flashop_intel320_.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,bit32u dat,int timeoutloops);

#define FLASH_MAX_WAIT 200

/* The following are for the Intel 28FXXXC3 Flash Chips */
#define FLASH_READ_CMD		0x00FF00FF
#define FLASH_READ_CFG_CMD	0x00900090
#define FLASH_READ_STAT_CMD	0x00700070
#define FLASH_ERROR_MASK	0x001A001A
#define FLASH_WRITE_CMD		0x00400040
#define FLASH_CLEAR_SR_CMD	0x00500050
#define FLASH_ERASE_SECTOR	0x00200020 /* CMD 1 for erasing a sector */
#define FLASH_LOCK_CMD		0x00600060
#define FLASH_UNLOCK		0x00D000D0
#define FLASH_LOCK			0x00010001
#define FLASH_COMMIT_CMD	0x00D000D0
#define FLASH_WSMS			0x00800080 /* Write state machine state */

#define INTEL_FLASH_ID		0x00890089
/*#define INTEL_FLASH_8K		0x88C088C0
#define INTEL_FLASH_16K		0x88C288C2
#define INTEL_FLASH_32K		0x88C488C4*/
#define INTEL_FLASH_8K		0x88C088C1
#define INTEL_FLASH_16K		0x88C288C3
#define INTEL_FLASH_32K		0x88C488C5
#define FLASH2_OFFSET		0x00800000

#define FLASH_SECTOR_SIZE	   (128*1024)	/* How big is a "normal" sector */
#define FLASH_ENV_SECTOR_SIZE (16*1024)	/* How big is a environment sector */
#define EPLD_FLASH_WP		0x9C800008	/* EPLD register for Flash write protect */

bit32u FWBBaseAdr = 0;
int    FWBvalid = 0;
int    FWBopen=FALSE;
char   FWBwdata[64];
static bit32u flash_size[2] = {0,0}; /* We have at most 2 banks */
bit32u total_flash = 0;

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);
}

/* This function returns back a 0 if failure - no valid flash detected */
int FWBGet_flash_type()
{
	bit32u	flash_id;
	bit32u  flash_type;
  
	/* Figure out if we have the right flash chips */
	MEM_WRITE(CS0_BASE,FLASH_READ_CMD);
	MEM_WRITE(CS0_BASE,FLASH_READ_CFG_CMD);
	flash_id = MEM_READ(CS0_BASE);
	flash_type = MEM_READ(CS0_BASE+4);
	MEM_WRITE(CS0_BASE,FLASH_READ_CMD);

	if(flash_id != INTEL_FLASH_ID)
	{
		return(0); /* NOT what we expected */
	}
	
	switch(flash_type)
	{
		case INTEL_FLASH_8K:
				flash_size[0] = 2*1024*1024;
				break;
				
		case INTEL_FLASH_16K:
				flash_size[0] = 4*1024*1024;
				break;
				
		case INTEL_FLASH_32K:
				flash_size[0] = 8*1024*1024;
				break;
				
		default: /* Unknown type */
				return(0);				
	}
	total_flash = flash_size[0];
		
	/* Check if we have second bank populated */

	MEM_WRITE(CS0_BASE+FLASH2_OFFSET,FLASH_READ_CMD);
	MEM_WRITE(CS0_BASE+FLASH2_OFFSET,FLASH_READ_CFG_CMD);
	flash_id = MEM_READ(CS0_BASE+FLASH2_OFFSET);
	flash_type = MEM_READ(CS0_BASE+4+FLASH2_OFFSET);
	MEM_WRITE(CS0_BASE+FLASH2_OFFSET,FLASH_READ_CMD);
	
	/* Ok we do have some Intel flash... */
	if(flash_id == INTEL_FLASH_ID)
	{
	
		switch(flash_type)
		{
			case INTEL_FLASH_8K:
					flash_size[1] = 2*1024*1024;
					break;
					
			case INTEL_FLASH_16K:
					flash_size[1] = 4*1024*1024;
					break;
					
			case INTEL_FLASH_32K:
					flash_size[1] = 8*1024*1024;
					break;
					
			default: /* Unknown type */
					flash_size[1] = 0;
					break;
		}		
		total_flash += flash_size[1];			
	}
	return(total_flash);
}

int FWBUnLock(bit32u adr,bit32 size)
  {
  bit32u *uip,uitmp;
  int sts;

  uip=(bit32u *)adr;
  uitmp=*uip;
  MEM_WRITE(adr,FLASH_LOCK_CMD);
  MEM_WRITE(adr,FLASH_UNLOCK);
  sts=_FlashOperationComplete(adr,uitmp,700000*FLASH_MAX_WAIT);
  _FlashErrorOut("UnLock Block",sts);
  return(sts==0);
  }

/*Returns TRUE for success and FALSE for failure                                  */