a48066344fa87316997b0bcca501d0842ea7e8a1
[~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         /*
820          * Since we're changing the OCR value, we seem to
821          * need to tell some cards to go back to the idle
822          * state.  We wait 1ms to give cards time to
823          * respond.
824          * mmc_go_idle is needed for eMMC that are asleep
825          */
826         mmc_go_idle(host);
827
828         /* The extra bit indicates that we support high capacity */
829         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
830         if (err)
831                 goto err;
832
833         /*
834          * For SPI, enable CRC as appropriate.
835          */
836         if (mmc_host_is_spi(host)) {
837                 err = mmc_spi_set_crc(host, use_spi_crc);
838                 if (err)
839                         goto err;
840         }
841
842         /*
843          * Fetch CID from card.
844          */
845         if (mmc_host_is_spi(host))
846                 err = mmc_send_cid(host, cid);
847         else
848                 err = mmc_all_send_cid(host, cid);
849         if (err)
850                 goto err;
851
852         if (oldcard) {
853                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
854                         err = -ENOENT;
855                         goto err;
856                 }
857
858                 card = oldcard;
859         } else {
860                 /*
861                  * Allocate card structure.
862                  */
863                 card = mmc_alloc_card(host, &mmc_type);
864                 if (IS_ERR(card)) {
865                         err = PTR_ERR(card);
866                         goto err;
867                 }
868
869                 card->type = MMC_TYPE_MMC;
870                 card->rca = 1;
871                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
872         }
873
874         /*
875          * For native busses:  set card RCA and quit open drain mode.
876          */
877         if (!mmc_host_is_spi(host)) {
878                 err = mmc_set_relative_addr(card);
879                 if (err)
880                         goto free_card;
881
882                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
883         }
884
885         if (!oldcard) {
886                 /*
887                  * Fetch CSD from card.
888                  */
889                 err = mmc_send_csd(card, card->raw_csd);
890                 if (err)
891                         goto free_card;
892
893                 err = mmc_decode_csd(card);
894                 if (err)
895                         goto free_card;
896                 err = mmc_decode_cid(card);
897                 if (err)
898                         goto free_card;
899         }
900
901         /*
902          * Select card, as all following commands rely on that.
903          */
904         if (!mmc_host_is_spi(host)) {
905                 err = mmc_select_card(card);
906                 if (err)
907                         goto free_card;
908         }
909
910         if (!oldcard) {
911                 /*
912                  * Fetch and process extended CSD.
913                  */
914
915                 err = mmc_get_ext_csd(card, &ext_csd);
916                 if (err)
917                         goto free_card;
918                 err = mmc_read_ext_csd(card, ext_csd);
919                 if (err)
920                         goto free_card;
921
922                 /* If doing byte addressing, check if required to do sector
923                  * addressing.  Handle the case of <2GB cards needing sector
924                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
925                  * ocr register has bit 30 set for sector addressing.
926                  */
927                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
928                         mmc_card_set_blockaddr(card);
929
930                 /* Erase size depends on CSD and Extended CSD */
931                 mmc_set_erase_size(card);
932         }
933
934         /*
935          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
936          * bit.  This bit will be lost every time after a reset or power off.
937          */
938         if (card->ext_csd.enhanced_area_en) {
939                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
940                                  EXT_CSD_ERASE_GROUP_DEF, 1,
941                                  card->ext_csd.generic_cmd6_time);
942
943                 if (err && err != -EBADMSG)
944                         goto free_card;
945
946                 if (err) {
947                         err = 0;
948                         /*
949                          * Just disable enhanced area off & sz
950                          * will try to enable ERASE_GROUP_DEF
951                          * during next time reinit
952                          */
953                         card->ext_csd.enhanced_area_offset = -EINVAL;
954                         card->ext_csd.enhanced_area_size = -EINVAL;
955                 } else {
956                         card->ext_csd.erase_group_def = 1;
957                         /*
958                          * enable ERASE_GRP_DEF successfully.
