Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

5 files changed, 2203 insertions, 0 deletions

diff --git a/drivers/net/ethernet/pasemi/Kconfig b/drivers/net/ethernet/pasemi/Kconfig
new file mode 100644
index 000000000..cd68ebcf3
--- /dev/null
+++ b/drivers/net/ethernet/pasemi/Kconfig
@@ -0,0 +1,28 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# PA Semi network device configuration
+#
+
+config NET_VENDOR_PASEMI
+	bool "PA Semi devices"
+	default y
+	depends on PPC_PASEMI && PCI
+	help
+	  If you have a network (Ethernet) card belonging to this class, say Y.
+
+	  Note that the answer to this question doesn't directly affect the
+	  kernel: saying N will just cause the configurator to skip all
+	  the questions about PA Semi cards. If you say Y, you will be asked for
+	  your specific card in the following questions.
+
+if NET_VENDOR_PASEMI
+
+config PASEMI_MAC
+	tristate "PA Semi 1/10Gbit MAC"
+	depends on PPC_PASEMI && PCI
+	select PHYLIB
+	help
+	  This driver supports the on-chip 1/10Gbit Ethernet controller on
+	  PA Semi's PWRficient line of chips.
+
+endif # NET_VENDOR_PASEMI
diff --git a/drivers/net/ethernet/pasemi/Makefile b/drivers/net/ethernet/pasemi/Makefile
new file mode 100644
index 000000000..f51e614a2
--- /dev/null
+++ b/drivers/net/ethernet/pasemi/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the A Semi network device drivers.
+#
+
+obj-$(CONFIG_PASEMI_MAC) += pasemi_mac_driver.o
+pasemi_mac_driver-objs := pasemi_mac.o pasemi_mac_ethtool.o
diff --git a/drivers/net/ethernet/pasemi/pasemi_mac.c b/drivers/net/ethernet/pasemi/pasemi_mac.c
new file mode 100644
index 000000000..ed7dd0a04
--- /dev/null
+++ b/drivers/net/ethernet/pasemi/pasemi_mac.c
@@ -0,0 +1,1846 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2006-2007 PA Semi, Inc
+ *
+ * Driver for the PA Semi PWRficient onchip 1G/10G Ethernet MACs
+ */
+
+#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 <net/checksum.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
+ * - Multiqueue RX/TX
+ */
+
+#define PE_MIN_MTU	(ETH_ZLEN + ETH_HLEN)
+#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 (!mac_pton(maddr, addr)) {
+		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;
+
+	eth_hw_addr_set(dev, addr->sa_data);
+
+	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 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;
+
+	dma_unmap_single(&pdev->dev, dmas[0], skb_headlen(skb), DMA_TO_DEVICE);
+
+	for (f = 0; f < nfrags; f++) {
+		const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
+
+		dma_unmap_page(&pdev->dev, dmas[f + 1], skb_frag_size(frag),
+			       DMA_TO_DEVICE);
+	}
+	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 = kcalloc(RX_RING_SIZE,
+				  sizeof(struct pasemi_mac_buffer),
+				  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_alloc_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 = kcalloc(TX_RING_SIZE,
+				  sizeof(struct pasemi_mac_buffer),
+				  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) {
+			dma_unmap_single(&mac->dma_pdev->dev, info->dma,
+					 info->skb->len, DMA_FROM_DEVICE);
+			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 = dma_map_single(&mac->dma_pdev->dev, skb->data,
+				     mac->bufsz - LOCAL_SKB_ALIGN,
+				     DMA_FROM_DEVICE);
+
