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ACPI: thinkpad-acpi: improve dock subdriver initialization
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / mmc / mmc.c
blob6f2a282e2b9759c0511cf5501a0bd4e9bd501e3f
1 /*
2 * linux/drivers/mmc/mmc.c
3 *
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * SD support Copyright (C) 2005 Pierre Ossman, All Rights Reserved.
7 * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/completion.h>
17 #include <linux/device.h>
18 #include <linux/delay.h>
19 #include <linux/pagemap.h>
20 #include <linux/err.h>
21 #include <asm/scatterlist.h>
22 #include <linux/scatterlist.h>
23
24 #include <linux/mmc/card.h>
25 #include <linux/mmc/host.h>
26 #include <linux/mmc/protocol.h>
27
28 #include "mmc.h"
29
30 #define CMD_RETRIES 3
31
32 /*
33 * OCR Bit positions to 10s of Vdd mV.
34 */
35 static const unsigned short mmc_ocr_bit_to_vdd[] = {
36 150, 155, 160, 165, 170, 180, 190, 200,
37 210, 220, 230, 240, 250, 260, 270, 280,
38 290, 300, 310, 320, 330, 340, 350, 360
39 };
40
41 static const unsigned int tran_exp[] = {
42 10000, 100000, 1000000, 10000000,
43 0, 0, 0, 0
44 };
45
46 static const unsigned char tran_mant[] = {
47 0, 10, 12, 13, 15, 20, 25, 30,
48 35, 40, 45, 50, 55, 60, 70, 80,
49 };
50
51 static const unsigned int tacc_exp[] = {
52 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
53 };
54
55 static const unsigned int tacc_mant[] = {
56 0, 10, 12, 13, 15, 20, 25, 30,
57 35, 40, 45, 50, 55, 60, 70, 80,
58 };
59
60
61 /**
62 * mmc_request_done - finish processing an MMC request
63 * @host: MMC host which completed request
64 * @mrq: MMC request which request
65 *
66 * MMC drivers should call this function when they have completed
67 * their processing of a request.
68 */
69 void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
70 {
71 struct mmc_command *cmd = mrq->cmd;
72 int err = cmd->error;
73
74 pr_debug("%s: req done (CMD%u): %d/%d/%d: %08x %08x %08x %08x\n",
75 mmc_hostname(host), cmd->opcode, err,
76 mrq->data ? mrq->data->error : 0,
77 mrq->stop ? mrq->stop->error : 0,
78 cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]);
79
80 if (err && cmd->retries) {
81 cmd->retries--;
82 cmd->error = 0;
83 host->ops->request(host, mrq);
84 } else if (mrq->done) {
85 mrq->done(mrq);
86 }
87 }
88
89 EXPORT_SYMBOL(mmc_request_done);
90
91 /**
92 * mmc_start_request - start a command on a host
93 * @host: MMC host to start command on
94 * @mrq: MMC request to start
95 *
96 * Queue a command on the specified host. We expect the
97 * caller to be holding the host lock with interrupts disabled.
98 */
99 void
100 mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
101 {
102 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
103 mmc_hostname(host), mrq->cmd->opcode,
104 mrq->cmd->arg, mrq->cmd->flags);
105
106 WARN_ON(host->card_busy == NULL);
107
108 mrq->cmd->error = 0;
109 mrq->cmd->mrq = mrq;
110 if (mrq->data) {
111 mrq->cmd->data = mrq->data;
112 mrq->data->error = 0;
113 mrq->data->mrq = mrq;
114 if (mrq->stop) {
115 mrq->data->stop = mrq->stop;
116 mrq->stop->error = 0;
117 mrq->stop->mrq = mrq;
118 }
119 }
120 host->ops->request(host, mrq);
121 }
122
123 EXPORT_SYMBOL(mmc_start_request);
124
125 static void mmc_wait_done(struct mmc_request *mrq)
126 {
127 complete(mrq->done_data);
128 }
129
130 int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
131 {
132 DECLARE_COMPLETION_ONSTACK(complete);
133
134 mrq->done_data = &complete;
135 mrq->done = mmc_wait_done;
136
137 mmc_start_request(host, mrq);
138
139 wait_for_completion(&complete);
140
141 return 0;
142 }
143
144 EXPORT_SYMBOL(mmc_wait_for_req);
145
146 /**
147 * mmc_wait_for_cmd - start a command and wait for completion
148 * @host: MMC host to start command
149 * @cmd: MMC command to start
150 * @retries: maximum number of retries
151 *
152 * Start a new MMC command for a host, and wait for the command
153 * to complete. Return any error that occurred while the command
154 * was executing. Do not attempt to parse the response.
155 */
156 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
157 {
158 struct mmc_request mrq;
159
160 BUG_ON(host->card_busy == NULL);
161
162 memset(&mrq, 0, sizeof(struct mmc_request));
163
164 memset(cmd->resp, 0, sizeof(cmd->resp));
165 cmd->retries = retries;
166
167 mrq.cmd = cmd;
168 cmd->data = NULL;
169
170 mmc_wait_for_req(host, &mrq);
171
172 return cmd->error;
173 }
174
175 EXPORT_SYMBOL(mmc_wait_for_cmd);
176
177 /**
178 * mmc_wait_for_app_cmd - start an application command and wait for
179 completion
180 * @host: MMC host to start command
181 * @rca: RCA to send MMC_APP_CMD to
182 * @cmd: MMC command to start
183 * @retries: maximum number of retries
184 *
185 * Sends a MMC_APP_CMD, checks the card response, sends the command
186 * in the parameter and waits for it to complete. Return any error
187 * that occurred while the command was executing. Do not attempt to
188 * parse the response.
