// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * smc911x.c
 * This is a driver for SMSC's LAN911{5,6,7,8} single-chip Ethernet devices.
 *
 * Copyright (C) 2005 Sensoria Corp
 *         Derived from the unified SMC91x driver by Nicolas Pitre
 *         and the smsc911x.c reference driver by SMSC
 *
 * Arguments:
 *       watchdog  = TX watchdog timeout
 *       tx_fifo_kb = Size of TX FIFO in KB
 *
 * History:
 *        04/16/05      Dustin McIntire          Initial version
 */
static const char version[] =
         "smc911x.c: v1.0 04-16-2005 by Dustin McIntire <dustin@sensoria.com>\n";

/* Debugging options */
#define ENABLE_SMC_DEBUG_RX             0
#define ENABLE_SMC_DEBUG_TX             0
#define ENABLE_SMC_DEBUG_DMA            0
#define ENABLE_SMC_DEBUG_PKTS           0
#define ENABLE_SMC_DEBUG_MISC           0
#define ENABLE_SMC_DEBUG_FUNC           0

#define SMC_DEBUG_RX            ((ENABLE_SMC_DEBUG_RX   ? 1 : 0) << 0)
#define SMC_DEBUG_TX            ((ENABLE_SMC_DEBUG_TX   ? 1 : 0) << 1)
#define SMC_DEBUG_DMA           ((ENABLE_SMC_DEBUG_DMA  ? 1 : 0) << 2)
#define SMC_DEBUG_PKTS          ((ENABLE_SMC_DEBUG_PKTS ? 1 : 0) << 3)
#define SMC_DEBUG_MISC          ((ENABLE_SMC_DEBUG_MISC ? 1 : 0) << 4)
#define SMC_DEBUG_FUNC          ((ENABLE_SMC_DEBUG_FUNC ? 1 : 0) << 5)

#ifndef SMC_DEBUG
#define SMC_DEBUG        ( SMC_DEBUG_RX   | \
                           SMC_DEBUG_TX   | \
                           SMC_DEBUG_DMA  | \
                           SMC_DEBUG_PKTS | \
                           SMC_DEBUG_MISC | \
                           SMC_DEBUG_FUNC   \
                         )
#endif

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/crc32.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/workqueue.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>

#include <linux/dmaengine.h>

#include <asm/io.h>

#include "smc911x.h"

/*
 * Transmit timeout, default 5 seconds.
 */
static int watchdog = 5000;
module_param(watchdog, int, 0400);
MODULE_PARM_DESC(watchdog, "transmit timeout in milliseconds");

static int tx_fifo_kb=8;
module_param(tx_fifo_kb, int, 0400);
MODULE_PARM_DESC(tx_fifo_kb,"transmit FIFO size in KB (1<x<15)(default=8)");

MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:smc911x");

/*
 * The internal workings of the driver.  If you are changing anything
 * here with the SMC stuff, you should have the datasheet and know
 * what you are doing.
 */
#define CARDNAME "smc911x"

/*
 * Use power-down feature of the chip
 */
#define POWER_DOWN               1

#if SMC_DEBUG > 0
#define DBG(n, dev, args...)                     \
        do {                                     \
                if (SMC_DEBUG & (n))             \
                        netdev_dbg(dev, args);   \
        } while (0)

#define PRINTK(dev, args...)   netdev_info(dev, args)
#else
#define DBG(n, dev, args...)                     \
        while (0) {                              \
                netdev_dbg(dev, args);           \
        }
#define PRINTK(dev, args...)   netdev_dbg(dev, args)
#endif

#if SMC_DEBUG_PKTS > 0
static void PRINT_PKT(u_char *buf, int length)
{
        int i;
        int remainder;
        int lines;

        lines = length / 16;
        remainder = length % 16;

        for (i = 0; i < lines ; i ++) {
                int cur;
                printk(KERN_DEBUG);
                for (cur = 0; cur < 8; cur++) {
                        u_char a, b;
                        a = *buf++;
                        b = *buf++;
                        pr_cont("%02x%02x ", a, b);
                }
                pr_cont("\n");
        }
        printk(KERN_DEBUG);
        for (i = 0; i < remainder/2 ; i++) {
                u_char a, b;
                a = *buf++;
                b = *buf++;
                pr_cont("%02x%02x ", a, b);
        }
        pr_cont("\n");
}
#else
#define PRINT_PKT(x...)  do { } while (0)
#endif


/* this enables an interrupt in the interrupt mask register */
#define SMC_ENABLE_INT(lp, x) do {                      \
        unsigned int  __mask;                           \
        __mask = SMC_GET_INT_EN((lp));                  \
        __mask |= (x);                                  \
        SMC_SET_INT_EN((lp), __mask);                   \
} while (0)

/* this disables an interrupt from the interrupt mask register */
#define SMC_DISABLE_INT(lp, x) do {                     \
        unsigned int  __mask;                           \
        __mask = SMC_GET_INT_EN((lp));                  \
        __mask &= ~(x);                                 \
        SMC_SET_INT_EN((lp), __mask);                   \
} while (0)

/*
 * this does a soft reset on the device
 */
static void smc911x_reset(struct net_device *dev)
{
        struct smc911x_local *lp = netdev_priv(dev);
        unsigned int reg, timeout=0, resets=1, irq_cfg;
        unsigned long flags;

        DBG(SMC_DEBUG_FUNC, dev, "--> %s\n", __func__);

        /*       Take out of PM setting first */
        if ((SMC_GET_PMT_CTRL(lp) & PMT_CTRL_READY_) == 0) {
                /* Write to the bytetest will take out of powerdown */
                SMC_SET_BYTE_TEST(lp, 0);
                timeout=10;
                do {
                        udelay(10);
                        reg = SMC_GET_PMT_CTRL(lp) & PMT_CTRL_READY_;
                } while (--timeout && !reg);
                if (timeout == 0) {
                        PRINTK(dev, "smc911x_reset timeout waiting for PM restore\n");
                        return;
                }
        }

        /* Disable all interrupts */
        spin_lock_irqsave(&lp->lock, flags);
        SMC_SET_INT_EN(lp, 0);
        spin_unlock_irqrestore(&lp->lock, flags);

        while (resets--) {
                SMC_SET_HW_CFG(lp, HW_CFG_SRST_);
                timeout=10;
                do {
                        udelay(10);
                        reg = SMC_GET_HW_CFG(lp);
                        /* If chip indicates reset timeout then try again */
                        if (reg & HW_CFG_SRST_TO_) {
                                PRINTK(dev, "chip reset timeout, retrying...\n");
                                resets++;
                                break;
                        }
                } while (--timeout && (reg & HW_CFG_SRST_));
        }
        if (timeout == 0) {
                PRINTK(dev, "smc911x_reset timeout waiting for reset\n");
                return;
        }

        /* make sure EEPROM has finished loading before setting GPIO_CFG */
        timeout=1000;
        while (--timeout && (SMC_GET_E2P_CMD(lp) & E2P_CMD_EPC_BUSY_))
                udelay(10);

        if (timeout == 0){
                PRINTK(dev, "smc911x_reset timeout waiting for EEPROM busy\n");
                return;
        }

        /* Initialize interrupts */
        SMC_SET_INT_EN(lp, 0);
        SMC_ACK_INT(lp, -1);

        /* Reset the FIFO level and flow control settings */
        SMC_SET_HW_CFG(lp, (lp->tx_fifo_kb & 0xF) << 16);
//TODO: Figure out what appropriate pause time is
        SMC_SET_FLOW(lp, FLOW_FCPT_ | FLOW_FCEN_);
        SMC_SET_AFC_CFG(lp, lp->afc_cfg);


        /* Set to LED outputs */
        SMC_SET_GPIO_CFG(lp, 0x70070000);

        /*
         * Deassert IRQ for 1*10us for edge type interrupts
         * and drive IRQ pin push-pull
         */
        irq_cfg = (1 << 24) | INT_CFG_IRQ_EN_ | INT_CFG_IRQ_TYPE_;
#ifdef SMC_DYNAMIC_BUS_CONFIG
        if (lp->cfg.irq_polarity)
                irq_cfg |= INT_CFG_IRQ_POL_;
#endif
        SMC_SET_IRQ_CFG(lp, irq_cfg);

        /* clear anything saved */
        if (lp->pending_tx_skb != NULL) {
                dev_kfree_skb (lp->pending_tx_skb);
                lp->pending_tx_skb = NULL;
                dev->stats.tx_errors++;
                dev->stats.tx_aborted_errors++;
        }
}

/*
 * Enable Interrupts, Receive, and Transmit
 */
static void smc911x_enable(struct net_device *dev)
{
        struct smc911x_local *lp = netdev_priv(dev);
        unsigned mask, cfg, cr;
        unsigned long flags;

        DBG(SMC_DEBUG_FUNC, dev, "--> %s\n", __func__);

        spin_lock_irqsave(&lp->lock, flags);

        SMC_SET_MAC_ADDR(lp, dev->dev_addr);

        /* Enable TX */
        cfg = SMC_GET_HW_CFG(lp);
        cfg &= HW_CFG_TX_FIF_SZ_ | 0xFFF;
        cfg |= HW_CFG_SF_;
        SMC_SET_HW_CFG(lp, cfg);
        SMC_SET_FIFO_TDA(lp, 0xFF);
        /* Update TX stats on every 64 packets received or every 1 sec */
        SMC_SET_FIFO_TSL(lp, 64);
        SMC_SET_GPT_CFG(lp, GPT_CFG_TIMER_EN_ | 10000);

        SMC_GET_MAC_CR(lp, cr);
        cr |= MAC_CR_TXEN_ | MAC_CR_HBDIS_;
        SMC_SET_MAC_CR(lp, cr);
        SMC_SET_TX_CFG(lp, TX_CFG_TX_ON_);

        /* Add 2 byte padding to start of packets */
        SMC_SET_RX_CFG(lp, (2<<8) & RX_CFG_RXDOFF_);

        /* Turn on receiver and enable RX */
        if (cr & MAC_CR_RXEN_)
                DBG(SMC_DEBUG_RX, dev, "Receiver already enabled\n");

        SMC_SET_MAC_CR(lp, cr | MAC_CR_RXEN_);

