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Merge tag 'v4.0-rc3' into x86/build, to refresh an older tree before applying new...
[deliverable/linux.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 #include <linux/stat.h>
16 #include <linux/pm_runtime.h>
17
18 #include <linux/mmc/host.h>
19 #include <linux/mmc/card.h>
20 #include <linux/mmc/mmc.h>
21
22 #include "core.h"
23 #include "bus.h"
24 #include "mmc_ops.h"
25 #include "sd_ops.h"
26
27 static const unsigned int tran_exp[] = {
28 10000, 100000, 1000000, 10000000,
29 0, 0, 0, 0
30 };
31
32 static const unsigned char tran_mant[] = {
33 0, 10, 12, 13, 15, 20, 25, 30,
34 35, 40, 45, 50, 55, 60, 70, 80,
35 };
36
37 static const unsigned int tacc_exp[] = {
38 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
39 };
40
41 static const unsigned int tacc_mant[] = {
42 0, 10, 12, 13, 15, 20, 25, 30,
43 35, 40, 45, 50, 55, 60, 70, 80,
44 };
45
46 #define UNSTUFF_BITS(resp,start,size) \
47 ({ \
48 const int __size = size; \
49 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
50 const int __off = 3 - ((start) / 32); \
51 const int __shft = (start) & 31; \
52 u32 __res; \
53 \
54 __res = resp[__off] >> __shft; \
55 if (__size + __shft > 32) \
56 __res |= resp[__off-1] << ((32 - __shft) % 32); \
57 __res & __mask; \
58 })
59
60 /*
61 * Given the decoded CSD structure, decode the raw CID to our CID structure.
62 */
63 static int mmc_decode_cid(struct mmc_card *card)
64 {
65 u32 *resp = card->raw_cid;
66
67 /*
68 * The selection of the format here is based upon published
69 * specs from sandisk and from what people have reported.
70 */
71 switch (card->csd.mmca_vsn) {
72 case 0: /* MMC v1.0 - v1.2 */
73 case 1: /* MMC v1.4 */
74 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
75 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
76 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
77 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
78 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
79 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
80 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
81 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
82 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
83 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
84 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
85 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
86 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
87 break;
88
89 case 2: /* MMC v2.0 - v2.2 */
90 case 3: /* MMC v3.1 - v3.3 */
91 case 4: /* MMC v4 */
92 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
93 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
94 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
95 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
96 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
97 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
98 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
99 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
100 card->cid.prv = UNSTUFF_BITS(resp, 48, 8);
101 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
102 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
103 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
104 break;
105
106 default:
107 pr_err("%s: card has unknown MMCA version %d\n",
108 mmc_hostname(card->host), card->csd.mmca_vsn);
109 return -EINVAL;
110 }
111
112 return 0;
113 }
114
115 static void mmc_set_erase_size(struct mmc_card *card)
116 {
117 if (card->ext_csd.erase_group_def & 1)
118 card->erase_size = card->ext_csd.hc_erase_size;
119 else
120 card->erase_size = card->csd.erase_size;
121
122 mmc_init_erase(card);
123 }
124
125 /*
126 * Given a 128-bit response, decode to our card CSD structure.
127 */
128 static int mmc_decode_csd(struct mmc_card *card)
129 {
130 struct mmc_csd *csd = &card->csd;
131 unsigned int e, m, a, b;
132 u32 *resp = card->raw_csd;
133
134 /*
135 * We only understand CSD structure v1.1 and v1.2.
136 * v1.2 has extra information in bits 15, 11 and 10.
137 * We also support eMMC v4.4 & v4.41.
138 */
139 csd->structure = UNSTUFF_BITS(resp, 126, 2);
140 if (csd->structure == 0) {
141 pr_err("%s: unrecognised CSD structure version %d\n",
142 mmc_hostname(card->host), csd->structure);
143 return -EINVAL;
144 }
145
146 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
147 m = UNSTUFF_BITS(resp, 115, 4);
148 e = UNSTUFF_BITS(resp, 112, 3);
149 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
150 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
151
152 m = UNSTUFF_BITS(resp, 99, 4);
153 e = UNSTUFF_BITS(resp, 96, 3);
154 csd->max_dtr = tran_exp[e] * tran_mant[m];
155 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
156
157 e = UNSTUFF_BITS(resp, 47, 3);
158 m = UNSTUFF_BITS(resp, 62, 12);
159 csd->capacity = (1 + m) << (e + 2);
160
161 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
162 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
163 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
164 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
165 csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
166 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
167 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
168 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
169
170 if (csd->write_blkbits >= 9) {
171 a = UNSTUFF_BITS(resp, 42, 5);
172 b = UNSTUFF_BITS(resp, 37, 5);
173 csd->erase_size = (a + 1) * (b + 1);
174 csd->erase_size <<= csd->write_blkbits - 9;
175 }
176
177 return 0;
178 }
179
180 static void mmc_select_card_type(struct mmc_card *card)
181 {
182 struct mmc_host *host = card->host;
183 u8 card_type = card->ext_csd.raw_card_type;
184 u32 caps = host->caps, caps2 = host->caps2;
185 unsigned int hs_max_dtr = 0, hs200_max_dtr = 0;
186 unsigned int avail_type = 0;
187
188 if (caps & MMC_CAP_MMC_HIGHSPEED &&
189 card_type & EXT_CSD_CARD_TYPE_HS_26) {
190 hs_max_dtr = MMC_HIGH_26_MAX_DTR;
191 avail_type |= EXT_CSD_CARD_TYPE_HS_26;
192 }
193
194 if (caps & MMC_CAP_MMC_HIGHSPEED &&
195 card_type & EXT_CSD_CARD_TYPE_HS_52) {
196 hs_max_dtr = MMC_HIGH_52_MAX_DTR;
197 avail_type |= EXT_CSD_CARD_TYPE_HS_52;
198 }
199
200 if (caps & MMC_CAP_1_8V_DDR &&
201 card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) {
202 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
203 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_8V;
204 }
205
206 if (caps & MMC_CAP_1_2V_DDR &&
207 card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
208 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
209 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_2V;
210 }
211
212 if (caps2 & MMC_CAP2_HS200_1_8V_SDR &&
213 card_type & EXT_CSD_CARD_TYPE_HS200_1_8V) {
214 hs200_max_dtr = MMC_HS200_MAX_DTR;
215 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_8V;
216 }
217
218 if (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
219 card_type & EXT_CSD_CARD_TYPE_HS200_1_2V) {
220 hs200_max_dtr = MMC_HS200_MAX_DTR;
221 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_2V;
222 }
223
224 if (caps2 & MMC_CAP2_HS400_1_8V &&
225 card_type & EXT_CSD_CARD_TYPE_HS400_1_8V) {
226 hs200_max_dtr = MMC_HS200_MAX_DTR;
227 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_8V;
228 }
229
230 if (caps2 & MMC_CAP2_HS400_1_2V &&
231 card_type & EXT_CSD_CARD_TYPE_HS400_1_2V) {
232 hs200_max_dtr = MMC_HS200_MAX_DTR;
233 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_2V;
234 }
235
236 card->ext_csd.hs_max_dtr = hs_max_dtr;
237 card->ext_csd.hs200_max_dtr = hs200_max_dtr;
238 card->mmc_avail_type = avail_type;
239 }
240
241 static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd)
242 {
243 u8 hc_erase_grp_sz, hc_wp_grp_sz;
244
245 /*
246 * Disable these attributes by default
247 */
248 card->ext_csd.enhanced_area_offset = -EINVAL;
249 card->ext_csd.enhanced_area_size = -EINVAL;
250
251 /*
252 * Enhanced area feature support -- check whether the eMMC
253 * card has the Enhanced area enabled. If so, export enhanced
254 * area offset and size to user by adding sysfs interface.
