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1/*
2 * linux/include/linux/mmc/card.h
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * Card driver specific definitions.
9 */
10#ifndef LINUX_MMC_CARD_H
11#define LINUX_MMC_CARD_H
12
13#include <linux/device.h>
14#include <linux/mmc/core.h>
15#include <linux/mod_devicetable.h>
16
17struct mmc_cid {
18 unsigned int manfid;
19 char prod_name[8];
20 unsigned char prv;
21 unsigned int serial;
22 unsigned short oemid;
23 unsigned short year;
24 unsigned char hwrev;
25 unsigned char fwrev;
26 unsigned char month;
27};
28
29struct mmc_csd {
30 unsigned char structure;
31 unsigned char mmca_vsn;
32 unsigned short cmdclass;
33 unsigned short tacc_clks;
34 unsigned int tacc_ns;
35 unsigned int c_size;
36 unsigned int r2w_factor;
37 unsigned int max_dtr;
38 unsigned int erase_size; /* In sectors */
39 unsigned int read_blkbits;
40 unsigned int write_blkbits;
41 unsigned int capacity;
42 unsigned int read_partial:1,
43 read_misalign:1,
44 write_partial:1,
45 write_misalign:1,
46 dsr_imp:1;
47};
48
49struct mmc_ext_csd {
50 u8 rev;
51 u8 erase_group_def;
52 u8 sec_feature_support;
53 u8 rel_sectors;
54 u8 rel_param;
55 u8 part_config;
56 u8 cache_ctrl;
57 u8 rst_n_function;
58 u8 max_packed_writes;
59 u8 max_packed_reads;
60 u8 packed_event_en;
61 unsigned int part_time; /* Units: ms */
62 unsigned int sa_timeout; /* Units: 100ns */
63 unsigned int generic_cmd6_time; /* Units: 10ms */
64 unsigned int power_off_longtime; /* Units: ms */
65 u8 power_off_notification; /* state */
66 unsigned int hs_max_dtr;
67 unsigned int hs200_max_dtr;
68#define MMC_HIGH_26_MAX_DTR 26000000
69#define MMC_HIGH_52_MAX_DTR 52000000
70#define MMC_HIGH_DDR_MAX_DTR 52000000
71#define MMC_HS200_MAX_DTR 200000000
72 unsigned int sectors;
73 unsigned int hc_erase_size; /* In sectors */
74 unsigned int hc_erase_timeout; /* In milliseconds */
75 unsigned int sec_trim_mult; /* Secure trim multiplier */
76 unsigned int sec_erase_mult; /* Secure erase multiplier */
77 unsigned int trim_timeout; /* In milliseconds */
78 bool partition_setting_completed; /* enable bit */
79 unsigned long long enhanced_area_offset; /* Units: Byte */
80 unsigned int enhanced_area_size; /* Units: KB */
81 unsigned int cache_size; /* Units: KB */
82 bool hpi_en; /* HPI enablebit */
83 bool hpi; /* HPI support bit */
84 unsigned int hpi_cmd; /* cmd used as HPI */
85 bool bkops; /* background support bit */
86 bool man_bkops_en; /* manual bkops enable bit */
87 unsigned int data_sector_size; /* 512 bytes or 4KB */
88 unsigned int data_tag_unit_size; /* DATA TAG UNIT size */
89 unsigned int boot_ro_lock; /* ro lock support */
90 bool boot_ro_lockable;
91 bool ffu_capable; /* Firmware upgrade support */
92#define MMC_FIRMWARE_LEN 8
93 u8 fwrev[MMC_FIRMWARE_LEN]; /* FW version */
94 u8 raw_exception_status; /* 54 */
95 u8 raw_partition_support; /* 160 */
96 u8 raw_rpmb_size_mult; /* 168 */
97 u8 raw_erased_mem_count; /* 181 */
98 u8 strobe_support; /* 184 */
