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Commit | Line | Data |
---|---|---|
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" | |
4101c16a | 21 | #include "bus.h" |
7ea239d9 PO |
22 | #include "mmc_ops.h" |
23 | #include "sd_ops.h" | |
24 | ||
7ea239d9 PO |
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 void mmc_decode_cid(struct mmc_card *card) | |
62 | { | |
63 | u32 *resp = card->raw_cid; | |
64 | ||
65 | memset(&card->cid, 0, sizeof(struct mmc_cid)); | |
66 | ||
67 | /* | |
68 | * SD doesn't currently have a version field so we will | |
69 | * have to assume we can parse this. | |
70 | */ | |
71 | card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); | |
72 | card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); | |
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.hwrev = UNSTUFF_BITS(resp, 60, 4); | |
79 | card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); | |
80 | card->cid.serial = UNSTUFF_BITS(resp, 24, 32); | |
81 | card->cid.year = UNSTUFF_BITS(resp, 12, 8); | |
82 | card->cid.month = UNSTUFF_BITS(resp, 8, 4); | |
83 | ||
84 | card->cid.year += 2000; /* SD cards year offset */ | |
85 | } | |
86 | ||
87 | /* | |
88 | * Given a 128-bit response, decode to our card CSD structure. | |
89 | */ | |
bd766312 | 90 | static int mmc_decode_csd(struct mmc_card *card) |
7ea239d9 PO |
91 | { |
92 | struct mmc_csd *csd = &card->csd; | |
93 | unsigned int e, m, csd_struct; | |
94 | u32 *resp = card->raw_csd; | |
95 | ||
96 | csd_struct = UNSTUFF_BITS(resp, 126, 2); | |
97 | ||
98 | switch (csd_struct) { | |
99 | case 0: | |
100 | m = UNSTUFF_BITS(resp, 115, 4); | |
101 | e = UNSTUFF_BITS(resp, 112, 3); | |
102 | csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; | |
103 | csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; | |
104 | ||
105 | m = UNSTUFF_BITS(resp, 99, 4); | |
106 | e = UNSTUFF_BITS(resp, 96, 3); | |
107 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
108 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
109 | ||
110 | e = UNSTUFF_BITS(resp, 47, 3); | |
111 | m = UNSTUFF_BITS(resp, 62, 12); | |
112 | csd->capacity = (1 + m) << (e + 2); | |
113 | ||
114 | csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); | |
115 | csd->read_partial = UNSTUFF_BITS(resp, 79, 1); | |
116 | csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); | |
117 | csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); | |
118 | csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); | |
119 | csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); | |
120 | csd->write_partial = UNSTUFF_BITS(resp, 21, 1); | |
121 | break; | |
122 | case 1: | |
123 | /* | |
124 | * This is a block-addressed SDHC card. Most | |
125 | * interesting fields are unused and have fixed | |
126 | * values. To avoid getting tripped by buggy cards, | |
127 | * we assume those fixed values ourselves. | |
128 | */ | |
129 | mmc_card_set_blockaddr(card); | |
130 | ||
131 | csd->tacc_ns = 0; /* Unused */ | |
132 | csd->tacc_clks = 0; /* Unused */ | |
133 | ||
134 | m = UNSTUFF_BITS(resp, 99, 4); | |
135 | e = UNSTUFF_BITS(resp, 96, 3); | |
136 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
137 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
138 | ||
139 | m = UNSTUFF_BITS(resp, 48, 22); | |
140 | csd->capacity = (1 + m) << 10; | |
141 | ||
142 | csd->read_blkbits = 9; | |
143 | csd->read_partial = 0; | |
