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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 | ||
1da177e4 LT |
30 | #define CMD_RETRIES 3 |
31 | ||
32 | /* | |
33 | * OCR Bit positions to 10s of Vdd mV. | |
34 | */ | |
35 | static const unsigned short mmc_ocr_bit_to_vdd[] = { | |
36 | 150, 155, 160, 165, 170, 180, 190, 200, | |
37 | 210, 220, 230, 240, 250, 260, 270, 280, | |
38 | 290, 300, 310, 320, 330, 340, 350, 360 | |
39 | }; | |
40 | ||
41 | static const unsigned int tran_exp[] = { | |
42 | 10000, 100000, 1000000, 10000000, | |
43 | 0, 0, 0, 0 | |
44 | }; | |
45 | ||
46 | static const unsigned char tran_mant[] = { | |
47 | 0, 10, 12, 13, 15, 20, 25, 30, | |
48 | 35, 40, 45, 50, 55, 60, 70, 80, | |
49 | }; | |
50 | ||
51 | static const unsigned int tacc_exp[] = { | |
52 | 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, | |
53 | }; | |
54 | ||
55 | static const unsigned int tacc_mant[] = { | |
56 | 0, 10, 12, 13, 15, 20, 25, 30, | |
57 | 35, 40, 45, 50, 55, 60, 70, 80, | |
58 | }; | |
59 | ||
60 | ||
61 | /** | |
62 | * mmc_request_done - finish processing an MMC command | |
63 | * @host: MMC host which completed command | |
64 | * @mrq: MMC request which completed | |
65 | * | |
66 | * MMC drivers should call this function when they have completed | |
67 | * their processing of a command. This should be called before the | |
68 | * data part of the command has completed. | |
69 | */ | |
70 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
71 | { | |
72 | struct mmc_command *cmd = mrq->cmd; | |
73 | int err = mrq->cmd->error; | |
c6563178 RK |
74 | pr_debug("MMC: req done (%02x): %d: %08x %08x %08x %08x\n", |
75 | cmd->opcode, err, cmd->resp[0], cmd->resp[1], | |
76 | cmd->resp[2], cmd->resp[3]); | |
1da177e4 LT |
77 | |
78 | if (err && cmd->retries) { | |
79 | cmd->retries--; | |
80 | cmd->error = 0; | |
81 | host->ops->request(host, mrq); | |
82 | } else if (mrq->done) { | |
83 | mrq->done(mrq); | |
84 | } | |
85 | } | |
86 | ||
87 | EXPORT_SYMBOL(mmc_request_done); | |
88 | ||
89 | /** | |
90 | * mmc_start_request - start a command on a host | |
91 | * @host: MMC host to start command on | |
92 | * @mrq: MMC request to start | |
93 | * | |
94 | * Queue a command on the specified host. We expect the | |
95 | * caller to be holding the host lock with interrupts disabled. | |
96 | */ | |
97 | void | |
98 | mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) | |
99 | { | |
c6563178 RK |
100 | pr_debug("MMC: starting cmd %02x arg %08x flags %08x\n", |
101 | mrq->cmd->opcode, mrq->cmd->arg, mrq->cmd->flags); | |
1da177e4 LT |
102 | |
103 | WARN_ON(host->card_busy == NULL); | |
104 | ||
105 | mrq->cmd->error = 0; | |
106 | mrq->cmd->mrq = mrq; | |
107 | if (mrq->data) { | |
108 | mrq->cmd->data = mrq->data; | |
109 | mrq->data->error = 0; | |
110 | mrq->data->mrq = mrq; | |
111 | if (mrq->stop) { | |
112 | mrq->data->stop = mrq->stop; | |
113 | mrq->stop->error = 0; | |
114 | mrq->stop->mrq = mrq; | |
115 | } | |
116 | } | |
117 | host->ops->request(host, mrq); | |
118 | } | |
119 | ||
120 | EXPORT_SYMBOL(mmc_start_request); | |
121 | ||
122 | static void mmc_wait_done(struct mmc_request *mrq) | |
123 | { | |
124 | complete(mrq->done_data); | |
125 | } | |
126 | ||
127 | int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
128 | { | |
129 | DECLARE_COMPLETION(complete); | |
130 | ||
131 | mrq->done_data = &complete; | |
132 | mrq->done = mmc_wait_done; | |
133 | ||
134 | mmc_start_request(host, mrq); | |
135 | ||
136 | wait_for_completion(&complete); | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
141 | EXPORT_SYMBOL(mmc_wait_for_req); | |
142 | ||
143 | /** | |
144 | * mmc_wait_for_cmd - start a command and wait for completion | |
145 | * @host: MMC host to start command | |
146 | * @cmd: MMC command to start | |
147 | * @retries: maximum number of retries | |
148 | * | |
149 | * Start a new MMC command for a host, and wait for the command | |
150 | * to complete. Return any error that occurred while the command | |
151 | * was executing. Do not attempt to parse the response. | |
152 | */ | |
153 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
154 | { | |
155 | struct mmc_request mrq; | |
156 | ||
157 | BUG_ON(host->card_busy == NULL); | |
158 | ||
159 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
160 | ||
161 | memset(cmd->resp, 0, sizeof(cmd->resp)); | |
162 | cmd->retries = retries; | |
163 | ||
164 | mrq.cmd = cmd; | |
165 | cmd->data = NULL; | |
166 | ||
167 | mmc_wait_for_req(host, &mrq); | |
168 | ||
169 | return cmd->error; | |
170 | } | |
171 | ||
172 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
173 | ||
335eadf2 PO |
174 | /** |
175 | * mmc_wait_for_app_cmd - start an application command and wait for | |
176 | completion | |
177 | * @host: MMC host to start command | |
178 | * @rca: RCA to send MMC_APP_CMD to | |
179 | * @cmd: MMC command to start | |
180 | * @retries: maximum number of retries | |
181 | * | |
182 | * Sends a MMC_APP_CMD, checks the card response, sends the command | |
183 | * in the parameter and waits for it to complete. Return any error | |
184 | * that occurred while the command was executing. Do not attempt to | |
