Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 971 insertions, 0 deletions

diff --git a/arch/ppc/8xx_io/enet.c b/arch/ppc/8xx_io/enet.c
new file mode 100644
index 000000000000..4ea7158e5062
--- /dev/null
+++ b/arch/ppc/8xx_io/enet.c
@@ -0,0 +1,971 @@
+/*
+ * 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/config.h>
+#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/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/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>
+
+/*
+ *                              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, struct pt_regs *regs);
+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 pt_regs *regs)
+{
+        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->dev = dev;
+                        skb_put(skb,pkt_len-4); /* Make room */
+                        eth_copy_and_sum(skb,
+                                cep->rx_vaddr[bdp - cep->rx_bd_base],
+                                pkt_len-4, 0);
+                        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 */
+
+        /* 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 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);
+
+        /* Configure Serial Interface clock routing.
+         * First, clear all SCC bits to zero, then set the ones we want.
+         */
+        cp->cp_sicr &= ~SICR_ENET_MASK;
+        cp->cp_sicr |=  SICR_ENET_CLKRT;
+
+        /* Manual says set SDDR, but I can't find anything with that
+         * name.  I think it is a misprint, and should be SDCR.  This
+         * has already been set by the communication processor initialization.
+         */
+
+        /* Allocate space for the buffer descriptors in the DP ram.
+         * These are relative offsets in the DP ram address space.
+         * Initialize base addresses for the buffer descriptors.
+         */
+        dp_offset = cpm_dpalloc(sizeof(cbd_t) * RX_RING_SIZE, 8);
+        ep->sen_genscc.scc_rbase = dp_offset;
+        cep->rx_bd_base = cpm_dpram_addr(dp_offset);
+
+        dp_offset = cpm_dpalloc(sizeof(cbd_t) * TX_RING_SIZE, 8);
+        ep->sen_genscc.scc_tbase = dp_offset;
+        cep->tx_bd_base = cpm_dpram_addr(dp_offset);
+
+        cep->dirty_tx = cep->cur_tx = cep->tx_bd_base;
+        cep->cur_rx = cep->rx_bd_base;
+
+        /* Issue init Rx BD command for SCC.
+         * Manual says to perform an Init Rx parameters here.  We have
+         * to perform both Rx and Tx because the SCC may have been
+         * already running.
+         * In addition, we have to do it later because we don't yet have
+         * all of the BD control/status set properly.
+        cp->cp_cpcr = mk_cr_cmd(CPM_CR_ENET, CPM_CR_INIT_RX) | CPM_CR_FLG;
+        while (cp->cp_cpcr & CPM_CR_FLG);
+         */
+
+        /* Initialize function code registers for big-endian.
+        */
+        ep->sen_genscc.scc_rfcr = SCC_EB;
+        ep->sen_genscc.scc_tfcr = SCC_EB;
+
+        /* Set maximum bytes per receive buffer.
+         * This appears to be an Ethernet frame size, not the buffer
+         * fragment size.  It must be a multiple of four.
+         */
+        ep->sen_genscc.scc_mrblr = PKT_MAXBLR_SIZE;
+
+        /* Set CRC preset and mask.
+        */
+        ep->sen_cpres = 0xffffffff;
+        ep->sen_cmask = 0xdebb20e3;
+
+        ep->sen_crcec = 0;      /* CRC Error counter */
+        ep->sen_alec = 0;       /* alignment error counter */
+        ep->sen_disfc = 0;      /* discard frame counter */
+
+        ep->sen_pads = 0x8888;  /* Tx short frame pad character */
+        ep->sen_retlim = 15;    /* Retry limit threshold */
+
+        ep->sen_maxflr = PKT_MAXBUF_SIZE;   /* maximum frame length register */
+        ep->sen_minflr = PKT_MINBUF_SIZE;  /* minimum frame length register */
+
+        ep->sen_maxd1 = PKT_MAXBLR_SIZE;        /* maximum DMA1 length */
+        ep->sen_maxd2 = PKT_MAXBLR_SIZE;        /* maximum DMA2 length */
+
+        /* Clear hash tables.
+        */
+        ep->sen_gaddr1 = 0;
+        ep->sen_gaddr2 = 0;
+        ep->sen_gaddr3 = 0;
+        ep->sen_gaddr4 = 0;
+        ep->sen_iaddr1 = 0;
+        ep->sen_iaddr2 = 0;
+        ep->sen_iaddr3 = 0;
+        ep->sen_iaddr4 = 0;
+
+        /* Set Ethernet station address.
+         */
+        eap = (unsigned char *)&(ep->sen_paddrh);
+        for (i=5; i>=0; i--)
+                *eap++ = dev->dev_addr[i] = bd->bi_enetaddr[i];
+
+        ep->sen_pper = 0;       /* 'cause the book says so */
+        ep->sen_taddrl = 0;     /* temp address (LSB) */
+        ep->sen_taddrm = 0;
+        ep->sen_taddrh = 0;     /* temp address (MSB) */
+
+        /* Now allocate the host memory pages and initialize the
+         * buffer descriptors.
+         */
+        bdp = cep->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;
+
+        bdp = cep->rx_bd_base;
+        k = 0;
+        for (i=0; i<CPM_ENET_RX_PAGES; i++) {
+
+                /* Allocate a page.
+                */
+                ba = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE,
+                                &mem_addr, GFP_KERNEL);
+                /* BUG: no check for failure */
+
+                /* Initialize the BD for every fragment in the page.
