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root/include/linux/mmc/host.h

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DEFINITIONS

This source file includes following definitions.
  1. mmc_priv
  2. mmc_signal_sdio_irq

/*
 *  linux/include/linux/mmc/host.h
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  Host driver specific definitions.
 */
#ifndef LINUX_MMC_HOST_H
#define LINUX_MMC_HOST_H

#include <linux/leds.h>

#include <linux/mmc/core.h>

struct mmc_ios {
        unsigned int    clock;                  /* clock rate */
        unsigned short  vdd;

/* vdd stores the bit number of the selected voltage range from below. */

        unsigned char   bus_mode;               /* command output mode */

#define MMC_BUSMODE_OPENDRAIN   1
#define MMC_BUSMODE_PUSHPULL    2

        unsigned char   chip_select;            /* SPI chip select */

#define MMC_CS_DONTCARE         0
#define MMC_CS_HIGH             1
#define MMC_CS_LOW              2

        unsigned char   power_mode;             /* power supply mode */

#define MMC_POWER_OFF           0
#define MMC_POWER_UP            1
#define MMC_POWER_ON            2

        unsigned char   bus_width;              /* data bus width */

#define MMC_BUS_WIDTH_1         0
#define MMC_BUS_WIDTH_4         2

        unsigned char   timing;                 /* timing specification used */

#define MMC_TIMING_LEGACY       0
#define MMC_TIMING_MMC_HS       1
#define MMC_TIMING_SD_HS        2
};

struct mmc_host_ops {
        void    (*request)(struct mmc_host *host, struct mmc_request *req);
        /*
         * Avoid calling these three functions too often or in a "fast path",
         * since underlaying controller might implement them in an expensive
         * and/or slow way.
         *
         * Also note that these functions might sleep, so don't call them
         * in the atomic contexts!
         *
         * Return values for the get_ro callback should be:
         *   0 for a read/write card
         *   1 for a read-only card
         *   -ENOSYS when not supported (equal to NULL callback)
         *   or a negative errno value when something bad happened
         *
         * Return values for the get_cd callback should be:
         *   0 for a absent card
         *   1 for a present card
         *   -ENOSYS when not supported (equal to NULL callback)
         *   or a negative errno value when something bad happened
         */
        void    (*set_ios)(struct mmc_host *host, struct mmc_ios *ios);
        int     (*get_ro)(struct mmc_host *host);
        int     (*get_cd)(struct mmc_host *host);

        void    (*enable_sdio_irq)(struct mmc_host *host, int enable);
};

struct mmc_card;
struct device;

struct mmc_host {
        struct device           *parent;
        struct device           class_dev;
        int                     index;
        const struct mmc_host_ops *ops;
        unsigned int            f_min;
        unsigned int            f_max;
        u32                     ocr_avail;

#define MMC_VDD_165_195         0x00000080      /* VDD voltage 1.65 - 1.95 */
#define MMC_VDD_20_21           0x00000100      /* VDD voltage 2.0 ~ 2.1 */
#define MMC_VDD_21_22           0x00000200      /* VDD voltage 2.1 ~ 2.2 */
#define MMC_VDD_22_23           0x00000400      /* VDD voltage 2.2 ~ 2.3 */
#define MMC_VDD_23_24           0x00000800      /* VDD voltage 2.3 ~ 2.4 */
#define MMC_VDD_24_25           0x00001000      /* VDD voltage 2.4 ~ 2.5 */
#define MMC_VDD_25_26           0x00002000      /* VDD voltage 2.5 ~ 2.6 */
#define MMC_VDD_26_27           0x00004000      /* VDD voltage 2.6 ~ 2.7 */
#define MMC_VDD_27_28           0x00008000      /* VDD voltage 2.7 ~ 2.8 */
#define MMC_VDD_28_29           0x00010000      /* VDD voltage 2.8 ~ 2.9 */
#define MMC_VDD_29_30           0x00020000      /* VDD voltage 2.9 ~ 3.0 */
#define MMC_VDD_30_31           0x00040000      /* VDD voltage 3.0 ~ 3.1 */
#define MMC_VDD_31_32           0x00080000      /* VDD voltage 3.1 ~ 3.2 */
#define MMC_VDD_32_33           0x00100000      /* VDD voltage 3.2 ~ 3.3 */
#define MMC_VDD_33_34           0x00200000      /* VDD voltage 3.3 ~ 3.4 */
#define MMC_VDD_34_35           0x00400000      /* VDD voltage 3.4 ~ 3.5 */
#define MMC_VDD_35_36           0x00800000      /* VDD voltage 3.5 ~ 3.6 */

