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    MMC_TIMING_LEGACY
  57#define MMC_TIMING_UHS_SDR25    MMC_TIMING_SD_HS
  58#define MMC_TIMING_UHS_SDR50    3
  59#define MMC_TIMING_UHS_SDR104   4
  60#define MMC_TIMING_UHS_DDR50    5
  61#define MMC_TIMING_MMC_HS200    6
  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        /* The tuning command opcode value is different for SD and eMMC cards */
 135        int     (*execute_tuning)(struct mmc_host *host, u32 opcode);
 136        void    (*enable_preset_value)(struct mmc_host *host, bool enable);
 137        int     (*select_drive_strength)(unsigned int max_dtr, int host_drv, int card_drv);
 138        void    (*hw_reset)(struct mmc_host *host);
 139};
 140
 141struct mmc_card;
 142struct device;
 143
 144struct mmc_async_req {
 145        /* active mmc request */
 146        struct mmc_request      *mrq;
 147        /*
 148         * Check error status of completed mmc request.
 149         * Returns 0 if success otherwise non zero.
 150         */
 151        int (*err_check) (struct mmc_card *, struct mmc_async_req *);
 152};
 153
 154/**
 155 * struct mmc_slot - MMC slot functions
 156 *
 157 * @cd_irq:             MMC/SD-card slot hotplug detection IRQ or -EINVAL
 158 * @lock:               protect the @handler_priv pointer
 159 * @handler_priv:       MMC/SD-card slot context
 160 *
 161 * Some MMC/SD host controllers implement slot-functions like card and
 162 * write-protect detection natively. However, a large number of controllers
 163 * leave these functions to the CPU. This struct provides a hook to attach
 164 * such slot-function drivers.
 165 */
 166struct mmc_slot {
 167        int cd_irq;
 168        struct mutex lock;
 169        void *handler_priv;
 170};
 171
 172struct regulator;
 173
 174struct mmc_supply {
 175        struct regulator *vmmc;         /* Card power supply */
 176        struct regulator *vqmmc;        /* Optional Vccq supply */
 177};
 178
 179struct mmc_host {
 180        struct device           *parent;
 181        struct device           class_dev;
 182        int                     index;
 183        const struct mmc_host_ops *ops;
 184        unsigned int            f_min;
 185        unsigned int            f_max;
 186        unsigned int            f_init;
 187        u32                     ocr_avail;
 188        u32                     ocr_avail_sdio; /* SDIO-specific OCR */
 189        u32                     ocr_avail_sd;   /* SD-specific OCR */
 190        u32                     ocr_avail_mmc;  /* MMC-specific OCR */
 191        struct notifier_block   pm_notify;
 192        u32                     max_current_330;
 193        u32                     max_current_300;
 194        u32                     max_current_180;
 195
 196#define MMC_VDD_165_195         0x00000080      /* VDD voltage 1.65 - 1.95 */
 197#define MMC_VDD_20_21           0x00000100      /* VDD voltage 2.0 ~ 2.1 */
 198#define MMC_VDD_21_22           0x00000200      /* VDD voltage 2.1 ~ 2.2 */
 199#define MMC_VDD_22_23           0x00000400      /* VDD voltage 2.2 ~ 2.3 */
 200#define MMC_VDD_23_24           0x00000800      /* VDD voltage 2.3 ~ 2.4 */
 201#define MMC_VDD_24_25           0x00001000      /* VDD voltage 2.4 ~ 2.5 */
 202#define MMC_VDD_25_26           0x00002000      /* VDD voltage 2.5 ~ 2.6 */
 203#define MMC_VDD_26_27           0x00004000      /* VDD voltage 2.6 ~ 2.7 */
 204#define MMC_VDD_27_28           0x00008000      /* VDD voltage 2.7 ~ 2.8 */
 205#define MMC_VDD_28_29           0x00010000      /* VDD voltage 2.8 ~ 2.9 */
 206#define MMC_VDD_29_30           0x00020000      /* VDD voltage 2.9 ~ 3.0 */
 207#define MMC_VDD_30_31           0x00040000      /* VDD voltage 3.0 ~ 3.1 */
 208#define MMC_VDD_31_32           0x00080000      /* VDD voltage 3.1 ~ 3.2 */
