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pasemi_mac.c

/*
 * Copyright (C) 2006-2007 PA Semi, Inc
 *
 * Driver for the PA Semi PWRficient onchip 1G/10G Ethernet MACs
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/dmaengine.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <asm/dma-mapping.h>
#include <linux/in.h>
#include <linux/skbuff.h>

#include <linux/ip.h>
#include <linux/tcp.h>
#include <net/checksum.h>

#include <asm/irq.h>
#include <asm/firmware.h>

#include "pasemi_mac.h"

/* We have our own align, since ppc64 in general has it at 0 because
 * of design flaws in some of the server bridge chips. However, for
 * PWRficient doing the unaligned copies is more expensive than doing
 * unaligned DMA, so make sure the data is aligned instead.
 */
#define LOCAL_SKB_ALIGN 2

/* TODO list
 *
 * - Multicast support
 * - Large MTU support
 * - SW LRO
 * - Multiqueue RX/TX
 */


/* Must be a power of two */
#define RX_RING_SIZE 4096
#define TX_RING_SIZE 4096

#define DEFAULT_MSG_ENABLE      \
      (NETIF_MSG_DRV          | \
       NETIF_MSG_PROBE  | \
       NETIF_MSG_LINK         | \
       NETIF_MSG_TIMER  | \
       NETIF_MSG_IFDOWN | \
       NETIF_MSG_IFUP         | \
       NETIF_MSG_RX_ERR | \
       NETIF_MSG_TX_ERR)

#define TX_RING(mac, num)     ((mac)->tx->ring[(num) & (TX_RING_SIZE-1)])
#define TX_RING_INFO(mac, num)      ((mac)->tx->ring_info[(num) & (TX_RING_SIZE-1)])
#define RX_RING(mac, num)     ((mac)->rx->ring[(num) & (RX_RING_SIZE-1)])
#define RX_RING_INFO(mac, num)      ((mac)->rx->ring_info[(num) & (RX_RING_SIZE-1)])
#define RX_BUFF(mac, num)     ((mac)->rx->buffers[(num) & (RX_RING_SIZE-1)])

#define RING_USED(ring)       (((ring)->next_to_fill - (ring)->next_to_clean) \
                         & ((ring)->size - 1))
#define RING_AVAIL(ring)      ((ring->size) - RING_USED(ring))

#define BUF_SIZE 1646 /* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */

MODULE_LICENSE("GPL");
MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver");

static int debug = -1;  /* -1 == use DEFAULT_MSG_ENABLE as value */
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "PA Semi MAC bitmapped debugging message enable value");

static struct pasdma_status *dma_status;

static int translation_enabled(void)
{
#if defined(CONFIG_PPC_PASEMI_IOMMU_DMA_FORCE)
      return 1;
#else
      return firmware_has_feature(FW_FEATURE_LPAR);
#endif
}

static void write_iob_reg(struct pasemi_mac *mac, unsigned int reg,
                    unsigned int val)
{
      out_le32(mac->iob_regs+reg, val);
}

static unsigned int read_mac_reg(struct pasemi_mac *mac, unsigned int reg)
{
      return in_le32(mac->regs+reg);
}

static void write_mac_reg(struct pasemi_mac *mac, unsigned int reg,
                    unsigned int val)
{
      out_le32(mac->regs+reg, val);
}

static unsigned int read_dma_reg(struct pasemi_mac *mac, unsigned int reg)
{
      return in_le32(mac->dma_regs+reg);
}

static void write_dma_reg(struct pasemi_mac *mac, unsigned int reg,
                    unsigned int val)
{
      out_le32(mac->dma_regs+reg, val);
}

static int pasemi_get_mac_addr(struct pasemi_mac *mac)
{
      struct pci_dev *pdev = mac->pdev;
      struct device_node *dn = pci_device_to_OF_node(pdev);
      int len;
      const u8 *maddr;
      u8 addr[6];

      if (!dn) {
            dev_dbg(&pdev->dev,
                    "No device node for mac, not configuring\n");
            return -ENOENT;
      }

      maddr = of_get_property(dn, "local-mac-address", &len);

      if (maddr && len == 6) {
            memcpy(mac->mac_addr, maddr, 6);
            return 0;
      }

      /* Some old versions of firmware mistakenly uses mac-address
       * (and as a string) instead of a byte array in local-mac-address.
       */

      if (maddr == NULL)
            maddr = of_get_property(dn, "mac-address", NULL);

      if (maddr == NULL) {
            dev_warn(&pdev->dev,
                   "no mac address in device tree, not configuring\n");
            return -ENOENT;
      }


      if (sscanf(maddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &addr[0],
               &addr[1], &addr[2], &addr[3], &addr[4], &addr[5]) != 6) {
            dev_warn(&pdev->dev,
                   "can't parse mac address, not configuring\n");
            return -EINVAL;
      }

      memcpy(mac->mac_addr, addr, 6);

      return 0;
}

static int pasemi_mac_unmap_tx_skb(struct pasemi_mac *mac,
                            struct sk_buff *skb,
                            dma_addr_t *dmas)
{
      int f;
      int nfrags = skb_shinfo(skb)->nr_frags;

      pci_unmap_single(mac->dma_pdev, dmas[0], skb_headlen(skb),
                   PCI_DMA_TODEVICE);

      for (f = 0; f < nfrags; f++) {
            skb_frag_t *frag = &skb_shinfo(skb)->frags[f];

            pci_unmap_page(mac->dma_pdev, dmas[f+1], frag->size,
                         PCI_DMA_TODEVICE);
      }
      dev_kfree_skb_irq(skb);

      /* Freed descriptor slot + main SKB ptr + nfrags additional ptrs,
       * aligned up to a power of 2
       */
      return (nfrags + 3) & ~1;
}

static int pasemi_mac_setup_rx_resources(struct net_device *dev)
{
      struct pasemi_mac_rxring *ring;
      struct pasemi_mac *mac = netdev_priv(dev);
      int chan_id = mac->dma_rxch;
      unsigned int cfg;

      ring = kzalloc(sizeof(*ring), GFP_KERNEL);

      if (!ring)
            goto out_ring;

      spin_lock_init(&ring->lock);

      ring->size = RX_RING_SIZE;
      ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
                          RX_RING_SIZE, GFP_KERNEL);

      if (!ring->ring_info)
            goto out_ring_info;

