stmmac: add is_jumbo field to dma data

[mirror_ubuntu-bionic-kernel.git] / drivers / net / ethernet / amd / amd8111e.c

/* Advanced  Micro Devices Inc. AMD8111E Linux Network Driver
 * Copyright (C) 2004 Advanced Micro Devices
 *
 *
 * Copyright 2001,2002 Jeff Garzik <jgarzik@mandrakesoft.com> [ 8139cp.c,tg3.c ]
 * Copyright (C) 2001, 2002 David S. Miller (davem@redhat.com)[ tg3.c]
 * Copyright 1996-1999 Thomas Bogendoerfer [ pcnet32.c ]
 * Derived from the lance driver written 1993,1994,1995 by Donald Becker.
 * Copyright 1993 United States Government as represented by the
 *      Director, National Security Agency.[ pcnet32.c ]
 * Carsten Langgaard, carstenl@mips.com [ pcnet32.c ]
 * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.

Module Name:

        amd8111e.c

Abstract:

         AMD8111 based 10/100 Ethernet Controller Driver.

Environment:

        Kernel Mode

Revision History:
        3.0.0
           Initial Revision.
        3.0.1
         1. Dynamic interrupt coalescing.
         2. Removed prev_stats.
         3. MII support.
         4. Dynamic IPG support
        3.0.2  05/29/2003
         1. Bug fix: Fixed failure to send jumbo packets larger than 4k.
         2. Bug fix: Fixed VLAN support failure.
         3. Bug fix: Fixed receive interrupt coalescing bug.
         4. Dynamic IPG support is disabled by default.
        3.0.3 06/05/2003
         1. Bug fix: Fixed failure to close the interface if SMP is enabled.
        3.0.4 12/09/2003
         1. Added set_mac_address routine for bonding driver support.
         2. Tested the driver for bonding support
         3. Bug fix: Fixed mismach in actual receive buffer lenth and lenth
            indicated to the h/w.
         4. Modified amd8111e_rx() routine to receive all the received packets
            in the first interrupt.
         5. Bug fix: Corrected  rx_errors  reported in get_stats() function.
        3.0.5 03/22/2004
         1. Added NAPI support

*/


#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/compiler.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/if_vlan.h>
#include <linux/ctype.h>
#include <linux/crc32.h>
#include <linux/dma-mapping.h>

#include <asm/io.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>

#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
#define AMD8111E_VLAN_TAG_USED 1
#else
#define AMD8111E_VLAN_TAG_USED 0
#endif

#include "amd8111e.h"
#define MODULE_NAME     "amd8111e"
#define MODULE_VERS     "3.0.7"
MODULE_AUTHOR("Advanced Micro Devices, Inc.");
MODULE_DESCRIPTION ("AMD8111 based 10/100 Ethernet Controller. Driver Version "MODULE_VERS);
MODULE_LICENSE("GPL");
module_param_array(speed_duplex, int, NULL, 0);
MODULE_PARM_DESC(speed_duplex, "Set device speed and duplex modes, 0: Auto Negotiate, 1: 10Mbps Half Duplex, 2: 10Mbps Full Duplex, 3: 100Mbps Half Duplex, 4: 100Mbps Full Duplex");
module_param_array(coalesce, bool, NULL, 0);
MODULE_PARM_DESC(coalesce, "Enable or Disable interrupt coalescing, 1: Enable, 0: Disable");
module_param_array(dynamic_ipg, bool, NULL, 0);
MODULE_PARM_DESC(dynamic_ipg, "Enable or Disable dynamic IPG, 1: Enable, 0: Disable");

/* This function will read the PHY registers. */
static int amd8111e_read_phy(struct amd8111e_priv *lp,
                             int phy_id, int reg, u32 *val)
{
        void __iomem *mmio = lp->mmio;
        unsigned int reg_val;
        unsigned int repeat= REPEAT_CNT;

        reg_val = readl(mmio + PHY_ACCESS);
        while (reg_val & PHY_CMD_ACTIVE)
                reg_val = readl( mmio + PHY_ACCESS );

        writel( PHY_RD_CMD | ((phy_id & 0x1f) << 21) |
                           ((reg & 0x1f) << 16),  mmio +PHY_ACCESS);
        do{
                reg_val = readl(mmio + PHY_ACCESS);
                udelay(30);  /* It takes 30 us to read/write data */
        } while (--repeat && (reg_val & PHY_CMD_ACTIVE));
        if(reg_val & PHY_RD_ERR)
                goto err_phy_read;

        *val = reg_val & 0xffff;
        return 0;
err_phy_read:
        *val = 0;
        return -EINVAL;

}

/* This function will write into PHY registers. */
static int amd8111e_write_phy(struct amd8111e_priv *lp,
                              int phy_id, int reg, u32 val)
{
        unsigned int repeat = REPEAT_CNT;
        void __iomem *mmio = lp->mmio;
        unsigned int reg_val;

        reg_val = readl(mmio + PHY_ACCESS);
        while (reg_val & PHY_CMD_ACTIVE)
                reg_val = readl( mmio + PHY_ACCESS );

        writel( PHY_WR_CMD | ((phy_id & 0x1f) << 21) |
                           ((reg & 0x1f) << 16)|val, mmio + PHY_ACCESS);

        do{
                reg_val = readl(mmio + PHY_ACCESS);
                udelay(30);  /* It takes 30 us to read/write the data */
        } while (--repeat && (reg_val & PHY_CMD_ACTIVE));

        if(reg_val & PHY_RD_ERR)
                goto err_phy_write;

        return 0;

err_phy_write:
        return -EINVAL;

}

/* This is the mii register read function provided to the mii interface. */
static int amd8111e_mdio_read(struct net_device *dev, int phy_id, int reg_num)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        unsigned int reg_val;

        amd8111e_read_phy(lp,phy_id,reg_num,&reg_val);
        return reg_val;

}

/* This is the mii register write function provided to the mii interface. */
static void amd8111e_mdio_write(struct net_device *dev,
                                int phy_id, int reg_num, int val)
{
        struct amd8111e_priv *lp = netdev_priv(dev);

        amd8111e_write_phy(lp, phy_id, reg_num, val);
}

/* This function will set PHY speed. During initialization sets
 * the original speed to 100 full
 */
static void amd8111e_set_ext_phy(struct net_device *dev)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        u32 bmcr,advert,tmp;

        /* Determine mii register values to set the speed */
        advert = amd8111e_mdio_read(dev, lp->ext_phy_addr, MII_ADVERTISE);
        tmp = advert & ~(ADVERTISE_ALL | ADVERTISE_100BASE4);
        switch (lp->ext_phy_option){

                default:
                case SPEED_AUTONEG: /* advertise all values */
                        tmp |= ( ADVERTISE_10HALF|ADVERTISE_10FULL|
                                ADVERTISE_100HALF|ADVERTISE_100FULL) ;
                        break;
                case SPEED10_HALF:
                        tmp |= ADVERTISE_10HALF;
                        break;
                case SPEED10_FULL:
                        tmp |= ADVERTISE_10FULL;
                        break;
                case SPEED100_HALF:
                        tmp |= ADVERTISE_100HALF;
                        break;
                case SPEED100_FULL:
                        tmp |= ADVERTISE_100FULL;
                        break;
        }

        if(advert != tmp)
                amd8111e_mdio_write(dev, lp->ext_phy_addr, MII_ADVERTISE, tmp);
        /* Restart auto negotiation */
        bmcr = amd8111e_mdio_read(dev, lp->ext_phy_addr, MII_BMCR);
        bmcr |= (BMCR_ANENABLE | BMCR_ANRESTART);
        amd8111e_mdio_write(dev, lp->ext_phy_addr, MII_BMCR, bmcr);

}

/* This function will unmap skb->data space and will free
 * all transmit and receive skbuffs.
 */
static int amd8111e_free_skbs(struct net_device *dev)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        struct sk_buff *rx_skbuff;
        int i;

