b74e6f14b3ace62198beb682f1dacd38537ab6ee
[pandora-kernel.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 #include "sd_ops.h"
24
25 static const unsigned int tran_exp[] = {
26         10000,          100000,         1000000,        10000000,
27         0,              0,              0,              0
28 };
29
30 static const unsigned char tran_mant[] = {
31         0,      10,     12,     13,     15,     20,     25,     30,
32         35,     40,     45,     50,     55,     60,     70,     80,
33 };
34
35 static const unsigned int tacc_exp[] = {
36         1,      10,     100,    1000,   10000,  100000, 1000000, 10000000,
37 };
38
39 static const unsigned int tacc_mant[] = {
40         0,      10,     12,     13,     15,     20,     25,     30,
41         35,     40,     45,     50,     55,     60,     70,     80,
42 };
43
44 #define UNSTUFF_BITS(resp,start,size)                                   \
45         ({                                                              \
46                 const int __size = size;                                \
47                 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
48                 const int __off = 3 - ((start) / 32);                   \
49                 const int __shft = (start) & 31;                        \
50                 u32 __res;                                              \
51                                                                         \
52                 __res = resp[__off] >> __shft;                          \
53                 if (__size + __shft > 32)                               \
54                         __res |= resp[__off-1] << ((32 - __shft) % 32); \
55                 __res & __mask;                                         \
56         })
57
58 /*
59  * Given the decoded CSD structure, decode the raw CID to our CID structure.
60  */
61 static int mmc_decode_cid(struct mmc_card *card)
62 {
63         u32 *resp = card->raw_cid;
64
65         /*
66          * The selection of the format here is based upon published
67          * specs from sandisk and from what people have reported.
68          */
69         switch (card->csd.mmca_vsn) {
70         case 0: /* MMC v1.0 - v1.2 */
71         case 1: /* MMC v1.4 */
72                 card->cid.manfid        = UNSTUFF_BITS(resp, 104, 24);
73                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
74                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
75                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
76                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
77                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
78                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
79                 card->cid.prod_name[6]  = UNSTUFF_BITS(resp, 48, 8);
80                 card->cid.hwrev         = UNSTUFF_BITS(resp, 44, 4);
81                 card->cid.fwrev         = UNSTUFF_BITS(resp, 40, 4);
82                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 24);
83                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
84                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
85                 break;
86
87         case 2: /* MMC v2.0 - v2.2 */
88         case 3: /* MMC v3.1 - v3.3 */
89         case 4: /* MMC v4 */
90                 card->cid.manfid        = UNSTUFF_BITS(resp, 120, 8);
91                 card->cid.oemid         = UNSTUFF_BITS(resp, 104, 16);
92                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
93                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
94                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
95                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
96                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
97                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
98                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 32);
99                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
100                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
101                 break;
102
103         default:
104                 printk(KERN_ERR "%s: card has unknown MMCA version %d\n",
105                         mmc_hostname(card->host), card->csd.mmca_vsn);
106                 return -EINVAL;
107         }
108
109         return 0;
110 }
111
112 static void mmc_set_erase_size(struct mmc_card *card)
113 {
114         if (card->ext_csd.erase_group_def & 1)
115                 card->erase_size = card->ext_csd.hc_erase_size;
116         else
117                 card->erase_size = card->csd.erase_size;
118
119         mmc_init_erase(card);
120 }
121
122 /*
123  * Given a 128-bit response, decode to our card CSD structure.
124  */
125 static int mmc_decode_csd(struct mmc_card *card)
126 {
127         struct mmc_csd *csd = &card->csd;
128         unsigned int e, m, a, b;
129         u32 *resp = card->raw_csd;
130
131         /*
132          * We only understand CSD structure v1.1 and v1.2.
133          * v1.2 has extra information in bits 15, 11 and 10.
134          * We also support eMMC v4.4 & v4.41.
