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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> |
d158d261 | 26 | #include <linux/mutex.h> |
1da177e4 LT |
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) | |
dfdc58ba | 50 | #define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress) |
d158d261 | 51 | #define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex) |
1da177e4 LT |
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 | ||
33aa687d JB |
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) | |
949bf797 | 112 | { |
33aa687d JB |
113 | int i, result; |
114 | unsigned char sense[SCSI_SENSE_BUFFERSIZE]; | |
949bf797 JB |
115 | |
116 | for(i = 0; i < DV_RETRIES; i++) { | |
33aa687d JB |
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) | |
949bf797 JB |
128 | continue; |
129 | } | |
130 | break; | |
131 | } | |
33aa687d | 132 | return result; |
949bf797 JB |
133 | } |
134 | ||
1da177e4 LT |
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 | ||
6391a113 | 149 | for (i = 0; i < ARRAY_SIZE(signal_types); i++) { |
1da177e4 LT |
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 | ||
6391a113 | 159 | for (i = 0; i < ARRAY_SIZE(signal_types); i++) { |
1da177e4 LT |
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 | ||
d0a7e574 JB |
168 | static int spi_host_setup(struct transport_container *tc, struct device *dev, |
169 | struct class_device *cdev) | |
1da177e4 LT |
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 | ||
d0a7e574 JB |
203 | static int spi_device_configure(struct transport_container *tc, |
204 | struct device *dev, | |
205 | struct class_device *cdev) | |
1da177e4 LT |
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 | ||
d0a7e574 JB |
223 | static int spi_setup_transport_attrs(struct transport_container *tc, |
224 | struct device *dev, | |
225 | struct class_device *cdev) | |
1da177e4 LT |
226 | { |
227 | struct scsi_target *starget = to_scsi_target(dev); | |
228 | ||
229 | spi_period(starget) = -1; /* illegal value */ | |
62a86129 | 230 | spi_min_period(starget) = 0; |
1da177e4 | 231 | spi_offset(starget) = 0; /* async */ |
62a86129 | 232 | spi_max_offset(starget) = 255; |
1da177e4 | 233 | spi_width(starget) = 0; /* narrow */ |
62a86129 | 234 | spi_max_width(starget) = 1; |
1da177e4 LT |
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; | |
d872ebe4 | 242 | spi_hold_mcs(starget) = 0; |
1da177e4 | 243 | spi_dv_pending(starget) = 0; |
dfdc58ba | 244 | spi_dv_in_progress(starget) = 0; |
1da177e4 | 245 | spi_initial_dv(starget) = 0; |
d158d261 | 246 | mutex_init(&spi_dv_mutex(starget)); |
1da177e4 LT |
247 | |
248 | return 0; | |
249 | } | |
250 | ||
62a86129 JB |
251 | #define spi_transport_show_simple(field, format_string) \ |
252 | \ | |
253 | static ssize_t \ | |
254 | show_spi_transport_##field(struct class_device *cdev, char *buf) \ | |
255 | { \ | |
256 | struct scsi_target *starget = transport_class_to_starget(cdev); \ | |
257 | struct spi_transport_attrs *tp; \ | |
258 | \ | |
259 | tp = (struct spi_transport_attrs *)&starget->starget_data; \ | |
260 | return snprintf(buf, 20, format_string, tp->field); \ | |
261 | } | |
262 | ||
263 | #define spi_transport_store_simple(field, format_string) \ | |
264 | \ | |
265 | static ssize_t \ | |
266 | store_spi_transport_##field(struct class_device *cdev, const char *buf, \ | |
267 | size_t count) \ | |
268 | { \ | |
269 | int val; \ | |
270 | struct scsi_target *starget = transport_class_to_starget(cdev); \ | |
271 | struct spi_transport_attrs *tp; \ | |
272 | \ | |
273 | tp = (struct spi_transport_attrs *)&starget->starget_data; \ | |
274 | val = simple_strtoul(buf, NULL, 0); \ | |
275 | tp->field = val; \ | |
276 | return count; \ | |
277 | } | |
278 | ||
1da177e4 LT |
279 | #define spi_transport_show_function(field, format_string) \ |
280 | \ | |
281 | static ssize_t \ | |
282 | show_spi_transport_##field(struct class_device *cdev, char *buf) \ | |
283 | { \ | |
284 | struct scsi_target *starget = transport_class_to_starget(cdev); \ | |
285 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ | |
286 | struct spi_transport_attrs *tp; \ | |
287 | struct spi_internal *i = to_spi_internal(shost->transportt); \ | |
288 | tp = (struct spi_transport_attrs *)&starget->starget_data; \ | |
289 | if (i->f->get_##field) \ | |
290 | i->f->get_##field(starget); \ | |
291 | return snprintf(buf, 20, format_string, tp->field); \ | |
292 | } | |
293 | ||
294 | #define spi_transport_store_function(field, format_string) \ | |
295 | static ssize_t \ | |
296 | store_spi_transport_##field(struct class_device *cdev, const char *buf, \ | |
297 | size_t count) \ | |
298 | { \ | |
299 | int val; \ | |
300 | struct scsi_target *starget = transport_class_to_starget(cdev); \ | |
301 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ | |
302 | struct spi_internal *i = to_spi_internal(shost->transportt); \ | |
303 | \ | |
304 | val = simple_strtoul(buf, NULL, 0); \ | |
62a86129 JB |
305 | i->f->set_##field(starget, val); \ |
306 | return count; \ | |
307 | } | |
308 | ||
309 | #define spi_transport_store_max(field, format_string) \ | |
310 | static ssize_t \ | |
311 | store_spi_transport_##field(struct class_device *cdev, const char *buf, \ | |
312 | size_t count) \ | |
313 | { \ | |
314 | int val; \ | |
315 | struct scsi_target *starget = transport_class_to_starget(cdev); \ | |
316 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ | |
317 | struct spi_internal *i = to_spi_internal(shost->transportt); \ | |
318 | struct spi_transport_attrs *tp \ | |
319 | = (struct spi_transport_attrs *)&starget->starget_data; \ | |
320 | \ | |
321 | val = simple_strtoul(buf, NULL, 0); \ | |
322 | if (val > tp->max_##field) \ | |
323 | val = tp->max_##field; \ | |
1da177e4 LT |
324 | i->f->set_##field(starget, val); \ |
325 | return count; \ | |
326 | } | |
327 | ||