        /* Freeing transmit skbs */
        for(i = 0; i < NUM_TX_BUFFERS; i++){
                if(lp->tx_skbuff[i]){
                        pci_unmap_single(lp->pci_dev,lp->tx_dma_addr[i],                                        lp->tx_skbuff[i]->len,PCI_DMA_TODEVICE);
                        dev_kfree_skb (lp->tx_skbuff[i]);
                        lp->tx_skbuff[i] = NULL;
                        lp->tx_dma_addr[i] = 0;
                }
        }
        /* Freeing previously allocated receive buffers */
        for (i = 0; i < NUM_RX_BUFFERS; i++){
                rx_skbuff = lp->rx_skbuff[i];
                if(rx_skbuff != NULL){
                        pci_unmap_single(lp->pci_dev,lp->rx_dma_addr[i],
                                  lp->rx_buff_len - 2,PCI_DMA_FROMDEVICE);
                        dev_kfree_skb(lp->rx_skbuff[i]);
                        lp->rx_skbuff[i] = NULL;
                        lp->rx_dma_addr[i] = 0;
                }
        }

        return 0;
}

/* This will set the receive buffer length corresponding
 * to the mtu size of networkinterface.
 */
static inline void amd8111e_set_rx_buff_len(struct net_device *dev)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        unsigned int mtu = dev->mtu;

        if (mtu > ETH_DATA_LEN){
                /* MTU + ethernet header + FCS
                 * + optional VLAN tag + skb reserve space 2
                 */
                lp->rx_buff_len = mtu + ETH_HLEN + 10;
                lp->options |= OPTION_JUMBO_ENABLE;
        } else{
                lp->rx_buff_len = PKT_BUFF_SZ;
                lp->options &= ~OPTION_JUMBO_ENABLE;
        }
}

/* This function will free all the previously allocated buffers,
 * determine new receive buffer length  and will allocate new receive buffers.
 * This function also allocates and initializes both the transmitter
 * and receive hardware descriptors.
 */
static int amd8111e_init_ring(struct net_device *dev)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        int i;

        lp->rx_idx = lp->tx_idx = 0;
        lp->tx_complete_idx = 0;
        lp->tx_ring_idx = 0;


        if(lp->opened)
                /* Free previously allocated transmit and receive skbs */
                amd8111e_free_skbs(dev);

        else{
                 /* allocate the tx and rx descriptors */
                if((lp->tx_ring = pci_alloc_consistent(lp->pci_dev,
                        sizeof(struct amd8111e_tx_dr)*NUM_TX_RING_DR,
                        &lp->tx_ring_dma_addr)) == NULL)

                        goto err_no_mem;

                if((lp->rx_ring = pci_alloc_consistent(lp->pci_dev,
                        sizeof(struct amd8111e_rx_dr)*NUM_RX_RING_DR,
                        &lp->rx_ring_dma_addr)) == NULL)

                        goto err_free_tx_ring;

        }
        /* Set new receive buff size */
        amd8111e_set_rx_buff_len(dev);

        /* Allocating receive  skbs */
        for (i = 0; i < NUM_RX_BUFFERS; i++) {

                lp->rx_skbuff[i] = netdev_alloc_skb(dev, lp->rx_buff_len);
                if (!lp->rx_skbuff[i]) {
                                /* Release previos allocated skbs */
                                for(--i; i >= 0 ;i--)
                                        dev_kfree_skb(lp->rx_skbuff[i]);
                                goto err_free_rx_ring;
                }
                skb_reserve(lp->rx_skbuff[i],2);
        }
        /* Initilaizing receive descriptors */
        for (i = 0; i < NUM_RX_BUFFERS; i++) {
                lp->rx_dma_addr[i] = pci_map_single(lp->pci_dev,
                        lp->rx_skbuff[i]->data,lp->rx_buff_len-2, PCI_DMA_FROMDEVICE);

                lp->rx_ring[i].buff_phy_addr = cpu_to_le32(lp->rx_dma_addr[i]);
                lp->rx_ring[i].buff_count = cpu_to_le16(lp->rx_buff_len-2);
                wmb();
                lp->rx_ring[i].rx_flags = cpu_to_le16(OWN_BIT);
        }

        /* Initializing transmit descriptors */
        for (i = 0; i < NUM_TX_RING_DR; i++) {
                lp->tx_ring[i].buff_phy_addr = 0;
                lp->tx_ring[i].tx_flags = 0;
                lp->tx_ring[i].buff_count = 0;
        }

        return 0;

err_free_rx_ring:

        pci_free_consistent(lp->pci_dev,
                sizeof(struct amd8111e_rx_dr)*NUM_RX_RING_DR,lp->rx_ring,
                lp->rx_ring_dma_addr);

err_free_tx_ring:

        pci_free_consistent(lp->pci_dev,
                 sizeof(struct amd8111e_tx_dr)*NUM_TX_RING_DR,lp->tx_ring,
                 lp->tx_ring_dma_addr);

err_no_mem:
        return -ENOMEM;
}

/* This function will set the interrupt coalescing according
 * to the input arguments
 */
static int amd8111e_set_coalesce(struct net_device *dev, enum coal_mode cmod)
{
        unsigned int timeout;
        unsigned int event_count;

        struct amd8111e_priv *lp = netdev_priv(dev);
        void __iomem *mmio = lp->mmio;
        struct amd8111e_coalesce_conf *coal_conf = &lp->coal_conf;


        switch(cmod)
        {
                case RX_INTR_COAL :
                        timeout = coal_conf->rx_timeout;
                        event_count = coal_conf->rx_event_count;
                        if( timeout > MAX_TIMEOUT ||
                                        event_count > MAX_EVENT_COUNT )
                                return -EINVAL;

                        timeout = timeout * DELAY_TIMER_CONV;
                        writel(VAL0|STINTEN, mmio+INTEN0);
                        writel((u32)DLY_INT_A_R0|( event_count<< 16 )|timeout,
                                                        mmio+DLY_INT_A);
                        break;

                case TX_INTR_COAL :
                        timeout = coal_conf->tx_timeout;
                        event_count = coal_conf->tx_event_count;
                        if( timeout > MAX_TIMEOUT ||
                                        event_count > MAX_EVENT_COUNT )
                                return -EINVAL;


                        timeout = timeout * DELAY_TIMER_CONV;
                        writel(VAL0|STINTEN,mmio+INTEN0);
                        writel((u32)DLY_INT_B_T0|( event_count<< 16 )|timeout,
                                                         mmio+DLY_INT_B);
                        break;

                case DISABLE_COAL:
                        writel(0,mmio+STVAL);
                        writel(STINTEN, mmio+INTEN0);
                        writel(0, mmio +DLY_INT_B);
                        writel(0, mmio+DLY_INT_A);
                        break;
                 case ENABLE_COAL:
                       /* Start the timer */
                        writel((u32)SOFT_TIMER_FREQ, mmio+STVAL); /*  0.5 sec */
                        writel(VAL0|STINTEN, mmio+INTEN0);
                        break;
                default:
                        break;

   }
        return 0;

}

/* This function initializes the device registers  and starts the device. */
static int amd8111e_restart(struct net_device *dev)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        void __iomem *mmio = lp->mmio;
        int i,reg_val;

        /* stop the chip */
         writel(RUN, mmio + CMD0);

        if(amd8111e_init_ring(dev))
                return -ENOMEM;

        /* enable the port manager and set auto negotiation always */
        writel((u32) VAL1|EN_PMGR, mmio + CMD3 );
        writel((u32)XPHYANE|XPHYRST , mmio + CTRL2);

        amd8111e_set_ext_phy(dev);

        /* set control registers */
        reg_val = readl(mmio + CTRL1);
        reg_val &= ~XMTSP_MASK;
        writel( reg_val| XMTSP_128 | CACHE_ALIGN, mmio + CTRL1 );

        /* enable interrupt */
        writel( APINT5EN | APINT4EN | APINT3EN | APINT2EN | APINT1EN |
                APINT0EN | MIIPDTINTEN | MCCIINTEN | MCCINTEN | MREINTEN |
                SPNDINTEN | MPINTEN | SINTEN | STINTEN, mmio + INTEN0);

        writel(VAL3 | LCINTEN | VAL1 | TINTEN0 | VAL0 | RINTEN0, mmio + INTEN0);

        /* initialize tx and rx ring base addresses */
        writel((u32)lp->tx_ring_dma_addr,mmio + XMT_RING_BASE_ADDR0);
        writel((u32)lp->rx_ring_dma_addr,mmio+ RCV_RING_BASE_ADDR0);

        writew((u32)NUM_TX_RING_DR, mmio + XMT_RING_LEN0);
        writew((u16)NUM_RX_RING_DR, mmio + RCV_RING_LEN0);

        /* set default IPG to 96 */
        writew((u32)DEFAULT_IPG,mmio+IPG);
        writew((u32)(DEFAULT_IPG-IFS1_DELTA), mmio + IFS1);

        if(lp->options & OPTION_JUMBO_ENABLE){
                writel((u32)VAL2|JUMBO, mmio + CMD3);
                /* Reset REX_UFLO */
                writel( REX_UFLO, mmio + CMD2);
                /* Should not set REX_UFLO for jumbo frames */
                writel( VAL0 | APAD_XMT|REX_RTRY , mmio + CMD2);
        }else{
                writel( VAL0 | APAD_XMT | REX_RTRY|REX_UFLO, mmio + CMD2);
                writel((u32)JUMBO, mmio + CMD3);
        }

