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 "
380 "width %u timing %u\n",
381 mmc_hostname(host), ios->clock, ios->bus_mode,
382 ios->power_mode, ios->chip_select, ios->vdd,
383 ios->bus_width, ios->timing);
385 host->ops->set_ios(host, ios);
388 static int mmc_select_card(struct mmc_host *host, struct mmc_card *card)
391 struct mmc_command cmd;
393 BUG_ON(!host->claimed);
395 if (host->card_selected == card)
398 host->card_selected = card;
400 cmd.opcode = MMC_SELECT_CARD;
401 cmd.arg = card->rca << 16;
402 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
404 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
405 if (err != MMC_ERR_NONE)
409 * We can only change the bus width of SD cards when
410 * they are selected so we have to put the handling
413 * The card is in 1 bit mode by default so
414 * we only need to change if it supports the
417 if (mmc_card_sd(card) &&
418 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
421 * Default bus width is 1 bit.
423 host->ios.bus_width = MMC_BUS_WIDTH_1;
425 if (host->caps & MMC_CAP_4_BIT_DATA) {
426 struct mmc_command cmd;
427 cmd.opcode = SD_APP_SET_BUS_WIDTH;
428 cmd.arg = SD_BUS_WIDTH_4;
429 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
431 err = mmc_wait_for_app_cmd(host, card->rca, &cmd,
433 if (err != MMC_ERR_NONE)
436 host->ios.bus_width = MMC_BUS_WIDTH_4;
446 * Ensure that no card is selected.
448 static void mmc_deselect_cards(struct mmc_host *host)
450 struct mmc_command cmd;
452 if (host->card_selected) {
453 host->card_selected = NULL;
455 cmd.opcode = MMC_SELECT_CARD;
457 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
459 mmc_wait_for_cmd(host, &cmd, 0);
464 static inline void mmc_delay(unsigned int ms)
466 if (ms < 1000 / HZ) {
475 * Mask off any voltages we don't support and select
478 static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
482 ocr &= host->ocr_avail;
499 #define UNSTUFF_BITS(resp,start,size) \
501 const int __size = size; \
502 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
503 const int __off = 3 - ((start) / 32); \
504 const int __shft = (start) & 31; \
507 __res = resp[__off] >> __shft; \
508 if (__size + __shft > 32) \
509 __res |= resp[__off-1] << ((32 - __shft) % 32); \
514 * Given the decoded CSD structure, decode the raw CID to our CID structure.
516 static void mmc_decode_cid(struct mmc_card *card)
518 u32 *resp = card->raw_cid;
520 memset(&card->cid, 0, sizeof(struct mmc_cid));
522 if (mmc_card_sd(card)) {
524 * SD doesn't currently have a version field so we will
525 * have to assume we can parse this.
527 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
528 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
529 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
530 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
531 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
532 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
533 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
534 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
535 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
536 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
537 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
538 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
540 card->cid.year += 2000; /* SD cards year offset */
543 * The selection of the format here is based upon published
544 * specs from sandisk and from what people have reported.
546 switch (card->csd.mmca_vsn) {
547 case 0: /* MMC v1.0 - v1.2 */
548 case 1: /* MMC v1.4 */
549 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
550 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
551 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
552 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
553 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
554 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
555 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
556 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
557 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
558 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
559 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
560 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
561 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
564 case 2: /* MMC v2.0 - v2.2 */
565 case 3: /* MMC v3.1 - v3.3 */
567 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
568 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
569 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
570 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
571 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
572 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
573 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
574 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
575 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
576 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
577 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
581 printk("%s: card has unknown MMCA version %d\n",
582 mmc_hostname(card->host), card->csd.mmca_vsn);
583 mmc_card_set_bad(card);
590 * Given a 128-bit response, decode to our card CSD structure.
592 static void mmc_decode_csd(struct mmc_card *card)
594 struct mmc_csd *csd = &card->csd;
595 unsigned int e, m, csd_struct;
596 u32 *resp = card->raw_csd;
598 if (mmc_card_sd(card)) {
599 csd_struct = UNSTUFF_BITS(resp, 126, 2);
601 switch (csd_struct) {
603 m = UNSTUFF_BITS(resp, 115, 4);
604 e = UNSTUFF_BITS(resp, 112, 3);
605 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
606 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
608 m = UNSTUFF_BITS(resp, 99, 4);
609 e = UNSTUFF_BITS(resp, 96, 3);
610 csd->max_dtr = tran_exp[e] * tran_mant[m];
611 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
613 e = UNSTUFF_BITS(resp, 47, 3);
614 m = UNSTUFF_BITS(resp, 62, 12);
615 csd->capacity = (1 + m) << (e + 2);
617 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
618 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
619 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
620 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
621 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
622 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
623 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
627 * This is a block-addressed SDHC card. Most
628 * interesting fields are unused and have fixed
629 * values. To avoid getting tripped by buggy cards,
630 * we assume those fixed values ourselves.
