Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 3308 insertions, 0 deletions

diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c
new file mode 100644
index 000000000..8941f69d9
--- /dev/null
+++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
@@ -0,0 +1,3308 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for Marvell Discovery (MV643XX) and Marvell Orion ethernet ports
+ * Copyright (C) 2002 Matthew Dharm <mdharm@momenco.com>
+ *
+ * Based on the 64360 driver from:
+ * Copyright (C) 2002 Rabeeh Khoury <rabeeh@galileo.co.il>
+ *		      Rabeeh Khoury <rabeeh@marvell.com>
+ *
+ * Copyright (C) 2003 PMC-Sierra, Inc.,
+ *	written by Manish Lachwani
+ *
+ * Copyright (C) 2003 Ralf Baechle <ralf@linux-mips.org>
+ *
+ * Copyright (C) 2004-2006 MontaVista Software, Inc.
+ *			   Dale Farnsworth <dale@farnsworth.org>
+ *
+ * Copyright (C) 2004 Steven J. Hill <sjhill1@rockwellcollins.com>
+ *				     <sjhill@realitydiluted.com>
+ *
+ * Copyright (C) 2007-2008 Marvell Semiconductor
+ *			   Lennert Buytenhek <buytenh@marvell.com>
+ *
+ * Copyright (C) 2013 Michael Stapelberg <michael@stapelberg.de>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/dma-mapping.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <net/tso.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/etherdevice.h>
+#include <linux/delay.h>
+#include <linux/ethtool.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+#include <linux/phy.h>
+#include <linux/mv643xx_eth.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_net.h>
+#include <linux/of_mdio.h>
+
+static char mv643xx_eth_driver_name[] = "mv643xx_eth";
+static char mv643xx_eth_driver_version[] = "1.4";
+
+
+/*
+ * Registers shared between all ports.
+ */
+#define PHY_ADDR			0x0000
+#define WINDOW_BASE(w)			(0x0200 + ((w) << 3))
+#define WINDOW_SIZE(w)			(0x0204 + ((w) << 3))
+#define WINDOW_REMAP_HIGH(w)		(0x0280 + ((w) << 2))
+#define WINDOW_BAR_ENABLE		0x0290
+#define WINDOW_PROTECT(w)		(0x0294 + ((w) << 4))
+
+/*
+ * Main per-port registers.  These live at offset 0x0400 for
+ * port #0, 0x0800 for port #1, and 0x0c00 for port #2.
+ */
+#define PORT_CONFIG			0x0000
+#define  UNICAST_PROMISCUOUS_MODE	0x00000001
+#define PORT_CONFIG_EXT			0x0004
+#define MAC_ADDR_LOW			0x0014
+#define MAC_ADDR_HIGH			0x0018
+#define SDMA_CONFIG			0x001c
+#define  TX_BURST_SIZE_16_64BIT		0x01000000
+#define  TX_BURST_SIZE_4_64BIT		0x00800000
+#define  BLM_TX_NO_SWAP			0x00000020
+#define  BLM_RX_NO_SWAP			0x00000010
+#define  RX_BURST_SIZE_16_64BIT		0x00000008
+#define  RX_BURST_SIZE_4_64BIT		0x00000004
+#define PORT_SERIAL_CONTROL		0x003c
+#define  SET_MII_SPEED_TO_100		0x01000000
+#define  SET_GMII_SPEED_TO_1000		0x00800000
+#define  SET_FULL_DUPLEX_MODE		0x00200000
+#define  MAX_RX_PACKET_9700BYTE		0x000a0000
+#define  DISABLE_AUTO_NEG_SPEED_GMII	0x00002000
+#define  DO_NOT_FORCE_LINK_FAIL		0x00000400
+#define  SERIAL_PORT_CONTROL_RESERVED	0x00000200
+#define  DISABLE_AUTO_NEG_FOR_FLOW_CTRL	0x00000008
+#define  DISABLE_AUTO_NEG_FOR_DUPLEX	0x00000004
+#define  FORCE_LINK_PASS		0x00000002
+#define  SERIAL_PORT_ENABLE		0x00000001
+#define PORT_STATUS			0x0044
+#define  TX_FIFO_EMPTY			0x00000400
+#define  TX_IN_PROGRESS			0x00000080
+#define  PORT_SPEED_MASK		0x00000030
+#define  PORT_SPEED_1000		0x00000010
+#define  PORT_SPEED_100			0x00000020
+#define  PORT_SPEED_10			0x00000000
+#define  FLOW_CONTROL_ENABLED		0x00000008
+#define  FULL_DUPLEX			0x00000004
+#define  LINK_UP			0x00000002
+#define TXQ_COMMAND			0x0048
+#define TXQ_FIX_PRIO_CONF		0x004c
+#define PORT_SERIAL_CONTROL1		0x004c
+#define  CLK125_BYPASS_EN		0x00000010
+#define TX_BW_RATE			0x0050
+#define TX_BW_MTU			0x0058
+#define TX_BW_BURST			0x005c
+#define INT_CAUSE			0x0060
+#define  INT_TX_END			0x07f80000
+#define  INT_TX_END_0			0x00080000
+#define  INT_RX				0x000003fc
+#define  INT_RX_0			0x00000004
+#define  INT_EXT			0x00000002
+#define INT_CAUSE_EXT			0x0064
+#define  INT_EXT_LINK_PHY		0x00110000
+#define  INT_EXT_TX			0x000000ff
+#define INT_MASK			0x0068
+#define INT_MASK_EXT			0x006c
+#define TX_FIFO_URGENT_THRESHOLD	0x0074
+#define RX_DISCARD_FRAME_CNT		0x0084
+#define RX_OVERRUN_FRAME_CNT		0x0088
+#define TXQ_FIX_PRIO_CONF_MOVED		0x00dc
+#define TX_BW_RATE_MOVED		0x00e0
+#define TX_BW_MTU_MOVED			0x00e8
+#define TX_BW_BURST_MOVED		0x00ec
+#define RXQ_CURRENT_DESC_PTR(q)		(0x020c + ((q) << 4))
+#define RXQ_COMMAND			0x0280
+#define TXQ_CURRENT_DESC_PTR(q)		(0x02c0 + ((q) << 2))
+#define TXQ_BW_TOKENS(q)		(0x0300 + ((q) << 4))
+#define TXQ_BW_CONF(q)			(0x0304 + ((q) << 4))
+#define TXQ_BW_WRR_CONF(q)		(0x0308 + ((q) << 4))
+
+/*
+ * Misc per-port registers.
+ */
+#define MIB_COUNTERS(p)			(0x1000 + ((p) << 7))
+#define SPECIAL_MCAST_TABLE(p)		(0x1400 + ((p) << 10))
+#define OTHER_MCAST_TABLE(p)		(0x1500 + ((p) << 10))
+#define UNICAST_TABLE(p)		(0x1600 + ((p) << 10))
+
+
+/*
+ * SDMA configuration register default value.
+ */
+#if defined(__BIG_ENDIAN)
+#define PORT_SDMA_CONFIG_DEFAULT_VALUE		\
+		(RX_BURST_SIZE_4_64BIT	|	\
+		 TX_BURST_SIZE_4_64BIT)
+#elif defined(__LITTLE_ENDIAN)
+#define PORT_SDMA_CONFIG_DEFAULT_VALUE		\
+		(RX_BURST_SIZE_4_64BIT	|	\
+		 BLM_RX_NO_SWAP		|	\
+		 BLM_TX_NO_SWAP		|	\
+		 TX_BURST_SIZE_4_64BIT)
+#else
+#error One of __BIG_ENDIAN or __LITTLE_ENDIAN must be defined
+#endif
+
+
+/*
+ * Misc definitions.
+ */
+#define DEFAULT_RX_QUEUE_SIZE	128
+#define DEFAULT_TX_QUEUE_SIZE	512
+#define SKB_DMA_REALIGN		((PAGE_SIZE - NET_SKB_PAD) % SMP_CACHE_BYTES)
+
+/* Max number of allowed TCP segments for software TSO */
+#define MV643XX_MAX_TSO_SEGS 100
+#define MV643XX_MAX_SKB_DESCS (MV643XX_MAX_TSO_SEGS * 2 + MAX_SKB_FRAGS)
+
+#define IS_TSO_HEADER(txq, addr) \
+	((addr >= txq->tso_hdrs_dma) && \
+	 (addr < txq->tso_hdrs_dma + txq->tx_ring_size * TSO_HEADER_SIZE))
+
+#define DESC_DMA_MAP_SINGLE 0
+#define DESC_DMA_MAP_PAGE 1
+
+/*
+ * RX/TX descriptors.
+ */
+#if defined(__BIG_ENDIAN)
+struct rx_desc {
+	u16 byte_cnt;		/* Descriptor buffer byte count		*/
+	u16 buf_size;		/* Buffer size				*/
+	u32 cmd_sts;		/* Descriptor command status		*/
+	u32 next_desc_ptr;	/* Next descriptor pointer		*/
+	u32 buf_ptr;		/* Descriptor buffer pointer		*/
+};
+
+struct tx_desc {
+	u16 byte_cnt;		/* buffer byte count			*/
+	u16 l4i_chk;		/* CPU provided TCP checksum		*/
+	u32 cmd_sts;		/* Command/status field			*/
+	u32 next_desc_ptr;	/* Pointer to next descriptor		*/
+	u32 buf_ptr;		/* pointer to buffer for this descriptor*/
+};
+#elif defined(__LITTLE_ENDIAN)
+struct rx_desc {
+	u32 cmd_sts;		/* Descriptor command status		*/
+	u16 buf_size;		/* Buffer size				*/
+	u16 byte_cnt;		/* Descriptor buffer byte count		*/
+	u32 buf_ptr;		/* Descriptor buffer pointer		*/
+	u32 next_desc_ptr;	/* Next descriptor pointer		*/
+};
+
+struct tx_desc {
+	u32 cmd_sts;		/* Command/status field			*/
+	u16 l4i_chk;		/* CPU provided TCP checksum		*/
+	u16 byte_cnt;		/* buffer byte count			*/
+	u32 buf_ptr;		/* pointer to buffer for this descriptor*/
+	u32 next_desc_ptr;	/* Pointer to next descriptor		*/
+};
+#else
+#error One of __BIG_ENDIAN or __LITTLE_ENDIAN must be defined
+#endif
+
+/* RX & TX descriptor command */
+#define BUFFER_OWNED_BY_DMA		0x80000000
+
+/* RX & TX descriptor status */
+#define ERROR_SUMMARY			0x00000001
+
+/* RX descriptor status */
+#define LAYER_4_CHECKSUM_OK		0x40000000
+#define RX_ENABLE_INTERRUPT		0x20000000
+#define RX_FIRST_DESC			0x08000000
+#define RX_LAST_DESC			0x04000000
+#define RX_IP_HDR_OK			0x02000000
+#define RX_PKT_IS_IPV4			0x01000000
+#define RX_PKT_IS_ETHERNETV2		0x00800000
+#define RX_PKT_LAYER4_TYPE_MASK		0x00600000
+#define RX_PKT_LAYER4_TYPE_TCP_IPV4	0x00000000
+#define RX_PKT_IS_VLAN_TAGGED		0x00080000
+
+/* TX descriptor command */
+#define TX_ENABLE_INTERRUPT		0x00800000
+#define GEN_CRC				0x00400000
+#define TX_FIRST_DESC			0x00200000
+#define TX_LAST_DESC			0x00100000
+#define ZERO_PADDING			0x00080000
+#define GEN_IP_V4_CHECKSUM		0x00040000
+#define GEN_TCP_UDP_CHECKSUM		0x00020000
+#define UDP_FRAME			0x00010000
+#define MAC_HDR_EXTRA_4_BYTES		0x00008000
+#define GEN_TCP_UDP_CHK_FULL		0x00000400
+#define MAC_HDR_EXTRA_8_BYTES		0x00000200
+
+#define TX_IHL_SHIFT			11
+
+
+/* global *******************************************************************/
+struct mv643xx_eth_shared_private {
+	/*
+	 * Ethernet controller base address.
+	 */
+	void __iomem *base;
+
+	/*
+	 * Per-port MBUS window access register value.
+	 */
+	u32 win_protect;
+
+	/*
+	 * Hardware-specific parameters.
+	 */
+	int extended_rx_coal_limit;
+	int tx_bw_control;
+	int tx_csum_limit;
+	struct clk *clk;
+};
+
+#define TX_BW_CONTROL_ABSENT		0
+#define TX_BW_CONTROL_OLD_LAYOUT	1
+#define TX_BW_CONTROL_NEW_LAYOUT	2
+
+static int mv643xx_eth_open(struct net_device *dev);
+static int mv643xx_eth_stop(struct net_device *dev);
+
+
+/* per-port *****************************************************************/
+struct mib_counters {
+	u64 good_octets_received;
+	u32 bad_octets_received;
+	u32 internal_mac_transmit_err;
+	u32 good_frames_received;
+	u32 bad_frames_received;
+	u32 broadcast_frames_received;
+	u32 multicast_frames_received;
+	u32 frames_64_octets;
+	u32 frames_65_to_127_octets;
+	u32 frames_128_to_255_octets;
+	u32 frames_256_to_511_octets;
+	u32 frames_512_to_1023_octets;
+	u32 frames_1024_to_max_octets;
+	u64 good_octets_sent;
+	u32 good_frames_sent;
+	u32 excessive_collision;
+	u32 multicast_frames_sent;
+	u32 broadcast_frames_sent;
+	u32 unrec_mac_control_received;
+	u32 fc_sent;
+	u32 good_fc_received;
+	u32 bad_fc_received;
+	u32 undersize_received;
+	u32 fragments_received;
+	u32 oversize_received;
+	u32 jabber_received;
+	u32 mac_receive_error;
+	u32 bad_crc_event;
+	u32 collision;
+	u32 late_collision;
+	/* Non MIB hardware counters */
+	u32 rx_discard;
+	u32 rx_overrun;
+};
+
+struct rx_queue {
+	int index;
+
+	int rx_ring_size;
+
+	int rx_desc_count;
+	int rx_curr_desc;
+	int rx_used_desc;
+
+	struct rx_desc *rx_desc_area;
+	dma_addr_t rx_desc_dma;
+	int rx_desc_area_size;
+	struct sk_buff **rx_skb;
+};
+
+struct tx_queue {
+	int index;
+
+	int tx_ring_size;
+
+	int tx_desc_count;
+	int tx_curr_desc;
+	int tx_used_desc;
+
+	int tx_stop_threshold;
+	int tx_wake_threshold;
+
+	char *tso_hdrs;
+	dma_addr_t tso_hdrs_dma;
+
+	struct tx_desc *tx_desc_area;
+	char *tx_desc_mapping; /* array to track the type of the dma mapping */
+	dma_addr_t tx_desc_dma;
+	int tx_desc_area_size;
+
+	struct sk_buff_head tx_skb;
+
+	unsigned long tx_packets;
+	unsigned long tx_bytes;
+	unsigned long tx_dropped;
+};
+
+struct mv643xx_eth_private {
+	struct mv643xx_eth_shared_private *shared;
+	void __iomem *base;
+	int port_num;
+
+	struct net_device *dev;
+
+	struct timer_list mib_counters_timer;
+	spinlock_t mib_counters_lock;
+	struct mib_counters mib_counters;
+
+	struct work_struct tx_timeout_task;
+
+	struct napi_struct napi;
+	u32 int_mask;
+	u8 oom;
+	u8 work_link;
+	u8 work_tx;
+	u8 work_tx_end;
+	u8 work_rx;
+	u8 work_rx_refill;
+
+	int skb_size;
+
+	/*
+	 * RX state.
