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>
24 static const unsigned int tran_exp[] = {
25 10000, 100000, 1000000, 10000000,
29 static const unsigned char tran_mant[] = {
30 0, 10, 12, 13, 15, 20, 25, 30,
31 35, 40, 45, 50, 55, 60, 70, 80,
34 static const unsigned int tacc_exp[] = {
35 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
38 static const unsigned int tacc_mant[] = {
39 0, 10, 12, 13, 15, 20, 25, 30,
40 35, 40, 45, 50, 55, 60, 70, 80,
43 #define UNSTUFF_BITS(resp,start,size) \
45 const int __size = size; \
46 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
47 const int __off = 3 - ((start) / 32); \
48 const int __shft = (start) & 31; \
51 __res = resp[__off] >> __shft; \
52 if (__size + __shft > 32) \
53 __res |= resp[__off-1] << ((32 - __shft) % 32); \
58 * Given the decoded CSD structure, decode the raw CID to our CID structure.
60 static int mmc_decode_cid(struct mmc_card *card)
62 u32 *resp = card->raw_cid;
65 * The selection of the format here is based upon published
66 * specs from sandisk and from what people have reported.
68 switch (card->csd.mmca_vsn) {
69 case 0: /* MMC v1.0 - v1.2 */
70 case 1: /* MMC v1.4 */
71 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
72 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
73 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
74 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
75 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
76 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
77 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
78 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
79 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
80 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
81 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
82 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
83 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
86 case 2: /* MMC v2.0 - v2.2 */
87 case 3: /* MMC v3.1 - v3.3 */
89 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
90 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
91 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
92 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
93 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
94 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
95 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
96 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
97 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
98 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
99 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
103 printk(KERN_ERR "%s: card has unknown MMCA version %d\n",
104 mmc_hostname(card->host), card->csd.mmca_vsn);
111 static void mmc_set_erase_size(struct mmc_card *card)
113 if (card->ext_csd.erase_group_def & 1)
114 card->erase_size = card->ext_csd.hc_erase_size;
116 card->erase_size = card->csd.erase_size;
118 mmc_init_erase(card);
122 * Given a 128-bit response, decode to our card CSD structure.
124 static int mmc_decode_csd(struct mmc_card *card)
126 struct mmc_csd *csd = &card->csd;
127 unsigned int e, m, a, b;
128 u32 *resp = card->raw_csd;
131 * We only understand CSD structure v1.1 and v1.2.
132 * v1.2 has extra information in bits 15, 11 and 10.
133 * We also support eMMC v4.4 & v4.41.
135 csd->structure = UNSTUFF_BITS(resp, 126, 2);
136 if (csd->structure == 0) {
137 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
138 mmc_hostname(card->host), csd->structure);
142 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
143 m = UNSTUFF_BITS(resp, 115, 4);
144 e = UNSTUFF_BITS(resp, 112, 3);
145 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
146 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
148 m = UNSTUFF_BITS(resp, 99, 4);
149 e = UNSTUFF_BITS(resp, 96, 3);
150 csd->max_dtr = tran_exp[e] * tran_mant[m];
151 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
153 e = UNSTUFF_BITS(resp, 47, 3);
154 m = UNSTUFF_BITS(resp, 62, 12);
155 csd->capacity = (1 + m) << (e + 2);
157 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
158 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
159 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
160 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
161 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
162 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
163 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
165 if (csd->write_blkbits >= 9) {
166 a = UNSTUFF_BITS(resp, 42, 5);
167 b = UNSTUFF_BITS(resp, 37, 5);
168 csd->erase_size = (a + 1) * (b + 1);
169 csd->erase_size <<= csd->write_blkbits - 9;
176 * Read and decode extended CSD.
178 static int mmc_read_ext_csd(struct mmc_card *card)
185 if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
189 * As the ext_csd is so large and mostly unused, we don't store the
190 * raw block in mmc_card.
192 ext_csd = kmalloc(512, GFP_KERNEL);
194 printk(KERN_ERR "%s: could not allocate a buffer to "
195 "receive the ext_csd.\n", mmc_hostname(card->host));
199 err = mmc_send_ext_csd(card, ext_csd);
201 /* If the host or the card can't do the switch,
202 * fail more gracefully. */
209 * High capacity cards should have this "magic" size
210 * stored in their CSD.
