mmc: core: Fix hangs related to insert/remove of cards
[linux-2.6.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         /*
552          * Since we're changing the OCR value, we seem to
553          * need to tell some cards to go back to the idle
554          * state.  We wait 1ms to give cards time to
555          * respond.
556          * mmc_go_idle is needed for eMMC that are asleep
557          */
558         mmc_go_idle(host);
559
560         /* The extra bit indicates that we support high capacity */
561         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
562         if (err)
563                 goto err;
564
565         /*
566          * For SPI, enable CRC as appropriate.
567          */
568         if (mmc_host_is_spi(host)) {
569                 err = mmc_spi_set_crc(host, use_spi_crc);
570                 if (err)
571                         goto err;
572         }
573
574         /*
575          * Fetch CID from card.
576          */
577         if (mmc_host_is_spi(host))
578                 err = mmc_send_cid(host, cid);
579         else
580                 err = mmc_all_send_cid(host, cid);
581         if (err)
582                 goto err;
583
584         if (oldcard) {
585                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
586                         err = -ENOENT;
587                         goto err;
588                 }
589
590                 card = oldcard;
591         } else {
592                 /*
593                  * Allocate card structure.
594                  */
595                 card = mmc_alloc_card(host, &mmc_type);
596                 if (IS_ERR(card)) {
597                         err = PTR_ERR(card);
598                         goto err;
599                 }
600
601                 card->type = MMC_TYPE_MMC;
602                 card->rca = 1;
603                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
604         }
605
606         /*
607          * For native busses:  set card RCA and quit open drain mode.
608          */
609         if (!mmc_host_is_spi(host)) {
610                 err = mmc_set_relative_addr(card);
611                 if (err)
612                         goto free_card;
613
614                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
615         }
616
617         if (!oldcard) {
618                 /*
619                  * Fetch CSD from card.
620                  */
621                 err = mmc_send_csd(card, card->raw_csd);
622                 if (err)
623                         goto free_card;
624
625                 err = mmc_decode_csd(card);
626                 if (err)
627                         goto free_card;
628                 err = mmc_decode_cid(card);
629                 if (err)
630                         goto free_card;
631         }
632
633         /*
634          * Select card, as all following commands rely on that.
635          */
636         if (!mmc_host_is_spi(host)) {
637                 err = mmc_select_card(card);
638                 if (err)
639                         goto free_card;
640         }
641
642         if (!oldcard) {
643                 /*
644                  * Fetch and process extended CSD.
645                  */
646
647                 err = mmc_get_ext_csd(card, &ext_csd);
648                 if (err)
649                         goto free_card;
650                 err = mmc_read_ext_csd(card, ext_csd);
651                 if (err)
652                         goto free_card;
653
654                 /* If doing byte addressing, check if required to do sector
655                  * addressing.  Handle the case of <2GB cards needing sector
656                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
657                  * ocr register has bit 30 set for sector addressing.
658                  */
659                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
660                         mmc_card_set_blockaddr(card);
661
662                 /* Erase size depends on CSD and Extended CSD */
663                 mmc_set_erase_size(card);
664         }
665
666         /*
667          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
668          * bit.  This bit will be lost every time after a reset or power off.
669          */
670         if (card->ext_csd.enhanced_area_en) {
671                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
672                                  EXT_CSD_ERASE_GROUP_DEF, 1, 0);
673
674                 if (err && err != -EBADMSG)
675                         goto free_card;
676
677                 if (err) {
678                         err = 0;
679                         /*
680                          * Just disable enhanced area off & sz
681                          * will try to enable ERASE_GROUP_DEF
682                          * during next time reinit
683                          */
684                         card->ext_csd.enhanced_area_offset = -EINVAL;
685                         card->ext_csd.enhanced_area_size = -EINVAL;
686                 } else {
687                         card->ext_csd.erase_group_def = 1;
688                         /*
689                          * enable ERASE_GRP_DEF successfully.
