ixsspacc.h

u-boot 源代码

/**
 * @file IxSspAcc.h
 *
 * @brief  Header file for the IXP400 SSP Serial Port Access (IxSspAcc)
 *
 * @version $Revision: 0.1 $
 * 
 * @par
 * IXP400 SW Release version 2.0
 * 
 * -- Copyright Notice --
 * 
 * @par
 * Copyright 2001-2005, Intel Corporation.
 * All rights reserved.
 * 
 * @par
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the Intel Corporation nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * @par
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * @par
 * -- End of Copyright Notice --
 */

/**
 * @defgroup IxSspAcc IXP400 SSP Serial Port Access (IxSspAcc) API 
 *
 * @brief IXP400 SSP Serial Port Access Public API
 *
 * @{
 */
#ifndef IXSSPACC_H
#define IXSSPACC_H

#ifdef __ixp46X

#include "IxOsal.h"

/*
 * Section for enum
 */
/**
 * @ingroup IxSspAcc
 * 
 * @enum IxSspAccDataSize
 *
 * @brief The data sizes in bits that are supported by the protocol
 */
typedef enum
{
	DATA_SIZE_TOO_SMALL = 0x2,
	DATA_SIZE_4 = 0x3,
	DATA_SIZE_5,
	DATA_SIZE_6,
	DATA_SIZE_7,
	DATA_SIZE_8,
	DATA_SIZE_9,
	DATA_SIZE_10,
	DATA_SIZE_11,
	DATA_SIZE_12,
	DATA_SIZE_13,
	DATA_SIZE_14,
	DATA_SIZE_15,
	DATA_SIZE_16,
	DATA_SIZE_TOO_BIG
} IxSspAccDataSize;

/**
 * @ingroup IxSspAcc
 * 
 * @enum IxSspAccPortStatus
 *
 * @brief The status of the SSP port to be set to enable/disable
 */
typedef enum
{
	SSP_PORT_DISABLE = 0x0,
	SSP_PORT_ENABLE,
	INVALID_SSP_PORT_STATUS
} IxSspAccPortStatus;

/**
 * @ingroup IxSspAcc
 * 
 * @enum IxSspAccFrameFormat
 *
 * @brief The frame format that is to be used - SPI, SSP, or Microwire
 */
typedef enum
{
	SPI_FORMAT = 0x0,
	SSP_FORMAT,
	MICROWIRE_FORMAT,
	INVALID_FORMAT
} IxSspAccFrameFormat;

/**
 * @ingroup IxSspAcc
 * 
 * @enum IxSspAccClkSource
 *
 * @brief The source to produce the SSP serial clock
 */
typedef enum
{
	ON_CHIP_CLK = 0x0,
	EXTERNAL_CLK,
	INVALID_CLK_SOURCE
} IxSspAccClkSource;

/**
 * @ingroup IxSspAcc
 * 
 * @enum IxSspAccSpiSclkPhase
 *
 * @brief The SPI SCLK Phase: 
 * 0 - SCLK is inactive one cycle at the start of a frame and 1/2 cycle at the
 *		end of a frame.
 * 1 - SCLK is inactive 1/2 cycle at the start of a frame and one cycle at the
 *		end of a frame.
 */
typedef enum
{
	START_ONE_END_HALF = 0x0,
	START_HALF_END_ONE,
	INVALID_SPI_PHASE
} IxSspAccSpiSclkPhase;

/**
 * @ingroup IxSspAcc
 * 
 * @enum IxSspAccSpiSclkPolarity
 *
 * @brief The SPI SCLK Polarity can be set to either low or high.
 */
typedef enum
{
	SPI_POLARITY_LOW = 0x0,
	SPI_POLARITY_HIGH,
	INVALID_SPI_POLARITY
} IxSspAccSpiSclkPolarity;

/**
 * @ingroup IxSspAcc
 * 
 * @enum IxSspAccMicrowireCtlWord
 *
 * @brief The Microwire control word can be either 8 or 16 bit.
 */
typedef enum
{
	MICROWIRE_8_BIT = 0x0,
	MICROWIRE_16_BIT,
	INVALID_MICROWIRE_CTL_WORD
} IxSspAccMicrowireCtlWord;

/**
 * @ingroup IxSspAcc
 * 
 * @enum IxSspAccFifoThreshold
 *
 * @brief The threshold in frames (each frame is defined by IxSspAccDataSize)
 *			that can be set for the FIFO to trigger a threshold exceed when
 *			checking with the ExceedThresholdCheck functions or an interrupt
 *			when it is enabled.
 */
typedef enum
{
	FIFO_TSHLD_1 =	0x0,
	FIFO_TSHLD_2,
	FIFO_TSHLD_3,
	FIFO_TSHLD_4,
	FIFO_TSHLD_5,
	FIFO_TSHLD_6,
	FIFO_TSHLD_7,
	FIFO_TSHLD_8,
	FIFO_TSHLD_9,
	FIFO_TSHLD_10,
	FIFO_TSHLD_11,
	FIFO_TSHLD_12,
	FIFO_TSHLD_13,
	FIFO_TSHLD_14,
	FIFO_TSHLD_15,
	FIFO_TSHLD_16,
	INVALID_FIFO_TSHLD
} IxSspAccFifoThreshold;

