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Commit | Line | Data |
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7ea239d9 | 1 | /* |
70f10482 | 2 | * linux/drivers/mmc/core/sd.c |
7ea239d9 PO |
3 | * |
4 | * Copyright (C) 2003-2004 Russell King, All Rights Reserved. | |
5 | * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. | |
6 | * Copyright (C) 2005-2007 Pierre Ossman, 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 | ||
15 | #include <linux/mmc/host.h> | |
16 | #include <linux/mmc/card.h> | |
17 | #include <linux/mmc/mmc.h> | |
3373c0ae | 18 | #include <linux/mmc/sd.h> |
7ea239d9 PO |
19 | |
20 | #include "core.h" | |
21 | #include "sysfs.h" | |
4101c16a | 22 | #include "bus.h" |
7ea239d9 PO |
23 | #include "mmc_ops.h" |
24 | #include "sd_ops.h" | |
25 | ||
7ea239d9 PO |
26 | static const unsigned int tran_exp[] = { |
27 | 10000, 100000, 1000000, 10000000, | |
28 | 0, 0, 0, 0 | |
29 | }; | |
30 | ||
31 | static const unsigned char tran_mant[] = { | |
32 | 0, 10, 12, 13, 15, 20, 25, 30, | |
33 | 35, 40, 45, 50, 55, 60, 70, 80, | |
34 | }; | |
35 | ||
36 | static const unsigned int tacc_exp[] = { | |
37 | 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, | |
38 | }; | |
39 | ||
40 | static const unsigned int tacc_mant[] = { | |
41 | 0, 10, 12, 13, 15, 20, 25, 30, | |
42 | 35, 40, 45, 50, 55, 60, 70, 80, | |
43 | }; | |
44 | ||
45 | #define UNSTUFF_BITS(resp,start,size) \ | |
46 | ({ \ | |
47 | const int __size = size; \ | |
48 | const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ | |
49 | const int __off = 3 - ((start) / 32); \ | |
50 | const int __shft = (start) & 31; \ | |
51 | u32 __res; \ | |
52 | \ | |
53 | __res = resp[__off] >> __shft; \ | |
54 | if (__size + __shft > 32) \ | |
55 | __res |= resp[__off-1] << ((32 - __shft) % 32); \ | |
56 | __res & __mask; \ | |
57 | }) | |
58 | ||
59 | /* | |
60 | * Given the decoded CSD structure, decode the raw CID to our CID structure. | |
61 | */ | |
62 | static void mmc_decode_cid(struct mmc_card *card) | |
63 | { | |
64 | u32 *resp = card->raw_cid; | |
65 | ||
66 | memset(&card->cid, 0, sizeof(struct mmc_cid)); | |
67 | ||
68 | /* | |
69 | * SD doesn't currently have a version field so we will | |
70 | * have to assume we can parse this. | |
71 | */ | |
72 | card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); | |
73 | card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); | |
74 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
75 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
76 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
77 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
78 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
79 | card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); | |
80 | card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); | |
81 | card->cid.serial = UNSTUFF_BITS(resp, 24, 32); | |
82 | card->cid.year = UNSTUFF_BITS(resp, 12, 8); | |
83 | card->cid.month = UNSTUFF_BITS(resp, 8, 4); | |
84 | ||
85 | card->cid.year += 2000; /* SD cards year offset */ | |
86 | } | |
87 | ||
88 | /* | |
89 | * Given a 128-bit response, decode to our card CSD structure. | |
90 | */ | |
bd766312 | 91 | static int mmc_decode_csd(struct mmc_card *card) |
7ea239d9 PO |
92 | { |
93 | struct mmc_csd *csd = &card->csd; | |
94 | unsigned int e, m, csd_struct; | |
95 | u32 *resp = card->raw_csd; | |
96 | ||
97 | csd_struct = UNSTUFF_BITS(resp, 126, 2); | |
98 | ||
99 | switch (csd_struct) { | |
