Added missing tegra files.HEADmaster

1 files changed, 1196 insertions, 0 deletions

diff --git a/drivers/net/fs_enet/fs_enet-main.c b/drivers/net/fs_enet/fs_enet-main.c
new file mode 100644
index 00000000000..329ef231a09
--- /dev/null
+++ b/drivers/net/fs_enet/fs_enet-main.c
@@ -0,0 +1,1196 @@
+/*
+ * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
+ *
+ * Copyright (c) 2003 Intracom S.A.
+ *  by Pantelis Antoniou <panto@intracom.gr>
+ *
+ * 2005 (c) MontaVista Software, Inc.
+ * Vitaly Bordug <vbordug@ru.mvista.com>
+ *
+ * Heavily based on original FEC driver by Dan Malek <dan@embeddededge.com>
+ * and modifications by Joakim Tjernlund <joakim.tjernlund@lumentis.se>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.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/init.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/mii.h>
+#include <linux/ethtool.h>
+#include <linux/bitops.h>
+#include <linux/fs.h>
+#include <linux/platform_device.h>
+#include <linux/phy.h>
+#include <linux/of.h>
+#include <linux/of_mdio.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+#include <linux/of_net.h>
+
+#include <linux/vmalloc.h>
+#include <asm/pgtable.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+
+#include "fs_enet.h"
+
+/*************************************************/
+
+MODULE_AUTHOR("Pantelis Antoniou <panto@intracom.gr>");
+MODULE_DESCRIPTION("Freescale Ethernet Driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_MODULE_VERSION);
+
+static int fs_enet_debug = -1; /* -1 == use FS_ENET_DEF_MSG_ENABLE as value */
+module_param(fs_enet_debug, int, 0);
+MODULE_PARM_DESC(fs_enet_debug,
+                 "Freescale bitmapped debugging message enable value");
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void fs_enet_netpoll(struct net_device *dev);
+#endif
+
+static void fs_set_multicast_list(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+
+        (*fep->ops->set_multicast_list)(dev);
+}
+
+static void skb_align(struct sk_buff *skb, int align)
+{
+        int off = ((unsigned long)skb->data) & (align - 1);
+
+        if (off)
+                skb_reserve(skb, align - off);
+}
+
+/* NAPI receive function */
+static int fs_enet_rx_napi(struct napi_struct *napi, int budget)
+{
+        struct fs_enet_private *fep = container_of(napi, struct fs_enet_private, napi);
+        struct net_device *dev = fep->ndev;
+        const struct fs_platform_info *fpi = fep->fpi;
+        cbd_t __iomem *bdp;
+        struct sk_buff *skb, *skbn, *skbt;
+        int received = 0;
+        u16 pkt_len, sc;
+        int curidx;
+
+        /*
+         * 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;
+
+        /* clear RX status bits for napi*/
+        (*fep->ops->napi_clear_rx_event)(dev);
+
+        while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
+                curidx = bdp - fep->rx_bd_base;
+
+                /*
+                 * Since we have allocated space to hold a complete frame,
+                 * the last indicator should be set.
+                 */
+                if ((sc & BD_ENET_RX_LAST) == 0)
+                        dev_warn(fep->dev, "rcv is not +last\n");
+
+                /*
+                 * Check for errors.
+                 */
+                if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
+                          BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
+                        fep->stats.rx_errors++;
+                        /* Frame too long or too short. */
+                        if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
+                                fep->stats.rx_length_errors++;
+                        /* Frame alignment */
+                        if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
+                                fep->stats.rx_frame_errors++;
+                        /* CRC Error */
+                        if (sc & BD_ENET_RX_CR)
+                                fep->stats.rx_crc_errors++;
+                        /* FIFO overrun */
+                        if (sc & BD_ENET_RX_OV)
+                                fep->stats.rx_crc_errors++;
+
+                        skb = fep->rx_skbuff[curidx];
+
+                        dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
+                                L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
+                                DMA_FROM_DEVICE);
+
+                        skbn = skb;
+
+                } else {
+                        skb = fep->rx_skbuff[curidx];
+
+                        dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
+                                L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
+                                DMA_FROM_DEVICE);
+
+                        /*
+                         * Process the incoming frame.
