flashop_intel640c3_.c

ADAM2 sources (modified by Oleg)

/*-----------------------------------------------------------------------------*/
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/*  c/o ADAM2 Application Manager                                              */
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/*-----------------------------------------------------------------------------*/
/*                                                                             */
/*  Now that you've gotten here you are probably serious about understanding   */
/*  the way Adam2 uses the flash. All flash operations are contained in this   */
/*  module. There are 7 interfaces to this module. FWBGetBlockSize, FWBErase,  */
/*  FWBOpen, FWBWriteByte, and FWBClose, FWBUnLock, FWBLock.                   */                                                                             
/*  FWBGetBlockSize(base);       - returns the Flash Block size for the        */
/*                                 requested region so that all users of the   */
/*                                 flash understand the blocking factor.       */
/*                                                                             */
/*  FWBErase(base,size,verbose); - Erases from base address of size in blocks. */
/*                                                                             */
/*  FWBOpen(Base);               - Will always be called prior to FWBWriteByte,*/
/*                                 and is responsible for unlocking the region */
/*                                 and preparing for flash writes.             */
/*                                                                             */
/*  FWBWriteByte(address,data);  - Is called to write data to the flash        */
/*                                 address, remember that a FWBClose will be   */
/*                                 called prior to any use of the written data.*/
/*                                                                             */
/*  FWBClose()                   - Will complete any pending flash writes to a */
/*                                 region, and lock the flash.                 */
/*                                                                             */
/*  FWBUnLock(base,size)         - Unlocks the blocks specified                */
/*                                                                             */
/*  FWBLock(base,size)           - Lock the blocks specified                   */
/*                                                                             */
/*  The use of FWBOpen, FWBWriteByte, and FWBClose allows for efficient block  */
/*  writes. Remember it is possible to only get One FWBWriteByte in-between a  */
/*  FWBOpen and a FWBClose.                                                    */
/*                                                                             */
/*  During the Boot process the FWBGetBlockSize is called. This block can be   */
/*  called at any time, and returns the size of the flash blocks for the       */
/*  requested region. It is possible to have different size flash blocks in    */
/*  different memory regions.                                                  */
/*                                                                             */
/*  Any time the Kernel wishes to erase a block of flash, it will call the     */
/*  FWBErase routine. The routine is assumed to erase in blocks. That is       */
/*  FWBErase(CS0_BASE,1,0); will erase the block at CS0_BASE. The same can be  */
/*  said for FWBErase(CS0_BASE,FWBGetBlockSize(CS0_BASE),0); So that           */
/*  FWBErase(CS0_BASE,FWBGetBlockSize(CS0_BASE)+1,0); and                      */
/*  FWBErase(CS0_BASE+1,FWBGetBlockSize(CS0_BASE),0); actually erases 2 blocks.*/
/*                                                                             */
/*  It is important to not that the FWBXxxxx routines must always leave the    */
/*  flash in a read mode. Failure to do this will result in a system hang.     */
/*  sys_printf () is also unuasable whilest the flash in not in a read mode    */
/*                                                                             */
/*  And last but not least, all FWB... routines return TRUE if successfull and */
/*  FALSE if unsuccessfull                                                     */
/*                                                                             */
/*-----------------------------------------------------------------------------*/
#include "_stdio.h"
#include "flashop.h"
#include "hw.h"

void _FlashErrorOut(char *str,int sts);
int _FWBWriteBlock(void);
int _FlashOperationComplete(bit32u adr, bit16u dat, int timeoutloops);

#define FLASH_MAX_WAIT 		125
#define MAXBUF 				2

/* The following are for the Intel 28FXXXC3 Flash Chips */
#define FLASH_READ_CMD		0x00FF
#define FLASH_READ_CFG_CMD	0x0090
#define FLASH_READ_STAT_CMD	0x0070
#define FLASH_ERROR_MASK	0x003A
#define FLASH_WRITE_CMD		0x0040
#define FLASH_CLEAR_SR_CMD	0x0050
#define FLASH_ERASE_SECTOR	0x0020 /* CMD 1 for erasing a sector */
#define FLASH_LOCK_CMD		0x0060
#define FLASH_UNLOCK		0x00D0
#define FLASH_LOCK			0x0001
#define FLASH_COMMIT_CMD	0x00D0
#define FLASH_WSMS			0x0080 /* Write state machine state */

bit32u FWBBaseAdr, FWBBaseUnLockAdr;
int    FWBvalid;
int    FWBopen=FALSE;
char   FWBwdata[MAXBUF];

int FWBValid(bit32u base)
{
	base&=0x1fffffff;
	base|=0xa0000000;

	if (base < (CS0_BASE + MIN_BOOT_BLOCK_SIZE))		
		return(0);
	
	if (base >= (CS0_BASE + CS0_SIZE))
		return(0);

	return (1);
}

void UnLock(bit32u adr)
{
	FWBBaseUnLockAdr=adr;
	MEM_WRITE16(adr,FLASH_LOCK_CMD);
	MEM_WRITE16(adr,FLASH_UNLOCK);
	MEM_WRITE16(adr,FLASH_READ_CMD);
}

void Lock(void)
{
	MEM_WRITE16(FWBBaseUnLockAdr,FLASH_LOCK_CMD);
	MEM_WRITE16(FWBBaseUnLockAdr,FLASH_LOCK);
    MEM_WRITE16(FWBBaseUnLockAdr,FLASH_READ_CMD);
}

int FWBUnLock(bit32u adr,bit32 size)
{	
    bit32u i,sts,blocksize,from,to;


    if (size==0) 
	return(0);

    size--;
    from=adr;
    blocksize=FWBGetBlockSize(from);
    if (blocksize==0)