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kbuild: document howto build external modules using several directories
[linux-2.6/verdex.git] / drivers / mmc / mmc.c
blobeb41391e06e938a5a0607b90defab00f82fd9827
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 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12 #include <linux/config.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/completion.h>
17 #include <linux/device.h>
18 #include <linux/delay.h>
19 #include <linux/pagemap.h>
20 #include <linux/err.h>
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 #ifdef CONFIG_MMC_DEBUG
31 #define DBG(x...) printk(KERN_DEBUG x)
32 #else
33 #define DBG(x...) do { } while (0)
34 #endif
35
36 #define CMD_RETRIES 3
37
38 /*
39 * OCR Bit positions to 10s of Vdd mV.
40 */
41 static const unsigned short mmc_ocr_bit_to_vdd[] = {
42 150, 155, 160, 165, 170, 180, 190, 200,
43 210, 220, 230, 240, 250, 260, 270, 280,
44 290, 300, 310, 320, 330, 340, 350, 360
45 };
46
47 static const unsigned int tran_exp[] = {
48 10000, 100000, 1000000, 10000000,
49 0, 0, 0, 0
50 };
51
52 static const unsigned char tran_mant[] = {
53 0, 10, 12, 13, 15, 20, 25, 30,
54 35, 40, 45, 50, 55, 60, 70, 80,
55 };
56
57 static const unsigned int tacc_exp[] = {
58 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
59 };
60
61 static const unsigned int tacc_mant[] = {
62 0, 10, 12, 13, 15, 20, 25, 30,
63 35, 40, 45, 50, 55, 60, 70, 80,
64 };
65
66
67 /**
68 * mmc_request_done - finish processing an MMC command
69 * @host: MMC host which completed command
70 * @mrq: MMC request which completed
71 *
72 * MMC drivers should call this function when they have completed
73 * their processing of a command. This should be called before the
74 * data part of the command has completed.
75 */
76 void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
77 {
78 struct mmc_command *cmd = mrq->cmd;
79 int err = mrq->cmd->error;
80 DBG("MMC: req done (%02x): %d: %08x %08x %08x %08x\n", cmd->opcode,
81 err, cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]);
82
83 if (err && cmd->retries) {
84 cmd->retries--;
85 cmd->error = 0;
86 host->ops->request(host, mrq);
87 } else if (mrq->done) {
88 mrq->done(mrq);
89 }
90 }
91
92 EXPORT_SYMBOL(mmc_request_done);
93
94 /**
95 * mmc_start_request - start a command on a host
96 * @host: MMC host to start command on
97 * @mrq: MMC request to start
98 *
99 * Queue a command on the specified host. We expect the
100 * caller to be holding the host lock with interrupts disabled.
101 */
102 void
103 mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
104 {
105 DBG("MMC: starting cmd %02x arg %08x flags %08x\n",
106 mrq->cmd->opcode, mrq->cmd->arg, mrq->cmd->flags);
107
108 WARN_ON(host->card_busy == NULL);
109
110 mrq->cmd->error = 0;
111 mrq->cmd->mrq = mrq;
112 if (mrq->data) {
113 mrq->cmd->data = mrq->data;
114 mrq->data->error = 0;
115 mrq->data->mrq = mrq;
116 if (mrq->stop) {
117 mrq->data->stop = mrq->stop;
118 mrq->stop->error = 0;
119 mrq->stop->mrq = mrq;
120 }
121 }
122 host->ops->request(host, mrq);
123 }
124
125 EXPORT_SYMBOL(mmc_start_request);
126
127 static void mmc_wait_done(struct mmc_request *mrq)
128 {
129 complete(mrq->done_data);
130 }
131
132 int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
133 {
134 DECLARE_COMPLETION(complete);
135
136 mrq->done_data = &complete;
137 mrq->done = mmc_wait_done;
138
139 mmc_start_request(host, mrq);
140
141 wait_for_completion(&complete);
142
143 return 0;
144 }
145
146 EXPORT_SYMBOL(mmc_wait_for_req);
147
148 /**
149 * mmc_wait_for_cmd - start a command and wait for completion
150 * @host: MMC host to start command
151 * @cmd: MMC command to start
152 * @retries: maximum number of retries
153 *
154 * Start a new MMC command for a host, and wait for the command
155 * to complete. Return any error that occurred while the command
156 * was executing. Do not attempt to parse the response.
