2 * linux/drivers/mmc/mmc.c
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 #include <linux/config.h>
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <linux/completion.h>
15 #include <linux/device.h>
16 #include <linux/delay.h>
17 #include <linux/pagemap.h>
18 #include <linux/err.h>
19 #include <asm/scatterlist.h>
20 #include <linux/scatterlist.h>
22 #include <linux/mmc/card.h>
23 #include <linux/mmc/host.h>
24 #include <linux/mmc/protocol.h>
28 #ifdef CONFIG_MMC_DEBUG
29 #define DBG(x...) printk(KERN_DEBUG x)
31 #define DBG(x...) do { } while (0)
37 * OCR Bit positions to 10s of Vdd mV.
39 static const unsigned short mmc_ocr_bit_to_vdd
[] = {
40 150, 155, 160, 165, 170, 180, 190, 200,
41 210, 220, 230, 240, 250, 260, 270, 280,
42 290, 300, 310, 320, 330, 340, 350, 360
45 static const unsigned int tran_exp
[] = {
46 10000, 100000, 1000000, 10000000,
50 static const unsigned char tran_mant
[] = {
51 0, 10, 12, 13, 15, 20, 25, 30,
52 35, 40, 45, 50, 55, 60, 70, 80,
55 static const unsigned int tacc_exp
[] = {
56 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
59 static const unsigned int tacc_mant
[] = {
60 0, 10, 12, 13, 15, 20, 25, 30,
61 35, 40, 45, 50, 55, 60, 70, 80,
66 * mmc_request_done - finish processing an MMC command
67 * @host: MMC host which completed command
68 * @mrq: MMC request which completed
70 * MMC drivers should call this function when they have completed
71 * their processing of a command. This should be called before the
72 * data part of the command has completed.
74 void mmc_request_done(struct mmc_host
*host
, struct mmc_request
*mrq
)
76 struct mmc_command
*cmd
= mrq
->cmd
;
77 int err
= mrq
->cmd
->error
;
78 DBG("MMC: req done (%02x): %d: %08x %08x %08x %08x\n", cmd
->opcode
,
79 err
, cmd
->resp
[0], cmd
->resp
[1], cmd
->resp
[2], cmd
->resp
[3]);
81 if (err
&& cmd
->retries
) {
84 host
->ops
->request(host
, mrq
);
85 } else if (mrq
->done
) {
90 EXPORT_SYMBOL(mmc_request_done
);
93 * mmc_start_request - start a command on a host
94 * @host: MMC host to start command on
95 * @mrq: MMC request to start
97 * Queue a command on the specified host. We expect the
98 * caller to be holding the host lock with interrupts disabled.
101 mmc_start_request(struct mmc_host
*host
, struct mmc_request
*mrq
)
103 DBG("MMC: starting cmd %02x arg %08x flags %08x\n",
104 mrq
->cmd
->opcode
, 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
;
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 int mmc_select_card(struct mmc_host
*host
, struct mmc_card
*card
)
321 struct mmc_command cmd
;
323 BUG_ON(host
->card_busy
== NULL
);
325 if (host
->card_selected
== card
)
328 host
->card_selected
= card
;
330 cmd
.opcode
= MMC_SELECT_CARD
;
331 cmd
.arg
= card
->rca
<< 16;
332 cmd
.flags
= MMC_RSP_R1
;
334 err
= mmc_wait_for_cmd(host
, &cmd
, CMD_RETRIES
);
335 if (err
!= MMC_ERR_NONE
)
342 * Ensure that no card is selected.