328 | #define spi_transport_rd_attr(field, format_string) \ | |
329 | spi_transport_show_function(field, format_string) \ | |
330 | spi_transport_store_function(field, format_string) \ | |
331 | static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \ | |
332 | show_spi_transport_##field, \ | |
333 | store_spi_transport_##field); | |
334 | ||
62a86129 JB |
335 | #define spi_transport_simple_attr(field, format_string) \ |
336 | spi_transport_show_simple(field, format_string) \ | |
337 | spi_transport_store_simple(field, format_string) \ | |
338 | static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \ | |
339 | show_spi_transport_##field, \ | |
340 | store_spi_transport_##field); | |
341 | ||
342 | #define spi_transport_max_attr(field, format_string) \ | |
343 | spi_transport_show_function(field, format_string) \ | |
344 | spi_transport_store_max(field, format_string) \ | |
345 | spi_transport_simple_attr(max_##field, format_string) \ | |
346 | static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR, \ | |
347 | show_spi_transport_##field, \ | |
348 | store_spi_transport_##field); | |
349 | ||
1da177e4 | 350 | /* The Parallel SCSI Tranport Attributes: */ |
62a86129 JB |
351 | spi_transport_max_attr(offset, "%d\n"); |
352 | spi_transport_max_attr(width, "%d\n"); | |
1da177e4 LT |
353 | spi_transport_rd_attr(iu, "%d\n"); |
354 | spi_transport_rd_attr(dt, "%d\n"); | |
355 | spi_transport_rd_attr(qas, "%d\n"); | |
356 | spi_transport_rd_attr(wr_flow, "%d\n"); | |
357 | spi_transport_rd_attr(rd_strm, "%d\n"); | |
358 | spi_transport_rd_attr(rti, "%d\n"); | |
359 | spi_transport_rd_attr(pcomp_en, "%d\n"); | |
d872ebe4 | 360 | spi_transport_rd_attr(hold_mcs, "%d\n"); |
1da177e4 | 361 | |
9a881f16 | 362 | /* we only care about the first child device so we return 1 */ |
363 | static int child_iter(struct device *dev, void *data) | |
364 | { | |
365 | struct scsi_device *sdev = to_scsi_device(dev); | |
366 | ||
367 | spi_dv_device(sdev); | |
368 | return 1; | |
369 | } | |
370 | ||
1da177e4 LT |
371 | static ssize_t |
372 | store_spi_revalidate(struct class_device *cdev, const char *buf, size_t count) | |
373 | { | |
374 | struct scsi_target *starget = transport_class_to_starget(cdev); | |
375 | ||
9a881f16 | 376 | device_for_each_child(&starget->dev, NULL, child_iter); |
1da177e4 LT |
377 | return count; |
378 | } | |
379 | static CLASS_DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate); | |
380 | ||
381 | /* Translate the period into ns according to the current spec | |
382 | * for SDTR/PPR messages */ | |
ef72582e | 383 | static int period_to_str(char *buf, 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 | ||
ef72582e MW |
401 | return len; |
402 | } | |
403 | ||
404 | static ssize_t | |
ea697e45 | 405 | show_spi_transport_period_helper(char *buf, int period) |
ef72582e MW |
406 | { |
407 | int len = period_to_str(buf, period); | |
1da177e4 LT |
408 | buf[len++] = '\n'; |
409 | buf[len] = '\0'; | |
410 | return len; | |
411 | } | |
412 | ||
413 | static ssize_t | |
62a86129 JB |
414 | store_spi_transport_period_helper(struct class_device *cdev, const char *buf, |
415 | size_t count, int *periodp) | |
1da177e4 | 416 | { |
1da177e4 LT |
417 | int j, picosec, period = -1; |
418 | char *endp; | |
419 | ||
420 | picosec = simple_strtoul(buf, &endp, 10) * 1000; | |
421 | if (*endp == '.') { | |
422 | int mult = 100; | |
423 | do { | |
424 | endp++; | |
425 | if (!isdigit(*endp)) | |
426 | break; | |
427 | picosec += (*endp - '0') * mult; | |
428 | mult /= 10; | |
429 | } while (mult > 0); | |
430 | } | |
431 | ||
432 | for (j = 0; j <= SPI_STATIC_PPR; j++) { | |
433 | if (ppr_to_ps[j] < picosec) | |
434 | continue; | |
435 | period = j; | |
436 | break; | |
437 | } | |
438 | ||
439 | if (period == -1) | |
440 | period = picosec / 4000; | |
441 | ||
442 | if (period > 0xff) | |
443 | period = 0xff; | |
444 | ||
62a86129 | 445 | *periodp = period; |
1da177e4 LT |
446 | |
447 | return count; | |
448 | } | |
449 | ||
62a86129 JB |
450 | static ssize_t |
451 | show_spi_transport_period(struct class_device *cdev, char *buf) | |
452 | { | |
453 | struct scsi_target *starget = transport_class_to_starget(cdev); | |
454 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
455 | struct spi_internal *i = to_spi_internal(shost->transportt); | |
456 | struct spi_transport_attrs *tp = | |
457 | (struct spi_transport_attrs *)&starget->starget_data; | |
458 | ||
459 | if (i->f->get_period) | |
460 | i->f->get_period(starget); | |
461 | ||
ea697e45 | 462 | return show_spi_transport_period_helper(buf, tp->period); |
62a86129 JB |
463 | } |
464 | ||
465 | static ssize_t | |
466 | store_spi_transport_period(struct class_device *cdev, const char *buf, | |
467 | size_t count) | |
468 | { | |
469 | struct scsi_target *starget = transport_class_to_starget(cdev); | |
470 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
471 | struct spi_internal *i = to_spi_internal(shost->transportt); | |
472 | struct spi_transport_attrs *tp = | |
473 | (struct spi_transport_attrs *)&starget->starget_data; | |
474 | int period, retval; | |
475 | ||
476 | retval = store_spi_transport_period_helper(cdev, buf, count, &period); | |
477 | ||
478 | if (period < tp->min_period) | |
479 | period = tp->min_period; | |
480 | ||
481 | i->f->set_period(starget, period); | |
482 | ||
483 | return retval; | |
484 | } | |
485 | ||
1da177e4 LT |
486 | static CLASS_DEVICE_ATTR(period, S_IRUGO | S_IWUSR, |
487 | show_spi_transport_period, | |
488 | store_spi_transport_period); | |
489 | ||
62a86129 JB |
490 | static ssize_t |
491 | show_spi_transport_min_period(struct class_device *cdev, char *buf) | |
492 | { | |
493 | struct scsi_target *starget = transport_class_to_starget(cdev); | |
494 | struct spi_transport_attrs *tp = | |
495 | (struct spi_transport_attrs *)&starget->starget_data; | |
496 | ||
