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enic: Add new firmware devcmds
[linux/fpc-iii.git] / drivers / mmc / core / mmc.c
blob6909a54c39beac1a8ca277f317f43c4a4ea9d583
1 /*
2 * linux/drivers/mmc/core/mmc.c
3 *
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
6 * MMCv4 support Copyright (C) 2006 Philip Langdale, 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
20 #include "core.h"
21 #include "bus.h"
22 #include "mmc_ops.h"
23
24 static const unsigned int tran_exp[] = {
25 10000, 100000, 1000000, 10000000,
26 0, 0, 0, 0
27 };
28
29 static const unsigned char tran_mant[] = {
30 0, 10, 12, 13, 15, 20, 25, 30,
31 35, 40, 45, 50, 55, 60, 70, 80,
32 };
33
34 static const unsigned int tacc_exp[] = {
35 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
36 };
37
38 static const unsigned int tacc_mant[] = {
39 0, 10, 12, 13, 15, 20, 25, 30,
40 35, 40, 45, 50, 55, 60, 70, 80,
41 };
42
43 #define UNSTUFF_BITS(resp,start,size) \
44 ({ \
45 const int __size = size; \
46 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
47 const int __off = 3 - ((start) / 32); \
48 const int __shft = (start) & 31; \
49 u32 __res; \
50 \
51 __res = resp[__off] >> __shft; \
52 if (__size + __shft > 32) \
53 __res |= resp[__off-1] << ((32 - __shft) % 32); \
54 __res & __mask; \
55 })
56
57 /*
58 * Given the decoded CSD structure, decode the raw CID to our CID structure.
59 */
60 static int mmc_decode_cid(struct mmc_card *card)
61 {
62 u32 *resp = card->raw_cid;
63
64 /*
65 * The selection of the format here is based upon published
66 * specs from sandisk and from what people have reported.
67 */
68 switch (card->csd.mmca_vsn) {
69 case 0: /* MMC v1.0 - v1.2 */
70 case 1: /* MMC v1.4 */
71 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
72 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
73 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
74 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
75 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
76 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
77 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
78 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
79 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
80 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
81 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
82 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
83 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
84 break;
85
86 case 2: /* MMC v2.0 - v2.2 */
87 case 3: /* MMC v3.1 - v3.3 */
88 case 4: /* MMC v4 */
89 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
90 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
91 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
92 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
93 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
94 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
95 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
96 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
97 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
98 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
99 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
100 break;
101
102 default:
103 printk(KERN_ERR "%s: card has unknown MMCA version %d\n",
104 mmc_hostname(card->host), card->csd.mmca_vsn);
105 return -EINVAL;
106 }
107
108 return 0;
109 }
110
111 static void mmc_set_erase_size(struct mmc_card *card)
112 {
113 if (card->ext_csd.erase_group_def & 1)
114 card->erase_size = card->ext_csd.hc_erase_size;
115 else
116 card->erase_size = card->csd.erase_size;
117
118 mmc_init_erase(card);
119 }
120
121 /*
122 * Given a 128-bit response, decode to our card CSD structure.
123 */
124 static int mmc_decode_csd(struct mmc_card *card)
125 {
126 struct mmc_csd *csd = &card->csd;
127 unsigned int e, m, a, b;
128 u32 *resp = card->raw_csd;
129
130 /*
131 * We only understand CSD structure v1.1 and v1.2.
132 * v1.2 has extra information in bits 15, 11 and 10.
133 * We also support eMMC v4.4 & v4.41.
134 */
135 csd->structure = UNSTUFF_BITS(resp, 126, 2);
136 if (csd->structure == 0) {
137 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
138 mmc_hostname(card->host), csd->structure);
139 return -EINVAL;
140 }
141
142 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
143 m = UNSTUFF_BITS(resp, 115, 4);
144 e = UNSTUFF_BITS(resp, 112, 3);
145 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
146 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
147
148 m = UNSTUFF_BITS(resp, 99, 4);
149 e = UNSTUFF_BITS(resp, 96, 3);
150 csd->max_dtr = tran_exp[e] * tran_mant[m];
151 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
152
153 e = UNSTUFF_BITS(resp, 47, 3);
154 m = UNSTUFF_BITS(resp, 62, 12);
155 csd->capacity = (1 + m) << (e + 2);
156
157 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
158 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
159 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
160 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
161 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
162 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
163 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
164
165 if (csd->write_blkbits >= 9) {
166 a = UNSTUFF_BITS(resp, 42, 5);
167 b = UNSTUFF_BITS(resp, 37, 5);
168 csd->erase_size = (a + 1) * (b + 1);
169 csd->erase_size <<= csd->write_blkbits - 9;
170 }
171
172 return 0;
173 }
174
175 /*
176 * Read and decode extended CSD.
