Adding upstream version 5.10.209.upstream/5.10.209upstream

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

8 files changed, 11082 insertions, 0 deletions

diff --git a/drivers/net/ethernet/micrel/Kconfig b/drivers/net/ethernet/micrel/Kconfig
new file mode 100644
index 000000000..42bc01413
--- /dev/null
+++ b/drivers/net/ethernet/micrel/Kconfig
@@ -0,0 +1,58 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Micrel device configuration
+#
+
+config NET_VENDOR_MICREL
+	bool "Micrel devices"
+	default y
+	depends on (HAS_IOMEM && DMA_ENGINE) || SPI || PCI || HAS_IOMEM
+	help
+	  If you have a network (Ethernet) card belonging to this class, say Y.
+
+	  Note that the answer to this question doesn't directly affect the
+	  kernel: saying N will just cause the configurator to skip all
+	  the questions about Micrel devices. If you say Y, you will be asked
+	  for your specific card in the following questions.
+
+if NET_VENDOR_MICREL
+
+config KS8842
+	tristate "Micrel KSZ8841/42 with generic bus interface"
+	depends on HAS_IOMEM && DMA_ENGINE
+	help
+	  This platform driver is for KSZ8841(1-port) / KS8842(2-port)
+	  ethernet switch chip (managed, VLAN, QoS) from Micrel or
+	  Timberdale(FPGA).
+
+config KS8851
+	tristate "Micrel KS8851 SPI"
+	depends on SPI
+	select MII
+	select CRC32
+	select EEPROM_93CX6
+	help
+	  SPI driver for Micrel KS8851 SPI attached network chip.
+
+config KS8851_MLL
+	tristate "Micrel KS8851 MLL"
+	depends on HAS_IOMEM
+	select MII
+	select CRC32
+	select EEPROM_93CX6
+	help
+	  This platform driver is for Micrel KS8851 Address/data bus
+	  multiplexed network chip.
+
+config KSZ884X_PCI
+	tristate "Micrel KSZ8841/2 PCI"
+	depends on PCI
+	select MII
+	select CRC32
+	help
+	  This PCI driver is for Micrel KSZ8841/KSZ8842 PCI Ethernet chip.
+
+	  To compile this driver as a module, choose M here. The module
+	  will be called ksz884x.
+
+endif # NET_VENDOR_MICREL
diff --git a/drivers/net/ethernet/micrel/Makefile b/drivers/net/ethernet/micrel/Makefile
new file mode 100644
index 000000000..6ecc4eb30
--- /dev/null
+++ b/drivers/net/ethernet/micrel/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the Micrel network device drivers.
+#
+
+obj-$(CONFIG_KS8842) += ks8842.o
+obj-$(CONFIG_KS8851) += ks8851_common.o ks8851_spi.o
+obj-$(CONFIG_KS8851_MLL) += ks8851_common.o ks8851_par.o
+obj-$(CONFIG_KSZ884X_PCI) += ksz884x.o
diff --git a/drivers/net/ethernet/micrel/ks8842.c b/drivers/net/ethernet/micrel/ks8842.c
new file mode 100644
index 000000000..b27713906
--- /dev/null
+++ b/drivers/net/ethernet/micrel/ks8842.c
@@ -0,0 +1,1259 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ks8842.c timberdale KS8842 ethernet driver
+ * Copyright (c) 2009 Intel Corporation
+ */
+
+/* Supports:
+ * The Micrel KS8842 behind the timberdale FPGA
+ * The genuine Micrel KS8841/42 device with ISA 16/32bit bus interface
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/interrupt.h>
+#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>
+#include <linux/ks8842.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/scatterlist.h>
+
+#define DRV_NAME "ks8842"
+
+/* Timberdale specific Registers */
+#define REG_TIMB_RST		0x1c
+#define REG_TIMB_FIFO		0x20
+#define REG_TIMB_ISR		0x24
+#define REG_TIMB_IER		0x28
+#define REG_TIMB_IAR		0x2C
+#define REQ_TIMB_DMA_RESUME	0x30
+
+/* 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)
+/* When running via timberdale in DMA mode, the RX interrupt should be
+   enabled in the KS8842, but not in the FPGA IP, since the IP handles
+   RX DMA internally.
+   TX interrupts are not needed it is handled by the FPGA the driver is
+   notified via DMA callbacks.
+*/
+#define ENABLED_IRQS_DMA_IP	(IRQ_LINK_CHANGE | IRQ_RX_STOPPED | \
+	IRQ_TX_STOPPED | IRQ_RX_OVERRUN | IRQ_RX_ERROR)
+#define ENABLED_IRQS_DMA	(ENABLED_IRQS_DMA_IP | IRQ_RX)
+#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
+
+/* flags passed by platform_device for configuration */
+#define	MICREL_KS884X		0x01	/* 0=Timeberdale(FPGA), 1=Micrel */
+#define	KS884X_16BIT		0x02	/*  1=16bit, 0=32bit */
+
+#define DMA_BUFFER_SIZE		2048
+
+struct ks8842_tx_dma_ctl {
+	struct dma_chan *chan;
+	struct dma_async_tx_descriptor *adesc;
+	void *buf;
+	struct scatterlist sg;
+	int channel;
+};
+
+struct ks8842_rx_dma_ctl {
+	struct dma_chan *chan;
+	struct dma_async_tx_descriptor *adesc;
+	struct sk_buff  *skb;
+	struct scatterlist sg;
+	struct tasklet_struct tasklet;
+	int channel;
+};
+
+#define KS8842_USE_DMA(adapter) (((adapter)->dma_tx.channel != -1) && \
+	 ((adapter)->dma_rx.channel != -1))
+
+struct ks8842_adapter {
+	void __iomem	*hw_addr;
+	int		irq;
+	unsigned long	conf_flags;	/* copy of platform_device config */
+	struct tasklet_struct	tasklet;
+	spinlock_t	lock; /* spinlock to be interrupt safe */
+	struct work_struct timeout_work;
+	struct net_device *netdev;
+	struct device *dev;
+	struct ks8842_tx_dma_ctl	dma_tx;
+	struct ks8842_rx_dma_ctl	dma_rx;
+};
+
+static void ks8842_dma_rx_cb(void *data);
+static void ks8842_dma_tx_cb(void *data);
+
+static inline void ks8842_resume_dma(struct ks8842_adapter *adapter)
+{
+	iowrite32(1, adapter->hw_addr + REQ_TIMB_DMA_RESUME);
+}
+
+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)
+{
+	if (adapter->conf_flags & MICREL_KS884X) {
+		ks8842_write16(adapter, 3, 1, REG_GRR);
+		msleep(10);
+		iowrite16(0, adapter->hw_addr + REG_GRR);
+	} else {
+		/* 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);
+		*/
+		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);
+
+	/* aggressive 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);
+
+	/* 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 */
+	if (KS8842_USE_DMA(adapter)) {
+		/* When running in DMA Mode the RX interrupt is not enabled in
+		   timberdale because RX data is received by DMA callbacks
+		   it must still be enabled in the KS8842 because it indicates
+		   to timberdale when there is RX data for it's DMA FIFOs */
+		iowrite16(ENABLED_IRQS_DMA_IP, adapter->hw_addr + REG_TIMB_IER);
+		ks8842_write16(adapter, 18, ENABLED_IRQS_DMA, REG_IER);
+	} else {
+		if (!(adapter->conf_flags & MICREL_KS884X))
+			iowrite16(ENABLED_IRQS,
+				adapter->hw_addr + REG_TIMB_IER);
+		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);
+
+	if (adapter->conf_flags & MICREL_KS884X) {
+		/*
+		the sequence of saving mac addr between MAC and Switch is
+		different.
