obj_svcdataflash.c

AT91rm9200的引导代码

//*---------------------------------------------------------------------------
//*      ATMEL Microcontroller Software Support  -  ROUSSET  -
//*---------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*-----------------------------------------------------------------------------
//* File Name           : obj_svcdataflash.c
//* Object              : Atmel AT45DBxxx DataFlash service.
//*
//* 1.0 14/01/02 HI     : Creation
//* 1.2 08/10/02 FB HI  : New structure
//*---------------------------------------------------------------------------

#include "services\obj_romboot.h"
#include "services\obj_svcdataflash.h"

#define AT91C_SPI_RXBUFF     ((unsigned int) 0x1 <<  6) 
#define AT91C_SPI_TXBUFE     ((unsigned int) 0x1 <<  7)

//*-----------------------------------------------------------------------------
//* Function Name       : AT91F_SpiWrite
//* Object              : set the PDC registers for a transfert
//* Input Parameters    : DataFlash Descriptor
//* Output Parameters   : none
//* Functions called    : none
//*-----------------------------------------------------------------------------
static void AT91F_SpiWrite ( AT91PS_DataflashDesc pDesc )
{ 	
   	pDesc->state = BUSY;
   	
   	//* Initialize the Transmit and Receive Pointer
    SPI_BASE->SP_RPR = (u_int)pDesc->rx_cmd_pt ;
    SPI_BASE->SP_TPR = (u_int)pDesc->tx_cmd_pt ;

    //* Intialize the Transmit and Receive Counters
    SPI_BASE->SP_RCR = pDesc->rx_cmd_size ;
    SPI_BASE->SP_TCR = pDesc->tx_cmd_size ;

	if ( pDesc->tx_data_size != 0 )
   	{
	   	//* Initialize the Next Transmit and Next Receive Pointer
    	SPI_BASE->SP_RNPR = (u_int)pDesc->rx_data_pt ;
	    SPI_BASE->SP_TNPR = (u_int)pDesc->tx_data_pt ;

		//* Intialize the Next Transmit and Next Receive Counters
	    SPI_BASE->SP_RNCR = pDesc->rx_data_size ;
	    SPI_BASE->SP_TNCR = pDesc->tx_data_size ;
   	}
      	
   	//* Enable RXBUFF Interrupt
    SPI_BASE->SP_IER = AT91C_SPI_RXBUFF;
    
   	SPI_BASE->SP_PTCR = PDC_TXTEN + PDC_RXTEN;

}

//*-----------------------------------------------------------------------------
//* Function Name       : AT91F_DataFlashHandler
//* Object              : SPI Fixed Peripheral C interrupt handler.
//* Input Parameters    : DataFlash Service, status parameter
//* Output Parameters   : none
//* Functions called    : none
//*-----------------------------------------------------------------------------
void AT91F_DataFlashHandler(
	AT91PS_SvcDataFlash pSvcDataFlash,
	u_int status)
{
	AT91PS_DataflashDesc  pDesc = (AT91PS_DataflashDesc) &(pSvcDataFlash->DataFlashDesc) ;

	//* If End of Receive Transfer interrupt occurred
    if (( status & AT91C_SPI_RXBUFF))
    {            
	    if( pDesc->state == BUSY)
        {
       		//* Next State
			pDesc->state = IDLE;
		
			if (pDesc->DataFlash_state == GET_STATUS)
				pDesc->DataFlash_state = *( (u_char *) (pDesc->rx_cmd_pt) +1);
        
        	//* Disable the Transmit Interrupt
        	SPI_BASE->SP_IDR = AT91C_SPI_RXBUFF;
        	SPI_BASE->SP_PTCR = PDC_TXTDIS + PDC_RXTDIS;
        	return;
    	}	
    }          		
	pDesc->state = ERROR;
	SPI_BASE->SP_PTCR = PDC_TXTDIS + PDC_RXTDIS;         
	SPI_BASE->SP_IDR = status;
}