959                          * This will affect the erase size, so
960                          * here need to reset erase size
961                          */
962                         mmc_set_erase_size(card);
963                 }
964         }
965
966         /*
967          * Ensure eMMC user default partition is enabled
968          */
969         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
970                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
971                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
972                                  card->ext_csd.part_config,
973                                  card->ext_csd.part_time);
974                 if (err && err != -EBADMSG)
975                         goto free_card;
976         }
977
978         /*
979          * If the host supports the power_off_notify capability then
980          * set the notification byte in the ext_csd register of device
981          */
982         if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) &&
983             (card->ext_csd.rev >= 6)) {
984                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
985                                  EXT_CSD_POWER_OFF_NOTIFICATION,
986                                  EXT_CSD_POWER_ON,
987                                  card->ext_csd.generic_cmd6_time);
988                 if (err && err != -EBADMSG)
989                         goto free_card;
990
991                 /*
992                  * The err can be -EBADMSG or 0,
993                  * so check for success and update the flag
994                  */
995                 if (!err)
996                         card->poweroff_notify_state = MMC_POWERED_ON;
997         }
998
999         /*
1000          * Activate high speed (if supported)
1001          */
1002         if (card->ext_csd.hs_max_dtr != 0) {
1003                 err = 0;
1004                 if (card->ext_csd.hs_max_dtr > 52000000 &&
1005                     host->caps2 & MMC_CAP2_HS200)
1006                         err = mmc_select_hs200(card);
1007                 else if (host->caps & MMC_CAP_MMC_HIGHSPEED)
1008                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1009                                          EXT_CSD_HS_TIMING, 1,
1010                                          card->ext_csd.generic_cmd6_time);
1011
1012                 if (err && err != -EBADMSG)
1013                         goto free_card;
1014
1015                 if (err) {
1016                         pr_warning("%s: switch to highspeed failed\n",
1017                                mmc_hostname(card->host));
1018                         err = 0;
1019                 } else {
1020                         if (card->ext_csd.hs_max_dtr > 52000000 &&
1021                             host->caps2 & MMC_CAP2_HS200) {
1022                                 mmc_card_set_hs200(card);
1023                                 mmc_set_timing(card->host,
1024                                                MMC_TIMING_MMC_HS200);
1025                         } else {
1026                                 mmc_card_set_highspeed(card);
1027                                 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1028                         }
1029                 }
1030         }
1031
1032         /*
1033          * Enable HPI feature (if supported)
1034          */
1035         if (card->ext_csd.hpi) {
1036                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1037                         EXT_CSD_HPI_MGMT, 1, 0);
1038                 if (err && err != -EBADMSG)
1039                         goto free_card;
1040                 if (err) {
1041                         pr_warning("%s: Enabling HPI failed\n",
1042                                    mmc_hostname(card->host));
1043                         err = 0;
1044                 } else
1045                         card->ext_csd.hpi_en = 1;
1046         }
1047
1048         /*
1049          * Compute bus speed.
1050          */
1051         max_dtr = (unsigned int)-1;
1052
1053         if (mmc_card_highspeed(card) || mmc_card_hs200(card)) {
1054                 if (max_dtr > card->ext_csd.hs_max_dtr)
1055                         max_dtr = card->ext_csd.hs_max_dtr;
1056         } else if (max_dtr > card->csd.max_dtr) {
1057                 max_dtr = card->csd.max_dtr;
1058         }
1059
1060         mmc_set_clock(host, max_dtr);
1061
1062         /*
1063          * Indicate DDR mode (if supported).
1064          */
1065         if (mmc_card_highspeed(card)) {
1066                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
1067                         && ((host->caps & (MMC_CAP_1_8V_DDR |
1068                              MMC_CAP_UHS_DDR50))
1069                                 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
1070                                 ddr = MMC_1_8V_DDR_MODE;
1071                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
1072                         && ((host->caps & (MMC_CAP_1_2V_DDR |
1073                              MMC_CAP_UHS_DDR50))
1074                                 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
1075                                 ddr = MMC_1_2V_DDR_MODE;
1076         }
1077
1078         /*
1079          * Indicate HS200 SDR mode (if supported).