100 | case 0: | |
101 | m = UNSTUFF_BITS(resp, 115, 4); | |
102 | e = UNSTUFF_BITS(resp, 112, 3); | |
103 | csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; | |
104 | csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; | |
105 | ||
106 | m = UNSTUFF_BITS(resp, 99, 4); | |
107 | e = UNSTUFF_BITS(resp, 96, 3); | |
108 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
109 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
110 | ||
111 | e = UNSTUFF_BITS(resp, 47, 3); | |
112 | m = UNSTUFF_BITS(resp, 62, 12); | |
113 | csd->capacity = (1 + m) << (e + 2); | |
114 | ||
115 | csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); | |
116 | csd->read_partial = UNSTUFF_BITS(resp, 79, 1); | |
117 | csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); | |
118 | csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); | |
119 | csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); | |
120 | csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); | |
121 | csd->write_partial = UNSTUFF_BITS(resp, 21, 1); | |
122 | break; | |
123 | case 1: | |
124 | /* | |
125 | * This is a block-addressed SDHC card. Most | |
126 | * interesting fields are unused and have fixed | |
127 | * values. To avoid getting tripped by buggy cards, | |
128 | * we assume those fixed values ourselves. | |
129 | */ | |
130 | mmc_card_set_blockaddr(card); | |
131 | ||
132 | csd->tacc_ns = 0; /* Unused */ | |
133 | csd->tacc_clks = 0; /* Unused */ | |
134 | ||
135 | m = UNSTUFF_BITS(resp, 99, 4); | |
136 | e = UNSTUFF_BITS(resp, 96, 3); | |
137 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
138 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
139 | ||
140 | m = UNSTUFF_BITS(resp, 48, 22); | |
141 | csd->capacity = (1 + m) << 10; | |
142 | ||
143 | csd->read_blkbits = 9; | |
144 | csd->read_partial = 0; | |
145 | csd->write_misalign = 0; | |
146 | csd->read_misalign = 0; | |
147 | csd->r2w_factor = 4; /* Unused */ | |
148 | csd->write_blkbits = 9; | |
149 | csd->write_partial = 0; | |
150 | break; | |
151 | default: | |
152 | printk("%s: unrecognised CSD structure version %d\n", | |
153 | mmc_hostname(card->host), csd_struct); | |
bd766312 | 154 | return -EINVAL; |
7ea239d9 | 155 | } |
bd766312 PO |
156 | |
157 | return 0; | |
7ea239d9 PO |
158 | } |
159 | ||
160 | /* | |
161 | * Given a 64-bit response, decode to our card SCR structure. | |
162 | */ | |
bd766312 | 163 | static int mmc_decode_scr(struct mmc_card *card) |
7ea239d9 PO |
164 | { |
165 | struct sd_scr *scr = &card->scr; | |
166 | unsigned int scr_struct; | |
167 | u32 resp[4]; | |
168 | ||
169 | BUG_ON(!mmc_card_sd(card)); | |
170 | ||
171 | resp[3] = card->raw_scr[1]; | |
172 | resp[2] = card->raw_scr[0]; | |
173 | ||
174 | scr_struct = UNSTUFF_BITS(resp, 60, 4); | |
175 | if (scr_struct != 0) { | |
176 | printk("%s: unrecognised SCR structure version %d\n", | |
177 | mmc_hostname(card->host), scr_struct); | |
bd766312 | 178 | return -EINVAL; |
7ea239d9 PO |
179 | } |
180 | ||
181 | scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); | |
182 | scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); | |
bd766312 PO |
183 | |
184 | return 0; | |
7ea239d9 PO |
185 | } |
186 | ||
187 | /* | |
1addfcdb | 188 | * Fetches and decodes switch information |
7ea239d9 | 189 | */ |
1addfcdb | 190 | static int mmc_read_switch(struct mmc_card *card) |
7ea239d9 PO |
191 | { |
192 | int err; | |
193 | u8 *status; | |
194 | ||
3373c0ae PO |
195 | if (card->scr.sda_vsn < SCR_SPEC_VER_1) |