      /* Allocate descriptors */
      ring->ring = dma_alloc_coherent(&mac->dma_pdev->dev,
                              RX_RING_SIZE * sizeof(u64),
                              &ring->dma, GFP_KERNEL);

      if (!ring->ring)
            goto out_ring_desc;

      memset(ring->ring, 0, RX_RING_SIZE * sizeof(u64));

      ring->buffers = dma_alloc_coherent(&mac->dma_pdev->dev,
                                 RX_RING_SIZE * sizeof(u64),
                                 &ring->buf_dma, GFP_KERNEL);
      if (!ring->buffers)
            goto out_buffers;

      memset(ring->buffers, 0, RX_RING_SIZE * sizeof(u64));

      write_dma_reg(mac, PAS_DMA_RXCHAN_BASEL(chan_id), PAS_DMA_RXCHAN_BASEL_BRBL(ring->dma));

      write_dma_reg(mac, PAS_DMA_RXCHAN_BASEU(chan_id),
                     PAS_DMA_RXCHAN_BASEU_BRBH(ring->dma >> 32) |
                     PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 3));

      cfg = PAS_DMA_RXCHAN_CFG_HBU(2);

      if (translation_enabled())
            cfg |= PAS_DMA_RXCHAN_CFG_CTR;

      write_dma_reg(mac, PAS_DMA_RXCHAN_CFG(chan_id), cfg);

      write_dma_reg(mac, PAS_DMA_RXINT_BASEL(mac->dma_if),
                     PAS_DMA_RXINT_BASEL_BRBL(ring->buf_dma));

      write_dma_reg(mac, PAS_DMA_RXINT_BASEU(mac->dma_if),
                     PAS_DMA_RXINT_BASEU_BRBH(ring->buf_dma >> 32) |
                     PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3));

      cfg = PAS_DMA_RXINT_CFG_DHL(3) | PAS_DMA_RXINT_CFG_L2 |
            PAS_DMA_RXINT_CFG_LW | PAS_DMA_RXINT_CFG_RBP |
            PAS_DMA_RXINT_CFG_HEN;

      if (translation_enabled())
            cfg |= PAS_DMA_RXINT_CFG_ITRR | PAS_DMA_RXINT_CFG_ITR;

      write_dma_reg(mac, PAS_DMA_RXINT_CFG(mac->dma_if), cfg);

      ring->next_to_fill = 0;
      ring->next_to_clean = 0;

      snprintf(ring->irq_name, sizeof(ring->irq_name),
             "%s rx", dev->name);
      mac->rx = ring;

      return 0;

out_buffers:
      dma_free_coherent(&mac->dma_pdev->dev,
                    RX_RING_SIZE * sizeof(u64),
                    mac->rx->ring, mac->rx->dma);
out_ring_desc:
      kfree(ring->ring_info);
out_ring_info:
      kfree(ring);
out_ring:
      return -ENOMEM;
}


static int pasemi_mac_setup_tx_resources(struct net_device *dev)
{
      struct pasemi_mac *mac = netdev_priv(dev);
      u32 val;
      int chan_id = mac->dma_txch;
      struct pasemi_mac_txring *ring;
      unsigned int cfg;

      ring = kzalloc(sizeof(*ring), GFP_KERNEL);
      if (!ring)
            goto out_ring;

      spin_lock_init(&ring->lock);

      ring->size = TX_RING_SIZE;
      ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
                          TX_RING_SIZE, GFP_KERNEL);
      if (!ring->ring_info)
            goto out_ring_info;

      /* Allocate descriptors */
      ring->ring = dma_alloc_coherent(&mac->dma_pdev->dev,
                              TX_RING_SIZE * sizeof(u64),
                              &ring->dma, GFP_KERNEL);
      if (!ring->ring)
            goto out_ring_desc;

      memset(ring->ring, 0, TX_RING_SIZE * sizeof(u64));

      write_dma_reg(mac, PAS_DMA_TXCHAN_BASEL(chan_id),
                     PAS_DMA_TXCHAN_BASEL_BRBL(ring->dma));
      val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->dma >> 32);
      val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 3);

      write_dma_reg(mac, PAS_DMA_TXCHAN_BASEU(chan_id), val);

      cfg = PAS_DMA_TXCHAN_CFG_TY_IFACE |
            PAS_DMA_TXCHAN_CFG_TATTR(mac->dma_if) |
            PAS_DMA_TXCHAN_CFG_UP |
            PAS_DMA_TXCHAN_CFG_WT(2);

      if (translation_enabled())
            cfg |= PAS_DMA_TXCHAN_CFG_TRD | PAS_DMA_TXCHAN_CFG_TRR;

      write_dma_reg(mac, PAS_DMA_TXCHAN_CFG(chan_id), cfg);

      ring->next_to_fill = 0;
      ring->next_to_clean = 0;

      snprintf(ring->irq_name, sizeof(ring->irq_name),
             "%s tx", dev->name);
      mac->tx = ring;

      return 0;

out_ring_desc:
      kfree(ring->ring_info);
out_ring_info:
      kfree(ring);
out_ring:
      return -ENOMEM;
}

static void pasemi_mac_free_tx_resources(struct net_device *dev)
{
      struct pasemi_mac *mac = netdev_priv(dev);
      unsigned int i, j;
      struct pasemi_mac_buffer *info;
      dma_addr_t dmas[MAX_SKB_FRAGS+1];
      int freed;
      int start, limit;

      start = mac->tx->next_to_clean;
      limit = mac->tx->next_to_fill;

