mmc: core: Fix power_off_notify during suspend
[linux-2.6.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 #include <linux/stat.h>
16
17 #include <linux/mmc/host.h>
18 #include <linux/mmc/card.h>
19 #include <linux/mmc/mmc.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 static int mmc_decode_cid(struct mmc_card *card)
63 {
64         u32 *resp = card->raw_cid;
65
66         /*
67          * The selection of the format here is based upon published
68          * specs from sandisk and from what people have reported.
69          */
70         switch (card->csd.mmca_vsn) {
71         case 0: /* MMC v1.0 - v1.2 */
72         case 1: /* MMC v1.4 */
73                 card->cid.manfid        = UNSTUFF_BITS(resp, 104, 24);
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.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
80                 card->cid.prod_name[6]  = UNSTUFF_BITS(resp, 48, 8);
81                 card->cid.hwrev         = UNSTUFF_BITS(resp, 44, 4);
82                 card->cid.fwrev         = UNSTUFF_BITS(resp, 40, 4);
83                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 24);
84                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
85                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
86                 break;
87
88         case 2: /* MMC v2.0 - v2.2 */
89         case 3: /* MMC v3.1 - v3.3 */
90         case 4: /* MMC v4 */
91                 card->cid.manfid        = UNSTUFF_BITS(resp, 120, 8);
92                 card->cid.oemid         = UNSTUFF_BITS(resp, 104, 16);
93                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
94                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
95                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
96                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
97                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
98                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
99                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 32);
100                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
101                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
102                 break;
103
104         default:
105                 pr_err("%s: card has unknown MMCA version %d\n",
106                         mmc_hostname(card->host), card->csd.mmca_vsn);
107                 return -EINVAL;
108         }
109
110         return 0;
111 }
112
113 static void mmc_set_erase_size(struct mmc_card *card)
114 {
115         if (card->ext_csd.erase_group_def & 1)
116                 card->erase_size = card->ext_csd.hc_erase_size;
117         else
118                 card->erase_size = card->csd.erase_size;
119
120         mmc_init_erase(card);
121 }
122
123 /*
124  * Given a 128-bit response, decode to our card CSD structure.
125  */
126 static int mmc_decode_csd(struct mmc_card *card)
127 {
128         struct mmc_csd *csd = &card->csd;
129         unsigned int e, m, a, b;
130         u32 *resp = card->raw_csd;
131
132         /*
133          * We only understand CSD structure v1.1 and v1.2.
134          * v1.2 has extra information in bits 15, 11 and 10.
135          * We also support eMMC v4.4 & v4.41.
136          */
137         csd->structure = UNSTUFF_BITS(resp, 126, 2);
138         if (csd->structure == 0) {
139                 pr_err("%s: unrecognised CSD structure version %d\n",
140                         mmc_hostname(card->host), csd->structure);
141                 return -EINVAL;
142         }
143
144         csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
145         m = UNSTUFF_BITS(resp, 115, 4);
146         e = UNSTUFF_BITS(resp, 112, 3);
147         csd->tacc_ns     = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
148         csd->tacc_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
149
150         m = UNSTUFF_BITS(resp, 99, 4);
151         e = UNSTUFF_BITS(resp, 96, 3);
152         csd->max_dtr      = tran_exp[e] * tran_mant[m];
153         csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
154
155         e = UNSTUFF_BITS(resp, 47, 3);
156         m = UNSTUFF_BITS(resp, 62, 12);
157         csd->capacity     = (1 + m) << (e + 2);
158
159         csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
160         csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
161         csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
162         csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
163         csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
164         csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
165         csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
166
167         if (csd->write_blkbits >= 9) {
168                 a = UNSTUFF_BITS(resp, 42, 5);
169                 b = UNSTUFF_BITS(resp, 37, 5);
170                 csd->erase_size = (a + 1) * (b + 1);
171                 csd->erase_size <<= csd->write_blkbits - 9;
172         }
173
174         return 0;
175 }
176
177 /*
178  * Read extended CSD.
179  */
180 static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
181 {
182         int err;
183         u8 *ext_csd;
184
185         BUG_ON(!card);
186         BUG_ON(!new_ext_csd);
187
188         *new_ext_csd = NULL;
189
190         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
191                 return 0;
192
193         /*
194          * As the ext_csd is so large and mostly unused, we don't store the
195          * raw block in mmc_card.
196          */
197         ext_csd = kmalloc(512, GFP_KERNEL);
198         if (!ext_csd) {
199                 pr_err("%s: could not allocate a buffer to "
200                         "receive the ext_csd.\n", mmc_hostname(card->host));
201                 return -ENOMEM;
202         }
203
204         err = mmc_send_ext_csd(card, ext_csd);
205         if (err) {
206                 kfree(ext_csd);
207                 *new_ext_csd = NULL;
208
209                 /* If the host or the card can't do the switch,
210                  * fail more gracefully. */
211                 if ((err != -EINVAL)
212                  && (err != -ENOSYS)
213                  && (err != -EFAULT))
214                         return err;
215
216                 /*
217                  * High capacity cards should have this "magic" size
218                  * stored in their CSD.
