rt-thread/bsp/loongson/ls2kdev/drivers/net/synopGMAC_Dev.c

/*
 * Copyright (c) 2006-2018, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2017-08-24     chinesebear  first version
 * 2020-08-10     lizhirui     porting to ls2k
 */

#include "synopGMAC_Dev.h"
#include <rthw.h>
#include <rtthread.h>

#define UNUSED    1

/**
  * Function to set the MDC clock for mdio transactiona
  *
  * @param[in] pointer to device structure.
  * @param[in] clk divider value.
  * \return Reuturns 0 on success else return the error value.
  */
s32 synopGMAC_set_mdc_clk_div(synopGMACdevice *gmacdev, u32 clk_div_val)
{
    u32 orig_data;
    orig_data = synopGMACReadReg(gmacdev -> MacBase, GmacGmiiAddr); //set the mdc clock to the user defined value
    orig_data &= (~GmiiCsrClkMask);
    orig_data |= clk_div_val;
    synopGMACWriteReg(gmacdev -> MacBase, GmacGmiiAddr, orig_data);
    return 0;
}

/**
  * Returns the current MDC divider value programmed in the ip.
  *
  * @param[in] pointer to device structure.
  * @param[in] clk divider value.
  * \return Returns the MDC divider value read.
  */
u32 synopGMAC_get_mdc_clk_div(synopGMACdevice *gmacdev)
{
    u32 data;
    data = synopGMACReadReg(gmacdev->MacBase, GmacGmiiAddr);
    data &= GmiiCsrClkMask;
    return data;
}


/**
  * Function to read the Phy register. The access to phy register
  * is a slow process as the data is moved accross MDI/MDO interface
  * @param[in] pointer to Register Base (It is the mac base in our case) .
  * @param[in] PhyBase register is the index of one of supported 32 PHY devices.
  * @param[in] Register offset is the index of one of the 32 phy register.
  * @param[out] u16 data read from the respective phy register (only valid iff return value is 0).
  * \return Returns 0 on success else return the error status.
  */
s32 synopGMAC_read_phy_reg(u64 RegBase, u32 PhyBase, u32 RegOffset, u16 *data)
{
    u64 addr;
    u32 loop_variable;
    addr = ((PhyBase << GmiiDevShift) & GmiiDevMask) | ((RegOffset << GmiiRegShift) & GmiiRegMask)
           | GmiiCsrClk3;    //sw: add GmiiCsrClk
    addr = addr | GmiiBusy ; //Gmii busy bit

    synopGMACWriteReg(RegBase, GmacGmiiAddr, addr);
    //write the address from where the data to be read in GmiiGmiiAddr register of synopGMAC ip

    for (loop_variable = 0; loop_variable < DEFAULT_LOOP_VARIABLE; loop_variable++)
    {
        //Wait till the busy bit gets cleared within a certain amount of time
        if (!(synopGMACReadReg(RegBase, GmacGmiiAddr) & GmiiBusy))
        {
            break;
        }

        plat_delay(DEFAULT_DELAY_VARIABLE);
    }

    if (loop_variable < DEFAULT_LOOP_VARIABLE)
    {
        *data = (u16)(synopGMACReadReg(RegBase, GmacGmiiData) & 0xFFFF);
    }
    else
    {
        TR("Error::: PHY not responding Busy bit didnot get cleared !!!!!!\n");
        return -ESYNOPGMACPHYERR;
    }
    //sw
#if SYNOP_REG_DEBUG
    printf("read phy reg: offset = 0x%x\tdata = 0x%x\n", RegOffset, *data);
#endif

    return -ESYNOPGMACNOERR;
}

/**
  * Function to write to the Phy register. The access to phy register
  * is a slow process as the data is moved accross MDI/MDO interface
  * @param[in] pointer to Register Base (It is the mac base in our case) .
  * @param[in] PhyBase register is the index of one of supported 32 PHY devices.
  * @param[in] Register offset is the index of one of the 32 phy register.
  * @param[in] data to be written to the respective phy register.
  * \return Returns 0 on success else return the error status.
  */
s32 synopGMAC_write_phy_reg(u64 RegBase, u32 PhyBase, u32 RegOffset, u16 data)
{
    u32 addr;
    u32 loop_variable;

    synopGMACWriteReg(RegBase, GmacGmiiData, data); // write the data in to GmacGmiiData register of synopGMAC ip

    addr = ((PhyBase << GmiiDevShift) & GmiiDevMask) | ((RegOffset << GmiiRegShift) & GmiiRegMask) | GmiiWrite | GmiiCsrClk3;    //sw: add GmiiCsrclk

    addr = addr | GmiiBusy ; //set Gmii clk to 20-35 Mhz and Gmii busy bit

    synopGMACWriteReg(RegBase, GmacGmiiAddr, addr);
    for (loop_variable = 0; loop_variable < DEFAULT_LOOP_VARIABLE; loop_variable++)
    {
        if (!(synopGMACReadReg(RegBase, GmacGmiiAddr) & GmiiBusy))
        {
            break;
        }

        plat_delay(DEFAULT_DELAY_VARIABLE);
    }

    if (loop_variable < DEFAULT_LOOP_VARIABLE)
    {
        return -ESYNOPGMACNOERR;
    }
    else
    {
        TR("Error::: PHY not responding Busy bit didnot get cleared !!!!!!\n");
        return -ESYNOPGMACPHYERR;
    }
#if SYNOP_REG_DEBUG
    printf("write phy reg: offset = 0x%x\tdata = 0x%x", RegOffset, data);
#endif
}

/**
  * Function to configure the phy in loopback mode.
  *
  * @param[in] pointer to synopGMACdevice.
  * @param[in] enable or disable the loopback.
  * \return 0 on success else return the error status.
  * \note Don't get confused with mac loop-back synopGMAC_loopback_on(synopGMACdevice *)
  * and synopGMAC_loopback_off(synopGMACdevice *) functions.
  */
#if UNUSED
s32 synopGMAC_phy_loopback(synopGMACdevice *gmacdev, bool loopback)
{
    s32 status = -ESYNOPGMACNOERR;
    u16 temp;

    status = synopGMAC_read_phy_reg(gmacdev -> MacBase, gmacdev -> PhyBase, PHY_CONTROL_REG, &temp);

    if (loopback)
    {
        temp |= 0x4000;
    }
    else
    {
        temp = temp;
    }

    status = synopGMAC_write_phy_reg(gmacdev -> MacBase, gmacdev -> PhyBase, PHY_CONTROL_REG, temp);
    return status;
}

#endif

/**
  * Function to read the GMAC IP Version and populates the same in device data structure.
  * @param[in] pointer to synopGMACdevice.
  * \return Always return 0.
  */

s32 synopGMAC_read_version(synopGMACdevice *gmacdev)
{
    u32 data = 0;
    data = synopGMACReadReg(gmacdev -> MacBase, GmacVersion);
    gmacdev -> Version = data;
    return 0;
}


/**
  * Function to reset the GMAC core.
  * This reests the DMA and GMAC core. After reset all the registers holds their respective reset value
  * @param[in] pointer to synopGMACdevice.
  * \return 0 on success else return the error status.
  */
s32 synopGMAC_reset(synopGMACdevice *gmacdev)
{
    u32 data = 0;
    synopGMACWriteReg(gmacdev -> DmaBase, DmaBusMode, DmaResetOn);
    plat_delay(DEFAULT_LOOP_VARIABLE);
    data = synopGMACReadReg(gmacdev -> DmaBase, DmaBusMode);
    TR("DATA after Reset = %08x\n", data);

    return 0;
}


/**
  * Function to program DMA bus mode register.
  *
  * The Bus Mode register is programmed with the value given. The bits to be set are
  * bit wise or'ed and sent as the second argument to this function.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] the data to be programmed.
  * \return 0 on success else return the error status.
  */
s32 synopGMAC_dma_bus_mode_init(synopGMACdevice *gmacdev, u32 init_value)
{
    synopGMACWriteReg(gmacdev -> DmaBase, DmaBusMode, init_value);
    return 0;
}

/**
  * Function to program DMA Control register(Operation Mode Register 0x18).
  *
  * The Dma Control register is programmed with the value given. The bits to be set are
  * bit wise or'ed and sent as the second argument to this function.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] the data to be programmed.
  * \return 0 on success else return the error status.
  */
s32 synopGMAC_dma_control_init(synopGMACdevice *gmacdev, u32 init_value)
{
    synopGMACWriteReg(gmacdev -> DmaBase, DmaControl, init_value);
    return 0;
}


/*Gmac configuration functions*/

/**
  * Enable the watchdog timer on the receiver.
  * When enabled, Gmac enables Watchdog timer, and GMAC allows no more than
  * 2048 bytes of data (10,240 if Jumbo frame enabled).
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_wd_enable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacConfig, GmacWatchdog);
    return;
}
/**
  * Disable the watchdog timer on the receiver.
  * When disabled, Gmac disabled watchdog timer, and can receive frames up to
  * 16,384 bytes.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */

void synopGMAC_wd_disable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacConfig, GmacWatchdog);
    return;
}

/**
  * Enables the Jabber frame support.
  * When enabled, GMAC disabled the jabber timer, and can transfer 16,384 byte frames.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_jab_enable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacConfig, GmacJabber);
    return;
}
/**
  * Disables the Jabber frame support.
  * When disabled, GMAC enables jabber timer. It cuts of transmitter if application
  * sends more than 2048 bytes of data (10240 if Jumbo frame enabled).
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_jab_disable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacConfig, GmacJabber);
    return;
}
#endif

/**
  * Enables Frame bursting (Only in Half Duplex Mode).
  * When enabled, GMAC allows frame bursting in GMII Half Duplex mode.
  * Reserved in 10/100 and Full-Duplex configurations.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_frame_burst_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacConfig, GmacFrameBurst);
    return;
}
/**
  * Disables Frame bursting.
  * When Disabled, frame bursting is not supported.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_frame_burst_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacConfig, GmacFrameBurst);
    return;
}
#endif

/**
  * Enable Jumbo frame support.
  * When Enabled GMAC supports jumbo frames of 9018/9022(VLAN tagged).
  * Giant frame error is not reported in receive frame status.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_jumbo_frame_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacConfig, GmacJumboFrame);
    return;
}
#endif
/**
  * Disable Jumbo frame support.
  * When Disabled GMAC does not supports jumbo frames.
  * Giant frame error is reported in receive frame status.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_jumbo_frame_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacConfig, GmacJumboFrame);
    return;
}

/**
  * Disable Carrier sense.
  * When Disabled GMAC ignores CRS signal during frame transmission
  * in half duplex mode.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */

#if UNUSED
void synopGMAC_disable_crs(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacConfig, GmacDisableCrs);
    return;
}
#endif



/**
  * Selects the GMII port.
  * When called GMII (1000Mbps) port is selected (programmable only in 10/100/1000 Mbps configuration).
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_select_gmii(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacConfig, GmacMiiGmii);
    return;
}
/**
  * Selects the MII port.
  * When called MII (10/100Mbps) port is selected (programmable only in 10/100/1000 Mbps configuration).
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_select_mii(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacConfig, GmacMiiGmii);
    return;
}

/**
  * Enables Receive Own bit (Only in Half Duplex Mode).
  * When enaled GMAC receives all the packets given by phy while transmitting.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_rx_own_enable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacConfig, GmacRxOwn);
    return;
}
/**
  * Disables Receive Own bit (Only in Half Duplex Mode).
  * When enaled GMAC disables the reception of frames when gmii_txen_o is asserted.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_rx_own_disable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacConfig, GmacRxOwn);
    return;
}
#endif

/**
  * Sets the GMAC in loopback mode.
  * When on GMAC operates in loop-back mode at GMII/MII.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  * \note (G)MII Receive clock is required for loopback to work properly, as transmit clock is
  * not looped back internally.
  */
void synopGMAC_loopback_on(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacConfig, GmacLoopback);
    return;
}
/**
  * Sets the GMAC in Normal mode.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_loopback_off(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacConfig, GmacLoopback);
    return;
}

/**
  * Sets the GMAC core in Full-Duplex mode.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_set_full_duplex(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacConfig, GmacDuplex);
    return;
}
/**
  * Sets the GMAC core in Half-Duplex mode.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_set_half_duplex(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacConfig, GmacDuplex);
    return;
}

/**
  * GMAC tries retransmission (Only in Half Duplex mode).
  * If collision occurs on the GMII/MII, GMAC attempt retries based on the
  * back off limit configured.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  * \note This function is tightly coupled with synopGMAC_back_off_limit(synopGMACdev *, u32).
  */
void synopGMAC_retry_enable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacConfig, GmacRetry);
    return;
}
/**
  * GMAC tries only one transmission (Only in Half Duplex mode).
  * If collision occurs on the GMII/MII, GMAC will ignore the current frami
  * transmission and report a frame abort with excessive collision in tranmit frame status.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_retry_disable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacConfig, GmacRetry);
    return;
}
#endif

/**
  * GMAC strips the Pad/FCS field of incoming frames.
  * This is true only if the length field value is less than or equal to
  * 1500 bytes. All received frames with length field greater than or equal to
  * 1501 bytes are passed to the application without stripping the Pad/FCS field.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_pad_crc_strip_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacConfig, GmacPadCrcStrip);
    return;
}
#endif
/**
  * GMAC doesnot strips the Pad/FCS field of incoming frames.
  * GMAC will pass all the incoming frames to Host unmodified.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_pad_crc_strip_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacConfig, GmacPadCrcStrip);
    u32 status = synopGMACReadReg(gmacdev -> MacBase, GmacConfig);
    DEBUG_MES("strips status : %u\n", status & GmacPadCrcStrip);
    return;
}
/**
  * GMAC programmed with the back off limit value.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  * \note This function is tightly coupled with synopGMAC_retry_enable(synopGMACdevice * gmacdev)
  */
void synopGMAC_back_off_limit(synopGMACdevice *gmacdev, u32 value)
{
    u32 data;
    data = synopGMACReadReg(gmacdev -> MacBase, GmacConfig);
    data &= (~GmacBackoffLimit);
    data |= value;
    synopGMACWriteReg(gmacdev -> MacBase, GmacConfig, data);
    return;
}

/**
  * Enables the Deferral check in GMAC (Only in Half Duplex mode)
  * GMAC issues a Frame Abort Status, along with the excessive deferral error bit set in the
  * transmit frame status when transmit state machine is deferred for more than
  *     - 24,288 bit times in 10/100Mbps mode
  *     - 155,680 bit times in 1000Mbps mode or Jumbo frame mode in 10/100Mbps operation.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  * \note Deferral begins when transmitter is ready to transmit, but is prevented because  of
  * an active CRS (carrier sense)
  */
#if UNUSED
void synopGMAC_deferral_check_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacConfig, GmacDeferralCheck);
    return;
}
#endif
/**
  * Disables the Deferral check in GMAC (Only in Half Duplex mode).
  * GMAC defers until the CRS signal goes inactive.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_deferral_check_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacConfig, GmacDeferralCheck);
    return;
}
/**
  * Enable the reception of frames on GMII/MII.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_rx_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacConfig, GmacRx);
    return;
}
/**
  * Disable the reception of frames on GMII/MII.
  * GMAC receive state machine is disabled after completion of reception of current frame.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_rx_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacConfig, GmacRx);
    return;
}
#endif
/**
  * Enable the transmission of frames on GMII/MII.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_tx_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacConfig, GmacTx);
    return;
}
/**
  * Disable the transmission of frames on GMII/MII.
  * GMAC transmit state machine is disabled after completion of transmission of current frame.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_tx_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacConfig, GmacTx);
    return;
}
#endif


/*Receive frame filter configuration functions*/

/**
  * Disables reception of all the frames to application.
  * GMAC passes only those received frames to application which
  * pass SA/DA address filtering.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
void synopGMAC_frame_filter_enable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacFrameFilter, GmacFilter);
    return;
}