255 */
256 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
257 (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
258 if (card->ext_csd.partition_setting_completed) {
259 hc_erase_grp_sz =
260 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
261 hc_wp_grp_sz =
262 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
263
264 /*
265 * calculate the enhanced data area offset, in bytes
266 */
267 card->ext_csd.enhanced_area_offset =
268 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
269 (ext_csd[137] << 8) + ext_csd[136];
270 if (mmc_card_blockaddr(card))
271 card->ext_csd.enhanced_area_offset <<= 9;
272 /*
273 * calculate the enhanced data area size, in kilobytes
274 */
275 card->ext_csd.enhanced_area_size =
276 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
277 ext_csd[140];
278 card->ext_csd.enhanced_area_size *=
279 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
280 card->ext_csd.enhanced_area_size <<= 9;
281 } else {
282 pr_warn("%s: defines enhanced area without partition setting complete\n",
283 mmc_hostname(card->host));
284 }
285 }
286 }
287
288 static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd)
289 {
290 int idx;
291 u8 hc_erase_grp_sz, hc_wp_grp_sz;
292 unsigned int part_size;
293
294 /*
295 * General purpose partition feature support --
296 * If ext_csd has the size of general purpose partitions,
297 * set size, part_cfg, partition name in mmc_part.
298 */
299 if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
300 EXT_CSD_PART_SUPPORT_PART_EN) {
301 hc_erase_grp_sz =
302 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
303 hc_wp_grp_sz =
304 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
305
306 for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
307 if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
308 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
309 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
310 continue;
311 if (card->ext_csd.partition_setting_completed == 0) {
312 pr_warn("%s: has partition size defined without partition complete\n",
313 mmc_hostname(card->host));
314 break;
315 }
316 part_size =
317 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
318 << 16) +
319 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
320 << 8) +
321 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
322 part_size *= (size_t)(hc_erase_grp_sz *
323 hc_wp_grp_sz);
324 mmc_part_add(card, part_size << 19,
325 EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
326 "gp%d", idx, false,
327 MMC_BLK_DATA_AREA_GP);
328 }
329 }
330 }
331
332 /*
333 * Decode extended CSD.
334 */
335 static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
336 {
337 int err = 0, idx;
338 unsigned int part_size;
339
340 /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
341 card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
342 if (card->csd.structure == 3) {
343 if (card->ext_csd.raw_ext_csd_structure > 2) {
344 pr_err("%s: unrecognised EXT_CSD structure "
345 "version %d\n", mmc_hostname(card->host),
346 card->ext_csd.raw_ext_csd_structure);
347 err = -EINVAL;
348 goto out;
349 }
350 }
351
352 /*
353 * The EXT_CSD format is meant to be forward compatible. As long
354 * as CSD_STRUCTURE does not change, all values for EXT_CSD_REV
355 * are authorized, see JEDEC JESD84-B50 section B.8.
356 */
357 card->ext_csd.rev = ext_csd[EXT_CSD_REV];
358
359 card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
360 card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
361 card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
362 card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
363 if (card->ext_csd.rev >= 2) {
364 card->ext_csd.sectors =
365 ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
366 ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
367 ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
368 ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
369
370 /* Cards with density > 2GiB are sector addressed */
371 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
372 mmc_card_set_blockaddr(card);
373 }
374
375 card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
376 mmc_select_card_type(card);
377
378 card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
379 card->ext_csd.raw_erase_timeout_mult =
380 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
381 card->ext_csd.raw_hc_erase_grp_size =
382 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
383 if (card->ext_csd.rev >= 3) {
384 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
385 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
386
387 /* EXT_CSD value is in units of 10ms, but we store in ms */
388 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
389
390 /* Sleep / awake timeout in 100ns units */
391 if (sa_shift > 0 && sa_shift <= 0x17)
392 card->ext_csd.sa_timeout =
393 1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
394 card->ext_csd.erase_group_def =
395 ext_csd[EXT_CSD_ERASE_GROUP_DEF];
396 card->ext_csd.hc_erase_timeout = 300 *
397 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
398 card->ext_csd.hc_erase_size =
399 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
400
401 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
402
403 /*
404 * There are two boot regions of equal size, defined in
405 * multiples of 128K.
406 */
407 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
408 for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
409 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
410 mmc_part_add(card, part_size,
411 EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
412 "boot%d", idx, true,
413 MMC_BLK_DATA_AREA_BOOT);
414 }
415 }
416 }
417
418 card->ext_csd.raw_hc_erase_gap_size =
419 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
420 card->ext_csd.raw_sec_trim_mult =
421 ext_csd[EXT_CSD_SEC_TRIM_MULT];
422 card->ext_csd.raw_sec_erase_mult =
423 ext_csd[EXT_CSD_SEC_ERASE_MULT];
424 card->ext_csd.raw_sec_feature_support =
425 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
426 card->ext_csd.raw_trim_mult =
427 ext_csd[EXT_CSD_TRIM_MULT];
428 card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
429 if (card->ext_csd.rev >= 4) {
430 if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED] &
431 EXT_CSD_PART_SETTING_COMPLETED)
432 card->ext_csd.partition_setting_completed = 1;
433 else
434 card->ext_csd.partition_setting_completed = 0;
435
436 mmc_manage_enhanced_area(card, ext_csd);
437
438 mmc_manage_gp_partitions(card, ext_csd);
439
440 card->ext_csd.sec_trim_mult =
441 ext_csd[EXT_CSD_SEC_TRIM_MULT];
442 card->ext_csd.sec_erase_mult =
443 ext_csd[EXT_CSD_SEC_ERASE_MULT];
444 card->ext_csd.sec_feature_support =
445 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
446 card->ext_csd.trim_timeout = 300 *
447 ext_csd[EXT_CSD_TRIM_MULT];
448
449 /*
450 * Note that the call to mmc_part_add above defaults to read
451 * only. If this default assumption is changed, the call must
452 * take into account the value of boot_locked below.