+                         */
+                        fep->stats.rx_packets++;
+                        pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
+                        fep->stats.rx_bytes += pkt_len + 4;
+
+                        if (pkt_len <= fpi->rx_copybreak) {
+                                /* +2 to make IP header L1 cache aligned */
+                                skbn = dev_alloc_skb(pkt_len + 2);
+                                if (skbn != NULL) {
+                                        skb_reserve(skbn, 2);   /* align IP header */
+                                        skb_copy_from_linear_data(skb,
+                                                      skbn->data, pkt_len);
+                                        /* swap */
+                                        skbt = skb;
+                                        skb = skbn;
+                                        skbn = skbt;
+                                }
+                        } else {
+                                skbn = dev_alloc_skb(ENET_RX_FRSIZE);
+
+                                if (skbn)
+                                        skb_align(skbn, ENET_RX_ALIGN);
+                        }
+
+                        if (skbn != NULL) {
+                                skb_put(skb, pkt_len);  /* Make room */
+                                skb->protocol = eth_type_trans(skb, dev);
+                                received++;
+                                netif_receive_skb(skb);
+                        } else {
+                                dev_warn(fep->dev,
+                                         "Memory squeeze, dropping packet.\n");
+                                fep->stats.rx_dropped++;
+                                skbn = skb;
+                        }
+                }
+
+                fep->rx_skbuff[curidx] = skbn;
+                CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
+                             L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
+                             DMA_FROM_DEVICE));
+                CBDW_DATLEN(bdp, 0);
+                CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
+
+                /*
+                 * Update BD pointer to next entry.
+                 */
+                if ((sc & BD_ENET_RX_WRAP) == 0)
+                        bdp++;
+                else
+                        bdp = fep->rx_bd_base;
+
+                (*fep->ops->rx_bd_done)(dev);
+
+                if (received >= budget)
+                        break;
+        }
+
+        fep->cur_rx = bdp;
+
+        if (received < budget) {
+                /* done */
+                napi_complete(napi);
+                (*fep->ops->napi_enable_rx)(dev);
+        }
+        return received;
+}
+
+/* non NAPI receive function */
+static int fs_enet_rx_non_napi(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        const struct fs_platform_info *fpi = fep->fpi;
+        cbd_t __iomem *bdp;
+        struct sk_buff *skb, *skbn, *skbt;
+        int received = 0;
+        u16 pkt_len, sc;
+        int curidx;
+        /*
+         * 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 (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
+
+                curidx = bdp - fep->rx_bd_base;
+
+                /*
+                 * Since we have allocated space to hold a complete frame,
+                 * the last indicator should be set.
+                 */
+                if ((sc & BD_ENET_RX_LAST) == 0)
+                        dev_warn(fep->dev, "rcv is not +last\n");
+
+                /*
+                 * Check for errors.
+                 */
+                if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
+                          BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
+                        fep->stats.rx_errors++;
+                        /* Frame too long or too short. */
+                        if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
+                                fep->stats.rx_length_errors++;
+                        /* Frame alignment */
+                        if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
+                                fep->stats.rx_frame_errors++;
+                        /* CRC Error */
+                        if (sc & BD_ENET_RX_CR)
+                                fep->stats.rx_crc_errors++;
+                        /* FIFO overrun */
+                        if (sc & BD_ENET_RX_OV)
+                                fep->stats.rx_crc_errors++;
+
+                        skb = fep->rx_skbuff[curidx];
+
+                        dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
+                                L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
+                                DMA_FROM_DEVICE);
+
+                        skbn = skb;
+
+                } else {
+
+                        skb = fep->rx_skbuff[curidx];
+
+                        dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
+                                L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
+                                DMA_FROM_DEVICE);
+
+                        /*
+                         * Process the incoming frame.
+                         */
+                        fep->stats.rx_packets++;
+                        pkt_len = CBDR_DATLEN(bdp) - 4; /* remove CRC */
+                        fep->stats.rx_bytes += pkt_len + 4;
+
+                        if (pkt_len <= fpi->rx_copybreak) {
+                                /* +2 to make IP header L1 cache aligned */
+                                skbn = dev_alloc_skb(pkt_len + 2);
+                                if (skbn != NULL) {
+                                        skb_reserve(skbn, 2);   /* align IP header */
+                                        skb_copy_from_linear_data(skb,
+                                                      skbn->data, pkt_len);
+                                        /* swap */
+                                        skbt = skb;
+                                        skb = skbn;
+                                        skbn = skbt;
+                                }
+                        } else {
+                                skbn = dev_alloc_skb(ENET_RX_FRSIZE);
+
+                                if (skbn)
+                                        skb_align(skbn, ENET_RX_ALIGN);
+                        }
+
+                        if (skbn != NULL) {
+                                skb_put(skb, pkt_len);  /* Make room */
+                                skb->protocol = eth_type_trans(skb, dev);
+                                received++;
+                                netif_rx(skb);
+                        } else {
+                                dev_warn(fep->dev,
+                                         "Memory squeeze, dropping packet.\n");
+                                fep->stats.rx_dropped++;
+                                skbn = skb;
+                        }
+                }
+
+                fep->rx_skbuff[curidx] = skbn;
+                CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
+                             L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
+                             DMA_FROM_DEVICE));
+                CBDW_DATLEN(bdp, 0);
+                CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
+
+                /*
+                 * Update BD pointer to next entry.