144 | csd->write_misalign = 0; | |
145 | csd->read_misalign = 0; | |
146 | csd->r2w_factor = 4; /* Unused */ | |
147 | csd->write_blkbits = 9; | |
148 | csd->write_partial = 0; | |
149 | break; | |
150 | default: | |
facba917 | 151 | printk(KERN_ERR "%s: unrecognised CSD structure version %d\n", |
7ea239d9 | 152 | mmc_hostname(card->host), csd_struct); |
bd766312 | 153 | return -EINVAL; |
7ea239d9 | 154 | } |
bd766312 PO |
155 | |
156 | return 0; | |
7ea239d9 PO |
157 | } |
158 | ||
159 | /* | |
160 | * Given a 64-bit response, decode to our card SCR structure. | |
161 | */ | |
bd766312 | 162 | static int mmc_decode_scr(struct mmc_card *card) |
7ea239d9 PO |
163 | { |
164 | struct sd_scr *scr = &card->scr; | |
165 | unsigned int scr_struct; | |
166 | u32 resp[4]; | |
167 | ||
7ea239d9 PO |
168 | resp[3] = card->raw_scr[1]; |
169 | resp[2] = card->raw_scr[0]; | |
170 | ||
171 | scr_struct = UNSTUFF_BITS(resp, 60, 4); | |
172 | if (scr_struct != 0) { | |
facba917 | 173 | printk(KERN_ERR "%s: unrecognised SCR structure version %d\n", |
7ea239d9 | 174 | mmc_hostname(card->host), scr_struct); |
bd766312 | 175 | return -EINVAL; |
7ea239d9 PO |
176 | } |
177 | ||
178 | scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); | |
179 | scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); | |
bd766312 PO |
180 | |
181 | return 0; | |
7ea239d9 PO |
182 | } |
183 | ||
184 | /* | |
1addfcdb | 185 | * Fetches and decodes switch information |
7ea239d9 | 186 | */ |
1addfcdb | 187 | static int mmc_read_switch(struct mmc_card *card) |
7ea239d9 PO |
188 | { |
189 | int err; | |
190 | u8 *status; | |
191 | ||
3373c0ae | 192 | if (card->scr.sda_vsn < SCR_SPEC_VER_1) |
17b0429d | 193 | return 0; |
3373c0ae PO |
194 | |
195 | if (!(card->csd.cmdclass & CCC_SWITCH)) { | |
196 | printk(KERN_WARNING "%s: card lacks mandatory switch " | |
197 | "function, performance might suffer.\n", | |
198 | mmc_hostname(card->host)); | |
17b0429d | 199 | return 0; |
3373c0ae PO |
200 | } |
201 | ||
17b0429d | 202 | err = -EIO; |
7ea239d9 PO |
203 | |
204 | status = kmalloc(64, GFP_KERNEL); | |
205 | if (!status) { | |
facba917 PO |
206 | printk(KERN_ERR "%s: could not allocate a buffer for " |
207 | "switch capabilities.\n", mmc_hostname(card->host)); | |
17b0429d | 208 | return -ENOMEM; |
7ea239d9 PO |
209 | } |
210 | ||
211 | err = mmc_sd_switch(card, 0, 0, 1, status); | |
17b0429d | 212 | if (err) { |
adf66a0d PO |
213 | /* |
214 | * We all hosts that cannot perform the command | |
215 | * to fail more gracefully | |
216 | */ | |
217 | if (err != -EINVAL) | |
218 | goto out; | |
219 | ||
3373c0ae PO |
220 | printk(KERN_WARNING "%s: problem reading switch " |
221 | "capabilities, performance might suffer.\n", | |
222 | mmc_hostname(card->host)); | |
17b0429d | 223 | err = 0; |
adf66a0d | 224 | |
7ea239d9 PO |
225 | goto out; |
226 | } | |
227 | ||
228 | if (status[13] & 0x02) | |
229 | card->sw_caps.hs_max_dtr = 50000000; | |
230 | ||
1addfcdb PO |
231 | out: |
232 | kfree(status); | |
233 | ||
234 | return err; | |
235 | } | |
236 | ||
237 | /* | |
238 | * Test if the card supports high-speed mode and, if so, switch to it. | |
239 | */ | |
240 | static int mmc_switch_hs(struct mmc_card *card) | |
241 | { | |
242 | int err; | |
243 | u8 *status; | |
244 | ||
3373c0ae | 245 | if (card->scr.sda_vsn < SCR_SPEC_VER_1) |
17b0429d | 246 | return 0; |
3373c0ae PO |
247 | |
248 | if (!(card->csd.cmdclass & CCC_SWITCH)) | |
