/*
*********************************************************************************************************
*                                              uC/TCP-IP
*                                      The Embedded TCP/IP Suite
*
*                          (c) Copyright 2003-2006; Micrium, Inc.; Weston, FL
*
*                   All rights reserved.  Protected by international copyright laws.
*                   Knowledge of the source code may not be used to write a similar
*                   product.  This file may only be used in accordance with a license
*                   and should not be redistributed in any way.
*********************************************************************************************************
*/

/*
*********************************************************************************************************
*
*                                        NETWORK INTERFACE CARD
*
*                                      STR91x MAC/DMA Controller
*
* Filename      : net_nic.c
* Version       : V1.00
*********************************************************************************************************
*/

/*
*********************************************************************************************************
*                                            INCLUDE FILES
*********************************************************************************************************
*/

#define    NET_NIC_MODULE

#include  "includes.h"
#include  "net_nic.h"

/*
*********************************************************************************************************
*                                             VARIABLES
*********************************************************************************************************
*/

static  ENET_MACConfig  NIC_Config;

/*
*********************************************************************************************************
*                                      Local Function Prototypes
*********************************************************************************************************
*/

static  void        NetNIC_TxPktDiscard      (NET_ERR      *perr);

static  void        MAC_Init                 (void);

/*
*********************************************************************************************************
*                                            NetNIC_Init()
*
* Description : (1) Initialize Network Interface Card :
*
*                   (a) Perform NIC Layer OS initialization
*                   (b) Initialize NIC status
*                   (c) Initialize NIC statistics & error counters
*                   (d) Initialize STR91x MAC
*
* Argument(s) : perr        Pointer to variable that will hold the return error code from this function :
*
*                               NET_NIC_ERR_NONE                    Network interface card successfully initialized.
*
*                                                                   -------- RETURNED BY NetOS_NIC_Init() : --------
*                               NET_OS_ERR_INIT_NIC_TX_RDY          NIC transmit ready signal NOT successfully
*                                                                       initialized.
*                               NET_OS_ERR_INIT_NIC_TX_RDY_NAME     NIC transmit ready name   NOT successfully
*                                                                       configured.
*
* Return(s)   : none.
*
* Caller(s)   : Net_Init().
*
* Note(s)     : none.
*********************************************************************************************************
*/

void  NetNIC_Init (NET_ERR  *perr)
{
    NetOS_NIC_Init(perr);                        /* Create NIC OS Objects                             */
    if (*perr != NET_OS_ERR_NONE) {
        return;
    }
    NetNIC_ConnStatus           = DEF_OFF;       /* Initialize the NIC status                         */

#if (NET_CTR_CFG_STAT_EN        == DEF_ENABLED)  /* Initialize NIC statistics counters                */
    NetNIC_StatRxPktCtr         = 0;
    NetNIC_StatTxPktCtr         = 0;
#endif

#if (NET_CTR_CFG_ERR_EN         == DEF_ENABLED)  /* Initialize NIC error counters                     */
    NetNIC_ErrRxPktDiscardedCtr = 0;
    NetNIC_ErrTxPktDiscardedCtr = 0;
#endif

    MAC_Init();                                  /* Initialize the NIC hardware                       */

    NetNIC_ConnStatus           =  DEF_ON;
    *perr = NET_NIC_ERR_NONE;
}

/*$PAGE*/
/*
*********************************************************************************************************
*                                           NetNIC_IntEn()
*
* Description : Enable NIC interrupts.
*
* Argument(s) : perr        Pointer to variable that will hold the return error code from this function :
*
*                               NET_NIC_ERR_NONE                NIC interrupts successfully enabled.
*
* Return(s)   : none.
*
* Caller(s)   : Net_Init().
*
* Note(s)     : none.
*********************************************************************************************************
*/

void  NetNIC_IntEn (NET_ERR  *perr)
{
                                               /* Abort any transfers currently in progress            */
    ENET_DMA->RXSTR &=~DMA_RX_START_DMA_EN;
    ENET_DMA->TXSTR &=~DMA_TX_START_DMA_EN;
                                               /* Clear any pending interrupts                         */
    ENET_DMA->ISR = 0xFFFFFFFF;
                                               /* Enable Rx and Tx interrupts                          */
    ENET_DMA->IER = 0x80008000;
                                               /* Enable Rx and Tx on the MAC                          */
    ENET_MAC->MCR |= (MAC_MCR_TE | MAC_MCR_RE);
                                               /* Initiate Rx DMA transfer                             */
    ENET_DMA->RXSTR = DMA_RX_START_RUNT | DMA_RX_START_FFAIL | DMA_RX_START_FETCH;

    *perr = NET_NIC_ERR_NONE;
}

/*$PAGE*/
/*
*********************************************************************************************************
*                                       NetNIC_ConnStatusChk()
*
* Description : Check the NIC's network connection status.  This function always indicates that the
*               connection is up.
*
* Argument(s) : none.
*
* Return(s)   : none.
*
* Caller(s)   : ####
*********************************************************************************************************
*/

void  NetNIC_ConnStatusChk (void)
{
    NetNIC_ConnStatus = DEF_ON;
}

/*$PAGE*/
/*
*********************************************************************************************************
*                                       NetNIC_ConnStatusGet()
*
* Description : Get NIC's network connection status.
*
*               (1) Obtaining the NIC's network connection status is encapsulated in this function for the
*                   possibility that obtaining a NIC's connection status requires a non-trivial procedure.
*
*
* Argument(s) : none.
*
* Return(s)   : NIC network connection status :
*
*                   DEF_OFF         Network connection DOWN.
*                   DEF_ON          Network connection UP.
*
* Caller(s)   : NetIF_Pkt_Tx()
*
* Note(s)     : none.
*********************************************************************************************************
*/

CPU_BOOLEAN  NetNIC_ConnStatusGet (void)
{
    return (NetNIC_ConnStatus);
}

/*$PAGE*/
/*
*********************************************************************************************************
*                                        NetNIC_RxPktGetSize()
*
* Description : Get network packet size from NIC.
*
* Argument(s) : none.
*
* Return(s)   : Size, in octets, of NIC's next network packet.
*
* Caller(s)   : NetIF_RxTaskHandler().
*
* Note(s)     : none.
*********************************************************************************************************
*/

CPU_INT16U  NetNIC_RxPktGetSize (void)
{
    CPU_INT16U size;


    size = (CPU_INT16U)ENET_RxPacketGetSize();
    return (size);
}

/*$PAGE*/
/*
*********************************************************************************************************
*                                           NetNIC_RxPkt()
*
* Description : Read network packet from NIC into buffer.
*
* Argument(s) : ppkt        Pointer to memory buffer to receive NIC packet.
*               ----        Argument validated in NetIF_RxTaskHandler().
*
*               size        Number of packet frame octets to read into buffer.
*               ----        Argument checked   in NetIF_RxTaskHandler().
*
*               perr        Pointer to variable that will hold the return error code from this function :
*
*                               NET_NIC_ERR_NONE                Packet successfully read.
*                               NET_ERR_INIT_INCOMPLETE         Network initialization NOT complete.
*
* Return(s)   : none.
*
* Caller(s)   : NetIF_RxTaskHandler().
*********************************************************************************************************
*/

void  NetNIC_RxPkt (void        *ppkt,
                    CPU_INT16U   size,
                    NET_ERR     *perr)
{
#if ((NET_CTR_CFG_STAT_EN     == DEF_ENABLED)                    && \
     (CPU_CFG_CRITICAL_METHOD == CPU_CRITICAL_METHOD_STATUS_LOCAL))
    CPU_SR      cpu_sr = 0;
#endif