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mmc: core: comment on why sdio_reset is done at init time
[deliverable/linux.git] / drivers / mmc / core / mmc.c
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
24 static const unsigned int tran_exp[] = {
25 10000, 100000, 1000000, 10000000,
26 0, 0, 0, 0
27 };
28
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,
32 };
33
34 static const unsigned int tacc_exp[] = {
35 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
36 };
37
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,
41 };
42
43 #define UNSTUFF_BITS(resp,start,size) \
44 ({ \
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; \
49 u32 __res; \
50 \
51 __res = resp[__off] >> __shft; \
52 if (__size + __shft > 32) \
53 __res |= resp[__off-1] << ((32 - __shft) % 32); \
54 __res & __mask; \
55 })
56
57 /*
58 * Given the decoded CSD structure, decode the raw CID to our CID structure.
59 */
60 static int mmc_decode_cid(struct mmc_card *card)
61 {
62 u32 *resp = card->raw_cid;
63
64 /*
65 * The selection of the format here is based upon published
66 * specs from sandisk and from what people have reported.
67 */
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;
84 break;
85
86 case 2: /* MMC v2.0 - v2.2 */
87 case 3: /* MMC v3.1 - v3.3 */
88 case 4: /* MMC v4 */
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;
100 break;
101
102 default:
103 printk(KERN_ERR "%s: card has unknown MMCA version %d\n",
104 mmc_hostname(card->host), card->csd.mmca_vsn);
105 return -EINVAL;
106 }
107
108 return 0;
109 }
110
111 static void mmc_set_erase_size(struct mmc_card *card)
112 {
113 if (card->ext_csd.erase_group_def & 1)
114 card->erase_size = card->ext_csd.hc_erase_size;
115 else
116 card->erase_size = card->csd.erase_size;
117
118 mmc_init_erase(card);
119 }
120
121 /*
122 * Given a 128-bit response, decode to our card CSD structure.
123 */
124 static int mmc_decode_csd(struct mmc_card *card)
125 {
126 struct mmc_csd *csd = &card->csd;
127 unsigned int e, m, a, b;
128 u32 *resp = card->raw_csd;
129
130 /*
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.
134 */
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);
139 return -EINVAL;
140 }
141
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;
147
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);
152
153 e = UNSTUFF_BITS(resp, 47, 3);
154 m = UNSTUFF_BITS(resp, 62, 12);
155 csd->capacity = (1 + m) << (e + 2);
156
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);
164
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;
170 }
171
172 return 0;
173 }
174
175 /*
176 * Read and decode extended CSD.
177 */
178 static int mmc_read_ext_csd(struct mmc_card *card)
179 {
180 int err;
181 u8 *ext_csd;
182
183 BUG_ON(!card);
184
185 if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
186 return 0;
187
188 /*
189 * As the ext_csd is so large and mostly unused, we don't store the
190 * raw block in mmc_card.
191 */
192 ext_csd = kmalloc(512, GFP_KERNEL);
193 if (!ext_csd) {
194 printk(KERN_ERR "%s: could not allocate a buffer to "
195 "receive the ext_csd.\n", mmc_hostname(card->host));
196 return -ENOMEM;
197 }
198
199 err = mmc_send_ext_csd(card, ext_csd);
200 if (err) {
201 /* If the host or the card can't do the switch,
202 * fail more gracefully. */
203 if ((err != -EINVAL)
204 && (err != -ENOSYS)
205 && (err != -EFAULT))
206 goto out;
207
208 /*
209 * High capacity cards should have this "magic" size
210 * stored in their CSD.
