tg3: Reset phy during bringup when using phylib

[safe/jmp/linux-2.6] / drivers / net / sky2.c

/*
 * New driver for Marvell Yukon 2 chipset.
 * Based on earlier sk98lin, and skge driver.
 *
 * This driver intentionally does not support all the features
 * of the original driver such as link fail-over and link management because
 * those should be done at higher levels.
 *
 * Copyright (C) 2005 Stephen Hemminger <shemminger@osdl.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/crc32.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/dma-mapping.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/pci.h>
#include <linux/ip.h>
#include <net/ip.h>
#include <linux/tcp.h>
#include <linux/in.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/if_vlan.h>
#include <linux/prefetch.h>
#include <linux/debugfs.h>
#include <linux/mii.h>

#include <asm/irq.h>

#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
#define SKY2_VLAN_TAG_USED 1
#endif

#include "sky2.h"

#define DRV_NAME                "sky2"
#define DRV_VERSION             "1.27"
#define PFX                     DRV_NAME " "

/*
 * The Yukon II chipset takes 64 bit command blocks (called list elements)
 * that are organized into three (receive, transmit, status) different rings
 * similar to Tigon3.
 */

#define RX_LE_SIZE              1024
#define RX_LE_BYTES             (RX_LE_SIZE*sizeof(struct sky2_rx_le))
#define RX_MAX_PENDING          (RX_LE_SIZE/6 - 2)
#define RX_DEF_PENDING          RX_MAX_PENDING

/* This is the worst case number of transmit list elements for a single skb:
   VLAN:GSO + CKSUM + Data + skb_frags * DMA */
#define MAX_SKB_TX_LE   (2 + (sizeof(dma_addr_t)/sizeof(u32))*(MAX_SKB_FRAGS+1))
#define TX_MIN_PENDING          (MAX_SKB_TX_LE+1)
#define TX_MAX_PENDING          4096
#define TX_DEF_PENDING          127

#define STATUS_RING_SIZE        2048    /* 2 ports * (TX + 2*RX) */
#define STATUS_LE_BYTES         (STATUS_RING_SIZE*sizeof(struct sky2_status_le))
#define TX_WATCHDOG             (5 * HZ)
#define NAPI_WEIGHT             64
#define PHY_RETRIES             1000

#define SKY2_EEPROM_MAGIC       0x9955aabb


#define RING_NEXT(x,s)  (((x)+1) & ((s)-1))

static const u32 default_msg =
    NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK
    | NETIF_MSG_TIMER | NETIF_MSG_TX_ERR | NETIF_MSG_RX_ERR
    | NETIF_MSG_IFUP | NETIF_MSG_IFDOWN;

static int debug = -1;          /* defaults above */
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");

static int copybreak __read_mostly = 128;
module_param(copybreak, int, 0);
MODULE_PARM_DESC(copybreak, "Receive copy threshold");

static int disable_msi = 0;
module_param(disable_msi, int, 0);
MODULE_PARM_DESC(disable_msi, "Disable Message Signaled Interrupt (MSI)");

static DEFINE_PCI_DEVICE_TABLE(sky2_id_table) = {
        { PCI_DEVICE(PCI_VENDOR_ID_SYSKONNECT, 0x9000) }, /* SK-9Sxx */
        { PCI_DEVICE(PCI_VENDOR_ID_SYSKONNECT, 0x9E00) }, /* SK-9Exx */
        { PCI_DEVICE(PCI_VENDOR_ID_SYSKONNECT, 0x9E01) }, /* SK-9E21M */
        { PCI_DEVICE(PCI_VENDOR_ID_DLINK, 0x4b00) },    /* DGE-560T */
        { PCI_DEVICE(PCI_VENDOR_ID_DLINK, 0x4001) },    /* DGE-550SX */
        { PCI_DEVICE(PCI_VENDOR_ID_DLINK, 0x4B02) },    /* DGE-560SX */
        { PCI_DEVICE(PCI_VENDOR_ID_DLINK, 0x4B03) },    /* DGE-550T */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4340) }, /* 88E8021 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4341) }, /* 88E8022 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4342) }, /* 88E8061 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4343) }, /* 88E8062 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4344) }, /* 88E8021 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4345) }, /* 88E8022 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4346) }, /* 88E8061 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4347) }, /* 88E8062 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4350) }, /* 88E8035 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4351) }, /* 88E8036 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4352) }, /* 88E8038 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4353) }, /* 88E8039 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4354) }, /* 88E8040 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4355) }, /* 88E8040T */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4356) }, /* 88EC033 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4357) }, /* 88E8042 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x435A) }, /* 88E8048 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4360) }, /* 88E8052 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4361) }, /* 88E8050 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4362) }, /* 88E8053 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4363) }, /* 88E8055 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4364) }, /* 88E8056 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4365) }, /* 88E8070 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4366) }, /* 88EC036 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4367) }, /* 88EC032 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4368) }, /* 88EC034 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4369) }, /* 88EC042 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x436A) }, /* 88E8058 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x436B) }, /* 88E8071 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x436C) }, /* 88E8072 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x436D) }, /* 88E8055 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4370) }, /* 88E8075 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4380) }, /* 88E8057 */
        { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x4381) }, /* 88E8059 */
        { 0 }
};

MODULE_DEVICE_TABLE(pci, sky2_id_table);

/* Avoid conditionals by using array */
static const unsigned txqaddr[] = { Q_XA1, Q_XA2 };
static const unsigned rxqaddr[] = { Q_R1, Q_R2 };
static const u32 portirq_msk[] = { Y2_IS_PORT_1, Y2_IS_PORT_2 };

static void sky2_set_multicast(struct net_device *dev);

/* Access to PHY via serial interconnect */
static int gm_phy_write(struct sky2_hw *hw, unsigned port, u16 reg, u16 val)
{
        int i;

        gma_write16(hw, port, GM_SMI_DATA, val);
        gma_write16(hw, port, GM_SMI_CTRL,
                    GM_SMI_CT_PHY_AD(PHY_ADDR_MARV) | GM_SMI_CT_REG_AD(reg));

        for (i = 0; i < PHY_RETRIES; i++) {
                u16 ctrl = gma_read16(hw, port, GM_SMI_CTRL);
                if (ctrl == 0xffff)
                        goto io_error;

                if (!(ctrl & GM_SMI_CT_BUSY))
                        return 0;

                udelay(10);
        }

        dev_warn(&hw->pdev->dev,"%s: phy write timeout\n", hw->dev[port]->name);
        return -ETIMEDOUT;

io_error:
        dev_err(&hw->pdev->dev, "%s: phy I/O error\n", hw->dev[port]->name);
        return -EIO;
}

static int __gm_phy_read(struct sky2_hw *hw, unsigned port, u16 reg, u16 *val)
{
        int i;

        gma_write16(hw, port, GM_SMI_CTRL, GM_SMI_CT_PHY_AD(PHY_ADDR_MARV)
                    | GM_SMI_CT_REG_AD(reg) | GM_SMI_CT_OP_RD);

        for (i = 0; i < PHY_RETRIES; i++) {
                u16 ctrl = gma_read16(hw, port, GM_SMI_CTRL);
                if (ctrl == 0xffff)
                        goto io_error;

                if (ctrl & GM_SMI_CT_RD_VAL) {
                        *val = gma_read16(hw, port, GM_SMI_DATA);
                        return 0;
                }

                udelay(10);
        }

        dev_warn(&hw->pdev->dev, "%s: phy read timeout\n", hw->dev[port]->name);
        return -ETIMEDOUT;
io_error:
        dev_err(&hw->pdev->dev, "%s: phy I/O error\n", hw->dev[port]->name);
        return -EIO;
}

static inline u16 gm_phy_read(struct sky2_hw *hw, unsigned port, u16 reg)
{
        u16 v;
        __gm_phy_read(hw, port, reg, &v);
        return v;
}


static void sky2_power_on(struct sky2_hw *hw)
{
        /* switch power to VCC (WA for VAUX problem) */
        sky2_write8(hw, B0_POWER_CTRL,
                    PC_VAUX_ENA | PC_VCC_ENA | PC_VAUX_OFF | PC_VCC_ON);

        /* disable Core Clock Division, */
        sky2_write32(hw, B2_Y2_CLK_CTRL, Y2_CLK_DIV_DIS);

        if (hw->chip_id == CHIP_ID_YUKON_XL && hw->chip_rev > 1)
                /* enable bits are inverted */
                sky2_write8(hw, B2_Y2_CLK_GATE,
                            Y2_PCI_CLK_LNK1_DIS | Y2_COR_CLK_LNK1_DIS |
                            Y2_CLK_GAT_LNK1_DIS | Y2_PCI_CLK_LNK2_DIS |
                            Y2_COR_CLK_LNK2_DIS | Y2_CLK_GAT_LNK2_DIS);
        else
                sky2_write8(hw, B2_Y2_CLK_GATE, 0);

        if (hw->flags & SKY2_HW_ADV_POWER_CTL) {
                u32 reg;

                sky2_pci_write32(hw, PCI_DEV_REG3, 0);

                reg = sky2_pci_read32(hw, PCI_DEV_REG4);
                /* set all bits to 0 except bits 15..12 and 8 */
                reg &= P_ASPM_CONTROL_MSK;
                sky2_pci_write32(hw, PCI_DEV_REG4, reg);

                reg = sky2_pci_read32(hw, PCI_DEV_REG5);
                /* set all bits to 0 except bits 28 & 27 */
                reg &= P_CTL_TIM_VMAIN_AV_MSK;
                sky2_pci_write32(hw, PCI_DEV_REG5, reg);

                sky2_pci_write32(hw, PCI_CFG_REG_1, 0);

                sky2_write16(hw, B0_CTST, Y2_HW_WOL_ON);

                /* Enable workaround for dev 4.107 on Yukon-Ultra & Extreme */
                reg = sky2_read32(hw, B2_GP_IO);
                reg |= GLB_GPIO_STAT_RACE_DIS;
                sky2_write32(hw, B2_GP_IO, reg);

                sky2_read32(hw, B2_GP_IO);
        }

        /* Turn on "driver loaded" LED */
        sky2_write16(hw, B0_CTST, Y2_LED_STAT_ON);
}

static void sky2_power_aux(struct sky2_hw *hw)
{
        if (hw->chip_id == CHIP_ID_YUKON_XL && hw->chip_rev > 1)
                sky2_write8(hw, B2_Y2_CLK_GATE, 0);
        else
                /* enable bits are inverted */
                sky2_write8(hw, B2_Y2_CLK_GATE,
                            Y2_PCI_CLK_LNK1_DIS | Y2_COR_CLK_LNK1_DIS |
                            Y2_CLK_GAT_LNK1_DIS | Y2_PCI_CLK_LNK2_DIS |
                            Y2_COR_CLK_LNK2_DIS | Y2_CLK_GAT_LNK2_DIS);

        /* switch power to VAUX if supported and PME from D3cold */
        if ( (sky2_read32(hw, B0_CTST) & Y2_VAUX_AVAIL) &&
             pci_pme_capable(hw->pdev, PCI_D3cold))
                sky2_write8(hw, B0_POWER_CTRL,
                            (PC_VAUX_ENA | PC_VCC_ENA |
                             PC_VAUX_ON | PC_VCC_OFF));

        /* turn off "driver loaded LED" */
        sky2_write16(hw, B0_CTST, Y2_LED_STAT_OFF);
}

static void sky2_gmac_reset(struct sky2_hw *hw, unsigned port)
{
        u16 reg;

        /* disable all GMAC IRQ's */
        sky2_write8(hw, SK_REG(port, GMAC_IRQ_MSK), 0);

        gma_write16(hw, port, GM_MC_ADDR_H1, 0);        /* clear MC hash */
        gma_write16(hw, port, GM_MC_ADDR_H2, 0);
        gma_write16(hw, port, GM_MC_ADDR_H3, 0);
        gma_write16(hw, port, GM_MC_ADDR_H4, 0);

        reg = gma_read16(hw, port, GM_RX_CTRL);
        reg |= GM_RXCR_UCF_ENA | GM_RXCR_MCF_ENA;
        gma_write16(hw, port, GM_RX_CTRL, reg);
}

/* flow control to advertise bits */
static const u16 copper_fc_adv[] = {
        [FC_NONE]       = 0,
        [FC_TX]         = PHY_M_AN_ASP,
        [FC_RX]         = PHY_M_AN_PC,
        [FC_BOTH]       = PHY_M_AN_PC | PHY_M_AN_ASP,
};

/* flow control to advertise bits when using 1000BaseX */
static const u16 fiber_fc_adv[] = {
        [FC_NONE] = PHY_M_P_NO_PAUSE_X,
        [FC_TX]   = PHY_M_P_ASYM_MD_X,
        [FC_RX]   = PHY_M_P_SYM_MD_X,
        [FC_BOTH] = PHY_M_P_BOTH_MD_X,
};

/* flow control to GMA disable bits */
static const u16 gm_fc_disable[] = {
        [FC_NONE] = GM_GPCR_FC_RX_DIS | GM_GPCR_FC_TX_DIS,
        [FC_TX]   = GM_GPCR_FC_RX_DIS,
        [FC_RX]   = GM_GPCR_FC_TX_DIS,
        [FC_BOTH] = 0,
};


static void sky2_phy_init(struct sky2_hw *hw, unsigned port)
{
        struct sky2_port *sky2 = netdev_priv(hw->dev[port]);
        u16 ctrl, ct1000, adv, pg, ledctrl, ledover, reg;

        if ( (sky2->flags & SKY2_FLAG_AUTO_SPEED) &&
            !(hw->flags & SKY2_HW_NEWER_PHY)) {
                u16 ectrl = gm_phy_read(hw, port, PHY_MARV_EXT_CTRL);

                ectrl &= ~(PHY_M_EC_M_DSC_MSK | PHY_M_EC_S_DSC_MSK |
                           PHY_M_EC_MAC_S_MSK);
                ectrl |= PHY_M_EC_MAC_S(MAC_TX_CLK_25_MHZ);

                /* on PHY 88E1040 Rev.D0 (and newer) downshift control changed */
                if (hw->chip_id == CHIP_ID_YUKON_EC)
                        /* set downshift counter to 3x and enable downshift */
                        ectrl |= PHY_M_EC_DSC_2(2) | PHY_M_EC_DOWN_S_ENA;
                else
                        /* set master & slave downshift counter to 1x */
                        ectrl |= PHY_M_EC_M_DSC(0) | PHY_M_EC_S_DSC(1);

                gm_phy_write(hw, port, PHY_MARV_EXT_CTRL, ectrl);
        }

        ctrl = gm_phy_read(hw, port, PHY_MARV_PHY_CTRL);
        if (sky2_is_copper(hw)) {
                if (!(hw->flags & SKY2_HW_GIGABIT)) {
                        /* enable automatic crossover */
                        ctrl |= PHY_M_PC_MDI_XMODE(PHY_M_PC_ENA_AUTO) >> 1;

                        if (hw->chip_id == CHIP_ID_YUKON_FE_P &&
                            hw->chip_rev == CHIP_REV_YU_FE2_A0) {
                                u16 spec;

                                /* Enable Class A driver for FE+ A0 */
                                spec = gm_phy_read(hw, port, PHY_MARV_FE_SPEC_2);
                                spec |= PHY_M_FESC_SEL_CL_A;
                                gm_phy_write(hw, port, PHY_MARV_FE_SPEC_2, spec);
                        }
                } else {
                        /* disable energy detect */
                        ctrl &= ~PHY_M_PC_EN_DET_MSK;

                        /* enable automatic crossover */
                        ctrl |= PHY_M_PC_MDI_XMODE(PHY_M_PC_ENA_AUTO);

                        /* downshift on PHY 88E1112 and 88E1149 is changed */
                        if ( (sky2->flags & SKY2_FLAG_AUTO_SPEED) &&
                             (hw->flags & SKY2_HW_NEWER_PHY)) {
                                /* set downshift counter to 3x and enable downshift */
                                ctrl &= ~PHY_M_PC_DSC_MSK;
                                ctrl |= PHY_M_PC_DSC(2) | PHY_M_PC_DOWN_S_ENA;
                        }
                }
        } else {
                /* workaround for deviation #4.88 (CRC errors) */
                /* disable Automatic Crossover */

                ctrl &= ~PHY_M_PC_MDIX_MSK;
        }

        gm_phy_write(hw, port, PHY_MARV_PHY_CTRL, ctrl);

        /* special setup for PHY 88E1112 Fiber */
        if (hw->chip_id == CHIP_ID_YUKON_XL && (hw->flags & SKY2_HW_FIBRE_PHY)) {
                pg = gm_phy_read(hw, port, PHY_MARV_EXT_ADR);

                /* Fiber: select 1000BASE-X only mode MAC Specific Ctrl Reg. */
                gm_phy_write(hw, port, PHY_MARV_EXT_ADR, 2);
                ctrl = gm_phy_read(hw, port, PHY_MARV_PHY_CTRL);
                ctrl &= ~PHY_M_MAC_MD_MSK;
                ctrl |= PHY_M_MAC_MODE_SEL(PHY_M_MAC_MD_1000BX);
                gm_phy_write(hw, port, PHY_MARV_PHY_CTRL, ctrl);

                if (hw->pmd_type  == 'P') {
                        /* select page 1 to access Fiber registers */
                        gm_phy_write(hw, port, PHY_MARV_EXT_ADR, 1);

                        /* for SFP-module set SIGDET polarity to low */
                        ctrl = gm_phy_read(hw, port, PHY_MARV_PHY_CTRL);
                        ctrl |= PHY_M_FIB_SIGD_POL;
                        gm_phy_write(hw, port, PHY_MARV_PHY_CTRL, ctrl);
                }

                gm_phy_write(hw, port, PHY_MARV_EXT_ADR, pg);
        }

        ctrl = PHY_CT_RESET;
        ct1000 = 0;
        adv = PHY_AN_CSMA;
        reg = 0;

        if (sky2->flags & SKY2_FLAG_AUTO_SPEED) {
                if (sky2_is_copper(hw)) {
                        if (sky2->advertising & ADVERTISED_1000baseT_Full)
                                ct1000 |= PHY_M_1000C_AFD;
                        if (sky2->advertising & ADVERTISED_1000baseT_Half)
                                ct1000 |= PHY_M_1000C_AHD;
                        if (sky2->advertising & ADVERTISED_100baseT_Full)
                                adv |= PHY_M_AN_100_FD;
                        if (sky2->advertising & ADVERTISED_100baseT_Half)
                                adv |= PHY_M_AN_100_HD;
                        if (sky2->advertising & ADVERTISED_10baseT_Full)
                                adv |= PHY_M_AN_10_FD;
                        if (sky2->advertising & ADVERTISED_10baseT_Half)
                                adv |= PHY_M_AN_10_HD;

                } else {        /* special defines for FIBER (88E1040S only) */
                        if (sky2->advertising & ADVERTISED_1000baseT_Full)
                                adv |= PHY_M_AN_1000X_AFD;
                        if (sky2->advertising & ADVERTISED_1000baseT_Half)
                                adv |= PHY_M_AN_1000X_AHD;
                }

                /* Restart Auto-negotiation */
                ctrl |= PHY_CT_ANE | PHY_CT_RE_CFG;
        } else {
                /* forced speed/duplex settings */
                ct1000 = PHY_M_1000C_MSE;

                /* Disable auto update for duplex flow control and duplex */
                reg |= GM_GPCR_AU_DUP_DIS | GM_GPCR_AU_SPD_DIS;

                switch (sky2->speed) {
                case SPEED_1000:
                        ctrl |= PHY_CT_SP1000;
                        reg |= GM_GPCR_SPEED_1000;
                        break;
                case SPEED_100:
                        ctrl |= PHY_CT_SP100;
                        reg |= GM_GPCR_SPEED_100;
                        break;
                }

                if (sky2->duplex == DUPLEX_FULL) {
                        reg |= GM_GPCR_DUP_FULL;
                        ctrl |= PHY_CT_DUP_MD;
                } else if (sky2->speed < SPEED_1000)
                        sky2->flow_mode = FC_NONE;
        }

        if (sky2->flags & SKY2_FLAG_AUTO_PAUSE) {
                if (sky2_is_copper(hw))
                        adv |= copper_fc_adv[sky2->flow_mode];
                else
                        adv |= fiber_fc_adv[sky2->flow_mode];
        } else {
                reg |= GM_GPCR_AU_FCT_DIS;
                reg |= gm_fc_disable[sky2->flow_mode];

                /* Forward pause packets to GMAC? */
                if (sky2->flow_mode & FC_RX)
                        sky2_write8(hw, SK_REG(port, GMAC_CTRL), GMC_PAUSE_ON);
                else
                        sky2_write8(hw, SK_REG(port, GMAC_CTRL), GMC_PAUSE_OFF);
        }

        gma_write16(hw, port, GM_GP_CTRL, reg);

        if (hw->flags & SKY2_HW_GIGABIT)
                gm_phy_write(hw, port, PHY_MARV_1000T_CTRL, ct1000);

        gm_phy_write(hw, port, PHY_MARV_AUNE_ADV, adv);
        gm_phy_write(hw, port, PHY_MARV_CTRL, ctrl);

        /* Setup Phy LED's */
        ledctrl = PHY_M_LED_PULS_DUR(PULS_170MS);
        ledover = 0;

        switch (hw->chip_id) {
        case CHIP_ID_YUKON_FE:
                /* on 88E3082 these bits are at 11..9 (shifted left) */
                ledctrl |= PHY_M_LED_BLINK_RT(BLINK_84MS) << 1;

                ctrl = gm_phy_read(hw, port, PHY_MARV_FE_LED_PAR);

                /* delete ACT LED control bits */
                ctrl &= ~PHY_M_FELP_LED1_MSK;
                /* change ACT LED control to blink mode */
                ctrl |= PHY_M_FELP_LED1_CTRL(LED_PAR_CTRL_ACT_BL);
                gm_phy_write(hw, port, PHY_MARV_FE_LED_PAR, ctrl);
                break;

        case CHIP_ID_YUKON_FE_P:
                /* Enable Link Partner Next Page */
                ctrl = gm_phy_read(hw, port, PHY_MARV_PHY_CTRL);
                ctrl |= PHY_M_PC_ENA_LIP_NP;

                /* disable Energy Detect and enable scrambler */
                ctrl &= ~(PHY_M_PC_ENA_ENE_DT | PHY_M_PC_DIS_SCRAMB);
                gm_phy_write(hw, port, PHY_MARV_PHY_CTRL, ctrl);

                /* set LED2 -> ACT, LED1 -> LINK, LED0 -> SPEED */
                ctrl = PHY_M_FELP_LED2_CTRL(LED_PAR_CTRL_ACT_BL) |
                        PHY_M_FELP_LED1_CTRL(LED_PAR_CTRL_LINK) |
                        PHY_M_FELP_LED0_CTRL(LED_PAR_CTRL_SPEED);

                gm_phy_write(hw, port, PHY_MARV_FE_LED_PAR, ctrl);
                break;

        case CHIP_ID_YUKON_XL:
                pg = gm_phy_read(hw, port, PHY_MARV_EXT_ADR);

                /* select page 3 to access LED control register */
                gm_phy_write(hw, port, PHY_MARV_EXT_ADR, 3);

                /* set LED Function Control register */
                gm_phy_write(hw, port, PHY_MARV_PHY_CTRL,
                             (PHY_M_LEDC_LOS_CTRL(1) |  /* LINK/ACT */
                              PHY_M_LEDC_INIT_CTRL(7) | /* 10 Mbps */
                              PHY_M_LEDC_STA1_CTRL(7) | /* 100 Mbps */
                              PHY_M_LEDC_STA0_CTRL(7)));        /* 1000 Mbps */