344 static void mmc_deselect_cards(struct mmc_host
*host
)
346 struct mmc_command cmd
;
348 if (host
->card_selected
) {
349 host
->card_selected
= NULL
;
351 cmd
.opcode
= MMC_SELECT_CARD
;
353 cmd
.flags
= MMC_RSP_NONE
;
355 mmc_wait_for_cmd(host
, &cmd
, 0);
360 static inline void mmc_delay(unsigned int ms
)
362 if (ms
< HZ
/ 1000) {
366 msleep_interruptible (ms
);
371 * Mask off any voltages we don't support and select
374 static u32
mmc_select_voltage(struct mmc_host
*host
, u32 ocr
)
378 ocr
&= host
->ocr_avail
;
387 host
->ops
->set_ios(host
, &host
->ios
);
395 #define UNSTUFF_BITS(resp,start,size) \
397 const int __size = size; \
398 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
399 const int __off = 3 - ((start) / 32); \
400 const int __shft = (start) & 31; \
403 __res = resp[__off] >> __shft; \
404 if (__size + __shft > 32) \
405 __res |= resp[__off-1] << ((32 - __shft) % 32); \
410 * Given the decoded CSD structure, decode the raw CID to our CID structure.
412 static void mmc_decode_cid(struct mmc_card
*card
)
414 u32
*resp
= card
->raw_cid
;
416 memset(&card
->cid
, 0, sizeof(struct mmc_cid
));
418 if (mmc_card_sd(card
)) {
420 * SD doesn't currently have a version field so we will
421 * have to assume we can parse this.
423 card
->cid
.manfid
= UNSTUFF_BITS(resp
, 120, 8);
424 card
->cid
.oemid
= UNSTUFF_BITS(resp
, 104, 16);
425 card
->cid
.prod_name
[0] = UNSTUFF_BITS(resp
, 96, 8);
426 card
->cid
.prod_name
[1] = UNSTUFF_BITS(resp
, 88, 8);
427 card
->cid
.prod_name
[2] = UNSTUFF_BITS(resp
, 80, 8);
428 card
->cid
.prod_name
[3] = UNSTUFF_BITS(resp
, 72, 8);
429 card
->cid
.prod_name
[4] = UNSTUFF_BITS(resp
, 64, 8);
430 card
->cid
.hwrev
= UNSTUFF_BITS(resp
, 60, 4);
431 card
->cid
.fwrev
= UNSTUFF_BITS(resp
, 56, 4);
432 card
->cid
.serial
= UNSTUFF_BITS(resp
, 24, 32);
433 card
->cid
.year
= UNSTUFF_BITS(resp
, 12, 8);
434 card
->cid
.month
= UNSTUFF_BITS(resp
, 8, 4);
436 card
->cid
.year
+= 2000; /* SD cards year offset */
439 * The selection of the format here is based upon published
440 * specs from sandisk and from what people have reported.
442 switch (card
->csd
.mmca_vsn
) {
443 case 0: /* MMC v1.0 - v1.2 */
444 case 1: /* MMC v1.4 */
445 card
->cid
.manfid
= UNSTUFF_BITS(resp
, 104, 24);
446 card
->cid
.prod_name
[0] = UNSTUFF_BITS(resp
, 96, 8);
447 card
->cid
.prod_name
[1] = UNSTUFF_BITS(resp
, 88, 8);
448 card
->cid
.prod_name
[2] = UNSTUFF_BITS(resp
, 80, 8);
449 card