211 */
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));
217 } else {
218 printk(KERN_WARNING "%s: unable to read "
219 "EXT_CSD, performance might "
220 "suffer.\n",
221 mmc_hostname(card->host));
222 err = 0;
223 }
224
225 goto out;
226 }
227
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),
234 ext_csd_struct);
235 err = -EINVAL;
236 goto out;
237 }
238 }
239
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);
244 err = -EINVAL;
245 goto out;
246 }
247
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;
254
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);
258 }
259
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 |
262 EXT_CSD_CARD_TYPE_26:
263 card->ext_csd.hs_max_dtr = 52000000;
264 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
265 break;
266 case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
267 EXT_CSD_CARD_TYPE_26:
268 card->ext_csd.hs_max_dtr = 52000000;
269 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
270 break;
271 case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
272 EXT_CSD_CARD_TYPE_26:
273 card->ext_csd.hs_max_dtr = 52000000;
274 card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
275 break;
276 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
277 card->ext_csd.hs_max_dtr = 52000000;
278 break;
279 case EXT_CSD_CARD_TYPE_26:
280 card->ext_csd.hs_max_dtr = 26000000;
281 break;
282 default:
283 /* MMC v4 spec says this cannot happen */
284 printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
285 "support any high-speed modes.\n",
286 mmc_hostname(card->host));
287 }
288
289 if (card->ext_csd.rev >= 3) {
290 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
291
292 /* Sleep / awake timeout in 100ns units */
293 if (sa_shift > 0 && sa_shift <= 0x17)
294 card->ext_csd.sa_timeout =
295 1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
296 card->ext_csd.erase_group_def =
297 ext_csd[EXT_CSD_ERASE_GROUP_DEF];
298 card->ext_csd.hc_erase_timeout = 300 *
299 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
300 card->ext_csd.hc_erase_size =
301 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
302 }
303
304 if (card->ext_csd.rev >= 4) {
305 /*
306 * Enhanced area feature support -- check whether the eMMC
307 * card has the Enhanced area enabled. If so, export enhanced
308 * area offset and size to user by adding sysfs interface.
309 */
310 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
311 (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
312 u8 hc_erase_grp_sz =
313 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
314 u8 hc_wp_grp_sz =
315 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
316
317 card->ext_csd.enhanced_area_en = 1;
318 /*
319 * calculate the enhanced data area offset, in bytes
320 */
321 card->ext_csd.enhanced_area_offset =
322 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
323 (ext_csd[137] << 8) + ext_csd[136];
324 if (mmc_card_blockaddr(card))
325 card->ext_csd.enhanced_area_offset <<= 9;
326 /*
327 * calculate the enhanced data area size, in kilobytes
328 */
329 card->ext_csd.enhanced_area_size =
330 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
331 ext_csd[140];
332 card->ext_csd.enhanced_area_size *=
333 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
334 card->ext_csd.enhanced_area_size <<= 9;
335 } else {
336 /*
337 * If the enhanced area is not enabled, disable these
338 * device attributes.
339 */
340 card->ext_csd.enhanced_area_offset = -EINVAL;
341 card->ext_csd.enhanced_area_size = -EINVAL;
342 }
343 card->ext_csd.sec_trim_mult =
344 ext_csd[EXT_CSD_SEC_TRIM_MULT];
345 card->ext_csd.sec_erase_mult =
346 ext_csd[EXT_CSD_SEC_ERASE_MULT];
347 card->ext_csd.sec_feature_support =
348 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
349 card->ext_csd.trim_timeout = 300 *
350 ext_csd[EXT_CSD_TRIM_MULT];
351 }
352
353 if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
354 card->erased_byte = 0xFF;
355 else
356 card->erased_byte = 0x0;
357
358 out:
359 kfree(ext_csd);
360
361 return err;
362 }
363
364 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
365 card->raw_cid[2], card->raw_cid[3]);
366 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
367 card->raw_csd[2], card->raw_csd[3]);
368 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
369 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
370 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
371 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
372 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
373 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
374 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
375 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
376 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
377 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
378 card->ext_csd.enhanced_area_offset);
379 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
380
381 static struct attribute *mmc_std_attrs[] = {
382 &dev_attr_cid.attr,
383 &dev_attr_csd.attr,
384 &dev_attr_date.attr,
385 &dev_attr_erase_size.attr,
386 &dev_attr_preferred_erase_size.attr,
387 &dev_attr_fwrev.attr,
388 &dev_attr_hwrev.attr,
389 &dev_attr_manfid.attr,
390 &dev_attr_name.attr,
391 &dev_attr_oemid.attr,
392 &dev_attr_serial.attr,
393 &dev_attr_enhanced_area_offset.attr,
394 &dev_attr_enhanced_area_size.attr,
395 NULL,
396 };
397
398 static struct attribute_group mmc_std_attr_group = {
399 .attrs = mmc_std_attrs,
400 };
401
402 static const struct attribute_group *mmc_attr_groups[] = {
403 &mmc_std_attr_group,
404 NULL,
405 };
406
407 static struct device_type mmc_type = {
408 .groups = mmc_attr_groups,
409 };
410
411 /*
412 * Handle the detection and initialisation of a card.
413 *
414 * In the case of a resume, "oldcard" will contain the card
415 * we're trying to reinitialise.
