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[net-next-2.6.git] / drivers / mmc / mmc.c
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1da177e4
LT		 1/*
2 * linux/drivers/mmc/mmc.c
3 *
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5b4fd9ae
PO		 5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * SD support Copyright (C) 2005 Pierre Ossman, All Rights Reserved.
1da177e4
LT		 7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12#include <linux/config.h>
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/interrupt.h>
16#include <linux/completion.h>
17#include <linux/device.h>
18#include <linux/delay.h>
19#include <linux/pagemap.h>
20#include <linux/err.h>
b57c43ad
PO		 21#include <asm/scatterlist.h>
22#include <linux/scatterlist.h>
1da177e4
LT		 23
24#include <linux/mmc/card.h>
25#include <linux/mmc/host.h>
26#include <linux/mmc/protocol.h>
27
28#include "mmc.h"
29
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 */
41static 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
47static const unsigned int tran_exp[] = {
48 10000, 100000, 1000000, 10000000,
49 0, 0, 0, 0
50};
51
52static 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
57static const unsigned int tacc_exp[] = {
58 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
59};
60
61static 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 */
76void 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
92EXPORT_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 */
102void
103mmc_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
125EXPORT_SYMBOL(mmc_start_request);
126
127static void mmc_wait_done(struct mmc_request *mrq)
128{
129 complete(mrq->done_data);
130}
131
132int 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
146EXPORT_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 */
158int 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
177EXPORT_SYMBOL(mmc_wait_for_cmd);
178
335eadf2
PO		 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 */
192int 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;
1da177e4 240
335eadf2
PO		 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
251EXPORT_SYMBOL(mmc_wait_for_app_cmd);
1da177e4 252
b57c43ad
PO		 253static int mmc_select_card(struct mmc_host *host, struct mmc_card *card);
254
1da177e4
LT		 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 */
266int __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
b57c43ad
PO		 287 if (card != (void *)-1) {
288 err = mmc_select_card(host, card);
289 if (err != MMC_ERR_NONE)
290 return err;
1da177e4
LT		 291 }
292
293 return err;
294}
295
296EXPORT_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 */
305void 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
318EXPORT_SYMBOL(mmc_release_host);
319
b57c43ad
PO		 320static 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
f218278a
PO		 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
b57c43ad
PO		 374 return MMC_ERR_NONE;
375}
376
1da177e4
LT		 377/*
378 * Ensure that no card is selected.
379 */
380static 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
396static 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 */
410static 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 */
448static 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
335eadf2
PO		 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 */
a00fc090 473 } else {
335eadf2
PO		 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 }
1da177e4
LT		 517 }
518}
519
520/*
521 * Given a 128-bit response, decode to our card CSD structure.
522 */
523static 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
335eadf2
PO		 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);
a00fc090 553 } else {
335eadf2
PO		 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 }
1da177e4 565
335eadf2
PO		 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;
1da177e4 571
335eadf2
PO		 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);
1da177e4 576
335eadf2
PO		 577 e = UNSTUFF_BITS(resp, 47, 3);
578 m = UNSTUFF_BITS(resp, 62, 12);
579 csd->capacity = (1 + m) << (e + 2);
1da177e4 580
335eadf2
PO		 581 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
582 }
1da177e4
LT		 583}
584
b57c43ad
PO		 585/*
586 * Given a 64-bit response, decode to our card SCR structure.
587 */
588static 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
1da177e4
LT		 611/*
612 * Locate a MMC card on this MMC host given a raw CID.
613 */
614static 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 */
628static struct mmc_card *
629mmc_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 */
658static void mmc_idle_cards(struct mmc_host *host)
659{
660 struct mmc_command cmd;
661
865e9f13
PO		 662 host->ios.chip_select = MMC_CS_HIGH;
663 host->ops->set_ios(host, &host->ios);
664
665 mmc_delay(1);
666
1da177e4
LT		 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);
865e9f13
PO		 674
675 host->ios.chip_select = MMC_CS_DONTCARE;
676 host->ops->set_ios(host, &host->ios);
677
678 mmc_delay(1);
1da177e4
LT		 679}
680
681/*
682 * Apply power to the MMC stack.
