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1da177e4 LT |
1 | /* |
2 | * linux/drivers/mmc/mmc.c | |
3 | * | |
4 | * Copyright (C) 2003-2004 Russell King, All Rights Reserved. | |
5b4fd9ae PO |
5 | * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. |
6 | * SD support Copyright (C) 2005 Pierre Ossman, All Rights Reserved. | |
1da177e4 LT |
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 | #include <linux/config.h> | |
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> | |
26 | #include <linux/mmc/protocol.h> | |
27 | ||
28 | #include "mmc.h" | |
29 | ||
30 | #ifdef CONFIG_MMC_DEBUG | |
31 | #define DBG(x...) printk(KERN_DEBUG x) | |
32 | #else | |
33 | #define DBG(x...) do { } while (0) | |
34 | #endif | |
35 | ||
36 | #define CMD_RETRIES 3 | |
37 | ||
38 | /* | |
39 | * OCR Bit positions to 10s of Vdd mV. | |
40 | */ | |
41 | static const unsigned short mmc_ocr_bit_to_vdd[] = { | |
42 | 150, 155, 160, 165, 170, 180, 190, 200, | |
43 | 210, 220, 230, 240, 250, 260, 270, 280, | |
44 | 290, 300, 310, 320, 330, 340, 350, 360 | |
45 | }; | |
46 | ||
47 | static const unsigned int tran_exp[] = { | |
48 | 10000, 100000, 1000000, 10000000, | |
49 | 0, 0, 0, 0 | |
50 | }; | |
51 | ||
52 | static const unsigned char tran_mant[] = { | |
53 | 0, 10, 12, 13, 15, 20, 25, 30, | |
54 | 35, 40, 45, 50, 55, 60, 70, 80, | |
55 | }; | |
56 | ||
57 | static const unsigned int tacc_exp[] = { | |
58 | 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, | |
59 | }; | |
60 | ||
61 | static const unsigned int tacc_mant[] = { | |
62 | 0, 10, 12, 13, 15, 20, 25, 30, | |
63 | 35, 40, 45, 50, 55, 60, 70, 80, | |
64 | }; | |
65 | ||
66 | ||
67 | /** | |
68 | * mmc_request_done - finish processing an MMC command | |
69 | * @host: MMC host which completed command | |
70 | * @mrq: MMC request which completed | |
71 | * | |
72 | * MMC drivers should call this function when they have completed | |
73 | * their processing of a command. This should be called before the | |
74 | * data part of the command has completed. | |
75 | */ | |
76 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
77 | { | |
78 | struct mmc_command *cmd = mrq->cmd; | |
79 | int err = mrq->cmd->error; | |
80 | DBG("MMC: req done (%02x): %d: %08x %08x %08x %08x\n", cmd->opcode, | |
81 | err, cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]); | |
82 | ||
83 | if (err && cmd->retries) { | |
84 | cmd->retries--; | |
85 | cmd->error = 0; | |
86 | host->ops->request(host, mrq); | |
87 | } else if (mrq->done) { | |
88 | mrq->done(mrq); | |
89 | } | |
90 | } | |
91 | ||
92 | EXPORT_SYMBOL(mmc_request_done); | |
93 | ||
94 | /** | |
95 | * mmc_start_request - start a command on a host | |
96 | * @host: MMC host to start command on | |
97 | * @mrq: MMC request to start | |
98 | * | |
99 | * Queue a command on the specified host. We expect the | |
100 | * caller to be holding the host lock with interrupts disabled. | |
101 | */ | |
102 | void | |
103 | mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) | |
104 | { | |
105 | DBG("MMC: starting cmd %02x arg %08x flags %08x\n", | |
106 | mrq->cmd->opcode, mrq->cmd->arg, mrq->cmd->flags); | |
107 | ||
108 | WARN_ON(host->card_busy == NULL); | |
109 | ||
110 | mrq->cmd->error = 0; | |
111 | mrq->cmd->mrq = mrq; | |
112 | if (mrq->data) { | |
113 | mrq->cmd->data = mrq->data; | |
114 | mrq->data->error = 0; | |
115 | mrq->data->mrq = mrq; | |
116 | if (mrq->stop) { | |
117 | mrq->data->stop = mrq->stop; | |
118 | mrq->stop->error = 0; | |
119 | mrq->stop->mrq = mrq; | |
120 | } | |
121 | } | |
122 | host->ops->request(host, mrq); | |
123 | } | |
124 | ||
125 | EXPORT_SYMBOL(mmc_start_request); | |
126 | ||
127 | static void mmc_wait_done(struct mmc_request *mrq) | |
128 | { | |
129 | complete(mrq->done_data); | |
130 | } | |
131 | ||
132 | int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
133 | { | |
134 | DECLARE_COMPLETION(complete); | |
135 | ||
136 | mrq->done_data = &complete; | |
137 | mrq->done = mmc_wait_done; | |
138 | ||
139 | mmc_start_request(host, mrq); | |
140 | ||
141 | wait_for_completion(&complete); | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | EXPORT_SYMBOL(mmc_wait_for_req); | |
147 | ||
148 | /** | |
149 | * mmc_wait_for_cmd - start a command and wait for completion | |
150 | * @host: MMC host to start command | |
151 | * @cmd: MMC command to start | |
152 | * @retries: maximum number of retries | |
153 | * | |
154 | * Start a new MMC command for a host, and wait for the command | |
155 | * to complete. Return any error that occurred while the command | |
156 | * was executing. Do not attempt to parse the response. | |
157 | */ | |
158 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
159 | { | |
160 | struct mmc_request mrq; | |
161 | ||
162 | BUG_ON(host->card_busy == NULL); | |
163 | ||
164 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
165 | ||
166 | memset(cmd->resp, 0, sizeof(cmd->resp)); | |
167 | cmd->retries = retries; | |
168 | ||
169 | mrq.cmd = cmd; | |
170 | cmd->data = NULL; | |
171 | ||
172 | mmc_wait_for_req(host, &mrq); | |
173 | ||
174 | return cmd->error; | |
175 | } | |