189 */
190 int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca,
191 struct mmc_command *cmd, int retries)
192 {
193 struct mmc_request mrq;
194 struct mmc_command appcmd;
195
196 int i, err;
197
198 BUG_ON(host->card_busy == NULL);
199 BUG_ON(retries < 0);
200
201 err = MMC_ERR_INVALID;
202
203 /*
204 * We have to resend MMC_APP_CMD for each attempt so
205 * we cannot use the retries field in mmc_command.
206 */
207 for (i = 0;i <= retries;i++) {
208 memset(&mrq, 0, sizeof(struct mmc_request));
209
210 appcmd.opcode = MMC_APP_CMD;
211 appcmd.arg = rca << 16;
212 appcmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
213 appcmd.retries = 0;
214 memset(appcmd.resp, 0, sizeof(appcmd.resp));
215 appcmd.data = NULL;
216
217 mrq.cmd = &appcmd;
218 appcmd.data = NULL;
219
220 mmc_wait_for_req(host, &mrq);
221
222 if (appcmd.error) {
223 err = appcmd.error;
224 continue;
225 }
226
227 /* Check that card supported application commands */
228 if (!(appcmd.resp[0] & R1_APP_CMD))
229 return MMC_ERR_FAILED;
230
231 memset(&mrq, 0, sizeof(struct mmc_request));
232
233 memset(cmd->resp, 0, sizeof(cmd->resp));
234 cmd->retries = 0;
235
236 mrq.cmd = cmd;
237 cmd->data = NULL;
238
239 mmc_wait_for_req(host, &mrq);
240
241 err = cmd->error;
242 if (cmd->error == MMC_ERR_NONE)
243 break;
244 }
245
246 return err;
247 }
248
249 EXPORT_SYMBOL(mmc_wait_for_app_cmd);
250
251 /**
252 * mmc_set_data_timeout - set the timeout for a data command
253 * @data: data phase for command
254 * @card: the MMC card associated with the data transfer
255 * @write: flag to differentiate reads from writes
256 */
257 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card,
258 int write)
259 {
260 unsigned int mult;
261
262 /*
263 * SD cards use a 100 multiplier rather than 10
264 */
265 mult = mmc_card_sd(card) ? 100 : 10;
266
267 /*
268 * Scale up the multiplier (and therefore the timeout) by
269 * the r2w factor for writes.
270 */
271 if (write)
272 mult <<= card->csd.r2w_factor;
273
274 data->timeout_ns = card->csd.tacc_ns * mult;
275 data->timeout_clks = card->csd.tacc_clks * mult;
276
277 /*
278 * SD cards also have an upper limit on the timeout.
279 */
280 if (mmc_card_sd(card)) {
281 unsigned int timeout_us, limit_us;
282
283 timeout_us = data->timeout_ns / 1000;
284 timeout_us += data->timeout_clks * 1000 /
285 (card->host->ios.clock / 1000);
286
287 if (write)
288 limit_us = 250000;
289 else
290 limit_us = 100000;
291
292 if (timeout_us > limit_us) {
293 data->timeout_ns = limit_us * 1000;
294 data->timeout_clks = 0;
295 }
296 }
297 }
298 EXPORT_SYMBOL(mmc_set_data_timeout);
299
300 static int mmc_select_card(struct mmc_host *host, struct mmc_card *card);
301
302 /**
303 * __mmc_claim_host - exclusively claim a host
304 * @host: mmc host to claim
305 * @card: mmc card to claim host for
306 *
307 * Claim a host for a set of operations. If a valid card
308 * is passed and this wasn't the last card selected, select
309 * the card before returning.
310 *
311 * Note: you should use mmc_card_claim_host or mmc_claim_host.
312 */
313 int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card)
314 {
315 DECLARE_WAITQUEUE(wait, current);
316 unsigned long flags;
317 int err = 0;
318
319 add_wait_queue(&host->wq, &wait);
320 spin_lock_irqsave(&host->lock, flags);
321 while (1) {
322 set_current_state(TASK_UNINTERRUPTIBLE);
323 if (host->card_busy == NULL)
324 break;
325 spin_unlock_irqrestore(&host->lock, flags);
326 schedule();
327 spin_lock_irqsave(&host->lock, flags);
328 }
329 set_current_state(TASK_RUNNING);
330 host->card_busy = card;
331 spin_unlock_irqrestore(&host->lock, flags);
332 remove_wait_queue(&host->wq, &wait);
333
334 if (card != (void *)-1) {
335 err = mmc_select_card(host, card);
336 if (err != MMC_ERR_NONE)
337 return err;
338 }
339
340 return err;
341 }
342
343 EXPORT_SYMBOL(__mmc_claim_host);
344
345 /**
346 * mmc_release_host - release a host
347 * @host: mmc host to release
348 *
349 * Release a MMC host, allowing others to claim the host
350 * for their operations.
351 */
352 void mmc_release_host(struct mmc_host *host)
353 {
354 unsigned long flags;
355
356 BUG_ON(host->card_busy == NULL);
357
358 spin_lock_irqsave(&host->lock, flags);
359 host->card_busy = NULL;
360 spin_unlock_irqrestore(&host->lock, flags);
361
362 wake_up(&host->wq);
363 }
364
365 EXPORT_SYMBOL(mmc_release_host);
366
367 static inline void mmc_set_ios(struct mmc_host *host)
368 {
369 struct mmc_ios *ios = &host->ios;
370
371 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u width %u\n",
372 mmc_hostname(host), ios->clock, ios->bus_mode,
373 ios->power_mode, ios->chip_select, ios->vdd,
374 ios->bus_width);
375
376 host->ops->set_ios(host, ios);
377 }
378
379 static int mmc_select_card(struct mmc_host *host, struct mmc_card *card)
380 {
381 int err;
382 struct mmc_command cmd;
383
384 BUG_ON(host->card_busy == NULL);
385
386 if (host->card_selected == card)
387 return MMC_ERR_NONE;
388
389 host->card_selected = card;
390
391 cmd.opcode = MMC_SELECT_CARD;
392 cmd.arg = card->rca << 16;
393 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
394
395 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
396 if (err != MMC_ERR_NONE)
397 return err;
398
399 /*
400 * We can only change the bus width of SD cards when
401 * they are selected so we have to put the handling
402 * here.