/**
 * Enables reception of all the frames to application.
 * GMAC passes all the frames received to application irrespective of whether they
 * pass SA/DA address filtering or not.
 * @param[in] pointer to synopGMACdevice.
 * \return returns void.
 */
void synopGMAC_frame_filter_disable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacFrameFilter, GmacFilter);
    return;
}

/**
  * Populates the Hash High register with the data supplied.
  * This function is called when the Hash filtering is to be enabled.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] data to be written to hash table high register.
  * \return void.
  */
#if UNUSED
void synopGMAC_write_hash_table_high(synopGMACdevice *gmacdev, u32 data)
{
    synopGMACWriteReg(gmacdev -> MacBase, GmacHashHigh, data);
    return;
}
#endif

/**
  * Populates the Hash Low register with the data supplied.
  * This function is called when the Hash filtering is to be enabled.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] data to be written to hash table low register.
  * \return void.
  */
#if UNUSED
void synopGMAC_write_hash_table_low(synopGMACdevice *gmacdev, u32 data)
{
    synopGMACWriteReg(gmacdev -> MacBase, GmacHashLow, data);
    return;
}
#endif

/**
  * Enables Hash or Perfect filter (only if Hash filter is enabled in H/W).
  * Only frames matching either perfect filtering or Hash Filtering as per HMC and HUC
  * configuration are sent to application.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
#if UNUSED
void synopGMAC_hash_perfect_filter_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacFrameFilter, GmacHashPerfectFilter);
    return;
}
#endif

/**
  * Enables only Hash(only if Hash filter is enabled in H/W).
  * Only frames matching Hash Filtering as per HMC and HUC
  * configuration are sent to application.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
#if UNUSED
void synopGMAC_Hash_filter_only_enable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacFrameFilter, GmacHashPerfectFilter);
    return;
}
#endif

/**
  * Enables Source address filtering.
  * When enabled source address filtering is performed. Only frames matching SA filtering are passed  to application with
  * SAMatch bit of RxStatus is set. GMAC drops failed frames.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  * \note This function is overriden by synopGMAC_frame_filter_disable(synopGMACdevice *)
  */
#if UNUSED
void synopGMAC_src_addr_filter_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacFrameFilter, GmacSrcAddrFilter);
    return;
}
#endif
/**
  * Disables Source address filtering.
  * When disabled GMAC forwards the received frames with updated SAMatch bit in RxStatus.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
void synopGMAC_src_addr_filter_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacFrameFilter, GmacSrcAddrFilter);
    return;
}
/**
  * Enables Inverse Destination address filtering.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
#if UNUSED
void synopGMAC_dst_addr_filter_inverse(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacFrameFilter, GmacDestAddrFilterInv);
    return;
}
#endif
/**
  * Enables the normal Destination address filtering.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
void synopGMAC_dst_addr_filter_normal(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacFrameFilter, GmacDestAddrFilterInv);
    return;
}

/**
  * Enables forwarding of control frames.
  * When set forwards all the control frames (incl. unicast and multicast PAUSE frames).
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  * \note Depends on RFE of FlowControlRegister[2]
  */
void synopGMAC_set_pass_control(synopGMACdevice *gmacdev, u32 passcontrol)
{
    u32 data;
    data = synopGMACReadReg(gmacdev -> MacBase, GmacFrameFilter);
    data &= (~GmacPassControl);
    data |= passcontrol;
    synopGMACWriteReg(gmacdev -> MacBase, GmacFrameFilter, data);
    return;
}

/**
  * Enables Broadcast frames.
  * When enabled Address filtering module passes all incoming broadcast frames.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
void synopGMAC_broadcast_enable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacFrameFilter, GmacBroadcast);
    return;
}
/**
  * Disable Broadcast frames.
  * When disabled Address filtering module filters all incoming broadcast frames.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
#if UNUSED
void synopGMAC_broadcast_disable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacFrameFilter, GmacBroadcast);
    return;
}
#endif

/**
  * Enables Multicast frames.
  * When enabled all multicast frames are passed.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
#if UNUSED
void synopGMAC_multicast_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacFrameFilter, GmacMulticastFilter);
    return;
}
#endif
/**
  * Disable Multicast frames.
  * When disabled multicast frame filtering depends on HMC bit.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
void synopGMAC_multicast_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacFrameFilter, GmacMulticastFilter);
    return;
}

/**
  * Enables multicast hash filtering.
  * When enabled GMAC performs teh destination address filtering according to the hash table.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
#if UNUSED
void synopGMAC_multicast_hash_filter_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacFrameFilter, GmacMcastHashFilter);
    return;
}
#endif
/**
  * Disables multicast hash filtering.
  * When disabled GMAC performs perfect destination address filtering for multicast frames, it compares
  * DA field with the value programmed in DA register.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
void synopGMAC_multicast_hash_filter_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacFrameFilter, GmacMcastHashFilter);
    return;
}

/**
  * Enables promiscous mode.
  * When enabled Address filter modules pass all incoming frames regardless of their Destination
  * and source addresses.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
#if UNUSED
void synopGMAC_promisc_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacFrameFilter, GmacPromiscuousMode);
    return;
}
#endif
/**
  * Clears promiscous mode.
  * When called the GMAC falls back to normal operation from promiscous mode.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
void synopGMAC_promisc_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacFrameFilter, GmacPromiscuousMode);
    return;
}

/**
  * Enables unicast hash filtering.
  * When enabled GMAC performs the destination address filtering of unicast frames according to the hash table.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
#if UNUSED
void synopGMAC_unicast_hash_filter_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacFrameFilter, GmacUcastHashFilter);
    return;
}
#endif
/**
  * Disables multicast hash filtering.
  * When disabled GMAC performs perfect destination address filtering for unicast frames, it compares
  * DA field with the value programmed in DA register.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
void synopGMAC_unicast_hash_filter_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacFrameFilter, GmacUcastHashFilter);
    return;
}

/*Flow control configuration functions*/

/**
  * Enables detection of pause frames with stations unicast address.
  * When enabled GMAC detects the pause frames with stations unicast address in addition to the
  * detection of pause frames with unique multicast address.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
#if UNUSED
void synopGMAC_unicast_pause_frame_detect_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacFlowControl, GmacUnicastPauseFrame);
    return;
}
#endif
/**
  * Disables detection of pause frames with stations unicast address.
  * When disabled GMAC only detects with the unique multicast address (802.3x).
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
void synopGMAC_unicast_pause_frame_detect_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacFlowControl, GmacUnicastPauseFrame);
    return;
}
/**
  * Rx flow control enable.
  * When Enabled GMAC will decode the rx pause frame and disable the tx for a specified time.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
void synopGMAC_rx_flow_control_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacFlowControl, GmacRxFlowControl);
    return;
}
/**
  * Rx flow control disable.
  * When disabled GMAC will not decode pause frame.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
void synopGMAC_rx_flow_control_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacFlowControl, GmacRxFlowControl);
    return;
}
/**
  * Tx flow control enable.
  * When Enabled
  *     - In full duplex GMAC enables flow control operation to transmit pause frames.
  *    - In Half duplex GMAC enables the back pressure operation
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
void synopGMAC_tx_flow_control_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev -> MacBase, GmacFlowControl, GmacTxFlowControl);
    return;
}

/**
  * Tx flow control disable.
  * When Disabled
  *     - In full duplex GMAC will not transmit any pause frames.
  *    - In Half duplex GMAC disables the back pressure feature.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
void synopGMAC_tx_flow_control_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev -> MacBase, GmacFlowControl, GmacTxFlowControl);
    return;
}

/**
  * Initiate Flowcontrol operation.
  * When Set
  *     - In full duplex GMAC initiates pause control frame.
  *    - In Half duplex GMAC initiates back pressure function.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
#if UNUSED
void synopGMAC_tx_activate_flow_control(synopGMACdevice *gmacdev)
{
    //In case of full duplex check for this bit to b'0. if it is read as b'1 indicates that
    //control frame transmission is in progress.
    if (gmacdev -> Speed == FULLDUPLEX)
    {
        if (!synopGMACCheckBits(gmacdev -> MacBase, GmacFlowControl, GmacFlowControlBackPressure))
        {
            synopGMACSetBits(gmacdev -> MacBase, GmacFlowControl, GmacFlowControlBackPressure);
        }
    }
    else//if half duplex mode
    {

        synopGMACSetBits(gmacdev -> MacBase, GmacFlowControl, GmacFlowControlBackPressure);
    }

    return;
}
#endif

/**
  * stops Flowcontrol operation.
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
#if UNUSED
void synopGMAC_tx_deactivate_flow_control(synopGMACdevice *gmacdev)
{
    //In full duplex this bit is automatically cleared after transmitting a pause control frame.
    if (gmacdev->Speed == HALFDUPLEX)
    {
        synopGMACSetBits(gmacdev -> MacBase, GmacFlowControl, GmacFlowControlBackPressure);
    }

    return;
}
#endif

/**
  * This enables the pause frame generation after programming the appropriate registers.
  * presently activation is set at 3k and deactivation set at 4k. These may have to tweaked
  * if found any issues
  * @param[in] pointer to synopGMACdevice.
  * \return void.
  */
void synopGMAC_pause_control(synopGMACdevice *gmacdev)
{
    u32 omr_reg;
    u32 mac_flow_control_reg;
    omr_reg = synopGMACReadReg(gmacdev -> DmaBase, DmaControl);
    omr_reg |= DmaRxFlowCtrlAct4K | DmaRxFlowCtrlDeact5K | DmaEnHwFlowCtrl;
    synopGMACWriteReg(gmacdev -> DmaBase, DmaControl, omr_reg);

    mac_flow_control_reg = synopGMACReadReg(gmacdev -> MacBase, GmacFlowControl);
    mac_flow_control_reg |= GmacRxFlowControl | GmacTxFlowControl | 0xFFFF0000;
    synopGMACWriteReg(gmacdev -> MacBase, GmacFlowControl, mac_flow_control_reg);

    return;
}

/**
  * Example mac initialization sequence.
  * This function calls the initialization routines to initialize the GMAC register.
  * One can change the functions invoked here to have different configuration as per the requirement
  * @param[in] pointer to synopGMACdevice.
  * \return Returns 0 on success.
  */
s32 synopGMAC_mac_init(synopGMACdevice *gmacdev)
{
    u32 PHYreg;

    if (gmacdev->DuplexMode == FULLDUPLEX)
    {
        TR("\n===phy FULLDUPLEX MODE\n");    //sw:    debug
        synopGMAC_wd_enable(gmacdev);
        synopGMAC_jab_enable(gmacdev);
        synopGMAC_frame_burst_enable(gmacdev);
        synopGMAC_jumbo_frame_disable(gmacdev);
        synopGMAC_rx_own_enable(gmacdev);
#if SYNOP_LOOPBACK_MODE
        synopGMAC_loopback_on(gmacdev);
#else
        synopGMAC_loopback_off(gmacdev);
#endif
        synopGMAC_set_full_duplex(gmacdev);  //1
        synopGMAC_retry_enable(gmacdev);
        synopGMAC_pad_crc_strip_disable(gmacdev);
        synopGMAC_back_off_limit(gmacdev, GmacBackoffLimit0);
        synopGMAC_deferral_check_disable(gmacdev);

        synopGMAC_tx_enable(gmacdev);    //according to Tang Dan's commitment
        synopGMAC_rx_enable(gmacdev);

        synopGMACSetBits(gmacdev -> DmaBase, DmaControl, DmaStoreAndForward); //3
        synopGMACSetBits(gmacdev -> DmaBase, DmaControl, DmaFwdErrorFrames);

        if (gmacdev -> Speed == SPEED1000)
        {
            synopGMAC_select_gmii(gmacdev);
        }
        else
        {
            synopGMAC_select_mii(gmacdev);

            if (gmacdev -> Speed == SPEED100)
            {
                synopGMACSetBits(gmacdev -> MacBase, GmacConfig, GmacFESpeed100);
            }
            else
            {
                synopGMACSetBits(gmacdev -> MacBase, GmacConfig, GmacFESpeed10);
            }
        }


        /*Frame Filter Configuration*/
        //synopGMAC_frame_filter_enable(gmacdev); //2
        synopGMAC_frame_filter_disable(gmacdev); //2
        synopGMAC_set_pass_control(gmacdev, GmacPassControl0);
        synopGMAC_broadcast_enable(gmacdev);
        synopGMAC_src_addr_filter_disable(gmacdev);
        synopGMAC_multicast_disable(gmacdev);
        synopGMAC_dst_addr_filter_normal(gmacdev);    //scl
        //synopGMAC_dst_addr_filter_inverse(gmacdev);
        synopGMAC_multicast_hash_filter_disable(gmacdev);
        synopGMAC_promisc_disable(gmacdev);
        synopGMAC_unicast_hash_filter_disable(gmacdev);

        /*Flow Control Configuration*/
        synopGMAC_unicast_pause_frame_detect_disable(gmacdev);
        synopGMAC_rx_flow_control_enable(gmacdev);
        synopGMAC_tx_flow_control_enable(gmacdev);
    }
    else//for Half Duplex configuration
    {

        TR("\n===phy HALFDUPLEX MODE\n");    //sw:    debug
        synopGMAC_wd_enable(gmacdev);
        synopGMAC_jab_enable(gmacdev);
        synopGMAC_frame_burst_enable(gmacdev);
        synopGMAC_jumbo_frame_disable(gmacdev);
        synopGMAC_rx_own_enable(gmacdev);
#if SYNOP_LOOPBACK_MODE
        synopGMAC_loopback_on(gmacdev);
#else
        synopGMAC_loopback_off(gmacdev);
#endif
        synopGMAC_set_half_duplex(gmacdev);
        synopGMAC_retry_enable(gmacdev);
        synopGMAC_pad_crc_strip_disable(gmacdev);
        synopGMAC_back_off_limit(gmacdev, GmacBackoffLimit0);
        synopGMAC_deferral_check_disable(gmacdev);

//sw: set efe & tsf
        synopGMACSetBits(gmacdev -> DmaBase, DmaControl, DmaStoreAndForward);
        synopGMACSetBits(gmacdev -> DmaBase, DmaControl, DmaFwdErrorFrames);
//sw: put it in the end
        synopGMAC_tx_enable(gmacdev);
        synopGMAC_rx_enable(gmacdev);


        if (gmacdev -> Speed == SPEED1000)
            synopGMAC_select_gmii(gmacdev);
        else
        {
            synopGMAC_select_mii(gmacdev);

            if (gmacdev -> Speed == SPEED100)
            {
                synopGMACSetBits(gmacdev -> MacBase, GmacConfig, GmacFESpeed100);
            }
            else
            {
                synopGMACSetBits(gmacdev -> MacBase, GmacConfig, GmacFESpeed10);
            }
        }

//        synopGMACSetBits(gmacdev->MacBase, GmacConfig, GmacDisableCrs);
//        synopGMAC_select_gmii(gmacdev);

        /*Frame Filter Configuration*/
        synopGMAC_frame_filter_enable(gmacdev);
//         synopGMAC_frame_filter_disable(gmacdev);

        synopGMAC_set_pass_control(gmacdev, GmacPassControl0);
        synopGMAC_broadcast_enable(gmacdev);
        synopGMAC_src_addr_filter_disable(gmacdev);
        synopGMAC_multicast_disable(gmacdev);
        synopGMAC_dst_addr_filter_normal(gmacdev);
        synopGMAC_multicast_hash_filter_disable(gmacdev);

        synopGMAC_promisc_disable(gmacdev);
//        synopGMAC_promisc_enable(gmacdev);
        synopGMAC_unicast_hash_filter_disable(gmacdev);

//sw: loopback mode
//        synopGMAC_loopback_on(gmacdev);

        /*Flow Control Configuration*/
        synopGMAC_unicast_pause_frame_detect_disable(gmacdev);
        synopGMAC_rx_flow_control_disable(gmacdev);
        synopGMAC_tx_flow_control_disable(gmacdev);

