?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
mmc: enforce correct sg list
[linux-2.6/mini2440.git] / drivers / mmc / mmc.c
blobe8f896c61b3474a592a1303275230dab070e6b1f
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 #ifdef CONFIG_MMC_DEBUG
103 unsigned int i, sz;
104 #endif
105
106 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
107 mmc_hostname(host), mrq->cmd->opcode,
108 mrq->cmd->arg, mrq->cmd->flags);
109
110 WARN_ON(!host->claimed);
111
112 mrq->cmd->error = 0;
113 mrq->cmd->mrq = mrq;
114 if (mrq->data) {
115 BUG_ON(mrq->data->blksz > host->max_blk_size);
116 BUG_ON(mrq->data->blocks > host->max_blk_count);
117 BUG_ON(mrq->data->blocks * mrq->data->blksz >
118 host->max_req_size);
119
120 #ifdef CONFIG_MMC_DEBUG
121 sz = 0;
122 for (i = 0;i < mrq->data->sg_len;i++)
123 sz += mrq->data->sg[i].length;
124 BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
125 #endif
126
127 mrq->cmd->data = mrq->data;
128 mrq->data->error = 0;
129 mrq->data->mrq = mrq;
130 if (mrq->stop) {
131 mrq->data->stop = mrq->stop;
132 mrq->stop->error = 0;
133 mrq->stop->mrq = mrq;
134 }
135 }
136 host->ops->request(host, mrq);
137 }
138
139 EXPORT_SYMBOL(mmc_start_request);
140
141 static void mmc_wait_done(struct mmc_request *mrq)
142 {
143 complete(mrq->done_data);
144 }
145
146 int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
147 {
148 DECLARE_COMPLETION_ONSTACK(complete);
149
150 mrq->done_data = &complete;
151 mrq->done = mmc_wait_done;
152
153 mmc_start_request(host, mrq);
154
155 wait_for_completion(&complete);
156
157 return 0;
158 }
159
160 EXPORT_SYMBOL(mmc_wait_for_req);
161
162 /**
163 * mmc_wait_for_cmd - start a command and wait for completion
164 * @host: MMC host to start command
165 * @cmd: MMC command to start
166 * @retries: maximum number of retries
167 *
168 * Start a new MMC command for a host, and wait for the command
169 * to complete. Return any error that occurred while the command
170 * was executing. Do not attempt to parse the response.
171 */
172 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
173 {
174 struct mmc_request mrq;
175
176 BUG_ON(!host->claimed);
177
178 memset(&mrq, 0, sizeof(struct mmc_request));
179
180 memset(cmd->resp, 0, sizeof(cmd->resp));
181 cmd->retries = retries;
182
183 mrq.cmd = cmd;
184 cmd->data = NULL;
185
186 mmc_wait_for_req(host, &mrq);
187
188 return cmd->error;
189 }
190
191 EXPORT_SYMBOL(mmc_wait_for_cmd);
192
193 /**
194 * mmc_wait_for_app_cmd - start an application command and wait for
195 completion
196 * @host: MMC host to start command
197 * @rca: RCA to send MMC_APP_CMD to
198 * @cmd: MMC command to start
199 * @retries: maximum number of retries
200 *
201 * Sends a MMC_APP_CMD, checks the card response, sends the command
202 * in the parameter and waits for it to complete. Return any error
203 * that occurred while the command was executing. Do not attempt to
204 * parse the response.
205 */
206 int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca,
207 struct mmc_command *cmd, int retries)
208 {
209 struct mmc_request mrq;
210 struct mmc_command appcmd;
211
212 int i, err;
213
214 BUG_ON(!host->claimed);
215 BUG_ON(retries < 0);
216
217 err = MMC_ERR_INVALID;
218
219 /*
220 * We have to resend MMC_APP_CMD for each attempt so
221 * we cannot use the retries field in mmc_command.
222 */
223 for (i = 0;i <= retries;i++) {
224 memset(&mrq, 0, sizeof(struct mmc_request));
225
226 appcmd.opcode = MMC_APP_CMD;
227 appcmd.arg = rca << 16;
228 appcmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
229 appcmd.retries = 0;
230 memset(appcmd.resp, 0, sizeof(appcmd.resp));
231 appcmd.data = NULL;
232
233 mrq.cmd = &appcmd;
234 appcmd.data = NULL;
235
236 mmc_wait_for_req(host, &mrq);
237
238 if (appcmd.error) {
239 err = appcmd.error;
240 continue;
241 }
242
243 /* Check that card supported application commands */
244 if (!(appcmd.resp[0] & R1_APP_CMD))
245 return MMC_ERR_FAILED;
246
247 memset(&mrq, 0, sizeof(struct mmc_request));
248
249 memset(cmd->resp, 0, sizeof(cmd->resp));
250 cmd->retries = 0;
251
252 mrq.cmd = cmd;
253 cmd->data = NULL;
254
255 mmc_wait_for_req(host, &mrq);
256
257 err = cmd->error;
258 if (cmd->error == MMC_ERR_NONE)
259 break;
260 }
261
262 return err;
263 }
264
265 EXPORT_SYMBOL(mmc_wait_for_app_cmd);
266
267 /**
268 * mmc_set_data_timeout - set the timeout for a data command
269 * @data: data phase for command
270 * @card: the MMC card associated with the data transfer
271 * @write: flag to differentiate reads from writes
272 */
273 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card,
274 int write)
275 {
276 unsigned int mult;
277
278 /*
279 * SD cards use a 100 multiplier rather than 10
280 */
281 mult = mmc_card_sd(card) ? 100 : 10;
282
283 /*
284 * Scale up the multiplier (and therefore the timeout) by
285 * the r2w factor for writes.
286 */
287 if (write)
288 mult <<= card->csd.r2w_factor;
289
290 data->timeout_ns = card->csd.tacc_ns * mult;
291 data->timeout_clks = card->csd.tacc_clks * mult;
292
293 /*
294 * SD cards also have an upper limit on the timeout.
