Subject: [PATCH v2] netdev: Added KS8842 driver

From: Richard Röjfors<[email-masked]>
Date: Wed, 03 Jun 2009 11:48:37 +0200

This is a driver for the Micrel KS8842 ethernet switch.

The supplied code is for driving the KS8842 through the Timberdale FPGA
on the Russellville board, a development board for Intel Atom CPU
in the automotive area.

Signed-off-by: Richard Röjfors <[email-masked]>
---
Index: linux-2.6.30-rc7/drivers/net/Kconfig
===================================================================
--- linux-2.6.30-rc7/drivers/net/Kconfig	(revision 861)
+++ linux-2.6.30-rc7/drivers/net/Kconfig	(revision 872)
@@ -1722,6 +1722,11 @@

 	  Please email feedback to <[email-masked]>.

+config KS8842
+	tristate "Micrel KSZ8842"
+	help
+	  This platform driver is for Micrel KSZ8842 chip.
+
 config VIA_RHINE
 	tristate "VIA Rhine support"
 	depends on NET_PCI && PCI
Index: linux-2.6.30-rc7/drivers/net/Makefile
===================================================================
--- linux-2.6.30-rc7/drivers/net/Makefile	(revision 861)
+++ linux-2.6.30-rc7/drivers/net/Makefile	(revision 872)
@@ -84,6 +84,7 @@
 obj-$(CONFIG_SKGE) += skge.o
 obj-$(CONFIG_SKY2) += sky2.o
 obj-$(CONFIG_SKFP) += skfp/
+obj-$(CONFIG_KS8842)	+= ks8842.o
 obj-$(CONFIG_VIA_RHINE) += via-rhine.o
 obj-$(CONFIG_VIA_VELOCITY) += via-velocity.o
 obj-$(CONFIG_ADAPTEC_STARFIRE) += starfire.o
Index: linux-2.6.30-rc7/drivers/net/ks8842.c
===================================================================
--- linux-2.6.30-rc7/drivers/net/ks8842.c	(revision 0)
+++ linux-2.6.30-rc7/drivers/net/ks8842.c	(revision 872)
@@ -0,0 +1,749 @@
+/*
+ * ks8842_main.c timberdale KS8842 ethernet driver
+ * Copyright (c) 2009 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* Supports:
+ * The Micrel KS8842 behind the timberdale FPGA
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+
+#define DRV_NAME "ks8842"
+
+/* Timberdale specific Registers */
+#define REG_TIMB_RST	0x1c
+
+/* KS8842 registers */
+
+#define REG_SELECT_BANK 0x0e
+
+/* bank 0 registers */
+#define REG_QRFCR	0x04
+
+/* bank 2 registers */
+#define REG_MARL	0x00
+#define REG_MARM	0x02
+#define REG_MARH	0x04
+
+/* bank 3 registers */
+#define REG_GRR		0x06
+
+/* bank 16 registers */
+#define REG_TXCR	0x00
+#define REG_TXSR	0x02
+#define REG_RXCR	0x04
+#define REG_TXMIR	0x08
+#define REG_RXMIR	0x0A
+
+/* bank 17 registers */
+#define REG_TXQCR	0x00
+#define REG_RXQCR	0x02
+#define REG_TXFDPR	0x04
+#define REG_RXFDPR	0x06
+#define REG_QMU_DATA_LO 0x08
+#define REG_QMU_DATA_HI 0x0A
+
+/* bank 18 registers */
+#define REG_IER		0x00
+#define IRQ_LINK_CHANGE	0x8000
+#define IRQ_TX		0x4000
+#define IRQ_RX		0x2000
+#define IRQ_RX_OVERRUN	0x0800
+#define IRQ_TX_STOPPED	0x0200
+#define IRQ_RX_STOPPED	0x0100
+#define IRQ_RX_ERROR	0x0080
+#define ENABLED_IRQS	(IRQ_LINK_CHANGE | IRQ_TX | IRQ_RX | IRQ_RX_STOPPED | \
+		IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
+#define REG_ISR		0x02
