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>
15 #include <linux/mmc/host.h>
16 #include <linux/mmc/card.h>
17 #include <linux/mmc/mmc.h>
23 static const unsigned int tran_exp[] = {
24 10000, 100000, 1000000, 10000000,
28 static const unsigned char tran_mant[] = {
29 0, 10, 12, 13, 15, 20, 25, 30,
30 35, 40, 45, 50, 55, 60, 70, 80,
33 static const unsigned int tacc_exp[] = {
34 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
37 static const unsigned int tacc_mant[] = {
38 0, 10, 12, 13, 15, 20, 25, 30,
39 35, 40, 45, 50, 55, 60, 70, 80,
42 #define UNSTUFF_BITS(resp,start,size) \
44 const int __size = size; \
45 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
46 const int __off = 3 - ((start) / 32); \
47 const int __shft = (start) & 31; \
50 __res = resp[__off] >> __shft; \
51 if (__size + __shft > 32) \
52 __res |= resp[__off-1] << ((32 - __shft) % 32); \
57 * Given the decoded CSD structure, decode the raw CID to our CID structure.
59 static int mmc_decode_cid(struct mmc_card *card)
61 u32 *resp = card->raw_cid;
64 * The selection of the format here is based upon published
65 * specs from sandisk and from what people have reported.
67 switch (card->csd.mmca_vsn) {
68 case 0: /* MMC v1.0 - v1.2 */
69 case 1: /* MMC v1.4 */
70 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
71 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
72 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
73 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
74 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
75 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
76 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
77 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
78 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
79 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
80 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
81 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
82 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
85 case 2: /* MMC v2.0 - v2.2 */
86 case 3: /* MMC v3.1 - v3.3 */
88 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
89 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
90 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
91 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
92 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
93 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
94 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
95 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
96 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
97 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
98 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
102 printk(KERN_ERR "%s: card has unknown MMCA version %d\n",
103 mmc_hostname(card->host), card->csd.mmca_vsn);
111 * Given a 128-bit response, decode to our card CSD structure.
113 static int mmc_decode_csd(struct mmc_card *card)
115 struct mmc_csd *csd = &card->csd;
116 unsigned int e, m, csd_struct;
117 u32 *resp = card->raw_csd;
120 * We only understand CSD structure v1.1 and v1.2.
121 * v1.2 has extra information in bits 15, 11 and 10.
123 csd_struct = UNSTUFF_BITS(resp, 126, 2);
124 if (csd_struct != 1 && csd_struct != 2) {
125 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
126 mmc_hostname(card->host), csd_struct);
130 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
131 m = UNSTUFF_BITS(resp, 115, 4);
132 e = UNSTUFF_BITS(resp, 112, 3);
133 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
134 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
136 m = UNSTUFF_BITS(resp, 99, 4);
137 e = UNSTUFF_BITS(resp, 96, 3);
138 csd->max_dtr = tran_exp[e] * tran_mant[m];
139 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
141 e = UNSTUFF_BITS(resp, 47, 3);
142 m = UNSTUFF_BITS(resp, 62, 12);
143 csd->capacity = (1 + m) << (e + 2);
145 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
146 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
147 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
148 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
149 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
150 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
151 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
157 * Read and decode extended CSD.
159 static int mmc_read_ext_csd(struct mmc_card *card)
163 unsigned int ext_csd_struct;
167 if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
171 * As the ext_csd is so large and mostly unused, we don't store the
172 * raw block in mmc_card.
174 ext_csd = kmalloc(512, GFP_KERNEL);
176 printk(KERN_ERR "%s: could not allocate a buffer to "
177 "receive the ext_csd.\n", mmc_hostname(card->host));
181 err = mmc_send_ext_csd(card, ext_csd);
184 * We all hosts that cannot perform the command
185 * to fail more gracefully
191 * High capacity cards should have this "magic" size
192 * stored in their CSD.
194 if (card->csd.capacity == (4096 * 512)) {
195 printk(KERN_ERR "%s: unable to read EXT_CSD "
196 "on a possible high capacity card. "
197 "Card will be ignored.\n",
198 mmc_hostname(card->host));
200 printk(KERN_WARNING "%s: unable to read "
201 "EXT_CSD, performance might "
203 mmc_hostname(card->host));
210 ext_csd_struct = ext_csd[EXT_CSD_REV];
211 if (ext_csd_struct > 3) {
212 printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
213 "version %d\n", mmc_hostname(card->host),
219 if (ext_csd_struct >= 2) {
220 card->ext_csd.sectors =
221 ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
222 ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
223 ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
224 ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
225 if (card->ext_csd.sectors)
226 mmc_card_set_blockaddr(card);
229 switch (ext_csd[EXT_CSD_CARD_TYPE]) {
230 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
231 card->ext_csd.hs_max_dtr = 52000000;
233 case EXT_CSD_CARD_TYPE_26:
234 card->ext_csd.hs_max_dtr = 26000000;
237 /* MMC v4 spec says this cannot happen */
238 printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
239 "support any high-speed modes.\n",
240 mmc_hostname(card->host));
250 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
251 card->raw_cid[2], card->raw_cid[3]);
252 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
253 card->raw_csd[2], card->raw_csd[3]);
254 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
255 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
256 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
257 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
258 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
259 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
260 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
262 static struct attribute *mmc_std_attrs[] = {
266 &dev_attr_fwrev.attr,
267 &dev_attr_hwrev.attr,
268 &dev_attr_manfid.attr,
270 &dev_attr_oemid.attr,
271 &dev_attr_serial.attr,
275 static struct attribute_group mmc_std_attr_group = {
276 .attrs = mmc_std_attrs,
279 static struct attribute_group *mmc_attr_groups[] = {
284 static struct device_type mmc_type = {
285 .groups = mmc_attr_groups,
289 * Handle the detection and initialisation of a card.
