1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/drivers/mmc/core/mmc.c
4 *
5 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
6 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
7 * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
8 */
9
10 #include <linux/err.h>
11 #include <linux/of.h>
12 #include <linux/slab.h>
13 #include <linux/stat.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/random.h>
16 #include <linux/sysfs.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 "card.h"
24 #include "host.h"
25 #include "bus.h"
26 #include "mmc_ops.h"
27 #include "quirks.h"
28 #include "sd_ops.h"
29 #include "pwrseq.h"
30
31 #define DEFAULT_CMD6_TIMEOUT_MS 500
32 #define MIN_CACHE_EN_TIMEOUT_MS 1600
33 #define CACHE_FLUSH_TIMEOUT_MS 30000 /* 30s */
34
35 static const unsigned int tran_exp[] = {
36 10000, 100000, 1000000, 10000000,
37 0, 0, 0, 0
38 };
39
40 static const unsigned char tran_mant[] = {
41 0, 10, 12, 13, 15, 20, 25, 30,
42 35, 40, 45, 50, 55, 60, 70, 80,
43 };
44
45 static const unsigned int taac_exp[] = {
46 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
47 };
48
49 static const unsigned int taac_mant[] = {
50 0, 10, 12, 13, 15, 20, 25, 30,
51 35, 40, 45, 50, 55, 60, 70, 80,
52 };
53
54 #define UNSTUFF_BITS(resp,start,size) \
55 ({ \
56 const int __size = size; \
57 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
58 const int __off = 3 - ((start) / 32); \
59 const int __shft = (start) & 31; \
60 u32 __res; \
61 \
62 __res = resp[__off] >> __shft; \
63 if (__size + __shft > 32) \
64 __res |= resp[__off-1] << ((32 - __shft) % 32); \
65 __res & __mask; \
66 })
67
68 /*
69 * Given the decoded CSD structure, decode the raw CID to our CID structure.
70 */
mmc_decode_cid(struct mmc_card * card)71 static int mmc_decode_cid(struct mmc_card *card)
72 {
73 u32 *resp = card->raw_cid;
74
75 /*
76 * Add the raw card ID (cid) data to the entropy pool. It doesn't
77 * matter that not all of it is unique, it's just bonus entropy.
78 */
79 add_device_randomness(&card->raw_cid, sizeof(card->raw_cid));
80
81 /*
82 * The selection of the format here is based upon published
83 * specs from sandisk and from what people have reported.
84 */
85 switch (card->csd.mmca_vsn) {
86 case 0: /* MMC v1.0 - v1.2 */
87 case 1: /* MMC v1.4 */
88 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
89 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
90 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
91 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
92 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
93 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
94 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
95 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
96 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
97 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
98 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
99 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
100 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
101 break;
102
103 case 2: /* MMC v2.0 - v2.2 */
104 case 3: /* MMC v3.1 - v3.3 */
105 case 4: /* MMC v4 */
106 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
107 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
108 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
109 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
110 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
111 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
112 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
113 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
114 card->cid.prv = UNSTUFF_BITS(resp, 48, 8);
115 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
116 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
117 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
118 break;
119
120 default:
121 pr_err("%s: card has unknown MMCA version %d\n",
122 mmc_hostname(card->host), card->csd.mmca_vsn);
123 return -EINVAL;
124 }
125
126 return 0;
127 }
128
mmc_set_erase_size(struct mmc_card * card)129 static void mmc_set_erase_size(struct mmc_card *card)
130 {
131 if (card->ext_csd.erase_group_def & 1)
132 card->erase_size = card->ext_csd.hc_erase_size;
133 else
134 card->erase_size = card->csd.erase_size;
135
136 mmc_init_erase(card);
137 }
138
139 /*
140 * Given a 128-bit response, decode to our card CSD structure.
141 */
mmc_decode_csd(struct mmc_card * card)142 static int mmc_decode_csd(struct mmc_card *card)
143 {
144 struct mmc_csd *csd = &card->csd;
145 unsigned int e, m, a, b;
146 u32 *resp = card->raw_csd;
147
148 /*
149 * We only understand CSD structure v1.1 and v1.2.
150 * v1.2 has extra information in bits 15, 11 and 10.
151 * We also support eMMC v4.4 & v4.41.
152 */
153 csd->structure = UNSTUFF_BITS(resp, 126, 2);
154 if (csd->structure == 0) {
155 pr_err("%s: unrecognised CSD structure version %d\n",
156 mmc_hostname(card->host), csd->structure);
157 return -EINVAL;
158 }
159
160 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
161 m = UNSTUFF_BITS(resp, 115, 4);
162 e = UNSTUFF_BITS(resp, 112, 3);
163 csd->taac_ns = (taac_exp[e] * taac_mant[m] + 9) / 10;
164 csd->taac_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
165
166 m = UNSTUFF_BITS(resp, 99, 4);
167 e = UNSTUFF_BITS(resp, 96, 3);
168 csd->max_dtr = tran_exp[e] * tran_mant[m];
169 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
170
171 e = UNSTUFF_BITS(resp, 47, 3);
172 m = UNSTUFF_BITS(resp, 62, 12);
173 csd->capacity = (1 + m) << (e + 2);
174
175 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
176 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
177 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
178 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
179 csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
180 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
181 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
182 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
183
184 if (csd->write_blkbits >= 9) {
185 a = UNSTUFF_BITS(resp, 42, 5);
186 b = UNSTUFF_BITS(resp, 37, 5);
187 csd->erase_size = (a + 1) * (b + 1);
188 csd->erase_size <<= csd->write_blkbits - 9;
189 }
190
191 return 0;
192 }
193
mmc_select_card_type(struct mmc_card * card)194 static void mmc_select_card_type(struct mmc_card *card)
195 {
196 struct mmc_host *host = card->host;
197 u8 card_type = card->ext_csd.raw_card_type;
198 u32 caps = host->caps, caps2 = host->caps2;
199 unsigned int hs_max_dtr = 0, hs200_max_dtr = 0;
200 unsigned int avail_type = 0;
201
202 if (caps & MMC_CAP_MMC_HIGHSPEED &&
203 card_type & EXT_CSD_CARD_TYPE_HS_26) {
204 hs_max_dtr = MMC_HIGH_26_MAX_DTR;
205 avail_type |= EXT_CSD_CARD_TYPE_HS_26;
206 }
207
208 if (caps & MMC_CAP_MMC_HIGHSPEED &&
209 card_type & EXT_CSD_CARD_TYPE_HS_52) {
210 hs_max_dtr = MMC_HIGH_52_MAX_DTR;
211 avail_type |= EXT_CSD_CARD_TYPE_HS_52;
212 }
213
214 if (caps & (MMC_CAP_1_8V_DDR | MMC_CAP_3_3V_DDR) &&
215 card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) {
216 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
217 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_8V;
218 }
219
220 if (caps & MMC_CAP_1_2V_DDR &&
221 card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
222 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
223 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_2V;
224 }
225
226 if (caps2 & MMC_CAP2_HS200_1_8V_SDR &&
227 card_type & EXT_CSD_CARD_TYPE_HS200_1_8V) {
228 hs200_max_dtr = MMC_HS200_MAX_DTR;
229 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_8V;
230 }
231
232 if (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
233 card_type & EXT_CSD_CARD_TYPE_HS200_1_2V) {
234 hs200_max_dtr = MMC_HS200_MAX_DTR;
235 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_2V;
236 }
237
238 if (caps2 & MMC_CAP2_HS400_1_8V &&
239 card_type & EXT_CSD_CARD_TYPE_HS400_1_8V) {
240 hs200_max_dtr = MMC_HS200_MAX_DTR;
241 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_8V;
242 }
243
244 if (caps2 & MMC_CAP2_HS400_1_2V &&
245 card_type & EXT_CSD_CARD_TYPE_HS400_1_2V) {
246 hs200_max_dtr = MMC_HS200_MAX_DTR;
247 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_2V;
248 }
249
250 if ((caps2 & MMC_CAP2_HS400_ES) &&
251 card->ext_csd.strobe_support &&
252 (avail_type & EXT_CSD_CARD_TYPE_HS400))
253 avail_type |= EXT_CSD_CARD_TYPE_HS400ES;
254
255 card->ext_csd.hs_max_dtr = hs_max_dtr;
256 card->ext_csd.hs200_max_dtr = hs200_max_dtr;
257 card->mmc_avail_type = avail_type;
258 }
259
mmc_manage_enhanced_area(struct mmc_card * card,u8 * ext_csd)260 static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd)
261 {
262 u8 hc_erase_grp_sz, hc_wp_grp_sz;
263
264 /*
265 * Disable these attributes by default
266 */
267 card->ext_csd.enhanced_area_offset = -EINVAL;
268 card->ext_csd.enhanced_area_size = -EINVAL;
269
270 /*
271 * Enhanced area feature support -- check whether the eMMC
272 * card has the Enhanced area enabled. If so, export enhanced
273 * area offset and size to user by adding sysfs interface.
