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Merge branch 'core/header-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6/mini2440.git] / drivers / scsi / ses.c
blobe946e05db7f72917fb372da520ebb22260e03e23
1 /*
2 * SCSI Enclosure Services
3 *
4 * Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
5 *
6 **-----------------------------------------------------------------------------
7 **
8 ** This program is free software; you can redistribute it and/or
9 ** modify it under the terms of the GNU General Public License
10 ** version 2 as published by the Free Software Foundation.
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., 675 Mass Ave, Cambridge, MA 02139, USA.
20 **
21 **-----------------------------------------------------------------------------
22 */
23
24 #include <linux/module.h>
25 #include <linux/kernel.h>
26 #include <linux/enclosure.h>
27
28 #include <scsi/scsi.h>
29 #include <scsi/scsi_cmnd.h>
30 #include <scsi/scsi_dbg.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_driver.h>
33 #include <scsi/scsi_host.h>
34
35 struct ses_device {
36 unsigned char *page1;
37 unsigned char *page2;
38 unsigned char *page10;
39 short page1_len;
40 short page2_len;
41 short page10_len;
42 };
43
44 struct ses_component {
45 u64 addr;
46 unsigned char *desc;
47 };
48
49 static int ses_probe(struct device *dev)
50 {
51 struct scsi_device *sdev = to_scsi_device(dev);
52 int err = -ENODEV;
53
54 if (sdev->type != TYPE_ENCLOSURE)
55 goto out;
56
57 err = 0;
58 sdev_printk(KERN_NOTICE, sdev, "Attached Enclosure device\n");
59
60 out:
61 return err;
62 }
63
64 #define SES_TIMEOUT (30 * HZ)
65 #define SES_RETRIES 3
66
67 static int ses_recv_diag(struct scsi_device *sdev, int page_code,
68 void *buf, int bufflen)
69 {
70 unsigned char cmd[] = {
71 RECEIVE_DIAGNOSTIC,
72 1, /* Set PCV bit */
73 page_code,
74 bufflen >> 8,
75 bufflen & 0xff,
76 0
77 };
78
79 return scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, bufflen,
80 NULL, SES_TIMEOUT, SES_RETRIES, NULL);
81 }
82
83 static int ses_send_diag(struct scsi_device *sdev, int page_code,
84 void *buf, int bufflen)
85 {
86 u32 result;
87
88 unsigned char cmd[] = {
89 SEND_DIAGNOSTIC,
90 0x10, /* Set PF bit */
91 0,
92 bufflen >> 8,
93 bufflen & 0xff,
94 0
95 };
96
97 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, buf, bufflen,
98 NULL, SES_TIMEOUT, SES_RETRIES, NULL);
99 if (result)
100 sdev_printk(KERN_ERR, sdev, "SEND DIAGNOSTIC result: %8x\n",
101 result);
102 return result;
103 }
104
105 static int ses_set_page2_descriptor(struct enclosure_device *edev,
106 struct enclosure_component *ecomp,
107 unsigned char *desc)
108 {
109 int i, j, count = 0, descriptor = ecomp->number;
110 struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
111 struct ses_device *ses_dev = edev->scratch;
112 unsigned char *type_ptr = ses_dev->page1 + 12 + ses_dev->page1[11];
113 unsigned char *desc_ptr = ses_dev->page2 + 8;
114
115 /* Clear everything */
116 memset(desc_ptr, 0, ses_dev->page2_len - 8);
117 for (i = 0; i < ses_dev->page1[10]; i++, type_ptr += 4) {
118 for (j = 0; j < type_ptr[1]; j++) {
119 desc_ptr += 4;
120 if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
121 type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
122 continue;
123 if (count++ == descriptor) {
124 memcpy(desc_ptr, desc, 4);
125 /* set select */
126 desc_ptr[0] |= 0x80;
127 /* clear reserved, just in case */
128 desc_ptr[0] &= 0xf0;
129 }
130 }
131 }
132
133 return ses_send_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
134 }
135
136 static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev,