+	 */
+	int rx_ring_size;
+	unsigned long rx_desc_sram_addr;
+	int rx_desc_sram_size;
+	int rxq_count;
+	struct timer_list rx_oom;
+	struct rx_queue rxq[8];
+
+	/*
+	 * TX state.
+	 */
+	int tx_ring_size;
+	unsigned long tx_desc_sram_addr;
+	int tx_desc_sram_size;
+	int txq_count;
+	struct tx_queue txq[8];
+
+	/*
+	 * Hardware-specific parameters.
+	 */
+	struct clk *clk;
+	unsigned int t_clk;
+};
+
+
+/* port register accessors **************************************************/
+static inline u32 rdl(struct mv643xx_eth_private *mp, int offset)
+{
+	return readl(mp->shared->base + offset);
+}
+
+static inline u32 rdlp(struct mv643xx_eth_private *mp, int offset)
+{
+	return readl(mp->base + offset);
+}
+
+static inline void wrl(struct mv643xx_eth_private *mp, int offset, u32 data)
+{
+	writel(data, mp->shared->base + offset);
+}
+
+static inline void wrlp(struct mv643xx_eth_private *mp, int offset, u32 data)
+{
+	writel(data, mp->base + offset);
+}
+
+
+/* rxq/txq helper functions *************************************************/
+static struct mv643xx_eth_private *rxq_to_mp(struct rx_queue *rxq)
+{
+	return container_of(rxq, struct mv643xx_eth_private, rxq[rxq->index]);
+}
+
+static struct mv643xx_eth_private *txq_to_mp(struct tx_queue *txq)
+{
+	return container_of(txq, struct mv643xx_eth_private, txq[txq->index]);
+}
+
+static void rxq_enable(struct rx_queue *rxq)
+{
+	struct mv643xx_eth_private *mp = rxq_to_mp(rxq);
+	wrlp(mp, RXQ_COMMAND, 1 << rxq->index);
+}
+
+static void rxq_disable(struct rx_queue *rxq)
+{
+	struct mv643xx_eth_private *mp = rxq_to_mp(rxq);
+	u8 mask = 1 << rxq->index;
+
+	wrlp(mp, RXQ_COMMAND, mask << 8);
+	while (rdlp(mp, RXQ_COMMAND) & mask)
+		udelay(10);
+}
+
+static void txq_reset_hw_ptr(struct tx_queue *txq)
+{
+	struct mv643xx_eth_private *mp = txq_to_mp(txq);
+	u32 addr;
+
+	addr = (u32)txq->tx_desc_dma;
+	addr += txq->tx_curr_desc * sizeof(struct tx_desc);
+	wrlp(mp, TXQ_CURRENT_DESC_PTR(txq->index), addr);
+}
+
+static void txq_enable(struct tx_queue *txq)
+{
+	struct mv643xx_eth_private *mp = txq_to_mp(txq);
+	wrlp(mp, TXQ_COMMAND, 1 << txq->index);
+}
+
+static void txq_disable(struct tx_queue *txq)
+{
+	struct mv643xx_eth_private *mp = txq_to_mp(txq);
+	u8 mask = 1 << txq->index;
+
+	wrlp(mp, TXQ_COMMAND, mask << 8);
+	while (rdlp(mp, TXQ_COMMAND) & mask)
+		udelay(10);
+}
+
+static void txq_maybe_wake(struct tx_queue *txq)
+{
+	struct mv643xx_eth_private *mp = txq_to_mp(txq);
+	struct netdev_queue *nq = netdev_get_tx_queue(mp->dev, txq->index);
+
+	if (netif_tx_queue_stopped(nq)) {
+		__netif_tx_lock(nq, smp_processor_id());
+		if (txq->tx_desc_count <= txq->tx_wake_threshold)
+			netif_tx_wake_queue(nq);
+		__netif_tx_unlock(nq);
+	}
+}
+
+static int rxq_process(struct rx_queue *rxq, int budget)
+{
+	struct mv643xx_eth_private *mp = rxq_to_mp(rxq);
+	struct net_device_stats *stats = &mp->dev->stats;
+	int rx;
+
+	rx = 0;
+	while (rx < budget && rxq->rx_desc_count) {
+		struct rx_desc *rx_desc;
+		unsigned int cmd_sts;
+		struct sk_buff *skb;
+		u16 byte_cnt;
+
+		rx_desc = &rxq->rx_desc_area[rxq->rx_curr_desc];
+
+		cmd_sts = rx_desc->cmd_sts;
+		if (cmd_sts & BUFFER_OWNED_BY_DMA)
+			break;
+		rmb();
+
+		skb = rxq->rx_skb[rxq->rx_curr_desc];
+		rxq->rx_skb[rxq->rx_curr_desc] = NULL;
+
+		rxq->rx_curr_desc++;
+		if (rxq->rx_curr_desc == rxq->rx_ring_size)
+			rxq->rx_curr_desc = 0;
+
+		dma_unmap_single(mp->dev->dev.parent, rx_desc->buf_ptr,
+				 rx_desc->buf_size, DMA_FROM_DEVICE);
+		rxq->rx_desc_count--;
+		rx++;
+
+		mp->work_rx_refill |= 1 << rxq->index;
+
+		byte_cnt = rx_desc->byte_cnt;
+
+		/*
+		 * Update statistics.
+		 *
+		 * Note that the descriptor byte count includes 2 dummy
+		 * bytes automatically inserted by the hardware at the
+		 * start of the packet (which we don't count), and a 4
+		 * byte CRC at the end of the packet (which we do count).
+		 */
+		stats->rx_packets++;
+		stats->rx_bytes += byte_cnt - 2;
+
+		/*
+		 * In case we received a packet without first / last bits
+		 * on, or the error summary bit is set, the packet needs
+		 * to be dropped.
+		 */
+		if ((cmd_sts & (RX_FIRST_DESC | RX_LAST_DESC | ERROR_SUMMARY))
+			!= (RX_FIRST_DESC | RX_LAST_DESC))
+			goto err;
+
+		/*
+		 * The -4 is for the CRC in the trailer of the
+		 * received packet
+		 */
+		skb_put(skb, byte_cnt - 2 - 4);
+
+		if (cmd_sts & LAYER_4_CHECKSUM_OK)
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+		skb->protocol = eth_type_trans(skb, mp->dev);
+
+		napi_gro_receive(&mp->napi, skb);
+
+		continue;
+
+err:
+		stats->rx_dropped++;
+
+		if ((cmd_sts & (RX_FIRST_DESC | RX_LAST_DESC)) !=
+			(RX_FIRST_DESC | RX_LAST_DESC)) {
+			if (net_ratelimit())
+				netdev_err(mp->dev,
+					   "received packet spanning multiple descriptors\n");
+		}
+
+		if (cmd_sts & ERROR_SUMMARY)
+			stats->rx_errors++;
+
+		dev_kfree_skb(skb);
+	}
+
+	if (rx < budget)
+		mp->work_rx &= ~(1 << rxq->index);
+
+	return rx;
+}
+
+static int rxq_refill(struct rx_queue *rxq, int budget)
+{
+	struct mv643xx_eth_private *mp = rxq_to_mp(rxq);
+	int refilled;
+
+	refilled = 0;
+	while (refilled < budget && rxq->rx_desc_count < rxq->rx_ring_size) {
+		struct sk_buff *skb;
+		int rx;
+		struct rx_desc *rx_desc;
+		int size;
+
+		skb = netdev_alloc_skb(mp->dev, mp->skb_size);
+
+		if (skb == NULL) {
+			mp->oom = 1;
+			goto oom;
+		}
+
+		if (SKB_DMA_REALIGN)
+			skb_reserve(skb, SKB_DMA_REALIGN);
+
+		refilled++;
+		rxq->rx_desc_count++;
+
+		rx = rxq->rx_used_desc++;
+		if (rxq->rx_used_desc == rxq->rx_ring_size)
+			rxq->rx_used_desc = 0;
+
+		rx_desc = rxq->rx_desc_area + rx;
+
+		size = skb_end_pointer(skb) - skb->data;
+		rx_desc->buf_ptr = dma_map_single(mp->dev->dev.parent,
+						  skb->data, size,
+						  DMA_FROM_DEVICE);
+		rx_desc->buf_size = size;
+		rxq->rx_skb[rx] = skb;
+		wmb();
+		rx_desc->cmd_sts = BUFFER_OWNED_BY_DMA | RX_ENABLE_INTERRUPT;
+		wmb();
+
+		/*
+		 * The hardware automatically prepends 2 bytes of
+		 * dummy data to each received packet, so that the
+		 * IP header ends up 16-byte aligned.
+		 */
+		skb_reserve(skb, 2);
+	}
+
+	if (refilled < budget)
+		mp->work_rx_refill &= ~(1 << rxq->index);
+
+oom:
+	return refilled;
+}
+
+
+/* tx ***********************************************************************/
+static inline unsigned int has_tiny_unaligned_frags(struct sk_buff *skb)
+{
+	int frag;
+
+	for (frag = 0; frag < skb_shinfo(skb)->nr_frags; frag++) {
+		const skb_frag_t *fragp = &skb_shinfo(skb)->frags[frag];
+
+		if (skb_frag_size(fragp) <= 8 && skb_frag_off(fragp) & 7)
+			return 1;
+	}
+
+	return 0;
+}
+
+static int skb_tx_csum(struct mv643xx_eth_private *mp, struct sk_buff *skb,
+		       u16 *l4i_chk, u32 *command, int length)
+{
+	int ret;
+	u32 cmd = 0;
+
+	if (skb->ip_summed == CHECKSUM_PARTIAL) {
+		int hdr_len;
+		int tag_bytes;
+
+		BUG_ON(skb->protocol != htons(ETH_P_IP) &&
+		       skb->protocol != htons(ETH_P_8021Q));
+
+		hdr_len = (void *)ip_hdr(skb) - (void *)skb->data;
+		tag_bytes = hdr_len - ETH_HLEN;
+
+		if (length - hdr_len > mp->shared->tx_csum_limit ||
+		    unlikely(tag_bytes & ~12)) {
+			ret = skb_checksum_help(skb);
+			if (!ret)
+				goto no_csum;
+			return ret;
+		}
+
+		if (tag_bytes & 4)
+			cmd |= MAC_HDR_EXTRA_4_BYTES;
+		if (tag_bytes & 8)
+			cmd |= MAC_HDR_EXTRA_8_BYTES;
+
+		cmd |= GEN_TCP_UDP_CHECKSUM | GEN_TCP_UDP_CHK_FULL |
+			   GEN_IP_V4_CHECKSUM   |
+			   ip_hdr(skb)->ihl << TX_IHL_SHIFT;
+
+		/* TODO: Revisit this. With the usage of GEN_TCP_UDP_CHK_FULL
+		 * it seems we don't need to pass the initial checksum.
+		 */
+		switch (ip_hdr(skb)->protocol) {
+		case IPPROTO_UDP:
+			cmd |= UDP_FRAME;
+			*l4i_chk = 0;
+			break;
+		case IPPROTO_TCP:
+			*l4i_chk = 0;
+			break;
+		default:
+			WARN(1, "protocol not supported");
+		}
+	} else {
+no_csum:
+		/* Errata BTS #50, IHL must be 5 if no HW checksum */
+		cmd |= 5 << TX_IHL_SHIFT;
+	}
+	*command = cmd;
+	return 0;
+}
+
+static inline int
+txq_put_data_tso(struct net_device *dev, struct tx_queue *txq,
+		 struct sk_buff *skb, char *data, int length,
+		 bool last_tcp, bool is_last)
+{
+	int tx_index;
+	u32 cmd_sts;
+	struct tx_desc *desc;
+
+	tx_index = txq->tx_curr_desc++;
+	if (txq->tx_curr_desc == txq->tx_ring_size)
+		txq->tx_curr_desc = 0;
+	desc = &txq->tx_desc_area[tx_index];
+	txq->tx_desc_mapping[tx_index] = DESC_DMA_MAP_SINGLE;
+
+	desc->l4i_chk = 0;
+	desc->byte_cnt = length;
+
+	if (length <= 8 && (uintptr_t)data & 0x7) {
+		/* Copy unaligned small data fragment to TSO header data area */
+		memcpy(txq->tso_hdrs + tx_index * TSO_HEADER_SIZE,
+		       data, length);
+		desc->buf_ptr = txq->tso_hdrs_dma
+			+ tx_index * TSO_HEADER_SIZE;
+	} else {
+		/* Alignment is okay, map buffer and hand off to hardware */
+		txq->tx_desc_mapping[tx_index] = DESC_DMA_MAP_SINGLE;
+		desc->buf_ptr = dma_map_single(dev->dev.parent, data,
+			length, DMA_TO_DEVICE);
+		if (unlikely(dma_mapping_error(dev->dev.parent,
+					       desc->buf_ptr))) {
+			WARN(1, "dma_map_single failed!\n");
+			return -ENOMEM;
+		}
+	}
+
+	cmd_sts = BUFFER_OWNED_BY_DMA;
+	if (last_tcp) {
+		/* last descriptor in the TCP packet */
+		cmd_sts |= ZERO_PADDING | TX_LAST_DESC;
+		/* last descriptor in SKB */
+		if (is_last)
+			cmd_sts |= TX_ENABLE_INTERRUPT;
+	}
+	desc->cmd_sts = cmd_sts;
+	return 0;
+}
+
+static inline void
+txq_put_hdr_tso(struct sk_buff *skb, struct tx_queue *txq, int length,
+		u32 *first_cmd_sts, bool first_desc)
+{
+	struct mv643xx_eth_private *mp = txq_to_mp(txq);
+	int hdr_len = skb_tcp_all_headers(skb);
+	int tx_index;
+	struct tx_desc *desc;
+	int ret;
+	u32 cmd_csum = 0;
+	u16 l4i_chk = 0;
+	u32 cmd_sts;
+
+	tx_index = txq->tx_curr_desc;
+	desc = &txq->tx_desc_area[tx_index];
+
+	ret = skb_tx_csum(mp, skb, &l4i_chk, &cmd_csum, length);
+	if (ret)
+		WARN(1, "failed to prepare checksum!");
+
+	/* Should we set this? Can't use the value from skb_tx_csum()
+	 * as it's not the correct initial L4 checksum to use.
