Initial import

1 files changed, 1630 insertions, 0 deletions

diff --git a/drivers/net/ethernet/micrel/ks8695net.c b/drivers/net/ethernet/micrel/ks8695net.c
new file mode 100644
index 000000000..a8522d8af
--- /dev/null
+++ b/drivers/net/ethernet/micrel/ks8695net.c
@@ -0,0 +1,1630 @@
+/*
+ * Micrel KS8695 (Centaur) Ethernet.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
+ * General Public License for more details.
+ *
+ * Copyright 2008 Simtec Electronics
+ *		  Daniel Silverstone <dsilvers@simtec.co.uk>
+ *		  Vincent Sanders <vince@simtec.co.uk>
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/interrupt.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/crc32.h>
+#include <linux/mii.h>
+#include <linux/ethtool.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+
+#include <asm/irq.h>
+
+#include <mach/regs-switch.h>
+#include <mach/regs-misc.h>
+#include <asm/mach/irq.h>
+#include <mach/regs-irq.h>
+
+#include "ks8695net.h"
+
+#define MODULENAME	"ks8695_ether"
+#define MODULEVERSION	"1.02"
+
+/*
+ * Transmit and device reset timeout, default 5 seconds.
+ */
+static int watchdog = 5000;
+
+/* Hardware structures */
+
+/**
+ *	struct rx_ring_desc - Receive descriptor ring element
+ *	@status: The status of the descriptor element (E.g. who owns it)
+ *	@length: The number of bytes in the block pointed to by data_ptr
+ *	@data_ptr: The physical address of the data block to receive into
+ *	@next_desc: The physical address of the next descriptor element.
+ */
+struct rx_ring_desc {
+	__le32	status;
+	__le32	length;
+	__le32	data_ptr;
+	__le32	next_desc;
+};
+
+/**
+ *	struct tx_ring_desc - Transmit descriptor ring element
+ *	@owner: Who owns the descriptor
+ *	@status: The number of bytes in the block pointed to by data_ptr
+ *	@data_ptr: The physical address of the data block to receive into
+ *	@next_desc: The physical address of the next descriptor element.
+ */
+struct tx_ring_desc {
+	__le32	owner;
+	__le32	status;
+	__le32	data_ptr;
+	__le32	next_desc;
+};
+
+/**
+ *	struct ks8695_skbuff - sk_buff wrapper for rx/tx rings.
+ *	@skb: The buffer in the ring
+ *	@dma_ptr: The mapped DMA pointer of the buffer
+ *	@length: The number of bytes mapped to dma_ptr
+ */
+struct ks8695_skbuff {
+	struct sk_buff	*skb;
+	dma_addr_t	dma_ptr;
+	u32		length;
+};
+
+/* Private device structure */
+
+#define MAX_TX_DESC 8
+#define MAX_TX_DESC_MASK 0x7
+#define MAX_RX_DESC 16
+#define MAX_RX_DESC_MASK 0xf
+
+/*napi_weight have better more than rx DMA buffers*/
+#define NAPI_WEIGHT   64
+
+#define MAX_RXBUF_SIZE 0x700
+
+#define TX_RING_DMA_SIZE (sizeof(struct tx_ring_desc) * MAX_TX_DESC)
+#define RX_RING_DMA_SIZE (sizeof(struct rx_ring_desc) * MAX_RX_DESC)
+#define RING_DMA_SIZE (TX_RING_DMA_SIZE + RX_RING_DMA_SIZE)
+
+/**
+ *	enum ks8695_dtype - Device type
+ *	@KS8695_DTYPE_WAN: This device is a WAN interface
+ *	@KS8695_DTYPE_LAN: This device is a LAN interface
+ *	@KS8695_DTYPE_HPNA: This device is an HPNA interface
+ */
+enum ks8695_dtype {
+	KS8695_DTYPE_WAN,
+	KS8695_DTYPE_LAN,
+	KS8695_DTYPE_HPNA,
+};
+
+/**
+ *	struct ks8695_priv - Private data for the KS8695 Ethernet
+ *	@in_suspend: Flag to indicate if we're suspending/resuming
+ *	@ndev: The net_device for this interface
+ *	@dev: The platform device object for this interface
+ *	@dtype: The type of this device
+ *	@io_regs: The ioremapped registers for this interface
+ *      @napi : Add support NAPI for Rx
+ *	@rx_irq_name: The textual name of the RX IRQ from the platform data
+ *	@tx_irq_name: The textual name of the TX IRQ from the platform data
+ *	@link_irq_name: The textual name of the link IRQ from the
+ *			platform data if available
+ *	@rx_irq: The IRQ number for the RX IRQ
+ *	@tx_irq: The IRQ number for the TX IRQ
+ *	@link_irq: The IRQ number for the link IRQ if available
+ *	@regs_req: The resource request for the registers region
+ *	@phyiface_req: The resource request for the phy/switch region
+ *		       if available
+ *	@phyiface_regs: The ioremapped registers for the phy/switch if available
+ *	@ring_base: The base pointer of the dma coherent memory for the rings
+ *	@ring_base_dma: The DMA mapped equivalent of ring_base
+ *	@tx_ring: The pointer in ring_base of the TX ring
+ *	@tx_ring_used: The number of slots in the TX ring which are occupied
+ *	@tx_ring_next_slot: The next slot to fill in the TX ring
+ *	@tx_ring_dma: The DMA mapped equivalent of tx_ring
+ *	@tx_buffers: The sk_buff mappings for the TX ring
+ *	@txq_lock: A lock to protect the tx_buffers tx_ring_used etc variables
+ *	@rx_ring: The pointer in ring_base of the RX ring
+ *	@rx_ring_dma: The DMA mapped equivalent of rx_ring
+ *	@rx_buffers: The sk_buff mappings for the RX ring
+ *	@next_rx_desc_read: The next RX descriptor to read from on IRQ
+ *      @rx_lock: A lock to protect Rx irq function
+ *	@msg_enable: The flags for which messages to emit
+ */
+struct ks8695_priv {
+	int in_suspend;
+	struct net_device *ndev;
+	struct device *dev;
+	enum ks8695_dtype dtype;
+	void __iomem *io_regs;
+
+	struct napi_struct	napi;
+
+	const char *rx_irq_name, *tx_irq_name, *link_irq_name;
+	int rx_irq, tx_irq, link_irq;
+
+	struct resource *regs_req, *phyiface_req;
+	void __iomem *phyiface_regs;
+
+	void *ring_base;
+	dma_addr_t ring_base_dma;
+
+	struct tx_ring_desc *tx_ring;
+	int tx_ring_used;
+	int tx_ring_next_slot;
+	dma_addr_t tx_ring_dma;
+	struct ks8695_skbuff tx_buffers[MAX_TX_DESC];
+	spinlock_t txq_lock;
+
+	struct rx_ring_desc *rx_ring;
+	dma_addr_t rx_ring_dma;
+	struct ks8695_skbuff rx_buffers[MAX_RX_DESC];
+	int next_rx_desc_read;
+	spinlock_t rx_lock;
+
+	int msg_enable;
+};
+
+/* Register access */
+
+/**
+ *	ks8695_readreg - Read from a KS8695 ethernet register
+ *	@ksp: The device to read from
+ *	@reg: The register to read
+ */
+static inline u32
+ks8695_readreg(struct ks8695_priv *ksp, int reg)
+{
+	return readl(ksp->io_regs + reg);
+}
+
+/**
+ *	ks8695_writereg - Write to a KS8695 ethernet register
+ *	@ksp: The device to write to
+ *	@reg: The register to write
+ *	@value: The value to write to the register
+ */
+static inline void
+ks8695_writereg(struct ks8695_priv *ksp, int reg, u32 value)
+{
+	writel(value, ksp->io_regs + reg);
+}
+
+/* Utility functions */
+
+/**
+ *	ks8695_port_type - Retrieve port-type as user-friendly string
+ *	@ksp: The device to return the type for
+ *
+ *	Returns a string indicating which of the WAN, LAN or HPNA
+ *	ports this device is likely to represent.
