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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 static void mmc_select_card_type(struct mmc_card *card)
239 {
240         struct mmc_host *host = card->host;
241         u8 card_type = card->ext_csd.raw_card_type & EXT_CSD_CARD_TYPE_MASK;
242         u32 caps = host->caps, caps2 = host->caps2;
243         unsigned int hs_max_dtr = 0;
244
245         if (card_type & EXT_CSD_CARD_TYPE_26)
246                 hs_max_dtr = MMC_HIGH_26_MAX_DTR;
247
248         if (caps & MMC_CAP_MMC_HIGHSPEED &&
249                         card_type & EXT_CSD_CARD_TYPE_52)
250                 hs_max_dtr = MMC_HIGH_52_MAX_DTR;
251
252         if ((caps & MMC_CAP_1_8V_DDR &&
253                         card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) ||
254             (caps & MMC_CAP_1_2V_DDR &&
255                         card_type & EXT_CSD_CARD_TYPE_DDR_1_2V))
256                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
257
258         if ((caps2 & MMC_CAP2_HS200_1_8V_SDR &&
259                         card_type & EXT_CSD_CARD_TYPE_SDR_1_8V) ||
260             (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
261                         card_type & EXT_CSD_CARD_TYPE_SDR_1_2V))
262                 hs_max_dtr = MMC_HS200_MAX_DTR;
263
264         card->ext_csd.hs_max_dtr = hs_max_dtr;
265         card->ext_csd.card_type = card_type;
266 }
267
268 /*
269  * Decode extended CSD.
270  */
271 static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
272 {
273         int err = 0, idx;
274         unsigned int part_size;
275         u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0;
276
277         BUG_ON(!card);
278
279         if (!ext_csd)
280                 return 0;
281
282         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
283         card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
284         if (card->csd.structure == 3) {
285                 if (card->ext_csd.raw_ext_csd_structure > 2) {
286                         pr_err("%s: unrecognised EXT_CSD structure "
287                                 "version %d\n", mmc_hostname(card->host),
288                                         card->ext_csd.raw_ext_csd_structure);
289                         err = -EINVAL;
290                         goto out;
291                 }
292         }
293
294         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
295         if (card->ext_csd.rev > 6) {
296                 pr_err("%s: unrecognised EXT_CSD revision %d\n",
297                         mmc_hostname(card->host), card->ext_csd.rev);
298                 err = -EINVAL;
299                 goto out;
300         }
301
302         card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
303         card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
304         card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
305         card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
306         if (card->ext_csd.rev >= 2) {
307                 card->ext_csd.sectors =
308                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
309                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
310                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
311                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
312
313                 /* Cards with density > 2GiB are sector addressed */
314                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
315                         mmc_card_set_blockaddr(card);
316         }
317
318         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
319         mmc_select_card_type(card);
320
321         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
322         card->ext_csd.raw_erase_timeout_mult =
323                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
324         card->ext_csd.raw_hc_erase_grp_size =
325                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
326         if (card->ext_csd.rev >= 3) {
327                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
328                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
329
330                 /* EXT_CSD value is in units of 10ms, but we store in ms */
331                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
332
333                 /* Sleep / awake timeout in 100ns units */
334                 if (sa_shift > 0 && sa_shift <= 0x17)
335                         card->ext_csd.sa_timeout =
336                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
337                 card->ext_csd.erase_group_def =
338                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
339                 card->ext_csd.hc_erase_timeout = 300 *
340                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
341                 card->ext_csd.hc_erase_size =
342                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
343
344                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
345
346                 /*
347                  * There are two boot regions of equal size, defined in
348                  * multiples of 128K.
349                  */
350                 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
351                         for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
352                                 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
353                                 mmc_part_add(card, part_size,
354                                         EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
355                                         "boot%d", idx, true,
356                                         MMC_BLK_DATA_AREA_BOOT);
357                         }
358                 }
359         }
360
361         card->ext_csd.raw_hc_erase_gap_size =
362                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
363         card->ext_csd.raw_sec_trim_mult =
364                 ext_csd[EXT_CSD_SEC_TRIM_MULT];
365         card->ext_csd.raw_sec_erase_mult =
366                 ext_csd[EXT_CSD_SEC_ERASE_MULT];
367         card->ext_csd.raw_sec_feature_support =
368                 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
369         card->ext_csd.raw_trim_mult =
370                 ext_csd[EXT_CSD_TRIM_MULT];
371         if (card->ext_csd.rev >= 4) {
372                 /*
373                  * Enhanced area feature support -- check whether the eMMC
374                  * card has the Enhanced area enabled.  If so, export enhanced
375                  * area offset and size to user by adding sysfs interface.
376                  */
377                 card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
378                 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
379                     (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
380                         hc_erase_grp_sz =
381                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
382                         hc_wp_grp_sz =
383                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
384
385                         card->ext_csd.enhanced_area_en = 1;
386                         /*
387                          * calculate the enhanced data area offset, in bytes
388                          */
389                         card->ext_csd.enhanced_area_offset =
390                                 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
391                                 (ext_csd[137] << 8) + ext_csd[136];
392                         if (mmc_card_blockaddr(card))
393                                 card->ext_csd.enhanced_area_offset <<= 9;
394                         /*
395                          * calculate the enhanced data area size, in kilobytes
396                          */
397                         card->ext_csd.enhanced_area_size =
398                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
399                                 ext_csd[140];
400                         card->ext_csd.enhanced_area_size *=
401                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
402                         card->ext_csd.enhanced_area_size <<= 9;
403                 } else {
404                         /*
405                          * If the enhanced area is not enabled, disable these
406                          * device attributes.