+                 */
+                if ((sc & BD_ENET_RX_WRAP) == 0)
+                        bdp++;
+                else
+                        bdp = fep->rx_bd_base;
+
+                (*fep->ops->rx_bd_done)(dev);
+        }
+
+        fep->cur_rx = bdp;
+
+        return 0;
+}
+
+static void fs_enet_tx(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        cbd_t __iomem *bdp;
+        struct sk_buff *skb;
+        int dirtyidx, do_wake, do_restart;
+        u16 sc;
+
+        spin_lock(&fep->tx_lock);
+        bdp = fep->dirty_tx;
+
+        do_wake = do_restart = 0;
+        while (((sc = CBDR_SC(bdp)) & BD_ENET_TX_READY) == 0) {
+                dirtyidx = bdp - fep->tx_bd_base;
+
+                if (fep->tx_free == fep->tx_ring)
+                        break;
+
+                skb = fep->tx_skbuff[dirtyidx];
+
+                /*
+                 * Check for errors.
+                 */
+                if (sc & (BD_ENET_TX_HB | BD_ENET_TX_LC |
+                          BD_ENET_TX_RL | BD_ENET_TX_UN | BD_ENET_TX_CSL)) {
+
+                        if (sc & BD_ENET_TX_HB) /* No heartbeat */
+                                fep->stats.tx_heartbeat_errors++;
+                        if (sc & BD_ENET_TX_LC) /* Late collision */
+                                fep->stats.tx_window_errors++;
+                        if (sc & BD_ENET_TX_RL) /* Retrans limit */
+                                fep->stats.tx_aborted_errors++;
+                        if (sc & BD_ENET_TX_UN) /* Underrun */
+                                fep->stats.tx_fifo_errors++;
+                        if (sc & BD_ENET_TX_CSL)        /* Carrier lost */
+                                fep->stats.tx_carrier_errors++;
+
+                        if (sc & (BD_ENET_TX_LC | BD_ENET_TX_RL | BD_ENET_TX_UN)) {
+                                fep->stats.tx_errors++;
+                                do_restart = 1;
+                        }
+                } else
+                        fep->stats.tx_packets++;
+
+                if (sc & BD_ENET_TX_READY) {
+                        dev_warn(fep->dev,
+                                 "HEY! Enet xmit interrupt and TX_READY.\n");
+                }
+
+                /*
+                 * Deferred means some collisions occurred during transmit,
+                 * but we eventually sent the packet OK.
+                 */
+                if (sc & BD_ENET_TX_DEF)
+                        fep->stats.collisions++;
+
+                /* unmap */
+                dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
+                                skb->len, DMA_TO_DEVICE);
+
+                /*
+                 * Free the sk buffer associated with this last transmit.
+                 */
+                dev_kfree_skb_irq(skb);
+                fep->tx_skbuff[dirtyidx] = NULL;
+
+                /*
+                 * Update pointer to next buffer descriptor to be transmitted.
+                 */
+                if ((sc & BD_ENET_TX_WRAP) == 0)
+                        bdp++;
+                else
+                        bdp = fep->tx_bd_base;
+
+                /*
+                 * Since we have freed up a buffer, the ring is no longer
+                 * full.
+                 */
+                if (!fep->tx_free++)
+                        do_wake = 1;
+        }
+
+        fep->dirty_tx = bdp;
+
+        if (do_restart)
+                (*fep->ops->tx_restart)(dev);
+
+        spin_unlock(&fep->tx_lock);
+
+        if (do_wake)
+                netif_wake_queue(dev);
+}
+
+/*
+ * The interrupt handler.
+ * This is called from the MPC core interrupt.
