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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 | */ | |
1da177e4 LT |
12 | #include <linux/module.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/completion.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/pagemap.h> | |
19 | #include <linux/err.h> | |
b57c43ad PO |
20 | #include <asm/scatterlist.h> |
21 | #include <linux/scatterlist.h> | |
1da177e4 LT |
22 | |
23 | #include <linux/mmc/card.h> | |
24 | #include <linux/mmc/host.h> | |
25 | #include <linux/mmc/protocol.h> | |
26 | ||
27 | #include "mmc.h" | |
28 | ||
1da177e4 LT |
29 | #define CMD_RETRIES 3 |
30 | ||
31 | /* | |
32 | * OCR Bit positions to 10s of Vdd mV. | |
33 | */ | |
34 | static const unsigned short mmc_ocr_bit_to_vdd[] = { | |
35 | 150, 155, 160, 165, 170, 180, 190, 200, | |
36 | 210, 220, 230, 240, 250, 260, 270, 280, | |
37 | 290, 300, 310, 320, 330, 340, 350, 360 | |
38 | }; | |
39 | ||
40 | static const unsigned int tran_exp[] = { | |
41 | 10000, 100000, 1000000, 10000000, | |
42 | 0, 0, 0, 0 | |
43 | }; | |
44 | ||
45 | static const unsigned char tran_mant[] = { | |
46 | 0, 10, 12, 13, 15, 20, 25, 30, | |
47 | 35, 40, 45, 50, 55, 60, 70, 80, | |
48 | }; | |
49 | ||
50 | static const unsigned int tacc_exp[] = { | |
51 | 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, | |
52 | }; | |
53 | ||
54 | static const unsigned int tacc_mant[] = { | |
55 | 0, 10, 12, 13, 15, 20, 25, 30, | |
56 | 35, 40, 45, 50, 55, 60, 70, 80, | |
57 | }; | |
58 | ||
59 | ||
60 | /** | |
fe10c6ab RK |
61 | * mmc_request_done - finish processing an MMC request |
62 | * @host: MMC host which completed request | |
63 | * @mrq: MMC request which request | |
1da177e4 LT |
64 | * |
65 | * MMC drivers should call this function when they have completed | |
fe10c6ab | 66 | * their processing of a request. |
1da177e4 LT |
67 | */ |
68 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
69 | { | |
70 | struct mmc_command *cmd = mrq->cmd; | |
920e70c5 RK |
71 | int err = cmd->error; |
72 | ||
73 | pr_debug("%s: req done (CMD%u): %d/%d/%d: %08x %08x %08x %08x\n", | |
74 | mmc_hostname(host), cmd->opcode, err, | |
75 | mrq->data ? mrq->data->error : 0, | |
76 | mrq->stop ? mrq->stop->error : 0, | |
77 | cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]); | |
1da177e4 LT |
78 | |
79 | if (err && cmd->retries) { | |
80 | cmd->retries--; | |
81 | cmd->error = 0; | |
82 | host->ops->request(host, mrq); | |
83 | } else if (mrq->done) { | |
84 | mrq->done(mrq); | |
85 | } | |
86 | } | |
87 | ||
88 | EXPORT_SYMBOL(mmc_request_done); | |
89 | ||
90 | /** | |
91 | * mmc_start_request - start a command on a host | |
92 | * @host: MMC host to start command on | |
93 | * @mrq: MMC request to start | |
94 | * | |
95 | * Queue a command on the specified host. We expect the | |
96 | * caller to be holding the host lock with interrupts disabled. | |
97 | */ | |
98 | void | |
99 | mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) | |
100 | { | |
920e70c5 RK |
101 | pr_debug("%s: starting CMD%u arg %08x flags %08x\n", |
102 | mmc_hostname(host), mrq->cmd->opcode, | |
103 | mrq->cmd->arg, mrq->cmd->flags); | |
1da177e4 LT |
104 | |
105 | WARN_ON(host->card_busy == NULL); | |
106 | ||
107 | mrq->cmd->error = 0; | |
108 | mrq->cmd->mrq = mrq; | |
109 | if (mrq->data) { | |
110 | mrq->cmd->data = mrq->data; | |
111 | mrq->data->error = 0; | |
112 | mrq->data->mrq = mrq; | |
113 | if (mrq->stop) { | |
114 | mrq->data->stop = mrq->stop; | |
115 | mrq->stop->error = 0; | |
116 | mrq->stop->mrq = mrq; | |
117 | } | |
118 | } | |
119 | host->ops->request(host, mrq); | |
120 | } | |
121 | ||
122 | EXPORT_SYMBOL(mmc_start_request); | |
123 | ||
124 | static void mmc_wait_done(struct mmc_request *mrq) | |
125 | { | |
126 | complete(mrq->done_data); | |
127 | } | |
128 | ||
129 | int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
130 | { | |
0afffc72 | 131 | DECLARE_COMPLETION_ONSTACK(complete); |
1da177e4 LT |
132 | |
133 | mrq->done_data = &complete; | |
134 | mrq->done = mmc_wait_done; | |
135 | ||
136 | mmc_start_request(host, mrq); | |
137 | ||
138 | wait_for_completion(&complete); | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | EXPORT_SYMBOL(mmc_wait_for_req); | |
144 | ||
145 | /** | |
146 | * mmc_wait_for_cmd - start a command and wait for completion | |
147 | * @host: MMC host to start command | |
148 | * @cmd: MMC command to start | |
149 | * @retries: maximum number of retries | |
150 | * | |
151 | * Start a new MMC command for a host, and wait for the command | |
152 | * to complete. Return any error that occurred while the command | |
153 | * was executing. Do not attempt to parse the response. | |
154 | */ | |
155 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
156 | { | |
157 | struct mmc_request mrq; | |
158 | ||
159 | BUG_ON(host->card_busy == NULL); | |
160 | ||
161 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
162 | ||
163 | memset(cmd->resp, 0, sizeof(cmd->resp)); | |
164 | cmd->retries = retries; | |
165 | ||
166 | mrq.cmd = cmd; | |
167 | cmd->data = NULL; | |
168 | ||
169 | mmc_wait_for_req(host, &mrq); | |
170 | ||
171 | return cmd->error; | |
172 | } | |
173 | ||
174 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
175 | ||
335eadf2 PO |
176 | /** |
177 | * mmc_wait_for_app_cmd - start an application command and wait for | |
178 | completion | |
179 | * @host: MMC host to start command | |
180 | * @rca: RCA to send MMC_APP_CMD to | |
181 | * @cmd: MMC command to start | |
182 | * @retries: maximum number of retries | |
183 | * | |
