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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.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#include <linux/config.h>
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/interrupt.h>
14#include <linux/completion.h>
15#include <linux/device.h>
16#include <linux/delay.h>
17#include <linux/pagemap.h>
18#include <linux/err.h>
19
20#include <linux/mmc/card.h>
21#include <linux/mmc/host.h>
22#include <linux/mmc/protocol.h>
23
24#include "mmc.h"
25
26#ifdef CONFIG_MMC_DEBUG
27#define DBG(x...) printk(KERN_DEBUG x)
28#else
29#define DBG(x...) do { } while (0)
30#endif
31
32#define CMD_RETRIES 3
33
34/*
35 * OCR Bit positions to 10s of Vdd mV.
36 */
37static const unsigned short mmc_ocr_bit_to_vdd[] = {
38 150, 155, 160, 165, 170, 180, 190, 200,
39 210, 220, 230, 240, 250, 260, 270, 280,
40 290, 300, 310, 320, 330, 340, 350, 360
41};
42
43static const unsigned int tran_exp[] = {
44 10000, 100000, 1000000, 10000000,
45 0, 0, 0, 0
46};
47
48static const unsigned char tran_mant[] = {
49 0, 10, 12, 13, 15, 20, 25, 30,
50 35, 40, 45, 50, 55, 60, 70, 80,
51};
52
53static const unsigned int tacc_exp[] = {
54 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
55};
56
57static const unsigned int tacc_mant[] = {
58 0, 10, 12, 13, 15, 20, 25, 30,
59 35, 40, 45, 50, 55, 60, 70, 80,
60};
61
62
63/**
64 * mmc_request_done - finish processing an MMC command
65 * @host: MMC host which completed command
66 * @mrq: MMC request which completed
67 *
68 * MMC drivers should call this function when they have completed
69 * their processing of a command. This should be called before the
70 * data part of the command has completed.
71 */
72void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
73{
74 struct mmc_command *cmd = mrq->cmd;
75 int err = mrq->cmd->error;
76 DBG("MMC: req done (%02x): %d: %08x %08x %08x %08x\n", cmd->opcode,
77 err, cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]);
78
79 if (err && cmd->retries) {
80 cmd->retries--;
81 cmd->error = 0;
82 host->ops->request(host, mrq);
83 } else if (mrq->done) {
84 mrq->done(mrq);
85 }
86}
87
88EXPORT_SYMBOL(mmc_request_done);
89
90/**
91 * mmc_start_request - start a command on a host
92 * @host: MMC host to start command on
93 * @mrq: MMC request to start
94 *
95 * Queue a command on the specified host. We expect the
96 * caller to be holding the host lock with interrupts disabled.
97 */
98void
99mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
100{
101 DBG("MMC: starting cmd %02x arg %08x flags %08x\n",
102 mrq->cmd->opcode, mrq->cmd->arg, mrq->cmd->flags);
103
104 WARN_ON(host->card_busy == NULL);
105
106 mrq->cmd->error = 0;
107 mrq->cmd->mrq = mrq;
108 if (mrq->data) {
109 mrq->cmd->data = mrq->data;
110 mrq->data->error = 0;
111 mrq->data->mrq = mrq;
112 if (mrq->stop) {
113 mrq->data->stop = mrq->stop;
114 mrq->stop->error = 0;
115 mrq->stop->mrq = mrq;
116 }
117 }
118 host->ops->request(host, mrq);
119}
120
121EXPORT_SYMBOL(mmc_start_request);
122
123static void mmc_wait_done(struct mmc_request *mrq)
124{
125 complete(mrq->done_data);
126}
127
128int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
129{
130 DECLARE_COMPLETION(complete);
131
132 mrq->done_data = &complete;
133 mrq->done = mmc_wait_done;
134
135 mmc_start_request(host, mrq);
136
137 wait_for_completion(&complete);
138
139 return 0;
140}
141
142EXPORT_SYMBOL(mmc_wait_for_req);
143
144/**
145 * mmc_wait_for_cmd - start a command and wait for completion
146 * @host: MMC host to start command
147 * @cmd: MMC command to start
148 * @retries: maximum number of retries
149 *
150 * Start a new MMC command for a host, and wait for the command
151 * to complete. Return any error that occurred while the command
152 * was executing. Do not attempt to parse the response.
