1 /* 2 * linux/include/linux/mmc/host.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 * Host driver specific definitions. 9 */ 10 #ifndef LINUX_MMC_HOST_H 11 #define LINUX_MMC_HOST_H 12 13 #include <linux/leds.h> 14 #include <linux/mutex.h> 15 #include <linux/timer.h> 16 #include <linux/sched.h> 17 #include <linux/device.h> 18 #include <linux/fault-inject.h> 19 20 #include <linux/mmc/core.h> 21 #include <linux/mmc/card.h> 22 #include <linux/mmc/mmc.h> 23 #include <linux/mmc/pm.h> 24 25 struct mmc_ios { 26 unsigned int clock; /* clock rate */ 27 unsigned short vdd; 28 29 /* vdd stores the bit number of the selected voltage range from below. */ 30 31 unsigned char bus_mode; /* command output mode */ 32 33 #define MMC_BUSMODE_OPENDRAIN 1 34 #define MMC_BUSMODE_PUSHPULL 2 35 36 unsigned char chip_select; /* SPI chip select */ 37 38 #define MMC_CS_DONTCARE 0 39 #define MMC_CS_HIGH 1 40 #define MMC_CS_LOW 2 41 42 unsigned char power_mode; /* power supply mode */ 43 44 #define MMC_POWER_OFF 0 45 #define MMC_POWER_UP 1 46 #define MMC_POWER_ON 2 47 #define MMC_POWER_UNDEFINED 3 48 49 unsigned char bus_width; /* data bus width */ 50 51 #define MMC_BUS_WIDTH_1 0 52 #define MMC_BUS_WIDTH_4 2 53 #define MMC_BUS_WIDTH_8 3 54 55 unsigned char timing; /* timing specification used */ 56 57 #define MMC_TIMING_LEGACY 0 58 #define MMC_TIMING_MMC_HS 1 59 #define MMC_TIMING_SD_HS 2 60 #define MMC_TIMING_UHS_SDR12 3 61 #define MMC_TIMING_UHS_SDR25 4 62 #define MMC_TIMING_UHS_SDR50 5 63 #define MMC_TIMING_UHS_SDR104 6 64 #define MMC_TIMING_UHS_DDR50 7 65 #define MMC_TIMING_MMC_DDR52 8 66 #define MMC_TIMING_MMC_HS200 9 67 #define MMC_TIMING_MMC_HS400 10 68 69 unsigned char signal_voltage; /* signalling voltage (1.8V or 3.3V) */ 70 71 #define MMC_SIGNAL_VOLTAGE_330 0 72 #define MMC_SIGNAL_VOLTAGE_180 1 73 #define MMC_SIGNAL_VOLTAGE_120 2 74 75 unsigned char drv_type; /* driver type (A, B, C, D) */ 76 77 #define MMC_SET_DRIVER_TYPE_B 0 78 #define MMC_SET_DRIVER_TYPE_A 1 79 #define MMC_SET_DRIVER_TYPE_C 2 80 #define MMC_SET_DRIVER_TYPE_D 3 81 82 bool enhanced_strobe; /* hs400es selection */ 83 }; 84 85 struct mmc_host_ops { 86 /* 87 * It is optional for the host to implement pre_req and post_req in 88 * order to support double buffering of requests (prepare one 89 * request while another request is active). 90 * pre_req() must always be followed by a post_req(). 91 * To undo a call made to pre_req(), call post_req() with 92 * a nonzero err condition. 93 */ 94 void (*post_req)(struct mmc_host *host, struct mmc_request *req, 95 int err); 96 void (*pre_req)(struct mmc_host *host, struct mmc_request *req, 97 bool is_first_req); 98 void (*request)(struct mmc_host *host, struct mmc_request *req); 99 100 /* 101 * Avoid calling the next three functions too often or in a "fast 102 * path", since underlaying controller might implement them in an 103 * expensive and/or slow way. Also note that these functions might 104 * sleep, so don't call them in the atomic contexts! 105 */ 106 107 /* 108 * Notes to the set_ios callback: 109 * ios->clock might be 0. For some controllers, setting 0Hz 110 * as any other frequency works. However, some controllers 111 * explicitly need to disable the clock. Otherwise e.g. voltage 112 * switching might fail because the SDCLK is not really quiet. 