+ */
+static const char *
+ks8695_port_type(struct ks8695_priv *ksp)
+{
+	switch (ksp->dtype) {
+	case KS8695_DTYPE_LAN:
+		return "LAN";
+	case KS8695_DTYPE_WAN:
+		return "WAN";
+	case KS8695_DTYPE_HPNA:
+		return "HPNA";
+	}
+
+	return "UNKNOWN";
+}
+
+/**
+ *	ks8695_update_mac - Update the MAC registers in the device
+ *	@ksp: The device to update
+ *
+ *	Updates the MAC registers in the KS8695 device from the address in the
+ *	net_device structure associated with this interface.
+ */
+static void
+ks8695_update_mac(struct ks8695_priv *ksp)
+{
+	/* Update the HW with the MAC from the net_device */
+	struct net_device *ndev = ksp->ndev;
+	u32 machigh, maclow;
+
+	maclow	= ((ndev->dev_addr[2] << 24) | (ndev->dev_addr[3] << 16) |
+		   (ndev->dev_addr[4] <<  8) | (ndev->dev_addr[5] <<  0));
+	machigh = ((ndev->dev_addr[0] <<  8) | (ndev->dev_addr[1] <<  0));
+
+	ks8695_writereg(ksp, KS8695_MAL, maclow);
+	ks8695_writereg(ksp, KS8695_MAH, machigh);
+
+}
+
+/**
+ *	ks8695_refill_rxbuffers - Re-fill the RX buffer ring
+ *	@ksp: The device to refill
+ *
+ *	Iterates the RX ring of the device looking for empty slots.
+ *	For each empty slot, we allocate and map a new SKB and give it
+ *	to the hardware.
+ *	This can be called from interrupt context safely.
+ */
+static void
+ks8695_refill_rxbuffers(struct ks8695_priv *ksp)
+{
+	/* Run around the RX ring, filling in any missing sk_buff's */
+	int buff_n;
+
+	for (buff_n = 0; buff_n < MAX_RX_DESC; ++buff_n) {
+		if (!ksp->rx_buffers[buff_n].skb) {
+			struct sk_buff *skb =
+				netdev_alloc_skb(ksp->ndev, MAX_RXBUF_SIZE);
+			dma_addr_t mapping;
+
+			ksp->rx_buffers[buff_n].skb = skb;
+			if (skb == NULL) {
+				/* Failed to allocate one, perhaps
+				 * we'll try again later.
+				 */
+				break;
+			}
+
+			mapping = dma_map_single(ksp->dev, skb->data,
+						 MAX_RXBUF_SIZE,
+						 DMA_FROM_DEVICE);
+			if (unlikely(dma_mapping_error(ksp->dev, mapping))) {
+				/* Failed to DMA map this SKB, try later */
+				dev_kfree_skb_irq(skb);
+				ksp->rx_buffers[buff_n].skb = NULL;
+				break;
+			}
+			ksp->rx_buffers[buff_n].dma_ptr = mapping;
+			ksp->rx_buffers[buff_n].length = MAX_RXBUF_SIZE;
+
+			/* Record this into the DMA ring */
+			ksp->rx_ring[buff_n].data_ptr = cpu_to_le32(mapping);
+			ksp->rx_ring[buff_n].length =
+				cpu_to_le32(MAX_RXBUF_SIZE);
+
+			wmb();
+
+			/* And give ownership over to the hardware */
+			ksp->rx_ring[buff_n].status = cpu_to_le32(RDES_OWN);
+		}
+	}
+}
+
+/* Maximum number of multicast addresses which the KS8695 HW supports */
+#define KS8695_NR_ADDRESSES	16
+
+/**
+ *	ks8695_init_partial_multicast - Init the mcast addr registers
+ *	@ksp: The device to initialise
+ *	@addr: The multicast address list to use
+ *	@nr_addr: The number of addresses in the list
+ *
+ *	This routine is a helper for ks8695_set_multicast - it writes
+ *	the additional-address registers in the KS8695 ethernet device
+ *	and cleans up any others left behind.
+ */
+static void
+ks8695_init_partial_multicast(struct ks8695_priv *ksp,
+			      struct net_device *ndev)
+{
+	u32 low, high;
+	int i;
+	struct netdev_hw_addr *ha;
+
+	i = 0;
+	netdev_for_each_mc_addr(ha, ndev) {
+		/* Ran out of space in chip? */
+		BUG_ON(i == KS8695_NR_ADDRESSES);
+
+		low = (ha->addr[2] << 24) | (ha->addr[3] << 16) |
+		      (ha->addr[4] << 8) | (ha->addr[5]);
+		high = (ha->addr[0] << 8) | (ha->addr[1]);
+
+		ks8695_writereg(ksp, KS8695_AAL_(i), low);
+		ks8695_writereg(ksp, KS8695_AAH_(i), AAH_E | high);
+		i++;
+	}
+
+	/* Clear the remaining Additional Station Addresses */
+	for (; i < KS8695_NR_ADDRESSES; i++) {
+		ks8695_writereg(ksp, KS8695_AAL_(i), 0);
+		ks8695_writereg(ksp, KS8695_AAH_(i), 0);
+	}
+}
+
+/* Interrupt handling */
+
+/**
+ *	ks8695_tx_irq - Transmit IRQ handler
+ *	@irq: The IRQ which went off (ignored)
+ *	@dev_id: The net_device for the interrupt
+ *
+ *	Process the TX ring, clearing out any transmitted slots.
+ *	Allows the net_device to pass us new packets once slots are
+ *	freed.
+ */
+static irqreturn_t
+ks8695_tx_irq(int irq, void *dev_id)
+{
+	struct net_device *ndev = (struct net_device *)dev_id;
+	struct ks8695_priv *ksp = netdev_priv(ndev);
+	int buff_n;
+
+	for (buff_n = 0; buff_n < MAX_TX_DESC; ++buff_n) {
+		if (ksp->tx_buffers[buff_n].skb &&
+		    !(ksp->tx_ring[buff_n].owner & cpu_to_le32(TDES_OWN))) {
+			rmb();
+			/* An SKB which is not owned by HW is present */
+			/* Update the stats for the net_device */
+			ndev->stats.tx_packets++;
+			ndev->stats.tx_bytes += ksp->tx_buffers[buff_n].length;
+
+			/* Free the packet from the ring */
+			ksp->tx_ring[buff_n].data_ptr = 0;
+
+			/* Free the sk_buff */
+			dma_unmap_single(ksp->dev,
+					 ksp->tx_buffers[buff_n].dma_ptr,
+					 ksp->tx_buffers[buff_n].length,
+					 DMA_TO_DEVICE);
+			dev_kfree_skb_irq(ksp->tx_buffers[buff_n].skb);
+			ksp->tx_buffers[buff_n].skb = NULL;
+			ksp->tx_ring_used--;
+		}
+	}
+
+	netif_wake_queue(ndev);
+
+	return IRQ_HANDLED;
+}
+
+/**
+ *	ks8695_get_rx_enable_bit - Get rx interrupt enable/status bit
+ *	@ksp: Private data for the KS8695 Ethernet
+ *
+ *    For KS8695 document:
+ *    Interrupt Enable Register (offset 0xE204)
+ *        Bit29 : WAN MAC Receive Interrupt Enable
+ *        Bit16 : LAN MAC Receive Interrupt Enable
+ *    Interrupt Status Register (Offset 0xF208)
+ *        Bit29: WAN MAC Receive Status
+ *        Bit16: LAN MAC Receive Status
+ *    So, this Rx interrupt enable/status bit number is equal
+ *    as Rx IRQ number.
