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.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
12 #include <linux/config.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/completion.h>
17 #include <linux/device.h>
18 #include <linux/delay.h>
19 #include <linux/pagemap.h>
20 #include <linux/err.h>
21 #include <asm/scatterlist.h>
22 #include <linux/scatterlist.h>
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->card_busy == NULL);
111 mrq->cmd->data = mrq->data;
112 mrq->data->error = 0;
113 mrq->data->mrq = mrq;
115 mrq->data->stop = mrq->stop;
116 mrq->stop->error = 0;
117 mrq->stop->mrq = mrq;
120 host->ops->request(host, mrq);
123 EXPORT_SYMBOL(mmc_start_request);
125 static void mmc_wait_done(struct mmc_request *mrq)
127 complete(mrq->done_data);
130 int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
132 DECLARE_COMPLETION(complete);
134 mrq->done_data = &complete;
135 mrq->done = mmc_wait_done;
137 mmc_start_request(host, mrq);
139 wait_for_completion(&complete);
144 EXPORT_SYMBOL(mmc_wait_for_req);
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
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.
156 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
158 struct mmc_request mrq;
160 BUG_ON(host->card_busy == NULL);
162 memset(&mrq, 0, sizeof(struct mmc_request));
164 memset(cmd->resp, 0, sizeof(cmd->resp));
165 cmd->retries = retries;
170 mmc_wait_for_req(host, &mrq);
175 EXPORT_SYMBOL(mmc_wait_for_cmd);
178 * mmc_wait_for_app_cmd - start an application command and wait for
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
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.
190 int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca,
191 struct mmc_command *cmd, int retries)
193 struct mmc_request mrq;
194 struct mmc_command appcmd;
198 BUG_ON(host->card_busy == NULL);
201 err = MMC_ERR_INVALID;
204 * We have to resend MMC_APP_CMD for each attempt so
205 * we cannot use the retries field in mmc_command.
207 for (i = 0;i <= retries;i++) {
208 memset(&mrq, 0, sizeof(struct mmc_request));
210 appcmd.opcode = MMC_APP_CMD;
211 appcmd.arg = rca << 16;
212 appcmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
214 memset(appcmd.resp, 0, sizeof(appcmd.resp));
220 mmc_wait_for_req(host, &mrq);
227 /* Check that card supported application commands */
228 if (!(appcmd.resp[0] & R1_APP_CMD))
229 return MMC_ERR_FAILED;
231 memset(&mrq, 0, sizeof(struct mmc_request));
233 memset(cmd->resp, 0, sizeof(cmd->resp));
239 mmc_wait_for_req(host, &mrq);
242 if (cmd->error == MMC_ERR_NONE)
249 EXPORT_SYMBOL(mmc_wait_for_app_cmd);
251 static int mmc_select_card(struct mmc_host *host, struct mmc_card *card);
254 * __mmc_claim_host - exclusively claim a host
255 * @host: mmc host to claim
256 * @card: mmc card to claim host for
258 * Claim a host for a set of operations. If a valid card
259 * is passed and this wasn't the last card selected, select
260 * the card before returning.
262 * Note: you should use mmc_card_claim_host or mmc_claim_host.
264 int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card)
266 DECLARE_WAITQUEUE(wait, current);
270 add_wait_queue(&host->wq, &wait);
271 spin_lock_irqsave(&host->lock, flags);
273 set_current_state(TASK_UNINTERRUPTIBLE);
274 if (host->card_busy == NULL)
276 spin_unlock_irqrestore(&host->lock, flags);
278 spin_lock_irqsave(&host->lock, flags);
280 set_current_state(TASK_RUNNING);
281 host->card_busy = card;
282 spin_unlock_irqrestore(&host->lock, flags);
283 remove_wait_queue(&host->wq, &wait);
285 if (card != (void *)-1) {
286 err = mmc_select_card(host, card);
287 if (err != MMC_ERR_NONE)
294 EXPORT_SYMBOL(__mmc_claim_host);
297 * mmc_release_host - release a host
298 * @host: mmc host to release
300 * Release a MMC host, allowing others to claim the host
301 * for their operations.