1080          */
1081         if (mmc_card_hs200(card)) {
1082                 u32 ext_csd_bits;
1083                 u32 bus_width = card->host->ios.bus_width;
1084
1085                 /*
1086                  * For devices supporting HS200 mode, the bus width has
1087                  * to be set before executing the tuning function. If
1088                  * set before tuning, then device will respond with CRC
1089                  * errors for responses on CMD line. So for HS200 the
1090                  * sequence will be
1091                  * 1. set bus width 4bit / 8 bit (1 bit not supported)
1092                  * 2. switch to HS200 mode
1093                  * 3. set the clock to > 52Mhz <=200MHz and
1094                  * 4. execute tuning for HS200
1095                  */
1096                 if ((host->caps2 & MMC_CAP2_HS200) &&
1097                     card->host->ops->execute_tuning)
1098                         err = card->host->ops->execute_tuning(card->host,
1099                                 MMC_SEND_TUNING_BLOCK_HS200);
1100                 if (err) {
1101                         pr_warning("%s: tuning execution failed\n",
1102                                    mmc_hostname(card->host));
1103                         goto err;
1104                 }
1105
1106                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1107                                 EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4;
1108                 err = mmc_select_powerclass(card, ext_csd_bits, ext_csd);
1109                 if (err) {
1110                         pr_err("%s: power class selection to bus width %d failed\n",
1111                                 mmc_hostname(card->host), 1 << bus_width);
1112                         goto err;
1113                 }
1114         }
1115
1116         /*
1117          * Activate wide bus and DDR (if supported).
1118          */
1119         if (!mmc_card_hs200(card) &&
1120             (card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
1121             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
1122                 static unsigned ext_csd_bits[][2] = {
1123                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
1124                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
1125                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
1126                 };
1127                 static unsigned bus_widths[] = {
1128                         MMC_BUS_WIDTH_8,
1129                         MMC_BUS_WIDTH_4,
1130                         MMC_BUS_WIDTH_1
1131                 };
1132                 unsigned idx, bus_width = 0;
1133
1134                 if (host->caps & MMC_CAP_8_BIT_DATA)
1135                         idx = 0;
1136                 else
1137                         idx = 1;
1138                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
1139                         bus_width = bus_widths[idx];
1140                         if (bus_width == MMC_BUS_WIDTH_1)
1141                                 ddr = 0; /* no DDR for 1-bit width */
1142                         err = mmc_select_powerclass(card, ext_csd_bits[idx][0],
1143                                                     ext_csd);
1144                         if (err)
1145                                 pr_err("%s: power class selection to "
1146                                        "bus width %d failed\n",
1147                                        mmc_hostname(card->host),
1148                                        1 << bus_width);
1149
1150                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1151                                          EXT_CSD_BUS_WIDTH,
1152                                          ext_csd_bits[idx][0],
1153                                          card->ext_csd.generic_cmd6_time);
1154                         if (!err) {
1155                                 mmc_set_bus_width(card->host, bus_width);
1156
1157                                 /*
1158                                  * If controller can't handle bus width test,
1159                                  * compare ext_csd previously read in 1 bit mode
1160                                  * against ext_csd at new bus width
1161                                  */
1162                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1163                                         err = mmc_compare_ext_csds(card,
1164                                                 bus_width);
1165                                 else
1166                                         err = mmc_bus_test(card, bus_width);
1167                                 if (!err)
1168                                         break;
1169                         }
1170                 }
1171
1172                 if (!err && ddr) {
1173                         err = mmc_select_powerclass(card, ext_csd_bits[idx][1],
1174                                                     ext_csd);
1175                         if (err)
1176                                 pr_err("%s: power class selection to "
1177                                        "bus width %d ddr %d failed\n",
1178                                        mmc_hostname(card->host),
1179                                        1 << bus_width, ddr);
1180
1181                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1182                                          EXT_CSD_BUS_WIDTH,
1183                                          ext_csd_bits[idx][1],
1184                                          card->ext_csd.generic_cmd6_time);
1185                 }
1186                 if (err) {
1187                         pr_warning("%s: switch to bus width %d ddr %d "
1188                                 "failed\n", mmc_hostname(card->host),
1189                                 1 << bus_width, ddr);
1190                         goto free_card;
1191                 } else if (ddr) {
1192                         /*
1193                          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1194                          * signaling.
1195                          *
1196                          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1197                          *
1198                          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1199                          * in the JEDEC spec for DDR.
1200                          *
1201                          * Do not force change in vccq since we are obviously
1202                          * working and no change to vccq is needed.
1203                          *
1204                          * WARNING: eMMC rules are NOT the same as SD DDR
1205                          */
1206                         if (ddr == MMC_1_2V_DDR_MODE) {
1207                                 err = mmc_set_signal_voltage(host,
1208                                         MMC_SIGNAL_VOLTAGE_120, 0);
1209                                 if (err)
1210                                         goto err;
1211                         }
1212                         mmc_card_set_ddr_mode(card);
1213                         mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
1214                         mmc_set_bus_width(card->host, bus_width);
1215                 }
1216         }
1217
1218         /*
1219          * If cache size is higher than 0, this indicates
1220          * the existence of cache and it can be turned on.