+                */
+                for (j=0; j<CPM_ENET_RX_FRPPG; j++) {
+                        bdp->cbd_sc = BD_ENET_RX_EMPTY | BD_ENET_RX_INTR;
+                        bdp->cbd_bufaddr = mem_addr;
+                        cep->rx_vaddr[k++] = ba;
+                        mem_addr += CPM_ENET_RX_FRSIZE;
+                        ba += CPM_ENET_RX_FRSIZE;
+                        bdp++;
+                }
+        }
+
+        /* Set the last buffer to wrap.
+        */
+        bdp--;
+        bdp->cbd_sc |= BD_SC_WRAP;
+
+        /* Let's re-initialize the channel now.  We have to do it later
+         * than the manual describes because we have just now finished
+         * the BD initialization.
+         */
+        cp->cp_cpcr = mk_cr_cmd(CPM_CR_ENET, CPM_CR_INIT_TRX) | CPM_CR_FLG;
+        while (cp->cp_cpcr & CPM_CR_FLG);
+
+        cep->skb_cur = cep->skb_dirty = 0;
+
+        sccp->scc_scce = 0xffff;        /* Clear any pending events */
+
+        /* Enable interrupts for transmit error, complete frame
+         * received, and any transmit buffer we have also set the
+         * interrupt flag.
+         */
+        sccp->scc_sccm = (SCCE_ENET_TXE | SCCE_ENET_RXF | SCCE_ENET_TXB);
+
+        /* Install our interrupt handler.
+        */
+        cpm_install_handler(CPMVEC_ENET, scc_enet_interrupt, dev);
+
+        /* Set GSMR_H to enable all normal operating modes.
+         * Set GSMR_L to enable Ethernet to MC68160.
+         */
+        sccp->scc_gsmrh = 0;
+        sccp->scc_gsmrl = (SCC_GSMRL_TCI | SCC_GSMRL_TPL_48 | SCC_GSMRL_TPP_10 | SCC_GSMRL_MODE_ENET);
+
+        /* Set sync/delimiters.
+        */
+        sccp->scc_dsr = 0xd555;
+
+        /* Set processing mode.  Use Ethernet CRC, catch broadcast, and
+         * start frame search 22 bit times after RENA.
+         */
+        sccp->scc_psmr = (SCC_PSMR_ENCRC | SCC_PSMR_NIB22);
+
+        /* It is now OK to enable the Ethernet transmitter.
+         * Unfortunately, there are board implementation differences here.
+         */
+#if   (!defined (PB_ENET_TENA) &&  defined (PC_ENET_TENA))
+        immap->im_ioport.iop_pcpar |=  PC_ENET_TENA;
+        immap->im_ioport.iop_pcdir &= ~PC_ENET_TENA;
+#elif ( defined (PB_ENET_TENA) && !defined (PC_ENET_TENA))
+        cp->cp_pbpar |= PB_ENET_TENA;
+        cp->cp_pbdir |= PB_ENET_TENA;
+#else
+#error Configuration Error: define exactly ONE of PB_ENET_TENA, PC_ENET_TENA
+#endif
+
+#if defined(CONFIG_RPXLITE) || defined(CONFIG_RPXCLASSIC)
+        /* And while we are here, set the configuration to enable ethernet.
+        */
+        *((volatile uint *)RPX_CSR_ADDR) &= ~BCSR0_ETHLPBK;
+        *((volatile uint *)RPX_CSR_ADDR) |=
+                        (BCSR0_ETHEN | BCSR0_COLTESTDIS | BCSR0_FULLDPLXDIS);
+#endif
+
+#ifdef CONFIG_BSEIP
+        /* BSE uses port B and C for PHY control.
+        */
+        cp->cp_pbpar &= ~(PB_BSE_POWERUP | PB_BSE_FDXDIS);
+        cp->cp_pbdir |= (PB_BSE_POWERUP | PB_BSE_FDXDIS);
+        cp->cp_pbdat |= (PB_BSE_POWERUP | PB_BSE_FDXDIS);
+
+        immap->im_ioport.iop_pcpar &= ~PC_BSE_LOOPBACK;
+        immap->im_ioport.iop_pcdir |= PC_BSE_LOOPBACK;
+        immap->im_ioport.iop_pcso &= ~PC_BSE_LOOPBACK;
+        immap->im_ioport.iop_pcdat &= ~PC_BSE_LOOPBACK;
+#endif
+
+#ifdef CONFIG_FADS
+        cp->cp_pbpar |= PB_ENET_TENA;
+        cp->cp_pbdir |= PB_ENET_TENA;
+
+        /* Enable the EEST PHY.
+        */
+        *((volatile uint *)BCSR1) &= ~BCSR1_ETHEN;
+#endif
+
+        dev->base_addr = (unsigned long)ep;
+#if 0
+        dev->name = "CPM_ENET";
+#endif
+
+        /* The CPM Ethernet specific entries in the device structure. */
+        dev->open = scc_enet_open;
+        dev->hard_start_xmit = scc_enet_start_xmit;
+        dev->tx_timeout = scc_enet_timeout;
+        dev->watchdog_timeo = TX_TIMEOUT;
+        dev->stop = scc_enet_close;
+        dev->get_stats = scc_enet_get_stats;
+        dev->set_multicast_list = set_multicast_list;
+
+        err = register_netdev(dev);
+        if (err) {
+                free_netdev(dev);
+                return err;
+        }
+
+        /* And last, enable the transmit and receive processing.
+        */
+        sccp->scc_gsmrl |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+
+        printk("%s: CPM ENET Version 0.2 on SCC%d, ", dev->name, SCC_ENET+1);
+        for (i=0; i<5; i++)
+                printk("%02x:", dev->dev_addr[i]);
+        printk("%02x\n", dev->dev_addr[5]);
+
+        return 0;
+}
+
+module_init(scc_enet_init);