FreeRTOS/Demo/CORTEX_A9_Zynq_ZC702/RTOSDemo_bsp/ps7_cortexa9_0/include/xsdps.h

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/**
*
* @file xsdps.h
*
* This file contains the implementation of XSdPs driver.
* This driver is used initialize read from and write to the SD card.
* Features such as switching bus width to 4-bit and switching to high speed,
* changing clock frequency, block size etc. are supported.
* SD 2.0 uses 1/4 bus width and speeds of 25/50KHz. Initialization, however
* is done using 1-bit bus width and 400KHz clock frequency.
* SD commands are classified as broadcast and addressed. Commands can be
* those with response only (using only command line) or
* response + data (using command and data lines).
* Only one command can be sent at a time. During a data transfer however,
* when dsta lines are in use, certain commands (which use only the command
* line) can be sent, most often to obtain status.
* This driver does not support multi card slots at present.
*
* Intialization:
* This includes initialization on the host controller side to select
* clock frequency, bus power and default transfer related parameters.
* The default voltage is 3.3V.
* On the SD card side, the initialization and identification state diagram is
* implemented. This resets the card, gives it a unique address/ID and
* identifies key card related specifications.
*
* Data transfer:
* The SD card is put in tranfer state to read from or write to it.
* The default block size is 512 bytes and if supported,
* default bus width is 4-bit and bus speed is High speed.
* The read and write functions are implemented in polled mode using ADMA2.
*
* At any point, when key parameters such as block size or
* clock/speed or bus width are modified, this driver takes care of
* maintaining the same selection on host and card.
* All error bits in host controller are monitored by the driver and in the
* event one of them is set, driver will clear the interrupt status and
* communicate failure to the upper layer.
*
* File system use:
* This driver can be used with xilffs library to read and write files to SD.
* (Please refer to procedure in diskio.c). The file system read/write example
* in polled mode can used for reference.
*
* There is no example for using SD driver without file system at present.
* However, the driver can be used without the file system. The glue layer
* in filesytem can be used as reference for the same. The block count
* passed to the read/write function in one call is limited by the ADMA2
* descriptor table and hence care will have to be taken to call read/write
* API's in a loop for large file sizes.
*
* Interrupt mode is not supported because it offers no improvement when used
* with file system.
*
* eMMC support:
* SD driver supports SD and eMMC based on the "enable MMC" parameter in SDK.
* The features of eMMC supported by the driver will depend on those supported
* by the host controller. The current driver supports read/write on eMMC card
* using 4-bit and high speed mode currently.
*
* Features not supported include - card write protect, password setting,
* lock/unlock, interrupts, SDMA mode, programmed I/O mode and
* 64-bit addressed ADMA2, erase/pre-erase commands.
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver   Who    Date     Changes
* ----- ---    -------- -----------------------------------------------
* 1.00a hk/sg  10/17/13 Initial release
* 2.0   hk      03/07/14 Version number revised.
* 2.1   hk     04/18/14 Increase sleep for eMMC switch command.
*                       Add sleep for microblaze designs. CR# 781117.
*
* </pre>
*
******************************************************************************/


#ifndef SDPS_H_
#define SDPS_H_

#ifdef __cplusplus
extern "C" {
#endif

#include "xstatus.h"
#include "xsdps_hw.h"
#include <string.h>

/************************** Constant Definitions *****************************/

/**************************** Type Definitions *******************************/
/**
 * This typedef contains configuration information for the device.
 */
typedef struct {
	u16 DeviceId;			/**< Unique ID  of device */
	u32 BaseAddress;		/**< Base address of the device */
	u32 InputClockHz;		/**< Input clock frequency */
} XSdPs_Config;

/*
 * ADMA2 descriptor table
 */
typedef struct {
	u16 Attribute;		/**< Attributes of descriptor */
	u16 Length;		/**< Length of current dma transfer */
	u32 Address;		/**< Address of current dma transfer */
} XSdPs_Adma2Descriptor;

/**
 * The XSdPs driver instance data. The user is required to allocate a
 * variable of this type for every SD device in the system. A pointer
 * to a variable of this type is then passed to the driver API functions.
 */
typedef struct {
	XSdPs_Config Config;	/**< Configuration structure */
	u32 IsReady;		/**< Device is initialized and ready */
	u32 Host_Caps;		/**< Capabilities of host controller */
	u32 HCS;		/**< High capacity support in card */
	u32 CardID[4];		/**< Card ID */
	u32 RelCardAddr;	/**< Relative Card Address */
	XSdPs_Adma2Descriptor Adma2_DescrTbl[32]; /**< ADMA Descriptors */
} XSdPs;

/***************** Macros (Inline Functions) Definitions *********************/

/************************** Function Prototypes ******************************/
XSdPs_Config *XSdPs_LookupConfig(u16 DeviceId);
int XSdPs_CfgInitialize(XSdPs *InstancePtr, XSdPs_Config *ConfigPtr,
				u32 EffectiveAddr);
int XSdPs_SdCardInitialize(XSdPs *InstancePtr);
int XSdPs_ReadPolled(XSdPs *InstancePtr, u32 Arg, u32 BlkCnt, u8 *Buff);
int XSdPs_WritePolled(XSdPs *InstancePtr, u32 Arg, u32 BlkCnt, const u8 *Buff);
int XSdPs_SetBlkSize(XSdPs *InstancePtr, u16 BlkSize);
int XSdPs_Select_Card (XSdPs *InstancePtr);
int XSdPs_Change_ClkFreq(XSdPs *InstancePtr, u32 SelFreq);
int XSdPs_Change_BusWidth(XSdPs *InstancePtr);
int XSdPs_Change_BusSpeed(XSdPs *InstancePtr);
int XSdPs_Get_BusWidth(XSdPs *InstancePtr, u8 *SCR);
int XSdPs_Get_BusSpeed(XSdPs *InstancePtr, u8 *ReadBuff);
int XSdPs_Pullup(XSdPs *InstancePtr);
int XSdPs_MmcCardInitialize(XSdPs *InstancePtr);
int XSdPs_Get_Mmc_ExtCsd(XSdPs *InstancePtr, u8 *ReadBuff);

#ifdef __cplusplus
}
#endif

#endif /* SD_H_ */