]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/mmc/core/sd.c
projects / mirror_ubuntu-artful-kernel.git / blob
? search:


d18c32bca99bae78fe3b0f04d22c2f124ce86cb5
[mirror_ubuntu-artful-kernel.git] / drivers / mmc / core / sd.c
1 /*
2 * linux/drivers/mmc/core/sd.c
3 *
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/err.h>
14 #include <linux/slab.h>
15
16 #include <linux/mmc/host.h>
17 #include <linux/mmc/card.h>
18 #include <linux/mmc/mmc.h>
19 #include <linux/mmc/sd.h>
20
21 #include "core.h"
22 #include "bus.h"
23 #include "mmc_ops.h"
24 #include "sd_ops.h"
25
26 static const unsigned int tran_exp[] = {
27 10000, 100000, 1000000, 10000000,
28 0, 0, 0, 0
29 };
30
31 static const unsigned char tran_mant[] = {
32 0, 10, 12, 13, 15, 20, 25, 30,
33 35, 40, 45, 50, 55, 60, 70, 80,
34 };
35
36 static const unsigned int tacc_exp[] = {
37 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
38 };
39
40 static const unsigned int tacc_mant[] = {
41 0, 10, 12, 13, 15, 20, 25, 30,
42 35, 40, 45, 50, 55, 60, 70, 80,
43 };
44
45 #define UNSTUFF_BITS(resp,start,size) \
46 ({ \
47 const int __size = size; \
48 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
49 const int __off = 3 - ((start) / 32); \
50 const int __shft = (start) & 31; \
51 u32 __res; \
52 \
53 __res = resp[__off] >> __shft; \
54 if (__size + __shft > 32) \
55 __res |= resp[__off-1] << ((32 - __shft) % 32); \
56 __res & __mask; \
57 })
58
59 /*
60 * Given the decoded CSD structure, decode the raw CID to our CID structure.
61 */
62 void mmc_decode_cid(struct mmc_card *card)
63 {
64 u32 *resp = card->raw_cid;
65
66 memset(&card->cid, 0, sizeof(struct mmc_cid));
67
68 /*
69 * SD doesn't currently have a version field so we will
70 * have to assume we can parse this.
71 */
72 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
73 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
74 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
75 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
76 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
77 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
78 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
79 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
80 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
81 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
82 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
83 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
84
85 card->cid.year += 2000; /* SD cards year offset */
86 }
87
88 /*
89 * Given a 128-bit response, decode to our card CSD structure.
90 */
91 static int mmc_decode_csd(struct mmc_card *card)
92 {
93 struct mmc_csd *csd = &card->csd;
94 unsigned int e, m, csd_struct;
95 u32 *resp = card->raw_csd;
96
97 csd_struct = UNSTUFF_BITS(resp, 126, 2);
98
99 switch (csd_struct) {
100 case 0:
101 m = UNSTUFF_BITS(resp, 115, 4);
102 e = UNSTUFF_BITS(resp, 112, 3);
103 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
104 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
105
106 m = UNSTUFF_BITS(resp, 99, 4);
107 e = UNSTUFF_BITS(resp, 96, 3);
108 csd->max_dtr = tran_exp[e] * tran_mant[m];
109 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
110
111 e = UNSTUFF_BITS(resp, 47, 3);
112 m = UNSTUFF_BITS(resp, 62, 12);
113 csd->capacity = (1 + m) << (e + 2);
114
115 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
116 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
117 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
118 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
119 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
120 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
121 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
122
123 if (UNSTUFF_BITS(resp, 46, 1)) {
124 csd->erase_size = 1;
125 } else if (csd->write_blkbits >= 9) {
126 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
127 csd->erase_size <<= csd->write_blkbits - 9;
128 }
129 break;
130 case 1:
131 /*
132 * This is a block-addressed SDHC card. Most
133 * interesting fields are unused and have fixed
134 * values. To avoid getting tripped by buggy cards,
135 * we assume those fixed values ourselves.
136 */
137 mmc_card_set_blockaddr(card);
138
139 csd->tacc_ns = 0; /* Unused */
140 csd->tacc_clks = 0; /* Unused */
141
142 m = UNSTUFF_BITS(resp, 99, 4);
143 e = UNSTUFF_BITS(resp, 96, 3);
144 csd->max_dtr = tran_exp[e] * tran_mant[m];
145 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
146
147 m = UNSTUFF_BITS(resp, 48, 22);
148 csd->capacity = (1 + m) << 10;
149
150 csd->read_blkbits = 9;
151 csd->read_partial = 0;
152 csd->write_misalign = 0;
153 csd->read_misalign = 0;
154 csd->r2w_factor = 4; /* Unused */
155 csd->write_blkbits = 9;
156 csd->write_partial = 0;
157 csd->erase_size = 1;
158 break;
159 default:
160 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
161 mmc_hostname(card->host), csd_struct);
162 return -EINVAL;
163 }
164
165 card->erase_size = csd->erase_size;
166
167 return 0;
168 }
169
170 /*
171 * Given a 64-bit response, decode to our card SCR structure.
