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.h"
25 #include "sd_ops.h"
26
27 static const unsigned int tran_exp[] = {
28 10000, 100000, 1000000, 10000000,
29 0, 0, 0, 0
30 };
31
32 static const unsigned char tran_mant[] = {
33 0, 10, 12, 13, 15, 20, 25, 30,
34 35, 40, 45, 50, 55, 60, 70, 80,
35 };
36
37 static const unsigned int tacc_exp[] = {
38 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
39 };
40
41 static const unsigned int tacc_mant[] = {
42 0, 10, 12, 13, 15, 20, 25, 30,
43 35, 40, 45, 50, 55, 60, 70, 80,
44 };
45
46 #define UNSTUFF_BITS(resp,start,size) \
47 ({ \
48 const int __size = size; \
49 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
50 const int __off = 3 - ((start) / 32); \
51 const int __shft = (start) & 31; \
52 u32 __res; \
53 \
54 __res = resp[__off] >> __shft; \
55 if (__size + __shft > 32) \
56 __res |= resp[__off-1] << ((32 - __shft) % 32); \
57 __res & __mask; \
58 })
59
60 /*
61 * Given the decoded CSD structure, decode the raw CID to our CID structure.
62 */
mmc_decode_cid(struct mmc_card * card)63 void mmc_decode_cid(struct mmc_card *card)
64 {
65 u32 *resp = card->raw_cid;
66
67 memset(&card->cid, 0, sizeof(struct mmc_cid));
68
69 /*
70 * SD doesn't currently have a version field so we will
71 * have to assume we can parse this.
72 */
73 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
74 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
75 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
76 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
77 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
78 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
79 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
80 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
81 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
82 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
83 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
84 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
85
86 card->cid.year += 2000; /* SD cards year offset */
87 }
88
89 /*
90 * Given a 128-bit response, decode to our card CSD structure.
91 */
mmc_decode_csd(struct mmc_card * card)92 static int mmc_decode_csd(struct mmc_card *card)
93 {
94 struct mmc_csd *csd = &card->csd;
95 unsigned int e, m, csd_struct;
96 u32 *resp = card->raw_csd;
97
98 csd_struct = UNSTUFF_BITS(resp, 126, 2);
99
100 switch (csd_struct) {
101 case 0:
102 m = UNSTUFF_BITS(resp, 115, 4);
103 e = UNSTUFF_BITS(resp, 112, 3);
104 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
105 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
106
107 m = UNSTUFF_BITS(resp, 99, 4);
108 e = UNSTUFF_BITS(resp, 96, 3);
109 csd->max_dtr = tran_exp[e] * tran_mant[m];
110 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
111
112 e = UNSTUFF_BITS(resp, 47, 3);
113 m = UNSTUFF_BITS(resp, 62, 12);
114 csd->capacity = (1 + m) << (e + 2);
115
116 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
117 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
118 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
119 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
120 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
121 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
122 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
123
124 if (UNSTUFF_BITS(resp, 46, 1)) {
125 csd->erase_size = 1;
126 } else if (csd->write_blkbits >= 9) {
127 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
128 csd->erase_size <<= csd->write_blkbits - 9;
129 }
130 break;
131 case 1:
132 /*
133 * This is a block-addressed SDHC card. Most
134 * interesting fields are unused and have fixed
135 * values. To avoid getting tripped by buggy cards,
136 * we assume those fixed values ourselves.
