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1/*
2 * linux/drivers/mmc/core/mmc.c
3 *
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
6 * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/err.h>
14#include <linux/slab.h>
15
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
25static const unsigned int tran_exp[] = {
26 10000, 100000, 1000000, 10000000,
27 0, 0, 0, 0
28};
29
30static 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
35static const unsigned int tacc_exp[] = {
36 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
37};
38
39static 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 */
61static 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
112static 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 */
125static 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 */
179static 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 */
240static 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
413out:
414 return err;
415}
416
417static inline void mmc_free_ext_csd(u8 *ext_csd)
418{
419 kfree(ext_csd);
420}
421
422
423static 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
480out:
481 mmc_free_ext_csd(bw_ext_csd);
482 return err;
483}
484
485MMC_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]);
487MMC_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]);
489MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
490MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
491MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
492MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
493MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
494MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
495MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
496MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
497MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
498MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
499 card->ext_csd.enhanced_area_offset);
500MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
501
502static 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
519static struct attribute_group mmc_std_attr_group = {
520 .attrs = mmc_std_attrs,
521};
522
523static const struct attribute_group *mmc_attr_groups[] = {
524 &mmc_std_attr_group,
525 NULL,
526};
527
528static 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 */
538static 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 */
557 mmc_go_idle(host);
558
559 /* The extra bit indicates that we support high capacity */
560 err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
561 if (err)
562 goto err;
563
564 /*
565 * For SPI, enable CRC as appropriate.
566 */
567 if (mmc_host_is_spi(host)) {
568 err = mmc_spi_set_crc(host, use_spi_crc);
569 if (err)
570 goto err;
571 }
572
573 /*
574 * Fetch CID from card.
575 */
576 if (mmc_host_is_spi(host))
577 err = mmc_send_cid(host, cid);
578 else
579 err = mmc_all_send_cid(host, cid);
580 if (err)
581 goto err;
582
583 if (oldcard) {
584 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
585 err = -ENOENT;
586 goto err;
587 }
588
589 card = oldcard;
590 } else {
591 /*
592 * Allocate card structure.
593 */
594 card = mmc_alloc_card(host, &mmc_type);
595 if (IS_ERR(card)) {
596 err = PTR_ERR(card);
597 goto err;
598 }
599
600 card->type = MMC_TYPE_MMC;
601 card->rca = 1;
602 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
603 }
604
605 /*
606 * For native busses: set card RCA and quit open drain mode.
607 */
608 if (!mmc_host_is_spi(host)) {
609 err = mmc_set_relative_addr(card);
610 if (err)
611 goto free_card;
612
613 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
614 }
615
616 if (!oldcard) {
617 /*
618 * Fetch CSD from card.
619 */
620 err = mmc_send_csd(card, card->raw_csd);
621 if (err)
622 goto free_card;
623
624 err = mmc_decode_csd(card);
625 if (err)
626 goto free_card;
627 err = mmc_decode_cid(card);
628 if (err)
629 goto free_card;
630 }
631
632 /*
633 * Select card, as all following commands rely on that.
634 */
635 if (!mmc_host_is_spi(host)) {
636 err = mmc_select_card(card);
637 if (err)
638 goto free_card;
639 }
640
641 if (!oldcard) {
642 /*
643 * Fetch and process extended CSD.
644 */
645
646 err = mmc_get_ext_csd(card, &ext_csd);
647 if (err)
648 goto free_card;
649 err = mmc_read_ext_csd(card, ext_csd);
650 if (err)
651 goto free_card;
652
653 /* If doing byte addressing, check if required to do sector
654 * addressing. Handle the case of <2GB cards needing sector
655 * addressing. See section 8.1 JEDEC Standard JED84-A441;
656 * ocr register has bit 30 set for sector addressing.
657 */
658 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
659 mmc_card_set_blockaddr(card);
660
661 /* Erase size depends on CSD and Extended CSD */
662 mmc_set_erase_size(card);
663 }
664
665 /*
666 * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
667 * bit. This bit will be lost every time after a reset or power off.
668 */
669 if (card->ext_csd.enhanced_area_en) {
670 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
671 EXT_CSD_ERASE_GROUP_DEF, 1, 0);
672
673 if (err && err != -EBADMSG)
674 goto free_card;
675
676 if (err) {
677 err = 0;
678 /*
679 * Just disable enhanced area off & sz
680 * will try to enable ERASE_GROUP_DEF
681 * during next time reinit
682 */
683 card->ext_csd.enhanced_area_offset = -EINVAL;
684 card->ext_csd.enhanced_area_size = -EINVAL;
685 } else {
686 card->ext_csd.erase_group_def = 1;
687 /*
688 * enable ERASE_GRP_DEF successfully.
689 * This will affect the erase size, so
690 * here need to reset erase size
691 */
692 mmc_set_erase_size(card);
693 }
694 }
695
696 /*
697 * Ensure eMMC user default partition is enabled
698 */
699 if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
700 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
701 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
702 card->ext_csd.part_config,
703 card->ext_csd.part_time);
704 if (err && err != -EBADMSG)
705 goto free_card;
706 }
707
708 /*
709 * Activate high speed (if supported)
710 */
711 if ((card->ext_csd.hs_max_dtr != 0) &&
712 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
713 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
714 EXT_CSD_HS_TIMING, 1, 0);
715 if (err && err != -EBADMSG)
716 goto free_card;
717
718 if (err) {
719 printk(KERN_WARNING "%s: switch to highspeed failed\n",
720 mmc_hostname(card->host));
721 err = 0;
722 } else {
723 mmc_card_set_highspeed(card);
724 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
725 }
726 }
727
728 /*
729 * Compute bus speed.
730 */
731 max_dtr = (unsigned int)-1;
732
733 if (mmc_card_highspeed(card)) {
734 if (max_dtr > card->ext_csd.hs_max_dtr)
735 max_dtr = card->ext_csd.hs_max_dtr;
736 } else if (max_dtr > card->csd.max_dtr) {
737 max_dtr = card->csd.max_dtr;
738 }
739
740 mmc_set_clock(host, max_dtr);
741
742 /*
743 * Indicate DDR mode (if supported).
744 */
745 if (mmc_card_highspeed(card)) {
746 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
747 && ((host->caps & (MMC_CAP_1_8V_DDR |
748 MMC_CAP_UHS_DDR50))
749 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
750 ddr = MMC_1_8V_DDR_MODE;
751 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
752 && ((host->caps & (MMC_CAP_1_2V_DDR |
753 MMC_CAP_UHS_DDR50))
754 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
755 ddr = MMC_1_2V_DDR_MODE;
756 }
757
758 /*
759 * Activate wide bus and DDR (if supported).
760 */
761 if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
762 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
763 static unsigned ext_csd_bits[][2] = {
764 { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
765 { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
766 { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
767 };
768 static unsigned bus_widths[] = {
769 MMC_BUS_WIDTH_8,
770 MMC_BUS_WIDTH_4,
771 MMC_BUS_WIDTH_1
772 };
773 unsigned idx, bus_width = 0;
774
775 if (host->caps & MMC_CAP_8_BIT_DATA)
776 idx = 0;
777 else
778 idx = 1;
779 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
780 bus_width = bus_widths[idx];
781 if (bus_width == MMC_BUS_WIDTH_1)
782 ddr = 0; /* no DDR for 1-bit width */
783 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
784 EXT_CSD_BUS_WIDTH,
785 ext_csd_bits[idx][0],
786 0);
787 if (!err) {
788 mmc_set_bus_width(card->host, bus_width);
789
790 /*
791 * If controller can't handle bus width test,
792 * compare ext_csd previously read in 1 bit mode
793 * against ext_csd at new bus width
794 */
795 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
796 err = mmc_compare_ext_csds(card,
797 bus_width);
798 else
799 err = mmc_bus_test(card, bus_width);
800 if (!err)
801 break;
802 }
803 }
804
805 if (!err && ddr) {
806 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
807 EXT_CSD_BUS_WIDTH,
808 ext_csd_bits[idx][1],
809 0);
810 }
811 if (err) {
812 printk(KERN_WARNING "%s: switch to bus width %d ddr %d "
813 "failed\n", mmc_hostname(card->host),
814 1 << bus_width, ddr);
815 goto free_card;
816 } else if (ddr) {
817 /*
818 * eMMC cards can support 3.3V to 1.2V i/o (vccq)
819 * signaling.
