//====================================================================
// File Name : strata32.c
// Function  : S3C2440 Intel Strata NOR Flash
// Program   : Lee, Sang Jo (LSJ)
// Date      : June 14, 2002
// Version   : 0.0
// History
//   0.0 : Programming start (June 14, 2002) -> LSJ
//         Arrangement source code(8/01/2002)-> SOP   
//====================================================================

#include <stdlib.h>
#include <string.h>
#include "def.h"
#include "option.h"
#include "2410addr.h"
#include "2410lib.h"
#include "2410slib.h"
#include "strata32.h"

static void InputAddresses(void);

static int  Strata_ProgFlash(U32 realAddr,U16 data);
static void Strata_EraseSector(int targetAddr);
static int  Strata_CheckID(int targetAddr);
static int  Strata_CheckDevice(int targetAddr);
static int  Strata_CheckBlockLock(int targetAddr);
static int  Strata_BlankCheck(int targetAddr,int targetSize);
//static int  Strata_Display(int targetAddr,int targetSize);

extern U32 downloadAddress;
extern U32 downloadProgramSize;

static U32 srcAddress;
static U32 targetOffset; 
static U32 targetAddress; 
static U32 targetSize; 

// Because S3C2440 is connected to Intel StrataFlash 28F128J3A,
// the addr parameter has to be a WORD address, so called in Intel specification.

    // by chc
#define _WR(addr,data)  *((volatile U16 *)(addr))=(U16)data 
#define _RD(addr)       ( *((volatile U16 *)(addr)) )       
    // _RESET() : Read Array
#define _RESET()    _WR(targetAddress,0x00ff)

extern U32 downloadAddress;
extern U32 downloadProgramSize;

static int error_erase=0;       // Read Status Register, SR.5
static int error_program=0;     // Read Status Register, SR.4

//==========================================================================================
int Strata_CheckID(int targetAddr) 
{
    _RESET();
    _WR(targetAddr, 0x0090); 
    return _RD(targetAddr); // Read Identifier Code, including lower, higher 16-bit, 8MB, Intel Strate Flash ROM
                            // targetAddress must be the beginning location of a Block Address
}

//==========================================================================================
int Strata_CheckDevice(int targetAddr) 
{
    _RESET();
    _WR(targetAddr, 0x0090);
    return _RD(targetAddr+0x2); // Read Device Code, including lower, higher 16-bit, 8MB, Intel Strate Flash ROM
                                // targetAddress must be the beginning location of a Block Address
}

//==========================================================================================
int Strata_CheckBlockLock(int targetAddr) 
{
    _RESET();
    _WR(targetAddr, 0x0090);
    return _RD(targetAddr+0x4); // Read Block Lock configuration, 
                                // targetAddress must be the beginning location of a Block Address
}

void Strata_Unlock(int targetAddr) 
{
    _RESET();
    _WR(targetAddr, 0x0060);
    _WR(targetAddr, 0x00D0);
}

void Strata_SetBlockLock(int targetAddr)
{
	_RESET();
	_WR(targetAddr, 0x0060);
	_WR(targetAddr, 0x0001);
}

//==========================================================================================
void Strata_EraseSector(int targetAddress) 
{
    unsigned long ReadStatus;
    unsigned long bSR5;     // Erase and Clear Lock-bits Status, lower 16bit, 8MB Intel Strate Flash ROM
    unsigned long bSR7;     // Write State Machine Status, lower 16bit, 8MB Intel Strate Flash ROM
    _RESET();

    _WR(targetAddress, 0x0020); // Block Erase, First Bus Cycle, targetAddress is the address withint the block
    _WR(targetAddress, 0x00d0); // Block Erase, Second Bus Cycle, targetAddress is the address withint the block
    
    _RESET();
    _WR(targetAddress, 0x0070); // Read Status Register, First Bus Cycle, targetAddress is any valid address within the device
    ReadStatus=_RD(targetAddress);  // Read Status Register, Second Bus Cycle, targetAddress is any valid address within the device
    bSR7=ReadStatus & (1<<7);       // lower 16-bit 8MB Strata
    while(!bSR7 ) 
    {
        _WR(targetAddress, 0x0070);
        ReadStatus=_RD(targetAddress);
        bSR7=ReadStatus & (1<<7);
//      Uart_Printf("wait !!\n");
    }

