2 * linux/drivers/mmc/core/mmc.c
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
6 * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/err.h>
14 #include <linux/slab.h>
16 #include <linux/mmc/host.h>
17 #include <linux/mmc/card.h>
18 #include <linux/mmc/mmc.h>
25 static const unsigned int tran_exp[] = {
26 10000, 100000, 1000000, 10000000,
30 static const unsigned char tran_mant[] = {
31 0, 10, 12, 13, 15, 20, 25, 30,
32 35, 40, 45, 50, 55, 60, 70, 80,
35 static const unsigned int tacc_exp[] = {
36 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
39 static const unsigned int tacc_mant[] = {
40 0, 10, 12, 13, 15, 20, 25, 30,
41 35, 40, 45, 50, 55, 60, 70, 80,
44 #define UNSTUFF_BITS(resp,start,size) \
46 const int __size = size; \
47 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
48 const int __off = 3 - ((start) / 32); \
49 const int __shft = (start) & 31; \
52 __res = resp[__off] >> __shft; \
53 if (__size + __shft > 32) \
54 __res |= resp[__off-1] << ((32 - __shft) % 32); \
59 * Given the decoded CSD structure, decode the raw CID to our CID structure.
61 static int mmc_decode_cid(struct mmc_card *card)
63 u32 *resp = card->raw_cid;
66 * The selection of the format here is based upon published
67 * specs from sandisk and from what people have reported.
69 switch (card->csd.mmca_vsn) {
70 case 0: /* MMC v1.0 - v1.2 */
71 case 1: /* MMC v1.4 */
72 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
73 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
74 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
75 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
76 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
77 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
78 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
79 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
80 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
81 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
82 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
83 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
84 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
87 case 2: /* MMC v2.0 - v2.2 */
88 case 3: /* MMC v3.1 - v3.3 */
90 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
91 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
92 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
93 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
94 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
95 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
96 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
97 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
98 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
99 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
100 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
104 pr_err("%s: card has unknown MMCA version %d\n",
105 mmc_hostname(card->host), card->csd.mmca_vsn);
112 static void mmc_set_erase_size(struct mmc_card *card)
114 if (card->ext_csd.erase_group_def & 1)
115 card->erase_size = card->ext_csd.hc_erase_size;
117 card->erase_size = card->csd.erase_size;
119 mmc_init_erase(card);
123 * Given a 128-bit response, decode to our card CSD structure.
125 static int mmc_decode_csd(struct mmc_card *card)
127 struct mmc_csd *csd = &card->csd;
128 unsigned int e, m, a, b;
129 u32 *resp = card->raw_csd;
132 * We only understand CSD structure v1.1 and v1.2.
133 * v1.2 has extra information in bits 15, 11 and 10.
134 * We also support eMMC v4.4 & v4.41.
136 csd->structure = UNSTUFF_BITS(resp, 126, 2);
137 if (csd->structure == 0) {
138 pr_err("%s: unrecognised CSD structure version %d\n",
139 mmc_hostname(card->host), csd->structure);
143 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
144 m = UNSTUFF_BITS(resp, 115, 4);
145 e = UNSTUFF_BITS(resp, 112, 3);
146 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
147 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
149 m = UNSTUFF_BITS(resp, 99, 4);
150 e = UNSTUFF_BITS(resp, 96, 3);
151 csd->max_dtr = tran_exp[e] * tran_mant[m];
152 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
154 e = UNSTUFF_BITS(resp, 47, 3);
155 m = UNSTUFF_BITS(resp, 62, 12);
156 csd->capacity = (1 + m) << (e + 2);
158 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
159 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
160 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
161 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
162 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
163 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
164 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
166 if (csd->write_blkbits >= 9) {
167 a = UNSTUFF_BITS(resp, 42, 5);
168 b = UNSTUFF_BITS(resp, 37, 5);
169 csd->erase_size = (a + 1) * (b + 1);
170 csd->erase_size <<= csd->write_blkbits - 9;
179 static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
185 BUG_ON(!new_ext_csd);
189 if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
193 * As the ext_csd is so large and mostly unused, we don't store the
194 * raw block in mmc_card.
