text: /*
   * 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, see <http://www.gnu.org/licenses/>.
   */
  
  #include <linux/module.h>
  #include <linux/pci.h>
  #include <linux/slab.h>
  #include <linux/interrupt.h>
  #include <linux/dmaengine.h>
  #include <linux/delay.h>
  #include <linux/netdevice.h>
  #include <linux/of_mdio.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 <linux/inet_lro.h>
  #include <linux/prefetch.h>
  
  #include <asm/irq.h>
  #include <asm/firmware.h>
  #include <asm/pasemi_dma.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
   */
  
  #define LRO_MAX_AGGR 64
  
  #define PE_MIN_MTU	64
  #define PE_MAX_MTU	9000
  #define PE_DEF_MTU	ETH_DATA_LEN
  
  #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)
  
  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");
  
  extern const struct ethtool_ops pasemi_mac_ethtool_ops;
  
  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(unsigned int reg, unsigned int val)
  {
  	pasemi_write_iob_reg(reg, val);
  }
  
  static unsigned int read_mac_reg(const struct pasemi_mac *mac, unsigned int reg)
  {
  	return pasemi_read_mac_reg(mac->dma_if, reg);
  }
  
  static void write_mac_reg(const struct pasemi_mac *mac, unsigned int reg,
  			  unsigned int val)
  {
  	pasemi_write_mac_reg(mac->dma_if, reg, val);
  }
  
  static unsigned int read_dma_reg(unsigned int reg)
  {
  	return pasemi_read_dma_reg(reg);
  }
  
  static void write_dma_reg(unsigned int reg, unsigned int val)
  {
  	pasemi_write_dma_reg(reg, val);
  }
  
  static struct pasemi_mac_rxring *rx_ring(const struct pasemi_mac *mac)
  {
  	return mac->rx;
  }
  
  static struct pasemi_mac_txring *tx_ring(const struct pasemi_mac *mac)
  {
  	return mac->tx;
  }
  
  static inline void prefetch_skb(const struct sk_buff *skb)
  {
  	const void *d = skb;
  
  	prefetch(d);
  	prefetch(d+64);
  	prefetch(d+128);
  	prefetch(d+192);
  }
  
  static int mac_to_intf(struct pasemi_mac *mac)
  {
  	struct pci_dev *pdev = mac->pdev;
  	u32 tmp;
  	int nintf, off, i, j;
  	int devfn = pdev->devfn;
  
  	tmp = read_dma_reg(PAS_DMA_CAP_IFI);
  	nintf = (tmp & PAS_DMA_CAP_IFI_NIN_M) >> PAS_DMA_CAP_IFI_NIN_S;
  	off = (tmp & PAS_DMA_CAP_IFI_IOFF_M) >> PAS_DMA_CAP_IFI_IOFF_S;
  
  	/* IOFF contains the offset to the registers containing the
  	 * DMA interface-to-MAC-pci-id mappings, and NIN contains number
  	 * of total interfaces. Each register contains 4 devfns.
  	 * Just do a linear search until we find the devfn of the MAC
  	 * we're trying to look up.
  	 */
  
  	for (i = 0; i < (nintf+3)/4; i++) {
  		tmp = read_dma_reg(off+4*i);
  		for (j = 0; j < 4; j++) {
  			if (((tmp >> (8*j)) & 0xff) == devfn)
  				return i*4 + j;
  		}
  	}
  	return -1;
  }
  
  static void pasemi_mac_intf_disable(struct pasemi_mac *mac)
  {
  	unsigned int flags;
  
  	flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
  	flags &= ~PAS_MAC_CFG_PCFG_PE;
  	write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
  }
  
  static void pasemi_mac_intf_enable(struct pasemi_mac *mac)
  {
  	unsigned int flags;
  
  	flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
  	flags |= PAS_MAC_CFG_PCFG_PE;
  	write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
  }
  
  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[ETH_ALEN];
  
  	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 == ETH_ALEN) {
  		memcpy(mac->mac_addr, maddr, ETH_ALEN);
  		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])
  	    != ETH_ALEN) {
  		dev_warn(&pdev->dev,
  			 "can't parse mac address, not configuring\n");
  		return -EINVAL;
  	}
  
  	memcpy(mac->mac_addr, addr, ETH_ALEN);
  
  	return 0;
  }
  
  static int pasemi_mac_set_mac_addr(struct net_device *dev, void *p)
  {
  	struct pasemi_mac *mac = netdev_priv(dev);
  	struct sockaddr *addr = p;
  	unsigned int adr0, adr1;
  
  	if (!is_valid_ether_addr(addr->sa_data))
  		return -EADDRNOTAVAIL;
  
  	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
  
  	adr0 = dev->dev_addr[2] << 24 |
  	       dev->dev_addr[3] << 16 |
  	       dev->dev_addr[4] << 8 |
  	       dev->dev_addr[5];
  	adr1 = read_mac_reg(mac, PAS_MAC_CFG_ADR1);
  	adr1 &= ~0xffff;
  	adr1 |= dev->dev_addr[0] << 8 | dev->dev_addr[1];
  
  	pasemi_mac_intf_disable(mac);
  	write_mac_reg(mac, PAS_MAC_CFG_ADR0, adr0);
  	write_mac_reg(mac, PAS_MAC_CFG_ADR1, adr1);
  	pasemi_mac_intf_enable(mac);
  
  	return 0;
  }
  
  static int get_skb_hdr(struct sk_buff *skb, void **iphdr,
  		       void **tcph, u64 *hdr_flags, void *data)
  {
  	u64 macrx = (u64) data;
  	unsigned int ip_len;
  	struct iphdr *iph;
  
  	/* IPv4 header checksum failed */
  	if ((macrx & XCT_MACRX_HTY_M) != XCT_MACRX_HTY_IPV4_OK)
  		return -1;
  
  	/* non tcp packet */
  	skb_reset_network_header(skb);
  	iph = ip_hdr(skb);
  	if (iph->protocol != IPPROTO_TCP)
  		return -1;
  
  	ip_len = ip_hdrlen(skb);
  	skb_set_transport_header(skb, ip_len);
  	*tcph = tcp_hdr(skb);
  
  	/* check if ip header and tcp header are complete */
  	if (ntohs(iph->tot_len) < ip_len + tcp_hdrlen(skb))
  		return -1;
  