295 */
296 if (mmc_card_sd(card)) {
297 unsigned int timeout_us, limit_us;
298
299 timeout_us = data->timeout_ns / 1000;
300 timeout_us += data->timeout_clks * 1000 /
301 (card->host->ios.clock / 1000);
302
303 if (write)
304 limit_us = 250000;
305 else
306 limit_us = 100000;
307
308 /*
309 * SDHC cards always use these fixed values.
310 */
311 if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
312 data->timeout_ns = limit_us * 1000;
313 data->timeout_clks = 0;
314 }
315 }
316 }
317 EXPORT_SYMBOL(mmc_set_data_timeout);
318
319 static int mmc_select_card(struct mmc_host *host, struct mmc_card *card);
320
321 /**
322 * __mmc_claim_host - exclusively claim a host
323 * @host: mmc host to claim
324 * @card: mmc card to claim host for
325 *
326 * Claim a host for a set of operations. If a valid card
327 * is passed and this wasn't the last card selected, select
328 * the card before returning.
329 *
330 * Note: you should use mmc_card_claim_host or mmc_claim_host.
331 */
332 int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card)
333 {
334 DECLARE_WAITQUEUE(wait, current);
335 unsigned long flags;
336 int err = 0;
337
338 add_wait_queue(&host->wq, &wait);
339 spin_lock_irqsave(&host->lock, flags);
340 while (1) {
341 set_current_state(TASK_UNINTERRUPTIBLE);
342 if (!host->claimed)
343 break;
344 spin_unlock_irqrestore(&host->lock, flags);
345 schedule();
346 spin_lock_irqsave(&host->lock, flags);
347 }
348 set_current_state(TASK_RUNNING);
349 host->claimed = 1;
350 spin_unlock_irqrestore(&host->lock, flags);
351 remove_wait_queue(&host->wq, &wait);
352
353 if (card != (void *)-1) {
354 err = mmc_select_card(host, card);
355 if (err != MMC_ERR_NONE)
356 return err;
357 }
358
359 return err;
360 }
361
362 EXPORT_SYMBOL(__mmc_claim_host);
363
364 /**
365 * mmc_release_host - release a host
366 * @host: mmc host to release
367 *
368 * Release a MMC host, allowing others to claim the host
369 * for their operations.
370 */
371 void mmc_release_host(struct mmc_host *host)
372 {
373 unsigned long flags;
374
375 BUG_ON(!host->claimed);
376
377 spin_lock_irqsave(&host->lock, flags);
378 host->claimed = 0;
379 spin_unlock_irqrestore(&host->lock, flags);
380
381 wake_up(&host->wq);
382 }
383
384 EXPORT_SYMBOL(mmc_release_host);
385
386 static inline void mmc_set_ios(struct mmc_host *host)
387 {
388 struct mmc_ios *ios = &host->ios;
389
390 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
391 "width %u timing %u\n",
392 mmc_hostname(host), ios->clock, ios->bus_mode,
393 ios->power_mode, ios->chip_select, ios->vdd,
394 ios->bus_width, ios->timing);
395
396 host->ops->set_ios(host, ios);
397 }
398
399 static int mmc_select_card(struct mmc_host *host, struct mmc_card *card)
400 {
401 int err;
402 struct mmc_command cmd;
403
404 BUG_ON(!host->claimed);
405
406 if (host->card_selected == card)
407 return MMC_ERR_NONE;
408
409 host->card_selected = card;
410
411 cmd.opcode = MMC_SELECT_CARD;
412 cmd.arg = card->rca << 16;
413 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
414
415 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
416 if (err != MMC_ERR_NONE)
417 return err;
418
419 /*
420 * We can only change the bus width of SD cards when
421 * they are selected so we have to put the handling
422 * here.
423 *
424 * The card is in 1 bit mode by default so
425 * we only need to change if it supports the
426 * wider version.
427 */
428 if (mmc_card_sd(card) &&
429 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
430
431 /*
432 * Default bus width is 1 bit.
433 */
434 host->ios.bus_width = MMC_BUS_WIDTH_1;
435
436 if (host->caps & MMC_CAP_4_BIT_DATA) {
437 struct mmc_command cmd;
438 cmd.opcode = SD_APP_SET_BUS_WIDTH;
439 cmd.arg = SD_BUS_WIDTH_4;
440 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
441
442 err = mmc_wait_for_app_cmd(host, card->rca, &cmd,
443 CMD_RETRIES);
444 if (err != MMC_ERR_NONE)
445 return err;
446
447 host->ios.bus_width = MMC_BUS_WIDTH_4;
448 }
449 }
450
451 mmc_set_ios(host);
452
453 return MMC_ERR_NONE;
454 }
455
456 /*
457 * Ensure that no card is selected.
458 */
459 static void mmc_deselect_cards(struct mmc_host *host)
460 {
461 struct mmc_command cmd;
462
463 if (host->card_selected) {
464 host->card_selected = NULL;
465
466 cmd.opcode = MMC_SELECT_CARD;
467 cmd.arg = 0;
468 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
469
470 mmc_wait_for_cmd(host, &cmd, 0);
471 }
472 }
473
474
475 static inline void mmc_delay(unsigned int ms)
476 {
477 if (ms < 1000 / HZ) {
478 cond_resched();
479 mdelay(ms);
480 } else {
481 msleep(ms);
482 }
483 }
484
485 /*
486 * Mask off any voltages we don't support and select
487 * the lowest voltage
488 */
489 static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
490 {
491 int bit;
492
493 ocr &= host->ocr_avail;
494
495 bit = ffs(ocr);
496 if (bit) {
497 bit -= 1;
498
499 ocr &= 3 << bit;
500
501 host->ios.vdd = bit;
502 mmc_set_ios(host);
503 } else {
504 ocr = 0;
505 }
506
507 return ocr;
508 }
509
510 #define UNSTUFF_BITS(resp,start,size) \
511 ({ \
512 const int __size = size; \
513 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
514 const int __off = 3 - ((start) / 32); \
515 const int __shft = (start) & 31; \
516 u32 __res; \
517 \
518 __res = resp[__off] >> __shft; \
519 if (__size + __shft > 32) \
520 __res |= resp[__off-1] << ((32 - __shft) % 32); \
521 __res & __mask; \
522 })
523
524 /*
525 * Given the decoded CSD structure, decode the raw CID to our CID structure.
