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7ea239d9 PO |
1 | /* |
2 | * linux/drivers/mmc/sd.c | |
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> | |
18 | ||
19 | #include "core.h" | |
20 | #include "sysfs.h" | |
21 | #include "mmc_ops.h" | |
22 | #include "sd_ops.h" | |
23 | ||
24 | #include "core.h" | |
25 | ||
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 | */ | |
91 | static void mmc_decode_csd(struct mmc_card *card) | |
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); | |
154 | mmc_card_set_bad(card); | |
155 | return; | |
156 | } | |
157 | } | |
158 | ||
159 | /* | |
160 | * Given a 64-bit response, decode to our card SCR structure. | |
161 | */ | |
162 | static void mmc_decode_scr(struct mmc_card *card) | |
163 | { | |
164 | struct sd_scr *scr = &card->scr; | |
165 | unsigned int scr_struct; | |
166 | u32 resp[4]; | |
167 | ||
168 | BUG_ON(!mmc_card_sd(card)); | |
169 | ||
170 | resp[3] = card->raw_scr[1]; | |
171 | resp[2] = card->raw_scr[0]; | |
172 | ||
173 | scr_struct = UNSTUFF_BITS(resp, 60, 4); | |
174 | if (scr_struct != 0) { | |
175 | printk("%s: unrecognised SCR structure version %d\n", | |
176 | mmc_hostname(card->host), scr_struct); | |
177 | mmc_card_set_bad(card); | |
178 | return; | |
179 | } | |
180 | ||
181 | scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); | |
182 | scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); | |
183 | } | |
184 | ||
185 | /* | |
186 | * Test if the card supports high-speed mode and, if so, switch to it. | |
187 | */ | |
188 | static int mmc_switch_hs(struct mmc_card *card) | |
189 | { | |
190 | int err; | |
191 | u8 *status; | |
192 | ||
193 | if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) | |
194 | return MMC_ERR_NONE; | |
195 | ||
196 | err = MMC_ERR_FAILED; | |
197 | ||
198 | status = kmalloc(64, GFP_KERNEL); | |
199 | if (!status) { | |
200 | printk("%s: could not allocate a buffer for switch " | |
201 | "capabilities.\n", | |
202 | mmc_hostname(card->host)); | |
203 | return err; | |
204 | } | |
205 | ||
206 | err = mmc_sd_switch(card, 0, 0, 1, status); | |
207 | if (err != MMC_ERR_NONE) { | |
208 | /* | |
209 | * Card not supporting high-speed will ignore the | |
210 | * command. | |
211 | */ | |
212 | if (err == MMC_ERR_TIMEOUT) | |
213 | err = MMC_ERR_NONE; | |
214 | goto out; | |
215 | } | |
216 | ||
217 | if (status[13] & 0x02) | |
218 | card->sw_caps.hs_max_dtr = 50000000; | |
219 | ||
220 | err = mmc_sd_switch(card, 1, 0, 1, status); | |
221 | if (err != MMC_ERR_NONE) | |
222 | goto out; | |
223 | ||
224 | if ((status[16] & 0xF) != 1) { | |
225 | printk(KERN_WARNING "%s: Problem switching card " | |
226 | "into high-speed mode!\n", | |
227 | mmc_hostname(card->host)); | |
228 | } else { | |
229 | mmc_card_set_highspeed(card); | |
230 | mmc_set_timing(card->host, MMC_TIMING_SD_HS); | |
231 | } | |
232 | ||
233 | out: | |
234 | kfree(status); | |
235 | ||
236 | return err; | |
237 | } | |
238 | ||
239 | /* | |
240 | * Host is being removed. Free up the current card. | |
241 | */ | |
242 | static void mmc_sd_remove(struct mmc_host *host) | |
243 | { | |
244 | BUG_ON(!host); | |
245 | BUG_ON(!host->card); | |
246 | ||
247 | mmc_remove_card(host->card); | |
248 | host->card = NULL; | |
249 | } | |
250 | ||
251 | /* | |
252 | * Card detection callback from host. | |
253 | */ | |
254 | static void mmc_sd_detect(struct mmc_host *host) | |
255 | { | |
256 | int err; | |
257 | ||
258 | BUG_ON(!host); | |
259 | BUG_ON(!host->card); | |
260 | ||
261 | mmc_claim_host(host); | |
262 | ||
263 | /* | |
264 | * Just check if our card has been removed. | |
265 | */ | |
266 | err = mmc_send_status(host->card, NULL); | |
267 | ||
268 | mmc_release_host(host); | |
269 | ||
270 | if (err != MMC_ERR_NONE) { | |
271 | mmc_remove_card(host->card); | |
272 | host->card = NULL; | |
273 | ||
274 | mmc_claim_host(host); | |
275 | mmc_detach_bus(host); | |
276 | mmc_release_host(host); | |
277 | } | |
278 | } | |
279 | ||
280 | static const struct mmc_bus_ops mmc_sd_ops = { | |
281 | .remove = mmc_sd_remove, | |
282 | .detect = mmc_sd_detect, | |
283 | }; | |
284 | ||
285 | /* | |
286 | * Starting point for SD card init. | |
287 | */ | |
288 | int mmc_attach_sd(struct mmc_host *host, u32 ocr) | |
289 | { | |
290 | struct mmc_card *card; | |
291 | int err; | |
292 | u32 cid[4]; | |
293 | unsigned int max_dtr; | |
294 | ||