99 u8 raw_ext_csd_structure; /* 194 */
100 u8 raw_card_type; /* 196 */
101 u8 raw_driver_strength; /* 197 */
102 u8 out_of_int_time; /* 198 */
103 u8 raw_pwr_cl_52_195; /* 200 */
104 u8 raw_pwr_cl_26_195; /* 201 */
105 u8 raw_pwr_cl_52_360; /* 202 */
106 u8 raw_pwr_cl_26_360; /* 203 */
107 u8 raw_s_a_timeout; /* 217 */
108 u8 raw_hc_erase_gap_size; /* 221 */
109 u8 raw_erase_timeout_mult; /* 223 */
110 u8 raw_hc_erase_grp_size; /* 224 */
111 u8 raw_sec_trim_mult; /* 229 */
112 u8 raw_sec_erase_mult; /* 230 */
113 u8 raw_sec_feature_support;/* 231 */
114 u8 raw_trim_mult; /* 232 */
115 u8 raw_pwr_cl_200_195; /* 236 */
116 u8 raw_pwr_cl_200_360; /* 237 */
117 u8 raw_pwr_cl_ddr_52_195; /* 238 */
118 u8 raw_pwr_cl_ddr_52_360; /* 239 */
119 u8 raw_pwr_cl_ddr_200_360; /* 253 */
120 u8 raw_bkops_status; /* 246 */
121 u8 raw_sectors[4]; /* 212 - 4 bytes */
122
123 unsigned int feature_support;
124#define MMC_DISCARD_FEATURE BIT(0) /* CMD38 feature */
125};
126
127struct sd_scr {
128 unsigned char sda_vsn;
129 unsigned char sda_spec3;
130 unsigned char bus_widths;
131#define SD_SCR_BUS_WIDTH_1 (1<<0)
132#define SD_SCR_BUS_WIDTH_4 (1<<2)
133 unsigned char cmds;
134#define SD_SCR_CMD20_SUPPORT (1<<0)
135#define SD_SCR_CMD23_SUPPORT (1<<1)
136};
137
138struct sd_ssr {
139 unsigned int au; /* In sectors */
140 unsigned int erase_timeout; /* In milliseconds */
141 unsigned int erase_offset; /* In milliseconds */
142};
143
144struct sd_switch_caps {
145 unsigned int hs_max_dtr;
146 unsigned int uhs_max_dtr;
147#define HIGH_SPEED_MAX_DTR 50000000
148#define UHS_SDR104_MAX_DTR 208000000
149#define UHS_SDR50_MAX_DTR 100000000
150#define UHS_DDR50_MAX_DTR 50000000
151#define UHS_SDR25_MAX_DTR UHS_DDR50_MAX_DTR
152#define UHS_SDR12_MAX_DTR 25000000
153 unsigned int sd3_bus_mode;
154#define UHS_SDR12_BUS_SPEED 0
155#define HIGH_SPEED_BUS_SPEED 1
156#define UHS_SDR25_BUS_SPEED 1
157#define UHS_SDR50_BUS_SPEED 2
158#define UHS_SDR104_BUS_SPEED 3
159#define UHS_DDR50_BUS_SPEED 4
160
161#define SD_MODE_HIGH_SPEED (1 << HIGH_SPEED_BUS_SPEED)
162#define SD_MODE_UHS_SDR12 (1 << UHS_SDR12_BUS_SPEED)
163#define SD_MODE_UHS_SDR25 (1 << UHS_SDR25_BUS_SPEED)
164#define SD_MODE_UHS_SDR50 (1 << UHS_SDR50_BUS_SPEED)
165#define SD_MODE_UHS_SDR104 (1 << UHS_SDR104_BUS_SPEED)
166#define SD_MODE_UHS_DDR50 (1 << UHS_DDR50_BUS_SPEED)
167 unsigned int sd3_drv_type;
168#define SD_DRIVER_TYPE_B 0x01
169#define SD_DRIVER_TYPE_A 0x02
170#define SD_DRIVER_TYPE_C 0x04
171#define SD_DRIVER_TYPE_D 0x08
172 unsigned int sd3_curr_limit;
173#define SD_SET_CURRENT_LIMIT_200 0
174#define SD_SET_CURRENT_LIMIT_400 1
175#define SD_SET_CURRENT_LIMIT_600 2
176#define SD_SET_CURRENT_LIMIT_800 3
177#define SD_SET_CURRENT_NO_CHANGE (-1)
178
179#define SD_MAX_CURRENT_200 (1 << SD_SET_CURRENT_LIMIT_200)
180#define SD_MAX_CURRENT_400 (1 << SD_SET_CURRENT_LIMIT_400)
181#define SD_MAX_CURRENT_600 (1 << SD_SET_CURRENT_LIMIT_600)
182#define SD_MAX_CURRENT_800 (1 << SD_SET_CURRENT_LIMIT_800)
183};
