Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * Ethernet driver for Motorola MPC8xx.

 * Copyright (c) 1997 Dan Malek (dmalek@jlc.net)

 *

 * I copied the basic skeleton from the lance driver, because I did not

 * know how to write the Linux driver, but I did know how the LANCE worked.

 *

 * This version of the driver is somewhat selectable for the different

 * processor/board combinations.  It works for the boards I know about

 * now, and should be easily modified to include others.  Some of the

 * configuration information is contained in <asm/commproc.h> and the

 * remainder is here.

 *

 * Buffer descriptors are kept in the CPM dual port RAM, and the frame

 * buffers are in the host memory.

 *

 * Right now, I am very watseful 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.

 *

 */

#include <linux/kernel.h>

#include <linux/sched.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/dma-mapping.h>

#include <linux/bitops.h>

#include <asm/8xx_immap.h>

#include <asm/pgtable.h>

#include <asm/mpc8xx.h>

#include <asm/uaccess.h>

#include <asm/commproc.h>

#include <asm/cacheflush.h>

/*

 *                              Theory of Operation

 *

 * The MPC8xx CPM performs the Ethernet processing on SCC1.  It can use

 * an aribtrary number of buffers on byte boundaries, but must have at

 * least two receive buffers to prevent constant overrun conditions.

 *

 * The buffer descriptors are allocated from the CPM dual port memory

 * with the data buffers allocated from host memory, just like all other

 * serial communication protocols.  The host memory buffers are allocated

 * from the free page pool, and then divided into smaller receive and

 * transmit buffers.  The size of the buffers should be a power of two,

 * since that nicely divides the page.  This creates a ring buffer

 * structure similar to the LANCE and other controllers.

 *

 * Like the LANCE driver:

 * The driver runs as two independent, single-threaded flows of control.  One

 * is the send-packet routine, which enforces single-threaded use by the

 * cep->tx_busy flag.  The other thread is the interrupt handler, which is

 * single threaded by the hardware and other software.

 *

 * The send packet thread has partial control over the Tx ring and the

 * 'cep->tx_busy' flag.  It sets the tx_busy flag whenever it's queuing a Tx

 * packet. If the next queue slot is empty, it clears the tx_busy flag when

 * finished otherwise it sets the 'lp->tx_full' flag.

 *

 * The MBX has a control register external to the MPC8xx that has some

 * control of the Ethernet interface.  Information is in the manual for

 * your board.

 *

 * The RPX boards have an external control/status register.  Consult the

 * programming documents for details unique to your board.

 *

 * For the TQM8xx(L) modules, there is no control register interface.

 * All functions are directly controlled using I/O pins.  See <asm/commproc.h>.

 */

/* The transmitter timeout

 */

#define TX_TIMEOUT      (2*HZ)

/* 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 is best

 * to keep them that size.

 * We don't need to allocate pages for the transmitter.  We just use

 * the skbuffer directly.

 */

#ifdef CONFIG_ENET_BIG_BUFFERS

#define CPM_ENET_RX_PAGES       32

#define CPM_ENET_RX_FRSIZE      2048

#define CPM_ENET_RX_FRPPG       (PAGE_SIZE / CPM_ENET_RX_FRSIZE)

#define RX_RING_SIZE            (CPM_ENET_RX_FRPPG * CPM_ENET_RX_PAGES)

#define TX_RING_SIZE            64      /* Must be power of two */

#define TX_RING_MOD_MASK        63      /*   for this to work */

#else

#define CPM_ENET_RX_PAGES       4

#define CPM_ENET_RX_FRSIZE      2048

#define CPM_ENET_RX_FRPPG       (PAGE_SIZE / CPM_ENET_RX_FRSIZE)

#define RX_RING_SIZE            (CPM_ENET_RX_FRPPG * CPM_ENET_RX_PAGES)

#define TX_RING_SIZE            8       /* Must be power of two */

#define TX_RING_MOD_MASK        7       /*   for this to work */

#endif

/* The CPM 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 CPM 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 scc_enet_private {

        /* The saved address of a sent-in-place packet/buffer, for skfree(). */

        struct  sk_buff* tx_skbuff[TX_RING_SIZE];

        ushort  skb_cur;

        ushort  skb_dirty;

        /* CPM dual port RAM relative addresses.

