Commit | Line | Data |
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1da177e4 | 1 | /* |
aaac1b47 | 2 | * linux/drivers/mmc/core/core.c |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2003-2004 Russell King, All Rights Reserved. | |
5b4fd9ae | 5 | * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. |
b855885e | 6 | * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved. |
bce40a36 | 7 | * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved. |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/completion.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/pagemap.h> | |
20 | #include <linux/err.h> | |
b57c43ad PO |
21 | #include <asm/scatterlist.h> |
22 | #include <linux/scatterlist.h> | |
1da177e4 LT |
23 | |
24 | #include <linux/mmc/card.h> | |
25 | #include <linux/mmc/host.h> | |
da7fbe58 PO |
26 | #include <linux/mmc/mmc.h> |
27 | #include <linux/mmc/sd.h> | |
1da177e4 | 28 | |
aaac1b47 | 29 | #include "core.h" |
da7fbe58 PO |
30 | #include "sysfs.h" |
31 | ||
32 | #include "mmc_ops.h" | |
33 | #include "sd_ops.h" | |
1da177e4 | 34 | |
1da177e4 LT |
35 | #define CMD_RETRIES 3 |
36 | ||
37 | /* | |
38 | * OCR Bit positions to 10s of Vdd mV. | |
39 | */ | |
40 | static const unsigned short mmc_ocr_bit_to_vdd[] = { | |
41 | 150, 155, 160, 165, 170, 180, 190, 200, | |
42 | 210, 220, 230, 240, 250, 260, 270, 280, | |
43 | 290, 300, 310, 320, 330, 340, 350, 360 | |
44 | }; | |
45 | ||
46 | static const unsigned int tran_exp[] = { | |
47 | 10000, 100000, 1000000, 10000000, | |
48 | 0, 0, 0, 0 | |
49 | }; | |
50 | ||
51 | static const unsigned char tran_mant[] = { | |
52 | 0, 10, 12, 13, 15, 20, 25, 30, | |
53 | 35, 40, 45, 50, 55, 60, 70, 80, | |
54 | }; | |
55 | ||
56 | static const unsigned int tacc_exp[] = { | |
57 | 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, | |
58 | }; | |
59 | ||
60 | static const unsigned int tacc_mant[] = { | |
61 | 0, 10, 12, 13, 15, 20, 25, 30, | |
62 | 35, 40, 45, 50, 55, 60, 70, 80, | |
63 | }; | |
64 | ||
65 | ||
66 | /** | |
fe10c6ab RK |
67 | * mmc_request_done - finish processing an MMC request |
68 | * @host: MMC host which completed request | |
69 | * @mrq: MMC request which request | |
1da177e4 LT |
70 | * |
71 | * MMC drivers should call this function when they have completed | |
fe10c6ab | 72 | * their processing of a request. |
1da177e4 LT |
73 | */ |
74 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
75 | { | |
76 | struct mmc_command *cmd = mrq->cmd; | |
920e70c5 RK |
77 | int err = cmd->error; |
78 | ||
79 | pr_debug("%s: req done (CMD%u): %d/%d/%d: %08x %08x %08x %08x\n", | |
80 | mmc_hostname(host), cmd->opcode, err, | |
81 | mrq->data ? mrq->data->error : 0, | |
82 | mrq->stop ? mrq->stop->error : 0, | |
83 | cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]); | |
1da177e4 LT |
84 | |
85 | if (err && cmd->retries) { | |
86 | cmd->retries--; | |
87 | cmd->error = 0; | |
88 | host->ops->request(host, mrq); | |
89 | } else if (mrq->done) { | |
90 | mrq->done(mrq); | |
91 | } | |
92 | } | |
93 | ||
94 | EXPORT_SYMBOL(mmc_request_done); | |
95 | ||
96 | /** | |
97 | * mmc_start_request - start a command on a host | |
98 | * @host: MMC host to start command on | |
99 | * @mrq: MMC request to start | |
100 | * | |
101 | * Queue a command on the specified host. We expect the | |
102 | * caller to be holding the host lock with interrupts disabled. | |
103 | */ | |
104 | void | |
105 | mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) | |
106 | { | |
976d9276 PO |
107 | #ifdef CONFIG_MMC_DEBUG |
108 | unsigned int i, sz; | |
109 | #endif | |
110 | ||
920e70c5 RK |
111 | pr_debug("%s: starting CMD%u arg %08x flags %08x\n", |
112 | mmc_hostname(host), mrq->cmd->opcode, | |
113 | mrq->cmd->arg, mrq->cmd->flags); | |
1da177e4 | 114 | |
f22ee4ed | 115 | WARN_ON(!host->claimed); |
1da177e4 LT |
116 | |
117 | mrq->cmd->error = 0; | |
118 | mrq->cmd->mrq = mrq; | |
119 | if (mrq->data) { | |
fe4a3c7a | 120 | BUG_ON(mrq->data->blksz > host->max_blk_size); |
55db890a PO |
121 | BUG_ON(mrq->data->blocks > host->max_blk_count); |
122 | BUG_ON(mrq->data->blocks * mrq->data->blksz > | |
123 | host->max_req_size); | |
fe4a3c7a | 124 | |
976d9276 PO |
125 | #ifdef CONFIG_MMC_DEBUG |
126 | sz = 0; | |
127 | for (i = 0;i < mrq->data->sg_len;i++) | |
128 | sz += mrq->data->sg[i].length; | |
129 | BUG_ON(sz != mrq->data->blocks * mrq->data->blksz); | |
130 | #endif | |
131 | ||
1da177e4 LT |
132 | mrq->cmd->data = mrq->data; |
133 | mrq->data->error = 0; | |
134 | mrq->data->mrq = mrq; | |
135 | if (mrq->stop) { | |
136 | mrq->data->stop = mrq->stop; | |
137 | mrq->stop->error = 0; | |
138 | mrq->stop->mrq = mrq; | |
139 | } | |
140 | } | |
141 | host->ops->request(host, mrq); | |
142 | } | |
143 | ||
144 | EXPORT_SYMBOL(mmc_start_request); | |
145 | ||
146 | static void mmc_wait_done(struct mmc_request *mrq) | |
147 | { | |
148 | complete(mrq->done_data); | |
149 | } | |
150 | ||
151 | int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
152 | { | |
0afffc72 | 153 | DECLARE_COMPLETION_ONSTACK(complete); |
1da177e4 LT |
154 | |
155 | mrq->done_data = &complete; | |
156 | mrq->done = mmc_wait_done; | |
157 | ||
158 | mmc_start_request(host, mrq); | |
159 | ||
160 | wait_for_completion(&complete); | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | EXPORT_SYMBOL(mmc_wait_for_req); | |
166 | ||
167 | /** | |
168 | * mmc_wait_for_cmd - start a command and wait for completion | |
169 | * @host: MMC host to start command | |
170 | * @cmd: MMC command to start | |