184
185struct sdio_cccr {
186 unsigned int sdio_vsn;
187 unsigned int sd_vsn;
188 unsigned int multi_block:1,
189 low_speed:1,
190 wide_bus:1,
191 high_power:1,
192 high_speed:1,
193 disable_cd:1;
194};
195
196struct sdio_cis {
197 unsigned short vendor;
198 unsigned short device;
199 unsigned short blksize;
200 unsigned int max_dtr;
201};
202
203struct mmc_host;
204struct mmc_ios;
205struct sdio_func;
206struct sdio_func_tuple;
207
208#define SDIO_MAX_FUNCS 7
209
210enum mmc_blk_status {
211 MMC_BLK_SUCCESS = 0,
212 MMC_BLK_PARTIAL,
213 MMC_BLK_CMD_ERR,
214 MMC_BLK_RETRY,
215 MMC_BLK_ABORT,
216 MMC_BLK_DATA_ERR,
217 MMC_BLK_ECC_ERR,
218 MMC_BLK_NOMEDIUM,
219 MMC_BLK_NEW_REQUEST,
220};
221
222/* The number of MMC physical partitions. These consist of:
223 * boot partitions (2), general purpose partitions (4) and
224 * RPMB partition (1) in MMC v4.4.
225 */
226#define MMC_NUM_BOOT_PARTITION 2
227#define MMC_NUM_GP_PARTITION 4
228#define MMC_NUM_PHY_PARTITION 7
229#define MAX_MMC_PART_NAME_LEN 20
230
231/*
232 * MMC Physical partitions
233 */
234struct mmc_part {
235 unsigned int size; /* partition size (in bytes) */
236 unsigned int part_cfg; /* partition type */
237 char name[MAX_MMC_PART_NAME_LEN];
238 bool force_ro; /* to make boot parts RO by default */
239 unsigned int area_type;
240#define MMC_BLK_DATA_AREA_MAIN (1<<0)
241#define MMC_BLK_DATA_AREA_BOOT (1<<1)
242#define MMC_BLK_DATA_AREA_GP (1<<2)
243#define MMC_BLK_DATA_AREA_RPMB (1<<3)
244};
245
246/*
247 * MMC device
248 */
249struct mmc_card {
250 struct mmc_host *host; /* the host this device belongs to */
251 struct device dev; /* the device */
252 u32 ocr; /* the current OCR setting */
253 unsigned int rca; /* relative card address of device */
254 unsigned int type; /* card type */
255#define MMC_TYPE_MMC 0 /* MMC card */
256#define MMC_TYPE_SD 1 /* SD card */
257#define MMC_TYPE_SDIO 2 /* SDIO card */
258#define MMC_TYPE_SD_COMBO 3 /* SD combo (IO+mem) card */
259 unsigned int state; /* (our) card state */
260#define MMC_STATE_PRESENT (1<<0) /* present in sysfs */
261#define MMC_STATE_READONLY (1<<1) /* card is read-only */
262#define MMC_STATE_BLOCKADDR (1<<2) /* card uses block-addressing */
263#define MMC_CARD_SDXC (1<<3) /* card is SDXC */
264#define MMC_CARD_REMOVED (1<<4) /* card has been removed */
265#define MMC_STATE_DOING_BKOPS (1<<5) /* card is doing BKOPS */
266#define MMC_STATE_SUSPENDED (1<<6) /* card is suspended */
267 unsigned int quirks; /* card quirks */
268#define MMC_QUIRK_LENIENT_FN0 (1<<0) /* allow SDIO FN0 writes outside of the VS CCCR range */
269#define MMC_QUIRK_BLKSZ_FOR_BYTE_MODE (1<<1) /* use func->cur_blksize */
270 /* for byte mode */
271#define MMC_QUIRK_NONSTD_SDIO (1<<2) /* non-standard SDIO card attached */
272 /* (missing CIA registers) */
273#define MMC_QUIRK_NONSTD_FUNC_IF (1<<4) /* SDIO card has nonstd function interfaces */
274#define MMC_QUIRK_DISABLE_CD (1<<5) /* disconnect CD/DAT[3] resistor */
