mmc: core: add eMMC hardware reset support
[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                 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
408         }
409
410         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
411                 card->erased_byte = 0xFF;
412         else
413                 card->erased_byte = 0x0;
414
415 out:
416         return err;
417 }
418
419 static inline void mmc_free_ext_csd(u8 *ext_csd)
420 {
421         kfree(ext_csd);
422 }
423
424
425 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
426 {
427         u8 *bw_ext_csd;
428         int err;
429
430         if (bus_width == MMC_BUS_WIDTH_1)
431                 return 0;
432
433         err = mmc_get_ext_csd(card, &bw_ext_csd);
434
435         if (err || bw_ext_csd == NULL) {
436                 if (bus_width != MMC_BUS_WIDTH_1)
437                         err = -EINVAL;
438                 goto out;
439         }
440
441         if (bus_width == MMC_BUS_WIDTH_1)
442                 goto out;
443
444         /* only compare read only fields */
445         err = (!(card->ext_csd.raw_partition_support ==
446                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
447                 (card->ext_csd.raw_erased_mem_count ==
448                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
449                 (card->ext_csd.rev ==
450                         bw_ext_csd[EXT_CSD_REV]) &&
451                 (card->ext_csd.raw_ext_csd_structure ==
452                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
453                 (card->ext_csd.raw_card_type ==
454                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
455                 (card->ext_csd.raw_s_a_timeout ==
456                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
457                 (card->ext_csd.raw_hc_erase_gap_size ==
458                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
459                 (card->ext_csd.raw_erase_timeout_mult ==
460                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
461                 (card->ext_csd.raw_hc_erase_grp_size ==
462                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
463                 (card->ext_csd.raw_sec_trim_mult ==
464                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
465                 (card->ext_csd.raw_sec_erase_mult ==
466                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
467                 (card->ext_csd.raw_sec_feature_support ==
468                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
469                 (card->ext_csd.raw_trim_mult ==
470                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
471                 (card->ext_csd.raw_sectors[0] ==
472                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
473                 (card->ext_csd.raw_sectors[1] ==
474                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
475                 (card->ext_csd.raw_sectors[2] ==
476                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
477                 (card->ext_csd.raw_sectors[3] ==
478                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
479         if (err)
480                 err = -EINVAL;
481
482 out:
483         mmc_free_ext_csd(bw_ext_csd);
484         return err;
485 }
486
487 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
488         card->raw_cid[2], card->raw_cid[3]);
489 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
490         card->raw_csd[2], card->raw_csd[3]);
491 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
492 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
493 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
494 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
495 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
496 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
497 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
498 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
499 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
500 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
501                 card->ext_csd.enhanced_area_offset);
502 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
503
504 static struct attribute *mmc_std_attrs[] = {
505         &dev_attr_cid.attr,
506         &dev_attr_csd.attr,
507         &dev_attr_date.attr,
508         &dev_attr_erase_size.attr,
509         &dev_attr_preferred_erase_size.attr,
510         &dev_attr_fwrev.attr,
511         &dev_attr_hwrev.attr,
512         &dev_attr_manfid.attr,
513         &dev_attr_name.attr,
514         &dev_attr_oemid.attr,
515         &dev_attr_serial.attr,
516         &dev_attr_enhanced_area_offset.attr,
517         &dev_attr_enhanced_area_size.attr,
518         NULL,
519 };
520
521 static struct attribute_group mmc_std_attr_group = {
522         .attrs = mmc_std_attrs,
523 };
524
525 static const struct attribute_group *mmc_attr_groups[] = {
526         &mmc_std_attr_group,
527         NULL,
528 };
529
530 static struct device_type mmc_type = {
531         .groups = mmc_attr_groups,
532 };
533
534 /*
535  * Handle the detection and initialisation of a card.
536  *
537  * In the case of a resume, "oldcard" will contain the card
538  * we're trying to reinitialise.