171 | * @retries: maximum number of retries | |
172 | * | |
173 | * Start a new MMC command for a host, and wait for the command | |
174 | * to complete. Return any error that occurred while the command | |
175 | * was executing. Do not attempt to parse the response. | |
176 | */ | |
177 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
178 | { | |
179 | struct mmc_request mrq; | |
180 | ||
f22ee4ed | 181 | BUG_ON(!host->claimed); |
1da177e4 LT |
182 | |
183 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
184 | ||
185 | memset(cmd->resp, 0, sizeof(cmd->resp)); | |
186 | cmd->retries = retries; | |
187 | ||
188 | mrq.cmd = cmd; | |
189 | cmd->data = NULL; | |
190 | ||
191 | mmc_wait_for_req(host, &mrq); | |
192 | ||
193 | return cmd->error; | |
194 | } | |
195 | ||
196 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
197 | ||
d773d725 RK |
198 | /** |
199 | * mmc_set_data_timeout - set the timeout for a data command | |
200 | * @data: data phase for command | |
201 | * @card: the MMC card associated with the data transfer | |
202 | * @write: flag to differentiate reads from writes | |
203 | */ | |
204 | void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card, | |
205 | int write) | |
206 | { | |
207 | unsigned int mult; | |
208 | ||
209 | /* | |
210 | * SD cards use a 100 multiplier rather than 10 | |
211 | */ | |
212 | mult = mmc_card_sd(card) ? 100 : 10; | |
213 | ||
214 | /* | |
215 | * Scale up the multiplier (and therefore the timeout) by | |
216 | * the r2w factor for writes. | |
217 | */ | |
218 | if (write) | |
219 | mult <<= card->csd.r2w_factor; | |
220 | ||
221 | data->timeout_ns = card->csd.tacc_ns * mult; | |
222 | data->timeout_clks = card->csd.tacc_clks * mult; | |
223 | ||
224 | /* | |
225 | * SD cards also have an upper limit on the timeout. | |
226 | */ | |
227 | if (mmc_card_sd(card)) { | |
228 | unsigned int timeout_us, limit_us; | |
229 | ||
230 | timeout_us = data->timeout_ns / 1000; | |
231 | timeout_us += data->timeout_clks * 1000 / | |
232 | (card->host->ios.clock / 1000); | |
233 | ||
234 | if (write) | |
235 | limit_us = 250000; | |
236 | else | |
237 | limit_us = 100000; | |
238 | ||
fba68bd2 PL |
239 | /* |
240 | * SDHC cards always use these fixed values. | |
241 | */ | |
242 | if (timeout_us > limit_us || mmc_card_blockaddr(card)) { | |
d773d725 RK |
243 | data->timeout_ns = limit_us * 1000; |
244 | data->timeout_clks = 0; | |
245 | } | |
246 | } | |
247 | } | |
248 | EXPORT_SYMBOL(mmc_set_data_timeout); | |
249 | ||
1da177e4 LT |
250 | /** |
251 | * __mmc_claim_host - exclusively claim a host | |
252 | * @host: mmc host to claim | |
253 | * @card: mmc card to claim host for | |
254 | * | |
255 | * Claim a host for a set of operations. If a valid card | |
256 | * is passed and this wasn't the last card selected, select | |
257 | * the card before returning. | |
258 | * | |
259 | * Note: you should use mmc_card_claim_host or mmc_claim_host. | |
260 | */ | |
b855885e | 261 | void mmc_claim_host(struct mmc_host *host) |
1da177e4 LT |
262 | { |
263 | DECLARE_WAITQUEUE(wait, current); | |
264 | unsigned long flags; | |
1da177e4 LT |
265 | |
266 | add_wait_queue(&host->wq, &wait); | |
267 | spin_lock_irqsave(&host->lock, flags); | |
268 | while (1) { | |
269 | set_current_state(TASK_UNINTERRUPTIBLE); | |
f22ee4ed | 270 | if (!host->claimed) |
1da177e4 LT |
271 | break; |
272 | spin_unlock_irqrestore(&host->lock, flags); | |
273 | schedule(); | |
274 | spin_lock_irqsave(&host->lock, flags); | |
275 | } | |
276 | set_current_state(TASK_RUNNING); | |
f22ee4ed | 277 | host->claimed = 1; |
1da177e4 LT |
278 | spin_unlock_irqrestore(&host->lock, flags); |
279 | remove_wait_queue(&host->wq, &wait); | |
1da177e4 LT |
280 | } |
281 | ||
b855885e | 282 | EXPORT_SYMBOL(mmc_claim_host); |
1da177e4 LT |
283 | |
284 | /** | |
285 | * mmc_release_host - release a host | |
286 | * @host: mmc host to release | |
287 | * | |
288 | * Release a MMC host, allowing others to claim the host | |
289 | * for their operations. | |
290 | */ | |
291 | void mmc_release_host(struct mmc_host *host) | |
292 | { | |
293 | unsigned long flags; | |
294 | ||
f22ee4ed | 295 | BUG_ON(!host->claimed); |
1da177e4 LT |
296 | |
297 | spin_lock_irqsave(&host->lock, flags); | |
f22ee4ed | 298 | host->claimed = 0; |
1da177e4 LT |
299 | spin_unlock_irqrestore(&host->lock, flags); |
300 | ||
301 | wake_up(&host->wq); | |
302 | } | |
303 | ||
304 | EXPORT_SYMBOL(mmc_release_host); | |
305 | ||
920e70c5 RK |
306 | static inline void mmc_set_ios(struct mmc_host *host) |
307 | { | |
308 | struct mmc_ios *ios = &host->ios; | |
309 | ||
cd9277c0 PO |
310 | pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u " |
311 | "width %u timing %u\n", | |
920e70c5 RK |
312 | mmc_hostname(host), ios->clock, ios->bus_mode, |
313 | ios->power_mode, ios->chip_select, ios->vdd, | |
cd9277c0 | 314 | ios->bus_width, ios->timing); |
fba68bd2 | 315 | |
920e70c5 RK |
316 | host->ops->set_ios(host, ios); |
317 | } | |
318 | ||
da7fbe58 | 319 | void mmc_set_chip_select(struct mmc_host *host, int mode) |
1da177e4 | 320 | { |
da7fbe58 PO |
321 | host->ios.chip_select = mode; |
322 | mmc_set_ios(host); | |
1da177e4 LT |
323 | } |
324 | ||
325 | /* | |
326 | * Mask off any voltages we don't support and select | |
327 | * the lowest voltage | |
328 | */ | |
329 | static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) | |
330 | { | |
331 | int bit; | |
332 | ||
333 | ocr &= host->ocr_avail; | |
334 | ||
335 | bit = ffs(ocr); | |
336 | if (bit) { | |