683 */
684static void mmc_power_up(struct mmc_host *host)
685{
686 int bit = fls(host->ocr_avail) - 1;
687
688 host->ios.vdd = bit;
689 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
865e9f13 690 host->ios.chip_select = MMC_CS_DONTCARE;
1da177e4 691 host->ios.power_mode = MMC_POWER_UP;
f218278a 692 host->ios.bus_width = MMC_BUS_WIDTH_1;
1da177e4
LT		 693 host->ops->set_ios(host, &host->ios);
694
695 mmc_delay(1);
696
697 host->ios.clock = host->f_min;
698 host->ios.power_mode = MMC_POWER_ON;
699 host->ops->set_ios(host, &host->ios);
700
701 mmc_delay(2);
702}
703
704static void mmc_power_off(struct mmc_host *host)
705{
706 host->ios.clock = 0;
707 host->ios.vdd = 0;
708 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
865e9f13 709 host->ios.chip_select = MMC_CS_DONTCARE;
1da177e4 710 host->ios.power_mode = MMC_POWER_OFF;
f218278a 711 host->ios.bus_width = MMC_BUS_WIDTH_1;
1da177e4
LT		 712 host->ops->set_ios(host, &host->ios);
713}
714
715static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
716{
717 struct mmc_command cmd;
718 int i, err = 0;
719
720 cmd.opcode = MMC_SEND_OP_COND;
721 cmd.arg = ocr;
722 cmd.flags = MMC_RSP_R3;
723
724 for (i = 100; i; i--) {
725 err = mmc_wait_for_cmd(host, &cmd, 0);
726 if (err != MMC_ERR_NONE)
727 break;
728
729 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
730 break;
731
732 err = MMC_ERR_TIMEOUT;
733
734 mmc_delay(10);
735 }
736
737 if (rocr)
738 *rocr = cmd.resp[0];
739
740 return err;
741}
742
335eadf2
PO		 743static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
744{
745 struct mmc_command cmd;
746 int i, err = 0;
747
748 cmd.opcode = SD_APP_OP_COND;
749 cmd.arg = ocr;
750 cmd.flags = MMC_RSP_R3;
751
752 for (i = 100; i; i--) {
753 err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES);
754 if (err != MMC_ERR_NONE)
755 break;
756
757 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
758 break;
759
760 err = MMC_ERR_TIMEOUT;
761
762 mmc_delay(10);
763 }
764
765 if (rocr)
766 *rocr = cmd.resp[0];
767
768 return err;
769}
770
1da177e4
LT		 771/*
772 * Discover cards by requesting their CID. If this command
773 * times out, it is not an error; there are no further cards
774 * to be discovered. Add new cards to the list.
775 *
776 * Create a mmc_card entry for each discovered card, assigning
777 * it an RCA, and save the raw CID for decoding later.
778 */
779static void mmc_discover_cards(struct mmc_host *host)
780{
781 struct mmc_card *card;
782 unsigned int first_rca = 1, err;
783
784 while (1) {
785 struct mmc_command cmd;
786
787 cmd.opcode = MMC_ALL_SEND_CID;
788 cmd.arg = 0;
789 cmd.flags = MMC_RSP_R2;
790
791 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
792 if (err == MMC_ERR_TIMEOUT) {
793 err = MMC_ERR_NONE;
794 break;
795 }
796 if (err != MMC_ERR_NONE) {
797 printk(KERN_ERR "%s: error requesting CID: %d\n",
d366b643 798 mmc_hostname(host), err);
1da177e4
LT		 799 break;
800 }
801
802 card = mmc_find_card(host, cmd.resp);
803 if (!card) {
804 card = mmc_alloc_card(host, cmd.resp, &first_rca);
805 if (IS_ERR(card)) {
806 err = PTR_ERR(card);
807 break;
808 }
809 list_add(&card->node, &host->cards);
810 }
811
812 card->state &= ~MMC_STATE_DEAD;
813
335eadf2
PO		 814 if (host->mode == MMC_MODE_SD) {
815 mmc_card_set_sd(card);
1da177e4 816
335eadf2
PO		 817 cmd.opcode = SD_SEND_RELATIVE_ADDR;
818 cmd.arg = 0;
24117def 819 cmd.flags = MMC_RSP_R6;
335eadf2
PO		 820
821 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
822 if (err != MMC_ERR_NONE)
823 mmc_card_set_dead(card);
a00fc090 824 else {
335eadf2 825 card->rca = cmd.resp[0] >> 16;
a00fc090
PO		 826
827 if (!host->ops->get_ro) {
828 printk(KERN_WARNING "%s: host does not "
829 "support reading read-only "
830 "switch. assuming write-enable.\n",
831 mmc_hostname(host));
832 } else {
833 if (host->ops->get_ro(host))
834 mmc_card_set_readonly(card);
835 }
836 }
837 } else {
335eadf2
PO		 838 cmd.opcode = MMC_SET_RELATIVE_ADDR;
839 cmd.arg = card->rca << 16;
840 cmd.flags = MMC_RSP_R1;
841
842 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
843 if (err != MMC_ERR_NONE)