303 void mmc_release_host(struct mmc_host *host)
307 BUG_ON(host->card_busy == NULL);
309 spin_lock_irqsave(&host->lock, flags);
310 host->card_busy = NULL;
311 spin_unlock_irqrestore(&host->lock, flags);
316 EXPORT_SYMBOL(mmc_release_host);
318 static inline void mmc_set_ios(struct mmc_host *host)
320 struct mmc_ios *ios = &host->ios;
322 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u width %u\n",
323 mmc_hostname(host), ios->clock, ios->bus_mode,
324 ios->power_mode, ios->chip_select, ios->vdd,
327 host->ops->set_ios(host, ios);
330 static int mmc_select_card(struct mmc_host *host, struct mmc_card *card)
333 struct mmc_command cmd;
335 BUG_ON(host->card_busy == NULL);
337 if (host->card_selected == card)
340 host->card_selected = card;
342 cmd.opcode = MMC_SELECT_CARD;
343 cmd.arg = card->rca << 16;
344 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
346 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
347 if (err != MMC_ERR_NONE)
351 * Default bus width is 1 bit.
353 host->ios.bus_width = MMC_BUS_WIDTH_1;
356 * We can only change the bus width of the selected
357 * card so therefore we have to put the handling
360 if (host->caps & MMC_CAP_4_BIT_DATA) {
362 * The card is in 1 bit mode by default so
363 * we only need to change if it supports the
366 if (mmc_card_sd(card) &&
367 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
368 struct mmc_command cmd;
369 cmd.opcode = SD_APP_SET_BUS_WIDTH;
370 cmd.arg = SD_BUS_WIDTH_4;
371 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
373 err = mmc_wait_for_app_cmd(host, card->rca, &cmd,
375 if (err != MMC_ERR_NONE)
378 host->ios.bus_width = MMC_BUS_WIDTH_4;
388 * Ensure that no card is selected.
390 static void mmc_deselect_cards(struct mmc_host *host)
392 struct mmc_command cmd;
394 if (host->card_selected) {
395 host->card_selected = NULL;
397 cmd.opcode = MMC_SELECT_CARD;
399 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
401 mmc_wait_for_cmd(host, &cmd, 0);
406 static inline void mmc_delay(unsigned int ms)
408 if (ms < HZ / 1000) {
412 msleep_interruptible (ms);
417 * Mask off any voltages we don't support and select
420 static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
424 ocr &= host->ocr_avail;
441 #define UNSTUFF_BITS(resp,start,size) \
443 const int __size = size; \
444 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
445 const int __off = 3 - ((start) / 32); \
446 const int __shft = (start) & 31; \
449 __res = resp[__off] >> __shft; \
450 if (__size + __shft > 32) \
451 __res |= resp[__off-1] << ((32 - __shft) % 32); \
456 * Given the decoded CSD structure, decode the raw CID to our CID structure.
458 static void mmc_decode_cid(struct mmc_card *card)
460 u32 *resp = card->raw_cid;
462 memset(&card->cid, 0, sizeof(struct mmc_cid));
464 if (mmc_card_sd(card)) {
466 * SD doesn't currently have a version field so we will
467 * have to assume we can parse this.
469 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
470 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
471 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
472 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
473 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
474 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
475 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
476 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
477 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
478 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
479 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
480 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
482 card->cid.year += 2000; /* SD cards year offset */
485 * The selection of the format here is based upon published
486 * specs from sandisk and from what people have reported.
488 switch (card->csd.mmca_vsn) {
489 case 0: /* MMC v1.0 - v1.2 */
490 case 1: /* MMC v1.4 */
491 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
492 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
493 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
494 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
495 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
496 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
497 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
498 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
499 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
500 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
501 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
502 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
503 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
506 case 2: /* MMC v2.0 - v2.2 */
507 case 3: /* MMC v3.1 - v3.3 */
509 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
510 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
511 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
512 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
513 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
514 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
515 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
516 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
517 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
518 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
519 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
523 printk("%s: card has unknown MMCA version %d\n",
524 mmc_hostname(card->host), card->csd.mmca_vsn);
525 mmc_card_set_bad(card);
532 * Given a 128-bit response, decode to our card CSD structure.