526 */
527 static void mmc_decode_cid(struct mmc_card *card)
528 {
529 u32 *resp = card->raw_cid;
530
531 memset(&card->cid, 0, sizeof(struct mmc_cid));
532
533 if (mmc_card_sd(card)) {
534 /*
535 * SD doesn't currently have a version field so we will
536 * have to assume we can parse this.
537 */
538 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
539 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
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.hwrev = UNSTUFF_BITS(resp, 60, 4);
546 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
547 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
548 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
549 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
550
551 card->cid.year += 2000; /* SD cards year offset */
552 } else {
553 /*
554 * The selection of the format here is based upon published
555 * specs from sandisk and from what people have reported.
556 */
557 switch (card->csd.mmca_vsn) {
558 case 0: /* MMC v1.0 - v1.2 */
559 case 1: /* MMC v1.4 */
560 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
561 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
562 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
563 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
564 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
565 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
566 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
567 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
568 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
569 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
570 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
571 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
572 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
573 break;
574
575 case 2: /* MMC v2.0 - v2.2 */
576 case 3: /* MMC v3.1 - v3.3 */
577 case 4: /* MMC v4 */
578 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
579 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
580 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
581 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
582 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
583 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
584 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
585 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
586 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
587 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
588 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
589 break;
590
591 default:
592 printk("%s: card has unknown MMCA version %d\n",
593 mmc_hostname(card->host), card->csd.mmca_vsn);
594 mmc_card_set_bad(card);
595 break;
596 }
597 }
598 }
599
600 /*
601 * Given a 128-bit response, decode to our card CSD structure.
602 */
603 static void mmc_decode_csd(struct mmc_card *card)
604 {
605 struct mmc_csd *csd = &card->csd;
606 unsigned int e, m, csd_struct;
607 u32 *resp = card->raw_csd;
608
609 if (mmc_card_sd(card)) {
610 csd_struct = UNSTUFF_BITS(resp, 126, 2);
611
612 switch (csd_struct) {
613 case 0:
614 m = UNSTUFF_BITS(resp, 115, 4);
615 e = UNSTUFF_BITS(resp, 112, 3);
616 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
617 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
618
619 m = UNSTUFF_BITS(resp, 99, 4);
620 e = UNSTUFF_BITS(resp, 96, 3);
621 csd->max_dtr = tran_exp[e] * tran_mant[m];
622 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
623
624 e = UNSTUFF_BITS(resp, 47, 3);
625 m = UNSTUFF_BITS(resp, 62, 12);
626 csd->capacity = (1 + m) << (e + 2);
627
628 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
629 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
630 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
631 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
632 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
633 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
634 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
635 break;
636 case 1:
637 /*
638 * This is a block-addressed SDHC card. Most
639 * interesting fields are unused and have fixed
640 * values. To avoid getting tripped by buggy cards,
641 * we assume those fixed values ourselves.
642 */
643 mmc_card_set_blockaddr(card);
644
645 csd->tacc_ns = 0; /* Unused */
646 csd->tacc_clks = 0; /* Unused */
647
648 m = UNSTUFF_BITS(resp, 99, 4);
649 e = UNSTUFF_BITS(resp, 96, 3);
650 csd->max_dtr = tran_exp[e] * tran_mant[m];
651 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
652
653 m = UNSTUFF_BITS(resp, 48, 22);
654 csd->capacity = (1 + m) << 10;
655
656 csd->read_blkbits = 9;
657 csd->read_partial = 0;
658 csd->write_misalign = 0;
659 csd->read_misalign = 0;
660 csd->r2w_factor = 4; /* Unused */
661 csd->write_blkbits = 9;
662 csd->write_partial = 0;
663 break;
664 default:
665 printk("%s: unrecognised CSD structure version %d\n",
666 mmc_hostname(card->host), csd_struct);
667 mmc_card_set_bad(card);
668 return;
669 }
670 } else {
671 /*
672 * We only understand CSD structure v1.1 and v1.2.
673 * v1.2 has extra information in bits 15, 11 and 10.
674 */
675 csd_struct = UNSTUFF_BITS(resp, 126, 2);
676 if (csd_struct != 1 && csd_struct != 2) {
677 printk("%s: unrecognised CSD structure version %d\n",
678 mmc_hostname(card->host), csd_struct);
679 mmc_card_set_bad(card);
680 return;
681 }
682
683 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
684 m = UNSTUFF_BITS(resp, 115, 4);
685 e = UNSTUFF_BITS(resp, 112, 3);
686 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
687 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
688
689 m = UNSTUFF_BITS(resp, 99, 4);
690 e = UNSTUFF_BITS(resp, 96, 3);
691 csd->max_dtr = tran_exp[e] * tran_mant[m];
692 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
693
694 e = UNSTUFF_BITS(resp, 47, 3);
695 m = UNSTUFF_BITS(resp, 62, 12);
696 csd->capacity = (1 + m) << (e + 2);
697
698 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
699 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
700 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
701 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
702 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
703 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
704 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
705 }
706 }
707
708 /*
709 * Given a 64-bit response, decode to our card SCR structure.
710 */
711 static void mmc_decode_scr(struct mmc_card *card)
712 {
713 struct sd_scr *scr = &card->scr;
714 unsigned int scr_struct;
715 u32 resp[4];
716
717 BUG_ON(!mmc_card_sd(card));
718
719 resp[3] = card->raw_scr[1];
720 resp[2] = card->raw_scr[0];
721
722 scr_struct = UNSTUFF_BITS(resp, 60, 4);
723 if (scr_struct != 0) {
724 printk("%s: unrecognised SCR structure version %d\n",
725 mmc_hostname(card->host), scr_struct);
726 mmc_card_set_bad(card);
727 return;
728 }
729
730 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
731 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
732 }
733
734 /*
735 * Locate a MMC card on this MMC host given a raw CID.