184 | * Sends a MMC_APP_CMD, checks the card response, sends the command | |
185 | * in the parameter and waits for it to complete. Return any error | |
186 | * that occurred while the command was executing. Do not attempt to | |
187 | * parse the response. | |
188 | */ | |
189 | int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca, | |
190 | struct mmc_command *cmd, int retries) | |
191 | { | |
192 | struct mmc_request mrq; | |
193 | struct mmc_command appcmd; | |
194 | ||
195 | int i, err; | |
196 | ||
197 | BUG_ON(host->card_busy == NULL); | |
198 | BUG_ON(retries < 0); | |
199 | ||
200 | err = MMC_ERR_INVALID; | |
201 | ||
202 | /* | |
203 | * We have to resend MMC_APP_CMD for each attempt so | |
204 | * we cannot use the retries field in mmc_command. | |
205 | */ | |
206 | for (i = 0;i <= retries;i++) { | |
207 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
208 | ||
209 | appcmd.opcode = MMC_APP_CMD; | |
210 | appcmd.arg = rca << 16; | |
e9225176 | 211 | appcmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
335eadf2 PO |
212 | appcmd.retries = 0; |
213 | memset(appcmd.resp, 0, sizeof(appcmd.resp)); | |
214 | appcmd.data = NULL; | |
215 | ||
216 | mrq.cmd = &appcmd; | |
217 | appcmd.data = NULL; | |
218 | ||
219 | mmc_wait_for_req(host, &mrq); | |
220 | ||
221 | if (appcmd.error) { | |
222 | err = appcmd.error; | |
223 | continue; | |
224 | } | |
225 | ||
226 | /* Check that card supported application commands */ | |
227 | if (!(appcmd.resp[0] & R1_APP_CMD)) | |
228 | return MMC_ERR_FAILED; | |
229 | ||
230 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
231 | ||
232 | memset(cmd->resp, 0, sizeof(cmd->resp)); | |
233 | cmd->retries = 0; | |
234 | ||
235 | mrq.cmd = cmd; | |
236 | cmd->data = NULL; | |
1da177e4 | 237 | |
335eadf2 PO |
238 | mmc_wait_for_req(host, &mrq); |
239 | ||
240 | err = cmd->error; | |
241 | if (cmd->error == MMC_ERR_NONE) | |
242 | break; | |
243 | } | |
244 | ||
245 | return err; | |
246 | } | |
247 | ||
248 | EXPORT_SYMBOL(mmc_wait_for_app_cmd); | |
1da177e4 | 249 | |
d773d725 RK |
250 | /** |
251 | * mmc_set_data_timeout - set the timeout for a data command | |
252 | * @data: data phase for command | |
253 | * @card: the MMC card associated with the data transfer | |
254 | * @write: flag to differentiate reads from writes | |
255 | */ | |
256 | void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card, | |
257 | int write) | |
258 | { | |
259 | unsigned int mult; | |
260 | ||
261 | /* | |
262 | * SD cards use a 100 multiplier rather than 10 | |
263 | */ | |
264 | mult = mmc_card_sd(card) ? 100 : 10; | |
265 | ||
266 | /* | |
267 | * Scale up the multiplier (and therefore the timeout) by | |
268 | * the r2w factor for writes. | |
269 | */ | |
270 | if (write) | |
271 | mult <<= card->csd.r2w_factor; | |
272 | ||
273 | data->timeout_ns = card->csd.tacc_ns * mult; | |
274 | data->timeout_clks = card->csd.tacc_clks * mult; | |
275 | ||
276 | /* | |
277 | * SD cards also have an upper limit on the timeout. | |
278 | */ | |
279 | if (mmc_card_sd(card)) { | |
280 | unsigned int timeout_us, limit_us; | |
281 | ||
282 | timeout_us = data->timeout_ns / 1000; | |
283 | timeout_us += data->timeout_clks * 1000 / | |
284 | (card->host->ios.clock / 1000); | |
285 | ||
286 | if (write) | |
287 | limit_us = 250000; | |
288 | else | |
289 | limit_us = 100000; | |
290 | ||
291 | if (timeout_us > limit_us) { | |
292 | data->timeout_ns = limit_us * 1000; | |
293 | data->timeout_clks = 0; | |
294 | } | |
295 | } | |
296 | } | |
297 | EXPORT_SYMBOL(mmc_set_data_timeout); | |
298 | ||
b57c43ad PO |
299 | static int mmc_select_card(struct mmc_host *host, struct mmc_card *card); |
300 | ||
1da177e4 LT |
301 | /** |
302 | * __mmc_claim_host - exclusively claim a host | |
303 | * @host: mmc host to claim | |
304 | * @card: mmc card to claim host for | |
305 | * | |
306 | * Claim a host for a set of operations. If a valid card | |
307 | * is passed and this wasn't the last card selected, select | |
308 | * the card before returning. | |
309 | * | |
310 | * Note: you should use mmc_card_claim_host or mmc_claim_host. | |
311 | */ | |
312 | int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card) | |
313 | { | |
314 | DECLARE_WAITQUEUE(wait, current); | |
315 | unsigned long flags; | |
316 | int err = 0; | |
317 | ||
318 | add_wait_queue(&host->wq, &wait); | |
319 | spin_lock_irqsave(&host->lock, flags); | |
320 | while (1) { | |
321 | set_current_state(TASK_UNINTERRUPTIBLE); | |
322 | if (host->card_busy == NULL) | |
323 | break; | |
324 | spin_unlock_irqrestore(&host->lock, flags); | |
325 | schedule(); | |
326 | spin_lock_irqsave(&host->lock, flags); | |
327 | } | |
328 | set_current_state(TASK_RUNNING); | |
329 | host->card_busy = card; | |
330 | spin_unlock_irqrestore(&host->lock, flags); | |
331 | remove_wait_queue(&host->wq, &wait); | |
332 | ||
b57c43ad PO |
333 | if (card != (void *)-1) { |
334 | err = mmc_select_card(host, card); | |
335 | if (err != MMC_ERR_NONE) | |
336 | return err; | |
1da177e4 LT |
337 | } |
338 | ||
339 | return err; | |
340 | } | |
341 | ||
342 | EXPORT_SYMBOL(__mmc_claim_host); | |
343 | ||
344 | /** | |
345 | * mmc_release_host - release a host | |
346 | * @host: mmc host to release | |
347 | * | |
348 | * Release a MMC host, allowing others to claim the host | |
349 | * for their operations. | |
350 | */ | |
351 | void mmc_release_host(struct mmc_host *host) | |
352 | { | |
353 | unsigned long flags; | |
354 | ||
355 | BUG_ON(host->card_busy == NULL); | |
356 | ||
357 | spin_lock_irqsave(&host->lock, flags); | |
358 | host->card_busy = NULL; | |
