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mmc: core: Modify the timeout value for writing power class
[deliverable/linux.git] / drivers / mmc / core / mmc.c
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 #include "sd_ops.h"
24
25 static const unsigned int tran_exp[] = {
26 10000, 100000, 1000000, 10000000,
27 0, 0, 0, 0
28 };
29
30 static const unsigned char tran_mant[] = {
31 0, 10, 12, 13, 15, 20, 25, 30,
32 35, 40, 45, 50, 55, 60, 70, 80,
33 };
34
35 static const unsigned int tacc_exp[] = {
36 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
37 };
38
39 static const unsigned int tacc_mant[] = {
40 0, 10, 12, 13, 15, 20, 25, 30,
41 35, 40, 45, 50, 55, 60, 70, 80,
42 };
43
44 #define UNSTUFF_BITS(resp,start,size) \
45 ({ \
46 const int __size = size; \
47 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
48 const int __off = 3 - ((start) / 32); \
49 const int __shft = (start) & 31; \
50 u32 __res; \
51 \
52 __res = resp[__off] >> __shft; \
53 if (__size + __shft > 32) \
54 __res |= resp[__off-1] << ((32 - __shft) % 32); \
55 __res & __mask; \
56 })
57
58 /*
59 * Given the decoded CSD structure, decode the raw CID to our CID structure.
60 */
61 static int mmc_decode_cid(struct mmc_card *card)
62 {
63 u32 *resp = card->raw_cid;
64
65 /*
66 * The selection of the format here is based upon published
67 * specs from sandisk and from what people have reported.
68 */
69 switch (card->csd.mmca_vsn) {
70 case 0: /* MMC v1.0 - v1.2 */
71 case 1: /* MMC v1.4 */
72 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
73 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
74 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
75 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
76 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
77 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
78 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
79 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
80 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
81 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
82 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
83 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
84 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
85 break;
86
87 case 2: /* MMC v2.0 - v2.2 */
88 case 3: /* MMC v3.1 - v3.3 */
89 case 4: /* MMC v4 */
90 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
91 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
92 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
93 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
94 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
95 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
96 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
97 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
98 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
99 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
100 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
101 break;
102
103 default:
104 pr_err("%s: card has unknown MMCA version %d\n",
105 mmc_hostname(card->host), card->csd.mmca_vsn);
106 return -EINVAL;
107 }
108
109 return 0;
110 }
111
112 static void mmc_set_erase_size(struct mmc_card *card)
113 {
114 if (card->ext_csd.erase_group_def & 1)
115 card->erase_size = card->ext_csd.hc_erase_size;
116 else
117 card->erase_size = card->csd.erase_size;
118
119 mmc_init_erase(card);
120 }
121
122 /*
123 * Given a 128-bit response, decode to our card CSD structure.
124 */
125 static int mmc_decode_csd(struct mmc_card *card)
126 {
127 struct mmc_csd *csd = &card->csd;
128 unsigned int e, m, a, b;
129 u32 *resp = card->raw_csd;
130
131 /*
132 * We only understand CSD structure v1.1 and v1.2.
133 * v1.2 has extra information in bits 15, 11 and 10.
134 * We also support eMMC v4.4 & v4.41.
135 */
136 csd->structure = UNSTUFF_BITS(resp, 126, 2);
137 if (csd->structure == 0) {
138 pr_err("%s: unrecognised CSD structure version %d\n",
139 mmc_hostname(card->host), csd->structure);
140 return -EINVAL;
141 }
142
143 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
144 m = UNSTUFF_BITS(resp, 115, 4);
145 e = UNSTUFF_BITS(resp, 112, 3);
146 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
147 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
148
149 m = UNSTUFF_BITS(resp, 99, 4);
150 e = UNSTUFF_BITS(resp, 96, 3);
151 csd->max_dtr = tran_exp[e] * tran_mant[m];
152 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
153
154 e = UNSTUFF_BITS(resp, 47, 3);
155 m = UNSTUFF_BITS(resp, 62, 12);
156 csd->capacity = (1 + m) << (e + 2);
157
158 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
159 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
160 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
161 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
162 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
163 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
164 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
165
166 if (csd->write_blkbits >= 9) {
167 a = UNSTUFF_BITS(resp, 42, 5);
168 b = UNSTUFF_BITS(resp, 37, 5);
169 csd->erase_size = (a + 1) * (b + 1);
170 csd->erase_size <<= csd->write_blkbits - 9;
171 }
172
173 return 0;
174 }
175
176 /*
177 * Read extended CSD.