17b0429d | 249 | return 0; |
3373c0ae | 250 | |
1addfcdb | 251 | if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) |
17b0429d | 252 | return 0; |
1addfcdb PO |
253 | |
254 | if (card->sw_caps.hs_max_dtr == 0) | |
17b0429d | 255 | return 0; |
1addfcdb | 256 | |
17b0429d | 257 | err = -EIO; |
1addfcdb PO |
258 | |
259 | status = kmalloc(64, GFP_KERNEL); | |
260 | if (!status) { | |
facba917 PO |
261 | printk(KERN_ERR "%s: could not allocate a buffer for " |
262 | "switch capabilities.\n", mmc_hostname(card->host)); | |
17b0429d | 263 | return -ENOMEM; |
1addfcdb PO |
264 | } |
265 | ||
7ea239d9 | 266 | err = mmc_sd_switch(card, 1, 0, 1, status); |
17b0429d | 267 | if (err) |
7ea239d9 PO |
268 | goto out; |
269 | ||
270 | if ((status[16] & 0xF) != 1) { | |
271 | printk(KERN_WARNING "%s: Problem switching card " | |
272 | "into high-speed mode!\n", | |
273 | mmc_hostname(card->host)); | |
274 | } else { | |
275 | mmc_card_set_highspeed(card); | |
276 | mmc_set_timing(card->host, MMC_TIMING_SD_HS); | |
277 | } | |
278 | ||
279 | out: | |
280 | kfree(status); | |
281 | ||
282 | return err; | |
283 | } | |
284 | ||
51ec92e2 PO |
285 | MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], |
286 | card->raw_cid[2], card->raw_cid[3]); | |
287 | MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], | |
288 | card->raw_csd[2], card->raw_csd[3]); | |
289 | MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); | |
290 | MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); | |
291 | MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); | |
292 | MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); | |
293 | MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); | |
294 | MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); | |
295 | MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); | |
296 | MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); | |
297 | ||
298 | ||
299 | static struct attribute *sd_std_attrs[] = { | |
300 | &dev_attr_cid.attr, | |
301 | &dev_attr_csd.attr, | |
302 | &dev_attr_scr.attr, | |
303 | &dev_attr_date.attr, | |
304 | &dev_attr_fwrev.attr, | |
305 | &dev_attr_hwrev.attr, | |
306 | &dev_attr_manfid.attr, | |
307 | &dev_attr_name.attr, | |
308 | &dev_attr_oemid.attr, | |
309 | &dev_attr_serial.attr, | |
310 | NULL, | |
311 | }; | |
312 | ||
313 | static struct attribute_group sd_std_attr_group = { | |
314 | .attrs = sd_std_attrs, | |
315 | }; | |
316 | ||
317 | static struct attribute_group *sd_attr_groups[] = { | |
318 | &sd_std_attr_group, | |
319 | NULL, | |
320 | }; | |
321 | ||
322 | static struct device_type sd_type = { | |
323 | .groups = sd_attr_groups, | |
324 | }; | |
325 | ||
7ea239d9 | 326 | /* |
6abaa0c9 PO |
327 | * Handle the detection and initialisation of a card. |
328 | * | |
329 | * In the case of a resume, "curcard" will contain the card | |
330 | * we're trying to reinitialise. | |
7ea239d9 | 331 | */ |
6abaa0c9 PO |
332 | static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, |
333 | struct mmc_card *oldcard) | |
7ea239d9 PO |
334 | { |
335 | struct mmc_card *card; | |
336 | int err; | |
337 | u32 cid[4]; | |
338 | unsigned int max_dtr; | |
339 | ||
340 | BUG_ON(!host); | |
d84075c8 | 341 | WARN_ON(!host->claimed); |
7ea239d9 | 342 | |
7ea239d9 PO |
343 | /* |
344 | * Since we're changing the OCR value, we seem to | |
345 | * need to tell some cards to go back to the idle | |
