intel_j3_1x16.c

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//**********************************************************************
//                                                                      
// Filename: intelj3_1x16.c
//                                                                      
// Description: Flashing program for intel j3.  One j3 flash chips
//  in 16 bit mode.
//
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// Use of this source code is subject to the terms of the Cirrus end-user
// license agreement (EULA) under which you licensed this SOFTWARE PRODUCT.
// If you did not accept the terms of the EULA, you are not authorized to 
// use this source code. For a copy of the EULA, please see the 
// EULA.RTF on your install media.
//
// Copyright(c) Cirrus Logic Corporation 2005, All Rights Reserved                       
//                                                                      
//**********************************************************************
#include <windows.h>
#include <hwdefs.h>
#include <halether.h>
#include <debugtimer.h>
#include "intel_j3_1x16.h"


//
// Definitions for Flash erasing.
//
#define     FLASH_BLOCK_SIZE            0x20000
#define     FLASH_BLOCK_MASK            ~(FLASH_BLOCK_SIZE - 1)
#define     FLASH_BUFFER_SIZE           32
#define     FLASH_READ_MODE             0x00FF
#define     FLASH_BLOCK_ERASE           0x0020
#define     FLASH_CLEAR_STATUS          0x0050
#define     FLASH_BLOCK_ERASE_RESUME    0x00d0
#define     FLASH_BLOCK_PROGRAM_RESUME  0x00d0
#define     FLASH_WRITE_TO_BUFFER       0x00E8
#define     FLASH_READ_STATUS           0x0070
#define     FLASH_LOCK_BIT              0x0060
#define     FLASH_LOCK_SET              0x0001
#define     FLASH_LOCK_CLEAR            0x00d0


#define     STATUS_WRITE_READY          0x0080
#define     EXT_STATUS_WBUFFER_READY    0x0080


static DWORD    gdwStartAddr            = 0;
static DWORD    gdwLength               = 0;
static volatile PUSHORT  gpusCurAddr    = 0;
static BOOL     gbFlashEraseComplete    = FALSE;
static BOOL     gbUnlocked              = TRUE;



//
// Private functions.
//
static BOOL  WaitForReady(volatile USHORT *pusFlash, ULONG ulTimeoutInMsec, USHORT ulBitField);

//****************************************************************************
// StartEraseFlashJ3_1x16
//****************************************************************************
//  dwStartAddr - Start address, in flash, to start erasing from. The 
//                platform loader code needs to ensure this is a flash 
//                block-aligned address or needs to handle it specially if 
//                it is not. 
//
//  dwLength    - Number of bytes of flash to be erased. 
//
//  return      TRUE indicates success. FALSE indicates failure.
//
BOOL StartEraseFlashJ3_1x16(DWORD dwStartAddr, DWORD dwLength)
{
    //
    // Make sure that the flash addresses are valid.
    //
    if(dwStartAddr + dwLength >FLASH_VIRTUAL_MEMORY + FLASH_SIZE  || 
       dwStartAddr < FLASH_VIRTUAL_MEMORY )
    {

        EdbgOutputDebugString
        (
            "ERROR: No Flash located in the locations from %x to %xr\r\n",
            dwStartAddr,
            dwLength
        );
        return FALSE;
    }

    //
    // Check to make sure that the flash is on a Block boundary.
    //
    if(dwStartAddr  & (FLASH_BLOCK_SIZE - 1))
    {

        EdbgOutputDebugString
        (
            "ERROR: Address %x is not on a flash block boundary.\r\n",
            dwStartAddr
        );
        return FALSE;
    }

    //
    // Save off the start address and the length.
    //
    gdwStartAddr    = dwStartAddr;
    gdwLength       = dwLength;
    gpusCurAddr     = (PUSHORT) dwStartAddr;

    //
    // Put the flash in read mode to make sure that we are not in the middle 
    // of a command.
    //
    *gpusCurAddr = FLASH_READ_MODE;

    //
    // Clear the lock bit.
    //
    *gpusCurAddr = FLASH_LOCK_BIT;
    *gpusCurAddr = FLASH_LOCK_CLEAR;
    *gpusCurAddr = FLASH_READ_STATUS;
    gbUnlocked  = TRUE;

    return TRUE;
}

//****************************************************************************
// ContinueEraseFlashJ3_1x16
//****************************************************************************
// Continues the flash erasing processes for J3 Flash.  See 
// OEMContinueEraseFlash for Parameter description.
// 
//
void ContinueEraseFlashJ3_1x16(void)
{
    //
    // Check to see if the flash has been completely erased. If so just
    // return.
    //
    if(gbFlashEraseComplete)
    {
        return;
    }