->cid
.prod_name
[3] = UNSTUFF_BITS(resp
, 72, 8);
450 card
->cid
.prod_name
[4] = UNSTUFF_BITS(resp
, 64, 8);
451 card
->cid
.prod_name
[5] = UNSTUFF_BITS(resp
, 56, 8);
452 card
->cid
.prod_name
[6] = UNSTUFF_BITS(resp
, 48, 8);
453 card
->cid
.hwrev
= UNSTUFF_BITS(resp
, 44, 4);
454 card
->cid
.fwrev
= UNSTUFF_BITS(resp
, 40, 4);
455 card
->cid
.serial
= UNSTUFF_BITS(resp
, 16, 24);
456 card
->cid
.month
= UNSTUFF_BITS(resp
, 12, 4);
457 card
->cid
.year
= UNSTUFF_BITS(resp
, 8, 4) + 1997;
460 case 2: /* MMC v2.0 - v2.2 */
461 case 3: /* MMC v3.1 - v3.3 */
462 card
->cid
.manfid
= UNSTUFF_BITS(resp
, 120, 8);
463 card
->cid
.oemid
= UNSTUFF_BITS(resp
, 104, 16);
464 card
->cid
.prod_name
[0] = UNSTUFF_BITS(resp
, 96, 8);
465 card
->cid
.prod_name
[1] = UNSTUFF_BITS(resp
, 88, 8);
466 card
->cid
.prod_name
[2] = UNSTUFF_BITS(resp
, 80, 8);
467 card
->cid
.prod_name
[3] = UNSTUFF_BITS(resp
, 72, 8);
468 card
->cid
.prod_name
[4] = UNSTUFF_BITS(resp
, 64, 8);
469 card
->cid
.prod_name
[5] = UNSTUFF_BITS(resp
, 56, 8);
470 card
->cid
.serial
= UNSTUFF_BITS(resp
, 16, 32);
471 card
->cid
.month
= UNSTUFF_BITS(resp
, 12, 4);
472 card
->cid
.year
= UNSTUFF_BITS(resp
, 8, 4) + 1997;
476 printk("%s: card has unknown MMCA version %d\n",
477 mmc_hostname(card
->host
), card
->csd
.mmca_vsn
);
478 mmc_card_set_bad(card
);
485 * Given a 128-bit response, decode to our card CSD structure.
487 static void mmc_decode_csd(struct mmc_card
*card
)
489 struct mmc_csd
*csd
= &card
->csd
;
490 unsigned int e
, m
, csd_struct
;
491 u32
*resp
= card
->raw_csd
;
493 if (mmc_card_sd(card
)) {
494 csd_struct
= UNSTUFF_BITS(resp
, 126, 2);
495 if (csd_struct
!= 0) {
496 printk("%s: unrecognised CSD structure version %d\n",
497 mmc_hostname(card
->host
), csd_struct
);
498 mmc_card_set_bad(card
);
502 m
= UNSTUFF_BITS(resp
, 115, 4);
503 e
= UNSTUFF_BITS(resp
, 112, 3);
504 csd
->tacc_ns
= (tacc_exp
[e
] * tacc_mant
[m
] + 9) / 10;
505 csd
->tacc_clks
= UNSTUFF_BITS(resp
, 104, 8) * 100;
507 m
= UNSTUFF_BITS(resp
, 99, 4);
508 e
= UNSTUFF_BITS(resp
, 96, 3);
509 csd
->max_dtr
= tran_exp
[e
] * tran_mant
[m
];
510 csd
->cmdclass
= UNSTUFF_BITS(resp
, 84, 12);
512 e
= UNSTUFF_BITS(resp
, 47, 3);
513 m
= UNSTUFF_BITS(resp
, 62, 12);
514 csd
->capacity
= (1 + m
) << (e
+ 2);
516 csd
->read_blkbits
= UNSTUFF_BITS(resp
, 80, 4);
519 * We only understand CSD structure v1.1 and v1.2.
520 * v1.2 has extra information in bits 15, 11 and 10.
