mmc: core: Fixup suspend/resume issues for UHS-I cards
[~shefty/rdma-dev.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_SDR_ALL:
290         case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_1_8V:
291         case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_1_2V:
292         case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_52:
293                 card->ext_csd.hs_max_dtr = 200000000;
294                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_200;
295                 break;
296         case EXT_CSD_CARD_TYPE_SDR_1_2V_ALL:
297         case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_1_8V:
298         case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_1_2V:
299         case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_52:
300                 card->ext_csd.hs_max_dtr = 200000000;
301                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_1_2V;
302                 break;
303         case EXT_CSD_CARD_TYPE_SDR_1_8V_ALL:
304         case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_1_8V:
305         case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_1_2V:
306         case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_52:
307                 card->ext_csd.hs_max_dtr = 200000000;
308                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_1_8V;
309                 break;
310         case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
311              EXT_CSD_CARD_TYPE_26:
312                 card->ext_csd.hs_max_dtr = 52000000;
313                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
314                 break;
315         case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
316              EXT_CSD_CARD_TYPE_26:
317                 card->ext_csd.hs_max_dtr = 52000000;
318                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
319                 break;
320         case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
321              EXT_CSD_CARD_TYPE_26:
322                 card->ext_csd.hs_max_dtr = 52000000;
323                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
324                 break;
325         case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
326                 card->ext_csd.hs_max_dtr = 52000000;
327                 break;
328         case EXT_CSD_CARD_TYPE_26:
329                 card->ext_csd.hs_max_dtr = 26000000;
330                 break;
331         default:
332                 /* MMC v4 spec says this cannot happen */
333                 pr_warning("%s: card is mmc v4 but doesn't "
334                         "support any high-speed modes.\n",
335                         mmc_hostname(card->host));
336         }
337
338         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
339         card->ext_csd.raw_erase_timeout_mult =
340                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
341         card->ext_csd.raw_hc_erase_grp_size =
342                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
343         if (card->ext_csd.rev >= 3) {
344                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
345                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
346
347                 /* EXT_CSD value is in units of 10ms, but we store in ms */
348                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
349
350                 /* Sleep / awake timeout in 100ns units */
351                 if (sa_shift > 0 && sa_shift <= 0x17)
352                         card->ext_csd.sa_timeout =
353                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
354                 card->ext_csd.erase_group_def =
355                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
356                 card->ext_csd.hc_erase_timeout = 300 *
357                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
358                 card->ext_csd.hc_erase_size =
359                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
360
361                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
362
363                 /*
364                  * There are two boot regions of equal size, defined in
365                  * multiples of 128K.
366                  */
367                 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
368                         for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
369                                 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
370                                 mmc_part_add(card, part_size,
371                                         EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
372                                         "boot%d", idx, true,
373                                         MMC_BLK_DATA_AREA_BOOT);
374                         }
375                 }
376         }
377
378         card->ext_csd.raw_hc_erase_gap_size =
379                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
380         card->ext_csd.raw_sec_trim_mult =
381                 ext_csd[EXT_CSD_SEC_TRIM_MULT];
382         card->ext_csd.raw_sec_erase_mult =
383                 ext_csd[EXT_CSD_SEC_ERASE_MULT];
384         card->ext_csd.raw_sec_feature_support =
385                 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
386         card->ext_csd.raw_trim_mult =
387                 ext_csd[EXT_CSD_TRIM_MULT];
388         if (card->ext_csd.rev >= 4) {
389                 /*
390                  * Enhanced area feature support -- check whether the eMMC
391                  * card has the Enhanced area enabled.  If so, export enhanced
392                  * area offset and size to user by adding sysfs interface.
393                  */
394                 card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
395                 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
396                     (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
397                         hc_erase_grp_sz =
398                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
399                         hc_wp_grp_sz =
400                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
401
402                         card->ext_csd.enhanced_area_en = 1;
403                         /*
404                          * calculate the enhanced data area offset, in bytes
405                          */
406                         card->ext_csd.enhanced_area_offset =
407                                 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
408                                 (ext_csd[137] << 8) + ext_csd[136];
409                         if (mmc_card_blockaddr(card))
410                                 card->ext_csd.enhanced_area_offset <<= 9;
411                         /*
412                          * calculate the enhanced data area size, in kilobytes
413                          */
414                         card->ext_csd.enhanced_area_size =
415                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
416                                 ext_csd[140];
417                         card->ext_csd.enhanced_area_size *=
418                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
419                         card->ext_csd.enhanced_area_size <<= 9;
420                 } else {
421                         /*
422                          * If the enhanced area is not enabled, disable these
423                          * device attributes.
424                          */
425                         card->ext_csd.enhanced_area_offset = -EINVAL;
426                         card->ext_csd.enhanced_area_size = -EINVAL;
427                 }
428
429                 /*
430                  * General purpose partition feature support --
431                  * If ext_csd has the size of general purpose partitions,
432                  * set size, part_cfg, partition name in mmc_part.