113 */ 114 void (*set_ios)(struct mmc_host *host, struct mmc_ios *ios); 115 116 /* 117 * Return values for the get_ro callback should be: 118 * 0 for a read/write card 119 * 1 for a read-only card 120 * -ENOSYS when not supported (equal to NULL callback) 121 * or a negative errno value when something bad happened 122 */ 123 int (*get_ro)(struct mmc_host *host); 124 125 /* 126 * Return values for the get_cd callback should be: 127 * 0 for a absent card 128 * 1 for a present card 129 * -ENOSYS when not supported (equal to NULL callback) 130 * or a negative errno value when something bad happened 131 */ 132 int (*get_cd)(struct mmc_host *host); 133 134 void (*enable_sdio_irq)(struct mmc_host *host, int enable); 135 136 /* optional callback for HC quirks */ 137 void (*init_card)(struct mmc_host *host, struct mmc_card *card); 138 139 int (*start_signal_voltage_switch)(struct mmc_host *host, struct mmc_ios *ios); 140 141 /* Check if the card is pulling dat[0:3] low */ 142 int (*card_busy)(struct mmc_host *host); 143 144 /* The tuning command opcode value is different for SD and eMMC cards */ 145 int (*execute_tuning)(struct mmc_host *host, u32 opcode); 146 147 /* Prepare HS400 target operating frequency depending host driver */ 148 int (*prepare_hs400_tuning)(struct mmc_host *host, struct mmc_ios *ios); 149 /* Prepare enhanced strobe depending host driver */ 150 void (*hs400_enhanced_strobe)(struct mmc_host *host, 151 struct mmc_ios *ios); 152 int (*select_drive_strength)(struct mmc_card *card, 153 unsigned int max_dtr, int host_drv, 154 int card_drv, int *drv_type); 155 void (*hw_reset)(struct mmc_host *host); 156 void (*card_event)(struct mmc_host *host); 157 158 /* 159 * Optional callback to support controllers with HW issues for multiple 160 * I/O. Returns the number of supported blocks for the request. 161 */ 162 int (*multi_io_quirk)(struct mmc_card *card, 163 unsigned int direction, int blk_size); 164 }; 165 166 struct mmc_card; 167 struct device; 168 169 struct mmc_async_req { 170 /* active mmc request */ 171 struct mmc_request *mrq; 172 /* 173 * Check error status of completed mmc request. 174 * Returns 0 if success otherwise non zero. 175 */ 176 int (*err_check) (struct mmc_card *, struct mmc_async_req *); 177 }; 178 179 /** 180 * struct mmc_slot - MMC slot functions 181 * 182 * @cd_irq: MMC/SD-card slot hotplug detection IRQ or -EINVAL 183 * @handler_priv: MMC/SD-card slot context 184 * 185 * Some MMC/SD host controllers implement slot-functions like card and 186 * write-protect detection natively. However, a large number of controllers 187 * leave these functions to the CPU. This struct provides a hook to attach 188 * such slot-function drivers. 189 */ 190 struct mmc_slot { 191 int cd_irq; 192 void *handler_priv; 193 }; 194 195 /** 196 * mmc_context_info - synchronization details for mmc context 197 * @is_done_rcv wake up reason was done request 198 * @is_new_req wake up reason was new request 199 * @is_waiting_last_req mmc context waiting for single running request 200 * @wait wait queue 201 * @lock lock to protect data fields 202 */ 203 struct mmc_context_info { 204 bool is_done_rcv; 205 bool is_new_req; 206 bool is_waiting_last_req; 207 wait_queue_head_t