522 csd_struct
= UNSTUFF_BITS(resp
, 126, 2);
523 if (csd_struct
!= 1 && csd_struct
!= 2) {
524 printk("%s: unrecognised CSD structure version %d\n",
525 mmc_hostname(card
->host
), csd_struct
);
526 mmc_card_set_bad(card
);
530 csd
->mmca_vsn
= UNSTUFF_BITS(resp
, 122, 4);
531 m
= UNSTUFF_BITS(resp
, 115, 4);
532 e
= UNSTUFF_BITS(resp
, 112, 3);
533 csd
->tacc_ns
= (tacc_exp
[e
] * tacc_mant
[m
] + 9) / 10;
534 csd
->tacc_clks
= UNSTUFF_BITS(resp
, 104, 8) * 100;
536 m
= UNSTUFF_BITS(resp
, 99, 4);
537 e
= UNSTUFF_BITS(resp
, 96, 3);
538 csd
->max_dtr
= tran_exp
[e
] * tran_mant
[m
];
539 csd
->cmdclass
= UNSTUFF_BITS(resp
, 84, 12);
541 e
= UNSTUFF_BITS(resp
, 47, 3);
542 m
= UNSTUFF_BITS(resp
, 62, 12);
543 csd
->capacity
= (1 + m
) << (e
+ 2);
545 csd
->read_blkbits
= UNSTUFF_BITS(resp
, 80, 4);
550 * Given a 64-bit response, decode to our card SCR structure.
552 static void mmc_decode_scr(struct mmc_card
*card
)
554 struct sd_scr
*scr
= &card
->scr
;
555 unsigned int scr_struct
;
558 BUG_ON(!mmc_card_sd(card
));
560 resp
[3] = card
->raw_scr
[1];
561 resp
[2] = card
->raw_scr
[0];
563 scr_struct
= UNSTUFF_BITS(resp
, 60, 4);
564 if (scr_struct
!= 0) {
565 printk("%s: unrecognised SCR structure version %d\n",
566 mmc_hostname(card
->host
), scr_struct
);
567 mmc_card_set_bad(card
);
571 scr
->sda_vsn
= UNSTUFF_BITS(resp
, 56, 4);
572 scr
->bus_widths
= UNSTUFF_BITS(resp
, 48, 4);
576 * Locate a MMC card on this MMC host given a raw CID.
578 static struct mmc_card
*mmc_find_card(struct mmc_host
*host
, u32
*raw_cid
)
580 struct mmc_card
*card
;
582 list_for_each_entry(card
, &host
->cards
, node
) {
583 if (memcmp(card
->raw_cid
, raw_cid
, sizeof(card
->raw_cid
)) == 0)
590 * Allocate a new MMC card, and assign a unique RCA.
592 static struct mmc_card
*
593 mmc_alloc_card(struct mmc_host
*host
, u32
*raw_cid
, unsigned int *frca
)
595 struct mmc_card
*card
, *c
;
596 unsigned int rca
= *frca
;
598 card
= kmalloc(sizeof(struct mmc_card
), GFP_KERNEL
);
600 return ERR_PTR(-ENOMEM
);
602 mmc_init_card(card
, host
);
603 memcpy(card
->raw_cid
, raw_cid
, sizeof(card
->raw_cid
));
606 list_for_each_entry(c
, &host
->cards
, node
)
620 * Tell attached cards to go to IDLE state
622 static void mmc_idle_cards(struct mmc_host
*host
)
624 struct mmc_command cmd
;
626 host
->ios
.chip_select
= MMC_CS_HIGH
;
627 host
->ops
->set_ios(host
, &host
->ios
);
631 cmd
.opcode
= MMC_GO_IDLE_STATE
;
633 cmd
.flags
= MMC_RSP_NONE
;
635 mmc_wait_for_cmd(host
, &cmd
, 0);
639 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
640 host
->ops
->set_ios(host
, &host
->ios
);
646 * Apply power to the MMC stack.
