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1da177e4 LT |
1 | /* |
2 | * linux/drivers/mmc/mmc.c | |
3 | * | |
4 | * Copyright (C) 2003-2004 Russell King, All Rights Reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/config.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/interrupt.h> | |
14 | #include <linux/completion.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/delay.h> | |
17 | #include <linux/pagemap.h> | |
18 | #include <linux/err.h> | |
b57c43ad PO |
19 | #include <asm/scatterlist.h> |
20 | #include <linux/scatterlist.h> | |
1da177e4 LT |
21 | |
22 | #include <linux/mmc/card.h> | |
23 | #include <linux/mmc/host.h> | |
24 | #include <linux/mmc/protocol.h> | |
25 | ||
26 | #include "mmc.h" | |
27 | ||
28 | #ifdef CONFIG_MMC_DEBUG | |
29 | #define DBG(x...) printk(KERN_DEBUG x) | |
30 | #else | |
31 | #define DBG(x...) do { } while (0) | |
32 | #endif | |
33 | ||
34 | #define CMD_RETRIES 3 | |
35 | ||
36 | /* | |
37 | * OCR Bit positions to 10s of Vdd mV. | |
38 | */ | |
39 | static const unsigned short mmc_ocr_bit_to_vdd[] = { | |
40 | 150, 155, 160, 165, 170, 180, 190, 200, | |
41 | 210, 220, 230, 240, 250, 260, 270, 280, | |
42 | 290, 300, 310, 320, 330, 340, 350, 360 | |
43 | }; | |
44 | ||
45 | static const unsigned int tran_exp[] = { | |
46 | 10000, 100000, 1000000, 10000000, | |
47 | 0, 0, 0, 0 | |
48 | }; | |
49 | ||
50 | static const unsigned char tran_mant[] = { | |
51 | 0, 10, 12, 13, 15, 20, 25, 30, | |
52 | 35, 40, 45, 50, 55, 60, 70, 80, | |
53 | }; | |
54 | ||
55 | static const unsigned int tacc_exp[] = { | |
56 | 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, | |
57 | }; | |
58 | ||
59 | static const unsigned int tacc_mant[] = { | |
60 | 0, 10, 12, 13, 15, 20, 25, 30, | |
61 | 35, 40, 45, 50, 55, 60, 70, 80, | |
62 | }; | |
63 | ||
64 | ||
65 | /** | |
66 | * mmc_request_done - finish processing an MMC command | |
67 | * @host: MMC host which completed command | |
68 | * @mrq: MMC request which completed | |
69 | * | |
70 | * MMC drivers should call this function when they have completed | |
71 | * their processing of a command. This should be called before the | |
72 | * data part of the command has completed. | |
73 | */ | |
74 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
75 | { | |
76 | struct mmc_command *cmd = mrq->cmd; | |
77 | int err = mrq->cmd->error; | |
78 | DBG("MMC: req done (%02x): %d: %08x %08x %08x %08x\n", cmd->opcode, | |
79 | err, cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]); | |
80 | ||
81 | if (err && cmd->retries) { | |
82 | cmd->retries--; | |
83 | cmd->error = 0; | |
84 | host->ops->request(host, mrq); | |
85 | } else if (mrq->done) { | |
86 | mrq->done(mrq); | |
87 | } | |
88 | } | |
89 | ||
90 | EXPORT_SYMBOL(mmc_request_done); | |
91 | ||
92 | /** | |
93 | * mmc_start_request - start a command on a host | |
94 | * @host: MMC host to start command on | |
95 | * @mrq: MMC request to start | |
96 | * | |
97 | * Queue a command on the specified host. We expect the | |
98 | * caller to be holding the host lock with interrupts disabled. | |
99 | */ | |
100 | void | |
101 | mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) | |
102 | { | |
103 | DBG("MMC: starting cmd %02x arg %08x flags %08x\n", | |
104 | mrq->cmd->opcode, mrq->cmd->arg, mrq->cmd->flags); | |
105 | ||
106 | WARN_ON(host->card_busy == NULL); | |
107 | ||
108 | mrq->cmd->error = 0; | |
109 | mrq->cmd->mrq = mrq; | |
110 | if (mrq->data) { | |
111 | mrq->cmd->data = mrq->data; | |
112 | mrq->data->error = 0; | |
113 | mrq->data->mrq = mrq; | |
114 | if (mrq->stop) { | |
115 | mrq->data->stop = mrq->stop; | |
116 | mrq->stop->error = 0; | |
117 | mrq->stop->mrq = mrq; | |
118 | } | |
119 | } | |
120 | host->ops->request(host, mrq); | |
121 | } | |
122 | ||
123 | EXPORT_SYMBOL(mmc_start_request); | |
124 | ||
125 | static void mmc_wait_done(struct mmc_request *mrq) | |
126 | { | |
127 | complete(mrq->done_data); | |
128 | } | |
129 | ||
130 | int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
131 | { | |
132 | DECLARE_COMPLETION(complete); | |
133 | ||
134 | mrq->done_data = &complete; | |
135 | mrq->done = mmc_wait_done; | |
136 | ||
137 | mmc_start_request(host, mrq); | |
138 | ||
139 | wait_for_completion(&complete); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | EXPORT_SYMBOL(mmc_wait_for_req); | |
145 | ||
146 | /** | |
147 | * mmc_wait_for_cmd - start a command and wait for completion | |
148 | * @host: MMC host to start command | |
149 | * @cmd: MMC command to start | |
150 | * @retries: maximum number of retries | |
151 | * | |
152 | * Start a new MMC command for a host, and wait for the command | |
153 | * to complete. Return any error that occurred while the command | |
154 | * was executing. Do not attempt to parse the response. | |
155 | */ | |
156 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
157 | { | |