820 *
821 * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
822 *
823 * 1.8V vccq at 3.3V core voltage (vcc) is not required
824 * in the JEDEC spec for DDR.
825 *
826 * Do not force change in vccq since we are obviously
827 * working and no change to vccq is needed.
828 *
829 * WARNING: eMMC rules are NOT the same as SD DDR
830 */
831 if (ddr == EXT_CSD_CARD_TYPE_DDR_1_2V) {
832 err = mmc_set_signal_voltage(host,
833 MMC_SIGNAL_VOLTAGE_120, 0);
834 if (err)
835 goto err;
836 }
837 mmc_card_set_ddr_mode(card);
838 mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
839 mmc_set_bus_width(card->host, bus_width);
840 }
841 }
842
843 if (!oldcard)
844 host->card = card;
845
846 mmc_free_ext_csd(ext_csd);
847 return 0;
848
849free_card:
850 if (!oldcard)
851 mmc_remove_card(card);
852err:
853 mmc_free_ext_csd(ext_csd);
854
855 return err;
856}
857
858/*
859 * Host is being removed. Free up the current card.
860 */
861static void mmc_remove(struct mmc_host *host)
862{
863 BUG_ON(!host);
864 BUG_ON(!host->card);
865
866 mmc_remove_card(host->card);
867 host->card = NULL;
868}
869
870/*
871 * Card detection callback from host.
872 */
873static void mmc_detect(struct mmc_host *host)
874{
875 int err;
876
877 BUG_ON(!host);
878 BUG_ON(!host->card);
879
880 mmc_claim_host(host);
881
882 /*
883 * Just check if our card has been removed.
884 */
885 err = mmc_send_status(host->card, NULL);
886
887 mmc_release_host(host);
888
889 if (err) {
890 mmc_remove(host);
891
892 mmc_claim_host(host);
893 mmc_detach_bus(host);
894 mmc_release_host(host);
895 }
896}
897
898/*
899 * Suspend callback from host.
900 */
901static int mmc_suspend(struct mmc_host *host)
902{
903 BUG_ON(!host);
904 BUG_ON(!host->card);
905
906 mmc_claim_host(host);
907 if (!mmc_host_is_spi(host))
908 mmc_deselect_cards(host);
909 host->card->state &= ~MMC_STATE_HIGHSPEED;
910 mmc_release_host(host);
911
912 return 0;
913}
914
915/*
916 * Resume callback from host.
917 *
918 * This function tries to determine if the same card is still present
919 * and, if so, restore all state to it.
920 */
921static int mmc_resume(struct mmc_host *host)
922{
923 int err;
924
925 BUG_ON(!host);
926 BUG_ON(!host->card);
927
928 mmc_claim_host(host);
929 err = mmc_init_card(host, host->ocr, host->card);
930 mmc_release_host(host);
931
932 return err;
933}
934
935static int mmc_power_restore(struct mmc_host *host)
936{
937 int ret;
938
939 host->card->state &= ~MMC_STATE_HIGHSPEED;
940 mmc_claim_host(host);
941 ret = mmc_init_card(host, host->ocr, host->card);
942 mmc_release_host(host);
943
944 return ret;
945}
946
947static int mmc_sleep(struct mmc_host *host)
948{
949 struct mmc_card *card = host->card;
950 int err = -ENOSYS;
951
952 if (card && card->ext_csd.rev >= 3) {
953 err = mmc_card_sleepawake(host, 1);
954 if (err < 0)
955 pr_debug("%s: Error %d while putting card into sleep",
956 mmc_hostname(host), err);
957 }
958
959 return err;
960}
961
962static int mmc_awake(struct mmc_host *host)
963{
964 struct mmc_card *card = host->card;
965 int err = -ENOSYS;
966
967 if (card && card->ext_csd.rev >= 3) {
968 err = mmc_card_sleepawake(host, 0);
969 if (err < 0)
970 pr_debug("%s: Error %d while awaking sleeping card",
971 mmc_hostname(host), err);
972 }
973
974 return err;
975}
976
977static const struct mmc_bus_ops mmc_ops = {
978 .awake = mmc_awake,
979 .sleep = mmc_sleep,
980 .remove = mmc_remove,
981 .detect = mmc_detect,
982 .suspend = NULL,
983 .resume = NULL,
984 .power_restore = mmc_power_restore,
985};
986
987static const struct mmc_bus_ops mmc_ops_unsafe = {
988 .awake = mmc_awake,
989 .sleep = mmc_sleep,
990 .remove = mmc_remove,
991 .detect = mmc_detect,
992 .suspend = mmc_suspend,
993 .resume = mmc_resume,
994 .power_restore = mmc_power_restore,
995};
996
997static void mmc_attach_bus_ops(struct mmc_host *host)
998{
999 const struct mmc_bus_ops *bus_ops;
1000
1001 if (!mmc_card_is_removable(host))
1002 bus_ops = &mmc_ops_unsafe;
1003 else
1004 bus_ops = &mmc_ops;
1005 mmc_attach_bus(host, bus_ops);
1006}
1007
1008/*
1009 * Starting point for MMC card init.
1010 */
1011int mmc_attach_mmc(struct mmc_host *host)
1012{
1013 int err;
1014 u32 ocr;
1015
1016 BUG_ON(!host);
1017 WARN_ON(!host->claimed);
1018
1019 err = mmc_send_op_cond(host, 0, &ocr);
1020 if (err)
1021 return err;
1022
1023 mmc_attach_bus_ops(host);
1024 if (host->ocr_avail_mmc)
1025 host->ocr_avail = host->ocr_avail_mmc;
1026
1027 /*
1028 * We need to get OCR a different way for SPI.
1029 */
1030 if (mmc_host_is_spi(host)) {
1031 err = mmc_spi_read_ocr(host, 1, &ocr);
1032 if (err)
1033 goto err;
1034 }
1035
1036 /*
1037 * Sanity check the voltages that the card claims to
1038 * support.
1039 */
1040 if (ocr & 0x7F) {
1041 printk(KERN_WARNING "%s: card claims to support voltages "
1042 "below the defined range. These will be ignored.\n",
1043 mmc_hostname(host));
1044 ocr &= ~0x7F;
1045 }
1046
1047 host->ocr = mmc_select_voltage(host, ocr);
1048
1049 /*
1050 * Can we support the voltage of the card?
1051 */
1052 if (!host->ocr) {
1053 err = -EINVAL;
1054 goto err;
1055 }
1056
1057 /*
1058 * Detect and init the card.
