nfc.cpp

来自「freescale i.mx31 BSP CE5.0全部源码」· C++ 代码 · 共 114 行

//------------------------------------------------------------------------------
//
//  Copyright (C) 2006, Freescale Semiconductor, Inc. All Rights Reserved
//  THIS SOURCE CODE IS CONFIDENTIAL AND PROPRIETARY AND MAY NOT
//  BE USED OR DISTRIBUTED WITHOUT THE WRITTEN PERMISSION OF
//  Freescale Semiconductor, Inc.
//
//------------------------------------------------------------------------------
#include "bsp.h"


//-----------------------------------------------------------------------------
// External Functions


//-----------------------------------------------------------------------------
// External Variables
extern "C" PCSP_NANDFC_REGS g_pNFC;


//-----------------------------------------------------------------------------
// Defines


//-----------------------------------------------------------------------------
// Types


//-----------------------------------------------------------------------------
// Global Variables


//-----------------------------------------------------------------------------
// Local Variables


//-----------------------------------------------------------------------------
// Local Functions


//-----------------------------------------------------------------------------
//
//  Function: NFCAlloc
//
//  This function maps the NFC peripheral, configures interupts, and
//  configures NFC DMA support.
//
//  Parameters:
//      None.
//
//  Returns:
//      Returns TRUE on success. Returns FALSE on failure.
//
//-----------------------------------------------------------------------------
BOOL NFCAlloc(VOID)
{
    // Map peripheral physical address to virtual address
    g_pNFC = (PCSP_NANDFC_REGS) OALPAtoUA(CSP_BASE_REG_PA_NANDFC);

    // Check if virtual mapping failed
    if (g_pNFC == NULL)
    {
        OALMSG(1, (_T("NFCAlloc:  MmMapIoSpace failed!\r\n")));
        return FALSE;
    }
 
    return TRUE;   
}

//-----------------------------------------------------------------------------
//
//  Function:  NFCWait
//
//  This functions waits for the pending NANDFC opeation to complete.  
//
//  Parameters:
//      bPoll
//          [in] - Ignored.  Bootloader always polls for completion.
//
//  Returns:
//      None.
//
//-----------------------------------------------------------------------------
VOID NFCWait(BOOL bPoll)
{
    while (!(INREG16(&g_pNFC->NAND_FLASH_CONFIG2) & CSP_BITFMASK(NANDFC_NAND_FLASH_CONFIG2_INT)));
    
    // Clear the NANDFC interrupt
    CLRREG16(&g_pNFC->NAND_FLASH_CONFIG2, 
             CSP_BITFMASK(NANDFC_NAND_FLASH_CONFIG2_INT));

}


//-----------------------------------------------------------------------------
//
//  Function:  NFCSetClock
//
//  This enables/disable clocks for the NANDFC.
//
//  Parameters:
//      None.
//
//  Returns:
//      Returns TRUE on success. Returns FALSE on failure.
//
//-----------------------------------------------------------------------------
BOOL NFCSetClock(BOOL bEnabled)
{
    // Bootloader does not use clock gating, just return success
    return TRUE;
}