Save sram context after changing MPU, DSP or core clocks

[linux-ginger.git] / drivers / net / fec.c

/*
 * Fast Ethernet Controller (FEC) driver for Motorola MPC8xx.
 * Copyright (c) 1997 Dan Malek (dmalek@jlc.net)
 *
 * Right now, I am very wasteful with the buffers.  I allocate memory
 * pages and then divide them into 2K frame buffers.  This way I know I
 * have buffers large enough to hold one frame within one buffer descriptor.
 * Once I get this working, I will use 64 or 128 byte CPM buffers, which
 * will be much more memory efficient and will easily handle lots of
 * small packets.
 *
 * Much better multiple PHY support by Magnus Damm.
 * Copyright (c) 2000 Ericsson Radio Systems AB.
 *
 * Support for FEC controller of ColdFire processors.
 * Copyright (c) 2001-2005 Greg Ungerer (gerg@snapgear.com)
 *
 * Bug fixes and cleanup by Philippe De Muyter (phdm@macqel.be)
 * Copyright (c) 2004-2006 Macq Electronique SA.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/clk.h>
#include <linux/platform_device.h>

#include <asm/cacheflush.h>

#ifndef CONFIG_ARCH_MXC
#include <asm/coldfire.h>
#include <asm/mcfsim.h>
#endif

#include "fec.h"

#ifdef CONFIG_ARCH_MXC
#include <mach/hardware.h>
#define FEC_ALIGNMENT   0xf
#else
#define FEC_ALIGNMENT   0x3
#endif

/*
 * Define the fixed address of the FEC hardware.
 */
#if defined(CONFIG_M5272)
#define HAVE_mii_link_interrupt

static unsigned char    fec_mac_default[] = {
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};

/*
 * Some hardware gets it MAC address out of local flash memory.
 * if this is non-zero then assume it is the address to get MAC from.
 */
#if defined(CONFIG_NETtel)
#define FEC_FLASHMAC    0xf0006006
#elif defined(CONFIG_GILBARCONAP) || defined(CONFIG_SCALES)
#define FEC_FLASHMAC    0xf0006000
#elif defined(CONFIG_CANCam)
#define FEC_FLASHMAC    0xf0020000
#elif defined (CONFIG_M5272C3)
#define FEC_FLASHMAC    (0xffe04000 + 4)
#elif defined(CONFIG_MOD5272)
#define FEC_FLASHMAC    0xffc0406b
#else
#define FEC_FLASHMAC    0
#endif
#endif /* CONFIG_M5272 */

/* Forward declarations of some structures to support different PHYs */

typedef struct {
        uint mii_data;
        void (*funct)(uint mii_reg, struct net_device *dev);
} phy_cmd_t;

typedef struct {
        uint id;
        char *name;

        const phy_cmd_t *config;
        const phy_cmd_t *startup;
        const phy_cmd_t *ack_int;
        const phy_cmd_t *shutdown;
} phy_info_t;

/* The number of Tx and Rx buffers.  These are allocated from the page
 * pool.  The code may assume these are power of two, so it it best
 * to keep them that size.
 * We don't need to allocate pages for the transmitter.  We just use
 * the skbuffer directly.
 */
#define FEC_ENET_RX_PAGES       8
#define FEC_ENET_RX_FRSIZE      2048
#define FEC_ENET_RX_FRPPG       (PAGE_SIZE / FEC_ENET_RX_FRSIZE)
#define RX_RING_SIZE            (FEC_ENET_RX_FRPPG * FEC_ENET_RX_PAGES)
#define FEC_ENET_TX_FRSIZE      2048
#define FEC_ENET_TX_FRPPG       (PAGE_SIZE / FEC_ENET_TX_FRSIZE)
#define TX_RING_SIZE            16      /* Must be power of two */
#define TX_RING_MOD_MASK        15      /*   for this to work */

#if (((RX_RING_SIZE + TX_RING_SIZE) * 8) > PAGE_SIZE)
#error "FEC: descriptor ring size constants too large"
#endif

/* Interrupt events/masks. */
#define FEC_ENET_HBERR  ((uint)0x80000000)      /* Heartbeat error */
#define FEC_ENET_BABR   ((uint)0x40000000)      /* Babbling receiver */
#define FEC_ENET_BABT   ((uint)0x20000000)      /* Babbling transmitter */
#define FEC_ENET_GRA    ((uint)0x10000000)      /* Graceful stop complete */
#define FEC_ENET_TXF    ((uint)0x08000000)      /* Full frame transmitted */
#define FEC_ENET_TXB    ((uint)0x04000000)      /* A buffer was transmitted */
#define FEC_ENET_RXF    ((uint)0x02000000)      /* Full frame received */
#define FEC_ENET_RXB    ((uint)0x01000000)      /* A buffer was received */
#define FEC_ENET_MII    ((uint)0x00800000)      /* MII interrupt */
#define FEC_ENET_EBERR  ((uint)0x00400000)      /* SDMA bus error */

/* The FEC stores dest/src/type, data, and checksum for receive packets.
 */
#define PKT_MAXBUF_SIZE         1518
#define PKT_MINBUF_SIZE         64
#define PKT_MAXBLR_SIZE         1520


/*
 * The 5270/5271/5280/5282/532x RX control register also contains maximum frame
 * size bits. Other FEC hardware does not, so we need to take that into
 * account when setting it.
 */
#if defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x) || \
    defined(CONFIG_M520x) || defined(CONFIG_M532x) || defined(CONFIG_ARCH_MXC)
#define OPT_FRAME_SIZE  (PKT_MAXBUF_SIZE << 16)
#else
#define OPT_FRAME_SIZE  0
#endif

/* The FEC buffer descriptors track the ring buffers.  The rx_bd_base and
 * tx_bd_base always point to the base of the buffer descriptors.  The
 * cur_rx and cur_tx point to the currently available buffer.
 * The dirty_tx tracks the current buffer that is being sent by the
 * controller.  The cur_tx and dirty_tx are equal under both completely
 * empty and completely full conditions.  The empty/ready indicator in
 * the buffer descriptor determines the actual condition.
 */
struct fec_enet_private {
        /* Hardware registers of the FEC device */
        void __iomem *hwp;

        struct net_device *netdev;

        struct clk *clk;

        /* The saved address of a sent-in-place packet/buffer, for skfree(). */
        unsigned char *tx_bounce[TX_RING_SIZE];
        struct  sk_buff* tx_skbuff[TX_RING_SIZE];
        struct  sk_buff* rx_skbuff[RX_RING_SIZE];
        ushort  skb_cur;
        ushort  skb_dirty;

        /* CPM dual port RAM relative addresses */
        dma_addr_t      bd_dma;
        /* Address of Rx and Tx buffers */
        struct bufdesc  *rx_bd_base;
        struct bufdesc  *tx_bd_base;
        /* The next free ring entry */
        struct bufdesc  *cur_rx, *cur_tx; 
        /* The ring entries to be free()ed */
        struct bufdesc  *dirty_tx;

        uint    tx_full;
        /* hold while accessing the HW like ringbuffer for tx/rx but not MAC */
        spinlock_t hw_lock;
        /* hold while accessing the mii_list_t() elements */
        spinlock_t mii_lock;

        uint    phy_id;
        uint    phy_id_done;
        uint    phy_status;
        uint    phy_speed;
        phy_info_t const        *phy;
        struct work_struct phy_task;

        uint    sequence_done;
        uint    mii_phy_task_queued;

        uint    phy_addr;

        int     index;
        int     opened;
        int     link;
        int     old_link;
        int     full_duplex;
};

static void fec_enet_mii(struct net_device *dev);
static irqreturn_t fec_enet_interrupt(int irq, void * dev_id);
static void fec_enet_tx(struct net_device *dev);
static void fec_enet_rx(struct net_device *dev);
static int fec_enet_close(struct net_device *dev);
static void fec_restart(struct net_device *dev, int duplex);
static void fec_stop(struct net_device *dev);


/* MII processing.  We keep this as simple as possible.  Requests are
 * placed on the list (if there is room).  When the request is finished
 * by the MII, an optional function may be called.
 */
typedef struct mii_list {
        uint    mii_regval;
        void    (*mii_func)(uint val, struct net_device *dev);
        struct  mii_list *mii_next;
} mii_list_t;

#define         NMII    20
static mii_list_t       mii_cmds[NMII];
static mii_list_t       *mii_free;
static mii_list_t       *mii_head;
static mii_list_t       *mii_tail;

static int      mii_queue(struct net_device *dev, int request,
                                void (*func)(uint, struct net_device *));

