LXR linux/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
  22struct 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_HS200    8
  62
  63#define MMC_SDR_MODE            0
  64#define MMC_1_2V_DDR_MODE       1
  65#define MMC_1_8V_DDR_MODE       2
  66#define MMC_1_2V_SDR_MODE       3
  67#define MMC_1_8V_SDR_MODE       4
  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
  83struct mmc_host_ops {
  84        /*
  85         * 'enable' is called when the host is claimed and 'disable' is called
  86         * when the host is released. 'enable' and 'disable' are deprecated.
  87         */
  88        int (*enable)(struct mmc_host *host);
  89        int (*disable)(struct mmc_host *host);
  90        /*
  91         * It is optional for the host to implement pre_req and post_req in
  92         * order to support double buffering of requests (prepare one
  93         * request while another request is active).
  94         * pre_req() must always be followed by a post_req().
  95         * To undo a call made to pre_req(), call post_req() with
  96         * a nonzero err condition.
  97         */
  98        void    (*post_req)(struct mmc_host *host, struct mmc_request *req,
  99                            int err);
 100        void    (*pre_req)(struct mmc_host *host, struct mmc_request *req,
 101                           bool is_first_req);
 102        void    (*request)(struct mmc_host *host, struct mmc_request *req);
 103        /*
 104         * Avoid calling these three functions too often or in a "fast path",
 105         * since underlaying controller might implement them in an expensive
 106         * and/or slow way.
 107         *
 108         * Also note that these functions might sleep, so don't call them
 109         * in the atomic contexts!
 110         *
 111         * Return values for the get_ro callback should be:
 112         *   0 for a read/write card
 113         *   1 for a read-only card
 114         *   -ENOSYS when not supported (equal to NULL callback)
 115         *   or a negative errno value when something bad happened
 116         *
 117         * Return values for the get_cd callback should be:
 118         *   0 for a absent card
 119         *   1 for a present card
 120         *   -ENOSYS when not supported (equal to NULL callback)
 121         *   or a negative errno value when something bad happened
 122         */
 123        void    (*set_ios)(struct mmc_host *host, struct mmc_ios *ios);
 124        int     (*get_ro)(struct mmc_host *host);
 125        int     (*get_cd)(struct mmc_host *host);
 126
 127        void    (*enable_sdio_irq)(struct mmc_host *host, int enable);
 128
 129        /* optional callback for HC quirks */
 130        void    (*init_card)(struct mmc_host *host, struct mmc_card *card);
 131
 132        int     (*start_signal_voltage_switch)(struct mmc_host *host, struct mmc_ios *ios);
 133
 134        /* Check if the card is pulling dat[0:3] low */
 135        int     (*card_busy)(struct mmc_host *host);
 136
 137        /* The tuning command opcode value is different for SD and eMMC cards */
 138        int     (*execute_tuning)(struct mmc_host *host, u32 opcode);
 139        int     (*select_drive_strength)(unsigned int max_dtr, int host_drv, int card_drv);
 140        void    (*hw_reset)(struct mmc_host *host);
 141        void    (*card_event)(struct mmc_host *host);
 142};
 143
 144struct mmc_card;
 145struct device;
 146
 147struct mmc_async_req {
 148        /* active mmc request */
 149        struct mmc_request      *mrq;
 150        /*
 151         * Check error status of completed mmc request.
 152         * Returns 0 if success otherwise non zero.
 153         */
 154        int (*err_check) (struct mmc_card *, struct mmc_async_req *);
 155};
 156
 157/**
 158 * struct mmc_slot - MMC slot functions
 159 *
 160 * @cd_irq:             MMC/SD-card slot hotplug detection IRQ or -EINVAL
 161 * @lock:               protect the @handler_priv pointer
 162 * @handler_priv:       MMC/SD-card slot context
 163 *
 164 * Some MMC/SD host controllers implement slot-functions like card and
 165 * write-protect detection natively. However, a large number of controllers
 166 * leave these functions to the CPU. This struct provides a hook to attach
 167 * such slot-function drivers.