172 */
173 static int mmc_decode_scr(struct mmc_card *card)
174 {
175 struct sd_scr *scr = &card->scr;
176 unsigned int scr_struct;
177 u32 resp[4];
178
179 resp[3] = card->raw_scr[1];
180 resp[2] = card->raw_scr[0];
181
182 scr_struct = UNSTUFF_BITS(resp, 60, 4);
183 if (scr_struct != 0) {
184 printk(KERN_ERR "%s: unrecognised SCR structure version %d\n",
185 mmc_hostname(card->host), scr_struct);
186 return -EINVAL;
187 }
188
189 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
190 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
191
192 if (UNSTUFF_BITS(resp, 55, 1))
193 card->erased_byte = 0xFF;
194 else
195 card->erased_byte = 0x0;
196
197 return 0;
198 }
199
200 /*
201 * Fetch and process SD Status register.
202 */
203 static int mmc_read_ssr(struct mmc_card *card)
204 {
205 unsigned int au, es, et, eo;
206 int err, i;
207 u32 *ssr;
208
209 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
210 printk(KERN_WARNING "%s: card lacks mandatory SD Status "
211 "function.\n", mmc_hostname(card->host));
212 return 0;
213 }
214
215 ssr = kmalloc(64, GFP_KERNEL);
216 if (!ssr)
217 return -ENOMEM;
218
219 err = mmc_app_sd_status(card, ssr);
220 if (err) {
221 printk(KERN_WARNING "%s: problem reading SD Status "
222 "register.\n", mmc_hostname(card->host));
223 err = 0;
224 goto out;
225 }
226
227 for (i = 0; i < 16; i++)
228 ssr[i] = be32_to_cpu(ssr[i]);
229
230 /*
231 * UNSTUFF_BITS only works with four u32s so we have to offset the
232 * bitfield positions accordingly.
233 */
234 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
235 if (au > 0 || au <= 9) {
236 card->ssr.au = 1 << (au + 4);
237 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
238 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
239 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
240 if (es && et) {
241 card->ssr.erase_timeout = (et * 1000) / es;
242 card->ssr.erase_offset = eo * 1000;
243 }
244 } else {
245 printk(KERN_WARNING "%s: SD Status: Invalid Allocation Unit "
246 "size.\n", mmc_hostname(card->host));
247 }
248 out:
249 kfree(ssr);
250 return err;
251 }
252
253 /*
254 * Fetches and decodes switch information
255 */
256 static int mmc_read_switch(struct mmc_card *card)
257 {
258 int err;
259 u8 *status;
260
261 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
262 return 0;
263
264 if (!(card->csd.cmdclass & CCC_SWITCH)) {
265 printk(KERN_WARNING "%s: card lacks mandatory switch "
266 "function, performance might suffer.\n",
267 mmc_hostname(card->host));
268 return 0;
269 }
270
271 err = -EIO;
272
273 status = kmalloc(64, GFP_KERNEL);
274 if (!status) {
275 printk(KERN_ERR "%s: could not allocate a buffer for "
276 "switch capabilities.\n", mmc_hostname(card->host));
277 return -ENOMEM;
278 }
279
280 err = mmc_sd_switch(card, 0, 0, 1, status);
281 if (err) {
282 /* If the host or the card can't do the switch,
283 * fail more gracefully. */
284 if ((err != -EINVAL)
285 && (err != -ENOSYS)
286 && (err != -EFAULT))
287 goto out;
288
289 printk(KERN_WARNING "%s: problem reading switch "
290 "capabilities, performance might suffer.\n",
291 mmc_hostname(card->host));
292 err = 0;
293
294 goto out;
295 }
296
297 if (status[13] & 0x02)
298 card->sw_caps.hs_max_dtr = 50000000;
299
300 out:
301 kfree(status);
302
303 return err;
304 }
305
306 /*
307 * Test if the card supports high-speed mode and, if so, switch to it.