275#define MMC_QUIRK_INAND_CMD38 (1<<6) /* iNAND devices have broken CMD38 */
276#define MMC_QUIRK_BLK_NO_CMD23 (1<<7) /* Avoid CMD23 for regular multiblock */
277#define MMC_QUIRK_BROKEN_BYTE_MODE_512 (1<<8) /* Avoid sending 512 bytes in */
278 /* byte mode */
279#define MMC_QUIRK_LONG_READ_TIME (1<<9) /* Data read time > CSD says */
280#define MMC_QUIRK_SEC_ERASE_TRIM_BROKEN (1<<10) /* Skip secure for erase/trim */
281#define MMC_QUIRK_BROKEN_IRQ_POLLING (1<<11) /* Polling SDIO_CCCR_INTx could create a fake interrupt */
282#define MMC_QUIRK_TRIM_BROKEN (1<<12) /* Skip trim */
283#define MMC_QUIRK_BROKEN_HPI (1<<13) /* Disable broken HPI support */
284
285
286 unsigned int erase_size; /* erase size in sectors */
287 unsigned int erase_shift; /* if erase unit is power 2 */
288 unsigned int pref_erase; /* in sectors */
289 unsigned int eg_boundary; /* don't cross erase-group boundaries */
290 u8 erased_byte; /* value of erased bytes */
291
292 u32 raw_cid[4]; /* raw card CID */
293 u32 raw_csd[4]; /* raw card CSD */
294 u32 raw_scr[2]; /* raw card SCR */
295 struct mmc_cid cid; /* card identification */
296 struct mmc_csd csd; /* card specific */
297 struct mmc_ext_csd ext_csd; /* mmc v4 extended card specific */
298 struct sd_scr scr; /* extra SD information */
299 struct sd_ssr ssr; /* yet more SD information */
300 struct sd_switch_caps sw_caps; /* switch (CMD6) caps */
301
302 unsigned int sdio_funcs; /* number of SDIO functions */
303 struct sdio_cccr cccr; /* common card info */
304 struct sdio_cis cis; /* common tuple info */
305 struct sdio_func *sdio_func[SDIO_MAX_FUNCS]; /* SDIO functions (devices) */
306 struct sdio_func *sdio_single_irq; /* SDIO function when only one IRQ active */
307 unsigned num_info; /* number of info strings */
308 const char **info; /* info strings */
309 struct sdio_func_tuple *tuples; /* unknown common tuples */
310
311 unsigned int sd_bus_speed; /* Bus Speed Mode set for the card */
312 unsigned int mmc_avail_type; /* supported device type by both host and card */
313 unsigned int drive_strength; /* for UHS-I, HS200 or HS400 */
314
315 struct dentry *debugfs_root;
316 struct mmc_part part[MMC_NUM_PHY_PARTITION]; /* physical partitions */
317 unsigned int nr_parts;
318};
319
320/*
321 * This function fill contents in mmc_part.
322 */
323static inline void mmc_part_add(struct mmc_card *card, unsigned int size,
324 unsigned int part_cfg, char *name, int idx, bool ro,
325 int area_type)
326{
327 card->part[card->nr_parts].size = size;
328 card->part[card->nr_parts].part_cfg = part_cfg;
329 sprintf(card->part[card->nr_parts].name, name, idx);
330 card->part[card->nr_parts].force_ro = ro;
331 card->part[card->nr_parts].area_type = area_type;
332 card->nr_parts++;
333}
334
335static inline bool mmc_large_sector(struct mmc_card *card)
336{
337 return card->ext_csd.data_sector_size == 4096;
338}
339
340/*
341 * The world is not perfect and supplies us with broken mmc/sdio devices.
342 * For at least some of these bugs we need a work-around.