219                  */
220                 if (card->csd.capacity == (4096 * 512)) {
221                         pr_err("%s: unable to read EXT_CSD "
222                                 "on a possible high capacity card. "
223                                 "Card will be ignored.\n",
224                                 mmc_hostname(card->host));
225                 } else {
226                         pr_warning("%s: unable to read "
227                                 "EXT_CSD, performance might "
228                                 "suffer.\n",
229                                 mmc_hostname(card->host));
230                         err = 0;
231                 }
232         } else
233                 *new_ext_csd = ext_csd;
234
235         return err;
236 }
237
238 /*
239  * Decode extended CSD.
240  */
241 static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
242 {
243         int err = 0, idx;
244         unsigned int part_size;
245         u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0;
246
247         BUG_ON(!card);
248
249         if (!ext_csd)
250                 return 0;
251
252         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
253         card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
254         if (card->csd.structure == 3) {
255                 if (card->ext_csd.raw_ext_csd_structure > 2) {
256                         pr_err("%s: unrecognised EXT_CSD structure "
257                                 "version %d\n", mmc_hostname(card->host),
258                                         card->ext_csd.raw_ext_csd_structure);
259                         err = -EINVAL;
260                         goto out;
261                 }
262         }
263
264         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
265         if (card->ext_csd.rev > 6) {
266                 pr_err("%s: unrecognised EXT_CSD revision %d\n",
267                         mmc_hostname(card->host), card->ext_csd.rev);
268                 err = -EINVAL;
269                 goto out;
270         }
271
272         card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
273         card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
274         card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
275         card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
276         if (card->ext_csd.rev >= 2) {
277                 card->ext_csd.sectors =
278                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
279                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
280                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
281                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
282
283                 /* Cards with density > 2GiB are sector addressed */
284                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
285                         mmc_card_set_blockaddr(card);
286         }
287         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
288         switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
289         case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
290              EXT_CSD_CARD_TYPE_26:
291                 card->ext_csd.hs_max_dtr = 52000000;
292                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
293                 break;
294         case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
295              EXT_CSD_CARD_TYPE_26:
296                 card->ext_csd.hs_max_dtr = 52000000;
297                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
298                 break;
299         case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
300              EXT_CSD_CARD_TYPE_26:
301                 card->ext_csd.hs_max_dtr = 52000000;
302                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
303                 break;
304         case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
305                 card->ext_csd.hs_max_dtr = 52000000;
306                 break;
307         case EXT_CSD_CARD_TYPE_26:
308                 card->ext_csd.hs_max_dtr = 26000000;
309                 break;
310         default:
311                 /* MMC v4 spec says this cannot happen */
312                 pr_warning("%s: card is mmc v4 but doesn't "
313                         "support any high-speed modes.\n",
314                         mmc_hostname(card->host));
315         }
316
317         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
318         card->ext_csd.raw_erase_timeout_mult =
319                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
320         card->ext_csd.raw_hc_erase_grp_size =
321                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
322         if (card->ext_csd.rev >= 3) {
323                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
324                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
325
326                 /* EXT_CSD value is in units of 10ms, but we store in ms */
327                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
328
329                 /* Sleep / awake timeout in 100ns units */
330                 if (sa_shift > 0 && sa_shift <= 0x17)
331                         card->ext_csd.sa_timeout =
332                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
333                 card->ext_csd.erase_group_def =
334                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
335                 card->ext_csd.hc_erase_timeout = 300 *
336                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
337                 card->ext_csd.hc_erase_size =
338                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
339
340                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
341
342                 /*
343                  * There are two boot regions of equal size, defined in
344                  * multiples of 128K.
345                  */
346                 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
347                         for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
348                                 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
349                                 mmc_part_add(card, part_size,
350                                         EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
351                                         "boot%d", idx, true);
352                         }
353                 }
354         }
355
356         card->ext_csd.raw_hc_erase_gap_size =
357                 ext_csd[EXT_CSD_PARTITION_ATTRIBUTE];
358         card->ext_csd.raw_sec_trim_mult =
359                 ext_csd[EXT_CSD_SEC_TRIM_MULT];
360         card->ext_csd.raw_sec_erase_mult =
361                 ext_csd[EXT_CSD_SEC_ERASE_MULT];
362         card->ext_csd.raw_sec_feature_support =
363                 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
364         card->ext_csd.raw_trim_mult =
365                 ext_csd[EXT_CSD_TRIM_MULT];
366         if (card->ext_csd.rev >= 4) {
367                 /*
368                  * Enhanced area feature support -- check whether the eMMC
369                  * card has the Enhanced area enabled.  If so, export enhanced
370                  * area offset and size to user by adding sysfs interface.
