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>
30 #ifdef CONFIG_MMC_DEBUG
31 #define DBG(x...) printk(KERN_DEBUG x)
33 #define DBG(x...) do { } while (0)
39 * OCR Bit positions to 10s of Vdd mV.
41 static const unsigned short mmc_ocr_bit_to_vdd[] = {
42 150, 155, 160, 165, 170, 180, 190, 200,
43 210, 220, 230, 240, 250, 260, 270, 280,
44 290, 300, 310, 320, 330, 340, 350, 360
47 static const unsigned int tran_exp[] = {
48 10000, 100000, 1000000, 10000000,
52 static const unsigned char tran_mant[] = {
53 0, 10, 12, 13, 15, 20, 25, 30,
54 35, 40, 45, 50, 55, 60, 70, 80,
57 static const unsigned int tacc_exp[] = {
58 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
61 static const unsigned int tacc_mant[] = {
62 0, 10, 12, 13, 15, 20, 25, 30,
63 35, 40, 45, 50, 55, 60, 70, 80,
68 * mmc_request_done - finish processing an MMC command
69 * @host: MMC host which completed command
70 * @mrq: MMC request which completed
72 * MMC drivers should call this function when they have completed
73 * their processing of a command. This should be called before the
74 * data part of the command has completed.
76 void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
78 struct mmc_command *cmd = mrq->cmd;
79 int err = mrq->cmd->error;
80 DBG("MMC: req done (%02x): %d: %08x %08x %08x %08x\n", cmd->opcode,
81 err, cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]);
83 if (err && cmd->retries) {
86 host->ops->request(host, mrq);
87 } else if (mrq->done) {
92 EXPORT_SYMBOL(mmc_request_done);
95 * mmc_start_request - start a command on a host
96 * @host: MMC host to start command on
97 * @mrq: MMC request to start
99 * Queue a command on the specified host. We expect the
100 * caller to be holding the host lock with interrupts disabled.
103 mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
105 DBG("MMC: starting cmd %02x arg %08x flags %08x\n",
106 mrq->cmd->opcode, mrq->cmd->arg, mrq->cmd->flags);
108 WARN_ON(host->card_busy == NULL);
113 mrq->cmd->data = mrq->data;
114 mrq->data->error = 0;
115 mrq->data->mrq = mrq;
117 mrq->data->stop = mrq->stop;
118 mrq->stop->error = 0;
119 mrq->stop->mrq = mrq;
122 host->ops->request(host, mrq);
125 EXPORT_SYMBOL(mmc_start_request);
127 static void mmc_wait_done(struct mmc_request *mrq)
129 complete(mrq->done_data);
132 int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
134 DECLARE_COMPLETION(complete);
136 mrq->done_data = &complete;
137 mrq->done = mmc_wait_done;
139 mmc_start_request(host, mrq);
141 wait_for_completion(&complete);
146 EXPORT_SYMBOL(mmc_wait_for_req);
149 * mmc_wait_for_cmd - start a command and wait for completion
150 * @host: MMC host to start command
151 * @cmd: MMC command to start
152 * @retries: maximum number of retries
154 * Start a new MMC command for a host, and wait for the command
155 * to complete. Return any error that occurred while the command
156 * was executing. Do not attempt to parse the response.
158 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
160 struct mmc_request mrq;
162 BUG_ON(host->card_busy == NULL);
164 memset(&mrq, 0, sizeof(struct mmc_request));
166 memset(cmd->resp, 0, sizeof(cmd->resp));
167 cmd->retries = retries;
172 mmc_wait_for_req(host, &mrq);
177 EXPORT_SYMBOL(mmc_wait_for_cmd);
180 * mmc_wait_for_app_cmd - start an application command and wait for
182 * @host: MMC host to start command
183 * @rca: RCA to send MMC_APP_CMD to
184 * @cmd: MMC command to start
185 * @retries: maximum number of retries
187 * Sends a MMC_APP_CMD, checks the card response, sends the command
188 * in the parameter and waits for it to complete. Return any error
189 * that occurred while the command was executing. Do not attempt to
190 * parse the response.
