mmc: core: Allow setting CMD timeout for CMD6 (SWITCH).
[~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
16 #include <linux/mmc/host.h>
17 #include <linux/mmc/card.h>
18 #include <linux/mmc/mmc.h>
19
20 #include "core.h"
21 #include "bus.h"
22 #include "mmc_ops.h"
23
24 static const unsigned int tran_exp[] = {
25         10000,          100000,         1000000,        10000000,
26         0,              0,              0,              0
27 };
28
29 static const unsigned char tran_mant[] = {
30         0,      10,     12,     13,     15,     20,     25,     30,
31         35,     40,     45,     50,     55,     60,     70,     80,
32 };
33
34 static const unsigned int tacc_exp[] = {
35         1,      10,     100,    1000,   10000,  100000, 1000000, 10000000,
36 };
37
38 static const unsigned int tacc_mant[] = {
39         0,      10,     12,     13,     15,     20,     25,     30,
40         35,     40,     45,     50,     55,     60,     70,     80,
41 };
42
43 #define UNSTUFF_BITS(resp,start,size)                                   \
44         ({                                                              \
45                 const int __size = size;                                \
46                 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
47                 const int __off = 3 - ((start) / 32);                   \
48                 const int __shft = (start) & 31;                        \
49                 u32 __res;                                              \
50                                                                         \
51                 __res = resp[__off] >> __shft;                          \
52                 if (__size + __shft > 32)                               \
53                         __res |= resp[__off-1] << ((32 - __shft) % 32); \
54                 __res & __mask;                                         \
55         })
56
57 /*
58  * Given the decoded CSD structure, decode the raw CID to our CID structure.
59  */
60 static int mmc_decode_cid(struct mmc_card *card)
61 {
62         u32 *resp = card->raw_cid;
63
64         /*
65          * The selection of the format here is based upon published
66          * specs from sandisk and from what people have reported.
67          */
68         switch (card->csd.mmca_vsn) {
69         case 0: /* MMC v1.0 - v1.2 */
70         case 1: /* MMC v1.4 */
71                 card->cid.manfid        = UNSTUFF_BITS(resp, 104, 24);
72                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
73                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
74                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
75                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
76                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
77                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
78                 card->cid.prod_name[6]  = UNSTUFF_BITS(resp, 48, 8);
79                 card->cid.hwrev         = UNSTUFF_BITS(resp, 44, 4);
80                 card->cid.fwrev         = UNSTUFF_BITS(resp, 40, 4);
81                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 24);
82                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
83                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
84                 break;
85
86         case 2: /* MMC v2.0 - v2.2 */
87         case 3: /* MMC v3.1 - v3.3 */
88         case 4: /* MMC v4 */
89                 card->cid.manfid        = UNSTUFF_BITS(resp, 120, 8);
90                 card->cid.oemid         = UNSTUFF_BITS(resp, 104, 16);
91                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
92                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
93                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
94                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
95                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
96                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
97                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 32);
98                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
99                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
100                 break;
101
102         default:
103                 printk(KERN_ERR "%s: card has unknown MMCA version %d\n",
104                         mmc_hostname(card->host), card->csd.mmca_vsn);
105                 return -EINVAL;
106         }
107
108         return 0;
109 }
110
111 static void mmc_set_erase_size(struct mmc_card *card)
112 {
113         if (card->ext_csd.erase_group_def & 1)
114                 card->erase_size = card->ext_csd.hc_erase_size;
115         else
116                 card->erase_size = card->csd.erase_size;
117
118         mmc_init_erase(card);
119 }
120
121 /*
122  * Given a 128-bit response, decode to our card CSD structure.
123  */
124 static int mmc_decode_csd(struct mmc_card *card)
125 {
126         struct mmc_csd *csd = &card->csd;
127         unsigned int e, m, a, b;
128         u32 *resp = card->raw_csd;
129
130         /*
131          * We only understand CSD structure v1.1 and v1.2.