+		*/
+
+		mac = ks8842_read16(adapter, 2, REG_MARL);
+		ks8842_write16(adapter, 39, mac, REG_MACAR3);
+		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_MACAR1);
+	} else {
+
+		/* 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 void ks8842_write_mac_addr(struct ks8842_adapter *adapter, u8 *mac)
+{
+	unsigned long flags;
+	unsigned i;
+
+	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);
+		if (!(adapter->conf_flags & MICREL_KS884X))
+			ks8842_write8(adapter, 39, mac[ETH_ALEN - i - 1],
+				REG_MACAR1 + i);
+	}
+
+	if (adapter->conf_flags & MICREL_KS884X) {
+		/*
+		the sequence of saving mac addr between MAC and Switch is
+		different.
+		*/
+
+		u16 mac;
+
+		mac = ks8842_read16(adapter, 2, REG_MARL);
+		ks8842_write16(adapter, 39, mac, REG_MACAR3);
+		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_MACAR1);
+	}
+	spin_unlock_irqrestore(&adapter->lock, flags);
+}
+
+static inline u16 ks8842_tx_fifo_space(struct ks8842_adapter *adapter)
+{
+	return ks8842_read16(adapter, 16, REG_TXMIR) & 0x1fff;
+}
+
+static int ks8842_tx_frame_dma(struct sk_buff *skb, struct net_device *netdev)
+{
+	struct ks8842_adapter *adapter = netdev_priv(netdev);
+	struct ks8842_tx_dma_ctl *ctl = &adapter->dma_tx;
+	u8 *buf = ctl->buf;
+
+	if (ctl->adesc) {
+		netdev_dbg(netdev, "%s: TX ongoing\n", __func__);
+		/* transfer ongoing */
+		return NETDEV_TX_BUSY;
+	}
+
+	sg_dma_len(&ctl->sg) = skb->len + sizeof(u32);
+
+	/* copy data to the TX buffer */
+	/* the control word, enable IRQ, port 1 and the length */
+	*buf++ = 0x00;
+	*buf++ = 0x01; /* Port 1 */
+	*buf++ = skb->len & 0xff;
+	*buf++ = (skb->len >> 8) & 0xff;
+	skb_copy_from_linear_data(skb, buf, skb->len);
+
+	dma_sync_single_range_for_device(adapter->dev,
+		sg_dma_address(&ctl->sg), 0, sg_dma_len(&ctl->sg),
+		DMA_TO_DEVICE);
+
+	/* make sure the length is a multiple of 4 */
+	if (sg_dma_len(&ctl->sg) % 4)
+		sg_dma_len(&ctl->sg) += 4 - sg_dma_len(&ctl->sg) % 4;
+
+	ctl->adesc = dmaengine_prep_slave_sg(ctl->chan,
+		&ctl->sg, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
+	if (!ctl->adesc)
+		return NETDEV_TX_BUSY;
+
+	ctl->adesc->callback_param = netdev;
+	ctl->adesc->callback = ks8842_dma_tx_cb;
+	ctl->adesc->tx_submit(ctl->adesc);
+
+	netdev->stats.tx_bytes += skb->len;
+
+	dev_kfree_skb(skb);
+
+	return NETDEV_TX_OK;
+}
+
+static int ks8842_tx_frame(struct sk_buff *skb, struct net_device *netdev)
+{
+	struct ks8842_adapter *adapter = netdev_priv(netdev);
+	int len = skb->len;
+
+	netdev_dbg(netdev, "%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;
+
+	if (adapter->conf_flags & KS884X_16BIT) {
+		u16 *ptr16 = (u16 *)skb->data;
+		ks8842_write16(adapter, 17, 0x8000 | 0x100, REG_QMU_DATA_LO);
+		ks8842_write16(adapter, 17, (u16)len, REG_QMU_DATA_HI);
+		netdev->stats.tx_bytes += len;
+
+		/* copy buffer */
+		while (len > 0) {
+			iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_LO);
+			iowrite16(*ptr16++, adapter->hw_addr + REG_QMU_DATA_HI);
+			len -= sizeof(u32);
+		}
+	} else {
+
+		u32 *ptr = (u32 *)skb->data;
+		u32 ctrl;
+		/* 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_update_rx_err_counters(struct net_device *netdev, u32 status)
+{
+	netdev_dbg(netdev, "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++;
+}
+
+static void ks8842_update_rx_counters(struct net_device *netdev, u32 status,
+	int len)
+{
+	netdev_dbg(netdev, "RX packet, len: %d\n", len);
+
+	netdev->stats.rx_packets++;
+	netdev->stats.rx_bytes += len;
+	if (status & RXSR_MULTICAST)
+		netdev->stats.multicast++;
+}
+
+static int __ks8842_start_new_rx_dma(struct net_device *netdev)
+{
+	struct ks8842_adapter *adapter = netdev_priv(netdev);
+	struct ks8842_rx_dma_ctl *ctl = &adapter->dma_rx;
+	struct scatterlist *sg = &ctl->sg;
+	int err;
+
+	ctl->skb = netdev_alloc_skb(netdev, DMA_BUFFER_SIZE);
+	if (ctl->skb) {
+		sg_init_table(sg, 1);
+		sg_dma_address(sg) = dma_map_single(adapter->dev,
+			ctl->skb->data, DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
+		if (dma_mapping_error(adapter->dev, sg_dma_address(sg))) {
+			err = -ENOMEM;
+			sg_dma_address(sg) = 0;
+			goto out;
+		}
+
+		sg_dma_len(sg) = DMA_BUFFER_SIZE;
+
+		ctl->adesc = dmaengine_prep_slave_sg(ctl->chan,
+			sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
+
+		if (!ctl->adesc) {
+			err = -ENOMEM;
+			goto out;
+		}
+
+		ctl->adesc->callback_param = netdev;
+		ctl->adesc->callback = ks8842_dma_rx_cb;
+		ctl->adesc->tx_submit(ctl->adesc);
+	} else {
+		err = -ENOMEM;
+		sg_dma_address(sg) = 0;
+		goto out;
+	}
+
+	return 0;
+out:
+	if (sg_dma_address(sg))
+		dma_unmap_single(adapter->dev, sg_dma_address(sg),
+			DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
+	sg_dma_address(sg) = 0;
+	dev_kfree_skb(ctl->skb);
+	ctl->skb = NULL;
+
+	printk(KERN_ERR DRV_NAME": Failed to start RX DMA: %d\n", err);
+	return err;
+}
+
+static void ks8842_rx_frame_dma_tasklet(struct tasklet_struct *t)
+{
+	struct ks8842_adapter *adapter = from_tasklet(adapter, t, dma_rx.tasklet);
+	struct net_device *netdev = adapter->netdev;
+	struct ks8842_rx_dma_ctl *ctl = &adapter->dma_rx;
+	struct sk_buff *skb = ctl->skb;
+	dma_addr_t addr = sg_dma_address(&ctl->sg);
+	u32 status;
+
+	ctl->adesc = NULL;
+
+	/* kick next transfer going */
+	__ks8842_start_new_rx_dma(netdev);
+
+	/* now handle the data we got */
+	dma_unmap_single(adapter->dev, addr, DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
+
+	status = *((u32 *)skb->data);
+
+	netdev_dbg(netdev, "%s - rx_data: status: %x\n",
+		__func__, status & 0xffff);
+
+	/* check the status */
+	if ((status & RXSR_VALID) && !(status & RXSR_ERROR)) {
+		int len = (status >> 16) & 0x7ff;
+
+		ks8842_update_rx_counters(netdev, status, len);
+