433                  */
434                 if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
435                         EXT_CSD_PART_SUPPORT_PART_EN) {
436                         if (card->ext_csd.enhanced_area_en != 1) {
437                                 hc_erase_grp_sz =
438                                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
439                                 hc_wp_grp_sz =
440                                         ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
441
442                                 card->ext_csd.enhanced_area_en = 1;
443                         }
444
445                         for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
446                                 if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
447                                 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
448                                 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
449                                         continue;
450                                 part_size =
451                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
452                                         << 16) +
453                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
454                                         << 8) +
455                                 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
456                                 part_size *= (size_t)(hc_erase_grp_sz *
457                                         hc_wp_grp_sz);
458                                 mmc_part_add(card, part_size << 19,
459                                         EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
460                                         "gp%d", idx, false,
461                                         MMC_BLK_DATA_AREA_GP);
462                         }
463                 }
464                 card->ext_csd.sec_trim_mult =
465                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
466                 card->ext_csd.sec_erase_mult =
467                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
468                 card->ext_csd.sec_feature_support =
469                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
470                 card->ext_csd.trim_timeout = 300 *
471                         ext_csd[EXT_CSD_TRIM_MULT];
472
473                 /*
474                  * Note that the call to mmc_part_add above defaults to read
475                  * only. If this default assumption is changed, the call must
476                  * take into account the value of boot_locked below.
477                  */
478                 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
479                 card->ext_csd.boot_ro_lockable = true;
480         }
481
482         if (card->ext_csd.rev >= 5) {
483                 /* check whether the eMMC card supports HPI */
484                 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) {
485                         card->ext_csd.hpi = 1;
486                         if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
487                                 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
488                         else
489                                 card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
490                         /*
491                          * Indicate the maximum timeout to close
492                          * a command interrupted by HPI
493                          */
494                         card->ext_csd.out_of_int_time =
495                                 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
496                 }
497
498                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
499                 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
500         }
501
502         card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
503         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
504                 card->erased_byte = 0xFF;
505         else
506                 card->erased_byte = 0x0;
507
508         /* eMMC v4.5 or later */
509         if (card->ext_csd.rev >= 6) {
510                 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
511
512                 card->ext_csd.generic_cmd6_time = 10 *
513                         ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
514                 card->ext_csd.power_off_longtime = 10 *
515                         ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
516
517                 card->ext_csd.cache_size =
518                         ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
519                         ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
520                         ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
521                         ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
522         }
523
524 out:
525         return err;
526 }
527
528 static inline void mmc_free_ext_csd(u8 *ext_csd)
529 {
530         kfree(ext_csd);
531 }
532
533
534 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
535 {
536         u8 *bw_ext_csd;
537         int err;
538
539         if (bus_width == MMC_BUS_WIDTH_1)
540                 return 0;
541
542         err = mmc_get_ext_csd(card, &bw_ext_csd);
543
544         if (err || bw_ext_csd == NULL) {
545                 if (bus_width != MMC_BUS_WIDTH_1)
546                         err = -EINVAL;
547                 goto out;
548         }
549
550         if (bus_width == MMC_BUS_WIDTH_1)
551                 goto out;
552
553         /* only compare read only fields */
554         err = !((card->ext_csd.raw_partition_support ==
555                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
556                 (card->ext_csd.raw_erased_mem_count ==
557                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
558                 (card->ext_csd.rev ==
559                         bw_ext_csd[EXT_CSD_REV]) &&
560                 (card->ext_csd.raw_ext_csd_structure ==
561                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
562                 (card->ext_csd.raw_card_type ==
563                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
564                 (card->ext_csd.raw_s_a_timeout ==
565                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
566                 (card->ext_csd.raw_hc_erase_gap_size ==
567                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
568                 (card->ext_csd.raw_erase_timeout_mult ==
569                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
570                 (card->ext_csd.raw_hc_erase_grp_size ==
571                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
572                 (card->ext_csd.raw_sec_trim_mult ==
573                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
574                 (card->ext_csd.raw_sec_erase_mult ==
575                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
576                 (card->ext_csd.raw_sec_feature_support ==
577                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
578                 (card->ext_csd.raw_trim_mult ==
579                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
580                 (card->ext_csd.raw_sectors[0] ==
581                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
582                 (card->ext_csd.raw_sectors[1] ==
583                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
584                 (card->ext_csd.raw_sectors[2] ==
585                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
586                 (card->ext_csd.raw_sectors[3] ==
587                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
588         if (err)
589                 err = -EINVAL;
590
591 out:
592         mmc_free_ext_csd(bw_ext_csd);
593         return err;
594 }
595
596 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
597         card->raw_cid[2], card->raw_cid[3]);
598 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
599         card->raw_csd[2], card->raw_csd[3]);
600 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
601 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
602 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
603 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
604 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
605 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
606 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
607 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
608 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
609 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
610                 card->ext_csd.enhanced_area_offset);
611 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
612
613 static struct attribute *mmc_std_attrs[] = {
614         &dev_attr_cid.attr,
615         &dev_attr_csd.attr,
616         &dev_attr_date.attr,
617         &dev_attr_erase_size.attr,
618         &dev_attr_preferred_erase_size.attr,
619         &dev_attr_fwrev.attr,
620         &dev_attr_hwrev.attr,
621         &dev_attr_manfid.attr,
622         &dev_attr_name.attr,
623         &dev_attr_oemid.attr,
624         &dev_attr_serial.attr,
625         &dev_attr_enhanced_area_offset.attr,
626         &dev_attr_enhanced_area_size.attr,
627         NULL,
628 };
629
630 static struct attribute_group mmc_std_attr_group = {
631         .attrs = mmc_std_attrs,
632 };
633
634 static const struct attribute_group *mmc_attr_groups[] = {
635         &mmc_std_attr_group,
636         NULL,
637 };
638
639 static struct device_type mmc_type = {
640         .groups = mmc_attr_groups,
641 };
642
643 /*
644  * Select the PowerClass for the current bus width
645  * If power class is defined for 4/8 bit bus in the
646  * extended CSD register, select it by executing the
647  * mmc_switch command.