359 | spin_unlock_irqrestore(&host->lock, flags); | |
360 | ||
361 | wake_up(&host->wq); | |
362 | } | |
363 | ||
364 | EXPORT_SYMBOL(mmc_release_host); | |
365 | ||
920e70c5 RK |
366 | static inline void mmc_set_ios(struct mmc_host *host) |
367 | { | |
368 | struct mmc_ios *ios = &host->ios; | |
369 | ||
370 | pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u width %u\n", | |
371 | mmc_hostname(host), ios->clock, ios->bus_mode, | |
372 | ios->power_mode, ios->chip_select, ios->vdd, | |
373 | ios->bus_width); | |
374 | ||
375 | host->ops->set_ios(host, ios); | |
376 | } | |
377 | ||
b57c43ad PO |
378 | static int mmc_select_card(struct mmc_host *host, struct mmc_card *card) |
379 | { | |
380 | int err; | |
381 | struct mmc_command cmd; | |
382 | ||
383 | BUG_ON(host->card_busy == NULL); | |
384 | ||
385 | if (host->card_selected == card) | |
386 | return MMC_ERR_NONE; | |
387 | ||
388 | host->card_selected = card; | |
389 | ||
390 | cmd.opcode = MMC_SELECT_CARD; | |
391 | cmd.arg = card->rca << 16; | |
e9225176 | 392 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
b57c43ad PO |
393 | |
394 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
395 | if (err != MMC_ERR_NONE) | |
396 | return err; | |
397 | ||
f218278a PO |
398 | /* |
399 | * Default bus width is 1 bit. | |
400 | */ | |
401 | host->ios.bus_width = MMC_BUS_WIDTH_1; | |
402 | ||
403 | /* | |
404 | * We can only change the bus width of the selected | |
405 | * card so therefore we have to put the handling | |
406 | * here. | |
407 | */ | |
408 | if (host->caps & MMC_CAP_4_BIT_DATA) { | |
409 | /* | |
410 | * The card is in 1 bit mode by default so | |
411 | * we only need to change if it supports the | |
412 | * wider version. | |
413 | */ | |
414 | if (mmc_card_sd(card) && | |
415 | (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { | |
416 | struct mmc_command cmd; | |
417 | cmd.opcode = SD_APP_SET_BUS_WIDTH; | |
418 | cmd.arg = SD_BUS_WIDTH_4; | |
e9225176 | 419 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
f218278a PO |
420 | |
421 | err = mmc_wait_for_app_cmd(host, card->rca, &cmd, | |
422 | CMD_RETRIES); | |
423 | if (err != MMC_ERR_NONE) | |
424 | return err; | |
425 | ||
426 | host->ios.bus_width = MMC_BUS_WIDTH_4; | |
427 | } | |
428 | } | |
429 | ||
920e70c5 | 430 | mmc_set_ios(host); |
f218278a | 431 | |
b57c43ad PO |
432 | return MMC_ERR_NONE; |
433 | } | |
434 | ||
1da177e4 LT |
435 | /* |
436 | * Ensure that no card is selected. | |
437 | */ | |
438 | static void mmc_deselect_cards(struct mmc_host *host) | |
439 | { | |
440 | struct mmc_command cmd; | |
441 | ||
442 | if (host->card_selected) { | |
443 | host->card_selected = NULL; | |
444 | ||
445 | cmd.opcode = MMC_SELECT_CARD; | |
446 | cmd.arg = 0; | |
e9225176 | 447 | cmd.flags = MMC_RSP_NONE | MMC_CMD_AC; |
1da177e4 LT |
448 | |
449 | mmc_wait_for_cmd(host, &cmd, 0); | |
450 | } | |
451 | } | |
452 | ||
453 | ||
454 | static inline void mmc_delay(unsigned int ms) | |
455 | { | |
456 | if (ms < HZ / 1000) { | |
457 | yield(); | |
458 | mdelay(ms); | |
459 | } else { | |
460 | msleep_interruptible (ms); | |
461 | } | |
462 | } | |
463 | ||
464 | /* | |
465 | * Mask off any voltages we don't support and select | |
466 | * the lowest voltage | |
467 | */ | |
468 | static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) | |
469 | { | |
470 | int bit; | |
471 | ||
472 | ocr &= host->ocr_avail; | |
473 | ||
474 | bit = ffs(ocr); | |
475 | if (bit) { | |
476 | bit -= 1; | |
477 | ||
478 | ocr = 3 << bit; | |
479 | ||
480 | host->ios.vdd = bit; | |
920e70c5 | 481 | mmc_set_ios(host); |
1da177e4 LT |
482 | } else { |
483 | ocr = 0; | |
484 | } | |
485 | ||
486 | return ocr; | |
487 | } | |
488 | ||
489 | #define UNSTUFF_BITS(resp,start,size) \ | |
490 | ({ \ | |
491 | const int __size = size; \ | |
492 | const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ | |
493 | const int __off = 3 - ((start) / 32); \ | |
494 | const int __shft = (start) & 31; \ | |
495 | u32 __res; \ | |
496 | \ | |
497 | __res = resp[__off] >> __shft; \ | |
498 | if (__size + __shft > 32) \ | |
499 | __res |= resp[__off-1] << ((32 - __shft) % 32); \ | |
500 | __res & __mask; \ | |
501 | }) | |
502 | ||
503 | /* | |
504 | * Given the decoded CSD structure, decode the raw CID to our CID structure. | |
505 | */ | |
506 | static void mmc_decode_cid(struct mmc_card *card) | |
507 | { | |
508 | u32 *resp = card->raw_cid; | |
509 | ||
510 | memset(&card->cid, 0, sizeof(struct mmc_cid)); | |
511 | ||
335eadf2 PO |
512 | if (mmc_card_sd(card)) { |
513 | /* | |
514 | * SD doesn't currently have a version field so we will | |
515 | * have to assume we can parse this. | |
516 | */ | |
517 | card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); | |
518 | card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); | |
519 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
520 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
521 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
522 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
523 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
524 | card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); | |
525 | card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); | |
526 | card->cid.serial = UNSTUFF_BITS(resp, 24, 32); | |
527 | card->cid.year = UNSTUFF_BITS(resp, 12, 8); | |
528 | card->cid.month = UNSTUFF_BITS(resp, 8, 4); | |
529 | ||
530 | card->cid.year += 2000; /* SD cards year offset */ | |
a00fc090 | 531 | } else { |
335eadf2 PO |
532 | /* |
533 | * The selection of the format here is based upon published | |