        /*To set PHY register to enable CRS on Transmit*/
    }
    return 0;
}


/**
  * Sets the Mac address in to GMAC register.
  * This function sets the MAC address to the MAC register in question.
  * @param[in] pointer to synopGMACdevice to populate mac dma and phy addresses.
  * @param[in] Register offset for Mac address high
  * @param[in] Register offset for Mac address low
  * @param[in] buffer containing mac address to be programmed.
  * \return 0 upon success. Error code upon failure.
  */
s32 synopGMAC_set_mac_addr(synopGMACdevice *gmacdev, u32 MacHigh, u32 MacLow, u8 *MacAddr)
{
    u32 data;

    data = (MacAddr[5] << 8) | MacAddr[4];
    synopGMACWriteReg(gmacdev -> MacBase, MacHigh, data);
    data = (MacAddr[3] << 24) | (MacAddr[2] << 16) | (MacAddr[1] << 8) | MacAddr[0];
    synopGMACWriteReg(gmacdev -> MacBase, MacLow, data);

    return 0;
}


/**
  * Get the Mac address in to the address specified.
  * The mac register contents are read and written to buffer passed.
  * @param[in] pointer to synopGMACdevice to populate mac dma and phy addresses.
  * @param[in] Register offset for Mac address high
  * @param[in] Register offset for Mac address low
  * @param[out] buffer containing the device mac address.
  * \return 0 upon success. Error code upon failure.
  */
s32 synopGMAC_get_mac_addr(synopGMACdevice *gmacdev, u32 MacHigh, u32 MacLow, u8 *MacAddr)
{
    u32 data;

    data = synopGMACReadReg(gmacdev -> MacBase, MacHigh);
    MacAddr[5] = (data >> 8) & 0xff;
    MacAddr[4] = (data)        & 0xff;

    data = synopGMACReadReg(gmacdev -> MacBase, MacLow);
    MacAddr[3] = (data >> 24) & 0xff;
    MacAddr[2] = (data >> 16) & 0xff;
    MacAddr[1] = (data >> 8) & 0xff;
    MacAddr[0] = (data)      & 0xff;

//    rt_kprintf("MacAddr = 0x%x\t0x%x\t0x%x\t0x%x\t0x%x\t0x%x\n",MacAddr[0],MacAddr[1],MacAddr[2],MacAddr[3],MacAddr[4],MacAddr[5]);

    return 0;
}


/**
  * Attaches the synopGMAC device structure to the hardware.
  * Device structure is populated with MAC/DMA and PHY base addresses.
  * @param[in] pointer to synopGMACdevice to populate mac dma and phy addresses.
  * @param[in] GMAC IP mac base address.
  * @param[in] GMAC IP dma base address.
  * @param[in] GMAC IP phy base address.
  * \return 0 upon success. Error code upon failure.
  * \note This is important function. No kernel api provided by Synopsys
  */

s32 synopGMAC_attach(synopGMACdevice *gmacdev, u64 macBase, u64 dmaBase, u64 phyBase, u8 *mac_addr)
{
    /*Make sure the Device data strucure is cleared before we proceed further*/
    rt_memset((void *)gmacdev, 0, sizeof(synopGMACdevice));
    /*Populate the mac and dma base addresses*/
    gmacdev -> MacBase = macBase;
    gmacdev -> DmaBase = dmaBase;
    gmacdev -> PhyBase = phyBase;
//    rt_kprintf("gmacdev->DmaBase = 0x%x\n", gmacdev->DmaBase);
//    rt_kprintf("dmaBase = 0x%x\n", dmaBase);
    {
        int i, j;
        u16 data;

        for (i = phyBase, j = 0; j < 32; i = (i + 1) & 0x1f, j++)
        {
            synopGMAC_read_phy_reg(gmacdev -> MacBase, i, 2, &data);

            if (data != 0 && data != 0xffff)
            {
                break;
            }

            synopGMAC_read_phy_reg(gmacdev -> MacBase, i, 3, &data);

            if (data != 0 && data != 0xffff)
            {
                break;
            }
        }

        if (j == 32)
        {
            rt_kprintf("phy_detect: can't find PHY!\n");
        }

        gmacdev -> PhyBase = i;
    }

//    synopGMAC_get_mac_addr(gmacdev, GmacAddr0High, GmacAddr0Low, mac_addr);

    /* Program/flash in the station/IP's Mac address */
    synopGMAC_set_mac_addr(gmacdev, GmacAddr0High, GmacAddr0Low, mac_addr);

    return 0;
}




/**
  * Initialize the rx descriptors for ring or chain mode operation.
  *     - Status field is initialized to 0.
  *    - EndOfRing set for the last descriptor.
  *    - buffer1 and buffer2 set to 0 for ring mode of operation. (note)
  *    - data1 and data2 set to 0. (note)
  * @param[in] pointer to DmaDesc structure.
  * @param[in] whether end of ring
  * \return void.
  * \note Initialization of the buffer1, buffer2, data1,data2 and status are not done here. This only initializes whether one wants to use this descriptor
  * in chain mode or ring mode. For chain mode of operation the buffer2 and data2 are programmed before calling this function.
  */
void synopGMAC_rx_desc_init_ring(DmaDesc *desc, bool last_ring_desc)
{
    desc -> length = last_ring_desc ? RxDescEndOfRing : 0;
    desc -> status = 0;
    desc -> buffer1 = 0;
    desc -> buffer2 = 0;
    desc -> data1 = 0;
    desc -> data2 = 0;
    //desc -> dummy1 = 0;
    //desc -> dummy2 = 0;

    return;
}
void synopGMAC_rx_desc_recycle(DmaDesc *desc, bool last_ring_desc)
{
    desc -> status = DescOwnByDma;
    desc -> length = last_ring_desc ? RxDescEndOfRing : 0;
    //desc->buffer1 = 0;
    //desc->buffer2 = 0;
    //desc->data1 = 0;
    //desc->data2 = 0;
    //desc -> dummy1 = 0;
    //desc -> dummy2 = 0;

    return;
}
/**
  * Initialize the tx descriptors for ring or chain mode operation.
  *     - Status field is initialized to 0.
  *    - EndOfRing set for the last descriptor.
  *    - buffer1 and buffer2 set to 0 for ring mode of operation. (note)
  *    - data1 and data2 set to 0. (note)
  * @param[in] pointer to DmaDesc structure.
  * @param[in] whether end of ring
  * \return void.
  * \note Initialization of the buffer1, buffer2, data1,data2 and status are not done here. This only initializes whether one wants to use this descriptor
  * in chain mode or ring mode. For chain mode of operation the buffer2 and data2 are programmed before calling this function.
  */
void synopGMAC_tx_desc_init_ring(DmaDesc *desc, bool last_ring_desc)
{
#ifdef ENH_DESC
    desc -> status = last_ring_desc ? TxDescEndOfRing : 0;
    desc -> length = 0;
#else
    desc -> length = last_ring_desc ? TxDescEndOfRing : 0;
    desc -> status = 0;
#endif
//sw
    desc -> buffer1 = 0;
    desc -> buffer2 = 0;
    desc -> data1 = 0;
    desc -> data2 = 0;
    //desc -> dummy1 = 0;
    //desc -> dummy2 = 0;
    return;
}

/**
  * Initialize the rx descriptors for chain mode of operation.
  *     - Status field is initialized to 0.
  *    - EndOfRing set for the last descriptor.
  *    - buffer1 and buffer2 set to 0.
  *    - data1 and data2 set to 0.
  * @param[in] pointer to DmaDesc structure.
  * @param[in] whether end of ring
  * \return void.
  */

void synopGMAC_rx_desc_init_chain(DmaDesc *desc)
{
    desc -> status = 0;
    desc -> length = RxDescChain;
    desc -> buffer1 = 0;
    desc -> data1 = 0;
    return;
}
/**
  * Initialize the rx descriptors for chain mode of operation.
  *     - Status field is initialized to 0.
  *    - EndOfRing set for the last descriptor.
  *    - buffer1 and buffer2 set to 0.
  *    - data1 and data2 set to 0.
  * @param[in] pointer to DmaDesc structure.
  * @param[in] whether end of ring
  * \return void.
  */
void synopGMAC_tx_desc_init_chain(DmaDesc *desc)
{
#ifdef ENH_DESC
    desc -> status = TxDescChain;
    desc -> length = 0;
#else
    desc -> length = TxDescChain;
#endif
    desc -> buffer1 = 0;
    desc -> data1 = 0;
    return;
}

s32 synopGMAC_init_tx_rx_desc_queue(synopGMACdevice *gmacdev)
{
    s32 i;

    for (i = 0; i < gmacdev -> TxDescCount; i++)
    {
        synopGMAC_tx_desc_init_ring(gmacdev -> TxDesc + i, i == gmacdev -> TxDescCount - 1);
    }

    TR("At line %d\n", __LINE__);

    for (i = 0; i < gmacdev -> RxDescCount; i++)
    {
        synopGMAC_rx_desc_init_ring(gmacdev -> RxDesc + i, i == gmacdev -> RxDescCount - 1);
    }

    gmacdev -> TxNext = 0;
    gmacdev -> TxBusy = 0;
    gmacdev -> RxNext = 0;
    gmacdev -> RxBusy = 0;

    return -ESYNOPGMACNOERR;
}
/**
  * Programs the DmaRxBaseAddress with the Rx descriptor base address.
  * Rx Descriptor's base address is available in the gmacdev structure. This function progrms the
  * Dma Rx Base address with the starting address of the descriptor ring or chain.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_init_rx_desc_base(synopGMACdevice *gmacdev)
{
    DEBUG_MES("gmacdev->RxDescDma = %08x\n", gmacdev -> RxDescDma);
    synopGMACWriteReg(gmacdev -> DmaBase, DmaRxBaseAddr, (u32)gmacdev -> RxDescDma);
    return;
}

/**
  * Programs the DmaTxBaseAddress with the Tx descriptor base address.
  * Tx Descriptor's base address is available in the gmacdev structure. This function progrms the
  * Dma Tx Base address with the starting address of the descriptor ring or chain.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_init_tx_desc_base(synopGMACdevice *gmacdev)
{
    synopGMACWriteReg(gmacdev -> DmaBase, DmaTxBaseAddr, (u32)gmacdev -> TxDescDma);
    return;
}


/**
  * Makes the Dma as owner for this descriptor.
  * This function sets the own bit of status field of the DMA descriptor,
  * indicating the DMA is the owner for this descriptor.
  * @param[in] pointer to DmaDesc structure.
  * \return returns void.
  */
void synopGMAC_set_owner_dma(DmaDesc *desc)
{
    desc -> status |= DescOwnByDma;
}

/**
  * set tx descriptor to indicate SOF.
  * This Descriptor contains the start of ethernet frame.
  * @param[in] pointer to DmaDesc structure.
  * \return returns void.
  */
void synopGMAC_set_desc_sof(DmaDesc *desc)
{
#ifdef ENH_DESC
    desc -> status |= DescTxFirst;//ENH_DESC
#else
    desc -> length |= DescTxFirst;
#endif
}

/**
  * set tx descriptor to indicate EOF.
  * This descriptor contains the End of ethernet frame.
  * @param[in] pointer to DmaDesc structure.
  * \return returns void.
  */
void synopGMAC_set_desc_eof(DmaDesc *desc)
{
#ifdef ENH_DESC
    desc -> status |= DescTxLast;//ENH_DESC
#else
    desc -> length |= DescTxLast;
#endif
}


/**
  * checks whether this descriptor contains start of frame.
  * This function is to check whether the descriptor's data buffer
  * contains a fresh ethernet frame?
  * @param[in] pointer to DmaDesc structure.
  * \return returns true if SOF in current descriptor, else returns fail.
  */
bool synopGMAC_is_sof_in_rx_desc(DmaDesc *desc)
{
    return ((desc -> status & DescRxFirst) == DescRxFirst);
}

/**
  * checks whether this descriptor contains end of frame.
  * This function is to check whether the descriptor's data buffer
  * contains end of ethernet frame?
  * @param[in] pointer to DmaDesc structure.
  * \return returns true if SOF in current descriptor, else returns fail.
  */
bool synopGMAC_is_eof_in_rx_desc(DmaDesc *desc)
{
    return ((desc -> status & DescRxLast) == DescRxLast);
}

/**
  * checks whether destination address filter failed in the rx frame.
  * @param[in] pointer to DmaDesc structure.
  * \return returns true if Failed, false if not.
  */
bool synopGMAC_is_da_filter_failed(DmaDesc *desc)
{
    return ((desc -> status & DescDAFilterFail) == DescDAFilterFail);
}

/**
  * checks whether source address filter failed in the rx frame.
  * @param[in] pointer to DmaDesc structure.
  * \return returns true if Failed, false if not.
  */
bool synopGMAC_is_sa_filter_failed(DmaDesc *desc)
{
    return ((desc -> status & DescSAFilterFail) == DescSAFilterFail);
}

/**
  * Checks whether the descriptor is owned by DMA.
  * If descriptor is owned by DMA then the OWN bit is set to 1. This API is same for both ring and chain mode.
  * @param[in] pointer to DmaDesc structure.
  * \return returns true if Dma owns descriptor and false if not.
  */
bool synopGMAC_is_desc_owned_by_dma(DmaDesc *desc)
{
    return ((desc -> status & DescOwnByDma) == DescOwnByDma);
}

/**
  * returns the byte length of received frame including CRC.
  * This returns the no of bytes received in the received ethernet frame including CRC(FCS).
  * @param[in] pointer to DmaDesc structure.
  * \return returns the length of received frame lengths in bytes.
  */
u32 synopGMAC_get_rx_desc_frame_length(u32 status)
{
    return ((status & DescFrameLengthMask) >> DescFrameLengthShift);
}

/**
  * Checks whether the descriptor is valid
  * if no errors such as CRC/Receive Error/Watchdog Timeout/Late collision/Giant Frame/Overflow/Descriptor
  * error the descritpor is said to be a valid descriptor.
  * @param[in] pointer to DmaDesc structure.
  * \return True if desc valid. false if error.
  */
bool synopGMAC_is_desc_valid(u32 status)
{
    return ((status & DescError) == 0);
}

/**
  * Checks whether the descriptor is empty.
  * If the buffer1 and buffer2 lengths are zero in ring mode descriptor is empty.
  * In chain mode buffer2 length is 0 but buffer2 itself contains the next descriptor address.
  * @param[in] pointer to DmaDesc structure.
  * \return returns true if descriptor is empty, false if not empty.
  */
bool synopGMAC_is_desc_empty(DmaDesc *desc)
{
    //if both the buffer1 length and buffer2 length are zero desc is empty
    return (((desc -> length & DescSize1Mask) == 0) && ((desc -> length & DescSize2Mask) == 0));
}


/**
  * Checks whether the rx descriptor is valid.
  * if rx descripor is not in error and complete frame is available in the same descriptor
  * @param[in] pointer to DmaDesc structure.
  * \return returns true if no error and first and last desc bits are set, otherwise it returns false.
  */
bool synopGMAC_is_rx_desc_valid(u32 status)
{
    return ((status & DescError) == 0) && ((status & DescRxFirst) == DescRxFirst) && ((status & DescRxLast) == DescRxLast);
}

/**
  * Checks whether the tx is aborted due to collisions.
  * @param[in] pointer to DmaDesc structure.
  * \return returns true if collisions, else returns false.
  */
bool synopGMAC_is_tx_aborted(u32 status)
{
    return (((status & DescTxLateCollision) == DescTxLateCollision) | ((status & DescTxExcCollisions) == DescTxExcCollisions));

}

/**
  * Checks whether the tx carrier error.
  * @param[in] pointer to DmaDesc structure.
  * \return returns true if carrier error occured, else returns falser.
  */
bool synopGMAC_is_tx_carrier_error(u32 status)
{
    return (((status & DescTxLostCarrier) == DescTxLostCarrier) | ((status & DescTxNoCarrier) == DescTxNoCarrier));
}