196 | return MMC_ERR_NONE; | |
197 | ||
198 | if (!(card->csd.cmdclass & CCC_SWITCH)) { | |
199 | printk(KERN_WARNING "%s: card lacks mandatory switch " | |
200 | "function, performance might suffer.\n", | |
201 | mmc_hostname(card->host)); | |
202 | return MMC_ERR_NONE; | |
203 | } | |
204 | ||
7ea239d9 PO |
205 | err = MMC_ERR_FAILED; |
206 | ||
207 | status = kmalloc(64, GFP_KERNEL); | |
208 | if (!status) { | |
209 | printk("%s: could not allocate a buffer for switch " | |
210 | "capabilities.\n", | |
211 | mmc_hostname(card->host)); | |
212 | return err; | |
213 | } | |
214 | ||
215 | err = mmc_sd_switch(card, 0, 0, 1, status); | |
216 | if (err != MMC_ERR_NONE) { | |
3373c0ae PO |
217 | printk(KERN_WARNING "%s: problem reading switch " |
218 | "capabilities, performance might suffer.\n", | |
219 | mmc_hostname(card->host)); | |
1addfcdb | 220 | err = MMC_ERR_NONE; |
7ea239d9 PO |
221 | goto out; |
222 | } | |
223 | ||
224 | if (status[13] & 0x02) | |
225 | card->sw_caps.hs_max_dtr = 50000000; | |
226 | ||
1addfcdb PO |
227 | out: |
228 | kfree(status); | |
229 | ||
230 | return err; | |
231 | } | |
232 | ||
233 | /* | |
234 | * Test if the card supports high-speed mode and, if so, switch to it. | |
235 | */ | |
236 | static int mmc_switch_hs(struct mmc_card *card) | |
237 | { | |
238 | int err; | |
239 | u8 *status; | |
240 | ||
3373c0ae PO |
241 | if (card->scr.sda_vsn < SCR_SPEC_VER_1) |
242 | return MMC_ERR_NONE; | |
243 | ||
244 | if (!(card->csd.cmdclass & CCC_SWITCH)) | |
245 | return MMC_ERR_NONE; | |
246 | ||
1addfcdb PO |
247 | if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) |
248 | return MMC_ERR_NONE; | |
249 | ||
250 | if (card->sw_caps.hs_max_dtr == 0) | |
251 | return MMC_ERR_NONE; | |
252 | ||
253 | err = MMC_ERR_FAILED; | |
254 | ||
255 | status = kmalloc(64, GFP_KERNEL); | |
256 | if (!status) { | |
257 | printk("%s: could not allocate a buffer for switch " | |
258 | "capabilities.\n", | |
259 | mmc_hostname(card->host)); | |
260 | return err; | |
261 | } | |
262 | ||
7ea239d9 PO |
263 | err = mmc_sd_switch(card, 1, 0, 1, status); |
264 | if (err != MMC_ERR_NONE) | |
265 | goto out; | |
266 | ||
267 | if ((status[16] & 0xF) != 1) { | |
268 | printk(KERN_WARNING "%s: Problem switching card " | |
269 | "into high-speed mode!\n", | |
270 | mmc_hostname(card->host)); | |
271 | } else { | |
272 | mmc_card_set_highspeed(card); | |
273 | mmc_set_timing(card->host, MMC_TIMING_SD_HS); | |
274 | } | |
275 | ||
276 | out: | |
277 | kfree(status); | |
278 | ||
279 | return err; | |
280 | } | |
281 | ||
282 | /* | |
6abaa0c9 PO |
283 | * Handle the detection and initialisation of a card. |
284 | * | |
285 | * In the case of a resume, "curcard" will contain the card | |
286 | * we're trying to reinitialise. | |
7ea239d9 | 287 | */ |
6abaa0c9 PO |
288 | static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, |
289 | struct mmc_card *oldcard) | |
7ea239d9 PO |
290 | { |
291 | struct mmc_card *card; | |
292 | int err; | |
293 | u32 cid[4]; | |
294 | unsigned int max_dtr; | |
295 | ||
296 | BUG_ON(!host); | |
297 | BUG_ON(!host->claimed); | |
298 | ||
7ea239d9 PO |
299 | /* |
300 | * Since we're changing the OCR value, we seem to | |
301 | * need to tell some cards to go back to the idle | |
302 | * state. We wait 1ms to give cards time to | |
303 | * respond. | |
304 | */ | |
305 | mmc_go_idle(host); | |
306 | ||
307 | /* | |
308 | * If SD_SEND_IF_COND indicates an SD 2.0 | |