135          */
136         csd->structure = UNSTUFF_BITS(resp, 126, 2);
137         if (csd->structure == 0) {
138                 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
139                         mmc_hostname(card->host), csd->structure);
140                 return -EINVAL;
141         }
142
143         csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
144         m = UNSTUFF_BITS(resp, 115, 4);
145         e = UNSTUFF_BITS(resp, 112, 3);
146         csd->tacc_ns     = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
147         csd->tacc_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
148
149         m = UNSTUFF_BITS(resp, 99, 4);
150         e = UNSTUFF_BITS(resp, 96, 3);
151         csd->max_dtr      = tran_exp[e] * tran_mant[m];
152         csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
153
154         e = UNSTUFF_BITS(resp, 47, 3);
155         m = UNSTUFF_BITS(resp, 62, 12);
156         csd->capacity     = (1 + m) << (e + 2);
157
158         csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
159         csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
160         csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
161         csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
162         csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
163         csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
164         csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
165
166         if (csd->write_blkbits >= 9) {
167                 a = UNSTUFF_BITS(resp, 42, 5);
168                 b = UNSTUFF_BITS(resp, 37, 5);
169                 csd->erase_size = (a + 1) * (b + 1);
170                 csd->erase_size <<= csd->write_blkbits - 9;
171         }
172
173         return 0;
174 }
175
176 /*
177  * Read extended CSD.
178  */
179 static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
180 {
181         int err;
182         u8 *ext_csd;
183
184         BUG_ON(!card);
185         BUG_ON(!new_ext_csd);
186
187         *new_ext_csd = NULL;
188
189         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
190                 return 0;
191
192         /*
193          * As the ext_csd is so large and mostly unused, we don't store the
194          * raw block in mmc_card.
195          */
196         ext_csd = kmalloc(512, GFP_KERNEL);
197         if (!ext_csd) {
198                 printk(KERN_ERR "%s: could not allocate a buffer to "
199                         "receive the ext_csd.\n", mmc_hostname(card->host));
200                 return -ENOMEM;
201         }
202
203         err = mmc_send_ext_csd(card, ext_csd);
204         if (err) {
205                 kfree(ext_csd);
206                 *new_ext_csd = NULL;
207
208                 /* If the host or the card can't do the switch,
209                  * fail more gracefully. */
210                 if ((err != -EINVAL)
211                  && (err != -ENOSYS)
212                  && (err != -EFAULT))
213                         return err;
214
215                 /*
216                  * High capacity cards should have this "magic" size
217                  * stored in their CSD.
218                  */
219                 if (card->csd.capacity == (4096 * 512)) {
220                         printk(KERN_ERR "%s: unable to read EXT_CSD "
221                                 "on a possible high capacity card. "
222                                 "Card will be ignored.\n",
223                                 mmc_hostname(card->host));
224                 } else {
225                         printk(KERN_WARNING "%s: unable to read "
226                                 "EXT_CSD, performance might "
227                                 "suffer.\n",
228                                 mmc_hostname(card->host));
229                         err = 0;
230                 }
231         } else
232                 *new_ext_csd = ext_csd;
233
234         return err;
235 }
236
237 /*
238  * Decode extended CSD.