690                          * This will affect the erase size, so
691                          * here need to reset erase size
692                          */
693                         mmc_set_erase_size(card);
694                 }
695         }
696
697         /*
698          * Ensure eMMC user default partition is enabled
699          */
700         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
701                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
702                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
703                                  card->ext_csd.part_config,
704                                  card->ext_csd.part_time);
705                 if (err && err != -EBADMSG)
706                         goto free_card;
707         }
708
709         /*
710          * Activate high speed (if supported)
711          */
712         if ((card->ext_csd.hs_max_dtr != 0) &&
713                 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
714                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
715                                  EXT_CSD_HS_TIMING, 1, 0);
716                 if (err && err != -EBADMSG)
717                         goto free_card;
718
719                 if (err) {
720                         printk(KERN_WARNING "%s: switch to highspeed failed\n",
721                                mmc_hostname(card->host));
722                         err = 0;
723                 } else {
724                         mmc_card_set_highspeed(card);
725                         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
726                 }
727         }
728
729         /*
730          * Compute bus speed.
731          */
732         max_dtr = (unsigned int)-1;
733
734         if (mmc_card_highspeed(card)) {
735                 if (max_dtr > card->ext_csd.hs_max_dtr)
736                         max_dtr = card->ext_csd.hs_max_dtr;
737         } else if (max_dtr > card->csd.max_dtr) {
738                 max_dtr = card->csd.max_dtr;
739         }
740
741         mmc_set_clock(host, max_dtr);
742
743         /*
744          * Indicate DDR mode (if supported).
745          */
746         if (mmc_card_highspeed(card)) {
747                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
748                         && ((host->caps & (MMC_CAP_1_8V_DDR |
749                              MMC_CAP_UHS_DDR50))
750                                 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
751                                 ddr = MMC_1_8V_DDR_MODE;
752                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
753                         && ((host->caps & (MMC_CAP_1_2V_DDR |
754                              MMC_CAP_UHS_DDR50))
755                                 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
756                                 ddr = MMC_1_2V_DDR_MODE;
757         }
758
759         /*
760          * Activate wide bus and DDR (if supported).
761          */
762         if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
763             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
764                 static unsigned ext_csd_bits[][2] = {
765                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
766                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
767                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
768                 };
769                 static unsigned bus_widths[] = {
770                         MMC_BUS_WIDTH_8,
771                         MMC_BUS_WIDTH_4,
772                         MMC_BUS_WIDTH_1
773                 };
774                 unsigned idx, bus_width = 0;
775
776                 if (host->caps & MMC_CAP_8_BIT_DATA)
777                         idx = 0;
778                 else
779                         idx = 1;
780                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
781                         bus_width = bus_widths[idx];
782                         if (bus_width == MMC_BUS_WIDTH_1)
783                                 ddr = 0; /* no DDR for 1-bit width */
784                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
785                                          EXT_CSD_BUS_WIDTH,
786                                          ext_csd_bits[idx][0],
787                                          0);
788                         if (!err) {
789                                 mmc_set_bus_width(card->host, bus_width);
790
791                                 /*
792                                  * If controller can't handle bus width test,
793                                  * compare ext_csd previously read in 1 bit mode
794                                  * against ext_csd at new bus width
795                                  */
796                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
797                                         err = mmc_compare_ext_csds(card,
798                                                 bus_width);
799                                 else
800                                         err = mmc_bus_test(card, bus_width);
801                                 if (!err)
802                                         break;
803                         }
804                 }
805
806                 if (!err && ddr) {
807                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
808                                          EXT_CSD_BUS_WIDTH,
809                                          ext_csd_bits[idx][1],
810                                          0);
811                 }
812                 if (err) {
813                         printk(KERN_WARNING "%s: switch to bus width %d ddr %d "
814                                 "failed\n", mmc_hostname(card->host),
815                                 1 << bus_width, ddr);
816                         goto free_card;
817                 } else if (ddr) {
818                         /*
819                          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
820                          * signaling.