        /* Interrupt on every received packet */
        SMC_SET_FIFO_RSA(lp, 0x01);
        SMC_SET_FIFO_RSL(lp, 0x00);

        /* now, enable interrupts */
        mask = INT_EN_TDFA_EN_ | INT_EN_TSFL_EN_ | INT_EN_RSFL_EN_ |
                INT_EN_GPT_INT_EN_ | INT_EN_RXDFH_INT_EN_ | INT_EN_RXE_EN_ |
                INT_EN_PHY_INT_EN_;
        if (IS_REV_A(lp->revision))
                mask|=INT_EN_RDFL_EN_;
        else {
                mask|=INT_EN_RDFO_EN_;
        }
        SMC_ENABLE_INT(lp, mask);

        spin_unlock_irqrestore(&lp->lock, flags);
}

/*
 * this puts the device in an inactive state
 */
static void smc911x_shutdown(struct net_device *dev)
{
        struct smc911x_local *lp = netdev_priv(dev);
        unsigned cr;
        unsigned long flags;

        DBG(SMC_DEBUG_FUNC, dev, "%s: --> %s\n", CARDNAME, __func__);

        /* Disable IRQ's */
        SMC_SET_INT_EN(lp, 0);

        /* Turn of Rx and TX */
        spin_lock_irqsave(&lp->lock, flags);
        SMC_GET_MAC_CR(lp, cr);
        cr &= ~(MAC_CR_TXEN_ | MAC_CR_RXEN_ | MAC_CR_HBDIS_);
        SMC_SET_MAC_CR(lp, cr);
        SMC_SET_TX_CFG(lp, TX_CFG_STOP_TX_);
        spin_unlock_irqrestore(&lp->lock, flags);
}

static inline void smc911x_drop_pkt(struct net_device *dev)
{
        struct smc911x_local *lp = netdev_priv(dev);
        unsigned int fifo_count, timeout, reg;

        DBG(SMC_DEBUG_FUNC | SMC_DEBUG_RX, dev, "%s: --> %s\n",
            CARDNAME, __func__);
        fifo_count = SMC_GET_RX_FIFO_INF(lp) & 0xFFFF;
        if (fifo_count <= 4) {
                /* Manually dump the packet data */
                while (fifo_count--)
                        SMC_GET_RX_FIFO(lp);
        } else   {
                /* Fast forward through the bad packet */
                SMC_SET_RX_DP_CTRL(lp, RX_DP_CTRL_FFWD_BUSY_);
                timeout=50;
                do {
                        udelay(10);
                        reg = SMC_GET_RX_DP_CTRL(lp) & RX_DP_CTRL_FFWD_BUSY_;
                } while (--timeout && reg);
                if (timeout == 0) {
                        PRINTK(dev, "timeout waiting for RX fast forward\n");
                }
        }
}

/*
 * This is the procedure to handle the receipt of a packet.
 * It should be called after checking for packet presence in
 * the RX status FIFO.   It must be called with the spin lock
 * already held.
 */
static inline void       smc911x_rcv(struct net_device *dev)
{
        struct smc911x_local *lp = netdev_priv(dev);
        unsigned int pkt_len, status;
        struct sk_buff *skb;
        unsigned char *data;

        DBG(SMC_DEBUG_FUNC | SMC_DEBUG_RX, dev, "--> %s\n",
            __func__);
        status = SMC_GET_RX_STS_FIFO(lp);
        DBG(SMC_DEBUG_RX, dev, "Rx pkt len %d status 0x%08x\n",
            (status & 0x3fff0000) >> 16, status & 0xc000ffff);
        pkt_len = (status & RX_STS_PKT_LEN_) >> 16;
        if (status & RX_STS_ES_) {
                /* Deal with a bad packet */
                dev->stats.rx_errors++;
                if (status & RX_STS_CRC_ERR_)
                        dev->stats.rx_crc_errors++;
                else {
                        if (status & RX_STS_LEN_ERR_)
                                dev->stats.rx_length_errors++;
                        if (status & RX_STS_MCAST_)
                                dev->stats.multicast++;
                }
                /* Remove the bad packet data from the RX FIFO */
                smc911x_drop_pkt(dev);
        } else {
                /* Receive a valid packet */
                /* Alloc a buffer with extra room for DMA alignment */
                skb = netdev_alloc_skb(dev, pkt_len+32);
                if (unlikely(skb == NULL)) {
                        PRINTK(dev, "Low memory, rcvd packet dropped.\n");
                        dev->stats.rx_dropped++;
                        smc911x_drop_pkt(dev);
                        return;
                }
                /* Align IP header to 32 bits
                 * Note that the device is configured to add a 2
                 * byte padding to the packet start, so we really
                 * want to write to the orignal data pointer */
                data = skb->data;
                skb_reserve(skb, 2);
                skb_put(skb,pkt_len-4);
#ifdef SMC_USE_DMA
                {
                unsigned int fifo;
                /* Lower the FIFO threshold if possible */
                fifo = SMC_GET_FIFO_INT(lp);
                if (fifo & 0xFF) fifo--;
                DBG(SMC_DEBUG_RX, dev, "Setting RX stat FIFO threshold to %d\n",
                    fifo & 0xff);
                SMC_SET_FIFO_INT(lp, fifo);
                /* Setup RX DMA */
                SMC_SET_RX_CFG(lp, RX_CFG_RX_END_ALGN16_ | ((2<<8) & RX_CFG_RXDOFF_));
                lp->rxdma_active = 1;
                lp->current_rx_skb = skb;
                SMC_PULL_DATA(lp, data, (pkt_len+2+15) & ~15);
                /* Packet processing deferred to DMA RX interrupt */
                }
#else
                SMC_SET_RX_CFG(lp, RX_CFG_RX_END_ALGN4_ | ((2<<8) & RX_CFG_RXDOFF_));
                SMC_PULL_DATA(lp, data, pkt_len+2+3);

                DBG(SMC_DEBUG_PKTS, dev, "Received packet\n");
                PRINT_PKT(data, ((pkt_len - 4) <= 64) ? pkt_len - 4 : 64);
                skb->protocol = eth_type_trans(skb, dev);
                netif_rx(skb);
                dev->stats.rx_packets++;
                dev->stats.rx_bytes += pkt_len-4;
#endif
        }
}

/*
 * This is called to actually send a packet to the chip.
 */
static void smc911x_hardware_send_pkt(struct net_device *dev)
{
        struct smc911x_local *lp = netdev_priv(dev);
        struct sk_buff *skb;
        unsigned int cmdA, cmdB, len;
        unsigned char *buf;

        DBG(SMC_DEBUG_FUNC | SMC_DEBUG_TX, dev, "--> %s\n", __func__);
        BUG_ON(lp->pending_tx_skb == NULL);

        skb = lp->pending_tx_skb;
        lp->pending_tx_skb = NULL;

        /* cmdA {25:24] data alignment [20:16] start offset [10:0] buffer length */
        /* cmdB {31:16] pkt tag [10:0] length */
#ifdef SMC_USE_DMA
        /* 16 byte buffer alignment mode */
        buf = (char*)((u32)(skb->data) & ~0xF);
        len = (skb->len + 0xF + ((u32)skb->data & 0xF)) & ~0xF;
        cmdA = (1<<24) | (((u32)skb->data & 0xF)<<16) |
                        TX_CMD_A_INT_FIRST_SEG_ | TX_CMD_A_INT_LAST_SEG_ |
                        skb->len;
#else
        buf = (char *)((uintptr_t)skb->data & ~0x3);
        len = (skb->len + 3 + ((uintptr_t)skb->data & 3)) & ~0x3;
        cmdA = (((uintptr_t)skb->data & 0x3) << 16) |
                        TX_CMD_A_INT_FIRST_SEG_ | TX_CMD_A_INT_LAST_SEG_ |
                        skb->len;
#endif
        /* tag is packet length so we can use this in stats update later */
        cmdB = (skb->len  << 16) | (skb->len & 0x7FF);

        DBG(SMC_DEBUG_TX, dev, "TX PKT LENGTH 0x%04x (%d) BUF 0x%p CMDA 0x%08x CMDB 0x%08x\n",
            len, len, buf, cmdA, cmdB);
        SMC_SET_TX_FIFO(lp, cmdA);
        SMC_SET_TX_FIFO(lp, cmdB);

        DBG(SMC_DEBUG_PKTS, dev, "Transmitted packet\n");
        PRINT_PKT(buf, len <= 64 ? len : 64);

        /* Send pkt via PIO or DMA */
#ifdef SMC_USE_DMA
        lp->current_tx_skb = skb;
        SMC_PUSH_DATA(lp, buf, len);
        /* DMA complete IRQ will free buffer and set jiffies */
#else
        SMC_PUSH_DATA(lp, buf, len);
        netif_trans_update(dev);
        dev_kfree_skb_irq(skb);
#endif
        if (!lp->tx_throttle) {
                netif_wake_queue(dev);
        }
        SMC_ENABLE_INT(lp, INT_EN_TDFA_EN_ | INT_EN_TSFL_EN_);
}

/*
 * Since I am not sure if I will have enough room in the chip's ram
 * to store the packet, I call this routine which either sends it
 * now, or set the card to generates an interrupt when ready
 * for the packet.
 */
static netdev_tx_t
smc911x_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
        struct smc911x_local *lp = netdev_priv(dev);
        unsigned int free;
        unsigned long flags;

        DBG(SMC_DEBUG_FUNC | SMC_DEBUG_TX, dev, "--> %s\n",
            __func__);

        spin_lock_irqsave(&lp->lock, flags);

        BUG_ON(lp->pending_tx_skb != NULL);

        free = SMC_GET_TX_FIFO_INF(lp) & TX_FIFO_INF_TDFREE_;
        DBG(SMC_DEBUG_TX, dev, "TX free space %d\n", free);

        /* Turn off the flow when running out of space in FIFO */
        if (free <= SMC911X_TX_FIFO_LOW_THRESHOLD) {
                DBG(SMC_DEBUG_TX, dev, "Disabling data flow due to low FIFO space (%d)\n",
                    free);
                /* Reenable when at least 1 packet of size MTU present */
                SMC_SET_FIFO_TDA(lp, (SMC911X_TX_FIFO_LOW_THRESHOLD)/64);
                lp->tx_throttle = 1;
                netif_stop_queue(dev);
        }