/**
  * Gives the transmission collision count.
  * returns the transmission collision count indicating number of collisions occured before the frame was transmitted.
  * Make sure to check excessive collision didnot happen to ensure the count is valid.
  * @param[in] pointer to DmaDesc structure.
  * \return returns the count value of collision.
  */
u32 synopGMAC_get_tx_collision_count(u32 status)
{
    return ((status & DescTxCollMask) >> DescTxCollShift);
}
u32 synopGMAC_is_exc_tx_collisions(u32 status)
{
    return ((status & DescTxExcCollisions) == DescTxExcCollisions);
}


/**
  * Check for damaged frame due to overflow or collision.
  * Retruns true if rx frame was damaged due to buffer overflow in MTL or late collision in half duplex mode.
  * @param[in] pointer to DmaDesc structure.
  * \return returns true if error else returns false.
  */
bool synopGMAC_is_rx_frame_damaged(u32 status)
{
//bool synopGMAC_dma_rx_collisions(u32 status)
    return (((status & DescRxDamaged) == DescRxDamaged) | ((status & DescRxCollision) == DescRxCollision));
}

/**
  * Check for damaged frame due to collision.
  * Retruns true if rx frame was damaged due to late collision in half duplex mode.
  * @param[in] pointer to DmaDesc structure.
  * \return returns true if error else returns false.
  */
bool synopGMAC_is_rx_frame_collision(u32 status)
{
//bool synopGMAC_dma_rx_collisions(u32 status)
    return ((status & DescRxCollision) == DescRxCollision);
}

/**
  * Check for receive CRC error.
  * Retruns true if rx frame CRC error occured.
  * @param[in] pointer to DmaDesc structure.
  * \return returns true if error else returns false.
  */
bool synopGMAC_is_rx_crc(u32 status)
{
//u32 synopGMAC_dma_rx_crc(u32 status)
    return ((status & DescRxCrc) == DescRxCrc);
}

/**
  * Indicates rx frame has non integer multiple of bytes. (odd nibbles).
  * Retruns true if dribbling error in rx frame.
  * @param[in] pointer to DmaDesc structure.
  * \return returns true if error else returns false.
  */
bool synopGMAC_is_frame_dribbling_errors(u32 status)
{
//u32 synopGMAC_dma_rx_frame_errors(u32 status)
    return ((status & DescRxDribbling) == DescRxDribbling);
}

/**
  * Indicates error in rx frame length.
  * Retruns true if received frame length doesnot match with the length field
  * @param[in] pointer to DmaDesc structure.
  * \return returns true if error else returns false.
  */
bool synopGMAC_is_rx_frame_length_errors(u32 status)
{
//u32 synopGMAC_dma_rx_length_errors(u32 status)
    return ((status & DescRxLengthError) == DescRxLengthError);
}

/**
  * Checks whether this rx descriptor is last rx descriptor.
  * This returns true if it is last descriptor either in ring mode or in chain mode.
  * @param[in] pointer to devic structure.
  * @param[in] pointer to DmaDesc structure.
  * \return returns true if it is last descriptor, false if not.
  * \note This function should not be called before initializing the descriptor using synopGMAC_desc_init().
  */
bool synopGMAC_is_last_rx_desc(synopGMACdevice *gmacdev, DmaDesc *desc)
{
//bool synopGMAC_is_last_desc(DmaDesc *desc)
    return (((desc -> length & RxDescEndOfRing) == RxDescEndOfRing) || ((u64)gmacdev -> RxDesc == desc -> data2));
}

/**
  * Checks whether this tx descriptor is last tx descriptor.
  * This returns true if it is last descriptor either in ring mode or in chain mode.
  * @param[in] pointer to devic structure.
  * @param[in] pointer to DmaDesc structure.
  * \return returns true if it is last descriptor, false if not.
  * \note This function should not be called before initializing the descriptor using synopGMAC_desc_init().
  */
bool synopGMAC_is_last_tx_desc(synopGMACdevice *gmacdev, DmaDesc *desc)
{
//bool synopGMAC_is_last_desc(DmaDesc *desc)
#ifdef ENH_DESC
    return (((desc->status & TxDescEndOfRing) == TxDescEndOfRing) || ((u64)gmacdev -> TxDesc == desc -> data2));
#else
    return (((desc->length & TxDescEndOfRing) == TxDescEndOfRing) || ((u64)gmacdev -> TxDesc == desc -> data2));
#endif
}

/**
  * Checks whether this rx descriptor is in chain mode.
  * This returns true if it is this descriptor is in chain mode.
  * @param[in] pointer to DmaDesc structure.
  * \return returns true if chain mode is set, false if not.
  */
bool synopGMAC_is_rx_desc_chained(DmaDesc *desc)
{
    return ((desc -> length & RxDescChain) == RxDescChain);
}

/**
  * Checks whether this tx descriptor is in chain mode.
  * This returns true if it is this descriptor is in chain mode.
  * @param[in] pointer to DmaDesc structure.
  * \return returns true if chain mode is set, false if not.
  */
bool synopGMAC_is_tx_desc_chained(DmaDesc *desc)
{
#ifdef ENH_DESC
    return ((desc -> status & TxDescChain) == TxDescChain);
#else
    return ((desc -> length & TxDescChain) == TxDescChain);
#endif
}

/**
  * Driver Api to get the descriptor field information.
  * This returns the status, dma-able address of buffer1, the length of buffer1, virtual address of buffer1
  * dma-able address of buffer2, length of buffer2, virtural adddress of buffer2.
  * @param[in]  pointer to DmaDesc structure.
  * @param[out] pointer to status field fo descriptor.
  * @param[out] dma-able address of buffer1.
  * @param[out] length of buffer1.
  * @param[out] virtual address of buffer1.
  * @param[out] dma-able address of buffer2.
  * @param[out] length of buffer2.
  * @param[out] virtual address of buffer2.
  * \return returns void.
  */
void synopGMAC_get_desc_data(DmaDesc *desc, u32 *Status, u32 *Buffer1, u32 *Length1, u64 *Data1, u32 *Buffer2, u32 *Length2, u64 *Data2)
{

    if (Status != 0)
    {
        *Status = desc -> status;
    }

    if (Buffer1 != 0)
    {
        *Buffer1 = desc -> buffer1;
    }

    if (Length1 != 0)
    {
        *Length1 = (desc -> length & DescSize1Mask) >> DescSize1Shift;
    }

    if (Data1 != 0)
    {
        *Data1 = desc -> data1;
    }

    if (Buffer2 != 0)
    {
        *Buffer2 = desc -> buffer2;
    }

    if (Length2 != 0)
    {
        *Length2 = (desc -> length & DescSize2Mask) >> DescSize2Shift;
    }

    if (Data2 != 0)
    {
        *Data2 = desc -> data2;
    }

    return;
}

#ifdef ENH_DESC_8W
/**
  * This function is defined two times. Once when the code is compiled for ENHANCED DESCRIPTOR SUPPORT and Once for Normal descriptor
  * Get the index and address of Tx desc.
  * This api is same for both ring mode and chain mode.
  * This function tracks the tx descriptor the DMA just closed after the transmission of data from this descriptor is
  * over. This returns the descriptor fields to the caller.
  * @param[in] pointer to synopGMACdevice.
  * @param[out] status field of the descriptor.
  * @param[out] Dma-able buffer1 pointer.
  * @param[out] length of buffer1 (Max is 2048).
  * @param[out] virtual pointer for buffer1.
  * @param[out] Dma-able buffer2 pointer.
  * @param[out] length of buffer2 (Max is 2048).
  * @param[out] virtual pointer for buffer2.
  * @param[out] u32 data indicating whether the descriptor is in ring mode or chain mode.
  * \return returns present tx descriptor index on success. Negative value if error.
  */
s32 synopGMAC_get_tx_qptr(synopGMACdevice *gmacdev, u32 *Status, u32 *Buffer1, u32 *Length1, u64 *Data1, u32 *Buffer2, u32 *Length2, u64 *Data2,
                          u32 *Ext_Status, u32 *Time_Stamp_High, u32 *Time_Stamp_Low)
{
    u32  txover      = gmacdev->TxBusy;
    DmaDesc *txdesc = gmacdev->TxBusyDesc;

    if (synopGMAC_is_desc_owned_by_dma(txdesc))
        return -1;
    if (synopGMAC_is_desc_empty(txdesc))
        return -1;

    (gmacdev->BusyTxDesc)--; //busy tx descriptor is reduced by one as it will be handed over to Processor now

    if (Status != 0)
        *Status = txdesc->status;

    if (Ext_Status != 0)
        *Ext_Status = txdesc->extstatus;
    if (Time_Stamp_High != 0)
        *Time_Stamp_High = txdesc->timestamphigh;
    if (Time_Stamp_Low != 0)
        *Time_Stamp_High = txdesc->timestamplow;

    if (Buffer1 != 0)
        *Buffer1 = txdesc->buffer1;
    if (Length1 != 0)
        *Length1 = (txdesc->length & DescSize1Mask) >> DescSize1Shift;
    if (Data1 != 0)
        *Data1 = txdesc->data1;

    if (Buffer2 != 0)
        *Buffer2 = txdesc->buffer2;
    if (Length2 != 0)
        *Length2 = (txdesc->length & DescSize2Mask) >> DescSize2Shift;
    if (Data1 != 0)
        *Data2 = txdesc->data2;

    gmacdev->TxBusy     = synopGMAC_is_last_tx_desc(gmacdev, txdesc) ? 0 : txover + 1;

    if (synopGMAC_is_tx_desc_chained(txdesc))
    {
        gmacdev->TxBusyDesc = (DmaDesc *)txdesc->data2;
        synopGMAC_tx_desc_init_chain(txdesc);
    }
    else
    {
        gmacdev->TxBusyDesc = synopGMAC_is_last_tx_desc(gmacdev, txdesc) ? gmacdev->TxDesc : (txdesc + 1);
        synopGMAC_tx_desc_init_ring(txdesc, synopGMAC_is_last_tx_desc(gmacdev, txdesc));
    }
    TR("%02d %08x %08x %08x %08x %08x %08x %08x\n", txover, (u32)txdesc, txdesc->status, txdesc->length, txdesc->buffer1, txdesc->buffer2, txdesc->data1, txdesc->data2);

    return txover;
}
#else

/**
  * Get the index and address of Tx desc.
  * This api is same for both ring mode and chain mode.
  * This function tracks the tx descriptor the DMA just closed after the transmission of data from this descriptor is
  * over. This returns the descriptor fields to the caller.
  * @param[in] pointer to synopGMACdevice.
  * @param[out] status field of the descriptor.
  * @param[out] Dma-able buffer1 pointer.
  * @param[out] length of buffer1 (Max is 2048).
  * @param[out] virtual pointer for buffer1.
  * @param[out] Dma-able buffer2 pointer.
  * @param[out] length of buffer2 (Max is 2048).
  * @param[out] virtual pointer for buffer2.
  * @param[out] u32 data indicating whether the descriptor is in ring mode or chain mode.
  * \return returns present tx descriptor index on success. Negative value if error.
  */
s32 synopGMAC_get_tx_qptr(synopGMACdevice *gmacdev, u32 *Status, u32 *Buffer1, u32 *Length1, u64 *Data1, u32 *Buffer2, u32 *Length2, u64 *Data2)
{
    u32  txover      = gmacdev->TxBusy;
    DmaDesc *txdesc = gmacdev->TxBusyDesc;
    int i;
//sw: dbg
    //pci_sync_cache(0, (vm_offset_t)txdesc, 64, SYNC_R);
    //pci_sync_cache(0, (vm_offset_t)txdesc, 64, SYNC_W);
#if SYNOP_TX_DEBUG
    printf("Cache sync before get a used tx dma desc!\n");
    printf("\n==%02d %08x %08x %08x %08x %08x %08x %08x\n", txover, (u32)txdesc, txdesc->status, txdesc->length, txdesc->buffer1, txdesc->buffer2, txdesc->data1, txdesc->data2);
#endif
    if (synopGMAC_is_desc_owned_by_dma(txdesc))
    {
        return -1;
    }
//    gmacdev->TxBusy     = synopGMAC_is_last_tx_desc(gmacdev,txdesc) ? 0 : txover + 1;
//    gmacdev->TxBusyDesc = synopGMAC_is_last_tx_desc(gmacdev,txdesc) ? gmacdev->TxDesc : (txdesc + 1);
    if (synopGMAC_is_desc_empty(txdesc))
    {
        return -1;
    }
    (gmacdev->BusyTxDesc)--; //busy tx descriptor is reduced by one as it will be handed over to Processor now

    if (Status != 0)
        *Status = txdesc->status;

    if (Buffer1 != 0)
        *Buffer1 = txdesc->buffer1;
    if (Length1 != 0)
        *Length1 = (txdesc->length & DescSize1Mask) >> DescSize1Shift;
    if (Data1 != 0)
        *Data1 = txdesc->data1;

    if (Buffer2 != 0)
        *Buffer2 = txdesc->buffer2;
    if (Length2 != 0)
        *Length2 = (txdesc->length & DescSize2Mask) >> DescSize2Shift;
    if (Data1 != 0)
        *Data2 = txdesc->data2;

    gmacdev->TxBusy     = synopGMAC_is_last_tx_desc(gmacdev, txdesc) ? 0 : txover + 1;

    if (synopGMAC_is_tx_desc_chained(txdesc))
    {
        gmacdev->TxBusyDesc = (DmaDesc *)txdesc->data2;
        synopGMAC_tx_desc_init_chain(txdesc);
    }
    else
    {
        gmacdev->TxBusyDesc = synopGMAC_is_last_tx_desc(gmacdev, txdesc) ? gmacdev->TxDesc : (txdesc + 1);
        synopGMAC_tx_desc_init_ring(txdesc, synopGMAC_is_last_tx_desc(gmacdev, txdesc));
    }
    //printf("%02d %08x %08x %08x %08x %08x %08x %08x\n",txover,(u32)txdesc,txdesc->status,txdesc->length,txdesc->buffer1,txdesc->buffer2,txdesc->data1,txdesc->data2);
    //pci_sync_cache(0, (vm_offset_t)txdesc, 64, SYNC_W);
#if SYNOP_TX_DEBUG
    printf("Cache sync after re-init a tx dma desc!\n");
#endif

    return txover;
}

#endif
/**
  * Populate the tx desc structure with the buffer address.
  * Once the driver has a packet ready to be transmitted, this function is called with the
  * valid dma-able buffer addresses and their lengths. This function populates the descriptor
  * and make the DMA the owner for the descriptor. This function also controls whether Checksum
  * offloading to be done in hardware or not.
  * This api is same for both ring mode and chain mode.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] Dma-able buffer1 pointer.
  * @param[in] length of buffer1 (Max is 2048).
  * @param[in] virtual pointer for buffer1.
  * @param[in] Dma-able buffer2 pointer.
  * @param[in] length of buffer2 (Max is 2048).
  * @param[in] virtual pointer for buffer2.
  * @param[in] u32 data indicating whether the descriptor is in ring mode or chain mode.
  * @param[in] u32 indicating whether the checksum offloading in HW/SW.
  * \return returns present tx descriptor index on success. Negative value if error.
  */
u32 len;
s32 synopGMAC_set_tx_qptr(synopGMACdevice *gmacdev, u32 Buffer1, u32 Length1, u64 Data1, u32 Buffer2, u32 Length2, u64 Data2, u32 offload_needed, u32 *index, DmaDesc *Dpr)
{
    u32  txnext      = gmacdev->TxNext;
    DmaDesc *txdesc = gmacdev->TxNextDesc;

    *index = txnext;
    Dpr = txdesc;

    if (!synopGMAC_is_desc_empty(txdesc))
    {
        TR("set tx qptr: desc empty!\n");
        return -1;
    }