309 | * compliant card and we should set bit 30 | |
310 | * of the ocr to indicate that we can handle | |
311 | * block-addressed SDHC cards. | |
312 | */ | |
6abaa0c9 | 313 | err = mmc_send_if_cond(host, ocr); |
7ea239d9 | 314 | if (err == MMC_ERR_NONE) |
6abaa0c9 | 315 | ocr |= 1 << 30; |
7ea239d9 | 316 | |
6abaa0c9 PO |
317 | err = mmc_send_app_op_cond(host, ocr, NULL); |
318 | if (err != MMC_ERR_NONE) | |
319 | goto err; | |
7ea239d9 PO |
320 | |
321 | /* | |
322 | * Fetch CID from card. | |
323 | */ | |
324 | err = mmc_all_send_cid(host, cid); | |
325 | if (err != MMC_ERR_NONE) | |
326 | goto err; | |
327 | ||
6abaa0c9 PO |
328 | if (oldcard) { |
329 | if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) | |
330 | goto err; | |
7ea239d9 | 331 | |
6abaa0c9 PO |
332 | card = oldcard; |
333 | } else { | |
334 | /* | |
335 | * Allocate card structure. | |
336 | */ | |
337 | card = mmc_alloc_card(host); | |
338 | if (IS_ERR(card)) | |
339 | goto err; | |
340 | ||
341 | card->type = MMC_TYPE_SD; | |
342 | memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); | |
343 | } | |
7ea239d9 PO |
344 | |
345 | /* | |
346 | * Set card RCA. | |
347 | */ | |
348 | err = mmc_send_relative_addr(host, &card->rca); | |
349 | if (err != MMC_ERR_NONE) | |
350 | goto free_card; | |
351 | ||
352 | mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); | |
353 | ||
6abaa0c9 PO |
354 | if (!oldcard) { |
355 | /* | |
356 | * Fetch CSD from card. | |
357 | */ | |
358 | err = mmc_send_csd(card, card->raw_csd); | |
359 | if (err != MMC_ERR_NONE) | |
360 | goto free_card; | |
7ea239d9 | 361 | |
bd766312 PO |
362 | err = mmc_decode_csd(card); |
363 | if (err < 0) | |
364 | goto free_card; | |
365 | ||
6abaa0c9 PO |
366 | mmc_decode_cid(card); |
367 | } | |
7ea239d9 PO |
368 | |
369 | /* | |
6abaa0c9 | 370 | * Select card, as all following commands rely on that. |
7ea239d9 PO |
371 | */ |
372 | err = mmc_select_card(card); | |
373 | if (err != MMC_ERR_NONE) | |
374 | goto free_card; | |
375 | ||
6abaa0c9 PO |
376 | if (!oldcard) { |
377 | /* | |
378 | * Fetch SCR from card. | |
379 | */ | |
380 | err = mmc_app_send_scr(card, card->raw_scr); | |
381 | if (err != MMC_ERR_NONE) | |
382 | goto free_card; | |
7ea239d9 | 383 | |
bd766312 PO |
384 | err = mmc_decode_scr(card); |
385 | if (err < 0) | |
386 | goto free_card; | |
7ea239d9 | 387 | |
6abaa0c9 PO |
388 | /* |
389 | * Fetch switch information from card. | |
390 | */ | |
391 | err = mmc_read_switch(card); | |
392 | if (err != MMC_ERR_NONE) | |
393 | goto free_card; | |
394 | } | |
1addfcdb PO |
395 | |
396 | /* | |
397 | * Attempt to change to high-speed (if supported) | |
7ea239d9 PO |
398 | */ |
399 | err = mmc_switch_hs(card); | |
400 | if (err != MMC_ERR_NONE) | |
401 | goto free_card; | |
402 | ||
403 | /* | |
404 | * Compute bus speed. | |
405 | */ | |
406 | max_dtr = (unsigned int)-1; | |
407 | ||
408 | if (mmc_card_highspeed(card)) { | |
409 | if (max_dtr > card->sw_caps.hs_max_dtr) | |
410 | max_dtr = card->sw_caps.hs_max_dtr; | |
411 | } else if (max_dtr > card->csd.max_dtr) { | |
412 | max_dtr = card->csd.max_dtr; | |
413 | } | |
414 | ||
415 | mmc_set_clock(host, max_dtr); | |
416 | ||
417 | /* | |
418 | * Switch to wider bus (if supported). | |
419 | */ | |
71651297 | 420 | if ((host->caps & MMC_CAP_4_BIT_DATA) && |
7ea239d9 PO |
421 | (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { |
422 | err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); | |
423 | if (err != MMC_ERR_NONE) | |