177 */
178 static int mmc_read_ext_csd(struct mmc_card *card)
179 {
180 int err;
181 u8 *ext_csd;
182
183 BUG_ON(!card);
184
185 if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
186 return 0;
187
188 /*
189 * As the ext_csd is so large and mostly unused, we don't store the
190 * raw block in mmc_card.
191 */
192 ext_csd = kmalloc(512, GFP_KERNEL);
193 if (!ext_csd) {
194 printk(KERN_ERR "%s: could not allocate a buffer to "
195 "receive the ext_csd.\n", mmc_hostname(card->host));
196 return -ENOMEM;
197 }
198
199 err = mmc_send_ext_csd(card, ext_csd);
200 if (err) {
201 /* If the host or the card can't do the switch,
202 * fail more gracefully. */
203 if ((err != -EINVAL)
204 && (err != -ENOSYS)
205 && (err != -EFAULT))
206 goto out;
207
208 /*
209 * High capacity cards should have this "magic" size
210 * stored in their CSD.
211 */
212 if (card->csd.capacity == (4096 * 512)) {
213 printk(KERN_ERR "%s: unable to read EXT_CSD "
214 "on a possible high capacity card. "
215 "Card will be ignored.\n",
216 mmc_hostname(card->host));
217 } else {
218 printk(KERN_WARNING "%s: unable to read "
219 "EXT_CSD, performance might "
220 "suffer.\n",
221 mmc_hostname(card->host));
222 err = 0;
223 }
224
225 goto out;
226 }
227
228 /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
229 if (card->csd.structure == 3) {
230 int ext_csd_struct = ext_csd[EXT_CSD_STRUCTURE];
231 if (ext_csd_struct > 2) {
232 printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
233 "version %d\n", mmc_hostname(card->host),
234 ext_csd_struct);
235 err = -EINVAL;
236 goto out;
237 }
238 }
239
240 card->ext_csd.rev = ext_csd[EXT_CSD_REV];
241 if (card->ext_csd.rev > 5) {
242 printk(KERN_ERR "%s: unrecognised EXT_CSD revision %d\n",
243 mmc_hostname(card->host), card->ext_csd.rev);
244 err = -EINVAL;
245 goto out;
246 }
247
248 if (card->ext_csd.rev >= 2) {
249 card->ext_csd.sectors =
250 ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
251 ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
252 ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
253 ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
254
255 /* Cards with density > 2GiB are sector addressed */
256 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
257 mmc_card_set_blockaddr(card);
258 }
259
260 switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
261 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
262 card->ext_csd.hs_max_dtr = 52000000;
263 break;
264 case EXT_CSD_CARD_TYPE_26:
265 card->ext_csd.hs_max_dtr = 26000000;
266 break;
267 default:
268 /* MMC v4 spec says this cannot happen */
269 printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
270 "support any high-speed modes.\n",
271 mmc_hostname(card->host));
272 }
273
274 if (card->ext_csd.rev >= 3) {
275 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
276
277 /* Sleep / awake timeout in 100ns units */
278 if (sa_shift > 0 && sa_shift <= 0x17)
279 card->ext_csd.sa_timeout =
280 1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
281 card->ext_csd.erase_group_def =
282 ext_csd[EXT_CSD_ERASE_GROUP_DEF];
283 card->ext_csd.hc_erase_timeout = 300 *
284 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
285 card->ext_csd.hc_erase_size =
286 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
287 }
288
289 if (card->ext_csd.rev >= 4) {
290 card->ext_csd.sec_trim_mult =
291 ext_csd[EXT_CSD_SEC_TRIM_MULT];
292 card->ext_csd.sec_erase_mult =
293 ext_csd[EXT_CSD_SEC_ERASE_MULT];
294 card->ext_csd.sec_feature_support =
295 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
296 card->ext_csd.trim_timeout = 300 *
297 ext_csd[EXT_CSD_TRIM_MULT];
298 }
299
300 if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