185 | * parse the response. | |
186 | */ | |
187 | int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca, | |
188 | struct mmc_command *cmd, int retries) | |
189 | { | |
190 | struct mmc_request mrq; | |
191 | struct mmc_command appcmd; | |
192 | ||
193 | int i, err; | |
194 | ||
195 | BUG_ON(host->card_busy == NULL); | |
196 | BUG_ON(retries < 0); | |
197 | ||
198 | err = MMC_ERR_INVALID; | |
199 | ||
200 | /* | |
201 | * We have to resend MMC_APP_CMD for each attempt so | |
202 | * we cannot use the retries field in mmc_command. | |
203 | */ | |
204 | for (i = 0;i <= retries;i++) { | |
205 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
206 | ||
207 | appcmd.opcode = MMC_APP_CMD; | |
208 | appcmd.arg = rca << 16; | |
e9225176 | 209 | appcmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
335eadf2 PO |
210 | appcmd.retries = 0; |
211 | memset(appcmd.resp, 0, sizeof(appcmd.resp)); | |
212 | appcmd.data = NULL; | |
213 | ||
214 | mrq.cmd = &appcmd; | |
215 | appcmd.data = NULL; | |
216 | ||
217 | mmc_wait_for_req(host, &mrq); | |
218 | ||
219 | if (appcmd.error) { | |
220 | err = appcmd.error; | |
221 | continue; | |
222 | } | |
223 | ||
224 | /* Check that card supported application commands */ | |
225 | if (!(appcmd.resp[0] & R1_APP_CMD)) | |
226 | return MMC_ERR_FAILED; | |
227 | ||
228 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
229 | ||
230 | memset(cmd->resp, 0, sizeof(cmd->resp)); | |
231 | cmd->retries = 0; | |
232 | ||
233 | mrq.cmd = cmd; | |
234 | cmd->data = NULL; | |
1da177e4 | 235 | |
335eadf2 PO |
236 | mmc_wait_for_req(host, &mrq); |
237 | ||
238 | err = cmd->error; | |
239 | if (cmd->error == MMC_ERR_NONE) | |
240 | break; | |
241 | } | |
242 | ||
243 | return err; | |
244 | } | |
245 | ||
246 | EXPORT_SYMBOL(mmc_wait_for_app_cmd); | |
1da177e4 | 247 | |
b57c43ad PO |
248 | static int mmc_select_card(struct mmc_host *host, struct mmc_card *card); |
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 | */ | |
261 | int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card) | |
262 | { | |
263 | DECLARE_WAITQUEUE(wait, current); | |
264 | unsigned long flags; | |
265 | int err = 0; | |
266 | ||
267 | add_wait_queue(&host->wq, &wait); | |
268 | spin_lock_irqsave(&host->lock, flags); | |
269 | while (1) { | |
270 | set_current_state(TASK_UNINTERRUPTIBLE); | |
271 | if (host->card_busy == NULL) | |
272 | break; | |
273 | spin_unlock_irqrestore(&host->lock, flags); | |
274 | schedule(); | |
275 | spin_lock_irqsave(&host->lock, flags); | |
276 | } | |
277 | set_current_state(TASK_RUNNING); | |
278 | host->card_busy = card; | |
279 | spin_unlock_irqrestore(&host->lock, flags); | |
280 | remove_wait_queue(&host->wq, &wait); | |
281 | ||
b57c43ad PO |
282 | if (card != (void *)-1) { |
283 | err = mmc_select_card(host, card); | |
284 | if (err != MMC_ERR_NONE) | |
285 | return err; | |
1da177e4 LT |
286 | } |
287 | ||
288 | return err; | |
289 | } | |
290 | ||
291 | EXPORT_SYMBOL(__mmc_claim_host); | |
292 | ||
293 | /** | |
294 | * mmc_release_host - release a host | |
295 | * @host: mmc host to release | |
296 | * | |
297 | * Release a MMC host, allowing others to claim the host | |
298 | * for their operations. | |
299 | */ | |
300 | void mmc_release_host(struct mmc_host *host) | |
301 | { | |
302 | unsigned long flags; | |
303 | ||
304 | BUG_ON(host->card_busy == NULL); | |
305 | ||
306 | spin_lock_irqsave(&host->lock, flags); | |
307 | host->card_busy = NULL; | |
308 | spin_unlock_irqrestore(&host->lock, flags); | |
309 | ||
310 | wake_up(&host->wq); | |
311 | } | |
312 | ||
313 | EXPORT_SYMBOL(mmc_release_host); | |
314 | ||
b57c43ad PO |
315 | static int mmc_select_card(struct mmc_host *host, struct mmc_card *card) |
316 | { | |
317 | int err; | |
318 | struct mmc_command cmd; | |
319 | ||
320 | BUG_ON(host->card_busy == NULL); | |
321 | ||
322 | if (host->card_selected == card) | |
323 | return MMC_ERR_NONE; | |
324 | ||
325 | host->card_selected = card; | |
326 | ||
327 | cmd.opcode = MMC_SELECT_CARD; | |
328 | cmd.arg = card->rca << 16; | |
e9225176 | 329 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
b57c43ad PO |
330 | |
331 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
332 | if (err != MMC_ERR_NONE) | |
333 | return err; | |
334 | ||
f218278a PO |
335 | /* |
336 | * Default bus width is 1 bit. | |
337 | */ | |
338 | host->ios.bus_width = MMC_BUS_WIDTH_1; | |
339 | ||
340 | /* | |
341 | * We can only change the bus width of the selected | |
342 | * card so therefore we have to put the handling | |
343 | * here. | |
344 | */ | |
345 | if (host->caps & MMC_CAP_4_BIT_DATA) { | |
346 | /* | |
347 | * The card is in 1 bit mode by default so | |
348 | * we only need to change if it supports the | |
349 | * wider version. | |
350 | */ | |
351 | if (mmc_card_sd(card) && | |
352 | (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { | |
353 | struct mmc_command cmd; | |
354 | cmd.opcode = SD_APP_SET_BUS_WIDTH; | |
355 | cmd.arg = SD_BUS_WIDTH_4; | |
e9225176 | 356 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
f218278a PO |
357 | |
358 | err = mmc_wait_for_app_cmd(host, card->rca, &cmd, | |
359 | CMD_RETRIES); | |
360 | if (err != MMC_ERR_NONE) | |
361 | return err; | |