239  */
240 static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
241 {
242         int err = 0;
243
244         BUG_ON(!card);
245
246         if (!ext_csd)
247                 return 0;
248
249         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
250         card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
251         if (card->csd.structure == 3) {
252                 if (card->ext_csd.raw_ext_csd_structure > 2) {
253                         printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
254                                 "version %d\n", mmc_hostname(card->host),
255                                         card->ext_csd.raw_ext_csd_structure);
256                         err = -EINVAL;
257                         goto out;
258                 }
259         }
260
261         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
262         if (card->ext_csd.rev > 6) {
263                 printk(KERN_ERR "%s: unrecognised EXT_CSD revision %d\n",
264                         mmc_hostname(card->host), card->ext_csd.rev);
265                 err = -EINVAL;
266                 goto out;
267         }
268
269         card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
270         card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
271         card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
272         card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
273         if (card->ext_csd.rev >= 2) {
274                 card->ext_csd.sectors =
275                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
276                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
277                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
278                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
279
280                 /* Cards with density > 2GiB are sector addressed */
281                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
282                         mmc_card_set_blockaddr(card);
283         }
284         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
285         switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
286         case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
287              EXT_CSD_CARD_TYPE_26:
288                 card->ext_csd.hs_max_dtr = 52000000;
289                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
290                 break;
291         case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
292              EXT_CSD_CARD_TYPE_26:
293                 card->ext_csd.hs_max_dtr = 52000000;
294                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
295                 break;
296         case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
297              EXT_CSD_CARD_TYPE_26:
298                 card->ext_csd.hs_max_dtr = 52000000;
299                 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
300                 break;
301         case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
302                 card->ext_csd.hs_max_dtr = 52000000;
303                 break;
304         case EXT_CSD_CARD_TYPE_26:
305                 card->ext_csd.hs_max_dtr = 26000000;
306                 break;
307         default:
308                 /* MMC v4 spec says this cannot happen */
309                 printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
310                         "support any high-speed modes.\n",
311                         mmc_hostname(card->host));
312         }
313
314         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
315         card->ext_csd.raw_erase_timeout_mult =
316                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
317         card->ext_csd.raw_hc_erase_grp_size =
318                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
319         if (card->ext_csd.rev >= 3) {
320                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
321                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
322
323                 /* EXT_CSD value is in units of 10ms, but we store in ms */
324                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
325
326                 /* Sleep / awake timeout in 100ns units */
327                 if (sa_shift > 0 && sa_shift <= 0x17)
328                         card->ext_csd.sa_timeout =
329                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
330                 card->ext_csd.erase_group_def =
331                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
332                 card->ext_csd.hc_erase_timeout = 300 *
333                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
334                 card->ext_csd.hc_erase_size =
335                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
336
337                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
338
339                 /*
340                  * There are two boot regions of equal size, defined in
341                  * multiples of 128K.
342                  */
343                 card->ext_csd.boot_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
344         }
345
346         card->ext_csd.raw_hc_erase_gap_size =
347                 ext_csd[EXT_CSD_PARTITION_ATTRIBUTE];
348         card->ext_csd.raw_sec_trim_mult =
349                 ext_csd[EXT_CSD_SEC_TRIM_MULT];
350         card->ext_csd.raw_sec_erase_mult =
351                 ext_csd[EXT_CSD_SEC_ERASE_MULT];
352         card->ext_csd.raw_sec_feature_support =
353                 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
354         card->ext_csd.raw_trim_mult =
355                 ext_csd[EXT_CSD_TRIM_MULT];
356         if (card->ext_csd.rev >= 4) {
357                 /*
358                  * Enhanced area feature support -- check whether the eMMC
359                  * card has the Enhanced area enabled.  If so, export enhanced
360                  * area offset and size to user by adding sysfs interface.
361                  */
362                 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
363                     (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
364                         u8 hc_erase_grp_sz =
365                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
366                         u8 hc_wp_grp_sz =
367                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
368
369                         card->ext_csd.enhanced_area_en = 1;
370                         /*
371                          * calculate the enhanced data area offset, in bytes
372                          */
373                         card->ext_csd.enhanced_area_offset =
374                                 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
375                                 (ext_csd[137] << 8) + ext_csd[136];
376                         if (mmc_card_blockaddr(card))
377                                 card->ext_csd.enhanced_area_offset <<= 9;
378                         /*
379                          * calculate the enhanced data area size, in kilobytes
380                          */
381                         card->ext_csd.enhanced_area_size =
382                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
383                                 ext_csd[140];
384                         card->ext_csd.enhanced_area_size *=
385                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
386                         card->ext_csd.enhanced_area_size <<= 9;
387                 } else {
388                         /*
389                          * If the enhanced area is not enabled, disable these
390                          * device attributes.