153 */
154int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
155{
156 struct mmc_request mrq;
157
158 BUG_ON(host->card_busy == NULL);
159
160 memset(&mrq, 0, sizeof(struct mmc_request));
161
162 memset(cmd->resp, 0, sizeof(cmd->resp));
163 cmd->retries = retries;
164
165 mrq.cmd = cmd;
166 cmd->data = NULL;
167
168 mmc_wait_for_req(host, &mrq);
169
170 return cmd->error;
171}
172
173EXPORT_SYMBOL(mmc_wait_for_cmd);
174
335eadf2
PO		 175/**
176 * mmc_wait_for_app_cmd - start an application command and wait for
177 completion
178 * @host: MMC host to start command
179 * @rca: RCA to send MMC_APP_CMD to
180 * @cmd: MMC command to start
181 * @retries: maximum number of retries
182 *
183 * Sends a MMC_APP_CMD, checks the card response, sends the command
184 * in the parameter and waits for it to complete. Return any error
185 * that occurred while the command was executing. Do not attempt to
186 * parse the response.
187 */
188int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca,
189 struct mmc_command *cmd, int retries)
190{
191 struct mmc_request mrq;
192 struct mmc_command appcmd;
193
194 int i, err;
195
196 BUG_ON(host->card_busy == NULL);
197 BUG_ON(retries < 0);
198
199 err = MMC_ERR_INVALID;
200
201 /*
202 * We have to resend MMC_APP_CMD for each attempt so
203 * we cannot use the retries field in mmc_command.
204 */
205 for (i = 0;i <= retries;i++) {
206 memset(&mrq, 0, sizeof(struct mmc_request));
207
208 appcmd.opcode = MMC_APP_CMD;
209 appcmd.arg = rca << 16;
210 appcmd.flags = MMC_RSP_R1;
211 appcmd.retries = 0;
212 memset(appcmd.resp, 0, sizeof(appcmd.resp));
213 appcmd.data = NULL;
214
215 mrq.cmd = &appcmd;
216 appcmd.data = NULL;
217
218 mmc_wait_for_req(host, &mrq);
219
220 if (appcmd.error) {
221 err = appcmd.error;
222 continue;
223 }
224
225 /* Check that card supported application commands */
226 if (!(appcmd.resp[0] & R1_APP_CMD))
227 return MMC_ERR_FAILED;
228
229 memset(&mrq, 0, sizeof(struct mmc_request));
230
231 memset(cmd->resp, 0, sizeof(cmd->resp));
232 cmd->retries = 0;
233
234 mrq.cmd = cmd;
235 cmd->data = NULL;
1da177e4 236
335eadf2
PO		 237 mmc_wait_for_req(host, &mrq);
238
239 err = cmd->error;
240 if (cmd->error == MMC_ERR_NONE)
241 break;
242 }
243
244 return err;
245}
246
247EXPORT_SYMBOL(mmc_wait_for_app_cmd);
1da177e4
LT		 248
249/**
250 * __mmc_claim_host - exclusively claim a host
251 * @host: mmc host to claim
252 * @card: mmc card to claim host for
253 *
254 * Claim a host for a set of operations. If a valid card
255 * is passed and this wasn't the last card selected, select
256 * the card before returning.
257 *
258 * Note: you should use mmc_card_claim_host or mmc_claim_host.