407                          */
408                         card->ext_csd.enhanced_area_offset = -EINVAL;
409                         card->ext_csd.enhanced_area_size = -EINVAL;
410                 }
411
412                 /*
413                  * General purpose partition feature support --
414                  * If ext_csd has the size of general purpose partitions,
415                  * set size, part_cfg, partition name in mmc_part.
416                  */
417                 if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
418                         EXT_CSD_PART_SUPPORT_PART_EN) {
419                         if (card->ext_csd.enhanced_area_en != 1) {
420                                 hc_erase_grp_sz =
421                                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
422                                 hc_wp_grp_sz =
423                                         ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
424
425                                 card->ext_csd.enhanced_area_en = 1;
426                         }
427
428                         for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
429                                 if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
430                                 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
431                                 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
432                                         continue;
433                                 part_size =
434                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
435                                         << 16) +
436                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
437                                         << 8) +
438                                 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
439                                 part_size *= (size_t)(hc_erase_grp_sz *
440                                         hc_wp_grp_sz);
441                                 mmc_part_add(card, part_size << 19,
442                                         EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
443                                         "gp%d", idx, false,
444                                         MMC_BLK_DATA_AREA_GP);
445                         }
446                 }
447                 card->ext_csd.sec_trim_mult =
448                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
449                 card->ext_csd.sec_erase_mult =
450                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
451                 card->ext_csd.sec_feature_support =
452                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
453                 card->ext_csd.trim_timeout = 300 *
454                         ext_csd[EXT_CSD_TRIM_MULT];
455
456                 /*
457                  * Note that the call to mmc_part_add above defaults to read
458                  * only. If this default assumption is changed, the call must
459                  * take into account the value of boot_locked below.
460                  */
461                 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
462                 card->ext_csd.boot_ro_lockable = true;
463         }
464
465         if (card->ext_csd.rev >= 5) {
466                 /* check whether the eMMC card supports BKOPS */
467                 if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
468                         card->ext_csd.bkops = 1;
469                         card->ext_csd.bkops_en = ext_csd[EXT_CSD_BKOPS_EN];
470                         card->ext_csd.raw_bkops_status =
471                                 ext_csd[EXT_CSD_BKOPS_STATUS];
472                         if (!card->ext_csd.bkops_en)
473                                 pr_info("%s: BKOPS_EN bit is not set\n",
474                                         mmc_hostname(card->host));
475                 }
476
477                 /* check whether the eMMC card supports HPI */
478                 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) {
479                         card->ext_csd.hpi = 1;
480                         if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
481                                 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
482                         else
483                                 card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
484                         /*
485                          * Indicate the maximum timeout to close
486                          * a command interrupted by HPI
487                          */
488                         card->ext_csd.out_of_int_time =
489                                 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
490                 }
491
492                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
493                 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
494
495                 /*
496                  * RPMB regions are defined in multiples of 128K.
497                  */
498                 card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
499                 if (ext_csd[EXT_CSD_RPMB_MULT]) {
500                         mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
501                                 EXT_CSD_PART_CONFIG_ACC_RPMB,
502                                 "rpmb", 0, false,
503                                 MMC_BLK_DATA_AREA_RPMB);
504                 }
505         }
506
507         card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
508         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
509                 card->erased_byte = 0xFF;
510         else
511                 card->erased_byte = 0x0;
512
513         /* eMMC v4.5 or later */
514         if (card->ext_csd.rev >= 6) {
515                 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
516
517                 card->ext_csd.generic_cmd6_time = 10 *
518                         ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
519                 card->ext_csd.power_off_longtime = 10 *
520                         ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
521
522                 card->ext_csd.cache_size =
523                         ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
524                         ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
525                         ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
526                         ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
527
528                 if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
529                         card->ext_csd.data_sector_size = 4096;
530                 else
531                         card->ext_csd.data_sector_size = 512;
532
533                 if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
534                     (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
535                         card->ext_csd.data_tag_unit_size =
536                         ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
537                         (card->ext_csd.data_sector_size);
538                 } else {