192 int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca,
193 struct mmc_command *cmd, int retries)
195 struct mmc_request mrq;
196 struct mmc_command appcmd;
200 BUG_ON(host->card_busy == NULL);
203 err = MMC_ERR_INVALID;
206 * We have to resend MMC_APP_CMD for each attempt so
207 * we cannot use the retries field in mmc_command.
209 for (i = 0;i <= retries;i++) {
210 memset(&mrq, 0, sizeof(struct mmc_request));
212 appcmd.opcode = MMC_APP_CMD;
213 appcmd.arg = rca << 16;
214 appcmd.flags = MMC_RSP_R1;
216 memset(appcmd.resp, 0, sizeof(appcmd.resp));
222 mmc_wait_for_req(host, &mrq);
229 /* Check that card supported application commands */
230 if (!(appcmd.resp[0] & R1_APP_CMD))
231 return MMC_ERR_FAILED;
233 memset(&mrq, 0, sizeof(struct mmc_request));
235 memset(cmd->resp, 0, sizeof(cmd->resp));
241 mmc_wait_for_req(host, &mrq);
244 if (cmd->error == MMC_ERR_NONE)
251 EXPORT_SYMBOL(mmc_wait_for_app_cmd);
253 static int mmc_select_card(struct mmc_host *host, struct mmc_card *card);
256 * __mmc_claim_host - exclusively claim a host
257 * @host: mmc host to claim
258 * @card: mmc card to claim host for
260 * Claim a host for a set of operations. If a valid card
261 * is passed and this wasn't the last card selected, select
262 * the card before returning.
264 * Note: you should use mmc_card_claim_host or mmc_claim_host.
266 int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card)
268 DECLARE_WAITQUEUE(wait, current);
272 add_wait_queue(&host->wq, &wait);
273 spin_lock_irqsave(&host->lock, flags);
275 set_current_state(TASK_UNINTERRUPTIBLE);
276 if (host->card_busy == NULL)
278 spin_unlock_irqrestore(&host->lock, flags);
280 spin_lock_irqsave(&host->lock, flags);
282 set_current_state(TASK_RUNNING);
283 host->card_busy = card;
284 spin_unlock_irqrestore(&host->lock, flags);
285 remove_wait_queue(&host->wq, &wait);
287 if (card != (void *)-1) {
288 err = mmc_select_card(host, card);
289 if (err != MMC_ERR_NONE)
296 EXPORT_SYMBOL(__mmc_claim_host);
299 * mmc_release_host - release a host
300 * @host: mmc host to release
302 * Release a MMC host, allowing others to claim the host
303 * for their operations.
305 void mmc_release_host(struct mmc_host *host)
309 BUG_ON(host->card_busy == NULL);
311 spin_lock_irqsave(&host->lock, flags);
312 host->card_busy = NULL;
313 spin_unlock_irqrestore(&host->lock, flags);
318 EXPORT_SYMBOL(mmc_release_host);
320 static int mmc_select_card(struct mmc_host *host, struct mmc_card *card)
323 struct mmc_command cmd;
325 BUG_ON(host->card_busy == NULL);
327 if (host->card_selected == card)
330 host->card_selected = card;
332 cmd.opcode = MMC_SELECT_CARD;
333 cmd.arg = card->rca << 16;
334 cmd.flags = MMC_RSP_R1;
336 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
337 if (err != MMC_ERR_NONE)
341 * Default bus width is 1 bit.
343 host->ios.bus_width = MMC_BUS_WIDTH_1;
346 * We can only change the bus width of the selected
347 * card so therefore we have to put the handling
350 if (host->caps & MMC_CAP_4_BIT_DATA) {
352 * The card is in 1 bit mode by default so
353 * we only need to change if it supports the
356 if (mmc_card_sd(card) &&
357 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
358 struct mmc_command cmd;
359 cmd.opcode = SD_APP_SET_BUS_WIDTH;
360 cmd.arg = SD_BUS_WIDTH_4;
361 cmd.flags = MMC_RSP_R1;
363 err = mmc_wait_for_app_cmd(host, card->rca, &cmd,
365 if (err != MMC_ERR_NONE)
368 host->ios.bus_width = MMC_BUS_WIDTH_4;
372 host->ops->set_ios(host, &host->ios);
378 * Ensure that no card is selected.