  	*hdr_flags = LRO_IPV4 | LRO_TCP;
  	*iphdr = iph;
  
  	return 0;
  }
  
  static int pasemi_mac_unmap_tx_skb(struct pasemi_mac *mac,
  				    const int nfrags,
  				    struct sk_buff *skb,
  				    const dma_addr_t *dmas)
  {
  	int f;
  	struct pci_dev *pdev = mac->dma_pdev;
  
  	pci_unmap_single(pdev, dmas[0], skb_headlen(skb), PCI_DMA_TODEVICE);
  
  	for (f = 0; f < nfrags; f++) {
  		const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
  
  		pci_unmap_page(pdev, dmas[f+1], skb_frag_size(frag), 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 struct pasemi_mac_csring *pasemi_mac_setup_csring(struct pasemi_mac *mac)
  {
  	struct pasemi_mac_csring *ring;
  	u32 val;
  	unsigned int cfg;
  	int chno;
  
  	ring = pasemi_dma_alloc_chan(TXCHAN, sizeof(struct pasemi_mac_csring),
  				       offsetof(struct pasemi_mac_csring, chan));
  
  	if (!ring) {
  		dev_err(&mac->pdev->dev, "Can't allocate checksum channel\n");
  		goto out_chan;
  	}
  
  	chno = ring->chan.chno;
  
  	ring->size = CS_RING_SIZE;
  	ring->next_to_fill = 0;
  
  	/* Allocate descriptors */
  	if (pasemi_dma_alloc_ring(&ring->chan, CS_RING_SIZE))
  		goto out_ring_desc;
  
  	write_dma_reg(PAS_DMA_TXCHAN_BASEL(chno),
  		      PAS_DMA_TXCHAN_BASEL_BRBL(ring->chan.ring_dma));
  	val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32);
  	val |= PAS_DMA_TXCHAN_BASEU_SIZ(CS_RING_SIZE >> 3);
  
  	write_dma_reg(PAS_DMA_TXCHAN_BASEU(chno), val);
  
  	ring->events[0] = pasemi_dma_alloc_flag();
  	ring->events[1] = pasemi_dma_alloc_flag();
  	if (ring->events[0] < 0 || ring->events[1] < 0)
  		goto out_flags;
  
  	pasemi_dma_clear_flag(ring->events[0]);
  	pasemi_dma_clear_flag(ring->events[1]);
  
  	ring->fun = pasemi_dma_alloc_fun();
  	if (ring->fun < 0)
  		goto out_fun;
  
  	cfg = PAS_DMA_TXCHAN_CFG_TY_FUNC | PAS_DMA_TXCHAN_CFG_UP |
  	      PAS_DMA_TXCHAN_CFG_TATTR(ring->fun) |
  	      PAS_DMA_TXCHAN_CFG_LPSQ | PAS_DMA_TXCHAN_CFG_LPDQ;
  
  	if (translation_enabled())
  		cfg |= PAS_DMA_TXCHAN_CFG_TRD | PAS_DMA_TXCHAN_CFG_TRR;
  
  	write_dma_reg(PAS_DMA_TXCHAN_CFG(chno), cfg);
  
  	/* enable channel */
  	pasemi_dma_start_chan(&ring->chan, PAS_DMA_TXCHAN_TCMDSTA_SZ |
  					   PAS_DMA_TXCHAN_TCMDSTA_DB |
  					   PAS_DMA_TXCHAN_TCMDSTA_DE |
  					   PAS_DMA_TXCHAN_TCMDSTA_DA);
  
  	return ring;
  
  out_fun:
  out_flags:
  	if (ring->events[0] >= 0)
  		pasemi_dma_free_flag(ring->events[0]);
  	if (ring->events[1] >= 0)
  		pasemi_dma_free_flag(ring->events[1]);
  	pasemi_dma_free_ring(&ring->chan);
  out_ring_desc:
  	pasemi_dma_free_chan(&ring->chan);
  out_chan:
  
  	return NULL;
  }
  
  static void pasemi_mac_setup_csrings(struct pasemi_mac *mac)
  {
  	int i;
  	mac->cs[0] = pasemi_mac_setup_csring(mac);
  	if (mac->type == MAC_TYPE_XAUI)
  		mac->cs[1] = pasemi_mac_setup_csring(mac);
  	else
  		mac->cs[1] = 0;
  
  	for (i = 0; i < MAX_CS; i++)
  		if (mac->cs[i])
  			mac->num_cs++;
  }
  
  static void pasemi_mac_free_csring(struct pasemi_mac_csring *csring)
  {
  	pasemi_dma_stop_chan(&csring->chan);
  	pasemi_dma_free_flag(csring->events[0]);
  	pasemi_dma_free_flag(csring->events[1]);
  	pasemi_dma_free_ring(&csring->chan);
  	pasemi_dma_free_chan(&csring->chan);
  	pasemi_dma_free_fun(csring->fun);
  }
  
  static int pasemi_mac_setup_rx_resources(const struct net_device *dev)
  {
  	struct pasemi_mac_rxring *ring;
  	struct pasemi_mac *mac = netdev_priv(dev);
  	int chno;
  	unsigned int cfg;
  
  	ring = pasemi_dma_alloc_chan(RXCHAN, sizeof(struct pasemi_mac_rxring),
  				     offsetof(struct pasemi_mac_rxring, chan));
  
  	if (!ring) {
  		dev_err(&mac->pdev->dev, "Can't allocate RX channel\n");
  		goto out_chan;
  	}
  	chno = ring->chan.chno;
  
  	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 */
  	if (pasemi_dma_alloc_ring(&ring->chan, RX_RING_SIZE))
  		goto out_ring_desc;
  
  	ring->buffers = dma_zalloc_coherent(&mac->dma_pdev->dev,
  					    RX_RING_SIZE * sizeof(u64),
  					    &ring->buf_dma, GFP_KERNEL);
  	if (!ring->buffers)
  		goto out_ring_desc;
  
  	write_dma_reg(PAS_DMA_RXCHAN_BASEL(chno),
  		      PAS_DMA_RXCHAN_BASEL_BRBL(ring->chan.ring_dma));
  
  	write_dma_reg(PAS_DMA_RXCHAN_BASEU(chno),
  		      PAS_DMA_RXCHAN_BASEU_BRBH(ring->chan.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(PAS_DMA_RXCHAN_CFG(chno), cfg);
  
  	write_dma_reg(PAS_DMA_RXINT_BASEL(mac->dma_if),
  		      PAS_DMA_RXINT_BASEL_BRBL(ring->buf_dma));
  
  	write_dma_reg(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(2) | 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(PAS_DMA_RXINT_CFG(mac->dma_if), cfg);
  
  	ring->next_to_fill = 0;
  	ring->next_to_clean = 0;
  	ring->mac = mac;
  	mac->rx = ring;
  
  	return 0;
  
  out_ring_desc:
  	kfree(ring->ring_info);
  out_ring_info:
  	pasemi_dma_free_chan(&ring->chan);
  out_chan:
  	return -ENOMEM;
  }
  
  static struct pasemi_mac_txring *
  pasemi_mac_setup_tx_resources(const struct net_device *dev)
  {
  	struct pasemi_mac *mac = netdev_priv(dev);
  	u32 val;
  	struct pasemi_mac_txring *ring;
  	unsigned int cfg;
  	int chno;
  
  	ring = pasemi_dma_alloc_chan(TXCHAN, sizeof(struct pasemi_mac_txring),
  				     offsetof(struct pasemi_mac_txring, chan));
  
  	if (!ring) {
  		dev_err(&mac->pdev->dev, "Can't allocate TX channel\n");
  		goto out_chan;
  	}
  
  	chno = ring->chan.chno;
  
