drivers/dataflash.c - github/trini/u-boot - Gitiles

 /* LowLevel function 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 <common.h>
 #include <config.h>
 #ifdef CONFIG_HAS_DATAFLASH
 #include <asm/hardware.h>
 #include <dataflash.h>

 AT91S_DATAFLASH_INFO dataflash_info[CFG_MAX_DATAFLASH_BANKS];
 static AT91S_DataFlash DataFlashInst;

 int cs[][CFG_MAX_DATAFLASH_BANKS] = {
 	{CFG_DATAFLASH_LOGIC_ADDR_CS0, 0},	/* Logical adress, CS */
 	{CFG_DATAFLASH_LOGIC_ADDR_CS3, 3}
 };

 /*define the area offsets*/
 dataflash_protect_t area_list[NB_DATAFLASH_AREA] = {
 	{0, 0x7fff, FLAG_PROTECT_SET},			/* ROM code */
 	{0x8000, 0x1ffff, FLAG_PROTECT_SET},		/* u-boot code */
 	{0x20000, 0x27fff, FLAG_PROTECT_CLEAR},		/* u-boot environment */
 	{0x28000, 0x1fffff, FLAG_PROTECT_CLEAR},	/* data area size to tune */
 };

 extern void AT91F_SpiInit (void);
 extern int AT91F_DataflashProbe (int i, AT91PS_DataflashDesc pDesc);
 extern int AT91F_DataFlashRead (AT91PS_DataFlash pDataFlash,
 				unsigned long addr,
 				unsigned long size, char *buffer);
 extern int AT91F_DataFlashWrite( AT91PS_DataFlash pDataFlash,
 				    unsigned char *src,
 			            int dest,
 				    int size );

 int AT91F_DataflashInit (void)
 {
 	int i, j;
 	int dfcode;

 	AT91F_SpiInit ();

 	for (i = 0; i < CFG_MAX_DATAFLASH_BANKS; i++) {
 		dataflash_info[i].Desc.state = IDLE;
 		dataflash_info[i].id = 0;
 		dataflash_info[i].Device.pages_number = 0;
 		dfcode = AT91F_DataflashProbe (cs[i][1], &dataflash_info[i].Desc);

 		switch (dfcode) {
 		case AT45DB161:
 			dataflash_info[i].Device.pages_number = 4096;
 			dataflash_info[i].Device.pages_size = 528;
 			dataflash_info[i].Device.page_offset = 10;
 			dataflash_info[i].Device.byte_mask = 0x300;
 			dataflash_info[i].Device.cs = cs[i][1];
 			dataflash_info[i].Desc.DataFlash_state = IDLE;
 			dataflash_info[i].logical_address = cs[i][0];
 			dataflash_info[i].id = dfcode;
 			break;

 		case AT45DB321:
 			dataflash_info[i].Device.pages_number = 8192;
 			dataflash_info[i].Device.pages_size = 528;
 			dataflash_info[i].Device.page_offset = 10;
 			dataflash_info[i].Device.byte_mask = 0x300;
 			dataflash_info[i].Device.cs = cs[i][1];
 			dataflash_info[i].Desc.DataFlash_state = IDLE;
 			dataflash_info[i].logical_address = cs[i][0];
 			dataflash_info[i].id = dfcode;
 			break;

 		case AT45DB642:
 			dataflash_info[i].Device.pages_number = 8192;
 			dataflash_info[i].Device.pages_size = 1056;
 			dataflash_info[i].Device.page_offset = 11;
 			dataflash_info[i].Device.byte_mask = 0x700;
 			dataflash_info[i].Device.cs = cs[i][1];
 			dataflash_info[i].Desc.DataFlash_state = IDLE;
 			dataflash_info[i].logical_address = cs[i][0];
 			dataflash_info[i].id = dfcode;
 			break;
 		case AT45DB128:
 			dataflash_info[i].Device.pages_number = 16384;
 			dataflash_info[i].Device.pages_size = 1056;
 			dataflash_info[i].Device.page_offset = 11;
 			dataflash_info[i].Device.byte_mask = 0x700;
 			dataflash_info[i].Device.cs = cs[i][1];
 			dataflash_info[i].Desc.DataFlash_state = IDLE;
 			dataflash_info[i].logical_address = cs[i][0];
 			dataflash_info[i].id = dfcode;
 			break;

 		default:
 			break;
 		}
 		/* set the last area end to the dataflash size*/
 		area_list[NB_DATAFLASH_AREA -1].end =
 				(dataflash_info[i].Device.pages_number *
 				dataflash_info[i].Device.pages_size)-1;