308 */
309 int mmc_sd_switch_hs(struct mmc_card *card)
310 {
311 int err;
312 u8 *status;
313
314 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
315 return 0;
316
317 if (!(card->csd.cmdclass & CCC_SWITCH))
318 return 0;
319
320 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
321 return 0;
322
323 if (card->sw_caps.hs_max_dtr == 0)
324 return 0;
325
326 err = -EIO;
327
328 status = kmalloc(64, GFP_KERNEL);
329 if (!status) {
330 printk(KERN_ERR "%s: could not allocate a buffer for "
331 "switch capabilities.\n", mmc_hostname(card->host));
332 return -ENOMEM;
333 }
334
335 err = mmc_sd_switch(card, 1, 0, 1, status);
336 if (err)
337 goto out;
338
339 if ((status[16] & 0xF) != 1) {
340 printk(KERN_WARNING "%s: Problem switching card "
341 "into high-speed mode!\n",
342 mmc_hostname(card->host));
343 err = 0;
344 } else {
345 err = 1;
346 }
347
348 out:
349 kfree(status);
350
351 return err;
352 }
353
354 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
355 card->raw_cid[2], card->raw_cid[3]);
356 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
357 card->raw_csd[2], card->raw_csd[3]);
358 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
359 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
360 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
361 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
362 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
363 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
364 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
365 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
366 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
367 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
368
369
370 static struct attribute *sd_std_attrs[] = {
371 &dev_attr_cid.attr,
372 &dev_attr_csd.attr,
373 &dev_attr_scr.attr,
374 &dev_attr_date.attr,
375 &dev_attr_erase_size.attr,
376 &dev_attr_preferred_erase_size.attr,
377 &dev_attr_fwrev.attr,
378 &dev_attr_hwrev.attr,
379 &dev_attr_manfid.attr,
380 &dev_attr_name.attr,
381 &dev_attr_oemid.attr,
382 &dev_attr_serial.attr,
383 NULL,
384 };
385
386 static struct attribute_group sd_std_attr_group = {
387 .attrs = sd_std_attrs,
388 };
389
390 static const struct attribute_group *sd_attr_groups[] = {
391 &sd_std_attr_group,
392 NULL,
393 };
394
395 struct device_type sd_type = {
396 .groups = sd_attr_groups,
397 };
398
399 /*
400 * Fetch CID from card.
401 */
402 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid)
403 {
404 int err;
405
406 /*
407 * Since we're changing the OCR value, we seem to
408 * need to tell some cards to go back to the idle
409 * state. We wait 1ms to give cards time to
410 * respond.
411 */
412 mmc_go_idle(host);
413
414 /*
415 * If SD_SEND_IF_COND indicates an SD 2.0
416 * compliant card and we should set bit 30
417 * of the ocr to indicate that we can handle
418 * block-addressed SDHC cards.
419 */
420 err = mmc_send_if_cond(host, ocr);
421 if (!err)
422 ocr |= 1 << 30;
423
424 err = mmc_send_app_op_cond(host, ocr, NULL);
425 if (err)
426 return err;
427
428 if (mmc_host_is_spi(host))
429 err = mmc_send_cid(host, cid);
430 else
431 err = mmc_all_send_cid(host, cid);
432
433 return err;
434 }
435
436 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
437 {
438 int err;
439
440 /*
441 * Fetch CSD from card.
442 */
443 err = mmc_send_csd(card, card->raw_csd);
444 if (err)
445 return err;
446
447 err = mmc_decode_csd(card);
448 if (err)
449 return err;
450
451 return 0;
452 }
453
454 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
455 bool reinit)
456 {
457 int err;
458
459 if (!reinit) {
460 /*
461 * Fetch SCR from card.
462 */
463 err = mmc_app_send_scr(card, card->raw_scr);
464 if (err)
465 return err;
466
467 err = mmc_decode_scr(card);
468 if (err)
469 return err;
470
471 /*
472 * Fetch and process SD Status register.
473 */
474 err = mmc_read_ssr(card);
475 if (err)
476 return err;
477
478 /* Erase init depends on CSD and SSR */
479 mmc_init_erase(card);
480
481 /*
482 * Fetch switch information from card.
483 */
484 err = mmc_read_switch(card);
485 if (err)
486 return err;
487 }
488
489 /*
490 * For SPI, enable CRC as appropriate.
491 * This CRC enable is located AFTER the reading of the
492 * card registers because some SDHC cards are not able
493 * to provide valid CRCs for non-512-byte blocks.
494 */
495 if (mmc_host_is_spi(host)) {
496 err = mmc_spi_set_crc(host, use_spi_crc);
497 if (err)
498 return err;
499 }
500
501 /*
502 * Check if read-only switch is active.