371                  */
372                 card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
373                 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
374                     (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
375                         hc_erase_grp_sz =
376                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
377                         hc_wp_grp_sz =
378                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
379
380                         card->ext_csd.enhanced_area_en = 1;
381                         /*
382                          * calculate the enhanced data area offset, in bytes
383                          */
384                         card->ext_csd.enhanced_area_offset =
385                                 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
386                                 (ext_csd[137] << 8) + ext_csd[136];
387                         if (mmc_card_blockaddr(card))
388                                 card->ext_csd.enhanced_area_offset <<= 9;
389                         /*
390                          * calculate the enhanced data area size, in kilobytes
391                          */
392                         card->ext_csd.enhanced_area_size =
393                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
394                                 ext_csd[140];
395                         card->ext_csd.enhanced_area_size *=
396                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
397                         card->ext_csd.enhanced_area_size <<= 9;
398                 } else {
399                         /*
400                          * If the enhanced area is not enabled, disable these
401                          * device attributes.
402                          */
403                         card->ext_csd.enhanced_area_offset = -EINVAL;
404                         card->ext_csd.enhanced_area_size = -EINVAL;
405                 }
406
407                 /*
408                  * General purpose partition feature support --
409                  * If ext_csd has the size of general purpose partitions,
410                  * set size, part_cfg, partition name in mmc_part.
411                  */
412                 if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
413                         EXT_CSD_PART_SUPPORT_PART_EN) {
414                         if (card->ext_csd.enhanced_area_en != 1) {
415                                 hc_erase_grp_sz =
416                                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
417                                 hc_wp_grp_sz =
418                                         ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
419
420                                 card->ext_csd.enhanced_area_en = 1;
421                         }
422
423                         for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
424                                 if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
425                                 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
426                                 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
427                                         continue;
428                                 part_size =
429                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
430                                         << 16) +
431                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
432                                         << 8) +
433                                 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
434                                 part_size *= (size_t)(hc_erase_grp_sz *
435                                         hc_wp_grp_sz);
436                                 mmc_part_add(card, part_size << 19,
437                                         EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
438                                         "gp%d", idx, false);
439                         }
440                 }
441                 card->ext_csd.sec_trim_mult =
442                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
443                 card->ext_csd.sec_erase_mult =
444                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
445                 card->ext_csd.sec_feature_support =
446                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
447                 card->ext_csd.trim_timeout = 300 *
448                         ext_csd[EXT_CSD_TRIM_MULT];
449         }
450
451         if (card->ext_csd.rev >= 5) {
452                 /* check whether the eMMC card supports HPI */
453                 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) {
454                         card->ext_csd.hpi = 1;
455                         if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
456                                 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
457                         else
458                                 card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
459                         /*
460                          * Indicate the maximum timeout to close
461                          * a command interrupted by HPI
462                          */
463                         card->ext_csd.out_of_int_time =
464                                 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
465                 }
466
467                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
468                 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
469         }
470
471         card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
472         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
473                 card->erased_byte = 0xFF;
474         else
475                 card->erased_byte = 0x0;
476
477         /* eMMC v4.5 or later */
478         if (card->ext_csd.rev >= 6) {
479                 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
480
481                 card->ext_csd.generic_cmd6_time = 10 *
482                         ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
483                 card->ext_csd.power_off_longtime = 10 *
484                         ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
485
486                 card->ext_csd.cache_size =
487                         ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
488                         ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
489                         ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
490                         ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
491         }
492
493 out:
494         return err;
495 }
496
497 static inline void mmc_free_ext_csd(u8 *ext_csd)
498 {
499         kfree(ext_csd);
500 }
501
502
503 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
504 {
505         u8 *bw_ext_csd;
506         int err;
507
508         if (bus_width == MMC_BUS_WIDTH_1)
509                 return 0;
510
511         err = mmc_get_ext_csd(card, &bw_ext_csd);
512
513         if (err || bw_ext_csd == NULL) {
514                 if (bus_width != MMC_BUS_WIDTH_1)
515                         err = -EINVAL;
516                 goto out;
517         }
518
519         if (bus_width == MMC_BUS_WIDTH_1)
520                 goto out;
521
522         /* only compare read only fields */