 		/* set the area addresses */
 		for(j = 0; j<NB_DATAFLASH_AREA; j++) {
 			dataflash_info[i].Device.area_list[j].start = area_list[j].start + dataflash_info[i].logical_address;
 			dataflash_info[i].Device.area_list[j].end = area_list[j].end + dataflash_info[i].logical_address;
 			dataflash_info[i].Device.area_list[j].protected = area_list[j].protected;
 		}
 	}
 	return (1);
 }


 void dataflash_print_info (void)
 {
 	int i, j;

 	for (i = 0; i < CFG_MAX_DATAFLASH_BANKS; i++) {
 		if (dataflash_info[i].id != 0) {
 			printf ("DataFlash:");
 			switch (dataflash_info[i].id) {
 			case AT45DB161:
 				printf ("AT45DB161\n");
 				break;

 			case AT45DB321:
 				printf ("AT45DB321\n");
 				break;

 			case AT45DB642:
 				printf ("AT45DB642\n");
 				break;
 			case AT45DB128:
 				printf ("AT45DB128\n");
 				break;
 			}

 			printf ("Nb pages: %6d\n"
 				"Page Size: %6d\n"
 				"Size=%8d bytes\n"
 				"Logical address: 0x%08X\n",
 				(unsigned int) dataflash_info[i].Device.pages_number,
 				(unsigned int) dataflash_info[i].Device.pages_size,
 				(unsigned int) dataflash_info[i].Device.pages_number *
 				dataflash_info[i].Device.pages_size,
 				(unsigned int) dataflash_info[i].logical_address);
 			for (j=0; j< NB_DATAFLASH_AREA; j++) {
 				printf ("Area %i:\t%08X to %08X %s\n", j,
 					dataflash_info[i].Device.area_list[j].start,
 					dataflash_info[i].Device.area_list[j].end,
 					(dataflash_info[i].Device.area_list[j].protected ==
 					FLAG_PROTECT_SET) ? "(RO)" : "");
 			}
 		}
 	}
 }


 /*------------------------------------------------------------------------------*/
 /* Function Name       : AT91F_DataflashSelect 					*/
 /* Object              : Select the correct device				*/
 /*------------------------------------------------------------------------------*/
 AT91PS_DataFlash AT91F_DataflashSelect (AT91PS_DataFlash pFlash,
 										unsigned int *addr)
 {
 	char addr_valid = 0;
 	int i;

 	for (i = 0; i < CFG_MAX_DATAFLASH_BANKS; i++)
 		if ((*addr & 0xFF000000) == dataflash_info[i].logical_address) {
 			addr_valid = 1;
 			break;
 		}
 	if (!addr_valid) {
 		pFlash = (AT91PS_DataFlash) 0;
 		return pFlash;
 	}
 	pFlash->pDataFlashDesc = &(dataflash_info[i].Desc);
 	pFlash->pDevice = &(dataflash_info[i].Device);
 	*addr -= dataflash_info[i].logical_address;
 	return (pFlash);
 }

 /*------------------------------------------------------------------------------*/
 /* Function Name       : addr_dataflash 					*/
 /* Object              : Test if address is valid				*/
 /*------------------------------------------------------------------------------*/
 int addr_dataflash (unsigned long addr)
 {
 	int addr_valid = 0;
 	int i;

 	for (i = 0; i < CFG_MAX_DATAFLASH_BANKS; i++) {
 		if ((((int) addr) & 0xFF000000) ==
 			dataflash_info[i].logical_address) {
 			addr_valid = 1;
 			break;
 		}
 	}

 	return addr_valid;
 }
 /*-----------------------------------------------------------------------------*/
 /* Function Name       : size_dataflash 					*/
 /* Object              : Test if address is valid regarding the size		*/
 /*-----------------------------------------------------------------------------*/
 int size_dataflash (AT91PS_DataFlash pdataFlash, unsigned long addr, unsigned long size)
 {
 	/* is outside the dataflash */
 	if (((int)addr & 0x0FFFFFFF) > (pdataFlash->pDevice->pages_size *
 		pdataFlash->pDevice->pages_number)) return 0;
 	/* is too large for the dataflash */
 	if (size > ((pdataFlash->pDevice->pages_size *
 		pdataFlash->pDevice->pages_number) - ((int)addr & 0x0FFFFFFF))) return 0;