      /* Compensate for when fill has wrapped and clean has not */
      if (start > limit)
            limit += TX_RING_SIZE;

      for (i = start; i < limit; i += freed) {
            info = &TX_RING_INFO(mac, i+1);
            if (info->dma && info->skb) {
                  for (j = 0; j <= skb_shinfo(info->skb)->nr_frags; j++)
                        dmas[j] = TX_RING_INFO(mac, i+1+j).dma;
                  freed = pasemi_mac_unmap_tx_skb(mac, info->skb, dmas);
            } else
                  freed = 2;
      }

      for (i = 0; i < TX_RING_SIZE; i++)
            TX_RING(mac, i) = 0;

      dma_free_coherent(&mac->dma_pdev->dev,
                    TX_RING_SIZE * sizeof(u64),
                    mac->tx->ring, mac->tx->dma);

      kfree(mac->tx->ring_info);
      kfree(mac->tx);
      mac->tx = NULL;
}

static void pasemi_mac_free_rx_resources(struct net_device *dev)
{
      struct pasemi_mac *mac = netdev_priv(dev);
      unsigned int i;
      struct pasemi_mac_buffer *info;

      for (i = 0; i < RX_RING_SIZE; i++) {
            info = &RX_RING_INFO(mac, i);
            if (info->skb && info->dma) {
                  pci_unmap_single(mac->dma_pdev,
                               info->dma,
                               info->skb->len,
                               PCI_DMA_FROMDEVICE);
                  dev_kfree_skb_any(info->skb);
            }
            info->dma = 0;
            info->skb = NULL;
      }

      for (i = 0; i < RX_RING_SIZE; i++)
            RX_RING(mac, i) = 0;

      dma_free_coherent(&mac->dma_pdev->dev,
                    RX_RING_SIZE * sizeof(u64),
                    mac->rx->ring, mac->rx->dma);

      dma_free_coherent(&mac->dma_pdev->dev, RX_RING_SIZE * sizeof(u64),
                    mac->rx->buffers, mac->rx->buf_dma);

      kfree(mac->rx->ring_info);
      kfree(mac->rx);
      mac->rx = NULL;
}

static void pasemi_mac_replenish_rx_ring(struct net_device *dev, int limit)
{
      struct pasemi_mac *mac = netdev_priv(dev);
      int fill, count;

      if (limit <= 0)
            return;

      fill = mac->rx->next_to_fill;
      for (count = 0; count < limit; count++) {
            struct pasemi_mac_buffer *info = &RX_RING_INFO(mac, fill);
            u64 *buff = &RX_BUFF(mac, fill);
            struct sk_buff *skb;
            dma_addr_t dma;

            /* Entry in use? */
            WARN_ON(*buff);

            /* skb might still be in there for recycle on short receives */
            if (info->skb)
                  skb = info->skb;
            else {
                  skb = dev_alloc_skb(BUF_SIZE);
                  skb_reserve(skb, LOCAL_SKB_ALIGN);
            }

            if (unlikely(!skb))
                  break;

            dma = pci_map_single(mac->dma_pdev, skb->data,
                             BUF_SIZE - LOCAL_SKB_ALIGN,
                             PCI_DMA_FROMDEVICE);

            if (unlikely(dma_mapping_error(dma))) {
                  dev_kfree_skb_irq(info->skb);
                  break;
            }

            info->skb = skb;
            info->dma = dma;
            *buff = XCT_RXB_LEN(BUF_SIZE) | XCT_RXB_ADDR(dma);
            fill++;
      }

      wmb();

      write_dma_reg(mac, PAS_DMA_RXINT_INCR(mac->dma_if), count);

      mac->rx->next_to_fill = (mac->rx->next_to_fill + count) &
                        (RX_RING_SIZE - 1);
}

static void pasemi_mac_restart_rx_intr(struct pasemi_mac *mac)
{
      unsigned int reg, pcnt;
      /* Re-enable packet count interrupts: finally
       * ack the packet count interrupt we got in rx_intr.
       */

      pcnt = *mac->rx_status & PAS_STATUS_PCNT_M;

      reg = PAS_IOB_DMA_RXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_RXCH_RESET_PINTC;

      write_iob_reg(mac, PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch), reg);
}

static void pasemi_mac_restart_tx_intr(struct pasemi_mac *mac)
{
      unsigned int reg, pcnt;

      /* Re-enable packet count interrupts */
      pcnt = *mac->tx_status & PAS_STATUS_PCNT_M;

      reg = PAS_IOB_DMA_TXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_TXCH_RESET_PINTC;

      write_iob_reg(mac, PAS_IOB_DMA_TXCH_RESET(mac->dma_txch), reg);
}


static inline void pasemi_mac_rx_error(struct pasemi_mac *mac, u64 macrx)
{
      unsigned int rcmdsta, ccmdsta;

      if (!netif_msg_rx_err(mac))
            return;

      rcmdsta = read_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
      ccmdsta = read_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch));

      printk(KERN_ERR "pasemi_mac: rx error. macrx %016lx, rx status %lx\n",
            macrx, *mac->rx_status);

      printk(KERN_ERR "pasemi_mac: rcmdsta %08x ccmdsta %08x\n",
            rcmdsta, ccmdsta);
}

static inline void pasemi_mac_tx_error(struct pasemi_mac *mac, u64 mactx)
{
      unsigned int cmdsta;

      if (!netif_msg_tx_err(mac))
            return;

      cmdsta = read_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch));

      printk(KERN_ERR "pasemi_mac: tx error. mactx 0x%016lx, "\
            "tx status 0x%016lx\n", mactx, *mac->tx_status);

      printk(KERN_ERR "pasemi_mac: tcmdsta 0x%08x\n", cmdsta);
}

static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
{
      unsigned int n;
      int count;
      struct pasemi_mac_buffer *info;
      struct sk_buff *skb;
      unsigned int len;
      u64 macrx;
      dma_addr_t dma;
      int buf_index;
      u64 eval;

      spin_lock(&mac->rx->lock);

      n = mac->rx->next_to_clean;

      prefetch(&RX_RING(mac, n));

      for (count = 0; count < limit; count++) {
            macrx = RX_RING(mac, n);

            if ((macrx & XCT_MACRX_E) ||
                (*mac->rx_status & PAS_STATUS_ERROR))
                  pasemi_mac_rx_error(mac, macrx);

            if (!(macrx & XCT_MACRX_O))
                  break;

            info = NULL;