523         err = (!(card->ext_csd.raw_partition_support ==
524                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
525                 (card->ext_csd.raw_erased_mem_count ==
526                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
527                 (card->ext_csd.rev ==
528                         bw_ext_csd[EXT_CSD_REV]) &&
529                 (card->ext_csd.raw_ext_csd_structure ==
530                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
531                 (card->ext_csd.raw_card_type ==
532                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
533                 (card->ext_csd.raw_s_a_timeout ==
534                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
535                 (card->ext_csd.raw_hc_erase_gap_size ==
536                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
537                 (card->ext_csd.raw_erase_timeout_mult ==
538                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
539                 (card->ext_csd.raw_hc_erase_grp_size ==
540                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
541                 (card->ext_csd.raw_sec_trim_mult ==
542                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
543                 (card->ext_csd.raw_sec_erase_mult ==
544                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
545                 (card->ext_csd.raw_sec_feature_support ==
546                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
547                 (card->ext_csd.raw_trim_mult ==
548                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
549                 (card->ext_csd.raw_sectors[0] ==
550                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
551                 (card->ext_csd.raw_sectors[1] ==
552                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
553                 (card->ext_csd.raw_sectors[2] ==
554                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
555                 (card->ext_csd.raw_sectors[3] ==
556                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
557         if (err)
558                 err = -EINVAL;
559
560 out:
561         mmc_free_ext_csd(bw_ext_csd);
562         return err;
563 }
564
565 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
566         card->raw_cid[2], card->raw_cid[3]);
567 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
568         card->raw_csd[2], card->raw_csd[3]);
569 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
570 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
571 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
572 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
573 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
574 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
575 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
576 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
577 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
578 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
579                 card->ext_csd.enhanced_area_offset);
580 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
581
582 static struct attribute *mmc_std_attrs[] = {
583         &dev_attr_cid.attr,
584         &dev_attr_csd.attr,
585         &dev_attr_date.attr,
586         &dev_attr_erase_size.attr,
587         &dev_attr_preferred_erase_size.attr,
588         &dev_attr_fwrev.attr,
589         &dev_attr_hwrev.attr,
590         &dev_attr_manfid.attr,
591         &dev_attr_name.attr,
592         &dev_attr_oemid.attr,
593         &dev_attr_serial.attr,
594         &dev_attr_enhanced_area_offset.attr,
595         &dev_attr_enhanced_area_size.attr,
596         NULL,
597 };
598
599 static struct attribute_group mmc_std_attr_group = {
600         .attrs = mmc_std_attrs,
601 };
602
603 static const struct attribute_group *mmc_attr_groups[] = {
604         &mmc_std_attr_group,
605         NULL,
606 };
607
608 static struct device_type mmc_type = {
609         .groups = mmc_attr_groups,
610 };
611
612 /*
613  * Select the PowerClass for the current bus width
614  * If power class is defined for 4/8 bit bus in the
615  * extended CSD register, select it by executing the
616  * mmc_switch command.
617  */
618 static int mmc_select_powerclass(struct mmc_card *card,
619                 unsigned int bus_width, u8 *ext_csd)
620 {
621         int err = 0;
622         unsigned int pwrclass_val;
623         unsigned int index = 0;
624         struct mmc_host *host;
625
626         BUG_ON(!card);
627
628         host = card->host;
629         BUG_ON(!host);
630
631         if (ext_csd == NULL)
632                 return 0;
633
634         /* Power class selection is supported for versions >= 4.0 */
635         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
636                 return 0;
637
638         /* Power class values are defined only for 4/8 bit bus */
639         if (bus_width == EXT_CSD_BUS_WIDTH_1)
640                 return 0;
641
642         switch (1 << host->ios.vdd) {
643         case MMC_VDD_165_195:
644                 if (host->ios.clock <= 26000000)
645                         index = EXT_CSD_PWR_CL_26_195;
646                 else if (host->ios.clock <= 52000000)
647                         index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
648                                 EXT_CSD_PWR_CL_52_195 :
649                                 EXT_CSD_PWR_CL_DDR_52_195;
650                 else if (host->ios.clock <= 200000000)
651                         index = EXT_CSD_PWR_CL_200_195;
652                 break;
653         case MMC_VDD_32_33:
654         case MMC_VDD_33_34:
655         case MMC_VDD_34_35:
656         case MMC_VDD_35_36:
657                 if (host->ios.clock <= 26000000)
658                         index = EXT_CSD_PWR_CL_26_360;
659                 else if (host->ios.clock <= 52000000)
660                         index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
661                                 EXT_CSD_PWR_CL_52_360 :
662                                 EXT_CSD_PWR_CL_DDR_52_360;
663                 else if (host->ios.clock <= 200000000)
664                         index = EXT_CSD_PWR_CL_200_360;
665                 break;
666         default:
667                 pr_warning("%s: Voltage range not supported "
668                            "for power class.\n", mmc_hostname(host));
669                 return -EINVAL;
670         }
671
672         pwrclass_val = ext_csd[index];
673
674         if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
675                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
676                                 EXT_CSD_PWR_CL_8BIT_SHIFT;
677         else
678                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
679                                 EXT_CSD_PWR_CL_4BIT_SHIFT;
680
681         /* If the power class is different from the default value */
682         if (pwrclass_val > 0) {
683                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
684                                  EXT_CSD_POWER_CLASS,
685                                  pwrclass_val,
686                                  card->ext_csd.generic_cmd6_time);
687         }
688
689         return err;
690 }
691
692 /*
693  * Handle the detection and initialisation of a card.