212 if (card->csd.capacity == (4096 * 512)) {
213 printk(KERN_ERR "%s: unable to read EXT_CSD "
214 "on a possible high capacity card. "
215 "Card will be ignored.\n",
216 mmc_hostname(card->host));
218 printk(KERN_WARNING "%s: unable to read "
219 "EXT_CSD, performance might "
221 mmc_hostname(card->host));
228 /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
229 if (card->csd.structure == 3) {
230 int ext_csd_struct = ext_csd[EXT_CSD_STRUCTURE];
231 if (ext_csd_struct > 2) {
232 printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
233 "version %d\n", mmc_hostname(card->host),
240 card->ext_csd.rev = ext_csd[EXT_CSD_REV];
241 if (card->ext_csd.rev > 5) {
242 printk(KERN_ERR "%s: unrecognised EXT_CSD revision %d\n",
243 mmc_hostname(card->host), card->ext_csd.rev);
248 if (card->ext_csd.rev >= 2) {
249 card->ext_csd.sectors =
250 ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
251 ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
252 ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
253 ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
255 /* Cards with density > 2GiB are sector addressed */
256 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
257 mmc_card_set_blockaddr(card);
260 switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
261 case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
262 EXT_CSD_CARD_TYPE_26:
263 card->ext_csd.hs_max_dtr = 52000000;
264 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
266 case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
267 EXT_CSD_CARD_TYPE_26:
268 card->ext_csd.hs_max_dtr = 52000000;
269 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
271 case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
272 EXT_CSD_CARD_TYPE_26:
273 card->ext_csd.hs_max_dtr = 52000000;
274 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
276 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
277 card->ext_csd.hs_max_dtr = 52000000;
279 case EXT_CSD_CARD_TYPE_26:
280 card->ext_csd.hs_max_dtr = 26000000;
283 /* MMC v4 spec says this cannot happen */
284 printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
285 "support any high-speed modes.\n",
286 mmc_hostname(card->host));
289 if (card->ext_csd.rev >= 3) {
290 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
291 card->ext_csd.bootconfig = ext_csd[EXT_CSD_BOOT_CONFIG];
293 /* Sleep / awake timeout in 100ns units */
294 if (sa_shift > 0 && sa_shift <= 0x17)
295 card->ext_csd.sa_timeout =
296 1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
297 card->ext_csd.erase_group_def =
298 ext_csd[EXT_CSD_ERASE_GROUP_DEF];
299 card->ext_csd.hc_erase_timeout = 300 *
300 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
301 card->ext_csd.hc_erase_size =
302 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
304 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
307 if (card->ext_csd.rev >= 4) {
309 * Enhanced area feature support -- check whether the eMMC
310 * card has the Enhanced area enabled. If so, export enhanced
311 * area offset and size to user by adding sysfs interface.
313 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
314 (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
316 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
318 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
320 card->ext_csd.enhanced_area_en = 1;
322 * calculate the enhanced data area offset, in bytes
324 card->ext_csd.enhanced_area_offset =
325 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
326 (ext_csd[137] << 8) + ext_csd[136];
327 if (mmc_card_blockaddr(card))
328 card->ext_csd.enhanced_area_offset <<= 9;
330 * calculate the enhanced data area size, in kilobytes
332 card->ext_csd.enhanced_area_size =
333 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
335 card->ext_csd.enhanced_area_size *=
336 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
337 card->ext_csd.enhanced_area_size <<= 9;
340 * If the enhanced area is not enabled, disable these
343 card->ext_csd.enhanced_area_offset = -EINVAL;
344 card->ext_csd.enhanced_area_size = -EINVAL;
346 card->ext_csd.sec_trim_mult =
347 ext_csd[EXT_CSD_SEC_TRIM_MULT];
348 card->ext_csd.sec_erase_mult =
349 ext_csd[EXT_CSD_SEC_ERASE_MULT];
350 card->ext_csd.sec_feature_support =
351 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
352 card->ext_csd.trim_timeout = 300 *
353 ext_csd[EXT_CSD_TRIM_MULT];
356 if (card->ext_csd.rev >= 5)
357 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
359 if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
360 card->erased_byte = 0xFF;
362 card->erased_byte = 0x0;
370 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
371 card->raw_cid[2], card->raw_cid[3]);
372 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
373 card->raw_csd[2], card->raw_csd[3]);
374 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
375 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
376 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
377 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
378 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
379 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
380 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
381 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
382 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
383 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
384 card->ext_csd.enhanced_area_offset);
385 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
387 static struct attribute *mmc_std_attrs[] = {
391 &dev_attr_erase_size.attr,
392 &dev_attr_preferred_erase_size.attr,
393 &dev_attr_fwrev.attr,
394 &dev_attr_hwrev.attr,
395 &dev_attr_manfid.attr,
397 &dev_attr_oemid.attr,
398 &dev_attr_serial.attr,
399 &dev_attr_enhanced_area_offset.attr,
400 &dev_attr_enhanced_area_size.attr,
404 static struct attribute_group mmc_std_attr_group = {
405 .attrs = mmc_std_attrs,
408 static const struct attribute_group *mmc_attr_groups[] = {
413 static struct device_type mmc_type = {
414 .groups = mmc_attr_groups,
418 * Handle the detection and initialisation of a card.
