2 * linux/drivers/mmc/mmc.c
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.
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.
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>
24 #include <linux/mmc/card.h>
25 #include <linux/mmc/host.h>
26 #include <linux/mmc/protocol.h>
33 * OCR Bit positions to 10s of Vdd mV.
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
41 static const unsigned int tran_exp[] = {
42 10000, 100000, 1000000, 10000000,
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,
51 static const unsigned int tacc_exp[] = {
52 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
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,
62 * mmc_request_done - finish processing an MMC request
63 * @host: MMC host which completed request
64 * @mrq: MMC request which request
66 * MMC drivers should call this function when they have completed
67 * their processing of a request.
69 void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
71 struct mmc_command *cmd = mrq->cmd;
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]);
80 if (err && cmd->retries) {
83 host->ops->request(host, mrq);
84 } else if (mrq->done) {
89 EXPORT_SYMBOL(mmc_request_done);
92 * mmc_start_request - start a command on a host
93 * @host: MMC host to start command on
94 * @mrq: MMC request to start
96 * Queue a command on the specified host. We expect the
97 * caller to be holding the host lock with interrupts disabled.
100 mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
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);
106 WARN_ON(!host->claimed);
111 BUG_ON(mrq->data->blksz > host->max_blk_size);
112 BUG_ON(mrq->data->blocks > host->max_blk_count);
113 BUG_ON(mrq->data->blocks * mrq->data->blksz >
116 mrq->cmd->data = mrq->data;
117 mrq->data->error = 0;
118 mrq->data->mrq = mrq;
120 mrq->data->stop = mrq->stop;
121 mrq->stop->error = 0;
122 mrq->stop->mrq = mrq;
125 host->ops->request(host, mrq);
128 EXPORT_SYMBOL(mmc_start_request);
130 static void mmc_wait_done(struct mmc_request *mrq)
132 complete(mrq->done_data);
135 int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
137 DECLARE_COMPLETION_ONSTACK(complete);
139 mrq->done_data = &complete;
140 mrq->done = mmc_wait_done;
142 mmc_start_request(host, mrq);
144 wait_for_completion(&complete);
149 EXPORT_SYMBOL(mmc_wait_for_req);
152 * mmc_wait_for_cmd - start a command and wait for completion
153 * @host: MMC host to start command
154 * @cmd: MMC command to start
155 * @retries: maximum number of retries
157 * Start a new MMC command for a host, and wait for the command
158 * to complete. Return any error that occurred while the command
159 * was executing. Do not attempt to parse the response.
161 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
163 struct mmc_request mrq;
165 BUG_ON(!host->claimed);
167 memset(&mrq, 0, sizeof(struct mmc_request));
169 memset(cmd->resp, 0, sizeof(cmd->resp));
170 cmd->retries = retries;
175 mmc_wait_for_req(host, &mrq);
180 EXPORT_SYMBOL(mmc_wait_for_cmd);
183 * mmc_wait_for_app_cmd - start an application command and wait for
185 * @host: MMC host to start command
186 * @rca: RCA to send MMC_APP_CMD to
187 * @cmd: MMC command to start
188 * @retries: maximum number of retries
190 * Sends a MMC_APP_CMD, checks the card response, sends the command
191 * in the parameter and waits for it to complete. Return any error
192 * that occurred while the command was executing. Do not attempt to
193 * parse the response.
195 int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca,
196 struct mmc_command *cmd, int retries)
198 struct mmc_request mrq;
199 struct mmc_command appcmd;
203 BUG_ON(!host->claimed);
206 err = MMC_ERR_INVALID;
209 * We have to resend MMC_APP_CMD for each attempt so
210 * we cannot use the retries field in mmc_command.
212 for (i = 0;i <= retries;i++) {
213 memset(&mrq, 0, sizeof(struct mmc_request));
215 appcmd.opcode = MMC_APP_CMD;
216 appcmd.arg = rca << 16;
217 appcmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
219 memset(appcmd.resp, 0, sizeof(appcmd.resp));
225 mmc_wait_for_req(host, &mrq);
232 /* Check that card supported application commands */
233 if (!(appcmd.resp[0] & R1_APP_CMD))
234 return MMC_ERR_FAILED;
236 memset(&mrq, 0, sizeof(struct mmc_request));
238 memset(cmd->resp, 0, sizeof(cmd->resp));
244 mmc_wait_for_req(host, &mrq);
247 if (cmd->error == MMC_ERR_NONE)
254 EXPORT_SYMBOL(mmc_wait_for_app_cmd);
257 * mmc_set_data_timeout - set the timeout for a data command
258 * @data: data phase for command
259 * @card: the MMC card associated with the data transfer
260 * @write: flag to differentiate reads from writes
262 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card,
268 * SD cards use a 100 multiplier rather than 10
270 mult = mmc_card_sd(card) ? 100 : 10;
273 * Scale up the multiplier (and therefore the timeout) by
274 * the r2w factor for writes.