 168 */
 169struct mmc_slot {
 170        int cd_irq;
 171        struct mutex lock;
 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 */
 183struct 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
 191struct regulator;
 192
 193struct mmc_supply {
 194        struct regulator *vmmc;         /* Card power supply */
 195        struct regulator *vqmmc;        /* Optional Vccq supply */
 196};
 197
 198struct mmc_host {
 199        struct device           *parent;
 200        struct device           class_dev;
 201        int                     index;
 202        const struct mmc_host_ops *ops;
 203        unsigned int            f_min;
 204        unsigned int            f_max;
 205        unsigned int            f_init;
 206        u32                     ocr_avail;
 207        u32                     ocr_avail_sdio; /* SDIO-specific OCR */
 208        u32                     ocr_avail_sd;   /* SD-specific OCR */
 209        u32                     ocr_avail_mmc;  /* MMC-specific OCR */
 210        struct notifier_block   pm_notify;
 211        u32                     max_current_330;
 212        u32                     max_current_300;
 213        u32                     max_current_180;
 214
 215#define MMC_VDD_165_195         0x00000080      /* VDD voltage 1.65 - 1.95 */
 216#define MMC_VDD_20_21           0x00000100      /* VDD voltage 2.0 ~ 2.1 */
 217#define MMC_VDD_21_22           0x00000200      /* VDD voltage 2.1 ~ 2.2 */
 218#define MMC_VDD_22_23           0x00000400      /* VDD voltage 2.2 ~ 2.3 */
 219#define MMC_VDD_23_24           0x00000800      /* VDD voltage 2.3 ~ 2.4 */
 220#define MMC_VDD_24_25           0x00001000      /* VDD voltage 2.4 ~ 2.5 */
 221#define MMC_VDD_25_26           0x00002000      /* VDD voltage 2.5 ~ 2.6 */
 222#define MMC_VDD_26_27           0x00004000      /* VDD voltage 2.6 ~ 2.7 */
 223#define MMC_VDD_27_28           0x00008000      /* VDD voltage 2.7 ~ 2.8 */
 224#define MMC_VDD_28_29           0x00010000      /* VDD voltage 2.8 ~ 2.9 */
 225#define MMC_VDD_29_30           0x00020000      /* VDD voltage 2.9 ~ 3.0 */
 226#define MMC_VDD_30_31           0x00040000      /* VDD voltage 3.0 ~ 3.1 */
 227#define MMC_VDD_31_32           0x00080000      /* VDD voltage 3.1 ~ 3.2 */
 228#define MMC_VDD_32_33           0x00100000      /* VDD voltage 3.2 ~ 3.3 */
 229#define MMC_VDD_33_34           0x00200000      /* VDD voltage 3.3 ~ 3.4 */
 230#define MMC_VDD_34_35           0x00400000      /* VDD voltage 3.4 ~ 3.5 */
 231#define MMC_VDD_35_36           0x00800000      /* VDD voltage 3.5 ~ 3.6 */
 232
 233        u32                     caps;           /* Host capabilities */
 234
 235#define MMC_CAP_4_BIT_DATA      (1 << 0)        /* Can the host do 4 bit transfers */
 236#define MMC_CAP_MMC_HIGHSPEED   (1 << 1)        /* Can do MMC high-speed timing */
 237#define MMC_CAP_SD_HIGHSPEED    (1 << 2)        /* Can do SD high-speed timing */
 238#define MMC_CAP_SDIO_IRQ        (1 << 3)        /* Can signal pending SDIO IRQs */
 239#define MMC_CAP_SPI             (1 << 4)        /* Talks only SPI protocols */
 240#define MMC_CAP_NEEDS_POLL      (1 << 5)        /* Needs polling for card-detection */
 241#define MMC_CAP_8_BIT_DATA      (1 << 6)        /* Can the host do 8 bit transfers */
 242#define MMC_CAP_AGGRESSIVE_PM   (1 << 7)        /* Suspend (e)MMC/SD at idle  */
 243#define MMC_CAP_NONREMOVABLE    (1 << 8)        /* Nonremovable e.g. eMMC */
 244#define MMC_CAP_WAIT_WHILE_BUSY (1 << 9)        /* Waits while card is busy */