            BUG_ON(!(macrx & XCT_MACRX_RR_8BRES));

            eval = (RX_RING(mac, n+1) & XCT_RXRES_8B_EVAL_M) >>
                  XCT_RXRES_8B_EVAL_S;
            buf_index = eval-1;

            dma = (RX_RING(mac, n+2) & XCT_PTR_ADDR_M);
            info = &RX_RING_INFO(mac, buf_index);

            skb = info->skb;

            prefetch(skb);
            prefetch(&skb->data_len);

            len = (macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;

            pci_unmap_single(mac->dma_pdev, dma, len, PCI_DMA_FROMDEVICE);

            if (macrx & XCT_MACRX_CRC) {
                  /* CRC error flagged */
                  mac->netdev->stats.rx_errors++;
                  mac->netdev->stats.rx_crc_errors++;
                  /* No need to free skb, it'll be reused */
                  goto next;
            }

            if (len < 256) {
                  struct sk_buff *new_skb;

                  new_skb = netdev_alloc_skb(mac->netdev,
                                       len + LOCAL_SKB_ALIGN);
                  if (new_skb) {
                        skb_reserve(new_skb, LOCAL_SKB_ALIGN);
                        memcpy(new_skb->data, skb->data, len);
                        /* save the skb in buffer_info as good */
                        skb = new_skb;
                  }
                  /* else just continue with the old one */
            } else
                  info->skb = NULL;

            info->dma = 0;

            /* Don't include CRC */
            skb_put(skb, len-4);

            if (likely((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK)) {
                  skb->ip_summed = CHECKSUM_UNNECESSARY;
                  skb->csum = (macrx & XCT_MACRX_CSUM_M) >>
                                 XCT_MACRX_CSUM_S;
            } else
                  skb->ip_summed = CHECKSUM_NONE;

            mac->netdev->stats.rx_bytes += len;
            mac->netdev->stats.rx_packets++;

            skb->protocol = eth_type_trans(skb, mac->netdev);
            netif_receive_skb(skb);

next:
            RX_RING(mac, n) = 0;
            RX_RING(mac, n+1) = 0;

            /* Need to zero it out since hardware doesn't, since the
             * replenish loop uses it to tell when it's done.
             */
            RX_BUFF(mac, buf_index) = 0;

            n += 4;
      }

      if (n > RX_RING_SIZE) {
            /* Errata 5971 workaround: L2 target of headers */
            write_iob_reg(mac, PAS_IOB_COM_PKTHDRCNT, 0);
            n &= (RX_RING_SIZE-1);
      }

      mac->rx->next_to_clean = n;

      /* Increase is in number of 16-byte entries, and since each descriptor
       * with an 8BRES takes up 3x8 bytes (padded to 4x8), increase with
       * count*2.
       */
      write_dma_reg(mac, PAS_DMA_RXCHAN_INCR(mac->dma_rxch), count << 1);

      pasemi_mac_replenish_rx_ring(mac->netdev, count);

      spin_unlock(&mac->rx->lock);

      return count;
}

/* Can't make this too large or we blow the kernel stack limits */
#define TX_CLEAN_BATCHSIZE (128/MAX_SKB_FRAGS)

static int pasemi_mac_clean_tx(struct pasemi_mac *mac)
{
      int i, j;
      unsigned int start, descr_count, buf_count, batch_limit;
      unsigned int ring_limit;
      unsigned int total_count;
      unsigned long flags;
      struct sk_buff *skbs[TX_CLEAN_BATCHSIZE];
      dma_addr_t dmas[TX_CLEAN_BATCHSIZE][MAX_SKB_FRAGS+1];

      total_count = 0;
      batch_limit = TX_CLEAN_BATCHSIZE;
restart:
      spin_lock_irqsave(&mac->tx->lock, flags);

      start = mac->tx->next_to_clean;
      ring_limit = mac->tx->next_to_fill;

      /* Compensate for when fill has wrapped but clean has not */
      if (start > ring_limit)
            ring_limit += TX_RING_SIZE;

      buf_count = 0;
      descr_count = 0;

      for (i = start;
           descr_count < batch_limit && i < ring_limit;
           i += buf_count) {
            u64 mactx = TX_RING(mac, i);
            struct sk_buff *skb;

            if ((mactx  & XCT_MACTX_E) ||
                (*mac->tx_status & PAS_STATUS_ERROR))
                  pasemi_mac_tx_error(mac, mactx);

            if (unlikely(mactx & XCT_MACTX_O))
                  /* Not yet transmitted */
                  break;

            skb = TX_RING_INFO(mac, i+1).skb;
            skbs[descr_count] = skb;

            buf_count = 2 + skb_shinfo(skb)->nr_frags;
            for (j = 0; j <= skb_shinfo(skb)->nr_frags; j++)
                  dmas[descr_count][j] = TX_RING_INFO(mac, i+1+j).dma;

            TX_RING(mac, i) = 0;
            TX_RING(mac, i+1) = 0;

            /* Since we always fill with an even number of entries, make
             * sure we skip any unused one at the end as well.
             */
            if (buf_count & 1)
                  buf_count++;
            descr_count++;
      }
      mac->tx->next_to_clean = i & (TX_RING_SIZE-1);

      spin_unlock_irqrestore(&mac->tx->lock, flags);
      netif_wake_queue(mac->netdev);

      for (i = 0; i < descr_count; i++)
            pasemi_mac_unmap_tx_skb(mac, skbs[i], dmas[i]);

      total_count += descr_count;

      /* If the batch was full, try to clean more */
      if (descr_count == batch_limit)
            goto restart;

      return total_count;
}


static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
{
      struct net_device *dev = data;
      struct pasemi_mac *mac = netdev_priv(dev);
      unsigned int reg;

      if (!(*mac->rx_status & PAS_STATUS_CAUSE_M))
            return IRQ_NONE;