539  */
540 static int mmc_init_card(struct mmc_host *host, u32 ocr,
541         struct mmc_card *oldcard)
542 {
543         struct mmc_card *card;
544         int err, ddr = 0;
545         u32 cid[4];
546         unsigned int max_dtr;
547         u32 rocr;
548         u8 *ext_csd = NULL;
549
550         BUG_ON(!host);
551         WARN_ON(!host->claimed);
552
553         /* Set correct bus mode for MMC before attempting init */
554         if (!mmc_host_is_spi(host))
555                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
556
557         /*
558          * Since we're changing the OCR value, we seem to
559          * need to tell some cards to go back to the idle
560          * state.  We wait 1ms to give cards time to
561          * respond.
562          * mmc_go_idle is needed for eMMC that are asleep
563          */
564         mmc_go_idle(host);
565
566         /* The extra bit indicates that we support high capacity */
567         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
568         if (err)
569                 goto err;
570
571         /*
572          * For SPI, enable CRC as appropriate.
573          */
574         if (mmc_host_is_spi(host)) {
575                 err = mmc_spi_set_crc(host, use_spi_crc);
576                 if (err)
577                         goto err;
578         }
579
580         /*
581          * Fetch CID from card.
582          */
583         if (mmc_host_is_spi(host))
584                 err = mmc_send_cid(host, cid);
585         else
586                 err = mmc_all_send_cid(host, cid);
587         if (err)
588                 goto err;
589
590         if (oldcard) {
591                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
592                         err = -ENOENT;
593                         goto err;
594                 }
595
596                 card = oldcard;
597         } else {
598                 /*
599                  * Allocate card structure.
600                  */
601                 card = mmc_alloc_card(host, &mmc_type);
602                 if (IS_ERR(card)) {
603                         err = PTR_ERR(card);
604                         goto err;
605                 }
606
607                 card->type = MMC_TYPE_MMC;
608                 card->rca = 1;
609                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
610         }
611
612         /*
613          * For native busses:  set card RCA and quit open drain mode.
614          */
615         if (!mmc_host_is_spi(host)) {
616                 err = mmc_set_relative_addr(card);
617                 if (err)
618                         goto free_card;
619
620                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
621         }
622
623         if (!oldcard) {
624                 /*
625                  * Fetch CSD from card.
626                  */
627                 err = mmc_send_csd(card, card->raw_csd);
628                 if (err)
629                         goto free_card;
630
631                 err = mmc_decode_csd(card);
632                 if (err)
633                         goto free_card;
634                 err = mmc_decode_cid(card);
635                 if (err)
636                         goto free_card;
637         }
638
639         /*
640          * Select card, as all following commands rely on that.
641          */
642         if (!mmc_host_is_spi(host)) {
643                 err = mmc_select_card(card);
644                 if (err)
645                         goto free_card;
646         }
647
648         if (!oldcard) {
649                 /*
650                  * Fetch and process extended CSD.
651                  */
652
653                 err = mmc_get_ext_csd(card, &ext_csd);
654                 if (err)
655                         goto free_card;
656                 err = mmc_read_ext_csd(card, ext_csd);
657                 if (err)
658                         goto free_card;
659
660                 /* If doing byte addressing, check if required to do sector
661                  * addressing.  Handle the case of <2GB cards needing sector
662                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
663                  * ocr register has bit 30 set for sector addressing.
664                  */
665                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
666                         mmc_card_set_blockaddr(card);
667
668                 /* Erase size depends on CSD and Extended CSD */
669                 mmc_set_erase_size(card);
670         }
671
672         /*
673          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
674          * bit.  This bit will be lost every time after a reset or power off.
675          */
676         if (card->ext_csd.enhanced_area_en) {
677                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
678                                  EXT_CSD_ERASE_GROUP_DEF, 1, 0);
679
680                 if (err && err != -EBADMSG)
681                         goto free_card;
682
683                 if (err) {
684                         err = 0;
685                         /*
686                          * Just disable enhanced area off & sz
687                          * will try to enable ERASE_GROUP_DEF
688                          * during next time reinit
689                          */
690                         card->ext_csd.enhanced_area_offset = -EINVAL;
691                         card->ext_csd.enhanced_area_size = -EINVAL;
692                 } else {
693                         card->ext_csd.erase_group_def = 1;
694                         /*
695                          * enable ERASE_GRP_DEF successfully.