#if AMD8111E_VLAN_TAG_USED
        writel((u32) VAL2|VSIZE|VL_TAG_DEL, mmio + CMD3);
#endif
        writel( VAL0 | APAD_XMT | REX_RTRY, mmio + CMD2 );

        /* Setting the MAC address to the device */
        for (i = 0; i < ETH_ALEN; i++)
                writeb( dev->dev_addr[i], mmio + PADR + i );

        /* Enable interrupt coalesce */
        if(lp->options & OPTION_INTR_COAL_ENABLE){
                netdev_info(dev, "Interrupt Coalescing Enabled.\n");
                amd8111e_set_coalesce(dev,ENABLE_COAL);
        }

        /* set RUN bit to start the chip */
        writel(VAL2 | RDMD0, mmio + CMD0);
        writel(VAL0 | INTREN | RUN, mmio + CMD0);

        /* To avoid PCI posting bug */
        readl(mmio+CMD0);
        return 0;
}

/* This function clears necessary the device registers. */
static void amd8111e_init_hw_default(struct amd8111e_priv *lp)
{
        unsigned int reg_val;
        unsigned int logic_filter[2] ={0,};
        void __iomem *mmio = lp->mmio;


        /* stop the chip */
        writel(RUN, mmio + CMD0);

        /* AUTOPOLL0 Register *//*TBD default value is 8100 in FPS */
        writew( 0x8100 | lp->ext_phy_addr, mmio + AUTOPOLL0);

        /* Clear RCV_RING_BASE_ADDR */
        writel(0, mmio + RCV_RING_BASE_ADDR0);

        /* Clear XMT_RING_BASE_ADDR */
        writel(0, mmio + XMT_RING_BASE_ADDR0);
        writel(0, mmio + XMT_RING_BASE_ADDR1);
        writel(0, mmio + XMT_RING_BASE_ADDR2);
        writel(0, mmio + XMT_RING_BASE_ADDR3);

        /* Clear CMD0  */
        writel(CMD0_CLEAR,mmio + CMD0);

        /* Clear CMD2 */
        writel(CMD2_CLEAR, mmio +CMD2);

        /* Clear CMD7 */
        writel(CMD7_CLEAR , mmio + CMD7);

        /* Clear DLY_INT_A and DLY_INT_B */
        writel(0x0, mmio + DLY_INT_A);
        writel(0x0, mmio + DLY_INT_B);

        /* Clear FLOW_CONTROL */
        writel(0x0, mmio + FLOW_CONTROL);

        /* Clear INT0  write 1 to clear register */
        reg_val = readl(mmio + INT0);
        writel(reg_val, mmio + INT0);

        /* Clear STVAL */
        writel(0x0, mmio + STVAL);

        /* Clear INTEN0 */
        writel( INTEN0_CLEAR, mmio + INTEN0);

        /* Clear LADRF */
        writel(0x0 , mmio + LADRF);

        /* Set SRAM_SIZE & SRAM_BOUNDARY registers  */
        writel( 0x80010,mmio + SRAM_SIZE);

        /* Clear RCV_RING0_LEN */
        writel(0x0, mmio +  RCV_RING_LEN0);

        /* Clear XMT_RING0/1/2/3_LEN */
        writel(0x0, mmio +  XMT_RING_LEN0);
        writel(0x0, mmio +  XMT_RING_LEN1);
        writel(0x0, mmio +  XMT_RING_LEN2);
        writel(0x0, mmio +  XMT_RING_LEN3);

        /* Clear XMT_RING_LIMIT */
        writel(0x0, mmio + XMT_RING_LIMIT);

        /* Clear MIB */
        writew(MIB_CLEAR, mmio + MIB_ADDR);

        /* Clear LARF */
        amd8111e_writeq(*(u64 *)logic_filter, mmio + LADRF);

        /* SRAM_SIZE register */
        reg_val = readl(mmio + SRAM_SIZE);

        if(lp->options & OPTION_JUMBO_ENABLE)
                writel( VAL2|JUMBO, mmio + CMD3);
#if AMD8111E_VLAN_TAG_USED
        writel(VAL2|VSIZE|VL_TAG_DEL, mmio + CMD3 );
#endif
        /* Set default value to CTRL1 Register */
        writel(CTRL1_DEFAULT, mmio + CTRL1);

        /* To avoid PCI posting bug */
        readl(mmio + CMD2);

}

/* This function disables the interrupt and clears all the pending
 * interrupts in INT0
 */
static void amd8111e_disable_interrupt(struct amd8111e_priv *lp)
{
        u32 intr0;

        /* Disable interrupt */
        writel(INTREN, lp->mmio + CMD0);

        /* Clear INT0 */
        intr0 = readl(lp->mmio + INT0);
        writel(intr0, lp->mmio + INT0);

        /* To avoid PCI posting bug */
        readl(lp->mmio + INT0);

}

/* This function stops the chip. */
static void amd8111e_stop_chip(struct amd8111e_priv *lp)
{
        writel(RUN, lp->mmio + CMD0);

        /* To avoid PCI posting bug */
        readl(lp->mmio + CMD0);
}

/* This function frees the  transmiter and receiver descriptor rings. */
static void amd8111e_free_ring(struct amd8111e_priv *lp)
{
        /* Free transmit and receive descriptor rings */
        if(lp->rx_ring){
                pci_free_consistent(lp->pci_dev,
                        sizeof(struct amd8111e_rx_dr)*NUM_RX_RING_DR,
                        lp->rx_ring, lp->rx_ring_dma_addr);
                lp->rx_ring = NULL;
        }

        if(lp->tx_ring){
                pci_free_consistent(lp->pci_dev,
                        sizeof(struct amd8111e_tx_dr)*NUM_TX_RING_DR,
                        lp->tx_ring, lp->tx_ring_dma_addr);

                lp->tx_ring = NULL;
        }

}

/* This function will free all the transmit skbs that are actually
 * transmitted by the device. It will check the ownership of the
 * skb before freeing the skb.
 */
static int amd8111e_tx(struct net_device *dev)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        int tx_index = lp->tx_complete_idx & TX_RING_DR_MOD_MASK;
        int status;
        /* Complete all the transmit packet */
        while (lp->tx_complete_idx != lp->tx_idx){
                tx_index =  lp->tx_complete_idx & TX_RING_DR_MOD_MASK;
                status = le16_to_cpu(lp->tx_ring[tx_index].tx_flags);

                if(status & OWN_BIT)
                        break;  /* It still hasn't been Txed */

                lp->tx_ring[tx_index].buff_phy_addr = 0;

                /* We must free the original skb */
                if (lp->tx_skbuff[tx_index]) {
                        pci_unmap_single(lp->pci_dev, lp->tx_dma_addr[tx_index],
                                        lp->tx_skbuff[tx_index]->len,
                                        PCI_DMA_TODEVICE);
                        dev_kfree_skb_irq (lp->tx_skbuff[tx_index]);
                        lp->tx_skbuff[tx_index] = NULL;
                        lp->tx_dma_addr[tx_index] = 0;
                }
                lp->tx_complete_idx++;
                /*COAL update tx coalescing parameters */
                lp->coal_conf.tx_packets++;
                lp->coal_conf.tx_bytes +=
                        le16_to_cpu(lp->tx_ring[tx_index].buff_count);

                if (netif_queue_stopped(dev) &&
                        lp->tx_complete_idx > lp->tx_idx - NUM_TX_BUFFERS +2){
                        /* The ring is no longer full, clear tbusy. */
                        /* lp->tx_full = 0; */
                        netif_wake_queue (dev);
                }
        }
        return 0;
}

/* This function handles the driver receive operation in polling mode */
static int amd8111e_rx_poll(struct napi_struct *napi, int budget)
{
        struct amd8111e_priv *lp = container_of(napi, struct amd8111e_priv, napi);
        struct net_device *dev = lp->amd8111e_net_dev;
        int rx_index = lp->rx_idx & RX_RING_DR_MOD_MASK;
        void __iomem *mmio = lp->mmio;
        struct sk_buff *skb,*new_skb;
        int min_pkt_len, status;
        unsigned int intr0;
        int num_rx_pkt = 0;
        short pkt_len;
#if AMD8111E_VLAN_TAG_USED
        short vtag;
#endif
        int rx_pkt_limit = budget;
        unsigned long flags;

        if (rx_pkt_limit <= 0)
                goto rx_not_empty;

        do{
                /* process receive packets until we use the quota.
                 * If we own the next entry, it's a new packet. Send it up.
                 */
                while(1) {
                        status = le16_to_cpu(lp->rx_ring[rx_index].rx_flags);
                        if (status & OWN_BIT)
                                break;