539                         card->ext_csd.data_tag_unit_size = 0;
540                 }
541         } else {
542                 card->ext_csd.data_sector_size = 512;
543         }
544
545 out:
546         return err;
547 }
548
549 static inline void mmc_free_ext_csd(u8 *ext_csd)
550 {
551         kfree(ext_csd);
552 }
553
554
555 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
556 {
557         u8 *bw_ext_csd;
558         int err;
559
560         if (bus_width == MMC_BUS_WIDTH_1)
561                 return 0;
562
563         err = mmc_get_ext_csd(card, &bw_ext_csd);
564
565         if (err || bw_ext_csd == NULL) {
566                 err = -EINVAL;
567                 goto out;
568         }
569
570         /* only compare read only fields */
571         err = !((card->ext_csd.raw_partition_support ==
572                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
573                 (card->ext_csd.raw_erased_mem_count ==
574                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
575                 (card->ext_csd.rev ==
576                         bw_ext_csd[EXT_CSD_REV]) &&
577                 (card->ext_csd.raw_ext_csd_structure ==
578                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
579                 (card->ext_csd.raw_card_type ==
580                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
581                 (card->ext_csd.raw_s_a_timeout ==
582                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
583                 (card->ext_csd.raw_hc_erase_gap_size ==
584                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
585                 (card->ext_csd.raw_erase_timeout_mult ==
586                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
587                 (card->ext_csd.raw_hc_erase_grp_size ==
588                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
589                 (card->ext_csd.raw_sec_trim_mult ==
590                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
591                 (card->ext_csd.raw_sec_erase_mult ==
592                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
593                 (card->ext_csd.raw_sec_feature_support ==
594                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
595                 (card->ext_csd.raw_trim_mult ==
596                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
597                 (card->ext_csd.raw_sectors[0] ==
598                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
599                 (card->ext_csd.raw_sectors[1] ==
600                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
601                 (card->ext_csd.raw_sectors[2] ==
602                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
603                 (card->ext_csd.raw_sectors[3] ==
604                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
605         if (err)
606                 err = -EINVAL;
607
608 out:
609         mmc_free_ext_csd(bw_ext_csd);
610         return err;
611 }
612
613 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
614         card->raw_cid[2], card->raw_cid[3]);
615 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
616         card->raw_csd[2], card->raw_csd[3]);
617 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
618 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
619 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
620 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
621 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
622 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
623 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
624 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
625 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
626 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
627                 card->ext_csd.enhanced_area_offset);
628 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
629 MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
630 MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
631
632 static struct attribute *mmc_std_attrs[] = {
633         &dev_attr_cid.attr,
634         &dev_attr_csd.attr,
635         &dev_attr_date.attr,
636         &dev_attr_erase_size.attr,
637         &dev_attr_preferred_erase_size.attr,
638         &dev_attr_fwrev.attr,
639         &dev_attr_hwrev.attr,
640         &dev_attr_manfid.attr,
641         &dev_attr_name.attr,
642         &dev_attr_oemid.attr,
643         &dev_attr_serial.attr,
644         &dev_attr_enhanced_area_offset.attr,
645         &dev_attr_enhanced_area_size.attr,
646         &dev_attr_raw_rpmb_size_mult.attr,
647         &dev_attr_rel_sectors.attr,
648         NULL,
649 };
650
651 static struct attribute_group mmc_std_attr_group = {
652         .attrs = mmc_std_attrs,
653 };
654
655 static const struct attribute_group *mmc_attr_groups[] = {
656         &mmc_std_attr_group,
657         NULL,
658 };
659
660 static struct device_type mmc_type = {
661         .groups = mmc_attr_groups,
662 };
663
664 /*
665  * Select the PowerClass for the current bus width
666  * If power class is defined for 4/8 bit bus in the
667  * extended CSD register, select it by executing the
668  * mmc_switch command.
669  */
670 static int mmc_select_powerclass(struct mmc_card *card,
671                 unsigned int bus_width, u8 *ext_csd)
672 {
673         int err = 0;
674         unsigned int pwrclass_val;
675         unsigned int index = 0;
676         struct mmc_host *host;
677
678         BUG_ON(!card);
679
680         host = card->host;
681         BUG_ON(!host);
682
683         if (ext_csd == NULL)
684                 return 0;
685
686         /* Power class selection is supported for versions >= 4.0 */
687         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
688                 return 0;
689
690         /* Power class values are defined only for 4/8 bit bus */
691         if (bus_width == EXT_CSD_BUS_WIDTH_1)
692                 return 0;
693
694         switch (1 << host->ios.vdd) {
695         case MMC_VDD_165_195:
696                 if (host->ios.clock <= 26000000)
697                         index = EXT_CSD_PWR_CL_26_195;
698                 else if (host->ios.clock <= 52000000)
699                         index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
700                                 EXT_CSD_PWR_CL_52_195 :
701                                 EXT_CSD_PWR_CL_DDR_52_195;
702                 else if (host->ios.clock <= 200000000)
703                         index = EXT_CSD_PWR_CL_200_195;
704                 break;
705         case MMC_VDD_27_28:
706         case MMC_VDD_28_29:
707         case MMC_VDD_29_30:
708         case MMC_VDD_30_31:
709         case MMC_VDD_31_32:
710         case MMC_VDD_32_33:
711         case MMC_VDD_33_34:
712         case MMC_VDD_34_35:
713         case MMC_VDD_35_36:
714                 if (host->ios.clock <= 26000000)
715                         index = EXT_CSD_PWR_CL_26_360;
716                 else if (host->ios.clock <= 52000000)
717                         index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
718                                 EXT_CSD_PWR_CL_52_360 :