534 | * specs from sandisk and from what people have reported. | |
535 | */ | |
536 | switch (card->csd.mmca_vsn) { | |
537 | case 0: /* MMC v1.0 - v1.2 */ | |
538 | case 1: /* MMC v1.4 */ | |
539 | card->cid.manfid = UNSTUFF_BITS(resp, 104, 24); | |
540 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
541 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
542 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
543 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
544 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
545 | card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); | |
546 | card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8); | |
547 | card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4); | |
548 | card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4); | |
549 | card->cid.serial = UNSTUFF_BITS(resp, 16, 24); | |
550 | card->cid.month = UNSTUFF_BITS(resp, 12, 4); | |
551 | card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; | |
552 | break; | |
553 | ||
554 | case 2: /* MMC v2.0 - v2.2 */ | |
555 | case 3: /* MMC v3.1 - v3.3 */ | |
cb757b4e | 556 | case 4: /* MMC v4 */ |
335eadf2 PO |
557 | card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); |
558 | card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); | |
559 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
560 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
561 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
562 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
563 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
564 | card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); | |
565 | card->cid.serial = UNSTUFF_BITS(resp, 16, 32); | |
566 | card->cid.month = UNSTUFF_BITS(resp, 12, 4); | |
567 | card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; | |
568 | break; | |
569 | ||
570 | default: | |
571 | printk("%s: card has unknown MMCA version %d\n", | |
572 | mmc_hostname(card->host), card->csd.mmca_vsn); | |
573 | mmc_card_set_bad(card); | |
574 | break; | |
575 | } | |
1da177e4 LT |
576 | } |
577 | } | |
578 | ||
579 | /* | |
580 | * Given a 128-bit response, decode to our card CSD structure. | |
581 | */ | |
582 | static void mmc_decode_csd(struct mmc_card *card) | |
583 | { | |
584 | struct mmc_csd *csd = &card->csd; | |
585 | unsigned int e, m, csd_struct; | |
586 | u32 *resp = card->raw_csd; | |
587 | ||
335eadf2 PO |
588 | if (mmc_card_sd(card)) { |
589 | csd_struct = UNSTUFF_BITS(resp, 126, 2); | |
590 | if (csd_struct != 0) { | |
591 | printk("%s: unrecognised CSD structure version %d\n", | |
592 | mmc_hostname(card->host), csd_struct); | |
593 | mmc_card_set_bad(card); | |
594 | return; | |
595 | } | |
596 | ||
597 | m = UNSTUFF_BITS(resp, 115, 4); | |
598 | e = UNSTUFF_BITS(resp, 112, 3); | |
599 | csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; | |
600 | csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; | |
601 | ||
602 | m = UNSTUFF_BITS(resp, 99, 4); | |
603 | e = UNSTUFF_BITS(resp, 96, 3); | |
604 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
605 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
606 | ||
607 | e = UNSTUFF_BITS(resp, 47, 3); | |
608 | m = UNSTUFF_BITS(resp, 62, 12); | |
609 | csd->capacity = (1 + m) << (e + 2); | |
610 | ||
611 | csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); | |
a6f6c96b RK |
612 | csd->read_partial = UNSTUFF_BITS(resp, 79, 1); |
613 | csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); | |
614 | csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); | |
37be4e78 | 615 | csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); |
a6f6c96b RK |
616 | csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); |
617 | csd->write_partial = UNSTUFF_BITS(resp, 21, 1); | |
a00fc090 | 618 | } else { |
335eadf2 PO |
619 | /* |
620 | * We only understand CSD structure v1.1 and v1.2. | |
621 | * v1.2 has extra information in bits 15, 11 and 10. | |
622 | */ | |
623 | csd_struct = UNSTUFF_BITS(resp, 126, 2); | |
624 | if (csd_struct != 1 && csd_struct != 2) { | |
625 | printk("%s: unrecognised CSD structure version %d\n", | |
626 | mmc_hostname(card->host), csd_struct); | |
627 | mmc_card_set_bad(card); | |
628 | return; | |
629 | } | |
1da177e4 | 630 | |
335eadf2 PO |
631 | csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4); |
632 | m = UNSTUFF_BITS(resp, 115, 4); | |
633 | e = UNSTUFF_BITS(resp, 112, 3); | |
634 | csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; | |
635 | csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; | |
1da177e4 | 636 | |
335eadf2 PO |
637 | m = UNSTUFF_BITS(resp, 99, 4); |
638 | e = UNSTUFF_BITS(resp, 96, 3); | |
639 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
640 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
1da177e4 | 641 | |
335eadf2 PO |
642 | e = UNSTUFF_BITS(resp, 47, 3); |
643 | m = UNSTUFF_BITS(resp, 62, 12); | |
644 | csd->capacity = (1 + m) << (e + 2); | |
1da177e4 | 645 | |
335eadf2 | 646 | csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); |
a6f6c96b RK |
647 | csd->read_partial = UNSTUFF_BITS(resp, 79, 1); |
648 | csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); | |
649 | csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); | |
37be4e78 | 650 | csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); |
a6f6c96b RK |
651 | csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); |
652 | csd->write_partial = UNSTUFF_BITS(resp, 21, 1); | |
335eadf2 | 653 | } |
1da177e4 LT |
654 | } |
655 | ||
b57c43ad PO |
656 | /* |
657 | * Given a 64-bit response, decode to our card SCR structure. | |