        */

        cbd_t   *rx_bd_base;            /* Address of Rx and Tx buffers. */

        cbd_t   *tx_bd_base;

        cbd_t   *cur_rx, *cur_tx;               /* The next free ring entry */

        cbd_t   *dirty_tx;      /* The ring entries to be free()ed. */

        scc_t   *sccp;

        /* Virtual addresses for the receive buffers because we can't

         * do a __va() on them anymore.

         */

        unsigned char *rx_vaddr[RX_RING_SIZE];

        struct  net_device_stats stats;

        uint    tx_full;

        spinlock_t lock;

};

static int scc_enet_open(struct net_device *dev);

static int scc_enet_start_xmit(struct sk_buff *skb, struct net_device *dev);

static int scc_enet_rx(struct net_device *dev);

static void scc_enet_interrupt(void *dev_id);

static int scc_enet_close(struct net_device *dev);

static struct net_device_stats *scc_enet_get_stats(struct net_device *dev);

static void set_multicast_list(struct net_device *dev);

/* Get this from various configuration locations (depends on board).

*/

/*static        ushort  my_enet_addr[] = { 0x0800, 0x3e26, 0x1559 };*/

/* Typically, 860(T) boards use SCC1 for Ethernet, and other 8xx boards

 * use SCC2. Some even may use SCC3.

 * This is easily extended if necessary.

 */

#if defined(CONFIG_SCC3_ENET)

#define CPM_CR_ENET     CPM_CR_CH_SCC3

#define PROFF_ENET      PROFF_SCC3

#define SCC_ENET        2               /* Index, not number! */

#define CPMVEC_ENET     CPMVEC_SCC3

#elif defined(CONFIG_SCC2_ENET)

#define CPM_CR_ENET     CPM_CR_CH_SCC2

#define PROFF_ENET      PROFF_SCC2

#define SCC_ENET        1               /* Index, not number! */

#define CPMVEC_ENET     CPMVEC_SCC2

#elif defined(CONFIG_SCC1_ENET)

#define CPM_CR_ENET     CPM_CR_CH_SCC1

#define PROFF_ENET      PROFF_SCC1

#define SCC_ENET        0                /* Index, not number! */

#define CPMVEC_ENET     CPMVEC_SCC1

#else

#error CONFIG_SCCx_ENET not defined

#endif

static int

scc_enet_open(struct net_device *dev)

{

        /* I should reset the ring buffers here, but I don't yet know

         * a simple way to do that.

         */

        netif_start_queue(dev);

        return 0;                                        /* Always succeed */

}

static int

scc_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)

{

        struct scc_enet_private *cep = (struct scc_enet_private *)dev->priv;

        volatile cbd_t  *bdp;

        /* Fill in a Tx ring entry */

        bdp = cep->cur_tx;

#ifndef final_version

        if (bdp->cbd_sc & BD_ENET_TX_READY) {

                /* Ooops.  All transmit buffers are full.  Bail out.

                 * This should not happen, since cep->tx_busy should be set.

                 */

                printk("%s: tx queue full!.\n", dev->name);

                return 1;

        }

#endif

        /* Clear all of the status flags.

         */

        bdp->cbd_sc &= ~BD_ENET_TX_STATS;

        /* If the frame is short, tell CPM to pad it.

        */

        if (skb->len <= ETH_ZLEN)

                bdp->cbd_sc |= BD_ENET_TX_PAD;

        else

                bdp->cbd_sc &= ~BD_ENET_TX_PAD;

        /* Set buffer length and buffer pointer.

        */

        bdp->cbd_datlen = skb->len;

        bdp->cbd_bufaddr = __pa(skb->data);

        /* Save skb pointer.

        */

        cep->tx_skbuff[cep->skb_cur] = skb;

        cep->stats.tx_bytes += skb->len;

        cep->skb_cur = (cep->skb_cur+1) & TX_RING_MOD_MASK;

        /* Push the data cache so the CPM does not get stale memory

         * data.

         */

        flush_dcache_range((unsigned long)(skb->data),

                                        (unsigned long)(skb->data + skb->len));

        spin_lock_irq(&cep->lock);

        /* Send it on its way.  Tell CPM its ready, interrupt when done,

         * its the last BD of the frame, and to put the CRC on the end.

