |
1da177e4 LT |
1045 | tp->width ? "wide " : ""); |
1046 | } | |
1047 | } | |
1048 | EXPORT_SYMBOL(spi_display_xfer_agreement); | |
1049 | ||
1050 | #define SETUP_ATTRIBUTE(field) \ | |
1051 | i->private_attrs[count] = class_device_attr_##field; \ | |
1052 | if (!i->f->set_##field) { \ | |
1053 | i->private_attrs[count].attr.mode = S_IRUGO; \ | |
1054 | i->private_attrs[count].store = NULL; \ | |
1055 | } \ | |
1056 | i->attrs[count] = &i->private_attrs[count]; \ | |
1057 | if (i->f->show_##field) \ | |
1058 | count++ | |
1059 | ||
62a86129 JB |
1060 | #define SETUP_RELATED_ATTRIBUTE(field, rel_field) \ |
1061 | i->private_attrs[count] = class_device_attr_##field; \ | |
1062 | if (!i->f->set_##rel_field) { \ | |
1063 | i->private_attrs[count].attr.mode = S_IRUGO; \ | |
1064 | i->private_attrs[count].store = NULL; \ | |
1065 | } \ | |
1066 | i->attrs[count] = &i->private_attrs[count]; \ | |
1067 | if (i->f->show_##rel_field) \ | |
1068 | count++ | |
1069 | ||
1da177e4 LT |
1070 | #define SETUP_HOST_ATTRIBUTE(field) \ |
1071 | i->private_host_attrs[count] = class_device_attr_##field; \ | |
1072 | if (!i->f->set_##field) { \ | |
1073 | i->private_host_attrs[count].attr.mode = S_IRUGO; \ | |
1074 | i->private_host_attrs[count].store = NULL; \ | |
1075 | } \ | |
1076 | i->host_attrs[count] = &i->private_host_attrs[count]; \ | |
1077 | count++ | |
1078 | ||
1079 | static int spi_device_match(struct attribute_container *cont, | |
1080 | struct device *dev) | |
1081 | { | |
1082 | struct scsi_device *sdev; | |
1083 | struct Scsi_Host *shost; | |
10c1b889 | 1084 | struct spi_internal *i; |
1da177e4 LT |
1085 | |
1086 | if (!scsi_is_sdev_device(dev)) | |
1087 | return 0; | |
1088 | ||
1089 | sdev = to_scsi_device(dev); | |
1090 | shost = sdev->host; | |
1091 | if (!shost->transportt || shost->transportt->host_attrs.ac.class | |
1092 | != &spi_host_class.class) | |
1093 | return 0; | |
1094 | /* Note: this class has no device attributes, so it has | |
1095 | * no per-HBA allocation and thus we don't need to distinguish | |
1096 | * the attribute containers for the device */ | |
10c1b889 JB |
1097 | i = to_spi_internal(shost->transportt); |
1098 | if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target)) | |
1099 | return 0; | |
1da177e4 LT |
1100 | return 1; |
1101 | } | |
1102 | ||
1103 | static int spi_target_match(struct attribute_container *cont, | |
1104 | struct device *dev) | |
1105 | { | |
1106 | struct Scsi_Host *shost; | |
10c1b889 | 1107 | struct scsi_target *starget; |
1da177e4 LT |
1108 | struct spi_internal *i; |
1109 | ||
1110 | if (!scsi_is_target_device(dev)) | |
1111 | return 0; | |
1112 | ||
1113 | shost = dev_to_shost(dev->parent); | |
1114 | if (!shost->transportt || shost->transportt->host_attrs.ac.class | |
1115 | != &spi_host_class.class) | |
1116 | return 0; | |
1117 | ||
1118 | i = to_spi_internal(shost->transportt); | |
10c1b889 JB |
1119 | starget = to_scsi_target(dev); |
1120 | ||
1121 | if (i->f->deny_binding && i->f->deny_binding(starget)) | |
1122 | return 0; | |
1123 | ||
1da177e4 LT |
1124 | return &i->t.target_attrs.ac == cont; |
1125 | } | |
1126 | ||
1127 | static DECLARE_TRANSPORT_CLASS(spi_transport_class, | |
1128 | "spi_transport", | |
1129 | spi_setup_transport_attrs, | |
1130 | NULL, | |
1131 | NULL); | |
1132 | ||
1133 | static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class, | |
1134 | spi_device_match, | |
1135 | spi_device_configure); | |
