/*
 * Agere Systems Inc.
 * 10/100/1000 Base-T Ethernet Driver for the ET1301 and ET131x series MACs
 *
 * Copyright © 2005 Agere Systems Inc.
 * All rights reserved.
 *   http://www.agere.com
 *
 * Copyright (c) 2011 Mark Einon <mark.einon@gmail.com>
 *
 *------------------------------------------------------------------------------
 *
 * SOFTWARE LICENSE
 *
 * This software is provided subject to the following terms and conditions,
 * which you should read carefully before using the software.  Using this
 * software indicates your acceptance of these terms and conditions.  If you do
 * not agree with these terms and conditions, do not use the software.
 *
 * Copyright © 2005 Agere Systems Inc.
 * All rights reserved.
 *
 * Redistribution and use in source or binary forms, with or without
 * modifications, are permitted provided that the following conditions are met:
 *
 * . Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following Disclaimer as comments in the code as
 *    well as in the documentation and/or other materials provided with the
 *    distribution.
 *
 * . Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following Disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * . Neither the name of Agere Systems Inc. nor the names of the contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * Disclaimer
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, INFRINGEMENT AND THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  ANY
 * USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE IS SOLELY AT THE USERS OWN
 * RISK. IN NO EVENT SHALL AGERE SYSTEMS INC. OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, INCLUDING, BUT NOT LIMITED TO, CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/pci.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>

#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/in.h>
#include <linux/delay.h>
#include <linux/bitops.h>
#include <linux/io.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/ioport.h>
#include <linux/crc32.h>
#include <linux/random.h>
#include <linux/phy.h>

#include "et131x.h"

MODULE_AUTHOR("Victor Soriano <vjsoriano@agere.com>");
MODULE_AUTHOR("Mark Einon <mark.einon@gmail.com>");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("10/100/1000 Base-T Ethernet Driver for the ET1310 by Agere Systems");

/* EEPROM defines */
#define MAX_NUM_REGISTER_POLLS          1000
#define MAX_NUM_WRITE_RETRIES           2

/* MAC defines */
#define COUNTER_WRAP_16_BIT 0x10000
#define COUNTER_WRAP_12_BIT 0x1000

/* PCI defines */
#define INTERNAL_MEM_SIZE       0x400   /* 1024 of internal memory */
#define INTERNAL_MEM_RX_OFFSET  0x1FF   /* 50%   Tx, 50%   Rx */

/* ISR defines */
/*
 * For interrupts, normal running is:
 *       rxdma_xfr_done, phy_interrupt, mac_stat_interrupt,
 *       watchdog_interrupt & txdma_xfer_done
 *
 * In both cases, when flow control is enabled for either Tx or bi-direction,
 * we additional enable rx_fbr0_low and rx_fbr1_low, so we know when the
 * buffer rings are running low.
 */
#define INT_MASK_DISABLE            0xffffffff

/* NOTE: Masking out MAC_STAT Interrupt for now...
 * #define INT_MASK_ENABLE             0xfff6bf17
 * #define INT_MASK_ENABLE_NO_FLOW     0xfff6bfd7
 */
#define INT_MASK_ENABLE             0xfffebf17
#define INT_MASK_ENABLE_NO_FLOW     0xfffebfd7

/* General defines */
/* Packet and header sizes */
#define NIC_MIN_PACKET_SIZE     60

/* Multicast list size */
#define NIC_MAX_MCAST_LIST      128

/* Supported Filters */
#define ET131X_PACKET_TYPE_DIRECTED             0x0001
#define ET131X_PACKET_TYPE_MULTICAST            0x0002
#define ET131X_PACKET_TYPE_BROADCAST            0x0004
#define ET131X_PACKET_TYPE_PROMISCUOUS          0x0008
#define ET131X_PACKET_TYPE_ALL_MULTICAST        0x0010

/* Tx Timeout */
#define ET131X_TX_TIMEOUT       (1 * HZ)
#define NIC_SEND_HANG_THRESHOLD 0

/* MP_TCB flags */
#define fMP_DEST_MULTI                  0x00000001
#define fMP_DEST_BROAD                  0x00000002

/* MP_ADAPTER flags */
#define fMP_ADAPTER_RECV_LOOKASIDE      0x00000004
#define fMP_ADAPTER_INTERRUPT_IN_USE    0x00000008

/* MP_SHARED flags */
#define fMP_ADAPTER_LOWER_POWER         0x00200000

#define fMP_ADAPTER_NON_RECOVER_ERROR   0x00800000
#define fMP_ADAPTER_HARDWARE_ERROR      0x04000000

#define fMP_ADAPTER_FAIL_SEND_MASK      0x3ff00000

/* Some offsets in PCI config space that are actually used. */
#define ET1310_PCI_MAC_ADDRESS          0xA4
#define ET1310_PCI_EEPROM_STATUS        0xB2
#define ET1310_PCI_ACK_NACK             0xC0
#define ET1310_PCI_REPLAY               0xC2
#define ET1310_PCI_L0L1LATENCY          0xCF

/* PCI Product IDs */
#define ET131X_PCI_DEVICE_ID_GIG        0xED00  /* ET1310 1000 Base-T 8 */
#define ET131X_PCI_DEVICE_ID_FAST       0xED01  /* ET1310 100  Base-T */

/* Define order of magnitude converter */
#define NANO_IN_A_MICRO 1000

#define PARM_RX_NUM_BUFS_DEF    4
#define PARM_RX_TIME_INT_DEF    10
#define PARM_RX_MEM_END_DEF     0x2bc
#define PARM_TX_TIME_INT_DEF    40
#define PARM_TX_NUM_BUFS_DEF    4
#define PARM_DMA_CACHE_DEF      0

/* RX defines */
#define USE_FBR0 1
#define FBR_CHUNKS 32
#define MAX_DESC_PER_RING_RX         1024

/* number of RFDs - default and min */
#ifdef USE_FBR0
#define RFD_LOW_WATER_MARK      40
#define NIC_DEFAULT_NUM_RFD     1024
#define NUM_FBRS                2
#else
#define RFD_LOW_WATER_MARK      20
#define NIC_DEFAULT_NUM_RFD     256
#define NUM_FBRS                1
#endif

#define NIC_MIN_NUM_RFD         64
#define NUM_PACKETS_HANDLED     256

#define ALCATEL_MULTICAST_PKT   0x01000000
#define ALCATEL_BROADCAST_PKT   0x02000000

/* typedefs for Free Buffer Descriptors */
struct fbr_desc {
        u32 addr_lo;
        u32 addr_hi;
        u32 word2;              /* Bits 10-31 reserved, 0-9 descriptor */
};

/* Packet Status Ring Descriptors
 *
 * Word 0:
 *
 * top 16 bits are from the Alcatel Status Word as enumerated in
 * PE-MCXMAC Data Sheet IPD DS54 0210-1 (also IPD-DS80 0205-2)
 *
 * 0: hp                        hash pass
 * 1: ipa                       IP checksum assist
 * 2: ipp                       IP checksum pass
 * 3: tcpa                      TCP checksum assist
 * 4: tcpp                      TCP checksum pass
 * 5: wol                       WOL Event
 * 6: rxmac_error               RXMAC Error Indicator
 * 7: drop                      Drop packet
 * 8: ft                        Frame Truncated
 * 9: jp                        Jumbo Packet
 * 10: vp                       VLAN Packet
 * 11-15: unused
 * 16: asw_prev_pkt_dropped     e.g. IFG too small on previous
 * 17: asw_RX_DV_event          short receive event detected
 * 18: asw_false_carrier_event  bad carrier since last good packet
 * 19: asw_code_err             one or more nibbles signalled as errors
 * 20: asw_CRC_err              CRC error
 * 21: asw_len_chk_err          frame length field incorrect
 * 22: asw_too_long             frame length > 1518 bytes
 * 23: asw_OK                   valid CRC + no code error
 * 24: asw_multicast            has a multicast address
 * 25: asw_broadcast            has a broadcast address
 * 26: asw_dribble_nibble       spurious bits after EOP
 * 27: asw_control_frame        is a control frame
 * 28: asw_pause_frame          is a pause frame
 * 29: asw_unsupported_op       unsupported OP code
 * 30: asw_VLAN_tag             VLAN tag detected
 * 31: asw_long_evt             Rx long event
 *
 * Word 1:
 * 0-15: length                 length in bytes
 * 16-25: bi                    Buffer Index
 * 26-27: ri                    Ring Index
 * 28-31: reserved
 */

struct pkt_stat_desc {
        u32 word0;
        u32 word1;
};

/* Typedefs for the RX DMA status word */

/*
 * rx status word 0 holds part of the status bits of the Rx DMA engine
 * that get copied out to memory by the ET-1310.  Word 0 is a 32 bit word
 * which contains the Free Buffer ring 0 and 1 available offset.
 *
 * bit 0-9 FBR1 offset
 * bit 10 Wrap flag for FBR1
 * bit 16-25 FBR0 offset
 * bit 26 Wrap flag for FBR0
 */

/*
 * RXSTAT_WORD1_t structure holds part of the status bits of the Rx DMA engine
 * that get copied out to memory by the ET-1310.  Word 3 is a 32 bit word
 * which contains the Packet Status Ring available offset.
 *
 * bit 0-15 reserved
 * bit 16-27 PSRoffset
 * bit 28 PSRwrap
 * bit 29-31 unused
 */

/*
 * struct rx_status_block is a structure representing the status of the Rx
 * DMA engine it sits in free memory, and is pointed to by 0x101c / 0x1020
 */
struct rx_status_block {
        u32 word0;
        u32 word1;
};

/*
 * Structure for look-up table holding free buffer ring pointers, addresses
 * and state.
 */
struct fbr_lookup {
        void            *virt[MAX_DESC_PER_RING_RX];
        void            *buffer1[MAX_DESC_PER_RING_RX];
        void            *buffer2[MAX_DESC_PER_RING_RX];
        u32              bus_high[MAX_DESC_PER_RING_RX];
        u32              bus_low[MAX_DESC_PER_RING_RX];
        void            *ring_virtaddr;
        dma_addr_t       ring_physaddr;
        void            *mem_virtaddrs[MAX_DESC_PER_RING_RX / FBR_CHUNKS];
        dma_addr_t       mem_physaddrs[MAX_DESC_PER_RING_RX / FBR_CHUNKS];
        u64              real_physaddr;
        u64              offset;
        u32              local_full;
        u32              num_entries;
        u32              buffsize;
};

/*
 * struct rx_ring is the sructure representing the adaptor's local
 * reference(s) to the rings
 *
 ******************************************************************************
 * IMPORTANT NOTE :- fbr_lookup *fbr[NUM_FBRS] uses index 0 to refer to FBR1
 *                      and index 1 to refer to FRB0
 ******************************************************************************
 */
struct rx_ring {
        struct fbr_lookup *fbr[NUM_FBRS];
        void *ps_ring_virtaddr;
        dma_addr_t ps_ring_physaddr;
        u32 local_psr_full;
        u32 psr_num_entries;

        struct rx_status_block *rx_status_block;
        dma_addr_t rx_status_bus;

        /* RECV */
        struct list_head recv_list;
        u32 num_ready_recv;

        u32 num_rfd;

        bool unfinished_receives;

        /* lookaside lists */
        struct kmem_cache *recv_lookaside;
};

/* TX defines */
/*
 * word 2 of the control bits in the Tx Descriptor ring for the ET-1310
 *
 * 0-15: length of packet
 * 16-27: VLAN tag
 * 28: VLAN CFI
 * 29-31: VLAN priority
 *
 * word 3 of the control bits in the Tx Descriptor ring for the ET-1310
 *
 * 0: last packet in the sequence
 * 1: first packet in the sequence
 * 2: interrupt the processor when this pkt sent
 * 3: Control word - no packet data
 * 4: Issue half-duplex backpressure : XON/XOFF
 * 5: send pause frame
 * 6: Tx frame has error
 * 7: append CRC
 * 8: MAC override
 * 9: pad packet
 * 10: Packet is a Huge packet
 * 11: append VLAN tag
 * 12: IP checksum assist
 * 13: TCP checksum assist
 * 14: UDP checksum assist
 */

/* struct tx_desc represents each descriptor on the ring */
struct tx_desc {
        u32 addr_hi;
        u32 addr_lo;
        u32 len_vlan;   /* control words how to xmit the */
        u32 flags;      /* data (detailed above) */
};

/*
 * The status of the Tx DMA engine it sits in free memory, and is pointed to
 * by 0x101c / 0x1020. This is a DMA10 type
 */

/* TCB (Transmit Control Block: Host Side) */
struct tcb {
        struct tcb *next;       /* Next entry in ring */
        u32 flags;              /* Our flags for the packet */
        u32 count;              /* Used to spot stuck/lost packets */
        u32 stale;              /* Used to spot stuck/lost packets */
        struct sk_buff *skb;    /* Network skb we are tied to */
        u32 index;              /* Ring indexes */
        u32 index_start;
};

/* Structure representing our local reference(s) to the ring */
struct tx_ring {
        /* TCB (Transmit Control Block) memory and lists */
        struct tcb *tcb_ring;

        /* List of TCBs that are ready to be used */
        struct tcb *tcb_qhead;
        struct tcb *tcb_qtail;

        /* list of TCBs that are currently being sent.  NOTE that access to all
         * three of these (including used) are controlled via the
         * TCBSendQLock.  This lock should be secured prior to incementing /
         * decrementing used, or any queue manipulation on send_head /
         * tail
         */
        struct tcb *send_head;
        struct tcb *send_tail;
        int used;

        /* The actual descriptor ring */
        struct tx_desc *tx_desc_ring;
        dma_addr_t tx_desc_ring_pa;

        /* send_idx indicates where we last wrote to in the descriptor ring. */
        u32 send_idx;

        /* The location of the write-back status block */
        u32 *tx_status;
        dma_addr_t tx_status_pa;

        /* Packets since the last IRQ: used for interrupt coalescing */
        int since_irq;
};

/*
 * Do not change these values: if changed, then change also in respective
 * TXdma and Rxdma engines
 */
#define NUM_DESC_PER_RING_TX         512    /* TX Do not change these values */
#define NUM_TCB                      64

/*
 * These values are all superseded by registry entries to facilitate tuning.
 * Once the desired performance has been achieved, the optimal registry values
 * should be re-populated to these #defines:
 */
#define TX_ERROR_PERIOD             1000

#define LO_MARK_PERCENT_FOR_PSR     15
#define LO_MARK_PERCENT_FOR_RX      15

/* RFD (Receive Frame Descriptor) */
struct rfd {
        struct list_head list_node;
        struct sk_buff *skb;
        u32 len;        /* total size of receive frame */
        u16 bufferindex;
        u8 ringindex;
};

/* Flow Control */
#define FLOW_BOTH       0
#define FLOW_TXONLY     1
#define FLOW_RXONLY     2
#define FLOW_NONE       3

/* Struct to define some device statistics */
struct ce_stats {
        /* MIB II variables
         *
         * NOTE: atomic_t types are only guaranteed to store 24-bits; if we
         * MUST have 32, then we'll need another way to perform atomic
         * operations
         */
        u32             unicast_pkts_rcvd;
        atomic_t        unicast_pkts_xmtd;
        u32             multicast_pkts_rcvd;
        atomic_t        multicast_pkts_xmtd;
        u32             broadcast_pkts_rcvd;
        atomic_t        broadcast_pkts_xmtd;
        u32             rcvd_pkts_dropped;

        /* Tx Statistics. */
        u32             tx_underflows;

        u32             tx_collisions;
        u32             tx_excessive_collisions;
        u32             tx_first_collisions;
        u32             tx_late_collisions;
        u32             tx_max_pkt_errs;
        u32             tx_deferred;

        /* Rx Statistics. */
        u32             rx_overflows;

        u32             rx_length_errs;
        u32             rx_align_errs;
        u32             rx_crc_errs;
        u32             rx_code_violations;
        u32             rx_other_errs;

        u32             synchronous_iterations;
        u32             interrupt_status;
};

/* The private adapter structure */
struct et131x_adapter {
        struct net_device *netdev;
        struct pci_dev *pdev;
        struct mii_bus *mii_bus;
        struct phy_device *phydev;
        struct work_struct task;

        /* Flags that indicate current state of the adapter */
        u32 flags;

        /* local link state, to determine if a state change has occurred */
        int link;

        /* Configuration  */
        u8 rom_addr[ETH_ALEN];
        u8 addr[ETH_ALEN];
        bool has_eeprom;
        u8 eeprom_data[2];

        /* Spinlocks */
        spinlock_t lock;

        spinlock_t tcb_send_qlock;
        spinlock_t tcb_ready_qlock;
        spinlock_t send_hw_lock;

        spinlock_t rcv_lock;
        spinlock_t rcv_pend_lock;
        spinlock_t fbr_lock;

        spinlock_t phy_lock;

        /* Packet Filter and look ahead size */
        u32 packet_filter;

        /* multicast list */
        u32 multicast_addr_count;
        u8 multicast_list[NIC_MAX_MCAST_LIST][ETH_ALEN];

        /* Pointer to the device's PCI register space */
        struct address_map __iomem *regs;

        /* Registry parameters */
        u8 wanted_flow;         /* Flow we want for 802.3x flow control */
        u32 registry_jumbo_packet;      /* Max supported ethernet packet size */

        /* Derived from the registry: */
        u8 flowcontrol;         /* flow control validated by the far-end */

        /* Minimize init-time */
        struct timer_list error_timer;

        /* variable putting the phy into coma mode when boot up with no cable
         * plugged in after 5 seconds
         */
        u8 boot_coma;

        /* Next two used to save power information at power down. This
         * information will be used during power up to set up parts of Power
         * Management in JAGCore
         */
        u16 pdown_speed;
        u8 pdown_duplex;

        /* Tx Memory Variables */
        struct tx_ring tx_ring;

        /* Rx Memory Variables */
        struct rx_ring rx_ring;

        /* Stats */
        struct ce_stats stats;

        struct net_device_stats net_stats;
};

static int eeprom_wait_ready(struct pci_dev *pdev, u32 *status)
{
        u32 reg;
        int i;

        /*
         * 1. Check LBCIF Status Register for bits 6 & 3:2 all equal to 0 and
         *    bits 7,1:0 both equal to 1, at least once after reset.
         *    Subsequent operations need only to check that bits 1:0 are equal
         *    to 1 prior to starting a single byte read/write
         */

        for (i = 0; i < MAX_NUM_REGISTER_POLLS; i++) {
                /* Read registers grouped in DWORD1 */
                if (pci_read_config_dword(pdev, LBCIF_DWORD1_GROUP, &reg))
                        return -EIO;