719                                 EXT_CSD_PWR_CL_DDR_52_360;
720                 else if (host->ios.clock <= 200000000)
721                         index = EXT_CSD_PWR_CL_200_360;
722                 break;
723         default:
724                 pr_warning("%s: Voltage range not supported "
725                            "for power class.\n", mmc_hostname(host));
726                 return -EINVAL;
727         }
728
729         pwrclass_val = ext_csd[index];
730
731         if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
732                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
733                                 EXT_CSD_PWR_CL_8BIT_SHIFT;
734         else
735                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
736                                 EXT_CSD_PWR_CL_4BIT_SHIFT;
737
738         /* If the power class is different from the default value */
739         if (pwrclass_val > 0) {
740                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
741                                  EXT_CSD_POWER_CLASS,
742                                  pwrclass_val,
743                                  card->ext_csd.generic_cmd6_time);
744         }
745
746         return err;
747 }
748
749 /*
750  * Selects the desired buswidth and switch to the HS200 mode
751  * if bus width set without error
752  */
753 static int mmc_select_hs200(struct mmc_card *card)
754 {
755         int idx, err = -EINVAL;
756         struct mmc_host *host;
757         static unsigned ext_csd_bits[] = {
758                 EXT_CSD_BUS_WIDTH_4,
759                 EXT_CSD_BUS_WIDTH_8,
760         };
761         static unsigned bus_widths[] = {
762                 MMC_BUS_WIDTH_4,
763                 MMC_BUS_WIDTH_8,
764         };
765
766         BUG_ON(!card);
767
768         host = card->host;
769
770         if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V &&
771                         host->caps2 & MMC_CAP2_HS200_1_2V_SDR)
772                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120, 0);
773
774         if (err && card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_8V &&
775                         host->caps2 & MMC_CAP2_HS200_1_8V_SDR)
776                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, 0);
777
778         /* If fails try again during next card power cycle */
779         if (err)
780                 goto err;
781
782         idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 1 : 0;
783
784         /*
785          * Unlike SD, MMC cards dont have a configuration register to notify
786          * supported bus width. So bus test command should be run to identify
787          * the supported bus width or compare the ext csd values of current
788          * bus width and ext csd values of 1 bit mode read earlier.
789          */
790         for (; idx >= 0; idx--) {
791
792                 /*
793                  * Host is capable of 8bit transfer, then switch
794                  * the device to work in 8bit transfer mode. If the
795                  * mmc switch command returns error then switch to
796                  * 4bit transfer mode. On success set the corresponding
797                  * bus width on the host.
798                  */
799                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
800                                  EXT_CSD_BUS_WIDTH,
801                                  ext_csd_bits[idx],
802                                  card->ext_csd.generic_cmd6_time);
803                 if (err)
804                         continue;
805
806                 mmc_set_bus_width(card->host, bus_widths[idx]);
807
808                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
809                         err = mmc_compare_ext_csds(card, bus_widths[idx]);
810                 else
811                         err = mmc_bus_test(card, bus_widths[idx]);
812                 if (!err)
813                         break;
814         }
815
816         /* switch to HS200 mode if bus width set successfully */
817         if (!err)
818                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
819                                  EXT_CSD_HS_TIMING, 2, 0);
820 err:
821         return err;
822 }
823
824 /*
825  * Handle the detection and initialisation of a card.
826  *
827  * In the case of a resume, "oldcard" will contain the card
828  * we're trying to reinitialise.
829  */
830 static int mmc_init_card(struct mmc_host *host, u32 ocr,
831         struct mmc_card *oldcard)
832 {
833         struct mmc_card *card;
834         int err, ddr = 0;
835         u32 cid[4];
836         unsigned int max_dtr;
837         u32 rocr;
838         u8 *ext_csd = NULL;
839
840         BUG_ON(!host);
841         WARN_ON(!host->claimed);
842
843         /* Set correct bus mode for MMC before attempting init */
844         if (!mmc_host_is_spi(host))
845                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
846
847         /*
848          * Since we're changing the OCR value, we seem to
849          * need to tell some cards to go back to the idle
850          * state.  We wait 1ms to give cards time to
851          * respond.
852          * mmc_go_idle is needed for eMMC that are asleep
853          */
854         mmc_go_idle(host);
855
856         /* The extra bit indicates that we support high capacity */
857         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
858         if (err)
859                 goto err;
860
861         /*
862          * For SPI, enable CRC as appropriate.
863          */
864         if (mmc_host_is_spi(host)) {
865                 err = mmc_spi_set_crc(host, use_spi_crc);
866                 if (err)
867                         goto err;
868         }
869
870         /*
871          * Fetch CID from card.
872          */
873         if (mmc_host_is_spi(host))
874                 err = mmc_send_cid(host, cid);
875         else
876                 err = mmc_all_send_cid(host, cid);
877         if (err)
878                 goto err;
879
880         if (oldcard) {
881                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
882                         err = -ENOENT;
883                         goto err;
884                 }
885
886                 card = oldcard;
887         } else {
888                 /*
889                  * Allocate card structure.
890                  */
891                 card = mmc_alloc_card(host, &mmc_type);
892                 if (IS_ERR(card)) {
893                         err = PTR_ERR(card);
894                         goto err;
895                 }
896
897                 card->type = MMC_TYPE_MMC;
898                 card->rca = 1;
899                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
900         }
901
902         /*
903          * For native busses:  set card RCA and quit open drain mode.
904          */
905         if (!mmc_host_is_spi(host)) {
906                 err = mmc_set_relative_addr(card);
907                 if (err)
908                         goto free_card;
909
910                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
911         }
912
913         if (!oldcard) {
914                 /*
915                  * Fetch CSD from card.
