flashrom.c

S3C2410学习的基础资料 大部分实验源码及工程

#include "flashrom.h"
#include "def.h"


/*** SST39VF160 检查是否为空 ***
 扇区的值若为oxFF则判断为空 ****/
int SST39VF160_CheckBlank(U32 addr,U32 wordsize) //addr=0x081ff000;wordsize=2Kword
{
	U32 i,temp;
	for (i=addr;i<(addr+wordsize*2);i+=2)   //word=16bit
	{
		temp=*((volatile U16 *)(i));
		if(temp!=0xffff)
		  return 0;
	}
	return 1;	
}


/****** SST39VF160 的检测 ******
 Check if the bit6 bit7 toggle ends */
int Waitfor_endofprg(int addr)
{
	while(1)
	{
		U16 i;
		i = *((volatile U16 *)addr)&0x40;
		if(i!=*((volatile U16 *)addr)&0x40)	//D6 == D6
			continue;
		//if(*((volatile U16 *)addr)&0x80)	
			break;							//D7 == 1
	}
	return 1;
}


/*** SST39VF160 的写入操作，是一个word（16bit）写入的 ***/
int SST39VF160_WordProg (U32 addr,U16 dat)//addr=0x081ff000;data=0xaa55
{
	CMD_ADDR0 = 0xAA;
	CMD_ADDR1 = 0x55;
	CMD_ADDR0 = 0xA0;
    
    *((volatile U16 *)(addr)) = dat;
	return(Waitfor_endofprg(addr));
}

/*** SST39VF160 扇区擦除 ***/
void  SST39VF160_SectorErase(U32 section_addr)//section_addr=0x081ff000
{
	CMD_ADDR0 = 0xAA;
	CMD_ADDR1 = 0x55;
	CMD_ADDR0 = 0x80;
	CMD_ADDR0 = 0xAA;
	CMD_ADDR1 = 0x55;

	*((volatile U16 *)(section_addr)) = 0x30;
	Waitfor_endofprg(section_addr);
	
}
/*** SST39VF160读数据 ***/
U16 SST39VF160_WordRead(U32 addr)//addr=0x081ff000
{
	U16 data;
	data = *((volatile U16 *)(addr));
    return data;
}

/*** 读取SST39VF160的ID ***/
void SWPIDExit(void)
{
	CMD_ADDR0 = 0xf0;
}

///////////////////////////
void SWPIDEntry(void)
{
	CMD_ADDR0 = 0xaa;
	CMD_ADDR1 = 0x55;
	CMD_ADDR0 = 0x90;
}

///////////////////////////
U32  Get_SST39VF160_ID(void)
{
	U32 i=0;
	
	SWPIDEntry();
	i  = *(U16 *)(0+flash_base);
	i |= (*(U16 *)(2+flash_base))<<16;
	SWPIDExit();
	return i;
}