416 */
417 static int mmc_init_card(struct mmc_host *host, u32 ocr,
418 struct mmc_card *oldcard)
419 {
420 struct mmc_card *card;
421 int err, ddr = 0;
422 u32 cid[4];
423 unsigned int max_dtr;
424
425 BUG_ON(!host);
426 WARN_ON(!host->claimed);
427
428 /*
429 * Since we're changing the OCR value, we seem to
430 * need to tell some cards to go back to the idle
431 * state. We wait 1ms to give cards time to
432 * respond.
433 */
434 mmc_go_idle(host);
435
436 /* The extra bit indicates that we support high capacity */
437 err = mmc_send_op_cond(host, ocr | (1 << 30), NULL);
438 if (err)
439 goto err;
440
441 /*
442 * For SPI, enable CRC as appropriate.
443 */
444 if (mmc_host_is_spi(host)) {
445 err = mmc_spi_set_crc(host, use_spi_crc);
446 if (err)
447 goto err;
448 }
449
450 /*
451 * Fetch CID from card.
452 */
453 if (mmc_host_is_spi(host))
454 err = mmc_send_cid(host, cid);
455 else
456 err = mmc_all_send_cid(host, cid);
457 if (err)
458 goto err;
459
460 if (oldcard) {
461 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
462 err = -ENOENT;
463 goto err;
464 }
465
466 card = oldcard;
467 } else {
468 /*
469 * Allocate card structure.
470 */
471 card = mmc_alloc_card(host, &mmc_type);
472 if (IS_ERR(card)) {
473 err = PTR_ERR(card);
474 goto err;
475 }
476
477 card->type = MMC_TYPE_MMC;
478 card->rca = 1;
479 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
480 }
481
482 /*
483 * For native busses: set card RCA and quit open drain mode.
484 */
485 if (!mmc_host_is_spi(host)) {
486 err = mmc_set_relative_addr(card);
487 if (err)
488 goto free_card;
489
490 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
491 }
492
493 if (!oldcard) {
494 /*
495 * Fetch CSD from card.
496 */
497 err = mmc_send_csd(card, card->raw_csd);
498 if (err)
499 goto free_card;
500
501 err = mmc_decode_csd(card);
502 if (err)
503 goto free_card;
504 err = mmc_decode_cid(card);
505 if (err)
506 goto free_card;
507 }
508
509 /*
510 * Select card, as all following commands rely on that.
511 */
512 if (!mmc_host_is_spi(host)) {
513 err = mmc_select_card(card);
514 if (err)
515 goto free_card;
516 }
517
518 if (!oldcard) {
519 /*
520 * Fetch and process extended CSD.
521 */
522 err = mmc_read_ext_csd(card);
523 if (err)
524 goto free_card;
525 /* Erase size depends on CSD and Extended CSD */
526 mmc_set_erase_size(card);
527 }
528
529 /*
530 * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
531 * bit. This bit will be lost everytime after a reset or power off.
532 */
533 if (card->ext_csd.enhanced_area_en) {
534 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
535 EXT_CSD_ERASE_GROUP_DEF, 1);
536
537 if (err && err != -EBADMSG)
538 goto free_card;
539
540 if (err) {
541 err = 0;
542 /*
543 * Just disable enhanced area off & sz
544 * will try to enable ERASE_GROUP_DEF
545 * during next time reinit
546 */
547 card->ext_csd.enhanced_area_offset = -EINVAL;
548 card->ext_csd.enhanced_area_size = -EINVAL;
549 } else {
550 card->ext_csd.erase_group_def = 1;
551 /*
552 * enable ERASE_GRP_DEF successfully.
553 * This will affect the erase size, so
554 * here need to reset erase size
555 */
556 mmc_set_erase_size(card);
557 }
558 }
559
560 /*
561 * Activate high speed (if supported)
562 */
563 if ((card->ext_csd.hs_max_dtr != 0) &&
564 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
565 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
566 EXT_CSD_HS_TIMING, 1);
567 if (err && err != -EBADMSG)
568 goto free_card;
569
570 if (err) {
571 printk(KERN_WARNING "%s: switch to highspeed failed\n",
572 mmc_hostname(card->host));
573 err = 0;
574 } else {
575 mmc_card_set_highspeed(card);
576 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
577 }
578 }
579
580 /*
581 * Compute bus speed.
