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
  15 #include <linux/mmc/core.h>
  16
  17 struct mmc_ios {
  18         unsigned int    clock;                  /* clock rate */
  19         unsigned short  vdd;
  20
  21 /* vdd stores the bit number of the selected voltage range from below. */
  22
  23         unsigned char   bus_mode;               /* command output mode */
  24
  25 #define MMC_BUSMODE_OPENDRAIN   1
  26 #define MMC_BUSMODE_PUSHPULL    2
  27
  28         unsigned char   chip_select;            /* SPI chip select */
  29
  30 #define MMC_CS_DONTCARE         0
  31 #define MMC_CS_HIGH             1
  32 #define MMC_CS_LOW              2
  33
  34         unsigned char   power_mode;             /* power supply mode */
  35
  36 #define MMC_POWER_OFF           0
  37 #define MMC_POWER_UP            1
  38 #define MMC_POWER_ON            2
  39
  40         unsigned char   bus_width;              /* data bus width */
  41
  42 #define MMC_BUS_WIDTH_1         0
  43 #define MMC_BUS_WIDTH_4         2
  44
  45         unsigned char   timing;                 /* timing specification used */
  46
  47 #define MMC_TIMING_LEGACY       0
  48 #define MMC_TIMING_MMC_HS       1
  49 #define MMC_TIMING_SD_HS        2
  50 };
  51
  52 struct mmc_host_ops {
  53         void    (*request)(struct mmc_host *host, struct mmc_request *req);
  54         /*
  55          * Avoid calling these three functions too often or in a "fast path",
  56          * since underlaying controller might implement them in an expensive
  57          * and/or slow way.
  58          *
  59          * Also note that these functions might sleep, so don't call them
  60          * in the atomic contexts!
  61          *
  62          * Return values for the get_ro callback should be:
  63          *   0 for a read/write card
  64          *   1 for a read-only card
  65          *   -ENOSYS when not supported (equal to NULL callback)
  66          *   or a negative errno value when something bad happened
  67          *
  68          * Return values for the get_ro callback should be:
  69          *   0 for a absent card
  70          *   1 for a present card
  71          *   -ENOSYS when not supported (equal to NULL callback)
  72          *   or a negative errno value when something bad happened
  73          */
  74         void    (*set_ios)(struct mmc_host *host, struct mmc_ios *ios);
  75         int     (*get_ro)(struct mmc_host *host);
  76         int     (*get_cd)(struct mmc_host *host);
  77
  78         void    (*enable_sdio_irq)(struct mmc_host *host, int enable);
  79 };
  80
  81 struct mmc_card;
  82 struct device;
  83
  84 struct mmc_host {
  85         struct device           *parent;
  86         struct device           class_dev;
  87         int                     index;
  88         const struct mmc_host_ops *ops;
  89         unsigned int            f_min;
  90         unsigned int            f_max;
  91         u32                     ocr_avail;
  92
  93 #define MMC_VDD_165_195         0x00000080      /* VDD voltage 1.65 - 1.95 */
  94 #define MMC_VDD_20_21           0x00000100      /* VDD voltage 2.0 ~ 2.1 */
  95 #define MMC_VDD_21_22           0x00000200      /* VDD voltage 2.1 ~ 2.2 */
  96 #define MMC_VDD_22_23           0x00000400      /* VDD voltage 2.2 ~ 2.3 */
  97 #define MMC_VDD_23_24           0x00000800      /* VDD voltage 2.3 ~ 2.4 */
  98 #define MMC_VDD_24_25           0x00001000      /* VDD voltage 2.4 ~ 2.5 */
  99 #define MMC_VDD_25_26           0x00002000      /* VDD voltage 2.5 ~ 2.6 */
 100 #define MMC_VDD_26_27           0x00004000      /* VDD voltage 2.6 ~ 2.7 */
 101 #define MMC_VDD_27_28           0x00008000      /* VDD voltage 2.7 ~ 2.8 */
 102 #define MMC_VDD_28_29           0x00010000      /* VDD voltage 2.8 ~ 2.9 */
 103 #define MMC_VDD_29_30           0x00020000      /* VDD voltage 2.9 ~ 3.0 */
 104 #define MMC_VDD_30_31           0x00040000      /* VDD voltage 3.0 ~ 3.1 */
 105 #define MMC_VDD_31_32           0x00080000      /* VDD voltage 3.1 ~ 3.2 */