                /* I2C idle and Phy Queue Avail both true */
                if ((reg & 0x3000) == 0x3000) {
                        if (status)
                                *status = reg;
                        return reg & 0xFF;
                }
        }
        return -ETIMEDOUT;
}


/**
 * eeprom_write - Write a byte to the ET1310's EEPROM
 * @adapter: pointer to our private adapter structure
 * @addr: the address to write
 * @data: the value to write
 *
 * Returns 1 for a successful write.
 */
static int eeprom_write(struct et131x_adapter *adapter, u32 addr, u8 data)
{
        struct pci_dev *pdev = adapter->pdev;
        int index = 0;
        int retries;
        int err = 0;
        int i2c_wack = 0;
        int writeok = 0;
        u32 status;
        u32 val = 0;

        /*
         * For an EEPROM, an I2C single byte write is defined as a START
         * condition followed by the device address, EEPROM address, one byte
         * of data and a STOP condition.  The STOP condition will trigger the
         * EEPROM's internally timed write cycle to the nonvolatile memory.
         * All inputs are disabled during this write cycle and the EEPROM will
         * not respond to any access until the internal write is complete.
         */

        err = eeprom_wait_ready(pdev, NULL);
        if (err)
                return err;

         /*
         * 2. Write to the LBCIF Control Register:  bit 7=1, bit 6=1, bit 3=0,
         *    and bits 1:0 both =0.  Bit 5 should be set according to the
         *    type of EEPROM being accessed (1=two byte addressing, 0=one
         *    byte addressing).
         */
        if (pci_write_config_byte(pdev, LBCIF_CONTROL_REGISTER,
                        LBCIF_CONTROL_LBCIF_ENABLE | LBCIF_CONTROL_I2C_WRITE))
                return -EIO;

        i2c_wack = 1;

        /* Prepare EEPROM address for Step 3 */

        for (retries = 0; retries < MAX_NUM_WRITE_RETRIES; retries++) {
                /* Write the address to the LBCIF Address Register */
                if (pci_write_config_dword(pdev, LBCIF_ADDRESS_REGISTER, addr))
                        break;
                /*
                 * Write the data to the LBCIF Data Register (the I2C write
                 * will begin).
                 */
                if (pci_write_config_byte(pdev, LBCIF_DATA_REGISTER, data))
                        break;
                /*
                 * Monitor bit 1:0 of the LBCIF Status Register.  When bits
                 * 1:0 are both equal to 1, the I2C write has completed and the
                 * internal write cycle of the EEPROM is about to start.
                 * (bits 1:0 = 01 is a legal state while waiting from both
                 * equal to 1, but bits 1:0 = 10 is invalid and implies that
                 * something is broken).
                 */
                err = eeprom_wait_ready(pdev, &status);
                if (err < 0)
                        return 0;

                /*
                 * Check bit 3 of the LBCIF Status Register.  If  equal to 1,
                 * an error has occurred.Don't break here if we are revision
                 * 1, this is so we do a blind write for load bug.
                 */
                if ((status & LBCIF_STATUS_GENERAL_ERROR)
                        && adapter->pdev->revision == 0)
                        break;

                /*
                 * Check bit 2 of the LBCIF Status Register.  If equal to 1 an
                 * ACK error has occurred on the address phase of the write.
                 * This could be due to an actual hardware failure or the
                 * EEPROM may still be in its internal write cycle from a
                 * previous write. This write operation was ignored and must be
                  *repeated later.
                 */
                if (status & LBCIF_STATUS_ACK_ERROR) {
                        /*
                         * This could be due to an actual hardware failure
                         * or the EEPROM may still be in its internal write
                         * cycle from a previous write. This write operation
                         * was ignored and must be repeated later.
                         */
                        udelay(10);
                        continue;
                }

                writeok = 1;
                break;
        }

        /*
         * Set bit 6 of the LBCIF Control Register = 0.
         */
        udelay(10);

        while (i2c_wack) {
                if (pci_write_config_byte(pdev, LBCIF_CONTROL_REGISTER,
                        LBCIF_CONTROL_LBCIF_ENABLE))
                        writeok = 0;

                /* Do read until internal ACK_ERROR goes away meaning write
                 * completed
                 */
                do {
                        pci_write_config_dword(pdev,
                                               LBCIF_ADDRESS_REGISTER,
                                               addr);
                        do {
                                pci_read_config_dword(pdev,
                                        LBCIF_DATA_REGISTER, &val);
                        } while ((val & 0x00010000) == 0);
                } while (val & 0x00040000);

                if ((val & 0xFF00) != 0xC000 || index == 10000)
                        break;
                index++;
        }
        return writeok ? 0 : -EIO;
}

/**
 * eeprom_read - Read a byte from the ET1310's EEPROM
 * @adapter: pointer to our private adapter structure
 * @addr: the address from which to read
 * @pdata: a pointer to a byte in which to store the value of the read
 * @eeprom_id: the ID of the EEPROM
 * @addrmode: how the EEPROM is to be accessed
 *
 * Returns 1 for a successful read
 */
static int eeprom_read(struct et131x_adapter *adapter, u32 addr, u8 *pdata)
{
        struct pci_dev *pdev = adapter->pdev;
        int err;
        u32 status;

        /*
         * A single byte read is similar to the single byte write, with the
         * exception of the data flow:
         */

        err = eeprom_wait_ready(pdev, NULL);
        if (err)
                return err;
        /*
         * Write to the LBCIF Control Register:  bit 7=1, bit 6=0, bit 3=0,
         * and bits 1:0 both =0.  Bit 5 should be set according to the type
         * of EEPROM being accessed (1=two byte addressing, 0=one byte
         * addressing).
         */
        if (pci_write_config_byte(pdev, LBCIF_CONTROL_REGISTER,
                                  LBCIF_CONTROL_LBCIF_ENABLE))
                return -EIO;
        /*
         * Write the address to the LBCIF Address Register (I2C read will
         * begin).
         */
        if (pci_write_config_dword(pdev, LBCIF_ADDRESS_REGISTER, addr))
                return -EIO;
        /*
         * Monitor bit 0 of the LBCIF Status Register.  When = 1, I2C read
         * is complete. (if bit 1 =1 and bit 0 stays = 0, a hardware failure
         * has occurred).
         */
        err = eeprom_wait_ready(pdev, &status);
        if (err < 0)
                return err;
        /*
         * Regardless of error status, read data byte from LBCIF Data
         * Register.
         */
        *pdata = err;
        /*
         * Check bit 2 of the LBCIF Status Register.  If = 1,
         * then an error has occurred.
         */
        return (status & LBCIF_STATUS_ACK_ERROR) ? -EIO : 0;
}

static int et131x_init_eeprom(struct et131x_adapter *adapter)
{
        struct pci_dev *pdev = adapter->pdev;
        u8 eestatus;

        /* We first need to check the EEPROM Status code located at offset
         * 0xB2 of config space
         */
        pci_read_config_byte(pdev, ET1310_PCI_EEPROM_STATUS,
                                      &eestatus);

        /* THIS IS A WORKAROUND:
         * I need to call this function twice to get my card in a
         * LG M1 Express Dual running. I tried also a msleep before this
         * function, because I thought there could be some time condidions
         * but it didn't work. Call the whole function twice also work.
         */
        if (pci_read_config_byte(pdev, ET1310_PCI_EEPROM_STATUS, &eestatus)) {
                dev_err(&pdev->dev,
                       "Could not read PCI config space for EEPROM Status\n");
                return -EIO;
        }

        /* Determine if the error(s) we care about are present. If they are
         * present we need to fail.
         */
        if (eestatus & 0x4C) {
                int write_failed = 0;
                if (pdev->revision == 0x01) {
                        int     i;
                        static const u8 eedata[4] = { 0xFE, 0x13, 0x10, 0xFF };

                        /* Re-write the first 4 bytes if we have an eeprom
                         * present and the revision id is 1, this fixes the
                         * corruption seen with 1310 B Silicon
                         */
                        for (i = 0; i < 3; i++)
                                if (eeprom_write(adapter, i, eedata[i]) < 0)
                                        write_failed = 1;
                }
                if (pdev->revision  != 0x01 || write_failed) {
                        dev_err(&pdev->dev,
                            "Fatal EEPROM Status Error - 0x%04x\n", eestatus);

                        /* This error could mean that there was an error
                         * reading the eeprom or that the eeprom doesn't exist.
                         * We will treat each case the same and not try to
                         * gather additional information that normally would
                         * come from the eeprom, like MAC Address
                         */
                        adapter->has_eeprom = 0;
                        return -EIO;
                }
        }
        adapter->has_eeprom = 1;

        /* Read the EEPROM for information regarding LED behavior. Refer to
         * ET1310_phy.c, et131x_xcvr_init(), for its use.
         */
        eeprom_read(adapter, 0x70, &adapter->eeprom_data[0]);
        eeprom_read(adapter, 0x71, &adapter->eeprom_data[1]);

        if (adapter->eeprom_data[0] != 0xcd)
                /* Disable all optional features */
                adapter->eeprom_data[1] = 0x00;

        return 0;
}

/**
 * et131x_rx_dma_enable - re-start of Rx_DMA on the ET1310.
 * @adapter: pointer to our adapter structure
 */
static void et131x_rx_dma_enable(struct et131x_adapter *adapter)
{
        /* Setup the receive dma configuration register for normal operation */
        u32 csr =  0x2000;      /* FBR1 enable */

        if (adapter->rx_ring.fbr[0]->buffsize == 4096)
                csr |= 0x0800;
        else if (adapter->rx_ring.fbr[0]->buffsize == 8192)
                csr |= 0x1000;
        else if (adapter->rx_ring.fbr[0]->buffsize == 16384)
                csr |= 0x1800;
#ifdef USE_FBR0
        csr |= 0x0400;          /* FBR0 enable */
        if (adapter->rx_ring.fbr[1]->buffsize == 256)
                csr |= 0x0100;
        else if (adapter->rx_ring.fbr[1]->buffsize == 512)
                csr |= 0x0200;
        else if (adapter->rx_ring.fbr[1]->buffsize == 1024)
                csr |= 0x0300;
#endif
        writel(csr, &adapter->regs->rxdma.csr);

        csr = readl(&adapter->regs->rxdma.csr);
        if ((csr & 0x00020000) != 0) {
                udelay(5);
                csr = readl(&adapter->regs->rxdma.csr);
                if ((csr & 0x00020000) != 0) {
                        dev_err(&adapter->pdev->dev,
                            "RX Dma failed to exit halt state.  CSR 0x%08x\n",
                                csr);
                }
        }
}

/**
 * et131x_rx_dma_disable - Stop of Rx_DMA on the ET1310
 * @adapter: pointer to our adapter structure
 */
static void et131x_rx_dma_disable(struct et131x_adapter *adapter)
{
        u32 csr;
        /* Setup the receive dma configuration register */
        writel(0x00002001, &adapter->regs->rxdma.csr);
        csr = readl(&adapter->regs->rxdma.csr);
        if ((csr & 0x00020000) == 0) {  /* Check halt status (bit 17) */
                udelay(5);
                csr = readl(&adapter->regs->rxdma.csr);
                if ((csr & 0x00020000) == 0)
                        dev_err(&adapter->pdev->dev,
                        "RX Dma failed to enter halt state. CSR 0x%08x\n",
                                csr);
        }
}

/**
 * et131x_tx_dma_enable - re-start of Tx_DMA on the ET1310.
 * @adapter: pointer to our adapter structure
 *
 * Mainly used after a return to the D0 (full-power) state from a lower state.
 */
static void et131x_tx_dma_enable(struct et131x_adapter *adapter)
{
        /* Setup the transmit dma configuration register for normal
         * operation
         */
        writel(ET_TXDMA_SNGL_EPKT|(PARM_DMA_CACHE_DEF << ET_TXDMA_CACHE_SHIFT),
                                        &adapter->regs->txdma.csr);
}

static inline void add_10bit(u32 *v, int n)
{
        *v = INDEX10(*v + n) | (*v & ET_DMA10_WRAP);
}

static inline void add_12bit(u32 *v, int n)
{
        *v = INDEX12(*v + n) | (*v & ET_DMA12_WRAP);
}

/**
 * et1310_config_mac_regs1 - Initialize the first part of MAC regs
 * @adapter: pointer to our adapter structure
 */
static void et1310_config_mac_regs1(struct et131x_adapter *adapter)
{
        struct mac_regs __iomem *macregs = &adapter->regs->mac;
        u32 station1;
        u32 station2;
        u32 ipg;

        /* First we need to reset everything.  Write to MAC configuration
         * register 1 to perform reset.
         */
        writel(0xC00F0000, &macregs->cfg1);

        /* Next lets configure the MAC Inter-packet gap register */
        ipg = 0x38005860;               /* IPG1 0x38 IPG2 0x58 B2B 0x60 */
        ipg |= 0x50 << 8;               /* ifg enforce 0x50 */
        writel(ipg, &macregs->ipg);

        /* Next lets configure the MAC Half Duplex register */
        /* BEB trunc 0xA, Ex Defer, Rexmit 0xF Coll 0x37 */
        writel(0x00A1F037, &macregs->hfdp);

        /* Next lets configure the MAC Interface Control register */
        writel(0, &macregs->if_ctrl);

        /* Let's move on to setting up the mii management configuration */
        writel(0x07, &macregs->mii_mgmt_cfg);   /* Clock reset 0x7 */

        /* Next lets configure the MAC Station Address register.  These
         * values are read from the EEPROM during initialization and stored
         * in the adapter structure.  We write what is stored in the adapter
         * structure to the MAC Station Address registers high and low.  This
         * station address is used for generating and checking pause control
         * packets.
         */
        station2 = (adapter->addr[1] << ET_MAC_STATION_ADDR2_OC2_SHIFT) |
                   (adapter->addr[0] << ET_MAC_STATION_ADDR2_OC1_SHIFT);
        station1 = (adapter->addr[5] << ET_MAC_STATION_ADDR1_OC6_SHIFT) |
                   (adapter->addr[4] << ET_MAC_STATION_ADDR1_OC5_SHIFT) |
                   (adapter->addr[3] << ET_MAC_STATION_ADDR1_OC4_SHIFT) |
                    adapter->addr[2];
        writel(station1, &macregs->station_addr_1);
        writel(station2, &macregs->station_addr_2);

        /* Max ethernet packet in bytes that will be passed by the mac without
         * being truncated.  Allow the MAC to pass 4 more than our max packet
         * size.  This is 4 for the Ethernet CRC.
         *
         * Packets larger than (registry_jumbo_packet) that do not contain a
         * VLAN ID will be dropped by the Rx function.
         */
        writel(adapter->registry_jumbo_packet + 4, &macregs->max_fm_len);

        /* clear out MAC config reset */
        writel(0, &macregs->cfg1);

}

/**
 * et1310_config_mac_regs2 - Initialize the second part of MAC regs
 * @adapter: pointer to our adapter structure
 */
static void et1310_config_mac_regs2(struct et131x_adapter *adapter)
{
        int32_t delay = 0;
        struct mac_regs __iomem *mac = &adapter->regs->mac;
        struct phy_device *phydev = adapter->phydev;
        u32 cfg1;
        u32 cfg2;
        u32 ifctrl;
        u32 ctl;

        ctl = readl(&adapter->regs->txmac.ctl);
        cfg1 = readl(&mac->cfg1);
        cfg2 = readl(&mac->cfg2);
        ifctrl = readl(&mac->if_ctrl);

        /* Set up the if mode bits */
        cfg2 &= ~0x300;
        if (phydev && phydev->speed == SPEED_1000) {
                cfg2 |= 0x200;
                /* Phy mode bit */
                ifctrl &= ~(1 << 24);
        } else {
                cfg2 |= 0x100;
                ifctrl |= (1 << 24);
        }

        /* We need to enable Rx/Tx */
        cfg1 |= CFG1_RX_ENABLE | CFG1_TX_ENABLE | CFG1_TX_FLOW;
        /* Initialize loop back to off */
        cfg1 &= ~(CFG1_LOOPBACK | CFG1_RX_FLOW);
        if (adapter->flowcontrol == FLOW_RXONLY ||
                                adapter->flowcontrol == FLOW_BOTH)
                cfg1 |= CFG1_RX_FLOW;
        writel(cfg1, &mac->cfg1);

        /* Now we need to initialize the MAC Configuration 2 register */
        /* preamble 7, check length, huge frame off, pad crc, crc enable
           full duplex off */
        cfg2 |= 0x7016;
        cfg2 &= ~0x0021;

        /* Turn on duplex if needed */
        if (phydev && phydev->duplex == DUPLEX_FULL)
                cfg2 |= 0x01;

        ifctrl &= ~(1 << 26);
        if (phydev && phydev->duplex == DUPLEX_HALF)
                ifctrl |= (1<<26);      /* Enable ghd */

        writel(ifctrl, &mac->if_ctrl);
        writel(cfg2, &mac->cfg2);

        do {
                udelay(10);
                delay++;
                cfg1 = readl(&mac->cfg1);
        } while ((cfg1 & CFG1_WAIT) != CFG1_WAIT && delay < 100);

        if (delay == 100) {
                dev_warn(&adapter->pdev->dev,
                    "Syncd bits did not respond correctly cfg1 word 0x%08x\n",
                        cfg1);
        }

        /* Enable txmac */
        ctl |= 0x09;    /* TX mac enable, FC disable */
        writel(ctl, &adapter->regs->txmac.ctl);

        /* Ready to start the RXDMA/TXDMA engine */
        if (adapter->flags & fMP_ADAPTER_LOWER_POWER) {
                et131x_rx_dma_enable(adapter);
                et131x_tx_dma_enable(adapter);
        }
}

/**
 * et1310_in_phy_coma - check if the device is in phy coma
 * @adapter: pointer to our adapter structure
 *
 * Returns 0 if the device is not in phy coma, 1 if it is in phy coma
 */
static int et1310_in_phy_coma(struct et131x_adapter *adapter)
{
        u32 pmcsr;

        pmcsr = readl(&adapter->regs->global.pm_csr);

        return ET_PM_PHY_SW_COMA & pmcsr ? 1 : 0;
}

static void et1310_setup_device_for_multicast(struct et131x_adapter *adapter)
{
        struct rxmac_regs __iomem *rxmac = &adapter->regs->rxmac;
        u32 hash1 = 0;
        u32 hash2 = 0;
        u32 hash3 = 0;
        u32 hash4 = 0;
        u32 pm_csr;