582 */
583 max_dtr = (unsigned int)-1;
584
585 if (mmc_card_highspeed(card)) {
586 if (max_dtr > card->ext_csd.hs_max_dtr)
587 max_dtr = card->ext_csd.hs_max_dtr;
588 } else if (max_dtr > card->csd.max_dtr) {
589 max_dtr = card->csd.max_dtr;
590 }
591
592 mmc_set_clock(host, max_dtr);
593
594 /*
595 * Indicate DDR mode (if supported).
596 */
597 if (mmc_card_highspeed(card)) {
598 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
599 && (host->caps & (MMC_CAP_1_8V_DDR)))
600 ddr = MMC_1_8V_DDR_MODE;
601 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
602 && (host->caps & (MMC_CAP_1_2V_DDR)))
603 ddr = MMC_1_2V_DDR_MODE;
604 }
605
606 /*
607 * Activate wide bus and DDR (if supported).
608 */
609 if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
610 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
611 static unsigned ext_csd_bits[][2] = {
612 { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
613 { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
614 { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
615 };
616 static unsigned bus_widths[] = {
617 MMC_BUS_WIDTH_8,
618 MMC_BUS_WIDTH_4,
619 MMC_BUS_WIDTH_1
620 };
621 unsigned idx, bus_width = 0;
622
623 if (host->caps & MMC_CAP_8_BIT_DATA)
624 idx = 0;
625 else
626 idx = 1;
627 for (; idx < ARRAY_SIZE(bus_widths); idx++) {
628 bus_width = bus_widths[idx];
629 if (bus_width == MMC_BUS_WIDTH_1)
630 ddr = 0; /* no DDR for 1-bit width */
631 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
632 EXT_CSD_BUS_WIDTH,
633 ext_csd_bits[idx][0]);
634 if (!err) {
635 mmc_set_bus_width_ddr(card->host,
636 bus_width, MMC_SDR_MODE);
637 /*
638 * If controller can't handle bus width test,
639 * use the highest bus width to maintain
640 * compatibility with previous MMC behavior.
641 */
642 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
643 break;
644 err = mmc_bus_test(card, bus_width);
645 if (!err)
646 break;
647 }
648 }
649
650 if (!err && ddr) {
651 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
652 EXT_CSD_BUS_WIDTH,
653 ext_csd_bits[idx][1]);
654 }
655 if (err) {
656 printk(KERN_WARNING "%s: switch to bus width %d ddr %d "
657 "failed\n", mmc_hostname(card->host),
658 1 << bus_width, ddr);
659 goto free_card;
660 } else if (ddr) {
661 mmc_card_set_ddr_mode(card);
662 mmc_set_bus_width_ddr(card->host, bus_width, ddr);
663 }
664 }
665
666 if (!oldcard)
667 host->card = card;
668
669 return 0;
670
671 free_card:
672 if (!oldcard)
673 mmc_remove_card(card);
674 err:
675
676 return err;
677 }
678
679 /*
680 * Host is being removed. Free up the current card.
681 */
682 static void mmc_remove(struct mmc_host *host)
683 {
684 BUG_ON(!host);
685 BUG_ON(!host->card);
686
687 mmc_remove_card(host->card);
688 host->card = NULL;
689 }
690
691 /*
692 * Card detection callback from host.
693 */
694 static void mmc_detect(struct mmc_host *host)
695 {
696 int err;
697
698 BUG_ON(!host);
699 BUG_ON(!host->card);
700
701 mmc_claim_host(host);
702
703 /*
704 * Just check if our card has been removed.
705 */
706 err = mmc_send_status(host->card, NULL);
707
708 mmc_release_host(host);
709
710 if (err) {
711 mmc_remove(host);
712
713 mmc_claim_host(host);
714 mmc_detach_bus(host);
715 mmc_release_host(host);
716 }
717 }
718
719 /*
720 * Suspend callback from host.
721 */
722 static int mmc_suspend(struct mmc_host *host)
723 {
724 BUG_ON(!host);
725 BUG_ON(!host->card);
726
727 mmc_claim_host(host);
728 if (!mmc_host_is_spi(host))
729 mmc_deselect_cards(host);
730 host->card->state &= ~MMC_STATE_HIGHSPEED;
731 mmc_release_host(host);
732
733 return 0;
734 }
735
736 /*
737 * Resume callback from host.
738 *
739 * This function tries to determine if the same card is still present
740 * and, if so, restore all state to it.