                /* set Polarity Control register */
                gm_phy_write(hw, port, PHY_MARV_PHY_STAT,
                             (PHY_M_POLC_LS1_P_MIX(4) |
                              PHY_M_POLC_IS0_P_MIX(4) |
                              PHY_M_POLC_LOS_CTRL(2) |
                              PHY_M_POLC_INIT_CTRL(2) |
                              PHY_M_POLC_STA1_CTRL(2) |
                              PHY_M_POLC_STA0_CTRL(2)));

                /* restore page register */
                gm_phy_write(hw, port, PHY_MARV_EXT_ADR, pg);
                break;

        case CHIP_ID_YUKON_EC_U:
        case CHIP_ID_YUKON_EX:
        case CHIP_ID_YUKON_SUPR:
                pg = gm_phy_read(hw, port, PHY_MARV_EXT_ADR);

                /* select page 3 to access LED control register */
                gm_phy_write(hw, port, PHY_MARV_EXT_ADR, 3);

                /* set LED Function Control register */
                gm_phy_write(hw, port, PHY_MARV_PHY_CTRL,
                             (PHY_M_LEDC_LOS_CTRL(1) |  /* LINK/ACT */
                              PHY_M_LEDC_INIT_CTRL(8) | /* 10 Mbps */
                              PHY_M_LEDC_STA1_CTRL(7) | /* 100 Mbps */
                              PHY_M_LEDC_STA0_CTRL(7)));/* 1000 Mbps */

                /* set Blink Rate in LED Timer Control Register */
                gm_phy_write(hw, port, PHY_MARV_INT_MASK,
                             ledctrl | PHY_M_LED_BLINK_RT(BLINK_84MS));
                /* restore page register */
                gm_phy_write(hw, port, PHY_MARV_EXT_ADR, pg);
                break;

        default:
                /* set Tx LED (LED_TX) to blink mode on Rx OR Tx activity */
                ledctrl |= PHY_M_LED_BLINK_RT(BLINK_84MS) | PHY_M_LEDC_TX_CTRL;

                /* turn off the Rx LED (LED_RX) */
                ledover |= PHY_M_LED_MO_RX(MO_LED_OFF);
        }

        if (hw->chip_id == CHIP_ID_YUKON_EC_U || hw->chip_id == CHIP_ID_YUKON_UL_2) {
                /* apply fixes in PHY AFE */
                gm_phy_write(hw, port, PHY_MARV_EXT_ADR, 255);

                /* increase differential signal amplitude in 10BASE-T */
                gm_phy_write(hw, port, 0x18, 0xaa99);
                gm_phy_write(hw, port, 0x17, 0x2011);

                if (hw->chip_id == CHIP_ID_YUKON_EC_U) {
                        /* fix for IEEE A/B Symmetry failure in 1000BASE-T */
                        gm_phy_write(hw, port, 0x18, 0xa204);
                        gm_phy_write(hw, port, 0x17, 0x2002);
                }

                /* set page register to 0 */
                gm_phy_write(hw, port, PHY_MARV_EXT_ADR, 0);
        } else if (hw->chip_id == CHIP_ID_YUKON_FE_P &&
                   hw->chip_rev == CHIP_REV_YU_FE2_A0) {
                /* apply workaround for integrated resistors calibration */
                gm_phy_write(hw, port, PHY_MARV_PAGE_ADDR, 17);
                gm_phy_write(hw, port, PHY_MARV_PAGE_DATA, 0x3f60);
        } else if (hw->chip_id == CHIP_ID_YUKON_OPT && hw->chip_rev == 0) {
                /* apply fixes in PHY AFE */
                gm_phy_write(hw, port, PHY_MARV_EXT_ADR, 0x00ff);

                /* apply RDAC termination workaround */
                gm_phy_write(hw, port, 24, 0x2800);
                gm_phy_write(hw, port, 23, 0x2001);

                /* set page register back to 0 */
                gm_phy_write(hw, port, PHY_MARV_EXT_ADR, 0);
        } else if (hw->chip_id != CHIP_ID_YUKON_EX &&
                   hw->chip_id < CHIP_ID_YUKON_SUPR) {
                /* no effect on Yukon-XL */
                gm_phy_write(hw, port, PHY_MARV_LED_CTRL, ledctrl);

                if (!(sky2->flags & SKY2_FLAG_AUTO_SPEED) ||
                    sky2->speed == SPEED_100) {
                        /* turn on 100 Mbps LED (LED_LINK100) */
                        ledover |= PHY_M_LED_MO_100(MO_LED_ON);
                }

                if (ledover)
                        gm_phy_write(hw, port, PHY_MARV_LED_OVER, ledover);

        }

        /* Enable phy interrupt on auto-negotiation complete (or link up) */
        if (sky2->flags & SKY2_FLAG_AUTO_SPEED)
                gm_phy_write(hw, port, PHY_MARV_INT_MASK, PHY_M_IS_AN_COMPL);
        else
                gm_phy_write(hw, port, PHY_MARV_INT_MASK, PHY_M_DEF_MSK);
}

static const u32 phy_power[] = { PCI_Y2_PHY1_POWD, PCI_Y2_PHY2_POWD };
static const u32 coma_mode[] = { PCI_Y2_PHY1_COMA, PCI_Y2_PHY2_COMA };

static void sky2_phy_power_up(struct sky2_hw *hw, unsigned port)
{
        u32 reg1;

        sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_ON);
        reg1 = sky2_pci_read32(hw, PCI_DEV_REG1);
        reg1 &= ~phy_power[port];

        if (hw->chip_id == CHIP_ID_YUKON_XL && hw->chip_rev > 1)
                reg1 |= coma_mode[port];

        sky2_pci_write32(hw, PCI_DEV_REG1, reg1);
        sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_OFF);
        sky2_pci_read32(hw, PCI_DEV_REG1);

        if (hw->chip_id == CHIP_ID_YUKON_FE)
                gm_phy_write(hw, port, PHY_MARV_CTRL, PHY_CT_ANE);
        else if (hw->flags & SKY2_HW_ADV_POWER_CTL)
                sky2_write8(hw, SK_REG(port, GPHY_CTRL), GPC_RST_CLR);
}

static void sky2_phy_power_down(struct sky2_hw *hw, unsigned port)
{
        u32 reg1;
        u16 ctrl;

        /* release GPHY Control reset */
        sky2_write8(hw, SK_REG(port, GPHY_CTRL), GPC_RST_CLR);

        /* release GMAC reset */
        sky2_write8(hw, SK_REG(port, GMAC_CTRL), GMC_RST_CLR);

        if (hw->flags & SKY2_HW_NEWER_PHY) {
                /* select page 2 to access MAC control register */
                gm_phy_write(hw, port, PHY_MARV_EXT_ADR, 2);

                ctrl = gm_phy_read(hw, port, PHY_MARV_PHY_CTRL);
                /* allow GMII Power Down */
                ctrl &= ~PHY_M_MAC_GMIF_PUP;
                gm_phy_write(hw, port, PHY_MARV_PHY_CTRL, ctrl);

                /* set page register back to 0 */
                gm_phy_write(hw, port, PHY_MARV_EXT_ADR, 0);
        }

        /* setup General Purpose Control Register */
        gma_write16(hw, port, GM_GP_CTRL,
                    GM_GPCR_FL_PASS | GM_GPCR_SPEED_100 |
                    GM_GPCR_AU_DUP_DIS | GM_GPCR_AU_FCT_DIS |
                    GM_GPCR_AU_SPD_DIS);

        if (hw->chip_id != CHIP_ID_YUKON_EC) {
                if (hw->chip_id == CHIP_ID_YUKON_EC_U) {
                        /* select page 2 to access MAC control register */
                        gm_phy_write(hw, port, PHY_MARV_EXT_ADR, 2);

                        ctrl = gm_phy_read(hw, port, PHY_MARV_PHY_CTRL);
                        /* enable Power Down */
                        ctrl |= PHY_M_PC_POW_D_ENA;
                        gm_phy_write(hw, port, PHY_MARV_PHY_CTRL, ctrl);

                        /* set page register back to 0 */
                        gm_phy_write(hw, port, PHY_MARV_EXT_ADR, 0);
                }

                /* set IEEE compatible Power Down Mode (dev. #4.99) */
                gm_phy_write(hw, port, PHY_MARV_CTRL, PHY_CT_PDOWN);
        }

        sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_ON);
        reg1 = sky2_pci_read32(hw, PCI_DEV_REG1);
        reg1 |= phy_power[port];                /* set PHY to PowerDown/COMA Mode */
        sky2_pci_write32(hw, PCI_DEV_REG1, reg1);
        sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_OFF);
}

/* Force a renegotiation */
static void sky2_phy_reinit(struct sky2_port *sky2)
{
        spin_lock_bh(&sky2->phy_lock);
        sky2_phy_init(sky2->hw, sky2->port);
        spin_unlock_bh(&sky2->phy_lock);
}

/* Put device in state to listen for Wake On Lan */
static void sky2_wol_init(struct sky2_port *sky2)
{
        struct sky2_hw *hw = sky2->hw;
        unsigned port = sky2->port;
        enum flow_control save_mode;
        u16 ctrl;

        /* Bring hardware out of reset */
        sky2_write16(hw, B0_CTST, CS_RST_CLR);
        sky2_write16(hw, SK_REG(port, GMAC_LINK_CTRL), GMLC_RST_CLR);

        sky2_write8(hw, SK_REG(port, GPHY_CTRL), GPC_RST_CLR);
        sky2_write8(hw, SK_REG(port, GMAC_CTRL), GMC_RST_CLR);

        /* Force to 10/100
         * sky2_reset will re-enable on resume
         */
        save_mode = sky2->flow_mode;
        ctrl = sky2->advertising;

        sky2->advertising &= ~(ADVERTISED_1000baseT_Half|ADVERTISED_1000baseT_Full);
        sky2->flow_mode = FC_NONE;

        spin_lock_bh(&sky2->phy_lock);
        sky2_phy_power_up(hw, port);
        sky2_phy_init(hw, port);
        spin_unlock_bh(&sky2->phy_lock);

        sky2->flow_mode = save_mode;
        sky2->advertising = ctrl;

        /* Set GMAC to no flow control and auto update for speed/duplex */
        gma_write16(hw, port, GM_GP_CTRL,
                    GM_GPCR_FC_TX_DIS|GM_GPCR_TX_ENA|GM_GPCR_RX_ENA|
                    GM_GPCR_DUP_FULL|GM_GPCR_FC_RX_DIS|GM_GPCR_AU_FCT_DIS);

        /* Set WOL address */
        memcpy_toio(hw->regs + WOL_REGS(port, WOL_MAC_ADDR),
                    sky2->netdev->dev_addr, ETH_ALEN);

        /* Turn on appropriate WOL control bits */
        sky2_write16(hw, WOL_REGS(port, WOL_CTRL_STAT), WOL_CTL_CLEAR_RESULT);
        ctrl = 0;
        if (sky2->wol & WAKE_PHY)
                ctrl |= WOL_CTL_ENA_PME_ON_LINK_CHG|WOL_CTL_ENA_LINK_CHG_UNIT;
        else
                ctrl |= WOL_CTL_DIS_PME_ON_LINK_CHG|WOL_CTL_DIS_LINK_CHG_UNIT;

        if (sky2->wol & WAKE_MAGIC)
                ctrl |= WOL_CTL_ENA_PME_ON_MAGIC_PKT|WOL_CTL_ENA_MAGIC_PKT_UNIT;
        else
                ctrl |= WOL_CTL_DIS_PME_ON_MAGIC_PKT|WOL_CTL_DIS_MAGIC_PKT_UNIT;

        ctrl |= WOL_CTL_DIS_PME_ON_PATTERN|WOL_CTL_DIS_PATTERN_UNIT;
        sky2_write16(hw, WOL_REGS(port, WOL_CTRL_STAT), ctrl);

        /* Disable PiG firmware */
        sky2_write16(hw, B0_CTST, Y2_HW_WOL_OFF);

        /* block receiver */
        sky2_write8(hw, SK_REG(port, RX_GMF_CTRL_T), GMF_RST_SET);
}

static void sky2_set_tx_stfwd(struct sky2_hw *hw, unsigned port)
{
        struct net_device *dev = hw->dev[port];

        if ( (hw->chip_id == CHIP_ID_YUKON_EX &&
              hw->chip_rev != CHIP_REV_YU_EX_A0) ||
             hw->chip_id >= CHIP_ID_YUKON_FE_P) {
                /* Yukon-Extreme B0 and further Extreme devices */
                sky2_write32(hw, SK_REG(port, TX_GMF_CTRL_T), TX_STFW_ENA);
        } else if (dev->mtu > ETH_DATA_LEN) {
                /* set Tx GMAC FIFO Almost Empty Threshold */
                sky2_write32(hw, SK_REG(port, TX_GMF_AE_THR),
                             (ECU_JUMBO_WM << 16) | ECU_AE_THR);

                sky2_write32(hw, SK_REG(port, TX_GMF_CTRL_T), TX_STFW_DIS);
        } else
                sky2_write32(hw, SK_REG(port, TX_GMF_CTRL_T), TX_STFW_ENA);
}

static void sky2_mac_init(struct sky2_hw *hw, unsigned port)
{
        struct sky2_port *sky2 = netdev_priv(hw->dev[port]);
        u16 reg;
        u32 rx_reg;
        int i;
        const u8 *addr = hw->dev[port]->dev_addr;

        sky2_write8(hw, SK_REG(port, GPHY_CTRL), GPC_RST_SET);
        sky2_write8(hw, SK_REG(port, GPHY_CTRL), GPC_RST_CLR);

        sky2_write8(hw, SK_REG(port, GMAC_CTRL), GMC_RST_CLR);

        if (hw->chip_id == CHIP_ID_YUKON_XL && hw->chip_rev == 0 && port == 1) {
                /* WA DEV_472 -- looks like crossed wires on port 2 */
                /* clear GMAC 1 Control reset */
                sky2_write8(hw, SK_REG(0, GMAC_CTRL), GMC_RST_CLR);
                do {
                        sky2_write8(hw, SK_REG(1, GMAC_CTRL), GMC_RST_SET);
                        sky2_write8(hw, SK_REG(1, GMAC_CTRL), GMC_RST_CLR);
                } while (gm_phy_read(hw, 1, PHY_MARV_ID0) != PHY_MARV_ID0_VAL ||
                         gm_phy_read(hw, 1, PHY_MARV_ID1) != PHY_MARV_ID1_Y2 ||
                         gm_phy_read(hw, 1, PHY_MARV_INT_MASK) != 0);
        }

        sky2_read16(hw, SK_REG(port, GMAC_IRQ_SRC));

        /* Enable Transmit FIFO Underrun */
        sky2_write8(hw, SK_REG(port, GMAC_IRQ_MSK), GMAC_DEF_MSK);

        spin_lock_bh(&sky2->phy_lock);
        sky2_phy_power_up(hw, port);
        sky2_phy_init(hw, port);
        spin_unlock_bh(&sky2->phy_lock);

        /* MIB clear */
        reg = gma_read16(hw, port, GM_PHY_ADDR);
        gma_write16(hw, port, GM_PHY_ADDR, reg | GM_PAR_MIB_CLR);

        for (i = GM_MIB_CNT_BASE; i <= GM_MIB_CNT_END; i += 4)
                gma_read16(hw, port, i);
        gma_write16(hw, port, GM_PHY_ADDR, reg);

        /* transmit control */
        gma_write16(hw, port, GM_TX_CTRL, TX_COL_THR(TX_COL_DEF));

        /* receive control reg: unicast + multicast + no FCS  */
        gma_write16(hw, port, GM_RX_CTRL,
                    GM_RXCR_UCF_ENA | GM_RXCR_CRC_DIS | GM_RXCR_MCF_ENA);

        /* transmit flow control */
        gma_write16(hw, port, GM_TX_FLOW_CTRL, 0xffff);

        /* transmit parameter */
        gma_write16(hw, port, GM_TX_PARAM,
                    TX_JAM_LEN_VAL(TX_JAM_LEN_DEF) |
                    TX_JAM_IPG_VAL(TX_JAM_IPG_DEF) |
                    TX_IPG_JAM_DATA(TX_IPG_JAM_DEF) |
                    TX_BACK_OFF_LIM(TX_BOF_LIM_DEF));

        /* serial mode register */
        reg = DATA_BLIND_VAL(DATA_BLIND_DEF) |
                GM_SMOD_VLAN_ENA | IPG_DATA_VAL(IPG_DATA_DEF);

        if (hw->dev[port]->mtu > ETH_DATA_LEN)
                reg |= GM_SMOD_JUMBO_ENA;

        gma_write16(hw, port, GM_SERIAL_MODE, reg);

        /* virtual address for data */
        gma_set_addr(hw, port, GM_SRC_ADDR_2L, addr);

        /* physical address: used for pause frames */
        gma_set_addr(hw, port, GM_SRC_ADDR_1L, addr);

        /* ignore counter overflows */
        gma_write16(hw, port, GM_TX_IRQ_MSK, 0);
        gma_write16(hw, port, GM_RX_IRQ_MSK, 0);
        gma_write16(hw, port, GM_TR_IRQ_MSK, 0);

        /* Configure Rx MAC FIFO */
        sky2_write8(hw, SK_REG(port, RX_GMF_CTRL_T), GMF_RST_CLR);
        rx_reg = GMF_OPER_ON | GMF_RX_F_FL_ON;
        if (hw->chip_id == CHIP_ID_YUKON_EX ||
            hw->chip_id == CHIP_ID_YUKON_FE_P)
                rx_reg |= GMF_RX_OVER_ON;

        sky2_write32(hw, SK_REG(port, RX_GMF_CTRL_T), rx_reg);

        if (hw->chip_id == CHIP_ID_YUKON_XL) {
                /* Hardware errata - clear flush mask */
                sky2_write16(hw, SK_REG(port, RX_GMF_FL_MSK), 0);
        } else {
                /* Flush Rx MAC FIFO on any flow control or error */
                sky2_write16(hw, SK_REG(port, RX_GMF_FL_MSK), GMR_FS_ANY_ERR);
        }

        /* Set threshold to 0xa (64 bytes) + 1 to workaround pause bug  */
        reg = RX_GMF_FL_THR_DEF + 1;
        /* Another magic mystery workaround from sk98lin */
        if (hw->chip_id == CHIP_ID_YUKON_FE_P &&
            hw->chip_rev == CHIP_REV_YU_FE2_A0)
                reg = 0x178;
        sky2_write16(hw, SK_REG(port, RX_GMF_FL_THR), reg);

        /* Configure Tx MAC FIFO */
        sky2_write8(hw, SK_REG(port, TX_GMF_CTRL_T), GMF_RST_CLR);
        sky2_write16(hw, SK_REG(port, TX_GMF_CTRL_T), GMF_OPER_ON);

        /* On chips without ram buffer, pause is controled by MAC level */
        if (!(hw->flags & SKY2_HW_RAM_BUFFER)) {
                /* Pause threshold is scaled by 8 in bytes */
                if (hw->chip_id == CHIP_ID_YUKON_FE_P &&
                    hw->chip_rev == CHIP_REV_YU_FE2_A0)
                        reg = 1568 / 8;
                else
                        reg = 1024 / 8;
                sky2_write16(hw, SK_REG(port, RX_GMF_UP_THR), reg);
                sky2_write16(hw, SK_REG(port, RX_GMF_LP_THR), 768 / 8);

                sky2_set_tx_stfwd(hw, port);
        }

        if (hw->chip_id == CHIP_ID_YUKON_FE_P &&
            hw->chip_rev == CHIP_REV_YU_FE2_A0) {
                /* disable dynamic watermark */
                reg = sky2_read16(hw, SK_REG(port, TX_GMF_EA));
                reg &= ~TX_DYN_WM_ENA;
                sky2_write16(hw, SK_REG(port, TX_GMF_EA), reg);
        }
}

/* Assign Ram Buffer allocation to queue */
static void sky2_ramset(struct sky2_hw *hw, u16 q, u32 start, u32 space)
{
        u32 end;

        /* convert from K bytes to qwords used for hw register */
        start *= 1024/8;
        space *= 1024/8;
        end = start + space - 1;

        sky2_write8(hw, RB_ADDR(q, RB_CTRL), RB_RST_CLR);
        sky2_write32(hw, RB_ADDR(q, RB_START), start);
        sky2_write32(hw, RB_ADDR(q, RB_END), end);
        sky2_write32(hw, RB_ADDR(q, RB_WP), start);
        sky2_write32(hw, RB_ADDR(q, RB_RP), start);

        if (q == Q_R1 || q == Q_R2) {
                u32 tp = space - space/4;

                /* On receive queue's set the thresholds
                 * give receiver priority when > 3/4 full
                 * send pause when down to 2K
                 */
                sky2_write32(hw, RB_ADDR(q, RB_RX_UTHP), tp);
                sky2_write32(hw, RB_ADDR(q, RB_RX_LTHP), space/2);

                tp = space - 2048/8;
                sky2_write32(hw, RB_ADDR(q, RB_RX_UTPP), tp);
                sky2_write32(hw, RB_ADDR(q, RB_RX_LTPP), space/4);
        } else {
                /* Enable store & forward on Tx queue's because
                 * Tx FIFO is only 1K on Yukon
                 */
                sky2_write8(hw, RB_ADDR(q, RB_CTRL), RB_ENA_STFWD);
        }

        sky2_write8(hw, RB_ADDR(q, RB_CTRL), RB_ENA_OP_MD);
        sky2_read8(hw, RB_ADDR(q, RB_CTRL));
}

/* Setup Bus Memory Interface */
static void sky2_qset(struct sky2_hw *hw, u16 q)
{
        sky2_write32(hw, Q_ADDR(q, Q_CSR), BMU_CLR_RESET);
        sky2_write32(hw, Q_ADDR(q, Q_CSR), BMU_OPER_INIT);
        sky2_write32(hw, Q_ADDR(q, Q_CSR), BMU_FIFO_OP_ON);
        sky2_write32(hw, Q_ADDR(q, Q_WM),  BMU_WM_DEFAULT);
}

/* Setup prefetch unit registers. This is the interface between
 * hardware and driver list elements
 */
static void sky2_prefetch_init(struct sky2_hw *hw, u32 qaddr,
                               dma_addr_t addr, u32 last)
{
        sky2_write32(hw, Y2_QADDR(qaddr, PREF_UNIT_CTRL), PREF_UNIT_RST_SET);
        sky2_write32(hw, Y2_QADDR(qaddr, PREF_UNIT_CTRL), PREF_UNIT_RST_CLR);
        sky2_write32(hw, Y2_QADDR(qaddr, PREF_UNIT_ADDR_HI), upper_32_bits(addr));
        sky2_write32(hw, Y2_QADDR(qaddr, PREF_UNIT_ADDR_LO), lower_32_bits(addr));
        sky2_write16(hw, Y2_QADDR(qaddr, PREF_UNIT_LAST_IDX), last);
        sky2_write32(hw, Y2_QADDR(qaddr, PREF_UNIT_CTRL), PREF_UNIT_OP_ON);

        sky2_read32(hw, Y2_QADDR(qaddr, PREF_UNIT_CTRL));
}

static inline struct sky2_tx_le *get_tx_le(struct sky2_port *sky2, u16 *slot)
{
        struct sky2_tx_le *le = sky2->tx_le + *slot;