158 | struct mmc_request mrq; | |
159 | ||
160 | BUG_ON(host->card_busy == NULL); | |
161 | ||
162 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
163 | ||
164 | memset(cmd->resp, 0, sizeof(cmd->resp)); | |
165 | cmd->retries = retries; | |
166 | ||
167 | mrq.cmd = cmd; | |
168 | cmd->data = NULL; | |
169 | ||
170 | mmc_wait_for_req(host, &mrq); | |
171 | ||
172 | return cmd->error; | |
173 | } | |
174 | ||
175 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
176 | ||
335eadf2 PO |
177 | /** |
178 | * mmc_wait_for_app_cmd - start an application command and wait for | |
179 | completion | |
180 | * @host: MMC host to start command | |
181 | * @rca: RCA to send MMC_APP_CMD to | |
182 | * @cmd: MMC command to start | |
183 | * @retries: maximum number of retries | |
184 | * | |
185 | * Sends a MMC_APP_CMD, checks the card response, sends the command | |
186 | * in the parameter and waits for it to complete. Return any error | |
187 | * that occurred while the command was executing. Do not attempt to | |
188 | * parse the response. | |
189 | */ | |
190 | int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca, | |
191 | struct mmc_command *cmd, int retries) | |
192 | { | |
193 | struct mmc_request mrq; | |
194 | struct mmc_command appcmd; | |
195 | ||
196 | int i, err; | |
197 | ||
198 | BUG_ON(host->card_busy == NULL); | |
199 | BUG_ON(retries < 0); | |
200 | ||
201 | err = MMC_ERR_INVALID; | |
202 | ||
203 | /* | |
204 | * We have to resend MMC_APP_CMD for each attempt so | |
205 | * we cannot use the retries field in mmc_command. | |
206 | */ | |
207 | for (i = 0;i <= retries;i++) { | |
208 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
209 | ||
210 | appcmd.opcode = MMC_APP_CMD; | |
211 | appcmd.arg = rca << 16; | |
212 | appcmd.flags = MMC_RSP_R1; | |
213 | appcmd.retries = 0; | |
214 | memset(appcmd.resp, 0, sizeof(appcmd.resp)); | |
215 | appcmd.data = NULL; | |
216 | ||
217 | mrq.cmd = &appcmd; | |
218 | appcmd.data = NULL; | |
219 | ||
220 | mmc_wait_for_req(host, &mrq); | |
221 | ||
222 | if (appcmd.error) { | |
223 | err = appcmd.error; | |
224 | continue; | |
225 | } | |
226 | ||
227 | /* Check that card supported application commands */ | |
228 | if (!(appcmd.resp[0] & R1_APP_CMD)) | |
229 | return MMC_ERR_FAILED; | |
230 | ||
231 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
232 | ||
233 | memset(cmd->resp, 0, sizeof(cmd->resp)); | |
234 | cmd->retries = 0; | |
235 | ||
236 | mrq.cmd = cmd; | |
237 | cmd->data = NULL; | |
1da177e4 | 238 | |
335eadf2 PO |
239 | mmc_wait_for_req(host, &mrq); |
240 | ||
241 | err = cmd->error; | |
242 | if (cmd->error == MMC_ERR_NONE) | |
243 | break; | |
244 | } | |
245 | ||
246 | return err; | |
247 | } | |
248 | ||
249 | EXPORT_SYMBOL(mmc_wait_for_app_cmd); | |
1da177e4 | 250 | |
b57c43ad PO |
251 | static int mmc_select_card(struct mmc_host *host, struct mmc_card *card); |
252 | ||
1da177e4 LT |
253 | /** |
254 | * __mmc_claim_host - exclusively claim a host | |
255 | * @host: mmc host to claim | |
256 | * @card: mmc card to claim host for | |
257 | * | |
258 | * Claim a host for a set of operations. If a valid card | |
259 | * is passed and this wasn't the last card selected, select | |
260 | * the card before returning. | |
261 | * | |
262 | * Note: you should use mmc_card_claim_host or mmc_claim_host. | |
263 | */ | |
264 | int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card) | |
265 | { | |
266 | DECLARE_WAITQUEUE(wait, current); | |
267 | unsigned long flags; | |
268 | int err = 0; | |
269 | ||
270 | add_wait_queue(&host->wq, &wait); | |
271 | spin_lock_irqsave(&host->lock, flags); | |
272 | while (1) { | |
273 | set_current_state(TASK_UNINTERRUPTIBLE); | |
274 | if (host->card_busy == NULL) | |
275 | break; | |
276 | spin_unlock_irqrestore(&host->lock, flags); | |
277 | schedule(); | |
278 | spin_lock_irqsave(&host->lock, flags); | |
279 | } | |
280 | set_current_state(TASK_RUNNING); | |
281 | host->card_busy = card; | |
282 | spin_unlock_irqrestore(&host->lock, flags); | |
283 | remove_wait_queue(&host->wq, &wait); | |
284 | ||
b57c43ad PO |
285 | if (card != (void *)-1) { |
286 | err = mmc_select_card(host, card); | |
287 | if (err != MMC_ERR_NONE) | |
288 | return err; | |
1da177e4 LT |
289 | } |
290 | ||
291 | return err; | |
292 | } | |
293 | ||
294 | EXPORT_SYMBOL(__mmc_claim_host); | |
295 | ||
296 | /** | |
297 | * mmc_release_host - release a host | |
298 | * @host: mmc host to release | |
299 | * | |
300 | * Release a MMC host, allowing others to claim the host | |
301 | * for their operations. | |
302 | */ | |
303 | void mmc_release_host(struct mmc_host *host) | |
304 | { | |
305 | unsigned long flags; | |
306 | ||
307 | BUG_ON(host->card_busy == NULL); | |
308 | ||
309 | spin_lock_irqsave(&host->lock, flags); | |
310 | host->card_busy = NULL; | |
311 | spin_unlock_irqrestore(&host->lock, flags); | |
312 | ||
313 | wake_up(&host->wq); | |