391                          */
392                         card->ext_csd.enhanced_area_offset = -EINVAL;
393                         card->ext_csd.enhanced_area_size = -EINVAL;
394                 }
395                 card->ext_csd.sec_trim_mult =
396                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
397                 card->ext_csd.sec_erase_mult =
398                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
399                 card->ext_csd.sec_feature_support =
400                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
401                 card->ext_csd.trim_timeout = 300 *
402                         ext_csd[EXT_CSD_TRIM_MULT];
403         }
404
405         if (card->ext_csd.rev >= 5)
406                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
407
408         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
409                 card->erased_byte = 0xFF;
410         else
411                 card->erased_byte = 0x0;
412
413 out:
414         return err;
415 }
416
417 static inline void mmc_free_ext_csd(u8 *ext_csd)
418 {
419         kfree(ext_csd);
420 }
421
422
423 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
424 {
425         u8 *bw_ext_csd;
426         int err;
427
428         if (bus_width == MMC_BUS_WIDTH_1)
429                 return 0;
430
431         err = mmc_get_ext_csd(card, &bw_ext_csd);
432
433         if (err || bw_ext_csd == NULL) {
434                 if (bus_width != MMC_BUS_WIDTH_1)
435                         err = -EINVAL;
436                 goto out;
437         }
438
439         if (bus_width == MMC_BUS_WIDTH_1)
440                 goto out;
441
442         /* only compare read only fields */
443         err = (!(card->ext_csd.raw_partition_support ==
444                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
445                 (card->ext_csd.raw_erased_mem_count ==
446                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
447                 (card->ext_csd.rev ==
448                         bw_ext_csd[EXT_CSD_REV]) &&
449                 (card->ext_csd.raw_ext_csd_structure ==
450                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
451                 (card->ext_csd.raw_card_type ==
452                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
453                 (card->ext_csd.raw_s_a_timeout ==
454                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
455                 (card->ext_csd.raw_hc_erase_gap_size ==
456                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
457                 (card->ext_csd.raw_erase_timeout_mult ==
458                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
459                 (card->ext_csd.raw_hc_erase_grp_size ==
460                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
461                 (card->ext_csd.raw_sec_trim_mult ==
462                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
463                 (card->ext_csd.raw_sec_erase_mult ==
464                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
465                 (card->ext_csd.raw_sec_feature_support ==
466                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
467                 (card->ext_csd.raw_trim_mult ==
468                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
469                 (card->ext_csd.raw_sectors[0] ==
470                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
471                 (card->ext_csd.raw_sectors[1] ==
472                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
473                 (card->ext_csd.raw_sectors[2] ==
474                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
475                 (card->ext_csd.raw_sectors[3] ==
476                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
477         if (err)
478                 err = -EINVAL;
479
480 out:
481         mmc_free_ext_csd(bw_ext_csd);
482         return err;
483 }
484
485 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
486         card->raw_cid[2], card->raw_cid[3]);
487 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
488         card->raw_csd[2], card->raw_csd[3]);
489 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
490 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
491 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
492 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
493 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
494 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
495 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
496 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
497 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
498 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
499                 card->ext_csd.enhanced_area_offset);
500 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
501
502 static struct attribute *mmc_std_attrs[] = {
503         &dev_attr_cid.attr,
504         &dev_attr_csd.attr,
505         &dev_attr_date.attr,
506         &dev_attr_erase_size.attr,
507         &dev_attr_preferred_erase_size.attr,
508         &dev_attr_fwrev.attr,
509         &dev_attr_hwrev.attr,
510         &dev_attr_manfid.attr,
511         &dev_attr_name.attr,
512         &dev_attr_oemid.attr,
513         &dev_attr_serial.attr,
514         &dev_attr_enhanced_area_offset.attr,
515         &dev_attr_enhanced_area_size.attr,
516         NULL,
517 };
518
519 static struct attribute_group mmc_std_attr_group = {
520         .attrs = mmc_std_attrs,
521 };
522
523 static const struct attribute_group *mmc_attr_groups[] = {
524         &mmc_std_attr_group,
525         NULL,
526 };
527
528 static struct device_type mmc_type = {
529         .groups = mmc_attr_groups,
530 };
531
532 /*
533  * Handle the detection and initialisation of a card.
534  *
535  * In the case of a resume, "oldcard" will contain the card
536  * we're trying to reinitialise.