+#define REG_RXSR	0x04
+#define RXSR_VALID	0x8000
+#define RXSR_BROADCAST	0x80
+#define RXSR_MULTICAST	0x40
+#define RXSR_UNICAST	0x20
+#define RXSR_FRAMETYPE	0x08
+#define RXSR_TOO_LONG	0x04
+#define RXSR_RUNT	0x02
+#define RXSR_CRC_ERROR	0x01
+#define RXSR_ERROR	(RXSR_TOO_LONG | RXSR_RUNT | RXSR_CRC_ERROR)
+
+/* bank 32 registers */
+#define REG_SW_ID_AND_ENABLE	0x00
+#define REG_SGCR1		0x02
+#define REG_SGCR2		0x04
+#define REG_SGCR3		0x06
+
+/* bank 39 registers */
+#define REG_MACAR1		0x00
+#define REG_MACAR2		0x02
+#define REG_MACAR3		0x04
+
+/* bank 45 registers */
+#define REG_P1MBCR		0x00
+#define REG_P1MBSR		0x02
+
+/* bank 46 registers */
+#define REG_P2MBCR		0x00
+#define REG_P2MBSR		0x02
+
+/* bank 48 registers */
+#define REG_P1CR2		0x02
+
+/* bank 49 registers */
+#define REG_P1CR4		0x02
+#define REG_P1SR		0x04
+
+struct ks8842_adapter {
+	u8 __iomem	*hw_addr;
+	int		irq;
+	struct tasklet_struct	tasklet;
+	spinlock_t	lock; /* spinlock to be interrupt safe */
+	struct net_device_stats	net_stats;
+	struct platform_device *pdev;
+};
+
+static inline void ks8842_select_bank(struct ks8842_adapter *adapter, u16 bank)
+{
+	iowrite16(bank, adapter->hw_addr + REG_SELECT_BANK);
+}
+
+static inline void ks8842_write8(struct ks8842_adapter *adapter, u16 bank,
+	u8 value, int offset)
+{
+	ks8842_select_bank(adapter, bank);
+	iowrite8(value, adapter->hw_addr + offset);
+}
+
+static inline void ks8842_write16(struct ks8842_adapter *adapter, u16 bank,
+	u16 value, int offset)
+{
+	ks8842_select_bank(adapter, bank);
+	iowrite16(value, adapter->hw_addr + offset);
+}
+
+static inline void ks8842_enable_bits(struct ks8842_adapter *adapter, u16 bank,
+	u16 bits, int offset)
+{
+	u16 reg;
+	ks8842_select_bank(adapter, bank);
+	reg = ioread16(adapter->hw_addr + offset);
+	reg |= bits;
+	iowrite16(reg, adapter->hw_addr + offset);
+}
+
+static inline void ks8842_clear_bits(struct ks8842_adapter *adapter, u16 bank,
+	u16 bits, int offset)
+{
+	u16 reg;
+	ks8842_select_bank(adapter, bank);
+	reg = ioread16(adapter->hw_addr + offset);
+	reg &= ~bits;
+	iowrite16(reg, adapter->hw_addr + offset);
+}
+
+static inline void ks8842_write32(struct ks8842_adapter *adapter, u16 bank,
+	u32 value, int offset)
+{
+	ks8842_select_bank(adapter, bank);
+	iowrite32(value, adapter->hw_addr + offset);
+}
+
+static inline u8 ks8842_read8(struct ks8842_adapter *adapter, u16 bank,
+	int offset)
+{
+	ks8842_select_bank(adapter, bank);
+	return ioread8(adapter->hw_addr + offset);
+}
+
+static inline u16 ks8842_read16(struct ks8842_adapter *adapter, u16 bank,
+	int offset)
+{
+	ks8842_select_bank(adapter, bank);
+	return ioread16(adapter->hw_addr + offset);
+}
+
+static inline u32 ks8842_read32(struct ks8842_adapter *adapter, u16 bank,
+	int offset)
+{
+	ks8842_select_bank(adapter, bank);
+	return ioread32(adapter->hw_addr + offset);
+}
+
+static void ks8842_reset(struct ks8842_adapter *adapter)
+{
+	/* The KS8842 goes haywire when doing softare reset