534 static void mmc_decode_csd(struct mmc_card *card)
536 struct mmc_csd *csd = &card->csd;
537 unsigned int e, m, csd_struct;
538 u32 *resp = card->raw_csd;
540 if (mmc_card_sd(card)) {
541 csd_struct = UNSTUFF_BITS(resp, 126, 2);
542 if (csd_struct != 0) {
543 printk("%s: unrecognised CSD structure version %d\n",
544 mmc_hostname(card->host), csd_struct);
545 mmc_card_set_bad(card);
549 m = UNSTUFF_BITS(resp, 115, 4);
550 e = UNSTUFF_BITS(resp, 112, 3);
551 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
552 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
554 m = UNSTUFF_BITS(resp, 99, 4);
555 e = UNSTUFF_BITS(resp, 96, 3);
556 csd->max_dtr = tran_exp[e] * tran_mant[m];
557 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
559 e = UNSTUFF_BITS(resp, 47, 3);
560 m = UNSTUFF_BITS(resp, 62, 12);
561 csd->capacity = (1 + m) << (e + 2);
563 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
564 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
565 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
566 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
567 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
568 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
569 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
572 * We only understand CSD structure v1.1 and v1.2.
573 * v1.2 has extra information in bits 15, 11 and 10.
575 csd_struct = UNSTUFF_BITS(resp, 126, 2);
576 if (csd_struct != 1 && csd_struct != 2) {
577 printk("%s: unrecognised CSD structure version %d\n",
578 mmc_hostname(card->host), csd_struct);
579 mmc_card_set_bad(card);
583 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
584 m = UNSTUFF_BITS(resp, 115, 4);
585 e = UNSTUFF_BITS(resp, 112, 3);
586 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
587 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
589 m = UNSTUFF_BITS(resp, 99, 4);
590 e = UNSTUFF_BITS(resp, 96, 3);
591 csd->max_dtr = tran_exp[e] * tran_mant[m];
592 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
594 e = UNSTUFF_BITS(resp, 47, 3);
595 m = UNSTUFF_BITS(resp, 62, 12);
596 csd->capacity = (1 + m) << (e + 2);
598 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
599 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
600 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
601 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
602 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
603 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
604 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
609 * Given a 64-bit response, decode to our card SCR structure.
611 static void mmc_decode_scr(struct mmc_card *card)
613 struct sd_scr *scr = &card->scr;
614 unsigned int scr_struct;
617 BUG_ON(!mmc_card_sd(card));
619 resp[3] = card->raw_scr[1];
620 resp[2] = card->raw_scr[0];
622 scr_struct = UNSTUFF_BITS(resp, 60, 4);
623 if (scr_struct != 0) {
624 printk("%s: unrecognised SCR structure version %d\n",
625 mmc_hostname(card->host), scr_struct);
626 mmc_card_set_bad(card);
630 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
631 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
635 * Locate a MMC card on this MMC host given a raw CID.
637 static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid)
639 struct mmc_card *card;
641 list_for_each_entry(card, &host->cards, node) {
642 if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0)
649 * Allocate a new MMC card, and assign a unique RCA.
651 static struct mmc_card *
652 mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca)
654 struct mmc_card *card, *c;
655 unsigned int rca = *frca;
657 card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL);
659 return ERR_PTR(-ENOMEM);
661 mmc_init_card(card, host);
662 memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid));
665 list_for_each_entry(c, &host->cards, node)
679 * Tell attached cards to go to IDLE state
681 static void mmc_idle_cards(struct mmc_host *host)
683 struct mmc_command cmd;
685 host->ios.chip_select = MMC_CS_HIGH;
690 cmd.opcode = MMC_GO_IDLE_STATE;
692 cmd.flags = MMC_RSP_NONE | MMC_CMD_BC;
694 mmc_wait_for_cmd(host, &cmd, 0);
698 host->ios.chip_select = MMC_CS_DONTCARE;
705 * Apply power to the MMC stack. This is a two-stage process.
706 * First, we enable power to the card without the clock running.
707 * We then wait a bit for the power to stabilise. Finally,
708 * enable the bus drivers and clock to the card.
710 * We must _NOT_ enable the clock prior to power stablising.
712 * If a host does all the power sequencing itself, ignore the
713 * initial MMC_POWER_UP stage.