157 */
158 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
159 {
160 struct mmc_request mrq;
161
162 BUG_ON(host->card_busy == NULL);
163
164 memset(&mrq, 0, sizeof(struct mmc_request));
165
166 memset(cmd->resp, 0, sizeof(cmd->resp));
167 cmd->retries = retries;
168
169 mrq.cmd = cmd;
170 cmd->data = NULL;
171
172 mmc_wait_for_req(host, &mrq);
173
174 return cmd->error;
175 }
176
177 EXPORT_SYMBOL(mmc_wait_for_cmd);
178
179 /**
180 * mmc_wait_for_app_cmd - start an application command and wait for
181 completion
182 * @host: MMC host to start command
183 * @rca: RCA to send MMC_APP_CMD to
184 * @cmd: MMC command to start
185 * @retries: maximum number of retries
186 *
187 * Sends a MMC_APP_CMD, checks the card response, sends the command
188 * in the parameter and waits for it to complete. Return any error
189 * that occurred while the command was executing. Do not attempt to
190 * parse the response.
191 */
192 int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca,
193 struct mmc_command *cmd, int retries)
194 {
195 struct mmc_request mrq;
196 struct mmc_command appcmd;
197
198 int i, err;
199
200 BUG_ON(host->card_busy == NULL);
201 BUG_ON(retries < 0);
202
203 err = MMC_ERR_INVALID;
204
205 /*
206 * We have to resend MMC_APP_CMD for each attempt so
207 * we cannot use the retries field in mmc_command.
208 */
209 for (i = 0;i <= retries;i++) {
210 memset(&mrq, 0, sizeof(struct mmc_request));
211
212 appcmd.opcode = MMC_APP_CMD;
213 appcmd.arg = rca << 16;
214 appcmd.flags = MMC_RSP_R1;
215 appcmd.retries = 0;
216 memset(appcmd.resp, 0, sizeof(appcmd.resp));
217 appcmd.data = NULL;
218
219 mrq.cmd = &appcmd;
220 appcmd.data = NULL;
221
222 mmc_wait_for_req(host, &mrq);
223
224 if (appcmd.error) {
225 err = appcmd.error;
226 continue;
227 }
228
229 /* Check that card supported application commands */
230 if (!(appcmd.resp[0] & R1_APP_CMD))
231 return MMC_ERR_FAILED;
232
233 memset(&mrq, 0, sizeof(struct mmc_request));
234
235 memset(cmd->resp, 0, sizeof(cmd->resp));
236 cmd->retries = 0;
237
238 mrq.cmd = cmd;
239 cmd->data = NULL;
240
241 mmc_wait_for_req(host, &mrq);
242
243 err = cmd->error;
244 if (cmd->error == MMC_ERR_NONE)
245 break;
246 }
247
248 return err;
249 }
250
251 EXPORT_SYMBOL(mmc_wait_for_app_cmd);
252
253 static int mmc_select_card(struct mmc_host *host, struct mmc_card *card);
254
255 /**
256 * __mmc_claim_host - exclusively claim a host
257 * @host: mmc host to claim
258 * @card: mmc card to claim host for
259 *
260 * Claim a host for a set of operations. If a valid card
261 * is passed and this wasn't the last card selected, select
262 * the card before returning.
263 *
264 * Note: you should use mmc_card_claim_host or mmc_claim_host.
265 */
266 int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card)
267 {
268 DECLARE_WAITQUEUE(wait, current);
269 unsigned long flags;
270 int err = 0;
271
272 add_wait_queue(&host->wq, &wait);
273 spin_lock_irqsave(&host->lock, flags);
274 while (1) {
275 set_current_state(TASK_UNINTERRUPTIBLE);
276 if (host->card_busy == NULL)
277 break;
278 spin_unlock_irqrestore(&host->lock, flags);
279 schedule();
280 spin_lock_irqsave(&host->lock, flags);
281 }
282 set_current_state(TASK_RUNNING);
283 host->card_busy = card;
284 spin_unlock_irqrestore(&host->lock, flags);
285 remove_wait_queue(&host->wq, &wait);
286
287 if (card != (void *)-1) {
288 err = mmc_select_card(host, card);
289 if (err != MMC_ERR_NONE)
290 return err;
291 }
292
293 return err;
294 }
295
296 EXPORT_SYMBOL(__mmc_claim_host);
297
298 /**
299 * mmc_release_host - release a host
300 * @host: mmc host to release
301 *
302 * Release a MMC host, allowing others to claim the host
303 * for their operations.