+		if (dma_mapping_error(&mac->dma_pdev->dev, 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;
+
+		dma_unmap_single(&pdev->dev, dma,
+				 mac->bufsz - LOCAL_SKB_ALIGN,
+				 DMA_FROM_DEVICE);
+
+		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);
+		napi_gro_receive(&mac->napi, skb);
+
+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;
+
+	/* 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(struct timer_list *t)
+{
+	struct pasemi_mac_txring *txring = from_timer(txring, t, clean_timer);
+	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 (!dev->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 (!dev->phydev->duplex)
+		new_flags |= PAS_MAC_CFG_PCFG_HD;
+
+	switch (dev->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", dev->phydev->speed);
+	}
+
+	/* Print on link or speed/duplex change */
+	msg = mac->link != dev->phydev->link || flags != new_flags;
+
+	mac->duplex = dev->phydev->duplex;
+	mac->speed = dev->phydev->speed;
+	mac->link = dev->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);
+
+	mac->link = 0;
+	mac->speed = 0;
+	mac->duplex = -1;
+
+	phydev = of_phy_connect(dev, phy_dn, &pasemi_adjust_link, 0,
+				PHY_INTERFACE_MODE_SGMII);
+
+	of_node_put(phy_dn);
+	if (!phydev) {
+		printk(KERN_ERR "%s: Could not attach to phy\n", dev->name);
+		return -ENODEV;
+	}
+
+	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) {
+		ret = -ENOMEM;
+		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) {
+			ret = -ENOMEM;
+			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 (dev->phydev)
+		phy_start(dev->phydev);
+
+	timer_setup(&mac->tx->clean_timer, pasemi_mac_tx_timer, 0);
+	mod_timer(&mac->tx->clean_timer, jiffies + HZ);
+
+	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 (dev->phydev) {
+		phy_stop(dev->phydev);
+		phy_disconnect(dev->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, 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 */
+	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 netdev_tx_t 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] = dma_map_single(&mac->dma_pdev->dev, skb->data,
+				skb_headlen(skb), DMA_TO_DEVICE);
+	map_size[0] = skb_headlen(skb);
+	if (dma_mapping_error(&mac->dma_pdev->dev, 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--)
+		dma_unmap_single(&mac->dma_pdev->dev, map[nfrags],
+				 map_size[nfrags], DMA_TO_DEVICE);
+
+	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_done(napi, pkts);
+
+		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;
+
+	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 > PE_DEF_MTU && !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);
+
+	dev->features = NETIF_F_IP_CSUM | NETIF_F_LLTX | NETIF_F_SG |
+			NETIF_F_HIGHDMA | NETIF_F_GSO;
+
+	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;
+	}
+	dma_set_mask(&mac->dma_pdev->dev, DMA_BIT_MASK(64));
+
+	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;
+	}
+	eth_hw_addr_set(dev, 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;
+
+	/* MTU range: 64 - 9000 */
+	dev->min_mtu = PE_MIN_MTU;
+	dev->max_mtu = PE_MAX_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);
+}
+
+static 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);
diff --git a/drivers/net/ethernet/pasemi/pasemi_mac.h b/drivers/net/ethernet/pasemi/pasemi_mac.h