403 *
404 * The card is in 1 bit mode by default so
405 * we only need to change if it supports the
406 * wider version.
407 */
408 if (mmc_card_sd(card) &&
409 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
410
411 /*
412 * Default bus width is 1 bit.
413 */
414 host->ios.bus_width = MMC_BUS_WIDTH_1;
415
416 if (host->caps & MMC_CAP_4_BIT_DATA) {
417 struct mmc_command cmd;
418 cmd.opcode = SD_APP_SET_BUS_WIDTH;
419 cmd.arg = SD_BUS_WIDTH_4;
420 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
421
422 err = mmc_wait_for_app_cmd(host, card->rca, &cmd,
423 CMD_RETRIES);
424 if (err != MMC_ERR_NONE)
425 return err;
426
427 host->ios.bus_width = MMC_BUS_WIDTH_4;
428 }
429 }
430
431 mmc_set_ios(host);
432
433 return MMC_ERR_NONE;
434 }
435
436 /*
437 * Ensure that no card is selected.
438 */
439 static void mmc_deselect_cards(struct mmc_host *host)
440 {
441 struct mmc_command cmd;
442
443 if (host->card_selected) {
444 host->card_selected = NULL;
445
446 cmd.opcode = MMC_SELECT_CARD;
447 cmd.arg = 0;
448 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
449
450 mmc_wait_for_cmd(host, &cmd, 0);
451 }
452 }
453
454
455 static inline void mmc_delay(unsigned int ms)
456 {
457 if (ms < 1000 / HZ) {
458 cond_resched();
459 mdelay(ms);
460 } else {
461 msleep(ms);
462 }
463 }
464
465 /*
466 * Mask off any voltages we don't support and select
467 * the lowest voltage
468 */
469 static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
470 {
471 int bit;
472
473 ocr &= host->ocr_avail;
474
475 bit = ffs(ocr);
476 if (bit) {
477 bit -= 1;
478
479 ocr &= 3 << bit;
480
481 host->ios.vdd = bit;
482 mmc_set_ios(host);
483 } else {
484 ocr = 0;
485 }
486
487 return ocr;
488 }
489
490 #define UNSTUFF_BITS(resp,start,size) \
491 ({ \
492 const int __size = size; \
493 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
494 const int __off = 3 - ((start) / 32); \
495 const int __shft = (start) & 31; \
496 u32 __res; \
497 \
498 __res = resp[__off] >> __shft; \
499 if (__size + __shft > 32) \
500 __res |= resp[__off-1] << ((32 - __shft) % 32); \
501 __res & __mask; \
502 })
503
504 /*
505 * Given the decoded CSD structure, decode the raw CID to our CID structure.
506 */
507 static void mmc_decode_cid(struct mmc_card *card)
508 {
509 u32 *resp = card->raw_cid;
510
511 memset(&card->cid, 0, sizeof(struct mmc_cid));
512
513 if (mmc_card_sd(card)) {
514 /*
515 * SD doesn't currently have a version field so we will
516 * have to assume we can parse this.
517 */
518 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
519 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
520 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
521 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
522 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
523 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
524 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
525 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
526 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
527 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
528 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
529 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
530
531 card->cid.year += 2000; /* SD cards year offset */
532 } else {
533 /*
534 * The selection of the format here is based upon published
535 * specs from sandisk and from what people have reported.
536 */
537 switch (card->csd.mmca_vsn) {
538 case 0: /* MMC v1.0 - v1.2 */
539 case 1: /* MMC v1.4 */
540 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
541 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
542 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
543 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
544 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
545 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
546 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
547 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
548 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
549 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
550 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
551 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
552 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
553 break;
554
555 case 2: /* MMC v2.0 - v2.2 */
556 case 3: /* MMC v3.1 - v3.3 */
557 case 4: /* MMC v4 */
558 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
559 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
560 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
561 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
562 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
563 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
564 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
565 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
566 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
567 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
568 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
569 break;
570
571 default:
572 printk("%s: card has unknown MMCA version %d\n",
573 mmc_hostname(card->host), card->csd.mmca_vsn);
574 mmc_card_set_bad(card);
575 break;
576 }
577 }
578 }
579
580 /*
581 * Given a 128-bit response, decode to our card CSD structure.
582 */
583 static void mmc_decode_csd(struct mmc_card *card)
584 {
585 struct mmc_csd *csd = &card->csd;
586 unsigned int e, m, csd_struct;
587 u32 *resp = card->raw_csd;
588
589 if (mmc_card_sd(card)) {
590 csd_struct = UNSTUFF_BITS(resp, 126, 2);
591 if (csd_struct != 0) {
592 printk("%s: unrecognised CSD structure version %d\n",
593 mmc_hostname(card->host), csd_struct);
594 mmc_card_set_bad(card);
595 return;
596 }
597
598 m = UNSTUFF_BITS(resp, 115, 4);
599 e = UNSTUFF_BITS(resp, 112, 3);
600 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
601 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
602
603 m = UNSTUFF_BITS(resp, 99, 4);
604 e = UNSTUFF_BITS(resp, 96, 3);
605 csd->max_dtr = tran_exp[e] * tran_mant[m];
606 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
607
608 e = UNSTUFF_BITS(resp, 47, 3);
609 m = UNSTUFF_BITS(resp, 62, 12);
610 csd->capacity = (1 + m) << (e + 2);
611
612 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
613 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
614 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
615 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
616 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
617 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
618 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
619 } else {
620 /*
621 * We only understand CSD structure v1.1 and v1.2.
622 * v1.2 has extra information in bits 15, 11 and 10.
