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 | EXT_CSD_CARD_TYPE_26:
262 card->ext_csd.hs_max_dtr = 52000000;
264 case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
265 card->ext_csd.hs_max_dtr = 52000000;
267 case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
268 card->ext_csd.hs_max_dtr = 52000000;
270 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
271 card->ext_csd.hs_max_dtr = 52000000;
273 case EXT_CSD_CARD_TYPE_26:
274 card->ext_csd.hs_max_dtr = 26000000;
277 /* MMC v4 spec says this cannot happen */
278 printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
279 "support any high-speed modes.\n",
280 mmc_hostname(card->host));
283 if (card->ext_csd.rev >= 3) {
284 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
286 /* Sleep / awake timeout in 100ns units */
287 if (sa_shift > 0 && sa_shift <= 0x17)
288 card->ext_csd.sa_timeout =
289 1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
290 card->ext_csd.erase_group_def =
291 ext_csd[EXT_CSD_ERASE_GROUP_DEF];
292 card->ext_csd.hc_erase_timeout = 300 *
293 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
294 card->ext_csd.hc_erase_size =
295 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
298 if (card->ext_csd.rev >= 4) {
299 card->ext_csd.sec_trim_mult =
300 ext_csd[EXT_CSD_SEC_TRIM_MULT];
301 card->ext_csd.sec_erase_mult =
302 ext_csd[EXT_CSD_SEC_ERASE_MULT];
303 card->ext_csd.sec_feature_support =
304 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
305 card->ext_csd.trim_timeout = 300 *
306 ext_csd[EXT_CSD_TRIM_MULT];
309 if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
310 card->erased_byte = 0xFF;
312 card->erased_byte = 0x0;
320 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
321 card->raw_cid[2], card->raw_cid[3]);
322 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
323 card->raw_csd[2], card->raw_csd[3]);
324 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
325 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
326 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
327 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
328 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
329 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
330 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
331 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
332 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
334 static struct attribute *mmc_std_attrs[] = {
338 &dev_attr_erase_size.attr,
339 &dev_attr_preferred_erase_size.attr,
340 &dev_attr_fwrev.attr,
341 &dev_attr_hwrev.attr,
342 &dev_attr_manfid.attr,
344 &dev_attr_oemid.attr,
345 &dev_attr_serial.attr,
349 static struct attribute_group mmc_std_attr_group = {
350 .attrs = mmc_std_attrs,
353 static const struct attribute_group *mmc_attr_groups[] = {
358 static struct device_type mmc_type = {
359 .groups = mmc_attr_groups,
363 * Handle the detection and initialisation of a card.
365 * In the case of a resume, "oldcard" will contain the card
366 * we're trying to reinitialise.
368 static int mmc_init_card(struct mmc_host *host, u32 ocr,
369 struct mmc_card *oldcard)
371 struct mmc_card *card;
374 unsigned int max_dtr;
377 WARN_ON(!host->claimed);
380 * Since we're changing the OCR value, we seem to
381 * need to tell some cards to go back to the idle
382 * state. We wait 1ms to give cards time to
387 /* The extra bit indicates that we support high capacity */
388 err = mmc_send_op_cond(host, ocr | (1 << 30), NULL);
393 * For SPI, enable CRC as appropriate.
395 if (mmc_host_is_spi(host)) {
396 err = mmc_spi_set_crc(host, use_spi_crc);
402 * Fetch CID from card.
404 if (mmc_host_is_spi(host))
405 err = mmc_send_cid(host, cid);
407 err = mmc_all_send_cid(host, cid);
412 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
420 * Allocate card structure.
422 card = mmc_alloc_card(host, &mmc_type);
428 card->type = MMC_TYPE_MMC;
430 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
434 * For native busses: set card RCA and quit open drain mode.
436 if (!mmc_host_is_spi(host)) {
437 err = mmc_set_relative_addr(card);
441 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
446 * Fetch CSD from card.
448 err = mmc_send_csd(card, card->raw_csd);
452 err = mmc_decode_csd(card);
455 err = mmc_decode_cid(card);
461 * Select card, as all following commands rely on that.
463 if (!mmc_host_is_spi(host)) {
464 err = mmc_select_card(card);
471 * Fetch and process extended CSD.
473 err = mmc_read_ext_csd(card);
476 /* Erase size depends on CSD and Extended CSD */
477 mmc_set_erase_size(card);
481 * Activate high speed (if supported)
483 if ((card->ext_csd.hs_max_dtr != 0) &&
484 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
485 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
486 EXT_CSD_HS_TIMING, 1);
487 if (err && err != -EBADMSG)
491 printk(KERN_WARNING "%s: switch to highspeed failed\n",
492 mmc_hostname(card->host));
495 mmc_card_set_highspeed(card);
496 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
503 max_dtr = (unsigned int)-1;
505 if (mmc_card_highspeed(card)) {
506 if (max_dtr > card->ext_csd.hs_max_dtr)
507 max_dtr = card->ext_csd.hs_max_dtr;
508 } else if (max_dtr > card->csd.max_dtr) {
509 max_dtr = card->csd.max_dtr;
512 mmc_set_clock(host, max_dtr);
515 * Activate wide bus (if supported).