137 struct enclosure_component *ecomp)
138 {
139 int i, j, count = 0, descriptor = ecomp->number;
140 struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
141 struct ses_device *ses_dev = edev->scratch;
142 unsigned char *type_ptr = ses_dev->page1 + 12 + ses_dev->page1[11];
143 unsigned char *desc_ptr = ses_dev->page2 + 8;
144
145 ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
146
147 for (i = 0; i < ses_dev->page1[10]; i++, type_ptr += 4) {
148 for (j = 0; j < type_ptr[1]; j++) {
149 desc_ptr += 4;
150 if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
151 type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
152 continue;
153 if (count++ == descriptor)
154 return desc_ptr;
155 }
156 }
157 return NULL;
158 }
159
160 static void ses_get_fault(struct enclosure_device *edev,
161 struct enclosure_component *ecomp)
162 {
163 unsigned char *desc;
164
165 desc = ses_get_page2_descriptor(edev, ecomp);
166 if (desc)
167 ecomp->fault = (desc[3] & 0x60) >> 4;
168 }
169
170 static int ses_set_fault(struct enclosure_device *edev,
171 struct enclosure_component *ecomp,
172 enum enclosure_component_setting val)
173 {
174 unsigned char desc[4] = {0 };
175
176 switch (val) {
177 case ENCLOSURE_SETTING_DISABLED:
178 /* zero is disabled */
179 break;
180 case ENCLOSURE_SETTING_ENABLED:
181 desc[2] = 0x02;
182 break;
183 default:
184 /* SES doesn't do the SGPIO blink settings */
185 return -EINVAL;
186 }
187
188 return ses_set_page2_descriptor(edev, ecomp, desc);
189 }
190
191 static void ses_get_status(struct enclosure_device *edev,
192 struct enclosure_component *ecomp)
193 {
194 unsigned char *desc;
195
196 desc = ses_get_page2_descriptor(edev, ecomp);
197 if (desc)
198 ecomp->status = (desc[0] & 0x0f);
199 }
200
201 static void ses_get_locate(struct enclosure_device *edev,
202 struct enclosure_component *ecomp)
203 {
204 unsigned char *desc;
205
206 desc = ses_get_page2_descriptor(edev, ecomp);
207 if (desc)
208 ecomp->locate = (desc[2] & 0x02) ? 1 : 0;
209 }
210
211 static int ses_set_locate(struct enclosure_device *edev,
212 struct enclosure_component *ecomp,
213 enum enclosure_component_setting val)
214 {
215 unsigned char desc[4] = {0 };
216
217 switch (val) {
218 case ENCLOSURE_SETTING_DISABLED:
219 /* zero is disabled */
220 break;
221 case ENCLOSURE_SETTING_ENABLED:
222 desc[2] = 0x02;
223 break;
224 default:
225 /* SES doesn't do the SGPIO blink settings */
226 return -EINVAL;
227 }
228 return ses_set_page2_descriptor(edev, ecomp, desc);
229 }
230
231 static int ses_set_active(struct enclosure_device *edev,
232 struct enclosure_component *ecomp,
233 enum enclosure_component_setting val)
234 {
235 unsigned char desc[4] = {0 };
236
237 switch (val) {
238 case ENCLOSURE_SETTING_DISABLED:
239 /* zero is disabled */
240 ecomp->active = 0;
241 break;
242 case ENCLOSURE_SETTING_ENABLED:
243 desc[2] = 0x80;
244 ecomp->active = 1;
245 break;
246 default:
247 /* SES doesn't do the SGPIO blink settings */
248 return -EINVAL;
249 }
250 return ses_set_page2_descriptor(edev, ecomp, desc);
251 }
252
253 static struct enclosure_component_callbacks ses_enclosure_callbacks = {
254 .get_fault = ses_get_fault,
255 .set_fault = ses_set_fault,
256 .get_status = ses_get_status,
257 .get_locate = ses_get_locate,
258 .set_locate = ses_set_locate,
259 .set_active = ses_set_active,
260 };
261
262 struct ses_host_edev {
263 struct Scsi_Host *shost;
264 struct enclosure_device *edev;
265 };
266
267 int ses_match_host(struct enclosure_device *edev, void *data)
268 {
269 struct ses_host_edev *sed = data;
270 struct scsi_device *sdev;
271
272 if (!scsi_is_sdev_device(edev->edev.parent))
