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> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
7ea239d9 PO |
15 | |
16 | #include <linux/mmc/host.h> | |
17 | #include <linux/mmc/card.h> | |
18 | #include <linux/mmc/mmc.h> | |
3373c0ae | 19 | #include <linux/mmc/sd.h> |
7ea239d9 PO |
20 | |
21 | #include "core.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 | */ | |
71578a1e | 62 | void mmc_decode_cid(struct mmc_card *card) |
7ea239d9 PO |
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); | |
dfe86cba AH |
122 | |
123 | if (UNSTUFF_BITS(resp, 46, 1)) { | |
124 | csd->erase_size = 1; | |
125 | } else if (csd->write_blkbits >= 9) { | |
126 | csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1; | |
127 | csd->erase_size <<= csd->write_blkbits - 9; | |
128 | } | |
7ea239d9 PO |
129 | break; |
130 | case 1: | |
131 | /* | |
132 | * This is a block-addressed SDHC card. Most | |
133 | * interesting fields are unused and have fixed | |
134 | * values. To avoid getting tripped by buggy cards, | |
135 | * we assume those fixed values ourselves. | |
136 | */ | |
137 | mmc_card_set_blockaddr(card); | |
138 | ||
139 | csd->tacc_ns = 0; /* Unused */ | |
140 | csd->tacc_clks = 0; /* Unused */ | |
141 | ||
142 | m = UNSTUFF_BITS(resp, 99, 4); | |
143 | e = UNSTUFF_BITS(resp, 96, 3); | |
144 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
145 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
146 | ||
147 | m = UNSTUFF_BITS(resp, 48, 22); | |
148 | csd->capacity = (1 + m) << 10; | |
149 | ||
150 | csd->read_blkbits = 9; | |
151 | csd->read_partial = 0; | |
152 | csd->write_misalign = 0; | |
153 | csd->read_misalign = 0; | |
154 | csd->r2w_factor = 4; /* Unused */ | |
155 | csd->write_blkbits = 9; | |
156 | csd->write_partial = 0; | |
dfe86cba | 157 | csd->erase_size = 1; |
7ea239d9 PO |
158 | break; |
159 | default: | |
facba917 | 160 | printk(KERN_ERR "%s: unrecognised CSD structure version %d\n", |
7ea239d9 | 161 | mmc_hostname(card->host), csd_struct); |
bd766312 | 162 | return -EINVAL; |
7ea239d9 | 163 | } |
bd766312 | 164 | |
dfe86cba AH |
165 | card->erase_size = csd->erase_size; |
166 | ||
bd766312 | 167 | return 0; |
7ea239d9 PO |
168 | } |
169 | ||
170 | /* | |
171 | * Given a 64-bit response, decode to our card SCR structure. | |
172 | */ | |
bd766312 | 173 | static int mmc_decode_scr(struct mmc_card *card) |
7ea239d9 PO |
174 | { |
175 | struct sd_scr *scr = &card->scr; | |
176 | unsigned int scr_struct; | |
177 | u32 resp[4]; | |
178 | ||
7ea239d9 PO |
179 | resp[3] = card->raw_scr[1]; |
180 | resp[2] = card->raw_scr[0]; | |
181 | ||
182 | scr_struct = UNSTUFF_BITS(resp, 60, 4); | |
183 | if (scr_struct != 0) { | |
facba917 | 184 | printk(KERN_ERR "%s: unrecognised SCR structure version %d\n", |
7ea239d9 | 185 | mmc_hostname(card->host), scr_struct); |
bd766312 | 186 | return -EINVAL; |
7ea239d9 PO |
187 | } |
188 | ||
189 | scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); | |
190 | scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); | |
bd766312 | 191 | |
dfe86cba AH |
192 | if (UNSTUFF_BITS(resp, 55, 1)) |
193 | card->erased_byte = 0xFF; | |
194 | else | |
195 | card->erased_byte = 0x0; | |
196 | ||
bd766312 | 197 | return 0; |
7ea239d9 PO |
198 | } |
199 | ||
dfe86cba AH |
200 | /* |
201 | * Fetch and process SD Status register. | |