176 | ||
177 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
178 | ||
335eadf2 PO |
179 | /** |
180 | * mmc_wait_for_app_cmd - start an application command and wait for | |
181 | completion | |
182 | * @host: MMC host to start command | |
183 | * @rca: RCA to send MMC_APP_CMD to | |
184 | * @cmd: MMC command to start | |
185 | * @retries: maximum number of retries | |
186 | * | |
187 | * Sends a MMC_APP_CMD, checks the card response, sends the command | |
188 | * in the parameter and waits for it to complete. Return any error | |
189 | * that occurred while the command was executing. Do not attempt to | |
190 | * parse the response. | |
191 | */ | |
192 | int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca, | |
193 | struct mmc_command *cmd, int retries) | |
194 | { | |
195 | struct mmc_request mrq; | |
196 | struct mmc_command appcmd; | |
197 | ||
198 | int i, err; | |
199 | ||
200 | BUG_ON(host->card_busy == NULL); | |
201 | BUG_ON(retries < 0); | |
202 | ||
203 | err = MMC_ERR_INVALID; | |
204 | ||
205 | /* | |
206 | * We have to resend MMC_APP_CMD for each attempt so | |
207 | * we cannot use the retries field in mmc_command. | |
208 | */ | |
209 | for (i = 0;i <= retries;i++) { | |
210 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
211 | ||
212 | appcmd.opcode = MMC_APP_CMD; | |
213 | appcmd.arg = rca << 16; | |
214 | appcmd.flags = MMC_RSP_R1; | |
215 | appcmd.retries = 0; | |
216 | memset(appcmd.resp, 0, sizeof(appcmd.resp)); | |
217 | appcmd.data = NULL; | |
218 | ||
219 | mrq.cmd = &appcmd; | |
220 | appcmd.data = NULL; | |
221 | ||
222 | mmc_wait_for_req(host, &mrq); | |
223 | ||
224 | if (appcmd.error) { | |
225 | err = appcmd.error; | |
226 | continue; | |
227 | } | |
228 | ||
229 | /* Check that card supported application commands */ | |
230 | if (!(appcmd.resp[0] & R1_APP_CMD)) | |
231 | return MMC_ERR_FAILED; | |
232 | ||
233 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
234 | ||
235 | memset(cmd->resp, 0, sizeof(cmd->resp)); | |
236 | cmd->retries = 0; | |
237 | ||
238 | mrq.cmd = cmd; | |
239 | cmd->data = NULL; | |
1da177e4 | 240 | |
335eadf2 PO |
241 | mmc_wait_for_req(host, &mrq); |
242 | ||
243 | err = cmd->error; | |
244 | if (cmd->error == MMC_ERR_NONE) | |
245 | break; | |
246 | } | |
247 | ||
248 | return err; | |
249 | } | |
250 | ||
251 | EXPORT_SYMBOL(mmc_wait_for_app_cmd); | |
1da177e4 | 252 | |
b57c43ad PO |
253 | static int mmc_select_card(struct mmc_host *host, struct mmc_card *card); |
254 | ||
1da177e4 LT |
255 | /** |
256 | * __mmc_claim_host - exclusively claim a host | |
257 | * @host: mmc host to claim | |
258 | * @card: mmc card to claim host for | |
259 | * | |
260 | * Claim a host for a set of operations. If a valid card | |
261 | * is passed and this wasn't the last card selected, select | |
262 | * the card before returning. | |
263 | * | |
264 | * Note: you should use mmc_card_claim_host or mmc_claim_host. | |
265 | */ | |
266 | int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card) | |
267 | { | |
268 | DECLARE_WAITQUEUE(wait, current); | |
269 | unsigned long flags; | |
270 | int err = 0; | |
271 | ||
272 | add_wait_queue(&host->wq, &wait); | |
273 | spin_lock_irqsave(&host->lock, flags); | |
274 | while (1) { | |
275 | set_current_state(TASK_UNINTERRUPTIBLE); | |
276 | if (host->card_busy == NULL) | |
277 | break; | |
278 | spin_unlock_irqrestore(&host->lock, flags); | |
279 | schedule(); | |
280 | spin_lock_irqsave(&host->lock, flags); | |
281 | } | |
282 | set_current_state(TASK_RUNNING); | |
283 | host->card_busy = card; | |
284 | spin_unlock_irqrestore(&host->lock, flags); | |
285 | remove_wait_queue(&host->wq, &wait); | |
286 | ||
b57c43ad PO |
287 | if (card != (void *)-1) { |
288 | err = mmc_select_card(host, card); | |
289 | if (err != MMC_ERR_NONE) | |
290 | return err; | |
1da177e4 LT |
291 | } |
292 | ||
293 | return err; | |
294 | } | |
295 | ||
296 | EXPORT_SYMBOL(__mmc_claim_host); | |
297 | ||
298 | /** | |
299 | * mmc_release_host - release a host | |
300 | * @host: mmc host to release | |
301 | * | |
302 | * Release a MMC host, allowing others to claim the host | |
303 | * for their operations. | |
304 | */ | |
305 | void mmc_release_host(struct mmc_host *host) | |
306 | { | |
307 | unsigned long flags; | |
308 | ||
309 | BUG_ON(host->card_busy == NULL); | |
310 | ||
311 | spin_lock_irqsave(&host->lock, flags); | |
312 | host->card_busy = NULL; | |
313 | spin_unlock_irqrestore(&host->lock, flags); | |
314 | ||
315 | wake_up(&host->wq); | |
316 | } | |
317 | ||
318 | EXPORT_SYMBOL(mmc_release_host); | |
319 | ||
b57c43ad PO |
320 | static int mmc_select_card(struct mmc_host *host, struct mmc_card *card) |
321 | { | |
322 | int err; | |
323 | struct mmc_command cmd; | |
324 | ||
325 | BUG_ON(host->card_busy == NULL); | |
326 | ||
327 | if (host->card_selected == card) | |
328 | return MMC_ERR_NONE; | |
329 | ||
330 | host->card_selected = card; | |
331 | ||
332 | cmd.opcode = MMC_SELECT_CARD; | |
333 | cmd.arg = card->rca << 16; | |
334 | cmd.flags = MMC_RSP_R1; | |
335 | ||
336 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