337 | bit -= 1; | |
338 | ||
63ef731a | 339 | ocr &= 3 << bit; |
1da177e4 LT |
340 | |
341 | host->ios.vdd = bit; | |
920e70c5 | 342 | mmc_set_ios(host); |
1da177e4 LT |
343 | } else { |
344 | ocr = 0; | |
345 | } | |
346 | ||
347 | return ocr; | |
348 | } | |
349 | ||
350 | #define UNSTUFF_BITS(resp,start,size) \ | |
351 | ({ \ | |
352 | const int __size = size; \ | |
353 | const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ | |
354 | const int __off = 3 - ((start) / 32); \ | |
355 | const int __shft = (start) & 31; \ | |
356 | u32 __res; \ | |
357 | \ | |
358 | __res = resp[__off] >> __shft; \ | |
359 | if (__size + __shft > 32) \ | |
360 | __res |= resp[__off-1] << ((32 - __shft) % 32); \ | |
361 | __res & __mask; \ | |
362 | }) | |
363 | ||
364 | /* | |
365 | * Given the decoded CSD structure, decode the raw CID to our CID structure. | |
366 | */ | |
367 | static void mmc_decode_cid(struct mmc_card *card) | |
368 | { | |
369 | u32 *resp = card->raw_cid; | |
370 | ||
371 | memset(&card->cid, 0, sizeof(struct mmc_cid)); | |
372 | ||
335eadf2 PO |
373 | if (mmc_card_sd(card)) { |
374 | /* | |
375 | * SD doesn't currently have a version field so we will | |
376 | * have to assume we can parse this. | |
377 | */ | |
378 | card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); | |
379 | card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); | |
380 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
381 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
382 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
383 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
384 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
385 | card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); | |
386 | card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); | |
387 | card->cid.serial = UNSTUFF_BITS(resp, 24, 32); | |
388 | card->cid.year = UNSTUFF_BITS(resp, 12, 8); | |
389 | card->cid.month = UNSTUFF_BITS(resp, 8, 4); | |
390 | ||
391 | card->cid.year += 2000; /* SD cards year offset */ | |
a00fc090 | 392 | } else { |
335eadf2 PO |
393 | /* |
394 | * The selection of the format here is based upon published | |
395 | * specs from sandisk and from what people have reported. | |
396 | */ | |
397 | switch (card->csd.mmca_vsn) { | |
398 | case 0: /* MMC v1.0 - v1.2 */ | |
399 | case 1: /* MMC v1.4 */ | |
400 | card->cid.manfid = UNSTUFF_BITS(resp, 104, 24); | |
401 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
402 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
403 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
404 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
405 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
406 | card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); | |
407 | card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8); | |
408 | card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4); | |
409 | card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4); | |
410 | card->cid.serial = UNSTUFF_BITS(resp, 16, 24); | |
411 | card->cid.month = UNSTUFF_BITS(resp, 12, 4); | |
412 | card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; | |
413 | break; | |
414 | ||
415 | case 2: /* MMC v2.0 - v2.2 */ | |
416 | case 3: /* MMC v3.1 - v3.3 */ | |
cb757b4e | 417 | case 4: /* MMC v4 */ |
335eadf2 PO |
418 | card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); |
419 | card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); | |
420 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
421 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
422 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
423 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
424 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
425 | card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); | |
426 | card->cid.serial = UNSTUFF_BITS(resp, 16, 32); | |
427 | card->cid.month = UNSTUFF_BITS(resp, 12, 4); | |
428 | card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; | |
429 | break; | |
430 | ||
431 | default: | |
432 | printk("%s: card has unknown MMCA version %d\n", | |
433 | mmc_hostname(card->host), card->csd.mmca_vsn); | |
434 | mmc_card_set_bad(card); | |
435 | break; | |
436 | } | |
1da177e4 LT |
437 | } |
438 | } | |
439 | ||
440 | /* | |
441 | * Given a 128-bit response, decode to our card CSD structure. | |
442 | */ | |
443 | static void mmc_decode_csd(struct mmc_card *card) | |
444 | { | |
445 | struct mmc_csd *csd = &card->csd; | |
446 | unsigned int e, m, csd_struct; | |
447 | u32 *resp = card->raw_csd; | |
448 | ||
335eadf2 PO |
449 | if (mmc_card_sd(card)) { |
450 | csd_struct = UNSTUFF_BITS(resp, 126, 2); | |
fba68bd2 PL |
451 | |
452 | switch (csd_struct) { | |
453 | case 0: | |
454 | m = UNSTUFF_BITS(resp, 115, 4); | |
455 | e = UNSTUFF_BITS(resp, 112, 3); | |
456 | csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; | |
457 | csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; | |
458 | ||
459 | m = UNSTUFF_BITS(resp, 99, 4); | |
460 | e = UNSTUFF_BITS(resp, 96, 3); | |
461 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
462 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
463 | ||
464 | e = UNSTUFF_BITS(resp, 47, 3); | |
465 | m = UNSTUFF_BITS(resp, 62, 12); | |
466 | csd->capacity = (1 + m) << (e + 2); | |
467 | ||
468 | csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); | |
469 | csd->read_partial = UNSTUFF_BITS(resp, 79, 1); | |
470 | csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); | |
