drivers/at45.c - platform/external/u-boot - Gitiles

 /* Driver for ATMEL DataFlash support
  * Author : Hamid Ikdoumi (Atmel)
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2 of
  * the License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  * MA 02111-1307 USA
  *
  */

 #include <config.h>
 #include <common.h>

 #ifdef CONFIG_HAS_DATAFLASH
 #include <dataflash.h>

 /*
  * spi.c API
  */
 extern unsigned int	AT91F_SpiWrite (AT91PS_DataflashDesc pDesc);
 extern void 		AT91F_SpiEnable(int cs);

 #define AT91C_TIMEOUT_WRDY			200000


 /*----------------------------------------------------------------------*/
 /* \fn    AT91F_DataFlashSendCommand					*/
 /* \brief Generic function to send a command to the dataflash		*/
 /*----------------------------------------------------------------------*/
 AT91S_DataFlashStatus AT91F_DataFlashSendCommand(
 	AT91PS_DataFlash pDataFlash,
 	unsigned char OpCode,
 	unsigned int CmdSize,
 	unsigned int DataflashAddress)
 {
 	unsigned int adr;

 	if ( (pDataFlash->pDataFlashDesc->state) != IDLE)
 		return DATAFLASH_BUSY;

 	/* process the address to obtain page address and byte address */
 	adr = ((DataflashAddress / (pDataFlash->pDevice->pages_size)) <<
 		pDataFlash->pDevice->page_offset) + (DataflashAddress %
 		(pDataFlash->pDevice->pages_size));

 	/* fill the  command  buffer */
 	pDataFlash->pDataFlashDesc->command[0] = OpCode;
 	if (pDataFlash->pDevice->pages_number >= 16384) {
 		pDataFlash->pDataFlashDesc->command[1] =
 			(unsigned char)((adr & 0x0F000000) >> 24);
 		pDataFlash->pDataFlashDesc->command[2] =
 			(unsigned char)((adr & 0x00FF0000) >> 16);
 		pDataFlash->pDataFlashDesc->command[3] =
 			(unsigned char)((adr & 0x0000FF00) >> 8);
 		pDataFlash->pDataFlashDesc->command[4] =
 			(unsigned char)(adr & 0x000000FF);
 	} else {
 		pDataFlash->pDataFlashDesc->command[1] =
 			(unsigned char)((adr & 0x00FF0000) >> 16);
 		pDataFlash->pDataFlashDesc->command[2] =
 			(unsigned char)((adr & 0x0000FF00) >> 8);
 		pDataFlash->pDataFlashDesc->command[3] =
 			(unsigned char)(adr & 0x000000FF);
 		pDataFlash->pDataFlashDesc->command[4] = 0;
 	}
 	pDataFlash->pDataFlashDesc->command[5] = 0;
 	pDataFlash->pDataFlashDesc->command[6] = 0;
 	pDataFlash->pDataFlashDesc->command[7] = 0;

 	/* Initialize the SpiData structure for the spi write fuction */
 	pDataFlash->pDataFlashDesc->tx_cmd_pt   =
 		pDataFlash->pDataFlashDesc->command;
 	pDataFlash->pDataFlashDesc->tx_cmd_size =  CmdSize;
 	pDataFlash->pDataFlashDesc->rx_cmd_pt   =
 		pDataFlash->pDataFlashDesc->command;
 	pDataFlash->pDataFlashDesc->rx_cmd_size =  CmdSize;

 	/* send the command and read the data */
 	return AT91F_SpiWrite (pDataFlash->pDataFlashDesc); }


 /*----------------------------------------------------------------------*/
 /* \fn    AT91F_DataFlashGetStatus					*/
 /* \brief Read the status register of the dataflash			*/
 /*----------------------------------------------------------------------*/
 AT91S_DataFlashStatus AT91F_DataFlashGetStatus(AT91PS_DataflashDesc pDesc)
 {
 	AT91S_DataFlashStatus status;

 	/* 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;
 	status = AT91F_SpiWrite (pDesc);

 	pDesc->DataFlash_state = *( (unsigned char *) (pDesc->rx_cmd_pt) +1);

 	return status;
 }


 /*----------------------------------------------------------------------*/
 /* \fn    AT91F_DataFlashWaitReady					*/
 /* \brief wait for dataflash ready (bit7 of the status register == 1)	*/
 /*----------------------------------------------------------------------*/
 AT91S_DataFlashStatus AT91F_DataFlashWaitReady(AT91PS_DataflashDesc
 pDataFlashDesc, unsigned int timeout)
 {
 	pDataFlashDesc->DataFlash_state = IDLE;

 	do {
 		AT91F_DataFlashGetStatus(pDataFlashDesc);
 		timeout--;
 	} while( ((pDataFlashDesc->DataFlash_state & 0x80) != 0x80) &&
 			(timeout > 0) );

 	if((pDataFlashDesc->DataFlash_state & 0x80) != 0x80)
 		return DATAFLASH_ERROR;

 	return DATAFLASH_OK;
 }


 /*--------------------------------------------------------------------------*/
 /* 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_DataFlashStatus AT91F_DataFlashContinuousRead (
 	AT91PS_DataFlash pDataFlash,
 	int src,
 	unsigned char *dataBuffer,
 	int sizeToRead )
 {
 	AT91S_DataFlashStatus status;
 	/* Test the size to read in the device */
 	if ( (src + sizeToRead) >
 		(pDataFlash->pDevice->pages_size *
 		(pDataFlash->pDevice->pages_number)))
 		return DATAFLASH_MEMORY_OVERFLOW;

 	pDataFlash->pDataFlashDesc->rx_data_pt = dataBuffer;
 	pDataFlash->pDataFlashDesc->rx_data_size = sizeToRead;
 	pDataFlash->pDataFlashDesc->tx_data_pt = dataBuffer;
 	pDataFlash->pDataFlashDesc->tx_data_size = sizeToRead;

 	status = AT91F_DataFlashSendCommand
 			(pDataFlash, DB_CONTINUOUS_ARRAY_READ, 8, src);
 	/* Send the command to the dataflash */
 	return(status);
 }