295 | BUG_ON(!host); | |
296 | BUG_ON(!host->claimed); | |
297 | ||
298 | mmc_attach_bus(host, &mmc_sd_ops); | |
299 | ||
55556da0 PL |
300 | /* |
301 | * Sanity check the voltages that the card claims to | |
302 | * support. | |
303 | */ | |
304 | if (ocr & 0x7F) { | |
305 | printk(KERN_WARNING "%s: card claims to support voltages " | |
306 | "below the defined range. These will be ignored.\n", | |
307 | mmc_hostname(host)); | |
308 | ocr &= ~0x7F; | |
309 | } | |
310 | ||
311 | if (ocr & MMC_VDD_165_195) { | |
312 | printk(KERN_WARNING "%s: SD card claims to support the " | |
313 | "incompletely defined 'low voltage range'. This " | |
314 | "will be ignored.\n", mmc_hostname(host)); | |
315 | ocr &= ~MMC_VDD_165_195; | |
316 | } | |
317 | ||
7ea239d9 PO |
318 | host->ocr = mmc_select_voltage(host, ocr); |
319 | ||
320 | /* | |
321 | * Can we support the voltage(s) of the card(s)? | |
322 | */ | |
323 | if (!host->ocr) | |
324 | goto err; | |
325 | ||
326 | /* | |
327 | * Since we're changing the OCR value, we seem to | |
328 | * need to tell some cards to go back to the idle | |
329 | * state. We wait 1ms to give cards time to | |
330 | * respond. | |
331 | */ | |
332 | mmc_go_idle(host); | |
333 | ||
334 | /* | |
335 | * If SD_SEND_IF_COND indicates an SD 2.0 | |
336 | * compliant card and we should set bit 30 | |
337 | * of the ocr to indicate that we can handle | |
338 | * block-addressed SDHC cards. | |
339 | */ | |
340 | err = mmc_send_if_cond(host, host->ocr); | |
341 | if (err == MMC_ERR_NONE) | |
342 | ocr = host->ocr | (1 << 30); | |
343 | ||
344 | mmc_send_app_op_cond(host, ocr, NULL); | |
345 | ||
346 | /* | |
347 | * Fetch CID from card. | |
348 | */ | |
349 | err = mmc_all_send_cid(host, cid); | |
350 | if (err != MMC_ERR_NONE) | |
351 | goto err; | |
352 | ||
353 | /* | |
354 | * Allocate card structure. | |
355 | */ | |
356 | card = mmc_alloc_card(host); | |
357 | if (IS_ERR(card)) | |
358 | goto err; | |
359 | ||
360 | card->type = MMC_TYPE_SD; | |
361 | memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); | |
362 | ||
363 | /* | |
364 | * Set card RCA. | |
365 | */ | |
366 | err = mmc_send_relative_addr(host, &card->rca); | |
367 | if (err != MMC_ERR_NONE) | |
368 | goto free_card; | |
369 | ||
370 | mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); | |
371 | ||
372 | /* | |
373 | * Fetch CSD from card. | |
374 | */ | |
375 | err = mmc_send_csd(card, card->raw_csd); | |
376 | if (err != MMC_ERR_NONE) | |
377 | goto free_card; | |
378 | ||
379 | mmc_decode_csd(card); | |
380 | mmc_decode_cid(card); | |
381 | ||
382 | /* | |
383 | * Fetch SCR from card. | |
384 | */ | |
385 | err = mmc_select_card(card); | |
386 | if (err != MMC_ERR_NONE) | |
387 | goto free_card; | |
388 | ||
389 | err = mmc_app_send_scr(card, card->raw_scr); | |
390 | if (err != MMC_ERR_NONE) | |
391 | goto free_card; | |
392 | ||
393 | mmc_decode_scr(card); | |
394 | ||
395 | /* | |
396 | * Check if card can be switched into high-speed mode. | |
397 | */ | |
398 | err = mmc_switch_hs(card); | |
399 | if (err != MMC_ERR_NONE) | |
400 | goto free_card; | |
401 | ||
402 | /* | |
403 | * Compute bus speed. | |
404 | */ | |
405 | max_dtr = (unsigned int)-1; | |
406 | ||
407 | if (mmc_card_highspeed(card)) { | |
408 | if (max_dtr > card->sw_caps.hs_max_dtr) | |
409 | max_dtr = card->sw_caps.hs_max_dtr; | |
410 | } else if (max_dtr > card->csd.max_dtr) { | |
411 | max_dtr = card->csd.max_dtr; | |
412 | } | |
413 | ||
414 | mmc_set_clock(host, max_dtr); | |
415 | ||
416 | /* | |
417 | * Switch to wider bus (if supported). | |
418 | */ | |
419 | if ((host->caps && MMC_CAP_4_BIT_DATA) && | |
420 | (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { | |
421 | err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); | |
422 | if (err != MMC_ERR_NONE) | |
423 | goto free_card; | |
424 | ||
425 | mmc_set_bus_width(host, MMC_BUS_WIDTH_4); | |
426 | } | |
427 | ||
428 | host->card = card; | |
429 | ||
430 | mmc_release_host(host); | |
431 | ||
432 | err = mmc_register_card(card); | |
433 | if (err) | |
434 | goto reclaim_host; | |
435 | ||
436 | return 0; | |
437 | ||
438 | reclaim_host: | |
439 | mmc_claim_host(host); | |
440 | free_card: | |
441 | mmc_remove_card(card); | |
442 | host->card = NULL; | |
443 | err: | |
444 | mmc_detach_bus(host); | |
445 | mmc_release_host(host); | |
446 | ||
447 | return 0; | |
448 | } | |
449 |