+ */
+static irqreturn_t
+fs_enet_interrupt(int irq, void *dev_id)
+{
+        struct net_device *dev = dev_id;
+        struct fs_enet_private *fep;
+        const struct fs_platform_info *fpi;
+        u32 int_events;
+        u32 int_clr_events;
+        int nr, napi_ok;
+        int handled;
+
+        fep = netdev_priv(dev);
+        fpi = fep->fpi;
+
+        nr = 0;
+        while ((int_events = (*fep->ops->get_int_events)(dev)) != 0) {
+                nr++;
+
+                int_clr_events = int_events;
+                if (fpi->use_napi)
+                        int_clr_events &= ~fep->ev_napi_rx;
+
+                (*fep->ops->clear_int_events)(dev, int_clr_events);
+
+                if (int_events & fep->ev_err)
+                        (*fep->ops->ev_error)(dev, int_events);
+
+                if (int_events & fep->ev_rx) {
+                        if (!fpi->use_napi)
+                                fs_enet_rx_non_napi(dev);
+                        else {
+                                napi_ok = napi_schedule_prep(&fep->napi);
+
+                                (*fep->ops->napi_disable_rx)(dev);
+                                (*fep->ops->clear_int_events)(dev, fep->ev_napi_rx);
+
+                                /* NOTE: it is possible for FCCs in NAPI mode    */
+                                /* to submit a spurious interrupt while in poll  */
+                                if (napi_ok)
+                                        __napi_schedule(&fep->napi);
+                        }
+                }
+
+                if (int_events & fep->ev_tx)
+                        fs_enet_tx(dev);
+        }
+
+        handled = nr > 0;
+        return IRQ_RETVAL(handled);
+}
+
+void fs_init_bds(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        cbd_t __iomem *bdp;
+        struct sk_buff *skb;
+        int i;
+
+        fs_cleanup_bds(dev);
+
+        fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
+        fep->tx_free = fep->tx_ring;
+        fep->cur_rx = fep->rx_bd_base;
+
+        /*
+         * Initialize the receive buffer descriptors.
+         */
+        for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
+                skb = dev_alloc_skb(ENET_RX_FRSIZE);
+                if (skb == NULL) {
+                        dev_warn(fep->dev,
+                                 "Memory squeeze, unable to allocate skb\n");
+                        break;
+                }
+                skb_align(skb, ENET_RX_ALIGN);
+                fep->rx_skbuff[i] = skb;
+                CBDW_BUFADDR(bdp,
+                        dma_map_single(fep->dev, skb->data,
+                                L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
+                                DMA_FROM_DEVICE));
+                CBDW_DATLEN(bdp, 0);    /* zero */
+                CBDW_SC(bdp, BD_ENET_RX_EMPTY |
+                        ((i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP));
+        }
+        /*
+         * if we failed, fillup remainder
+         */
+        for (; i < fep->rx_ring; i++, bdp++) {
+                fep->rx_skbuff[i] = NULL;
+                CBDW_SC(bdp, (i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP);
+        }
+
+        /*
+         * ...and the same for transmit.
+         */
+        for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
+                fep->tx_skbuff[i] = NULL;
+                CBDW_BUFADDR(bdp, 0);
+                CBDW_DATLEN(bdp, 0);
+                CBDW_SC(bdp, (i < fep->tx_ring - 1) ? 0 : BD_SC_WRAP);
+        }
+}
+
+void fs_cleanup_bds(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        struct sk_buff *skb;
+        cbd_t __iomem *bdp;
+        int i;
+
+        /*
+         * Reset SKB transmit buffers.
+         */
+        for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
+                if ((skb = fep->tx_skbuff[i]) == NULL)
+                        continue;
+
+                /* unmap */
+                dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
+                                skb->len, DMA_TO_DEVICE);
+
+                fep->tx_skbuff[i] = NULL;
+                dev_kfree_skb(skb);
+        }
+
+        /*
+         * Reset SKB receive buffers
+         */
+        for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
+                if ((skb = fep->rx_skbuff[i]) == NULL)
+                        continue;
+
+                /* unmap */
+                dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
+                        L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
+                        DMA_FROM_DEVICE);
+
+                fep->rx_skbuff[i] = NULL;
+
+                dev_kfree_skb(skb);
+        }
+}
+
+/**********************************************************************************/
+
+#ifdef CONFIG_FS_ENET_MPC5121_FEC
+/*
+ * MPC5121 FEC requeries 4-byte alignment for TX data buffer!