273 return 0;
274
275 sdev = to_scsi_device(edev->edev.parent);
276
277 if (sdev->host != sed->shost)
278 return 0;
279
280 sed->edev = edev;
281 return 1;
282 }
283
284 static void ses_process_descriptor(struct enclosure_component *ecomp,
285 unsigned char *desc)
286 {
287 int eip = desc[0] & 0x10;
288 int invalid = desc[0] & 0x80;
289 enum scsi_protocol proto = desc[0] & 0x0f;
290 u64 addr = 0;
291 struct ses_component *scomp = ecomp->scratch;
292 unsigned char *d;
293
294 scomp->desc = desc;
295
296 if (invalid)
297 return;
298
299 switch (proto) {
300 case SCSI_PROTOCOL_SAS:
301 if (eip)
302 d = desc + 8;
303 else
304 d = desc + 4;
305 /* only take the phy0 addr */
306 addr = (u64)d[12] << 56 |
307 (u64)d[13] << 48 |
308 (u64)d[14] << 40 |
309 (u64)d[15] << 32 |
310 (u64)d[16] << 24 |
311 (u64)d[17] << 16 |
312 (u64)d[18] << 8 |
313 (u64)d[19];
314 break;
315 default:
316 /* FIXME: Need to add more protocols than just SAS */
317 break;
318 }
319 scomp->addr = addr;
320 }
321
322 struct efd {
323 u64 addr;
324 struct device *dev;
325 };
326
327 static int ses_enclosure_find_by_addr(struct enclosure_device *edev,
328 void *data)
329 {
330 struct efd *efd = data;
331 int i;
332 struct ses_component *scomp;
333
334 if (!edev->component[0].scratch)
335 return 0;
336
337 for (i = 0; i < edev->components; i++) {
338 scomp = edev->component[i].scratch;
339 if (scomp->addr != efd->addr)
340 continue;
341
342 enclosure_add_device(edev, i, efd->dev);
343 return 1;
344 }
345 return 0;
346 }
347
348 #define VPD_INQUIRY_SIZE 36
349
350 static void ses_match_to_enclosure(struct enclosure_device *edev,
351 struct scsi_device *sdev)
352 {
353 unsigned char *buf = kmalloc(VPD_INQUIRY_SIZE, GFP_KERNEL);
354 unsigned char *desc;
355 u16 vpd_len;
356 struct efd efd = {
357 .addr = 0,
358 };
359 unsigned char cmd[] = {
360 INQUIRY,
361 1,
362 0x83,
363 VPD_INQUIRY_SIZE >> 8,
364 VPD_INQUIRY_SIZE & 0xff,
365 0
366 };
367
368 if (!buf)
369 return;
370
371 if (scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf,
372 VPD_INQUIRY_SIZE, NULL, SES_TIMEOUT, SES_RETRIES,
373 NULL))
374 goto free;
375
376 vpd_len = (buf[2] << 8) + buf[3];
377 kfree(buf);
378 buf = kmalloc(vpd_len, GFP_KERNEL);
379 if (!buf)
380 return;
381 cmd[3] = vpd_len >> 8;
382 cmd[4] = vpd_len & 0xff;
383 if (scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf,
384 vpd_len, NULL, SES_TIMEOUT, SES_RETRIES, NULL))
385 goto free;
386
387 desc = buf + 4;
388 while (desc < buf + vpd_len) {
389 enum scsi_protocol proto = desc[0] >> 4;
390 u8 code_set = desc[0] & 0x0f;
391 u8 piv = desc[1] & 0x80;
392 u8 assoc = (desc[1] & 0x30) >> 4;
393 u8 type = desc[1] & 0x0f;
394 u8 len = desc[3];
395
396 if (piv && code_set == 1 && assoc == 1 && code_set == 1
397 && proto == SCSI_PROTOCOL_SAS && type == 3 && len == 8)
398 efd.addr = (u64)desc[4] << 56 |
399 (u64)desc[5] << 48 |
400 (u64)desc[6] << 40 |
401 (u64)desc[7] << 32 |
402 (u64)desc[8] << 24 |
403 (u64)desc[9] << 16 |
404 (u64)desc[10] << 8 |
405 (u64)desc[11];
406
407 desc += len + 4;
408 }
409 if (!efd.addr)
410 goto free;
411
412 efd.dev = &sdev->sdev_gendev;
413
414 enclosure_for_each_device(ses_enclosure_find_by_addr, &efd);
415 free:
416 kfree(buf);
417 }
418
419 #define INIT_ALLOC_SIZE 32
420
421 static int ses_intf_add(struct device *cdev,
422 struct class_interface *intf)
423 {
424 struct scsi_device *sdev = to_scsi_device(cdev->parent);
425 struct scsi_device *tmp_sdev;
426 unsigned char *buf = NULL, *hdr_buf, *type_ptr, *desc_ptr = NULL,
427 *addl_desc_ptr = NULL;
428 struct ses_device *ses_dev;
429 u32 result;
430 int i, j, types, len, page7_len = 0, components = 0;