471 | csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); | |
472 | csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); | |
473 | csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); | |
474 | csd->write_partial = UNSTUFF_BITS(resp, 21, 1); | |
475 | break; | |
476 | case 1: | |
477 | /* | |
478 | * This is a block-addressed SDHC card. Most | |
479 | * interesting fields are unused and have fixed | |
480 | * values. To avoid getting tripped by buggy cards, | |
481 | * we assume those fixed values ourselves. | |
482 | */ | |
483 | mmc_card_set_blockaddr(card); | |
484 | ||
485 | csd->tacc_ns = 0; /* Unused */ | |
486 | csd->tacc_clks = 0; /* Unused */ | |
487 | ||
488 | m = UNSTUFF_BITS(resp, 99, 4); | |
489 | e = UNSTUFF_BITS(resp, 96, 3); | |
490 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
491 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
492 | ||
493 | m = UNSTUFF_BITS(resp, 48, 22); | |
494 | csd->capacity = (1 + m) << 10; | |
495 | ||
496 | csd->read_blkbits = 9; | |
497 | csd->read_partial = 0; | |
498 | csd->write_misalign = 0; | |
499 | csd->read_misalign = 0; | |
500 | csd->r2w_factor = 4; /* Unused */ | |
501 | csd->write_blkbits = 9; | |
502 | csd->write_partial = 0; | |
503 | break; | |
504 | default: | |
335eadf2 PO |
505 | printk("%s: unrecognised CSD structure version %d\n", |
506 | mmc_hostname(card->host), csd_struct); | |
507 | mmc_card_set_bad(card); | |
508 | return; | |
509 | } | |
a00fc090 | 510 | } else { |
335eadf2 PO |
511 | /* |
512 | * We only understand CSD structure v1.1 and v1.2. | |
513 | * v1.2 has extra information in bits 15, 11 and 10. | |
514 | */ | |
515 | csd_struct = UNSTUFF_BITS(resp, 126, 2); | |
516 | if (csd_struct != 1 && csd_struct != 2) { | |
517 | printk("%s: unrecognised CSD structure version %d\n", | |
518 | mmc_hostname(card->host), csd_struct); | |
519 | mmc_card_set_bad(card); | |
520 | return; | |
521 | } | |
1da177e4 | 522 | |
335eadf2 PO |
523 | csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4); |
524 | m = UNSTUFF_BITS(resp, 115, 4); | |
525 | e = UNSTUFF_BITS(resp, 112, 3); | |
526 | csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; | |
527 | csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; | |
1da177e4 | 528 | |
335eadf2 PO |
529 | m = UNSTUFF_BITS(resp, 99, 4); |
530 | e = UNSTUFF_BITS(resp, 96, 3); | |
531 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
532 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
1da177e4 | 533 | |
335eadf2 PO |
534 | e = UNSTUFF_BITS(resp, 47, 3); |
535 | m = UNSTUFF_BITS(resp, 62, 12); | |
536 | csd->capacity = (1 + m) << (e + 2); | |
1da177e4 | 537 | |
335eadf2 | 538 | csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); |
a6f6c96b RK |
539 | csd->read_partial = UNSTUFF_BITS(resp, 79, 1); |
540 | csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); | |
541 | csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); | |
37be4e78 | 542 | csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); |
a6f6c96b RK |
543 | csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); |
544 | csd->write_partial = UNSTUFF_BITS(resp, 21, 1); | |
335eadf2 | 545 | } |
1da177e4 LT |
546 | } |
547 | ||
b57c43ad PO |
548 | /* |
549 | * Given a 64-bit response, decode to our card SCR structure. | |
550 | */ | |
551 | static void mmc_decode_scr(struct mmc_card *card) | |
552 | { | |
553 | struct sd_scr *scr = &card->scr; | |
554 | unsigned int scr_struct; | |
555 | u32 resp[4]; | |
556 | ||
557 | BUG_ON(!mmc_card_sd(card)); | |
558 | ||
559 | resp[3] = card->raw_scr[1]; | |
560 | resp[2] = card->raw_scr[0]; | |
561 | ||
562 | scr_struct = UNSTUFF_BITS(resp, 60, 4); | |
563 | if (scr_struct != 0) { | |
564 | printk("%s: unrecognised SCR structure version %d\n", | |
565 | mmc_hostname(card->host), scr_struct); | |
566 | mmc_card_set_bad(card); | |
567 | return; | |
568 | } | |
569 | ||
570 | scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); | |
571 | scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); | |
572 | } | |
573 | ||
1da177e4 | 574 | /* |
b855885e | 575 | * Allocate a new MMC card |
1da177e4 LT |
576 | */ |
577 | static struct mmc_card * | |
b855885e | 578 | mmc_alloc_card(struct mmc_host *host, u32 *raw_cid) |
1da177e4 | 579 | { |
b855885e | 580 | struct mmc_card *card; |
1da177e4 LT |
581 | |
582 | card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL); | |
583 | if (!card) | |
584 | return ERR_PTR(-ENOMEM); | |
585 | ||
586 | mmc_init_card(card, host); | |
587 | memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid)); | |
588 | ||
1da177e4 LT |
589 | return card; |
590 | } | |
591 | ||
1da177e4 | 592 | /* |
45f8245b RK |
593 | * Apply power to the MMC stack. This is a two-stage process. |
594 | * First, we enable power to the card without the clock running. | |
595 | * We then wait a bit for the power to stabilise. Finally, | |
596 | * enable the bus drivers and clock to the card. | |
597 | * | |
598 | * We must _NOT_ enable the clock prior to power stablising. | |
599 | * | |
600 | * If a host does all the power sequencing itself, ignore the | |
601 | * initial MMC_POWER_UP stage. | |
1da177e4 LT |
602 | */ |
603 | static void mmc_power_up(struct mmc_host *host) | |
604 | { | |
605 | int bit = fls(host->ocr_avail) - 1; | |
606 | ||
607 | host->ios.vdd = bit; | |
608 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
865e9f13 | 609 | host->ios.chip_select = MMC_CS_DONTCARE; |
1da177e4 | 610 | host->ios.power_mode = MMC_POWER_UP; |