202 | */ | |
203 | static int mmc_read_ssr(struct mmc_card *card) | |
204 | { | |
205 | unsigned int au, es, et, eo; | |
206 | int err, i; | |
207 | u32 *ssr; | |
208 | ||
209 | if (!(card->csd.cmdclass & CCC_APP_SPEC)) { | |
210 | printk(KERN_WARNING "%s: card lacks mandatory SD Status " | |
211 | "function.\n", mmc_hostname(card->host)); | |
212 | return 0; | |
213 | } | |
214 | ||
215 | ssr = kmalloc(64, GFP_KERNEL); | |
216 | if (!ssr) | |
217 | return -ENOMEM; | |
218 | ||
219 | err = mmc_app_sd_status(card, ssr); | |
220 | if (err) { | |
221 | printk(KERN_WARNING "%s: problem reading SD Status " | |
222 | "register.\n", mmc_hostname(card->host)); | |
223 | err = 0; | |
224 | goto out; | |
225 | } | |
226 | ||
227 | for (i = 0; i < 16; i++) | |
228 | ssr[i] = be32_to_cpu(ssr[i]); | |
229 | ||
230 | /* | |
231 | * UNSTUFF_BITS only works with four u32s so we have to offset the | |
232 | * bitfield positions accordingly. | |
233 | */ | |
234 | au = UNSTUFF_BITS(ssr, 428 - 384, 4); | |
235 | if (au > 0 || au <= 9) { | |
236 | card->ssr.au = 1 << (au + 4); | |
237 | es = UNSTUFF_BITS(ssr, 408 - 384, 16); | |
238 | et = UNSTUFF_BITS(ssr, 402 - 384, 6); | |
239 | eo = UNSTUFF_BITS(ssr, 400 - 384, 2); | |
240 | if (es && et) { | |
241 | card->ssr.erase_timeout = (et * 1000) / es; | |
242 | card->ssr.erase_offset = eo * 1000; | |
243 | } | |
244 | } else { | |
245 | printk(KERN_WARNING "%s: SD Status: Invalid Allocation Unit " | |
246 | "size.\n", mmc_hostname(card->host)); | |
247 | } | |
248 | out: | |
249 | kfree(ssr); | |
250 | return err; | |
251 | } | |
252 | ||
7ea239d9 | 253 | /* |
1addfcdb | 254 | * Fetches and decodes switch information |
7ea239d9 | 255 | */ |
1addfcdb | 256 | static int mmc_read_switch(struct mmc_card *card) |
7ea239d9 PO |
257 | { |
258 | int err; | |
259 | u8 *status; | |
260 | ||
3373c0ae | 261 | if (card->scr.sda_vsn < SCR_SPEC_VER_1) |
17b0429d | 262 | return 0; |
3373c0ae PO |
263 | |
264 | if (!(card->csd.cmdclass & CCC_SWITCH)) { | |
265 | printk(KERN_WARNING "%s: card lacks mandatory switch " | |
266 | "function, performance might suffer.\n", | |
267 | mmc_hostname(card->host)); | |
17b0429d | 268 | return 0; |
3373c0ae PO |
269 | } |
270 | ||
17b0429d | 271 | err = -EIO; |
7ea239d9 PO |
272 | |
273 | status = kmalloc(64, GFP_KERNEL); | |
274 | if (!status) { | |
facba917 PO |
275 | printk(KERN_ERR "%s: could not allocate a buffer for " |
276 | "switch capabilities.\n", mmc_hostname(card->host)); | |
17b0429d | 277 | return -ENOMEM; |
7ea239d9 PO |
278 | } |
279 | ||
280 | err = mmc_sd_switch(card, 0, 0, 1, status); | |
17b0429d | 281 | if (err) { |
d08ebedd WM |
282 | /* If the host or the card can't do the switch, |
283 | * fail more gracefully. */ | |
284 | if ((err != -EINVAL) | |
285 | && (err != -ENOSYS) | |
286 | && (err != -EFAULT)) | |
adf66a0d PO |
287 | goto out; |
288 | ||
3373c0ae PO |
289 | printk(KERN_WARNING "%s: problem reading switch " |
290 | "capabilities, performance might suffer.\n", | |
291 | mmc_hostname(card->host)); | |
17b0429d | 292 | err = 0; |
adf66a0d | 293 | |
7ea239d9 PO |
294 | goto out; |
295 | } | |
296 | ||
297 | if (status[13] & 0x02) | |
298 | card->sw_caps.hs_max_dtr = 50000000; | |
299 | ||
1addfcdb PO |
300 | out: |
301 | kfree(status); | |
302 | ||
303 | return err; | |
304 | } | |