304 */
305 void mmc_release_host(struct mmc_host *host)
306 {
307 unsigned long flags;
308
309 BUG_ON(host->card_busy == NULL);
310
311 spin_lock_irqsave(&host->lock, flags);
312 host->card_busy = NULL;
313 spin_unlock_irqrestore(&host->lock, flags);
314
315 wake_up(&host->wq);
316 }
317
318 EXPORT_SYMBOL(mmc_release_host);
319
320 static int mmc_select_card(struct mmc_host *host, struct mmc_card *card)
321 {
322 int err;
323 struct mmc_command cmd;
324
325 BUG_ON(host->card_busy == NULL);
326
327 if (host->card_selected == card)
328 return MMC_ERR_NONE;
329
330 host->card_selected = card;
331
332 cmd.opcode = MMC_SELECT_CARD;
333 cmd.arg = card->rca << 16;
334 cmd.flags = MMC_RSP_R1;
335
336 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
337 if (err != MMC_ERR_NONE)
338 return err;
339
340 /*
341 * Default bus width is 1 bit.
342 */
343 host->ios.bus_width = MMC_BUS_WIDTH_1;
344
345 /*
346 * We can only change the bus width of the selected
347 * card so therefore we have to put the handling
348 * here.
349 */
350 if (host->caps & MMC_CAP_4_BIT_DATA) {
351 /*
352 * The card is in 1 bit mode by default so
353 * we only need to change if it supports the
354 * wider version.
355 */
356 if (mmc_card_sd(card) &&
357 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
358 struct mmc_command cmd;
359 cmd.opcode = SD_APP_SET_BUS_WIDTH;
360 cmd.arg = SD_BUS_WIDTH_4;
361 cmd.flags = MMC_RSP_R1;
362
363 err = mmc_wait_for_app_cmd(host, card->rca, &cmd,
364 CMD_RETRIES);
365 if (err != MMC_ERR_NONE)
366 return err;
367
368 host->ios.bus_width = MMC_BUS_WIDTH_4;
369 }
370 }
371
372 host->ops->set_ios(host, &host->ios);
373
374 return MMC_ERR_NONE;
375 }
376
377 /*
378 * Ensure that no card is selected.
379 */
380 static void mmc_deselect_cards(struct mmc_host *host)
381 {
382 struct mmc_command cmd;
383
384 if (host->card_selected) {
385 host->card_selected = NULL;
386
387 cmd.opcode = MMC_SELECT_CARD;
388 cmd.arg = 0;
389 cmd.flags = MMC_RSP_NONE;
390
391 mmc_wait_for_cmd(host, &cmd, 0);
392 }
393 }
394
395
396 static inline void mmc_delay(unsigned int ms)
397 {
398 if (ms < HZ / 1000) {
399 yield();
400 mdelay(ms);
401 } else {
402 msleep_interruptible (ms);
403 }
404 }
405
406 /*
407 * Mask off any voltages we don't support and select
408 * the lowest voltage
409 */
410 static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
411 {
412 int bit;
413
414 ocr &= host->ocr_avail;
415
416 bit = ffs(ocr);
417 if (bit) {
418 bit -= 1;
419
420 ocr = 3 << bit;
421
422 host->ios.vdd = bit;
423 host->ops->set_ios(host, &host->ios);
424 } else {
425 ocr = 0;
426 }
427
428 return ocr;
429 }
430
431 #define UNSTUFF_BITS(resp,start,size) \
432 ({ \
433 const int __size = size; \
434 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
435 const int __off = 3 - ((start) / 32); \
436 const int __shft = (start) & 31; \
437 u32 __res; \
438 \
439 __res = resp[__off] >> __shft; \
440 if (__size + __shft > 32) \
441 __res |= resp[__off-1] << ((32 - __shft) % 32); \
442 __res & __mask; \
443 })
444
445 /*
446 * Given the decoded CSD structure, decode the raw CID to our CID structure.
447 */
448 static void mmc_decode_cid(struct mmc_card *card)
449 {
450 u32 *resp = card->raw_cid;
451
452 memset(&card->cid, 0, sizeof(struct mmc_cid));
453
454 if (mmc_card_sd(card)) {
455 /*
456 * SD doesn't currently have a version field so we will
457 * have to assume we can parse this.
458 */
459 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
460 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
461 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
462 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
463 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
464 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
465 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
466 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
467 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
468 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
469 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
470 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
471
472 card->cid.year += 2000; /* SD cards year offset */
473 } else {
474 /*
475 * The selection of the format here is based upon published
476 * specs from sandisk and from what people have reported.
477 */
478 switch (card->csd.mmca_vsn) {
479 case 0: /* MMC v1.0 - v1.2 */
480 case 1: /* MMC v1.4 */
481 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
482 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
483 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
484 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
485 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
486 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
487 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
488 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
489 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
490 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
491 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
492 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
493 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
494 break;
495
496 case 2: /* MMC v2.0 - v2.2 */
497 case 3: /* MMC v3.1 - v3.3 */
498 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
499 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
500 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
501 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
502 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
503 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
504 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
505 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
506 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
507 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
508 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
509 break;
510
511 default:
512 printk("%s: card has unknown MMCA version %d\n",
513 mmc_hostname(card->host), card->csd.mmca_vsn);
514 mmc_card_set_bad(card);
515 break;
516 }
517 }
518 }
519
520 /*
521 * Given a 128-bit response, decode to our card CSD structure.