277 mult <<= card->csd.r2w_factor;
279 data->timeout_ns = card->csd.tacc_ns * mult;
280 data->timeout_clks = card->csd.tacc_clks * mult;
283 * SD cards also have an upper limit on the timeout.
285 if (mmc_card_sd(card)) {
286 unsigned int timeout_us, limit_us;
288 timeout_us = data->timeout_ns / 1000;
289 timeout_us += data->timeout_clks * 1000 /
290 (card->host->ios.clock / 1000);
298 * SDHC cards always use these fixed values.
300 if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
301 data->timeout_ns = limit_us * 1000;
302 data->timeout_clks = 0;
306 EXPORT_SYMBOL(mmc_set_data_timeout);
308 static int mmc_select_card(struct mmc_host *host, struct mmc_card *card);
311 * __mmc_claim_host - exclusively claim a host
312 * @host: mmc host to claim
313 * @card: mmc card to claim host for
315 * Claim a host for a set of operations. If a valid card
316 * is passed and this wasn't the last card selected, select
317 * the card before returning.
319 * Note: you should use mmc_card_claim_host or mmc_claim_host.
321 int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card)
323 DECLARE_WAITQUEUE(wait, current);
327 add_wait_queue(&host->wq, &wait);
328 spin_lock_irqsave(&host->lock, flags);
330 set_current_state(TASK_UNINTERRUPTIBLE);
333 spin_unlock_irqrestore(&host->lock, flags);
335 spin_lock_irqsave(&host->lock, flags);
337 set_current_state(TASK_RUNNING);
339 spin_unlock_irqrestore(&host->lock, flags);
340 remove_wait_queue(&host->wq, &wait);
342 if (card != (void *)-1) {
343 err = mmc_select_card(host, card);
344 if (err != MMC_ERR_NONE)
351 EXPORT_SYMBOL(__mmc_claim_host);
354 * mmc_release_host - release a host
355 * @host: mmc host to release
357 * Release a MMC host, allowing others to claim the host
358 * for their operations.
360 void mmc_release_host(struct mmc_host *host)
364 BUG_ON(!host->claimed);
366 spin_lock_irqsave(&host->lock, flags);
368 spin_unlock_irqrestore(&host->lock, flags);
373 EXPORT_SYMBOL(mmc_release_host);
375 static inline void mmc_set_ios(struct mmc_host *host)
377 struct mmc_ios *ios = &host->ios;
379 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u width %u\n",
380 mmc_hostname(host), ios->clock, ios->bus_mode,
381 ios->power_mode, ios->chip_select, ios->vdd,
384 host->ops->set_ios(host, ios);
387 static int mmc_select_card(struct mmc_host *host, struct mmc_card *card)
390 struct mmc_command cmd;
392 BUG_ON(!host->claimed);
394 if (host->card_selected == card)
397 host->card_selected = card;
399 cmd.opcode = MMC_SELECT_CARD;
400 cmd.arg = card->rca << 16;
401 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
403 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
404 if (err != MMC_ERR_NONE)
408 * We can only change the bus width of SD cards when
409 * they are selected so we have to put the handling
412 * The card is in 1 bit mode by default so
413 * we only need to change if it supports the
416 if (mmc_card_sd(card) &&
417 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
420 * Default bus width is 1 bit.
422 host->ios.bus_width = MMC_BUS_WIDTH_1;
424 if (host->caps & MMC_CAP_4_BIT_DATA) {
425 struct mmc_command cmd;
426 cmd.opcode = SD_APP_SET_BUS_WIDTH;
427 cmd.arg = SD_BUS_WIDTH_4;
428 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
430 err = mmc_wait_for_app_cmd(host, card->rca, &cmd,
432 if (err != MMC_ERR_NONE)
435 host->ios.bus_width = MMC_BUS_WIDTH_4;
445 * Ensure that no card is selected.
447 static void mmc_deselect_cards(struct mmc_host *host)
449 struct mmc_command cmd;
451 if (host->card_selected) {
452 host->card_selected = NULL;
454 cmd.opcode = MMC_SELECT_CARD;
456 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
458 mmc_wait_for_cmd(host, &cmd, 0);
463 static inline void mmc_delay(unsigned int ms)
465 if (ms < 1000 / HZ) {
474 * Mask off any voltages we don't support and select
477 static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
481 ocr &= host->ocr_avail;
498 #define UNSTUFF_BITS(resp,start,size) \
500 const int __size = size; \
501 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
502 const int __off = 3 - ((start) / 32); \
503 const int __shft = (start) & 31; \
506 __res = resp[__off] >> __shft; \
507 if (__size + __shft > 32) \
508 __res |= resp[__off-1] << ((32 - __shft) % 32); \
513 * Given the decoded CSD structure, decode the raw CID to our CID structure.