+ */
+static inline u32 ks8695_get_rx_enable_bit(struct ks8695_priv *ksp)
+{
+	return ksp->rx_irq;
+}
+
+/**
+ *	ks8695_rx_irq - Receive IRQ handler
+ *	@irq: The IRQ which went off (ignored)
+ *	@dev_id: The net_device for the interrupt
+ *
+ *	Inform NAPI that packet reception needs to be scheduled
+ */
+
+static irqreturn_t
+ks8695_rx_irq(int irq, void *dev_id)
+{
+	struct net_device *ndev = (struct net_device *)dev_id;
+	struct ks8695_priv *ksp = netdev_priv(ndev);
+
+	spin_lock(&ksp->rx_lock);
+
+	if (napi_schedule_prep(&ksp->napi)) {
+		unsigned long status = readl(KS8695_IRQ_VA + KS8695_INTEN);
+		unsigned long mask_bit = 1 << ks8695_get_rx_enable_bit(ksp);
+		/*disable rx interrupt*/
+		status &= ~mask_bit;
+		writel(status , KS8695_IRQ_VA + KS8695_INTEN);
+		__napi_schedule(&ksp->napi);
+	}
+
+	spin_unlock(&ksp->rx_lock);
+	return IRQ_HANDLED;
+}
+
+/**
+ *	ks8695_rx - Receive packets called by NAPI poll method
+ *	@ksp: Private data for the KS8695 Ethernet
+ *	@budget: Number of packets allowed to process
+ */
+static int ks8695_rx(struct ks8695_priv *ksp, int budget)
+{
+	struct net_device *ndev = ksp->ndev;
+	struct sk_buff *skb;
+	int buff_n;
+	u32 flags;
+	int pktlen;
+	int received = 0;
+
+	buff_n = ksp->next_rx_desc_read;
+	while (received < budget
+			&& ksp->rx_buffers[buff_n].skb
+			&& (!(ksp->rx_ring[buff_n].status &
+					cpu_to_le32(RDES_OWN)))) {
+			rmb();
+			flags = le32_to_cpu(ksp->rx_ring[buff_n].status);
+
+			/* Found an SKB which we own, this means we
+			 * received a packet
+			 */
+			if ((flags & (RDES_FS | RDES_LS)) !=
+			    (RDES_FS | RDES_LS)) {
+				/* This packet is not the first and
+				 * the last segment.  Therefore it is
+				 * a "spanning" packet and we can't
+				 * handle it
+				 */
+				goto rx_failure;
+			}
+
+			if (flags & (RDES_ES | RDES_RE)) {
+				/* It's an error packet */
+				ndev->stats.rx_errors++;
+				if (flags & RDES_TL)
+					ndev->stats.rx_length_errors++;
+				if (flags & RDES_RF)
+					ndev->stats.rx_length_errors++;
+				if (flags & RDES_CE)
+					ndev->stats.rx_crc_errors++;
+				if (flags & RDES_RE)
+					ndev->stats.rx_missed_errors++;
+
+				goto rx_failure;
+			}
+
+			pktlen = flags & RDES_FLEN;
+			pktlen -= 4; /* Drop the CRC */
+
+			/* Retrieve the sk_buff */
+			skb = ksp->rx_buffers[buff_n].skb;
+
+			/* Clear it from the ring */
+			ksp->rx_buffers[buff_n].skb = NULL;
+			ksp->rx_ring[buff_n].data_ptr = 0;
+
+			/* Unmap the SKB */
+			dma_unmap_single(ksp->dev,
+					 ksp->rx_buffers[buff_n].dma_ptr,
+					 ksp->rx_buffers[buff_n].length,
+					 DMA_FROM_DEVICE);
+
+			/* Relinquish the SKB to the network layer */
+			skb_put(skb, pktlen);
+			skb->protocol = eth_type_trans(skb, ndev);
+			netif_receive_skb(skb);
+
+			/* Record stats */
+			ndev->stats.rx_packets++;
+			ndev->stats.rx_bytes += pktlen;
+			goto rx_finished;
+
+rx_failure:
+			/* This ring entry is an error, but we can
+			 * re-use the skb
+			 */
+			/* Give the ring entry back to the hardware */
+			ksp->rx_ring[buff_n].status = cpu_to_le32(RDES_OWN);
+rx_finished:
+			received++;
+			buff_n = (buff_n + 1) & MAX_RX_DESC_MASK;
+	}
+
+	/* And note which RX descriptor we last did */
+	ksp->next_rx_desc_read = buff_n;
+
+	/* And refill the buffers */
+	ks8695_refill_rxbuffers(ksp);
+
+	/* Kick the RX DMA engine, in case it became suspended */
+	ks8695_writereg(ksp, KS8695_DRSC, 0);
+
+	return received;
+}
+
+
+/**
+ *	ks8695_poll - Receive packet by NAPI poll method
+ *	@ksp: Private data for the KS8695 Ethernet
+ *	@budget: The remaining number packets for network subsystem
+ *
+ *     Invoked by the network core when it requests for new
+ *     packets from the driver
+ */
+static int ks8695_poll(struct napi_struct *napi, int budget)
+{
+	struct ks8695_priv *ksp = container_of(napi, struct ks8695_priv, napi);
+	unsigned long  work_done;
+
+	unsigned long isr = readl(KS8695_IRQ_VA + KS8695_INTEN);
+	unsigned long mask_bit = 1 << ks8695_get_rx_enable_bit(ksp);
+
+	work_done = ks8695_rx(ksp, budget);
+
+	if (work_done < budget) {
+		unsigned long flags;
+		spin_lock_irqsave(&ksp->rx_lock, flags);
+		__napi_complete(napi);
+		/*enable rx interrupt*/
+		writel(isr | mask_bit, KS8695_IRQ_VA + KS8695_INTEN);
+		spin_unlock_irqrestore(&ksp->rx_lock, flags);
+	}
+	return work_done;
+}
+
+/**
+ *	ks8695_link_irq - Link change IRQ handler
+ *	@irq: The IRQ which went off (ignored)
+ *	@dev_id: The net_device for the interrupt
+ *
+ *	The WAN interface can generate an IRQ when the link changes,
+ *	report this to the net layer and the user.
+ */
+static irqreturn_t
+ks8695_link_irq(int irq, void *dev_id)
+{
+	struct net_device *ndev = (struct net_device *)dev_id;
+	struct ks8695_priv *ksp = netdev_priv(ndev);
+	u32 ctrl;
+
+	ctrl = readl(ksp->phyiface_regs + KS8695_WMC);
+	if (ctrl & WMC_WLS) {
+		netif_carrier_on(ndev);
+		if (netif_msg_link(ksp))
+			dev_info(ksp->dev,
+				 "%s: Link is now up (10%sMbps/%s-duplex)\n",
+				 ndev->name,
+				 (ctrl & WMC_WSS) ? "0" : "",
+				 (ctrl & WMC_WDS) ? "Full" : "Half");
+	} else {
+		netif_carrier_off(ndev);
+		if (netif_msg_link(ksp))
+			dev_info(ksp->dev, "%s: Link is now down.\n",
+				 ndev->name);
+	}
+
+	return IRQ_HANDLED;
+}
+
+
+/* KS8695 Device functions */
+
+/**
+ *	ks8695_reset - Reset a KS8695 ethernet interface
+ *	@ksp: The interface to reset
+ *
+ *	Perform an engine reset of the interface and re-program it
+ *	with sensible defaults.