503 */
504 if (!reinit) {
505 int ro = -1;
506
507 if (host->ops->get_ro)
508 ro = host->ops->get_ro(host);
509
510 if (ro < 0) {
511 printk(KERN_WARNING "%s: host does not "
512 "support reading read-only "
513 "switch. assuming write-enable.\n",
514 mmc_hostname(host));
515 } else if (ro > 0) {
516 mmc_card_set_readonly(card);
517 }
518 }
519
520 return 0;
521 }
522
523 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
524 {
525 unsigned max_dtr = (unsigned int)-1;
526
527 if (mmc_card_highspeed(card)) {
528 if (max_dtr > card->sw_caps.hs_max_dtr)
529 max_dtr = card->sw_caps.hs_max_dtr;
530 } else if (max_dtr > card->csd.max_dtr) {
531 max_dtr = card->csd.max_dtr;
532 }
533
534 return max_dtr;
535 }
536
537 void mmc_sd_go_highspeed(struct mmc_card *card)
538 {
539 mmc_card_set_highspeed(card);
540 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
541 }
542
543 /*
544 * Handle the detection and initialisation of a card.
545 *
546 * In the case of a resume, "oldcard" will contain the card
547 * we're trying to reinitialise.
548 */
549 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
550 struct mmc_card *oldcard)
551 {
552 struct mmc_card *card;
553 int err;
554 u32 cid[4];
555
556 BUG_ON(!host);
557 WARN_ON(!host->claimed);
558
559 err = mmc_sd_get_cid(host, ocr, cid);
560 if (err)
561 return err;
562
563 if (oldcard) {
564 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
565 return -ENOENT;
566
567 card = oldcard;
568 } else {
569 /*
570 * Allocate card structure.
571 */
572 card = mmc_alloc_card(host, &sd_type);
573 if (IS_ERR(card))
574 return PTR_ERR(card);
575
576 card->type = MMC_TYPE_SD;
577 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
578 }
579
580 /*
581 * For native busses: get card RCA and quit open drain mode.
582 */
583 if (!mmc_host_is_spi(host)) {
584 err = mmc_send_relative_addr(host, &card->rca);
585 if (err)
586 return err;
587
588 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
589 }
590
591 if (!oldcard) {
592 err = mmc_sd_get_csd(host, card);
593 if (err)
594 return err;
595
596 mmc_decode_cid(card);
597 }
598
599 /*
600 * Select card, as all following commands rely on that.
601 */
602 if (!mmc_host_is_spi(host)) {
603 err = mmc_select_card(card);
604 if (err)
605 return err;
606 }
607
608 err = mmc_sd_setup_card(host, card, oldcard != NULL);
609 if (err)
610 goto free_card;
611
612 /*
613 * Attempt to change to high-speed (if supported)
614 */
615 err = mmc_sd_switch_hs(card);
616 if (err > 0)
617 mmc_sd_go_highspeed(card);
618 else if (err)
619 goto free_card;
620
621 /*
622 * Set bus speed.
623 */
624 mmc_set_clock(host, mmc_sd_get_max_clock(card));
625
626 /*
627 * Switch to wider bus (if supported).
628 */
629 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
630 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
631 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
632 if (err)
633 goto free_card;
634
635 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
636 }
637
638 host->card = card;
639 return 0;
640
641 free_card:
642 if (!oldcard)
643 mmc_remove_card(card);
644
645 return err;
646 }
647
648 /*
649 * Host is being removed. Free up the current card.
650 */
651 static void mmc_sd_remove(struct mmc_host *host)
652 {
653 BUG_ON(!host);
654 BUG_ON(!host->card);
655
656 mmc_remove_card(host->card);
657 host->card = NULL;
658 }
659
660 /*
661 * Card detection callback from host.
662 */
663 static void mmc_sd_detect(struct mmc_host *host)
664 {
665 int err;
666
667 BUG_ON(!host);
668 BUG_ON(!host->card);
669
670 mmc_claim_host(host);
671
672 /*
673 * Just check if our card has been removed.
674 */
675 err = mmc_send_status(host->card, NULL);
676
677 mmc_release_host(host);
678
679 if (err) {
680 mmc_sd_remove(host);
681
682 mmc_claim_host(host);
683 mmc_detach_bus(host);
684 mmc_release_host(host);
685 }
686 }
687
688 /*
689 * Suspend callback from host.