+		/* reserve 4 bytes which is the status word */
+		skb_reserve(skb, 4);
+		skb_put(skb, len);
+
+		skb->protocol = eth_type_trans(skb, netdev);
+		netif_rx(skb);
+	} else {
+		ks8842_update_rx_err_counters(netdev, status);
+		dev_kfree_skb(skb);
+	}
+}
+
+static void ks8842_rx_frame(struct net_device *netdev,
+	struct ks8842_adapter *adapter)
+{
+	u32 status;
+	int len;
+
+	if (adapter->conf_flags & KS884X_16BIT) {
+		status = ks8842_read16(adapter, 17, REG_QMU_DATA_LO);
+		len = ks8842_read16(adapter, 17, REG_QMU_DATA_HI);
+		netdev_dbg(netdev, "%s - rx_data: status: %x\n",
+			   __func__, status);
+	} else {
+		status = ks8842_read32(adapter, 17, REG_QMU_DATA_LO);
+		len = (status >> 16) & 0x7ff;
+		status &= 0xffff;
+		netdev_dbg(netdev, "%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_ip_align(netdev, len + 3);
+
+		if (skb) {
+
+			ks8842_update_rx_counters(netdev, status, len);
+
+			if (adapter->conf_flags & KS884X_16BIT) {
+				u16 *data16 = skb_put(skb, len);
+				ks8842_select_bank(adapter, 17);
+				while (len > 0) {
+					*data16++ = ioread16(adapter->hw_addr +
+						REG_QMU_DATA_LO);
+					*data16++ = ioread16(adapter->hw_addr +
+						REG_QMU_DATA_HI);
+					len -= sizeof(u32);
+				}
+			} else {
+				u32 *data = 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
+		ks8842_update_rx_err_counters(netdev, status);
+
+	/* 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);
+}
+
+static void ks8842_handle_rx(struct net_device *netdev,
+	struct ks8842_adapter *adapter)
+{
+	u16 rx_data = ks8842_read16(adapter, 16, REG_RXMIR) & 0x1fff;
+	netdev_dbg(netdev, "%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;
+	}
+}
+
+static void ks8842_handle_tx(struct net_device *netdev,
+	struct ks8842_adapter *adapter)
+{
+	u16 sr = ks8842_read16(adapter, 16, REG_TXSR);
+	netdev_dbg(netdev, "%s - entry, sr: %x\n", __func__, sr);
+	netdev->stats.tx_packets++;
+	if (netif_queue_stopped(netdev))
+		netif_wake_queue(netdev);
+}
+
+static void ks8842_handle_rx_overrun(struct net_device *netdev,
+	struct ks8842_adapter *adapter)
+{
+	netdev_dbg(netdev, "%s: entry\n", __func__);
+	netdev->stats.rx_errors++;
+	netdev->stats.rx_fifo_errors++;
+}
+
+static void ks8842_tasklet(struct tasklet_struct *t)
+{
+	struct ks8842_adapter *adapter = from_tasklet(adapter, t, tasklet);
+	struct net_device *netdev = adapter->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);
+	netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
+
+	/* when running in DMA mode, do not ack RX interrupts, it is handled
+	   internally by timberdale, otherwise it's DMA FIFO:s would stop
+	*/
+	if (KS8842_USE_DMA(adapter))
+		isr &= ~IRQ_RX;
+
+	/* Ack */
+	ks8842_write16(adapter, 18, isr, REG_ISR);
+
+	if (!(adapter->conf_flags & MICREL_KS884X))
+		/* Ack in the timberdale IP as well */
+		iowrite32(0x1, adapter->hw_addr + REG_TIMB_IAR);
+
+	if (!netif_running(netdev))
+		return;
+
+	if (isr & IRQ_LINK_CHANGE)
+		ks8842_update_link_status(netdev, adapter);
+
+	/* should not get IRQ_RX when running DMA mode */
+	if (isr & (IRQ_RX | IRQ_RX_ERROR) && !KS8842_USE_DMA(adapter))
+		ks8842_handle_rx(netdev, adapter);
+
+	/* should only happen when in PIO mode */
+	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);
+	if (KS8842_USE_DMA(adapter))
+		ks8842_write16(adapter, 18, ENABLED_IRQS_DMA, REG_IER);
+	else
+		ks8842_write16(adapter, 18, ENABLED_IRQS, REG_IER);
+	iowrite16(entry_bank, adapter->hw_addr + REG_SELECT_BANK);
+
+	/* Make sure timberdale continues DMA operations, they are stopped while
+	   we are handling the ks8842 because we might change bank */
+	if (KS8842_USE_DMA(adapter))
+		ks8842_resume_dma(adapter);
+
+	spin_unlock_irqrestore(&adapter->lock, flags);
+}
+
+static irqreturn_t ks8842_irq(int irq, void *devid)
+{
+	struct net_device *netdev = devid;
+	struct ks8842_adapter *adapter = netdev_priv(netdev);
+	u16 isr;
+	u16 entry_bank = ioread16(adapter->hw_addr + REG_SELECT_BANK);
+	irqreturn_t ret = IRQ_NONE;
+
+	isr = ks8842_read16(adapter, 18, REG_ISR);
+	netdev_dbg(netdev, "%s - ISR: 0x%x\n", __func__, isr);
+
+	if (isr) {
+		if (KS8842_USE_DMA(adapter))
+			/* disable all but RX IRQ, since the FPGA relies on it*/
+			ks8842_write16(adapter, 18, IRQ_RX, REG_IER);
+		else
+			/* 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);
+
+	/* After an interrupt, tell timberdale to continue DMA operations.
+	   DMA is disabled while we are handling the ks8842 because we might
+	   change bank */
+	ks8842_resume_dma(adapter);
+
+	return ret;
+}
+
+static void ks8842_dma_rx_cb(void *data)
+{
+	struct net_device	*netdev = data;
+	struct ks8842_adapter	*adapter = netdev_priv(netdev);
+
+	netdev_dbg(netdev, "RX DMA finished\n");
+	/* schedule tasklet */
+	if (adapter->dma_rx.adesc)
+		tasklet_schedule(&adapter->dma_rx.tasklet);
+}
+
+static void ks8842_dma_tx_cb(void *data)
+{
+	struct net_device		*netdev = data;
+	struct ks8842_adapter		*adapter = netdev_priv(netdev);
+	struct ks8842_tx_dma_ctl	*ctl = &adapter->dma_tx;
+
+	netdev_dbg(netdev, "TX DMA finished\n");
+
+	if (!ctl->adesc)
+		return;
+
+	netdev->stats.tx_packets++;
+	ctl->adesc = NULL;
+
+	if (netif_queue_stopped(netdev))
+		netif_wake_queue(netdev);
+}
+
+static void ks8842_stop_dma(struct ks8842_adapter *adapter)
+{
+	struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx;
+	struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx;
+
+	tx_ctl->adesc = NULL;
+	if (tx_ctl->chan)
+		dmaengine_terminate_all(tx_ctl->chan);
+
+	rx_ctl->adesc = NULL;
+	if (rx_ctl->chan)
+		dmaengine_terminate_all(rx_ctl->chan);
+
+	if (sg_dma_address(&rx_ctl->sg))
+		dma_unmap_single(adapter->dev, sg_dma_address(&rx_ctl->sg),
+			DMA_BUFFER_SIZE, DMA_FROM_DEVICE);
+	sg_dma_address(&rx_ctl->sg) = 0;