522 */
523 static void mmc_decode_csd(struct mmc_card *card)
524 {
525 struct mmc_csd *csd = &card->csd;
526 unsigned int e, m, csd_struct;
527 u32 *resp = card->raw_csd;
528
529 if (mmc_card_sd(card)) {
530 csd_struct = UNSTUFF_BITS(resp, 126, 2);
531 if (csd_struct != 0) {
532 printk("%s: unrecognised CSD structure version %d\n",
533 mmc_hostname(card->host), csd_struct);
534 mmc_card_set_bad(card);
535 return;
536 }
537
538 m = UNSTUFF_BITS(resp, 115, 4);
539 e = UNSTUFF_BITS(resp, 112, 3);
540 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
541 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
542
543 m = UNSTUFF_BITS(resp, 99, 4);
544 e = UNSTUFF_BITS(resp, 96, 3);
545 csd->max_dtr = tran_exp[e] * tran_mant[m];
546 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
547
548 e = UNSTUFF_BITS(resp, 47, 3);
549 m = UNSTUFF_BITS(resp, 62, 12);
550 csd->capacity = (1 + m) << (e + 2);
551
552 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
553 } else {
554 /*
555 * We only understand CSD structure v1.1 and v1.2.
556 * v1.2 has extra information in bits 15, 11 and 10.
557 */
558 csd_struct = UNSTUFF_BITS(resp, 126, 2);
559 if (csd_struct != 1 && csd_struct != 2) {
560 printk("%s: unrecognised CSD structure version %d\n",
561 mmc_hostname(card->host), csd_struct);
562 mmc_card_set_bad(card);
563 return;
564 }
565
566 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
567 m = UNSTUFF_BITS(resp, 115, 4);
568 e = UNSTUFF_BITS(resp, 112, 3);
569 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
570 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
571
572 m = UNSTUFF_BITS(resp, 99, 4);
573 e = UNSTUFF_BITS(resp, 96, 3);
574 csd->max_dtr = tran_exp[e] * tran_mant[m];
575 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
576
577 e = UNSTUFF_BITS(resp, 47, 3);
578 m = UNSTUFF_BITS(resp, 62, 12);
579 csd->capacity = (1 + m) << (e + 2);
580
581 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
582 }
583 }
584
585 /*
586 * Given a 64-bit response, decode to our card SCR structure.
587 */
588 static void mmc_decode_scr(struct mmc_card *card)
589 {
590 struct sd_scr *scr = &card->scr;
591 unsigned int scr_struct;
592 u32 resp[4];
593
594 BUG_ON(!mmc_card_sd(card));
595
596 resp[3] = card->raw_scr[1];
597 resp[2] = card->raw_scr[0];
598
599 scr_struct = UNSTUFF_BITS(resp, 60, 4);
600 if (scr_struct != 0) {
601 printk("%s: unrecognised SCR structure version %d\n",
602 mmc_hostname(card->host), scr_struct);
603 mmc_card_set_bad(card);
604 return;
605 }
606
607 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
608 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
609 }
610
611 /*
612 * Locate a MMC card on this MMC host given a raw CID.
613 */
614 static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid)
615 {
616 struct mmc_card *card;
617
618 list_for_each_entry(card, &host->cards, node) {
619 if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0)
620 return card;
621 }
622 return NULL;
623 }
624
625 /*
626 * Allocate a new MMC card, and assign a unique RCA.
627 */
628 static struct mmc_card *
629 mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca)
630 {
631 struct mmc_card *card, *c;
632 unsigned int rca = *frca;
633
634 card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL);
635 if (!card)
636 return ERR_PTR(-ENOMEM);
637
638 mmc_init_card(card, host);
639 memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid));
640
641 again:
642 list_for_each_entry(c, &host->cards, node)
643 if (c->rca == rca) {
644 rca++;
645 goto again;
646 }
647
648 card->rca = rca;
649
650 *frca = rca;
651
652 return card;
653 }
654
655 /*
656 * Tell attached cards to go to IDLE state
657 */
658 static void mmc_idle_cards(struct mmc_host *host)
659 {
660 struct mmc_command cmd;
661
662 host->ios.chip_select = MMC_CS_HIGH;
663 host->ops->set_ios(host, &host->ios);
664
665 mmc_delay(1);
666
667 cmd.opcode = MMC_GO_IDLE_STATE;
668 cmd.arg = 0;
669 cmd.flags = MMC_RSP_NONE;
670
671 mmc_wait_for_cmd(host, &cmd, 0);
672
673 mmc_delay(1);
674
675 host->ios.chip_select = MMC_CS_DONTCARE;
676 host->ops->set_ios(host, &host->ios);
677
678 mmc_delay(1);
679 }
680
681 /*
682 * Apply power to the MMC stack. This is a two-stage process.