741 */
742 static int mmc_resume(struct mmc_host *host)
743 {
744 int err;
745
746 BUG_ON(!host);
747 BUG_ON(!host->card);
748
749 mmc_claim_host(host);
750 err = mmc_init_card(host, host->ocr, host->card);
751 mmc_release_host(host);
752
753 return err;
754 }
755
756 static int mmc_power_restore(struct mmc_host *host)
757 {
758 int ret;
759
760 host->card->state &= ~MMC_STATE_HIGHSPEED;
761 mmc_claim_host(host);
762 ret = mmc_init_card(host, host->ocr, host->card);
763 mmc_release_host(host);
764
765 return ret;
766 }
767
768 static int mmc_sleep(struct mmc_host *host)
769 {
770 struct mmc_card *card = host->card;
771 int err = -ENOSYS;
772
773 if (card && card->ext_csd.rev >= 3) {
774 err = mmc_card_sleepawake(host, 1);
775 if (err < 0)
776 pr_debug("%s: Error %d while putting card into sleep",
777 mmc_hostname(host), err);
778 }
779
780 return err;
781 }
782
783 static int mmc_awake(struct mmc_host *host)
784 {
785 struct mmc_card *card = host->card;
786 int err = -ENOSYS;
787
788 if (card && card->ext_csd.rev >= 3) {
789 err = mmc_card_sleepawake(host, 0);
790 if (err < 0)
791 pr_debug("%s: Error %d while awaking sleeping card",
792 mmc_hostname(host), err);
793 }
794
795 return err;
796 }
797
798 static const struct mmc_bus_ops mmc_ops = {
799 .awake = mmc_awake,
800 .sleep = mmc_sleep,
801 .remove = mmc_remove,
802 .detect = mmc_detect,
803 .suspend = NULL,
804 .resume = NULL,
805 .power_restore = mmc_power_restore,
806 };
807
808 static const struct mmc_bus_ops mmc_ops_unsafe = {
809 .awake = mmc_awake,
810 .sleep = mmc_sleep,
811 .remove = mmc_remove,
812 .detect = mmc_detect,
813 .suspend = mmc_suspend,
814 .resume = mmc_resume,
815 .power_restore = mmc_power_restore,
816 };
817
818 static void mmc_attach_bus_ops(struct mmc_host *host)
819 {
820 const struct mmc_bus_ops *bus_ops;
821
822 if (!mmc_card_is_removable(host))
823 bus_ops = &mmc_ops_unsafe;
824 else
825 bus_ops = &mmc_ops;
826 mmc_attach_bus(host, bus_ops);
827 }
828
829 /*
830 * Starting point for MMC card init.
831 */
832 int mmc_attach_mmc(struct mmc_host *host)
833 {
834 int err;
835 u32 ocr;
836
837 BUG_ON(!host);
838 WARN_ON(!host->claimed);
839
840 err = mmc_send_op_cond(host, 0, &ocr);
841 if (err)
842 return err;
843
844 mmc_attach_bus_ops(host);
845 if (host->ocr_avail_mmc)
846 host->ocr_avail = host->ocr_avail_mmc;
847
848 /*
849 * We need to get OCR a different way for SPI.
850 */
851 if (mmc_host_is_spi(host)) {
852 err = mmc_spi_read_ocr(host, 1, &ocr);
853 if (err)
854 goto err;
855 }
856
857 /*
858 * Sanity check the voltages that the card claims to
859 * support.
860 */
861 if (ocr & 0x7F) {
862 printk(KERN_WARNING "%s: card claims to support voltages "
863 "below the defined range. These will be ignored.\n",
864 mmc_hostname(host));
865 ocr &= ~0x7F;
866 }
867
868 host->ocr = mmc_select_voltage(host, ocr);
869
870 /*
871 * Can we support the voltage of the card?
872 */
873 if (!host->ocr) {
874 err = -EINVAL;
875 goto err;
876 }
877
878 /*
879 * Detect and init the card.
880 */
881 err = mmc_init_card(host, host->ocr, NULL);
882 if (err)
883 goto err;
884
885 mmc_release_host(host);
886 err = mmc_add_card(host->card);
887 mmc_claim_host(host);
888 if (err)
889 goto remove_card;
890
891 return 0;
892
893 remove_card:
894 mmc_release_host(host);
895 mmc_remove_card(host->card);
896 mmc_claim_host(host);
897 host->card = NULL;
898 err:
899 mmc_detach_bus(host);
900
901 printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
902 mmc_hostname(host), err);
903
904 return err;
905 }
Linux kernel - Deliverables
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