 209#define MMC_VDD_32_33           0x00100000      /* VDD voltage 3.2 ~ 3.3 */
 210#define MMC_VDD_33_34           0x00200000      /* VDD voltage 3.3 ~ 3.4 */
 211#define MMC_VDD_34_35           0x00400000      /* VDD voltage 3.4 ~ 3.5 */
 212#define MMC_VDD_35_36           0x00800000      /* VDD voltage 3.5 ~ 3.6 */
 213
 214        unsigned long           caps;           /* Host capabilities */
 215
 216#define MMC_CAP_4_BIT_DATA      (1 << 0)        /* Can the host do 4 bit transfers */
 217#define MMC_CAP_MMC_HIGHSPEED   (1 << 1)        /* Can do MMC high-speed timing */
 218#define MMC_CAP_SD_HIGHSPEED    (1 << 2)        /* Can do SD high-speed timing */
 219#define MMC_CAP_SDIO_IRQ        (1 << 3)        /* Can signal pending SDIO IRQs */
 220#define MMC_CAP_SPI             (1 << 4)        /* Talks only SPI protocols */
 221#define MMC_CAP_NEEDS_POLL      (1 << 5)        /* Needs polling for card-detection */
 222#define MMC_CAP_8_BIT_DATA      (1 << 6)        /* Can the host do 8 bit transfers */
 223
 224#define MMC_CAP_NONREMOVABLE    (1 << 8)        /* Nonremovable e.g. eMMC */
 225#define MMC_CAP_WAIT_WHILE_BUSY (1 << 9)        /* Waits while card is busy */
 226#define MMC_CAP_ERASE           (1 << 10)       /* Allow erase/trim commands */
 227#define MMC_CAP_1_8V_DDR        (1 << 11)       /* can support */
 228                                                /* DDR mode at 1.8V */
 229#define MMC_CAP_1_2V_DDR        (1 << 12)       /* can support */
 230                                                /* DDR mode at 1.2V */
 231#define MMC_CAP_POWER_OFF_CARD  (1 << 13)       /* Can power off after boot */
 232#define MMC_CAP_BUS_WIDTH_TEST  (1 << 14)       /* CMD14/CMD19 bus width ok */
 233#define MMC_CAP_UHS_SDR12       (1 << 15)       /* Host supports UHS SDR12 mode */
 234#define MMC_CAP_UHS_SDR25       (1 << 16)       /* Host supports UHS SDR25 mode */
 235#define MMC_CAP_UHS_SDR50       (1 << 17)       /* Host supports UHS SDR50 mode */
 236#define MMC_CAP_UHS_SDR104      (1 << 18)       /* Host supports UHS SDR104 mode */
 237#define MMC_CAP_UHS_DDR50       (1 << 19)       /* Host supports UHS DDR50 mode */
 238#define MMC_CAP_DRIVER_TYPE_A   (1 << 23)       /* Host supports Driver Type A */
 239#define MMC_CAP_DRIVER_TYPE_C   (1 << 24)       /* Host supports Driver Type C */
 240#define MMC_CAP_DRIVER_TYPE_D   (1 << 25)       /* Host supports Driver Type D */
 241#define MMC_CAP_CMD23           (1 << 30)       /* CMD23 supported. */
 242#define MMC_CAP_HW_RESET        (1 << 31)       /* Hardware reset */
 243
 244        unsigned int            caps2;          /* More host capabilities */
 245
 246#define MMC_CAP2_BOOTPART_NOACC (1 << 0)        /* Boot partition no access */
 247#define MMC_CAP2_CACHE_CTRL     (1 << 1)        /* Allow cache control */
 248#define MMC_CAP2_POWEROFF_NOTIFY (1 << 2)       /* Notify poweroff supported */
 249#define MMC_CAP2_NO_MULTI_READ  (1 << 3)        /* Multiblock reads don't work */
 250#define MMC_CAP2_NO_SLEEP_CMD   (1 << 4)        /* Don't allow sleep command */
 251#define MMC_CAP2_HS200_1_8V_SDR (1 << 5)        /* can support */
 252#define MMC_CAP2_HS200_1_2V_SDR (1 << 6)        /* can support */
 253#define MMC_CAP2_HS200          (MMC_CAP2_HS200_1_8V_SDR | \
 254                                 MMC_CAP2_HS200_1_2V_SDR)
 255#define MMC_CAP2_BROKEN_VOLTAGE (1 << 7)        /* Use the broken voltage */
 256#define MMC_CAP2_DETECT_ON_ERR  (1 << 8)        /* On I/O err check card removal */
 257#define MMC_CAP2_HC_ERASE_SZ    (1 << 9)        /* High-capacity erase size */
 258#define MMC_CAP2_CD_ACTIVE_HIGH (1 << 10)       /* Card-detect signal active high */
 259#define MMC_CAP2_RO_ACTIVE_HIGH (1 << 11)       /* Write-protect signal active high */