+ */
+static struct sk_buff *tx_skb_align_workaround(struct net_device *dev,
+                                               struct sk_buff *skb)
+{
+        struct sk_buff *new_skb;
+        struct fs_enet_private *fep = netdev_priv(dev);
+
+        /* Alloc new skb */
+        new_skb = dev_alloc_skb(skb->len + 4);
+        if (!new_skb) {
+                if (net_ratelimit()) {
+                        dev_warn(fep->dev,
+                                 "Memory squeeze, dropping tx packet.\n");
+                }
+                return NULL;
+        }
+
+        /* Make sure new skb is properly aligned */
+        skb_align(new_skb, 4);
+
+        /* Copy data to new skb ... */
+        skb_copy_from_linear_data(skb, new_skb->data, skb->len);
+        skb_put(new_skb, skb->len);
+
+        /* ... and free an old one */
+        dev_kfree_skb_any(skb);
+
+        return new_skb;
+}
+#endif
+
+static int fs_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        cbd_t __iomem *bdp;
+        int curidx;
+        u16 sc;
+        unsigned long flags;
+
+#ifdef CONFIG_FS_ENET_MPC5121_FEC
+        if (((unsigned long)skb->data) & 0x3) {
+                skb = tx_skb_align_workaround(dev, skb);
+                if (!skb) {
+                        /*
+                         * We have lost packet due to memory allocation error
+                         * in tx_skb_align_workaround(). Hopefully original
+                         * skb is still valid, so try transmit it later.
+                         */
+                        return NETDEV_TX_BUSY;
+                }
+        }
+#endif
+        spin_lock_irqsave(&fep->tx_lock, flags);
+
+        /*
+         * Fill in a Tx ring entry
+         */
+        bdp = fep->cur_tx;
+
+        if (!fep->tx_free || (CBDR_SC(bdp) & BD_ENET_TX_READY)) {
+                netif_stop_queue(dev);
+                spin_unlock_irqrestore(&fep->tx_lock, flags);
+
+                /*
+                 * Ooops.  All transmit buffers are full.  Bail out.
+                 * This should not happen, since the tx queue should be stopped.
+                 */
+                dev_warn(fep->dev, "tx queue full!.\n");
+                return NETDEV_TX_BUSY;
+        }
+
+        curidx = bdp - fep->tx_bd_base;
+        /*
+         * Clear all of the status flags.
+         */
+        CBDC_SC(bdp, BD_ENET_TX_STATS);
+
+        /*
+         * Save skb pointer.
+         */
+        fep->tx_skbuff[curidx] = skb;
+
+        fep->stats.tx_bytes += skb->len;
+
+        /*
+         * Push the data cache so the CPM does not get stale memory data.
+         */
+        CBDW_BUFADDR(bdp, dma_map_single(fep->dev,
+                                skb->data, skb->len, DMA_TO_DEVICE));
+        CBDW_DATLEN(bdp, skb->len);
+
+        /*
+         * If this was the last BD in the ring, start at the beginning again.
+         */
+        if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0)
+                fep->cur_tx++;
+        else
+                fep->cur_tx = fep->tx_bd_base;
+
+        if (!--fep->tx_free)
+                netif_stop_queue(dev);
+
+        /* Trigger transmission start */
+        sc = BD_ENET_TX_READY | BD_ENET_TX_INTR |
+             BD_ENET_TX_LAST | BD_ENET_TX_TC;
+
+        /* note that while FEC does not have this bit
+         * it marks it as available for software use
+         * yay for hw reuse :) */
+        if (skb->len <= 60)
+                sc |= BD_ENET_TX_PAD;
+        CBDS_SC(bdp, sc);
+
+        skb_tx_timestamp(skb);
+
+        (*fep->ops->tx_kickstart)(dev);
+
+        spin_unlock_irqrestore(&fep->tx_lock, flags);
+
+        return NETDEV_TX_OK;
+}
+
+static void fs_timeout(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        unsigned long flags;
+        int wake = 0;
+
+        fep->stats.tx_errors++;
+
+        spin_lock_irqsave(&fep->lock, flags);
+
+        if (dev->flags & IFF_UP) {
+                phy_stop(fep->phydev);
+                (*fep->ops->stop)(dev);
+                (*fep->ops->restart)(dev);
+                phy_start(fep->phydev);
+        }
+
+        phy_start(fep->phydev);
+        wake = fep->tx_free && !(CBDR_SC(fep->cur_tx) & BD_ENET_TX_READY);
+        spin_unlock_irqrestore(&fep->lock, flags);
+
+        if (wake)
+                netif_wake_queue(dev);
+}
+