343 */
344
345struct mmc_fixup {
346 /* CID-specific fields. */
347 const char *name;
348
349 /* Valid revision range */
350 u64 rev_start, rev_end;
351
352 unsigned int manfid;
353 unsigned short oemid;
354
355 /* SDIO-specfic fields. You can use SDIO_ANY_ID here of course */
356 u16 cis_vendor, cis_device;
357
358 /* for MMC cards */
359 unsigned int ext_csd_rev;
360
361 void (*vendor_fixup)(struct mmc_card *card, int data);
362 int data;
363};
364
365#define CID_MANFID_ANY (-1u)
366#define CID_OEMID_ANY ((unsigned short) -1)
367#define CID_NAME_ANY (NULL)
368
369#define EXT_CSD_REV_ANY (-1u)
370
371#define CID_MANFID_SANDISK 0x2
372#define CID_MANFID_TOSHIBA 0x11
373#define CID_MANFID_MICRON 0x13
374#define CID_MANFID_SAMSUNG 0x15
375#define CID_MANFID_KINGSTON 0x70
376#define CID_MANFID_HYNIX 0x90
377
378#define END_FIXUP { NULL }
379
380#define _FIXUP_EXT(_name, _manfid, _oemid, _rev_start, _rev_end, \
381 _cis_vendor, _cis_device, \
382 _fixup, _data, _ext_csd_rev) \
383 { \
384 .name = (_name), \
385 .manfid = (_manfid), \
386 .oemid = (_oemid), \
387 .rev_start = (_rev_start), \
388 .rev_end = (_rev_end), \
389 .cis_vendor = (_cis_vendor), \
390 .cis_device = (_cis_device), \
391 .vendor_fixup = (_fixup), \
392 .data = (_data), \
393 .ext_csd_rev = (_ext_csd_rev), \
394 }
395
396#define MMC_FIXUP_REV(_name, _manfid, _oemid, _rev_start, _rev_end, \
397 _fixup, _data, _ext_csd_rev) \
398 _FIXUP_EXT(_name, _manfid, \
399 _oemid, _rev_start, _rev_end, \
400 SDIO_ANY_ID, SDIO_ANY_ID, \
401 _fixup, _data, _ext_csd_rev) \
402
403#define MMC_FIXUP(_name, _manfid, _oemid, _fixup, _data) \
404 MMC_FIXUP_REV(_name, _manfid, _oemid, 0, -1ull, _fixup, _data, \
405 EXT_CSD_REV_ANY)
406
407#define MMC_FIXUP_EXT_CSD_REV(_name, _manfid, _oemid, _fixup, _data, \
408 _ext_csd_rev) \
409 MMC_FIXUP_REV(_name, _manfid, _oemid, 0, -1ull, _fixup, _data, \
410 _ext_csd_rev)
411
412#define SDIO_FIXUP(_vendor, _device, _fixup, _data) \
413 _FIXUP_EXT(CID_NAME_ANY, CID_MANFID_ANY, \
414 CID_OEMID_ANY, 0, -1ull, \
415 _vendor, _device, \
416 _fixup, _data, EXT_CSD_REV_ANY) \
417
418#define cid_rev(hwrev, fwrev, year, month) \
419 (((u64) hwrev) << 40 | \
420 ((u64) fwrev) << 32 | \
421 ((u64) year) << 16 | \
422 ((u64) month))
423
424#define cid_rev_card(card) \
425 cid_rev(card->cid.hwrev, \
426 card->cid.fwrev, \
427 card->cid.year, \
428 card->cid.month)
429
430/*
431 * Unconditionally quirk add/remove.
432 */
433
434static inline void __maybe_unused add_quirk(struct mmc_card *card, int data)
435{
436 card->quirks |= data;
437}
438
439static inline void __maybe_unused remove_quirk(struct mmc_card *card, int data)
440{
441 card->quirks &= ~data;
442}
443
444#define mmc_card_mmc(c) ((c)->type == MMC_TYPE_MMC)
445#define mmc_card_sd(c) ((c)->type == MMC_TYPE_SD)
446#define mmc_card_sdio(c) ((c)->type == MMC_TYPE_SDIO)
447
448#define mmc_card_present(c) ((c)->state & MMC_STATE_PRESENT)
449#define mmc_card_readonly(c) ((c)->state & MMC_STATE_READONLY)
450#define mmc_card_blockaddr(c) ((c)->state & MMC_STATE_BLOCKADDR)
451#define mmc_card_ext_capacity(c) ((c)->state & MMC_CARD_SDXC)
452#define mmc_card_removed(c) ((c) && ((c)->state & MMC_CARD_REMOVED))
453#define mmc_card_doing_bkops(c) ((c)->state & MMC_STATE_DOING_BKOPS)
454#define mmc_card_suspended(c) ((c)->state & MMC_STATE_SUSPENDED)
455
456#define mmc_card_set_present(c) ((c)->state |= MMC_STATE_PRESENT)
457#define mmc_card_set_readonly(c) ((c)->state |= MMC_STATE_READONLY)
458#define mmc_card_set_blockaddr(c) ((c)->state |= MMC_STATE_BLOCKADDR)
459#define mmc_card_set_ext_capacity(c) ((c)->state |= MMC_CARD_SDXC)
460#define mmc_card_set_removed(c) ((c)->state |= MMC_CARD_REMOVED)
461#define mmc_card_set_doing_bkops(c) ((c)->state |= MMC_STATE_DOING_BKOPS)
462#define mmc_card_clr_doing_bkops(c) ((c)->state &= ~MMC_STATE_DOING_BKOPS)
463#define mmc_card_set_suspended(c) ((c)->state |= MMC_STATE_SUSPENDED)
464#define mmc_card_clr_suspended(c) ((c)->state &= ~MMC_STATE_SUSPENDED)
465
466/*
467 * Quirk add/remove for MMC products.