      /* Don't reset packet count so it won't fire again but clear
       * all others.
       */

      reg = 0;
      if (*mac->rx_status & PAS_STATUS_SOFT)
            reg |= PAS_IOB_DMA_RXCH_RESET_SINTC;
      if (*mac->rx_status & PAS_STATUS_ERROR)
            reg |= PAS_IOB_DMA_RXCH_RESET_DINTC;
      if (*mac->rx_status & PAS_STATUS_TIMER)
            reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;

      netif_rx_schedule(dev, &mac->napi);

      write_iob_reg(mac, PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch), reg);

      return IRQ_HANDLED;
}

static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
{
      struct net_device *dev = data;
      struct pasemi_mac *mac = netdev_priv(dev);
      unsigned int reg, pcnt;

      if (!(*mac->tx_status & PAS_STATUS_CAUSE_M))
            return IRQ_NONE;

      pasemi_mac_clean_tx(mac);

      pcnt = *mac->tx_status & PAS_STATUS_PCNT_M;

      reg = PAS_IOB_DMA_TXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_TXCH_RESET_PINTC;

      if (*mac->tx_status & PAS_STATUS_SOFT)
            reg |= PAS_IOB_DMA_TXCH_RESET_SINTC;
      if (*mac->tx_status & PAS_STATUS_ERROR)
            reg |= PAS_IOB_DMA_TXCH_RESET_DINTC;

      write_iob_reg(mac, PAS_IOB_DMA_TXCH_RESET(mac->dma_txch), reg);

      return IRQ_HANDLED;
}

static void pasemi_adjust_link(struct net_device *dev)
{
      struct pasemi_mac *mac = netdev_priv(dev);
      int msg;
      unsigned int flags;
      unsigned int new_flags;

      if (!mac->phydev->link) {
            /* If no link, MAC speed settings don't matter. Just report
             * link down and return.
             */
            if (mac->link && netif_msg_link(mac))
                  printk(KERN_INFO "%s: Link is down.\n", dev->name);

            netif_carrier_off(dev);
            mac->link = 0;

            return;
      } else
            netif_carrier_on(dev);

      flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
      new_flags = flags & ~(PAS_MAC_CFG_PCFG_HD | PAS_MAC_CFG_PCFG_SPD_M |
                        PAS_MAC_CFG_PCFG_TSR_M);

      if (!mac->phydev->duplex)
            new_flags |= PAS_MAC_CFG_PCFG_HD;

      switch (mac->phydev->speed) {
      case 1000:
            new_flags |= PAS_MAC_CFG_PCFG_SPD_1G |
                       PAS_MAC_CFG_PCFG_TSR_1G;
            break;
      case 100:
            new_flags |= PAS_MAC_CFG_PCFG_SPD_100M |
                       PAS_MAC_CFG_PCFG_TSR_100M;
            break;
      case 10:
            new_flags |= PAS_MAC_CFG_PCFG_SPD_10M |
                       PAS_MAC_CFG_PCFG_TSR_10M;
            break;
      default:
            printk("Unsupported speed %d\n", mac->phydev->speed);
      }

      /* Print on link or speed/duplex change */
      msg = mac->link != mac->phydev->link || flags != new_flags;

      mac->duplex = mac->phydev->duplex;
      mac->speed = mac->phydev->speed;
      mac->link = mac->phydev->link;

      if (new_flags != flags)
            write_mac_reg(mac, PAS_MAC_CFG_PCFG, new_flags);

      if (msg && netif_msg_link(mac))
            printk(KERN_INFO "%s: Link is up at %d Mbps, %s duplex.\n",
                   dev->name, mac->speed, mac->duplex ? "full" : "half");
}

static int pasemi_mac_phy_init(struct net_device *dev)
{
      struct pasemi_mac *mac = netdev_priv(dev);
      struct device_node *dn, *phy_dn;
      struct phy_device *phydev;
      unsigned int phy_id;
      const phandle *ph;
      const unsigned int *prop;
      struct resource r;
      int ret;

      dn = pci_device_to_OF_node(mac->pdev);
      ph = of_get_property(dn, "phy-handle", NULL);
      if (!ph)
            return -ENODEV;
      phy_dn = of_find_node_by_phandle(*ph);

      prop = of_get_property(phy_dn, "reg", NULL);
      ret = of_address_to_resource(phy_dn->parent, 0, &r);
      if (ret)
            goto err;

      phy_id = *prop;
      snprintf(mac->phy_id, BUS_ID_SIZE, PHY_ID_FMT, (int)r.start, phy_id);

      of_node_put(phy_dn);

      mac->link = 0;
      mac->speed = 0;
      mac->duplex = -1;

      phydev = phy_connect(dev, mac->phy_id, &pasemi_adjust_link, 0, PHY_INTERFACE_MODE_SGMII);

      if (IS_ERR(phydev)) {
            printk(KERN_ERR "%s: Could not attach to phy\n", dev->name);
            return PTR_ERR(phydev);
      }

      mac->phydev = phydev;

      return 0;

err:
      of_node_put(phy_dn);
      return -ENODEV;
}


static int pasemi_mac_open(struct net_device *dev)
{
      struct pasemi_mac *mac = netdev_priv(dev);
      int base_irq;
      unsigned int flags;
      int ret;

      /* enable rx section */
      write_dma_reg(mac, PAS_DMA_COM_RXCMD, PAS_DMA_COM_RXCMD_EN);

      /* enable tx section */
      write_dma_reg(mac, PAS_DMA_COM_TXCMD, PAS_DMA_COM_TXCMD_EN);

      flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) |
            PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) |
            PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12);

      write_mac_reg(mac, PAS_MAC_CFG_TXP, flags);

      write_iob_reg(mac, PAS_IOB_DMA_RXCH_CFG(mac->dma_rxch),
                     PAS_IOB_DMA_RXCH_CFG_CNTTH(0));

      write_iob_reg(mac, PAS_IOB_DMA_TXCH_CFG(mac->dma_txch),
                     PAS_IOB_DMA_TXCH_CFG_CNTTH(128));

      /* Clear out any residual packet count state from firmware */
      pasemi_mac_restart_rx_intr(mac);
      pasemi_mac_restart_tx_intr(mac);

      /* 0xffffff is max value, about 16ms */
      write_iob_reg(mac, PAS_IOB_DMA_COM_TIMEOUTCFG,
                     PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0xffffff));

      ret = pasemi_mac_setup_rx_resources(dev);
      if (ret)
            goto out_rx_resources;

      ret = pasemi_mac_setup_tx_resources(dev);
      if (ret)
            goto out_tx_resources;

      write_mac_reg(mac, PAS_MAC_IPC_CHNL,
                     PAS_MAC_IPC_CHNL_DCHNO(mac->dma_rxch) |
                     PAS_MAC_IPC_CHNL_BCH(mac->dma_rxch));