623 */
624 csd_struct = UNSTUFF_BITS(resp, 126, 2);
625 if (csd_struct != 1 && csd_struct != 2) {
626 printk("%s: unrecognised CSD structure version %d\n",
627 mmc_hostname(card->host), csd_struct);
628 mmc_card_set_bad(card);
629 return;
630 }
631
632 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
633 m = UNSTUFF_BITS(resp, 115, 4);
634 e = UNSTUFF_BITS(resp, 112, 3);
635 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
636 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
637
638 m = UNSTUFF_BITS(resp, 99, 4);
639 e = UNSTUFF_BITS(resp, 96, 3);
640 csd->max_dtr = tran_exp[e] * tran_mant[m];
641 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
642
643 e = UNSTUFF_BITS(resp, 47, 3);
644 m = UNSTUFF_BITS(resp, 62, 12);
645 csd->capacity = (1 + m) << (e + 2);
646
647 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
648 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
649 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
650 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
651 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
652 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
653 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
654 }
655 }
656
657 /*
658 * Given a 64-bit response, decode to our card SCR structure.
659 */
660 static void mmc_decode_scr(struct mmc_card *card)
661 {
662 struct sd_scr *scr = &card->scr;
663 unsigned int scr_struct;
664 u32 resp[4];
665
666 BUG_ON(!mmc_card_sd(card));
667
668 resp[3] = card->raw_scr[1];
669 resp[2] = card->raw_scr[0];
670
671 scr_struct = UNSTUFF_BITS(resp, 60, 4);
672 if (scr_struct != 0) {
673 printk("%s: unrecognised SCR structure version %d\n",
674 mmc_hostname(card->host), scr_struct);
675 mmc_card_set_bad(card);
676 return;
677 }
678
679 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
680 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
681 }
682
683 /*
684 * Locate a MMC card on this MMC host given a raw CID.
685 */
686 static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid)
687 {
688 struct mmc_card *card;
689
690 list_for_each_entry(card, &host->cards, node) {
691 if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0)
692 return card;
693 }
694 return NULL;
695 }
696
697 /*
698 * Allocate a new MMC card, and assign a unique RCA.
699 */
700 static struct mmc_card *
701 mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca)
702 {
703 struct mmc_card *card, *c;
704 unsigned int rca = *frca;
705
706 card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL);
707 if (!card)
708 return ERR_PTR(-ENOMEM);
709
710 mmc_init_card(card, host);
711 memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid));
712
713 again:
714 list_for_each_entry(c, &host->cards, node)
715 if (c->rca == rca) {
716 rca++;
717 goto again;
718 }
719
720 card->rca = rca;
721
722 *frca = rca;
723
724 return card;
725 }
726
727 /*
728 * Tell attached cards to go to IDLE state
729 */
730 static void mmc_idle_cards(struct mmc_host *host)
731 {
732 struct mmc_command cmd;
733
734 host->ios.chip_select = MMC_CS_HIGH;
735 mmc_set_ios(host);
736
737 mmc_delay(1);
738
739 cmd.opcode = MMC_GO_IDLE_STATE;
740 cmd.arg = 0;
741 cmd.flags = MMC_RSP_NONE | MMC_CMD_BC;
742
743 mmc_wait_for_cmd(host, &cmd, 0);
744
745 mmc_delay(1);
746
747 host->ios.chip_select = MMC_CS_DONTCARE;
748 mmc_set_ios(host);
749
750 mmc_delay(1);
751 }
752
753 /*
754 * Apply power to the MMC stack. This is a two-stage process.
755 * First, we enable power to the card without the clock running.
756 * We then wait a bit for the power to stabilise. Finally,
757 * enable the bus drivers and clock to the card.
758 *
759 * We must _NOT_ enable the clock prior to power stablising.
760 *
761 * If a host does all the power sequencing itself, ignore the
762 * initial MMC_POWER_UP stage.
763 */
764 static void mmc_power_up(struct mmc_host *host)
765 {
766 int bit = fls(host->ocr_avail) - 1;
767
768 host->ios.vdd = bit;
769 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
770 host->ios.chip_select = MMC_CS_DONTCARE;
771 host->ios.power_mode = MMC_POWER_UP;
772 host->ios.bus_width = MMC_BUS_WIDTH_1;
773 mmc_set_ios(host);
774
775 mmc_delay(1);
776
777 host->ios.clock = host->f_min;
778 host->ios.power_mode = MMC_POWER_ON;
779 mmc_set_ios(host);
780
781 mmc_delay(2);
782 }
783
784 static void mmc_power_off(struct mmc_host *host)
785 {
786 host->ios.clock = 0;
787 host->ios.vdd = 0;
788 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
789 host->ios.chip_select = MMC_CS_DONTCARE;
790 host->ios.power_mode = MMC_POWER_OFF;
791 host->ios.bus_width = MMC_BUS_WIDTH_1;
792 mmc_set_ios(host);
793 }
794
795 static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
796 {
797 struct mmc_command cmd;
798 int i, err = 0;
799
800 cmd.opcode = MMC_SEND_OP_COND;
801 cmd.arg = ocr;
802 cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
803
804 for (i = 100; i; i--) {
805 err = mmc_wait_for_cmd(host, &cmd, 0);
806 if (err != MMC_ERR_NONE)
807 break;
808
809 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
810 break;
811
812 err = MMC_ERR_TIMEOUT;
813
814 mmc_delay(10);
815 }
816
817 if (rocr)
818 *rocr = cmd.resp[0];
819
820 return err;
821 }
822
823 static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
824 {
825 struct mmc_command cmd;
826 int i, err = 0;
827
828 cmd.opcode = SD_APP_OP_COND;
829 cmd.arg = ocr;
830 cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
831
832 for (i = 100; i; i--) {
833 err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES);
834 if (err != MMC_ERR_NONE)
835 break;
836
837 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
838 break;
839
840 err = MMC_ERR_TIMEOUT;
841
842 mmc_delay(10);
843 }
844
845 if (rocr)
846 *rocr = cmd.resp[0];
847
848 return err;
849 }
850
851 /*
852 * Discover cards by requesting their CID. If this command
853 * times out, it is not an error; there are no further cards
854 * to be discovered. Add new cards to the list.