137 */
138 mmc_card_set_blockaddr(card);
139
140 csd->tacc_ns = 0; /* Unused */
141 csd->tacc_clks = 0; /* Unused */
142
143 m = UNSTUFF_BITS(resp, 99, 4);
144 e = UNSTUFF_BITS(resp, 96, 3);
145 csd->max_dtr = tran_exp[e] * tran_mant[m];
146 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
147
148 m = UNSTUFF_BITS(resp, 48, 22);
149 csd->capacity = (1 + m) << 10;
150
151 csd->read_blkbits = 9;
152 csd->read_partial = 0;
153 csd->write_misalign = 0;
154 csd->read_misalign = 0;
155 csd->r2w_factor = 4; /* Unused */
156 csd->write_blkbits = 9;
157 csd->write_partial = 0;
158 csd->erase_size = 1;
159 break;
160 default:
161 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
162 mmc_hostname(card->host), csd_struct);
163 return -EINVAL;
164 }
165
166 card->erase_size = csd->erase_size;
167
168 return 0;
169 }
170
171 /*
172 * Given a 64-bit response, decode to our card SCR structure.
173 */
mmc_decode_scr(struct mmc_card * card)174 static int mmc_decode_scr(struct mmc_card *card)
175 {
176 struct sd_scr *scr = &card->scr;
177 unsigned int scr_struct;
178 u32 resp[4];
179
180 resp[3] = card->raw_scr[1];
181 resp[2] = card->raw_scr[0];
182
183 scr_struct = UNSTUFF_BITS(resp, 60, 4);
184 if (scr_struct != 0) {
185 printk(KERN_ERR "%s: unrecognised SCR structure version %d\n",
186 mmc_hostname(card->host), scr_struct);
187 return -EINVAL;
188 }
189
190 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
191 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
192
193 if (UNSTUFF_BITS(resp, 55, 1))
194 card->erased_byte = 0xFF;
195 else
196 card->erased_byte = 0x0;
197
198 return 0;
199 }
200
201 /*
202 * Fetch and process SD Status register.
203 */
mmc_read_ssr(struct mmc_card * card)204 static int mmc_read_ssr(struct mmc_card *card)
205 {
206 unsigned int au, es, et, eo;
207 int err, i;
208 u32 *ssr;
209
210 if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
211 printk(KERN_WARNING "%s: card lacks mandatory SD Status "
212 "function.\n", mmc_hostname(card->host));
213 return 0;
214 }
215
216 ssr = kmalloc(64, GFP_KERNEL);
217 if (!ssr)
218 return -ENOMEM;
219
220 err = mmc_app_sd_status(card, ssr);
221 if (err) {
222 printk(KERN_WARNING "%s: problem reading SD Status "
223 "register.\n", mmc_hostname(card->host));
224 err = 0;
225 goto out;
226 }
227
228 for (i = 0; i < 16; i++)
229 ssr[i] = be32_to_cpu(ssr[i]);
230
231 /*
232 * UNSTUFF_BITS only works with four u32s so we have to offset the
233 * bitfield positions accordingly.
234 */
235 au = UNSTUFF_BITS(ssr, 428 - 384, 4);
236 if (au > 0 || au <= 9) {
237 card->ssr.au = 1 << (au + 4);
238 es = UNSTUFF_BITS(ssr, 408 - 384, 16);
239 et = UNSTUFF_BITS(ssr, 402 - 384, 6);
240 eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
241 if (es && et) {
242 card->ssr.erase_timeout = (et * 1000) / es;
243 card->ssr.erase_offset = eo * 1000;
244 }
245 } else {
246 printk(KERN_WARNING "%s: SD Status: Invalid Allocation Unit "
247 "size.\n", mmc_hostname(card->host));
248 }
249 out:
250 kfree(ssr);
251 return err;
252 }
253
254 /*
255 * Fetches and decodes switch information
256 */
mmc_read_switch(struct mmc_card * card)257 static int mmc_read_switch(struct mmc_card *card)
258 {
259 int err;
260 u8 *status;
261
262 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
263 return 0;
264
265 if (!(card->csd.cmdclass & CCC_SWITCH)) {
266 printk(KERN_WARNING "%s: card lacks mandatory switch "
267 "function, performance might suffer.\n",
268 mmc_hostname(card->host));
269 return 0;
270 }
271
272 err = -EIO;
273
274 status = kmalloc(64, GFP_KERNEL);
275 if (!status) {
276 printk(KERN_ERR "%s: could not allocate a buffer for "
277 "switch capabilities.\n", mmc_hostname(card->host));
278 return -ENOMEM;
279 }
280
281 err = mmc_sd_switch(card, 0, 0, 1, status);
282 if (err) {
283 /* If the host or the card can't do the switch,
284 * fail more gracefully. */
285 if ((err != -EINVAL)
286 && (err != -ENOSYS)
287 && (err != -EFAULT))
288 goto out;
289
290 printk(KERN_WARNING "%s: problem reading switch "
291 "capabilities, performance might suffer.\n",
292 mmc_hostname(card->host));
293 err = 0;
294
295 goto out;
296 }
297
298 if (status[13] & 0x02)
299 card->sw_caps.hs_max_dtr = 50000000;
300
301 out:
302 kfree(status);
303
304 return err;
305 }
306
307 /*
308 * Test if the card supports high-speed mode and, if so, switch to it.