696                          * This will affect the erase size, so
697                          * here need to reset erase size
698                          */
699                         mmc_set_erase_size(card);
700                 }
701         }
702
703         /*
704          * Ensure eMMC user default partition is enabled
705          */
706         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
707                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
708                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
709                                  card->ext_csd.part_config,
710                                  card->ext_csd.part_time);
711                 if (err && err != -EBADMSG)
712                         goto free_card;
713         }
714
715         /*
716          * Activate high speed (if supported)
717          */
718         if ((card->ext_csd.hs_max_dtr != 0) &&
719                 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
720                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
721                                  EXT_CSD_HS_TIMING, 1, 0);
722                 if (err && err != -EBADMSG)
723                         goto free_card;
724
725                 if (err) {
726                         printk(KERN_WARNING "%s: switch to highspeed failed\n",
727                                mmc_hostname(card->host));
728                         err = 0;
729                 } else {
730                         mmc_card_set_highspeed(card);
731                         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
732                 }
733         }
734
735         /*
736          * Compute bus speed.
737          */
738         max_dtr = (unsigned int)-1;
739
740         if (mmc_card_highspeed(card)) {
741                 if (max_dtr > card->ext_csd.hs_max_dtr)
742                         max_dtr = card->ext_csd.hs_max_dtr;
743         } else if (max_dtr > card->csd.max_dtr) {
744                 max_dtr = card->csd.max_dtr;
745         }
746
747         mmc_set_clock(host, max_dtr);
748
749         /*
750          * Indicate DDR mode (if supported).
751          */
752         if (mmc_card_highspeed(card)) {
753                 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
754                         && ((host->caps & (MMC_CAP_1_8V_DDR |
755                              MMC_CAP_UHS_DDR50))
756                                 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
757                                 ddr = MMC_1_8V_DDR_MODE;
758                 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
759                         && ((host->caps & (MMC_CAP_1_2V_DDR |
760                              MMC_CAP_UHS_DDR50))
761                                 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
762                                 ddr = MMC_1_2V_DDR_MODE;
763         }
764
765         /*
766          * Activate wide bus and DDR (if supported).
767          */
768         if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
769             (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
770                 static unsigned ext_csd_bits[][2] = {
771                         { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
772                         { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
773                         { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
774                 };
775                 static unsigned bus_widths[] = {
776                         MMC_BUS_WIDTH_8,
777                         MMC_BUS_WIDTH_4,
778                         MMC_BUS_WIDTH_1
779                 };
780                 unsigned idx, bus_width = 0;
781
782                 if (host->caps & MMC_CAP_8_BIT_DATA)
783                         idx = 0;
784                 else
785                         idx = 1;
786                 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
787                         bus_width = bus_widths[idx];
788                         if (bus_width == MMC_BUS_WIDTH_1)
789                                 ddr = 0; /* no DDR for 1-bit width */
790                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
791                                          EXT_CSD_BUS_WIDTH,
792                                          ext_csd_bits[idx][0],
793                                          0);
794                         if (!err) {
795                                 mmc_set_bus_width(card->host, bus_width);
796
797                                 /*
798                                  * If controller can't handle bus width test,
799                                  * compare ext_csd previously read in 1 bit mode
800                                  * against ext_csd at new bus width
801                                  */
802                                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
803                                         err = mmc_compare_ext_csds(card,
804                                                 bus_width);
805                                 else
806                                         err = mmc_bus_test(card, bus_width);
807                                 if (!err)
808                                         break;
809                         }
810                 }
811
812                 if (!err && ddr) {
813                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
814                                          EXT_CSD_BUS_WIDTH,
815                                          ext_csd_bits[idx][1],
816                                          0);
817                 }
818                 if (err) {
819                         printk(KERN_WARNING "%s: switch to bus width %d ddr %d "
820                                 "failed\n", mmc_hostname(card->host),
821                                 1 << bus_width, ddr);
822                         goto free_card;
823                 } else if (ddr) {
824                         /*
825                          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
826                          * signaling.