196 ext_csd = kmalloc(512, GFP_KERNEL);
198 pr_err("%s: could not allocate a buffer to "
199 "receive the ext_csd.\n", mmc_hostname(card->host));
203 err = mmc_send_ext_csd(card, ext_csd);
208 /* If the host or the card can't do the switch,
209 * fail more gracefully. */
216 * High capacity cards should have this "magic" size
217 * stored in their CSD.
219 if (card->csd.capacity == (4096 * 512)) {
220 pr_err("%s: unable to read EXT_CSD "
221 "on a possible high capacity card. "
222 "Card will be ignored.\n",
223 mmc_hostname(card->host));
225 pr_warning("%s: unable to read "
226 "EXT_CSD, performance might "
228 mmc_hostname(card->host));
232 *new_ext_csd = ext_csd;
238 * Decode extended CSD.
240 static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
243 unsigned int part_size;
244 u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0;
251 /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
252 card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
253 if (card->csd.structure == 3) {
254 if (card->ext_csd.raw_ext_csd_structure > 2) {
255 pr_err("%s: unrecognised EXT_CSD structure "
256 "version %d\n", mmc_hostname(card->host),
257 card->ext_csd.raw_ext_csd_structure);
263 card->ext_csd.rev = ext_csd[EXT_CSD_REV];
264 if (card->ext_csd.rev > 6) {
265 pr_err("%s: unrecognised EXT_CSD revision %d\n",
266 mmc_hostname(card->host), card->ext_csd.rev);
271 card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
272 card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
273 card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
274 card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
275 if (card->ext_csd.rev >= 2) {
276 card->ext_csd.sectors =
277 ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
278 ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
279 ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
280 ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
282 /* Cards with density > 2GiB are sector addressed */
283 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
284 mmc_card_set_blockaddr(card);
286 card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
287 switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
288 case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
289 EXT_CSD_CARD_TYPE_26:
290 card->ext_csd.hs_max_dtr = 52000000;
291 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
293 case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
294 EXT_CSD_CARD_TYPE_26:
295 card->ext_csd.hs_max_dtr = 52000000;
296 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
298 case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
299 EXT_CSD_CARD_TYPE_26:
300 card->ext_csd.hs_max_dtr = 52000000;
301 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
303 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
304 card->ext_csd.hs_max_dtr = 52000000;
306 case EXT_CSD_CARD_TYPE_26:
307 card->ext_csd.hs_max_dtr = 26000000;
310 /* MMC v4 spec says this cannot happen */
311 pr_warning("%s: card is mmc v4 but doesn't "
312 "support any high-speed modes.\n",
313 mmc_hostname(card->host));
316 card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
317 card->ext_csd.raw_erase_timeout_mult =
318 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
319 card->ext_csd.raw_hc_erase_grp_size =
320 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
321 if (card->ext_csd.rev >= 3) {
322 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
323 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
325 /* EXT_CSD value is in units of 10ms, but we store in ms */
326 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
328 /* Sleep / awake timeout in 100ns units */
329 if (sa_shift > 0 && sa_shift <= 0x17)
330 card->ext_csd.sa_timeout =
331 1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
332 card->ext_csd.erase_group_def =
333 ext_csd[EXT_CSD_ERASE_GROUP_DEF];
334 card->ext_csd.hc_erase_timeout = 300 *
335 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
336 card->ext_csd.hc_erase_size =
337 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
339 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
342 * There are two boot regions of equal size, defined in
345 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
346 for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
347 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
348 mmc_part_add(card, part_size,
349 EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
350 "boot%d", idx, true);
355 card->ext_csd.raw_hc_erase_gap_size =
356 ext_csd[EXT_CSD_PARTITION_ATTRIBUTE];
357 card->ext_csd.raw_sec_trim_mult =
358 ext_csd[EXT_CSD_SEC_TRIM_MULT];
359 card->ext_csd.raw_sec_erase_mult =
360 ext_csd[EXT_CSD_SEC_ERASE_MULT];
361 card->ext_csd.raw_sec_feature_support =
362 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
363 card->ext_csd.raw_trim_mult =
364 ext_csd[EXT_CSD_TRIM_MULT];
365 if (card->ext_csd.rev >= 4) {
367 * Enhanced area feature support -- check whether the eMMC
368 * card has the Enhanced area enabled. If so, export enhanced
369 * area offset and size to user by adding sysfs interface.
