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/sched.h>
  15
  16 #include <linux/mmc/core.h>
  17 #include <linux/mmc/pm.h>
  18
  19 struct mmc_ios {
  20         unsigned int    clock;                  /* clock rate */
  21         unsigned short  vdd;
  22
  23 /* vdd stores the bit number of the selected voltage range from below. */
  24
  25         unsigned char   bus_mode;               /* command output mode */
  26
  27 #define MMC_BUSMODE_OPENDRAIN   1
  28 #define MMC_BUSMODE_PUSHPULL    2
  29
  30         unsigned char   chip_select;            /* SPI chip select */
  31
  32 #define MMC_CS_DONTCARE         0
  33 #define MMC_CS_HIGH             1
  34 #define MMC_CS_LOW              2
  35
  36         unsigned char   power_mode;             /* power supply mode */
  37
  38 #define MMC_POWER_OFF           0
  39 #define MMC_POWER_UP            1
  40 #define MMC_POWER_ON            2
  41
  42         unsigned char   bus_width;              /* data bus width */
  43
  44 #define MMC_BUS_WIDTH_1         0
  45 #define MMC_BUS_WIDTH_4         2
  46 #define MMC_BUS_WIDTH_8         3
  47
  48         unsigned char   timing;                 /* timing specification used */
  49
  50 #define MMC_TIMING_LEGACY       0
  51 #define MMC_TIMING_MMC_HS       1
  52 #define MMC_TIMING_SD_HS        2
  53 };
  54
  55 struct mmc_host_ops {
  56         /*
  57          * Hosts that support power saving can use the 'enable' and 'disable'
  58          * methods to exit and enter power saving states. 'enable' is called
  59          * when the host is claimed and 'disable' is called (or scheduled with
  60          * a delay) when the host is released. The 'disable' is scheduled if
  61          * the disable delay set by 'mmc_set_disable_delay()' is non-zero,
  62          * otherwise 'disable' is called immediately. 'disable' may be
  63          * scheduled repeatedly, to permit ever greater power saving at the
  64          * expense of ever greater latency to re-enable. Rescheduling is
  65          * determined by the return value of the 'disable' method. A positive
  66          * value gives the delay in milliseconds.
  67          *
  68          * In the case where a host function (like set_ios) may be called
  69          * with or without the host claimed, enabling and disabling can be
  70          * done directly and will nest correctly. Call 'mmc_host_enable()' and
  71          * 'mmc_host_lazy_disable()' for this purpose, but note that these
  72          * functions must be paired.
  73          *
  74          * Alternatively, 'mmc_host_enable()' may be paired with
  75          * 'mmc_host_disable()' which calls 'disable' immediately.  In this
  76          * case the 'disable' method will be called with 'lazy' set to 0.
  77          * This is mainly useful for error paths.
  78          *
  79          * Because lazy disable may be called from a work queue, the 'disable'
  80          * method must claim the host when 'lazy' != 0, which will work
  81          * correctly because recursion is detected and handled.
  82          */
  83         int (*enable)(struct mmc_host *host);
  84         int (*disable)(struct mmc_host *host, int lazy);
  85         void    (*request)(struct mmc_host *host, struct mmc_request *req);
  86         /*
  87          * Avoid calling these three functions too often or in a "fast path",
  88          * since underlaying controller might implement them in an expensive
  89          * and/or slow way.
  90          *
  91          * Also note that these functions might sleep, so don't call them
  92          * in the atomic contexts!