683 * First, we enable power to the card without the clock running.
684 * We then wait a bit for the power to stabilise. Finally,
685 * enable the bus drivers and clock to the card.
686 *
687 * We must _NOT_ enable the clock prior to power stablising.
688 *
689 * If a host does all the power sequencing itself, ignore the
690 * initial MMC_POWER_UP stage.
691 */
692 static void mmc_power_up(struct mmc_host *host)
693 {
694 int bit = fls(host->ocr_avail) - 1;
695
696 host->ios.vdd = bit;
697 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
698 host->ios.chip_select = MMC_CS_DONTCARE;
699 host->ios.power_mode = MMC_POWER_UP;
700 host->ios.bus_width = MMC_BUS_WIDTH_1;
701 host->ops->set_ios(host, &host->ios);
702
703 mmc_delay(1);
704
705 host->ios.clock = host->f_min;
706 host->ios.power_mode = MMC_POWER_ON;
707 host->ops->set_ios(host, &host->ios);
708
709 mmc_delay(2);
710 }
711
712 static void mmc_power_off(struct mmc_host *host)
713 {
714 host->ios.clock = 0;
715 host->ios.vdd = 0;
716 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
717 host->ios.chip_select = MMC_CS_DONTCARE;
718 host->ios.power_mode = MMC_POWER_OFF;
719 host->ios.bus_width = MMC_BUS_WIDTH_1;
720 host->ops->set_ios(host, &host->ios);
721 }
722
723 static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
724 {
725 struct mmc_command cmd;
726 int i, err = 0;
727
728 cmd.opcode = MMC_SEND_OP_COND;
729 cmd.arg = ocr;
730 cmd.flags = MMC_RSP_R3;
731
732 for (i = 100; i; i--) {
733 err = mmc_wait_for_cmd(host, &cmd, 0);
734 if (err != MMC_ERR_NONE)
735 break;
736
737 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
738 break;
739
740 err = MMC_ERR_TIMEOUT;
741
742 mmc_delay(10);
743 }
744
745 if (rocr)
746 *rocr = cmd.resp[0];
747
748 return err;
749 }
750
751 static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
752 {
753 struct mmc_command cmd;
754 int i, err = 0;
755
756 cmd.opcode = SD_APP_OP_COND;
757 cmd.arg = ocr;
758 cmd.flags = MMC_RSP_R3;
759
760 for (i = 100; i; i--) {
761 err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES);
762 if (err != MMC_ERR_NONE)
763 break;
764
765 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
766 break;
767
768 err = MMC_ERR_TIMEOUT;
769
770 mmc_delay(10);
771 }
772
773 if (rocr)
774 *rocr = cmd.resp[0];
775
776 return err;
777 }
778
779 /*
780 * Discover cards by requesting their CID. If this command
781 * times out, it is not an error; there are no further cards
782 * to be discovered. Add new cards to the list.
783 *
784 * Create a mmc_card entry for each discovered card, assigning
785 * it an RCA, and save the raw CID for decoding later.