+/*-----------------------------------------------------------------------------
+ *  generic link-change handler - should be sufficient for most cases
+ *-----------------------------------------------------------------------------*/
+static void generic_adjust_link(struct  net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        struct phy_device *phydev = fep->phydev;
+        int new_state = 0;
+
+        if (phydev->link) {
+                /* adjust to duplex mode */
+                if (phydev->duplex != fep->oldduplex) {
+                        new_state = 1;
+                        fep->oldduplex = phydev->duplex;
+                }
+
+                if (phydev->speed != fep->oldspeed) {
+                        new_state = 1;
+                        fep->oldspeed = phydev->speed;
+                }
+
+                if (!fep->oldlink) {
+                        new_state = 1;
+                        fep->oldlink = 1;
+                }
+
+                if (new_state)
+                        fep->ops->restart(dev);
+        } else if (fep->oldlink) {
+                new_state = 1;
+                fep->oldlink = 0;
+                fep->oldspeed = 0;
+                fep->oldduplex = -1;
+        }
+
+        if (new_state && netif_msg_link(fep))
+                phy_print_status(phydev);
+}
+
+
+static void fs_adjust_link(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        unsigned long flags;
+
+        spin_lock_irqsave(&fep->lock, flags);
+
+        if(fep->ops->adjust_link)
+                fep->ops->adjust_link(dev);
+        else
+                generic_adjust_link(dev);
+
+        spin_unlock_irqrestore(&fep->lock, flags);
+}
+
+static int fs_init_phy(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        struct phy_device *phydev;
+
+        fep->oldlink = 0;
+        fep->oldspeed = 0;
+        fep->oldduplex = -1;
+
+        phydev = of_phy_connect(dev, fep->fpi->phy_node, &fs_adjust_link, 0,
+                                PHY_INTERFACE_MODE_MII);
+        if (!phydev) {
+                phydev = of_phy_connect_fixed_link(dev, &fs_adjust_link,
+                                                   PHY_INTERFACE_MODE_MII);
+        }
+        if (!phydev) {
+                dev_err(&dev->dev, "Could not attach to PHY\n");
+                return -ENODEV;
+        }
+
+        fep->phydev = phydev;
+
+        return 0;
+}
+
+static int fs_enet_open(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        int r;
+        int err;
+
+        /* to initialize the fep->cur_rx,... */
+        /* not doing this, will cause a crash in fs_enet_rx_napi */
+        fs_init_bds(fep->ndev);
+
+        if (fep->fpi->use_napi)
+                napi_enable(&fep->napi);
+
+        /* Install our interrupt handler. */
+        r = request_irq(fep->interrupt, fs_enet_interrupt, IRQF_SHARED,
+                        "fs_enet-mac", dev);
+        if (r != 0) {
+                dev_err(fep->dev, "Could not allocate FS_ENET IRQ!");
+                if (fep->fpi->use_napi)
+                        napi_disable(&fep->napi);
+                return -EINVAL;
+        }
+
+        err = fs_init_phy(dev);
+        if (err) {
+                free_irq(fep->interrupt, dev);
+                if (fep->fpi->use_napi)
+                        napi_disable(&fep->napi);
+                return err;
+        }
+        phy_start(fep->phydev);
+
+        netif_start_queue(dev);
+
+        return 0;
+}
+
+static int fs_enet_close(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        unsigned long flags;
+
+        netif_stop_queue(dev);
+        netif_carrier_off(dev);
+        if (fep->fpi->use_napi)
+                napi_disable(&fep->napi);
+        phy_stop(fep->phydev);
+
+        spin_lock_irqsave(&fep->lock, flags);
+        spin_lock(&fep->tx_lock);
+        (*fep->ops->stop)(dev);
+        spin_unlock(&fep->tx_lock);
+        spin_unlock_irqrestore(&fep->lock, flags);
+
+        /* release any irqs */
+        phy_disconnect(fep->phydev);
+        fep->phydev = NULL;
+        free_irq(fep->interrupt, dev);
+
+        return 0;
+}
+
+static struct net_device_stats *fs_enet_get_stats(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        return &fep->stats;
+}
+
+/*************************************************************************/