259 */
260int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card)
261{
262 DECLARE_WAITQUEUE(wait, current);
263 unsigned long flags;
264 int err = 0;
265
266 add_wait_queue(&host->wq, &wait);
267 spin_lock_irqsave(&host->lock, flags);
268 while (1) {
269 set_current_state(TASK_UNINTERRUPTIBLE);
270 if (host->card_busy == NULL)
271 break;
272 spin_unlock_irqrestore(&host->lock, flags);
273 schedule();
274 spin_lock_irqsave(&host->lock, flags);
275 }
276 set_current_state(TASK_RUNNING);
277 host->card_busy = card;
278 spin_unlock_irqrestore(&host->lock, flags);
279 remove_wait_queue(&host->wq, &wait);
280
281 if (card != (void *)-1 && host->card_selected != card) {
282 struct mmc_command cmd;
283
284 host->card_selected = card;
285
286 cmd.opcode = MMC_SELECT_CARD;
287 cmd.arg = card->rca << 16;
288 cmd.flags = MMC_RSP_R1;
289
290 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
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
320/*
321 * Ensure that no card is selected.
322 */
323static void mmc_deselect_cards(struct mmc_host *host)
324{
325 struct mmc_command cmd;
326
327 if (host->card_selected) {
328 host->card_selected = NULL;
329
330 cmd.opcode = MMC_SELECT_CARD;
331 cmd.arg = 0;
332 cmd.flags = MMC_RSP_NONE;
333
334 mmc_wait_for_cmd(host, &cmd, 0);
335 }
336}
337
338
339static inline void mmc_delay(unsigned int ms)
340{
341 if (ms < HZ / 1000) {
342 yield();
343 mdelay(ms);
344 } else {
345 msleep_interruptible (ms);
346 }
347}
348
349/*
350 * Mask off any voltages we don't support and select
351 * the lowest voltage
352 */
353static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
354{
355 int bit;
356
357 ocr &= host->ocr_avail;
358
359 bit = ffs(ocr);
360 if (bit) {
361 bit -= 1;
362
363 ocr = 3 << bit;
364
365 host->ios.vdd = bit;
366 host->ops->set_ios(host, &host->ios);
367 } else {
368 ocr = 0;
369 }
370
371 return ocr;
372}
373
374#define UNSTUFF_BITS(resp,start,size) \
375 ({ \
376 const int __size = size; \
377 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
378 const int __off = 3 - ((start) / 32); \
379 const int __shft = (start) & 31; \
380 u32 __res; \
381 \
382 __res = resp[__off] >> __shft; \
383 if (__size + __shft > 32) \
384 __res |= resp[__off-1] << ((32 - __shft) % 32); \
385 __res & __mask; \
386 })
387
388/*
389 * Given the decoded CSD structure, decode the raw CID to our CID structure.
390 */
391static void mmc_decode_cid(struct mmc_card *card)
392{
393 u32 *resp = card->raw_cid;
394
395 memset(&card->cid, 0, sizeof(struct mmc_cid));
396
335eadf2
PO		 397 if (mmc_card_sd(card)) {
398 /*
399 * SD doesn't currently have a version field so we will
400 * have to assume we can parse this.
401 */
402 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
403 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
404 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
405 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
406 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
407 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
408 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
409 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
410 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
411 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
412 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
413 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
414
415 card->cid.year += 2000; /* SD cards year offset */
a00fc090 416 } else {
335eadf2
PO		 417 /*
418 * The selection of the format here is based upon published
419 * specs from sandisk and from what people have reported.
420 */
421 switch (card->csd.mmca_vsn) {
422 case 0: /* MMC v1.0 - v1.2 */
423 case 1: /* MMC v1.4 */
424 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
425 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
426 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
427 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
428 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
429 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
430 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
431 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
432 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
433 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
434 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
435 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
436 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
437 break;
438
439 case 2: /* MMC v2.0 - v2.2 */
440 case 3: /* MMC v3.1 - v3.3 */
441 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
442 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
443 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
444 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
445 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
446 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
447 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
448 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
449 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
450 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
451 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
452 break;
453
454 default:
455 printk("%s: card has unknown MMCA version %d\n",
456 mmc_hostname(card->host), card->csd.mmca_vsn);
457 mmc_card_set_bad(card);
458 break;
459 }
1da177e4
LT		 460 }
461}
462
463/*
464 * Given a 128-bit response, decode to our card CSD structure.