  	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 */
  	if (pasemi_dma_alloc_ring(&ring->chan, TX_RING_SIZE))
  		goto out_ring_desc;
  
  	write_dma_reg(PAS_DMA_TXCHAN_BASEL(chno),
  		      PAS_DMA_TXCHAN_BASEL_BRBL(ring->chan.ring_dma));
  	val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32);
  	val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 3);
  
  	write_dma_reg(PAS_DMA_TXCHAN_BASEU(chno), 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(4);
  
  	if (translation_enabled())
  		cfg |= PAS_DMA_TXCHAN_CFG_TRD | PAS_DMA_TXCHAN_CFG_TRR;
  
  	write_dma_reg(PAS_DMA_TXCHAN_CFG(chno), cfg);
  
  	ring->next_to_fill = 0;
  	ring->next_to_clean = 0;
  	ring->mac = mac;
  
  	return ring;
  
  out_ring_desc:
  	kfree(ring->ring_info);
  out_ring_info:
  	pasemi_dma_free_chan(&ring->chan);
  out_chan:
  	return NULL;
  }
  
  static void pasemi_mac_free_tx_resources(struct pasemi_mac *mac)
  {
  	struct pasemi_mac_txring *txring = tx_ring(mac);
  	unsigned int i, j;
  	struct pasemi_mac_buffer *info;
  	dma_addr_t dmas[MAX_SKB_FRAGS+1];
  	int freed, nfrags;
  	int start, limit;
  
  	start = txring->next_to_clean;
  	limit = txring->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 = &txring->ring_info[(i+1) & (TX_RING_SIZE-1)];
  		if (info->dma && info->skb) {
  			nfrags = skb_shinfo(info->skb)->nr_frags;
  			for (j = 0; j <= nfrags; j++)
  				dmas[j] = txring->ring_info[(i+1+j) &
  						(TX_RING_SIZE-1)].dma;
  			freed = pasemi_mac_unmap_tx_skb(mac, nfrags,
  							info->skb, dmas);
  		} else {
  			freed = 2;
  		}
  	}
  
  	kfree(txring->ring_info);
  	pasemi_dma_free_chan(&txring->chan);
  
  }
  
  static void pasemi_mac_free_rx_buffers(struct pasemi_mac *mac)
  {
  	struct pasemi_mac_rxring *rx = rx_ring(mac);
  	unsigned int i;
  	struct pasemi_mac_buffer *info;
  
  	for (i = 0; i < RX_RING_SIZE; i++) {
  		info = &RX_DESC_INFO(rx, 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_BUFF(rx, i) = 0;
  }
  
  static void pasemi_mac_free_rx_resources(struct pasemi_mac *mac)
  {
  	pasemi_mac_free_rx_buffers(mac);
  
  	dma_free_coherent(&mac->dma_pdev->dev, RX_RING_SIZE * sizeof(u64),
  			  rx_ring(mac)->buffers, rx_ring(mac)->buf_dma);
  
  	kfree(rx_ring(mac)->ring_info);
  	pasemi_dma_free_chan(&rx_ring(mac)->chan);
  	mac->rx = NULL;
  }
  
  static void pasemi_mac_replenish_rx_ring(struct net_device *dev,
  					 const int limit)
  {
  	const struct pasemi_mac *mac = netdev_priv(dev);
  	struct pasemi_mac_rxring *rx = rx_ring(mac);
  	int fill, count;
  
  	if (limit <= 0)
  		return;
  
  	fill = rx_ring(mac)->next_to_fill;
  	for (count = 0; count < limit; count++) {
  		struct pasemi_mac_buffer *info = &RX_DESC_INFO(rx, fill);
  		u64 *buff = &RX_BUFF(rx, fill);
  		struct sk_buff *skb;
  		dma_addr_t dma;
  
  		/* Entry in use? */
  		WARN_ON(*buff);
  
  		skb = netdev_alloc_skb(dev, mac->bufsz);
  		skb_reserve(skb, LOCAL_SKB_ALIGN);
  
  		if (unlikely(!skb))
  			break;
  
  		dma = pci_map_single(mac->dma_pdev, skb->data,
  				     mac->bufsz - LOCAL_SKB_ALIGN,
  				     PCI_DMA_FROMDEVICE);
  
  		if (unlikely(pci_dma_mapping_error(mac->dma_pdev, dma))) {
  			dev_kfree_skb_irq(info->skb);
  			break;
  		}
  
  		info->skb = skb;
  		info->dma = dma;
  		*buff = XCT_RXB_LEN(mac->bufsz) | XCT_RXB_ADDR(dma);
  		fill++;
  	}
  
  	wmb();
  
  	write_dma_reg(PAS_DMA_RXINT_INCR(mac->dma_if), count);
  
  	rx_ring(mac)->next_to_fill = (rx_ring(mac)->next_to_fill + count) &
  				(RX_RING_SIZE - 1);
  }
  
  static void pasemi_mac_restart_rx_intr(const struct pasemi_mac *mac)
  {
  	struct pasemi_mac_rxring *rx = rx_ring(mac);
  	unsigned int reg, pcnt;
  	/* Re-enable packet count interrupts: finally
  	 * ack the packet count interrupt we got in rx_intr.
  	 */
  
  	pcnt = *rx->chan.status & PAS_STATUS_PCNT_M;
  
  	reg = PAS_IOB_DMA_RXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_RXCH_RESET_PINTC;
  
  	if (*rx->chan.status & PAS_STATUS_TIMER)
  		reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
  
  	write_iob_reg(PAS_IOB_DMA_RXCH_RESET(mac->rx->chan.chno), reg);
  }
  
  static void pasemi_mac_restart_tx_intr(const struct pasemi_mac *mac)
  {
  	unsigned int reg, pcnt;
  