362 | ||
363 | host->ios.bus_width = MMC_BUS_WIDTH_4; | |
364 | } | |
365 | } | |
366 | ||
367 | host->ops->set_ios(host, &host->ios); | |
368 | ||
b57c43ad PO |
369 | return MMC_ERR_NONE; |
370 | } | |
371 | ||
1da177e4 LT |
372 | /* |
373 | * Ensure that no card is selected. | |
374 | */ | |
375 | static void mmc_deselect_cards(struct mmc_host *host) | |
376 | { | |
377 | struct mmc_command cmd; | |
378 | ||
379 | if (host->card_selected) { | |
380 | host->card_selected = NULL; | |
381 | ||
382 | cmd.opcode = MMC_SELECT_CARD; | |
383 | cmd.arg = 0; | |
e9225176 | 384 | cmd.flags = MMC_RSP_NONE | MMC_CMD_AC; |
1da177e4 LT |
385 | |
386 | mmc_wait_for_cmd(host, &cmd, 0); | |
387 | } | |
388 | } | |
389 | ||
390 | ||
391 | static inline void mmc_delay(unsigned int ms) | |
392 | { | |
393 | if (ms < HZ / 1000) { | |
394 | yield(); | |
395 | mdelay(ms); | |
396 | } else { | |
397 | msleep_interruptible (ms); | |
398 | } | |
399 | } | |
400 | ||
401 | /* | |
402 | * Mask off any voltages we don't support and select | |
403 | * the lowest voltage | |
404 | */ | |
405 | static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) | |
406 | { | |
407 | int bit; | |
408 | ||
409 | ocr &= host->ocr_avail; | |
410 | ||
411 | bit = ffs(ocr); | |
412 | if (bit) { | |
413 | bit -= 1; | |
414 | ||
415 | ocr = 3 << bit; | |
416 | ||
417 | host->ios.vdd = bit; | |
418 | host->ops->set_ios(host, &host->ios); | |
419 | } else { | |
420 | ocr = 0; | |
421 | } | |
422 | ||
423 | return ocr; | |
424 | } | |
425 | ||
426 | #define UNSTUFF_BITS(resp,start,size) \ | |
427 | ({ \ | |
428 | const int __size = size; \ | |
429 | const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ | |
430 | const int __off = 3 - ((start) / 32); \ | |
431 | const int __shft = (start) & 31; \ | |
432 | u32 __res; \ | |
433 | \ | |
434 | __res = resp[__off] >> __shft; \ | |
435 | if (__size + __shft > 32) \ | |
436 | __res |= resp[__off-1] << ((32 - __shft) % 32); \ | |
437 | __res & __mask; \ | |
438 | }) | |
439 | ||
440 | /* | |
441 | * Given the decoded CSD structure, decode the raw CID to our CID structure. | |
442 | */ | |
443 | static void mmc_decode_cid(struct mmc_card *card) | |
444 | { | |
445 | u32 *resp = card->raw_cid; | |
446 | ||
447 | memset(&card->cid, 0, sizeof(struct mmc_cid)); | |
448 | ||
335eadf2 PO |
449 | if (mmc_card_sd(card)) { |
450 | /* | |
451 | * SD doesn't currently have a version field so we will | |
452 | * have to assume we can parse this. | |
453 | */ | |
454 | card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); | |
455 | card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); | |
456 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
457 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
458 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
459 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
460 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
461 | card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); | |
462 | card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); | |
463 | card->cid.serial = UNSTUFF_BITS(resp, 24, 32); | |
464 | card->cid.year = UNSTUFF_BITS(resp, 12, 8); | |
465 | card->cid.month = UNSTUFF_BITS(resp, 8, 4); | |
466 | ||
467 | card->cid.year += 2000; /* SD cards year offset */ | |
a00fc090 | 468 | } else { |
335eadf2 PO |
469 | /* |
470 | * The selection of the format here is based upon published | |
471 | * specs from sandisk and from what people have reported. | |
472 | */ | |
473 | switch (card->csd.mmca_vsn) { | |
474 | case 0: /* MMC v1.0 - v1.2 */ | |
475 | case 1: /* MMC v1.4 */ | |
476 | card->cid.manfid = UNSTUFF_BITS(resp, 104, 24); | |
477 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
478 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
479 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
480 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
481 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
482 | card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); | |
483 | card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8); | |
484 | card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4); | |
485 | card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4); | |
486 | card->cid.serial = UNSTUFF_BITS(resp, 16, 24); | |
487 | card->cid.month = UNSTUFF_BITS(resp, 12, 4); | |
488 | card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; | |
489 | break; | |
490 | ||
491 | case 2: /* MMC v2.0 - v2.2 */ | |
492 | case 3: /* MMC v3.1 - v3.3 */ | |
cb757b4e | 493 | case 4: /* MMC v4 */ |
335eadf2 PO |
494 | card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); |
495 | card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); | |
496 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
497 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
498 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
499 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
500 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
501 | card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); | |
502 | card->cid.serial = UNSTUFF_BITS(resp, 16, 32); | |
503 | card->cid.month = UNSTUFF_BITS(resp, 12, 4); | |
