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drm/radeon/kms: implement gpu lockup check for evergreen
[linux-2.6.git] / drivers / mmc / core / mmc.c
blob77f93c3b88086d5ee802da97ae03754d86c82e9a
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 card->ext_csd.sec_trim_mult =
306 ext_csd[EXT_CSD_SEC_TRIM_MULT];
307 card->ext_csd.sec_erase_mult =
308 ext_csd[EXT_CSD_SEC_ERASE_MULT];
309 card->ext_csd.sec_feature_support =
310 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
311 card->ext_csd.trim_timeout = 300 *
312 ext_csd[EXT_CSD_TRIM_MULT];
313 }
314
315 if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
316 card->erased_byte = 0xFF;
317 else
318 card->erased_byte = 0x0;
319
320 out:
321 kfree(ext_csd);
322
323 return err;
324 }
325
326 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
327 card->raw_cid[2], card->raw_cid[3]);
328 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
329 card->raw_csd[2], card->raw_csd[3]);
330 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
331 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
332 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
333 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
334 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
335 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
336 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
337 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
338 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
339
340 static struct attribute *mmc_std_attrs[] = {
341 &dev_attr_cid.attr,
342 &dev_attr_csd.attr,
343 &dev_attr_date.attr,
344 &dev_attr_erase_size.attr,
345 &dev_attr_preferred_erase_size.attr,
346 &dev_attr_fwrev.attr,
347 &dev_attr_hwrev.attr,
348 &dev_attr_manfid.attr,
349 &dev_attr_name.attr,
350 &dev_attr_oemid.attr,
351 &dev_attr_serial.attr,
352 NULL,
353 };
354
355 static struct attribute_group mmc_std_attr_group = {
356 .attrs = mmc_std_attrs,
357 };
358
359 static const struct attribute_group *mmc_attr_groups[] = {
360 &mmc_std_attr_group,
361 NULL,
362 };
363
364 static struct device_type mmc_type = {
365 .groups = mmc_attr_groups,
366 };
367
368 /*
369 * Handle the detection and initialisation of a card.
370 *
371 * In the case of a resume, "oldcard" will contain the card
372 * we're trying to reinitialise.
373 */
374 static int mmc_init_card(struct mmc_host *host, u32 ocr,
375 struct mmc_card *oldcard)
376 {
377 struct mmc_card *card;
378 int err, ddr = 0;
379 u32 cid[4];
380 unsigned int max_dtr;
381
382 BUG_ON(!host);
383 WARN_ON(!host->claimed);
384
385 /*
386 * Since we're changing the OCR value, we seem to
387 * need to tell some cards to go back to the idle
388 * state. We wait 1ms to give cards time to
389 * respond.
390 */
391 mmc_go_idle(host);
392
393 /* The extra bit indicates that we support high capacity */
394 err = mmc_send_op_cond(host, ocr | (1 << 30), NULL);
395 if (err)
396 goto err;
397
398 /*
399 * For SPI, enable CRC as appropriate.
400 */
401 if (mmc_host_is_spi(host)) {
402 err = mmc_spi_set_crc(host, use_spi_crc);
403 if (err)
404 goto err;
405 }
406
407 /*
408 * Fetch CID from card.
409 */
410 if (mmc_host_is_spi(host))
411 err = mmc_send_cid(host, cid);
412 else
413 err = mmc_all_send_cid(host, cid);
414 if (err)
415 goto err;
416
417 if (oldcard) {
418 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
419 err = -ENOENT;
420 goto err;
421 }
422
423 card = oldcard;
424 } else {
425 /*
426 * Allocate card structure.
427 */
428 card = mmc_alloc_card(host, &mmc_type);
429 if (IS_ERR(card)) {
430 err = PTR_ERR(card);
431 goto err;
432 }
433
434 card->type = MMC_TYPE_MMC;
435 card->rca = 1;
436 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
437 }
438
439 /*
440 * For native busses: set card RCA and quit open drain mode.
441 */
442 if (!mmc_host_is_spi(host)) {
443 err = mmc_set_relative_addr(card);
444 if (err)
445 goto free_card;
446
447 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
448 }
449
450 if (!oldcard) {
451 /*
452 * Fetch CSD from card.
453 */
454 err = mmc_send_csd(card, card->raw_csd);
455 if (err)
456 goto free_card;
457
458 err = mmc_decode_csd(card);
459 if (err)
460 goto free_card;
461 err = mmc_decode_cid(card);
462 if (err)
463 goto free_card;
464 }
465
466 /*
467 * Select card, as all following commands rely on that.