337 | if (err != MMC_ERR_NONE) | |
338 | return err; | |
339 | ||
f218278a PO |
340 | /* |
341 | * Default bus width is 1 bit. | |
342 | */ | |
343 | host->ios.bus_width = MMC_BUS_WIDTH_1; | |
344 | ||
345 | /* | |
346 | * We can only change the bus width of the selected | |
347 | * card so therefore we have to put the handling | |
348 | * here. | |
349 | */ | |
350 | if (host->caps & MMC_CAP_4_BIT_DATA) { | |
351 | /* | |
352 | * The card is in 1 bit mode by default so | |
353 | * we only need to change if it supports the | |
354 | * wider version. | |
355 | */ | |
356 | if (mmc_card_sd(card) && | |
357 | (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { | |
358 | struct mmc_command cmd; | |
359 | cmd.opcode = SD_APP_SET_BUS_WIDTH; | |
360 | cmd.arg = SD_BUS_WIDTH_4; | |
361 | cmd.flags = MMC_RSP_R1; | |
362 | ||
363 | err = mmc_wait_for_app_cmd(host, card->rca, &cmd, | |
364 | CMD_RETRIES); | |
365 | if (err != MMC_ERR_NONE) | |
366 | return err; | |
367 | ||
368 | host->ios.bus_width = MMC_BUS_WIDTH_4; | |
369 | } | |
370 | } | |
371 | ||
372 | host->ops->set_ios(host, &host->ios); | |
373 | ||
b57c43ad PO |
374 | return MMC_ERR_NONE; |
375 | } | |
376 | ||
1da177e4 LT |
377 | /* |
378 | * Ensure that no card is selected. | |
379 | */ | |
380 | static void mmc_deselect_cards(struct mmc_host *host) | |
381 | { | |
382 | struct mmc_command cmd; | |
383 | ||
384 | if (host->card_selected) { | |
385 | host->card_selected = NULL; | |
386 | ||
387 | cmd.opcode = MMC_SELECT_CARD; | |
388 | cmd.arg = 0; | |
389 | cmd.flags = MMC_RSP_NONE; | |
390 | ||
391 | mmc_wait_for_cmd(host, &cmd, 0); | |
392 | } | |
393 | } | |
394 | ||
395 | ||
396 | static inline void mmc_delay(unsigned int ms) | |
397 | { | |
398 | if (ms < HZ / 1000) { | |
399 | yield(); | |
400 | mdelay(ms); | |
401 | } else { | |
402 | msleep_interruptible (ms); | |
403 | } | |
404 | } | |
405 | ||
406 | /* | |
407 | * Mask off any voltages we don't support and select | |
408 | * the lowest voltage | |
409 | */ | |
410 | static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) | |
411 | { | |
412 | int bit; | |
413 | ||
414 | ocr &= host->ocr_avail; | |
415 | ||
416 | bit = ffs(ocr); | |
417 | if (bit) { | |
418 | bit -= 1; | |
419 | ||
420 | ocr = 3 << bit; | |
421 | ||
422 | host->ios.vdd = bit; | |
423 | host->ops->set_ios(host, &host->ios); | |
424 | } else { | |
425 | ocr = 0; | |
426 | } | |
427 | ||
428 | return ocr; | |
429 | } | |
430 | ||
431 | #define UNSTUFF_BITS(resp,start,size) \ | |
432 | ({ \ | |
433 | const int __size = size; \ | |
434 | const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ | |
435 | const int __off = 3 - ((start) / 32); \ | |
436 | const int __shft = (start) & 31; \ | |
437 | u32 __res; \ | |
438 | \ | |
439 | __res = resp[__off] >> __shft; \ | |
440 | if (__size + __shft > 32) \ | |
441 | __res |= resp[__off-1] << ((32 - __shft) % 32); \ | |
442 | __res & __mask; \ | |
443 | }) | |
444 | ||
445 | /* | |
446 | * Given the decoded CSD structure, decode the raw CID to our CID structure. | |
447 | */ | |
448 | static void mmc_decode_cid(struct mmc_card *card) | |
449 | { | |
450 | u32 *resp = card->raw_cid; | |
451 | ||
452 | memset(&card->cid, 0, sizeof(struct mmc_cid)); | |
453 | ||
335eadf2 PO |
454 | if (mmc_card_sd(card)) { |
455 | /* | |
456 | * SD doesn't currently have a version field so we will | |
457 | * have to assume we can parse this. | |
458 | */ | |
459 | card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); | |
460 | card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); | |
461 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
462 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
463 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
464 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
465 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
466 | card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); | |
467 | card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); | |
468 | card->cid.serial = UNSTUFF_BITS(resp, 24, 32); | |
469 | card->cid.year = UNSTUFF_BITS(resp, 12, 8); | |
470 | card->cid.month = UNSTUFF_BITS(resp, 8, 4); | |
471 | ||
472 | card->cid.year += 2000; /* SD cards year offset */ | |
a00fc090 | 473 | } else { |
335eadf2 PO |
474 | /* |
475 | * The selection of the format here is based upon published | |
476 | * specs from sandisk and from what people have reported. | |
477 | */ | |
478 | switch (card->csd.mmca_vsn) { | |
479 | case 0: /* MMC v1.0 - v1.2 */ | |
480 | case 1: /* MMC v1.4 */ | |
481 | card->cid.manfid = UNSTUFF_BITS(resp, 104, 24); | |
482 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
483 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
484 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
485 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
486 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
487 | card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); | |
488 | card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8); | |
489 | card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4); | |
490 | card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4); | |