504 | card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; | |
505 | break; | |
506 | ||
507 | default: | |
508 | printk("%s: card has unknown MMCA version %d\n", | |
509 | mmc_hostname(card->host), card->csd.mmca_vsn); | |
510 | mmc_card_set_bad(card); | |
511 | break; | |
512 | } | |
1da177e4 LT |
513 | } |
514 | } | |
515 | ||
516 | /* | |
517 | * Given a 128-bit response, decode to our card CSD structure. | |
518 | */ | |
519 | static void mmc_decode_csd(struct mmc_card *card) | |
520 | { | |
521 | struct mmc_csd *csd = &card->csd; | |
522 | unsigned int e, m, csd_struct; | |
523 | u32 *resp = card->raw_csd; | |
524 | ||
335eadf2 PO |
525 | if (mmc_card_sd(card)) { |
526 | csd_struct = UNSTUFF_BITS(resp, 126, 2); | |
527 | if (csd_struct != 0) { | |
528 | printk("%s: unrecognised CSD structure version %d\n", | |
529 | mmc_hostname(card->host), csd_struct); | |
530 | mmc_card_set_bad(card); | |
531 | return; | |
532 | } | |
533 | ||
534 | m = UNSTUFF_BITS(resp, 115, 4); | |
535 | e = UNSTUFF_BITS(resp, 112, 3); | |
536 | csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; | |
537 | csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; | |
538 | ||
539 | m = UNSTUFF_BITS(resp, 99, 4); | |
540 | e = UNSTUFF_BITS(resp, 96, 3); | |
541 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
542 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
543 | ||
544 | e = UNSTUFF_BITS(resp, 47, 3); | |
545 | m = UNSTUFF_BITS(resp, 62, 12); | |
546 | csd->capacity = (1 + m) << (e + 2); | |
547 | ||
548 | csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); | |
a6f6c96b RK |
549 | csd->read_partial = UNSTUFF_BITS(resp, 79, 1); |
550 | csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); | |
551 | csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); | |
37be4e78 | 552 | csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); |
a6f6c96b RK |
553 | csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); |
554 | csd->write_partial = UNSTUFF_BITS(resp, 21, 1); | |
a00fc090 | 555 | } else { |
335eadf2 PO |
556 | /* |
557 | * We only understand CSD structure v1.1 and v1.2. | |
558 | * v1.2 has extra information in bits 15, 11 and 10. | |
559 | */ | |
560 | csd_struct = UNSTUFF_BITS(resp, 126, 2); | |
561 | if (csd_struct != 1 && csd_struct != 2) { | |
562 | printk("%s: unrecognised CSD structure version %d\n", | |
563 | mmc_hostname(card->host), csd_struct); | |
564 | mmc_card_set_bad(card); | |
565 | return; | |
566 | } | |
1da177e4 | 567 | |
335eadf2 PO |
568 | csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4); |
569 | m = UNSTUFF_BITS(resp, 115, 4); | |
570 | e = UNSTUFF_BITS(resp, 112, 3); | |
571 | csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; | |
572 | csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; | |
1da177e4 | 573 | |
335eadf2 PO |
574 | m = UNSTUFF_BITS(resp, 99, 4); |
575 | e = UNSTUFF_BITS(resp, 96, 3); | |
576 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
577 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
1da177e4 | 578 | |
335eadf2 PO |
579 | e = UNSTUFF_BITS(resp, 47, 3); |
580 | m = UNSTUFF_BITS(resp, 62, 12); | |
581 | csd->capacity = (1 + m) << (e + 2); | |
1da177e4 | 582 | |
335eadf2 | 583 | csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); |
a6f6c96b RK |
584 | csd->read_partial = UNSTUFF_BITS(resp, 79, 1); |
585 | csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); | |
586 | csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); | |
37be4e78 | 587 | csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); |
a6f6c96b RK |
588 | csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); |
589 | csd->write_partial = UNSTUFF_BITS(resp, 21, 1); | |
335eadf2 | 590 | } |
1da177e4 LT |
591 | } |
592 | ||
b57c43ad PO |
593 | /* |
594 | * Given a 64-bit response, decode to our card SCR structure. | |
595 | */ | |
596 | static void mmc_decode_scr(struct mmc_card *card) | |
597 | { | |
598 | struct sd_scr *scr = &card->scr; | |
599 | unsigned int scr_struct; | |
600 | u32 resp[4]; | |
601 | ||
602 | BUG_ON(!mmc_card_sd(card)); | |
603 | ||
604 | resp[3] = card->raw_scr[1]; | |
605 | resp[2] = card->raw_scr[0]; | |
606 | ||
607 | scr_struct = UNSTUFF_BITS(resp, 60, 4); | |
608 | if (scr_struct != 0) { | |
609 | printk("%s: unrecognised SCR structure version %d\n", | |
610 | mmc_hostname(card->host), scr_struct); | |
611 | mmc_card_set_bad(card); | |
612 | return; | |
613 | } | |
614 | ||
615 | scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); | |
616 | scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); | |
617 | } | |
618 | ||
1da177e4 LT |
619 | /* |
620 | * Locate a MMC card on this MMC host given a raw CID. | |
621 | */ | |
622 | static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid) | |
623 | { | |
624 | struct mmc_card *card; | |
625 | ||
626 | list_for_each_entry(card, &host->cards, node) { | |
627 | if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0) | |
628 | return card; | |
629 | } | |
630 | return NULL; | |
631 | } | |
632 | ||
633 | /* | |
634 | * Allocate a new MMC card, and assign a unique RCA. | |
635 | */ | |
636 | static struct mmc_card * | |
637 | mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca) | |
638 | { | |