431 int err = -ENOMEM;
432 struct enclosure_device *edev;
433 struct ses_component *scomp = NULL;
434
435 if (!scsi_device_enclosure(sdev)) {
436 /* not an enclosure, but might be in one */
437 edev = enclosure_find(&sdev->host->shost_gendev);
438 if (edev) {
439 ses_match_to_enclosure(edev, sdev);
440 put_device(&edev->edev);
441 }
442 return -ENODEV;
443 }
444
445 /* TYPE_ENCLOSURE prints a message in probe */
446 if (sdev->type != TYPE_ENCLOSURE)
447 sdev_printk(KERN_NOTICE, sdev, "Embedded Enclosure Device\n");
448
449 ses_dev = kzalloc(sizeof(*ses_dev), GFP_KERNEL);
450 hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
451 if (!hdr_buf || !ses_dev)
452 goto err_init_free;
453
454 result = ses_recv_diag(sdev, 1, hdr_buf, INIT_ALLOC_SIZE);
455 if (result)
456 goto recv_failed;
457
458 if (hdr_buf[1] != 0) {
459 /* FIXME: need subenclosure support; I've just never
460 * seen a device with subenclosures and it makes the
461 * traversal routines more complex */
462 sdev_printk(KERN_ERR, sdev,
463 "FIXME driver has no support for subenclosures (%d)\n",
464 hdr_buf[1]);
465 goto err_free;
466 }
467
468 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
469 buf = kzalloc(len, GFP_KERNEL);
470 if (!buf)
471 goto err_free;
472
473 result = ses_recv_diag(sdev, 1, buf, len);
474 if (result)
475 goto recv_failed;
476
477 types = buf[10];
478
479 type_ptr = buf + 12 + buf[11];
480
481 for (i = 0; i < types; i++, type_ptr += 4) {
482 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
483 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE)
484 components += type_ptr[1];
485 }
486 ses_dev->page1 = buf;
487 ses_dev->page1_len = len;
488 buf = NULL;
489
490 result = ses_recv_diag(sdev, 2, hdr_buf, INIT_ALLOC_SIZE);
491 if (result)
492 goto recv_failed;
493
494 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
495 buf = kzalloc(len, GFP_KERNEL);
496 if (!buf)
497 goto err_free;
498
499 /* make sure getting page 2 actually works */
500 result = ses_recv_diag(sdev, 2, buf, len);
501 if (result)
502 goto recv_failed;
503 ses_dev->page2 = buf;
504 ses_dev->page2_len = len;
505 buf = NULL;
506
507 /* The additional information page --- allows us
508 * to match up the devices */
509 result = ses_recv_diag(sdev, 10, hdr_buf, INIT_ALLOC_SIZE);
510 if (!result) {
511
512 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
513 buf = kzalloc(len, GFP_KERNEL);
514 if (!buf)
515 goto err_free;
516
517 result = ses_recv_diag(sdev, 10, buf, len);
518 if (result)
519 goto recv_failed;
520 ses_dev->page10 = buf;
521 ses_dev->page10_len = len;
522 buf = NULL;
523 }
524
525 scomp = kzalloc(sizeof(struct ses_component) * components, GFP_KERNEL);
526 if (!scomp)
527 goto err_free;
528
529 edev = enclosure_register(cdev->parent, dev_name(&sdev->sdev_gendev),
530 components, &ses_enclosure_callbacks);
531 if (IS_ERR(edev)) {
532 err = PTR_ERR(edev);
533 goto err_free;
534 }
535
536 edev->scratch = ses_dev;
537 for (i = 0; i < components; i++)
538 edev->component[i].scratch = scomp + i;
539
540 /* Page 7 for the descriptors is optional */
541 result = ses_recv_diag(sdev, 7, hdr_buf, INIT_ALLOC_SIZE);
542 if (result)
543 goto simple_populate;
544
545 page7_len = len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
546 /* add 1 for trailing '\0' we'll use */
547 buf = kzalloc(len + 1, GFP_KERNEL);
548 if (!buf)
549 goto simple_populate;
550 result = ses_recv_diag(sdev, 7, buf, len);
551 if (result) {
552 simple_populate:
553 kfree(buf);
554 buf = NULL;
555 desc_ptr = NULL;
556 addl_desc_ptr = NULL;
557 } else {
558 desc_ptr = buf + 8;
559 len = (desc_ptr[2] << 8) + desc_ptr[3];
