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/sched.h> 14 #include <linux/device.h> 15 #include <linux/fault-inject.h> 16 17 #include <linux/mmc/core.h> 18 #include <linux/mmc/card.h> 19 #include <linux/mmc/pm.h> 20 #include <linux/dma-direction.h> 21 22 struct mmc_ios { 23 unsigned int clock; /* clock rate */ 24 unsigned short vdd; 25 26 /* vdd stores the bit number of the selected voltage range from below. */ 27 28 unsigned char bus_mode; /* command output mode */ 29 30 #define MMC_BUSMODE_OPENDRAIN 1 31 #define MMC_BUSMODE_PUSHPULL 2 32 33 unsigned char chip_select; /* SPI chip select */ 34 35 #define MMC_CS_DONTCARE 0 36 #define MMC_CS_HIGH 1 37 #define MMC_CS_LOW 2 38 39 unsigned char power_mode; /* power supply mode */ 40 41 #define MMC_POWER_OFF 0 42 #define MMC_POWER_UP 1 43 #define MMC_POWER_ON 2 44 #define MMC_POWER_UNDEFINED 3 45 46 unsigned char bus_width; /* data bus width */ 47 48 #define MMC_BUS_WIDTH_1 0 49 #define MMC_BUS_WIDTH_4 2 50 #define MMC_BUS_WIDTH_8 3 51 52 unsigned char timing; /* timing specification used */ 53 54 #define MMC_TIMING_LEGACY 0 55 #define MMC_TIMING_MMC_HS 1 56 #define MMC_TIMING_SD_HS 2 57 #define MMC_TIMING_UHS_SDR12 3 58 #define MMC_TIMING_UHS_SDR25 4 59 #define MMC_TIMING_UHS_SDR50 5 60 #define MMC_TIMING_UHS_SDR104 6 61 #define MMC_TIMING_UHS_DDR50 7 62 #define MMC_TIMING_MMC_DDR52 8 63 #define MMC_TIMING_MMC_HS200 9 64 #define MMC_TIMING_MMC_HS400 10 65 66 unsigned char signal_voltage; /* signalling voltage (1.8V or 3.3V) */ 67 68 #define MMC_SIGNAL_VOLTAGE_330 0 69 #define MMC_SIGNAL_VOLTAGE_180 1 70 #define MMC_SIGNAL_VOLTAGE_120 2 71 72 unsigned char drv_type; /* driver type (A, B, C, D) */ 73 74 #define MMC_SET_DRIVER_TYPE_B 0 75 #define MMC_SET_DRIVER_TYPE_A 1 76 #define MMC_SET_DRIVER_TYPE_C 2 77 #define MMC_SET_DRIVER_TYPE_D 3 78 79 bool enhanced_strobe; /* hs400es selection */ 80 }; 81 82 struct mmc_host; 83 84 struct mmc_host_ops { 85 /* 86 * It is optional for the host to implement pre_req and post_req in 87 * order to support double buffering of requests (prepare one 88 * request while another request is active). 89 * pre_req() must always be followed by a post_req(). 90 * To undo a call made to pre_req(), call post_req() with 91 * a nonzero err condition. 92 */ 93 void (*post_req)(struct mmc_host *host, struct mmc_request *req, 94 int err); 95 void (*pre_req)(struct mmc_host *host, struct mmc_request *req); 96 void (*request)(struct mmc_host *host, struct mmc_request *req); 97 98 /* 99 * Avoid calling the next three functions too often or in a "fast 100 * path", since underlaying controller might implement them in an 101 * expensive and/or slow way. Also note that these functions might 102 * sleep, so don't call them in the atomic contexts! 103 */ 104 105 /* 106 * Notes to the set_ios callback: 107 * ios->clock might be 0. For some controllers, setting 0Hz 108 * as any other frequency works. However, some controllers 109 * explicitly need to disable the clock. Otherwise e.g. voltage 110 * switching might fail because the SDCLK is not really quiet. 