465 */
466static void mmc_decode_csd(struct mmc_card *card)
467{
468 struct mmc_csd *csd = &card->csd;
469 unsigned int e, m, csd_struct;
470 u32 *resp = card->raw_csd;
471
335eadf2
PO		 472 if (mmc_card_sd(card)) {
473 csd_struct = UNSTUFF_BITS(resp, 126, 2);
474 if (csd_struct != 0) {
475 printk("%s: unrecognised CSD structure version %d\n",
476 mmc_hostname(card->host), csd_struct);
477 mmc_card_set_bad(card);
478 return;
479 }
480
481 m = UNSTUFF_BITS(resp, 115, 4);
482 e = UNSTUFF_BITS(resp, 112, 3);
483 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
484 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
485
486 m = UNSTUFF_BITS(resp, 99, 4);
487 e = UNSTUFF_BITS(resp, 96, 3);
488 csd->max_dtr = tran_exp[e] * tran_mant[m];
489 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
490
491 e = UNSTUFF_BITS(resp, 47, 3);
492 m = UNSTUFF_BITS(resp, 62, 12);
493 csd->capacity = (1 + m) << (e + 2);
494
495 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
a00fc090 496 } else {
335eadf2
PO		 497 /*
498 * We only understand CSD structure v1.1 and v1.2.
499 * v1.2 has extra information in bits 15, 11 and 10.
500 */
501 csd_struct = UNSTUFF_BITS(resp, 126, 2);
502 if (csd_struct != 1 && csd_struct != 2) {
503 printk("%s: unrecognised CSD structure version %d\n",
504 mmc_hostname(card->host), csd_struct);
505 mmc_card_set_bad(card);
506 return;
507 }
1da177e4 508
335eadf2
PO		 509 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
510 m = UNSTUFF_BITS(resp, 115, 4);
511 e = UNSTUFF_BITS(resp, 112, 3);
512 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
513 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
1da177e4 514
335eadf2
PO		 515 m = UNSTUFF_BITS(resp, 99, 4);
516 e = UNSTUFF_BITS(resp, 96, 3);
517 csd->max_dtr = tran_exp[e] * tran_mant[m];
518 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
1da177e4 519
335eadf2
PO		 520 e = UNSTUFF_BITS(resp, 47, 3);
521 m = UNSTUFF_BITS(resp, 62, 12);
522 csd->capacity = (1 + m) << (e + 2);
1da177e4 523
335eadf2
PO		 524 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
525 }
1da177e4
LT		 526}
527
528/*
529 * Locate a MMC card on this MMC host given a raw CID.
530 */
531static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid)
532{
533 struct mmc_card *card;
534
535 list_for_each_entry(card, &host->cards, node) {
536 if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0)
537 return card;
538 }
539 return NULL;
540}
541
542/*
543 * Allocate a new MMC card, and assign a unique RCA.
544 */
545static struct mmc_card *
546mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca)
547{
548 struct mmc_card *card, *c;
549 unsigned int rca = *frca;
550
551 card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL);
552 if (!card)
553 return ERR_PTR(-ENOMEM);
554
555 mmc_init_card(card, host);
556 memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid));
557
558 again:
559 list_for_each_entry(c, &host->cards, node)
560 if (c->rca == rca) {
561 rca++;
562 goto again;
563 }
564
565 card->rca = rca;
566
567 *frca = rca;
568
569 return card;
570}
571
572/*
573 * Tell attached cards to go to IDLE state
574 */
575static void mmc_idle_cards(struct mmc_host *host)
576{
577 struct mmc_command cmd;
578
865e9f13
PO		 579 host->ios.chip_select = MMC_CS_HIGH;
580 host->ops->set_ios(host, &host->ios);
581
582 mmc_delay(1);
583
1da177e4
LT		 584 cmd.opcode = MMC_GO_IDLE_STATE;
585 cmd.arg = 0;
586 cmd.flags = MMC_RSP_NONE;
587
588 mmc_wait_for_cmd(host, &cmd, 0);
589
590 mmc_delay(1);
865e9f13
PO		 591
592 host->ios.chip_select = MMC_CS_DONTCARE;
593 host->ops->set_ios(host, &host->ios);
594
595 mmc_delay(1);
1da177e4
LT		 596}
597
598/*
599 * Apply power to the MMC stack.