                        /* There is a tricky error noted by John Murphy,
                         * <murf@perftech.com> to Russ Nelson: Even with
                         * full-sized * buffers it's possible for a
                         * jabber packet to use two buffers, with only
                         * the last correctly noting the error.
                         */
                        if(status & ERR_BIT) {
                                /* resetting flags */
                                lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
                                goto err_next_pkt;
                        }
                        /* check for STP and ENP */
                        if(!((status & STP_BIT) && (status & ENP_BIT))){
                                /* resetting flags */
                                lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
                                goto err_next_pkt;
                        }
                        pkt_len = le16_to_cpu(lp->rx_ring[rx_index].msg_count) - 4;

#if AMD8111E_VLAN_TAG_USED
                        vtag = status & TT_MASK;
                        /*MAC will strip vlan tag*/
                        if (vtag != 0)
                                min_pkt_len =MIN_PKT_LEN - 4;
                        else
#endif
                                min_pkt_len =MIN_PKT_LEN;

                        if (pkt_len < min_pkt_len) {
                                lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
                                lp->drv_rx_errors++;
                                goto err_next_pkt;
                        }
                        if(--rx_pkt_limit < 0)
                                goto rx_not_empty;
                        new_skb = netdev_alloc_skb(dev, lp->rx_buff_len);
                        if (!new_skb) {
                                /* if allocation fail,
                                 * ignore that pkt and go to next one
                                 */
                                lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
                                lp->drv_rx_errors++;
                                goto err_next_pkt;
                        }

                        skb_reserve(new_skb, 2);
                        skb = lp->rx_skbuff[rx_index];
                        pci_unmap_single(lp->pci_dev,lp->rx_dma_addr[rx_index],
                                         lp->rx_buff_len-2, PCI_DMA_FROMDEVICE);
                        skb_put(skb, pkt_len);
                        lp->rx_skbuff[rx_index] = new_skb;
                        lp->rx_dma_addr[rx_index] = pci_map_single(lp->pci_dev,
                                                                   new_skb->data,
                                                                   lp->rx_buff_len-2,
                                                                   PCI_DMA_FROMDEVICE);

                        skb->protocol = eth_type_trans(skb, dev);

#if AMD8111E_VLAN_TAG_USED
                        if (vtag == TT_VLAN_TAGGED){
                                u16 vlan_tag = le16_to_cpu(lp->rx_ring[rx_index].tag_ctrl_info);
                                __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag);
                        }
#endif
                        netif_receive_skb(skb);
                        /*COAL update rx coalescing parameters*/
                        lp->coal_conf.rx_packets++;
                        lp->coal_conf.rx_bytes += pkt_len;
                        num_rx_pkt++;

                err_next_pkt:
                        lp->rx_ring[rx_index].buff_phy_addr
                                = cpu_to_le32(lp->rx_dma_addr[rx_index]);
                        lp->rx_ring[rx_index].buff_count =
                                cpu_to_le16(lp->rx_buff_len-2);
                        wmb();
                        lp->rx_ring[rx_index].rx_flags |= cpu_to_le16(OWN_BIT);
                        rx_index = (++lp->rx_idx) & RX_RING_DR_MOD_MASK;
                }
                /* Check the interrupt status register for more packets in the
                 * mean time. Process them since we have not used up our quota.
                 */
                intr0 = readl(mmio + INT0);
                /*Ack receive packets */
                writel(intr0 & RINT0,mmio + INT0);

        } while(intr0 & RINT0);

        if (rx_pkt_limit > 0) {
                /* Receive descriptor is empty now */
                spin_lock_irqsave(&lp->lock, flags);
                __napi_complete(napi);
                writel(VAL0|RINTEN0, mmio + INTEN0);
                writel(VAL2 | RDMD0, mmio + CMD0);
                spin_unlock_irqrestore(&lp->lock, flags);
        }

rx_not_empty:
        return num_rx_pkt;
}

/* This function will indicate the link status to the kernel. */
static int amd8111e_link_change(struct net_device *dev)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        int status0,speed;

        /* read the link change */
        status0 = readl(lp->mmio + STAT0);

        if(status0 & LINK_STATS){
                if(status0 & AUTONEG_COMPLETE)
                        lp->link_config.autoneg = AUTONEG_ENABLE;
                else
                        lp->link_config.autoneg = AUTONEG_DISABLE;

                if(status0 & FULL_DPLX)
                        lp->link_config.duplex = DUPLEX_FULL;
                else
                        lp->link_config.duplex = DUPLEX_HALF;
                speed = (status0 & SPEED_MASK) >> 7;
                if(speed == PHY_SPEED_10)
                        lp->link_config.speed = SPEED_10;
                else if(speed == PHY_SPEED_100)
                        lp->link_config.speed = SPEED_100;

                netdev_info(dev, "Link is Up. Speed is %s Mbps %s Duplex\n",
                            (lp->link_config.speed == SPEED_100) ?
                                                        "100" : "10",
                            (lp->link_config.duplex == DUPLEX_FULL) ?
                                                        "Full" : "Half");

                netif_carrier_on(dev);
        }
        else{
                lp->link_config.speed = SPEED_INVALID;
                lp->link_config.duplex = DUPLEX_INVALID;
                lp->link_config.autoneg = AUTONEG_INVALID;
                netdev_info(dev, "Link is Down.\n");
                netif_carrier_off(dev);
        }

        return 0;
}

/* This function reads the mib counters. */
static int amd8111e_read_mib(void __iomem *mmio, u8 MIB_COUNTER)
{
        unsigned int  status;
        unsigned  int data;
        unsigned int repeat = REPEAT_CNT;

        writew( MIB_RD_CMD | MIB_COUNTER, mmio + MIB_ADDR);
        do {
                status = readw(mmio + MIB_ADDR);
                udelay(2);      /* controller takes MAX 2 us to get mib data */
        }
        while (--repeat && (status & MIB_CMD_ACTIVE));

        data = readl(mmio + MIB_DATA);
        return data;
}

/* This function reads the mib registers and returns the hardware statistics.
 * It updates previous internal driver statistics with new values.
 */
static struct net_device_stats *amd8111e_get_stats(struct net_device *dev)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        void __iomem *mmio = lp->mmio;
        unsigned long flags;
        struct net_device_stats *new_stats = &dev->stats;

        if (!lp->opened)
                return new_stats;
        spin_lock_irqsave (&lp->lock, flags);

        /* stats.rx_packets */
        new_stats->rx_packets = amd8111e_read_mib(mmio, rcv_broadcast_pkts)+
                                amd8111e_read_mib(mmio, rcv_multicast_pkts)+
                                amd8111e_read_mib(mmio, rcv_unicast_pkts);

        /* stats.tx_packets */
        new_stats->tx_packets = amd8111e_read_mib(mmio, xmt_packets);

        /*stats.rx_bytes */
        new_stats->rx_bytes = amd8111e_read_mib(mmio, rcv_octets);

        /* stats.tx_bytes */
        new_stats->tx_bytes = amd8111e_read_mib(mmio, xmt_octets);

        /* stats.rx_errors */
        /* hw errors + errors driver reported */
        new_stats->rx_errors = amd8111e_read_mib(mmio, rcv_undersize_pkts)+
                                amd8111e_read_mib(mmio, rcv_fragments)+
                                amd8111e_read_mib(mmio, rcv_jabbers)+
                                amd8111e_read_mib(mmio, rcv_alignment_errors)+
                                amd8111e_read_mib(mmio, rcv_fcs_errors)+
                                amd8111e_read_mib(mmio, rcv_miss_pkts)+
                                lp->drv_rx_errors;

        /* stats.tx_errors */
        new_stats->tx_errors = amd8111e_read_mib(mmio, xmt_underrun_pkts);

        /* stats.rx_dropped*/
        new_stats->rx_dropped = amd8111e_read_mib(mmio, rcv_miss_pkts);

        /* stats.tx_dropped*/
        new_stats->tx_dropped = amd8111e_read_mib(mmio,  xmt_underrun_pkts);

        /* stats.multicast*/
        new_stats->multicast = amd8111e_read_mib(mmio, rcv_multicast_pkts);

        /* stats.collisions*/
        new_stats->collisions = amd8111e_read_mib(mmio, xmt_collisions);

        /* stats.rx_length_errors*/
        new_stats->rx_length_errors =
                amd8111e_read_mib(mmio, rcv_undersize_pkts)+
                amd8111e_read_mib(mmio, rcv_oversize_pkts);

        /* stats.rx_over_errors*/
        new_stats->rx_over_errors = amd8111e_read_mib(mmio, rcv_miss_pkts);

        /* stats.rx_crc_errors*/
        new_stats->rx_crc_errors = amd8111e_read_mib(mmio, rcv_fcs_errors);