694  *
695  * In the case of a resume, "oldcard" will contain the card
696  * we're trying to reinitialise.
697  */
698 static int mmc_init_card(struct mmc_host *host, u32 ocr,
699         struct mmc_card *oldcard)
700 {
701         struct mmc_card *card;
702         int err, ddr = 0;
703         u32 cid[4];
704         unsigned int max_dtr;
705         u32 rocr;
706         u8 *ext_csd = NULL;
707
708         BUG_ON(!host);
709         WARN_ON(!host->claimed);
710
711         /* Set correct bus mode for MMC before attempting init */
712         if (!mmc_host_is_spi(host))
713                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
714
715         /*
716          * Since we're changing the OCR value, we seem to
717          * need to tell some cards to go back to the idle
718          * state.  We wait 1ms to give cards time to
719          * respond.
720          * mmc_go_idle is needed for eMMC that are asleep
721          */
722         mmc_go_idle(host);
723
724         /* The extra bit indicates that we support high capacity */
725         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
726         if (err)
727                 goto err;
728
729         /*
730          * For SPI, enable CRC as appropriate.
731          */
732         if (mmc_host_is_spi(host)) {
733                 err = mmc_spi_set_crc(host, use_spi_crc);
734                 if (err)
735                         goto err;
736         }
737
738         /*
739          * Fetch CID from card.
740          */
741         if (mmc_host_is_spi(host))
742                 err = mmc_send_cid(host, cid);
743         else
744                 err = mmc_all_send_cid(host, cid);
745         if (err)
746                 goto err;
747
748         if (oldcard) {
749                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
750                         err = -ENOENT;
751                         goto err;
752                 }
753
754                 card = oldcard;
755         } else {
756                 /*
757                  * Allocate card structure.
758                  */
759                 card = mmc_alloc_card(host, &mmc_type);
760                 if (IS_ERR(card)) {
761                         err = PTR_ERR(card);
762                         goto err;
763                 }
764
765                 card->type = MMC_TYPE_MMC;
766                 card->rca = 1;
767                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
768         }
769
770         /*
771          * For native busses:  set card RCA and quit open drain mode.
772          */
773         if (!mmc_host_is_spi(host)) {
774                 err = mmc_set_relative_addr(card);
775                 if (err)
776                         goto free_card;
777
778                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
779         }
780
781         if (!oldcard) {
782                 /*
783                  * Fetch CSD from card.
784                  */
785                 err = mmc_send_csd(card, card->raw_csd);
786                 if (err)
787                         goto free_card;
788
789                 err = mmc_decode_csd(card);
790                 if (err)
791                         goto free_card;
792                 err = mmc_decode_cid(card);
793                 if (err)
794                         goto free_card;
795         }
796
797         /*
798          * Select card, as all following commands rely on that.
799          */
800         if (!mmc_host_is_spi(host)) {
801                 err = mmc_select_card(card);
802                 if (err)
803                         goto free_card;
804         }
805
806         if (!oldcard) {
807                 /*
808                  * Fetch and process extended CSD.
809                  */
810
811                 err = mmc_get_ext_csd(card, &ext_csd);
812                 if (err)
813                         goto free_card;
814                 err = mmc_read_ext_csd(card, ext_csd);
815                 if (err)
816                         goto free_card;
817
818                 /* If doing byte addressing, check if required to do sector
819                  * addressing.  Handle the case of <2GB cards needing sector
820                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
821                  * ocr register has bit 30 set for sector addressing.
822                  */
823                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
824                         mmc_card_set_blockaddr(card);
825
826                 /* Erase size depends on CSD and Extended CSD */
827                 mmc_set_erase_size(card);
828         }
829
830         /*
831          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
832          * bit.  This bit will be lost every time after a reset or power off.
833          */
834         if (card->ext_csd.enhanced_area_en) {
835                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
836                                  EXT_CSD_ERASE_GROUP_DEF, 1,
837                                  card->ext_csd.generic_cmd6_time);
838
839                 if (err && err != -EBADMSG)
840                         goto free_card;
841
842                 if (err) {
843                         err = 0;
844                         /*
845                          * Just disable enhanced area off & sz
846                          * will try to enable ERASE_GROUP_DEF
847                          * during next time reinit
848                          */
849                         card->ext_csd.enhanced_area_offset = -EINVAL;
850                         card->ext_csd.enhanced_area_size = -EINVAL;
851                 } else {
852                         card->ext_csd.erase_group_def = 1;
853                         /*
854                          * enable ERASE_GRP_DEF successfully.