715 static void mmc_power_up(struct mmc_host *host)
717 int bit = fls(host->ocr_avail) - 1;
720 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
721 host->ios.chip_select = MMC_CS_DONTCARE;
722 host->ios.power_mode = MMC_POWER_UP;
723 host->ios.bus_width = MMC_BUS_WIDTH_1;
728 host->ios.clock = host->f_min;
729 host->ios.power_mode = MMC_POWER_ON;
735 static void mmc_power_off(struct mmc_host *host)
739 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
740 host->ios.chip_select = MMC_CS_DONTCARE;
741 host->ios.power_mode = MMC_POWER_OFF;
742 host->ios.bus_width = MMC_BUS_WIDTH_1;
746 static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
748 struct mmc_command cmd;
751 cmd.opcode = MMC_SEND_OP_COND;
753 cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
755 for (i = 100; i; i--) {
756 err = mmc_wait_for_cmd(host, &cmd, 0);
757 if (err != MMC_ERR_NONE)
760 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
763 err = MMC_ERR_TIMEOUT;
774 static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
776 struct mmc_command cmd;
779 cmd.opcode = SD_APP_OP_COND;
781 cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
783 for (i = 100; i; i--) {
784 err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES);
785 if (err != MMC_ERR_NONE)
788 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
791 err = MMC_ERR_TIMEOUT;
803 * Discover cards by requesting their CID. If this command
804 * times out, it is not an error; there are no further cards
805 * to be discovered. Add new cards to the list.
807 * Create a mmc_card entry for each discovered card, assigning
808 * it an RCA, and save the raw CID for decoding later.
810 static void mmc_discover_cards(struct mmc_host *host)
812 struct mmc_card *card;
813 unsigned int first_rca = 1, err;
816 struct mmc_command cmd;
818 cmd.opcode = MMC_ALL_SEND_CID;
820 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
822 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
823 if (err == MMC_ERR_TIMEOUT) {
827 if (err != MMC_ERR_NONE) {
828 printk(KERN_ERR "%s: error requesting CID: %d\n",
829 mmc_hostname(host), err);
833 card = mmc_find_card(host, cmd.resp);
835 card = mmc_alloc_card(host, cmd.resp, &first_rca);
840 list_add(&card->node, &host->cards);
843 card->state &= ~MMC_STATE_DEAD;
845 if (host->mode == MMC_MODE_SD) {
846 mmc_card_set_sd(card);
848 cmd.opcode = SD_SEND_RELATIVE_ADDR;
850 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
852 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
853 if (err != MMC_ERR_NONE)
854 mmc_card_set_dead(card);
856 card->rca = cmd.resp[0] >> 16;
858 if (!host->ops->get_ro) {
859 printk(KERN_WARNING "%s: host does not "
860 "support reading read-only "
861 "switch. assuming write-enable.\n",
864 if (host->ops->get_ro(host))
865 mmc_card_set_readonly(card);
869 cmd.opcode = MMC_SET_RELATIVE_ADDR;
870 cmd.arg = card->rca << 16;
871 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
873 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
874 if (err != MMC_ERR_NONE)
875 mmc_card_set_dead(card);
880 static void mmc_read_csds(struct mmc_host *host)
882 struct mmc_card *card;
884 list_for_each_entry(card, &host->cards, node) {
885 struct mmc_command cmd;
888 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
891 cmd.opcode = MMC_SEND_CSD;
892 cmd.arg = card->rca << 16;
893 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
895 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
896 if (err != MMC_ERR_NONE) {
897 mmc_card_set_dead(card);
901 memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd));
903 mmc_decode_csd(card);
904 mmc_decode_cid(card);
908 static void mmc_read_scrs(struct mmc_host *host)
911 struct mmc_card *card;
913 struct mmc_request mrq;
914 struct mmc_command cmd;
915 struct mmc_data data;
917 struct scatterlist sg;
919 list_for_each_entry(card, &host->cards, node) {
920 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
922 if (!mmc_card_sd(card))
925 err = mmc_select_card(host, card);