 245#define MMC_CAP_ERASE           (1 << 10)       /* Allow erase/trim commands */
 246#define MMC_CAP_1_8V_DDR        (1 << 11)       /* can support */
 247                                                /* DDR mode at 1.8V */
 248#define MMC_CAP_1_2V_DDR        (1 << 12)       /* can support */
 249                                                /* DDR mode at 1.2V */
 250#define MMC_CAP_POWER_OFF_CARD  (1 << 13)       /* Can power off after boot */
 251#define MMC_CAP_BUS_WIDTH_TEST  (1 << 14)       /* CMD14/CMD19 bus width ok */
 252#define MMC_CAP_UHS_SDR12       (1 << 15)       /* Host supports UHS SDR12 mode */
 253#define MMC_CAP_UHS_SDR25       (1 << 16)       /* Host supports UHS SDR25 mode */
 254#define MMC_CAP_UHS_SDR50       (1 << 17)       /* Host supports UHS SDR50 mode */
 255#define MMC_CAP_UHS_SDR104      (1 << 18)       /* Host supports UHS SDR104 mode */
 256#define MMC_CAP_UHS_DDR50       (1 << 19)       /* Host supports UHS DDR50 mode */
 257#define MMC_CAP_DRIVER_TYPE_A   (1 << 23)       /* Host supports Driver Type A */
 258#define MMC_CAP_DRIVER_TYPE_C   (1 << 24)       /* Host supports Driver Type C */
 259#define MMC_CAP_DRIVER_TYPE_D   (1 << 25)       /* Host supports Driver Type D */
 260#define MMC_CAP_CMD23           (1 << 30)       /* CMD23 supported. */
 261#define MMC_CAP_HW_RESET        (1 << 31)       /* Hardware reset */
 262
 263        u32                     caps2;          /* More host capabilities */
 264
 265#define MMC_CAP2_BOOTPART_NOACC (1 << 0)        /* Boot partition no access */
 266#define MMC_CAP2_CACHE_CTRL     (1 << 1)        /* Allow cache control */
 267#define MMC_CAP2_FULL_PWR_CYCLE (1 << 2)        /* Can do full power cycle */
 268#define MMC_CAP2_NO_MULTI_READ  (1 << 3)        /* Multiblock reads don't work */
 269#define MMC_CAP2_NO_SLEEP_CMD   (1 << 4)        /* Don't allow sleep command */
 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_BROKEN_VOLTAGE (1 << 7)        /* Use the broken voltage */
 275#define MMC_CAP2_HC_ERASE_SZ    (1 << 9)        /* High-capacity erase size */
 276#define MMC_CAP2_CD_ACTIVE_HIGH (1 << 10)       /* Card-detect signal active high */
 277#define MMC_CAP2_RO_ACTIVE_HIGH (1 << 11)       /* Write-protect signal active high */
 278#define MMC_CAP2_PACKED_RD      (1 << 12)       /* Allow packed read */
 279#define MMC_CAP2_PACKED_WR      (1 << 13)       /* Allow packed write */
 280#define MMC_CAP2_PACKED_CMD     (MMC_CAP2_PACKED_RD | \
 281                                 MMC_CAP2_PACKED_WR)
 282#define MMC_CAP2_NO_PRESCAN_POWERUP (1 << 14)   /* Don't power up before scan */
 283#define MMC_CAP2_SANITIZE       (1 << 15)               /* Support Sanitize */
 284
 285        mmc_pm_flag_t           pm_caps;        /* supported pm features */
 286
 287#ifdef CONFIG_MMC_CLKGATE
 288        int                     clk_requests;   /* internal reference counter */
 289        unsigned int            clk_delay;      /* number of MCI clk hold cycles */
 290        bool                    clk_gated;      /* clock gated */
 291        struct delayed_work     clk_gate_work; /* delayed clock gate */
 292        unsigned int            clk_old;        /* old clock value cache */
 293        spinlock_t              clk_lock;       /* lock for clk fields */
 294        struct mutex            clk_gate_mutex; /* mutex for clock gating */
 295        struct device_attribute clkgate_delay_attr;
 296        unsigned long           clkgate_delay;
 297#endif
 298