f218278a | 611 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 612 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 613 | mmc_set_ios(host); |
1da177e4 LT |
614 | |
615 | mmc_delay(1); | |
616 | ||
617 | host->ios.clock = host->f_min; | |
618 | host->ios.power_mode = MMC_POWER_ON; | |
920e70c5 | 619 | mmc_set_ios(host); |
1da177e4 LT |
620 | |
621 | mmc_delay(2); | |
622 | } | |
623 | ||
624 | static void mmc_power_off(struct mmc_host *host) | |
625 | { | |
626 | host->ios.clock = 0; | |
627 | host->ios.vdd = 0; | |
628 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
865e9f13 | 629 | host->ios.chip_select = MMC_CS_DONTCARE; |
1da177e4 | 630 | host->ios.power_mode = MMC_POWER_OFF; |
f218278a | 631 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 632 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 633 | mmc_set_ios(host); |
1da177e4 LT |
634 | } |
635 | ||
1da177e4 | 636 | /* |
b855885e | 637 | * Discover the card by requesting its CID. |
1da177e4 | 638 | * |
b855885e | 639 | * Create a mmc_card entry for the discovered card, assigning |
1da177e4 LT |
640 | * it an RCA, and save the raw CID for decoding later. |
641 | */ | |
b855885e | 642 | static void mmc_discover_card(struct mmc_host *host) |
1da177e4 | 643 | { |
b855885e | 644 | unsigned int err; |
da7fbe58 | 645 | u32 cid[4]; |
1da177e4 | 646 | |
b855885e PO |
647 | BUG_ON(host->card); |
648 | ||
da7fbe58 | 649 | err = mmc_all_send_cid(host, cid); |
b855885e PO |
650 | if (err != MMC_ERR_NONE) { |
651 | printk(KERN_ERR "%s: error requesting CID: %d\n", | |
652 | mmc_hostname(host), err); | |
653 | return; | |
654 | } | |
655 | ||
da7fbe58 | 656 | host->card = mmc_alloc_card(host, cid); |
b855885e PO |
657 | if (IS_ERR(host->card)) { |
658 | err = PTR_ERR(host->card); | |
659 | host->card = NULL; | |
660 | return; | |
661 | } | |
662 | ||
663 | if (host->mode == MMC_MODE_SD) { | |
664 | host->card->type = MMC_TYPE_SD; | |
665 | ||
da7fbe58 | 666 | err = mmc_send_relative_addr(host, &host->card->rca); |
b855885e PO |
667 | if (err != MMC_ERR_NONE) |
668 | mmc_card_set_dead(host->card); | |
669 | else { | |
b855885e PO |
670 | if (!host->ops->get_ro) { |
671 | printk(KERN_WARNING "%s: host does not " | |
672 | "support reading read-only " | |
673 | "switch. assuming write-enable.\n", | |
674 | mmc_hostname(host)); | |
675 | } else { | |
676 | if (host->ops->get_ro(host)) | |
677 | mmc_card_set_readonly(host->card); | |
1da177e4 | 678 | } |
1da177e4 | 679 | } |
b855885e PO |
680 | } else { |
681 | host->card->type = MMC_TYPE_MMC; | |
682 | host->card->rca = 1; | |
1da177e4 | 683 | |
da7fbe58 | 684 | err = mmc_set_relative_addr(host->card); |
b855885e PO |
685 | if (err != MMC_ERR_NONE) |
686 | mmc_card_set_dead(host->card); | |
1da177e4 LT |
687 | } |
688 | } | |
689 | ||
b855885e | 690 | static void mmc_read_csd(struct mmc_host *host) |
1da177e4 | 691 | { |
b855885e | 692 | int err; |
1da177e4 | 693 | |
b855885e PO |
694 | if (!host->card) |
695 | return; | |
696 | if (mmc_card_dead(host->card)) | |
697 | return; | |
1da177e4 | 698 | |
da7fbe58 | 699 | err = mmc_send_csd(host->card, host->card->raw_csd); |
b855885e PO |
700 | if (err != MMC_ERR_NONE) { |
701 | mmc_card_set_dead(host->card); | |
702 | return; | |
703 | } | |
1da177e4 | 704 | |
b855885e PO |
705 | mmc_decode_csd(host->card); |
706 | mmc_decode_cid(host->card); | |
1da177e4 LT |
707 | } |
708 | ||
b855885e | 709 | static void mmc_process_ext_csd(struct mmc_host *host) |
bce40a36 PL |
710 | { |
711 | int err; | |
b855885e | 712 | u8 *ext_csd; |
bce40a36 | 713 | |
b855885e PO |
714 | if (!host->card) |
715 | return; | |
716 | if (mmc_card_dead(host->card)) | |
717 | return; | |
718 | if (mmc_card_sd(host->card)) | |
719 | return; | |
720 | if (host->card->csd.mmca_vsn < CSD_SPEC_VER_4) | |
721 | return; | |
722 | ||
bce40a36 PL |
723 | /* |
724 | * As the ext_csd is so large and mostly unused, we don't store the | |
725 | * raw block in mmc_card. | |
726 | */ | |
bce40a36 PL |
727 | ext_csd = kmalloc(512, GFP_KERNEL); |
728 | if (!ext_csd) { | |
729 | printk("%s: could not allocate a buffer to receive the ext_csd." | |
730 | "mmc v4 cards will be treated as v3.\n", | |
731 | mmc_hostname(host)); | |
732 | return; | |
733 | } | |
734 | ||
da7fbe58 PO |
735 | err = mmc_send_ext_csd(host->card, ext_csd); |
736 | if (err != MMC_ERR_NONE) { | |
b855885e PO |
737 | if (host->card->csd.capacity == (4096 * 512)) { |
738 | printk(KERN_ERR "%s: unable to read EXT_CSD " | |
739 | "on a possible high capacity card. " | |
740 | "Card will be ignored.\n", | |
741 | mmc_hostname(host)); | |
742 | mmc_card_set_dead(host->card); | |
743 | } else { | |
744 | printk(KERN_WARNING "%s: unable to read " | |
745 | "EXT_CSD, performance might " | |
746 | "suffer.\n", | |
747 | mmc_hostname(host)); | |
bce40a36 | 748 | } |
b855885e PO |
749 | goto out; |
750 | } | |
bce40a36 | 751 | |
b855885e PO |
752 | host->card->ext_csd.sectors = |
753 | ext_csd[EXT_CSD_SEC_CNT + 0] << 0 | | |
754 | ext_csd[EXT_CSD_SEC_CNT + 1] << 8 | | |
755 | ext_csd[EXT_CSD_SEC_CNT + 2] << 16 | | |
756 | ext_csd[EXT_CSD_SEC_CNT + 3] << 24; | |
757 | if (host->card->ext_csd.sectors) | |
758 | mmc_card_set_blockaddr(host->card); | |
759 | ||
760 | switch (ext_csd[EXT_CSD_CARD_TYPE]) { | |
761 | case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26: | |
762 | host->card->ext_csd.hs_max_dtr = 52000000; | |
763 | break; | |
764 | case EXT_CSD_CARD_TYPE_26: | |
765 | host->card->ext_csd.hs_max_dtr = 26000000; | |
766 | break; | |
767 | default: | |
768 | /* MMC v4 spec says this cannot happen */ | |