301 card->erased_byte = 0xFF;
302 else
303 card->erased_byte = 0x0;
304
305 out:
306 kfree(ext_csd);
307
308 return err;
309 }
310
311 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
312 card->raw_cid[2], card->raw_cid[3]);
313 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
314 card->raw_csd[2], card->raw_csd[3]);
315 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
316 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
317 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
318 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
319 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
320 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
321 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
322 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
323 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
324
325 static struct attribute *mmc_std_attrs[] = {
326 &dev_attr_cid.attr,
327 &dev_attr_csd.attr,
328 &dev_attr_date.attr,
329 &dev_attr_erase_size.attr,
330 &dev_attr_preferred_erase_size.attr,
331 &dev_attr_fwrev.attr,
332 &dev_attr_hwrev.attr,
333 &dev_attr_manfid.attr,
334 &dev_attr_name.attr,
335 &dev_attr_oemid.attr,
336 &dev_attr_serial.attr,
337 NULL,
338 };
339
340 static struct attribute_group mmc_std_attr_group = {
341 .attrs = mmc_std_attrs,
342 };
343
344 static const struct attribute_group *mmc_attr_groups[] = {
345 &mmc_std_attr_group,
346 NULL,
347 };
348
349 static struct device_type mmc_type = {
350 .groups = mmc_attr_groups,
351 };
352
353 /*
354 * Handle the detection and initialisation of a card.
355 *
356 * In the case of a resume, "oldcard" will contain the card
357 * we're trying to reinitialise.
358 */
359 static int mmc_init_card(struct mmc_host *host, u32 ocr,
360 struct mmc_card *oldcard)
361 {
362 struct mmc_card *card;
363 int err;
364 u32 cid[4];
365 unsigned int max_dtr;
366
367 BUG_ON(!host);
368 WARN_ON(!host->claimed);
369
370 /*
371 * Since we're changing the OCR value, we seem to
372 * need to tell some cards to go back to the idle
373 * state. We wait 1ms to give cards time to
374 * respond.
375 */
376 mmc_go_idle(host);
377
378 /* The extra bit indicates that we support high capacity */
379 err = mmc_send_op_cond(host, ocr | (1 << 30), NULL);
380 if (err)
381 goto err;
382
383 /*
384 * For SPI, enable CRC as appropriate.
385 */
386 if (mmc_host_is_spi(host)) {
387 err = mmc_spi_set_crc(host, use_spi_crc);
388 if (err)
389 goto err;
390 }
391
392 /*
393 * Fetch CID from card.
394 */
395 if (mmc_host_is_spi(host))
396 err = mmc_send_cid(host, cid);
397 else
398 err = mmc_all_send_cid(host, cid);
399 if (err)
400 goto err;
401
402 if (oldcard) {
403 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
404 err = -ENOENT;
405 goto err;
406 }
407
408 card = oldcard;
409 } else {
410 /*
411 * Allocate card structure.
412 */
413 card = mmc_alloc_card(host, &mmc_type);
414 if (IS_ERR(card)) {
415 err = PTR_ERR(card);
416 goto err;
417 }
418
419 card->type = MMC_TYPE_MMC;
420 card->rca = 1;
421 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
422 }
423
424 /*
425 * For native busses: set card RCA and quit open drain mode.
426 */
427 if (!mmc_host_is_spi(host)) {
428 err = mmc_set_relative_addr(card);
429 if (err)
430 goto free_card;
431
432 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
433 }
434
435 if (!oldcard) {
436 /*
437 * Fetch CSD from card.
438 */
439 err = mmc_send_csd(card, card->raw_csd);
440 if (err)
441 goto free_card;
442
443 err = mmc_decode_csd(card);
444 if (err)
445 goto free_card;
446 err = mmc_decode_cid(card);
447 if (err)
448 goto free_card;
449 }
450
451 /*
452 * Select card, as all following commands rely on that.