786 */
787 static void mmc_discover_cards(struct mmc_host *host)
788 {
789 struct mmc_card *card;
790 unsigned int first_rca = 1, err;
791
792 while (1) {
793 struct mmc_command cmd;
794
795 cmd.opcode = MMC_ALL_SEND_CID;
796 cmd.arg = 0;
797 cmd.flags = MMC_RSP_R2;
798
799 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
800 if (err == MMC_ERR_TIMEOUT) {
801 err = MMC_ERR_NONE;
802 break;
803 }
804 if (err != MMC_ERR_NONE) {
805 printk(KERN_ERR "%s: error requesting CID: %d\n",
806 mmc_hostname(host), err);
807 break;
808 }
809
810 card = mmc_find_card(host, cmd.resp);
811 if (!card) {
812 card = mmc_alloc_card(host, cmd.resp, &first_rca);
813 if (IS_ERR(card)) {
814 err = PTR_ERR(card);
815 break;
816 }
817 list_add(&card->node, &host->cards);
818 }
819
820 card->state &= ~MMC_STATE_DEAD;
821
822 if (host->mode == MMC_MODE_SD) {
823 mmc_card_set_sd(card);
824
825 cmd.opcode = SD_SEND_RELATIVE_ADDR;
826 cmd.arg = 0;
827 cmd.flags = MMC_RSP_R6;
828
829 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
830 if (err != MMC_ERR_NONE)
831 mmc_card_set_dead(card);
832 else {
833 card->rca = cmd.resp[0] >> 16;
834
835 if (!host->ops->get_ro) {
836 printk(KERN_WARNING "%s: host does not "
837 "support reading read-only "
838 "switch. assuming write-enable.\n",
839 mmc_hostname(host));
840 } else {
841 if (host->ops->get_ro(host))
842 mmc_card_set_readonly(card);
843 }
844 }
845 } else {
846 cmd.opcode = MMC_SET_RELATIVE_ADDR;
847 cmd.arg = card->rca << 16;
848 cmd.flags = MMC_RSP_R1;
849
850 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
851 if (err != MMC_ERR_NONE)
852 mmc_card_set_dead(card);
853 }
854 }
855 }
856
857 static void mmc_read_csds(struct mmc_host *host)
858 {
859 struct mmc_card *card;
860
861 list_for_each_entry(card, &host->cards, node) {
862 struct mmc_command cmd;
863 int err;
864
865 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
866 continue;
867
868 cmd.opcode = MMC_SEND_CSD;
869 cmd.arg = card->rca << 16;
870 cmd.flags = MMC_RSP_R2;
871
872 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
873 if (err != MMC_ERR_NONE) {
874 mmc_card_set_dead(card);
875 continue;
876 }
877
878 memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd));
879
880 mmc_decode_csd(card);
881 mmc_decode_cid(card);
882 }
883 }
884
885 static void mmc_read_scrs(struct mmc_host *host)
886 {
887 int err;
888 struct mmc_card *card;
889
890 struct mmc_request mrq;
891 struct mmc_command cmd;
892 struct mmc_data data;
893
894 struct scatterlist sg;
895
896 list_for_each_entry(card, &host->cards, node) {
897 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
898 continue;
899 if (!mmc_card_sd(card))
900 continue;
901
902 err = mmc_select_card(host, card);
903 if (err != MMC_ERR_NONE) {
904 mmc_card_set_dead(card);
905 continue;
906 }
907
908 memset(&cmd, 0, sizeof(struct mmc_command));
909
910 cmd.opcode = MMC_APP_CMD;
911 cmd.arg = card->rca << 16;
912 cmd.flags = MMC_RSP_R1;
913
914 err = mmc_wait_for_cmd(host, &cmd, 0);
915 if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) {
916 mmc_card_set_dead(card);
917 continue;
918 }
919
920 memset(&cmd, 0, sizeof(struct mmc_command));
921
922 cmd.opcode = SD_APP_SEND_SCR;
923 cmd.arg = 0;
924 cmd.flags = MMC_RSP_R1;
925
926 memset(&data, 0, sizeof(struct mmc_data));
927
928 data.timeout_ns = card->csd.tacc_ns * 10;
929 data.timeout_clks = card->csd.tacc_clks * 10;
930 data.blksz_bits = 3;
931 data.blocks = 1;
932 data.flags = MMC_DATA_READ;
933 data.sg = &sg;
934 data.sg_len = 1;
935
936 memset(&mrq, 0, sizeof(struct mmc_request));
937
938 mrq.cmd = &cmd;
939 mrq.data = &data;
940
941 sg_init_one(&sg, (u8*)card->raw_scr, 8);
942
943 mmc_wait_for_req(host, &mrq);
944
945 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
946 mmc_card_set_dead(card);
947 continue;
948 }
949
950 card->raw_scr[0] = ntohl(card->raw_scr[0]);
951 card->raw_scr[1] = ntohl(card->raw_scr[1]);
952
953 mmc_decode_scr(card);
954 }
955
956 mmc_deselect_cards(host);
957 }
958
959 static unsigned int mmc_calculate_clock(struct mmc_host *host)
960 {
961 struct mmc_card *card;
962 unsigned int max_dtr = host->f_max;
963
964 list_for_each_entry(card, &host->cards, node)
965 if (!mmc_card_dead(card) && max_dtr > card->csd.max_dtr)
966 max_dtr = card->csd.max_dtr;
967
968 DBG("MMC: selected %d.%03dMHz transfer rate\n",
969 max_dtr / 1000000, (max_dtr / 1000) % 1000);
970
971 return max_dtr;
972 }
973
974 /*
975 * Check whether cards we already know about are still present.