648  */
649 static int mmc_select_powerclass(struct mmc_card *card,
650                 unsigned int bus_width, u8 *ext_csd)
651 {
652         int err = 0;
653         unsigned int pwrclass_val;
654         unsigned int index = 0;
655         struct mmc_host *host;
656
657         BUG_ON(!card);
658
659         host = card->host;
660         BUG_ON(!host);
661
662         if (ext_csd == NULL)
663                 return 0;
664
665         /* Power class selection is supported for versions >= 4.0 */
666         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
667                 return 0;
668
669         /* Power class values are defined only for 4/8 bit bus */
670         if (bus_width == EXT_CSD_BUS_WIDTH_1)
671                 return 0;
672
673         switch (1 << host->ios.vdd) {
674         case MMC_VDD_165_195:
675                 if (host->ios.clock <= 26000000)
676                         index = EXT_CSD_PWR_CL_26_195;
677                 else if (host->ios.clock <= 52000000)
678                         index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
679                                 EXT_CSD_PWR_CL_52_195 :
680                                 EXT_CSD_PWR_CL_DDR_52_195;
681                 else if (host->ios.clock <= 200000000)
682                         index = EXT_CSD_PWR_CL_200_195;
683                 break;
684         case MMC_VDD_32_33:
685         case MMC_VDD_33_34:
686         case MMC_VDD_34_35:
687         case MMC_VDD_35_36:
688                 if (host->ios.clock <= 26000000)
689                         index = EXT_CSD_PWR_CL_26_360;
690                 else if (host->ios.clock <= 52000000)
691                         index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
692                                 EXT_CSD_PWR_CL_52_360 :
693                                 EXT_CSD_PWR_CL_DDR_52_360;
694                 else if (host->ios.clock <= 200000000)
695                         index = EXT_CSD_PWR_CL_200_360;
696                 break;
697         default:
698                 pr_warning("%s: Voltage range not supported "
699                            "for power class.\n", mmc_hostname(host));
700                 return -EINVAL;
701         }
702
703         pwrclass_val = ext_csd[index];
704
705         if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
706                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
707                                 EXT_CSD_PWR_CL_8BIT_SHIFT;
708         else
709                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
710                                 EXT_CSD_PWR_CL_4BIT_SHIFT;
711
712         /* If the power class is different from the default value */
713         if (pwrclass_val > 0) {
714                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
715                                  EXT_CSD_POWER_CLASS,
716                                  pwrclass_val,
717                                  card->ext_csd.generic_cmd6_time);
718         }
719
720         return err;
721 }
722
723 /*
724  * Selects the desired buswidth and switch to the HS200 mode
725  * if bus width set without error
726  */
727 static int mmc_select_hs200(struct mmc_card *card)
728 {
729         int idx, err = 0;
730         struct mmc_host *host;
731         static unsigned ext_csd_bits[] = {
732                 EXT_CSD_BUS_WIDTH_4,
733                 EXT_CSD_BUS_WIDTH_8,
734         };
735         static unsigned bus_widths[] = {
736                 MMC_BUS_WIDTH_4,
737                 MMC_BUS_WIDTH_8,
738         };
739
740         BUG_ON(!card);
741
742         host = card->host;
743
744         if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V &&
745             host->caps2 & MMC_CAP2_HS200_1_2V_SDR)
746                 if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120, 0))
747                         err = mmc_set_signal_voltage(host,
748                                                      MMC_SIGNAL_VOLTAGE_180, 0);
749
750         /* If fails try again during next card power cycle */
751         if (err)
752                 goto err;
753
754         idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 1 : 0;
755
756         /*
757          * Unlike SD, MMC cards dont have a configuration register to notify
758          * supported bus width. So bus test command should be run to identify
759          * the supported bus width or compare the ext csd values of current
760          * bus width and ext csd values of 1 bit mode read earlier.