305 | ||
306 | /* | |
307 | * Test if the card supports high-speed mode and, if so, switch to it. | |
308 | */ | |
71578a1e | 309 | int mmc_sd_switch_hs(struct mmc_card *card) |
1addfcdb PO |
310 | { |
311 | int err; | |
312 | u8 *status; | |
313 | ||
3373c0ae | 314 | if (card->scr.sda_vsn < SCR_SPEC_VER_1) |
17b0429d | 315 | return 0; |
3373c0ae PO |
316 | |
317 | if (!(card->csd.cmdclass & CCC_SWITCH)) | |
17b0429d | 318 | return 0; |
3373c0ae | 319 | |
1addfcdb | 320 | if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) |
17b0429d | 321 | return 0; |
1addfcdb PO |
322 | |
323 | if (card->sw_caps.hs_max_dtr == 0) | |
17b0429d | 324 | return 0; |
1addfcdb | 325 | |
17b0429d | 326 | err = -EIO; |
1addfcdb PO |
327 | |
328 | status = kmalloc(64, GFP_KERNEL); | |
329 | if (!status) { | |
facba917 PO |
330 | printk(KERN_ERR "%s: could not allocate a buffer for " |
331 | "switch capabilities.\n", mmc_hostname(card->host)); | |
17b0429d | 332 | return -ENOMEM; |
1addfcdb PO |
333 | } |
334 | ||
7ea239d9 | 335 | err = mmc_sd_switch(card, 1, 0, 1, status); |
17b0429d | 336 | if (err) |
7ea239d9 PO |
337 | goto out; |
338 | ||
339 | if ((status[16] & 0xF) != 1) { | |
340 | printk(KERN_WARNING "%s: Problem switching card " | |
341 | "into high-speed mode!\n", | |
342 | mmc_hostname(card->host)); | |
71578a1e | 343 | err = 0; |
7ea239d9 | 344 | } else { |
71578a1e | 345 | err = 1; |
7ea239d9 PO |
346 | } |
347 | ||
348 | out: | |
349 | kfree(status); | |
350 | ||
351 | return err; | |
352 | } | |
353 | ||
51ec92e2 PO |
354 | MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], |
355 | card->raw_cid[2], card->raw_cid[3]); | |
356 | MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], | |
357 | card->raw_csd[2], card->raw_csd[3]); | |
358 | MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); | |
359 | MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); | |
dfe86cba AH |
360 | MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); |
361 | MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); | |
51ec92e2 PO |
362 | MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); |
363 | MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); | |
364 | MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); | |
365 | MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); | |
366 | MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); | |
367 | MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); | |
368 | ||
369 | ||
370 | static struct attribute *sd_std_attrs[] = { | |
371 | &dev_attr_cid.attr, | |
372 | &dev_attr_csd.attr, | |
373 | &dev_attr_scr.attr, | |
374 | &dev_attr_date.attr, | |
dfe86cba AH |
375 | &dev_attr_erase_size.attr, |
376 | &dev_attr_preferred_erase_size.attr, | |
51ec92e2 PO |
377 | &dev_attr_fwrev.attr, |
378 | &dev_attr_hwrev.attr, | |
379 | &dev_attr_manfid.attr, | |
380 | &dev_attr_name.attr, | |
381 | &dev_attr_oemid.attr, | |
382 | &dev_attr_serial.attr, | |
383 | NULL, | |
384 | }; | |
385 | ||
386 | static struct attribute_group sd_std_attr_group = { | |
387 | .attrs = sd_std_attrs, | |
388 | }; | |
389 | ||
a4dbd674 | 390 | static const struct attribute_group *sd_attr_groups[] = { |
51ec92e2 PO |
391 | &sd_std_attr_group, |
392 | NULL, | |
393 | }; | |
394 | ||
71578a1e | 395 | struct device_type sd_type = { |
51ec92e2 PO |