new file mode 100644
index 000000000..d7d2068b6
--- /dev/null
+++ b/drivers/net/ethernet/pasemi/pasemi_mac.h
@@ -0,0 +1,199 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2006 PA Semi, Inc
+ *
+ * Driver for the PA6T-1682M onchip 1G/10G Ethernet MACs, soft state and
+ * hardware register layouts.
+ */
+
+#ifndef PASEMI_MAC_H
+#define PASEMI_MAC_H
+
+#include <linux/ethtool.h>
+#include <linux/netdevice.h>
+#include <linux/spinlock.h>
+#include <linux/phy.h>
+
+/* Must be a power of two */
+#define RX_RING_SIZE 2048
+#define TX_RING_SIZE 4096
+#define CS_RING_SIZE (TX_RING_SIZE*2)
+
+
+#define MAX_CS	2
+
+struct pasemi_mac_txring {
+	struct pasemi_dmachan chan; /* Must be first */
+	spinlock_t	 lock;
+	unsigned int	 size;
+	unsigned int	 next_to_fill;
+	unsigned int	 next_to_clean;
+	struct pasemi_mac_buffer *ring_info;
+	struct pasemi_mac *mac;	/* Needed in intr handler */
+	struct timer_list clean_timer;
+};
+
+struct pasemi_mac_rxring {
+	struct pasemi_dmachan chan; /* Must be first */
+	spinlock_t	 lock;
+	u64		*buffers;	/* RX interface buffer ring */
+	dma_addr_t	 buf_dma;
+	unsigned int	 size;
+	unsigned int	 next_to_fill;
+	unsigned int	 next_to_clean;
+	struct pasemi_mac_buffer *ring_info;
+	struct pasemi_mac *mac;	/* Needed in intr handler */
+};
+
+struct pasemi_mac_csring {
+	struct pasemi_dmachan chan;
+	unsigned int	size;
+	unsigned int	next_to_fill;
+	int		events[2];
+	int		last_event;
+	int		fun;
+};
+
+struct pasemi_mac {
+	struct net_device *netdev;
+	struct pci_dev *pdev;
+	struct pci_dev *dma_pdev;
+	struct pci_dev *iob_pdev;
+	struct napi_struct napi;
+
+	int		bufsz; /* RX ring buffer size */
+	int		last_cs;
+	int		num_cs;
+	u32		dma_if;
+	u8		type;
+#define MAC_TYPE_GMAC	1
+#define MAC_TYPE_XAUI	2
+
+	u8		mac_addr[ETH_ALEN];
+
+	struct timer_list	rxtimer;
+
+	struct pasemi_mac_txring *tx;
+	struct pasemi_mac_rxring *rx;
+	struct pasemi_mac_csring *cs[MAX_CS];
+	char		tx_irq_name[10];		/* "eth%d tx" */
+	char		rx_irq_name[10];		/* "eth%d rx" */
+	int	link;
+	int	speed;
+	int	duplex;
+
+	unsigned int	msg_enable;
+};
+
+/* Software status descriptor (ring_info) */
+struct pasemi_mac_buffer {
+	struct sk_buff *skb;
+	dma_addr_t	dma;
+};
+
+#define TX_DESC(tx, num)	((tx)->chan.ring_virt[(num) & (TX_RING_SIZE-1)])
+#define TX_DESC_INFO(tx, num)	((tx)->ring_info[(num) & (TX_RING_SIZE-1)])
+#define RX_DESC(rx, num)	((rx)->chan.ring_virt[(num) & (RX_RING_SIZE-1)])
+#define RX_DESC_INFO(rx, num)	((rx)->ring_info[(num) & (RX_RING_SIZE-1)])
+#define RX_BUFF(rx, num)	((rx)->buffers[(num) & (RX_RING_SIZE-1)])
+#define CS_DESC(cs, num)	((cs)->chan.ring_virt[(num) & (CS_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))
+
+/* PCI register offsets and formats */
+
+
+/* MAC CFG register offsets */
+enum {
+	PAS_MAC_CFG_PCFG = 0x80,
+	PAS_MAC_CFG_MACCFG = 0x84,
+	PAS_MAC_CFG_ADR0 = 0x8c,
+	PAS_MAC_CFG_ADR1 = 0x90,
+	PAS_MAC_CFG_TXP = 0x98,
+	PAS_MAC_CFG_RMON = 0x100,
+	PAS_MAC_IPC_CHNL = 0x208,
+};
+
+/* MAC CFG register fields */
+#define PAS_MAC_CFG_PCFG_PE		0x80000000
+#define PAS_MAC_CFG_PCFG_CE		0x40000000
+#define PAS_MAC_CFG_PCFG_BU		0x20000000
+#define PAS_MAC_CFG_PCFG_TT		0x10000000
+#define PAS_MAC_CFG_PCFG_TSR_M		0x0c000000
+#define PAS_MAC_CFG_PCFG_TSR_10M	0x00000000