491 | card->cid.serial = UNSTUFF_BITS(resp, 16, 24); | |
492 | card->cid.month = UNSTUFF_BITS(resp, 12, 4); | |
493 | card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; | |
494 | break; | |
495 | ||
496 | case 2: /* MMC v2.0 - v2.2 */ | |
497 | case 3: /* MMC v3.1 - v3.3 */ | |
498 | card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); | |
499 | card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); | |
500 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
501 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
502 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
503 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
504 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
505 | card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); | |
506 | card->cid.serial = UNSTUFF_BITS(resp, 16, 32); | |
507 | card->cid.month = UNSTUFF_BITS(resp, 12, 4); | |
508 | card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; | |
509 | break; | |
510 | ||
511 | default: | |
512 | printk("%s: card has unknown MMCA version %d\n", | |
513 | mmc_hostname(card->host), card->csd.mmca_vsn); | |
514 | mmc_card_set_bad(card); | |
515 | break; | |
516 | } | |
1da177e4 LT |
517 | } |
518 | } | |
519 | ||
520 | /* | |
521 | * Given a 128-bit response, decode to our card CSD structure. | |
522 | */ | |
523 | static void mmc_decode_csd(struct mmc_card *card) | |
524 | { | |
525 | struct mmc_csd *csd = &card->csd; | |
526 | unsigned int e, m, csd_struct; | |
527 | u32 *resp = card->raw_csd; | |
528 | ||
335eadf2 PO |
529 | if (mmc_card_sd(card)) { |
530 | csd_struct = UNSTUFF_BITS(resp, 126, 2); | |
531 | if (csd_struct != 0) { | |
532 | printk("%s: unrecognised CSD structure version %d\n", | |
533 | mmc_hostname(card->host), csd_struct); | |
534 | mmc_card_set_bad(card); | |
535 | return; | |
536 | } | |
537 | ||
538 | m = UNSTUFF_BITS(resp, 115, 4); | |
539 | e = UNSTUFF_BITS(resp, 112, 3); | |
540 | csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; | |
541 | csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; | |
542 | ||
543 | m = UNSTUFF_BITS(resp, 99, 4); | |
544 | e = UNSTUFF_BITS(resp, 96, 3); | |
545 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
546 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
547 | ||
548 | e = UNSTUFF_BITS(resp, 47, 3); | |
549 | m = UNSTUFF_BITS(resp, 62, 12); | |
550 | csd->capacity = (1 + m) << (e + 2); | |
551 | ||
552 | csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); | |
a00fc090 | 553 | } else { |
335eadf2 PO |
554 | /* |
555 | * We only understand CSD structure v1.1 and v1.2. | |
556 | * v1.2 has extra information in bits 15, 11 and 10. | |
557 | */ | |
558 | csd_struct = UNSTUFF_BITS(resp, 126, 2); | |
559 | if (csd_struct != 1 && csd_struct != 2) { | |
560 | printk("%s: unrecognised CSD structure version %d\n", | |
561 | mmc_hostname(card->host), csd_struct); | |
562 | mmc_card_set_bad(card); | |
563 | return; | |
564 | } | |
1da177e4 | 565 | |
335eadf2 PO |
566 | csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4); |
567 | m = UNSTUFF_BITS(resp, 115, 4); | |
568 | e = UNSTUFF_BITS(resp, 112, 3); | |
569 | csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; | |
570 | csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; | |
1da177e4 | 571 | |
335eadf2 PO |
572 | m = UNSTUFF_BITS(resp, 99, 4); |
573 | e = UNSTUFF_BITS(resp, 96, 3); | |
574 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
575 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
1da177e4 | 576 | |
335eadf2 PO |
577 | e = UNSTUFF_BITS(resp, 47, 3); |
578 | m = UNSTUFF_BITS(resp, 62, 12); | |
579 | csd->capacity = (1 + m) << (e + 2); | |
1da177e4 | 580 | |
335eadf2 PO |
581 | csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); |
582 | } | |
1da177e4 LT |
583 | } |
584 | ||
b57c43ad PO |
585 | /* |
586 | * Given a 64-bit response, decode to our card SCR structure. | |
587 | */ | |
588 | static void mmc_decode_scr(struct mmc_card *card) | |
589 | { | |
590 | struct sd_scr *scr = &card->scr; | |
591 | unsigned int scr_struct; | |
592 | u32 resp[4]; | |
593 | ||
594 | BUG_ON(!mmc_card_sd(card)); | |
595 | ||
596 | resp[3] = card->raw_scr[1]; | |
597 | resp[2] = card->raw_scr[0]; | |
598 | ||
599 | scr_struct = UNSTUFF_BITS(resp, 60, 4); | |
600 | if (scr_struct != 0) { | |
601 | printk("%s: unrecognised SCR structure version %d\n", | |
602 | mmc_hostname(card->host), scr_struct); | |
603 | mmc_card_set_bad(card); | |
604 | return; | |
605 | } | |
606 | ||
607 | scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); | |
608 | scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); | |
609 | } | |
610 | ||
1da177e4 LT |
611 | /* |
612 | * Locate a MMC card on this MMC host given a raw CID. | |
613 | */ | |
614 | static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid) | |
615 | { | |
616 | struct mmc_card *card; | |
617 | ||
618 | list_for_each_entry(card, &host->cards, node) { | |
619 | if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0) | |
620 | return card; | |
621 | } | |
622 | return NULL; | |
623 | } | |
624 | ||
625 | /* | |