396 | .groups = sd_attr_groups, |
397 | }; | |
398 | ||
7ea239d9 | 399 | /* |
71578a1e | 400 | * Fetch CID from card. |
7ea239d9 | 401 | */ |
71578a1e | 402 | int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid) |
7ea239d9 | 403 | { |
7ea239d9 | 404 | int err; |
7ea239d9 | 405 | |
7ea239d9 PO |
406 | /* |
407 | * Since we're changing the OCR value, we seem to | |
408 | * need to tell some cards to go back to the idle | |
409 | * state. We wait 1ms to give cards time to | |
410 | * respond. | |
411 | */ | |
412 | mmc_go_idle(host); | |
413 | ||
414 | /* | |
415 | * If SD_SEND_IF_COND indicates an SD 2.0 | |
416 | * compliant card and we should set bit 30 | |
417 | * of the ocr to indicate that we can handle | |
418 | * block-addressed SDHC cards. | |
419 | */ | |
6abaa0c9 | 420 | err = mmc_send_if_cond(host, ocr); |
17b0429d | 421 | if (!err) |
6abaa0c9 | 422 | ocr |= 1 << 30; |
7ea239d9 | 423 | |
6abaa0c9 | 424 | err = mmc_send_app_op_cond(host, ocr, NULL); |
17b0429d | 425 | if (err) |
71578a1e | 426 | return err; |
7ea239d9 | 427 | |
af517150 DB |
428 | if (mmc_host_is_spi(host)) |
429 | err = mmc_send_cid(host, cid); | |
430 | else | |
431 | err = mmc_all_send_cid(host, cid); | |
71578a1e MM |
432 | |
433 | return err; | |
434 | } | |
435 | ||
436 | int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) | |
437 | { | |
438 | int err; | |
439 | ||
440 | /* | |
441 | * Fetch CSD from card. | |
442 | */ | |
443 | err = mmc_send_csd(card, card->raw_csd); | |
17b0429d | 444 | if (err) |
71578a1e | 445 | return err; |
7ea239d9 | 446 | |
71578a1e MM |
447 | err = mmc_decode_csd(card); |
448 | if (err) | |
449 | return err; | |
450 | ||
451 | return 0; | |
452 | } | |
453 | ||
454 | int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, | |
455 | bool reinit) | |
456 | { | |
457 | int err; | |
458 | ||
459 | if (!reinit) { | |
460 | /* | |
461 | * Fetch SCR from card. | |
462 | */ | |
463 | err = mmc_app_send_scr(card, card->raw_scr); | |
464 | if (err) | |
465 | return err; | |
466 | ||
467 | err = mmc_decode_scr(card); | |
468 | if (err) | |
469 | return err; | |
470 | ||
dfe86cba AH |
471 | /* |
472 | * Fetch and process SD Status register. | |
473 | */ | |
474 | err = mmc_read_ssr(card); | |
475 | if (err) | |
476 | return err; | |
477 | ||
478 | /* Erase init depends on CSD and SSR */ | |
479 | mmc_init_erase(card); | |
480 | ||
71578a1e MM |
481 | /* |
482 | * Fetch switch information from card. | |
483 | */ | |
484 | err = mmc_read_switch(card); | |
485 | if (err) | |
486 | return err; | |
487 | } | |
488 | ||
489 | /* | |
490 | * For SPI, enable CRC as appropriate. | |
491 | * This CRC enable is located AFTER the reading of the | |
492 | * card registers because some SDHC cards are not able | |
493 | * to provide valid CRCs for non-512-byte blocks. | |
494 | */ | |
495 | if (mmc_host_is_spi(host)) { | |
496 | err = mmc_spi_set_crc(host, use_spi_crc); | |
497 | if (err) | |
498 | return err; | |
499 | } | |
500 | ||
501 | /* | |
502 | * Check if read-only switch is active. | |
503 | */ | |
504 | if (!reinit) { | |
505 | int ro = -1; | |
506 | ||
507 | if (host->ops->get_ro) | |
508 | ro = host->ops->get_ro(host); | |
509 | ||
510 | if (ro < 0) { | |
511 | printk(KERN_WARNING "%s: host does not " | |
512 | "support reading read-only " | |