 /*---------------------------------------------------------------------------*/
 /* Function Name       : AT91F_DataFlashPagePgmBuf			     */
 /* Object              : Main memory page program thru buffer 1 or buffer 2  */
 /* Input Parameters    : DataFlash Service				     */
 /*						: <*src> = Source buffer     */
 /*                     : <dest> = dataflash destination address		     */
 /*                     : <SizeToWrite> = data buffer size		     */
 /* Return value		: State of the dataflash			     */
 /*---------------------------------------------------------------------------*/
 AT91S_DataFlashStatus AT91F_DataFlashPagePgmBuf(
 	AT91PS_DataFlash pDataFlash,
 	unsigned char *src,
 	unsigned int dest,
 	unsigned int SizeToWrite)
 {
 	int cmdsize;
 	pDataFlash->pDataFlashDesc->tx_data_pt = src;
 	pDataFlash->pDataFlashDesc->tx_data_size = SizeToWrite;
 	pDataFlash->pDataFlashDesc->rx_data_pt = src;
 	pDataFlash->pDataFlashDesc->rx_data_size = SizeToWrite;

 	cmdsize = 4;
 	/* Send the command to the dataflash */
 	if (pDataFlash->pDevice->pages_number >= 16384)
 		cmdsize = 5;
 	return(AT91F_DataFlashSendCommand (pDataFlash, DB_PAGE_PGM_BUF1,
 cmdsize, dest)); }


 /*---------------------------------------------------------------------------*/
 /* Function Name       : AT91F_MainMemoryToBufferTransfert		     */
 /* Object              : Read a page in the SRAM Buffer 1 or 2		     */
 /* Input Parameters    : DataFlash Service				     */
 /*                     : Page concerned					     */
 /*                     : 						     */
 /* Return value		: State of the dataflash			     */
 /*---------------------------------------------------------------------------*/
 AT91S_DataFlashStatus AT91F_MainMemoryToBufferTransfert(
 	AT91PS_DataFlash pDataFlash,
 	unsigned char BufferCommand,
 	unsigned int page)
 {
 	int cmdsize;
 	/* Test if the buffer command is legal */
 	if ((BufferCommand != DB_PAGE_2_BUF1_TRF)
 		&& (BufferCommand != DB_PAGE_2_BUF2_TRF))
 		return DATAFLASH_BAD_COMMAND;

 	/* no data to transmit or receive */
 	pDataFlash->pDataFlashDesc->tx_data_size = 0;
 	cmdsize = 4;
 	if (pDataFlash->pDevice->pages_number >= 16384)
 		cmdsize = 5;
 	return(AT91F_DataFlashSendCommand (pDataFlash, BufferCommand, cmdsize,
 page*pDataFlash->pDevice->pages_size));
 }


 /*-------------------------------------------------------------------------- */
 /* Function Name       : AT91F_DataFlashWriteBuffer			     */
 /* Object              : Write data to the internal sram buffer 1 or 2	     */
 /* Input Parameters    : DataFlash Service				     */
 /*			: <BufferCommand> = command to write buffer1 or 2    */
 /*                     : <*dataBuffer> = data buffer to write		     */
 /*                     : <bufferAddress> = address in the internal buffer    */
 /*                     : <SizeToWrite> = data buffer size		     */
 /* Return value		: State of the dataflash			     */
 /*---------------------------------------------------------------------------*/
 AT91S_DataFlashStatus AT91F_DataFlashWriteBuffer (
 	AT91PS_DataFlash pDataFlash,
 	unsigned char BufferCommand,
 	unsigned char *dataBuffer,
 	unsigned int bufferAddress,
 	int SizeToWrite )
 {
 	int cmdsize;
 	/* Test if the buffer command is legal */
 	if ((BufferCommand != DB_BUF1_WRITE)
 		&& (BufferCommand != DB_BUF2_WRITE))
 		return DATAFLASH_BAD_COMMAND;

 	/* buffer address must be lower than page size */
 	if (bufferAddress > pDataFlash->pDevice->pages_size)
 		return DATAFLASH_BAD_ADDRESS;

 	if ( (pDataFlash->pDataFlashDesc->state)  != IDLE)
 		return DATAFLASH_BUSY;