639 | struct mmc_card *card, *c; | |
640 | unsigned int rca = *frca; | |
641 | ||
642 | card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL); | |
643 | if (!card) | |
644 | return ERR_PTR(-ENOMEM); | |
645 | ||
646 | mmc_init_card(card, host); | |
647 | memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid)); | |
648 | ||
649 | again: | |
650 | list_for_each_entry(c, &host->cards, node) | |
651 | if (c->rca == rca) { | |
652 | rca++; | |
653 | goto again; | |
654 | } | |
655 | ||
656 | card->rca = rca; | |
657 | ||
658 | *frca = rca; | |
659 | ||
660 | return card; | |
661 | } | |
662 | ||
663 | /* | |
664 | * Tell attached cards to go to IDLE state | |
665 | */ | |
666 | static void mmc_idle_cards(struct mmc_host *host) | |
667 | { | |
668 | struct mmc_command cmd; | |
669 | ||
865e9f13 PO |
670 | host->ios.chip_select = MMC_CS_HIGH; |
671 | host->ops->set_ios(host, &host->ios); | |
672 | ||
673 | mmc_delay(1); | |
674 | ||
1da177e4 LT |
675 | cmd.opcode = MMC_GO_IDLE_STATE; |
676 | cmd.arg = 0; | |
e9225176 | 677 | cmd.flags = MMC_RSP_NONE | MMC_CMD_BC; |
1da177e4 LT |
678 | |
679 | mmc_wait_for_cmd(host, &cmd, 0); | |
680 | ||
681 | mmc_delay(1); | |
865e9f13 PO |
682 | |
683 | host->ios.chip_select = MMC_CS_DONTCARE; | |
684 | host->ops->set_ios(host, &host->ios); | |
685 | ||
686 | mmc_delay(1); | |
1da177e4 LT |
687 | } |
688 | ||
689 | /* | |
45f8245b RK |
690 | * Apply power to the MMC stack. This is a two-stage process. |
691 | * First, we enable power to the card without the clock running. | |
692 | * We then wait a bit for the power to stabilise. Finally, | |
693 | * enable the bus drivers and clock to the card. | |
694 | * | |
695 | * We must _NOT_ enable the clock prior to power stablising. | |
696 | * | |
697 | * If a host does all the power sequencing itself, ignore the | |
698 | * initial MMC_POWER_UP stage. | |
1da177e4 LT |
699 | */ |
700 | static void mmc_power_up(struct mmc_host *host) | |
701 | { | |
702 | int bit = fls(host->ocr_avail) - 1; | |
703 | ||
704 | host->ios.vdd = bit; | |
705 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
865e9f13 | 706 | host->ios.chip_select = MMC_CS_DONTCARE; |
1da177e4 | 707 | host->ios.power_mode = MMC_POWER_UP; |
f218278a | 708 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
1da177e4 LT |
709 | host->ops->set_ios(host, &host->ios); |
710 | ||
711 | mmc_delay(1); | |
712 | ||
713 | host->ios.clock = host->f_min; | |
714 | host->ios.power_mode = MMC_POWER_ON; | |
715 | host->ops->set_ios(host, &host->ios); | |
716 | ||
717 | mmc_delay(2); | |
718 | } | |
719 | ||
720 | static void mmc_power_off(struct mmc_host *host) | |
721 | { | |
722 | host->ios.clock = 0; | |
723 | host->ios.vdd = 0; | |
724 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
865e9f13 | 725 | host->ios.chip_select = MMC_CS_DONTCARE; |
1da177e4 | 726 | host->ios.power_mode = MMC_POWER_OFF; |
f218278a | 727 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
1da177e4 LT |
728 | host->ops->set_ios(host, &host->ios); |
729 | } | |
730 | ||
731 | static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) | |
732 | { | |
733 | struct mmc_command cmd; | |
734 | int i, err = 0; | |
735 | ||
736 | cmd.opcode = MMC_SEND_OP_COND; | |
737 | cmd.arg = ocr; | |
e9225176 | 738 | cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR; |
1da177e4 LT |
739 | |
740 | for (i = 100; i; i--) { | |
741 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
742 | if (err != MMC_ERR_NONE) | |
743 | break; | |
744 | ||
745 | if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0) | |
746 | break; | |
747 | ||
748 | err = MMC_ERR_TIMEOUT; | |
749 | ||
750 | mmc_delay(10); | |
751 | } | |
752 | ||
753 | if (rocr) | |
754 | *rocr = cmd.resp[0]; | |
755 | ||
756 | return err; | |
757 | } | |
758 | ||
335eadf2 PO |
759 | static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) |
760 | { | |
761 | struct mmc_command cmd; | |
762 | int i, err = 0; | |
763 | ||
764 | cmd.opcode = SD_APP_OP_COND; | |
765 | cmd.arg = ocr; | |
e9225176 | 766 | cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR; |
335eadf2 PO |
767 | |
768 | for (i = 100; i; i--) { | |
769 | err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES); | |
770 | if (err != MMC_ERR_NONE) | |
771 | break; | |
772 | ||
773 | if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0) | |
774 | break; | |
775 | ||
776 | err = MMC_ERR_TIMEOUT; | |
777 | ||
778 | mmc_delay(10); | |
779 | } | |
780 | ||
781 | if (rocr) | |
782 | *rocr = cmd.resp[0]; | |
783 | ||
784 | return err; | |
785 | } | |
786 | ||
1da177e4 LT |
787 | /* |
788 | * Discover cards by requesting their CID. If this command | |
789 | * times out, it is not an error; there are no further cards | |
790 | * to be discovered. Add new cards to the list. | |
791 | * | |
792 | * Create a mmc_card entry for each discovered card, assigning | |
793 | * it an RCA, and save the raw CID for decoding later. | |
794 | */ | |
795 | static void mmc_discover_cards(struct mmc_host *host) | |
796 | { | |
797 | struct mmc_card *card; | |
798 | unsigned int first_rca = 1, err; | |
799 | ||
800 | while (1) { | |
801 | struct mmc_command cmd; | |
802 | ||
803 | cmd.opcode = MMC_ALL_SEND_CID; | |