515 static void mmc_decode_cid(struct mmc_card *card)
517 u32 *resp = card->raw_cid;
519 memset(&card->cid, 0, sizeof(struct mmc_cid));
521 if (mmc_card_sd(card)) {
523 * SD doesn't currently have a version field so we will
524 * have to assume we can parse this.
526 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
527 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
528 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
529 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
530 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
531 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
532 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
533 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
534 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
535 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
536 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
537 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
539 card->cid.year += 2000; /* SD cards year offset */
542 * The selection of the format here is based upon published
543 * specs from sandisk and from what people have reported.
545 switch (card->csd.mmca_vsn) {
546 case 0: /* MMC v1.0 - v1.2 */
547 case 1: /* MMC v1.4 */
548 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
549 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
550 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
551 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
552 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
553 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
554 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
555 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
556 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
557 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
558 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
559 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
560 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
563 case 2: /* MMC v2.0 - v2.2 */
564 case 3: /* MMC v3.1 - v3.3 */
566 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
567 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
568 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
569 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
570 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
571 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
572 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
573 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
574 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
575 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
576 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
580 printk("%s: card has unknown MMCA version %d\n",
581 mmc_hostname(card->host), card->csd.mmca_vsn);
582 mmc_card_set_bad(card);
589 * Given a 128-bit response, decode to our card CSD structure.
591 static void mmc_decode_csd(struct mmc_card *card)
593 struct mmc_csd *csd = &card->csd;
594 unsigned int e, m, csd_struct;
595 u32 *resp = card->raw_csd;
597 if (mmc_card_sd(card)) {
598 csd_struct = UNSTUFF_BITS(resp, 126, 2);
600 switch (csd_struct) {
602 m = UNSTUFF_BITS(resp, 115, 4);
603 e = UNSTUFF_BITS(resp, 112, 3);
604 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
605 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
607 m = UNSTUFF_BITS(resp, 99, 4);
608 e = UNSTUFF_BITS(resp, 96, 3);
609 csd->max_dtr = tran_exp[e] * tran_mant[m];
610 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
612 e = UNSTUFF_BITS(resp, 47, 3);
613 m = UNSTUFF_BITS(resp, 62, 12);
614 csd->capacity = (1 + m) << (e + 2);
616 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
617 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
618 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
619 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
620 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
621 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
622 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
626 * This is a block-addressed SDHC card. Most
627 * interesting fields are unused and have fixed
628 * values. To avoid getting tripped by buggy cards,
629 * we assume those fixed values ourselves.
631 mmc_card_set_blockaddr(card);
633 csd->tacc_ns = 0; /* Unused */
634 csd->tacc_clks = 0; /* Unused */
636 m = UNSTUFF_BITS(resp, 99, 4);
637 e = UNSTUFF_BITS(resp, 96, 3);
638 csd->max_dtr = tran_exp[e] * tran_mant[m];
639 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
641 m = UNSTUFF_BITS(resp, 48, 22);
642 csd->capacity = (1 + m) << 10;
644 csd->read_blkbits = 9;
645 csd->read_partial = 0;
646 csd->write_misalign = 0;
647 csd->read_misalign = 0;
648 csd->r2w_factor = 4; /* Unused */
649 csd->write_blkbits = 9;
650 csd->write_partial = 0;
653 printk("%s: unrecognised CSD structure version %d\n",
654 mmc_hostname(card->host), csd_struct);
655 mmc_card_set_bad(card);
660 * We only understand CSD structure v1.1 and v1.2.
661 * v1.2 has extra information in bits 15, 11 and 10.
663 csd_struct = UNSTUFF_BITS(resp, 126, 2);
664 if (csd_struct != 1 && csd_struct != 2) {
665 printk("%s: unrecognised CSD structure version %d\n",
666 mmc_hostname(card->host), csd_struct);
667 mmc_card_set_bad(card);
671 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
672 m = UNSTUFF_BITS(resp, 115, 4);
673 e = UNSTUFF_BITS(resp, 112, 3);
674 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
675 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
677 m = UNSTUFF_BITS(resp, 99, 4);
678 e = UNSTUFF_BITS(resp, 96, 3);
679 csd->max_dtr = tran_exp[e] * tran_mant[m];
680 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
682 e = UNSTUFF_BITS(resp, 47, 3);
683 m = UNSTUFF_BITS(resp, 62, 12);
684 csd->capacity = (1 + m) << (e + 2);
686 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
687 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
688 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
689 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
690 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
691 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
692 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
697 * Given a 64-bit response, decode to our card SCR structure.