380 static void mmc_deselect_cards(struct mmc_host *host)
382 struct mmc_command cmd;
384 if (host->card_selected) {
385 host->card_selected = NULL;
387 cmd.opcode = MMC_SELECT_CARD;
389 cmd.flags = MMC_RSP_NONE;
391 mmc_wait_for_cmd(host, &cmd, 0);
396 static inline void mmc_delay(unsigned int ms)
398 if (ms < HZ / 1000) {
402 msleep_interruptible (ms);
407 * Mask off any voltages we don't support and select
410 static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
414 ocr &= host->ocr_avail;
423 host->ops->set_ios(host, &host->ios);
431 #define UNSTUFF_BITS(resp,start,size) \
433 const int __size = size; \
434 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
435 const int __off = 3 - ((start) / 32); \
436 const int __shft = (start) & 31; \
439 __res = resp[__off] >> __shft; \
440 if (__size + __shft > 32) \
441 __res |= resp[__off-1] << ((32 - __shft) % 32); \
446 * Given the decoded CSD structure, decode the raw CID to our CID structure.
448 static void mmc_decode_cid(struct mmc_card *card)
450 u32 *resp = card->raw_cid;
452 memset(&card->cid, 0, sizeof(struct mmc_cid));
454 if (mmc_card_sd(card)) {
456 * SD doesn't currently have a version field so we will
457 * have to assume we can parse this.
459 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
460 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
461 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
462 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
463 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
464 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
465 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
466 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
467 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
468 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
469 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
470 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
472 card->cid.year += 2000; /* SD cards year offset */
475 * The selection of the format here is based upon published
476 * specs from sandisk and from what people have reported.
478 switch (card->csd.mmca_vsn) {
479 case 0: /* MMC v1.0 - v1.2 */
480 case 1: /* MMC v1.4 */
481 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
482 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
483 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
484 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
485 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
486 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
487 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
488 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
489 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
490 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
491 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
492 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
493 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
496 case 2: /* MMC v2.0 - v2.2 */
497 case 3: /* MMC v3.1 - v3.3 */
498 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
499 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
500 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
501 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
502 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
503 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
504 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
505 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
506 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
507 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
508 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
512 printk("%s: card has unknown MMCA version %d\n",
513 mmc_hostname(card->host), card->csd.mmca_vsn);
514 mmc_card_set_bad(card);
521 * Given a 128-bit response, decode to our card CSD structure.
523 static void mmc_decode_csd(struct mmc_card *card)
525 struct mmc_csd *csd = &card->csd;
526 unsigned int e, m, csd_struct;
527 u32 *resp = card->raw_csd;
529 if (mmc_card_sd(card)) {
530 csd_struct = UNSTUFF_BITS(resp, 126, 2);
531 if (csd_struct != 0) {
532 printk("%s: unrecognised CSD structure version %d\n",
533 mmc_hostname(card->host), csd_struct);
534 mmc_card_set_bad(card);
538 m = UNSTUFF_BITS(resp, 115, 4);
539 e = UNSTUFF_BITS(resp, 112, 3);
540 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
541 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
543 m = UNSTUFF_BITS(resp, 99, 4);
544 e = UNSTUFF_BITS(resp, 96, 3);
545 csd->max_dtr = tran_exp[e] * tran_mant[m];
546 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
548 e = UNSTUFF_BITS(resp, 47, 3);
549 m = UNSTUFF_BITS(resp, 62, 12);
550 csd->capacity = (1 + m) << (e + 2);
552 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
555 * We only understand CSD structure v1.1 and v1.2.
556 * v1.2 has extra information in bits 15, 11 and 10.