111 */ 112 void (*set_ios)(struct mmc_host *host, struct mmc_ios *ios); 113 114 /* 115 * Return values for the get_ro callback should be: 116 * 0 for a read/write card 117 * 1 for a read-only card 118 * -ENOSYS when not supported (equal to NULL callback) 119 * or a negative errno value when something bad happened 120 */ 121 int (*get_ro)(struct mmc_host *host); 122 123 /* 124 * Return values for the get_cd callback should be: 125 * 0 for a absent card 126 * 1 for a present card 127 * -ENOSYS when not supported (equal to NULL callback) 128 * or a negative errno value when something bad happened 129 */ 130 int (*get_cd)(struct mmc_host *host); 131 132 void (*enable_sdio_irq)(struct mmc_host *host, int enable); 133 void (*ack_sdio_irq)(struct mmc_host *host); 134 135 /* optional callback for HC quirks */ 136 void (*init_card)(struct mmc_host *host, struct mmc_card *card); 137 138 int (*start_signal_voltage_switch)(struct mmc_host *host, struct mmc_ios *ios); 139 140 /* Check if the card is pulling dat[0:3] low */ 141 int (*card_busy)(struct mmc_host *host); 142 143 /* The tuning command opcode value is different for SD and eMMC cards */ 144 int (*execute_tuning)(struct mmc_host *host, u32 opcode); 145 146 /* Prepare HS400 target operating frequency depending host driver */ 147 int (*prepare_hs400_tuning)(struct mmc_host *host, struct mmc_ios *ios); 148 /* Prepare enhanced strobe depending host driver */ 149 void (*hs400_enhanced_strobe)(struct mmc_host *host, 150 struct mmc_ios *ios); 151 int (*select_drive_strength)(struct mmc_card *card, 152 unsigned int max_dtr, int host_drv, 153 int card_drv, int *drv_type); 154 void (*hw_reset)(struct mmc_host *host); 155 void (*card_event)(struct mmc_host *host); 156 157 /* 158 * Optional callback to support controllers with HW issues for multiple 159 * I/O. Returns the number of supported blocks for the request. 160 */ 161 int (*multi_io_quirk)(struct mmc_card *card, 162 unsigned int direction, int blk_size); 163 }; 164 165 struct mmc_async_req { 166 /* active mmc request */ 167 struct mmc_request *mrq; 168 /* 169 * Check error status of completed mmc request. 170 * Returns 0 if success otherwise non zero. 171 */ 172 enum mmc_blk_status (*err_check)(struct mmc_card *, struct mmc_async_req *); 173 }; 174 175 /** 176 * struct mmc_slot - MMC slot functions 177 * 178 * @cd_irq: MMC/SD-card slot hotplug detection IRQ or -EINVAL 179 * @handler_priv: MMC/SD-card slot context 180 * 181 * Some MMC/SD host controllers implement slot-functions like card and 182 * write-protect detection natively. However, a large number of controllers 183 * leave these functions to the CPU. This struct provides a hook to attach 184 * such slot-function drivers. 