821                          *
822                          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
823                          *
824                          * 1.8V vccq at 3.3V core voltage (vcc) is not required
825                          * in the JEDEC spec for DDR.
826                          *
827                          * Do not force change in vccq since we are obviously
828                          * working and no change to vccq is needed.
829                          *
830                          * WARNING: eMMC rules are NOT the same as SD DDR
831                          */
832                         if (ddr == EXT_CSD_CARD_TYPE_DDR_1_2V) {
833                                 err = mmc_set_signal_voltage(host,
834                                         MMC_SIGNAL_VOLTAGE_120, 0);
835                                 if (err)
836                                         goto err;
837                         }
838                         mmc_card_set_ddr_mode(card);
839                         mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
840                         mmc_set_bus_width(card->host, bus_width);
841                 }
842         }
843
844         if (!oldcard)
845                 host->card = card;
846
847         mmc_free_ext_csd(ext_csd);
848         return 0;
849
850 free_card:
851         if (!oldcard)
852                 mmc_remove_card(card);
853 err:
854         mmc_free_ext_csd(ext_csd);
855
856         return err;
857 }
858
859 /*
860  * Host is being removed. Free up the current card.
861  */
862 static void mmc_remove(struct mmc_host *host)
863 {
864         BUG_ON(!host);
865         BUG_ON(!host->card);
866
867         mmc_remove_card(host->card);
868         host->card = NULL;
869 }
870
871 /*
872  * Card detection callback from host.
873  */
874 static void mmc_detect(struct mmc_host *host)
875 {
876         int err;
877
878         BUG_ON(!host);
879         BUG_ON(!host->card);
880
881         mmc_claim_host(host);
882
883         /*
884          * Just check if our card has been removed.
885          */
886         err = mmc_send_status(host->card, NULL);
887
888         mmc_release_host(host);
889
890         if (err) {
891                 mmc_remove(host);
892
893                 mmc_claim_host(host);
894                 mmc_detach_bus(host);
895                 mmc_power_off(host);
896                 mmc_release_host(host);
897         }
898 }
899
900 /*
901  * Suspend callback from host.
902  */
903 static int mmc_suspend(struct mmc_host *host)
904 {
905         int err = 0;
906
907         BUG_ON(!host);
908         BUG_ON(!host->card);
909
910         mmc_claim_host(host);
911         if (mmc_card_can_sleep(host))
912                 err = mmc_card_sleep(host);
913         else if (!mmc_host_is_spi(host))
914                 mmc_deselect_cards(host);
915         host->card->state &= ~MMC_STATE_HIGHSPEED;
916         mmc_release_host(host);
917
918         return err;
919 }
920
921 /*
922  * Resume callback from host.
923  *
924  * This function tries to determine if the same card is still present
925  * and, if so, restore all state to it.