  	/* Re-enable packet count interrupts */
  	pcnt = *tx_ring(mac)->chan.status & PAS_STATUS_PCNT_M;
  
  	reg = PAS_IOB_DMA_TXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_TXCH_RESET_PINTC;
  
  	write_iob_reg(PAS_IOB_DMA_TXCH_RESET(tx_ring(mac)->chan.chno), reg);
  }
  
  
  static inline void pasemi_mac_rx_error(const struct pasemi_mac *mac,
  				       const u64 macrx)
  {
  	unsigned int rcmdsta, ccmdsta;
  	struct pasemi_dmachan *chan = &rx_ring(mac)->chan;
  
  	if (!netif_msg_rx_err(mac))
  		return;
  
  	rcmdsta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
  	ccmdsta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(chan->chno));
  
  	printk(KERN_ERR "pasemi_mac: rx error. macrx %016llx, rx status %llx\n",
  		macrx, *chan->status);
  
  	printk(KERN_ERR "pasemi_mac: rcmdsta %08x ccmdsta %08x\n",
  		rcmdsta, ccmdsta);
  }
  
  static inline void pasemi_mac_tx_error(const struct pasemi_mac *mac,
  				       const u64 mactx)
  {
  	unsigned int cmdsta;
  	struct pasemi_dmachan *chan = &tx_ring(mac)->chan;
  
  	if (!netif_msg_tx_err(mac))
  		return;
  
  	cmdsta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(chan->chno));
  
  	printk(KERN_ERR "pasemi_mac: tx error. mactx 0x%016llx, "\
  		"tx status 0x%016llx\n", mactx, *chan->status);
  
  	printk(KERN_ERR "pasemi_mac: tcmdsta 0x%08x\n", cmdsta);
  }
  
  static int pasemi_mac_clean_rx(struct pasemi_mac_rxring *rx,
  			       const int limit)
  {
  	const struct pasemi_dmachan *chan = &rx->chan;
  	struct pasemi_mac *mac = rx->mac;
  	struct pci_dev *pdev = mac->dma_pdev;
  	unsigned int n;
  	int count, buf_index, tot_bytes, packets;
  	struct pasemi_mac_buffer *info;
  	struct sk_buff *skb;
  	unsigned int len;
  	u64 macrx, eval;
  	dma_addr_t dma;
  
  	tot_bytes = 0;
  	packets = 0;
  
  	spin_lock(&rx->lock);
  
  	n = rx->next_to_clean;
  
  	prefetch(&RX_DESC(rx, n));
  
  	for (count = 0; count < limit; count++) {
  		macrx = RX_DESC(rx, n);
  		prefetch(&RX_DESC(rx, n+4));
  
  		if ((macrx & XCT_MACRX_E) ||
  		    (*chan->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_DESC(rx, n+1) & XCT_RXRES_8B_EVAL_M) >>
  			XCT_RXRES_8B_EVAL_S;
  		buf_index = eval-1;
  
  		dma = (RX_DESC(rx, n+2) & XCT_PTR_ADDR_M);
  		info = &RX_DESC_INFO(rx, buf_index);
  
  		skb = info->skb;
  
  		prefetch_skb(skb);
  
  		len = (macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
  
  		pci_unmap_single(pdev, dma, mac->bufsz - LOCAL_SKB_ALIGN,
  				 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;
  		}
  
  		info->skb = NULL;
  		info->dma = 0;
  
  		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_checksum_none_assert(skb);
  		}
  
  		packets++;
  		tot_bytes += len;
  
  		/* Don't include CRC */
  		skb_put(skb, len-4);
  
  		skb->protocol = eth_type_trans(skb, mac->netdev);
  		lro_receive_skb(&mac->lro_mgr, skb, (void *)macrx);
  
  next:
  		RX_DESC(rx, n) = 0;
  		RX_DESC(rx, 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(rx, buf_index) = 0;
  
  		n += 4;
  	}
  
  	if (n > RX_RING_SIZE) {
  		/* Errata 5971 workaround: L2 target of headers */
  		write_iob_reg(PAS_IOB_COM_PKTHDRCNT, 0);
  		n &= (RX_RING_SIZE-1);
  	}
  
  	rx_ring(mac)->next_to_clean = n;
  
  	lro_flush_all(&mac->lro_mgr);
  
  	/* 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(PAS_DMA_RXCHAN_INCR(mac->rx->chan.chno), count << 1);
  
  	pasemi_mac_replenish_rx_ring(mac->netdev, count);
  
  	mac->netdev->stats.rx_bytes += tot_bytes;
  	mac->netdev->stats.rx_packets += packets;
  
  	spin_unlock(&rx_ring(mac)->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_txring *txring)
  {
  	struct pasemi_dmachan *chan = &txring->chan;
  	struct pasemi_mac *mac = txring->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];
  	int nf[TX_CLEAN_BATCHSIZE];
  	int nr_frags;
  
  	total_count = 0;
  	batch_limit = TX_CLEAN_BATCHSIZE;
  restart:
  	spin_lock_irqsave(&txring->lock, flags);
  
  	start = txring->next_to_clean;
  	ring_limit = txring->next_to_fill;
  
  	prefetch(&TX_DESC_INFO(txring, start+1).skb);
  
  	/* 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_DESC(txring, i);
  		struct sk_buff *skb;
  
  		if ((mactx  & XCT_MACTX_E) ||
  		    (*chan->status & PAS_STATUS_ERROR))
  			pasemi_mac_tx_error(mac, mactx);
  
  		/* Skip over control descriptors */
  		if (!(mactx & XCT_MACTX_LLEN_M)) {
  			TX_DESC(txring, i) = 0;
  			TX_DESC(txring, i+1) = 0;
  			buf_count = 2;
  			continue;
  		}
  
  		skb = TX_DESC_INFO(txring, i+1).skb;
  		nr_frags = TX_DESC_INFO(txring, i).dma;
  
  		if (unlikely(mactx & XCT_MACTX_O))
  			/* Not yet transmitted */
  			break;
  
  		buf_count = 2 + nr_frags;
  		/* 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++;
  
  		for (j = 0; j <= nr_frags; j++)
  			dmas[descr_count][j] = TX_DESC_INFO(txring, i+1+j).dma;
  
  		skbs[descr_count] = skb;
  		nf[descr_count] = nr_frags;
  