/* Make MII read/write commands for the FEC */
#define mk_mii_read(REG)        (0x60020000 | ((REG & 0x1f) << 18))
#define mk_mii_write(REG, VAL)  (0x50020000 | ((REG & 0x1f) << 18) | \
                                                (VAL & 0xffff))
#define mk_mii_end      0

/* Transmitter timeout */
#define TX_TIMEOUT (2 * HZ)

/* Register definitions for the PHY */

#define MII_REG_CR          0  /* Control Register                         */
#define MII_REG_SR          1  /* Status Register                          */
#define MII_REG_PHYIR1      2  /* PHY Identification Register 1            */
#define MII_REG_PHYIR2      3  /* PHY Identification Register 2            */
#define MII_REG_ANAR        4  /* A-N Advertisement Register               */
#define MII_REG_ANLPAR      5  /* A-N Link Partner Ability Register        */
#define MII_REG_ANER        6  /* A-N Expansion Register                   */
#define MII_REG_ANNPTR      7  /* A-N Next Page Transmit Register          */
#define MII_REG_ANLPRNPR    8  /* A-N Link Partner Received Next Page Reg. */

/* values for phy_status */

#define PHY_CONF_ANE    0x0001  /* 1 auto-negotiation enabled */
#define PHY_CONF_LOOP   0x0002  /* 1 loopback mode enabled */
#define PHY_CONF_SPMASK 0x00f0  /* mask for speed */
#define PHY_CONF_10HDX  0x0010  /* 10 Mbit half duplex supported */
#define PHY_CONF_10FDX  0x0020  /* 10 Mbit full duplex supported */
#define PHY_CONF_100HDX 0x0040  /* 100 Mbit half duplex supported */
#define PHY_CONF_100FDX 0x0080  /* 100 Mbit full duplex supported */

#define PHY_STAT_LINK   0x0100  /* 1 up - 0 down */
#define PHY_STAT_FAULT  0x0200  /* 1 remote fault */
#define PHY_STAT_ANC    0x0400  /* 1 auto-negotiation complete  */
#define PHY_STAT_SPMASK 0xf000  /* mask for speed */
#define PHY_STAT_10HDX  0x1000  /* 10 Mbit half duplex selected */
#define PHY_STAT_10FDX  0x2000  /* 10 Mbit full duplex selected */
#define PHY_STAT_100HDX 0x4000  /* 100 Mbit half duplex selected */
#define PHY_STAT_100FDX 0x8000  /* 100 Mbit full duplex selected */


static int
fec_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);
        struct bufdesc *bdp;
        void *bufaddr;
        unsigned short  status;
        unsigned long flags;

        if (!fep->link) {
                /* Link is down or autonegotiation is in progress. */
                return NETDEV_TX_BUSY;
        }

        spin_lock_irqsave(&fep->hw_lock, flags);
        /* Fill in a Tx ring entry */
        bdp = fep->cur_tx;

        status = bdp->cbd_sc;

        if (status & BD_ENET_TX_READY) {
                /* Ooops.  All transmit buffers are full.  Bail out.
                 * This should not happen, since dev->tbusy should be set.
                 */
                printk("%s: tx queue full!.\n", dev->name);
                spin_unlock_irqrestore(&fep->hw_lock, flags);
                return NETDEV_TX_BUSY;
        }

        /* Clear all of the status flags */
        status &= ~BD_ENET_TX_STATS;

        /* Set buffer length and buffer pointer */
        bufaddr = skb->data;
        bdp->cbd_datlen = skb->len;

        /*
         * On some FEC implementations data must be aligned on
         * 4-byte boundaries. Use bounce buffers to copy data
         * and get it aligned. Ugh.
         */
        if (((unsigned long) bufaddr) & FEC_ALIGNMENT) {
                unsigned int index;
                index = bdp - fep->tx_bd_base;
                memcpy(fep->tx_bounce[index], (void *)skb->data, skb->len);
                bufaddr = fep->tx_bounce[index];
        }

        /* Save skb pointer */
        fep->tx_skbuff[fep->skb_cur] = skb;

        dev->stats.tx_bytes += skb->len;
        fep->skb_cur = (fep->skb_cur+1) & TX_RING_MOD_MASK;

        /* Push the data cache so the CPM does not get stale memory
         * data.
         */
        bdp->cbd_bufaddr = dma_map_single(&dev->dev, bufaddr,
                        FEC_ENET_TX_FRSIZE, DMA_TO_DEVICE);

        /* Send it on its way.  Tell FEC it's ready, interrupt when done,
         * it's the last BD of the frame, and to put the CRC on the end.
         */
        status |= (BD_ENET_TX_READY | BD_ENET_TX_INTR
                        | BD_ENET_TX_LAST | BD_ENET_TX_TC);
        bdp->cbd_sc = status;

        dev->trans_start = jiffies;

        /* Trigger transmission start */
        writel(0, fep->hwp + FEC_X_DES_ACTIVE);

        /* If this was the last BD in the ring, start at the beginning again. */
        if (status & BD_ENET_TX_WRAP)
                bdp = fep->tx_bd_base;
        else
                bdp++;

        if (bdp == fep->dirty_tx) {
                fep->tx_full = 1;
                netif_stop_queue(dev);
        }

        fep->cur_tx = bdp;

        spin_unlock_irqrestore(&fep->hw_lock, flags);

        return NETDEV_TX_OK;
}

static void
fec_timeout(struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);

        dev->stats.tx_errors++;

        fec_restart(dev, fep->full_duplex);
        netif_wake_queue(dev);
}

static irqreturn_t
fec_enet_interrupt(int irq, void * dev_id)
{
        struct  net_device *dev = dev_id;
        struct fec_enet_private *fep = netdev_priv(dev);
        uint    int_events;
        irqreturn_t ret = IRQ_NONE;

        do {
                int_events = readl(fep->hwp + FEC_IEVENT);
                writel(int_events, fep->hwp + FEC_IEVENT);

                if (int_events & FEC_ENET_RXF) {
                        ret = IRQ_HANDLED;
                        fec_enet_rx(dev);
                }

                /* Transmit OK, or non-fatal error. Update the buffer
                 * descriptors. FEC handles all errors, we just discover
                 * them as part of the transmit process.
                 */
                if (int_events & FEC_ENET_TXF) {
                        ret = IRQ_HANDLED;
                        fec_enet_tx(dev);
                }

                if (int_events & FEC_ENET_MII) {
                        ret = IRQ_HANDLED;
                        fec_enet_mii(dev);
                }

        } while (int_events);

        return ret;
}


static void
fec_enet_tx(struct net_device *dev)
{
        struct  fec_enet_private *fep;
        struct bufdesc *bdp;
        unsigned short status;
        struct  sk_buff *skb;

        fep = netdev_priv(dev);
        spin_lock(&fep->hw_lock);
        bdp = fep->dirty_tx;

        while (((status = bdp->cbd_sc) & BD_ENET_TX_READY) == 0) {
                if (bdp == fep->cur_tx && fep->tx_full == 0)
                        break;

                dma_unmap_single(&dev->dev, bdp->cbd_bufaddr, FEC_ENET_TX_FRSIZE, DMA_TO_DEVICE);
                bdp->cbd_bufaddr = 0;

                skb = fep->tx_skbuff[fep->skb_dirty];
                /* Check for errors. */
                if (status & (BD_ENET_TX_HB | BD_ENET_TX_LC |
                                   BD_ENET_TX_RL | BD_ENET_TX_UN |
                                   BD_ENET_TX_CSL)) {
                        dev->stats.tx_errors++;
                        if (status & BD_ENET_TX_HB)  /* No heartbeat */
                                dev->stats.tx_heartbeat_errors++;
                        if (status & BD_ENET_TX_LC)  /* Late collision */
                                dev->stats.tx_window_errors++;
                        if (status & BD_ENET_TX_RL)  /* Retrans limit */
                                dev->stats.tx_aborted_errors++;
                        if (status & BD_ENET_TX_UN)  /* Underrun */
                                dev->stats.tx_fifo_errors++;
                        if (status & BD_ENET_TX_CSL) /* Carrier lost */
                                dev->stats.tx_carrier_errors++;
                } else {
                        dev->stats.tx_packets++;
                }

                if (status & BD_ENET_TX_READY)
                        printk("HEY! Enet xmit interrupt and TX_READY.\n");

                /* Deferred means some collisions occurred during transmit,
                 * but we eventually sent the packet OK.
                 */
                if (status & BD_ENET_TX_DEF)
                        dev->stats.collisions++;

                /* Free the sk buffer associated with this last transmit */
                dev_kfree_skb_any(skb);
                fep->tx_skbuff[fep->skb_dirty] = NULL;
                fep->skb_dirty = (fep->skb_dirty + 1) & TX_RING_MOD_MASK;