wait; 208 spinlock_t lock; 209 }; 210 211 struct regulator; 212 struct mmc_pwrseq; 213 214 struct mmc_supply { 215 struct regulator *vmmc; /* Card power supply */ 216 struct regulator *vqmmc; /* Optional Vccq supply */ 217 }; 218 219 struct mmc_host { 220 struct device *parent; 221 struct device class_dev; 222 int index; 223 const struct mmc_host_ops *ops; 224 struct mmc_pwrseq *pwrseq; 225 unsigned int f_min; 226 unsigned int f_max; 227 unsigned int f_init; 228 u32 ocr_avail; 229 u32 ocr_avail_sdio; /* SDIO-specific OCR */ 230 u32 ocr_avail_sd; /* SD-specific OCR */ 231 u32 ocr_avail_mmc; /* MMC-specific OCR */ 232 #ifdef CONFIG_PM_SLEEP 233 struct notifier_block pm_notify; 234 #endif 235 u32 max_current_330; 236 u32 max_current_300; 237 u32 max_current_180; 238 239 #define MMC_VDD_165_195 0x00000080 /* VDD voltage 1.65 - 1.95 */ 240 #define MMC_VDD_20_21 0x00000100 /* VDD voltage 2.0 ~ 2.1 */ 241 #define MMC_VDD_21_22 0x00000200 /* VDD voltage 2.1 ~ 2.2 */ 242 #define MMC_VDD_22_23 0x00000400 /* VDD voltage 2.2 ~ 2.3 */ 243 #define MMC_VDD_23_24 0x00000800 /* VDD voltage 2.3 ~ 2.4 */ 244 #define MMC_VDD_24_25 0x00001000 /* VDD voltage 2.4 ~ 2.5 */ 245 #define MMC_VDD_25_26 0x00002000 /* VDD voltage 2.5 ~ 2.6 */ 246 #define MMC_VDD_26_27 0x00004000 /* VDD voltage 2.6 ~ 2.7 */ 247 #define MMC_VDD_27_28 0x00008000 /* VDD voltage 2.7 ~ 2.8 */ 248 #define MMC_VDD_28_29 0x00010000 /* VDD voltage 2.8 ~ 2.9 */ 249 #define MMC_VDD_29_30 0x00020000 /* VDD voltage 2.9 ~ 3.0 */ 250 #define MMC_VDD_30_31 0x00040000 /* VDD voltage 3.0 ~ 3.1 */ 251 #define MMC_VDD_31_32 0x00080000 /* VDD voltage 3.1 ~ 3.2 */ 252 #define MMC_VDD_32_33 0x00100000 /* VDD voltage 3.2 ~ 3.3 */ 253 #define MMC_VDD_33_34 0x00200000 /* VDD voltage 3.3 ~ 3.4 */ 254 #define MMC_VDD_34_35 0x00400000 /* VDD voltage 3.4 ~ 3.5 */ 255 #define MMC_VDD_35_36 0x00800000 /* VDD voltage 3.5 ~ 3.6 */ 256 257 u32 caps; /* Host capabilities */ 258 259 #define MMC_CAP_4_BIT_DATA (1 << 0) /* Can the host do 4 bit transfers */ 260 #define MMC_CAP_MMC_HIGHSPEED (1 << 1) /* Can do MMC high-speed timing */ 261 #define MMC_CAP_SD_HIGHSPEED (1 << 2) /* Can do SD high-speed timing */ 262 #define MMC_CAP_SDIO_IRQ (1 << 3) /* Can signal pending SDIO IRQs */ 263 #define MMC_CAP_SPI (1 << 4) /* Talks only SPI protocols */ 264 #define MMC_CAP_NEEDS_POLL (1 << 5) /* Needs polling for card-detection */ 265 #define MMC_CAP_8_BIT_DATA (1 << 6) /* Can the host do 8 bit transfers */ 266 #define MMC_CAP_AGGRESSIVE_PM (1 << 7) /* Suspend (e)MMC/SD at idle */ 267 #define MMC_CAP_NONREMOVABLE (1 << 8) /* Nonremovable e.g. eMMC */ 268 #define MMC_CAP_WAIT_WHILE_BUSY (1 << 9) /* Waits while card is busy */ 269 #define MMC_CAP_ERASE (1 << 10) /* Allow erase/trim commands */ 270 #define MMC_CAP_1_8V_DDR (1 << 11) /* can support */ 271 /* DDR mode at 1.8V */ 272 #define MMC_CAP_1_2V_DDR (1 << 12) /* can support */ 273 /* DDR mode at 1.2V */ 274 #define MMC_CAP_POWER_OFF_CARD (1 << 13) /* Can power off after boot */ 275 #define MMC_CAP_BUS_WIDTH_TEST (1 << 14) /* CMD14/CMD19 bus width ok */ 276 #define MMC_CAP_UHS_SDR12 (1 << 15) /* Host supports UHS SDR12 mode */ 277 #define MMC_CAP_UHS_SDR25 (1 << 16) /* Host supports UHS SDR25 mode */ 278 #define MMC_CAP_UHS_SDR50 (1 << 17) /* Host