ea697e45 | 497 | return show_spi_transport_period_helper(buf, tp->min_period); |
62a86129 JB |
498 | } |
499 | ||
500 | static ssize_t | |
501 | store_spi_transport_min_period(struct class_device *cdev, const char *buf, | |
502 | size_t count) | |
503 | { | |
504 | struct scsi_target *starget = transport_class_to_starget(cdev); | |
505 | struct spi_transport_attrs *tp = | |
506 | (struct spi_transport_attrs *)&starget->starget_data; | |
507 | ||
508 | return store_spi_transport_period_helper(cdev, buf, count, | |
509 | &tp->min_period); | |
510 | } | |
511 | ||
512 | ||
513 | static CLASS_DEVICE_ATTR(min_period, S_IRUGO | S_IWUSR, | |
514 | show_spi_transport_min_period, | |
515 | store_spi_transport_min_period); | |
516 | ||
517 | ||
1da177e4 LT |
518 | static ssize_t show_spi_host_signalling(struct class_device *cdev, char *buf) |
519 | { | |
520 | struct Scsi_Host *shost = transport_class_to_shost(cdev); | |
521 | struct spi_internal *i = to_spi_internal(shost->transportt); | |
522 | ||
523 | if (i->f->get_signalling) | |
524 | i->f->get_signalling(shost); | |
525 | ||
526 | return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost))); | |
527 | } | |
528 | static ssize_t store_spi_host_signalling(struct class_device *cdev, | |
529 | const char *buf, size_t count) | |
530 | { | |
531 | struct Scsi_Host *shost = transport_class_to_shost(cdev); | |
532 | struct spi_internal *i = to_spi_internal(shost->transportt); | |
533 | enum spi_signal_type type = spi_signal_to_value(buf); | |
534 | ||
535 | if (type != SPI_SIGNAL_UNKNOWN) | |
536 | i->f->set_signalling(shost, type); | |
537 | ||
538 | return count; | |
539 | } | |
540 | static CLASS_DEVICE_ATTR(signalling, S_IRUGO | S_IWUSR, | |
541 | show_spi_host_signalling, | |
542 | store_spi_host_signalling); | |
543 | ||
544 | #define DV_SET(x, y) \ | |
545 | if(i->f->set_##x) \ | |
546 | i->f->set_##x(sdev->sdev_target, y) | |
547 | ||
1da177e4 LT |
548 | enum spi_compare_returns { |
549 | SPI_COMPARE_SUCCESS, | |
550 | SPI_COMPARE_FAILURE, | |
551 | SPI_COMPARE_SKIP_TEST, | |
552 | }; | |
553 | ||
554 | ||
555 | /* This is for read/write Domain Validation: If the device supports | |
556 | * an echo buffer, we do read/write tests to it */ | |
557 | static enum spi_compare_returns | |
33aa687d | 558 | spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer, |
1da177e4 LT |
559 | u8 *ptr, const int retries) |
560 | { | |
1da177e4 | 561 | int len = ptr - buffer; |
33aa687d | 562 | int j, k, r, result; |
1da177e4 | 563 | unsigned int pattern = 0x0000ffff; |
33aa687d | 564 | struct scsi_sense_hdr sshdr; |
1da177e4 LT |
565 | |
566 | const char spi_write_buffer[] = { | |
567 | WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0 | |
568 | }; | |
569 | const char spi_read_buffer[] = { | |
570 | READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0 | |
571 | }; | |
572 | ||
573 | /* set up the pattern buffer. Doesn't matter if we spill | |
574 | * slightly beyond since that's where the read buffer is */ | |
575 | for (j = 0; j < len; ) { | |
576 | ||
577 | /* fill the buffer with counting (test a) */ | |
578 | for ( ; j < min(len, 32); j++) | |
579 | buffer[j] = j; | |
580 | k = j; | |
581 | /* fill the buffer with alternating words of 0x0 and | |
582 | * 0xffff (test b) */ | |
583 | for ( ; j < min(len, k + 32); j += 2) { | |
584 | u16 *word = (u16 *)&buffer[j]; | |
585 | ||
586 | *word = (j & 0x02) ? 0x0000 : 0xffff; | |
587 | } | |
588 | k = j; | |
589 | /* fill with crosstalk (alternating 0x5555 0xaaa) | |
590 | * (test c) */ | |
591 | for ( ; j < min(len, k + 32); j += 2) { | |
592 | u16 *word = (u16 *)&buffer[j]; | |
593 | ||
594 | *word = (j & 0x02) ? 0x5555 : 0xaaaa; | |
595 | } | |
596 | k = j; | |
597 | /* fill with shifting bits (test d) */ | |
598 | for ( ; j < min(len, k + 32); j += 4) { | |
599 | u32 *word = (unsigned int *)&buffer[j]; | |
600 | u32 roll = (pattern & 0x80000000) ? 1 : 0; | |
601 | ||
602 | *word = pattern; | |
603 | pattern = (pattern << 1) | roll; | |
604 | } | |
605 | /* don't bother with random data (test e) */ | |
606 | } | |
607 | ||
608 | for (r = 0; r < retries; r++) { | |
33aa687d JB |
609 | result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE, |
610 | buffer, len, &sshdr); | |
611 | if(result || !scsi_device_online(sdev)) { | |
1da177e4 LT |
612 | |
613 | scsi_device_set_state(sdev, SDEV_QUIESCE); | |
33aa687d | 614 | if (scsi_sense_valid(&sshdr) |
1da177e4 LT |
615 | && sshdr.sense_key == ILLEGAL_REQUEST |
616 | /* INVALID FIELD IN CDB */ | |
617 | && sshdr.asc == 0x24 && sshdr.ascq == 0x00) | |
618 | /* This would mean that the drive lied | |
619 | * to us about supporting an echo | |
620 | * buffer (unfortunately some Western | |
621 | * Digital drives do precisely this) | |
622 | */ | |
623 | return SPI_COMPARE_SKIP_TEST; | |
624 | ||
625 | ||
9ccfc756 | 626 | sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result); |
1da177e4 LT |
627 | return SPI_COMPARE_FAILURE; |
628 | } | |
629 | ||
630 | memset(ptr, 0, len); | |
33aa687d JB |
631 | spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE, |
632 | ptr, len, NULL); | |
1da177e4 LT |
633 | scsi_device_set_state(sdev, SDEV_QUIESCE); |
634 | ||
635 | if (memcmp(buffer, ptr, len) != 0) | |
636 | return SPI_COMPARE_FAILURE; | |
637 | } | |
638 | return SPI_COMPARE_SUCCESS; | |
639 | } | |
640 | ||
641 | /* This is for the simplest form of Domain Validation: a read test | |
642 | * on the inquiry data from the device */ | |
643 | static enum spi_compare_returns | |
33aa687d | 644 | spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer, |
1da177e4 LT |
645 | u8 *ptr, const int retries) |
646 | { | |
33aa687d JB |
647 | int r, result; |
648 | const int len = sdev->inquiry_len; | |
1da177e4 LT |
649 | const char spi_inquiry[] = { |
650 | INQUIRY, 0, 0, 0, len, 0 | |
651 | }; | |
652 | ||