        /* Drop packets when we run out of space in TX FIFO
         * Account for overhead required for:
         *
         *        Tx command words                       8 bytes
         *        Start offset                           15 bytes
         *        End padding                            15 bytes
         */
        if (unlikely(free < (skb->len + 8 + 15 + 15))) {
                netdev_warn(dev, "No Tx free space %d < %d\n",
                            free, skb->len);
                lp->pending_tx_skb = NULL;
                dev->stats.tx_errors++;
                dev->stats.tx_dropped++;
                spin_unlock_irqrestore(&lp->lock, flags);
                dev_kfree_skb_any(skb);
                return NETDEV_TX_OK;
        }

#ifdef SMC_USE_DMA
        {
                /* If the DMA is already running then defer this packet Tx until
                 * the DMA IRQ starts it
                 */
                if (lp->txdma_active) {
                        DBG(SMC_DEBUG_TX | SMC_DEBUG_DMA, dev, "Tx DMA running, deferring packet\n");
                        lp->pending_tx_skb = skb;
                        netif_stop_queue(dev);
                        spin_unlock_irqrestore(&lp->lock, flags);
                        return NETDEV_TX_OK;
                } else {
                        DBG(SMC_DEBUG_TX | SMC_DEBUG_DMA, dev, "Activating Tx DMA\n");
                        lp->txdma_active = 1;
                }
        }
#endif
        lp->pending_tx_skb = skb;
        smc911x_hardware_send_pkt(dev);
        spin_unlock_irqrestore(&lp->lock, flags);

        return NETDEV_TX_OK;
}

/*
 * This handles a TX status interrupt, which is only called when:
 * - a TX error occurred, or
 * - TX of a packet completed.
 */
static void smc911x_tx(struct net_device *dev)
{
        struct smc911x_local *lp = netdev_priv(dev);
        unsigned int tx_status;

        DBG(SMC_DEBUG_FUNC | SMC_DEBUG_TX, dev, "--> %s\n",
            __func__);

        /* Collect the TX status */
        while (((SMC_GET_TX_FIFO_INF(lp) & TX_FIFO_INF_TSUSED_) >> 16) != 0) {
                DBG(SMC_DEBUG_TX, dev, "Tx stat FIFO used 0x%04x\n",
                    (SMC_GET_TX_FIFO_INF(lp) & TX_FIFO_INF_TSUSED_) >> 16);
                tx_status = SMC_GET_TX_STS_FIFO(lp);
                dev->stats.tx_packets++;
                dev->stats.tx_bytes+=tx_status>>16;
                DBG(SMC_DEBUG_TX, dev, "Tx FIFO tag 0x%04x status 0x%04x\n",
                    (tx_status & 0xffff0000) >> 16,
                    tx_status & 0x0000ffff);
                /* count Tx errors, but ignore lost carrier errors when in
                 * full-duplex mode */
                if ((tx_status & TX_STS_ES_) && !(lp->ctl_rfduplx &&
                    !(tx_status & 0x00000306))) {
                        dev->stats.tx_errors++;
                }
                if (tx_status & TX_STS_MANY_COLL_) {
                        dev->stats.collisions+=16;
                        dev->stats.tx_aborted_errors++;
                } else {
                        dev->stats.collisions+=(tx_status & TX_STS_COLL_CNT_) >> 3;
                }
                /* carrier error only has meaning for half-duplex communication */
                if ((tx_status & (TX_STS_LOC_ | TX_STS_NO_CARR_)) &&
                    !lp->ctl_rfduplx) {
                        dev->stats.tx_carrier_errors++;
                }
                if (tx_status & TX_STS_LATE_COLL_) {
                        dev->stats.collisions++;
                        dev->stats.tx_aborted_errors++;
                }
        }
}


/*---PHY CONTROL AND CONFIGURATION-----------------------------------------*/
/*
 * Reads a register from the MII Management serial interface
 */

static int smc911x_phy_read(struct net_device *dev, int phyaddr, int phyreg)
{
        struct smc911x_local *lp = netdev_priv(dev);
        unsigned int phydata;

        SMC_GET_MII(lp, phyreg, phyaddr, phydata);

        DBG(SMC_DEBUG_MISC, dev, "%s: phyaddr=0x%x, phyreg=0x%02x, phydata=0x%04x\n",
            __func__, phyaddr, phyreg, phydata);
        return phydata;
}


/*
 * Writes a register to the MII Management serial interface
 */
static void smc911x_phy_write(struct net_device *dev, int phyaddr, int phyreg,
                        int phydata)
{
        struct smc911x_local *lp = netdev_priv(dev);

        DBG(SMC_DEBUG_MISC, dev, "%s: phyaddr=0x%x, phyreg=0x%x, phydata=0x%x\n",
            __func__, phyaddr, phyreg, phydata);

        SMC_SET_MII(lp, phyreg, phyaddr, phydata);
}

/*
 * Finds and reports the PHY address (115 and 117 have external
 * PHY interface 118 has internal only
 */
static void smc911x_phy_detect(struct net_device *dev)
{
        struct smc911x_local *lp = netdev_priv(dev);
        int phyaddr;
        unsigned int cfg, id1, id2;

        DBG(SMC_DEBUG_FUNC, dev, "--> %s\n", __func__);

        lp->phy_type = 0;

        /*
         * Scan all 32 PHY addresses if necessary, starting at
         * PHY#1 to PHY#31, and then PHY#0 last.
         */
        switch(lp->version) {
                case CHIP_9115:
                case CHIP_9117:
                case CHIP_9215:
                case CHIP_9217:
                        cfg = SMC_GET_HW_CFG(lp);
                        if (cfg & HW_CFG_EXT_PHY_DET_) {
                                cfg &= ~HW_CFG_PHY_CLK_SEL_;
                                cfg |= HW_CFG_PHY_CLK_SEL_CLK_DIS_;
                                SMC_SET_HW_CFG(lp, cfg);
                                udelay(10); /* Wait for clocks to stop */

                                cfg |= HW_CFG_EXT_PHY_EN_;
                                SMC_SET_HW_CFG(lp, cfg);
                                udelay(10); /* Wait for clocks to stop */

                                cfg &= ~HW_CFG_PHY_CLK_SEL_;
                                cfg |= HW_CFG_PHY_CLK_SEL_EXT_PHY_;
                                SMC_SET_HW_CFG(lp, cfg);
                                udelay(10); /* Wait for clocks to stop */

                                cfg |= HW_CFG_SMI_SEL_;
                                SMC_SET_HW_CFG(lp, cfg);

                                for (phyaddr = 1; phyaddr < 32; ++phyaddr) {

                                        /* Read the PHY identifiers */
                                        SMC_GET_PHY_ID1(lp, phyaddr & 31, id1);
                                        SMC_GET_PHY_ID2(lp, phyaddr & 31, id2);

                                        /* Make sure it is a valid identifier */
                                        if (id1 != 0x0000 && id1 != 0xffff &&
                                            id1 != 0x8000 && id2 != 0x0000 &&
                                            id2 != 0xffff && id2 != 0x8000) {
                                                /* Save the PHY's address */
                                                lp->mii.phy_id = phyaddr & 31;
                                                lp->phy_type = id1 << 16 | id2;
                                                break;
                                        }
                                }
                                if (phyaddr < 32)
                                        /* Found an external PHY */
                                        break;
                        }
                        fallthrough;
                default:
                        /* Internal media only */
                        SMC_GET_PHY_ID1(lp, 1, id1);
                        SMC_GET_PHY_ID2(lp, 1, id2);
                        /* Save the PHY's address */
                        lp->mii.phy_id = 1;
                        lp->phy_type = id1 << 16 | id2;
        }

        DBG(SMC_DEBUG_MISC, dev, "phy_id1=0x%x, phy_id2=0x%x phyaddr=0x%x\n",
            id1, id2, lp->mii.phy_id);
}

/*
 * Sets the PHY to a configuration as determined by the user.
 * Called with spin_lock held.
 */
static int smc911x_phy_fixed(struct net_device *dev)
{
        struct smc911x_local *lp = netdev_priv(dev);
        int phyaddr = lp->mii.phy_id;
        int bmcr;

        DBG(SMC_DEBUG_FUNC, dev, "--> %s\n", __func__);

        /* Enter Link Disable state */
        SMC_GET_PHY_BMCR(lp, phyaddr, bmcr);
        bmcr |= BMCR_PDOWN;
        SMC_SET_PHY_BMCR(lp, phyaddr, bmcr);

        /*
         * Set our fixed capabilities
         * Disable auto-negotiation
         */
        bmcr &= ~BMCR_ANENABLE;
        if (lp->ctl_rfduplx)
                bmcr |= BMCR_FULLDPLX;

        if (lp->ctl_rspeed == 100)
                bmcr |= BMCR_SPEED100;

        /* Write our capabilities to the phy control register */
        SMC_SET_PHY_BMCR(lp, phyaddr, bmcr);

        /* Re-Configure the Receive/Phy Control register */
        bmcr &= ~BMCR_PDOWN;
        SMC_SET_PHY_BMCR(lp, phyaddr, bmcr);

        return 1;
}

/**
 * smc911x_phy_reset - reset the phy
 * @dev: net device
 * @phy: phy address
 *
 * Issue a software reset for the specified PHY and
 * wait up to 100ms for the reset to complete.   We should
 * not access the PHY for 50ms after issuing the reset.
 *
 * The time to wait appears to be dependent on the PHY.
 *
 */
static int smc911x_phy_reset(struct net_device *dev, int phy)
{
        struct smc911x_local *lp = netdev_priv(dev);
        int timeout;
        unsigned long flags;
        unsigned int reg;