736 */
737 static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid)
738 {
739 struct mmc_card *card;
740
741 list_for_each_entry(card, &host->cards, node) {
742 if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0)
743 return card;
744 }
745 return NULL;
746 }
747
748 /*
749 * Allocate a new MMC card, and assign a unique RCA.
750 */
751 static struct mmc_card *
752 mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca)
753 {
754 struct mmc_card *card, *c;
755 unsigned int rca = *frca;
756
757 card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL);
758 if (!card)
759 return ERR_PTR(-ENOMEM);
760
761 mmc_init_card(card, host);
762 memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid));
763
764 again:
765 list_for_each_entry(c, &host->cards, node)
766 if (c->rca == rca) {
767 rca++;
768 goto again;
769 }
770
771 card->rca = rca;
772
773 *frca = rca;
774
775 return card;
776 }
777
778 /*
779 * Tell attached cards to go to IDLE state
780 */
781 static void mmc_idle_cards(struct mmc_host *host)
782 {
783 struct mmc_command cmd;
784
785 host->ios.chip_select = MMC_CS_HIGH;
786 mmc_set_ios(host);
787
788 mmc_delay(1);
789
790 cmd.opcode = MMC_GO_IDLE_STATE;
791 cmd.arg = 0;
792 cmd.flags = MMC_RSP_NONE | MMC_CMD_BC;
793
794 mmc_wait_for_cmd(host, &cmd, 0);
795
796 mmc_delay(1);
797
798 host->ios.chip_select = MMC_CS_DONTCARE;
799 mmc_set_ios(host);
800
801 mmc_delay(1);
802 }
803
804 /*
805 * Apply power to the MMC stack. This is a two-stage process.
806 * First, we enable power to the card without the clock running.
807 * We then wait a bit for the power to stabilise. Finally,
808 * enable the bus drivers and clock to the card.
809 *
810 * We must _NOT_ enable the clock prior to power stablising.
811 *
812 * If a host does all the power sequencing itself, ignore the
813 * initial MMC_POWER_UP stage.
814 */
815 static void mmc_power_up(struct mmc_host *host)
816 {
817 int bit = fls(host->ocr_avail) - 1;
818
819 host->ios.vdd = bit;
820 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
821 host->ios.chip_select = MMC_CS_DONTCARE;
822 host->ios.power_mode = MMC_POWER_UP;
823 host->ios.bus_width = MMC_BUS_WIDTH_1;
824 host->ios.timing = MMC_TIMING_LEGACY;
825 mmc_set_ios(host);
826
827 mmc_delay(1);
828
829 host->ios.clock = host->f_min;
830 host->ios.power_mode = MMC_POWER_ON;
831 mmc_set_ios(host);
832
833 mmc_delay(2);
834 }
835
836 static void mmc_power_off(struct mmc_host *host)
837 {
838 host->ios.clock = 0;
839 host->ios.vdd = 0;
840 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
841 host->ios.chip_select = MMC_CS_DONTCARE;
842 host->ios.power_mode = MMC_POWER_OFF;
843 host->ios.bus_width = MMC_BUS_WIDTH_1;
844 host->ios.timing = MMC_TIMING_LEGACY;
845 mmc_set_ios(host);
846 }
847
848 static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
849 {
850 struct mmc_command cmd;
851 int i, err = 0;
852
853 cmd.opcode = MMC_SEND_OP_COND;
854 cmd.arg = ocr;
855 cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
856
857 for (i = 100; i; i--) {
858 err = mmc_wait_for_cmd(host, &cmd, 0);
859 if (err != MMC_ERR_NONE)
860 break;
861
862 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
863 break;
864
865 err = MMC_ERR_TIMEOUT;
866
867 mmc_delay(10);
868 }
869
870 if (rocr)
871 *rocr = cmd.resp[0];
872
873 return err;
874 }
875
876 static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
877 {
878 struct mmc_command cmd;
879 int i, err = 0;
880
881 cmd.opcode = SD_APP_OP_COND;
882 cmd.arg = ocr;
883 cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
884
885 for (i = 100; i; i--) {
886 err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES);
887 if (err != MMC_ERR_NONE)
888 break;
889
890 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
891 break;
892
893 err = MMC_ERR_TIMEOUT;
894
895 mmc_delay(10);
896 }
897
898 if (rocr)
899 *rocr = cmd.resp[0];
900
901 return err;
902 }
903
904 static int mmc_send_if_cond(struct mmc_host *host, u32 ocr, int *rsd2)
905 {
906 struct mmc_command cmd;
907 int err, sd2;
908 static const u8 test_pattern = 0xAA;
909
910 /*
911 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
912 * before SD_APP_OP_COND. This command will harmlessly fail for
913 * SD 1.0 cards.
914 */
915 cmd.opcode = SD_SEND_IF_COND;
916 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
917 cmd.flags = MMC_RSP_R7 | MMC_CMD_BCR;
918
919 err = mmc_wait_for_cmd(host, &cmd, 0);
920 if (err == MMC_ERR_NONE) {
921 if ((cmd.resp[0] & 0xFF) == test_pattern) {
922 sd2 = 1;
923 } else {
924 sd2 = 0;
925 err = MMC_ERR_FAILED;
926 }
927 } else {
928 /*
929 * Treat errors as SD 1.0 card.
930 */
931 sd2 = 0;
932 err = MMC_ERR_NONE;
933 }
934 if (rsd2)
935 *rsd2 = sd2;
936 return err;
937 }
938
939 /*
940 * Discover cards by requesting their CID. If this command
941 * times out, it is not an error; there are no further cards
942 * to be discovered. Add new cards to the list.
943 *
944 * Create a mmc_card entry for each discovered card, assigning
945 * it an RCA, and save the raw CID for decoding later.