626 | * Allocate a new MMC card, and assign a unique RCA. | |
627 | */ | |
628 | static struct mmc_card * | |
629 | mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca) | |
630 | { | |
631 | struct mmc_card *card, *c; | |
632 | unsigned int rca = *frca; | |
633 | ||
634 | card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL); | |
635 | if (!card) | |
636 | return ERR_PTR(-ENOMEM); | |
637 | ||
638 | mmc_init_card(card, host); | |
639 | memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid)); | |
640 | ||
641 | again: | |
642 | list_for_each_entry(c, &host->cards, node) | |
643 | if (c->rca == rca) { | |
644 | rca++; | |
645 | goto again; | |
646 | } | |
647 | ||
648 | card->rca = rca; | |
649 | ||
650 | *frca = rca; | |
651 | ||
652 | return card; | |
653 | } | |
654 | ||
655 | /* | |
656 | * Tell attached cards to go to IDLE state | |
657 | */ | |
658 | static void mmc_idle_cards(struct mmc_host *host) | |
659 | { | |
660 | struct mmc_command cmd; | |
661 | ||
865e9f13 PO |
662 | host->ios.chip_select = MMC_CS_HIGH; |
663 | host->ops->set_ios(host, &host->ios); | |
664 | ||
665 | mmc_delay(1); | |
666 | ||
1da177e4 LT |
667 | cmd.opcode = MMC_GO_IDLE_STATE; |
668 | cmd.arg = 0; | |
669 | cmd.flags = MMC_RSP_NONE; | |
670 | ||
671 | mmc_wait_for_cmd(host, &cmd, 0); | |
672 | ||
673 | mmc_delay(1); | |
865e9f13 PO |
674 | |
675 | host->ios.chip_select = MMC_CS_DONTCARE; | |
676 | host->ops->set_ios(host, &host->ios); | |
677 | ||
678 | mmc_delay(1); | |
1da177e4 LT |
679 | } |
680 | ||
681 | /* | |
45f8245b RK |
682 | * Apply power to the MMC stack. This is a two-stage process. |
683 | * First, we enable power to the card without the clock running. | |
684 | * We then wait a bit for the power to stabilise. Finally, | |
685 | * enable the bus drivers and clock to the card. | |
686 | * | |
687 | * We must _NOT_ enable the clock prior to power stablising. | |
688 | * | |
689 | * If a host does all the power sequencing itself, ignore the | |
690 | * initial MMC_POWER_UP stage. | |
1da177e4 LT |
691 | */ |
692 | static void mmc_power_up(struct mmc_host *host) | |
693 | { | |
694 | int bit = fls(host->ocr_avail) - 1; | |
695 | ||
696 | host->ios.vdd = bit; | |
697 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
865e9f13 | 698 | host->ios.chip_select = MMC_CS_DONTCARE; |
1da177e4 | 699 | host->ios.power_mode = MMC_POWER_UP; |
f218278a | 700 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
1da177e4 LT |
701 | host->ops->set_ios(host, &host->ios); |
702 | ||
703 | mmc_delay(1); | |
704 | ||
705 | host->ios.clock = host->f_min; | |
706 | host->ios.power_mode = MMC_POWER_ON; | |
707 | host->ops->set_ios(host, &host->ios); | |
708 | ||
709 | mmc_delay(2); | |
710 | } | |
711 | ||
712 | static void mmc_power_off(struct mmc_host *host) | |
713 | { | |
714 | host->ios.clock = 0; | |
715 | host->ios.vdd = 0; | |
716 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
865e9f13 | 717 | host->ios.chip_select = MMC_CS_DONTCARE; |
1da177e4 | 718 | host->ios.power_mode = MMC_POWER_OFF; |
f218278a | 719 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
1da177e4 LT |
720 | host->ops->set_ios(host, &host->ios); |
721 | } | |
722 | ||
723 | static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) | |
724 | { | |
725 | struct mmc_command cmd; | |
726 | int i, err = 0; | |
727 | ||
728 | cmd.opcode = MMC_SEND_OP_COND; | |
729 | cmd.arg = ocr; | |
730 | cmd.flags = MMC_RSP_R3; | |
731 | ||
732 | for (i = 100; i; i--) { | |
733 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
734 | if (err != MMC_ERR_NONE) | |
735 | break; | |
736 | ||
737 | if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0) | |
738 | break; | |
739 | ||
740 | err = MMC_ERR_TIMEOUT; | |
741 | ||
742 | mmc_delay(10); | |
743 | } | |
744 | ||
745 | if (rocr) | |
746 | *rocr = cmd.resp[0]; | |
747 | ||
748 | return err; | |
749 | } | |
750 | ||
335eadf2 PO |
751 | static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) |
752 | { | |
753 | struct mmc_command cmd; | |
754 | int i, err = 0; | |
755 | ||
756 | cmd.opcode = SD_APP_OP_COND; | |
757 | cmd.arg = ocr; | |
758 | cmd.flags = MMC_RSP_R3; | |
759 | ||
760 | for (i = 100; i; i--) { | |
761 | err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES); | |
762 | if (err != MMC_ERR_NONE) | |
763 | break; | |
764 | ||
765 | if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0) | |
766 | break; | |
767 | ||
768 | err = MMC_ERR_TIMEOUT; | |
769 | ||
770 | mmc_delay(10); | |
771 | } | |
772 | ||
773 | if (rocr) | |
774 | *rocr = cmd.resp[0]; | |
775 | ||
776 | return err; | |
777 | } | |
778 | ||
1da177e4 LT |
779 | /* |
780 | * Discover cards by requesting their CID. If this command | |
781 | * times out, it is not an error; there are no further cards | |
782 | * to be discovered. Add new cards to the list. | |
783 | * | |
784 | * Create a mmc_card entry for each discovered card, assigning | |
785 | * it an RCA, and save the raw CID for decoding later. | |
786 | */ | |
787 | static void mmc_discover_cards(struct mmc_host *host) | |
788 | { | |
789 | struct mmc_card *card; | |
790 | unsigned int first_rca = 1, err; | |