653 | for (r = 0; r < retries; r++) { | |
1da177e4 LT |
654 | memset(ptr, 0, len); |
655 | ||
33aa687d JB |
656 | result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE, |
657 | ptr, len, NULL); | |
1da177e4 | 658 | |
33aa687d | 659 | if(result || !scsi_device_online(sdev)) { |
1da177e4 LT |
660 | scsi_device_set_state(sdev, SDEV_QUIESCE); |
661 | return SPI_COMPARE_FAILURE; | |
662 | } | |
663 | ||
664 | /* If we don't have the inquiry data already, the | |
665 | * first read gets it */ | |
666 | if (ptr == buffer) { | |
667 | ptr += len; | |
668 | --r; | |
669 | continue; | |
670 | } | |
671 | ||
672 | if (memcmp(buffer, ptr, len) != 0) | |
673 | /* failure */ | |
674 | return SPI_COMPARE_FAILURE; | |
675 | } | |
676 | return SPI_COMPARE_SUCCESS; | |
677 | } | |
678 | ||
679 | static enum spi_compare_returns | |
33aa687d | 680 | spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr, |
1da177e4 | 681 | enum spi_compare_returns |
33aa687d | 682 | (*compare_fn)(struct scsi_device *, u8 *, u8 *, int)) |
1da177e4 | 683 | { |
33aa687d | 684 | struct spi_internal *i = to_spi_internal(sdev->host->transportt); |
9a8bc9b8 | 685 | struct scsi_target *starget = sdev->sdev_target; |
1da177e4 LT |
686 | int period = 0, prevperiod = 0; |
687 | enum spi_compare_returns retval; | |
688 | ||
689 | ||
690 | for (;;) { | |
691 | int newperiod; | |
33aa687d | 692 | retval = compare_fn(sdev, buffer, ptr, DV_LOOPS); |
1da177e4 LT |
693 | |
694 | if (retval == SPI_COMPARE_SUCCESS | |
695 | || retval == SPI_COMPARE_SKIP_TEST) | |
696 | break; | |
697 | ||
698 | /* OK, retrain, fallback */ | |
9a8bc9b8 JB |
699 | if (i->f->get_iu) |
700 | i->f->get_iu(starget); | |
701 | if (i->f->get_qas) | |
702 | i->f->get_qas(starget); | |
1da177e4 LT |
703 | if (i->f->get_period) |
704 | i->f->get_period(sdev->sdev_target); | |
9a8bc9b8 JB |
705 | |
706 | /* Here's the fallback sequence; first try turning off | |
707 | * IU, then QAS (if we can control them), then finally | |
708 | * fall down the periods */ | |
709 | if (i->f->set_iu && spi_iu(starget)) { | |
9ccfc756 | 710 | starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n"); |
9a8bc9b8 JB |
711 | DV_SET(iu, 0); |
712 | } else if (i->f->set_qas && spi_qas(starget)) { | |
9ccfc756 | 713 | starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n"); |
9a8bc9b8 JB |
714 | DV_SET(qas, 0); |
715 | } else { | |
716 | newperiod = spi_period(starget); | |
717 | period = newperiod > period ? newperiod : period; | |
718 | if (period < 0x0d) | |
719 | period++; | |
720 | else | |
721 | period += period >> 1; | |
722 | ||
723 | if (unlikely(period > 0xff || period == prevperiod)) { | |
724 | /* Total failure; set to async and return */ | |
9ccfc756 | 725 | starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n"); |
9a8bc9b8 JB |
726 | DV_SET(offset, 0); |
727 | return SPI_COMPARE_FAILURE; | |
728 | } | |
9ccfc756 | 729 | starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n"); |
9a8bc9b8 JB |
730 | DV_SET(period, period); |
731 | prevperiod = period; | |
1da177e4 | 732 | } |
1da177e4 LT |
733 | } |
734 | return retval; | |
735 | } | |
736 | ||
737 | static int | |
33aa687d | 738 | spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer) |
1da177e4 | 739 | { |
33aa687d | 740 | int l, result; |
1da177e4 LT |
741 | |
742 | /* first off do a test unit ready. This can error out | |
743 | * because of reservations or some other reason. If it | |
744 | * fails, the device won't let us write to the echo buffer | |
745 | * so just return failure */ | |
746 | ||
747 | const char spi_test_unit_ready[] = { | |
748 | TEST_UNIT_READY, 0, 0, 0, 0, 0 | |
749 | }; | |
750 | ||
751 | const char spi_read_buffer_descriptor[] = { | |
752 | READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0 | |
753 | }; | |
754 | ||
755 | ||
1da177e4 LT |
756 | /* We send a set of three TURs to clear any outstanding |
757 | * unit attention conditions if they exist (Otherwise the | |
758 | * buffer tests won't be happy). If the TUR still fails | |
759 | * (reservation conflict, device not ready, etc) just | |
760 | * skip the write tests */ | |
761 | for (l = 0; ; l++) { | |
33aa687d JB |
762 | result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE, |
763 | NULL, 0, NULL); | |
1da177e4 | 764 | |
33aa687d | 765 | if(result) { |
1da177e4 LT |
766 | if(l >= 3) |
767 | return 0; | |
768 | } else { | |
769 | /* TUR succeeded */ | |
770 | break; | |
771 | } | |
772 | } | |
773 | ||
33aa687d JB |
774 | result = spi_execute(sdev, spi_read_buffer_descriptor, |
775 | DMA_FROM_DEVICE, buffer, 4, NULL); | |
1da177e4 | 776 | |
33aa687d | 777 | if (result) |
1da177e4 LT |
778 | /* Device has no echo buffer */ |
779 | return 0; | |
780 | ||
781 | return buffer[3] + ((buffer[2] & 0x1f) << 8); | |
782 | } | |
783 | ||
784 | static void | |
33aa687d | 785 | spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer) |
1da177e4 | 786 | { |
33aa687d | 787 | struct spi_internal *i = to_spi_internal(sdev->host->transportt); |
62a86129 | 788 | struct scsi_target *starget = sdev->sdev_target; |
60eef257 | 789 | struct Scsi_Host *shost = sdev->host; |
1da177e4 LT |
790 | int len = sdev->inquiry_len; |
791 | /* first set us up for narrow async */ | |
792 | DV_SET(offset, 0); | |
793 | DV_SET(width, 0); | |
794 | ||
33aa687d | 795 | if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS) |
1da177e4 | 796 | != SPI_COMPARE_SUCCESS) { |
9ccfc756 | 797 | starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n"); |
1da177e4 LT |
798 | /* FIXME: should probably offline the device here? */ |
799 | return; | |
800 | } | |
801 | ||
802 | /* test width */ | |
eb1dd68b JB |
803 | if (i->f->set_width && spi_max_width(starget) && |
804 | scsi_device_wide(sdev)) { | |
9a8bc9b8 | 805 | i->f->set_width(starget, 1); |
62a86129 | 806 | |
33aa687d | 807 | if (spi_dv_device_compare_inquiry(sdev, buffer, |