468 */
469
470static inline void __maybe_unused add_quirk_mmc(struct mmc_card *card, int data)
471{
472 if (mmc_card_mmc(card))
473 card->quirks |= data;
474}
475
476static inline void __maybe_unused remove_quirk_mmc(struct mmc_card *card,
477 int data)
478{
479 if (mmc_card_mmc(card))
480 card->quirks &= ~data;
481}
482
483/*
484 * Quirk add/remove for SD products.
485 */
486
487static inline void __maybe_unused add_quirk_sd(struct mmc_card *card, int data)
488{
489 if (mmc_card_sd(card))
490 card->quirks |= data;
491}
492
493static inline void __maybe_unused remove_quirk_sd(struct mmc_card *card,
494 int data)
495{
496 if (mmc_card_sd(card))
497 card->quirks &= ~data;
498}
499
500static inline int mmc_card_lenient_fn0(const struct mmc_card *c)
501{
502 return c->quirks & MMC_QUIRK_LENIENT_FN0;
503}
504
505static inline int mmc_blksz_for_byte_mode(const struct mmc_card *c)
506{
507 return c->quirks & MMC_QUIRK_BLKSZ_FOR_BYTE_MODE;
508}
509
510static inline int mmc_card_disable_cd(const struct mmc_card *c)
511{
512 return c->quirks & MMC_QUIRK_DISABLE_CD;
513}
514
515static inline int mmc_card_nonstd_func_interface(const struct mmc_card *c)
516{
517 return c->quirks & MMC_QUIRK_NONSTD_FUNC_IF;
518}
519
520static inline int mmc_card_broken_byte_mode_512(const struct mmc_card *c)
521{
522 return c->quirks & MMC_QUIRK_BROKEN_BYTE_MODE_512;
523}
524
525static inline int mmc_card_long_read_time(const struct mmc_card *c)
526{
527 return c->quirks & MMC_QUIRK_LONG_READ_TIME;
528}
529
530static inline int mmc_card_broken_irq_polling(const struct mmc_card *c)
531{
532 return c->quirks & MMC_QUIRK_BROKEN_IRQ_POLLING;
533}
534
535static inline int mmc_card_broken_hpi(const struct mmc_card *c)
536{
537 return c->quirks & MMC_QUIRK_BROKEN_HPI;
538}
539
540#define mmc_card_name(c) ((c)->cid.prod_name)
541#define mmc_card_id(c) (dev_name(&(c)->dev))
542
543#define mmc_dev_to_card(d) container_of(d, struct mmc_card, dev)
544
545/*
546 * MMC device driver (e.g., Flash card, I/O card...)
547 */
548struct mmc_driver {
549 struct device_driver drv;
550 int (*probe)(struct mmc_card *);
551 void (*remove)(struct mmc_card *);
552 void (*shutdown)(struct mmc_card *);
553};
554
555extern int mmc_register_driver(struct mmc_driver *);
556extern void mmc_unregister_driver(struct mmc_driver *);
557
558extern void mmc_fixup_device(struct mmc_card *card,
559 const struct mmc_fixup *table);
560
561#endif /* LINUX_MMC_CARD_H */