      /* enable rx if */
      write_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
                     PAS_DMA_RXINT_RCMDSTA_EN |
                     PAS_DMA_RXINT_RCMDSTA_DROPS_M |
                     PAS_DMA_RXINT_RCMDSTA_BP |
                     PAS_DMA_RXINT_RCMDSTA_OO |
                     PAS_DMA_RXINT_RCMDSTA_BT);

      /* enable rx channel */
      write_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
                     PAS_DMA_RXCHAN_CCMDSTA_EN |
                     PAS_DMA_RXCHAN_CCMDSTA_DU |
                     PAS_DMA_RXCHAN_CCMDSTA_OD |
                     PAS_DMA_RXCHAN_CCMDSTA_FD |
                     PAS_DMA_RXCHAN_CCMDSTA_DT);

      /* enable tx channel */
      write_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
                     PAS_DMA_TXCHAN_TCMDSTA_EN |
                     PAS_DMA_TXCHAN_TCMDSTA_SZ |
                     PAS_DMA_TXCHAN_TCMDSTA_DB |
                     PAS_DMA_TXCHAN_TCMDSTA_DE |
                     PAS_DMA_TXCHAN_TCMDSTA_DA);

      pasemi_mac_replenish_rx_ring(dev, RX_RING_SIZE);

      write_dma_reg(mac, PAS_DMA_RXCHAN_INCR(mac->dma_rxch), RX_RING_SIZE>>1);

      flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PE |
            PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;

      if (mac->type == MAC_TYPE_GMAC)
            flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
      else
            flags |= PAS_MAC_CFG_PCFG_TSR_10G | PAS_MAC_CFG_PCFG_SPD_10G;

      /* Enable interface in MAC */
      write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);

      ret = pasemi_mac_phy_init(dev);
      /* Some configs don't have PHYs (XAUI etc), so don't complain about
       * failed init due to -ENODEV.
       */
      if (ret && ret != -ENODEV)
            dev_warn(&mac->pdev->dev, "phy init failed: %d\n", ret);

      netif_start_queue(dev);
      napi_enable(&mac->napi);

      /* Interrupts are a bit different for our DMA controller: While
       * it's got one a regular PCI device header, the interrupt there
       * is really the base of the range it's using. Each tx and rx
       * channel has it's own interrupt source.
       */

      base_irq = virq_to_hw(mac->dma_pdev->irq);

      mac->tx_irq = irq_create_mapping(NULL, base_irq + mac->dma_txch);
      mac->rx_irq = irq_create_mapping(NULL, base_irq + 20 + mac->dma_txch);

      ret = request_irq(mac->tx_irq, &pasemi_mac_tx_intr, IRQF_DISABLED,
                    mac->tx->irq_name, dev);
      if (ret) {
            dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
                  base_irq + mac->dma_txch, ret);
            goto out_tx_int;
      }

      ret = request_irq(mac->rx_irq, &pasemi_mac_rx_intr, IRQF_DISABLED,
                    mac->rx->irq_name, dev);
      if (ret) {
            dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
                  base_irq + 20 + mac->dma_rxch, ret);
            goto out_rx_int;
      }

      if (mac->phydev)
            phy_start(mac->phydev);

      return 0;

out_rx_int:
      free_irq(mac->tx_irq, dev);
out_tx_int:
      napi_disable(&mac->napi);
      netif_stop_queue(dev);
      pasemi_mac_free_tx_resources(dev);
out_tx_resources:
      pasemi_mac_free_rx_resources(dev);
out_rx_resources:

      return ret;
}

#define MAX_RETRIES 5000

static int pasemi_mac_close(struct net_device *dev)
{
      struct pasemi_mac *mac = netdev_priv(dev);
      unsigned int sta;
      int retries;

      if (mac->phydev) {
            phy_stop(mac->phydev);
            phy_disconnect(mac->phydev);
      }

      netif_stop_queue(dev);
      napi_disable(&mac->napi);

      sta = read_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
      if (sta & (PAS_DMA_RXINT_RCMDSTA_BP |
                  PAS_DMA_RXINT_RCMDSTA_OO |
                  PAS_DMA_RXINT_RCMDSTA_BT))
            printk(KERN_DEBUG "pasemi_mac: rcmdsta error: 0x%08x\n", sta);

      sta = read_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch));
      if (sta & (PAS_DMA_RXCHAN_CCMDSTA_DU |
                 PAS_DMA_RXCHAN_CCMDSTA_OD |
                 PAS_DMA_RXCHAN_CCMDSTA_FD |
                 PAS_DMA_RXCHAN_CCMDSTA_DT))
            printk(KERN_DEBUG "pasemi_mac: ccmdsta error: 0x%08x\n", sta);

      sta = read_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch));
      if (sta & (PAS_DMA_TXCHAN_TCMDSTA_SZ |
                  PAS_DMA_TXCHAN_TCMDSTA_DB |
                  PAS_DMA_TXCHAN_TCMDSTA_DE |
                  PAS_DMA_TXCHAN_TCMDSTA_DA))
            printk(KERN_DEBUG "pasemi_mac: tcmdsta error: 0x%08x\n", sta);

      /* Clean out any pending buffers */
      pasemi_mac_clean_tx(mac);
      pasemi_mac_clean_rx(mac, RX_RING_SIZE);