                /* Update pointer to next buffer descriptor to be transmitted */
                if (status & BD_ENET_TX_WRAP)
                        bdp = fep->tx_bd_base;
                else
                        bdp++;

                /* Since we have freed up a buffer, the ring is no longer full
                 */
                if (fep->tx_full) {
                        fep->tx_full = 0;
                        if (netif_queue_stopped(dev))
                                netif_wake_queue(dev);
                }
        }
        fep->dirty_tx = bdp;
        spin_unlock(&fep->hw_lock);
}


/* During a receive, the cur_rx points to the current incoming buffer.
 * When we update through the ring, if the next incoming buffer has
 * not been given to the system, we just set the empty indicator,
 * effectively tossing the packet.
 */
static void
fec_enet_rx(struct net_device *dev)
{
        struct  fec_enet_private *fep = netdev_priv(dev);
        struct bufdesc *bdp;
        unsigned short status;
        struct  sk_buff *skb;
        ushort  pkt_len;
        __u8 *data;

#ifdef CONFIG_M532x
        flush_cache_all();
#endif

        spin_lock(&fep->hw_lock);

        /* First, grab all of the stats for the incoming packet.
         * These get messed up if we get called due to a busy condition.
         */
        bdp = fep->cur_rx;

        while (!((status = bdp->cbd_sc) & BD_ENET_RX_EMPTY)) {

                /* Since we have allocated space to hold a complete frame,
                 * the last indicator should be set.
                 */
                if ((status & BD_ENET_RX_LAST) == 0)
                        printk("FEC ENET: rcv is not +last\n");

                if (!fep->opened)
                        goto rx_processing_done;

                /* Check for errors. */
                if (status & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_NO |
                           BD_ENET_RX_CR | BD_ENET_RX_OV)) {
                        dev->stats.rx_errors++;
                        if (status & (BD_ENET_RX_LG | BD_ENET_RX_SH)) {
                                /* Frame too long or too short. */
                                dev->stats.rx_length_errors++;
                        }
                        if (status & BD_ENET_RX_NO)     /* Frame alignment */
                                dev->stats.rx_frame_errors++;
                        if (status & BD_ENET_RX_CR)     /* CRC Error */
                                dev->stats.rx_crc_errors++;
                        if (status & BD_ENET_RX_OV)     /* FIFO overrun */
                                dev->stats.rx_fifo_errors++;
                }

                /* Report late collisions as a frame error.
                 * On this error, the BD is closed, but we don't know what we
                 * have in the buffer.  So, just drop this frame on the floor.
                 */
                if (status & BD_ENET_RX_CL) {
                        dev->stats.rx_errors++;
                        dev->stats.rx_frame_errors++;
                        goto rx_processing_done;
                }

                /* Process the incoming frame. */
                dev->stats.rx_packets++;
                pkt_len = bdp->cbd_datlen;
                dev->stats.rx_bytes += pkt_len;
                data = (__u8*)__va(bdp->cbd_bufaddr);

                dma_unmap_single(NULL, bdp->cbd_bufaddr, bdp->cbd_datlen,
                                DMA_FROM_DEVICE);

                /* This does 16 byte alignment, exactly what we need.
                 * The packet length includes FCS, but we don't want to
                 * include that when passing upstream as it messes up
                 * bridging applications.
                 */
                skb = dev_alloc_skb(pkt_len - 4 + NET_IP_ALIGN);

                if (unlikely(!skb)) {
                        printk("%s: Memory squeeze, dropping packet.\n",
                                        dev->name);
                        dev->stats.rx_dropped++;
                } else {
                        skb_reserve(skb, NET_IP_ALIGN);
                        skb_put(skb, pkt_len - 4);      /* Make room */
                        skb_copy_to_linear_data(skb, data, pkt_len - 4);
                        skb->protocol = eth_type_trans(skb, dev);
                        netif_rx(skb);
                }

                bdp->cbd_bufaddr = dma_map_single(NULL, data, bdp->cbd_datlen,
                        DMA_FROM_DEVICE);
rx_processing_done:
                /* Clear the status flags for this buffer */
                status &= ~BD_ENET_RX_STATS;

                /* Mark the buffer empty */
                status |= BD_ENET_RX_EMPTY;
                bdp->cbd_sc = status;

                /* Update BD pointer to next entry */
                if (status & BD_ENET_RX_WRAP)
                        bdp = fep->rx_bd_base;
                else
                        bdp++;
                /* Doing this here will keep the FEC running while we process
                 * incoming frames.  On a heavily loaded network, we should be
                 * able to keep up at the expense of system resources.
                 */
                writel(0, fep->hwp + FEC_R_DES_ACTIVE);
        }
        fep->cur_rx = bdp;

        spin_unlock(&fep->hw_lock);
}

/* called from interrupt context */
static void
fec_enet_mii(struct net_device *dev)
{
        struct  fec_enet_private *fep;
        mii_list_t      *mip;

        fep = netdev_priv(dev);
        spin_lock(&fep->mii_lock);

        if ((mip = mii_head) == NULL) {
                printk("MII and no head!\n");
                goto unlock;
        }

        if (mip->mii_func != NULL)
                (*(mip->mii_func))(readl(fep->hwp + FEC_MII_DATA), dev);

        mii_head = mip->mii_next;
        mip->mii_next = mii_free;
        mii_free = mip;

        if ((mip = mii_head) != NULL)
                writel(mip->mii_regval, fep->hwp + FEC_MII_DATA);

unlock:
        spin_unlock(&fep->mii_lock);
}

static int
mii_queue_unlocked(struct net_device *dev, int regval,
                void (*func)(uint, struct net_device *))
{
        struct fec_enet_private *fep;
        mii_list_t      *mip;
        int             retval;

        /* Add PHY address to register command */
        fep = netdev_priv(dev);

        regval |= fep->phy_addr << 23;
        retval = 0;

        if ((mip = mii_free) != NULL) {
                mii_free = mip->mii_next;
                mip->mii_regval = regval;
                mip->mii_func = func;
                mip->mii_next = NULL;
                if (mii_head) {
                        mii_tail->mii_next = mip;
                        mii_tail = mip;
                } else {
                        mii_head = mii_tail = mip;
                        writel(regval, fep->hwp + FEC_MII_DATA);
                }
        } else {
                retval = 1;
        }

        return retval;
}

static int
mii_queue(struct net_device *dev, int regval,
                void (*func)(uint, struct net_device *))
{
        struct fec_enet_private *fep;
        unsigned long   flags;
        int             retval;
        fep = netdev_priv(dev);
        spin_lock_irqsave(&fep->mii_lock, flags);
        retval = mii_queue_unlocked(dev, regval, func);
        spin_unlock_irqrestore(&fep->mii_lock, flags);
        return retval;
}

static void mii_do_cmd(struct net_device *dev, const phy_cmd_t *c)
{
        if(!c)
                return;

        for (; c->mii_data != mk_mii_end; c++)
                mii_queue(dev, c->mii_data, c->funct);
}

static void mii_parse_sr(uint mii_reg, struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);
        volatile uint *s = &(fep->phy_status);
        uint status;

        status = *s & ~(PHY_STAT_LINK | PHY_STAT_FAULT | PHY_STAT_ANC);

        if (mii_reg & 0x0004)
                status |= PHY_STAT_LINK;
        if (mii_reg & 0x0010)
                status |= PHY_STAT_FAULT;
        if (mii_reg & 0x0020)
                status |= PHY_STAT_ANC;
        *s = status;
}

static void mii_parse_cr(uint mii_reg, struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);
        volatile uint *s = &(fep->phy_status);
        uint status;

        status = *s & ~(PHY_CONF_ANE | PHY_CONF_LOOP);

        if (mii_reg & 0x1000)
                status |= PHY_CONF_ANE;
        if (mii_reg & 0x4000)
                status |= PHY_CONF_LOOP;
        *s = status;
}

static void mii_parse_anar(uint mii_reg, struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);
        volatile uint *s = &(fep->phy_status);
        uint status;

        status = *s & ~(PHY_CONF_SPMASK);

        if (mii_reg & 0x0020)
                status |= PHY_CONF_10HDX;
        if (mii_reg & 0x0040)
                status |= PHY_CONF_10FDX;
        if (mii_reg & 0x0080)
                status |= PHY_CONF_100HDX;
        if (mii_reg & 0x00100)
                status |= PHY_CONF_100FDX;
        *s = status;
}

/* ------------------------------------------------------------------------- */
/* The Level one LXT970 is used by many boards                               */