699 static void mmc_decode_scr(struct mmc_card *card)
701 struct sd_scr *scr = &card->scr;
702 unsigned int scr_struct;
705 BUG_ON(!mmc_card_sd(card));
707 resp[3] = card->raw_scr[1];
708 resp[2] = card->raw_scr[0];
710 scr_struct = UNSTUFF_BITS(resp, 60, 4);
711 if (scr_struct != 0) {
712 printk("%s: unrecognised SCR structure version %d\n",
713 mmc_hostname(card->host), scr_struct);
714 mmc_card_set_bad(card);
718 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
719 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
723 * Locate a MMC card on this MMC host given a raw CID.
725 static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid)
727 struct mmc_card *card;
729 list_for_each_entry(card, &host->cards, node) {
730 if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0)
737 * Allocate a new MMC card, and assign a unique RCA.
739 static struct mmc_card *
740 mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca)
742 struct mmc_card *card, *c;
743 unsigned int rca = *frca;
745 card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL);
747 return ERR_PTR(-ENOMEM);
749 mmc_init_card(card, host);
750 memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid));
753 list_for_each_entry(c, &host->cards, node)
767 * Tell attached cards to go to IDLE state
769 static void mmc_idle_cards(struct mmc_host *host)
771 struct mmc_command cmd;
773 host->ios.chip_select = MMC_CS_HIGH;
778 cmd.opcode = MMC_GO_IDLE_STATE;
780 cmd.flags = MMC_RSP_NONE | MMC_CMD_BC;
782 mmc_wait_for_cmd(host, &cmd, 0);
786 host->ios.chip_select = MMC_CS_DONTCARE;
793 * Apply power to the MMC stack. This is a two-stage process.
794 * First, we enable power to the card without the clock running.
795 * We then wait a bit for the power to stabilise. Finally,
796 * enable the bus drivers and clock to the card.
798 * We must _NOT_ enable the clock prior to power stablising.
800 * If a host does all the power sequencing itself, ignore the
801 * initial MMC_POWER_UP stage.
803 static void mmc_power_up(struct mmc_host *host)
805 int bit = fls(host->ocr_avail) - 1;
808 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
809 host->ios.chip_select = MMC_CS_DONTCARE;
810 host->ios.power_mode = MMC_POWER_UP;
811 host->ios.bus_width = MMC_BUS_WIDTH_1;
816 host->ios.clock = host->f_min;
817 host->ios.power_mode = MMC_POWER_ON;
823 static void mmc_power_off(struct mmc_host *host)
827 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
828 host->ios.chip_select = MMC_CS_DONTCARE;
829 host->ios.power_mode = MMC_POWER_OFF;
830 host->ios.bus_width = MMC_BUS_WIDTH_1;
834 static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
836 struct mmc_command cmd;
839 cmd.opcode = MMC_SEND_OP_COND;
841 cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
843 for (i = 100; i; i--) {
844 err = mmc_wait_for_cmd(host, &cmd, 0);
845 if (err != MMC_ERR_NONE)
848 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
851 err = MMC_ERR_TIMEOUT;
862 static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
864 struct mmc_command cmd;
867 cmd.opcode = SD_APP_OP_COND;
869 cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
871 for (i = 100; i; i--) {
872 err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES);
873 if (err != MMC_ERR_NONE)
876 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
879 err = MMC_ERR_TIMEOUT;
890 static int mmc_send_if_cond(struct mmc_host *host, u32 ocr, int *rsd2)
892 struct mmc_command cmd;
894 static const u8 test_pattern = 0xAA;
897 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
898 * before SD_APP_OP_COND. This command will harmlessly fail for
901 cmd.opcode = SD_SEND_IF_COND;
902 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
903 cmd.flags = MMC_RSP_R7 | MMC_CMD_BCR;
905 err = mmc_wait_for_cmd(host, &cmd, 0);
906 if (err == MMC_ERR_NONE) {
907 if ((cmd.resp[0] & 0xFF) == test_pattern) {
911 err = MMC_ERR_FAILED;
915 * Treat errors as SD 1.0 card.
926 * Discover cards by requesting their CID. If this command
927 * times out, it is not an error; there are no further cards
928 * to be discovered. Add new cards to the list.
930 * Create a mmc_card entry for each discovered card, assigning
931 * it an RCA, and save the raw CID for decoding later.
