2 * linux/drivers/mmc/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("%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("%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)
166 err = MMC_ERR_FAILED;
168 if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
172 * As the ext_csd is so large and mostly unused, we don't store the
173 * raw block in mmc_card.
175 ext_csd = kmalloc(512, GFP_KERNEL);
177 printk(KERN_ERR "%s: could not allocate a buffer to "
178 "receive the ext_csd. mmc v4 cards will be "
179 "treated as v3.\n", mmc_hostname(card->host));
180 return MMC_ERR_FAILED;
183 err = mmc_send_ext_csd(card, ext_csd);
184 if (err != MMC_ERR_NONE) {
186 * High capacity cards should have this "magic" size
187 * stored in their CSD.
189 if (card->csd.capacity == (4096 * 512)) {
190 printk(KERN_ERR "%s: unable to read EXT_CSD "
191 "on a possible high capacity card. "
192 "Card will be ignored.\n",
193 mmc_hostname(card->host));
195 printk(KERN_WARNING "%s: unable to read "
196 "EXT_CSD, performance might "
198 mmc_hostname(card->host));
204 card->ext_csd.sectors =
205 ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
206 ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
207 ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
208 ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
209 if (card->ext_csd.sectors)
210 mmc_card_set_blockaddr(card);
212 switch (ext_csd[EXT_CSD_CARD_TYPE]) {
213 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
214 card->ext_csd.hs_max_dtr = 52000000;
216 case EXT_CSD_CARD_TYPE_26:
217 card->ext_csd.hs_max_dtr = 26000000;
220 /* MMC v4 spec says this cannot happen */
221 printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
222 "support any high-speed modes.\n",
223 mmc_hostname(card->host));
234 * Handle the detection and initialisation of a card.
236 * In the case of a resume, "curcard" will contain the card
237 * we're trying to reinitialise.
239 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
240 struct mmc_card *oldcard)
242 struct mmc_card *card;
245 unsigned int max_dtr;
248 BUG_ON(!host->claimed);
251 * Since we're changing the OCR value, we seem to
252 * need to tell some cards to go back to the idle
253 * state. We wait 1ms to give cards time to
258 /* The extra bit indicates that we support high capacity */
259 err = mmc_send_op_cond(host, ocr | (1 << 30), NULL);
260 if (err != MMC_ERR_NONE)
264 * Fetch CID from card.
266 err = mmc_all_send_cid(host, cid);
267 if (err != MMC_ERR_NONE)
271 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
277 * Allocate card structure.
279 card = mmc_alloc_card(host);
283 card->type = MMC_TYPE_MMC;
285 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
291 err = mmc_set_relative_addr(card);
292 if (err != MMC_ERR_NONE)
295 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
299 * Fetch CSD from card.
301 err = mmc_send_csd(card, card->raw_csd);
302 if (err != MMC_ERR_NONE)
305 err = mmc_decode_csd(card);
308 err = mmc_decode_cid(card);
314 * Select card, as all following commands rely on that.
316 err = mmc_select_card(card);
317 if (err != MMC_ERR_NONE)
322 * Fetch and process extened CSD.
324 err = mmc_read_ext_csd(card);
325 if (err != MMC_ERR_NONE)
330 * Activate high speed (if supported)
332 if ((card->ext_csd.hs_max_dtr != 0) &&
333 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
334 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
335 EXT_CSD_HS_TIMING, 1);
336 if (err != MMC_ERR_NONE)
339 mmc_card_set_highspeed(card);
341 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
347 max_dtr = (unsigned int)-1;
349 if (mmc_card_highspeed(card)) {
350 if (max_dtr > card->ext_csd.hs_max_dtr)
351 max_dtr = card->ext_csd.hs_max_dtr;
352 } else if (max_dtr > card->csd.max_dtr) {
353 max_dtr = card->csd.max_dtr;
356 mmc_set_clock(host, max_dtr);
359 * Activate wide bus (if supported).
361 if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
362 (host->caps & MMC_CAP_4_BIT_DATA)) {
363 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
364 EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4);
365 if (err != MMC_ERR_NONE)
368 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
378 mmc_remove_card(card);
381 return MMC_ERR_FAILED;
385 * Host is being removed. Free up the current card.
387 static void mmc_remove(struct mmc_host *host)
392 mmc_remove_card(host->card);
397 * Card detection callback from host.
399 static void mmc_detect(struct mmc_host *host)
406 mmc_claim_host(host);
409 * Just check if our card has been removed.
411 err = mmc_send_status(host->card, NULL);
413 mmc_release_host(host);
415 if (err != MMC_ERR_NONE) {
416 mmc_remove_card(host->card);
419 mmc_claim_host(host);
420 mmc_detach_bus(host);
421 mmc_release_host(host);
425 #ifdef CONFIG_MMC_UNSAFE_RESUME
428 * Suspend callback from host.
430 static void mmc_suspend(struct mmc_host *host)
435 mmc_claim_host(host);
436 mmc_deselect_cards(host);
437 host->card->state &= ~MMC_STATE_HIGHSPEED;
438 mmc_release_host(host);
442 * Resume callback from host.
444 * This function tries to determine if the same card is still present
445 * and, if so, restore all state to it.
447 static void mmc_resume(struct mmc_host *host)
454 mmc_claim_host(host);
456 err = mmc_sd_init_card(host, host->ocr, host->card);
457 if (err != MMC_ERR_NONE) {
458 mmc_remove_card(host->card);
461 mmc_detach_bus(host);
464 mmc_release_host(host);
469 #define mmc_suspend NULL
470 #define mmc_resume NULL
474 static const struct mmc_bus_ops mmc_ops = {
475 .remove = mmc_remove,
476 .detect = mmc_detect,
477 .suspend = mmc_suspend,
478 .resume = mmc_resume,
482 * Starting point for MMC card init.
484 int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
489 BUG_ON(!host->claimed);
491 mmc_attach_bus(host, &mmc_ops);
494 * Sanity check the voltages that the card claims to
498 printk(KERN_WARNING "%s: card claims to support voltages "
499 "below the defined range. These will be ignored.\n",
504 host->ocr = mmc_select_voltage(host, ocr);
507 * Can we support the voltage of the card?
513 * Detect and init the card.
515 err = mmc_sd_init_card(host, host->ocr, NULL);
516 if (err != MMC_ERR_NONE)
519 mmc_release_host(host);
521 err = mmc_register_card(host->card);
528 mmc_claim_host(host);
529 mmc_remove_card(host->card);
532 mmc_detach_bus(host);
533 mmc_release_host(host);