185 */ 186 struct mmc_slot { 187 int cd_irq; 188 bool cd_wake_enabled; 189 void *handler_priv; 190 }; 191 192 /** 193 * mmc_context_info - synchronization details for mmc context 194 * @is_done_rcv wake up reason was done request 195 * @is_new_req wake up reason was new request 196 * @is_waiting_last_req mmc context waiting for single running request 197 * @wait wait queue 198 */ 199 struct mmc_context_info { 200 bool is_done_rcv; 201 bool is_new_req; 202 bool is_waiting_last_req; 203 wait_queue_head_t wait; 204 }; 205 206 struct regulator; 207 struct mmc_pwrseq; 208 209 struct mmc_supply { 210 struct regulator *vmmc; /* Card power supply */ 211 struct regulator *vqmmc; /* Optional Vccq supply */ 212 }; 213 214 struct mmc_host { 215 struct device *parent; 216 struct device class_dev; 217 int index; 218 const struct mmc_host_ops *ops; 219 struct mmc_pwrseq *pwrseq; 220 unsigned int f_min; 221 unsigned int f_max; 222 unsigned int f_init; 223 u32 ocr_avail; 224 u32 ocr_avail_sdio; /* SDIO-specific OCR */ 225 u32 ocr_avail_sd; /* SD-specific OCR */ 226 u32 ocr_avail_mmc; /* MMC-specific OCR */ 227 #ifdef CONFIG_PM_SLEEP 228 struct notifier_block pm_notify; 229 #endif 230 u32 max_current_330; 231 u32 max_current_300; 232 u32 max_current_180; 233 234 #define MMC_VDD_165_195 0x00000080 /* VDD voltage 1.65 - 1.95 */ 235 #define MMC_VDD_20_21 0x00000100 /* VDD voltage 2.0 ~ 2.1 */ 236 #define MMC_VDD_21_22 0x00000200 /* VDD voltage 2.1 ~ 2.2 */ 237 #define MMC_VDD_22_23 0x00000400 /* VDD voltage 2.2 ~ 2.3 */ 238 #define MMC_VDD_23_24 0x00000800 /* VDD voltage 2.3 ~ 2.4 */ 239 #define MMC_VDD_24_25 0x00001000 /* VDD voltage 2.4 ~ 2.5 */ 240 #define MMC_VDD_25_26 0x00002000 /* VDD voltage 2.5 ~ 2.6 */ 241 #define MMC_VDD_26_27 0x00004000 /* VDD voltage 2.6 ~ 2.7 */ 242 #define MMC_VDD_27_28 0x00008000 /* VDD voltage 2.7 ~ 2.8 */ 243 #define MMC_VDD_28_29 0x00010000 /* VDD voltage 2.8 ~ 2.9 */ 244 #define MMC_VDD_29_30 0x00020000 /* VDD voltage 2.9 ~ 3.0 */ 245 #define MMC_VDD_30_31 0x00040000 /* VDD voltage 3.0 ~ 3.1 */ 246 #define MMC_VDD_31_32 0x00080000 /* VDD voltage 3.1 ~ 3.2 */ 247 #define MMC_VDD_32_33 0x00100000 /* VDD voltage 3.2 ~ 3.3 */ 248 #define MMC_VDD_33_34 0x00200000 /* VDD voltage 3.3 ~ 3.4 */ 249 #define MMC_VDD_34_35 0x00400000 /* VDD voltage 3.4 ~ 3.5 */ 250 #define MMC_VDD_35_36 0x00800000 /* VDD voltage 3.5 ~ 3.6 */ 251 252 u32 caps; /* Host capabilities */ 253 254 #define MMC_CAP_4_BIT_DATA (1 << 0) /* Can the host do 4 bit transfers */ 255 #define MMC_CAP_MMC_HIGHSPEED (1 << 1) /* Can do MMC high-speed timing */ 256 #define MMC_CAP_SD_HIGHSPEED (1 << 2) /* Can do SD high-speed timing */ 257 #define MMC_CAP_SDIO_IRQ (1 << 3) /* Can signal pending SDIO IRQs */ 258 #define MMC_CAP_SPI (1 << 4) /* Talks only SPI protocols */ 259 #define MMC_CAP_NEEDS_POLL (1 << 5) /* Needs polling for card-detection */ 260 #define MMC_CAP_8_BIT_DATA (1 << 6) /* Can the host do 8 bit transfers */ 261 #define MMC_CAP_AGGRESSIVE_PM (1 << 7) /* Suspend (e)MMC/SD at idle */ 262 #define MMC_CAP_NONREMOVABLE (1 << 8) /* Nonremovable e.g. eMMC */ 263 #define MMC_CAP_WAIT_WHILE_BUSY (1 << 9) /* Waits while card is busy */ 264 #define MMC_CAP_ERASE (1 << 10) /* Allow erase/trim commands */ 265 #define MMC_CAP_3_3V_DDR (1 << 11) /* Host supports