761          */
762         for (; idx >= 0; idx--) {
763
764                 /*
765                  * Host is capable of 8bit transfer, then switch
766                  * the device to work in 8bit transfer mode. If the
767                  * mmc switch command returns error then switch to
768                  * 4bit transfer mode. On success set the corresponding
769                  * bus width on the host.
770                  */
771                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
772                                  EXT_CSD_BUS_WIDTH,
773                                  ext_csd_bits[idx],
774                                  card->ext_csd.generic_cmd6_time);
775                 if (err)
776                         continue;
777
778                 mmc_set_bus_width(card->host, bus_widths[idx]);
779
780                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
781                         err = mmc_compare_ext_csds(card, bus_widths[idx]);
782                 else
783                         err = mmc_bus_test(card, bus_widths[idx]);
784                 if (!err)
785                         break;
786         }
787
788         /* switch to HS200 mode if bus width set successfully */
789         if (!err)
790                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
791                                  EXT_CSD_HS_TIMING, 2, 0);
792 err:
793         return err;
794 }
795
796 /*
797  * Handle the detection and initialisation of a card.
798  *
799  * In the case of a resume, "oldcard" will contain the card
800  * we're trying to reinitialise.
801  */
802 static int mmc_init_card(struct mmc_host *host, u32 ocr,
803         struct mmc_card *oldcard)
804 {
805         struct mmc_card *card;
806         int err, ddr = 0;
807         u32 cid[4];
808         unsigned int max_dtr;
809         u32 rocr;
810         u8 *ext_csd = NULL;
811
812         BUG_ON(!host);
813         WARN_ON(!host->claimed);
814
815         /* Set correct bus mode for MMC before attempting init */
816         if (!mmc_host_is_spi(host))
817                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
818
819         /* Initialization should be done at 3.3 V I/O voltage. */
820         mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
821
822         /*
823          * Since we're changing the OCR value, we seem to
824          * need to tell some cards to go back to the idle
825          * state.  We wait 1ms to give cards time to
826          * respond.
827          * mmc_go_idle is needed for eMMC that are asleep
828          */
829         mmc_go_idle(host);
830
831         /* The extra bit indicates that we support high capacity */
832         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
833         if (err)
834                 goto err;
835
836         /*
837          * For SPI, enable CRC as appropriate.
838          */
839         if (mmc_host_is_spi(host)) {
840                 err = mmc_spi_set_crc(host, use_spi_crc);
841                 if (err)
842                         goto err;
843         }
844
845         /*
846          * Fetch CID from card.
847          */
848         if (mmc_host_is_spi(host))
849                 err = mmc_send_cid(host, cid);
850         else
851                 err = mmc_all_send_cid(host, cid);
852         if (err)
853                 goto err;
854
855         if (oldcard) {
856                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
857                         err = -ENOENT;
858                         goto err;
859                 }
860
861                 card = oldcard;
862         } else {
863                 /*
864                  * Allocate card structure.
865                  */
866                 card = mmc_alloc_card(host, &mmc_type);
867                 if (IS_ERR(card)) {
868                         err = PTR_ERR(card);
869                         goto err;
870                 }
871
872                 card->type = MMC_TYPE_MMC;
873                 card->rca = 1;
874                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
875         }
876
877         /*
878          * For native busses:  set card RCA and quit open drain mode.
879          */
880         if (!mmc_host_is_spi(host)) {
881                 err = mmc_set_relative_addr(card);
882                 if (err)
883                         goto free_card;
884
885                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
886         }
887
888         if (!oldcard) {
889                 /*
890                  * Fetch CSD from card.
891                  */
892                 err = mmc_send_csd(card, card->raw_csd);
893                 if (err)
894                         goto free_card;
895
896                 err = mmc_decode_csd(card);
897                 if (err)
898                         goto free_card;
899                 err = mmc_decode_cid(card);
900                 if (err)
901                         goto free_card;
902         }
903
904         /*
905          * Select card, as all following commands rely on that.
906          */
907         if (!mmc_host_is_spi(host)) {
908                 err = mmc_select_card(card);
909                 if (err)
910                         goto free_card;
911         }
912
913         if (!oldcard) {
914                 /*
915                  * Fetch and process extended CSD.