769 | printk("%s: card is mmc v4 but doesn't support " | |
770 | "any high-speed modes.\n", | |
771 | mmc_hostname(host)); | |
772 | goto out; | |
773 | } | |
85a18ad9 | 774 | |
b855885e PO |
775 | if (host->caps & MMC_CAP_MMC_HIGHSPEED) { |
776 | /* Activate highspeed support. */ | |
da7fbe58 PO |
777 | err = mmc_switch(host->card, MMC_SWITCH_MODE_WRITE_BYTE, |
778 | EXT_CSD_HS_TIMING, 1); | |
b855885e PO |
779 | if (err != MMC_ERR_NONE) { |
780 | printk("%s: failed to switch card to mmc v4 " | |
781 | "high-speed mode.\n", | |
782 | mmc_hostname(host)); | |
783 | goto out; | |
784 | } | |
bce40a36 | 785 | |
b855885e | 786 | mmc_card_set_highspeed(host->card); |
e45a1bd2 | 787 | |
b855885e PO |
788 | host->ios.timing = MMC_TIMING_MMC_HS; |
789 | mmc_set_ios(host); | |
790 | } | |
e45a1bd2 | 791 | |
b855885e PO |
792 | /* Check for host support for wide-bus modes. */ |
793 | if (host->caps & MMC_CAP_4_BIT_DATA) { | |
794 | /* Activate 4-bit support. */ | |
da7fbe58 PO |
795 | err = mmc_switch(host->card, MMC_SWITCH_MODE_WRITE_BYTE, |
796 | EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4 | | |
797 | EXT_CSD_CMD_SET_NORMAL); | |
b855885e PO |
798 | if (err != MMC_ERR_NONE) { |
799 | printk("%s: failed to switch card to " | |
800 | "mmc v4 4-bit bus mode.\n", | |
801 | mmc_hostname(host)); | |
802 | goto out; | |
cd9277c0 | 803 | } |
b855885e PO |
804 | |
805 | host->ios.bus_width = MMC_BUS_WIDTH_4; | |
806 | mmc_set_ios(host); | |
bce40a36 PL |
807 | } |
808 | ||
b855885e | 809 | out: |
bce40a36 | 810 | kfree(ext_csd); |
bce40a36 PL |
811 | } |
812 | ||
b855885e | 813 | static void mmc_read_scr(struct mmc_host *host) |
b57c43ad PO |
814 | { |
815 | int err; | |
b57c43ad | 816 | |
b855885e PO |
817 | if (!host->card) |
818 | return; | |
819 | if (mmc_card_dead(host->card)) | |
820 | return; | |
821 | if (!mmc_card_sd(host->card)) | |
822 | return; | |
b57c43ad | 823 | |
da7fbe58 PO |
824 | err = mmc_app_send_scr(host->card, host->card->raw_scr); |
825 | if (err != MMC_ERR_NONE) { | |
b855885e PO |
826 | mmc_card_set_dead(host->card); |
827 | return; | |
b57c43ad PO |
828 | } |
829 | ||
b855885e | 830 | mmc_decode_scr(host->card); |
b57c43ad PO |
831 | } |
832 | ||
7ccd266e PO |
833 | static void mmc_read_switch_caps(struct mmc_host *host) |
834 | { | |
da7fbe58 | 835 | int err; |
7ccd266e | 836 | unsigned char *status; |
7ccd266e | 837 | |
cd9277c0 PO |
838 | if (!(host->caps & MMC_CAP_SD_HIGHSPEED)) |
839 | return; | |
840 | ||
b855885e PO |
841 | if (!host->card) |
842 | return; | |
843 | if (mmc_card_dead(host->card)) | |
844 | return; | |
845 | if (!mmc_card_sd(host->card)) | |
846 | return; | |
847 | if (host->card->scr.sda_vsn < SCR_SPEC_VER_1) | |
848 | return; | |
849 | ||
7ccd266e PO |
850 | status = kmalloc(64, GFP_KERNEL); |
851 | if (!status) { | |
852 | printk(KERN_WARNING "%s: Unable to allocate buffer for " | |
853 | "reading switch capabilities.\n", | |
854 | mmc_hostname(host)); | |
855 | return; | |
856 | } | |
857 | ||
da7fbe58 PO |
858 | err = mmc_sd_switch(host->card, SD_SWITCH_CHECK, |
859 | SD_SWITCH_GRP_ACCESS, SD_SWITCH_ACCESS_HS, status); | |
860 | if (err != MMC_ERR_NONE) { | |
b855885e PO |
861 | printk("%s: unable to read switch capabilities, " |
862 | "performance might suffer.\n", | |
863 | mmc_hostname(host)); | |
864 | goto out; | |
865 | } | |
7ccd266e | 866 | |
b855885e PO |
867 | if (status[13] & 0x02) |
868 | host->card->sw_caps.hs_max_dtr = 50000000; | |
7ccd266e | 869 | |
da7fbe58 PO |
870 | err = mmc_sd_switch(host->card, SD_SWITCH_SET, |
871 | SD_SWITCH_GRP_ACCESS, SD_SWITCH_ACCESS_HS, status); | |
872 | if (err != MMC_ERR_NONE || (status[16] & 0xF) != 1) { | |
b855885e PO |
873 | printk(KERN_WARNING "%s: Problem switching card " |
874 | "into high-speed mode!\n", | |
875 | mmc_hostname(host)); | |
876 | goto out; | |
877 | } | |
7ccd266e | 878 | |
b855885e | 879 | mmc_card_set_highspeed(host->card); |
cd9277c0 | 880 | |
b855885e PO |
881 | host->ios.timing = MMC_TIMING_SD_HS; |
882 | mmc_set_ios(host); | |
7ccd266e | 883 | |
b855885e | 884 | out: |
7ccd266e | 885 | kfree(status); |
7ccd266e PO |
886 | } |
887 | ||
1da177e4 LT |
888 | static unsigned int mmc_calculate_clock(struct mmc_host *host) |
889 | { | |
1da177e4 LT |
890 | unsigned int max_dtr = host->f_max; |
891 | ||
b855885e PO |
892 | if (host->card && !mmc_card_dead(host->card)) { |
893 | if (mmc_card_highspeed(host->card) && mmc_card_sd(host->card)) { | |
894 | if (max_dtr > host->card->sw_caps.hs_max_dtr) | |
895 | max_dtr = host->card->sw_caps.hs_max_dtr; | |
896 | } else if (mmc_card_highspeed(host->card) && !mmc_card_sd(host->card)) { | |
897 | if (max_dtr > host->card->ext_csd.hs_max_dtr) | |
898 | max_dtr = host->card->ext_csd.hs_max_dtr; | |
899 | } else if (max_dtr > host->card->csd.max_dtr) { | |
900 | max_dtr = host->card->csd.max_dtr; | |
bce40a36 | 901 | } |
b855885e | 902 | } |
1da177e4 | 903 | |
920e70c5 RK |
904 | pr_debug("%s: selected %d.%03dMHz transfer rate\n", |
905 | mmc_hostname(host), | |
c6563178 | 906 | max_dtr / 1000000, (max_dtr / 1000) % 1000); |
1da177e4 LT |
907 | |
908 | return max_dtr; | |
909 | } | |
910 | ||
911 | /* | |
912 | * Check whether cards we already know about are still present. | |
913 | * We do this by requesting status, and checking whether a card | |
914 | * responds. | |
915 | * | |
916 | * A request for status does not cause a state change in data | |
917 | * transfer mode. | |
918 | */ | |
b855885e | 919 | static void mmc_check_card(struct mmc_card *card) |