supports UHS SDR50 mode */ 279 #define MMC_CAP_UHS_SDR104 (1 << 18) /* Host supports UHS SDR104 mode */ 280 #define MMC_CAP_UHS_DDR50 (1 << 19) /* Host supports UHS DDR50 mode */ 281 #define MMC_CAP_DRIVER_TYPE_A (1 << 23) /* Host supports Driver Type A */ 282 #define MMC_CAP_DRIVER_TYPE_C (1 << 24) /* Host supports Driver Type C */ 283 #define MMC_CAP_DRIVER_TYPE_D (1 << 25) /* Host supports Driver Type D */ 284 #define MMC_CAP_CMD_DURING_TFR (1 << 29) /* Commands during data transfer */ 285 #define MMC_CAP_CMD23 (1 << 30) /* CMD23 supported. */ 286 #define MMC_CAP_HW_RESET (1 << 31) /* Hardware reset */ 287 288 u32 caps2; /* More host capabilities */ 289 290 #define MMC_CAP2_BOOTPART_NOACC (1 << 0) /* Boot partition no access */ 291 #define MMC_CAP2_FULL_PWR_CYCLE (1 << 2) /* Can do full power cycle */ 292 #define MMC_CAP2_HS200_1_8V_SDR (1 << 5) /* can support */ 293 #define MMC_CAP2_HS200_1_2V_SDR (1 << 6) /* can support */ 294 #define MMC_CAP2_HS200 (MMC_CAP2_HS200_1_8V_SDR | \ 295 MMC_CAP2_HS200_1_2V_SDR) 296 #define MMC_CAP2_HC_ERASE_SZ (1 << 9) /* High-capacity erase size */ 297 #define MMC_CAP2_CD_ACTIVE_HIGH (1 << 10) /* Card-detect signal active high */ 298 #define MMC_CAP2_RO_ACTIVE_HIGH (1 << 11) /* Write-protect signal active high */ 299 #define MMC_CAP2_PACKED_RD (1 << 12) /* Allow packed read */ 300 #define MMC_CAP2_PACKED_WR (1 << 13) /* Allow packed write */ 301 #define MMC_CAP2_PACKED_CMD (MMC_CAP2_PACKED_RD | \ 302 MMC_CAP2_PACKED_WR) 303 #define MMC_CAP2_NO_PRESCAN_POWERUP (1 << 14) /* Don't power up before scan */ 304 #define MMC_CAP2_HS400_1_8V (1 << 15) /* Can support HS400 1.8V */ 305 #define MMC_CAP2_HS400_1_2V (1 << 16) /* Can support HS400 1.2V */ 306 #define MMC_CAP2_HS400 (MMC_CAP2_HS400_1_8V | \ 307 MMC_CAP2_HS400_1_2V) 308 #define MMC_CAP2_HSX00_1_2V (MMC_CAP2_HS200_1_2V_SDR | MMC_CAP2_HS400_1_2V) 309 #define MMC_CAP2_SDIO_IRQ_NOTHREAD (1 << 17) 310 #define MMC_CAP2_NO_WRITE_PROTECT (1 << 18) /* No physical write protect pin, assume that card is always read-write */ 311 #define MMC_CAP2_NO_SDIO (1 << 19) /* Do not send SDIO commands during initialization */ 312 #define MMC_CAP2_HS400_ES (1 << 20) /* Host supports enhanced strobe */ 313 #define MMC_CAP2_NO_SD (1 << 21) /* Do not send SD commands during initialization */ 314 #define MMC_CAP2_NO_MMC (1 << 22) /* Do not send (e)MMC commands during initialization */ 315 316 mmc_pm_flag_t pm_caps; /* supported pm features */ 317 318 /* host specific block data */ 319 unsigned int max_seg_size; /* see blk_queue_max_segment_size */ 320 unsigned short max_segs; /* see blk_queue_max_segments */ 321 unsigned short unused; 322 unsigned int max_req_size; /* maximum number of bytes in one req */ 323 unsigned int max_blk_size; /* maximum size of one mmc block */ 324 unsigned int max_blk_count; /* maximum number of blocks in one req */ 325 unsigned int max_busy_timeout; /* max busy timeout in ms */ 326 327 /* private data */ 328 spinlock_t lock; /* lock for claim and bus ops */ 329 330 struct mmc_ios ios; /* current io bus settings */ 331 332 /* group bitfields together to minimize padding */ 333 unsigned int use_spi_crc:1; 334 unsigned int claimed:1; /* host exclusively claimed */ 335 unsigned int bus_dead:1; /* bus has been released */ 336 #ifdef CONFIG_MMC_DEBUG 337 unsigned int removed:1; /* host is being removed */ 338 #endif 339 unsigned int can_retune:1; /* re-tuning can be used */ 340 unsigned int doing_retune:1; /* re-tuning in progress */ 341 unsigned int retune_now:1; /* do re-tuning at next req */ 342 unsigned int retune_paused:1; /* re-tuning is temporarily disabled */ 343 344 int rescan_disable; /* disable card detection */ 345 int rescan_entered; /* used with nonremovable devices */ 346 347 int need_retune; /* re-tuning is needed */ 348 int hold_retune; /* hold off re-tuning */ 349 unsigned int retune_period; /* re-tuning period in secs */ 350 struct timer_list retune_timer; /* for periodic re-tuning */ 351 352 bool trigger_card_event; /* card_event necessary */ 353 354 struct mmc_card *card; /* device attached to this host */ 355 356 wait_queue_head_t wq; 357 struct task_struct *claimer; /* task that has host claimed */ 358 int claim_cnt; /* "claim" nesting count */ 359 360 struct delayed_work detect; 361 int detect_change; /* card detect flag */ 362 struct mmc_slot slot; 363 364 const struct mmc_bus_ops *bus_ops; /* current bus driver */ 365 unsigned int bus_refs; /* reference counter */ 366 367 unsigned int sdio_irqs; 368 struct task_struct *sdio_irq_thread; 369 bool sdio_irq_pending; 370 atomic_t sdio_irq_thread_abort; 371 372 mmc_pm_flag_t pm_flags; /* requested pm features */ 373 374 struct led_trigger *led; /* activity led */ 375 376 #ifdef CONFIG_REGULATOR 377 bool regulator_enabled; /* regulator state */ 378 #endif 379 struct mmc_supply supply; 380 381 struct dentry *debugfs_root; 382 383 struct mmc_async_req *areq; /* active async req */ 384 struct mmc_context_info context_info; /* async synchronization info */ 385 386 /* Ongoing data transfer that allows commands during transfer */ 387 struct mmc_request *ongoing_mrq; 388 389 #ifdef CONFIG_FAIL_MMC_REQUEST 390 struct fault_attr fail_mmc_request; 391 #endif 392 393 unsigned int actual_clock; /* Actual HC clock rate */ 394 395 unsigned int slotno; /* used for sdio acpi binding */ 396 397 int dsr_req; /* DSR value is valid */ 398 u32 dsr; /* optional driver stage (DSR) value */ 399 400 unsigned long private[0] ____cacheline_aligned; 401 }; 402 403 struct mmc_host *mmc_alloc_host(int extra, struct device *); 404 int mmc_add_host(struct mmc_host *); 405 void mmc_remove_host(struct mmc_host *); 406 void mmc_free_host(struct mmc_host *); 407 int mmc_of_parse(struct mmc_host *host); 408 409 static inline void *mmc_priv(struct mmc_host *host) 410 { 411 return (void *)host->private; 412 } 413 414 #define mmc_host_is_spi(host) ((host)->caps & MMC_CAP_SPI) 415 416 #define mmc_dev(x) ((x)->parent) 417 #define mmc_classdev(x) (&(x)->class_dev) 418 #define mmc_hostname(x) (dev_name(&(x)->class_dev)) 419 420 int mmc_power_save_host(struct mmc_host *host); 421 int mmc_power_restore_host(struct mmc_host *host); 422 423 void mmc_detect_change(struct mmc_host *, unsigned long delay); 424 void mmc_request_done(struct mmc_host *, struct mmc_request *); 425 void mmc_command_done(struct mmc_host *host, struct mmc_request *mrq); 426 427 static inline void mmc_signal_sdio_irq(struct mmc_host *host) 428 { 429 host->ops->enable_sdio_irq(host, 0); 430 host->sdio_irq_pending = true; 431 