933 static void mmc_discover_cards(struct mmc_host *host)
935 struct mmc_card *card;
936 unsigned int first_rca = 1, err;
939 struct mmc_command cmd;
941 cmd.opcode = MMC_ALL_SEND_CID;
943 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
945 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
946 if (err == MMC_ERR_TIMEOUT) {
950 if (err != MMC_ERR_NONE) {
951 printk(KERN_ERR "%s: error requesting CID: %d\n",
952 mmc_hostname(host), err);
956 card = mmc_find_card(host, cmd.resp);
958 card = mmc_alloc_card(host, cmd.resp, &first_rca);
963 list_add(&card->node, &host->cards);
966 card->state &= ~MMC_STATE_DEAD;
968 if (host->mode == MMC_MODE_SD) {
969 mmc_card_set_sd(card);
971 cmd.opcode = SD_SEND_RELATIVE_ADDR;
973 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
975 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
976 if (err != MMC_ERR_NONE)
977 mmc_card_set_dead(card);
979 card->rca = cmd.resp[0] >> 16;
981 if (!host->ops->get_ro) {
982 printk(KERN_WARNING "%s: host does not "
983 "support reading read-only "
984 "switch. assuming write-enable.\n",
987 if (host->ops->get_ro(host))
988 mmc_card_set_readonly(card);
992 cmd.opcode = MMC_SET_RELATIVE_ADDR;
993 cmd.arg = card->rca << 16;
994 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
996 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
997 if (err != MMC_ERR_NONE)
998 mmc_card_set_dead(card);
1003 static void mmc_read_csds(struct mmc_host *host)
1005 struct mmc_card *card;
1007 list_for_each_entry(card, &host->cards, node) {
1008 struct mmc_command cmd;
1011 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
1014 cmd.opcode = MMC_SEND_CSD;
1015 cmd.arg = card->rca << 16;
1016 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
1018 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1019 if (err != MMC_ERR_NONE) {
1020 mmc_card_set_dead(card);
1024 memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd));
1026 mmc_decode_csd(card);
1027 mmc_decode_cid(card);
1031 static void mmc_process_ext_csds(struct mmc_host *host)
1034 struct mmc_card *card;
1036 struct mmc_request mrq;
1037 struct mmc_command cmd;
1038 struct mmc_data data;
1040 struct scatterlist sg;
1043 * As the ext_csd is so large and mostly unused, we don't store the
1044 * raw block in mmc_card.
1047 ext_csd = kmalloc(512, GFP_KERNEL);
1049 printk("%s: could not allocate a buffer to receive the ext_csd."
1050 "mmc v4 cards will be treated as v3.\n",
1051 mmc_hostname(host));
1055 list_for_each_entry(card, &host->cards, node) {
1056 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
1058 if (mmc_card_sd(card))
1060 if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
1063 err = mmc_select_card(host, card);
1064 if (err != MMC_ERR_NONE) {
1065 mmc_card_set_dead(card);
1069 memset(&cmd, 0, sizeof(struct mmc_command));
1071 cmd.opcode = MMC_SEND_EXT_CSD;
1073 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1075 memset(&data, 0, sizeof(struct mmc_data));
1077 mmc_set_data_timeout(&data, card, 0);
1081 data.flags = MMC_DATA_READ;
1085 memset(&mrq, 0, sizeof(struct mmc_request));
1090 sg_init_one(&sg, ext_csd, 512);
1092 mmc_wait_for_req(host, &mrq);
1094 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
1095 printk("%s: unable to read EXT_CSD, performance "
1096 "might suffer.\n", mmc_hostname(card->host));
1100 switch (ext_csd[EXT_CSD_CARD_TYPE]) {
1101 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
1102 card->ext_csd.hs_max_dtr = 52000000;
1104 case EXT_CSD_CARD_TYPE_26:
1105 card->ext_csd.hs_max_dtr = 26000000;
1108 /* MMC v4 spec says this cannot happen */
1109 printk("%s: card is mmc v4 but doesn't support "
1110 "any high-speed modes.\n",
1111 mmc_hostname(card->host));
1115 /* Activate highspeed support. */
1116 cmd.opcode = MMC_SWITCH;
1117 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
1118 (EXT_CSD_HS_TIMING << 16) |
1120 EXT_CSD_CMD_SET_NORMAL;
1121 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1123 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1124 if (err != MMC_ERR_NONE) {
1125 printk("%s: failed to switch card to mmc v4 "
1126 "high-speed mode.\n",
1127 mmc_hostname(card->host));
1131 mmc_card_set_highspeed(card);
1133 /* Check for host support for wide-bus modes. */
1134 if (!(host->caps & MMC_CAP_4_BIT_DATA)) {
1138 /* Activate 4-bit support. */
1139 cmd.opcode = MMC_SWITCH;
1140 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
1141 (EXT_CSD_BUS_WIDTH << 16) |
1142 (EXT_CSD_BUS_WIDTH_4 << 8) |
1143 EXT_CSD_CMD_SET_NORMAL;