648 static void mmc_power_up(struct mmc_host
*host
)
650 int bit
= fls(host
->ocr_avail
) - 1;
653 host
->ios
.bus_mode
= MMC_BUSMODE_OPENDRAIN
;
654 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
655 host
->ios
.power_mode
= MMC_POWER_UP
;
656 host
->ops
->set_ios(host
, &host
->ios
);
660 host
->ios
.clock
= host
->f_min
;
661 host
->ios
.power_mode
= MMC_POWER_ON
;
662 host
->ops
->set_ios(host
, &host
->ios
);
667 static void mmc_power_off(struct mmc_host
*host
)
671 host
->ios
.bus_mode
= MMC_BUSMODE_OPENDRAIN
;
672 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
673 host
->ios
.power_mode
= MMC_POWER_OFF
;
674 host
->ops
->set_ios(host
, &host
->ios
);
677 static int mmc_send_op_cond(struct mmc_host
*host
, u32 ocr
, u32
*rocr
)
679 struct mmc_command cmd
;
682 cmd
.opcode
= MMC_SEND_OP_COND
;
684 cmd
.flags
= MMC_RSP_R3
;
686 for (i
= 100; i
; i
--) {
687 err
= mmc_wait_for_cmd(host
, &cmd
, 0);
688 if (err
!= MMC_ERR_NONE
)
691 if (cmd
.resp
[0] & MMC_CARD_BUSY
|| ocr
== 0)
694 err
= MMC_ERR_TIMEOUT
;
705 static int mmc_send_app_op_cond(struct mmc_host
*host
, u32 ocr
, u32
*rocr
)
707 struct mmc_command cmd
;
710 cmd
.opcode
= SD_APP_OP_COND
;
712 cmd
.flags
= MMC_RSP_R3
;
714 for (i
= 100; i
; i
--) {
715 err
= mmc_wait_for_app_cmd(host
, 0, &cmd
, CMD_RETRIES
);
716 if (err
!= MMC_ERR_NONE
)
719 if (cmd
.resp
[0] & MMC_CARD_BUSY
|| ocr
== 0)
722 err
= MMC_ERR_TIMEOUT
;
734 * Discover cards by requesting their CID. If this command
735 * times out, it is not an error; there are no further cards
736 * to be discovered. Add new cards to the list.
738 * Create a mmc_card entry for each discovered card, assigning
739 * it an RCA, and save the raw CID for decoding later.
741 static void mmc_discover_cards(struct mmc_host
*host
)
743 struct mmc_card
*card
;
744 unsigned int first_rca
= 1, err
;
747 struct mmc_command cmd
;
749 cmd
.opcode
= MMC_ALL_SEND_CID
;
751 cmd
.flags
= MMC_RSP_R2
;
753 err
= mmc_wait_for_cmd(host
, &cmd
, CMD_RETRIES
);
754 if (err
== MMC_ERR_TIMEOUT
) {
758 if (err
!= MMC_ERR_NONE
) {
759 printk(KERN_ERR
"%s: error requesting CID: %d\n",
760 mmc_hostname(host
), err
);
764 card
= mmc_find_card(host
, cmd
.resp
);
766 card
= mmc_alloc_card(host
, cmd
.resp
, &first_rca
);
771 list_add(&card
->node
, &host
->cards
);
774 card
->state
&= ~MMC_STATE_DEAD
;
776 if (host
->mode
== MMC_MODE_SD
) {
777 mmc_card_set_sd(card
);
779 cmd
.opcode
= SD_SEND_RELATIVE_ADDR
;
781 cmd
.flags
= MMC_RSP_R1
;
783 err
= mmc_wait_for_cmd(host
, &cmd
, CMD_RETRIES
);
784 if (err
!= MMC_ERR_NONE
)
785 mmc_card_set_dead(card
);
787 card
->rca
= cmd
.resp
[0] >> 16;
789 if (!host
->ops
->get_ro
) {
790 printk(KERN_WARNING
"%s: host does not "
791 "support reading read-only "