178 */
179 static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
180 {
181 int err;
182 u8 *ext_csd;
183
184 BUG_ON(!card);
185 BUG_ON(!new_ext_csd);
186
187 *new_ext_csd = NULL;
188
189 if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
190 return 0;
191
192 /*
193 * As the ext_csd is so large and mostly unused, we don't store the
194 * raw block in mmc_card.
195 */
196 ext_csd = kmalloc(512, GFP_KERNEL);
197 if (!ext_csd) {
198 pr_err("%s: could not allocate a buffer to "
199 "receive the ext_csd.\n", mmc_hostname(card->host));
200 return -ENOMEM;
201 }
202
203 err = mmc_send_ext_csd(card, ext_csd);
204 if (err) {
205 kfree(ext_csd);
206 *new_ext_csd = NULL;
207
208 /* If the host or the card can't do the switch,
209 * fail more gracefully. */
210 if ((err != -EINVAL)
211 && (err != -ENOSYS)
212 && (err != -EFAULT))
213 return err;
214
215 /*
216 * High capacity cards should have this "magic" size
217 * stored in their CSD.
218 */
219 if (card->csd.capacity == (4096 * 512)) {
220 pr_err("%s: unable to read EXT_CSD "
221 "on a possible high capacity card. "
222 "Card will be ignored.\n",
223 mmc_hostname(card->host));
224 } else {
225 pr_warning("%s: unable to read "
226 "EXT_CSD, performance might "
227 "suffer.\n",
228 mmc_hostname(card->host));
229 err = 0;
230 }
231 } else
232 *new_ext_csd = ext_csd;
233
234 return err;
235 }
236
237 /*
238 * Decode extended CSD.
239 */
240 static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
241 {
242 int err = 0, idx;
243 unsigned int part_size;
244 u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0;
245
246 BUG_ON(!card);
247
248 if (!ext_csd)
249 return 0;
250
251 /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
252 card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
253 if (card->csd.structure == 3) {
254 if (card->ext_csd.raw_ext_csd_structure > 2) {
255 pr_err("%s: unrecognised EXT_CSD structure "
256 "version %d\n", mmc_hostname(card->host),
257 card->ext_csd.raw_ext_csd_structure);
258 err = -EINVAL;
259 goto out;
260 }
261 }
262
263 card->ext_csd.rev = ext_csd[EXT_CSD_REV];
264 if (card->ext_csd.rev > 6) {
265 pr_err("%s: unrecognised EXT_CSD revision %d\n",
266 mmc_hostname(card->host), card->ext_csd.rev);
267 err = -EINVAL;
268 goto out;
269 }
270
271 card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
272 card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
273 card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
274 card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
275 if (card->ext_csd.rev >= 2) {
276 card->ext_csd.sectors =
277 ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
278 ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
279 ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
280 ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
281
282 /* Cards with density > 2GiB are sector addressed */
283 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
284 mmc_card_set_blockaddr(card);
285 }
286 card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
287 switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
288 case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
289 EXT_CSD_CARD_TYPE_26:
290 card->ext_csd.hs_max_dtr = 52000000;
291 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
292 break;
293 case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
294 EXT_CSD_CARD_TYPE_26:
295 card->ext_csd.hs_max_dtr = 52000000;
296 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
297 break;
298 case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
299 EXT_CSD_CARD_TYPE_26:
300 card->ext_csd.hs_max_dtr = 52000000;
301 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
302 break;
303 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
304 card->ext_csd.hs_max_dtr = 52000000;
305 break;
306 case EXT_CSD_CARD_TYPE_26:
307 card->ext_csd.hs_max_dtr = 26000000;
308 break;
309 default:
310 /* MMC v4 spec says this cannot happen */
311 pr_warning("%s: card is mmc v4 but doesn't "
312 "support any high-speed modes.\n",
313 mmc_hostname(card->host));
314 }
315
316 card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
317 card->ext_csd.raw_erase_timeout_mult =
318 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
319 card->ext_csd.raw_hc_erase_grp_size =
320 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
321 if (card->ext_csd.rev >= 3) {
322 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
323 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
324
325 /* EXT_CSD value is in units of 10ms, but we store in ms */
326 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
327
328 /* Sleep / awake timeout in 100ns units */
329 if (sa_shift > 0 && sa_shift <= 0x17)
330 card->ext_csd.sa_timeout =
331 1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
332 card->ext_csd.erase_group_def =
333 ext_csd[EXT_CSD_ERASE_GROUP_DEF];
334 card->ext_csd.hc_erase_timeout = 300 *
335 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
336 card->ext_csd.hc_erase_size =
337 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
338
339 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
340
341 /*
342 * There are two boot regions of equal size, defined in
343 * multiples of 128K.