#define MII_LXT970_MIRROR    16  /* Mirror register           */
#define MII_LXT970_IER       17  /* Interrupt Enable Register */
#define MII_LXT970_ISR       18  /* Interrupt Status Register */
#define MII_LXT970_CONFIG    19  /* Configuration Register    */
#define MII_LXT970_CSR       20  /* Chip Status Register      */

static void mii_parse_lxt970_csr(uint mii_reg, struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);
        volatile uint *s = &(fep->phy_status);
        uint status;

        status = *s & ~(PHY_STAT_SPMASK);
        if (mii_reg & 0x0800) {
                if (mii_reg & 0x1000)
                        status |= PHY_STAT_100FDX;
                else
                        status |= PHY_STAT_100HDX;
        } else {
                if (mii_reg & 0x1000)
                        status |= PHY_STAT_10FDX;
                else
                        status |= PHY_STAT_10HDX;
        }
        *s = status;
}

static phy_cmd_t const phy_cmd_lxt970_config[] = {
                { mk_mii_read(MII_REG_CR), mii_parse_cr },
                { mk_mii_read(MII_REG_ANAR), mii_parse_anar },
                { mk_mii_end, }
        };
static phy_cmd_t const phy_cmd_lxt970_startup[] = { /* enable interrupts */
                { mk_mii_write(MII_LXT970_IER, 0x0002), NULL },
                { mk_mii_write(MII_REG_CR, 0x1200), NULL }, /* autonegotiate */
                { mk_mii_end, }
        };
static phy_cmd_t const phy_cmd_lxt970_ack_int[] = {
                /* read SR and ISR to acknowledge */
                { mk_mii_read(MII_REG_SR), mii_parse_sr },
                { mk_mii_read(MII_LXT970_ISR), NULL },

                /* find out the current status */
                { mk_mii_read(MII_LXT970_CSR), mii_parse_lxt970_csr },
                { mk_mii_end, }
        };
static phy_cmd_t const phy_cmd_lxt970_shutdown[] = { /* disable interrupts */
                { mk_mii_write(MII_LXT970_IER, 0x0000), NULL },
                { mk_mii_end, }
        };
static phy_info_t const phy_info_lxt970 = {
        .id = 0x07810000,
        .name = "LXT970",
        .config = phy_cmd_lxt970_config,
        .startup = phy_cmd_lxt970_startup,
        .ack_int = phy_cmd_lxt970_ack_int,
        .shutdown = phy_cmd_lxt970_shutdown
};

/* ------------------------------------------------------------------------- */
/* The Level one LXT971 is used on some of my custom boards                  */

/* register definitions for the 971 */

#define MII_LXT971_PCR       16  /* Port Control Register     */
#define MII_LXT971_SR2       17  /* Status Register 2         */
#define MII_LXT971_IER       18  /* Interrupt Enable Register */
#define MII_LXT971_ISR       19  /* Interrupt Status Register */
#define MII_LXT971_LCR       20  /* LED Control Register      */
#define MII_LXT971_TCR       30  /* Transmit Control Register */

/*
 * I had some nice ideas of running the MDIO faster...
 * The 971 should support 8MHz and I tried it, but things acted really
 * weird, so 2.5 MHz ought to be enough for anyone...
 */

static void mii_parse_lxt971_sr2(uint mii_reg, struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);
        volatile uint *s = &(fep->phy_status);
        uint status;

        status = *s & ~(PHY_STAT_SPMASK | PHY_STAT_LINK | PHY_STAT_ANC);

        if (mii_reg & 0x0400) {
                fep->link = 1;
                status |= PHY_STAT_LINK;
        } else {
                fep->link = 0;
        }
        if (mii_reg & 0x0080)
                status |= PHY_STAT_ANC;
        if (mii_reg & 0x4000) {
                if (mii_reg & 0x0200)
                        status |= PHY_STAT_100FDX;
                else
                        status |= PHY_STAT_100HDX;
        } else {
                if (mii_reg & 0x0200)
                        status |= PHY_STAT_10FDX;
                else
                        status |= PHY_STAT_10HDX;
        }
        if (mii_reg & 0x0008)
                status |= PHY_STAT_FAULT;

        *s = status;
}

static phy_cmd_t const phy_cmd_lxt971_config[] = {
                /* limit to 10MBit because my prototype board
                 * doesn't work with 100. */
                { mk_mii_read(MII_REG_CR), mii_parse_cr },
                { mk_mii_read(MII_REG_ANAR), mii_parse_anar },
                { mk_mii_read(MII_LXT971_SR2), mii_parse_lxt971_sr2 },
                { mk_mii_end, }
        };
static phy_cmd_t const phy_cmd_lxt971_startup[] = {  /* enable interrupts */
                { mk_mii_write(MII_LXT971_IER, 0x00f2), NULL },
                { mk_mii_write(MII_REG_CR, 0x1200), NULL }, /* autonegotiate */
                { mk_mii_write(MII_LXT971_LCR, 0xd422), NULL }, /* LED config */
                /* Somehow does the 971 tell me that the link is down
                 * the first read after power-up.
                 * read here to get a valid value in ack_int */
                { mk_mii_read(MII_REG_SR), mii_parse_sr },
                { mk_mii_end, }
        };
static phy_cmd_t const phy_cmd_lxt971_ack_int[] = {
                /* acknowledge the int before reading status ! */
                { mk_mii_read(MII_LXT971_ISR), NULL },
                /* find out the current status */
                { mk_mii_read(MII_REG_SR), mii_parse_sr },
                { mk_mii_read(MII_LXT971_SR2), mii_parse_lxt971_sr2 },
                { mk_mii_end, }
        };
static phy_cmd_t const phy_cmd_lxt971_shutdown[] = { /* disable interrupts */
                { mk_mii_write(MII_LXT971_IER, 0x0000), NULL },
                { mk_mii_end, }
        };
static phy_info_t const phy_info_lxt971 = {
        .id = 0x0001378e,
        .name = "LXT971",
        .config = phy_cmd_lxt971_config,
        .startup = phy_cmd_lxt971_startup,
        .ack_int = phy_cmd_lxt971_ack_int,
        .shutdown = phy_cmd_lxt971_shutdown
};

/* ------------------------------------------------------------------------- */
/* The Quality Semiconductor QS6612 is used on the RPX CLLF                  */

/* register definitions */

#define MII_QS6612_MCR       17  /* Mode Control Register      */
#define MII_QS6612_FTR       27  /* Factory Test Register      */
#define MII_QS6612_MCO       28  /* Misc. Control Register     */
#define MII_QS6612_ISR       29  /* Interrupt Source Register  */
#define MII_QS6612_IMR       30  /* Interrupt Mask Register    */
#define MII_QS6612_PCR       31  /* 100BaseTx PHY Control Reg. */

static void mii_parse_qs6612_pcr(uint mii_reg, struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);
        volatile uint *s = &(fep->phy_status);
        uint status;

        status = *s & ~(PHY_STAT_SPMASK);

        switch((mii_reg >> 2) & 7) {
        case 1: status |= PHY_STAT_10HDX; break;
        case 2: status |= PHY_STAT_100HDX; break;
        case 5: status |= PHY_STAT_10FDX; break;
        case 6: status |= PHY_STAT_100FDX; break;
}

        *s = status;
}

static phy_cmd_t const phy_cmd_qs6612_config[] = {
                /* The PHY powers up isolated on the RPX,
                 * so send a command to allow operation.
                 */
                { mk_mii_write(MII_QS6612_PCR, 0x0dc0), NULL },

                /* parse cr and anar to get some info */
                { mk_mii_read(MII_REG_CR), mii_parse_cr },
                { mk_mii_read(MII_REG_ANAR), mii_parse_anar },
                { mk_mii_end, }
        };
static phy_cmd_t const phy_cmd_qs6612_startup[] = {  /* enable interrupts */
                { mk_mii_write(MII_QS6612_IMR, 0x003a), NULL },
                { mk_mii_write(MII_REG_CR, 0x1200), NULL }, /* autonegotiate */
                { mk_mii_end, }
        };
static phy_cmd_t const phy_cmd_qs6612_ack_int[] = {
                /* we need to read ISR, SR and ANER to acknowledge */
                { mk_mii_read(MII_QS6612_ISR), NULL },
                { mk_mii_read(MII_REG_SR), mii_parse_sr },
                { mk_mii_read(MII_REG_ANER), NULL },

                /* read pcr to get info */
                { mk_mii_read(MII_QS6612_PCR), mii_parse_qs6612_pcr },
                { mk_mii_end, }
        };
static phy_cmd_t const phy_cmd_qs6612_shutdown[] = { /* disable interrupts */
                { mk_mii_write(MII_QS6612_IMR, 0x0000), NULL },
                { mk_mii_end, }
        };
static phy_info_t const phy_info_qs6612 = {
        .id = 0x00181440,
        .name = "QS6612",
        .config = phy_cmd_qs6612_config,
        .startup = phy_cmd_qs6612_startup,
        .ack_int = phy_cmd_qs6612_ack_int,
        .shutdown = phy_cmd_qs6612_shutdown
};