        unsigned long           caps;           /* Host capabilities */

#define MMC_CAP_4_BIT_DATA      (1 << 0)        /* Can the host do 4 bit transfers */
#define MMC_CAP_MMC_HIGHSPEED   (1 << 1)        /* Can do MMC high-speed timing */
#define MMC_CAP_SD_HIGHSPEED    (1 << 2)        /* Can do SD high-speed timing */
#define MMC_CAP_SDIO_IRQ        (1 << 3)        /* Can signal pending SDIO IRQs */
#define MMC_CAP_SPI             (1 << 4)        /* Talks only SPI protocols */
#define MMC_CAP_NEEDS_POLL      (1 << 5)        /* Needs polling for card-detection */

        /* host specific block data */
        unsigned int            max_seg_size;   /* see blk_queue_max_segment_size */
        unsigned short          max_hw_segs;    /* see blk_queue_max_hw_segments */
        unsigned short          max_phys_segs;  /* see blk_queue_max_phys_segments */
        unsigned short          unused;
        unsigned int            max_req_size;   /* maximum number of bytes in one req */
        unsigned int            max_blk_size;   /* maximum size of one mmc block */
        unsigned int            max_blk_count;  /* maximum number of blocks in one req */

        /* private data */
        spinlock_t              lock;           /* lock for claim and bus ops */

        struct mmc_ios          ios;            /* current io bus settings */
        u32                     ocr;            /* the current OCR setting */

        /* group bitfields together to minimize padding */
        unsigned int            use_spi_crc:1;
        unsigned int            claimed:1;      /* host exclusively claimed */
        unsigned int            bus_dead:1;     /* bus has been released */
#ifdef CONFIG_MMC_DEBUG
        unsigned int            removed:1;      /* host is being removed */
#endif

        struct mmc_card         *card;          /* device attached to this host */

        wait_queue_head_t       wq;

        struct delayed_work     detect;

        const struct mmc_bus_ops *bus_ops;      /* current bus driver */
        unsigned int            bus_refs;       /* reference counter */

        unsigned int            sdio_irqs;
        struct task_struct      *sdio_irq_thread;
        atomic_t                sdio_irq_thread_abort;

#ifdef CONFIG_LEDS_TRIGGERS
        struct led_trigger      *led;           /* activity led */
#endif

        struct dentry           *debugfs_root;

        unsigned long           private[0] ____cacheline_aligned;
};

extern struct mmc_host *mmc_alloc_host(int extra, struct device *);
extern int mmc_add_host(struct mmc_host *);
extern void mmc_remove_host(struct mmc_host *);
extern void mmc_free_host(struct mmc_host *);

static inline void *mmc_priv(struct mmc_host *host)
{
        return (void *)host->private;
}

#define mmc_host_is_spi(host)   ((host)->caps & MMC_CAP_SPI)

#define mmc_dev(x)      ((x)->parent)
#define mmc_classdev(x) (&(x)->class_dev)
#define mmc_hostname(x) ((x)->class_dev.bus_id)

extern int mmc_suspend_host(struct mmc_host *, pm_message_t);
extern int mmc_resume_host(struct mmc_host *);

extern void mmc_detect_change(struct mmc_host *, unsigned long delay);
extern void mmc_request_done(struct mmc_host *, struct mmc_request *);

static inline void mmc_signal_sdio_irq(struct mmc_host *host)
{
        host->ops->enable_sdio_irq(host, 0);
        wake_up_process(host->sdio_irq_thread);
}

#endif


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