916                  */
917
918                 err = mmc_get_ext_csd(card, &ext_csd);
919                 if (err)
920                         goto free_card;
921                 err = mmc_read_ext_csd(card, ext_csd);
922                 if (err)
923                         goto free_card;
924
925                 /* If doing byte addressing, check if required to do sector
926                  * addressing.  Handle the case of <2GB cards needing sector
927                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
928                  * ocr register has bit 30 set for sector addressing.
929                  */
930                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
931                         mmc_card_set_blockaddr(card);
932
933                 /* Erase size depends on CSD and Extended CSD */
934                 mmc_set_erase_size(card);
935         }
936
937         /*
938          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
939          * bit.  This bit will be lost every time after a reset or power off.
940          */
941         if (card->ext_csd.enhanced_area_en) {
942                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
943                                  EXT_CSD_ERASE_GROUP_DEF, 1,
944                                  card->ext_csd.generic_cmd6_time);
945
946                 if (err && err != -EBADMSG)
947                         goto free_card;
948
949                 if (err) {
950                         err = 0;
951                         /*
952                          * Just disable enhanced area off & sz
953                          * will try to enable ERASE_GROUP_DEF
954                          * during next time reinit
955                          */
956                         card->ext_csd.enhanced_area_offset = -EINVAL;
957                         card->ext_csd.enhanced_area_size = -EINVAL;
958                 } else {
959                         card->ext_csd.erase_group_def = 1;
960                         /*
961                          * enable ERASE_GRP_DEF successfully.
962                          * This will affect the erase size, so
963                          * here need to reset erase size
964                          */
965                         mmc_set_erase_size(card);
966                 }
967         }
968
969         /*
970          * Ensure eMMC user default partition is enabled
971          */
972         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
973                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
974                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
975                                  card->ext_csd.part_config,
976                                  card->ext_csd.part_time);
977                 if (err && err != -EBADMSG)
978                         goto free_card;
979         }
980
981         /*
982          * If the host supports the power_off_notify capability then
983          * set the notification byte in the ext_csd register of device
984          */
985         if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) &&
986             (card->ext_csd.rev >= 6)) {
987                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
988                                  EXT_CSD_POWER_OFF_NOTIFICATION,
989                                  EXT_CSD_POWER_ON,
990                                  card->ext_csd.generic_cmd6_time);
991                 if (err && err != -EBADMSG)
992                         goto free_card;
993
994                 /*
995                  * The err can be -EBADMSG or 0,
996                  * so check for success and update the flag
997                  */
998                 if (!err)
999                         card->poweroff_notify_state = MMC_POWERED_ON;
1000         }
1001
1002         /*
1003          * Activate high speed (if supported)
1004          */
1005         if (card->ext_csd.hs_max_dtr != 0) {
1006                 err = 0;
1007                 if (card->ext_csd.hs_max_dtr > 52000000 &&
1008                     host->caps2 & MMC_CAP2_HS200)
1009                         err = mmc_select_hs200(card);
1010                 else if (host->caps & MMC_CAP_MMC_HIGHSPEED)
1011                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1012                                          EXT_CSD_HS_TIMING, 1,
1013                                          card->ext_csd.generic_cmd6_time);
1014
1015                 if (err && err != -EBADMSG)
1016                         goto free_card;
1017
1018                 if (err) {
1019                         pr_warning("%s: switch to highspeed failed\n",
1020                                mmc_hostname(card->host));
1021                         err = 0;
1022                 } else {
1023                         if (card->ext_csd.hs_max_dtr > 52000000 &&
1024                             host->caps2 & MMC_CAP2_HS200) {
1025                                 mmc_card_set_hs200(card);
1026                                 mmc_set_timing(card->host,
1027                                                MMC_TIMING_MMC_HS200);
1028                         } else {
1029                                 mmc_card_set_highspeed(card);
1030                                 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1031                         }
1032                 }
1033         }
1034
1035         /*
1036          * Enable HPI feature (if supported)
1037          */
1038         if (card->ext_csd.hpi) {
1039                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1040                         EXT_CSD_HPI_MGMT, 1, 0);
1041                 if (err && err != -EBADMSG)
1042                         goto free_card;
1043                 if (err) {
1044                         pr_warning("%s: Enabling HPI failed\n",
1045                                    mmc_hostname(card->host));
1046                         err = 0;
1047                 } else
1048                         card->ext_csd.hpi_en = 1;
1049         }
1050
1051         /*
1052          * Compute bus speed.
1053          */
1054         max_dtr = (unsigned int)-1;
1055
1056         if (mmc_card_highspeed(card) || mmc_card_hs200(card)) {
1057                 if (max_dtr > card->ext_csd.hs_max_dtr)
1058                         max_dtr = card->ext_csd.hs_max_dtr;
1059         } else if (max_dtr > card->csd.max_dtr) {
1060                 max_dtr = card->csd.max_dtr;
1061         }
1062
1063         mmc_set_clock(host, max_dtr);
1064
1065         /*
1066          * Indicate DDR mode (if supported).