/* ------------------------------------------------------------------------- */
/* AMD AM79C874 phy                                                          */

/* register definitions for the 874 */

#define MII_AM79C874_MFR       16  /* Miscellaneous Feature Register */
#define MII_AM79C874_ICSR      17  /* Interrupt/Status Register      */
#define MII_AM79C874_DR        18  /* Diagnostic Register            */
#define MII_AM79C874_PMLR      19  /* Power and Loopback Register    */
#define MII_AM79C874_MCR       21  /* ModeControl Register           */
#define MII_AM79C874_DC        23  /* Disconnect Counter             */
#define MII_AM79C874_REC       24  /* Recieve Error Counter          */

static void mii_parse_am79c874_dr(uint mii_reg, struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);
        volatile uint *s = &(fep->phy_status);
        uint status;

        status = *s & ~(PHY_STAT_SPMASK | PHY_STAT_ANC);

        if (mii_reg & 0x0080)
                status |= PHY_STAT_ANC;
        if (mii_reg & 0x0400)
                status |= ((mii_reg & 0x0800) ? PHY_STAT_100FDX : PHY_STAT_100HDX);
        else
                status |= ((mii_reg & 0x0800) ? PHY_STAT_10FDX : PHY_STAT_10HDX);

        *s = status;
}

static phy_cmd_t const phy_cmd_am79c874_config[] = {
                { mk_mii_read(MII_REG_CR), mii_parse_cr },
                { mk_mii_read(MII_REG_ANAR), mii_parse_anar },
                { mk_mii_read(MII_AM79C874_DR), mii_parse_am79c874_dr },
                { mk_mii_end, }
        };
static phy_cmd_t const phy_cmd_am79c874_startup[] = {  /* enable interrupts */
                { mk_mii_write(MII_AM79C874_ICSR, 0xff00), NULL },
                { mk_mii_write(MII_REG_CR, 0x1200), NULL }, /* autonegotiate */
                { mk_mii_read(MII_REG_SR), mii_parse_sr },
                { mk_mii_end, }
        };
static phy_cmd_t const phy_cmd_am79c874_ack_int[] = {
                /* find out the current status */
                { mk_mii_read(MII_REG_SR), mii_parse_sr },
                { mk_mii_read(MII_AM79C874_DR), mii_parse_am79c874_dr },
                /* we only need to read ISR to acknowledge */
                { mk_mii_read(MII_AM79C874_ICSR), NULL },
                { mk_mii_end, }
        };
static phy_cmd_t const phy_cmd_am79c874_shutdown[] = { /* disable interrupts */
                { mk_mii_write(MII_AM79C874_ICSR, 0x0000), NULL },
                { mk_mii_end, }
        };
static phy_info_t const phy_info_am79c874 = {
        .id = 0x00022561,
        .name = "AM79C874",
        .config = phy_cmd_am79c874_config,
        .startup = phy_cmd_am79c874_startup,
        .ack_int = phy_cmd_am79c874_ack_int,
        .shutdown = phy_cmd_am79c874_shutdown
};


/* ------------------------------------------------------------------------- */
/* Kendin KS8721BL phy                                                       */

/* register definitions for the 8721 */

#define MII_KS8721BL_RXERCR     21
#define MII_KS8721BL_ICSR       27
#define MII_KS8721BL_PHYCR      31

static phy_cmd_t const phy_cmd_ks8721bl_config[] = {
                { mk_mii_read(MII_REG_CR), mii_parse_cr },
                { mk_mii_read(MII_REG_ANAR), mii_parse_anar },
                { mk_mii_end, }
        };
static phy_cmd_t const phy_cmd_ks8721bl_startup[] = {  /* enable interrupts */
                { mk_mii_write(MII_KS8721BL_ICSR, 0xff00), NULL },
                { mk_mii_write(MII_REG_CR, 0x1200), NULL }, /* autonegotiate */
                { mk_mii_read(MII_REG_SR), mii_parse_sr },
                { mk_mii_end, }
        };
static phy_cmd_t const phy_cmd_ks8721bl_ack_int[] = {
                /* find out the current status */
                { mk_mii_read(MII_REG_SR), mii_parse_sr },
                /* we only need to read ISR to acknowledge */
                { mk_mii_read(MII_KS8721BL_ICSR), NULL },
                { mk_mii_end, }
        };
static phy_cmd_t const phy_cmd_ks8721bl_shutdown[] = { /* disable interrupts */
                { mk_mii_write(MII_KS8721BL_ICSR, 0x0000), NULL },
                { mk_mii_end, }
        };
static phy_info_t const phy_info_ks8721bl = {
        .id = 0x00022161,
        .name = "KS8721BL",
        .config = phy_cmd_ks8721bl_config,
        .startup = phy_cmd_ks8721bl_startup,
        .ack_int = phy_cmd_ks8721bl_ack_int,
        .shutdown = phy_cmd_ks8721bl_shutdown
};

/* ------------------------------------------------------------------------- */
/* register definitions for the DP83848 */

#define MII_DP8384X_PHYSTST    16  /* PHY Status Register */

static void mii_parse_dp8384x_sr2(uint mii_reg, struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);
        volatile uint *s = &(fep->phy_status);

        *s &= ~(PHY_STAT_SPMASK | PHY_STAT_LINK | PHY_STAT_ANC);

        /* Link up */
        if (mii_reg & 0x0001) {
                fep->link = 1;
                *s |= PHY_STAT_LINK;
        } else
                fep->link = 0;
        /* Status of link */
        if (mii_reg & 0x0010)   /* Autonegotioation complete */
                *s |= PHY_STAT_ANC;
        if (mii_reg & 0x0002) {   /* 10MBps? */
                if (mii_reg & 0x0004)   /* Full Duplex? */
                        *s |= PHY_STAT_10FDX;
                else
                        *s |= PHY_STAT_10HDX;
        } else {                  /* 100 Mbps? */
                if (mii_reg & 0x0004)   /* Full Duplex? */
                        *s |= PHY_STAT_100FDX;
                else
                        *s |= PHY_STAT_100HDX;
        }
        if (mii_reg & 0x0008)
                *s |= PHY_STAT_FAULT;
}

static phy_info_t phy_info_dp83848= {
        0x020005c9,
        "DP83848",

        (const phy_cmd_t []) {  /* config */
                { mk_mii_read(MII_REG_CR), mii_parse_cr },
                { mk_mii_read(MII_REG_ANAR), mii_parse_anar },
                { mk_mii_read(MII_DP8384X_PHYSTST), mii_parse_dp8384x_sr2 },
                { mk_mii_end, }
        },
        (const phy_cmd_t []) {  /* startup - enable interrupts */
                { mk_mii_write(MII_REG_CR, 0x1200), NULL }, /* autonegotiate */
                { mk_mii_read(MII_REG_SR), mii_parse_sr },
                { mk_mii_end, }
        },
        (const phy_cmd_t []) { /* ack_int - never happens, no interrupt */
                { mk_mii_end, }
        },
        (const phy_cmd_t []) {  /* shutdown */
                { mk_mii_end, }
        },
};

/* ------------------------------------------------------------------------- */

static phy_info_t const * const phy_info[] = {
        &phy_info_lxt970,
        &phy_info_lxt971,
        &phy_info_qs6612,
        &phy_info_am79c874,
        &phy_info_ks8721bl,
        &phy_info_dp83848,
        NULL
};

/* ------------------------------------------------------------------------- */
#ifdef HAVE_mii_link_interrupt
static irqreturn_t
mii_link_interrupt(int irq, void * dev_id);

/*
 *      This is specific to the MII interrupt setup of the M5272EVB.
 */
static void __inline__ fec_request_mii_intr(struct net_device *dev)
{
        if (request_irq(66, mii_link_interrupt, IRQF_DISABLED, "fec(MII)", dev) != 0)
                printk("FEC: Could not allocate fec(MII) IRQ(66)!\n");
}

static void __inline__ fec_disable_phy_intr(struct net_device *dev)
{
        free_irq(66, dev);
}
#endif