632 mmc_card_set_blockaddr(card);
634 csd->tacc_ns = 0; /* Unused */
635 csd->tacc_clks = 0; /* Unused */
637 m = UNSTUFF_BITS(resp, 99, 4);
638 e = UNSTUFF_BITS(resp, 96, 3);
639 csd->max_dtr = tran_exp[e] * tran_mant[m];
640 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
642 m = UNSTUFF_BITS(resp, 48, 22);
643 csd->capacity = (1 + m) << 10;
645 csd->read_blkbits = 9;
646 csd->read_partial = 0;
647 csd->write_misalign = 0;
648 csd->read_misalign = 0;
649 csd->r2w_factor = 4; /* Unused */
650 csd->write_blkbits = 9;
651 csd->write_partial = 0;
654 printk("%s: unrecognised CSD structure version %d\n",
655 mmc_hostname(card->host), csd_struct);
656 mmc_card_set_bad(card);
661 * We only understand CSD structure v1.1 and v1.2.
662 * v1.2 has extra information in bits 15, 11 and 10.
664 csd_struct = UNSTUFF_BITS(resp, 126, 2);
665 if (csd_struct != 1 && csd_struct != 2) {
666 printk("%s: unrecognised CSD structure version %d\n",
667 mmc_hostname(card->host), csd_struct);
668 mmc_card_set_bad(card);
672 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
673 m = UNSTUFF_BITS(resp, 115, 4);
674 e = UNSTUFF_BITS(resp, 112, 3);
675 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
676 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
678 m = UNSTUFF_BITS(resp, 99, 4);
679 e = UNSTUFF_BITS(resp, 96, 3);
680 csd->max_dtr = tran_exp[e] * tran_mant[m];
681 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
683 e = UNSTUFF_BITS(resp, 47, 3);
684 m = UNSTUFF_BITS(resp, 62, 12);
685 csd->capacity = (1 + m) << (e + 2);
687 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
688 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
689 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
690 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
691 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
692 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
693 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
698 * Given a 64-bit response, decode to our card SCR structure.
700 static void mmc_decode_scr(struct mmc_card *card)
702 struct sd_scr *scr = &card->scr;
703 unsigned int scr_struct;
706 BUG_ON(!mmc_card_sd(card));
708 resp[3] = card->raw_scr[1];
709 resp[2] = card->raw_scr[0];
711 scr_struct = UNSTUFF_BITS(resp, 60, 4);
712 if (scr_struct != 0) {
713 printk("%s: unrecognised SCR structure version %d\n",
714 mmc_hostname(card->host), scr_struct);
715 mmc_card_set_bad(card);
719 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
720 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
724 * Locate a MMC card on this MMC host given a raw CID.
726 static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid)
728 struct mmc_card *card;
730 list_for_each_entry(card, &host->cards, node) {
731 if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0)
738 * Allocate a new MMC card, and assign a unique RCA.
740 static struct mmc_card *
741 mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca)
743 struct mmc_card *card, *c;
744 unsigned int rca = *frca;
746 card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL);
748 return ERR_PTR(-ENOMEM);
750 mmc_init_card(card, host);
751 memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid));
754 list_for_each_entry(c, &host->cards, node)
768 * Tell attached cards to go to IDLE state
770 static void mmc_idle_cards(struct mmc_host *host)
772 struct mmc_command cmd;
774 host->ios.chip_select = MMC_CS_HIGH;
779 cmd.opcode = MMC_GO_IDLE_STATE;
781 cmd.flags = MMC_RSP_NONE | MMC_CMD_BC;
783 mmc_wait_for_cmd(host, &cmd, 0);
787 host->ios.chip_select = MMC_CS_DONTCARE;
794 * Apply power to the MMC stack. This is a two-stage process.
795 * First, we enable power to the card without the clock running.