309 */
mmc_sd_switch_hs(struct mmc_card * card)310 int mmc_sd_switch_hs(struct mmc_card *card)
311 {
312 int err;
313 u8 *status;
314
315 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
316 return 0;
317
318 if (!(card->csd.cmdclass & CCC_SWITCH))
319 return 0;
320
321 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
322 return 0;
323
324 if (card->sw_caps.hs_max_dtr == 0)
325 return 0;
326
327 err = -EIO;
328
329 status = kmalloc(64, GFP_KERNEL);
330 if (!status) {
331 printk(KERN_ERR "%s: could not allocate a buffer for "
332 "switch capabilities.\n", mmc_hostname(card->host));
333 return -ENOMEM;
334 }
335
336 err = mmc_sd_switch(card, 1, 0, 1, status);
337 if (err)
338 goto out;
339
340 if ((status[16] & 0xF) != 1) {
341 printk(KERN_WARNING "%s: Problem switching card "
342 "into high-speed mode!\n",
343 mmc_hostname(card->host));
344 err = 0;
345 } else {
346 err = 1;
347 }
348
349 out:
350 kfree(status);
351
352 return err;
353 }
354
355 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
356 card->raw_cid[2], card->raw_cid[3]);
357 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
358 card->raw_csd[2], card->raw_csd[3]);
359 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
360 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
361 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
362 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
363 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
364 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
365 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
366 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
367 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
368 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
369
370
371 static struct attribute *sd_std_attrs[] = {
372 &dev_attr_cid.attr,
373 &dev_attr_csd.attr,
374 &dev_attr_scr.attr,
375 &dev_attr_date.attr,
376 &dev_attr_erase_size.attr,
377 &dev_attr_preferred_erase_size.attr,
378 &dev_attr_fwrev.attr,
379 &dev_attr_hwrev.attr,
380 &dev_attr_manfid.attr,
381 &dev_attr_name.attr,
382 &dev_attr_oemid.attr,
383 &dev_attr_serial.attr,
384 NULL,
385 };
386
387 static struct attribute_group sd_std_attr_group = {
388 .attrs = sd_std_attrs,
389 };
390
391 static const struct attribute_group *sd_attr_groups[] = {
392 &sd_std_attr_group,
393 NULL,
394 };
395
396 struct device_type sd_type = {
397 .groups = sd_attr_groups,
398 };
399
400 /*
401 * Fetch CID from card.
402 */
mmc_sd_get_cid(struct mmc_host * host,u32 ocr,u32 * cid)403 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid)
404 {
405 int err;
406
407 /*
408 * Since we're changing the OCR value, we seem to
409 * need to tell some cards to go back to the idle
410 * state. We wait 1ms to give cards time to
411 * respond.
412 */
413 mmc_go_idle(host);
414
415 /*
416 * If SD_SEND_IF_COND indicates an SD 2.0
417 * compliant card and we should set bit 30
418 * of the ocr to indicate that we can handle
419 * block-addressed SDHC cards.