         */

        bdp->cbd_sc |= (BD_ENET_TX_READY | BD_ENET_TX_INTR | BD_ENET_TX_LAST | BD_ENET_TX_TC);

        dev->trans_start = jiffies;

        /* If this was the last BD in the ring, start at the beginning again.

        */

        if (bdp->cbd_sc & BD_ENET_TX_WRAP)

                bdp = cep->tx_bd_base;

        else

                bdp++;

        if (bdp->cbd_sc & BD_ENET_TX_READY) {

                netif_stop_queue(dev);

                cep->tx_full = 1;

        }

        cep->cur_tx = (cbd_t *)bdp;

        spin_unlock_irq(&cep->lock);

        return 0;

}

static void

scc_enet_timeout(struct net_device *dev)

{

        struct scc_enet_private *cep = (struct scc_enet_private *)dev->priv;

        printk("%s: transmit timed out.\n", dev->name);

        cep->stats.tx_errors++;

#ifndef final_version

        {

                int     i;

                cbd_t   *bdp;

                printk(" Ring data dump: cur_tx %p%s cur_rx %p.\n",

                       cep->cur_tx, cep->tx_full ? " (full)" : "",

                       cep->cur_rx);

                bdp = cep->tx_bd_base;

                for (i = 0 ; i < TX_RING_SIZE; i++, bdp++)

                        printk("%04x %04x %08x\n",

                               bdp->cbd_sc,

                               bdp->cbd_datlen,

                               bdp->cbd_bufaddr);

                bdp = cep->rx_bd_base;

                for (i = 0 ; i < RX_RING_SIZE; i++, bdp++)

                        printk("%04x %04x %08x\n",

                               bdp->cbd_sc,

                               bdp->cbd_datlen,

                               bdp->cbd_bufaddr);

        }

#endif

        if (!cep->tx_full)

                netif_wake_queue(dev);

}

/* The interrupt handler.

 * This is called from the CPM handler, not the MPC core interrupt.

 */

static void

scc_enet_interrupt(void *dev_id)

{

        struct  net_device *dev = dev_id;

        volatile struct scc_enet_private *cep;

        volatile cbd_t  *bdp;

        ushort  int_events;

        int     must_restart;

        cep = (struct scc_enet_private *)dev->priv;

        /* Get the interrupt events that caused us to be here.

        */

        int_events = cep->sccp->scc_scce;

        cep->sccp->scc_scce = int_events;

        must_restart = 0;

        /* Handle receive event in its own function.

        */

        if (int_events & SCCE_ENET_RXF)

                scc_enet_rx(dev_id);

        /* Check for a transmit error.  The manual is a little unclear

         * about this, so the debug code until I get it figured out.  It

         * appears that if TXE is set, then TXB is not set.  However,

         * if carrier sense is lost during frame transmission, the TXE

         * bit is set, "and continues the buffer transmission normally."

         * I don't know if "normally" implies TXB is set when the buffer

         * descriptor is closed.....trial and error :-).

         */

        /* Transmit OK, or non-fatal error.  Update the buffer descriptors.

        */

        if (int_events & (SCCE_ENET_TXE | SCCE_ENET_TXB)) {

            spin_lock(&cep->lock);

            bdp = cep->dirty_tx;

            while ((bdp->cbd_sc&BD_ENET_TX_READY)==0) {

                if ((bdp==cep->cur_tx) && (cep->tx_full == 0))

                    break;

                if (bdp->cbd_sc & BD_ENET_TX_HB)        /* No heartbeat */

                        cep->stats.tx_heartbeat_errors++;

                if (bdp->cbd_sc & BD_ENET_TX_LC)        /* Late collision */

                        cep->stats.tx_window_errors++;

                if (bdp->cbd_sc & BD_ENET_TX_RL)        /* Retrans limit */

                        cep->stats.tx_aborted_errors++;

                if (bdp->cbd_sc & BD_ENET_TX_UN)        /* Underrun */

                        cep->stats.tx_fifo_errors++;

                if (bdp->cbd_sc & BD_ENET_TX_CSL)       /* Carrier lost */

                        cep->stats.tx_carrier_errors++;

                /* No heartbeat or Lost carrier are not really bad errors.

                 * The others require a restart transmit command.