+	 */
+	desc->l4i_chk = 0;
+
+	desc->byte_cnt = hdr_len;
+	desc->buf_ptr = txq->tso_hdrs_dma +
+			txq->tx_curr_desc * TSO_HEADER_SIZE;
+	cmd_sts = cmd_csum | BUFFER_OWNED_BY_DMA  | TX_FIRST_DESC |
+				   GEN_CRC;
+
+	/* Defer updating the first command descriptor until all
+	 * following descriptors have been written.
+	 */
+	if (first_desc)
+		*first_cmd_sts = cmd_sts;
+	else
+		desc->cmd_sts = cmd_sts;
+
+	txq->tx_curr_desc++;
+	if (txq->tx_curr_desc == txq->tx_ring_size)
+		txq->tx_curr_desc = 0;
+}
+
+static int txq_submit_tso(struct tx_queue *txq, struct sk_buff *skb,
+			  struct net_device *dev)
+{
+	struct mv643xx_eth_private *mp = txq_to_mp(txq);
+	int hdr_len, total_len, data_left, ret;
+	int desc_count = 0;
+	struct tso_t tso;
+	struct tx_desc *first_tx_desc;
+	u32 first_cmd_sts = 0;
+
+	/* Count needed descriptors */
+	if ((txq->tx_desc_count + tso_count_descs(skb)) >= txq->tx_ring_size) {
+		netdev_dbg(dev, "not enough descriptors for TSO!\n");
+		return -EBUSY;
+	}
+
+	first_tx_desc = &txq->tx_desc_area[txq->tx_curr_desc];
+
+	/* Initialize the TSO handler, and prepare the first payload */
+	hdr_len = tso_start(skb, &tso);
+
+	total_len = skb->len - hdr_len;
+	while (total_len > 0) {
+		bool first_desc = (desc_count == 0);
+		char *hdr;
+
+		data_left = min_t(int, skb_shinfo(skb)->gso_size, total_len);
+		total_len -= data_left;
+		desc_count++;
+
+		/* prepare packet headers: MAC + IP + TCP */
+		hdr = txq->tso_hdrs + txq->tx_curr_desc * TSO_HEADER_SIZE;
+		tso_build_hdr(skb, hdr, &tso, data_left, total_len == 0);
+		txq_put_hdr_tso(skb, txq, data_left, &first_cmd_sts,
+				first_desc);
+
+		while (data_left > 0) {
+			int size;
+			desc_count++;
+
+			size = min_t(int, tso.size, data_left);
+			ret = txq_put_data_tso(dev, txq, skb, tso.data, size,
+					       size == data_left,
+					       total_len == 0);
+			if (ret)
+				goto err_release;
+			data_left -= size;
+			tso_build_data(skb, &tso, size);
+		}
+	}
+
+	__skb_queue_tail(&txq->tx_skb, skb);
+	skb_tx_timestamp(skb);
+
+	/* ensure all other descriptors are written before first cmd_sts */
+	wmb();
+	first_tx_desc->cmd_sts = first_cmd_sts;
+
+	/* clear TX_END status */
+	mp->work_tx_end &= ~(1 << txq->index);
+
+	/* ensure all descriptors are written before poking hardware */
+	wmb();
+	txq_enable(txq);
+	txq->tx_desc_count += desc_count;
+	return 0;
+err_release:
+	/* TODO: Release all used data descriptors; header descriptors must not
+	 * be DMA-unmapped.
+	 */
+	return ret;
+}
+
+static void txq_submit_frag_skb(struct tx_queue *txq, struct sk_buff *skb)
+{
+	struct mv643xx_eth_private *mp = txq_to_mp(txq);
+	int nr_frags = skb_shinfo(skb)->nr_frags;
+	int frag;
+
+	for (frag = 0; frag < nr_frags; frag++) {
+		skb_frag_t *this_frag;
+		int tx_index;
+		struct tx_desc *desc;
+
+		this_frag = &skb_shinfo(skb)->frags[frag];
+		tx_index = txq->tx_curr_desc++;
+		if (txq->tx_curr_desc == txq->tx_ring_size)
+			txq->tx_curr_desc = 0;
+		desc = &txq->tx_desc_area[tx_index];
+		txq->tx_desc_mapping[tx_index] = DESC_DMA_MAP_PAGE;
+
+		/*
+		 * The last fragment will generate an interrupt
+		 * which will free the skb on TX completion.
+		 */
+		if (frag == nr_frags - 1) {
+			desc->cmd_sts = BUFFER_OWNED_BY_DMA |
+					ZERO_PADDING | TX_LAST_DESC |
+					TX_ENABLE_INTERRUPT;
+		} else {
+			desc->cmd_sts = BUFFER_OWNED_BY_DMA;
+		}
+
+		desc->l4i_chk = 0;
+		desc->byte_cnt = skb_frag_size(this_frag);
+		desc->buf_ptr = skb_frag_dma_map(mp->dev->dev.parent,
+						 this_frag, 0, desc->byte_cnt,
+						 DMA_TO_DEVICE);
+	}
+}
+
+static int txq_submit_skb(struct tx_queue *txq, struct sk_buff *skb,
+			  struct net_device *dev)
+{
+	struct mv643xx_eth_private *mp = txq_to_mp(txq);
+	int nr_frags = skb_shinfo(skb)->nr_frags;
+	int tx_index;
+	struct tx_desc *desc;
+	u32 cmd_sts;
+	u16 l4i_chk;
+	int length, ret;
+
+	cmd_sts = 0;
+	l4i_chk = 0;
+
+	if (txq->tx_ring_size - txq->tx_desc_count < MAX_SKB_FRAGS + 1) {
+		if (net_ratelimit())
+			netdev_err(dev, "tx queue full?!\n");
+		return -EBUSY;
+	}
+
+	ret = skb_tx_csum(mp, skb, &l4i_chk, &cmd_sts, skb->len);
+	if (ret)
+		return ret;
+	cmd_sts |= TX_FIRST_DESC | GEN_CRC | BUFFER_OWNED_BY_DMA;
+
+	tx_index = txq->tx_curr_desc++;
+	if (txq->tx_curr_desc == txq->tx_ring_size)
+		txq->tx_curr_desc = 0;
+	desc = &txq->tx_desc_area[tx_index];
+	txq->tx_desc_mapping[tx_index] = DESC_DMA_MAP_SINGLE;
+
+	if (nr_frags) {
+		txq_submit_frag_skb(txq, skb);
+		length = skb_headlen(skb);
+	} else {
+		cmd_sts |= ZERO_PADDING | TX_LAST_DESC | TX_ENABLE_INTERRUPT;
+		length = skb->len;
+	}
+
+	desc->l4i_chk = l4i_chk;
+	desc->byte_cnt = length;
+	desc->buf_ptr = dma_map_single(mp->dev->dev.parent, skb->data,
+				       length, DMA_TO_DEVICE);
+
+	__skb_queue_tail(&txq->tx_skb, skb);
+
+	skb_tx_timestamp(skb);
+
+	/* ensure all other descriptors are written before first cmd_sts */
+	wmb();
+	desc->cmd_sts = cmd_sts;
+
+	/* clear TX_END status */
+	mp->work_tx_end &= ~(1 << txq->index);
+
+	/* ensure all descriptors are written before poking hardware */
+	wmb();
+	txq_enable(txq);
+
+	txq->tx_desc_count += nr_frags + 1;
+
+	return 0;
+}
+
+static netdev_tx_t mv643xx_eth_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct mv643xx_eth_private *mp = netdev_priv(dev);
+	int length, queue, ret;
+	struct tx_queue *txq;
+	struct netdev_queue *nq;
+
+	queue = skb_get_queue_mapping(skb);
+	txq = mp->txq + queue;
+	nq = netdev_get_tx_queue(dev, queue);
+
+	if (has_tiny_unaligned_frags(skb) && __skb_linearize(skb)) {
+		netdev_printk(KERN_DEBUG, dev,
+			      "failed to linearize skb with tiny unaligned fragment\n");
+		return NETDEV_TX_BUSY;
+	}
+
+	length = skb->len;
+
+	if (skb_is_gso(skb))
+		ret = txq_submit_tso(txq, skb, dev);
+	else
+		ret = txq_submit_skb(txq, skb, dev);
+	if (!ret) {
+		txq->tx_bytes += length;
+		txq->tx_packets++;
+
+		if (txq->tx_desc_count >= txq->tx_stop_threshold)
+			netif_tx_stop_queue(nq);
+	} else {
+		txq->tx_dropped++;
+		dev_kfree_skb_any(skb);
+	}
+
+	return NETDEV_TX_OK;
+}
+
+
+/* tx napi ******************************************************************/
+static void txq_kick(struct tx_queue *txq)
+{
+	struct mv643xx_eth_private *mp = txq_to_mp(txq);
+	struct netdev_queue *nq = netdev_get_tx_queue(mp->dev, txq->index);
+	u32 hw_desc_ptr;
+	u32 expected_ptr;
+
+	__netif_tx_lock(nq, smp_processor_id());
+
+	if (rdlp(mp, TXQ_COMMAND) & (1 << txq->index))
+		goto out;
+
+	hw_desc_ptr = rdlp(mp, TXQ_CURRENT_DESC_PTR(txq->index));
+	expected_ptr = (u32)txq->tx_desc_dma +
+				txq->tx_curr_desc * sizeof(struct tx_desc);
+
+	if (hw_desc_ptr != expected_ptr)
+		txq_enable(txq);
+
+out:
+	__netif_tx_unlock(nq);
+
+	mp->work_tx_end &= ~(1 << txq->index);
+}
+
+static int txq_reclaim(struct tx_queue *txq, int budget, int force)
+{
+	struct mv643xx_eth_private *mp = txq_to_mp(txq);
+	struct netdev_queue *nq = netdev_get_tx_queue(mp->dev, txq->index);
+	int reclaimed;
+
+	__netif_tx_lock_bh(nq);
+
+	reclaimed = 0;
+	while (reclaimed < budget && txq->tx_desc_count > 0) {
+		int tx_index;
+		struct tx_desc *desc;
+		u32 cmd_sts;
+		char desc_dma_map;
+
+		tx_index = txq->tx_used_desc;
+		desc = &txq->tx_desc_area[tx_index];
+		desc_dma_map = txq->tx_desc_mapping[tx_index];
+
+		cmd_sts = desc->cmd_sts;
+
+		if (cmd_sts & BUFFER_OWNED_BY_DMA) {
+			if (!force)
+				break;
+			desc->cmd_sts = cmd_sts & ~BUFFER_OWNED_BY_DMA;
+		}
+
+		txq->tx_used_desc = tx_index + 1;
+		if (txq->tx_used_desc == txq->tx_ring_size)
+			txq->tx_used_desc = 0;
+
+		reclaimed++;
+		txq->tx_desc_count--;
+
+		if (!IS_TSO_HEADER(txq, desc->buf_ptr)) {
+
+			if (desc_dma_map == DESC_DMA_MAP_PAGE)
+				dma_unmap_page(mp->dev->dev.parent,
+					       desc->buf_ptr,
+					       desc->byte_cnt,
+					       DMA_TO_DEVICE);
+			else
+				dma_unmap_single(mp->dev->dev.parent,
+						 desc->buf_ptr,
+						 desc->byte_cnt,
+						 DMA_TO_DEVICE);
+		}
+
+		if (cmd_sts & TX_ENABLE_INTERRUPT) {
+			struct sk_buff *skb = __skb_dequeue(&txq->tx_skb);
+
+			if (!WARN_ON(!skb))
+				dev_consume_skb_any(skb);
+		}
+
+		if (cmd_sts & ERROR_SUMMARY) {
+			netdev_info(mp->dev, "tx error\n");
+			mp->dev->stats.tx_errors++;
+		}
+
+	}
+
+	__netif_tx_unlock_bh(nq);
+
+	if (reclaimed < budget)
+		mp->work_tx &= ~(1 << txq->index);
+
+	return reclaimed;
+}
+
+
+/* tx rate control **********************************************************/
+/*
+ * Set total maximum TX rate (shared by all TX queues for this port)
+ * to 'rate' bits per second, with a maximum burst of 'burst' bytes.
+ */
+static void tx_set_rate(struct mv643xx_eth_private *mp, int rate, int burst)
+{
+	int token_rate;
+	int mtu;
+	int bucket_size;
+
+	token_rate = ((rate / 1000) * 64) / (mp->t_clk / 1000);
+	if (token_rate > 1023)
+		token_rate = 1023;
+
+	mtu = (mp->dev->mtu + 255) >> 8;
+	if (mtu > 63)
+		mtu = 63;
+
+	bucket_size = (burst + 255) >> 8;
+	if (bucket_size > 65535)
+		bucket_size = 65535;
+
+	switch (mp->shared->tx_bw_control) {
+	case TX_BW_CONTROL_OLD_LAYOUT:
+		wrlp(mp, TX_BW_RATE, token_rate);
+		wrlp(mp, TX_BW_MTU, mtu);
+		wrlp(mp, TX_BW_BURST, bucket_size);
+		break;
+	case TX_BW_CONTROL_NEW_LAYOUT:
+		wrlp(mp, TX_BW_RATE_MOVED, token_rate);
+		wrlp(mp, TX_BW_MTU_MOVED, mtu);
+		wrlp(mp, TX_BW_BURST_MOVED, bucket_size);
+		break;
+	}
+}
+
+static void txq_set_rate(struct tx_queue *txq, int rate, int burst)
+{
+	struct mv643xx_eth_private *mp = txq_to_mp(txq);
+	int token_rate;
+	int bucket_size;
+
+	token_rate = ((rate / 1000) * 64) / (mp->t_clk / 1000);
+	if (token_rate > 1023)
+		token_rate = 1023;
+
+	bucket_size = (burst + 255) >> 8;
+	if (bucket_size > 65535)
+		bucket_size = 65535;
+
+	wrlp(mp, TXQ_BW_TOKENS(txq->index), token_rate << 14);
+	wrlp(mp, TXQ_BW_CONF(txq->index), (bucket_size << 10) | token_rate);
+}
+
+static void txq_set_fixed_prio_mode(struct tx_queue *txq)
+{
+	struct mv643xx_eth_private *mp = txq_to_mp(txq);
+	int off;
+	u32 val;
+
+	/*
+	 * Turn on fixed priority mode.