314 | } | |
315 | ||
316 | EXPORT_SYMBOL(mmc_release_host); | |
317 | ||
b57c43ad PO |
318 | static int mmc_select_card(struct mmc_host *host, struct mmc_card *card) |
319 | { | |
320 | int err; | |
321 | struct mmc_command cmd; | |
322 | ||
323 | BUG_ON(host->card_busy == NULL); | |
324 | ||
325 | if (host->card_selected == card) | |
326 | return MMC_ERR_NONE; | |
327 | ||
328 | host->card_selected = card; | |
329 | ||
330 | cmd.opcode = MMC_SELECT_CARD; | |
331 | cmd.arg = card->rca << 16; | |
332 | cmd.flags = MMC_RSP_R1; | |
333 | ||
334 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
335 | if (err != MMC_ERR_NONE) | |
336 | return err; | |
337 | ||
338 | return MMC_ERR_NONE; | |
339 | } | |
340 | ||
1da177e4 LT |
341 | /* |
342 | * Ensure that no card is selected. | |
343 | */ | |
344 | static void mmc_deselect_cards(struct mmc_host *host) | |
345 | { | |
346 | struct mmc_command cmd; | |
347 | ||
348 | if (host->card_selected) { | |
349 | host->card_selected = NULL; | |
350 | ||
351 | cmd.opcode = MMC_SELECT_CARD; | |
352 | cmd.arg = 0; | |
353 | cmd.flags = MMC_RSP_NONE; | |
354 | ||
355 | mmc_wait_for_cmd(host, &cmd, 0); | |
356 | } | |
357 | } | |
358 | ||
359 | ||
360 | static inline void mmc_delay(unsigned int ms) | |
361 | { | |
362 | if (ms < HZ / 1000) { | |
363 | yield(); | |
364 | mdelay(ms); | |
365 | } else { | |
366 | msleep_interruptible (ms); | |
367 | } | |
368 | } | |
369 | ||
370 | /* | |
371 | * Mask off any voltages we don't support and select | |
372 | * the lowest voltage | |
373 | */ | |
374 | static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) | |
375 | { | |
376 | int bit; | |
377 | ||
378 | ocr &= host->ocr_avail; | |
379 | ||
380 | bit = ffs(ocr); | |
381 | if (bit) { | |
382 | bit -= 1; | |
383 | ||
384 | ocr = 3 << bit; | |
385 | ||
386 | host->ios.vdd = bit; | |
387 | host->ops->set_ios(host, &host->ios); | |
388 | } else { | |
389 | ocr = 0; | |
390 | } | |
391 | ||
392 | return ocr; | |
393 | } | |
394 | ||
395 | #define UNSTUFF_BITS(resp,start,size) \ | |
396 | ({ \ | |
397 | const int __size = size; \ | |
398 | const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ | |
399 | const int __off = 3 - ((start) / 32); \ | |
400 | const int __shft = (start) & 31; \ | |
401 | u32 __res; \ | |
402 | \ | |
403 | __res = resp[__off] >> __shft; \ | |
404 | if (__size + __shft > 32) \ | |
405 | __res |= resp[__off-1] << ((32 - __shft) % 32); \ | |
406 | __res & __mask; \ | |
407 | }) | |
408 | ||
409 | /* | |
410 | * Given the decoded CSD structure, decode the raw CID to our CID structure. | |
411 | */ | |
412 | static void mmc_decode_cid(struct mmc_card *card) | |
413 | { | |
414 | u32 *resp = card->raw_cid; | |
415 | ||
416 | memset(&card->cid, 0, sizeof(struct mmc_cid)); | |
417 | ||
335eadf2 PO |
418 | if (mmc_card_sd(card)) { |
419 | /* | |
420 | * SD doesn't currently have a version field so we will | |
421 | * have to assume we can parse this. | |
422 | */ | |
423 | card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); | |
424 | card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); | |
425 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
426 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
427 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
428 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
429 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
430 | card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); | |
431 | card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); | |
432 | card->cid.serial = UNSTUFF_BITS(resp, 24, 32); | |
433 | card->cid.year = UNSTUFF_BITS(resp, 12, 8); | |
434 | card->cid.month = UNSTUFF_BITS(resp, 8, 4); | |
435 | ||
436 | card->cid.year += 2000; /* SD cards year offset */ | |
a00fc090 | 437 | } else { |
335eadf2 PO |
438 | /* |
439 | * The selection of the format here is based upon published | |
440 | * specs from sandisk and from what people have reported. | |
441 | */ | |
442 | switch (card->csd.mmca_vsn) { | |
443 | case 0: /* MMC v1.0 - v1.2 */ | |
444 | case 1: /* MMC v1.4 */ | |
445 | card->cid.manfid = UNSTUFF_BITS(resp, 104, 24); | |
446 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
447 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
448 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
449 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
450 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
451 | card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); | |
452 | card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8); | |
453 | card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4); | |
454 | card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4); | |
455 | card->cid.serial = UNSTUFF_BITS(resp, 16, 24); | |
456 | card->cid.month = UNSTUFF_BITS(resp, 12, 4); | |
457 | card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; | |