/**
 * @ingroup IxSspAcc
 * 
 * @enum IX_SSP_STATUS
 *
 * @brief The statuses that can be returned in a SSP Serial Port Access
 */
typedef enum
{
	IX_SSP_SUCCESS = IX_SUCCESS, /**< Success status */
	IX_SSP_FAIL, /**< Fail status */
	IX_SSP_RX_FIFO_OVERRUN_HANDLER_MISSING, /**<
						Rx FIFO Overrun handler is NULL. */
	IX_SSP_RX_FIFO_HANDLER_MISSING, /**<
					Rx FIFO threshold hit or above handler is NULL
					*/
	IX_SSP_TX_FIFO_HANDLER_MISSING, /**<
					Tx FIFO threshold hit or below handler is NULL
					*/
	IX_SSP_FIFO_NOT_EMPTY_FOR_SETTING_CTL_CMD, /**<
					Tx FIFO not empty and therefore microwire
					control command size setting is not allowed.	*/
	IX_SSP_INVALID_FRAME_FORMAT_ENUM_VALUE, /**<
					frame format selected is invalid. */
	IX_SSP_INVALID_DATA_SIZE_ENUM_VALUE, /**<
					data size selected is invalid. */
	IX_SSP_INVALID_CLOCK_SOURCE_ENUM_VALUE, /**<
					source clock selected is invalid. */
	IX_SSP_INVALID_TX_FIFO_THRESHOLD_ENUM_VALUE, /**<
					Tx FIFO threshold selected is invalid. */
	IX_SSP_INVALID_RX_FIFO_THRESHOLD_ENUM_VALUE, /**<
					Rx FIFO threshold selected is invalid. */
	IX_SSP_INVALID_SPI_PHASE_ENUM_VALUE, /**<
					SPI phase selected is invalid. */
	IX_SSP_INVALID_SPI_POLARITY_ENUM_VALUE, /**<
					SPI polarity selected is invalid. */
	IX_SSP_INVALID_MICROWIRE_CTL_CMD_ENUM_VALUE, /**<
					Microwire control command selected is invalid
					*/
	IX_SSP_INT_UNBIND_FAIL, /**< Interrupt unbind fail to unbind SSP
	                interrupt */
	IX_SSP_INT_BIND_FAIL, /**< Interrupt bind fail during init */
	IX_SSP_RX_FIFO_NOT_EMPTY, /**<
					Rx FIFO not empty while trying to change data
					size. */
	IX_SSP_TX_FIFO_NOT_EMPTY, /**<
					Rx FIFO not empty while trying to change data
					size or microwire control command size.	*/
	IX_SSP_POLL_MODE_BLOCKING, /**<
					poll mode selected blocks interrupt mode from
					being selected.	*/
	IX_SSP_TX_FIFO_HIT_BELOW_THRESHOLD, /**<
					Tx FIFO level hit or below threshold. */
	IX_SSP_TX_FIFO_EXCEED_THRESHOLD, /**<
					Tx FIFO level exceeded threshold. */
	IX_SSP_RX_FIFO_HIT_ABOVE_THRESHOLD, /**<
					Rx FIFO level hit or exceeded threshold. */
	IX_SSP_RX_FIFO_BELOW_THRESHOLD, /**<
					Rx FIFO level below threshold. */
	IX_SSP_BUSY, /**< SSP is busy. */
	IX_SSP_IDLE, /**< SSP is idle. */
	IX_SSP_OVERRUN_OCCURRED, /**<
					SSP has experienced an overrun. */
	IX_SSP_NO_OVERRUN, /**<
					SSP did not experience an overrun. */
	IX_SSP_NOT_SUPORTED, /**< hardware does not support SSP */
	IX_SSP_NOT_INIT, /**< SSP Access not intialized */
	IX_SSP_NULL_POINTER /**< parameter passed in is NULL */
} IX_SSP_STATUS;

/**
 * @ingroup IxSspAcc
 *
 * @brief SSP Rx FIFO Overrun handler
 *
 * This function is called for the client to handle Rx FIFO Overrun that occurs
 * in the SSP hardware
 */
typedef void (*RxFIFOOverrunHandler)(void);

/**
 * @ingroup IxSspAcc
 * 
 * @brief SSP Rx FIFO Threshold hit or above handler
 *
 * This function is called for the client to handle Rx FIFO threshold hit or
 * or above that occurs in the SSP hardware
 */
typedef void (*RxFIFOThresholdHandler)(void);