371 card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
372 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
373 (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
375 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
377 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
379 card->ext_csd.enhanced_area_en = 1;
381 * calculate the enhanced data area offset, in bytes
383 card->ext_csd.enhanced_area_offset =
384 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
385 (ext_csd[137] << 8) + ext_csd[136];
386 if (mmc_card_blockaddr(card))
387 card->ext_csd.enhanced_area_offset <<= 9;
389 * calculate the enhanced data area size, in kilobytes
391 card->ext_csd.enhanced_area_size =
392 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
394 card->ext_csd.enhanced_area_size *=
395 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
396 card->ext_csd.enhanced_area_size <<= 9;
399 * If the enhanced area is not enabled, disable these
402 card->ext_csd.enhanced_area_offset = -EINVAL;
403 card->ext_csd.enhanced_area_size = -EINVAL;
407 * General purpose partition feature support --
408 * If ext_csd has the size of general purpose partitions,
409 * set size, part_cfg, partition name in mmc_part.
411 if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
412 EXT_CSD_PART_SUPPORT_PART_EN) {
413 if (card->ext_csd.enhanced_area_en != 1) {
415 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
417 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
419 card->ext_csd.enhanced_area_en = 1;
422 for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
423 if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
424 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
425 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
428 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
430 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
432 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
433 part_size *= (size_t)(hc_erase_grp_sz *
435 mmc_part_add(card, part_size << 19,
436 EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
440 card->ext_csd.sec_trim_mult =
441 ext_csd[EXT_CSD_SEC_TRIM_MULT];
442 card->ext_csd.sec_erase_mult =
443 ext_csd[EXT_CSD_SEC_ERASE_MULT];
444 card->ext_csd.sec_feature_support =
445 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
446 card->ext_csd.trim_timeout = 300 *
447 ext_csd[EXT_CSD_TRIM_MULT];
450 if (card->ext_csd.rev >= 5) {
451 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
452 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
455 card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
456 if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
457 card->erased_byte = 0xFF;
459 card->erased_byte = 0x0;
461 if (card->ext_csd.rev >= 6)
462 card->ext_csd.generic_cmd6_time = 10 *
463 ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
465 card->ext_csd.generic_cmd6_time = 0;
471 static inline void mmc_free_ext_csd(u8 *ext_csd)
477 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
482 if (bus_width == MMC_BUS_WIDTH_1)
485 err = mmc_get_ext_csd(card, &bw_ext_csd);
487 if (err || bw_ext_csd == NULL) {
488 if (bus_width != MMC_BUS_WIDTH_1)
493 if (bus_width == MMC_BUS_WIDTH_1)
496 /* only compare read only fields */
497 err = (!(card->ext_csd.raw_partition_support ==
498 bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
499 (card->ext_csd.raw_erased_mem_count ==
500 bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
501 (card->ext_csd.rev ==
502 bw_ext_csd[EXT_CSD_REV]) &&
503 (card->ext_csd.raw_ext_csd_structure ==
504 bw_ext_csd[EXT_CSD_STRUCTURE]) &&
505 (card->ext_csd.raw_card_type ==
506 bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
507 (card->ext_csd.raw_s_a_timeout ==
508 bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
509 (card->ext_csd.raw_hc_erase_gap_size ==
510 bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
511 (card->ext_csd.raw_erase_timeout_mult ==
512 bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
513 (card->ext_csd.raw_hc_erase_grp_size ==
514 bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