        /* stats.rx_frame_errors*/
        new_stats->rx_frame_errors =
                amd8111e_read_mib(mmio, rcv_alignment_errors);

        /* stats.rx_fifo_errors */
        new_stats->rx_fifo_errors = amd8111e_read_mib(mmio, rcv_miss_pkts);

        /* stats.rx_missed_errors */
        new_stats->rx_missed_errors = amd8111e_read_mib(mmio, rcv_miss_pkts);

        /* stats.tx_aborted_errors*/
        new_stats->tx_aborted_errors =
                amd8111e_read_mib(mmio, xmt_excessive_collision);

        /* stats.tx_carrier_errors*/
        new_stats->tx_carrier_errors =
                amd8111e_read_mib(mmio, xmt_loss_carrier);

        /* stats.tx_fifo_errors*/
        new_stats->tx_fifo_errors = amd8111e_read_mib(mmio, xmt_underrun_pkts);

        /* stats.tx_window_errors*/
        new_stats->tx_window_errors =
                amd8111e_read_mib(mmio, xmt_late_collision);

        /* Reset the mibs for collecting new statistics */
        /* writew(MIB_CLEAR, mmio + MIB_ADDR);*/

        spin_unlock_irqrestore (&lp->lock, flags);

        return new_stats;
}

/* This function recalculate the interrupt coalescing  mode on every interrupt
 * according to the datarate and the packet rate.
 */
static int amd8111e_calc_coalesce(struct net_device *dev)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        struct amd8111e_coalesce_conf *coal_conf = &lp->coal_conf;
        int tx_pkt_rate;
        int rx_pkt_rate;
        int tx_data_rate;
        int rx_data_rate;
        int rx_pkt_size;
        int tx_pkt_size;

        tx_pkt_rate = coal_conf->tx_packets - coal_conf->tx_prev_packets;
        coal_conf->tx_prev_packets =  coal_conf->tx_packets;

        tx_data_rate = coal_conf->tx_bytes - coal_conf->tx_prev_bytes;
        coal_conf->tx_prev_bytes =  coal_conf->tx_bytes;

        rx_pkt_rate = coal_conf->rx_packets - coal_conf->rx_prev_packets;
        coal_conf->rx_prev_packets =  coal_conf->rx_packets;

        rx_data_rate = coal_conf->rx_bytes - coal_conf->rx_prev_bytes;
        coal_conf->rx_prev_bytes =  coal_conf->rx_bytes;

        if(rx_pkt_rate < 800){
                if(coal_conf->rx_coal_type != NO_COALESCE){

                        coal_conf->rx_timeout = 0x0;
                        coal_conf->rx_event_count = 0;
                        amd8111e_set_coalesce(dev,RX_INTR_COAL);
                        coal_conf->rx_coal_type = NO_COALESCE;
                }
        }
        else{

                rx_pkt_size = rx_data_rate/rx_pkt_rate;
                if (rx_pkt_size < 128){
                        if(coal_conf->rx_coal_type != NO_COALESCE){

                                coal_conf->rx_timeout = 0;
                                coal_conf->rx_event_count = 0;
                                amd8111e_set_coalesce(dev,RX_INTR_COAL);
                                coal_conf->rx_coal_type = NO_COALESCE;
                        }

                }
                else if ( (rx_pkt_size >= 128) && (rx_pkt_size < 512) ){

                        if(coal_conf->rx_coal_type !=  LOW_COALESCE){
                                coal_conf->rx_timeout = 1;
                                coal_conf->rx_event_count = 4;
                                amd8111e_set_coalesce(dev,RX_INTR_COAL);
                                coal_conf->rx_coal_type = LOW_COALESCE;
                        }
                }
                else if ((rx_pkt_size >= 512) && (rx_pkt_size < 1024)){

                        if(coal_conf->rx_coal_type !=  MEDIUM_COALESCE){
                                coal_conf->rx_timeout = 1;
                                coal_conf->rx_event_count = 4;
                                amd8111e_set_coalesce(dev,RX_INTR_COAL);
                                coal_conf->rx_coal_type = MEDIUM_COALESCE;
                        }

                }
                else if(rx_pkt_size >= 1024){
                        if(coal_conf->rx_coal_type !=  HIGH_COALESCE){
                                coal_conf->rx_timeout = 2;
                                coal_conf->rx_event_count = 3;
                                amd8111e_set_coalesce(dev,RX_INTR_COAL);
                                coal_conf->rx_coal_type = HIGH_COALESCE;
                        }
                }
        }
        /* NOW FOR TX INTR COALESC */
        if(tx_pkt_rate < 800){
                if(coal_conf->tx_coal_type != NO_COALESCE){

                        coal_conf->tx_timeout = 0x0;
                        coal_conf->tx_event_count = 0;
                        amd8111e_set_coalesce(dev,TX_INTR_COAL);
                        coal_conf->tx_coal_type = NO_COALESCE;
                }
        }
        else{

                tx_pkt_size = tx_data_rate/tx_pkt_rate;
                if (tx_pkt_size < 128){

                        if(coal_conf->tx_coal_type != NO_COALESCE){

                                coal_conf->tx_timeout = 0;
                                coal_conf->tx_event_count = 0;
                                amd8111e_set_coalesce(dev,TX_INTR_COAL);
                                coal_conf->tx_coal_type = NO_COALESCE;
                        }

                }
                else if ( (tx_pkt_size >= 128) && (tx_pkt_size < 512) ){

                        if(coal_conf->tx_coal_type !=  LOW_COALESCE){
                                coal_conf->tx_timeout = 1;
                                coal_conf->tx_event_count = 2;
                                amd8111e_set_coalesce(dev,TX_INTR_COAL);
                                coal_conf->tx_coal_type = LOW_COALESCE;

                        }
                }
                else if ((tx_pkt_size >= 512) && (tx_pkt_size < 1024)){

                        if(coal_conf->tx_coal_type !=  MEDIUM_COALESCE){
                                coal_conf->tx_timeout = 2;
                                coal_conf->tx_event_count = 5;
                                amd8111e_set_coalesce(dev,TX_INTR_COAL);
                                coal_conf->tx_coal_type = MEDIUM_COALESCE;
                        }

                }
                else if(tx_pkt_size >= 1024){
                        if (tx_pkt_size >= 1024){
                                if(coal_conf->tx_coal_type !=  HIGH_COALESCE){
                                        coal_conf->tx_timeout = 4;
                                        coal_conf->tx_event_count = 8;
                                        amd8111e_set_coalesce(dev,TX_INTR_COAL);
                                        coal_conf->tx_coal_type = HIGH_COALESCE;
                                }
                        }
                }
        }
        return 0;

}

/* This is device interrupt function. It handles transmit,
 * receive,link change and hardware timer interrupts.
 */
static irqreturn_t amd8111e_interrupt(int irq, void *dev_id)
{

        struct net_device *dev = (struct net_device *)dev_id;
        struct amd8111e_priv *lp = netdev_priv(dev);
        void __iomem *mmio = lp->mmio;
        unsigned int intr0, intren0;
        unsigned int handled = 1;

        if(unlikely(dev == NULL))
                return IRQ_NONE;

        spin_lock(&lp->lock);

        /* disabling interrupt */
        writel(INTREN, mmio + CMD0);

        /* Read interrupt status */
        intr0 = readl(mmio + INT0);
        intren0 = readl(mmio + INTEN0);

        /* Process all the INT event until INTR bit is clear. */

        if (!(intr0 & INTR)){
                handled = 0;
                goto err_no_interrupt;
        }

        /* Current driver processes 4 interrupts : RINT,TINT,LCINT,STINT */
        writel(intr0, mmio + INT0);

        /* Check if Receive Interrupt has occurred. */
        if (intr0 & RINT0) {
                if (napi_schedule_prep(&lp->napi)) {
                        /* Disable receive interupts */
                        writel(RINTEN0, mmio + INTEN0);
                        /* Schedule a polling routine */
                        __napi_schedule(&lp->napi);
                } else if (intren0 & RINTEN0) {
                        netdev_dbg(dev, "************Driver bug! interrupt while in poll\n");
                        /* Fix by disable receive interrupts */
                        writel(RINTEN0, mmio + INTEN0);
                }
        }

        /* Check if  Transmit Interrupt has occurred. */
        if (intr0 & TINT0)
                amd8111e_tx(dev);

        /* Check if  Link Change Interrupt has occurred. */
        if (intr0 & LCINT)
                amd8111e_link_change(dev);