        *slot = RING_NEXT(*slot, sky2->tx_ring_size);
        le->ctrl = 0;
        return le;
}

static void tx_init(struct sky2_port *sky2)
{
        struct sky2_tx_le *le;

        sky2->tx_prod = sky2->tx_cons = 0;
        sky2->tx_tcpsum = 0;
        sky2->tx_last_mss = 0;

        le = get_tx_le(sky2, &sky2->tx_prod);
        le->addr = 0;
        le->opcode = OP_ADDR64 | HW_OWNER;
        sky2->tx_last_upper = 0;
}

/* Update chip's next pointer */
static inline void sky2_put_idx(struct sky2_hw *hw, unsigned q, u16 idx)
{
        /* Make sure write' to descriptors are complete before we tell hardware */
        wmb();
        sky2_write16(hw, Y2_QADDR(q, PREF_UNIT_PUT_IDX), idx);

        /* Synchronize I/O on since next processor may write to tail */
        mmiowb();
}


static inline struct sky2_rx_le *sky2_next_rx(struct sky2_port *sky2)
{
        struct sky2_rx_le *le = sky2->rx_le + sky2->rx_put;
        sky2->rx_put = RING_NEXT(sky2->rx_put, RX_LE_SIZE);
        le->ctrl = 0;
        return le;
}

static unsigned sky2_get_rx_threshold(struct sky2_port* sky2)
{
        unsigned size;

        /* Space needed for frame data + headers rounded up */
        size = roundup(sky2->netdev->mtu + ETH_HLEN + VLAN_HLEN, 8);

        /* Stopping point for hardware truncation */
        return (size - 8) / sizeof(u32);
}

static unsigned sky2_get_rx_data_size(struct sky2_port* sky2)
{
        struct rx_ring_info *re;
        unsigned size;

        /* Space needed for frame data + headers rounded up */
        size = roundup(sky2->netdev->mtu + ETH_HLEN + VLAN_HLEN, 8);

        sky2->rx_nfrags = size >> PAGE_SHIFT;
        BUG_ON(sky2->rx_nfrags > ARRAY_SIZE(re->frag_addr));

        /* Compute residue after pages */
        size -= sky2->rx_nfrags << PAGE_SHIFT;

        /* Optimize to handle small packets and headers */
        if (size < copybreak)
                size = copybreak;
        if (size < ETH_HLEN)
                size = ETH_HLEN;

        return size;
}

/* Build description to hardware for one receive segment */
static void sky2_rx_add(struct sky2_port *sky2,  u8 op,
                        dma_addr_t map, unsigned len)
{
        struct sky2_rx_le *le;

        if (sizeof(dma_addr_t) > sizeof(u32)) {
                le = sky2_next_rx(sky2);
                le->addr = cpu_to_le32(upper_32_bits(map));
                le->opcode = OP_ADDR64 | HW_OWNER;
        }

        le = sky2_next_rx(sky2);
        le->addr = cpu_to_le32(lower_32_bits(map));
        le->length = cpu_to_le16(len);
        le->opcode = op | HW_OWNER;
}

/* Build description to hardware for one possibly fragmented skb */
static void sky2_rx_submit(struct sky2_port *sky2,
                           const struct rx_ring_info *re)
{
        int i;

        sky2_rx_add(sky2, OP_PACKET, re->data_addr, sky2->rx_data_size);

        for (i = 0; i < skb_shinfo(re->skb)->nr_frags; i++)
                sky2_rx_add(sky2, OP_BUFFER, re->frag_addr[i], PAGE_SIZE);
}


static int sky2_rx_map_skb(struct pci_dev *pdev, struct rx_ring_info *re,
                            unsigned size)
{
        struct sk_buff *skb = re->skb;
        int i;

        re->data_addr = pci_map_single(pdev, skb->data, size, PCI_DMA_FROMDEVICE);
        if (pci_dma_mapping_error(pdev, re->data_addr))
                goto mapping_error;

        pci_unmap_len_set(re, data_size, size);

        for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
                skb_frag_t *frag = &skb_shinfo(skb)->frags[i];

                re->frag_addr[i] = pci_map_page(pdev, frag->page,
                                                frag->page_offset,
                                                frag->size,
                                                PCI_DMA_FROMDEVICE);

                if (pci_dma_mapping_error(pdev, re->frag_addr[i]))
                        goto map_page_error;
        }
        return 0;

map_page_error:
        while (--i >= 0) {
                pci_unmap_page(pdev, re->frag_addr[i],
                               skb_shinfo(skb)->frags[i].size,
                               PCI_DMA_FROMDEVICE);
        }

        pci_unmap_single(pdev, re->data_addr, pci_unmap_len(re, data_size),
                         PCI_DMA_FROMDEVICE);

mapping_error:
        if (net_ratelimit())
                dev_warn(&pdev->dev, "%s: rx mapping error\n",
                         skb->dev->name);
        return -EIO;
}

static void sky2_rx_unmap_skb(struct pci_dev *pdev, struct rx_ring_info *re)
{
        struct sk_buff *skb = re->skb;
        int i;

        pci_unmap_single(pdev, re->data_addr, pci_unmap_len(re, data_size),
                         PCI_DMA_FROMDEVICE);

        for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
                pci_unmap_page(pdev, re->frag_addr[i],
                               skb_shinfo(skb)->frags[i].size,
                               PCI_DMA_FROMDEVICE);
}

/* Tell chip where to start receive checksum.
 * Actually has two checksums, but set both same to avoid possible byte
 * order problems.
 */
static void rx_set_checksum(struct sky2_port *sky2)
{
        struct sky2_rx_le *le = sky2_next_rx(sky2);

        le->addr = cpu_to_le32((ETH_HLEN << 16) | ETH_HLEN);
        le->ctrl = 0;
        le->opcode = OP_TCPSTART | HW_OWNER;

        sky2_write32(sky2->hw,
                     Q_ADDR(rxqaddr[sky2->port], Q_CSR),
                     (sky2->flags & SKY2_FLAG_RX_CHECKSUM)
                     ? BMU_ENA_RX_CHKSUM : BMU_DIS_RX_CHKSUM);
}

/*
 * The RX Stop command will not work for Yukon-2 if the BMU does not
 * reach the end of packet and since we can't make sure that we have
 * incoming data, we must reset the BMU while it is not doing a DMA
 * transfer. Since it is possible that the RX path is still active,
 * the RX RAM buffer will be stopped first, so any possible incoming
 * data will not trigger a DMA. After the RAM buffer is stopped, the
 * BMU is polled until any DMA in progress is ended and only then it
 * will be reset.
 */
static void sky2_rx_stop(struct sky2_port *sky2)
{
        struct sky2_hw *hw = sky2->hw;
        unsigned rxq = rxqaddr[sky2->port];
        int i;

        /* disable the RAM Buffer receive queue */
        sky2_write8(hw, RB_ADDR(rxq, RB_CTRL), RB_DIS_OP_MD);

        for (i = 0; i < 0xffff; i++)
                if (sky2_read8(hw, RB_ADDR(rxq, Q_RSL))
                    == sky2_read8(hw, RB_ADDR(rxq, Q_RL)))
                        goto stopped;

        printk(KERN_WARNING PFX "%s: receiver stop failed\n",
               sky2->netdev->name);
stopped:
        sky2_write32(hw, Q_ADDR(rxq, Q_CSR), BMU_RST_SET | BMU_FIFO_RST);

        /* reset the Rx prefetch unit */
        sky2_write32(hw, Y2_QADDR(rxq, PREF_UNIT_CTRL), PREF_UNIT_RST_SET);
        mmiowb();
}

/* Clean out receive buffer area, assumes receiver hardware stopped */
static void sky2_rx_clean(struct sky2_port *sky2)
{
        unsigned i;

        memset(sky2->rx_le, 0, RX_LE_BYTES);
        for (i = 0; i < sky2->rx_pending; i++) {
                struct rx_ring_info *re = sky2->rx_ring + i;

                if (re->skb) {
                        sky2_rx_unmap_skb(sky2->hw->pdev, re);
                        kfree_skb(re->skb);
                        re->skb = NULL;
                }
        }
}

/* Basic MII support */
static int sky2_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
        struct mii_ioctl_data *data = if_mii(ifr);
        struct sky2_port *sky2 = netdev_priv(dev);
        struct sky2_hw *hw = sky2->hw;
        int err = -EOPNOTSUPP;

        if (!netif_running(dev))
                return -ENODEV; /* Phy still in reset */

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

                /* fallthru */
        case SIOCGMIIREG: {
                u16 val = 0;

                spin_lock_bh(&sky2->phy_lock);
                err = __gm_phy_read(hw, sky2->port, data->reg_num & 0x1f, &val);
                spin_unlock_bh(&sky2->phy_lock);

                data->val_out = val;
                break;
        }

        case SIOCSMIIREG:
                spin_lock_bh(&sky2->phy_lock);
                err = gm_phy_write(hw, sky2->port, data->reg_num & 0x1f,
                                   data->val_in);
                spin_unlock_bh(&sky2->phy_lock);
                break;
        }
        return err;
}

#ifdef SKY2_VLAN_TAG_USED
static void sky2_set_vlan_mode(struct sky2_hw *hw, u16 port, bool onoff)
{
        if (onoff) {
                sky2_write32(hw, SK_REG(port, RX_GMF_CTRL_T),
                             RX_VLAN_STRIP_ON);
                sky2_write32(hw, SK_REG(port, TX_GMF_CTRL_T),
                             TX_VLAN_TAG_ON);
        } else {
                sky2_write32(hw, SK_REG(port, RX_GMF_CTRL_T),
                             RX_VLAN_STRIP_OFF);
                sky2_write32(hw, SK_REG(port, TX_GMF_CTRL_T),
                             TX_VLAN_TAG_OFF);
        }
}

static void sky2_vlan_rx_register(struct net_device *dev, struct vlan_group *grp)
{
        struct sky2_port *sky2 = netdev_priv(dev);
        struct sky2_hw *hw = sky2->hw;
        u16 port = sky2->port;

        netif_tx_lock_bh(dev);
        napi_disable(&hw->napi);

        sky2->vlgrp = grp;
        sky2_set_vlan_mode(hw, port, grp != NULL);

        sky2_read32(hw, B0_Y2_SP_LISR);
        napi_enable(&hw->napi);
        netif_tx_unlock_bh(dev);
}
#endif

/* Amount of required worst case padding in rx buffer */
static inline unsigned sky2_rx_pad(const struct sky2_hw *hw)
{
        return (hw->flags & SKY2_HW_RAM_BUFFER) ? 8 : 2;
}

/*
 * Allocate an skb for receiving. If the MTU is large enough
 * make the skb non-linear with a fragment list of pages.
 */
static struct sk_buff *sky2_rx_alloc(struct sky2_port *sky2)
{
        struct sk_buff *skb;
        int i;

        skb = netdev_alloc_skb(sky2->netdev,
                               sky2->rx_data_size + sky2_rx_pad(sky2->hw));
        if (!skb)
                goto nomem;

        if (sky2->hw->flags & SKY2_HW_RAM_BUFFER) {
                unsigned char *start;
                /*
                 * Workaround for a bug in FIFO that cause hang
                 * if the FIFO if the receive buffer is not 64 byte aligned.
                 * The buffer returned from netdev_alloc_skb is
                 * aligned except if slab debugging is enabled.
                 */
                start = PTR_ALIGN(skb->data, 8);
                skb_reserve(skb, start - skb->data);
        } else
                skb_reserve(skb, NET_IP_ALIGN);

        for (i = 0; i < sky2->rx_nfrags; i++) {
                struct page *page = alloc_page(GFP_ATOMIC);

                if (!page)
                        goto free_partial;
                skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
        }

        return skb;
free_partial:
        kfree_skb(skb);
nomem:
        return NULL;
}

static inline void sky2_rx_update(struct sky2_port *sky2, unsigned rxq)
{
        sky2_put_idx(sky2->hw, rxq, sky2->rx_put);
}

static int sky2_alloc_rx_skbs(struct sky2_port *sky2)
{
        struct sky2_hw *hw = sky2->hw;
        unsigned i;

        sky2->rx_data_size = sky2_get_rx_data_size(sky2);

        /* Fill Rx ring */
        for (i = 0; i < sky2->rx_pending; i++) {
                struct rx_ring_info *re = sky2->rx_ring + i;

                re->skb = sky2_rx_alloc(sky2);
                if (!re->skb)
                        return -ENOMEM;

                if (sky2_rx_map_skb(hw->pdev, re, sky2->rx_data_size)) {
                        dev_kfree_skb(re->skb);
                        re->skb = NULL;
                        return -ENOMEM;
                }
        }
        return 0;
}

/*
 * Setup receiver buffer pool.
 * Normal case this ends up creating one list element for skb
 * in the receive ring. Worst case if using large MTU and each
 * allocation falls on a different 64 bit region, that results
 * in 6 list elements per ring entry.
 * One element is used for checksum enable/disable, and one
 * extra to avoid wrap.
 */
static void sky2_rx_start(struct sky2_port *sky2)
{
        struct sky2_hw *hw = sky2->hw;
        struct rx_ring_info *re;
        unsigned rxq = rxqaddr[sky2->port];
        unsigned i, thresh;

        sky2->rx_put = sky2->rx_next = 0;
        sky2_qset(hw, rxq);

        /* On PCI express lowering the watermark gives better performance */
        if (pci_find_capability(hw->pdev, PCI_CAP_ID_EXP))
                sky2_write32(hw, Q_ADDR(rxq, Q_WM), BMU_WM_PEX);

        /* These chips have no ram buffer?
         * MAC Rx RAM Read is controlled by hardware */
        if (hw->chip_id == CHIP_ID_YUKON_EC_U &&
            (hw->chip_rev == CHIP_REV_YU_EC_U_A1 ||
             hw->chip_rev == CHIP_REV_YU_EC_U_B0))
                sky2_write32(hw, Q_ADDR(rxq, Q_TEST), F_M_RX_RAM_DIS);

        sky2_prefetch_init(hw, rxq, sky2->rx_le_map, RX_LE_SIZE - 1);

        if (!(hw->flags & SKY2_HW_NEW_LE))
                rx_set_checksum(sky2);

        /* submit Rx ring */
        for (i = 0; i < sky2->rx_pending; i++) {
                re = sky2->rx_ring + i;
                sky2_rx_submit(sky2, re);
        }

        /*
         * The receiver hangs if it receives frames larger than the
         * packet buffer. As a workaround, truncate oversize frames, but
         * the register is limited to 9 bits, so if you do frames > 2052
         * you better get the MTU right!
         */
        thresh = sky2_get_rx_threshold(sky2);
        if (thresh > 0x1ff)
                sky2_write32(hw, SK_REG(sky2->port, RX_GMF_CTRL_T), RX_TRUNC_OFF);
        else {
                sky2_write16(hw, SK_REG(sky2->port, RX_GMF_TR_THR), thresh);
                sky2_write32(hw, SK_REG(sky2->port, RX_GMF_CTRL_T), RX_TRUNC_ON);
        }

        /* Tell chip about available buffers */
        sky2_rx_update(sky2, rxq);

        if (hw->chip_id == CHIP_ID_YUKON_EX ||
            hw->chip_id == CHIP_ID_YUKON_SUPR) {
                /*
                 * Disable flushing of non ASF packets;
                 * must be done after initializing the BMUs;
                 * drivers without ASF support should do this too, otherwise
                 * it may happen that they cannot run on ASF devices;
                 * remember that the MAC FIFO isn't reset during initialization.
                 */
                sky2_write32(hw, SK_REG(sky2->port, RX_GMF_CTRL_T), RX_MACSEC_FLUSH_OFF);
        }

        if (hw->chip_id >= CHIP_ID_YUKON_SUPR) {
                /* Enable RX Home Address & Routing Header checksum fix */
                sky2_write16(hw, SK_REG(sky2->port, RX_GMF_FL_CTRL),
                             RX_IPV6_SA_MOB_ENA | RX_IPV6_DA_MOB_ENA);

                /* Enable TX Home Address & Routing Header checksum fix */
                sky2_write32(hw, Q_ADDR(txqaddr[sky2->port], Q_TEST),
                             TBMU_TEST_HOME_ADD_FIX_EN | TBMU_TEST_ROUTING_ADD_FIX_EN);
        }
}

static int sky2_alloc_buffers(struct sky2_port *sky2)
{
        struct sky2_hw *hw = sky2->hw;

        /* must be power of 2 */
        sky2->tx_le = pci_alloc_consistent(hw->pdev,
                                           sky2->tx_ring_size *
                                           sizeof(struct sky2_tx_le),
                                           &sky2->tx_le_map);
        if (!sky2->tx_le)
                goto nomem;

        sky2->tx_ring = kcalloc(sky2->tx_ring_size, sizeof(struct tx_ring_info),
                                GFP_KERNEL);
        if (!sky2->tx_ring)
                goto nomem;

        sky2->rx_le = pci_alloc_consistent(hw->pdev, RX_LE_BYTES,
                                           &sky2->rx_le_map);
        if (!sky2->rx_le)
                goto nomem;
        memset(sky2->rx_le, 0, RX_LE_BYTES);

        sky2->rx_ring = kcalloc(sky2->rx_pending, sizeof(struct rx_ring_info),
                                GFP_KERNEL);
        if (!sky2->rx_ring)
                goto nomem;

        return sky2_alloc_rx_skbs(sky2);
nomem:
        return -ENOMEM;
}

static void sky2_free_buffers(struct sky2_port *sky2)
{
        struct sky2_hw *hw = sky2->hw;

        sky2_rx_clean(sky2);

        if (sky2->rx_le) {
                pci_free_consistent(hw->pdev, RX_LE_BYTES,
                                    sky2->rx_le, sky2->rx_le_map);
                sky2->rx_le = NULL;
        }
        if (sky2->tx_le) {
                pci_free_consistent(hw->pdev,
                                    sky2->tx_ring_size * sizeof(struct sky2_tx_le),
                                    sky2->tx_le, sky2->tx_le_map);
                sky2->tx_le = NULL;
        }
        kfree(sky2->tx_ring);
        kfree(sky2->rx_ring);

        sky2->tx_ring = NULL;
        sky2->rx_ring = NULL;
}

static void sky2_hw_up(struct sky2_port *sky2)
{
        struct sky2_hw *hw = sky2->hw;
        unsigned port = sky2->port;
        u32 ramsize;
        int cap;
        struct net_device *otherdev = hw->dev[sky2->port^1];

        tx_init(sky2);

        /*
         * On dual port PCI-X card, there is an problem where status
         * can be received out of order due to split transactions
         */
        if (otherdev && netif_running(otherdev) &&
            (cap = pci_find_capability(hw->pdev, PCI_CAP_ID_PCIX))) {
                u16 cmd;

                cmd = sky2_pci_read16(hw, cap + PCI_X_CMD);
                cmd &= ~PCI_X_CMD_MAX_SPLIT;
                sky2_pci_write16(hw, cap + PCI_X_CMD, cmd);
        }

        sky2_mac_init(hw, port);

        /* Register is number of 4K blocks on internal RAM buffer. */
        ramsize = sky2_read8(hw, B2_E_0) * 4;
        if (ramsize > 0) {
                u32 rxspace;

                pr_debug(PFX "%s: ram buffer %dK\n", sky2->netdev->name, ramsize);
                if (ramsize < 16)
                        rxspace = ramsize / 2;
                else
                        rxspace = 8 + (2*(ramsize - 16))/3;

                sky2_ramset(hw, rxqaddr[port], 0, rxspace);
                sky2_ramset(hw, txqaddr[port], rxspace, ramsize - rxspace);

                /* Make sure SyncQ is disabled */
                sky2_write8(hw, RB_ADDR(port == 0 ? Q_XS1 : Q_XS2, RB_CTRL),
                            RB_RST_SET);
        }

        sky2_qset(hw, txqaddr[port]);

        /* This is copied from sk98lin 10.0.5.3; no one tells me about erratta's */
        if (hw->chip_id == CHIP_ID_YUKON_EX && hw->chip_rev == CHIP_REV_YU_EX_B0)
                sky2_write32(hw, Q_ADDR(txqaddr[port], Q_TEST), F_TX_CHK_AUTO_OFF);

        /* Set almost empty threshold */
        if (hw->chip_id == CHIP_ID_YUKON_EC_U &&
            hw->chip_rev == CHIP_REV_YU_EC_U_A0)
                sky2_write16(hw, Q_ADDR(txqaddr[port], Q_AL), ECU_TXFF_LEV);

        sky2_prefetch_init(hw, txqaddr[port], sky2->tx_le_map,
                           sky2->tx_ring_size - 1);

#ifdef SKY2_VLAN_TAG_USED
        sky2_set_vlan_mode(hw, port, sky2->vlgrp != NULL);
#endif

        sky2_rx_start(sky2);
}

/* Bring up network interface. */
static int sky2_up(struct net_device *dev)
{
        struct sky2_port *sky2 = netdev_priv(dev);
        struct sky2_hw *hw = sky2->hw;
        unsigned port = sky2->port;
        u32 imask;
        int err;

        netif_carrier_off(dev);

        err = sky2_alloc_buffers(sky2);
        if (err)
                goto err_out;

        sky2_hw_up(sky2);

        /* Enable interrupts from phy/mac for port */
        imask = sky2_read32(hw, B0_IMSK);
        imask |= portirq_msk[port];
        sky2_write32(hw, B0_IMSK, imask);
        sky2_read32(hw, B0_IMSK);

        if (netif_msg_ifup(sky2))
                printk(KERN_INFO PFX "%s: enabling interface\n", dev->name);

        return 0;

err_out:
        sky2_free_buffers(sky2);
        return err;
}

/* Modular subtraction in ring */
static inline int tx_inuse(const struct sky2_port *sky2)
{
        return (sky2->tx_prod - sky2->tx_cons) & (sky2->tx_ring_size - 1);
}

/* Number of list elements available for next tx */
static inline int tx_avail(const struct sky2_port *sky2)
{
        return sky2->tx_pending - tx_inuse(sky2);
}

/* Estimate of number of transmit list elements required */
static unsigned tx_le_req(const struct sk_buff *skb)
{
        unsigned count;

        count = (skb_shinfo(skb)->nr_frags + 1)
                * (sizeof(dma_addr_t) / sizeof(u32));

        if (skb_is_gso(skb))
                ++count;
        else if (sizeof(dma_addr_t) == sizeof(u32))
                ++count;        /* possible vlan */

        if (skb->ip_summed == CHECKSUM_PARTIAL)
                ++count;

        return count;
}

static void sky2_tx_unmap(struct pci_dev *pdev, struct tx_ring_info *re)
{
        if (re->flags & TX_MAP_SINGLE)
                pci_unmap_single(pdev, pci_unmap_addr(re, mapaddr),
                                 pci_unmap_len(re, maplen),
                                 PCI_DMA_TODEVICE);
        else if (re->flags & TX_MAP_PAGE)
                pci_unmap_page(pdev, pci_unmap_addr(re, mapaddr),
                               pci_unmap_len(re, maplen),
                               PCI_DMA_TODEVICE);
        re->flags = 0;
}

/*
 * Put one packet in ring for transmit.
 * A single packet can generate multiple list elements, and
 * the number of ring elements will probably be less than the number
 * of list elements used.
 */
static netdev_tx_t sky2_xmit_frame(struct sk_buff *skb,
                                   struct net_device *dev)
{
        struct sky2_port *sky2 = netdev_priv(dev);
        struct sky2_hw *hw = sky2->hw;
        struct sky2_tx_le *le = NULL;
        struct tx_ring_info *re;
        unsigned i, len;
        dma_addr_t mapping;
        u32 upper;
        u16 slot;
        u16 mss;
        u8 ctrl;

        if (unlikely(tx_avail(sky2) < tx_le_req(skb)))
                return NETDEV_TX_BUSY;

        len = skb_headlen(skb);
        mapping = pci_map_single(hw->pdev, skb->data, len, PCI_DMA_TODEVICE);

        if (pci_dma_mapping_error(hw->pdev, mapping))
                goto mapping_error;

        slot = sky2->tx_prod;
        if (unlikely(netif_msg_tx_queued(sky2)))
                printk(KERN_DEBUG "%s: tx queued, slot %u, len %d\n",
                       dev->name, slot, skb->len);