1059 */
1060 err = mmc_init_card(host, host->ocr, NULL);
1061 if (err)
1062 goto err;
1063
1064 mmc_release_host(host);
1065 err = mmc_add_card(host->card);
1066 mmc_claim_host(host);
1067 if (err)
1068 goto remove_card;
1069
1070 return 0;
1071
1072remove_card:
1073 mmc_release_host(host);
1074 mmc_remove_card(host->card);
1075 mmc_claim_host(host);
1076 host->card = NULL;
1077err:
1078 mmc_detach_bus(host);
1079
1080 printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
1081 mmc_hostname(host), err);
1082
1083 return err;
1084}
1/*
2 * linux/drivers/mmc/core/mmc.c
3 *
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
6 * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/err.h>
14#include <linux/slab.h>
15#include <linux/stat.h>
16
17#include <linux/mmc/host.h>
18#include <linux/mmc/card.h>
19#include <linux/mmc/mmc.h>
20
21#include "core.h"
22#include "bus.h"
23#include "mmc_ops.h"
24#include "sd_ops.h"
25
26static const unsigned int tran_exp[] = {
27 10000, 100000, 1000000, 10000000,
28 0, 0, 0, 0
29};
30
31static const unsigned char tran_mant[] = {
32 0, 10, 12, 13, 15, 20, 25, 30,
33 35, 40, 45, 50, 55, 60, 70, 80,
34};
35
36static const unsigned int tacc_exp[] = {
37 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
38};
39
40static const unsigned int tacc_mant[] = {
41 0, 10, 12, 13, 15, 20, 25, 30,
42 35, 40, 45, 50, 55, 60, 70, 80,
43};
44
45#define UNSTUFF_BITS(resp,start,size) \
46 ({ \
47 const int __size = size; \
48 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
49 const int __off = 3 - ((start) / 32); \
50 const int __shft = (start) & 31; \
51 u32 __res; \
52 \
53 __res = resp[__off] >> __shft; \
54 if (__size + __shft > 32) \
55 __res |= resp[__off-1] << ((32 - __shft) % 32); \
56 __res & __mask; \
57 })
58
59/*
60 * Given the decoded CSD structure, decode the raw CID to our CID structure.
61 */
62static int mmc_decode_cid(struct mmc_card *card)
63{
64 u32 *resp = card->raw_cid;
65
66 /*
67 * The selection of the format here is based upon published
68 * specs from sandisk and from what people have reported.
69 */
70 switch (card->csd.mmca_vsn) {
71 case 0: /* MMC v1.0 - v1.2 */
72 case 1: /* MMC v1.4 */
73 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
74 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
75 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
76 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
77 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
78 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
79 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
80 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
81 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
82 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
83 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
84 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
85 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
86 break;
87
88 case 2: /* MMC v2.0 - v2.2 */
89 case 3: /* MMC v3.1 - v3.3 */
90 case 4: /* MMC v4 */
91 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
92 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
93 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
94 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
95 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
96 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
97 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
98 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
99 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
100 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
101 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
102 break;
103
104 default:
105 pr_err("%s: card has unknown MMCA version %d\n",
106 mmc_hostname(card->host), card->csd.mmca_vsn);
107 return -EINVAL;
108 }
109
110 return 0;
111}
112
113static void mmc_set_erase_size(struct mmc_card *card)
114{
115 if (card->ext_csd.erase_group_def & 1)
116 card->erase_size = card->ext_csd.hc_erase_size;
117 else
118 card->erase_size = card->csd.erase_size;
119
120 mmc_init_erase(card);
121}
122
123/*
124 * Given a 128-bit response, decode to our card CSD structure.
125 */
126static int mmc_decode_csd(struct mmc_card *card)
127{
128 struct mmc_csd *csd = &card->csd;
129 unsigned int e, m, a, b;
130 u32 *resp = card->raw_csd;
131
132 /*
133 * We only understand CSD structure v1.1 and v1.2.
134 * v1.2 has extra information in bits 15, 11 and 10.
135 * We also support eMMC v4.4 & v4.41.
136 */
137 csd->structure = UNSTUFF_BITS(resp, 126, 2);
138 if (csd->structure == 0) {
139 pr_err("%s: unrecognised CSD structure version %d\n",
140 mmc_hostname(card->host), csd->structure);
141 return -EINVAL;
142 }
143
144 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
145 m = UNSTUFF_BITS(resp, 115, 4);
146 e = UNSTUFF_BITS(resp, 112, 3);
147 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
148 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
149
150 m = UNSTUFF_BITS(resp, 99, 4);
151 e = UNSTUFF_BITS(resp, 96, 3);
152 csd->max_dtr = tran_exp[e] * tran_mant[m];
153 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
154
155 e = UNSTUFF_BITS(resp, 47, 3);
156 m = UNSTUFF_BITS(resp, 62, 12);
157 csd->capacity = (1 + m) << (e + 2);
158
159 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
160 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
161 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
162 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
163 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
164 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
165 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
166
167 if (csd->write_blkbits >= 9) {
168 a = UNSTUFF_BITS(resp, 42, 5);
169 b = UNSTUFF_BITS(resp, 37, 5);
170 csd->erase_size = (a + 1) * (b + 1);
171 csd->erase_size <<= csd->write_blkbits - 9;
172 }
173
174 return 0;
175}
176
177/*
178 * Read extended CSD.
179 */
180static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
181{
182 int err;
183 u8 *ext_csd;
184
185 BUG_ON(!card);
186 BUG_ON(!new_ext_csd);
187
188 *new_ext_csd = NULL;
189
190 if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
191 return 0;
192
193 /*
194 * As the ext_csd is so large and mostly unused, we don't store the
195 * raw block in mmc_card.
196 */
197 ext_csd = kmalloc(512, GFP_KERNEL);
198 if (!ext_csd) {
199 pr_err("%s: could not allocate a buffer to "
200 "receive the ext_csd.\n", mmc_hostname(card->host));
201 return -ENOMEM;
202 }
203
204 err = mmc_send_ext_csd(card, ext_csd);
205 if (err) {
206 kfree(ext_csd);
207 *new_ext_csd = NULL;
208
209 /* If the host or the card can't do the switch,
210 * fail more gracefully. */
211 if ((err != -EINVAL)
212 && (err != -ENOSYS)
213 && (err != -EFAULT))
214 return err;
215
216 /*
217 * High capacity cards should have this "magic" size
218 * stored in their CSD.
219 */
220 if (card->csd.capacity == (4096 * 512)) {
221 pr_err("%s: unable to read EXT_CSD "
222 "on a possible high capacity card. "
223 "Card will be ignored.\n",
224 mmc_hostname(card->host));
225 } else {
226 pr_warning("%s: unable to read "
227 "EXT_CSD, performance might "
228 "suffer.\n",
229 mmc_hostname(card->host));
230 err = 0;
231 }
232 } else
233 *new_ext_csd = ext_csd;
234
235 return err;
236}
237
238static void mmc_select_card_type(struct mmc_card *card)
239{
240 struct mmc_host *host = card->host;
241 u8 card_type = card->ext_csd.raw_card_type & EXT_CSD_CARD_TYPE_MASK;
242 unsigned int caps = host->caps, caps2 = host->caps2;
243 unsigned int hs_max_dtr = 0;
244
245 if (card_type & EXT_CSD_CARD_TYPE_26)
246 hs_max_dtr = MMC_HIGH_26_MAX_DTR;
247
248 if (caps & MMC_CAP_MMC_HIGHSPEED &&
249 card_type & EXT_CSD_CARD_TYPE_52)
250 hs_max_dtr = MMC_HIGH_52_MAX_DTR;
251
252 if ((caps & MMC_CAP_1_8V_DDR &&
253 card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) ||
254 (caps & MMC_CAP_1_2V_DDR &&
255 card_type & EXT_CSD_CARD_TYPE_DDR_1_2V))
256 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
257
258 if ((caps2 & MMC_CAP2_HS200_1_8V_SDR &&
259 card_type & EXT_CSD_CARD_TYPE_SDR_1_8V) ||
260 (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
261 card_type & EXT_CSD_CARD_TYPE_SDR_1_2V))
262 hs_max_dtr = MMC_HS200_MAX_DTR;
263
264 card->ext_csd.hs_max_dtr = hs_max_dtr;
265 card->ext_csd.card_type = card_type;
266}
267
268/*
269 * Decode extended CSD.