    _WR(targetAddress, 0x0070); // When the block erase is complete, status register bit SR.5 should be checked. 
                    // If a block erase error is detected, the status register should be cleared before
                    // system software attempts correct actions.
    ReadStatus=_RD(targetAddress);  
    bSR5=ReadStatus & (1<<5);           // lower 16-bit 8MB Strata 
    if (bSR5==0 ) 
    {
        Uart_Printf("Block_%x Erase O.K. \n",targetAddress);
    } 
    else 
    {
        Uart_Printf("Error in Block Erasure!!\n");
        _WR(targetAddress, 0x0050); 	// Clear Status Register
        error_erase=1;                  // But not major, is it casual ?
    }

    _RESET();   // write 0xffh(_RESET()) after the last opoeration to reset the device to read array mode.
}

//==========================================================================================
int Strata_BlankCheck(int targetAddr,int targetSize) 
{
    int i,j;
    //
    _RESET();
    for (i=0; i<targetSize; i+=2) 
    {
        j=(*((volatile U16 *)(i+targetAddr))) & 0xffff;
        if (j!=0xffff)      // In erasure it changes all block dta to 0xff
        {
            Uart_Printf("E : %x = %x\n", (i+targetAddr), j);
            return 0;
        }
    }
    return 1;
}

//==========================================================================================
int Strata_ProgFlash(U32 realAddr,U16 data) 
{
    volatile U16 *ptargetAddr;
    unsigned long ReadStatus;
    unsigned long bSR4;    // Erase and Clear Lock-bits Status, lower 16bit, 8MB Intel Strate Flash ROM
    unsigned long bSR7;    // Write State Machine Status, lower 16bit, 8MB Intel Strate Flash ROM

    ptargetAddr = (volatile U16 *)realAddr;
    //
    _RESET();

    _WR(realAddr, 0x0040);  // realAddr is any valid adress within the device
                                // Word/Byte Program(or 0x00100010 can be used)
    *ptargetAddr=data;          // 32 bit data

    //
    _RESET();
    _WR(realAddr, 0x0070);  // Read Status Register
    ReadStatus=_RD(realAddr);   // realAddr is any valid address within the device
    bSR7=ReadStatus & (1<<7);
    while(!bSR7 ) 
    {
        //
         _RESET();
        _WR(realAddr, 0x0070);        // Read Status Register
        ReadStatus=_RD(realAddr);
        bSR7=ReadStatus & (1<<7);
    }
    
    _WR(realAddr, 0x0070); 
    ReadStatus=_RD(realAddr);             // Real Status Register
    bSR4=ReadStatus & (1<<4);
    
    if (bSR4==0 ) 
    {
        //Uart_Printf("Successful Program!!\n");
    } 
    else 
    {
        Uart_Printf("Error Program!!\n");
        _WR(realAddr, 0x0050);          // Clear Status Register
        error_program=1;                    // But not major, is it casual ?
    }

    _RESET();
    return 0;
}

#define TARGET_ADDR_28F128      0x00000000  // nGCS4, 128MB area
#define SOURCE_ADDR_FOR_28F128  0x31000000  // After 16MB of SDRAM
                                            // 0x30000000 - 0x30ffffff : Area for this test program

//==========================================================================================                                            
void Program28F128J3A(void)
{
// FlashROM write program must reside at RAM region NOT ROM region
// In reading and writing all interrupts are disabled because the flash ROM
// strongly dislike to be disturbed by other stuff.
// And the region of flash ROM must be I/O region which means NO cacheable
// and NO bufferable in MMU. Check it out !!!
// 2001.6.18. Mon. It's local rain. I'll hope it eliminates the drought in Korea. by chc

    int i, id1, id2;

    Uart_Printf("\n[ Intel 28F320J3A Flash Writing Program ]\n\n");

    rINTMSK = BIT_ALLMSK;   
    targetAddress=TARGET_ADDR_28F128;
    targetSize=downloadProgramSize;

    srcAddress=downloadAddress;
    if(targetSize==0)
    {
        Uart_Printf("\nThe data must be downloaded using XMODEM from 0x31000000\n");
        return;
    }

    InputAddresses(); //srcAddress,targetSize,targetOffset will be determined.      
    Uart_Printf("Source base address(0x31000000) = 0x%x\n",srcAddress);
    Uart_Printf("Target base address(0x00000000) = 0x%x\n",targetAddress);
    Uart_Printf("Target offset      (0x0)        = 0x%x\n",targetOffset);
    Uart_Printf("Target size        (0x20000*n)  = 0x%x\n",targetSize);