 	/* Send first Write Command */
 	pDataFlash->pDataFlashDesc->command[0] = BufferCommand;
 	pDataFlash->pDataFlashDesc->command[1] = 0;
 	if (pDataFlash->pDevice->pages_number >= 16384) {
 	    	pDataFlash->pDataFlashDesc->command[2] = 0;
 	    	pDataFlash->pDataFlashDesc->command[3] =
 			(unsigned char)(((unsigned int)(bufferAddress &
 				pDataFlash->pDevice->byte_mask)) >> 8);
 	    	pDataFlash->pDataFlashDesc->command[4] =
 			(unsigned char)((unsigned int)bufferAddress  & 0x00FF);
 		cmdsize = 5;
 	} else {
 	    	pDataFlash->pDataFlashDesc->command[2] =
 			(unsigned char)(((unsigned int)(bufferAddress &
 				pDataFlash->pDevice->byte_mask)) >> 8);
 	    	pDataFlash->pDataFlashDesc->command[3] =
 			(unsigned char)((unsigned int)bufferAddress  & 0x00FF);
 	    	pDataFlash->pDataFlashDesc->command[4] = 0;
 		cmdsize = 4;
 	}

 	pDataFlash->pDataFlashDesc->tx_cmd_pt 	 =
 		pDataFlash->pDataFlashDesc->command;
 	pDataFlash->pDataFlashDesc->tx_cmd_size = cmdsize;
 	pDataFlash->pDataFlashDesc->rx_cmd_pt 	 =
 		pDataFlash->pDataFlashDesc->command;
 	pDataFlash->pDataFlashDesc->rx_cmd_size = cmdsize;

 	pDataFlash->pDataFlashDesc->rx_data_pt 	= dataBuffer;
 	pDataFlash->pDataFlashDesc->tx_data_pt 	= dataBuffer;
 	pDataFlash->pDataFlashDesc->rx_data_size 	= SizeToWrite;
 	pDataFlash->pDataFlashDesc->tx_data_size 	= SizeToWrite;

 	return AT91F_SpiWrite(pDataFlash->pDataFlashDesc);
 }

 /*---------------------------------------------------------------------------*/
 /* Function Name       : AT91F_PageErase                                     */
 /* Object              : Erase a page 					     */
 /* Input Parameters    : DataFlash Service				     */
 /*                     : Page concerned					     */
 /*                     : 						     */
 /* Return value		: State of the dataflash			     */
 /*---------------------------------------------------------------------------*/
 AT91S_DataFlashStatus AT91F_PageErase(
 	AT91PS_DataFlash pDataFlash,
 	unsigned int page)
 {
 	int cmdsize;
 	/* Test if the buffer command is legal */
 	/* no data to transmit or receive */
     	pDataFlash->pDataFlashDesc->tx_data_size = 0;

 	cmdsize = 4;
 	if (pDataFlash->pDevice->pages_number >= 16384)
 		cmdsize = 5;
 	return(AT91F_DataFlashSendCommand (pDataFlash, DB_PAGE_ERASE, cmdsize,
 page*pDataFlash->pDevice->pages_size));
 }


 /*---------------------------------------------------------------------------*/
 /* Function Name       : AT91F_BlockErase                                    */
 /* Object              : Erase a Block 					     */
 /* Input Parameters    : DataFlash Service				     */
 /*                     : Page concerned					     */
 /*                     : 						     */
 /* Return value		: State of the dataflash			     */
 /*---------------------------------------------------------------------------*/
 AT91S_DataFlashStatus AT91F_BlockErase(
 	AT91PS_DataFlash pDataFlash,
 	unsigned int block)
 {
 	int cmdsize;
 	/* Test if the buffer command is legal */
 	/* no data to transmit or receive */
     	pDataFlash->pDataFlashDesc->tx_data_size = 0;
 	cmdsize = 4;
 	if (pDataFlash->pDevice->pages_number >= 16384)
 		cmdsize = 5;
 	return(AT91F_DataFlashSendCommand (pDataFlash, DB_BLOCK_ERASE,cmdsize,
 block*8*pDataFlash->pDevice->pages_size));
 }

 /*---------------------------------------------------------------------------*/
 /* Function Name       : AT91F_WriteBufferToMain			     */
 /* Object              : Write buffer to the main memory		     */
 /* Input Parameters    : DataFlash Service				     */
 /*		: <BufferCommand> = command to send to buffer1 or buffer2    */
 /*                     : <dest> = main memory address			     */
 /* Return value		: State of the dataflash			     */
 /*---------------------------------------------------------------------------*/
 AT91S_DataFlashStatus AT91F_WriteBufferToMain (
 	AT91PS_DataFlash pDataFlash,
 	unsigned char BufferCommand,
 	unsigned int dest )
 {
 	int cmdsize;
 	/* Test if the buffer command is correct */
 	if ((BufferCommand != DB_BUF1_PAGE_PGM) &&
 	    (BufferCommand != DB_BUF1_PAGE_ERASE_PGM) &&
 	    (BufferCommand != DB_BUF2_PAGE_PGM) &&
 	    (BufferCommand != DB_BUF2_PAGE_ERASE_PGM) )
 		return DATAFLASH_BAD_COMMAND;

 	/* no data to transmit or receive */
 	pDataFlash->pDataFlashDesc->tx_data_size = 0;

 	cmdsize = 4;
 	if (pDataFlash->pDevice->pages_number >= 16384)
 		cmdsize = 5;
 	/* Send the command to the dataflash */
 	return(AT91F_DataFlashSendCommand (pDataFlash, BufferCommand, cmdsize,
 						dest)); }


 /*---------------------------------------------------------------------------*/
 /* Function Name       : AT91F_PartialPageWrite				     */
 /* Object              : Erase partielly a page				     */
 /* Input Parameters    : <page> = page number				     */
 /*			: <AdrInpage> = adr to begin the fading		     */
 /*                     : <length> = Number of bytes to erase		     */
 /*---------------------------------------------------------------------------*/
 AT91S_DataFlashStatus AT91F_PartialPageWrite (
 	AT91PS_DataFlash pDataFlash,
 	unsigned char *src,
 	unsigned int dest,
 	unsigned int size)
 {
 	unsigned int page;
 	unsigned int AdrInPage;

 	page = dest / (pDataFlash->pDevice->pages_size);
 	AdrInPage = dest % (pDataFlash->pDevice->pages_size);