270 */
271static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
272{
273 int err = 0, idx;
274 unsigned int part_size;
275 u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0;
276
277 BUG_ON(!card);
278
279 if (!ext_csd)
280 return 0;
281
282 /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
283 card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
284 if (card->csd.structure == 3) {
285 if (card->ext_csd.raw_ext_csd_structure > 2) {
286 pr_err("%s: unrecognised EXT_CSD structure "
287 "version %d\n", mmc_hostname(card->host),
288 card->ext_csd.raw_ext_csd_structure);
289 err = -EINVAL;
290 goto out;
291 }
292 }
293
294 card->ext_csd.rev = ext_csd[EXT_CSD_REV];
295 if (card->ext_csd.rev > 6) {
296 pr_err("%s: unrecognised EXT_CSD revision %d\n",
297 mmc_hostname(card->host), card->ext_csd.rev);
298 err = -EINVAL;
299 goto out;
300 }
301
302 card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
303 card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
304 card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
305 card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
306 if (card->ext_csd.rev >= 2) {
307 card->ext_csd.sectors =
308 ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
309 ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
310 ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
311 ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
312
313 /* Cards with density > 2GiB are sector addressed */
314 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
315 mmc_card_set_blockaddr(card);
316 }
317
318 card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
319 mmc_select_card_type(card);
320
321 card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
322 card->ext_csd.raw_erase_timeout_mult =
323 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
324 card->ext_csd.raw_hc_erase_grp_size =
325 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
326 if (card->ext_csd.rev >= 3) {
327 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
328 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
329
330 /* EXT_CSD value is in units of 10ms, but we store in ms */
331 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
332
333 /* Sleep / awake timeout in 100ns units */
334 if (sa_shift > 0 && sa_shift <= 0x17)
335 card->ext_csd.sa_timeout =
336 1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
337 card->ext_csd.erase_group_def =
338 ext_csd[EXT_CSD_ERASE_GROUP_DEF];
339 card->ext_csd.hc_erase_timeout = 300 *
340 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
341 card->ext_csd.hc_erase_size =
342 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
343
344 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
345
346 /*
347 * There are two boot regions of equal size, defined in
348 * multiples of 128K.
349 */
350 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
351 for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
352 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
353 mmc_part_add(card, part_size,
354 EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
355 "boot%d", idx, true,
356 MMC_BLK_DATA_AREA_BOOT);
357 }
358 }
359 }
360
361 card->ext_csd.raw_hc_erase_gap_size =
362 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
363 card->ext_csd.raw_sec_trim_mult =
364 ext_csd[EXT_CSD_SEC_TRIM_MULT];
365 card->ext_csd.raw_sec_erase_mult =
366 ext_csd[EXT_CSD_SEC_ERASE_MULT];
367 card->ext_csd.raw_sec_feature_support =
368 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
369 card->ext_csd.raw_trim_mult =
370 ext_csd[EXT_CSD_TRIM_MULT];
371 if (card->ext_csd.rev >= 4) {
372 /*
373 * Enhanced area feature support -- check whether the eMMC
374 * card has the Enhanced area enabled. If so, export enhanced
375 * area offset and size to user by adding sysfs interface.
376 */
377 card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
378 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
379 (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
380 hc_erase_grp_sz =
381 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
382 hc_wp_grp_sz =
383 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
384
385 card->ext_csd.enhanced_area_en = 1;
386 /*
387 * calculate the enhanced data area offset, in bytes
388 */
389 card->ext_csd.enhanced_area_offset =
390 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
391 (ext_csd[137] << 8) + ext_csd[136];
392 if (mmc_card_blockaddr(card))
393 card->ext_csd.enhanced_area_offset <<= 9;
394 /*
395 * calculate the enhanced data area size, in kilobytes
396 */
397 card->ext_csd.enhanced_area_size =
398 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
399 ext_csd[140];
400 card->ext_csd.enhanced_area_size *=
401 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
402 card->ext_csd.enhanced_area_size <<= 9;
403 } else {
404 /*
405 * If the enhanced area is not enabled, disable these
406 * device attributes.
407 */
408 card->ext_csd.enhanced_area_offset = -EINVAL;
409 card->ext_csd.enhanced_area_size = -EINVAL;
410 }
411
412 /*
413 * General purpose partition feature support --
414 * If ext_csd has the size of general purpose partitions,
415 * set size, part_cfg, partition name in mmc_part.
416 */
417 if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
418 EXT_CSD_PART_SUPPORT_PART_EN) {
419 if (card->ext_csd.enhanced_area_en != 1) {
420 hc_erase_grp_sz =
421 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
422 hc_wp_grp_sz =
423 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
424
425 card->ext_csd.enhanced_area_en = 1;
426 }
427
428 for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
429 if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
430 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
431 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
432 continue;
433 part_size =
434 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
435 << 16) +
436 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
437 << 8) +
438 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
439 part_size *= (size_t)(hc_erase_grp_sz *
440 hc_wp_grp_sz);
441 mmc_part_add(card, part_size << 19,
442 EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
443 "gp%d", idx, false,
444 MMC_BLK_DATA_AREA_GP);
445 }
446 }
447 card->ext_csd.sec_trim_mult =
448 ext_csd[EXT_CSD_SEC_TRIM_MULT];
449 card->ext_csd.sec_erase_mult =
450 ext_csd[EXT_CSD_SEC_ERASE_MULT];
451 card->ext_csd.sec_feature_support =
452 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
453 card->ext_csd.trim_timeout = 300 *
454 ext_csd[EXT_CSD_TRIM_MULT];
455
456 /*
457 * Note that the call to mmc_part_add above defaults to read
458 * only. If this default assumption is changed, the call must
459 * take into account the value of boot_locked below.
