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[PATCH] UFS: inode->i_sem is not released in error path
[linux-2.6/verdex.git] / drivers / mmc / mmc.c
blob6696f71363b92bc3c2744b3bd3ffe243ec2f1714
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 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
554 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
555 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
556 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
557 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
558 } else {
559 /*
560 * We only understand CSD structure v1.1 and v1.2.
561 * v1.2 has extra information in bits 15, 11 and 10.
562 */
563 csd_struct = UNSTUFF_BITS(resp, 126, 2);
564 if (csd_struct != 1 && csd_struct != 2) {
565 printk("%s: unrecognised CSD structure version %d\n",
566 mmc_hostname(card->host), csd_struct);
567 mmc_card_set_bad(card);
568 return;
569 }
570
571 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
572 m = UNSTUFF_BITS(resp, 115, 4);
573 e = UNSTUFF_BITS(resp, 112, 3);
574 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
575 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
576
577 m = UNSTUFF_BITS(resp, 99, 4);
578 e = UNSTUFF_BITS(resp, 96, 3);
579 csd->max_dtr = tran_exp[e] * tran_mant[m];
580 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
581
582 e = UNSTUFF_BITS(resp, 47, 3);
583 m = UNSTUFF_BITS(resp, 62, 12);
584 csd->capacity = (1 + m) << (e + 2);
585
586 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
587 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
588 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
589 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
590 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
591 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
592 }
593 }
594
595 /*
596 * Given a 64-bit response, decode to our card SCR structure.
597 */
598 static void mmc_decode_scr(struct mmc_card *card)
599 {
600 struct sd_scr *scr = &card->scr;
601 unsigned int scr_struct;
602 u32 resp[4];
603
604 BUG_ON(!mmc_card_sd(card));
605
606 resp[3] = card->raw_scr[1];
607 resp[2] = card->raw_scr[0];
608
609 scr_struct = UNSTUFF_BITS(resp, 60, 4);
610 if (scr_struct != 0) {
611 printk("%s: unrecognised SCR structure version %d\n",
612 mmc_hostname(card->host), scr_struct);
613 mmc_card_set_bad(card);
614 return;
615 }
616
617 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
618 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
619 }
620
621 /*
622 * Locate a MMC card on this MMC host given a raw CID.
623 */
624 static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid)
625 {
626 struct mmc_card *card;
627
628 list_for_each_entry(card, &host->cards, node) {
629 if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0)
630 return card;
631 }
632 return NULL;
633 }
634
635 /*
636 * Allocate a new MMC card, and assign a unique RCA.
637 */
638 static struct mmc_card *
639 mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca)
640 {
641 struct mmc_card *card, *c;
642 unsigned int rca = *frca;
643
644 card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL);
645 if (!card)
646 return ERR_PTR(-ENOMEM);
647
648 mmc_init_card(card, host);
649 memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid));
650
651 again:
652 list_for_each_entry(c, &host->cards, node)
653 if (c->rca == rca) {
654 rca++;
655 goto again;
656 }
657
658 card->rca = rca;
659
660 *frca = rca;
661
662 return card;
663 }
664
665 /*
666 * Tell attached cards to go to IDLE state
667 */
668 static void mmc_idle_cards(struct mmc_host *host)
669 {
670 struct mmc_command cmd;
671
672 host->ios.chip_select = MMC_CS_HIGH;
673 host->ops->set_ios(host, &host->ios);
674
675 mmc_delay(1);
676
677 cmd.opcode = MMC_GO_IDLE_STATE;
678 cmd.arg = 0;
679 cmd.flags = MMC_RSP_NONE;
680
681 mmc_wait_for_cmd(host, &cmd, 0);
682
683 mmc_delay(1);
684
685 host->ios.chip_select = MMC_CS_DONTCARE;
686 host->ops->set_ios(host, &host->ios);
687
688 mmc_delay(1);
689 }
690
691 /*
692 * Apply power to the MMC stack. This is a two-stage process.
693 * First, we enable power to the card without the clock running.
694 * We then wait a bit for the power to stabilise. Finally,
695 * enable the bus drivers and clock to the card.
696 *
697 * We must _NOT_ enable the clock prior to power stablising.
698 *
699 * If a host does all the power sequencing itself, ignore the
700 * initial MMC_POWER_UP stage.