344 */
345 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
346 for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
347 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
348 mmc_part_add(card, part_size,
349 EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
350 "boot%d", idx, true);
351 }
352 }
353 }
354
355 card->ext_csd.raw_hc_erase_gap_size =
356 ext_csd[EXT_CSD_PARTITION_ATTRIBUTE];
357 card->ext_csd.raw_sec_trim_mult =
358 ext_csd[EXT_CSD_SEC_TRIM_MULT];
359 card->ext_csd.raw_sec_erase_mult =
360 ext_csd[EXT_CSD_SEC_ERASE_MULT];
361 card->ext_csd.raw_sec_feature_support =
362 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
363 card->ext_csd.raw_trim_mult =
364 ext_csd[EXT_CSD_TRIM_MULT];
365 if (card->ext_csd.rev >= 4) {
366 /*
367 * Enhanced area feature support -- check whether the eMMC
368 * card has the Enhanced area enabled. If so, export enhanced
369 * area offset and size to user by adding sysfs interface.
370 */
371 card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
372 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
373 (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
374 hc_erase_grp_sz =
375 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
376 hc_wp_grp_sz =
377 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
378
379 card->ext_csd.enhanced_area_en = 1;
380 /*
381 * calculate the enhanced data area offset, in bytes
382 */
383 card->ext_csd.enhanced_area_offset =
384 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
385 (ext_csd[137] << 8) + ext_csd[136];
386 if (mmc_card_blockaddr(card))
387 card->ext_csd.enhanced_area_offset <<= 9;
388 /*
389 * calculate the enhanced data area size, in kilobytes
390 */
391 card->ext_csd.enhanced_area_size =
392 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
393 ext_csd[140];
394 card->ext_csd.enhanced_area_size *=
395 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
396 card->ext_csd.enhanced_area_size <<= 9;
397 } else {
398 /*
399 * If the enhanced area is not enabled, disable these
400 * device attributes.
401 */
402 card->ext_csd.enhanced_area_offset = -EINVAL;
403 card->ext_csd.enhanced_area_size = -EINVAL;
404 }
405
406 /*
407 * General purpose partition feature support --
408 * If ext_csd has the size of general purpose partitions,
409 * set size, part_cfg, partition name in mmc_part.
410 */
411 if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
412 EXT_CSD_PART_SUPPORT_PART_EN) {
413 if (card->ext_csd.enhanced_area_en != 1) {
414 hc_erase_grp_sz =
415 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
416 hc_wp_grp_sz =
417 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
418
419 card->ext_csd.enhanced_area_en = 1;
420 }
421
422 for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
423 if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
424 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
425 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
426 continue;
427 part_size =
428 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
429 << 16) +
430 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
431 << 8) +
432 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
433 part_size *= (size_t)(hc_erase_grp_sz *
434 hc_wp_grp_sz);
435 mmc_part_add(card, part_size << 19,
436 EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
437 "gp%d", idx, false);
438 }
439 }
440 card->ext_csd.sec_trim_mult =
441 ext_csd[EXT_CSD_SEC_TRIM_MULT];
442 card->ext_csd.sec_erase_mult =
443 ext_csd[EXT_CSD_SEC_ERASE_MULT];
444 card->ext_csd.sec_feature_support =
445 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
446 card->ext_csd.trim_timeout = 300 *
447 ext_csd[EXT_CSD_TRIM_MULT];
448 }
449
450 if (card->ext_csd.rev >= 5) {
451 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
452 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
453 }
454
455 /* eMMC v4.5 or later */
456 if (card->ext_csd.rev >= 6)
457 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
458
459 card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
460 if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
461 card->erased_byte = 0xFF;
462 else
463 card->erased_byte = 0x0;
464
465 if (card->ext_csd.rev >= 6) {
466 card->ext_csd.generic_cmd6_time = 10 *
467 ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
468 card->ext_csd.power_off_longtime = 10 *
469 ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
470 } else
471 card->ext_csd.generic_cmd6_time = 0;
472
473 out:
474 return err;
475 }
476
477 static inline void mmc_free_ext_csd(u8 *ext_csd)
478 {
479 kfree(ext_csd);
480 }
481
482
483 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
484 {
485 u8 *bw_ext_csd;
486 int err;
487
488 if (bus_width == MMC_BUS_WIDTH_1)
489 return 0;
490
491 err = mmc_get_ext_csd(card, &bw_ext_csd);
492
493 if (err || bw_ext_csd == NULL) {
494 if (bus_width != MMC_BUS_WIDTH_1)
495 err = -EINVAL;
496 goto out;
497 }
498
499 if (bus_width == MMC_BUS_WIDTH_1)
500 goto out;
501
502 /* only compare read only fields */
503 err = (!(card->ext_csd.raw_partition_support ==
504 bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
505 (card->ext_csd.raw_erased_mem_count ==
506 bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
507 (card->ext_csd.rev ==
508 bw_ext_csd[EXT_CSD_REV]) &&
509 (card->ext_csd.raw_ext_csd_structure ==
510 bw_ext_csd[EXT_CSD_STRUCTURE]) &&