517 if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
518 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA |
520 unsigned ext_csd_bit, bus_width;
522 if ((host->caps & MMC_CAP_DDR) &&
523 (card->ext_csd.rev >= 5)) {
524 if (host->caps & MMC_CAP_8_BIT_DATA) {
525 ext_csd_bit = EXT_CSD_BUS_WIDTH_8_DDR;
526 bus_width = MMC_BUS_WIDTH_8_DDR;
527 } else if (host->caps & MMC_CAP_4_BIT_DATA) {
528 ext_csd_bit = EXT_CSD_BUS_WIDTH_4_DDR;
529 bus_width = MMC_BUS_WIDTH_4_DDR;
532 if (host->caps & MMC_CAP_8_BIT_DATA) {
533 ext_csd_bit = EXT_CSD_BUS_WIDTH_8;
534 bus_width = MMC_BUS_WIDTH_8;
535 } else if (host->caps & MMC_CAP_4_BIT_DATA) {
536 ext_csd_bit = EXT_CSD_BUS_WIDTH_4;
537 bus_width = MMC_BUS_WIDTH_4;
541 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
542 EXT_CSD_BUS_WIDTH, ext_csd_bit);
544 if (err && err != -EBADMSG)
548 printk(KERN_WARNING "%s: switch to bus width %d "
549 "failed\n", mmc_hostname(card->host),
553 mmc_set_bus_width(card->host, bus_width);
564 mmc_remove_card(card);
571 * Host is being removed. Free up the current card.
573 static void mmc_remove(struct mmc_host *host)
578 mmc_remove_card(host->card);
583 * Card detection callback from host.
585 static void mmc_detect(struct mmc_host *host)
592 mmc_claim_host(host);
595 * Just check if our card has been removed.
597 err = mmc_send_status(host->card, NULL);
599 mmc_release_host(host);
604 mmc_claim_host(host);
605 mmc_detach_bus(host);
606 mmc_release_host(host);
611 * Suspend callback from host.
613 static int mmc_suspend(struct mmc_host *host)
618 mmc_claim_host(host);
619 if (!mmc_host_is_spi(host))
620 mmc_deselect_cards(host);
621 host->card->state &= ~MMC_STATE_HIGHSPEED;
622 mmc_release_host(host);
628 * Resume callback from host.
630 * This function tries to determine if the same card is still present
631 * and, if so, restore all state to it.
633 static int mmc_resume(struct mmc_host *host)
640 mmc_claim_host(host);
641 err = mmc_init_card(host, host->ocr, host->card);
642 mmc_release_host(host);
647 static void mmc_power_restore(struct mmc_host *host)
649 host->card->state &= ~MMC_STATE_HIGHSPEED;
650 mmc_claim_host(host);
651 mmc_init_card(host, host->ocr, host->card);
652 mmc_release_host(host);
655 static int mmc_sleep(struct mmc_host *host)
657 struct mmc_card *card = host->card;
660 if (card && card->ext_csd.rev >= 3) {
661 err = mmc_card_sleepawake(host, 1);
663 pr_debug("%s: Error %d while putting card into sleep",
664 mmc_hostname(host), err);
670 static int mmc_awake(struct mmc_host *host)
672 struct mmc_card *card = host->card;
675 if (card && card->ext_csd.rev >= 3) {
676 err = mmc_card_sleepawake(host, 0);
678 pr_debug("%s: Error %d while awaking sleeping card",
679 mmc_hostname(host), err);
685 static const struct mmc_bus_ops mmc_ops = {
688 .remove = mmc_remove,
689 .detect = mmc_detect,
692 .power_restore = mmc_power_restore,
695 static const struct mmc_bus_ops mmc_ops_unsafe = {
698 .remove = mmc_remove,
699 .detect = mmc_detect,
700 .suspend = mmc_suspend,
701 .resume = mmc_resume,
702 .power_restore = mmc_power_restore,
705 static void mmc_attach_bus_ops(struct mmc_host *host)
707 const struct mmc_bus_ops *bus_ops;
709 if (!mmc_card_is_removable(host))
710 bus_ops = &mmc_ops_unsafe;
713 mmc_attach_bus(host, bus_ops);
717 * Starting point for MMC card init.
719 int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
724 WARN_ON(!host->claimed);
726 mmc_attach_bus_ops(host);
729 * We need to get OCR a different way for SPI.
731 if (mmc_host_is_spi(host)) {
732 err = mmc_spi_read_ocr(host, 1, &ocr);
738 * Sanity check the voltages that the card claims to
742 printk(KERN_WARNING "%s: card claims to support voltages "
743 "below the defined range. These will be ignored.\n",
748 host->ocr = mmc_select_voltage(host, ocr);
751 * Can we support the voltage of the card?
759 * Detect and init the card.
761 err = mmc_init_card(host, host->ocr, NULL);
765 mmc_release_host(host);
767 err = mmc_add_card(host->card);
774 mmc_remove_card(host->card);
776 mmc_claim_host(host);
778 mmc_detach_bus(host);
779 mmc_release_host(host);
781 printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
782 mmc_hostname(host), err);