453 */
454 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
455 card->ext_csd.boot_ro_lockable = true;
456
457 /* Save power class values */
458 card->ext_csd.raw_pwr_cl_52_195 =
459 ext_csd[EXT_CSD_PWR_CL_52_195];
460 card->ext_csd.raw_pwr_cl_26_195 =
461 ext_csd[EXT_CSD_PWR_CL_26_195];
462 card->ext_csd.raw_pwr_cl_52_360 =
463 ext_csd[EXT_CSD_PWR_CL_52_360];
464 card->ext_csd.raw_pwr_cl_26_360 =
465 ext_csd[EXT_CSD_PWR_CL_26_360];
466 card->ext_csd.raw_pwr_cl_200_195 =
467 ext_csd[EXT_CSD_PWR_CL_200_195];
468 card->ext_csd.raw_pwr_cl_200_360 =
469 ext_csd[EXT_CSD_PWR_CL_200_360];
470 card->ext_csd.raw_pwr_cl_ddr_52_195 =
471 ext_csd[EXT_CSD_PWR_CL_DDR_52_195];
472 card->ext_csd.raw_pwr_cl_ddr_52_360 =
473 ext_csd[EXT_CSD_PWR_CL_DDR_52_360];
474 card->ext_csd.raw_pwr_cl_ddr_200_360 =
475 ext_csd[EXT_CSD_PWR_CL_DDR_200_360];
476 }
477
478 if (card->ext_csd.rev >= 5) {
479 /* Adjust production date as per JEDEC JESD84-B451 */
480 if (card->cid.year < 2010)
481 card->cid.year += 16;
482
483 /* check whether the eMMC card supports BKOPS */
484 if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
485 card->ext_csd.bkops = 1;
486 card->ext_csd.man_bkops_en =
487 (ext_csd[EXT_CSD_BKOPS_EN] &
488 EXT_CSD_MANUAL_BKOPS_MASK);
489 card->ext_csd.raw_bkops_status =
490 ext_csd[EXT_CSD_BKOPS_STATUS];
491 if (!card->ext_csd.man_bkops_en)
492 pr_info("%s: MAN_BKOPS_EN bit is not set\n",
493 mmc_hostname(card->host));
494 }
495
496 /* check whether the eMMC card supports HPI */
497 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) {
498 card->ext_csd.hpi = 1;
499 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
500 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
501 else
502 card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
503 /*
504 * Indicate the maximum timeout to close
505 * a command interrupted by HPI
506 */
507 card->ext_csd.out_of_int_time =
508 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
509 }
510
511 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
512 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
513
514 /*
515 * RPMB regions are defined in multiples of 128K.
516 */
517 card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
518 if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) {
519 mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
520 EXT_CSD_PART_CONFIG_ACC_RPMB,
521 "rpmb", 0, false,
522 MMC_BLK_DATA_AREA_RPMB);
523 }
524 }
525
526 card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
527 if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
528 card->erased_byte = 0xFF;
529 else
530 card->erased_byte = 0x0;
531
532 /* eMMC v4.5 or later */
533 if (card->ext_csd.rev >= 6) {
534 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
535
536 card->ext_csd.generic_cmd6_time = 10 *
537 ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
538 card->ext_csd.power_off_longtime = 10 *
539 ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
540
541 card->ext_csd.cache_size =
542 ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
543 ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
544 ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
545 ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
546
547 if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
548 card->ext_csd.data_sector_size = 4096;
549 else
550 card->ext_csd.data_sector_size = 512;
551
552 if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
553 (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
554 card->ext_csd.data_tag_unit_size =
555 ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
556 (card->ext_csd.data_sector_size);
557 } else {
558 card->ext_csd.data_tag_unit_size = 0;
559 }
560
561 card->ext_csd.max_packed_writes =
562 ext_csd[EXT_CSD_MAX_PACKED_WRITES];
563 card->ext_csd.max_packed_reads =
564 ext_csd[EXT_CSD_MAX_PACKED_READS];
565 } else {
566 card->ext_csd.data_sector_size = 512;
567 }
568
569 /* eMMC v5 or later */
570 if (card->ext_csd.rev >= 7) {
571 memcpy(card->ext_csd.fwrev, &ext_csd[EXT_CSD_FIRMWARE_VERSION],
572 MMC_FIRMWARE_LEN);
573 card->ext_csd.ffu_capable =
574 (ext_csd[EXT_CSD_SUPPORTED_MODE] & 0x1) &&
575 !(ext_csd[EXT_CSD_FW_CONFIG] & 0x1);
576 }
577 out:
578 return err;
579 }
580
581 static int mmc_read_ext_csd(struct mmc_card *card)
582 {
583 u8 *ext_csd;
584 int err;
585
586 if (!mmc_can_ext_csd(card))
587 return 0;
588
589 err = mmc_get_ext_csd(card, &ext_csd);
590 if (err) {
591 /* If the host or the card can't do the switch,
592 * fail more gracefully. */
593 if ((err != -EINVAL)
594 && (err != -ENOSYS)
595 && (err != -EFAULT))
596 return err;
597
598 /*
599 * High capacity cards should have this "magic" size
600 * stored in their CSD.
601 */
602 if (card->csd.capacity == (4096 * 512)) {
603 pr_err("%s: unable to read EXT_CSD on a possible high capacity card. Card will be ignored.\n",
604 mmc_hostname(card->host));
605 } else {
606 pr_warn("%s: unable to read EXT_CSD, performance might suffer\n",
607 mmc_hostname(card->host));
608 err = 0;
609 }
610
611 return err;
612 }
613
614 err = mmc_decode_ext_csd(card, ext_csd);
615 kfree(ext_csd);
616 return err;
617 }
618
619 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
620 {
621 u8 *bw_ext_csd;
622 int err;
623
624 if (bus_width == MMC_BUS_WIDTH_1)
625 return 0;
626
627 err = mmc_get_ext_csd(card, &bw_ext_csd);
628 if (err)
629 return err;
630
631 /* only compare read only fields */
632 err = !((card->ext_csd.raw_partition_support ==
633 bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
634 (card->ext_csd.raw_erased_mem_count ==
635 bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
636 (card->ext_csd.rev ==
637 bw_ext_csd[EXT_CSD_REV]) &&
638 (card->ext_csd.raw_ext_csd_structure ==
639 bw_ext_csd[EXT_CSD_STRUCTURE]) &&
640 (card->ext_csd.raw_card_type ==
641 bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
642 (card->ext_csd.raw_s_a_timeout ==
643 bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
644 (card->ext_csd.raw_hc_erase_gap_size ==
645 bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
646 (card->ext_csd.raw_erase_timeout_mult ==
647 bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
648 (card->ext_csd.raw_hc_erase_grp_size ==
649 bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
650 (card->ext_csd.raw_sec_trim_mult ==
651 bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
652 (card->ext_csd.raw_sec_erase_mult ==
653 bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
654 (card->ext_csd.raw_sec_feature_support ==
655 bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
656 (card->ext_csd.raw_trim_mult ==
657 bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
658 (card->ext_csd.raw_sectors[0] ==
659 bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
660 (card->ext_csd.raw_sectors[1] ==
661 bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
662 (card->ext_csd.raw_sectors[2] ==
663 bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
664 (card->ext_csd.raw_sectors[3] ==
665 bw_ext_csd[EXT_CSD_SEC_CNT + 3]) &&
666 (card->ext_csd.raw_pwr_cl_52_195 ==
667 bw_ext_csd[EXT_CSD_PWR_CL_52_195]) &&
668 (card->ext_csd.raw_pwr_cl_26_195 ==
669 bw_ext_csd[EXT_CSD_PWR_CL_26_195]) &&
670 (card->ext_csd.raw_pwr_cl_52_360 ==
671 bw_ext_csd[EXT_CSD_PWR_CL_52_360]) &&
672 (card->ext_csd.raw_pwr_cl_26_360 ==
673 bw_ext_csd[EXT_CSD_PWR_CL_26_360]) &&
674 (card->ext_csd.raw_pwr_cl_200_195 ==
675 bw_ext_csd[EXT_CSD_PWR_CL_200_195]) &&
676 (card->ext_csd.raw_pwr_cl_200_360 ==