558 csd_struct = UNSTUFF_BITS(resp, 126, 2);
559 if (csd_struct != 1 && csd_struct != 2) {
560 printk("%s: unrecognised CSD structure version %d\n",
561 mmc_hostname(card->host), csd_struct);
562 mmc_card_set_bad(card);
566 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
567 m = UNSTUFF_BITS(resp, 115, 4);
568 e = UNSTUFF_BITS(resp, 112, 3);
569 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
570 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
572 m = UNSTUFF_BITS(resp, 99, 4);
573 e = UNSTUFF_BITS(resp, 96, 3);
574 csd->max_dtr = tran_exp[e] * tran_mant[m];
575 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
577 e = UNSTUFF_BITS(resp, 47, 3);
578 m = UNSTUFF_BITS(resp, 62, 12);
579 csd->capacity = (1 + m) << (e + 2);
581 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
586 * Given a 64-bit response, decode to our card SCR structure.
588 static void mmc_decode_scr(struct mmc_card *card)
590 struct sd_scr *scr = &card->scr;
591 unsigned int scr_struct;
594 BUG_ON(!mmc_card_sd(card));
596 resp[3] = card->raw_scr[1];
597 resp[2] = card->raw_scr[0];
599 scr_struct = UNSTUFF_BITS(resp, 60, 4);
600 if (scr_struct != 0) {
601 printk("%s: unrecognised SCR structure version %d\n",
602 mmc_hostname(card->host), scr_struct);
603 mmc_card_set_bad(card);
607 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
608 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
612 * Locate a MMC card on this MMC host given a raw CID.
614 static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid)
616 struct mmc_card *card;
618 list_for_each_entry(card, &host->cards, node) {
619 if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0)
626 * Allocate a new MMC card, and assign a unique RCA.
628 static struct mmc_card *
629 mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca)
631 struct mmc_card *card, *c;
632 unsigned int rca = *frca;
634 card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL);
636 return ERR_PTR(-ENOMEM);
638 mmc_init_card(card, host);
639 memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid));
642 list_for_each_entry(c, &host->cards, node)
656 * Tell attached cards to go to IDLE state
658 static void mmc_idle_cards(struct mmc_host *host)
660 struct mmc_command cmd;
662 host->ios.chip_select = MMC_CS_HIGH;
663 host->ops->set_ios(host, &host->ios);
667 cmd.opcode = MMC_GO_IDLE_STATE;
669 cmd.flags = MMC_RSP_NONE;
671 mmc_wait_for_cmd(host, &cmd, 0);
675 host->ios.chip_select = MMC_CS_DONTCARE;
676 host->ops->set_ios(host, &host->ios);
682 * Apply power to the MMC stack.
684 static void mmc_power_up(struct mmc_host *host)
686 int bit = fls(host->ocr_avail) - 1;
689 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
690 host->ios.chip_select = MMC_CS_DONTCARE;
691 host->ios.power_mode = MMC_POWER_UP;
692 host->ios.bus_width = MMC_BUS_WIDTH_1;
693 host->ops->set_ios(host, &host->ios);
697 host->ios.clock = host->f_min;
698 host->ios.power_mode = MMC_POWER_ON;
699 host->ops->set_ios(host, &host->ios);
704 static void mmc_power_off(struct mmc_host *host)
708 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
709 host->ios.chip_select = MMC_CS_DONTCARE;
710 host->ios.power_mode = MMC_POWER_OFF;
711 host->ios.bus_width = MMC_BUS_WIDTH_1;
712 host->ops->set_ios(host, &host->ios);
715 static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
717 struct mmc_command cmd;
720 cmd.opcode = MMC_SEND_OP_COND;
722 cmd.flags = MMC_RSP_R3;
724 for (i = 100; i; i--) {
725 err = mmc_wait_for_cmd(host, &cmd, 0);
726 if (err != MMC_ERR_NONE)
729 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
732 err = MMC_ERR_TIMEOUT;
743 static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
745 struct mmc_command cmd;
748 cmd.opcode = SD_APP_OP_COND;
750 cmd.flags = MMC_RSP_R3;
752 for (i = 100; i; i--) {
753 err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES);
754 if (err != MMC_ERR_NONE)
757 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
760 err = MMC_ERR_TIMEOUT;
772 * Discover cards by requesting their CID. If this command
773 * times out, it is not an error; there are no further cards
774 * to be discovered. Add new cards to the list.