1da177e4 LT |
808 | buffer + len, |
809 | DV_LOOPS) | |
810 | != SPI_COMPARE_SUCCESS) { | |
9ccfc756 | 811 | starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n"); |
9a8bc9b8 | 812 | i->f->set_width(starget, 0); |
1da177e4 LT |
813 | } |
814 | } | |
815 | ||
816 | if (!i->f->set_period) | |
817 | return; | |
818 | ||
819 | /* device can't handle synchronous */ | |
eb1dd68b | 820 | if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev)) |
1da177e4 LT |
821 | return; |
822 | ||
349cd7cf JB |
823 | /* len == -1 is the signal that we need to ascertain the |
824 | * presence of an echo buffer before trying to use it. len == | |
825 | * 0 means we don't have an echo buffer */ | |
826 | len = -1; | |
1da177e4 LT |
827 | |
828 | retry: | |
829 | ||
830 | /* now set up to the maximum */ | |
62a86129 JB |
831 | DV_SET(offset, spi_max_offset(starget)); |
832 | DV_SET(period, spi_min_period(starget)); | |
9a8bc9b8 JB |
833 | /* try QAS requests; this should be harmless to set if the |
834 | * target supports it */ | |
dfdc58ba | 835 | if (scsi_device_qas(sdev)) { |
eb1dd68b | 836 | DV_SET(qas, 1); |
dfdc58ba JB |
837 | } else { |
838 | DV_SET(qas, 0); | |
839 | } | |
840 | ||
841 | if (scsi_device_ius(sdev) && spi_min_period(starget) < 9) { | |
842 | /* This u320 (or u640). Set IU transfers */ | |
eb1dd68b | 843 | DV_SET(iu, 1); |
dfdc58ba | 844 | /* Then set the optional parameters */ |
9a8bc9b8 JB |
845 | DV_SET(rd_strm, 1); |
846 | DV_SET(wr_flow, 1); | |
847 | DV_SET(rti, 1); | |
848 | if (spi_min_period(starget) == 8) | |
849 | DV_SET(pcomp_en, 1); | |
dfdc58ba JB |
850 | } else { |
851 | DV_SET(iu, 0); | |
9a8bc9b8 | 852 | } |
dfdc58ba | 853 | |
60eef257 JB |
854 | /* now that we've done all this, actually check the bus |
855 | * signal type (if known). Some devices are stupid on | |
856 | * a SE bus and still claim they can try LVD only settings */ | |
857 | if (i->f->get_signalling) | |
858 | i->f->get_signalling(shost); | |
859 | if (spi_signalling(shost) == SPI_SIGNAL_SE || | |
dfdc58ba JB |
860 | spi_signalling(shost) == SPI_SIGNAL_HVD || |
861 | !scsi_device_dt(sdev)) { | |
60eef257 | 862 | DV_SET(dt, 0); |
dfdc58ba JB |
863 | } else { |
864 | DV_SET(dt, 1); | |
865 | } | |
349cd7cf JB |
866 | /* Do the read only INQUIRY tests */ |
867 | spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len, | |
868 | spi_dv_device_compare_inquiry); | |
869 | /* See if we actually managed to negotiate and sustain DT */ | |
870 | if (i->f->get_dt) | |
871 | i->f->get_dt(starget); | |
872 | ||
873 | /* see if the device has an echo buffer. If it does we can do | |
874 | * the SPI pattern write tests. Because of some broken | |
875 | * devices, we *only* try this on a device that has actually | |
876 | * negotiated DT */ | |
877 | ||
878 | if (len == -1 && spi_dt(starget)) | |
879 | len = spi_dv_device_get_echo_buffer(sdev, buffer); | |
1da177e4 | 880 | |
349cd7cf | 881 | if (len <= 0) { |
9ccfc756 | 882 | starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n"); |
1da177e4 LT |
883 | return; |
884 | } | |
885 | ||
886 | if (len > SPI_MAX_ECHO_BUFFER_SIZE) { | |
9ccfc756 | 887 | starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE); |
1da177e4 LT |
888 | len = SPI_MAX_ECHO_BUFFER_SIZE; |
889 | } | |
890 | ||
33aa687d | 891 | if (spi_dv_retrain(sdev, buffer, buffer + len, |
1da177e4 LT |
892 | spi_dv_device_echo_buffer) |
893 | == SPI_COMPARE_SKIP_TEST) { | |
894 | /* OK, the stupid drive can't do a write echo buffer | |
895 | * test after all, fall back to the read tests */ | |
896 | len = 0; | |
897 | goto retry; | |
898 | } | |
899 | } | |
900 | ||
901 | ||
902 | /** spi_dv_device - Do Domain Validation on the device | |
903 | * @sdev: scsi device to validate | |
904 | * | |
905 | * Performs the domain validation on the given device in the | |
906 | * current execution thread. Since DV operations may sleep, | |
907 | * the current thread must have user context. Also no SCSI | |
908 | * related locks that would deadlock I/O issued by the DV may | |
909 | * be held. | |
910 | */ | |
911 | void | |
912 | spi_dv_device(struct scsi_device *sdev) | |
913 | { | |
1da177e4 LT |
914 | struct scsi_target *starget = sdev->sdev_target; |
915 | u8 *buffer; | |
916 | const int len = SPI_MAX_ECHO_BUFFER_SIZE*2; | |
917 | ||
1da177e4 | 918 | if (unlikely(scsi_device_get(sdev))) |
33aa687d | 919 | return; |
1da177e4 | 920 | |
dfdc58ba JB |
921 | if (unlikely(spi_dv_in_progress(starget))) |
922 | return; | |
923 | spi_dv_in_progress(starget) = 1; | |
924 | ||
24669f75 | 925 | buffer = kzalloc(len, GFP_KERNEL); |
1da177e4 LT |
926 | |
927 | if (unlikely(!buffer)) | |
928 | goto out_put; | |
929 | ||
1da177e4 LT |
930 | /* We need to verify that the actual device will quiesce; the |
931 | * later target quiesce is just a nice to have */ | |
932 | if (unlikely(scsi_device_quiesce(sdev))) | |
933 | goto out_free; | |
934 | ||
935 | scsi_target_quiesce(starget); | |
936 | ||
937 | spi_dv_pending(starget) = 1; | |
d158d261 | 938 | mutex_lock(&spi_dv_mutex(starget)); |
1da177e4 | 939 | |
9ccfc756 | 940 | starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n"); |
1da177e4 | 941 | |
33aa687d | 942 | spi_dv_device_internal(sdev, buffer); |
1da177e4 | 943 | |
9ccfc756 | 944 | starget_printk(KERN_INFO, starget, "Ending Domain Validation\n"); |
1da177e4 | 945 | |
d158d261 | 946 | mutex_unlock(&spi_dv_mutex(starget)); |
1da177e4 LT |
947 | spi_dv_pending(starget) = 0; |
948 | ||
949 | scsi_target_resume(starget); | |
950 | ||
951 | spi_initial_dv(starget) = 1; | |
952 | ||
953 | out_free: | |
954 | kfree(buffer); | |
955 | out_put: | |
dfdc58ba | 956 | spi_dv_in_progress(starget) = 0; |
1da177e4 | 957 | scsi_device_put(sdev); |
1da177e4 LT |
958 | } |
959 | EXPORT_SYMBOL(spi_dv_device); | |
960 | ||
961 | struct work_queue_wrapper { | |
962 | struct work_struct work; | |