        /* If ET131X_PACKET_TYPE_MULTICAST is specified, then we provision
         * the multi-cast LIST.  If it is NOT specified, (and "ALL" is not
         * specified) then we should pass NO multi-cast addresses to the
         * driver.
         */
        if (adapter->packet_filter & ET131X_PACKET_TYPE_MULTICAST) {
                int i;

                /* Loop through our multicast array and set up the device */
                for (i = 0; i < adapter->multicast_addr_count; i++) {
                        u32 result;

                        result = ether_crc(6, adapter->multicast_list[i]);

                        result = (result & 0x3F800000) >> 23;

                        if (result < 32) {
                                hash1 |= (1 << result);
                        } else if ((31 < result) && (result < 64)) {
                                result -= 32;
                                hash2 |= (1 << result);
                        } else if ((63 < result) && (result < 96)) {
                                result -= 64;
                                hash3 |= (1 << result);
                        } else {
                                result -= 96;
                                hash4 |= (1 << result);
                        }
                }
        }

        /* Write out the new hash to the device */
        pm_csr = readl(&adapter->regs->global.pm_csr);
        if (!et1310_in_phy_coma(adapter)) {
                writel(hash1, &rxmac->multi_hash1);
                writel(hash2, &rxmac->multi_hash2);
                writel(hash3, &rxmac->multi_hash3);
                writel(hash4, &rxmac->multi_hash4);
        }
}

static void et1310_setup_device_for_unicast(struct et131x_adapter *adapter)
{
        struct rxmac_regs __iomem *rxmac = &adapter->regs->rxmac;
        u32 uni_pf1;
        u32 uni_pf2;
        u32 uni_pf3;
        u32 pm_csr;

        /* Set up unicast packet filter reg 3 to be the first two octets of
         * the MAC address for both address
         *
         * Set up unicast packet filter reg 2 to be the octets 2 - 5 of the
         * MAC address for second address
         *
         * Set up unicast packet filter reg 3 to be the octets 2 - 5 of the
         * MAC address for first address
         */
        uni_pf3 = (adapter->addr[0] << ET_UNI_PF_ADDR2_1_SHIFT) |
                  (adapter->addr[1] << ET_UNI_PF_ADDR2_2_SHIFT) |
                  (adapter->addr[0] << ET_UNI_PF_ADDR1_1_SHIFT) |
                   adapter->addr[1];

        uni_pf2 = (adapter->addr[2] << ET_UNI_PF_ADDR2_3_SHIFT) |
                  (adapter->addr[3] << ET_UNI_PF_ADDR2_4_SHIFT) |
                  (adapter->addr[4] << ET_UNI_PF_ADDR2_5_SHIFT) |
                   adapter->addr[5];

        uni_pf1 = (adapter->addr[2] << ET_UNI_PF_ADDR1_3_SHIFT) |
                  (adapter->addr[3] << ET_UNI_PF_ADDR1_4_SHIFT) |
                  (adapter->addr[4] << ET_UNI_PF_ADDR1_5_SHIFT) |
                   adapter->addr[5];

        pm_csr = readl(&adapter->regs->global.pm_csr);
        if (!et1310_in_phy_coma(adapter)) {
                writel(uni_pf1, &rxmac->uni_pf_addr1);
                writel(uni_pf2, &rxmac->uni_pf_addr2);
                writel(uni_pf3, &rxmac->uni_pf_addr3);
        }
}

static void et1310_config_rxmac_regs(struct et131x_adapter *adapter)
{
        struct rxmac_regs __iomem *rxmac = &adapter->regs->rxmac;
        struct phy_device *phydev = adapter->phydev;
        u32 sa_lo;
        u32 sa_hi = 0;
        u32 pf_ctrl = 0;

        /* Disable the MAC while it is being configured (also disable WOL) */
        writel(0x8, &rxmac->ctrl);

        /* Initialize WOL to disabled. */
        writel(0, &rxmac->crc0);
        writel(0, &rxmac->crc12);
        writel(0, &rxmac->crc34);

        /* We need to set the WOL mask0 - mask4 next.  We initialize it to
         * its default Values of 0x00000000 because there are not WOL masks
         * as of this time.
         */
        writel(0, &rxmac->mask0_word0);
        writel(0, &rxmac->mask0_word1);
        writel(0, &rxmac->mask0_word2);
        writel(0, &rxmac->mask0_word3);

        writel(0, &rxmac->mask1_word0);
        writel(0, &rxmac->mask1_word1);
        writel(0, &rxmac->mask1_word2);
        writel(0, &rxmac->mask1_word3);

        writel(0, &rxmac->mask2_word0);
        writel(0, &rxmac->mask2_word1);
        writel(0, &rxmac->mask2_word2);
        writel(0, &rxmac->mask2_word3);

        writel(0, &rxmac->mask3_word0);
        writel(0, &rxmac->mask3_word1);
        writel(0, &rxmac->mask3_word2);
        writel(0, &rxmac->mask3_word3);

        writel(0, &rxmac->mask4_word0);
        writel(0, &rxmac->mask4_word1);
        writel(0, &rxmac->mask4_word2);
        writel(0, &rxmac->mask4_word3);

        /* Lets setup the WOL Source Address */
        sa_lo = (adapter->addr[2] << ET_WOL_LO_SA3_SHIFT) |
                (adapter->addr[3] << ET_WOL_LO_SA4_SHIFT) |
                (adapter->addr[4] << ET_WOL_LO_SA5_SHIFT) |
                 adapter->addr[5];
        writel(sa_lo, &rxmac->sa_lo);

        sa_hi = (u32) (adapter->addr[0] << ET_WOL_HI_SA1_SHIFT) |
                       adapter->addr[1];
        writel(sa_hi, &rxmac->sa_hi);

        /* Disable all Packet Filtering */
        writel(0, &rxmac->pf_ctrl);

        /* Let's initialize the Unicast Packet filtering address */
        if (adapter->packet_filter & ET131X_PACKET_TYPE_DIRECTED) {
                et1310_setup_device_for_unicast(adapter);
                pf_ctrl |= 4;   /* Unicast filter */
        } else {
                writel(0, &rxmac->uni_pf_addr1);
                writel(0, &rxmac->uni_pf_addr2);
                writel(0, &rxmac->uni_pf_addr3);
        }

        /* Let's initialize the Multicast hash */
        if (!(adapter->packet_filter & ET131X_PACKET_TYPE_ALL_MULTICAST)) {
                pf_ctrl |= 2;   /* Multicast filter */
                et1310_setup_device_for_multicast(adapter);
        }

        /* Runt packet filtering.  Didn't work in version A silicon. */
        pf_ctrl |= (NIC_MIN_PACKET_SIZE + 4) << 16;
        pf_ctrl |= 8;   /* Fragment filter */

        if (adapter->registry_jumbo_packet > 8192)
                /* In order to transmit jumbo packets greater than 8k, the
                 * FIFO between RxMAC and RxDMA needs to be reduced in size
                 * to (16k - Jumbo packet size).  In order to implement this,
                 * we must use "cut through" mode in the RxMAC, which chops
                 * packets down into segments which are (max_size * 16).  In
                 * this case we selected 256 bytes, since this is the size of
                 * the PCI-Express TLP's that the 1310 uses.
                 *
                 * seg_en on, fc_en off, size 0x10
                 */
                writel(0x41, &rxmac->mcif_ctrl_max_seg);
        else
                writel(0, &rxmac->mcif_ctrl_max_seg);

        /* Initialize the MCIF water marks */
        writel(0, &rxmac->mcif_water_mark);

        /*  Initialize the MIF control */
        writel(0, &rxmac->mif_ctrl);

        /* Initialize the Space Available Register */
        writel(0, &rxmac->space_avail);

        /* Initialize the the mif_ctrl register
         * bit 3:  Receive code error. One or more nibbles were signaled as
         *         errors  during the reception of the packet.  Clear this
         *         bit in Gigabit, set it in 100Mbit.  This was derived
         *         experimentally at UNH.
         * bit 4:  Receive CRC error. The packet's CRC did not match the
         *         internally generated CRC.
         * bit 5:  Receive length check error. Indicates that frame length
         *         field value in the packet does not match the actual data
         *         byte length and is not a type field.
         * bit 16: Receive frame truncated.
         * bit 17: Drop packet enable
         */
        if (phydev && phydev->speed == SPEED_100)
                writel(0x30038, &rxmac->mif_ctrl);
        else
                writel(0x30030, &rxmac->mif_ctrl);

        /* Finally we initialize RxMac to be enabled & WOL disabled.  Packet
         * filter is always enabled since it is where the runt packets are
         * supposed to be dropped.  For version A silicon, runt packet
         * dropping doesn't work, so it is disabled in the pf_ctrl register,
         * but we still leave the packet filter on.
         */
        writel(pf_ctrl, &rxmac->pf_ctrl);
        writel(0x9, &rxmac->ctrl);
}

static void et1310_config_txmac_regs(struct et131x_adapter *adapter)
{
        struct txmac_regs __iomem *txmac = &adapter->regs->txmac;

        /* We need to update the Control Frame Parameters
         * cfpt - control frame pause timer set to 64 (0x40)
         * cfep - control frame extended pause timer set to 0x0
         */
        if (adapter->flowcontrol == FLOW_NONE)
                writel(0, &txmac->cf_param);
        else
                writel(0x40, &txmac->cf_param);
}

static void et1310_config_macstat_regs(struct et131x_adapter *adapter)
{
        struct macstat_regs __iomem *macstat =
                &adapter->regs->macstat;

        /* Next we need to initialize all the macstat registers to zero on
         * the device.
         */
        writel(0, &macstat->txrx_0_64_byte_frames);
        writel(0, &macstat->txrx_65_127_byte_frames);
        writel(0, &macstat->txrx_128_255_byte_frames);
        writel(0, &macstat->txrx_256_511_byte_frames);
        writel(0, &macstat->txrx_512_1023_byte_frames);
        writel(0, &macstat->txrx_1024_1518_byte_frames);
        writel(0, &macstat->txrx_1519_1522_gvln_frames);

        writel(0, &macstat->rx_bytes);
        writel(0, &macstat->rx_packets);
        writel(0, &macstat->rx_fcs_errs);
        writel(0, &macstat->rx_multicast_packets);
        writel(0, &macstat->rx_broadcast_packets);
        writel(0, &macstat->rx_control_frames);
        writel(0, &macstat->rx_pause_frames);
        writel(0, &macstat->rx_unknown_opcodes);
        writel(0, &macstat->rx_align_errs);
        writel(0, &macstat->rx_frame_len_errs);
        writel(0, &macstat->rx_code_errs);
        writel(0, &macstat->rx_carrier_sense_errs);
        writel(0, &macstat->rx_undersize_packets);
        writel(0, &macstat->rx_oversize_packets);
        writel(0, &macstat->rx_fragment_packets);
        writel(0, &macstat->rx_jabbers);
        writel(0, &macstat->rx_drops);

        writel(0, &macstat->tx_bytes);
        writel(0, &macstat->tx_packets);
        writel(0, &macstat->tx_multicast_packets);
        writel(0, &macstat->tx_broadcast_packets);
        writel(0, &macstat->tx_pause_frames);
        writel(0, &macstat->tx_deferred);
        writel(0, &macstat->tx_excessive_deferred);
        writel(0, &macstat->tx_single_collisions);
        writel(0, &macstat->tx_multiple_collisions);
        writel(0, &macstat->tx_late_collisions);
        writel(0, &macstat->tx_excessive_collisions);
        writel(0, &macstat->tx_total_collisions);
        writel(0, &macstat->tx_pause_honored_frames);
        writel(0, &macstat->tx_drops);
        writel(0, &macstat->tx_jabbers);
        writel(0, &macstat->tx_fcs_errs);
        writel(0, &macstat->tx_control_frames);
        writel(0, &macstat->tx_oversize_frames);
        writel(0, &macstat->tx_undersize_frames);
        writel(0, &macstat->tx_fragments);
        writel(0, &macstat->carry_reg1);
        writel(0, &macstat->carry_reg2);

        /* Unmask any counters that we want to track the overflow of.
         * Initially this will be all counters.  It may become clear later
         * that we do not need to track all counters.
         */
        writel(0xFFFFBE32, &macstat->carry_reg1_mask);
        writel(0xFFFE7E8B, &macstat->carry_reg2_mask);
}

/**
 * et131x_phy_mii_read - Read from the PHY through the MII Interface on the MAC
 * @adapter: pointer to our private adapter structure
 * @addr: the address of the transceiver
 * @reg: the register to read
 * @value: pointer to a 16-bit value in which the value will be stored
 *
 * Returns 0 on success, errno on failure (as defined in errno.h)
 */
static int et131x_phy_mii_read(struct et131x_adapter *adapter, u8 addr,
              u8 reg, u16 *value)
{
        struct mac_regs __iomem *mac = &adapter->regs->mac;
        int status = 0;
        u32 delay = 0;
        u32 mii_addr;
        u32 mii_cmd;
        u32 mii_indicator;

        /* Save a local copy of the registers we are dealing with so we can
         * set them back
         */
        mii_addr = readl(&mac->mii_mgmt_addr);
        mii_cmd = readl(&mac->mii_mgmt_cmd);

        /* Stop the current operation */
        writel(0, &mac->mii_mgmt_cmd);

        /* Set up the register we need to read from on the correct PHY */
        writel(MII_ADDR(addr, reg), &mac->mii_mgmt_addr);

        writel(0x1, &mac->mii_mgmt_cmd);

        do {
                udelay(50);
                delay++;
                mii_indicator = readl(&mac->mii_mgmt_indicator);
        } while ((mii_indicator & MGMT_WAIT) && delay < 50);

        /* If we hit the max delay, we could not read the register */
        if (delay == 50) {
                dev_warn(&adapter->pdev->dev,
                            "reg 0x%08x could not be read\n", reg);
                dev_warn(&adapter->pdev->dev, "status is  0x%08x\n",
                            mii_indicator);

                status = -EIO;
        }

        /* If we hit here we were able to read the register and we need to
         * return the value to the caller */
        *value = readl(&mac->mii_mgmt_stat) & 0xFFFF;

        /* Stop the read operation */
        writel(0, &mac->mii_mgmt_cmd);

        /* set the registers we touched back to the state at which we entered
         * this function
         */
        writel(mii_addr, &mac->mii_mgmt_addr);
        writel(mii_cmd, &mac->mii_mgmt_cmd);

        return status;
}

static int et131x_mii_read(struct et131x_adapter *adapter, u8 reg, u16 *value)
{
        struct phy_device *phydev = adapter->phydev;

        if (!phydev)
                return -EIO;

        return et131x_phy_mii_read(adapter, phydev->addr, reg, value);
}

/**
 * et131x_mii_write - Write to a PHY register through the MII interface of the MAC
 * @adapter: pointer to our private adapter structure
 * @reg: the register to read
 * @value: 16-bit value to write
 *
 * FIXME: one caller in netdev still
 *
 * Return 0 on success, errno on failure (as defined in errno.h)
 */
static int et131x_mii_write(struct et131x_adapter *adapter, u8 reg, u16 value)
{
        struct mac_regs __iomem *mac = &adapter->regs->mac;
        struct phy_device *phydev = adapter->phydev;
        int status = 0;
        u8 addr;
        u32 delay = 0;
        u32 mii_addr;
        u32 mii_cmd;
        u32 mii_indicator;

        if (!phydev)
                return -EIO;

        addr = phydev->addr;

        /* Save a local copy of the registers we are dealing with so we can
         * set them back
         */
        mii_addr = readl(&mac->mii_mgmt_addr);
        mii_cmd = readl(&mac->mii_mgmt_cmd);

        /* Stop the current operation */
        writel(0, &mac->mii_mgmt_cmd);

        /* Set up the register we need to write to on the correct PHY */
        writel(MII_ADDR(addr, reg), &mac->mii_mgmt_addr);

        /* Add the value to write to the registers to the mac */
        writel(value, &mac->mii_mgmt_ctrl);

        do {
                udelay(50);
                delay++;
                mii_indicator = readl(&mac->mii_mgmt_indicator);
        } while ((mii_indicator & MGMT_BUSY) && delay < 100);

        /* If we hit the max delay, we could not write the register */
        if (delay == 100) {
                u16 tmp;

                dev_warn(&adapter->pdev->dev,
                    "reg 0x%08x could not be written", reg);
                dev_warn(&adapter->pdev->dev, "status is  0x%08x\n",
                            mii_indicator);
                dev_warn(&adapter->pdev->dev, "command is  0x%08x\n",
                            readl(&mac->mii_mgmt_cmd));

                et131x_mii_read(adapter, reg, &tmp);

                status = -EIO;
        }
        /* Stop the write operation */
        writel(0, &mac->mii_mgmt_cmd);

        /*
         * set the registers we touched back to the state at which we entered
         * this function
         */
        writel(mii_addr, &mac->mii_mgmt_addr);
        writel(mii_cmd, &mac->mii_mgmt_cmd);

        return status;
}

/* Still used from _mac for BIT_READ */
static void et1310_phy_access_mii_bit(struct et131x_adapter *adapter,
                                      u16 action, u16 regnum, u16 bitnum,
                                      u8 *value)
{
        u16 reg;
        u16 mask = 0x0001 << bitnum;

        /* Read the requested register */
        et131x_mii_read(adapter, regnum, &reg);

        switch (action) {
        case TRUEPHY_BIT_READ:
                *value = (reg & mask) >> bitnum;
                break;

        case TRUEPHY_BIT_SET:
                et131x_mii_write(adapter, regnum, reg | mask);
                break;

        case TRUEPHY_BIT_CLEAR:
                et131x_mii_write(adapter, regnum, reg & ~mask);
                break;

        default:
                break;
        }
}

static void et1310_config_flow_control(struct et131x_adapter *adapter)
{
        struct phy_device *phydev = adapter->phydev;

        if (phydev->duplex == DUPLEX_HALF) {
                adapter->flowcontrol = FLOW_NONE;
        } else {
                char remote_pause, remote_async_pause;

                et1310_phy_access_mii_bit(adapter,
                                TRUEPHY_BIT_READ, 5, 10, &remote_pause);
                et1310_phy_access_mii_bit(adapter,
                                TRUEPHY_BIT_READ, 5, 11,
                                &remote_async_pause);

                if ((remote_pause == TRUEPHY_BIT_SET) &&
                    (remote_async_pause == TRUEPHY_BIT_SET)) {
                        adapter->flowcontrol = adapter->wanted_flow;
                } else if ((remote_pause == TRUEPHY_BIT_SET) &&
                           (remote_async_pause == TRUEPHY_BIT_CLEAR)) {
                        if (adapter->wanted_flow == FLOW_BOTH)
                                adapter->flowcontrol = FLOW_BOTH;
                        else
                                adapter->flowcontrol = FLOW_NONE;
                } else if ((remote_pause == TRUEPHY_BIT_CLEAR) &&
                           (remote_async_pause == TRUEPHY_BIT_CLEAR)) {
                        adapter->flowcontrol = FLOW_NONE;
                } else {/* if (remote_pause == TRUEPHY_CLEAR_BIT &&
                               remote_async_pause == TRUEPHY_SET_BIT) */
                        if (adapter->wanted_flow == FLOW_BOTH)
                                adapter->flowcontrol = FLOW_RXONLY;
                        else
                                adapter->flowcontrol = FLOW_NONE;
                }
        }
}

