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mmc: core: eMMC bus width may not work on all platforms
[linux-2.6.git] / drivers / mmc / core / mmc.c
blob2a7e43bc796dfd1e798ad60a1ae6d0e7b98278a2
1 /*
2 * linux/drivers/mmc/core/mmc.c
3 *
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.
7 *
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.
11 */
12
13 #include <linux/err.h>
14 #include <linux/slab.h>
15
16 #include <linux/mmc/host.h>
17 #include <linux/mmc/card.h>
18 #include <linux/mmc/mmc.h>
19
20 #include "core.h"
21 #include "bus.h"
22 #include "mmc_ops.h"
23 #include "sd_ops.h"
24
25 static const unsigned int tran_exp[] = {
26 10000, 100000, 1000000, 10000000,
27 0, 0, 0, 0
28 };
29
30 static const unsigned char tran_mant[] = {
31 0, 10, 12, 13, 15, 20, 25, 30,
32 35, 40, 45, 50, 55, 60, 70, 80,
33 };
34
35 static const unsigned int tacc_exp[] = {
36 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
37 };
38
39 static const unsigned int tacc_mant[] = {
40 0, 10, 12, 13, 15, 20, 25, 30,
41 35, 40, 45, 50, 55, 60, 70, 80,
42 };
43
44 #define UNSTUFF_BITS(resp,start,size) \
45 ({ \
46 const int __size = size; \
47 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
48 const int __off = 3 - ((start) / 32); \
49 const int __shft = (start) & 31; \
50 u32 __res; \
51 \
52 __res = resp[__off] >> __shft; \
53 if (__size + __shft > 32) \
54 __res |= resp[__off-1] << ((32 - __shft) % 32); \
55 __res & __mask; \
56 })
57
58 /*
59 * Given the decoded CSD structure, decode the raw CID to our CID structure.
60 */
61 static int mmc_decode_cid(struct mmc_card *card)
62 {
63 u32 *resp = card->raw_cid;
64
65 /*
66 * The selection of the format here is based upon published
67 * specs from sandisk and from what people have reported.
68 */
69 switch (card->csd.mmca_vsn) {
70 case 0: /* MMC v1.0 - v1.2 */
71 case 1: /* MMC v1.4 */
72 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
73 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
74 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
75 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
76 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
77 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
78 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
79 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
80 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
81 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
82 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
83 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
84 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
85 break;
86
87 case 2: /* MMC v2.0 - v2.2 */
88 case 3: /* MMC v3.1 - v3.3 */
89 case 4: /* MMC v4 */
90 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
91 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
92 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
93 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
94 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
95 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
96 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
97 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
98 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
99 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
100 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
101 break;
102
103 default:
104 printk(KERN_ERR "%s: card has unknown MMCA version %d\n",
105 mmc_hostname(card->host), card->csd.mmca_vsn);
106 return -EINVAL;
107 }
108
109 return 0;
110 }
111
112 static void mmc_set_erase_size(struct mmc_card *card)
113 {
114 if (card->ext_csd.erase_group_def & 1)
115 card->erase_size = card->ext_csd.hc_erase_size;
116 else
117 card->erase_size = card->csd.erase_size;
118
119 mmc_init_erase(card);
120 }
121
122 /*
123 * Given a 128-bit response, decode to our card CSD structure.
124 */
125 static int mmc_decode_csd(struct mmc_card *card)
126 {
127 struct mmc_csd *csd = &card->csd;
128 unsigned int e, m, a, b;
129 u32 *resp = card->raw_csd;
130
131 /*
132 * We only understand CSD structure v1.1 and v1.2.
133 * v1.2 has extra information in bits 15, 11 and 10.
134 * We also support eMMC v4.4 & v4.41.