+	 */
+	off = 0;
+	switch (mp->shared->tx_bw_control) {
+	case TX_BW_CONTROL_OLD_LAYOUT:
+		off = TXQ_FIX_PRIO_CONF;
+		break;
+	case TX_BW_CONTROL_NEW_LAYOUT:
+		off = TXQ_FIX_PRIO_CONF_MOVED;
+		break;
+	}
+
+	if (off) {
+		val = rdlp(mp, off);
+		val |= 1 << txq->index;
+		wrlp(mp, off, val);
+	}
+}
+
+
+/* mii management interface *************************************************/
+static void mv643xx_eth_adjust_link(struct net_device *dev)
+{
+	struct mv643xx_eth_private *mp = netdev_priv(dev);
+	u32 pscr = rdlp(mp, PORT_SERIAL_CONTROL);
+	u32 autoneg_disable = FORCE_LINK_PASS |
+	             DISABLE_AUTO_NEG_SPEED_GMII |
+		     DISABLE_AUTO_NEG_FOR_FLOW_CTRL |
+		     DISABLE_AUTO_NEG_FOR_DUPLEX;
+
+	if (dev->phydev->autoneg == AUTONEG_ENABLE) {
+		/* enable auto negotiation */
+		pscr &= ~autoneg_disable;
+		goto out_write;
+	}
+
+	pscr |= autoneg_disable;
+
+	if (dev->phydev->speed == SPEED_1000) {
+		/* force gigabit, half duplex not supported */
+		pscr |= SET_GMII_SPEED_TO_1000;
+		pscr |= SET_FULL_DUPLEX_MODE;
+		goto out_write;
+	}
+
+	pscr &= ~SET_GMII_SPEED_TO_1000;
+
+	if (dev->phydev->speed == SPEED_100)
+		pscr |= SET_MII_SPEED_TO_100;
+	else
+		pscr &= ~SET_MII_SPEED_TO_100;
+
+	if (dev->phydev->duplex == DUPLEX_FULL)
+		pscr |= SET_FULL_DUPLEX_MODE;
+	else
+		pscr &= ~SET_FULL_DUPLEX_MODE;
+
+out_write:
+	wrlp(mp, PORT_SERIAL_CONTROL, pscr);
+}
+
+/* statistics ***************************************************************/
+static struct net_device_stats *mv643xx_eth_get_stats(struct net_device *dev)
+{
+	struct mv643xx_eth_private *mp = netdev_priv(dev);
+	struct net_device_stats *stats = &dev->stats;
+	unsigned long tx_packets = 0;
+	unsigned long tx_bytes = 0;
+	unsigned long tx_dropped = 0;
+	int i;
+
+	for (i = 0; i < mp->txq_count; i++) {
+		struct tx_queue *txq = mp->txq + i;
+
+		tx_packets += txq->tx_packets;
+		tx_bytes += txq->tx_bytes;
+		tx_dropped += txq->tx_dropped;
+	}
+
+	stats->tx_packets = tx_packets;
+	stats->tx_bytes = tx_bytes;
+	stats->tx_dropped = tx_dropped;
+
+	return stats;
+}
+
+static inline u32 mib_read(struct mv643xx_eth_private *mp, int offset)
+{
+	return rdl(mp, MIB_COUNTERS(mp->port_num) + offset);
+}
+
+static void mib_counters_clear(struct mv643xx_eth_private *mp)
+{
+	int i;
+
+	for (i = 0; i < 0x80; i += 4)
+		mib_read(mp, i);
+
+	/* Clear non MIB hw counters also */
+	rdlp(mp, RX_DISCARD_FRAME_CNT);
+	rdlp(mp, RX_OVERRUN_FRAME_CNT);
+}
+
+static void mib_counters_update(struct mv643xx_eth_private *mp)
+{
+	struct mib_counters *p = &mp->mib_counters;
+
+	spin_lock_bh(&mp->mib_counters_lock);
+	p->good_octets_received += mib_read(mp, 0x00);
+	p->bad_octets_received += mib_read(mp, 0x08);
+	p->internal_mac_transmit_err += mib_read(mp, 0x0c);
+	p->good_frames_received += mib_read(mp, 0x10);
+	p->bad_frames_received += mib_read(mp, 0x14);
+	p->broadcast_frames_received += mib_read(mp, 0x18);
+	p->multicast_frames_received += mib_read(mp, 0x1c);
+	p->frames_64_octets += mib_read(mp, 0x20);
+	p->frames_65_to_127_octets += mib_read(mp, 0x24);
+	p->frames_128_to_255_octets += mib_read(mp, 0x28);
+	p->frames_256_to_511_octets += mib_read(mp, 0x2c);
+	p->frames_512_to_1023_octets += mib_read(mp, 0x30);
+	p->frames_1024_to_max_octets += mib_read(mp, 0x34);
+	p->good_octets_sent += mib_read(mp, 0x38);
+	p->good_frames_sent += mib_read(mp, 0x40);
+	p->excessive_collision += mib_read(mp, 0x44);
+	p->multicast_frames_sent += mib_read(mp, 0x48);
+	p->broadcast_frames_sent += mib_read(mp, 0x4c);
+	p->unrec_mac_control_received += mib_read(mp, 0x50);
+	p->fc_sent += mib_read(mp, 0x54);
+	p->good_fc_received += mib_read(mp, 0x58);
+	p->bad_fc_received += mib_read(mp, 0x5c);
+	p->undersize_received += mib_read(mp, 0x60);
+	p->fragments_received += mib_read(mp, 0x64);
+	p->oversize_received += mib_read(mp, 0x68);
+	p->jabber_received += mib_read(mp, 0x6c);
+	p->mac_receive_error += mib_read(mp, 0x70);
+	p->bad_crc_event += mib_read(mp, 0x74);
+	p->collision += mib_read(mp, 0x78);
+	p->late_collision += mib_read(mp, 0x7c);
+	/* Non MIB hardware counters */
+	p->rx_discard += rdlp(mp, RX_DISCARD_FRAME_CNT);
+	p->rx_overrun += rdlp(mp, RX_OVERRUN_FRAME_CNT);
+	spin_unlock_bh(&mp->mib_counters_lock);
+}
+
+static void mib_counters_timer_wrapper(struct timer_list *t)
+{
+	struct mv643xx_eth_private *mp = from_timer(mp, t, mib_counters_timer);
+	mib_counters_update(mp);
+	mod_timer(&mp->mib_counters_timer, jiffies + 30 * HZ);
+}
+
+
+/* interrupt coalescing *****************************************************/
+/*
+ * Hardware coalescing parameters are set in units of 64 t_clk
+ * cycles.  I.e.:
+ *
+ *	coal_delay_in_usec = 64000000 * register_value / t_clk_rate
+ *
+ *	register_value = coal_delay_in_usec * t_clk_rate / 64000000
+ *
+ * In the ->set*() methods, we round the computed register value
+ * to the nearest integer.
+ */
+static unsigned int get_rx_coal(struct mv643xx_eth_private *mp)
+{
+	u32 val = rdlp(mp, SDMA_CONFIG);
+	u64 temp;
+
+	if (mp->shared->extended_rx_coal_limit)
+		temp = ((val & 0x02000000) >> 10) | ((val & 0x003fff80) >> 7);
+	else
+		temp = (val & 0x003fff00) >> 8;
+
+	temp *= 64000000;
+	temp += mp->t_clk / 2;
+	do_div(temp, mp->t_clk);
+
+	return (unsigned int)temp;
+}
+
+static void set_rx_coal(struct mv643xx_eth_private *mp, unsigned int usec)
+{
+	u64 temp;
+	u32 val;
+
+	temp = (u64)usec * mp->t_clk;
+	temp += 31999999;
+	do_div(temp, 64000000);
+
+	val = rdlp(mp, SDMA_CONFIG);
+	if (mp->shared->extended_rx_coal_limit) {
+		if (temp > 0xffff)
+			temp = 0xffff;
+		val &= ~0x023fff80;
+		val |= (temp & 0x8000) << 10;
+		val |= (temp & 0x7fff) << 7;
+	} else {
+		if (temp > 0x3fff)
+			temp = 0x3fff;
+		val &= ~0x003fff00;
+		val |= (temp & 0x3fff) << 8;
+	}
+	wrlp(mp, SDMA_CONFIG, val);
+}
+
+static unsigned int get_tx_coal(struct mv643xx_eth_private *mp)
+{
+	u64 temp;
+
+	temp = (rdlp(mp, TX_FIFO_URGENT_THRESHOLD) & 0x3fff0) >> 4;
+	temp *= 64000000;
+	temp += mp->t_clk / 2;
+	do_div(temp, mp->t_clk);
+
+	return (unsigned int)temp;
+}
+
+static void set_tx_coal(struct mv643xx_eth_private *mp, unsigned int usec)
+{
+	u64 temp;
+
+	temp = (u64)usec * mp->t_clk;
+	temp += 31999999;
+	do_div(temp, 64000000);
+
+	if (temp > 0x3fff)
+		temp = 0x3fff;
+
+	wrlp(mp, TX_FIFO_URGENT_THRESHOLD, temp << 4);
+}
+
+
+/* ethtool ******************************************************************/
+struct mv643xx_eth_stats {
+	char stat_string[ETH_GSTRING_LEN];
+	int sizeof_stat;
+	int netdev_off;
+	int mp_off;
+};
+
+#define SSTAT(m)						\
+	{ #m, sizeof_field(struct net_device_stats, m),		\
+	  offsetof(struct net_device, stats.m), -1 }
+
+#define MIBSTAT(m)						\
+	{ #m, sizeof_field(struct mib_counters, m),		\
+	  -1, offsetof(struct mv643xx_eth_private, mib_counters.m) }
+
+static const struct mv643xx_eth_stats mv643xx_eth_stats[] = {
+	SSTAT(rx_packets),
+	SSTAT(tx_packets),
+	SSTAT(rx_bytes),
+	SSTAT(tx_bytes),
+	SSTAT(rx_errors),
+	SSTAT(tx_errors),
+	SSTAT(rx_dropped),
+	SSTAT(tx_dropped),
+	MIBSTAT(good_octets_received),
+	MIBSTAT(bad_octets_received),
+	MIBSTAT(internal_mac_transmit_err),
+	MIBSTAT(good_frames_received),
+	MIBSTAT(bad_frames_received),
+	MIBSTAT(broadcast_frames_received),
+	MIBSTAT(multicast_frames_received),
+	MIBSTAT(frames_64_octets),
+	MIBSTAT(frames_65_to_127_octets),
+	MIBSTAT(frames_128_to_255_octets),
+	MIBSTAT(frames_256_to_511_octets),
+	MIBSTAT(frames_512_to_1023_octets),
+	MIBSTAT(frames_1024_to_max_octets),
+	MIBSTAT(good_octets_sent),
+	MIBSTAT(good_frames_sent),
+	MIBSTAT(excessive_collision),
+	MIBSTAT(multicast_frames_sent),
+	MIBSTAT(broadcast_frames_sent),
+	MIBSTAT(unrec_mac_control_received),
+	MIBSTAT(fc_sent),
+	MIBSTAT(good_fc_received),
+	MIBSTAT(bad_fc_received),
+	MIBSTAT(undersize_received),
+	MIBSTAT(fragments_received),
+	MIBSTAT(oversize_received),
+	MIBSTAT(jabber_received),
+	MIBSTAT(mac_receive_error),
+	MIBSTAT(bad_crc_event),
+	MIBSTAT(collision),
+	MIBSTAT(late_collision),
+	MIBSTAT(rx_discard),
+	MIBSTAT(rx_overrun),
+};
+
+static int
+mv643xx_eth_get_link_ksettings_phy(struct mv643xx_eth_private *mp,
+				   struct ethtool_link_ksettings *cmd)
+{
+	struct net_device *dev = mp->dev;
+
+	phy_ethtool_ksettings_get(dev->phydev, cmd);
+
+	/*
+	 * The MAC does not support 1000baseT_Half.
+	 */
+	linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
+			   cmd->link_modes.supported);
+	linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
+			   cmd->link_modes.advertising);
+
+	return 0;
+}
+
+static int
+mv643xx_eth_get_link_ksettings_phyless(struct mv643xx_eth_private *mp,
+				       struct ethtool_link_ksettings *cmd)
+{
+	u32 port_status;
+	u32 supported, advertising;
+
+	port_status = rdlp(mp, PORT_STATUS);
+
+	supported = SUPPORTED_MII;
+	advertising = ADVERTISED_MII;
+	switch (port_status & PORT_SPEED_MASK) {
+	case PORT_SPEED_10:
+		cmd->base.speed = SPEED_10;
+		break;
+	case PORT_SPEED_100:
+		cmd->base.speed = SPEED_100;
+		break;
+	case PORT_SPEED_1000:
+		cmd->base.speed = SPEED_1000;
+		break;
+	default:
+		cmd->base.speed = -1;
+		break;
+	}
+	cmd->base.duplex = (port_status & FULL_DUPLEX) ?
+		DUPLEX_FULL : DUPLEX_HALF;
+	cmd->base.port = PORT_MII;
+	cmd->base.phy_address = 0;
+	cmd->base.autoneg = AUTONEG_DISABLE;
+
+	ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
+						supported);
+	ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
+						advertising);
+
+	return 0;
+}
+
+static void
+mv643xx_eth_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
+{
+	wol->supported = 0;
+	wol->wolopts = 0;
+	if (dev->phydev)
+		phy_ethtool_get_wol(dev->phydev, wol);
+}
+
+static int
+mv643xx_eth_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
+{
+	int err;
+
+	if (!dev->phydev)
+		return -EOPNOTSUPP;
+
+	err = phy_ethtool_set_wol(dev->phydev, wol);
+	/* Given that mv643xx_eth works without the marvell-specific PHY driver,
+	 * this debugging hint is useful to have.
+	 */
+	if (err == -EOPNOTSUPP)
+		netdev_info(dev, "The PHY does not support set_wol, was CONFIG_MARVELL_PHY enabled?\n");
+	return err;
+}
+
+static int
+mv643xx_eth_get_link_ksettings(struct net_device *dev,
+			       struct ethtool_link_ksettings *cmd)
+{
+	struct mv643xx_eth_private *mp = netdev_priv(dev);
+
+	if (dev->phydev)
+		return mv643xx_eth_get_link_ksettings_phy(mp, cmd);
+	else
+		return mv643xx_eth_get_link_ksettings_phyless(mp, cmd);
+}
+
+static int
+mv643xx_eth_set_link_ksettings(struct net_device *dev,
+			       const struct ethtool_link_ksettings *cmd)
+{
+	struct ethtool_link_ksettings c = *cmd;
+	u32 advertising;
+	int ret;
+
+	if (!dev->phydev)
+		return -EINVAL;
+
+	/*
+	 * The MAC does not support 1000baseT_Half.