274 */
275 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
276 (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
277 if (card->ext_csd.partition_setting_completed) {
278 hc_erase_grp_sz =
279 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
280 hc_wp_grp_sz =
281 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
282
283 /*
284 * calculate the enhanced data area offset, in bytes
285 */
286 card->ext_csd.enhanced_area_offset =
287 (((unsigned long long)ext_csd[139]) << 24) +
288 (((unsigned long long)ext_csd[138]) << 16) +
289 (((unsigned long long)ext_csd[137]) << 8) +
290 (((unsigned long long)ext_csd[136]));
291 if (mmc_card_blockaddr(card))
292 card->ext_csd.enhanced_area_offset <<= 9;
293 /*
294 * calculate the enhanced data area size, in kilobytes
295 */
296 card->ext_csd.enhanced_area_size =
297 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
298 ext_csd[140];
299 card->ext_csd.enhanced_area_size *=
300 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
301 card->ext_csd.enhanced_area_size <<= 9;
302 } else {
303 pr_warn("%s: defines enhanced area without partition setting complete\n",
304 mmc_hostname(card->host));
305 }
306 }
307 }
308
mmc_part_add(struct mmc_card * card,u64 size,unsigned int part_cfg,char * name,int idx,bool ro,int area_type)309 static void mmc_part_add(struct mmc_card *card, u64 size,
310 unsigned int part_cfg, char *name, int idx, bool ro,
311 int area_type)
312 {
313 card->part[card->nr_parts].size = size;
314 card->part[card->nr_parts].part_cfg = part_cfg;
315 sprintf(card->part[card->nr_parts].name, name, idx);
316 card->part[card->nr_parts].force_ro = ro;
317 card->part[card->nr_parts].area_type = area_type;
318 card->nr_parts++;
319 }
320
mmc_manage_gp_partitions(struct mmc_card * card,u8 * ext_csd)321 static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd)
322 {
323 int idx;
324 u8 hc_erase_grp_sz, hc_wp_grp_sz;
325 u64 part_size;
326
327 /*
328 * General purpose partition feature support --
329 * If ext_csd has the size of general purpose partitions,
330 * set size, part_cfg, partition name in mmc_part.
331 */
332 if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
333 EXT_CSD_PART_SUPPORT_PART_EN) {
334 hc_erase_grp_sz =
335 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
336 hc_wp_grp_sz =
337 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
338
339 for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
340 if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
341 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
342 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
343 continue;
344 if (card->ext_csd.partition_setting_completed == 0) {
345 pr_warn("%s: has partition size defined without partition complete\n",
346 mmc_hostname(card->host));
347 break;
348 }
349 part_size =
350 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
351 << 16) +
352 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
353 << 8) +
354 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
355 part_size *= (hc_erase_grp_sz * hc_wp_grp_sz);
356 mmc_part_add(card, part_size << 19,
357 EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
358 "gp%d", idx, false,
359 MMC_BLK_DATA_AREA_GP);
360 }
361 }
362 }
363
364 /* Minimum partition switch timeout in milliseconds */
365 #define MMC_MIN_PART_SWITCH_TIME 300
366
367 /*
368 * Decode extended CSD.
369 */
mmc_decode_ext_csd(struct mmc_card * card,u8 * ext_csd)370 static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
371 {
372 int err = 0, idx;
373 u64 part_size;
374 struct device_node *np;
375 bool broken_hpi = false;
376
377 /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
378 card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
379 if (card->csd.structure == 3) {
380 if (card->ext_csd.raw_ext_csd_structure > 2) {
381 pr_err("%s: unrecognised EXT_CSD structure "
382 "version %d\n", mmc_hostname(card->host),
383 card->ext_csd.raw_ext_csd_structure);
384 err = -EINVAL;
385 goto out;
386 }
387 }
388
389 np = mmc_of_find_child_device(card->host, 0);
390 if (np && of_device_is_compatible(np, "mmc-card"))
391 broken_hpi = of_property_read_bool(np, "broken-hpi");
392 of_node_put(np);
393
394 /*
395 * The EXT_CSD format is meant to be forward compatible. As long
396 * as CSD_STRUCTURE does not change, all values for EXT_CSD_REV
397 * are authorized, see JEDEC JESD84-B50 section B.8.
398 */
399 card->ext_csd.rev = ext_csd[EXT_CSD_REV];
400
401 /* fixup device after ext_csd revision field is updated */
402 mmc_fixup_device(card, mmc_ext_csd_fixups);
403
404 card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
405 card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
406 card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
407 card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
408 if (card->ext_csd.rev >= 2) {
409 card->ext_csd.sectors =
410 ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
411 ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
412 ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
413 ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
414
415 /* Cards with density > 2GiB are sector addressed */
416 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
417 mmc_card_set_blockaddr(card);
418 }
419
420 card->ext_csd.strobe_support = ext_csd[EXT_CSD_STROBE_SUPPORT];
421 card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
422 mmc_select_card_type(card);
423
424 card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
425 card->ext_csd.raw_erase_timeout_mult =
426 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
427 card->ext_csd.raw_hc_erase_grp_size =
428 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
429 card->ext_csd.raw_boot_mult =
430 ext_csd[EXT_CSD_BOOT_MULT];
431 if (card->ext_csd.rev >= 3) {
432 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
433 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
434
435 /* EXT_CSD value is in units of 10ms, but we store in ms */
436 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
437
438 /* Sleep / awake timeout in 100ns units */
439 if (sa_shift > 0 && sa_shift <= 0x17)
440 card->ext_csd.sa_timeout =
441 1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
442 card->ext_csd.erase_group_def =
443 ext_csd[EXT_CSD_ERASE_GROUP_DEF];
444 card->ext_csd.hc_erase_timeout = 300 *
445 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
446 card->ext_csd.hc_erase_size =
447 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
448
449 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
450
451 /*
452 * There are two boot regions of equal size, defined in
453 * multiples of 128K.
454 */
455 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
456 for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
457 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
458 mmc_part_add(card, part_size,
459 EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
460 "boot%d", idx, true,
461 MMC_BLK_DATA_AREA_BOOT);
462 }
463 }
464 }
465
466 card->ext_csd.raw_hc_erase_gap_size =
467 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
468 card->ext_csd.raw_sec_trim_mult =
469 ext_csd[EXT_CSD_SEC_TRIM_MULT];
470 card->ext_csd.raw_sec_erase_mult =
471 ext_csd[EXT_CSD_SEC_ERASE_MULT];
472 card->ext_csd.raw_sec_feature_support =
473 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
474 card->ext_csd.raw_trim_mult =
475 ext_csd[EXT_CSD_TRIM_MULT];
476 card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
477 card->ext_csd.raw_driver_strength = ext_csd[EXT_CSD_DRIVER_STRENGTH];
478 if (card->ext_csd.rev >= 4) {
479 if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED] &
480 EXT_CSD_PART_SETTING_COMPLETED)
481 card->ext_csd.partition_setting_completed = 1;
482 else
483 card->ext_csd.partition_setting_completed = 0;
484
485 mmc_manage_enhanced_area(card, ext_csd);
486
487 mmc_manage_gp_partitions(card, ext_csd);
488
489 card->ext_csd.sec_trim_mult =
490 ext_csd[EXT_CSD_SEC_TRIM_MULT];
491 card->ext_csd.sec_erase_mult =
492 ext_csd[EXT_CSD_SEC_ERASE_MULT];
493 card->ext_csd.sec_feature_support =
494 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
495 card->ext_csd.trim_timeout = 300 *
496 ext_csd[EXT_CSD_TRIM_MULT];
497
498 /*
499 * Note that the call to mmc_part_add above defaults to read
500 * only. If this default assumption is changed, the call must
501 * take into account the value of boot_locked below.
502 */
503 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
504 card->ext_csd.boot_ro_lockable = true;
505
506 /* Save power class values */
507 card->ext_csd.raw_pwr_cl_52_195 =
508 ext_csd[EXT_CSD_PWR_CL_52_195];
509 card->ext_csd.raw_pwr_cl_26_195 =
510 ext_csd[EXT_CSD_PWR_CL_26_195];
511 card->ext_csd.raw_pwr_cl_52_360 =
512 ext_csd[EXT_CSD_PWR_CL_52_360];
513 card->ext_csd.raw_pwr_cl_26_360 =
514 ext_csd[EXT_CSD_PWR_CL_26_360];
515 card->ext_csd.raw_pwr_cl_200_195 =
516 ext_csd[EXT_CSD_PWR_CL_200_195];
517 card->ext_csd.raw_pwr_cl_200_360 =
518 ext_csd[EXT_CSD_PWR_CL_200_360];
519 card->ext_csd.raw_pwr_cl_ddr_52_195 =
520 ext_csd[EXT_CSD_PWR_CL_DDR_52_195];
521 card->ext_csd.raw_pwr_cl_ddr_52_360 =
522 ext_csd[EXT_CSD_PWR_CL_DDR_52_360];
523 card->ext_csd.raw_pwr_cl_ddr_200_360 =
524 ext_csd[EXT_CSD_PWR_CL_DDR_200_360];
525 }
526
527 if (card->ext_csd.rev >= 5) {
528 /* Adjust production date as per JEDEC JESD84-B451 */
529 if (card->cid.year < 2010)
530 card->cid.year += 16;
531
532 /* check whether the eMMC card supports BKOPS */
533 if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
534 card->ext_csd.bkops = 1;
535 card->ext_csd.man_bkops_en =
536 (ext_csd[EXT_CSD_BKOPS_EN] &
537 EXT_CSD_MANUAL_BKOPS_MASK);
538 card->ext_csd.raw_bkops_status =
539 ext_csd[EXT_CSD_BKOPS_STATUS];
540 if (card->ext_csd.man_bkops_en)
541 pr_debug("%s: MAN_BKOPS_EN bit is set\n",
542 mmc_hostname(card->host));
543 card->ext_csd.auto_bkops_en =
544 (ext_csd[EXT_CSD_BKOPS_EN] &
545 EXT_CSD_AUTO_BKOPS_MASK);
546 if (card->ext_csd.auto_bkops_en)
547 pr_debug("%s: AUTO_BKOPS_EN bit is set\n",
548 mmc_hostname(card->host));
549 }
550
551 /* check whether the eMMC card supports HPI */
552 if (!mmc_card_broken_hpi(card) &&
553 !broken_hpi && (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1)) {
554 card->ext_csd.hpi = 1;
555 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
556 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
557 else
558 card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
559 /*
560 * Indicate the maximum timeout to close
561 * a command interrupted by HPI
562 */
563 card->ext_csd.out_of_int_time =
564 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
565 }
566
567 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
568 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
569
570 /*
571 * RPMB regions are defined in multiples of 128K.