537  */
538 static int mmc_init_card(struct mmc_host *host, u32 ocr,
539         struct mmc_card *oldcard)
540 {
541         struct mmc_card *card;
542         int err, ddr = 0;
543         u32 cid[4];
544         unsigned int max_dtr;
545         u32 rocr;
546         u8 *ext_csd = NULL;
547
548         BUG_ON(!host);
549         WARN_ON(!host->claimed);
550
551         /* Set correct bus mode for MMC before attempting init */
552         if (!mmc_host_is_spi(host))
553                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
554
555         /*
556          * Since we're changing the OCR value, we seem to
557          * need to tell some cards to go back to the idle
558          * state.  We wait 1ms to give cards time to
559          * respond.
560          * mmc_go_idle is needed for eMMC that are asleep
561          */
562         mmc_go_idle(host);
563
564         /* The extra bit indicates that we support high capacity */
565         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
566         if (err)
567                 goto err;
568
569         /*
570          * For SPI, enable CRC as appropriate.
571          */
572         if (mmc_host_is_spi(host)) {
573                 err = mmc_spi_set_crc(host, use_spi_crc);
574                 if (err)
575                         goto err;
576         }
577
578         /*
579          * Fetch CID from card.
580          */
581         if (mmc_host_is_spi(host))
582                 err = mmc_send_cid(host, cid);
583         else
584                 err = mmc_all_send_cid(host, cid);
585         if (err)
586                 goto err;
587
588         if (oldcard) {
589                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
590                         err = -ENOENT;
591                         goto err;
592                 }
593
594                 card = oldcard;
595         } else {
596                 /*
597                  * Allocate card structure.
598                  */
599                 card = mmc_alloc_card(host, &mmc_type);
600                 if (IS_ERR(card)) {
601                         err = PTR_ERR(card);
602                         goto err;
603                 }
604
605                 card->type = MMC_TYPE_MMC;
606                 card->rca = 1;
607                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
608         }
609
610         /*
611          * For native busses:  set card RCA and quit open drain mode.
612          */
613         if (!mmc_host_is_spi(host)) {
614                 err = mmc_set_relative_addr(card);
615                 if (err)
616                         goto free_card;
617
618                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
619         }
620
621         if (!oldcard) {
622                 /*
623                  * Fetch CSD from card.
624                  */
625                 err = mmc_send_csd(card, card->raw_csd);
626                 if (err)
627                         goto free_card;
628
629                 err = mmc_decode_csd(card);
630                 if (err)
631                         goto free_card;
632                 err = mmc_decode_cid(card);
633                 if (err)
634                         goto free_card;
635         }
636
637         /*
638          * Select card, as all following commands rely on that.
639          */
640         if (!mmc_host_is_spi(host)) {
641                 err = mmc_select_card(card);
642                 if (err)
643                         goto free_card;
644         }
645
646         if (!oldcard) {
647                 /*
648                  * Fetch and process extended CSD.
649                  */
650
651                 err = mmc_get_ext_csd(card, &ext_csd);
652                 if (err)
653                         goto free_card;
654                 err = mmc_read_ext_csd(card, ext_csd);
655                 if (err)
656                         goto free_card;
657
658                 /* If doing byte addressing, check if required to do sector
659                  * addressing.  Handle the case of <2GB cards needing sector
660                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
661                  * ocr register has bit 30 set for sector addressing.
662                  */
663                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
664                         mmc_card_set_blockaddr(card);
665
666                 /* Erase size depends on CSD and Extended CSD */
667                 mmc_set_erase_size(card);
668         }
669
670         /*
671          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
672          * bit.  This bit will be lost every time after a reset or power off.