132          * v1.2 has extra information in bits 15, 11 and 10.
133          * We also support eMMC v4.4 & v4.41.
134          */
135         csd->structure = UNSTUFF_BITS(resp, 126, 2);
136         if (csd->structure == 0) {
137                 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
138                         mmc_hostname(card->host), csd->structure);
139                 return -EINVAL;
140         }
141
142         csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
143         m = UNSTUFF_BITS(resp, 115, 4);
144         e = UNSTUFF_BITS(resp, 112, 3);
145         csd->tacc_ns     = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
146         csd->tacc_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
147
148         m = UNSTUFF_BITS(resp, 99, 4);
149         e = UNSTUFF_BITS(resp, 96, 3);
150         csd->max_dtr      = tran_exp[e] * tran_mant[m];
151         csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
152
153         e = UNSTUFF_BITS(resp, 47, 3);
154         m = UNSTUFF_BITS(resp, 62, 12);
155         csd->capacity     = (1 + m) << (e + 2);
156
157         csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
158         csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
159         csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
160         csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
161         csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
162         csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
163         csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
164
165         if (csd->write_blkbits >= 9) {
166                 a = UNSTUFF_BITS(resp, 42, 5);
167                 b = UNSTUFF_BITS(resp, 37, 5);
168                 csd->erase_size = (a + 1) * (b + 1);
169                 csd->erase_size <<= csd->write_blkbits - 9;
170         }
171
172         return 0;
173 }
174
175 /*
176  * Read and decode extended CSD.
177  */
178 static int mmc_read_ext_csd(struct mmc_card *card)
179 {
180         int err;
181         u8 *ext_csd;
182
183         BUG_ON(!card);
184
185         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
186                 return 0;
187
188         /*
189          * As the ext_csd is so large and mostly unused, we don't store the
190          * raw block in mmc_card.
191          */
192         ext_csd = kmalloc(512, GFP_KERNEL);
193         if (!ext_csd) {
194                 printk(KERN_ERR "%s: could not allocate a buffer to "
195                         "receive the ext_csd.\n", mmc_hostname(card->host));
196                 return -ENOMEM;
197         }
198
199         err = mmc_send_ext_csd(card, ext_csd);
200         if (err) {
201                 /* If the host or the card can't do the switch,
202                  * fail more gracefully. */
203                 if ((err != -EINVAL)
204                  && (err != -ENOSYS)
205                  && (err != -EFAULT))
206                         goto out;
207
208                 /*
209                  * High capacity cards should have this "magic" size
210                  * stored in their CSD.
211                  */
212                 if (card->csd.capacity == (4096 * 512)) {
213                         printk(KERN_ERR "%s: unable to read EXT_CSD "
214                                 "on a possible high capacity card. "
215                                 "Card will be ignored.\n",
216                                 mmc_hostname(card->host));
217                 } else {
218                         printk(KERN_WARNING "%s: unable to read "
219                                 "EXT_CSD, performance might "
220                                 "suffer.\n",
221                                 mmc_hostname(card->host));
222                         err = 0;
223                 }
224
225                 goto out;
226         }
227
228         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
229         if (card->csd.structure == 3) {
230                 int ext_csd_struct = ext_csd[EXT_CSD_STRUCTURE];
231                 if (ext_csd_struct > 2) {
232                         printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
233                                 "version %d\n", mmc_hostname(card->host),
234                                         ext_csd_struct);
235                         err = -EINVAL;
236                         goto out;
237                 }
238         }
239
240         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
241         if (card->ext_csd.rev > 5) {
242                 printk(KERN_ERR "%s: unrecognised EXT_CSD revision %d\n",
243                         mmc_hostname(card->host), card->ext_csd.rev);
244                 err = -EINVAL;
245                 goto out;
246         }
247
248         if (card->ext_csd.rev >= 2) {
249                 card->ext_csd.sectors =