+
+	dev_kfree_skb(rx_ctl->skb);
+	rx_ctl->skb = NULL;
+}
+
+static void ks8842_dealloc_dma_bufs(struct ks8842_adapter *adapter)
+{
+	struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx;
+	struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx;
+
+	ks8842_stop_dma(adapter);
+
+	if (tx_ctl->chan)
+		dma_release_channel(tx_ctl->chan);
+	tx_ctl->chan = NULL;
+
+	if (rx_ctl->chan)
+		dma_release_channel(rx_ctl->chan);
+	rx_ctl->chan = NULL;
+
+	tasklet_kill(&rx_ctl->tasklet);
+
+	if (sg_dma_address(&tx_ctl->sg))
+		dma_unmap_single(adapter->dev, sg_dma_address(&tx_ctl->sg),
+			DMA_BUFFER_SIZE, DMA_TO_DEVICE);
+	sg_dma_address(&tx_ctl->sg) = 0;
+
+	kfree(tx_ctl->buf);
+	tx_ctl->buf = NULL;
+}
+
+static bool ks8842_dma_filter_fn(struct dma_chan *chan, void *filter_param)
+{
+	return chan->chan_id == (long)filter_param;
+}
+
+static int ks8842_alloc_dma_bufs(struct net_device *netdev)
+{
+	struct ks8842_adapter *adapter = netdev_priv(netdev);
+	struct ks8842_tx_dma_ctl *tx_ctl = &adapter->dma_tx;
+	struct ks8842_rx_dma_ctl *rx_ctl = &adapter->dma_rx;
+	int err;
+
+	dma_cap_mask_t mask;
+
+	dma_cap_zero(mask);
+	dma_cap_set(DMA_SLAVE, mask);
+	dma_cap_set(DMA_PRIVATE, mask);
+
+	sg_init_table(&tx_ctl->sg, 1);
+
+	tx_ctl->chan = dma_request_channel(mask, ks8842_dma_filter_fn,
+					   (void *)(long)tx_ctl->channel);
+	if (!tx_ctl->chan) {
+		err = -ENODEV;
+		goto err;
+	}
+
+	/* allocate DMA buffer */
+	tx_ctl->buf = kmalloc(DMA_BUFFER_SIZE, GFP_KERNEL);
+	if (!tx_ctl->buf) {
+		err = -ENOMEM;
+		goto err;
+	}
+
+	sg_dma_address(&tx_ctl->sg) = dma_map_single(adapter->dev,
+		tx_ctl->buf, DMA_BUFFER_SIZE, DMA_TO_DEVICE);
+	if (dma_mapping_error(adapter->dev, sg_dma_address(&tx_ctl->sg))) {
+		err = -ENOMEM;
+		sg_dma_address(&tx_ctl->sg) = 0;
+		goto err;
+	}
+
+	rx_ctl->chan = dma_request_channel(mask, ks8842_dma_filter_fn,
+					   (void *)(long)rx_ctl->channel);
+	if (!rx_ctl->chan) {
+		err = -ENODEV;
+		goto err;
+	}
+
+	tasklet_setup(&rx_ctl->tasklet, ks8842_rx_frame_dma_tasklet);
+
+	return 0;
+err:
+	ks8842_dealloc_dma_bufs(adapter);
+	return err;
+}
+
+/* Netdevice operations */
+
+static int ks8842_open(struct net_device *netdev)
+{
+	struct ks8842_adapter *adapter = netdev_priv(netdev);
+	int err;
+
+	netdev_dbg(netdev, "%s - entry\n", __func__);
+
+	if (KS8842_USE_DMA(adapter)) {
+		err = ks8842_alloc_dma_bufs(netdev);
+
+		if (!err) {
+			/* start RX dma */
+			err = __ks8842_start_new_rx_dma(netdev);
+			if (err)
+				ks8842_dealloc_dma_bufs(adapter);
+		}
+
+		if (err) {
+			printk(KERN_WARNING DRV_NAME
+				": Failed to initiate DMA, running PIO\n");
+			ks8842_dealloc_dma_bufs(adapter);
+			adapter->dma_rx.channel = -1;
+			adapter->dma_tx.channel = -1;
+		}
+	}
+
+	/* reset the HW */
+	ks8842_reset_hw(adapter);
+
+	ks8842_write_mac_addr(adapter, netdev->dev_addr);
+
+	ks8842_update_link_status(netdev, adapter);
+
+	err = request_irq(adapter->irq, ks8842_irq, IRQF_SHARED, DRV_NAME,
+		netdev);
+	if (err) {
+		pr_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);
+
+	netdev_dbg(netdev, "%s - entry\n", __func__);
+
+	cancel_work_sync(&adapter->timeout_work);
+
+	if (KS8842_USE_DMA(adapter))
+		ks8842_dealloc_dma_bufs(adapter);
+
+	/* free the irq */
+	free_irq(adapter->irq, netdev);
+
+	/* disable the switch */
+	ks8842_write16(adapter, 32, 0x0, REG_SW_ID_AND_ENABLE);
+
+	return 0;
+}
+
+static netdev_tx_t ks8842_xmit_frame(struct sk_buff *skb,
+				     struct net_device *netdev)
+{
+	int ret;
+	struct ks8842_adapter *adapter = netdev_priv(netdev);
+
+	netdev_dbg(netdev, "%s: entry\n", __func__);
+
+	if (KS8842_USE_DMA(adapter)) {
+		unsigned long flags;
+		ret = ks8842_tx_frame_dma(skb, netdev);
+		/* for now only allow one transfer at the time */
+		spin_lock_irqsave(&adapter->lock, flags);
+		if (adapter->dma_tx.adesc)
+			netif_stop_queue(netdev);
+		spin_unlock_irqrestore(&adapter->lock, flags);
+		return ret;
+	}
+
+	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);
+	struct sockaddr *addr = p;
+	char *mac = (u8 *)addr->sa_data;
+
+	netdev_dbg(netdev, "%s: entry\n", __func__);
+
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EADDRNOTAVAIL;
+
+	memcpy(netdev->dev_addr, mac, netdev->addr_len);
+
+	ks8842_write_mac_addr(adapter, mac);
+	return 0;
+}
+
+static void ks8842_tx_timeout_work(struct work_struct *work)
+{
+	struct ks8842_adapter *adapter =
+		container_of(work, struct ks8842_adapter, timeout_work);
+	struct net_device *netdev = adapter->netdev;
+	unsigned long flags;
+
+	netdev_dbg(netdev, "%s: entry\n", __func__);
+
+	spin_lock_irqsave(&adapter->lock, flags);
+
+	if (KS8842_USE_DMA(adapter))
+		ks8842_stop_dma(adapter);
+
+	/* disable interrupts */
+	ks8842_write16(adapter, 18, 0, REG_IER);
+	ks8842_write16(adapter, 18, 0xFFFF, REG_ISR);
+
+	netif_stop_queue(netdev);
+
+	spin_unlock_irqrestore(&adapter->lock, flags);
+
+	ks8842_reset_hw(adapter);
+
+	ks8842_write_mac_addr(adapter, netdev->dev_addr);
+
+	ks8842_update_link_status(netdev, adapter);
+
+	if (KS8842_USE_DMA(adapter))
+		__ks8842_start_new_rx_dma(netdev);
+}
+
+static void ks8842_tx_timeout(struct net_device *netdev, unsigned int txqueue)
+{
+	struct ks8842_adapter *adapter = netdev_priv(netdev);
+
+	netdev_dbg(netdev, "%s: entry\n", __func__);
+
+	schedule_work(&adapter->timeout_work);
+}
+
+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 const struct ethtool_ops ks8842_ethtool_ops = {
+	.get_link		= ethtool_op_get_link,
+};
+
+static int ks8842_probe(struct platform_device *pdev)
+{
+	int err = -ENOMEM;
+	struct resource *iomem;
+	struct net_device *netdev;
+	struct ks8842_adapter *adapter;
+	struct ks8842_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	u16 id;
+	unsigned i;
+