460 */
461 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
462 card->ext_csd.boot_ro_lockable = true;
463 }
464
465 if (card->ext_csd.rev >= 5) {
466 /* check whether the eMMC card supports HPI */
467 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) {
468 card->ext_csd.hpi = 1;
469 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
470 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
471 else
472 card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
473 /*
474 * Indicate the maximum timeout to close
475 * a command interrupted by HPI
476 */
477 card->ext_csd.out_of_int_time =
478 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
479 }
480
481 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
482 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
483 }
484
485 card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
486 if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
487 card->erased_byte = 0xFF;
488 else
489 card->erased_byte = 0x0;
490
491 /* eMMC v4.5 or later */
492 if (card->ext_csd.rev >= 6) {
493 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
494
495 card->ext_csd.generic_cmd6_time = 10 *
496 ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
497 card->ext_csd.power_off_longtime = 10 *
498 ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
499
500 card->ext_csd.cache_size =
501 ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
502 ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
503 ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
504 ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
505
506 if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
507 card->ext_csd.data_sector_size = 4096;
508 else
509 card->ext_csd.data_sector_size = 512;
510
511 if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
512 (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
513 card->ext_csd.data_tag_unit_size =
514 ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
515 (card->ext_csd.data_sector_size);
516 } else {
517 card->ext_csd.data_tag_unit_size = 0;
518 }
519 } else {
520 card->ext_csd.data_sector_size = 512;
521 }
522
523out:
524 return err;
525}
526
527static inline void mmc_free_ext_csd(u8 *ext_csd)
528{
529 kfree(ext_csd);
530}
531
532
533static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
534{
535 u8 *bw_ext_csd;
536 int err;
537
538 if (bus_width == MMC_BUS_WIDTH_1)
539 return 0;
540
541 err = mmc_get_ext_csd(card, &bw_ext_csd);
542
543 if (err || bw_ext_csd == NULL) {
544 err = -EINVAL;
545 goto out;
546 }
547
548 /* only compare read only fields */
549 err = !((card->ext_csd.raw_partition_support ==
550 bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
551 (card->ext_csd.raw_erased_mem_count ==
552 bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
553 (card->ext_csd.rev ==
554 bw_ext_csd[EXT_CSD_REV]) &&
555 (card->ext_csd.raw_ext_csd_structure ==
556 bw_ext_csd[EXT_CSD_STRUCTURE]) &&
557 (card->ext_csd.raw_card_type ==
558 bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
559 (card->ext_csd.raw_s_a_timeout ==
560 bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
561 (card->ext_csd.raw_hc_erase_gap_size ==
562 bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
563 (card->ext_csd.raw_erase_timeout_mult ==
564 bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
565 (card->ext_csd.raw_hc_erase_grp_size ==
566 bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
567 (card->ext_csd.raw_sec_trim_mult ==
568 bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
569 (card->ext_csd.raw_sec_erase_mult ==
570 bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
571 (card->ext_csd.raw_sec_feature_support ==
572 bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
573 (card->ext_csd.raw_trim_mult ==
574 bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
575 (card->ext_csd.raw_sectors[0] ==
576 bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
577 (card->ext_csd.raw_sectors[1] ==
578 bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
579 (card->ext_csd.raw_sectors[2] ==
580 bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
581 (card->ext_csd.raw_sectors[3] ==
582 bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
583 if (err)
584 err = -EINVAL;
585
586out:
587 mmc_free_ext_csd(bw_ext_csd);
588 return err;
589}
590
591MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
592 card->raw_cid[2], card->raw_cid[3]);
593MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
594 card->raw_csd[2], card->raw_csd[3]);
595MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
596MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
597MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
598MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
599MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
600MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
601MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
602MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
603MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
604MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
605 card->ext_csd.enhanced_area_offset);
606MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
607
608static struct attribute *mmc_std_attrs[] = {
609 &dev_attr_cid.attr,
610 &dev_attr_csd.attr,
611 &dev_attr_date.attr,
612 &dev_attr_erase_size.attr,
613 &dev_attr_preferred_erase_size.attr,
614 &dev_attr_fwrev.attr,
615 &dev_attr_hwrev.attr,
616 &dev_attr_manfid.attr,
617 &dev_attr_name.attr,
618 &dev_attr_oemid.attr,
619 &dev_attr_serial.attr,
620 &dev_attr_enhanced_area_offset.attr,
621 &dev_attr_enhanced_area_size.attr,
622 NULL,
623};
624
625static struct attribute_group mmc_std_attr_group = {
626 .attrs = mmc_std_attrs,
627};
628
629static const struct attribute_group *mmc_attr_groups[] = {
630 &mmc_std_attr_group,
631 NULL,
632};
633
634static struct device_type mmc_type = {
635 .groups = mmc_attr_groups,
636};
637
638/*
639 * Select the PowerClass for the current bus width
640 * If power class is defined for 4/8 bit bus in the
641 * extended CSD register, select it by executing the
642 * mmc_switch command.
643 */
644static int mmc_select_powerclass(struct mmc_card *card,
645 unsigned int bus_width, u8 *ext_csd)
646{
647 int err = 0;
648 unsigned int pwrclass_val;
649 unsigned int index = 0;
650 struct mmc_host *host;
651
652 BUG_ON(!card);
653
654 host = card->host;
655 BUG_ON(!host);
656
657 if (ext_csd == NULL)
658 return 0;
659
660 /* Power class selection is supported for versions >= 4.0 */
661 if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
662 return 0;
663
664 /* Power class values are defined only for 4/8 bit bus */
665 if (bus_width == EXT_CSD_BUS_WIDTH_1)
666 return 0;
667
668 switch (1 << host->ios.vdd) {
669 case MMC_VDD_165_195:
670 if (host->ios.clock <= 26000000)
671 index = EXT_CSD_PWR_CL_26_195;
672 else if (host->ios.clock <= 52000000)
673 index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
674 EXT_CSD_PWR_CL_52_195 :
675 EXT_CSD_PWR_CL_DDR_52_195;
676 else if (host->ios.clock <= 200000000)
677 index = EXT_CSD_PWR_CL_200_195;
678 break;
679 case MMC_VDD_27_28:
680 case MMC_VDD_28_29:
681 case MMC_VDD_29_30:
682 case MMC_VDD_30_31:
683 case MMC_VDD_31_32:
684 case MMC_VDD_32_33:
685 case MMC_VDD_33_34:
686 case MMC_VDD_34_35:
687 case MMC_VDD_35_36:
688 if (host->ios.clock <= 26000000)
689 index = EXT_CSD_PWR_CL_26_360;
690 else if (host->ios.clock <= 52000000)
691 index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
692 EXT_CSD_PWR_CL_52_360 :
693 EXT_CSD_PWR_CL_DDR_52_360;
694 else if (host->ios.clock <= 200000000)
695 index = EXT_CSD_PWR_CL_200_360;
696 break;
697 default:
698 pr_warning("%s: Voltage range not supported "
699 "for power class.\n", mmc_hostname(host));
700 return -EINVAL;
701 }
702
703 pwrclass_val = ext_csd[index];
704
705 if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
706 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
707 EXT_CSD_PWR_CL_8BIT_SHIFT;
708 else
709 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
710 EXT_CSD_PWR_CL_4BIT_SHIFT;
711
712 /* If the power class is different from the default value */
713 if (pwrclass_val > 0) {
714 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
715 EXT_CSD_POWER_CLASS,
716 pwrclass_val,
717 card->ext_csd.generic_cmd6_time);
718 }
719
720 return err;
721}
722
723/*
724 * Selects the desired buswidth and switch to the HS200 mode
725 * if bus width set without error
726 */
727static int mmc_select_hs200(struct mmc_card *card)
728{
729 int idx, err = -EINVAL;
730 struct mmc_host *host;
731 static unsigned ext_csd_bits[] = {
732 EXT_CSD_BUS_WIDTH_4,
733 EXT_CSD_BUS_WIDTH_8,
734 };
735 static unsigned bus_widths[] = {
736 MMC_BUS_WIDTH_4,
737 MMC_BUS_WIDTH_8,
738 };
739
740 BUG_ON(!card);
741
742 host = card->host;
743
744 if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V &&
745 host->caps2 & MMC_CAP2_HS200_1_2V_SDR)
746 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120, 0);
747
748 if (err && card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_8V &&
749 host->caps2 & MMC_CAP2_HS200_1_8V_SDR)
750 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, 0);
751
752 /* If fails try again during next card power cycle */
753 if (err)
754 goto err;
755
756 idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 1 : 0;
757
758 /*
759 * Unlike SD, MMC cards dont have a configuration register to notify
760 * supported bus width. So bus test command should be run to identify
761 * the supported bus width or compare the ext csd values of current
762 * bus width and ext csd values of 1 bit mode read earlier.
