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