420 * In the case of a resume, "oldcard" will contain the card
421 * we're trying to reinitialise.
423 static int mmc_init_card(struct mmc_host *host, u32 ocr,
424 struct mmc_card *oldcard)
426 struct mmc_card *card;
429 unsigned int max_dtr;
433 WARN_ON(!host->claimed);
436 * Since we're changing the OCR value, we seem to
437 * need to tell some cards to go back to the idle
438 * state. We wait 1ms to give cards time to
443 /* The extra bit indicates that we support high capacity */
444 err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
449 * For SPI, enable CRC as appropriate.
451 if (mmc_host_is_spi(host)) {
452 err = mmc_spi_set_crc(host, use_spi_crc);
458 * Fetch CID from card.
460 if (mmc_host_is_spi(host))
461 err = mmc_send_cid(host, cid);
463 err = mmc_all_send_cid(host, cid);
468 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
476 * Allocate card structure.
478 card = mmc_alloc_card(host, &mmc_type);
484 card->type = MMC_TYPE_MMC;
486 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
490 * For native busses: set card RCA and quit open drain mode.
492 if (!mmc_host_is_spi(host)) {
493 err = mmc_set_relative_addr(card);
497 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
502 * Fetch CSD from card.
504 err = mmc_send_csd(card, card->raw_csd);
508 err = mmc_decode_csd(card);
511 err = mmc_decode_cid(card);
517 * Select card, as all following commands rely on that.
519 if (!mmc_host_is_spi(host)) {
520 err = mmc_select_card(card);
527 * Fetch and process extended CSD.
529 err = mmc_read_ext_csd(card);
533 /* If doing byte addressing, check if required to do sector
534 * addressing. Handle the case of <2GB cards needing sector
535 * addressing. See section 8.1 JEDEC Standard JED84-A441;
536 * ocr register has bit 30 set for sector addressing.
538 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
539 mmc_card_set_blockaddr(card);
541 /* Erase size depends on CSD and Extended CSD */
542 mmc_set_erase_size(card);
546 * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
547 * bit. This bit will be lost every time after a reset or power off.
549 if (card->ext_csd.enhanced_area_en) {
550 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
551 EXT_CSD_ERASE_GROUP_DEF, 1, 0);
553 if (err && err != -EBADMSG)
559 * Just disable enhanced area off & sz
560 * will try to enable ERASE_GROUP_DEF
561 * during next time reinit
563 card->ext_csd.enhanced_area_offset = -EINVAL;
564 card->ext_csd.enhanced_area_size = -EINVAL;
566 card->ext_csd.erase_group_def = 1;
568 * enable ERASE_GRP_DEF successfully.
569 * This will affect the erase size, so
570 * here need to reset erase size
572 mmc_set_erase_size(card);
577 * Ensure eMMC user default partition is enabled
579 if (card->ext_csd.bootconfig & 0x7) {
580 card->ext_csd.bootconfig &= ~0x7;
581 mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_CONFIG,
582 card->ext_csd.bootconfig, 0);
586 * Activate high speed (if supported)
588 if ((card->ext_csd.hs_max_dtr != 0) &&
589 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
590 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
591 EXT_CSD_HS_TIMING, 1, 0);
592 if (err && err != -EBADMSG)
596 printk(KERN_WARNING "%s: switch to highspeed failed\n",
597 mmc_hostname(card->host));
600 mmc_card_set_highspeed(card);
601 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
608 max_dtr = (unsigned int)-1;
610 if (mmc_card_highspeed(card)) {
611 if (max_dtr > card->ext_csd.hs_max_dtr)
612 max_dtr = card->ext_csd.hs_max_dtr;
613 } else if (max_dtr > card->csd.max_dtr) {
614 max_dtr = card->csd.max_dtr;
617 mmc_set_clock(host, max_dtr);
620 * Indicate DDR mode (if supported).
622 if (mmc_card_highspeed(card)) {
623 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
624 && (host->caps & (MMC_CAP_1_8V_DDR)))
625 ddr = MMC_1_8V_DDR_MODE;
626 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
627 && (host->caps & (MMC_CAP_1_2V_DDR)))
628 ddr = MMC_1_2V_DDR_MODE;
632 * Activate wide bus and DDR (if supported).
634 if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
635 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
636 static unsigned ext_csd_bits[][2] = {
637 { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
638 { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
639 { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
641 static unsigned bus_widths[] = {
646 unsigned idx, bus_width = 0;
648 if (host->caps & MMC_CAP_8_BIT_DATA)
652 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
653 bus_width = bus_widths[idx];
654 if (bus_width == MMC_BUS_WIDTH_1)
655 ddr = 0; /* no DDR for 1-bit width */
656 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
658 ext_csd_bits[idx][0],
661 mmc_set_bus_width_ddr(card->host,
662 bus_width, MMC_SDR_MODE);
664 * If controller can't handle bus width test,
665 * use the highest bus width to maintain
666 * compatibility with previous MMC behavior.