    (gmacdev->BusyTxDesc)++; //busy tx descriptor is reduced by one as it will be handed over to Processor now

    if (synopGMAC_is_tx_desc_chained(txdesc))
    {
        txdesc->length |= ((Length1 << DescSize1Shift) & DescSize1Mask);
#ifdef ENH_DESC
        txdesc->status |= (DescTxFirst | DescTxLast | DescTxIntEnable);  //ENH_DESC
#else
        txdesc->length |= (DescTxFirst | DescTxLast | DescTxIntEnable);  //Its always assumed that complete data will fit in to one descriptor
#endif

        txdesc->buffer1 = Buffer1;
        txdesc->data1 = Data1;

        if (offload_needed)
        {
            /*
             Make sure that the OS you are running supports the IP and TCP checkusm offloaidng,
             before calling any of the functions given below.
             */
            synopGMAC_tx_checksum_offload_ipv4hdr(gmacdev, txdesc);
            synopGMAC_tx_checksum_offload_tcponly(gmacdev, txdesc);
//        synopGMAC_tx_checksum_offload_tcp_pseudo(gmacdev, txdesc);
        }
#ifdef ENH_DESC
        txdesc->status |= DescOwnByDma;//ENH_DESC
#else
        txdesc->status = DescOwnByDma;
#endif

        gmacdev->TxNext = synopGMAC_is_last_tx_desc(gmacdev, txdesc) ? 0 : txnext + 1;
        gmacdev->TxNextDesc = (DmaDesc *)txdesc->data2;
    }
    else
    {
//      printf("synopGMAC_set_tx_qptr:in ring mode\n");
        txdesc->length |= (((Length1 << DescSize1Shift) & DescSize1Mask) | ((Length2 << DescSize2Shift) & DescSize2Mask));
#ifdef ENH_DESC
        txdesc->status |= (DescTxFirst | DescTxLast | DescTxIntEnable);  //ENH_DESC
#else
        txdesc->length |= (DescTxFirst | DescTxLast | DescTxIntEnable);  //Its always assumed that complete data will fit in to one descriptor
#endif

        txdesc->buffer1 = Buffer1;
        txdesc->data1 = Data1;

        txdesc->buffer2 = Buffer2;
        txdesc->data2 = Data2;

        if (offload_needed)
        {
            /*
             Make sure that the OS you are running supports the IP and TCP checkusm offloaidng,
             before calling any of the functions given below.
             */
//sw: i am not sure about the checksum.so i omit it in the outside
            synopGMAC_tx_checksum_offload_ipv4hdr(gmacdev, txdesc);
            synopGMAC_tx_checksum_offload_tcponly(gmacdev, txdesc);
//        synopGMAC_tx_checksum_offload_tcp_pseudo(gmacdev, txdesc);
        }
#ifdef ENH_DESC
        txdesc->status |= DescOwnByDma;//ENH_DESC
#else
//        printf("synopGMAC_set_tx_qptr:give the tx descroptor to dma\n");
        txdesc->status = DescOwnByDma;
#endif

        gmacdev->TxNext = synopGMAC_is_last_tx_desc(gmacdev, txdesc) ? 0 : txnext + 1;
        gmacdev->TxNextDesc = synopGMAC_is_last_tx_desc(gmacdev, txdesc) ? gmacdev->TxDesc : (txdesc + 1);
    }


#if SYNOP_TX_DEBUG
    printf("%02d %08x %08x %08x %08x %08x %08x %08x\n", txnext, (u32)txdesc, txdesc->status, txdesc->length, txdesc->buffer1, txdesc->buffer2, txdesc->data1, txdesc->data2);
#endif
    //pci_sync_cache(0, (vm_offset_t)txdesc, 64, SYNC_W);
#if SYNOP_TX_DEBUG
    printf("Cache sync to set a tx desc!\n");
#endif
    //pci_sync_cache(0, (vm_offset_t)(txdesc->data1), 32, SYNC_W);
#if SYNOP_TX_DEBUG
    //printf("Cache sync for data in the buf of the tx desc!\n");
#endif
    return txnext;
}
#ifdef ENH_DESC_8W
/**
  * Prepares the descriptor to receive packets.
  * The descriptor is allocated with the valid buffer addresses (sk_buff address) and the length fields
  * and handed over to DMA by setting the ownership. After successful return from this function the
  * descriptor is added to the receive descriptor pool/queue.
  * This api is same for both ring mode and chain mode.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] Dma-able buffer1 pointer.
  * @param[in] length of buffer1 (Max is 2048).
  * @param[in] Dma-able buffer2 pointer.
  * @param[in] length of buffer2 (Max is 2048).
  * @param[in] u32 data indicating whether the descriptor is in ring mode or chain mode.
  * \return returns present rx descriptor index on success. Negative value if error.
  */
//                                                        dma_addr  RX_BUF_SIZE     skb
s32 synopGMAC_set_rx_qptr(synopGMACdevice *gmacdev, u32 Buffer1, u32 Length1, u64 Data1, u32 Buffer2, u32 Length2, u64 Data2)
{
    u32  rxnext      = gmacdev->RxNext;
    DmaDesc *rxdesc = gmacdev->RxNextDesc;

    if (!synopGMAC_is_desc_empty(rxdesc))
        return -1;

    if (synopGMAC_is_rx_desc_chained(rxdesc))
    {
        rxdesc->length |= ((Length1 << DescSize1Shift) & DescSize1Mask);

        rxdesc->buffer1 = Buffer1;
        rxdesc->data1 = Data1;

        rxdesc->extstatus = 0;
        rxdesc->reserved1 = 0;
        rxdesc->timestamplow = 0;
        rxdesc->timestamphigh = 0;

        if ((rxnext % MODULO_INTERRUPT) != 0)
            rxdesc->length |= RxDisIntCompl;

        rxdesc->status = DescOwnByDma;

        gmacdev->RxNext     = synopGMAC_is_last_rx_desc(gmacdev, rxdesc) ? 0 : rxnext + 1;
        gmacdev->RxNextDesc = (DmaDesc *)rxdesc->data2;
    }
    else
    {
        rxdesc->length |= (((Length1 << DescSize1Shift) & DescSize1Mask) | ((Length2 << DescSize2Shift) & DescSize2Mask));

        rxdesc->buffer1 = Buffer1;
        rxdesc->data1 = Data1;

        rxdesc->extstatus = 0;
        rxdesc->reserved1 = 0;
        rxdesc->timestamplow = 0;
        rxdesc->timestamphigh = 0;

        rxdesc->buffer2 = Buffer2;
        rxdesc->data2 = Data2;

        if ((rxnext % MODULO_INTERRUPT) != 0)
            rxdesc->length |= RxDisIntCompl;

        rxdesc->status = DescOwnByDma;
        gmacdev->RxNext     = synopGMAC_is_last_rx_desc(gmacdev, rxdesc) ? 0 : rxnext + 1;
        gmacdev->RxNextDesc = synopGMAC_is_last_rx_desc(gmacdev, rxdesc) ? gmacdev->RxDesc : (rxdesc + 1);
    }
#if SYNOP_RX_DEBUG
    TR("%02d %08x %08x %08x %08x %08x %08x %08x %08x %08x\n", rxnext, (u32)rxdesc, rxdesc->status, rxdesc->length, rxdesc->buffer1, rxdesc->buffer2, rxdesc->data1, rxdesc->data2, rxdesc->dummy1, rxdesc->dummy2);
#endif

    (gmacdev->BusyRxDesc)++; //One descriptor will be given to Hardware. So busy count incremented by one
    //pci_sync_cache(0, (vm_offset_t)rxdesc,64, SYNC_W);
    return rxnext;
}

#else
/**
  * Prepares the descriptor to receive packets.
  * The descriptor is allocated with the valid buffer addresses (sk_buff address) and the length fields
  * and handed over to DMA by setting the ownership. After successful return from this function the
  * descriptor is added to the receive descriptor pool/queue.
  * This api is same for both ring mode and chain mode.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] Dma-able buffer1 pointer.
  * @param[in] length of buffer1 (Max is 2048).
  * @param[in] Dma-able buffer2 pointer.
  * @param[in] length of buffer2 (Max is 2048).
  * @param[in] u32 data indicating whether the descriptor is in ring mode or chain mode.
  * \return returns present rx descriptor index on success. Negative value if error.
  */
s32 synopGMAC_set_rx_qptr(synopGMACdevice *gmacdev, u32 Buffer1, u32 Length1, u64 Data1, u32 Buffer2, u32 Length2, u64 Data2)
{
    u32  rxnext      = gmacdev->RxNext;
    DmaDesc *rxdesc = gmacdev->RxNextDesc;

    if (!synopGMAC_is_desc_empty(rxdesc))
        return -1;

    if (synopGMAC_is_rx_desc_chained(rxdesc))
    {
        rxdesc->length |= ((Length1 << DescSize1Shift) & DescSize1Mask);

        rxdesc->buffer1 = Buffer1;
        rxdesc->data1 = Data1;

        if ((rxnext % MODULO_INTERRUPT) != 0)
            rxdesc->length |= RxDisIntCompl;

        rxdesc->status = DescOwnByDma;

        gmacdev->RxNext     = synopGMAC_is_last_rx_desc(gmacdev, rxdesc) ? 0 : rxnext + 1;
        gmacdev->RxNextDesc = (DmaDesc *)rxdesc->data2;
    }
    else
    {
        rxdesc->length |= (((Length1 << DescSize1Shift) & DescSize1Mask) | ((Length2 << DescSize2Shift) & DescSize2Mask));

        rxdesc->buffer1 = Buffer1;
        rxdesc->data1 = Data1;

        rxdesc->buffer2 = Buffer2;
        rxdesc->data2 = Data2;

        if ((rxnext % MODULO_INTERRUPT) != 0)
            rxdesc->length |= RxDisIntCompl;

        rxdesc->status = DescOwnByDma;

        gmacdev->RxNext     = synopGMAC_is_last_rx_desc(gmacdev, rxdesc) ? 0 : rxnext + 1;
        gmacdev->RxNextDesc = synopGMAC_is_last_rx_desc(gmacdev, rxdesc) ? gmacdev->RxDesc : (rxdesc + 1);
    }
#if SYNOP_RX_DEBUG
    TR("%02d %08x %08x %08x %08x %08x %08x %08x\n", rxnext, (u32)rxdesc, rxdesc->status, rxdesc->length, rxdesc->buffer1, rxdesc->buffer2, rxdesc->data1, rxdesc->data2);
#endif
    (gmacdev->BusyRxDesc)++; //One descriptor will be given to Hardware. So busy count incremented by one

    return rxnext;
}

s32 synopGMAC_set_rx_qptr_init(synopGMACdevice *gmacdev, u32 Buffer1, u32 Length1, u64 Data1, u32 Buffer2, u32 Length2, u64 Data2)
{
    u32  rxnext      = gmacdev->RxNext;
    DmaDesc *rxdesc = gmacdev->RxNextDesc;

    /* sw
        if(synopGMAC_is_desc_owned_by_dma(rxdesc))
            return -1;
    */

    if (!synopGMAC_is_desc_empty(rxdesc))
        return -1;

    if (synopGMAC_is_rx_desc_chained(rxdesc))
    {
        rxdesc->length |= ((Length1 << DescSize1Shift) & DescSize1Mask);

        rxdesc->buffer1 = Buffer1;
        rxdesc->data1 = Data1;

        if ((rxnext % MODULO_INTERRUPT) != 0)
            rxdesc->length |= RxDisIntCompl;

        rxdesc->status = DescOwnByDma;
        rxdesc->status = 0;

        gmacdev->RxNext     = synopGMAC_is_last_rx_desc(gmacdev, rxdesc) ? 0 : rxnext + 1;
        gmacdev->RxNextDesc = (DmaDesc *)rxdesc->data2;
    }
    else
    {
        rxdesc->length |= (((Length1 << DescSize1Shift) & DescSize1Mask) | ((Length2 << DescSize2Shift) & DescSize2Mask));

        rxdesc->buffer1 = Buffer1;
        rxdesc->data1 = Data1;

        rxdesc->buffer2 = Buffer2;
        rxdesc->data2 = Data2;

        if ((rxnext % MODULO_INTERRUPT) != 0)
            rxdesc->length |= RxDisIntCompl;

        rxdesc->status = DescOwnByDma;
        rxdesc->status = 0;

        gmacdev->RxNext     = synopGMAC_is_last_rx_desc(gmacdev, rxdesc) ? 0 : rxnext + 1;
        gmacdev->RxNextDesc = synopGMAC_is_last_rx_desc(gmacdev, rxdesc) ? gmacdev->RxDesc : (rxdesc + 1);
    }
    TR("%02d %08x %08x %08x %08x %08x %08x %08x\n", rxnext, (u32)rxdesc, rxdesc->status, rxdesc->length, rxdesc->buffer1, rxdesc->buffer2, rxdesc->data1, rxdesc->data2);
    (gmacdev->BusyRxDesc)++; //One descriptor will be given to Hardware. So busy count incremented by one
    return rxnext;
}
#endif
#ifdef ENH_DESC_8W
/**
  * This function is defined two times. Once when the code is compiled for ENHANCED DESCRIPTOR SUPPORT and Once for Normal descriptor
  * Get back the descriptor from DMA after data has been received.
  * When the DMA indicates that the data is received (interrupt is generated), this function should be
  * called to get the descriptor and hence the data buffers received. With successful return from this
  * function caller gets the descriptor fields for processing. check the parameters to understand the
  * fields returned.`
  * @param[in] pointer to synopGMACdevice.
  * @param[out] pointer to hold the status of DMA.
  * @param[out] Dma-able buffer1 pointer.
  * @param[out] pointer to hold length of buffer1 (Max is 2048).
  * @param[out] virtual pointer for buffer1.
  * @param[out] Dma-able buffer2 pointer.
  * @param[out] pointer to hold length of buffer2 (Max is 2048).
  * @param[out] virtual pointer for buffer2.
  * \return returns present rx descriptor index on success. Negative value if error.
  */
s32 synopGMAC_get_rx_qptr(synopGMACdevice *gmacdev, u32 *Status, u32 *Buffer1, u32 *Length1, u64 *Data1, u32 *Buffer2, u32 *Length2, u64 *Data2,
                          u32 *Ext_Status, u32 *Time_Stamp_High, u32 *Time_Stamp_Low)
{
    u32 rxnext       = gmacdev->RxBusy;    // index of descriptor the DMA just completed. May be useful when data
    //is spread over multiple buffers/descriptors
    DmaDesc *rxdesc = gmacdev->RxBusyDesc;
    if (synopGMAC_is_desc_owned_by_dma(rxdesc))
        return -1;
    if (synopGMAC_is_desc_empty(rxdesc))
        return -1;


    if (Status != 0)
        *Status = rxdesc->status;// send the status of this descriptor

    if (Ext_Status != 0)
        *Ext_Status = rxdesc->extstatus;
    if (Time_Stamp_High != 0)
        *Time_Stamp_High = rxdesc->timestamphigh;
    if (Time_Stamp_Low != 0)
        *Time_Stamp_Low = rxdesc->timestamplow;

    if (Length1 != 0)
        *Length1 = (rxdesc->length & DescSize1Mask) >> DescSize1Shift;
    if (Buffer1 != 0)
        *Buffer1 = rxdesc->buffer1;
    if (Data1 != 0)
        *Data1 = rxdesc->data1;

    if (Length2 != 0)
        *Length2 = (rxdesc->length & DescSize2Mask) >> DescSize2Shift;
    if (Buffer2 != 0)
        *Buffer2 = rxdesc->buffer2;
    if (Data1 != 0)
        *Data2 = rxdesc->data2;

    gmacdev->RxBusy     = synopGMAC_is_last_rx_desc(gmacdev, rxdesc) ? 0 : rxnext + 1;

    if (synopGMAC_is_rx_desc_chained(rxdesc))
    {
        gmacdev->RxBusyDesc = (DmaDesc *)rxdesc->data2;
        synopGMAC_rx_desc_init_chain(rxdesc);
        //synopGMAC_desc_init_chain(rxdesc, synopGMAC_is_last_rx_desc(gmacdev,rxdesc),0,0);
    }
    else
    {
        gmacdev->RxBusyDesc = synopGMAC_is_last_rx_desc(gmacdev, rxdesc) ? gmacdev->RxDesc : (rxdesc + 1);
        synopGMAC_rx_desc_init_ring(rxdesc, synopGMAC_is_last_rx_desc(gmacdev, rxdesc));
    }
    TR("%02d %08x %08x %08x %08x %08x %08x %08x\n", rxnext, (u32)rxdesc, rxdesc->status, rxdesc->length, rxdesc->buffer1, rxdesc->buffer2, rxdesc->data1, rxdesc->data2);
    (gmacdev->BusyRxDesc)--; //busy tx descriptor is reduced by one as it will be handed over to Processor now
    return (rxnext);

