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Linux 2.6.21
[linux/fpc-iii.git] / drivers / mmc / mmc.c
blob4a73e8b2428d8e3d61f21c1bcc990aa23ce4f976
1 /*
2 * linux/drivers/mmc/mmc.c
3 *
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * SD support Copyright (C) 2005 Pierre Ossman, All Rights Reserved.
7 * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
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>
21 #include <asm/scatterlist.h>
22 #include <linux/scatterlist.h>
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 #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 request
63 * @host: MMC host which completed request
64 * @mrq: MMC request which request
65 *
66 * MMC drivers should call this function when they have completed
67 * their processing of a request.
68 */
69 void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
70 {
71 struct mmc_command *cmd = mrq->cmd;
72 int err = cmd->error;
73
74 pr_debug("%s: req done (CMD%u): %d/%d/%d: %08x %08x %08x %08x\n",
75 mmc_hostname(host), cmd->opcode, err,
76 mrq->data ? mrq->data->error : 0,
77 mrq->stop ? mrq->stop->error : 0,
78 cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]);
79
80 if (err && cmd->retries) {
81 cmd->retries--;
82 cmd->error = 0;
83 host->ops->request(host, mrq);
84 } else if (mrq->done) {
85 mrq->done(mrq);
86 }
87 }
88
89 EXPORT_SYMBOL(mmc_request_done);
90
91 /**
92 * mmc_start_request - start a command on a host
93 * @host: MMC host to start command on
94 * @mrq: MMC request to start
95 *
96 * Queue a command on the specified host. We expect the
97 * caller to be holding the host lock with interrupts disabled.
98 */
99 void
100 mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
101 {
102 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
103 mmc_hostname(host), mrq->cmd->opcode,
104 mrq->cmd->arg, mrq->cmd->flags);
105
106 WARN_ON(!host->claimed);
107
108 mrq->cmd->error = 0;
109 mrq->cmd->mrq = mrq;
110 if (mrq->data) {
111 BUG_ON(mrq->data->blksz > host->max_blk_size);
112 BUG_ON(mrq->data->blocks > host->max_blk_count);
113 BUG_ON(mrq->data->blocks * mrq->data->blksz >
114 host->max_req_size);
115
116 mrq->cmd->data = mrq->data;
117 mrq->data->error = 0;
118 mrq->data->mrq = mrq;
119 if (mrq->stop) {
120 mrq->data->stop = mrq->stop;
121 mrq->stop->error = 0;
122 mrq->stop->mrq = mrq;
123 }
124 }
125 host->ops->request(host, mrq);
126 }
127
128 EXPORT_SYMBOL(mmc_start_request);
129
130 static void mmc_wait_done(struct mmc_request *mrq)
131 {
132 complete(mrq->done_data);
133 }
134
135 int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
136 {
137 DECLARE_COMPLETION_ONSTACK(complete);
138
139 mrq->done_data = &complete;
140 mrq->done = mmc_wait_done;
141
142 mmc_start_request(host, mrq);
143
144 wait_for_completion(&complete);
145
146 return 0;
147 }
148
149 EXPORT_SYMBOL(mmc_wait_for_req);
150
151 /**
152 * mmc_wait_for_cmd - start a command and wait for completion
153 * @host: MMC host to start command
154 * @cmd: MMC command to start
155 * @retries: maximum number of retries
156 *
157 * Start a new MMC command for a host, and wait for the command
158 * to complete. Return any error that occurred while the command
159 * was executing. Do not attempt to parse the response.
160 */
161 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
162 {
163 struct mmc_request mrq;
164
165 BUG_ON(!host->claimed);
166
167 memset(&mrq, 0, sizeof(struct mmc_request));
168
169 memset(cmd->resp, 0, sizeof(cmd->resp));
170 cmd->retries = retries;
171
172 mrq.cmd = cmd;
173 cmd->data = NULL;
174
175 mmc_wait_for_req(host, &mrq);
176
177 return cmd->error;
178 }
179
180 EXPORT_SYMBOL(mmc_wait_for_cmd);
181
182 /**
183 * mmc_wait_for_app_cmd - start an application command and wait for
184 completion
185 * @host: MMC host to start command
186 * @rca: RCA to send MMC_APP_CMD to
187 * @cmd: MMC command to start
188 * @retries: maximum number of retries
189 *
190 * Sends a MMC_APP_CMD, checks the card response, sends the command
191 * in the parameter and waits for it to complete. Return any error
192 * that occurred while the command was executing. Do not attempt to
193 * parse the response.
194 */
195 int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca,
196 struct mmc_command *cmd, int retries)
197 {
198 struct mmc_request mrq;
199 struct mmc_command appcmd;
200
201 int i, err;
202
203 BUG_ON(!host->claimed);
204 BUG_ON(retries < 0);
205
206 err = MMC_ERR_INVALID;
207
208 /*
209 * We have to resend MMC_APP_CMD for each attempt so
210 * we cannot use the retries field in mmc_command.
211 */
212 for (i = 0;i <= retries;i++) {
213 memset(&mrq, 0, sizeof(struct mmc_request));
214
215 appcmd.opcode = MMC_APP_CMD;
216 appcmd.arg = rca << 16;
217 appcmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
218 appcmd.retries = 0;
219 memset(appcmd.resp, 0, sizeof(appcmd.resp));
220 appcmd.data = NULL;
221
222 mrq.cmd = &appcmd;
223 appcmd.data = NULL;
224
225 mmc_wait_for_req(host, &mrq);
226
227 if (appcmd.error) {
228 err = appcmd.error;
229 continue;
230 }
231
232 /* Check that card supported application commands */
233 if (!(appcmd.resp[0] & R1_APP_CMD))
234 return MMC_ERR_FAILED;
235
236 memset(&mrq, 0, sizeof(struct mmc_request));
237
238 memset(cmd->resp, 0, sizeof(cmd->resp));
239 cmd->retries = 0;
240
241 mrq.cmd = cmd;
242 cmd->data = NULL;
243
244 mmc_wait_for_req(host, &mrq);
245
246 err = cmd->error;
247 if (cmd->error == MMC_ERR_NONE)
248 break;
249 }
250
251 return err;
252 }
253
254 EXPORT_SYMBOL(mmc_wait_for_app_cmd);
255
256 /**
257 * mmc_set_data_timeout - set the timeout for a data command
258 * @data: data phase for command
259 * @card: the MMC card associated with the data transfer
260 * @write: flag to differentiate reads from writes
261 */
262 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card,
263 int write)
264 {
265 unsigned int mult;
266
267 /*
268 * SD cards use a 100 multiplier rather than 10
269 */
270 mult = mmc_card_sd(card) ? 100 : 10;
271
272 /*
273 * Scale up the multiplier (and therefore the timeout) by
274 * the r2w factor for writes.