791 | ||
792 | while (1) { | |
793 | struct mmc_command cmd; | |
794 | ||
795 | cmd.opcode = MMC_ALL_SEND_CID; | |
796 | cmd.arg = 0; | |
797 | cmd.flags = MMC_RSP_R2; | |
798 | ||
799 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
800 | if (err == MMC_ERR_TIMEOUT) { | |
801 | err = MMC_ERR_NONE; | |
802 | break; | |
803 | } | |
804 | if (err != MMC_ERR_NONE) { | |
805 | printk(KERN_ERR "%s: error requesting CID: %d\n", | |
d366b643 | 806 | mmc_hostname(host), err); |
1da177e4 LT |
807 | break; |
808 | } | |
809 | ||
810 | card = mmc_find_card(host, cmd.resp); | |
811 | if (!card) { | |
812 | card = mmc_alloc_card(host, cmd.resp, &first_rca); | |
813 | if (IS_ERR(card)) { | |
814 | err = PTR_ERR(card); | |
815 | break; | |
816 | } | |
817 | list_add(&card->node, &host->cards); | |
818 | } | |
819 | ||
820 | card->state &= ~MMC_STATE_DEAD; | |
821 | ||
335eadf2 PO |
822 | if (host->mode == MMC_MODE_SD) { |
823 | mmc_card_set_sd(card); | |
1da177e4 | 824 | |
335eadf2 PO |
825 | cmd.opcode = SD_SEND_RELATIVE_ADDR; |
826 | cmd.arg = 0; | |
24117def | 827 | cmd.flags = MMC_RSP_R6; |
335eadf2 PO |
828 | |
829 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
830 | if (err != MMC_ERR_NONE) | |
831 | mmc_card_set_dead(card); | |
a00fc090 | 832 | else { |
335eadf2 | 833 | card->rca = cmd.resp[0] >> 16; |
a00fc090 PO |
834 | |
835 | if (!host->ops->get_ro) { | |
836 | printk(KERN_WARNING "%s: host does not " | |
837 | "support reading read-only " | |
838 | "switch. assuming write-enable.\n", | |
839 | mmc_hostname(host)); | |
840 | } else { | |
841 | if (host->ops->get_ro(host)) | |
842 | mmc_card_set_readonly(card); | |
843 | } | |
844 | } | |
845 | } else { | |
335eadf2 PO |
846 | cmd.opcode = MMC_SET_RELATIVE_ADDR; |
847 | cmd.arg = card->rca << 16; | |
848 | cmd.flags = MMC_RSP_R1; | |
849 | ||
850 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
851 | if (err != MMC_ERR_NONE) | |
852 | mmc_card_set_dead(card); | |
853 | } | |
1da177e4 LT |
854 | } |
855 | } | |
856 | ||
857 | static void mmc_read_csds(struct mmc_host *host) | |
858 | { | |
859 | struct mmc_card *card; | |
860 | ||
861 | list_for_each_entry(card, &host->cards, node) { | |
862 | struct mmc_command cmd; | |
863 | int err; | |
864 | ||
865 | if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) | |
866 | continue; | |
867 | ||
868 | cmd.opcode = MMC_SEND_CSD; | |
869 | cmd.arg = card->rca << 16; | |
870 | cmd.flags = MMC_RSP_R2; | |
871 | ||
872 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
873 | if (err != MMC_ERR_NONE) { | |
874 | mmc_card_set_dead(card); | |
875 | continue; | |
876 | } | |
877 | ||
878 | memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd)); | |
879 | ||
880 | mmc_decode_csd(card); | |
881 | mmc_decode_cid(card); | |
882 | } | |
883 | } | |
884 | ||
b57c43ad PO |
885 | static void mmc_read_scrs(struct mmc_host *host) |
886 | { | |
887 | int err; | |
888 | struct mmc_card *card; | |
889 | ||
890 | struct mmc_request mrq; | |
891 | struct mmc_command cmd; | |
892 | struct mmc_data data; | |
893 | ||
894 | struct scatterlist sg; | |
895 | ||
896 | list_for_each_entry(card, &host->cards, node) { | |
897 | if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) | |
898 | continue; | |
899 | if (!mmc_card_sd(card)) | |
900 | continue; | |
901 | ||
902 | err = mmc_select_card(host, card); | |
903 | if (err != MMC_ERR_NONE) { | |
904 | mmc_card_set_dead(card); | |
905 | continue; | |
906 | } | |
907 | ||
908 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
909 | ||
910 | cmd.opcode = MMC_APP_CMD; | |
911 | cmd.arg = card->rca << 16; | |
912 | cmd.flags = MMC_RSP_R1; | |
913 | ||
914 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
915 | if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) { | |
916 | mmc_card_set_dead(card); | |
917 | continue; | |
918 | } | |
919 | ||
920 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
921 | ||
922 | cmd.opcode = SD_APP_SEND_SCR; | |
923 | cmd.arg = 0; | |
924 | cmd.flags = MMC_RSP_R1; | |
925 | ||
926 | memset(&data, 0, sizeof(struct mmc_data)); | |
927 | ||
928 | data.timeout_ns = card->csd.tacc_ns * 10; | |
929 | data.timeout_clks = card->csd.tacc_clks * 10; | |
930 | data.blksz_bits = 3; | |
931 | data.blocks = 1; | |
932 | data.flags = MMC_DATA_READ; | |
933 | data.sg = &sg; | |
934 | data.sg_len = 1; | |
935 | ||
936 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
937 | ||
938 | mrq.cmd = &cmd; | |
939 | mrq.data = &data; | |
940 | ||
941 | sg_init_one(&sg, (u8*)card->raw_scr, 8); | |
942 | ||
e781de44 PO |
943 | mmc_wait_for_req(host, &mrq); |
944 | ||
945 | if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) { | |
b57c43ad PO |
946 | mmc_card_set_dead(card); |
947 | continue; | |
948 | } | |
949 | ||
950 | card->raw_scr[0] = ntohl(card->raw_scr[0]); | |
951 | card->raw_scr[1] = ntohl(card->raw_scr[1]); | |
952 | ||
953 | mmc_decode_scr(card); | |
954 | } | |
955 | ||
956 | mmc_deselect_cards(host); | |
957 | } | |
958 | ||
1da177e4 LT |
959 | static unsigned int mmc_calculate_clock(struct mmc_host *host) |
960 | { | |
961 | struct mmc_card *card; | |