1144 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1146 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1147 if (err != MMC_ERR_NONE) {
1148 printk("%s: failed to switch card to "
1149 "mmc v4 4-bit bus mode.\n",
1150 mmc_hostname(card->host));
1154 host->ios.bus_width = MMC_BUS_WIDTH_4;
1159 mmc_deselect_cards(host);
1162 static void mmc_read_scrs(struct mmc_host *host)
1165 struct mmc_card *card;
1166 struct mmc_request mrq;
1167 struct mmc_command cmd;
1168 struct mmc_data data;
1169 struct scatterlist sg;
1171 list_for_each_entry(card, &host->cards, node) {
1172 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
1174 if (!mmc_card_sd(card))
1177 err = mmc_select_card(host, card);
1178 if (err != MMC_ERR_NONE) {
1179 mmc_card_set_dead(card);
1183 memset(&cmd, 0, sizeof(struct mmc_command));
1185 cmd.opcode = MMC_APP_CMD;
1186 cmd.arg = card->rca << 16;
1187 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1189 err = mmc_wait_for_cmd(host, &cmd, 0);
1190 if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) {
1191 mmc_card_set_dead(card);
1195 memset(&cmd, 0, sizeof(struct mmc_command));
1197 cmd.opcode = SD_APP_SEND_SCR;
1199 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1201 memset(&data, 0, sizeof(struct mmc_data));
1203 mmc_set_data_timeout(&data, card, 0);
1205 data.blksz = 1 << 3;
1207 data.flags = MMC_DATA_READ;
1211 memset(&mrq, 0, sizeof(struct mmc_request));
1216 sg_init_one(&sg, (u8*)card->raw_scr, 8);
1218 mmc_wait_for_req(host, &mrq);
1220 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
1221 mmc_card_set_dead(card);
1225 card->raw_scr[0] = ntohl(card->raw_scr[0]);
1226 card->raw_scr[1] = ntohl(card->raw_scr[1]);
1228 mmc_decode_scr(card);
1231 mmc_deselect_cards(host);
1234 static void mmc_read_switch_caps(struct mmc_host *host)
1237 struct mmc_card *card;
1238 struct mmc_request mrq;
1239 struct mmc_command cmd;
1240 struct mmc_data data;
1241 unsigned char *status;
1242 struct scatterlist sg;
1244 status = kmalloc(64, GFP_KERNEL);
1246 printk(KERN_WARNING "%s: Unable to allocate buffer for "
1247 "reading switch capabilities.\n",
1248 mmc_hostname(host));
1252 list_for_each_entry(card, &host->cards, node) {
1253 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
1255 if (!mmc_card_sd(card))
1257 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
1260 err = mmc_select_card(host, card);
1261 if (err != MMC_ERR_NONE) {
1262 mmc_card_set_dead(card);
1266 memset(&cmd, 0, sizeof(struct mmc_command));
1268 cmd.opcode = SD_SWITCH;
1269 cmd.arg = 0x00FFFFF1;
1270 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1272 memset(&data, 0, sizeof(struct mmc_data));
1274 mmc_set_data_timeout(&data, card, 0);
1278 data.flags = MMC_DATA_READ;
1282 memset(&mrq, 0, sizeof(struct mmc_request));
1287 sg_init_one(&sg, status, 64);
1289 mmc_wait_for_req(host, &mrq);
1291 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
1292 printk("%s: unable to read switch capabilities, "
1293 "performance might suffer.\n",
1294 mmc_hostname(card->host));
1298 if (status[13] & 0x02)
1299 card->sw_caps.hs_max_dtr = 50000000;
1301 memset(&cmd, 0, sizeof(struct mmc_command));
1303 cmd.opcode = SD_SWITCH;
1304 cmd.arg = 0x80FFFFF1;
1305 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1307 memset(&data, 0, sizeof(struct mmc_data));
1309 mmc_set_data_timeout(&data, card, 0);
1313 data.flags = MMC_DATA_READ;
1317 memset(&mrq, 0, sizeof(struct mmc_request));
1322 sg_init_one(&sg, status, 64);
1324 mmc_wait_for_req(host, &mrq);
1326 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE ||
1327 (status[16] & 0xF) != 1) {
1328 printk(KERN_WARNING "%s: Problem switching card "
1329 "into high-speed mode!\n",
1330 mmc_hostname(host));
1334 mmc_card_set_highspeed(card);
1339 mmc_deselect_cards(host);
1342 static unsigned int mmc_calculate_clock(struct mmc_host *host)
1344 struct mmc_card *card;
1345 unsigned int max_dtr = host->f_max;
1347 list_for_each_entry(card, &host->cards, node)
1348 if (!mmc_card_dead(card)) {
1349 if (mmc_card_highspeed(card) && mmc_card_sd(card)) {
1350 if (max_dtr > card->sw_caps.hs_max_dtr)
1351 max_dtr = card->sw_caps.hs_max_dtr;
1352 } else if (mmc_card_highspeed(card) && !mmc_card_sd(card)) {
1353 if (max_dtr > card->ext_csd.hs_max_dtr)
1354 max_dtr = card->ext_csd.hs_max_dtr;
1355 } else if (max_dtr > card->csd.max_dtr) {
1356 max_dtr = card->csd.max_dtr;
1360 pr_debug("%s: selected %d.%03dMHz transfer rate\n",
1362 max_dtr / 1000000, (max_dtr / 1000) % 1000);
1368 * Check whether cards we already know about are still present.