/**
 * et1310_update_macstat_host_counters - Update the local copy of the statistics
 * @adapter: pointer to the adapter structure
 */
static void et1310_update_macstat_host_counters(struct et131x_adapter *adapter)
{
        struct ce_stats *stats = &adapter->stats;
        struct macstat_regs __iomem *macstat =
                &adapter->regs->macstat;

        stats->tx_collisions           += readl(&macstat->tx_total_collisions);
        stats->tx_first_collisions     += readl(&macstat->tx_single_collisions);
        stats->tx_deferred             += readl(&macstat->tx_deferred);
        stats->tx_excessive_collisions +=
                                readl(&macstat->tx_multiple_collisions);
        stats->tx_late_collisions      += readl(&macstat->tx_late_collisions);
        stats->tx_underflows           += readl(&macstat->tx_undersize_frames);
        stats->tx_max_pkt_errs         += readl(&macstat->tx_oversize_frames);

        stats->rx_align_errs        += readl(&macstat->rx_align_errs);
        stats->rx_crc_errs          += readl(&macstat->rx_code_errs);
        stats->rcvd_pkts_dropped    += readl(&macstat->rx_drops);
        stats->rx_overflows         += readl(&macstat->rx_oversize_packets);
        stats->rx_code_violations   += readl(&macstat->rx_fcs_errs);
        stats->rx_length_errs       += readl(&macstat->rx_frame_len_errs);
        stats->rx_other_errs        += readl(&macstat->rx_fragment_packets);
}

/**
 * et1310_handle_macstat_interrupt
 * @adapter: pointer to the adapter structure
 *
 * One of the MACSTAT counters has wrapped.  Update the local copy of
 * the statistics held in the adapter structure, checking the "wrap"
 * bit for each counter.
 */
static void et1310_handle_macstat_interrupt(struct et131x_adapter *adapter)
{
        u32 carry_reg1;
        u32 carry_reg2;

        /* Read the interrupt bits from the register(s).  These are Clear On
         * Write.
         */
        carry_reg1 = readl(&adapter->regs->macstat.carry_reg1);
        carry_reg2 = readl(&adapter->regs->macstat.carry_reg2);

        writel(carry_reg1, &adapter->regs->macstat.carry_reg1);
        writel(carry_reg2, &adapter->regs->macstat.carry_reg2);

        /* We need to do update the host copy of all the MAC_STAT counters.
         * For each counter, check it's overflow bit.  If the overflow bit is
         * set, then increment the host version of the count by one complete
         * revolution of the counter.  This routine is called when the counter
         * block indicates that one of the counters has wrapped.
         */
        if (carry_reg1 & (1 << 14))
                adapter->stats.rx_code_violations       += COUNTER_WRAP_16_BIT;
        if (carry_reg1 & (1 << 8))
                adapter->stats.rx_align_errs    += COUNTER_WRAP_12_BIT;
        if (carry_reg1 & (1 << 7))
                adapter->stats.rx_length_errs   += COUNTER_WRAP_16_BIT;
        if (carry_reg1 & (1 << 2))
                adapter->stats.rx_other_errs    += COUNTER_WRAP_16_BIT;
        if (carry_reg1 & (1 << 6))
                adapter->stats.rx_crc_errs      += COUNTER_WRAP_16_BIT;
        if (carry_reg1 & (1 << 3))
                adapter->stats.rx_overflows     += COUNTER_WRAP_16_BIT;
        if (carry_reg1 & (1 << 0))
                adapter->stats.rcvd_pkts_dropped        += COUNTER_WRAP_16_BIT;
        if (carry_reg2 & (1 << 16))
                adapter->stats.tx_max_pkt_errs  += COUNTER_WRAP_12_BIT;
        if (carry_reg2 & (1 << 15))
                adapter->stats.tx_underflows    += COUNTER_WRAP_12_BIT;
        if (carry_reg2 & (1 << 6))
                adapter->stats.tx_first_collisions += COUNTER_WRAP_12_BIT;
        if (carry_reg2 & (1 << 8))
                adapter->stats.tx_deferred      += COUNTER_WRAP_12_BIT;
        if (carry_reg2 & (1 << 5))
                adapter->stats.tx_excessive_collisions += COUNTER_WRAP_12_BIT;
        if (carry_reg2 & (1 << 4))
                adapter->stats.tx_late_collisions       += COUNTER_WRAP_12_BIT;
        if (carry_reg2 & (1 << 2))
                adapter->stats.tx_collisions    += COUNTER_WRAP_12_BIT;
}

static int et131x_mdio_read(struct mii_bus *bus, int phy_addr, int reg)
{
        struct net_device *netdev = bus->priv;
        struct et131x_adapter *adapter = netdev_priv(netdev);
        u16 value;
        int ret;

        ret = et131x_phy_mii_read(adapter, phy_addr, reg, &value);

        if (ret < 0)
                return ret;
        else
                return value;
}

static int et131x_mdio_write(struct mii_bus *bus, int phy_addr,
                             int reg, u16 value)
{
        struct net_device *netdev = bus->priv;
        struct et131x_adapter *adapter = netdev_priv(netdev);

        return et131x_mii_write(adapter, reg, value);
}

static int et131x_mdio_reset(struct mii_bus *bus)
{
        struct net_device *netdev = bus->priv;
        struct et131x_adapter *adapter = netdev_priv(netdev);

        et131x_mii_write(adapter, MII_BMCR, BMCR_RESET);

        return 0;
}

/**
 *      et1310_phy_power_down   -       PHY power control
 *      @adapter: device to control
 *      @down: true for off/false for back on
 *
 *      one hundred, ten, one thousand megs
 *      How would you like to have your LAN accessed
 *      Can't you see that this code processed
 *      Phy power, phy power..
 */
static void et1310_phy_power_down(struct et131x_adapter *adapter, bool down)
{
        u16 data;

        et131x_mii_read(adapter, MII_BMCR, &data);
        data &= ~BMCR_PDOWN;
        if (down)
                data |= BMCR_PDOWN;
        et131x_mii_write(adapter, MII_BMCR, data);
}

/**
 * et131x_xcvr_init - Init the phy if we are setting it into force mode
 * @adapter: pointer to our private adapter structure
 *
 */
static void et131x_xcvr_init(struct et131x_adapter *adapter)
{
        u16 imr;
        u16 isr;
        u16 lcr2;

        et131x_mii_read(adapter, PHY_INTERRUPT_STATUS, &isr);
        et131x_mii_read(adapter, PHY_INTERRUPT_MASK, &imr);

        /* Set the link status interrupt only.  Bad behavior when link status
         * and auto neg are set, we run into a nested interrupt problem
         */
        imr |= (ET_PHY_INT_MASK_AUTONEGSTAT |
                ET_PHY_INT_MASK_LINKSTAT |
                ET_PHY_INT_MASK_ENABLE);

        et131x_mii_write(adapter, PHY_INTERRUPT_MASK, imr);

        /* Set the LED behavior such that LED 1 indicates speed (off =
         * 10Mbits, blink = 100Mbits, on = 1000Mbits) and LED 2 indicates
         * link and activity (on for link, blink off for activity).
         *
         * NOTE: Some customizations have been added here for specific
         * vendors; The LED behavior is now determined by vendor data in the
         * EEPROM. However, the above description is the default.
         */
        if ((adapter->eeprom_data[1] & 0x4) == 0) {
                et131x_mii_read(adapter, PHY_LED_2, &lcr2);

                lcr2 &= (ET_LED2_LED_100TX | ET_LED2_LED_1000T);
                lcr2 |= (LED_VAL_LINKON_ACTIVE << LED_LINK_SHIFT);

                if ((adapter->eeprom_data[1] & 0x8) == 0)
                        lcr2 |= (LED_VAL_1000BT_100BTX << LED_TXRX_SHIFT);
                else
                        lcr2 |= (LED_VAL_LINKON << LED_TXRX_SHIFT);

                et131x_mii_write(adapter, PHY_LED_2, lcr2);
        }
}

/**
 * et131x_configure_global_regs -       configure JAGCore global regs
 * @adapter: pointer to our adapter structure
 *
 * Used to configure the global registers on the JAGCore
 */
static void et131x_configure_global_regs(struct et131x_adapter *adapter)
{
        struct global_regs __iomem *regs = &adapter->regs->global;

        writel(0, &regs->rxq_start_addr);
        writel(INTERNAL_MEM_SIZE - 1, &regs->txq_end_addr);

        if (adapter->registry_jumbo_packet < 2048) {
                /* Tx / RxDMA and Tx/Rx MAC interfaces have a 1k word
                 * block of RAM that the driver can split between Tx
                 * and Rx as it desires.  Our default is to split it
                 * 50/50:
                 */
                writel(PARM_RX_MEM_END_DEF, &regs->rxq_end_addr);
                writel(PARM_RX_MEM_END_DEF + 1, &regs->txq_start_addr);
        } else if (adapter->registry_jumbo_packet < 8192) {
                /* For jumbo packets > 2k but < 8k, split 50-50. */
                writel(INTERNAL_MEM_RX_OFFSET, &regs->rxq_end_addr);
                writel(INTERNAL_MEM_RX_OFFSET + 1, &regs->txq_start_addr);
        } else {
                /* 9216 is the only packet size greater than 8k that
                 * is available. The Tx buffer has to be big enough
                 * for one whole packet on the Tx side. We'll make
                 * the Tx 9408, and give the rest to Rx
                 */
                writel(0x01b3, &regs->rxq_end_addr);
                writel(0x01b4, &regs->txq_start_addr);
        }

        /* Initialize the loopback register. Disable all loopbacks. */
        writel(0, &regs->loopback);

        /* MSI Register */
        writel(0, &regs->msi_config);

        /* By default, disable the watchdog timer.  It will be enabled when
         * a packet is queued.
         */
        writel(0, &regs->watchdog_timer);
}

/**
 * et131x_config_rx_dma_regs - Start of Rx_DMA init sequence
 * @adapter: pointer to our adapter structure
 */
static void et131x_config_rx_dma_regs(struct et131x_adapter *adapter)
{
        struct rxdma_regs __iomem *rx_dma = &adapter->regs->rxdma;
        struct rx_ring *rx_local = &adapter->rx_ring;
        struct fbr_desc *fbr_entry;
        u32 entry;
        u32 psr_num_des;
        unsigned long flags;

        /* Halt RXDMA to perform the reconfigure.  */
        et131x_rx_dma_disable(adapter);

        /* Load the completion writeback physical address
         *
         * NOTE : dma_alloc_coherent(), used above to alloc DMA regions,
         * ALWAYS returns SAC (32-bit) addresses. If DAC (64-bit) addresses
         * are ever returned, make sure the high part is retrieved here
         * before storing the adjusted address.
         */
        writel((u32) ((u64)rx_local->rx_status_bus >> 32),
               &rx_dma->dma_wb_base_hi);
        writel((u32) rx_local->rx_status_bus, &rx_dma->dma_wb_base_lo);

        memset(rx_local->rx_status_block, 0, sizeof(struct rx_status_block));

        /* Set the address and parameters of the packet status ring into the
         * 1310's registers
         */
        writel((u32) ((u64)rx_local->ps_ring_physaddr >> 32),
               &rx_dma->psr_base_hi);
        writel((u32) rx_local->ps_ring_physaddr, &rx_dma->psr_base_lo);
        writel(rx_local->psr_num_entries - 1, &rx_dma->psr_num_des);
        writel(0, &rx_dma->psr_full_offset);

        psr_num_des = readl(&rx_dma->psr_num_des) & 0xFFF;
        writel((psr_num_des * LO_MARK_PERCENT_FOR_PSR) / 100,
               &rx_dma->psr_min_des);

        spin_lock_irqsave(&adapter->rcv_lock, flags);

        /* These local variables track the PSR in the adapter structure */
        rx_local->local_psr_full = 0;

        /* Now's the best time to initialize FBR1 contents */
        fbr_entry = (struct fbr_desc *) rx_local->fbr[0]->ring_virtaddr;
        for (entry = 0; entry < rx_local->fbr[0]->num_entries; entry++) {
                fbr_entry->addr_hi = rx_local->fbr[0]->bus_high[entry];
                fbr_entry->addr_lo = rx_local->fbr[0]->bus_low[entry];
                fbr_entry->word2 = entry;
                fbr_entry++;
        }

        /* Set the address and parameters of Free buffer ring 1 (and 0 if
         * required) into the 1310's registers
         */
        writel((u32) (rx_local->fbr[0]->real_physaddr >> 32),
               &rx_dma->fbr1_base_hi);
        writel((u32) rx_local->fbr[0]->real_physaddr, &rx_dma->fbr1_base_lo);
        writel(rx_local->fbr[0]->num_entries - 1, &rx_dma->fbr1_num_des);
        writel(ET_DMA10_WRAP, &rx_dma->fbr1_full_offset);

        /* This variable tracks the free buffer ring 1 full position, so it
         * has to match the above.
         */
        rx_local->fbr[0]->local_full = ET_DMA10_WRAP;
        writel(
           ((rx_local->fbr[0]->num_entries * LO_MARK_PERCENT_FOR_RX) / 100) - 1,
           &rx_dma->fbr1_min_des);

#ifdef USE_FBR0
        /* Now's the best time to initialize FBR0 contents */
        fbr_entry = (struct fbr_desc *) rx_local->fbr[1]->ring_virtaddr;
        for (entry = 0; entry < rx_local->fbr[1]->num_entries; entry++) {
                fbr_entry->addr_hi = rx_local->fbr[1]->bus_high[entry];
                fbr_entry->addr_lo = rx_local->fbr[1]->bus_low[entry];
                fbr_entry->word2 = entry;
                fbr_entry++;
        }

        writel((u32) (rx_local->fbr[1]->real_physaddr >> 32),
               &rx_dma->fbr0_base_hi);
        writel((u32) rx_local->fbr[1]->real_physaddr, &rx_dma->fbr0_base_lo);
        writel(rx_local->fbr[1]->num_entries - 1, &rx_dma->fbr0_num_des);
        writel(ET_DMA10_WRAP, &rx_dma->fbr0_full_offset);

        /* This variable tracks the free buffer ring 0 full position, so it
         * has to match the above.
         */
        rx_local->fbr[1]->local_full = ET_DMA10_WRAP;
        writel(
           ((rx_local->fbr[1]->num_entries * LO_MARK_PERCENT_FOR_RX) / 100) - 1,
           &rx_dma->fbr0_min_des);
#endif

        /* Program the number of packets we will receive before generating an
         * interrupt.
         * For version B silicon, this value gets updated once autoneg is
         *complete.
         */
        writel(PARM_RX_NUM_BUFS_DEF, &rx_dma->num_pkt_done);

        /* The "time_done" is not working correctly to coalesce interrupts
         * after a given time period, but rather is giving us an interrupt
         * regardless of whether we have received packets.
         * This value gets updated once autoneg is complete.
         */
        writel(PARM_RX_TIME_INT_DEF, &rx_dma->max_pkt_time);

        spin_unlock_irqrestore(&adapter->rcv_lock, flags);
}

/**
 * et131x_config_tx_dma_regs - Set up the tx dma section of the JAGCore.
 * @adapter: pointer to our private adapter structure
 *
 * Configure the transmit engine with the ring buffers we have created
 * and prepare it for use.
 */
static void et131x_config_tx_dma_regs(struct et131x_adapter *adapter)
{
        struct txdma_regs __iomem *txdma = &adapter->regs->txdma;

        /* Load the hardware with the start of the transmit descriptor ring. */
        writel((u32) ((u64)adapter->tx_ring.tx_desc_ring_pa >> 32),
               &txdma->pr_base_hi);
        writel((u32) adapter->tx_ring.tx_desc_ring_pa,
               &txdma->pr_base_lo);

        /* Initialise the transmit DMA engine */
        writel(NUM_DESC_PER_RING_TX - 1, &txdma->pr_num_des);

        /* Load the completion writeback physical address */
        writel((u32)((u64)adapter->tx_ring.tx_status_pa >> 32),
                                                &txdma->dma_wb_base_hi);
        writel((u32)adapter->tx_ring.tx_status_pa, &txdma->dma_wb_base_lo);

        *adapter->tx_ring.tx_status = 0;

        writel(0, &txdma->service_request);
        adapter->tx_ring.send_idx = 0;
}

/**
 * et131x_adapter_setup - Set the adapter up as per cassini+ documentation
 * @adapter: pointer to our private adapter structure
 *
 * Returns 0 on success, errno on failure (as defined in errno.h)
 */
static void et131x_adapter_setup(struct et131x_adapter *adapter)
{

        /* Configure the JAGCore */
        et131x_configure_global_regs(adapter);

        et1310_config_mac_regs1(adapter);

        /* Configure the MMC registers */
        /* All we need to do is initialize the Memory Control Register */
        writel(ET_MMC_ENABLE, &adapter->regs->mmc.mmc_ctrl);

        et1310_config_rxmac_regs(adapter);
        et1310_config_txmac_regs(adapter);

        et131x_config_rx_dma_regs(adapter);
        et131x_config_tx_dma_regs(adapter);

        et1310_config_macstat_regs(adapter);

        et1310_phy_power_down(adapter, 0);
        et131x_xcvr_init(adapter);
}

/**
 * et131x_soft_reset - Issue a soft reset to the hardware, complete for ET1310
 * @adapter: pointer to our private adapter structure
 */
static void et131x_soft_reset(struct et131x_adapter *adapter)
{
        /* Disable MAC Core */
        writel(0xc00f0000, &adapter->regs->mac.cfg1);

        /* Set everything to a reset value */
        writel(0x7F, &adapter->regs->global.sw_reset);
        writel(0x000f0000, &adapter->regs->mac.cfg1);
        writel(0x00000000, &adapter->regs->mac.cfg1);
}