804 | cmd.arg = 0; | |
e9225176 | 805 | cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR; |
1da177e4 LT |
806 | |
807 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
808 | if (err == MMC_ERR_TIMEOUT) { | |
809 | err = MMC_ERR_NONE; | |
810 | break; | |
811 | } | |
812 | if (err != MMC_ERR_NONE) { | |
813 | printk(KERN_ERR "%s: error requesting CID: %d\n", | |
d366b643 | 814 | mmc_hostname(host), err); |
1da177e4 LT |
815 | break; |
816 | } | |
817 | ||
818 | card = mmc_find_card(host, cmd.resp); | |
819 | if (!card) { | |
820 | card = mmc_alloc_card(host, cmd.resp, &first_rca); | |
821 | if (IS_ERR(card)) { | |
822 | err = PTR_ERR(card); | |
823 | break; | |
824 | } | |
825 | list_add(&card->node, &host->cards); | |
826 | } | |
827 | ||
828 | card->state &= ~MMC_STATE_DEAD; | |
829 | ||
335eadf2 PO |
830 | if (host->mode == MMC_MODE_SD) { |
831 | mmc_card_set_sd(card); | |
1da177e4 | 832 | |
335eadf2 PO |
833 | cmd.opcode = SD_SEND_RELATIVE_ADDR; |
834 | cmd.arg = 0; | |
e9225176 | 835 | cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR; |
335eadf2 PO |
836 | |
837 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
838 | if (err != MMC_ERR_NONE) | |
839 | mmc_card_set_dead(card); | |
a00fc090 | 840 | else { |
335eadf2 | 841 | card->rca = cmd.resp[0] >> 16; |
a00fc090 PO |
842 | |
843 | if (!host->ops->get_ro) { | |
844 | printk(KERN_WARNING "%s: host does not " | |
845 | "support reading read-only " | |
846 | "switch. assuming write-enable.\n", | |
847 | mmc_hostname(host)); | |
848 | } else { | |
849 | if (host->ops->get_ro(host)) | |
850 | mmc_card_set_readonly(card); | |
851 | } | |
852 | } | |
853 | } else { | |
335eadf2 PO |
854 | cmd.opcode = MMC_SET_RELATIVE_ADDR; |
855 | cmd.arg = card->rca << 16; | |
e9225176 | 856 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
335eadf2 PO |
857 | |
858 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
859 | if (err != MMC_ERR_NONE) | |
860 | mmc_card_set_dead(card); | |
861 | } | |
1da177e4 LT |
862 | } |
863 | } | |
864 | ||
865 | static void mmc_read_csds(struct mmc_host *host) | |
866 | { | |
867 | struct mmc_card *card; | |
868 | ||
869 | list_for_each_entry(card, &host->cards, node) { | |
870 | struct mmc_command cmd; | |
871 | int err; | |
872 | ||
873 | if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) | |
874 | continue; | |
875 | ||
876 | cmd.opcode = MMC_SEND_CSD; | |
877 | cmd.arg = card->rca << 16; | |
e9225176 | 878 | cmd.flags = MMC_RSP_R2 | MMC_CMD_AC; |
1da177e4 LT |
879 | |
880 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
881 | if (err != MMC_ERR_NONE) { | |
882 | mmc_card_set_dead(card); | |
883 | continue; | |
884 | } | |
885 | ||
886 | memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd)); | |
887 | ||
888 | mmc_decode_csd(card); | |
889 | mmc_decode_cid(card); | |
890 | } | |
891 | } | |
892 | ||
b57c43ad PO |
893 | static void mmc_read_scrs(struct mmc_host *host) |
894 | { | |
895 | int err; | |
896 | struct mmc_card *card; | |
897 | ||
898 | struct mmc_request mrq; | |
899 | struct mmc_command cmd; | |
900 | struct mmc_data data; | |
901 | ||
902 | struct scatterlist sg; | |
903 | ||
904 | list_for_each_entry(card, &host->cards, node) { | |
905 | if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) | |
906 | continue; | |
907 | if (!mmc_card_sd(card)) | |
908 | continue; | |
909 | ||
910 | err = mmc_select_card(host, card); | |
911 | if (err != MMC_ERR_NONE) { | |
912 | mmc_card_set_dead(card); | |
913 | continue; | |
914 | } | |
915 | ||
916 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
917 | ||
918 | cmd.opcode = MMC_APP_CMD; | |
919 | cmd.arg = card->rca << 16; | |
e9225176 | 920 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
b57c43ad PO |
921 | |
922 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
923 | if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) { | |
924 | mmc_card_set_dead(card); | |
925 | continue; | |
926 | } | |
927 | ||
928 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
929 | ||
930 | cmd.opcode = SD_APP_SEND_SCR; | |
931 | cmd.arg = 0; | |
e9225176 | 932 | cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; |
b57c43ad PO |
933 | |
934 | memset(&data, 0, sizeof(struct mmc_data)); | |
935 | ||
936 | data.timeout_ns = card->csd.tacc_ns * 10; | |
937 | data.timeout_clks = card->csd.tacc_clks * 10; | |
938 | data.blksz_bits = 3; | |
939 | data.blocks = 1; | |
940 | data.flags = MMC_DATA_READ; | |
941 | data.sg = &sg; | |
942 | data.sg_len = 1; | |
943 | ||
944 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
945 | ||
946 | mrq.cmd = &cmd; | |
947 | mrq.data = &data; | |
948 | ||
949 | sg_init_one(&sg, (u8*)card->raw_scr, 8); | |
950 | ||
e781de44 PO |
951 | mmc_wait_for_req(host, &mrq); |
952 | ||
953 | if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) { | |
b57c43ad PO |
954 | mmc_card_set_dead(card); |
955 | continue; | |
956 | } | |
957 | ||
958 | card->raw_scr[0] = ntohl(card->raw_scr[0]); | |
959 | card->raw_scr[1] = ntohl(card->raw_scr[1]); | |
960 | ||
961 | mmc_decode_scr(card); | |
962 | } | |
963 | ||
964 | mmc_deselect_cards(host); | |
965 | } | |
966 | ||
1da177e4 LT |
967 | static unsigned int mmc_calculate_clock(struct mmc_host *host) |