#ifdef CONFIG_M5272
static void __inline__ fec_get_mac(struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);
        unsigned char *iap, tmpaddr[ETH_ALEN];

        if (FEC_FLASHMAC) {
                /*
                 * Get MAC address from FLASH.
                 * If it is all 1's or 0's, use the default.
                 */
                iap = (unsigned char *)FEC_FLASHMAC;
                if ((iap[0] == 0) && (iap[1] == 0) && (iap[2] == 0) &&
                    (iap[3] == 0) && (iap[4] == 0) && (iap[5] == 0))
                        iap = fec_mac_default;
                if ((iap[0] == 0xff) && (iap[1] == 0xff) && (iap[2] == 0xff) &&
                    (iap[3] == 0xff) && (iap[4] == 0xff) && (iap[5] == 0xff))
                        iap = fec_mac_default;
        } else {
                *((unsigned long *) &tmpaddr[0]) = readl(fep->hwp + FEC_ADDR_LOW);
                *((unsigned short *) &tmpaddr[4]) = (readl(fep->hwp + FEC_ADDR_HIGH) >> 16);
                iap = &tmpaddr[0];
        }

        memcpy(dev->dev_addr, iap, ETH_ALEN);

        /* Adjust MAC if using default MAC address */
        if (iap == fec_mac_default)
                 dev->dev_addr[ETH_ALEN-1] = fec_mac_default[ETH_ALEN-1] + fep->index;
}
#endif

/* ------------------------------------------------------------------------- */

static void mii_display_status(struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);
        volatile uint *s = &(fep->phy_status);

        if (!fep->link && !fep->old_link) {
                /* Link is still down - don't print anything */
                return;
        }

        printk("%s: status: ", dev->name);

        if (!fep->link) {
                printk("link down");
        } else {
                printk("link up");

                switch(*s & PHY_STAT_SPMASK) {
                case PHY_STAT_100FDX: printk(", 100MBit Full Duplex"); break;
                case PHY_STAT_100HDX: printk(", 100MBit Half Duplex"); break;
                case PHY_STAT_10FDX: printk(", 10MBit Full Duplex"); break;
                case PHY_STAT_10HDX: printk(", 10MBit Half Duplex"); break;
                default:
                        printk(", Unknown speed/duplex");
                }

                if (*s & PHY_STAT_ANC)
                        printk(", auto-negotiation complete");
        }

        if (*s & PHY_STAT_FAULT)
                printk(", remote fault");

        printk(".\n");
}

static void mii_display_config(struct work_struct *work)
{
        struct fec_enet_private *fep = container_of(work, struct fec_enet_private, phy_task);
        struct net_device *dev = fep->netdev;
        uint status = fep->phy_status;

        /*
        ** When we get here, phy_task is already removed from
        ** the workqueue.  It is thus safe to allow to reuse it.
        */
        fep->mii_phy_task_queued = 0;
        printk("%s: config: auto-negotiation ", dev->name);

        if (status & PHY_CONF_ANE)
                printk("on");
        else
                printk("off");

        if (status & PHY_CONF_100FDX)
                printk(", 100FDX");
        if (status & PHY_CONF_100HDX)
                printk(", 100HDX");
        if (status & PHY_CONF_10FDX)
                printk(", 10FDX");
        if (status & PHY_CONF_10HDX)
                printk(", 10HDX");
        if (!(status & PHY_CONF_SPMASK))
                printk(", No speed/duplex selected?");

        if (status & PHY_CONF_LOOP)
                printk(", loopback enabled");

        printk(".\n");

        fep->sequence_done = 1;
}

static void mii_relink(struct work_struct *work)
{
        struct fec_enet_private *fep = container_of(work, struct fec_enet_private, phy_task);
        struct net_device *dev = fep->netdev;
        int duplex;

        /*
        ** When we get here, phy_task is already removed from
        ** the workqueue.  It is thus safe to allow to reuse it.
        */
        fep->mii_phy_task_queued = 0;
        fep->link = (fep->phy_status & PHY_STAT_LINK) ? 1 : 0;
        mii_display_status(dev);
        fep->old_link = fep->link;

        if (fep->link) {
                duplex = 0;
                if (fep->phy_status
                    & (PHY_STAT_100FDX | PHY_STAT_10FDX))
                        duplex = 1;
                fec_restart(dev, duplex);
        } else
                fec_stop(dev);
}

/* mii_queue_relink is called in interrupt context from mii_link_interrupt */
static void mii_queue_relink(uint mii_reg, struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);

        /*
         * We cannot queue phy_task twice in the workqueue.  It
         * would cause an endless loop in the workqueue.
         * Fortunately, if the last mii_relink entry has not yet been
         * executed now, it will do the job for the current interrupt,
         * which is just what we want.
         */
        if (fep->mii_phy_task_queued)
                return;

        fep->mii_phy_task_queued = 1;
        INIT_WORK(&fep->phy_task, mii_relink);
        schedule_work(&fep->phy_task);
}

/* mii_queue_config is called in interrupt context from fec_enet_mii */
static void mii_queue_config(uint mii_reg, struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);

        if (fep->mii_phy_task_queued)
                return;

        fep->mii_phy_task_queued = 1;
        INIT_WORK(&fep->phy_task, mii_display_config);
        schedule_work(&fep->phy_task);
}

phy_cmd_t const phy_cmd_relink[] = {
        { mk_mii_read(MII_REG_CR), mii_queue_relink },
        { mk_mii_end, }
        };
phy_cmd_t const phy_cmd_config[] = {
        { mk_mii_read(MII_REG_CR), mii_queue_config },
        { mk_mii_end, }
        };

/* Read remainder of PHY ID. */
static void
mii_discover_phy3(uint mii_reg, struct net_device *dev)
{
        struct fec_enet_private *fep;
        int i;

        fep = netdev_priv(dev);
        fep->phy_id |= (mii_reg & 0xffff);
        printk("fec: PHY @ 0x%x, ID 0x%08x", fep->phy_addr, fep->phy_id);

        for(i = 0; phy_info[i]; i++) {
                if(phy_info[i]->id == (fep->phy_id >> 4))
                        break;
        }

        if (phy_info[i])
                printk(" -- %s\n", phy_info[i]->name);
        else
                printk(" -- unknown PHY!\n");

        fep->phy = phy_info[i];
        fep->phy_id_done = 1;
}

/* Scan all of the MII PHY addresses looking for someone to respond
 * with a valid ID.  This usually happens quickly.
 */
static void
mii_discover_phy(uint mii_reg, struct net_device *dev)
{
        struct fec_enet_private *fep;
        uint phytype;

        fep = netdev_priv(dev);

        if (fep->phy_addr < 32) {
                if ((phytype = (mii_reg & 0xffff)) != 0xffff && phytype != 0) {

                        /* Got first part of ID, now get remainder */
                        fep->phy_id = phytype << 16;
                        mii_queue_unlocked(dev, mk_mii_read(MII_REG_PHYIR2),
                                                        mii_discover_phy3);
                } else {
                        fep->phy_addr++;
                        mii_queue_unlocked(dev, mk_mii_read(MII_REG_PHYIR1),
                                                        mii_discover_phy);
                }
        } else {
                printk("FEC: No PHY device found.\n");
                /* Disable external MII interface */
                writel(0, fep->hwp + FEC_MII_SPEED);
                fep->phy_speed = 0;
#ifdef HAVE_mii_link_interrupt
                fec_disable_phy_intr(dev);
#endif
        }
}

/* This interrupt occurs when the PHY detects a link change */
#ifdef HAVE_mii_link_interrupt
static irqreturn_t
mii_link_interrupt(int irq, void * dev_id)
{
        struct  net_device *dev = dev_id;
        struct fec_enet_private *fep = netdev_priv(dev);

        mii_do_cmd(dev, fep->phy->ack_int);
        mii_do_cmd(dev, phy_cmd_relink);  /* restart and display status */

        return IRQ_HANDLED;
}
#endif

static void fec_enet_free_buffers(struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);
        int i;
        struct sk_buff *skb;
        struct bufdesc  *bdp;

        bdp = fep->rx_bd_base;
        for (i = 0; i < RX_RING_SIZE; i++) {
                skb = fep->rx_skbuff[i];

                if (bdp->cbd_bufaddr)
                        dma_unmap_single(&dev->dev, bdp->cbd_bufaddr,
                                        FEC_ENET_RX_FRSIZE, DMA_FROM_DEVICE);
                if (skb)
                        dev_kfree_skb(skb);
                bdp++;
        }

        bdp = fep->tx_bd_base;
        for (i = 0; i < TX_RING_SIZE; i++)
                kfree(fep->tx_bounce[i]);
}

static int fec_enet_alloc_buffers(struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);
        int i;
        struct sk_buff *skb;
        struct bufdesc  *bdp;

        bdp = fep->rx_bd_base;
        for (i = 0; i < RX_RING_SIZE; i++) {
                skb = dev_alloc_skb(FEC_ENET_RX_FRSIZE);
                if (!skb) {
                        fec_enet_free_buffers(dev);
                        return -ENOMEM;
                }
                fep->rx_skbuff[i] = skb;

                bdp->cbd_bufaddr = dma_map_single(&dev->dev, skb->data,
                                FEC_ENET_RX_FRSIZE, DMA_FROM_DEVICE);
                bdp->cbd_sc = BD_ENET_RX_EMPTY;
                bdp++;
        }