916                  */
917                 err = mmc_send_csd(card, card->raw_csd);
918                 if (err)
919                         goto free_card;
920
921                 err = mmc_decode_csd(card);
922                 if (err)
923                         goto free_card;
924                 err = mmc_decode_cid(card);
925                 if (err)
926                         goto free_card;
927         }
928
929         /*
930          * Select card, as all following commands rely on that.
931          */
932         if (!mmc_host_is_spi(host)) {
933                 err = mmc_select_card(card);
934                 if (err)
935                         goto free_card;
936         }
937
938         if (!oldcard) {
939                 /*
940                  * Fetch and process extended CSD.
941                  */
942
943                 err = mmc_get_ext_csd(card, &ext_csd);
944                 if (err)
945                         goto free_card;
946                 err = mmc_read_ext_csd(card, ext_csd);
947                 if (err)
948                         goto free_card;
949
950                 /* If doing byte addressing, check if required to do sector
951                  * addressing.  Handle the case of <2GB cards needing sector
952                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
953                  * ocr register has bit 30 set for sector addressing.
954                  */
955                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
956                         mmc_card_set_blockaddr(card);
957
958                 /* Erase size depends on CSD and Extended CSD */
959                 mmc_set_erase_size(card);
960         }
961
962         /*
963          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
964          * bit.  This bit will be lost every time after a reset or power off.
965          */
966         if (card->ext_csd.enhanced_area_en ||
967             (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
968                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
969                                  EXT_CSD_ERASE_GROUP_DEF, 1,
970                                  card->ext_csd.generic_cmd6_time);
971
972                 if (err && err != -EBADMSG)
973                         goto free_card;
974
975                 if (err) {
976                         err = 0;
977                         /*
978                          * Just disable enhanced area off & sz
979                          * will try to enable ERASE_GROUP_DEF
980                          * during next time reinit
981                          */
982                         card->ext_csd.enhanced_area_offset = -EINVAL;
983                         card->ext_csd.enhanced_area_size = -EINVAL;
984                 } else {
985                         card->ext_csd.erase_group_def = 1;
986                         /*
987                          * enable ERASE_GRP_DEF successfully.
988                          * This will affect the erase size, so
989                          * here need to reset erase size
990                          */
991                         mmc_set_erase_size(card);
992                 }
993         }
994
995         /*
996          * Ensure eMMC user default partition is enabled
997          */
998         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
999                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
1000                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
1001                                  card->ext_csd.part_config,
1002                                  card->ext_csd.part_time);
1003                 if (err && err != -EBADMSG)
1004                         goto free_card;
1005         }
1006
1007         /*
1008          * If the host supports the power_off_notify capability then
1009          * set the notification byte in the ext_csd register of device
1010          */
1011         if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) &&
1012             (card->ext_csd.rev >= 6)) {
1013                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1014                                  EXT_CSD_POWER_OFF_NOTIFICATION,
1015                                  EXT_CSD_POWER_ON,
1016                                  card->ext_csd.generic_cmd6_time);
1017                 if (err && err != -EBADMSG)
1018                         goto free_card;
1019
1020                 /*
1021                  * The err can be -EBADMSG or 0,
1022                  * so check for success and update the flag
1023                  */
1024                 if (!err)
1025                         card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
1026         }
1027
1028         /*
1029          * Activate high speed (if supported)
1030          */
1031         if (card->ext_csd.hs_max_dtr != 0) {
1032                 err = 0;
1033                 if (card->ext_csd.hs_max_dtr > 52000000 &&
1034                     host->caps2 & MMC_CAP2_HS200)
1035                         err = mmc_select_hs200(card);
1036                 else if (host->caps & MMC_CAP_MMC_HIGHSPEED)
1037                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1038                                          EXT_CSD_HS_TIMING, 1,
1039                                          card->ext_csd.generic_cmd6_time);
1040
1041                 if (err && err != -EBADMSG)
1042                         goto free_card;
1043
1044                 if (err) {
1045                         pr_warning("%s: switch to highspeed failed\n",
1046                                mmc_hostname(card->host));
1047                         err = 0;
1048                 } else {
1049                         if (card->ext_csd.hs_max_dtr > 52000000 &&
1050                             host->caps2 & MMC_CAP2_HS200) {
1051                                 mmc_card_set_hs200(card);
1052                                 mmc_set_timing(card->host,
1053                                                MMC_TIMING_MMC_HS200);
1054                         } else {
1055                                 mmc_card_set_highspeed(card);
1056                                 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1057                         }
1058                 }
1059         }
1060
1061         /*
1062          * Compute bus speed.
1063          */
1064         max_dtr = (unsigned int)-1;
1065
1066         if (mmc_card_highspeed(card) || mmc_card_hs200(card)) {
1067                 if (max_dtr > card->ext_csd.hs_max_dtr)
1068                         max_dtr = card->ext_csd.hs_max_dtr;
1069         } else if (max_dtr > card->csd.max_dtr) {
1070                 max_dtr = card->csd.max_dtr;
1071         }
1072
1073         mmc_set_clock(host, max_dtr);
1074
1075         /*
1076          * Indicate DDR mode (if supported).