275 */
276 if (write)
277 mult <<= card->csd.r2w_factor;
278
279 data->timeout_ns = card->csd.tacc_ns * mult;
280 data->timeout_clks = card->csd.tacc_clks * mult;
281
282 /*
283 * SD cards also have an upper limit on the timeout.
284 */
285 if (mmc_card_sd(card)) {
286 unsigned int timeout_us, limit_us;
287
288 timeout_us = data->timeout_ns / 1000;
289 timeout_us += data->timeout_clks * 1000 /
290 (card->host->ios.clock / 1000);
291
292 if (write)
293 limit_us = 250000;
294 else
295 limit_us = 100000;
296
297 /*
298 * SDHC cards always use these fixed values.
299 */
300 if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
301 data->timeout_ns = limit_us * 1000;
302 data->timeout_clks = 0;
303 }
304 }
305 }
306 EXPORT_SYMBOL(mmc_set_data_timeout);
307
308 static int mmc_select_card(struct mmc_host *host, struct mmc_card *card);
309
310 /**
311 * __mmc_claim_host - exclusively claim a host
312 * @host: mmc host to claim
313 * @card: mmc card to claim host for
314 *
315 * Claim a host for a set of operations. If a valid card
316 * is passed and this wasn't the last card selected, select
317 * the card before returning.
318 *
319 * Note: you should use mmc_card_claim_host or mmc_claim_host.
320 */
321 int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card)
322 {
323 DECLARE_WAITQUEUE(wait, current);
324 unsigned long flags;
325 int err = 0;
326
327 add_wait_queue(&host->wq, &wait);
328 spin_lock_irqsave(&host->lock, flags);
329 while (1) {
330 set_current_state(TASK_UNINTERRUPTIBLE);
331 if (!host->claimed)
332 break;
333 spin_unlock_irqrestore(&host->lock, flags);
334 schedule();
335 spin_lock_irqsave(&host->lock, flags);
336 }
337 set_current_state(TASK_RUNNING);
338 host->claimed = 1;
339 spin_unlock_irqrestore(&host->lock, flags);
340 remove_wait_queue(&host->wq, &wait);
341
342 if (card != (void *)-1) {
343 err = mmc_select_card(host, card);
344 if (err != MMC_ERR_NONE)
345 return err;
346 }
347
348 return err;
349 }
350
351 EXPORT_SYMBOL(__mmc_claim_host);
352
353 /**
354 * mmc_release_host - release a host
355 * @host: mmc host to release
356 *
357 * Release a MMC host, allowing others to claim the host
358 * for their operations.
359 */
360 void mmc_release_host(struct mmc_host *host)
361 {
362 unsigned long flags;
363
364 BUG_ON(!host->claimed);
365
366 spin_lock_irqsave(&host->lock, flags);
367 host->claimed = 0;
368 spin_unlock_irqrestore(&host->lock, flags);
369
370 wake_up(&host->wq);
371 }
372
373 EXPORT_SYMBOL(mmc_release_host);
374
375 static inline void mmc_set_ios(struct mmc_host *host)
376 {
377 struct mmc_ios *ios = &host->ios;
378
379 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
380 "width %u timing %u\n",
381 mmc_hostname(host), ios->clock, ios->bus_mode,
382 ios->power_mode, ios->chip_select, ios->vdd,
383 ios->bus_width, ios->timing);
384
385 host->ops->set_ios(host, ios);
386 }
387
388 static int mmc_select_card(struct mmc_host *host, struct mmc_card *card)
389 {
390 int err;
391 struct mmc_command cmd;
392
393 BUG_ON(!host->claimed);
394
395 if (host->card_selected == card)
396 return MMC_ERR_NONE;
397
398 host->card_selected = card;
399
400 cmd.opcode = MMC_SELECT_CARD;
401 cmd.arg = card->rca << 16;
402 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
403
404 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
405 if (err != MMC_ERR_NONE)
406 return err;
407
408 /*
409 * We can only change the bus width of SD cards when
410 * they are selected so we have to put the handling
411 * here.
412 *
413 * The card is in 1 bit mode by default so
414 * we only need to change if it supports the
415 * wider version.
416 */
417 if (mmc_card_sd(card) &&
418 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
419
420 /*
421 * Default bus width is 1 bit.
422 */
423 host->ios.bus_width = MMC_BUS_WIDTH_1;
424
425 if (host->caps & MMC_CAP_4_BIT_DATA) {
426 struct mmc_command cmd;
427 cmd.opcode = SD_APP_SET_BUS_WIDTH;
428 cmd.arg = SD_BUS_WIDTH_4;
429 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
430
431 err = mmc_wait_for_app_cmd(host, card->rca, &cmd,
432 CMD_RETRIES);
433 if (err != MMC_ERR_NONE)
434 return err;
435
436 host->ios.bus_width = MMC_BUS_WIDTH_4;
437 }
438 }
439
440 mmc_set_ios(host);
441
442 return MMC_ERR_NONE;
443 }
444
445 /*
446 * Ensure that no card is selected.