515 (card->ext_csd.raw_sec_trim_mult ==
516 bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
517 (card->ext_csd.raw_sec_erase_mult ==
518 bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
519 (card->ext_csd.raw_sec_feature_support ==
520 bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
521 (card->ext_csd.raw_trim_mult ==
522 bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
523 (card->ext_csd.raw_sectors[0] ==
524 bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
525 (card->ext_csd.raw_sectors[1] ==
526 bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
527 (card->ext_csd.raw_sectors[2] ==
528 bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
529 (card->ext_csd.raw_sectors[3] ==
530 bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
535 mmc_free_ext_csd(bw_ext_csd);
539 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
540 card->raw_cid[2], card->raw_cid[3]);
541 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
542 card->raw_csd[2], card->raw_csd[3]);
543 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
544 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
545 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
546 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
547 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
548 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
549 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
550 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
551 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
552 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
553 card->ext_csd.enhanced_area_offset);
554 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
556 static struct attribute *mmc_std_attrs[] = {
560 &dev_attr_erase_size.attr,
561 &dev_attr_preferred_erase_size.attr,
562 &dev_attr_fwrev.attr,
563 &dev_attr_hwrev.attr,
564 &dev_attr_manfid.attr,
566 &dev_attr_oemid.attr,
567 &dev_attr_serial.attr,
568 &dev_attr_enhanced_area_offset.attr,
569 &dev_attr_enhanced_area_size.attr,
573 static struct attribute_group mmc_std_attr_group = {
574 .attrs = mmc_std_attrs,
577 static const struct attribute_group *mmc_attr_groups[] = {
582 static struct device_type mmc_type = {
583 .groups = mmc_attr_groups,
587 * Select the PowerClass for the current bus width
588 * If power class is defined for 4/8 bit bus in the
589 * extended CSD register, select it by executing the
590 * mmc_switch command.
592 static int mmc_select_powerclass(struct mmc_card *card,
593 unsigned int bus_width, u8 *ext_csd)
596 unsigned int pwrclass_val;
597 unsigned int index = 0;
598 struct mmc_host *host;
608 /* Power class selection is supported for versions >= 4.0 */
609 if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
612 /* Power class values are defined only for 4/8 bit bus */
613 if (bus_width == EXT_CSD_BUS_WIDTH_1)
616 switch (1 << host->ios.vdd) {
617 case MMC_VDD_165_195:
618 if (host->ios.clock <= 26000000)
619 index = EXT_CSD_PWR_CL_26_195;
620 else if (host->ios.clock <= 52000000)
621 index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
622 EXT_CSD_PWR_CL_52_195 :
623 EXT_CSD_PWR_CL_DDR_52_195;
624 else if (host->ios.clock <= 200000000)
625 index = EXT_CSD_PWR_CL_200_195;
631 if (host->ios.clock <= 26000000)
632 index = EXT_CSD_PWR_CL_26_360;
633 else if (host->ios.clock <= 52000000)
634 index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
635 EXT_CSD_PWR_CL_52_360 :
636 EXT_CSD_PWR_CL_DDR_52_360;
637 else if (host->ios.clock <= 200000000)
638 index = EXT_CSD_PWR_CL_200_360;
641 pr_warning("%s: Voltage range not supported "
642 "for power class.\n", mmc_hostname(host));
646 pwrclass_val = ext_csd[index];
648 if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
649 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
650 EXT_CSD_PWR_CL_8BIT_SHIFT;
652 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
653 EXT_CSD_PWR_CL_4BIT_SHIFT;
655 /* If the power class is different from the default value */
656 if (pwrclass_val > 0) {
657 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
667 * Handle the detection and initialisation of a card.