        /* Set the last buffer to wrap. */
        bdp--;
        bdp->cbd_sc |= BD_SC_WRAP;

        bdp = fep->tx_bd_base;
        for (i = 0; i < TX_RING_SIZE; i++) {
                fep->tx_bounce[i] = kmalloc(FEC_ENET_TX_FRSIZE, GFP_KERNEL);

                bdp->cbd_sc = 0;
                bdp->cbd_bufaddr = 0;
                bdp++;
        }

        /* Set the last buffer to wrap. */
        bdp--;
        bdp->cbd_sc |= BD_SC_WRAP;

        return 0;
}

static int
fec_enet_open(struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);
        int ret;

        /* I should reset the ring buffers here, but I don't yet know
         * a simple way to do that.
         */

        ret = fec_enet_alloc_buffers(dev);
        if (ret)
                return ret;

        fep->sequence_done = 0;
        fep->link = 0;

        fec_restart(dev, 1);

        if (fep->phy) {
                mii_do_cmd(dev, fep->phy->ack_int);
                mii_do_cmd(dev, fep->phy->config);
                mii_do_cmd(dev, phy_cmd_config);  /* display configuration */

                /* Poll until the PHY tells us its configuration
                 * (not link state).
                 * Request is initiated by mii_do_cmd above, but answer
                 * comes by interrupt.
                 * This should take about 25 usec per register at 2.5 MHz,
                 * and we read approximately 5 registers.
                 */
                while(!fep->sequence_done)
                        schedule();

                mii_do_cmd(dev, fep->phy->startup);
        }

        /* Set the initial link state to true. A lot of hardware
         * based on this device does not implement a PHY interrupt,
         * so we are never notified of link change.
         */
        fep->link = 1;

        netif_start_queue(dev);
        fep->opened = 1;
        return 0;
}

static int
fec_enet_close(struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);

        /* Don't know what to do yet. */
        fep->opened = 0;
        netif_stop_queue(dev);
        fec_stop(dev);

        fec_enet_free_buffers(dev);

        return 0;
}

/* Set or clear the multicast filter for this adaptor.
 * Skeleton taken from sunlance driver.
 * The CPM Ethernet implementation allows Multicast as well as individual
 * MAC address filtering.  Some of the drivers check to make sure it is
 * a group multicast address, and discard those that are not.  I guess I
 * will do the same for now, but just remove the test if you want
 * individual filtering as well (do the upper net layers want or support
 * this kind of feature?).
 */

#define HASH_BITS       6               /* #bits in hash */
#define CRC32_POLY      0xEDB88320

static void set_multicast_list(struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);
        struct dev_mc_list *dmi;
        unsigned int i, j, bit, data, crc, tmp;
        unsigned char hash;

        if (dev->flags & IFF_PROMISC) {
                tmp = readl(fep->hwp + FEC_R_CNTRL);
                tmp |= 0x8;
                writel(tmp, fep->hwp + FEC_R_CNTRL);
                return;
        }

        tmp = readl(fep->hwp + FEC_R_CNTRL);
        tmp &= ~0x8;
        writel(tmp, fep->hwp + FEC_R_CNTRL);

        if (dev->flags & IFF_ALLMULTI) {
                /* Catch all multicast addresses, so set the
                 * filter to all 1's
                 */
                writel(0xffffffff, fep->hwp + FEC_GRP_HASH_TABLE_HIGH);
                writel(0xffffffff, fep->hwp + FEC_GRP_HASH_TABLE_LOW);

                return;
        }

        /* Clear filter and add the addresses in hash register
         */
        writel(0, fep->hwp + FEC_GRP_HASH_TABLE_HIGH);
        writel(0, fep->hwp + FEC_GRP_HASH_TABLE_LOW);

        dmi = dev->mc_list;

        for (j = 0; j < dev->mc_count; j++, dmi = dmi->next) {
                /* Only support group multicast for now */
                if (!(dmi->dmi_addr[0] & 1))
                        continue;

                /* calculate crc32 value of mac address */
                crc = 0xffffffff;

                for (i = 0; i < dmi->dmi_addrlen; i++) {
                        data = dmi->dmi_addr[i];
                        for (bit = 0; bit < 8; bit++, data >>= 1) {
                                crc = (crc >> 1) ^
                                (((crc ^ data) & 1) ? CRC32_POLY : 0);
                        }
                }

                /* only upper 6 bits (HASH_BITS) are used
                 * which point to specific bit in he hash registers
                 */
                hash = (crc >> (32 - HASH_BITS)) & 0x3f;

                if (hash > 31) {
                        tmp = readl(fep->hwp + FEC_GRP_HASH_TABLE_HIGH);
                        tmp |= 1 << (hash - 32);
                        writel(tmp, fep->hwp + FEC_GRP_HASH_TABLE_HIGH);
                } else {
                        tmp = readl(fep->hwp + FEC_GRP_HASH_TABLE_LOW);
                        tmp |= 1 << hash;
                        writel(tmp, fep->hwp + FEC_GRP_HASH_TABLE_LOW);
                }
        }
}

/* Set a MAC change in hardware. */
static int
fec_set_mac_address(struct net_device *dev, void *p)
{
        struct fec_enet_private *fep = netdev_priv(dev);
        struct sockaddr *addr = p;

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

        memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);

        writel(dev->dev_addr[3] | (dev->dev_addr[2] << 8) |
                (dev->dev_addr[1] << 16) | (dev->dev_addr[0] << 24),
                fep->hwp + FEC_ADDR_LOW);
        writel((dev->dev_addr[5] << 16) | (dev->dev_addr[4] << 24),
                fep + FEC_ADDR_HIGH);
        return 0;
}

static const struct net_device_ops fec_netdev_ops = {
        .ndo_open               = fec_enet_open,
        .ndo_stop               = fec_enet_close,
        .ndo_start_xmit         = fec_enet_start_xmit,
        .ndo_set_multicast_list = set_multicast_list,
        .ndo_change_mtu         = eth_change_mtu,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_tx_timeout         = fec_timeout,
        .ndo_set_mac_address    = fec_set_mac_address,
};

 /*
  * XXX:  We need to clean up on failure exits here.
  *
  * index is only used in legacy code
  */
int __init fec_enet_init(struct net_device *dev, int index)
{
        struct fec_enet_private *fep = netdev_priv(dev);
        struct bufdesc *cbd_base;
        int i;

        /* Allocate memory for buffer descriptors. */
        cbd_base = dma_alloc_coherent(NULL, PAGE_SIZE, &fep->bd_dma,
                        GFP_KERNEL);
        if (!cbd_base) {
                printk("FEC: allocate descriptor memory failed?\n");
                return -ENOMEM;
        }

        spin_lock_init(&fep->hw_lock);
        spin_lock_init(&fep->mii_lock);

        fep->index = index;
        fep->hwp = (void __iomem *)dev->base_addr;
        fep->netdev = dev;

        /* Set the Ethernet address */
#ifdef CONFIG_M5272
        fec_get_mac(dev);
#else
        {
                unsigned long l;
                l = readl(fep->hwp + FEC_ADDR_LOW);
                dev->dev_addr[0] = (unsigned char)((l & 0xFF000000) >> 24);
                dev->dev_addr[1] = (unsigned char)((l & 0x00FF0000) >> 16);
                dev->dev_addr[2] = (unsigned char)((l & 0x0000FF00) >> 8);
                dev->dev_addr[3] = (unsigned char)((l & 0x000000FF) >> 0);
                l = readl(fep->hwp + FEC_ADDR_HIGH);
                dev->dev_addr[4] = (unsigned char)((l & 0xFF000000) >> 24);
                dev->dev_addr[5] = (unsigned char)((l & 0x00FF0000) >> 16);
        }
#endif

        /* Set receive and transmit descriptor base. */
        fep->rx_bd_base = cbd_base;
        fep->tx_bd_base = cbd_base + RX_RING_SIZE;

#ifdef HAVE_mii_link_interrupt
        fec_request_mii_intr(dev);
#endif
        /* The FEC Ethernet specific entries in the device structure */
        dev->watchdog_timeo = TX_TIMEOUT;
        dev->netdev_ops = &fec_netdev_ops;

        for (i=0; i<NMII-1; i++)
                mii_cmds[i].mii_next = &mii_cmds[i+1];
        mii_free = mii_cmds;

        /* Set MII speed to 2.5 MHz */
        fep->phy_speed = ((((clk_get_rate(fep->clk) / 2 + 4999999)
                                        / 2500000) / 2) & 0x3F) << 1;
        fec_restart(dev, 0);