/**
 *      et131x_enable_interrupts        -       enable interrupt
 *      @adapter: et131x device
 *
 *      Enable the appropriate interrupts on the ET131x according to our
 *      configuration
 */
static void et131x_enable_interrupts(struct et131x_adapter *adapter)
{
        u32 mask;

        /* Enable all global interrupts */
        if (adapter->flowcontrol == FLOW_TXONLY ||
                            adapter->flowcontrol == FLOW_BOTH)
                mask = INT_MASK_ENABLE;
        else
                mask = INT_MASK_ENABLE_NO_FLOW;

        writel(mask, &adapter->regs->global.int_mask);
}

/**
 *      et131x_disable_interrupts       -       interrupt disable
 *      @adapter: et131x device
 *
 *      Block all interrupts from the et131x device at the device itself
 */
static void et131x_disable_interrupts(struct et131x_adapter *adapter)
{
        /* Disable all global interrupts */
        writel(INT_MASK_DISABLE, &adapter->regs->global.int_mask);
}

/**
 * et131x_tx_dma_disable - Stop of Tx_DMA on the ET1310
 * @adapter: pointer to our adapter structure
 */
static void et131x_tx_dma_disable(struct et131x_adapter *adapter)
{
        /* Setup the tramsmit dma configuration register */
        writel(ET_TXDMA_CSR_HALT|ET_TXDMA_SNGL_EPKT,
                                        &adapter->regs->txdma.csr);
}

/**
 * et131x_enable_txrx - Enable tx/rx queues
 * @netdev: device to be enabled
 */
static void et131x_enable_txrx(struct net_device *netdev)
{
        struct et131x_adapter *adapter = netdev_priv(netdev);

        /* Enable the Tx and Rx DMA engines (if not already enabled) */
        et131x_rx_dma_enable(adapter);
        et131x_tx_dma_enable(adapter);

        /* Enable device interrupts */
        if (adapter->flags & fMP_ADAPTER_INTERRUPT_IN_USE)
                et131x_enable_interrupts(adapter);

        /* We're ready to move some data, so start the queue */
        netif_start_queue(netdev);
}

/**
 * et131x_disable_txrx - Disable tx/rx queues
 * @netdev: device to be disabled
 */
static void et131x_disable_txrx(struct net_device *netdev)
{
        struct et131x_adapter *adapter = netdev_priv(netdev);

        /* First thing is to stop the queue */
        netif_stop_queue(netdev);

        /* Stop the Tx and Rx DMA engines */
        et131x_rx_dma_disable(adapter);
        et131x_tx_dma_disable(adapter);

        /* Disable device interrupts */
        et131x_disable_interrupts(adapter);
}

/**
 * et131x_init_send - Initialize send data structures
 * @adapter: pointer to our private adapter structure
 */
static void et131x_init_send(struct et131x_adapter *adapter)
{
        struct tcb *tcb;
        u32 ct;
        struct tx_ring *tx_ring;

        /* Setup some convenience pointers */
        tx_ring = &adapter->tx_ring;
        tcb = adapter->tx_ring.tcb_ring;

        tx_ring->tcb_qhead = tcb;

        memset(tcb, 0, sizeof(struct tcb) * NUM_TCB);

        /* Go through and set up each TCB */
        for (ct = 0; ct++ < NUM_TCB; tcb++)
                /* Set the link pointer in HW TCB to the next TCB in the
                 * chain
                 */
                tcb->next = tcb + 1;

        /* Set the  tail pointer */
        tcb--;
        tx_ring->tcb_qtail = tcb;
        tcb->next = NULL;
        /* Curr send queue should now be empty */
        tx_ring->send_head = NULL;
        tx_ring->send_tail = NULL;
}

/**
 * et1310_enable_phy_coma - called when network cable is unplugged
 * @adapter: pointer to our adapter structure
 *
 * driver receive an phy status change interrupt while in D0 and check that
 * phy_status is down.
 *
 *          -- gate off JAGCore;
 *          -- set gigE PHY in Coma mode
 *          -- wake on phy_interrupt; Perform software reset JAGCore,
 *             re-initialize jagcore and gigE PHY
 *
 *      Add D0-ASPM-PhyLinkDown Support:
 *          -- while in D0, when there is a phy_interrupt indicating phy link
 *             down status, call the MPSetPhyComa routine to enter this active
 *             state power saving mode
 *          -- while in D0-ASPM-PhyLinkDown mode, when there is a phy_interrupt
 *       indicating linkup status, call the MPDisablePhyComa routine to
 *             restore JAGCore and gigE PHY
 */
static void et1310_enable_phy_coma(struct et131x_adapter *adapter)
{
        unsigned long flags;
        u32 pmcsr;

        pmcsr = readl(&adapter->regs->global.pm_csr);

        /* Save the GbE PHY speed and duplex modes. Need to restore this
         * when cable is plugged back in
         */
        /*
         * TODO - when PM is re-enabled, check if we need to
         * perform a similar task as this -
         * adapter->pdown_speed = adapter->ai_force_speed;
         * adapter->pdown_duplex = adapter->ai_force_duplex;
         */

        /* Stop sending packets. */
        spin_lock_irqsave(&adapter->send_hw_lock, flags);
        adapter->flags |= fMP_ADAPTER_LOWER_POWER;
        spin_unlock_irqrestore(&adapter->send_hw_lock, flags);

        /* Wait for outstanding Receive packets */

        et131x_disable_txrx(adapter->netdev);

        /* Gate off JAGCore 3 clock domains */
        pmcsr &= ~ET_PMCSR_INIT;
        writel(pmcsr, &adapter->regs->global.pm_csr);

        /* Program gigE PHY in to Coma mode */
        pmcsr |= ET_PM_PHY_SW_COMA;
        writel(pmcsr, &adapter->regs->global.pm_csr);
}

/**
 * et1310_disable_phy_coma - Disable the Phy Coma Mode
 * @adapter: pointer to our adapter structure
 */
static void et1310_disable_phy_coma(struct et131x_adapter *adapter)
{
        u32 pmcsr;

        pmcsr = readl(&adapter->regs->global.pm_csr);

        /* Disable phy_sw_coma register and re-enable JAGCore clocks */
        pmcsr |= ET_PMCSR_INIT;
        pmcsr &= ~ET_PM_PHY_SW_COMA;
        writel(pmcsr, &adapter->regs->global.pm_csr);

        /* Restore the GbE PHY speed and duplex modes;
         * Reset JAGCore; re-configure and initialize JAGCore and gigE PHY
         */
        /* TODO - when PM is re-enabled, check if we need to
         * perform a similar task as this -
         * adapter->ai_force_speed = adapter->pdown_speed;
         * adapter->ai_force_duplex = adapter->pdown_duplex;
         */

        /* Re-initialize the send structures */
        et131x_init_send(adapter);

        /* Bring the device back to the state it was during init prior to
         * autonegotiation being complete.  This way, when we get the auto-neg
         * complete interrupt, we can complete init by calling ConfigMacREGS2.
         */
        et131x_soft_reset(adapter);

        /* setup et1310 as per the documentation ?? */
        et131x_adapter_setup(adapter);

        /* Allow Tx to restart */
        adapter->flags &= ~fMP_ADAPTER_LOWER_POWER;

        et131x_enable_txrx(adapter->netdev);
}

static inline u32 bump_free_buff_ring(u32 *free_buff_ring, u32 limit)
{
        u32 tmp_free_buff_ring = *free_buff_ring;
        tmp_free_buff_ring++;
        /* This works for all cases where limit < 1024. The 1023 case
           works because 1023++ is 1024 which means the if condition is not
           taken but the carry of the bit into the wrap bit toggles the wrap
           value correctly */
        if ((tmp_free_buff_ring & ET_DMA10_MASK) > limit) {
                tmp_free_buff_ring &= ~ET_DMA10_MASK;
                tmp_free_buff_ring ^= ET_DMA10_WRAP;
        }
        /* For the 1023 case */
        tmp_free_buff_ring &= (ET_DMA10_MASK|ET_DMA10_WRAP);
        *free_buff_ring = tmp_free_buff_ring;
        return tmp_free_buff_ring;
}

/**
 * et131x_align_allocated_memory - Align allocated memory on a given boundary
 * @adapter: pointer to our adapter structure
 * @phys_addr: pointer to Physical address
 * @offset: pointer to the offset variable
 * @mask: correct mask
 */
static void et131x_align_allocated_memory(struct et131x_adapter *adapter,
                                          u64 *phys_addr, u64 *offset,
                                          u64 mask)
{
        u64 new_addr = *phys_addr & ~mask;

        *offset = 0;

        if (new_addr != *phys_addr) {
                /* Move to next aligned block */
                new_addr += mask + 1;
                /* Return offset for adjusting virt addr */
                *offset = new_addr - *phys_addr;
                /* Return new physical address */
                *phys_addr = new_addr;
        }
}

/**
 * et131x_rx_dma_memory_alloc
 * @adapter: pointer to our private adapter structure
 *
 * Returns 0 on success and errno on failure (as defined in errno.h)
 *
 * Allocates Free buffer ring 1 for sure, free buffer ring 0 if required,
 * and the Packet Status Ring.
 */
static int et131x_rx_dma_memory_alloc(struct et131x_adapter *adapter)
{
        u32 i, j;
        u32 bufsize;
        u32 pktstat_ringsize, fbr_chunksize;
        struct rx_ring *rx_ring;

        /* Setup some convenience pointers */
        rx_ring = &adapter->rx_ring;

        /* Alloc memory for the lookup table */
#ifdef USE_FBR0
        rx_ring->fbr[1] = kmalloc(sizeof(struct fbr_lookup), GFP_KERNEL);
#endif
        rx_ring->fbr[0] = kmalloc(sizeof(struct fbr_lookup), GFP_KERNEL);

        /* The first thing we will do is configure the sizes of the buffer
         * rings. These will change based on jumbo packet support.  Larger
         * jumbo packets increases the size of each entry in FBR0, and the
         * number of entries in FBR0, while at the same time decreasing the
         * number of entries in FBR1.
         *
         * FBR1 holds "large" frames, FBR0 holds "small" frames.  If FBR1
         * entries are huge in order to accommodate a "jumbo" frame, then it
         * will have less entries.  Conversely, FBR1 will now be relied upon
         * to carry more "normal" frames, thus it's entry size also increases
         * and the number of entries goes up too (since it now carries
         * "small" + "regular" packets.
         *
         * In this scheme, we try to maintain 512 entries between the two
         * rings. Also, FBR1 remains a constant size - when it's size doubles
         * the number of entries halves.  FBR0 increases in size, however.
         */

        if (adapter->registry_jumbo_packet < 2048) {
#ifdef USE_FBR0
                rx_ring->fbr[1]->buffsize = 256;
                rx_ring->fbr[1]->num_entries = 512;
#endif
                rx_ring->fbr[0]->buffsize = 2048;
                rx_ring->fbr[0]->num_entries = 512;
        } else if (adapter->registry_jumbo_packet < 4096) {
#ifdef USE_FBR0
                rx_ring->fbr[1]->buffsize = 512;
                rx_ring->fbr[1]->num_entries = 1024;
#endif
                rx_ring->fbr[0]->buffsize = 4096;
                rx_ring->fbr[0]->num_entries = 512;
        } else {
#ifdef USE_FBR0
                rx_ring->fbr[1]->buffsize = 1024;
                rx_ring->fbr[1]->num_entries = 768;
#endif
                rx_ring->fbr[0]->buffsize = 16384;
                rx_ring->fbr[0]->num_entries = 128;
        }

#ifdef USE_FBR0
        adapter->rx_ring.psr_num_entries =
                                adapter->rx_ring.fbr[1]->num_entries +
                                adapter->rx_ring.fbr[0]->num_entries;
#else
        adapter->rx_ring.psr_num_entries = adapter->rx_ring.fbr[0]->num_entries;
#endif

        /* Allocate an area of memory for Free Buffer Ring 1 */
        bufsize = (sizeof(struct fbr_desc) * rx_ring->fbr[0]->num_entries) +
                                                                        0xfff;
        rx_ring->fbr[0]->ring_virtaddr = dma_alloc_coherent(&adapter->pdev->dev,
                                        bufsize,
                                        &rx_ring->fbr[0]->ring_physaddr,
                                        GFP_KERNEL);
        if (!rx_ring->fbr[0]->ring_virtaddr) {
                dev_err(&adapter->pdev->dev,
                          "Cannot alloc memory for Free Buffer Ring 1\n");
                return -ENOMEM;
        }

        /* Save physical address
         *
         * NOTE: dma_alloc_coherent(), used above to alloc DMA regions,
         * ALWAYS returns SAC (32-bit) addresses. If DAC (64-bit) addresses
         * are ever returned, make sure the high part is retrieved here
         * before storing the adjusted address.
         */
        rx_ring->fbr[0]->real_physaddr = rx_ring->fbr[0]->ring_physaddr;

        /* Align Free Buffer Ring 1 on a 4K boundary */
        et131x_align_allocated_memory(adapter,
                                      &rx_ring->fbr[0]->real_physaddr,
                                      &rx_ring->fbr[0]->offset, 0x0FFF);

        rx_ring->fbr[0]->ring_virtaddr =
                        (void *)((u8 *) rx_ring->fbr[0]->ring_virtaddr +
                        rx_ring->fbr[0]->offset);

#ifdef USE_FBR0
        /* Allocate an area of memory for Free Buffer Ring 0 */
        bufsize = (sizeof(struct fbr_desc) * rx_ring->fbr[1]->num_entries) +
                                                                        0xfff;
        rx_ring->fbr[1]->ring_virtaddr = dma_alloc_coherent(&adapter->pdev->dev,
                                                bufsize,
                                                &rx_ring->fbr[1]->ring_physaddr,
                                                GFP_KERNEL);
        if (!rx_ring->fbr[1]->ring_virtaddr) {
                dev_err(&adapter->pdev->dev,
                          "Cannot alloc memory for Free Buffer Ring 0\n");
                return -ENOMEM;
        }

        /* Save physical address
         *
         * NOTE: dma_alloc_coherent(), used above to alloc DMA regions,
         * ALWAYS returns SAC (32-bit) addresses. If DAC (64-bit) addresses
         * are ever returned, make sure the high part is retrieved here before
         * storing the adjusted address.
         */
        rx_ring->fbr[1]->real_physaddr = rx_ring->fbr[1]->ring_physaddr;

        /* Align Free Buffer Ring 0 on a 4K boundary */
        et131x_align_allocated_memory(adapter,
                                      &rx_ring->fbr[1]->real_physaddr,
                                      &rx_ring->fbr[1]->offset, 0x0FFF);

        rx_ring->fbr[1]->ring_virtaddr =
                        (void *)((u8 *) rx_ring->fbr[1]->ring_virtaddr +
                        rx_ring->fbr[1]->offset);
#endif
        for (i = 0; i < (rx_ring->fbr[0]->num_entries / FBR_CHUNKS); i++) {
                u64 fbr1_tmp_physaddr;
                u64 fbr1_offset;
                u32 fbr1_align;

                /* This code allocates an area of memory big enough for N
                 * free buffers + (buffer_size - 1) so that the buffers can
                 * be aligned on 4k boundaries.  If each buffer were aligned
                 * to a buffer_size boundary, the effect would be to double
                 * the size of FBR0.  By allocating N buffers at once, we
                 * reduce this overhead.
                 */
                if (rx_ring->fbr[0]->buffsize > 4096)
                        fbr1_align = 4096;
                else
                        fbr1_align = rx_ring->fbr[0]->buffsize;

                fbr_chunksize =
                    (FBR_CHUNKS * rx_ring->fbr[0]->buffsize) + fbr1_align - 1;
                rx_ring->fbr[0]->mem_virtaddrs[i] =
                    dma_alloc_coherent(&adapter->pdev->dev, fbr_chunksize,
                                       &rx_ring->fbr[0]->mem_physaddrs[i],
                                       GFP_KERNEL);

                if (!rx_ring->fbr[0]->mem_virtaddrs[i]) {
                        dev_err(&adapter->pdev->dev,
                                "Could not alloc memory\n");
                        return -ENOMEM;
                }

                /* See NOTE in "Save Physical Address" comment above */
                fbr1_tmp_physaddr = rx_ring->fbr[0]->mem_physaddrs[i];

                et131x_align_allocated_memory(adapter,
                                              &fbr1_tmp_physaddr,
                                              &fbr1_offset, (fbr1_align - 1));

                for (j = 0; j < FBR_CHUNKS; j++) {
                        u32 index = (i * FBR_CHUNKS) + j;

                        /* Save the Virtual address of this index for quick
                         * access later
                         */
                        rx_ring->fbr[0]->virt[index] =
                            (u8 *) rx_ring->fbr[0]->mem_virtaddrs[i] +
                            (j * rx_ring->fbr[0]->buffsize) + fbr1_offset;

                        /* now store the physical address in the descriptor
                         * so the device can access it
                         */
                        rx_ring->fbr[0]->bus_high[index] =
                            (u32) (fbr1_tmp_physaddr >> 32);
                        rx_ring->fbr[0]->bus_low[index] =
                            (u32) fbr1_tmp_physaddr;

                        fbr1_tmp_physaddr += rx_ring->fbr[0]->buffsize;

                        rx_ring->fbr[0]->buffer1[index] =
                            rx_ring->fbr[0]->virt[index];
                        rx_ring->fbr[0]->buffer2[index] =
                            rx_ring->fbr[0]->virt[index] - 4;
                }
        }

#ifdef USE_FBR0
        /* Same for FBR0 (if in use) */
        for (i = 0; i < (rx_ring->fbr[1]->num_entries / FBR_CHUNKS); i++) {
                u64 fbr0_tmp_physaddr;
                u64 fbr0_offset;

                fbr_chunksize =
                    ((FBR_CHUNKS + 1) * rx_ring->fbr[1]->buffsize) - 1;
                rx_ring->fbr[1]->mem_virtaddrs[i] =
                    dma_alloc_coherent(&adapter->pdev->dev, fbr_chunksize,
                                       &rx_ring->fbr[1]->mem_physaddrs[i],
                                       GFP_KERNEL);

                if (!rx_ring->fbr[1]->mem_virtaddrs[i]) {
                        dev_err(&adapter->pdev->dev,
                                "Could not alloc memory\n");
                        return -ENOMEM;
                }