+
+static void fs_get_drvinfo(struct net_device *dev,
+                            struct ethtool_drvinfo *info)
+{
+        strcpy(info->driver, DRV_MODULE_NAME);
+        strcpy(info->version, DRV_MODULE_VERSION);
+}
+
+static int fs_get_regs_len(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+
+        return (*fep->ops->get_regs_len)(dev);
+}
+
+static void fs_get_regs(struct net_device *dev, struct ethtool_regs *regs,
+                         void *p)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        unsigned long flags;
+        int r, len;
+
+        len = regs->len;
+
+        spin_lock_irqsave(&fep->lock, flags);
+        r = (*fep->ops->get_regs)(dev, p, &len);
+        spin_unlock_irqrestore(&fep->lock, flags);
+
+        if (r == 0)
+                regs->version = 0;
+}
+
+static int fs_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+
+        if (!fep->phydev)
+                return -ENODEV;
+
+        return phy_ethtool_gset(fep->phydev, cmd);
+}
+
+static int fs_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+
+        if (!fep->phydev)
+                return -ENODEV;
+
+        return phy_ethtool_sset(fep->phydev, cmd);
+}
+
+static int fs_nway_reset(struct net_device *dev)
+{
+        return 0;
+}
+
+static u32 fs_get_msglevel(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        return fep->msg_enable;
+}
+
+static void fs_set_msglevel(struct net_device *dev, u32 value)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        fep->msg_enable = value;
+}
+
+static const struct ethtool_ops fs_ethtool_ops = {
+        .get_drvinfo = fs_get_drvinfo,
+        .get_regs_len = fs_get_regs_len,
+        .get_settings = fs_get_settings,
+        .set_settings = fs_set_settings,
+        .nway_reset = fs_nway_reset,
+        .get_link = ethtool_op_get_link,
+        .get_msglevel = fs_get_msglevel,
+        .set_msglevel = fs_set_msglevel,
+        .get_regs = fs_get_regs,
+};
+
+static int fs_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+
+        if (!netif_running(dev))
+                return -EINVAL;
+
+        return phy_mii_ioctl(fep->phydev, rq, cmd);
+}
+
+extern int fs_mii_connect(struct net_device *dev);
+extern void fs_mii_disconnect(struct net_device *dev);
+
+/**************************************************************************************/
+
+#ifdef CONFIG_FS_ENET_HAS_FEC
+#define IS_FEC(match) ((match)->data == &fs_fec_ops)
+#else
+#define IS_FEC(match) 0
+#endif
+
+static const struct net_device_ops fs_enet_netdev_ops = {
+        .ndo_open               = fs_enet_open,
+        .ndo_stop               = fs_enet_close,
+        .ndo_get_stats          = fs_enet_get_stats,
+        .ndo_start_xmit         = fs_enet_start_xmit,
+        .ndo_tx_timeout         = fs_timeout,
+        .ndo_set_multicast_list = fs_set_multicast_list,
+        .ndo_do_ioctl           = fs_ioctl,
+        .ndo_validate_addr      = eth_validate_addr,
+        .ndo_set_mac_address    = eth_mac_addr,
+        .ndo_change_mtu         = eth_change_mtu,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+        .ndo_poll_controller    = fs_enet_netpoll,
+#endif
+};
+
+static struct of_device_id fs_enet_match[];
+static int __devinit fs_enet_probe(struct platform_device *ofdev)
+{
+        const struct of_device_id *match;
+        struct net_device *ndev;
+        struct fs_enet_private *fep;
+        struct fs_platform_info *fpi;
+        const u32 *data;
+        const u8 *mac_addr;
+        int privsize, len, ret = -ENODEV;
+
+        match = of_match_device(fs_enet_match, &ofdev->dev);
+        if (!match)
+                return -EINVAL;
+
+        fpi = kzalloc(sizeof(*fpi), GFP_KERNEL);
+        if (!fpi)
+                return -ENOMEM;
+
+        if (!IS_FEC(match)) {
+                data = of_get_property(ofdev->dev.of_node, "fsl,cpm-command", &len);
+                if (!data || len != 4)
+                        goto out_free_fpi;
+
+                fpi->cp_command = *data;
+        }
+
+        fpi->rx_ring = 32;
+        fpi->tx_ring = 32;
+        fpi->rx_copybreak = 240;
+        fpi->use_napi = 1;
+        fpi->napi_weight = 17;
+        fpi->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-handle", 0);
+        if ((!fpi->phy_node) && (!of_get_property(ofdev->dev.of_node, "fixed-link",
