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 printk(KERN_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 printk(KERN_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 printk(KERN_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 printk(KERN_ERR "%s: unable to read EXT_CSD "
221 "on a possible high capacity card. "
222 "Card will be ignored.\n",
223 mmc_hostname(card->host));
225 printk(KERN_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)
249 /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
250 card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
251 if (card->csd.structure == 3) {
252 if (card->ext_csd.raw_ext_csd_structure > 2) {
253 printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
254 "version %d\n", mmc_hostname(card->host),
255 card->ext_csd.raw_ext_csd_structure);
261 card->ext_csd.rev = ext_csd[EXT_CSD_REV];
262 if (card->ext_csd.rev > 6) {
263 printk(KERN_ERR "%s: unrecognised EXT_CSD revision %d\n",
264 mmc_hostname(card->host), card->ext_csd.rev);
269 card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
270 card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
271 card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
272 card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
273 if (card->ext_csd.rev >= 2) {
274 card->ext_csd.sectors =
275 ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
276 ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
277 ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
278 ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
280 /* Cards with density > 2GiB are sector addressed */
281 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
282 mmc_card_set_blockaddr(card);
284 card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
285 switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
286 case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
287 EXT_CSD_CARD_TYPE_26:
288 card->ext_csd.hs_max_dtr = 52000000;
289 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
291 case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
292 EXT_CSD_CARD_TYPE_26:
293 card->ext_csd.hs_max_dtr = 52000000;
294 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
296 case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
297 EXT_CSD_CARD_TYPE_26:
298 card->ext_csd.hs_max_dtr = 52000000;
299 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
301 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
302 card->ext_csd.hs_max_dtr = 52000000;
304 case EXT_CSD_CARD_TYPE_26:
305 card->ext_csd.hs_max_dtr = 26000000;
308 /* MMC v4 spec says this cannot happen */
309 printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
310 "support any high-speed modes.\n",
311 mmc_hostname(card->host));
314 card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
315 card->ext_csd.raw_erase_timeout_mult =
316 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
317 card->ext_csd.raw_hc_erase_grp_size =
318 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
319 if (card->ext_csd.rev >= 3) {
320 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
321 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
323 /* EXT_CSD value is in units of 10ms, but we store in ms */
324 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
326 /* Sleep / awake timeout in 100ns units */
327 if (sa_shift > 0 && sa_shift <= 0x17)
328 card->ext_csd.sa_timeout =
329 1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
330 card->ext_csd.erase_group_def =
331 ext_csd[EXT_CSD_ERASE_GROUP_DEF];
332 card->ext_csd.hc_erase_timeout = 300 *
333 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
334 card->ext_csd.hc_erase_size =
335 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
337 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
340 * There are two boot regions of equal size, defined in
343 card->ext_csd.boot_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
346 card->ext_csd.raw_hc_erase_gap_size =
347 ext_csd[EXT_CSD_PARTITION_ATTRIBUTE];
348 card->ext_csd.raw_sec_trim_mult =
349 ext_csd[EXT_CSD_SEC_TRIM_MULT];
350 card->ext_csd.raw_sec_erase_mult =
351 ext_csd[EXT_CSD_SEC_ERASE_MULT];
352 card->ext_csd.raw_sec_feature_support =
353 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
354 card->ext_csd.raw_trim_mult =
355 ext_csd[EXT_CSD_TRIM_MULT];
356 if (card->ext_csd.rev >= 4) {
358 * Enhanced area feature support -- check whether the eMMC
359 * card has the Enhanced area enabled. If so, export enhanced
360 * area offset and size to user by adding sysfs interface.