    //
    // Check to see if the last block has been erased.
    //
    if((*gpusCurAddr & EXT_STATUS_WBUFFER_READY) != EXT_STATUS_WBUFFER_READY)
    {
        return;
    }

    //
    // Clear Status.
    //
    *gpusCurAddr  = FLASH_CLEAR_STATUS;

    if(gbUnlocked)
    {
        //
        // Erase the flash block
        //
        *gpusCurAddr = FLASH_BLOCK_ERASE;
        *gpusCurAddr = FLASH_BLOCK_ERASE_RESUME;

        //
        // Read erase status.
        //
        *gpusCurAddr = FLASH_READ_STATUS;
        gbUnlocked   = FALSE;
    }
    else
    {
        //
        // Check to see if we have finished erasing the flash memory.
        //
        if(gdwStartAddr + gdwLength < ((DWORD)gpusCurAddr) + FLASH_BLOCK_SIZE)
        {
            gbFlashEraseComplete = TRUE;
            return;
        }

        //
        // Advance to the next block.
        //
        gpusCurAddr+= FLASH_BLOCK_SIZE>>1;

        //
        // Clear the lock bits if the flash block was locked.
        //
        *gpusCurAddr = FLASH_LOCK_BIT;
        *gpusCurAddr = FLASH_LOCK_CLEAR;
        *gpusCurAddr = FLASH_READ_STATUS;

        gbUnlocked  = TRUE;
    }

}

//****************************************************************************
// FinishEraseFlashJ3_1x16
//****************************************************************************
// Finishes the flash eraseing processes for J3 Flash.  See 
// OEMFinishEraseFlash for paramter description.
//
BOOL  FinishEraseFlashJ3_1x16 (void)
{
    BOOL    bSuccess;
    //
    // Check to see if the flash has been completely erased. If so just
    // return.
    //
    if(gbFlashEraseComplete)
    {
        return TRUE;
    }

    //
    // Wait for the Flash block command to succeed.
    //
    bSuccess = WaitForReady(gpusCurAddr, 10000, EXT_STATUS_WBUFFER_READY);
    if(bSuccess == FALSE)
    {
        return FALSE;
    }

    *gpusCurAddr  = FLASH_CLEAR_STATUS;

    //
    // Erase the block before unlocking the next block.
    //
    if(gbUnlocked)
    {
        //
        // Erase the flash block
        //
        *gpusCurAddr = FLASH_BLOCK_ERASE;
        *gpusCurAddr = FLASH_BLOCK_ERASE_RESUME;

        //
        // Read erase status.
        //
        *gpusCurAddr = FLASH_READ_STATUS;

        //
        // Wait for the Flash block command to succeed.
        //
        bSuccess = WaitForReady(gpusCurAddr, 10000, EXT_STATUS_WBUFFER_READY);
        if(bSuccess == FALSE)
        {
            return FALSE;
        }

        *gpusCurAddr    = FLASH_CLEAR_STATUS;
        gbUnlocked      = FALSE;

        //
        // Increment to the next block.
        //
        gpusCurAddr += FLASH_BLOCK_SIZE>>1;
    }


    //
    // Erase the Flash
    //
    while((DWORD)gpusCurAddr < (gdwStartAddr + gdwLength))
    {

        //
        // Clear the lock bits if the flash block was locked.
        //
        *gpusCurAddr = FLASH_LOCK_BIT;
        *gpusCurAddr = FLASH_LOCK_CLEAR;
        *gpusCurAddr = FLASH_READ_STATUS;

        //
        // Wait for the Flash block command to succeed.
        //
        bSuccess = WaitForReady(gpusCurAddr, 10000, EXT_STATUS_WBUFFER_READY);
        *gpusCurAddr  = FLASH_CLEAR_STATUS;
        
        if(!bSuccess)
        {
            break;
        }


        //
        // Erase the flash block
        //
        *gpusCurAddr = FLASH_BLOCK_ERASE;
        *gpusCurAddr = FLASH_BLOCK_ERASE_RESUME;
        *gpusCurAddr = FLASH_READ_STATUS;
        
        //
        // Wait for the Flash block command to succeed.
        //
        bSuccess = WaitForReady(gpusCurAddr, 10000, EXT_STATUS_WBUFFER_READY);
        *gpusCurAddr  = FLASH_CLEAR_STATUS;
        
        if(!bSuccess)
        {
            break;
        }

        //
        // Occasionally write out a dot so they don't think
        // the system is dead.
        //
        EdbgOutputDebugString(".");
        
        //
        // Increment to the next block.
        //
        gpusCurAddr += FLASH_BLOCK_SIZE>>1;
    }        

    return bSuccess;

}

#if 0
//****************************************************************************
// WriteFlashJ3_1x16
//****************************************************************************
//  Writes to J3 Flash.  Different from parameters than  OEMWriteFlash.
//