1da177e4 | 920 | { |
b855885e | 921 | int err; |
1da177e4 | 922 | |
b855885e | 923 | BUG_ON(!card); |
1da177e4 | 924 | |
da7fbe58 | 925 | err = mmc_send_status(card, NULL); |
b855885e PO |
926 | if (err == MMC_ERR_NONE) |
927 | return; | |
1da177e4 | 928 | |
b855885e | 929 | mmc_card_set_dead(card); |
1da177e4 LT |
930 | } |
931 | ||
932 | static void mmc_setup(struct mmc_host *host) | |
933 | { | |
b855885e PO |
934 | int err; |
935 | u32 ocr; | |
1da177e4 | 936 | |
b855885e | 937 | host->mode = MMC_MODE_SD; |
335eadf2 | 938 | |
b855885e | 939 | mmc_power_up(host); |
da7fbe58 | 940 | mmc_go_idle(host); |
1da177e4 | 941 | |
da7fbe58 | 942 | err = mmc_send_if_cond(host, host->ocr_avail); |
b855885e PO |
943 | if (err != MMC_ERR_NONE) { |
944 | return; | |
945 | } | |
946 | err = mmc_send_app_op_cond(host, 0, &ocr); | |
1da177e4 | 947 | |
b855885e PO |
948 | /* |
949 | * If we fail to detect any SD cards then try | |
950 | * searching for MMC cards. | |
951 | */ | |
952 | if (err != MMC_ERR_NONE) { | |
953 | host->mode = MMC_MODE_MMC; | |
1da177e4 | 954 | |
b855885e PO |
955 | err = mmc_send_op_cond(host, 0, &ocr); |
956 | if (err != MMC_ERR_NONE) | |
957 | return; | |
1da177e4 LT |
958 | } |
959 | ||
b855885e PO |
960 | host->ocr = mmc_select_voltage(host, ocr); |
961 | ||
1da177e4 LT |
962 | if (host->ocr == 0) |
963 | return; | |
964 | ||
b855885e PO |
965 | /* |
966 | * Since we're changing the OCR value, we seem to | |
967 | * need to tell some cards to go back to the idle | |
968 | * state. We wait 1ms to give cards time to | |
969 | * respond. | |
970 | */ | |
da7fbe58 | 971 | mmc_go_idle(host); |
b855885e | 972 | |
1da177e4 LT |
973 | /* |
974 | * Send the selected OCR multiple times... until the cards | |
975 | * all get the idea that they should be ready for CMD2. | |
976 | * (My SanDisk card seems to need this.) | |
977 | */ | |
fba68bd2 | 978 | if (host->mode == MMC_MODE_SD) { |
da7fbe58 PO |
979 | /* |
980 | * If SD_SEND_IF_COND indicates an SD 2.0 | |
981 | * compliant card and we should set bit 30 | |
982 | * of the ocr to indicate that we can handle | |
983 | * block-addressed SDHC cards. | |
984 | */ | |
985 | err = mmc_send_if_cond(host, host->ocr); | |
986 | if (err == MMC_ERR_NONE) | |
987 | ocr = host->ocr | (1 << 30); | |
988 | ||
989 | mmc_send_app_op_cond(host, ocr, NULL); | |
fba68bd2 | 990 | } else { |
85a18ad9 PO |
991 | /* The extra bit indicates that we support high capacity */ |
992 | mmc_send_op_cond(host, host->ocr | (1 << 30), NULL); | |
fba68bd2 | 993 | } |
1da177e4 | 994 | |
b855885e | 995 | mmc_discover_card(host); |
1da177e4 LT |
996 | |
997 | /* | |
998 | * Ok, now switch to push-pull mode. | |
999 | */ | |
1000 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
920e70c5 | 1001 | mmc_set_ios(host); |
1da177e4 | 1002 | |
b855885e PO |
1003 | mmc_read_csd(host); |
1004 | ||
1005 | if (host->card && !mmc_card_dead(host->card)) { | |
1006 | err = mmc_select_card(host->card); | |
1007 | if (err != MMC_ERR_NONE) | |
1008 | mmc_card_set_dead(host->card); | |
1009 | } | |
b57c43ad | 1010 | |
da7fbe58 PO |
1011 | /* |
1012 | * The card is in 1 bit mode by default so | |
1013 | * we only need to change if it supports the | |
1014 | * wider version. | |
1015 | */ | |
1016 | if (host->card && !mmc_card_dead(host->card) && | |
1017 | mmc_card_sd(host->card) && | |
1018 | (host->card->scr.bus_widths & SD_SCR_BUS_WIDTH_4) && | |
1019 | (host->card->host->caps & MMC_CAP_4_BIT_DATA)) { | |
1020 | err = mmc_app_set_bus_width(host->card, SD_BUS_WIDTH_4); | |
1021 | if (err != MMC_ERR_NONE) | |
1022 | mmc_card_set_dead(host->card); | |
1023 | else { | |
1024 | host->ios.bus_width = MMC_BUS_WIDTH_4; | |
1025 | mmc_set_ios(host); | |
1026 | } | |
1027 | } | |
1028 | ||
7ccd266e | 1029 | if (host->mode == MMC_MODE_SD) { |
b855885e | 1030 | mmc_read_scr(host); |
7ccd266e PO |
1031 | mmc_read_switch_caps(host); |
1032 | } else | |
b855885e | 1033 | mmc_process_ext_csd(host); |
1da177e4 LT |
1034 | } |
1035 | ||
1036 | ||
1037 | /** | |
1038 | * mmc_detect_change - process change of state on a MMC socket | |
1039 | * @host: host which changed state. | |
8dc00335 | 1040 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 LT |
1041 | * |
1042 | * All we know is that card(s) have been inserted or removed | |
1043 | * from the socket(s). We don't know which socket or cards. | |
1044 | */ | |
8dc00335 | 1045 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 1046 | { |
3b91e550 PO |
1047 | #ifdef CONFIG_MMC_DEBUG |
1048 | mmc_claim_host(host); | |
1049 | BUG_ON(host->removed); | |
1050 | mmc_release_host(host); | |
1051 | #endif | |
1052 | ||
c4028958 | 1053 | mmc_schedule_delayed_work(&host->detect, delay); |
1da177e4 LT |
1054 | } |
1055 | ||
1056 | EXPORT_SYMBOL(mmc_detect_change); | |
1057 | ||
1058 | ||
c4028958 | 1059 | static void mmc_rescan(struct work_struct *work) |
1da177e4 | 1060 | { |
c4028958 DH |
1061 | struct mmc_host *host = |
1062 | container_of(work, struct mmc_host, detect.work); | |
1da177e4 LT |
1063 | |
1064 | mmc_claim_host(host); | |
1065 | ||
25a122fd | 1066 | /* |
b855885e | 1067 | * Check for removed card and newly inserted ones. We check for |
25a122fd TT |
1068 | * removed cards first so we can intelligently re-select the VDD. |
1069 | */ | |
b855885e PO |
1070 | if (host->card) { |
1071 | mmc_check_card(host->card); | |
1da177e4 | 1072 | |
b855885e | 1073 | mmc_release_host(host); |
1da177e4 | 1074 | |
b855885e PO |
1075 | if (mmc_card_dead(host->card)) { |
1076 | mmc_remove_card(host->card); | |