+	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!iomem) {
+		dev_err(&pdev->dev, "Invalid resource\n");
+		return -EINVAL;
+	}
+	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->netdev = netdev;
+	INIT_WORK(&adapter->timeout_work, ks8842_tx_timeout_work);
+	adapter->hw_addr = ioremap(iomem->start, resource_size(iomem));
+	adapter->conf_flags = iomem->flags;
+
+	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->dev = (pdev->dev.parent) ? pdev->dev.parent : &pdev->dev;
+
+	/* DMA is only supported when accessed via timberdale */
+	if (!(adapter->conf_flags & MICREL_KS884X) && pdata &&
+		(pdata->tx_dma_channel != -1) &&
+		(pdata->rx_dma_channel != -1)) {
+		adapter->dma_rx.channel = pdata->rx_dma_channel;
+		adapter->dma_tx.channel = pdata->tx_dma_channel;
+	} else {
+		adapter->dma_rx.channel = -1;
+		adapter->dma_tx.channel = -1;
+	}
+
+	tasklet_setup(&adapter->tasklet, ks8842_tasklet);
+	spin_lock_init(&adapter->lock);
+
+	netdev->netdev_ops = &ks8842_netdev_ops;
+	netdev->ethtool_ops = &ks8842_ethtool_ops;
+
+	/* Check if a mac address was given */
+	i = netdev->addr_len;
+	if (pdata) {
+		for (i = 0; i < netdev->addr_len; i++)
+			if (pdata->macaddr[i] != 0)
+				break;
+
+		if (i < netdev->addr_len)
+			/* an address was passed, use it */
+			memcpy(netdev->dev_addr, pdata->macaddr,
+				netdev->addr_len);
+	}
+
+	if (i == netdev->addr_len) {
+		ks8842_read_mac_addr(adapter, netdev->dev_addr);
+
+		if (!is_valid_ether_addr(netdev->dev_addr))
+			eth_hw_addr_random(netdev);
+	}
+
+	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);
+
+	pr_info("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 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));
+	return 0;
+}
+
+
+static struct platform_driver ks8842_platform_driver = {
+	.driver = {
+		.name	= DRV_NAME,
+	},
+	.probe		= ks8842_probe,
+	.remove		= ks8842_remove,
+};
+
+module_platform_driver(ks8842_platform_driver);
+
+MODULE_DESCRIPTION("Timberdale KS8842 ethernet driver");
+MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:ks8842");
+
diff --git a/drivers/net/ethernet/micrel/ks8851.h b/drivers/net/ethernet/micrel/ks8851.h
new file mode 100644
index 000000000..0f37448d2
--- /dev/null
+++ b/drivers/net/ethernet/micrel/ks8851.h
@@ -0,0 +1,454 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* drivers/net/ethernet/micrel/ks8851.h
+ *
+ * Copyright 2009 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>
+ *
+ * KS8851 register definitions
+*/
+
+#ifndef __KS8851_H__
+#define __KS8851_H__
+
+#include <linux/eeprom_93cx6.h>
+
+#define KS_CCR					0x08
+#define CCR_LE					(1 << 10)   /* KSZ8851-16MLL */
+#define CCR_EEPROM				(1 << 9)
+#define CCR_SPI					(1 << 8)    /* KSZ8851SNL    */
+#define CCR_8BIT				(1 << 7)    /* KSZ8851-16MLL */
+#define CCR_16BIT				(1 << 6)    /* KSZ8851-16MLL */
+#define CCR_32BIT				(1 << 5)    /* KSZ8851-16MLL */
+#define CCR_SHARED				(1 << 4)    /* KSZ8851-16MLL */
+#define CCR_48PIN				(1 << 1)    /* KSZ8851-16MLL */
+#define CCR_32PIN				(1 << 0)    /* KSZ8851SNL    */
+
+/* MAC address registers */
+#define KS_MAR(_m)				(0x14 - (_m))
+#define KS_MARL					0x10
+#define KS_MARM					0x12
+#define KS_MARH					0x14
+
+#define KS_OBCR					0x20
+#define OBCR_ODS_16mA				(1 << 6)
+
+#define KS_EEPCR				0x22
+#define EEPCR_EESRWA				(1 << 5)
+#define EEPCR_EESA				(1 << 4)
+#define EEPCR_EESB				(1 << 3)
+#define EEPCR_EEDO				(1 << 2)
+#define EEPCR_EESCK				(1 << 1)
+#define EEPCR_EECS				(1 << 0)
+
+#define KS_MBIR					0x24
+#define MBIR_TXMBF				(1 << 12)
+#define MBIR_TXMBFA				(1 << 11)
+#define MBIR_RXMBF				(1 << 4)
+#define MBIR_RXMBFA				(1 << 3)
+
+#define KS_GRR					0x26
+#define GRR_QMU					(1 << 1)
+#define GRR_GSR					(1 << 0)
+
+#define KS_WFCR					0x2A
+#define WFCR_MPRXE				(1 << 7)
+#define WFCR_WF3E				(1 << 3)
+#define WFCR_WF2E				(1 << 2)
+#define WFCR_WF1E				(1 << 1)
+#define WFCR_WF0E				(1 << 0)
+
+#define KS_WF0CRC0				0x30
+#define KS_WF0CRC1				0x32
+#define KS_WF0BM0				0x34
+#define KS_WF0BM1				0x36
+#define KS_WF0BM2				0x38
+#define KS_WF0BM3				0x3A
+
+#define KS_WF1CRC0				0x40
+#define KS_WF1CRC1				0x42
+#define KS_WF1BM0				0x44
+#define KS_WF1BM1				0x46
+#define KS_WF1BM2				0x48
+#define KS_WF1BM3				0x4A
+
+#define KS_WF2CRC0				0x50
+#define KS_WF2CRC1				0x52
+#define KS_WF2BM0				0x54
+#define KS_WF2BM1				0x56
+#define KS_WF2BM2				0x58
+#define KS_WF2BM3				0x5A
+
+#define KS_WF3CRC0				0x60
+#define KS_WF3CRC1				0x62
+#define KS_WF3BM0				0x64
+#define KS_WF3BM1				0x66
+#define KS_WF3BM2				0x68
+#define KS_WF3BM3				0x6A
+
+#define KS_TXCR					0x70
+#define TXCR_TCGICMP				(1 << 8)
+#define TXCR_TCGUDP				(1 << 7)
+#define TXCR_TCGTCP				(1 << 6)
+#define TXCR_TCGIP				(1 << 5)
+#define TXCR_FTXQ				(1 << 4)
+#define TXCR_TXFCE				(1 << 3)
+#define TXCR_TXPE				(1 << 2)
+#define TXCR_TXCRC				(1 << 1)
+#define TXCR_TXE				(1 << 0)
+
+#define KS_TXSR					0x72
+#define TXSR_TXLC				(1 << 13)
+#define TXSR_TXMC				(1 << 12)
+#define TXSR_TXFID_MASK				(0x3f << 0)
+#define TXSR_TXFID_SHIFT			(0)
+#define TXSR_TXFID_GET(_v)			(((_v) >> 0) & 0x3f)
+
+#define KS_RXCR1				0x74
+#define RXCR1_FRXQ				(1 << 15)
+#define RXCR1_RXUDPFCC				(1 << 14)
+#define RXCR1_RXTCPFCC				(1 << 13)
+#define RXCR1_RXIPFCC				(1 << 12)
+#define RXCR1_RXPAFMA				(1 << 11)
+#define RXCR1_RXFCE				(1 << 10)
+#define RXCR1_RXEFE				(1 << 9)
+#define RXCR1_RXMAFMA				(1 << 8)
+#define RXCR1_RXBE				(1 << 7)
+#define RXCR1_RXME				(1 << 6)
+#define RXCR1_RXUE				(1 << 5)
+#define RXCR1_RXAE				(1 << 4)
+#define RXCR1_RXINVF				(1 << 1)
+#define RXCR1_RXE				(1 << 0)
+
+#define KS_RXCR2				0x76
+#define RXCR2_SRDBL_MASK			(0x7 << 5)  /* KSZ8851SNL    */
+#define RXCR2_SRDBL_SHIFT			(5)	    /* KSZ8851SNL    */