        /* Send high bits if needed */
        upper = upper_32_bits(mapping);
        if (upper != sky2->tx_last_upper) {
                le = get_tx_le(sky2, &slot);
                le->addr = cpu_to_le32(upper);
                sky2->tx_last_upper = upper;
                le->opcode = OP_ADDR64 | HW_OWNER;
        }

        /* Check for TCP Segmentation Offload */
        mss = skb_shinfo(skb)->gso_size;
        if (mss != 0) {

                if (!(hw->flags & SKY2_HW_NEW_LE))
                        mss += ETH_HLEN + ip_hdrlen(skb) + tcp_hdrlen(skb);

                if (mss != sky2->tx_last_mss) {
                        le = get_tx_le(sky2, &slot);
                        le->addr = cpu_to_le32(mss);

                        if (hw->flags & SKY2_HW_NEW_LE)
                                le->opcode = OP_MSS | HW_OWNER;
                        else
                                le->opcode = OP_LRGLEN | HW_OWNER;
                        sky2->tx_last_mss = mss;
                }
        }

        ctrl = 0;
#ifdef SKY2_VLAN_TAG_USED
        /* Add VLAN tag, can piggyback on LRGLEN or ADDR64 */
        if (sky2->vlgrp && vlan_tx_tag_present(skb)) {
                if (!le) {
                        le = get_tx_le(sky2, &slot);
                        le->addr = 0;
                        le->opcode = OP_VLAN|HW_OWNER;
                } else
                        le->opcode |= OP_VLAN;
                le->length = cpu_to_be16(vlan_tx_tag_get(skb));
                ctrl |= INS_VLAN;
        }
#endif

        /* Handle TCP checksum offload */
        if (skb->ip_summed == CHECKSUM_PARTIAL) {
                /* On Yukon EX (some versions) encoding change. */
                if (hw->flags & SKY2_HW_AUTO_TX_SUM)
                        ctrl |= CALSUM; /* auto checksum */
                else {
                        const unsigned offset = skb_transport_offset(skb);
                        u32 tcpsum;

                        tcpsum = offset << 16;                  /* sum start */
                        tcpsum |= offset + skb->csum_offset;    /* sum write */

                        ctrl |= CALSUM | WR_SUM | INIT_SUM | LOCK_SUM;
                        if (ip_hdr(skb)->protocol == IPPROTO_UDP)
                                ctrl |= UDPTCP;

                        if (tcpsum != sky2->tx_tcpsum) {
                                sky2->tx_tcpsum = tcpsum;

                                le = get_tx_le(sky2, &slot);
                                le->addr = cpu_to_le32(tcpsum);
                                le->length = 0; /* initial checksum value */
                                le->ctrl = 1;   /* one packet */
                                le->opcode = OP_TCPLISW | HW_OWNER;
                        }
                }
        }

        re = sky2->tx_ring + slot;
        re->flags = TX_MAP_SINGLE;
        pci_unmap_addr_set(re, mapaddr, mapping);
        pci_unmap_len_set(re, maplen, len);

        le = get_tx_le(sky2, &slot);
        le->addr = cpu_to_le32(lower_32_bits(mapping));
        le->length = cpu_to_le16(len);
        le->ctrl = ctrl;
        le->opcode = mss ? (OP_LARGESEND | HW_OWNER) : (OP_PACKET | HW_OWNER);


        for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
                const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];

                mapping = pci_map_page(hw->pdev, frag->page, frag->page_offset,
                                       frag->size, PCI_DMA_TODEVICE);

                if (pci_dma_mapping_error(hw->pdev, mapping))
                        goto mapping_unwind;

                upper = upper_32_bits(mapping);
                if (upper != sky2->tx_last_upper) {
                        le = get_tx_le(sky2, &slot);
                        le->addr = cpu_to_le32(upper);
                        sky2->tx_last_upper = upper;
                        le->opcode = OP_ADDR64 | HW_OWNER;
                }

                re = sky2->tx_ring + slot;
                re->flags = TX_MAP_PAGE;
                pci_unmap_addr_set(re, mapaddr, mapping);
                pci_unmap_len_set(re, maplen, frag->size);

                le = get_tx_le(sky2, &slot);
                le->addr = cpu_to_le32(lower_32_bits(mapping));
                le->length = cpu_to_le16(frag->size);
                le->ctrl = ctrl;
                le->opcode = OP_BUFFER | HW_OWNER;
        }

        re->skb = skb;
        le->ctrl |= EOP;

        sky2->tx_prod = slot;

        if (tx_avail(sky2) <= MAX_SKB_TX_LE)
                netif_stop_queue(dev);

        sky2_put_idx(hw, txqaddr[sky2->port], sky2->tx_prod);

        return NETDEV_TX_OK;

mapping_unwind:
        for (i = sky2->tx_prod; i != slot; i = RING_NEXT(i, sky2->tx_ring_size)) {
                re = sky2->tx_ring + i;

                sky2_tx_unmap(hw->pdev, re);
        }

mapping_error:
        if (net_ratelimit())
                dev_warn(&hw->pdev->dev, "%s: tx mapping error\n", dev->name);
        dev_kfree_skb(skb);
        return NETDEV_TX_OK;
}

/*
 * Free ring elements from starting at tx_cons until "done"
 *
 * NB:
 *  1. The hardware will tell us about partial completion of multi-part
 *     buffers so make sure not to free skb to early.
 *  2. This may run in parallel start_xmit because the it only
 *     looks at the tail of the queue of FIFO (tx_cons), not
 *     the head (tx_prod)
 */
static void sky2_tx_complete(struct sky2_port *sky2, u16 done)
{
        struct net_device *dev = sky2->netdev;
        unsigned idx;

        BUG_ON(done >= sky2->tx_ring_size);

        for (idx = sky2->tx_cons; idx != done;
             idx = RING_NEXT(idx, sky2->tx_ring_size)) {
                struct tx_ring_info *re = sky2->tx_ring + idx;
                struct sk_buff *skb = re->skb;

                sky2_tx_unmap(sky2->hw->pdev, re);

                if (skb) {
                        if (unlikely(netif_msg_tx_done(sky2)))
                                printk(KERN_DEBUG "%s: tx done %u\n",
                                       dev->name, idx);

                        dev->stats.tx_packets++;
                        dev->stats.tx_bytes += skb->len;

                        re->skb = NULL;
                        dev_kfree_skb_any(skb);

                        sky2->tx_next = RING_NEXT(idx, sky2->tx_ring_size);
                }
        }

        sky2->tx_cons = idx;
        smp_mb();
}

static void sky2_tx_reset(struct sky2_hw *hw, unsigned port)
{
        /* Disable Force Sync bit and Enable Alloc bit */
        sky2_write8(hw, SK_REG(port, TXA_CTRL),
                    TXA_DIS_FSYNC | TXA_DIS_ALLOC | TXA_STOP_RC);

        /* Stop Interval Timer and Limit Counter of Tx Arbiter */
        sky2_write32(hw, SK_REG(port, TXA_ITI_INI), 0L);
        sky2_write32(hw, SK_REG(port, TXA_LIM_INI), 0L);

        /* Reset the PCI FIFO of the async Tx queue */
        sky2_write32(hw, Q_ADDR(txqaddr[port], Q_CSR),
                     BMU_RST_SET | BMU_FIFO_RST);

        /* Reset the Tx prefetch units */
        sky2_write32(hw, Y2_QADDR(txqaddr[port], PREF_UNIT_CTRL),
                     PREF_UNIT_RST_SET);

        sky2_write32(hw, RB_ADDR(txqaddr[port], RB_CTRL), RB_RST_SET);
        sky2_write8(hw, SK_REG(port, TX_GMF_CTRL_T), GMF_RST_SET);
}

static void sky2_hw_down(struct sky2_port *sky2)
{
        struct sky2_hw *hw = sky2->hw;
        unsigned port = sky2->port;
        u16 ctrl;

        /* Force flow control off */
        sky2_write8(hw, SK_REG(port, GMAC_CTRL), GMC_PAUSE_OFF);

        /* Stop transmitter */
        sky2_write32(hw, Q_ADDR(txqaddr[port], Q_CSR), BMU_STOP);
        sky2_read32(hw, Q_ADDR(txqaddr[port], Q_CSR));

        sky2_write32(hw, RB_ADDR(txqaddr[port], RB_CTRL),
                     RB_RST_SET | RB_DIS_OP_MD);

        ctrl = gma_read16(hw, port, GM_GP_CTRL);
        ctrl &= ~(GM_GPCR_TX_ENA | GM_GPCR_RX_ENA);
        gma_write16(hw, port, GM_GP_CTRL, ctrl);

        sky2_write8(hw, SK_REG(port, GPHY_CTRL), GPC_RST_SET);

        /* Workaround shared GMAC reset */
        if (!(hw->chip_id == CHIP_ID_YUKON_XL && hw->chip_rev == 0 &&
              port == 0 && hw->dev[1] && netif_running(hw->dev[1])))
                sky2_write8(hw, SK_REG(port, GMAC_CTRL), GMC_RST_SET);

        sky2_write8(hw, SK_REG(port, RX_GMF_CTRL_T), GMF_RST_SET);

        /* Force any delayed status interrrupt and NAPI */
        sky2_write32(hw, STAT_LEV_TIMER_CNT, 0);
        sky2_write32(hw, STAT_TX_TIMER_CNT, 0);
        sky2_write32(hw, STAT_ISR_TIMER_CNT, 0);
        sky2_read8(hw, STAT_ISR_TIMER_CTRL);

        sky2_rx_stop(sky2);

        spin_lock_bh(&sky2->phy_lock);
        sky2_phy_power_down(hw, port);
        spin_unlock_bh(&sky2->phy_lock);

        sky2_tx_reset(hw, port);

        /* Free any pending frames stuck in HW queue */
        sky2_tx_complete(sky2, sky2->tx_prod);
}

/* Network shutdown */
static int sky2_down(struct net_device *dev)
{
        struct sky2_port *sky2 = netdev_priv(dev);
        struct sky2_hw *hw = sky2->hw;

        /* Never really got started! */
        if (!sky2->tx_le)
                return 0;

        if (netif_msg_ifdown(sky2))
                printk(KERN_INFO PFX "%s: disabling interface\n", dev->name);

        /* Disable port IRQ */
        sky2_write32(hw, B0_IMSK,
                     sky2_read32(hw, B0_IMSK) & ~portirq_msk[sky2->port]);
        sky2_read32(hw, B0_IMSK);

        synchronize_irq(hw->pdev->irq);
        napi_synchronize(&hw->napi);

        sky2_hw_down(sky2);

        sky2_free_buffers(sky2);

        return 0;
}

static u16 sky2_phy_speed(const struct sky2_hw *hw, u16 aux)
{
        if (hw->flags & SKY2_HW_FIBRE_PHY)
                return SPEED_1000;

        if (!(hw->flags & SKY2_HW_GIGABIT)) {
                if (aux & PHY_M_PS_SPEED_100)
                        return SPEED_100;
                else
                        return SPEED_10;
        }

        switch (aux & PHY_M_PS_SPEED_MSK) {
        case PHY_M_PS_SPEED_1000:
                return SPEED_1000;
        case PHY_M_PS_SPEED_100:
                return SPEED_100;
        default:
                return SPEED_10;
        }
}

static void sky2_link_up(struct sky2_port *sky2)
{
        struct sky2_hw *hw = sky2->hw;
        unsigned port = sky2->port;
        u16 reg;
        static const char *fc_name[] = {
                [FC_NONE]       = "none",
                [FC_TX]         = "tx",
                [FC_RX]         = "rx",
                [FC_BOTH]       = "both",
        };

        /* enable Rx/Tx */
        reg = gma_read16(hw, port, GM_GP_CTRL);
        reg |= GM_GPCR_RX_ENA | GM_GPCR_TX_ENA;
        gma_write16(hw, port, GM_GP_CTRL, reg);

        gm_phy_write(hw, port, PHY_MARV_INT_MASK, PHY_M_DEF_MSK);

        netif_carrier_on(sky2->netdev);

        mod_timer(&hw->watchdog_timer, jiffies + 1);

        /* Turn on link LED */
        sky2_write8(hw, SK_REG(port, LNK_LED_REG),
                    LINKLED_ON | LINKLED_BLINK_OFF | LINKLED_LINKSYNC_OFF);

        if (netif_msg_link(sky2))
                printk(KERN_INFO PFX
                       "%s: Link is up at %d Mbps, %s duplex, flow control %s\n",
                       sky2->netdev->name, sky2->speed,
                       sky2->duplex == DUPLEX_FULL ? "full" : "half",
                       fc_name[sky2->flow_status]);
}

static void sky2_link_down(struct sky2_port *sky2)
{
        struct sky2_hw *hw = sky2->hw;
        unsigned port = sky2->port;
        u16 reg;

        gm_phy_write(hw, port, PHY_MARV_INT_MASK, 0);

        reg = gma_read16(hw, port, GM_GP_CTRL);
        reg &= ~(GM_GPCR_RX_ENA | GM_GPCR_TX_ENA);
        gma_write16(hw, port, GM_GP_CTRL, reg);

        netif_carrier_off(sky2->netdev);

        /* Turn off link LED */
        sky2_write8(hw, SK_REG(port, LNK_LED_REG), LINKLED_OFF);

        if (netif_msg_link(sky2))
                printk(KERN_INFO PFX "%s: Link is down.\n", sky2->netdev->name);

        sky2_phy_init(hw, port);
}

static enum flow_control sky2_flow(int rx, int tx)
{
        if (rx)
                return tx ? FC_BOTH : FC_RX;
        else
                return tx ? FC_TX : FC_NONE;
}

static int sky2_autoneg_done(struct sky2_port *sky2, u16 aux)
{
        struct sky2_hw *hw = sky2->hw;
        unsigned port = sky2->port;
        u16 advert, lpa;

        advert = gm_phy_read(hw, port, PHY_MARV_AUNE_ADV);
        lpa = gm_phy_read(hw, port, PHY_MARV_AUNE_LP);
        if (lpa & PHY_M_AN_RF) {
                printk(KERN_ERR PFX "%s: remote fault", sky2->netdev->name);
                return -1;
        }

        if (!(aux & PHY_M_PS_SPDUP_RES)) {
                printk(KERN_ERR PFX "%s: speed/duplex mismatch",
                       sky2->netdev->name);
                return -1;
        }

        sky2->speed = sky2_phy_speed(hw, aux);
        sky2->duplex = (aux & PHY_M_PS_FULL_DUP) ? DUPLEX_FULL : DUPLEX_HALF;

        /* Since the pause result bits seem to in different positions on
         * different chips. look at registers.
         */
        if (hw->flags & SKY2_HW_FIBRE_PHY) {
                /* Shift for bits in fiber PHY */
                advert &= ~(ADVERTISE_PAUSE_CAP|ADVERTISE_PAUSE_ASYM);
                lpa &= ~(LPA_PAUSE_CAP|LPA_PAUSE_ASYM);

                if (advert & ADVERTISE_1000XPAUSE)
                        advert |= ADVERTISE_PAUSE_CAP;
                if (advert & ADVERTISE_1000XPSE_ASYM)
                        advert |= ADVERTISE_PAUSE_ASYM;
                if (lpa & LPA_1000XPAUSE)
                        lpa |= LPA_PAUSE_CAP;
                if (lpa & LPA_1000XPAUSE_ASYM)
                        lpa |= LPA_PAUSE_ASYM;
        }

        sky2->flow_status = FC_NONE;
        if (advert & ADVERTISE_PAUSE_CAP) {
                if (lpa & LPA_PAUSE_CAP)
                        sky2->flow_status = FC_BOTH;
                else if (advert & ADVERTISE_PAUSE_ASYM)
                        sky2->flow_status = FC_RX;
        } else if (advert & ADVERTISE_PAUSE_ASYM) {
                if ((lpa & LPA_PAUSE_CAP) && (lpa & LPA_PAUSE_ASYM))
                        sky2->flow_status = FC_TX;
        }

        if (sky2->duplex == DUPLEX_HALF && sky2->speed < SPEED_1000 &&
            !(hw->chip_id == CHIP_ID_YUKON_EC_U || hw->chip_id == CHIP_ID_YUKON_EX))
                sky2->flow_status = FC_NONE;

        if (sky2->flow_status & FC_TX)
                sky2_write8(hw, SK_REG(port, GMAC_CTRL), GMC_PAUSE_ON);
        else
                sky2_write8(hw, SK_REG(port, GMAC_CTRL), GMC_PAUSE_OFF);

        return 0;
}

/* Interrupt from PHY */
static void sky2_phy_intr(struct sky2_hw *hw, unsigned port)
{
        struct net_device *dev = hw->dev[port];
        struct sky2_port *sky2 = netdev_priv(dev);
        u16 istatus, phystat;

        if (!netif_running(dev))
                return;

        spin_lock(&sky2->phy_lock);
        istatus = gm_phy_read(hw, port, PHY_MARV_INT_STAT);
        phystat = gm_phy_read(hw, port, PHY_MARV_PHY_STAT);

        if (netif_msg_intr(sky2))
                printk(KERN_INFO PFX "%s: phy interrupt status 0x%x 0x%x\n",
                       sky2->netdev->name, istatus, phystat);

        if (istatus & PHY_M_IS_AN_COMPL) {
                if (sky2_autoneg_done(sky2, phystat) == 0)
                        sky2_link_up(sky2);
                goto out;
        }

        if (istatus & PHY_M_IS_LSP_CHANGE)
                sky2->speed = sky2_phy_speed(hw, phystat);

        if (istatus & PHY_M_IS_DUP_CHANGE)
                sky2->duplex =
                    (phystat & PHY_M_PS_FULL_DUP) ? DUPLEX_FULL : DUPLEX_HALF;

        if (istatus & PHY_M_IS_LST_CHANGE) {
                if (phystat & PHY_M_PS_LINK_UP)
                        sky2_link_up(sky2);
                else
                        sky2_link_down(sky2);
        }
out:
        spin_unlock(&sky2->phy_lock);
}

/* Special quick link interrupt (Yukon-2 Optima only) */
static void sky2_qlink_intr(struct sky2_hw *hw)
{
        struct sky2_port *sky2 = netdev_priv(hw->dev[0]);
        u32 imask;
        u16 phy;

        /* disable irq */
        imask = sky2_read32(hw, B0_IMSK);
        imask &= ~Y2_IS_PHY_QLNK;
        sky2_write32(hw, B0_IMSK, imask);

        /* reset PHY Link Detect */
        phy = sky2_pci_read16(hw, PSM_CONFIG_REG4);
        sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_ON);
        sky2_pci_write16(hw, PSM_CONFIG_REG4, phy | 1);
        sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_OFF);

        sky2_link_up(sky2);
}

/* Transmit timeout is only called if we are running, carrier is up
 * and tx queue is full (stopped).
 */
static void sky2_tx_timeout(struct net_device *dev)
{
        struct sky2_port *sky2 = netdev_priv(dev);
        struct sky2_hw *hw = sky2->hw;

        if (netif_msg_timer(sky2))
                printk(KERN_ERR PFX "%s: tx timeout\n", dev->name);

        printk(KERN_DEBUG PFX "%s: transmit ring %u .. %u report=%u done=%u\n",
               dev->name, sky2->tx_cons, sky2->tx_prod,
               sky2_read16(hw, sky2->port == 0 ? STAT_TXA1_RIDX : STAT_TXA2_RIDX),
               sky2_read16(hw, Q_ADDR(txqaddr[sky2->port], Q_DONE)));

        /* can't restart safely under softirq */
        schedule_work(&hw->restart_work);
}

static int sky2_change_mtu(struct net_device *dev, int new_mtu)
{
        struct sky2_port *sky2 = netdev_priv(dev);
        struct sky2_hw *hw = sky2->hw;
        unsigned port = sky2->port;
        int err;
        u16 ctl, mode;
        u32 imask;

        /* MTU size outside the spec */
        if (new_mtu < ETH_ZLEN || new_mtu > ETH_JUMBO_MTU)
                return -EINVAL;

        /* MTU > 1500 on yukon FE and FE+ not allowed */
        if (new_mtu > ETH_DATA_LEN &&
            (hw->chip_id == CHIP_ID_YUKON_FE ||
             hw->chip_id == CHIP_ID_YUKON_FE_P))
                return -EINVAL;

        /* TSO, etc on Yukon Ultra and MTU > 1500 not supported */
        if (new_mtu > ETH_DATA_LEN && hw->chip_id == CHIP_ID_YUKON_EC_U)
                dev->features &= ~(NETIF_F_TSO|NETIF_F_SG|NETIF_F_ALL_CSUM);

        if (!netif_running(dev)) {
                dev->mtu = new_mtu;
                return 0;
        }

        imask = sky2_read32(hw, B0_IMSK);
        sky2_write32(hw, B0_IMSK, 0);

        dev->trans_start = jiffies;     /* prevent tx timeout */
        netif_stop_queue(dev);
        napi_disable(&hw->napi);

        synchronize_irq(hw->pdev->irq);

        if (!(hw->flags & SKY2_HW_RAM_BUFFER))
                sky2_set_tx_stfwd(hw, port);

        ctl = gma_read16(hw, port, GM_GP_CTRL);
        gma_write16(hw, port, GM_GP_CTRL, ctl & ~GM_GPCR_RX_ENA);
        sky2_rx_stop(sky2);
        sky2_rx_clean(sky2);

        dev->mtu = new_mtu;

        mode = DATA_BLIND_VAL(DATA_BLIND_DEF) |
                GM_SMOD_VLAN_ENA | IPG_DATA_VAL(IPG_DATA_DEF);

        if (dev->mtu > ETH_DATA_LEN)
                mode |= GM_SMOD_JUMBO_ENA;

        gma_write16(hw, port, GM_SERIAL_MODE, mode);

        sky2_write8(hw, RB_ADDR(rxqaddr[port], RB_CTRL), RB_ENA_OP_MD);

        err = sky2_alloc_rx_skbs(sky2);
        if (!err)
                sky2_rx_start(sky2);
        else
                sky2_rx_clean(sky2);
        sky2_write32(hw, B0_IMSK, imask);

        sky2_read32(hw, B0_Y2_SP_LISR);
        napi_enable(&hw->napi);

        if (err)
                dev_close(dev);
        else {
                gma_write16(hw, port, GM_GP_CTRL, ctl);

                netif_wake_queue(dev);
        }

        return err;
}

/* For small just reuse existing skb for next receive */
static struct sk_buff *receive_copy(struct sky2_port *sky2,
                                    const struct rx_ring_info *re,
                                    unsigned length)
{
        struct sk_buff *skb;

        skb = netdev_alloc_skb_ip_align(sky2->netdev, length);
        if (likely(skb)) {
                pci_dma_sync_single_for_cpu(sky2->hw->pdev, re->data_addr,
                                            length, PCI_DMA_FROMDEVICE);
                skb_copy_from_linear_data(re->skb, skb->data, length);
                skb->ip_summed = re->skb->ip_summed;
                skb->csum = re->skb->csum;
                pci_dma_sync_single_for_device(sky2->hw->pdev, re->data_addr,
                                               length, PCI_DMA_FROMDEVICE);
                re->skb->ip_summed = CHECKSUM_NONE;
                skb_put(skb, length);
        }
        return skb;
}

