include/linux/mmc/host.h

   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/pm.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
  45         unsigned char   bus_width;              /* data bus width */
  46
  47 #define MMC_BUS_WIDTH_1         0
  48 #define MMC_BUS_WIDTH_4         2
  49 #define MMC_BUS_WIDTH_8         3
  50
  51         unsigned char   timing;                 /* timing specification used */
  52
  53 #define MMC_TIMING_LEGACY       0
  54 #define MMC_TIMING_MMC_HS       1
  55 #define MMC_TIMING_SD_HS        2
  56 #define MMC_TIMING_UHS_SDR12    3
  57 #define MMC_TIMING_UHS_SDR25    4
  58 #define MMC_TIMING_UHS_SDR50    5
  59 #define MMC_TIMING_UHS_SDR104   6
  60 #define MMC_TIMING_UHS_DDR50    7
  61 #define MMC_TIMING_MMC_DDR52    8
  62 #define MMC_TIMING_MMC_HS200    9
  63
  64 #define MMC_SDR_MODE            0
  65 #define MMC_1_2V_DDR_MODE       1
  66 #define MMC_1_8V_DDR_MODE       2
  67 #define MMC_1_2V_SDR_MODE       3
  68 #define MMC_1_8V_SDR_MODE       4
  69
  70         unsigned char   signal_voltage;         /* signalling voltage (1.8V or 3.3V) */
  71
  72 #define MMC_SIGNAL_VOLTAGE_330  0
  73 #define MMC_SIGNAL_VOLTAGE_180  1
  74 #define MMC_SIGNAL_VOLTAGE_120  2
  75
  76         unsigned char   drv_type;               /* driver type (A, B, C, D) */
  77
  78 #define MMC_SET_DRIVER_TYPE_B   0
  79 #define MMC_SET_DRIVER_TYPE_A   1
  80 #define MMC_SET_DRIVER_TYPE_C   2
  81 #define MMC_SET_DRIVER_TYPE_D   3
  82 };
  83
  84 struct mmc_host_ops {
  85         /*
  86          * 'enable' is called when the host is claimed and 'disable' is called
  87          * when the host is released. 'enable' and 'disable' are deprecated.
  88          */
  89         int (*enable)(struct mmc_host *host);
  90         int (*disable)(struct mmc_host *host);
  91         /*
  92          * It is optional for the host to implement pre_req and post_req in
  93          * order to support double buffering of requests (prepare one
  94          * request while another request is active).
  95          * pre_req() must always be followed by a post_req().
  96          * To undo a call made to pre_req(), call post_req() with
  97          * a nonzero err condition.
  98          */
  99         void    (*post_req)(struct mmc_host *host, struct mmc_request *req,
 100                             int err);
 101         void    (*pre_req)(struct mmc_host *host, struct mmc_request *req,
 102                            bool is_first_req);
 103         void    (*request)(struct mmc_host *host, struct mmc_request *req);
 104         /*
 105          * Avoid calling these three functions too often or in a "fast path",
 106          * since underlaying controller might implement them in an expensive
 107          * and/or slow way.
 108          *
 109          * Also note that these functions might sleep, so don't call them
 110          * in the atomic contexts!