eMMC DDR 3.3V */ 266 #define MMC_CAP_1_8V_DDR (1 << 12) /* Host supports eMMC DDR 1.8V */ 267 #define MMC_CAP_1_2V_DDR (1 << 13) /* Host supports eMMC DDR 1.2V */ 268 #define MMC_CAP_POWER_OFF_CARD (1 << 14) /* Can power off after boot */ 269 #define MMC_CAP_BUS_WIDTH_TEST (1 << 15) /* CMD14/CMD19 bus width ok */ 270 #define MMC_CAP_UHS_SDR12 (1 << 16) /* Host supports UHS SDR12 mode */ 271 #define MMC_CAP_UHS_SDR25 (1 << 17) /* Host supports UHS SDR25 mode */ 272 #define MMC_CAP_UHS_SDR50 (1 << 18) /* Host supports UHS SDR50 mode */ 273 #define MMC_CAP_UHS_SDR104 (1 << 19) /* Host supports UHS SDR104 mode */ 274 #define MMC_CAP_UHS_DDR50 (1 << 20) /* Host supports UHS DDR50 mode */ 275 #define MMC_CAP_NO_BOUNCE_BUFF (1 << 21) /* Disable bounce buffers on host */ 276 #define MMC_CAP_DRIVER_TYPE_A (1 << 23) /* Host supports Driver Type A */ 277 #define MMC_CAP_DRIVER_TYPE_C (1 << 24) /* Host supports Driver Type C */ 278 #define MMC_CAP_DRIVER_TYPE_D (1 << 25) /* Host supports Driver Type D */ 279 #define MMC_CAP_CD_WAKE (1 << 28) /* Enable card detect wake */ 280 #define MMC_CAP_CMD_DURING_TFR (1 << 29) /* Commands during data transfer */ 281 #define MMC_CAP_CMD23 (1 << 30) /* CMD23 supported. */ 282 #define MMC_CAP_HW_RESET (1 << 31) /* Hardware reset */ 283 284 u32 caps2; /* More host capabilities */ 285 286 #define MMC_CAP2_BOOTPART_NOACC (1 << 0) /* Boot partition no access */ 287 #define MMC_CAP2_FULL_PWR_CYCLE (1 << 2) /* Can do full power cycle */ 288 #define MMC_CAP2_HS200_1_8V_SDR (1 << 5) /* can support */ 289 #define MMC_CAP2_HS200_1_2V_SDR (1 << 6) /* can support */ 290 #define MMC_CAP2_HS200 (MMC_CAP2_HS200_1_8V_SDR | \ 291 MMC_CAP2_HS200_1_2V_SDR) 292 #define MMC_CAP2_CD_ACTIVE_HIGH (1 << 10) /* Card-detect signal active high */ 293 #define MMC_CAP2_RO_ACTIVE_HIGH (1 << 11) /* Write-protect signal active high */ 294 #define MMC_CAP2_PACKED_RD (1 << 12) /* Allow packed read */ 295 #define MMC_CAP2_PACKED_WR (1 << 13) /* Allow packed write */ 296 #define MMC_CAP2_PACKED_CMD (MMC_CAP2_PACKED_RD | \ 297 MMC_CAP2_PACKED_WR) 298 #define MMC_CAP2_NO_PRESCAN_POWERUP (1 << 14) /* Don't power up before scan */ 299 #define MMC_CAP2_HS400_1_8V (1 << 15) /* Can support HS400 1.8V */ 300 #define MMC_CAP2_HS400_1_2V (1 << 16) /* Can support HS400 1.2V */ 301 #define MMC_CAP2_HS400 (MMC_CAP2_HS400_1_8V | \ 302 MMC_CAP2_HS400_1_2V) 303 #define MMC_CAP2_HSX00_1_2V (MMC_CAP2_HS200_1_2V_SDR | MMC_CAP2_HS400_1_2V) 304 #define MMC_CAP2_SDIO_IRQ_NOTHREAD (1 << 17) 305 #define MMC_CAP2_NO_WRITE_PROTECT (1 << 18) /* No physical write protect pin, assume that card is always read-write */ 306 #define MMC_CAP2_NO_SDIO (1 << 19) /* Do not send SDIO commands during initialization */ 307 #define MMC_CAP2_HS400_ES (1 << 20) /* Host supports enhanced strobe */ 308 #define MMC_CAP2_NO_SD (1 << 21) /* Do not send SD commands during initialization */ 309 #define MMC_CAP2_NO_MMC (1 << 22) /* Do not send (e)MMC commands during initialization */ 310 311 mmc_pm_flag_t pm_caps; /* supported pm