+ */
+static void
+ks8695_reset(struct ks8695_priv *ksp)
+{
+	int reset_timeout = watchdog;
+	/* Issue the reset via the TX DMA control register */
+	ks8695_writereg(ksp, KS8695_DTXC, DTXC_TRST);
+	while (reset_timeout--) {
+		if (!(ks8695_readreg(ksp, KS8695_DTXC) & DTXC_TRST))
+			break;
+		msleep(1);
+	}
+
+	if (reset_timeout < 0) {
+		dev_crit(ksp->dev,
+			 "Timeout waiting for DMA engines to reset\n");
+		/* And blithely carry on */
+	}
+
+	/* Definitely wait long enough before attempting to program
+	 * the engines
+	 */
+	msleep(10);
+
+	/* RX: unicast and broadcast */
+	ks8695_writereg(ksp, KS8695_DRXC, DRXC_RU | DRXC_RB);
+	/* TX: pad and add CRC */
+	ks8695_writereg(ksp, KS8695_DTXC, DTXC_TEP | DTXC_TAC);
+}
+
+/**
+ *	ks8695_shutdown - Shut down a KS8695 ethernet interface
+ *	@ksp: The interface to shut down
+ *
+ *	This disables packet RX/TX, cleans up IRQs, drains the rings,
+ *	and basically places the interface into a clean shutdown
+ *	state.
+ */
+static void
+ks8695_shutdown(struct ks8695_priv *ksp)
+{
+	u32 ctrl;
+	int buff_n;
+
+	/* Disable packet transmission */
+	ctrl = ks8695_readreg(ksp, KS8695_DTXC);
+	ks8695_writereg(ksp, KS8695_DTXC, ctrl & ~DTXC_TE);
+
+	/* Disable packet reception */
+	ctrl = ks8695_readreg(ksp, KS8695_DRXC);
+	ks8695_writereg(ksp, KS8695_DRXC, ctrl & ~DRXC_RE);
+
+	/* Release the IRQs */
+	free_irq(ksp->rx_irq, ksp->ndev);
+	free_irq(ksp->tx_irq, ksp->ndev);
+	if (ksp->link_irq != -1)
+		free_irq(ksp->link_irq, ksp->ndev);
+
+	/* Throw away any pending TX packets */
+	for (buff_n = 0; buff_n < MAX_TX_DESC; ++buff_n) {
+		if (ksp->tx_buffers[buff_n].skb) {
+			/* Remove this SKB from the TX ring */
+			ksp->tx_ring[buff_n].owner = 0;
+			ksp->tx_ring[buff_n].status = 0;
+			ksp->tx_ring[buff_n].data_ptr = 0;
+
+			/* Unmap and bin this SKB */
+			dma_unmap_single(ksp->dev,
+					 ksp->tx_buffers[buff_n].dma_ptr,
+					 ksp->tx_buffers[buff_n].length,
+					 DMA_TO_DEVICE);
+			dev_kfree_skb_irq(ksp->tx_buffers[buff_n].skb);
+			ksp->tx_buffers[buff_n].skb = NULL;
+		}
+	}
+
+	/* Purge the RX buffers */
+	for (buff_n = 0; buff_n < MAX_RX_DESC; ++buff_n) {
+		if (ksp->rx_buffers[buff_n].skb) {
+			/* Remove the SKB from the RX ring */
+			ksp->rx_ring[buff_n].status = 0;
+			ksp->rx_ring[buff_n].data_ptr = 0;
+
+			/* Unmap and bin the SKB */
+			dma_unmap_single(ksp->dev,
+					 ksp->rx_buffers[buff_n].dma_ptr,
+					 ksp->rx_buffers[buff_n].length,
+					 DMA_FROM_DEVICE);
+			dev_kfree_skb_irq(ksp->rx_buffers[buff_n].skb);
+			ksp->rx_buffers[buff_n].skb = NULL;
+		}
+	}
+}
+
+
+/**
+ *	ks8695_setup_irq - IRQ setup helper function
+ *	@irq: The IRQ number to claim
+ *	@irq_name: The name to give the IRQ claimant
+ *	@handler: The function to call to handle the IRQ
+ *	@ndev: The net_device to pass in as the dev_id argument to the handler
+ *
+ *	Return 0 on success.
+ */
+static int
+ks8695_setup_irq(int irq, const char *irq_name,
+		 irq_handler_t handler, struct net_device *ndev)
+{
+	int ret;
+
+	ret = request_irq(irq, handler, IRQF_SHARED, irq_name, ndev);
+
+	if (ret) {
+		dev_err(&ndev->dev, "failure to request IRQ %d\n", irq);
+		return ret;
+	}
+
+	return 0;
+}
+
+/**
+ *	ks8695_init_net - Initialise a KS8695 ethernet interface
+ *	@ksp: The interface to initialise
+ *
+ *	This routine fills the RX ring, initialises the DMA engines,
+ *	allocates the IRQs and then starts the packet TX and RX
+ *	engines.
+ */
+static int
+ks8695_init_net(struct ks8695_priv *ksp)
+{
+	int ret;
+	u32 ctrl;
+
+	ks8695_refill_rxbuffers(ksp);
+
+	/* Initialise the DMA engines */
+	ks8695_writereg(ksp, KS8695_RDLB, (u32) ksp->rx_ring_dma);
+	ks8695_writereg(ksp, KS8695_TDLB, (u32) ksp->tx_ring_dma);
+
+	/* Request the IRQs */
+	ret = ks8695_setup_irq(ksp->rx_irq, ksp->rx_irq_name,
+			       ks8695_rx_irq, ksp->ndev);
+	if (ret)
+		return ret;
+	ret = ks8695_setup_irq(ksp->tx_irq, ksp->tx_irq_name,
+			       ks8695_tx_irq, ksp->ndev);
+	if (ret)
+		return ret;
+	if (ksp->link_irq != -1) {
+		ret = ks8695_setup_irq(ksp->link_irq, ksp->link_irq_name,
+				       ks8695_link_irq, ksp->ndev);
+		if (ret)
+			return ret;
+	}
+
+	/* Set up the ring indices */
+	ksp->next_rx_desc_read = 0;
+	ksp->tx_ring_next_slot = 0;
+	ksp->tx_ring_used = 0;
+
+	/* Bring up transmission */
+	ctrl = ks8695_readreg(ksp, KS8695_DTXC);
+	/* Enable packet transmission */
+	ks8695_writereg(ksp, KS8695_DTXC, ctrl | DTXC_TE);
+
+	/* Bring up the reception */
+	ctrl = ks8695_readreg(ksp, KS8695_DRXC);
+	/* Enable packet reception */
+	ks8695_writereg(ksp, KS8695_DRXC, ctrl | DRXC_RE);
+	/* And start the DMA engine */
+	ks8695_writereg(ksp, KS8695_DRSC, 0);
+
+	/* All done */
+	return 0;
+}
+
+/**
+ *	ks8695_release_device - HW resource release for KS8695 e-net
+ *	@ksp: The device to be freed
+ *
+ *	This unallocates io memory regions, dma-coherent regions etc
+ *	which were allocated in ks8695_probe.