 111          *
 112          * Return values for the get_ro callback should be:
 113          *   0 for a read/write card
 114          *   1 for a read-only card
 115          *   -ENOSYS when not supported (equal to NULL callback)
 116          *   or a negative errno value when something bad happened
 117          *
 118          * Return values for the get_cd callback should be:
 119          *   0 for a absent card
 120          *   1 for a present card
 121          *   -ENOSYS when not supported (equal to NULL callback)
 122          *   or a negative errno value when something bad happened
 123          */
 124         void    (*set_ios)(struct mmc_host *host, struct mmc_ios *ios);
 125         int     (*get_ro)(struct mmc_host *host);
 126         int     (*get_cd)(struct mmc_host *host);
 127
 128         void    (*enable_sdio_irq)(struct mmc_host *host, int enable);
 129
 130         /* optional callback for HC quirks */
 131         void    (*init_card)(struct mmc_host *host, struct mmc_card *card);
 132
 133         int     (*start_signal_voltage_switch)(struct mmc_host *host, struct mmc_ios *ios);
 134
 135         /* Check if the card is pulling dat[0:3] low */
 136         int     (*card_busy)(struct mmc_host *host);
 137
 138         /* The tuning command opcode value is different for SD and eMMC cards */
 139         int     (*execute_tuning)(struct mmc_host *host, u32 opcode);
 140         int     (*select_drive_strength)(unsigned int max_dtr, int host_drv, int card_drv);
 141         void    (*hw_reset)(struct mmc_host *host);
 142         void    (*card_event)(struct mmc_host *host);
 143 };
 144
 145 struct mmc_card;
 146 struct device;
 147
 148 struct mmc_async_req {
 149         /* active mmc request */
 150         struct mmc_request      *mrq;
 151         /*
 152          * Check error status of completed mmc request.
 153          * Returns 0 if success otherwise non zero.
 154          */
 155         int (*err_check) (struct mmc_card *, struct mmc_async_req *);
 156 };
 157
 158 /**
 159  * struct mmc_slot - MMC slot functions
 160  *
 161  * @cd_irq:             MMC/SD-card slot hotplug detection IRQ or -EINVAL
 162  * @lock:               protect the @handler_priv pointer
 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         struct mutex lock;
 173         void *handler_priv;
 174 };
 175
 176 /**
 177  * mmc_context_info - synchronization details for mmc context
 178  * @is_done_rcv         wake up reason was done request
 179  * @is_new_req          wake up reason was new request
 180  * @is_waiting_last_req mmc context waiting for single running request
 181  * @wait                wait queue
 182  * @lock                lock to protect data fields
 183  */
 184 struct mmc_context_info {
 185         bool                    is_done_rcv;
 186         bool                    is_new_req;
 187         bool                    is_waiting_last_req;
 188         wait_queue_head_t       wait;
 189         spinlock_t              lock;
 190 };
 191
 192 struct regulator;
 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         unsigned int            f_min;
 205         unsigned int            f_max;
 206         unsigned int            f_init;
 207         u32                     ocr_avail;
 208         u32                     ocr_avail_sdio; /* SDIO-specific OCR */
 209         u32                     ocr_avail_sd;   /* SD-specific OCR */
 210         u32                     ocr_avail_mmc;  /* MMC-specific OCR */
 211         struct notifier_block   pm_notify;
 212         u32                     max_current_330;
 213         u32                     max_current_300;
 214         u32                     max_current_180;
 215
 216 #define MMC_VDD_165_195         0x00000080      /* VDD voltage 1.65 - 1.95 */
 217 #define MMC_VDD_20_21           0x00000100      /* VDD voltage 2.0 ~ 2.1 */