features */ 312 313 /* host specific block data */ 314 unsigned int max_seg_size; /* see blk_queue_max_segment_size */ 315 unsigned short max_segs; /* see blk_queue_max_segments */ 316 unsigned short unused; 317 unsigned int max_req_size; /* maximum number of bytes in one req */ 318 unsigned int max_blk_size; /* maximum size of one mmc block */ 319 unsigned int max_blk_count; /* maximum number of blocks in one req */ 320 unsigned int max_busy_timeout; /* max busy timeout in ms */ 321 322 /* private data */ 323 spinlock_t lock; /* lock for claim and bus ops */ 324 325 struct mmc_ios ios; /* current io bus settings */ 326 327 /* group bitfields together to minimize padding */ 328 unsigned int use_spi_crc:1; 329 unsigned int claimed:1; /* host exclusively claimed */ 330 unsigned int bus_dead:1; /* bus has been released */ 331 #ifdef CONFIG_MMC_DEBUG 332 unsigned int removed:1; /* host is being removed */ 333 #endif 334 unsigned int can_retune:1; /* re-tuning can be used */ 335 unsigned int doing_retune:1; /* re-tuning in progress */ 336 unsigned int retune_now:1; /* do re-tuning at next req */ 337 unsigned int retune_paused:1; /* re-tuning is temporarily disabled */ 338 339 int rescan_disable; /* disable card detection */ 340 int rescan_entered; /* used with nonremovable devices */ 341 342 int need_retune; /* re-tuning is needed */ 343 int hold_retune; /* hold off re-tuning */ 344 unsigned int retune_period; /* re-tuning period in secs */ 345 struct timer_list retune_timer; /* for periodic re-tuning */ 346 347 bool trigger_card_event; /* card_event necessary */ 348 349 struct mmc_card *card; /* device attached to this host */ 350 351 wait_queue_head_t wq; 352 struct task_struct *claimer; /* task that has host claimed */ 353 int claim_cnt; /* "claim" nesting count */ 354 355 struct delayed_work detect; 356 int detect_change; /* card detect flag */ 357 struct mmc_slot slot; 358 359 const struct mmc_bus_ops *bus_ops; /* current bus driver */ 360 unsigned int bus_refs; /* reference counter */ 361 362 unsigned int sdio_irqs; 363 struct task_struct *sdio_irq_thread; 364 struct delayed_work sdio_irq_work; 365 bool sdio_irq_pending; 366 atomic_t sdio_irq_thread_abort; 367 368 mmc_pm_flag_t pm_flags; /* requested pm features */ 369 370 struct led_trigger *led; /* activity led */ 371 372 #ifdef CONFIG_REGULATOR 373 bool regulator_enabled; /* regulator state */ 374 #endif 375 struct mmc_supply supply; 376 377 struct dentry *debugfs_root; 378 379 struct mmc_async_req *areq; /* active async req */ 380 struct mmc_context_info context_info; /* async synchronization info */ 381 382 /* Ongoing data transfer that allows commands during transfer */ 383 struct mmc_request *ongoing_mrq; 384 385 #ifdef CONFIG_FAIL_MMC_REQUEST 386 struct fault_attr fail_mmc_request; 387 #endif 388 389 unsigned int actual_clock; /* Actual HC clock rate */ 390 391 unsigned int slotno; /* used for sdio acpi binding */ 392 393 int dsr_req; /* DSR value is valid */ 394 u32 dsr; /* optional driver stage (DSR) value */ 395 396 unsigned long private[0] ____cacheline_aligned; 397 }; 398 399 struct device_node; 400 401 struct mmc_host *mmc_alloc_host(int extra, struct device *); 402 int mmc_add_host(struct mmc_host *); 403 void mmc_remove_host(struct mmc_host *); 404 void mmc_free_host(struct mmc_host *); 405 int mmc_of_parse(struct mmc_host *host); 406 int mmc_of_parse_voltage(struct device_node *np, u32 *mask); 407 408 static inline void *mmc_priv(struct mmc_host *host) 409 { 410 return (void *)host->private; 411 } 412 413 #define mmc_host_is_spi(host) ((host)->caps & MMC_CAP_SPI) 414 415 #define mmc_dev(x) ((x)->parent) 416 #define mmc_classdev(x) (&(x)->class_dev) 417 #define mmc_hostname(x) (dev_name(&(x)->class_dev)) 418 419 int mmc_power_save_host(struct mmc_host *host); 420 int mmc_power_restore_host(struct mmc_host *host); 421 422 void mmc_detect_change(struct mmc_host *, unsigned long delay); 423 void mmc_request_done(struct mmc_host *, struct mmc_request *); 424 void mmc_command_done(struct mmc_host *host, struct mmc_request *mrq); 425 426 static inline void mmc_signal_sdio_irq(struct mmc_host *host) 427 { 428 host->ops->enable_sdio_irq(host, 0); 429 host->sdio_irq_pending = true; 430 if (host->sdio_irq_thread) 431 wake_up_process(host->sdio_irq_thread); 432 } 433 434 void sdio_run_irqs(struct mmc_host *host); 435 void sdio_signal_irq(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 u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max); 464 int mmc_regulator_get_supply(struct mmc_host *mmc); 465 466 static inline int mmc_card_is_removable(struct mmc_host *host) 467 { 468 return !(host->caps & MMC_CAP_NONREMOVABLE); 469 } 470 471 static inline int mmc_card_keep_power(struct mmc_host *host) 472 { 473 return host->pm_flags & MMC_PM_KEEP_POWER; 474 } 475 476 static inline int mmc_card_wake_sdio_irq(struct mmc_host *host) 477 { 478 return host->pm_flags & MMC_PM_WAKE_SDIO_IRQ; 479 } 480 481 /* TODO: Move to private header */ 482 static inline int mmc_card_hs(struct mmc_card *card) 483 { 484 return card->host->ios.timing == MMC_TIMING_SD_HS || 485 card->host->ios.timing == MMC_TIMING_MMC_HS; 486 } 487 488 /* TODO: Move to private header */ 489 static inline int mmc_card_uhs(struct mmc_card *card) 490 { 491 return card->host->ios.timing >= MMC_TIMING_UHS_SDR12 && 492 card->host->ios.timing <= MMC_TIMING_UHS_DDR50; 493 } 494 495 void mmc_retune_timer_stop(struct mmc_host *host); 496 497 static inline void mmc_retune_needed(struct mmc_host *host) 498 { 499 if (host->can_retune) 500 host->need_retune = 1; 501 } 502 503 static inline bool mmc_can_retune(struct mmc_host *host) 504 { 505 return host->can_retune == 1; 506 } 507 508 static inline enum dma_data_direction mmc_get_dma_dir(struct mmc_data *data) 509 { 510 return data->flags & MMC_DATA_WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE; 511 } 512 513 int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error); 514 int mmc_abort_tuning(struct mmc_host *host, u32 opcode); 515 516 #endif /* LINUX_MMC_HOST_H */ 517