/**
 * @ingroup IxSspAcc
 * 
 * @brief SSP Tx FIFO Threshold hit or below handler
 *
 * This function is called for the client to handle Tx FIFO threshold hit or
 * or below that occurs in the SSP hardware
 */
typedef void (*TxFIFOThresholdHandler)(void);


/*
 * Section for struct
 */
/**
 * @ingroup IxSspAcc
 *
 * @brief contains all the variables required to initialize the SSP serial port
 *		hardware.
 * 
 * Structure to be filled and used for calling initialization
 */
typedef struct
{
	IxSspAccFrameFormat FrameFormatSelected;/**<Select between SPI, SSP and
												Microwire. */
	IxSspAccDataSize DataSizeSelected;		/**<Select between 4 and 16. */
	IxSspAccClkSource ClkSourceSelected;	/**<Select clock source to be
												on-chip or external. */
	IxSspAccFifoThreshold TxFIFOThresholdSelected;
											/**<Select Tx FIFO threshold
												between 1 to 16. */
	IxSspAccFifoThreshold RxFIFOThresholdSelected;
											/**<Select Rx FIFO threshold
												between 1 to 16. */
	BOOL RxFIFOIntrEnable;					/**<Enable/disable Rx FIFO
												threshold interrupt. Disabling
												this interrupt will require
												the use of the polling function
												RxFIFOExceedThresholdCheck. */
	BOOL TxFIFOIntrEnable;					/**<Enable/disable Tx FIFO
												threshold interrupt. Disabling
												this interrupt will require
												the use of the polling function
												TxFIFOExceedThresholdCheck. */
	RxFIFOThresholdHandler RxFIFOThsldHdlr;	/**<Pointer to function to handle
												a Rx FIFO interrupt. */
	TxFIFOThresholdHandler TxFIFOThsldHdlr;	/**<Pointer to function to handle
												a Tx FIFO interrupt. */
	RxFIFOOverrunHandler RxFIFOOverrunHdlr;	/**<Pointer to function to handle
												a Rx FIFO overrun interrupt. */
	BOOL LoopbackEnable;					/**<Select operation mode to be
												normal or loopback mode. */
	IxSspAccSpiSclkPhase SpiSclkPhaseSelected;
											/**<Select SPI SCLK phase to start
												with one inactive cycle and end
												with 1/2 inactive cycle or
												start with 1/2 inactive cycle
												and end with one inactive
												cycle. (Only used in
												SPI format). */
	IxSspAccSpiSclkPolarity SpiSclkPolaritySelected;
											/**<Select SPI SCLK idle state
												to be low or high. (Only used in
												SPI format). */
	IxSspAccMicrowireCtlWord MicrowireCtlWordSelected;
											/**<Select Microwire control
												format to be 8 or 16-bit. (Only
												used in Microwire format). */
	UINT8 SerialClkRateSelected;			/**<Select between 0 (1.8432Mbps)
												and 255 (7.2Kbps). The
												formula used is	Bit rate = 
												3.6864x10^6 / 
												(2 x (SerialClkRateSelect + 1))
												*/
} IxSspInitVars;

/**
 * @ingroup IxSspAcc
 *
 * @brief contains counters of the SSP statistics
 * 
 * Structure contains all values of counters and associated overflows.
 */
typedef struct
{
	UINT32 ixSspRcvCounter;		/**<Total frames received. */
	UINT32 ixSspXmitCounter;	/**<Total frames transmitted. */
	UINT32 ixSspOverflowCounter;/**<Total occurrences of overflow. */
} IxSspAccStatsCounters;


/*
 * Section for prototypes interface functions
 */

/**
 * @ingroup IxSspAcc
 * 
 * @fn ixSspAccInit (
	IxSspInitVars *initVarsSelected);
 *
 * @brief Initializes the SSP Access module.
 *
 * @param "IxSspAccInitVars [in] *initVarsSelected" - struct containing required
 *			variables for initialization 
 *
 * Global Data	:
 *		- None.
 *                        
 * This API will initialize the SSP Serial Port hardware to the user specified
 * configuration. Then it will enable the SSP Serial Port.
 * *NOTE*: Once interrupt or polling mode is selected, the mode cannot be
 * changed via the interrupt enable/disable function but the init needs to be
 * called again to change it.
 *
 * @return 
 *      - IX_SSP_SUCCESS - Successfully initialize and enable the SSP
 *									serial port.
 *		- IX_SSP_RX_FIFO_HANDLER_MISSING - interrupt mode is selected but RX FIFO
 *									handler pointer is NULL
 *		- IX_SSP_TX_FIFO_HANDLER_MISSING - interrupt mode is selected but TX FIFO
 *									handler pointer is NULL
 *		- IX_SSP_RX_FIFO_OVERRUN_HANDLER_MISSING - interrupt mode is selected but
 *									RX FIFO Overrun handler pointer is NULL