 218 #define MMC_VDD_21_22           0x00000200      /* VDD voltage 2.1 ~ 2.2 */
 219 #define MMC_VDD_22_23           0x00000400      /* VDD voltage 2.2 ~ 2.3 */
 220 #define MMC_VDD_23_24           0x00000800      /* VDD voltage 2.3 ~ 2.4 */
 221 #define MMC_VDD_24_25           0x00001000      /* VDD voltage 2.4 ~ 2.5 */
 222 #define MMC_VDD_25_26           0x00002000      /* VDD voltage 2.5 ~ 2.6 */
 223 #define MMC_VDD_26_27           0x00004000      /* VDD voltage 2.6 ~ 2.7 */
 224 #define MMC_VDD_27_28           0x00008000      /* VDD voltage 2.7 ~ 2.8 */
 225 #define MMC_VDD_28_29           0x00010000      /* VDD voltage 2.8 ~ 2.9 */
 226 #define MMC_VDD_29_30           0x00020000      /* VDD voltage 2.9 ~ 3.0 */
 227 #define MMC_VDD_30_31           0x00040000      /* VDD voltage 3.0 ~ 3.1 */
 228 #define MMC_VDD_31_32           0x00080000      /* VDD voltage 3.1 ~ 3.2 */
 229 #define MMC_VDD_32_33           0x00100000      /* VDD voltage 3.2 ~ 3.3 */
 230 #define MMC_VDD_33_34           0x00200000      /* VDD voltage 3.3 ~ 3.4 */
 231 #define MMC_VDD_34_35           0x00400000      /* VDD voltage 3.4 ~ 3.5 */
 232 #define MMC_VDD_35_36           0x00800000      /* VDD voltage 3.5 ~ 3.6 */
 233
 234         u32                     caps;           /* Host capabilities */
 235
 236 #define MMC_CAP_4_BIT_DATA      (1 << 0)        /* Can the host do 4 bit transfers */
 237 #define MMC_CAP_MMC_HIGHSPEED   (1 << 1)        /* Can do MMC high-speed timing */
 238 #define MMC_CAP_SD_HIGHSPEED    (1 << 2)        /* Can do SD high-speed timing */
 239 #define MMC_CAP_SDIO_IRQ        (1 << 3)        /* Can signal pending SDIO IRQs */
 240 #define MMC_CAP_SPI             (1 << 4)        /* Talks only SPI protocols */
 241 #define MMC_CAP_NEEDS_POLL      (1 << 5)        /* Needs polling for card-detection */
 242 #define MMC_CAP_8_BIT_DATA      (1 << 6)        /* Can the host do 8 bit transfers */
 243 #define MMC_CAP_AGGRESSIVE_PM   (1 << 7)        /* Suspend (e)MMC/SD at idle  */
 244 #define MMC_CAP_NONREMOVABLE    (1 << 8)        /* Nonremovable e.g. eMMC */
 245 #define MMC_CAP_WAIT_WHILE_BUSY (1 << 9)        /* Waits while card is busy */
 246 #define MMC_CAP_ERASE           (1 << 10)       /* Allow erase/trim commands */
 247 #define MMC_CAP_1_8V_DDR        (1 << 11)       /* can support */
 248                                                 /* DDR mode at 1.8V */
 249 #define MMC_CAP_1_2V_DDR        (1 << 12)       /* can support */
 250                                                 /* DDR mode at 1.2V */
 251 #define MMC_CAP_POWER_OFF_CARD  (1 << 13)       /* Can power off after boot */
 252 #define MMC_CAP_BUS_WIDTH_TEST  (1 << 14)       /* CMD14/CMD19 bus width ok */
 253 #define MMC_CAP_UHS_SDR12       (1 << 15)       /* Host supports UHS SDR12 mode */
 254 #define MMC_CAP_UHS_SDR25       (1 << 16)       /* Host supports UHS SDR25 mode */
 255 #define MMC_CAP_UHS_SDR50       (1 << 17)       /* Host supports UHS SDR50 mode */
 256 #define MMC_CAP_UHS_SDR104      (1 << 18)       /* Host supports UHS SDR104 mode */
 257 #define MMC_CAP_UHS_DDR50       (1 << 19)       /* Host supports UHS DDR50 mode */
 258 #define MMC_CAP_RUNTIME_RESUME  (1 << 20)       /* Resume at runtime_resume. */
 259 #define MMC_CAP_DRIVER_TYPE_A   (1 << 23)       /* Host supports Driver Type A */
 260 #define MMC_CAP_DRIVER_TYPE_C   (1 << 24)       /* Host supports Driver Type C */
 261 #define MMC_CAP_DRIVER_TYPE_D   (1 << 25)       /* Host supports Driver Type D */
 262 #define MMC_CAP_CMD23           (1 << 30)       /* CMD23 supported. */
 263 #define MMC_CAP_HW_RESET        (1 << 31)       /* Hardware reset */
 264
 265         u32                     caps2;          /* More host capabilities */
 266
 267 #define MMC_CAP2_BOOTPART_NOACC (1 << 0)        /* Boot partition no access */
 268 #define MMC_CAP2_FULL_PWR_CYCLE (1 << 2)        /* Can do full power cycle */
 269 #define MMC_CAP2_NO_MULTI_READ  (1 << 3)        /* Multiblock reads don't work */