968 | { | |
969 | struct mmc_card *card; | |
970 | unsigned int max_dtr = host->f_max; | |
971 | ||
972 | list_for_each_entry(card, &host->cards, node) | |
973 | if (!mmc_card_dead(card) && max_dtr > card->csd.max_dtr) | |
974 | max_dtr = card->csd.max_dtr; | |
975 | ||
c6563178 RK |
976 | pr_debug("MMC: selected %d.%03dMHz transfer rate\n", |
977 | max_dtr / 1000000, (max_dtr / 1000) % 1000); | |
1da177e4 LT |
978 | |
979 | return max_dtr; | |
980 | } | |
981 | ||
982 | /* | |
983 | * Check whether cards we already know about are still present. | |
984 | * We do this by requesting status, and checking whether a card | |
985 | * responds. | |
986 | * | |
987 | * A request for status does not cause a state change in data | |
988 | * transfer mode. | |
989 | */ | |
990 | static void mmc_check_cards(struct mmc_host *host) | |
991 | { | |
992 | struct list_head *l, *n; | |
993 | ||
994 | mmc_deselect_cards(host); | |
995 | ||
996 | list_for_each_safe(l, n, &host->cards) { | |
997 | struct mmc_card *card = mmc_list_to_card(l); | |
998 | struct mmc_command cmd; | |
999 | int err; | |
1000 | ||
1001 | cmd.opcode = MMC_SEND_STATUS; | |
1002 | cmd.arg = card->rca << 16; | |
e9225176 | 1003 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
1da177e4 LT |
1004 | |
1005 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
1006 | if (err == MMC_ERR_NONE) | |
1007 | continue; | |
1008 | ||
1009 | mmc_card_set_dead(card); | |
1010 | } | |
1011 | } | |
1012 | ||
1013 | static void mmc_setup(struct mmc_host *host) | |
1014 | { | |
1015 | if (host->ios.power_mode != MMC_POWER_ON) { | |
1016 | int err; | |
1017 | u32 ocr; | |
1018 | ||
a00fc090 | 1019 | host->mode = MMC_MODE_SD; |
335eadf2 | 1020 | |
1da177e4 LT |
1021 | mmc_power_up(host); |
1022 | mmc_idle_cards(host); | |
1023 | ||
a00fc090 | 1024 | err = mmc_send_app_op_cond(host, 0, &ocr); |
335eadf2 PO |
1025 | |
1026 | /* | |
a00fc090 PO |
1027 | * If we fail to detect any SD cards then try |
1028 | * searching for MMC cards. | |
335eadf2 | 1029 | */ |
a00fc090 PO |
1030 | if (err != MMC_ERR_NONE) { |
1031 | host->mode = MMC_MODE_MMC; | |
1032 | ||
1033 | err = mmc_send_op_cond(host, 0, &ocr); | |
335eadf2 PO |
1034 | if (err != MMC_ERR_NONE) |
1035 | return; | |
335eadf2 | 1036 | } |
1da177e4 LT |
1037 | |
1038 | host->ocr = mmc_select_voltage(host, ocr); | |
1039 | ||
1040 | /* | |
1041 | * Since we're changing the OCR value, we seem to | |
1042 | * need to tell some cards to go back to the idle | |
1043 | * state. We wait 1ms to give cards time to | |
1044 | * respond. | |
1045 | */ | |
1046 | if (host->ocr) | |
1047 | mmc_idle_cards(host); | |
1048 | } else { | |
1049 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
1050 | host->ios.clock = host->f_min; | |
1051 | host->ops->set_ios(host, &host->ios); | |
1052 | ||
1053 | /* | |
1054 | * We should remember the OCR mask from the existing | |
1055 | * cards, and detect the new cards OCR mask, combine | |
1056 | * the two and re-select the VDD. However, if we do | |
1057 | * change VDD, we should do an idle, and then do a | |
1058 | * full re-initialisation. We would need to notify | |
1059 | * drivers so that they can re-setup the cards as | |
1060 | * well, while keeping their queues at bay. | |
1061 | * | |
1062 | * For the moment, we take the easy way out - if the | |
1063 | * new cards don't like our currently selected VDD, | |
1064 | * they drop off the bus. | |
1065 | */ | |
1066 | } | |
1067 | ||
1068 | if (host->ocr == 0) | |
1069 | return; | |
1070 | ||
1071 | /* | |
1072 | * Send the selected OCR multiple times... until the cards | |
1073 | * all get the idea that they should be ready for CMD2. | |
1074 | * (My SanDisk card seems to need this.) | |
1075 | */ | |
335eadf2 PO |
1076 | if (host->mode == MMC_MODE_SD) |
1077 | mmc_send_app_op_cond(host, host->ocr, NULL); | |
1078 | else | |
1079 | mmc_send_op_cond(host, host->ocr, NULL); | |
1da177e4 LT |
1080 | |
1081 | mmc_discover_cards(host); | |
1082 | ||
1083 | /* | |
1084 | * Ok, now switch to push-pull mode. | |
1085 | */ | |
1086 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
1087 | host->ops->set_ios(host, &host->ios); | |
1088 | ||
1089 | mmc_read_csds(host); | |
b57c43ad PO |
1090 | |
1091 | if (host->mode == MMC_MODE_SD) | |
1092 | mmc_read_scrs(host); | |
1da177e4 LT |
1093 | } |
1094 | ||
1095 | ||
1096 | /** | |
1097 | * mmc_detect_change - process change of state on a MMC socket | |
1098 | * @host: host which changed state. | |
8dc00335 | 1099 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 LT |
1100 | * |
1101 | * All we know is that card(s) have been inserted or removed | |
1102 | * from the socket(s). We don't know which socket or cards. | |
1103 | */ | |
8dc00335 | 1104 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 1105 | { |
8dc00335 RP |
1106 | if (delay) |
1107 | schedule_delayed_work(&host->detect, delay); | |
1108 | else | |
1109 | schedule_work(&host->detect); | |
1da177e4 LT |
1110 | } |
1111 | ||
1112 | EXPORT_SYMBOL(mmc_detect_change); | |
1113 | ||
1114 | ||
1115 | static void mmc_rescan(void *data) | |
1116 | { | |
1117 | struct mmc_host *host = data; | |
1118 | struct list_head *l, *n; | |