  		TX_DESC(txring, i) = 0;
  		TX_DESC(txring, i+1) = 0;
  
  		descr_count++;
  	}
  	txring->next_to_clean = i & (TX_RING_SIZE-1);
  
  	spin_unlock_irqrestore(&txring->lock, flags);
  	netif_wake_queue(mac->netdev);
  
  	for (i = 0; i < descr_count; i++)
  		pasemi_mac_unmap_tx_skb(mac, nf[i], 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)
  {
  	const struct pasemi_mac_rxring *rxring = data;
  	struct pasemi_mac *mac = rxring->mac;
  	const struct pasemi_dmachan *chan = &rxring->chan;
  	unsigned int reg;
  
  	if (!(*chan->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 (*chan->status & PAS_STATUS_SOFT)
  		reg |= PAS_IOB_DMA_RXCH_RESET_SINTC;
  	if (*chan->status & PAS_STATUS_ERROR)
  		reg |= PAS_IOB_DMA_RXCH_RESET_DINTC;
  
  	napi_schedule(&mac->napi);
  
  	write_iob_reg(PAS_IOB_DMA_RXCH_RESET(chan->chno), reg);
  
  	return IRQ_HANDLED;
  }
  
  #define TX_CLEAN_INTERVAL HZ
  
  static void pasemi_mac_tx_timer(unsigned long data)
  {
  	struct pasemi_mac_txring *txring = (struct pasemi_mac_txring *)data;
  	struct pasemi_mac *mac = txring->mac;
  
  	pasemi_mac_clean_tx(txring);
  
  	mod_timer(&txring->clean_timer, jiffies + TX_CLEAN_INTERVAL);
  
  	pasemi_mac_restart_tx_intr(mac);
  }
  
  static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
  {
  	struct pasemi_mac_txring *txring = data;
  	const struct pasemi_dmachan *chan = &txring->chan;
  	struct pasemi_mac *mac = txring->mac;
  	unsigned int reg;
  
  	if (!(*chan->status & PAS_STATUS_CAUSE_M))
  		return IRQ_NONE;
  
  	reg = 0;
  
  	if (*chan->status & PAS_STATUS_SOFT)
  		reg |= PAS_IOB_DMA_TXCH_RESET_SINTC;
  	if (*chan->status & PAS_STATUS_ERROR)
  		reg |= PAS_IOB_DMA_TXCH_RESET_DINTC;
  
  	mod_timer(&txring->clean_timer, jiffies + (TX_CLEAN_INTERVAL)*2);
  
  	napi_schedule(&mac->napi);
  
  	if (reg)
  		write_iob_reg(PAS_IOB_DMA_TXCH_RESET(chan->chno), 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);
  		pasemi_mac_intf_disable(mac);
  		mac->link = 0;
  
  		return;
  	} else {
  		pasemi_mac_intf_enable(mac);
  		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;
  
  	dn = pci_device_to_OF_node(mac->pdev);
  	phy_dn = of_parse_phandle(dn, "phy-handle", 0);
  	of_node_put(phy_dn);
  
  	mac->link = 0;
  	mac->speed = 0;
  	mac->duplex = -1;
  
  	phydev = of_phy_connect(dev, phy_dn, &pasemi_adjust_link, 0,
  				PHY_INTERFACE_MODE_SGMII);
  
  	if (!phydev) {
  		printk(KERN_ERR "%s: Could not attach to phy\n", dev->name);
  		return -ENODEV;
  	}
  
  	mac->phydev = phydev;
  
  	return 0;
  }
  
  
  static int pasemi_mac_open(struct net_device *dev)
  {
  	struct pasemi_mac *mac = netdev_priv(dev);
  	unsigned int flags;
  	int i, ret;
  
  	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);
  
  	ret = pasemi_mac_setup_rx_resources(dev);
  	if (ret)
  		goto out_rx_resources;
  
  	mac->tx = pasemi_mac_setup_tx_resources(dev);
  
  	if (!mac->tx)
  		goto out_tx_ring;
  
  	/* We might already have allocated rings in case mtu was changed
  	 * before interface was brought up.
  	 */
  	if (dev->mtu > 1500 && !mac->num_cs) {
  		pasemi_mac_setup_csrings(mac);
  		if (!mac->num_cs)
  			goto out_tx_ring;
  	}
  
  	/* Zero out rmon counters */
  	for (i = 0; i < 32; i++)
  		write_mac_reg(mac, PAS_MAC_RMON(i), 0);
  
  	/* 0x3ff with 33MHz clock is about 31us */
  	write_iob_reg(PAS_IOB_DMA_COM_TIMEOUTCFG,
  		      PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0x3ff));
  
  	write_iob_reg(PAS_IOB_DMA_RXCH_CFG(mac->rx->chan.chno),
  		      PAS_IOB_DMA_RXCH_CFG_CNTTH(256));
  
  	write_iob_reg(PAS_IOB_DMA_TXCH_CFG(mac->tx->chan.chno),
  		      PAS_IOB_DMA_TXCH_CFG_CNTTH(32));
  
  	write_mac_reg(mac, PAS_MAC_IPC_CHNL,
  		      PAS_MAC_IPC_CHNL_DCHNO(mac->rx->chan.chno) |
  		      PAS_MAC_IPC_CHNL_BCH(mac->rx->chan.chno));
  
  	/* enable rx if */
  	write_dma_reg(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 */
  	pasemi_dma_start_chan(&rx_ring(mac)->chan, PAS_DMA_RXCHAN_CCMDSTA_DU |
  						   PAS_DMA_RXCHAN_CCMDSTA_OD |
  						   PAS_DMA_RXCHAN_CCMDSTA_FD |
  						   PAS_DMA_RXCHAN_CCMDSTA_DT);
  
  	/* enable tx channel */
  	pasemi_dma_start_chan(&tx_ring(mac)->chan, 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(PAS_DMA_RXCHAN_INCR(rx_ring(mac)->chan.chno),
  		      RX_RING_SIZE>>1);
  
  	/* Clear out any residual packet count state from firmware */
  	pasemi_mac_restart_rx_intr(mac);
  	pasemi_mac_restart_tx_intr(mac);
  
  	flags = PAS_MAC_CFG_PCFG_S1 | 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);
  	if (ret) {
  		/* Since we won't get link notification, just enable RX */
  		pasemi_mac_intf_enable(mac);
  		if (mac->type == MAC_TYPE_GMAC) {
  			/* Warn for missing PHY on SGMII (1Gig) ports */
  			dev_warn(&mac->pdev->dev,
  				 "PHY init failed: %d.\n", ret);
  			dev_warn(&mac->pdev->dev,
  				 "Defaulting to 1Gbit full duplex\n");
  		}
  	}
  
  	netif_start_queue(dev);
  	napi_enable(&mac->napi);
  
  	snprintf(mac->tx_irq_name, sizeof(mac->tx_irq_name), "%s tx",
  		 dev->name);
  
  	ret = request_irq(mac->tx->chan.irq, pasemi_mac_tx_intr, 0,
  			  mac->tx_irq_name, mac->tx);
  	if (ret) {
  		dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
  			mac->tx->chan.irq, ret);
  		goto out_tx_int;
  	}
  