600 */
601static void mmc_power_up(struct mmc_host *host)
602{
603 int bit = fls(host->ocr_avail) - 1;
604
605 host->ios.vdd = bit;
606 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
865e9f13 607 host->ios.chip_select = MMC_CS_DONTCARE;
1da177e4
LT		 608 host->ios.power_mode = MMC_POWER_UP;
609 host->ops->set_ios(host, &host->ios);
610
611 mmc_delay(1);
612
613 host->ios.clock = host->f_min;
614 host->ios.power_mode = MMC_POWER_ON;
615 host->ops->set_ios(host, &host->ios);
616
617 mmc_delay(2);
618}
619
620static void mmc_power_off(struct mmc_host *host)
621{
622 host->ios.clock = 0;
623 host->ios.vdd = 0;
624 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
865e9f13 625 host->ios.chip_select = MMC_CS_DONTCARE;
1da177e4
LT		 626 host->ios.power_mode = MMC_POWER_OFF;
627 host->ops->set_ios(host, &host->ios);
628}
629
630static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
631{
632 struct mmc_command cmd;
633 int i, err = 0;
634
635 cmd.opcode = MMC_SEND_OP_COND;
636 cmd.arg = ocr;
637 cmd.flags = MMC_RSP_R3;
638
639 for (i = 100; i; i--) {
640 err = mmc_wait_for_cmd(host, &cmd, 0);
641 if (err != MMC_ERR_NONE)
642 break;
643
644 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
645 break;
646
647 err = MMC_ERR_TIMEOUT;
648
649 mmc_delay(10);
650 }
651
652 if (rocr)
653 *rocr = cmd.resp[0];
654
655 return err;
656}
657
335eadf2
PO		 658static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
659{
660 struct mmc_command cmd;
661 int i, err = 0;
662
663 cmd.opcode = SD_APP_OP_COND;
664 cmd.arg = ocr;
665 cmd.flags = MMC_RSP_R3;
666
667 for (i = 100; i; i--) {
668 err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES);
669 if (err != MMC_ERR_NONE)
670 break;
671
672 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
673 break;
674
675 err = MMC_ERR_TIMEOUT;
676
677 mmc_delay(10);
678 }
679
680 if (rocr)
681 *rocr = cmd.resp[0];
682
683 return err;
684}
685
1da177e4
LT		 686/*
687 * Discover cards by requesting their CID. If this command
688 * times out, it is not an error; there are no further cards
689 * to be discovered. Add new cards to the list.
690 *
691 * Create a mmc_card entry for each discovered card, assigning
692 * it an RCA, and save the raw CID for decoding later.