}
#else

/**
  * Get back the descriptor from DMA after data has been received.
  * When the DMA indicates that the data is received (interrupt is generated), this function should be
  * called to get the descriptor and hence the data buffers received. With successful return from this
  * function caller gets the descriptor fields for processing. check the parameters to understand the
  * fields returned.`
  * @param[in] pointer to synopGMACdevice.
  * @param[out] pointer to hold the status of DMA.
  * @param[out] Dma-able buffer1 pointer.
  * @param[out] pointer to hold length of buffer1 (Max is 2048).
  * @param[out] virtual pointer for buffer1.
  * @param[out] Dma-able buffer2 pointer.
  * @param[out] pointer to hold length of buffer2 (Max is 2048).
  * @param[out] virtual pointer for buffer2.
  * \return returns present rx descriptor index on success. Negative value if error.
  */
s32 synopGMAC_get_rx_qptr(synopGMACdevice *gmacdev, u32 *Status, u32 *Buffer1, u32 *Length1, u64 *Data1, u32 *Buffer2, u32 *Length2, u64 *Data2)
{
    u32 rxnext       = gmacdev->RxBusy;    // index of descriptor the DMA just completed. May be useful when data
    //is spread over multiple buffers/descriptors
    DmaDesc *rxdesc = gmacdev->RxBusyDesc;
    u32 len;
    if (synopGMAC_is_desc_owned_by_dma(rxdesc))
    {
        DEBUG_MES("synopGMAC_get_rx_qptr:DMA descriptor is owned by GMAC!\n");
        return -1;
    }

    if (synopGMAC_is_desc_empty(rxdesc))
    {
        DEBUG_MES("synopGMAC_get_rx_qptr:rx desc is empty!\n");
        return -1;
    }

    if (Status != 0)
        *Status = rxdesc->status;// send the status of this descriptor

    if (Length1 != 0)
        *Length1 = (rxdesc->length & DescSize1Mask) >> DescSize1Shift;
    if (Buffer1 != 0)
        *Buffer1 = rxdesc->buffer1;
    if (Data1 != 0)
        *Data1 = rxdesc->data1;
    if (Length2 != 0)
        *Length2 = (rxdesc->length & DescSize2Mask) >> DescSize2Shift;
    if (Buffer2 != 0)
        *Buffer2 = rxdesc->buffer2;
    if (Data1 != 0)
        *Data2 = rxdesc->data2;

    len =  synopGMAC_get_rx_desc_frame_length(*Status);
    DEBUG_MES("Cache sync for data buffer in rx dma desc: length = 0x%x\n", len);
    gmacdev->RxBusy     = synopGMAC_is_last_rx_desc(gmacdev, rxdesc) ? 0 : rxnext + 1;
    if (synopGMAC_is_rx_desc_chained(rxdesc))
    {
        gmacdev->RxBusyDesc = (DmaDesc *)rxdesc->data2;
        synopGMAC_rx_desc_init_chain(rxdesc);
    }
    else
    {
        gmacdev->RxBusyDesc = synopGMAC_is_last_rx_desc(gmacdev, rxdesc) ? gmacdev->RxDesc : (rxdesc + 1);
//sw: raw data
#if SYNOP_RX_DEBUG
        DEBUG_MES("%02d %08x %08x %08x %08x %08x %08x %08x\n", rxnext, (u32)rxdesc, rxdesc->status, rxdesc->length, rxdesc->buffer1, rxdesc->buffer2, rxdesc->data1, rxdesc->data2);
#endif
        synopGMAC_rx_desc_init_ring(rxdesc, synopGMAC_is_last_rx_desc(gmacdev, rxdesc));
    }
#if SYNOP_RX_DEBUG
    DEBUG_MES("%02d %08x %08x %08x %08x %08x %08x %08x\n", rxnext, (u32)rxdesc, rxdesc->status, rxdesc->length, rxdesc->buffer1, rxdesc->buffer2, rxdesc->data1, rxdesc->data2);
#endif

    (gmacdev->BusyRxDesc)--; //This returns one descriptor to processor. So busy count will be decremented by one
    return (rxnext);

}

#endif

/**
  * Clears all the pending interrupts.
  * If the Dma status register is read then all the interrupts gets cleared
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_clear_interrupt(synopGMACdevice *gmacdev)
{
    u32 data;
    data = synopGMACReadReg(gmacdev->DmaBase, DmaStatus);
    TR("DMA status reg = 0x%x before cleared!\n", data);
    synopGMACWriteReg(gmacdev->DmaBase, DmaStatus, data);
    //     plat_delay(DEFAULT_LOOP_VARIABLE);
//    data = synopGMACReadReg(gmacdev->DmaBase, DmaStatus);
    TR("DMA status reg = 0x%x after cleared!\n", data);
}

/**
  * Returns the all unmasked interrupt status after reading the DmaStatus register.
  * @param[in] pointer to synopGMACdevice.
  * \return 0 upon success. Error code upon failure.
  */
u32 synopGMAC_get_interrupt_type(synopGMACdevice *gmacdev)
{
    u32 data;
    u32 interrupts = 0;
    data = synopGMACReadReg(gmacdev->DmaBase, DmaStatus);

    //data = data & ~0x84;    //sw: some bits shoud not be cleaned
    synopGMACWriteReg(gmacdev->DmaBase, DmaStatus, data); //manju: I think this is the appropriate location to clear the interrupts
    plat_delay(DEFAULT_LOOP_VARIABLE);
    if (data & DmaIntErrorMask)    interrupts |= synopGMACDmaError;
    if (data & DmaIntRxNormMask)    interrupts |= synopGMACDmaRxNormal;
    if (data & DmaIntRxAbnMask)    interrupts |= synopGMACDmaRxAbnormal;
    if (data & DmaIntRxStoppedMask)    interrupts |= synopGMACDmaRxStopped;
    if (data & DmaIntTxNormMask)    interrupts |= synopGMACDmaTxNormal;
    if (data & DmaIntTxAbnMask)    interrupts |= synopGMACDmaTxAbnormal;
    if (data & DmaIntTxStoppedMask)    interrupts |= synopGMACDmaTxStopped;

    return interrupts;
}

/**
  * Returns the interrupt mask.
  * @param[in] pointer to synopGMACdevice.
  * \return 0 upon success. Error code upon failure.
  */
#if UNUSED
u32 synopGMAC_get_interrupt_mask(synopGMACdevice *gmacdev)
{
    return (synopGMACReadReg(gmacdev->DmaBase, DmaInterrupt));
}
#endif

/**
  * Enable all the interrupts.
  * Enables the DMA interrupt as specified by the bit mask.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] bit mask of interrupts to be enabled.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_enable_interrupt(synopGMACdevice *gmacdev, u32 interrupts)
{
    synopGMACWriteReg(gmacdev->DmaBase, DmaInterrupt, interrupts);
    return;
}
#endif


/**
  * Disable all the interrupts.
  * Disables all DMA interrupts.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  * \note This function disabled all the interrupts, if you want to disable a particular interrupt then
  *  use synopGMAC_disable_interrupt().
  */
void synopGMAC_disable_interrupt_all(synopGMACdevice *gmacdev)
{
//    rt_kprintf("dmabase = 0x%x\n",gmacdev->DmaBase);
    synopGMACWriteReg(gmacdev->DmaBase, DmaInterrupt, DmaIntDisable);
//    synopGMACReadReg(gmacdev->DmaBase, DmaInterrupt);
    return;
}

/**
  * Disable interrupt according to the bitfield supplied.
  * Disables only those interrupts specified in the bit mask in second argument.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] bit mask for interrupts to be disabled.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_disable_interrupt(synopGMACdevice *gmacdev, u32 interrupts)
{
    synopGMACClearBits(gmacdev->DmaBase, DmaInterrupt, interrupts);
    return;
}
#endif
/**
  * Enable the DMA Reception.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_enable_dma_rx(synopGMACdevice *gmacdev)
{
//    synopGMACSetBits(gmacdev->DmaBase, DmaControl, DmaRxStart);
    u32 data;
    data = synopGMACReadReg(gmacdev->DmaBase, DmaControl);
    data |= DmaRxStart;
    TR0(" ===33334\n");
    synopGMACWriteReg(gmacdev->DmaBase, DmaControl, data);
    TR0(" ===33344\n");
}

/**
  * Enable the DMA Transmission.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_enable_dma_tx(synopGMACdevice *gmacdev)
{
//    synopGMACSetBits(gmacdev->DmaBase, DmaControl, DmaTxStart);
    u32 data;
    data = synopGMACReadReg(gmacdev->DmaBase, DmaControl);
    data |= DmaTxStart;
    synopGMACWriteReg(gmacdev->DmaBase, DmaControl, data);

}

/**
  * Resumes the DMA Transmission.
  * the DmaTxPollDemand is written. (the data writeen could be anything).
  * This forces the DMA to resume transmission.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_resume_dma_tx(synopGMACdevice *gmacdev)
{
    synopGMACWriteReg(gmacdev->DmaBase, DmaTxPollDemand, 1);

}
/**
  * Resumes the DMA Reception.
  * the DmaRxPollDemand is written. (the data writeen could be anything).
  * This forces the DMA to resume reception.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_resume_dma_rx(synopGMACdevice *gmacdev)
{
    synopGMACWriteReg(gmacdev->DmaBase, DmaRxPollDemand, 0);

}
/**
  * Take ownership of this Descriptor.
  * The function is same for both the ring mode and the chain mode DMA structures.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_take_desc_ownership(DmaDesc *desc)
{
    if (desc)
    {
        desc->status &= ~DescOwnByDma;  //Clear the DMA own bit
//        desc->status |= DescError;    // Set the error to indicate this descriptor is bad
    }
}

/**
  * Take ownership of all the rx Descriptors.
  * This function is called when there is fatal error in DMA transmission.
  * When called it takes the ownership of all the rx descriptor in rx descriptor pool/queue from DMA.
  * The function is same for both the ring mode and the chain mode DMA structures.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  * \note Make sure to disable the transmission before calling this function, otherwise may result in racing situation.
  */
void synopGMAC_take_desc_ownership_rx(synopGMACdevice *gmacdev)
{
    s32 i;
    DmaDesc *desc;
    desc = gmacdev->RxDesc;
    for (i = 0; i < gmacdev->RxDescCount; i++)
    {
        if (synopGMAC_is_rx_desc_chained(desc))    //This descriptor is in chain mode
        {

            synopGMAC_take_desc_ownership(desc);
            desc = (DmaDesc *)desc->data2;
        }
        else
        {
            synopGMAC_take_desc_ownership(desc + i);
        }
    }
}

/**
  * Take ownership of all the rx Descriptors.
  * This function is called when there is fatal error in DMA transmission.
  * When called it takes the ownership of all the tx descriptor in tx descriptor pool/queue from DMA.
  * The function is same for both the ring mode and the chain mode DMA structures.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  * \note Make sure to disable the transmission before calling this function, otherwise may result in racing situation.
  */
void synopGMAC_take_desc_ownership_tx(synopGMACdevice *gmacdev)
{
    s32 i;
    DmaDesc *desc;
    desc = gmacdev->TxDesc;
    for (i = 0; i < gmacdev->TxDescCount; i++)
    {
        if (synopGMAC_is_tx_desc_chained(desc))    //This descriptor is in chain mode
        {
            synopGMAC_take_desc_ownership(desc);
            desc = (DmaDesc *)desc->data2;
        }
        else
        {
            synopGMAC_take_desc_ownership(desc + i);
        }
    }
}

/**
  * Disable the DMA for Transmission.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */

void synopGMAC_disable_dma_tx(synopGMACdevice *gmacdev)
{
//    synopGMACClearBits(gmacdev->DmaBase, DmaControl, DmaTxStart);
    u32 data;
    data = synopGMACReadReg(gmacdev->DmaBase, DmaControl);
    data &= (~DmaTxStart);
    synopGMACWriteReg(gmacdev->DmaBase, DmaControl, data);
}
/**
  * Disable the DMA for Reception.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_disable_dma_rx(synopGMACdevice *gmacdev)
{
//    synopGMACClearBits(gmacdev->DmaBase, DmaControl, DmaRxStart);
    u32 data;
    data = synopGMACReadReg(gmacdev->DmaBase, DmaControl);
    data &= (~DmaRxStart);
    synopGMACWriteReg(gmacdev->DmaBase, DmaControl, data);
}
/*******************PMT APIs***************************************/
/**
  * Enables the assertion of PMT interrupt.
  * This enables the assertion of PMT interrupt due to Magic Pkt or Wakeup frame
  * reception.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_pmt_int_enable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->MacBase, GmacInterruptMask, GmacPmtIntMask);
    return;
}
#endif
/**
  * Disables the assertion of PMT interrupt.
  * This disables the assertion of PMT interrupt due to Magic Pkt or Wakeup frame
  * reception.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_pmt_int_disable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacInterruptMask, GmacPmtIntMask);
    return;
}
/**
  * Enables the power down mode of GMAC.
  * This function puts the Gmac in power down mode.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_power_down_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacPmtCtrlStatus, GmacPmtPowerDown);
    return;
}
#endif
/**
  * Disables the powerd down setting of GMAC.
  * If the driver wants to bring up the GMAC from powerdown mode, even though the magic packet or the
  * wake up frames received from the network, this function should be called.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_power_down_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->MacBase, GmacPmtCtrlStatus, GmacPmtPowerDown);
    return;
}
#endif
/**
  * Enables the pmt interrupt generation in powerdown mode.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_enable_pmt_interrupt(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->MacBase, GmacInterruptMask, GmacPmtIntMask);
}
#endif
/**
  * Disables the pmt interrupt generation in powerdown mode.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_disable_pmt_interrupt(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacInterruptMask, GmacPmtIntMask);
}
#endif
/**
  * Enables GMAC to look for Magic packet.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_magic_packet_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacPmtCtrlStatus, GmacPmtMagicPktEnable);
    return;
}
#endif

/**
  * Enables GMAC to look for wake up frame.
  * Wake up frame is defined by the user.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_wakeup_frame_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacPmtCtrlStatus, GmacPmtWakeupFrameEnable);
    return;
}
#endif

/**
  * Enables wake-up frame filter to handle unicast packets.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_pmt_unicast_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacPmtCtrlStatus, GmacPmtGlobalUnicast);
    return;
}
#endif
/**
  * Checks whether the packet received is a magic packet?.
  * @param[in] pointer to synopGMACdevice.
  * \return returns True if magic packet received else returns false.
  */
bool synopGMAC_is_magic_packet_received(synopGMACdevice *gmacdev)
{
    u32 data;
    data =     synopGMACReadReg(gmacdev->MacBase, GmacPmtCtrlStatus);
    return ((data & GmacPmtMagicPktReceived) == GmacPmtMagicPktReceived);
}
/**
  * Checks whether the packet received is a wakeup frame?.
  * @param[in] pointer to synopGMACdevice.
  * \return returns true if wakeup frame received else returns false.
  */
bool synopGMAC_is_wakeup_frame_received(synopGMACdevice *gmacdev)
{
    u32 data;
    data =     synopGMACReadReg(gmacdev->MacBase, GmacPmtCtrlStatus);
    return ((data & GmacPmtWakeupFrameReceived) == GmacPmtWakeupFrameReceived);
}