/* Adjust length of skb with fragments to match received data */
static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
                          unsigned int length)
{
        int i, num_frags;
        unsigned int size;

        /* put header into skb */
        size = min(length, hdr_space);
        skb->tail += size;
        skb->len += size;
        length -= size;

        num_frags = skb_shinfo(skb)->nr_frags;
        for (i = 0; i < num_frags; i++) {
                skb_frag_t *frag = &skb_shinfo(skb)->frags[i];

                if (length == 0) {
                        /* don't need this page */
                        __free_page(frag->page);
                        --skb_shinfo(skb)->nr_frags;
                } else {
                        size = min(length, (unsigned) PAGE_SIZE);

                        frag->size = size;
                        skb->data_len += size;
                        skb->truesize += size;
                        skb->len += size;
                        length -= size;
                }
        }
}

/* Normal packet - take skb from ring element and put in a new one  */
static struct sk_buff *receive_new(struct sky2_port *sky2,
                                   struct rx_ring_info *re,
                                   unsigned int length)
{
        struct sk_buff *skb;
        struct rx_ring_info nre;
        unsigned hdr_space = sky2->rx_data_size;

        nre.skb = sky2_rx_alloc(sky2);
        if (unlikely(!nre.skb))
                goto nobuf;

        if (sky2_rx_map_skb(sky2->hw->pdev, &nre, hdr_space))
                goto nomap;

        skb = re->skb;
        sky2_rx_unmap_skb(sky2->hw->pdev, re);
        prefetch(skb->data);
        *re = nre;

        if (skb_shinfo(skb)->nr_frags)
                skb_put_frags(skb, hdr_space, length);
        else
                skb_put(skb, length);
        return skb;

nomap:
        dev_kfree_skb(nre.skb);
nobuf:
        return NULL;
}

/*
 * Receive one packet.
 * For larger packets, get new buffer.
 */
static struct sk_buff *sky2_receive(struct net_device *dev,
                                    u16 length, u32 status)
{
        struct sky2_port *sky2 = netdev_priv(dev);
        struct rx_ring_info *re = sky2->rx_ring + sky2->rx_next;
        struct sk_buff *skb = NULL;
        u16 count = (status & GMR_FS_LEN) >> 16;

#ifdef SKY2_VLAN_TAG_USED
        /* Account for vlan tag */
        if (sky2->vlgrp && (status & GMR_FS_VLAN))
                count -= VLAN_HLEN;
#endif

        if (unlikely(netif_msg_rx_status(sky2)))
                printk(KERN_DEBUG PFX "%s: rx slot %u status 0x%x len %d\n",
                       dev->name, sky2->rx_next, status, length);

        sky2->rx_next = (sky2->rx_next + 1) % sky2->rx_pending;
        prefetch(sky2->rx_ring + sky2->rx_next);

        /* This chip has hardware problems that generates bogus status.
         * So do only marginal checking and expect higher level protocols
         * to handle crap frames.
         */
        if (sky2->hw->chip_id == CHIP_ID_YUKON_FE_P &&
            sky2->hw->chip_rev == CHIP_REV_YU_FE2_A0 &&
            length != count)
                goto okay;

        if (status & GMR_FS_ANY_ERR)
                goto error;

        if (!(status & GMR_FS_RX_OK))
                goto resubmit;

        /* if length reported by DMA does not match PHY, packet was truncated */
        if (length != count)
                goto len_error;

okay:
        if (length < copybreak)
                skb = receive_copy(sky2, re, length);
        else
                skb = receive_new(sky2, re, length);

        dev->stats.rx_dropped += (skb == NULL);

resubmit:
        sky2_rx_submit(sky2, re);

        return skb;

len_error:
        /* Truncation of overlength packets
           causes PHY length to not match MAC length */
        ++dev->stats.rx_length_errors;
        if (netif_msg_rx_err(sky2) && net_ratelimit())
                pr_info(PFX "%s: rx length error: status %#x length %d\n",
                        dev->name, status, length);
        goto resubmit;

error:
        ++dev->stats.rx_errors;
        if (status & GMR_FS_RX_FF_OV) {
                dev->stats.rx_over_errors++;
                goto resubmit;
        }

        if (netif_msg_rx_err(sky2) && net_ratelimit())
                printk(KERN_INFO PFX "%s: rx error, status 0x%x length %d\n",
                       dev->name, status, length);

        if (status & (GMR_FS_LONG_ERR | GMR_FS_UN_SIZE))
                dev->stats.rx_length_errors++;
        if (status & GMR_FS_FRAGMENT)
                dev->stats.rx_frame_errors++;
        if (status & GMR_FS_CRC_ERR)
                dev->stats.rx_crc_errors++;

        goto resubmit;
}

/* Transmit complete */
static inline void sky2_tx_done(struct net_device *dev, u16 last)
{
        struct sky2_port *sky2 = netdev_priv(dev);

        if (netif_running(dev)) {
                sky2_tx_complete(sky2, last);

                /* Wake unless it's detached, and called e.g. from sky2_down() */
                if (tx_avail(sky2) > MAX_SKB_TX_LE + 4)
                        netif_wake_queue(dev);
        }
}

static inline void sky2_skb_rx(const struct sky2_port *sky2,
                               u32 status, struct sk_buff *skb)
{
#ifdef SKY2_VLAN_TAG_USED
        u16 vlan_tag = be16_to_cpu(sky2->rx_tag);
        if (sky2->vlgrp && (status & GMR_FS_VLAN)) {
                if (skb->ip_summed == CHECKSUM_NONE)
                        vlan_hwaccel_receive_skb(skb, sky2->vlgrp, vlan_tag);
                else
                        vlan_gro_receive(&sky2->hw->napi, sky2->vlgrp,
                                         vlan_tag, skb);
                return;
        }
#endif
        if (skb->ip_summed == CHECKSUM_NONE)
                netif_receive_skb(skb);
        else
                napi_gro_receive(&sky2->hw->napi, skb);
}

static inline void sky2_rx_done(struct sky2_hw *hw, unsigned port,
                                unsigned packets, unsigned bytes)
{
        if (packets) {
                struct net_device *dev = hw->dev[port];

                dev->stats.rx_packets += packets;
                dev->stats.rx_bytes += bytes;
                dev->last_rx = jiffies;
                sky2_rx_update(netdev_priv(dev), rxqaddr[port]);
        }
}

static void sky2_rx_checksum(struct sky2_port *sky2, u32 status)
{
        /* If this happens then driver assuming wrong format for chip type */
        BUG_ON(sky2->hw->flags & SKY2_HW_NEW_LE);

        /* Both checksum counters are programmed to start at
         * the same offset, so unless there is a problem they
         * should match. This failure is an early indication that
         * hardware receive checksumming won't work.
         */
        if (likely((u16)(status >> 16) == (u16)status)) {
                struct sk_buff *skb = sky2->rx_ring[sky2->rx_next].skb;
                skb->ip_summed = CHECKSUM_COMPLETE;
                skb->csum = le16_to_cpu(status);
        } else {
                dev_notice(&sky2->hw->pdev->dev,
                           "%s: receive checksum problem (status = %#x)\n",
                           sky2->netdev->name, status);

                /* Disable checksum offload */
                sky2->flags &= ~SKY2_FLAG_RX_CHECKSUM;
                sky2_write32(sky2->hw, Q_ADDR(rxqaddr[sky2->port], Q_CSR),
                             BMU_DIS_RX_CHKSUM);
        }
}

/* Process status response ring */
static int sky2_status_intr(struct sky2_hw *hw, int to_do, u16 idx)
{
        int work_done = 0;
        unsigned int total_bytes[2] = { 0 };
        unsigned int total_packets[2] = { 0 };

        rmb();
        do {
                struct sky2_port *sky2;
                struct sky2_status_le *le  = hw->st_le + hw->st_idx;
                unsigned port;
                struct net_device *dev;
                struct sk_buff *skb;
                u32 status;
                u16 length;
                u8 opcode = le->opcode;

                if (!(opcode & HW_OWNER))
                        break;

                hw->st_idx = RING_NEXT(hw->st_idx, STATUS_RING_SIZE);

                port = le->css & CSS_LINK_BIT;
                dev = hw->dev[port];
                sky2 = netdev_priv(dev);
                length = le16_to_cpu(le->length);
                status = le32_to_cpu(le->status);

                le->opcode = 0;
                switch (opcode & ~HW_OWNER) {
                case OP_RXSTAT:
                        total_packets[port]++;
                        total_bytes[port] += length;

                        skb = sky2_receive(dev, length, status);
                        if (!skb)
                                break;

                        /* This chip reports checksum status differently */
                        if (hw->flags & SKY2_HW_NEW_LE) {
                                if ((sky2->flags & SKY2_FLAG_RX_CHECKSUM) &&
                                    (le->css & (CSS_ISIPV4 | CSS_ISIPV6)) &&
                                    (le->css & CSS_TCPUDPCSOK))
                                        skb->ip_summed = CHECKSUM_UNNECESSARY;
                                else
                                        skb->ip_summed = CHECKSUM_NONE;
                        }

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

                        sky2_skb_rx(sky2, status, skb);

                        /* Stop after net poll weight */
                        if (++work_done >= to_do)
                                goto exit_loop;
                        break;

#ifdef SKY2_VLAN_TAG_USED
                case OP_RXVLAN:
                        sky2->rx_tag = length;
                        break;

                case OP_RXCHKSVLAN:
                        sky2->rx_tag = length;
                        /* fall through */
#endif
                case OP_RXCHKS:
                        if (likely(sky2->flags & SKY2_FLAG_RX_CHECKSUM))
                                sky2_rx_checksum(sky2, status);
                        break;

                case OP_TXINDEXLE:
                        /* TX index reports status for both ports */
                        sky2_tx_done(hw->dev[0], status & 0xfff);
                        if (hw->dev[1])
                                sky2_tx_done(hw->dev[1],
                                     ((status >> 24) & 0xff)
                                             | (u16)(length & 0xf) << 8);
                        break;

                default:
                        if (net_ratelimit())
                                printk(KERN_WARNING PFX
                                       "unknown status opcode 0x%x\n", opcode);
                }
        } while (hw->st_idx != idx);

        /* Fully processed status ring so clear irq */
        sky2_write32(hw, STAT_CTRL, SC_STAT_CLR_IRQ);

exit_loop:
        sky2_rx_done(hw, 0, total_packets[0], total_bytes[0]);
        sky2_rx_done(hw, 1, total_packets[1], total_bytes[1]);

        return work_done;
}

static void sky2_hw_error(struct sky2_hw *hw, unsigned port, u32 status)
{
        struct net_device *dev = hw->dev[port];

        if (net_ratelimit())
                printk(KERN_INFO PFX "%s: hw error interrupt status 0x%x\n",
                       dev->name, status);

        if (status & Y2_IS_PAR_RD1) {
                if (net_ratelimit())
                        printk(KERN_ERR PFX "%s: ram data read parity error\n",
                               dev->name);
                /* Clear IRQ */
                sky2_write16(hw, RAM_BUFFER(port, B3_RI_CTRL), RI_CLR_RD_PERR);
        }

        if (status & Y2_IS_PAR_WR1) {
                if (net_ratelimit())
                        printk(KERN_ERR PFX "%s: ram data write parity error\n",
                               dev->name);

                sky2_write16(hw, RAM_BUFFER(port, B3_RI_CTRL), RI_CLR_WR_PERR);
        }

        if (status & Y2_IS_PAR_MAC1) {
                if (net_ratelimit())
                        printk(KERN_ERR PFX "%s: MAC parity error\n", dev->name);
                sky2_write8(hw, SK_REG(port, TX_GMF_CTRL_T), GMF_CLI_TX_PE);
        }

        if (status & Y2_IS_PAR_RX1) {
                if (net_ratelimit())
                        printk(KERN_ERR PFX "%s: RX parity error\n", dev->name);
                sky2_write32(hw, Q_ADDR(rxqaddr[port], Q_CSR), BMU_CLR_IRQ_PAR);
        }

        if (status & Y2_IS_TCP_TXA1) {
                if (net_ratelimit())
                        printk(KERN_ERR PFX "%s: TCP segmentation error\n",
                               dev->name);
                sky2_write32(hw, Q_ADDR(txqaddr[port], Q_CSR), BMU_CLR_IRQ_TCP);
        }
}

static void sky2_hw_intr(struct sky2_hw *hw)
{
        struct pci_dev *pdev = hw->pdev;
        u32 status = sky2_read32(hw, B0_HWE_ISRC);
        u32 hwmsk = sky2_read32(hw, B0_HWE_IMSK);

        status &= hwmsk;

        if (status & Y2_IS_TIST_OV)
                sky2_write8(hw, GMAC_TI_ST_CTRL, GMT_ST_CLR_IRQ);

        if (status & (Y2_IS_MST_ERR | Y2_IS_IRQ_STAT)) {
                u16 pci_err;

                sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_ON);
                pci_err = sky2_pci_read16(hw, PCI_STATUS);
                if (net_ratelimit())
                        dev_err(&pdev->dev, "PCI hardware error (0x%x)\n",
                                pci_err);

                sky2_pci_write16(hw, PCI_STATUS,
                                      pci_err | PCI_STATUS_ERROR_BITS);
                sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_OFF);
        }

        if (status & Y2_IS_PCI_EXP) {
                /* PCI-Express uncorrectable Error occurred */
                u32 err;

                sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_ON);
                err = sky2_read32(hw, Y2_CFG_AER + PCI_ERR_UNCOR_STATUS);
                sky2_write32(hw, Y2_CFG_AER + PCI_ERR_UNCOR_STATUS,
                             0xfffffffful);
                if (net_ratelimit())
                        dev_err(&pdev->dev, "PCI Express error (0x%x)\n", err);

                sky2_read32(hw, Y2_CFG_AER + PCI_ERR_UNCOR_STATUS);
                sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_OFF);
        }

        if (status & Y2_HWE_L1_MASK)
                sky2_hw_error(hw, 0, status);
        status >>= 8;
        if (status & Y2_HWE_L1_MASK)
                sky2_hw_error(hw, 1, status);
}

static void sky2_mac_intr(struct sky2_hw *hw, unsigned port)
{
        struct net_device *dev = hw->dev[port];
        struct sky2_port *sky2 = netdev_priv(dev);
        u8 status = sky2_read8(hw, SK_REG(port, GMAC_IRQ_SRC));

        if (netif_msg_intr(sky2))
                printk(KERN_INFO PFX "%s: mac interrupt status 0x%x\n",
                       dev->name, status);

        if (status & GM_IS_RX_CO_OV)
                gma_read16(hw, port, GM_RX_IRQ_SRC);

        if (status & GM_IS_TX_CO_OV)
                gma_read16(hw, port, GM_TX_IRQ_SRC);

        if (status & GM_IS_RX_FF_OR) {
                ++dev->stats.rx_fifo_errors;
                sky2_write8(hw, SK_REG(port, RX_GMF_CTRL_T), GMF_CLI_RX_FO);
        }

        if (status & GM_IS_TX_FF_UR) {
                ++dev->stats.tx_fifo_errors;
                sky2_write8(hw, SK_REG(port, TX_GMF_CTRL_T), GMF_CLI_TX_FU);
        }
}

/* This should never happen it is a bug. */
static void sky2_le_error(struct sky2_hw *hw, unsigned port, u16 q)
{
        struct net_device *dev = hw->dev[port];
        u16 idx = sky2_read16(hw, Y2_QADDR(q, PREF_UNIT_GET_IDX));

        dev_err(&hw->pdev->dev, PFX
                "%s: descriptor error q=%#x get=%u put=%u\n",
                dev->name, (unsigned) q, (unsigned) idx,
                (unsigned) sky2_read16(hw, Y2_QADDR(q, PREF_UNIT_PUT_IDX)));

        sky2_write32(hw, Q_ADDR(q, Q_CSR), BMU_CLR_IRQ_CHK);
}

static int sky2_rx_hung(struct net_device *dev)
{
        struct sky2_port *sky2 = netdev_priv(dev);
        struct sky2_hw *hw = sky2->hw;
        unsigned port = sky2->port;
        unsigned rxq = rxqaddr[port];
        u32 mac_rp = sky2_read32(hw, SK_REG(port, RX_GMF_RP));
        u8 mac_lev = sky2_read8(hw, SK_REG(port, RX_GMF_RLEV));
        u8 fifo_rp = sky2_read8(hw, Q_ADDR(rxq, Q_RP));
        u8 fifo_lev = sky2_read8(hw, Q_ADDR(rxq, Q_RL));

        /* If idle and MAC or PCI is stuck */
        if (sky2->check.last == dev->last_rx &&
            ((mac_rp == sky2->check.mac_rp &&
              mac_lev != 0 && mac_lev >= sky2->check.mac_lev) ||
             /* Check if the PCI RX hang */
             (fifo_rp == sky2->check.fifo_rp &&
              fifo_lev != 0 && fifo_lev >= sky2->check.fifo_lev))) {
                printk(KERN_DEBUG PFX "%s: hung mac %d:%d fifo %d (%d:%d)\n",
                       dev->name, mac_lev, mac_rp, fifo_lev, fifo_rp,
                       sky2_read8(hw, Q_ADDR(rxq, Q_WP)));
                return 1;
        } else {
                sky2->check.last = dev->last_rx;
                sky2->check.mac_rp = mac_rp;
                sky2->check.mac_lev = mac_lev;
                sky2->check.fifo_rp = fifo_rp;
                sky2->check.fifo_lev = fifo_lev;
                return 0;
        }
}

static void sky2_watchdog(unsigned long arg)
{
        struct sky2_hw *hw = (struct sky2_hw *) arg;

        /* Check for lost IRQ once a second */
        if (sky2_read32(hw, B0_ISRC)) {
                napi_schedule(&hw->napi);
        } else {
                int i, active = 0;

                for (i = 0; i < hw->ports; i++) {
                        struct net_device *dev = hw->dev[i];
                        if (!netif_running(dev))
                                continue;
                        ++active;

                        /* For chips with Rx FIFO, check if stuck */
                        if ((hw->flags & SKY2_HW_RAM_BUFFER) &&
                             sky2_rx_hung(dev)) {
                                pr_info(PFX "%s: receiver hang detected\n",
                                        dev->name);
                                schedule_work(&hw->restart_work);
                                return;
                        }
                }

                if (active == 0)
                        return;
        }

        mod_timer(&hw->watchdog_timer, round_jiffies(jiffies + HZ));
}

/* Hardware/software error handling */
static void sky2_err_intr(struct sky2_hw *hw, u32 status)
{
        if (net_ratelimit())
                dev_warn(&hw->pdev->dev, "error interrupt status=%#x\n", status);

        if (status & Y2_IS_HW_ERR)
                sky2_hw_intr(hw);

        if (status & Y2_IS_IRQ_MAC1)
                sky2_mac_intr(hw, 0);

        if (status & Y2_IS_IRQ_MAC2)
                sky2_mac_intr(hw, 1);

        if (status & Y2_IS_CHK_RX1)
                sky2_le_error(hw, 0, Q_R1);

        if (status & Y2_IS_CHK_RX2)
                sky2_le_error(hw, 1, Q_R2);

        if (status & Y2_IS_CHK_TXA1)
                sky2_le_error(hw, 0, Q_XA1);

        if (status & Y2_IS_CHK_TXA2)
                sky2_le_error(hw, 1, Q_XA2);
}

static int sky2_poll(struct napi_struct *napi, int work_limit)
{
        struct sky2_hw *hw = container_of(napi, struct sky2_hw, napi);
        u32 status = sky2_read32(hw, B0_Y2_SP_EISR);
        int work_done = 0;
        u16 idx;

        if (unlikely(status & Y2_IS_ERROR))
                sky2_err_intr(hw, status);

        if (status & Y2_IS_IRQ_PHY1)
                sky2_phy_intr(hw, 0);

        if (status & Y2_IS_IRQ_PHY2)
                sky2_phy_intr(hw, 1);

        if (status & Y2_IS_PHY_QLNK)
                sky2_qlink_intr(hw);

        while ((idx = sky2_read16(hw, STAT_PUT_IDX)) != hw->st_idx) {
                work_done += sky2_status_intr(hw, work_limit - work_done, idx);

                if (work_done >= work_limit)
                        goto done;
        }

        napi_complete(napi);
        sky2_read32(hw, B0_Y2_SP_LISR);
done:

        return work_done;
}

static irqreturn_t sky2_intr(int irq, void *dev_id)
{
        struct sky2_hw *hw = dev_id;
        u32 status;

        /* Reading this mask interrupts as side effect */
        status = sky2_read32(hw, B0_Y2_SP_ISRC2);
        if (status == 0 || status == ~0)
                return IRQ_NONE;

        prefetch(&hw->st_le[hw->st_idx]);

        napi_schedule(&hw->napi);

        return IRQ_HANDLED;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void sky2_netpoll(struct net_device *dev)
{
        struct sky2_port *sky2 = netdev_priv(dev);

        napi_schedule(&sky2->hw->napi);
}
#endif

/* Chip internal frequency for clock calculations */
static u32 sky2_mhz(const struct sky2_hw *hw)
{
        switch (hw->chip_id) {
        case CHIP_ID_YUKON_EC:
        case CHIP_ID_YUKON_EC_U:
        case CHIP_ID_YUKON_EX:
        case CHIP_ID_YUKON_SUPR:
        case CHIP_ID_YUKON_UL_2:
        case CHIP_ID_YUKON_OPT:
                return 125;

        case CHIP_ID_YUKON_FE:
                return 100;

        case CHIP_ID_YUKON_FE_P:
                return 50;

        case CHIP_ID_YUKON_XL:
                return 156;

        default:
                BUG();
        }
}

static inline u32 sky2_us2clk(const struct sky2_hw *hw, u32 us)
{
        return sky2_mhz(hw) * us;
}

static inline u32 sky2_clk2us(const struct sky2_hw *hw, u32 clk)
{
        return clk / sky2_mhz(hw);
}


static int __devinit sky2_init(struct sky2_hw *hw)
{
        u8 t8;

        /* Enable all clocks and check for bad PCI access */
        sky2_pci_write32(hw, PCI_DEV_REG3, 0);

        sky2_write8(hw, B0_CTST, CS_RST_CLR);

        hw->chip_id = sky2_read8(hw, B2_CHIP_ID);
        hw->chip_rev = (sky2_read8(hw, B2_MAC_CFG) & CFG_CHIP_R_MSK) >> 4;

        switch(hw->chip_id) {
        case CHIP_ID_YUKON_XL:
                hw->flags = SKY2_HW_GIGABIT | SKY2_HW_NEWER_PHY;
                break;

        case CHIP_ID_YUKON_EC_U:
                hw->flags = SKY2_HW_GIGABIT
                        | SKY2_HW_NEWER_PHY
                        | SKY2_HW_ADV_POWER_CTL;
                break;

        case CHIP_ID_YUKON_EX:
                hw->flags = SKY2_HW_GIGABIT
                        | SKY2_HW_NEWER_PHY
                        | SKY2_HW_NEW_LE
                        | SKY2_HW_ADV_POWER_CTL;