511 (card->ext_csd.raw_card_type ==
512 bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
513 (card->ext_csd.raw_s_a_timeout ==
514 bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
515 (card->ext_csd.raw_hc_erase_gap_size ==
516 bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
517 (card->ext_csd.raw_erase_timeout_mult ==
518 bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
519 (card->ext_csd.raw_hc_erase_grp_size ==
520 bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
521 (card->ext_csd.raw_sec_trim_mult ==
522 bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
523 (card->ext_csd.raw_sec_erase_mult ==
524 bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
525 (card->ext_csd.raw_sec_feature_support ==
526 bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
527 (card->ext_csd.raw_trim_mult ==
528 bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
529 (card->ext_csd.raw_sectors[0] ==
530 bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
531 (card->ext_csd.raw_sectors[1] ==
532 bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
533 (card->ext_csd.raw_sectors[2] ==
534 bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
535 (card->ext_csd.raw_sectors[3] ==
536 bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
537 if (err)
538 err = -EINVAL;
539
540 out:
541 mmc_free_ext_csd(bw_ext_csd);
542 return err;
543 }
544
545 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
546 card->raw_cid[2], card->raw_cid[3]);
547 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
548 card->raw_csd[2], card->raw_csd[3]);
549 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
550 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
551 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
552 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
553 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
554 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
555 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
556 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
557 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
558 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
559 card->ext_csd.enhanced_area_offset);
560 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
561
562 static struct attribute *mmc_std_attrs[] = {
563 &dev_attr_cid.attr,
564 &dev_attr_csd.attr,
565 &dev_attr_date.attr,
566 &dev_attr_erase_size.attr,
567 &dev_attr_preferred_erase_size.attr,
568 &dev_attr_fwrev.attr,
569 &dev_attr_hwrev.attr,
570 &dev_attr_manfid.attr,
571 &dev_attr_name.attr,
572 &dev_attr_oemid.attr,
573 &dev_attr_serial.attr,
574 &dev_attr_enhanced_area_offset.attr,
575 &dev_attr_enhanced_area_size.attr,
576 NULL,
577 };
578
579 static struct attribute_group mmc_std_attr_group = {
580 .attrs = mmc_std_attrs,
581 };
582
583 static const struct attribute_group *mmc_attr_groups[] = {
584 &mmc_std_attr_group,
585 NULL,
586 };
587
588 static struct device_type mmc_type = {
589 .groups = mmc_attr_groups,
590 };
591
592 /*
593 * Select the PowerClass for the current bus width
594 * If power class is defined for 4/8 bit bus in the
595 * extended CSD register, select it by executing the
596 * mmc_switch command.
597 */
598 static int mmc_select_powerclass(struct mmc_card *card,
599 unsigned int bus_width, u8 *ext_csd)
600 {
601 int err = 0;
602 unsigned int pwrclass_val;
603 unsigned int index = 0;
604 struct mmc_host *host;
605
606 BUG_ON(!card);
607
608 host = card->host;
609 BUG_ON(!host);
610
611 if (ext_csd == NULL)
612 return 0;
613
614 /* Power class selection is supported for versions >= 4.0 */
615 if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
616 return 0;
617
618 /* Power class values are defined only for 4/8 bit bus */
619 if (bus_width == EXT_CSD_BUS_WIDTH_1)
620 return 0;
621
622 switch (1 << host->ios.vdd) {
623 case MMC_VDD_165_195:
624 if (host->ios.clock <= 26000000)
625 index = EXT_CSD_PWR_CL_26_195;
626 else if (host->ios.clock <= 52000000)
627 index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
628 EXT_CSD_PWR_CL_52_195 :
629 EXT_CSD_PWR_CL_DDR_52_195;
630 else if (host->ios.clock <= 200000000)
631 index = EXT_CSD_PWR_CL_200_195;
632 break;
633 case MMC_VDD_32_33:
634 case MMC_VDD_33_34:
635 case MMC_VDD_34_35:
636 case MMC_VDD_35_36:
637 if (host->ios.clock <= 26000000)
638 index = EXT_CSD_PWR_CL_26_360;
639 else if (host->ios.clock <= 52000000)
640 index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
641 EXT_CSD_PWR_CL_52_360 :
642 EXT_CSD_PWR_CL_DDR_52_360;
643 else if (host->ios.clock <= 200000000)
644 index = EXT_CSD_PWR_CL_200_360;
645 break;
646 default:
647 pr_warning("%s: Voltage range not supported "
648 "for power class.\n", mmc_hostname(host));
649 return -EINVAL;
650 }
651
652 pwrclass_val = ext_csd[index];
653
654 if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
655 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
656 EXT_CSD_PWR_CL_8BIT_SHIFT;
657 else
658 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
659 EXT_CSD_PWR_CL_4BIT_SHIFT;
660
661 /* If the power class is different from the default value */
662 if (pwrclass_val > 0) {
663 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
664 EXT_CSD_POWER_CLASS,
665 pwrclass_val,
666 card->ext_csd.generic_cmd6_time);
667 }
668
669 return err;
670 }
671
672 /*
673 * Handle the detection and initialisation of a card.