/**
  * Populates the remote wakeup frame registers.
  * Consecutive 8 writes to GmacWakeupAddr writes the wakeup frame filter registers.
  * Before commensing a new write, frame filter pointer is reset to 0x0000.
  * A small delay is introduced to allow frame filter pointer reset operation.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] pointer to frame filter contents array.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_write_wakeup_frame_register(synopGMACdevice *gmacdev, u32 *filter_contents)
{
    s32 i;
    synopGMACSetBits(gmacdev->MacBase, GmacPmtCtrlStatus, GmacPmtFrmFilterPtrReset);
    plat_delay(10);
    for (i = 0; i < WAKEUP_REG_LENGTH; i++)
        synopGMACWriteReg(gmacdev->MacBase, GmacWakeupAddr,  *(filter_contents + i));
    return;

}
#endif

/*******************PMT APIs***************************************/
/*******************MMC APIs***************************************/
/**
  * Freezes the MMC counters.
  * This function call freezes the MMC counters. None of the MMC counters are updated
  * due to any tx or rx frames until synopGMAC_mmc_counters_resume is called.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_mmc_counters_stop(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacMmcCntrl, GmacMmcCounterFreeze);
    return;
}
#endif
/**
  * Resumes the MMC counter updation.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_mmc_counters_resume(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->MacBase, GmacMmcCntrl, GmacMmcCounterFreeze);
    return;
}
#endif
/**
  * Configures the MMC in Self clearing mode.
  * Programs MMC interface so that counters are cleared when the counters are read.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_mmc_counters_set_selfclear(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacMmcCntrl, GmacMmcCounterResetOnRead);
    return;
}
#endif
/**
  * Configures the MMC in non-Self clearing mode.
  * Programs MMC interface so that counters are cleared when the counters are read.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_mmc_counters_reset_selfclear(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->MacBase, GmacMmcCntrl, GmacMmcCounterResetOnRead);
    return;
}
#endif
/**
  * Configures the MMC to stop rollover.
  * Programs MMC interface so that counters will not rollover after reaching maximum value.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_mmc_counters_disable_rollover(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacMmcCntrl, GmacMmcCounterStopRollover);
    return;
}
/**
  * Configures the MMC to rollover.
  * Programs MMC interface so that counters will rollover after reaching maximum value.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_mmc_counters_enable_rollover(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->MacBase, GmacMmcCntrl, GmacMmcCounterStopRollover);
    return;
}

/**
  * Read the MMC Counter.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] the counter to be read.
  * \return returns the read count value.
  */
u32 synopGMAC_read_mmc_counter(synopGMACdevice *gmacdev, u32 counter)
{
    return (synopGMACReadReg(gmacdev->MacBase, counter));
}
#endif
/**
  * Read the MMC Rx interrupt status.
  * @param[in] pointer to synopGMACdevice.
  * \return returns the Rx interrupt status.
  */
u32 synopGMAC_read_mmc_rx_int_status(synopGMACdevice *gmacdev)
{
    return (synopGMACReadReg(gmacdev->MacBase, GmacMmcIntrRx));
}
/**
  * Read the MMC Tx interrupt status.
  * @param[in] pointer to synopGMACdevice.
  * \return returns the Tx interrupt status.
  */
u32 synopGMAC_read_mmc_tx_int_status(synopGMACdevice *gmacdev)
{
    return (synopGMACReadReg(gmacdev->MacBase, GmacMmcIntrTx));
}
/**
  * Disable the MMC Tx interrupt.
  * The MMC tx interrupts are masked out as per the mask specified.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] tx interrupt bit mask for which interrupts needs to be disabled.
  * \return returns void.
  */
void synopGMAC_disable_mmc_tx_interrupt(synopGMACdevice *gmacdev, u32 mask)
{
    synopGMACSetBits(gmacdev->MacBase, GmacMmcIntrMaskTx, mask);
    return;
}
/**
  * Enable the MMC Tx interrupt.
  * The MMC tx interrupts are enabled as per the mask specified.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] tx interrupt bit mask for which interrupts needs to be enabled.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_enable_mmc_tx_interrupt(synopGMACdevice *gmacdev, u32 mask)
{
    synopGMACClearBits(gmacdev->MacBase, GmacMmcIntrMaskTx, mask);
}
#endif
/**
  * Disable the MMC Rx interrupt.
  * The MMC rx interrupts are masked out as per the mask specified.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] rx interrupt bit mask for which interrupts needs to be disabled.
  * \return returns void.
  */
void synopGMAC_disable_mmc_rx_interrupt(synopGMACdevice *gmacdev, u32 mask)
{
    synopGMACSetBits(gmacdev->MacBase, GmacMmcIntrMaskRx, mask);
    return;
}
/**
  * Enable the MMC Rx interrupt.
  * The MMC rx interrupts are enabled as per the mask specified.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] rx interrupt bit mask for which interrupts needs to be enabled.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_enable_mmc_rx_interrupt(synopGMACdevice *gmacdev, u32 mask)
{
    synopGMACClearBits(gmacdev->MacBase, GmacMmcIntrMaskRx, mask);
    return;
}
#endif
/**
  * Disable the MMC ipc rx checksum offload interrupt.
  * The MMC ipc rx checksum offload interrupts are masked out as per the mask specified.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] rx interrupt bit mask for which interrupts needs to be disabled.
  * \return returns void.
  */
void synopGMAC_disable_mmc_ipc_rx_interrupt(synopGMACdevice *gmacdev, u32 mask)
{
    synopGMACSetBits(gmacdev->MacBase, GmacMmcRxIpcIntrMask, mask);
    return;
}
/**
  * Enable the MMC ipc rx checksum offload interrupt.
  * The MMC ipc rx checksum offload interrupts are enabled as per the mask specified.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] rx interrupt bit mask for which interrupts needs to be enabled.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_enable_mmc_ipc_rx_interrupt(synopGMACdevice *gmacdev, u32 mask)
{
    synopGMACClearBits(gmacdev->MacBase, GmacMmcRxIpcIntrMask, mask);
    return;
}
#endif
/*******************MMC APIs***************************************/
/*******************Ip checksum offloading APIs***************************************/

/**
  * Enables the ip checksum offloading in receive path.
  * When set GMAC calculates 16 bit 1's complement of all received ethernet frame payload.
  * It also checks IPv4 Header checksum is correct. GMAC core appends the 16 bit checksum calculated
  * for payload of IP datagram and appends it to Ethernet frame transferred to the application.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
#if UNUSED
void synopGMAC_enable_rx_chksum_offload(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacConfig, GmacRxIpcOffload);
    return;
}
/**
  * Disable the ip checksum offloading in receive path.
  * Ip checksum offloading is disabled in the receive path.
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_disable_rx_Ipchecksum_offload(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->MacBase, GmacConfig, GmacRxIpcOffload);
}
/**
  * Instruct the DMA to drop the packets fails tcp ip checksum.
  * This is to instruct the receive DMA engine to drop the recevied packet if they
  * fails the tcp/ip checksum in hardware. Valid only when full checksum offloading is enabled(type-2).
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_rx_tcpip_chksum_drop_enable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->DmaBase, DmaControl, DmaDisableDropTcpCs);
    return;
}
/**
  * Instruct the DMA not to drop the packets even if it fails tcp ip checksum.
  * This is to instruct the receive DMA engine to allow the packets even if recevied packet
  * fails the tcp/ip checksum in hardware. Valid only when full checksum offloading is enabled(type-2).
  * @param[in] pointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_rx_tcpip_chksum_drop_disable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->DmaBase, DmaControl, DmaDisableDropTcpCs);
    return;
}
#endif

/**
  * When the Enhanced Descriptor is enabled then the bit 0 of RDES0 indicates whether the
  * Extended Status is available (RDES4). Time Stamp feature and the Checksum Offload Engine2
  * makes use of this extended status to provide the status of the received packet.
  * @param[in] pointer to synopGMACdevice
  * \return returns TRUE or FALSE
  */
#ifdef ENH_DESC_8W
/**
  * This function indicates whether extended status is available in the RDES0.
  * Any function which accesses the fields of extended status register must ensure a check on this has been made
  * This is valid only for Enhanced Descriptor.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] u32 status field of the corresponding descriptor.
  * \return returns TRUE or FALSE.
  */
bool synopGMAC_is_ext_status(synopGMACdevice *gmacdev, u32 status)              // extended status present indicates that the RDES4 need to be probed
{
    return ((status & DescRxEXTsts) != 0);  // if extstatus set then it returns 1
}
/**
  * This function returns true if the IP header checksum bit is set in the extended status.
  * Valid only when enhaced status available is set in RDES0 bit 0.
  * This is valid only for Enhanced Descriptor.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] u32 status field of the corresponding descriptor.
  * \return returns TRUE or FALSE.
  */
bool synopGMAC_ES_is_IP_header_error(synopGMACdevice *gmacdev, u32 ext_status)         // IP header (IPV4) checksum error
{
    return ((ext_status & DescRxIpHeaderError) != 0); // if IPV4 header error return 1
}
/**
  * This function returns true if the Checksum is bypassed in the hardware.
  * Valid only when enhaced status available is set in RDES0 bit 0.
  * This is valid only for Enhanced Descriptor.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] u32 status field of the corresponding descriptor.
  * \return returns TRUE or FALSE.
  */
bool synopGMAC_ES_is_rx_checksum_bypassed(synopGMACdevice *gmacdev, u32 ext_status)    // Hardware engine bypassed the checksum computation/checking
{
    return ((ext_status & DescRxChkSumBypass) != 0);  // if checksum offloading bypassed return 1
}
/**
  * This function returns true if payload checksum error is set in the extended status.
  * Valid only when enhaced status available is set in RDES0 bit 0.
  * This is valid only for Enhanced Descriptor.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] u32 status field of the corresponding descriptor.
  * \return returns TRUE or FALSE.
  */
bool synopGMAC_ES_is_IP_payload_error(synopGMACdevice *gmacdev, u32 ext_status)        // IP payload checksum is in error (UDP/TCP/ICMP checksum error)
{
    return ((ext_status & DescRxIpPayloadError) != 0); // if IP payload error return 1
}
#endif

/**
  * Decodes the Rx Descriptor status to various checksum error conditions.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] u32 status field of the corresponding descriptor.
  * \return returns decoded enum (u32) indicating the status.
  */
u32 synopGMAC_is_rx_checksum_error(synopGMACdevice *gmacdev, u32 status)
{
    if (((status & DescRxChkBit5) == 0) && ((status & DescRxChkBit7) == 0) && ((status & DescRxChkBit0) == 0))
        return RxLenLT600;
    else if (((status & DescRxChkBit5) == 0) && ((status & DescRxChkBit7) == 0) && ((status & DescRxChkBit0) != 0))
        return RxIpHdrPayLoadChkBypass;
    else if (((status & DescRxChkBit5) == 0) && ((status & DescRxChkBit7) != 0) && ((status & DescRxChkBit0) != 0))
        return RxChkBypass;
    else if (((status & DescRxChkBit5) != 0) && ((status & DescRxChkBit7) == 0) && ((status & DescRxChkBit0) == 0))
        return RxNoChkError;
    else if (((status & DescRxChkBit5) != 0) && ((status & DescRxChkBit7) == 0) && ((status & DescRxChkBit0) != 0))
        return RxPayLoadChkError;
    else if (((status & DescRxChkBit5) != 0) && ((status & DescRxChkBit7) != 0) && ((status & DescRxChkBit0) == 0))
        return RxIpHdrChkError;
    else if (((status & DescRxChkBit5) != 0) && ((status & DescRxChkBit7) != 0) && ((status & DescRxChkBit0) != 0))
        return RxIpHdrPayLoadChkError;
    else
        return RxIpHdrPayLoadRes;
}
/**
  * Checks if any Ipv4 header checksum error in the frame just transmitted.
  * This serves as indication that error occureed in the IPv4 header checksum insertion.
  * The sent out frame doesnot carry any ipv4 header checksum inserted by the hardware.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] u32 status field of the corresponding descriptor.
  * \return returns true if error in ipv4 header checksum, else returns false.
  */
bool synopGMAC_is_tx_ipv4header_checksum_error(synopGMACdevice *gmacdev, u32 status)
{
    return ((status & DescTxIpv4ChkError) == DescTxIpv4ChkError);
}

/**
  * Checks if any payload checksum error in the frame just transmitted.
  * This serves as indication that error occureed in the payload checksum insertion.
  * The sent out frame doesnot carry any payload checksum inserted by the hardware.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] u32 status field of the corresponding descriptor.
  * \return returns true if error in ipv4 header checksum, else returns false.
  */
bool synopGMAC_is_tx_payload_checksum_error(synopGMACdevice *gmacdev, u32 status)
{
    return ((status & DescTxPayChkError) == DescTxPayChkError);
}
/**
  * The check summ offload engine is bypassed in the tx path.
  * Checksum is not computed in the Hardware.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] Pointer to tx descriptor for which  ointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_tx_checksum_offload_bypass(synopGMACdevice *gmacdev, DmaDesc *desc)
{
#ifdef ENH_DESC
    desc->status = (desc->length & (~DescTxCisMask));//ENH_DESC
#else
    desc->length = (desc->length & (~DescTxCisMask));
#endif
}
/**
  * The check summ offload engine is enabled to do only IPV4 header checksum.
  * IPV4 header Checksum is computed in the Hardware.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] Pointer to tx descriptor for which  ointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_tx_checksum_offload_ipv4hdr(synopGMACdevice *gmacdev, DmaDesc *desc)
{
#ifdef ENH_DESC
    desc->status = ((desc->status & (~DescTxCisMask)) | DescTxCisIpv4HdrCs);//ENH_DESC
#else
    desc->length = ((desc->length & (~DescTxCisMask)) | DescTxCisIpv4HdrCs);
#endif
}

/**
  * The check summ offload engine is enabled to do TCPIP checsum assuming Pseudo header is available.
  * Hardware computes the tcp ip checksum assuming pseudo header checksum is computed in software.
  * Ipv4 header checksum is also inserted.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] Pointer to tx descriptor for which  ointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_tx_checksum_offload_tcponly(synopGMACdevice *gmacdev, DmaDesc *desc)
{
#ifdef ENH_DESC
    desc->status = ((desc->status & (~DescTxCisMask)) | DescTxCisTcpOnlyCs);//ENH_DESC
#else
    desc->length = ((desc->length & (~DescTxCisMask)) | DescTxCisTcpOnlyCs);
#endif
}
/**
  * The check summ offload engine is enabled to do complete checksum computation.
  * Hardware computes the tcp ip checksum including the pseudo header checksum.
  * Here the tcp payload checksum field should be set to 0000.
  * Ipv4 header checksum is also inserted.
  * @param[in] pointer to synopGMACdevice.
  * @param[in] Pointer to tx descriptor for which  ointer to synopGMACdevice.
  * \return returns void.
  */
void synopGMAC_tx_checksum_offload_tcp_pseudo(synopGMACdevice *gmacdev, DmaDesc *desc)
{
#ifdef ENH_DESC
    desc->status = ((desc->length & (~DescTxCisMask)) | DescTxCisTcpPseudoCs);
#else
    desc->length = ((desc->length & (~DescTxCisMask)) | DescTxCisTcpPseudoCs);
#endif

}
/*******************Ip checksum offloading APIs***************************************/
/*******************IEEE 1588 Timestamping API***************************************/
/*
 * At this time the driver supports the IEEE time stamping feature when the Enhanced Descriptors are enabled.
 * For normal descriptor and the IEEE time stamp (version 1), driver support is not proviced
 * Please make sure you have enabled the Advanced timestamp feature in the hardware and the driver should
 * be compiled with the ADV_TME_STAMP feature.
 * Some of the APIs provided here may not be valid for all configurations. Please make sure you call the
 * API with due care.
 */