+	 */
+	ethtool_convert_link_mode_to_legacy_u32(&advertising,
+						c.link_modes.advertising);
+	advertising &= ~ADVERTISED_1000baseT_Half;
+	ethtool_convert_legacy_u32_to_link_mode(c.link_modes.advertising,
+						advertising);
+
+	ret = phy_ethtool_ksettings_set(dev->phydev, &c);
+	if (!ret)
+		mv643xx_eth_adjust_link(dev);
+	return ret;
+}
+
+static void mv643xx_eth_get_drvinfo(struct net_device *dev,
+				    struct ethtool_drvinfo *drvinfo)
+{
+	strscpy(drvinfo->driver, mv643xx_eth_driver_name,
+		sizeof(drvinfo->driver));
+	strscpy(drvinfo->version, mv643xx_eth_driver_version,
+		sizeof(drvinfo->version));
+	strscpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
+	strscpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
+}
+
+static int mv643xx_eth_get_coalesce(struct net_device *dev,
+				    struct ethtool_coalesce *ec,
+				    struct kernel_ethtool_coalesce *kernel_coal,
+				    struct netlink_ext_ack *extack)
+{
+	struct mv643xx_eth_private *mp = netdev_priv(dev);
+
+	ec->rx_coalesce_usecs = get_rx_coal(mp);
+	ec->tx_coalesce_usecs = get_tx_coal(mp);
+
+	return 0;
+}
+
+static int mv643xx_eth_set_coalesce(struct net_device *dev,
+				    struct ethtool_coalesce *ec,
+				    struct kernel_ethtool_coalesce *kernel_coal,
+				    struct netlink_ext_ack *extack)
+{
+	struct mv643xx_eth_private *mp = netdev_priv(dev);
+
+	set_rx_coal(mp, ec->rx_coalesce_usecs);
+	set_tx_coal(mp, ec->tx_coalesce_usecs);
+
+	return 0;
+}
+
+static void
+mv643xx_eth_get_ringparam(struct net_device *dev, struct ethtool_ringparam *er,
+			  struct kernel_ethtool_ringparam *kernel_er,
+			  struct netlink_ext_ack *extack)
+{
+	struct mv643xx_eth_private *mp = netdev_priv(dev);
+
+	er->rx_max_pending = 4096;
+	er->tx_max_pending = 4096;
+
+	er->rx_pending = mp->rx_ring_size;
+	er->tx_pending = mp->tx_ring_size;
+}
+
+static int
+mv643xx_eth_set_ringparam(struct net_device *dev, struct ethtool_ringparam *er,
+			  struct kernel_ethtool_ringparam *kernel_er,
+			  struct netlink_ext_ack *extack)
+{
+	struct mv643xx_eth_private *mp = netdev_priv(dev);
+
+	if (er->rx_mini_pending || er->rx_jumbo_pending)
+		return -EINVAL;
+
+	mp->rx_ring_size = min(er->rx_pending, 4096U);
+	mp->tx_ring_size = clamp_t(unsigned int, er->tx_pending,
+				   MV643XX_MAX_SKB_DESCS * 2, 4096);
+	if (mp->tx_ring_size != er->tx_pending)
+		netdev_warn(dev, "TX queue size set to %u (requested %u)\n",
+			    mp->tx_ring_size, er->tx_pending);
+
+	if (netif_running(dev)) {
+		mv643xx_eth_stop(dev);
+		if (mv643xx_eth_open(dev)) {
+			netdev_err(dev,
+				   "fatal error on re-opening device after ring param change\n");
+			return -ENOMEM;
+		}
+	}
+
+	return 0;
+}
+
+
+static int
+mv643xx_eth_set_features(struct net_device *dev, netdev_features_t features)
+{
+	struct mv643xx_eth_private *mp = netdev_priv(dev);
+	bool rx_csum = features & NETIF_F_RXCSUM;
+
+	wrlp(mp, PORT_CONFIG, rx_csum ? 0x02000000 : 0x00000000);
+
+	return 0;
+}
+
+static void mv643xx_eth_get_strings(struct net_device *dev,
+				    uint32_t stringset, uint8_t *data)
+{
+	int i;
+
+	if (stringset == ETH_SS_STATS) {
+		for (i = 0; i < ARRAY_SIZE(mv643xx_eth_stats); i++) {
+			memcpy(data + i * ETH_GSTRING_LEN,
+				mv643xx_eth_stats[i].stat_string,
+				ETH_GSTRING_LEN);
+		}
+	}
+}
+
+static void mv643xx_eth_get_ethtool_stats(struct net_device *dev,
+					  struct ethtool_stats *stats,
+					  uint64_t *data)
+{
+	struct mv643xx_eth_private *mp = netdev_priv(dev);
+	int i;
+
+	mv643xx_eth_get_stats(dev);
+	mib_counters_update(mp);
+
+	for (i = 0; i < ARRAY_SIZE(mv643xx_eth_stats); i++) {
+		const struct mv643xx_eth_stats *stat;
+		void *p;
+
+		stat = mv643xx_eth_stats + i;
+
+		if (stat->netdev_off >= 0)
+			p = ((void *)mp->dev) + stat->netdev_off;
+		else
+			p = ((void *)mp) + stat->mp_off;
+
+		data[i] = (stat->sizeof_stat == 8) ?
+				*(uint64_t *)p : *(uint32_t *)p;
+	}
+}
+
+static int mv643xx_eth_get_sset_count(struct net_device *dev, int sset)
+{
+	if (sset == ETH_SS_STATS)
+		return ARRAY_SIZE(mv643xx_eth_stats);
+
+	return -EOPNOTSUPP;
+}
+
+static const struct ethtool_ops mv643xx_eth_ethtool_ops = {
+	.supported_coalesce_params = ETHTOOL_COALESCE_USECS,
+	.get_drvinfo		= mv643xx_eth_get_drvinfo,
+	.nway_reset		= phy_ethtool_nway_reset,
+	.get_link		= ethtool_op_get_link,
+	.get_coalesce		= mv643xx_eth_get_coalesce,
+	.set_coalesce		= mv643xx_eth_set_coalesce,
+	.get_ringparam		= mv643xx_eth_get_ringparam,
+	.set_ringparam		= mv643xx_eth_set_ringparam,
+	.get_strings		= mv643xx_eth_get_strings,
+	.get_ethtool_stats	= mv643xx_eth_get_ethtool_stats,
+	.get_sset_count		= mv643xx_eth_get_sset_count,
+	.get_ts_info		= ethtool_op_get_ts_info,
+	.get_wol                = mv643xx_eth_get_wol,
+	.set_wol                = mv643xx_eth_set_wol,
+	.get_link_ksettings	= mv643xx_eth_get_link_ksettings,
+	.set_link_ksettings	= mv643xx_eth_set_link_ksettings,
+};
+
+
+/* address handling *********************************************************/
+static void uc_addr_get(struct mv643xx_eth_private *mp, unsigned char *addr)
+{
+	unsigned int mac_h = rdlp(mp, MAC_ADDR_HIGH);
+	unsigned int mac_l = rdlp(mp, MAC_ADDR_LOW);
+
+	addr[0] = (mac_h >> 24) & 0xff;
+	addr[1] = (mac_h >> 16) & 0xff;
+	addr[2] = (mac_h >> 8) & 0xff;
+	addr[3] = mac_h & 0xff;
+	addr[4] = (mac_l >> 8) & 0xff;
+	addr[5] = mac_l & 0xff;
+}
+
+static void uc_addr_set(struct mv643xx_eth_private *mp, const u8 *addr)
+{
+	wrlp(mp, MAC_ADDR_HIGH,
+		(addr[0] << 24) | (addr[1] << 16) | (addr[2] << 8) | addr[3]);
+	wrlp(mp, MAC_ADDR_LOW, (addr[4] << 8) | addr[5]);
+}
+
+static u32 uc_addr_filter_mask(struct net_device *dev)
+{
+	struct netdev_hw_addr *ha;
+	u32 nibbles;
+
+	if (dev->flags & IFF_PROMISC)
+		return 0;
+
+	nibbles = 1 << (dev->dev_addr[5] & 0x0f);
+	netdev_for_each_uc_addr(ha, dev) {
+		if (memcmp(dev->dev_addr, ha->addr, 5))
+			return 0;
+		if ((dev->dev_addr[5] ^ ha->addr[5]) & 0xf0)
+			return 0;
+
+		nibbles |= 1 << (ha->addr[5] & 0x0f);
+	}
+
+	return nibbles;
+}
+
+static void mv643xx_eth_program_unicast_filter(struct net_device *dev)
+{
+	struct mv643xx_eth_private *mp = netdev_priv(dev);
+	u32 port_config;
+	u32 nibbles;
+	int i;
+
+	uc_addr_set(mp, dev->dev_addr);
+
+	port_config = rdlp(mp, PORT_CONFIG) & ~UNICAST_PROMISCUOUS_MODE;
+
+	nibbles = uc_addr_filter_mask(dev);
+	if (!nibbles) {
+		port_config |= UNICAST_PROMISCUOUS_MODE;
+		nibbles = 0xffff;
+	}
+
+	for (i = 0; i < 16; i += 4) {
+		int off = UNICAST_TABLE(mp->port_num) + i;
+		u32 v;
+
+		v = 0;
+		if (nibbles & 1)
+			v |= 0x00000001;
+		if (nibbles & 2)
+			v |= 0x00000100;
+		if (nibbles & 4)
+			v |= 0x00010000;
+		if (nibbles & 8)
+			v |= 0x01000000;
+		nibbles >>= 4;
+
+		wrl(mp, off, v);
+	}
+
+	wrlp(mp, PORT_CONFIG, port_config);
+}
+
+static int addr_crc(unsigned char *addr)
+{
+	int crc = 0;
+	int i;
+
+	for (i = 0; i < 6; i++) {
+		int j;
+
+		crc = (crc ^ addr[i]) << 8;
+		for (j = 7; j >= 0; j--) {
+			if (crc & (0x100 << j))
+				crc ^= 0x107 << j;
+		}
+	}
+
+	return crc;
+}
+
+static void mv643xx_eth_program_multicast_filter(struct net_device *dev)
+{
+	struct mv643xx_eth_private *mp = netdev_priv(dev);
+	u32 *mc_spec;
+	u32 *mc_other;
+	struct netdev_hw_addr *ha;
+	int i;
+
+	if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI))
+		goto promiscuous;
+
+	/* Allocate both mc_spec and mc_other tables */
+	mc_spec = kcalloc(128, sizeof(u32), GFP_ATOMIC);
+	if (!mc_spec)
+		goto promiscuous;
+	mc_other = &mc_spec[64];
+
+	netdev_for_each_mc_addr(ha, dev) {
+		u8 *a = ha->addr;
+		u32 *table;
+		u8 entry;
+
+		if (memcmp(a, "\x01\x00\x5e\x00\x00", 5) == 0) {
+			table = mc_spec;
+			entry = a[5];
+		} else {
+			table = mc_other;
+			entry = addr_crc(a);
+		}
+
+		table[entry >> 2] |= 1 << (8 * (entry & 3));
+	}
+
+	for (i = 0; i < 64; i++) {
+		wrl(mp, SPECIAL_MCAST_TABLE(mp->port_num) + i * sizeof(u32),
+		    mc_spec[i]);
+		wrl(mp, OTHER_MCAST_TABLE(mp->port_num) + i * sizeof(u32),
+		    mc_other[i]);
+	}
+
+	kfree(mc_spec);
+	return;
+
+promiscuous:
+	for (i = 0; i < 64; i++) {
+		wrl(mp, SPECIAL_MCAST_TABLE(mp->port_num) + i * sizeof(u32),
+		    0x01010101u);
+		wrl(mp, OTHER_MCAST_TABLE(mp->port_num) + i * sizeof(u32),
+		    0x01010101u);
+	}
+}
+
+static void mv643xx_eth_set_rx_mode(struct net_device *dev)
+{
+	mv643xx_eth_program_unicast_filter(dev);
+	mv643xx_eth_program_multicast_filter(dev);
+}
+
+static int mv643xx_eth_set_mac_address(struct net_device *dev, void *addr)
+{
+	struct sockaddr *sa = addr;
+
+	if (!is_valid_ether_addr(sa->sa_data))
+		return -EADDRNOTAVAIL;
+
+	eth_hw_addr_set(dev, sa->sa_data);
+
+	netif_addr_lock_bh(dev);
+	mv643xx_eth_program_unicast_filter(dev);
+	netif_addr_unlock_bh(dev);
+
+	return 0;
+}
+
+
+/* rx/tx queue initialisation ***********************************************/
+static int rxq_init(struct mv643xx_eth_private *mp, int index)
+{
+	struct rx_queue *rxq = mp->rxq + index;
+	struct rx_desc *rx_desc;
+	int size;
+	int i;
+
+	rxq->index = index;
+
+	rxq->rx_ring_size = mp->rx_ring_size;
+
+	rxq->rx_desc_count = 0;
+	rxq->rx_curr_desc = 0;
+	rxq->rx_used_desc = 0;
+
+	size = rxq->rx_ring_size * sizeof(struct rx_desc);
+
+	if (index == 0 && size <= mp->rx_desc_sram_size) {
+		rxq->rx_desc_area = ioremap(mp->rx_desc_sram_addr,
+						mp->rx_desc_sram_size);
+		rxq->rx_desc_dma = mp->rx_desc_sram_addr;
+	} else {
+		rxq->rx_desc_area = dma_alloc_coherent(mp->dev->dev.parent,
+						       size, &rxq->rx_desc_dma,
+						       GFP_KERNEL);
+	}
+
+	if (rxq->rx_desc_area == NULL) {
+		netdev_err(mp->dev,
+			   "can't allocate rx ring (%d bytes)\n", size);
+		goto out;
+	}
+	memset(rxq->rx_desc_area, 0, size);
+
+	rxq->rx_desc_area_size = size;
+	rxq->rx_skb = kcalloc(rxq->rx_ring_size, sizeof(*rxq->rx_skb),
+				    GFP_KERNEL);
+	if (rxq->rx_skb == NULL)
+		goto out_free;
+
+	rx_desc = rxq->rx_desc_area;
+	for (i = 0; i < rxq->rx_ring_size; i++) {
+		int nexti;
+
+		nexti = i + 1;
+		if (nexti == rxq->rx_ring_size)
+			nexti = 0;
+
+		rx_desc[i].next_desc_ptr = rxq->rx_desc_dma +
+					nexti * sizeof(struct rx_desc);
+	}
+
+	return 0;
+
+
+out_free:
+	if (index == 0 && size <= mp->rx_desc_sram_size)
+		iounmap(rxq->rx_desc_area);
+	else
+		dma_free_coherent(mp->dev->dev.parent, size,
+				  rxq->rx_desc_area,
+				  rxq->rx_desc_dma);
+
+out:
+	return -ENOMEM;
+}
+
+static void rxq_deinit(struct rx_queue *rxq)
+{
+	struct mv643xx_eth_private *mp = rxq_to_mp(rxq);
+	int i;
+
+	rxq_disable(rxq);
+
+	for (i = 0; i < rxq->rx_ring_size; i++) {
+		if (rxq->rx_skb[i]) {
+			dev_consume_skb_any(rxq->rx_skb[i]);
+			rxq->rx_desc_count--;
+		}
+	}
+
+	if (rxq->rx_desc_count) {
+		netdev_err(mp->dev, "error freeing rx ring -- %d skbs stuck\n",
+			   rxq->rx_desc_count);
+	}
+
+	if (rxq->index == 0 &&
+	    rxq->rx_desc_area_size <= mp->rx_desc_sram_size)
+		iounmap(rxq->rx_desc_area);
+	else
+		dma_free_coherent(mp->dev->dev.parent, rxq->rx_desc_area_size,
+				  rxq->rx_desc_area, rxq->rx_desc_dma);
+
+	kfree(rxq->rx_skb);
+}
+
+static int txq_init(struct mv643xx_eth_private *mp, int index)
+{
+	struct tx_queue *txq = mp->txq + index;
+	struct tx_desc *tx_desc;
+	int size;
+	int ret;
+	int i;
+
+	txq->index = index;
+
+	txq->tx_ring_size = mp->tx_ring_size;
+
+	/* A queue must always have room for at least one skb.