963 | struct scsi_device *sdev; | |
964 | }; | |
965 | ||
966 | static void | |
c4028958 | 967 | spi_dv_device_work_wrapper(struct work_struct *work) |
1da177e4 | 968 | { |
c4028958 DH |
969 | struct work_queue_wrapper *wqw = |
970 | container_of(work, struct work_queue_wrapper, work); | |
1da177e4 LT |
971 | struct scsi_device *sdev = wqw->sdev; |
972 | ||
973 | kfree(wqw); | |
974 | spi_dv_device(sdev); | |
975 | spi_dv_pending(sdev->sdev_target) = 0; | |
976 | scsi_device_put(sdev); | |
977 | } | |
978 | ||
979 | ||
980 | /** | |
981 | * spi_schedule_dv_device - schedule domain validation to occur on the device | |
982 | * @sdev: The device to validate | |
983 | * | |
984 | * Identical to spi_dv_device() above, except that the DV will be | |
985 | * scheduled to occur in a workqueue later. All memory allocations | |
986 | * are atomic, so may be called from any context including those holding | |
987 | * SCSI locks. | |
988 | */ | |
989 | void | |
990 | spi_schedule_dv_device(struct scsi_device *sdev) | |
991 | { | |
992 | struct work_queue_wrapper *wqw = | |
993 | kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC); | |
994 | ||
995 | if (unlikely(!wqw)) | |
996 | return; | |
997 | ||
998 | if (unlikely(spi_dv_pending(sdev->sdev_target))) { | |
999 | kfree(wqw); | |
1000 | return; | |
1001 | } | |
1002 | /* Set pending early (dv_device doesn't check it, only sets it) */ | |
1003 | spi_dv_pending(sdev->sdev_target) = 1; | |
1004 | if (unlikely(scsi_device_get(sdev))) { | |
1005 | kfree(wqw); | |
1006 | spi_dv_pending(sdev->sdev_target) = 0; | |
1007 | return; | |
1008 | } | |
1009 | ||
c4028958 | 1010 | INIT_WORK(&wqw->work, spi_dv_device_work_wrapper); |
1da177e4 LT |
1011 | wqw->sdev = sdev; |
1012 | ||
1013 | schedule_work(&wqw->work); | |
1014 | } | |
1015 | EXPORT_SYMBOL(spi_schedule_dv_device); | |
1016 | ||
1017 | /** | |
1018 | * spi_display_xfer_agreement - Print the current target transfer agreement | |
1019 | * @starget: The target for which to display the agreement | |
1020 | * | |
1021 | * Each SPI port is required to maintain a transfer agreement for each | |
1022 | * other port on the bus. This function prints a one-line summary of | |
1023 | * the current agreement; more detailed information is available in sysfs. | |
1024 | */ | |
1025 | void spi_display_xfer_agreement(struct scsi_target *starget) | |
1026 | { | |
1027 | struct spi_transport_attrs *tp; | |
1028 | tp = (struct spi_transport_attrs *)&starget->starget_data; | |
1029 | ||
1030 | if (tp->offset > 0 && tp->period > 0) { | |
1031 | unsigned int picosec, kb100; | |
1032 | char *scsi = "FAST-?"; | |
1033 | char tmp[8]; | |
1034 | ||
1035 | if (tp->period <= SPI_STATIC_PPR) { | |
1036 | picosec = ppr_to_ps[tp->period]; | |
1037 | switch (tp->period) { | |
1038 | case 7: scsi = "FAST-320"; break; | |
1039 | case 8: scsi = "FAST-160"; break; | |
1040 | case 9: scsi = "FAST-80"; break; | |
1041 | case 10: | |
1042 | case 11: scsi = "FAST-40"; break; | |
1043 | case 12: scsi = "FAST-20"; break; | |
1044 | } | |
1045 | } else { | |
1046 | picosec = tp->period * 4000; | |
1047 | if (tp->period < 25) | |
1048 | scsi = "FAST-20"; | |
1049 | else if (tp->period < 50) | |
1050 | scsi = "FAST-10"; | |
1051 | else | |
1052 | scsi = "FAST-5"; | |
1053 | } | |
1054 | ||
1055 | kb100 = (10000000 + picosec / 2) / picosec; | |
1056 | if (tp->width) | |
1057 | kb100 *= 2; | |
1058 | sprint_frac(tmp, picosec, 1000); | |
1059 | ||
1060 | dev_info(&starget->dev, | |
d872ebe4 JB |
1061 | "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n", |
1062 | scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10, | |
1063 | tp->dt ? "DT" : "ST", | |
1064 | tp->iu ? " IU" : "", | |
1065 | tp->qas ? " QAS" : "", | |
1066 | tp->rd_strm ? " RDSTRM" : "", | |
1067 | tp->rti ? " RTI" : "", | |
1068 | tp->wr_flow ? " WRFLOW" : "", | |
1069 | tp->pcomp_en ? " PCOMP" : "", | |
1070 | tp->hold_mcs ? " HMCS" : "", | |
1071 | tmp, tp->offset); | |
1da177e4 | 1072 | } else { |
493ff4ee | 1073 | dev_info(&starget->dev, "%sasynchronous\n", |
1da177e4 LT |
1074 | tp->width ? "wide " : ""); |
1075 | } | |
1076 | } | |
1077 | EXPORT_SYMBOL(spi_display_xfer_agreement); | |
1078 | ||
6ea3c0b2 MW |
1079 | int spi_populate_width_msg(unsigned char *msg, int width) |
1080 | { | |
1081 | msg[0] = EXTENDED_MESSAGE; | |
1082 | msg[1] = 2; | |
1083 | msg[2] = EXTENDED_WDTR; | |
1084 | msg[3] = width; | |
1085 | return 4; | |
1086 | } | |
38e14f89 | 1087 | EXPORT_SYMBOL_GPL(spi_populate_width_msg); |
6ea3c0b2 MW |
1088 | |
1089 | int spi_populate_sync_msg(unsigned char *msg, int period, int offset) | |
1090 | { | |
1091 | msg[0] = EXTENDED_MESSAGE; | |
1092 | msg[1] = 3; | |
1093 | msg[2] = EXTENDED_SDTR; | |
1094 | msg[3] = period; | |
1095 | msg[4] = offset; | |
1096 | return 5; | |
1097 | } | |
38e14f89 | 1098 | EXPORT_SYMBOL_GPL(spi_populate_sync_msg); |
6ea3c0b2 MW |
1099 | |
1100 | int spi_populate_ppr_msg(unsigned char *msg, int period, int offset, | |
1101 | int width, int options) | |
1102 | { | |
1103 | msg[0] = EXTENDED_MESSAGE; | |
1104 | msg[1] = 6; | |
1105 | msg[2] = EXTENDED_PPR; | |
1106 | msg[3] = period; | |
1107 | msg[4] = 0; | |
1108 | msg[5] = offset; | |
1109 | msg[6] = width; | |
1110 | msg[7] = options; | |
1111 | return 8; | |
1112 | } | |
38e14f89 | 1113 | EXPORT_SYMBOL_GPL(spi_populate_ppr_msg); |
6ea3c0b2 | 1114 | |
410ca5c7 MW |
1115 | #ifdef CONFIG_SCSI_CONSTANTS |
1116 | static const char * const one_byte_msgs[] = { | |
72df0ebf | 1117 | /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers", |
410ca5c7 | 1118 | /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error", |
72df0ebf | 1119 | /* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error", |
410ca5c7 | 1120 | /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag", |
72df0ebf MW |
1121 | /* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set", |