 	/* Read the contents of the page in the Sram Buffer */
 	AT91F_MainMemoryToBufferTransfert(pDataFlash,
 						DB_PAGE_2_BUF1_TRF, page);
 	AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 						AT91C_TIMEOUT_WRDY);
 	/*Update the SRAM buffer */
 	AT91F_DataFlashWriteBuffer(pDataFlash, DB_BUF1_WRITE, src,
 					AdrInPage, size);

 	AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 					AT91C_TIMEOUT_WRDY);

 	/* Erase page if a 128 Mbits device */
 	if (pDataFlash->pDevice->pages_number >= 16384) {
 		AT91F_PageErase(pDataFlash, page);
 		/* Rewrite the modified Sram Buffer in the main memory */
 		AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 						AT91C_TIMEOUT_WRDY);
 	}

 	/* Rewrite the modified Sram Buffer in the main memory */
 	return(AT91F_WriteBufferToMain(pDataFlash, DB_BUF1_PAGE_ERASE_PGM,
 				(page*pDataFlash->pDevice->pages_size)));
 }

 /*---------------------------------------------------------------------------*/
 /* Function Name       : AT91F_DataFlashWrite				     */
 /* Object              :						     */
 /* Input Parameters    : <*src> = Source buffer				     */
 /*                     : <dest> = dataflash adress			     */
 /*                     : <size> = data buffer size			     */
 /*---------------------------------------------------------------------------*/
 AT91S_DataFlashStatus AT91F_DataFlashWrite(
 	AT91PS_DataFlash pDataFlash,
 	unsigned char *src,
 	int dest,
 	int size )
 {
 	unsigned int length;
 	unsigned int page;
 	unsigned int status;

 	AT91F_SpiEnable(pDataFlash->pDevice->cs);

 	if ( (dest + size) > (pDataFlash->pDevice->pages_size *
 					(pDataFlash->pDevice->pages_number)))
 		return DATAFLASH_MEMORY_OVERFLOW;

 	/* If destination does not fit a page start address */
 	if ((dest % ((unsigned int)(pDataFlash->pDevice->pages_size)))  != 0 )
 	{
 		length = pDataFlash->pDevice->pages_size -
 				(dest %
 				((unsigned int)
 				(pDataFlash->pDevice->pages_size)));

 		if (size < length)
 			length = size;

 		if(!AT91F_PartialPageWrite(pDataFlash,src, dest, length))
 			return DATAFLASH_ERROR;

 		AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 			AT91C_TIMEOUT_WRDY);

 		/* Update size, source and destination pointers */
 		size -= length;
 		dest += length;
 		src += length;
 	}

 	while (( size - pDataFlash->pDevice->pages_size ) >= 0 ) {
 		/* program dataflash page */
 		page = (unsigned int)dest / (pDataFlash->pDevice->pages_size);

 		status = AT91F_DataFlashWriteBuffer(pDataFlash,
 				DB_BUF1_WRITE, src, 0,
 				pDataFlash->pDevice->pages_size);
 		AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 						AT91C_TIMEOUT_WRDY);

 		status = AT91F_PageErase(pDataFlash, page);
 		AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 						AT91C_TIMEOUT_WRDY);
 		if (!status)
 			return DATAFLASH_ERROR;

 		status = AT91F_WriteBufferToMain (pDataFlash,
 						DB_BUF1_PAGE_PGM, dest);
 		if(!status)
 			return DATAFLASH_ERROR;

 		AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 						AT91C_TIMEOUT_WRDY);

 		/* Update size, source and destination pointers */
 		size -= pDataFlash->pDevice->pages_size;
 		dest += pDataFlash->pDevice->pages_size;
 		src  += pDataFlash->pDevice->pages_size;
 	}

 	/* If still some bytes to read */
 	if ( size > 0 ) {
 		/* program dataflash page */
 		if(!AT91F_PartialPageWrite(pDataFlash, src, dest, size) )
 			return DATAFLASH_ERROR;

 		AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 						AT91C_TIMEOUT_WRDY);
 	}
 	return DATAFLASH_OK;
 }


 /*---------------------------------------------------------------------------*/
 /* Function Name       : AT91F_DataFlashRead 				     */
 /* Object              : Read a block in dataflash			     */
 /* Input Parameters    : 						     */
 /* Return value		: 						     */
 /*---------------------------------------------------------------------------*/
 int AT91F_DataFlashRead(
 	AT91PS_DataFlash pDataFlash,
 	unsigned long addr,
 	unsigned long size,
 	char *buffer)
 {
 	unsigned long SizeToRead;