135 */
136 csd->structure = UNSTUFF_BITS(resp, 126, 2);
137 if (csd->structure == 0) {
138 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
139 mmc_hostname(card->host), csd->structure);
140 return -EINVAL;
141 }
142
143 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
144 m = UNSTUFF_BITS(resp, 115, 4);
145 e = UNSTUFF_BITS(resp, 112, 3);
146 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
147 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
148
149 m = UNSTUFF_BITS(resp, 99, 4);
150 e = UNSTUFF_BITS(resp, 96, 3);
151 csd->max_dtr = tran_exp[e] * tran_mant[m];
152 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
153
154 e = UNSTUFF_BITS(resp, 47, 3);
155 m = UNSTUFF_BITS(resp, 62, 12);
156 csd->capacity = (1 + m) << (e + 2);
157
158 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
159 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
160 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
161 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
162 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
163 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
164 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
165
166 if (csd->write_blkbits >= 9) {
167 a = UNSTUFF_BITS(resp, 42, 5);
168 b = UNSTUFF_BITS(resp, 37, 5);
169 csd->erase_size = (a + 1) * (b + 1);
170 csd->erase_size <<= csd->write_blkbits - 9;
171 }
172
173 return 0;
174 }
175
176 /*
177 * Read extended CSD.
178 */
179 static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
180 {
181 int err;
182 u8 *ext_csd;
183
184 BUG_ON(!card);
185 BUG_ON(!new_ext_csd);
186
187 *new_ext_csd = NULL;
188
189 if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
190 return 0;
191
192 /*
193 * As the ext_csd is so large and mostly unused, we don't store the
194 * raw block in mmc_card.
195 */
196 ext_csd = kmalloc(512, GFP_KERNEL);
197 if (!ext_csd) {
198 printk(KERN_ERR "%s: could not allocate a buffer to "
199 "receive the ext_csd.\n", mmc_hostname(card->host));
200 return -ENOMEM;
201 }
202
203 err = mmc_send_ext_csd(card, ext_csd);
204 if (err) {
205 kfree(ext_csd);
206 *new_ext_csd = NULL;
207
208 /* If the host or the card can't do the switch,
209 * fail more gracefully. */
210 if ((err != -EINVAL)
211 && (err != -ENOSYS)
212 && (err != -EFAULT))
213 return err;
214
215 /*
216 * High capacity cards should have this "magic" size
217 * stored in their CSD.
218 */
219 if (card->csd.capacity == (4096 * 512)) {
220 printk(KERN_ERR "%s: unable to read EXT_CSD "
221 "on a possible high capacity card. "
222 "Card will be ignored.\n",
223 mmc_hostname(card->host));
224 } else {
225 printk(KERN_WARNING "%s: unable to read "
226 "EXT_CSD, performance might "
227 "suffer.\n",
228 mmc_hostname(card->host));
229 err = 0;
230 }
231 } else
232 *new_ext_csd = ext_csd;
233
234 return err;
235 }
236
237 /*
238 * Decode extended CSD.
239 */
240 static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
241 {
242 int err = 0;
243
244 BUG_ON(!card);
245
246 if (!ext_csd)
247 return 0;
248
249 /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
250 if (card->csd.structure == 3) {
251 int ext_csd_struct = ext_csd[EXT_CSD_STRUCTURE];
252 if (ext_csd_struct > 2) {
253 printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
254 "version %d\n", mmc_hostname(card->host),
255 ext_csd_struct);
256 err = -EINVAL;
257 goto out;
258 }
259 }
260
261 card->ext_csd.rev = ext_csd[EXT_CSD_REV];
262 if (card->ext_csd.rev > 5) {
263 printk(KERN_ERR "%s: unrecognised EXT_CSD revision %d\n",
264 mmc_hostname(card->host), card->ext_csd.rev);
265 err = -EINVAL;
266 goto out;
267 }
268
269 if (card->ext_csd.rev >= 2) {
270 card->ext_csd.sectors =
271 ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
272 ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
273 ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
274 ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
275
276 /* Cards with density > 2GiB are sector addressed */
277 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
278 mmc_card_set_blockaddr(card);
279 }
280
281 switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
282 case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
283 EXT_CSD_CARD_TYPE_26:
284 card->ext_csd.hs_max_dtr = 52000000;
285 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
286 break;
287 case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
288 EXT_CSD_CARD_TYPE_26:
289 card->ext_csd.hs_max_dtr = 52000000;
290 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
291 break;
292 case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
293 EXT_CSD_CARD_TYPE_26:
294 card->ext_csd.hs_max_dtr = 52000000;
295 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
296 break;
297 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
298 card->ext_csd.hs_max_dtr = 52000000;
299 break;
300 case EXT_CSD_CARD_TYPE_26:
301 card->ext_csd.hs_max_dtr = 26000000;
302 break;
303 default:
304 /* MMC v4 spec says this cannot happen */
305 printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
306 "support any high-speed modes.\n",
307 mmc_hostname(card->host));
308 }
309
310 if (card->ext_csd.rev >= 3) {
311 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
312 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
313
314 /* EXT_CSD value is in units of 10ms, but we store in ms */
315 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
316
317 /* Sleep / awake timeout in 100ns units */
318 if (sa_shift > 0 && sa_shift <= 0x17)
319 card->ext_csd.sa_timeout =
320 1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
321 card->ext_csd.erase_group_def =
322 ext_csd[EXT_CSD_ERASE_GROUP_DEF];
323 card->ext_csd.hc_erase_timeout = 300 *
324 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
325 card->ext_csd.hc_erase_size =
326 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
327
328 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
329
330 /*
331 * There are two boot regions of equal size, defined in
332 * multiples of 128K.