 	return 1;
 }
 /*-----------------------------------------------------------------------------*/
 /* Function Name       : prot_dataflash 					*/
 /* Object              : Test if destination area is protected			*/
 /*-----------------------------------------------------------------------------*/
 int prot_dataflash (AT91PS_DataFlash pdataFlash, unsigned long addr)
 {
 int area;
 	/* find area */
 	for (area=0; area < NB_DATAFLASH_AREA; area++) {
 		if ((addr >= pdataFlash->pDevice->area_list[area].start) &&
 			(addr < pdataFlash->pDevice->area_list[area].end))
 			break;
 	}
 	if (area == NB_DATAFLASH_AREA) return -1;
 	/*test protection value*/
 	if (pdataFlash->pDevice->area_list[area].protected == FLAG_PROTECT_SET) return 0;

 	return 1;
 }
 /*-----------------------------------------------------------------------------*/
 /* Function Name       : dataflash_real_protect				*/
 /* Object              : protect/unprotect area				*/
 /*-----------------------------------------------------------------------------*/
 int dataflash_real_protect (int flag, unsigned long start_addr, unsigned long end_addr)
 {
 int i,j, area1, area2, addr_valid = 0;
 	/* find dataflash */
 	for (i = 0; i < CFG_MAX_DATAFLASH_BANKS; i++) {
 		if ((((int) start_addr) & 0xF0000000) ==
 			dataflash_info[i].logical_address) {
 				addr_valid = 1;
 				break;
 		}
 	}
 	if (!addr_valid) {
 		return -1;
 	}
 	/* find start area */
 	for (area1=0; area1 < NB_DATAFLASH_AREA; area1++) {
 		if (start_addr == dataflash_info[i].Device.area_list[area1].start) break;
 	}
 	if (area1 == NB_DATAFLASH_AREA) return -1;
 	/* find end area */
 	for (area2=0; area2 < NB_DATAFLASH_AREA; area2++) {
 		if (end_addr == dataflash_info[i].Device.area_list[area2].end) break;
 	}
 	if (area2 == NB_DATAFLASH_AREA) return -1;

 	/*set protection value*/
 	for(j = area1; j < area2+1 ; j++)
 		if (flag == 0) dataflash_info[i].Device.area_list[j].protected = FLAG_PROTECT_CLEAR;
 		else dataflash_info[i].Device.area_list[j].protected = FLAG_PROTECT_SET;

 	return (area2-area1+1);
 }

 /*------------------------------------------------------------------------------*/
 /* Function Name       : read_dataflash 					*/
 /* Object              : dataflash memory read					*/
 /*------------------------------------------------------------------------------*/
 int read_dataflash (unsigned long addr, unsigned long size, char *result)
 {
 	int AddrToRead = addr;
 	AT91PS_DataFlash pFlash = &DataFlashInst;

 	pFlash = AT91F_DataflashSelect (pFlash, &AddrToRead);

 	if (pFlash == 0)
 		return ERR_UNKNOWN_FLASH_TYPE;

 	if (size_dataflash(pFlash,addr,size) == 0)
 		return ERR_INVAL;

 	return (AT91F_DataFlashRead (pFlash, AddrToRead, size, result));
 }


 /*-----------------------------------------------------------------------------*/
 /* Function Name       : write_dataflash 				       */
 /* Object              : write a block in dataflash			       */
 /*-----------------------------------------------------------------------------*/
 int write_dataflash (unsigned long addr_dest, unsigned long addr_src,
 		     unsigned long size)
 {
 	int AddrToWrite = addr_dest;
 	AT91PS_DataFlash pFlash = &DataFlashInst;

 	pFlash = AT91F_DataflashSelect (pFlash, &AddrToWrite);

 	if (pFlash == 0)
 		return ERR_UNKNOWN_FLASH_TYPE;

 	if (size_dataflash(pFlash,addr_dest,size) == 0)
 		return ERR_INVAL;

 	if (prot_dataflash(pFlash,addr_dest) == 0)
 		return ERR_PROTECTED;

 	if (AddrToWrite == -1)
 		return -1;

 	return AT91F_DataFlashWrite (pFlash, (char *) addr_src, AddrToWrite, size);
 }


 void dataflash_perror (int err)
 {
 	switch (err) {
 	case ERR_OK:
 		break;
 	case ERR_TIMOUT:
 		printf ("Timeout writing to DataFlash\n");
 		break;
 	case ERR_PROTECTED:
 		printf ("Can't write to protected DataFlash sectors\n");
 		break;
 	case ERR_INVAL:
 		printf ("Outside available DataFlash\n");
 		break;
 	case ERR_UNKNOWN_FLASH_TYPE:
 		printf ("Unknown Type of DataFlash\n");
 		break;
 	case ERR_PROG_ERROR:
 		printf ("General DataFlash Programming Error\n");
 		break;
 	default:
 		printf ("%s[%d] FIXME: rc=%d\n", __FILE__, __LINE__, err);
 		break;
 	}
 }