844 mmc_card_set_dead(card);
845 }
1da177e4
LT		 846 }
847}
848
849static void mmc_read_csds(struct mmc_host *host)
850{
851 struct mmc_card *card;
852
853 list_for_each_entry(card, &host->cards, node) {
854 struct mmc_command cmd;
855 int err;
856
857 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
858 continue;
859
860 cmd.opcode = MMC_SEND_CSD;
861 cmd.arg = card->rca << 16;
862 cmd.flags = MMC_RSP_R2;
863
864 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
865 if (err != MMC_ERR_NONE) {
866 mmc_card_set_dead(card);
867 continue;
868 }
869
870 memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd));
871
872 mmc_decode_csd(card);
873 mmc_decode_cid(card);
874 }
875}
876
b57c43ad
PO		 877static void mmc_read_scrs(struct mmc_host *host)
878{
879 int err;
880 struct mmc_card *card;
881
882 struct mmc_request mrq;
883 struct mmc_command cmd;
884 struct mmc_data data;
885
886 struct scatterlist sg;
887
888 list_for_each_entry(card, &host->cards, node) {
889 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
890 continue;
891 if (!mmc_card_sd(card))
892 continue;
893
894 err = mmc_select_card(host, card);
895 if (err != MMC_ERR_NONE) {
896 mmc_card_set_dead(card);
897 continue;
898 }
899
900 memset(&cmd, 0, sizeof(struct mmc_command));
901
902 cmd.opcode = MMC_APP_CMD;
903 cmd.arg = card->rca << 16;
904 cmd.flags = MMC_RSP_R1;
905
906 err = mmc_wait_for_cmd(host, &cmd, 0);
907 if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) {
908 mmc_card_set_dead(card);
909 continue;
910 }
911
912 memset(&cmd, 0, sizeof(struct mmc_command));
913
914 cmd.opcode = SD_APP_SEND_SCR;
915 cmd.arg = 0;
916 cmd.flags = MMC_RSP_R1;
917
918 memset(&data, 0, sizeof(struct mmc_data));
919
920 data.timeout_ns = card->csd.tacc_ns * 10;
921 data.timeout_clks = card->csd.tacc_clks * 10;
922 data.blksz_bits = 3;
923 data.blocks = 1;
924 data.flags = MMC_DATA_READ;
925 data.sg = &sg;
926 data.sg_len = 1;
927
928 memset(&mrq, 0, sizeof(struct mmc_request));
929
930 mrq.cmd = &cmd;
931 mrq.data = &data;
932
933 sg_init_one(&sg, (u8*)card->raw_scr, 8);
934
e781de44
PO		 935 mmc_wait_for_req(host, &mrq);
936
937 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
b57c43ad
PO		 938 mmc_card_set_dead(card);
939 continue;
940 }
941
942 card->raw_scr[0] = ntohl(card->raw_scr[0]);
943 card->raw_scr[1] = ntohl(card->raw_scr[1]);
944
945 mmc_decode_scr(card);
946 }
947
948 mmc_deselect_cards(host);
949}
950
1da177e4
LT		 951static unsigned int mmc_calculate_clock(struct mmc_host *host)
952{
953 struct mmc_card *card;
954 unsigned int max_dtr = host->f_max;
955
956 list_for_each_entry(card, &host->cards, node)
957 if (!mmc_card_dead(card) && max_dtr > card->csd.max_dtr)
958 max_dtr = card->csd.max_dtr;
959
960 DBG("MMC: selected %d.%03dMHz transfer rate\n",
961 max_dtr / 1000000, (max_dtr / 1000) % 1000);
962
963 return max_dtr;
964}
965
966/*
967 * Check whether cards we already know about are still present.
968 * We do this by requesting status, and checking whether a card
969 * responds.
970 *
971 * A request for status does not cause a state change in data
972 * transfer mode.
973 */
974static void mmc_check_cards(struct mmc_host *host)
975{
976 struct list_head *l, *n;
977
978 mmc_deselect_cards(host);
979
980 list_for_each_safe(l, n, &host->cards) {
981 struct mmc_card *card = mmc_list_to_card(l);
982 struct mmc_command cmd;
983 int err;
984
985 cmd.opcode = MMC_SEND_STATUS;
986 cmd.arg = card->rca << 16;
987 cmd.flags = MMC_RSP_R1;
988
989 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
990 if (err == MMC_ERR_NONE)
991 continue;
992
993 mmc_card_set_dead(card);
994 }
995}
996
997static void mmc_setup(struct mmc_host *host)
998{
999 if (host->ios.power_mode != MMC_POWER_ON) {
1000 int err;
1001 u32 ocr;
1002
a00fc090 1003 host->mode = MMC_MODE_SD;
335eadf2 1004
1da177e4
LT		 1005 mmc_power_up(host);
1006 mmc_idle_cards(host);
1007
a00fc090 1008 err = mmc_send_app_op_cond(host, 0, &ocr);
335eadf2
PO		 1009
1010 /*
a00fc090
PO		 1011 * If we fail to detect any SD cards then try
1012 * searching for MMC cards.