513 | "switch. assuming write-enable.\n", | |
514 | mmc_hostname(host)); | |
515 | } else if (ro > 0) { | |
516 | mmc_card_set_readonly(card); | |
adf66a0d | 517 | } |
71578a1e MM |
518 | } |
519 | ||
520 | return 0; | |
521 | } | |
522 | ||
523 | unsigned mmc_sd_get_max_clock(struct mmc_card *card) | |
524 | { | |
525 | unsigned max_dtr = (unsigned int)-1; | |
526 | ||
527 | if (mmc_card_highspeed(card)) { | |
528 | if (max_dtr > card->sw_caps.hs_max_dtr) | |
529 | max_dtr = card->sw_caps.hs_max_dtr; | |
530 | } else if (max_dtr > card->csd.max_dtr) { | |
531 | max_dtr = card->csd.max_dtr; | |
532 | } | |
533 | ||
534 | return max_dtr; | |
535 | } | |
536 | ||
537 | void mmc_sd_go_highspeed(struct mmc_card *card) | |
538 | { | |
539 | mmc_card_set_highspeed(card); | |
540 | mmc_set_timing(card->host, MMC_TIMING_SD_HS); | |
541 | } | |
542 | ||
543 | /* | |
544 | * Handle the detection and initialisation of a card. | |
545 | * | |
546 | * In the case of a resume, "oldcard" will contain the card | |
547 | * we're trying to reinitialise. | |
548 | */ | |
549 | static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, | |
550 | struct mmc_card *oldcard) | |
551 | { | |
552 | struct mmc_card *card; | |
553 | int err; | |
554 | u32 cid[4]; | |
555 | ||
556 | BUG_ON(!host); | |
557 | WARN_ON(!host->claimed); | |
558 | ||
559 | err = mmc_sd_get_cid(host, ocr, cid); | |
560 | if (err) | |
561 | return err; | |
562 | ||
563 | if (oldcard) { | |
564 | if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) | |
565 | return -ENOENT; | |
7ea239d9 | 566 | |
6abaa0c9 PO |
567 | card = oldcard; |
568 | } else { | |
569 | /* | |
570 | * Allocate card structure. | |
571 | */ | |
51ec92e2 | 572 | card = mmc_alloc_card(host, &sd_type); |
71578a1e MM |
573 | if (IS_ERR(card)) |
574 | return PTR_ERR(card); | |
6abaa0c9 PO |
575 | |
576 | card->type = MMC_TYPE_SD; | |
577 | memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); | |
578 | } | |
7ea239d9 PO |
579 | |
580 | /* | |
af517150 | 581 | * For native busses: get card RCA and quit open drain mode. |
7ea239d9 | 582 | */ |
af517150 DB |
583 | if (!mmc_host_is_spi(host)) { |
584 | err = mmc_send_relative_addr(host, &card->rca); | |
585 | if (err) | |
71578a1e | 586 | return err; |
7ea239d9 | 587 | |
af517150 DB |
588 | mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); |
589 | } | |
7ea239d9 | 590 | |
6abaa0c9 | 591 | if (!oldcard) { |
71578a1e | 592 | err = mmc_sd_get_csd(host, card); |
17b0429d | 593 | if (err) |
71578a1e | 594 | return err; |
bd766312 | 595 | |
6abaa0c9 PO |
596 | mmc_decode_cid(card); |
597 | } | |
7ea239d9 PO |
598 | |
599 | /* | |
6abaa0c9 | 600 | * Select card, as all following commands rely on that. |
7ea239d9 | 601 | */ |
af517150 DB |
602 | if (!mmc_host_is_spi(host)) { |
603 | err = mmc_select_card(card); | |
604 | if (err) | |
71578a1e | 605 | return err; |
6abaa0c9 | 606 | } |
1addfcdb | 607 | |
71578a1e MM |
608 | err = mmc_sd_setup_card(host, card, oldcard != NULL); |
609 | if (err) | |
610 | goto free_card; | |
9d9f25c0 | 611 | |
1addfcdb PO |
612 | /* |
613 | * Attempt to change to high-speed (if supported) | |
7ea239d9 | 614 | */ |
71578a1e MM |
615 | err = mmc_sd_switch_hs(card); |
616 | if (err > 0) | |
617 | mmc_sd_go_highspeed(card); | |
618 | else if (err) | |
7ea239d9 PO |
619 | goto free_card; |
