drivers/sdmmc/slot.c File Reference

SD/MMC slot driver. More...

#include <bitops.h>
#include <byteorder.h>
#include <debug.h>
#include <errno.h>
#include <stdbool.h>
#include <string.h>
#include <util.h>
#include <sdmmc/sdmmc.h>
#include "protocol.h"

Include dependency graph for slot.c:

Go to the source code of this file.

Functions
void	sdmmc_slot_submit_req (struct sdmmc_slot *slot, struct sdmmc_request *req)
	Submit SD/MMC request to slot.
uint32_t	sdmmc_slot_set_voltage (struct sdmmc_slot *slot, uint32_t ocr)
	Set possible supported voltage on slot.
void	sdmmc_slot_power_up (struct sdmmc_slot *slot)
	Enable power to a slot.
void	sdmmc_slot_power_down (struct sdmmc_slot *slot)
	Disable power to a slot.
void	sdmmc_slot_set_f_max (struct sdmmc_slot *slot, int32_t f_max)
	Set the maximum MCK rate for a slot.
void	sdmmc_slot_set_bus_width (struct sdmmc_slot *slot, unsigned int bits)
	Set the bus width of a slot.
void	sdmmc_slot_notify_card_detect (struct sdmmc_slot *slot, int cd_value)
	Notify slot about change in hw card detect.
void	sdmmc_slot_init (struct sdmmc_slot *slot, struct sdmmc_host *host, int slot_id)
	Init slot structure.

---

Detailed Description

SD/MMC slot driver.

SD/MMC slot driver is an abstraction on top of the host.

• Compiler: IAR EWAVR32 and GNU GCC for AVR32
• Supported devices: All devices
• AppNote:

Author:

Atmel Corporation: http://www.atmel.com
Support and FAQ: http://support.atmel.no/

Definition in file slot.c.

---

Function Documentation

void sdmmc_slot_init	(	struct sdmmc_slot *	slot,
		struct sdmmc_host *	host,
		int	slot_id
	)

Init slot structure.

Parameters:

	slot	sdmmc_slot to be initialized
	host	pointer to sdmmc_host structure
	slot_id	slot identificator

Definition at line 139 of file slot.c.

References sdmmc_slot::f_max, sdmmc_slot::flags, sdmmc_slot::host, sdmmc_slot::id, and sdmmc_slot::notify_card_detect.

Referenced by sdmmc_mcihost_init().

void sdmmc_slot_notify_card_detect	(	struct sdmmc_slot *	slot,
		int	value
	)

Notify slot about change in hw card detect.

Can be called to notify about change in card detection. Ususally called by card detect handler.

Parameters:

	slot	sdmmc_slot
	value	Zero for no detection and non-zero for detection

Definition at line 128 of file slot.c.

References clear_bit(), sdmmc_slot::context, sdmmc_slot::flags, sdmmc_slot::notify_card_detect, SDMMC_SLOT_CARD_DETECT, and set_bit().

Here is the call graph for this function:

void sdmmc_slot_power_down

(

struct sdmmc_slot *

slot

)

Disable power to a slot.

When this function returns, any card inserted into slot will not be powered, if power switching is supported on the current board/host combination. This function also sets the clock rate to "don't care" so that any other slots sharing the same clock line may be able to run faster.

Definition at line 104 of file slot.c.

References sdmmc_slot::host, sdmmc_host::power_down, and sdmmc_slot_set_f_max().

Here is the call graph for this function:

void sdmmc_slot_power_up

(

struct sdmmc_slot *

slot

)

Enable power to a slot.

When this function returns, any card inserted into slot will be powered. This function also resets the bus width to 1 bit and clears any high-speed state bits.

Definition at line 96 of file slot.c.

References sdmmc_slot::bus_width, clear_bit(), sdmmc_slot::flags, sdmmc_slot::host, sdmmc_host::power_up, SDMMC_SLOT_HIGH_SPEED, and sdmmc_slot_set_f_max().

Here is the call graph for this function:

void sdmmc_slot_set_bus_width	(	struct sdmmc_slot *	slot,
		unsigned int	bits
	)

Set the bus width of a slot.

Parameters:

	slot	A MMC/SD card slot
	bits	The new bus width in bits

Definition at line 122 of file slot.c.

References sdmmc_slot::bus_width, and sdmmc_slot_update().

Here is the call graph for this function:

void sdmmc_slot_set_f_max	(	struct sdmmc_slot *	slot,
		int32_t	f_max
	)

Set the maximum MCK rate for a slot.

The bus frequency of the MCK line will be set to f_max Hz, rounded down to the nearest supported value, or up to the lowest rate supported by the host.

Parameters:

	slot	A MMC/SD card slot
	f_max	The maximum MCK rate in Hz. A negative value means "don't care" (i.e. the slot is inactive). Zero means that the clock should stop completely.

Definition at line 111 of file slot.c.

References sdmmc_slot::f_max, sdmmc_host::f_min, sdmmc_slot::host, and sdmmc_slot_update().

Referenced by sdmmc_slot_power_down(), and sdmmc_slot_power_up().

Here is the call graph for this function:

uint32_t sdmmc_slot_set_voltage	(	struct sdmmc_slot *	slot,
		uint32_t	ocr
	)

Set possible supported voltage on slot.

Parameters:

	slot	Slot
	ocr	Card Operation Condition Register

Returns:

Possible Operation Condition Register

Definition at line 59 of file slot.c.

References dbg_verbose, ffs(), sdmmc_slot::host, sdmmc_host::ocr_avail, SDMMC_OCR_LOW_VOLTAGE, and sdmmc_host::set_voltage.

Here is the call graph for this function:

void sdmmc_slot_submit_req	(	struct sdmmc_slot *	slot,
		struct sdmmc_request *	req
	)

Submit SD/MMC request to slot.

Parameters:

	slot	Slot to submit request to
	req	Request to submit

Definition at line 53 of file slot.c.

References sdmmc_slot::host, sdmmc_request::slot, and sdmmc_host::submit_req.