 	AT91F_SpiEnable(pDataFlash->pDevice->cs);

 	if(AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 					AT91C_TIMEOUT_WRDY) != DATAFLASH_OK)
 		return -1;

 	while (size) {
 		SizeToRead = (size < 0x8000)? size:0x8000;

 		if (AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
 					AT91C_TIMEOUT_WRDY) != DATAFLASH_OK)
 			return -1;

 		if (AT91F_DataFlashContinuousRead (pDataFlash, addr,
 				(uchar *) buffer, SizeToRead) != DATAFLASH_OK)
 			return -1;

 		size -= SizeToRead;
 		addr += SizeToRead;
 		buffer += SizeToRead;
 	}

 	return DATAFLASH_OK;
 }

 /*---------------------------------------------------------------------------*/
 /* Function Name       : AT91F_DataflashProbe 				     */
 /* Object              : 						     */
 /* Input Parameters    : 						     */
 /* Return value	       : Dataflash status register			     */
 /*---------------------------------------------------------------------------*/
 int AT91F_DataflashProbe(int cs, AT91PS_DataflashDesc pDesc) {
 	AT91F_SpiEnable(cs);
 	AT91F_DataFlashGetStatus(pDesc);
 	return((pDesc->command[1] == 0xFF)? 0: pDesc->command[1] & 0x3C);
 }
 #endif
	/* Driver for ATMEL DataFlash support
	* Author : Hamid Ikdoumi (Atmel)
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation; either version 2 of
	* the License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	* MA 02111-1307 USA
	*
	*/

	#include <config.h>
	#include <common.h>

	#ifdef CONFIG_HAS_DATAFLASH
	#include <dataflash.h>

	/*
	* spi.c API
	*/
	extern unsigned int AT91F_SpiWrite (AT91PS_DataflashDesc pDesc);
	extern void AT91F_SpiEnable(int cs);

	#define AT91C_TIMEOUT_WRDY 200000


	/----------------------------------------------------------------------/
	/* \fn AT91F_DataFlashSendCommand */
	/* \brief Generic function to send a command to the dataflash */
	/----------------------------------------------------------------------/
	AT91S_DataFlashStatus AT91F_DataFlashSendCommand(
	AT91PS_DataFlash pDataFlash,
	unsigned char OpCode,
	unsigned int CmdSize,
	unsigned int DataflashAddress)
	{
	unsigned int adr;

	if ( (pDataFlash->pDataFlashDesc->state) != IDLE)
	return DATAFLASH_BUSY;

	/* process the address to obtain page address and byte address */
	adr = ((DataflashAddress / (pDataFlash->pDevice->pages_size)) <<
	pDataFlash->pDevice->page_offset) + (DataflashAddress %
	(pDataFlash->pDevice->pages_size));

	/* fill the command buffer */
	pDataFlash->pDataFlashDesc->command[0] = OpCode;
	if (pDataFlash->pDevice->pages_number >= 16384) {
	pDataFlash->pDataFlashDesc->command[1] =
	(unsigned char)((adr & 0x0F000000) >> 24);
	pDataFlash->pDataFlashDesc->command[2] =
	(unsigned char)((adr & 0x00FF0000) >> 16);
	pDataFlash->pDataFlashDesc->command[3] =
	(unsigned char)((adr & 0x0000FF00) >> 8);
	pDataFlash->pDataFlashDesc->command[4] =
	(unsigned char)(adr & 0x000000FF);
	} else {
	pDataFlash->pDataFlashDesc->command[1] =
	(unsigned char)((adr & 0x00FF0000) >> 16);
	pDataFlash->pDataFlashDesc->command[2] =
	(unsigned char)((adr & 0x0000FF00) >> 8);
	pDataFlash->pDataFlashDesc->command[3] =
	(unsigned char)(adr & 0x000000FF);
	pDataFlash->pDataFlashDesc->command[4] = 0;
	}
	pDataFlash->pDataFlashDesc->command[5] = 0;
	pDataFlash->pDataFlashDesc->command[6] = 0;
	pDataFlash->pDataFlashDesc->command[7] = 0;

	/* Initialize the SpiData structure for the spi write fuction */
	pDataFlash->pDataFlashDesc->tx_cmd_pt =
	pDataFlash->pDataFlashDesc->command;
	pDataFlash->pDataFlashDesc->tx_cmd_size = CmdSize;
	pDataFlash->pDataFlashDesc->rx_cmd_pt =
	pDataFlash->pDataFlashDesc->command;
	pDataFlash->pDataFlashDesc->rx_cmd_size = CmdSize;

	/* send the command and read the data */
	return AT91F_SpiWrite (pDataFlash->pDataFlashDesc); }


	/----------------------------------------------------------------------/
	/* \fn AT91F_DataFlashGetStatus */
	/* \brief Read the status register of the dataflash */
	/----------------------------------------------------------------------/
	AT91S_DataFlashStatus AT91F_DataFlashGetStatus(AT91PS_DataflashDesc pDesc)
	{
	AT91S_DataFlashStatus status;

	/* 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;
	status = AT91F_SpiWrite (pDesc);

	pDesc->DataFlash_state = ( (unsigned char ) (pDesc->rx_cmd_pt) +1);

	return status;
	}


	/----------------------------------------------------------------------/
	/* \fn AT91F_DataFlashWaitReady */
	/* \brief wait for dataflash ready (bit7 of the status register == 1) */
	/----------------------------------------------------------------------/
	AT91S_DataFlashStatus AT91F_DataFlashWaitReady(AT91PS_DataflashDesc
	pDataFlashDesc, unsigned int timeout)
	{
	pDataFlashDesc->DataFlash_state = IDLE;

	do {
	AT91F_DataFlashGetStatus(pDataFlashDesc);
	timeout--;
	} while( ((pDataFlashDesc->DataFlash_state & 0x80) != 0x80) &&
	(timeout > 0) );

	if((pDataFlashDesc->DataFlash_state & 0x80) != 0x80)
	return DATAFLASH_ERROR;