      /* Disable interface */
      write_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), PAS_DMA_TXCHAN_TCMDSTA_ST);
      write_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if), PAS_DMA_RXINT_RCMDSTA_ST);
      write_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), PAS_DMA_RXCHAN_CCMDSTA_ST);

      for (retries = 0; retries < MAX_RETRIES; retries++) {
            sta = read_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch));
            if (!(sta & PAS_DMA_TXCHAN_TCMDSTA_ACT))
                  break;
            cond_resched();
      }

      if (sta & PAS_DMA_TXCHAN_TCMDSTA_ACT)
            dev_err(&mac->dma_pdev->dev, "Failed to stop tx channel\n");

      for (retries = 0; retries < MAX_RETRIES; retries++) {
            sta = read_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch));
            if (!(sta & PAS_DMA_RXCHAN_CCMDSTA_ACT))
                  break;
            cond_resched();
      }

      if (sta & PAS_DMA_RXCHAN_CCMDSTA_ACT)
            dev_err(&mac->dma_pdev->dev, "Failed to stop rx channel\n");

      for (retries = 0; retries < MAX_RETRIES; retries++) {
            sta = read_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
            if (!(sta & PAS_DMA_RXINT_RCMDSTA_ACT))
                  break;
            cond_resched();
      }

      if (sta & PAS_DMA_RXINT_RCMDSTA_ACT)
            dev_err(&mac->dma_pdev->dev, "Failed to stop rx interface\n");

      /* Then, disable the channel. This must be done separately from
       * stopping, since you can't disable when active.
       */

      write_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), 0);
      write_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), 0);
      write_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);

      free_irq(mac->tx_irq, dev);
      free_irq(mac->rx_irq, dev);

      /* Free resources */
      pasemi_mac_free_rx_resources(dev);
      pasemi_mac_free_tx_resources(dev);

      return 0;
}

static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
{
      struct pasemi_mac *mac = netdev_priv(dev);
      struct pasemi_mac_txring *txring;
      u64 dflags, mactx;
      dma_addr_t map[MAX_SKB_FRAGS+1];
      unsigned int map_size[MAX_SKB_FRAGS+1];
      unsigned long flags;
      int i, nfrags;

      dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_CRC_PAD;

      if (skb->ip_summed == CHECKSUM_PARTIAL) {
            const unsigned char *nh = skb_network_header(skb);

            switch (ip_hdr(skb)->protocol) {
            case IPPROTO_TCP:
                  dflags |= XCT_MACTX_CSUM_TCP;
                  dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
                  dflags |= XCT_MACTX_IPO(nh - skb->data);
                  break;
            case IPPROTO_UDP:
                  dflags |= XCT_MACTX_CSUM_UDP;
                  dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
                  dflags |= XCT_MACTX_IPO(nh - skb->data);
                  break;
            }
      }

      nfrags = skb_shinfo(skb)->nr_frags;

      map[0] = pci_map_single(mac->dma_pdev, skb->data, skb_headlen(skb),
                        PCI_DMA_TODEVICE);
      map_size[0] = skb_headlen(skb);
      if (dma_mapping_error(map[0]))
            goto out_err_nolock;

      for (i = 0; i < nfrags; i++) {
            skb_frag_t *frag = &skb_shinfo(skb)->frags[i];

            map[i+1] = pci_map_page(mac->dma_pdev, frag->page,
                              frag->page_offset, frag->size,
                              PCI_DMA_TODEVICE);
            map_size[i+1] = frag->size;
            if (dma_mapping_error(map[i+1])) {
                  nfrags = i;
                  goto out_err_nolock;
            }
      }

      mactx = dflags | XCT_MACTX_LLEN(skb->len);

      txring = mac->tx;

      spin_lock_irqsave(&txring->lock, flags);

      /* Avoid stepping on the same cache line that the DMA controller
       * is currently about to send, so leave at least 8 words available.
       * Total free space needed is mactx + fragments + 8
       */
      if (RING_AVAIL(txring) < nfrags + 10) {
            /* no room -- stop the queue and wait for tx intr */
            netif_stop_queue(dev);
            goto out_err;
      }

      TX_RING(mac, txring->next_to_fill) = mactx;
      txring->next_to_fill++;
      TX_RING_INFO(mac, txring->next_to_fill).skb = skb;
      for (i = 0; i <= nfrags; i++) {
            TX_RING(mac, txring->next_to_fill+i) =
            XCT_PTR_LEN(map_size[i]) | XCT_PTR_ADDR(map[i]);
            TX_RING_INFO(mac, txring->next_to_fill+i).dma = map[i];
      }

      /* We have to add an even number of 8-byte entries to the ring
       * even if the last one is unused. That means always an odd number
       * of pointers + one mactx descriptor.
       */
      if (nfrags & 1)
            nfrags++;

      txring->next_to_fill = (txring->next_to_fill + nfrags + 1) &
                        (TX_RING_SIZE-1);

      dev->stats.tx_packets++;
      dev->stats.tx_bytes += skb->len;

      spin_unlock_irqrestore(&txring->lock, flags);

      write_dma_reg(mac, PAS_DMA_TXCHAN_INCR(mac->dma_txch), (nfrags+2) >> 1);

      return NETDEV_TX_OK;

out_err:
      spin_unlock_irqrestore(&txring->lock, flags);
out_err_nolock:
      while (nfrags--)
            pci_unmap_single(mac->dma_pdev, map[nfrags], map_size[nfrags],
                         PCI_DMA_TODEVICE);

      return NETDEV_TX_BUSY;
}

static void pasemi_mac_set_rx_mode(struct net_device *dev)
{
      struct pasemi_mac *mac = netdev_priv(dev);
      unsigned int flags;

      flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);

      /* Set promiscuous */
      if (dev->flags & IFF_PROMISC)
            flags |= PAS_MAC_CFG_PCFG_PR;
      else
            flags &= ~PAS_MAC_CFG_PCFG_PR;

      write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
}


static int pasemi_mac_poll(struct napi_struct *napi, int budget)
{
      struct pasemi_mac *mac = container_of(napi, struct pasemi_mac, napi);
      struct net_device *dev = mac->netdev;
      int pkts;

      pasemi_mac_clean_tx(mac);
      pkts = pasemi_mac_clean_rx(mac, budget);
      if (pkts < budget) {
            /* all done, no more packets present */
            netif_rx_complete(dev, napi);

            pasemi_mac_restart_rx_intr(mac);
      }
      return pkts;
}

static void __iomem * __devinit map_onedev(struct pci_dev *p, int index)
{
      struct device_node *dn;
      void __iomem *ret;

      dn = pci_device_to_OF_node(p);
      if (!dn)
            goto fallback;

      ret = of_iomap(dn, index);
      if (!ret)
            goto fallback;