572 */
573 card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
574 if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) {
575 mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
576 EXT_CSD_PART_CONFIG_ACC_RPMB,
577 "rpmb", 0, false,
578 MMC_BLK_DATA_AREA_RPMB);
579 }
580 }
581
582 card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
583 if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
584 card->erased_byte = 0xFF;
585 else
586 card->erased_byte = 0x0;
587
588 /* eMMC v4.5 or later */
589 card->ext_csd.generic_cmd6_time = DEFAULT_CMD6_TIMEOUT_MS;
590 if (card->ext_csd.rev >= 6) {
591 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
592
593 card->ext_csd.generic_cmd6_time = 10 *
594 ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
595 card->ext_csd.power_off_longtime = 10 *
596 ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
597
598 card->ext_csd.cache_size =
599 ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
600 ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
601 ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
602 ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
603
604 if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
605 card->ext_csd.data_sector_size = 4096;
606 else
607 card->ext_csd.data_sector_size = 512;
608
609 if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
610 (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
611 card->ext_csd.data_tag_unit_size =
612 ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
613 (card->ext_csd.data_sector_size);
614 } else {
615 card->ext_csd.data_tag_unit_size = 0;
616 }
617
618 card->ext_csd.max_packed_writes =
619 ext_csd[EXT_CSD_MAX_PACKED_WRITES];
620 card->ext_csd.max_packed_reads =
621 ext_csd[EXT_CSD_MAX_PACKED_READS];
622 } else {
623 card->ext_csd.data_sector_size = 512;
624 }
625
626 /*
627 * GENERIC_CMD6_TIME is to be used "unless a specific timeout is defined
628 * when accessing a specific field", so use it here if there is no
629 * PARTITION_SWITCH_TIME.
630 */
631 if (!card->ext_csd.part_time)
632 card->ext_csd.part_time = card->ext_csd.generic_cmd6_time;
633 /* Some eMMC set the value too low so set a minimum */
634 if (card->ext_csd.part_time < MMC_MIN_PART_SWITCH_TIME)
635 card->ext_csd.part_time = MMC_MIN_PART_SWITCH_TIME;
636
637 /* eMMC v5 or later */
638 if (card->ext_csd.rev >= 7) {
639 memcpy(card->ext_csd.fwrev, &ext_csd[EXT_CSD_FIRMWARE_VERSION],
640 MMC_FIRMWARE_LEN);
641 card->ext_csd.ffu_capable =
642 (ext_csd[EXT_CSD_SUPPORTED_MODE] & 0x1) &&
643 !(ext_csd[EXT_CSD_FW_CONFIG] & 0x1);
644
645 card->ext_csd.pre_eol_info = ext_csd[EXT_CSD_PRE_EOL_INFO];
646 card->ext_csd.device_life_time_est_typ_a =
647 ext_csd[EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_A];
648 card->ext_csd.device_life_time_est_typ_b =
649 ext_csd[EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_B];
650 }
651
652 /* eMMC v5.1 or later */
653 if (card->ext_csd.rev >= 8) {
654 card->ext_csd.cmdq_support = ext_csd[EXT_CSD_CMDQ_SUPPORT] &
655 EXT_CSD_CMDQ_SUPPORTED;
656 card->ext_csd.cmdq_depth = (ext_csd[EXT_CSD_CMDQ_DEPTH] &
657 EXT_CSD_CMDQ_DEPTH_MASK) + 1;
658 /* Exclude inefficiently small queue depths */
659 if (card->ext_csd.cmdq_depth <= 2) {
660 card->ext_csd.cmdq_support = false;
661 card->ext_csd.cmdq_depth = 0;
662 }
663 if (card->ext_csd.cmdq_support) {
664 pr_debug("%s: Command Queue supported depth %u\n",
665 mmc_hostname(card->host),
666 card->ext_csd.cmdq_depth);
667 }
668 card->ext_csd.enhanced_rpmb_supported =
669 (card->ext_csd.rel_param &
670 EXT_CSD_WR_REL_PARAM_EN_RPMB_REL_WR);
671 }
672 out:
673 return err;
674 }
675
mmc_read_ext_csd(struct mmc_card * card)676 static int mmc_read_ext_csd(struct mmc_card *card)
677 {
678 u8 *ext_csd;
679 int err;
680
681 if (!mmc_can_ext_csd(card))
682 return 0;
683
684 err = mmc_get_ext_csd(card, &ext_csd);
685 if (err) {
686 /* If the host or the card can't do the switch,
687 * fail more gracefully. */
688 if ((err != -EINVAL)
689 && (err != -ENOSYS)
690 && (err != -EFAULT))
691 return err;
692
693 /*
694 * High capacity cards should have this "magic" size
695 * stored in their CSD.
696 */
697 if (card->csd.capacity == (4096 * 512)) {
698 pr_err("%s: unable to read EXT_CSD on a possible high capacity card. Card will be ignored.\n",
699 mmc_hostname(card->host));
700 } else {
701 pr_warn("%s: unable to read EXT_CSD, performance might suffer\n",
702 mmc_hostname(card->host));
703 err = 0;
704 }
705
706 return err;
707 }
708
709 err = mmc_decode_ext_csd(card, ext_csd);
710 kfree(ext_csd);
711 return err;
712 }
713
mmc_compare_ext_csds(struct mmc_card * card,unsigned bus_width)714 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
715 {
716 u8 *bw_ext_csd;
717 int err;
718
719 if (bus_width == MMC_BUS_WIDTH_1)
720 return 0;
721
722 err = mmc_get_ext_csd(card, &bw_ext_csd);
723 if (err)
724 return err;
725
726 /* only compare read only fields */
727 err = !((card->ext_csd.raw_partition_support ==
728 bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
729 (card->ext_csd.raw_erased_mem_count ==
730 bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
731 (card->ext_csd.rev ==
732 bw_ext_csd[EXT_CSD_REV]) &&
733 (card->ext_csd.raw_ext_csd_structure ==
734 bw_ext_csd[EXT_CSD_STRUCTURE]) &&
735 (card->ext_csd.raw_card_type ==
736 bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
737 (card->ext_csd.raw_s_a_timeout ==
738 bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
739 (card->ext_csd.raw_hc_erase_gap_size ==
740 bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
741 (card->ext_csd.raw_erase_timeout_mult ==
742 bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
743 (card->ext_csd.raw_hc_erase_grp_size ==
744 bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
745 (card->ext_csd.raw_sec_trim_mult ==
746 bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
747 (card->ext_csd.raw_sec_erase_mult ==
748 bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
749 (card->ext_csd.raw_sec_feature_support ==
750 bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
751 (card->ext_csd.raw_trim_mult ==
752 bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
753 (card->ext_csd.raw_sectors[0] ==
754 bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
755 (card->ext_csd.raw_sectors[1] ==
756 bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
757 (card->ext_csd.raw_sectors[2] ==
758 bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
759 (card->ext_csd.raw_sectors[3] ==
760 bw_ext_csd[EXT_CSD_SEC_CNT + 3]) &&
761 (card->ext_csd.raw_pwr_cl_52_195 ==
762 bw_ext_csd[EXT_CSD_PWR_CL_52_195]) &&
763 (card->ext_csd.raw_pwr_cl_26_195 ==
764 bw_ext_csd[EXT_CSD_PWR_CL_26_195]) &&
765 (card->ext_csd.raw_pwr_cl_52_360 ==
766 bw_ext_csd[EXT_CSD_PWR_CL_52_360]) &&
767 (card->ext_csd.raw_pwr_cl_26_360 ==
768 bw_ext_csd[EXT_CSD_PWR_CL_26_360]) &&
769 (card->ext_csd.raw_pwr_cl_200_195 ==
770 bw_ext_csd[EXT_CSD_PWR_CL_200_195]) &&
771 (card->ext_csd.raw_pwr_cl_200_360 ==
772 bw_ext_csd[EXT_CSD_PWR_CL_200_360]) &&
773 (card->ext_csd.raw_pwr_cl_ddr_52_195 ==
774 bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_195]) &&
775 (card->ext_csd.raw_pwr_cl_ddr_52_360 ==
776 bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]) &&
777 (card->ext_csd.raw_pwr_cl_ddr_200_360 ==
778 bw_ext_csd[EXT_CSD_PWR_CL_DDR_200_360]));
779
780 if (err)
781 err = -EINVAL;
782
783 kfree(bw_ext_csd);
784 return err;
785 }
786
787 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
788 card->raw_cid[2], card->raw_cid[3]);
789 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
790 card->raw_csd[2], card->raw_csd[3]);
791 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
792 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
793 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
794 MMC_DEV_ATTR(ffu_capable, "%d\n", card->ext_csd.ffu_capable);
795 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
796 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
797 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
798 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
799 MMC_DEV_ATTR(prv, "0x%x\n", card->cid.prv);
800 MMC_DEV_ATTR(rev, "0x%x\n", card->ext_csd.rev);
801 MMC_DEV_ATTR(pre_eol_info, "0x%02x\n", card->ext_csd.pre_eol_info);
802 MMC_DEV_ATTR(life_time, "0x%02x 0x%02x\n",
803 card->ext_csd.device_life_time_est_typ_a,
804 card->ext_csd.device_life_time_est_typ_b);
805 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
806 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
807 card->ext_csd.enhanced_area_offset);
808 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
809 MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
810 MMC_DEV_ATTR(enhanced_rpmb_supported, "%#x\n",
811 card->ext_csd.enhanced_rpmb_supported);
812 MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
813 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
814 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
815 MMC_DEV_ATTR(cmdq_en, "%d\n", card->ext_csd.cmdq_en);
816
mmc_fwrev_show(struct device * dev,struct device_attribute * attr,char * buf)817 static ssize_t mmc_fwrev_show(struct device *dev,
818 struct device_attribute *attr,
819 char *buf)
820 {
821 struct mmc_card *card = mmc_dev_to_card(dev);
822
823 if (card->ext_csd.rev < 7)
824 return sysfs_emit(buf, "0x%x\n", card->cid.fwrev);
825 else
826 return sysfs_emit(buf, "0x%*phN\n", MMC_FIRMWARE_LEN,
827 card->ext_csd.fwrev);
828 }
829
830 static DEVICE_ATTR(fwrev, S_IRUGO, mmc_fwrev_show, NULL);
831
mmc_dsr_show(struct device * dev,struct device_attribute * attr,char * buf)832 static ssize_t mmc_dsr_show(struct device *dev,
833 struct device_attribute *attr,
834 char *buf)
835 {
836 struct mmc_card *card = mmc_dev_to_card(dev);
837 struct mmc_host *host = card->host;
838
839 if (card->csd.dsr_imp && host->dsr_req)
840 return sysfs_emit(buf, "0x%x\n", host->dsr);
841 else
842 /* return default DSR value */
843 return sysfs_emit(buf, "0x%x\n", 0x404);
844 }
845
846 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
847
848 static struct attribute *mmc_std_attrs[] = {
849 &dev_attr_cid.attr,
850 &dev_attr_csd.attr,
851 &dev_attr_date.attr,
852 &dev_attr_erase_size.attr,
853 &dev_attr_preferred_erase_size.attr,
854 &dev_attr_fwrev.attr,
855 &dev_attr_ffu_capable.attr,
856 &dev_attr_hwrev.attr,
857 &dev_attr_manfid.attr,
858 &dev_attr_name.attr,
859 &dev_attr_oemid.attr,
860 &dev_attr_prv.attr,
861 &dev_attr_rev.attr,
862 &dev_attr_pre_eol_info.attr,
863 &dev_attr_life_time.attr,
864 &dev_attr_serial.attr,
865 &dev_attr_enhanced_area_offset.attr,
866 &dev_attr_enhanced_area_size.attr,
867 &dev_attr_raw_rpmb_size_mult.attr,
868 &dev_attr_enhanced_rpmb_supported.attr,
869 &dev_attr_rel_sectors.attr,
870 &dev_attr_ocr.attr,
871 &dev_attr_rca.attr,
872 &dev_attr_dsr.attr,
873 &dev_attr_cmdq_en.attr,
874 NULL,
875 };
876 ATTRIBUTE_GROUPS(mmc_std);
877
878 static struct device_type mmc_type = {
879 .groups = mmc_std_groups,
880 };
881
882 /*
883 * Select the PowerClass for the current bus width
884 * If power class is defined for 4/8 bit bus in the
885 * extended CSD register, select it by executing the
886 * mmc_switch command.