                /* New transmit checksum */
                if (hw->chip_rev != CHIP_REV_YU_EX_B0)
                        hw->flags |= SKY2_HW_AUTO_TX_SUM;
                break;

        case CHIP_ID_YUKON_EC:
                /* This rev is really old, and requires untested workarounds */
                if (hw->chip_rev == CHIP_REV_YU_EC_A1) {
                        dev_err(&hw->pdev->dev, "unsupported revision Yukon-EC rev A1\n");
                        return -EOPNOTSUPP;
                }
                hw->flags = SKY2_HW_GIGABIT;
                break;

        case CHIP_ID_YUKON_FE:
                break;

        case CHIP_ID_YUKON_FE_P:
                hw->flags = SKY2_HW_NEWER_PHY
                        | SKY2_HW_NEW_LE
                        | SKY2_HW_AUTO_TX_SUM
                        | SKY2_HW_ADV_POWER_CTL;
                break;

        case CHIP_ID_YUKON_SUPR:
                hw->flags = SKY2_HW_GIGABIT
                        | SKY2_HW_NEWER_PHY
                        | SKY2_HW_NEW_LE
                        | SKY2_HW_AUTO_TX_SUM
                        | SKY2_HW_ADV_POWER_CTL;
                break;

        case CHIP_ID_YUKON_UL_2:
                hw->flags = SKY2_HW_GIGABIT
                        | SKY2_HW_ADV_POWER_CTL;
                break;

        case CHIP_ID_YUKON_OPT:
                hw->flags = SKY2_HW_GIGABIT
                        | SKY2_HW_NEW_LE
                        | SKY2_HW_ADV_POWER_CTL;
                break;

        default:
                dev_err(&hw->pdev->dev, "unsupported chip type 0x%x\n",
                        hw->chip_id);
                return -EOPNOTSUPP;
        }

        hw->pmd_type = sky2_read8(hw, B2_PMD_TYP);
        if (hw->pmd_type == 'L' || hw->pmd_type == 'S' || hw->pmd_type == 'P')
                hw->flags |= SKY2_HW_FIBRE_PHY;

        hw->ports = 1;
        t8 = sky2_read8(hw, B2_Y2_HW_RES);
        if ((t8 & CFG_DUAL_MAC_MSK) == CFG_DUAL_MAC_MSK) {
                if (!(sky2_read8(hw, B2_Y2_CLK_GATE) & Y2_STATUS_LNK2_INAC))
                        ++hw->ports;
        }

        if (sky2_read8(hw, B2_E_0))
                hw->flags |= SKY2_HW_RAM_BUFFER;

        return 0;
}

static void sky2_reset(struct sky2_hw *hw)
{
        struct pci_dev *pdev = hw->pdev;
        u16 status;
        int i, cap;
        u32 hwe_mask = Y2_HWE_ALL_MASK;

        /* disable ASF */
        if (hw->chip_id == CHIP_ID_YUKON_EX
            || hw->chip_id == CHIP_ID_YUKON_SUPR) {
                sky2_write32(hw, CPU_WDOG, 0);
                status = sky2_read16(hw, HCU_CCSR);
                status &= ~(HCU_CCSR_AHB_RST | HCU_CCSR_CPU_RST_MODE |
                            HCU_CCSR_UC_STATE_MSK);
                /*
                 * CPU clock divider shouldn't be used because
                 * - ASF firmware may malfunction
                 * - Yukon-Supreme: Parallel FLASH doesn't support divided clocks
                 */
                status &= ~HCU_CCSR_CPU_CLK_DIVIDE_MSK;
                sky2_write16(hw, HCU_CCSR, status);
                sky2_write32(hw, CPU_WDOG, 0);
        } else
                sky2_write8(hw, B28_Y2_ASF_STAT_CMD, Y2_ASF_RESET);
        sky2_write16(hw, B0_CTST, Y2_ASF_DISABLE);

        /* do a SW reset */
        sky2_write8(hw, B0_CTST, CS_RST_SET);
        sky2_write8(hw, B0_CTST, CS_RST_CLR);

        /* allow writes to PCI config */
        sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_ON);

        /* clear PCI errors, if any */
        status = sky2_pci_read16(hw, PCI_STATUS);
        status |= PCI_STATUS_ERROR_BITS;
        sky2_pci_write16(hw, PCI_STATUS, status);

        sky2_write8(hw, B0_CTST, CS_MRST_CLR);

        cap = pci_find_capability(pdev, PCI_CAP_ID_EXP);
        if (cap) {
                sky2_write32(hw, Y2_CFG_AER + PCI_ERR_UNCOR_STATUS,
                             0xfffffffful);

                /* If error bit is stuck on ignore it */
                if (sky2_read32(hw, B0_HWE_ISRC) & Y2_IS_PCI_EXP)
                        dev_info(&pdev->dev, "ignoring stuck error report bit\n");
                else
                        hwe_mask |= Y2_IS_PCI_EXP;
        }

        sky2_power_on(hw);
        sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_OFF);

        for (i = 0; i < hw->ports; i++) {
                sky2_write8(hw, SK_REG(i, GMAC_LINK_CTRL), GMLC_RST_SET);
                sky2_write8(hw, SK_REG(i, GMAC_LINK_CTRL), GMLC_RST_CLR);

                if (hw->chip_id == CHIP_ID_YUKON_EX ||
                    hw->chip_id == CHIP_ID_YUKON_SUPR)
                        sky2_write16(hw, SK_REG(i, GMAC_CTRL),
                                     GMC_BYP_MACSECRX_ON | GMC_BYP_MACSECTX_ON
                                     | GMC_BYP_RETR_ON);

        }

        if (hw->chip_id == CHIP_ID_YUKON_SUPR && hw->chip_rev > CHIP_REV_YU_SU_B0) {
                /* enable MACSec clock gating */
                sky2_pci_write32(hw, PCI_DEV_REG3, P_CLK_MACSEC_DIS);
        }

        if (hw->chip_id == CHIP_ID_YUKON_OPT) {
                u16 reg;
                u32 msk;

                if (hw->chip_rev == 0) {
                        /* disable PCI-E PHY power down (set PHY reg 0x80, bit 7 */
                        sky2_write32(hw, Y2_PEX_PHY_DATA, (0x80UL << 16) | (1 << 7));

                        /* set PHY Link Detect Timer to 1.1 second (11x 100ms) */
                        reg = 10;
                } else {
                        /* set PHY Link Detect Timer to 0.4 second (4x 100ms) */
                        reg = 3;
                }

                reg <<= PSM_CONFIG_REG4_TIMER_PHY_LINK_DETECT_BASE;

                /* reset PHY Link Detect */
                sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_ON);
                sky2_pci_write16(hw, PSM_CONFIG_REG4,
                                 reg | PSM_CONFIG_REG4_RST_PHY_LINK_DETECT);
                sky2_pci_write16(hw, PSM_CONFIG_REG4, reg);


                /* enable PHY Quick Link */
                msk = sky2_read32(hw, B0_IMSK);
                msk |= Y2_IS_PHY_QLNK;
                sky2_write32(hw, B0_IMSK, msk);

                /* check if PSMv2 was running before */
                reg = sky2_pci_read16(hw, PSM_CONFIG_REG3);
                if (reg & PCI_EXP_LNKCTL_ASPMC) {
                        cap = pci_find_capability(pdev, PCI_CAP_ID_EXP);
                        /* restore the PCIe Link Control register */
                        sky2_pci_write16(hw, cap + PCI_EXP_LNKCTL, reg);
                }
                sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_OFF);

                /* re-enable PEX PM in PEX PHY debug reg. 8 (clear bit 12) */
                sky2_write32(hw, Y2_PEX_PHY_DATA, PEX_DB_ACCESS | (0x08UL << 16));
        }

        /* Clear I2C IRQ noise */
        sky2_write32(hw, B2_I2C_IRQ, 1);

        /* turn off hardware timer (unused) */
        sky2_write8(hw, B2_TI_CTRL, TIM_STOP);
        sky2_write8(hw, B2_TI_CTRL, TIM_CLR_IRQ);

        /* Turn off descriptor polling */
        sky2_write32(hw, B28_DPT_CTRL, DPT_STOP);

        /* Turn off receive timestamp */
        sky2_write8(hw, GMAC_TI_ST_CTRL, GMT_ST_STOP);
        sky2_write8(hw, GMAC_TI_ST_CTRL, GMT_ST_CLR_IRQ);

        /* enable the Tx Arbiters */
        for (i = 0; i < hw->ports; i++)
                sky2_write8(hw, SK_REG(i, TXA_CTRL), TXA_ENA_ARB);

        /* Initialize ram interface */
        for (i = 0; i < hw->ports; i++) {
                sky2_write8(hw, RAM_BUFFER(i, B3_RI_CTRL), RI_RST_CLR);

                sky2_write8(hw, RAM_BUFFER(i, B3_RI_WTO_R1), SK_RI_TO_53);
                sky2_write8(hw, RAM_BUFFER(i, B3_RI_WTO_XA1), SK_RI_TO_53);
                sky2_write8(hw, RAM_BUFFER(i, B3_RI_WTO_XS1), SK_RI_TO_53);
                sky2_write8(hw, RAM_BUFFER(i, B3_RI_RTO_R1), SK_RI_TO_53);
                sky2_write8(hw, RAM_BUFFER(i, B3_RI_RTO_XA1), SK_RI_TO_53);
                sky2_write8(hw, RAM_BUFFER(i, B3_RI_RTO_XS1), SK_RI_TO_53);
                sky2_write8(hw, RAM_BUFFER(i, B3_RI_WTO_R2), SK_RI_TO_53);
                sky2_write8(hw, RAM_BUFFER(i, B3_RI_WTO_XA2), SK_RI_TO_53);
                sky2_write8(hw, RAM_BUFFER(i, B3_RI_WTO_XS2), SK_RI_TO_53);
                sky2_write8(hw, RAM_BUFFER(i, B3_RI_RTO_R2), SK_RI_TO_53);
                sky2_write8(hw, RAM_BUFFER(i, B3_RI_RTO_XA2), SK_RI_TO_53);
                sky2_write8(hw, RAM_BUFFER(i, B3_RI_RTO_XS2), SK_RI_TO_53);
        }

        sky2_write32(hw, B0_HWE_IMSK, hwe_mask);

        for (i = 0; i < hw->ports; i++)
                sky2_gmac_reset(hw, i);

        memset(hw->st_le, 0, STATUS_LE_BYTES);
        hw->st_idx = 0;

        sky2_write32(hw, STAT_CTRL, SC_STAT_RST_SET);
        sky2_write32(hw, STAT_CTRL, SC_STAT_RST_CLR);

        sky2_write32(hw, STAT_LIST_ADDR_LO, hw->st_dma);
        sky2_write32(hw, STAT_LIST_ADDR_HI, (u64) hw->st_dma >> 32);

        /* Set the list last index */
        sky2_write16(hw, STAT_LAST_IDX, STATUS_RING_SIZE - 1);

        sky2_write16(hw, STAT_TX_IDX_TH, 10);
        sky2_write8(hw, STAT_FIFO_WM, 16);

        /* set Status-FIFO ISR watermark */
        if (hw->chip_id == CHIP_ID_YUKON_XL && hw->chip_rev == 0)
                sky2_write8(hw, STAT_FIFO_ISR_WM, 4);
        else
                sky2_write8(hw, STAT_FIFO_ISR_WM, 16);

        sky2_write32(hw, STAT_TX_TIMER_INI, sky2_us2clk(hw, 1000));
        sky2_write32(hw, STAT_ISR_TIMER_INI, sky2_us2clk(hw, 20));
        sky2_write32(hw, STAT_LEV_TIMER_INI, sky2_us2clk(hw, 100));

        /* enable status unit */
        sky2_write32(hw, STAT_CTRL, SC_STAT_OP_ON);

        sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_START);
        sky2_write8(hw, STAT_LEV_TIMER_CTRL, TIM_START);
        sky2_write8(hw, STAT_ISR_TIMER_CTRL, TIM_START);
}

/* Take device down (offline).
 * Equivalent to doing dev_stop() but this does not
 * inform upper layers of the transistion.
 */
static void sky2_detach(struct net_device *dev)
{
        if (netif_running(dev)) {
                netif_tx_lock(dev);
                netif_device_detach(dev);       /* stop txq */
                netif_tx_unlock(dev);
                sky2_down(dev);
        }
}

/* Bring device back after doing sky2_detach */
static int sky2_reattach(struct net_device *dev)
{
        int err = 0;

        if (netif_running(dev)) {
                err = sky2_up(dev);
                if (err) {
                        printk(KERN_INFO PFX "%s: could not restart %d\n",
                               dev->name, err);
                        dev_close(dev);
                } else {
                        netif_device_attach(dev);
                        sky2_set_multicast(dev);
                }
        }

        return err;
}

static void sky2_restart(struct work_struct *work)
{
        struct sky2_hw *hw = container_of(work, struct sky2_hw, restart_work);
        u32 imask;
        int i;

        rtnl_lock();

        napi_disable(&hw->napi);
        synchronize_irq(hw->pdev->irq);
        imask = sky2_read32(hw, B0_IMSK);
        sky2_write32(hw, B0_IMSK, 0);

        for (i = 0; i < hw->ports; i++) {
                struct net_device *dev = hw->dev[i];
                struct sky2_port *sky2 = netdev_priv(dev);

                if (!netif_running(dev))
                        continue;

                netif_carrier_off(dev);
                netif_tx_disable(dev);
                sky2_hw_down(sky2);
        }

        sky2_reset(hw);

        for (i = 0; i < hw->ports; i++) {
                struct net_device *dev = hw->dev[i];
                struct sky2_port *sky2 = netdev_priv(dev);

                if (!netif_running(dev))
                        continue;

                sky2_hw_up(sky2);
                netif_wake_queue(dev);
        }

        sky2_write32(hw, B0_IMSK, imask);
        sky2_read32(hw, B0_IMSK);

        sky2_read32(hw, B0_Y2_SP_LISR);
        napi_enable(&hw->napi);

        rtnl_unlock();
}

static inline u8 sky2_wol_supported(const struct sky2_hw *hw)
{
        return sky2_is_copper(hw) ? (WAKE_PHY | WAKE_MAGIC) : 0;
}

static void sky2_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
{
        const struct sky2_port *sky2 = netdev_priv(dev);

        wol->supported = sky2_wol_supported(sky2->hw);
        wol->wolopts = sky2->wol;
}

static int sky2_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
{
        struct sky2_port *sky2 = netdev_priv(dev);
        struct sky2_hw *hw = sky2->hw;

        if ((wol->wolopts & ~sky2_wol_supported(sky2->hw)) ||
            !device_can_wakeup(&hw->pdev->dev))
                return -EOPNOTSUPP;

        sky2->wol = wol->wolopts;
        return 0;
}

static u32 sky2_supported_modes(const struct sky2_hw *hw)
{
        if (sky2_is_copper(hw)) {
                u32 modes = SUPPORTED_10baseT_Half
                        | SUPPORTED_10baseT_Full
                        | SUPPORTED_100baseT_Half
                        | SUPPORTED_100baseT_Full
                        | SUPPORTED_Autoneg | SUPPORTED_TP;

                if (hw->flags & SKY2_HW_GIGABIT)
                        modes |= SUPPORTED_1000baseT_Half
                                | SUPPORTED_1000baseT_Full;
                return modes;
        } else
                return  SUPPORTED_1000baseT_Half
                        | SUPPORTED_1000baseT_Full
                        | SUPPORTED_Autoneg
                        | SUPPORTED_FIBRE;
}

static int sky2_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
{
        struct sky2_port *sky2 = netdev_priv(dev);
        struct sky2_hw *hw = sky2->hw;

        ecmd->transceiver = XCVR_INTERNAL;
        ecmd->supported = sky2_supported_modes(hw);
        ecmd->phy_address = PHY_ADDR_MARV;
        if (sky2_is_copper(hw)) {
                ecmd->port = PORT_TP;
                ecmd->speed = sky2->speed;
        } else {
                ecmd->speed = SPEED_1000;
                ecmd->port = PORT_FIBRE;
        }

        ecmd->advertising = sky2->advertising;
        ecmd->autoneg = (sky2->flags & SKY2_FLAG_AUTO_SPEED)
                ? AUTONEG_ENABLE : AUTONEG_DISABLE;
        ecmd->duplex = sky2->duplex;
        return 0;
}

static int sky2_set_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
{
        struct sky2_port *sky2 = netdev_priv(dev);
        const struct sky2_hw *hw = sky2->hw;
        u32 supported = sky2_supported_modes(hw);

        if (ecmd->autoneg == AUTONEG_ENABLE) {
                sky2->flags |= SKY2_FLAG_AUTO_SPEED;
                ecmd->advertising = supported;
                sky2->duplex = -1;
                sky2->speed = -1;
        } else {
                u32 setting;

                switch (ecmd->speed) {
                case SPEED_1000:
                        if (ecmd->duplex == DUPLEX_FULL)
                                setting = SUPPORTED_1000baseT_Full;
                        else if (ecmd->duplex == DUPLEX_HALF)
                                setting = SUPPORTED_1000baseT_Half;
                        else
                                return -EINVAL;
                        break;
                case SPEED_100:
                        if (ecmd->duplex == DUPLEX_FULL)
                                setting = SUPPORTED_100baseT_Full;
                        else if (ecmd->duplex == DUPLEX_HALF)
                                setting = SUPPORTED_100baseT_Half;
                        else
                                return -EINVAL;
                        break;

                case SPEED_10:
                        if (ecmd->duplex == DUPLEX_FULL)
                                setting = SUPPORTED_10baseT_Full;
                        else if (ecmd->duplex == DUPLEX_HALF)
                                setting = SUPPORTED_10baseT_Half;
                        else
                                return -EINVAL;
                        break;
                default:
                        return -EINVAL;
                }

                if ((setting & supported) == 0)
                        return -EINVAL;

                sky2->speed = ecmd->speed;
                sky2->duplex = ecmd->duplex;
                sky2->flags &= ~SKY2_FLAG_AUTO_SPEED;
        }

        sky2->advertising = ecmd->advertising;

        if (netif_running(dev)) {
                sky2_phy_reinit(sky2);
                sky2_set_multicast(dev);
        }

        return 0;
}

static void sky2_get_drvinfo(struct net_device *dev,
                             struct ethtool_drvinfo *info)
{
        struct sky2_port *sky2 = netdev_priv(dev);

        strcpy(info->driver, DRV_NAME);
        strcpy(info->version, DRV_VERSION);
        strcpy(info->fw_version, "N/A");
        strcpy(info->bus_info, pci_name(sky2->hw->pdev));
}

static const struct sky2_stat {
        char name[ETH_GSTRING_LEN];
        u16 offset;
} sky2_stats[] = {
        { "tx_bytes",      GM_TXO_OK_HI },
        { "rx_bytes",      GM_RXO_OK_HI },
        { "tx_broadcast",  GM_TXF_BC_OK },
        { "rx_broadcast",  GM_RXF_BC_OK },
        { "tx_multicast",  GM_TXF_MC_OK },
        { "rx_multicast",  GM_RXF_MC_OK },
        { "tx_unicast",    GM_TXF_UC_OK },
        { "rx_unicast",    GM_RXF_UC_OK },
        { "tx_mac_pause",  GM_TXF_MPAUSE },
        { "rx_mac_pause",  GM_RXF_MPAUSE },
        { "collisions",    GM_TXF_COL },
        { "late_collision",GM_TXF_LAT_COL },
        { "aborted",       GM_TXF_ABO_COL },
        { "single_collisions", GM_TXF_SNG_COL },
        { "multi_collisions", GM_TXF_MUL_COL },

        { "rx_short",      GM_RXF_SHT },
        { "rx_runt",       GM_RXE_FRAG },
        { "rx_64_byte_packets", GM_RXF_64B },
        { "rx_65_to_127_byte_packets", GM_RXF_127B },
        { "rx_128_to_255_byte_packets", GM_RXF_255B },
        { "rx_256_to_511_byte_packets", GM_RXF_511B },
        { "rx_512_to_1023_byte_packets", GM_RXF_1023B },
        { "rx_1024_to_1518_byte_packets", GM_RXF_1518B },
        { "rx_1518_to_max_byte_packets", GM_RXF_MAX_SZ },
        { "rx_too_long",   GM_RXF_LNG_ERR },
        { "rx_fifo_overflow", GM_RXE_FIFO_OV },
        { "rx_jabber",     GM_RXF_JAB_PKT },
        { "rx_fcs_error",   GM_RXF_FCS_ERR },

        { "tx_64_byte_packets", GM_TXF_64B },
        { "tx_65_to_127_byte_packets", GM_TXF_127B },
        { "tx_128_to_255_byte_packets", GM_TXF_255B },
        { "tx_256_to_511_byte_packets", GM_TXF_511B },
        { "tx_512_to_1023_byte_packets", GM_TXF_1023B },
        { "tx_1024_to_1518_byte_packets", GM_TXF_1518B },
        { "tx_1519_to_max_byte_packets", GM_TXF_MAX_SZ },
        { "tx_fifo_underrun", GM_TXE_FIFO_UR },
};

static u32 sky2_get_rx_csum(struct net_device *dev)
{
        struct sky2_port *sky2 = netdev_priv(dev);

        return !!(sky2->flags & SKY2_FLAG_RX_CHECKSUM);
}

static int sky2_set_rx_csum(struct net_device *dev, u32 data)
{
        struct sky2_port *sky2 = netdev_priv(dev);

        if (data)
                sky2->flags |= SKY2_FLAG_RX_CHECKSUM;
        else
                sky2->flags &= ~SKY2_FLAG_RX_CHECKSUM;

        sky2_write32(sky2->hw, Q_ADDR(rxqaddr[sky2->port], Q_CSR),
                     data ? BMU_ENA_RX_CHKSUM : BMU_DIS_RX_CHKSUM);

        return 0;
}

static u32 sky2_get_msglevel(struct net_device *netdev)
{
        struct sky2_port *sky2 = netdev_priv(netdev);
        return sky2->msg_enable;
}

static int sky2_nway_reset(struct net_device *dev)
{
        struct sky2_port *sky2 = netdev_priv(dev);

        if (!netif_running(dev) || !(sky2->flags & SKY2_FLAG_AUTO_SPEED))
                return -EINVAL;

        sky2_phy_reinit(sky2);
        sky2_set_multicast(dev);

        return 0;
}

static void sky2_phy_stats(struct sky2_port *sky2, u64 * data, unsigned count)
{
        struct sky2_hw *hw = sky2->hw;
        unsigned port = sky2->port;
        int i;

        data[0] = (u64) gma_read32(hw, port, GM_TXO_OK_HI) << 32
            | (u64) gma_read32(hw, port, GM_TXO_OK_LO);
        data[1] = (u64) gma_read32(hw, port, GM_RXO_OK_HI) << 32
            | (u64) gma_read32(hw, port, GM_RXO_OK_LO);

        for (i = 2; i < count; i++)
                data[i] = (u64) gma_read32(hw, port, sky2_stats[i].offset);
}

static void sky2_set_msglevel(struct net_device *netdev, u32 value)
{
        struct sky2_port *sky2 = netdev_priv(netdev);
        sky2->msg_enable = value;
}

static int sky2_get_sset_count(struct net_device *dev, int sset)
{
        switch (sset) {
        case ETH_SS_STATS:
                return ARRAY_SIZE(sky2_stats);
        default:
                return -EOPNOTSUPP;
        }
}

static void sky2_get_ethtool_stats(struct net_device *dev,
                                   struct ethtool_stats *stats, u64 * data)
{
        struct sky2_port *sky2 = netdev_priv(dev);

        sky2_phy_stats(sky2, data, ARRAY_SIZE(sky2_stats));
}

static void sky2_get_strings(struct net_device *dev, u32 stringset, u8 * data)
{
        int i;

        switch (stringset) {
        case ETH_SS_STATS:
                for (i = 0; i < ARRAY_SIZE(sky2_stats); i++)
                        memcpy(data + i * ETH_GSTRING_LEN,
                               sky2_stats[i].name, ETH_GSTRING_LEN);
                break;
        }
}

static int sky2_set_mac_address(struct net_device *dev, void *p)
{
        struct sky2_port *sky2 = netdev_priv(dev);
        struct sky2_hw *hw = sky2->hw;
        unsigned port = sky2->port;
        const struct sockaddr *addr = p;

        if (!is_valid_ether_addr(addr->sa_data))
                return -EADDRNOTAVAIL;

        memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
        memcpy_toio(hw->regs + B2_MAC_1 + port * 8,
                    dev->dev_addr, ETH_ALEN);
        memcpy_toio(hw->regs + B2_MAC_2 + port * 8,
                    dev->dev_addr, ETH_ALEN);