560 /* skip past overall descriptor */
561 desc_ptr += len + 4;
562 if (ses_dev->page10)
563 addl_desc_ptr = ses_dev->page10 + 8;
564 }
565 type_ptr = ses_dev->page1 + 12 + ses_dev->page1[11];
566 components = 0;
567 for (i = 0; i < types; i++, type_ptr += 4) {
568 for (j = 0; j < type_ptr[1]; j++) {
569 char *name = NULL;
570 struct enclosure_component *ecomp;
571
572 if (desc_ptr) {
573 if (desc_ptr >= buf + page7_len) {
574 desc_ptr = NULL;
575 } else {
576 len = (desc_ptr[2] << 8) + desc_ptr[3];
577 desc_ptr += 4;
578 /* Add trailing zero - pushes into
579 * reserved space */
580 desc_ptr[len] = '\0';
581 name = desc_ptr;
582 }
583 }
584 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
585 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) {
586
587 ecomp = enclosure_component_register(edev,
588 components++,
589 type_ptr[0],
590 name);
591
592 if (!IS_ERR(ecomp) && addl_desc_ptr)
593 ses_process_descriptor(ecomp,
594 addl_desc_ptr);
595 }
596 if (desc_ptr)
597 desc_ptr += len;
598
599 if (addl_desc_ptr)
600 addl_desc_ptr += addl_desc_ptr[1] + 2;
601
602 }
603 }
604 kfree(buf);
605 kfree(hdr_buf);
606
607 /* see if there are any devices matching before
608 * we found the enclosure */
609 shost_for_each_device(tmp_sdev, sdev->host) {
610 if (tmp_sdev->lun != 0 || scsi_device_enclosure(tmp_sdev))
611 continue;
612 ses_match_to_enclosure(edev, tmp_sdev);
613 }
614
615 return 0;
616
617 recv_failed:
618 sdev_printk(KERN_ERR, sdev, "Failed to get diagnostic page 0x%x\n",
619 result);
620 err = -ENODEV;
621 err_free:
622 kfree(buf);
623 kfree(scomp);
624 kfree(ses_dev->page10);
625 kfree(ses_dev->page2);
626 kfree(ses_dev->page1);
627 err_init_free:
628 kfree(ses_dev);
629 kfree(hdr_buf);
630 sdev_printk(KERN_ERR, sdev, "Failed to bind enclosure %d\n", err);
631 return err;
632 }
633
634 static int ses_remove(struct device *dev)
635 {
636 return 0;
637 }
638
639 static void ses_intf_remove(struct device *cdev,
640 struct class_interface *intf)
641 {
642 struct scsi_device *sdev = to_scsi_device(cdev->parent);
643 struct enclosure_device *edev;
644 struct ses_device *ses_dev;
645
646 if (!scsi_device_enclosure(sdev))
647 return;
648
649 edev = enclosure_find(cdev->parent);
650 if (!edev)
651 return;
652
653 ses_dev = edev->scratch;
654 edev->scratch = NULL;
655
656 kfree(ses_dev->page10);
657 kfree(ses_dev->page1);
658 kfree(ses_dev->page2);
659 kfree(ses_dev);
660
661 kfree(edev->component[0].scratch);
662
663 put_device(&edev->edev);
664 enclosure_unregister(edev);
665 }
666
667 static struct class_interface ses_interface = {
668 .add_dev = ses_intf_add,
669 .remove_dev = ses_intf_remove,
670 };
671
672 static struct scsi_driver ses_template = {
673 .owner = THIS_MODULE,
674 .gendrv = {
675 .name = "ses",
676 .probe = ses_probe,
677 .remove = ses_remove,
678 },
679 };
680
681 static int __init ses_init(void)
682 {
683 int err;
684
685 err = scsi_register_interface(&ses_interface);
686 if (err)
687 return err;
688
689 err = scsi_register_driver(&ses_template.gendrv);
690 if (err)
691 goto out_unreg;
692
693 return 0;
694
695 out_unreg:
696 scsi_unregister_interface(&ses_interface);
697 return err;
698 }
699
700 static void __exit ses_exit(void)
701 {
702 scsi_unregister_driver(&ses_template.gendrv);
703 scsi_unregister_interface(&ses_interface);
704 }
705
706 module_init(ses_init);
707 module_exit(ses_exit);
708
709 MODULE_ALIAS_SCSI_DEVICE(TYPE_ENCLOSURE);
710
711 MODULE_AUTHOR("James Bottomley");
712 MODULE_DESCRIPTION("SCSI Enclosure Services (ses) driver");
713 MODULE_LICENSE("GPL v2");
Support for the Chinese Samsung S3C2440 based development boards