346 | * state. We wait 1ms to give cards time to | |
347 | * respond. | |
348 | */ | |
349 | mmc_go_idle(host); | |
350 | ||
351 | /* | |
352 | * If SD_SEND_IF_COND indicates an SD 2.0 | |
353 | * compliant card and we should set bit 30 | |
354 | * of the ocr to indicate that we can handle | |
355 | * block-addressed SDHC cards. | |
356 | */ | |
6abaa0c9 | 357 | err = mmc_send_if_cond(host, ocr); |
17b0429d | 358 | if (!err) |
6abaa0c9 | 359 | ocr |= 1 << 30; |
7ea239d9 | 360 | |
6abaa0c9 | 361 | err = mmc_send_app_op_cond(host, ocr, NULL); |
17b0429d | 362 | if (err) |
6abaa0c9 | 363 | goto err; |
7ea239d9 | 364 | |
af517150 DB |
365 | /* |
366 | * For SPI, enable CRC as appropriate. | |
367 | */ | |
368 | if (mmc_host_is_spi(host)) { | |
369 | err = mmc_spi_set_crc(host, use_spi_crc); | |
370 | if (err) | |
371 | goto err; | |
372 | } | |
373 | ||
7ea239d9 PO |
374 | /* |
375 | * Fetch CID from card. | |
376 | */ | |
af517150 DB |
377 | if (mmc_host_is_spi(host)) |
378 | err = mmc_send_cid(host, cid); | |
379 | else | |
380 | err = mmc_all_send_cid(host, cid); | |
17b0429d | 381 | if (err) |
7ea239d9 PO |
382 | goto err; |
383 | ||
6abaa0c9 | 384 | if (oldcard) { |
adf66a0d PO |
385 | if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) { |
386 | err = -ENOENT; | |
6abaa0c9 | 387 | goto err; |
adf66a0d | 388 | } |
7ea239d9 | 389 | |
6abaa0c9 PO |
390 | card = oldcard; |
391 | } else { | |
392 | /* | |
393 | * Allocate card structure. | |
394 | */ | |
51ec92e2 | 395 | card = mmc_alloc_card(host, &sd_type); |
adf66a0d PO |
396 | if (IS_ERR(card)) { |
397 | err = PTR_ERR(card); | |
6abaa0c9 | 398 | goto err; |
adf66a0d | 399 | } |
6abaa0c9 PO |
400 | |
401 | card->type = MMC_TYPE_SD; | |
402 | memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); | |
403 | } | |
7ea239d9 PO |
404 | |
405 | /* | |
af517150 | 406 | * For native busses: get card RCA and quit open drain mode. |
7ea239d9 | 407 | */ |
af517150 DB |
408 | if (!mmc_host_is_spi(host)) { |
409 | err = mmc_send_relative_addr(host, &card->rca); | |
410 | if (err) | |
411 | goto free_card; | |
7ea239d9 | 412 | |
af517150 DB |
413 | mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); |
414 | } | |
7ea239d9 | 415 | |
6abaa0c9 PO |
416 | if (!oldcard) { |
417 | /* | |
418 | * Fetch CSD from card. | |
419 | */ | |
420 | err = mmc_send_csd(card, card->raw_csd); | |
17b0429d | 421 | if (err) |
6abaa0c9 | 422 | goto free_card; |
7ea239d9 | 423 | |
bd766312 | 424 | err = mmc_decode_csd(card); |
adf66a0d | 425 | if (err) |
bd766312 PO |
426 | goto free_card; |
427 | ||
6abaa0c9 PO |
428 | mmc_decode_cid(card); |
429 | } | |
7ea239d9 PO |
430 | |
431 | /* | |
6abaa0c9 | 432 | * Select card, as all following commands rely on that. |
7ea239d9 | 433 | */ |
af517150 DB |
434 | if (!mmc_host_is_spi(host)) { |
435 | err = mmc_select_card(card); | |
436 | if (err) | |
437 | goto free_card; | |
438 | } | |
7ea239d9 | 439 | |
6abaa0c9 PO |
440 | if (!oldcard) { |
441 | /* | |
442 | * Fetch SCR from card. | |
443 | */ | |
444 | err = mmc_app_send_scr(card, card->raw_scr); | |
17b0429d | 445 | if (err) |
6abaa0c9 | 446 | goto free_card; |
7ea239d9 | 447 | |
bd766312 PO |
448 | err = mmc_decode_scr(card); |
449 | if (err < 0) | |
450 | goto free_card; | |
7ea239d9 | 451 | |
6abaa0c9 PO |
452 | /* |
453 | * Fetch switch information from card. | |
454 | */ | |
455 | err = mmc_read_switch(card); | |
17b0429d | 456 | if (err) |
6abaa0c9 PO |