 260
 261        mmc_pm_flag_t           pm_caps;        /* supported pm features */
 262        unsigned int        power_notify_type;
 263#define MMC_HOST_PW_NOTIFY_NONE         0
 264#define MMC_HOST_PW_NOTIFY_SHORT        1
 265#define MMC_HOST_PW_NOTIFY_LONG         2
 266
 267#ifdef CONFIG_MMC_CLKGATE
 268        int                     clk_requests;   /* internal reference counter */
 269        unsigned int            clk_delay;      /* number of MCI clk hold cycles */
 270        bool                    clk_gated;      /* clock gated */
 271        struct delayed_work     clk_gate_work; /* delayed clock gate */
 272        unsigned int            clk_old;        /* old clock value cache */
 273        spinlock_t              clk_lock;       /* lock for clk fields */
 274        struct mutex            clk_gate_mutex; /* mutex for clock gating */
 275        struct device_attribute clkgate_delay_attr;
 276        unsigned long           clkgate_delay;
 277#endif
 278
 279        /* host specific block data */
 280        unsigned int            max_seg_size;   /* see blk_queue_max_segment_size */
 281        unsigned short          max_segs;       /* see blk_queue_max_segments */
 282        unsigned short          unused;
 283        unsigned int            max_req_size;   /* maximum number of bytes in one req */
 284        unsigned int            max_blk_size;   /* maximum size of one mmc block */
 285        unsigned int            max_blk_count;  /* maximum number of blocks in one req */
 286        unsigned int            max_discard_to; /* max. discard timeout in ms */
 287
 288        /* private data */
 289        spinlock_t              lock;           /* lock for claim and bus ops */
 290
 291        struct mmc_ios          ios;            /* current io bus settings */
 292        u32                     ocr;            /* the current OCR setting */
 293
 294        /* group bitfields together to minimize padding */
 295        unsigned int            use_spi_crc:1;
 296        unsigned int            claimed:1;      /* host exclusively claimed */
 297        unsigned int            bus_dead:1;     /* bus has been released */
 298#ifdef CONFIG_MMC_DEBUG
 299        unsigned int            removed:1;      /* host is being removed */
 300#endif
 301
 302        int                     rescan_disable; /* disable card detection */
 303
 304        struct mmc_card         *card;          /* device attached to this host */
 305
 306        wait_queue_head_t       wq;
 307        struct task_struct      *claimer;       /* task that has host claimed */
 308        int                     claim_cnt;      /* "claim" nesting count */
 309
 310        struct delayed_work     detect;
 311        int                     detect_change;  /* card detect flag */
 312        struct mmc_slot         slot;
 313
 314        const struct mmc_bus_ops *bus_ops;      /* current bus driver */
 315        unsigned int            bus_refs;       /* reference counter */
 316
 317        unsigned int            sdio_irqs;
 318        struct task_struct      *sdio_irq_thread;
 319        bool                    sdio_irq_pending;
 320        atomic_t                sdio_irq_thread_abort;
 321
 322        mmc_pm_flag_t           pm_flags;       /* requested pm features */
 323
 324#ifdef CONFIG_LEDS_TRIGGERS
 325        struct led_trigger      *led;           /* activity led */
 326#endif
 327
 328#ifdef CONFIG_REGULATOR
 329        bool                    regulator_enabled; /* regulator state */
 330#endif
 331        struct mmc_supply       supply;
 332
 333        struct dentry           *debugfs_root;
 334
 335        struct mmc_async_req    *areq;          /* active async req */
 336
 337#ifdef CONFIG_FAIL_MMC_REQUEST