962 | unsigned int max_dtr = host->f_max; | |
963 | ||
964 | list_for_each_entry(card, &host->cards, node) | |
965 | if (!mmc_card_dead(card) && max_dtr > card->csd.max_dtr) | |
966 | max_dtr = card->csd.max_dtr; | |
967 | ||
968 | DBG("MMC: selected %d.%03dMHz transfer rate\n", | |
969 | max_dtr / 1000000, (max_dtr / 1000) % 1000); | |
970 | ||
971 | return max_dtr; | |
972 | } | |
973 | ||
974 | /* | |
975 | * Check whether cards we already know about are still present. | |
976 | * We do this by requesting status, and checking whether a card | |
977 | * responds. | |
978 | * | |
979 | * A request for status does not cause a state change in data | |
980 | * transfer mode. | |
981 | */ | |
982 | static void mmc_check_cards(struct mmc_host *host) | |
983 | { | |
984 | struct list_head *l, *n; | |
985 | ||
986 | mmc_deselect_cards(host); | |
987 | ||
988 | list_for_each_safe(l, n, &host->cards) { | |
989 | struct mmc_card *card = mmc_list_to_card(l); | |
990 | struct mmc_command cmd; | |
991 | int err; | |
992 | ||
993 | cmd.opcode = MMC_SEND_STATUS; | |
994 | cmd.arg = card->rca << 16; | |
995 | cmd.flags = MMC_RSP_R1; | |
996 | ||
997 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
998 | if (err == MMC_ERR_NONE) | |
999 | continue; | |
1000 | ||
1001 | mmc_card_set_dead(card); | |
1002 | } | |
1003 | } | |
1004 | ||
1005 | static void mmc_setup(struct mmc_host *host) | |
1006 | { | |
1007 | if (host->ios.power_mode != MMC_POWER_ON) { | |
1008 | int err; | |
1009 | u32 ocr; | |
1010 | ||
a00fc090 | 1011 | host->mode = MMC_MODE_SD; |
335eadf2 | 1012 | |
1da177e4 LT |
1013 | mmc_power_up(host); |
1014 | mmc_idle_cards(host); | |
1015 | ||
a00fc090 | 1016 | err = mmc_send_app_op_cond(host, 0, &ocr); |
335eadf2 PO |
1017 | |
1018 | /* | |
a00fc090 PO |
1019 | * If we fail to detect any SD cards then try |
1020 | * searching for MMC cards. | |
335eadf2 | 1021 | */ |
a00fc090 PO |
1022 | if (err != MMC_ERR_NONE) { |
1023 | host->mode = MMC_MODE_MMC; | |
1024 | ||
1025 | err = mmc_send_op_cond(host, 0, &ocr); | |
335eadf2 PO |
1026 | if (err != MMC_ERR_NONE) |
1027 | return; | |
335eadf2 | 1028 | } |
1da177e4 LT |
1029 | |
1030 | host->ocr = mmc_select_voltage(host, ocr); | |
1031 | ||
1032 | /* | |
1033 | * Since we're changing the OCR value, we seem to | |
1034 | * need to tell some cards to go back to the idle | |
1035 | * state. We wait 1ms to give cards time to | |
1036 | * respond. | |
1037 | */ | |
1038 | if (host->ocr) | |
1039 | mmc_idle_cards(host); | |
1040 | } else { | |
1041 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
1042 | host->ios.clock = host->f_min; | |
1043 | host->ops->set_ios(host, &host->ios); | |
1044 | ||
1045 | /* | |
1046 | * We should remember the OCR mask from the existing | |
1047 | * cards, and detect the new cards OCR mask, combine | |
1048 | * the two and re-select the VDD. However, if we do | |
1049 | * change VDD, we should do an idle, and then do a | |
1050 | * full re-initialisation. We would need to notify | |
1051 | * drivers so that they can re-setup the cards as | |
1052 | * well, while keeping their queues at bay. | |
1053 | * | |
1054 | * For the moment, we take the easy way out - if the | |
1055 | * new cards don't like our currently selected VDD, | |
1056 | * they drop off the bus. | |
1057 | */ | |
1058 | } | |
1059 | ||
1060 | if (host->ocr == 0) | |
1061 | return; | |
1062 | ||
1063 | /* | |
1064 | * Send the selected OCR multiple times... until the cards | |
1065 | * all get the idea that they should be ready for CMD2. | |
1066 | * (My SanDisk card seems to need this.) | |
1067 | */ | |
335eadf2 PO |
1068 | if (host->mode == MMC_MODE_SD) |
1069 | mmc_send_app_op_cond(host, host->ocr, NULL); | |
1070 | else | |
1071 | mmc_send_op_cond(host, host->ocr, NULL); | |
1da177e4 LT |
1072 | |
1073 | mmc_discover_cards(host); | |
1074 | ||
1075 | /* | |
1076 | * Ok, now switch to push-pull mode. | |
1077 | */ | |
1078 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
1079 | host->ops->set_ios(host, &host->ios); | |
1080 | ||
1081 | mmc_read_csds(host); | |
b57c43ad PO |
1082 | |
1083 | if (host->mode == MMC_MODE_SD) | |
1084 | mmc_read_scrs(host); | |
1da177e4 LT |
1085 | } |
1086 | ||
1087 | ||
1088 | /** | |
1089 | * mmc_detect_change - process change of state on a MMC socket | |
1090 | * @host: host which changed state. | |
8dc00335 | 1091 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 LT |
1092 | * |
1093 | * All we know is that card(s) have been inserted or removed | |
1094 | * from the socket(s). We don't know which socket or cards. | |
1095 | */ | |
8dc00335 | 1096 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 1097 | { |
8dc00335 RP |
1098 | if (delay) |
1099 | schedule_delayed_work(&host->detect, delay); | |
1100 | else | |
1101 | schedule_work(&host->detect); | |
1da177e4 LT |
1102 | } |
1103 | ||
1104 | EXPORT_SYMBOL(mmc_detect_change); | |
1105 | ||
1106 | ||
1107 | static void mmc_rescan(void *data) | |
1108 | { | |
1109 | struct mmc_host *host = data; | |
1110 | struct list_head *l, *n; | |
1111 | ||
1112 | mmc_claim_host(host); | |
1113 | ||
1114 | if (host->ios.power_mode == MMC_POWER_ON) | |