453 */
454 if (!mmc_host_is_spi(host)) {
455 err = mmc_select_card(card);
456 if (err)
457 goto free_card;
458 }
459
460 if (!oldcard) {
461 /*
462 * Fetch and process extended CSD.
463 */
464 err = mmc_read_ext_csd(card);
465 if (err)
466 goto free_card;
467 /* Erase size depends on CSD and Extended CSD */
468 mmc_set_erase_size(card);
469 }
470
471 /*
472 * Activate high speed (if supported)
473 */
474 if ((card->ext_csd.hs_max_dtr != 0) &&
475 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
476 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
477 EXT_CSD_HS_TIMING, 1);
478 if (err && err != -EBADMSG)
479 goto free_card;
480
481 if (err) {
482 printk(KERN_WARNING "%s: switch to highspeed failed\n",
483 mmc_hostname(card->host));
484 err = 0;
485 } else {
486 mmc_card_set_highspeed(card);
487 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
488 }
489 }
490
491 /*
492 * Compute bus speed.
493 */
494 max_dtr = (unsigned int)-1;
495
496 if (mmc_card_highspeed(card)) {
497 if (max_dtr > card->ext_csd.hs_max_dtr)
498 max_dtr = card->ext_csd.hs_max_dtr;
499 } else if (max_dtr > card->csd.max_dtr) {
500 max_dtr = card->csd.max_dtr;
501 }
502
503 mmc_set_clock(host, max_dtr);
504
505 /*
506 * Activate wide bus (if supported).
507 */
508 if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
509 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
510 unsigned ext_csd_bit, bus_width;
511
512 if (host->caps & MMC_CAP_8_BIT_DATA) {
513 ext_csd_bit = EXT_CSD_BUS_WIDTH_8;
514 bus_width = MMC_BUS_WIDTH_8;
515 } else {
516 ext_csd_bit = EXT_CSD_BUS_WIDTH_4;
517 bus_width = MMC_BUS_WIDTH_4;
518 }
519
520 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
521 EXT_CSD_BUS_WIDTH, ext_csd_bit);
522
523 if (err && err != -EBADMSG)
524 goto free_card;
525
526 if (err) {
527 printk(KERN_WARNING "%s: switch to bus width %d "
528 "failed\n", mmc_hostname(card->host),
529 1 << bus_width);
530 err = 0;
531 } else {
532 mmc_set_bus_width(card->host, bus_width);
533 }
534 }
535
536 if (!oldcard)
537 host->card = card;
538
539 return 0;
540
541 free_card:
542 if (!oldcard)
543 mmc_remove_card(card);
544 err:
545
546 return err;
547 }
548
549 /*
550 * Host is being removed. Free up the current card.
551 */
552 static void mmc_remove(struct mmc_host *host)
553 {
554 BUG_ON(!host);
555 BUG_ON(!host->card);
556
557 mmc_remove_card(host->card);
558 host->card = NULL;
559 }
560
561 /*
562 * Card detection callback from host.
563 */
564 static void mmc_detect(struct mmc_host *host)
565 {
566 int err;
567
568 BUG_ON(!host);
569 BUG_ON(!host->card);
570
571 mmc_claim_host(host);
572
573 /*
574 * Just check if our card has been removed.
575 */
576 err = mmc_send_status(host->card, NULL);
577
578 mmc_release_host(host);
579
580 if (err) {
581 mmc_remove(host);
582
583 mmc_claim_host(host);
584 mmc_detach_bus(host);
585 mmc_release_host(host);
586 }
587 }
588
589 /*
590 * Suspend callback from host.
591 */
592 static int mmc_suspend(struct mmc_host *host)
593 {
594 BUG_ON(!host);
595 BUG_ON(!host->card);
596
597 mmc_claim_host(host);
598 if (!mmc_host_is_spi(host))
599 mmc_deselect_cards(host);
600 host->card->state &= ~MMC_STATE_HIGHSPEED;
601 mmc_release_host(host);
602
603 return 0;
604 }
605
606 /*
607 * Resume callback from host.
608 *
609 * This function tries to determine if the same card is still present
610 * and, if so, restore all state to it.