447 */
448 static void mmc_deselect_cards(struct mmc_host *host)
449 {
450 struct mmc_command cmd;
451
452 if (host->card_selected) {
453 host->card_selected = NULL;
454
455 cmd.opcode = MMC_SELECT_CARD;
456 cmd.arg = 0;
457 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
458
459 mmc_wait_for_cmd(host, &cmd, 0);
460 }
461 }
462
463
464 static inline void mmc_delay(unsigned int ms)
465 {
466 if (ms < 1000 / HZ) {
467 cond_resched();
468 mdelay(ms);
469 } else {
470 msleep(ms);
471 }
472 }
473
474 /*
475 * Mask off any voltages we don't support and select
476 * the lowest voltage
477 */
478 static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
479 {
480 int bit;
481
482 ocr &= host->ocr_avail;
483
484 bit = ffs(ocr);
485 if (bit) {
486 bit -= 1;
487
488 ocr &= 3 << bit;
489
490 host->ios.vdd = bit;
491 mmc_set_ios(host);
492 } else {
493 ocr = 0;
494 }
495
496 return ocr;
497 }
498
499 #define UNSTUFF_BITS(resp,start,size) \
500 ({ \
501 const int __size = size; \
502 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
503 const int __off = 3 - ((start) / 32); \
504 const int __shft = (start) & 31; \
505 u32 __res; \
506 \
507 __res = resp[__off] >> __shft; \
508 if (__size + __shft > 32) \
509 __res |= resp[__off-1] << ((32 - __shft) % 32); \
510 __res & __mask; \
511 })
512
513 /*
514 * Given the decoded CSD structure, decode the raw CID to our CID structure.
515 */
516 static void mmc_decode_cid(struct mmc_card *card)
517 {
518 u32 *resp = card->raw_cid;
519
520 memset(&card->cid, 0, sizeof(struct mmc_cid));
521
522 if (mmc_card_sd(card)) {
523 /*
524 * SD doesn't currently have a version field so we will
525 * have to assume we can parse this.
526 */
527 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
528 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
529 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
530 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
531 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
532 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
533 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
534 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
535 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
536 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
537 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
538 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
539
540 card->cid.year += 2000; /* SD cards year offset */
541 } else {
542 /*
543 * The selection of the format here is based upon published
544 * specs from sandisk and from what people have reported.
545 */
546 switch (card->csd.mmca_vsn) {
547 case 0: /* MMC v1.0 - v1.2 */
548 case 1: /* MMC v1.4 */
549 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
550 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
551 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
552 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
553 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
554 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
555 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
556 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
557 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
558 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
559 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
560 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
561 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
562 break;
563
564 case 2: /* MMC v2.0 - v2.2 */
565 case 3: /* MMC v3.1 - v3.3 */
566 case 4: /* MMC v4 */
567 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
568 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
569 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
570 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
571 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
572 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
573 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
574 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
575 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
576 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
577 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
578 break;
579
580 default:
581 printk("%s: card has unknown MMCA version %d\n",
582 mmc_hostname(card->host), card->csd.mmca_vsn);
583 mmc_card_set_bad(card);
584 break;
585 }
586 }
587 }
588
589 /*
590 * Given a 128-bit response, decode to our card CSD structure.
591 */
592 static void mmc_decode_csd(struct mmc_card *card)
593 {
594 struct mmc_csd *csd = &card->csd;
595 unsigned int e, m, csd_struct;
596 u32 *resp = card->raw_csd;
597
598 if (mmc_card_sd(card)) {
599 csd_struct = UNSTUFF_BITS(resp, 126, 2);
600
601 switch (csd_struct) {
602 case 0:
603 m = UNSTUFF_BITS(resp, 115, 4);
604 e = UNSTUFF_BITS(resp, 112, 3);
605 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
606 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
607
608 m = UNSTUFF_BITS(resp, 99, 4);
609 e = UNSTUFF_BITS(resp, 96, 3);
610 csd->max_dtr = tran_exp[e] * tran_mant[m];
611 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
612
613 e = UNSTUFF_BITS(resp, 47, 3);
614 m = UNSTUFF_BITS(resp, 62, 12);
615 csd->capacity = (1 + m) << (e + 2);
616
617 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
618 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
619 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
620 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
621 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
622 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
623 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
624 break;
625 case 1:
626 /*
627 * This is a block-addressed SDHC card. Most
628 * interesting fields are unused and have fixed
629 * values. To avoid getting tripped by buggy cards,
630 * we assume those fixed values ourselves.
631 */
632 mmc_card_set_blockaddr(card);
633
634 csd->tacc_ns = 0; /* Unused */
635 csd->tacc_clks = 0; /* Unused */
636
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);
641
642 m = UNSTUFF_BITS(resp, 48, 22);
643 csd->capacity = (1 + m) << 10;
644
645 csd->read_blkbits = 9;
646 csd->read_partial = 0;
647 csd->write_misalign = 0;
648 csd->read_misalign = 0;
649 csd->r2w_factor = 4; /* Unused */
650 csd->write_blkbits = 9;
651 csd->write_partial = 0;
652 break;
653 default:
654 printk("%s: unrecognised CSD structure version %d\n",
655 mmc_hostname(card->host), csd_struct);
656 mmc_card_set_bad(card);
657 return;
658 }
659 } else {
660 /*
661 * We only understand CSD structure v1.1 and v1.2.
662 * v1.2 has extra information in bits 15, 11 and 10.
663 */
664 csd_struct = UNSTUFF_BITS(resp, 126, 2);
665 if (csd_struct != 1 && csd_struct != 2) {
666 printk("%s: unrecognised CSD structure version %d\n",
667 mmc_hostname(card->host), csd_struct);
668 mmc_card_set_bad(card);
669 return;
670 }
671
672 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
673 m = UNSTUFF_BITS(resp, 115, 4);
674 e = UNSTUFF_BITS(resp, 112, 3);
675 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
676 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
677
678 m = UNSTUFF_BITS(resp, 99, 4);
679 e = UNSTUFF_BITS(resp, 96, 3);
680 csd->max_dtr = tran_exp[e] * tran_mant[m];
681 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
682
683 e = UNSTUFF_BITS(resp, 47, 3);
684 m = UNSTUFF_BITS(resp, 62, 12);
685 csd->capacity = (1 + m) << (e + 2);
686
687 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
688 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
689 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
690 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
691 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
692 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
693 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
694 }
695 }
696
697 /*
698 * Given a 64-bit response, decode to our card SCR structure.
