266 lines
9.1 KiB
C
266 lines
9.1 KiB
C
/*
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* linux/include/linux/mmc/host.h
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Host driver specific definitions.
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*/
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#ifndef LINUX_MMC_HOST_H
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#define LINUX_MMC_HOST_H
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#include <linux/leds.h>
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#include <linux/sched.h>
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#include <linux/mmc/core.h>
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#include <linux/mmc/pm.h>
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struct mmc_ios {
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unsigned int clock; /* clock rate */
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unsigned short vdd;
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/* vdd stores the bit number of the selected voltage range from below. */
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unsigned char bus_mode; /* command output mode */
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#define MMC_BUSMODE_OPENDRAIN 1
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#define MMC_BUSMODE_PUSHPULL 2
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unsigned char chip_select; /* SPI chip select */
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#define MMC_CS_DONTCARE 0
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#define MMC_CS_HIGH 1
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#define MMC_CS_LOW 2
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unsigned char power_mode; /* power supply mode */
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#define MMC_POWER_OFF 0
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#define MMC_POWER_UP 1
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#define MMC_POWER_ON 2
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unsigned char bus_width; /* data bus width */
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#define MMC_BUS_WIDTH_1 0
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#define MMC_BUS_WIDTH_4 2
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#define MMC_BUS_WIDTH_8 3
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unsigned char timing; /* timing specification used */
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#define MMC_TIMING_LEGACY 0
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#define MMC_TIMING_MMC_HS 1
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#define MMC_TIMING_SD_HS 2
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};
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struct mmc_host_ops {
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/*
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* Hosts that support power saving can use the 'enable' and 'disable'
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* methods to exit and enter power saving states. 'enable' is called
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* when the host is claimed and 'disable' is called (or scheduled with
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* a delay) when the host is released. The 'disable' is scheduled if
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* the disable delay set by 'mmc_set_disable_delay()' is non-zero,
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* otherwise 'disable' is called immediately. 'disable' may be
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* scheduled repeatedly, to permit ever greater power saving at the
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* expense of ever greater latency to re-enable. Rescheduling is
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* determined by the return value of the 'disable' method. A positive
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* value gives the delay in milliseconds.
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*
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* In the case where a host function (like set_ios) may be called
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* with or without the host claimed, enabling and disabling can be
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* done directly and will nest correctly. Call 'mmc_host_enable()' and
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* 'mmc_host_lazy_disable()' for this purpose, but note that these
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* functions must be paired.
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*
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* Alternatively, 'mmc_host_enable()' may be paired with
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* 'mmc_host_disable()' which calls 'disable' immediately. In this
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* case the 'disable' method will be called with 'lazy' set to 0.
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* This is mainly useful for error paths.
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*
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* Because lazy disable may be called from a work queue, the 'disable'
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* method must claim the host when 'lazy' != 0, which will work
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* correctly because recursion is detected and handled.
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*/
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int (*enable)(struct mmc_host *host);
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int (*disable)(struct mmc_host *host, int lazy);
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void (*request)(struct mmc_host *host, struct mmc_request *req);
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/*
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* Avoid calling these three functions too often or in a "fast path",
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* since underlaying controller might implement them in an expensive
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* and/or slow way.
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*
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* Also note that these functions might sleep, so don't call them
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* in the atomic contexts!
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*
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* Return values for the get_ro callback should be:
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* 0 for a read/write card
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* 1 for a read-only card
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* -ENOSYS when not supported (equal to NULL callback)
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* or a negative errno value when something bad happened
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*
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* Return values for the get_cd callback should be:
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* 0 for a absent card
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* 1 for a present card
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* -ENOSYS when not supported (equal to NULL callback)
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* or a negative errno value when something bad happened
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*/
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void (*set_ios)(struct mmc_host *host, struct mmc_ios *ios);
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int (*get_ro)(struct mmc_host *host);
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int (*get_cd)(struct mmc_host *host);
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void (*enable_sdio_irq)(struct mmc_host *host, int enable);
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};
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struct mmc_card;
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struct device;
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struct mmc_host {
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struct device *parent;
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struct device class_dev;
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int index;
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const struct mmc_host_ops *ops;
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unsigned int f_min;
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unsigned int f_max;
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u32 ocr_avail;
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#define MMC_VDD_165_195 0x00000080 /* VDD voltage 1.65 - 1.95 */
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#define MMC_VDD_20_21 0x00000100 /* VDD voltage 2.0 ~ 2.1 */
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#define MMC_VDD_21_22 0x00000200 /* VDD voltage 2.1 ~ 2.2 */
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#define MMC_VDD_22_23 0x00000400 /* VDD voltage 2.2 ~ 2.3 */
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#define MMC_VDD_23_24 0x00000800 /* VDD voltage 2.3 ~ 2.4 */
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#define MMC_VDD_24_25 0x00001000 /* VDD voltage 2.4 ~ 2.5 */
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#define MMC_VDD_25_26 0x00002000 /* VDD voltage 2.5 ~ 2.6 */
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#define MMC_VDD_26_27 0x00004000 /* VDD voltage 2.6 ~ 2.7 */
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#define MMC_VDD_27_28 0x00008000 /* VDD voltage 2.7 ~ 2.8 */