827                          *
828                          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
829                          *
830                          * 1.8V vccq at 3.3V core voltage (vcc) is not required
831                          * in the JEDEC spec for DDR.
832                          *
833                          * Do not force change in vccq since we are obviously
834                          * working and no change to vccq is needed.
835                          *
836                          * WARNING: eMMC rules are NOT the same as SD DDR
837                          */
838                         if (ddr == EXT_CSD_CARD_TYPE_DDR_1_2V) {
839                                 err = mmc_set_signal_voltage(host,
840                                         MMC_SIGNAL_VOLTAGE_120, 0);
841                                 if (err)
842                                         goto err;
843                         }
844                         mmc_card_set_ddr_mode(card);
845                         mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
846                         mmc_set_bus_width(card->host, bus_width);
847                 }
848         }
849
850         if (!oldcard)
851                 host->card = card;
852
853         mmc_free_ext_csd(ext_csd);
854         return 0;
855
856 free_card:
857         if (!oldcard)
858                 mmc_remove_card(card);
859 err:
860         mmc_free_ext_csd(ext_csd);
861
862         return err;
863 }
864
865 /*
866  * Host is being removed. Free up the current card.
867  */
868 static void mmc_remove(struct mmc_host *host)
869 {
870         BUG_ON(!host);
871         BUG_ON(!host->card);
872
873         mmc_remove_card(host->card);
874         host->card = NULL;
875 }
876
877 /*
878  * Card detection callback from host.
879  */
880 static void mmc_detect(struct mmc_host *host)
881 {
882         int err;
883
884         BUG_ON(!host);
885         BUG_ON(!host->card);
886
887         mmc_claim_host(host);
888
889         /*
890          * Just check if our card has been removed.
891          */
892         err = mmc_send_status(host->card, NULL);
893
894         mmc_release_host(host);
895
896         if (err) {
897                 mmc_remove(host);
898
899                 mmc_claim_host(host);
900                 mmc_detach_bus(host);
901                 mmc_power_off(host);
902                 mmc_release_host(host);
903         }
904 }
905
906 /*
907  * Suspend callback from host.
908  */
909 static int mmc_suspend(struct mmc_host *host)
910 {
911         int err = 0;
912
913         BUG_ON(!host);
914         BUG_ON(!host->card);
915
916         mmc_claim_host(host);
917         if (mmc_card_can_sleep(host))
918                 err = mmc_card_sleep(host);
919         else if (!mmc_host_is_spi(host))
920                 mmc_deselect_cards(host);
921         host->card->state &= ~MMC_STATE_HIGHSPEED;
922         mmc_release_host(host);
923
924         return err;
925 }
926
927 /*
928  * Resume callback from host.
929  *
930  * This function tries to determine if the same card is still present
931  * and, if so, restore all state to it.
