netdev: Added KS8842 driver

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 <richard.rojfors.ext@mocean-labs.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 732 insertions, 0 deletions

diff --git a/drivers/net/ks8842.c b/drivers/net/ks8842.c
new file mode 100644
index 000000000000..39b0aea2aab3
--- /dev/null
+++ b/drivers/net/ks8842.c
@@ -0,0 +1,732 @@
+/*
+ * 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 {
+        void __iomem    *hw_addr;
+        int             irq;
+        struct tasklet_struct   tasklet;
+        spinlock_t      lock; /* spinlock to be interrupt safe */
+        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 NETDEV_TX_BUSY;
+
+        /* the control word, enable IRQ, port 1 and the length */
+        ctrl = 0x8000 | 0x100 | (len << 16);
+        ks8842_write32(adapter, 17, ctrl, REG_QMU_DATA_LO);
+
+        netdev->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 NETDEV_TX_OK;
+}
+
+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 = netdev_alloc_skb(netdev, len + 2);
+
+                dev_dbg(&adapter->pdev->dev, "%s, got package, len: %d\n",
+                        __func__, len);
+                if (skb) {
+                        u32 *data;
+
+                        netdev->stats.rx_packets++;
+                        netdev->stats.rx_bytes += len;
+                        if (status & RXSR_MULTICAST)
+                                netdev->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->protocol = eth_type_trans(skb, netdev);
+                        netif_rx(skb);
+                } else
+                        netdev->stats.rx_dropped++;
+        } else {
+                dev_dbg(&adapter->pdev->dev, "RX error, status: %x\n", status);
+                netdev->stats.rx_errors++;
+                if (status & RXSR_TOO_LONG)
+                        netdev->stats.rx_length_errors++;
+                if (status & RXSR_CRC_ERROR)
+                        netdev->stats.rx_crc_errors++;
+                if (status & RXSR_RUNT)
+                        netdev->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);
+        netdev->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__);
+        netdev->stats.rx_errors++;
+        netdev->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 = 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 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_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;
+
+        ks8842_read_mac_addr(adapter, netdev->dev_addr);
+
+        id = ks8842_read16(adapter, 32, REG_SW_ID_AND_ENABLE);
+
+        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:
+        free_netdev(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);
+        free_netdev(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 <info@mocean-labs.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:ks8842");
+