1119 | ||
1120 | mmc_claim_host(host); | |
1121 | ||
1122 | if (host->ios.power_mode == MMC_POWER_ON) | |
1123 | mmc_check_cards(host); | |
1124 | ||
1125 | mmc_setup(host); | |
1126 | ||
1127 | if (!list_empty(&host->cards)) { | |
1128 | /* | |
1129 | * (Re-)calculate the fastest clock rate which the | |
1130 | * attached cards and the host support. | |
1131 | */ | |
1132 | host->ios.clock = mmc_calculate_clock(host); | |
1133 | host->ops->set_ios(host, &host->ios); | |
1134 | } | |
1135 | ||
1136 | mmc_release_host(host); | |
1137 | ||
1138 | list_for_each_safe(l, n, &host->cards) { | |
1139 | struct mmc_card *card = mmc_list_to_card(l); | |
1140 | ||
1141 | /* | |
1142 | * If this is a new and good card, register it. | |
1143 | */ | |
1144 | if (!mmc_card_present(card) && !mmc_card_dead(card)) { | |
1145 | if (mmc_register_card(card)) | |
1146 | mmc_card_set_dead(card); | |
1147 | else | |
1148 | mmc_card_set_present(card); | |
1149 | } | |
1150 | ||
1151 | /* | |
1152 | * If this card is dead, destroy it. | |
1153 | */ | |
1154 | if (mmc_card_dead(card)) { | |
1155 | list_del(&card->node); | |
1156 | mmc_remove_card(card); | |
1157 | } | |
1158 | } | |
1159 | ||
1160 | /* | |
1161 | * If we discover that there are no cards on the | |
1162 | * bus, turn off the clock and power down. | |
1163 | */ | |
1164 | if (list_empty(&host->cards)) | |
1165 | mmc_power_off(host); | |
1166 | } | |
1167 | ||
1168 | ||
1169 | /** | |
1170 | * mmc_alloc_host - initialise the per-host structure. | |
1171 | * @extra: sizeof private data structure | |
1172 | * @dev: pointer to host device model structure | |
1173 | * | |
1174 | * Initialise the per-host structure. | |
1175 | */ | |
1176 | struct mmc_host *mmc_alloc_host(int extra, struct device *dev) | |
1177 | { | |
1178 | struct mmc_host *host; | |
1179 | ||
00b137cf | 1180 | host = mmc_alloc_host_sysfs(extra, dev); |
1da177e4 | 1181 | if (host) { |
1da177e4 LT |
1182 | spin_lock_init(&host->lock); |
1183 | init_waitqueue_head(&host->wq); | |
1184 | INIT_LIST_HEAD(&host->cards); | |
1185 | INIT_WORK(&host->detect, mmc_rescan, host); | |
1186 | ||
1da177e4 LT |
1187 | /* |
1188 | * By default, hosts do not support SGIO or large requests. | |
1189 | * They have to set these according to their abilities. | |
1190 | */ | |
1191 | host->max_hw_segs = 1; | |
1192 | host->max_phys_segs = 1; | |
1193 | host->max_sectors = 1 << (PAGE_CACHE_SHIFT - 9); | |
1194 | host->max_seg_size = PAGE_CACHE_SIZE; | |
1195 | } | |
1196 | ||
1197 | return host; | |
1198 | } | |
1199 | ||
1200 | EXPORT_SYMBOL(mmc_alloc_host); | |
1201 | ||
1202 | /** | |
1203 | * mmc_add_host - initialise host hardware | |
1204 | * @host: mmc host | |
1205 | */ | |
1206 | int mmc_add_host(struct mmc_host *host) | |
1207 | { | |
00b137cf | 1208 | int ret; |
1da177e4 | 1209 | |
00b137cf RK |
1210 | ret = mmc_add_host_sysfs(host); |
1211 | if (ret == 0) { | |
1212 | mmc_power_off(host); | |
8dc00335 | 1213 | mmc_detect_change(host, 0); |
00b137cf | 1214 | } |
1da177e4 | 1215 | |
00b137cf | 1216 | return ret; |
1da177e4 LT |
1217 | } |
1218 | ||
1219 | EXPORT_SYMBOL(mmc_add_host); | |
1220 | ||
1221 | /** | |
1222 | * mmc_remove_host - remove host hardware | |
1223 | * @host: mmc host | |
1224 | * | |
1225 | * Unregister and remove all cards associated with this host, | |
1226 | * and power down the MMC bus. | |
1227 | */ | |
1228 | void mmc_remove_host(struct mmc_host *host) | |
1229 | { | |
1230 | struct list_head *l, *n; | |
1231 | ||
1232 | list_for_each_safe(l, n, &host->cards) { | |
1233 | struct mmc_card *card = mmc_list_to_card(l); | |
1234 | ||
1235 | mmc_remove_card(card); | |
1236 | } | |
1237 | ||
1238 | mmc_power_off(host); | |
00b137cf | 1239 | mmc_remove_host_sysfs(host); |
1da177e4 LT |
1240 | } |
1241 | ||
1242 | EXPORT_SYMBOL(mmc_remove_host); | |
1243 | ||
1244 | /** | |
1245 | * mmc_free_host - free the host structure | |
1246 | * @host: mmc host | |
1247 | * | |
1248 | * Free the host once all references to it have been dropped. | |
1249 | */ | |
1250 | void mmc_free_host(struct mmc_host *host) | |
1251 | { | |
1252 | flush_scheduled_work(); | |
00b137cf | 1253 | mmc_free_host_sysfs(host); |
1da177e4 LT |
1254 | } |
1255 | ||
1256 | EXPORT_SYMBOL(mmc_free_host); | |
1257 | ||
1258 | #ifdef CONFIG_PM | |
1259 | ||
1260 | /** | |
1261 | * mmc_suspend_host - suspend a host | |
1262 | * @host: mmc host | |
1263 | * @state: suspend mode (PM_SUSPEND_xxx) | |
1264 | */ | |
e5378ca8 | 1265 | int mmc_suspend_host(struct mmc_host *host, pm_message_t state) |
1da177e4 LT |
1266 | { |
1267 | mmc_claim_host(host); | |
1268 | mmc_deselect_cards(host); | |
1269 | mmc_power_off(host); | |
1270 | mmc_release_host(host); | |
1271 | ||
1272 | return 0; | |
1273 | } | |
1274 | ||
1275 | EXPORT_SYMBOL(mmc_suspend_host); | |
1276 | ||
1277 | /** | |
1278 | * mmc_resume_host - resume a previously suspended host | |
1279 | * @host: mmc host | |
1280 | */ | |
1281 | int mmc_resume_host(struct mmc_host *host) | |
1282 | { | |
896937ad | 1283 | mmc_rescan(host); |
1da177e4 LT |
1284 | |
1285 | return 0; | |
1286 | } | |
1287 | ||
1288 | EXPORT_SYMBOL(mmc_resume_host); | |
1289 | ||
1290 | #endif | |
1291 | ||
1292 | MODULE_LICENSE("GPL"); |