926 if (err != MMC_ERR_NONE) {
927 mmc_card_set_dead(card);
931 memset(&cmd, 0, sizeof(struct mmc_command));
933 cmd.opcode = MMC_APP_CMD;
934 cmd.arg = card->rca << 16;
935 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
937 err = mmc_wait_for_cmd(host, &cmd, 0);
938 if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) {
939 mmc_card_set_dead(card);
943 memset(&cmd, 0, sizeof(struct mmc_command));
945 cmd.opcode = SD_APP_SEND_SCR;
947 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
949 memset(&data, 0, sizeof(struct mmc_data));
951 data.timeout_ns = card->csd.tacc_ns * 10;
952 data.timeout_clks = card->csd.tacc_clks * 10;
955 data.flags = MMC_DATA_READ;
959 memset(&mrq, 0, sizeof(struct mmc_request));
964 sg_init_one(&sg, (u8*)card->raw_scr, 8);
966 mmc_wait_for_req(host, &mrq);
968 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
969 mmc_card_set_dead(card);
973 card->raw_scr[0] = ntohl(card->raw_scr[0]);
974 card->raw_scr[1] = ntohl(card->raw_scr[1]);
976 mmc_decode_scr(card);
979 mmc_deselect_cards(host);
982 static unsigned int mmc_calculate_clock(struct mmc_host *host)
984 struct mmc_card *card;
985 unsigned int max_dtr = host->f_max;
987 list_for_each_entry(card, &host->cards, node)
988 if (!mmc_card_dead(card) && max_dtr > card->csd.max_dtr)
989 max_dtr = card->csd.max_dtr;
991 pr_debug("%s: selected %d.%03dMHz transfer rate\n",
993 max_dtr / 1000000, (max_dtr / 1000) % 1000);
999 * Check whether cards we already know about are still present.
1000 * We do this by requesting status, and checking whether a card
1003 * A request for status does not cause a state change in data
1006 static void mmc_check_cards(struct mmc_host *host)
1008 struct list_head *l, *n;
1010 mmc_deselect_cards(host);
1012 list_for_each_safe(l, n, &host->cards) {
1013 struct mmc_card *card = mmc_list_to_card(l);
1014 struct mmc_command cmd;
1017 cmd.opcode = MMC_SEND_STATUS;
1018 cmd.arg = card->rca << 16;
1019 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1021 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
1022 if (err == MMC_ERR_NONE)
1025 mmc_card_set_dead(card);
1029 static void mmc_setup(struct mmc_host *host)
1031 if (host->ios.power_mode != MMC_POWER_ON) {
1035 host->mode = MMC_MODE_SD;
1038 mmc_idle_cards(host);
1040 err = mmc_send_app_op_cond(host, 0, &ocr);
1043 * If we fail to detect any SD cards then try
1044 * searching for MMC cards.
1046 if (err != MMC_ERR_NONE) {
1047 host->mode = MMC_MODE_MMC;
1049 err = mmc_send_op_cond(host, 0, &ocr);
1050 if (err != MMC_ERR_NONE)
1054 host->ocr = mmc_select_voltage(host, ocr);
1057 * Since we're changing the OCR value, we seem to
1058 * need to tell some cards to go back to the idle
1059 * state. We wait 1ms to give cards time to
1063 mmc_idle_cards(host);
1065 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1066 host->ios.clock = host->f_min;
1070 * We should remember the OCR mask from the existing
1071 * cards, and detect the new cards OCR mask, combine
1072 * the two and re-select the VDD. However, if we do
1073 * change VDD, we should do an idle, and then do a
1074 * full re-initialisation. We would need to notify
1075 * drivers so that they can re-setup the cards as
1076 * well, while keeping their queues at bay.
1078 * For the moment, we take the easy way out - if the
1079 * new cards don't like our currently selected VDD,
1080 * they drop off the bus.
1088 * Send the selected OCR multiple times... until the cards
1089 * all get the idea that they should be ready for CMD2.
1090 * (My SanDisk card seems to need this.)
1092 if (host->mode == MMC_MODE_SD)
1093 mmc_send_app_op_cond(host, host->ocr, NULL);
1095 mmc_send_op_cond(host, host->ocr, NULL);
1097 mmc_discover_cards(host);
1100 * Ok, now switch to push-pull mode.
1102 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1105 mmc_read_csds(host);
1107 if (host->mode == MMC_MODE_SD)
1108 mmc_read_scrs(host);
1113 * mmc_detect_change - process change of state on a MMC socket
1114 * @host: host which changed state.