887 */
__mmc_select_powerclass(struct mmc_card * card,unsigned int bus_width)888 static int __mmc_select_powerclass(struct mmc_card *card,
889 unsigned int bus_width)
890 {
891 struct mmc_host *host = card->host;
892 struct mmc_ext_csd *ext_csd = &card->ext_csd;
893 unsigned int pwrclass_val = 0;
894 int err = 0;
895
896 switch (1 << host->ios.vdd) {
897 case MMC_VDD_165_195:
898 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
899 pwrclass_val = ext_csd->raw_pwr_cl_26_195;
900 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
901 pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
902 ext_csd->raw_pwr_cl_52_195 :
903 ext_csd->raw_pwr_cl_ddr_52_195;
904 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
905 pwrclass_val = ext_csd->raw_pwr_cl_200_195;
906 break;
907 case MMC_VDD_27_28:
908 case MMC_VDD_28_29:
909 case MMC_VDD_29_30:
910 case MMC_VDD_30_31:
911 case MMC_VDD_31_32:
912 case MMC_VDD_32_33:
913 case MMC_VDD_33_34:
914 case MMC_VDD_34_35:
915 case MMC_VDD_35_36:
916 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
917 pwrclass_val = ext_csd->raw_pwr_cl_26_360;
918 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
919 pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
920 ext_csd->raw_pwr_cl_52_360 :
921 ext_csd->raw_pwr_cl_ddr_52_360;
922 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
923 pwrclass_val = (bus_width == EXT_CSD_DDR_BUS_WIDTH_8) ?
924 ext_csd->raw_pwr_cl_ddr_200_360 :
925 ext_csd->raw_pwr_cl_200_360;
926 break;
927 default:
928 pr_warn("%s: Voltage range not supported for power class\n",
929 mmc_hostname(host));
930 return -EINVAL;
931 }
932
933 if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
934 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
935 EXT_CSD_PWR_CL_8BIT_SHIFT;
936 else
937 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
938 EXT_CSD_PWR_CL_4BIT_SHIFT;
939
940 /* If the power class is different from the default value */
941 if (pwrclass_val > 0) {
942 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
943 EXT_CSD_POWER_CLASS,
944 pwrclass_val,
945 card->ext_csd.generic_cmd6_time);
946 }
947
948 return err;
949 }
950
mmc_select_powerclass(struct mmc_card * card)951 static int mmc_select_powerclass(struct mmc_card *card)
952 {
953 struct mmc_host *host = card->host;
954 u32 bus_width, ext_csd_bits;
955 int err, ddr;
956
957 /* Power class selection is supported for versions >= 4.0 */
958 if (!mmc_can_ext_csd(card))
959 return 0;
960
961 bus_width = host->ios.bus_width;
962 /* Power class values are defined only for 4/8 bit bus */
963 if (bus_width == MMC_BUS_WIDTH_1)
964 return 0;
965
966 ddr = card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52;
967 if (ddr)
968 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
969 EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
970 else
971 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
972 EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4;
973
974 err = __mmc_select_powerclass(card, ext_csd_bits);
975 if (err)
976 pr_warn("%s: power class selection to bus width %d ddr %d failed\n",
977 mmc_hostname(host), 1 << bus_width, ddr);
978
979 return err;
980 }
981
982 /*
983 * Set the bus speed for the selected speed mode.
984 */
mmc_set_bus_speed(struct mmc_card * card)985 static void mmc_set_bus_speed(struct mmc_card *card)
986 {
987 unsigned int max_dtr = (unsigned int)-1;
988
989 if ((mmc_card_hs200(card) || mmc_card_hs400(card)) &&
990 max_dtr > card->ext_csd.hs200_max_dtr)
991 max_dtr = card->ext_csd.hs200_max_dtr;
992 else if (mmc_card_hs(card) && max_dtr > card->ext_csd.hs_max_dtr)
993 max_dtr = card->ext_csd.hs_max_dtr;
994 else if (max_dtr > card->csd.max_dtr)
995 max_dtr = card->csd.max_dtr;
996
997 mmc_set_clock(card->host, max_dtr);
998 }
999
1000 /*
1001 * Select the bus width amoung 4-bit and 8-bit(SDR).
1002 * If the bus width is changed successfully, return the selected width value.
1003 * Zero is returned instead of error value if the wide width is not supported.
1004 */
mmc_select_bus_width(struct mmc_card * card)1005 static int mmc_select_bus_width(struct mmc_card *card)
1006 {
1007 static unsigned ext_csd_bits[] = {
1008 EXT_CSD_BUS_WIDTH_8,
1009 EXT_CSD_BUS_WIDTH_4,
1010 EXT_CSD_BUS_WIDTH_1,
1011 };
1012 static unsigned bus_widths[] = {
1013 MMC_BUS_WIDTH_8,
1014 MMC_BUS_WIDTH_4,
1015 MMC_BUS_WIDTH_1,
1016 };
1017 struct mmc_host *host = card->host;
1018 unsigned idx, bus_width = 0;
1019 int err = 0;
1020
1021 if (!mmc_can_ext_csd(card) ||
1022 !(host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)))
1023 return 0;
1024
1025 idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 0 : 1;
1026
1027 /*
1028 * Unlike SD, MMC cards dont have a configuration register to notify
1029 * supported bus width. So bus test command should be run to identify
1030 * the supported bus width or compare the ext csd values of current
1031 * bus width and ext csd values of 1 bit mode read earlier.
1032 */
1033 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
1034 /*
1035 * Host is capable of 8bit transfer, then switch
1036 * the device to work in 8bit transfer mode. If the
1037 * mmc switch command returns error then switch to
1038 * 4bit transfer mode. On success set the corresponding
1039 * bus width on the host.
1040 */
1041 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1042 EXT_CSD_BUS_WIDTH,
1043 ext_csd_bits[idx],
1044 card->ext_csd.generic_cmd6_time);
1045 if (err)
1046 continue;
1047
1048 bus_width = bus_widths[idx];
1049 mmc_set_bus_width(host, bus_width);
1050
1051 /*
1052 * If controller can't handle bus width test,
1053 * compare ext_csd previously read in 1 bit mode
1054 * against ext_csd at new bus width
1055 */
1056 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1057 err = mmc_compare_ext_csds(card, bus_width);
1058 else
1059 err = mmc_bus_test(card, bus_width);
1060
1061 if (!err) {
1062 err = bus_width;
1063 break;
1064 } else {
1065 pr_warn("%s: switch to bus width %d failed\n",
1066 mmc_hostname(host), 1 << bus_width);
1067 }
1068 }
1069
1070 return err;
1071 }
1072
1073 /*
1074 * Switch to the high-speed mode
1075 */
mmc_select_hs(struct mmc_card * card)1076 static int mmc_select_hs(struct mmc_card *card)
1077 {
1078 int err;
1079
1080 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1081 EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
1082 card->ext_csd.generic_cmd6_time, MMC_TIMING_MMC_HS,
1083 true, true, MMC_CMD_RETRIES);
1084 if (err)
1085 pr_warn("%s: switch to high-speed failed, err:%d\n",
1086 mmc_hostname(card->host), err);
1087
1088 return err;
1089 }
1090
1091 /*
1092 * Activate wide bus and DDR if supported.
1093 */
mmc_select_hs_ddr(struct mmc_card * card)1094 static int mmc_select_hs_ddr(struct mmc_card *card)
1095 {
1096 struct mmc_host *host = card->host;
1097 u32 bus_width, ext_csd_bits;
1098 int err = 0;
1099
1100 if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52))
1101 return 0;
1102
1103 bus_width = host->ios.bus_width;
1104 if (bus_width == MMC_BUS_WIDTH_1)
1105 return 0;
1106
1107 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1108 EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
1109
1110 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1111 EXT_CSD_BUS_WIDTH,
1112 ext_csd_bits,
1113 card->ext_csd.generic_cmd6_time,
1114 MMC_TIMING_MMC_DDR52,
1115 true, true, MMC_CMD_RETRIES);
1116 if (err) {
1117 pr_err("%s: switch to bus width %d ddr failed\n",
1118 mmc_hostname(host), 1 << bus_width);
1119 return err;
1120 }
1121
1122 /*
1123 * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1124 * signaling.