976 * We do this by requesting status, and checking whether a card
977 * responds.
978 *
979 * A request for status does not cause a state change in data
980 * transfer mode.
981 */
982 static void mmc_check_cards(struct mmc_host *host)
983 {
984 struct list_head *l, *n;
985
986 mmc_deselect_cards(host);
987
988 list_for_each_safe(l, n, &host->cards) {
989 struct mmc_card *card = mmc_list_to_card(l);
990 struct mmc_command cmd;
991 int err;
992
993 cmd.opcode = MMC_SEND_STATUS;
994 cmd.arg = card->rca << 16;
995 cmd.flags = MMC_RSP_R1;
996
997 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
998 if (err == MMC_ERR_NONE)
999 continue;
1000
1001 mmc_card_set_dead(card);
1002 }
1003 }
1004
1005 static void mmc_setup(struct mmc_host *host)
1006 {
1007 if (host->ios.power_mode != MMC_POWER_ON) {
1008 int err;
1009 u32 ocr;
1010
1011 host->mode = MMC_MODE_SD;
1012
1013 mmc_power_up(host);
1014 mmc_idle_cards(host);
1015
1016 err = mmc_send_app_op_cond(host, 0, &ocr);
1017
1018 /*
1019 * If we fail to detect any SD cards then try
1020 * searching for MMC cards.
1021 */
1022 if (err != MMC_ERR_NONE) {
1023 host->mode = MMC_MODE_MMC;
1024
1025 err = mmc_send_op_cond(host, 0, &ocr);
1026 if (err != MMC_ERR_NONE)
1027 return;
1028 }
1029
1030 host->ocr = mmc_select_voltage(host, ocr);
1031
1032 /*
1033 * Since we're changing the OCR value, we seem to
1034 * need to tell some cards to go back to the idle
1035 * state. We wait 1ms to give cards time to
1036 * respond.
1037 */
1038 if (host->ocr)
1039 mmc_idle_cards(host);
1040 } else {
1041 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1042 host->ios.clock = host->f_min;
1043 host->ops->set_ios(host, &host->ios);
1044
1045 /*
1046 * We should remember the OCR mask from the existing
1047 * cards, and detect the new cards OCR mask, combine
1048 * the two and re-select the VDD. However, if we do
1049 * change VDD, we should do an idle, and then do a
1050 * full re-initialisation. We would need to notify
1051 * drivers so that they can re-setup the cards as
1052 * well, while keeping their queues at bay.
1053 *
1054 * For the moment, we take the easy way out - if the
1055 * new cards don't like our currently selected VDD,
1056 * they drop off the bus.
1057 */
1058 }
1059
1060 if (host->ocr == 0)
1061 return;
1062
1063 /*
1064 * Send the selected OCR multiple times... until the cards
1065 * all get the idea that they should be ready for CMD2.
1066 * (My SanDisk card seems to need this.)
1067 */
1068 if (host->mode == MMC_MODE_SD)
1069 mmc_send_app_op_cond(host, host->ocr, NULL);
1070 else
1071 mmc_send_op_cond(host, host->ocr, NULL);
1072
1073 mmc_discover_cards(host);
1074
1075 /*
1076 * Ok, now switch to push-pull mode.
1077 */
1078 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1079 host->ops->set_ios(host, &host->ios);
1080
1081 mmc_read_csds(host);
1082
1083 if (host->mode == MMC_MODE_SD)
1084 mmc_read_scrs(host);
1085 }
1086
1087
1088 /**
1089 * mmc_detect_change - process change of state on a MMC socket
1090 * @host: host which changed state.
1091 * @delay: optional delay to wait before detection (jiffies)
1092 *
1093 * All we know is that card(s) have been inserted or removed
1094 * from the socket(s). We don't know which socket or cards.
1095 */
1096 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1097 {
1098 if (delay)
1099 schedule_delayed_work(&host->detect, delay);
1100 else
1101 schedule_work(&host->detect);
1102 }
1103
1104 EXPORT_SYMBOL(mmc_detect_change);
1105
1106
1107 static void mmc_rescan(void *data)
1108 {
1109 struct mmc_host *host = data;
1110 struct list_head *l, *n;
1111
1112 mmc_claim_host(host);
1113
1114 if (host->ios.power_mode == MMC_POWER_ON)
1115 mmc_check_cards(host);
1116
1117 mmc_setup(host);
1118
1119 if (!list_empty(&host->cards)) {
1120 /*
1121 * (Re-)calculate the fastest clock rate which the
1122 * attached cards and the host support.