468 */
469 if (!mmc_host_is_spi(host)) {
470 err = mmc_select_card(card);
471 if (err)
472 goto free_card;
473 }
474
475 if (!oldcard) {
476 /*
477 * Fetch and process extended CSD.
478 */
479 err = mmc_read_ext_csd(card);
480 if (err)
481 goto free_card;
482 /* Erase size depends on CSD and Extended CSD */
483 mmc_set_erase_size(card);
484 }
485
486 /*
487 * Activate high speed (if supported)
488 */
489 if ((card->ext_csd.hs_max_dtr != 0) &&
490 (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
491 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
492 EXT_CSD_HS_TIMING, 1);
493 if (err && err != -EBADMSG)
494 goto free_card;
495
496 if (err) {
497 printk(KERN_WARNING "%s: switch to highspeed failed\n",
498 mmc_hostname(card->host));
499 err = 0;
500 } else {
501 mmc_card_set_highspeed(card);
502 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
503 }
504 }
505
506 /*
507 * Compute bus speed.
508 */
509 max_dtr = (unsigned int)-1;
510
511 if (mmc_card_highspeed(card)) {
512 if (max_dtr > card->ext_csd.hs_max_dtr)
513 max_dtr = card->ext_csd.hs_max_dtr;
514 } else if (max_dtr > card->csd.max_dtr) {
515 max_dtr = card->csd.max_dtr;
516 }
517
518 mmc_set_clock(host, max_dtr);
519
520 /*
521 * Indicate DDR mode (if supported).
522 */
523 if (mmc_card_highspeed(card)) {
524 if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
525 && (host->caps & (MMC_CAP_1_8V_DDR)))
526 ddr = MMC_1_8V_DDR_MODE;
527 else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
528 && (host->caps & (MMC_CAP_1_2V_DDR)))
529 ddr = MMC_1_2V_DDR_MODE;
530 }
531
532 /*
533 * Activate wide bus and DDR (if supported).
534 */
535 if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
536 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
537 unsigned ext_csd_bit, bus_width;
538
539 if (host->caps & MMC_CAP_8_BIT_DATA) {
540 if (ddr)
541 ext_csd_bit = EXT_CSD_DDR_BUS_WIDTH_8;
542 else
543 ext_csd_bit = EXT_CSD_BUS_WIDTH_8;
544 bus_width = MMC_BUS_WIDTH_8;
545 } else {
546 if (ddr)
547 ext_csd_bit = EXT_CSD_DDR_BUS_WIDTH_4;
548 else
549 ext_csd_bit = EXT_CSD_BUS_WIDTH_4;
550 bus_width = MMC_BUS_WIDTH_4;
551 }
552
553 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
554 EXT_CSD_BUS_WIDTH, ext_csd_bit);
555
556 if (err && err != -EBADMSG)
557 goto free_card;
558
559 if (err) {
560 printk(KERN_WARNING "%s: switch to bus width %d ddr %d "
561 "failed\n", mmc_hostname(card->host),
562 1 << bus_width, ddr);
563 err = 0;
564 } else {
565 if (ddr)
566 mmc_card_set_ddr_mode(card);
567 else
568 ddr = MMC_SDR_MODE;
569
570 mmc_set_bus_width_ddr(card->host, bus_width, ddr);
571 }
572 }
573
574 if (!oldcard)
575 host->card = card;
576
577 return 0;
578
579 free_card:
580 if (!oldcard)
581 mmc_remove_card(card);
582 err:
583
584 return err;
585 }
586
587 /*
588 * Host is being removed. Free up the current card.
589 */
590 static void mmc_remove(struct mmc_host *host)
591 {
592 BUG_ON(!host);
593 BUG_ON(!host->card);
594
595 mmc_remove_card(host->card);
596 host->card = NULL;
597 }
598
599 /*
600 * Card detection callback from host.
601 */
602 static void mmc_detect(struct mmc_host *host)
603 {
604 int err;
605
606 BUG_ON(!host);
607 BUG_ON(!host->card);
608
609 mmc_claim_host(host);
610
611 /*
612 * Just check if our card has been removed.
613 */
614 err = mmc_send_status(host->card, NULL);
615
616 mmc_release_host(host);
617
618 if (err) {
619 mmc_remove(host);
620
621 mmc_claim_host(host);
622 mmc_detach_bus(host);
623 mmc_release_host(host);
624 }
625 }
626
627 /*
628 * Suspend callback from host.