701 */
702 static void mmc_power_up(struct mmc_host *host)
703 {
704 int bit = fls(host->ocr_avail) - 1;
705
706 host->ios.vdd = bit;
707 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
708 host->ios.chip_select = MMC_CS_DONTCARE;
709 host->ios.power_mode = MMC_POWER_UP;
710 host->ios.bus_width = MMC_BUS_WIDTH_1;
711 host->ops->set_ios(host, &host->ios);
712
713 mmc_delay(1);
714
715 host->ios.clock = host->f_min;
716 host->ios.power_mode = MMC_POWER_ON;
717 host->ops->set_ios(host, &host->ios);
718
719 mmc_delay(2);
720 }
721
722 static void mmc_power_off(struct mmc_host *host)
723 {
724 host->ios.clock = 0;
725 host->ios.vdd = 0;
726 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
727 host->ios.chip_select = MMC_CS_DONTCARE;
728 host->ios.power_mode = MMC_POWER_OFF;
729 host->ios.bus_width = MMC_BUS_WIDTH_1;
730 host->ops->set_ios(host, &host->ios);
731 }
732
733 static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
734 {
735 struct mmc_command cmd;
736 int i, err = 0;
737
738 cmd.opcode = MMC_SEND_OP_COND;
739 cmd.arg = ocr;
740 cmd.flags = MMC_RSP_R3;
741
742 for (i = 100; i; i--) {
743 err = mmc_wait_for_cmd(host, &cmd, 0);
744 if (err != MMC_ERR_NONE)
745 break;
746
747 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
748 break;
749
750 err = MMC_ERR_TIMEOUT;
751
752 mmc_delay(10);
753 }
754
755 if (rocr)
756 *rocr = cmd.resp[0];
757
758 return err;
759 }
760
761 static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
762 {
763 struct mmc_command cmd;
764 int i, err = 0;
765
766 cmd.opcode = SD_APP_OP_COND;
767 cmd.arg = ocr;
768 cmd.flags = MMC_RSP_R3;
769
770 for (i = 100; i; i--) {
771 err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES);
772 if (err != MMC_ERR_NONE)
773 break;
774
775 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
776 break;
777
778 err = MMC_ERR_TIMEOUT;
779
780 mmc_delay(10);
781 }
782
783 if (rocr)
784 *rocr = cmd.resp[0];
785
786 return err;
787 }
788
789 /*
790 * Discover cards by requesting their CID. If this command
791 * times out, it is not an error; there are no further cards
792 * to be discovered. Add new cards to the list.
793 *
794 * Create a mmc_card entry for each discovered card, assigning
795 * it an RCA, and save the raw CID for decoding later.
796 */
797 static void mmc_discover_cards(struct mmc_host *host)
798 {
799 struct mmc_card *card;
800 unsigned int first_rca = 1, err;
801
802 while (1) {
803 struct mmc_command cmd;
804
805 cmd.opcode = MMC_ALL_SEND_CID;
806 cmd.arg = 0;
807 cmd.flags = MMC_RSP_R2;
808
809 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
810 if (err == MMC_ERR_TIMEOUT) {
811 err = MMC_ERR_NONE;
812 break;
813 }
814 if (err != MMC_ERR_NONE) {
815 printk(KERN_ERR "%s: error requesting CID: %d\n",
816 mmc_hostname(host), err);
817 break;
818 }
819
820 card = mmc_find_card(host, cmd.resp);
821 if (!card) {
822 card = mmc_alloc_card(host, cmd.resp, &first_rca);
823 if (IS_ERR(card)) {
824 err = PTR_ERR(card);
825 break;
826 }
827 list_add(&card->node, &host->cards);
828 }
829
830 card->state &= ~MMC_STATE_DEAD;
831
832 if (host->mode == MMC_MODE_SD) {
833 mmc_card_set_sd(card);
834
835 cmd.opcode = SD_SEND_RELATIVE_ADDR;
836 cmd.arg = 0;
837 cmd.flags = MMC_RSP_R6;
838
839 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
840 if (err != MMC_ERR_NONE)
841 mmc_card_set_dead(card);
842 else {
843 card->rca = cmd.resp[0] >> 16;
844
845 if (!host->ops->get_ro) {
846 printk(KERN_WARNING "%s: host does not "
847 "support reading read-only "
848 "switch. assuming write-enable.\n",
849 mmc_hostname(host));
850 } else {
851 if (host->ops->get_ro(host))
852 mmc_card_set_readonly(card);
853 }
854 }
855 } else {
856 cmd.opcode = MMC_SET_RELATIVE_ADDR;
857 cmd.arg = card->rca << 16;
858 cmd.flags = MMC_RSP_R1;
859
860 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
861 if (err != MMC_ERR_NONE)
862 mmc_card_set_dead(card);
863 }
864 }
865 }
866
867 static void mmc_read_csds(struct mmc_host *host)
868 {
869 struct mmc_card *card;
870
871 list_for_each_entry(card, &host->cards, node) {
872 struct mmc_command cmd;
873 int err;
874
875 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
876 continue;
877
878 cmd.opcode = MMC_SEND_CSD;
879 cmd.arg = card->rca << 16;
880 cmd.flags = MMC_RSP_R2;
881
882 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
883 if (err != MMC_ERR_NONE) {
884 mmc_card_set_dead(card);
885 continue;
886 }
887
888 memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd));
889
890 mmc_decode_csd(card);
891 mmc_decode_cid(card);
892 }
893 }
894
895 static void mmc_read_scrs(struct mmc_host *host)
896 {
897 int err;
898 struct mmc_card *card;
899
900 struct mmc_request mrq;
901 struct mmc_command cmd;
902 struct mmc_data data;
903
904 struct scatterlist sg;
905
906 list_for_each_entry(card, &host->cards, node) {
907 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
908 continue;
909 if (!mmc_card_sd(card))
910 continue;
911
912 err = mmc_select_card(host, card);
913 if (err != MMC_ERR_NONE) {
914 mmc_card_set_dead(card);
915 continue;
916 }
917
918 memset(&cmd, 0, sizeof(struct mmc_command));
919
920 cmd.opcode = MMC_APP_CMD;
921 cmd.arg = card->rca << 16;
922 cmd.flags = MMC_RSP_R1;
923
924 err = mmc_wait_for_cmd(host, &cmd, 0);
925 if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) {
926 mmc_card_set_dead(card);
927 continue;
928 }
929
930 memset(&cmd, 0, sizeof(struct mmc_command));
931
932 cmd.opcode = SD_APP_SEND_SCR;
933 cmd.arg = 0;
934 cmd.flags = MMC_RSP_R1;
935
936 memset(&data, 0, sizeof(struct mmc_data));
937
938 data.timeout_ns = card->csd.tacc_ns * 10;
939 data.timeout_clks = card->csd.tacc_clks * 10;
940 data.blksz_bits = 3;
941 data.blocks = 1;
942 data.flags = MMC_DATA_READ;
943 data.sg = &sg;
944 data.sg_len = 1;
945
946 memset(&mrq, 0, sizeof(struct mmc_request));
947
948 mrq.cmd = &cmd;
949 mrq.data = &data;
950
951 sg_init_one(&sg, (u8*)card->raw_scr, 8);
952
953 mmc_wait_for_req(host, &mrq);
954
955 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
956 mmc_card_set_dead(card);
957 continue;
958 }
959
960 card->raw_scr[0] = ntohl(card->raw_scr[0]);
961 card->raw_scr[1] = ntohl(card->raw_scr[1]);
962
963 mmc_decode_scr(card);
964 }
965
966 mmc_deselect_cards(host);
967 }
968
969 static unsigned int mmc_calculate_clock(struct mmc_host *host)
970 {
971 struct mmc_card *card;
972 unsigned int max_dtr = host->f_max;
973
974 list_for_each_entry(card, &host->cards, node)
975 if (!mmc_card_dead(card) && max_dtr > card->csd.max_dtr)
976 max_dtr = card->csd.max_dtr;
977
978 DBG("MMC: selected %d.%03dMHz transfer rate\n",
979 max_dtr / 1000000, (max_dtr / 1000) % 1000);
980
981 return max_dtr;
982 }
983
984 /*
985 * Check whether cards we already know about are still present.
986 * We do this by requesting status, and checking whether a card
987 * responds.
988 *
989 * A request for status does not cause a state change in data
990 * transfer mode.
991 */
992 static void mmc_check_cards(struct mmc_host *host)
993 {
994 struct list_head *l, *n;
995
996 mmc_deselect_cards(host);
997
998 list_for_each_safe(l, n, &host->cards) {
999 struct mmc_card *card = mmc_list_to_card(l);
1000 struct mmc_command cmd;
1001 int err;
1002
1003 cmd.opcode = MMC_SEND_STATUS;
1004 cmd.arg = card->rca << 16;
1005 cmd.flags = MMC_RSP_R1;
1006
1007 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1008 if (err == MMC_ERR_NONE)
1009 continue;
1010
1011 mmc_card_set_dead(card);
1012 }
1013 }
1014
1015 static void mmc_setup(struct mmc_host *host)
1016 {
1017 if (host->ios.power_mode != MMC_POWER_ON) {
1018 int err;
1019 u32 ocr;
1020
1021 host->mode = MMC_MODE_SD;
1022
1023 mmc_power_up(host);
1024 mmc_idle_cards(host);
1025
1026 err = mmc_send_app_op_cond(host, 0, &ocr);
1027
1028 /*
1029 * If we fail to detect any SD cards then try
1030 * searching for MMC cards.
1031 */
1032 if (err != MMC_ERR_NONE) {
1033 host->mode = MMC_MODE_MMC;
1034
1035 err = mmc_send_op_cond(host, 0, &ocr);
1036 if (err != MMC_ERR_NONE)
1037 return;
1038 }
1039
1040 host->ocr = mmc_select_voltage(host, ocr);
1041
1042 /*
1043 * Since we're changing the OCR value, we seem to
1044 * need to tell some cards to go back to the idle
1045 * state. We wait 1ms to give cards time to
1046 * respond.
1047 */
1048 if (host->ocr)
1049 mmc_idle_cards(host);
1050 } else {
1051 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1052 host->ios.clock = host->f_min;
1053 host->ops->set_ios(host, &host->ios);
1054
1055 /*
1056 * We should remember the OCR mask from the existing
1057 * cards, and detect the new cards OCR mask, combine
1058 * the two and re-select the VDD. However, if we do
1059 * change VDD, we should do an idle, and then do a
1060 * full re-initialisation. We would need to notify
1061 * drivers so that they can re-setup the cards as
1062 * well, while keeping their queues at bay.
1063 *
1064 * For the moment, we take the easy way out - if the
1065 * new cards don't like our currently selected VDD,
1066 * they drop off the bus.
1067 */
1068 }
1069
1070 if (host->ocr == 0)
1071 return;
1072
1073 /*
1074 * Send the selected OCR multiple times... until the cards
1075 * all get the idea that they should be ready for CMD2.
1076 * (My SanDisk card seems to need this.)
1077 */
1078 if (host->mode == MMC_MODE_SD)
1079 mmc_send_app_op_cond(host, host->ocr, NULL);
1080 else
1081 mmc_send_op_cond(host, host->ocr, NULL);
1082
1083 mmc_discover_cards(host);
1084
1085 /*
1086 * Ok, now switch to push-pull mode.
1087 */
1088 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1089 host->ops->set_ios(host, &host->ios);
1090
1091 mmc_read_csds(host);
1092
1093 if (host->mode == MMC_MODE_SD)
1094 mmc_read_scrs(host);
1095 }
1096
1097
1098 /**
1099 * mmc_detect_change - process change of state on a MMC socket
1100 * @host: host which changed state.
1101 * @delay: optional delay to wait before detection (jiffies)
1102 *
1103 * All we know is that card(s) have been inserted or removed
1104 * from the socket(s). We don't know which socket or cards.
1105 */
1106 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1107 {
1108 if (delay)
1109 schedule_delayed_work(&host->detect, delay);
1110 else
1111 schedule_work(&host->detect);
1112 }
1113
1114 EXPORT_SYMBOL(mmc_detect_change);
1115
1116
1117 static void mmc_rescan(void *data)
1118 {
1119 struct mmc_host *host = data;
1120 struct list_head *l, *n;
1121
1122 mmc_claim_host(host);
1123
1124 if (host->ios.power_mode == MMC_POWER_ON)
1125 mmc_check_cards(host);
1126
1127 mmc_setup(host);
1128
1129 if (!list_empty(&host->cards)) {
1130 /*
1131 * (Re-)calculate the fastest clock rate which the
1132 * attached cards and the host support.
1133 */
1134 host->ios.clock = mmc_calculate_clock(host);
1135 host->ops->set_ios(host, &host->ios);
1136 }
1137
1138 mmc_release_host(host);
1139
1140 list_for_each_safe(l, n, &host->cards) {
1141 struct mmc_card *card = mmc_list_to_card(l);
1142
1143 /*
1144 * If this is a new and good card, register it.
1145 */
1146 if (!mmc_card_present(card) && !mmc_card_dead(card)) {
1147 if (mmc_register_card(card))
1148 mmc_card_set_dead(card);
1149 else
1150 mmc_card_set_present(card);
1151 }
1152
1153 /*
1154 * If this card is dead, destroy it.
1155 */
1156 if (mmc_card_dead(card)) {
1157 list_del(&card->node);
1158 mmc_remove_card(card);
1159 }
1160 }
1161
1162 /*
1163 * If we discover that there are no cards on the
1164 * bus, turn off the clock and power down.
1165 */
1166 if (list_empty(&host->cards))
1167 mmc_power_off(host);
1168 }
1169
1170
1171 /**
1172 * mmc_alloc_host - initialise the per-host structure.
1173 * @extra: sizeof private data structure
1174 * @dev: pointer to host device model structure
1175 *
1176 * Initialise the per-host structure.
1177 */
1178 struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
1179 {
1180 struct mmc_host *host;
1181
1182 host = mmc_alloc_host_sysfs(extra, dev);
1183 if (host) {
1184 spin_lock_init(&host->lock);
1185 init_waitqueue_head(&host->wq);
1186 INIT_LIST_HEAD(&host->cards);
1187 INIT_WORK(&host->detect, mmc_rescan, host);
1188
1189 /*
1190 * By default, hosts do not support SGIO or large requests.
1191 * They have to set these according to their abilities.
1192 */
1193 host->max_hw_segs = 1;
1194 host->max_phys_segs = 1;
1195 host->max_sectors = 1 << (PAGE_CACHE_SHIFT - 9);
1196 host->max_seg_size = PAGE_CACHE_SIZE;
1197 }
1198
1199 return host;
1200 }
1201
1202 EXPORT_SYMBOL(mmc_alloc_host);
1203
1204 /**
1205 * mmc_add_host - initialise host hardware
1206 * @host: mmc host
1207 */
1208 int mmc_add_host(struct mmc_host *host)
1209 {
1210 int ret;
1211
1212 ret = mmc_add_host_sysfs(host);
1213 if (ret == 0) {
1214 mmc_power_off(host);
1215 mmc_detect_change(host, 0);
1216 }
1217
1218 return ret;
1219 }
1220
1221 EXPORT_SYMBOL(mmc_add_host);
1222
1223 /**
1224 * mmc_remove_host - remove host hardware
1225 * @host: mmc host
1226 *
1227 * Unregister and remove all cards associated with this host,
1228 * and power down the MMC bus.
1229 */
1230 void mmc_remove_host(struct mmc_host *host)
1231 {
1232 struct list_head *l, *n;
1233
1234 list_for_each_safe(l, n, &host->cards) {
1235 struct mmc_card *card = mmc_list_to_card(l);
1236
1237 mmc_remove_card(card);
1238 }
1239
1240 mmc_power_off(host);
1241 mmc_remove_host_sysfs(host);
1242 }
1243
1244 EXPORT_SYMBOL(mmc_remove_host);
1245
1246 /**
1247 * mmc_free_host - free the host structure
1248 * @host: mmc host
1249 *
1250 * Free the host once all references to it have been dropped.
1251 */
1252 void mmc_free_host(struct mmc_host *host)
1253 {
1254 flush_scheduled_work();
1255 mmc_free_host_sysfs(host);
1256 }
1257
1258 EXPORT_SYMBOL(mmc_free_host);
1259
1260 #ifdef CONFIG_PM
1261
1262 /**
1263 * mmc_suspend_host - suspend a host
1264 * @host: mmc host
1265 * @state: suspend mode (PM_SUSPEND_xxx)
1266 */
1267 int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
1268 {
1269 mmc_claim_host(host);
1270 mmc_deselect_cards(host);
1271 mmc_power_off(host);
1272 mmc_release_host(host);
1273
1274 return 0;
1275 }
1276
1277 EXPORT_SYMBOL(mmc_suspend_host);
1278
1279 /**
1280 * mmc_resume_host - resume a previously suspended host
1281 * @host: mmc host
1282 */
1283 int mmc_resume_host(struct mmc_host *host)
1284 {
1285 mmc_rescan(host);
1286
1287 return 0;
1288 }
1289
1290 EXPORT_SYMBOL(mmc_resume_host);
1291
1292 #endif
1293
1294 MODULE_LICENSE("GPL");
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