457 | goto free_card; |
458 | } | |
1addfcdb PO |
459 | |
460 | /* | |
461 | * Attempt to change to high-speed (if supported) | |
7ea239d9 PO |
462 | */ |
463 | err = mmc_switch_hs(card); | |
17b0429d | 464 | if (err) |
7ea239d9 PO |
465 | goto free_card; |
466 | ||
467 | /* | |
468 | * Compute bus speed. | |
469 | */ | |
470 | max_dtr = (unsigned int)-1; | |
471 | ||
472 | if (mmc_card_highspeed(card)) { | |
473 | if (max_dtr > card->sw_caps.hs_max_dtr) | |
474 | max_dtr = card->sw_caps.hs_max_dtr; | |
475 | } else if (max_dtr > card->csd.max_dtr) { | |
476 | max_dtr = card->csd.max_dtr; | |
477 | } | |
478 | ||
479 | mmc_set_clock(host, max_dtr); | |
480 | ||
481 | /* | |
482 | * Switch to wider bus (if supported). | |
483 | */ | |
71651297 | 484 | if ((host->caps & MMC_CAP_4_BIT_DATA) && |
7ea239d9 PO |
485 | (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { |
486 | err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); | |
17b0429d | 487 | if (err) |
7ea239d9 PO |
488 | goto free_card; |
489 | ||
490 | mmc_set_bus_width(host, MMC_BUS_WIDTH_4); | |
491 | } | |
492 | ||
c3bff2ec PO |
493 | /* |
494 | * Check if read-only switch is active. | |
495 | */ | |
496 | if (!oldcard) { | |
497 | if (!host->ops->get_ro) { | |
498 | printk(KERN_WARNING "%s: host does not " | |
499 | "support reading read-only " | |
500 | "switch. assuming write-enable.\n", | |
501 | mmc_hostname(host)); | |
502 | } else { | |
503 | if (host->ops->get_ro(host)) | |
504 | mmc_card_set_readonly(card); | |
505 | } | |
506 | } | |
507 | ||
6abaa0c9 PO |
508 | if (!oldcard) |
509 | host->card = card; | |
510 | ||
17b0429d | 511 | return 0; |
6abaa0c9 PO |
512 | |
513 | free_card: | |
514 | if (!oldcard) | |
515 | mmc_remove_card(card); | |
516 | err: | |
517 | ||
adf66a0d | 518 | return err; |
6abaa0c9 PO |
519 | } |
520 | ||
521 | /* | |
522 | * Host is being removed. Free up the current card. | |
523 | */ | |
524 | static void mmc_sd_remove(struct mmc_host *host) | |
525 | { | |
526 | BUG_ON(!host); | |
527 | BUG_ON(!host->card); | |
528 | ||
529 | mmc_remove_card(host->card); | |
530 | host->card = NULL; | |
531 | } | |
532 | ||
533 | /* | |
534 | * Card detection callback from host. | |
535 | */ | |
536 | static void mmc_sd_detect(struct mmc_host *host) | |
537 | { | |
538 | int err; | |
539 | ||
540 | BUG_ON(!host); | |
541 | BUG_ON(!host->card); | |
542 | ||
543 | mmc_claim_host(host); | |
544 | ||
545 | /* | |
546 | * Just check if our card has been removed. | |
547 | */ | |
548 | err = mmc_send_status(host->card, NULL); | |
7ea239d9 PO |
549 | |
550 | mmc_release_host(host); | |
551 | ||
17b0429d | 552 | if (err) { |
4101c16a | 553 | mmc_sd_remove(host); |
6abaa0c9 PO |
554 | |
555 | mmc_claim_host(host); | |
556 | mmc_detach_bus(host); | |
557 | mmc_release_host(host); | |
558 | } | |
559 | } | |
560 | ||
561 | #ifdef CONFIG_MMC_UNSAFE_RESUME | |
562 | ||
563 | /* | |
564 | * Suspend callback from host. | |
565 | */ | |
566 | static void mmc_sd_suspend(struct mmc_host *host) | |
567 | { | |
568 | BUG_ON(!host); | |
569 | BUG_ON(!host->card); | |
570 | ||
571 | mmc_claim_host(host); | |
af517150 DB |
572 | if (!mmc_host_is_spi(host)) |
573 | mmc_deselect_cards(host); | |
6abaa0c9 PO |
574 | host->card->state &= ~MMC_STATE_HIGHSPEED; |
575 | mmc_release_host(host); | |
576 | } | |
577 | ||
578 | /* | |
579 | * Resume callback from host. | |
580 | * | |