796 * We then wait a bit for the power to stabilise. Finally,
797 * enable the bus drivers and clock to the card.
799 * We must _NOT_ enable the clock prior to power stablising.
801 * If a host does all the power sequencing itself, ignore the
802 * initial MMC_POWER_UP stage.
804 static void mmc_power_up(struct mmc_host *host)
806 int bit = fls(host->ocr_avail) - 1;
809 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
810 host->ios.chip_select = MMC_CS_DONTCARE;
811 host->ios.power_mode = MMC_POWER_UP;
812 host->ios.bus_width = MMC_BUS_WIDTH_1;
813 host->ios.timing = MMC_TIMING_LEGACY;
818 host->ios.clock = host->f_min;
819 host->ios.power_mode = MMC_POWER_ON;
825 static void mmc_power_off(struct mmc_host *host)
829 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
830 host->ios.chip_select = MMC_CS_DONTCARE;
831 host->ios.power_mode = MMC_POWER_OFF;
832 host->ios.bus_width = MMC_BUS_WIDTH_1;
833 host->ios.timing = MMC_TIMING_LEGACY;
837 static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
839 struct mmc_command cmd;
842 cmd.opcode = MMC_SEND_OP_COND;
844 cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
846 for (i = 100; i; i--) {
847 err = mmc_wait_for_cmd(host, &cmd, 0);
848 if (err != MMC_ERR_NONE)
851 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
854 err = MMC_ERR_TIMEOUT;
865 static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
867 struct mmc_command cmd;
870 cmd.opcode = SD_APP_OP_COND;
872 cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
874 for (i = 100; i; i--) {
875 err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES);
876 if (err != MMC_ERR_NONE)
879 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
882 err = MMC_ERR_TIMEOUT;
893 static int mmc_send_if_cond(struct mmc_host *host, u32 ocr, int *rsd2)
895 struct mmc_command cmd;
897 static const u8 test_pattern = 0xAA;
900 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
901 * before SD_APP_OP_COND. This command will harmlessly fail for
904 cmd.opcode = SD_SEND_IF_COND;
905 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
906 cmd.flags = MMC_RSP_R7 | MMC_CMD_BCR;
908 err = mmc_wait_for_cmd(host, &cmd, 0);
909 if (err == MMC_ERR_NONE) {
910 if ((cmd.resp[0] & 0xFF) == test_pattern) {
914 err = MMC_ERR_FAILED;
918 * Treat errors as SD 1.0 card.
929 * Discover cards by requesting their CID. If this command
930 * times out, it is not an error; there are no further cards
931 * to be discovered. Add new cards to the list.
933 * Create a mmc_card entry for each discovered card, assigning
934 * it an RCA, and save the raw CID for decoding later.
936 static void mmc_discover_cards(struct mmc_host *host)
938 struct mmc_card *card;
939 unsigned int first_rca = 1, err;
942 struct mmc_command cmd;
944 cmd.opcode = MMC_ALL_SEND_CID;
946 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
948 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
949 if (err == MMC_ERR_TIMEOUT) {
953 if (err != MMC_ERR_NONE) {
954 printk(KERN_ERR "%s: error requesting CID: %d\n",
955 mmc_hostname(host), err);
959 card = mmc_find_card(host, cmd.resp);
961 card = mmc_alloc_card(host, cmd.resp, &first_rca);
966 list_add(&card->node, &host->cards);
969 card->state &= ~MMC_STATE_DEAD;
971 if (host->mode == MMC_MODE_SD) {
972 mmc_card_set_sd(card);
974 cmd.opcode = SD_SEND_RELATIVE_ADDR;
976 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
978 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
979 if (err != MMC_ERR_NONE)
980 mmc_card_set_dead(card);
982 card->rca = cmd.resp[0] >> 16;
984 if (!host->ops->get_ro) {
985 printk(KERN_WARNING "%s: host does not "
986 "support reading read-only "
987 "switch. assuming write-enable.\n",
990 if (host->ops->get_ro(host))
991 mmc_card_set_readonly(card);
995 cmd.opcode = MMC_SET_RELATIVE_ADDR;
996 cmd.arg = card->rca << 16;
997 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
999 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1000 if (err != MMC_ERR_NONE)
1001 mmc_card_set_dead(card);
1006 static void mmc_read_csds(struct mmc_host *host)
1008 struct mmc_card *card;
1010 list_for_each_entry(card, &host->cards, node) {
1011 struct mmc_command cmd;
1014 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
1017 cmd.opcode = MMC_SEND_CSD;
1018 cmd.arg = card->rca << 16;
1019 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
1021 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1022 if (err != MMC_ERR_NONE) {
1023 mmc_card_set_dead(card);
1027 memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd));
1029 mmc_decode_csd(card);
1030 mmc_decode_cid(card);
1034 static void mmc_process_ext_csds(struct mmc_host *host)
1037 struct mmc_card *card;
1039 struct mmc_request mrq;
1040 struct mmc_command cmd;
1041 struct mmc_data data;
1043 struct scatterlist sg;
1046 * As the ext_csd is so large and mostly unused, we don't store the
1047 * raw block in mmc_card.