658 | */ | |
659 | static void mmc_decode_scr(struct mmc_card *card) | |
660 | { | |
661 | struct sd_scr *scr = &card->scr; | |
662 | unsigned int scr_struct; | |
663 | u32 resp[4]; | |
664 | ||
665 | BUG_ON(!mmc_card_sd(card)); | |
666 | ||
667 | resp[3] = card->raw_scr[1]; | |
668 | resp[2] = card->raw_scr[0]; | |
669 | ||
670 | scr_struct = UNSTUFF_BITS(resp, 60, 4); | |
671 | if (scr_struct != 0) { | |
672 | printk("%s: unrecognised SCR structure version %d\n", | |
673 | mmc_hostname(card->host), scr_struct); | |
674 | mmc_card_set_bad(card); | |
675 | return; | |
676 | } | |
677 | ||
678 | scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); | |
679 | scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); | |
680 | } | |
681 | ||
1da177e4 LT |
682 | /* |
683 | * Locate a MMC card on this MMC host given a raw CID. | |
684 | */ | |
685 | static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid) | |
686 | { | |
687 | struct mmc_card *card; | |
688 | ||
689 | list_for_each_entry(card, &host->cards, node) { | |
690 | if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0) | |
691 | return card; | |
692 | } | |
693 | return NULL; | |
694 | } | |
695 | ||
696 | /* | |
697 | * Allocate a new MMC card, and assign a unique RCA. | |
698 | */ | |
699 | static struct mmc_card * | |
700 | mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca) | |
701 | { | |
702 | struct mmc_card *card, *c; | |
703 | unsigned int rca = *frca; | |
704 | ||
705 | card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL); | |
706 | if (!card) | |
707 | return ERR_PTR(-ENOMEM); | |
708 | ||
709 | mmc_init_card(card, host); | |
710 | memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid)); | |
711 | ||
712 | again: | |
713 | list_for_each_entry(c, &host->cards, node) | |
714 | if (c->rca == rca) { | |
715 | rca++; | |
716 | goto again; | |
717 | } | |
718 | ||
719 | card->rca = rca; | |
720 | ||
721 | *frca = rca; | |
722 | ||
723 | return card; | |
724 | } | |
725 | ||
726 | /* | |
727 | * Tell attached cards to go to IDLE state | |
728 | */ | |
729 | static void mmc_idle_cards(struct mmc_host *host) | |
730 | { | |
731 | struct mmc_command cmd; | |
732 | ||
865e9f13 | 733 | host->ios.chip_select = MMC_CS_HIGH; |
920e70c5 | 734 | mmc_set_ios(host); |
865e9f13 PO |
735 | |
736 | mmc_delay(1); | |
737 | ||
1da177e4 LT |
738 | cmd.opcode = MMC_GO_IDLE_STATE; |
739 | cmd.arg = 0; | |
e9225176 | 740 | cmd.flags = MMC_RSP_NONE | MMC_CMD_BC; |
1da177e4 LT |
741 | |
742 | mmc_wait_for_cmd(host, &cmd, 0); | |
743 | ||
744 | mmc_delay(1); | |
865e9f13 PO |
745 | |
746 | host->ios.chip_select = MMC_CS_DONTCARE; | |
920e70c5 | 747 | mmc_set_ios(host); |
865e9f13 PO |
748 | |
749 | mmc_delay(1); | |
1da177e4 LT |
750 | } |
751 | ||
752 | /* | |
45f8245b RK |
753 | * Apply power to the MMC stack. This is a two-stage process. |
754 | * First, we enable power to the card without the clock running. | |
755 | * We then wait a bit for the power to stabilise. Finally, | |
756 | * enable the bus drivers and clock to the card. | |
757 | * | |
758 | * We must _NOT_ enable the clock prior to power stablising. | |
759 | * | |
760 | * If a host does all the power sequencing itself, ignore the | |
761 | * initial MMC_POWER_UP stage. | |
1da177e4 LT |
762 | */ |
763 | static void mmc_power_up(struct mmc_host *host) | |
764 | { | |
765 | int bit = fls(host->ocr_avail) - 1; | |
766 | ||
767 | host->ios.vdd = bit; | |
768 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
865e9f13 | 769 | host->ios.chip_select = MMC_CS_DONTCARE; |
1da177e4 | 770 | host->ios.power_mode = MMC_POWER_UP; |
f218278a | 771 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
920e70c5 | 772 | mmc_set_ios(host); |
1da177e4 LT |
773 | |
774 | mmc_delay(1); | |
775 | ||
776 | host->ios.clock = host->f_min; | |
777 | host->ios.power_mode = MMC_POWER_ON; | |
920e70c5 | 778 | mmc_set_ios(host); |
1da177e4 LT |
779 | |
780 | mmc_delay(2); | |
781 | } | |
782 | ||
783 | static void mmc_power_off(struct mmc_host *host) | |
784 | { | |
785 | host->ios.clock = 0; | |
786 | host->ios.vdd = 0; | |
787 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
865e9f13 | 788 | host->ios.chip_select = MMC_CS_DONTCARE; |
1da177e4 | 789 | host->ios.power_mode = MMC_POWER_OFF; |
f218278a | 790 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
920e70c5 | 791 | mmc_set_ios(host); |
1da177e4 LT |
792 | } |
793 | ||
794 | static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) | |
795 | { | |
796 | struct mmc_command cmd; | |
797 | int i, err = 0; | |
798 | ||
799 | cmd.opcode = MMC_SEND_OP_COND; | |
800 | cmd.arg = ocr; | |
e9225176 | 801 | cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR; |
1da177e4 LT |
802 | |
803 | for (i = 100; i; i--) { | |
804 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
805 | if (err != MMC_ERR_NONE) | |
806 | break; | |
807 | ||
808 | if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0) | |
809 | break; | |
810 | ||
811 | err = MMC_ERR_TIMEOUT; | |
812 | ||
813 | mmc_delay(10); | |
814 | } | |
815 | ||
816 | if (rocr) | |
817 | *rocr = cmd.resp[0]; | |
818 | ||
819 | return err; | |
820 | } | |
821 | ||
335eadf2 PO |
822 | static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) |
823 | { | |
824 | struct mmc_command cmd; | |
825 | int i, err = 0; | |
826 | ||
827 | cmd.opcode = SD_APP_OP_COND; | |
828 | cmd.arg = ocr; | |
e9225176 | 829 | cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR; |
335eadf2 PO |
830 | |
831 | for (i = 100; i; i--) { | |
832 | err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES); | |