+	 * Therefore, stop the queue when the free entries reaches
+	 * the maximum number of descriptors per skb.
+	 */
+	txq->tx_stop_threshold = txq->tx_ring_size - MV643XX_MAX_SKB_DESCS;
+	txq->tx_wake_threshold = txq->tx_stop_threshold / 2;
+
+	txq->tx_desc_count = 0;
+	txq->tx_curr_desc = 0;
+	txq->tx_used_desc = 0;
+
+	size = txq->tx_ring_size * sizeof(struct tx_desc);
+
+	if (index == 0 && size <= mp->tx_desc_sram_size) {
+		txq->tx_desc_area = ioremap(mp->tx_desc_sram_addr,
+						mp->tx_desc_sram_size);
+		txq->tx_desc_dma = mp->tx_desc_sram_addr;
+	} else {
+		txq->tx_desc_area = dma_alloc_coherent(mp->dev->dev.parent,
+						       size, &txq->tx_desc_dma,
+						       GFP_KERNEL);
+	}
+
+	if (txq->tx_desc_area == NULL) {
+		netdev_err(mp->dev,
+			   "can't allocate tx ring (%d bytes)\n", size);
+		return -ENOMEM;
+	}
+	memset(txq->tx_desc_area, 0, size);
+
+	txq->tx_desc_area_size = size;
+
+	tx_desc = txq->tx_desc_area;
+	for (i = 0; i < txq->tx_ring_size; i++) {
+		struct tx_desc *txd = tx_desc + i;
+		int nexti;
+
+		nexti = i + 1;
+		if (nexti == txq->tx_ring_size)
+			nexti = 0;
+
+		txd->cmd_sts = 0;
+		txd->next_desc_ptr = txq->tx_desc_dma +
+					nexti * sizeof(struct tx_desc);
+	}
+
+	txq->tx_desc_mapping = kcalloc(txq->tx_ring_size, sizeof(char),
+				       GFP_KERNEL);
+	if (!txq->tx_desc_mapping) {
+		ret = -ENOMEM;
+		goto err_free_desc_area;
+	}
+
+	/* Allocate DMA buffers for TSO MAC/IP/TCP headers */
+	txq->tso_hdrs = dma_alloc_coherent(mp->dev->dev.parent,
+					   txq->tx_ring_size * TSO_HEADER_SIZE,
+					   &txq->tso_hdrs_dma, GFP_KERNEL);
+	if (txq->tso_hdrs == NULL) {
+		ret = -ENOMEM;
+		goto err_free_desc_mapping;
+	}
+	skb_queue_head_init(&txq->tx_skb);
+
+	return 0;
+
+err_free_desc_mapping:
+	kfree(txq->tx_desc_mapping);
+err_free_desc_area:
+	if (index == 0 && size <= mp->tx_desc_sram_size)
+		iounmap(txq->tx_desc_area);
+	else
+		dma_free_coherent(mp->dev->dev.parent, txq->tx_desc_area_size,
+				  txq->tx_desc_area, txq->tx_desc_dma);
+	return ret;
+}
+
+static void txq_deinit(struct tx_queue *txq)
+{
+	struct mv643xx_eth_private *mp = txq_to_mp(txq);
+
+	txq_disable(txq);
+	txq_reclaim(txq, txq->tx_ring_size, 1);
+
+	BUG_ON(txq->tx_used_desc != txq->tx_curr_desc);
+
+	if (txq->index == 0 &&
+	    txq->tx_desc_area_size <= mp->tx_desc_sram_size)
+		iounmap(txq->tx_desc_area);
+	else
+		dma_free_coherent(mp->dev->dev.parent, txq->tx_desc_area_size,
+				  txq->tx_desc_area, txq->tx_desc_dma);
+	kfree(txq->tx_desc_mapping);
+
+	if (txq->tso_hdrs)
+		dma_free_coherent(mp->dev->dev.parent,
+				  txq->tx_ring_size * TSO_HEADER_SIZE,
+				  txq->tso_hdrs, txq->tso_hdrs_dma);
+}
+
+
+/* netdev ops and related ***************************************************/
+static int mv643xx_eth_collect_events(struct mv643xx_eth_private *mp)
+{
+	u32 int_cause;
+	u32 int_cause_ext;
+
+	int_cause = rdlp(mp, INT_CAUSE) & mp->int_mask;
+	if (int_cause == 0)
+		return 0;
+
+	int_cause_ext = 0;
+	if (int_cause & INT_EXT) {
+		int_cause &= ~INT_EXT;
+		int_cause_ext = rdlp(mp, INT_CAUSE_EXT);
+	}
+
+	if (int_cause) {
+		wrlp(mp, INT_CAUSE, ~int_cause);
+		mp->work_tx_end |= ((int_cause & INT_TX_END) >> 19) &
+				~(rdlp(mp, TXQ_COMMAND) & 0xff);
+		mp->work_rx |= (int_cause & INT_RX) >> 2;
+	}
+
+	int_cause_ext &= INT_EXT_LINK_PHY | INT_EXT_TX;
+	if (int_cause_ext) {
+		wrlp(mp, INT_CAUSE_EXT, ~int_cause_ext);
+		if (int_cause_ext & INT_EXT_LINK_PHY)
+			mp->work_link = 1;
+		mp->work_tx |= int_cause_ext & INT_EXT_TX;
+	}
+
+	return 1;
+}
+
+static irqreturn_t mv643xx_eth_irq(int irq, void *dev_id)
+{
+	struct net_device *dev = (struct net_device *)dev_id;
+	struct mv643xx_eth_private *mp = netdev_priv(dev);
+
+	if (unlikely(!mv643xx_eth_collect_events(mp)))
+		return IRQ_NONE;
+
+	wrlp(mp, INT_MASK, 0);
+	napi_schedule(&mp->napi);
+
+	return IRQ_HANDLED;
+}
+
+static void handle_link_event(struct mv643xx_eth_private *mp)
+{
+	struct net_device *dev = mp->dev;
+	u32 port_status;
+	int speed;
+	int duplex;
+	int fc;
+
+	port_status = rdlp(mp, PORT_STATUS);
+	if (!(port_status & LINK_UP)) {
+		if (netif_carrier_ok(dev)) {
+			int i;
+
+			netdev_info(dev, "link down\n");
+
+			netif_carrier_off(dev);
+
+			for (i = 0; i < mp->txq_count; i++) {
+				struct tx_queue *txq = mp->txq + i;
+
+				txq_reclaim(txq, txq->tx_ring_size, 1);
+				txq_reset_hw_ptr(txq);
+			}
+		}
+		return;
+	}
+
+	switch (port_status & PORT_SPEED_MASK) {
+	case PORT_SPEED_10:
+		speed = 10;
+		break;
+	case PORT_SPEED_100:
+		speed = 100;
+		break;
+	case PORT_SPEED_1000:
+		speed = 1000;
+		break;
+	default:
+		speed = -1;
+		break;
+	}
+	duplex = (port_status & FULL_DUPLEX) ? 1 : 0;
+	fc = (port_status & FLOW_CONTROL_ENABLED) ? 1 : 0;
+
+	netdev_info(dev, "link up, %d Mb/s, %s duplex, flow control %sabled\n",
+		    speed, duplex ? "full" : "half", fc ? "en" : "dis");
+
+	if (!netif_carrier_ok(dev))
+		netif_carrier_on(dev);
+}
+
+static int mv643xx_eth_poll(struct napi_struct *napi, int budget)
+{
+	struct mv643xx_eth_private *mp;
+	int work_done;
+
+	mp = container_of(napi, struct mv643xx_eth_private, napi);
+
+	if (unlikely(mp->oom)) {
+		mp->oom = 0;
+		del_timer(&mp->rx_oom);
+	}
+
+	work_done = 0;
+	while (work_done < budget) {
+		u8 queue_mask;
+		int queue;
+		int work_tbd;
+
+		if (mp->work_link) {
+			mp->work_link = 0;
+			handle_link_event(mp);
+			work_done++;
+			continue;
+		}
+
+		queue_mask = mp->work_tx | mp->work_tx_end | mp->work_rx;
+		if (likely(!mp->oom))
+			queue_mask |= mp->work_rx_refill;
+
+		if (!queue_mask) {
+			if (mv643xx_eth_collect_events(mp))
+				continue;
+			break;
+		}
+
+		queue = fls(queue_mask) - 1;
+		queue_mask = 1 << queue;
+
+		work_tbd = budget - work_done;
+		if (work_tbd > 16)
+			work_tbd = 16;
+
+		if (mp->work_tx_end & queue_mask) {
+			txq_kick(mp->txq + queue);
+		} else if (mp->work_tx & queue_mask) {
+			work_done += txq_reclaim(mp->txq + queue, work_tbd, 0);
+			txq_maybe_wake(mp->txq + queue);
+		} else if (mp->work_rx & queue_mask) {
+			work_done += rxq_process(mp->rxq + queue, work_tbd);
+		} else if (!mp->oom && (mp->work_rx_refill & queue_mask)) {
+			work_done += rxq_refill(mp->rxq + queue, work_tbd);
+		} else {
+			BUG();
+		}
+	}
+
+	if (work_done < budget) {
+		if (mp->oom)
+			mod_timer(&mp->rx_oom, jiffies + (HZ / 10));
+		napi_complete_done(napi, work_done);
+		wrlp(mp, INT_MASK, mp->int_mask);
+	}
+
+	return work_done;
+}
+
+static inline void oom_timer_wrapper(struct timer_list *t)
+{
+	struct mv643xx_eth_private *mp = from_timer(mp, t, rx_oom);
+
+	napi_schedule(&mp->napi);
+}
+
+static void port_start(struct mv643xx_eth_private *mp)
+{
+	struct net_device *dev = mp->dev;
+	u32 pscr;
+	int i;
+
+	/*
+	 * Perform PHY reset, if there is a PHY.
+	 */
+	if (dev->phydev) {
+		struct ethtool_link_ksettings cmd;
+
+		mv643xx_eth_get_link_ksettings(dev, &cmd);
+		phy_init_hw(dev->phydev);
+		mv643xx_eth_set_link_ksettings(
+			dev, (const struct ethtool_link_ksettings *)&cmd);
+		phy_start(dev->phydev);
+	}
+
+	/*
+	 * Configure basic link parameters.
+	 */
+	pscr = rdlp(mp, PORT_SERIAL_CONTROL);
+
+	pscr |= SERIAL_PORT_ENABLE;
+	wrlp(mp, PORT_SERIAL_CONTROL, pscr);
+
+	pscr |= DO_NOT_FORCE_LINK_FAIL;
+	if (!dev->phydev)
+		pscr |= FORCE_LINK_PASS;
+	wrlp(mp, PORT_SERIAL_CONTROL, pscr);
+
+	/*
+	 * Configure TX path and queues.
+	 */
+	tx_set_rate(mp, 1000000000, 16777216);
+	for (i = 0; i < mp->txq_count; i++) {
+		struct tx_queue *txq = mp->txq + i;
+
+		txq_reset_hw_ptr(txq);
+		txq_set_rate(txq, 1000000000, 16777216);
+		txq_set_fixed_prio_mode(txq);
+	}
+
+	/*
+	 * Receive all unmatched unicast, TCP, UDP, BPDU and broadcast
+	 * frames to RX queue #0, and include the pseudo-header when
+	 * calculating receive checksums.
+	 */
+	mv643xx_eth_set_features(mp->dev, mp->dev->features);
+
+	/*
+	 * Treat BPDUs as normal multicasts, and disable partition mode.
+	 */
+	wrlp(mp, PORT_CONFIG_EXT, 0x00000000);
+
+	/*
+	 * Add configured unicast addresses to address filter table.
+	 */
+	mv643xx_eth_program_unicast_filter(mp->dev);
+
+	/*
+	 * Enable the receive queues.
+	 */
+	for (i = 0; i < mp->rxq_count; i++) {
+		struct rx_queue *rxq = mp->rxq + i;
+		u32 addr;
+
+		addr = (u32)rxq->rx_desc_dma;
+		addr += rxq->rx_curr_desc * sizeof(struct rx_desc);
+		wrlp(mp, RXQ_CURRENT_DESC_PTR(i), addr);
+
+		rxq_enable(rxq);
+	}
+}
+
+static void mv643xx_eth_recalc_skb_size(struct mv643xx_eth_private *mp)
+{
+	int skb_size;
+
+	/*
+	 * Reserve 2+14 bytes for an ethernet header (the hardware
+	 * automatically prepends 2 bytes of dummy data to each
+	 * received packet), 16 bytes for up to four VLAN tags, and
+	 * 4 bytes for the trailing FCS -- 36 bytes total.
+	 */
+	skb_size = mp->dev->mtu + 36;
+
+	/*
+	 * Make sure that the skb size is a multiple of 8 bytes, as
+	 * the lower three bits of the receive descriptor's buffer
+	 * size field are ignored by the hardware.
+	 */
+	mp->skb_size = (skb_size + 7) & ~7;
+
+	/*
+	 * If NET_SKB_PAD is smaller than a cache line,
+	 * netdev_alloc_skb() will cause skb->data to be misaligned
+	 * to a cache line boundary.  If this is the case, include
+	 * some extra space to allow re-aligning the data area.