/**
  * This function enables the timestamping. This enables the timestamping for transmit and receive frames.
  * When disabled timestamp is not added to tx and receive frames and timestamp generator is suspended.
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
#if UNUSED
void synopGMAC_TS_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacTSControl, GmacTSENA);
    return;
}
/**
  * This function disables the timestamping.
  * When disabled timestamp is not added to tx and receive frames and timestamp generator is suspended.
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->MacBase, GmacInterruptMask, GmacTSIntMask);
    return;
}

/**
  * Enable the interrupt to get timestamping interrupt.
  * This enables the host to get the interrupt when (1) system time is greater or equal to the
  * target time high and low register or (2) there is a overflow in th esecond register.
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_int_enable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->MacBase, GmacInterruptMask, GmacPmtIntMask);
    return;
}

/**
  * Disable the interrupt to get timestamping interrupt.
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_int_disable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacInterruptMask, GmacPmtIntMask);
    return;
}

/**
  * Enable MAC address for PTP frame filtering.
  * When enabled, uses MAC address (apart from MAC address 0) to filter the PTP frames when
  * PTP is sent directly over Ethernet.
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_mac_addr_filt_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacTSControl, GmacTSENMACADDR);
    return;
}

/**
  * Disables MAC address for PTP frame filtering.
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_mac_addr_filt_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->MacBase, GmacTSControl, GmacTSENMACADDR);
    return;
}

/**
  * Selet the type of clock mode for PTP.
  * Please note to use one of the follwoing as the clk_type argument.
  * GmacTSOrdClk          = 0x00000000,         00=> Ordinary clock
  * GmacTSBouClk          = 0x00010000,         01=> Boundary clock
  * GmacTSEtoEClk          = 0x00020000,         10=> End-to-End transparent clock
  * GmacTSPtoPClk          = 0x00030000,         11=> P-to-P transparent clock
  * @param[in] pointer to synopGMACdevice
  * @param[in] u32 value representing one of the above clk value
  * \return returns void
  */
void synopGMAC_TS_set_clk_type(synopGMACdevice *gmacdev, u32 clk_type)
{
    u32 clkval;
    clkval = synopGMACReadReg(gmacdev->MacBase, GmacTSControl); //set the mdc clock to the user defined value
    clkval = clkval | clk_type;
    synopGMACWriteReg(gmacdev->MacBase, GmacTSControl, clkval);
    return;
}

/**
  * Enable Snapshot for messages relevant to Master.
  * When enabled, snapshot is taken for messages relevant to master mode only, else snapshot is taken for messages relevant
  * to slave node.
  * Valid only for Ordinary clock and Boundary clock
  * Reserved when "Advanced Time Stamp" is not selected
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_master_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacTSControl, GmacTSMSTRENA);
    return;
}
/**
  * Disable Snapshot for messages relevant to Master.
  * When disabled, snapshot is taken for messages relevant
  * to slave node.
  * Valid only for Ordinary clock and Boundary clock
  * Reserved when "Advanced Time Stamp" is not selected
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_master_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->MacBase, GmacTSControl, GmacTSMSTRENA);
    return;
}
/**
  * Enable Snapshot for Event messages.
  * When enabled, snapshot is taken for event messages only (SYNC, Delay_Req, Pdelay_Req or Pdelay_Resp)
  * When disabled, snapshot is taken for all messages except Announce, Management and Signaling.
  * Reserved when "Advanced Time Stamp" is not selected
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_event_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacTSControl, GmacTSEVNTENA);
    return;
}
/**
  * Disable Snapshot for Event messages.
  * When disabled, snapshot is taken for all messages except Announce, Management and Signaling.
  * Reserved when "Advanced Time Stamp" is not selected
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_event_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->MacBase, GmacTSControl, GmacTSEVNTENA);
    return;
}

/**
  * Enable time stamp snapshot for IPV4 frames.
  * When enabled, time stamp snapshot is taken for IPV4 frames
  * Reserved when "Advanced Time Stamp" is not selected
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_IPV4_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacTSControl, GmacTSIPV4ENA);
    return;
}
/**
  * Disable time stamp snapshot for IPV4 frames.
  * When disabled, time stamp snapshot is not taken for IPV4 frames
  * Reserved when "Advanced Time Stamp" is not selected
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_IPV4_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->MacBase, GmacTSControl, GmacTSIPV4ENA);
    return;
}                    // Only for "Advanced Time Stamp"
/**
  * Enable time stamp snapshot for IPV6 frames.
  * When enabled, time stamp snapshot is taken for IPV6 frames
  * Reserved when "Advanced Time Stamp" is not selected
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_IPV6_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacTSControl, GmacTSIPV6ENA);
    return;
}
/**
  * Disable time stamp snapshot for IPV6 frames.
  * When disabled, time stamp snapshot is not taken for IPV6 frames
  * Reserved when "Advanced Time Stamp" is not selected
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_IPV6_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->MacBase, GmacTSControl, GmacTSIPV6ENA);
    return;
}

/**
  * Enable time stamp snapshot for PTP over Ethernet frames.
  * When enabled, time stamp snapshot is taken for PTP over Ethernet frames
  * Reserved when "Advanced Time Stamp" is not selected
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_ptp_over_ethernet_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacTSControl, GmacTSIPENA);
    return;
}
/**
  * Disable time stamp snapshot for PTP over Ethernet frames.
  * When disabled, time stamp snapshot is not taken for PTP over Ethernet frames
  * Reserved when "Advanced Time Stamp" is not selected
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_ptp_over_ethernet_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->MacBase, GmacTSControl, GmacTSIPENA);
    return;
}

/**
  * Snoop PTP packet for version 2 format
  * When set the PTP packets are snooped using the version 2 format.
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_pkt_snoop_ver2(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacTSControl, GmacTSVER2ENA);
    return;
}
/**
  * Snoop PTP packet for version 2 format
  * When set the PTP packets are snooped using the version 2 format.
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_pkt_snoop_ver1(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->MacBase, GmacTSControl, GmacTSVER2ENA);
    return;
}

/**
  * Timestamp digital rollover
  * When set the timestamp low register rolls over after 0x3B9A_C9FF value.
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_digital_rollover_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacTSControl, GmacTSCTRLSSR);
    return;
}
/**
  * Timestamp binary rollover
  * When set the timestamp low register rolls over after 0x7FFF_FFFF value.
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_binary_rollover_enable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->MacBase, GmacTSControl, GmacTSCTRLSSR);
    return;
}
/**
  * Enable Time Stamp for All frames
  * When set the timestamp snap shot is enabled for all frames received by the core.
  * Reserved when "Advanced Time Stamp" is not selected
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_all_frames_enable(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacTSControl, GmacTSENALL);
    return;
}
/**
  * Disable Time Stamp for All frames
  * When reset the timestamp snap shot is not enabled for all frames received by the core.
  * Reserved when "Advanced Time Stamp" is not selected
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_all_frames_disable(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->MacBase, GmacTSControl, GmacTSENALL);
    return;
}
/**
  * Addend Register Update
  * This function loads the contents of Time stamp addend register with the supplied 32 value.
  * This is reserved function when only coarse correction option is selected
  * @param[in] pointer to synopGMACdevice
  * @param[in] 32 bit addend value
  * \return returns 0 for Success or else Failure
  */
s32 synopGMAC_TS_addend_update(synopGMACdevice *gmacdev, u32 addend_value)
{
    u32 loop_variable;
    synopGMACWriteReg(gmacdev->MacBase, GmacTSAddend, addend_value); // Load the addend_value in to Addend register
    for (loop_variable = 0; loop_variable < DEFAULT_LOOP_VARIABLE; loop_variable++) //Wait till the busy bit gets cleared with in a certain amount of time
    {
        if (!((synopGMACReadReg(gmacdev->MacBase, GmacTSControl)) & GmacTSADDREG)) // if it is cleared then break
        {
            break;
        }
        plat_delay(DEFAULT_DELAY_VARIABLE);
    }
    if (loop_variable < DEFAULT_LOOP_VARIABLE)
        synopGMACSetBits(gmacdev->MacBase, GmacTSControl, GmacTSADDREG);
    else
    {
        TR("Error::: The TSADDREG bit is not getting cleared !!!!!!\n");
        return -ESYNOPGMACPHYERR;
    }
    return -ESYNOPGMACNOERR;
}
/**
  * time stamp Update
  * This function updates (adds/subtracts) with the value specified in the Timestamp High Update and
  * Timestamp Low Update register.
  * @param[in] pointer to synopGMACdevice
  * @param[in] Timestamp High Update value
  * @param[in] Timestamp Low Update value
  * \return returns 0 for Success or else Failure
  */
s32 synopGMAC_TS_timestamp_update(synopGMACdevice *gmacdev, u32 high_value, u32 low_value)
{
    u32 loop_variable;
    synopGMACWriteReg(gmacdev->MacBase, GmacTSHighUpdate, high_value); // Load the high value to Timestamp High register
    synopGMACWriteReg(gmacdev->MacBase, GmacTSLowUpdate, low_value); // Load the high value to Timestamp High register
    for (loop_variable = 0; loop_variable < DEFAULT_LOOP_VARIABLE; loop_variable++) //Wait till the busy bit gets cleared with in a certain amount of time
    {
        if (!((synopGMACReadReg(gmacdev->MacBase, GmacTSControl)) & GmacTSUPDT)) // if it is cleared then break
        {
            break;
        }
        plat_delay(DEFAULT_DELAY_VARIABLE);
    }
    if (loop_variable < DEFAULT_LOOP_VARIABLE)
        synopGMACSetBits(gmacdev->MacBase, GmacTSControl, GmacTSUPDT);
    else
    {
        TR("Error::: The TSADDREG bit is not getting cleared !!!!!!\n");
        return -ESYNOPGMACPHYERR;
    }
    return -ESYNOPGMACNOERR;
}

/**
  * time stamp Initialize
  * This function Loads/Initializes h the value specified in the Timestamp High Update and
  * Timestamp Low Update register.
  * @param[in] pointer to synopGMACdevice
  * @param[in] Timestamp High Load value
  * @param[in] Timestamp Low Load value
  * \return returns 0 for Success or else Failure
  */
s32 synopGMAC_TS_timestamp_init(synopGMACdevice *gmacdev, u32 high_value, u32 low_value)
{
    u32 loop_variable;
    synopGMACWriteReg(gmacdev->MacBase, GmacTSHighUpdate, high_value); // Load the high value to Timestamp High register
    synopGMACWriteReg(gmacdev->MacBase, GmacTSLowUpdate, low_value); // Load the high value to Timestamp High register
    for (loop_variable = 0; loop_variable < DEFAULT_LOOP_VARIABLE; loop_variable++) //Wait till the busy bit gets cleared with in a certain amount of time
    {
        if (!((synopGMACReadReg(gmacdev->MacBase, GmacTSControl)) & GmacTSINT)) // if it is cleared then break
        {
            break;
        }
        plat_delay(DEFAULT_DELAY_VARIABLE);
    }
    if (loop_variable < DEFAULT_LOOP_VARIABLE)
        synopGMACSetBits(gmacdev->MacBase, GmacTSControl, GmacTSINT);
    else
    {
        TR("Error::: The TSADDREG bit is not getting cleared !!!!!!\n");
        return -ESYNOPGMACPHYERR;
    }
    return -ESYNOPGMACNOERR;
}

/**
  * Time Stamp Update Coarse
  * When reset the timestamp update is done using coarse method.
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_coarse_update(synopGMACdevice *gmacdev)
{
    synopGMACClearBits(gmacdev->MacBase, GmacTSControl, GmacTSCFUPDT);
    return;
}
/**
  * Time Stamp Update Fine
  * When reset the timestamp update is done using Fine method.
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_fine_update(synopGMACdevice *gmacdev)
{
    synopGMACSetBits(gmacdev->MacBase, GmacTSControl, GmacTSCFUPDT);
    return;
}

/**
  * Load the Sub Second Increment value in to Sub Second increment register
  * @param[in] pointer to synopGMACdevice
  * \return returns void
  */
void synopGMAC_TS_subsecond_init(synopGMACdevice *gmacdev, u32 sub_sec_inc_value)
{
    synopGMACWriteReg(gmacdev->MacBase, GmacTSSubSecIncr, (sub_sec_inc_value & GmacSSINCMsk));
    return;
}
/**
  * Reads the time stamp contents in to the respective pointers
  * These registers are readonly.
  * This function returns the 48 bit time stamp assuming Version 2 timestamp with higher word is selected.
  * @param[in] pointer to synopGMACdevice
  * @param[in] pointer to hold 16 higher bit second register contents
  * @param[in] pointer to hold 32 bit second register contents
  * @param[in] pointer to hold 32 bit subnanosecond register contents
  * \return returns void
  * \note Please note that since the atomic access to the timestamp registers is not possible,
  *  the contents read may be different from the actual time stamp.
  */
void synopGMAC_TS_read_timestamp(synopGMACdevice *gmacdev, u16 *higher_sec_val, u32 *sec_val, u32   *sub_sec_val)
{
    * higher_sec_val = (u16)(synopGMACReadReg(gmacdev->MacBase, GmacTSHighWord) & GmacTSHighWordMask);
    * sec_val        = synopGMACReadReg(gmacdev->MacBase, GmacTSHigh);
    * sub_sec_val    = synopGMACReadReg(gmacdev->MacBase, GmacTSLow);
    return;
}
/**
  * Loads the time stamp higher sec value from the value supplied
  * @param[in] pointer to synopGMACdevice
  * @param[in] 16 higher bit second register contents passed as 32 bit value
  * \return returns void
  */
void synopGMAC_TS_load_timestamp_higher_val(synopGMACdevice *gmacdev, u32 higher_sec_val)
{
    synopGMACWriteReg(gmacdev->MacBase, GmacTSHighWord, (higher_sec_val & GmacTSHighWordMask));
    return;
}
/**
  * Reads the time stamp higher sec value to respective pointers
  * @param[in] pointer to synopGMACdevice
  * @param[in] pointer to hold 16 higher bit second register contents
  * \return returns void
  */
void synopGMAC_TS_read_timestamp_higher_val(synopGMACdevice *gmacdev, u16 *higher_sec_val)
{
    * higher_sec_val = (u16)(synopGMACReadReg(gmacdev->MacBase, GmacTSHighWord) & GmacTSHighWordMask);
    return;
}
/**
  * Load the Target time stamp registers
  * This function Loads the target time stamp registers with the values proviced
  * @param[in] pointer to synopGMACdevice
  * @param[in] target Timestamp High value
  * @param[in] target Timestamp Low  value
  * \return returns 0 for Success or else Failure
  */
void synopGMAC_TS_load_target_timestamp(synopGMACdevice *gmacdev, u32 sec_val, u32 sub_sec_val)
{
    synopGMACWriteReg(gmacdev->MacBase, GmacTSTargetTimeHigh, sec_val);
    synopGMACWriteReg(gmacdev->MacBase, GmacTSTargetTimeLow, sub_sec_val);
    return;
}
/**
  * Reads the Target time stamp registers
  * This function Loads the target time stamp registers with the values proviced
  * @param[in] pointer to synopGMACdevice
  * @param[in] pointer to hold target Timestamp High value
  * @param[in] pointer to hold target Timestamp Low  value
  * \return returns 0 for Success or else Failure
  */
void synopGMAC_TS_read_target_timestamp(synopGMACdevice *gmacdev, u32 *sec_val, u32 *sub_sec_val)
{
    * sec_val     = synopGMACReadReg(gmacdev->MacBase, GmacTSTargetTimeHigh);
    * sub_sec_val = synopGMACReadReg(gmacdev->MacBase, GmacTSTargetTimeLow);
    return;
}
#endif