362 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
363 (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
365 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
367 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
369 card->ext_csd.enhanced_area_en = 1;
371 * calculate the enhanced data area offset, in bytes
373 card->ext_csd.enhanced_area_offset =
374 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
375 (ext_csd[137] << 8) + ext_csd[136];
376 if (mmc_card_blockaddr(card))
377 card->ext_csd.enhanced_area_offset <<= 9;
379 * calculate the enhanced data area size, in kilobytes
381 card->ext_csd.enhanced_area_size =
382 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
384 card->ext_csd.enhanced_area_size *=
385 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
386 card->ext_csd.enhanced_area_size <<= 9;
389 * If the enhanced area is not enabled, disable these
392 card->ext_csd.enhanced_area_offset = -EINVAL;
393 card->ext_csd.enhanced_area_size = -EINVAL;
395 card->ext_csd.sec_trim_mult =
396 ext_csd[EXT_CSD_SEC_TRIM_MULT];
397 card->ext_csd.sec_erase_mult =
398 ext_csd[EXT_CSD_SEC_ERASE_MULT];
399 card->ext_csd.sec_feature_support =
400 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
401 card->ext_csd.trim_timeout = 300 *
402 ext_csd[EXT_CSD_TRIM_MULT];
405 if (card->ext_csd.rev >= 5) {
406 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
407 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
410 if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
411 card->erased_byte = 0xFF;
413 card->erased_byte = 0x0;
419 static inline void mmc_free_ext_csd(u8 *ext_csd)
425 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
430 if (bus_width == MMC_BUS_WIDTH_1)
433 err = mmc_get_ext_csd(card, &bw_ext_csd);
435 if (err || bw_ext_csd == NULL) {
436 if (bus_width != MMC_BUS_WIDTH_1)
441 if (bus_width == MMC_BUS_WIDTH_1)
444 /* only compare read only fields */
445 err = (!(card->ext_csd.raw_partition_support ==
446 bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
447 (card->ext_csd.raw_erased_mem_count ==
448 bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
449 (card->ext_csd.rev ==
450 bw_ext_csd[EXT_CSD_REV]) &&
451 (card->ext_csd.raw_ext_csd_structure ==
452 bw_ext_csd[EXT_CSD_STRUCTURE]) &&
453 (card->ext_csd.raw_card_type ==
454 bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
455 (card->ext_csd.raw_s_a_timeout ==
456 bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
457 (card->ext_csd.raw_hc_erase_gap_size ==
458 bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
459 (card->ext_csd.raw_erase_timeout_mult ==
460 bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
461 (card->ext_csd.raw_hc_erase_grp_size ==
462 bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
463 (card->ext_csd.raw_sec_trim_mult ==
464 bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
465 (card->ext_csd.raw_sec_erase_mult ==
466 bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
467 (card->ext_csd.raw_sec_feature_support ==
468 bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
469 (card->ext_csd.raw_trim_mult ==
470 bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
471 (card->ext_csd.raw_sectors[0] ==
472 bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
473 (card->ext_csd.raw_sectors[1] ==
474 bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
475 (card->ext_csd.raw_sectors[2] ==
476 bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
477 (card->ext_csd.raw_sectors[3] ==
478 bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
483 mmc_free_ext_csd(bw_ext_csd);
487 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
488 card->raw_cid[2], card->raw_cid[3]);
489 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
490 card->raw_csd[2], card->raw_csd[3]);
491 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
492 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
493 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
494 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
495 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
496 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
497 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
498 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
499 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
500 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
501 card->ext_csd.enhanced_area_offset);
502 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
504 static struct attribute *mmc_std_attrs[] = {
508 &dev_attr_erase_size.attr,
509 &dev_attr_preferred_erase_size.attr,
510 &dev_attr_fwrev.attr,
511 &dev_attr_hwrev.attr,
512 &dev_attr_manfid.attr,
514 &dev_attr_oemid.attr,
515 &dev_attr_serial.attr,
516 &dev_attr_enhanced_area_offset.attr,
517 &dev_attr_enhanced_area_size.attr,
521 static struct attribute_group mmc_std_attr_group = {
522 .attrs = mmc_std_attrs,
525 static const struct attribute_group *mmc_attr_groups[] = {
530 static struct device_type mmc_type = {
531 .groups = mmc_attr_groups,
535 * Handle the detection and initialisation of a card.
537 * In the case of a resume, "oldcard" will contain the card
538 * we're trying to reinitialise.
540 static int mmc_init_card(struct mmc_host *host, u32 ocr,
541 struct mmc_card *oldcard)
543 struct mmc_card *card;
546 unsigned int max_dtr;
551 WARN_ON(!host->claimed);
553 /* Set correct bus mode for MMC before attempting init */
554 if (!mmc_host_is_spi(host))
555 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
558 * Since we're changing the OCR value, we seem to
559 * need to tell some cards to go back to the idle
560 * state. We wait 1ms to give cards time to
562 * mmc_go_idle is needed for eMMC that are asleep
566 /* The extra bit indicates that we support high capacity */
567 err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
572 * For SPI, enable CRC as appropriate.
574 if (mmc_host_is_spi(host)) {
575 err = mmc_spi_set_crc(host, use_spi_crc);
581 * Fetch CID from card.
583 if (mmc_host_is_spi(host))
584 err = mmc_send_cid(host, cid);
586 err = mmc_all_send_cid(host, cid);
591 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
599 * Allocate card structure.
601 card = mmc_alloc_card(host, &mmc_type);
607 card->type = MMC_TYPE_MMC;
609 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
613 * For native busses: set card RCA and quit open drain mode.