	return DATAFLASH_OK;
	}


	/--------------------------------------------------------------------------/
	/* 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_DataFlashStatus AT91F_DataFlashContinuousRead (
	AT91PS_DataFlash pDataFlash,
	int src,
	unsigned char *dataBuffer,
	int sizeToRead )
	{
	AT91S_DataFlashStatus status;
	/* Test the size to read in the device */
	if ( (src + sizeToRead) >
	(pDataFlash->pDevice->pages_size *
	(pDataFlash->pDevice->pages_number)))
	return DATAFLASH_MEMORY_OVERFLOW;

	pDataFlash->pDataFlashDesc->rx_data_pt = dataBuffer;
	pDataFlash->pDataFlashDesc->rx_data_size = sizeToRead;
	pDataFlash->pDataFlashDesc->tx_data_pt = dataBuffer;
	pDataFlash->pDataFlashDesc->tx_data_size = sizeToRead;

	status = AT91F_DataFlashSendCommand
	(pDataFlash, DB_CONTINUOUS_ARRAY_READ, 8, src);
	/* Send the command to the dataflash */
	return(status);
	}


	/---------------------------------------------------------------------------/
	/* Function Name : AT91F_DataFlashPagePgmBuf */
	/* Object : Main memory page program thru buffer 1 or buffer 2 */
	/* Input Parameters : DataFlash Service */
	/* : <src> = Source buffer /
	/* : <dest> = dataflash destination address */
	/* : <SizeToWrite> = data buffer size */
	/* Return value : State of the dataflash */
	/---------------------------------------------------------------------------/
	AT91S_DataFlashStatus AT91F_DataFlashPagePgmBuf(
	AT91PS_DataFlash pDataFlash,
	unsigned char *src,
	unsigned int dest,
	unsigned int SizeToWrite)
	{
	int cmdsize;
	pDataFlash->pDataFlashDesc->tx_data_pt = src;
	pDataFlash->pDataFlashDesc->tx_data_size = SizeToWrite;
	pDataFlash->pDataFlashDesc->rx_data_pt = src;
	pDataFlash->pDataFlashDesc->rx_data_size = SizeToWrite;

	cmdsize = 4;
	/* Send the command to the dataflash */
	if (pDataFlash->pDevice->pages_number >= 16384)
	cmdsize = 5;
	return(AT91F_DataFlashSendCommand (pDataFlash, DB_PAGE_PGM_BUF1,
	cmdsize, dest)); }


	/---------------------------------------------------------------------------/
	/* Function Name : AT91F_MainMemoryToBufferTransfert */
	/* Object : Read a page in the SRAM Buffer 1 or 2 */
	/* Input Parameters : DataFlash Service */
	/* : Page concerned */
	/* : */
	/* Return value : State of the dataflash */
	/---------------------------------------------------------------------------/
	AT91S_DataFlashStatus AT91F_MainMemoryToBufferTransfert(
	AT91PS_DataFlash pDataFlash,
	unsigned char BufferCommand,
	unsigned int page)
	{
	int cmdsize;
	/* Test if the buffer command is legal */
	if ((BufferCommand != DB_PAGE_2_BUF1_TRF)
	&& (BufferCommand != DB_PAGE_2_BUF2_TRF))
	return DATAFLASH_BAD_COMMAND;

	/* no data to transmit or receive */
	pDataFlash->pDataFlashDesc->tx_data_size = 0;
	cmdsize = 4;
	if (pDataFlash->pDevice->pages_number >= 16384)
	cmdsize = 5;
	return(AT91F_DataFlashSendCommand (pDataFlash, BufferCommand, cmdsize,
	page*pDataFlash->pDevice->pages_size));
	}


	/-------------------------------------------------------------------------- /
	/* Function Name : AT91F_DataFlashWriteBuffer */
	/* Object : Write data to the internal sram buffer 1 or 2 */
	/* Input Parameters : DataFlash Service */
	/* : <BufferCommand> = command to write buffer1 or 2 */
	/* : <dataBuffer> = data buffer to write /
	/* : <bufferAddress> = address in the internal buffer */
	/* : <SizeToWrite> = data buffer size */
	/* Return value : State of the dataflash */
	/---------------------------------------------------------------------------/
	AT91S_DataFlashStatus AT91F_DataFlashWriteBuffer (
	AT91PS_DataFlash pDataFlash,
	unsigned char BufferCommand,
	unsigned char *dataBuffer,
	unsigned int bufferAddress,
	int SizeToWrite )
	{
	int cmdsize;
	/* Test if the buffer command is legal */
	if ((BufferCommand != DB_BUF1_WRITE)
	&& (BufferCommand != DB_BUF2_WRITE))
	return DATAFLASH_BAD_COMMAND;

	/* buffer address must be lower than page size */
	if (bufferAddress > pDataFlash->pDevice->pages_size)
	return DATAFLASH_BAD_ADDRESS;

	if ( (pDataFlash->pDataFlashDesc->state) != IDLE)
	return DATAFLASH_BUSY;