1136 | ||
1137 | struct scsi_transport_template * | |
1138 | spi_attach_transport(struct spi_function_template *ft) | |
1139 | { | |
1140 | struct spi_internal *i = kmalloc(sizeof(struct spi_internal), | |
1141 | GFP_KERNEL); | |
1142 | int count = 0; | |
1143 | if (unlikely(!i)) | |
1144 | return NULL; | |
1145 | ||
1146 | memset(i, 0, sizeof(struct spi_internal)); | |
1147 | ||
1148 | ||
1149 | i->t.target_attrs.ac.class = &spi_transport_class.class; | |
1150 | i->t.target_attrs.ac.attrs = &i->attrs[0]; | |
1151 | i->t.target_attrs.ac.match = spi_target_match; | |
1152 | transport_container_register(&i->t.target_attrs); | |
1153 | i->t.target_size = sizeof(struct spi_transport_attrs); | |
1154 | i->t.host_attrs.ac.class = &spi_host_class.class; | |
1155 | i->t.host_attrs.ac.attrs = &i->host_attrs[0]; | |
1156 | i->t.host_attrs.ac.match = spi_host_match; | |
1157 | transport_container_register(&i->t.host_attrs); | |
1158 | i->t.host_size = sizeof(struct spi_host_attrs); | |
1159 | i->f = ft; | |
1160 | ||
1161 | SETUP_ATTRIBUTE(period); | |
62a86129 | 1162 | SETUP_RELATED_ATTRIBUTE(min_period, period); |
1da177e4 | 1163 | SETUP_ATTRIBUTE(offset); |
62a86129 | 1164 | SETUP_RELATED_ATTRIBUTE(max_offset, offset); |
1da177e4 | 1165 | SETUP_ATTRIBUTE(width); |
62a86129 | 1166 | SETUP_RELATED_ATTRIBUTE(max_width, width); |
1da177e4 LT |
1167 | SETUP_ATTRIBUTE(iu); |
1168 | SETUP_ATTRIBUTE(dt); | |
1169 | SETUP_ATTRIBUTE(qas); | |
1170 | SETUP_ATTRIBUTE(wr_flow); | |
1171 | SETUP_ATTRIBUTE(rd_strm); | |
1172 | SETUP_ATTRIBUTE(rti); | |
1173 | SETUP_ATTRIBUTE(pcomp_en); | |
d872ebe4 | 1174 | SETUP_ATTRIBUTE(hold_mcs); |
1da177e4 LT |
1175 | |
1176 | /* if you add an attribute but forget to increase SPI_NUM_ATTRS | |
1177 | * this bug will trigger */ | |
1178 | BUG_ON(count > SPI_NUM_ATTRS); | |
1179 | ||
1180 | i->attrs[count++] = &class_device_attr_revalidate; | |
1181 | ||
1182 | i->attrs[count] = NULL; | |
1183 | ||
1184 | count = 0; | |
1185 | SETUP_HOST_ATTRIBUTE(signalling); | |
1186 | ||
1187 | BUG_ON(count > SPI_HOST_ATTRS); | |
1188 | ||
1189 | i->host_attrs[count] = NULL; | |
1190 | ||
1191 | return &i->t; | |
1192 | } | |
1193 | EXPORT_SYMBOL(spi_attach_transport); | |
1194 | ||
1195 | void spi_release_transport(struct scsi_transport_template *t) | |
1196 | { | |
1197 | struct spi_internal *i = to_spi_internal(t); | |
1198 | ||
1199 | transport_container_unregister(&i->t.target_attrs); | |
1200 | transport_container_unregister(&i->t.host_attrs); | |
1201 | ||
1202 | kfree(i); | |
1203 | } | |
1204 | EXPORT_SYMBOL(spi_release_transport); | |
1205 | ||
1206 | static __init int spi_transport_init(void) | |
1207 | { | |
1208 | int error = transport_class_register(&spi_transport_class); | |
1209 | if (error) | |
1210 | return error; | |
1211 | error = anon_transport_class_register(&spi_device_class); | |
1212 | return transport_class_register(&spi_host_class); | |
1213 | } | |
1214 | ||
1215 | static void __exit spi_transport_exit(void) | |
1216 | { | |
1217 | transport_class_unregister(&spi_transport_class); | |
1218 | anon_transport_class_unregister(&spi_device_class); | |
1219 | transport_class_unregister(&spi_host_class); | |
1220 | } | |
1221 | ||
1222 | MODULE_AUTHOR("Martin Hicks"); | |
1223 | MODULE_DESCRIPTION("SPI Transport Attributes"); | |
1224 | MODULE_LICENSE("GPL"); | |
1225 | ||
1226 | module_init(spi_transport_init); | |
1227 | module_exit(spi_transport_exit); |