1369 * We do this by requesting status, and checking whether a card
1372 * A request for status does not cause a state change in data
1375 static void mmc_check_cards(struct mmc_host *host)
1377 struct list_head *l, *n;
1379 mmc_deselect_cards(host);
1381 list_for_each_safe(l, n, &host->cards) {
1382 struct mmc_card *card = mmc_list_to_card(l);
1383 struct mmc_command cmd;
1386 cmd.opcode = MMC_SEND_STATUS;
1387 cmd.arg = card->rca << 16;
1388 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1390 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1391 if (err == MMC_ERR_NONE)
1394 mmc_card_set_dead(card);
1398 static void mmc_setup(struct mmc_host *host)
1400 if (host->ios.power_mode != MMC_POWER_ON) {
1404 host->mode = MMC_MODE_SD;
1407 mmc_idle_cards(host);
1409 err = mmc_send_if_cond(host, host->ocr_avail, NULL);
1410 if (err != MMC_ERR_NONE) {
1413 err = mmc_send_app_op_cond(host, 0, &ocr);
1416 * If we fail to detect any SD cards then try
1417 * searching for MMC cards.
1419 if (err != MMC_ERR_NONE) {
1420 host->mode = MMC_MODE_MMC;
1422 err = mmc_send_op_cond(host, 0, &ocr);
1423 if (err != MMC_ERR_NONE)
1427 host->ocr = mmc_select_voltage(host, ocr);
1430 * Since we're changing the OCR value, we seem to
1431 * need to tell some cards to go back to the idle
1432 * state. We wait 1ms to give cards time to
1436 mmc_idle_cards(host);
1438 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1439 host->ios.clock = host->f_min;
1443 * We should remember the OCR mask from the existing
1444 * cards, and detect the new cards OCR mask, combine
1445 * the two and re-select the VDD. However, if we do
1446 * change VDD, we should do an idle, and then do a
1447 * full re-initialisation. We would need to notify
1448 * drivers so that they can re-setup the cards as
1449 * well, while keeping their queues at bay.
1451 * For the moment, we take the easy way out - if the
1452 * new cards don't like our currently selected VDD,
1453 * they drop off the bus.
1461 * Send the selected OCR multiple times... until the cards
1462 * all get the idea that they should be ready for CMD2.
1463 * (My SanDisk card seems to need this.)
1465 if (host->mode == MMC_MODE_SD) {
1467 err = mmc_send_if_cond(host, host->ocr, &sd2);
1468 if (err == MMC_ERR_NONE) {
1470 * If SD_SEND_IF_COND indicates an SD 2.0
1471 * compliant card and we should set bit 30
1472 * of the ocr to indicate that we can handle
1473 * block-addressed SDHC cards.
1475 mmc_send_app_op_cond(host, host->ocr | (sd2 << 30), NULL);
1478 mmc_send_op_cond(host, host->ocr, NULL);
1481 mmc_discover_cards(host);
1484 * Ok, now switch to push-pull mode.
1486 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1489 mmc_read_csds(host);
1491 if (host->mode == MMC_MODE_SD) {
1492 mmc_read_scrs(host);
1493 mmc_read_switch_caps(host);
1495 mmc_process_ext_csds(host);
1500 * mmc_detect_change - process change of state on a MMC socket
1501 * @host: host which changed state.
1502 * @delay: optional delay to wait before detection (jiffies)
1504 * All we know is that card(s) have been inserted or removed
1505 * from the socket(s). We don't know which socket or cards.