420 */
421 err = mmc_send_if_cond(host, ocr);
422 if (!err)
423 ocr |= 1 << 30;
424
425 err = mmc_send_app_op_cond(host, ocr, NULL);
426 if (err)
427 return err;
428
429 if (mmc_host_is_spi(host))
430 err = mmc_send_cid(host, cid);
431 else
432 err = mmc_all_send_cid(host, cid);
433
434 return err;
435 }
436
mmc_sd_get_csd(struct mmc_host * host,struct mmc_card * card)437 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
438 {
439 int err;
440
441 /*
442 * Fetch CSD from card.
443 */
444 err = mmc_send_csd(card, card->raw_csd);
445 if (err)
446 return err;
447
448 err = mmc_decode_csd(card);
449 if (err)
450 return err;
451
452 return 0;
453 }
454
mmc_sd_setup_card(struct mmc_host * host,struct mmc_card * card,bool reinit)455 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
456 bool reinit)
457 {
458 int err;
459
460 if (!reinit) {
461 /*
462 * Fetch SCR from card.
463 */
464 err = mmc_app_send_scr(card, card->raw_scr);
465 if (err)
466 return err;
467
468 err = mmc_decode_scr(card);
469 if (err)
470 return err;
471
472 /*
473 * Fetch and process SD Status register.
474 */
475 err = mmc_read_ssr(card);
476 if (err)
477 return err;
478
479 /* Erase init depends on CSD and SSR */
480 mmc_init_erase(card);
481
482 /*
483 * Fetch switch information from card.
484 */
485 err = mmc_read_switch(card);
486 if (err)
487 return err;
488 }
489
490 /*
491 * For SPI, enable CRC as appropriate.
492 * This CRC enable is located AFTER the reading of the
493 * card registers because some SDHC cards are not able
494 * to provide valid CRCs for non-512-byte blocks.
495 */
496 if (mmc_host_is_spi(host)) {
497 err = mmc_spi_set_crc(host, use_spi_crc);
498 if (err)
499 return err;
500 }
501
502 /*
503 * Check if read-only switch is active.
504 */
505 if (!reinit) {
506 int ro = -1;
507
508 if (host->ops->get_ro)
509 ro = host->ops->get_ro(host);
510
511 if (ro < 0) {
512 printk(KERN_WARNING "%s: host does not "
513 "support reading read-only "
514 "switch. assuming write-enable.\n",
515 mmc_hostname(host));
516 } else if (ro > 0) {
517 mmc_card_set_readonly(card);
518 }
519 }
520
521 return 0;
522 }
523
mmc_sd_get_max_clock(struct mmc_card * card)524 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
525 {
526 unsigned max_dtr = (unsigned int)-1;
527
528 if (mmc_card_highspeed(card)) {
529 if (max_dtr > card->sw_caps.hs_max_dtr)
530 max_dtr = card->sw_caps.hs_max_dtr;
531 } else if (max_dtr > card->csd.max_dtr) {
532 max_dtr = card->csd.max_dtr;
533 }
534
535 return max_dtr;
536 }
537
mmc_sd_go_highspeed(struct mmc_card * card)538 void mmc_sd_go_highspeed(struct mmc_card *card)
539 {
540 mmc_card_set_highspeed(card);
541 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
542 }
543
544 /*
545 * Handle the detection and initialisation of a card.
546 *
547 * In the case of a resume, "oldcard" will contain the card
548 * we're trying to reinitialise.
549 */
mmc_sd_init_card(struct mmc_host * host,u32 ocr,struct mmc_card * oldcard)550 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
551 struct mmc_card *oldcard)
552 {
553 struct mmc_card *card;
554 int err;
555 u32 cid[4];
556
557 BUG_ON(!host);
558 WARN_ON(!host->claimed);
559
560 err = mmc_sd_get_cid(host, ocr, cid);
561 if (err)
562 return err;
563
564 if (oldcard) {
565 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
566 return -ENOENT;
567
568 card = oldcard;
569 } else {
570 /*
571 * Allocate card structure.