+#define PAS_MAC_CFG_PCFG_TSR_100M	0x04000000
+#define PAS_MAC_CFG_PCFG_TSR_1G		0x08000000
+#define PAS_MAC_CFG_PCFG_TSR_10G	0x0c000000
+#define PAS_MAC_CFG_PCFG_T24		0x02000000
+#define PAS_MAC_CFG_PCFG_PR		0x01000000
+#define PAS_MAC_CFG_PCFG_CRO_M		0x00ff0000
+#define PAS_MAC_CFG_PCFG_CRO_S	16
+#define PAS_MAC_CFG_PCFG_IPO_M		0x0000ff00
+#define PAS_MAC_CFG_PCFG_IPO_S	8
+#define PAS_MAC_CFG_PCFG_S1		0x00000080
+#define PAS_MAC_CFG_PCFG_IO_M		0x00000060
+#define PAS_MAC_CFG_PCFG_IO_MAC		0x00000000
+#define PAS_MAC_CFG_PCFG_IO_OFF		0x00000020
+#define PAS_MAC_CFG_PCFG_IO_IND_ETH	0x00000040
+#define PAS_MAC_CFG_PCFG_IO_IND_IP	0x00000060
+#define PAS_MAC_CFG_PCFG_LP		0x00000010
+#define PAS_MAC_CFG_PCFG_TS		0x00000008
+#define PAS_MAC_CFG_PCFG_HD		0x00000004
+#define PAS_MAC_CFG_PCFG_SPD_M		0x00000003
+#define PAS_MAC_CFG_PCFG_SPD_10M	0x00000000
+#define PAS_MAC_CFG_PCFG_SPD_100M	0x00000001
+#define PAS_MAC_CFG_PCFG_SPD_1G		0x00000002
+#define PAS_MAC_CFG_PCFG_SPD_10G	0x00000003
+
+#define PAS_MAC_CFG_MACCFG_TXT_M	0x70000000
+#define PAS_MAC_CFG_MACCFG_TXT_S	28
+#define PAS_MAC_CFG_MACCFG_PRES_M	0x0f000000
+#define PAS_MAC_CFG_MACCFG_PRES_S	24
+#define PAS_MAC_CFG_MACCFG_MAXF_M	0x00ffff00
+#define PAS_MAC_CFG_MACCFG_MAXF_S	8
+#define PAS_MAC_CFG_MACCFG_MAXF(x)	(((x) << PAS_MAC_CFG_MACCFG_MAXF_S) & \
+					 PAS_MAC_CFG_MACCFG_MAXF_M)
+#define PAS_MAC_CFG_MACCFG_MINF_M	0x000000ff
+#define PAS_MAC_CFG_MACCFG_MINF_S	0
+
+#define PAS_MAC_CFG_TXP_FCF		0x01000000
+#define PAS_MAC_CFG_TXP_FCE		0x00800000
+#define PAS_MAC_CFG_TXP_FC		0x00400000
+#define PAS_MAC_CFG_TXP_FPC_M		0x00300000
+#define PAS_MAC_CFG_TXP_FPC_S		20
+#define PAS_MAC_CFG_TXP_FPC(x)		(((x) << PAS_MAC_CFG_TXP_FPC_S) & \
+					 PAS_MAC_CFG_TXP_FPC_M)
+#define PAS_MAC_CFG_TXP_RT		0x00080000
+#define PAS_MAC_CFG_TXP_BL		0x00040000
+#define PAS_MAC_CFG_TXP_SL_M		0x00030000
+#define PAS_MAC_CFG_TXP_SL_S		16
+#define PAS_MAC_CFG_TXP_SL(x)		(((x) << PAS_MAC_CFG_TXP_SL_S) & \
+					 PAS_MAC_CFG_TXP_SL_M)
+#define PAS_MAC_CFG_TXP_COB_M		0x0000f000
+#define PAS_MAC_CFG_TXP_COB_S		12
+#define PAS_MAC_CFG_TXP_COB(x)		(((x) << PAS_MAC_CFG_TXP_COB_S) & \
+					 PAS_MAC_CFG_TXP_COB_M)
+#define PAS_MAC_CFG_TXP_TIFT_M		0x00000f00
+#define PAS_MAC_CFG_TXP_TIFT_S		8
+#define PAS_MAC_CFG_TXP_TIFT(x)		(((x) << PAS_MAC_CFG_TXP_TIFT_S) & \
+					 PAS_MAC_CFG_TXP_TIFT_M)
+#define PAS_MAC_CFG_TXP_TIFG_M		0x000000ff
+#define PAS_MAC_CFG_TXP_TIFG_S		0
+#define PAS_MAC_CFG_TXP_TIFG(x)		(((x) << PAS_MAC_CFG_TXP_TIFG_S) & \
+					 PAS_MAC_CFG_TXP_TIFG_M)
+
+#define PAS_MAC_RMON(r)			(0x100+(r)*4)
+
+#define PAS_MAC_IPC_CHNL_DCHNO_M	0x003f0000
+#define PAS_MAC_IPC_CHNL_DCHNO_S	16
+#define PAS_MAC_IPC_CHNL_DCHNO(x)	(((x) << PAS_MAC_IPC_CHNL_DCHNO_S) & \
+					 PAS_MAC_IPC_CHNL_DCHNO_M)
+#define PAS_MAC_IPC_CHNL_BCH_M		0x0000003f
+#define PAS_MAC_IPC_CHNL_BCH_S		0
+#define PAS_MAC_IPC_CHNL_BCH(x)		(((x) << PAS_MAC_IPC_CHNL_BCH_S) & \
+					 PAS_MAC_IPC_CHNL_BCH_M)
+
+
+#endif /* PASEMI_MAC_H */
diff --git a/drivers/net/ethernet/pasemi/pasemi_mac_ethtool.c b/drivers/net/ethernet/pasemi/pasemi_mac_ethtool.c
new file mode 100644
index 000000000..4c7e0c991
--- /dev/null
+++ b/drivers/net/ethernet/pasemi/pasemi_mac_ethtool.c
@@ -0,0 +1,123 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2006-2008 PA Semi, Inc
+ *