335eadf2 1013 */
a00fc090
PO		 1014 if (err != MMC_ERR_NONE) {
1015 host->mode = MMC_MODE_MMC;
1016
1017 err = mmc_send_op_cond(host, 0, &ocr);
335eadf2
PO		 1018 if (err != MMC_ERR_NONE)
1019 return;
335eadf2 1020 }
1da177e4
LT		 1021
1022 host->ocr = mmc_select_voltage(host, ocr);
1023
1024 /*
1025 * Since we're changing the OCR value, we seem to
1026 * need to tell some cards to go back to the idle
1027 * state. We wait 1ms to give cards time to
1028 * respond.
1029 */
1030 if (host->ocr)
1031 mmc_idle_cards(host);
1032 } else {
1033 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1034 host->ios.clock = host->f_min;
1035 host->ops->set_ios(host, &host->ios);
1036
1037 /*
1038 * We should remember the OCR mask from the existing
1039 * cards, and detect the new cards OCR mask, combine
1040 * the two and re-select the VDD. However, if we do
1041 * change VDD, we should do an idle, and then do a
1042 * full re-initialisation. We would need to notify
1043 * drivers so that they can re-setup the cards as
1044 * well, while keeping their queues at bay.
1045 *
1046 * For the moment, we take the easy way out - if the
1047 * new cards don't like our currently selected VDD,
1048 * they drop off the bus.
1049 */
1050 }
1051
1052 if (host->ocr == 0)
1053 return;
1054
1055 /*
1056 * Send the selected OCR multiple times... until the cards
1057 * all get the idea that they should be ready for CMD2.
1058 * (My SanDisk card seems to need this.)
1059 */
335eadf2
PO		 1060 if (host->mode == MMC_MODE_SD)
1061 mmc_send_app_op_cond(host, host->ocr, NULL);
1062 else
1063 mmc_send_op_cond(host, host->ocr, NULL);
1da177e4
LT		 1064
1065 mmc_discover_cards(host);
1066
1067 /*
1068 * Ok, now switch to push-pull mode.
1069 */
1070 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1071 host->ops->set_ios(host, &host->ios);
1072
1073 mmc_read_csds(host);
b57c43ad
PO		 1074
1075 if (host->mode == MMC_MODE_SD)
1076 mmc_read_scrs(host);
1da177e4
LT		 1077}
1078
1079
1080/**
1081 * mmc_detect_change - process change of state on a MMC socket
1082 * @host: host which changed state.
8dc00335 1083 * @delay: optional delay to wait before detection (jiffies)
1da177e4
LT		 1084 *
1085 * All we know is that card(s) have been inserted or removed
1086 * from the socket(s). We don't know which socket or cards.
1087 */
8dc00335 1088void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1da177e4 1089{
8dc00335
RP		 1090 if (delay)
1091 schedule_delayed_work(&host->detect, delay);
1092 else
1093 schedule_work(&host->detect);
1da177e4
LT		 1094}
1095
1096EXPORT_SYMBOL(mmc_detect_change);
1097
1098
1099static void mmc_rescan(void *data)
1100{
1101 struct mmc_host *host = data;
1102 struct list_head *l, *n;
1103
1104 mmc_claim_host(host);
1105
1106 if (host->ios.power_mode == MMC_POWER_ON)
1107 mmc_check_cards(host);
1108
1109 mmc_setup(host);
1110
1111 if (!list_empty(&host->cards)) {
1112 /*
1113 * (Re-)calculate the fastest clock rate which the
1114 * attached cards and the host support.
1115 */
1116 host->ios.clock = mmc_calculate_clock(host);
1117 host->ops->set_ios(host, &host->ios);
1118 }
1119
1120 mmc_release_host(host);
1121
1122 list_for_each_safe(l, n, &host->cards) {
1123 struct mmc_card *card = mmc_list_to_card(l);
1124
1125 /*
1126 * If this is a new and good card, register it.
