/* * 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 #include #include #include 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 #define MMC_BUS_WIDTH_8 3 unsigned char timing; /* timing specification used */ #define MMC_TIMING_LEGACY 0 #define MMC_TIMING_MMC_HS 1 #define MMC_TIMING_SD_HS 2 unsigned char ddr; /* dual data rate used */ #define MMC_SDR_MODE 0 #define MMC_DDR_MODE 1 }; struct mmc_host_ops { /* * Hosts that support power saving can use the 'enable' and 'disable' * methods to exit and enter power saving states. 'enable' is called * when the host is claimed and 'disable' is called (or scheduled with * a delay) when the host is released. The 'disable' is scheduled if * the disable delay set by 'mmc_set_disable_delay()' is non-zero, * otherwise 'disable' is called immediately. 'disable' may be * scheduled repeatedly, to permit ever greater power saving at the * expense of ever greater latency to re-enable. Rescheduling is * determined by the return value of the 'disable' method. A positive * value gives the delay in milliseconds. * * In the case where a host function (like set_ios) may be called * with or without the host claimed, enabling and disabling can be * done directly and will nest correctly. Call 'mmc_host_enable()' and * 'mmc_host_lazy_disable()' for this purpose, but note that these * functions must be paired. * * Alternatively, 'mmc_host_enable()' may be paired with * 'mmc_host_disable()' which calls 'disable' immediately. In this * case the 'disable' method will be called with 'lazy' set to 0. * This is mainly useful for error paths. * * Because lazy disable may be called from a work queue, the 'disable' * method must claim the host when 'lazy' != 0, which will work * correctly because recursion is detected and handled. */ int (*enable)(struct mmc_host *host); int (*disable)(struct mmc_host *host, int lazy); 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); /* optional callback for HC quirks */ void (*init_card)(struct mmc_host *host, struct mmc_card *card); }; 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; unsigned int f_init; u32 ocr_avail; struct notifier_block pm_notify; #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 */ #define MMC_CAP_8_BIT_DATA (1 << 6) /* Can the host do 8 bit transfers */ #define MMC_CAP_DISABLE (1 << 7) /* Can the host be disabled */ #define MMC_CAP_NONREMOVABLE (1 << 8) /* Nonremovable e.g. eMMC */ #define MMC_CAP_WAIT_WHILE_BUSY (1 << 9) /* Waits while card is busy */ #define MMC_CAP_ERASE (1 << 10) /* Allow erase/trim commands */ #define MMC_CAP_1_8V_DDR (1 << 11) /* can support */ /* DDR mode at 1.8V */ #define MMC_CAP_1_2V_DDR (1 << 12) /* can support */ /* DDR mode at 1.2V */ mmc_pm_flag_t pm_caps; /* supported pm features */ /* host specific block data */ unsigned int max_seg_size; /* see blk_queue_max_segment_size */ unsigned short max_segs; /* see blk_queue_max_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 /* Only used with MMC_CAP_DISABLE */ int enabled; /* host is enabled */ int rescan_disable; /* disable card detection */ int nesting_cnt; /* "enable" nesting count */ int en_dis_recurs; /* detect recursion */ unsigned int disable_delay; /* disable delay in msecs */ struct delayed_work disable; /* disabling work */ struct mmc_card *card; /* device attached to this host */ wait_queue_head_t wq; struct task_struct *claimer; /* task that has host claimed */ int claim_cnt; /* "claim" nesting count */ 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; mmc_pm_flag_t pm_flags; /* requested pm features */ #ifdef CONFIG_LEDS_TRIGGERS struct led_trigger *led; /* activity led */ #endif #ifdef CONFIG_REGULATOR bool regulator_enabled; /* regulator state */ #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) (dev_name(&(x)->class_dev)) extern int mmc_suspend_host(struct mmc_host *); extern int mmc_resume_host(struct mmc_host *); extern void mmc_power_save_host(struct mmc_host *host); extern void mmc_power_restore_host(struct mmc_host *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); } struct regulator; #ifdef CONFIG_REGULATOR int mmc_regulator_get_ocrmask(struct regulator *supply); int mmc_regulator_set_ocr(struct mmc_host *mmc, struct regulator *supply, unsigned short vdd_bit); #else static inline int mmc_regulator_get_ocrmask(struct regulator *supply) { return 0; } static inline int mmc_regulator_set_ocr(struct mmc_host *mmc, struct regulator *supply, unsigned short vdd_bit) { return 0; } #endif int mmc_card_awake(struct mmc_host *host); int mmc_card_sleep(struct mmc_host *host); int mmc_card_can_sleep(struct mmc_host *host); int mmc_host_enable(struct mmc_host *host); int mmc_host_disable(struct mmc_host *host); int mmc_host_lazy_disable(struct mmc_host *host); int mmc_pm_notify(struct notifier_block *notify_block, unsigned long, void *); static inline void mmc_set_disable_delay(struct mmc_host *host, unsigned int disable_delay) { host->disable_delay = disable_delay; } /* Module parameter */ extern int mmc_assume_removable; static inline int mmc_card_is_removable(struct mmc_host *host) { return !(host->caps & MMC_CAP_NONREMOVABLE) && mmc_assume_removable; } #endif