1067          */
1068         if (mmc_card_highspeed(card)) {
1069                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
1070                         && ((host->caps & (MMC_CAP_1_8V_DDR |
1071                              MMC_CAP_UHS_DDR50))
1072                                 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
1073                                 ddr = MMC_1_8V_DDR_MODE;
1074                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
1075                         && ((host->caps & (MMC_CAP_1_2V_DDR |
1076                              MMC_CAP_UHS_DDR50))
1077                                 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
1078                                 ddr = MMC_1_2V_DDR_MODE;
1079         }
1080
1081         /*
1082          * Indicate HS200 SDR mode (if supported).
1083          */
1084         if (mmc_card_hs200(card)) {
1085                 u32 ext_csd_bits;
1086                 u32 bus_width = card->host->ios.bus_width;
1087
1088                 /*
1089                  * For devices supporting HS200 mode, the bus width has
1090                  * to be set before executing the tuning function. If
1091                  * set before tuning, then device will respond with CRC
1092                  * errors for responses on CMD line. So for HS200 the
1093                  * sequence will be
1094                  * 1. set bus width 4bit / 8 bit (1 bit not supported)
1095                  * 2. switch to HS200 mode
1096                  * 3. set the clock to > 52Mhz <=200MHz and
1097                  * 4. execute tuning for HS200
1098                  */
1099                 if ((host->caps2 & MMC_CAP2_HS200) &&
1100                     card->host->ops->execute_tuning)
1101                         err = card->host->ops->execute_tuning(card->host,
1102                                 MMC_SEND_TUNING_BLOCK_HS200);
1103                 if (err) {
1104                         pr_warning("%s: tuning execution failed\n",
1105                                    mmc_hostname(card->host));
1106                         goto err;
1107                 }
1108
1109                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1110                                 EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4;
1111                 err = mmc_select_powerclass(card, ext_csd_bits, ext_csd);
1112                 if (err) {
1113                         pr_err("%s: power class selection to bus width %d failed\n",
1114                                 mmc_hostname(card->host), 1 << bus_width);
1115                         goto err;
1116                 }
1117         }
1118
1119         /*
1120          * Activate wide bus and DDR (if supported).
1121          */
1122         if (!mmc_card_hs200(card) &&
1123             (card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
1124             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
1125                 static unsigned ext_csd_bits[][2] = {
1126                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
1127                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
1128                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
1129                 };
1130                 static unsigned bus_widths[] = {
1131                         MMC_BUS_WIDTH_8,
1132                         MMC_BUS_WIDTH_4,
1133                         MMC_BUS_WIDTH_1
1134                 };
1135                 unsigned idx, bus_width = 0;
1136
1137                 if (host->caps & MMC_CAP_8_BIT_DATA)
1138                         idx = 0;
1139                 else
1140                         idx = 1;
1141                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
1142                         bus_width = bus_widths[idx];
1143                         if (bus_width == MMC_BUS_WIDTH_1)
1144                                 ddr = 0; /* no DDR for 1-bit width */
1145                         err = mmc_select_powerclass(card, ext_csd_bits[idx][0],
1146                                                     ext_csd);
1147                         if (err)
1148                                 pr_err("%s: power class selection to "
1149                                        "bus width %d failed\n",
1150                                        mmc_hostname(card->host),
1151                                        1 << bus_width);
1152
1153                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1154                                          EXT_CSD_BUS_WIDTH,
1155                                          ext_csd_bits[idx][0],
1156                                          card->ext_csd.generic_cmd6_time);
1157                         if (!err) {
1158                                 mmc_set_bus_width(card->host, bus_width);
1159
1160                                 /*
1161                                  * If controller can't handle bus width test,
1162                                  * compare ext_csd previously read in 1 bit mode
1163                                  * against ext_csd at new bus width
1164                                  */
1165                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1166                                         err = mmc_compare_ext_csds(card,
1167                                                 bus_width);
1168                                 else
1169                                         err = mmc_bus_test(card, bus_width);
1170                                 if (!err)
1171                                         break;
1172                         }
1173                 }
1174
1175                 if (!err && ddr) {
1176                         err = mmc_select_powerclass(card, ext_csd_bits[idx][1],
1177                                                     ext_csd);
1178                         if (err)
1179                                 pr_err("%s: power class selection to "
1180                                        "bus width %d ddr %d failed\n",
1181                                        mmc_hostname(card->host),
1182                                        1 << bus_width, ddr);
1183
1184                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1185                                          EXT_CSD_BUS_WIDTH,
1186                                          ext_csd_bits[idx][1],
1187                                          card->ext_csd.generic_cmd6_time);
1188                 }
1189                 if (err) {
1190                         pr_warning("%s: switch to bus width %d ddr %d "
1191                                 "failed\n", mmc_hostname(card->host),
1192                                 1 << bus_width, ddr);
1193                         goto free_card;
1194                 } else if (ddr) {
1195                         /*
1196                          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1197                          * signaling.