 #endif
	/* LowLevel function 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 <common.h>
	#include <config.h>
	#ifdef CONFIG_HAS_DATAFLASH
	#include <asm/hardware.h>
	#include <dataflash.h>

	AT91S_DATAFLASH_INFO dataflash_info[CFG_MAX_DATAFLASH_BANKS];
	static AT91S_DataFlash DataFlashInst;

	int cs[][CFG_MAX_DATAFLASH_BANKS] = {
	{CFG_DATAFLASH_LOGIC_ADDR_CS0, 0}, /* Logical adress, CS */
	{CFG_DATAFLASH_LOGIC_ADDR_CS3, 3}
	};

	/define the area offsets/
	dataflash_protect_t area_list[NB_DATAFLASH_AREA] = {
	{0, 0x7fff, FLAG_PROTECT_SET}, /* ROM code */
	{0x8000, 0x1ffff, FLAG_PROTECT_SET}, /* u-boot code */
	{0x20000, 0x27fff, FLAG_PROTECT_CLEAR}, /* u-boot environment */
	{0x28000, 0x1fffff, FLAG_PROTECT_CLEAR}, /* data area size to tune */
	};

	extern void AT91F_SpiInit (void);
	extern int AT91F_DataflashProbe (int i, AT91PS_DataflashDesc pDesc);
	extern int AT91F_DataFlashRead (AT91PS_DataFlash pDataFlash,
	unsigned long addr,
	unsigned long size, char *buffer);
	extern int AT91F_DataFlashWrite( AT91PS_DataFlash pDataFlash,
	unsigned char *src,
	int dest,
	int size );

	int AT91F_DataflashInit (void)
	{
	int i, j;
	int dfcode;

	AT91F_SpiInit ();

	for (i = 0; i < CFG_MAX_DATAFLASH_BANKS; i++) {
	dataflash_info[i].Desc.state = IDLE;
	dataflash_info[i].id = 0;
	dataflash_info[i].Device.pages_number = 0;
	dfcode = AT91F_DataflashProbe (cs[i][1], &dataflash_info[i].Desc);

	switch (dfcode) {
	case AT45DB161:
	dataflash_info[i].Device.pages_number = 4096;
	dataflash_info[i].Device.pages_size = 528;
	dataflash_info[i].Device.page_offset = 10;
	dataflash_info[i].Device.byte_mask = 0x300;
	dataflash_info[i].Device.cs = cs[i][1];
	dataflash_info[i].Desc.DataFlash_state = IDLE;
	dataflash_info[i].logical_address = cs[i][0];
	dataflash_info[i].id = dfcode;
	break;

	case AT45DB321:
	dataflash_info[i].Device.pages_number = 8192;
	dataflash_info[i].Device.pages_size = 528;
	dataflash_info[i].Device.page_offset = 10;
	dataflash_info[i].Device.byte_mask = 0x300;
	dataflash_info[i].Device.cs = cs[i][1];
	dataflash_info[i].Desc.DataFlash_state = IDLE;
	dataflash_info[i].logical_address = cs[i][0];
	dataflash_info[i].id = dfcode;
	break;

	case AT45DB642:
	dataflash_info[i].Device.pages_number = 8192;
	dataflash_info[i].Device.pages_size = 1056;
	dataflash_info[i].Device.page_offset = 11;
	dataflash_info[i].Device.byte_mask = 0x700;
	dataflash_info[i].Device.cs = cs[i][1];
	dataflash_info[i].Desc.DataFlash_state = IDLE;
	dataflash_info[i].logical_address = cs[i][0];
	dataflash_info[i].id = dfcode;
	break;
	case AT45DB128:
	dataflash_info[i].Device.pages_number = 16384;
	dataflash_info[i].Device.pages_size = 1056;
	dataflash_info[i].Device.page_offset = 11;
	dataflash_info[i].Device.byte_mask = 0x700;
	dataflash_info[i].Device.cs = cs[i][1];
	dataflash_info[i].Desc.DataFlash_state = IDLE;
	dataflash_info[i].logical_address = cs[i][0];
	dataflash_info[i].id = dfcode;
	break;

	default:
	break;
	}
	/* set the last area end to the dataflash size*/
	area_list[NB_DATAFLASH_AREA -1].end =
	(dataflash_info[i].Device.pages_number *
	dataflash_info[i].Device.pages_size)-1;