 299        /* host specific block data */
 300        unsigned int            max_seg_size;   /* see blk_queue_max_segment_size */
 301        unsigned short          max_segs;       /* see blk_queue_max_segments */
 302        unsigned short          unused;
 303        unsigned int            max_req_size;   /* maximum number of bytes in one req */
 304        unsigned int            max_blk_size;   /* maximum size of one mmc block */
 305        unsigned int            max_blk_count;  /* maximum number of blocks in one req */
 306        unsigned int            max_discard_to; /* max. discard timeout in ms */
 307
 308        /* private data */
 309        spinlock_t              lock;           /* lock for claim and bus ops */
 310
 311        struct mmc_ios          ios;            /* current io bus settings */
 312        u32                     ocr;            /* the current OCR setting */
 313
 314        /* group bitfields together to minimize padding */
 315        unsigned int            use_spi_crc:1;
 316        unsigned int            claimed:1;      /* host exclusively claimed */
 317        unsigned int            bus_dead:1;     /* bus has been released */
 318#ifdef CONFIG_MMC_DEBUG
 319        unsigned int            removed:1;      /* host is being removed */
 320#endif
 321
 322        int                     rescan_disable; /* disable card detection */
 323        int                     rescan_entered; /* used with nonremovable devices */
 324
 325        struct mmc_card         *card;          /* device attached to this host */
 326
 327        wait_queue_head_t       wq;
 328        struct task_struct      *claimer;       /* task that has host claimed */
 329        int                     claim_cnt;      /* "claim" nesting count */
 330
 331        struct delayed_work     detect;
 332        int                     detect_change;  /* card detect flag */
 333        struct mmc_slot         slot;
 334
 335        const struct mmc_bus_ops *bus_ops;      /* current bus driver */
 336        unsigned int            bus_refs;       /* reference counter */
 337
 338        unsigned int            sdio_irqs;
 339        struct task_struct      *sdio_irq_thread;
 340        bool                    sdio_irq_pending;
 341        atomic_t                sdio_irq_thread_abort;
 342
 343        mmc_pm_flag_t           pm_flags;       /* requested pm features */
 344
 345        struct led_trigger      *led;           /* activity led */
 346
 347#ifdef CONFIG_REGULATOR
 348        bool                    regulator_enabled; /* regulator state */
 349#endif
 350        struct mmc_supply       supply;
 351
 352        struct dentry           *debugfs_root;
 353
 354        struct mmc_async_req    *areq;          /* active async req */
 355        struct mmc_context_info context_info;   /* async synchronization info */
 356
 357#ifdef CONFIG_FAIL_MMC_REQUEST
 358        struct fault_attr       fail_mmc_request;
 359#endif
 360
 361        unsigned int            actual_clock;   /* Actual HC clock rate */
 362
 363        unsigned int            slotno; /* used for sdio acpi binding */
 364
 365        unsigned long           private[0] ____cacheline_aligned;
 366};
 367
 368struct mmc_host *mmc_alloc_host(int extra, struct device *);
 369int mmc_add_host(struct mmc_host *);
 370void mmc_remove_host(struct mmc_host *);
 371void mmc_free_host(struct mmc_host *);
 372int mmc_of_parse(struct mmc_host *host);
 373
 374static inline void *mmc_priv(struct mmc_host *host)
 375{