677 bw_ext_csd[EXT_CSD_PWR_CL_200_360]) &&
678 (card->ext_csd.raw_pwr_cl_ddr_52_195 ==
679 bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_195]) &&
680 (card->ext_csd.raw_pwr_cl_ddr_52_360 ==
681 bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]) &&
682 (card->ext_csd.raw_pwr_cl_ddr_200_360 ==
683 bw_ext_csd[EXT_CSD_PWR_CL_DDR_200_360]));
684
685 if (err)
686 err = -EINVAL;
687
688 kfree(bw_ext_csd);
689 return err;
690 }
691
692 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
693 card->raw_cid[2], card->raw_cid[3]);
694 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
695 card->raw_csd[2], card->raw_csd[3]);
696 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
697 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
698 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
699 MMC_DEV_ATTR(ffu_capable, "%d\n", card->ext_csd.ffu_capable);
700 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
701 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
702 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
703 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
704 MMC_DEV_ATTR(prv, "0x%x\n", card->cid.prv);
705 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
706 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
707 card->ext_csd.enhanced_area_offset);
708 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
709 MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
710 MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
711
712 static ssize_t mmc_fwrev_show(struct device *dev,
713 struct device_attribute *attr,
714 char *buf)
715 {
716 struct mmc_card *card = mmc_dev_to_card(dev);
717
718 if (card->ext_csd.rev < 7) {
719 return sprintf(buf, "0x%x\n", card->cid.fwrev);
720 } else {
721 return sprintf(buf, "0x%*phN\n", MMC_FIRMWARE_LEN,
722 card->ext_csd.fwrev);
723 }
724 }
725
726 static DEVICE_ATTR(fwrev, S_IRUGO, mmc_fwrev_show, NULL);
727
728 static struct attribute *mmc_std_attrs[] = {
729 &dev_attr_cid.attr,
730 &dev_attr_csd.attr,
731 &dev_attr_date.attr,
732 &dev_attr_erase_size.attr,
733 &dev_attr_preferred_erase_size.attr,
734 &dev_attr_fwrev.attr,
735 &dev_attr_ffu_capable.attr,
736 &dev_attr_hwrev.attr,
737 &dev_attr_manfid.attr,
738 &dev_attr_name.attr,
739 &dev_attr_oemid.attr,
740 &dev_attr_prv.attr,
741 &dev_attr_serial.attr,
742 &dev_attr_enhanced_area_offset.attr,
743 &dev_attr_enhanced_area_size.attr,
744 &dev_attr_raw_rpmb_size_mult.attr,
745 &dev_attr_rel_sectors.attr,
746 NULL,
747 };
748 ATTRIBUTE_GROUPS(mmc_std);
749
750 static struct device_type mmc_type = {
751 .groups = mmc_std_groups,
752 };
753
754 /*
755 * Select the PowerClass for the current bus width
756 * If power class is defined for 4/8 bit bus in the
757 * extended CSD register, select it by executing the
758 * mmc_switch command.
759 */
760 static int __mmc_select_powerclass(struct mmc_card *card,
761 unsigned int bus_width)
762 {
763 struct mmc_host *host = card->host;
764 struct mmc_ext_csd *ext_csd = &card->ext_csd;
765 unsigned int pwrclass_val = 0;
766 int err = 0;
767
768 switch (1 << host->ios.vdd) {
769 case MMC_VDD_165_195:
770 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
771 pwrclass_val = ext_csd->raw_pwr_cl_26_195;
772 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
773 pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
774 ext_csd->raw_pwr_cl_52_195 :
775 ext_csd->raw_pwr_cl_ddr_52_195;
776 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
777 pwrclass_val = ext_csd->raw_pwr_cl_200_195;
778 break;
779 case MMC_VDD_27_28:
780 case MMC_VDD_28_29:
781 case MMC_VDD_29_30:
782 case MMC_VDD_30_31:
783 case MMC_VDD_31_32:
784 case MMC_VDD_32_33:
785 case MMC_VDD_33_34:
786 case MMC_VDD_34_35:
787 case MMC_VDD_35_36:
788 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
789 pwrclass_val = ext_csd->raw_pwr_cl_26_360;
790 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
791 pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
792 ext_csd->raw_pwr_cl_52_360 :
793 ext_csd->raw_pwr_cl_ddr_52_360;
794 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
795 pwrclass_val = (bus_width == EXT_CSD_DDR_BUS_WIDTH_8) ?
796 ext_csd->raw_pwr_cl_ddr_200_360 :
797 ext_csd->raw_pwr_cl_200_360;
798 break;
799 default:
800 pr_warn("%s: Voltage range not supported for power class\n",
801 mmc_hostname(host));
802 return -EINVAL;
803 }
804
805 if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
806 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
807 EXT_CSD_PWR_CL_8BIT_SHIFT;
808 else
809 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
810 EXT_CSD_PWR_CL_4BIT_SHIFT;
811
812 /* If the power class is different from the default value */
813 if (pwrclass_val > 0) {
814 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
815 EXT_CSD_POWER_CLASS,
816 pwrclass_val,
817 card->ext_csd.generic_cmd6_time);
818 }
819
820 return err;
821 }
822
823 static int mmc_select_powerclass(struct mmc_card *card)
824 {
825 struct mmc_host *host = card->host;
826 u32 bus_width, ext_csd_bits;
827 int err, ddr;
828
829 /* Power class selection is supported for versions >= 4.0 */
830 if (!mmc_can_ext_csd(card))
831 return 0;
832
833 bus_width = host->ios.bus_width;
834 /* Power class values are defined only for 4/8 bit bus */
835 if (bus_width == MMC_BUS_WIDTH_1)
836 return 0;
837
838 ddr = card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52;
839 if (ddr)
840 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
841 EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
842 else
843 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
844 EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4;
845
846 err = __mmc_select_powerclass(card, ext_csd_bits);
847 if (err)
848 pr_warn("%s: power class selection to bus width %d ddr %d failed\n",
849 mmc_hostname(host), 1 << bus_width, ddr);
850
851 return err;
852 }
853
854 /*
855 * Set the bus speed for the selected speed mode.
856 */
857 static void mmc_set_bus_speed(struct mmc_card *card)
858 {
859 unsigned int max_dtr = (unsigned int)-1;
860
861 if ((mmc_card_hs200(card) || mmc_card_hs400(card)) &&
862 max_dtr > card->ext_csd.hs200_max_dtr)
863 max_dtr = card->ext_csd.hs200_max_dtr;
864 else if (mmc_card_hs(card) && max_dtr > card->ext_csd.hs_max_dtr)
865 max_dtr = card->ext_csd.hs_max_dtr;
866 else if (max_dtr > card->csd.max_dtr)
867 max_dtr = card->csd.max_dtr;
868
869 mmc_set_clock(card->host, max_dtr);
870 }
871
872 /*
873 * Select the bus width amoung 4-bit and 8-bit(SDR).
874 * If the bus width is changed successfully, return the selected width value.
875 * Zero is returned instead of error value if the wide width is not supported.
876 */
877 static int mmc_select_bus_width(struct mmc_card *card)
878 {
879 static unsigned ext_csd_bits[] = {
880 EXT_CSD_BUS_WIDTH_8,
881 EXT_CSD_BUS_WIDTH_4,
882 };
883 static unsigned bus_widths[] = {
884 MMC_BUS_WIDTH_8,
885 MMC_BUS_WIDTH_4,
886 };
887 struct mmc_host *host = card->host;
888 unsigned idx, bus_width = 0;
889 int err = 0;
890
891 if (!mmc_can_ext_csd(card) ||
892 !(host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)))
893 return 0;
894
895 idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 0 : 1;
896
897 /*
898 * Unlike SD, MMC cards dont have a configuration register to notify
899 * supported bus width. So bus test command should be run to identify
900 * the supported bus width or compare the ext csd values of current
901 * bus width and ext csd values of 1 bit mode read earlier.