1127 */
1128 if (!mmc_card_present(card) && !mmc_card_dead(card)) {
1129 if (mmc_register_card(card))
1130 mmc_card_set_dead(card);
1131 else
1132 mmc_card_set_present(card);
1133 }
1134
1135 /*
1136 * If this card is dead, destroy it.
1137 */
1138 if (mmc_card_dead(card)) {
1139 list_del(&card->node);
1140 mmc_remove_card(card);
1141 }
1142 }
1143
1144 /*
1145 * If we discover that there are no cards on the
1146 * bus, turn off the clock and power down.
1147 */
1148 if (list_empty(&host->cards))
1149 mmc_power_off(host);
1150}
1151
1152
1153/**
1154 * mmc_alloc_host - initialise the per-host structure.
1155 * @extra: sizeof private data structure
1156 * @dev: pointer to host device model structure
1157 *
1158 * Initialise the per-host structure.
1159 */
1160struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
1161{
1162 struct mmc_host *host;
1163
00b137cf 1164 host = mmc_alloc_host_sysfs(extra, dev);
1da177e4 1165 if (host) {
1da177e4
LT		 1166 spin_lock_init(&host->lock);
1167 init_waitqueue_head(&host->wq);
1168 INIT_LIST_HEAD(&host->cards);
1169 INIT_WORK(&host->detect, mmc_rescan, host);
1170
1da177e4
LT		 1171 /*
1172 * By default, hosts do not support SGIO or large requests.
1173 * They have to set these according to their abilities.
1174 */
1175 host->max_hw_segs = 1;
1176 host->max_phys_segs = 1;
1177 host->max_sectors = 1 << (PAGE_CACHE_SHIFT - 9);
1178 host->max_seg_size = PAGE_CACHE_SIZE;
1179 }
1180
1181 return host;
1182}
1183
1184EXPORT_SYMBOL(mmc_alloc_host);
1185
1186/**
1187 * mmc_add_host - initialise host hardware
1188 * @host: mmc host
1189 */
1190int mmc_add_host(struct mmc_host *host)
1191{
00b137cf 1192 int ret;
1da177e4 1193
00b137cf
RK		 1194 ret = mmc_add_host_sysfs(host);
1195 if (ret == 0) {
1196 mmc_power_off(host);
8dc00335 1197 mmc_detect_change(host, 0);
00b137cf 1198 }
1da177e4 1199
00b137cf 1200 return ret;
1da177e4
LT		 1201}
1202
1203EXPORT_SYMBOL(mmc_add_host);
1204
1205/**
1206 * mmc_remove_host - remove host hardware
1207 * @host: mmc host
1208 *
1209 * Unregister and remove all cards associated with this host,
1210 * and power down the MMC bus.
1211 */
1212void mmc_remove_host(struct mmc_host *host)
1213{
1214 struct list_head *l, *n;
1215
1216 list_for_each_safe(l, n, &host->cards) {
1217 struct mmc_card *card = mmc_list_to_card(l);
1218
1219 mmc_remove_card(card);
1220 }
1221
1222 mmc_power_off(host);
00b137cf 1223 mmc_remove_host_sysfs(host);
1da177e4
LT		 1224}
1225
1226EXPORT_SYMBOL(mmc_remove_host);
1227
1228/**
1229 * mmc_free_host - free the host structure
1230 * @host: mmc host
1231 *
1232 * Free the host once all references to it have been dropped.
1233 */
1234void mmc_free_host(struct mmc_host *host)
1235{
1236 flush_scheduled_work();
00b137cf 1237 mmc_free_host_sysfs(host);
1da177e4
LT		 1238}
1239
1240EXPORT_SYMBOL(mmc_free_host);
1241
1242#ifdef CONFIG_PM
1243
1244/**
1245 * mmc_suspend_host - suspend a host
1246 * @host: mmc host
1247 * @state: suspend mode (PM_SUSPEND_xxx)
1248 */
e5378ca8 1249int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
1da177e4
LT		 1250{
1251 mmc_claim_host(host);
1252 mmc_deselect_cards(host);
1253 mmc_power_off(host);
1254 mmc_release_host(host);
1255
1256 return 0;
1257}
1258
1259EXPORT_SYMBOL(mmc_suspend_host);
1260
1261/**
1262 * mmc_resume_host - resume a previously suspended host
1263 * @host: mmc host
1264 */
1265int mmc_resume_host(struct mmc_host *host)
1266{
896937ad 1267 mmc_rescan(host);
1da177e4
LT		 1268
1269 return 0;
1270}
1271
1272EXPORT_SYMBOL(mmc_resume_host);
1273
1274#endif
1275
1276MODULE_LICENSE("GPL");
Clone of davem's net-next-2.6 tree