776 * Create a mmc_card entry for each discovered card, assigning
777 * it an RCA, and save the raw CID for decoding later.
779 static void mmc_discover_cards(struct mmc_host *host)
781 struct mmc_card *card;
782 unsigned int first_rca = 1, err;
785 struct mmc_command cmd;
787 cmd.opcode = MMC_ALL_SEND_CID;
789 cmd.flags = MMC_RSP_R2;
791 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
792 if (err == MMC_ERR_TIMEOUT) {
796 if (err != MMC_ERR_NONE) {
797 printk(KERN_ERR "%s: error requesting CID: %d\n",
798 mmc_hostname(host), err);
802 card = mmc_find_card(host, cmd.resp);
804 card = mmc_alloc_card(host, cmd.resp, &first_rca);
809 list_add(&card->node, &host->cards);
812 card->state &= ~MMC_STATE_DEAD;
814 if (host->mode == MMC_MODE_SD) {
815 mmc_card_set_sd(card);
817 cmd.opcode = SD_SEND_RELATIVE_ADDR;
819 cmd.flags = MMC_RSP_R6;
821 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
822 if (err != MMC_ERR_NONE)
823 mmc_card_set_dead(card);
825 card->rca = cmd.resp[0] >> 16;
827 if (!host->ops->get_ro) {
828 printk(KERN_WARNING "%s: host does not "
829 "support reading read-only "
830 "switch. assuming write-enable.\n",
833 if (host->ops->get_ro(host))
834 mmc_card_set_readonly(card);
838 cmd.opcode = MMC_SET_RELATIVE_ADDR;
839 cmd.arg = card->rca << 16;
840 cmd.flags = MMC_RSP_R1;
842 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
843 if (err != MMC_ERR_NONE)
844 mmc_card_set_dead(card);
849 static void mmc_read_csds(struct mmc_host *host)
851 struct mmc_card *card;
853 list_for_each_entry(card, &host->cards, node) {
854 struct mmc_command cmd;
857 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
860 cmd.opcode = MMC_SEND_CSD;
861 cmd.arg = card->rca << 16;
862 cmd.flags = MMC_RSP_R2;
864 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
865 if (err != MMC_ERR_NONE) {
866 mmc_card_set_dead(card);
870 memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd));
872 mmc_decode_csd(card);
873 mmc_decode_cid(card);
877 static void mmc_read_scrs(struct mmc_host *host)
880 struct mmc_card *card;
882 struct mmc_request mrq;
883 struct mmc_command cmd;
884 struct mmc_data data;
886 struct scatterlist sg;
888 list_for_each_entry(card, &host->cards, node) {
889 if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT))
891 if (!mmc_card_sd(card))
894 err = mmc_select_card(host, card);
895 if (err != MMC_ERR_NONE) {
896 mmc_card_set_dead(card);
900 memset(&cmd, 0, sizeof(struct mmc_command));
902 cmd.opcode = MMC_APP_CMD;
903 cmd.arg = card->rca << 16;
904 cmd.flags = MMC_RSP_R1;
906 err = mmc_wait_for_cmd(host, &cmd, 0);
907 if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) {
908 mmc_card_set_dead(card);
912 memset(&cmd, 0, sizeof(struct mmc_command));
914 cmd.opcode = SD_APP_SEND_SCR;
916 cmd.flags = MMC_RSP_R1;
918 memset(&data, 0, sizeof(struct mmc_data));
920 data.timeout_ns = card->csd.tacc_ns * 10;
921 data.timeout_clks = card->csd.tacc_clks * 10;
924 data.flags = MMC_DATA_READ;
928 memset(&mrq, 0, sizeof(struct mmc_request));
933 sg_init_one(&sg, (u8*)card->raw_scr, 8);
935 err = mmc_wait_for_req(host, &mrq);
936 if (err != MMC_ERR_NONE) {
937 mmc_card_set_dead(card);
941 card->raw_scr[0] = ntohl(card->raw_scr[0]);
942 card->raw_scr[1] = ntohl(card->raw_scr[1]);
944 mmc_decode_scr(card);
947 mmc_deselect_cards(host);
950 static unsigned int mmc_calculate_clock(struct mmc_host *host)
952 struct mmc_card *card;
953 unsigned int max_dtr = host->f_max;
955 list_for_each_entry(card, &host->cards, node)
956 if (!mmc_card_dead(card) && max_dtr > card->csd.max_dtr)
957 max_dtr = card->csd.max_dtr;
959 DBG("MMC: selected %d.%03dMHz transfer rate\n",
960 max_dtr / 1000000, (max_dtr / 1000) % 1000);
966 * Check whether cards we already know about are still present.