946 */
947 static void mmc_discover_cards(struct mmc_host *host)
948 {
949 struct mmc_card *card;
950 unsigned int first_rca = 1, err;
951
952 while (1) {
953 struct mmc_command cmd;
954
955 cmd.opcode = MMC_ALL_SEND_CID;
956 cmd.arg = 0;
957 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
958
959 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
960 if (err == MMC_ERR_TIMEOUT) {
961 err = MMC_ERR_NONE;
962 break;
963 }
964 if (err != MMC_ERR_NONE) {
965 printk(KERN_ERR "%s: error requesting CID: %d\n",
966 mmc_hostname(host), err);
967 break;
968 }
969
970 card = mmc_find_card(host, cmd.resp);
971 if (!card) {
972 card = mmc_alloc_card(host, cmd.resp, &first_rca);
973 if (IS_ERR(card)) {
974 err = PTR_ERR(card);
975 break;
976 }
977 list_add(&card->node, &host->cards);
978 }
979
980 card->state &= ~MMC_STATE_DEAD;
981
982 if (host->mode == MMC_MODE_SD) {
983 mmc_card_set_sd(card);
984
985 cmd.opcode = SD_SEND_RELATIVE_ADDR;
986 cmd.arg = 0;
987 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
988
989 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
990 if (err != MMC_ERR_NONE)
991 mmc_card_set_dead(card);
992 else {
993 card->rca = cmd.resp[0] >> 16;
994
995 if (!host->ops->get_ro) {
996 printk(KERN_WARNING "%s: host does not "
997 "support reading read-only "
998 "switch. assuming write-enable.\n",
999 mmc_hostname(host));
1000 } else {
1001 if (host->ops->get_ro(host))
1002 mmc_card_set_readonly(card);
1003 }
1004 }
1005 } else {
1006 cmd.opcode = MMC_SET_RELATIVE_ADDR;
1007 cmd.arg = card->rca << 16;
1008 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1009
1010 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1011 if (err != MMC_ERR_NONE)
1012 mmc_card_set_dead(card);
1013 }
1014 }
1015 }
1016
1017 static void mmc_read_csds(struct mmc_host *host)
1018 {
1019 struct mmc_card *card;
1020
1021 list_for_each_entry(card, &host->cards, node) {
1022 struct mmc_command cmd;
1023 int err;
1024
1025 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
1026 continue;
1027
1028 cmd.opcode = MMC_SEND_CSD;
1029 cmd.arg = card->rca << 16;
1030 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
1031
1032 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1033 if (err != MMC_ERR_NONE) {
1034 mmc_card_set_dead(card);
1035 continue;
1036 }
1037
1038 memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd));
1039
1040 mmc_decode_csd(card);
1041 mmc_decode_cid(card);
1042 }
1043 }
1044
1045 static void mmc_process_ext_csds(struct mmc_host *host)
1046 {
1047 int err;
1048 struct mmc_card *card;
1049
1050 struct mmc_request mrq;
1051 struct mmc_command cmd;
1052 struct mmc_data data;
1053
1054 struct scatterlist sg;
1055
1056 /*
1057 * As the ext_csd is so large and mostly unused, we don't store the
1058 * raw block in mmc_card.
1059 */
1060 u8 *ext_csd;
1061 ext_csd = kmalloc(512, GFP_KERNEL);
1062 if (!ext_csd) {
1063 printk("%s: could not allocate a buffer to receive the ext_csd."
1064 "mmc v4 cards will be treated as v3.\n",
1065 mmc_hostname(host));
1066 return;
1067 }
1068
1069 list_for_each_entry(card, &host->cards, node) {
1070 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
1071 continue;
1072 if (mmc_card_sd(card))
1073 continue;
1074 if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
1075 continue;
1076
1077 err = mmc_select_card(host, card);
1078 if (err != MMC_ERR_NONE) {
1079 mmc_card_set_dead(card);
1080 continue;
1081 }
1082
1083 memset(&cmd, 0, sizeof(struct mmc_command));
1084
1085 cmd.opcode = MMC_SEND_EXT_CSD;
1086 cmd.arg = 0;
1087 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1088
1089 memset(&data, 0, sizeof(struct mmc_data));
1090
1091 mmc_set_data_timeout(&data, card, 0);
1092
1093 data.blksz = 512;
1094 data.blocks = 1;
1095 data.flags = MMC_DATA_READ;
1096 data.sg = &sg;
1097 data.sg_len = 1;
1098
1099 memset(&mrq, 0, sizeof(struct mmc_request));
1100
1101 mrq.cmd = &cmd;
1102 mrq.data = &data;
1103
1104 sg_init_one(&sg, ext_csd, 512);
1105
1106 mmc_wait_for_req(host, &mrq);
1107
1108 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
1109 printk("%s: unable to read EXT_CSD, performance "
1110 "might suffer.\n", mmc_hostname(card->host));
1111 continue;
1112 }
1113
1114 switch (ext_csd[EXT_CSD_CARD_TYPE]) {
1115 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
1116 card->ext_csd.hs_max_dtr = 52000000;
1117 break;
1118 case EXT_CSD_CARD_TYPE_26:
1119 card->ext_csd.hs_max_dtr = 26000000;
1120 break;
1121 default:
1122 /* MMC v4 spec says this cannot happen */
1123 printk("%s: card is mmc v4 but doesn't support "
1124 "any high-speed modes.\n",
1125 mmc_hostname(card->host));
1126 continue;
1127 }
1128
1129 if (host->caps & MMC_CAP_MMC_HIGHSPEED) {
1130 /* Activate highspeed support. */
1131 cmd.opcode = MMC_SWITCH;
1132 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
1133 (EXT_CSD_HS_TIMING << 16) |
1134 (1 << 8) |
1135 EXT_CSD_CMD_SET_NORMAL;
1136 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1137
1138 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1139 if (err != MMC_ERR_NONE) {
1140 printk("%s: failed to switch card to mmc v4 "
1141 "high-speed mode.\n",
1142 mmc_hostname(card->host));
1143 continue;
1144 }
1145
1146 mmc_card_set_highspeed(card);
1147
1148 host->ios.timing = MMC_TIMING_SD_HS;
1149 mmc_set_ios(host);
1150 }
1151
1152 /* Check for host support for wide-bus modes. */
1153 if (host->caps & MMC_CAP_4_BIT_DATA) {
1154 /* Activate 4-bit support. */
1155 cmd.opcode = MMC_SWITCH;
1156 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
1157 (EXT_CSD_BUS_WIDTH << 16) |
1158 (EXT_CSD_BUS_WIDTH_4 << 8) |
1159 EXT_CSD_CMD_SET_NORMAL;
1160 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1161
1162 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1163 if (err != MMC_ERR_NONE) {