291 * In the case of a resume, "oldcard" will contain the card
292 * we're trying to reinitialise.
294 static int mmc_init_card(struct mmc_host *host, u32 ocr,
295 struct mmc_card *oldcard)
297 struct mmc_card *card;
300 unsigned int max_dtr;
303 WARN_ON(!host->claimed);
306 * Since we're changing the OCR value, we seem to
307 * need to tell some cards to go back to the idle
308 * state. We wait 1ms to give cards time to
313 /* The extra bit indicates that we support high capacity */
314 err = mmc_send_op_cond(host, ocr | (1 << 30), NULL);
319 * For SPI, enable CRC as appropriate.
321 if (mmc_host_is_spi(host)) {
322 err = mmc_spi_set_crc(host, use_spi_crc);
328 * Fetch CID from card.
330 if (mmc_host_is_spi(host))
331 err = mmc_send_cid(host, cid);
333 err = mmc_all_send_cid(host, cid);
338 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
346 * Allocate card structure.
348 card = mmc_alloc_card(host, &mmc_type);
354 card->type = MMC_TYPE_MMC;
356 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
360 * For native busses: set card RCA and quit open drain mode.
362 if (!mmc_host_is_spi(host)) {
363 err = mmc_set_relative_addr(card);
367 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
372 * Fetch CSD from card.
374 err = mmc_send_csd(card, card->raw_csd);
378 err = mmc_decode_csd(card);
381 err = mmc_decode_cid(card);
387 * Select card, as all following commands rely on that.
389 if (!mmc_host_is_spi(host)) {
390 err = mmc_select_card(card);
397 * Fetch and process extended CSD.
399 err = mmc_read_ext_csd(card);
405 * Activate high speed (if supported)
407 if ((card->ext_csd.hs_max_dtr != 0) &&
408 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
409 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
410 EXT_CSD_HS_TIMING, 1);
414 mmc_card_set_highspeed(card);
416 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
422 max_dtr = (unsigned int)-1;
424 if (mmc_card_highspeed(card)) {
425 if (max_dtr > card->ext_csd.hs_max_dtr)
426 max_dtr = card->ext_csd.hs_max_dtr;
427 } else if (max_dtr > card->csd.max_dtr) {
428 max_dtr = card->csd.max_dtr;
431 mmc_set_clock(host, max_dtr);
434 * Activate wide bus (if supported).
436 if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
437 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
438 unsigned ext_csd_bit, bus_width;
440 if (host->caps & MMC_CAP_8_BIT_DATA) {
441 ext_csd_bit = EXT_CSD_BUS_WIDTH_8;
442 bus_width = MMC_BUS_WIDTH_8;
444 ext_csd_bit = EXT_CSD_BUS_WIDTH_4;
445 bus_width = MMC_BUS_WIDTH_4;
448 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
449 EXT_CSD_BUS_WIDTH, ext_csd_bit);
454 mmc_set_bus_width(card->host, bus_width);
464 mmc_remove_card(card);
471 * Host is being removed. Free up the current card.
473 static void mmc_remove(struct mmc_host *host)
478 mmc_remove_card(host->card);
483 * Card detection callback from host.
485 static void mmc_detect(struct mmc_host *host)
492 mmc_claim_host(host);
495 * Just check if our card has been removed.
497 err = mmc_send_status(host->card, NULL);
499 mmc_release_host(host);
504 mmc_claim_host(host);
505 mmc_detach_bus(host);
506 mmc_release_host(host);
510 #ifdef CONFIG_MMC_UNSAFE_RESUME
513 * Suspend callback from host.
515 static void mmc_suspend(struct mmc_host *host)
520 mmc_claim_host(host);
521 if (!mmc_host_is_spi(host))
522 mmc_deselect_cards(host);
523 host->card->state &= ~MMC_STATE_HIGHSPEED;
524 mmc_release_host(host);
528 * Resume callback from host.
530 * This function tries to determine if the same card is still present
531 * and, if so, restore all state to it.
533 static void mmc_resume(struct mmc_host *host)
540 mmc_claim_host(host);
541 err = mmc_init_card(host, host->ocr, host->card);
542 mmc_release_host(host);
547 mmc_claim_host(host);
548 mmc_detach_bus(host);
549 mmc_release_host(host);
556 #define mmc_suspend NULL
557 #define mmc_resume NULL
561 static const struct mmc_bus_ops mmc_ops = {
562 .remove = mmc_remove,
563 .detect = mmc_detect,
564 .suspend = mmc_suspend,
565 .resume = mmc_resume,
569 * Starting point for MMC card init.
571 int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
576 WARN_ON(!host->claimed);
578 mmc_attach_bus(host, &mmc_ops);
581 * We need to get OCR a different way for SPI.
583 if (mmc_host_is_spi(host)) {
584 err = mmc_spi_read_ocr(host, 1, &ocr);
590 * Sanity check the voltages that the card claims to
594 printk(KERN_WARNING "%s: card claims to support voltages "
595 "below the defined range. These will be ignored.\n",
600 host->ocr = mmc_select_voltage(host, ocr);
603 * Can we support the voltage of the card?
611 * Detect and init the card.
613 err = mmc_init_card(host, host->ocr, NULL);
617 mmc_release_host(host);
619 err = mmc_add_card(host->card);
626 mmc_remove_card(host->card);
628 mmc_claim_host(host);
630 mmc_detach_bus(host);
631 mmc_release_host(host);
633 printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
634 mmc_hostname(host), err);