1122 | /* 0x0f */ "Initiate Recovery", "Release Recovery", | |
1123 | /* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable", | |
1124 | /* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset" | |
410ca5c7 | 1125 | }; |
410ca5c7 MW |
1126 | |
1127 | static const char * const two_byte_msgs[] = { | |
47972153 | 1128 | /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag", |
72df0ebf | 1129 | /* 0x23 */ "Ignore Wide Residue", "ACA" |
410ca5c7 | 1130 | }; |
410ca5c7 MW |
1131 | |
1132 | static const char * const extended_msgs[] = { | |
1133 | /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request", | |
ef72582e | 1134 | /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request", |
fc25307d | 1135 | /* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer" |
410ca5c7 | 1136 | }; |
410ca5c7 | 1137 | |
bdd70f2c | 1138 | static void print_nego(const unsigned char *msg, int per, int off, int width) |
ef72582e MW |
1139 | { |
1140 | if (per) { | |
1141 | char buf[20]; | |
1142 | period_to_str(buf, msg[per]); | |
1143 | printk("period = %s ns ", buf); | |
1144 | } | |
1145 | ||
1146 | if (off) | |
1147 | printk("offset = %d ", msg[off]); | |
1148 | if (width) | |
1149 | printk("width = %d ", 8 << msg[width]); | |
1150 | } | |
410ca5c7 | 1151 | |
fc25307d MW |
1152 | static void print_ptr(const unsigned char *msg, int msb, const char *desc) |
1153 | { | |
1154 | int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) | | |
1155 | msg[msb+3]; | |
1156 | printk("%s = %d ", desc, ptr); | |
1157 | } | |
1158 | ||
1abfd370 | 1159 | int spi_print_msg(const unsigned char *msg) |
410ca5c7 | 1160 | { |
72df0ebf | 1161 | int len = 1, i; |
410ca5c7 | 1162 | if (msg[0] == EXTENDED_MESSAGE) { |
fc25307d MW |
1163 | len = 2 + msg[1]; |
1164 | if (len == 2) | |
1165 | len += 256; | |
b32aaffc | 1166 | if (msg[2] < ARRAY_SIZE(extended_msgs)) |
410ca5c7 MW |
1167 | printk ("%s ", extended_msgs[msg[2]]); |
1168 | else | |
1169 | printk ("Extended Message, reserved code (0x%02x) ", | |
1170 | (int) msg[2]); | |
1171 | switch (msg[2]) { | |
1172 | case EXTENDED_MODIFY_DATA_POINTER: | |
fc25307d | 1173 | print_ptr(msg, 3, "pointer"); |
410ca5c7 MW |
1174 | break; |
1175 | case EXTENDED_SDTR: | |
ef72582e | 1176 | print_nego(msg, 3, 4, 0); |
410ca5c7 MW |
1177 | break; |
1178 | case EXTENDED_WDTR: | |
ef72582e MW |
1179 | print_nego(msg, 0, 0, 3); |
1180 | break; | |
1181 | case EXTENDED_PPR: | |
1182 | print_nego(msg, 3, 5, 6); | |
410ca5c7 | 1183 | break; |
fc25307d MW |
1184 | case EXTENDED_MODIFY_BIDI_DATA_PTR: |
1185 | print_ptr(msg, 3, "out"); | |
1186 | print_ptr(msg, 7, "in"); | |
1187 | break; | |
410ca5c7 MW |
1188 | default: |
1189 | for (i = 2; i < len; ++i) | |
1190 | printk("%02x ", msg[i]); | |
1191 | } | |
1192 | /* Identify */ | |
1193 | } else if (msg[0] & 0x80) { | |
1194 | printk("Identify disconnect %sallowed %s %d ", | |
1195 | (msg[0] & 0x40) ? "" : "not ", | |
1196 | (msg[0] & 0x20) ? "target routine" : "lun", | |
1197 | msg[0] & 0x7); | |
410ca5c7 MW |
1198 | /* Normal One byte */ |
1199 | } else if (msg[0] < 0x1f) { | |
72df0ebf | 1200 | if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]]) |
e24d873d | 1201 | printk("%s ", one_byte_msgs[msg[0]]); |
410ca5c7 MW |
1202 | else |
1203 | printk("reserved (%02x) ", msg[0]); | |
72df0ebf MW |
1204 | } else if (msg[0] == 0x55) { |
1205 | printk("QAS Request "); | |
410ca5c7 MW |
1206 | /* Two byte */ |
1207 | } else if (msg[0] <= 0x2f) { | |
b32aaffc | 1208 | if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs)) |
410ca5c7 MW |
1209 | printk("%s %02x ", two_byte_msgs[msg[0] - 0x20], |
1210 | msg[1]); | |
1211 | else | |
1212 | printk("reserved two byte (%02x %02x) ", | |
1213 | msg[0], msg[1]); | |
1214 | len = 2; | |
1215 | } else | |
e24d873d | 1216 | printk("reserved "); |
410ca5c7 MW |
1217 | return len; |
1218 | } | |
1abfd370 | 1219 | EXPORT_SYMBOL(spi_print_msg); |
410ca5c7 MW |
1220 | |
1221 | #else /* ifndef CONFIG_SCSI_CONSTANTS */ | |
1222 | ||
1abfd370 | 1223 | int spi_print_msg(const unsigned char *msg) |
410ca5c7 | 1224 | { |
72df0ebf | 1225 | int len = 1, i; |
410ca5c7 MW |
1226 | |
1227 | if (msg[0] == EXTENDED_MESSAGE) { | |
fc25307d MW |
1228 | len = 2 + msg[1]; |
1229 | if (len == 2) | |
1230 | len += 256; | |
410ca5c7 MW |
1231 | for (i = 0; i < len; ++i) |
1232 | printk("%02x ", msg[i]); | |
1233 | /* Identify */ | |
1234 | } else if (msg[0] & 0x80) { | |
1235 | printk("%02x ", msg[0]); | |
410ca5c7 | 1236 | /* Normal One byte */ |
597705aa | 1237 | } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) { |
410ca5c7 | 1238 | printk("%02x ", msg[0]); |
410ca5c7 MW |
1239 | /* Two byte */ |
1240 | } else if (msg[0] <= 0x2f) { | |
1241 | printk("%02x %02x", msg[0], msg[1]); | |
1242 | len = 2; | |
1243 | } else | |
1244 | printk("%02x ", msg[0]); | |
1245 | return len; | |
1246 | } | |
1abfd370 | 1247 | EXPORT_SYMBOL(spi_print_msg); |
410ca5c7 MW |
1248 | #endif /* ! CONFIG_SCSI_CONSTANTS */ |
1249 | ||
1da177e4 LT |
1250 | #define SETUP_ATTRIBUTE(field) \ |
1251 | i->private_attrs[count] = class_device_attr_##field; \ | |
1252 | if (!i->f->set_##field) { \ | |
1253 | i->private_attrs[count].attr.mode = S_IRUGO; \ | |
1254 | i->private_attrs[count].store = NULL; \ | |
1255 | } \ | |
1256 | i->attrs[count] = &i->private_attrs[count]; \ | |
1257 | if (i->f->show_##field) \ | |
1258 | count++ | |
1259 | ||
62a86129 JB |
1260 | #define SETUP_RELATED_ATTRIBUTE(field, rel_field) \ |
1261 | i->private_attrs[count] = class_device_attr_##field; \ | |
1262 | if (!i->f->set_##rel_field) { \ | |
1263 | i->private_attrs[count].attr.mode = S_IRUGO; \ | |
1264 | i->private_attrs[count].store = NULL; \ | |
1265 | } \ | |
1266 | i->attrs[count] = &i->private_attrs[count]; \ | |
1267 | if (i->f->show_##rel_field) \ | |
1268 | count++ | |
1269 | ||
1da177e4 LT |