669 * In the case of a resume, "oldcard" will contain the card
670 * we're trying to reinitialise.
672 static int mmc_init_card(struct mmc_host *host, u32 ocr,
673 struct mmc_card *oldcard)
675 struct mmc_card *card;
678 unsigned int max_dtr;
683 WARN_ON(!host->claimed);
685 /* Set correct bus mode for MMC before attempting init */
686 if (!mmc_host_is_spi(host))
687 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
690 * Since we're changing the OCR value, we seem to
691 * need to tell some cards to go back to the idle
692 * state. We wait 1ms to give cards time to
694 * mmc_go_idle is needed for eMMC that are asleep
698 /* The extra bit indicates that we support high capacity */
699 err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
704 * For SPI, enable CRC as appropriate.
706 if (mmc_host_is_spi(host)) {
707 err = mmc_spi_set_crc(host, use_spi_crc);
713 * Fetch CID from card.
715 if (mmc_host_is_spi(host))
716 err = mmc_send_cid(host, cid);
718 err = mmc_all_send_cid(host, cid);
723 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
731 * Allocate card structure.
733 card = mmc_alloc_card(host, &mmc_type);
739 card->type = MMC_TYPE_MMC;
741 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
745 * For native busses: set card RCA and quit open drain mode.
747 if (!mmc_host_is_spi(host)) {
748 err = mmc_set_relative_addr(card);
752 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
757 * Fetch CSD from card.
759 err = mmc_send_csd(card, card->raw_csd);
763 err = mmc_decode_csd(card);
766 err = mmc_decode_cid(card);
772 * Select card, as all following commands rely on that.
774 if (!mmc_host_is_spi(host)) {
775 err = mmc_select_card(card);
782 * Fetch and process extended CSD.
785 err = mmc_get_ext_csd(card, &ext_csd);
788 err = mmc_read_ext_csd(card, ext_csd);
792 /* If doing byte addressing, check if required to do sector
793 * addressing. Handle the case of <2GB cards needing sector
794 * addressing. See section 8.1 JEDEC Standard JED84-A441;
795 * ocr register has bit 30 set for sector addressing.
797 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
798 mmc_card_set_blockaddr(card);
800 /* Erase size depends on CSD and Extended CSD */
801 mmc_set_erase_size(card);
805 * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
806 * bit. This bit will be lost every time after a reset or power off.
808 if (card->ext_csd.enhanced_area_en) {
809 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
810 EXT_CSD_ERASE_GROUP_DEF, 1,
811 card->ext_csd.generic_cmd6_time);
813 if (err && err != -EBADMSG)
819 * Just disable enhanced area off & sz
820 * will try to enable ERASE_GROUP_DEF
821 * during next time reinit
823 card->ext_csd.enhanced_area_offset = -EINVAL;
824 card->ext_csd.enhanced_area_size = -EINVAL;
826 card->ext_csd.erase_group_def = 1;
828 * enable ERASE_GRP_DEF successfully.
829 * This will affect the erase size, so
830 * here need to reset erase size
832 mmc_set_erase_size(card);
837 * Ensure eMMC user default partition is enabled
839 if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
840 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
841 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
842 card->ext_csd.part_config,
843 card->ext_csd.part_time);
844 if (err && err != -EBADMSG)
849 * Activate high speed (if supported)
851 if ((card->ext_csd.hs_max_dtr != 0) &&
852 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
853 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
854 EXT_CSD_HS_TIMING, 1,
855 card->ext_csd.generic_cmd6_time);
856 if (err && err != -EBADMSG)
860 pr_warning("%s: switch to highspeed failed\n",
861 mmc_hostname(card->host));
864 mmc_card_set_highspeed(card);
865 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
872 max_dtr = (unsigned int)-1;
874 if (mmc_card_highspeed(card)) {
875 if (max_dtr > card->ext_csd.hs_max_dtr)
876 max_dtr = card->ext_csd.hs_max_dtr;
877 } else if (max_dtr > card->csd.max_dtr) {
878 max_dtr = card->csd.max_dtr;
881 mmc_set_clock(host, max_dtr);
884 * Indicate DDR mode (if supported).