693 */
694static void mmc_discover_cards(struct mmc_host *host)
695{
696 struct mmc_card *card;
697 unsigned int first_rca = 1, err;
698
699 while (1) {
700 struct mmc_command cmd;
701
702 cmd.opcode = MMC_ALL_SEND_CID;
703 cmd.arg = 0;
704 cmd.flags = MMC_RSP_R2;
705
706 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
707 if (err == MMC_ERR_TIMEOUT) {
708 err = MMC_ERR_NONE;
709 break;
710 }
711 if (err != MMC_ERR_NONE) {
712 printk(KERN_ERR "%s: error requesting CID: %d\n",
d366b643 713 mmc_hostname(host), err);
1da177e4
LT		 714 break;
715 }
716
717 card = mmc_find_card(host, cmd.resp);
718 if (!card) {
719 card = mmc_alloc_card(host, cmd.resp, &first_rca);
720 if (IS_ERR(card)) {
721 err = PTR_ERR(card);
722 break;
723 }
724 list_add(&card->node, &host->cards);
725 }
726
727 card->state &= ~MMC_STATE_DEAD;
728
335eadf2
PO		 729 if (host->mode == MMC_MODE_SD) {
730 mmc_card_set_sd(card);
1da177e4 731
335eadf2
PO		 732 cmd.opcode = SD_SEND_RELATIVE_ADDR;
733 cmd.arg = 0;
734 cmd.flags = MMC_RSP_R1;
735
736 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
737 if (err != MMC_ERR_NONE)
738 mmc_card_set_dead(card);
a00fc090 739 else {
335eadf2 740 card->rca = cmd.resp[0] >> 16;
a00fc090
PO		 741
742 if (!host->ops->get_ro) {
743 printk(KERN_WARNING "%s: host does not "
744 "support reading read-only "
745 "switch. assuming write-enable.\n",
746 mmc_hostname(host));
747 } else {
748 if (host->ops->get_ro(host))
749 mmc_card_set_readonly(card);
750 }
751 }
752 } else {
335eadf2
PO		 753 cmd.opcode = MMC_SET_RELATIVE_ADDR;
754 cmd.arg = card->rca << 16;
755 cmd.flags = MMC_RSP_R1;
756
757 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
758 if (err != MMC_ERR_NONE)
759 mmc_card_set_dead(card);
760 }
1da177e4
LT		 761 }
762}
763
764static void mmc_read_csds(struct mmc_host *host)
765{
766 struct mmc_card *card;
767
768 list_for_each_entry(card, &host->cards, node) {
769 struct mmc_command cmd;
770 int err;
771
772 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
773 continue;
774
775 cmd.opcode = MMC_SEND_CSD;
776 cmd.arg = card->rca << 16;
777 cmd.flags = MMC_RSP_R2;
778
779 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
780 if (err != MMC_ERR_NONE) {
781 mmc_card_set_dead(card);
782 continue;
783 }
784
785 memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd));
786
787 mmc_decode_csd(card);
788 mmc_decode_cid(card);
789 }
790}
791
792static unsigned int mmc_calculate_clock(struct mmc_host *host)
793{
794 struct mmc_card *card;
795 unsigned int max_dtr = host->f_max;
796
797 list_for_each_entry(card, &host->cards, node)
798 if (!mmc_card_dead(card) && max_dtr > card->csd.max_dtr)
799 max_dtr = card->csd.max_dtr;
800
801 DBG("MMC: selected %d.%03dMHz transfer rate\n",
802 max_dtr / 1000000, (max_dtr / 1000) % 1000);
803
804 return max_dtr;
805}
806
807/*
808 * Check whether cards we already know about are still present.
809 * We do this by requesting status, and checking whether a card
810 * responds.
811 *
812 * A request for status does not cause a state change in data
813 * transfer mode.
814 */
815static void mmc_check_cards(struct mmc_host *host)
816{
817 struct list_head *l, *n;
818
819 mmc_deselect_cards(host);
820
821 list_for_each_safe(l, n, &host->cards) {
822 struct mmc_card *card = mmc_list_to_card(l);
823 struct mmc_command cmd;
824 int err;
825
826 cmd.opcode = MMC_SEND_STATUS;
827 cmd.arg = card->rca << 16;
828 cmd.flags = MMC_RSP_R1;
829
830 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
831 if (err == MMC_ERR_NONE)
832 continue;
833
834 mmc_card_set_dead(card);
835 }
836}
837
838static void mmc_setup(struct mmc_host *host)
839{
840 if (host->ios.power_mode != MMC_POWER_ON) {
841 int err;
842 u32 ocr;
843
a00fc090 844 host->mode = MMC_MODE_SD;
335eadf2 845
1da177e4
LT		 846 mmc_power_up(host);
847 mmc_idle_cards(host);
848
a00fc090 849 err = mmc_send_app_op_cond(host, 0, &ocr);
335eadf2
PO		 850
851 /*
a00fc090
PO		 852 * If we fail to detect any SD cards then try
853 * searching for MMC cards.