1050 ext_csd = kmalloc(512, GFP_KERNEL);
1052 printk("%s: could not allocate a buffer to receive the ext_csd."
1053 "mmc v4 cards will be treated as v3.\n",
1054 mmc_hostname(host));
1058 list_for_each_entry(card, &host->cards, node) {
1059 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
1061 if (mmc_card_sd(card))
1063 if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
1066 err = mmc_select_card(host, card);
1067 if (err != MMC_ERR_NONE) {
1068 mmc_card_set_dead(card);
1072 memset(&cmd, 0, sizeof(struct mmc_command));
1074 cmd.opcode = MMC_SEND_EXT_CSD;
1076 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1078 memset(&data, 0, sizeof(struct mmc_data));
1080 mmc_set_data_timeout(&data, card, 0);
1084 data.flags = MMC_DATA_READ;
1088 memset(&mrq, 0, sizeof(struct mmc_request));
1093 sg_init_one(&sg, ext_csd, 512);
1095 mmc_wait_for_req(host, &mrq);
1097 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
1098 printk("%s: unable to read EXT_CSD, performance "
1099 "might suffer.\n", mmc_hostname(card->host));
1103 switch (ext_csd[EXT_CSD_CARD_TYPE]) {
1104 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
1105 card->ext_csd.hs_max_dtr = 52000000;
1107 case EXT_CSD_CARD_TYPE_26:
1108 card->ext_csd.hs_max_dtr = 26000000;
1111 /* MMC v4 spec says this cannot happen */
1112 printk("%s: card is mmc v4 but doesn't support "
1113 "any high-speed modes.\n",
1114 mmc_hostname(card->host));
1118 if (host->caps & MMC_CAP_MMC_HIGHSPEED) {
1119 /* Activate highspeed support. */
1120 cmd.opcode = MMC_SWITCH;
1121 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
1122 (EXT_CSD_HS_TIMING << 16) |
1124 EXT_CSD_CMD_SET_NORMAL;
1125 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1127 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1128 if (err != MMC_ERR_NONE) {
1129 printk("%s: failed to switch card to mmc v4 "
1130 "high-speed mode.\n",
1131 mmc_hostname(card->host));
1135 mmc_card_set_highspeed(card);
1137 host->ios.timing = MMC_TIMING_SD_HS;
1141 /* Check for host support for wide-bus modes. */
1142 if (host->caps & MMC_CAP_4_BIT_DATA) {
1143 /* Activate 4-bit support. */
1144 cmd.opcode = MMC_SWITCH;
1145 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
1146 (EXT_CSD_BUS_WIDTH << 16) |
1147 (EXT_CSD_BUS_WIDTH_4 << 8) |
1148 EXT_CSD_CMD_SET_NORMAL;
1149 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1151 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1152 if (err != MMC_ERR_NONE) {
1153 printk("%s: failed to switch card to "
1154 "mmc v4 4-bit bus mode.\n",
1155 mmc_hostname(card->host));
1159 host->ios.bus_width = MMC_BUS_WIDTH_4;
1166 mmc_deselect_cards(host);
1169 static void mmc_read_scrs(struct mmc_host *host)
1172 struct mmc_card *card;
1173 struct mmc_request mrq;
1174 struct mmc_command cmd;
1175 struct mmc_data data;
1176 struct scatterlist sg;
1178 list_for_each_entry(card, &host->cards, node) {
1179 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
1181 if (!mmc_card_sd(card))
1184 err = mmc_select_card(host, card);
1185 if (err != MMC_ERR_NONE) {
1186 mmc_card_set_dead(card);
1190 memset(&cmd, 0, sizeof(struct mmc_command));
1192 cmd.opcode = MMC_APP_CMD;
1193 cmd.arg = card->rca << 16;
1194 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1196 err = mmc_wait_for_cmd(host, &cmd, 0);
1197 if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) {
1198 mmc_card_set_dead(card);
1202 memset(&cmd, 0, sizeof(struct mmc_command));
1204 cmd.opcode = SD_APP_SEND_SCR;