458 | break; | |
459 | ||
460 | case 2: /* MMC v2.0 - v2.2 */ | |
461 | case 3: /* MMC v3.1 - v3.3 */ | |
462 | card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); | |
463 | card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); | |
464 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
465 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
466 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
467 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
468 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
469 | card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); | |
470 | card->cid.serial = UNSTUFF_BITS(resp, 16, 32); | |
471 | card->cid.month = UNSTUFF_BITS(resp, 12, 4); | |
472 | card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; | |
473 | break; | |
474 | ||
475 | default: | |
476 | printk("%s: card has unknown MMCA version %d\n", | |
477 | mmc_hostname(card->host), card->csd.mmca_vsn); | |
478 | mmc_card_set_bad(card); | |
479 | break; | |
480 | } | |
1da177e4 LT |
481 | } |
482 | } | |
483 | ||
484 | /* | |
485 | * Given a 128-bit response, decode to our card CSD structure. | |
486 | */ | |
487 | static void mmc_decode_csd(struct mmc_card *card) | |
488 | { | |
489 | struct mmc_csd *csd = &card->csd; | |
490 | unsigned int e, m, csd_struct; | |
491 | u32 *resp = card->raw_csd; | |
492 | ||
335eadf2 PO |
493 | if (mmc_card_sd(card)) { |
494 | csd_struct = UNSTUFF_BITS(resp, 126, 2); | |
495 | if (csd_struct != 0) { | |
496 | printk("%s: unrecognised CSD structure version %d\n", | |
497 | mmc_hostname(card->host), csd_struct); | |
498 | mmc_card_set_bad(card); | |
499 | return; | |
500 | } | |
501 | ||
502 | m = UNSTUFF_BITS(resp, 115, 4); | |
503 | e = UNSTUFF_BITS(resp, 112, 3); | |
504 | csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; | |
505 | csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; | |
506 | ||
507 | m = UNSTUFF_BITS(resp, 99, 4); | |
508 | e = UNSTUFF_BITS(resp, 96, 3); | |
509 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
510 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
511 | ||
512 | e = UNSTUFF_BITS(resp, 47, 3); | |
513 | m = UNSTUFF_BITS(resp, 62, 12); | |
514 | csd->capacity = (1 + m) << (e + 2); | |
515 | ||
516 | csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); | |
a00fc090 | 517 | } else { |
335eadf2 PO |
518 | /* |
519 | * We only understand CSD structure v1.1 and v1.2. | |
520 | * v1.2 has extra information in bits 15, 11 and 10. | |
521 | */ | |
522 | csd_struct = UNSTUFF_BITS(resp, 126, 2); | |
523 | if (csd_struct != 1 && csd_struct != 2) { | |
524 | printk("%s: unrecognised CSD structure version %d\n", | |
525 | mmc_hostname(card->host), csd_struct); | |
526 | mmc_card_set_bad(card); | |
527 | return; | |
528 | } | |
1da177e4 | 529 | |
335eadf2 PO |
530 | csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4); |
531 | m = UNSTUFF_BITS(resp, 115, 4); | |
532 | e = UNSTUFF_BITS(resp, 112, 3); | |
533 | csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; | |
534 | csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; | |
1da177e4 | 535 | |
335eadf2 PO |
536 | m = UNSTUFF_BITS(resp, 99, 4); |
537 | e = UNSTUFF_BITS(resp, 96, 3); | |
538 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
539 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
1da177e4 | 540 | |
335eadf2 PO |
541 | e = UNSTUFF_BITS(resp, 47, 3); |
542 | m = UNSTUFF_BITS(resp, 62, 12); | |
543 | csd->capacity = (1 + m) << (e + 2); | |
1da177e4 | 544 | |
335eadf2 PO |
545 | csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); |
546 | } | |
1da177e4 LT |
547 | } |
548 | ||
b57c43ad PO |
549 | /* |
550 | * Given a 64-bit response, decode to our card SCR structure. | |
551 | */ | |
552 | static void mmc_decode_scr(struct mmc_card *card) | |
553 | { | |
554 | struct sd_scr *scr = &card->scr; | |
555 | unsigned int scr_struct; | |
556 | u32 resp[4]; | |
557 | ||
558 | BUG_ON(!mmc_card_sd(card)); | |
559 | ||
560 | resp[3] = card->raw_scr[1]; | |
561 | resp[2] = card->raw_scr[0]; | |
562 | ||
563 | scr_struct = UNSTUFF_BITS(resp, 60, 4); | |
564 | if (scr_struct != 0) { | |
565 | printk("%s: unrecognised SCR structure version %d\n", | |
566 | mmc_hostname(card->host), scr_struct); | |
567 | mmc_card_set_bad(card); | |
568 | return; | |
569 | } | |
570 | ||
571 | scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); | |
572 | scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); | |
573 | } | |
574 | ||
1da177e4 LT |
575 | /* |
576 | * Locate a MMC card on this MMC host given a raw CID. | |
577 | */ | |
578 | static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid) | |
579 | { | |
580 | struct mmc_card *card; | |
581 | ||
582 | list_for_each_entry(card, &host->cards, node) { | |
583 | if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0) | |
584 | return card; | |
585 | } | |
586 | return NULL; | |