674 *
675 * In the case of a resume, "oldcard" will contain the card
676 * we're trying to reinitialise.
677 */
678 static int mmc_init_card(struct mmc_host *host, u32 ocr,
679 struct mmc_card *oldcard)
680 {
681 struct mmc_card *card;
682 int err, ddr = 0;
683 u32 cid[4];
684 unsigned int max_dtr;
685 u32 rocr;
686 u8 *ext_csd = NULL;
687
688 BUG_ON(!host);
689 WARN_ON(!host->claimed);
690
691 /* Set correct bus mode for MMC before attempting init */
692 if (!mmc_host_is_spi(host))
693 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
694
695 /*
696 * Since we're changing the OCR value, we seem to
697 * need to tell some cards to go back to the idle
698 * state. We wait 1ms to give cards time to
699 * respond.
700 * mmc_go_idle is needed for eMMC that are asleep
701 */
702 mmc_go_idle(host);
703
704 /* The extra bit indicates that we support high capacity */
705 err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
706 if (err)
707 goto err;
708
709 /*
710 * For SPI, enable CRC as appropriate.
711 */
712 if (mmc_host_is_spi(host)) {
713 err = mmc_spi_set_crc(host, use_spi_crc);
714 if (err)
715 goto err;
716 }
717
718 /*
719 * Fetch CID from card.
720 */
721 if (mmc_host_is_spi(host))
722 err = mmc_send_cid(host, cid);
723 else
724 err = mmc_all_send_cid(host, cid);
725 if (err)
726 goto err;
727
728 if (oldcard) {
729 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
730 err = -ENOENT;
731 goto err;
732 }
733
734 card = oldcard;
735 } else {
736 /*
737 * Allocate card structure.
738 */
739 card = mmc_alloc_card(host, &mmc_type);
740 if (IS_ERR(card)) {
741 err = PTR_ERR(card);
742 goto err;
743 }
744
745 card->type = MMC_TYPE_MMC;
746 card->rca = 1;
747 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
748 }
749
750 /*
751 * For native busses: set card RCA and quit open drain mode.
752 */
753 if (!mmc_host_is_spi(host)) {
754 err = mmc_set_relative_addr(card);
755 if (err)
756 goto free_card;
757
758 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
759 }
760
761 if (!oldcard) {
762 /*
763 * Fetch CSD from card.
764 */
765 err = mmc_send_csd(card, card->raw_csd);
766 if (err)
767 goto free_card;
768
769 err = mmc_decode_csd(card);
770 if (err)
771 goto free_card;
772 err = mmc_decode_cid(card);
773 if (err)
774 goto free_card;
775 }
776
777 /*
778 * Select card, as all following commands rely on that.
779 */
780 if (!mmc_host_is_spi(host)) {
781 err = mmc_select_card(card);
782 if (err)
783 goto free_card;
784 }
785
786 if (!oldcard) {
787 /*
788 * Fetch and process extended CSD.
789 */
790
791 err = mmc_get_ext_csd(card, &ext_csd);
792 if (err)
793 goto free_card;
794 err = mmc_read_ext_csd(card, ext_csd);
795 if (err)
796 goto free_card;
797
798 /* If doing byte addressing, check if required to do sector
799 * addressing. Handle the case of <2GB cards needing sector
800 * addressing. See section 8.1 JEDEC Standard JED84-A441;
801 * ocr register has bit 30 set for sector addressing.
802 */
803 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
804 mmc_card_set_blockaddr(card);
805
806 /* Erase size depends on CSD and Extended CSD */
807 mmc_set_erase_size(card);
808 }
809
810 /*
811 * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
812 * bit. This bit will be lost every time after a reset or power off.