572 */
573 card = mmc_alloc_card(host, &sd_type);
574 if (IS_ERR(card))
575 return PTR_ERR(card);
576
577 card->type = MMC_TYPE_SD;
578 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
579 }
580
581 /*
582 * For native busses: get card RCA and quit open drain mode.
583 */
584 if (!mmc_host_is_spi(host)) {
585 err = mmc_send_relative_addr(host, &card->rca);
586 if (err)
587 return err;
588
589 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
590 }
591
592 if (!oldcard) {
593 err = mmc_sd_get_csd(host, card);
594 if (err)
595 return err;
596
597 mmc_decode_cid(card);
598 }
599
600 /*
601 * Select card, as all following commands rely on that.
602 */
603 if (!mmc_host_is_spi(host)) {
604 err = mmc_select_card(card);
605 if (err)
606 return err;
607 }
608
609 err = mmc_sd_setup_card(host, card, oldcard != NULL);
610 if (err)
611 goto free_card;
612
613 /*
614 * Attempt to change to high-speed (if supported)
615 */
616 err = mmc_sd_switch_hs(card);
617 if (err > 0)
618 mmc_sd_go_highspeed(card);
619 else if (err)
620 goto free_card;
621
622 /*
623 * Set bus speed.
624 */
625 mmc_set_clock(host, mmc_sd_get_max_clock(card));
626
627 /*
628 * Switch to wider bus (if supported).
629 */
630 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
631 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
632 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
633 if (err)
634 goto free_card;
635
636 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
637 }
638
639 host->card = card;
640 return 0;
641
642 free_card:
643 if (!oldcard)
644 mmc_remove_card(card);
645
646 return err;
647 }
648
649 /*
650 * Host is being removed. Free up the current card.
651 */
mmc_sd_remove(struct mmc_host * host)652 static void mmc_sd_remove(struct mmc_host *host)
653 {
654 BUG_ON(!host);
655 BUG_ON(!host->card);
656
657 mmc_remove_card(host->card);
658 host->card = NULL;
659 }
660
661 /*
662 * Card detection callback from host.
663 */
mmc_sd_detect(struct mmc_host * host)664 static void mmc_sd_detect(struct mmc_host *host)
665 {
666 int err;
667
668 BUG_ON(!host);
669 BUG_ON(!host->card);
670
671 mmc_claim_host(host);
672
673 /*
674 * Just check if our card has been removed.
675 */
676 err = mmc_send_status(host->card, NULL);
677
678 mmc_release_host(host);
679
680 if (err) {
681 mmc_sd_remove(host);
682
683 mmc_claim_host(host);
684 mmc_detach_bus(host);
685 mmc_release_host(host);
686 }
687 }
688
689 /*
690 * Suspend callback from host.
691 */
mmc_sd_suspend(struct mmc_host * host)692 static int mmc_sd_suspend(struct mmc_host *host)
693 {
694 BUG_ON(!host);
695 BUG_ON(!host->card);
696
697 mmc_claim_host(host);
698 if (!mmc_host_is_spi(host))
699 mmc_deselect_cards(host);
700 host->card->state &= ~MMC_STATE_HIGHSPEED;
701 mmc_release_host(host);
702
703 return 0;
704 }
705
706 /*
707 * Resume callback from host.
708 *
709 * This function tries to determine if the same card is still present
710 * and, if so, restore all state to it.