1115 * @delay: optional delay to wait before detection (jiffies)
1117 * All we know is that card(s) have been inserted or removed
1118 * from the socket(s). We don't know which socket or cards.
1120 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1123 schedule_delayed_work(&host->detect, delay);
1125 schedule_work(&host->detect);
1128 EXPORT_SYMBOL(mmc_detect_change);
1131 static void mmc_rescan(void *data)
1133 struct mmc_host *host = data;
1134 struct list_head *l, *n;
1136 mmc_claim_host(host);
1138 if (host->ios.power_mode == MMC_POWER_ON)
1139 mmc_check_cards(host);
1143 if (!list_empty(&host->cards)) {
1145 * (Re-)calculate the fastest clock rate which the
1146 * attached cards and the host support.
1148 host->ios.clock = mmc_calculate_clock(host);
1152 mmc_release_host(host);
1154 list_for_each_safe(l, n, &host->cards) {
1155 struct mmc_card *card = mmc_list_to_card(l);
1158 * If this is a new and good card, register it.
1160 if (!mmc_card_present(card) && !mmc_card_dead(card)) {
1161 if (mmc_register_card(card))
1162 mmc_card_set_dead(card);
1164 mmc_card_set_present(card);
1168 * If this card is dead, destroy it.
1170 if (mmc_card_dead(card)) {
1171 list_del(&card->node);
1172 mmc_remove_card(card);
1177 * If we discover that there are no cards on the
1178 * bus, turn off the clock and power down.
1180 if (list_empty(&host->cards))
1181 mmc_power_off(host);
1186 * mmc_alloc_host - initialise the per-host structure.
1187 * @extra: sizeof private data structure
1188 * @dev: pointer to host device model structure
1190 * Initialise the per-host structure.
1192 struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
1194 struct mmc_host *host;
1196 host = mmc_alloc_host_sysfs(extra, dev);
1198 spin_lock_init(&host->lock);
1199 init_waitqueue_head(&host->wq);
1200 INIT_LIST_HEAD(&host->cards);
1201 INIT_WORK(&host->detect, mmc_rescan, host);
1204 * By default, hosts do not support SGIO or large requests.
1205 * They have to set these according to their abilities.
1207 host->max_hw_segs = 1;
1208 host->max_phys_segs = 1;
1209 host->max_sectors = 1 << (PAGE_CACHE_SHIFT - 9);
1210 host->max_seg_size = PAGE_CACHE_SIZE;
1216 EXPORT_SYMBOL(mmc_alloc_host);
1219 * mmc_add_host - initialise host hardware
1222 int mmc_add_host(struct mmc_host *host)
1226 ret = mmc_add_host_sysfs(host);
1228 mmc_power_off(host);
1229 mmc_detect_change(host, 0);
1235 EXPORT_SYMBOL(mmc_add_host);
1238 * mmc_remove_host - remove host hardware
1241 * Unregister and remove all cards associated with this host,
1242 * and power down the MMC bus.
1244 void mmc_remove_host(struct mmc_host *host)
1246 struct list_head *l, *n;
1248 list_for_each_safe(l, n, &host->cards) {
1249 struct mmc_card *card = mmc_list_to_card(l);
1251 mmc_remove_card(card);
1254 mmc_power_off(host);
1255 mmc_remove_host_sysfs(host);
1258 EXPORT_SYMBOL(mmc_remove_host);
1261 * mmc_free_host - free the host structure
1264 * Free the host once all references to it have been dropped.
1266 void mmc_free_host(struct mmc_host *host)
1268 flush_scheduled_work();
1269 mmc_free_host_sysfs(host);
1272 EXPORT_SYMBOL(mmc_free_host);
1277 * mmc_suspend_host - suspend a host
1279 * @state: suspend mode (PM_SUSPEND_xxx)
1281 int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
1283 mmc_claim_host(host);
1284 mmc_deselect_cards(host);
1285 mmc_power_off(host);
1286 mmc_release_host(host);
1291 EXPORT_SYMBOL(mmc_suspend_host);
1294 * mmc_resume_host - resume a previously suspended host
1297 int mmc_resume_host(struct mmc_host *host)
1304 EXPORT_SYMBOL(mmc_resume_host);
1308 MODULE_LICENSE("GPL");