763 */
764 for (; idx >= 0; idx--) {
765
766 /*
767 * Host is capable of 8bit transfer, then switch
768 * the device to work in 8bit transfer mode. If the
769 * mmc switch command returns error then switch to
770 * 4bit transfer mode. On success set the corresponding
771 * bus width on the host.
772 */
773 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
774 EXT_CSD_BUS_WIDTH,
775 ext_csd_bits[idx],
776 card->ext_csd.generic_cmd6_time);
777 if (err)
778 continue;
779
780 mmc_set_bus_width(card->host, bus_widths[idx]);
781
782 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
783 err = mmc_compare_ext_csds(card, bus_widths[idx]);
784 else
785 err = mmc_bus_test(card, bus_widths[idx]);
786 if (!err)
787 break;
788 }
789
790 /* switch to HS200 mode if bus width set successfully */
791 if (!err)
792 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
793 EXT_CSD_HS_TIMING, 2, 0);
794err:
795 return err;
796}
797
798/*
799 * Handle the detection and initialisation of a card.
800 *
801 * In the case of a resume, "oldcard" will contain the card
802 * we're trying to reinitialise.
803 */
804static int mmc_init_card(struct mmc_host *host, u32 ocr,
805 struct mmc_card *oldcard)
806{
807 struct mmc_card *card;
808 int err, ddr = 0;
809 u32 cid[4];
810 unsigned int max_dtr;
811 u32 rocr;
812 u8 *ext_csd = NULL;
813
814 BUG_ON(!host);
815 WARN_ON(!host->claimed);
816
817 /* Set correct bus mode for MMC before attempting init */
818 if (!mmc_host_is_spi(host))
819 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
820
821 /* Initialization should be done at 3.3 V I/O voltage. */
822 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
823
824 /*
825 * Since we're changing the OCR value, we seem to
826 * need to tell some cards to go back to the idle
827 * state. We wait 1ms to give cards time to
828 * respond.
829 * mmc_go_idle is needed for eMMC that are asleep
830 */
831 mmc_go_idle(host);
832
833 /* The extra bit indicates that we support high capacity */
834 err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
835 if (err)
836 goto err;
837
838 /*
839 * For SPI, enable CRC as appropriate.
840 */
841 if (mmc_host_is_spi(host)) {
842 err = mmc_spi_set_crc(host, use_spi_crc);
843 if (err)
844 goto err;
845 }
846
847 /*
848 * Fetch CID from card.
849 */
850 if (mmc_host_is_spi(host))
851 err = mmc_send_cid(host, cid);
852 else
853 err = mmc_all_send_cid(host, cid);
854 if (err)
855 goto err;
856
857 if (oldcard) {
858 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
859 err = -ENOENT;
860 goto err;
861 }
862
863 card = oldcard;
864 } else {
865 /*
866 * Allocate card structure.
867 */
868 card = mmc_alloc_card(host, &mmc_type);
869 if (IS_ERR(card)) {
870 err = PTR_ERR(card);
871 goto err;
872 }
873
874 card->type = MMC_TYPE_MMC;
875 card->rca = 1;
876 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
877 }
878
879 /*
880 * For native busses: set card RCA and quit open drain mode.
881 */
882 if (!mmc_host_is_spi(host)) {
883 err = mmc_set_relative_addr(card);
884 if (err)
885 goto free_card;
886
887 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
888 }
889
890 if (!oldcard) {
891 /*
892 * Fetch CSD from card.
893 */
894 err = mmc_send_csd(card, card->raw_csd);
895 if (err)
896 goto free_card;
897
898 err = mmc_decode_csd(card);
899 if (err)
900 goto free_card;
901 err = mmc_decode_cid(card);
902 if (err)
903 goto free_card;
904 }
905
906 /*
907 * Select card, as all following commands rely on that.
908 */
909 if (!mmc_host_is_spi(host)) {
910 err = mmc_select_card(card);
911 if (err)
912 goto free_card;
913 }
914
915 if (!oldcard) {
916 /*
917 * Fetch and process extended CSD.
918 */
919
920 err = mmc_get_ext_csd(card, &ext_csd);
921 if (err)
922 goto free_card;
923 err = mmc_read_ext_csd(card, ext_csd);
924 if (err)
925 goto free_card;
926
927 /* If doing byte addressing, check if required to do sector
928 * addressing. Handle the case of <2GB cards needing sector
929 * addressing. See section 8.1 JEDEC Standard JED84-A441;
930 * ocr register has bit 30 set for sector addressing.
931 */
932 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
933 mmc_card_set_blockaddr(card);
934
935 /* Erase size depends on CSD and Extended CSD */
936 mmc_set_erase_size(card);
937 }
938
939 /*
940 * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
941 * bit. This bit will be lost every time after a reset or power off.
942 */
943 if (card->ext_csd.enhanced_area_en ||
944 (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
945 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
946 EXT_CSD_ERASE_GROUP_DEF, 1,
947 card->ext_csd.generic_cmd6_time);
948
949 if (err && err != -EBADMSG)
950 goto free_card;
951
952 if (err) {
953 err = 0;
954 /*
955 * Just disable enhanced area off & sz
956 * will try to enable ERASE_GROUP_DEF
957 * during next time reinit
958 */
959 card->ext_csd.enhanced_area_offset = -EINVAL;
960 card->ext_csd.enhanced_area_size = -EINVAL;
961 } else {
962 card->ext_csd.erase_group_def = 1;
963 /*
964 * enable ERASE_GRP_DEF successfully.
965 * This will affect the erase size, so
966 * here need to reset erase size
967 */
968 mmc_set_erase_size(card);
969 }
970 }
971
972 /*
973 * Ensure eMMC user default partition is enabled
974 */
975 if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
976 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
977 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
978 card->ext_csd.part_config,
979 card->ext_csd.part_time);
980 if (err && err != -EBADMSG)
981 goto free_card;
982 }
983
984 /*
985 * If the host supports the power_off_notify capability then
986 * set the notification byte in the ext_csd register of device
987 */
988 if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) &&
989 (card->ext_csd.rev >= 6)) {
990 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
991 EXT_CSD_POWER_OFF_NOTIFICATION,
992 EXT_CSD_POWER_ON,
993 card->ext_csd.generic_cmd6_time);
994 if (err && err != -EBADMSG)
995 goto free_card;
996
997 /*
998 * The err can be -EBADMSG or 0,
999 * so check for success and update the flag
1000 */
1001 if (!err)
1002 card->poweroff_notify_state = MMC_POWERED_ON;
1003 }
1004
1005 /*
1006 * Activate high speed (if supported)
1007 */
1008 if (card->ext_csd.hs_max_dtr != 0) {
1009 err = 0;
1010 if (card->ext_csd.hs_max_dtr > 52000000 &&
1011 host->caps2 & MMC_CAP2_HS200)
1012 err = mmc_select_hs200(card);
1013 else if (host->caps & MMC_CAP_MMC_HIGHSPEED)
1014 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1015 EXT_CSD_HS_TIMING, 1,
1016 card->ext_csd.generic_cmd6_time);
1017
1018 if (err && err != -EBADMSG)
1019 goto free_card;
1020
1021 if (err) {
1022 pr_warning("%s: switch to highspeed failed\n",
1023 mmc_hostname(card->host));
1024 err = 0;
1025 } else {
1026 if (card->ext_csd.hs_max_dtr > 52000000 &&
1027 host->caps2 & MMC_CAP2_HS200) {
1028 mmc_card_set_hs200(card);
1029 mmc_set_timing(card->host,
1030 MMC_TIMING_MMC_HS200);
1031 } else {
1032 mmc_card_set_highspeed(card);
1033 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1034 }
1035 }
1036 }
1037
1038 /*
1039 * Compute bus speed.