855                          * This will affect the erase size, so
856                          * here need to reset erase size
857                          */
858                         mmc_set_erase_size(card);
859                 }
860         }
861
862         /*
863          * Ensure eMMC user default partition is enabled
864          */
865         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
866                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
867                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
868                                  card->ext_csd.part_config,
869                                  card->ext_csd.part_time);
870                 if (err && err != -EBADMSG)
871                         goto free_card;
872         }
873
874         /*
875          * If the host supports the power_off_notify capability then
876          * set the notification byte in the ext_csd register of device
877          */
878         if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) &&
879             (card->ext_csd.rev >= 6)) {
880                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
881                                  EXT_CSD_POWER_OFF_NOTIFICATION,
882                                  EXT_CSD_POWER_ON,
883                                  card->ext_csd.generic_cmd6_time);
884                 if (err && err != -EBADMSG)
885                         goto free_card;
886
887                 /*
888                  * The err can be -EBADMSG or 0,
889                  * so check for success and update the flag
890                  */
891                 if (!err)
892                         card->poweroff_notify_state = MMC_POWERED_ON;
893         }
894
895         /*
896          * Activate high speed (if supported)
897          */
898         if ((card->ext_csd.hs_max_dtr != 0) &&
899                 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
900                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
901                                  EXT_CSD_HS_TIMING, 1,
902                                  card->ext_csd.generic_cmd6_time);
903                 if (err && err != -EBADMSG)
904                         goto free_card;
905
906                 if (err) {
907                         pr_warning("%s: switch to highspeed failed\n",
908                                mmc_hostname(card->host));
909                         err = 0;
910                 } else {
911                         mmc_card_set_highspeed(card);
912                         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
913                 }
914         }
915
916         /*
917          * Enable HPI feature (if supported)
918          */
919         if (card->ext_csd.hpi) {
920                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
921                         EXT_CSD_HPI_MGMT, 1, 0);
922                 if (err && err != -EBADMSG)
923                         goto free_card;
924                 if (err) {
925                         pr_warning("%s: Enabling HPI failed\n",
926                                    mmc_hostname(card->host));
927                         err = 0;
928                 } else
929                         card->ext_csd.hpi_en = 1;
930         }
931
932         /*
933          * Compute bus speed.
934          */
935         max_dtr = (unsigned int)-1;
936
937         if (mmc_card_highspeed(card)) {
938                 if (max_dtr > card->ext_csd.hs_max_dtr)
939                         max_dtr = card->ext_csd.hs_max_dtr;
940         } else if (max_dtr > card->csd.max_dtr) {
941                 max_dtr = card->csd.max_dtr;
942         }
943
944         mmc_set_clock(host, max_dtr);
945
946         /*
947          * Indicate DDR mode (if supported).
948          */
949         if (mmc_card_highspeed(card)) {
950                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
951                         && ((host->caps & (MMC_CAP_1_8V_DDR |
952                              MMC_CAP_UHS_DDR50))
953                                 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
954                                 ddr = MMC_1_8V_DDR_MODE;
955                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
956                         && ((host->caps & (MMC_CAP_1_2V_DDR |
957                              MMC_CAP_UHS_DDR50))
958                                 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
959                                 ddr = MMC_1_2V_DDR_MODE;
960         }
961
962         /*
963          * Activate wide bus and DDR (if supported).
964          */
965         if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
966             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
967                 static unsigned ext_csd_bits[][2] = {
968                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
969                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
970                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
971                 };
972                 static unsigned bus_widths[] = {
973                         MMC_BUS_WIDTH_8,
974                         MMC_BUS_WIDTH_4,
975                         MMC_BUS_WIDTH_1
976                 };
977                 unsigned idx, bus_width = 0;
978
979                 if (host->caps & MMC_CAP_8_BIT_DATA)
980                         idx = 0;
981                 else
982                         idx = 1;
983                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
984                         bus_width = bus_widths[idx];
985                         if (bus_width == MMC_BUS_WIDTH_1)
986                                 ddr = 0; /* no DDR for 1-bit width */
987                         err = mmc_select_powerclass(card, ext_csd_bits[idx][0],
988                                                     ext_csd);
989                         if (err)
990                                 pr_err("%s: power class selection to "
991                                        "bus width %d failed\n",
992                                        mmc_hostname(card->host),
993                                        1 << bus_width);
994
995                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
996                                          EXT_CSD_BUS_WIDTH,
997                                          ext_csd_bits[idx][0],
998                                          card->ext_csd.generic_cmd6_time);
999                         if (!err) {
1000                                 mmc_set_bus_width(card->host, bus_width);
1001
1002                                 /*
1003                                  * If controller can't handle bus width test,
1004                                  * compare ext_csd previously read in 1 bit mode
1005                                  * against ext_csd at new bus width
1006                                  */
1007                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1008                                         err = mmc_compare_ext_csds(card,
1009                                                 bus_width);
1010                                 else
1011                                         err = mmc_bus_test(card, bus_width);
1012                                 if (!err)
1013                                         break;
1014                         }
1015                 }
1016
1017                 if (!err && ddr) {
1018                         err = mmc_select_powerclass(card, ext_csd_bits[idx][1],
1019                                                     ext_csd);
1020                         if (err)
1021                                 pr_err("%s: power class selection to "
1022                                        "bus width %d ddr %d failed\n",
1023                                        mmc_hostname(card->host),
1024                                        1 << bus_width, ddr);
1025
1026                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1027                                          EXT_CSD_BUS_WIDTH,
1028                                          ext_csd_bits[idx][1],
1029                                          card->ext_csd.generic_cmd6_time);
1030                 }
1031                 if (err) {
1032                         pr_warning("%s: switch to bus width %d ddr %d "
1033                                 "failed\n", mmc_hostname(card->host),
1034                                 1 << bus_width, ddr);
1035                         goto free_card;
1036                 } else if (ddr) {
1037                         /*
1038                          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1039                          * signaling.