615 if (!mmc_host_is_spi(host)) {
616 err = mmc_set_relative_addr(card);
620 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
625 * Fetch CSD from card.
627 err = mmc_send_csd(card, card->raw_csd);
631 err = mmc_decode_csd(card);
634 err = mmc_decode_cid(card);
640 * Select card, as all following commands rely on that.
642 if (!mmc_host_is_spi(host)) {
643 err = mmc_select_card(card);
650 * Fetch and process extended CSD.
653 err = mmc_get_ext_csd(card, &ext_csd);
656 err = mmc_read_ext_csd(card, ext_csd);
660 /* If doing byte addressing, check if required to do sector
661 * addressing. Handle the case of <2GB cards needing sector
662 * addressing. See section 8.1 JEDEC Standard JED84-A441;
663 * ocr register has bit 30 set for sector addressing.
665 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
666 mmc_card_set_blockaddr(card);
668 /* Erase size depends on CSD and Extended CSD */
669 mmc_set_erase_size(card);
673 * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
674 * bit. This bit will be lost every time after a reset or power off.
676 if (card->ext_csd.enhanced_area_en) {
677 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
678 EXT_CSD_ERASE_GROUP_DEF, 1, 0);
680 if (err && err != -EBADMSG)
686 * Just disable enhanced area off & sz
687 * will try to enable ERASE_GROUP_DEF
688 * during next time reinit
690 card->ext_csd.enhanced_area_offset = -EINVAL;
691 card->ext_csd.enhanced_area_size = -EINVAL;
693 card->ext_csd.erase_group_def = 1;
695 * enable ERASE_GRP_DEF successfully.
696 * This will affect the erase size, so
697 * here need to reset erase size
699 mmc_set_erase_size(card);
704 * Ensure eMMC user default partition is enabled
706 if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
707 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
708 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
709 card->ext_csd.part_config,
710 card->ext_csd.part_time);
711 if (err && err != -EBADMSG)
716 * Activate high speed (if supported)
718 if ((card->ext_csd.hs_max_dtr != 0) &&
719 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
720 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
721 EXT_CSD_HS_TIMING, 1, 0);
722 if (err && err != -EBADMSG)
726 printk(KERN_WARNING "%s: switch to highspeed failed\n",
727 mmc_hostname(card->host));
730 mmc_card_set_highspeed(card);
731 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
738 max_dtr = (unsigned int)-1;
740 if (mmc_card_highspeed(card)) {
741 if (max_dtr > card->ext_csd.hs_max_dtr)
742 max_dtr = card->ext_csd.hs_max_dtr;
743 } else if (max_dtr > card->csd.max_dtr) {
744 max_dtr = card->csd.max_dtr;
747 mmc_set_clock(host, max_dtr);
750 * Indicate DDR mode (if supported).
752 if (mmc_card_highspeed(card)) {
753 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
754 && ((host->caps & (MMC_CAP_1_8V_DDR |
756 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
757 ddr = MMC_1_8V_DDR_MODE;
758 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
759 && ((host->caps & (MMC_CAP_1_2V_DDR |
761 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
762 ddr = MMC_1_2V_DDR_MODE;
766 * Activate wide bus and DDR (if supported).
768 if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
769 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
770 static unsigned ext_csd_bits[][2] = {
771 { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
772 { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
773 { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
775 static unsigned bus_widths[] = {
780 unsigned idx, bus_width = 0;
782 if (host->caps & MMC_CAP_8_BIT_DATA)
786 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
787 bus_width = bus_widths[idx];
788 if (bus_width == MMC_BUS_WIDTH_1)
789 ddr = 0; /* no DDR for 1-bit width */
790 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
792 ext_csd_bits[idx][0],
795 mmc_set_bus_width(card->host, bus_width);
798 * If controller can't handle bus width test,
799 * compare ext_csd previously read in 1 bit mode
800 * against ext_csd at new bus width
802 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
803 err = mmc_compare_ext_csds(card,
806 err = mmc_bus_test(card, bus_width);
813 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
815 ext_csd_bits[idx][1],
819 printk(KERN_WARNING "%s: switch to bus width %d ddr %d "
820 "failed\n", mmc_hostname(card->host),
821 1 << bus_width, ddr);
825 * eMMC cards can support 3.3V to 1.2V i/o (vccq)
828 * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
830 * 1.8V vccq at 3.3V core voltage (vcc) is not required
831 * in the JEDEC spec for DDR.
833 * Do not force change in vccq since we are obviously
834 * working and no change to vccq is needed.