+                                                  NULL)))
+                goto out_free_fpi;
+
+        privsize = sizeof(*fep) +
+                   sizeof(struct sk_buff **) *
+                   (fpi->rx_ring + fpi->tx_ring);
+
+        ndev = alloc_etherdev(privsize);
+        if (!ndev) {
+                ret = -ENOMEM;
+                goto out_put;
+        }
+
+        SET_NETDEV_DEV(ndev, &ofdev->dev);
+        dev_set_drvdata(&ofdev->dev, ndev);
+
+        fep = netdev_priv(ndev);
+        fep->dev = &ofdev->dev;
+        fep->ndev = ndev;
+        fep->fpi = fpi;
+        fep->ops = match->data;
+
+        ret = fep->ops->setup_data(ndev);
+        if (ret)
+                goto out_free_dev;
+
+        fep->rx_skbuff = (struct sk_buff **)&fep[1];
+        fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;
+
+        spin_lock_init(&fep->lock);
+        spin_lock_init(&fep->tx_lock);
+
+        mac_addr = of_get_mac_address(ofdev->dev.of_node);
+        if (mac_addr)
+                memcpy(ndev->dev_addr, mac_addr, 6);
+
+        ret = fep->ops->allocate_bd(ndev);
+        if (ret)
+                goto out_cleanup_data;
+
+        fep->rx_bd_base = fep->ring_base;
+        fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;
+
+        fep->tx_ring = fpi->tx_ring;
+        fep->rx_ring = fpi->rx_ring;
+
+        ndev->netdev_ops = &fs_enet_netdev_ops;
+        ndev->watchdog_timeo = 2 * HZ;
+        if (fpi->use_napi)
+                netif_napi_add(ndev, &fep->napi, fs_enet_rx_napi,
+                               fpi->napi_weight);
+
+        ndev->ethtool_ops = &fs_ethtool_ops;
+
+        init_timer(&fep->phy_timer_list);
+
+        netif_carrier_off(ndev);
+
+        ret = register_netdev(ndev);
+        if (ret)
+                goto out_free_bd;
+
+        pr_info("%s: fs_enet: %pM\n", ndev->name, ndev->dev_addr);
+
+        return 0;
+
+out_free_bd:
+        fep->ops->free_bd(ndev);
+out_cleanup_data:
+        fep->ops->cleanup_data(ndev);
+out_free_dev:
+        free_netdev(ndev);
+        dev_set_drvdata(&ofdev->dev, NULL);
+out_put:
+        of_node_put(fpi->phy_node);
+out_free_fpi:
+        kfree(fpi);
+        return ret;
+}
+
+static int fs_enet_remove(struct platform_device *ofdev)
+{
+        struct net_device *ndev = dev_get_drvdata(&ofdev->dev);
+        struct fs_enet_private *fep = netdev_priv(ndev);
+
+        unregister_netdev(ndev);
+
+        fep->ops->free_bd(ndev);
+        fep->ops->cleanup_data(ndev);
+        dev_set_drvdata(fep->dev, NULL);
+        of_node_put(fep->fpi->phy_node);
+        free_netdev(ndev);
+        return 0;
+}
+
+static struct of_device_id fs_enet_match[] = {
+#ifdef CONFIG_FS_ENET_HAS_SCC
+        {
+                .compatible = "fsl,cpm1-scc-enet",
+                .data = (void *)&fs_scc_ops,
+        },
+        {
+                .compatible = "fsl,cpm2-scc-enet",
+                .data = (void *)&fs_scc_ops,
+        },
+#endif
+#ifdef CONFIG_FS_ENET_HAS_FCC
+        {
+                .compatible = "fsl,cpm2-fcc-enet",
+                .data = (void *)&fs_fcc_ops,
+        },
+#endif
+#ifdef CONFIG_FS_ENET_HAS_FEC
+#ifdef CONFIG_FS_ENET_MPC5121_FEC
+        {
+                .compatible = "fsl,mpc5121-fec",
+                .data = (void *)&fs_fec_ops,
+        },
+#else
+        {
+                .compatible = "fsl,pq1-fec-enet",
+                .data = (void *)&fs_fec_ops,
+        },
+#endif
+#endif
+        {}
+};
+MODULE_DEVICE_TABLE(of, fs_enet_match);
+
+static struct platform_driver fs_enet_driver = {
+        .driver = {
+                .owner = THIS_MODULE,
+                .name = "fs_enet",
+                .of_match_table = fs_enet_match,
+        },
+        .probe = fs_enet_probe,
+        .remove = fs_enet_remove,
+};
+
+static int __init fs_init(void)
+{
+        return platform_driver_register(&fs_enet_driver);
+}
+
+static void __exit fs_cleanup(void)
+{
+        platform_driver_unregister(&fs_enet_driver);
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void fs_enet_netpoll(struct net_device *dev)
+{
+       disable_irq(dev->irq);
+       fs_enet_interrupt(dev->irq, dev);
+       enable_irq(dev->irq);
+}
+#endif
+
+/**************************************************************************************/
+
+module_init(fs_init);
+module_exit(fs_cleanup);