  	snprintf(mac->rx_irq_name, sizeof(mac->rx_irq_name), "%s rx",
  		 dev->name);
  
  	ret = request_irq(mac->rx->chan.irq, pasemi_mac_rx_intr, 0,
  			  mac->rx_irq_name, mac->rx);
  	if (ret) {
  		dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
  			mac->rx->chan.irq, ret);
  		goto out_rx_int;
  	}
  
  	if (mac->phydev)
  		phy_start(mac->phydev);
  
  	init_timer(&mac->tx->clean_timer);
  	mac->tx->clean_timer.function = pasemi_mac_tx_timer;
  	mac->tx->clean_timer.data = (unsigned long)mac->tx;
  	mac->tx->clean_timer.expires = jiffies+HZ;
  	add_timer(&mac->tx->clean_timer);
  
  	return 0;
  
  out_rx_int:
  	free_irq(mac->tx->chan.irq, mac->tx);
  out_tx_int:
  	napi_disable(&mac->napi);
  	netif_stop_queue(dev);
  out_tx_ring:
  	if (mac->tx)
  		pasemi_mac_free_tx_resources(mac);
  	pasemi_mac_free_rx_resources(mac);
  out_rx_resources:
  
  	return ret;
  }
  
  #define MAX_RETRIES 5000
  
  static void pasemi_mac_pause_txchan(struct pasemi_mac *mac)
  {
  	unsigned int sta, retries;
  	int txch = tx_ring(mac)->chan.chno;
  
  	write_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch),
  		      PAS_DMA_TXCHAN_TCMDSTA_ST);
  
  	for (retries = 0; retries < MAX_RETRIES; retries++) {
  		sta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(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, tcmdsta %08x\n", sta);
  
  	write_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch), 0);
  }
  
  static void pasemi_mac_pause_rxchan(struct pasemi_mac *mac)
  {
  	unsigned int sta, retries;
  	int rxch = rx_ring(mac)->chan.chno;
  
  	write_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch),
  		      PAS_DMA_RXCHAN_CCMDSTA_ST);
  	for (retries = 0; retries < MAX_RETRIES; retries++) {
  		sta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(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, ccmdsta 08%x\n", sta);
  	write_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch), 0);
  }
  
  static void pasemi_mac_pause_rxint(struct pasemi_mac *mac)
  {
  	unsigned int sta, retries;
  
  	write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
  		      PAS_DMA_RXINT_RCMDSTA_ST);
  	for (retries = 0; retries < MAX_RETRIES; retries++) {
  		sta = read_dma_reg(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, rcmdsta %08x\n", sta);
  	write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);
  }
  
  static int pasemi_mac_close(struct net_device *dev)
  {
  	struct pasemi_mac *mac = netdev_priv(dev);
  	unsigned int sta;
  	int rxch, txch, i;
  
  	rxch = rx_ring(mac)->chan.chno;
  	txch = tx_ring(mac)->chan.chno;
  
  	if (mac->phydev) {
  		phy_stop(mac->phydev);
  		phy_disconnect(mac->phydev);
  	}
  
  	del_timer_sync(&mac->tx->clean_timer);
  
  	netif_stop_queue(dev);
  	napi_disable(&mac->napi);
  
  	sta = read_dma_reg(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(PAS_DMA_RXCHAN_CCMDSTA(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(PAS_DMA_TXCHAN_TCMDSTA(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(tx_ring(mac));
  	pasemi_mac_clean_rx(rx_ring(mac), RX_RING_SIZE);
  
  	pasemi_mac_pause_txchan(mac);
  	pasemi_mac_pause_rxint(mac);
  	pasemi_mac_pause_rxchan(mac);
  	pasemi_mac_intf_disable(mac);
  
  	free_irq(mac->tx->chan.irq, mac->tx);
  	free_irq(mac->rx->chan.irq, mac->rx);
  
  	for (i = 0; i < mac->num_cs; i++) {
  		pasemi_mac_free_csring(mac->cs[i]);
  		mac->cs[i] = NULL;
  	}
  
  	mac->num_cs = 0;
  
  	/* Free resources */
  	pasemi_mac_free_rx_resources(mac);
  	pasemi_mac_free_tx_resources(mac);
  
  	return 0;
  }
  
  static void pasemi_mac_queue_csdesc(const struct sk_buff *skb,
  				    const dma_addr_t *map,
  				    const unsigned int *map_size,
  				    struct pasemi_mac_txring *txring,
  				    struct pasemi_mac_csring *csring)
  {
  	u64 fund;
  	dma_addr_t cs_dest;
  	const int nh_off = skb_network_offset(skb);
  	const int nh_len = skb_network_header_len(skb);
  	const int nfrags = skb_shinfo(skb)->nr_frags;
  	int cs_size, i, fill, hdr, cpyhdr, evt;
  	dma_addr_t csdma;
  
  	fund = XCT_FUN_ST | XCT_FUN_RR_8BRES |
  	       XCT_FUN_O | XCT_FUN_FUN(csring->fun) |
  	       XCT_FUN_CRM_SIG | XCT_FUN_LLEN(skb->len - nh_off) |
  	       XCT_FUN_SHL(nh_len >> 2) | XCT_FUN_SE;
  
  	switch (ip_hdr(skb)->protocol) {
  	case IPPROTO_TCP:
  		fund |= XCT_FUN_SIG_TCP4;
  		/* TCP checksum is 16 bytes into the header */
  		cs_dest = map[0] + skb_transport_offset(skb) + 16;
  		break;
  	case IPPROTO_UDP:
  		fund |= XCT_FUN_SIG_UDP4;
  		/* UDP checksum is 6 bytes into the header */
  		cs_dest = map[0] + skb_transport_offset(skb) + 6;
  		break;
  	default:
  		BUG();
  	}
  
  	/* Do the checksum offloaded */
  	fill = csring->next_to_fill;
  	hdr = fill;
  
  	CS_DESC(csring, fill++) = fund;
  	/* Room for 8BRES. Checksum result is really 2 bytes into it */
  	csdma = csring->chan.ring_dma + (fill & (CS_RING_SIZE-1)) * 8 + 2;
  	CS_DESC(csring, fill++) = 0;
  
  	CS_DESC(csring, fill) = XCT_PTR_LEN(map_size[0]-nh_off) | XCT_PTR_ADDR(map[0]+nh_off);
  	for (i = 1; i <= nfrags; i++)
  		CS_DESC(csring, fill+i) = XCT_PTR_LEN(map_size[i]) | XCT_PTR_ADDR(map[i]);
  
  	fill += i;
  	if (fill & 1)
  		fill++;
  