1040 */
1041 max_dtr = (unsigned int)-1;
1042
1043 if (mmc_card_highspeed(card) || mmc_card_hs200(card)) {
1044 if (max_dtr > card->ext_csd.hs_max_dtr)
1045 max_dtr = card->ext_csd.hs_max_dtr;
1046 } else if (max_dtr > card->csd.max_dtr) {
1047 max_dtr = card->csd.max_dtr;
1048 }
1049
1050 mmc_set_clock(host, max_dtr);
1051
1052 /*
1053 * Indicate DDR mode (if supported).
1054 */
1055 if (mmc_card_highspeed(card)) {
1056 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
1057 && ((host->caps & (MMC_CAP_1_8V_DDR |
1058 MMC_CAP_UHS_DDR50))
1059 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
1060 ddr = MMC_1_8V_DDR_MODE;
1061 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
1062 && ((host->caps & (MMC_CAP_1_2V_DDR |
1063 MMC_CAP_UHS_DDR50))
1064 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
1065 ddr = MMC_1_2V_DDR_MODE;
1066 }
1067
1068 /*
1069 * Indicate HS200 SDR mode (if supported).
1070 */
1071 if (mmc_card_hs200(card)) {
1072 u32 ext_csd_bits;
1073 u32 bus_width = card->host->ios.bus_width;
1074
1075 /*
1076 * For devices supporting HS200 mode, the bus width has
1077 * to be set before executing the tuning function. If
1078 * set before tuning, then device will respond with CRC
1079 * errors for responses on CMD line. So for HS200 the
1080 * sequence will be
1081 * 1. set bus width 4bit / 8 bit (1 bit not supported)
1082 * 2. switch to HS200 mode
1083 * 3. set the clock to > 52Mhz <=200MHz and
1084 * 4. execute tuning for HS200
1085 */
1086 if ((host->caps2 & MMC_CAP2_HS200) &&
1087 card->host->ops->execute_tuning) {
1088 mmc_host_clk_hold(card->host);
1089 err = card->host->ops->execute_tuning(card->host,
1090 MMC_SEND_TUNING_BLOCK_HS200);
1091 mmc_host_clk_release(card->host);
1092 }
1093 if (err) {
1094 pr_warning("%s: tuning execution failed\n",
1095 mmc_hostname(card->host));
1096 goto err;
1097 }
1098
1099 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1100 EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4;
1101 err = mmc_select_powerclass(card, ext_csd_bits, ext_csd);
1102 if (err)
1103 pr_warning("%s: power class selection to bus width %d"
1104 " failed\n", mmc_hostname(card->host),
1105 1 << bus_width);
1106 }
1107
1108 /*
1109 * Activate wide bus and DDR (if supported).
1110 */
1111 if (!mmc_card_hs200(card) &&
1112 (card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
1113 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
1114 static unsigned ext_csd_bits[][2] = {
1115 { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
1116 { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
1117 { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
1118 };
1119 static unsigned bus_widths[] = {
1120 MMC_BUS_WIDTH_8,
1121 MMC_BUS_WIDTH_4,
1122 MMC_BUS_WIDTH_1
1123 };
1124 unsigned idx, bus_width = 0;
1125
1126 if (host->caps & MMC_CAP_8_BIT_DATA)
1127 idx = 0;
1128 else
1129 idx = 1;
1130 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
1131 bus_width = bus_widths[idx];
1132 if (bus_width == MMC_BUS_WIDTH_1)
1133 ddr = 0; /* no DDR for 1-bit width */
1134 err = mmc_select_powerclass(card, ext_csd_bits[idx][0],
1135 ext_csd);
1136 if (err)
1137 pr_warning("%s: power class selection to "
1138 "bus width %d failed\n",
1139 mmc_hostname(card->host),
1140 1 << bus_width);
1141
1142 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1143 EXT_CSD_BUS_WIDTH,
1144 ext_csd_bits[idx][0],
1145 card->ext_csd.generic_cmd6_time);
1146 if (!err) {
1147 mmc_set_bus_width(card->host, bus_width);
1148
1149 /*
1150 * If controller can't handle bus width test,
1151 * compare ext_csd previously read in 1 bit mode
1152 * against ext_csd at new bus width
1153 */
1154 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1155 err = mmc_compare_ext_csds(card,
1156 bus_width);
1157 else
1158 err = mmc_bus_test(card, bus_width);
1159 if (!err)
1160 break;
1161 }
1162 }
1163
1164 if (!err && ddr) {
1165 err = mmc_select_powerclass(card, ext_csd_bits[idx][1],
1166 ext_csd);
1167 if (err)
1168 pr_warning("%s: power class selection to "
1169 "bus width %d ddr %d failed\n",
1170 mmc_hostname(card->host),
1171 1 << bus_width, ddr);
1172
1173 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1174 EXT_CSD_BUS_WIDTH,
1175 ext_csd_bits[idx][1],
1176 card->ext_csd.generic_cmd6_time);
1177 }
1178 if (err) {
1179 pr_warning("%s: switch to bus width %d ddr %d "
1180 "failed\n", mmc_hostname(card->host),
1181 1 << bus_width, ddr);
1182 goto free_card;
1183 } else if (ddr) {
1184 /*
1185 * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1186 * signaling.
1187 *
1188 * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1189 *
1190 * 1.8V vccq at 3.3V core voltage (vcc) is not required
1191 * in the JEDEC spec for DDR.
1192 *
1193 * Do not force change in vccq since we are obviously
1194 * working and no change to vccq is needed.
1195 *
1196 * WARNING: eMMC rules are NOT the same as SD DDR
1197 */
1198 if (ddr == MMC_1_2V_DDR_MODE) {
1199 err = mmc_set_signal_voltage(host,
1200 MMC_SIGNAL_VOLTAGE_120, 0);
1201 if (err)
1202 goto err;
1203 }
1204 mmc_card_set_ddr_mode(card);
1205 mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
1206 mmc_set_bus_width(card->host, bus_width);
1207 }
1208 }
1209
1210 /*
1211 * Enable HPI feature (if supported)
1212 */
1213 if (card->ext_csd.hpi) {
1214 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1215 EXT_CSD_HPI_MGMT, 1,
1216 card->ext_csd.generic_cmd6_time);
1217 if (err && err != -EBADMSG)
1218 goto free_card;
1219 if (err) {
1220 pr_warning("%s: Enabling HPI failed\n",
1221 mmc_hostname(card->host));
1222 err = 0;
1223 } else
1224 card->ext_csd.hpi_en = 1;
1225 }
1226
1227 /*
1228 * If cache size is higher than 0, this indicates
1229 * the existence of cache and it can be turned on.
1230 */
1231 if ((host->caps2 & MMC_CAP2_CACHE_CTRL) &&
1232 card->ext_csd.cache_size > 0) {
1233 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1234 EXT_CSD_CACHE_CTRL, 1,
1235 card->ext_csd.generic_cmd6_time);
1236 if (err && err != -EBADMSG)
1237 goto free_card;
1238
1239 /*
1240 * Only if no error, cache is turned on successfully.