if (host->sdio_irq_thread) 432 wake_up_process(host->sdio_irq_thread); 433 } 434 435 void sdio_run_irqs(struct mmc_host *host); 436 437 #ifdef CONFIG_REGULATOR 438 int mmc_regulator_get_ocrmask(struct regulator *supply); 439 int mmc_regulator_set_ocr(struct mmc_host *mmc, 440 struct regulator *supply, 441 unsigned short vdd_bit); 442 int mmc_regulator_set_vqmmc(struct mmc_host *mmc, struct mmc_ios *ios); 443 #else 444 static inline int mmc_regulator_get_ocrmask(struct regulator *supply) 445 { 446 return 0; 447 } 448 449 static inline int mmc_regulator_set_ocr(struct mmc_host *mmc, 450 struct regulator *supply, 451 unsigned short vdd_bit) 452 { 453 return 0; 454 } 455 456 static inline int mmc_regulator_set_vqmmc(struct mmc_host *mmc, 457 struct mmc_ios *ios) 458 { 459 return -EINVAL; 460 } 461 #endif 462 463 int mmc_regulator_get_supply(struct mmc_host *mmc); 464 465 static inline int mmc_card_is_removable(struct mmc_host *host) 466 { 467 return !(host->caps & MMC_CAP_NONREMOVABLE); 468 } 469 470 static inline int mmc_card_keep_power(struct mmc_host *host) 471 { 472 return host->pm_flags & MMC_PM_KEEP_POWER; 473 } 474 475 static inline int mmc_card_wake_sdio_irq(struct mmc_host *host) 476 { 477 return host->pm_flags & MMC_PM_WAKE_SDIO_IRQ; 478 } 479 480 static inline int mmc_host_cmd23(struct mmc_host *host) 481 { 482 return host->caps & MMC_CAP_CMD23; 483 } 484 485 static inline int mmc_boot_partition_access(struct mmc_host *host) 486 { 487 return !(host->caps2 & MMC_CAP2_BOOTPART_NOACC); 488 } 489 490 static inline int mmc_host_uhs(struct mmc_host *host) 491 { 492 return host->caps & 493 (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | 494 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | 495 MMC_CAP_UHS_DDR50); 496 } 497 498 static inline int mmc_host_packed_wr(struct mmc_host *host) 499 { 500 return host->caps2 & MMC_CAP2_PACKED_WR; 501 } 502 503 static inline int mmc_card_hs(struct mmc_card *card) 504 { 505 return card->host->ios.timing == MMC_TIMING_SD_HS || 506 card->host->ios.timing == MMC_TIMING_MMC_HS; 507 } 508 509 static inline int mmc_card_uhs(struct mmc_card *card) 510 { 511 return card->host->ios.timing >= MMC_TIMING_UHS_SDR12 && 512 card->host->ios.timing <= MMC_TIMING_UHS_DDR50; 513 } 514 515 static inline bool mmc_card_hs200(struct mmc_card *card) 516 { 517 return card->host->ios.timing == MMC_TIMING_MMC_HS200; 518 } 519 520 static inline bool mmc_card_ddr52(struct mmc_card *card) 521 { 522 return card->host->ios.timing == MMC_TIMING_MMC_DDR52; 523 } 524 525 static inline bool mmc_card_hs400(struct mmc_card *card) 526 { 527 return card->host->ios.timing == MMC_TIMING_MMC_HS400; 528 } 529 530 static inline bool mmc_card_hs400es(struct mmc_card *card) 531 { 532 return card->host->ios.enhanced_strobe; 533 } 534 535 void mmc_retune_timer_stop(struct mmc_host *host); 536 537 static inline void mmc_retune_needed(struct mmc_host *host) 538 { 539 if (host->can_retune) 540 host->need_retune = 1; 541 } 542 543 static inline void mmc_retune_recheck(struct mmc_host *host) 544 { 545 if (host->hold_retune <= 1) 546 host->retune_now = 1; 547 } 548 549 void mmc_retune_pause(struct mmc_host *host); 550 void mmc_retune_unpause(struct mmc_host *host); 551 552 #endif /* LINUX_MMC_HOST_H */ 553