1125 *
1126 * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1127 *
1128 * 1.8V vccq at 3.3V core voltage (vcc) is not required
1129 * in the JEDEC spec for DDR.
1130 *
1131 * Even (e)MMC card can support 3.3v to 1.2v vccq, but not all
1132 * host controller can support this, like some of the SDHCI
1133 * controller which connect to an eMMC device. Some of these
1134 * host controller still needs to use 1.8v vccq for supporting
1135 * DDR mode.
1136 *
1137 * So the sequence will be:
1138 * if (host and device can both support 1.2v IO)
1139 * use 1.2v IO;
1140 * else if (host and device can both support 1.8v IO)
1141 * use 1.8v IO;
1142 * so if host and device can only support 3.3v IO, this is the
1143 * last choice.
1144 *
1145 * WARNING: eMMC rules are NOT the same as SD DDR
1146 */
1147 if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
1148 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1149 if (!err)
1150 return 0;
1151 }
1152
1153 if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_8V &&
1154 host->caps & MMC_CAP_1_8V_DDR)
1155 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1156
1157 /* make sure vccq is 3.3v after switching disaster */
1158 if (err)
1159 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
1160
1161 return err;
1162 }
1163
mmc_select_hs400(struct mmc_card * card)1164 static int mmc_select_hs400(struct mmc_card *card)
1165 {
1166 struct mmc_host *host = card->host;
1167 unsigned int max_dtr;
1168 int err = 0;
1169 u8 val;
1170
1171 /*
1172 * HS400 mode requires 8-bit bus width
1173 */
1174 if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1175 host->ios.bus_width == MMC_BUS_WIDTH_8))
1176 return 0;
1177
1178 /* Switch card to HS mode */
1179 val = EXT_CSD_TIMING_HS;
1180 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1181 EXT_CSD_HS_TIMING, val,
1182 card->ext_csd.generic_cmd6_time, 0,
1183 false, true, MMC_CMD_RETRIES);
1184 if (err) {
1185 pr_err("%s: switch to high-speed from hs200 failed, err:%d\n",
1186 mmc_hostname(host), err);
1187 return err;
1188 }
1189
1190 /* Prepare host to downgrade to HS timing */
1191 if (host->ops->hs400_downgrade)
1192 host->ops->hs400_downgrade(host);
1193
1194 /* Set host controller to HS timing */
1195 mmc_set_timing(host, MMC_TIMING_MMC_HS);
1196
1197 /* Reduce frequency to HS frequency */
1198 max_dtr = card->ext_csd.hs_max_dtr;
1199 mmc_set_clock(host, max_dtr);
1200
1201 err = mmc_switch_status(card, true);
1202 if (err)
1203 goto out_err;
1204
1205 if (host->ops->hs400_prepare_ddr)
1206 host->ops->hs400_prepare_ddr(host);
1207
1208 /* Switch card to DDR */
1209 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1210 EXT_CSD_BUS_WIDTH,
1211 EXT_CSD_DDR_BUS_WIDTH_8,
1212 card->ext_csd.generic_cmd6_time);
1213 if (err) {
1214 pr_err("%s: switch to bus width for hs400 failed, err:%d\n",
1215 mmc_hostname(host), err);
1216 return err;
1217 }
1218
1219 /* Switch card to HS400 */
1220 val = EXT_CSD_TIMING_HS400 |
1221 card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1222 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1223 EXT_CSD_HS_TIMING, val,
1224 card->ext_csd.generic_cmd6_time, 0,
1225 false, true, MMC_CMD_RETRIES);
1226 if (err) {
1227 pr_err("%s: switch to hs400 failed, err:%d\n",
1228 mmc_hostname(host), err);
1229 return err;
1230 }
1231
1232 /* Set host controller to HS400 timing and frequency */
1233 mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1234 mmc_set_bus_speed(card);
1235
1236 if (host->ops->execute_hs400_tuning) {
1237 mmc_retune_disable(host);
1238 err = host->ops->execute_hs400_tuning(host, card);
1239 mmc_retune_enable(host);
1240 if (err)
1241 goto out_err;
1242 }
1243
1244 if (host->ops->hs400_complete)
1245 host->ops->hs400_complete(host);
1246
1247 err = mmc_switch_status(card, true);
1248 if (err)
1249 goto out_err;
1250
1251 return 0;
1252
1253 out_err:
1254 pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1255 __func__, err);
1256 return err;
1257 }
1258
mmc_hs200_to_hs400(struct mmc_card * card)1259 int mmc_hs200_to_hs400(struct mmc_card *card)
1260 {
1261 return mmc_select_hs400(card);
1262 }
1263
mmc_hs400_to_hs200(struct mmc_card * card)1264 int mmc_hs400_to_hs200(struct mmc_card *card)
1265 {
1266 struct mmc_host *host = card->host;
1267 unsigned int max_dtr;
1268 int err;
1269 u8 val;
1270
1271 /* Reduce frequency to HS */
1272 max_dtr = card->ext_csd.hs_max_dtr;
1273 mmc_set_clock(host, max_dtr);
1274
1275 /* Switch HS400 to HS DDR */
1276 val = EXT_CSD_TIMING_HS;
1277 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1278 val, card->ext_csd.generic_cmd6_time, 0,
1279 false, true, MMC_CMD_RETRIES);
1280 if (err)
1281 goto out_err;
1282
1283 if (host->ops->hs400_downgrade)
1284 host->ops->hs400_downgrade(host);
1285
1286 mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
1287
1288 err = mmc_switch_status(card, true);
1289 if (err)
1290 goto out_err;
1291
1292 /* Switch HS DDR to HS */
1293 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH,
1294 EXT_CSD_BUS_WIDTH_8, card->ext_csd.generic_cmd6_time,
1295 0, false, true, MMC_CMD_RETRIES);
1296 if (err)
1297 goto out_err;
1298
1299 mmc_set_timing(host, MMC_TIMING_MMC_HS);
1300
1301 err = mmc_switch_status(card, true);
1302 if (err)
1303 goto out_err;
1304
1305 /* Switch HS to HS200 */
1306 val = EXT_CSD_TIMING_HS200 |
1307 card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1308 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1309 val, card->ext_csd.generic_cmd6_time, 0,
1310 false, true, MMC_CMD_RETRIES);
1311 if (err)
1312 goto out_err;
1313
1314 mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1315
1316 /*
1317 * For HS200, CRC errors are not a reliable way to know the switch
1318 * failed. If there really is a problem, we would expect tuning will
1319 * fail and the result ends up the same.
1320 */
1321 err = mmc_switch_status(card, false);
1322 if (err)
1323 goto out_err;
1324
1325 mmc_set_bus_speed(card);
1326
1327 /* Prepare tuning for HS400 mode. */
1328 if (host->ops->prepare_hs400_tuning)
1329 host->ops->prepare_hs400_tuning(host, &host->ios);
1330
1331 return 0;
1332
1333 out_err:
1334 pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1335 __func__, err);
1336 return err;
1337 }
1338
mmc_select_driver_type(struct mmc_card * card)1339 static void mmc_select_driver_type(struct mmc_card *card)
1340 {
1341 int card_drv_type, drive_strength, drv_type = 0;
1342 int fixed_drv_type = card->host->fixed_drv_type;
1343
1344 card_drv_type = card->ext_csd.raw_driver_strength |
1345 mmc_driver_type_mask(0);
1346
1347 if (fixed_drv_type >= 0)
1348 drive_strength = card_drv_type & mmc_driver_type_mask(fixed_drv_type)
1349 ? fixed_drv_type : 0;
1350 else
1351 drive_strength = mmc_select_drive_strength(card,
1352 card->ext_csd.hs200_max_dtr,
1353 card_drv_type, &drv_type);
1354
1355 card->drive_strength = drive_strength;
1356
1357 if (drv_type)
1358 mmc_set_driver_type(card->host, drv_type);
1359 }
1360
mmc_select_hs400es(struct mmc_card * card)1361 static int mmc_select_hs400es(struct mmc_card *card)
1362 {
1363 struct mmc_host *host = card->host;
1364 int err = -EINVAL;
1365 u8 val;
1366
1367 if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_2V)
1368 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1369
1370 if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_8V)
1371 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1372
1373 /* If fails try again during next card power cycle */
1374 if (err)
1375 goto out_err;
1376
1377 err = mmc_select_bus_width(card);
1378 if (err != MMC_BUS_WIDTH_8) {
1379 pr_err("%s: switch to 8bit bus width failed, err:%d\n",
1380 mmc_hostname(host), err);
1381 err = err < 0 ? err : -ENOTSUPP;
1382 goto out_err;
1383 }
1384
1385 /* Switch card to HS mode */
1386 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1387 EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
1388 card->ext_csd.generic_cmd6_time, 0,
1389 false, true, MMC_CMD_RETRIES);
1390 if (err) {
1391 pr_err("%s: switch to hs for hs400es failed, err:%d\n",
1392 mmc_hostname(host), err);
1393 goto out_err;
1394 }
1395
1396 /*
1397 * Bump to HS timing and frequency. Some cards don't handle
1398 * SEND_STATUS reliably at the initial frequency.