	/* Send first Write Command */
	pDataFlash->pDataFlashDesc->command[0] = BufferCommand;
	pDataFlash->pDataFlashDesc->command[1] = 0;
	if (pDataFlash->pDevice->pages_number >= 16384) {
	pDataFlash->pDataFlashDesc->command[2] = 0;
	pDataFlash->pDataFlashDesc->command[3] =
	(unsigned char)(((unsigned int)(bufferAddress &
	pDataFlash->pDevice->byte_mask)) >> 8);
	pDataFlash->pDataFlashDesc->command[4] =
	(unsigned char)((unsigned int)bufferAddress & 0x00FF);
	cmdsize = 5;
	} else {
	pDataFlash->pDataFlashDesc->command[2] =
	(unsigned char)(((unsigned int)(bufferAddress &
	pDataFlash->pDevice->byte_mask)) >> 8);
	pDataFlash->pDataFlashDesc->command[3] =
	(unsigned char)((unsigned int)bufferAddress & 0x00FF);
	pDataFlash->pDataFlashDesc->command[4] = 0;
	cmdsize = 4;
	}

	pDataFlash->pDataFlashDesc->tx_cmd_pt =
	pDataFlash->pDataFlashDesc->command;
	pDataFlash->pDataFlashDesc->tx_cmd_size = cmdsize;
	pDataFlash->pDataFlashDesc->rx_cmd_pt =
	pDataFlash->pDataFlashDesc->command;
	pDataFlash->pDataFlashDesc->rx_cmd_size = cmdsize;

	pDataFlash->pDataFlashDesc->rx_data_pt = dataBuffer;
	pDataFlash->pDataFlashDesc->tx_data_pt = dataBuffer;
	pDataFlash->pDataFlashDesc->rx_data_size = SizeToWrite;
	pDataFlash->pDataFlashDesc->tx_data_size = SizeToWrite;

	return AT91F_SpiWrite(pDataFlash->pDataFlashDesc);
	}

	/---------------------------------------------------------------------------/
	/* Function Name : AT91F_PageErase */
	/* Object : Erase a page */
	/* Input Parameters : DataFlash Service */
	/* : Page concerned */
	/* : */
	/* Return value : State of the dataflash */
	/---------------------------------------------------------------------------/
	AT91S_DataFlashStatus AT91F_PageErase(
	AT91PS_DataFlash pDataFlash,
	unsigned int page)
	{
	int cmdsize;
	/* Test if the buffer command is legal */
	/* no data to transmit or receive */
	pDataFlash->pDataFlashDesc->tx_data_size = 0;

	cmdsize = 4;
	if (pDataFlash->pDevice->pages_number >= 16384)
	cmdsize = 5;
	return(AT91F_DataFlashSendCommand (pDataFlash, DB_PAGE_ERASE, cmdsize,
	page*pDataFlash->pDevice->pages_size));
	}


	/---------------------------------------------------------------------------/
	/* Function Name : AT91F_BlockErase */
	/* Object : Erase a Block */
	/* Input Parameters : DataFlash Service */
	/* : Page concerned */
	/* : */
	/* Return value : State of the dataflash */
	/---------------------------------------------------------------------------/
	AT91S_DataFlashStatus AT91F_BlockErase(
	AT91PS_DataFlash pDataFlash,
	unsigned int block)
	{
	int cmdsize;
	/* Test if the buffer command is legal */
	/* no data to transmit or receive */
	pDataFlash->pDataFlashDesc->tx_data_size = 0;
	cmdsize = 4;
	if (pDataFlash->pDevice->pages_number >= 16384)
	cmdsize = 5;
	return(AT91F_DataFlashSendCommand (pDataFlash, DB_BLOCK_ERASE,cmdsize,
	block8pDataFlash->pDevice->pages_size));
	}

	/---------------------------------------------------------------------------/
	/* Function Name : AT91F_WriteBufferToMain */
	/* Object : Write buffer to the main memory */
	/* Input Parameters : DataFlash Service */
	/* : <BufferCommand> = command to send to buffer1 or buffer2 */
	/* : <dest> = main memory address */
	/* Return value : State of the dataflash */
	/---------------------------------------------------------------------------/
	AT91S_DataFlashStatus AT91F_WriteBufferToMain (
	AT91PS_DataFlash pDataFlash,
	unsigned char BufferCommand,
	unsigned int dest )
	{
	int cmdsize;
	/* Test if the buffer command is correct */
	if ((BufferCommand != DB_BUF1_PAGE_PGM) &&
	(BufferCommand != DB_BUF1_PAGE_ERASE_PGM) &&
	(BufferCommand != DB_BUF2_PAGE_PGM) &&
	(BufferCommand != DB_BUF2_PAGE_ERASE_PGM) )
	return DATAFLASH_BAD_COMMAND;

	/* no data to transmit or receive */
	pDataFlash->pDataFlashDesc->tx_data_size = 0;

	cmdsize = 4;
	if (pDataFlash->pDevice->pages_number >= 16384)
	cmdsize = 5;
	/* Send the command to the dataflash */
	return(AT91F_DataFlashSendCommand (pDataFlash, BufferCommand, cmdsize,
	dest)); }


	/---------------------------------------------------------------------------/
	/* Function Name : AT91F_PartialPageWrite */
	/* Object : Erase partielly a page */
	/* Input Parameters : <page> = page number */
	/* : <AdrInpage> = adr to begin the fading */
	/* : <length> = Number of bytes to erase */
	/---------------------------------------------------------------------------/
	AT91S_DataFlashStatus AT91F_PartialPageWrite (
	AT91PS_DataFlash pDataFlash,
	unsigned char *src,
	unsigned int dest,
	unsigned int size)
	{
	unsigned int page;
	unsigned int AdrInPage;

	page = dest / (pDataFlash->pDevice->pages_size);
	AdrInPage = dest % (pDataFlash->pDevice->pages_size);