                 */

                if (bdp->cbd_sc &

                    (BD_ENET_TX_LC | BD_ENET_TX_RL | BD_ENET_TX_UN)) {

                        must_restart = 1;

                        cep->stats.tx_errors++;

                }

                cep->stats.tx_packets++;

                /* Deferred means some collisions occurred during transmit,

                 * but we eventually sent the packet OK.

                 */

                if (bdp->cbd_sc & BD_ENET_TX_DEF)

                        cep->stats.collisions++;

                /* Free the sk buffer associated with this last transmit.

                */

                dev_kfree_skb_irq(cep->tx_skbuff[cep->skb_dirty]);

                cep->skb_dirty = (cep->skb_dirty + 1) & TX_RING_MOD_MASK;

                /* Update pointer to next buffer descriptor to be transmitted.

                */

                if (bdp->cbd_sc & BD_ENET_TX_WRAP)

                        bdp = cep->tx_bd_base;

                else

                        bdp++;

                /* I don't know if we can be held off from processing these

                 * interrupts for more than one frame time.  I really hope

                 * not.  In such a case, we would now want to check the

                 * currently available BD (cur_tx) and determine if any

                 * buffers between the dirty_tx and cur_tx have also been

                 * sent.  We would want to process anything in between that

                 * does not have BD_ENET_TX_READY set.

                 */

                /* Since we have freed up a buffer, the ring is no longer

                 * full.

                 */

                if (cep->tx_full) {

                        cep->tx_full = 0;

                        if (netif_queue_stopped(dev))

                                netif_wake_queue(dev);

                }

                cep->dirty_tx = (cbd_t *)bdp;

            }

            if (must_restart) {

                volatile cpm8xx_t *cp;

                /* Some transmit errors cause the transmitter to shut

                 * down.  We now issue a restart transmit.  Since the

                 * errors close the BD and update the pointers, the restart

                 * _should_ pick up without having to reset any of our

                 * pointers either.

                 */

                cp = cpmp;

                cp->cp_cpcr =

                    mk_cr_cmd(CPM_CR_ENET, CPM_CR_RESTART_TX) | CPM_CR_FLG;

                while (cp->cp_cpcr & CPM_CR_FLG);

            }

            spin_unlock(&cep->lock);

        }

        /* Check for receive busy, i.e. packets coming but no place to

         * put them.  This "can't happen" because the receive interrupt

         * is tossing previous frames.

         */

        if (int_events & SCCE_ENET_BSY) {

                cep->stats.rx_dropped++;

                printk("CPM ENET: BSY can't happen.\n");

        }

        return;

}

/* 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 int

scc_enet_rx(struct net_device *dev)

{

        struct  scc_enet_private *cep;

        volatile cbd_t  *bdp;

        struct  sk_buff *skb;

        ushort  pkt_len;

        cep = (struct scc_enet_private *)dev->priv;

        /* First, grab all of the stats for the incoming packet.

         * These get messed up if we get called due to a busy condition.

         */

        bdp = cep->cur_rx;

for (;;) {

        if (bdp->cbd_sc & BD_ENET_RX_EMPTY)

                break;

#ifndef final_version

        /* Since we have allocated space to hold a complete frame, both

         * the first and last indicators should be set.

         */

        if ((bdp->cbd_sc & (BD_ENET_RX_FIRST | BD_ENET_RX_LAST)) !=

                (BD_ENET_RX_FIRST | BD_ENET_RX_LAST))

                        printk("CPM ENET: rcv is not first+last\n");

#endif

        /* Frame too long or too short.

        */

        if (bdp->cbd_sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))

                cep->stats.rx_length_errors++;

        if (bdp->cbd_sc & BD_ENET_RX_NO)        /* Frame alignment */

                cep->stats.rx_frame_errors++;

        if (bdp->cbd_sc & BD_ENET_RX_CR)        /* CRC Error */

                cep->stats.rx_crc_errors++;

        if (bdp->cbd_sc & BD_ENET_RX_OV)        /* FIFO overrun */

                cep->stats.rx_crc_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 (bdp->cbd_sc & BD_ENET_RX_CL) {

                cep->stats.rx_frame_errors++;

        }

        else {

                /* Process the incoming frame.