+ */
+static void
+ks8695_release_device(struct ks8695_priv *ksp)
+{
+	/* Unmap the registers */
+	iounmap(ksp->io_regs);
+	if (ksp->phyiface_regs)
+		iounmap(ksp->phyiface_regs);
+
+	/* And release the request */
+	release_resource(ksp->regs_req);
+	kfree(ksp->regs_req);
+	if (ksp->phyiface_req) {
+		release_resource(ksp->phyiface_req);
+		kfree(ksp->phyiface_req);
+	}
+
+	/* Free the ring buffers */
+	dma_free_coherent(ksp->dev, RING_DMA_SIZE,
+			  ksp->ring_base, ksp->ring_base_dma);
+}
+
+/* Ethtool support */
+
+/**
+ *	ks8695_get_msglevel - Get the messages enabled for emission
+ *	@ndev: The network device to read from
+ */
+static u32
+ks8695_get_msglevel(struct net_device *ndev)
+{
+	struct ks8695_priv *ksp = netdev_priv(ndev);
+
+	return ksp->msg_enable;
+}
+
+/**
+ *	ks8695_set_msglevel - Set the messages enabled for emission
+ *	@ndev: The network device to configure
+ *	@value: The messages to set for emission
+ */
+static void
+ks8695_set_msglevel(struct net_device *ndev, u32 value)
+{
+	struct ks8695_priv *ksp = netdev_priv(ndev);
+
+	ksp->msg_enable = value;
+}
+
+/**
+ *	ks8695_wan_get_settings - Get device-specific settings.
+ *	@ndev: The network device to read settings from
+ *	@cmd: The ethtool structure to read into
+ */
+static int
+ks8695_wan_get_settings(struct net_device *ndev, struct ethtool_cmd *cmd)
+{
+	struct ks8695_priv *ksp = netdev_priv(ndev);
+	u32 ctrl;
+
+	/* All ports on the KS8695 support these... */
+	cmd->supported = (SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full |
+			  SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full |
+			  SUPPORTED_TP | SUPPORTED_MII);
+	cmd->transceiver = XCVR_INTERNAL;
+
+	cmd->advertising = ADVERTISED_TP | ADVERTISED_MII;
+	cmd->port = PORT_MII;
+	cmd->supported |= (SUPPORTED_Autoneg | SUPPORTED_Pause);
+	cmd->phy_address = 0;
+
+	ctrl = readl(ksp->phyiface_regs + KS8695_WMC);
+	if ((ctrl & WMC_WAND) == 0) {
+		/* auto-negotiation is enabled */
+		cmd->advertising |= ADVERTISED_Autoneg;
+		if (ctrl & WMC_WANA100F)
+			cmd->advertising |= ADVERTISED_100baseT_Full;
+		if (ctrl & WMC_WANA100H)
+			cmd->advertising |= ADVERTISED_100baseT_Half;
+		if (ctrl & WMC_WANA10F)
+			cmd->advertising |= ADVERTISED_10baseT_Full;
+		if (ctrl & WMC_WANA10H)
+			cmd->advertising |= ADVERTISED_10baseT_Half;
+		if (ctrl & WMC_WANAP)
+			cmd->advertising |= ADVERTISED_Pause;
+		cmd->autoneg = AUTONEG_ENABLE;
+
+		ethtool_cmd_speed_set(cmd,
+				      (ctrl & WMC_WSS) ? SPEED_100 : SPEED_10);
+		cmd->duplex = (ctrl & WMC_WDS) ?
+			DUPLEX_FULL : DUPLEX_HALF;
+	} else {
+		/* auto-negotiation is disabled */
+		cmd->autoneg = AUTONEG_DISABLE;
+
+		ethtool_cmd_speed_set(cmd, ((ctrl & WMC_WANF100) ?
+					    SPEED_100 : SPEED_10));
+		cmd->duplex = (ctrl & WMC_WANFF) ?
+			DUPLEX_FULL : DUPLEX_HALF;
+	}
+
+	return 0;
+}
+
+/**
+ *	ks8695_wan_set_settings - Set device-specific settings.
+ *	@ndev: The network device to configure
+ *	@cmd: The settings to configure
+ */
+static int
+ks8695_wan_set_settings(struct net_device *ndev, struct ethtool_cmd *cmd)
+{
+	struct ks8695_priv *ksp = netdev_priv(ndev);
+	u32 ctrl;
+
+	if ((cmd->speed != SPEED_10) && (cmd->speed != SPEED_100))
+		return -EINVAL;
+	if ((cmd->duplex != DUPLEX_HALF) && (cmd->duplex != DUPLEX_FULL))
+		return -EINVAL;
+	if (cmd->port != PORT_MII)
+		return -EINVAL;
+	if (cmd->transceiver != XCVR_INTERNAL)
+		return -EINVAL;
+	if ((cmd->autoneg != AUTONEG_DISABLE) &&
+	    (cmd->autoneg != AUTONEG_ENABLE))
+		return -EINVAL;
+
+	if (cmd->autoneg == AUTONEG_ENABLE) {
+		if ((cmd->advertising & (ADVERTISED_10baseT_Half |
+				ADVERTISED_10baseT_Full |
+				ADVERTISED_100baseT_Half |
+				ADVERTISED_100baseT_Full)) == 0)
+			return -EINVAL;
+
+		ctrl = readl(ksp->phyiface_regs + KS8695_WMC);
+
+		ctrl &= ~(WMC_WAND | WMC_WANA100F | WMC_WANA100H |
+			  WMC_WANA10F | WMC_WANA10H);
+		if (cmd->advertising & ADVERTISED_100baseT_Full)
+			ctrl |= WMC_WANA100F;
+		if (cmd->advertising & ADVERTISED_100baseT_Half)
+			ctrl |= WMC_WANA100H;
+		if (cmd->advertising & ADVERTISED_10baseT_Full)
+			ctrl |= WMC_WANA10F;
+		if (cmd->advertising & ADVERTISED_10baseT_Half)
+			ctrl |= WMC_WANA10H;
+
+		/* force a re-negotiation */
+		ctrl |= WMC_WANR;
+		writel(ctrl, ksp->phyiface_regs + KS8695_WMC);
+	} else {
+		ctrl = readl(ksp->phyiface_regs + KS8695_WMC);
+
+		/* disable auto-negotiation */
+		ctrl |= WMC_WAND;
+		ctrl &= ~(WMC_WANF100 | WMC_WANFF);
+
+		if (cmd->speed == SPEED_100)
+			ctrl |= WMC_WANF100;
+		if (cmd->duplex == DUPLEX_FULL)
+			ctrl |= WMC_WANFF;
+
+		writel(ctrl, ksp->phyiface_regs + KS8695_WMC);
+	}
+
+	return 0;
+}
+
+/**
+ *	ks8695_wan_nwayreset - Restart the autonegotiation on the port.