1399 */
1400 mmc_set_timing(host, MMC_TIMING_MMC_HS);
1401 mmc_set_bus_speed(card);
1402
1403 err = mmc_switch_status(card, true);
1404 if (err)
1405 goto out_err;
1406
1407 /* Switch card to DDR with strobe bit */
1408 val = EXT_CSD_DDR_BUS_WIDTH_8 | EXT_CSD_BUS_WIDTH_STROBE;
1409 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1410 EXT_CSD_BUS_WIDTH,
1411 val,
1412 card->ext_csd.generic_cmd6_time);
1413 if (err) {
1414 pr_err("%s: switch to bus width for hs400es failed, err:%d\n",
1415 mmc_hostname(host), err);
1416 goto out_err;
1417 }
1418
1419 mmc_select_driver_type(card);
1420
1421 /* Switch card to HS400 */
1422 val = EXT_CSD_TIMING_HS400 |
1423 card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1424 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1425 EXT_CSD_HS_TIMING, val,
1426 card->ext_csd.generic_cmd6_time, 0,
1427 false, true, MMC_CMD_RETRIES);
1428 if (err) {
1429 pr_err("%s: switch to hs400es failed, err:%d\n",
1430 mmc_hostname(host), err);
1431 goto out_err;
1432 }
1433
1434 /* Set host controller to HS400 timing and frequency */
1435 mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1436
1437 /* Controller enable enhanced strobe function */
1438 host->ios.enhanced_strobe = true;
1439 if (host->ops->hs400_enhanced_strobe)
1440 host->ops->hs400_enhanced_strobe(host, &host->ios);
1441
1442 err = mmc_switch_status(card, true);
1443 if (err)
1444 goto out_err;
1445
1446 return 0;
1447
1448 out_err:
1449 pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1450 __func__, err);
1451 return err;
1452 }
1453
1454 /*
1455 * For device supporting HS200 mode, the following sequence
1456 * should be done before executing the tuning process.
1457 * 1. set the desired bus width(4-bit or 8-bit, 1-bit is not supported)
1458 * 2. switch to HS200 mode
1459 * 3. set the clock to > 52Mhz and <=200MHz
1460 */
mmc_select_hs200(struct mmc_card * card)1461 static int mmc_select_hs200(struct mmc_card *card)
1462 {
1463 struct mmc_host *host = card->host;
1464 unsigned int old_timing, old_signal_voltage, old_clock;
1465 int err = -EINVAL;
1466 u8 val;
1467
1468 old_signal_voltage = host->ios.signal_voltage;
1469 if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
1470 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1471
1472 if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
1473 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1474
1475 /* If fails try again during next card power cycle */
1476 if (err)
1477 return err;
1478
1479 mmc_select_driver_type(card);
1480
1481 /*
1482 * Set the bus width(4 or 8) with host's support and
1483 * switch to HS200 mode if bus width is set successfully.
1484 */
1485 err = mmc_select_bus_width(card);
1486 if (err > 0) {
1487 val = EXT_CSD_TIMING_HS200 |
1488 card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1489 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1490 EXT_CSD_HS_TIMING, val,
1491 card->ext_csd.generic_cmd6_time, 0,
1492 false, true, MMC_CMD_RETRIES);
1493 if (err)
1494 goto err;
1495
1496 /*
1497 * Bump to HS timing and frequency. Some cards don't handle
1498 * SEND_STATUS reliably at the initial frequency.
1499 * NB: We can't move to full (HS200) speeds until after we've
1500 * successfully switched over.
1501 */
1502 old_timing = host->ios.timing;
1503 old_clock = host->ios.clock;
1504 mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1505 mmc_set_clock(card->host, card->ext_csd.hs_max_dtr);
1506
1507 /*
1508 * For HS200, CRC errors are not a reliable way to know the
1509 * switch failed. If there really is a problem, we would expect
1510 * tuning will fail and the result ends up the same.
1511 */
1512 err = mmc_switch_status(card, false);
1513
1514 /*
1515 * mmc_select_timing() assumes timing has not changed if
1516 * it is a switch error.
1517 */
1518 if (err == -EBADMSG) {
1519 mmc_set_clock(host, old_clock);
1520 mmc_set_timing(host, old_timing);
1521 }
1522 }
1523 err:
1524 if (err) {
1525 /* fall back to the old signal voltage, if fails report error */
1526 if (mmc_set_signal_voltage(host, old_signal_voltage))
1527 err = -EIO;
1528
1529 pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1530 __func__, err);
1531 }
1532 return err;
1533 }
1534
1535 /*
1536 * Activate High Speed, HS200 or HS400ES mode if supported.
1537 */
mmc_select_timing(struct mmc_card * card)1538 static int mmc_select_timing(struct mmc_card *card)
1539 {
1540 int err = 0;
1541
1542 if (!mmc_can_ext_csd(card))
1543 goto bus_speed;
1544
1545 if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400ES) {
1546 err = mmc_select_hs400es(card);
1547 goto out;
1548 }
1549
1550 if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200) {
1551 err = mmc_select_hs200(card);
1552 if (err == -EBADMSG)
1553 card->mmc_avail_type &= ~EXT_CSD_CARD_TYPE_HS200;
1554 else
1555 goto out;
1556 }
1557
1558 if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
1559 err = mmc_select_hs(card);
1560
1561 out:
1562 if (err && err != -EBADMSG)
1563 return err;
1564
1565 bus_speed:
1566 /*
1567 * Set the bus speed to the selected bus timing.
1568 * If timing is not selected, backward compatible is the default.
1569 */
1570 mmc_set_bus_speed(card);
1571 return 0;
1572 }
1573
1574 /*
1575 * Execute tuning sequence to seek the proper bus operating
1576 * conditions for HS200 and HS400, which sends CMD21 to the device.
1577 */
mmc_hs200_tuning(struct mmc_card * card)1578 static int mmc_hs200_tuning(struct mmc_card *card)
1579 {
1580 struct mmc_host *host = card->host;
1581
1582 /*
1583 * Timing should be adjusted to the HS400 target
1584 * operation frequency for tuning process
1585 */
1586 if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1587 host->ios.bus_width == MMC_BUS_WIDTH_8)
1588 if (host->ops->prepare_hs400_tuning)
1589 host->ops->prepare_hs400_tuning(host, &host->ios);
1590
1591 return mmc_execute_tuning(card);
1592 }
1593
1594 /*
1595 * Handle the detection and initialisation of a card.
1596 *
1597 * In the case of a resume, "oldcard" will contain the card
1598 * we're trying to reinitialise.
1599 */
mmc_init_card(struct mmc_host * host,u32 ocr,struct mmc_card * oldcard)1600 static int mmc_init_card(struct mmc_host *host, u32 ocr,
1601 struct mmc_card *oldcard)
1602 {
1603 struct mmc_card *card;
1604 int err;
1605 u32 cid[4];
1606 u32 rocr;
1607
1608 WARN_ON(!host->claimed);
1609
1610 /* Set correct bus mode for MMC before attempting init */
1611 if (!mmc_host_is_spi(host))
1612 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1613
1614 /*
1615 * Since we're changing the OCR value, we seem to
1616 * need to tell some cards to go back to the idle
1617 * state. We wait 1ms to give cards time to
1618 * respond.
1619 * mmc_go_idle is needed for eMMC that are asleep
1620 */
1621 mmc_go_idle(host);
1622
1623 /* The extra bit indicates that we support high capacity */
1624 err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
1625 if (err)
1626 goto err;
1627
1628 /*
1629 * For SPI, enable CRC as appropriate.
1630 */
1631 if (mmc_host_is_spi(host)) {
1632 err = mmc_spi_set_crc(host, use_spi_crc);
1633 if (err)
1634 goto err;
1635 }
1636
1637 /*
1638 * Fetch CID from card.
1639 */
1640 err = mmc_send_cid(host, cid);
1641 if (err)
1642 goto err;
1643
1644 if (oldcard) {
1645 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
1646 pr_debug("%s: Perhaps the card was replaced\n",
1647 mmc_hostname(host));
1648 err = -ENOENT;
1649 goto err;
1650 }
1651
1652 card = oldcard;
1653 } else {
1654 /*
1655 * Allocate card structure.
1656 */
1657 card = mmc_alloc_card(host, &mmc_type);
1658 if (IS_ERR(card)) {
1659 err = PTR_ERR(card);
1660 goto err;
1661 }
1662
1663 card->ocr = ocr;
1664 card->type = MMC_TYPE_MMC;
1665 card->rca = 1;
1666 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
1667 }
1668
1669 /*
1670 * Call the optional HC's init_card function to handle quirks.
1671 */
1672 if (host->ops->init_card)
1673 host->ops->init_card(host, card);
1674
1675 /*
1676 * For native busses: set card RCA and quit open drain mode.
1677 */
1678 if (!mmc_host_is_spi(host)) {
1679 err = mmc_set_relative_addr(card);
1680 if (err)
1681 goto free_card;
1682
1683 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
1684 }
1685
1686 if (!oldcard) {
1687 /*
1688 * Fetch CSD from card.
1689 */
1690 err = mmc_send_csd(card, card->raw_csd);
1691 if (err)
1692 goto free_card;
1693
1694 err = mmc_decode_csd(card);
1695 if (err)
1696 goto free_card;
1697 err = mmc_decode_cid(card);
1698 if (err)
1699 goto free_card;
1700 }
1701
1702 /*
1703 * handling only for cards supporting DSR and hosts requesting
1704 * DSR configuration
1705 */
1706 if (card->csd.dsr_imp && host->dsr_req)
1707 mmc_set_dsr(host);
1708
1709 /*
1710 * Select card, as all following commands rely on that.
1711 */
1712 if (!mmc_host_is_spi(host)) {
1713 err = mmc_select_card(card);
1714 if (err)
1715 goto free_card;
1716 }
1717
1718 if (!oldcard) {
1719 /* Read extended CSD. */
1720 err = mmc_read_ext_csd(card);
1721 if (err)
1722 goto free_card;
1723
1724 /*
1725 * If doing byte addressing, check if required to do sector
1726 * addressing. Handle the case of <2GB cards needing sector
1727 * addressing. See section 8.1 JEDEC Standard JED84-A441;
1728 * ocr register has bit 30 set for sector addressing.
