system.c

嵌入式操作系统WINCE5.0下的USB驱动程序

        dwHPPhysicalMemSize = pPddObject->dwPhysicalMemSize/4;
        // Align with page size.        
        pPddObject->dwPhysicalMemSize = (pPddObject->dwPhysicalMemSize + PAGE_SIZE -1) & ~(PAGE_SIZE -1);
        dwHPPhysicalMemSize = ((dwHPPhysicalMemSize +  PAGE_SIZE -1) & ~(PAGE_SIZE -1));
    }
    else 
        pPddObject->dwPhysicalMemSize=0;
    
    if (pPddObject->dwPhysicalMemSize<gcTotalAvailablePhysicalMemory) { // Setup Minimun requirement.
        pPddObject->dwPhysicalMemSize = gcTotalAvailablePhysicalMemory;
        dwHPPhysicalMemSize = gcHighPriorityPhysicalMemory;
    }

    pPddObject->AdapterObject.ObjectSize = sizeof(DMA_ADAPTER_OBJECT);
    pPddObject->AdapterObject.InterfaceType = dwi.dwInterfaceType;
    pPddObject->AdapterObject.BusNumber = dwi.dwBusNumber;
    if ((pPddObject->pvVirtualAddress = HalAllocateCommonBuffer(&pPddObject->AdapterObject, pPddObject->dwPhysicalMemSize, &pPddObject->LogicalAddress, FALSE)) == NULL) {
        goto InitializeEHCI_Error;
    }
    if (!(pobMem = HcdMdd_CreateMemoryObject(pPddObject->dwPhysicalMemSize, dwHPPhysicalMemSize, (PUCHAR) pPddObject->pvVirtualAddress, (PUCHAR) pPddObject->LogicalAddress.LowPart))) {
        goto InitializeEHCI_Error;
    }

    if (!(pobEHCD = HcdMdd_CreateHcdObject(pPddObject, pobMem, szDriverRegKey, ioPortBase, dii.dwSysintr))) {
        goto InitializeEHCI_Error;
    }

    pPddObject->lpvMemoryObject = pobMem;
    pPddObject->lpvEHCDMddObject = pobEHCD;
    _tcsncpy(pPddObject->szDriverRegKey, szDriverRegKey, MAX_PATH);
    pPddObject->ioPortBase = ioPortBase;
    pPddObject->dwSysIntr = dii.dwSysintr;
    
    if ( hKey!=NULL)  {
        DWORD dwCapability;
        DWORD dwType;
        DWORD dwLength = sizeof(DWORD);
        if (RegQueryValueEx(hKey, HCD_CAPABILITY_VALNAME, 0, &dwType, (PUCHAR)&dwCapability, &dwLength) == ERROR_SUCCESS)
            HcdMdd_SetCapability (pobEHCD,dwCapability);
        RegCloseKey(hKey);
    }

    return TRUE;

InitializeEHCI_Error:
    if (pPddObject->IsrHandle) {
        FreeIntChainHandler(pPddObject->IsrHandle);
        pPddObject->IsrHandle = NULL;
    }
    
    if (pobEHCD)
        HcdMdd_DestroyHcdObject(pobEHCD);
    if (pobMem)
        HcdMdd_DestroyMemoryObject(pobMem);
    if(pPddObject->pvVirtualAddress)
        HalFreeCommonBuffer(&pPddObject->AdapterObject, pPddObject->dwPhysicalMemSize, pPddObject->LogicalAddress, pPddObject->pvVirtualAddress, FALSE);

    pPddObject->lpvMemoryObject = NULL;
    pPddObject->lpvEHCDMddObject = NULL;
    pPddObject->pvVirtualAddress = NULL;
    if ( hKey!=NULL) 
        RegCloseKey(hKey);

    return FALSE;
}

/* HcdPdd_Init
 *
 *   PDD Entry point - called at system init to detect and configure EHCI card.
 *
 * Return Value:
 *   Return pointer to PDD specific data structure, or NULL if error.
 */
extern DWORD 
HcdPdd_Init(
    DWORD dwContext)  // IN - Pointer to context value. For device.exe, this is a string 
                      //      indicating our active registry key.
{
    SEHCDPdd *  pPddObject = malloc(sizeof(SEHCDPdd));
    BOOL        fRet = FALSE;

    if (pPddObject) {
        pPddObject->pvVirtualAddress = NULL;
        InitializeCriticalSection(&pPddObject->csPdd);
        pPddObject->IsrHandle = NULL;
        pPddObject->hParentBusHandle = CreateBusAccessHandle((LPCWSTR)g_dwContext); 
        
        fRet = InitializeEHCI(pPddObject, (LPCWSTR)dwContext);

        if(!fRet)
        {
            if (pPddObject->hParentBusHandle)
                CloseBusAccessHandle(pPddObject->hParentBusHandle);
            