813 */
814 if (card->ext_csd.enhanced_area_en) {
815 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
816 EXT_CSD_ERASE_GROUP_DEF, 1,
817 card->ext_csd.generic_cmd6_time);
818
819 if (err && err != -EBADMSG)
820 goto free_card;
821
822 if (err) {
823 err = 0;
824 /*
825 * Just disable enhanced area off & sz
826 * will try to enable ERASE_GROUP_DEF
827 * during next time reinit
828 */
829 card->ext_csd.enhanced_area_offset = -EINVAL;
830 card->ext_csd.enhanced_area_size = -EINVAL;
831 } else {
832 card->ext_csd.erase_group_def = 1;
833 /*
834 * enable ERASE_GRP_DEF successfully.
835 * This will affect the erase size, so
836 * here need to reset erase size
837 */
838 mmc_set_erase_size(card);
839 }
840 }
841
842 /*
843 * Ensure eMMC user default partition is enabled
844 */
845 if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
846 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
847 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
848 card->ext_csd.part_config,
849 card->ext_csd.part_time);
850 if (err && err != -EBADMSG)
851 goto free_card;
852 }
853
854 /*
855 * If the host supports the power_off_notify capability then
856 * set the notification byte in the ext_csd register of device
857 */
858 if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) &&
859 (card->poweroff_notify_state == MMC_NO_POWER_NOTIFICATION)) {
860 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
861 EXT_CSD_POWER_OFF_NOTIFICATION,
862 EXT_CSD_POWER_ON,
863 card->ext_csd.generic_cmd6_time);
864 if (err && err != -EBADMSG)
865 goto free_card;
866 }
867
868 if (!err)
869 card->poweroff_notify_state = MMC_POWERED_ON;
870
871 /*
872 * Activate high speed (if supported)
873 */
874 if ((card->ext_csd.hs_max_dtr != 0) &&
875 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
876 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
877 EXT_CSD_HS_TIMING, 1,
878 card->ext_csd.generic_cmd6_time);
879 if (err && err != -EBADMSG)
880 goto free_card;
881
882 if (err) {
883 pr_warning("%s: switch to highspeed failed\n",
884 mmc_hostname(card->host));
885 err = 0;
886 } else {
887 mmc_card_set_highspeed(card);
888 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
889 }
890 }
891
892 /*
893 * Compute bus speed.
894 */
895 max_dtr = (unsigned int)-1;
896
897 if (mmc_card_highspeed(card)) {
898 if (max_dtr > card->ext_csd.hs_max_dtr)
899 max_dtr = card->ext_csd.hs_max_dtr;
900 } else if (max_dtr > card->csd.max_dtr) {
901 max_dtr = card->csd.max_dtr;
902 }
903
904 mmc_set_clock(host, max_dtr);
905
906 /*
907 * Indicate DDR mode (if supported).
908 */
909 if (mmc_card_highspeed(card)) {
910 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
911 && ((host->caps & (MMC_CAP_1_8V_DDR |
912 MMC_CAP_UHS_DDR50))
913 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
914 ddr = MMC_1_8V_DDR_MODE;
915 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
916 && ((host->caps & (MMC_CAP_1_2V_DDR |
917 MMC_CAP_UHS_DDR50))
918 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
919 ddr = MMC_1_2V_DDR_MODE;
920 }
921
922 /*
923 * Activate wide bus and DDR (if supported).
924 */
925 if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
926 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
927 static unsigned ext_csd_bits[][2] = {
928 { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
929 { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
930 { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
931 };
932 static unsigned bus_widths[] = {
933 MMC_BUS_WIDTH_8,
934 MMC_BUS_WIDTH_4,
935 MMC_BUS_WIDTH_1
936 };
937 unsigned idx, bus_width = 0;
938
939 if (host->caps & MMC_CAP_8_BIT_DATA)
940 idx = 0;
941 else
942 idx = 1;
943 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
944 bus_width = bus_widths[idx];
945 if (bus_width == MMC_BUS_WIDTH_1)
946 ddr = 0; /* no DDR for 1-bit width */
947 err = mmc_select_powerclass(card, ext_csd_bits[idx][0],
948 ext_csd);
949 if (err)
950 pr_err("%s: power class selection to "
951 "bus width %d failed\n",
952 mmc_hostname(card->host),
953 1 << bus_width);
954
955 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
956 EXT_CSD_BUS_WIDTH,
957 ext_csd_bits[idx][0],
958 card->ext_csd.generic_cmd6_time);
959 if (!err) {
960 mmc_set_bus_width(card->host, bus_width);
961
962 /*
963 * If controller can't handle bus width test,
964 * compare ext_csd previously read in 1 bit mode
965 * against ext_csd at new bus width
966 */
967 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
968 err = mmc_compare_ext_csds(card,
969 bus_width);
970 else
971 err = mmc_bus_test(card, bus_width);
972 if (!err)
973 break;
974 }
975 }
976
977 if (!err && ddr) {
978 err = mmc_select_powerclass(card, ext_csd_bits[idx][1],
979 ext_csd);
980 if (err)
981 pr_err("%s: power class selection to "
982 "bus width %d ddr %d failed\n",
983 mmc_hostname(card->host),
984 1 << bus_width, ddr);
985
986 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
987 EXT_CSD_BUS_WIDTH,
988 ext_csd_bits[idx][1],
989 card->ext_csd.generic_cmd6_time);
990 }
991 if (err) {
992 pr_warning("%s: switch to bus width %d ddr %d "
993 "failed\n", mmc_hostname(card->host),
994 1 << bus_width, ddr);
995 goto free_card;
996 } else if (ddr) {
997 /*
998 * eMMC cards can support 3.3V to 1.2V i/o (vccq)
999 * signaling.