        DBG(SMC_DEBUG_FUNC, dev, "--> %s()\n", __func__);

        spin_lock_irqsave(&lp->lock, flags);
        reg = SMC_GET_PMT_CTRL(lp);
        reg &= ~0xfffff030;
        reg |= PMT_CTRL_PHY_RST_;
        SMC_SET_PMT_CTRL(lp, reg);
        spin_unlock_irqrestore(&lp->lock, flags);
        for (timeout = 2; timeout; timeout--) {
                msleep(50);
                spin_lock_irqsave(&lp->lock, flags);
                reg = SMC_GET_PMT_CTRL(lp);
                spin_unlock_irqrestore(&lp->lock, flags);
                if (!(reg & PMT_CTRL_PHY_RST_)) {
                        /* extra delay required because the phy may
                         * not be completed with its reset
                         * when PHY_BCR_RESET_ is cleared. 256us
                         * should suffice, but use 500us to be safe
                         */
                        udelay(500);
                break;
                }
        }

        return reg & PMT_CTRL_PHY_RST_;
}

/**
 * smc911x_phy_powerdown - powerdown phy
 * @dev: net device
 * @phy: phy address
 *
 * Power down the specified PHY
 */
static void smc911x_phy_powerdown(struct net_device *dev, int phy)
{
        struct smc911x_local *lp = netdev_priv(dev);
        unsigned int bmcr;

        /* Enter Link Disable state */
        SMC_GET_PHY_BMCR(lp, phy, bmcr);
        bmcr |= BMCR_PDOWN;
        SMC_SET_PHY_BMCR(lp, phy, bmcr);
}

/**
 * smc911x_phy_check_media - check the media status and adjust BMCR
 * @dev: net device
 * @init: set true for initialisation
 *
 * Select duplex mode depending on negotiation state.   This
 * also updates our carrier state.
 */
static void smc911x_phy_check_media(struct net_device *dev, int init)
{
        struct smc911x_local *lp = netdev_priv(dev);
        int phyaddr = lp->mii.phy_id;
        unsigned int bmcr, cr;

        DBG(SMC_DEBUG_FUNC, dev, "--> %s\n", __func__);

        if (mii_check_media(&lp->mii, netif_msg_link(lp), init)) {
                /* duplex state has changed */
                SMC_GET_PHY_BMCR(lp, phyaddr, bmcr);
                SMC_GET_MAC_CR(lp, cr);
                if (lp->mii.full_duplex) {
                        DBG(SMC_DEBUG_MISC, dev, "Configuring for full-duplex mode\n");
                        bmcr |= BMCR_FULLDPLX;
                        cr |= MAC_CR_RCVOWN_;
                } else {
                        DBG(SMC_DEBUG_MISC, dev, "Configuring for half-duplex mode\n");
                        bmcr &= ~BMCR_FULLDPLX;
                        cr &= ~MAC_CR_RCVOWN_;
                }
                SMC_SET_PHY_BMCR(lp, phyaddr, bmcr);
                SMC_SET_MAC_CR(lp, cr);
        }
}

/*
 * Configures the specified PHY through the MII management interface
 * using Autonegotiation.
 * Calls smc911x_phy_fixed() if the user has requested a certain config.
 * If RPC ANEG bit is set, the media selection is dependent purely on
 * the selection by the MII (either in the MII BMCR reg or the result
 * of autonegotiation.)  If the RPC ANEG bit is cleared, the selection
 * is controlled by the RPC SPEED and RPC DPLX bits.
 */
static void smc911x_phy_configure(struct work_struct *work)
{
        struct smc911x_local *lp = container_of(work, struct smc911x_local,
                                                phy_configure);
        struct net_device *dev = lp->netdev;
        int phyaddr = lp->mii.phy_id;
        int my_phy_caps; /* My PHY capabilities */
        int my_ad_caps; /* My Advertised capabilities */
        int status __always_unused;
        unsigned long flags;

        DBG(SMC_DEBUG_FUNC, dev, "--> %s()\n", __func__);

        /*
         * We should not be called if phy_type is zero.
         */
        if (lp->phy_type == 0)
                return;

        if (smc911x_phy_reset(dev, phyaddr)) {
                netdev_info(dev, "PHY reset timed out\n");
                return;
        }
        spin_lock_irqsave(&lp->lock, flags);

        /*
         * Enable PHY Interrupts (for register 18)
         * Interrupts listed here are enabled
         */
        SMC_SET_PHY_INT_MASK(lp, phyaddr, PHY_INT_MASK_ENERGY_ON_ |
                 PHY_INT_MASK_ANEG_COMP_ | PHY_INT_MASK_REMOTE_FAULT_ |
                 PHY_INT_MASK_LINK_DOWN_);

        /* If the user requested no auto neg, then go set his request */
        if (lp->mii.force_media) {
                smc911x_phy_fixed(dev);
                goto smc911x_phy_configure_exit;
        }

        /* Copy our capabilities from MII_BMSR to MII_ADVERTISE */
        SMC_GET_PHY_BMSR(lp, phyaddr, my_phy_caps);
        if (!(my_phy_caps & BMSR_ANEGCAPABLE)) {
                netdev_info(dev, "Auto negotiation NOT supported\n");
                smc911x_phy_fixed(dev);
                goto smc911x_phy_configure_exit;
        }

        /* CSMA capable w/ both pauses */
        my_ad_caps = ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM;

        if (my_phy_caps & BMSR_100BASE4)
                my_ad_caps |= ADVERTISE_100BASE4;
        if (my_phy_caps & BMSR_100FULL)
                my_ad_caps |= ADVERTISE_100FULL;
        if (my_phy_caps & BMSR_100HALF)
                my_ad_caps |= ADVERTISE_100HALF;
        if (my_phy_caps & BMSR_10FULL)
                my_ad_caps |= ADVERTISE_10FULL;
        if (my_phy_caps & BMSR_10HALF)
                my_ad_caps |= ADVERTISE_10HALF;

        /* Disable capabilities not selected by our user */
        if (lp->ctl_rspeed != 100)
                my_ad_caps &= ~(ADVERTISE_100BASE4|ADVERTISE_100FULL|ADVERTISE_100HALF);

        if (!lp->ctl_rfduplx)
                my_ad_caps &= ~(ADVERTISE_100FULL|ADVERTISE_10FULL);

        /* Update our Auto-Neg Advertisement Register */
        SMC_SET_PHY_MII_ADV(lp, phyaddr, my_ad_caps);
        lp->mii.advertising = my_ad_caps;

        /*
         * Read the register back.       Without this, it appears that when
         * auto-negotiation is restarted, sometimes it isn't ready and
         * the link does not come up.
         */
        udelay(10);
        SMC_GET_PHY_MII_ADV(lp, phyaddr, status);

        DBG(SMC_DEBUG_MISC, dev, "phy caps=0x%04x\n", my_phy_caps);
        DBG(SMC_DEBUG_MISC, dev, "phy advertised caps=0x%04x\n", my_ad_caps);

        /* Restart auto-negotiation process in order to advertise my caps */
        SMC_SET_PHY_BMCR(lp, phyaddr, BMCR_ANENABLE | BMCR_ANRESTART);

        smc911x_phy_check_media(dev, 1);

smc911x_phy_configure_exit:
        spin_unlock_irqrestore(&lp->lock, flags);
}

/*
 * smc911x_phy_interrupt
 *
 * Purpose:  Handle interrupts relating to PHY register 18. This is
 *       called from the "hard" interrupt handler under our private spinlock.
 */
static void smc911x_phy_interrupt(struct net_device *dev)
{
        struct smc911x_local *lp = netdev_priv(dev);
        int phyaddr = lp->mii.phy_id;
        int status __always_unused;

        DBG(SMC_DEBUG_FUNC, dev, "--> %s\n", __func__);

        if (lp->phy_type == 0)
                return;

        smc911x_phy_check_media(dev, 0);
        /* read to clear status bits */
        SMC_GET_PHY_INT_SRC(lp, phyaddr,status);
        DBG(SMC_DEBUG_MISC, dev, "PHY interrupt status 0x%04x\n",
            status & 0xffff);
        DBG(SMC_DEBUG_MISC, dev, "AFC_CFG 0x%08x\n",
            SMC_GET_AFC_CFG(lp));
}

/*--- END PHY CONTROL AND CONFIGURATION-------------------------------------*/

/*
 * This is the main routine of the driver, to handle the device when
 * it needs some attention.
 */

static irqreturn_t smc911x_interrupt(int irq, void *dev_id)
{
        struct net_device *dev = dev_id;
        struct smc911x_local *lp = netdev_priv(dev);
        unsigned int status, mask, timeout;
        unsigned int rx_overrun=0, cr, pkts;
        unsigned long flags;

        DBG(SMC_DEBUG_FUNC, dev, "--> %s\n", __func__);

        spin_lock_irqsave(&lp->lock, flags);

        /* Spurious interrupt check */
        if ((SMC_GET_IRQ_CFG(lp) & (INT_CFG_IRQ_INT_ | INT_CFG_IRQ_EN_)) !=
                (INT_CFG_IRQ_INT_ | INT_CFG_IRQ_EN_)) {
                spin_unlock_irqrestore(&lp->lock, flags);
                return IRQ_NONE;
        }

        mask = SMC_GET_INT_EN(lp);
        SMC_SET_INT_EN(lp, 0);

        /* set a timeout value, so I don't stay here forever */
        timeout = 8;


        do {
                status = SMC_GET_INT(lp);

                DBG(SMC_DEBUG_MISC, dev, "INT 0x%08x MASK 0x%08x OUTSIDE MASK 0x%08x\n",
                    status, mask, status & ~mask);

                status &= mask;
                if (!status)
                        break;

                /* Handle SW interrupt condition */
                if (status & INT_STS_SW_INT_) {
                        SMC_ACK_INT(lp, INT_STS_SW_INT_);
                        mask &= ~INT_EN_SW_INT_EN_;
                }
                /* Handle various error conditions */
                if (status & INT_STS_RXE_) {
                        SMC_ACK_INT(lp, INT_STS_RXE_);
                        dev->stats.rx_errors++;
                }
                if (status & INT_STS_RXDFH_INT_) {
                        SMC_ACK_INT(lp, INT_STS_RXDFH_INT_);
                        dev->stats.rx_dropped+=SMC_GET_RX_DROP(lp);
                 }
                /* Undocumented interrupt-what is the right thing to do here? */
                if (status & INT_STS_RXDF_INT_) {
                        SMC_ACK_INT(lp, INT_STS_RXDF_INT_);
                }