 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
 283         mmc_pm_flag_t           pm_caps;        /* supported pm features */
 284
 285 #ifdef CONFIG_MMC_CLKGATE
 286         int                     clk_requests;   /* internal reference counter */
 287         unsigned int            clk_delay;      /* number of MCI clk hold cycles */
 288         bool                    clk_gated;      /* clock gated */
 289         struct delayed_work     clk_gate_work; /* delayed clock gate */
 290         unsigned int            clk_old;        /* old clock value cache */
 291         spinlock_t              clk_lock;       /* lock for clk fields */
 292         struct mutex            clk_gate_mutex; /* mutex for clock gating */
 293         struct device_attribute clkgate_delay_attr;
 294         unsigned long           clkgate_delay;
 295 #endif
 296
 297         /* host specific block data */
 298         unsigned int            max_seg_size;   /* see blk_queue_max_segment_size */
 299         unsigned short          max_segs;       /* see blk_queue_max_segments */
 300         unsigned short          unused;
 301         unsigned int            max_req_size;   /* maximum number of bytes in one req */
 302         unsigned int            max_blk_size;   /* maximum size of one mmc block */
 303         unsigned int            max_blk_count;  /* maximum number of blocks in one req */
 304         unsigned int            max_busy_timeout; /* max busy timeout in ms */
 305
 306         /* private data */
 307         spinlock_t              lock;           /* lock for claim and bus ops */
 308
 309         struct mmc_ios          ios;            /* current io bus settings */
 310
 311         /* group bitfields together to minimize padding */
 312         unsigned int            use_spi_crc:1;
 313         unsigned int            claimed:1;      /* host exclusively claimed */
 314         unsigned int            bus_dead:1;     /* bus has been released */
 315 #ifdef CONFIG_MMC_DEBUG
 316         unsigned int            removed:1;      /* host is being removed */
 317 #endif
 318
 319         int                     rescan_disable; /* disable card detection */
 320         int                     rescan_entered; /* used with nonremovable devices */
 321
 322         bool                    trigger_card_event; /* card_event necessary */
 323
 324         struct mmc_card         *card;          /* device attached to this host */
 325
 326         wait_queue_head_t       wq;
 327         struct task_struct      *claimer;       /* task that has host claimed */
 328         int                     claim_cnt;      /* "claim" nesting count */
 329
 330         struct delayed_work     detect;
 331         int                     detect_change;  /* card detect flag */
 332         struct mmc_slot         slot;
 333
 334         const struct mmc_bus_ops *bus_ops;      /* current bus driver */
 335         unsigned int            bus_refs;       /* reference counter */
 336
 337         unsigned int            sdio_irqs;
 338         struct task_struct      *sdio_irq_thread;
 339         bool                    sdio_irq_pending;
 340         atomic_t                sdio_irq_thread_abort;
 341
 342         mmc_pm_flag_t           pm_flags;       /* requested pm features */
 343
 344         struct led_trigger      *led;           /* activity led */
 345
 346 #ifdef CONFIG_REGULATOR
 347         bool                    regulator_enabled; /* regulator state */
 348 #endif
 349         struct mmc_supply       supply;
 350
 351         struct dentry           *debugfs_root;
 352
 353         struct mmc_async_req    *areq;          /* active async req */
 354         struct mmc_context_info context_info;   /* async synchronization info */
 355
 356 #ifdef CONFIG_FAIL_MMC_REQUEST
 357         struct fault_attr       fail_mmc_request;
 358 #endif