1000 *
1001 * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1002 *
1003 * 1.8V vccq at 3.3V core voltage (vcc) is not required
1004 * in the JEDEC spec for DDR.
1005 *
1006 * Do not force change in vccq since we are obviously
1007 * working and no change to vccq is needed.
1008 *
1009 * WARNING: eMMC rules are NOT the same as SD DDR
1010 */
1011 if (ddr == EXT_CSD_CARD_TYPE_DDR_1_2V) {
1012 err = mmc_set_signal_voltage(host,
1013 MMC_SIGNAL_VOLTAGE_120, 0);
1014 if (err)
1015 goto err;
1016 }
1017 mmc_card_set_ddr_mode(card);
1018 mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
1019 mmc_set_bus_width(card->host, bus_width);
1020 }
1021 }
1022
1023 if (!oldcard)
1024 host->card = card;
1025
1026 mmc_free_ext_csd(ext_csd);
1027 return 0;
1028
1029 free_card:
1030 if (!oldcard)
1031 mmc_remove_card(card);
1032 err:
1033 mmc_free_ext_csd(ext_csd);
1034
1035 return err;
1036 }
1037
1038 /*
1039 * Host is being removed. Free up the current card.
1040 */
1041 static void mmc_remove(struct mmc_host *host)
1042 {
1043 BUG_ON(!host);
1044 BUG_ON(!host->card);
1045
1046 mmc_remove_card(host->card);
1047 host->card = NULL;
1048 }
1049
1050 /*
1051 * Card detection callback from host.
1052 */
1053 static void mmc_detect(struct mmc_host *host)
1054 {
1055 int err;
1056
1057 BUG_ON(!host);
1058 BUG_ON(!host->card);
1059
1060 mmc_claim_host(host);
1061
1062 /*
1063 * Just check if our card has been removed.
1064 */
1065 err = mmc_send_status(host->card, NULL);
1066
1067 mmc_release_host(host);
1068
1069 if (err) {
1070 mmc_remove(host);
1071
1072 mmc_claim_host(host);
1073 mmc_detach_bus(host);
1074 mmc_power_off(host);
1075 mmc_release_host(host);
1076 }
1077 }
1078
1079 /*
1080 * Suspend callback from host.
1081 */
1082 static int mmc_suspend(struct mmc_host *host)
1083 {
1084 int err = 0;
1085
1086 BUG_ON(!host);
1087 BUG_ON(!host->card);
1088
1089 mmc_claim_host(host);
1090 if (mmc_card_can_sleep(host))
1091 err = mmc_card_sleep(host);
1092 else if (!mmc_host_is_spi(host))
1093 mmc_deselect_cards(host);
1094 host->card->state &= ~MMC_STATE_HIGHSPEED;
1095 mmc_release_host(host);
1096
1097 return err;
1098 }
1099
1100 /*
1101 * Resume callback from host.
1102 *
1103 * This function tries to determine if the same card is still present
1104 * and, if so, restore all state to it.