902 */
903 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
904 /*
905 * Host is capable of 8bit transfer, then switch
906 * the device to work in 8bit transfer mode. If the
907 * mmc switch command returns error then switch to
908 * 4bit transfer mode. On success set the corresponding
909 * bus width on the host.
910 */
911 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
912 EXT_CSD_BUS_WIDTH,
913 ext_csd_bits[idx],
914 card->ext_csd.generic_cmd6_time);
915 if (err)
916 continue;
917
918 bus_width = bus_widths[idx];
919 mmc_set_bus_width(host, bus_width);
920
921 /*
922 * If controller can't handle bus width test,
923 * compare ext_csd previously read in 1 bit mode
924 * against ext_csd at new bus width
925 */
926 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
927 err = mmc_compare_ext_csds(card, bus_width);
928 else
929 err = mmc_bus_test(card, bus_width);
930
931 if (!err) {
932 err = bus_width;
933 break;
934 } else {
935 pr_warn("%s: switch to bus width %d failed\n",
936 mmc_hostname(host), ext_csd_bits[idx]);
937 }
938 }
939
940 return err;
941 }
942
943 /*
944 * Switch to the high-speed mode
945 */
946 static int mmc_select_hs(struct mmc_card *card)
947 {
948 int err;
949
950 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
951 EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
952 card->ext_csd.generic_cmd6_time,
953 true, true, true);
954 if (!err)
955 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
956
957 return err;
958 }
959
960 /*
961 * Activate wide bus and DDR if supported.
962 */
963 static int mmc_select_hs_ddr(struct mmc_card *card)
964 {
965 struct mmc_host *host = card->host;
966 u32 bus_width, ext_csd_bits;
967 int err = 0;
968
969 if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52))
970 return 0;
971
972 bus_width = host->ios.bus_width;
973 if (bus_width == MMC_BUS_WIDTH_1)
974 return 0;
975
976 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
977 EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
978
979 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
980 EXT_CSD_BUS_WIDTH,
981 ext_csd_bits,
982 card->ext_csd.generic_cmd6_time);
983 if (err) {
984 pr_err("%s: switch to bus width %d ddr failed\n",
985 mmc_hostname(host), 1 << bus_width);
986 return err;
987 }
988
989 /*
990 * eMMC cards can support 3.3V to 1.2V i/o (vccq)
991 * signaling.
992 *
993 * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
994 *
995 * 1.8V vccq at 3.3V core voltage (vcc) is not required
996 * in the JEDEC spec for DDR.
997 *
998 * Even (e)MMC card can support 3.3v to 1.2v vccq, but not all
999 * host controller can support this, like some of the SDHCI
1000 * controller which connect to an eMMC device. Some of these
1001 * host controller still needs to use 1.8v vccq for supporting
1002 * DDR mode.
1003 *
1004 * So the sequence will be:
1005 * if (host and device can both support 1.2v IO)
1006 * use 1.2v IO;
1007 * else if (host and device can both support 1.8v IO)
1008 * use 1.8v IO;
1009 * so if host and device can only support 3.3v IO, this is the
1010 * last choice.
1011 *
1012 * WARNING: eMMC rules are NOT the same as SD DDR
1013 */
1014 err = -EINVAL;
1015 if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
1016 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1017
1018 if (err && (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_8V))
1019 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1020
1021 /* make sure vccq is 3.3v after switching disaster */
1022 if (err)
1023 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
1024
1025 if (!err)
1026 mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
1027
1028 return err;
1029 }
1030
1031 static int mmc_select_hs400(struct mmc_card *card)
1032 {
1033 struct mmc_host *host = card->host;
1034 int err = 0;
1035
1036 /*
1037 * HS400 mode requires 8-bit bus width
1038 */
1039 if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1040 host->ios.bus_width == MMC_BUS_WIDTH_8))
1041 return 0;
1042
1043 /*
1044 * Before switching to dual data rate operation for HS400,
1045 * it is required to convert from HS200 mode to HS mode.
1046 */
1047 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1048 mmc_set_bus_speed(card);
1049
1050 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1051 EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
1052 card->ext_csd.generic_cmd6_time,
1053 true, true, true);
1054 if (err) {
1055 pr_err("%s: switch to high-speed from hs200 failed, err:%d\n",
1056 mmc_hostname(host), err);
1057 return err;
1058 }
1059
1060 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1061 EXT_CSD_BUS_WIDTH,
1062 EXT_CSD_DDR_BUS_WIDTH_8,
1063 card->ext_csd.generic_cmd6_time);
1064 if (err) {
1065 pr_err("%s: switch to bus width for hs400 failed, err:%d\n",
1066 mmc_hostname(host), err);
1067 return err;
1068 }
1069
1070 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1071 EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS400,
1072 card->ext_csd.generic_cmd6_time,
1073 true, true, true);
1074 if (err) {
1075 pr_err("%s: switch to hs400 failed, err:%d\n",
1076 mmc_hostname(host), err);
1077 return err;
1078 }
1079
1080 mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1081 mmc_set_bus_speed(card);
1082
1083 return 0;
1084 }
1085
1086 /*
1087 * For device supporting HS200 mode, the following sequence
1088 * should be done before executing the tuning process.
1089 * 1. set the desired bus width(4-bit or 8-bit, 1-bit is not supported)
1090 * 2. switch to HS200 mode
1091 * 3. set the clock to > 52Mhz and <=200MHz
1092 */
1093 static int mmc_select_hs200(struct mmc_card *card)
1094 {
1095 struct mmc_host *host = card->host;
1096 int err = -EINVAL;
1097
1098 if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
1099 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1100
1101 if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
1102 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1103
1104 /* If fails try again during next card power cycle */
1105 if (err)
1106 goto err;
1107
1108 /*
1109 * Set the bus width(4 or 8) with host's support and
1110 * switch to HS200 mode if bus width is set successfully.
1111 */
1112 err = mmc_select_bus_width(card);
1113 if (!IS_ERR_VALUE(err)) {
1114 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1115 EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS200,
1116 card->ext_csd.generic_cmd6_time,
1117 true, true, true);
1118 if (!err)
1119 mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1120 }
1121 err:
1122 return err;
1123 }
1124
1125 /*
1126 * Activate High Speed or HS200 mode if supported.
1127 */
1128 static int mmc_select_timing(struct mmc_card *card)
1129 {
1130 int err = 0;
1131
1132 if (!mmc_can_ext_csd(card))
1133 goto bus_speed;
1134
1135 if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
1136 err = mmc_select_hs200(card);
1137 else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
1138 err = mmc_select_hs(card);
1139
1140 if (err && err != -EBADMSG)
1141 return err;
1142
1143 if (err) {
1144 pr_warn("%s: switch to %s failed\n",
1145 mmc_card_hs(card) ? "high-speed" :
1146 (mmc_card_hs200(card) ? "hs200" : ""),
1147 mmc_hostname(card->host));
1148 err = 0;
1149 }
1150
1151 bus_speed:
1152 /*
1153 * Set the bus speed to the selected bus timing.