1729 */
1730 if (rocr & BIT(30))
1731 mmc_card_set_blockaddr(card);
1732
1733 /* Erase size depends on CSD and Extended CSD */
1734 mmc_set_erase_size(card);
1735 }
1736
1737 /* Enable ERASE_GRP_DEF. This bit is lost after a reset or power off. */
1738 if (card->ext_csd.rev >= 3) {
1739 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1740 EXT_CSD_ERASE_GROUP_DEF, 1,
1741 card->ext_csd.generic_cmd6_time);
1742
1743 if (err && err != -EBADMSG)
1744 goto free_card;
1745
1746 if (err) {
1747 /*
1748 * Just disable enhanced area off & sz
1749 * will try to enable ERASE_GROUP_DEF
1750 * during next time reinit
1751 */
1752 card->ext_csd.enhanced_area_offset = -EINVAL;
1753 card->ext_csd.enhanced_area_size = -EINVAL;
1754 } else {
1755 card->ext_csd.erase_group_def = 1;
1756 /*
1757 * enable ERASE_GRP_DEF successfully.
1758 * This will affect the erase size, so
1759 * here need to reset erase size
1760 */
1761 mmc_set_erase_size(card);
1762 }
1763 }
1764
1765 /*
1766 * Ensure eMMC user default partition is enabled
1767 */
1768 if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
1769 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
1770 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
1771 card->ext_csd.part_config,
1772 card->ext_csd.part_time);
1773 if (err && err != -EBADMSG)
1774 goto free_card;
1775 }
1776
1777 /*
1778 * Enable power_off_notification byte in the ext_csd register
1779 */
1780 if (card->ext_csd.rev >= 6) {
1781 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1782 EXT_CSD_POWER_OFF_NOTIFICATION,
1783 EXT_CSD_POWER_ON,
1784 card->ext_csd.generic_cmd6_time);
1785 if (err && err != -EBADMSG)
1786 goto free_card;
1787
1788 /*
1789 * The err can be -EBADMSG or 0,
1790 * so check for success and update the flag
1791 */
1792 if (!err)
1793 card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
1794 }
1795
1796 /* set erase_arg */
1797 if (mmc_can_discard(card))
1798 card->erase_arg = MMC_DISCARD_ARG;
1799 else if (mmc_can_trim(card))
1800 card->erase_arg = MMC_TRIM_ARG;
1801 else
1802 card->erase_arg = MMC_ERASE_ARG;
1803
1804 /*
1805 * Select timing interface
1806 */
1807 err = mmc_select_timing(card);
1808 if (err)
1809 goto free_card;
1810
1811 if (mmc_card_hs200(card)) {
1812 host->doing_init_tune = 1;
1813
1814 err = mmc_hs200_tuning(card);
1815 if (!err)
1816 err = mmc_select_hs400(card);
1817
1818 host->doing_init_tune = 0;
1819
1820 if (err)
1821 goto free_card;
1822
1823 } else if (!mmc_card_hs400es(card)) {
1824 /* Select the desired bus width optionally */
1825 err = mmc_select_bus_width(card);
1826 if (err > 0 && mmc_card_hs(card)) {
1827 err = mmc_select_hs_ddr(card);
1828 if (err)
1829 goto free_card;
1830 }
1831 }
1832
1833 /*
1834 * Choose the power class with selected bus interface
1835 */
1836 mmc_select_powerclass(card);
1837
1838 /*
1839 * Enable HPI feature (if supported)
1840 */
1841 if (card->ext_csd.hpi) {
1842 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1843 EXT_CSD_HPI_MGMT, 1,
1844 card->ext_csd.generic_cmd6_time);
1845 if (err && err != -EBADMSG)
1846 goto free_card;
1847 if (err) {
1848 pr_warn("%s: Enabling HPI failed\n",
1849 mmc_hostname(card->host));
1850 card->ext_csd.hpi_en = 0;
1851 } else {
1852 card->ext_csd.hpi_en = 1;
1853 }
1854 }
1855
1856 /*
1857 * If cache size is higher than 0, this indicates the existence of cache
1858 * and it can be turned on. Note that some eMMCs from Micron has been
1859 * reported to need ~800 ms timeout, while enabling the cache after
1860 * sudden power failure tests. Let's extend the timeout to a minimum of
1861 * DEFAULT_CACHE_EN_TIMEOUT_MS and do it for all cards.
1862 */
1863 if (card->ext_csd.cache_size > 0) {
1864 unsigned int timeout_ms = MIN_CACHE_EN_TIMEOUT_MS;
1865
1866 timeout_ms = max(card->ext_csd.generic_cmd6_time, timeout_ms);
1867 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1868 EXT_CSD_CACHE_CTRL, 1, timeout_ms);
1869 if (err && err != -EBADMSG)
1870 goto free_card;
1871
1872 /*
1873 * Only if no error, cache is turned on successfully.
1874 */
1875 if (err) {
1876 pr_warn("%s: Cache is supported, but failed to turn on (%d)\n",
1877 mmc_hostname(card->host), err);
1878 card->ext_csd.cache_ctrl = 0;
1879 } else {
1880 card->ext_csd.cache_ctrl = 1;
1881 }
1882 }
1883
1884 /*
1885 * Enable Command Queue if supported. Note that Packed Commands cannot
1886 * be used with Command Queue.
1887 */
1888 card->ext_csd.cmdq_en = false;
1889 if (card->ext_csd.cmdq_support && host->caps2 & MMC_CAP2_CQE) {
1890 err = mmc_cmdq_enable(card);
1891 if (err && err != -EBADMSG)
1892 goto free_card;
1893 if (err) {
1894 pr_warn("%s: Enabling CMDQ failed\n",
1895 mmc_hostname(card->host));
1896 card->ext_csd.cmdq_support = false;
1897 card->ext_csd.cmdq_depth = 0;
1898 }
1899 }
1900 /*
1901 * In some cases (e.g. RPMB or mmc_test), the Command Queue must be
1902 * disabled for a time, so a flag is needed to indicate to re-enable the
1903 * Command Queue.
1904 */
1905 card->reenable_cmdq = card->ext_csd.cmdq_en;
1906
1907 if (host->cqe_ops && !host->cqe_enabled) {
1908 err = host->cqe_ops->cqe_enable(host, card);
1909 if (!err) {
1910 host->cqe_enabled = true;
1911
1912 if (card->ext_csd.cmdq_en) {
1913 pr_info("%s: Command Queue Engine enabled\n",
1914 mmc_hostname(host));
1915 } else {
1916 host->hsq_enabled = true;
1917 pr_info("%s: Host Software Queue enabled\n",
1918 mmc_hostname(host));
1919 }
1920 }
1921 }
1922
1923 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
1924 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1925 pr_err("%s: Host failed to negotiate down from 3.3V\n",
1926 mmc_hostname(host));
1927 err = -EINVAL;
1928 goto free_card;
1929 }
1930
1931 if (!oldcard)
1932 host->card = card;
1933
1934 return 0;
1935
1936 free_card:
1937 if (!oldcard)
1938 mmc_remove_card(card);
1939 err:
1940 return err;
1941 }
1942
mmc_can_sleep(struct mmc_card * card)1943 static int mmc_can_sleep(struct mmc_card *card)
1944 {
1945 return card->ext_csd.rev >= 3;
1946 }
1947
mmc_sleep_busy_cb(void * cb_data,bool * busy)1948 static int mmc_sleep_busy_cb(void *cb_data, bool *busy)
1949 {
1950 struct mmc_host *host = cb_data;
1951
1952 *busy = host->ops->card_busy(host);
1953 return 0;
1954 }
1955
mmc_sleep(struct mmc_host * host)1956 static int mmc_sleep(struct mmc_host *host)
1957 {
1958 struct mmc_command cmd = {};
1959 struct mmc_card *card = host->card;
1960 unsigned int timeout_ms = DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000);
1961 bool use_r1b_resp;
1962 int err;
1963
1964 /* Re-tuning can't be done once the card is deselected */
1965 mmc_retune_hold(host);
1966
1967 err = mmc_deselect_cards(host);
1968 if (err)
1969 goto out_release;
1970
1971 cmd.opcode = MMC_SLEEP_AWAKE;
1972 cmd.arg = card->rca << 16;
1973 cmd.arg |= 1 << 15;
1974 use_r1b_resp = mmc_prepare_busy_cmd(host, &cmd, timeout_ms);
1975
1976 err = mmc_wait_for_cmd(host, &cmd, 0);
1977 if (err)
1978 goto out_release;
1979
1980 /*
1981 * If the host does not wait while the card signals busy, then we can
1982 * try to poll, but only if the host supports HW polling, as the
1983 * SEND_STATUS cmd is not allowed. If we can't poll, then we simply need
1984 * to wait the sleep/awake timeout.
1985 */
1986 if (host->caps & MMC_CAP_WAIT_WHILE_BUSY && use_r1b_resp)
1987 goto out_release;
1988
1989 if (!host->ops->card_busy) {
1990 mmc_delay(timeout_ms);
1991 goto out_release;
1992 }
1993
1994 err = __mmc_poll_for_busy(host, 0, timeout_ms, &mmc_sleep_busy_cb, host);
1995
1996 out_release:
1997 mmc_retune_release(host);
1998 return err;
1999 }
2000
mmc_can_poweroff_notify(const struct mmc_card * card)2001 static int mmc_can_poweroff_notify(const struct mmc_card *card)
2002 {
2003 return card &&
2004 mmc_card_mmc(card) &&
2005 (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
2006 }
2007
mmc_poweroff_notify(struct mmc_card * card,unsigned int notify_type)2008 static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
2009 {
2010 unsigned int timeout = card->ext_csd.generic_cmd6_time;
2011 int err;
2012
2013 /* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
2014 if (notify_type == EXT_CSD_POWER_OFF_LONG)
2015 timeout = card->ext_csd.power_off_longtime;
2016
2017 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2018 EXT_CSD_POWER_OFF_NOTIFICATION,
2019 notify_type, timeout, 0, false, false, MMC_CMD_RETRIES);
2020 if (err)
2021 pr_err("%s: Power Off Notification timed out, %u\n",
2022 mmc_hostname(card->host), timeout);
2023
2024 /* Disable the power off notification after the switch operation. */
2025 card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
2026
2027 return err;
2028 }
2029
2030 /*
2031 * Host is being removed. Free up the current card.