855 *
856 * Create a mmc_card entry for each discovered card, assigning
857 * it an RCA, and save the raw CID for decoding later.
858 */
859 static void mmc_discover_cards(struct mmc_host *host)
860 {
861 struct mmc_card *card;
862 unsigned int first_rca = 1, err;
863
864 while (1) {
865 struct mmc_command cmd;
866
867 cmd.opcode = MMC_ALL_SEND_CID;
868 cmd.arg = 0;
869 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
870
871 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
872 if (err == MMC_ERR_TIMEOUT) {
873 err = MMC_ERR_NONE;
874 break;
875 }
876 if (err != MMC_ERR_NONE) {
877 printk(KERN_ERR "%s: error requesting CID: %d\n",
878 mmc_hostname(host), err);
879 break;
880 }
881
882 card = mmc_find_card(host, cmd.resp);
883 if (!card) {
884 card = mmc_alloc_card(host, cmd.resp, &first_rca);
885 if (IS_ERR(card)) {
886 err = PTR_ERR(card);
887 break;
888 }
889 list_add(&card->node, &host->cards);
890 }
891
892 card->state &= ~MMC_STATE_DEAD;
893
894 if (host->mode == MMC_MODE_SD) {
895 mmc_card_set_sd(card);
896
897 cmd.opcode = SD_SEND_RELATIVE_ADDR;
898 cmd.arg = 0;
899 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
900
901 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
902 if (err != MMC_ERR_NONE)
903 mmc_card_set_dead(card);
904 else {
905 card->rca = cmd.resp[0] >> 16;
906
907 if (!host->ops->get_ro) {
908 printk(KERN_WARNING "%s: host does not "
909 "support reading read-only "
910 "switch. assuming write-enable.\n",
911 mmc_hostname(host));
912 } else {
913 if (host->ops->get_ro(host))
914 mmc_card_set_readonly(card);
915 }
916 }
917 } else {
918 cmd.opcode = MMC_SET_RELATIVE_ADDR;
919 cmd.arg = card->rca << 16;
920 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
921
922 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
923 if (err != MMC_ERR_NONE)
924 mmc_card_set_dead(card);
925 }
926 }
927 }
928
929 static void mmc_read_csds(struct mmc_host *host)
930 {
931 struct mmc_card *card;
932
933 list_for_each_entry(card, &host->cards, node) {
934 struct mmc_command cmd;
935 int err;
936
937 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
938 continue;
939
940 cmd.opcode = MMC_SEND_CSD;
941 cmd.arg = card->rca << 16;
942 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
943
944 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
945 if (err != MMC_ERR_NONE) {
946 mmc_card_set_dead(card);
947 continue;
948 }
949
950 memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd));
951
952 mmc_decode_csd(card);
953 mmc_decode_cid(card);
954 }
955 }
956
957 static void mmc_process_ext_csds(struct mmc_host *host)
958 {
959 int err;
960 struct mmc_card *card;
961
962 struct mmc_request mrq;
963 struct mmc_command cmd;
964 struct mmc_data data;
965
966 struct scatterlist sg;
967
968 /*
969 * As the ext_csd is so large and mostly unused, we don't store the
970 * raw block in mmc_card.
971 */
972 u8 *ext_csd;
973 ext_csd = kmalloc(512, GFP_KERNEL);
974 if (!ext_csd) {
975 printk("%s: could not allocate a buffer to receive the ext_csd."
976 "mmc v4 cards will be treated as v3.\n",
977 mmc_hostname(host));
978 return;
979 }
980
981 list_for_each_entry(card, &host->cards, node) {
982 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
983 continue;
984 if (mmc_card_sd(card))
985 continue;
986 if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
987 continue;
988
989 err = mmc_select_card(host, card);
990 if (err != MMC_ERR_NONE) {
991 mmc_card_set_dead(card);
992 continue;
993 }
994
995 memset(&cmd, 0, sizeof(struct mmc_command));
996
997 cmd.opcode = MMC_SEND_EXT_CSD;
998 cmd.arg = 0;
999 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1000
1001 memset(&data, 0, sizeof(struct mmc_data));
1002
1003 mmc_set_data_timeout(&data, card, 0);
1004
1005 data.blksz = 512;
1006 data.blocks = 1;
1007 data.flags = MMC_DATA_READ;
1008 data.sg = &sg;
1009 data.sg_len = 1;
1010
1011 memset(&mrq, 0, sizeof(struct mmc_request));
1012
1013 mrq.cmd = &cmd;
1014 mrq.data = &data;
1015
1016 sg_init_one(&sg, ext_csd, 512);
1017
1018 mmc_wait_for_req(host, &mrq);
1019
1020 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
1021 mmc_card_set_dead(card);
1022 continue;
1023 }
1024
1025 switch (ext_csd[EXT_CSD_CARD_TYPE]) {
1026 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
1027 card->ext_csd.hs_max_dtr = 52000000;
1028 break;
1029 case EXT_CSD_CARD_TYPE_26:
1030 card->ext_csd.hs_max_dtr = 26000000;
1031 break;
1032 default:
1033 /* MMC v4 spec says this cannot happen */
1034 printk("%s: card is mmc v4 but doesn't support "
1035 "any high-speed modes.\n",
1036 mmc_hostname(card->host));
1037 mmc_card_set_bad(card);
1038 continue;
1039 }
1040
1041 /* Activate highspeed support. */
1042 cmd.opcode = MMC_SWITCH;
1043 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
1044 (EXT_CSD_HS_TIMING << 16) |
1045 (1 << 8) |
1046 EXT_CSD_CMD_SET_NORMAL;