620 | ||
621 | /* | |
71578a1e | 622 | * Set bus speed. |
7ea239d9 | 623 | */ |
71578a1e | 624 | mmc_set_clock(host, mmc_sd_get_max_clock(card)); |
7ea239d9 PO |
625 | |
626 | /* | |
627 | * Switch to wider bus (if supported). | |
628 | */ | |
71651297 | 629 | if ((host->caps & MMC_CAP_4_BIT_DATA) && |
7ea239d9 PO |
630 | (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { |
631 | err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); | |
17b0429d | 632 | if (err) |
7ea239d9 PO |
633 | goto free_card; |
634 | ||
635 | mmc_set_bus_width(host, MMC_BUS_WIDTH_4); | |
636 | } | |
637 | ||
71578a1e | 638 | host->card = card; |
17b0429d | 639 | return 0; |
6abaa0c9 PO |
640 | |
641 | free_card: | |
642 | if (!oldcard) | |
643 | mmc_remove_card(card); | |
6abaa0c9 | 644 | |
adf66a0d | 645 | return err; |
6abaa0c9 PO |
646 | } |
647 | ||
648 | /* | |
649 | * Host is being removed. Free up the current card. | |
650 | */ | |
651 | static void mmc_sd_remove(struct mmc_host *host) | |
652 | { | |
653 | BUG_ON(!host); | |
654 | BUG_ON(!host->card); | |
655 | ||
656 | mmc_remove_card(host->card); | |
657 | host->card = NULL; | |
658 | } | |
659 | ||
660 | /* | |
661 | * Card detection callback from host. | |
662 | */ | |
663 | static void mmc_sd_detect(struct mmc_host *host) | |
664 | { | |
665 | int err; | |
666 | ||
667 | BUG_ON(!host); | |
668 | BUG_ON(!host->card); | |
669 | ||
670 | mmc_claim_host(host); | |
671 | ||
672 | /* | |
673 | * Just check if our card has been removed. | |
674 | */ | |
675 | err = mmc_send_status(host->card, NULL); | |
7ea239d9 PO |
676 | |
677 | mmc_release_host(host); | |
678 | ||
17b0429d | 679 | if (err) { |
4101c16a | 680 | mmc_sd_remove(host); |
6abaa0c9 PO |
681 | |
682 | mmc_claim_host(host); | |
683 | mmc_detach_bus(host); | |
684 | mmc_release_host(host); | |
685 | } | |
686 | } | |
687 | ||
6abaa0c9 PO |
688 | /* |
689 | * Suspend callback from host. | |
690 | */ | |
95cdfb72 | 691 | static int mmc_sd_suspend(struct mmc_host *host) |
6abaa0c9 PO |
692 | { |
693 | BUG_ON(!host); | |
694 | BUG_ON(!host->card); | |
695 | ||
696 | mmc_claim_host(host); | |
af517150 DB |
697 | if (!mmc_host_is_spi(host)) |
698 | mmc_deselect_cards(host); | |
6abaa0c9 PO |
699 | host->card->state &= ~MMC_STATE_HIGHSPEED; |
700 | mmc_release_host(host); | |
95cdfb72 NP |
701 | |
702 | return 0; | |
6abaa0c9 PO |
703 | } |
704 | ||
705 | /* | |
706 | * Resume callback from host. | |
707 | * | |
708 | * This function tries to determine if the same card is still present | |
709 | * and, if so, restore all state to it. | |
710 | */ | |
95cdfb72 | 711 | static int mmc_sd_resume(struct mmc_host *host) |
6abaa0c9 PO |
712 | { |
713 | int err; | |
714 | ||
715 | BUG_ON(!host); | |
716 | BUG_ON(!host->card); | |
717 | ||
718 | mmc_claim_host(host); | |
6abaa0c9 | 719 | err = mmc_sd_init_card(host, host->ocr, host->card); |
2986d0bf PO |
720 | mmc_release_host(host); |
721 | ||
95cdfb72 | 722 | return err; |
6abaa0c9 PO |
723 | } |
724 | ||
eae1aeee AH |
725 | static void mmc_sd_power_restore(struct mmc_host *host) |
726 | { | |
727 | host->card->state &= ~MMC_STATE_HIGHSPEED; | |
728 | mmc_claim_host(host); | |
729 | mmc_sd_init_card(host, host->ocr, host->card); | |
730 | mmc_release_host(host); | |
731 | } | |
732 | ||
6abaa0c9 | 733 | static const struct mmc_bus_ops mmc_sd_ops = { |