1164 printk("%s: failed to switch card to "
1165 "mmc v4 4-bit bus mode.\n",
1166 mmc_hostname(card->host));
1167 continue;
1168 }
1169
1170 host->ios.bus_width = MMC_BUS_WIDTH_4;
1171 mmc_set_ios(host);
1172 }
1173 }
1174
1175 kfree(ext_csd);
1176
1177 mmc_deselect_cards(host);
1178 }
1179
1180 static void mmc_read_scrs(struct mmc_host *host)
1181 {
1182 int err;
1183 struct mmc_card *card;
1184 struct mmc_request mrq;
1185 struct mmc_command cmd;
1186 struct mmc_data data;
1187 struct scatterlist sg;
1188
1189 list_for_each_entry(card, &host->cards, node) {
1190 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
1191 continue;
1192 if (!mmc_card_sd(card))
1193 continue;
1194
1195 err = mmc_select_card(host, card);
1196 if (err != MMC_ERR_NONE) {
1197 mmc_card_set_dead(card);
1198 continue;
1199 }
1200
1201 memset(&cmd, 0, sizeof(struct mmc_command));
1202
1203 cmd.opcode = MMC_APP_CMD;
1204 cmd.arg = card->rca << 16;
1205 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1206
1207 err = mmc_wait_for_cmd(host, &cmd, 0);
1208 if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) {
1209 mmc_card_set_dead(card);
1210 continue;
1211 }
1212
1213 memset(&cmd, 0, sizeof(struct mmc_command));
1214
1215 cmd.opcode = SD_APP_SEND_SCR;
1216 cmd.arg = 0;
1217 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1218
1219 memset(&data, 0, sizeof(struct mmc_data));
1220
1221 mmc_set_data_timeout(&data, card, 0);
1222
1223 data.blksz = 1 << 3;
1224 data.blocks = 1;
1225 data.flags = MMC_DATA_READ;
1226 data.sg = &sg;
1227 data.sg_len = 1;
1228
1229 memset(&mrq, 0, sizeof(struct mmc_request));
1230
1231 mrq.cmd = &cmd;
1232 mrq.data = &data;
1233
1234 sg_init_one(&sg, (u8*)card->raw_scr, 8);
1235
1236 mmc_wait_for_req(host, &mrq);
1237
1238 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
1239 mmc_card_set_dead(card);
1240 continue;
1241 }
1242
1243 card->raw_scr[0] = ntohl(card->raw_scr[0]);
1244 card->raw_scr[1] = ntohl(card->raw_scr[1]);
1245
1246 mmc_decode_scr(card);
1247 }
1248
1249 mmc_deselect_cards(host);
1250 }
1251
1252 static void mmc_read_switch_caps(struct mmc_host *host)
1253 {
1254 int err;
1255 struct mmc_card *card;
1256 struct mmc_request mrq;
1257 struct mmc_command cmd;
1258 struct mmc_data data;
1259 unsigned char *status;
1260 struct scatterlist sg;
1261
1262 if (!(host->caps & MMC_CAP_SD_HIGHSPEED))
1263 return;
1264
1265 status = kmalloc(64, GFP_KERNEL);
1266 if (!status) {
1267 printk(KERN_WARNING "%s: Unable to allocate buffer for "
1268 "reading switch capabilities.\n",
1269 mmc_hostname(host));
1270 return;
1271 }
1272
1273 list_for_each_entry(card, &host->cards, node) {
1274 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
1275 continue;
1276 if (!mmc_card_sd(card))
1277 continue;
1278 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
1279 continue;
1280
1281 err = mmc_select_card(host, card);
1282 if (err != MMC_ERR_NONE) {
1283 mmc_card_set_dead(card);
1284 continue;
1285 }
1286
1287 memset(&cmd, 0, sizeof(struct mmc_command));
1288
1289 cmd.opcode = SD_SWITCH;
1290 cmd.arg = 0x00FFFFF1;
1291 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1292
1293 memset(&data, 0, sizeof(struct mmc_data));
1294
1295 mmc_set_data_timeout(&data, card, 0);
1296
1297 data.blksz = 64;
1298 data.blocks = 1;
1299 data.flags = MMC_DATA_READ;
1300 data.sg = &sg;
1301 data.sg_len = 1;
1302
1303 memset(&mrq, 0, sizeof(struct mmc_request));
1304
1305 mrq.cmd = &cmd;
1306 mrq.data = &data;
1307
1308 sg_init_one(&sg, status, 64);
1309
1310 mmc_wait_for_req(host, &mrq);
1311
1312 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
1313 printk("%s: unable to read switch capabilities, "
1314 "performance might suffer.\n",
1315 mmc_hostname(card->host));
1316 continue;
1317 }
1318
1319 if (status[13] & 0x02)
1320 card->sw_caps.hs_max_dtr = 50000000;
1321
1322 memset(&cmd, 0, sizeof(struct mmc_command));
1323
1324 cmd.opcode = SD_SWITCH;
1325 cmd.arg = 0x80FFFFF1;
1326 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1327
1328 memset(&data, 0, sizeof(struct mmc_data));
1329
1330 mmc_set_data_timeout(&data, card, 0);
1331
1332 data.blksz = 64;
1333 data.blocks = 1;
1334 data.flags = MMC_DATA_READ;
1335 data.sg = &sg;
1336 data.sg_len = 1;
1337
1338 memset(&mrq, 0, sizeof(struct mmc_request));
1339
1340 mrq.cmd = &cmd;
1341 mrq.data = &data;
1342
1343 sg_init_one(&sg, status, 64);
1344
1345 mmc_wait_for_req(host, &mrq);
1346
1347 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE ||
1348 (status[16] & 0xF) != 1) {
1349 printk(KERN_WARNING "%s: Problem switching card "
1350 "into high-speed mode!\n",
1351 mmc_hostname(host));
1352 continue;
1353 }
1354
1355 mmc_card_set_highspeed(card);
1356
1357 host->ios.timing = MMC_TIMING_SD_HS;
1358 mmc_set_ios(host);
1359 }
1360
1361 kfree(status);
1362
1363 mmc_deselect_cards(host);
1364 }
1365
1366 static unsigned int mmc_calculate_clock(struct mmc_host *host)
1367 {
1368 struct mmc_card *card;
1369 unsigned int max_dtr = host->f_max;
1370
1371 list_for_each_entry(card, &host->cards, node)
1372 if (!mmc_card_dead(card)) {
1373 if (mmc_card_highspeed(card) && mmc_card_sd(card)) {
1374 if (max_dtr > card->sw_caps.hs_max_dtr)
1375 max_dtr = card->sw_caps.hs_max_dtr;
1376 } else if (mmc_card_highspeed(card) && !mmc_card_sd(card)) {
1377 if (max_dtr > card->ext_csd.hs_max_dtr)
1378 max_dtr = card->ext_csd.hs_max_dtr;
1379 } else if (max_dtr > card->csd.max_dtr) {
1380 max_dtr = card->csd.max_dtr;
1381 }
1382 }
1383
1384 pr_debug("%s: selected %d.%03dMHz transfer rate\n",
1385 mmc_hostname(host),
1386 max_dtr / 1000000, (max_dtr / 1000) % 1000);
1387
1388 return max_dtr;
1389 }
1390
1391 /*
1392 * Check whether cards we already know about are still present.