587 | } | |
588 | ||
589 | /* | |
590 | * Allocate a new MMC card, and assign a unique RCA. | |
591 | */ | |
592 | static struct mmc_card * | |
593 | mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca) | |
594 | { | |
595 | struct mmc_card *card, *c; | |
596 | unsigned int rca = *frca; | |
597 | ||
598 | card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL); | |
599 | if (!card) | |
600 | return ERR_PTR(-ENOMEM); | |
601 | ||
602 | mmc_init_card(card, host); | |
603 | memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid)); | |
604 | ||
605 | again: | |
606 | list_for_each_entry(c, &host->cards, node) | |
607 | if (c->rca == rca) { | |
608 | rca++; | |
609 | goto again; | |
610 | } | |
611 | ||
612 | card->rca = rca; | |
613 | ||
614 | *frca = rca; | |
615 | ||
616 | return card; | |
617 | } | |
618 | ||
619 | /* | |
620 | * Tell attached cards to go to IDLE state | |
621 | */ | |
622 | static void mmc_idle_cards(struct mmc_host *host) | |
623 | { | |
624 | struct mmc_command cmd; | |
625 | ||
865e9f13 PO |
626 | host->ios.chip_select = MMC_CS_HIGH; |
627 | host->ops->set_ios(host, &host->ios); | |
628 | ||
629 | mmc_delay(1); | |
630 | ||
1da177e4 LT |
631 | cmd.opcode = MMC_GO_IDLE_STATE; |
632 | cmd.arg = 0; | |
633 | cmd.flags = MMC_RSP_NONE; | |
634 | ||
635 | mmc_wait_for_cmd(host, &cmd, 0); | |
636 | ||
637 | mmc_delay(1); | |
865e9f13 PO |
638 | |
639 | host->ios.chip_select = MMC_CS_DONTCARE; | |
640 | host->ops->set_ios(host, &host->ios); | |
641 | ||
642 | mmc_delay(1); | |
1da177e4 LT |
643 | } |
644 | ||
645 | /* | |
646 | * Apply power to the MMC stack. | |
647 | */ | |
648 | static void mmc_power_up(struct mmc_host *host) | |
649 | { | |
650 | int bit = fls(host->ocr_avail) - 1; | |
651 | ||
652 | host->ios.vdd = bit; | |
653 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
865e9f13 | 654 | host->ios.chip_select = MMC_CS_DONTCARE; |
1da177e4 LT |
655 | host->ios.power_mode = MMC_POWER_UP; |
656 | host->ops->set_ios(host, &host->ios); | |
657 | ||
658 | mmc_delay(1); | |
659 | ||
660 | host->ios.clock = host->f_min; | |
661 | host->ios.power_mode = MMC_POWER_ON; | |
662 | host->ops->set_ios(host, &host->ios); | |
663 | ||
664 | mmc_delay(2); | |
665 | } | |
666 | ||
667 | static void mmc_power_off(struct mmc_host *host) | |
668 | { | |
669 | host->ios.clock = 0; | |
670 | host->ios.vdd = 0; | |
671 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
865e9f13 | 672 | host->ios.chip_select = MMC_CS_DONTCARE; |
1da177e4 LT |
673 | host->ios.power_mode = MMC_POWER_OFF; |
674 | host->ops->set_ios(host, &host->ios); | |
675 | } | |
676 | ||
677 | static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) | |
678 | { | |
679 | struct mmc_command cmd; | |
680 | int i, err = 0; | |
681 | ||
682 | cmd.opcode = MMC_SEND_OP_COND; | |
683 | cmd.arg = ocr; | |
684 | cmd.flags = MMC_RSP_R3; | |
685 | ||
686 | for (i = 100; i; i--) { | |
687 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
688 | if (err != MMC_ERR_NONE) | |
689 | break; | |
690 | ||
691 | if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0) | |
692 | break; | |
693 | ||
694 | err = MMC_ERR_TIMEOUT; | |
695 | ||
696 | mmc_delay(10); | |
697 | } | |
698 | ||
699 | if (rocr) | |
700 | *rocr = cmd.resp[0]; | |
701 | ||
702 | return err; | |
703 | } | |
704 | ||
335eadf2 PO |
705 | static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) |
706 | { | |
707 | struct mmc_command cmd; | |
708 | int i, err = 0; | |
709 | ||
710 | cmd.opcode = SD_APP_OP_COND; | |
711 | cmd.arg = ocr; | |
712 | cmd.flags = MMC_RSP_R3; | |
713 | ||
714 | for (i = 100; i; i--) { | |
715 | err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES); | |
716 | if (err != MMC_ERR_NONE) | |
717 | break; | |
718 | ||
719 | if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0) | |
720 | break; | |
721 | ||
722 | err = MMC_ERR_TIMEOUT; | |
723 | ||
724 | mmc_delay(10); | |
725 | } | |
726 | ||
727 | if (rocr) | |
728 | *rocr = cmd.resp[0]; | |
729 | ||
730 | return err; | |
731 | } | |
732 | ||
1da177e4 LT |
733 | /* |
734 | * Discover cards by requesting their CID. If this command | |
735 | * times out, it is not an error; there are no further cards | |
736 | * to be discovered. Add new cards to the list. | |
737 | * | |
738 | * Create a mmc_card entry for each discovered card, assigning | |
739 | * it an RCA, and save the raw CID for decoding later. | |
740 | */ | |
741 | static void mmc_discover_cards(struct mmc_host *host) | |
742 | { | |
743 | struct mmc_card *card; | |
744 | unsigned int first_rca = 1, err; | |
745 | ||
746 | while (1) { | |
747 | struct mmc_command cmd; | |
748 | ||
749 | cmd.opcode = MMC_ALL_SEND_CID; | |
750 | cmd.arg = 0; | |
751 | cmd.flags = MMC_RSP_R2; | |
752 | ||
753 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
754 | if (err == MMC_ERR_TIMEOUT) { | |
755 | err = MMC_ERR_NONE; | |
756 | break; | |