1221          */
1222         if ((host->caps2 & MMC_CAP2_CACHE_CTRL) &&
1223                         card->ext_csd.cache_size > 0) {
1224                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1225                                 EXT_CSD_CACHE_CTRL, 1,
1226                                 card->ext_csd.generic_cmd6_time);
1227                 if (err && err != -EBADMSG)
1228                         goto free_card;
1229
1230                 /*
1231                  * Only if no error, cache is turned on successfully.
1232                  */
1233                 if (err) {
1234                         pr_warning("%s: Cache is supported, "
1235                                         "but failed to turn on (%d)\n",
1236                                         mmc_hostname(card->host), err);
1237                         card->ext_csd.cache_ctrl = 0;
1238                         err = 0;
1239                 } else {
1240                         card->ext_csd.cache_ctrl = 1;
1241                 }
1242         }
1243
1244         if (!oldcard)
1245                 host->card = card;
1246
1247         mmc_free_ext_csd(ext_csd);
1248         return 0;
1249
1250 free_card:
1251         if (!oldcard)
1252                 mmc_remove_card(card);
1253 err:
1254         mmc_free_ext_csd(ext_csd);
1255
1256         return err;
1257 }
1258
1259 /*
1260  * Host is being removed. Free up the current card.
1261  */
1262 static void mmc_remove(struct mmc_host *host)
1263 {
1264         BUG_ON(!host);
1265         BUG_ON(!host->card);
1266
1267         mmc_remove_card(host->card);
1268         host->card = NULL;
1269 }
1270
1271 /*
1272  * Card detection - card is alive.
1273  */
1274 static int mmc_alive(struct mmc_host *host)
1275 {
1276         return mmc_send_status(host->card, NULL);
1277 }
1278
1279 /*
1280  * Card detection callback from host.
1281  */
1282 static void mmc_detect(struct mmc_host *host)
1283 {
1284         int err;
1285
1286         BUG_ON(!host);
1287         BUG_ON(!host->card);
1288
1289         mmc_claim_host(host);
1290
1291         /*
1292          * Just check if our card has been removed.
1293          */
1294         err = _mmc_detect_card_removed(host);
1295
1296         mmc_release_host(host);
1297
1298         if (err) {
1299                 mmc_remove(host);
1300
1301                 mmc_claim_host(host);
1302                 mmc_detach_bus(host);
1303                 mmc_power_off(host);
1304                 mmc_release_host(host);
1305         }
1306 }
1307
1308 /*
1309  * Suspend callback from host.
1310  */
1311 static int mmc_suspend(struct mmc_host *host)
1312 {
1313         int err = 0;
1314
1315         BUG_ON(!host);
1316         BUG_ON(!host->card);
1317
1318         mmc_claim_host(host);
1319         if (mmc_card_can_sleep(host)) {
1320                 err = mmc_card_sleep(host);
1321                 if (!err)
1322                         mmc_card_set_sleep(host->card);
1323         } else if (!mmc_host_is_spi(host))
1324                 mmc_deselect_cards(host);
1325         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1326         mmc_release_host(host);
1327
1328         return err;
1329 }
1330
1331 /*
1332  * Resume callback from host.
1333  *
1334  * This function tries to determine if the same card is still present
1335  * and, if so, restore all state to it.