1040                          *
1041                          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1042                          *
1043                          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1044                          * in the JEDEC spec for DDR.
1045                          *
1046                          * Do not force change in vccq since we are obviously
1047                          * working and no change to vccq is needed.
1048                          *
1049                          * WARNING: eMMC rules are NOT the same as SD DDR
1050                          */
1051                         if (ddr == EXT_CSD_CARD_TYPE_DDR_1_2V) {
1052                                 err = mmc_set_signal_voltage(host,
1053                                         MMC_SIGNAL_VOLTAGE_120, 0);
1054                                 if (err)
1055                                         goto err;
1056                         }
1057                         mmc_card_set_ddr_mode(card);
1058                         mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
1059                         mmc_set_bus_width(card->host, bus_width);
1060                 }
1061         }
1062
1063         /*
1064          * If cache size is higher than 0, this indicates
1065          * the existence of cache and it can be turned on.
1066          */
1067         if ((host->caps2 & MMC_CAP2_CACHE_CTRL) &&
1068                         card->ext_csd.cache_size > 0) {
1069                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1070                                 EXT_CSD_CACHE_CTRL, 1, 0);
1071                 if (err && err != -EBADMSG)
1072                         goto free_card;
1073
1074                 /*
1075                  * Only if no error, cache is turned on successfully.
1076                  */
1077                 card->ext_csd.cache_ctrl = err ? 0 : 1;
1078         }
1079
1080         if (!oldcard)
1081                 host->card = card;
1082
1083         mmc_free_ext_csd(ext_csd);
1084         return 0;
1085
1086 free_card:
1087         if (!oldcard)
1088                 mmc_remove_card(card);
1089 err:
1090         mmc_free_ext_csd(ext_csd);
1091
1092         return err;
1093 }
1094
1095 /*
1096  * Host is being removed. Free up the current card.
1097  */
1098 static void mmc_remove(struct mmc_host *host)
1099 {
1100         BUG_ON(!host);
1101         BUG_ON(!host->card);
1102
1103         mmc_remove_card(host->card);
1104         host->card = NULL;
1105 }
1106
1107 /*
1108  * Card detection callback from host.
1109  */
1110 static void mmc_detect(struct mmc_host *host)
1111 {
1112         int err;
1113
1114         BUG_ON(!host);
1115         BUG_ON(!host->card);
1116
1117         mmc_claim_host(host);
1118
1119         /*
1120          * Just check if our card has been removed.
1121          */
1122         err = mmc_send_status(host->card, NULL);
1123
1124         mmc_release_host(host);
1125
1126         if (err) {
1127                 mmc_remove(host);
1128
1129                 mmc_claim_host(host);
1130                 mmc_detach_bus(host);
1131                 mmc_power_off(host);
1132                 mmc_release_host(host);
1133         }
1134 }
1135
1136 /*
1137  * Suspend callback from host.
1138  */
1139 static int mmc_suspend(struct mmc_host *host)
1140 {
1141         int err = 0;
1142
1143         BUG_ON(!host);
1144         BUG_ON(!host->card);
1145
1146         mmc_claim_host(host);
1147         if (mmc_card_can_sleep(host))
1148                 err = mmc_card_sleep(host);
1149         else if (!mmc_host_is_spi(host))
1150                 mmc_deselect_cards(host);
1151         host->card->state &= ~MMC_STATE_HIGHSPEED;
1152         mmc_release_host(host);
1153
1154         return err;
1155 }
1156
1157 /*
1158  * Resume callback from host.
1159  *
1160  * This function tries to determine if the same card is still present
1161  * and, if so, restore all state to it.