757 | } | |
758 | if (err != MMC_ERR_NONE) { | |
759 | printk(KERN_ERR "%s: error requesting CID: %d\n", | |
d366b643 | 760 | mmc_hostname(host), err); |
1da177e4 LT |
761 | break; |
762 | } | |
763 | ||
764 | card = mmc_find_card(host, cmd.resp); | |
765 | if (!card) { | |
766 | card = mmc_alloc_card(host, cmd.resp, &first_rca); | |
767 | if (IS_ERR(card)) { | |
768 | err = PTR_ERR(card); | |
769 | break; | |
770 | } | |
771 | list_add(&card->node, &host->cards); | |
772 | } | |
773 | ||
774 | card->state &= ~MMC_STATE_DEAD; | |
775 | ||
335eadf2 PO |
776 | if (host->mode == MMC_MODE_SD) { |
777 | mmc_card_set_sd(card); | |
1da177e4 | 778 | |
335eadf2 PO |
779 | cmd.opcode = SD_SEND_RELATIVE_ADDR; |
780 | cmd.arg = 0; | |
781 | cmd.flags = MMC_RSP_R1; | |
782 | ||
783 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
784 | if (err != MMC_ERR_NONE) | |
785 | mmc_card_set_dead(card); | |
a00fc090 | 786 | else { |
335eadf2 | 787 | card->rca = cmd.resp[0] >> 16; |
a00fc090 PO |
788 | |
789 | if (!host->ops->get_ro) { | |
790 | printk(KERN_WARNING "%s: host does not " | |
791 | "support reading read-only " | |
792 | "switch. assuming write-enable.\n", | |
793 | mmc_hostname(host)); | |
794 | } else { | |
795 | if (host->ops->get_ro(host)) | |
796 | mmc_card_set_readonly(card); | |
797 | } | |
798 | } | |
799 | } else { | |
335eadf2 PO |
800 | cmd.opcode = MMC_SET_RELATIVE_ADDR; |
801 | cmd.arg = card->rca << 16; | |
802 | cmd.flags = MMC_RSP_R1; | |
803 | ||
804 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
805 | if (err != MMC_ERR_NONE) | |
806 | mmc_card_set_dead(card); | |
807 | } | |
1da177e4 LT |
808 | } |
809 | } | |
810 | ||
811 | static void mmc_read_csds(struct mmc_host *host) | |
812 | { | |
813 | struct mmc_card *card; | |
814 | ||
815 | list_for_each_entry(card, &host->cards, node) { | |
816 | struct mmc_command cmd; | |
817 | int err; | |
818 | ||
819 | if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) | |
820 | continue; | |
821 | ||
822 | cmd.opcode = MMC_SEND_CSD; | |
823 | cmd.arg = card->rca << 16; | |
824 | cmd.flags = MMC_RSP_R2; | |
825 | ||
826 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
827 | if (err != MMC_ERR_NONE) { | |
828 | mmc_card_set_dead(card); | |
829 | continue; | |
830 | } | |
831 | ||
832 | memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd)); | |
833 | ||
834 | mmc_decode_csd(card); | |
835 | mmc_decode_cid(card); | |
836 | } | |
837 | } | |
838 | ||
b57c43ad PO |
839 | static void mmc_read_scrs(struct mmc_host *host) |
840 | { | |
841 | int err; | |
842 | struct mmc_card *card; | |
843 | ||
844 | struct mmc_request mrq; | |
845 | struct mmc_command cmd; | |
846 | struct mmc_data data; | |
847 | ||
848 | struct scatterlist sg; | |
849 | ||
850 | list_for_each_entry(card, &host->cards, node) { | |
851 | if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) | |
852 | continue; | |
853 | if (!mmc_card_sd(card)) | |
854 | continue; | |
855 | ||
856 | err = mmc_select_card(host, card); | |
857 | if (err != MMC_ERR_NONE) { | |
858 | mmc_card_set_dead(card); | |
859 | continue; | |
860 | } | |
861 | ||
862 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
863 | ||
864 | cmd.opcode = MMC_APP_CMD; | |
865 | cmd.arg = card->rca << 16; | |
866 | cmd.flags = MMC_RSP_R1; | |
867 | ||
868 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
869 | if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) { | |
870 | mmc_card_set_dead(card); | |
871 | continue; | |
872 | } | |
873 | ||
874 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
875 | ||
876 | cmd.opcode = SD_APP_SEND_SCR; | |
877 | cmd.arg = 0; | |
878 | cmd.flags = MMC_RSP_R1; | |
879 | ||
880 | memset(&data, 0, sizeof(struct mmc_data)); | |
881 | ||
882 | data.timeout_ns = card->csd.tacc_ns * 10; | |
883 | data.timeout_clks = card->csd.tacc_clks * 10; | |
884 | data.blksz_bits = 3; | |
885 | data.blocks = 1; | |
886 | data.flags = MMC_DATA_READ; | |
887 | data.sg = &sg; | |
888 | data.sg_len = 1; | |
889 | ||
890 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
891 | ||
892 | mrq.cmd = &cmd; | |
893 | mrq.data = &data; | |
894 | ||
895 | sg_init_one(&sg, (u8*)card->raw_scr, 8); | |
896 | ||
897 | err = mmc_wait_for_req(host, &mrq); | |
898 | if (err != MMC_ERR_NONE) { | |
899 | mmc_card_set_dead(card); | |
900 | continue; | |
901 | } | |
902 | ||
903 | card->raw_scr[0] = ntohl(card->raw_scr[0]); | |
904 | card->raw_scr[1] = ntohl(card->raw_scr[1]); | |
905 | ||
906 | mmc_decode_scr(card); | |
907 | } | |
908 | ||
909 | mmc_deselect_cards(host); | |
910 | } | |
911 | ||
1da177e4 LT |
912 | static unsigned int mmc_calculate_clock(struct mmc_host *host) |
913 | { | |
914 | struct mmc_card *card; | |
915 | unsigned int max_dtr = host->f_max; | |
916 | ||
917 | list_for_each_entry(card, &host->cards, node) | |
918 | if (!mmc_card_dead(card) && max_dtr > card->csd.max_dtr) | |