699 */
700 static void mmc_decode_scr(struct mmc_card *card)
701 {
702 struct sd_scr *scr = &card->scr;
703 unsigned int scr_struct;
704 u32 resp[4];
705
706 BUG_ON(!mmc_card_sd(card));
707
708 resp[3] = card->raw_scr[1];
709 resp[2] = card->raw_scr[0];
710
711 scr_struct = UNSTUFF_BITS(resp, 60, 4);
712 if (scr_struct != 0) {
713 printk("%s: unrecognised SCR structure version %d\n",
714 mmc_hostname(card->host), scr_struct);
715 mmc_card_set_bad(card);
716 return;
717 }
718
719 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
720 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
721 }
722
723 /*
724 * Locate a MMC card on this MMC host given a raw CID.
725 */
726 static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid)
727 {
728 struct mmc_card *card;
729
730 list_for_each_entry(card, &host->cards, node) {
731 if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0)
732 return card;
733 }
734 return NULL;
735 }
736
737 /*
738 * Allocate a new MMC card, and assign a unique RCA.
739 */
740 static struct mmc_card *
741 mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca)
742 {
743 struct mmc_card *card, *c;
744 unsigned int rca = *frca;
745
746 card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL);
747 if (!card)
748 return ERR_PTR(-ENOMEM);
749
750 mmc_init_card(card, host);
751 memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid));
752
753 again:
754 list_for_each_entry(c, &host->cards, node)
755 if (c->rca == rca) {
756 rca++;
757 goto again;
758 }
759
760 card->rca = rca;
761
762 *frca = rca;
763
764 return card;
765 }
766
767 /*
768 * Tell attached cards to go to IDLE state
769 */
770 static void mmc_idle_cards(struct mmc_host *host)
771 {
772 struct mmc_command cmd;
773
774 host->ios.chip_select = MMC_CS_HIGH;
775 mmc_set_ios(host);
776
777 mmc_delay(1);
778
779 cmd.opcode = MMC_GO_IDLE_STATE;
780 cmd.arg = 0;
781 cmd.flags = MMC_RSP_NONE | MMC_CMD_BC;
782
783 mmc_wait_for_cmd(host, &cmd, 0);
784
785 mmc_delay(1);
786
787 host->ios.chip_select = MMC_CS_DONTCARE;
788 mmc_set_ios(host);
789
790 mmc_delay(1);
791 }
792
793 /*
794 * Apply power to the MMC stack. This is a two-stage process.
795 * First, we enable power to the card without the clock running.
796 * We then wait a bit for the power to stabilise. Finally,
797 * enable the bus drivers and clock to the card.
798 *
799 * We must _NOT_ enable the clock prior to power stablising.
800 *
801 * If a host does all the power sequencing itself, ignore the
802 * initial MMC_POWER_UP stage.
803 */
804 static void mmc_power_up(struct mmc_host *host)
805 {
806 int bit = fls(host->ocr_avail) - 1;
807
808 host->ios.vdd = bit;
809 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
810 host->ios.chip_select = MMC_CS_DONTCARE;
811 host->ios.power_mode = MMC_POWER_UP;
812 host->ios.bus_width = MMC_BUS_WIDTH_1;
813 host->ios.timing = MMC_TIMING_LEGACY;
814 mmc_set_ios(host);
815
816 mmc_delay(1);
817
818 host->ios.clock = host->f_min;
819 host->ios.power_mode = MMC_POWER_ON;
820 mmc_set_ios(host);
821
822 mmc_delay(2);
823 }
824
825 static void mmc_power_off(struct mmc_host *host)
826 {
827 host->ios.clock = 0;
828 host->ios.vdd = 0;
829 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
830 host->ios.chip_select = MMC_CS_DONTCARE;
831 host->ios.power_mode = MMC_POWER_OFF;
832 host->ios.bus_width = MMC_BUS_WIDTH_1;
833 host->ios.timing = MMC_TIMING_LEGACY;
834 mmc_set_ios(host);
835 }
836
837 static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
838 {
839 struct mmc_command cmd;
840 int i, err = 0;
841
842 cmd.opcode = MMC_SEND_OP_COND;
843 cmd.arg = ocr;
844 cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
845
846 for (i = 100; i; i--) {
847 err = mmc_wait_for_cmd(host, &cmd, 0);
848 if (err != MMC_ERR_NONE)
849 break;
850
851 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
852 break;
853
854 err = MMC_ERR_TIMEOUT;
855
856 mmc_delay(10);
857 }
858
859 if (rocr)
860 *rocr = cmd.resp[0];
861
862 return err;
863 }
864
865 static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
866 {
867 struct mmc_command cmd;
868 int i, err = 0;
869
870 cmd.opcode = SD_APP_OP_COND;
871 cmd.arg = ocr;
872 cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
873
874 for (i = 100; i; i--) {
875 err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES);
876 if (err != MMC_ERR_NONE)
877 break;
878
879 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
880 break;
881
882 err = MMC_ERR_TIMEOUT;
883
884 mmc_delay(10);
885 }
886
887 if (rocr)
888 *rocr = cmd.resp[0];
889
890 return err;
891 }
892
893 static int mmc_send_if_cond(struct mmc_host *host, u32 ocr, int *rsd2)
894 {
895 struct mmc_command cmd;
896 int err, sd2;
897 static const u8 test_pattern = 0xAA;
898
899 /*
900 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
901 * before SD_APP_OP_COND. This command will harmlessly fail for
902 * SD 1.0 cards.
903 */
904 cmd.opcode = SD_SEND_IF_COND;
905 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
906 cmd.flags = MMC_RSP_R7 | MMC_CMD_BCR;
907
908 err = mmc_wait_for_cmd(host, &cmd, 0);
909 if (err == MMC_ERR_NONE) {
910 if ((cmd.resp[0] & 0xFF) == test_pattern) {
911 sd2 = 1;
912 } else {
913 sd2 = 0;
914 err = MMC_ERR_FAILED;
915 }
916 } else {
917 /*
918 * Treat errors as SD 1.0 card.
919 */
920 sd2 = 0;
921 err = MMC_ERR_NONE;
922 }
923 if (rsd2)
924 *rsd2 = sd2;
925 return err;
926 }
927
928 /*
929 * Discover cards by requesting their CID. If this command
930 * times out, it is not an error; there are no further cards
931 * to be discovered. Add new cards to the list.