1047 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1048
1049 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1050 if (err != MMC_ERR_NONE) {
1051 printk("%s: failed to switch card to mmc v4 "
1052 "high-speed mode.\n",
1053 mmc_hostname(card->host));
1054 continue;
1055 }
1056
1057 mmc_card_set_highspeed(card);
1058
1059 /* Check for host support for wide-bus modes. */
1060 if (!(host->caps & MMC_CAP_4_BIT_DATA)) {
1061 continue;
1062 }
1063
1064 /* Activate 4-bit support. */
1065 cmd.opcode = MMC_SWITCH;
1066 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
1067 (EXT_CSD_BUS_WIDTH << 16) |
1068 (EXT_CSD_BUS_WIDTH_4 << 8) |
1069 EXT_CSD_CMD_SET_NORMAL;
1070 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1071
1072 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1073 if (err != MMC_ERR_NONE) {
1074 printk("%s: failed to switch card to "
1075 "mmc v4 4-bit bus mode.\n",
1076 mmc_hostname(card->host));
1077 continue;
1078 }
1079
1080 host->ios.bus_width = MMC_BUS_WIDTH_4;
1081 }
1082
1083 kfree(ext_csd);
1084
1085 mmc_deselect_cards(host);
1086 }
1087
1088 static void mmc_read_scrs(struct mmc_host *host)
1089 {
1090 int err;
1091 struct mmc_card *card;
1092 struct mmc_request mrq;
1093 struct mmc_command cmd;
1094 struct mmc_data data;
1095 struct scatterlist sg;
1096
1097 list_for_each_entry(card, &host->cards, node) {
1098 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
1099 continue;
1100 if (!mmc_card_sd(card))
1101 continue;
1102
1103 err = mmc_select_card(host, card);
1104 if (err != MMC_ERR_NONE) {
1105 mmc_card_set_dead(card);
1106 continue;
1107 }
1108
1109 memset(&cmd, 0, sizeof(struct mmc_command));
1110
1111 cmd.opcode = MMC_APP_CMD;
1112 cmd.arg = card->rca << 16;
1113 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1114
1115 err = mmc_wait_for_cmd(host, &cmd, 0);
1116 if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) {
1117 mmc_card_set_dead(card);
1118 continue;
1119 }
1120
1121 memset(&cmd, 0, sizeof(struct mmc_command));
1122
1123 cmd.opcode = SD_APP_SEND_SCR;
1124 cmd.arg = 0;
1125 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1126
1127 memset(&data, 0, sizeof(struct mmc_data));
1128
1129 mmc_set_data_timeout(&data, card, 0);
1130
1131 data.blksz = 1 << 3;
1132 data.blocks = 1;
1133 data.flags = MMC_DATA_READ;
1134 data.sg = &sg;
1135 data.sg_len = 1;
1136
1137 memset(&mrq, 0, sizeof(struct mmc_request));
1138
1139 mrq.cmd = &cmd;
1140 mrq.data = &data;
1141
1142 sg_init_one(&sg, (u8*)card->raw_scr, 8);
1143
1144 mmc_wait_for_req(host, &mrq);
1145
1146 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
1147 mmc_card_set_dead(card);
1148 continue;
1149 }
1150
1151 card->raw_scr[0] = ntohl(card->raw_scr[0]);
1152 card->raw_scr[1] = ntohl(card->raw_scr[1]);
1153
1154 mmc_decode_scr(card);
1155 }
1156
1157 mmc_deselect_cards(host);
1158 }
1159
1160 static void mmc_read_switch_caps(struct mmc_host *host)
1161 {
1162 int err;
1163 struct mmc_card *card;
1164 struct mmc_request mrq;
1165 struct mmc_command cmd;
1166 struct mmc_data data;
1167 unsigned char *status;
1168 struct scatterlist sg;
1169
1170 status = kmalloc(64, GFP_KERNEL);
1171 if (!status) {
1172 printk(KERN_WARNING "%s: Unable to allocate buffer for "
1173 "reading switch capabilities.\n",
1174 mmc_hostname(host));
1175 return;
1176 }
1177
1178 list_for_each_entry(card, &host->cards, node) {
1179 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
1180 continue;
1181 if (!mmc_card_sd(card))
1182 continue;
1183 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
1184 continue;
1185
1186 err = mmc_select_card(host, card);
1187 if (err != MMC_ERR_NONE) {
1188 mmc_card_set_dead(card);
1189 continue;
1190 }
1191
1192 memset(&cmd, 0, sizeof(struct mmc_command));
1193
1194 cmd.opcode = SD_SWITCH;
1195 cmd.arg = 0x00FFFFF1;
1196 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1197
1198 memset(&data, 0, sizeof(struct mmc_data));
1199
1200 mmc_set_data_timeout(&data, card, 0);
1201
1202 data.blksz = 64;
1203 data.blocks = 1;
1204 data.flags = MMC_DATA_READ;
1205 data.sg = &sg;
1206 data.sg_len = 1;
1207
1208 memset(&mrq, 0, sizeof(struct mmc_request));
1209
1210 mrq.cmd = &cmd;
1211 mrq.data = &data;
1212
1213 sg_init_one(&sg, status, 64);
1214
1215 mmc_wait_for_req(host, &mrq);
1216
1217 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
1218 mmc_card_set_dead(card);
1219 continue;
1220 }
1221
1222 if (status[13] & 0x02)
1223 card->sw_caps.hs_max_dtr = 50000000;
1224
1225 memset(&cmd, 0, sizeof(struct mmc_command));
1226
1227 cmd.opcode = SD_SWITCH;
1228 cmd.arg = 0x80FFFFF1;
1229 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1230
1231 memset(&data, 0, sizeof(struct mmc_data));
1232
1233 mmc_set_data_timeout(&data, card, 0);
1234
1235 data.blksz = 64;
1236 data.blocks = 1;
1237 data.flags = MMC_DATA_READ;
1238 data.sg = &sg;