836 * WARNING: eMMC rules are NOT the same as SD DDR
838 if (ddr == EXT_CSD_CARD_TYPE_DDR_1_2V) {
839 err = mmc_set_signal_voltage(host,
840 MMC_SIGNAL_VOLTAGE_120, 0);
844 mmc_card_set_ddr_mode(card);
845 mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
846 mmc_set_bus_width(card->host, bus_width);
853 mmc_free_ext_csd(ext_csd);
858 mmc_remove_card(card);
860 mmc_free_ext_csd(ext_csd);
866 * Host is being removed. Free up the current card.
868 static void mmc_remove(struct mmc_host *host)
873 mmc_remove_card(host->card);
878 * Card detection callback from host.
880 static void mmc_detect(struct mmc_host *host)
887 mmc_claim_host(host);
890 * Just check if our card has been removed.
892 err = mmc_send_status(host->card, NULL);
894 mmc_release_host(host);
899 mmc_claim_host(host);
900 mmc_detach_bus(host);
902 mmc_release_host(host);
907 * Suspend callback from host.
909 static int mmc_suspend(struct mmc_host *host)
916 mmc_claim_host(host);
917 if (mmc_card_can_sleep(host))
918 err = mmc_card_sleep(host);
919 else if (!mmc_host_is_spi(host))
920 mmc_deselect_cards(host);
921 host->card->state &= ~MMC_STATE_HIGHSPEED;
922 mmc_release_host(host);
928 * Resume callback from host.
930 * This function tries to determine if the same card is still present
931 * and, if so, restore all state to it.
933 static int mmc_resume(struct mmc_host *host)
940 mmc_claim_host(host);
941 err = mmc_init_card(host, host->ocr, host->card);
942 mmc_release_host(host);
947 static int mmc_power_restore(struct mmc_host *host)
951 host->card->state &= ~MMC_STATE_HIGHSPEED;
952 mmc_claim_host(host);
953 ret = mmc_init_card(host, host->ocr, host->card);
954 mmc_release_host(host);
959 static int mmc_sleep(struct mmc_host *host)
961 struct mmc_card *card = host->card;
964 if (card && card->ext_csd.rev >= 3) {
965 err = mmc_card_sleepawake(host, 1);
967 pr_debug("%s: Error %d while putting card into sleep",
968 mmc_hostname(host), err);
974 static int mmc_awake(struct mmc_host *host)
976 struct mmc_card *card = host->card;
979 if (card && card->ext_csd.rev >= 3) {
980 err = mmc_card_sleepawake(host, 0);
982 pr_debug("%s: Error %d while awaking sleeping card",
983 mmc_hostname(host), err);
989 static const struct mmc_bus_ops mmc_ops = {
992 .remove = mmc_remove,
993 .detect = mmc_detect,
996 .power_restore = mmc_power_restore,
999 static const struct mmc_bus_ops mmc_ops_unsafe = {
1002 .remove = mmc_remove,
1003 .detect = mmc_detect,
1004 .suspend = mmc_suspend,
1005 .resume = mmc_resume,
1006 .power_restore = mmc_power_restore,
1009 static void mmc_attach_bus_ops(struct mmc_host *host)
1011 const struct mmc_bus_ops *bus_ops;
1013 if (!mmc_card_is_removable(host))
1014 bus_ops = &mmc_ops_unsafe;
1017 mmc_attach_bus(host, bus_ops);
1021 * Starting point for MMC card init.
1023 int mmc_attach_mmc(struct mmc_host *host)
1029 WARN_ON(!host->claimed);
1031 /* Set correct bus mode for MMC before attempting attach */
1032 if (!mmc_host_is_spi(host))
1033 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1035 err = mmc_send_op_cond(host, 0, &ocr);
1039 mmc_attach_bus_ops(host);
1040 if (host->ocr_avail_mmc)
1041 host->ocr_avail = host->ocr_avail_mmc;
1044 * We need to get OCR a different way for SPI.
1046 if (mmc_host_is_spi(host)) {
1047 err = mmc_spi_read_ocr(host, 1, &ocr);
1053 * Sanity check the voltages that the card claims to
1057 printk(KERN_WARNING "%s: card claims to support voltages "
1058 "below the defined range. These will be ignored.\n",
1059 mmc_hostname(host));
1063 host->ocr = mmc_select_voltage(host, ocr);
1066 * Can we support the voltage of the card?
1074 * Detect and init the card.
1076 err = mmc_init_card(host, host->ocr, NULL);
1080 mmc_release_host(host);
1081 err = mmc_add_card(host->card);
1082 mmc_claim_host(host);
1089 mmc_release_host(host);
1090 mmc_remove_card(host->card);
1091 mmc_claim_host(host);
1094 mmc_detach_bus(host);
1096 printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
1097 mmc_hostname(host), err);