                /* See NOTE in "Save Physical Address" comment above */
                fbr0_tmp_physaddr = rx_ring->fbr[1]->mem_physaddrs[i];

                et131x_align_allocated_memory(adapter,
                                              &fbr0_tmp_physaddr,
                                              &fbr0_offset,
                                              rx_ring->fbr[1]->buffsize - 1);

                for (j = 0; j < FBR_CHUNKS; j++) {
                        u32 index = (i * FBR_CHUNKS) + j;

                        rx_ring->fbr[1]->virt[index] =
                            (u8 *) rx_ring->fbr[1]->mem_virtaddrs[i] +
                            (j * rx_ring->fbr[1]->buffsize) + fbr0_offset;

                        rx_ring->fbr[1]->bus_high[index] =
                            (u32) (fbr0_tmp_physaddr >> 32);
                        rx_ring->fbr[1]->bus_low[index] =
                            (u32) fbr0_tmp_physaddr;

                        fbr0_tmp_physaddr += rx_ring->fbr[1]->buffsize;

                        rx_ring->fbr[1]->buffer1[index] =
                            rx_ring->fbr[1]->virt[index];
                        rx_ring->fbr[1]->buffer2[index] =
                            rx_ring->fbr[1]->virt[index] - 4;
                }
        }
#endif

        /* Allocate an area of memory for FIFO of Packet Status ring entries */
        pktstat_ringsize =
            sizeof(struct pkt_stat_desc) * adapter->rx_ring.psr_num_entries;

        rx_ring->ps_ring_virtaddr = dma_alloc_coherent(&adapter->pdev->dev,
                                                  pktstat_ringsize,
                                                  &rx_ring->ps_ring_physaddr,
                                                  GFP_KERNEL);

        if (!rx_ring->ps_ring_virtaddr) {
                dev_err(&adapter->pdev->dev,
                          "Cannot alloc memory for Packet Status Ring\n");
                return -ENOMEM;
        }
        pr_info("Packet Status Ring %llx\n",
                (unsigned long long) rx_ring->ps_ring_physaddr);

        /*
         * NOTE : dma_alloc_coherent(), used above to alloc DMA regions,
         * ALWAYS returns SAC (32-bit) addresses. If DAC (64-bit) addresses
         * are ever returned, make sure the high part is retrieved here before
         * storing the adjusted address.
         */

        /* Allocate an area of memory for writeback of status information */
        rx_ring->rx_status_block = dma_alloc_coherent(&adapter->pdev->dev,
                                            sizeof(struct rx_status_block),
                                            &rx_ring->rx_status_bus,
                                            GFP_KERNEL);
        if (!rx_ring->rx_status_block) {
                dev_err(&adapter->pdev->dev,
                          "Cannot alloc memory for Status Block\n");
                return -ENOMEM;
        }
        rx_ring->num_rfd = NIC_DEFAULT_NUM_RFD;
        pr_info("PRS %llx\n", (unsigned long long)rx_ring->rx_status_bus);

        /* Recv
         * kmem_cache_create initializes a lookaside list. After successful
         * creation, nonpaged fixed-size blocks can be allocated from and
         * freed to the lookaside list.
         * RFDs will be allocated from this pool.
         */
        rx_ring->recv_lookaside = kmem_cache_create(adapter->netdev->name,
                                                   sizeof(struct rfd),
                                                   0,
                                                   SLAB_CACHE_DMA |
                                                   SLAB_HWCACHE_ALIGN,
                                                   NULL);

        adapter->flags |= fMP_ADAPTER_RECV_LOOKASIDE;

        /* The RFDs are going to be put on lists later on, so initialize the
         * lists now.
         */
        INIT_LIST_HEAD(&rx_ring->recv_list);
        return 0;
}

/**
 * et131x_rx_dma_memory_free - Free all memory allocated within this module.
 * @adapter: pointer to our private adapter structure
 */
static void et131x_rx_dma_memory_free(struct et131x_adapter *adapter)
{
        u32 index;
        u32 bufsize;
        u32 pktstat_ringsize;
        struct rfd *rfd;
        struct rx_ring *rx_ring;

        /* Setup some convenience pointers */
        rx_ring = &adapter->rx_ring;

        /* Free RFDs and associated packet descriptors */
        WARN_ON(rx_ring->num_ready_recv != rx_ring->num_rfd);

        while (!list_empty(&rx_ring->recv_list)) {
                rfd = (struct rfd *) list_entry(rx_ring->recv_list.next,
                                struct rfd, list_node);

                list_del(&rfd->list_node);
                rfd->skb = NULL;
                kmem_cache_free(adapter->rx_ring.recv_lookaside, rfd);
        }

        /* Free Free Buffer Ring 1 */
        if (rx_ring->fbr[0]->ring_virtaddr) {
                /* First the packet memory */
                for (index = 0; index <
                     (rx_ring->fbr[0]->num_entries / FBR_CHUNKS); index++) {
                        if (rx_ring->fbr[0]->mem_virtaddrs[index]) {
                                u32 fbr1_align;

                                if (rx_ring->fbr[0]->buffsize > 4096)
                                        fbr1_align = 4096;
                                else
                                        fbr1_align = rx_ring->fbr[0]->buffsize;

                                bufsize =
                                    (rx_ring->fbr[0]->buffsize * FBR_CHUNKS) +
                                    fbr1_align - 1;

                                dma_free_coherent(&adapter->pdev->dev,
                                        bufsize,
                                        rx_ring->fbr[0]->mem_virtaddrs[index],
                                        rx_ring->fbr[0]->mem_physaddrs[index]);

                                rx_ring->fbr[0]->mem_virtaddrs[index] = NULL;
                        }
                }

                /* Now the FIFO itself */
                rx_ring->fbr[0]->ring_virtaddr = (void *)((u8 *)
                    rx_ring->fbr[0]->ring_virtaddr - rx_ring->fbr[0]->offset);

                bufsize =
                    (sizeof(struct fbr_desc) * rx_ring->fbr[0]->num_entries) +
                                                                        0xfff;

                dma_free_coherent(&adapter->pdev->dev, bufsize,
                                    rx_ring->fbr[0]->ring_virtaddr,
                                    rx_ring->fbr[0]->ring_physaddr);

                rx_ring->fbr[0]->ring_virtaddr = NULL;
        }

#ifdef USE_FBR0
        /* Now the same for Free Buffer Ring 0 */
        if (rx_ring->fbr[1]->ring_virtaddr) {
                /* First the packet memory */
                for (index = 0; index <
                     (rx_ring->fbr[1]->num_entries / FBR_CHUNKS); index++) {
                        if (rx_ring->fbr[1]->mem_virtaddrs[index]) {
                                bufsize =
                                    (rx_ring->fbr[1]->buffsize *
                                     (FBR_CHUNKS + 1)) - 1;

                                dma_free_coherent(&adapter->pdev->dev,
                                        bufsize,
                                        rx_ring->fbr[1]->mem_virtaddrs[index],
                                        rx_ring->fbr[1]->mem_physaddrs[index]);

                                rx_ring->fbr[1]->mem_virtaddrs[index] = NULL;
                        }
                }

                /* Now the FIFO itself */
                rx_ring->fbr[1]->ring_virtaddr = (void *)((u8 *)
                    rx_ring->fbr[1]->ring_virtaddr - rx_ring->fbr[1]->offset);

                bufsize =
                    (sizeof(struct fbr_desc) * rx_ring->fbr[1]->num_entries) +
                                                                        0xfff;

                dma_free_coherent(&adapter->pdev->dev,
                                  bufsize,
                                  rx_ring->fbr[1]->ring_virtaddr,
                                  rx_ring->fbr[1]->ring_physaddr);

                rx_ring->fbr[1]->ring_virtaddr = NULL;
        }
#endif

        /* Free Packet Status Ring */
        if (rx_ring->ps_ring_virtaddr) {
                pktstat_ringsize =
                    sizeof(struct pkt_stat_desc) *
                    adapter->rx_ring.psr_num_entries;

                dma_free_coherent(&adapter->pdev->dev, pktstat_ringsize,
                                    rx_ring->ps_ring_virtaddr,
                                    rx_ring->ps_ring_physaddr);

                rx_ring->ps_ring_virtaddr = NULL;
        }

        /* Free area of memory for the writeback of status information */
        if (rx_ring->rx_status_block) {
                dma_free_coherent(&adapter->pdev->dev,
                        sizeof(struct rx_status_block),
                        rx_ring->rx_status_block, rx_ring->rx_status_bus);
                rx_ring->rx_status_block = NULL;
        }

        /* Destroy the lookaside (RFD) pool */
        if (adapter->flags & fMP_ADAPTER_RECV_LOOKASIDE) {
                kmem_cache_destroy(rx_ring->recv_lookaside);
                adapter->flags &= ~fMP_ADAPTER_RECV_LOOKASIDE;
        }

        /* Free the FBR Lookup Table */
#ifdef USE_FBR0
        kfree(rx_ring->fbr[1]);
#endif

        kfree(rx_ring->fbr[0]);

        /* Reset Counters */
        rx_ring->num_ready_recv = 0;
}

/**
 * et131x_init_recv - Initialize receive data structures.
 * @adapter: pointer to our private adapter structure
 *
 * Returns 0 on success and errno on failure (as defined in errno.h)
 */
static int et131x_init_recv(struct et131x_adapter *adapter)
{
        int status = -ENOMEM;
        struct rfd *rfd = NULL;
        u32 rfdct;
        u32 numrfd = 0;
        struct rx_ring *rx_ring;

        /* Setup some convenience pointers */
        rx_ring = &adapter->rx_ring;

        /* Setup each RFD */
        for (rfdct = 0; rfdct < rx_ring->num_rfd; rfdct++) {
                rfd = kmem_cache_alloc(rx_ring->recv_lookaside,
                                                     GFP_ATOMIC | GFP_DMA);

                if (!rfd) {
                        dev_err(&adapter->pdev->dev,
                                  "Couldn't alloc RFD out of kmem_cache\n");
                        status = -ENOMEM;
                        continue;
                }

                rfd->skb = NULL;

                /* Add this RFD to the recv_list */
                list_add_tail(&rfd->list_node, &rx_ring->recv_list);

                /* Increment both the available RFD's, and the total RFD's. */
                rx_ring->num_ready_recv++;
                numrfd++;
        }

        if (numrfd > NIC_MIN_NUM_RFD)
                status = 0;

        rx_ring->num_rfd = numrfd;

        if (status != 0) {
                kmem_cache_free(rx_ring->recv_lookaside, rfd);
                dev_err(&adapter->pdev->dev,
                          "Allocation problems in et131x_init_recv\n");
        }
        return status;
}

/**
 * et131x_set_rx_dma_timer - Set the heartbeat timer according to line rate.
 * @adapter: pointer to our adapter structure
 */
static void et131x_set_rx_dma_timer(struct et131x_adapter *adapter)
{
        struct phy_device *phydev = adapter->phydev;

        if (!phydev)
                return;

        /* For version B silicon, we do not use the RxDMA timer for 10 and 100
         * Mbits/s line rates. We do not enable and RxDMA interrupt coalescing.
         */
        if ((phydev->speed == SPEED_100) || (phydev->speed == SPEED_10)) {
                writel(0, &adapter->regs->rxdma.max_pkt_time);
                writel(1, &adapter->regs->rxdma.num_pkt_done);
        }
}

/**
 * NICReturnRFD - Recycle a RFD and put it back onto the receive list
 * @adapter: pointer to our adapter
 * @rfd: pointer to the RFD
 */
static void nic_return_rfd(struct et131x_adapter *adapter, struct rfd *rfd)
{
        struct rx_ring *rx_local = &adapter->rx_ring;
        struct rxdma_regs __iomem *rx_dma = &adapter->regs->rxdma;
        u16 buff_index = rfd->bufferindex;
        u8 ring_index = rfd->ringindex;
        unsigned long flags;

        /* We don't use any of the OOB data besides status. Otherwise, we
         * need to clean up OOB data
         */
        if (
#ifdef USE_FBR0
            (ring_index == 0 && buff_index < rx_local->fbr[1]->num_entries) ||
#endif
            (ring_index == 1 && buff_index < rx_local->fbr[0]->num_entries)) {
                spin_lock_irqsave(&adapter->fbr_lock, flags);

                if (ring_index == 1) {
                        struct fbr_desc *next = (struct fbr_desc *)
                                        (rx_local->fbr[0]->ring_virtaddr) +
                                        INDEX10(rx_local->fbr[0]->local_full);

                        /* Handle the Free Buffer Ring advancement here. Write
                         * the PA / Buffer Index for the returned buffer into
                         * the oldest (next to be freed)FBR entry
                         */
                        next->addr_hi = rx_local->fbr[0]->bus_high[buff_index];
                        next->addr_lo = rx_local->fbr[0]->bus_low[buff_index];
                        next->word2 = buff_index;

                        writel(bump_free_buff_ring(
                                        &rx_local->fbr[0]->local_full,
                                        rx_local->fbr[0]->num_entries - 1),
                                        &rx_dma->fbr1_full_offset);
                }
#ifdef USE_FBR0
                else {
                        struct fbr_desc *next = (struct fbr_desc *)
                                rx_local->fbr[1]->ring_virtaddr +
                                    INDEX10(rx_local->fbr[1]->local_full);

                        /* Handle the Free Buffer Ring advancement here. Write
                         * the PA / Buffer Index for the returned buffer into
                         * the oldest (next to be freed) FBR entry
                         */
                        next->addr_hi = rx_local->fbr[1]->bus_high[buff_index];
                        next->addr_lo = rx_local->fbr[1]->bus_low[buff_index];
                        next->word2 = buff_index;

                        writel(bump_free_buff_ring(
                                        &rx_local->fbr[1]->local_full,
                                        rx_local->fbr[1]->num_entries - 1),
                               &rx_dma->fbr0_full_offset);
                }
#endif
                spin_unlock_irqrestore(&adapter->fbr_lock, flags);
        } else {
                dev_err(&adapter->pdev->dev,
                          "%s illegal Buffer Index returned\n", __func__);
        }

        /* The processing on this RFD is done, so put it back on the tail of
         * our list
         */
        spin_lock_irqsave(&adapter->rcv_lock, flags);
        list_add_tail(&rfd->list_node, &rx_local->recv_list);
        rx_local->num_ready_recv++;
        spin_unlock_irqrestore(&adapter->rcv_lock, flags);

        WARN_ON(rx_local->num_ready_recv > rx_local->num_rfd);
}

/**
 * nic_rx_pkts - Checks the hardware for available packets
 * @adapter: pointer to our adapter
 *
 * Returns rfd, a pointer to our MPRFD.
 *
 * Checks the hardware for available packets, using completion ring
 * If packets are available, it gets an RFD from the recv_list, attaches
 * the packet to it, puts the RFD in the RecvPendList, and also returns
 * the pointer to the RFD.
 */
static struct rfd *nic_rx_pkts(struct et131x_adapter *adapter)
{
        struct rx_ring *rx_local = &adapter->rx_ring;
        struct rx_status_block *status;
        struct pkt_stat_desc *psr;
        struct rfd *rfd;
        u32 i;
        u8 *buf;
        unsigned long flags;
        struct list_head *element;
        u8 ring_index;
        u16 buff_index;
        u32 len;
        u32 word0;
        u32 word1;

        /* RX Status block is written by the DMA engine prior to every
         * interrupt. It contains the next to be used entry in the Packet
         * Status Ring, and also the two Free Buffer rings.
         */
        status = rx_local->rx_status_block;
        word1 = status->word1 >> 16;    /* Get the useful bits */

        /* Check the PSR and wrap bits do not match */
        if ((word1 & 0x1FFF) == (rx_local->local_psr_full & 0x1FFF))
                /* Looks like this ring is not updated yet */
                return NULL;

        /* The packet status ring indicates that data is available. */
        psr = (struct pkt_stat_desc *) (rx_local->ps_ring_virtaddr) +
                        (rx_local->local_psr_full & 0xFFF);

        /* Grab any information that is required once the PSR is
         * advanced, since we can no longer rely on the memory being
         * accurate
         */
        len = psr->word1 & 0xFFFF;
        ring_index = (psr->word1 >> 26) & 0x03;
        buff_index = (psr->word1 >> 16) & 0x3FF;
        word0 = psr->word0;

        /* Indicate that we have used this PSR entry. */
        /* FIXME wrap 12 */
        add_12bit(&rx_local->local_psr_full, 1);
        if (
          (rx_local->local_psr_full & 0xFFF) > rx_local->psr_num_entries - 1) {
                /* Clear psr full and toggle the wrap bit */
                rx_local->local_psr_full &=  ~0xFFF;
                rx_local->local_psr_full ^= 0x1000;
        }

        writel(rx_local->local_psr_full,
               &adapter->regs->rxdma.psr_full_offset);

#ifndef USE_FBR0
        if (ring_index != 1)
                return NULL;
#endif

#ifdef USE_FBR0
        if (ring_index > 1 ||
                (ring_index == 0 &&
                buff_index > rx_local->fbr[1]->num_entries - 1) ||
                (ring_index == 1 &&
                buff_index > rx_local->fbr[0]->num_entries - 1)) {
#else
        if (ring_index != 1 || buff_index > rx_local->fbr[0]->num_entries - 1) {
#endif
                /* Illegal buffer or ring index cannot be used by S/W*/
                dev_err(&adapter->pdev->dev,
                          "NICRxPkts PSR Entry %d indicates "
                          "length of %d and/or bad bi(%d)\n",
                          rx_local->local_psr_full & 0xFFF,
                          len, buff_index);
                return NULL;
        }

        /* Get and fill the RFD. */
        spin_lock_irqsave(&adapter->rcv_lock, flags);

        rfd = NULL;
        element = rx_local->recv_list.next;
        rfd = (struct rfd *) list_entry(element, struct rfd, list_node);

        if (rfd == NULL) {
                spin_unlock_irqrestore(&adapter->rcv_lock, flags);
                return NULL;
        }

        list_del(&rfd->list_node);
        rx_local->num_ready_recv--;

        spin_unlock_irqrestore(&adapter->rcv_lock, flags);

        rfd->bufferindex = buff_index;
        rfd->ringindex = ring_index;