333 */
334 card->ext_csd.boot_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
335 }
336
337 if (card->ext_csd.rev >= 4) {
338 /*
339 * Enhanced area feature support -- check whether the eMMC
340 * card has the Enhanced area enabled. If so, export enhanced
341 * area offset and size to user by adding sysfs interface.
342 */
343 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
344 (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
345 u8 hc_erase_grp_sz =
346 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
347 u8 hc_wp_grp_sz =
348 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
349
350 card->ext_csd.enhanced_area_en = 1;
351 /*
352 * calculate the enhanced data area offset, in bytes
353 */
354 card->ext_csd.enhanced_area_offset =
355 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
356 (ext_csd[137] << 8) + ext_csd[136];
357 if (mmc_card_blockaddr(card))
358 card->ext_csd.enhanced_area_offset <<= 9;
359 /*
360 * calculate the enhanced data area size, in kilobytes
361 */
362 card->ext_csd.enhanced_area_size =
363 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
364 ext_csd[140];
365 card->ext_csd.enhanced_area_size *=
366 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
367 card->ext_csd.enhanced_area_size <<= 9;
368 } else {
369 /*
370 * If the enhanced area is not enabled, disable these
371 * device attributes.
372 */
373 card->ext_csd.enhanced_area_offset = -EINVAL;
374 card->ext_csd.enhanced_area_size = -EINVAL;
375 }
376 card->ext_csd.sec_trim_mult =
377 ext_csd[EXT_CSD_SEC_TRIM_MULT];
378 card->ext_csd.sec_erase_mult =
379 ext_csd[EXT_CSD_SEC_ERASE_MULT];
380 card->ext_csd.sec_feature_support =
381 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
382 card->ext_csd.trim_timeout = 300 *
383 ext_csd[EXT_CSD_TRIM_MULT];
384 }
385
386 if (card->ext_csd.rev >= 5)
387 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
388
389 if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
390 card->erased_byte = 0xFF;
391 else
392 card->erased_byte = 0x0;
393
394 out:
395 return err;
396 }
397
398 static inline void mmc_free_ext_csd(u8 *ext_csd)
399 {
400 kfree(ext_csd);
401 }
402
403
404 static int mmc_compare_ext_csds(struct mmc_card *card, u8 *ext_csd,
405 unsigned bus_width)
406 {
407 u8 *bw_ext_csd;
408 int err;
409
410 err = mmc_get_ext_csd(card, &bw_ext_csd);
411 if (err)
412 return err;
413
414 if ((ext_csd == NULL || bw_ext_csd == NULL)) {
415 if (bus_width != MMC_BUS_WIDTH_1)
416 err = -EINVAL;
417 goto out;
418 }
419
420 if (bus_width == MMC_BUS_WIDTH_1)
421 goto out;
422
423 /* only compare read only fields */
424 err = (!(ext_csd[EXT_CSD_PARTITION_SUPPORT] ==
425 bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
426 (ext_csd[EXT_CSD_ERASED_MEM_CONT] ==
427 bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
428 (ext_csd[EXT_CSD_REV] ==
429 bw_ext_csd[EXT_CSD_REV]) &&
430 (ext_csd[EXT_CSD_STRUCTURE] ==
431 bw_ext_csd[EXT_CSD_STRUCTURE]) &&
432 (ext_csd[EXT_CSD_CARD_TYPE] ==
433 bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
434 (ext_csd[EXT_CSD_S_A_TIMEOUT] ==
435 bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
436 (ext_csd[EXT_CSD_HC_WP_GRP_SIZE] ==
437 bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
438 (ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT] ==
439 bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
440 (ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] ==
441 bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
442 (ext_csd[EXT_CSD_SEC_TRIM_MULT] ==
443 bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
444 (ext_csd[EXT_CSD_SEC_ERASE_MULT] ==
445 bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
446 (ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT] ==
447 bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