886 if (mmc_card_highspeed(card)) {
887 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
888 && ((host->caps & (MMC_CAP_1_8V_DDR |
890 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
891 ddr = MMC_1_8V_DDR_MODE;
892 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
893 && ((host->caps & (MMC_CAP_1_2V_DDR |
895 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
896 ddr = MMC_1_2V_DDR_MODE;
900 * Activate wide bus and DDR (if supported).
902 if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
903 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
904 static unsigned ext_csd_bits[][2] = {
905 { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
906 { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
907 { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
909 static unsigned bus_widths[] = {
914 unsigned idx, bus_width = 0;
916 if (host->caps & MMC_CAP_8_BIT_DATA)
920 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
921 bus_width = bus_widths[idx];
922 if (bus_width == MMC_BUS_WIDTH_1)
923 ddr = 0; /* no DDR for 1-bit width */
924 err = mmc_select_powerclass(card, ext_csd_bits[idx][0],
927 pr_err("%s: power class selection to "
928 "bus width %d failed\n",
929 mmc_hostname(card->host),
932 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
934 ext_csd_bits[idx][0],
935 card->ext_csd.generic_cmd6_time);
937 mmc_set_bus_width(card->host, bus_width);
940 * If controller can't handle bus width test,
941 * compare ext_csd previously read in 1 bit mode
942 * against ext_csd at new bus width
944 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
945 err = mmc_compare_ext_csds(card,
948 err = mmc_bus_test(card, bus_width);
955 err = mmc_select_powerclass(card, ext_csd_bits[idx][1],
958 pr_err("%s: power class selection to "
959 "bus width %d ddr %d failed\n",
960 mmc_hostname(card->host),
961 1 << bus_width, ddr);
963 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
965 ext_csd_bits[idx][1],
966 card->ext_csd.generic_cmd6_time);
969 pr_warning("%s: switch to bus width %d ddr %d "
970 "failed\n", mmc_hostname(card->host),
971 1 << bus_width, ddr);
975 * eMMC cards can support 3.3V to 1.2V i/o (vccq)
978 * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
980 * 1.8V vccq at 3.3V core voltage (vcc) is not required
981 * in the JEDEC spec for DDR.
983 * Do not force change in vccq since we are obviously
984 * working and no change to vccq is needed.
986 * WARNING: eMMC rules are NOT the same as SD DDR
988 if (ddr == EXT_CSD_CARD_TYPE_DDR_1_2V) {
989 err = mmc_set_signal_voltage(host,
990 MMC_SIGNAL_VOLTAGE_120, 0);
994 mmc_card_set_ddr_mode(card);
995 mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
996 mmc_set_bus_width(card->host, bus_width);
1003 mmc_free_ext_csd(ext_csd);
1008 mmc_remove_card(card);
1010 mmc_free_ext_csd(ext_csd);
1016 * Host is being removed. Free up the current card.
1018 static void mmc_remove(struct mmc_host *host)
1021 BUG_ON(!host->card);
1023 mmc_remove_card(host->card);
1028 * Card detection callback from host.
1030 static void mmc_detect(struct mmc_host *host)
1035 BUG_ON(!host->card);
1037 mmc_claim_host(host);
1040 * Just check if our card has been removed.
1042 err = mmc_send_status(host->card, NULL);
1044 mmc_release_host(host);
1049 mmc_claim_host(host);
1050 mmc_detach_bus(host);
1051 mmc_power_off(host);
1052 mmc_release_host(host);
1057 * Suspend callback from host.