250                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
251                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
252                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
253                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
254
255                 /* Cards with density > 2GiB are sector addressed */
256                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
257                         mmc_card_set_blockaddr(card);
258         }
259
260         switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
261         case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
262              EXT_CSD_CARD_TYPE_26:
263                 card->ext_csd.hs_max_dtr = 52000000;
264                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
265                 break;
266         case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
267              EXT_CSD_CARD_TYPE_26:
268                 card->ext_csd.hs_max_dtr = 52000000;
269                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
270                 break;
271         case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
272              EXT_CSD_CARD_TYPE_26:
273                 card->ext_csd.hs_max_dtr = 52000000;
274                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
275                 break;
276         case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
277                 card->ext_csd.hs_max_dtr = 52000000;
278                 break;
279         case EXT_CSD_CARD_TYPE_26:
280                 card->ext_csd.hs_max_dtr = 26000000;
281                 break;
282         default:
283                 /* MMC v4 spec says this cannot happen */
284                 printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
285                         "support any high-speed modes.\n",
286                         mmc_hostname(card->host));
287         }
288
289         if (card->ext_csd.rev >= 3) {
290                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
291                 card->ext_csd.bootconfig = ext_csd[EXT_CSD_BOOT_CONFIG];
292
293                 /* Sleep / awake timeout in 100ns units */
294                 if (sa_shift > 0 && sa_shift <= 0x17)
295                         card->ext_csd.sa_timeout =
296                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
297                 card->ext_csd.erase_group_def =
298                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
299                 card->ext_csd.hc_erase_timeout = 300 *
300                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
301                 card->ext_csd.hc_erase_size =
302                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
303
304                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
305         }
306
307         if (card->ext_csd.rev >= 4) {
308                 /*
309                  * Enhanced area feature support -- check whether the eMMC
310                  * card has the Enhanced area enabled.  If so, export enhanced
311                  * area offset and size to user by adding sysfs interface.
312                  */
313                 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
314                                 (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
315                         u8 hc_erase_grp_sz =
316                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
317                         u8 hc_wp_grp_sz =
318                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
319
320                         card->ext_csd.enhanced_area_en = 1;
321                         /*
322                          * calculate the enhanced data area offset, in bytes
323                          */
324                         card->ext_csd.enhanced_area_offset =
325                                 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
326                                 (ext_csd[137] << 8) + ext_csd[136];
327                         if (mmc_card_blockaddr(card))
328                                 card->ext_csd.enhanced_area_offset <<= 9;
329                         /*
330                          * calculate the enhanced data area size, in kilobytes
331                          */
332                         card->ext_csd.enhanced_area_size =
333                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
334                                 ext_csd[140];
335                         card->ext_csd.enhanced_area_size *=
336                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
337                         card->ext_csd.enhanced_area_size <<= 9;
338                 } else {
339                         /*
340                          * If the enhanced area is not enabled, disable these
341                          * device attributes.