        /* In V1 silicon, there is a bug which screws up filtering of
         * runt packets.  Therefore runt packet filtering is disabled
         * in the MAC and the packets are dropped here.  They are
         * also counted here.
         */
        if (len < (NIC_MIN_PACKET_SIZE + 4)) {
                adapter->stats.rx_other_errs++;
                len = 0;
        }

        if (len) {
                /* Determine if this is a multicast packet coming in */
                if ((word0 & ALCATEL_MULTICAST_PKT) &&
                    !(word0 & ALCATEL_BROADCAST_PKT)) {
                        /* Promiscuous mode and Multicast mode are
                         * not mutually exclusive as was first
                         * thought.  I guess Promiscuous is just
                         * considered a super-set of the other
                         * filters. Generally filter is 0x2b when in
                         * promiscuous mode.
                         */
                        if ((adapter->packet_filter &
                                        ET131X_PACKET_TYPE_MULTICAST)
                            && !(adapter->packet_filter &
                                        ET131X_PACKET_TYPE_PROMISCUOUS)
                            && !(adapter->packet_filter &
                                        ET131X_PACKET_TYPE_ALL_MULTICAST)) {
                                /*
                                 * Note - ring_index for fbr[] array is reversed
                                 * 1 for FBR0 etc
                                 */
                                buf = rx_local->fbr[(ring_index == 0 ? 1 : 0)]->
                                                virt[buff_index];

                                /* Loop through our list to see if the
                                 * destination address of this packet
                                 * matches one in our list.
                                 */
                                for (i = 0; i < adapter->multicast_addr_count;
                                     i++) {
                                        if (buf[0] ==
                                                adapter->multicast_list[i][0]
                                            && buf[1] ==
                                                adapter->multicast_list[i][1]
                                            && buf[2] ==
                                                adapter->multicast_list[i][2]
                                            && buf[3] ==
                                                adapter->multicast_list[i][3]
                                            && buf[4] ==
                                                adapter->multicast_list[i][4]
                                            && buf[5] ==
                                                adapter->multicast_list[i][5]) {
                                                break;
                                        }
                                }

                                /* If our index is equal to the number
                                 * of Multicast address we have, then
                                 * this means we did not find this
                                 * packet's matching address in our
                                 * list.  Set the len to zero,
                                 * so we free our RFD when we return
                                 * from this function.
                                 */
                                if (i == adapter->multicast_addr_count)
                                        len = 0;
                        }

                        if (len > 0)
                                adapter->stats.multicast_pkts_rcvd++;
                } else if (word0 & ALCATEL_BROADCAST_PKT)
                        adapter->stats.broadcast_pkts_rcvd++;
                else
                        /* Not sure what this counter measures in
                         * promiscuous mode. Perhaps we should check
                         * the MAC address to see if it is directed
                         * to us in promiscuous mode.
                         */
                        adapter->stats.unicast_pkts_rcvd++;
        }

        if (len > 0) {
                struct sk_buff *skb = NULL;

                /*rfd->len = len - 4; */
                rfd->len = len;

                skb = dev_alloc_skb(rfd->len + 2);
                if (!skb) {
                        dev_err(&adapter->pdev->dev,
                                  "Couldn't alloc an SKB for Rx\n");
                        return NULL;
                }

                adapter->net_stats.rx_bytes += rfd->len;

                /*
                 * Note - ring_index for fbr[] array is reversed,
                 * 1 for FBR0 etc
                 */
                memcpy(skb_put(skb, rfd->len),
                    rx_local->fbr[(ring_index == 0 ? 1 : 0)]->virt[buff_index],
                    rfd->len);

                skb->dev = adapter->netdev;
                skb->protocol = eth_type_trans(skb, adapter->netdev);
                skb->ip_summed = CHECKSUM_NONE;

                netif_rx_ni(skb);
        } else {
                rfd->len = 0;
        }

        nic_return_rfd(adapter, rfd);
        return rfd;
}

/**
 * et131x_handle_recv_interrupt - Interrupt handler for receive processing
 * @adapter: pointer to our adapter
 *
 * Assumption, Rcv spinlock has been acquired.
 */
static void et131x_handle_recv_interrupt(struct et131x_adapter *adapter)
{
        struct rfd *rfd = NULL;
        u32 count = 0;
        bool done = true;

        /* Process up to available RFD's */
        while (count < NUM_PACKETS_HANDLED) {
                if (list_empty(&adapter->rx_ring.recv_list)) {
                        WARN_ON(adapter->rx_ring.num_ready_recv != 0);
                        done = false;
                        break;
                }

                rfd = nic_rx_pkts(adapter);

                if (rfd == NULL)
                        break;

                /* Do not receive any packets until a filter has been set.
                 * Do not receive any packets until we have link.
                 * If length is zero, return the RFD in order to advance the
                 * Free buffer ring.
                 */
                if (!adapter->packet_filter ||
                    !netif_carrier_ok(adapter->netdev) ||
                    rfd->len == 0)
                        continue;

                /* Increment the number of packets we received */
                adapter->net_stats.rx_packets++;

                /* Set the status on the packet, either resources or success */
                if (adapter->rx_ring.num_ready_recv < RFD_LOW_WATER_MARK) {
                        dev_warn(&adapter->pdev->dev,
                                    "RFD's are running out\n");
                }
                count++;
        }

        if (count == NUM_PACKETS_HANDLED || !done) {
                adapter->rx_ring.unfinished_receives = true;
                writel(PARM_TX_TIME_INT_DEF * NANO_IN_A_MICRO,
                       &adapter->regs->global.watchdog_timer);
        } else
                /* Watchdog timer will disable itself if appropriate. */
                adapter->rx_ring.unfinished_receives = false;
}

/**
 * et131x_tx_dma_memory_alloc
 * @adapter: pointer to our private adapter structure
 *
 * Returns 0 on success and errno on failure (as defined in errno.h).
 *
 * Allocates memory that will be visible both to the device and to the CPU.
 * The OS will pass us packets, pointers to which we will insert in the Tx
 * Descriptor queue. The device will read this queue to find the packets in
 * memory. The device will update the "status" in memory each time it xmits a
 * packet.
 */
static int et131x_tx_dma_memory_alloc(struct et131x_adapter *adapter)
{
        int desc_size = 0;
        struct tx_ring *tx_ring = &adapter->tx_ring;

        /* Allocate memory for the TCB's (Transmit Control Block) */
        adapter->tx_ring.tcb_ring =
                kcalloc(NUM_TCB, sizeof(struct tcb), GFP_ATOMIC | GFP_DMA);
        if (!adapter->tx_ring.tcb_ring) {
                dev_err(&adapter->pdev->dev, "Cannot alloc memory for TCBs\n");
                return -ENOMEM;
        }

        /* Allocate enough memory for the Tx descriptor ring, and allocate
         * some extra so that the ring can be aligned on a 4k boundary.
         */
        desc_size = (sizeof(struct tx_desc) * NUM_DESC_PER_RING_TX) + 4096 - 1;
        tx_ring->tx_desc_ring =
            (struct tx_desc *) dma_alloc_coherent(&adapter->pdev->dev,
                                                  desc_size,
                                                  &tx_ring->tx_desc_ring_pa,
                                                  GFP_KERNEL);
        if (!adapter->tx_ring.tx_desc_ring) {
                dev_err(&adapter->pdev->dev,
                        "Cannot alloc memory for Tx Ring\n");
                return -ENOMEM;
        }

        /* Save physical address
         *
         * NOTE: dma_alloc_coherent(), used above to alloc DMA regions,
         * ALWAYS returns SAC (32-bit) addresses. If DAC (64-bit) addresses
         * are ever returned, make sure the high part is retrieved here before
         * storing the adjusted address.
         */
        /* Allocate memory for the Tx status block */
        tx_ring->tx_status = dma_alloc_coherent(&adapter->pdev->dev,
                                                    sizeof(u32),
                                                    &tx_ring->tx_status_pa,
                                                    GFP_KERNEL);
        if (!adapter->tx_ring.tx_status_pa) {
                dev_err(&adapter->pdev->dev,
                                  "Cannot alloc memory for Tx status block\n");
                return -ENOMEM;
        }
        return 0;
}

/**
 * et131x_tx_dma_memory_free - Free all memory allocated within this module
 * @adapter: pointer to our private adapter structure
 *
 * Returns 0 on success and errno on failure (as defined in errno.h).
 */
static void et131x_tx_dma_memory_free(struct et131x_adapter *adapter)
{
        int desc_size = 0;

        if (adapter->tx_ring.tx_desc_ring) {
                /* Free memory relating to Tx rings here */
                desc_size = (sizeof(struct tx_desc) * NUM_DESC_PER_RING_TX)
                                                                + 4096 - 1;
                dma_free_coherent(&adapter->pdev->dev,
                                    desc_size,
                                    adapter->tx_ring.tx_desc_ring,
                                    adapter->tx_ring.tx_desc_ring_pa);
                adapter->tx_ring.tx_desc_ring = NULL;
        }

        /* Free memory for the Tx status block */
        if (adapter->tx_ring.tx_status) {
                dma_free_coherent(&adapter->pdev->dev,
                                    sizeof(u32),
                                    adapter->tx_ring.tx_status,
                                    adapter->tx_ring.tx_status_pa);

                adapter->tx_ring.tx_status = NULL;
        }
        /* Free the memory for the tcb structures */
        kfree(adapter->tx_ring.tcb_ring);
}

/**
 * nic_send_packet - NIC specific send handler for version B silicon.
 * @adapter: pointer to our adapter
 * @tcb: pointer to struct tcb
 *
 * Returns 0 or errno.
 */
static int nic_send_packet(struct et131x_adapter *adapter, struct tcb *tcb)
{
        u32 i;
        struct tx_desc desc[24];        /* 24 x 16 byte */
        u32 frag = 0;
        u32 thiscopy, remainder;
        struct sk_buff *skb = tcb->skb;
        u32 nr_frags = skb_shinfo(skb)->nr_frags + 1;
        struct skb_frag_struct *frags = &skb_shinfo(skb)->frags[0];
        unsigned long flags;
        struct phy_device *phydev = adapter->phydev;

        /* Part of the optimizations of this send routine restrict us to
         * sending 24 fragments at a pass.  In practice we should never see
         * more than 5 fragments.
         *
         * NOTE: The older version of this function (below) can handle any
         * number of fragments. If needed, we can call this function,
         * although it is less efficient.
         */
        if (nr_frags > 23)
                return -EIO;

        memset(desc, 0, sizeof(struct tx_desc) * (nr_frags + 1));

        for (i = 0; i < nr_frags; i++) {
                /* If there is something in this element, lets get a
                 * descriptor from the ring and get the necessary data
                 */
                if (i == 0) {
                        /* If the fragments are smaller than a standard MTU,
                         * then map them to a single descriptor in the Tx
                         * Desc ring. However, if they're larger, as is
                         * possible with support for jumbo packets, then
                         * split them each across 2 descriptors.
                         *
                         * This will work until we determine why the hardware
                         * doesn't seem to like large fragments.
                         */
                        if ((skb->len - skb->data_len) <= 1514) {
                                desc[frag].addr_hi = 0;
                                /* Low 16bits are length, high is vlan and
                                   unused currently so zero */
                                desc[frag].len_vlan =
                                        skb->len - skb->data_len;

                                /* NOTE: Here, the dma_addr_t returned from
                                 * dma_map_single() is implicitly cast as a
                                 * u32. Although dma_addr_t can be
                                 * 64-bit, the address returned by
                                 * dma_map_single() is always 32-bit
                                 * addressable (as defined by the pci/dma
                                 * subsystem)
                                 */
                                desc[frag++].addr_lo =
                                    dma_map_single(&adapter->pdev->dev,
                                                   skb->data,
                                                   skb->len -
                                                   skb->data_len,
                                                   DMA_TO_DEVICE);
                        } else {
                                desc[frag].addr_hi = 0;
                                desc[frag].len_vlan =
                                    (skb->len - skb->data_len) / 2;

                                /* NOTE: Here, the dma_addr_t returned from
                                 * dma_map_single() is implicitly cast as a
                                 * u32. Although dma_addr_t can be
                                 * 64-bit, the address returned by
                                 * dma_map_single() is always 32-bit
                                 * addressable (as defined by the pci/dma
                                 * subsystem)
                                 */
                                desc[frag++].addr_lo =
                                    dma_map_single(&adapter->pdev->dev,
                                                   skb->data,
                                                   ((skb->len -
                                                     skb->data_len) / 2),
                                                   DMA_TO_DEVICE);
                                desc[frag].addr_hi = 0;

                                desc[frag].len_vlan =
                                    (skb->len - skb->data_len) / 2;

                                /* NOTE: Here, the dma_addr_t returned from
                                 * dma_map_single() is implicitly cast as a
                                 * u32. Although dma_addr_t can be
                                 * 64-bit, the address returned by
                                 * dma_map_single() is always 32-bit
                                 * addressable (as defined by the pci/dma
                                 * subsystem)
                                 */
                                desc[frag++].addr_lo =
                                    dma_map_single(&adapter->pdev->dev,
                                                   skb->data +
                                                   ((skb->len -
                                                     skb->data_len) / 2),
                                                   ((skb->len -
                                                     skb->data_len) / 2),
                                                   DMA_TO_DEVICE);
                        }
                } else {
                        desc[frag].addr_hi = 0;
                        desc[frag].len_vlan =
                                        frags[i - 1].size;

                        /* NOTE: Here, the dma_addr_t returned from
                         * dma_map_page() is implicitly cast as a u32.
                         * Although dma_addr_t can be 64-bit, the address
                         * returned by dma_map_page() is always 32-bit
                         * addressable (as defined by the pci/dma subsystem)
                         */
                        desc[frag++].addr_lo = skb_frag_dma_map(
                                                        &adapter->pdev->dev,
                                                        &frags[i - 1],
                                                        0,
                                                        frags[i - 1].size,
                                                        DMA_TO_DEVICE);
                }
        }

        if (phydev && phydev->speed == SPEED_1000) {
                if (++adapter->tx_ring.since_irq == PARM_TX_NUM_BUFS_DEF) {
                        /* Last element & Interrupt flag */
                        desc[frag - 1].flags = 0x5;
                        adapter->tx_ring.since_irq = 0;
                } else { /* Last element */
                        desc[frag - 1].flags = 0x1;
                }
        } else
                desc[frag - 1].flags = 0x5;

        desc[0].flags |= 2;     /* First element flag */

        tcb->index_start = adapter->tx_ring.send_idx;
        tcb->stale = 0;

        spin_lock_irqsave(&adapter->send_hw_lock, flags);

        thiscopy = NUM_DESC_PER_RING_TX -
                                INDEX10(adapter->tx_ring.send_idx);

        if (thiscopy >= frag) {
                remainder = 0;
                thiscopy = frag;
        } else {
                remainder = frag - thiscopy;
        }

        memcpy(adapter->tx_ring.tx_desc_ring +
               INDEX10(adapter->tx_ring.send_idx), desc,
               sizeof(struct tx_desc) * thiscopy);

        add_10bit(&adapter->tx_ring.send_idx, thiscopy);

        if (INDEX10(adapter->tx_ring.send_idx) == 0 ||
                  INDEX10(adapter->tx_ring.send_idx) == NUM_DESC_PER_RING_TX) {
                adapter->tx_ring.send_idx &= ~ET_DMA10_MASK;
                adapter->tx_ring.send_idx ^= ET_DMA10_WRAP;
        }

        if (remainder) {
                memcpy(adapter->tx_ring.tx_desc_ring,
                       desc + thiscopy,
                       sizeof(struct tx_desc) * remainder);

                add_10bit(&adapter->tx_ring.send_idx, remainder);
        }

        if (INDEX10(adapter->tx_ring.send_idx) == 0) {
                if (adapter->tx_ring.send_idx)
                        tcb->index = NUM_DESC_PER_RING_TX - 1;
                else
                        tcb->index = ET_DMA10_WRAP|(NUM_DESC_PER_RING_TX - 1);
        } else
                tcb->index = adapter->tx_ring.send_idx - 1;

        spin_lock(&adapter->tcb_send_qlock);

        if (adapter->tx_ring.send_tail)
                adapter->tx_ring.send_tail->next = tcb;
        else
                adapter->tx_ring.send_head = tcb;

        adapter->tx_ring.send_tail = tcb;

        WARN_ON(tcb->next != NULL);

        adapter->tx_ring.used++;

        spin_unlock(&adapter->tcb_send_qlock);

        /* Write the new write pointer back to the device. */
        writel(adapter->tx_ring.send_idx,
               &adapter->regs->txdma.service_request);

        /* For Gig only, we use Tx Interrupt coalescing.  Enable the software
         * timer to wake us up if this packet isn't followed by N more.
         */
        if (phydev && phydev->speed == SPEED_1000) {
                writel(PARM_TX_TIME_INT_DEF * NANO_IN_A_MICRO,
                       &adapter->regs->global.watchdog_timer);
        }
        spin_unlock_irqrestore(&adapter->send_hw_lock, flags);

        return 0;
}

/**
 * send_packet - Do the work to send a packet
 * @skb: the packet(s) to send
 * @adapter: a pointer to the device's private adapter structure
 *
 * Return 0 in almost all cases; non-zero value in extreme hard failure only.
 *
 * Assumption: Send spinlock has been acquired
 */
static int send_packet(struct sk_buff *skb, struct et131x_adapter *adapter)
{
        int status;
        struct tcb *tcb = NULL;
        u16 *shbufva;
        unsigned long flags;

        /* All packets must have at least a MAC address and a protocol type */
        if (skb->len < ETH_HLEN)
                return -EIO;

        /* Get a TCB for this packet */
        spin_lock_irqsave(&adapter->tcb_ready_qlock, flags);

        tcb = adapter->tx_ring.tcb_qhead;

        if (tcb == NULL) {
                spin_unlock_irqrestore(&adapter->tcb_ready_qlock, flags);
                return -ENOMEM;
        }

        adapter->tx_ring.tcb_qhead = tcb->next;

        if (adapter->tx_ring.tcb_qhead == NULL)
                adapter->tx_ring.tcb_qtail = NULL;

        spin_unlock_irqrestore(&adapter->tcb_ready_qlock, flags);

        tcb->skb = skb;

        if (skb->data != NULL && skb->len - skb->data_len >= 6) {
                shbufva = (u16 *) skb->data;

                if ((shbufva[0] == 0xffff) &&
                    (shbufva[1] == 0xffff) && (shbufva[2] == 0xffff)) {
                        tcb->flags |= fMP_DEST_BROAD;
                } else if ((shbufva[0] & 0x3) == 0x0001) {
                        tcb->flags |=  fMP_DEST_MULTI;
                }
        }

        tcb->next = NULL;