        /* Check if Hardware Timer Interrupt has occurred. */
        if (intr0 & STINT)
                amd8111e_calc_coalesce(dev);

err_no_interrupt:
        writel( VAL0 | INTREN,mmio + CMD0);

        spin_unlock(&lp->lock);

        return IRQ_RETVAL(handled);
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void amd8111e_poll(struct net_device *dev)
{
        unsigned long flags;
        local_irq_save(flags);
        amd8111e_interrupt(0, dev);
        local_irq_restore(flags);
}
#endif


/* This function closes the network interface and updates
 * the statistics so that most recent statistics will be
 * available after the interface is down.
 */
static int amd8111e_close(struct net_device *dev)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        netif_stop_queue(dev);

        napi_disable(&lp->napi);

        spin_lock_irq(&lp->lock);

        amd8111e_disable_interrupt(lp);
        amd8111e_stop_chip(lp);

        /* Free transmit and receive skbs */
        amd8111e_free_skbs(lp->amd8111e_net_dev);

        netif_carrier_off(lp->amd8111e_net_dev);

        /* Delete ipg timer */
        if(lp->options & OPTION_DYN_IPG_ENABLE)
                del_timer_sync(&lp->ipg_data.ipg_timer);

        spin_unlock_irq(&lp->lock);
        free_irq(dev->irq, dev);
        amd8111e_free_ring(lp);

        /* Update the statistics before closing */
        amd8111e_get_stats(dev);
        lp->opened = 0;
        return 0;
}

/* This function opens new interface.It requests irq for the device,
 * initializes the device,buffers and descriptors, and starts the device.
 */
static int amd8111e_open(struct net_device *dev)
{
        struct amd8111e_priv *lp = netdev_priv(dev);

        if(dev->irq ==0 || request_irq(dev->irq, amd8111e_interrupt, IRQF_SHARED,
                                         dev->name, dev))
                return -EAGAIN;

        napi_enable(&lp->napi);

        spin_lock_irq(&lp->lock);

        amd8111e_init_hw_default(lp);

        if(amd8111e_restart(dev)){
                spin_unlock_irq(&lp->lock);
                napi_disable(&lp->napi);
                if (dev->irq)
                        free_irq(dev->irq, dev);
                return -ENOMEM;
        }
        /* Start ipg timer */
        if(lp->options & OPTION_DYN_IPG_ENABLE){
                add_timer(&lp->ipg_data.ipg_timer);
                netdev_info(dev, "Dynamic IPG Enabled\n");
        }

        lp->opened = 1;

        spin_unlock_irq(&lp->lock);

        netif_start_queue(dev);

        return 0;
}

/* This function checks if there is any transmit  descriptors
 * available to queue more packet.
 */
static int amd8111e_tx_queue_avail(struct amd8111e_priv *lp)
{
        int tx_index = lp->tx_idx & TX_BUFF_MOD_MASK;
        if (lp->tx_skbuff[tx_index])
                return -1;
        else
                return 0;

}

/* This function will queue the transmit packets to the
 * descriptors and will trigger the send operation. It also
 * initializes the transmit descriptors with buffer physical address,
 * byte count, ownership to hardware etc.
 */
static netdev_tx_t amd8111e_start_xmit(struct sk_buff *skb,
                                       struct net_device *dev)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        int tx_index;
        unsigned long flags;

        spin_lock_irqsave(&lp->lock, flags);

        tx_index = lp->tx_idx & TX_RING_DR_MOD_MASK;

        lp->tx_ring[tx_index].buff_count = cpu_to_le16(skb->len);

        lp->tx_skbuff[tx_index] = skb;
        lp->tx_ring[tx_index].tx_flags = 0;

#if AMD8111E_VLAN_TAG_USED
        if (skb_vlan_tag_present(skb)) {
                lp->tx_ring[tx_index].tag_ctrl_cmd |=
                                cpu_to_le16(TCC_VLAN_INSERT);
                lp->tx_ring[tx_index].tag_ctrl_info =
                                cpu_to_le16(skb_vlan_tag_get(skb));

        }
#endif
        lp->tx_dma_addr[tx_index] =
            pci_map_single(lp->pci_dev, skb->data, skb->len, PCI_DMA_TODEVICE);
        lp->tx_ring[tx_index].buff_phy_addr =
            cpu_to_le32(lp->tx_dma_addr[tx_index]);

        /*  Set FCS and LTINT bits */
        wmb();
        lp->tx_ring[tx_index].tx_flags |=
            cpu_to_le16(OWN_BIT | STP_BIT | ENP_BIT|ADD_FCS_BIT|LTINT_BIT);

        lp->tx_idx++;

        /* Trigger an immediate send poll. */
        writel( VAL1 | TDMD0, lp->mmio + CMD0);
        writel( VAL2 | RDMD0,lp->mmio + CMD0);

        if(amd8111e_tx_queue_avail(lp) < 0){
                netif_stop_queue(dev);
        }
        spin_unlock_irqrestore(&lp->lock, flags);
        return NETDEV_TX_OK;
}
/* This function returns all the memory mapped registers of the device. */
static void amd8111e_read_regs(struct amd8111e_priv *lp, u32 *buf)
{
        void __iomem *mmio = lp->mmio;
        /* Read only necessary registers */
        buf[0] = readl(mmio + XMT_RING_BASE_ADDR0);
        buf[1] = readl(mmio + XMT_RING_LEN0);
        buf[2] = readl(mmio + RCV_RING_BASE_ADDR0);
        buf[3] = readl(mmio + RCV_RING_LEN0);
        buf[4] = readl(mmio + CMD0);
        buf[5] = readl(mmio + CMD2);
        buf[6] = readl(mmio + CMD3);
        buf[7] = readl(mmio + CMD7);
        buf[8] = readl(mmio + INT0);
        buf[9] = readl(mmio + INTEN0);
        buf[10] = readl(mmio + LADRF);
        buf[11] = readl(mmio + LADRF+4);
        buf[12] = readl(mmio + STAT0);
}


/* This function sets promiscuos mode, all-multi mode or the multicast address
 * list to the device.
 */
static void amd8111e_set_multicast_list(struct net_device *dev)
{
        struct netdev_hw_addr *ha;
        struct amd8111e_priv *lp = netdev_priv(dev);
        u32 mc_filter[2] ;
        int bit_num;

        if(dev->flags & IFF_PROMISC){
                writel( VAL2 | PROM, lp->mmio + CMD2);
                return;
        }
        else
                writel( PROM, lp->mmio + CMD2);
        if (dev->flags & IFF_ALLMULTI ||
            netdev_mc_count(dev) > MAX_FILTER_SIZE) {
                /* get all multicast packet */
                mc_filter[1] = mc_filter[0] = 0xffffffff;
                lp->options |= OPTION_MULTICAST_ENABLE;
                amd8111e_writeq(*(u64 *)mc_filter, lp->mmio + LADRF);
                return;
        }
        if (netdev_mc_empty(dev)) {
                /* get only own packets */
                mc_filter[1] = mc_filter[0] = 0;
                lp->options &= ~OPTION_MULTICAST_ENABLE;
                amd8111e_writeq(*(u64 *)mc_filter, lp->mmio + LADRF);
                /* disable promiscuous mode */
                writel(PROM, lp->mmio + CMD2);
                return;
        }
        /* load all the multicast addresses in the logic filter */
        lp->options |= OPTION_MULTICAST_ENABLE;
        mc_filter[1] = mc_filter[0] = 0;
        netdev_for_each_mc_addr(ha, dev) {
                bit_num = (ether_crc_le(ETH_ALEN, ha->addr) >> 26) & 0x3f;
                mc_filter[bit_num >> 5] |= 1 << (bit_num & 31);
        }
        amd8111e_writeq(*(u64 *)mc_filter, lp->mmio + LADRF);

        /* To eliminate PCI posting bug */
        readl(lp->mmio + CMD2);