1154 * If timing is not selected, backward compatible is the default.
1155 */
1156 mmc_set_bus_speed(card);
1157 return err;
1158 }
1159
1160 /*
1161 * Execute tuning sequence to seek the proper bus operating
1162 * conditions for HS200 and HS400, which sends CMD21 to the device.
1163 */
1164 static int mmc_hs200_tuning(struct mmc_card *card)
1165 {
1166 struct mmc_host *host = card->host;
1167
1168 /*
1169 * Timing should be adjusted to the HS400 target
1170 * operation frequency for tuning process
1171 */
1172 if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1173 host->ios.bus_width == MMC_BUS_WIDTH_8)
1174 if (host->ops->prepare_hs400_tuning)
1175 host->ops->prepare_hs400_tuning(host, &host->ios);
1176
1177 return mmc_execute_tuning(card);
1178 }
1179
1180 /*
1181 * Handle the detection and initialisation of a card.
1182 *
1183 * In the case of a resume, "oldcard" will contain the card
1184 * we're trying to reinitialise.
1185 */
1186 static int mmc_init_card(struct mmc_host *host, u32 ocr,
1187 struct mmc_card *oldcard)
1188 {
1189 struct mmc_card *card;
1190 int err;
1191 u32 cid[4];
1192 u32 rocr;
1193
1194 BUG_ON(!host);
1195 WARN_ON(!host->claimed);
1196
1197 /* Set correct bus mode for MMC before attempting init */
1198 if (!mmc_host_is_spi(host))
1199 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1200
1201 /*
1202 * Since we're changing the OCR value, we seem to
1203 * need to tell some cards to go back to the idle
1204 * state. We wait 1ms to give cards time to
1205 * respond.
1206 * mmc_go_idle is needed for eMMC that are asleep
1207 */
1208 mmc_go_idle(host);
1209
1210 /* The extra bit indicates that we support high capacity */
1211 err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
1212 if (err)
1213 goto err;
1214
1215 /*
1216 * For SPI, enable CRC as appropriate.
1217 */
1218 if (mmc_host_is_spi(host)) {
1219 err = mmc_spi_set_crc(host, use_spi_crc);
1220 if (err)
1221 goto err;
1222 }
1223
1224 /*
1225 * Fetch CID from card.
1226 */
1227 if (mmc_host_is_spi(host))
1228 err = mmc_send_cid(host, cid);
1229 else
1230 err = mmc_all_send_cid(host, cid);
1231 if (err)
1232 goto err;
1233
1234 if (oldcard) {
1235 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
1236 err = -ENOENT;
1237 goto err;
1238 }
1239
1240 card = oldcard;
1241 } else {
1242 /*
1243 * Allocate card structure.
1244 */
1245 card = mmc_alloc_card(host, &mmc_type);
1246 if (IS_ERR(card)) {
1247 err = PTR_ERR(card);
1248 goto err;
1249 }
1250
1251 card->ocr = ocr;
1252 card->type = MMC_TYPE_MMC;
1253 card->rca = 1;
1254 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
1255 }
1256
1257 /*
1258 * Call the optional HC's init_card function to handle quirks.
1259 */
1260 if (host->ops->init_card)
1261 host->ops->init_card(host, card);
1262
1263 /*
1264 * For native busses: set card RCA and quit open drain mode.
1265 */
1266 if (!mmc_host_is_spi(host)) {
1267 err = mmc_set_relative_addr(card);
1268 if (err)
1269 goto free_card;
1270
1271 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
1272 }
1273
1274 if (!oldcard) {
1275 /*
1276 * Fetch CSD from card.
1277 */
1278 err = mmc_send_csd(card, card->raw_csd);
1279 if (err)
1280 goto free_card;
1281
1282 err = mmc_decode_csd(card);
1283 if (err)
1284 goto free_card;
1285 err = mmc_decode_cid(card);
1286 if (err)
1287 goto free_card;
1288 }
1289
1290 /*
1291 * handling only for cards supporting DSR and hosts requesting
1292 * DSR configuration
1293 */
1294 if (card->csd.dsr_imp && host->dsr_req)
1295 mmc_set_dsr(host);
1296
1297 /*
1298 * Select card, as all following commands rely on that.
1299 */
1300 if (!mmc_host_is_spi(host)) {
1301 err = mmc_select_card(card);
1302 if (err)
1303 goto free_card;
1304 }
1305
1306 if (!oldcard) {
1307 /* Read extended CSD. */
1308 err = mmc_read_ext_csd(card);
1309 if (err)
1310 goto free_card;
1311
1312 /* If doing byte addressing, check if required to do sector
1313 * addressing. Handle the case of <2GB cards needing sector
1314 * addressing. See section 8.1 JEDEC Standard JED84-A441;
1315 * ocr register has bit 30 set for sector addressing.
1316 */
1317 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
1318 mmc_card_set_blockaddr(card);
1319
1320 /* Erase size depends on CSD and Extended CSD */
1321 mmc_set_erase_size(card);
1322 }
1323
1324 /*
1325 * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
1326 * bit. This bit will be lost every time after a reset or power off.
1327 */
1328 if (card->ext_csd.partition_setting_completed ||
1329 (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
1330 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1331 EXT_CSD_ERASE_GROUP_DEF, 1,
1332 card->ext_csd.generic_cmd6_time);
1333
1334 if (err && err != -EBADMSG)
1335 goto free_card;
1336
1337 if (err) {
1338 err = 0;
1339 /*
1340 * Just disable enhanced area off & sz
1341 * will try to enable ERASE_GROUP_DEF
1342 * during next time reinit
1343 */
1344 card->ext_csd.enhanced_area_offset = -EINVAL;
1345 card->ext_csd.enhanced_area_size = -EINVAL;
1346 } else {
1347 card->ext_csd.erase_group_def = 1;
1348 /*
1349 * enable ERASE_GRP_DEF successfully.
1350 * This will affect the erase size, so
1351 * here need to reset erase size
1352 */
1353 mmc_set_erase_size(card);
1354 }
1355 }
1356
1357 /*
1358 * Ensure eMMC user default partition is enabled
1359 */
1360 if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
1361 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
1362 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
1363 card->ext_csd.part_config,
1364 card->ext_csd.part_time);
1365 if (err && err != -EBADMSG)
1366 goto free_card;
1367 }
1368
1369 /*
1370 * Enable power_off_notification byte in the ext_csd register
1371 */
1372 if (card->ext_csd.rev >= 6) {
1373 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1374 EXT_CSD_POWER_OFF_NOTIFICATION,
1375 EXT_CSD_POWER_ON,
1376 card->ext_csd.generic_cmd6_time);
1377 if (err && err != -EBADMSG)
1378 goto free_card;
1379
1380 /*
1381 * The err can be -EBADMSG or 0,
1382 * so check for success and update the flag
1383 */
1384 if (!err)
1385 card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
1386 }
1387
1388 /*
1389 * Select timing interface
1390 */
1391 err = mmc_select_timing(card);
1392 if (err)
1393 goto free_card;
1394
1395 if (mmc_card_hs200(card)) {
1396 err = mmc_hs200_tuning(card);
1397 if (err)
1398 goto free_card;
1399
1400 err = mmc_select_hs400(card);
1401 if (err)
1402 goto free_card;
1403 } else if (mmc_card_hs(card)) {
1404 /* Select the desired bus width optionally */
1405 err = mmc_select_bus_width(card);
1406 if (!IS_ERR_VALUE(err)) {
1407 err = mmc_select_hs_ddr(card);
1408 if (err)
1409 goto free_card;
1410 }
1411 }
1412
1413 /*
1414 * Choose the power class with selected bus interface
1415 */
1416 mmc_select_powerclass(card);
1417
1418 /*
1419 * Enable HPI feature (if supported)
1420 */
1421 if (card->ext_csd.hpi) {
1422 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1423 EXT_CSD_HPI_MGMT, 1,
1424 card->ext_csd.generic_cmd6_time);
1425 if (err && err != -EBADMSG)
1426 goto free_card;
1427 if (err) {
1428 pr_warn("%s: Enabling HPI failed\n",
1429 mmc_hostname(card->host));
1430 err = 0;
1431 } else
1432 card->ext_csd.hpi_en = 1;
1433 }
1434
1435 /*
1436 * If cache size is higher than 0, this indicates
1437 * the existence of cache and it can be turned on.