932  */
933 static int mmc_resume(struct mmc_host *host)
934 {
935         int err;
936
937         BUG_ON(!host);
938         BUG_ON(!host->card);
939
940         mmc_claim_host(host);
941         err = mmc_init_card(host, host->ocr, host->card);
942         mmc_release_host(host);
943
944         return err;
945 }
946
947 static int mmc_power_restore(struct mmc_host *host)
948 {
949         int ret;
950
951         host->card->state &= ~MMC_STATE_HIGHSPEED;
952         mmc_claim_host(host);
953         ret = mmc_init_card(host, host->ocr, host->card);
954         mmc_release_host(host);
955
956         return ret;
957 }
958
959 static int mmc_sleep(struct mmc_host *host)
960 {
961         struct mmc_card *card = host->card;
962         int err = -ENOSYS;
963
964         if (card && card->ext_csd.rev >= 3) {
965                 err = mmc_card_sleepawake(host, 1);
966                 if (err < 0)
967                         pr_debug("%s: Error %d while putting card into sleep",
968                                  mmc_hostname(host), err);
969         }
970
971         return err;
972 }
973
974 static int mmc_awake(struct mmc_host *host)
975 {
976         struct mmc_card *card = host->card;
977         int err = -ENOSYS;
978
979         if (card && card->ext_csd.rev >= 3) {
980                 err = mmc_card_sleepawake(host, 0);
981                 if (err < 0)
982                         pr_debug("%s: Error %d while awaking sleeping card",
983                                  mmc_hostname(host), err);
984         }
985
986         return err;
987 }
988
989 static const struct mmc_bus_ops mmc_ops = {
990         .awake = mmc_awake,
991         .sleep = mmc_sleep,
992         .remove = mmc_remove,
993         .detect = mmc_detect,
994         .suspend = NULL,
995         .resume = NULL,
996         .power_restore = mmc_power_restore,
997 };
998
999 static const struct mmc_bus_ops mmc_ops_unsafe = {
1000         .awake = mmc_awake,
1001         .sleep = mmc_sleep,
1002         .remove = mmc_remove,
1003         .detect = mmc_detect,
1004         .suspend = mmc_suspend,
1005         .resume = mmc_resume,
1006         .power_restore = mmc_power_restore,
1007 };
1008
1009 static void mmc_attach_bus_ops(struct mmc_host *host)
1010 {
1011         const struct mmc_bus_ops *bus_ops;
1012
1013         if (!mmc_card_is_removable(host))
1014                 bus_ops = &mmc_ops_unsafe;
1015         else
1016                 bus_ops = &mmc_ops;
1017         mmc_attach_bus(host, bus_ops);
1018 }
1019
1020 /*
1021  * Starting point for MMC card init.
1022  */
1023 int mmc_attach_mmc(struct mmc_host *host)
1024 {
1025         int err;
1026         u32 ocr;
1027
1028         BUG_ON(!host);
1029         WARN_ON(!host->claimed);
1030
1031         /* Set correct bus mode for MMC before attempting attach */
1032         if (!mmc_host_is_spi(host))
1033                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1034
1035         err = mmc_send_op_cond(host, 0, &ocr);
1036         if (err)
1037                 return err;
1038
1039         mmc_attach_bus_ops(host);
1040         if (host->ocr_avail_mmc)
1041                 host->ocr_avail = host->ocr_avail_mmc;
1042
1043         /*
1044          * We need to get OCR a different way for SPI.
1045          */
1046         if (mmc_host_is_spi(host)) {
1047                 err = mmc_spi_read_ocr(host, 1, &ocr);
1048                 if (err)
1049                         goto err;
1050         }
1051
1052         /*
1053          * Sanity check the voltages that the card claims to
1054          * support.
1055          */
1056         if (ocr & 0x7F) {
1057                 printk(KERN_WARNING "%s: card claims to support voltages "
1058                        "below the defined range. These will be ignored.\n",
1059                        mmc_hostname(host));
1060                 ocr &= ~0x7F;
1061         }
1062
1063         host->ocr = mmc_select_voltage(host, ocr);
1064
1065         /*
1066          * Can we support the voltage of the card?
1067          */
1068         if (!host->ocr) {
1069                 err = -EINVAL;
1070                 goto err;
1071         }
1072
1073         /*
1074          * Detect and init the card.
1075          */
1076         err = mmc_init_card(host, host->ocr, NULL);
1077         if (err)
1078                 goto err;
1079
1080         mmc_release_host(host);
1081         err = mmc_add_card(host->card);
1082         mmc_claim_host(host);
1083         if (err)
1084                 goto remove_card;
1085
1086         return 0;
1087
1088 remove_card:
1089         mmc_release_host(host);
1090         mmc_remove_card(host->card);
1091         mmc_claim_host(host);
1092         host->card = NULL;
1093 err:
1094         mmc_detach_bus(host);
1095
1096         printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
1097                 mmc_hostname(host), err);
1098
1099         return err;
1100 }