833 | if (err != MMC_ERR_NONE) | |
834 | break; | |
835 | ||
836 | if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0) | |
837 | break; | |
838 | ||
839 | err = MMC_ERR_TIMEOUT; | |
840 | ||
841 | mmc_delay(10); | |
842 | } | |
843 | ||
844 | if (rocr) | |
845 | *rocr = cmd.resp[0]; | |
846 | ||
847 | return err; | |
848 | } | |
849 | ||
1da177e4 LT |
850 | /* |
851 | * Discover cards by requesting their CID. If this command | |
852 | * times out, it is not an error; there are no further cards | |
853 | * to be discovered. Add new cards to the list. | |
854 | * | |
855 | * Create a mmc_card entry for each discovered card, assigning | |
856 | * it an RCA, and save the raw CID for decoding later. | |
857 | */ | |
858 | static void mmc_discover_cards(struct mmc_host *host) | |
859 | { | |
860 | struct mmc_card *card; | |
861 | unsigned int first_rca = 1, err; | |
862 | ||
863 | while (1) { | |
864 | struct mmc_command cmd; | |
865 | ||
866 | cmd.opcode = MMC_ALL_SEND_CID; | |
867 | cmd.arg = 0; | |
e9225176 | 868 | cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR; |
1da177e4 LT |
869 | |
870 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
871 | if (err == MMC_ERR_TIMEOUT) { | |
872 | err = MMC_ERR_NONE; | |
873 | break; | |
874 | } | |
875 | if (err != MMC_ERR_NONE) { | |
876 | printk(KERN_ERR "%s: error requesting CID: %d\n", | |
d366b643 | 877 | mmc_hostname(host), err); |
1da177e4 LT |
878 | break; |
879 | } | |
880 | ||
881 | card = mmc_find_card(host, cmd.resp); | |
882 | if (!card) { | |
883 | card = mmc_alloc_card(host, cmd.resp, &first_rca); | |
884 | if (IS_ERR(card)) { | |
885 | err = PTR_ERR(card); | |
886 | break; | |
887 | } | |
888 | list_add(&card->node, &host->cards); | |
889 | } | |
890 | ||
891 | card->state &= ~MMC_STATE_DEAD; | |
892 | ||
335eadf2 PO |
893 | if (host->mode == MMC_MODE_SD) { |
894 | mmc_card_set_sd(card); | |
1da177e4 | 895 | |
335eadf2 PO |
896 | cmd.opcode = SD_SEND_RELATIVE_ADDR; |
897 | cmd.arg = 0; | |
e9225176 | 898 | cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR; |
335eadf2 PO |
899 | |
900 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
901 | if (err != MMC_ERR_NONE) | |
902 | mmc_card_set_dead(card); | |
a00fc090 | 903 | else { |
335eadf2 | 904 | card->rca = cmd.resp[0] >> 16; |
a00fc090 PO |
905 | |
906 | if (!host->ops->get_ro) { | |
907 | printk(KERN_WARNING "%s: host does not " | |
908 | "support reading read-only " | |
909 | "switch. assuming write-enable.\n", | |
910 | mmc_hostname(host)); | |
911 | } else { | |
912 | if (host->ops->get_ro(host)) | |
913 | mmc_card_set_readonly(card); | |
914 | } | |
915 | } | |
916 | } else { | |
335eadf2 PO |
917 | cmd.opcode = MMC_SET_RELATIVE_ADDR; |
918 | cmd.arg = card->rca << 16; | |
e9225176 | 919 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
335eadf2 PO |
920 | |
921 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
922 | if (err != MMC_ERR_NONE) | |
923 | mmc_card_set_dead(card); | |
924 | } | |
1da177e4 LT |
925 | } |
926 | } | |
927 | ||
928 | static void mmc_read_csds(struct mmc_host *host) | |
929 | { | |
930 | struct mmc_card *card; | |
931 | ||
932 | list_for_each_entry(card, &host->cards, node) { | |
933 | struct mmc_command cmd; | |
934 | int err; | |
935 | ||
936 | if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) | |
937 | continue; | |
938 | ||
939 | cmd.opcode = MMC_SEND_CSD; | |
940 | cmd.arg = card->rca << 16; | |
e9225176 | 941 | cmd.flags = MMC_RSP_R2 | MMC_CMD_AC; |
1da177e4 LT |
942 | |
943 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
944 | if (err != MMC_ERR_NONE) { | |
945 | mmc_card_set_dead(card); | |
946 | continue; | |
947 | } | |
948 | ||
949 | memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd)); | |
950 | ||
951 | mmc_decode_csd(card); | |
952 | mmc_decode_cid(card); | |
953 | } | |
954 | } | |
955 | ||
b57c43ad PO |
956 | static void mmc_read_scrs(struct mmc_host *host) |
957 | { | |
958 | int err; | |
959 | struct mmc_card *card; | |
b57c43ad PO |
960 | struct mmc_request mrq; |
961 | struct mmc_command cmd; | |
962 | struct mmc_data data; | |
b57c43ad PO |
963 | struct scatterlist sg; |
964 | ||
965 | list_for_each_entry(card, &host->cards, node) { | |
966 | if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) | |
967 | continue; | |
968 | if (!mmc_card_sd(card)) | |
969 | continue; | |
970 | ||
971 | err = mmc_select_card(host, card); | |
972 | if (err != MMC_ERR_NONE) { | |
973 | mmc_card_set_dead(card); | |
974 | continue; | |
975 | } | |
976 | ||
977 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
978 | ||
979 | cmd.opcode = MMC_APP_CMD; | |
980 | cmd.arg = card->rca << 16; | |
e9225176 | 981 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
b57c43ad PO |
982 | |
983 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
984 | if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) { | |
985 | mmc_card_set_dead(card); | |
986 | continue; | |
987 | } | |
988 | ||
989 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
990 | ||
991 | cmd.opcode = SD_APP_SEND_SCR; | |
992 | cmd.arg = 0; | |
e9225176 | 993 | cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; |
b57c43ad PO |
994 | |
995 | memset(&data, 0, sizeof(struct mmc_data)); | |
996 | ||
d773d725 | 997 | mmc_set_data_timeout(&data, card, 0); |
385e3227 | 998 | |
2c171bf1 | 999 | data.blksz = 1 << 3; |
b57c43ad PO |
1000 | data.blocks = 1; |
1001 | data.flags = MMC_DATA_READ; | |
1002 | data.sg = &sg; | |
1003 | data.sg_len = 1; | |
1004 | ||
1005 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
1006 | ||