673          */
674         if (card->ext_csd.enhanced_area_en) {
675                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
676                                  EXT_CSD_ERASE_GROUP_DEF, 1, 0);
677
678                 if (err && err != -EBADMSG)
679                         goto free_card;
680
681                 if (err) {
682                         err = 0;
683                         /*
684                          * Just disable enhanced area off & sz
685                          * will try to enable ERASE_GROUP_DEF
686                          * during next time reinit
687                          */
688                         card->ext_csd.enhanced_area_offset = -EINVAL;
689                         card->ext_csd.enhanced_area_size = -EINVAL;
690                 } else {
691                         card->ext_csd.erase_group_def = 1;
692                         /*
693                          * enable ERASE_GRP_DEF successfully.
694                          * This will affect the erase size, so
695                          * here need to reset erase size
696                          */
697                         mmc_set_erase_size(card);
698                 }
699         }
700
701         /*
702          * Ensure eMMC user default partition is enabled
703          */
704         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
705                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
706                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
707                                  card->ext_csd.part_config,
708                                  card->ext_csd.part_time);
709                 if (err && err != -EBADMSG)
710                         goto free_card;
711         }
712
713         /*
714          * Activate high speed (if supported)
715          */
716         if ((card->ext_csd.hs_max_dtr != 0) &&
717                 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
718                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
719                                  EXT_CSD_HS_TIMING, 1, 0);
720                 if (err && err != -EBADMSG)
721                         goto free_card;
722
723                 if (err) {
724                         printk(KERN_WARNING "%s: switch to highspeed failed\n",
725                                mmc_hostname(card->host));
726                         err = 0;
727                 } else {
728                         mmc_card_set_highspeed(card);
729                         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
730                 }
731         }
732
733         /*
734          * Compute bus speed.
735          */
736         max_dtr = (unsigned int)-1;
737
738         if (mmc_card_highspeed(card)) {
739                 if (max_dtr > card->ext_csd.hs_max_dtr)
740                         max_dtr = card->ext_csd.hs_max_dtr;
741         } else if (max_dtr > card->csd.max_dtr) {
742                 max_dtr = card->csd.max_dtr;
743         }
744
745         mmc_set_clock(host, max_dtr);
746
747         /*
748          * Indicate DDR mode (if supported).
749          */
750         if (mmc_card_highspeed(card)) {
751                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
752                         && ((host->caps & (MMC_CAP_1_8V_DDR |
753                              MMC_CAP_UHS_DDR50))
754                                 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
755                                 ddr = MMC_1_8V_DDR_MODE;
756                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
757                         && ((host->caps & (MMC_CAP_1_2V_DDR |
758                              MMC_CAP_UHS_DDR50))
759                                 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
760                                 ddr = MMC_1_2V_DDR_MODE;
761         }
762
763         /*
764          * Activate wide bus and DDR (if supported).
765          */
766         if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
767             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
768                 static unsigned ext_csd_bits[][2] = {
769                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
770                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
771                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
772                 };
773                 static unsigned bus_widths[] = {
774                         MMC_BUS_WIDTH_8,
775                         MMC_BUS_WIDTH_4,
776                         MMC_BUS_WIDTH_1
777                 };
778                 unsigned idx, bus_width = 0;
779
780                 if (host->caps & MMC_CAP_8_BIT_DATA)
781                         idx = 0;
782                 else
783                         idx = 1;
784                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
785                         bus_width = bus_widths[idx];
786                         if (bus_width == MMC_BUS_WIDTH_1)
787                                 ddr = 0; /* no DDR for 1-bit width */
788                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
789                                          EXT_CSD_BUS_WIDTH,
790                                          ext_csd_bits[idx][0],
791                                          0);
792                         if (!err) {
793                                 mmc_set_bus_width(card->host, bus_width);
794
795                                 /*
796                                  * If controller can't handle bus width test,
797                                  * compare ext_csd previously read in 1 bit mode
798                                  * against ext_csd at new bus width
799                                  */
800                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
801                                         err = mmc_compare_ext_csds(card,
802                                                 bus_width);
803                                 else
804                                         err = mmc_bus_test(card, bus_width);
805                                 if (!err)
806                                         break;
807                         }
808                 }
809
810                 if (!err && ddr) {
811                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
812                                          EXT_CSD_BUS_WIDTH,
813                                          ext_csd_bits[idx][1],
814                                          0);
815                 }
816                 if (err) {
817                         printk(KERN_WARNING "%s: switch to bus width %d ddr %d "
818                                 "failed\n", mmc_hostname(card->host),
819                                 1 << bus_width, ddr);
820                         goto free_card;
821                 } else if (ddr) {
822                         /*
823                          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
824                          * signaling.