792 "switch. assuming write-enable.\n",
795 if (host
->ops
->get_ro(host
))
796 mmc_card_set_readonly(card
);
800 cmd
.opcode
= MMC_SET_RELATIVE_ADDR
;
801 cmd
.arg
= card
->rca
<< 16;
802 cmd
.flags
= MMC_RSP_R1
;
804 err
= mmc_wait_for_cmd(host
, &cmd
, CMD_RETRIES
);
805 if (err
!= MMC_ERR_NONE
)
806 mmc_card_set_dead(card
);
811 static void mmc_read_csds(struct mmc_host
*host
)
813 struct mmc_card
*card
;
815 list_for_each_entry(card
, &host
->cards
, node
) {
816 struct mmc_command cmd
;
819 if (card
->state
& (MMC_STATE_DEAD
|MMC_STATE_PRESENT
))
822 cmd
.opcode
= MMC_SEND_CSD
;
823 cmd
.arg
= card
->rca
<< 16;
824 cmd
.flags
= MMC_RSP_R2
;
826 err
= mmc_wait_for_cmd(host
, &cmd
, CMD_RETRIES
);
827 if (err
!= MMC_ERR_NONE
) {
828 mmc_card_set_dead(card
);
832 memcpy(card
->raw_csd
, cmd
.resp
, sizeof(card
->raw_csd
));
834 mmc_decode_csd(card
);
835 mmc_decode_cid(card
);
839 static void mmc_read_scrs(struct mmc_host
*host
)
842 struct mmc_card
*card
;
844 struct mmc_request mrq
;
845 struct mmc_command cmd
;
846 struct mmc_data data
;
848 struct scatterlist sg
;
850 list_for_each_entry(card
, &host
->cards
, node
) {
851 if (card
->state
& (MMC_STATE_DEAD
|MMC_STATE_PRESENT
))
853 if (!mmc_card_sd(card
))
856 err
= mmc_select_card(host
, card
);
857 if (err
!= MMC_ERR_NONE
) {
858 mmc_card_set_dead(card
);
862 memset(&cmd
, 0, sizeof(struct mmc_command
));
864 cmd
.opcode
= MMC_APP_CMD
;
865 cmd
.arg
= card
->rca
<< 16;
866 cmd
.flags
= MMC_RSP_R1
;
868 err
= mmc_wait_for_cmd(host
, &cmd
, 0);
869 if ((err
!= MMC_ERR_NONE
) || !(cmd
.resp
[0] & R1_APP_CMD
)) {
870 mmc_card_set_dead(card
);
874 memset(&cmd
, 0, sizeof(struct mmc_command
));
876 cmd
.opcode
= SD_APP_SEND_SCR
;
878 cmd
.flags
= MMC_RSP_R1
;
880 memset(&data
, 0, sizeof(struct mmc_data
));
882 data
.timeout_ns
= card
->csd
.tacc_ns
* 10;
883 data
.timeout_clks
= card
->csd
.tacc_clks
* 10;
886 data
.flags
= MMC_DATA_READ
;
890 memset(&mrq
, 0, sizeof(struct mmc_request
));
895 sg_init_one(&sg
, (u8
*)card
->raw_scr
, 8);
897 err
= mmc_wait_for_req(host
, &mrq
);
898 if (err
!= MMC_ERR_NONE
) {
899 mmc_card_set_dead(card
);
903 card
->raw_scr
[0] = ntohl(card
->raw_scr
[0]);
904 card
->raw_scr
[1] = ntohl(card
->raw_scr
[1]);
906 mmc_decode_scr(card
);
909 mmc_deselect_cards(host
);
912 static unsigned int mmc_calculate_clock(struct mmc_host
*host
)
914 struct mmc_card
*card
;
915 unsigned int max_dtr
= host
->f_max
;
917 list_for_each_entry(card
, &host
->cards
, node
)
918 if (!mmc_card_dead(card
) && max_dtr
> card
->csd
.max_dtr
)
919 max_dtr
= card
->csd
.max_dtr
;
921 DBG("MMC: selected %d.%03dMHz transfer rate\n",
922 max_dtr
/ 1000000, (max_dtr
/ 1000) % 1000);
928 * Check whether cards we already know about are still present.