                /* Rx Data FIFO exceeds set level */
                if (status & INT_STS_RDFL_) {
                        if (IS_REV_A(lp->revision)) {
                                rx_overrun=1;
                                SMC_GET_MAC_CR(lp, cr);
                                cr &= ~MAC_CR_RXEN_;
                                SMC_SET_MAC_CR(lp, cr);
                                DBG(SMC_DEBUG_RX, dev, "RX overrun\n");
                                dev->stats.rx_errors++;
                                dev->stats.rx_fifo_errors++;
                        }
                        SMC_ACK_INT(lp, INT_STS_RDFL_);
                }
                if (status & INT_STS_RDFO_) {
                        if (!IS_REV_A(lp->revision)) {
                                SMC_GET_MAC_CR(lp, cr);
                                cr &= ~MAC_CR_RXEN_;
                                SMC_SET_MAC_CR(lp, cr);
                                rx_overrun=1;
                                DBG(SMC_DEBUG_RX, dev, "RX overrun\n");
                                dev->stats.rx_errors++;
                                dev->stats.rx_fifo_errors++;
                        }
                        SMC_ACK_INT(lp, INT_STS_RDFO_);
                }
                /* Handle receive condition */
                if ((status & INT_STS_RSFL_) || rx_overrun) {
                        unsigned int fifo;
                        DBG(SMC_DEBUG_RX, dev, "RX irq\n");
                        fifo = SMC_GET_RX_FIFO_INF(lp);
                        pkts = (fifo & RX_FIFO_INF_RXSUSED_) >> 16;
                        DBG(SMC_DEBUG_RX, dev, "Rx FIFO pkts %d, bytes %d\n",
                            pkts, fifo & 0xFFFF);
                        if (pkts != 0) {
#ifdef SMC_USE_DMA
                                unsigned int fifo;
                                if (lp->rxdma_active){
                                        DBG(SMC_DEBUG_RX | SMC_DEBUG_DMA, dev,
                                            "RX DMA active\n");
                                        /* The DMA is already running so up the IRQ threshold */
                                        fifo = SMC_GET_FIFO_INT(lp) & ~0xFF;
                                        fifo |= pkts & 0xFF;
                                        DBG(SMC_DEBUG_RX, dev,
                                            "Setting RX stat FIFO threshold to %d\n",
                                            fifo & 0xff);
                                        SMC_SET_FIFO_INT(lp, fifo);
                                } else
#endif
                                smc911x_rcv(dev);
                        }
                        SMC_ACK_INT(lp, INT_STS_RSFL_);
                }
                /* Handle transmit FIFO available */
                if (status & INT_STS_TDFA_) {
                        DBG(SMC_DEBUG_TX, dev, "TX data FIFO space available irq\n");
                        SMC_SET_FIFO_TDA(lp, 0xFF);
                        lp->tx_throttle = 0;
#ifdef SMC_USE_DMA
                        if (!lp->txdma_active)
#endif
                                netif_wake_queue(dev);
                        SMC_ACK_INT(lp, INT_STS_TDFA_);
                }
                /* Handle transmit done condition */
#if 1
                if (status & (INT_STS_TSFL_ | INT_STS_GPT_INT_)) {
                        DBG(SMC_DEBUG_TX | SMC_DEBUG_MISC, dev,
                            "Tx stat FIFO limit (%d) /GPT irq\n",
                            (SMC_GET_FIFO_INT(lp) & 0x00ff0000) >> 16);
                        smc911x_tx(dev);
                        SMC_SET_GPT_CFG(lp, GPT_CFG_TIMER_EN_ | 10000);
                        SMC_ACK_INT(lp, INT_STS_TSFL_);
                        SMC_ACK_INT(lp, INT_STS_TSFL_ | INT_STS_GPT_INT_);
                }
#else
                if (status & INT_STS_TSFL_) {
                        DBG(SMC_DEBUG_TX, dev, "TX status FIFO limit (%d) irq\n", ?);
                        smc911x_tx(dev);
                        SMC_ACK_INT(lp, INT_STS_TSFL_);
                }

                if (status & INT_STS_GPT_INT_) {
                        DBG(SMC_DEBUG_RX, dev, "IRQ_CFG 0x%08x FIFO_INT 0x%08x RX_CFG 0x%08x\n",
                            SMC_GET_IRQ_CFG(lp),
                            SMC_GET_FIFO_INT(lp),
                            SMC_GET_RX_CFG(lp));
                        DBG(SMC_DEBUG_RX, dev, "Rx Stat FIFO Used 0x%02x Data FIFO Used 0x%04x Stat FIFO 0x%08x\n",
                            (SMC_GET_RX_FIFO_INF(lp) & 0x00ff0000) >> 16,
                            SMC_GET_RX_FIFO_INF(lp) & 0xffff,
                            SMC_GET_RX_STS_FIFO_PEEK(lp));
                        SMC_SET_GPT_CFG(lp, GPT_CFG_TIMER_EN_ | 10000);
                        SMC_ACK_INT(lp, INT_STS_GPT_INT_);
                }
#endif

                /* Handle PHY interrupt condition */
                if (status & INT_STS_PHY_INT_) {
                        DBG(SMC_DEBUG_MISC, dev, "PHY irq\n");
                        smc911x_phy_interrupt(dev);
                        SMC_ACK_INT(lp, INT_STS_PHY_INT_);
                }
        } while (--timeout);

        /* restore mask state */
        SMC_SET_INT_EN(lp, mask);

        DBG(SMC_DEBUG_MISC, dev, "Interrupt done (%d loops)\n",
            8-timeout);

        spin_unlock_irqrestore(&lp->lock, flags);

        return IRQ_HANDLED;
}

#ifdef SMC_USE_DMA
static void
smc911x_tx_dma_irq(void *data)
{
        struct smc911x_local *lp = data;
        struct net_device *dev = lp->netdev;
        struct sk_buff *skb = lp->current_tx_skb;
        unsigned long flags;

        DBG(SMC_DEBUG_FUNC, dev, "--> %s\n", __func__);

        DBG(SMC_DEBUG_TX | SMC_DEBUG_DMA, dev, "TX DMA irq handler\n");
        BUG_ON(skb == NULL);
        dma_unmap_single(lp->dev, tx_dmabuf, tx_dmalen, DMA_TO_DEVICE);
        netif_trans_update(dev);
        dev_kfree_skb_irq(skb);
        lp->current_tx_skb = NULL;
        if (lp->pending_tx_skb != NULL)
                smc911x_hardware_send_pkt(dev);
        else {
                DBG(SMC_DEBUG_TX | SMC_DEBUG_DMA, dev,
                    "No pending Tx packets. DMA disabled\n");
                spin_lock_irqsave(&lp->lock, flags);
                lp->txdma_active = 0;
                if (!lp->tx_throttle) {
                        netif_wake_queue(dev);
                }
                spin_unlock_irqrestore(&lp->lock, flags);
        }

        DBG(SMC_DEBUG_TX | SMC_DEBUG_DMA, dev,
            "TX DMA irq completed\n");
}
static void
smc911x_rx_dma_irq(void *data)
{
        struct smc911x_local *lp = data;
        struct net_device *dev = lp->netdev;
        struct sk_buff *skb = lp->current_rx_skb;
        unsigned long flags;
        unsigned int pkts;

        DBG(SMC_DEBUG_FUNC, dev, "--> %s\n", __func__);
        DBG(SMC_DEBUG_RX | SMC_DEBUG_DMA, dev, "RX DMA irq handler\n");
        dma_unmap_single(lp->dev, rx_dmabuf, rx_dmalen, DMA_FROM_DEVICE);
        BUG_ON(skb == NULL);
        lp->current_rx_skb = NULL;
        PRINT_PKT(skb->data, skb->len);
        skb->protocol = eth_type_trans(skb, dev);
        dev->stats.rx_packets++;
        dev->stats.rx_bytes += skb->len;
        netif_rx(skb);

        spin_lock_irqsave(&lp->lock, flags);
        pkts = (SMC_GET_RX_FIFO_INF(lp) & RX_FIFO_INF_RXSUSED_) >> 16;
        if (pkts != 0) {
                smc911x_rcv(dev);
        }else {
                lp->rxdma_active = 0;
        }
        spin_unlock_irqrestore(&lp->lock, flags);
        DBG(SMC_DEBUG_RX | SMC_DEBUG_DMA, dev,
            "RX DMA irq completed. DMA RX FIFO PKTS %d\n",
            pkts);
}
#endif   /* SMC_USE_DMA */

#ifdef CONFIG_NET_POLL_CONTROLLER
/*
 * Polling receive - used by netconsole and other diagnostic tools
 * to allow network i/o with interrupts disabled.
 */
static void smc911x_poll_controller(struct net_device *dev)
{
        disable_irq(dev->irq);
        smc911x_interrupt(dev->irq, dev);
        enable_irq(dev->irq);
}
#endif

/* Our watchdog timed out. Called by the networking layer */
static void smc911x_timeout(struct net_device *dev, unsigned int txqueue)
{
        struct smc911x_local *lp = netdev_priv(dev);
        int status, mask;
        unsigned long flags;

        DBG(SMC_DEBUG_FUNC, dev, "--> %s\n", __func__);

        spin_lock_irqsave(&lp->lock, flags);
        status = SMC_GET_INT(lp);
        mask = SMC_GET_INT_EN(lp);
        spin_unlock_irqrestore(&lp->lock, flags);
        DBG(SMC_DEBUG_MISC, dev, "INT 0x%02x MASK 0x%02x\n",
            status, mask);

        /* Dump the current TX FIFO contents and restart */
        mask = SMC_GET_TX_CFG(lp);
        SMC_SET_TX_CFG(lp, mask | TX_CFG_TXS_DUMP_ | TX_CFG_TXD_DUMP_);
        /*
         * Reconfiguring the PHY doesn't seem like a bad idea here, but
         * smc911x_phy_configure() calls msleep() which calls schedule_timeout()
         * which calls schedule().       Hence we use a work queue.
         */
        if (lp->phy_type != 0)
                schedule_work(&lp->phy_configure);

        /* We can accept TX packets again */
        netif_trans_update(dev); /* prevent tx timeout */
        netif_wake_queue(dev);
}

/*
 * This routine will, depending on the values passed to it,
 * either make it accept multicast packets, go into
 * promiscuous mode (for TCPDUMP and cousins) or accept
 * a select set of multicast packets
 */
static void smc911x_set_multicast_list(struct net_device *dev)
{
        struct smc911x_local *lp = netdev_priv(dev);
        unsigned int multicast_table[2];
        unsigned int mcr, update_multicast = 0;
        unsigned long flags;