1198                          *
1199                          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1200                          *
1201                          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1202                          * in the JEDEC spec for DDR.
1203                          *
1204                          * Do not force change in vccq since we are obviously
1205                          * working and no change to vccq is needed.
1206                          *
1207                          * WARNING: eMMC rules are NOT the same as SD DDR
1208                          */
1209                         if (ddr == MMC_1_2V_DDR_MODE) {
1210                                 err = mmc_set_signal_voltage(host,
1211                                         MMC_SIGNAL_VOLTAGE_120, 0);
1212                                 if (err)
1213                                         goto err;
1214                         }
1215                         mmc_card_set_ddr_mode(card);
1216                         mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
1217                         mmc_set_bus_width(card->host, bus_width);
1218                 }
1219         }
1220
1221         /*
1222          * If cache size is higher than 0, this indicates
1223          * the existence of cache and it can be turned on.
1224          */
1225         if ((host->caps2 & MMC_CAP2_CACHE_CTRL) &&
1226                         card->ext_csd.cache_size > 0) {
1227                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1228                                 EXT_CSD_CACHE_CTRL, 1,
1229                                 card->ext_csd.generic_cmd6_time);
1230                 if (err && err != -EBADMSG)
1231                         goto free_card;
1232
1233                 /*
1234                  * Only if no error, cache is turned on successfully.
1235                  */
1236                 if (err) {
1237                         pr_warning("%s: Cache is supported, "
1238                                         "but failed to turn on (%d)\n",
1239                                         mmc_hostname(card->host), err);
1240                         card->ext_csd.cache_ctrl = 0;
1241                         err = 0;
1242                 } else {
1243                         card->ext_csd.cache_ctrl = 1;
1244                 }
1245         }
1246
1247         if (!oldcard)
1248                 host->card = card;
1249
1250         mmc_free_ext_csd(ext_csd);
1251         return 0;
1252
1253 free_card:
1254         if (!oldcard)
1255                 mmc_remove_card(card);
1256 err:
1257         mmc_free_ext_csd(ext_csd);
1258
1259         return err;
1260 }
1261
1262 /*
1263  * Host is being removed. Free up the current card.
1264  */
1265 static void mmc_remove(struct mmc_host *host)
1266 {
1267         BUG_ON(!host);
1268         BUG_ON(!host->card);
1269
1270         mmc_remove_card(host->card);
1271         host->card = NULL;
1272 }
1273
1274 /*
1275  * Card detection - card is alive.
1276  */
1277 static int mmc_alive(struct mmc_host *host)
1278 {
1279         return mmc_send_status(host->card, NULL);
1280 }
1281
1282 /*
1283  * Card detection callback from host.
1284  */
1285 static void mmc_detect(struct mmc_host *host)
1286 {
1287         int err;
1288
1289         BUG_ON(!host);
1290         BUG_ON(!host->card);
1291
1292         mmc_claim_host(host);
1293
1294         /*
1295          * Just check if our card has been removed.
1296          */
1297         err = _mmc_detect_card_removed(host);
1298
1299         mmc_release_host(host);
1300
1301         if (err) {
1302                 mmc_remove(host);
1303
1304                 mmc_claim_host(host);
1305                 mmc_detach_bus(host);
1306                 mmc_power_off(host);
1307                 mmc_release_host(host);
1308         }
1309 }
1310
1311 /*
1312  * Suspend callback from host.
1313  */
1314 static int mmc_suspend(struct mmc_host *host)
1315 {
1316         int err = 0;
1317
1318         BUG_ON(!host);
1319         BUG_ON(!host->card);
1320
1321         mmc_claim_host(host);
1322         if (mmc_card_can_sleep(host)) {
1323                 err = mmc_card_sleep(host);
1324                 if (!err)
1325                         mmc_card_set_sleep(host->card);
1326         } else if (!mmc_host_is_spi(host))
1327                 mmc_deselect_cards(host);
1328         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1329         mmc_release_host(host);
1330
1331         return err;
1332 }
1333
1334 /*
1335  * Resume callback from host.
1336  *
1337  * This function tries to determine if the same card is still present
1338  * and, if so, restore all state to it.