        /* virtual address for data */
        gma_set_addr(hw, port, GM_SRC_ADDR_2L, dev->dev_addr);

        /* physical address: used for pause frames */
        gma_set_addr(hw, port, GM_SRC_ADDR_1L, dev->dev_addr);

        return 0;
}

static void inline sky2_add_filter(u8 filter[8], const u8 *addr)
{
        u32 bit;

        bit = ether_crc(ETH_ALEN, addr) & 63;
        filter[bit >> 3] |= 1 << (bit & 7);
}

static void sky2_set_multicast(struct net_device *dev)
{
        struct sky2_port *sky2 = netdev_priv(dev);
        struct sky2_hw *hw = sky2->hw;
        unsigned port = sky2->port;
        struct dev_mc_list *list = dev->mc_list;
        u16 reg;
        u8 filter[8];
        int rx_pause;
        static const u8 pause_mc_addr[ETH_ALEN] = { 0x1, 0x80, 0xc2, 0x0, 0x0, 0x1 };

        rx_pause = (sky2->flow_status == FC_RX || sky2->flow_status == FC_BOTH);
        memset(filter, 0, sizeof(filter));

        reg = gma_read16(hw, port, GM_RX_CTRL);
        reg |= GM_RXCR_UCF_ENA;

        if (dev->flags & IFF_PROMISC)   /* promiscuous */
                reg &= ~(GM_RXCR_UCF_ENA | GM_RXCR_MCF_ENA);
        else if (dev->flags & IFF_ALLMULTI)
                memset(filter, 0xff, sizeof(filter));
        else if (netdev_mc_empty(dev) && !rx_pause)
                reg &= ~GM_RXCR_MCF_ENA;
        else {
                int i;
                reg |= GM_RXCR_MCF_ENA;

                if (rx_pause)
                        sky2_add_filter(filter, pause_mc_addr);

                for (i = 0; list && i < netdev_mc_count(dev); i++, list = list->next)
                        sky2_add_filter(filter, list->dmi_addr);
        }

        gma_write16(hw, port, GM_MC_ADDR_H1,
                    (u16) filter[0] | ((u16) filter[1] << 8));
        gma_write16(hw, port, GM_MC_ADDR_H2,
                    (u16) filter[2] | ((u16) filter[3] << 8));
        gma_write16(hw, port, GM_MC_ADDR_H3,
                    (u16) filter[4] | ((u16) filter[5] << 8));
        gma_write16(hw, port, GM_MC_ADDR_H4,
                    (u16) filter[6] | ((u16) filter[7] << 8));

        gma_write16(hw, port, GM_RX_CTRL, reg);
}

/* Can have one global because blinking is controlled by
 * ethtool and that is always under RTNL mutex
 */
static void sky2_led(struct sky2_port *sky2, enum led_mode mode)
{
        struct sky2_hw *hw = sky2->hw;
        unsigned port = sky2->port;

        spin_lock_bh(&sky2->phy_lock);
        if (hw->chip_id == CHIP_ID_YUKON_EC_U ||
            hw->chip_id == CHIP_ID_YUKON_EX ||
            hw->chip_id == CHIP_ID_YUKON_SUPR) {
                u16 pg;
                pg = gm_phy_read(hw, port, PHY_MARV_EXT_ADR);
                gm_phy_write(hw, port, PHY_MARV_EXT_ADR, 3);

                switch (mode) {
                case MO_LED_OFF:
                        gm_phy_write(hw, port, PHY_MARV_PHY_CTRL,
                                     PHY_M_LEDC_LOS_CTRL(8) |
                                     PHY_M_LEDC_INIT_CTRL(8) |
                                     PHY_M_LEDC_STA1_CTRL(8) |
                                     PHY_M_LEDC_STA0_CTRL(8));
                        break;
                case MO_LED_ON:
                        gm_phy_write(hw, port, PHY_MARV_PHY_CTRL,
                                     PHY_M_LEDC_LOS_CTRL(9) |
                                     PHY_M_LEDC_INIT_CTRL(9) |
                                     PHY_M_LEDC_STA1_CTRL(9) |
                                     PHY_M_LEDC_STA0_CTRL(9));
                        break;
                case MO_LED_BLINK:
                        gm_phy_write(hw, port, PHY_MARV_PHY_CTRL,
                                     PHY_M_LEDC_LOS_CTRL(0xa) |
                                     PHY_M_LEDC_INIT_CTRL(0xa) |
                                     PHY_M_LEDC_STA1_CTRL(0xa) |
                                     PHY_M_LEDC_STA0_CTRL(0xa));
                        break;
                case MO_LED_NORM:
                        gm_phy_write(hw, port, PHY_MARV_PHY_CTRL,
                                     PHY_M_LEDC_LOS_CTRL(1) |
                                     PHY_M_LEDC_INIT_CTRL(8) |
                                     PHY_M_LEDC_STA1_CTRL(7) |
                                     PHY_M_LEDC_STA0_CTRL(7));
                }

                gm_phy_write(hw, port, PHY_MARV_EXT_ADR, pg);
        } else
                gm_phy_write(hw, port, PHY_MARV_LED_OVER,
                                     PHY_M_LED_MO_DUP(mode) |
                                     PHY_M_LED_MO_10(mode) |
                                     PHY_M_LED_MO_100(mode) |
                                     PHY_M_LED_MO_1000(mode) |
                                     PHY_M_LED_MO_RX(mode) |
                                     PHY_M_LED_MO_TX(mode));

        spin_unlock_bh(&sky2->phy_lock);
}

/* blink LED's for finding board */
static int sky2_phys_id(struct net_device *dev, u32 data)
{
        struct sky2_port *sky2 = netdev_priv(dev);
        unsigned int i;

        if (data == 0)
                data = UINT_MAX;

        for (i = 0; i < data; i++) {
                sky2_led(sky2, MO_LED_ON);
                if (msleep_interruptible(500))
                        break;
                sky2_led(sky2, MO_LED_OFF);
                if (msleep_interruptible(500))
                        break;
        }
        sky2_led(sky2, MO_LED_NORM);

        return 0;
}

static void sky2_get_pauseparam(struct net_device *dev,
                                struct ethtool_pauseparam *ecmd)
{
        struct sky2_port *sky2 = netdev_priv(dev);

        switch (sky2->flow_mode) {
        case FC_NONE:
                ecmd->tx_pause = ecmd->rx_pause = 0;
                break;
        case FC_TX:
                ecmd->tx_pause = 1, ecmd->rx_pause = 0;
                break;
        case FC_RX:
                ecmd->tx_pause = 0, ecmd->rx_pause = 1;
                break;
        case FC_BOTH:
                ecmd->tx_pause = ecmd->rx_pause = 1;
        }

        ecmd->autoneg = (sky2->flags & SKY2_FLAG_AUTO_PAUSE)
                ? AUTONEG_ENABLE : AUTONEG_DISABLE;
}

static int sky2_set_pauseparam(struct net_device *dev,
                               struct ethtool_pauseparam *ecmd)
{
        struct sky2_port *sky2 = netdev_priv(dev);

        if (ecmd->autoneg == AUTONEG_ENABLE)
                sky2->flags |= SKY2_FLAG_AUTO_PAUSE;
        else
                sky2->flags &= ~SKY2_FLAG_AUTO_PAUSE;

        sky2->flow_mode = sky2_flow(ecmd->rx_pause, ecmd->tx_pause);

        if (netif_running(dev))
                sky2_phy_reinit(sky2);

        return 0;
}

static int sky2_get_coalesce(struct net_device *dev,
                             struct ethtool_coalesce *ecmd)
{
        struct sky2_port *sky2 = netdev_priv(dev);
        struct sky2_hw *hw = sky2->hw;

        if (sky2_read8(hw, STAT_TX_TIMER_CTRL) == TIM_STOP)
                ecmd->tx_coalesce_usecs = 0;
        else {
                u32 clks = sky2_read32(hw, STAT_TX_TIMER_INI);
                ecmd->tx_coalesce_usecs = sky2_clk2us(hw, clks);
        }
        ecmd->tx_max_coalesced_frames = sky2_read16(hw, STAT_TX_IDX_TH);

        if (sky2_read8(hw, STAT_LEV_TIMER_CTRL) == TIM_STOP)
                ecmd->rx_coalesce_usecs = 0;
        else {
                u32 clks = sky2_read32(hw, STAT_LEV_TIMER_INI);
                ecmd->rx_coalesce_usecs = sky2_clk2us(hw, clks);
        }
        ecmd->rx_max_coalesced_frames = sky2_read8(hw, STAT_FIFO_WM);

        if (sky2_read8(hw, STAT_ISR_TIMER_CTRL) == TIM_STOP)
                ecmd->rx_coalesce_usecs_irq = 0;
        else {
                u32 clks = sky2_read32(hw, STAT_ISR_TIMER_INI);
                ecmd->rx_coalesce_usecs_irq = sky2_clk2us(hw, clks);
        }

        ecmd->rx_max_coalesced_frames_irq = sky2_read8(hw, STAT_FIFO_ISR_WM);

        return 0;
}

/* Note: this affect both ports */
static int sky2_set_coalesce(struct net_device *dev,
                             struct ethtool_coalesce *ecmd)
{
        struct sky2_port *sky2 = netdev_priv(dev);
        struct sky2_hw *hw = sky2->hw;
        const u32 tmax = sky2_clk2us(hw, 0x0ffffff);

        if (ecmd->tx_coalesce_usecs > tmax ||
            ecmd->rx_coalesce_usecs > tmax ||
            ecmd->rx_coalesce_usecs_irq > tmax)
                return -EINVAL;

        if (ecmd->tx_max_coalesced_frames >= sky2->tx_ring_size-1)
                return -EINVAL;
        if (ecmd->rx_max_coalesced_frames > RX_MAX_PENDING)
                return -EINVAL;
        if (ecmd->rx_max_coalesced_frames_irq >RX_MAX_PENDING)
                return -EINVAL;

        if (ecmd->tx_coalesce_usecs == 0)
                sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_STOP);
        else {
                sky2_write32(hw, STAT_TX_TIMER_INI,
                             sky2_us2clk(hw, ecmd->tx_coalesce_usecs));
                sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_START);
        }
        sky2_write16(hw, STAT_TX_IDX_TH, ecmd->tx_max_coalesced_frames);

        if (ecmd->rx_coalesce_usecs == 0)
                sky2_write8(hw, STAT_LEV_TIMER_CTRL, TIM_STOP);
        else {
                sky2_write32(hw, STAT_LEV_TIMER_INI,
                             sky2_us2clk(hw, ecmd->rx_coalesce_usecs));
                sky2_write8(hw, STAT_LEV_TIMER_CTRL, TIM_START);
        }
        sky2_write8(hw, STAT_FIFO_WM, ecmd->rx_max_coalesced_frames);

        if (ecmd->rx_coalesce_usecs_irq == 0)
                sky2_write8(hw, STAT_ISR_TIMER_CTRL, TIM_STOP);
        else {
                sky2_write32(hw, STAT_ISR_TIMER_INI,
                             sky2_us2clk(hw, ecmd->rx_coalesce_usecs_irq));
                sky2_write8(hw, STAT_ISR_TIMER_CTRL, TIM_START);
        }
        sky2_write8(hw, STAT_FIFO_ISR_WM, ecmd->rx_max_coalesced_frames_irq);
        return 0;
}

static void sky2_get_ringparam(struct net_device *dev,
                               struct ethtool_ringparam *ering)
{
        struct sky2_port *sky2 = netdev_priv(dev);

        ering->rx_max_pending = RX_MAX_PENDING;
        ering->rx_mini_max_pending = 0;
        ering->rx_jumbo_max_pending = 0;
        ering->tx_max_pending = TX_MAX_PENDING;

        ering->rx_pending = sky2->rx_pending;
        ering->rx_mini_pending = 0;
        ering->rx_jumbo_pending = 0;
        ering->tx_pending = sky2->tx_pending;
}

static int sky2_set_ringparam(struct net_device *dev,
                              struct ethtool_ringparam *ering)
{
        struct sky2_port *sky2 = netdev_priv(dev);

        if (ering->rx_pending > RX_MAX_PENDING ||
            ering->rx_pending < 8 ||
            ering->tx_pending < TX_MIN_PENDING ||
            ering->tx_pending > TX_MAX_PENDING)
                return -EINVAL;

        sky2_detach(dev);

        sky2->rx_pending = ering->rx_pending;
        sky2->tx_pending = ering->tx_pending;
        sky2->tx_ring_size = roundup_pow_of_two(sky2->tx_pending+1);

        return sky2_reattach(dev);
}

static int sky2_get_regs_len(struct net_device *dev)
{
        return 0x4000;
}

static int sky2_reg_access_ok(struct sky2_hw *hw, unsigned int b)
{
        /* This complicated switch statement is to make sure and
         * only access regions that are unreserved.
         * Some blocks are only valid on dual port cards.
         */
        switch (b) {
        /* second port */
        case 5:         /* Tx Arbiter 2 */
        case 9:         /* RX2 */
        case 14 ... 15: /* TX2 */
        case 17: case 19: /* Ram Buffer 2 */
        case 22 ... 23: /* Tx Ram Buffer 2 */
        case 25:        /* Rx MAC Fifo 1 */
        case 27:        /* Tx MAC Fifo 2 */
        case 31:        /* GPHY 2 */
        case 40 ... 47: /* Pattern Ram 2 */
        case 52: case 54: /* TCP Segmentation 2 */
        case 112 ... 116: /* GMAC 2 */
                return hw->ports > 1;

        case 0:         /* Control */
        case 2:         /* Mac address */
        case 4:         /* Tx Arbiter 1 */
        case 7:         /* PCI express reg */
        case 8:         /* RX1 */
        case 12 ... 13: /* TX1 */
        case 16: case 18:/* Rx Ram Buffer 1 */
        case 20 ... 21: /* Tx Ram Buffer 1 */
        case 24:        /* Rx MAC Fifo 1 */
        case 26:        /* Tx MAC Fifo 1 */
        case 28 ... 29: /* Descriptor and status unit */
        case 30:        /* GPHY 1*/
        case 32 ... 39: /* Pattern Ram 1 */
        case 48: case 50: /* TCP Segmentation 1 */
        case 56 ... 60: /* PCI space */
        case 80 ... 84: /* GMAC 1 */
                return 1;

        default:
                return 0;
        }
}

/*
 * Returns copy of control register region
 * Note: ethtool_get_regs always provides full size (16k) buffer
 */
static void sky2_get_regs(struct net_device *dev, struct ethtool_regs *regs,
                          void *p)
{
        const struct sky2_port *sky2 = netdev_priv(dev);
        const void __iomem *io = sky2->hw->regs;
        unsigned int b;

        regs->version = 1;

        for (b = 0; b < 128; b++) {
                /* skip poisonous diagnostic ram region in block 3 */
                if (b == 3)
                        memcpy_fromio(p + 0x10, io + 0x10, 128 - 0x10);
                else if (sky2_reg_access_ok(sky2->hw, b))
                        memcpy_fromio(p, io, 128);
                else
                        memset(p, 0, 128);

                p += 128;
                io += 128;
        }
}

/* In order to do Jumbo packets on these chips, need to turn off the
 * transmit store/forward. Therefore checksum offload won't work.
 */
static int no_tx_offload(struct net_device *dev)
{
        const struct sky2_port *sky2 = netdev_priv(dev);
        const struct sky2_hw *hw = sky2->hw;

        return dev->mtu > ETH_DATA_LEN && hw->chip_id == CHIP_ID_YUKON_EC_U;
}

static int sky2_set_tx_csum(struct net_device *dev, u32 data)
{
        if (data && no_tx_offload(dev))
                return -EINVAL;

        return ethtool_op_set_tx_csum(dev, data);
}


static int sky2_set_tso(struct net_device *dev, u32 data)
{
        if (data && no_tx_offload(dev))
                return -EINVAL;

        return ethtool_op_set_tso(dev, data);
}

static int sky2_get_eeprom_len(struct net_device *dev)
{
        struct sky2_port *sky2 = netdev_priv(dev);
        struct sky2_hw *hw = sky2->hw;
        u16 reg2;

        reg2 = sky2_pci_read16(hw, PCI_DEV_REG2);
        return 1 << ( ((reg2 & PCI_VPD_ROM_SZ) >> 14) + 8);
}

static int sky2_vpd_wait(const struct sky2_hw *hw, int cap, u16 busy)
{
        unsigned long start = jiffies;

        while ( (sky2_pci_read16(hw, cap + PCI_VPD_ADDR) & PCI_VPD_ADDR_F) == busy) {
                /* Can take up to 10.6 ms for write */
                if (time_after(jiffies, start + HZ/4)) {
                        dev_err(&hw->pdev->dev, PFX "VPD cycle timed out");
                        return -ETIMEDOUT;
                }
                mdelay(1);
        }

        return 0;
}

static int sky2_vpd_read(struct sky2_hw *hw, int cap, void *data,
                         u16 offset, size_t length)
{
        int rc = 0;

        while (length > 0) {
                u32 val;

                sky2_pci_write16(hw, cap + PCI_VPD_ADDR, offset);
                rc = sky2_vpd_wait(hw, cap, 0);
                if (rc)
                        break;

                val = sky2_pci_read32(hw, cap + PCI_VPD_DATA);

                memcpy(data, &val, min(sizeof(val), length));
                offset += sizeof(u32);
                data += sizeof(u32);
                length -= sizeof(u32);
        }

        return rc;
}

static int sky2_vpd_write(struct sky2_hw *hw, int cap, const void *data,
                          u16 offset, unsigned int length)
{
        unsigned int i;
        int rc = 0;

        for (i = 0; i < length; i += sizeof(u32)) {
                u32 val = *(u32 *)(data + i);

                sky2_pci_write32(hw, cap + PCI_VPD_DATA, val);
                sky2_pci_write32(hw, cap + PCI_VPD_ADDR, offset | PCI_VPD_ADDR_F);

                rc = sky2_vpd_wait(hw, cap, PCI_VPD_ADDR_F);
                if (rc)
                        break;
        }
        return rc;
}

static int sky2_get_eeprom(struct net_device *dev, struct ethtool_eeprom *eeprom,
                           u8 *data)
{
        struct sky2_port *sky2 = netdev_priv(dev);
        int cap = pci_find_capability(sky2->hw->pdev, PCI_CAP_ID_VPD);

        if (!cap)
                return -EINVAL;

        eeprom->magic = SKY2_EEPROM_MAGIC;

        return sky2_vpd_read(sky2->hw, cap, data, eeprom->offset, eeprom->len);
}

static int sky2_set_eeprom(struct net_device *dev, struct ethtool_eeprom *eeprom,
                           u8 *data)
{
        struct sky2_port *sky2 = netdev_priv(dev);
        int cap = pci_find_capability(sky2->hw->pdev, PCI_CAP_ID_VPD);

        if (!cap)
                return -EINVAL;

        if (eeprom->magic != SKY2_EEPROM_MAGIC)
                return -EINVAL;

        /* Partial writes not supported */
        if ((eeprom->offset & 3) || (eeprom->len & 3))
                return -EINVAL;

        return sky2_vpd_write(sky2->hw, cap, data, eeprom->offset, eeprom->len);
}


static const struct ethtool_ops sky2_ethtool_ops = {
        .get_settings   = sky2_get_settings,
        .set_settings   = sky2_set_settings,
        .get_drvinfo    = sky2_get_drvinfo,
        .get_wol        = sky2_get_wol,
        .set_wol        = sky2_set_wol,
        .get_msglevel   = sky2_get_msglevel,
        .set_msglevel   = sky2_set_msglevel,
        .nway_reset     = sky2_nway_reset,
        .get_regs_len   = sky2_get_regs_len,
        .get_regs       = sky2_get_regs,
        .get_link       = ethtool_op_get_link,
        .get_eeprom_len = sky2_get_eeprom_len,
        .get_eeprom     = sky2_get_eeprom,
        .set_eeprom     = sky2_set_eeprom,
        .set_sg         = ethtool_op_set_sg,
        .set_tx_csum    = sky2_set_tx_csum,
        .set_tso        = sky2_set_tso,
        .get_rx_csum    = sky2_get_rx_csum,
        .set_rx_csum    = sky2_set_rx_csum,
        .get_strings    = sky2_get_strings,
        .get_coalesce   = sky2_get_coalesce,
        .set_coalesce   = sky2_set_coalesce,
        .get_ringparam  = sky2_get_ringparam,
        .set_ringparam  = sky2_set_ringparam,
        .get_pauseparam = sky2_get_pauseparam,
        .set_pauseparam = sky2_set_pauseparam,
        .phys_id        = sky2_phys_id,
        .get_sset_count = sky2_get_sset_count,
        .get_ethtool_stats = sky2_get_ethtool_stats,
};

#ifdef CONFIG_SKY2_DEBUG

static struct dentry *sky2_debug;