 376        return (void *)host->private;
 377}
 378
 379#define mmc_host_is_spi(host)   ((host)->caps & MMC_CAP_SPI)
 380
 381#define mmc_dev(x)      ((x)->parent)
 382#define mmc_classdev(x) (&(x)->class_dev)
 383#define mmc_hostname(x) (dev_name(&(x)->class_dev))
 384
 385int mmc_suspend_host(struct mmc_host *);
 386int mmc_resume_host(struct mmc_host *);
 387
 388int mmc_power_save_host(struct mmc_host *host);
 389int mmc_power_restore_host(struct mmc_host *host);
 390
 391void mmc_detect_change(struct mmc_host *, unsigned long delay);
 392void mmc_request_done(struct mmc_host *, struct mmc_request *);
 393
 394int mmc_cache_ctrl(struct mmc_host *, u8);
 395
 396static inline void mmc_signal_sdio_irq(struct mmc_host *host)
 397{
 398        host->ops->enable_sdio_irq(host, 0);
 399        host->sdio_irq_pending = true;
 400        wake_up_process(host->sdio_irq_thread);
 401}
 402
 403#ifdef CONFIG_REGULATOR
 404int mmc_regulator_get_ocrmask(struct regulator *supply);
 405int mmc_regulator_set_ocr(struct mmc_host *mmc,
 406                        struct regulator *supply,
 407                        unsigned short vdd_bit);
 408int mmc_regulator_get_supply(struct mmc_host *mmc);
 409#else
 410static inline int mmc_regulator_get_ocrmask(struct regulator *supply)
 411{
 412        return 0;
 413}
 414
 415static inline int mmc_regulator_set_ocr(struct mmc_host *mmc,
 416                                 struct regulator *supply,
 417                                 unsigned short vdd_bit)
 418{
 419        return 0;
 420}
 421
 422static inline int mmc_regulator_get_supply(struct mmc_host *mmc)
 423{
 424        return 0;
 425}
 426#endif
 427
 428int mmc_pm_notify(struct notifier_block *notify_block, unsigned long, void *);
 429
 430/* Module parameter */
 431extern bool mmc_assume_removable;
 432
 433static inline int mmc_card_is_removable(struct mmc_host *host)
 434{
 435        return !(host->caps & MMC_CAP_NONREMOVABLE) && mmc_assume_removable;
 436}
 437
 438static inline int mmc_card_keep_power(struct mmc_host *host)
 439{
 440        return host->pm_flags & MMC_PM_KEEP_POWER;
 441}
 442
 443static inline int mmc_card_wake_sdio_irq(struct mmc_host *host)
 444{
 445        return host->pm_flags & MMC_PM_WAKE_SDIO_IRQ;
 446}
 447
 448static inline int mmc_host_cmd23(struct mmc_host *host)
 449{
 450        return host->caps & MMC_CAP_CMD23;
 451}
 452
 453static inline int mmc_boot_partition_access(struct mmc_host *host)
 454{
 455        return !(host->caps2 & MMC_CAP2_BOOTPART_NOACC);
 456}
 457
 458static inline int mmc_host_uhs(struct mmc_host *host)
 459{
 460        return host->caps &
 461                (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
 462                 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
 463                 MMC_CAP_UHS_DDR50);
 464}
 465
 466static inline int mmc_host_packed_wr(struct mmc_host *host)
 467{
 468        return host->caps2 & MMC_CAP2_PACKED_WR;
 469}
 470
 471#ifdef CONFIG_MMC_CLKGATE
 472void mmc_host_clk_hold(struct mmc_host *host);
 473void mmc_host_clk_release(struct mmc_host *host);
 474unsigned int mmc_host_clk_rate(struct mmc_host *host);
 475
 476#else
 477static inline void mmc_host_clk_hold(struct mmc_host *host)
 478{
 479}
 480
 481static inline void mmc_host_clk_release(struct mmc_host *host)
 482{
 483}
 484
 485static inline unsigned int mmc_host_clk_rate(struct mmc_host *host)
 486{
 487        return host->ios.clock;
 488}
 489#endif
 490#endif /* LINUX_MMC_HOST_H */
 491