424 | goto free_card; | |
425 | ||
426 | mmc_set_bus_width(host, MMC_BUS_WIDTH_4); | |
427 | } | |
428 | ||
c3bff2ec PO |
429 | /* |
430 | * Check if read-only switch is active. | |
431 | */ | |
432 | if (!oldcard) { | |
433 | if (!host->ops->get_ro) { | |
434 | printk(KERN_WARNING "%s: host does not " | |
435 | "support reading read-only " | |
436 | "switch. assuming write-enable.\n", | |
437 | mmc_hostname(host)); | |
438 | } else { | |
439 | if (host->ops->get_ro(host)) | |
440 | mmc_card_set_readonly(card); | |
441 | } | |
442 | } | |
443 | ||
6abaa0c9 PO |
444 | if (!oldcard) |
445 | host->card = card; | |
446 | ||
447 | return MMC_ERR_NONE; | |
448 | ||
449 | free_card: | |
450 | if (!oldcard) | |
451 | mmc_remove_card(card); | |
452 | err: | |
453 | ||
454 | return MMC_ERR_FAILED; | |
455 | } | |
456 | ||
457 | /* | |
458 | * Host is being removed. Free up the current card. | |
459 | */ | |
460 | static void mmc_sd_remove(struct mmc_host *host) | |
461 | { | |
462 | BUG_ON(!host); | |
463 | BUG_ON(!host->card); | |
464 | ||
465 | mmc_remove_card(host->card); | |
466 | host->card = NULL; | |
467 | } | |
468 | ||
469 | /* | |
470 | * Card detection callback from host. | |
471 | */ | |
472 | static void mmc_sd_detect(struct mmc_host *host) | |
473 | { | |
474 | int err; | |
475 | ||
476 | BUG_ON(!host); | |
477 | BUG_ON(!host->card); | |
478 | ||
479 | mmc_claim_host(host); | |
480 | ||
481 | /* | |
482 | * Just check if our card has been removed. | |
483 | */ | |
484 | err = mmc_send_status(host->card, NULL); | |
7ea239d9 PO |
485 | |
486 | mmc_release_host(host); | |
487 | ||
6abaa0c9 | 488 | if (err != MMC_ERR_NONE) { |
4101c16a | 489 | mmc_sd_remove(host); |
6abaa0c9 PO |
490 | |
491 | mmc_claim_host(host); | |
492 | mmc_detach_bus(host); | |
493 | mmc_release_host(host); | |
494 | } | |
495 | } | |
496 | ||
4101c16a PO |
497 | MMC_ATTR_FN(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], |
498 | card->raw_cid[2], card->raw_cid[3]); | |
499 | MMC_ATTR_FN(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], | |
500 | card->raw_csd[2], card->raw_csd[3]); | |
501 | MMC_ATTR_FN(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); | |
502 | MMC_ATTR_FN(date, "%02d/%04d\n", card->cid.month, card->cid.year); | |
503 | MMC_ATTR_FN(fwrev, "0x%x\n", card->cid.fwrev); | |
504 | MMC_ATTR_FN(hwrev, "0x%x\n", card->cid.hwrev); | |
505 | MMC_ATTR_FN(manfid, "0x%06x\n", card->cid.manfid); | |
506 | MMC_ATTR_FN(name, "%s\n", card->cid.prod_name); | |
507 | MMC_ATTR_FN(oemid, "0x%04x\n", card->cid.oemid); | |
508 | MMC_ATTR_FN(serial, "0x%08x\n", card->cid.serial); | |
509 | ||
510 | static struct device_attribute mmc_sd_dev_attrs[] = { | |
511 | MMC_ATTR_RO(cid), | |
512 | MMC_ATTR_RO(csd), | |
513 | MMC_ATTR_RO(scr), | |
514 | MMC_ATTR_RO(date), | |
515 | MMC_ATTR_RO(fwrev), | |
516 | MMC_ATTR_RO(hwrev), | |
517 | MMC_ATTR_RO(manfid), | |
518 | MMC_ATTR_RO(name), | |
519 | MMC_ATTR_RO(oemid), | |
520 | MMC_ATTR_RO(serial), | |
521 | __ATTR_NULL, | |
522 | }; | |
523 | ||
524 | /* | |
525 | * Adds sysfs entries as relevant. | |
526 | */ | |
527 | static int mmc_sd_sysfs_add(struct mmc_host *host, struct mmc_card *card) | |
528 | { | |
529 | int ret; | |
530 | ||
531 | ret = mmc_add_attrs(card, mmc_sd_dev_attrs); | |
532 | if (ret < 0) | |
533 | return ret; | |
534 | ||
535 | return 0; | |
536 | } | |
537 | ||
538 | /* | |
539 | * Removes the sysfs entries added by mmc_sysfs_add(). | |
540 | */ | |