        /* Queue up command to detect the PHY and initialize the
         * remainder of the interface.
         */
        fep->phy_id_done = 0;
        fep->phy_addr = 0;
        mii_queue(dev, mk_mii_read(MII_REG_PHYIR1), mii_discover_phy);

        return 0;
}

/* This function is called to start or restart the FEC during a link
 * change.  This only happens when switching between half and full
 * duplex.
 */
static void
fec_restart(struct net_device *dev, int duplex)
{
        struct fec_enet_private *fep = netdev_priv(dev);
        struct bufdesc *bdp;
        int i;

        /* Whack a reset.  We should wait for this. */
        writel(1, fep->hwp + FEC_ECNTRL);
        udelay(10);

        /* Clear any outstanding interrupt. */
        writel(0xffc00000, fep->hwp + FEC_IEVENT);

        /* Reset all multicast. */
        writel(0, fep->hwp + FEC_GRP_HASH_TABLE_HIGH);
        writel(0, fep->hwp + FEC_GRP_HASH_TABLE_LOW);
#ifndef CONFIG_M5272
        writel(0, fep->hwp + FEC_HASH_TABLE_HIGH);
        writel(0, fep->hwp + FEC_HASH_TABLE_LOW);
#endif

        /* Set maximum receive buffer size. */
        writel(PKT_MAXBLR_SIZE, fep->hwp + FEC_R_BUFF_SIZE);

        /* Set receive and transmit descriptor base. */
        writel(fep->bd_dma, fep->hwp + FEC_R_DES_START);
        writel((unsigned long)fep->bd_dma + sizeof(struct bufdesc) * RX_RING_SIZE,
                        fep->hwp + FEC_X_DES_START);

        fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
        fep->cur_rx = fep->rx_bd_base;

        /* Reset SKB transmit buffers. */
        fep->skb_cur = fep->skb_dirty = 0;
        for (i = 0; i <= TX_RING_MOD_MASK; i++) {
                if (fep->tx_skbuff[i]) {
                        dev_kfree_skb_any(fep->tx_skbuff[i]);
                        fep->tx_skbuff[i] = NULL;
                }
        }

        /* Initialize the receive buffer descriptors. */
        bdp = fep->rx_bd_base;
        for (i = 0; i < RX_RING_SIZE; i++) {

                /* Initialize the BD for every fragment in the page. */
                bdp->cbd_sc = BD_ENET_RX_EMPTY;
                bdp++;
        }

        /* Set the last buffer to wrap */
        bdp--;
        bdp->cbd_sc |= BD_SC_WRAP;

        /* ...and the same for transmit */
        bdp = fep->tx_bd_base;
        for (i = 0; i < TX_RING_SIZE; i++) {

                /* Initialize the BD for every fragment in the page. */
                bdp->cbd_sc = 0;
                bdp->cbd_bufaddr = 0;
                bdp++;
        }

        /* Set the last buffer to wrap */
        bdp--;
        bdp->cbd_sc |= BD_SC_WRAP;

        /* Enable MII mode */
        if (duplex) {
                /* MII enable / FD enable */
                writel(OPT_FRAME_SIZE | 0x04, fep->hwp + FEC_R_CNTRL);
                writel(0x04, fep->hwp + FEC_X_CNTRL);
        } else {
                /* MII enable / No Rcv on Xmit */
                writel(OPT_FRAME_SIZE | 0x06, fep->hwp + FEC_R_CNTRL);
                writel(0x0, fep->hwp + FEC_X_CNTRL);
        }
        fep->full_duplex = duplex;

        /* Set MII speed */
        writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED);

        /* And last, enable the transmit and receive processing */
        writel(2, fep->hwp + FEC_ECNTRL);
        writel(0, fep->hwp + FEC_R_DES_ACTIVE);

        /* Enable interrupts we wish to service */
        writel(FEC_ENET_TXF | FEC_ENET_RXF | FEC_ENET_MII,
                        fep->hwp + FEC_IMASK);
}

static void
fec_stop(struct net_device *dev)
{
        struct fec_enet_private *fep = netdev_priv(dev);

        /* We cannot expect a graceful transmit stop without link !!! */
        if (fep->link) {
                writel(1, fep->hwp + FEC_X_CNTRL); /* Graceful transmit stop */
                udelay(10);
                if (!(readl(fep->hwp + FEC_IEVENT) & FEC_ENET_GRA))
                        printk("fec_stop : Graceful transmit stop did not complete !\n");
        }

        /* Whack a reset.  We should wait for this. */
        writel(1, fep->hwp + FEC_ECNTRL);
        udelay(10);

        /* Clear outstanding MII command interrupts. */
        writel(FEC_ENET_MII, fep->hwp + FEC_IEVENT);

        writel(FEC_ENET_MII, fep->hwp + FEC_IMASK);
        writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED);
}

static int __devinit
fec_probe(struct platform_device *pdev)
{
        struct fec_enet_private *fep;
        struct net_device *ndev;
        int i, irq, ret = 0;
        struct resource *r;

        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (!r)
                return -ENXIO;

        r = request_mem_region(r->start, resource_size(r), pdev->name);
        if (!r)
                return -EBUSY;

        /* Init network device */
        ndev = alloc_etherdev(sizeof(struct fec_enet_private));
        if (!ndev)
                return -ENOMEM;

        SET_NETDEV_DEV(ndev, &pdev->dev);

        /* setup board info structure */
        fep = netdev_priv(ndev);
        memset(fep, 0, sizeof(*fep));

        ndev->base_addr = (unsigned long)ioremap(r->start, resource_size(r));

        if (!ndev->base_addr) {
                ret = -ENOMEM;
                goto failed_ioremap;
        }

        platform_set_drvdata(pdev, ndev);

        /* This device has up to three irqs on some platforms */
        for (i = 0; i < 3; i++) {
                irq = platform_get_irq(pdev, i);
                if (i && irq < 0)
                        break;
                ret = request_irq(irq, fec_enet_interrupt, IRQF_DISABLED, pdev->name, ndev);
                if (ret) {
                        while (i >= 0) {
                                irq = platform_get_irq(pdev, i);
                                free_irq(irq, ndev);
                                i--;
                        }
                        goto failed_irq;
                }
        }

        fep->clk = clk_get(&pdev->dev, "fec_clk");
        if (IS_ERR(fep->clk)) {
                ret = PTR_ERR(fep->clk);
                goto failed_clk;
        }
        clk_enable(fep->clk);

        ret = fec_enet_init(ndev, 0);
        if (ret)
                goto failed_init;

        ret = register_netdev(ndev);
        if (ret)
                goto failed_register;

        return 0;

failed_register:
failed_init:
        clk_disable(fep->clk);
        clk_put(fep->clk);
failed_clk:
        for (i = 0; i < 3; i++) {
                irq = platform_get_irq(pdev, i);
                if (irq > 0)
                        free_irq(irq, ndev);
        }
failed_irq:
        iounmap((void __iomem *)ndev->base_addr);
failed_ioremap:
        free_netdev(ndev);

        return ret;
}

static int __devexit
fec_drv_remove(struct platform_device *pdev)
{
        struct net_device *ndev = platform_get_drvdata(pdev);
        struct fec_enet_private *fep = netdev_priv(ndev);

        platform_set_drvdata(pdev, NULL);

        fec_stop(ndev);
        clk_disable(fep->clk);
        clk_put(fep->clk);
        iounmap((void __iomem *)ndev->base_addr);
        unregister_netdev(ndev);
        free_netdev(ndev);
        return 0;
}

static int
fec_suspend(struct platform_device *dev, pm_message_t state)
{
        struct net_device *ndev = platform_get_drvdata(dev);
        struct fec_enet_private *fep;

        if (ndev) {
                fep = netdev_priv(ndev);
                if (netif_running(ndev)) {
                        netif_device_detach(ndev);
                        fec_stop(ndev);
                }
        }
        return 0;
}

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

        if (ndev) {
                if (netif_running(ndev)) {
                        fec_enet_init(ndev, 0);
                        netif_device_attach(ndev);
                }
        }
        return 0;
}

static struct platform_driver fec_driver = {
        .driver = {
                .name    = "fec",
                .owner   = THIS_MODULE,
        },
        .probe   = fec_probe,
        .remove  = __devexit_p(fec_drv_remove),
        .suspend = fec_suspend,
        .resume  = fec_resume,
};

static int __init
fec_enet_module_init(void)
{
        printk(KERN_INFO "FEC Ethernet Driver\n");

        return platform_driver_register(&fec_driver);
}

static void __exit
fec_enet_cleanup(void)
{
        platform_driver_unregister(&fec_driver);
}

module_exit(fec_enet_cleanup);
module_init(fec_enet_module_init);

MODULE_LICENSE("GPL");