1077          */
1078         if (mmc_card_highspeed(card)) {
1079                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
1080                         && ((host->caps & (MMC_CAP_1_8V_DDR |
1081                              MMC_CAP_UHS_DDR50))
1082                                 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
1083                                 ddr = MMC_1_8V_DDR_MODE;
1084                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
1085                         && ((host->caps & (MMC_CAP_1_2V_DDR |
1086                              MMC_CAP_UHS_DDR50))
1087                                 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
1088                                 ddr = MMC_1_2V_DDR_MODE;
1089         }
1090
1091         /*
1092          * Indicate HS200 SDR mode (if supported).
1093          */
1094         if (mmc_card_hs200(card)) {
1095                 u32 ext_csd_bits;
1096                 u32 bus_width = card->host->ios.bus_width;
1097
1098                 /*
1099                  * For devices supporting HS200 mode, the bus width has
1100                  * to be set before executing the tuning function. If
1101                  * set before tuning, then device will respond with CRC
1102                  * errors for responses on CMD line. So for HS200 the
1103                  * sequence will be
1104                  * 1. set bus width 4bit / 8 bit (1 bit not supported)
1105                  * 2. switch to HS200 mode
1106                  * 3. set the clock to > 52Mhz <=200MHz and
1107                  * 4. execute tuning for HS200
1108                  */
1109                 if ((host->caps2 & MMC_CAP2_HS200) &&
1110                     card->host->ops->execute_tuning) {
1111                         mmc_host_clk_hold(card->host);
1112                         err = card->host->ops->execute_tuning(card->host,
1113                                 MMC_SEND_TUNING_BLOCK_HS200);
1114                         mmc_host_clk_release(card->host);
1115                 }
1116                 if (err) {
1117                         pr_warning("%s: tuning execution failed\n",
1118                                    mmc_hostname(card->host));
1119                         goto err;
1120                 }
1121
1122                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1123                                 EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4;
1124                 err = mmc_select_powerclass(card, ext_csd_bits, ext_csd);
1125                 if (err)
1126                         pr_warning("%s: power class selection to bus width %d"
1127                                    " failed\n", mmc_hostname(card->host),
1128                                    1 << bus_width);
1129         }
1130
1131         /*
1132          * Activate wide bus and DDR (if supported).
1133          */
1134         if (!mmc_card_hs200(card) &&
1135             (card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
1136             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
1137                 static unsigned ext_csd_bits[][2] = {
1138                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
1139                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
1140                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
1141                 };
1142                 static unsigned bus_widths[] = {
1143                         MMC_BUS_WIDTH_8,
1144                         MMC_BUS_WIDTH_4,
1145                         MMC_BUS_WIDTH_1
1146                 };
1147                 unsigned idx, bus_width = 0;
1148
1149                 if (host->caps & MMC_CAP_8_BIT_DATA)
1150                         idx = 0;
1151                 else
1152                         idx = 1;
1153                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
1154                         bus_width = bus_widths[idx];
1155                         if (bus_width == MMC_BUS_WIDTH_1)
1156                                 ddr = 0; /* no DDR for 1-bit width */
1157                         err = mmc_select_powerclass(card, ext_csd_bits[idx][0],
1158                                                     ext_csd);
1159                         if (err)
1160                                 pr_warning("%s: power class selection to "
1161                                            "bus width %d failed\n",
1162                                            mmc_hostname(card->host),
1163                                            1 << bus_width);
1164
1165                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1166                                          EXT_CSD_BUS_WIDTH,
1167                                          ext_csd_bits[idx][0],
1168                                          card->ext_csd.generic_cmd6_time);
1169                         if (!err) {
1170                                 mmc_set_bus_width(card->host, bus_width);
1171
1172                                 /*
1173                                  * If controller can't handle bus width test,
1174                                  * compare ext_csd previously read in 1 bit mode
1175                                  * against ext_csd at new bus width
1176                                  */
1177                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1178                                         err = mmc_compare_ext_csds(card,
1179                                                 bus_width);
1180                                 else
1181                                         err = mmc_bus_test(card, bus_width);
1182                                 if (!err)
1183                                         break;
1184                         }
1185                 }
1186
1187                 if (!err && ddr) {
1188                         err = mmc_select_powerclass(card, ext_csd_bits[idx][1],
1189                                                     ext_csd);
1190                         if (err)
1191                                 pr_warning("%s: power class selection to "
1192                                            "bus width %d ddr %d failed\n",
1193                                            mmc_hostname(card->host),
1194                                            1 << bus_width, ddr);
1195
1196                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1197                                          EXT_CSD_BUS_WIDTH,
1198                                          ext_csd_bits[idx][1],
1199                                          card->ext_csd.generic_cmd6_time);
1200                 }
1201                 if (err) {
1202                         pr_warning("%s: switch to bus width %d ddr %d "
1203                                 "failed\n", mmc_hostname(card->host),
1204                                 1 << bus_width, ddr);
1205                         goto free_card;
1206                 } else if (ddr) {
1207                         /*
1208                          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1209                          * signaling.
1210                          *
1211                          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1212                          *
1213                          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1214                          * in the JEDEC spec for DDR.
1215                          *
1216                          * Do not force change in vccq since we are obviously
1217                          * working and no change to vccq is needed.