690 */
691 static int mmc_sd_suspend(struct mmc_host *host)
692 {
693 BUG_ON(!host);
694 BUG_ON(!host->card);
695
696 mmc_claim_host(host);
697 if (!mmc_host_is_spi(host))
698 mmc_deselect_cards(host);
699 host->card->state &= ~MMC_STATE_HIGHSPEED;
700 mmc_release_host(host);
701
702 return 0;
703 }
704
705 /*
706 * Resume callback from host.
707 *
708 * This function tries to determine if the same card is still present
709 * and, if so, restore all state to it.
710 */
711 static int mmc_sd_resume(struct mmc_host *host)
712 {
713 int err;
714
715 BUG_ON(!host);
716 BUG_ON(!host->card);
717
718 mmc_claim_host(host);
719 err = mmc_sd_init_card(host, host->ocr, host->card);
720 mmc_release_host(host);
721
722 return err;
723 }
724
725 static int mmc_sd_power_restore(struct mmc_host *host)
726 {
727 int ret;
728
729 host->card->state &= ~MMC_STATE_HIGHSPEED;
730 mmc_claim_host(host);
731 ret = mmc_sd_init_card(host, host->ocr, host->card);
732 mmc_release_host(host);
733
734 return ret;
735 }
736
737 static const struct mmc_bus_ops mmc_sd_ops = {
738 .remove = mmc_sd_remove,
739 .detect = mmc_sd_detect,
740 .suspend = NULL,
741 .resume = NULL,
742 .power_restore = mmc_sd_power_restore,
743 };
744
745 static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
746 .remove = mmc_sd_remove,
747 .detect = mmc_sd_detect,
748 .suspend = mmc_sd_suspend,
749 .resume = mmc_sd_resume,
750 .power_restore = mmc_sd_power_restore,
751 };
752
753 static void mmc_sd_attach_bus_ops(struct mmc_host *host)
754 {
755 const struct mmc_bus_ops *bus_ops;
756
757 if (!mmc_card_is_removable(host))
758 bus_ops = &mmc_sd_ops_unsafe;
759 else
760 bus_ops = &mmc_sd_ops;
761 mmc_attach_bus(host, bus_ops);
762 }
763
764 /*
765 * Starting point for SD card init.
766 */
767 int mmc_attach_sd(struct mmc_host *host)
768 {
769 int err;
770 u32 ocr;
771
772 BUG_ON(!host);
773 WARN_ON(!host->claimed);
774
775 err = mmc_send_app_op_cond(host, 0, &ocr);
776 if (err)
777 return err;
778
779 mmc_sd_attach_bus_ops(host);
780 if (host->ocr_avail_sd)
781 host->ocr_avail = host->ocr_avail_sd;
782
783 /*
784 * We need to get OCR a different way for SPI.
785 */
786 if (mmc_host_is_spi(host)) {
787 mmc_go_idle(host);
788
789 err = mmc_spi_read_ocr(host, 0, &ocr);
790 if (err)
791 goto err;
792 }
793
794 /*
795 * Sanity check the voltages that the card claims to
796 * support.
797 */
798 if (ocr & 0x7F) {
799 printk(KERN_WARNING "%s: card claims to support voltages "
800 "below the defined range. These will be ignored.\n",
801 mmc_hostname(host));
802 ocr &= ~0x7F;
803 }
804
805 if ((ocr & MMC_VDD_165_195) &&
806 !(host->ocr_avail_sd & MMC_VDD_165_195)) {
807 printk(KERN_WARNING "%s: SD card claims to support the "
808 "incompletely defined 'low voltage range'. This "
809 "will be ignored.\n", mmc_hostname(host));
810 ocr &= ~MMC_VDD_165_195;
811 }
812
813 host->ocr = mmc_select_voltage(host, ocr);
814
815 /*
816 * Can we support the voltage(s) of the card(s)?
817 */
818 if (!host->ocr) {
819 err = -EINVAL;
820 goto err;
821 }
822
823 /*
824 * Detect and init the card.
825 */
826 err = mmc_sd_init_card(host, host->ocr, NULL);
827 if (err)
828 goto err;
829
830 mmc_release_host(host);
831 err = mmc_add_card(host->card);
832 mmc_claim_host(host);
833 if (err)
834 goto remove_card;
835
836 return 0;
837
838 remove_card:
839 mmc_release_host(host);
840 mmc_remove_card(host->card);
841 host->card = NULL;
842 mmc_claim_host(host);
843 err:
844 mmc_detach_bus(host);
845
846 printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
847 mmc_hostname(host), err);
848
849 return err;
850 }
851
Ubuntu Artful kernel mirror