932 *
933 * Create a mmc_card entry for each discovered card, assigning
934 * it an RCA, and save the raw CID for decoding later.
935 */
936 static void mmc_discover_cards(struct mmc_host *host)
937 {
938 struct mmc_card *card;
939 unsigned int first_rca = 1, err;
940
941 while (1) {
942 struct mmc_command cmd;
943
944 cmd.opcode = MMC_ALL_SEND_CID;
945 cmd.arg = 0;
946 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
947
948 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
949 if (err == MMC_ERR_TIMEOUT) {
950 err = MMC_ERR_NONE;
951 break;
952 }
953 if (err != MMC_ERR_NONE) {
954 printk(KERN_ERR "%s: error requesting CID: %d\n",
955 mmc_hostname(host), err);
956 break;
957 }
958
959 card = mmc_find_card(host, cmd.resp);
960 if (!card) {
961 card = mmc_alloc_card(host, cmd.resp, &first_rca);
962 if (IS_ERR(card)) {
963 err = PTR_ERR(card);
964 break;
965 }
966 list_add(&card->node, &host->cards);
967 }
968
969 card->state &= ~MMC_STATE_DEAD;
970
971 if (host->mode == MMC_MODE_SD) {
972 mmc_card_set_sd(card);
973
974 cmd.opcode = SD_SEND_RELATIVE_ADDR;
975 cmd.arg = 0;
976 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
977
978 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
979 if (err != MMC_ERR_NONE)
980 mmc_card_set_dead(card);
981 else {
982 card->rca = cmd.resp[0] >> 16;
983
984 if (!host->ops->get_ro) {
985 printk(KERN_WARNING "%s: host does not "
986 "support reading read-only "
987 "switch. assuming write-enable.\n",
988 mmc_hostname(host));
989 } else {
990 if (host->ops->get_ro(host))
991 mmc_card_set_readonly(card);
992 }
993 }
994 } else {
995 cmd.opcode = MMC_SET_RELATIVE_ADDR;
996 cmd.arg = card->rca << 16;
997 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
998
999 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1000 if (err != MMC_ERR_NONE)
1001 mmc_card_set_dead(card);
1002 }
1003 }
1004 }
1005
1006 static void mmc_read_csds(struct mmc_host *host)
1007 {
1008 struct mmc_card *card;
1009
1010 list_for_each_entry(card, &host->cards, node) {
1011 struct mmc_command cmd;
1012 int err;
1013
1014 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
1015 continue;
1016
1017 cmd.opcode = MMC_SEND_CSD;
1018 cmd.arg = card->rca << 16;
1019 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
1020
1021 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1022 if (err != MMC_ERR_NONE) {
1023 mmc_card_set_dead(card);
1024 continue;
1025 }
1026
1027 memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd));
1028
1029 mmc_decode_csd(card);
1030 mmc_decode_cid(card);
1031 }
1032 }
1033
1034 static void mmc_process_ext_csds(struct mmc_host *host)
1035 {
1036 int err;
1037 struct mmc_card *card;
1038
1039 struct mmc_request mrq;
1040 struct mmc_command cmd;
1041 struct mmc_data data;
1042
1043 struct scatterlist sg;
1044
1045 /*
1046 * As the ext_csd is so large and mostly unused, we don't store the
1047 * raw block in mmc_card.
1048 */
1049 u8 *ext_csd;
1050 ext_csd = kmalloc(512, GFP_KERNEL);
1051 if (!ext_csd) {
1052 printk("%s: could not allocate a buffer to receive the ext_csd."
1053 "mmc v4 cards will be treated as v3.\n",
1054 mmc_hostname(host));
1055 return;
1056 }
1057
1058 list_for_each_entry(card, &host->cards, node) {
1059 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
1060 continue;
1061 if (mmc_card_sd(card))
1062 continue;
1063 if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
1064 continue;
1065
1066 err = mmc_select_card(host, card);
1067 if (err != MMC_ERR_NONE) {
1068 mmc_card_set_dead(card);
1069 continue;
1070 }
1071
1072 memset(&cmd, 0, sizeof(struct mmc_command));
1073
1074 cmd.opcode = MMC_SEND_EXT_CSD;
1075 cmd.arg = 0;
1076 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1077
1078 memset(&data, 0, sizeof(struct mmc_data));
1079
1080 mmc_set_data_timeout(&data, card, 0);
1081
1082 data.blksz = 512;
1083 data.blocks = 1;
1084 data.flags = MMC_DATA_READ;
1085 data.sg = &sg;
1086 data.sg_len = 1;
1087
1088 memset(&mrq, 0, sizeof(struct mmc_request));
1089
1090 mrq.cmd = &cmd;
1091 mrq.data = &data;
1092
1093 sg_init_one(&sg, ext_csd, 512);
1094
1095 mmc_wait_for_req(host, &mrq);
1096
1097 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
1098 printk("%s: unable to read EXT_CSD, performance "
1099 "might suffer.\n", mmc_hostname(card->host));
1100 continue;
1101 }
1102
1103 switch (ext_csd[EXT_CSD_CARD_TYPE]) {
1104 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
1105 card->ext_csd.hs_max_dtr = 52000000;
1106 break;
1107 case EXT_CSD_CARD_TYPE_26:
1108 card->ext_csd.hs_max_dtr = 26000000;
1109 break;
1110 default:
1111 /* MMC v4 spec says this cannot happen */
1112 printk("%s: card is mmc v4 but doesn't support "
1113 "any high-speed modes.\n",
1114 mmc_hostname(card->host));
1115 continue;
1116 }
1117
1118 if (host->caps & MMC_CAP_MMC_HIGHSPEED) {
1119 /* Activate highspeed support. */
1120 cmd.opcode = MMC_SWITCH;
1121 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
1122 (EXT_CSD_HS_TIMING << 16) |
1123 (1 << 8) |
1124 EXT_CSD_CMD_SET_NORMAL;
1125 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1126
1127 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1128 if (err != MMC_ERR_NONE) {
1129 printk("%s: failed to switch card to mmc v4 "
1130 "high-speed mode.\n",
1131 mmc_hostname(card->host));
1132 continue;
1133 }
1134
1135 mmc_card_set_highspeed(card);
1136
1137 host->ios.timing = MMC_TIMING_SD_HS;
1138 mmc_set_ios(host);
1139 }
1140
1141 /* Check for host support for wide-bus modes. */
1142 if (host->caps & MMC_CAP_4_BIT_DATA) {
1143 /* Activate 4-bit support. */
1144 cmd.opcode = MMC_SWITCH;
1145 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
1146 (EXT_CSD_BUS_WIDTH << 16) |
1147 (EXT_CSD_BUS_WIDTH_4 << 8) |
1148 EXT_CSD_CMD_SET_NORMAL;
1149 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1150