926  */
927 static int mmc_resume(struct mmc_host *host)
928 {
929         int err;
930
931         BUG_ON(!host);
932         BUG_ON(!host->card);
933
934         mmc_claim_host(host);
935         err = mmc_init_card(host, host->ocr, host->card);
936         mmc_release_host(host);
937
938         return err;
939 }
940
941 static int mmc_power_restore(struct mmc_host *host)
942 {
943         int ret;
944
945         host->card->state &= ~MMC_STATE_HIGHSPEED;
946         mmc_claim_host(host);
947         ret = mmc_init_card(host, host->ocr, host->card);
948         mmc_release_host(host);
949
950         return ret;
951 }
952
953 static int mmc_sleep(struct mmc_host *host)
954 {
955         struct mmc_card *card = host->card;
956         int err = -ENOSYS;
957
958         if (card && card->ext_csd.rev >= 3) {
959                 err = mmc_card_sleepawake(host, 1);
960                 if (err < 0)
961                         pr_debug("%s: Error %d while putting card into sleep",
962                                  mmc_hostname(host), err);
963         }
964
965         return err;
966 }
967
968 static int mmc_awake(struct mmc_host *host)
969 {
970         struct mmc_card *card = host->card;
971         int err = -ENOSYS;
972
973         if (card && card->ext_csd.rev >= 3) {
974                 err = mmc_card_sleepawake(host, 0);
975                 if (err < 0)
976                         pr_debug("%s: Error %d while awaking sleeping card",
977                                  mmc_hostname(host), err);
978         }
979
980         return err;
981 }
982
983 static const struct mmc_bus_ops mmc_ops = {
984         .awake = mmc_awake,
985         .sleep = mmc_sleep,
986         .remove = mmc_remove,
987         .detect = mmc_detect,
988         .suspend = NULL,
989         .resume = NULL,
990         .power_restore = mmc_power_restore,
991 };
992
993 static const struct mmc_bus_ops mmc_ops_unsafe = {
994         .awake = mmc_awake,
995         .sleep = mmc_sleep,
996         .remove = mmc_remove,
997         .detect = mmc_detect,
998         .suspend = mmc_suspend,
999         .resume = mmc_resume,
1000         .power_restore = mmc_power_restore,
1001 };
1002
1003 static void mmc_attach_bus_ops(struct mmc_host *host)
1004 {
1005         const struct mmc_bus_ops *bus_ops;
1006
1007         if (!mmc_card_is_removable(host))
1008                 bus_ops = &mmc_ops_unsafe;
1009         else
1010                 bus_ops = &mmc_ops;
1011         mmc_attach_bus(host, bus_ops);
1012 }
1013
1014 /*
1015  * Starting point for MMC card init.
1016  */
1017 int mmc_attach_mmc(struct mmc_host *host)
1018 {
1019         int err;
1020         u32 ocr;
1021
1022         BUG_ON(!host);
1023         WARN_ON(!host->claimed);
1024
1025         err = mmc_send_op_cond(host, 0, &ocr);
1026         if (err)
1027                 return err;
1028
1029         mmc_attach_bus_ops(host);
1030         if (host->ocr_avail_mmc)
1031                 host->ocr_avail = host->ocr_avail_mmc;
1032
1033         /*
1034          * We need to get OCR a different way for SPI.
1035          */
1036         if (mmc_host_is_spi(host)) {
1037                 err = mmc_spi_read_ocr(host, 1, &ocr);
1038                 if (err)
1039                         goto err;
1040         }
1041
1042         /*
1043          * Sanity check the voltages that the card claims to
1044          * support.
1045          */
1046         if (ocr & 0x7F) {
1047                 printk(KERN_WARNING "%s: card claims to support voltages "
1048                        "below the defined range. These will be ignored.\n",
1049                        mmc_hostname(host));
1050                 ocr &= ~0x7F;
1051         }
1052
1053         host->ocr = mmc_select_voltage(host, ocr);
1054
1055         /*
1056          * Can we support the voltage of the card?
1057          */
1058         if (!host->ocr) {
1059                 err = -EINVAL;
1060                 goto err;
1061         }
1062
1063         /*
1064          * Detect and init the card.
1065          */
1066         err = mmc_init_card(host, host->ocr, NULL);
1067         if (err)
1068                 goto err;
1069
1070         mmc_release_host(host);
1071         err = mmc_add_card(host->card);
1072         mmc_claim_host(host);
1073         if (err)
1074                 goto remove_card;
1075
1076         return 0;
1077
1078 remove_card:
1079         mmc_release_host(host);
1080         mmc_remove_card(host->card);
1081         mmc_claim_host(host);
1082         host->card = NULL;
1083 err:
1084         mmc_detach_bus(host);
1085
1086         printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
1087                 mmc_hostname(host), err);
1088
1089         return err;
1090 }