1077 | host->card = NULL; | |
1078 | } | |
1079 | ||
1080 | goto out; | |
1081 | } | |
25a122fd | 1082 | |
b855885e PO |
1083 | mmc_setup(host); |
1084 | ||
1085 | if (host->card && !mmc_card_dead(host->card)) { | |
1da177e4 LT |
1086 | /* |
1087 | * (Re-)calculate the fastest clock rate which the | |
1088 | * attached cards and the host support. | |
1089 | */ | |
1090 | host->ios.clock = mmc_calculate_clock(host); | |
920e70c5 | 1091 | mmc_set_ios(host); |
1da177e4 LT |
1092 | } |
1093 | ||
1094 | mmc_release_host(host); | |
1095 | ||
b855885e PO |
1096 | /* |
1097 | * If this is a new and good card, register it. | |
1098 | */ | |
1099 | if (host->card && !mmc_card_dead(host->card)) { | |
1100 | if (mmc_register_card(host->card)) | |
1101 | mmc_card_set_dead(host->card); | |
1102 | } | |
1da177e4 | 1103 | |
b855885e PO |
1104 | /* |
1105 | * If this card is dead, destroy it. | |
1106 | */ | |
1107 | if (host->card && mmc_card_dead(host->card)) { | |
1108 | mmc_remove_card(host->card); | |
1109 | host->card = NULL; | |
1da177e4 LT |
1110 | } |
1111 | ||
b855885e | 1112 | out: |
1da177e4 LT |
1113 | /* |
1114 | * If we discover that there are no cards on the | |
1115 | * bus, turn off the clock and power down. | |
1116 | */ | |
b855885e | 1117 | if (!host->card) |
1da177e4 LT |
1118 | mmc_power_off(host); |
1119 | } | |
1120 | ||
1121 | ||
1122 | /** | |
1123 | * mmc_alloc_host - initialise the per-host structure. | |
1124 | * @extra: sizeof private data structure | |
1125 | * @dev: pointer to host device model structure | |
1126 | * | |
1127 | * Initialise the per-host structure. | |
1128 | */ | |
1129 | struct mmc_host *mmc_alloc_host(int extra, struct device *dev) | |
1130 | { | |
1131 | struct mmc_host *host; | |
1132 | ||
00b137cf | 1133 | host = mmc_alloc_host_sysfs(extra, dev); |
1da177e4 | 1134 | if (host) { |
1da177e4 LT |
1135 | spin_lock_init(&host->lock); |
1136 | init_waitqueue_head(&host->wq); | |
c4028958 | 1137 | INIT_DELAYED_WORK(&host->detect, mmc_rescan); |
1da177e4 | 1138 | |
1da177e4 LT |
1139 | /* |
1140 | * By default, hosts do not support SGIO or large requests. | |
1141 | * They have to set these according to their abilities. | |
1142 | */ | |
1143 | host->max_hw_segs = 1; | |
1144 | host->max_phys_segs = 1; | |
1da177e4 | 1145 | host->max_seg_size = PAGE_CACHE_SIZE; |
fe4a3c7a | 1146 | |
55db890a | 1147 | host->max_req_size = PAGE_CACHE_SIZE; |
fe4a3c7a | 1148 | host->max_blk_size = 512; |
55db890a | 1149 | host->max_blk_count = PAGE_CACHE_SIZE / 512; |
1da177e4 LT |
1150 | } |
1151 | ||
1152 | return host; | |
1153 | } | |
1154 | ||
1155 | EXPORT_SYMBOL(mmc_alloc_host); | |
1156 | ||
1157 | /** | |
1158 | * mmc_add_host - initialise host hardware | |
1159 | * @host: mmc host | |
1160 | */ | |
1161 | int mmc_add_host(struct mmc_host *host) | |
1162 | { | |
00b137cf | 1163 | int ret; |
1da177e4 | 1164 | |
00b137cf RK |
1165 | ret = mmc_add_host_sysfs(host); |
1166 | if (ret == 0) { | |
1167 | mmc_power_off(host); | |
8dc00335 | 1168 | mmc_detect_change(host, 0); |
00b137cf | 1169 | } |
1da177e4 | 1170 | |
00b137cf | 1171 | return ret; |
1da177e4 LT |
1172 | } |
1173 | ||
1174 | EXPORT_SYMBOL(mmc_add_host); | |
1175 | ||
1176 | /** | |
1177 | * mmc_remove_host - remove host hardware | |
1178 | * @host: mmc host | |
1179 | * | |
1180 | * Unregister and remove all cards associated with this host, | |
1181 | * and power down the MMC bus. | |
1182 | */ | |
1183 | void mmc_remove_host(struct mmc_host *host) | |
1184 | { | |
3b91e550 PO |
1185 | #ifdef CONFIG_MMC_DEBUG |
1186 | mmc_claim_host(host); | |
1187 | host->removed = 1; | |
1188 | mmc_release_host(host); | |
1189 | #endif | |
1190 | ||
1191 | mmc_flush_scheduled_work(); | |
1192 | ||
b855885e PO |
1193 | if (host->card) { |
1194 | mmc_remove_card(host->card); | |
1195 | host->card = NULL; | |
1da177e4 LT |
1196 | } |
1197 | ||
1198 | mmc_power_off(host); | |
00b137cf | 1199 | mmc_remove_host_sysfs(host); |
1da177e4 LT |
1200 | } |
1201 | ||
1202 | EXPORT_SYMBOL(mmc_remove_host); | |
1203 | ||
1204 | /** | |
1205 | * mmc_free_host - free the host structure | |
1206 | * @host: mmc host | |
1207 | * | |
1208 | * Free the host once all references to it have been dropped. | |
1209 | */ | |
1210 | void mmc_free_host(struct mmc_host *host) | |
1211 | { | |
00b137cf | 1212 | mmc_free_host_sysfs(host); |
1da177e4 LT |
1213 | } |
1214 | ||
1215 | EXPORT_SYMBOL(mmc_free_host); | |
1216 | ||
1217 | #ifdef CONFIG_PM | |
1218 | ||
1219 | /** | |
1220 | * mmc_suspend_host - suspend a host | |
1221 | * @host: mmc host | |
1222 | * @state: suspend mode (PM_SUSPEND_xxx) | |
1223 | */ | |
e5378ca8 | 1224 | int mmc_suspend_host(struct mmc_host *host, pm_message_t state) |
1da177e4 | 1225 | { |
b5af25be PO |
1226 | mmc_flush_scheduled_work(); |
1227 | ||
b855885e PO |
1228 | if (host->card) { |
1229 | mmc_remove_card(host->card); | |
1230 | host->card = NULL; | |
b5af25be PO |
1231 | } |
1232 | ||
1da177e4 | 1233 | mmc_power_off(host); |
1da177e4 LT |
1234 | |
1235 | return 0; | |
1236 | } | |
1237 | ||
1238 | EXPORT_SYMBOL(mmc_suspend_host); | |
1239 | ||
1240 | /** | |
1241 | * mmc_resume_host - resume a previously suspended host | |
1242 | * @host: mmc host | |
1243 | */ | |
1244 | int mmc_resume_host(struct mmc_host *host) | |
1245 | { | |
c4028958 | 1246 | mmc_rescan(&host->detect.work); |
1da177e4 LT |
1247 | |
1248 | return 0; | |
1249 | } | |
1250 | ||
1251 | EXPORT_SYMBOL(mmc_resume_host); | |
1252 | ||
1253 | #endif | |
1254 | ||
1255 | MODULE_LICENSE("GPL"); |