1151 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1152 if (err != MMC_ERR_NONE) {
1153 printk("%s: failed to switch card to "
1154 "mmc v4 4-bit bus mode.\n",
1155 mmc_hostname(card->host));
1156 continue;
1157 }
1158
1159 host->ios.bus_width = MMC_BUS_WIDTH_4;
1160 mmc_set_ios(host);
1161 }
1162 }
1163
1164 kfree(ext_csd);
1165
1166 mmc_deselect_cards(host);
1167 }
1168
1169 static void mmc_read_scrs(struct mmc_host *host)
1170 {
1171 int err;
1172 struct mmc_card *card;
1173 struct mmc_request mrq;
1174 struct mmc_command cmd;
1175 struct mmc_data data;
1176 struct scatterlist sg;
1177
1178 list_for_each_entry(card, &host->cards, node) {
1179 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
1180 continue;
1181 if (!mmc_card_sd(card))
1182 continue;
1183
1184 err = mmc_select_card(host, card);
1185 if (err != MMC_ERR_NONE) {
1186 mmc_card_set_dead(card);
1187 continue;
1188 }
1189
1190 memset(&cmd, 0, sizeof(struct mmc_command));
1191
1192 cmd.opcode = MMC_APP_CMD;
1193 cmd.arg = card->rca << 16;
1194 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1195
1196 err = mmc_wait_for_cmd(host, &cmd, 0);
1197 if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) {
1198 mmc_card_set_dead(card);
1199 continue;
1200 }
1201
1202 memset(&cmd, 0, sizeof(struct mmc_command));
1203
1204 cmd.opcode = SD_APP_SEND_SCR;
1205 cmd.arg = 0;
1206 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1207
1208 memset(&data, 0, sizeof(struct mmc_data));
1209
1210 mmc_set_data_timeout(&data, card, 0);
1211
1212 data.blksz = 1 << 3;
1213 data.blocks = 1;
1214 data.flags = MMC_DATA_READ;
1215 data.sg = &sg;
1216 data.sg_len = 1;
1217
1218 memset(&mrq, 0, sizeof(struct mmc_request));
1219
1220 mrq.cmd = &cmd;
1221 mrq.data = &data;
1222
1223 sg_init_one(&sg, (u8*)card->raw_scr, 8);
1224
1225 mmc_wait_for_req(host, &mrq);
1226
1227 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
1228 mmc_card_set_dead(card);
1229 continue;
1230 }
1231
1232 card->raw_scr[0] = ntohl(card->raw_scr[0]);
1233 card->raw_scr[1] = ntohl(card->raw_scr[1]);
1234
1235 mmc_decode_scr(card);
1236 }
1237
1238 mmc_deselect_cards(host);
1239 }
1240
1241 static void mmc_read_switch_caps(struct mmc_host *host)
1242 {
1243 int err;
1244 struct mmc_card *card;
1245 struct mmc_request mrq;
1246 struct mmc_command cmd;
1247 struct mmc_data data;
1248 unsigned char *status;
1249 struct scatterlist sg;
1250
1251 if (!(host->caps & MMC_CAP_SD_HIGHSPEED))
1252 return;
1253
1254 status = kmalloc(64, GFP_KERNEL);
1255 if (!status) {
1256 printk(KERN_WARNING "%s: Unable to allocate buffer for "
1257 "reading switch capabilities.\n",
1258 mmc_hostname(host));
1259 return;
1260 }
1261
1262 list_for_each_entry(card, &host->cards, node) {
1263 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
1264 continue;
1265 if (!mmc_card_sd(card))
1266 continue;
1267 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
1268 continue;
1269
1270 err = mmc_select_card(host, card);
1271 if (err != MMC_ERR_NONE) {
1272 mmc_card_set_dead(card);
1273 continue;
1274 }
1275
1276 memset(&cmd, 0, sizeof(struct mmc_command));
1277
1278 cmd.opcode = SD_SWITCH;
1279 cmd.arg = 0x00FFFFF1;
1280 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1281
1282 memset(&data, 0, sizeof(struct mmc_data));
1283
1284 mmc_set_data_timeout(&data, card, 0);
1285
1286 data.blksz = 64;
1287 data.blocks = 1;
1288 data.flags = MMC_DATA_READ;
1289 data.sg = &sg;
1290 data.sg_len = 1;
1291
1292 memset(&mrq, 0, sizeof(struct mmc_request));
1293
1294 mrq.cmd = &cmd;
1295 mrq.data = &data;
1296
1297 sg_init_one(&sg, status, 64);
1298
1299 mmc_wait_for_req(host, &mrq);
1300
1301 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
1302 printk("%s: unable to read switch capabilities, "
1303 "performance might suffer.\n",
1304 mmc_hostname(card->host));
1305 continue;
1306 }
1307
1308 if (status[13] & 0x02)
1309 card->sw_caps.hs_max_dtr = 50000000;
1310
1311 memset(&cmd, 0, sizeof(struct mmc_command));
1312
1313 cmd.opcode = SD_SWITCH;
1314 cmd.arg = 0x80FFFFF1;
1315 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1316
1317 memset(&data, 0, sizeof(struct mmc_data));
1318
1319 mmc_set_data_timeout(&data, card, 0);
1320
1321 data.blksz = 64;
1322 data.blocks = 1;
1323 data.flags = MMC_DATA_READ;
1324 data.sg = &sg;
1325 data.sg_len = 1;
1326
1327 memset(&mrq, 0, sizeof(struct mmc_request));
1328
1329 mrq.cmd = &cmd;
1330 mrq.data = &data;
1331
1332 sg_init_one(&sg, status, 64);
1333
1334 mmc_wait_for_req(host, &mrq);
1335
1336 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE ||
1337 (status[16] & 0xF) != 1) {
1338 printk(KERN_WARNING "%s: Problem switching card "
1339 "into high-speed mode!\n",
1340 mmc_hostname(host));
1341 continue;
1342 }
1343
1344 mmc_card_set_highspeed(card);
1345
1346 host->ios.timing = MMC_TIMING_SD_HS;
1347 mmc_set_ios(host);
1348 }
1349
1350 kfree(status);
1351
1352 mmc_deselect_cards(host);
1353 }
1354
1355 static unsigned int mmc_calculate_clock(struct mmc_host *host)
1356 {
1357 struct mmc_card *card;
1358 unsigned int max_dtr = host->f_max;
1359
1360 list_for_each_entry(card, &host->cards, node)
1361 if (!mmc_card_dead(card)) {
1362 if (mmc_card_highspeed(card) && mmc_card_sd(card)) {
1363 if (max_dtr > card->sw_caps.hs_max_dtr)
1364 max_dtr = card->sw_caps.hs_max_dtr;
1365 } else if (mmc_card_highspeed(card) && !mmc_card_sd(card)) {
1366 if (max_dtr > card->ext_csd.hs_max_dtr)
1367 max_dtr = card->ext_csd.hs_max_dtr;
1368 } else if (max_dtr > card->csd.max_dtr) {
1369 max_dtr = card->csd.max_dtr;
1370 }
1371 }
1372
1373 pr_debug("%s: selected %d.%03dMHz transfer rate\n",
1374 mmc_hostname(host),
1375 max_dtr / 1000000, (max_dtr / 1000) % 1000);
1376
1377 return max_dtr;
1378 }
1379
1380 /*
1381 * Check whether cards we already know about are still present.