1270 | #define SETUP_HOST_ATTRIBUTE(field) \ |
1271 | i->private_host_attrs[count] = class_device_attr_##field; \ | |
1272 | if (!i->f->set_##field) { \ | |
1273 | i->private_host_attrs[count].attr.mode = S_IRUGO; \ | |
1274 | i->private_host_attrs[count].store = NULL; \ | |
1275 | } \ | |
1276 | i->host_attrs[count] = &i->private_host_attrs[count]; \ | |
1277 | count++ | |
1278 | ||
1279 | static int spi_device_match(struct attribute_container *cont, | |
1280 | struct device *dev) | |
1281 | { | |
1282 | struct scsi_device *sdev; | |
1283 | struct Scsi_Host *shost; | |
10c1b889 | 1284 | struct spi_internal *i; |
1da177e4 LT |
1285 | |
1286 | if (!scsi_is_sdev_device(dev)) | |
1287 | return 0; | |
1288 | ||
1289 | sdev = to_scsi_device(dev); | |
1290 | shost = sdev->host; | |
1291 | if (!shost->transportt || shost->transportt->host_attrs.ac.class | |
1292 | != &spi_host_class.class) | |
1293 | return 0; | |
1294 | /* Note: this class has no device attributes, so it has | |
1295 | * no per-HBA allocation and thus we don't need to distinguish | |
1296 | * the attribute containers for the device */ | |
10c1b889 JB |
1297 | i = to_spi_internal(shost->transportt); |
1298 | if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target)) | |
1299 | return 0; | |
1da177e4 LT |
1300 | return 1; |
1301 | } | |
1302 | ||
1303 | static int spi_target_match(struct attribute_container *cont, | |
1304 | struct device *dev) | |
1305 | { | |
1306 | struct Scsi_Host *shost; | |
10c1b889 | 1307 | struct scsi_target *starget; |
1da177e4 LT |
1308 | struct spi_internal *i; |
1309 | ||
1310 | if (!scsi_is_target_device(dev)) | |
1311 | return 0; | |
1312 | ||
1313 | shost = dev_to_shost(dev->parent); | |
1314 | if (!shost->transportt || shost->transportt->host_attrs.ac.class | |
1315 | != &spi_host_class.class) | |
1316 | return 0; | |
1317 | ||
1318 | i = to_spi_internal(shost->transportt); | |
10c1b889 JB |
1319 | starget = to_scsi_target(dev); |
1320 | ||
1321 | if (i->f->deny_binding && i->f->deny_binding(starget)) | |
1322 | return 0; | |
1323 | ||
1da177e4 LT |
1324 | return &i->t.target_attrs.ac == cont; |
1325 | } | |
1326 | ||
1327 | static DECLARE_TRANSPORT_CLASS(spi_transport_class, | |
1328 | "spi_transport", | |
1329 | spi_setup_transport_attrs, | |
1330 | NULL, | |
1331 | NULL); | |
1332 | ||
1333 | static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class, | |
1334 | spi_device_match, | |
1335 | spi_device_configure); | |
1336 | ||
1337 | struct scsi_transport_template * | |
1338 | spi_attach_transport(struct spi_function_template *ft) | |
1339 | { | |
1da177e4 | 1340 | int count = 0; |
24669f75 JS |
1341 | struct spi_internal *i = kzalloc(sizeof(struct spi_internal), |
1342 | GFP_KERNEL); | |
1343 | ||
1da177e4 LT |
1344 | if (unlikely(!i)) |
1345 | return NULL; | |
1346 | ||
1da177e4 LT |
1347 | i->t.target_attrs.ac.class = &spi_transport_class.class; |
1348 | i->t.target_attrs.ac.attrs = &i->attrs[0]; | |
1349 | i->t.target_attrs.ac.match = spi_target_match; | |
1350 | transport_container_register(&i->t.target_attrs); | |
1351 | i->t.target_size = sizeof(struct spi_transport_attrs); | |
1352 | i->t.host_attrs.ac.class = &spi_host_class.class; | |
1353 | i->t.host_attrs.ac.attrs = &i->host_attrs[0]; | |
1354 | i->t.host_attrs.ac.match = spi_host_match; | |
1355 | transport_container_register(&i->t.host_attrs); | |
1356 | i->t.host_size = sizeof(struct spi_host_attrs); | |
1357 | i->f = ft; | |
1358 | ||
1359 | SETUP_ATTRIBUTE(period); | |
62a86129 | 1360 | SETUP_RELATED_ATTRIBUTE(min_period, period); |
1da177e4 | 1361 | SETUP_ATTRIBUTE(offset); |
62a86129 | 1362 | SETUP_RELATED_ATTRIBUTE(max_offset, offset); |
1da177e4 | 1363 | SETUP_ATTRIBUTE(width); |
62a86129 | 1364 | SETUP_RELATED_ATTRIBUTE(max_width, width); |
1da177e4 LT |
1365 | SETUP_ATTRIBUTE(iu); |
1366 | SETUP_ATTRIBUTE(dt); | |
1367 | SETUP_ATTRIBUTE(qas); | |
1368 | SETUP_ATTRIBUTE(wr_flow); | |
1369 | SETUP_ATTRIBUTE(rd_strm); | |
1370 | SETUP_ATTRIBUTE(rti); | |
1371 | SETUP_ATTRIBUTE(pcomp_en); | |
d872ebe4 | 1372 | SETUP_ATTRIBUTE(hold_mcs); |
1da177e4 LT |
1373 | |
1374 | /* if you add an attribute but forget to increase SPI_NUM_ATTRS | |
1375 | * this bug will trigger */ | |
1376 | BUG_ON(count > SPI_NUM_ATTRS); | |
1377 | ||
1378 | i->attrs[count++] = &class_device_attr_revalidate; | |
1379 | ||
1380 | i->attrs[count] = NULL; | |
1381 | ||
1382 | count = 0; | |
1383 | SETUP_HOST_ATTRIBUTE(signalling); | |
1384 | ||
1385 | BUG_ON(count > SPI_HOST_ATTRS); | |
1386 | ||
1387 | i->host_attrs[count] = NULL; | |
1388 | ||
1389 | return &i->t; | |
1390 | } | |
1391 | EXPORT_SYMBOL(spi_attach_transport); | |
1392 | ||
1393 | void spi_release_transport(struct scsi_transport_template *t) | |
1394 | { | |
1395 | struct spi_internal *i = to_spi_internal(t); | |
1396 | ||
1397 | transport_container_unregister(&i->t.target_attrs); | |
1398 | transport_container_unregister(&i->t.host_attrs); | |
1399 | ||
1400 | kfree(i); | |
1401 | } | |
1402 | EXPORT_SYMBOL(spi_release_transport); | |
1403 | ||
1404 | static __init int spi_transport_init(void) | |
1405 | { | |
1406 | int error = transport_class_register(&spi_transport_class); | |
1407 | if (error) | |
1408 | return error; | |
1409 | error = anon_transport_class_register(&spi_device_class); | |
1410 | return transport_class_register(&spi_host_class); | |
1411 | } | |
1412 | ||
1413 | static void __exit spi_transport_exit(void) | |
1414 | { | |
1415 | transport_class_unregister(&spi_transport_class); | |
1416 | anon_transport_class_unregister(&spi_device_class); | |
1417 | transport_class_unregister(&spi_host_class); | |
1418 | } | |
1419 | ||
1420 | MODULE_AUTHOR("Martin Hicks"); | |
1421 | MODULE_DESCRIPTION("SPI Transport Attributes"); | |
1422 | MODULE_LICENSE("GPL"); | |
1423 | ||
1424 | module_init(spi_transport_init); | |
1425 | module_exit(spi_transport_exit); |