        DBG(SMC_DEBUG_FUNC, dev, "--> %s\n", __func__);

        spin_lock_irqsave(&lp->lock, flags);
        SMC_GET_MAC_CR(lp, mcr);
        spin_unlock_irqrestore(&lp->lock, flags);

        if (dev->flags & IFF_PROMISC) {

                DBG(SMC_DEBUG_MISC, dev, "RCR_PRMS\n");
                mcr |= MAC_CR_PRMS_;
        }
        /*
         * Here, I am setting this to accept all multicast packets.
         * I don't need to zero the multicast table, because the flag is
         * checked before the table is
         */
        else if (dev->flags & IFF_ALLMULTI || netdev_mc_count(dev) > 16) {
                DBG(SMC_DEBUG_MISC, dev, "RCR_ALMUL\n");
                mcr |= MAC_CR_MCPAS_;
        }

        /*
         * This sets the internal hardware table to filter out unwanted
         * multicast packets before they take up memory.
         *
         * The SMC chip uses a hash table where the high 6 bits of the CRC of
         * address are the offset into the table.       If that bit is 1, then the
         * multicast packet is accepted.  Otherwise, it's dropped silently.
         *
         * To use the 6 bits as an offset into the table, the high 1 bit is
         * the number of the 32 bit register, while the low 5 bits are the bit
         * within that register.
         */
        else if (!netdev_mc_empty(dev)) {
                struct netdev_hw_addr *ha;

                /* Set the Hash perfec mode */
                mcr |= MAC_CR_HPFILT_;

                /* start with a table of all zeros: reject all */
                memset(multicast_table, 0, sizeof(multicast_table));

                netdev_for_each_mc_addr(ha, dev) {
                        u32 position;

                        /* upper 6 bits are used as hash index */
                        position = ether_crc(ETH_ALEN, ha->addr)>>26;

                        multicast_table[position>>5] |= 1 << (position&0x1f);
                }

                /* be sure I get rid of flags I might have set */
                mcr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);

                /* now, the table can be loaded into the chipset */
                update_multicast = 1;
        } else   {
                DBG(SMC_DEBUG_MISC, dev, "~(MAC_CR_PRMS_|MAC_CR_MCPAS_)\n");
                mcr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);

                /*
                 * since I'm disabling all multicast entirely, I need to
                 * clear the multicast list
                 */
                memset(multicast_table, 0, sizeof(multicast_table));
                update_multicast = 1;
        }

        spin_lock_irqsave(&lp->lock, flags);
        SMC_SET_MAC_CR(lp, mcr);
        if (update_multicast) {
                DBG(SMC_DEBUG_MISC, dev,
                    "update mcast hash table 0x%08x 0x%08x\n",
                    multicast_table[0], multicast_table[1]);
                SMC_SET_HASHL(lp, multicast_table[0]);
                SMC_SET_HASHH(lp, multicast_table[1]);
        }
        spin_unlock_irqrestore(&lp->lock, flags);
}


/*
 * Open and Initialize the board
 *
 * Set up everything, reset the card, etc..
 */
static int
smc911x_open(struct net_device *dev)
{
        struct smc911x_local *lp = netdev_priv(dev);

        DBG(SMC_DEBUG_FUNC, dev, "--> %s\n", __func__);

        /* reset the hardware */
        smc911x_reset(dev);

        /* Configure the PHY, initialize the link state */
        smc911x_phy_configure(&lp->phy_configure);

        /* Turn on Tx + Rx */
        smc911x_enable(dev);

        netif_start_queue(dev);

        return 0;
}

/*
 * smc911x_close
 *
 * this makes the board clean up everything that it can
 * and not talk to the outside world.    Caused by
 * an 'ifconfig ethX down'
 */
static int smc911x_close(struct net_device *dev)
{
        struct smc911x_local *lp = netdev_priv(dev);

        DBG(SMC_DEBUG_FUNC, dev, "--> %s\n", __func__);

        netif_stop_queue(dev);
        netif_carrier_off(dev);

        /* clear everything */
        smc911x_shutdown(dev);

        if (lp->phy_type != 0) {
                /* We need to ensure that no calls to
                 * smc911x_phy_configure are pending.
                 */
                cancel_work_sync(&lp->phy_configure);
                smc911x_phy_powerdown(dev, lp->mii.phy_id);
        }

        if (lp->pending_tx_skb) {
                dev_kfree_skb(lp->pending_tx_skb);
                lp->pending_tx_skb = NULL;
        }

        return 0;
}

/*
 * Ethtool support
 */
static int
smc911x_ethtool_get_link_ksettings(struct net_device *dev,
                                   struct ethtool_link_ksettings *cmd)
{
        struct smc911x_local *lp = netdev_priv(dev);
        int status;
        unsigned long flags;
        u32 supported;

        DBG(SMC_DEBUG_FUNC, dev, "--> %s\n", __func__);

        if (lp->phy_type != 0) {
                spin_lock_irqsave(&lp->lock, flags);
                mii_ethtool_get_link_ksettings(&lp->mii, cmd);
                spin_unlock_irqrestore(&lp->lock, flags);
        } else {
                supported = SUPPORTED_10baseT_Half |
                                SUPPORTED_10baseT_Full |
                                SUPPORTED_TP | SUPPORTED_AUI;

                if (lp->ctl_rspeed == 10)
                        cmd->base.speed = SPEED_10;
                else if (lp->ctl_rspeed == 100)
                        cmd->base.speed = SPEED_100;

                cmd->base.autoneg = AUTONEG_DISABLE;
                cmd->base.port = 0;
                SMC_GET_PHY_SPECIAL(lp, lp->mii.phy_id, status);
                cmd->base.duplex =
                        (status & (PHY_SPECIAL_SPD_10FULL_ | PHY_SPECIAL_SPD_100FULL_)) ?
                                DUPLEX_FULL : DUPLEX_HALF;

                ethtool_convert_legacy_u32_to_link_mode(
                        cmd->link_modes.supported, supported);

        }

        return 0;
}

static int
smc911x_ethtool_set_link_ksettings(struct net_device *dev,
                                   const struct ethtool_link_ksettings *cmd)
{
        struct smc911x_local *lp = netdev_priv(dev);
        int ret;
        unsigned long flags;

        if (lp->phy_type != 0) {
                spin_lock_irqsave(&lp->lock, flags);
                ret = mii_ethtool_set_link_ksettings(&lp->mii, cmd);
                spin_unlock_irqrestore(&lp->lock, flags);
        } else {
                if (cmd->base.autoneg != AUTONEG_DISABLE ||
                    cmd->base.speed != SPEED_10 ||
                    (cmd->base.duplex != DUPLEX_HALF &&
                     cmd->base.duplex != DUPLEX_FULL) ||
                    (cmd->base.port != PORT_TP &&
                     cmd->base.port != PORT_AUI))
                        return -EINVAL;

                lp->ctl_rfduplx = cmd->base.duplex == DUPLEX_FULL;

                ret = 0;
        }

        return ret;
}

static void
smc911x_ethtool_getdrvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
        strlcpy(info->driver, CARDNAME, sizeof(info->driver));
        strlcpy(info->version, version, sizeof(info->version));
        strlcpy(info->bus_info, dev_name(dev->dev.parent),
                sizeof(info->bus_info));
}

static int smc911x_ethtool_nwayreset(struct net_device *dev)
{
        struct smc911x_local *lp = netdev_priv(dev);
        int ret = -EINVAL;
        unsigned long flags;

        if (lp->phy_type != 0) {
                spin_lock_irqsave(&lp->lock, flags);
                ret = mii_nway_restart(&lp->mii);
                spin_unlock_irqrestore(&lp->lock, flags);
        }

        return ret;
}

static u32 smc911x_ethtool_getmsglevel(struct net_device *dev)
{
        struct smc911x_local *lp = netdev_priv(dev);
        return lp->msg_enable;
}

static void smc911x_ethtool_setmsglevel(struct net_device *dev, u32 level)
{
        struct smc911x_local *lp = netdev_priv(dev);
        lp->msg_enable = level;
}

static int smc911x_ethtool_getregslen(struct net_device *dev)
{
        /* System regs + MAC regs + PHY regs */
        return (((E2P_CMD - ID_REV)/4 + 1) +
                        (WUCSR - MAC_CR)+1 + 32) * sizeof(u32);
}

static void smc911x_ethtool_getregs(struct net_device *dev,
                                    struct ethtool_regs *regs, void *buf)
{
        struct smc911x_local *lp = netdev_priv(dev);
        unsigned long flags;
        u32 reg,i,j=0;
        u32 *data = (u32*)buf;

        regs->version = lp->version;
        for(i=ID_REV;i<=E2P_CMD;i+=4) {
                data[j++] = SMC_inl(lp, i);
        }
        for(i=MAC_CR;i<=WUCSR;i++) {
                spin_lock_irqsave(&lp->lock, flags);
                SMC_GET_MAC_CSR(lp, i, reg);
                spin_unlock_irqrestore(&lp->lock, flags);
                data[j++] = reg;
        }
        for(i=0;i<=31;i++) {
                spin_lock_irqsave(&lp->lock, flags);
                SMC_GET_MII(lp, i, lp->mii.phy_id, reg);
                spin_unlock_irqrestore(&lp->lock, flags);
                data[j++] = reg & 0xFFFF;
        }
}

static int smc911x_ethtool_wait_eeprom_ready(struct net_device *dev)
{
        struct smc911x_local *lp = netdev_priv(dev);
        unsigned int timeout;
        int e2p_cmd;

        e2p_cmd = SMC_GET_E2P_CMD(lp);
        for(timeout=10;(e2p_cmd & E2P_CMD_EPC_BUSY_) && timeout; timeout--) {
                if (e2p_cmd & E2P_CMD_EPC_TIMEOUT_) {
                        PRINTK(dev, "%s timeout waiting for EEPROM to respond\n",
                               __func__);
                        return -EFAULT;
                }
                mdelay(1);
                e2p_cmd = SMC_GET_E2P_CMD(lp);
        }
        if (timeout == 0) {
                PRINTK(dev, "%s timeout waiting for EEPROM CMD not busy\n",
                       __func__);
                return -ETIMEDOUT;
        }
        return 0;
}