+ * Ethtool hooks for the PA Semi PWRficient onchip 1G/10G Ethernet MACs
+ */
+
+
+#include <linux/netdevice.h>
+#include <linux/ethtool.h>
+#include <linux/pci.h>
+
+#include <asm/pasemi_dma.h>
+#include "pasemi_mac.h"
+
+static struct {
+	const char str[ETH_GSTRING_LEN];
+} ethtool_stats_keys[] = {
+	{ "rx-drops" },
+	{ "rx-bytes" },
+	{ "rx-packets" },
+	{ "rx-broadcast-packets" },
+	{ "rx-multicast-packets" },
+	{ "rx-crc-errors" },
+	{ "rx-undersize-errors" },
+	{ "rx-oversize-errors" },
+	{ "rx-short-fragment-errors" },
+	{ "rx-jabber-errors" },
+	{ "rx-64-byte-packets" },
+	{ "rx-65-127-byte-packets" },
+	{ "rx-128-255-byte-packets" },
+	{ "rx-256-511-byte-packets" },
+	{ "rx-512-1023-byte-packets" },
+	{ "rx-1024-1518-byte-packets" },
+	{ "rx-pause-frames" },
+	{ "tx-bytes" },
+	{ "tx-packets" },
+	{ "tx-broadcast-packets" },
+	{ "tx-multicast-packets" },
+	{ "tx-collisions" },
+	{ "tx-late-collisions" },
+	{ "tx-excessive-collisions" },
+	{ "tx-crc-errors" },
+	{ "tx-undersize-errors" },
+	{ "tx-oversize-errors" },
+	{ "tx-64-byte-packets" },
+	{ "tx-65-127-byte-packets" },
+	{ "tx-128-255-byte-packets" },
+	{ "tx-256-511-byte-packets" },
+	{ "tx-512-1023-byte-packets" },
+	{ "tx-1024-1518-byte-packets" },
+};
+
+static u32
+pasemi_mac_ethtool_get_msglevel(struct net_device *netdev)
+{
+	struct pasemi_mac *mac = netdev_priv(netdev);
+	return mac->msg_enable;
+}
+
+static void
+pasemi_mac_ethtool_set_msglevel(struct net_device *netdev,
+				u32 level)
+{
+	struct pasemi_mac *mac = netdev_priv(netdev);
+	mac->msg_enable = level;
+}
+
+
+static void
+pasemi_mac_ethtool_get_ringparam(struct net_device *netdev,
+				 struct ethtool_ringparam *ering,
+				 struct kernel_ethtool_ringparam *kernel_ering,
+				 struct netlink_ext_ack *extack)
+{
+	struct pasemi_mac *mac = netdev_priv(netdev);
+
+	ering->tx_max_pending = TX_RING_SIZE/2;
+	ering->tx_pending = RING_USED(mac->tx)/2;
+	ering->rx_max_pending = RX_RING_SIZE/4;
+	ering->rx_pending = RING_USED(mac->rx)/4;
+}
+
+static int pasemi_mac_get_sset_count(struct net_device *netdev, int sset)
+{
+	switch (sset) {
+	case ETH_SS_STATS:
+		return ARRAY_SIZE(ethtool_stats_keys);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static void pasemi_mac_get_ethtool_stats(struct net_device *netdev,
+		struct ethtool_stats *stats, u64 *data)
+{
+	struct pasemi_mac *mac = netdev_priv(netdev);
+	int i;
+
+	data[0] = pasemi_read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if))
+			>> PAS_DMA_RXINT_RCMDSTA_DROPS_S;
+	for (i = 0; i < 32; i++)
+		data[1+i] = pasemi_read_mac_reg(mac->dma_if, PAS_MAC_RMON(i));
+}
+
+static void pasemi_mac_get_strings(struct net_device *netdev, u32 stringset,
+				   u8 *data)
+{
+	memcpy(data, ethtool_stats_keys, sizeof(ethtool_stats_keys));
+}
+
+const struct ethtool_ops pasemi_mac_ethtool_ops = {
+	.get_msglevel		= pasemi_mac_ethtool_get_msglevel,
+	.set_msglevel		= pasemi_mac_ethtool_set_msglevel,
+	.get_link		= ethtool_op_get_link,
+	.get_ringparam          = pasemi_mac_ethtool_get_ringparam,
+	.get_strings		= pasemi_mac_get_strings,
+	.get_sset_count		= pasemi_mac_get_sset_count,
+	.get_ethtool_stats	= pasemi_mac_get_ethtool_stats,
+	.get_link_ksettings	= phy_ethtool_get_link_ksettings,
+	.set_link_ksettings	= phy_ethtool_set_link_ksettings,
+};
+