1438 */
1439 if (card->ext_csd.cache_size > 0) {
1440 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1441 EXT_CSD_CACHE_CTRL, 1,
1442 card->ext_csd.generic_cmd6_time);
1443 if (err && err != -EBADMSG)
1444 goto free_card;
1445
1446 /*
1447 * Only if no error, cache is turned on successfully.
1448 */
1449 if (err) {
1450 pr_warn("%s: Cache is supported, but failed to turn on (%d)\n",
1451 mmc_hostname(card->host), err);
1452 card->ext_csd.cache_ctrl = 0;
1453 err = 0;
1454 } else {
1455 card->ext_csd.cache_ctrl = 1;
1456 }
1457 }
1458
1459 /*
1460 * The mandatory minimum values are defined for packed command.
1461 * read: 5, write: 3
1462 */
1463 if (card->ext_csd.max_packed_writes >= 3 &&
1464 card->ext_csd.max_packed_reads >= 5 &&
1465 host->caps2 & MMC_CAP2_PACKED_CMD) {
1466 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1467 EXT_CSD_EXP_EVENTS_CTRL,
1468 EXT_CSD_PACKED_EVENT_EN,
1469 card->ext_csd.generic_cmd6_time);
1470 if (err && err != -EBADMSG)
1471 goto free_card;
1472 if (err) {
1473 pr_warn("%s: Enabling packed event failed\n",
1474 mmc_hostname(card->host));
1475 card->ext_csd.packed_event_en = 0;
1476 err = 0;
1477 } else {
1478 card->ext_csd.packed_event_en = 1;
1479 }
1480 }
1481
1482 if (!oldcard)
1483 host->card = card;
1484
1485 return 0;
1486
1487 free_card:
1488 if (!oldcard)
1489 mmc_remove_card(card);
1490 err:
1491 return err;
1492 }
1493
1494 static int mmc_can_sleep(struct mmc_card *card)
1495 {
1496 return (card && card->ext_csd.rev >= 3);
1497 }
1498
1499 static int mmc_sleep(struct mmc_host *host)
1500 {
1501 struct mmc_command cmd = {0};
1502 struct mmc_card *card = host->card;
1503 unsigned int timeout_ms = DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000);
1504 int err;
1505
1506 err = mmc_deselect_cards(host);
1507 if (err)
1508 return err;
1509
1510 cmd.opcode = MMC_SLEEP_AWAKE;
1511 cmd.arg = card->rca << 16;
1512 cmd.arg |= 1 << 15;
1513
1514 /*
1515 * If the max_busy_timeout of the host is specified, validate it against
1516 * the sleep cmd timeout. A failure means we need to prevent the host
1517 * from doing hw busy detection, which is done by converting to a R1
1518 * response instead of a R1B.
1519 */
1520 if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout)) {
1521 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1522 } else {
1523 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1524 cmd.busy_timeout = timeout_ms;
1525 }
1526
1527 err = mmc_wait_for_cmd(host, &cmd, 0);
1528 if (err)
1529 return err;
1530
1531 /*
1532 * If the host does not wait while the card signals busy, then we will
1533 * will have to wait the sleep/awake timeout. Note, we cannot use the
1534 * SEND_STATUS command to poll the status because that command (and most
1535 * others) is invalid while the card sleeps.
1536 */
1537 if (!cmd.busy_timeout || !(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
1538 mmc_delay(timeout_ms);
1539
1540 return err;
1541 }
1542
1543 static int mmc_can_poweroff_notify(const struct mmc_card *card)
1544 {
1545 return card &&
1546 mmc_card_mmc(card) &&
1547 (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
1548 }
1549
1550 static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
1551 {
1552 unsigned int timeout = card->ext_csd.generic_cmd6_time;
1553 int err;
1554
1555 /* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
1556 if (notify_type == EXT_CSD_POWER_OFF_LONG)
1557 timeout = card->ext_csd.power_off_longtime;
1558
1559 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1560 EXT_CSD_POWER_OFF_NOTIFICATION,
1561 notify_type, timeout, true, false, false);
1562 if (err)
1563 pr_err("%s: Power Off Notification timed out, %u\n",
1564 mmc_hostname(card->host), timeout);
1565
1566 /* Disable the power off notification after the switch operation. */
1567 card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
1568
1569 return err;
1570 }
1571
1572 /*
1573 * Host is being removed. Free up the current card.
1574 */
1575 static void mmc_remove(struct mmc_host *host)
1576 {
1577 BUG_ON(!host);
1578 BUG_ON(!host->card);
1579
1580 mmc_remove_card(host->card);
1581 host->card = NULL;
1582 }
1583
1584 /*
1585 * Card detection - card is alive.
1586 */
1587 static int mmc_alive(struct mmc_host *host)
1588 {
1589 return mmc_send_status(host->card, NULL);
1590 }
1591
1592 /*
1593 * Card detection callback from host.
1594 */
1595 static void mmc_detect(struct mmc_host *host)
1596 {
1597 int err;
1598
1599 BUG_ON(!host);
1600 BUG_ON(!host->card);
1601
1602 mmc_get_card(host->card);
1603
1604 /*
1605 * Just check if our card has been removed.
1606 */
1607 err = _mmc_detect_card_removed(host);
1608
1609 mmc_put_card(host->card);
1610
1611 if (err) {
1612 mmc_remove(host);
1613
1614 mmc_claim_host(host);
1615 mmc_detach_bus(host);
1616 mmc_power_off(host);
1617 mmc_release_host(host);
1618 }
1619 }
1620
1621 static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
1622 {
1623 int err = 0;
1624 unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
1625 EXT_CSD_POWER_OFF_LONG;
1626
1627 BUG_ON(!host);
1628 BUG_ON(!host->card);
1629
1630 mmc_claim_host(host);
1631
1632 if (mmc_card_suspended(host->card))
1633 goto out;
1634
1635 if (mmc_card_doing_bkops(host->card)) {
1636 err = mmc_stop_bkops(host->card);
1637 if (err)
1638 goto out;
1639 }
1640
1641 err = mmc_flush_cache(host->card);
1642 if (err)
1643 goto out;
1644
1645 if (mmc_can_poweroff_notify(host->card) &&
1646 ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend))
1647 err = mmc_poweroff_notify(host->card, notify_type);
1648 else if (mmc_can_sleep(host->card))
1649 err = mmc_sleep(host);
1650 else if (!mmc_host_is_spi(host))
1651 err = mmc_deselect_cards(host);
1652
1653 if (!err) {
1654 mmc_power_off(host);
1655 mmc_card_set_suspended(host->card);
1656 }
1657 out:
1658 mmc_release_host(host);
1659 return err;
1660 }
1661
1662 /*
1663 * Suspend callback
1664 */
1665 static int mmc_suspend(struct mmc_host *host)
1666 {
1667 int err;
1668
1669 err = _mmc_suspend(host, true);
1670 if (!err) {
1671 pm_runtime_disable(&host->card->dev);
1672 pm_runtime_set_suspended(&host->card->dev);
1673 }
1674
1675 return err;
1676 }
1677
1678 /*
1679 * This function tries to determine if the same card is still present
1680 * and, if so, restore all state to it.