+ *	@ndev: The network device to restart autoneotiation on
+ */
+static int
+ks8695_wan_nwayreset(struct net_device *ndev)
+{
+	struct ks8695_priv *ksp = netdev_priv(ndev);
+	u32 ctrl;
+
+	ctrl = readl(ksp->phyiface_regs + KS8695_WMC);
+
+	if ((ctrl & WMC_WAND) == 0)
+		writel(ctrl | WMC_WANR,
+		       ksp->phyiface_regs + KS8695_WMC);
+	else
+		/* auto-negotiation not enabled */
+		return -EINVAL;
+
+	return 0;
+}
+
+/**
+ *	ks8695_wan_get_pause - Retrieve network pause/flow-control advertising
+ *	@ndev: The device to retrieve settings from
+ *	@param: The structure to fill out with the information
+ */
+static void
+ks8695_wan_get_pause(struct net_device *ndev, struct ethtool_pauseparam *param)
+{
+	struct ks8695_priv *ksp = netdev_priv(ndev);
+	u32 ctrl;
+
+	ctrl = readl(ksp->phyiface_regs + KS8695_WMC);
+
+	/* advertise Pause */
+	param->autoneg = (ctrl & WMC_WANAP);
+
+	/* current Rx Flow-control */
+	ctrl = ks8695_readreg(ksp, KS8695_DRXC);
+	param->rx_pause = (ctrl & DRXC_RFCE);
+
+	/* current Tx Flow-control */
+	ctrl = ks8695_readreg(ksp, KS8695_DTXC);
+	param->tx_pause = (ctrl & DTXC_TFCE);
+}
+
+/**
+ *	ks8695_get_drvinfo - Retrieve driver information
+ *	@ndev: The network device to retrieve info about
+ *	@info: The info structure to fill out.
+ */
+static void
+ks8695_get_drvinfo(struct net_device *ndev, struct ethtool_drvinfo *info)
+{
+	strlcpy(info->driver, MODULENAME, sizeof(info->driver));
+	strlcpy(info->version, MODULEVERSION, sizeof(info->version));
+	strlcpy(info->bus_info, dev_name(ndev->dev.parent),
+		sizeof(info->bus_info));
+}
+
+static const struct ethtool_ops ks8695_ethtool_ops = {
+	.get_msglevel	= ks8695_get_msglevel,
+	.set_msglevel	= ks8695_set_msglevel,
+	.get_drvinfo	= ks8695_get_drvinfo,
+};
+
+static const struct ethtool_ops ks8695_wan_ethtool_ops = {
+	.get_msglevel	= ks8695_get_msglevel,
+	.set_msglevel	= ks8695_set_msglevel,
+	.get_settings	= ks8695_wan_get_settings,
+	.set_settings	= ks8695_wan_set_settings,
+	.nway_reset	= ks8695_wan_nwayreset,
+	.get_link	= ethtool_op_get_link,
+	.get_pauseparam = ks8695_wan_get_pause,
+	.get_drvinfo	= ks8695_get_drvinfo,
+};
+
+/* Network device interface functions */
+
+/**
+ *	ks8695_set_mac - Update MAC in net dev and HW
+ *	@ndev: The network device to update
+ *	@addr: The new MAC address to set
+ */
+static int
+ks8695_set_mac(struct net_device *ndev, void *addr)
+{
+	struct ks8695_priv *ksp = netdev_priv(ndev);
+	struct sockaddr *address = addr;
+
+	if (!is_valid_ether_addr(address->sa_data))
+		return -EADDRNOTAVAIL;
+
+	memcpy(ndev->dev_addr, address->sa_data, ndev->addr_len);
+
+	ks8695_update_mac(ksp);
+
+	dev_dbg(ksp->dev, "%s: Updated MAC address to %pM\n",
+		ndev->name, ndev->dev_addr);
+
+	return 0;
+}
+
+/**
+ *	ks8695_set_multicast - Set up the multicast behaviour of the interface
+ *	@ndev: The net_device to configure
+ *
+ *	This routine, called by the net layer, configures promiscuity
+ *	and multicast reception behaviour for the interface.
+ */
+static void
+ks8695_set_multicast(struct net_device *ndev)
+{
+	struct ks8695_priv *ksp = netdev_priv(ndev);
+	u32 ctrl;
+
+	ctrl = ks8695_readreg(ksp, KS8695_DRXC);
+
+	if (ndev->flags & IFF_PROMISC) {
+		/* enable promiscuous mode */
+		ctrl |= DRXC_RA;
+	} else if (ndev->flags & ~IFF_PROMISC) {
+		/* disable promiscuous mode */
+		ctrl &= ~DRXC_RA;
+	}
+
+	if (ndev->flags & IFF_ALLMULTI) {
+		/* enable all multicast mode */
+		ctrl |= DRXC_RM;
+	} else if (netdev_mc_count(ndev) > KS8695_NR_ADDRESSES) {
+		/* more specific multicast addresses than can be
+		 * handled in hardware
+		 */
+		ctrl |= DRXC_RM;
+	} else {
+		/* enable specific multicasts */
+		ctrl &= ~DRXC_RM;
+		ks8695_init_partial_multicast(ksp, ndev);
+	}
+
+	ks8695_writereg(ksp, KS8695_DRXC, ctrl);
+}
+
+/**
+ *	ks8695_timeout - Handle a network tx/rx timeout.
+ *	@ndev: The net_device which timed out.
+ *
+ *	A network transaction timed out, reset the device.
+ */
+static void
+ks8695_timeout(struct net_device *ndev)
+{
+	struct ks8695_priv *ksp = netdev_priv(ndev);
+
+	netif_stop_queue(ndev);
+	ks8695_shutdown(ksp);
+
+	ks8695_reset(ksp);
+
+	ks8695_update_mac(ksp);
+
+	/* We ignore the return from this since it managed to init
+	 * before it probably will be okay to init again.
+	 */
+	ks8695_init_net(ksp);
+
+	/* Reconfigure promiscuity etc */
+	ks8695_set_multicast(ndev);
+
+	/* And start the TX queue once more */
+	netif_start_queue(ndev);
+}
+
+/**
+ *	ks8695_start_xmit - Start a packet transmission
+ *	@skb: The packet to transmit
+ *	@ndev: The network device to send the packet on
+ *
+ *	This routine, called by the net layer, takes ownership of the
+ *	sk_buff and adds it to the TX ring. It then kicks the TX DMA
+ *	engine to ensure transmission begins.
+ */
+static int
+ks8695_start_xmit(struct sk_buff *skb, struct net_device *ndev)
+{
+	struct ks8695_priv *ksp = netdev_priv(ndev);
+	int buff_n;
+	dma_addr_t dmap;
+
+	spin_lock_irq(&ksp->txq_lock);
+
+	if (ksp->tx_ring_used == MAX_TX_DESC) {
+		/* Somehow we got entered when we have no room */
+		spin_unlock_irq(&ksp->txq_lock);
+		return NETDEV_TX_BUSY;
+	}
+
+	buff_n = ksp->tx_ring_next_slot;
+
+	BUG_ON(ksp->tx_buffers[buff_n].skb);
+
+	dmap = dma_map_single(ksp->dev, skb->data, skb->len, DMA_TO_DEVICE);
+	if (unlikely(dma_mapping_error(ksp->dev, dmap))) {
+		/* Failed to DMA map this SKB, give it back for now */
+		spin_unlock_irq(&ksp->txq_lock);
+		dev_dbg(ksp->dev, "%s: Could not map DMA memory for "\
+			"transmission, trying later\n", ndev->name);
+		return NETDEV_TX_BUSY;
+	}
+
+	ksp->tx_buffers[buff_n].dma_ptr = dmap;
+	/* Mapped okay, store the buffer pointer and length for later */
+	ksp->tx_buffers[buff_n].skb = skb;
+	ksp->tx_buffers[buff_n].length = skb->len;
+
+	/* Fill out the TX descriptor */
+	ksp->tx_ring[buff_n].data_ptr =
+		cpu_to_le32(ksp->tx_buffers[buff_n].dma_ptr);
+	ksp->tx_ring[buff_n].status =
+		cpu_to_le32(TDES_IC | TDES_FS | TDES_LS |
+			    (skb->len & TDES_TBS));
+
+	wmb();
+
+	/* Hand it over to the hardware */
+	ksp->tx_ring[buff_n].owner = cpu_to_le32(TDES_OWN);
+
+	if (++ksp->tx_ring_used == MAX_TX_DESC)
+		netif_stop_queue(ndev);
+
+	/* Kick the TX DMA in case it decided to go IDLE */
+	ks8695_writereg(ksp, KS8695_DTSC, 0);
+
+	/* And update the next ring slot */
+	ksp->tx_ring_next_slot = (buff_n + 1) & MAX_TX_DESC_MASK;
+
+	spin_unlock_irq(&ksp->txq_lock);
+	return NETDEV_TX_OK;
+}
+
+/**
+ *	ks8695_stop - Stop (shutdown) a KS8695 ethernet interface
+ *	@ndev: The net_device to stop
+ *
+ *	This disables the TX queue and cleans up a KS8695 ethernet
+ *	device.