1105 */
1106 static int mmc_resume(struct mmc_host *host)
1107 {
1108 int err;
1109
1110 BUG_ON(!host);
1111 BUG_ON(!host->card);
1112
1113 mmc_claim_host(host);
1114 err = mmc_init_card(host, host->ocr, host->card);
1115 mmc_release_host(host);
1116
1117 return err;
1118 }
1119
1120 static int mmc_power_restore(struct mmc_host *host)
1121 {
1122 int ret;
1123
1124 host->card->state &= ~MMC_STATE_HIGHSPEED;
1125 mmc_claim_host(host);
1126 ret = mmc_init_card(host, host->ocr, host->card);
1127 mmc_release_host(host);
1128
1129 return ret;
1130 }
1131
1132 static int mmc_sleep(struct mmc_host *host)
1133 {
1134 struct mmc_card *card = host->card;
1135 int err = -ENOSYS;
1136
1137 if (card && card->ext_csd.rev >= 3) {
1138 err = mmc_card_sleepawake(host, 1);
1139 if (err < 0)
1140 pr_debug("%s: Error %d while putting card into sleep",
1141 mmc_hostname(host), err);
1142 }
1143
1144 return err;
1145 }
1146
1147 static int mmc_awake(struct mmc_host *host)
1148 {
1149 struct mmc_card *card = host->card;
1150 int err = -ENOSYS;
1151
1152 if (card && card->ext_csd.rev >= 3) {
1153 err = mmc_card_sleepawake(host, 0);
1154 if (err < 0)
1155 pr_debug("%s: Error %d while awaking sleeping card",
1156 mmc_hostname(host), err);
1157 }
1158
1159 return err;
1160 }
1161
1162 static const struct mmc_bus_ops mmc_ops = {
1163 .awake = mmc_awake,
1164 .sleep = mmc_sleep,
1165 .remove = mmc_remove,
1166 .detect = mmc_detect,
1167 .suspend = NULL,
1168 .resume = NULL,
1169 .power_restore = mmc_power_restore,
1170 };
1171
1172 static const struct mmc_bus_ops mmc_ops_unsafe = {
1173 .awake = mmc_awake,
1174 .sleep = mmc_sleep,
1175 .remove = mmc_remove,
1176 .detect = mmc_detect,
1177 .suspend = mmc_suspend,
1178 .resume = mmc_resume,
1179 .power_restore = mmc_power_restore,
1180 };
1181
1182 static void mmc_attach_bus_ops(struct mmc_host *host)
1183 {
1184 const struct mmc_bus_ops *bus_ops;
1185
1186 if (!mmc_card_is_removable(host))
1187 bus_ops = &mmc_ops_unsafe;
1188 else
1189 bus_ops = &mmc_ops;
1190 mmc_attach_bus(host, bus_ops);
1191 }
1192
1193 /*
1194 * Starting point for MMC card init.
1195 */
1196 int mmc_attach_mmc(struct mmc_host *host)
1197 {
1198 int err;
1199 u32 ocr;
1200
1201 BUG_ON(!host);
1202 WARN_ON(!host->claimed);
1203
1204 /* Set correct bus mode for MMC before attempting attach */
1205 if (!mmc_host_is_spi(host))
1206 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1207
1208 err = mmc_send_op_cond(host, 0, &ocr);
1209 if (err)
1210 return err;
1211
1212 mmc_attach_bus_ops(host);
1213 if (host->ocr_avail_mmc)
1214 host->ocr_avail = host->ocr_avail_mmc;
1215
1216 /*
1217 * We need to get OCR a different way for SPI.
1218 */
1219 if (mmc_host_is_spi(host)) {
1220 err = mmc_spi_read_ocr(host, 1, &ocr);
1221 if (err)
1222 goto err;
1223 }
1224
1225 /*
1226 * Sanity check the voltages that the card claims to
1227 * support.
1228 */
1229 if (ocr & 0x7F) {
1230 pr_warning("%s: card claims to support voltages "
1231 "below the defined range. These will be ignored.\n",
1232 mmc_hostname(host));
1233 ocr &= ~0x7F;
1234 }
1235
1236 host->ocr = mmc_select_voltage(host, ocr);
1237
1238 /*
1239 * Can we support the voltage of the card?
1240 */
1241 if (!host->ocr) {
1242 err = -EINVAL;
1243 goto err;
1244 }
1245
1246 /*
1247 * Detect and init the card.
1248 */
1249 err = mmc_init_card(host, host->ocr, NULL);
1250 if (err)
1251 goto err;
1252
1253 mmc_release_host(host);
1254 err = mmc_add_card(host->card);
1255 mmc_claim_host(host);
1256 if (err)
1257 goto remove_card;
1258
1259 return 0;
1260
1261 remove_card:
1262 mmc_release_host(host);
1263 mmc_remove_card(host->card);
1264 mmc_claim_host(host);
1265 host->card = NULL;
1266 err:
1267 mmc_detach_bus(host);
1268
1269 pr_err("%s: error %d whilst initialising MMC card\n",
1270 mmc_hostname(host), err);
1271
1272 return err;
1273 }
Linux kernel - Deliverables
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