+#define RXCR2_SRDBL_4B				(0x0 << 5)  /* KSZ8851SNL    */
+#define RXCR2_SRDBL_8B				(0x1 << 5)  /* KSZ8851SNL    */
+#define RXCR2_SRDBL_16B				(0x2 << 5)  /* KSZ8851SNL    */
+#define RXCR2_SRDBL_32B				(0x3 << 5)  /* KSZ8851SNL    */
+#define RXCR2_SRDBL_FRAME			(0x4 << 5)  /* KSZ8851SNL    */
+#define RXCR2_IUFFP				(1 << 4)
+#define RXCR2_RXIUFCEZ				(1 << 3)
+#define RXCR2_UDPLFE				(1 << 2)
+#define RXCR2_RXICMPFCC				(1 << 1)
+#define RXCR2_RXSAF				(1 << 0)
+
+#define KS_TXMIR				0x78
+
+#define KS_RXFHSR				0x7C
+#define RXFSHR_RXFV				(1 << 15)
+#define RXFSHR_RXICMPFCS			(1 << 13)
+#define RXFSHR_RXIPFCS				(1 << 12)
+#define RXFSHR_RXTCPFCS				(1 << 11)
+#define RXFSHR_RXUDPFCS				(1 << 10)
+#define RXFSHR_RXBF				(1 << 7)
+#define RXFSHR_RXMF				(1 << 6)
+#define RXFSHR_RXUF				(1 << 5)
+#define RXFSHR_RXMR				(1 << 4)
+#define RXFSHR_RXFT				(1 << 3)
+#define RXFSHR_RXFTL				(1 << 2)
+#define RXFSHR_RXRF				(1 << 1)
+#define RXFSHR_RXCE				(1 << 0)
+
+#define KS_RXFHBCR				0x7E
+#define RXFHBCR_CNT_MASK			(0xfff << 0)
+
+#define KS_TXQCR				0x80
+#define TXQCR_AETFE				(1 << 2)    /* KSZ8851SNL    */
+#define TXQCR_TXQMAM				(1 << 1)
+#define TXQCR_METFE				(1 << 0)
+
+#define KS_RXQCR				0x82
+#define RXQCR_RXDTTS				(1 << 12)
+#define RXQCR_RXDBCTS				(1 << 11)
+#define RXQCR_RXFCTS				(1 << 10)
+#define RXQCR_RXIPHTOE				(1 << 9)
+#define RXQCR_RXDTTE				(1 << 7)
+#define RXQCR_RXDBCTE				(1 << 6)
+#define RXQCR_RXFCTE				(1 << 5)
+#define RXQCR_ADRFE				(1 << 4)
+#define RXQCR_SDA				(1 << 3)
+#define RXQCR_RRXEF				(1 << 0)
+
+#define KS_TXFDPR				0x84
+#define TXFDPR_TXFPAI				(1 << 14)
+#define TXFDPR_TXFP_MASK			(0x7ff << 0)
+#define TXFDPR_TXFP_SHIFT			(0)
+
+#define KS_RXFDPR				0x86
+#define RXFDPR_RXFPAI				(1 << 14)
+#define RXFDPR_WST				(1 << 12)   /* KSZ8851-16MLL */
+#define RXFDPR_EMS				(1 << 11)   /* KSZ8851-16MLL */
+#define RXFDPR_RXFP_MASK			(0x7ff << 0)
+#define RXFDPR_RXFP_SHIFT			(0)
+
+#define KS_RXDTTR				0x8C
+#define KS_RXDBCTR				0x8E
+
+#define KS_IER					0x90
+#define KS_ISR					0x92
+#define IRQ_LCI					(1 << 15)
+#define IRQ_TXI					(1 << 14)
+#define IRQ_RXI					(1 << 13)
+#define IRQ_RXOI				(1 << 11)
+#define IRQ_TXPSI				(1 << 9)
+#define IRQ_RXPSI				(1 << 8)
+#define IRQ_TXSAI				(1 << 6)
+#define IRQ_RXWFDI				(1 << 5)
+#define IRQ_RXMPDI				(1 << 4)
+#define IRQ_LDI					(1 << 3)
+#define IRQ_EDI					(1 << 2)
+#define IRQ_SPIBEI				(1 << 1)    /* KSZ8851SNL    */
+#define IRQ_DEDI				(1 << 0)
+
+#define KS_RXFCTR				0x9C
+#define KS_RXFC					0x9D
+#define RXFCTR_RXFC_MASK			(0xff << 8)
+#define RXFCTR_RXFC_SHIFT			(8)
+#define RXFCTR_RXFC_GET(_v)			(((_v) >> 8) & 0xff)
+#define RXFCTR_RXFCT_MASK			(0xff << 0)
+#define RXFCTR_RXFCT_SHIFT			(0)
+
+#define KS_TXNTFSR				0x9E
+
+#define KS_MAHTR0				0xA0
+#define KS_MAHTR1				0xA2
+#define KS_MAHTR2				0xA4
+#define KS_MAHTR3				0xA6
+
+#define KS_FCLWR				0xB0
+#define KS_FCHWR				0xB2
+#define KS_FCOWR				0xB4
+
+#define KS_CIDER				0xC0
+#define CIDER_ID				0x8870
+#define CIDER_REV_MASK				(0x7 << 1)
+#define CIDER_REV_SHIFT				(1)
+#define CIDER_REV_GET(_v)			(((_v) >> 1) & 0x7)
+
+#define KS_CGCR					0xC6
+
+#define KS_IACR					0xC8
+#define IACR_RDEN				(1 << 12)
+#define IACR_TSEL_MASK				(0x3 << 10)
+#define IACR_TSEL_SHIFT				(10)
+#define IACR_TSEL_MIB				(0x3 << 10)
+#define IACR_ADDR_MASK				(0x1f << 0)
+#define IACR_ADDR_SHIFT				(0)
+
+#define KS_IADLR				0xD0
+#define KS_IAHDR				0xD2
+
+#define KS_PMECR				0xD4
+#define PMECR_PME_DELAY				(1 << 14)
+#define PMECR_PME_POL				(1 << 12)
+#define PMECR_WOL_WAKEUP			(1 << 11)
+#define PMECR_WOL_MAGICPKT			(1 << 10)
+#define PMECR_WOL_LINKUP			(1 << 9)
+#define PMECR_WOL_ENERGY			(1 << 8)
+#define PMECR_AUTO_WAKE_EN			(1 << 7)
+#define PMECR_WAKEUP_NORMAL			(1 << 6)
+#define PMECR_WKEVT_MASK			(0xf << 2)
+#define PMECR_WKEVT_SHIFT			(2)
+#define PMECR_WKEVT_GET(_v)			(((_v) >> 2) & 0xf)
+#define PMECR_WKEVT_ENERGY			(0x1 << 2)
+#define PMECR_WKEVT_LINK			(0x2 << 2)
+#define PMECR_WKEVT_MAGICPKT			(0x4 << 2)
+#define PMECR_WKEVT_FRAME			(0x8 << 2)
+#define PMECR_PM_MASK				(0x3 << 0)
+#define PMECR_PM_SHIFT				(0)
+#define PMECR_PM_NORMAL				(0x0 << 0)
+#define PMECR_PM_ENERGY				(0x1 << 0)
+#define PMECR_PM_SOFTDOWN			(0x2 << 0)
+#define PMECR_PM_POWERSAVE			(0x3 << 0)
+
+/* Standard MII PHY data */
+#define KS_P1MBCR				0xE4
+#define KS_P1MBSR				0xE6
+#define KS_PHY1ILR				0xE8
+#define KS_PHY1IHR				0xEA
+#define KS_P1ANAR				0xEC
+#define KS_P1ANLPR				0xEE
+
+#define KS_P1SCLMD				0xF4
+
+#define KS_P1CR					0xF6
+#define P1CR_LEDOFF				(1 << 15)
+#define P1CR_TXIDS				(1 << 14)
+#define P1CR_RESTARTAN				(1 << 13)
+#define P1CR_DISAUTOMDIX			(1 << 10)
+#define P1CR_FORCEMDIX				(1 << 9)
+#define P1CR_AUTONEGEN				(1 << 7)
+#define P1CR_FORCE100				(1 << 6)
+#define P1CR_FORCEFDX				(1 << 5)
+#define P1CR_ADV_FLOW				(1 << 4)
+#define P1CR_ADV_100BT_FDX			(1 << 3)
+#define P1CR_ADV_100BT_HDX			(1 << 2)
+#define P1CR_ADV_10BT_FDX			(1 << 1)
+#define P1CR_ADV_10BT_HDX			(1 << 0)
+
+#define KS_P1SR					0xF8
+#define P1SR_HP_MDIX				(1 << 15)
+#define P1SR_REV_POL				(1 << 13)
+#define P1SR_OP_100M				(1 << 10)
+#define P1SR_OP_FDX				(1 << 9)
+#define P1SR_OP_MDI				(1 << 7)
+#define P1SR_AN_DONE				(1 << 6)
+#define P1SR_LINK_GOOD				(1 << 5)
+#define P1SR_PNTR_FLOW				(1 << 4)
+#define P1SR_PNTR_100BT_FDX			(1 << 3)
+#define P1SR_PNTR_100BT_HDX			(1 << 2)
+#define P1SR_PNTR_10BT_FDX			(1 << 1)
+#define P1SR_PNTR_10BT_HDX			(1 << 0)
+
+/* TX Frame control */
+#define TXFR_TXIC				(1 << 15)
+#define TXFR_TXFID_MASK				(0x3f << 0)
+#define TXFR_TXFID_SHIFT			(0)
+
+/**
+ * struct ks8851_rxctrl - KS8851 driver rx control
+ * @mchash: Multicast hash-table data.