                */

                cep->stats.rx_packets++;

                pkt_len = bdp->cbd_datlen;

                cep->stats.rx_bytes += pkt_len;

                /* This does 16 byte alignment, much more than 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);

                if (skb == NULL) {

                        printk("%s: Memory squeeze, dropping packet.\n", dev->name);

                        cep->stats.rx_dropped++;

                }

                else {

                        skb_put(skb,pkt_len-4); /* Make room */

                        skb_copy_to_linear_data(skb,

                                cep->rx_vaddr[bdp - cep->rx_bd_base],

                                pkt_len-4);

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

                        netif_rx(skb);

                }

        }

        /* Clear the status flags for this buffer.

        */

        bdp->cbd_sc &= ~BD_ENET_RX_STATS;

        /* Mark the buffer empty.

        */

        bdp->cbd_sc |= BD_ENET_RX_EMPTY;

        /* Update BD pointer to next entry.

        */

        if (bdp->cbd_sc & BD_ENET_RX_WRAP)

                bdp = cep->rx_bd_base;

        else

                bdp++;

   }

        cep->cur_rx = (cbd_t *)bdp;

        return 0;

}

static int

scc_enet_close(struct net_device *dev)

{

        /* Don't know what to do yet.

        */

        netif_stop_queue(dev);

        return 0;

}

static struct net_device_stats *scc_enet_get_stats(struct net_device *dev)

{

        struct scc_enet_private *cep = (struct scc_enet_private *)dev->priv;

        return &cep->stats;

}

/* 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?).

 */

static void set_multicast_list(struct net_device *dev)

{

        struct  scc_enet_private *cep;

        struct  dev_mc_list *dmi;

        u_char  *mcptr, *tdptr;

        volatile scc_enet_t *ep;

        int     i, j;

        cep = (struct scc_enet_private *)dev->priv;

        /* Get pointer to SCC area in parameter RAM.

        */

        ep = (scc_enet_t *)dev->base_addr;

        if (dev->flags&IFF_PROMISC) {

                /* Log any net taps. */

                printk("%s: Promiscuous mode enabled.\n", dev->name);

                cep->sccp->scc_psmr |= SCC_PSMR_PRO;

        } else {

                cep->sccp->scc_psmr &= ~SCC_PSMR_PRO;

                if (dev->flags & IFF_ALLMULTI) {

                        /* Catch all multicast addresses, so set the

                         * filter to all 1's.

                         */

                        ep->sen_gaddr1 = 0xffff;

                        ep->sen_gaddr2 = 0xffff;

                        ep->sen_gaddr3 = 0xffff;

                        ep->sen_gaddr4 = 0xffff;

                }

                else {

                        /* Clear filter and add the addresses in the list.

                        */

                        ep->sen_gaddr1 = 0;

                        ep->sen_gaddr2 = 0;

                        ep->sen_gaddr3 = 0;

                        ep->sen_gaddr4 = 0;

                        dmi = dev->mc_list;

                        for (i=0; i<dev->mc_count; i++) {

                                /* Only support group multicast for now.

                                */

                                if (!(dmi->dmi_addr[0] & 1))

                                        continue;

                                /* The address in dmi_addr is LSB first,

                                 * and taddr is MSB first.  We have to

                                 * copy bytes MSB first from dmi_addr.

                                 */

                                mcptr = (u_char *)dmi->dmi_addr + 5;

                                tdptr = (u_char *)&ep->sen_taddrh;

                                for (j=0; j<6; j++)

                                        *tdptr++ = *mcptr--;

                                /* Ask CPM to run CRC and set bit in

                                 * filter mask.

                                 */

                                cpmp->cp_cpcr = mk_cr_cmd(CPM_CR_ENET, CPM_CR_SET_GADDR) | CPM_CR_FLG;

                                /* this delay is necessary here -- Cort */

                                udelay(10);

                                while (cpmp->cp_cpcr & CPM_CR_FLG);

                        }

                }

        }

}

/* Initialize the CPM Ethernet on SCC.  If EPPC-Bug loaded us, or performed

 * some other network I/O, a whole bunch of this has already been set up.

 * It is no big deal if we do it again, we just have to disable the

 * transmit and receive to make sure we don't catch the CPM with some

 * inconsistent control information.