1681 */
1682 static int _mmc_resume(struct mmc_host *host)
1683 {
1684 int err = 0;
1685
1686 BUG_ON(!host);
1687 BUG_ON(!host->card);
1688
1689 mmc_claim_host(host);
1690
1691 if (!mmc_card_suspended(host->card))
1692 goto out;
1693
1694 mmc_power_up(host, host->card->ocr);
1695 err = mmc_init_card(host, host->card->ocr, host->card);
1696 mmc_card_clr_suspended(host->card);
1697
1698 out:
1699 mmc_release_host(host);
1700 return err;
1701 }
1702
1703 /*
1704 * Shutdown callback
1705 */
1706 static int mmc_shutdown(struct mmc_host *host)
1707 {
1708 int err = 0;
1709
1710 /*
1711 * In a specific case for poweroff notify, we need to resume the card
1712 * before we can shutdown it properly.
1713 */
1714 if (mmc_can_poweroff_notify(host->card) &&
1715 !(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE))
1716 err = _mmc_resume(host);
1717
1718 if (!err)
1719 err = _mmc_suspend(host, false);
1720
1721 return err;
1722 }
1723
1724 /*
1725 * Callback for resume.
1726 */
1727 static int mmc_resume(struct mmc_host *host)
1728 {
1729 int err = 0;
1730
1731 if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {
1732 err = _mmc_resume(host);
1733 pm_runtime_set_active(&host->card->dev);
1734 pm_runtime_mark_last_busy(&host->card->dev);
1735 }
1736 pm_runtime_enable(&host->card->dev);
1737
1738 return err;
1739 }
1740
1741 /*
1742 * Callback for runtime_suspend.
1743 */
1744 static int mmc_runtime_suspend(struct mmc_host *host)
1745 {
1746 int err;
1747
1748 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1749 return 0;
1750
1751 err = _mmc_suspend(host, true);
1752 if (err)
1753 pr_err("%s: error %d doing aggessive suspend\n",
1754 mmc_hostname(host), err);
1755
1756 return err;
1757 }
1758
1759 /*
1760 * Callback for runtime_resume.
1761 */
1762 static int mmc_runtime_resume(struct mmc_host *host)
1763 {
1764 int err;
1765
1766 if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
1767 return 0;
1768
1769 err = _mmc_resume(host);
1770 if (err)
1771 pr_err("%s: error %d doing aggessive resume\n",
1772 mmc_hostname(host), err);
1773
1774 return 0;
1775 }
1776
1777 static int mmc_power_restore(struct mmc_host *host)
1778 {
1779 int ret;
1780
1781 mmc_claim_host(host);
1782 ret = mmc_init_card(host, host->card->ocr, host->card);
1783 mmc_release_host(host);
1784
1785 return ret;
1786 }
1787
1788 int mmc_can_reset(struct mmc_card *card)
1789 {
1790 u8 rst_n_function;
1791
1792 rst_n_function = card->ext_csd.rst_n_function;
1793 if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
1794 return 0;
1795 return 1;
1796 }
1797 EXPORT_SYMBOL(mmc_can_reset);
1798
1799 static int mmc_reset(struct mmc_host *host)
1800 {
1801 struct mmc_card *card = host->card;
1802 u32 status;
1803
1804 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
1805 return -EOPNOTSUPP;
1806
1807 if (!mmc_can_reset(card))
1808 return -EOPNOTSUPP;
1809
1810 mmc_host_clk_hold(host);
1811 mmc_set_clock(host, host->f_init);
1812
1813 host->ops->hw_reset(host);
1814
1815 /* If the reset has happened, then a status command will fail */
1816 if (!mmc_send_status(card, &status)) {
1817 mmc_host_clk_release(host);
1818 return -ENOSYS;
1819 }
1820
1821 /* Set initial state and call mmc_set_ios */
1822 mmc_set_initial_state(host);
1823 mmc_host_clk_release(host);
1824
1825 return mmc_power_restore(host);
1826 }
1827
1828 static const struct mmc_bus_ops mmc_ops = {
1829 .remove = mmc_remove,
1830 .detect = mmc_detect,
1831 .suspend = mmc_suspend,
1832 .resume = mmc_resume,
1833 .runtime_suspend = mmc_runtime_suspend,
1834 .runtime_resume = mmc_runtime_resume,
1835 .power_restore = mmc_power_restore,
1836 .alive = mmc_alive,
1837 .shutdown = mmc_shutdown,
1838 .reset = mmc_reset,
1839 };
1840
1841 /*
1842 * Starting point for MMC card init.
1843 */
1844 int mmc_attach_mmc(struct mmc_host *host)
1845 {
1846 int err;
1847 u32 ocr, rocr;
1848
1849 BUG_ON(!host);
1850 WARN_ON(!host->claimed);
1851
1852 /* Set correct bus mode for MMC before attempting attach */
1853 if (!mmc_host_is_spi(host))
1854 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1855
1856 err = mmc_send_op_cond(host, 0, &ocr);
1857 if (err)
1858 return err;
1859
1860 mmc_attach_bus(host, &mmc_ops);
1861 if (host->ocr_avail_mmc)
1862 host->ocr_avail = host->ocr_avail_mmc;
1863
1864 /*
1865 * We need to get OCR a different way for SPI.
1866 */
1867 if (mmc_host_is_spi(host)) {
1868 err = mmc_spi_read_ocr(host, 1, &ocr);
1869 if (err)
1870 goto err;
1871 }
1872
1873 rocr = mmc_select_voltage(host, ocr);
1874
1875 /*
1876 * Can we support the voltage of the card?
1877 */
1878 if (!rocr) {
1879 err = -EINVAL;
1880 goto err;
1881 }
1882
1883 /*
1884 * Detect and init the card.
1885 */
1886 err = mmc_init_card(host, rocr, NULL);
1887 if (err)
1888 goto err;
1889
1890 mmc_release_host(host);
1891 err = mmc_add_card(host->card);
1892 mmc_claim_host(host);
1893 if (err)
1894 goto remove_card;
1895
1896 return 0;
1897
1898 remove_card:
1899 mmc_release_host(host);
1900 mmc_remove_card(host->card);
1901 mmc_claim_host(host);
1902 host->card = NULL;
1903 err:
1904 mmc_detach_bus(host);
1905
1906 pr_err("%s: error %d whilst initialising MMC card\n",
1907 mmc_hostname(host), err);
1908
1909 return err;
1910 }
Linux kernel - Deliverables
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