+	 */
+	mp->skb_size += SKB_DMA_REALIGN;
+}
+
+static int mv643xx_eth_open(struct net_device *dev)
+{
+	struct mv643xx_eth_private *mp = netdev_priv(dev);
+	int err;
+	int i;
+
+	wrlp(mp, INT_CAUSE, 0);
+	wrlp(mp, INT_CAUSE_EXT, 0);
+	rdlp(mp, INT_CAUSE_EXT);
+
+	err = request_irq(dev->irq, mv643xx_eth_irq,
+			  IRQF_SHARED, dev->name, dev);
+	if (err) {
+		netdev_err(dev, "can't assign irq\n");
+		return -EAGAIN;
+	}
+
+	mv643xx_eth_recalc_skb_size(mp);
+
+	napi_enable(&mp->napi);
+
+	mp->int_mask = INT_EXT;
+
+	for (i = 0; i < mp->rxq_count; i++) {
+		err = rxq_init(mp, i);
+		if (err) {
+			while (--i >= 0)
+				rxq_deinit(mp->rxq + i);
+			goto out;
+		}
+
+		rxq_refill(mp->rxq + i, INT_MAX);
+		mp->int_mask |= INT_RX_0 << i;
+	}
+
+	if (mp->oom) {
+		mp->rx_oom.expires = jiffies + (HZ / 10);
+		add_timer(&mp->rx_oom);
+	}
+
+	for (i = 0; i < mp->txq_count; i++) {
+		err = txq_init(mp, i);
+		if (err) {
+			while (--i >= 0)
+				txq_deinit(mp->txq + i);
+			goto out_free;
+		}
+		mp->int_mask |= INT_TX_END_0 << i;
+	}
+
+	add_timer(&mp->mib_counters_timer);
+	port_start(mp);
+
+	wrlp(mp, INT_MASK_EXT, INT_EXT_LINK_PHY | INT_EXT_TX);
+	wrlp(mp, INT_MASK, mp->int_mask);
+
+	return 0;
+
+
+out_free:
+	for (i = 0; i < mp->rxq_count; i++)
+		rxq_deinit(mp->rxq + i);
+out:
+	napi_disable(&mp->napi);
+	free_irq(dev->irq, dev);
+
+	return err;
+}
+
+static void port_reset(struct mv643xx_eth_private *mp)
+{
+	unsigned int data;
+	int i;
+
+	for (i = 0; i < mp->rxq_count; i++)
+		rxq_disable(mp->rxq + i);
+	for (i = 0; i < mp->txq_count; i++)
+		txq_disable(mp->txq + i);
+
+	while (1) {
+		u32 ps = rdlp(mp, PORT_STATUS);
+
+		if ((ps & (TX_IN_PROGRESS | TX_FIFO_EMPTY)) == TX_FIFO_EMPTY)
+			break;
+		udelay(10);
+	}
+
+	/* Reset the Enable bit in the Configuration Register */
+	data = rdlp(mp, PORT_SERIAL_CONTROL);
+	data &= ~(SERIAL_PORT_ENABLE		|
+		  DO_NOT_FORCE_LINK_FAIL	|
+		  FORCE_LINK_PASS);
+	wrlp(mp, PORT_SERIAL_CONTROL, data);
+}
+
+static int mv643xx_eth_stop(struct net_device *dev)
+{
+	struct mv643xx_eth_private *mp = netdev_priv(dev);
+	int i;
+
+	wrlp(mp, INT_MASK_EXT, 0x00000000);
+	wrlp(mp, INT_MASK, 0x00000000);
+	rdlp(mp, INT_MASK);
+
+	napi_disable(&mp->napi);
+
+	del_timer_sync(&mp->rx_oom);
+
+	netif_carrier_off(dev);
+	if (dev->phydev)
+		phy_stop(dev->phydev);
+	free_irq(dev->irq, dev);
+
+	port_reset(mp);
+	mv643xx_eth_get_stats(dev);
+	mib_counters_update(mp);
+	del_timer_sync(&mp->mib_counters_timer);
+
+	for (i = 0; i < mp->rxq_count; i++)
+		rxq_deinit(mp->rxq + i);
+	for (i = 0; i < mp->txq_count; i++)
+		txq_deinit(mp->txq + i);
+
+	return 0;
+}
+
+static int mv643xx_eth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	int ret;
+
+	if (!dev->phydev)
+		return -ENOTSUPP;
+
+	ret = phy_mii_ioctl(dev->phydev, ifr, cmd);
+	if (!ret)
+		mv643xx_eth_adjust_link(dev);
+	return ret;
+}
+
+static int mv643xx_eth_change_mtu(struct net_device *dev, int new_mtu)
+{
+	struct mv643xx_eth_private *mp = netdev_priv(dev);
+
+	dev->mtu = new_mtu;
+	mv643xx_eth_recalc_skb_size(mp);
+	tx_set_rate(mp, 1000000000, 16777216);
+
+	if (!netif_running(dev))
+		return 0;
+
+	/*
+	 * Stop and then re-open the interface. This will allocate RX
+	 * skbs of the new MTU.
+	 * There is a possible danger that the open will not succeed,
+	 * due to memory being full.
+	 */
+	mv643xx_eth_stop(dev);
+	if (mv643xx_eth_open(dev)) {
+		netdev_err(dev,
+			   "fatal error on re-opening device after MTU change\n");
+	}
+
+	return 0;
+}
+
+static void tx_timeout_task(struct work_struct *ugly)
+{
+	struct mv643xx_eth_private *mp;
+
+	mp = container_of(ugly, struct mv643xx_eth_private, tx_timeout_task);
+	if (netif_running(mp->dev)) {
+		netif_tx_stop_all_queues(mp->dev);
+		port_reset(mp);
+		port_start(mp);
+		netif_tx_wake_all_queues(mp->dev);
+	}
+}
+
+static void mv643xx_eth_tx_timeout(struct net_device *dev, unsigned int txqueue)
+{
+	struct mv643xx_eth_private *mp = netdev_priv(dev);
+
+	netdev_info(dev, "tx timeout\n");
+
+	schedule_work(&mp->tx_timeout_task);
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void mv643xx_eth_netpoll(struct net_device *dev)
+{
+	struct mv643xx_eth_private *mp = netdev_priv(dev);
+
+	wrlp(mp, INT_MASK, 0x00000000);
+	rdlp(mp, INT_MASK);
+
+	mv643xx_eth_irq(dev->irq, dev);
+
+	wrlp(mp, INT_MASK, mp->int_mask);
+}
+#endif
+
+
+/* platform glue ************************************************************/
+static void
+mv643xx_eth_conf_mbus_windows(struct mv643xx_eth_shared_private *msp,
+			      const struct mbus_dram_target_info *dram)
+{
+	void __iomem *base = msp->base;
+	u32 win_enable;
+	u32 win_protect;
+	int i;
+
+	for (i = 0; i < 6; i++) {
+		writel(0, base + WINDOW_BASE(i));
+		writel(0, base + WINDOW_SIZE(i));
+		if (i < 4)
+			writel(0, base + WINDOW_REMAP_HIGH(i));
+	}
+
+	win_enable = 0x3f;
+	win_protect = 0;
+
+	for (i = 0; i < dram->num_cs; i++) {
+		const struct mbus_dram_window *cs = dram->cs + i;
+
+		writel((cs->base & 0xffff0000) |
+			(cs->mbus_attr << 8) |
+			dram->mbus_dram_target_id, base + WINDOW_BASE(i));
+		writel((cs->size - 1) & 0xffff0000, base + WINDOW_SIZE(i));
+
+		win_enable &= ~(1 << i);
+		win_protect |= 3 << (2 * i);
+	}
+
+	writel(win_enable, base + WINDOW_BAR_ENABLE);
+	msp->win_protect = win_protect;
+}
+
+static void infer_hw_params(struct mv643xx_eth_shared_private *msp)
+{
+	/*
+	 * Check whether we have a 14-bit coal limit field in bits
+	 * [21:8], or a 16-bit coal limit in bits [25,21:7] of the
+	 * SDMA config register.
+	 */
+	writel(0x02000000, msp->base + 0x0400 + SDMA_CONFIG);
+	if (readl(msp->base + 0x0400 + SDMA_CONFIG) & 0x02000000)
+		msp->extended_rx_coal_limit = 1;
+	else
+		msp->extended_rx_coal_limit = 0;
+
+	/*
+	 * Check whether the MAC supports TX rate control, and if
+	 * yes, whether its associated registers are in the old or
+	 * the new place.
+	 */
+	writel(1, msp->base + 0x0400 + TX_BW_MTU_MOVED);
+	if (readl(msp->base + 0x0400 + TX_BW_MTU_MOVED) & 1) {
+		msp->tx_bw_control = TX_BW_CONTROL_NEW_LAYOUT;
+	} else {
+		writel(7, msp->base + 0x0400 + TX_BW_RATE);
+		if (readl(msp->base + 0x0400 + TX_BW_RATE) & 7)
+			msp->tx_bw_control = TX_BW_CONTROL_OLD_LAYOUT;
+		else
+			msp->tx_bw_control = TX_BW_CONTROL_ABSENT;
+	}
+}
+
+#if defined(CONFIG_OF)
+static const struct of_device_id mv643xx_eth_shared_ids[] = {
+	{ .compatible = "marvell,orion-eth", },
+	{ .compatible = "marvell,kirkwood-eth", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, mv643xx_eth_shared_ids);
+#endif
+
+#ifdef CONFIG_OF_IRQ
+#define mv643xx_eth_property(_np, _name, _v)				\
+	do {								\
+		u32 tmp;						\
+		if (!of_property_read_u32(_np, "marvell," _name, &tmp))	\
+			_v = tmp;					\
+	} while (0)
+
+static struct platform_device *port_platdev[3];
+
+static void mv643xx_eth_shared_of_remove(void)
+{
+	int n;
+
+	for (n = 0; n < 3; n++) {
+		platform_device_del(port_platdev[n]);
+		port_platdev[n] = NULL;
+	}
+}
+
+static int mv643xx_eth_shared_of_add_port(struct platform_device *pdev,
+					  struct device_node *pnp)
+{
+	struct platform_device *ppdev;
+	struct mv643xx_eth_platform_data ppd;
+	struct resource res;
+	int ret;
+	int dev_num = 0;
+
+	memset(&ppd, 0, sizeof(ppd));
+	ppd.shared = pdev;
+
+	memset(&res, 0, sizeof(res));
+	if (of_irq_to_resource(pnp, 0, &res) <= 0) {
+		dev_err(&pdev->dev, "missing interrupt on %pOFn\n", pnp);
+		return -EINVAL;
+	}
+
+	if (of_property_read_u32(pnp, "reg", &ppd.port_number)) {
+		dev_err(&pdev->dev, "missing reg property on %pOFn\n", pnp);
+		return -EINVAL;
+	}
+
+	if (ppd.port_number >= 3) {
+		dev_err(&pdev->dev, "invalid reg property on %pOFn\n", pnp);
+		return -EINVAL;
+	}
+
+	while (dev_num < 3 && port_platdev[dev_num])
+		dev_num++;
+
+	if (dev_num == 3) {
+		dev_err(&pdev->dev, "too many ports registered\n");
+		return -EINVAL;
+	}
+
+	ret = of_get_mac_address(pnp, ppd.mac_addr);
+	if (ret == -EPROBE_DEFER)
+		return ret;
+
+	mv643xx_eth_property(pnp, "tx-queue-size", ppd.tx_queue_size);
+	mv643xx_eth_property(pnp, "tx-sram-addr", ppd.tx_sram_addr);
+	mv643xx_eth_property(pnp, "tx-sram-size", ppd.tx_sram_size);
+	mv643xx_eth_property(pnp, "rx-queue-size", ppd.rx_queue_size);
+	mv643xx_eth_property(pnp, "rx-sram-addr", ppd.rx_sram_addr);
+	mv643xx_eth_property(pnp, "rx-sram-size", ppd.rx_sram_size);
+
+	ppd.phy_node = of_parse_phandle(pnp, "phy-handle", 0);
+	if (!ppd.phy_node) {
+		ppd.phy_addr = MV643XX_ETH_PHY_NONE;
+		of_property_read_u32(pnp, "speed", &ppd.speed);
+		of_property_read_u32(pnp, "duplex", &ppd.duplex);
+	}
+
+	ppdev = platform_device_alloc(MV643XX_ETH_NAME, dev_num);
+	if (!ppdev)
+		return -ENOMEM;
+	ppdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+	ppdev->dev.of_node = pnp;
+
+	ret = platform_device_add_resources(ppdev, &res, 1);
+	if (ret)
+		goto port_err;
+
+	ret = platform_device_add_data(ppdev, &ppd, sizeof(ppd));
+	if (ret)
+		goto port_err;
+
+	ret = platform_device_add(ppdev);
+	if (ret)
+		goto port_err;
+
+	port_platdev[dev_num] = ppdev;
+
+	return 0;
+
+port_err:
+	platform_device_put(ppdev);
+	return ret;
+}
+
+static int mv643xx_eth_shared_of_probe(struct platform_device *pdev)
+{
+	struct mv643xx_eth_shared_platform_data *pd;
+	struct device_node *pnp, *np = pdev->dev.of_node;
+	int ret;
+
+	/* bail out if not registered from DT */
+	if (!np)
+		return 0;
+
+	pd = devm_kzalloc(&pdev->dev, sizeof(*pd), GFP_KERNEL);
+	if (!pd)
+		return -ENOMEM;
+	pdev->dev.platform_data = pd;
+
+	mv643xx_eth_property(np, "tx-checksum-limit", pd->tx_csum_limit);
+
+	for_each_available_child_of_node(np, pnp) {
+		ret = mv643xx_eth_shared_of_add_port(pdev, pnp);
+		if (ret) {
+			of_node_put(pnp);
+			mv643xx_eth_shared_of_remove();
+			return ret;
+		}
+	}
+	return 0;
+}
+
+#else
+static inline int mv643xx_eth_shared_of_probe(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static inline void mv643xx_eth_shared_of_remove(void)
+{
+}
+#endif
+
+static int mv643xx_eth_shared_probe(struct platform_device *pdev)
+{
+	static int mv643xx_eth_version_printed;
+	struct mv643xx_eth_shared_platform_data *pd;
+	struct mv643xx_eth_shared_private *msp;
+	const struct mbus_dram_target_info *dram;
+	struct resource *res;
+	int ret;
+
+	if (!mv643xx_eth_version_printed++)
+		pr_notice("MV-643xx 10/100/1000 ethernet driver version %s\n",
+			  mv643xx_eth_driver_version);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (res == NULL)
+		return -EINVAL;
+
+	msp = devm_kzalloc(&pdev->dev, sizeof(*msp), GFP_KERNEL);
+	if (msp == NULL)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, msp);
+
+	msp->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+	if (msp->base == NULL)
+		return -ENOMEM;
+
+	msp->clk = devm_clk_get(&pdev->dev, NULL);
+	if (!IS_ERR(msp->clk))
+		clk_prepare_enable(msp->clk);
+
+	/*
+	 * (Re-)program MBUS remapping windows if we are asked to.
+	 */
+	dram = mv_mbus_dram_info();
+	if (dram)
+		mv643xx_eth_conf_mbus_windows(msp, dram);
+
+	ret = mv643xx_eth_shared_of_probe(pdev);
+	if (ret)
+		goto err_put_clk;
+	pd = dev_get_platdata(&pdev->dev);
+
+	msp->tx_csum_limit = (pd != NULL && pd->tx_csum_limit) ?