        /* Call the NIC specific send handler. */
        status = nic_send_packet(adapter, tcb);

        if (status != 0) {
                spin_lock_irqsave(&adapter->tcb_ready_qlock, flags);

                if (adapter->tx_ring.tcb_qtail)
                        adapter->tx_ring.tcb_qtail->next = tcb;
                else
                        /* Apparently ready Q is empty. */
                        adapter->tx_ring.tcb_qhead = tcb;

                adapter->tx_ring.tcb_qtail = tcb;
                spin_unlock_irqrestore(&adapter->tcb_ready_qlock, flags);
                return status;
        }
        WARN_ON(adapter->tx_ring.used > NUM_TCB);
        return 0;
}

/**
 * et131x_send_packets - This function is called by the OS to send packets
 * @skb: the packet(s) to send
 * @netdev:device on which to TX the above packet(s)
 *
 * Return 0 in almost all cases; non-zero value in extreme hard failure only
 */
static int et131x_send_packets(struct sk_buff *skb, struct net_device *netdev)
{
        int status = 0;
        struct et131x_adapter *adapter = netdev_priv(netdev);

        /* Send these packets
         *
         * NOTE: The Linux Tx entry point is only given one packet at a time
         * to Tx, so the PacketCount and it's array used makes no sense here
         */

        /* TCB is not available */
        if (adapter->tx_ring.used >= NUM_TCB) {
                /* NOTE: If there's an error on send, no need to queue the
                 * packet under Linux; if we just send an error up to the
                 * netif layer, it will resend the skb to us.
                 */
                status = -ENOMEM;
        } else {
                /* We need to see if the link is up; if it's not, make the
                 * netif layer think we're good and drop the packet
                 */
                if ((adapter->flags & fMP_ADAPTER_FAIL_SEND_MASK) ||
                                        !netif_carrier_ok(netdev)) {
                        dev_kfree_skb_any(skb);
                        skb = NULL;

                        adapter->net_stats.tx_dropped++;
                } else {
                        status = send_packet(skb, adapter);
                        if (status != 0 && status != -ENOMEM) {
                                /* On any other error, make netif think we're
                                 * OK and drop the packet
                                 */
                                dev_kfree_skb_any(skb);
                                skb = NULL;
                                adapter->net_stats.tx_dropped++;
                        }
                }
        }
        return status;
}

/**
 * free_send_packet - Recycle a struct tcb
 * @adapter: pointer to our adapter
 * @tcb: pointer to struct tcb
 *
 * Complete the packet if necessary
 * Assumption - Send spinlock has been acquired
 */
static inline void free_send_packet(struct et131x_adapter *adapter,
                                                struct tcb *tcb)
{
        unsigned long flags;
        struct tx_desc *desc = NULL;
        struct net_device_stats *stats = &adapter->net_stats;

        if (tcb->flags & fMP_DEST_BROAD)
                atomic_inc(&adapter->stats.broadcast_pkts_xmtd);
        else if (tcb->flags & fMP_DEST_MULTI)
                atomic_inc(&adapter->stats.multicast_pkts_xmtd);
        else
                atomic_inc(&adapter->stats.unicast_pkts_xmtd);

        if (tcb->skb) {
                stats->tx_bytes += tcb->skb->len;

                /* Iterate through the TX descriptors on the ring
                 * corresponding to this packet and umap the fragments
                 * they point to
                 */
                do {
                        desc = (struct tx_desc *)
                                    (adapter->tx_ring.tx_desc_ring +
                                                INDEX10(tcb->index_start));

                        dma_unmap_single(&adapter->pdev->dev,
                                         desc->addr_lo,
                                         desc->len_vlan, DMA_TO_DEVICE);

                        add_10bit(&tcb->index_start, 1);
                        if (INDEX10(tcb->index_start) >=
                                                        NUM_DESC_PER_RING_TX) {
                                tcb->index_start &= ~ET_DMA10_MASK;
                                tcb->index_start ^= ET_DMA10_WRAP;
                        }
                } while (desc != (adapter->tx_ring.tx_desc_ring +
                                INDEX10(tcb->index)));

                dev_kfree_skb_any(tcb->skb);
        }

        memset(tcb, 0, sizeof(struct tcb));

        /* Add the TCB to the Ready Q */
        spin_lock_irqsave(&adapter->tcb_ready_qlock, flags);

        adapter->net_stats.tx_packets++;

        if (adapter->tx_ring.tcb_qtail)
                adapter->tx_ring.tcb_qtail->next = tcb;
        else
                /* Apparently ready Q is empty. */
                adapter->tx_ring.tcb_qhead = tcb;

        adapter->tx_ring.tcb_qtail = tcb;

        spin_unlock_irqrestore(&adapter->tcb_ready_qlock, flags);
        WARN_ON(adapter->tx_ring.used < 0);
}

/**
 * et131x_free_busy_send_packets - Free and complete the stopped active sends
 * @adapter: pointer to our adapter
 *
 * Assumption - Send spinlock has been acquired
 */
static void et131x_free_busy_send_packets(struct et131x_adapter *adapter)
{
        struct tcb *tcb;
        unsigned long flags;
        u32 freed = 0;

        /* Any packets being sent? Check the first TCB on the send list */
        spin_lock_irqsave(&adapter->tcb_send_qlock, flags);

        tcb = adapter->tx_ring.send_head;

        while (tcb != NULL && freed < NUM_TCB) {
                struct tcb *next = tcb->next;

                adapter->tx_ring.send_head = next;

                if (next == NULL)
                        adapter->tx_ring.send_tail = NULL;

                adapter->tx_ring.used--;

                spin_unlock_irqrestore(&adapter->tcb_send_qlock, flags);

                freed++;
                free_send_packet(adapter, tcb);

                spin_lock_irqsave(&adapter->tcb_send_qlock, flags);

                tcb = adapter->tx_ring.send_head;
        }

        WARN_ON(freed == NUM_TCB);

        spin_unlock_irqrestore(&adapter->tcb_send_qlock, flags);

        adapter->tx_ring.used = 0;
}

/**
 * et131x_handle_send_interrupt - Interrupt handler for sending processing
 * @adapter: pointer to our adapter
 *
 * Re-claim the send resources, complete sends and get more to send from
 * the send wait queue.
 *
 * Assumption - Send spinlock has been acquired
 */
static void et131x_handle_send_interrupt(struct et131x_adapter *adapter)
{
        unsigned long flags;
        u32 serviced;
        struct tcb *tcb;
        u32 index;

        serviced = readl(&adapter->regs->txdma.new_service_complete);
        index = INDEX10(serviced);

        /* Has the ring wrapped?  Process any descriptors that do not have
         * the same "wrap" indicator as the current completion indicator
         */
        spin_lock_irqsave(&adapter->tcb_send_qlock, flags);

        tcb = adapter->tx_ring.send_head;

        while (tcb &&
               ((serviced ^ tcb->index) & ET_DMA10_WRAP) &&
               index < INDEX10(tcb->index)) {
                adapter->tx_ring.used--;
                adapter->tx_ring.send_head = tcb->next;
                if (tcb->next == NULL)
                        adapter->tx_ring.send_tail = NULL;

                spin_unlock_irqrestore(&adapter->tcb_send_qlock, flags);
                free_send_packet(adapter, tcb);
                spin_lock_irqsave(&adapter->tcb_send_qlock, flags);

                /* Goto the next packet */
                tcb = adapter->tx_ring.send_head;
        }
        while (tcb &&
               !((serviced ^ tcb->index) & ET_DMA10_WRAP)
               && index > (tcb->index & ET_DMA10_MASK)) {
                adapter->tx_ring.used--;
                adapter->tx_ring.send_head = tcb->next;
                if (tcb->next == NULL)
                        adapter->tx_ring.send_tail = NULL;

                spin_unlock_irqrestore(&adapter->tcb_send_qlock, flags);
                free_send_packet(adapter, tcb);
                spin_lock_irqsave(&adapter->tcb_send_qlock, flags);

                /* Goto the next packet */
                tcb = adapter->tx_ring.send_head;
        }

        /* Wake up the queue when we hit a low-water mark */
        if (adapter->tx_ring.used <= NUM_TCB / 3)
                netif_wake_queue(adapter->netdev);

        spin_unlock_irqrestore(&adapter->tcb_send_qlock, flags);
}

static int et131x_get_settings(struct net_device *netdev,
                               struct ethtool_cmd *cmd)
{
        struct et131x_adapter *adapter = netdev_priv(netdev);

        return phy_ethtool_gset(adapter->phydev, cmd);
}

static int et131x_set_settings(struct net_device *netdev,
                               struct ethtool_cmd *cmd)
{
        struct et131x_adapter *adapter = netdev_priv(netdev);

        return phy_ethtool_sset(adapter->phydev, cmd);
}

static int et131x_get_regs_len(struct net_device *netdev)
{
#define ET131X_REGS_LEN 256
        return ET131X_REGS_LEN * sizeof(u32);
}

static void et131x_get_regs(struct net_device *netdev,
                            struct ethtool_regs *regs, void *regs_data)
{
        struct et131x_adapter *adapter = netdev_priv(netdev);
        struct address_map __iomem *aregs = adapter->regs;
        u32 *regs_buff = regs_data;
        u32 num = 0;

        memset(regs_data, 0, et131x_get_regs_len(netdev));

        regs->version = (1 << 24) | (adapter->pdev->revision << 16) |
                        adapter->pdev->device;

        /* PHY regs */
        et131x_mii_read(adapter, MII_BMCR, (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, MII_BMSR, (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, MII_PHYSID1, (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, MII_PHYSID2, (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, MII_ADVERTISE, (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, MII_LPA, (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, MII_EXPANSION, (u16 *)&regs_buff[num++]);
        /* Autoneg next page transmit reg */
        et131x_mii_read(adapter, 0x07, (u16 *)&regs_buff[num++]);
        /* Link partner next page reg */
        et131x_mii_read(adapter, 0x08, (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, MII_CTRL1000, (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, MII_STAT1000, (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, MII_ESTATUS, (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, PHY_INDEX_REG, (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, PHY_DATA_REG, (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, PHY_MPHY_CONTROL_REG,
                        (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, PHY_LOOPBACK_CONTROL,
                        (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, PHY_LOOPBACK_CONTROL+1,
                        (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, PHY_REGISTER_MGMT_CONTROL,
                        (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, PHY_CONFIG, (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, PHY_PHY_CONTROL, (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, PHY_INTERRUPT_MASK, (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, PHY_INTERRUPT_STATUS,
                        (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, PHY_PHY_STATUS, (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, PHY_LED_1, (u16 *)&regs_buff[num++]);
        et131x_mii_read(adapter, PHY_LED_2, (u16 *)&regs_buff[num++]);

        /* Global regs */
        regs_buff[num++] = readl(&aregs->global.txq_start_addr);
        regs_buff[num++] = readl(&aregs->global.txq_end_addr);
        regs_buff[num++] = readl(&aregs->global.rxq_start_addr);
        regs_buff[num++] = readl(&aregs->global.rxq_end_addr);
        regs_buff[num++] = readl(&aregs->global.pm_csr);
        regs_buff[num++] = adapter->stats.interrupt_status;
        regs_buff[num++] = readl(&aregs->global.int_mask);
        regs_buff[num++] = readl(&aregs->global.int_alias_clr_en);
        regs_buff[num++] = readl(&aregs->global.int_status_alias);
        regs_buff[num++] = readl(&aregs->global.sw_reset);
        regs_buff[num++] = readl(&aregs->global.slv_timer);
        regs_buff[num++] = readl(&aregs->global.msi_config);
        regs_buff[num++] = readl(&aregs->global.loopback);
        regs_buff[num++] = readl(&aregs->global.watchdog_timer);

        /* TXDMA regs */
        regs_buff[num++] = readl(&aregs->txdma.csr);
        regs_buff[num++] = readl(&aregs->txdma.pr_base_hi);
        regs_buff[num++] = readl(&aregs->txdma.pr_base_lo);
        regs_buff[num++] = readl(&aregs->txdma.pr_num_des);
        regs_buff[num++] = readl(&aregs->txdma.txq_wr_addr);
        regs_buff[num++] = readl(&aregs->txdma.txq_wr_addr_ext);
        regs_buff[num++] = readl(&aregs->txdma.txq_rd_addr);
        regs_buff[num++] = readl(&aregs->txdma.dma_wb_base_hi);
        regs_buff[num++] = readl(&aregs->txdma.dma_wb_base_lo);
        regs_buff[num++] = readl(&aregs->txdma.service_request);
        regs_buff[num++] = readl(&aregs->txdma.service_complete);
        regs_buff[num++] = readl(&aregs->txdma.cache_rd_index);
        regs_buff[num++] = readl(&aregs->txdma.cache_wr_index);
        regs_buff[num++] = readl(&aregs->txdma.tx_dma_error);
        regs_buff[num++] = readl(&aregs->txdma.desc_abort_cnt);
        regs_buff[num++] = readl(&aregs->txdma.payload_abort_cnt);
        regs_buff[num++] = readl(&aregs->txdma.writeback_abort_cnt);
        regs_buff[num++] = readl(&aregs->txdma.desc_timeout_cnt);
        regs_buff[num++] = readl(&aregs->txdma.payload_timeout_cnt);
        regs_buff[num++] = readl(&aregs->txdma.writeback_timeout_cnt);
        regs_buff[num++] = readl(&aregs->txdma.desc_error_cnt);
        regs_buff[num++] = readl(&aregs->txdma.payload_error_cnt);
        regs_buff[num++] = readl(&aregs->txdma.writeback_error_cnt);
        regs_buff[num++] = readl(&aregs->txdma.dropped_tlp_cnt);
        regs_buff[num++] = readl(&aregs->txdma.new_service_complete);
        regs_buff[num++] = readl(&aregs->txdma.ethernet_packet_cnt);

        /* RXDMA regs */
        regs_buff[num++] = readl(&aregs->rxdma.csr);
        regs_buff[num++] = readl(&aregs->rxdma.dma_wb_base_hi);
        regs_buff[num++] = readl(&aregs->rxdma.dma_wb_base_lo);
        regs_buff[num++] = readl(&aregs->rxdma.num_pkt_done);
        regs_buff[num++] = readl(&aregs->rxdma.max_pkt_time);
        regs_buff[num++] = readl(&aregs->rxdma.rxq_rd_addr);
        regs_buff[num++] = readl(&aregs->rxdma.rxq_rd_addr_ext);
        regs_buff[num++] = readl(&aregs->rxdma.rxq_wr_addr);
        regs_buff[num++] = readl(&aregs->rxdma.psr_base_hi);
        regs_buff[num++] = readl(&aregs->rxdma.psr_base_lo);
        regs_buff[num++] = readl(&aregs->rxdma.psr_num_des);
        regs_buff[num++] = readl(&aregs->rxdma.psr_avail_offset);
        regs_buff[num++] = readl(&aregs->rxdma.psr_full_offset);
        regs_buff[num++] = readl(&aregs->rxdma.psr_access_index);
        regs_buff[num++] = readl(&aregs->rxdma.psr_min_des);
        regs_buff[num++] = readl(&aregs->rxdma.fbr0_base_lo);
        regs_buff[num++] = readl(&aregs->rxdma.fbr0_base_hi);
        regs_buff[num++] = readl(&aregs->rxdma.fbr0_num_des);
        regs_buff[num++] = readl(&aregs->rxdma.fbr0_avail_offset);
        regs_buff[num++] = readl(&aregs->rxdma.fbr0_full_offset);
        regs_buff[num++] = readl(&aregs->rxdma.fbr0_rd_index);
        regs_buff[num++] = readl(&aregs->rxdma.fbr0_min_des);
        regs_buff[num++] = readl(&aregs->rxdma.fbr1_base_lo);
        regs_buff[num++] = readl(&aregs->rxdma.fbr1_base_hi);
        regs_buff[num++] = readl(&aregs->rxdma.fbr1_num_des);
        regs_buff[num++] = readl(&aregs->rxdma.fbr1_avail_offset);
        regs_buff[num++] = readl(&aregs->rxdma.fbr1_full_offset);
        regs_buff[num++] = readl(&aregs->rxdma.fbr1_rd_index);
        regs_buff[num++] = readl(&aregs->rxdma.fbr1_min_des);
}

#define ET131X_DRVINFO_LEN 32 /* value from ethtool.h */
static void et131x_get_drvinfo(struct net_device *netdev,
                               struct ethtool_drvinfo *info)
{
        struct et131x_adapter *adapter = netdev_priv(netdev);

        strncpy(info->driver, DRIVER_NAME, ET131X_DRVINFO_LEN);
        strncpy(info->version, DRIVER_VERSION, ET131X_DRVINFO_LEN);
        strncpy(info->bus_info, pci_name(adapter->pdev), ET131X_DRVINFO_LEN);
}

static struct ethtool_ops et131x_ethtool_ops = {
        .get_settings   = et131x_get_settings,
        .set_settings   = et131x_set_settings,
        .get_drvinfo    = et131x_get_drvinfo,
        .get_regs_len   = et131x_get_regs_len,
        .get_regs       = et131x_get_regs,
        .get_link = ethtool_op_get_link,
};
/**
 * et131x_hwaddr_init - set up the MAC Address on the ET1310
 * @adapter: pointer to our private adapter structure
 */
static void et131x_hwaddr_init(struct et131x_adapter *adapter)
{
        /* If have our default mac from init and no mac address from
         * EEPROM then we need to generate the last octet and set it on the
         * device
         */
        if (adapter->rom_addr[0] == 0x00 &&
            adapter->rom_addr[1] == 0x00 &&
            adapter->rom_addr[2] == 0x00 &&
            adapter->rom_addr[3] == 0x00 &&
            adapter->rom_addr[4] == 0x00 &&
            adapter->rom_addr[5] == 0x00) {
                /*
                 * We need to randomly generate the last octet so we
                 * decrease our chances of setting the mac address to
                 * same as another one of our cards in the system
                 */
                get_random_bytes(&adapter->addr[5], 1);
                /*
                 * We have the default value in the register we are
                 * working with so we need to copy the current
                 * address into the permanent address
                 */
                memcpy(adapter->rom_addr,
                        adapter->addr, ETH_ALEN);
        } else {
                /* We do not have an override address, so set the
                 * current address to the permanent address and add
                 * it to the device
                 */
                memcpy(adapter->addr,
                       adapter->rom_addr, ETH_ALEN);
        }
}

/**
 * et131x_pci_init       - initial PCI setup
 * @adapter: pointer to our private adapter structure
 * @pdev: our PCI device
 *
 * Perform the initial setup of PCI registers and if possible initialise
 * the MAC address. At this point the I/O registers have yet to be mapped
 */
static int et131x_pci_init(struct et131x_adapter *adapter,
                                                struct pci_dev *pdev)
{
        int cap = pci_pcie_cap(pdev);
        u16 max_payload;
        u16 ctl;