static inline int smc911x_ethtool_write_eeprom_cmd(struct net_device *dev,
                                                   int cmd, int addr)
{
        struct smc911x_local *lp = netdev_priv(dev);
        int ret;

        if ((ret = smc911x_ethtool_wait_eeprom_ready(dev))!=0)
                return ret;
        SMC_SET_E2P_CMD(lp, E2P_CMD_EPC_BUSY_ |
                ((cmd) & (0x7<<28)) |
                ((addr) & 0xFF));
        return 0;
}

static inline int smc911x_ethtool_read_eeprom_byte(struct net_device *dev,
                                                   u8 *data)
{
        struct smc911x_local *lp = netdev_priv(dev);
        int ret;

        if ((ret = smc911x_ethtool_wait_eeprom_ready(dev))!=0)
                return ret;
        *data = SMC_GET_E2P_DATA(lp);
        return 0;
}

static inline int smc911x_ethtool_write_eeprom_byte(struct net_device *dev,
                                                    u8 data)
{
        struct smc911x_local *lp = netdev_priv(dev);
        int ret;

        if ((ret = smc911x_ethtool_wait_eeprom_ready(dev))!=0)
                return ret;
        SMC_SET_E2P_DATA(lp, data);
        return 0;
}

static int smc911x_ethtool_geteeprom(struct net_device *dev,
                                     struct ethtool_eeprom *eeprom, u8 *data)
{
        u8 eebuf[SMC911X_EEPROM_LEN];
        int i, ret;

        for(i=0;i<SMC911X_EEPROM_LEN;i++) {
                if ((ret=smc911x_ethtool_write_eeprom_cmd(dev, E2P_CMD_EPC_CMD_READ_, i ))!=0)
                        return ret;
                if ((ret=smc911x_ethtool_read_eeprom_byte(dev, &eebuf[i]))!=0)
                        return ret;
                }
        memcpy(data, eebuf+eeprom->offset, eeprom->len);
        return 0;
}

static int smc911x_ethtool_seteeprom(struct net_device *dev,
                                     struct ethtool_eeprom *eeprom, u8 *data)
{
        int i, ret;

        /* Enable erase */
        if ((ret=smc911x_ethtool_write_eeprom_cmd(dev, E2P_CMD_EPC_CMD_EWEN_, 0 ))!=0)
                return ret;
        for(i=eeprom->offset;i<(eeprom->offset+eeprom->len);i++) {
                /* erase byte */
                if ((ret=smc911x_ethtool_write_eeprom_cmd(dev, E2P_CMD_EPC_CMD_ERASE_, i ))!=0)
                        return ret;
                /* write byte */
                if ((ret=smc911x_ethtool_write_eeprom_byte(dev, *data))!=0)
                         return ret;
                if ((ret=smc911x_ethtool_write_eeprom_cmd(dev, E2P_CMD_EPC_CMD_WRITE_, i ))!=0)
                        return ret;
                }
         return 0;
}

static int smc911x_ethtool_geteeprom_len(struct net_device *dev)
{
         return SMC911X_EEPROM_LEN;
}

static const struct ethtool_ops smc911x_ethtool_ops = {
        .get_drvinfo     = smc911x_ethtool_getdrvinfo,
        .get_msglevel    = smc911x_ethtool_getmsglevel,
        .set_msglevel    = smc911x_ethtool_setmsglevel,
        .nway_reset = smc911x_ethtool_nwayreset,
        .get_link        = ethtool_op_get_link,
        .get_regs_len    = smc911x_ethtool_getregslen,
        .get_regs        = smc911x_ethtool_getregs,
        .get_eeprom_len = smc911x_ethtool_geteeprom_len,
        .get_eeprom = smc911x_ethtool_geteeprom,
        .set_eeprom = smc911x_ethtool_seteeprom,
        .get_link_ksettings      = smc911x_ethtool_get_link_ksettings,
        .set_link_ksettings      = smc911x_ethtool_set_link_ksettings,
};

/*
 * smc911x_findirq
 *
 * This routine has a simple purpose -- make the SMC chip generate an
 * interrupt, so an auto-detect routine can detect it, and find the IRQ,
 */
static int smc911x_findirq(struct net_device *dev)
{
        struct smc911x_local *lp = netdev_priv(dev);
        int timeout = 20;
        unsigned long cookie;

        DBG(SMC_DEBUG_FUNC, dev, "--> %s\n", __func__);

        cookie = probe_irq_on();

        /*
         * Force a SW interrupt
         */

        SMC_SET_INT_EN(lp, INT_EN_SW_INT_EN_);

        /*
         * Wait until positive that the interrupt has been generated
         */
        do {
                int int_status;
                udelay(10);
                int_status = SMC_GET_INT_EN(lp);
                if (int_status & INT_EN_SW_INT_EN_)
                         break;         /* got the interrupt */
        } while (--timeout);

        /*
         * there is really nothing that I can do here if timeout fails,
         * as autoirq_report will return a 0 anyway, which is what I
         * want in this case.    Plus, the clean up is needed in both
         * cases.
         */

        /* and disable all interrupts again */
        SMC_SET_INT_EN(lp, 0);

        /* and return what I found */
        return probe_irq_off(cookie);
}

static const struct net_device_ops smc911x_netdev_ops = {
        .ndo_open               = smc911x_open,
        .ndo_stop               = smc911x_close,
        .ndo_start_xmit         = smc911x_hard_start_xmit,
        .ndo_tx_timeout         = smc911x_timeout,
        .ndo_set_rx_mode        = smc911x_set_multicast_list,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_set_mac_address    = eth_mac_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller    = smc911x_poll_controller,
#endif
};

/*
 * Function: smc911x_probe(unsigned long ioaddr)
 *
 * Purpose:
 *       Tests to see if a given ioaddr points to an SMC911x chip.
 *       Returns a 0 on success
 *
 * Algorithm:
 *       (1) see if the endian word is OK
 *       (1) see if I recognize the chip ID in the appropriate register
 *
 * Here I do typical initialization tasks.
 *
 * o  Initialize the structure if needed
 * o  print out my vanity message if not done so already
 * o  print out what type of hardware is detected
 * o  print out the ethernet address
 * o  find the IRQ
 * o  set up my private data
 * o  configure the dev structure with my subroutines
 * o  actually GRAB the irq.
 * o  GRAB the region
 */
static int smc911x_probe(struct net_device *dev)
{
        struct smc911x_local *lp = netdev_priv(dev);
        int i, retval;
        unsigned int val, chip_id, revision;
        const char *version_string;
        unsigned long irq_flags;
#ifdef SMC_USE_DMA
        struct dma_slave_config config;
        dma_cap_mask_t mask;
#endif

        DBG(SMC_DEBUG_FUNC, dev, "--> %s\n", __func__);

        /* First, see if the endian word is recognized */
        val = SMC_GET_BYTE_TEST(lp);
        DBG(SMC_DEBUG_MISC, dev, "%s: endian probe returned 0x%04x\n",
            CARDNAME, val);
        if (val != 0x87654321) {
                netdev_err(dev, "Invalid chip endian 0x%08x\n", val);
                retval = -ENODEV;
                goto err_out;
        }

        /*
         * check if the revision register is something that I
         * recognize.   These might need to be added to later,
         * as future revisions could be added.
         */
        chip_id = SMC_GET_PN(lp);
        DBG(SMC_DEBUG_MISC, dev, "%s: id probe returned 0x%04x\n",
            CARDNAME, chip_id);
        for(i=0;chip_ids[i].id != 0; i++) {
                if (chip_ids[i].id == chip_id) break;
        }
        if (!chip_ids[i].id) {
                netdev_err(dev, "Unknown chip ID %04x\n", chip_id);
                retval = -ENODEV;
                goto err_out;
        }
        version_string = chip_ids[i].name;

        revision = SMC_GET_REV(lp);
        DBG(SMC_DEBUG_MISC, dev, "%s: revision = 0x%04x\n", CARDNAME, revision);

        /* At this point I'll assume that the chip is an SMC911x. */
        DBG(SMC_DEBUG_MISC, dev, "%s: Found a %s\n",
            CARDNAME, chip_ids[i].name);

        /* Validate the TX FIFO size requested */
        if ((tx_fifo_kb < 2) || (tx_fifo_kb > 14)) {
                netdev_err(dev, "Invalid TX FIFO size requested %d\n",
                           tx_fifo_kb);
                retval = -EINVAL;
                goto err_out;
        }

        /* fill in some of the fields */
        lp->version = chip_ids[i].id;
        lp->revision = revision;
        lp->tx_fifo_kb = tx_fifo_kb;
        /* Reverse calculate the RX FIFO size from the TX */
        lp->tx_fifo_size=(lp->tx_fifo_kb<<10) - 512;
        lp->rx_fifo_size= ((0x4000 - 512 - lp->tx_fifo_size) / 16) * 15;

        /* Set the automatic flow control values */
        switch(lp->tx_fifo_kb) {
                /*
                 *       AFC_HI is about ((Rx Data Fifo Size)*2/3)/64
                 *       AFC_LO is AFC_HI/2
                 *       BACK_DUR is about 5uS*(AFC_LO) rounded down
                 */
                case 2:/* 13440 Rx Data Fifo Size */
                        lp->afc_cfg=0x008C46AF;break;
                case 3:/* 12480 Rx Data Fifo Size */
                        lp->afc_cfg=0x0082419F;break;
                case 4:/* 11520 Rx Data Fifo Size */
                        lp->afc_cfg=0x00783C9F;break;
                case 5:/* 10560 Rx Data Fifo Size */
                        lp->afc_cfg=0x006E374F;break;
                case 6:/* 9600 Rx Data Fifo Size */
                        lp->afc_cfg=0x0064328F;break;
                case 7:/* 8640 Rx Data Fifo Size */
                        lp->afc_cfg=0x005A2D7F;break;
                case 8:/* 7680 Rx Data Fifo Size */
                        lp->afc_cfg=0x0050287F;break;
                case 9:/* 6720 Rx Data Fifo Size */
                        lp->afc_cfg=0x0046236F;break;
                case 10:/* 5760 Rx Data Fifo Size */
                        lp->afc_cfg=0x003C1E6F;break;
                case 11:/* 4800 Rx Data Fifo Size */
                        lp->afc_cfg=0x0032195F;break;
                /*
                 *       AFC_HI is ~1520 bytes less than RX Data Fifo Size
                 *       AFC_LO is AFC_HI/2
                 *       BACK_DUR is about 5uS*(AFC_LO) rounded down
                 */
                case 12:/* 3840 Rx Data Fifo Size */
                        lp->afc_cfg=0x0024124F;break;
                case 13:/* 2880 Rx Data Fifo Size */
                        lp->afc_cfg=0x0015073F;break;
                case 14:/* 1920 Rx Data Fifo Size */
                        lp->afc_cfg=0x0006032F;break;
                 default:
                         PRINTK(dev, "ERROR -- no AFC_CFG setting found");
                         break;
        }