342                          */
343                         card->ext_csd.enhanced_area_offset = -EINVAL;
344                         card->ext_csd.enhanced_area_size = -EINVAL;
345                 }
346                 card->ext_csd.sec_trim_mult =
347                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
348                 card->ext_csd.sec_erase_mult =
349                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
350                 card->ext_csd.sec_feature_support =
351                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
352                 card->ext_csd.trim_timeout = 300 *
353                         ext_csd[EXT_CSD_TRIM_MULT];
354         }
355
356         if (card->ext_csd.rev >= 5)
357                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
358
359         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
360                 card->erased_byte = 0xFF;
361         else
362                 card->erased_byte = 0x0;
363
364 out:
365         kfree(ext_csd);
366
367         return err;
368 }
369
370 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
371         card->raw_cid[2], card->raw_cid[3]);
372 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
373         card->raw_csd[2], card->raw_csd[3]);
374 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
375 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
376 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
377 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
378 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
379 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
380 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
381 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
382 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
383 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
384                 card->ext_csd.enhanced_area_offset);
385 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
386
387 static struct attribute *mmc_std_attrs[] = {
388         &dev_attr_cid.attr,
389         &dev_attr_csd.attr,
390         &dev_attr_date.attr,
391         &dev_attr_erase_size.attr,
392         &dev_attr_preferred_erase_size.attr,
393         &dev_attr_fwrev.attr,
394         &dev_attr_hwrev.attr,
395         &dev_attr_manfid.attr,
396         &dev_attr_name.attr,
397         &dev_attr_oemid.attr,
398         &dev_attr_serial.attr,
399         &dev_attr_enhanced_area_offset.attr,
400         &dev_attr_enhanced_area_size.attr,
401         NULL,
402 };
403
404 static struct attribute_group mmc_std_attr_group = {
405         .attrs = mmc_std_attrs,
406 };
407
408 static const struct attribute_group *mmc_attr_groups[] = {
409         &mmc_std_attr_group,
410         NULL,
411 };
412
413 static struct device_type mmc_type = {
414         .groups = mmc_attr_groups,
415 };
416
417 /*
418  * Handle the detection and initialisation of a card.
419  *
420  * In the case of a resume, "oldcard" will contain the card
421  * we're trying to reinitialise.
422  */
423 static int mmc_init_card(struct mmc_host *host, u32 ocr,
424         struct mmc_card *oldcard)
425 {
426         struct mmc_card *card;
427         int err, ddr = 0;
428         u32 cid[4];
429         unsigned int max_dtr;
430         u32 rocr;
431
432         BUG_ON(!host);
433         WARN_ON(!host->claimed);
434
435         /*
436          * Since we're changing the OCR value, we seem to
437          * need to tell some cards to go back to the idle
438          * state.  We wait 1ms to give cards time to
439          * respond.
440          */
441         mmc_go_idle(host);
442
443         /* The extra bit indicates that we support high capacity */
444         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
445         if (err)
446                 goto err;
447
448         /*
449          * For SPI, enable CRC as appropriate.
450          */
451         if (mmc_host_is_spi(host)) {
452                 err = mmc_spi_set_crc(host, use_spi_crc);
453                 if (err)
454                         goto err;
455         }
456
457         /*
458          * Fetch CID from card.
459          */
460         if (mmc_host_is_spi(host))
461                 err = mmc_send_cid(host, cid);
462         else
463                 err = mmc_all_send_cid(host, cid);
464         if (err)
465                 goto err;
466
467         if (oldcard) {
468                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
469                         err = -ENOENT;
470                         goto err;
471                 }
472
473                 card = oldcard;
474         } else {
475                 /*
476                  * Allocate card structure.
477                  */
478                 card = mmc_alloc_card(host, &mmc_type);
479                 if (IS_ERR(card)) {
480                         err = PTR_ERR(card);
481                         goto err;
482                 }
483
484                 card->type = MMC_TYPE_MMC;
485                 card->rca = 1;
486                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
487         }
488
489         /*
490          * For native busses:  set card RCA and quit open drain mode.
491          */
492         if (!mmc_host_is_spi(host)) {
493                 err = mmc_set_relative_addr(card);
494                 if (err)
495                         goto free_card;
496
497                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
498         }
499
500         if (!oldcard) {
501                 /*
502                  * Fetch CSD from card.
503                  */
504                 err = mmc_send_csd(card, card->raw_csd);
505                 if (err)
506                         goto free_card;
507
508                 err = mmc_decode_csd(card);
509                 if (err)
510                         goto free_card;
511                 err = mmc_decode_cid(card);
512                 if (err)
513                         goto free_card;
514         }
515
516         /*
517          * Select card, as all following commands rely on that.
518          */
519         if (!mmc_host_is_spi(host)) {
520                 err = mmc_select_card(card);
521                 if (err)
522                         goto free_card;
523         }
524
525         if (!oldcard) {
526                 /*
527                  * Fetch and process extended CSD.