+					pd->tx_csum_limit : 9 * 1024;
+	infer_hw_params(msp);
+
+	return 0;
+
+err_put_clk:
+	if (!IS_ERR(msp->clk))
+		clk_disable_unprepare(msp->clk);
+	return ret;
+}
+
+static int mv643xx_eth_shared_remove(struct platform_device *pdev)
+{
+	struct mv643xx_eth_shared_private *msp = platform_get_drvdata(pdev);
+
+	mv643xx_eth_shared_of_remove();
+	if (!IS_ERR(msp->clk))
+		clk_disable_unprepare(msp->clk);
+	return 0;
+}
+
+static struct platform_driver mv643xx_eth_shared_driver = {
+	.probe		= mv643xx_eth_shared_probe,
+	.remove		= mv643xx_eth_shared_remove,
+	.driver = {
+		.name	= MV643XX_ETH_SHARED_NAME,
+		.of_match_table = of_match_ptr(mv643xx_eth_shared_ids),
+	},
+};
+
+static void phy_addr_set(struct mv643xx_eth_private *mp, int phy_addr)
+{
+	int addr_shift = 5 * mp->port_num;
+	u32 data;
+
+	data = rdl(mp, PHY_ADDR);
+	data &= ~(0x1f << addr_shift);
+	data |= (phy_addr & 0x1f) << addr_shift;
+	wrl(mp, PHY_ADDR, data);
+}
+
+static int phy_addr_get(struct mv643xx_eth_private *mp)
+{
+	unsigned int data;
+
+	data = rdl(mp, PHY_ADDR);
+
+	return (data >> (5 * mp->port_num)) & 0x1f;
+}
+
+static void set_params(struct mv643xx_eth_private *mp,
+		       struct mv643xx_eth_platform_data *pd)
+{
+	struct net_device *dev = mp->dev;
+	unsigned int tx_ring_size;
+
+	if (is_valid_ether_addr(pd->mac_addr)) {
+		eth_hw_addr_set(dev, pd->mac_addr);
+	} else {
+		u8 addr[ETH_ALEN];
+
+		uc_addr_get(mp, addr);
+		eth_hw_addr_set(dev, addr);
+	}
+
+	mp->rx_ring_size = DEFAULT_RX_QUEUE_SIZE;
+	if (pd->rx_queue_size)
+		mp->rx_ring_size = pd->rx_queue_size;
+	mp->rx_desc_sram_addr = pd->rx_sram_addr;
+	mp->rx_desc_sram_size = pd->rx_sram_size;
+
+	mp->rxq_count = pd->rx_queue_count ? : 1;
+
+	tx_ring_size = DEFAULT_TX_QUEUE_SIZE;
+	if (pd->tx_queue_size)
+		tx_ring_size = pd->tx_queue_size;
+
+	mp->tx_ring_size = clamp_t(unsigned int, tx_ring_size,
+				   MV643XX_MAX_SKB_DESCS * 2, 4096);
+	if (mp->tx_ring_size != tx_ring_size)
+		netdev_warn(dev, "TX queue size set to %u (requested %u)\n",
+			    mp->tx_ring_size, tx_ring_size);
+
+	mp->tx_desc_sram_addr = pd->tx_sram_addr;
+	mp->tx_desc_sram_size = pd->tx_sram_size;
+
+	mp->txq_count = pd->tx_queue_count ? : 1;
+}
+
+static int get_phy_mode(struct mv643xx_eth_private *mp)
+{
+	struct device *dev = mp->dev->dev.parent;
+	phy_interface_t iface;
+	int err;
+
+	if (dev->of_node)
+		err = of_get_phy_mode(dev->of_node, &iface);
+
+	/* Historical default if unspecified. We could also read/write
+	 * the interface state in the PSC1
+	 */
+	if (!dev->of_node || err)
+		iface = PHY_INTERFACE_MODE_GMII;
+	return iface;
+}
+
+static struct phy_device *phy_scan(struct mv643xx_eth_private *mp,
+				   int phy_addr)
+{
+	struct phy_device *phydev;
+	int start;
+	int num;
+	int i;
+	char phy_id[MII_BUS_ID_SIZE + 3];
+
+	if (phy_addr == MV643XX_ETH_PHY_ADDR_DEFAULT) {
+		start = phy_addr_get(mp) & 0x1f;
+		num = 32;
+	} else {
+		start = phy_addr & 0x1f;
+		num = 1;
+	}
+
+	/* Attempt to connect to the PHY using orion-mdio */
+	phydev = ERR_PTR(-ENODEV);
+	for (i = 0; i < num; i++) {
+		int addr = (start + i) & 0x1f;
+
+		snprintf(phy_id, sizeof(phy_id), PHY_ID_FMT,
+				"orion-mdio-mii", addr);
+
+		phydev = phy_connect(mp->dev, phy_id, mv643xx_eth_adjust_link,
+				     get_phy_mode(mp));
+		if (!IS_ERR(phydev)) {
+			phy_addr_set(mp, addr);
+			break;
+		}
+	}
+
+	return phydev;
+}
+
+static void phy_init(struct mv643xx_eth_private *mp, int speed, int duplex)
+{
+	struct net_device *dev = mp->dev;
+	struct phy_device *phy = dev->phydev;
+
+	if (speed == 0) {
+		phy->autoneg = AUTONEG_ENABLE;
+		phy->speed = 0;
+		phy->duplex = 0;
+		linkmode_copy(phy->advertising, phy->supported);
+		linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
+				 phy->advertising);
+	} else {
+		phy->autoneg = AUTONEG_DISABLE;
+		linkmode_zero(phy->advertising);
+		phy->speed = speed;
+		phy->duplex = duplex;
+	}
+	phy_start_aneg(phy);
+}
+
+static void init_pscr(struct mv643xx_eth_private *mp, int speed, int duplex)
+{
+	struct net_device *dev = mp->dev;
+	u32 pscr;
+
+	pscr = rdlp(mp, PORT_SERIAL_CONTROL);
+	if (pscr & SERIAL_PORT_ENABLE) {
+		pscr &= ~SERIAL_PORT_ENABLE;
+		wrlp(mp, PORT_SERIAL_CONTROL, pscr);
+	}
+
+	pscr = MAX_RX_PACKET_9700BYTE | SERIAL_PORT_CONTROL_RESERVED;
+	if (!dev->phydev) {
+		pscr |= DISABLE_AUTO_NEG_SPEED_GMII;
+		if (speed == SPEED_1000)
+			pscr |= SET_GMII_SPEED_TO_1000;
+		else if (speed == SPEED_100)
+			pscr |= SET_MII_SPEED_TO_100;
+
+		pscr |= DISABLE_AUTO_NEG_FOR_FLOW_CTRL;
+
+		pscr |= DISABLE_AUTO_NEG_FOR_DUPLEX;
+		if (duplex == DUPLEX_FULL)
+			pscr |= SET_FULL_DUPLEX_MODE;
+	}
+
+	wrlp(mp, PORT_SERIAL_CONTROL, pscr);
+}
+
+static const struct net_device_ops mv643xx_eth_netdev_ops = {
+	.ndo_open		= mv643xx_eth_open,
+	.ndo_stop		= mv643xx_eth_stop,
+	.ndo_start_xmit		= mv643xx_eth_xmit,
+	.ndo_set_rx_mode	= mv643xx_eth_set_rx_mode,
+	.ndo_set_mac_address	= mv643xx_eth_set_mac_address,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_eth_ioctl		= mv643xx_eth_ioctl,
+	.ndo_change_mtu		= mv643xx_eth_change_mtu,
+	.ndo_set_features	= mv643xx_eth_set_features,
+	.ndo_tx_timeout		= mv643xx_eth_tx_timeout,
+	.ndo_get_stats		= mv643xx_eth_get_stats,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller	= mv643xx_eth_netpoll,
+#endif
+};
+
+static int mv643xx_eth_probe(struct platform_device *pdev)
+{
+	struct mv643xx_eth_platform_data *pd;
+	struct mv643xx_eth_private *mp;
+	struct net_device *dev;
+	struct phy_device *phydev = NULL;
+	int err, irq;
+
+	pd = dev_get_platdata(&pdev->dev);
+	if (pd == NULL) {
+		dev_err(&pdev->dev, "no mv643xx_eth_platform_data\n");
+		return -ENODEV;
+	}
+
+	if (pd->shared == NULL) {
+		dev_err(&pdev->dev, "no mv643xx_eth_platform_data->shared\n");
+		return -ENODEV;
+	}
+
+	dev = alloc_etherdev_mq(sizeof(struct mv643xx_eth_private), 8);
+	if (!dev)
+		return -ENOMEM;
+
+	SET_NETDEV_DEV(dev, &pdev->dev);
+	mp = netdev_priv(dev);
+	platform_set_drvdata(pdev, mp);
+
+	mp->shared = platform_get_drvdata(pd->shared);
+	mp->base = mp->shared->base + 0x0400 + (pd->port_number << 10);
+	mp->port_num = pd->port_number;
+
+	mp->dev = dev;
+
+	/* Kirkwood resets some registers on gated clocks. Especially
+	 * CLK125_BYPASS_EN must be cleared but is not available on
+	 * all other SoCs/System Controllers using this driver.
+	 */
+	if (of_device_is_compatible(pdev->dev.of_node,
+				    "marvell,kirkwood-eth-port"))
+		wrlp(mp, PORT_SERIAL_CONTROL1,
+		     rdlp(mp, PORT_SERIAL_CONTROL1) & ~CLK125_BYPASS_EN);
+
+	/*
+	 * Start with a default rate, and if there is a clock, allow
+	 * it to override the default.
+	 */
+	mp->t_clk = 133000000;
+	mp->clk = devm_clk_get(&pdev->dev, NULL);
+	if (!IS_ERR(mp->clk)) {
+		clk_prepare_enable(mp->clk);
+		mp->t_clk = clk_get_rate(mp->clk);
+	} else if (!IS_ERR(mp->shared->clk)) {
+		mp->t_clk = clk_get_rate(mp->shared->clk);
+	}
+
+	set_params(mp, pd);
+	netif_set_real_num_tx_queues(dev, mp->txq_count);
+	netif_set_real_num_rx_queues(dev, mp->rxq_count);
+
+	err = 0;
+	if (pd->phy_node) {
+		phydev = of_phy_connect(mp->dev, pd->phy_node,
+					mv643xx_eth_adjust_link, 0,
+					get_phy_mode(mp));
+		if (!phydev)
+			err = -ENODEV;
+		else
+			phy_addr_set(mp, phydev->mdio.addr);
+	} else if (pd->phy_addr != MV643XX_ETH_PHY_NONE) {
+		phydev = phy_scan(mp, pd->phy_addr);
+
+		if (IS_ERR(phydev))
+			err = PTR_ERR(phydev);
+		else
+			phy_init(mp, pd->speed, pd->duplex);
+	}
+	if (err == -ENODEV) {
+		err = -EPROBE_DEFER;
+		goto out;
+	}
+	if (err)
+		goto out;
+
+	dev->ethtool_ops = &mv643xx_eth_ethtool_ops;
+
+	init_pscr(mp, pd->speed, pd->duplex);
+
+
+	mib_counters_clear(mp);
+
+	timer_setup(&mp->mib_counters_timer, mib_counters_timer_wrapper, 0);
+	mp->mib_counters_timer.expires = jiffies + 30 * HZ;
+
+	spin_lock_init(&mp->mib_counters_lock);
+
+	INIT_WORK(&mp->tx_timeout_task, tx_timeout_task);
+
+	netif_napi_add(dev, &mp->napi, mv643xx_eth_poll);
+
+	timer_setup(&mp->rx_oom, oom_timer_wrapper, 0);
+
+
+	irq = platform_get_irq(pdev, 0);
+	if (WARN_ON(irq < 0)) {
+		err = irq;
+		goto out;
+	}
+	dev->irq = irq;
+
+	dev->netdev_ops = &mv643xx_eth_netdev_ops;
+
+	dev->watchdog_timeo = 2 * HZ;
+	dev->base_addr = 0;
+
+	dev->features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO;
+	dev->vlan_features = dev->features;
+
+	dev->features |= NETIF_F_RXCSUM;
+	dev->hw_features = dev->features;
+
+	dev->priv_flags |= IFF_UNICAST_FLT;
+	netif_set_tso_max_segs(dev, MV643XX_MAX_TSO_SEGS);
+
+	/* MTU range: 64 - 9500 */
+	dev->min_mtu = 64;
+	dev->max_mtu = 9500;
+
+	if (mp->shared->win_protect)
+		wrl(mp, WINDOW_PROTECT(mp->port_num), mp->shared->win_protect);
+
+	netif_carrier_off(dev);
+
+	wrlp(mp, SDMA_CONFIG, PORT_SDMA_CONFIG_DEFAULT_VALUE);
+
+	set_rx_coal(mp, 250);
+	set_tx_coal(mp, 0);
+
+	err = register_netdev(dev);
+	if (err)
+		goto out;
+
+	netdev_notice(dev, "port %d with MAC address %pM\n",
+		      mp->port_num, dev->dev_addr);
+
+	if (mp->tx_desc_sram_size > 0)
+		netdev_notice(dev, "configured with sram\n");
+
+	return 0;
+
+out:
+	if (!IS_ERR(mp->clk))
+		clk_disable_unprepare(mp->clk);
+	free_netdev(dev);
+
+	return err;
+}
+
+static int mv643xx_eth_remove(struct platform_device *pdev)
+{
+	struct mv643xx_eth_private *mp = platform_get_drvdata(pdev);
+	struct net_device *dev = mp->dev;
+
+	unregister_netdev(mp->dev);
+	if (dev->phydev)
+		phy_disconnect(dev->phydev);
+	cancel_work_sync(&mp->tx_timeout_task);
+
+	if (!IS_ERR(mp->clk))
+		clk_disable_unprepare(mp->clk);
+
+	free_netdev(mp->dev);
+
+	return 0;
+}
+
+static void mv643xx_eth_shutdown(struct platform_device *pdev)
+{
+	struct mv643xx_eth_private *mp = platform_get_drvdata(pdev);
+
+	/* Mask all interrupts on ethernet port */
+	wrlp(mp, INT_MASK, 0);
+	rdlp(mp, INT_MASK);
+
+	if (netif_running(mp->dev))
+		port_reset(mp);
+}
+
+static struct platform_driver mv643xx_eth_driver = {
+	.probe		= mv643xx_eth_probe,
+	.remove		= mv643xx_eth_remove,
+	.shutdown	= mv643xx_eth_shutdown,
+	.driver = {
+		.name	= MV643XX_ETH_NAME,
+	},
+};
+
+static struct platform_driver * const drivers[] = {
+	&mv643xx_eth_shared_driver,
+	&mv643xx_eth_driver,
+};
+
+static int __init mv643xx_eth_init_module(void)
+{
+	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
+}
+module_init(mv643xx_eth_init_module);
+
+static void __exit mv643xx_eth_cleanup_module(void)
+{
+	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
+}
+module_exit(mv643xx_eth_cleanup_module);
+
+MODULE_AUTHOR("Rabeeh Khoury, Assaf Hoffman, Matthew Dharm, "
+	      "Manish Lachwani, Dale Farnsworth and Lennert Buytenhek");
+MODULE_DESCRIPTION("Ethernet driver for Marvell MV643XX");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" MV643XX_ETH_SHARED_NAME);
+MODULE_ALIAS("platform:" MV643XX_ETH_NAME);