967 * We do this by requesting status, and checking whether a card
970 * A request for status does not cause a state change in data
973 static void mmc_check_cards(struct mmc_host *host)
975 struct list_head *l, *n;
977 mmc_deselect_cards(host);
979 list_for_each_safe(l, n, &host->cards) {
980 struct mmc_card *card = mmc_list_to_card(l);
981 struct mmc_command cmd;
984 cmd.opcode = MMC_SEND_STATUS;
985 cmd.arg = card->rca << 16;
986 cmd.flags = MMC_RSP_R1;
988 err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
989 if (err == MMC_ERR_NONE)
992 mmc_card_set_dead(card);
996 static void mmc_setup(struct mmc_host *host)
998 if (host->ios.power_mode != MMC_POWER_ON) {
1002 host->mode = MMC_MODE_SD;
1005 mmc_idle_cards(host);
1007 err = mmc_send_app_op_cond(host, 0, &ocr);
1010 * If we fail to detect any SD cards then try
1011 * searching for MMC cards.
1013 if (err != MMC_ERR_NONE) {
1014 host->mode = MMC_MODE_MMC;
1016 err = mmc_send_op_cond(host, 0, &ocr);
1017 if (err != MMC_ERR_NONE)
1021 host->ocr = mmc_select_voltage(host, ocr);
1024 * Since we're changing the OCR value, we seem to
1025 * need to tell some cards to go back to the idle
1026 * state. We wait 1ms to give cards time to
1030 mmc_idle_cards(host);
1032 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1033 host->ios.clock = host->f_min;
1034 host->ops->set_ios(host, &host->ios);
1037 * We should remember the OCR mask from the existing
1038 * cards, and detect the new cards OCR mask, combine
1039 * the two and re-select the VDD. However, if we do
1040 * change VDD, we should do an idle, and then do a
1041 * full re-initialisation. We would need to notify
1042 * drivers so that they can re-setup the cards as
1043 * well, while keeping their queues at bay.
1045 * For the moment, we take the easy way out - if the
1046 * new cards don't like our currently selected VDD,
1047 * they drop off the bus.
1055 * Send the selected OCR multiple times... until the cards
1056 * all get the idea that they should be ready for CMD2.
1057 * (My SanDisk card seems to need this.)
1059 if (host->mode == MMC_MODE_SD)
1060 mmc_send_app_op_cond(host, host->ocr, NULL);
1062 mmc_send_op_cond(host, host->ocr, NULL);
1064 mmc_discover_cards(host);
1067 * Ok, now switch to push-pull mode.
1069 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1070 host->ops->set_ios(host, &host->ios);
1072 mmc_read_csds(host);
1074 if (host->mode == MMC_MODE_SD)
1075 mmc_read_scrs(host);
1080 * mmc_detect_change - process change of state on a MMC socket
1081 * @host: host which changed state.
1082 * @delay: optional delay to wait before detection (jiffies)
1084 * All we know is that card(s) have been inserted or removed
1085 * from the socket(s). We don't know which socket or cards.