//*-----------------------------------------------------------------------------
//* Function Name       : AT91F_OpenSvcDataFlash
//* Object              : Open the DataFlash service
//* Input Parameters    : DataFlash Service , APMC Base
//* Output Parameters   : The service structure initialized
//* Functions called    : none
//*-----------------------------------------------------------------------------
AT91PS_SvcDataFlash AT91F_OpenSvcDataFlash (
	const AT91PS_APMC pApmc,
	AT91PS_SvcDataFlash pSvcDataFlash)
{
	pSvcDataFlash->Handler						= AT91F_DataFlashHandler;
	pSvcDataFlash->Status						= AT91F_DataFlashGetStatus;
	pSvcDataFlash->AbortCommand					= AT91F_DataFlashAbortCommand;
	pSvcDataFlash->PageRead						= AT91F_DataFlashPageRead;
	pSvcDataFlash->ContinuousRead				= AT91F_DataFlashContinuousRead;
	pSvcDataFlash->ReadBuffer					= AT91F_DataFlashReadBuffer;
	pSvcDataFlash->MainMemoryToBufferTransfert	= AT91F_MainMemoryToBufferTransfert;
	pSvcDataFlash->PagePgmBuf  					= AT91F_DataFlashPagePgmBuf;
	pSvcDataFlash->WriteBuffer 					= AT91F_DataFlashWriteBuffer;
	pSvcDataFlash->WriteBufferToMain			= AT91F_WriteBufferToMain;
	pSvcDataFlash->PageErase    				= AT91F_PageErase;
	pSvcDataFlash->BlockErase    				= AT91F_BlockErase;
	pSvcDataFlash->MainMemoryToBufferCompare   	= AT91F_MainMemoryToBufferCompare;
	
	return pSvcDataFlash;
}

//*-----------------------------------------------------------------------------
//* Function Name       : AT91F_DataFlashAbortCommand
//* Object              : Allows to reset PDC & Interrupts
//* Input Parameters    : DataFlash Descriptor
//* Return value		: none
//*-----------------------------------------------------------------------------
void AT91F_DataFlashAbortCommand(AT91PS_DataflashDesc pDesc)
{
	int status;
	
	status = ( SPI_BASE->SP_SR & SPI_BASE->SP_IMR );
	
	pDesc->state = IDLE;
	SPI_BASE->SP_PTCR = PDC_TXTDIS + PDC_RXTDIS;         
	SPI_BASE->SP_IDR = status;
}
//*-----------------------------------------------------------------------------
//* Function Name       : AT91F_DataFlashGetStatus
//* Object              : Read the status register of the dataflash
//* Input Parameters    : DataFlash Descriptor
//* Return value		: State of the dataflash
//*-----------------------------------------------------------------------------
AT91S_SvcDataFlashStatus AT91F_DataFlashGetStatus(AT91PS_DataflashDesc pDesc)
{
	//* if a transfert is in progress ==> return 0	
	if( (pDesc->state) != IDLE)
		return DATAFLASH_BUSY;
		
	//* first send the read status command (D7H)
	pDesc->command[0] = DB_STATUS;
	pDesc->command[1] = 0;
	
	pDesc->DataFlash_state  = GET_STATUS;
    pDesc->tx_data_size 	= 0 ;	//* Transmit the command and receive response
    pDesc->tx_cmd_pt 		= pDesc->command ;
    pDesc->rx_cmd_pt 		= pDesc->command ;
    pDesc->rx_cmd_size 		= 2 ;
    pDesc->tx_cmd_size 		= 2 ;
    AT91F_SpiWrite (pDesc);
	
	return DATAFLASH_OK;
}

//*-----------------------------------------------------------------------------
//* Function Name       : AT91F_DataFlashSendCommand
//* Object              : Generic function to send a command to the dataflash
//* Input Parameters    : DataFlash Service
//*						: <OpCode>  = command operation code
//*                     : <CmdSize> = size of the command
//*                     : <DataflashAddress> =  address associate to the command
//* Return value		: State of the dataflash
//*-----------------------------------------------------------------------------
AT91S_SvcDataFlashStatus AT91F_DataFlashSendCommand (
	AT91PS_SvcDataFlash pSvcDataFlash,
	u_char OpCode,
	u_int CmdSize,
	u_int DataflashAddress)
{
    u_int adr;

	if ( (pSvcDataFlash->DataFlashDesc.state) != IDLE)
		return DATAFLASH_BUSY;
				