      return ret;
fallback:
      /* This is hardcoded and ugly, but we have some firmware versions
       * that don't provide the register space in the device tree. Luckily
       * they are at well-known locations so we can just do the math here.
       */
      return ioremap(0xe0000000 + (p->devfn << 12), 0x2000);
}

static int __devinit pasemi_mac_map_regs(struct pasemi_mac *mac)
{
      struct resource res;
      struct device_node *dn;
      int err;

      mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
      if (!mac->dma_pdev) {
            dev_err(&mac->pdev->dev, "Can't find DMA Controller\n");
            return -ENODEV;
      }

      mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
      if (!mac->iob_pdev) {
            dev_err(&mac->pdev->dev, "Can't find I/O Bridge\n");
            return -ENODEV;
      }

      mac->regs = map_onedev(mac->pdev, 0);
      mac->dma_regs = map_onedev(mac->dma_pdev, 0);
      mac->iob_regs = map_onedev(mac->iob_pdev, 0);

      if (!mac->regs || !mac->dma_regs || !mac->iob_regs) {
            dev_err(&mac->pdev->dev, "Can't map registers\n");
            return -ENODEV;
      }

      /* The dma status structure is located in the I/O bridge, and
       * is cache coherent.
       */
      if (!dma_status) {
            dn = pci_device_to_OF_node(mac->iob_pdev);
            if (dn)
                  err = of_address_to_resource(dn, 1, &res);
            if (!dn || err) {
                  /* Fallback for old firmware */
                  res.start = 0xfd800000;
                  res.end = res.start + 0x1000;
            }
            dma_status = __ioremap(res.start, res.end-res.start, 0);
      }

      return 0;
}

static int __devinit
pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
      static int index = 0;
      struct net_device *dev;
      struct pasemi_mac *mac;
      int err;
      DECLARE_MAC_BUF(mac_buf);

      err = pci_enable_device(pdev);
      if (err)
            return err;

      dev = alloc_etherdev(sizeof(struct pasemi_mac));
      if (dev == NULL) {
            dev_err(&pdev->dev,
                  "pasemi_mac: Could not allocate ethernet device.\n");
            err = -ENOMEM;
            goto out_disable_device;
      }

      pci_set_drvdata(pdev, dev);
      SET_NETDEV_DEV(dev, &pdev->dev);

      mac = netdev_priv(dev);

      mac->pdev = pdev;
      mac->netdev = dev;

      netif_napi_add(dev, &mac->napi, pasemi_mac_poll, 64);

      dev->features = NETIF_F_IP_CSUM | NETIF_F_LLTX | NETIF_F_SG;

      /* These should come out of the device tree eventually */
      mac->dma_txch = index;
      mac->dma_rxch = index;

      /* We probe GMAC before XAUI, but the DMA interfaces are
       * in XAUI, GMAC order.
       */
      if (index < 4)
            mac->dma_if = index + 2;
      else
            mac->dma_if = index - 4;
      index++;

      switch (pdev->device) {
      case 0xa005:
            mac->type = MAC_TYPE_GMAC;
            break;
      case 0xa006:
            mac->type = MAC_TYPE_XAUI;
            break;
      default:
            err = -ENODEV;
            goto out;
      }

      /* get mac addr from device tree */
      if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) {
            err = -ENODEV;
            goto out;
      }
      memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr));

      dev->open = pasemi_mac_open;
      dev->stop = pasemi_mac_close;
      dev->hard_start_xmit = pasemi_mac_start_tx;
      dev->set_multicast_list = pasemi_mac_set_rx_mode;

      err = pasemi_mac_map_regs(mac);
      if (err)
            goto out;

      mac->rx_status = &dma_status->rx_sta[mac->dma_rxch];
      mac->tx_status = &dma_status->tx_sta[mac->dma_txch];

      mac->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);

      /* Enable most messages by default */
      mac->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;

      err = register_netdev(dev);

      if (err) {
            dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n",
                  err);
            goto out;
      } else if netif_msg_probe(mac)
            printk(KERN_INFO "%s: PA Semi %s: intf %d, txch %d, rxch %d, "
                   "hw addr %s\n",
                   dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
                   mac->dma_if, mac->dma_txch, mac->dma_rxch,
                   print_mac(mac_buf, dev->dev_addr));

      return err;

out:
      if (mac->iob_pdev)
            pci_dev_put(mac->iob_pdev);
      if (mac->dma_pdev)
            pci_dev_put(mac->dma_pdev);
      if (mac->dma_regs)
            iounmap(mac->dma_regs);
      if (mac->iob_regs)
            iounmap(mac->iob_regs);
      if (mac->regs)
            iounmap(mac->regs);

      free_netdev(dev);
out_disable_device:
      pci_disable_device(pdev);
      return err;

}

static void __devexit pasemi_mac_remove(struct pci_dev *pdev)
{
      struct net_device *netdev = pci_get_drvdata(pdev);
      struct pasemi_mac *mac;

      if (!netdev)
            return;

      mac = netdev_priv(netdev);

      unregister_netdev(netdev);

      pci_disable_device(pdev);
      pci_dev_put(mac->dma_pdev);
      pci_dev_put(mac->iob_pdev);

      iounmap(mac->regs);
      iounmap(mac->dma_regs);
      iounmap(mac->iob_regs);

      pci_set_drvdata(pdev, NULL);
      free_netdev(netdev);
}

static struct pci_device_id pasemi_mac_pci_tbl[] = {
      { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) },
      { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) },
      { },
};

MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl);

static struct pci_driver pasemi_mac_driver = {
      .name       = "pasemi_mac",
      .id_table   = pasemi_mac_pci_tbl,
      .probe            = pasemi_mac_probe,
      .remove           = __devexit_p(pasemi_mac_remove),
};

static void __exit pasemi_mac_cleanup_module(void)
{
      pci_unregister_driver(&pasemi_mac_driver);
      __iounmap(dma_status);
      dma_status = NULL;
}

int pasemi_mac_init_module(void)
{
      return pci_register_driver(&pasemi_mac_driver);
}

module_init(pasemi_mac_init_module);
module_exit(pasemi_mac_cleanup_module);

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