528                  */
529                 err = mmc_read_ext_csd(card);
530                 if (err)
531                         goto free_card;
532
533                 /* If doing byte addressing, check if required to do sector
534                  * addressing.  Handle the case of <2GB cards needing sector
535                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
536                  * ocr register has bit 30 set for sector addressing.
537                  */
538                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
539                         mmc_card_set_blockaddr(card);
540
541                 /* Erase size depends on CSD and Extended CSD */
542                 mmc_set_erase_size(card);
543         }
544
545         /*
546          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
547          * bit.  This bit will be lost every time after a reset or power off.
548          */
549         if (card->ext_csd.enhanced_area_en) {
550                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
551                                  EXT_CSD_ERASE_GROUP_DEF, 1, 0);
552
553                 if (err && err != -EBADMSG)
554                         goto free_card;
555
556                 if (err) {
557                         err = 0;
558                         /*
559                          * Just disable enhanced area off & sz
560                          * will try to enable ERASE_GROUP_DEF
561                          * during next time reinit
562                          */
563                         card->ext_csd.enhanced_area_offset = -EINVAL;
564                         card->ext_csd.enhanced_area_size = -EINVAL;
565                 } else {
566                         card->ext_csd.erase_group_def = 1;
567                         /*
568                          * enable ERASE_GRP_DEF successfully.
569                          * This will affect the erase size, so
570                          * here need to reset erase size
571                          */
572                         mmc_set_erase_size(card);
573                 }
574         }
575
576         /*
577          * Ensure eMMC user default partition is enabled
578          */
579         if (card->ext_csd.bootconfig & 0x7) {
580                 card->ext_csd.bootconfig &= ~0x7;
581                 mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_CONFIG,
582                            card->ext_csd.bootconfig, 0);
583         }
584
585         /*
586          * Activate high speed (if supported)
587          */
588         if ((card->ext_csd.hs_max_dtr != 0) &&
589                 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
590                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
591                                  EXT_CSD_HS_TIMING, 1, 0);
592                 if (err && err != -EBADMSG)
593                         goto free_card;
594
595                 if (err) {
596                         printk(KERN_WARNING "%s: switch to highspeed failed\n",
597                                mmc_hostname(card->host));
598                         err = 0;
599                 } else {
600                         mmc_card_set_highspeed(card);
601                         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
602                 }
603         }
604
605         /*
606          * Compute bus speed.
607          */
608         max_dtr = (unsigned int)-1;
609
610         if (mmc_card_highspeed(card)) {
611                 if (max_dtr > card->ext_csd.hs_max_dtr)
612                         max_dtr = card->ext_csd.hs_max_dtr;
613         } else if (max_dtr > card->csd.max_dtr) {
614                 max_dtr = card->csd.max_dtr;
615         }
616
617         mmc_set_clock(host, max_dtr);
618
619         /*
620          * Indicate DDR mode (if supported).
621          */
622         if (mmc_card_highspeed(card)) {
623                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
624                         && (host->caps & (MMC_CAP_1_8V_DDR)))
625                                 ddr = MMC_1_8V_DDR_MODE;
626                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
627                         && (host->caps & (MMC_CAP_1_2V_DDR)))
628                                 ddr = MMC_1_2V_DDR_MODE;
629         }
630
631         /*
632          * Activate wide bus and DDR (if supported).