1007 | mrq.cmd = &cmd; | |
1008 | mrq.data = &data; | |
1009 | ||
1010 | sg_init_one(&sg, (u8*)card->raw_scr, 8); | |
1011 | ||
e781de44 PO |
1012 | mmc_wait_for_req(host, &mrq); |
1013 | ||
1014 | if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) { | |
b57c43ad PO |
1015 | mmc_card_set_dead(card); |
1016 | continue; | |
1017 | } | |
1018 | ||
1019 | card->raw_scr[0] = ntohl(card->raw_scr[0]); | |
1020 | card->raw_scr[1] = ntohl(card->raw_scr[1]); | |
1021 | ||
1022 | mmc_decode_scr(card); | |
1023 | } | |
1024 | ||
1025 | mmc_deselect_cards(host); | |
1026 | } | |
1027 | ||
1da177e4 LT |
1028 | static unsigned int mmc_calculate_clock(struct mmc_host *host) |
1029 | { | |
1030 | struct mmc_card *card; | |
1031 | unsigned int max_dtr = host->f_max; | |
1032 | ||
1033 | list_for_each_entry(card, &host->cards, node) | |
1034 | if (!mmc_card_dead(card) && max_dtr > card->csd.max_dtr) | |
1035 | max_dtr = card->csd.max_dtr; | |
1036 | ||
920e70c5 RK |
1037 | pr_debug("%s: selected %d.%03dMHz transfer rate\n", |
1038 | mmc_hostname(host), | |
c6563178 | 1039 | max_dtr / 1000000, (max_dtr / 1000) % 1000); |
1da177e4 LT |
1040 | |
1041 | return max_dtr; | |
1042 | } | |
1043 | ||
1044 | /* | |
1045 | * Check whether cards we already know about are still present. | |
1046 | * We do this by requesting status, and checking whether a card | |
1047 | * responds. | |
1048 | * | |
1049 | * A request for status does not cause a state change in data | |
1050 | * transfer mode. | |
1051 | */ | |
1052 | static void mmc_check_cards(struct mmc_host *host) | |
1053 | { | |
1054 | struct list_head *l, *n; | |
1055 | ||
1056 | mmc_deselect_cards(host); | |
1057 | ||
1058 | list_for_each_safe(l, n, &host->cards) { | |
1059 | struct mmc_card *card = mmc_list_to_card(l); | |
1060 | struct mmc_command cmd; | |
1061 | int err; | |
1062 | ||
1063 | cmd.opcode = MMC_SEND_STATUS; | |
1064 | cmd.arg = card->rca << 16; | |
e9225176 | 1065 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
1da177e4 LT |
1066 | |
1067 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
1068 | if (err == MMC_ERR_NONE) | |
1069 | continue; | |
1070 | ||
1071 | mmc_card_set_dead(card); | |
1072 | } | |
1073 | } | |
1074 | ||
1075 | static void mmc_setup(struct mmc_host *host) | |
1076 | { | |
1077 | if (host->ios.power_mode != MMC_POWER_ON) { | |
1078 | int err; | |
1079 | u32 ocr; | |
1080 | ||
a00fc090 | 1081 | host->mode = MMC_MODE_SD; |
335eadf2 | 1082 | |
1da177e4 LT |
1083 | mmc_power_up(host); |
1084 | mmc_idle_cards(host); | |
1085 | ||
a00fc090 | 1086 | err = mmc_send_app_op_cond(host, 0, &ocr); |
335eadf2 PO |
1087 | |
1088 | /* | |
a00fc090 PO |
1089 | * If we fail to detect any SD cards then try |
1090 | * searching for MMC cards. | |
335eadf2 | 1091 | */ |
a00fc090 PO |
1092 | if (err != MMC_ERR_NONE) { |
1093 | host->mode = MMC_MODE_MMC; | |
1094 | ||
1095 | err = mmc_send_op_cond(host, 0, &ocr); | |
335eadf2 PO |
1096 | if (err != MMC_ERR_NONE) |
1097 | return; | |
335eadf2 | 1098 | } |
1da177e4 LT |
1099 | |
1100 | host->ocr = mmc_select_voltage(host, ocr); | |
1101 | ||
1102 | /* | |
1103 | * Since we're changing the OCR value, we seem to | |
1104 | * need to tell some cards to go back to the idle | |
1105 | * state. We wait 1ms to give cards time to | |
1106 | * respond. | |
1107 | */ | |
1108 | if (host->ocr) | |
1109 | mmc_idle_cards(host); | |
1110 | } else { | |
1111 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
1112 | host->ios.clock = host->f_min; | |
920e70c5 | 1113 | mmc_set_ios(host); |
1da177e4 LT |
1114 | |
1115 | /* | |
1116 | * We should remember the OCR mask from the existing | |
1117 | * cards, and detect the new cards OCR mask, combine | |
1118 | * the two and re-select the VDD. However, if we do | |
1119 | * change VDD, we should do an idle, and then do a | |
1120 | * full re-initialisation. We would need to notify | |
1121 | * drivers so that they can re-setup the cards as | |
1122 | * well, while keeping their queues at bay. | |
1123 | * | |
1124 | * For the moment, we take the easy way out - if the | |
1125 | * new cards don't like our currently selected VDD, | |
1126 | * they drop off the bus. | |
1127 | */ | |
1128 | } | |
1129 | ||
1130 | if (host->ocr == 0) | |
1131 | return; | |
1132 | ||
1133 | /* | |
1134 | * Send the selected OCR multiple times... until the cards | |
1135 | * all get the idea that they should be ready for CMD2. | |
1136 | * (My SanDisk card seems to need this.) | |
1137 | */ | |
335eadf2 PO |
1138 | if (host->mode == MMC_MODE_SD) |
1139 | mmc_send_app_op_cond(host, host->ocr, NULL); | |
1140 | else | |
1141 | mmc_send_op_cond(host, host->ocr, NULL); | |
1da177e4 LT |
1142 | |
1143 | mmc_discover_cards(host); | |
1144 | ||
1145 | /* | |
1146 | * Ok, now switch to push-pull mode. | |
1147 | */ | |
1148 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
920e70c5 | 1149 | mmc_set_ios(host); |
1da177e4 LT |
1150 | |
1151 | mmc_read_csds(host); | |
b57c43ad PO |
1152 | |
1153 | if (host->mode == MMC_MODE_SD) | |
1154 | mmc_read_scrs(host); | |
1da177e4 LT |
1155 | } |
1156 | ||
1157 | ||
1158 | /** | |
1159 | * mmc_detect_change - process change of state on a MMC socket | |
1160 | * @host: host which changed state. | |
8dc00335 | 1161 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 LT |
1162 | * |
1163 | * All we know is that card(s) have been inserted or removed | |
1164 | * from the socket(s). We don't know which socket or cards. | |
1165 | */ | |
8dc00335 | 1166 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 1167 | { |
8dc00335 | 1168 | if (delay) |