1218                          *
1219                          * WARNING: eMMC rules are NOT the same as SD DDR
1220                          */
1221                         if (ddr == MMC_1_2V_DDR_MODE) {
1222                                 err = mmc_set_signal_voltage(host,
1223                                         MMC_SIGNAL_VOLTAGE_120, 0);
1224                                 if (err)
1225                                         goto err;
1226                         }
1227                         mmc_card_set_ddr_mode(card);
1228                         mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
1229                         mmc_set_bus_width(card->host, bus_width);
1230                 }
1231         }
1232
1233         /*
1234          * Enable HPI feature (if supported)
1235          */
1236         if (card->ext_csd.hpi) {
1237                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1238                                 EXT_CSD_HPI_MGMT, 1,
1239                                 card->ext_csd.generic_cmd6_time);
1240                 if (err && err != -EBADMSG)
1241                         goto free_card;
1242                 if (err) {
1243                         pr_warning("%s: Enabling HPI failed\n",
1244                                    mmc_hostname(card->host));
1245                         err = 0;
1246                 } else
1247                         card->ext_csd.hpi_en = 1;
1248         }
1249
1250         /*
1251          * If cache size is higher than 0, this indicates
1252          * the existence of cache and it can be turned on.
1253          */
1254         if ((host->caps2 & MMC_CAP2_CACHE_CTRL) &&
1255                         card->ext_csd.cache_size > 0) {
1256                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1257                                 EXT_CSD_CACHE_CTRL, 1,
1258                                 card->ext_csd.generic_cmd6_time);
1259                 if (err && err != -EBADMSG)
1260                         goto free_card;
1261
1262                 /*
1263                  * Only if no error, cache is turned on successfully.
1264                  */
1265                 if (err) {
1266                         pr_warning("%s: Cache is supported, "
1267                                         "but failed to turn on (%d)\n",
1268                                         mmc_hostname(card->host), err);
1269                         card->ext_csd.cache_ctrl = 0;
1270                         err = 0;
1271                 } else {
1272                         card->ext_csd.cache_ctrl = 1;
1273                 }
1274         }
1275
1276         if (!oldcard)
1277                 host->card = card;
1278
1279         mmc_free_ext_csd(ext_csd);
1280         return 0;
1281
1282 free_card:
1283         if (!oldcard)
1284                 mmc_remove_card(card);
1285 err:
1286         mmc_free_ext_csd(ext_csd);
1287
1288         return err;
1289 }
1290
1291 static int mmc_can_poweroff_notify(const struct mmc_card *card)
1292 {
1293         return card &&
1294                 mmc_card_mmc(card) &&
1295                 (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
1296 }
1297
1298 static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
1299 {
1300         unsigned int timeout = card->ext_csd.generic_cmd6_time;
1301         int err;
1302
1303         /* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
1304         if (notify_type == EXT_CSD_POWER_OFF_LONG)
1305                 timeout = card->ext_csd.power_off_longtime;
1306
1307         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1308                          EXT_CSD_POWER_OFF_NOTIFICATION,
1309                          notify_type, timeout);
1310         if (err)
1311                 pr_err("%s: Power Off Notification timed out, %u\n",
1312                        mmc_hostname(card->host), timeout);
1313
1314         /* Disable the power off notification after the switch operation. */
1315         card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
1316
1317         return err;
1318 }
1319
1320 /*
1321  * Host is being removed. Free up the current card.
1322  */
1323 static void mmc_remove(struct mmc_host *host)
1324 {
1325         BUG_ON(!host);
1326         BUG_ON(!host->card);
1327
1328         mmc_remove_card(host->card);
1329         host->card = NULL;
1330 }
1331
1332 /*
1333  * Card detection - card is alive.
1334  */
1335 static int mmc_alive(struct mmc_host *host)
1336 {
1337         return mmc_send_status(host->card, NULL);
1338 }
1339
1340 /*
1341  * Card detection callback from host.
1342  */
1343 static void mmc_detect(struct mmc_host *host)
1344 {
1345         int err;
1346
1347         BUG_ON(!host);
1348         BUG_ON(!host->card);
1349
1350         mmc_claim_host(host);
1351
1352         /*
1353          * Just check if our card has been removed.
1354          */
1355         err = _mmc_detect_card_removed(host);
1356
1357         mmc_release_host(host);
1358
1359         if (err) {
1360                 mmc_remove(host);
1361
1362                 mmc_claim_host(host);
1363                 mmc_detach_bus(host);
1364                 mmc_power_off(host);
1365                 mmc_release_host(host);
1366         }
1367 }
1368
1369 /*
1370  * Suspend callback from host.
1371  */
1372 static int mmc_suspend(struct mmc_host *host)
1373 {
1374         int err = 0;
1375
1376         BUG_ON(!host);
1377         BUG_ON(!host->card);
1378
1379         mmc_claim_host(host);
1380         if (mmc_can_poweroff_notify(host->card))
1381                 err = mmc_poweroff_notify(host->card, EXT_CSD_POWER_OFF_SHORT);
1382         else if (mmc_card_can_sleep(host))
1383                 err = mmc_card_sleep(host);
1384         else if (!mmc_host_is_spi(host))
1385                 err = mmc_deselect_cards(host);
1386         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1387         mmc_release_host(host);
1388
1389         return err;
1390 }
1391
1392 /*
1393  * Resume callback from host.
