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