9feae246 AH |
734 | .remove = mmc_sd_remove, |
735 | .detect = mmc_sd_detect, | |
736 | .suspend = NULL, | |
737 | .resume = NULL, | |
eae1aeee | 738 | .power_restore = mmc_sd_power_restore, |
9feae246 AH |
739 | }; |
740 | ||
741 | static const struct mmc_bus_ops mmc_sd_ops_unsafe = { | |
6abaa0c9 PO |
742 | .remove = mmc_sd_remove, |
743 | .detect = mmc_sd_detect, | |
744 | .suspend = mmc_sd_suspend, | |
745 | .resume = mmc_sd_resume, | |
eae1aeee | 746 | .power_restore = mmc_sd_power_restore, |
6abaa0c9 PO |
747 | }; |
748 | ||
9feae246 AH |
749 | static void mmc_sd_attach_bus_ops(struct mmc_host *host) |
750 | { | |
751 | const struct mmc_bus_ops *bus_ops; | |
752 | ||
bd68e083 | 753 | if (host->caps & MMC_CAP_NONREMOVABLE || !mmc_assume_removable) |
9feae246 AH |
754 | bus_ops = &mmc_sd_ops_unsafe; |
755 | else | |
756 | bus_ops = &mmc_sd_ops; | |
757 | mmc_attach_bus(host, bus_ops); | |
758 | } | |
759 | ||
6abaa0c9 PO |
760 | /* |
761 | * Starting point for SD card init. | |
762 | */ | |
763 | int mmc_attach_sd(struct mmc_host *host, u32 ocr) | |
764 | { | |
765 | int err; | |
766 | ||
767 | BUG_ON(!host); | |
d84075c8 | 768 | WARN_ON(!host->claimed); |
6abaa0c9 | 769 | |
9feae246 | 770 | mmc_sd_attach_bus_ops(host); |
6abaa0c9 | 771 | |
af517150 DB |
772 | /* |
773 | * We need to get OCR a different way for SPI. | |
774 | */ | |
775 | if (mmc_host_is_spi(host)) { | |
776 | mmc_go_idle(host); | |
777 | ||
778 | err = mmc_spi_read_ocr(host, 0, &ocr); | |
779 | if (err) | |
780 | goto err; | |
781 | } | |
782 | ||
6abaa0c9 PO |
783 | /* |
784 | * Sanity check the voltages that the card claims to | |
785 | * support. | |
786 | */ | |
787 | if (ocr & 0x7F) { | |
788 | printk(KERN_WARNING "%s: card claims to support voltages " | |
789 | "below the defined range. These will be ignored.\n", | |
790 | mmc_hostname(host)); | |
791 | ocr &= ~0x7F; | |
792 | } | |
793 | ||
794 | if (ocr & MMC_VDD_165_195) { | |
795 | printk(KERN_WARNING "%s: SD card claims to support the " | |
796 | "incompletely defined 'low voltage range'. This " | |
797 | "will be ignored.\n", mmc_hostname(host)); | |
798 | ocr &= ~MMC_VDD_165_195; | |
799 | } | |
800 | ||
801 | host->ocr = mmc_select_voltage(host, ocr); | |
802 | ||
803 | /* | |
804 | * Can we support the voltage(s) of the card(s)? | |
805 | */ | |
109b5bed PO |
806 | if (!host->ocr) { |
807 | err = -EINVAL; | |
6abaa0c9 | 808 | goto err; |
109b5bed | 809 | } |
6abaa0c9 PO |
810 | |
811 | /* | |
812 | * Detect and init the card. | |
813 | */ | |
814 | err = mmc_sd_init_card(host, host->ocr, NULL); | |
17b0429d | 815 | if (err) |
6abaa0c9 PO |
816 | goto err; |
817 | ||
818 | mmc_release_host(host); | |
819 | ||
4101c16a | 820 | err = mmc_add_card(host->card); |
7ea239d9 | 821 | if (err) |
2986d0bf | 822 | goto remove_card; |
7ea239d9 PO |
823 | |
824 | return 0; | |
825 | ||
2986d0bf | 826 | remove_card: |
6abaa0c9 | 827 | mmc_remove_card(host->card); |
7ea239d9 | 828 | host->card = NULL; |
2986d0bf | 829 | mmc_claim_host(host); |
7ea239d9 PO |
830 | err: |
831 | mmc_detach_bus(host); | |
832 | mmc_release_host(host); | |
833 | ||
109b5bed PO |
834 | printk(KERN_ERR "%s: error %d whilst initialising SD card\n", |
835 | mmc_hostname(host), err); | |
836 | ||
adf66a0d | 837 | return err; |
7ea239d9 PO |
838 | } |
839 |