919 | max_dtr = card->csd.max_dtr; | |
920 | ||
921 | DBG("MMC: selected %d.%03dMHz transfer rate\n", | |
922 | max_dtr / 1000000, (max_dtr / 1000) % 1000); | |
923 | ||
924 | return max_dtr; | |
925 | } | |
926 | ||
927 | /* | |
928 | * Check whether cards we already know about are still present. | |
929 | * We do this by requesting status, and checking whether a card | |
930 | * responds. | |
931 | * | |
932 | * A request for status does not cause a state change in data | |
933 | * transfer mode. | |
934 | */ | |
935 | static void mmc_check_cards(struct mmc_host *host) | |
936 | { | |
937 | struct list_head *l, *n; | |
938 | ||
939 | mmc_deselect_cards(host); | |
940 | ||
941 | list_for_each_safe(l, n, &host->cards) { | |
942 | struct mmc_card *card = mmc_list_to_card(l); | |
943 | struct mmc_command cmd; | |
944 | int err; | |
945 | ||
946 | cmd.opcode = MMC_SEND_STATUS; | |
947 | cmd.arg = card->rca << 16; | |
948 | cmd.flags = MMC_RSP_R1; | |
949 | ||
950 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
951 | if (err == MMC_ERR_NONE) | |
952 | continue; | |
953 | ||
954 | mmc_card_set_dead(card); | |
955 | } | |
956 | } | |
957 | ||
958 | static void mmc_setup(struct mmc_host *host) | |
959 | { | |
960 | if (host->ios.power_mode != MMC_POWER_ON) { | |
961 | int err; | |
962 | u32 ocr; | |
963 | ||
a00fc090 | 964 | host->mode = MMC_MODE_SD; |
335eadf2 | 965 | |
1da177e4 LT |
966 | mmc_power_up(host); |
967 | mmc_idle_cards(host); | |
968 | ||
a00fc090 | 969 | err = mmc_send_app_op_cond(host, 0, &ocr); |
335eadf2 PO |
970 | |
971 | /* | |
a00fc090 PO |
972 | * If we fail to detect any SD cards then try |
973 | * searching for MMC cards. | |
335eadf2 | 974 | */ |
a00fc090 PO |
975 | if (err != MMC_ERR_NONE) { |
976 | host->mode = MMC_MODE_MMC; | |
977 | ||
978 | err = mmc_send_op_cond(host, 0, &ocr); | |
335eadf2 PO |
979 | if (err != MMC_ERR_NONE) |
980 | return; | |
335eadf2 | 981 | } |
1da177e4 LT |
982 | |
983 | host->ocr = mmc_select_voltage(host, ocr); | |
984 | ||
985 | /* | |
986 | * Since we're changing the OCR value, we seem to | |
987 | * need to tell some cards to go back to the idle | |
988 | * state. We wait 1ms to give cards time to | |
989 | * respond. | |
990 | */ | |
991 | if (host->ocr) | |
992 | mmc_idle_cards(host); | |
993 | } else { | |
994 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
995 | host->ios.clock = host->f_min; | |
996 | host->ops->set_ios(host, &host->ios); | |
997 | ||
998 | /* | |
999 | * We should remember the OCR mask from the existing | |
1000 | * cards, and detect the new cards OCR mask, combine | |
1001 | * the two and re-select the VDD. However, if we do | |
1002 | * change VDD, we should do an idle, and then do a | |
1003 | * full re-initialisation. We would need to notify | |
1004 | * drivers so that they can re-setup the cards as | |
1005 | * well, while keeping their queues at bay. | |
1006 | * | |
1007 | * For the moment, we take the easy way out - if the | |
1008 | * new cards don't like our currently selected VDD, | |
1009 | * they drop off the bus. | |
1010 | */ | |
1011 | } | |
1012 | ||
1013 | if (host->ocr == 0) | |
1014 | return; | |
1015 | ||
1016 | /* | |
1017 | * Send the selected OCR multiple times... until the cards | |
1018 | * all get the idea that they should be ready for CMD2. | |
1019 | * (My SanDisk card seems to need this.) | |
1020 | */ | |
335eadf2 PO |
1021 | if (host->mode == MMC_MODE_SD) |
1022 | mmc_send_app_op_cond(host, host->ocr, NULL); | |
1023 | else | |
1024 | mmc_send_op_cond(host, host->ocr, NULL); | |
1da177e4 LT |
1025 | |
1026 | mmc_discover_cards(host); | |
1027 | ||
1028 | /* | |
1029 | * Ok, now switch to push-pull mode. | |
1030 | */ | |
1031 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
1032 | host->ops->set_ios(host, &host->ios); | |
1033 | ||
1034 | mmc_read_csds(host); | |
b57c43ad PO |
1035 | |
1036 | if (host->mode == MMC_MODE_SD) | |
1037 | mmc_read_scrs(host); | |
1da177e4 LT |
1038 | } |
1039 | ||
1040 | ||
1041 | /** | |
1042 | * mmc_detect_change - process change of state on a MMC socket | |
1043 | * @host: host which changed state. | |
1044 | * | |
1045 | * All we know is that card(s) have been inserted or removed | |
1046 | * from the socket(s). We don't know which socket or cards. | |
1047 | */ | |
1048 | void mmc_detect_change(struct mmc_host *host) | |
1049 | { | |
1050 | schedule_work(&host->detect); | |
1051 | } | |
1052 | ||
1053 | EXPORT_SYMBOL(mmc_detect_change); | |
1054 | ||
1055 | ||
1056 | static void mmc_rescan(void *data) | |
1057 | { | |
1058 | struct mmc_host *host = data; | |
1059 | struct list_head *l, *n; | |
1060 | ||
1061 | mmc_claim_host(host); | |
1062 | ||
1063 | if (host->ios.power_mode == MMC_POWER_ON) | |
1064 | mmc_check_cards(host); | |
1065 | ||
1066 | mmc_setup(host); | |
1067 | ||
1068 | if (!list_empty(&host->cards)) { | |
1069 | /* | |
1070 | * (Re-)calculate the fastest clock rate which the | |