	/* set the area addresses */
	for(j = 0; j<NB_DATAFLASH_AREA; j++) {
	dataflash_info[i].Device.area_list[j].start = area_list[j].start + dataflash_info[i].logical_address;
	dataflash_info[i].Device.area_list[j].end = area_list[j].end + dataflash_info[i].logical_address;
	dataflash_info[i].Device.area_list[j].protected = area_list[j].protected;
	}
	}
	return (1);
	}


	void dataflash_print_info (void)
	{
	int i, j;

	for (i = 0; i < CFG_MAX_DATAFLASH_BANKS; i++) {
	if (dataflash_info[i].id != 0) {
	printf ("DataFlash:");
	switch (dataflash_info[i].id) {
	case AT45DB161:
	printf ("AT45DB161\n");
	break;

	case AT45DB321:
	printf ("AT45DB321\n");
	break;

	case AT45DB642:
	printf ("AT45DB642\n");
	break;
	case AT45DB128:
	printf ("AT45DB128\n");
	break;
	}

	printf ("Nb pages: %6d\n"
	"Page Size: %6d\n"
	"Size=%8d bytes\n"
	"Logical address: 0x%08X\n",
	(unsigned int) dataflash_info[i].Device.pages_number,
	(unsigned int) dataflash_info[i].Device.pages_size,
	(unsigned int) dataflash_info[i].Device.pages_number *
	dataflash_info[i].Device.pages_size,
	(unsigned int) dataflash_info[i].logical_address);
	for (j=0; j< NB_DATAFLASH_AREA; j++) {
	printf ("Area %i:\t%08X to %08X %s\n", j,
	dataflash_info[i].Device.area_list[j].start,
	dataflash_info[i].Device.area_list[j].end,
	(dataflash_info[i].Device.area_list[j].protected ==
	FLAG_PROTECT_SET) ? "(RO)" : "");
	}
	}
	}
	}


	/------------------------------------------------------------------------------/
	/* Function Name : AT91F_DataflashSelect */
	/* Object : Select the correct device */
	/------------------------------------------------------------------------------/
	AT91PS_DataFlash AT91F_DataflashSelect (AT91PS_DataFlash pFlash,
	unsigned int *addr)
	{
	char addr_valid = 0;
	int i;

	for (i = 0; i < CFG_MAX_DATAFLASH_BANKS; i++)
	if ((*addr & 0xFF000000) == dataflash_info[i].logical_address) {
	addr_valid = 1;
	break;
	}
	if (!addr_valid) {
	pFlash = (AT91PS_DataFlash) 0;
	return pFlash;
	}
	pFlash->pDataFlashDesc = &(dataflash_info[i].Desc);
	pFlash->pDevice = &(dataflash_info[i].Device);
	*addr -= dataflash_info[i].logical_address;
	return (pFlash);
	}

	/------------------------------------------------------------------------------/
	/* Function Name : addr_dataflash */
	/* Object : Test if address is valid */
	/------------------------------------------------------------------------------/
	int addr_dataflash (unsigned long addr)
	{
	int addr_valid = 0;
	int i;

	for (i = 0; i < CFG_MAX_DATAFLASH_BANKS; i++) {
	if ((((int) addr) & 0xFF000000) ==
	dataflash_info[i].logical_address) {
	addr_valid = 1;
	break;
	}
	}

	return addr_valid;
	}
	/-----------------------------------------------------------------------------/
	/* Function Name : size_dataflash */
	/* Object : Test if address is valid regarding the size */
	/-----------------------------------------------------------------------------/
	int size_dataflash (AT91PS_DataFlash pdataFlash, unsigned long addr, unsigned long size)
	{
	/* is outside the dataflash */
	if (((int)addr & 0x0FFFFFFF) > (pdataFlash->pDevice->pages_size *
	pdataFlash->pDevice->pages_number)) return 0;
	/* is too large for the dataflash */
	if (size > ((pdataFlash->pDevice->pages_size *
	pdataFlash->pDevice->pages_number) - ((int)addr & 0x0FFFFFFF))) return 0;