1123 */
1124 host->ios.clock = mmc_calculate_clock(host);
1125 host->ops->set_ios(host, &host->ios);
1126 }
1127
1128 mmc_release_host(host);
1129
1130 list_for_each_safe(l, n, &host->cards) {
1131 struct mmc_card *card = mmc_list_to_card(l);
1132
1133 /*
1134 * If this is a new and good card, register it.
1135 */
1136 if (!mmc_card_present(card) && !mmc_card_dead(card)) {
1137 if (mmc_register_card(card))
1138 mmc_card_set_dead(card);
1139 else
1140 mmc_card_set_present(card);
1141 }
1142
1143 /*
1144 * If this card is dead, destroy it.
1145 */
1146 if (mmc_card_dead(card)) {
1147 list_del(&card->node);
1148 mmc_remove_card(card);
1149 }
1150 }
1151
1152 /*
1153 * If we discover that there are no cards on the
1154 * bus, turn off the clock and power down.
1155 */
1156 if (list_empty(&host->cards))
1157 mmc_power_off(host);
1158 }
1159
1160
1161 /**
1162 * mmc_alloc_host - initialise the per-host structure.
1163 * @extra: sizeof private data structure
1164 * @dev: pointer to host device model structure
1165 *
1166 * Initialise the per-host structure.
1167 */
1168 struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
1169 {
1170 struct mmc_host *host;
1171
1172 host = mmc_alloc_host_sysfs(extra, dev);
1173 if (host) {
1174 spin_lock_init(&host->lock);
1175 init_waitqueue_head(&host->wq);
1176 INIT_LIST_HEAD(&host->cards);
1177 INIT_WORK(&host->detect, mmc_rescan, host);
1178
1179 /*
1180 * By default, hosts do not support SGIO or large requests.
1181 * They have to set these according to their abilities.
1182 */
1183 host->max_hw_segs = 1;
1184 host->max_phys_segs = 1;
1185 host->max_sectors = 1 << (PAGE_CACHE_SHIFT - 9);
1186 host->max_seg_size = PAGE_CACHE_SIZE;
1187 }
1188
1189 return host;
1190 }
1191
1192 EXPORT_SYMBOL(mmc_alloc_host);
1193
1194 /**
1195 * mmc_add_host - initialise host hardware
1196 * @host: mmc host
1197 */
1198 int mmc_add_host(struct mmc_host *host)
1199 {
1200 int ret;
1201
1202 ret = mmc_add_host_sysfs(host);
1203 if (ret == 0) {
1204 mmc_power_off(host);
1205 mmc_detect_change(host, 0);
1206 }
1207
1208 return ret;
1209 }
1210
1211 EXPORT_SYMBOL(mmc_add_host);
1212
1213 /**
1214 * mmc_remove_host - remove host hardware
1215 * @host: mmc host
1216 *
1217 * Unregister and remove all cards associated with this host,
1218 * and power down the MMC bus.
1219 */
1220 void mmc_remove_host(struct mmc_host *host)
1221 {
1222 struct list_head *l, *n;
1223
1224 list_for_each_safe(l, n, &host->cards) {
1225 struct mmc_card *card = mmc_list_to_card(l);
1226
1227 mmc_remove_card(card);
1228 }
1229
1230 mmc_power_off(host);
1231 mmc_remove_host_sysfs(host);
1232 }
1233
1234 EXPORT_SYMBOL(mmc_remove_host);
1235
1236 /**
1237 * mmc_free_host - free the host structure
1238 * @host: mmc host
1239 *
1240 * Free the host once all references to it have been dropped.
1241 */
1242 void mmc_free_host(struct mmc_host *host)
1243 {
1244 flush_scheduled_work();
1245 mmc_free_host_sysfs(host);
1246 }
1247
1248 EXPORT_SYMBOL(mmc_free_host);
1249
1250 #ifdef CONFIG_PM
1251
1252 /**
1253 * mmc_suspend_host - suspend a host
1254 * @host: mmc host
1255 * @state: suspend mode (PM_SUSPEND_xxx)
1256 */
1257 int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
1258 {
1259 mmc_claim_host(host);
1260 mmc_deselect_cards(host);
1261 mmc_power_off(host);
1262 mmc_release_host(host);
1263
1264 return 0;
1265 }
1266
1267 EXPORT_SYMBOL(mmc_suspend_host);
1268
1269 /**
1270 * mmc_resume_host - resume a previously suspended host
1271 * @host: mmc host
1272 */
1273 int mmc_resume_host(struct mmc_host *host)
1274 {
1275 mmc_rescan(host);
1276
1277 return 0;
1278 }
1279
1280 EXPORT_SYMBOL(mmc_resume_host);
1281
1282 #endif
1283
1284 MODULE_LICENSE("GPL");
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