1206 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1208 memset(&data, 0, sizeof(struct mmc_data));
1210 mmc_set_data_timeout(&data, card, 0);
1212 data.blksz = 1 << 3;
1214 data.flags = MMC_DATA_READ;
1218 memset(&mrq, 0, sizeof(struct mmc_request));
1223 sg_init_one(&sg, (u8*)card->raw_scr, 8);
1225 mmc_wait_for_req(host, &mrq);
1227 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
1228 mmc_card_set_dead(card);
1232 card->raw_scr[0] = ntohl(card->raw_scr[0]);
1233 card->raw_scr[1] = ntohl(card->raw_scr[1]);
1235 mmc_decode_scr(card);
1238 mmc_deselect_cards(host);
1241 static void mmc_read_switch_caps(struct mmc_host *host)
1244 struct mmc_card *card;
1245 struct mmc_request mrq;
1246 struct mmc_command cmd;
1247 struct mmc_data data;
1248 unsigned char *status;
1249 struct scatterlist sg;
1251 if (!(host->caps & MMC_CAP_SD_HIGHSPEED))
1254 status = kmalloc(64, GFP_KERNEL);
1256 printk(KERN_WARNING "%s: Unable to allocate buffer for "
1257 "reading switch capabilities.\n",
1258 mmc_hostname(host));
1262 list_for_each_entry(card, &host->cards, node) {
1263 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
1265 if (!mmc_card_sd(card))
1267 if (card->scr.sda_vsn < SCR_SPEC_VER_1)
1270 err = mmc_select_card(host, card);
1271 if (err != MMC_ERR_NONE) {
1272 mmc_card_set_dead(card);
1276 memset(&cmd, 0, sizeof(struct mmc_command));
1278 cmd.opcode = SD_SWITCH;
1279 cmd.arg = 0x00FFFFF1;
1280 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1282 memset(&data, 0, sizeof(struct mmc_data));
1284 mmc_set_data_timeout(&data, card, 0);
1288 data.flags = MMC_DATA_READ;
1292 memset(&mrq, 0, sizeof(struct mmc_request));
1297 sg_init_one(&sg, status, 64);
1299 mmc_wait_for_req(host, &mrq);
1301 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
1302 printk("%s: unable to read switch capabilities, "
1303 "performance might suffer.\n",
1304 mmc_hostname(card->host));
1308 if (status[13] & 0x02)
1309 card->sw_caps.hs_max_dtr = 50000000;
1311 memset(&cmd, 0, sizeof(struct mmc_command));
1313 cmd.opcode = SD_SWITCH;
1314 cmd.arg = 0x80FFFFF1;
1315 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1317 memset(&data, 0, sizeof(struct mmc_data));
1319 mmc_set_data_timeout(&data, card, 0);
1323 data.flags = MMC_DATA_READ;
1327 memset(&mrq, 0, sizeof(struct mmc_request));
1332 sg_init_one(&sg, status, 64);
1334 mmc_wait_for_req(host, &mrq);
1336 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE ||
1337 (status[16] & 0xF) != 1) {
1338 printk(KERN_WARNING "%s: Problem switching card "
1339 "into high-speed mode!\n",
1340 mmc_hostname(host));
1344 mmc_card_set_highspeed(card);
1346 host->ios.timing = MMC_TIMING_SD_HS;
1352 mmc_deselect_cards(host);
1355 static unsigned int mmc_calculate_clock(struct mmc_host *host)
1357 struct mmc_card *card;
1358 unsigned int max_dtr = host->f_max;
1360 list_for_each_entry(card, &host->cards, node)
1361 if (!mmc_card_dead(card)) {
1362 if (mmc_card_highspeed(card) && mmc_card_sd(card)) {
1363 if (max_dtr > card->sw_caps.hs_max_dtr)
1364 max_dtr = card->sw_caps.hs_max_dtr;
1365 } else if (mmc_card_highspeed(card) && !mmc_card_sd(card)) {
1366 if (max_dtr > card->ext_csd.hs_max_dtr)
1367 max_dtr = card->ext_csd.hs_max_dtr;
1368 } else if (max_dtr > card->csd.max_dtr) {
1369 max_dtr = card->csd.max_dtr;
1373 pr_debug("%s: selected %d.%03dMHz transfer rate\n",
1375 max_dtr / 1000000, (max_dtr / 1000) % 1000);
1381 * Check whether cards we already know about are still present.