+ * @rxcr1: KS_RXCR1 register setting
+ * @rxcr2: KS_RXCR2 register setting
+ *
+ * Representation of the settings needs to control the receive filtering
+ * such as the multicast hash-filter and the receive register settings. This
+ * is used to make the job of working out if the receive settings change and
+ * then issuing the new settings to the worker that will send the necessary
+ * commands.
+ */
+struct ks8851_rxctrl {
+	u16	mchash[4];
+	u16	rxcr1;
+	u16	rxcr2;
+};
+
+/**
+ * union ks8851_tx_hdr - tx header data
+ * @txb: The header as bytes
+ * @txw: The header as 16bit, little-endian words
+ *
+ * A dual representation of the tx header data to allow
+ * access to individual bytes, and to allow 16bit accesses
+ * with 16bit alignment.
+ */
+union ks8851_tx_hdr {
+	u8	txb[6];
+	__le16	txw[3];
+};
+
+/**
+ * struct ks8851_net - KS8851 driver private data
+ * @netdev: The network device we're bound to
+ * @statelock: Lock on this structure for tx list.
+ * @mii: The MII state information for the mii calls.
+ * @rxctrl: RX settings for @rxctrl_work.
+ * @rxctrl_work: Work queue for updating RX mode and multicast lists
+ * @txq: Queue of packets for transmission.
+ * @txh: Space for generating packet TX header in DMA-able data
+ * @rxd: Space for receiving SPI data, in DMA-able space.
+ * @txd: Space for transmitting SPI data, in DMA-able space.
+ * @msg_enable: The message flags controlling driver output (see ethtool).
+ * @tx_space: Free space in the hardware TX buffer (cached copy of KS_TXMIR).
+ * @queued_len: Space required in hardware TX buffer for queued packets in txq.
+ * @fid: Incrementing frame id tag.
+ * @rc_ier: Cached copy of KS_IER.
+ * @rc_ccr: Cached copy of KS_CCR.
+ * @rc_rxqcr: Cached copy of KS_RXQCR.
+ * @eeprom: 93CX6 EEPROM state for accessing on-board EEPROM.
+ * @vdd_reg:	Optional regulator supplying the chip
+ * @vdd_io: Optional digital power supply for IO
+ * @gpio: Optional reset_n gpio
+ * @lock: Bus access lock callback
+ * @unlock: Bus access unlock callback
+ * @rdreg16: 16bit register read callback
+ * @wrreg16: 16bit register write callback
+ * @rdfifo: FIFO read callback
+ * @wrfifo: FIFO write callback
+ * @start_xmit: start_xmit() implementation callback
+ * @rx_skb: rx_skb() implementation callback
+ * @flush_tx_work: flush_tx_work() implementation callback
+ *
+ * The @statelock is used to protect information in the structure which may
+ * need to be accessed via several sources, such as the network driver layer
+ * or one of the work queues.
+ *
+ * We align the buffers we may use for rx/tx to ensure that if the SPI driver
+ * wants to DMA map them, it will not have any problems with data the driver
+ * modifies.
+ */
+struct ks8851_net {
+	struct net_device	*netdev;
+	spinlock_t		statelock;
+
+	union ks8851_tx_hdr	txh ____cacheline_aligned;
+	u8			rxd[8];
+	u8			txd[8];
+
+	u32			msg_enable ____cacheline_aligned;
+	u16			tx_space;
+	u8			fid;
+
+	u16			rc_ier;
+	u16			rc_rxqcr;
+	u16			rc_ccr;
+
+	struct mii_if_info	mii;
+	struct ks8851_rxctrl	rxctrl;
+
+	struct work_struct	rxctrl_work;
+
+	struct sk_buff_head	txq;
+	unsigned int		queued_len;
+
+	struct eeprom_93cx6	eeprom;
+	struct regulator	*vdd_reg;
+	struct regulator	*vdd_io;
+	int			gpio;
+
+	void			(*lock)(struct ks8851_net *ks,
+					unsigned long *flags);
+	void			(*unlock)(struct ks8851_net *ks,
+					  unsigned long *flags);
+	unsigned int		(*rdreg16)(struct ks8851_net *ks,
+					   unsigned int reg);
+	void			(*wrreg16)(struct ks8851_net *ks,
+					   unsigned int reg, unsigned int val);
+	void			(*rdfifo)(struct ks8851_net *ks, u8 *buff,
+					  unsigned int len);
+	void			(*wrfifo)(struct ks8851_net *ks,
+					  struct sk_buff *txp, bool irq);
+	netdev_tx_t		(*start_xmit)(struct sk_buff *skb,
+					      struct net_device *dev);
+	void			(*rx_skb)(struct ks8851_net *ks,
+					  struct sk_buff *skb);
+	void			(*flush_tx_work)(struct ks8851_net *ks);
+};
+
+int ks8851_probe_common(struct net_device *netdev, struct device *dev,
+			int msg_en);
+int ks8851_remove_common(struct device *dev);
+int ks8851_suspend(struct device *dev);
+int ks8851_resume(struct device *dev);
+
+static __maybe_unused SIMPLE_DEV_PM_OPS(ks8851_pm_ops,
+					ks8851_suspend, ks8851_resume);
+
+/**
+ * ks8851_done_tx - update and then free skbuff after transmitting
+ * @ks: The device state
+ * @txb: The buffer transmitted
+ */
+static void __maybe_unused ks8851_done_tx(struct ks8851_net *ks,
+					  struct sk_buff *txb)
+{
+	struct net_device *dev = ks->netdev;
+
+	dev->stats.tx_bytes += txb->len;
+	dev->stats.tx_packets++;
+
+	dev_kfree_skb(txb);
+}
+
+#endif /* __KS8851_H__ */
diff --git a/drivers/net/ethernet/micrel/ks8851_common.c b/drivers/net/ethernet/micrel/ks8851_common.c
new file mode 100644
index 000000000..3d0ac7f3c
--- /dev/null
+++ b/drivers/net/ethernet/micrel/ks8851_common.c
@@ -0,0 +1,1201 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* drivers/net/ethernet/micrel/ks8851.c
+ *
+ * Copyright 2009 Simtec Electronics
+ *	http://www.simtec.co.uk/
+ *	Ben Dooks <ben@simtec.co.uk>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#define DEBUG
+
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/cache.h>
+#include <linux/crc32.h>
+#include <linux/mii.h>
+#include <linux/regulator/consumer.h>
+
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/of_net.h>
+
+#include "ks8851.h"
+
+/**
+ * ks8851_lock - register access lock
+ * @ks: The chip state
+ * @flags: Spinlock flags
+ *
+ * Claim chip register access lock
+ */
+static void ks8851_lock(struct ks8851_net *ks, unsigned long *flags)
+{
+	ks->lock(ks, flags);
+}
+
+/**
+ * ks8851_unlock - register access unlock
+ * @ks: The chip state
+ * @flags: Spinlock flags
+ *
+ * Release chip register access lock
+ */
+static void ks8851_unlock(struct ks8851_net *ks, unsigned long *flags)
+{
+	ks->unlock(ks, flags);
+}
+
+/**
+ * ks8851_wrreg16 - write 16bit register value to chip
+ * @ks: The chip state
+ * @reg: The register address
+ * @val: The value to write
+ *
+ * Issue a write to put the value @val into the register specified in @reg.