+	 * a work around in the timberdale IP is implemented to
+	 * do a hardware reset instead
+	ks8842_write16(adapter, 3, 1, REG_GRR);
+	msleep(10);
+	iowrite16(0, adapter->hw_addr + REG_GRR);
+	*/
+	iowrite16(32, adapter->hw_addr + REG_SELECT_BANK);
+	iowrite32(0x1, adapter->hw_addr + REG_TIMB_RST);
+	msleep(20);
+}
+
+static void ks8842_update_link_status(struct net_device *netdev,
+	struct ks8842_adapter *adapter)
+{
+	/* check the status of the link */
+	if (ks8842_read16(adapter, 45, REG_P1MBSR) & 0x4) {
+		netif_carrier_on(netdev);
+		netif_wake_queue(netdev);
+	} else {
+		netif_stop_queue(netdev);
+		netif_carrier_off(netdev);
+	}
+}
+
+static void ks8842_enable_tx(struct ks8842_adapter *adapter)
+{
+	ks8842_enable_bits(adapter, 16, 0x01, REG_TXCR);
+}
+
+static void ks8842_disable_tx(struct ks8842_adapter *adapter)
+{
+	ks8842_clear_bits(adapter, 16, 0x01, REG_TXCR);
+}
+
+static void ks8842_enable_rx(struct ks8842_adapter *adapter)
+{
+	ks8842_enable_bits(adapter, 16, 0x01, REG_RXCR);
+}
+
+static void ks8842_disable_rx(struct ks8842_adapter *adapter)
+{
+	ks8842_clear_bits(adapter, 16, 0x01, REG_RXCR);
+}
+
+static void ks8842_reset_hw(struct ks8842_adapter *adapter)
+{
+	/* reset the HW */
+	ks8842_reset(adapter);
+
+	/* Enable QMU Transmit flow control / transmit padding / Transmit CRC */
+	ks8842_write16(adapter, 16, 0x000E, REG_TXCR);
+
+	/* enable the receiver, uni + multi + broadcast + flow ctrl
+		+ crc strip */
+	ks8842_write16(adapter, 16, 0x8 | 0x20 | 0x40 | 0x80 | 0x400,
+		REG_RXCR);
+
+	/* TX frame pointer autoincrement */
+	ks8842_write16(adapter, 17, 0x4000, REG_TXFDPR);
+
+	/* RX frame pointer autoincrement */
+	ks8842_write16(adapter, 17, 0x4000, REG_RXFDPR);
+
+	/* RX 2 kb high watermark */
+	ks8842_write16(adapter, 0, 0x1000, REG_QRFCR);
+
+	/* aggresive back off in half duplex */
+	ks8842_enable_bits(adapter, 32, 1 << 8, REG_SGCR1);
+
+	/* enable no excessive collison drop */
+	ks8842_enable_bits(adapter, 32, 1 << 3, REG_SGCR2);
+
+	/* Enable port 1 force flow control / back pressure / transmit / recv */
+	ks8842_write16(adapter, 48, 0x1E07, REG_P1CR2);
+
+	/* restart port auto-negotiation */
+	ks8842_enable_bits(adapter, 49, 1 << 13, REG_P1CR4);
+	/* only advertise 10Mbps */
+	ks8842_clear_bits(adapter, 49, 3 << 2, REG_P1CR4);
+
+	/* Enable the transmitter */
+	ks8842_enable_tx(adapter);
+
+	/* Enable the receiver */
+	ks8842_enable_rx(adapter);
+
+	/* clear all interrupts */
+	ks8842_write16(adapter, 18, 0xffff, REG_ISR);
+
+	/* enable interrupts */
+	ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
+
+	/* enable the switch */
+	ks8842_write16(adapter, 32, 0x1, REG_SW_ID_AND_ENABLE);
+}
+
+static void ks8842_read_mac_addr(struct ks8842_adapter *adapter, u8 *dest)
+{
+	int i;
+	u16 mac;
+
+	for (i = 0; i < ETH_ALEN; i++)
+		dest[ETH_ALEN - i - 1] = ks8842_read8(adapter, 2, REG_MARL + i);
+
+	/* make sure the switch port uses the same MAC as the QMU */
+	mac = ks8842_read16(adapter, 2, REG_MARL);
+	ks8842_write16(adapter, 39, mac, REG_MACAR1);
+	mac = ks8842_read16(adapter, 2, REG_MARM);
+	ks8842_write16(adapter, 39, mac, REG_MACAR2);
+	mac = ks8842_read16(adapter, 2, REG_MARH);
+	ks8842_write16(adapter, 39, mac, REG_MACAR3);
+}
+
+static inline u16 ks8842_tx_fifo_space(struct ks8842_adapter *adapter)
+{
+	return ks8842_read16(adapter, 16, REG_TXMIR) & 0x1fff;
+}
+
+static int ks8842_tx_frame(struct sk_buff *skb, struct net_device *netdev)
+{
+	struct ks8842_adapter *adapter = netdev_priv(netdev);
+	int len = skb->len;
+	u32 *ptr = (u32 *)skb->data;
+	u32 ctrl;
+
+	dev_dbg(&adapter->pdev->dev,
+		"%s: len %u head %p data %p tail %p end %p\n",
+		__func__, skb->len, skb->head, skb->data,
+		skb_tail_pointer(skb), skb_end_pointer(skb));
+
+	/* check FIFO buffer space, we need space for CRC and command bits */
+	if (ks8842_tx_fifo_space(adapter) < len + 8)
+		return -ENOBUFS;
+
+	/* the control word, enable IRQ, port 1 and the length */
+	ctrl = 0x8000 | 0x100 | (len << 16);
+	ks8842_write32(adapter, 17, ctrl, REG_QMU_DATA_LO);
+
+	adapter->net_stats.tx_bytes += len;
+
+	/* copy buffer */
+	while (len > 0) {
+		iowrite32(*ptr, adapter->hw_addr + REG_QMU_DATA_LO);
+		len -= sizeof(u32);
+		ptr++;
+	}
+
+	/* enqueue packet */
+	ks8842_write16(adapter, 17, 1, REG_TXQCR);
+
+	dev_kfree_skb(skb);
+
+	return 0;
+}
+
+static void ks8842_rx_frame(struct net_device *netdev,
+	struct ks8842_adapter *adapter)
+{
+	u32 status = ks8842_read32(adapter, 17, REG_QMU_DATA_LO);
+	int len = (status >> 16) & 0x7ff;
+
+	status &= 0xffff;
+
+	dev_dbg(&adapter->pdev->dev, "%s - rx_data: status: %x\n",
+		__func__, status);
+
+	/* check the status */
+	if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
+		struct sk_buff *skb = dev_alloc_skb(len + 2);
+
+		dev_dbg(&adapter->pdev->dev, "%s, got package, len: %d\n",
+			__func__, len);
+		if (skb) {
+			u32 *data;
+
+			adapter->net_stats.rx_packets++;
+			adapter->net_stats.rx_bytes += len;
+			if (status & RXSR_MULTICAST)
+				adapter->net_stats.multicast++;
+
+			/* Align socket buffer in 4-byte boundary for
+				 better performance. */
+			skb_reserve(skb, 2);
+			data = (u32 *)skb_put(skb, len);
+
+			ks8842_select_bank(adapter, 17);
+			while (len > 0) {
+				*data++ = ioread32(adapter->hw_addr +
+					REG_QMU_DATA_LO);
+				len -= sizeof(u32);
+			}
+
+			skb->dev = netdev;
+			skb->protocol = eth_type_trans(skb, netdev);
+			netdev->last_rx = jiffies;
+			netif_rx(skb);
+		} else
+			adapter->net_stats.rx_dropped++;
+	} else {
+		dev_dbg(&adapter->pdev->dev, "RX error, status: %x\n", status);
+		adapter->net_stats.rx_errors++;
+		if (status & RXSR_TOO_LONG)
+			adapter->net_stats.rx_length_errors++;
+		if (status & RXSR_CRC_ERROR)
+			adapter->net_stats.rx_crc_errors++;
+		if (status & RXSR_RUNT)
+			adapter->net_stats.rx_frame_errors++;
+	}
+
+	/* set high watermark to 3K */
+	ks8842_clear_bits(adapter, 0, 1 << 12, REG_QRFCR);
+
+	/* release the frame */
+	ks8842_write16(adapter, 17, 0x01, REG_RXQCR);
+
+	/* set high watermark to 2K */
+	ks8842_enable_bits(adapter, 0, 1 << 12, REG_QRFCR);
+}
+
+void ks8842_handle_rx(struct net_device *netdev, struct ks8842_adapter *adapter)
+{
+	u16 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
+	dev_dbg(&adapter->pdev->dev, "%s Entry - rx_data: %d\n",
+		__func__, rx_data);
+	while (rx_data) {
+		ks8842_rx_frame(netdev, adapter);
+		rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
+	}
+}
+
+void ks8842_handle_tx(struct net_device *netdev, struct ks8842_adapter *adapter)
+{
+	u16 sr = ks8842_read16(adapter, 16, REG_TXSR);
+	dev_dbg(&adapter->pdev->dev, "%s - entry, sr: %x\n", __func__, sr);
+	adapter->net_stats.tx_packets++;
+	if (netif_queue_stopped(netdev))
+		netif_wake_queue(netdev);
+}
+
+void ks8842_handle_rx_overrun(struct net_device *netdev,
+	struct ks8842_adapter *adapter)
+{
+	dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);
+	adapter->net_stats.rx_errors++;
+	adapter->net_stats.rx_fifo_errors++;
+}
+
+void ks8842_tasklet(unsigned long arg)
+{
+	struct net_device *netdev = (struct net_device *)arg;
+	struct ks8842_adapter *adapter = netdev_priv(netdev);
+	u16 isr;
+	unsigned long flags;
+	u16 entry_bank;
+
+	/* read current bank to be able to set it back */
+	spin_lock_irqsave(&adapter->lock, flags);
+	entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
+	spin_unlock_irqrestore(&adapter->lock, flags);
+
+	isr = ks8842_read16(adapter, 18, REG_ISR);
+	dev_dbg(&adapter->pdev->dev, "%s - ISR: 0x%x\n", __func__, isr);
+
+	/* Ack */
+	ks8842_write16(adapter, 18, isr, REG_ISR);
+
+	if (!netif_running(netdev))
+		return;
+
+	if (isr & IRQ_LINK_CHANGE)
+		ks8842_update_link_status(netdev, adapter);
+
+	if (isr & (IRQ_RX | IRQ_RX_ERROR))
+		ks8842_handle_rx(netdev, adapter);
+
+	if (isr & IRQ_TX)
+		ks8842_handle_tx(netdev, adapter);
+
+	if (isr & IRQ_RX_OVERRUN)
+		ks8842_handle_rx_overrun(netdev, adapter);
+
+	if (isr & IRQ_TX_STOPPED) {
+		ks8842_disable_tx(adapter);
+		ks8842_enable_tx(adapter);
+	}
+
+	if (isr & IRQ_RX_STOPPED) {
+		ks8842_disable_rx(adapter);
+		ks8842_enable_rx(adapter);
+	}
+
+	/* re-enable interrupts, put back the bank selection register */
+	spin_lock_irqsave(&adapter->lock, flags);
+	ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
+	iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
+	spin_unlock_irqrestore(&adapter->lock, flags);
+}
+
+static irqreturn_t ks8842_irq(int irq, void *devid)
+{
+	struct ks8842_adapter *adapter = (struct ks8842_adapter *)devid;
+	u16 isr;
+	u16 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
+	irqreturn_t ret = IRQ_NONE;
+
+	isr = ks8842_read16(adapter, 18, REG_ISR);
+	dev_dbg(&adapter->pdev->dev, "%s - ISR: 0x%x\n", __func__, isr);
+
+	if (isr) {
+		/* disable IRQ */
+		ks8842_write16(adapter, 18, 0x00, REG_IER);
+
+		/* schedule tasklet */
+		tasklet_schedule(&adapter->tasklet);
+
+		ret = IRQ_HANDLED;
+	}
+
+	iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
+
+	return ret;
+}
+
+
+/* Netdevice operations */
+
+static int ks8842_open(struct net_device *netdev)
+{
+	struct ks8842_adapter *adapter = netdev_priv(netdev);
+	int err;
+
+	dev_dbg(&adapter->pdev->dev, "%s - entry\n", __func__);
+
+	/* reset the HW */
+	ks8842_reset_hw(adapter);
+
+	ks8842_update_link_status(netdev, adapter);
+
+	err = request_irq(adapter->irq, ks8842_irq, IRQF_SHARED, DRV_NAME,
+		adapter);
+	if (err) {
+		printk(KERN_ERR "Failed to request IRQ: %d: %d\n",
+			adapter->irq, err);
+		return err;
+	}
+
+	return 0;
+}
+
+static int ks8842_close(struct net_device *netdev)
+{
+	struct ks8842_adapter *adapter = netdev_priv(netdev);
+
+	dev_dbg(&adapter->pdev->dev, "%s - entry\n", __func__);
+
+	/* free the irq */
+	free_irq(adapter->irq, adapter);
+
+	/* disable the switch */
+	ks8842_write16(adapter, 32, 0x0, REG_SW_ID_AND_ENABLE);
+
+	return 0;
+}
+
+static int ks8842_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
+{
+	int ret;
+	struct ks8842_adapter *adapter = netdev_priv(netdev);
+
+	dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);
+
+	ret = ks8842_tx_frame(skb, netdev);
+
+	if (ks8842_tx_fifo_space(adapter) <  netdev->mtu + 8)
+		netif_stop_queue(netdev);
+
+	return ret;
+}
+
+static struct net_device_stats *ks8842_get_stats(struct net_device *netdev)
+{
+	struct ks8842_adapter *adapter = netdev_priv(netdev);
+
+	return &adapter->net_stats;
+}
+
+static int ks8842_set_mac(struct net_device *netdev, void *p)
+{
+	struct ks8842_adapter *adapter = netdev_priv(netdev);
+	unsigned long flags;
+	struct sockaddr *addr = p;
+	char *mac = (u8 *)addr->sa_data;
+	int i;
+
+	dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);
+
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EADDRNOTAVAIL;
+
+	memcpy(netdev->dev_addr, mac, netdev->addr_len);
+
+	spin_lock_irqsave(&adapter->lock, flags);
+	for (i = 0; i < ETH_ALEN; i++) {
+		ks8842_write8(adapter, 2, mac[ETH_ALEN - i - 1], REG_MARL + i);
+		ks8842_write8(adapter, 39, mac[ETH_ALEN - i - 1],
+			REG_MACAR1 + i);
+	}
+	spin_unlock_irqrestore(&adapter->lock, flags);
+	return 0;
+}
+
+static void ks8842_tx_timeout(struct net_device *netdev)
+{
+	struct ks8842_adapter *adapter = netdev_priv(netdev);
+	unsigned long flags;
+
+	dev_dbg(&adapter->pdev->dev, "%s: entry\n", __func__);
+
+	spin_lock_irqsave(&adapter->lock, flags);
+	/* disable interrupts */
+	ks8842_write16(adapter, 18, 0, REG_IER);
+	ks8842_write16(adapter, 18, 0xFFFF, REG_ISR);
+	spin_unlock_irqrestore(&adapter->lock, flags);
+
+	ks8842_reset_hw(adapter);
+
+	ks8842_update_link_status(netdev, adapter);
+}
+
+static const struct net_device_ops ks8842_netdev_ops = {
+	.ndo_open		= ks8842_open,
+	.ndo_stop		= ks8842_close,
+	.ndo_start_xmit		= ks8842_xmit_frame,
+	.ndo_get_stats		= ks8842_get_stats,
+	.ndo_set_mac_address	= ks8842_set_mac,
+	.ndo_tx_timeout 	= ks8842_tx_timeout,
+	.ndo_validate_addr	= eth_validate_addr
+};
+
+static struct ethtool_ops ks8842_ethtool_ops = {
+	.get_link		= ethtool_op_get_link,
+};
+
+static int __devinit ks8842_probe(struct platform_device *pdev)
+{
+	int err = -ENOMEM;
+	struct resource *iomem;
+	struct net_device *netdev;
+	struct ks8842_adapter *adapter;
+	u16 id;
+
+	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!request_mem_region(iomem->start, resource_size(iomem), DRV_NAME))
+		goto err_mem_region;
+
+	netdev = alloc_etherdev(sizeof(struct ks8842_adapter));
+	if (!netdev)
+		goto err_alloc_etherdev;
+
+	SET_NETDEV_DEV(netdev, &pdev->dev);
+
+	adapter = netdev_priv(netdev);
+	adapter->hw_addr = ioremap(iomem->start, resource_size(iomem));
+	if (!adapter->hw_addr)
+		goto err_ioremap;
+
+	adapter->irq = platform_get_irq(pdev, 0);
+	if (adapter->irq < 0) {
+		err = adapter->irq;
+		goto err_get_irq;
+	}
+
+	adapter->pdev = pdev;
+
+	tasklet_init(&adapter->tasklet, ks8842_tasklet, (unsigned long)netdev);
+	spin_lock_init(&adapter->lock);
+
+	netdev->netdev_ops = &ks8842_netdev_ops;
+	netdev->ethtool_ops = &ks8842_ethtool_ops;
+
+	strncpy(netdev->name, DRV_NAME, sizeof(netdev->name) - 1);
+
+	ks8842_read_mac_addr(adapter, netdev->dev_addr);
+
+	id = ks8842_read16(adapter, 32, REG_SW_ID_AND_ENABLE);
+
+	/* tell the stack to leave us alone until ks8842_open() is called */
+	netif_carrier_off(netdev);
+	netif_stop_queue(netdev);
+
+	strcpy(netdev->name, "eth%d");
+	err = register_netdev(netdev);
+	if (err)
+		goto err_register;
+
+	platform_set_drvdata(pdev, netdev);
+
+	printk(KERN_INFO DRV_NAME
+		" Found chip, family: 0x%x, id: 0x%x, rev: 0x%x\n",
+		(id >> 8) & 0xff, (id >> 4) & 0xf, (id >> 1) & 0x7);
+
+	return 0;
+
+err_register:
+err_get_irq:
+	iounmap(adapter->hw_addr);
+err_ioremap:
+	kfree(netdev);
+err_alloc_etherdev:
+	release_mem_region(iomem->start, resource_size(iomem));
+err_mem_region:
+	return err;
+}
+
+static int __devexit ks8842_remove(struct platform_device *pdev)
+{
+	struct net_device *netdev = platform_get_drvdata(pdev);
+	struct ks8842_adapter *adapter = netdev_priv(netdev);
+	struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	unregister_netdev(netdev);
+	tasklet_kill(&adapter->tasklet);
+	iounmap(adapter->hw_addr);
+	kfree(netdev);
+	release_mem_region(iomem->start, resource_size(iomem));
+	platform_set_drvdata(pdev, NULL);
+	return 0;
+}
+
+
+static struct platform_driver ks8842_platform_driver = {
+	.driver = {
+		.name	= DRV_NAME,
+		.owner	= THIS_MODULE,
+	},
+	.probe		= ks8842_probe,
+	.remove		= ks8842_remove,
+};
+
+static int __init ks8842_init(void)
+{
+	return platform_driver_register(&ks8842_platform_driver);
+}
+
+static void __exit ks8842_exit(void)
+{
+	platform_driver_unregister(&ks8842_platform_driver);
+}
+
+module_init(ks8842_init);
+module_exit(ks8842_exit);
+
+MODULE_DESCRIPTION("Timberdale KS8842 ethernet driver");
+MODULE_AUTHOR("Mocean Laboratories <[email-masked]>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:ks8842");
+