            DeleteCriticalSection(&pPddObject->csPdd);
            free(pPddObject);
            pPddObject = NULL;
        }
    }

    return (DWORD)pPddObject;
}

/* HcdPdd_CheckConfigPower
 *
 *    Check power required by specific device configuration and return whether it
 *    can be supported on this platform.  For CEPC, this is trivial, just limit to
 *    the 500mA requirement of USB.  For battery powered devices, this could be 
 *    more sophisticated, taking into account current battery status or other info.
 *
 * Return Value:
 *    Return TRUE if configuration can be supported, FALSE if not.
 */
extern BOOL HcdPdd_CheckConfigPower(
    UCHAR bPort,         // IN - Port number
    DWORD dwCfgPower,    // IN - Power required by configuration
    DWORD dwTotalPower)  // IN - Total power currently in use on port
{
    return ((dwCfgPower + dwTotalPower) > 500) ? FALSE : TRUE;
}

extern void HcdPdd_PowerUp(DWORD hDeviceContext)
{
    SEHCDPdd * pPddObject = (SEHCDPdd *)hDeviceContext;
    HcdMdd_PowerUp(pPddObject->lpvEHCDMddObject);

    return;
}

extern void HcdPdd_PowerDown(DWORD hDeviceContext)
{
    SEHCDPdd * pPddObject = (SEHCDPdd *)hDeviceContext;

    HcdMdd_PowerDown(pPddObject->lpvEHCDMddObject);

    return;
}


extern BOOL HcdPdd_Deinit(DWORD hDeviceContext)
{
    SEHCDPdd * pPddObject = (SEHCDPdd *)hDeviceContext;

    if(pPddObject->lpvEHCDMddObject)
        HcdMdd_DestroyHcdObject(pPddObject->lpvEHCDMddObject);
    if(pPddObject->lpvMemoryObject)
        HcdMdd_DestroyMemoryObject(pPddObject->lpvMemoryObject);
    if(pPddObject->pvVirtualAddress)
        HalFreeCommonBuffer(&pPddObject->AdapterObject, pPddObject->dwPhysicalMemSize, pPddObject->LogicalAddress, pPddObject->pvVirtualAddress, FALSE);

    if (pPddObject->IsrHandle) {
        FreeIntChainHandler(pPddObject->IsrHandle);
        pPddObject->IsrHandle = NULL;
    }
    
    if (pPddObject->hParentBusHandle)
        CloseBusAccessHandle(pPddObject->hParentBusHandle);
    
    free(pPddObject);
    return TRUE;
    
}


extern DWORD HcdPdd_Open(DWORD hDeviceContext, DWORD AccessCode,
        DWORD ShareMode)
{
    UnusedParameter(hDeviceContext);
    UnusedParameter(AccessCode);
    UnusedParameter(ShareMode);

    return 1; // we can be opened, but only once!
}


extern BOOL HcdPdd_Close(DWORD hOpenContext)
{
    UnusedParameter(hOpenContext);

    return TRUE;
}


extern DWORD HcdPdd_Read(DWORD hOpenContext, LPVOID pBuffer, DWORD Count)
{
    UnusedParameter(hOpenContext);
    UnusedParameter(pBuffer);
    UnusedParameter(Count);

    return (DWORD)-1; // an error occured
}


extern DWORD HcdPdd_Write(DWORD hOpenContext, LPCVOID pSourceBytes,
        DWORD NumberOfBytes)
{
    UnusedParameter(hOpenContext);
    UnusedParameter(pSourceBytes);
    UnusedParameter(NumberOfBytes);

    return (DWORD)-1;
}


extern DWORD HcdPdd_Seek(DWORD hOpenContext, LONG Amount, DWORD Type)
{
    UnusedParameter(hOpenContext);
    UnusedParameter(Amount);
    UnusedParameter(Type);

    return (DWORD)-1;
}


extern BOOL HcdPdd_IOControl(DWORD hOpenContext, DWORD dwCode, PBYTE pBufIn,
        DWORD dwLenIn, PBYTE pBufOut, DWORD dwLenOut, PDWORD pdwActualOut)
{
    UnusedParameter(hOpenContext);
    UnusedParameter(dwCode);
    UnusedParameter(pBufIn);
    UnusedParameter(dwLenIn);
    UnusedParameter(pBufOut);
    UnusedParameter(dwLenOut);
    UnusedParameter(pdwActualOut);

    return FALSE;
}


// Manage WinCE suspend/resume events

// This gets called by the MDD's IST when it detects a power resume.
// By default it has nothing to do.
extern void HcdPdd_InitiatePowerUp (DWORD hDeviceContext)
{
    return;
}