1071 | * attached cards and the host support. | |
1072 | */ | |
1073 | host->ios.clock = mmc_calculate_clock(host); | |
1074 | host->ops->set_ios(host, &host->ios); | |
1075 | } | |
1076 | ||
1077 | mmc_release_host(host); | |
1078 | ||
1079 | list_for_each_safe(l, n, &host->cards) { | |
1080 | struct mmc_card *card = mmc_list_to_card(l); | |
1081 | ||
1082 | /* | |
1083 | * If this is a new and good card, register it. | |
1084 | */ | |
1085 | if (!mmc_card_present(card) && !mmc_card_dead(card)) { | |
1086 | if (mmc_register_card(card)) | |
1087 | mmc_card_set_dead(card); | |
1088 | else | |
1089 | mmc_card_set_present(card); | |
1090 | } | |
1091 | ||
1092 | /* | |
1093 | * If this card is dead, destroy it. | |
1094 | */ | |
1095 | if (mmc_card_dead(card)) { | |
1096 | list_del(&card->node); | |
1097 | mmc_remove_card(card); | |
1098 | } | |
1099 | } | |
1100 | ||
1101 | /* | |
1102 | * If we discover that there are no cards on the | |
1103 | * bus, turn off the clock and power down. | |
1104 | */ | |
1105 | if (list_empty(&host->cards)) | |
1106 | mmc_power_off(host); | |
1107 | } | |
1108 | ||
1109 | ||
1110 | /** | |
1111 | * mmc_alloc_host - initialise the per-host structure. | |
1112 | * @extra: sizeof private data structure | |
1113 | * @dev: pointer to host device model structure | |
1114 | * | |
1115 | * Initialise the per-host structure. | |
1116 | */ | |
1117 | struct mmc_host *mmc_alloc_host(int extra, struct device *dev) | |
1118 | { | |
1119 | struct mmc_host *host; | |
1120 | ||
00b137cf | 1121 | host = mmc_alloc_host_sysfs(extra, dev); |
1da177e4 | 1122 | if (host) { |
1da177e4 LT |
1123 | spin_lock_init(&host->lock); |
1124 | init_waitqueue_head(&host->wq); | |
1125 | INIT_LIST_HEAD(&host->cards); | |
1126 | INIT_WORK(&host->detect, mmc_rescan, host); | |
1127 | ||
1da177e4 LT |
1128 | /* |
1129 | * By default, hosts do not support SGIO or large requests. | |
1130 | * They have to set these according to their abilities. | |
1131 | */ | |
1132 | host->max_hw_segs = 1; | |
1133 | host->max_phys_segs = 1; | |
1134 | host->max_sectors = 1 << (PAGE_CACHE_SHIFT - 9); | |
1135 | host->max_seg_size = PAGE_CACHE_SIZE; | |
1136 | } | |
1137 | ||
1138 | return host; | |
1139 | } | |
1140 | ||
1141 | EXPORT_SYMBOL(mmc_alloc_host); | |
1142 | ||
1143 | /** | |
1144 | * mmc_add_host - initialise host hardware | |
1145 | * @host: mmc host | |
1146 | */ | |
1147 | int mmc_add_host(struct mmc_host *host) | |
1148 | { | |
00b137cf | 1149 | int ret; |
1da177e4 | 1150 | |
00b137cf RK |
1151 | ret = mmc_add_host_sysfs(host); |
1152 | if (ret == 0) { | |
1153 | mmc_power_off(host); | |
1154 | mmc_detect_change(host); | |
1155 | } | |
1da177e4 | 1156 | |
00b137cf | 1157 | return ret; |
1da177e4 LT |
1158 | } |
1159 | ||
1160 | EXPORT_SYMBOL(mmc_add_host); | |
1161 | ||
1162 | /** | |
1163 | * mmc_remove_host - remove host hardware | |
1164 | * @host: mmc host | |
1165 | * | |
1166 | * Unregister and remove all cards associated with this host, | |
1167 | * and power down the MMC bus. | |
1168 | */ | |
1169 | void mmc_remove_host(struct mmc_host *host) | |
1170 | { | |
1171 | struct list_head *l, *n; | |
1172 | ||
1173 | list_for_each_safe(l, n, &host->cards) { | |
1174 | struct mmc_card *card = mmc_list_to_card(l); | |
1175 | ||
1176 | mmc_remove_card(card); | |
1177 | } | |
1178 | ||
1179 | mmc_power_off(host); | |
00b137cf | 1180 | mmc_remove_host_sysfs(host); |
1da177e4 LT |
1181 | } |
1182 | ||
1183 | EXPORT_SYMBOL(mmc_remove_host); | |
1184 | ||
1185 | /** | |
1186 | * mmc_free_host - free the host structure | |
1187 | * @host: mmc host | |
1188 | * | |
1189 | * Free the host once all references to it have been dropped. | |
1190 | */ | |
1191 | void mmc_free_host(struct mmc_host *host) | |
1192 | { | |
1193 | flush_scheduled_work(); | |
00b137cf | 1194 | mmc_free_host_sysfs(host); |
1da177e4 LT |
1195 | } |
1196 | ||
1197 | EXPORT_SYMBOL(mmc_free_host); | |
1198 | ||
1199 | #ifdef CONFIG_PM | |
1200 | ||
1201 | /** | |
1202 | * mmc_suspend_host - suspend a host | |
1203 | * @host: mmc host | |
1204 | * @state: suspend mode (PM_SUSPEND_xxx) | |
1205 | */ | |
e5378ca8 | 1206 | int mmc_suspend_host(struct mmc_host *host, pm_message_t state) |
1da177e4 LT |
1207 | { |
1208 | mmc_claim_host(host); | |
1209 | mmc_deselect_cards(host); | |
1210 | mmc_power_off(host); | |
1211 | mmc_release_host(host); | |
1212 | ||
1213 | return 0; | |
1214 | } | |
1215 | ||
1216 | EXPORT_SYMBOL(mmc_suspend_host); | |
1217 | ||
1218 | /** | |
1219 | * mmc_resume_host - resume a previously suspended host | |
1220 | * @host: mmc host | |
1221 | */ | |
1222 | int mmc_resume_host(struct mmc_host *host) | |
1223 | { | |
1224 | mmc_detect_change(host); | |
1225 | ||
1226 | return 0; | |
1227 | } | |
1228 | ||
1229 | EXPORT_SYMBOL(mmc_resume_host); | |
1230 | ||
1231 | #endif | |
1232 | ||
1233 | MODULE_LICENSE("GPL"); |