1507 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1509 mmc_schedule_delayed_work(&host->detect, delay);
1512 EXPORT_SYMBOL(mmc_detect_change);
1515 static void mmc_rescan(struct work_struct *work)
1517 struct mmc_host *host =
1518 container_of(work, struct mmc_host, detect.work);
1519 struct list_head *l, *n;
1520 unsigned char power_mode;
1522 mmc_claim_host(host);
1525 * Check for removed cards and newly inserted ones. We check for
1526 * removed cards first so we can intelligently re-select the VDD.
1528 power_mode = host->ios.power_mode;
1529 if (power_mode == MMC_POWER_ON)
1530 mmc_check_cards(host);
1535 * Some broken cards process CMD1 even in stand-by state. There is
1536 * no reply, but an ILLEGAL_COMMAND error is cached and returned
1537 * after next command. We poll for card status here to clear any
1538 * possibly pending error.
1540 if (power_mode == MMC_POWER_ON)
1541 mmc_check_cards(host);
1543 if (!list_empty(&host->cards)) {
1545 * (Re-)calculate the fastest clock rate which the
1546 * attached cards and the host support.
1548 host->ios.clock = mmc_calculate_clock(host);
1552 mmc_release_host(host);
1554 list_for_each_safe(l, n, &host->cards) {
1555 struct mmc_card *card = mmc_list_to_card(l);
1558 * If this is a new and good card, register it.
1560 if (!mmc_card_present(card) && !mmc_card_dead(card)) {
1561 if (mmc_register_card(card))
1562 mmc_card_set_dead(card);
1564 mmc_card_set_present(card);
1568 * If this card is dead, destroy it.
1570 if (mmc_card_dead(card)) {
1571 list_del(&card->node);
1572 mmc_remove_card(card);
1577 * If we discover that there are no cards on the
1578 * bus, turn off the clock and power down.
1580 if (list_empty(&host->cards))
1581 mmc_power_off(host);
1586 * mmc_alloc_host - initialise the per-host structure.
1587 * @extra: sizeof private data structure
1588 * @dev: pointer to host device model structure
1590 * Initialise the per-host structure.
1592 struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
1594 struct mmc_host *host;
1596 host = mmc_alloc_host_sysfs(extra, dev);
1598 spin_lock_init(&host->lock);
1599 init_waitqueue_head(&host->wq);
1600 INIT_LIST_HEAD(&host->cards);
1601 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
1604 * By default, hosts do not support SGIO or large requests.
1605 * They have to set these according to their abilities.
1607 host->max_hw_segs = 1;
1608 host->max_phys_segs = 1;
1609 host->max_seg_size = PAGE_CACHE_SIZE;
1611 host->max_req_size = PAGE_CACHE_SIZE;
1612 host->max_blk_size = 512;
1613 host->max_blk_count = PAGE_CACHE_SIZE / 512;
1619 EXPORT_SYMBOL(mmc_alloc_host);
1622 * mmc_add_host - initialise host hardware
1625 int mmc_add_host(struct mmc_host *host)
1629 ret = mmc_add_host_sysfs(host);
1631 mmc_power_off(host);
1632 mmc_detect_change(host, 0);
1638 EXPORT_SYMBOL(mmc_add_host);
1641 * mmc_remove_host - remove host hardware
1644 * Unregister and remove all cards associated with this host,
1645 * and power down the MMC bus.
1647 void mmc_remove_host(struct mmc_host *host)
1649 struct list_head *l, *n;
1651 list_for_each_safe(l, n, &host->cards) {
1652 struct mmc_card *card = mmc_list_to_card(l);
1654 mmc_remove_card(card);
1657 mmc_power_off(host);
1658 mmc_remove_host_sysfs(host);
1661 EXPORT_SYMBOL(mmc_remove_host);
1664 * mmc_free_host - free the host structure
1667 * Free the host once all references to it have been dropped.
1669 void mmc_free_host(struct mmc_host *host)
1671 mmc_flush_scheduled_work();
1672 mmc_free_host_sysfs(host);
1675 EXPORT_SYMBOL(mmc_free_host);
1680 * mmc_suspend_host - suspend a host
1682 * @state: suspend mode (PM_SUSPEND_xxx)
1684 int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
1686 mmc_claim_host(host);
1687 mmc_deselect_cards(host);
1688 mmc_power_off(host);
1689 mmc_release_host(host);
1694 EXPORT_SYMBOL(mmc_suspend_host);
1697 * mmc_resume_host - resume a previously suspended host
1700 int mmc_resume_host(struct mmc_host *host)
1702 mmc_rescan(&host->detect.work);
1707 EXPORT_SYMBOL(mmc_resume_host);
1711 MODULE_LICENSE("GPL");