 338        struct fault_attr       fail_mmc_request;
 339#endif
 340
 341        unsigned int            actual_clock;   /* Actual HC clock rate */
 342
 343        unsigned long           private[0] ____cacheline_aligned;
 344};
 345
 346extern struct mmc_host *mmc_alloc_host(int extra, struct device *);
 347extern int mmc_add_host(struct mmc_host *);
 348extern void mmc_remove_host(struct mmc_host *);
 349extern void mmc_free_host(struct mmc_host *);
 350
 351static inline void *mmc_priv(struct mmc_host *host)
 352{
 353        return (void *)host->private;
 354}
 355
 356#define mmc_host_is_spi(host)   ((host)->caps & MMC_CAP_SPI)
 357
 358#define mmc_dev(x)      ((x)->parent)
 359#define mmc_classdev(x) (&(x)->class_dev)
 360#define mmc_hostname(x) (dev_name(&(x)->class_dev))
 361
 362extern int mmc_suspend_host(struct mmc_host *);
 363extern int mmc_resume_host(struct mmc_host *);
 364
 365extern int mmc_power_save_host(struct mmc_host *host);
 366extern int mmc_power_restore_host(struct mmc_host *host);
 367
 368extern void mmc_detect_change(struct mmc_host *, unsigned long delay);
 369extern void mmc_request_done(struct mmc_host *, struct mmc_request *);
 370
 371extern int mmc_cache_ctrl(struct mmc_host *, u8);
 372
 373static inline void mmc_signal_sdio_irq(struct mmc_host *host)
 374{
 375        host->ops->enable_sdio_irq(host, 0);
 376        host->sdio_irq_pending = true;
 377        wake_up_process(host->sdio_irq_thread);
 378}
 379
 380#ifdef CONFIG_REGULATOR
 381int mmc_regulator_get_ocrmask(struct regulator *supply);
 382int mmc_regulator_set_ocr(struct mmc_host *mmc,
 383                        struct regulator *supply,
 384                        unsigned short vdd_bit);
 385int mmc_regulator_get_supply(struct mmc_host *mmc);
 386#else
 387static inline int mmc_regulator_get_ocrmask(struct regulator *supply)
 388{
 389        return 0;
 390}
 391
 392static inline int mmc_regulator_set_ocr(struct mmc_host *mmc,
 393                                 struct regulator *supply,
 394                                 unsigned short vdd_bit)
 395{
 396        return 0;
 397}
 398
 399static inline int mmc_regulator_get_supply(struct mmc_host *mmc)
 400{
 401        return 0;
 402}
 403#endif
 404
 405int mmc_card_awake(struct mmc_host *host);
 406int mmc_card_sleep(struct mmc_host *host);
 407int mmc_card_can_sleep(struct mmc_host *host);
 408
 409int mmc_pm_notify(struct notifier_block *notify_block, unsigned long, void *);
 410
 411/* Module parameter */
 412extern bool mmc_assume_removable;
 413
 414static inline int mmc_card_is_removable(struct mmc_host *host)
 415{
 416        return !(host->caps & MMC_CAP_NONREMOVABLE) && mmc_assume_removable;
 417}
 418
 419static inline int mmc_card_keep_power(struct mmc_host *host)
 420{
 421        return host->pm_flags & MMC_PM_KEEP_POWER;
 422}
 423
 424static inline int mmc_card_wake_sdio_irq(struct mmc_host *host)
 425{
 426        return host->pm_flags & MMC_PM_WAKE_SDIO_IRQ;
 427}
 428
 429static inline int mmc_host_cmd23(struct mmc_host *host)
 430{
 431        return host->caps & MMC_CAP_CMD23;
 432}
 433
 434static inline int mmc_boot_partition_access(struct mmc_host *host)
 435{
 436        return !(host->caps2 & MMC_CAP2_BOOTPART_NOACC);
 437}
 438
 439#ifdef CONFIG_MMC_CLKGATE
 440void mmc_host_clk_hold(struct mmc_host *host);
 441void mmc_host_clk_release(struct mmc_host *host);
 442unsigned int mmc_host_clk_rate(struct mmc_host *host);
 443
 444#else
 445static inline void mmc_host_clk_hold(struct mmc_host *host)
 446{
 447}
 448
 449static inline void mmc_host_clk_release(struct mmc_host *host)
 450{
 451}
 452
 453static inline unsigned int mmc_host_clk_rate(struct mmc_host *host)
 454{
 455        return host->ios.clock;
 456}
 457#endif
 458#endif /* LINUX_MMC_HOST_H */
 459