929 * We do this by requesting status, and checking whether a card
932 * A request for status does not cause a state change in data
935 static void mmc_check_cards(struct mmc_host
*host
)
937 struct list_head
*l
, *n
;
939 mmc_deselect_cards(host
);
941 list_for_each_safe(l
, n
, &host
->cards
) {
942 struct mmc_card
*card
= mmc_list_to_card(l
);
943 struct mmc_command cmd
;
946 cmd
.opcode
= MMC_SEND_STATUS
;
947 cmd
.arg
= card
->rca
<< 16;
948 cmd
.flags
= MMC_RSP_R1
;
950 err
= mmc_wait_for_cmd(host
, &cmd
, CMD_RETRIES
);
951 if (err
== MMC_ERR_NONE
)
954 mmc_card_set_dead(card
);
958 static void mmc_setup(struct mmc_host
*host
)
960 if (host
->ios
.power_mode
!= MMC_POWER_ON
) {
964 host
->mode
= MMC_MODE_SD
;
967 mmc_idle_cards(host
);
969 err
= mmc_send_app_op_cond(host
, 0, &ocr
);
972 * If we fail to detect any SD cards then try
973 * searching for MMC cards.
975 if (err
!= MMC_ERR_NONE
) {
976 host
->mode
= MMC_MODE_MMC
;
978 err
= mmc_send_op_cond(host
, 0, &ocr
);
979 if (err
!= MMC_ERR_NONE
)
983 host
->ocr
= mmc_select_voltage(host
, ocr
);
986 * Since we're changing the OCR value, we seem to
987 * need to tell some cards to go back to the idle
988 * state. We wait 1ms to give cards time to
992 mmc_idle_cards(host
);
994 host
->ios
.bus_mode
= MMC_BUSMODE_OPENDRAIN
;
995 host
->ios
.clock
= host
->f_min
;
996 host
->ops
->set_ios(host
, &host
->ios
);
999 * We should remember the OCR mask from the existing
1000 * cards, and detect the new cards OCR mask, combine
1001 * the two and re-select the VDD. However, if we do
1002 * change VDD, we should do an idle, and then do a
1003 * full re-initialisation. We would need to notify
1004 * drivers so that they can re-setup the cards as
1005 * well, while keeping their queues at bay.
1007 * For the moment, we take the easy way out - if the
1008 * new cards don't like our currently selected VDD,
1009 * they drop off the bus.
1017 * Send the selected OCR multiple times... until the cards
1018 * all get the idea that they should be ready for CMD2.
1019 * (My SanDisk card seems to need this.)
1021 if (host
->mode
== MMC_MODE_SD
)
1022 mmc_send_app_op_cond(host
, host
->ocr
, NULL
);
1024 mmc_send_op_cond(host
, host
->ocr
, NULL
);
1026 mmc_discover_cards(host
);
1029 * Ok, now switch to push-pull mode.
1031 host
->ios
.bus_mode
= MMC_BUSMODE_PUSHPULL
;
1032 host
->ops
->set_ios(host
, &host
->ios
);
1034 mmc_read_csds(host
);
1036 if (host
->mode
== MMC_MODE_SD
)
1037 mmc_read_scrs(host
);
1042 * mmc_detect_change - process change of state on a MMC socket
1043 * @host: host which changed state.
1045 * All we know is that card(s) have been inserted or removed
1046 * from the socket(s). We don't know which socket or cards.
1048 void mmc_detect_change(struct mmc_host
*host
)
1050 schedule_work(&host
->detect
);
1053 EXPORT_SYMBOL(mmc_detect_change
);
1056 static void mmc_rescan(void *data
)
1058 struct mmc_host
*host
= data
;
1059 struct list_head
*l
, *n
;
1061 mmc_claim_host(host
);
1063 if (host
->ios
.power_mode
== MMC_POWER_ON
)
1064 mmc_check_cards(host
);
1068 if (!list_empty(&host
->cards
)) {
1070 * (Re-)calculate the fastest clock rate which the
1071 * attached cards and the host support.