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#define MMC_VDD_28_29 0x00010000 /* VDD voltage 2.8 ~ 2.9 */
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#define MMC_VDD_29_30 0x00020000 /* VDD voltage 2.9 ~ 3.0 */
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#define MMC_VDD_30_31 0x00040000 /* VDD voltage 3.0 ~ 3.1 */
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#define MMC_VDD_31_32 0x00080000 /* VDD voltage 3.1 ~ 3.2 */
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#define MMC_VDD_32_33 0x00100000 /* VDD voltage 3.2 ~ 3.3 */
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#define MMC_VDD_33_34 0x00200000 /* VDD voltage 3.3 ~ 3.4 */
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#define MMC_VDD_34_35 0x00400000 /* VDD voltage 3.4 ~ 3.5 */
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#define MMC_VDD_35_36 0x00800000 /* VDD voltage 3.5 ~ 3.6 */
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unsigned long caps; /* Host capabilities */
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#define MMC_CAP_4_BIT_DATA (1 << 0) /* Can the host do 4 bit transfers */
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#define MMC_CAP_MMC_HIGHSPEED (1 << 1) /* Can do MMC high-speed timing */
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#define MMC_CAP_SD_HIGHSPEED (1 << 2) /* Can do SD high-speed timing */
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#define MMC_CAP_SDIO_IRQ (1 << 3) /* Can signal pending SDIO IRQs */
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#define MMC_CAP_SPI (1 << 4) /* Talks only SPI protocols */
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#define MMC_CAP_NEEDS_POLL (1 << 5) /* Needs polling for card-detection */
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#define MMC_CAP_8_BIT_DATA (1 << 6) /* Can the host do 8 bit transfers */
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#define MMC_CAP_DISABLE (1 << 7) /* Can the host be disabled */
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#define MMC_CAP_NONREMOVABLE (1 << 8) /* Nonremovable e.g. eMMC */
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#define MMC_CAP_WAIT_WHILE_BUSY (1 << 9) /* Waits while card is busy */
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mmc_pm_flag_t pm_caps; /* supported pm features */
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/* host specific block data */
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unsigned int max_seg_size; /* see blk_queue_max_segment_size */
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unsigned short max_hw_segs; /* see blk_queue_max_hw_segments */
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unsigned short max_phys_segs; /* see blk_queue_max_phys_segments */
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unsigned short unused;
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unsigned int max_req_size; /* maximum number of bytes in one req */
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unsigned int max_blk_size; /* maximum size of one mmc block */
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unsigned int max_blk_count; /* maximum number of blocks in one req */
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/* private data */
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spinlock_t lock; /* lock for claim and bus ops */
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struct mmc_ios ios; /* current io bus settings */
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u32 ocr; /* the current OCR setting */
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/* group bitfields together to minimize padding */
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unsigned int use_spi_crc:1;
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unsigned int claimed:1; /* host exclusively claimed */
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unsigned int bus_dead:1; /* bus has been released */
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#ifdef CONFIG_MMC_DEBUG
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unsigned int removed:1; /* host is being removed */
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#endif
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/* Only used with MMC_CAP_DISABLE */
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int enabled; /* host is enabled */
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int nesting_cnt; /* "enable" nesting count */
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int en_dis_recurs; /* detect recursion */
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unsigned int disable_delay; /* disable delay in msecs */
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struct delayed_work disable; /* disabling work */
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struct mmc_card *card; /* device attached to this host */
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wait_queue_head_t wq;
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struct task_struct *claimer; /* task that has host claimed */
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int claim_cnt; /* "claim" nesting count */
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struct delayed_work detect;
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const struct mmc_bus_ops *bus_ops; /* current bus driver */
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unsigned int bus_refs; /* reference counter */
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unsigned int sdio_irqs;
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struct task_struct *sdio_irq_thread;
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atomic_t sdio_irq_thread_abort;
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mmc_pm_flag_t pm_flags; /* requested pm features */
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#ifdef CONFIG_LEDS_TRIGGERS
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struct led_trigger *led; /* activity led */
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#endif
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struct dentry *debugfs_root;
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unsigned long private[0] ____cacheline_aligned;
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};
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extern struct mmc_host *mmc_alloc_host(int extra, struct device *);
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extern int mmc_add_host(struct mmc_host *);
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extern void mmc_remove_host(struct mmc_host *);
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extern void mmc_free_host(struct mmc_host *);
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static inline void *mmc_priv(struct mmc_host *host)
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{
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return (void *)host->private;
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}
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#define mmc_host_is_spi(host) ((host)->caps & MMC_CAP_SPI)
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#define mmc_dev(x) ((x)->parent)
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#define mmc_classdev(x) (&(x)->class_dev)
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#define mmc_hostname(x) (dev_name(&(x)->class_dev))
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extern int mmc_suspend_host(struct mmc_host *, pm_message_t);
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extern int mmc_resume_host(struct mmc_host *);
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extern void mmc_power_save_host(struct mmc_host *host);
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extern void mmc_power_restore_host(struct mmc_host *host);
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extern void mmc_detect_change(struct mmc_host *, unsigned long delay);
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extern void mmc_request_done(struct mmc_host *, struct mmc_request *);
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static inline void mmc_signal_sdio_irq(struct mmc_host *host)
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{
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host->ops->enable_sdio_irq(host, 0);
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wake_up_process(host->sdio_irq_thread);
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}
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struct regulator;
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int mmc_regulator_get_ocrmask(struct regulator *supply);
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int mmc_regulator_set_ocr(struct regulator *supply, unsigned short vdd_bit);
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int mmc_card_awake(struct mmc_host *host);
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int mmc_card_sleep(struct mmc_host *host);
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int mmc_card_can_sleep(struct mmc_host *host);
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int mmc_host_enable(struct mmc_host *host);
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int mmc_host_disable(struct mmc_host *host);
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int mmc_host_lazy_disable(struct mmc_host *host);
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static inline void mmc_set_disable_delay(struct mmc_host *host,
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unsigned int disable_delay)
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{
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host->disable_delay = disable_delay;
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}
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#endif
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