1393 * We do this by requesting status, and checking whether a card
1394 * responds.
1395 *
1396 * A request for status does not cause a state change in data
1397 * transfer mode.
1398 */
1399 static void mmc_check_cards(struct mmc_host *host)
1400 {
1401 struct list_head *l, *n;
1402
1403 mmc_deselect_cards(host);
1404
1405 list_for_each_safe(l, n, &host->cards) {
1406 struct mmc_card *card = mmc_list_to_card(l);
1407 struct mmc_command cmd;
1408 int err;
1409
1410 cmd.opcode = MMC_SEND_STATUS;
1411 cmd.arg = card->rca << 16;
1412 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1413
1414 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1415 if (err == MMC_ERR_NONE)
1416 continue;
1417
1418 mmc_card_set_dead(card);
1419 }
1420 }
1421
1422 static void mmc_setup(struct mmc_host *host)
1423 {
1424 if (host->ios.power_mode != MMC_POWER_ON) {
1425 int err;
1426 u32 ocr;
1427
1428 host->mode = MMC_MODE_SD;
1429
1430 mmc_power_up(host);
1431 mmc_idle_cards(host);
1432
1433 err = mmc_send_if_cond(host, host->ocr_avail, NULL);
1434 if (err != MMC_ERR_NONE) {
1435 return;
1436 }
1437 err = mmc_send_app_op_cond(host, 0, &ocr);
1438
1439 /*
1440 * If we fail to detect any SD cards then try
1441 * searching for MMC cards.
1442 */
1443 if (err != MMC_ERR_NONE) {
1444 host->mode = MMC_MODE_MMC;
1445
1446 err = mmc_send_op_cond(host, 0, &ocr);
1447 if (err != MMC_ERR_NONE)
1448 return;
1449 }
1450
1451 host->ocr = mmc_select_voltage(host, ocr);
1452
1453 /*
1454 * Since we're changing the OCR value, we seem to
1455 * need to tell some cards to go back to the idle
1456 * state. We wait 1ms to give cards time to
1457 * respond.
1458 */
1459 if (host->ocr)
1460 mmc_idle_cards(host);
1461 } else {
1462 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1463 host->ios.clock = host->f_min;
1464 mmc_set_ios(host);
1465
1466 /*
1467 * We should remember the OCR mask from the existing
1468 * cards, and detect the new cards OCR mask, combine
1469 * the two and re-select the VDD. However, if we do
1470 * change VDD, we should do an idle, and then do a
1471 * full re-initialisation. We would need to notify
1472 * drivers so that they can re-setup the cards as
1473 * well, while keeping their queues at bay.
1474 *
1475 * For the moment, we take the easy way out - if the
1476 * new cards don't like our currently selected VDD,
1477 * they drop off the bus.
1478 */
1479 }
1480
1481 if (host->ocr == 0)
1482 return;
1483
1484 /*
1485 * Send the selected OCR multiple times... until the cards
1486 * all get the idea that they should be ready for CMD2.
1487 * (My SanDisk card seems to need this.)
1488 */
1489 if (host->mode == MMC_MODE_SD) {
1490 int err, sd2;
1491 err = mmc_send_if_cond(host, host->ocr, &sd2);
1492 if (err == MMC_ERR_NONE) {
1493 /*
1494 * If SD_SEND_IF_COND indicates an SD 2.0
1495 * compliant card and we should set bit 30
1496 * of the ocr to indicate that we can handle
1497 * block-addressed SDHC cards.
1498 */
1499 mmc_send_app_op_cond(host, host->ocr | (sd2 << 30), NULL);
1500 }
1501 } else {
1502 mmc_send_op_cond(host, host->ocr, NULL);
1503 }
1504
1505 mmc_discover_cards(host);
1506
1507 /*
1508 * Ok, now switch to push-pull mode.
1509 */
1510 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1511 mmc_set_ios(host);
1512
1513 mmc_read_csds(host);
1514
1515 if (host->mode == MMC_MODE_SD) {
1516 mmc_read_scrs(host);
1517 mmc_read_switch_caps(host);
1518 } else
1519 mmc_process_ext_csds(host);
1520 }
1521
1522
1523 /**
1524 * mmc_detect_change - process change of state on a MMC socket
1525 * @host: host which changed state.
1526 * @delay: optional delay to wait before detection (jiffies)
1527 *
1528 * All we know is that card(s) have been inserted or removed
1529 * from the socket(s). We don't know which socket or cards.