  	/* Copy the result into the TCP packet */
  	cpyhdr = fill;
  	CS_DESC(csring, fill++) = XCT_FUN_O | XCT_FUN_FUN(csring->fun) |
  				  XCT_FUN_LLEN(2) | XCT_FUN_SE;
  	CS_DESC(csring, fill++) = XCT_PTR_LEN(2) | XCT_PTR_ADDR(cs_dest) | XCT_PTR_T;
  	CS_DESC(csring, fill++) = XCT_PTR_LEN(2) | XCT_PTR_ADDR(csdma);
  	fill++;
  
  	evt = !csring->last_event;
  	csring->last_event = evt;
  
  	/* Event handshaking with MAC TX */
  	CS_DESC(csring, fill++) = CTRL_CMD_T | CTRL_CMD_META_EVT | CTRL_CMD_O |
  				  CTRL_CMD_ETYPE_SET | CTRL_CMD_REG(csring->events[evt]);
  	CS_DESC(csring, fill++) = 0;
  	CS_DESC(csring, fill++) = CTRL_CMD_T | CTRL_CMD_META_EVT | CTRL_CMD_O |
  				  CTRL_CMD_ETYPE_WCLR | CTRL_CMD_REG(csring->events[!evt]);
  	CS_DESC(csring, fill++) = 0;
  	csring->next_to_fill = fill & (CS_RING_SIZE-1);
  
  	cs_size = fill - hdr;
  	write_dma_reg(PAS_DMA_TXCHAN_INCR(csring->chan.chno), (cs_size) >> 1);
  
  	/* TX-side event handshaking */
  	fill = txring->next_to_fill;
  	TX_DESC(txring, fill++) = CTRL_CMD_T | CTRL_CMD_META_EVT | CTRL_CMD_O |
  				  CTRL_CMD_ETYPE_WSET | CTRL_CMD_REG(csring->events[evt]);
  	TX_DESC(txring, fill++) = 0;
  	TX_DESC(txring, fill++) = CTRL_CMD_T | CTRL_CMD_META_EVT | CTRL_CMD_O |
  				  CTRL_CMD_ETYPE_CLR | CTRL_CMD_REG(csring->events[!evt]);
  	TX_DESC(txring, fill++) = 0;
  	txring->next_to_fill = fill;
  
  	write_dma_reg(PAS_DMA_TXCHAN_INCR(txring->chan.chno), 2);
  }
  
  static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
  {
  	struct pasemi_mac * const mac = netdev_priv(dev);
  	struct pasemi_mac_txring * const txring = tx_ring(mac);
  	struct pasemi_mac_csring *csring;
  	u64 dflags = 0;
  	u64 mactx;
  	dma_addr_t map[MAX_SKB_FRAGS+1];
  	unsigned int map_size[MAX_SKB_FRAGS+1];
  	unsigned long flags;
  	int i, nfrags;
  	int fill;
  	const int nh_off = skb_network_offset(skb);
  	const int nh_len = skb_network_header_len(skb);
  
  	prefetch(&txring->ring_info);
  
  	dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_CRC_PAD;
  
  	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 (pci_dma_mapping_error(mac->dma_pdev, map[0]))
  		goto out_err_nolock;
  
  	for (i = 0; i < nfrags; i++) {
  		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
  
  		map[i + 1] = skb_frag_dma_map(&mac->dma_pdev->dev, frag, 0,
  					      skb_frag_size(frag), DMA_TO_DEVICE);
  		map_size[i+1] = skb_frag_size(frag);
  		if (dma_mapping_error(&mac->dma_pdev->dev, map[i + 1])) {
  			nfrags = i;
  			goto out_err_nolock;
  		}
  	}
  
  	if (skb->ip_summed == CHECKSUM_PARTIAL && skb->len <= 1540) {
  		switch (ip_hdr(skb)->protocol) {
  		case IPPROTO_TCP:
  			dflags |= XCT_MACTX_CSUM_TCP;
  			dflags |= XCT_MACTX_IPH(nh_len >> 2);
  			dflags |= XCT_MACTX_IPO(nh_off);
  			break;
  		case IPPROTO_UDP:
  			dflags |= XCT_MACTX_CSUM_UDP;
  			dflags |= XCT_MACTX_IPH(nh_len >> 2);
  			dflags |= XCT_MACTX_IPO(nh_off);
  			break;
  		default:
  			WARN_ON(1);
  		}
  	}
  
  	mactx = dflags | XCT_MACTX_LLEN(skb->len);
  
  	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 + 14) {
  		/* no room -- stop the queue and wait for tx intr */
  		netif_stop_queue(dev);
  		goto out_err;
  	}
  
  	/* Queue up checksum + event descriptors, if needed */
  	if (mac->num_cs && skb->ip_summed == CHECKSUM_PARTIAL && skb->len > 1540) {
  		csring = mac->cs[mac->last_cs];
  		mac->last_cs = (mac->last_cs + 1) % mac->num_cs;
  
  		pasemi_mac_queue_csdesc(skb, map, map_size, txring, csring);
  	}
  
  	fill = txring->next_to_fill;
  	TX_DESC(txring, fill) = mactx;
  	TX_DESC_INFO(txring, fill).dma = nfrags;
  	fill++;
  	TX_DESC_INFO(txring, fill).skb = skb;
  	for (i = 0; i <= nfrags; i++) {
  		TX_DESC(txring, fill+i) =
  			XCT_PTR_LEN(map_size[i]) | XCT_PTR_ADDR(map[i]);
  		TX_DESC_INFO(txring, 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 = (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(PAS_DMA_TXCHAN_INCR(txring->chan.chno), (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)
  {
  	const 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);
  	int pkts;
  
  	pasemi_mac_clean_tx(tx_ring(mac));
  	pkts = pasemi_mac_clean_rx(rx_ring(mac), budget);
  	if (pkts < budget) {
  		/* all done, no more packets present */
  		napi_complete(napi);
  
  		pasemi_mac_restart_rx_intr(mac);
  		pasemi_mac_restart_tx_intr(mac);
  	}
  	return pkts;
  }
  