668 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
670 err = mmc_bus_test(card, bus_width);
677 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
679 ext_csd_bits[idx][1],
683 printk(KERN_WARNING "%s: switch to bus width %d ddr %d "
684 "failed\n", mmc_hostname(card->host),
685 1 << bus_width, ddr);
688 mmc_card_set_ddr_mode(card);
689 mmc_set_bus_width_ddr(card->host, bus_width, ddr);
700 mmc_remove_card(card);
707 * Host is being removed. Free up the current card.
709 static void mmc_remove(struct mmc_host *host)
714 mmc_remove_card(host->card);
719 * Card detection callback from host.
721 static void mmc_detect(struct mmc_host *host)
728 mmc_claim_host(host);
731 * Just check if our card has been removed.
733 err = mmc_send_status(host->card, NULL);
735 mmc_release_host(host);
740 mmc_claim_host(host);
741 mmc_detach_bus(host);
742 mmc_release_host(host);
747 * Suspend callback from host.
749 static int mmc_suspend(struct mmc_host *host)
754 mmc_claim_host(host);
755 if (!mmc_host_is_spi(host))
756 mmc_deselect_cards(host);
757 host->card->state &= ~MMC_STATE_HIGHSPEED;
758 mmc_release_host(host);
764 * Resume callback from host.
766 * This function tries to determine if the same card is still present
767 * and, if so, restore all state to it.
769 static int mmc_resume(struct mmc_host *host)
776 mmc_claim_host(host);
777 err = mmc_init_card(host, host->ocr, host->card);
778 mmc_release_host(host);
783 static int mmc_power_restore(struct mmc_host *host)
787 host->card->state &= ~MMC_STATE_HIGHSPEED;
788 mmc_claim_host(host);
789 ret = mmc_init_card(host, host->ocr, host->card);
790 mmc_release_host(host);
795 static int mmc_sleep(struct mmc_host *host)
797 struct mmc_card *card = host->card;
800 if (card && card->ext_csd.rev >= 3) {
801 err = mmc_card_sleepawake(host, 1);
803 pr_debug("%s: Error %d while putting card into sleep",
804 mmc_hostname(host), err);
810 static int mmc_awake(struct mmc_host *host)
812 struct mmc_card *card = host->card;
815 if (card && card->ext_csd.rev >= 3) {
816 err = mmc_card_sleepawake(host, 0);
818 pr_debug("%s: Error %d while awaking sleeping card",
819 mmc_hostname(host), err);
825 static const struct mmc_bus_ops mmc_ops = {
828 .remove = mmc_remove,
829 .detect = mmc_detect,
832 .power_restore = mmc_power_restore,
835 static const struct mmc_bus_ops mmc_ops_unsafe = {
838 .remove = mmc_remove,
839 .detect = mmc_detect,
840 .suspend = mmc_suspend,
841 .resume = mmc_resume,
842 .power_restore = mmc_power_restore,
845 static void mmc_attach_bus_ops(struct mmc_host *host)
847 const struct mmc_bus_ops *bus_ops;
849 if (!mmc_card_is_removable(host))
850 bus_ops = &mmc_ops_unsafe;
853 mmc_attach_bus(host, bus_ops);
857 * Starting point for MMC card init.
859 int mmc_attach_mmc(struct mmc_host *host)
865 WARN_ON(!host->claimed);
867 err = mmc_send_op_cond(host, 0, &ocr);
871 mmc_attach_bus_ops(host);
872 if (host->ocr_avail_mmc)
873 host->ocr_avail = host->ocr_avail_mmc;
876 * We need to get OCR a different way for SPI.
878 if (mmc_host_is_spi(host)) {
879 err = mmc_spi_read_ocr(host, 1, &ocr);
885 * Sanity check the voltages that the card claims to
889 printk(KERN_WARNING "%s: card claims to support voltages "
890 "below the defined range. These will be ignored.\n",
895 host->ocr = mmc_select_voltage(host, ocr);
898 * Can we support the voltage of the card?
906 * Detect and init the card.
908 err = mmc_init_card(host, host->ocr, NULL);
912 mmc_release_host(host);
913 err = mmc_add_card(host->card);
914 mmc_claim_host(host);
921 mmc_release_host(host);
922 mmc_remove_card(host->card);
923 mmc_claim_host(host);
926 mmc_detach_bus(host);
928 printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
929 mmc_hostname(host), err);