 */

static int __init scc_enet_init(void)

{

        struct net_device *dev;

        struct scc_enet_private *cep;

        int i, j, k, err;

        uint dp_offset;

        unsigned char   *eap, *ba;

        dma_addr_t      mem_addr;

        bd_t            *bd;

        volatile        cbd_t           *bdp;

        volatile        cpm8xx_t        *cp;

        volatile        scc_t           *sccp;

        volatile        scc_enet_t      *ep;

        volatile        immap_t         *immap;

        cp = cpmp;      /* Get pointer to Communication Processor */

        immap = (immap_t *)(mfspr(SPRN_IMMR) & 0xFFFF0000);     /* and to internal registers */

        bd = (bd_t *)__res;

        dev = alloc_etherdev(sizeof(*cep));

        if (!dev)

                return -ENOMEM;

        cep = dev->priv;

        spin_lock_init(&cep->lock);

        /* Get pointer to SCC area in parameter RAM.

        */

        ep = (scc_enet_t *)(&cp->cp_dparam[PROFF_ENET]);

        /* And another to the SCC register area.

        */

        sccp = (volatile scc_t *)(&cp->cp_scc[SCC_ENET]);

        cep->sccp = (scc_t *)sccp;              /* Keep the pointer handy */

        /* Disable receive and transmit in case EPPC-Bug started it.

        */

        sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);

        /* Cookbook style from the MPC860 manual.....

         * Not all of this is necessary if EPPC-Bug has initialized

         * the network.

         * So far we are lucky, all board configurations use the same

         * pins, or at least the same I/O Port for these functions.....

         * It can't last though......

         */

#if (defined(PA_ENET_RXD) && defined(PA_ENET_TXD))

        /* Configure port A pins for Txd and Rxd.

        */

        immap->im_ioport.iop_papar |=  (PA_ENET_RXD | PA_ENET_TXD);

        immap->im_ioport.iop_padir &= ~(PA_ENET_RXD | PA_ENET_TXD);

        immap->im_ioport.iop_paodr &=                ~PA_ENET_TXD;

#elif (defined(PB_ENET_RXD) && defined(PB_ENET_TXD))

        /* Configure port B pins for Txd and Rxd.

        */

        immap->im_cpm.cp_pbpar |=  (PB_ENET_RXD | PB_ENET_TXD);

        immap->im_cpm.cp_pbdir &= ~(PB_ENET_RXD | PB_ENET_TXD);

        immap->im_cpm.cp_pbodr &=                ~PB_ENET_TXD;

#else

#error Exactly ONE pair of PA_ENET_[RT]XD, PB_ENET_[RT]XD must be defined

#endif

#if defined(PC_ENET_LBK)

        /* Configure port C pins to disable External Loopback

         */

        immap->im_ioport.iop_pcpar &= ~PC_ENET_LBK;

        immap->im_ioport.iop_pcdir |=  PC_ENET_LBK;

        immap->im_ioport.iop_pcso  &= ~PC_ENET_LBK;

        immap->im_ioport.iop_pcdat &= ~PC_ENET_LBK;     /* Disable Loopback */

#endif  /* PC_ENET_LBK */

#ifdef PE_ENET_TCLK

        /* Configure port E for TCLK and RCLK.

        */

        cp->cp_pepar |=  (PE_ENET_TCLK | PE_ENET_RCLK);

        cp->cp_pedir &= ~(PE_ENET_TCLK | PE_ENET_RCLK);

        cp->cp_peso  &= ~(PE_ENET_TCLK | PE_ENET_RCLK);

#else

        /* Configure port A for TCLK and RCLK.

        */

        immap->im_ioport.iop_papar |=  (PA_ENET_TCLK | PA_ENET_RCLK);

        immap->im_ioport.iop_padir &= ~(PA_ENET_TCLK | PA_ENET_RCLK);

#endif

        /* Configure port C pins to enable CLSN and RENA.

        */

        immap->im_ioport.iop_pcpar &= ~(PC_ENET_CLSN | PC_ENET_RENA);

        immap->im_ioport.iop_pcdir &= ~(PC_ENET_CLSN | PC_ENET_RENA);

        immap->im_ioport.iop_pcso  |=  (PC_ENET_CLSN | PC_ENET_RENA);

        /* Configure Serial Interface clock routing.

         * First, clear all SCC bits to zero, then set the ones we want.

         */

        cp->cp_sicr &= ~SICR_ENET_MASK;