  #ifdef CONFIG_NET_POLL_CONTROLLER
  /*
   * Polling 'interrupt' - used by things like netconsole to send skbs
   * without having to re-enable interrupts. It's not called while
   * the interrupt routine is executing.
   */
  static void pasemi_mac_netpoll(struct net_device *dev)
  {
  	const struct pasemi_mac *mac = netdev_priv(dev);
  
  	disable_irq(mac->tx->chan.irq);
  	pasemi_mac_tx_intr(mac->tx->chan.irq, mac->tx);
  	enable_irq(mac->tx->chan.irq);
  
  	disable_irq(mac->rx->chan.irq);
  	pasemi_mac_rx_intr(mac->rx->chan.irq, mac->rx);
  	enable_irq(mac->rx->chan.irq);
  }
  #endif
  
  static int pasemi_mac_change_mtu(struct net_device *dev, int new_mtu)
  {
  	struct pasemi_mac *mac = netdev_priv(dev);
  	unsigned int reg;
  	unsigned int rcmdsta = 0;
  	int running;
  	int ret = 0;
  
  	if (new_mtu < PE_MIN_MTU || new_mtu > PE_MAX_MTU)
  		return -EINVAL;
  
  	running = netif_running(dev);
  
  	if (running) {
  		/* Need to stop the interface, clean out all already
  		 * received buffers, free all unused buffers on the RX
  		 * interface ring, then finally re-fill the rx ring with
  		 * the new-size buffers and restart.
  		 */
  
  		napi_disable(&mac->napi);
  		netif_tx_disable(dev);
  		pasemi_mac_intf_disable(mac);
  
  		rcmdsta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
  		pasemi_mac_pause_rxint(mac);
  		pasemi_mac_clean_rx(rx_ring(mac), RX_RING_SIZE);
  		pasemi_mac_free_rx_buffers(mac);
  
  	}
  
  	/* Setup checksum channels if large MTU and none already allocated */
  	if (new_mtu > 1500 && !mac->num_cs) {
  		pasemi_mac_setup_csrings(mac);
  		if (!mac->num_cs) {
  			ret = -ENOMEM;
  			goto out;
  		}
  	}
  
  	/* Change maxf, i.e. what size frames are accepted.
  	 * Need room for ethernet header and CRC word
  	 */
  	reg = read_mac_reg(mac, PAS_MAC_CFG_MACCFG);
  	reg &= ~PAS_MAC_CFG_MACCFG_MAXF_M;
  	reg |= PAS_MAC_CFG_MACCFG_MAXF(new_mtu + ETH_HLEN + 4);
  	write_mac_reg(mac, PAS_MAC_CFG_MACCFG, reg);
  
  	dev->mtu = new_mtu;
  	/* MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */
  	mac->bufsz = new_mtu + ETH_HLEN + ETH_FCS_LEN + LOCAL_SKB_ALIGN + 128;
  
  out:
  	if (running) {
  		write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
  			      rcmdsta | PAS_DMA_RXINT_RCMDSTA_EN);
  
  		rx_ring(mac)->next_to_fill = 0;
  		pasemi_mac_replenish_rx_ring(dev, RX_RING_SIZE-1);
  
  		napi_enable(&mac->napi);
  		netif_start_queue(dev);
  		pasemi_mac_intf_enable(mac);
  	}
  
  	return ret;
  }
  
  static const struct net_device_ops pasemi_netdev_ops = {
  	.ndo_open		= pasemi_mac_open,
  	.ndo_stop		= pasemi_mac_close,
  	.ndo_start_xmit		= pasemi_mac_start_tx,
  	.ndo_set_rx_mode	= pasemi_mac_set_rx_mode,
  	.ndo_set_mac_address	= pasemi_mac_set_mac_addr,
  	.ndo_change_mtu		= pasemi_mac_change_mtu,
  	.ndo_validate_addr	= eth_validate_addr,
  #ifdef CONFIG_NET_POLL_CONTROLLER
  	.ndo_poll_controller	= pasemi_mac_netpoll,
  #endif
  };
  
  static int
  pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
  {
  	struct net_device *dev;
  	struct pasemi_mac *mac;
  	int err, ret;
  
  	err = pci_enable_device(pdev);
  	if (err)
  		return err;
  
  	dev = alloc_etherdev(sizeof(struct pasemi_mac));
  	if (dev == NULL) {
  		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 |
  			NETIF_F_HIGHDMA | NETIF_F_GSO;
  
  	mac->lro_mgr.max_aggr = LRO_MAX_AGGR;
  	mac->lro_mgr.max_desc = MAX_LRO_DESCRIPTORS;
  	mac->lro_mgr.lro_arr = mac->lro_desc;
  	mac->lro_mgr.get_skb_header = get_skb_hdr;
  	mac->lro_mgr.features = LRO_F_NAPI | LRO_F_EXTRACT_VLAN_ID;
  	mac->lro_mgr.dev = mac->netdev;
  	mac->lro_mgr.ip_summed = CHECKSUM_UNNECESSARY;
  	mac->lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
  
  
  	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");
  		err = -ENODEV;
  		goto out;
  	}
  
  	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");
  		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));
  
  	ret = mac_to_intf(mac);
  	if (ret < 0) {
  		dev_err(&mac->pdev->dev, "Can't map DMA interface\n");
  		err = -ENODEV;
  		goto out;
  	}
  	mac->dma_if = ret;
  
  	switch (pdev->device) {
  	case 0xa005:
  		mac->type = MAC_TYPE_GMAC;
  		break;
  	case 0xa006:
  		mac->type = MAC_TYPE_XAUI;
  		break;
  	default:
  		err = -ENODEV;
  		goto out;
  	}
  
  	dev->netdev_ops = &pasemi_netdev_ops;
  	dev->mtu = PE_DEF_MTU;
  	/* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */
  	mac->bufsz = dev->mtu + ETH_HLEN + ETH_FCS_LEN + LOCAL_SKB_ALIGN + 128;
  
  	dev->ethtool_ops = &pasemi_mac_ethtool_ops;
  
  	if (err)
  		goto out;
  
  	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, hw addr %pM\n",
  		       dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
  		       mac->dma_if, dev->dev_addr);
  	}
  
  	return err;
  
  out:
  	pci_dev_put(mac->iob_pdev);
  	pci_dev_put(mac->dma_pdev);
  
  	free_netdev(dev);
  out_disable_device:
  	pci_disable_device(pdev);
  	return err;
  
  }
  
  static void 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);
  
  	pasemi_dma_free_chan(&mac->tx->chan);
  	pasemi_dma_free_chan(&mac->rx->chan);
  
  	free_netdev(netdev);
  }
  
  static const 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		= pasemi_mac_remove,
  };
  
  static void __exit pasemi_mac_cleanup_module(void)
  {
  	pci_unregister_driver(&pasemi_mac_driver);
  }
  
  int pasemi_mac_init_module(void)
  {
  	int err;
  
  	err = pasemi_dma_init();
  	if (err)
  		return err;
  
  	return pci_register_driver(&pasemi_mac_driver);
  }
  
  module_init(pasemi_mac_init_module);
  module_exit(pasemi_mac_cleanup_module);
  