+ */
+static int
+ks8695_stop(struct net_device *ndev)
+{
+	struct ks8695_priv *ksp = netdev_priv(ndev);
+
+	netif_stop_queue(ndev);
+	napi_disable(&ksp->napi);
+
+	ks8695_shutdown(ksp);
+
+	return 0;
+}
+
+/**
+ *	ks8695_open - Open (bring up) a KS8695 ethernet interface
+ *	@ndev: The net_device to open
+ *
+ *	This resets, configures the MAC, initialises the RX ring and
+ *	DMA engines and starts the TX queue for a KS8695 ethernet
+ *	device.
+ */
+static int
+ks8695_open(struct net_device *ndev)
+{
+	struct ks8695_priv *ksp = netdev_priv(ndev);
+	int ret;
+
+	ks8695_reset(ksp);
+
+	ks8695_update_mac(ksp);
+
+	ret = ks8695_init_net(ksp);
+	if (ret) {
+		ks8695_shutdown(ksp);
+		return ret;
+	}
+
+	napi_enable(&ksp->napi);
+	netif_start_queue(ndev);
+
+	return 0;
+}
+
+/* Platform device driver */
+
+/**
+ *	ks8695_init_switch - Init LAN switch to known good defaults.
+ *	@ksp: The device to initialise
+ *
+ *	This initialises the LAN switch in the KS8695 to a known-good
+ *	set of defaults.
+ */
+static void
+ks8695_init_switch(struct ks8695_priv *ksp)
+{
+	u32 ctrl;
+
+	/* Default value for SEC0 according to datasheet */
+	ctrl = 0x40819e00;
+
+	/* LED0 = Speed	 LED1 = Link/Activity */
+	ctrl &= ~(SEC0_LLED1S | SEC0_LLED0S);
+	ctrl |= (LLED0S_LINK | LLED1S_LINK_ACTIVITY);
+
+	/* Enable Switch */
+	ctrl |= SEC0_ENABLE;
+
+	writel(ctrl, ksp->phyiface_regs + KS8695_SEC0);
+
+	/* Defaults for SEC1 */
+	writel(0x9400100, ksp->phyiface_regs + KS8695_SEC1);
+}
+
+/**
+ *	ks8695_init_wan_phy - Initialise the WAN PHY to sensible defaults
+ *	@ksp: The device to initialise
+ *
+ *	This initialises a KS8695's WAN phy to sensible values for
+ *	autonegotiation etc.
+ */
+static void
+ks8695_init_wan_phy(struct ks8695_priv *ksp)
+{
+	u32 ctrl;
+
+	/* Support auto-negotiation */
+	ctrl = (WMC_WANAP | WMC_WANA100F | WMC_WANA100H |
+		WMC_WANA10F | WMC_WANA10H);
+
+	/* LED0 = Activity , LED1 = Link */
+	ctrl |= (WLED0S_ACTIVITY | WLED1S_LINK);
+
+	/* Restart Auto-negotiation */
+	ctrl |= WMC_WANR;
+
+	writel(ctrl, ksp->phyiface_regs + KS8695_WMC);
+
+	writel(0, ksp->phyiface_regs + KS8695_WPPM);
+	writel(0, ksp->phyiface_regs + KS8695_PPS);
+}
+
+static const struct net_device_ops ks8695_netdev_ops = {
+	.ndo_open		= ks8695_open,
+	.ndo_stop		= ks8695_stop,
+	.ndo_start_xmit		= ks8695_start_xmit,
+	.ndo_tx_timeout		= ks8695_timeout,
+	.ndo_set_mac_address	= ks8695_set_mac,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_set_rx_mode	= ks8695_set_multicast,
+};
+
+/**
+ *	ks8695_probe - Probe and initialise a KS8695 ethernet interface
+ *	@pdev: The platform device to probe
+ *
+ *	Initialise a KS8695 ethernet device from platform data.
+ *
+ *	This driver requires at least one IORESOURCE_MEM for the
+ *	registers and two IORESOURCE_IRQ for the RX and TX IRQs
+ *	respectively. It can optionally take an additional
+ *	IORESOURCE_MEM for the switch or phy in the case of the lan or
+ *	wan ports, and an IORESOURCE_IRQ for the link IRQ for the wan
+ *	port.
+ */
+static int
+ks8695_probe(struct platform_device *pdev)
+{
+	struct ks8695_priv *ksp;
+	struct net_device *ndev;
+	struct resource *regs_res, *phyiface_res;
+	struct resource *rxirq_res, *txirq_res, *linkirq_res;
+	int ret = 0;
+	int buff_n;
+	u32 machigh, maclow;
+
+	/* Initialise a net_device */
+	ndev = alloc_etherdev(sizeof(struct ks8695_priv));
+	if (!ndev)
+		return -ENOMEM;
+
+	SET_NETDEV_DEV(ndev, &pdev->dev);
+
+	dev_dbg(&pdev->dev, "ks8695_probe() called\n");
+
+	/* Configure our private structure a little */
+	ksp = netdev_priv(ndev);
+
+	ksp->dev = &pdev->dev;
+	ksp->ndev = ndev;
+	ksp->msg_enable = NETIF_MSG_LINK;
+
+	/* Retrieve resources */
+	regs_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	phyiface_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+
+	rxirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	txirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
+	linkirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 2);
+
+	if (!(regs_res && rxirq_res && txirq_res)) {
+		dev_err(ksp->dev, "insufficient resources\n");
+		ret = -ENOENT;
+		goto failure;
+	}
+
+	ksp->regs_req = request_mem_region(regs_res->start,
+					   resource_size(regs_res),
+					   pdev->name);
+
+	if (!ksp->regs_req) {
+		dev_err(ksp->dev, "cannot claim register space\n");
+		ret = -EIO;
+		goto failure;
+	}
+
+	ksp->io_regs = ioremap(regs_res->start, resource_size(regs_res));
+
+	if (!ksp->io_regs) {
+		dev_err(ksp->dev, "failed to ioremap registers\n");
+		ret = -EINVAL;
+		goto failure;
+	}
+
+	if (phyiface_res) {
+		ksp->phyiface_req =
+			request_mem_region(phyiface_res->start,
+					   resource_size(phyiface_res),
+					   phyiface_res->name);
+
+		if (!ksp->phyiface_req) {
+			dev_err(ksp->dev,
+				"cannot claim switch register space\n");
+			ret = -EIO;
+			goto failure;
+		}
+
+		ksp->phyiface_regs = ioremap(phyiface_res->start,
+					     resource_size(phyiface_res));
+
+		if (!ksp->phyiface_regs) {
+			dev_err(ksp->dev,
+				"failed to ioremap switch registers\n");
+			ret = -EINVAL;
+			goto failure;
+		}
+	}
+
+	ksp->rx_irq = rxirq_res->start;
+	ksp->rx_irq_name = rxirq_res->name ? rxirq_res->name : "Ethernet RX";
+	ksp->tx_irq = txirq_res->start;
+	ksp->tx_irq_name = txirq_res->name ? txirq_res->name : "Ethernet TX";
+	ksp->link_irq = (linkirq_res ? linkirq_res->start : -1);
+	ksp->link_irq_name = (linkirq_res && linkirq_res->name) ?