633          */
634         if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
635             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
636                 static unsigned ext_csd_bits[][2] = {
637                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
638                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
639                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
640                 };
641                 static unsigned bus_widths[] = {
642                         MMC_BUS_WIDTH_8,
643                         MMC_BUS_WIDTH_4,
644                         MMC_BUS_WIDTH_1
645                 };
646                 unsigned idx, bus_width = 0;
647
648                 if (host->caps & MMC_CAP_8_BIT_DATA)
649                         idx = 0;
650                 else
651                         idx = 1;
652                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
653                         bus_width = bus_widths[idx];
654                         if (bus_width == MMC_BUS_WIDTH_1)
655                                 ddr = 0; /* no DDR for 1-bit width */
656                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
657                                          EXT_CSD_BUS_WIDTH,
658                                          ext_csd_bits[idx][0],
659                                          0);
660                         if (!err) {
661                                 mmc_set_bus_width_ddr(card->host,
662                                                       bus_width, MMC_SDR_MODE);
663                                 /*
664                                  * If controller can't handle bus width test,
665                                  * use the highest bus width to maintain
666                                  * compatibility with previous MMC behavior.
667                                  */
668                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
669                                         break;
670                                 err = mmc_bus_test(card, bus_width);
671                                 if (!err)
672                                         break;
673                         }
674                 }
675
676                 if (!err && ddr) {
677                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
678                                          EXT_CSD_BUS_WIDTH,
679                                          ext_csd_bits[idx][1],
680                                          0);
681                 }
682                 if (err) {
683                         printk(KERN_WARNING "%s: switch to bus width %d ddr %d "
684                                 "failed\n", mmc_hostname(card->host),
685                                 1 << bus_width, ddr);
686                         goto free_card;
687                 } else if (ddr) {
688                         mmc_card_set_ddr_mode(card);
689                         mmc_set_bus_width_ddr(card->host, bus_width, ddr);
690                 }
691         }
692
693         if (!oldcard)
694                 host->card = card;
695
696         return 0;
697
698 free_card:
699         if (!oldcard)
700                 mmc_remove_card(card);
701 err:
702
703         return err;
704 }
705
706 /*
707  * Host is being removed. Free up the current card.
708  */
709 static void mmc_remove(struct mmc_host *host)
710 {
711         BUG_ON(!host);
712         BUG_ON(!host->card);
713
714         mmc_remove_card(host->card);
715         host->card = NULL;
716 }
717
718 /*
719  * Card detection callback from host.
720  */
721 static void mmc_detect(struct mmc_host *host)
722 {
723         int err;
724
725         BUG_ON(!host);
726         BUG_ON(!host->card);
727
728         mmc_claim_host(host);
729
730         /*
731          * Just check if our card has been removed.
732          */
733         err = mmc_send_status(host->card, NULL);
734
735         mmc_release_host(host);
736
737         if (err) {
738                 mmc_remove(host);
739
740                 mmc_claim_host(host);
741                 mmc_detach_bus(host);
742                 mmc_release_host(host);
743         }
744 }
745
746 /*
747  * Suspend callback from host.
748  */
749 static int mmc_suspend(struct mmc_host *host)
750 {
751         BUG_ON(!host);
752         BUG_ON(!host->card);
753
754         mmc_claim_host(host);
755         if (!mmc_host_is_spi(host))
756                 mmc_deselect_cards(host);
757         host->card->state &= ~MMC_STATE_HIGHSPEED;
758         mmc_release_host(host);
759
760         return 0;
761 }
762
763 /*
764  * Resume callback from host.
765  *
766  * This function tries to determine if the same card is still present
767  * and, if so, restore all state to it.