  93          *
  94          * Return values for the get_ro callback should be:
  95          *   0 for a read/write card
  96          *   1 for a read-only card
  97          *   -ENOSYS when not supported (equal to NULL callback)
  98          *   or a negative errno value when something bad happened
  99          *
 100          * Return values for the get_cd callback should be:
 101          *   0 for a absent card
 102          *   1 for a present card
 103          *   -ENOSYS when not supported (equal to NULL callback)
 104          *   or a negative errno value when something bad happened
 105          */
 106         void    (*set_ios)(struct mmc_host *host, struct mmc_ios *ios);
 107         int     (*get_ro)(struct mmc_host *host);
 108         int     (*get_cd)(struct mmc_host *host);
 109
 110         void    (*enable_sdio_irq)(struct mmc_host *host, int enable);
 111 };
 112
 113 struct mmc_card;
 114 struct device;
 115
 116 struct mmc_host {
 117         struct device           *parent;
 118         struct device           class_dev;
 119         int                     index;
 120         const struct mmc_host_ops *ops;
 121         unsigned int            f_min;
 122         unsigned int            f_max;
 123         u32                     ocr_avail;
 124
 125 #define MMC_VDD_165_195         0x00000080      /* VDD voltage 1.65 - 1.95 */
 126 #define MMC_VDD_20_21           0x00000100      /* VDD voltage 2.0 ~ 2.1 */
 127 #define MMC_VDD_21_22           0x00000200      /* VDD voltage 2.1 ~ 2.2 */
 128 #define MMC_VDD_22_23           0x00000400      /* VDD voltage 2.2 ~ 2.3 */
 129 #define MMC_VDD_23_24           0x00000800      /* VDD voltage 2.3 ~ 2.4 */
 130 #define MMC_VDD_24_25           0x00001000      /* VDD voltage 2.4 ~ 2.5 */
 131 #define MMC_VDD_25_26           0x00002000      /* VDD voltage 2.5 ~ 2.6 */
 132 #define MMC_VDD_26_27           0x00004000      /* VDD voltage 2.6 ~ 2.7 */
 133 #define MMC_VDD_27_28           0x00008000      /* VDD voltage 2.7 ~ 2.8 */
 134 #define MMC_VDD_28_29           0x00010000      /* VDD voltage 2.8 ~ 2.9 */
 135 #define MMC_VDD_29_30           0x00020000      /* VDD voltage 2.9 ~ 3.0 */
 136 #define MMC_VDD_30_31           0x00040000      /* VDD voltage 3.0 ~ 3.1 */
 137 #define MMC_VDD_31_32           0x00080000      /* VDD voltage 3.1 ~ 3.2 */
 138 #define MMC_VDD_32_33           0x00100000      /* VDD voltage 3.2 ~ 3.3 */
 139 #define MMC_VDD_33_34           0x00200000      /* VDD voltage 3.3 ~ 3.4 */
 140 #define MMC_VDD_34_35           0x00400000      /* VDD voltage 3.4 ~ 3.5 */
 141 #define MMC_VDD_35_36           0x00800000      /* VDD voltage 3.5 ~ 3.6 */
 142
 143         unsigned long           caps;           /* Host capabilities */
 144
 145 #define MMC_CAP_4_BIT_DATA      (1 << 0)        /* Can the host do 4 bit transfers */
 146 #define MMC_CAP_MMC_HIGHSPEED   (1 << 1)        /* Can do MMC high-speed timing */
 147 #define MMC_CAP_SD_HIGHSPEED    (1 << 2)        /* Can do SD high-speed timing */
 148 #define MMC_CAP_SDIO_IRQ        (1 << 3)        /* Can signal pending SDIO IRQs */
 149 #define MMC_CAP_SPI             (1 << 4)        /* Talks only SPI protocols */
 150 #define MMC_CAP_NEEDS_POLL      (1 << 5)        /* Needs polling for card-detection */
 151 #define MMC_CAP_8_BIT_DATA      (1 << 6)        /* Can the host do 8 bit transfers */
 152 #define MMC_CAP_DISABLE         (1 << 7)        /* Can the host be disabled */
 153 #define MMC_CAP_NONREMOVABLE    (1 << 8)        /* Nonremovable e.g. eMMC */
 154 #define MMC_CAP_WAIT_WHILE_BUSY (1 << 9)        /* Waits while card is busy */
 155
 156         mmc_pm_flag_t           pm_caps;        /* supported pm features */
 157
 158         /* host specific block data */
 159         unsigned int            max_seg_size;   /* see blk_queue_max_segment_size */
 160         unsigned short          max_hw_segs;    /* see blk_queue_max_hw_segments */
 161         unsigned short          max_phys_segs;  /* see blk_queue_max_phys_segments */
 162         unsigned short          unused;
 163         unsigned int            max_req_size;   /* maximum number of bytes in one req */