825                          *
826                          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
827                          *
828                          * 1.8V vccq at 3.3V core voltage (vcc) is not required
829                          * in the JEDEC spec for DDR.
830                          *
831                          * Do not force change in vccq since we are obviously
832                          * working and no change to vccq is needed.
833                          *
834                          * WARNING: eMMC rules are NOT the same as SD DDR
835                          */
836                         if (ddr == EXT_CSD_CARD_TYPE_DDR_1_2V) {
837                                 err = mmc_set_signal_voltage(host,
838                                         MMC_SIGNAL_VOLTAGE_120, 0);
839                                 if (err)
840                                         goto err;
841                         }
842                         mmc_card_set_ddr_mode(card);
843                         mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
844                         mmc_set_bus_width(card->host, bus_width);
845                 }
846         }
847
848         if (!oldcard)
849                 host->card = card;
850
851         mmc_free_ext_csd(ext_csd);
852         return 0;
853
854 free_card:
855         if (!oldcard)
856                 mmc_remove_card(card);
857 err:
858         mmc_free_ext_csd(ext_csd);
859
860         return err;
861 }
862
863 /*
864  * Host is being removed. Free up the current card.
865  */
866 static void mmc_remove(struct mmc_host *host)
867 {
868         BUG_ON(!host);
869         BUG_ON(!host->card);
870
871         mmc_remove_card(host->card);
872         host->card = NULL;
873 }
874
875 /*
876  * Card detection callback from host.
877  */
878 static void mmc_detect(struct mmc_host *host)
879 {
880         int err;
881
882         BUG_ON(!host);
883         BUG_ON(!host->card);
884
885         mmc_claim_host(host);
886
887         /*
888          * Just check if our card has been removed.
889          */
890         err = mmc_send_status(host->card, NULL);
891
892         mmc_release_host(host);
893
894         if (err) {
895                 mmc_remove(host);
896
897                 mmc_claim_host(host);
898                 mmc_detach_bus(host);
899                 mmc_power_off(host);
900                 mmc_release_host(host);
901         }
902 }
903
904 /*
905  * Suspend callback from host.
906  */
907 static int mmc_suspend(struct mmc_host *host)
908 {
909         int err = 0;
910
911         BUG_ON(!host);
912         BUG_ON(!host->card);
913
914         mmc_claim_host(host);
915         if (mmc_card_can_sleep(host))
916                 err = mmc_card_sleep(host);
917         else if (!mmc_host_is_spi(host))
918                 mmc_deselect_cards(host);
919         host->card->state &= ~MMC_STATE_HIGHSPEED;
920         mmc_release_host(host);
921
922         return err;
923 }
924
925 /*
926  * Resume callback from host.
927  *
928  * This function tries to determine if the same card is still present
929  * and, if so, restore all state to it.