1241 */
1242 if (err) {
1243 pr_warning("%s: Cache is supported, "
1244 "but failed to turn on (%d)\n",
1245 mmc_hostname(card->host), err);
1246 card->ext_csd.cache_ctrl = 0;
1247 err = 0;
1248 } else {
1249 card->ext_csd.cache_ctrl = 1;
1250 }
1251 }
1252
1253 if (!oldcard)
1254 host->card = card;
1255
1256 mmc_free_ext_csd(ext_csd);
1257 return 0;
1258
1259free_card:
1260 if (!oldcard)
1261 mmc_remove_card(card);
1262err:
1263 mmc_free_ext_csd(ext_csd);
1264
1265 return err;
1266}
1267
1268/*
1269 * Host is being removed. Free up the current card.
1270 */
1271static void mmc_remove(struct mmc_host *host)
1272{
1273 BUG_ON(!host);
1274 BUG_ON(!host->card);
1275
1276 mmc_remove_card(host->card);
1277 host->card = NULL;
1278}
1279
1280/*
1281 * Card detection - card is alive.
1282 */
1283static int mmc_alive(struct mmc_host *host)
1284{
1285 return mmc_send_status(host->card, NULL);
1286}
1287
1288/*
1289 * Card detection callback from host.
1290 */
1291static void mmc_detect(struct mmc_host *host)
1292{
1293 int err;
1294
1295 BUG_ON(!host);
1296 BUG_ON(!host->card);
1297
1298 mmc_claim_host(host);
1299
1300 /*
1301 * Just check if our card has been removed.
1302 */
1303 err = _mmc_detect_card_removed(host);
1304
1305 mmc_release_host(host);
1306
1307 if (err) {
1308 mmc_remove(host);
1309
1310 mmc_claim_host(host);
1311 mmc_detach_bus(host);
1312 mmc_power_off(host);
1313 mmc_release_host(host);
1314 }
1315}
1316
1317/*
1318 * Suspend callback from host.
1319 */
1320static int mmc_suspend(struct mmc_host *host)
1321{
1322 int err = 0;
1323
1324 BUG_ON(!host);
1325 BUG_ON(!host->card);
1326
1327 mmc_claim_host(host);
1328 if (mmc_card_can_sleep(host)) {
1329 err = mmc_card_sleep(host);
1330 if (!err)
1331 mmc_card_set_sleep(host->card);
1332 } else if (!mmc_host_is_spi(host))
1333 err = mmc_deselect_cards(host);
1334 host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1335 mmc_release_host(host);
1336
1337 return err;
1338}
1339
1340/*
1341 * Resume callback from host.
1342 *
1343 * This function tries to determine if the same card is still present
1344 * and, if so, restore all state to it.
1345 */
1346static int mmc_resume(struct mmc_host *host)
1347{
1348 int err;
1349
1350 BUG_ON(!host);
1351 BUG_ON(!host->card);
1352
1353 mmc_claim_host(host);
1354 if (mmc_card_is_sleep(host->card)) {
1355 err = mmc_card_awake(host);
1356 mmc_card_clr_sleep(host->card);
1357 } else
1358 err = mmc_init_card(host, host->ocr, host->card);
1359 mmc_release_host(host);
1360
1361 return err;
1362}
1363
1364static int mmc_power_restore(struct mmc_host *host)
1365{
1366 int ret;
1367
1368 host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
1369 mmc_card_clr_sleep(host->card);
1370 mmc_claim_host(host);
1371 ret = mmc_init_card(host, host->ocr, host->card);
1372 mmc_release_host(host);
1373
1374 return ret;
1375}
1376
1377static int mmc_sleep(struct mmc_host *host)
1378{
1379 struct mmc_card *card = host->card;
1380 int err = -ENOSYS;
1381
1382 if (card && card->ext_csd.rev >= 3) {
1383 err = mmc_card_sleepawake(host, 1);
1384 if (err < 0)
1385 pr_debug("%s: Error %d while putting card into sleep",
1386 mmc_hostname(host), err);
1387 }
1388
1389 return err;
1390}
1391
1392static int mmc_awake(struct mmc_host *host)
1393{
1394 struct mmc_card *card = host->card;
1395 int err = -ENOSYS;
1396
1397 if (card && card->ext_csd.rev >= 3) {
1398 err = mmc_card_sleepawake(host, 0);
1399 if (err < 0)
1400 pr_debug("%s: Error %d while awaking sleeping card",
1401 mmc_hostname(host), err);
1402 }
1403
1404 return err;
1405}
1406
1407static const struct mmc_bus_ops mmc_ops = {
1408 .awake = mmc_awake,
1409 .sleep = mmc_sleep,
1410 .remove = mmc_remove,
1411 .detect = mmc_detect,
1412 .suspend = NULL,
1413 .resume = NULL,
1414 .power_restore = mmc_power_restore,
1415 .alive = mmc_alive,
1416};
1417
1418static const struct mmc_bus_ops mmc_ops_unsafe = {
1419 .awake = mmc_awake,
1420 .sleep = mmc_sleep,
1421 .remove = mmc_remove,
1422 .detect = mmc_detect,
1423 .suspend = mmc_suspend,
1424 .resume = mmc_resume,
1425 .power_restore = mmc_power_restore,
1426 .alive = mmc_alive,
1427};
1428
1429static void mmc_attach_bus_ops(struct mmc_host *host)
1430{
1431 const struct mmc_bus_ops *bus_ops;
1432
1433 if (!mmc_card_is_removable(host))
1434 bus_ops = &mmc_ops_unsafe;
1435 else
1436 bus_ops = &mmc_ops;
1437 mmc_attach_bus(host, bus_ops);
1438}
1439
1440/*
1441 * Starting point for MMC card init.
1442 */
1443int mmc_attach_mmc(struct mmc_host *host)
1444{
1445 int err;
1446 u32 ocr;
1447
1448 BUG_ON(!host);
1449 WARN_ON(!host->claimed);
1450
1451 /* Set correct bus mode for MMC before attempting attach */
1452 if (!mmc_host_is_spi(host))
1453 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1454
1455 err = mmc_send_op_cond(host, 0, &ocr);
1456 if (err)
1457 return err;
1458
1459 mmc_attach_bus_ops(host);
1460 if (host->ocr_avail_mmc)
1461 host->ocr_avail = host->ocr_avail_mmc;
1462
1463 /*
1464 * We need to get OCR a different way for SPI.
1465 */
1466 if (mmc_host_is_spi(host)) {
1467 err = mmc_spi_read_ocr(host, 1, &ocr);
1468 if (err)
1469 goto err;
1470 }
1471
1472 /*
1473 * Sanity check the voltages that the card claims to
1474 * support.
1475 */
1476 if (ocr & 0x7F) {
1477 pr_warning("%s: card claims to support voltages "
1478 "below the defined range. These will be ignored.\n",
1479 mmc_hostname(host));
1480 ocr &= ~0x7F;
1481 }
1482
1483 host->ocr = mmc_select_voltage(host, ocr);
1484
1485 /*
1486 * Can we support the voltage of the card?
1487 */
1488 if (!host->ocr) {
1489 err = -EINVAL;
1490 goto err;
1491 }
1492
1493 /*
1494 * Detect and init the card.
1495 */
1496 err = mmc_init_card(host, host->ocr, NULL);
1497 if (err)
1498 goto err;
1499
1500 mmc_release_host(host);
1501 err = mmc_add_card(host->card);
1502 mmc_claim_host(host);
1503 if (err)
1504 goto remove_card;
1505
1506 return 0;
1507
1508remove_card:
1509 mmc_release_host(host);
1510 mmc_remove_card(host->card);
1511 mmc_claim_host(host);
1512 host->card = NULL;
1513err:
1514 mmc_detach_bus(host);
1515
1516 pr_err("%s: error %d whilst initialising MMC card\n",
1517 mmc_hostname(host), err);
1518
1519 return err;
1520}