 164         unsigned int            max_blk_size;   /* maximum size of one mmc block */
 165         unsigned int            max_blk_count;  /* maximum number of blocks in one req */
 166
 167         /* private data */
 168         spinlock_t              lock;           /* lock for claim and bus ops */
 169
 170         struct mmc_ios          ios;            /* current io bus settings */
 171         u32                     ocr;            /* the current OCR setting */
 172
 173         /* group bitfields together to minimize padding */
 174         unsigned int            use_spi_crc:1;
 175         unsigned int            claimed:1;      /* host exclusively claimed */
 176         unsigned int            bus_dead:1;     /* bus has been released */
 177 #ifdef CONFIG_MMC_DEBUG
 178         unsigned int            removed:1;      /* host is being removed */
 179 #endif
 180
 181         /* Only used with MMC_CAP_DISABLE */
 182         int                     enabled;        /* host is enabled */
 183         int                     nesting_cnt;    /* "enable" nesting count */
 184         int                     en_dis_recurs;  /* detect recursion */
 185         unsigned int            disable_delay;  /* disable delay in msecs */
 186         struct delayed_work     disable;        /* disabling work */
 187
 188         struct mmc_card         *card;          /* device attached to this host */
 189
 190         wait_queue_head_t       wq;
 191         struct task_struct      *claimer;       /* task that has host claimed */
 192         int                     claim_cnt;      /* "claim" nesting count */
 193
 194         struct delayed_work     detect;
 195
 196         const struct mmc_bus_ops *bus_ops;      /* current bus driver */
 197         unsigned int            bus_refs;       /* reference counter */
 198
 199         unsigned int            sdio_irqs;
 200         struct task_struct      *sdio_irq_thread;
 201         atomic_t                sdio_irq_thread_abort;
 202
 203         mmc_pm_flag_t           pm_flags;       /* requested pm features */
 204
 205 #ifdef CONFIG_LEDS_TRIGGERS
 206         struct led_trigger      *led;           /* activity led */
 207 #endif
 208
 209         struct dentry           *debugfs_root;
 210
 211         unsigned long           private[0] ____cacheline_aligned;
 212 };
 213
 214 extern struct mmc_host *mmc_alloc_host(int extra, struct device *);
 215 extern int mmc_add_host(struct mmc_host *);
 216 extern void mmc_remove_host(struct mmc_host *);
 217 extern void mmc_free_host(struct mmc_host *);
 218
 219 static inline void *mmc_priv(struct mmc_host *host)
 220 {
 221         return (void *)host->private;
 222 }
 223
 224 #define mmc_host_is_spi(host)   ((host)->caps & MMC_CAP_SPI)
 225
 226 #define mmc_dev(x)      ((x)->parent)
 227 #define mmc_classdev(x) (&(x)->class_dev)
 228 #define mmc_hostname(x) (dev_name(&(x)->class_dev))
 229
 230 extern int mmc_suspend_host(struct mmc_host *, pm_message_t);
 231 extern int mmc_resume_host(struct mmc_host *);
 232
 233 extern void mmc_power_save_host(struct mmc_host *host);
 234 extern void mmc_power_restore_host(struct mmc_host *host);
 235
 236 extern void mmc_detect_change(struct mmc_host *, unsigned long delay);
 237 extern void mmc_request_done(struct mmc_host *, struct mmc_request *);
 238
 239 static inline void mmc_signal_sdio_irq(struct mmc_host *host)
 240 {
 241         host->ops->enable_sdio_irq(host, 0);
 242         wake_up_process(host->sdio_irq_thread);
 243 }
 244
 245 struct regulator;
 246
 247 int mmc_regulator_get_ocrmask(struct regulator *supply);
 248 int mmc_regulator_set_ocr(struct regulator *supply, unsigned short vdd_bit);
 249
 250 int mmc_card_awake(struct mmc_host *host);
 251 int mmc_card_sleep(struct mmc_host *host);
 252 int mmc_card_can_sleep(struct mmc_host *host);
 253
 254 int mmc_host_enable(struct mmc_host *host);
 255 int mmc_host_disable(struct mmc_host *host);
 256 int mmc_host_lazy_disable(struct mmc_host *host);
 257
 258 static inline void mmc_set_disable_delay(struct mmc_host *host,
 259                                          unsigned int disable_delay)
 260 {
 261         host->disable_delay = disable_delay;
 262 }
 263
 264 #endif
 265