611 */
612 static int mmc_resume(struct mmc_host *host)
613 {
614 int err;
615
616 BUG_ON(!host);
617 BUG_ON(!host->card);
618
619 mmc_claim_host(host);
620 err = mmc_init_card(host, host->ocr, host->card);
621 mmc_release_host(host);
622
623 return err;
624 }
625
626 static void mmc_power_restore(struct mmc_host *host)
627 {
628 host->card->state &= ~MMC_STATE_HIGHSPEED;
629 mmc_claim_host(host);
630 mmc_init_card(host, host->ocr, host->card);
631 mmc_release_host(host);
632 }
633
634 static int mmc_sleep(struct mmc_host *host)
635 {
636 struct mmc_card *card = host->card;
637 int err = -ENOSYS;
638
639 if (card && card->ext_csd.rev >= 3) {
640 err = mmc_card_sleepawake(host, 1);
641 if (err < 0)
642 pr_debug("%s: Error %d while putting card into sleep",
643 mmc_hostname(host), err);
644 }
645
646 return err;
647 }
648
649 static int mmc_awake(struct mmc_host *host)
650 {
651 struct mmc_card *card = host->card;
652 int err = -ENOSYS;
653
654 if (card && card->ext_csd.rev >= 3) {
655 err = mmc_card_sleepawake(host, 0);
656 if (err < 0)
657 pr_debug("%s: Error %d while awaking sleeping card",
658 mmc_hostname(host), err);
659 }
660
661 return err;
662 }
663
664 static const struct mmc_bus_ops mmc_ops = {
665 .awake = mmc_awake,
666 .sleep = mmc_sleep,
667 .remove = mmc_remove,
668 .detect = mmc_detect,
669 .suspend = NULL,
670 .resume = NULL,
671 .power_restore = mmc_power_restore,
672 };
673
674 static const struct mmc_bus_ops mmc_ops_unsafe = {
675 .awake = mmc_awake,
676 .sleep = mmc_sleep,
677 .remove = mmc_remove,
678 .detect = mmc_detect,
679 .suspend = mmc_suspend,
680 .resume = mmc_resume,
681 .power_restore = mmc_power_restore,
682 };
683
684 static void mmc_attach_bus_ops(struct mmc_host *host)
685 {
686 const struct mmc_bus_ops *bus_ops;
687
688 if (host->caps & MMC_CAP_NONREMOVABLE || !mmc_assume_removable)
689 bus_ops = &mmc_ops_unsafe;
690 else
691 bus_ops = &mmc_ops;
692 mmc_attach_bus(host, bus_ops);
693 }
694
695 /*
696 * Starting point for MMC card init.
697 */
698 int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
699 {
700 int err;
701
702 BUG_ON(!host);
703 WARN_ON(!host->claimed);
704
705 mmc_attach_bus_ops(host);
706
707 /*
708 * We need to get OCR a different way for SPI.
709 */
710 if (mmc_host_is_spi(host)) {
711 err = mmc_spi_read_ocr(host, 1, &ocr);
712 if (err)
713 goto err;
714 }
715
716 /*
717 * Sanity check the voltages that the card claims to
718 * support.
719 */
720 if (ocr & 0x7F) {
721 printk(KERN_WARNING "%s: card claims to support voltages "
722 "below the defined range. These will be ignored.\n",
723 mmc_hostname(host));
724 ocr &= ~0x7F;
725 }
726
727 host->ocr = mmc_select_voltage(host, ocr);
728
729 /*
730 * Can we support the voltage of the card?
731 */
732 if (!host->ocr) {
733 err = -EINVAL;
734 goto err;
735 }
736
737 /*
738 * Detect and init the card.
739 */
740 err = mmc_init_card(host, host->ocr, NULL);
741 if (err)
742 goto err;
743
744 mmc_release_host(host);
745
746 err = mmc_add_card(host->card);
747 if (err)
748 goto remove_card;
749
750 return 0;
751
752 remove_card:
753 mmc_remove_card(host->card);
754 host->card = NULL;
755 mmc_claim_host(host);
756 err:
757 mmc_detach_bus(host);
758 mmc_release_host(host);
759
760 printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
761 mmc_hostname(host), err);
762
763 return err;
764 }
Linux with added FPC-III support