629 */
630 static int mmc_suspend(struct mmc_host *host)
631 {
632 BUG_ON(!host);
633 BUG_ON(!host->card);
634
635 mmc_claim_host(host);
636 if (!mmc_host_is_spi(host))
637 mmc_deselect_cards(host);
638 host->card->state &= ~MMC_STATE_HIGHSPEED;
639 mmc_release_host(host);
640
641 return 0;
642 }
643
644 /*
645 * Resume callback from host.
646 *
647 * This function tries to determine if the same card is still present
648 * and, if so, restore all state to it.
649 */
650 static int mmc_resume(struct mmc_host *host)
651 {
652 int err;
653
654 BUG_ON(!host);
655 BUG_ON(!host->card);
656
657 mmc_claim_host(host);
658 err = mmc_init_card(host, host->ocr, host->card);
659 mmc_release_host(host);
660
661 return err;
662 }
663
664 static int mmc_power_restore(struct mmc_host *host)
665 {
666 int ret;
667
668 host->card->state &= ~MMC_STATE_HIGHSPEED;
669 mmc_claim_host(host);
670 ret = mmc_init_card(host, host->ocr, host->card);
671 mmc_release_host(host);
672
673 return ret;
674 }
675
676 static int mmc_sleep(struct mmc_host *host)
677 {
678 struct mmc_card *card = host->card;
679 int err = -ENOSYS;
680
681 if (card && card->ext_csd.rev >= 3) {
682 err = mmc_card_sleepawake(host, 1);
683 if (err < 0)
684 pr_debug("%s: Error %d while putting card into sleep",
685 mmc_hostname(host), err);
686 }
687
688 return err;
689 }
690
691 static int mmc_awake(struct mmc_host *host)
692 {
693 struct mmc_card *card = host->card;
694 int err = -ENOSYS;
695
696 if (card && card->ext_csd.rev >= 3) {
697 err = mmc_card_sleepawake(host, 0);
698 if (err < 0)
699 pr_debug("%s: Error %d while awaking sleeping card",
700 mmc_hostname(host), err);
701 }
702
703 return err;
704 }
705
706 static const struct mmc_bus_ops mmc_ops = {
707 .awake = mmc_awake,
708 .sleep = mmc_sleep,
709 .remove = mmc_remove,
710 .detect = mmc_detect,
711 .suspend = NULL,
712 .resume = NULL,
713 .power_restore = mmc_power_restore,
714 };
715
716 static const struct mmc_bus_ops mmc_ops_unsafe = {
717 .awake = mmc_awake,
718 .sleep = mmc_sleep,
719 .remove = mmc_remove,
720 .detect = mmc_detect,
721 .suspend = mmc_suspend,
722 .resume = mmc_resume,
723 .power_restore = mmc_power_restore,
724 };
725
726 static void mmc_attach_bus_ops(struct mmc_host *host)
727 {
728 const struct mmc_bus_ops *bus_ops;
729
730 if (!mmc_card_is_removable(host))
731 bus_ops = &mmc_ops_unsafe;
732 else
733 bus_ops = &mmc_ops;
734 mmc_attach_bus(host, bus_ops);
735 }
736
737 /*
738 * Starting point for MMC card init.
739 */
740 int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
741 {
742 int err;
743
744 BUG_ON(!host);
745 WARN_ON(!host->claimed);
746
747 mmc_attach_bus_ops(host);
748
749 /*
750 * We need to get OCR a different way for SPI.
751 */
752 if (mmc_host_is_spi(host)) {
753 err = mmc_spi_read_ocr(host, 1, &ocr);
754 if (err)
755 goto err;
756 }
757
758 /*
759 * Sanity check the voltages that the card claims to
760 * support.
761 */
762 if (ocr & 0x7F) {
763 printk(KERN_WARNING "%s: card claims to support voltages "
764 "below the defined range. These will be ignored.\n",
765 mmc_hostname(host));
766 ocr &= ~0x7F;
767 }
768
769 host->ocr = mmc_select_voltage(host, ocr);
770
771 /*
772 * Can we support the voltage of the card?
773 */
774 if (!host->ocr) {
775 err = -EINVAL;
776 goto err;
777 }
778
779 /*
780 * Detect and init the card.
781 */
782 err = mmc_init_card(host, host->ocr, NULL);
783 if (err)
784 goto err;
785
786 mmc_release_host(host);
787
788 err = mmc_add_card(host->card);
789 if (err)
790 goto remove_card;
791
792 return 0;
793
794 remove_card:
795 mmc_remove_card(host->card);
796 host->card = NULL;
797 mmc_claim_host(host);
798 err:
799 mmc_detach_bus(host);
800 mmc_release_host(host);
801
802 printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
803 mmc_hostname(host), err);
804
805 return err;
806 }
Linus' kernel tree