1087 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1090 schedule_delayed_work(&host->detect, delay);
1092 schedule_work(&host->detect);
1095 EXPORT_SYMBOL(mmc_detect_change);
1098 static void mmc_rescan(void *data)
1100 struct mmc_host *host = data;
1101 struct list_head *l, *n;
1103 mmc_claim_host(host);
1105 if (host->ios.power_mode == MMC_POWER_ON)
1106 mmc_check_cards(host);
1110 if (!list_empty(&host->cards)) {
1112 * (Re-)calculate the fastest clock rate which the
1113 * attached cards and the host support.
1115 host->ios.clock = mmc_calculate_clock(host);
1116 host->ops->set_ios(host, &host->ios);
1119 mmc_release_host(host);
1121 list_for_each_safe(l, n, &host->cards) {
1122 struct mmc_card *card = mmc_list_to_card(l);
1125 * If this is a new and good card, register it.
1127 if (!mmc_card_present(card) && !mmc_card_dead(card)) {
1128 if (mmc_register_card(card))
1129 mmc_card_set_dead(card);
1131 mmc_card_set_present(card);
1135 * If this card is dead, destroy it.
1137 if (mmc_card_dead(card)) {
1138 list_del(&card->node);
1139 mmc_remove_card(card);
1144 * If we discover that there are no cards on the
1145 * bus, turn off the clock and power down.
1147 if (list_empty(&host->cards))
1148 mmc_power_off(host);
1153 * mmc_alloc_host - initialise the per-host structure.
1154 * @extra: sizeof private data structure
1155 * @dev: pointer to host device model structure
1157 * Initialise the per-host structure.
1159 struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
1161 struct mmc_host *host;
1163 host = mmc_alloc_host_sysfs(extra, dev);
1165 spin_lock_init(&host->lock);
1166 init_waitqueue_head(&host->wq);
1167 INIT_LIST_HEAD(&host->cards);
1168 INIT_WORK(&host->detect, mmc_rescan, host);
1171 * By default, hosts do not support SGIO or large requests.
1172 * They have to set these according to their abilities.
1174 host->max_hw_segs = 1;
1175 host->max_phys_segs = 1;
1176 host->max_sectors = 1 << (PAGE_CACHE_SHIFT - 9);
1177 host->max_seg_size = PAGE_CACHE_SIZE;
1183 EXPORT_SYMBOL(mmc_alloc_host);
1186 * mmc_add_host - initialise host hardware
1189 int mmc_add_host(struct mmc_host *host)
1193 ret = mmc_add_host_sysfs(host);
1195 mmc_power_off(host);
1196 mmc_detect_change(host, 0);
1202 EXPORT_SYMBOL(mmc_add_host);
1205 * mmc_remove_host - remove host hardware
1208 * Unregister and remove all cards associated with this host,
1209 * and power down the MMC bus.
1211 void mmc_remove_host(struct mmc_host *host)
1213 struct list_head *l, *n;
1215 list_for_each_safe(l, n, &host->cards) {
1216 struct mmc_card *card = mmc_list_to_card(l);
1218 mmc_remove_card(card);
1221 mmc_power_off(host);
1222 mmc_remove_host_sysfs(host);
1225 EXPORT_SYMBOL(mmc_remove_host);
1228 * mmc_free_host - free the host structure
1231 * Free the host once all references to it have been dropped.
1233 void mmc_free_host(struct mmc_host *host)
1235 flush_scheduled_work();
1236 mmc_free_host_sysfs(host);
1239 EXPORT_SYMBOL(mmc_free_host);
1244 * mmc_suspend_host - suspend a host
1246 * @state: suspend mode (PM_SUSPEND_xxx)
1248 int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
1250 mmc_claim_host(host);
1251 mmc_deselect_cards(host);
1252 mmc_power_off(host);
1253 mmc_release_host(host);
1258 EXPORT_SYMBOL(mmc_suspend_host);
1261 * mmc_resume_host - resume a previously suspended host
1264 int mmc_resume_host(struct mmc_host *host)
1271 EXPORT_SYMBOL(mmc_resume_host);
1275 MODULE_LICENSE("GPL");