}

static void amd8111e_get_drvinfo(struct net_device *dev,
                                 struct ethtool_drvinfo *info)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        struct pci_dev *pci_dev = lp->pci_dev;
        strlcpy(info->driver, MODULE_NAME, sizeof(info->driver));
        strlcpy(info->version, MODULE_VERS, sizeof(info->version));
        snprintf(info->fw_version, sizeof(info->fw_version),
                "%u", chip_version);
        strlcpy(info->bus_info, pci_name(pci_dev), sizeof(info->bus_info));
}

static int amd8111e_get_regs_len(struct net_device *dev)
{
        return AMD8111E_REG_DUMP_LEN;
}

static void amd8111e_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *buf)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        regs->version = 0;
        amd8111e_read_regs(lp, buf);
}

static int amd8111e_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        spin_lock_irq(&lp->lock);
        mii_ethtool_gset(&lp->mii_if, ecmd);
        spin_unlock_irq(&lp->lock);
        return 0;
}

static int amd8111e_set_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        int res;
        spin_lock_irq(&lp->lock);
        res = mii_ethtool_sset(&lp->mii_if, ecmd);
        spin_unlock_irq(&lp->lock);
        return res;
}

static int amd8111e_nway_reset(struct net_device *dev)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        return mii_nway_restart(&lp->mii_if);
}

static u32 amd8111e_get_link(struct net_device *dev)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        return mii_link_ok(&lp->mii_if);
}

static void amd8111e_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol_info)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        wol_info->supported = WAKE_MAGIC|WAKE_PHY;
        if (lp->options & OPTION_WOL_ENABLE)
                wol_info->wolopts = WAKE_MAGIC;
}

static int amd8111e_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol_info)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        if (wol_info->wolopts & ~(WAKE_MAGIC|WAKE_PHY))
                return -EINVAL;
        spin_lock_irq(&lp->lock);
        if (wol_info->wolopts & WAKE_MAGIC)
                lp->options |=
                        (OPTION_WOL_ENABLE | OPTION_WAKE_MAGIC_ENABLE);
        else if(wol_info->wolopts & WAKE_PHY)
                lp->options |=
                        (OPTION_WOL_ENABLE | OPTION_WAKE_PHY_ENABLE);
        else
                lp->options &= ~OPTION_WOL_ENABLE;
        spin_unlock_irq(&lp->lock);
        return 0;
}

static const struct ethtool_ops ops = {
        .get_drvinfo = amd8111e_get_drvinfo,
        .get_regs_len = amd8111e_get_regs_len,
        .get_regs = amd8111e_get_regs,
        .get_settings = amd8111e_get_settings,
        .set_settings = amd8111e_set_settings,
        .nway_reset = amd8111e_nway_reset,
        .get_link = amd8111e_get_link,
        .get_wol = amd8111e_get_wol,
        .set_wol = amd8111e_set_wol,
};

/* This function handles all the  ethtool ioctls. It gives driver info,
 * gets/sets driver speed, gets memory mapped register values, forces
 * auto negotiation, sets/gets WOL options for ethtool application.
 */
static int amd8111e_ioctl(struct net_device *dev , struct ifreq *ifr, int cmd)
{
        struct mii_ioctl_data *data = if_mii(ifr);
        struct amd8111e_priv *lp = netdev_priv(dev);
        int err;
        u32 mii_regval;

        switch(cmd) {
        case SIOCGMIIPHY:
                data->phy_id = lp->ext_phy_addr;

        /* fallthru */
        case SIOCGMIIREG:

                spin_lock_irq(&lp->lock);
                err = amd8111e_read_phy(lp, data->phy_id,
                        data->reg_num & PHY_REG_ADDR_MASK, &mii_regval);
                spin_unlock_irq(&lp->lock);

                data->val_out = mii_regval;
                return err;

        case SIOCSMIIREG:

                spin_lock_irq(&lp->lock);
                err = amd8111e_write_phy(lp, data->phy_id,
                        data->reg_num & PHY_REG_ADDR_MASK, data->val_in);
                spin_unlock_irq(&lp->lock);

                return err;

        default:
                /* do nothing */
                break;
        }
        return -EOPNOTSUPP;
}
static int amd8111e_set_mac_address(struct net_device *dev, void *p)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        int i;
        struct sockaddr *addr = p;

        memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
        spin_lock_irq(&lp->lock);
        /* Setting the MAC address to the device */
        for (i = 0; i < ETH_ALEN; i++)
                writeb( dev->dev_addr[i], lp->mmio + PADR + i );

        spin_unlock_irq(&lp->lock);

        return 0;
}

/* This function changes the mtu of the device. It restarts the device  to
 * initialize the descriptor with new receive buffers.
 */
static int amd8111e_change_mtu(struct net_device *dev, int new_mtu)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        int err;

        if ((new_mtu < AMD8111E_MIN_MTU) || (new_mtu > AMD8111E_MAX_MTU))
                return -EINVAL;

        if (!netif_running(dev)) {
                /* new_mtu will be used
                 * when device starts netxt time
                 */
                dev->mtu = new_mtu;
                return 0;
        }

        spin_lock_irq(&lp->lock);

        /* stop the chip */
        writel(RUN, lp->mmio + CMD0);

        dev->mtu = new_mtu;

        err = amd8111e_restart(dev);
        spin_unlock_irq(&lp->lock);
        if(!err)
                netif_start_queue(dev);
        return err;
}

static int amd8111e_enable_magicpkt(struct amd8111e_priv *lp)
{
        writel( VAL1|MPPLBA, lp->mmio + CMD3);
        writel( VAL0|MPEN_SW, lp->mmio + CMD7);

        /* To eliminate PCI posting bug */
        readl(lp->mmio + CMD7);
        return 0;
}

static int amd8111e_enable_link_change(struct amd8111e_priv *lp)
{

        /* Adapter is already stoped/suspended/interrupt-disabled */
        writel(VAL0|LCMODE_SW,lp->mmio + CMD7);

        /* To eliminate PCI posting bug */
        readl(lp->mmio + CMD7);
        return 0;
}

/* This function is called when a packet transmission fails to complete
 * within a reasonable period, on the assumption that an interrupt have
 * failed or the interface is locked up. This function will reinitialize
 * the hardware.
 */
static void amd8111e_tx_timeout(struct net_device *dev)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        int err;

        netdev_err(dev, "transmit timed out, resetting\n");

        spin_lock_irq(&lp->lock);
        err = amd8111e_restart(dev);
        spin_unlock_irq(&lp->lock);
        if(!err)
                netif_wake_queue(dev);
}
static int amd8111e_suspend(struct pci_dev *pci_dev, pm_message_t state)
{
        struct net_device *dev = pci_get_drvdata(pci_dev);
        struct amd8111e_priv *lp = netdev_priv(dev);

        if (!netif_running(dev))
                return 0;

        /* disable the interrupt */
        spin_lock_irq(&lp->lock);
        amd8111e_disable_interrupt(lp);
        spin_unlock_irq(&lp->lock);

        netif_device_detach(dev);

        /* stop chip */
        spin_lock_irq(&lp->lock);
        if(lp->options & OPTION_DYN_IPG_ENABLE)
                del_timer_sync(&lp->ipg_data.ipg_timer);
        amd8111e_stop_chip(lp);
        spin_unlock_irq(&lp->lock);

        if(lp->options & OPTION_WOL_ENABLE){
                 /* enable wol */
                if(lp->options & OPTION_WAKE_MAGIC_ENABLE)
                        amd8111e_enable_magicpkt(lp);
                if(lp->options & OPTION_WAKE_PHY_ENABLE)
                        amd8111e_enable_link_change(lp);

                pci_enable_wake(pci_dev, PCI_D3hot, 1);
                pci_enable_wake(pci_dev, PCI_D3cold, 1);

        }
        else{
                pci_enable_wake(pci_dev, PCI_D3hot, 0);
                pci_enable_wake(pci_dev, PCI_D3cold, 0);
        }

        pci_save_state(pci_dev);
        pci_set_power_state(pci_dev, PCI_D3hot);

        return 0;
}
static int amd8111e_resume(struct pci_dev *pci_dev)
{
        struct net_device *dev = pci_get_drvdata(pci_dev);
        struct amd8111e_priv *lp = netdev_priv(dev);

        if (!netif_running(dev))
                return 0;

        pci_set_power_state(pci_dev, PCI_D0);
        pci_restore_state(pci_dev);

        pci_enable_wake(pci_dev, PCI_D3hot, 0);
        pci_enable_wake(pci_dev, PCI_D3cold, 0); /* D3 cold */

        netif_device_attach(dev);

        spin_lock_irq(&lp->lock);
        amd8111e_restart(dev);
        /* Restart ipg timer */
        if(lp->options & OPTION_DYN_IPG_ENABLE)
                mod_timer(&lp->ipg_data.ipg_timer,
                                jiffies + IPG_CONVERGE_JIFFIES);
        spin_unlock_irq(&lp->lock);

        return 0;
}

static void amd8111e_config_ipg(struct net_device *dev)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        struct ipg_info *ipg_data = &lp->ipg_data;
        void __iomem *mmio = lp->mmio;
        unsigned int prev_col_cnt = ipg_data->col_cnt;
        unsigned int total_col_cnt;
        unsigned int tmp_ipg;

        if(lp->link_config.duplex == DUPLEX_FULL){
                ipg_data->ipg = DEFAULT_IPG;
                return;
        }

        if(ipg_data->ipg_state == SSTATE){

                if(ipg_data->timer_tick == IPG_STABLE_TIME){

                        ipg_data->timer_tick = 0;
                        ipg_data->ipg = MIN_IPG - IPG_STEP;
                        ipg_data->current_ipg = MIN_IPG;
                        ipg_data->diff_col_cnt = 0xFFFFFFFF;
                        ipg_data->ipg_state = CSTATE;
                }
                else
                        ipg_data->timer_tick++;
        }

        if(ipg_data->ipg_state == CSTATE){

                /* Get the current collision count */

                total_col_cnt = ipg_data->col_cnt =
                                amd8111e_read_mib(mmio, xmt_collisions);

                if ((total_col_cnt - prev_col_cnt) <
                                (ipg_data->diff_col_cnt)){