581 | * This function tries to determine if the same card is still present | |
582 | * and, if so, restore all state to it. | |
583 | */ | |
584 | static void mmc_sd_resume(struct mmc_host *host) | |
585 | { | |
586 | int err; | |
587 | ||
588 | BUG_ON(!host); | |
589 | BUG_ON(!host->card); | |
590 | ||
591 | mmc_claim_host(host); | |
6abaa0c9 | 592 | err = mmc_sd_init_card(host, host->ocr, host->card); |
2986d0bf PO |
593 | mmc_release_host(host); |
594 | ||
17b0429d | 595 | if (err) { |
4101c16a | 596 | mmc_sd_remove(host); |
2986d0bf PO |
597 | |
598 | mmc_claim_host(host); | |
6abaa0c9 | 599 | mmc_detach_bus(host); |
2986d0bf | 600 | mmc_release_host(host); |
6abaa0c9 PO |
601 | } |
602 | ||
6abaa0c9 PO |
603 | } |
604 | ||
605 | #else | |
606 | ||
607 | #define mmc_sd_suspend NULL | |
608 | #define mmc_sd_resume NULL | |
609 | ||
610 | #endif | |
611 | ||
612 | static const struct mmc_bus_ops mmc_sd_ops = { | |
613 | .remove = mmc_sd_remove, | |
614 | .detect = mmc_sd_detect, | |
615 | .suspend = mmc_sd_suspend, | |
616 | .resume = mmc_sd_resume, | |
617 | }; | |
618 | ||
619 | /* | |
620 | * Starting point for SD card init. | |
621 | */ | |
622 | int mmc_attach_sd(struct mmc_host *host, u32 ocr) | |
623 | { | |
624 | int err; | |
625 | ||
626 | BUG_ON(!host); | |
d84075c8 | 627 | WARN_ON(!host->claimed); |
6abaa0c9 PO |
628 | |
629 | mmc_attach_bus(host, &mmc_sd_ops); | |
630 | ||
af517150 DB |
631 | /* |
632 | * We need to get OCR a different way for SPI. | |
633 | */ | |
634 | if (mmc_host_is_spi(host)) { | |
635 | mmc_go_idle(host); | |
636 | ||
637 | err = mmc_spi_read_ocr(host, 0, &ocr); | |
638 | if (err) | |
639 | goto err; | |
640 | } | |
641 | ||
6abaa0c9 PO |
642 | /* |
643 | * Sanity check the voltages that the card claims to | |
644 | * support. | |
645 | */ | |
646 | if (ocr & 0x7F) { | |
647 | printk(KERN_WARNING "%s: card claims to support voltages " | |
648 | "below the defined range. These will be ignored.\n", | |
649 | mmc_hostname(host)); | |
650 | ocr &= ~0x7F; | |
651 | } | |
652 | ||
653 | if (ocr & MMC_VDD_165_195) { | |
654 | printk(KERN_WARNING "%s: SD card claims to support the " | |
655 | "incompletely defined 'low voltage range'. This " | |
656 | "will be ignored.\n", mmc_hostname(host)); | |
657 | ocr &= ~MMC_VDD_165_195; | |
658 | } | |
659 | ||
660 | host->ocr = mmc_select_voltage(host, ocr); | |
661 | ||
662 | /* | |
663 | * Can we support the voltage(s) of the card(s)? | |
664 | */ | |
109b5bed PO |
665 | if (!host->ocr) { |
666 | err = -EINVAL; | |
6abaa0c9 | 667 | goto err; |
109b5bed | 668 | } |
6abaa0c9 PO |
669 | |
670 | /* | |
671 | * Detect and init the card. | |
672 | */ | |
673 | err = mmc_sd_init_card(host, host->ocr, NULL); | |
17b0429d | 674 | if (err) |
6abaa0c9 PO |
675 | goto err; |
676 | ||
677 | mmc_release_host(host); | |
678 | ||
4101c16a | 679 | err = mmc_add_card(host->card); |
7ea239d9 | 680 | if (err) |
2986d0bf | 681 | goto remove_card; |
7ea239d9 PO |
682 | |
683 | return 0; | |
684 | ||
2986d0bf | 685 | remove_card: |
6abaa0c9 | 686 | mmc_remove_card(host->card); |
7ea239d9 | 687 | host->card = NULL; |
2986d0bf | 688 | mmc_claim_host(host); |
7ea239d9 PO |
689 | err: |
690 | mmc_detach_bus(host); | |
691 | mmc_release_host(host); | |
692 | ||
109b5bed PO |
693 | printk(KERN_ERR "%s: error %d whilst initialising SD card\n", |
694 | mmc_hostname(host), err); | |
695 | ||
adf66a0d | 696 | return err; |
7ea239d9 PO |
697 | } |
698 |