1530 */
1531 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1532 {
1533 mmc_schedule_delayed_work(&host->detect, delay);
1534 }
1535
1536 EXPORT_SYMBOL(mmc_detect_change);
1537
1538
1539 static void mmc_rescan(struct work_struct *work)
1540 {
1541 struct mmc_host *host =
1542 container_of(work, struct mmc_host, detect.work);
1543 struct list_head *l, *n;
1544 unsigned char power_mode;
1545
1546 mmc_claim_host(host);
1547
1548 /*
1549 * Check for removed cards and newly inserted ones. We check for
1550 * removed cards first so we can intelligently re-select the VDD.
1551 */
1552 power_mode = host->ios.power_mode;
1553 if (power_mode == MMC_POWER_ON)
1554 mmc_check_cards(host);
1555
1556 mmc_setup(host);
1557
1558 /*
1559 * Some broken cards process CMD1 even in stand-by state. There is
1560 * no reply, but an ILLEGAL_COMMAND error is cached and returned
1561 * after next command. We poll for card status here to clear any
1562 * possibly pending error.
1563 */
1564 if (power_mode == MMC_POWER_ON)
1565 mmc_check_cards(host);
1566
1567 if (!list_empty(&host->cards)) {
1568 /*
1569 * (Re-)calculate the fastest clock rate which the
1570 * attached cards and the host support.
1571 */
1572 host->ios.clock = mmc_calculate_clock(host);
1573 mmc_set_ios(host);
1574 }
1575
1576 mmc_release_host(host);
1577
1578 list_for_each_safe(l, n, &host->cards) {
1579 struct mmc_card *card = mmc_list_to_card(l);
1580
1581 /*
1582 * If this is a new and good card, register it.
1583 */
1584 if (!mmc_card_present(card) && !mmc_card_dead(card)) {
1585 if (mmc_register_card(card))
1586 mmc_card_set_dead(card);
1587 else
1588 mmc_card_set_present(card);
1589 }
1590
1591 /*
1592 * If this card is dead, destroy it.
1593 */
1594 if (mmc_card_dead(card)) {
1595 list_del(&card->node);
1596 mmc_remove_card(card);
1597 }
1598 }
1599
1600 /*
1601 * If we discover that there are no cards on the
1602 * bus, turn off the clock and power down.
1603 */
1604 if (list_empty(&host->cards))
1605 mmc_power_off(host);
1606 }
1607
1608
1609 /**
1610 * mmc_alloc_host - initialise the per-host structure.
1611 * @extra: sizeof private data structure
1612 * @dev: pointer to host device model structure
1613 *
1614 * Initialise the per-host structure.
1615 */
1616 struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
1617 {
1618 struct mmc_host *host;
1619
1620 host = mmc_alloc_host_sysfs(extra, dev);
1621 if (host) {
1622 spin_lock_init(&host->lock);
1623 init_waitqueue_head(&host->wq);
1624 INIT_LIST_HEAD(&host->cards);
1625 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
1626
1627 /*
1628 * By default, hosts do not support SGIO or large requests.
1629 * They have to set these according to their abilities.
1630 */
1631 host->max_hw_segs = 1;
1632 host->max_phys_segs = 1;
1633 host->max_seg_size = PAGE_CACHE_SIZE;
1634
1635 host->max_req_size = PAGE_CACHE_SIZE;
1636 host->max_blk_size = 512;
1637 host->max_blk_count = PAGE_CACHE_SIZE / 512;
1638 }
1639
1640 return host;
1641 }
1642
1643 EXPORT_SYMBOL(mmc_alloc_host);
1644
1645 /**
1646 * mmc_add_host - initialise host hardware
1647 * @host: mmc host
1648 */
1649 int mmc_add_host(struct mmc_host *host)
1650 {
1651 int ret;
1652
1653 ret = mmc_add_host_sysfs(host);
1654 if (ret == 0) {
1655 mmc_power_off(host);
1656 mmc_detect_change(host, 0);
1657 }
1658
1659 return ret;
1660 }
1661
1662 EXPORT_SYMBOL(mmc_add_host);
1663
1664 /**
1665 * mmc_remove_host - remove host hardware
1666 * @host: mmc host
1667 *
1668 * Unregister and remove all cards associated with this host,
1669 * and power down the MMC bus.
1670 */
1671 void mmc_remove_host(struct mmc_host *host)
1672 {
1673 struct list_head *l, *n;
1674
1675 list_for_each_safe(l, n, &host->cards) {
1676 struct mmc_card *card = mmc_list_to_card(l);
1677
1678 mmc_remove_card(card);
1679 }
1680
1681 mmc_power_off(host);
1682 mmc_remove_host_sysfs(host);
1683 }
1684
1685 EXPORT_SYMBOL(mmc_remove_host);
1686
1687 /**
1688 * mmc_free_host - free the host structure
1689 * @host: mmc host
1690 *
1691 * Free the host once all references to it have been dropped.
1692 */
1693 void mmc_free_host(struct mmc_host *host)
1694 {
1695 mmc_flush_scheduled_work();
1696 mmc_free_host_sysfs(host);
1697 }
1698
1699 EXPORT_SYMBOL(mmc_free_host);
1700
1701 #ifdef CONFIG_PM
1702
1703 /**
1704 * mmc_suspend_host - suspend a host
1705 * @host: mmc host
1706 * @state: suspend mode (PM_SUSPEND_xxx)
1707 */
1708 int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
1709 {
1710 mmc_claim_host(host);
1711 mmc_deselect_cards(host);
1712 mmc_power_off(host);
1713 mmc_release_host(host);
1714
1715 return 0;
1716 }
1717
1718 EXPORT_SYMBOL(mmc_suspend_host);
1719
1720 /**
1721 * mmc_resume_host - resume a previously suspended host
1722 * @host: mmc host
1723 */
1724 int mmc_resume_host(struct mmc_host *host)
1725 {
1726 mmc_rescan(&host->detect.work);
1727
1728 return 0;
1729 }
1730
1731 EXPORT_SYMBOL(mmc_resume_host);
1732
1733 #endif
1734
1735 MODULE_LICENSE("GPL");
Support for the Chinese Samsung S3C2440 based development boards