335eadf2 854 */
a00fc090
PO		 855 if (err != MMC_ERR_NONE) {
856 host->mode = MMC_MODE_MMC;
857
858 err = mmc_send_op_cond(host, 0, &ocr);
335eadf2
PO		 859 if (err != MMC_ERR_NONE)
860 return;
335eadf2 861 }
1da177e4
LT		 862
863 host->ocr = mmc_select_voltage(host, ocr);
864
865 /*
866 * Since we're changing the OCR value, we seem to
867 * need to tell some cards to go back to the idle
868 * state. We wait 1ms to give cards time to
869 * respond.
870 */
871 if (host->ocr)
872 mmc_idle_cards(host);
873 } else {
874 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
875 host->ios.clock = host->f_min;
876 host->ops->set_ios(host, &host->ios);
877
878 /*
879 * We should remember the OCR mask from the existing
880 * cards, and detect the new cards OCR mask, combine
881 * the two and re-select the VDD. However, if we do
882 * change VDD, we should do an idle, and then do a
883 * full re-initialisation. We would need to notify
884 * drivers so that they can re-setup the cards as
885 * well, while keeping their queues at bay.
886 *
887 * For the moment, we take the easy way out - if the
888 * new cards don't like our currently selected VDD,
889 * they drop off the bus.
890 */
891 }
892
893 if (host->ocr == 0)
894 return;
895
896 /*
897 * Send the selected OCR multiple times... until the cards
898 * all get the idea that they should be ready for CMD2.
899 * (My SanDisk card seems to need this.)
900 */
335eadf2
PO		 901 if (host->mode == MMC_MODE_SD)
902 mmc_send_app_op_cond(host, host->ocr, NULL);
903 else
904 mmc_send_op_cond(host, host->ocr, NULL);
1da177e4
LT		 905
906 mmc_discover_cards(host);
907
908 /*
909 * Ok, now switch to push-pull mode.
910 */
911 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
912 host->ops->set_ios(host, &host->ios);
913
914 mmc_read_csds(host);
915}
916
917
918/**
919 * mmc_detect_change - process change of state on a MMC socket
920 * @host: host which changed state.
921 *
922 * All we know is that card(s) have been inserted or removed
923 * from the socket(s). We don't know which socket or cards.
924 */
925void mmc_detect_change(struct mmc_host *host)
926{
927 schedule_work(&host->detect);
928}
929
930EXPORT_SYMBOL(mmc_detect_change);
931
932
933static void mmc_rescan(void *data)
934{
935 struct mmc_host *host = data;
936 struct list_head *l, *n;
937
938 mmc_claim_host(host);
939
940 if (host->ios.power_mode == MMC_POWER_ON)
941 mmc_check_cards(host);
942
943 mmc_setup(host);
944
945 if (!list_empty(&host->cards)) {
946 /*
947 * (Re-)calculate the fastest clock rate which the
948 * attached cards and the host support.
949 */
950 host->ios.clock = mmc_calculate_clock(host);
951 host->ops->set_ios(host, &host->ios);
952 }
953
954 mmc_release_host(host);
955
956 list_for_each_safe(l, n, &host->cards) {
957 struct mmc_card *card = mmc_list_to_card(l);
958
959 /*
960 * If this is a new and good card, register it.
961 */
962 if (!mmc_card_present(card) && !mmc_card_dead(card)) {
963 if (mmc_register_card(card))
964 mmc_card_set_dead(card);
965 else
966 mmc_card_set_present(card);
967 }
968
969 /*
970 * If this card is dead, destroy it.
971 */
972 if (mmc_card_dead(card)) {
973 list_del(&card->node);
974 mmc_remove_card(card);
975 }
976 }
977
978 /*
979 * If we discover that there are no cards on the
980 * bus, turn off the clock and power down.