711 */
mmc_sd_resume(struct mmc_host * host)712 static int mmc_sd_resume(struct mmc_host *host)
713 {
714 int err;
715
716 BUG_ON(!host);
717 BUG_ON(!host->card);
718
719 mmc_claim_host(host);
720 err = mmc_sd_init_card(host, host->ocr, host->card);
721 mmc_release_host(host);
722
723 return err;
724 }
725
mmc_sd_power_restore(struct mmc_host * host)726 static int mmc_sd_power_restore(struct mmc_host *host)
727 {
728 int ret;
729
730 host->card->state &= ~MMC_STATE_HIGHSPEED;
731 mmc_claim_host(host);
732 ret = mmc_sd_init_card(host, host->ocr, host->card);
733 mmc_release_host(host);
734
735 return ret;
736 }
737
738 static const struct mmc_bus_ops mmc_sd_ops = {
739 .remove = mmc_sd_remove,
740 .detect = mmc_sd_detect,
741 .suspend = NULL,
742 .resume = NULL,
743 .power_restore = mmc_sd_power_restore,
744 };
745
746 static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
747 .remove = mmc_sd_remove,
748 .detect = mmc_sd_detect,
749 .suspend = mmc_sd_suspend,
750 .resume = mmc_sd_resume,
751 .power_restore = mmc_sd_power_restore,
752 };
753
mmc_sd_attach_bus_ops(struct mmc_host * host)754 static void mmc_sd_attach_bus_ops(struct mmc_host *host)
755 {
756 const struct mmc_bus_ops *bus_ops;
757
758 if (!mmc_card_is_removable(host))
759 bus_ops = &mmc_sd_ops_unsafe;
760 else
761 bus_ops = &mmc_sd_ops;
762 mmc_attach_bus(host, bus_ops);
763 }
764
765 /*
766 * Starting point for SD card init.
767 */
mmc_attach_sd(struct mmc_host * host)768 int mmc_attach_sd(struct mmc_host *host)
769 {
770 int err;
771 u32 ocr;
772
773 BUG_ON(!host);
774 WARN_ON(!host->claimed);
775
776 err = mmc_send_app_op_cond(host, 0, &ocr);
777 if (err)
778 return err;
779
780 mmc_sd_attach_bus_ops(host);
781 if (host->ocr_avail_sd)
782 host->ocr_avail = host->ocr_avail_sd;
783
784 /*
785 * We need to get OCR a different way for SPI.
786 */
787 if (mmc_host_is_spi(host)) {
788 mmc_go_idle(host);
789
790 err = mmc_spi_read_ocr(host, 0, &ocr);
791 if (err)
792 goto err;
793 }
794
795 /*
796 * Sanity check the voltages that the card claims to
797 * support.
798 */
799 if (ocr & 0x7F) {
800 printk(KERN_WARNING "%s: card claims to support voltages "
801 "below the defined range. These will be ignored.\n",
802 mmc_hostname(host));
803 ocr &= ~0x7F;
804 }
805
806 if ((ocr & MMC_VDD_165_195) &&
807 !(host->ocr_avail_sd & MMC_VDD_165_195)) {
808 printk(KERN_WARNING "%s: SD card claims to support the "
809 "incompletely defined 'low voltage range'. This "
810 "will be ignored.\n", mmc_hostname(host));
811 ocr &= ~MMC_VDD_165_195;
812 }
813
814 host->ocr = mmc_select_voltage(host, ocr);
815
816 /*
817 * Can we support the voltage(s) of the card(s)?
818 */
819 if (!host->ocr) {
820 err = -EINVAL;
821 goto err;
822 }
823
824 /*
825 * Detect and init the card.
826 */
827 err = mmc_sd_init_card(host, host->ocr, NULL);
828 if (err)
829 goto err;
830
831 mmc_release_host(host);
832 err = mmc_add_card(host->card);
833 mmc_claim_host(host);
834 if (err)
835 goto remove_card;
836
837 return 0;
838
839 remove_card:
840 mmc_release_host(host);
841 mmc_remove_card(host->card);
842 host->card = NULL;
843 mmc_claim_host(host);
844 err:
845 mmc_detach_bus(host);
846
847 printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
848 mmc_hostname(host), err);
849
850 return err;
851 }
852
853