 106 #define MMC_VDD_32_33           0x00100000      /* VDD voltage 3.2 ~ 3.3 */
 107 #define MMC_VDD_33_34           0x00200000      /* VDD voltage 3.3 ~ 3.4 */
 108 #define MMC_VDD_34_35           0x00400000      /* VDD voltage 3.4 ~ 3.5 */
 109 #define MMC_VDD_35_36           0x00800000      /* VDD voltage 3.5 ~ 3.6 */
 110
 111         unsigned long           caps;           /* Host capabilities */
 112
 113 #define MMC_CAP_4_BIT_DATA      (1 << 0)        /* Can the host do 4 bit transfers */
 114 #define MMC_CAP_MMC_HIGHSPEED   (1 << 1)        /* Can do MMC high-speed timing */
 115 #define MMC_CAP_SD_HIGHSPEED    (1 << 2)        /* Can do SD high-speed timing */
 116 #define MMC_CAP_SDIO_IRQ        (1 << 3)        /* Can signal pending SDIO IRQs */
 117 #define MMC_CAP_SPI             (1 << 4)        /* Talks only SPI protocols */
 118 #define MMC_CAP_NEEDS_POLL      (1 << 5)        /* Needs polling for card-detection */
 119
 120         /* host specific block data */
 121         unsigned int            max_seg_size;   /* see blk_queue_max_segment_size */
 122         unsigned short          max_hw_segs;    /* see blk_queue_max_hw_segments */
 123         unsigned short          max_phys_segs;  /* see blk_queue_max_phys_segments */
 124         unsigned short          unused;
 125         unsigned int            max_req_size;   /* maximum number of bytes in one req */
 126         unsigned int            max_blk_size;   /* maximum size of one mmc block */
 127         unsigned int            max_blk_count;  /* maximum number of blocks in one req */
 128
 129         /* private data */
 130         spinlock_t              lock;           /* lock for claim and bus ops */
 131
 132         struct mmc_ios          ios;            /* current io bus settings */
 133         u32                     ocr;            /* the current OCR setting */
 134
 135         /* group bitfields together to minimize padding */
 136         unsigned int            use_spi_crc:1;
 137         unsigned int            claimed:1;      /* host exclusively claimed */
 138         unsigned int            bus_dead:1;     /* bus has been released */
 139 #ifdef CONFIG_MMC_DEBUG
 140         unsigned int            removed:1;      /* host is being removed */
 141 #endif
 142
 143         struct mmc_card         *card;          /* device attached to this host */
 144
 145         wait_queue_head_t       wq;
 146
 147         struct delayed_work     detect;
 148
 149         const struct mmc_bus_ops *bus_ops;      /* current bus driver */
 150         unsigned int            bus_refs;       /* reference counter */
 151
 152         unsigned int            sdio_irqs;
 153         struct task_struct      *sdio_irq_thread;
 154         atomic_t                sdio_irq_thread_abort;
 155
 156 #ifdef CONFIG_LEDS_TRIGGERS
 157         struct led_trigger      *led;           /* activity led */
 158 #endif
 159
 160         struct dentry           *debugfs_root;
 161
 162         unsigned long           private[0] ____cacheline_aligned;
 163 };
 164
 165 extern struct mmc_host *mmc_alloc_host(int extra, struct device *);
 166 extern int mmc_add_host(struct mmc_host *);
 167 extern void mmc_remove_host(struct mmc_host *);
 168 extern void mmc_free_host(struct mmc_host *);
 169
 170 static inline void *mmc_priv(struct mmc_host *host)
 171 {
 172         return (void *)host->private;
 173 }
 174
 175 #define mmc_host_is_spi(host)   ((host)->caps & MMC_CAP_SPI)
 176
 177 #define mmc_dev(x)      ((x)->parent)
 178 #define mmc_classdev(x) (&(x)->class_dev)
 179 #define mmc_hostname(x) ((x)->class_dev.bus_id)
 180
 181 extern int mmc_suspend_host(struct mmc_host *, pm_message_t);
 182 extern int mmc_resume_host(struct mmc_host *);
 183
 184 extern void mmc_detect_change(struct mmc_host *, unsigned long delay);
 185 extern void mmc_request_done(struct mmc_host *, struct mmc_request *);
 186
 187 static inline void mmc_signal_sdio_irq(struct mmc_host *host)
 188 {
 189         host->ops->enable_sdio_irq(host, 0);
 190         wake_up_process(host->sdio_irq_thread);
 191 }
 192
 193 #endif
 194