	/* Read the contents of the page in the Sram Buffer */
	AT91F_MainMemoryToBufferTransfert(pDataFlash,
	DB_PAGE_2_BUF1_TRF, page);
	AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
	AT91C_TIMEOUT_WRDY);
	/Update the SRAM buffer /
	AT91F_DataFlashWriteBuffer(pDataFlash, DB_BUF1_WRITE, src,
	AdrInPage, size);

	AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
	AT91C_TIMEOUT_WRDY);

	/* Erase page if a 128 Mbits device */
	if (pDataFlash->pDevice->pages_number >= 16384) {
	AT91F_PageErase(pDataFlash, page);
	/* Rewrite the modified Sram Buffer in the main memory */
	AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
	AT91C_TIMEOUT_WRDY);
	}

	/* Rewrite the modified Sram Buffer in the main memory */
	return(AT91F_WriteBufferToMain(pDataFlash, DB_BUF1_PAGE_ERASE_PGM,
	(page*pDataFlash->pDevice->pages_size)));
	}

	/---------------------------------------------------------------------------/
	/* Function Name : AT91F_DataFlashWrite */
	/* Object : */
	/* Input Parameters : <src> = Source buffer /
	/* : <dest> = dataflash adress */
	/* : <size> = data buffer size */
	/---------------------------------------------------------------------------/
	AT91S_DataFlashStatus AT91F_DataFlashWrite(
	AT91PS_DataFlash pDataFlash,
	unsigned char *src,
	int dest,
	int size )
	{
	unsigned int length;
	unsigned int page;
	unsigned int status;

	AT91F_SpiEnable(pDataFlash->pDevice->cs);

	if ( (dest + size) > (pDataFlash->pDevice->pages_size *
	(pDataFlash->pDevice->pages_number)))
	return DATAFLASH_MEMORY_OVERFLOW;

	/* If destination does not fit a page start address */
	if ((dest % ((unsigned int)(pDataFlash->pDevice->pages_size))) != 0 )
	{
	length = pDataFlash->pDevice->pages_size -
	(dest %
	((unsigned int)
	(pDataFlash->pDevice->pages_size)));

	if (size < length)
	length = size;

	if(!AT91F_PartialPageWrite(pDataFlash,src, dest, length))
	return DATAFLASH_ERROR;

	AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
	AT91C_TIMEOUT_WRDY);

	/* Update size, source and destination pointers */
	size -= length;
	dest += length;
	src += length;
	}

	while (( size - pDataFlash->pDevice->pages_size ) >= 0 ) {
	/* program dataflash page */
	page = (unsigned int)dest / (pDataFlash->pDevice->pages_size);

	status = AT91F_DataFlashWriteBuffer(pDataFlash,
	DB_BUF1_WRITE, src, 0,
	pDataFlash->pDevice->pages_size);
	AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
	AT91C_TIMEOUT_WRDY);

	status = AT91F_PageErase(pDataFlash, page);
	AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
	AT91C_TIMEOUT_WRDY);
	if (!status)
	return DATAFLASH_ERROR;

	status = AT91F_WriteBufferToMain (pDataFlash,
	DB_BUF1_PAGE_PGM, dest);
	if(!status)
	return DATAFLASH_ERROR;

	AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
	AT91C_TIMEOUT_WRDY);

	/* Update size, source and destination pointers */
	size -= pDataFlash->pDevice->pages_size;
	dest += pDataFlash->pDevice->pages_size;
	src += pDataFlash->pDevice->pages_size;
	}

	/* If still some bytes to read */
	if ( size > 0 ) {
	/* program dataflash page */
	if(!AT91F_PartialPageWrite(pDataFlash, src, dest, size) )
	return DATAFLASH_ERROR;

	AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
	AT91C_TIMEOUT_WRDY);
	}
	return DATAFLASH_OK;
	}


	/---------------------------------------------------------------------------/
	/* Function Name : AT91F_DataFlashRead */
	/* Object : Read a block in dataflash */
	/* Input Parameters : */
	/* Return value : */
	/---------------------------------------------------------------------------/
	int AT91F_DataFlashRead(
	AT91PS_DataFlash pDataFlash,
	unsigned long addr,
	unsigned long size,
	char *buffer)
	{
	unsigned long SizeToRead;

	AT91F_SpiEnable(pDataFlash->pDevice->cs);

	if(AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
	AT91C_TIMEOUT_WRDY) != DATAFLASH_OK)
	return -1;

	while (size) {
	SizeToRead = (size < 0x8000)? size:0x8000;

	if (AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
	AT91C_TIMEOUT_WRDY) != DATAFLASH_OK)
	return -1;

	if (AT91F_DataFlashContinuousRead (pDataFlash, addr,
	(uchar *) buffer, SizeToRead) != DATAFLASH_OK)
	return -1;

	size -= SizeToRead;
	addr += SizeToRead;
	buffer += SizeToRead;
	}

	return DATAFLASH_OK;
	}

	/---------------------------------------------------------------------------/
	/* Function Name : AT91F_DataflashProbe */
	/* Object : */
	/* Input Parameters : */
	/* Return value : Dataflash status register */
	/---------------------------------------------------------------------------/
	int AT91F_DataflashProbe(int cs, AT91PS_DataflashDesc pDesc) {
	AT91F_SpiEnable(cs);
	AT91F_DataFlashGetStatus(pDesc);
	return((pDesc->command[1] == 0xFF)? 0: pDesc->command[1] & 0x3C);
	}
	#endif