 359
 360         unsigned int            actual_clock;   /* Actual HC clock rate */
 361
 362         unsigned int            slotno; /* used for sdio acpi binding */
 363
 364         unsigned long           private[0] ____cacheline_aligned;
 365 };
 366
 367 struct mmc_host *mmc_alloc_host(int extra, struct device *);
 368 int mmc_add_host(struct mmc_host *);
 369 void mmc_remove_host(struct mmc_host *);
 370 void mmc_free_host(struct mmc_host *);
 371 int mmc_of_parse(struct mmc_host *host);
 372
 373 static inline void *mmc_priv(struct mmc_host *host)
 374 {
 375         return (void *)host->private;
 376 }
 377
 378 #define mmc_host_is_spi(host)   ((host)->caps & MMC_CAP_SPI)
 379
 380 #define mmc_dev(x)      ((x)->parent)
 381 #define mmc_classdev(x) (&(x)->class_dev)
 382 #define mmc_hostname(x) (dev_name(&(x)->class_dev))
 383
 384 int mmc_power_save_host(struct mmc_host *host);
 385 int mmc_power_restore_host(struct mmc_host *host);
 386
 387 void mmc_detect_change(struct mmc_host *, unsigned long delay);
 388 void mmc_request_done(struct mmc_host *, struct mmc_request *);
 389
 390 static inline void mmc_signal_sdio_irq(struct mmc_host *host)
 391 {
 392         host->ops->enable_sdio_irq(host, 0);
 393         host->sdio_irq_pending = true;
 394         wake_up_process(host->sdio_irq_thread);
 395 }
 396
 397 #ifdef CONFIG_REGULATOR
 398 int mmc_regulator_get_ocrmask(struct regulator *supply);
 399 int mmc_regulator_set_ocr(struct mmc_host *mmc,
 400                         struct regulator *supply,
 401                         unsigned short vdd_bit);
 402 int mmc_regulator_get_supply(struct mmc_host *mmc);
 403 #else
 404 static inline int mmc_regulator_get_ocrmask(struct regulator *supply)
 405 {
 406         return 0;
 407 }
 408
 409 static inline int mmc_regulator_set_ocr(struct mmc_host *mmc,
 410                                  struct regulator *supply,
 411                                  unsigned short vdd_bit)
 412 {
 413         return 0;
 414 }
 415
 416 static inline int mmc_regulator_get_supply(struct mmc_host *mmc)
 417 {
 418         return 0;
 419 }
 420 #endif
 421
 422 int mmc_pm_notify(struct notifier_block *notify_block, unsigned long, void *);
 423
 424 static inline int mmc_card_is_removable(struct mmc_host *host)
 425 {
 426         return !(host->caps & MMC_CAP_NONREMOVABLE);
 427 }
 428
 429 static inline int mmc_card_keep_power(struct mmc_host *host)
 430 {
 431         return host->pm_flags & MMC_PM_KEEP_POWER;
 432 }
 433
 434 static inline int mmc_card_wake_sdio_irq(struct mmc_host *host)
 435 {
 436         return host->pm_flags & MMC_PM_WAKE_SDIO_IRQ;
 437 }
 438
 439 static inline int mmc_host_cmd23(struct mmc_host *host)
 440 {
 441         return host->caps & MMC_CAP_CMD23;
 442 }
 443
 444 static inline int mmc_boot_partition_access(struct mmc_host *host)
 445 {
 446         return !(host->caps2 & MMC_CAP2_BOOTPART_NOACC);
 447 }
 448
 449 static inline int mmc_host_uhs(struct mmc_host *host)
 450 {
 451         return host->caps &
 452                 (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
 453                  MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
 454                  MMC_CAP_UHS_DDR50);
 455 }
 456
 457 static inline int mmc_host_packed_wr(struct mmc_host *host)
 458 {
 459         return host->caps2 & MMC_CAP2_PACKED_WR;
 460 }
 461
 462 #ifdef CONFIG_MMC_CLKGATE
 463 void mmc_host_clk_hold(struct mmc_host *host);
 464 void mmc_host_clk_release(struct mmc_host *host);
 465 unsigned int mmc_host_clk_rate(struct mmc_host *host);
 466
 467 #else
 468 static inline void mmc_host_clk_hold(struct mmc_host *host)
 469 {
 470 }
 471
 472 static inline void mmc_host_clk_release(struct mmc_host *host)
 473 {
 474 }
 475
 476 static inline unsigned int mmc_host_clk_rate(struct mmc_host *host)
 477 {
 478         return host->ios.clock;
 479 }
 480 #endif
 481 #endif /* LINUX_MMC_HOST_H */