2032 */
mmc_remove(struct mmc_host * host)2033 static void mmc_remove(struct mmc_host *host)
2034 {
2035 mmc_remove_card(host->card);
2036 host->card = NULL;
2037 }
2038
2039 /*
2040 * Card detection - card is alive.
2041 */
mmc_alive(struct mmc_host * host)2042 static int mmc_alive(struct mmc_host *host)
2043 {
2044 return mmc_send_status(host->card, NULL);
2045 }
2046
2047 /*
2048 * Card detection callback from host.
2049 */
mmc_detect(struct mmc_host * host)2050 static void mmc_detect(struct mmc_host *host)
2051 {
2052 int err;
2053
2054 mmc_get_card(host->card, NULL);
2055
2056 /*
2057 * Just check if our card has been removed.
2058 */
2059 err = _mmc_detect_card_removed(host);
2060
2061 mmc_put_card(host->card, NULL);
2062
2063 if (err) {
2064 mmc_remove(host);
2065
2066 mmc_claim_host(host);
2067 mmc_detach_bus(host);
2068 mmc_power_off(host);
2069 mmc_release_host(host);
2070 }
2071 }
2072
_mmc_cache_enabled(struct mmc_host * host)2073 static bool _mmc_cache_enabled(struct mmc_host *host)
2074 {
2075 return host->card->ext_csd.cache_size > 0 &&
2076 host->card->ext_csd.cache_ctrl & 1;
2077 }
2078
2079 /*
2080 * Flush the internal cache of the eMMC to non-volatile storage.
2081 */
_mmc_flush_cache(struct mmc_host * host)2082 static int _mmc_flush_cache(struct mmc_host *host)
2083 {
2084 int err = 0;
2085
2086 if (mmc_card_broken_cache_flush(host->card) && !host->card->written_flag)
2087 return 0;
2088
2089 if (_mmc_cache_enabled(host)) {
2090 err = mmc_switch(host->card, EXT_CSD_CMD_SET_NORMAL,
2091 EXT_CSD_FLUSH_CACHE, 1,
2092 CACHE_FLUSH_TIMEOUT_MS);
2093 if (err)
2094 pr_err("%s: cache flush error %d\n", mmc_hostname(host), err);
2095 else
2096 host->card->written_flag = false;
2097 }
2098
2099 return err;
2100 }
2101
_mmc_suspend(struct mmc_host * host,bool is_suspend)2102 static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
2103 {
2104 int err = 0;
2105 unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
2106 EXT_CSD_POWER_OFF_LONG;
2107
2108 mmc_claim_host(host);
2109
2110 if (mmc_card_suspended(host->card))
2111 goto out;
2112
2113 err = _mmc_flush_cache(host);
2114 if (err)
2115 goto out;
2116
2117 if (mmc_can_poweroff_notify(host->card) &&
2118 ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend ||
2119 (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE_IN_SUSPEND)))
2120 err = mmc_poweroff_notify(host->card, notify_type);
2121 else if (mmc_can_sleep(host->card))
2122 err = mmc_sleep(host);
2123 else if (!mmc_host_is_spi(host))
2124 err = mmc_deselect_cards(host);
2125
2126 if (!err) {
2127 mmc_power_off(host);
2128 mmc_card_set_suspended(host->card);
2129 }
2130 out:
2131 mmc_release_host(host);
2132 return err;
2133 }
2134
2135 /*
2136 * Suspend callback
2137 */
mmc_suspend(struct mmc_host * host)2138 static int mmc_suspend(struct mmc_host *host)
2139 {
2140 int err;
2141
2142 err = _mmc_suspend(host, true);
2143 if (!err) {
2144 pm_runtime_disable(&host->card->dev);
2145 pm_runtime_set_suspended(&host->card->dev);
2146 }
2147
2148 return err;
2149 }
2150
2151 /*
2152 * This function tries to determine if the same card is still present
2153 * and, if so, restore all state to it.
2154 */
_mmc_resume(struct mmc_host * host)2155 static int _mmc_resume(struct mmc_host *host)
2156 {
2157 int err = 0;
2158
2159 mmc_claim_host(host);
2160
2161 if (!mmc_card_suspended(host->card))
2162 goto out;
2163
2164 mmc_power_up(host, host->card->ocr);
2165 err = mmc_init_card(host, host->card->ocr, host->card);
2166 mmc_card_clr_suspended(host->card);
2167
2168 out:
2169 mmc_release_host(host);
2170 return err;
2171 }
2172
2173 /*
2174 * Shutdown callback
2175 */
mmc_shutdown(struct mmc_host * host)2176 static int mmc_shutdown(struct mmc_host *host)
2177 {
2178 int err = 0;
2179
2180 /*
2181 * In a specific case for poweroff notify, we need to resume the card
2182 * before we can shutdown it properly.
2183 */
2184 if (mmc_can_poweroff_notify(host->card) &&
2185 !(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE))
2186 err = _mmc_resume(host);
2187
2188 if (!err)
2189 err = _mmc_suspend(host, false);
2190
2191 return err;
2192 }
2193
2194 /*
2195 * Callback for resume.
2196 */
mmc_resume(struct mmc_host * host)2197 static int mmc_resume(struct mmc_host *host)
2198 {
2199 pm_runtime_enable(&host->card->dev);
2200 return 0;
2201 }
2202
2203 /*
2204 * Callback for runtime_suspend.
2205 */
mmc_runtime_suspend(struct mmc_host * host)2206 static int mmc_runtime_suspend(struct mmc_host *host)
2207 {
2208 int err;
2209
2210 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
2211 return 0;
2212
2213 err = _mmc_suspend(host, true);
2214 if (err)
2215 pr_err("%s: error %d doing aggressive suspend\n",
2216 mmc_hostname(host), err);
2217
2218 return err;
2219 }
2220
2221 /*
2222 * Callback for runtime_resume.
2223 */
mmc_runtime_resume(struct mmc_host * host)2224 static int mmc_runtime_resume(struct mmc_host *host)
2225 {
2226 int err;
2227
2228 err = _mmc_resume(host);
2229 if (err && err != -ENOMEDIUM)
2230 pr_err("%s: error %d doing runtime resume\n",
2231 mmc_hostname(host), err);
2232
2233 return 0;
2234 }
2235
mmc_can_reset(struct mmc_card * card)2236 static int mmc_can_reset(struct mmc_card *card)
2237 {
2238 u8 rst_n_function;
2239
2240 rst_n_function = card->ext_csd.rst_n_function;
2241 if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
2242 return 0;
2243 return 1;
2244 }
2245
_mmc_hw_reset(struct mmc_host * host)2246 static int _mmc_hw_reset(struct mmc_host *host)
2247 {
2248 struct mmc_card *card = host->card;
2249
2250 /*
2251 * In the case of recovery, we can't expect flushing the cache to work
2252 * always, but we have a go and ignore errors.
2253 */
2254 _mmc_flush_cache(host);
2255
2256 if ((host->caps & MMC_CAP_HW_RESET) && host->ops->card_hw_reset &&
2257 mmc_can_reset(card)) {
2258 /* If the card accept RST_n signal, send it. */
2259 mmc_set_clock(host, host->f_init);
2260 host->ops->card_hw_reset(host);
2261 /* Set initial state and call mmc_set_ios */
2262 mmc_set_initial_state(host);
2263 } else {
2264 /* Do a brute force power cycle */
2265 mmc_power_cycle(host, card->ocr);
2266 mmc_pwrseq_reset(host);
2267 }
2268 return mmc_init_card(host, card->ocr, card);
2269 }
2270
2271 static const struct mmc_bus_ops mmc_ops = {
2272 .remove = mmc_remove,
2273 .detect = mmc_detect,
2274 .suspend = mmc_suspend,
2275 .resume = mmc_resume,
2276 .runtime_suspend = mmc_runtime_suspend,
2277 .runtime_resume = mmc_runtime_resume,
2278 .alive = mmc_alive,
2279 .shutdown = mmc_shutdown,
2280 .hw_reset = _mmc_hw_reset,
2281 .cache_enabled = _mmc_cache_enabled,
2282 .flush_cache = _mmc_flush_cache,
2283 };
2284
2285 /*
2286 * Starting point for MMC card init.
2287 */
mmc_attach_mmc(struct mmc_host * host)2288 int mmc_attach_mmc(struct mmc_host *host)
2289 {
2290 int err;
2291 u32 ocr, rocr;
2292
2293 WARN_ON(!host->claimed);
2294
2295 /* Set correct bus mode for MMC before attempting attach */
2296 if (!mmc_host_is_spi(host))
2297 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
2298
2299 err = mmc_send_op_cond(host, 0, &ocr);
2300 if (err)
2301 return err;
2302
2303 mmc_attach_bus(host, &mmc_ops);
2304 if (host->ocr_avail_mmc)
2305 host->ocr_avail = host->ocr_avail_mmc;
2306
2307 /*
2308 * We need to get OCR a different way for SPI.
2309 */
2310 if (mmc_host_is_spi(host)) {
2311 err = mmc_spi_read_ocr(host, 1, &ocr);
2312 if (err)
2313 goto err;
2314 }
2315
2316 rocr = mmc_select_voltage(host, ocr);
2317
2318 /*
2319 * Can we support the voltage of the card?
2320 */
2321 if (!rocr) {
2322 err = -EINVAL;
2323 goto err;
2324 }
2325
2326 /*
2327 * Detect and init the card.
2328 */
2329 err = mmc_init_card(host, rocr, NULL);
2330 if (err)
2331 goto err;
2332
2333 mmc_release_host(host);
2334 err = mmc_add_card(host->card);
2335 if (err)
2336 goto remove_card;
2337
2338 mmc_claim_host(host);
2339 return 0;
2340
2341 remove_card:
2342 mmc_remove_card(host->card);
2343 mmc_claim_host(host);
2344 host->card = NULL;
2345 err:
2346 mmc_detach_bus(host);
2347
2348 pr_err("%s: error %d whilst initialising MMC card\n",
2349 mmc_hostname(host), err);
2350
2351 return err;
2352 }
2353