1336  */
1337 static int mmc_resume(struct mmc_host *host)
1338 {
1339         int err;
1340
1341         BUG_ON(!host);
1342         BUG_ON(!host->card);
1343
1344         mmc_claim_host(host);
1345         if (mmc_card_is_sleep(host->card)) {
1346                 err = mmc_card_awake(host);
1347                 mmc_card_clr_sleep(host->card);
1348         } else
1349                 err = mmc_init_card(host, host->ocr, host->card);
1350         mmc_release_host(host);
1351
1352         return err;
1353 }
1354
1355 static int mmc_power_restore(struct mmc_host *host)
1356 {
1357         int ret;
1358
1359         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1360         mmc_card_clr_sleep(host->card);
1361         mmc_claim_host(host);
1362         ret = mmc_init_card(host, host->ocr, host->card);
1363         mmc_release_host(host);
1364
1365         return ret;
1366 }
1367
1368 static int mmc_sleep(struct mmc_host *host)
1369 {
1370         struct mmc_card *card = host->card;
1371         int err = -ENOSYS;
1372
1373         if (card && card->ext_csd.rev >= 3) {
1374                 err = mmc_card_sleepawake(host, 1);
1375                 if (err < 0)
1376                         pr_debug("%s: Error %d while putting card into sleep",
1377                                  mmc_hostname(host), err);
1378         }
1379
1380         return err;
1381 }
1382
1383 static int mmc_awake(struct mmc_host *host)
1384 {
1385         struct mmc_card *card = host->card;
1386         int err = -ENOSYS;
1387
1388         if (card && card->ext_csd.rev >= 3) {
1389                 err = mmc_card_sleepawake(host, 0);
1390                 if (err < 0)
1391                         pr_debug("%s: Error %d while awaking sleeping card",
1392                                  mmc_hostname(host), err);
1393         }
1394
1395         return err;
1396 }
1397
1398 static const struct mmc_bus_ops mmc_ops = {
1399         .awake = mmc_awake,
1400         .sleep = mmc_sleep,
1401         .remove = mmc_remove,
1402         .detect = mmc_detect,
1403         .suspend = NULL,
1404         .resume = NULL,
1405         .power_restore = mmc_power_restore,
1406         .alive = mmc_alive,
1407 };
1408
1409 static const struct mmc_bus_ops mmc_ops_unsafe = {
1410         .awake = mmc_awake,
1411         .sleep = mmc_sleep,
1412         .remove = mmc_remove,
1413         .detect = mmc_detect,
1414         .suspend = mmc_suspend,
1415         .resume = mmc_resume,
1416         .power_restore = mmc_power_restore,
1417         .alive = mmc_alive,
1418 };
1419
1420 static void mmc_attach_bus_ops(struct mmc_host *host)
1421 {
1422         const struct mmc_bus_ops *bus_ops;
1423
1424         if (!mmc_card_is_removable(host))
1425                 bus_ops = &mmc_ops_unsafe;
1426         else
1427                 bus_ops = &mmc_ops;
1428         mmc_attach_bus(host, bus_ops);
1429 }
1430
1431 /*
1432  * Starting point for MMC card init.
1433  */
1434 int mmc_attach_mmc(struct mmc_host *host)
1435 {
1436         int err;
1437         u32 ocr;
1438
1439         BUG_ON(!host);
1440         WARN_ON(!host->claimed);
1441
1442         /* Set correct bus mode for MMC before attempting attach */
1443         if (!mmc_host_is_spi(host))
1444                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1445
1446         err = mmc_send_op_cond(host, 0, &ocr);
1447         if (err)
1448                 return err;
1449
1450         mmc_attach_bus_ops(host);
1451         if (host->ocr_avail_mmc)
1452                 host->ocr_avail = host->ocr_avail_mmc;
1453
1454         /*
1455          * We need to get OCR a different way for SPI.
1456          */
1457         if (mmc_host_is_spi(host)) {
1458                 err = mmc_spi_read_ocr(host, 1, &ocr);
1459                 if (err)
1460                         goto err;
1461         }
1462
1463         /*
1464          * Sanity check the voltages that the card claims to
1465          * support.
1466          */
1467         if (ocr & 0x7F) {
1468                 pr_warning("%s: card claims to support voltages "
1469                        "below the defined range. These will be ignored.\n",
1470                        mmc_hostname(host));
1471                 ocr &= ~0x7F;
1472         }
1473
1474         host->ocr = mmc_select_voltage(host, ocr);
1475
1476         /*
1477          * Can we support the voltage of the card?
1478          */
1479         if (!host->ocr) {
1480                 err = -EINVAL;
1481                 goto err;
1482         }
1483
1484         /*
1485          * Detect and init the card.
1486          */
1487         err = mmc_init_card(host, host->ocr, NULL);
1488         if (err)
1489                 goto err;
1490
1491         mmc_release_host(host);
1492         err = mmc_add_card(host->card);
1493         mmc_claim_host(host);
1494         if (err)
1495                 goto remove_card;
1496
1497         return 0;
1498
1499 remove_card:
1500         mmc_release_host(host);
1501         mmc_remove_card(host->card);
1502         mmc_claim_host(host);
1503         host->card = NULL;
1504 err:
1505         mmc_detach_bus(host);
1506
1507         pr_err("%s: error %d whilst initialising MMC card\n",
1508                 mmc_hostname(host), err);
1509
1510         return err;
1511 }