930  */
931 static int mmc_resume(struct mmc_host *host)
932 {
933         int err;
934
935         BUG_ON(!host);
936         BUG_ON(!host->card);
937
938         mmc_claim_host(host);
939         err = mmc_init_card(host, host->ocr, host->card);
940         mmc_release_host(host);
941
942         return err;
943 }
944
945 static int mmc_power_restore(struct mmc_host *host)
946 {
947         int ret;
948
949         host->card->state &= ~MMC_STATE_HIGHSPEED;
950         mmc_claim_host(host);
951         ret = mmc_init_card(host, host->ocr, host->card);
952         mmc_release_host(host);
953
954         return ret;
955 }
956
957 static int mmc_sleep(struct mmc_host *host)
958 {
959         struct mmc_card *card = host->card;
960         int err = -ENOSYS;
961
962         if (card && card->ext_csd.rev >= 3) {
963                 err = mmc_card_sleepawake(host, 1);
964                 if (err < 0)
965                         pr_debug("%s: Error %d while putting card into sleep",
966                                  mmc_hostname(host), err);
967         }
968
969         return err;
970 }
971
972 static int mmc_awake(struct mmc_host *host)
973 {
974         struct mmc_card *card = host->card;
975         int err = -ENOSYS;
976
977         if (card && card->ext_csd.rev >= 3) {
978                 err = mmc_card_sleepawake(host, 0);
979                 if (err < 0)
980                         pr_debug("%s: Error %d while awaking sleeping card",
981                                  mmc_hostname(host), err);
982         }
983
984         return err;
985 }
986
987 static const struct mmc_bus_ops mmc_ops = {
988         .awake = mmc_awake,
989         .sleep = mmc_sleep,
990         .remove = mmc_remove,
991         .detect = mmc_detect,
992         .suspend = NULL,
993         .resume = NULL,
994         .power_restore = mmc_power_restore,
995 };
996
997 static const struct mmc_bus_ops mmc_ops_unsafe = {
998         .awake = mmc_awake,
999         .sleep = mmc_sleep,
1000         .remove = mmc_remove,
1001         .detect = mmc_detect,
1002         .suspend = mmc_suspend,
1003         .resume = mmc_resume,
1004         .power_restore = mmc_power_restore,
1005 };
1006
1007 static void mmc_attach_bus_ops(struct mmc_host *host)
1008 {
1009         const struct mmc_bus_ops *bus_ops;
1010
1011         if (!mmc_card_is_removable(host))
1012                 bus_ops = &mmc_ops_unsafe;
1013         else
1014                 bus_ops = &mmc_ops;
1015         mmc_attach_bus(host, bus_ops);
1016 }
1017
1018 /*
1019  * Starting point for MMC card init.
1020  */
1021 int mmc_attach_mmc(struct mmc_host *host)
1022 {
1023         int err;
1024         u32 ocr;
1025
1026         BUG_ON(!host);
1027         WARN_ON(!host->claimed);
1028
1029         /* Set correct bus mode for MMC before attempting attach */
1030         if (!mmc_host_is_spi(host))
1031                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1032
1033         err = mmc_send_op_cond(host, 0, &ocr);
1034         if (err)
1035                 return err;
1036
1037         mmc_attach_bus_ops(host);
1038         if (host->ocr_avail_mmc)
1039                 host->ocr_avail = host->ocr_avail_mmc;
1040
1041         /*
1042          * We need to get OCR a different way for SPI.
1043          */
1044         if (mmc_host_is_spi(host)) {
1045                 err = mmc_spi_read_ocr(host, 1, &ocr);
1046                 if (err)
1047                         goto err;
1048         }
1049
1050         /*
1051          * Sanity check the voltages that the card claims to
1052          * support.
1053          */
1054         if (ocr & 0x7F) {
1055                 printk(KERN_WARNING "%s: card claims to support voltages "
1056                        "below the defined range. These will be ignored.\n",
1057                        mmc_hostname(host));
1058                 ocr &= ~0x7F;
1059         }
1060
1061         host->ocr = mmc_select_voltage(host, ocr);
1062
1063         /*
1064          * Can we support the voltage of the card?
1065          */
1066         if (!host->ocr) {
1067                 err = -EINVAL;
1068                 goto err;
1069         }
1070
1071         /*
1072          * Detect and init the card.
1073          */
1074         err = mmc_init_card(host, host->ocr, NULL);
1075         if (err)
1076                 goto err;
1077
1078         mmc_release_host(host);
1079         err = mmc_add_card(host->card);
1080         mmc_claim_host(host);
1081         if (err)
1082                 goto remove_card;
1083
1084         return 0;
1085
1086 remove_card:
1087         mmc_release_host(host);
1088         mmc_remove_card(host->card);
1089         mmc_claim_host(host);
1090         host->card = NULL;
1091 err:
1092         mmc_detach_bus(host);
1093
1094         printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
1095                 mmc_hostname(host), err);
1096
1097         return err;
1098 }