7104e2d5 | 1169 | mmc_schedule_delayed_work(&host->detect, delay); |
8dc00335 | 1170 | else |
7104e2d5 | 1171 | mmc_schedule_work(&host->detect); |
1da177e4 LT |
1172 | } |
1173 | ||
1174 | EXPORT_SYMBOL(mmc_detect_change); | |
1175 | ||
1176 | ||
1177 | static void mmc_rescan(void *data) | |
1178 | { | |
1179 | struct mmc_host *host = data; | |
1180 | struct list_head *l, *n; | |
1181 | ||
1182 | mmc_claim_host(host); | |
1183 | ||
1184 | if (host->ios.power_mode == MMC_POWER_ON) | |
1185 | mmc_check_cards(host); | |
1186 | ||
1187 | mmc_setup(host); | |
1188 | ||
1189 | if (!list_empty(&host->cards)) { | |
1190 | /* | |
1191 | * (Re-)calculate the fastest clock rate which the | |
1192 | * attached cards and the host support. | |
1193 | */ | |
1194 | host->ios.clock = mmc_calculate_clock(host); | |
920e70c5 | 1195 | mmc_set_ios(host); |
1da177e4 LT |
1196 | } |
1197 | ||
1198 | mmc_release_host(host); | |
1199 | ||
1200 | list_for_each_safe(l, n, &host->cards) { | |
1201 | struct mmc_card *card = mmc_list_to_card(l); | |
1202 | ||
1203 | /* | |
1204 | * If this is a new and good card, register it. | |
1205 | */ | |
1206 | if (!mmc_card_present(card) && !mmc_card_dead(card)) { | |
1207 | if (mmc_register_card(card)) | |
1208 | mmc_card_set_dead(card); | |
1209 | else | |
1210 | mmc_card_set_present(card); | |
1211 | } | |
1212 | ||
1213 | /* | |
1214 | * If this card is dead, destroy it. | |
1215 | */ | |
1216 | if (mmc_card_dead(card)) { | |
1217 | list_del(&card->node); | |
1218 | mmc_remove_card(card); | |
1219 | } | |
1220 | } | |
1221 | ||
1222 | /* | |
1223 | * If we discover that there are no cards on the | |
1224 | * bus, turn off the clock and power down. | |
1225 | */ | |
1226 | if (list_empty(&host->cards)) | |
1227 | mmc_power_off(host); | |
1228 | } | |
1229 | ||
1230 | ||
1231 | /** | |
1232 | * mmc_alloc_host - initialise the per-host structure. | |
1233 | * @extra: sizeof private data structure | |
1234 | * @dev: pointer to host device model structure | |
1235 | * | |
1236 | * Initialise the per-host structure. | |
1237 | */ | |
1238 | struct mmc_host *mmc_alloc_host(int extra, struct device *dev) | |
1239 | { | |
1240 | struct mmc_host *host; | |
1241 | ||
00b137cf | 1242 | host = mmc_alloc_host_sysfs(extra, dev); |
1da177e4 | 1243 | if (host) { |
1da177e4 LT |
1244 | spin_lock_init(&host->lock); |
1245 | init_waitqueue_head(&host->wq); | |
1246 | INIT_LIST_HEAD(&host->cards); | |
1247 | INIT_WORK(&host->detect, mmc_rescan, host); | |
1248 | ||
1da177e4 LT |
1249 | /* |
1250 | * By default, hosts do not support SGIO or large requests. | |
1251 | * They have to set these according to their abilities. | |
1252 | */ | |
1253 | host->max_hw_segs = 1; | |
1254 | host->max_phys_segs = 1; | |
1255 | host->max_sectors = 1 << (PAGE_CACHE_SHIFT - 9); | |
1256 | host->max_seg_size = PAGE_CACHE_SIZE; | |
1257 | } | |
1258 | ||
1259 | return host; | |
1260 | } | |
1261 | ||
1262 | EXPORT_SYMBOL(mmc_alloc_host); | |
1263 | ||
1264 | /** | |
1265 | * mmc_add_host - initialise host hardware | |
1266 | * @host: mmc host | |
1267 | */ | |
1268 | int mmc_add_host(struct mmc_host *host) | |
1269 | { | |
00b137cf | 1270 | int ret; |
1da177e4 | 1271 | |
00b137cf RK |
1272 | ret = mmc_add_host_sysfs(host); |
1273 | if (ret == 0) { | |
1274 | mmc_power_off(host); | |
8dc00335 | 1275 | mmc_detect_change(host, 0); |
00b137cf | 1276 | } |
1da177e4 | 1277 | |
00b137cf | 1278 | return ret; |
1da177e4 LT |
1279 | } |
1280 | ||
1281 | EXPORT_SYMBOL(mmc_add_host); | |
1282 | ||
1283 | /** | |
1284 | * mmc_remove_host - remove host hardware | |
1285 | * @host: mmc host | |
1286 | * | |
1287 | * Unregister and remove all cards associated with this host, | |
1288 | * and power down the MMC bus. | |
1289 | */ | |
1290 | void mmc_remove_host(struct mmc_host *host) | |
1291 | { | |
1292 | struct list_head *l, *n; | |
1293 | ||
1294 | list_for_each_safe(l, n, &host->cards) { | |
1295 | struct mmc_card *card = mmc_list_to_card(l); | |
1296 | ||
1297 | mmc_remove_card(card); | |
1298 | } | |
1299 | ||
1300 | mmc_power_off(host); | |
00b137cf | 1301 | mmc_remove_host_sysfs(host); |
1da177e4 LT |
1302 | } |
1303 | ||
1304 | EXPORT_SYMBOL(mmc_remove_host); | |
1305 | ||
1306 | /** | |
1307 | * mmc_free_host - free the host structure | |
1308 | * @host: mmc host | |
1309 | * | |
1310 | * Free the host once all references to it have been dropped. | |
1311 | */ | |
1312 | void mmc_free_host(struct mmc_host *host) | |
1313 | { | |
7104e2d5 | 1314 | mmc_flush_scheduled_work(); |
00b137cf | 1315 | mmc_free_host_sysfs(host); |
1da177e4 LT |
1316 | } |
1317 | ||
1318 | EXPORT_SYMBOL(mmc_free_host); | |
1319 | ||
1320 | #ifdef CONFIG_PM | |
1321 | ||
1322 | /** | |
1323 | * mmc_suspend_host - suspend a host | |
1324 | * @host: mmc host | |
1325 | * @state: suspend mode (PM_SUSPEND_xxx) | |
1326 | */ | |
e5378ca8 | 1327 | int mmc_suspend_host(struct mmc_host *host, pm_message_t state) |
1da177e4 LT |
1328 | { |
1329 | mmc_claim_host(host); | |
1330 | mmc_deselect_cards(host); | |
1331 | mmc_power_off(host); | |
1332 | mmc_release_host(host); | |
1333 | ||
1334 | return 0; | |
1335 | } | |
1336 | ||
1337 | EXPORT_SYMBOL(mmc_suspend_host); | |
1338 | ||
1339 | /** | |
1340 | * mmc_resume_host - resume a previously suspended host | |
1341 | * @host: mmc host | |
1342 | */ | |
1343 | int mmc_resume_host(struct mmc_host *host) | |
1344 | { | |
896937ad | 1345 | mmc_rescan(host); |
1da177e4 LT |
1346 | |
1347 | return 0; | |
1348 | } | |
1349 | ||
1350 | EXPORT_SYMBOL(mmc_resume_host); | |
1351 | ||
1352 | #endif | |
1353 | ||
1354 | MODULE_LICENSE("GPL"); |