1382 * We do this by requesting status, and checking whether a card
1385 * A request for status does not cause a state change in data
1388 static void mmc_check_cards(struct mmc_host *host)
1390 struct list_head *l, *n;
1392 mmc_deselect_cards(host);
1394 list_for_each_safe(l, n, &host->cards) {
1395 struct mmc_card *card = mmc_list_to_card(l);
1396 struct mmc_command cmd;
1399 cmd.opcode = MMC_SEND_STATUS;
1400 cmd.arg = card->rca << 16;
1401 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1403 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1404 if (err == MMC_ERR_NONE)
1407 mmc_card_set_dead(card);
1411 static void mmc_setup(struct mmc_host *host)
1413 if (host->ios.power_mode != MMC_POWER_ON) {
1417 host->mode = MMC_MODE_SD;
1420 mmc_idle_cards(host);
1422 err = mmc_send_if_cond(host, host->ocr_avail, NULL);
1423 if (err != MMC_ERR_NONE) {
1426 err = mmc_send_app_op_cond(host, 0, &ocr);
1429 * If we fail to detect any SD cards then try
1430 * searching for MMC cards.
1432 if (err != MMC_ERR_NONE) {
1433 host->mode = MMC_MODE_MMC;
1435 err = mmc_send_op_cond(host, 0, &ocr);
1436 if (err != MMC_ERR_NONE)
1440 host->ocr = mmc_select_voltage(host, ocr);
1443 * Since we're changing the OCR value, we seem to
1444 * need to tell some cards to go back to the idle
1445 * state. We wait 1ms to give cards time to
1449 mmc_idle_cards(host);
1451 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1452 host->ios.clock = host->f_min;
1456 * We should remember the OCR mask from the existing
1457 * cards, and detect the new cards OCR mask, combine
1458 * the two and re-select the VDD. However, if we do
1459 * change VDD, we should do an idle, and then do a
1460 * full re-initialisation. We would need to notify
1461 * drivers so that they can re-setup the cards as
1462 * well, while keeping their queues at bay.
1464 * For the moment, we take the easy way out - if the
1465 * new cards don't like our currently selected VDD,
1466 * they drop off the bus.
1474 * Send the selected OCR multiple times... until the cards
1475 * all get the idea that they should be ready for CMD2.
1476 * (My SanDisk card seems to need this.)
1478 if (host->mode == MMC_MODE_SD) {
1480 err = mmc_send_if_cond(host, host->ocr, &sd2);
1481 if (err == MMC_ERR_NONE) {
1483 * If SD_SEND_IF_COND indicates an SD 2.0
1484 * compliant card and we should set bit 30
1485 * of the ocr to indicate that we can handle
1486 * block-addressed SDHC cards.
1488 mmc_send_app_op_cond(host, host->ocr | (sd2 << 30), NULL);
1491 mmc_send_op_cond(host, host->ocr, NULL);
1494 mmc_discover_cards(host);
1497 * Ok, now switch to push-pull mode.
1499 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1502 mmc_read_csds(host);
1504 if (host->mode == MMC_MODE_SD) {
1505 mmc_read_scrs(host);
1506 mmc_read_switch_caps(host);
1508 mmc_process_ext_csds(host);
1513 * mmc_detect_change - process change of state on a MMC socket
1514 * @host: host which changed state.
1515 * @delay: optional delay to wait before detection (jiffies)
1517 * All we know is that card(s) have been inserted or removed
1518 * from the socket(s). We don't know which socket or cards.
1520 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1522 mmc_schedule_delayed_work(&host->detect, delay);
1525 EXPORT_SYMBOL(mmc_detect_change);
1528 static void mmc_rescan(struct work_struct *work)
1530 struct mmc_host *host =
1531 container_of(work, struct mmc_host, detect.work);
1532 struct list_head *l, *n;
1533 unsigned char power_mode;
1535 mmc_claim_host(host);
1538 * Check for removed cards and newly inserted ones. We check for
1539 * removed cards first so we can intelligently re-select the VDD.