/*
 * Read and parse the first part of Vital Product Data
 */
#define VPD_SIZE        128
#define VPD_MAGIC       0x82

static const struct vpd_tag {
        char tag[2];
        char *label;
} vpd_tags[] = {
        { "PN", "Part Number" },
        { "EC", "Engineering Level" },
        { "MN", "Manufacturer" },
        { "SN", "Serial Number" },
        { "YA", "Asset Tag" },
        { "VL", "First Error Log Message" },
        { "VF", "Second Error Log Message" },
        { "VB", "Boot Agent ROM Configuration" },
        { "VE", "EFI UNDI Configuration" },
};

static void sky2_show_vpd(struct seq_file *seq, struct sky2_hw *hw)
{
        size_t vpd_size;
        loff_t offs;
        u8 len;
        unsigned char *buf;
        u16 reg2;

        reg2 = sky2_pci_read16(hw, PCI_DEV_REG2);
        vpd_size = 1 << ( ((reg2 & PCI_VPD_ROM_SZ) >> 14) + 8);

        seq_printf(seq, "%s Product Data\n", pci_name(hw->pdev));
        buf = kmalloc(vpd_size, GFP_KERNEL);
        if (!buf) {
                seq_puts(seq, "no memory!\n");
                return;
        }

        if (pci_read_vpd(hw->pdev, 0, vpd_size, buf) < 0) {
                seq_puts(seq, "VPD read failed\n");
                goto out;
        }

        if (buf[0] != VPD_MAGIC) {
                seq_printf(seq, "VPD tag mismatch: %#x\n", buf[0]);
                goto out;
        }
        len = buf[1];
        if (len == 0 || len > vpd_size - 4) {
                seq_printf(seq, "Invalid id length: %d\n", len);
                goto out;
        }

        seq_printf(seq, "%.*s\n", len, buf + 3);
        offs = len + 3;

        while (offs < vpd_size - 4) {
                int i;

                if (!memcmp("RW", buf + offs, 2))       /* end marker */
                        break;
                len = buf[offs + 2];
                if (offs + len + 3 >= vpd_size)
                        break;

                for (i = 0; i < ARRAY_SIZE(vpd_tags); i++) {
                        if (!memcmp(vpd_tags[i].tag, buf + offs, 2)) {
                                seq_printf(seq, " %s: %.*s\n",
                                           vpd_tags[i].label, len, buf + offs + 3);
                                break;
                        }
                }
                offs += len + 3;
        }
out:
        kfree(buf);
}

static int sky2_debug_show(struct seq_file *seq, void *v)
{
        struct net_device *dev = seq->private;
        const struct sky2_port *sky2 = netdev_priv(dev);
        struct sky2_hw *hw = sky2->hw;
        unsigned port = sky2->port;
        unsigned idx, last;
        int sop;

        sky2_show_vpd(seq, hw);

        seq_printf(seq, "\nIRQ src=%x mask=%x control=%x\n",
                   sky2_read32(hw, B0_ISRC),
                   sky2_read32(hw, B0_IMSK),
                   sky2_read32(hw, B0_Y2_SP_ICR));

        if (!netif_running(dev)) {
                seq_printf(seq, "network not running\n");
                return 0;
        }

        napi_disable(&hw->napi);
        last = sky2_read16(hw, STAT_PUT_IDX);

        if (hw->st_idx == last)
                seq_puts(seq, "Status ring (empty)\n");
        else {
                seq_puts(seq, "Status ring\n");
                for (idx = hw->st_idx; idx != last && idx < STATUS_RING_SIZE;
                     idx = RING_NEXT(idx, STATUS_RING_SIZE)) {
                        const struct sky2_status_le *le = hw->st_le + idx;
                        seq_printf(seq, "[%d] %#x %d %#x\n",
                                   idx, le->opcode, le->length, le->status);
                }
                seq_puts(seq, "\n");
        }

        seq_printf(seq, "Tx ring pending=%u...%u report=%d done=%d\n",
                   sky2->tx_cons, sky2->tx_prod,
                   sky2_read16(hw, port == 0 ? STAT_TXA1_RIDX : STAT_TXA2_RIDX),
                   sky2_read16(hw, Q_ADDR(txqaddr[port], Q_DONE)));

        /* Dump contents of tx ring */
        sop = 1;
        for (idx = sky2->tx_next; idx != sky2->tx_prod && idx < sky2->tx_ring_size;
             idx = RING_NEXT(idx, sky2->tx_ring_size)) {
                const struct sky2_tx_le *le = sky2->tx_le + idx;
                u32 a = le32_to_cpu(le->addr);

                if (sop)
                        seq_printf(seq, "%u:", idx);
                sop = 0;

                switch(le->opcode & ~HW_OWNER) {
                case OP_ADDR64:
                        seq_printf(seq, " %#x:", a);
                        break;
                case OP_LRGLEN:
                        seq_printf(seq, " mtu=%d", a);
                        break;
                case OP_VLAN:
                        seq_printf(seq, " vlan=%d", be16_to_cpu(le->length));
                        break;
                case OP_TCPLISW:
                        seq_printf(seq, " csum=%#x", a);
                        break;
                case OP_LARGESEND:
                        seq_printf(seq, " tso=%#x(%d)", a, le16_to_cpu(le->length));
                        break;
                case OP_PACKET:
                        seq_printf(seq, " %#x(%d)", a, le16_to_cpu(le->length));
                        break;
                case OP_BUFFER:
                        seq_printf(seq, " frag=%#x(%d)", a, le16_to_cpu(le->length));
                        break;
                default:
                        seq_printf(seq, " op=%#x,%#x(%d)", le->opcode,
                                   a, le16_to_cpu(le->length));
                }

                if (le->ctrl & EOP) {
                        seq_putc(seq, '\n');
                        sop = 1;
                }
        }

        seq_printf(seq, "\nRx ring hw get=%d put=%d last=%d\n",
                   sky2_read16(hw, Y2_QADDR(rxqaddr[port], PREF_UNIT_GET_IDX)),
                   sky2_read16(hw, Y2_QADDR(rxqaddr[port], PREF_UNIT_PUT_IDX)),
                   sky2_read16(hw, Y2_QADDR(rxqaddr[port], PREF_UNIT_LAST_IDX)));

        sky2_read32(hw, B0_Y2_SP_LISR);
        napi_enable(&hw->napi);
        return 0;
}

static int sky2_debug_open(struct inode *inode, struct file *file)
{
        return single_open(file, sky2_debug_show, inode->i_private);
}

static const struct file_operations sky2_debug_fops = {
        .owner          = THIS_MODULE,
        .open           = sky2_debug_open,
        .read           = seq_read,
        .llseek         = seq_lseek,
        .release        = single_release,
};

/*
 * Use network device events to create/remove/rename
 * debugfs file entries
 */
static int sky2_device_event(struct notifier_block *unused,
                             unsigned long event, void *ptr)
{
        struct net_device *dev = ptr;
        struct sky2_port *sky2 = netdev_priv(dev);

        if (dev->netdev_ops->ndo_open != sky2_up || !sky2_debug)
                return NOTIFY_DONE;

        switch(event) {
        case NETDEV_CHANGENAME:
                if (sky2->debugfs) {
                        sky2->debugfs = debugfs_rename(sky2_debug, sky2->debugfs,
                                                       sky2_debug, dev->name);
                }
                break;

        case NETDEV_GOING_DOWN:
                if (sky2->debugfs) {
                        printk(KERN_DEBUG PFX "%s: remove debugfs\n",
                               dev->name);
                        debugfs_remove(sky2->debugfs);
                        sky2->debugfs = NULL;
                }
                break;

        case NETDEV_UP:
                sky2->debugfs = debugfs_create_file(dev->name, S_IRUGO,
                                                    sky2_debug, dev,
                                                    &sky2_debug_fops);
                if (IS_ERR(sky2->debugfs))
                        sky2->debugfs = NULL;
        }

        return NOTIFY_DONE;
}

static struct notifier_block sky2_notifier = {
        .notifier_call = sky2_device_event,
};


static __init void sky2_debug_init(void)
{
        struct dentry *ent;

        ent = debugfs_create_dir("sky2", NULL);
        if (!ent || IS_ERR(ent))
                return;

        sky2_debug = ent;
        register_netdevice_notifier(&sky2_notifier);
}

static __exit void sky2_debug_cleanup(void)
{
        if (sky2_debug) {
                unregister_netdevice_notifier(&sky2_notifier);
                debugfs_remove(sky2_debug);
                sky2_debug = NULL;
        }
}

#else
#define sky2_debug_init()
#define sky2_debug_cleanup()
#endif

/* Two copies of network device operations to handle special case of
   not allowing netpoll on second port */
static const struct net_device_ops sky2_netdev_ops[2] = {
  {
        .ndo_open               = sky2_up,
        .ndo_stop               = sky2_down,
        .ndo_start_xmit         = sky2_xmit_frame,
        .ndo_do_ioctl           = sky2_ioctl,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_set_mac_address    = sky2_set_mac_address,
        .ndo_set_multicast_list = sky2_set_multicast,
        .ndo_change_mtu         = sky2_change_mtu,
        .ndo_tx_timeout         = sky2_tx_timeout,
#ifdef SKY2_VLAN_TAG_USED
        .ndo_vlan_rx_register   = sky2_vlan_rx_register,
#endif
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller    = sky2_netpoll,
#endif
  },
  {
        .ndo_open               = sky2_up,
        .ndo_stop               = sky2_down,
        .ndo_start_xmit         = sky2_xmit_frame,
        .ndo_do_ioctl           = sky2_ioctl,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_set_mac_address    = sky2_set_mac_address,
        .ndo_set_multicast_list = sky2_set_multicast,
        .ndo_change_mtu         = sky2_change_mtu,
        .ndo_tx_timeout         = sky2_tx_timeout,
#ifdef SKY2_VLAN_TAG_USED
        .ndo_vlan_rx_register   = sky2_vlan_rx_register,
#endif
  },
};

/* Initialize network device */
static __devinit struct net_device *sky2_init_netdev(struct sky2_hw *hw,
                                                     unsigned port,
                                                     int highmem, int wol)
{
        struct sky2_port *sky2;
        struct net_device *dev = alloc_etherdev(sizeof(*sky2));

        if (!dev) {
                dev_err(&hw->pdev->dev, "etherdev alloc failed\n");
                return NULL;
        }

        SET_NETDEV_DEV(dev, &hw->pdev->dev);
        dev->irq = hw->pdev->irq;
        SET_ETHTOOL_OPS(dev, &sky2_ethtool_ops);
        dev->watchdog_timeo = TX_WATCHDOG;
        dev->netdev_ops = &sky2_netdev_ops[port];

        sky2 = netdev_priv(dev);
        sky2->netdev = dev;
        sky2->hw = hw;
        sky2->msg_enable = netif_msg_init(debug, default_msg);

        /* Auto speed and flow control */
        sky2->flags = SKY2_FLAG_AUTO_SPEED | SKY2_FLAG_AUTO_PAUSE;
        if (hw->chip_id != CHIP_ID_YUKON_XL)
                sky2->flags |= SKY2_FLAG_RX_CHECKSUM;

        sky2->flow_mode = FC_BOTH;

        sky2->duplex = -1;
        sky2->speed = -1;
        sky2->advertising = sky2_supported_modes(hw);
        sky2->wol = wol;

        spin_lock_init(&sky2->phy_lock);

        sky2->tx_pending = TX_DEF_PENDING;
        sky2->tx_ring_size = roundup_pow_of_two(TX_DEF_PENDING+1);
        sky2->rx_pending = RX_DEF_PENDING;

        hw->dev[port] = dev;

        sky2->port = port;

        dev->features |= NETIF_F_TSO | NETIF_F_IP_CSUM | NETIF_F_SG;
        if (highmem)
                dev->features |= NETIF_F_HIGHDMA;

#ifdef SKY2_VLAN_TAG_USED
        /* The workaround for FE+ status conflicts with VLAN tag detection. */
        if (!(sky2->hw->chip_id == CHIP_ID_YUKON_FE_P &&
              sky2->hw->chip_rev == CHIP_REV_YU_FE2_A0)) {
                dev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
        }
#endif

        /* read the mac address */
        memcpy_fromio(dev->dev_addr, hw->regs + B2_MAC_1 + port * 8, ETH_ALEN);
        memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);

        return dev;
}

static void __devinit sky2_show_addr(struct net_device *dev)
{
        const struct sky2_port *sky2 = netdev_priv(dev);

        if (netif_msg_probe(sky2))
                printk(KERN_INFO PFX "%s: addr %pM\n",
                       dev->name, dev->dev_addr);
}

/* Handle software interrupt used during MSI test */
static irqreturn_t __devinit sky2_test_intr(int irq, void *dev_id)
{
        struct sky2_hw *hw = dev_id;
        u32 status = sky2_read32(hw, B0_Y2_SP_ISRC2);

        if (status == 0)
                return IRQ_NONE;

        if (status & Y2_IS_IRQ_SW) {
                hw->flags |= SKY2_HW_USE_MSI;
                wake_up(&hw->msi_wait);
                sky2_write8(hw, B0_CTST, CS_CL_SW_IRQ);
        }
        sky2_write32(hw, B0_Y2_SP_ICR, 2);

        return IRQ_HANDLED;
}

/* Test interrupt path by forcing a a software IRQ */
static int __devinit sky2_test_msi(struct sky2_hw *hw)
{
        struct pci_dev *pdev = hw->pdev;
        int err;

        init_waitqueue_head (&hw->msi_wait);

        sky2_write32(hw, B0_IMSK, Y2_IS_IRQ_SW);

        err = request_irq(pdev->irq, sky2_test_intr, 0, DRV_NAME, hw);
        if (err) {
                dev_err(&pdev->dev, "cannot assign irq %d\n", pdev->irq);
                return err;
        }

        sky2_write8(hw, B0_CTST, CS_ST_SW_IRQ);
        sky2_read8(hw, B0_CTST);

        wait_event_timeout(hw->msi_wait, (hw->flags & SKY2_HW_USE_MSI), HZ/10);

        if (!(hw->flags & SKY2_HW_USE_MSI)) {
                /* MSI test failed, go back to INTx mode */
                dev_info(&pdev->dev, "No interrupt generated using MSI, "
                         "switching to INTx mode.\n");

                err = -EOPNOTSUPP;
                sky2_write8(hw, B0_CTST, CS_CL_SW_IRQ);
        }

        sky2_write32(hw, B0_IMSK, 0);
        sky2_read32(hw, B0_IMSK);

        free_irq(pdev->irq, hw);

        return err;
}

/* This driver supports yukon2 chipset only */
static const char *sky2_name(u8 chipid, char *buf, int sz)
{
        const char *name[] = {
                "XL",           /* 0xb3 */
                "EC Ultra",     /* 0xb4 */
                "Extreme",      /* 0xb5 */
                "EC",           /* 0xb6 */
                "FE",           /* 0xb7 */
                "FE+",          /* 0xb8 */
                "Supreme",      /* 0xb9 */
                "UL 2",         /* 0xba */
                "Unknown",      /* 0xbb */
                "Optima",       /* 0xbc */
        };

        if (chipid >= CHIP_ID_YUKON_XL && chipid <= CHIP_ID_YUKON_OPT)
                strncpy(buf, name[chipid - CHIP_ID_YUKON_XL], sz);
        else
                snprintf(buf, sz, "(chip %#x)", chipid);
        return buf;
}

static int __devinit sky2_probe(struct pci_dev *pdev,
                                const struct pci_device_id *ent)
{
        struct net_device *dev;
        struct sky2_hw *hw;
        int err, using_dac = 0, wol_default;
        u32 reg;
        char buf1[16];

        err = pci_enable_device(pdev);
        if (err) {
                dev_err(&pdev->dev, "cannot enable PCI device\n");
                goto err_out;
        }

        /* Get configuration information
         * Note: only regular PCI config access once to test for HW issues
         *       other PCI access through shared memory for speed and to
         *       avoid MMCONFIG problems.
         */
        err = pci_read_config_dword(pdev, PCI_DEV_REG2, &reg);
        if (err) {
                dev_err(&pdev->dev, "PCI read config failed\n");
                goto err_out;
        }

        if (~reg == 0) {
                dev_err(&pdev->dev, "PCI configuration read error\n");
                goto err_out;
        }

        err = pci_request_regions(pdev, DRV_NAME);
        if (err) {
                dev_err(&pdev->dev, "cannot obtain PCI resources\n");
                goto err_out_disable;
        }

        pci_set_master(pdev);

        if (sizeof(dma_addr_t) > sizeof(u32) &&
            !(err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))) {
                using_dac = 1;
                err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
                if (err < 0) {
                        dev_err(&pdev->dev, "unable to obtain 64 bit DMA "
                                "for consistent allocations\n");
                        goto err_out_free_regions;
                }
        } else {
                err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
                if (err) {
                        dev_err(&pdev->dev, "no usable DMA configuration\n");
                        goto err_out_free_regions;
                }
        }


#ifdef __BIG_ENDIAN
        /* The sk98lin vendor driver uses hardware byte swapping but
         * this driver uses software swapping.
         */
        reg &= ~PCI_REV_DESC;
        err = pci_write_config_dword(pdev,PCI_DEV_REG2, reg);
        if (err) {
                dev_err(&pdev->dev, "PCI write config failed\n");
                goto err_out_free_regions;
        }
#endif

        wol_default = device_may_wakeup(&pdev->dev) ? WAKE_MAGIC : 0;

        err = -ENOMEM;

        hw = kzalloc(sizeof(*hw) + strlen(DRV_NAME "@pci:")
                     + strlen(pci_name(pdev)) + 1, GFP_KERNEL);
        if (!hw) {
                dev_err(&pdev->dev, "cannot allocate hardware struct\n");
                goto err_out_free_regions;
        }

        hw->pdev = pdev;
        sprintf(hw->irq_name, DRV_NAME "@pci:%s", pci_name(pdev));

        hw->regs = ioremap_nocache(pci_resource_start(pdev, 0), 0x4000);
        if (!hw->regs) {
                dev_err(&pdev->dev, "cannot map device registers\n");
                goto err_out_free_hw;
        }

        /* ring for status responses */
        hw->st_le = pci_alloc_consistent(pdev, STATUS_LE_BYTES, &hw->st_dma);
        if (!hw->st_le)
                goto err_out_iounmap;

        err = sky2_init(hw);
        if (err)
                goto err_out_iounmap;

        dev_info(&pdev->dev, "Yukon-2 %s chip revision %d\n",
                 sky2_name(hw->chip_id, buf1, sizeof(buf1)), hw->chip_rev);

        sky2_reset(hw);

        dev = sky2_init_netdev(hw, 0, using_dac, wol_default);
        if (!dev) {
                err = -ENOMEM;
                goto err_out_free_pci;
        }

        if (!disable_msi && pci_enable_msi(pdev) == 0) {
                err = sky2_test_msi(hw);
                if (err == -EOPNOTSUPP)
                        pci_disable_msi(pdev);
                else if (err)
                        goto err_out_free_netdev;
        }

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

        netif_carrier_off(dev);

        netif_napi_add(dev, &hw->napi, sky2_poll, NAPI_WEIGHT);

        err = request_irq(pdev->irq, sky2_intr,
                          (hw->flags & SKY2_HW_USE_MSI) ? 0 : IRQF_SHARED,
                          hw->irq_name, hw);
        if (err) {
                dev_err(&pdev->dev, "cannot assign irq %d\n", pdev->irq);
                goto err_out_unregister;
        }
        sky2_write32(hw, B0_IMSK, Y2_IS_BASE);
        napi_enable(&hw->napi);

        sky2_show_addr(dev);

        if (hw->ports > 1) {
                struct net_device *dev1;

                err = -ENOMEM;
                dev1 = sky2_init_netdev(hw, 1, using_dac, wol_default);
                if (dev1 && (err = register_netdev(dev1)) == 0)
                        sky2_show_addr(dev1);
                else {
                        dev_warn(&pdev->dev,
                                 "register of second port failed (%d)\n", err);
                        hw->dev[1] = NULL;
                        hw->ports = 1;
                        if (dev1)
                                free_netdev(dev1);
                }
        }

        setup_timer(&hw->watchdog_timer, sky2_watchdog, (unsigned long) hw);
        INIT_WORK(&hw->restart_work, sky2_restart);

        pci_set_drvdata(pdev, hw);
        pdev->d3_delay = 150;

        return 0;

err_out_unregister:
        if (hw->flags & SKY2_HW_USE_MSI)
                pci_disable_msi(pdev);
        unregister_netdev(dev);
err_out_free_netdev:
        free_netdev(dev);
err_out_free_pci:
        sky2_write8(hw, B0_CTST, CS_RST_SET);
        pci_free_consistent(pdev, STATUS_LE_BYTES, hw->st_le, hw->st_dma);
err_out_iounmap:
        iounmap(hw->regs);
err_out_free_hw:
        kfree(hw);
err_out_free_regions:
        pci_release_regions(pdev);
err_out_disable:
        pci_disable_device(pdev);
err_out:
        pci_set_drvdata(pdev, NULL);
        return err;
}

static void __devexit sky2_remove(struct pci_dev *pdev)
{
        struct sky2_hw *hw = pci_get_drvdata(pdev);
        int i;

        if (!hw)
                return;

        del_timer_sync(&hw->watchdog_timer);
        cancel_work_sync(&hw->restart_work);

        for (i = hw->ports-1; i >= 0; --i)
                unregister_netdev(hw->dev[i]);

        sky2_write32(hw, B0_IMSK, 0);

        sky2_power_aux(hw);

        sky2_write8(hw, B0_CTST, CS_RST_SET);
        sky2_read8(hw, B0_CTST);

        free_irq(pdev->irq, hw);
        if (hw->flags & SKY2_HW_USE_MSI)
                pci_disable_msi(pdev);
        pci_free_consistent(pdev, STATUS_LE_BYTES, hw->st_le, hw->st_dma);
        pci_release_regions(pdev);
        pci_disable_device(pdev);

        for (i = hw->ports-1; i >= 0; --i)
                free_netdev(hw->dev[i]);

        iounmap(hw->regs);
        kfree(hw);

        pci_set_drvdata(pdev, NULL);
}

static int sky2_suspend(struct pci_dev *pdev, pm_message_t state)
{
        struct sky2_hw *hw = pci_get_drvdata(pdev);
        int i, wol = 0;

        if (!hw)
                return 0;

        del_timer_sync(&hw->watchdog_timer);
        cancel_work_sync(&hw->restart_work);

        rtnl_lock();
        for (i = 0; i < hw->ports; i++) {
                struct net_device *dev = hw->dev[i];
                struct sky2_port *sky2 = netdev_priv(dev);

                sky2_detach(dev);

                if (sky2->wol)
                        sky2_wol_init(sky2);

                wol |= sky2->wol;
        }

        device_set_wakeup_enable(&pdev->dev, wol != 0);

        sky2_write32(hw, B0_IMSK, 0);
        napi_disable(&hw->napi);
        sky2_power_aux(hw);
        rtnl_unlock();

        pci_save_state(pdev);
        pci_enable_wake(pdev, pci_choose_state(pdev, state), wol);
        pci_set_power_state(pdev, pci_choose_state(pdev, state));

        return 0;
}

#ifdef CONFIG_PM
static int sky2_resume(struct pci_dev *pdev)
{
        struct sky2_hw *hw = pci_get_drvdata(pdev);
        int i, err;

        if (!hw)
                return 0;

        err = pci_set_power_state(pdev, PCI_D0);
        if (err)
                goto out;

        err = pci_restore_state(pdev);
        if (err)
                goto out;

        pci_enable_wake(pdev, PCI_D0, 0);

        /* Re-enable all clocks */
        err = pci_write_config_dword(pdev, PCI_DEV_REG3, 0);
        if (err) {
                dev_err(&pdev->dev, "PCI write config failed\n");
                goto out;
        }

        sky2_reset(hw);
        sky2_write32(hw, B0_IMSK, Y2_IS_BASE);
        napi_enable(&hw->napi);

        rtnl_lock();
        for (i = 0; i < hw->ports; i++) {
                err = sky2_reattach(hw->dev[i]);
                if (err)
                        goto out;
        }
        rtnl_unlock();

        return 0;
out:
        rtnl_unlock();

        dev_err(&pdev->dev, "resume failed (%d)\n", err);
        pci_disable_device(pdev);
        return err;
}
#endif

static void sky2_shutdown(struct pci_dev *pdev)
{
        sky2_suspend(pdev, PMSG_SUSPEND);
}

static struct pci_driver sky2_driver = {
        .name = DRV_NAME,
        .id_table = sky2_id_table,
        .probe = sky2_probe,
        .remove = __devexit_p(sky2_remove),
#ifdef CONFIG_PM
        .suspend = sky2_suspend,
        .resume = sky2_resume,
#endif
        .shutdown = sky2_shutdown,
};

static int __init sky2_init_module(void)
{
        pr_info(PFX "driver version " DRV_VERSION "\n");

        sky2_debug_init();
        return pci_register_driver(&sky2_driver);
}

static void __exit sky2_cleanup_module(void)
{
        pci_unregister_driver(&sky2_driver);
        sky2_debug_cleanup();
}

module_init(sky2_init_module);
module_exit(sky2_cleanup_module);

MODULE_DESCRIPTION("Marvell Yukon 2 Gigabit Ethernet driver");
MODULE_AUTHOR("Stephen Hemminger <shemminger@linux-foundation.org>");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);