1059 static int mmc_suspend(struct mmc_host *host)
1064 BUG_ON(!host->card);
1066 mmc_claim_host(host);
1067 if (mmc_card_can_sleep(host))
1068 err = mmc_card_sleep(host);
1069 else if (!mmc_host_is_spi(host))
1070 mmc_deselect_cards(host);
1071 host->card->state &= ~MMC_STATE_HIGHSPEED;
1072 mmc_release_host(host);
1078 * Resume callback from host.
1080 * This function tries to determine if the same card is still present
1081 * and, if so, restore all state to it.
1083 static int mmc_resume(struct mmc_host *host)
1088 BUG_ON(!host->card);
1090 mmc_claim_host(host);
1091 err = mmc_init_card(host, host->ocr, host->card);
1092 mmc_release_host(host);
1097 static int mmc_power_restore(struct mmc_host *host)
1101 host->card->state &= ~MMC_STATE_HIGHSPEED;
1102 mmc_claim_host(host);
1103 ret = mmc_init_card(host, host->ocr, host->card);
1104 mmc_release_host(host);
1109 static int mmc_sleep(struct mmc_host *host)
1111 struct mmc_card *card = host->card;
1114 if (card && card->ext_csd.rev >= 3) {
1115 err = mmc_card_sleepawake(host, 1);
1117 pr_debug("%s: Error %d while putting card into sleep",
1118 mmc_hostname(host), err);
1124 static int mmc_awake(struct mmc_host *host)
1126 struct mmc_card *card = host->card;
1129 if (card && card->ext_csd.rev >= 3) {
1130 err = mmc_card_sleepawake(host, 0);
1132 pr_debug("%s: Error %d while awaking sleeping card",
1133 mmc_hostname(host), err);
1139 static const struct mmc_bus_ops mmc_ops = {
1142 .remove = mmc_remove,
1143 .detect = mmc_detect,
1146 .power_restore = mmc_power_restore,
1149 static const struct mmc_bus_ops mmc_ops_unsafe = {
1152 .remove = mmc_remove,
1153 .detect = mmc_detect,
1154 .suspend = mmc_suspend,
1155 .resume = mmc_resume,
1156 .power_restore = mmc_power_restore,
1159 static void mmc_attach_bus_ops(struct mmc_host *host)
1161 const struct mmc_bus_ops *bus_ops;
1163 if (!mmc_card_is_removable(host))
1164 bus_ops = &mmc_ops_unsafe;
1167 mmc_attach_bus(host, bus_ops);
1171 * Starting point for MMC card init.
1173 int mmc_attach_mmc(struct mmc_host *host)
1179 WARN_ON(!host->claimed);
1181 /* Set correct bus mode for MMC before attempting attach */
1182 if (!mmc_host_is_spi(host))
1183 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1185 err = mmc_send_op_cond(host, 0, &ocr);
1189 mmc_attach_bus_ops(host);
1190 if (host->ocr_avail_mmc)
1191 host->ocr_avail = host->ocr_avail_mmc;
1194 * We need to get OCR a different way for SPI.
1196 if (mmc_host_is_spi(host)) {
1197 err = mmc_spi_read_ocr(host, 1, &ocr);
1203 * Sanity check the voltages that the card claims to
1207 pr_warning("%s: card claims to support voltages "
1208 "below the defined range. These will be ignored.\n",
1209 mmc_hostname(host));
1213 host->ocr = mmc_select_voltage(host, ocr);
1216 * Can we support the voltage of the card?
1224 * Detect and init the card.
1226 err = mmc_init_card(host, host->ocr, NULL);
1230 mmc_release_host(host);
1231 err = mmc_add_card(host->card);
1232 mmc_claim_host(host);
1239 mmc_release_host(host);
1240 mmc_remove_card(host->card);
1241 mmc_claim_host(host);
1244 mmc_detach_bus(host);
1246 pr_err("%s: error %d whilst initialising MMC card\n",
1247 mmc_hostname(host), err);