768  */
769 static int mmc_resume(struct mmc_host *host)
770 {
771         int err;
772
773         BUG_ON(!host);
774         BUG_ON(!host->card);
775
776         mmc_claim_host(host);
777         err = mmc_init_card(host, host->ocr, host->card);
778         mmc_release_host(host);
779
780         return err;
781 }
782
783 static int mmc_power_restore(struct mmc_host *host)
784 {
785         int ret;
786
787         host->card->state &= ~MMC_STATE_HIGHSPEED;
788         mmc_claim_host(host);
789         ret = mmc_init_card(host, host->ocr, host->card);
790         mmc_release_host(host);
791
792         return ret;
793 }
794
795 static int mmc_sleep(struct mmc_host *host)
796 {
797         struct mmc_card *card = host->card;
798         int err = -ENOSYS;
799
800         if (card && card->ext_csd.rev >= 3) {
801                 err = mmc_card_sleepawake(host, 1);
802                 if (err < 0)
803                         pr_debug("%s: Error %d while putting card into sleep",
804                                  mmc_hostname(host), err);
805         }
806
807         return err;
808 }
809
810 static int mmc_awake(struct mmc_host *host)
811 {
812         struct mmc_card *card = host->card;
813         int err = -ENOSYS;
814
815         if (card && card->ext_csd.rev >= 3) {
816                 err = mmc_card_sleepawake(host, 0);
817                 if (err < 0)
818                         pr_debug("%s: Error %d while awaking sleeping card",
819                                  mmc_hostname(host), err);
820         }
821
822         return err;
823 }
824
825 static const struct mmc_bus_ops mmc_ops = {
826         .awake = mmc_awake,
827         .sleep = mmc_sleep,
828         .remove = mmc_remove,
829         .detect = mmc_detect,
830         .suspend = NULL,
831         .resume = NULL,
832         .power_restore = mmc_power_restore,
833 };
834
835 static const struct mmc_bus_ops mmc_ops_unsafe = {
836         .awake = mmc_awake,
837         .sleep = mmc_sleep,
838         .remove = mmc_remove,
839         .detect = mmc_detect,
840         .suspend = mmc_suspend,
841         .resume = mmc_resume,
842         .power_restore = mmc_power_restore,
843 };
844
845 static void mmc_attach_bus_ops(struct mmc_host *host)
846 {
847         const struct mmc_bus_ops *bus_ops;
848
849         if (!mmc_card_is_removable(host))
850                 bus_ops = &mmc_ops_unsafe;
851         else
852                 bus_ops = &mmc_ops;
853         mmc_attach_bus(host, bus_ops);
854 }
855
856 /*
857  * Starting point for MMC card init.
858  */
859 int mmc_attach_mmc(struct mmc_host *host)
860 {
861         int err;
862         u32 ocr;
863
864         BUG_ON(!host);
865         WARN_ON(!host->claimed);
866
867         err = mmc_send_op_cond(host, 0, &ocr);
868         if (err)
869                 return err;
870
871         mmc_attach_bus_ops(host);
872         if (host->ocr_avail_mmc)
873                 host->ocr_avail = host->ocr_avail_mmc;
874
875         /*
876          * We need to get OCR a different way for SPI.
877          */
878         if (mmc_host_is_spi(host)) {
879                 err = mmc_spi_read_ocr(host, 1, &ocr);
880                 if (err)
881                         goto err;
882         }
883
884         /*
885          * Sanity check the voltages that the card claims to
886          * support.
887          */
888         if (ocr & 0x7F) {
889                 printk(KERN_WARNING "%s: card claims to support voltages "
890                        "below the defined range. These will be ignored.\n",
891                        mmc_hostname(host));
892                 ocr &= ~0x7F;
893         }
894
895         host->ocr = mmc_select_voltage(host, ocr);
896
897         /*
898          * Can we support the voltage of the card?
899          */
900         if (!host->ocr) {
901                 err = -EINVAL;
902                 goto err;
903         }
904
905         /*
906          * Detect and init the card.
907          */
908         err = mmc_init_card(host, host->ocr, NULL);
909         if (err)
910                 goto err;
911
912         mmc_release_host(host);
913         err = mmc_add_card(host->card);
914         mmc_claim_host(host);
915         if (err)
916                 goto remove_card;
917
918         return 0;
919
920 remove_card:
921         mmc_release_host(host);
922         mmc_remove_card(host->card);
923         mmc_claim_host(host);
924         host->card = NULL;
925 err:
926         mmc_detach_bus(host);
927
928         printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
929                 mmc_hostname(host), err);
930
931         return err;
932 }