1073 host
->ios
.clock
= mmc_calculate_clock(host
);
1074 host
->ops
->set_ios(host
, &host
->ios
);
1077 mmc_release_host(host
);
1079 list_for_each_safe(l
, n
, &host
->cards
) {
1080 struct mmc_card
*card
= mmc_list_to_card(l
);
1083 * If this is a new and good card, register it.
1085 if (!mmc_card_present(card
) && !mmc_card_dead(card
)) {
1086 if (mmc_register_card(card
))
1087 mmc_card_set_dead(card
);
1089 mmc_card_set_present(card
);
1093 * If this card is dead, destroy it.
1095 if (mmc_card_dead(card
)) {
1096 list_del(&card
->node
);
1097 mmc_remove_card(card
);
1102 * If we discover that there are no cards on the
1103 * bus, turn off the clock and power down.
1105 if (list_empty(&host
->cards
))
1106 mmc_power_off(host
);
1111 * mmc_alloc_host - initialise the per-host structure.
1112 * @extra: sizeof private data structure
1113 * @dev: pointer to host device model structure
1115 * Initialise the per-host structure.
1117 struct mmc_host
*mmc_alloc_host(int extra
, struct device
*dev
)
1119 struct mmc_host
*host
;
1121 host
= mmc_alloc_host_sysfs(extra
, dev
);
1123 spin_lock_init(&host
->lock
);
1124 init_waitqueue_head(&host
->wq
);
1125 INIT_LIST_HEAD(&host
->cards
);
1126 INIT_WORK(&host
->detect
, mmc_rescan
, host
);
1129 * By default, hosts do not support SGIO or large requests.
1130 * They have to set these according to their abilities.
1132 host
->max_hw_segs
= 1;
1133 host
->max_phys_segs
= 1;
1134 host
->max_sectors
= 1 << (PAGE_CACHE_SHIFT
- 9);
1135 host
->max_seg_size
= PAGE_CACHE_SIZE
;
1141 EXPORT_SYMBOL(mmc_alloc_host
);
1144 * mmc_add_host - initialise host hardware
1147 int mmc_add_host(struct mmc_host
*host
)
1151 ret
= mmc_add_host_sysfs(host
);
1153 mmc_power_off(host
);
1154 mmc_detect_change(host
);
1160 EXPORT_SYMBOL(mmc_add_host
);
1163 * mmc_remove_host - remove host hardware
1166 * Unregister and remove all cards associated with this host,
1167 * and power down the MMC bus.
1169 void mmc_remove_host(struct mmc_host
*host
)
1171 struct list_head
*l
, *n
;
1173 list_for_each_safe(l
, n
, &host
->cards
) {
1174 struct mmc_card
*card
= mmc_list_to_card(l
);
1176 mmc_remove_card(card
);
1179 mmc_power_off(host
);
1180 mmc_remove_host_sysfs(host
);
1183 EXPORT_SYMBOL(mmc_remove_host
);
1186 * mmc_free_host - free the host structure
1189 * Free the host once all references to it have been dropped.
1191 void mmc_free_host(struct mmc_host
*host
)
1193 flush_scheduled_work();
1194 mmc_free_host_sysfs(host
);
1197 EXPORT_SYMBOL(mmc_free_host
);
1202 * mmc_suspend_host - suspend a host
1204 * @state: suspend mode (PM_SUSPEND_xxx)
1206 int mmc_suspend_host(struct mmc_host
*host
, pm_message_t state
)
1208 mmc_claim_host(host
);
1209 mmc_deselect_cards(host
);
1210 mmc_power_off(host
);
1211 mmc_release_host(host
);
1216 EXPORT_SYMBOL(mmc_suspend_host
);
1219 * mmc_resume_host - resume a previously suspended host
1222 int mmc_resume_host(struct mmc_host
*host
)
1224 mmc_detect_change(host
);
1229 EXPORT_SYMBOL(mmc_resume_host
);
1233 MODULE_LICENSE("GPL");