1115 | mmc_check_cards(host); | |
1116 | ||
1117 | mmc_setup(host); | |
1118 | ||
1119 | if (!list_empty(&host->cards)) { | |
1120 | /* | |
1121 | * (Re-)calculate the fastest clock rate which the | |
1122 | * attached cards and the host support. | |
1123 | */ | |
1124 | host->ios.clock = mmc_calculate_clock(host); | |
1125 | host->ops->set_ios(host, &host->ios); | |
1126 | } | |
1127 | ||
1128 | mmc_release_host(host); | |
1129 | ||
1130 | list_for_each_safe(l, n, &host->cards) { | |
1131 | struct mmc_card *card = mmc_list_to_card(l); | |
1132 | ||
1133 | /* | |
1134 | * If this is a new and good card, register it. | |
1135 | */ | |
1136 | if (!mmc_card_present(card) && !mmc_card_dead(card)) { | |
1137 | if (mmc_register_card(card)) | |
1138 | mmc_card_set_dead(card); | |
1139 | else | |
1140 | mmc_card_set_present(card); | |
1141 | } | |
1142 | ||
1143 | /* | |
1144 | * If this card is dead, destroy it. | |
1145 | */ | |
1146 | if (mmc_card_dead(card)) { | |
1147 | list_del(&card->node); | |
1148 | mmc_remove_card(card); | |
1149 | } | |
1150 | } | |
1151 | ||
1152 | /* | |
1153 | * If we discover that there are no cards on the | |
1154 | * bus, turn off the clock and power down. | |
1155 | */ | |
1156 | if (list_empty(&host->cards)) | |
1157 | mmc_power_off(host); | |
1158 | } | |
1159 | ||
1160 | ||
1161 | /** | |
1162 | * mmc_alloc_host - initialise the per-host structure. | |
1163 | * @extra: sizeof private data structure | |
1164 | * @dev: pointer to host device model structure | |
1165 | * | |
1166 | * Initialise the per-host structure. | |
1167 | */ | |
1168 | struct mmc_host *mmc_alloc_host(int extra, struct device *dev) | |
1169 | { | |
1170 | struct mmc_host *host; | |
1171 | ||
00b137cf | 1172 | host = mmc_alloc_host_sysfs(extra, dev); |
1da177e4 | 1173 | if (host) { |
1da177e4 LT |
1174 | spin_lock_init(&host->lock); |
1175 | init_waitqueue_head(&host->wq); | |
1176 | INIT_LIST_HEAD(&host->cards); | |
1177 | INIT_WORK(&host->detect, mmc_rescan, host); | |
1178 | ||
1da177e4 LT |
1179 | /* |
1180 | * By default, hosts do not support SGIO or large requests. | |
1181 | * They have to set these according to their abilities. | |
1182 | */ | |
1183 | host->max_hw_segs = 1; | |
1184 | host->max_phys_segs = 1; | |
1185 | host->max_sectors = 1 << (PAGE_CACHE_SHIFT - 9); | |
1186 | host->max_seg_size = PAGE_CACHE_SIZE; | |
1187 | } | |
1188 | ||
1189 | return host; | |
1190 | } | |
1191 | ||
1192 | EXPORT_SYMBOL(mmc_alloc_host); | |
1193 | ||
1194 | /** | |
1195 | * mmc_add_host - initialise host hardware | |
1196 | * @host: mmc host | |
1197 | */ | |
1198 | int mmc_add_host(struct mmc_host *host) | |
1199 | { | |
00b137cf | 1200 | int ret; |
1da177e4 | 1201 | |
00b137cf RK |
1202 | ret = mmc_add_host_sysfs(host); |
1203 | if (ret == 0) { | |
1204 | mmc_power_off(host); | |
8dc00335 | 1205 | mmc_detect_change(host, 0); |
00b137cf | 1206 | } |
1da177e4 | 1207 | |
00b137cf | 1208 | return ret; |
1da177e4 LT |
1209 | } |
1210 | ||
1211 | EXPORT_SYMBOL(mmc_add_host); | |
1212 | ||
1213 | /** | |
1214 | * mmc_remove_host - remove host hardware | |
1215 | * @host: mmc host | |
1216 | * | |
1217 | * Unregister and remove all cards associated with this host, | |
1218 | * and power down the MMC bus. | |
1219 | */ | |
1220 | void mmc_remove_host(struct mmc_host *host) | |
1221 | { | |
1222 | struct list_head *l, *n; | |
1223 | ||
1224 | list_for_each_safe(l, n, &host->cards) { | |
1225 | struct mmc_card *card = mmc_list_to_card(l); | |
1226 | ||
1227 | mmc_remove_card(card); | |
1228 | } | |
1229 | ||
1230 | mmc_power_off(host); | |
00b137cf | 1231 | mmc_remove_host_sysfs(host); |
1da177e4 LT |
1232 | } |
1233 | ||
1234 | EXPORT_SYMBOL(mmc_remove_host); | |
1235 | ||
1236 | /** | |
1237 | * mmc_free_host - free the host structure | |
1238 | * @host: mmc host | |
1239 | * | |
1240 | * Free the host once all references to it have been dropped. | |
1241 | */ | |
1242 | void mmc_free_host(struct mmc_host *host) | |
1243 | { | |
1244 | flush_scheduled_work(); | |
00b137cf | 1245 | mmc_free_host_sysfs(host); |
1da177e4 LT |
1246 | } |
1247 | ||
1248 | EXPORT_SYMBOL(mmc_free_host); | |
1249 | ||
1250 | #ifdef CONFIG_PM | |
1251 | ||
1252 | /** | |
1253 | * mmc_suspend_host - suspend a host | |
1254 | * @host: mmc host | |
1255 | * @state: suspend mode (PM_SUSPEND_xxx) | |
1256 | */ | |
e5378ca8 | 1257 | int mmc_suspend_host(struct mmc_host *host, pm_message_t state) |
1da177e4 LT |
1258 | { |
1259 | mmc_claim_host(host); | |
1260 | mmc_deselect_cards(host); | |
1261 | mmc_power_off(host); | |
1262 | mmc_release_host(host); | |
1263 | ||
1264 | return 0; | |
1265 | } | |
1266 | ||
1267 | EXPORT_SYMBOL(mmc_suspend_host); | |
1268 | ||
1269 | /** | |
1270 | * mmc_resume_host - resume a previously suspended host | |
1271 | * @host: mmc host | |
1272 | */ | |
1273 | int mmc_resume_host(struct mmc_host *host) | |
1274 | { | |
896937ad | 1275 | mmc_rescan(host); |
1da177e4 LT |
1276 | |
1277 | return 0; | |
1278 | } | |
1279 | ||
1280 | EXPORT_SYMBOL(mmc_resume_host); | |
1281 | ||
1282 | #endif | |
1283 | ||
1284 | MODULE_LICENSE("GPL"); |