+		linkirq_res->name : "Ethernet Link";
+
+	/* driver system setup */
+	ndev->netdev_ops = &ks8695_netdev_ops;
+	ndev->watchdog_timeo	 = msecs_to_jiffies(watchdog);
+
+	netif_napi_add(ndev, &ksp->napi, ks8695_poll, NAPI_WEIGHT);
+
+	/* Retrieve the default MAC addr from the chip. */
+	/* The bootloader should have left it in there for us. */
+
+	machigh = ks8695_readreg(ksp, KS8695_MAH);
+	maclow = ks8695_readreg(ksp, KS8695_MAL);
+
+	ndev->dev_addr[0] = (machigh >> 8) & 0xFF;
+	ndev->dev_addr[1] = machigh & 0xFF;
+	ndev->dev_addr[2] = (maclow >> 24) & 0xFF;
+	ndev->dev_addr[3] = (maclow >> 16) & 0xFF;
+	ndev->dev_addr[4] = (maclow >> 8) & 0xFF;
+	ndev->dev_addr[5] = maclow & 0xFF;
+
+	if (!is_valid_ether_addr(ndev->dev_addr))
+		dev_warn(ksp->dev, "%s: Invalid ethernet MAC address. Please "
+			 "set using ifconfig\n", ndev->name);
+
+	/* In order to be efficient memory-wise, we allocate both
+	 * rings in one go.
+	 */
+	ksp->ring_base = dma_alloc_coherent(&pdev->dev, RING_DMA_SIZE,
+					    &ksp->ring_base_dma, GFP_KERNEL);
+	if (!ksp->ring_base) {
+		ret = -ENOMEM;
+		goto failure;
+	}
+
+	/* Specify the TX DMA ring buffer */
+	ksp->tx_ring = ksp->ring_base;
+	ksp->tx_ring_dma = ksp->ring_base_dma;
+
+	/* And initialise the queue's lock */
+	spin_lock_init(&ksp->txq_lock);
+	spin_lock_init(&ksp->rx_lock);
+
+	/* Specify the RX DMA ring buffer */
+	ksp->rx_ring = ksp->ring_base + TX_RING_DMA_SIZE;
+	ksp->rx_ring_dma = ksp->ring_base_dma + TX_RING_DMA_SIZE;
+
+	/* Zero the descriptor rings */
+	memset(ksp->tx_ring, 0, TX_RING_DMA_SIZE);
+	memset(ksp->rx_ring, 0, RX_RING_DMA_SIZE);
+
+	/* Build the rings */
+	for (buff_n = 0; buff_n < MAX_TX_DESC; ++buff_n) {
+		ksp->tx_ring[buff_n].next_desc =
+			cpu_to_le32(ksp->tx_ring_dma +
+				    (sizeof(struct tx_ring_desc) *
+				     ((buff_n + 1) & MAX_TX_DESC_MASK)));
+	}
+
+	for (buff_n = 0; buff_n < MAX_RX_DESC; ++buff_n) {
+		ksp->rx_ring[buff_n].next_desc =
+			cpu_to_le32(ksp->rx_ring_dma +
+				    (sizeof(struct rx_ring_desc) *
+				     ((buff_n + 1) & MAX_RX_DESC_MASK)));
+	}
+
+	/* Initialise the port (physically) */
+	if (ksp->phyiface_regs && ksp->link_irq == -1) {
+		ks8695_init_switch(ksp);
+		ksp->dtype = KS8695_DTYPE_LAN;
+		ndev->ethtool_ops = &ks8695_ethtool_ops;
+	} else if (ksp->phyiface_regs && ksp->link_irq != -1) {
+		ks8695_init_wan_phy(ksp);
+		ksp->dtype = KS8695_DTYPE_WAN;
+		ndev->ethtool_ops = &ks8695_wan_ethtool_ops;
+	} else {
+		/* No initialisation since HPNA does not have a PHY */
+		ksp->dtype = KS8695_DTYPE_HPNA;
+		ndev->ethtool_ops = &ks8695_ethtool_ops;
+	}
+
+	/* And bring up the net_device with the net core */
+	platform_set_drvdata(pdev, ndev);
+	ret = register_netdev(ndev);
+
+	if (ret == 0) {
+		dev_info(ksp->dev, "ks8695 ethernet (%s) MAC: %pM\n",
+			 ks8695_port_type(ksp), ndev->dev_addr);
+	} else {
+		/* Report the failure to register the net_device */
+		dev_err(ksp->dev, "ks8695net: failed to register netdev.\n");
+		goto failure;
+	}
+
+	/* All is well */
+	return 0;
+
+	/* Error exit path */
+failure:
+	ks8695_release_device(ksp);
+	free_netdev(ndev);
+
+	return ret;
+}
+
+/**
+ *	ks8695_drv_suspend - Suspend a KS8695 ethernet platform device.
+ *	@pdev: The device to suspend
+ *	@state: The suspend state
+ *
+ *	This routine detaches and shuts down a KS8695 ethernet device.
+ */
+static int
+ks8695_drv_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct ks8695_priv *ksp = netdev_priv(ndev);
+
+	ksp->in_suspend = 1;
+
+	if (netif_running(ndev)) {
+		netif_device_detach(ndev);
+		ks8695_shutdown(ksp);
+	}
+
+	return 0;
+}
+
+/**
+ *	ks8695_drv_resume - Resume a KS8695 ethernet platform device.
+ *	@pdev: The device to resume
+ *
+ *	This routine re-initialises and re-attaches a KS8695 ethernet
+ *	device.
+ */
+static int
+ks8695_drv_resume(struct platform_device *pdev)
+{
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct ks8695_priv *ksp = netdev_priv(ndev);
+
+	if (netif_running(ndev)) {
+		ks8695_reset(ksp);
+		ks8695_init_net(ksp);
+		ks8695_set_multicast(ndev);
+		netif_device_attach(ndev);
+	}
+
+	ksp->in_suspend = 0;
+
+	return 0;
+}
+
+/**
+ *	ks8695_drv_remove - Remove a KS8695 net device on driver unload.
+ *	@pdev: The platform device to remove
+ *
+ *	This unregisters and releases a KS8695 ethernet device.
+ */
+static int
+ks8695_drv_remove(struct platform_device *pdev)
+{
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct ks8695_priv *ksp = netdev_priv(ndev);
+
+	netif_napi_del(&ksp->napi);
+
+	unregister_netdev(ndev);
+	ks8695_release_device(ksp);
+	free_netdev(ndev);
+
+	dev_dbg(&pdev->dev, "released and freed device\n");
+	return 0;
+}
+
+static struct platform_driver ks8695_driver = {
+	.driver = {
+		.name	= MODULENAME,
+	},
+	.probe		= ks8695_probe,
+	.remove		= ks8695_drv_remove,
+	.suspend	= ks8695_drv_suspend,
+	.resume		= ks8695_drv_resume,
+};
+
+module_platform_driver(ks8695_driver);
+
+MODULE_AUTHOR("Simtec Electronics");
+MODULE_DESCRIPTION("Micrel KS8695 (Centaur) Ethernet driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" MODULENAME);
+
+module_param(watchdog, int, 0400);
+MODULE_PARM_DESC(watchdog, "transmit timeout in milliseconds");