1541 power_mode = host->ios.power_mode;
1542 if (power_mode == MMC_POWER_ON)
1543 mmc_check_cards(host);
1548 * Some broken cards process CMD1 even in stand-by state. There is
1549 * no reply, but an ILLEGAL_COMMAND error is cached and returned
1550 * after next command. We poll for card status here to clear any
1551 * possibly pending error.
1553 if (power_mode == MMC_POWER_ON)
1554 mmc_check_cards(host);
1556 if (!list_empty(&host->cards)) {
1558 * (Re-)calculate the fastest clock rate which the
1559 * attached cards and the host support.
1561 host->ios.clock = mmc_calculate_clock(host);
1565 mmc_release_host(host);
1567 list_for_each_safe(l, n, &host->cards) {
1568 struct mmc_card *card = mmc_list_to_card(l);
1571 * If this is a new and good card, register it.
1573 if (!mmc_card_present(card) && !mmc_card_dead(card)) {
1574 if (mmc_register_card(card))
1575 mmc_card_set_dead(card);
1577 mmc_card_set_present(card);
1581 * If this card is dead, destroy it.
1583 if (mmc_card_dead(card)) {
1584 list_del(&card->node);
1585 mmc_remove_card(card);
1590 * If we discover that there are no cards on the
1591 * bus, turn off the clock and power down.
1593 if (list_empty(&host->cards))
1594 mmc_power_off(host);
1599 * mmc_alloc_host - initialise the per-host structure.
1600 * @extra: sizeof private data structure
1601 * @dev: pointer to host device model structure
1603 * Initialise the per-host structure.
1605 struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
1607 struct mmc_host *host;
1609 host = mmc_alloc_host_sysfs(extra, dev);
1611 spin_lock_init(&host->lock);
1612 init_waitqueue_head(&host->wq);
1613 INIT_LIST_HEAD(&host->cards);
1614 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
1617 * By default, hosts do not support SGIO or large requests.
1618 * They have to set these according to their abilities.
1620 host->max_hw_segs = 1;
1621 host->max_phys_segs = 1;
1622 host->max_seg_size = PAGE_CACHE_SIZE;
1624 host->max_req_size = PAGE_CACHE_SIZE;
1625 host->max_blk_size = 512;
1626 host->max_blk_count = PAGE_CACHE_SIZE / 512;
1632 EXPORT_SYMBOL(mmc_alloc_host);
1635 * mmc_add_host - initialise host hardware
1638 int mmc_add_host(struct mmc_host *host)
1642 ret = mmc_add_host_sysfs(host);
1644 mmc_power_off(host);
1645 mmc_detect_change(host, 0);
1651 EXPORT_SYMBOL(mmc_add_host);
1654 * mmc_remove_host - remove host hardware
1657 * Unregister and remove all cards associated with this host,
1658 * and power down the MMC bus.
1660 void mmc_remove_host(struct mmc_host *host)
1662 struct list_head *l, *n;
1664 list_for_each_safe(l, n, &host->cards) {
1665 struct mmc_card *card = mmc_list_to_card(l);
1667 mmc_remove_card(card);
1670 mmc_power_off(host);
1671 mmc_remove_host_sysfs(host);
1674 EXPORT_SYMBOL(mmc_remove_host);
1677 * mmc_free_host - free the host structure
1680 * Free the host once all references to it have been dropped.
1682 void mmc_free_host(struct mmc_host *host)
1684 mmc_flush_scheduled_work();
1685 mmc_free_host_sysfs(host);
1688 EXPORT_SYMBOL(mmc_free_host);
1693 * mmc_suspend_host - suspend a host
1695 * @state: suspend mode (PM_SUSPEND_xxx)
1697 int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
1699 mmc_claim_host(host);
1700 mmc_deselect_cards(host);
1701 mmc_power_off(host);
1702 mmc_release_host(host);
1707 EXPORT_SYMBOL(mmc_suspend_host);
1710 * mmc_resume_host - resume a previously suspended host
1713 int mmc_resume_host(struct mmc_host *host)
1715 mmc_rescan(&host->detect.work);
1720 EXPORT_SYMBOL(mmc_resume_host);
1724 MODULE_LICENSE("GPL");