                        ipg_data->diff_col_cnt =
                                total_col_cnt - prev_col_cnt ;

                        ipg_data->ipg = ipg_data->current_ipg;
                }

                ipg_data->current_ipg += IPG_STEP;

                if (ipg_data->current_ipg <= MAX_IPG)
                        tmp_ipg = ipg_data->current_ipg;
                else{
                        tmp_ipg = ipg_data->ipg;
                        ipg_data->ipg_state = SSTATE;
                }
                writew((u32)tmp_ipg, mmio + IPG);
                writew((u32)(tmp_ipg - IFS1_DELTA), mmio + IFS1);
        }
         mod_timer(&lp->ipg_data.ipg_timer, jiffies + IPG_CONVERGE_JIFFIES);
        return;

}

static void amd8111e_probe_ext_phy(struct net_device *dev)
{
        struct amd8111e_priv *lp = netdev_priv(dev);
        int i;

        for (i = 0x1e; i >= 0; i--) {
                u32 id1, id2;

                if (amd8111e_read_phy(lp, i, MII_PHYSID1, &id1))
                        continue;
                if (amd8111e_read_phy(lp, i, MII_PHYSID2, &id2))
                        continue;
                lp->ext_phy_id = (id1 << 16) | id2;
                lp->ext_phy_addr = i;
                return;
        }
        lp->ext_phy_id = 0;
        lp->ext_phy_addr = 1;
}

static const struct net_device_ops amd8111e_netdev_ops = {
        .ndo_open               = amd8111e_open,
        .ndo_stop               = amd8111e_close,
        .ndo_start_xmit         = amd8111e_start_xmit,
        .ndo_tx_timeout         = amd8111e_tx_timeout,
        .ndo_get_stats          = amd8111e_get_stats,
        .ndo_set_rx_mode        = amd8111e_set_multicast_list,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_set_mac_address    = amd8111e_set_mac_address,
        .ndo_do_ioctl           = amd8111e_ioctl,
        .ndo_change_mtu         = amd8111e_change_mtu,
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller     = amd8111e_poll,
#endif
};

static int amd8111e_probe_one(struct pci_dev *pdev,
                                  const struct pci_device_id *ent)
{
        int err, i;
        unsigned long reg_addr,reg_len;
        struct amd8111e_priv *lp;
        struct net_device *dev;

        err = pci_enable_device(pdev);
        if(err){
                dev_err(&pdev->dev, "Cannot enable new PCI device\n");
                return err;
        }

        if(!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)){
                dev_err(&pdev->dev, "Cannot find PCI base address\n");
                err = -ENODEV;
                goto err_disable_pdev;
        }

        err = pci_request_regions(pdev, MODULE_NAME);
        if(err){
                dev_err(&pdev->dev, "Cannot obtain PCI resources\n");
                goto err_disable_pdev;
        }

        pci_set_master(pdev);

        /* Find power-management capability. */
        if (!pdev->pm_cap) {
                dev_err(&pdev->dev, "No Power Management capability\n");
                err = -ENODEV;
                goto err_free_reg;
        }

        /* Initialize DMA */
        if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) < 0) {
                dev_err(&pdev->dev, "DMA not supported\n");
                err = -ENODEV;
                goto err_free_reg;
        }

        reg_addr = pci_resource_start(pdev, 0);
        reg_len = pci_resource_len(pdev, 0);

        dev = alloc_etherdev(sizeof(struct amd8111e_priv));
        if (!dev) {
                err = -ENOMEM;
                goto err_free_reg;
        }

        SET_NETDEV_DEV(dev, &pdev->dev);

#if AMD8111E_VLAN_TAG_USED
        dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX ;
#endif

        lp = netdev_priv(dev);
        lp->pci_dev = pdev;
        lp->amd8111e_net_dev = dev;
        lp->pm_cap = pdev->pm_cap;

        spin_lock_init(&lp->lock);

        lp->mmio = devm_ioremap(&pdev->dev, reg_addr, reg_len);
        if (!lp->mmio) {
                dev_err(&pdev->dev, "Cannot map device registers\n");
                err = -ENOMEM;
                goto err_free_dev;
        }

        /* Initializing MAC address */
        for (i = 0; i < ETH_ALEN; i++)
                dev->dev_addr[i] = readb(lp->mmio + PADR + i);

        /* Setting user defined parametrs */
        lp->ext_phy_option = speed_duplex[card_idx];
        if(coalesce[card_idx])
                lp->options |= OPTION_INTR_COAL_ENABLE;
        if(dynamic_ipg[card_idx++])
                lp->options |= OPTION_DYN_IPG_ENABLE;


        /* Initialize driver entry points */
        dev->netdev_ops = &amd8111e_netdev_ops;
        dev->ethtool_ops = &ops;
        dev->irq =pdev->irq;
        dev->watchdog_timeo = AMD8111E_TX_TIMEOUT;
        netif_napi_add(dev, &lp->napi, amd8111e_rx_poll, 32);

#if AMD8111E_VLAN_TAG_USED
        dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
#endif
        /* Probe the external PHY */
        amd8111e_probe_ext_phy(dev);

        /* setting mii default values */
        lp->mii_if.dev = dev;
        lp->mii_if.mdio_read = amd8111e_mdio_read;
        lp->mii_if.mdio_write = amd8111e_mdio_write;
        lp->mii_if.phy_id = lp->ext_phy_addr;

        /* Set receive buffer length and set jumbo option*/
        amd8111e_set_rx_buff_len(dev);


        err = register_netdev(dev);
        if (err) {
                dev_err(&pdev->dev, "Cannot register net device\n");
                goto err_free_dev;
        }

        pci_set_drvdata(pdev, dev);

        /* Initialize software ipg timer */
        if(lp->options & OPTION_DYN_IPG_ENABLE){
                init_timer(&lp->ipg_data.ipg_timer);
                lp->ipg_data.ipg_timer.data = (unsigned long) dev;
                lp->ipg_data.ipg_timer.function = (void *)&amd8111e_config_ipg;
                lp->ipg_data.ipg_timer.expires = jiffies +
                                                 IPG_CONVERGE_JIFFIES;
                lp->ipg_data.ipg = DEFAULT_IPG;
                lp->ipg_data.ipg_state = CSTATE;
        }

        /*  display driver and device information */
        chip_version = (readl(lp->mmio + CHIPID) & 0xf0000000)>>28;
        dev_info(&pdev->dev, "AMD-8111e Driver Version: %s\n", MODULE_VERS);
        dev_info(&pdev->dev, "[ Rev %x ] PCI 10/100BaseT Ethernet %pM\n",
                 chip_version, dev->dev_addr);
        if (lp->ext_phy_id)
                dev_info(&pdev->dev, "Found MII PHY ID 0x%08x at address 0x%02x\n",
                         lp->ext_phy_id, lp->ext_phy_addr);
        else
                dev_info(&pdev->dev, "Couldn't detect MII PHY, assuming address 0x01\n");

        return 0;

err_free_dev:
        free_netdev(dev);

err_free_reg:
        pci_release_regions(pdev);

err_disable_pdev:
        pci_disable_device(pdev);
        return err;

}

static void amd8111e_remove_one(struct pci_dev *pdev)
{
        struct net_device *dev = pci_get_drvdata(pdev);

        if (dev) {
                unregister_netdev(dev);
                free_netdev(dev);
                pci_release_regions(pdev);
                pci_disable_device(pdev);
        }
}

static const struct pci_device_id amd8111e_pci_tbl[] = {
        {
         .vendor = PCI_VENDOR_ID_AMD,
         .device = PCI_DEVICE_ID_AMD8111E_7462,
        },
        {
         .vendor = 0,
        }
};
MODULE_DEVICE_TABLE(pci, amd8111e_pci_tbl);

static struct pci_driver amd8111e_driver = {
        .name           = MODULE_NAME,
        .id_table       = amd8111e_pci_tbl,
        .probe          = amd8111e_probe_one,
        .remove         = amd8111e_remove_one,
        .suspend        = amd8111e_suspend,
        .resume         = amd8111e_resume
};

module_pci_driver(amd8111e_driver);