1382 * We do this by requesting status, and checking whether a card
1383 * responds.
1384 *
1385 * A request for status does not cause a state change in data
1386 * transfer mode.
1387 */
1388 static void mmc_check_cards(struct mmc_host *host)
1389 {
1390 struct list_head *l, *n;
1391
1392 mmc_deselect_cards(host);
1393
1394 list_for_each_safe(l, n, &host->cards) {
1395 struct mmc_card *card = mmc_list_to_card(l);
1396 struct mmc_command cmd;
1397 int err;
1398
1399 cmd.opcode = MMC_SEND_STATUS;
1400 cmd.arg = card->rca << 16;
1401 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1402
1403 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1404 if (err == MMC_ERR_NONE)
1405 continue;
1406
1407 mmc_card_set_dead(card);
1408 }
1409 }
1410
1411 static void mmc_setup(struct mmc_host *host)
1412 {
1413 if (host->ios.power_mode != MMC_POWER_ON) {
1414 int err;
1415 u32 ocr;
1416
1417 host->mode = MMC_MODE_SD;
1418
1419 mmc_power_up(host);
1420 mmc_idle_cards(host);
1421
1422 err = mmc_send_if_cond(host, host->ocr_avail, NULL);
1423 if (err != MMC_ERR_NONE) {
1424 return;
1425 }
1426 err = mmc_send_app_op_cond(host, 0, &ocr);
1427
1428 /*
1429 * If we fail to detect any SD cards then try
1430 * searching for MMC cards.
1431 */
1432 if (err != MMC_ERR_NONE) {
1433 host->mode = MMC_MODE_MMC;
1434
1435 err = mmc_send_op_cond(host, 0, &ocr);
1436 if (err != MMC_ERR_NONE)
1437 return;
1438 }
1439
1440 host->ocr = mmc_select_voltage(host, ocr);
1441
1442 /*
1443 * Since we're changing the OCR value, we seem to
1444 * need to tell some cards to go back to the idle
1445 * state. We wait 1ms to give cards time to
1446 * respond.
1447 */
1448 if (host->ocr)
1449 mmc_idle_cards(host);
1450 } else {
1451 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1452 host->ios.clock = host->f_min;
1453 mmc_set_ios(host);
1454
1455 /*
1456 * We should remember the OCR mask from the existing
1457 * cards, and detect the new cards OCR mask, combine
1458 * the two and re-select the VDD. However, if we do
1459 * change VDD, we should do an idle, and then do a
1460 * full re-initialisation. We would need to notify
1461 * drivers so that they can re-setup the cards as
1462 * well, while keeping their queues at bay.
1463 *
1464 * For the moment, we take the easy way out - if the
1465 * new cards don't like our currently selected VDD,
1466 * they drop off the bus.
1467 */
1468 }
1469
1470 if (host->ocr == 0)
1471 return;
1472
1473 /*
1474 * Send the selected OCR multiple times... until the cards
1475 * all get the idea that they should be ready for CMD2.
1476 * (My SanDisk card seems to need this.)
1477 */
1478 if (host->mode == MMC_MODE_SD) {
1479 int err, sd2;
1480 err = mmc_send_if_cond(host, host->ocr, &sd2);
1481 if (err == MMC_ERR_NONE) {
1482 /*
1483 * If SD_SEND_IF_COND indicates an SD 2.0
1484 * compliant card and we should set bit 30
1485 * of the ocr to indicate that we can handle
1486 * block-addressed SDHC cards.
1487 */
1488 mmc_send_app_op_cond(host, host->ocr | (sd2 << 30), NULL);
1489 }
1490 } else {
1491 mmc_send_op_cond(host, host->ocr, NULL);
1492 }
1493
1494 mmc_discover_cards(host);
1495
1496 /*
1497 * Ok, now switch to push-pull mode.
1498 */
1499 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1500 mmc_set_ios(host);
1501
1502 mmc_read_csds(host);
1503
1504 if (host->mode == MMC_MODE_SD) {
1505 mmc_read_scrs(host);
1506 mmc_read_switch_caps(host);
1507 } else
1508 mmc_process_ext_csds(host);
1509 }
1510
1511
1512 /**
1513 * mmc_detect_change - process change of state on a MMC socket
1514 * @host: host which changed state.
1515 * @delay: optional delay to wait before detection (jiffies)
1516 *
1517 * All we know is that card(s) have been inserted or removed
1518 * from the socket(s). We don't know which socket or cards.
