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");