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 void 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);
104 mmc_card_set_bad(card);
110 * Given a 128-bit response, decode to our card CSD structure.
112 static void mmc_decode_csd(struct mmc_card *card)
114 struct mmc_csd *csd = &card->csd;
115 unsigned int e, m, csd_struct;
116 u32 *resp = card->raw_csd;
119 * We only understand CSD structure v1.1 and v1.2.
120 * v1.2 has extra information in bits 15, 11 and 10.
122 csd_struct = UNSTUFF_BITS(resp, 126, 2);
123 if (csd_struct != 1 && csd_struct != 2) {
124 printk("%s: unrecognised CSD structure version %d\n",
125 mmc_hostname(card->host), csd_struct);
126 mmc_card_set_bad(card);
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);
155 * Read and decode extended CSD. Switch to high-speed and wide bus
158 static int mmc_process_ext_csd(struct mmc_card *card)
165 err = MMC_ERR_FAILED;
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. mmc v4 cards will be "
178 "treated as v3.\n", mmc_hostname(card->host));
179 return MMC_ERR_FAILED;
182 err = mmc_send_ext_csd(card, ext_csd);
183 if (err != MMC_ERR_NONE) {
185 * High capacity cards should have this "magic" size
186 * stored in their CSD.
188 if (card->csd.capacity == (4096 * 512)) {
189 printk(KERN_ERR "%s: unable to read EXT_CSD "
190 "on a possible high capacity card. "
191 "Card will be ignored.\n",
192 mmc_hostname(card->host));
194 printk(KERN_WARNING "%s: unable to read "
195 "EXT_CSD, performance might "
197 mmc_hostname(card->host));
203 card->ext_csd.sectors =
204 ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
205 ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
206 ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
207 ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
208 if (card->ext_csd.sectors)
209 mmc_card_set_blockaddr(card);
211 switch (ext_csd[EXT_CSD_CARD_TYPE]) {
212 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
213 card->ext_csd.hs_max_dtr = 52000000;
215 case EXT_CSD_CARD_TYPE_26:
216 card->ext_csd.hs_max_dtr = 26000000;
219 /* MMC v4 spec says this cannot happen */
220 printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
221 "support any high-speed modes.\n",
222 mmc_hostname(card->host));
226 if (card->host->caps & MMC_CAP_MMC_HIGHSPEED) {
227 /* Activate highspeed support. */
228 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
229 EXT_CSD_HS_TIMING, 1);
230 if (err != MMC_ERR_NONE) {
231 printk(KERN_WARNING "%s: failed to switch "
232 "card to mmc v4 high-speed mode.\n",
233 mmc_hostname(card->host));
238 mmc_card_set_highspeed(card);
240 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
243 /* Check for host support for wide-bus modes. */
244 if (card->host->caps & MMC_CAP_4_BIT_DATA) {
245 /* Activate 4-bit support. */
246 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
247 EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4);
248 if (err != MMC_ERR_NONE) {
249 printk(KERN_WARNING "%s: failed to switch "
250 "card to mmc v4 4-bit bus mode.\n",
251 mmc_hostname(card->host));
256 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
266 * Host is being removed. Free up the current card.
268 static void mmc_remove(struct mmc_host *host)
273 mmc_remove_card(host->card);
278 * Card detection callback from host.
280 static void mmc_detect(struct mmc_host *host)
287 mmc_claim_host(host);
290 * Just check if our card has been removed.
292 err = mmc_send_status(host->card, NULL);
294 mmc_release_host(host);
296 if (err != MMC_ERR_NONE) {
297 mmc_remove_card(host->card);
300 mmc_claim_host(host);
301 mmc_detach_bus(host);
302 mmc_release_host(host);
306 static const struct mmc_bus_ops mmc_ops = {
307 .remove = mmc_remove,
308 .detect = mmc_detect,
312 * Starting point for MMC card init.
314 int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
316 struct mmc_card *card;
319 unsigned int max_dtr;
322 BUG_ON(!host->claimed);
324 mmc_attach_bus(host, &mmc_ops);
327 * Sanity check the voltages that the card claims to
331 printk(KERN_WARNING "%s: card claims to support voltages "
332 "below the defined range. These will be ignored.\n",
337 host->ocr = mmc_select_voltage(host, ocr);
340 * Can we support the voltage of the card?
346 * Since we're changing the OCR value, we seem to
347 * need to tell some cards to go back to the idle
348 * state. We wait 1ms to give cards time to
353 /* The extra bit indicates that we support high capacity */
354 mmc_send_op_cond(host, host->ocr | (1 << 30), NULL);
357 * Fetch CID from card.
359 err = mmc_all_send_cid(host, cid);
360 if (err != MMC_ERR_NONE)
364 * Allocate card structure.
366 card = mmc_alloc_card(host);
370 card->type = MMC_TYPE_MMC;
372 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
377 err = mmc_set_relative_addr(card);
378 if (err != MMC_ERR_NONE)
381 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
384 * Fetch CSD from card.
386 err = mmc_send_csd(card, card->raw_csd);
387 if (err != MMC_ERR_NONE)
390 mmc_decode_csd(card);
391 mmc_decode_cid(card);
394 * Fetch and process extened CSD.
395 * This will switch into high-speed and wide bus modes,
398 err = mmc_select_card(card);
399 if (err != MMC_ERR_NONE)
402 err = mmc_process_ext_csd(card);
403 if (err != MMC_ERR_NONE)
409 max_dtr = (unsigned int)-1;
411 if (mmc_card_highspeed(card)) {
412 if (max_dtr > card->ext_csd.hs_max_dtr)
413 max_dtr = card->ext_csd.hs_max_dtr;
414 } else if (max_dtr > card->csd.max_dtr) {
415 max_dtr = card->csd.max_dtr;
418 mmc_set_clock(host, max_dtr);
422 mmc_release_host(host);
424 err = mmc_register_card(card);
431 mmc_claim_host(host);
433 mmc_remove_card(card);
436 mmc_detach_bus(host);
437 mmc_release_host(host);