1239 data.sg_len = 1;
1240
1241 memset(&mrq, 0, sizeof(struct mmc_request));
1242
1243 mrq.cmd = &cmd;
1244 mrq.data = &data;
1245
1246 sg_init_one(&sg, status, 64);
1247
1248 mmc_wait_for_req(host, &mrq);
1249
1250 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
1251 mmc_card_set_dead(card);
1252 continue;
1253 }
1254
1255 if ((status[16] & 0xF) != 1) {
1256 printk(KERN_WARNING "%s: Problem switching card "
1257 "into high-speed mode!\n",
1258 mmc_hostname(host));
1259 continue;
1260 }
1261
1262 mmc_card_set_highspeed(card);
1263 }
1264
1265 kfree(status);
1266
1267 mmc_deselect_cards(host);
1268 }
1269
1270 static unsigned int mmc_calculate_clock(struct mmc_host *host)
1271 {
1272 struct mmc_card *card;
1273 unsigned int max_dtr = host->f_max;
1274
1275 list_for_each_entry(card, &host->cards, node)
1276 if (!mmc_card_dead(card)) {
1277 if (mmc_card_highspeed(card) && mmc_card_sd(card)) {
1278 if (max_dtr > card->sw_caps.hs_max_dtr)
1279 max_dtr = card->sw_caps.hs_max_dtr;
1280 } else if (mmc_card_highspeed(card) && !mmc_card_sd(card)) {
1281 if (max_dtr > card->ext_csd.hs_max_dtr)
1282 max_dtr = card->ext_csd.hs_max_dtr;
1283 } else if (max_dtr > card->csd.max_dtr) {
1284 max_dtr = card->csd.max_dtr;
1285 }
1286 }
1287
1288 pr_debug("%s: selected %d.%03dMHz transfer rate\n",
1289 mmc_hostname(host),
1290 max_dtr / 1000000, (max_dtr / 1000) % 1000);
1291
1292 return max_dtr;
1293 }
1294
1295 /*
1296 * Check whether cards we already know about are still present.
1297 * We do this by requesting status, and checking whether a card
1298 * responds.
1299 *
1300 * A request for status does not cause a state change in data
1301 * transfer mode.
1302 */
1303 static void mmc_check_cards(struct mmc_host *host)
1304 {
1305 struct list_head *l, *n;
1306
1307 mmc_deselect_cards(host);
1308
1309 list_for_each_safe(l, n, &host->cards) {
1310 struct mmc_card *card = mmc_list_to_card(l);
1311 struct mmc_command cmd;
1312 int err;
1313
1314 cmd.opcode = MMC_SEND_STATUS;
1315 cmd.arg = card->rca << 16;
1316 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1317
1318 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1319 if (err == MMC_ERR_NONE)
1320 continue;
1321
1322 mmc_card_set_dead(card);
1323 }
1324 }
1325
1326 static void mmc_setup(struct mmc_host *host)
1327 {
1328 if (host->ios.power_mode != MMC_POWER_ON) {
1329 int err;
1330 u32 ocr;
1331
1332 host->mode = MMC_MODE_SD;
1333
1334 mmc_power_up(host);
1335 mmc_idle_cards(host);
1336
1337 err = mmc_send_app_op_cond(host, 0, &ocr);
1338
1339 /*
1340 * If we fail to detect any SD cards then try
1341 * searching for MMC cards.
1342 */
1343 if (err != MMC_ERR_NONE) {
1344 host->mode = MMC_MODE_MMC;
1345
1346 err = mmc_send_op_cond(host, 0, &ocr);
1347 if (err != MMC_ERR_NONE)
1348 return;
1349 }
1350
1351 host->ocr = mmc_select_voltage(host, ocr);
1352
1353 /*
1354 * Since we're changing the OCR value, we seem to
1355 * need to tell some cards to go back to the idle
1356 * state. We wait 1ms to give cards time to
1357 * respond.
1358 */
1359 if (host->ocr)
1360 mmc_idle_cards(host);
1361 } else {
1362 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1363 host->ios.clock = host->f_min;
1364 mmc_set_ios(host);
1365
1366 /*
1367 * We should remember the OCR mask from the existing
1368 * cards, and detect the new cards OCR mask, combine
1369 * the two and re-select the VDD. However, if we do
1370 * change VDD, we should do an idle, and then do a
1371 * full re-initialisation. We would need to notify
1372 * drivers so that they can re-setup the cards as
1373 * well, while keeping their queues at bay.
1374 *
1375 * For the moment, we take the easy way out - if the
1376 * new cards don't like our currently selected VDD,
1377 * they drop off the bus.
1378 */
1379 }
1380
1381 if (host->ocr == 0)
1382 return;
1383
1384 /*
1385 * Send the selected OCR multiple times... until the cards
1386 * all get the idea that they should be ready for CMD2.
1387 * (My SanDisk card seems to need this.)
1388 */
1389 if (host->mode == MMC_MODE_SD)
1390 mmc_send_app_op_cond(host, host->ocr, NULL);
1391 else
1392 mmc_send_op_cond(host, host->ocr, NULL);
1393
1394 mmc_discover_cards(host);
1395
1396 /*
1397 * Ok, now switch to push-pull mode.
1398 */
1399 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1400 mmc_set_ios(host);
1401
1402 mmc_read_csds(host);
1403
1404 if (host->mode == MMC_MODE_SD) {
1405 mmc_read_scrs(host);
1406 mmc_read_switch_caps(host);
1407 } else
1408 mmc_process_ext_csds(host);
1409 }
1410
1411
1412 /**
1413 * mmc_detect_change - process change of state on a MMC socket
1414 * @host: host which changed state.
1415 * @delay: optional delay to wait before detection (jiffies)
1416 *
1417 * All we know is that card(s) have been inserted or removed
1418 * from the socket(s). We don't know which socket or cards.