1162  */
1163 static int mmc_resume(struct mmc_host *host)
1164 {
1165         int err;
1166
1167         BUG_ON(!host);
1168         BUG_ON(!host->card);
1169
1170         mmc_claim_host(host);
1171         err = mmc_init_card(host, host->ocr, host->card);
1172         mmc_release_host(host);
1173
1174         return err;
1175 }
1176
1177 static int mmc_power_restore(struct mmc_host *host)
1178 {
1179         int ret;
1180
1181         host->card->state &= ~MMC_STATE_HIGHSPEED;
1182         mmc_claim_host(host);
1183         ret = mmc_init_card(host, host->ocr, host->card);
1184         mmc_release_host(host);
1185
1186         return ret;
1187 }
1188
1189 static int mmc_sleep(struct mmc_host *host)
1190 {
1191         struct mmc_card *card = host->card;
1192         int err = -ENOSYS;
1193
1194         if (card && card->ext_csd.rev >= 3) {
1195                 err = mmc_card_sleepawake(host, 1);
1196                 if (err < 0)
1197                         pr_debug("%s: Error %d while putting card into sleep",
1198                                  mmc_hostname(host), err);
1199         }
1200
1201         return err;
1202 }
1203
1204 static int mmc_awake(struct mmc_host *host)
1205 {
1206         struct mmc_card *card = host->card;
1207         int err = -ENOSYS;
1208
1209         if (card && card->ext_csd.rev >= 3) {
1210                 err = mmc_card_sleepawake(host, 0);
1211                 if (err < 0)
1212                         pr_debug("%s: Error %d while awaking sleeping card",
1213                                  mmc_hostname(host), err);
1214         }
1215
1216         return err;
1217 }
1218
1219 static const struct mmc_bus_ops mmc_ops = {
1220         .awake = mmc_awake,
1221         .sleep = mmc_sleep,
1222         .remove = mmc_remove,
1223         .detect = mmc_detect,
1224         .suspend = NULL,
1225         .resume = NULL,
1226         .power_restore = mmc_power_restore,
1227 };
1228
1229 static const struct mmc_bus_ops mmc_ops_unsafe = {
1230         .awake = mmc_awake,
1231         .sleep = mmc_sleep,
1232         .remove = mmc_remove,
1233         .detect = mmc_detect,
1234         .suspend = mmc_suspend,
1235         .resume = mmc_resume,
1236         .power_restore = mmc_power_restore,
1237 };
1238
1239 static void mmc_attach_bus_ops(struct mmc_host *host)
1240 {
1241         const struct mmc_bus_ops *bus_ops;
1242
1243         if (!mmc_card_is_removable(host))
1244                 bus_ops = &mmc_ops_unsafe;
1245         else
1246                 bus_ops = &mmc_ops;
1247         mmc_attach_bus(host, bus_ops);
1248 }
1249
1250 /*
1251  * Starting point for MMC card init.
1252  */
1253 int mmc_attach_mmc(struct mmc_host *host)
1254 {
1255         int err;
1256         u32 ocr;
1257
1258         BUG_ON(!host);
1259         WARN_ON(!host->claimed);
1260
1261         /* Set correct bus mode for MMC before attempting attach */
1262         if (!mmc_host_is_spi(host))
1263                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1264
1265         err = mmc_send_op_cond(host, 0, &ocr);
1266         if (err)
1267                 return err;
1268
1269         mmc_attach_bus_ops(host);
1270         if (host->ocr_avail_mmc)
1271                 host->ocr_avail = host->ocr_avail_mmc;
1272
1273         /*
1274          * We need to get OCR a different way for SPI.
1275          */
1276         if (mmc_host_is_spi(host)) {
1277                 err = mmc_spi_read_ocr(host, 1, &ocr);
1278                 if (err)
1279                         goto err;
1280         }
1281
1282         /*
1283          * Sanity check the voltages that the card claims to
1284          * support.
1285          */
1286         if (ocr & 0x7F) {
1287                 pr_warning("%s: card claims to support voltages "
1288                        "below the defined range. These will be ignored.\n",
1289                        mmc_hostname(host));
1290                 ocr &= ~0x7F;
1291         }
1292
1293         host->ocr = mmc_select_voltage(host, ocr);
1294
1295         /*
1296          * Can we support the voltage of the card?
1297          */
1298         if (!host->ocr) {
1299                 err = -EINVAL;
1300                 goto err;
1301         }
1302
1303         /*
1304          * Detect and init the card.
1305          */
1306         err = mmc_init_card(host, host->ocr, NULL);
1307         if (err)
1308                 goto err;
1309
1310         mmc_release_host(host);
1311         err = mmc_add_card(host->card);
1312         mmc_claim_host(host);
1313         if (err)
1314                 goto remove_card;
1315
1316         return 0;
1317
1318 remove_card:
1319         mmc_release_host(host);
1320         mmc_remove_card(host->card);
1321         mmc_claim_host(host);
1322         host->card = NULL;
1323 err:
1324         mmc_detach_bus(host);
1325
1326         pr_err("%s: error %d whilst initialising MMC card\n",
1327                 mmc_hostname(host), err);
1328
1329         return err;
1330 }