448 (ext_csd[EXT_CSD_TRIM_MULT] ==
449 bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
450 memcmp(&ext_csd[EXT_CSD_SEC_CNT],
451 &bw_ext_csd[EXT_CSD_SEC_CNT],
452 4) != 0);
453 if (err)
454 err = -EINVAL;
455
456 out:
457 mmc_free_ext_csd(bw_ext_csd);
458 return err;
459 }
460
461 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
462 card->raw_cid[2], card->raw_cid[3]);
463 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
464 card->raw_csd[2], card->raw_csd[3]);
465 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
466 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
467 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
468 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
469 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
470 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
471 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
472 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
473 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
474 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
475 card->ext_csd.enhanced_area_offset);
476 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
477
478 static struct attribute *mmc_std_attrs[] = {
479 &dev_attr_cid.attr,
480 &dev_attr_csd.attr,
481 &dev_attr_date.attr,
482 &dev_attr_erase_size.attr,
483 &dev_attr_preferred_erase_size.attr,
484 &dev_attr_fwrev.attr,
485 &dev_attr_hwrev.attr,
486 &dev_attr_manfid.attr,
487 &dev_attr_name.attr,
488 &dev_attr_oemid.attr,
489 &dev_attr_serial.attr,
490 &dev_attr_enhanced_area_offset.attr,
491 &dev_attr_enhanced_area_size.attr,
492 NULL,
493 };
494
495 static struct attribute_group mmc_std_attr_group = {
496 .attrs = mmc_std_attrs,
497 };
498
499 static const struct attribute_group *mmc_attr_groups[] = {
500 &mmc_std_attr_group,
501 NULL,
502 };
503
504 static struct device_type mmc_type = {
505 .groups = mmc_attr_groups,
506 };
507
508 /*
509 * Handle the detection and initialisation of a card.
510 *
511 * In the case of a resume, "oldcard" will contain the card
512 * we're trying to reinitialise.
513 */
514 static int mmc_init_card(struct mmc_host *host, u32 ocr,
515 struct mmc_card *oldcard)
516 {
517 struct mmc_card *card;
518 int err, ddr = 0;
519 u32 cid[4];
520 unsigned int max_dtr;
521 u32 rocr;
522 u8 *ext_csd = NULL;
523
524 BUG_ON(!host);
525 WARN_ON(!host->claimed);
526
527 /*
528 * Since we're changing the OCR value, we seem to
529 * need to tell some cards to go back to the idle
530 * state. We wait 1ms to give cards time to
531 * respond.
532 */
533 mmc_go_idle(host);
534
535 /* The extra bit indicates that we support high capacity */
536 err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
537 if (err)
538 goto err;
539
540 /*
541 * For SPI, enable CRC as appropriate.
542 */
543 if (mmc_host_is_spi(host)) {
544 err = mmc_spi_set_crc(host, use_spi_crc);
545 if (err)
546 goto err;
547 }
548
549 /*
550 * Fetch CID from card.
551 */
552 if (mmc_host_is_spi(host))
553 err = mmc_send_cid(host, cid);
554 else
555 err = mmc_all_send_cid(host, cid);
556 if (err)
557 goto err;
558
559 if (oldcard) {
560 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
561 err = -ENOENT;
562 goto err;
563 }
564
565 card = oldcard;
566 } else {
567 /*
568 * Allocate card structure.
569 */
570 card = mmc_alloc_card(host, &mmc_type);
571 if (IS_ERR(card)) {
572 err = PTR_ERR(card);
573 goto err;
574 }
575
576 card->type = MMC_TYPE_MMC;
577 card->rca = 1;
578 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
579 }
580
581 /*
582 * For native busses: set card RCA and quit open drain mode.
583 */
584 if (!mmc_host_is_spi(host)) {
585 err = mmc_set_relative_addr(card);
586 if (err)
587 goto free_card;
588
589 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
590 }
591
592 if (!oldcard) {
593 /*
594 * Fetch CSD from card.
595 */
596 err = mmc_send_csd(card, card->raw_csd);
597 if (err)
598 goto free_card;
599
600 err = mmc_decode_csd(card);
601 if (err)
602 goto free_card;
603 err = mmc_decode_cid(card);
604 if (err)
605 goto free_card;
606 }
607
608 /*
609 * Select card, as all following commands rely on that.
610 */
611 if (!mmc_host_is_spi(host)) {
612 err = mmc_select_card(card);
613 if (err)
614 goto free_card;
615 }
616
617 if (!oldcard) {
618 /*
619 * Fetch and process extended CSD.
620 */
621
622 err = mmc_get_ext_csd(card, &ext_csd);
623 if (err)
624 goto free_card;
625 err = mmc_read_ext_csd(card, ext_csd);
626 if (err)
627 goto free_card;
628
629 /* If doing byte addressing, check if required to do sector
630 * addressing. Handle the case of <2GB cards needing sector
631 * addressing. See section 8.1 JEDEC Standard JED84-A441;
632 * ocr register has bit 30 set for sector addressing.
633 */
634 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
635 mmc_card_set_blockaddr(card);
636
637 /* Erase size depends on CSD and Extended CSD */
638 mmc_set_erase_size(card);
639 }
640
641 /*
642 * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
643 * bit. This bit will be lost every time after a reset or power off.
644 */
645 if (card->ext_csd.enhanced_area_en) {
646 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
647 EXT_CSD_ERASE_GROUP_DEF, 1, 0);
648
649 if (err && err != -EBADMSG)
650 goto free_card;
651
652 if (err) {
653 err = 0;
654 /*
655 * Just disable enhanced area off & sz
656 * will try to enable ERASE_GROUP_DEF
657 * during next time reinit
658 */
659 card->ext_csd.enhanced_area_offset = -EINVAL;
660 card->ext_csd.enhanced_area_size = -EINVAL;
661 } else {
662 card->ext_csd.erase_group_def = 1;
663 /*
664 * enable ERASE_GRP_DEF successfully.
665 * This will affect the erase size, so
666 * here need to reset erase size
667 */
668 mmc_set_erase_size(card);
669 }
670 }
671
672 /*
673 * Ensure eMMC user default partition is enabled
674 */
675 if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
676 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
677 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
678 card->ext_csd.part_config,
679 card->ext_csd.part_time);
680 if (err && err != -EBADMSG)
681 goto free_card;
682 }
683
684 /*
685 * Activate high speed (if supported)
686 */
687 if ((card->ext_csd.hs_max_dtr != 0) &&
688 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
689 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
690 EXT_CSD_HS_TIMING, 1, 0);
691 if (err && err != -EBADMSG)
692 goto free_card;
693
694 if (err) {
695 printk(KERN_WARNING "%s: switch to highspeed failed\n",
696 mmc_hostname(card->host));
697 err = 0;
698 } else {
699 mmc_card_set_highspeed(card);
700 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
701 }
702 }
703
704 /*
705 * Compute bus speed.
706 */
707 max_dtr = (unsigned int)-1;
708
709 if (mmc_card_highspeed(card)) {
710 if (max_dtr > card->ext_csd.hs_max_dtr)
711 max_dtr = card->ext_csd.hs_max_dtr;
712 } else if (max_dtr > card->csd.max_dtr) {
713 max_dtr = card->csd.max_dtr;
714 }
715
716 mmc_set_clock(host, max_dtr);
717
718 /*
719 * Indicate DDR mode (if supported).
720 */
721 if (mmc_card_highspeed(card)) {
722 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
723 && ((host->caps & (MMC_CAP_1_8V_DDR |
724 MMC_CAP_UHS_DDR50))
725 == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
726 ddr = MMC_1_8V_DDR_MODE;
727 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
728 && ((host->caps & (MMC_CAP_1_2V_DDR |
729 MMC_CAP_UHS_DDR50))
730 == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
731 ddr = MMC_1_2V_DDR_MODE;
732 }
733
734 /*
735 * Activate wide bus and DDR (if supported).