1419 */
1420 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1421 {
1422 mmc_schedule_delayed_work(&host->detect, delay);
1423 }
1424
1425 EXPORT_SYMBOL(mmc_detect_change);
1426
1427
1428 static void mmc_rescan(struct work_struct *work)
1429 {
1430 struct mmc_host *host =
1431 container_of(work, struct mmc_host, detect.work);
1432 struct list_head *l, *n;
1433 unsigned char power_mode;
1434
1435 mmc_claim_host(host);
1436
1437 /*
1438 * Check for removed cards and newly inserted ones. We check for
1439 * removed cards first so we can intelligently re-select the VDD.
1440 */
1441 power_mode = host->ios.power_mode;
1442 if (power_mode == MMC_POWER_ON)
1443 mmc_check_cards(host);
1444
1445 mmc_setup(host);
1446
1447 /*
1448 * Some broken cards process CMD1 even in stand-by state. There is
1449 * no reply, but an ILLEGAL_COMMAND error is cached and returned
1450 * after next command. We poll for card status here to clear any
1451 * possibly pending error.
1452 */
1453 if (power_mode == MMC_POWER_ON)
1454 mmc_check_cards(host);
1455
1456 if (!list_empty(&host->cards)) {
1457 /*
1458 * (Re-)calculate the fastest clock rate which the
1459 * attached cards and the host support.
1460 */
1461 host->ios.clock = mmc_calculate_clock(host);
1462 mmc_set_ios(host);
1463 }
1464
1465 mmc_release_host(host);
1466
1467 list_for_each_safe(l, n, &host->cards) {
1468 struct mmc_card *card = mmc_list_to_card(l);
1469
1470 /*
1471 * If this is a new and good card, register it.
1472 */
1473 if (!mmc_card_present(card) && !mmc_card_dead(card)) {
1474 if (mmc_register_card(card))
1475 mmc_card_set_dead(card);
1476 else
1477 mmc_card_set_present(card);
1478 }
1479
1480 /*
1481 * If this card is dead, destroy it.
1482 */
1483 if (mmc_card_dead(card)) {
1484 list_del(&card->node);
1485 mmc_remove_card(card);
1486 }
1487 }
1488
1489 /*
1490 * If we discover that there are no cards on the
1491 * bus, turn off the clock and power down.
1492 */
1493 if (list_empty(&host->cards))
1494 mmc_power_off(host);
1495 }
1496
1497
1498 /**
1499 * mmc_alloc_host - initialise the per-host structure.
1500 * @extra: sizeof private data structure
1501 * @dev: pointer to host device model structure
1502 *
1503 * Initialise the per-host structure.
1504 */
1505 struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
1506 {
1507 struct mmc_host *host;
1508
1509 host = mmc_alloc_host_sysfs(extra, dev);
1510 if (host) {
1511 spin_lock_init(&host->lock);
1512 init_waitqueue_head(&host->wq);
1513 INIT_LIST_HEAD(&host->cards);
1514 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
1515
1516 /*
1517 * By default, hosts do not support SGIO or large requests.
1518 * They have to set these according to their abilities.
1519 */
1520 host->max_hw_segs = 1;
1521 host->max_phys_segs = 1;
1522 host->max_sectors = 1 << (PAGE_CACHE_SHIFT - 9);
1523 host->max_seg_size = PAGE_CACHE_SIZE;
1524 }
1525
1526 return host;
1527 }
1528
1529 EXPORT_SYMBOL(mmc_alloc_host);
1530
1531 /**
1532 * mmc_add_host - initialise host hardware
1533 * @host: mmc host
1534 */
1535 int mmc_add_host(struct mmc_host *host)
1536 {
1537 int ret;
1538
1539 ret = mmc_add_host_sysfs(host);
1540 if (ret == 0) {
1541 mmc_power_off(host);
1542 mmc_detect_change(host, 0);
1543 }
1544
1545 return ret;
1546 }
1547
1548 EXPORT_SYMBOL(mmc_add_host);
1549
1550 /**
1551 * mmc_remove_host - remove host hardware
1552 * @host: mmc host
1553 *
1554 * Unregister and remove all cards associated with this host,
1555 * and power down the MMC bus.
1556 */
1557 void mmc_remove_host(struct mmc_host *host)
1558 {
1559 struct list_head *l, *n;
1560
1561 list_for_each_safe(l, n, &host->cards) {
1562 struct mmc_card *card = mmc_list_to_card(l);
1563
1564 mmc_remove_card(card);
1565 }
1566
1567 mmc_power_off(host);
1568 mmc_remove_host_sysfs(host);
1569 }
1570
1571 EXPORT_SYMBOL(mmc_remove_host);
1572
1573 /**
1574 * mmc_free_host - free the host structure
1575 * @host: mmc host
1576 *
1577 * Free the host once all references to it have been dropped.
1578 */
1579 void mmc_free_host(struct mmc_host *host)
1580 {
1581 mmc_flush_scheduled_work();
1582 mmc_free_host_sysfs(host);
1583 }
1584
1585 EXPORT_SYMBOL(mmc_free_host);
1586
1587 #ifdef CONFIG_PM
1588
1589 /**
1590 * mmc_suspend_host - suspend a host
1591 * @host: mmc host
1592 * @state: suspend mode (PM_SUSPEND_xxx)
1593 */
1594 int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
1595 {
1596 mmc_claim_host(host);
1597 mmc_deselect_cards(host);
1598 mmc_power_off(host);
1599 mmc_release_host(host);
1600
1601 return 0;
1602 }
1603
1604 EXPORT_SYMBOL(mmc_suspend_host);
1605
1606 /**
1607 * mmc_resume_host - resume a previously suspended host
1608 * @host: mmc host
1609 */
1610 int mmc_resume_host(struct mmc_host *host)
1611 {
1612 mmc_rescan(&host->detect.work);
1613
1614 return 0;
1615 }
1616
1617 EXPORT_SYMBOL(mmc_resume_host);
1618
1619 #endif
1620
1621 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree