2 * linux/drivers/mmc/core/mmc.c
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
6 * MMCv4 support Copyright (C) 2006 Philip Langdale, 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.
13 #include <linux/err.h>
14 #include <linux/slab.h>
16 #include <linux/mmc/host.h>
17 #include <linux/mmc/card.h>
18 #include <linux/mmc/mmc.h>
24 static const unsigned int tran_exp
[] = {
25 10000, 100000, 1000000, 10000000,
29 static const unsigned char tran_mant
[] = {
30 0, 10, 12, 13, 15, 20, 25, 30,
31 35, 40, 45, 50, 55, 60, 70, 80,
34 static const unsigned int tacc_exp
[] = {
35 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
38 static const unsigned int tacc_mant
[] = {
39 0, 10, 12, 13, 15, 20, 25, 30,
40 35, 40, 45, 50, 55, 60, 70, 80,
43 #define UNSTUFF_BITS(resp,start,size) \
45 const int __size = size; \
46 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
47 const int __off = 3 - ((start) / 32); \
48 const int __shft = (start) & 31; \
51 __res = resp[__off] >> __shft; \
52 if (__size + __shft > 32) \
53 __res |= resp[__off-1] << ((32 - __shft) % 32); \
58 * Given the decoded CSD structure, decode the raw CID to our CID structure.
60 static int mmc_decode_cid(struct mmc_card
*card
)
62 u32
*resp
= card
->raw_cid
;
65 * The selection of the format here is based upon published
66 * specs from sandisk and from what people have reported.
68 switch (card
->csd
.mmca_vsn
) {
69 case 0: /* MMC v1.0 - v1.2 */
70 case 1: /* MMC v1.4 */
71 card
->cid
.manfid
= UNSTUFF_BITS(resp
, 104, 24);
72 card
->cid
.prod_name
[0] = UNSTUFF_BITS(resp
, 96, 8);
73 card
->cid
.prod_name
[1] = UNSTUFF_BITS(resp
, 88, 8);
74 card
->cid
.prod_name
[2] = UNSTUFF_BITS(resp
, 80, 8);
75 card
->cid
.prod_name
[3] = UNSTUFF_BITS(resp
, 72, 8);
76 card
->cid
.prod_name
[4] = UNSTUFF_BITS(resp
, 64, 8);
77 card
->cid
.prod_name
[5] = UNSTUFF_BITS(resp
, 56, 8);
78 card
->cid
.prod_name
[6] = UNSTUFF_BITS(resp
, 48, 8);
79 card
->cid
.hwrev
= UNSTUFF_BITS(resp
, 44, 4);
80 card
->cid
.fwrev
= UNSTUFF_BITS(resp
, 40, 4);
81 card
->cid
.serial
= UNSTUFF_BITS(resp
, 16, 24);
82 card
->cid
.month
= UNSTUFF_BITS(resp
, 12, 4);
83 card
->cid
.year
= UNSTUFF_BITS(resp
, 8, 4) + 1997;
86 case 2: /* MMC v2.0 - v2.2 */
87 case 3: /* MMC v3.1 - v3.3 */
89 card
->cid
.manfid
= UNSTUFF_BITS(resp
, 120, 8);
90 card
->cid
.oemid
= UNSTUFF_BITS(resp
, 104, 16);
91 card
->cid
.prod_name
[0] = UNSTUFF_BITS(resp
, 96, 8);
92 card
->cid
.prod_name
[1] = UNSTUFF_BITS(resp
, 88, 8);
93 card
->cid
.prod_name
[2] = UNSTUFF_BITS(resp
, 80, 8);
94 card
->cid
.prod_name
[3] = UNSTUFF_BITS(resp
, 72, 8);
95 card
->cid
.prod_name
[4] = UNSTUFF_BITS(resp
, 64, 8);
96 card
->cid
.prod_name
[5] = UNSTUFF_BITS(resp
, 56, 8);
97 card
->cid
.serial
= UNSTUFF_BITS(resp
, 16, 32);
98 card
->cid
.month
= UNSTUFF_BITS(resp
, 12, 4);
99 card
->cid
.year
= UNSTUFF_BITS(resp
, 8, 4) + 1997;
103 printk(KERN_ERR
"%s: card has unknown MMCA version %d\n",
104 mmc_hostname(card
->host
), card
->csd
.mmca_vsn
);
111 static void mmc_set_erase_size(struct mmc_card
*card
)
113 if (card
->ext_csd
.erase_group_def
& 1)
114 card
->erase_size
= card
->ext_csd
.hc_erase_size
;
116 card
->erase_size
= card
->csd
.erase_size
;
118 mmc_init_erase(card
);
122 * Given a 128-bit response, decode to our card CSD structure.
124 static int mmc_decode_csd(struct mmc_card
*card
)
126 struct mmc_csd
*csd
= &card
->csd
;
127 unsigned int e
, m
, a
, b
;
128 u32
*resp
= card
->raw_csd
;
131 * We only understand CSD structure v1.1 and v1.2.
132 * v1.2 has extra information in bits 15, 11 and 10.
133 * We also support eMMC v4.4 & v4.41.
135 csd
->structure
= UNSTUFF_BITS(resp
, 126, 2);
136 if (csd
->structure
== 0) {
137 printk(KERN_ERR
"%s: unrecognised CSD structure version %d\n",
138 mmc_hostname(card
->host
), csd
->structure
);
142 csd
->mmca_vsn
= UNSTUFF_BITS(resp
, 122, 4);
143 m
= UNSTUFF_BITS(resp
, 115, 4);
144 e
= UNSTUFF_BITS(resp
, 112, 3);
145 csd
->tacc_ns
= (tacc_exp
[e
] * tacc_mant
[m
] + 9) / 10;
146 csd
->tacc_clks
= UNSTUFF_BITS(resp
, 104, 8) * 100;
148 m
= UNSTUFF_BITS(resp
, 99, 4);
149 e
= UNSTUFF_BITS(resp
, 96, 3);
150 csd
->max_dtr
= tran_exp
[e
] * tran_mant
[m
];
151 csd
->cmdclass
= UNSTUFF_BITS(resp
, 84, 12);
153 e
= UNSTUFF_BITS(resp
, 47, 3);
154 m
= UNSTUFF_BITS(resp
, 62, 12);
155 csd
->capacity
= (1 + m
) << (e
+ 2);
157 csd
->read_blkbits
= UNSTUFF_BITS(resp
, 80, 4);
158 csd
->read_partial
= UNSTUFF_BITS(resp
, 79, 1);
159 csd
->write_misalign
= UNSTUFF_BITS(resp
, 78, 1);
160 csd
->read_misalign
= UNSTUFF_BITS(resp
, 77, 1);
161 csd
->r2w_factor
= UNSTUFF_BITS(resp
, 26, 3);
162 csd
->write_blkbits
= UNSTUFF_BITS(resp
, 22, 4);
163 csd
->write_partial
= UNSTUFF_BITS(resp
, 21, 1);
165 if (csd
->write_blkbits
>= 9) {
166 a
= UNSTUFF_BITS(resp
, 42, 5);
167 b
= UNSTUFF_BITS(resp
, 37, 5);
168 csd
->erase_size
= (a
+ 1) * (b
+ 1);
169 csd
->erase_size
<<= csd
->write_blkbits
- 9;
176 * Read and decode extended CSD.
178 static int mmc_read_ext_csd(struct mmc_card
*card
)
185 if (card
->csd
.mmca_vsn
< CSD_SPEC_VER_4
)
189 * As the ext_csd is so large and mostly unused, we don't store the
190 * raw block in mmc_card.
192 ext_csd
= kmalloc(512, GFP_KERNEL
);
194 printk(KERN_ERR
"%s: could not allocate a buffer to "
195 "receive the ext_csd.\n", mmc_hostname(card
->host
));
199 err
= mmc_send_ext_csd(card
, ext_csd
);
201 /* If the host or the card can't do the switch,
202 * fail more gracefully. */
209 * High capacity cards should have this "magic" size
210 * stored in their CSD.
212 if (card
->csd
.capacity
== (4096 * 512)) {
213 printk(KERN_ERR
"%s: unable to read EXT_CSD "
214 "on a possible high capacity card. "
215 "Card will be ignored.\n",
216 mmc_hostname(card
->host
));
218 printk(KERN_WARNING
"%s: unable to read "
219 "EXT_CSD, performance might "
221 mmc_hostname(card
->host
));
228 /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
229 if (card
->csd
.structure
== 3) {
230 int ext_csd_struct
= ext_csd
[EXT_CSD_STRUCTURE
];
231 if (ext_csd_struct
> 2) {
232 printk(KERN_ERR
"%s: unrecognised EXT_CSD structure "
233 "version %d\n", mmc_hostname(card
->host
),
240 card
->ext_csd
.rev
= ext_csd
[EXT_CSD_REV
];
241 if (card
->ext_csd
.rev
> 5) {
242 printk(KERN_ERR
"%s: unrecognised EXT_CSD revision %d\n",
243 mmc_hostname(card
->host
), card
->ext_csd
.rev
);
248 if (card
->ext_csd
.rev
>= 2) {
249 card
->ext_csd
.sectors
=
250 ext_csd
[EXT_CSD_SEC_CNT
+ 0] << 0 |
251 ext_csd
[EXT_CSD_SEC_CNT
+ 1] << 8 |
252 ext_csd
[EXT_CSD_SEC_CNT
+ 2] << 16 |
253 ext_csd
[EXT_CSD_SEC_CNT
+ 3] << 24;
255 /* Cards with density > 2GiB are sector addressed */
256 if (card
->ext_csd
.sectors
> (2u * 1024 * 1024 * 1024) / 512)
257 mmc_card_set_blockaddr(card
);
260 switch (ext_csd
[EXT_CSD_CARD_TYPE
] & EXT_CSD_CARD_TYPE_MASK
) {
261 case EXT_CSD_CARD_TYPE_DDR_52
| EXT_CSD_CARD_TYPE_52
|
262 EXT_CSD_CARD_TYPE_26
:
263 card
->ext_csd
.hs_max_dtr
= 52000000;
264 card
->ext_csd
.card_type
= EXT_CSD_CARD_TYPE_DDR_52
;
266 case EXT_CSD_CARD_TYPE_DDR_1_2V
| EXT_CSD_CARD_TYPE_52
|
267 EXT_CSD_CARD_TYPE_26
:
268 card
->ext_csd
.hs_max_dtr
= 52000000;
269 card
->ext_csd
.card_type
= EXT_CSD_CARD_TYPE_DDR_1_2V
;
271 case EXT_CSD_CARD_TYPE_DDR_1_8V
| EXT_CSD_CARD_TYPE_52
|
272 EXT_CSD_CARD_TYPE_26
:
273 card
->ext_csd
.hs_max_dtr
= 52000000;
274 card
->ext_csd
.card_type
= EXT_CSD_CARD_TYPE_DDR_1_8V
;
276 case EXT_CSD_CARD_TYPE_52
| EXT_CSD_CARD_TYPE_26
:
277 card
->ext_csd
.hs_max_dtr
= 52000000;
279 case EXT_CSD_CARD_TYPE_26
:
280 card
->ext_csd
.hs_max_dtr
= 26000000;
283 /* MMC v4 spec says this cannot happen */
284 printk(KERN_WARNING
"%s: card is mmc v4 but doesn't "
285 "support any high-speed modes.\n",
286 mmc_hostname(card
->host
));
289 if (card
->ext_csd
.rev
>= 3) {
290 u8 sa_shift
= ext_csd
[EXT_CSD_S_A_TIMEOUT
];
292 /* Sleep / awake timeout in 100ns units */
293 if (sa_shift
> 0 && sa_shift
<= 0x17)
294 card
->ext_csd
.sa_timeout
=
295 1 << ext_csd
[EXT_CSD_S_A_TIMEOUT
];
296 card
->ext_csd
.erase_group_def
=
297 ext_csd
[EXT_CSD_ERASE_GROUP_DEF
];
298 card
->ext_csd
.hc_erase_timeout
= 300 *
299 ext_csd
[EXT_CSD_ERASE_TIMEOUT_MULT
];
300 card
->ext_csd
.hc_erase_size
=
301 ext_csd
[EXT_CSD_HC_ERASE_GRP_SIZE
] << 10;
304 if (card
->ext_csd
.rev
>= 4) {
306 * Enhanced area feature support -- check whether the eMMC
307 * card has the Enhanced area enabled. If so, export enhanced
308 * area offset and size to user by adding sysfs interface.
310 if ((ext_csd
[EXT_CSD_PARTITION_SUPPORT
] & 0x2) &&
311 (ext_csd
[EXT_CSD_PARTITION_ATTRIBUTE
] & 0x1)) {
313 ext_csd
[EXT_CSD_HC_ERASE_GRP_SIZE
];
315 ext_csd
[EXT_CSD_HC_WP_GRP_SIZE
];
317 card
->ext_csd
.enhanced_area_en
= 1;
319 * calculate the enhanced data area offset, in bytes
321 card
->ext_csd
.enhanced_area_offset
=
322 (ext_csd
[139] << 24) + (ext_csd
[138] << 16) +
323 (ext_csd
[137] << 8) + ext_csd
[136];
324 if (mmc_card_blockaddr(card
))
325 card
->ext_csd
.enhanced_area_offset
<<= 9;
327 * calculate the enhanced data area size, in kilobytes
329 card
->ext_csd
.enhanced_area_size
=
330 (ext_csd
[142] << 16) + (ext_csd
[141] << 8) +
332 card
->ext_csd
.enhanced_area_size
*=
333 (size_t)(hc_erase_grp_sz
* hc_wp_grp_sz
);
334 card
->ext_csd
.enhanced_area_size
<<= 9;
337 * If the enhanced area is not enabled, disable these
340 card
->ext_csd
.enhanced_area_offset
= -EINVAL
;
341 card
->ext_csd
.enhanced_area_size
= -EINVAL
;
343 card
->ext_csd
.sec_trim_mult
=
344 ext_csd
[EXT_CSD_SEC_TRIM_MULT
];
345 card
->ext_csd
.sec_erase_mult
=
346 ext_csd
[EXT_CSD_SEC_ERASE_MULT
];
347 card
->ext_csd
.sec_feature_support
=
348 ext_csd
[EXT_CSD_SEC_FEATURE_SUPPORT
];
349 card
->ext_csd
.trim_timeout
= 300 *
350 ext_csd
[EXT_CSD_TRIM_MULT
];
353 if (ext_csd
[EXT_CSD_ERASED_MEM_CONT
])
354 card
->erased_byte
= 0xFF;
356 card
->erased_byte
= 0x0;
364 MMC_DEV_ATTR(cid
, "%08x%08x%08x%08x\n", card
->raw_cid
[0], card
->raw_cid
[1],
365 card
->raw_cid
[2], card
->raw_cid
[3]);
366 MMC_DEV_ATTR(csd
, "%08x%08x%08x%08x\n", card
->raw_csd
[0], card
->raw_csd
[1],
367 card
->raw_csd
[2], card
->raw_csd
[3]);
368 MMC_DEV_ATTR(date
, "%02d/%04d\n", card
->cid
.month
, card
->cid
.year
);
369 MMC_DEV_ATTR(erase_size
, "%u\n", card
->erase_size
<< 9);
370 MMC_DEV_ATTR(preferred_erase_size
, "%u\n", card
->pref_erase
<< 9);
371 MMC_DEV_ATTR(fwrev
, "0x%x\n", card
->cid
.fwrev
);
372 MMC_DEV_ATTR(hwrev
, "0x%x\n", card
->cid
.hwrev
);
373 MMC_DEV_ATTR(manfid
, "0x%06x\n", card
->cid
.manfid
);
374 MMC_DEV_ATTR(name
, "%s\n", card
->cid
.prod_name
);
375 MMC_DEV_ATTR(oemid
, "0x%04x\n", card
->cid
.oemid
);
376 MMC_DEV_ATTR(serial
, "0x%08x\n", card
->cid
.serial
);
377 MMC_DEV_ATTR(enhanced_area_offset
, "%llu\n",
378 card
->ext_csd
.enhanced_area_offset
);
379 MMC_DEV_ATTR(enhanced_area_size
, "%u\n", card
->ext_csd
.enhanced_area_size
);
381 static struct attribute
*mmc_std_attrs
[] = {
385 &dev_attr_erase_size
.attr
,
386 &dev_attr_preferred_erase_size
.attr
,
387 &dev_attr_fwrev
.attr
,
388 &dev_attr_hwrev
.attr
,
389 &dev_attr_manfid
.attr
,
391 &dev_attr_oemid
.attr
,
392 &dev_attr_serial
.attr
,
393 &dev_attr_enhanced_area_offset
.attr
,
394 &dev_attr_enhanced_area_size
.attr
,
398 static struct attribute_group mmc_std_attr_group
= {
399 .attrs
= mmc_std_attrs
,
402 static const struct attribute_group
*mmc_attr_groups
[] = {
407 static struct device_type mmc_type
= {
408 .groups
= mmc_attr_groups
,
412 * Handle the detection and initialisation of a card.
414 * In the case of a resume, "oldcard" will contain the card
415 * we're trying to reinitialise.
417 static int mmc_init_card(struct mmc_host
*host
, u32 ocr
,
418 struct mmc_card
*oldcard
)
420 struct mmc_card
*card
;
423 unsigned int max_dtr
;
427 WARN_ON(!host
->claimed
);
430 * Since we're changing the OCR value, we seem to
431 * need to tell some cards to go back to the idle
432 * state. We wait 1ms to give cards time to
437 /* The extra bit indicates that we support high capacity */
438 err
= mmc_send_op_cond(host
, ocr
| (1 << 30), &rocr
);
443 * For SPI, enable CRC as appropriate.
445 if (mmc_host_is_spi(host
)) {
446 err
= mmc_spi_set_crc(host
, use_spi_crc
);
452 * Fetch CID from card.
454 if (mmc_host_is_spi(host
))
455 err
= mmc_send_cid(host
, cid
);
457 err
= mmc_all_send_cid(host
, cid
);
462 if (memcmp(cid
, oldcard
->raw_cid
, sizeof(cid
)) != 0) {
470 * Allocate card structure.
472 card
= mmc_alloc_card(host
, &mmc_type
);
478 card
->type
= MMC_TYPE_MMC
;
480 memcpy(card
->raw_cid
, cid
, sizeof(card
->raw_cid
));
484 * For native busses: set card RCA and quit open drain mode.
486 if (!mmc_host_is_spi(host
)) {
487 err
= mmc_set_relative_addr(card
);
491 mmc_set_bus_mode(host
, MMC_BUSMODE_PUSHPULL
);
496 * Fetch CSD from card.
498 err
= mmc_send_csd(card
, card
->raw_csd
);
502 err
= mmc_decode_csd(card
);
505 err
= mmc_decode_cid(card
);
511 * Select card, as all following commands rely on that.
513 if (!mmc_host_is_spi(host
)) {
514 err
= mmc_select_card(card
);
521 * Fetch and process extended CSD.
523 err
= mmc_read_ext_csd(card
);
527 /* If doing byte addressing, check if required to do sector
528 * addressing. Handle the case of <2GB cards needing sector
529 * addressing. See section 8.1 JEDEC Standard JED84-A441;
530 * ocr register has bit 30 set for sector addressing.
532 if (!(mmc_card_blockaddr(card
)) && (rocr
& (1<<30)))
533 mmc_card_set_blockaddr(card
);
535 /* Erase size depends on CSD and Extended CSD */
536 mmc_set_erase_size(card
);
540 * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
541 * bit. This bit will be lost every time after a reset or power off.
543 if (card
->ext_csd
.enhanced_area_en
) {
544 err
= mmc_switch(card
, EXT_CSD_CMD_SET_NORMAL
,
545 EXT_CSD_ERASE_GROUP_DEF
, 1);
547 if (err
&& err
!= -EBADMSG
)
553 * Just disable enhanced area off & sz
554 * will try to enable ERASE_GROUP_DEF
555 * during next time reinit
557 card
->ext_csd
.enhanced_area_offset
= -EINVAL
;
558 card
->ext_csd
.enhanced_area_size
= -EINVAL
;
560 card
->ext_csd
.erase_group_def
= 1;
562 * enable ERASE_GRP_DEF successfully.
563 * This will affect the erase size, so
564 * here need to reset erase size
566 mmc_set_erase_size(card
);
571 * Activate high speed (if supported)
573 if ((card
->ext_csd
.hs_max_dtr
!= 0) &&
574 (host
->caps
& MMC_CAP_MMC_HIGHSPEED
)) {
575 err
= mmc_switch(card
, EXT_CSD_CMD_SET_NORMAL
,
576 EXT_CSD_HS_TIMING
, 1);
577 if (err
&& err
!= -EBADMSG
)
581 printk(KERN_WARNING
"%s: switch to highspeed failed\n",
582 mmc_hostname(card
->host
));
585 mmc_card_set_highspeed(card
);
586 mmc_set_timing(card
->host
, MMC_TIMING_MMC_HS
);
593 max_dtr
= (unsigned int)-1;
595 if (mmc_card_highspeed(card
)) {
596 if (max_dtr
> card
->ext_csd
.hs_max_dtr
)
597 max_dtr
= card
->ext_csd
.hs_max_dtr
;
598 } else if (max_dtr
> card
->csd
.max_dtr
) {
599 max_dtr
= card
->csd
.max_dtr
;
602 mmc_set_clock(host
, max_dtr
);
605 * Indicate DDR mode (if supported).
607 if (mmc_card_highspeed(card
)) {
608 if ((card
->ext_csd
.card_type
& EXT_CSD_CARD_TYPE_DDR_1_8V
)
609 && (host
->caps
& (MMC_CAP_1_8V_DDR
)))
610 ddr
= MMC_1_8V_DDR_MODE
;
611 else if ((card
->ext_csd
.card_type
& EXT_CSD_CARD_TYPE_DDR_1_2V
)
612 && (host
->caps
& (MMC_CAP_1_2V_DDR
)))
613 ddr
= MMC_1_2V_DDR_MODE
;
617 * Activate wide bus and DDR (if supported).
619 if ((card
->csd
.mmca_vsn
>= CSD_SPEC_VER_4
) &&
620 (host
->caps
& (MMC_CAP_4_BIT_DATA
| MMC_CAP_8_BIT_DATA
))) {
621 static unsigned ext_csd_bits
[][2] = {
622 { EXT_CSD_BUS_WIDTH_8
, EXT_CSD_DDR_BUS_WIDTH_8
},
623 { EXT_CSD_BUS_WIDTH_4
, EXT_CSD_DDR_BUS_WIDTH_4
},
624 { EXT_CSD_BUS_WIDTH_1
, EXT_CSD_BUS_WIDTH_1
},
626 static unsigned bus_widths
[] = {
631 unsigned idx
, bus_width
= 0;
633 if (host
->caps
& MMC_CAP_8_BIT_DATA
)
637 for (; idx
< ARRAY_SIZE(bus_widths
); idx
++) {
638 bus_width
= bus_widths
[idx
];
639 if (bus_width
== MMC_BUS_WIDTH_1
)
640 ddr
= 0; /* no DDR for 1-bit width */
641 err
= mmc_switch(card
, EXT_CSD_CMD_SET_NORMAL
,
643 ext_csd_bits
[idx
][0]);
645 mmc_set_bus_width_ddr(card
->host
,
646 bus_width
, MMC_SDR_MODE
);
648 * If controller can't handle bus width test,
649 * use the highest bus width to maintain
650 * compatibility with previous MMC behavior.
652 if (!(host
->caps
& MMC_CAP_BUS_WIDTH_TEST
))
654 err
= mmc_bus_test(card
, bus_width
);
661 err
= mmc_switch(card
, EXT_CSD_CMD_SET_NORMAL
,
663 ext_csd_bits
[idx
][1]);
666 printk(KERN_WARNING
"%s: switch to bus width %d ddr %d "
667 "failed\n", mmc_hostname(card
->host
),
668 1 << bus_width
, ddr
);
671 mmc_card_set_ddr_mode(card
);
672 mmc_set_bus_width_ddr(card
->host
, bus_width
, ddr
);
683 mmc_remove_card(card
);
690 * Host is being removed. Free up the current card.
692 static void mmc_remove(struct mmc_host
*host
)
697 mmc_remove_card(host
->card
);
702 * Card detection callback from host.
704 static void mmc_detect(struct mmc_host
*host
)
711 mmc_claim_host(host
);
714 * Just check if our card has been removed.
716 err
= mmc_send_status(host
->card
, NULL
);
718 mmc_release_host(host
);
723 mmc_claim_host(host
);
724 mmc_detach_bus(host
);
725 mmc_release_host(host
);
730 * Suspend callback from host.
732 static int mmc_suspend(struct mmc_host
*host
)
737 mmc_claim_host(host
);
738 if (!mmc_host_is_spi(host
))
739 mmc_deselect_cards(host
);
740 host
->card
->state
&= ~MMC_STATE_HIGHSPEED
;
741 mmc_release_host(host
);
747 * Resume callback from host.
749 * This function tries to determine if the same card is still present
750 * and, if so, restore all state to it.
752 static int mmc_resume(struct mmc_host
*host
)
759 mmc_claim_host(host
);
760 err
= mmc_init_card(host
, host
->ocr
, host
->card
);
761 mmc_release_host(host
);
766 static int mmc_power_restore(struct mmc_host
*host
)
770 host
->card
->state
&= ~MMC_STATE_HIGHSPEED
;
771 mmc_claim_host(host
);
772 ret
= mmc_init_card(host
, host
->ocr
, host
->card
);
773 mmc_release_host(host
);
778 static int mmc_sleep(struct mmc_host
*host
)
780 struct mmc_card
*card
= host
->card
;
783 if (card
&& card
->ext_csd
.rev
>= 3) {
784 err
= mmc_card_sleepawake(host
, 1);
786 pr_debug("%s: Error %d while putting card into sleep",
787 mmc_hostname(host
), err
);
793 static int mmc_awake(struct mmc_host
*host
)
795 struct mmc_card
*card
= host
->card
;
798 if (card
&& card
->ext_csd
.rev
>= 3) {
799 err
= mmc_card_sleepawake(host
, 0);
801 pr_debug("%s: Error %d while awaking sleeping card",
802 mmc_hostname(host
), err
);
808 static const struct mmc_bus_ops mmc_ops
= {
811 .remove
= mmc_remove
,
812 .detect
= mmc_detect
,
815 .power_restore
= mmc_power_restore
,
818 static const struct mmc_bus_ops mmc_ops_unsafe
= {
821 .remove
= mmc_remove
,
822 .detect
= mmc_detect
,
823 .suspend
= mmc_suspend
,
824 .resume
= mmc_resume
,
825 .power_restore
= mmc_power_restore
,
828 static void mmc_attach_bus_ops(struct mmc_host
*host
)
830 const struct mmc_bus_ops
*bus_ops
;
832 if (!mmc_card_is_removable(host
))
833 bus_ops
= &mmc_ops_unsafe
;
836 mmc_attach_bus(host
, bus_ops
);
840 * Starting point for MMC card init.
842 int mmc_attach_mmc(struct mmc_host
*host
)
848 WARN_ON(!host
->claimed
);
850 err
= mmc_send_op_cond(host
, 0, &ocr
);
854 mmc_attach_bus_ops(host
);
855 if (host
->ocr_avail_mmc
)
856 host
->ocr_avail
= host
->ocr_avail_mmc
;
859 * We need to get OCR a different way for SPI.
861 if (mmc_host_is_spi(host
)) {
862 err
= mmc_spi_read_ocr(host
, 1, &ocr
);
868 * Sanity check the voltages that the card claims to
872 printk(KERN_WARNING
"%s: card claims to support voltages "
873 "below the defined range. These will be ignored.\n",
878 host
->ocr
= mmc_select_voltage(host
, ocr
);
881 * Can we support the voltage of the card?
889 * Detect and init the card.
891 err
= mmc_init_card(host
, host
->ocr
, NULL
);
895 mmc_release_host(host
);
896 err
= mmc_add_card(host
->card
);
897 mmc_claim_host(host
);
904 mmc_release_host(host
);
905 mmc_remove_card(host
->card
);
906 mmc_claim_host(host
);
909 mmc_detach_bus(host
);
911 printk(KERN_ERR
"%s: error %d whilst initialising MMC card\n",
912 mmc_hostname(host
), err
);