736 */
737 if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
738 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
739 static unsigned ext_csd_bits[][2] = {
740 { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
741 { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
742 { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
743 };
744 static unsigned bus_widths[] = {
745 MMC_BUS_WIDTH_8,
746 MMC_BUS_WIDTH_4,
747 MMC_BUS_WIDTH_1
748 };
749 unsigned idx, bus_width = 0;
750
751 if (host->caps & MMC_CAP_8_BIT_DATA)
752 idx = 0;
753 else
754 idx = 1;
755 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
756 bus_width = bus_widths[idx];
757 if (bus_width == MMC_BUS_WIDTH_1)
758 ddr = 0; /* no DDR for 1-bit width */
759 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
760 EXT_CSD_BUS_WIDTH,
761 ext_csd_bits[idx][0],
762 0);
763 if (!err) {
764 mmc_set_bus_width(card->host, bus_width);
765
766 /*
767 * If controller can't handle bus width test,
768 * compare ext_csd previously read in 1 bit mode
769 * against ext_csd at new bus width
770 */
771 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
772 err = mmc_compare_ext_csds(card,
773 ext_csd,
774 bus_width);
775 else
776 err = mmc_bus_test(card, bus_width);
777 if (!err)
778 break;
779 }
780 }
781
782 if (!err && ddr) {
783 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
784 EXT_CSD_BUS_WIDTH,
785 ext_csd_bits[idx][1],
786 0);
787 }
788 if (err) {
789 printk(KERN_WARNING "%s: switch to bus width %d ddr %d "
790 "failed\n", mmc_hostname(card->host),
791 1 << bus_width, ddr);
792 goto free_card;
793 } else if (ddr) {
794 /*
795 * eMMC cards can support 3.3V to 1.2V i/o (vccq)
796 * signaling.
797 *
798 * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
799 *
800 * 1.8V vccq at 3.3V core voltage (vcc) is not required
801 * in the JEDEC spec for DDR.
802 *
803 * Do not force change in vccq since we are obviously
804 * working and no change to vccq is needed.
805 *
806 * WARNING: eMMC rules are NOT the same as SD DDR
807 */
808 if (ddr == EXT_CSD_CARD_TYPE_DDR_1_2V) {
809 err = mmc_set_signal_voltage(host,
810 MMC_SIGNAL_VOLTAGE_120, 0);
811 if (err)
812 goto err;
813 }
814 mmc_card_set_ddr_mode(card);
815 mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
816 mmc_set_bus_width(card->host, bus_width);
817 }
818 }
819
820 if (!oldcard)
821 host->card = card;
822
823 mmc_free_ext_csd(ext_csd);
824 return 0;
825
826 free_card:
827 if (!oldcard)
828 mmc_remove_card(card);
829 err:
830 mmc_free_ext_csd(ext_csd);
831
832 return err;
833 }
834
835 /*
836 * Host is being removed. Free up the current card.
837 */
838 static void mmc_remove(struct mmc_host *host)
839 {
840 BUG_ON(!host);
841 BUG_ON(!host->card);
842
843 mmc_remove_card(host->card);
844 host->card = NULL;
845 }
846
847 /*
848 * Card detection callback from host.
849 */
850 static void mmc_detect(struct mmc_host *host)
851 {
852 int err;
853
854 BUG_ON(!host);
855 BUG_ON(!host->card);
856
857 mmc_claim_host(host);
858
859 /*
860 * Just check if our card has been removed.
861 */
862 err = mmc_send_status(host->card, NULL);
863
864 mmc_release_host(host);
865
866 if (err) {
867 mmc_remove(host);
868
869 mmc_claim_host(host);
870 mmc_detach_bus(host);
871 mmc_release_host(host);
872 }
873 }
874
875 /*
876 * Suspend callback from host.
877 */
878 static int mmc_suspend(struct mmc_host *host)
879 {
880 BUG_ON(!host);
881 BUG_ON(!host->card);
882
883 mmc_claim_host(host);
884 if (!mmc_host_is_spi(host))
885 mmc_deselect_cards(host);
886 host->card->state &= ~MMC_STATE_HIGHSPEED;
887 mmc_release_host(host);
888
889 return 0;
890 }
891
892 /*
893 * Resume callback from host.
894 *
895 * This function tries to determine if the same card is still present
896 * and, if so, restore all state to it.