1339  */
1340 static int mmc_resume(struct mmc_host *host)
1341 {
1342         int err;
1343
1344         BUG_ON(!host);
1345         BUG_ON(!host->card);
1346
1347         mmc_claim_host(host);
1348         if (mmc_card_is_sleep(host->card)) {
1349                 err = mmc_card_awake(host);
1350                 mmc_card_clr_sleep(host->card);
1351         } else
1352                 err = mmc_init_card(host, host->ocr, host->card);
1353         mmc_release_host(host);
1354
1355         return err;
1356 }
1357
1358 static int mmc_power_restore(struct mmc_host *host)
1359 {
1360         int ret;
1361
1362         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1363         mmc_card_clr_sleep(host->card);
1364         mmc_claim_host(host);
1365         ret = mmc_init_card(host, host->ocr, host->card);
1366         mmc_release_host(host);
1367
1368         return ret;
1369 }
1370
1371 static int mmc_sleep(struct mmc_host *host)
1372 {
1373         struct mmc_card *card = host->card;
1374         int err = -ENOSYS;
1375
1376         if (card && card->ext_csd.rev >= 3) {
1377                 err = mmc_card_sleepawake(host, 1);
1378                 if (err < 0)
1379                         pr_debug("%s: Error %d while putting card into sleep",
1380                                  mmc_hostname(host), err);
1381         }
1382
1383         return err;
1384 }
1385
1386 static int mmc_awake(struct mmc_host *host)
1387 {
1388         struct mmc_card *card = host->card;
1389         int err = -ENOSYS;
1390
1391         if (card && card->ext_csd.rev >= 3) {
1392                 err = mmc_card_sleepawake(host, 0);
1393                 if (err < 0)
1394                         pr_debug("%s: Error %d while awaking sleeping card",
1395                                  mmc_hostname(host), err);
1396         }
1397
1398         return err;
1399 }
1400
1401 static const struct mmc_bus_ops mmc_ops = {
1402         .awake = mmc_awake,
1403         .sleep = mmc_sleep,
1404         .remove = mmc_remove,
1405         .detect = mmc_detect,
1406         .suspend = NULL,
1407         .resume = NULL,
1408         .power_restore = mmc_power_restore,
1409         .alive = mmc_alive,
1410 };
1411
1412 static const struct mmc_bus_ops mmc_ops_unsafe = {
1413         .awake = mmc_awake,
1414         .sleep = mmc_sleep,
1415         .remove = mmc_remove,
1416         .detect = mmc_detect,
1417         .suspend = mmc_suspend,
1418         .resume = mmc_resume,
1419         .power_restore = mmc_power_restore,
1420         .alive = mmc_alive,
1421 };
1422
1423 static void mmc_attach_bus_ops(struct mmc_host *host)
1424 {
1425         const struct mmc_bus_ops *bus_ops;
1426
1427         if (!mmc_card_is_removable(host))
1428                 bus_ops = &mmc_ops_unsafe;
1429         else
1430                 bus_ops = &mmc_ops;
1431         mmc_attach_bus(host, bus_ops);
1432 }
1433
1434 /*
1435  * Starting point for MMC card init.
1436  */
1437 int mmc_attach_mmc(struct mmc_host *host)
1438 {
1439         int err;
1440         u32 ocr;
1441
1442         BUG_ON(!host);
1443         WARN_ON(!host->claimed);
1444
1445         /* Set correct bus mode for MMC before attempting attach */
1446         if (!mmc_host_is_spi(host))
1447                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1448
1449         err = mmc_send_op_cond(host, 0, &ocr);
1450         if (err)
1451                 return err;
1452
1453         mmc_attach_bus_ops(host);
1454         if (host->ocr_avail_mmc)
1455                 host->ocr_avail = host->ocr_avail_mmc;
1456
1457         /*
1458          * We need to get OCR a different way for SPI.
1459          */
1460         if (mmc_host_is_spi(host)) {
1461                 err = mmc_spi_read_ocr(host, 1, &ocr);
1462                 if (err)
1463                         goto err;
1464         }
1465
1466         /*
1467          * Sanity check the voltages that the card claims to
1468          * support.
1469          */
1470         if (ocr & 0x7F) {
1471                 pr_warning("%s: card claims to support voltages "
1472                        "below the defined range. These will be ignored.\n",
1473                        mmc_hostname(host));
1474                 ocr &= ~0x7F;
1475         }
1476
1477         host->ocr = mmc_select_voltage(host, ocr);
1478
1479         /*
1480          * Can we support the voltage of the card?
1481          */
1482         if (!host->ocr) {
1483                 err = -EINVAL;
1484                 goto err;
1485         }
1486
1487         /*
1488          * Detect and init the card.
1489          */
1490         err = mmc_init_card(host, host->ocr, NULL);
1491         if (err)
1492                 goto err;
1493
1494         mmc_release_host(host);
1495         err = mmc_add_card(host->card);
1496         mmc_claim_host(host);
1497         if (err)
1498                 goto remove_card;
1499
1500         return 0;
1501
1502 remove_card:
1503         mmc_release_host(host);
1504         mmc_remove_card(host->card);
1505         mmc_claim_host(host);
1506         host->card = NULL;
1507 err:
1508         mmc_detach_bus(host);
1509
1510         pr_err("%s: error %d whilst initialising MMC card\n",
1511                 mmc_hostname(host), err);
1512
1513         return err;
1514 }