	//* process the address to obtain page address and byte address
    adr = ((DataflashAddress / (pSvcDataFlash->pDevice->pages_size)) << pSvcDataFlash->pDevice->page_offset) + (DataflashAddress % (pSvcDataFlash->pDevice->pages_size));

	//* fill the  command  buffer */
    pSvcDataFlash->DataFlashDesc.command[0] = OpCode;
    pSvcDataFlash->DataFlashDesc.command[1] = (u_char)((adr & 0x00FF0000) >> 16);
    pSvcDataFlash->DataFlashDesc.command[2] = (u_char)((adr & 0x0000FF00) >> 8);
    pSvcDataFlash->DataFlashDesc.command[3] = (u_char)(adr & 0x000000FF) ;
    pSvcDataFlash->DataFlashDesc.command[4] = 0;
    pSvcDataFlash->DataFlashDesc.command[5] = 0;
    pSvcDataFlash->DataFlashDesc.command[6] = 0;
    pSvcDataFlash->DataFlashDesc.command[7] = 0;
    
	/* Initialize the SpiData structure for the spi write fuction */
    pSvcDataFlash->DataFlashDesc.tx_cmd_pt 	 =  pSvcDataFlash->DataFlashDesc.command ;	
    pSvcDataFlash->DataFlashDesc.tx_cmd_size =  CmdSize ;
    pSvcDataFlash->DataFlashDesc.rx_cmd_pt 	 =  pSvcDataFlash->DataFlashDesc.command ;
    pSvcDataFlash->DataFlashDesc.rx_cmd_size =  CmdSize ;

	/* send the command and read the data */
    AT91F_SpiWrite (&(pSvcDataFlash->DataFlashDesc));

	return DATAFLASH_OK;
}

///////////////////////////////////////////////////////////////////////////////////////////
//	Read Functions
///////////////////////////////////////////////////////////////////////////////////////////

//*-----------------------------------------------------------------------------
//* Function Name       : AT91F_DataFlashPageRead
//* Object              : Main memory page read
//* Input Parameters    : DataFlash Service
//*						: <src>  = dataflash address 
//*                     : <*dataBuffer> = data buffer pointer
//*                     : <sizeToRead> = Number of bytes to read
//* Return value		: State of the dataflash
//*-----------------------------------------------------------------------------
AT91S_SvcDataFlashStatus AT91F_DataFlashPageRead (
	AT91PS_SvcDataFlash pSvcDataFlash,
	u_int src,
	u_char *dataBuffer,
	int sizeToRead )
{
    pSvcDataFlash->DataFlashDesc.rx_data_pt = dataBuffer ;	/* buffer for the read operation*/
    pSvcDataFlash->DataFlashDesc.rx_data_size = sizeToRead;	/* Number of byte to read */
    pSvcDataFlash->DataFlashDesc.tx_data_pt = dataBuffer ;
    pSvcDataFlash->DataFlashDesc.tx_data_size = sizeToRead;

	/* Send the command to the dataflash */
	return (AT91F_DataFlashSendCommand (pSvcDataFlash, DB_PAGE_READ, 8, src));
}

//*-----------------------------------------------------------------------------
//* Function Name       : AT91F_DataFlashContinuousRead 
//* Object              : Continuous stream Read 
//* Input Parameters    : DataFlash Service
//*						: <src> = dataflash address
//*                     : <*dataBuffer> = data buffer pointer
//*                     : <sizeToRead> = data buffer size
//* Return value		: State of the dataflash
//*-----------------------------------------------------------------------------
AT91S_SvcDataFlashStatus AT91F_DataFlashContinuousRead (
 	AT91PS_SvcDataFlash pSvcDataFlash,
	int src,
	u_char *dataBuffer,
	int sizeToRead )
{
	//* Test the size to read in the device
    if ( (src + sizeToRead) > (pSvcDataFlash->pDevice->pages_size * (pSvcDataFlash->pDevice->pages_number)))
		return DATAFLASH_MEMORY_OVERFLOW;

    pSvcDataFlash->DataFlashDesc.rx_data_pt = dataBuffer;