        DBG(SMC_DEBUG_MISC | SMC_DEBUG_TX | SMC_DEBUG_RX, dev,
            "%s: tx_fifo %d rx_fifo %d afc_cfg 0x%08x\n", CARDNAME,
            lp->tx_fifo_size, lp->rx_fifo_size, lp->afc_cfg);

        spin_lock_init(&lp->lock);

        /* Get the MAC address */
        SMC_GET_MAC_ADDR(lp, dev->dev_addr);

        /* now, reset the chip, and put it into a known state */
        smc911x_reset(dev);

        /*
         * If dev->irq is 0, then the device has to be banged on to see
         * what the IRQ is.
         *
         * Specifying an IRQ is done with the assumption that the user knows
         * what (s)he is doing.  No checking is done!!!!
         */
        if (dev->irq < 1) {
                int trials;

                trials = 3;
                while (trials--) {
                        dev->irq = smc911x_findirq(dev);
                        if (dev->irq)
                                break;
                        /* kick the card and try again */
                        smc911x_reset(dev);
                }
        }
        if (dev->irq == 0) {
                netdev_warn(dev, "Couldn't autodetect your IRQ. Use irq=xx.\n");
                retval = -ENODEV;
                goto err_out;
        }
        dev->irq = irq_canonicalize(dev->irq);

        dev->netdev_ops = &smc911x_netdev_ops;
        dev->watchdog_timeo = msecs_to_jiffies(watchdog);
        dev->ethtool_ops = &smc911x_ethtool_ops;

        INIT_WORK(&lp->phy_configure, smc911x_phy_configure);
        lp->mii.phy_id_mask = 0x1f;
        lp->mii.reg_num_mask = 0x1f;
        lp->mii.force_media = 0;
        lp->mii.full_duplex = 0;
        lp->mii.dev = dev;
        lp->mii.mdio_read = smc911x_phy_read;
        lp->mii.mdio_write = smc911x_phy_write;

        /*
         * Locate the phy, if any.
         */
        smc911x_phy_detect(dev);

        /* Set default parameters */
        lp->msg_enable = NETIF_MSG_LINK;
        lp->ctl_rfduplx = 1;
        lp->ctl_rspeed = 100;

#ifdef SMC_DYNAMIC_BUS_CONFIG
        irq_flags = lp->cfg.irq_flags;
#else
        irq_flags = IRQF_SHARED | SMC_IRQ_SENSE;
#endif

        /* Grab the IRQ */
        retval = request_irq(dev->irq, smc911x_interrupt,
                             irq_flags, dev->name, dev);
        if (retval)
                goto err_out;

#ifdef SMC_USE_DMA

        dma_cap_zero(mask);
        dma_cap_set(DMA_SLAVE, mask);
        lp->rxdma = dma_request_channel(mask, NULL, NULL);
        lp->txdma = dma_request_channel(mask, NULL, NULL);
        lp->rxdma_active = 0;
        lp->txdma_active = 0;

        memset(&config, 0, sizeof(config));
        config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
        config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
        config.src_addr = lp->physaddr + RX_DATA_FIFO;
        config.dst_addr = lp->physaddr + TX_DATA_FIFO;
        config.src_maxburst = 32;
        config.dst_maxburst = 32;
        retval = dmaengine_slave_config(lp->rxdma, &config);
        if (retval) {
                dev_err(lp->dev, "dma rx channel configuration failed: %d\n",
                        retval);
                goto err_out;
        }
        retval = dmaengine_slave_config(lp->txdma, &config);
        if (retval) {
                dev_err(lp->dev, "dma tx channel configuration failed: %d\n",
                        retval);
                goto err_out;
        }
#endif

        retval = register_netdev(dev);
        if (retval == 0) {
                /* now, print out the card info, in a short format.. */
                netdev_info(dev, "%s (rev %d) at %#lx IRQ %d",
                            version_string, lp->revision,
                            dev->base_addr, dev->irq);

#ifdef SMC_USE_DMA
                if (lp->rxdma)
                        pr_cont(" RXDMA %p", lp->rxdma);

                if (lp->txdma)
                        pr_cont(" TXDMA %p", lp->txdma);
#endif
                pr_cont("\n");
                if (!is_valid_ether_addr(dev->dev_addr)) {
                        netdev_warn(dev, "Invalid ethernet MAC address. Please set using ifconfig\n");
                } else {
                        /* Print the Ethernet address */
                        netdev_info(dev, "Ethernet addr: %pM\n",
                                    dev->dev_addr);
                }

                if (lp->phy_type == 0) {
                        PRINTK(dev, "No PHY found\n");
                } else if ((lp->phy_type & ~0xff) == LAN911X_INTERNAL_PHY_ID) {
                        PRINTK(dev, "LAN911x Internal PHY\n");
                } else {
                        PRINTK(dev, "External PHY 0x%08x\n", lp->phy_type);
                }
        }

err_out:
#ifdef SMC_USE_DMA
        if (retval) {
                if (lp->rxdma)
                        dma_release_channel(lp->rxdma);
                if (lp->txdma)
                        dma_release_channel(lp->txdma);
        }
#endif
        return retval;
}

/*
 * smc911x_drv_probe(void)
 *
 *        Output:
 *       0 --> there is a device
 *       anything else, error
 */
static int smc911x_drv_probe(struct platform_device *pdev)
{
        struct net_device *ndev;
        struct resource *res;
        struct smc911x_local *lp;
        void __iomem *addr;
        int ret;

        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (!res) {
                ret = -ENODEV;
                goto out;
        }

        /*
         * Request the regions.
         */
        if (!request_mem_region(res->start, SMC911X_IO_EXTENT, CARDNAME)) {
                 ret = -EBUSY;
                 goto out;
        }

        ndev = alloc_etherdev(sizeof(struct smc911x_local));
        if (!ndev) {
                ret = -ENOMEM;
                goto release_1;
        }
        SET_NETDEV_DEV(ndev, &pdev->dev);

        ndev->dma = (unsigned char)-1;
        ndev->irq = platform_get_irq(pdev, 0);
        lp = netdev_priv(ndev);
        lp->netdev = ndev;
#ifdef SMC_DYNAMIC_BUS_CONFIG
        {
                struct smc911x_platdata *pd = dev_get_platdata(&pdev->dev);
                if (!pd) {
                        ret = -EINVAL;
                        goto release_both;
                }
                memcpy(&lp->cfg, pd, sizeof(lp->cfg));
        }
#endif

        addr = ioremap(res->start, SMC911X_IO_EXTENT);
        if (!addr) {
                ret = -ENOMEM;
                goto release_both;
        }

        platform_set_drvdata(pdev, ndev);
        lp->base = addr;
        ndev->base_addr = res->start;
        ret = smc911x_probe(ndev);
        if (ret != 0) {
                iounmap(addr);
release_both:
                free_netdev(ndev);
release_1:
                release_mem_region(res->start, SMC911X_IO_EXTENT);
out:
                pr_info("%s: not found (%d).\n", CARDNAME, ret);
        }
#ifdef SMC_USE_DMA
        else {
                lp->physaddr = res->start;
                lp->dev = &pdev->dev;
        }
#endif

        return ret;
}

static int smc911x_drv_remove(struct platform_device *pdev)
{
        struct net_device *ndev = platform_get_drvdata(pdev);
        struct smc911x_local *lp = netdev_priv(ndev);
        struct resource *res;

        DBG(SMC_DEBUG_FUNC, ndev, "--> %s\n", __func__);

        unregister_netdev(ndev);

        free_irq(ndev->irq, ndev);

#ifdef SMC_USE_DMA
        {
                if (lp->rxdma)
                        dma_release_channel(lp->rxdma);
                if (lp->txdma)
                        dma_release_channel(lp->txdma);
        }
#endif
        iounmap(lp->base);
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        release_mem_region(res->start, SMC911X_IO_EXTENT);

        free_netdev(ndev);
        return 0;
}

static int smc911x_drv_suspend(struct platform_device *dev, pm_message_t state)
{
        struct net_device *ndev = platform_get_drvdata(dev);
        struct smc911x_local *lp = netdev_priv(ndev);

        DBG(SMC_DEBUG_FUNC, ndev, "--> %s\n", __func__);
        if (ndev) {
                if (netif_running(ndev)) {
                        netif_device_detach(ndev);
                        smc911x_shutdown(ndev);
#if POWER_DOWN
                        /* Set D2 - Energy detect only setting */
                        SMC_SET_PMT_CTRL(lp, 2<<12);
#endif
                }
        }
        return 0;
}

static int smc911x_drv_resume(struct platform_device *dev)
{
        struct net_device *ndev = platform_get_drvdata(dev);

        DBG(SMC_DEBUG_FUNC, ndev, "--> %s\n", __func__);
        if (ndev) {
                struct smc911x_local *lp = netdev_priv(ndev);

                if (netif_running(ndev)) {
                        smc911x_reset(ndev);
                        if (lp->phy_type != 0)
                                smc911x_phy_configure(&lp->phy_configure);
                        smc911x_enable(ndev);
                        netif_device_attach(ndev);
                }
        }
        return 0;
}

static struct platform_driver smc911x_driver = {
        .probe           = smc911x_drv_probe,
        .remove  = smc911x_drv_remove,
        .suspend         = smc911x_drv_suspend,
        .resume  = smc911x_drv_resume,
        .driver  = {
                .name    = CARDNAME,
        },
};

module_platform_driver(smc911x_driver);