541 | static void mmc_sd_sysfs_remove(struct mmc_host *host, struct mmc_card *card) | |
542 | { | |
543 | mmc_remove_attrs(card, mmc_sd_dev_attrs); | |
544 | } | |
545 | ||
6abaa0c9 PO |
546 | #ifdef CONFIG_MMC_UNSAFE_RESUME |
547 | ||
548 | /* | |
549 | * Suspend callback from host. | |
550 | */ | |
551 | static void mmc_sd_suspend(struct mmc_host *host) | |
552 | { | |
553 | BUG_ON(!host); | |
554 | BUG_ON(!host->card); | |
555 | ||
556 | mmc_claim_host(host); | |
557 | mmc_deselect_cards(host); | |
558 | host->card->state &= ~MMC_STATE_HIGHSPEED; | |
559 | mmc_release_host(host); | |
560 | } | |
561 | ||
562 | /* | |
563 | * Resume callback from host. | |
564 | * | |
565 | * This function tries to determine if the same card is still present | |
566 | * and, if so, restore all state to it. | |
567 | */ | |
568 | static void mmc_sd_resume(struct mmc_host *host) | |
569 | { | |
570 | int err; | |
571 | ||
572 | BUG_ON(!host); | |
573 | BUG_ON(!host->card); | |
574 | ||
575 | mmc_claim_host(host); | |
576 | ||
577 | err = mmc_sd_init_card(host, host->ocr, host->card); | |
578 | if (err != MMC_ERR_NONE) { | |
4101c16a | 579 | mmc_sd_remove(host); |
6abaa0c9 PO |
580 | mmc_detach_bus(host); |
581 | } | |
582 | ||
583 | mmc_release_host(host); | |
584 | } | |
585 | ||
586 | #else | |
587 | ||
588 | #define mmc_sd_suspend NULL | |
589 | #define mmc_sd_resume NULL | |
590 | ||
591 | #endif | |
592 | ||
593 | static const struct mmc_bus_ops mmc_sd_ops = { | |
594 | .remove = mmc_sd_remove, | |
595 | .detect = mmc_sd_detect, | |
4101c16a PO |
596 | .sysfs_add = mmc_sd_sysfs_add, |
597 | .sysfs_remove = mmc_sd_sysfs_remove, | |
6abaa0c9 PO |
598 | .suspend = mmc_sd_suspend, |
599 | .resume = mmc_sd_resume, | |
600 | }; | |
601 | ||
602 | /* | |
603 | * Starting point for SD card init. | |
604 | */ | |
605 | int mmc_attach_sd(struct mmc_host *host, u32 ocr) | |
606 | { | |
607 | int err; | |
608 | ||
609 | BUG_ON(!host); | |
610 | BUG_ON(!host->claimed); | |
611 | ||
612 | mmc_attach_bus(host, &mmc_sd_ops); | |
613 | ||
614 | /* | |
615 | * Sanity check the voltages that the card claims to | |
616 | * support. | |
617 | */ | |
618 | if (ocr & 0x7F) { | |
619 | printk(KERN_WARNING "%s: card claims to support voltages " | |
620 | "below the defined range. These will be ignored.\n", | |
621 | mmc_hostname(host)); | |
622 | ocr &= ~0x7F; | |
623 | } | |
624 | ||
625 | if (ocr & MMC_VDD_165_195) { | |
626 | printk(KERN_WARNING "%s: SD card claims to support the " | |
627 | "incompletely defined 'low voltage range'. This " | |
628 | "will be ignored.\n", mmc_hostname(host)); | |
629 | ocr &= ~MMC_VDD_165_195; | |
630 | } | |
631 | ||
632 | host->ocr = mmc_select_voltage(host, ocr); | |
633 | ||
634 | /* | |
635 | * Can we support the voltage(s) of the card(s)? | |
636 | */ | |
637 | if (!host->ocr) | |
638 | goto err; | |
639 | ||
640 | /* | |
641 | * Detect and init the card. | |
642 | */ | |
643 | err = mmc_sd_init_card(host, host->ocr, NULL); | |
644 | if (err != MMC_ERR_NONE) | |
645 | goto err; | |
646 | ||
647 | mmc_release_host(host); | |
648 | ||
4101c16a | 649 | err = mmc_add_card(host->card); |
7ea239d9 PO |
650 | if (err) |
651 | goto reclaim_host; | |
652 | ||
653 | return 0; | |
654 | ||
655 | reclaim_host: | |
656 | mmc_claim_host(host); | |
6abaa0c9 | 657 | mmc_remove_card(host->card); |
7ea239d9 PO |
658 | host->card = NULL; |
659 | err: | |
660 | mmc_detach_bus(host); | |
661 | mmc_release_host(host); | |
662 | ||
663 | return 0; | |
664 | } | |
665 |