981 */
982 if (list_empty(&host->cards))
983 mmc_power_off(host);
984}
985
986
987/**
988 * mmc_alloc_host - initialise the per-host structure.
989 * @extra: sizeof private data structure
990 * @dev: pointer to host device model structure
991 *
992 * Initialise the per-host structure.
993 */
994struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
995{
996 struct mmc_host *host;
997
00b137cf 998 host = mmc_alloc_host_sysfs(extra, dev);
1da177e4 999 if (host) {
1da177e4
LT		 1000 spin_lock_init(&host->lock);
1001 init_waitqueue_head(&host->wq);
1002 INIT_LIST_HEAD(&host->cards);
1003 INIT_WORK(&host->detect, mmc_rescan, host);
1004
1da177e4
LT		 1005 /*
1006 * By default, hosts do not support SGIO or large requests.
1007 * They have to set these according to their abilities.
1008 */
1009 host->max_hw_segs = 1;
1010 host->max_phys_segs = 1;
1011 host->max_sectors = 1 << (PAGE_CACHE_SHIFT - 9);
1012 host->max_seg_size = PAGE_CACHE_SIZE;
1013 }
1014
1015 return host;
1016}
1017
1018EXPORT_SYMBOL(mmc_alloc_host);
1019
1020/**
1021 * mmc_add_host - initialise host hardware
1022 * @host: mmc host
1023 */
1024int mmc_add_host(struct mmc_host *host)
1025{
00b137cf 1026 int ret;
1da177e4 1027
00b137cf
RK		 1028 ret = mmc_add_host_sysfs(host);
1029 if (ret == 0) {
1030 mmc_power_off(host);
1031 mmc_detect_change(host);
1032 }
1da177e4 1033
00b137cf 1034 return ret;
1da177e4
LT		 1035}
1036
1037EXPORT_SYMBOL(mmc_add_host);
1038
1039/**
1040 * mmc_remove_host - remove host hardware
1041 * @host: mmc host
1042 *
1043 * Unregister and remove all cards associated with this host,
1044 * and power down the MMC bus.
1045 */
1046void mmc_remove_host(struct mmc_host *host)
1047{
1048 struct list_head *l, *n;
1049
1050 list_for_each_safe(l, n, &host->cards) {
1051 struct mmc_card *card = mmc_list_to_card(l);
1052
1053 mmc_remove_card(card);
1054 }
1055
1056 mmc_power_off(host);
00b137cf 1057 mmc_remove_host_sysfs(host);
1da177e4
LT		 1058}
1059
1060EXPORT_SYMBOL(mmc_remove_host);
1061
1062/**
1063 * mmc_free_host - free the host structure
1064 * @host: mmc host
1065 *
1066 * Free the host once all references to it have been dropped.
1067 */
1068void mmc_free_host(struct mmc_host *host)
1069{
1070 flush_scheduled_work();
00b137cf 1071 mmc_free_host_sysfs(host);
1da177e4
LT		 1072}
1073
1074EXPORT_SYMBOL(mmc_free_host);
1075
1076#ifdef CONFIG_PM
1077
1078/**
1079 * mmc_suspend_host - suspend a host
1080 * @host: mmc host
1081 * @state: suspend mode (PM_SUSPEND_xxx)
1082 */
e5378ca8 1083int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
1da177e4
LT		 1084{
1085 mmc_claim_host(host);
1086 mmc_deselect_cards(host);
1087 mmc_power_off(host);
1088 mmc_release_host(host);
1089
1090 return 0;
1091}
1092
1093EXPORT_SYMBOL(mmc_suspend_host);
1094
1095/**
1096 * mmc_resume_host - resume a previously suspended host
1097 * @host: mmc host
1098 */
1099int mmc_resume_host(struct mmc_host *host)
1100{
1101 mmc_detect_change(host);
1102
1103 return 0;
1104}
1105
1106EXPORT_SYMBOL(mmc_resume_host);
1107
1108#endif
1109
1110MODULE_LICENSE("GPL");
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