1394  *
1395  * This function tries to determine if the same card is still present
1396  * and, if so, restore all state to it.
1397  */
1398 static int mmc_resume(struct mmc_host *host)
1399 {
1400         int err;
1401
1402         BUG_ON(!host);
1403         BUG_ON(!host->card);
1404
1405         mmc_claim_host(host);
1406         err = mmc_init_card(host, host->ocr, host->card);
1407         mmc_release_host(host);
1408
1409         return err;
1410 }
1411
1412 static int mmc_power_restore(struct mmc_host *host)
1413 {
1414         int ret;
1415
1416         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1417         mmc_claim_host(host);
1418         ret = mmc_init_card(host, host->ocr, host->card);
1419         mmc_release_host(host);
1420
1421         return ret;
1422 }
1423
1424 static int mmc_sleep(struct mmc_host *host)
1425 {
1426         struct mmc_card *card = host->card;
1427         int err = -ENOSYS;
1428
1429         if (card && card->ext_csd.rev >= 3) {
1430                 err = mmc_card_sleepawake(host, 1);
1431                 if (err < 0)
1432                         pr_debug("%s: Error %d while putting card into sleep",
1433                                  mmc_hostname(host), err);
1434         }
1435
1436         return err;
1437 }
1438
1439 static int mmc_awake(struct mmc_host *host)
1440 {
1441         struct mmc_card *card = host->card;
1442         int err = -ENOSYS;
1443
1444         if (card && card->ext_csd.rev >= 3) {
1445                 err = mmc_card_sleepawake(host, 0);
1446                 if (err < 0)
1447                         pr_debug("%s: Error %d while awaking sleeping card",
1448                                  mmc_hostname(host), err);
1449         }
1450
1451         return err;
1452 }
1453
1454 static const struct mmc_bus_ops mmc_ops = {
1455         .awake = mmc_awake,
1456         .sleep = mmc_sleep,
1457         .remove = mmc_remove,
1458         .detect = mmc_detect,
1459         .suspend = NULL,
1460         .resume = NULL,
1461         .power_restore = mmc_power_restore,
1462         .alive = mmc_alive,
1463 };
1464
1465 static const struct mmc_bus_ops mmc_ops_unsafe = {
1466         .awake = mmc_awake,
1467         .sleep = mmc_sleep,
1468         .remove = mmc_remove,
1469         .detect = mmc_detect,
1470         .suspend = mmc_suspend,
1471         .resume = mmc_resume,
1472         .power_restore = mmc_power_restore,
1473         .alive = mmc_alive,
1474 };
1475
1476 static void mmc_attach_bus_ops(struct mmc_host *host)
1477 {
1478         const struct mmc_bus_ops *bus_ops;
1479
1480         if (!mmc_card_is_removable(host))
1481                 bus_ops = &mmc_ops_unsafe;
1482         else
1483                 bus_ops = &mmc_ops;
1484         mmc_attach_bus(host, bus_ops);
1485 }
1486
1487 /*
1488  * Starting point for MMC card init.
1489  */
1490 int mmc_attach_mmc(struct mmc_host *host)
1491 {
1492         int err;
1493         u32 ocr;
1494
1495         BUG_ON(!host);
1496         WARN_ON(!host->claimed);
1497
1498         /* Set correct bus mode for MMC before attempting attach */
1499         if (!mmc_host_is_spi(host))
1500                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1501
1502         err = mmc_send_op_cond(host, 0, &ocr);
1503         if (err)
1504                 return err;
1505
1506         mmc_attach_bus_ops(host);
1507         if (host->ocr_avail_mmc)
1508                 host->ocr_avail = host->ocr_avail_mmc;
1509
1510         /*
1511          * We need to get OCR a different way for SPI.
1512          */
1513         if (mmc_host_is_spi(host)) {
1514                 err = mmc_spi_read_ocr(host, 1, &ocr);
1515                 if (err)
1516                         goto err;
1517         }
1518
1519         /*
1520          * Sanity check the voltages that the card claims to
1521          * support.
1522          */
1523         if (ocr & 0x7F) {
1524                 pr_warning("%s: card claims to support voltages "
1525                        "below the defined range. These will be ignored.\n",
1526                        mmc_hostname(host));
1527                 ocr &= ~0x7F;
1528         }
1529
1530         host->ocr = mmc_select_voltage(host, ocr);
1531
1532         /*
1533          * Can we support the voltage of the card?
1534          */
1535         if (!host->ocr) {
1536                 err = -EINVAL;
1537                 goto err;
1538         }
1539
1540         /*
1541          * Detect and init the card.
1542          */
1543         err = mmc_init_card(host, host->ocr, NULL);
1544         if (err)
1545                 goto err;
1546
1547         mmc_release_host(host);
1548         err = mmc_add_card(host->card);
1549         mmc_claim_host(host);
1550         if (err)
1551                 goto remove_card;
1552
1553         return 0;
1554
1555 remove_card:
1556         mmc_release_host(host);
1557         mmc_remove_card(host->card);
1558         mmc_claim_host(host);
1559         host->card = NULL;
1560 err:
1561         mmc_detach_bus(host);
1562
1563         pr_err("%s: error %d whilst initialising MMC card\n",
1564                 mmc_hostname(host), err);
1565
1566         return err;
1567 }