1519 */
1520 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1521 {
1522 mmc_schedule_delayed_work(&host->detect, delay);
1523 }
1524
1525 EXPORT_SYMBOL(mmc_detect_change);
1526
1527
1528 static void mmc_rescan(struct work_struct *work)
1529 {
1530 struct mmc_host *host =
1531 container_of(work, struct mmc_host, detect.work);
1532 struct list_head *l, *n;
1533 unsigned char power_mode;
1534
1535 mmc_claim_host(host);
1536
1537 /*
1538 * Check for removed cards and newly inserted ones. We check for
1539 * removed cards first so we can intelligently re-select the VDD.
1540 */
1541 power_mode = host->ios.power_mode;
1542 if (power_mode == MMC_POWER_ON)
1543 mmc_check_cards(host);
1544
1545 mmc_setup(host);
1546
1547 /*
1548 * Some broken cards process CMD1 even in stand-by state. There is
1549 * no reply, but an ILLEGAL_COMMAND error is cached and returned
1550 * after next command. We poll for card status here to clear any
1551 * possibly pending error.
1552 */
1553 if (power_mode == MMC_POWER_ON)
1554 mmc_check_cards(host);
1555
1556 if (!list_empty(&host->cards)) {
1557 /*
1558 * (Re-)calculate the fastest clock rate which the
1559 * attached cards and the host support.
1560 */
1561 host->ios.clock = mmc_calculate_clock(host);
1562 mmc_set_ios(host);
1563 }
1564
1565 mmc_release_host(host);
1566
1567 list_for_each_safe(l, n, &host->cards) {
1568 struct mmc_card *card = mmc_list_to_card(l);
1569
1570 /*
1571 * If this is a new and good card, register it.
1572 */
1573 if (!mmc_card_present(card) && !mmc_card_dead(card)) {
1574 if (mmc_register_card(card))
1575 mmc_card_set_dead(card);
1576 else
1577 mmc_card_set_present(card);
1578 }
1579
1580 /*
1581 * If this card is dead, destroy it.
1582 */
1583 if (mmc_card_dead(card)) {
1584 list_del(&card->node);
1585 mmc_remove_card(card);
1586 }
1587 }
1588
1589 /*
1590 * If we discover that there are no cards on the
1591 * bus, turn off the clock and power down.
1592 */
1593 if (list_empty(&host->cards))
1594 mmc_power_off(host);
1595 }
1596
1597
1598 /**
1599 * mmc_alloc_host - initialise the per-host structure.
1600 * @extra: sizeof private data structure
1601 * @dev: pointer to host device model structure
1602 *
1603 * Initialise the per-host structure.
1604 */
1605 struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
1606 {
1607 struct mmc_host *host;
1608
1609 host = mmc_alloc_host_sysfs(extra, dev);
1610 if (host) {
1611 spin_lock_init(&host->lock);
1612 init_waitqueue_head(&host->wq);
1613 INIT_LIST_HEAD(&host->cards);
1614 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
1615
1616 /*
1617 * By default, hosts do not support SGIO or large requests.
1618 * They have to set these according to their abilities.
1619 */
1620 host->max_hw_segs = 1;
1621 host->max_phys_segs = 1;
1622 host->max_seg_size = PAGE_CACHE_SIZE;
1623
1624 host->max_req_size = PAGE_CACHE_SIZE;
1625 host->max_blk_size = 512;
1626 host->max_blk_count = PAGE_CACHE_SIZE / 512;
1627 }
1628
1629 return host;
1630 }
1631
1632 EXPORT_SYMBOL(mmc_alloc_host);
1633
1634 /**
1635 * mmc_add_host - initialise host hardware
1636 * @host: mmc host
1637 */
1638 int mmc_add_host(struct mmc_host *host)
1639 {
1640 int ret;
1641
1642 ret = mmc_add_host_sysfs(host);
1643 if (ret == 0) {
1644 mmc_power_off(host);
1645 mmc_detect_change(host, 0);
1646 }
1647
1648 return ret;
1649 }
1650
1651 EXPORT_SYMBOL(mmc_add_host);
1652
1653 /**
1654 * mmc_remove_host - remove host hardware
1655 * @host: mmc host
1656 *
1657 * Unregister and remove all cards associated with this host,
1658 * and power down the MMC bus.
1659 */
1660 void mmc_remove_host(struct mmc_host *host)
1661 {
1662 struct list_head *l, *n;
1663
1664 list_for_each_safe(l, n, &host->cards) {
1665 struct mmc_card *card = mmc_list_to_card(l);
1666
1667 mmc_remove_card(card);
1668 }
1669
1670 mmc_power_off(host);
1671 mmc_remove_host_sysfs(host);
1672 }
1673
1674 EXPORT_SYMBOL(mmc_remove_host);
1675
1676 /**
1677 * mmc_free_host - free the host structure
1678 * @host: mmc host
1679 *
1680 * Free the host once all references to it have been dropped.
1681 */
1682 void mmc_free_host(struct mmc_host *host)
1683 {
1684 mmc_flush_scheduled_work();
1685 mmc_free_host_sysfs(host);
1686 }
1687
1688 EXPORT_SYMBOL(mmc_free_host);
1689
1690 #ifdef CONFIG_PM
1691
1692 /**
1693 * mmc_suspend_host - suspend a host
1694 * @host: mmc host
1695 * @state: suspend mode (PM_SUSPEND_xxx)
1696 */
1697 int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
1698 {
1699 mmc_claim_host(host);
1700 mmc_deselect_cards(host);
1701 mmc_power_off(host);
1702 mmc_release_host(host);
1703
1704 return 0;
1705 }
1706
1707 EXPORT_SYMBOL(mmc_suspend_host);
1708
1709 /**
1710 * mmc_resume_host - resume a previously suspended host
1711 * @host: mmc host
1712 */
1713 int mmc_resume_host(struct mmc_host *host)
1714 {
1715 mmc_rescan(&host->detect.work);
1716
1717 return 0;
1718 }
1719
1720 EXPORT_SYMBOL(mmc_resume_host);
1721
1722 #endif
1723
1724 MODULE_LICENSE("GPL");
Linux with added FPC-III support