	return 1;
	}
	/-----------------------------------------------------------------------------/
	/* Function Name : prot_dataflash */
	/* Object : Test if destination area is protected */
	/-----------------------------------------------------------------------------/
	int prot_dataflash (AT91PS_DataFlash pdataFlash, unsigned long addr)
	{
	int area;
	/* find area */
	for (area=0; area < NB_DATAFLASH_AREA; area++) {
	if ((addr >= pdataFlash->pDevice->area_list[area].start) &&
	(addr < pdataFlash->pDevice->area_list[area].end))
	break;
	}
	if (area == NB_DATAFLASH_AREA) return -1;
	/test protection value/
	if (pdataFlash->pDevice->area_list[area].protected == FLAG_PROTECT_SET) return 0;

	return 1;
	}
	/-----------------------------------------------------------------------------/
	/* Function Name : dataflash_real_protect */
	/* Object : protect/unprotect area */
	/-----------------------------------------------------------------------------/
	int dataflash_real_protect (int flag, unsigned long start_addr, unsigned long end_addr)
	{
	int i,j, area1, area2, addr_valid = 0;
	/* find dataflash */
	for (i = 0; i < CFG_MAX_DATAFLASH_BANKS; i++) {
	if ((((int) start_addr) & 0xF0000000) ==
	dataflash_info[i].logical_address) {
	addr_valid = 1;
	break;
	}
	}
	if (!addr_valid) {
	return -1;
	}
	/* find start area */
	for (area1=0; area1 < NB_DATAFLASH_AREA; area1++) {
	if (start_addr == dataflash_info[i].Device.area_list[area1].start) break;
	}
	if (area1 == NB_DATAFLASH_AREA) return -1;
	/* find end area */
	for (area2=0; area2 < NB_DATAFLASH_AREA; area2++) {
	if (end_addr == dataflash_info[i].Device.area_list[area2].end) break;
	}
	if (area2 == NB_DATAFLASH_AREA) return -1;

	/set protection value/
	for(j = area1; j < area2+1 ; j++)
	if (flag == 0) dataflash_info[i].Device.area_list[j].protected = FLAG_PROTECT_CLEAR;
	else dataflash_info[i].Device.area_list[j].protected = FLAG_PROTECT_SET;

	return (area2-area1+1);
	}

	/------------------------------------------------------------------------------/
	/* Function Name : read_dataflash */
	/* Object : dataflash memory read */
	/------------------------------------------------------------------------------/
	int read_dataflash (unsigned long addr, unsigned long size, char *result)
	{
	int AddrToRead = addr;
	AT91PS_DataFlash pFlash = &DataFlashInst;

	pFlash = AT91F_DataflashSelect (pFlash, &AddrToRead);

	if (pFlash == 0)
	return ERR_UNKNOWN_FLASH_TYPE;

	if (size_dataflash(pFlash,addr,size) == 0)
	return ERR_INVAL;

	return (AT91F_DataFlashRead (pFlash, AddrToRead, size, result));
	}


	/-----------------------------------------------------------------------------/
	/* Function Name : write_dataflash */
	/* Object : write a block in dataflash */
	/-----------------------------------------------------------------------------/
	int write_dataflash (unsigned long addr_dest, unsigned long addr_src,
	unsigned long size)
	{
	int AddrToWrite = addr_dest;
	AT91PS_DataFlash pFlash = &DataFlashInst;

	pFlash = AT91F_DataflashSelect (pFlash, &AddrToWrite);

	if (pFlash == 0)
	return ERR_UNKNOWN_FLASH_TYPE;

	if (size_dataflash(pFlash,addr_dest,size) == 0)
	return ERR_INVAL;

	if (prot_dataflash(pFlash,addr_dest) == 0)
	return ERR_PROTECTED;

	if (AddrToWrite == -1)
	return -1;

	return AT91F_DataFlashWrite (pFlash, (char *) addr_src, AddrToWrite, size);
	}


	void dataflash_perror (int err)
	{
	switch (err) {
	case ERR_OK:
	break;
	case ERR_TIMOUT:
	printf ("Timeout writing to DataFlash\n");
	break;
	case ERR_PROTECTED:
	printf ("Can't write to protected DataFlash sectors\n");
	break;
	case ERR_INVAL:
	printf ("Outside available DataFlash\n");
	break;
	case ERR_UNKNOWN_FLASH_TYPE:
	printf ("Unknown Type of DataFlash\n");
	break;
	case ERR_PROG_ERROR:
	printf ("General DataFlash Programming Error\n");
	break;
	default:
	printf ("%s[%d] FIXME: rc=%d\n", __FILE__, __LINE__, err);
	break;
	}
	}

	#endif