897 */
898 static int mmc_resume(struct mmc_host *host)
899 {
900 int err;
901
902 BUG_ON(!host);
903 BUG_ON(!host->card);
904
905 mmc_claim_host(host);
906 err = mmc_init_card(host, host->ocr, host->card);
907 mmc_release_host(host);
908
909 return err;
910 }
911
912 static int mmc_power_restore(struct mmc_host *host)
913 {
914 int ret;
915
916 host->card->state &= ~MMC_STATE_HIGHSPEED;
917 mmc_claim_host(host);
918 ret = mmc_init_card(host, host->ocr, host->card);
919 mmc_release_host(host);
920
921 return ret;
922 }
923
924 static int mmc_sleep(struct mmc_host *host)
925 {
926 struct mmc_card *card = host->card;
927 int err = -ENOSYS;
928
929 if (card && card->ext_csd.rev >= 3) {
930 err = mmc_card_sleepawake(host, 1);
931 if (err < 0)
932 pr_debug("%s: Error %d while putting card into sleep",
933 mmc_hostname(host), err);
934 }
935
936 return err;
937 }
938
939 static int mmc_awake(struct mmc_host *host)
940 {
941 struct mmc_card *card = host->card;
942 int err = -ENOSYS;
943
944 if (card && card->ext_csd.rev >= 3) {
945 err = mmc_card_sleepawake(host, 0);
946 if (err < 0)
947 pr_debug("%s: Error %d while awaking sleeping card",
948 mmc_hostname(host), err);
949 }
950
951 return err;
952 }
953
954 static const struct mmc_bus_ops mmc_ops = {
955 .awake = mmc_awake,
956 .sleep = mmc_sleep,
957 .remove = mmc_remove,
958 .detect = mmc_detect,
959 .suspend = NULL,
960 .resume = NULL,
961 .power_restore = mmc_power_restore,
962 };
963
964 static const struct mmc_bus_ops mmc_ops_unsafe = {
965 .awake = mmc_awake,
966 .sleep = mmc_sleep,
967 .remove = mmc_remove,
968 .detect = mmc_detect,
969 .suspend = mmc_suspend,
970 .resume = mmc_resume,
971 .power_restore = mmc_power_restore,
972 };
973
974 static void mmc_attach_bus_ops(struct mmc_host *host)
975 {
976 const struct mmc_bus_ops *bus_ops;
977
978 if (!mmc_card_is_removable(host))
979 bus_ops = &mmc_ops_unsafe;
980 else
981 bus_ops = &mmc_ops;
982 mmc_attach_bus(host, bus_ops);
983 }
984
985 /*
986 * Starting point for MMC card init.
987 */
988 int mmc_attach_mmc(struct mmc_host *host)
989 {
990 int err;
991 u32 ocr;
992
993 BUG_ON(!host);
994 WARN_ON(!host->claimed);
995
996 err = mmc_send_op_cond(host, 0, &ocr);
997 if (err)
998 return err;
999
1000 mmc_attach_bus_ops(host);
1001 if (host->ocr_avail_mmc)
1002 host->ocr_avail = host->ocr_avail_mmc;
1003
1004 /*
1005 * We need to get OCR a different way for SPI.
1006 */
1007 if (mmc_host_is_spi(host)) {
1008 err = mmc_spi_read_ocr(host, 1, &ocr);
1009 if (err)
1010 goto err;
1011 }
1012
1013 /*
1014 * Sanity check the voltages that the card claims to
1015 * support.
1016 */
1017 if (ocr & 0x7F) {
1018 printk(KERN_WARNING "%s: card claims to support voltages "
1019 "below the defined range. These will be ignored.\n",
1020 mmc_hostname(host));
1021 ocr &= ~0x7F;
1022 }
1023
1024 host->ocr = mmc_select_voltage(host, ocr);
1025
1026 /*
1027 * Can we support the voltage of the card?
1028 */
1029 if (!host->ocr) {
1030 err = -EINVAL;
1031 goto err;
1032 }
1033
1034 /*
1035 * Detect and init the card.
1036 */
1037 err = mmc_init_card(host, host->ocr, NULL);
1038 if (err)
1039 goto err;
1040
1041 mmc_release_host(host);
1042 err = mmc_add_card(host->card);
1043 mmc_claim_host(host);
1044 if (err)
1045 goto remove_card;
1046
1047 return 0;
1048
1049 remove_card:
1050 mmc_release_host(host);
1051 mmc_remove_card(host->card);
1052 mmc_claim_host(host);
1053 host->card = NULL;
1054 err:
1055 mmc_detach_bus(host);
1056
1057 printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
1058 mmc_hostname(host), err);
1059
1060 return err;
1061 }
Linus' kernel tree