+ */
+static void ks8851_wrreg16(struct ks8851_net *ks, unsigned int reg,
+			   unsigned int val)
+{
+	ks->wrreg16(ks, reg, val);
+}
+
+/**
+ * ks8851_rdreg16 - read 16 bit register from device
+ * @ks: The chip information
+ * @reg: The register address
+ *
+ * Read a 16bit register from the chip, returning the result
+ */
+static unsigned int ks8851_rdreg16(struct ks8851_net *ks,
+				   unsigned int reg)
+{
+	return ks->rdreg16(ks, reg);
+}
+
+/**
+ * ks8851_soft_reset - issue one of the soft reset to the device
+ * @ks: The device state.
+ * @op: The bit(s) to set in the GRR
+ *
+ * Issue the relevant soft-reset command to the device's GRR register
+ * specified by @op.
+ *
+ * Note, the delays are in there as a caution to ensure that the reset
+ * has time to take effect and then complete. Since the datasheet does
+ * not currently specify the exact sequence, we have chosen something
+ * that seems to work with our device.
+ */
+static void ks8851_soft_reset(struct ks8851_net *ks, unsigned op)
+{
+	ks8851_wrreg16(ks, KS_GRR, op);
+	mdelay(1);	/* wait a short time to effect reset */
+	ks8851_wrreg16(ks, KS_GRR, 0);
+	mdelay(1);	/* wait for condition to clear */
+}
+
+/**
+ * ks8851_set_powermode - set power mode of the device
+ * @ks: The device state
+ * @pwrmode: The power mode value to write to KS_PMECR.
+ *
+ * Change the power mode of the chip.
+ */
+static void ks8851_set_powermode(struct ks8851_net *ks, unsigned pwrmode)
+{
+	unsigned pmecr;
+
+	netif_dbg(ks, hw, ks->netdev, "setting power mode %d\n", pwrmode);
+
+	pmecr = ks8851_rdreg16(ks, KS_PMECR);
+	pmecr &= ~PMECR_PM_MASK;
+	pmecr |= pwrmode;
+
+	ks8851_wrreg16(ks, KS_PMECR, pmecr);
+}
+
+/**
+ * ks8851_write_mac_addr - write mac address to device registers
+ * @dev: The network device
+ *
+ * Update the KS8851 MAC address registers from the address in @dev.
+ *
+ * This call assumes that the chip is not running, so there is no need to
+ * shutdown the RXQ process whilst setting this.
+*/
+static int ks8851_write_mac_addr(struct net_device *dev)
+{
+	struct ks8851_net *ks = netdev_priv(dev);
+	unsigned long flags;
+	u16 val;
+	int i;
+
+	ks8851_lock(ks, &flags);
+
+	/*
+	 * Wake up chip in case it was powered off when stopped; otherwise,
+	 * the first write to the MAC address does not take effect.
+	 */
+	ks8851_set_powermode(ks, PMECR_PM_NORMAL);
+
+	for (i = 0; i < ETH_ALEN; i += 2) {
+		val = (dev->dev_addr[i] << 8) | dev->dev_addr[i + 1];
+		ks8851_wrreg16(ks, KS_MAR(i), val);
+	}
+
+	if (!netif_running(dev))
+		ks8851_set_powermode(ks, PMECR_PM_SOFTDOWN);
+
+	ks8851_unlock(ks, &flags);
+
+	return 0;
+}
+
+/**
+ * ks8851_read_mac_addr - read mac address from device registers
+ * @dev: The network device
+ *
+ * Update our copy of the KS8851 MAC address from the registers of @dev.
+*/
+static void ks8851_read_mac_addr(struct net_device *dev)
+{
+	struct ks8851_net *ks = netdev_priv(dev);
+	unsigned long flags;
+	u16 reg;
+	int i;
+
+	ks8851_lock(ks, &flags);
+
+	for (i = 0; i < ETH_ALEN; i += 2) {
+		reg = ks8851_rdreg16(ks, KS_MAR(i));
+		dev->dev_addr[i] = reg >> 8;
+		dev->dev_addr[i + 1] = reg & 0xff;
+	}
+
+	ks8851_unlock(ks, &flags);
+}
+
+/**
+ * ks8851_init_mac - initialise the mac address
+ * @ks: The device structure
+ * @np: The device node pointer
+ *
+ * Get or create the initial mac address for the device and then set that
+ * into the station address register. A mac address supplied in the device
+ * tree takes precedence. Otherwise, if there is an EEPROM present, then
+ * we try that. If no valid mac address is found we use eth_random_addr()
+ * to create a new one.
+ */
+static void ks8851_init_mac(struct ks8851_net *ks, struct device_node *np)
+{
+	struct net_device *dev = ks->netdev;
+	const u8 *mac_addr;
+
+	mac_addr = of_get_mac_address(np);
+	if (!IS_ERR(mac_addr)) {
+		ether_addr_copy(dev->dev_addr, mac_addr);
+		ks8851_write_mac_addr(dev);
+		return;
+	}
+
+	if (ks->rc_ccr & CCR_EEPROM) {
+		ks8851_read_mac_addr(dev);
+		if (is_valid_ether_addr(dev->dev_addr))
+			return;
+
+		netdev_err(ks->netdev, "invalid mac address read %pM\n",
+				dev->dev_addr);
+	}
+
+	eth_hw_addr_random(dev);
+	ks8851_write_mac_addr(dev);
+}
+
+/**
+ * ks8851_dbg_dumpkkt - dump initial packet contents to debug
+ * @ks: The device state
+ * @rxpkt: The data for the received packet
+ *
+ * Dump the initial data from the packet to dev_dbg().
+ */
+static void ks8851_dbg_dumpkkt(struct ks8851_net *ks, u8 *rxpkt)
+{
+	netdev_dbg(ks->netdev,
+		   "pkt %02x%02x%02x%02x %02x%02x%02x%02x %02x%02x%02x%02x\n",
+		   rxpkt[4], rxpkt[5], rxpkt[6], rxpkt[7],
+		   rxpkt[8], rxpkt[9], rxpkt[10], rxpkt[11],
+		   rxpkt[12], rxpkt[13], rxpkt[14], rxpkt[15]);
+}
+
+/**
+ * ks8851_rx_skb - receive skbuff
+ * @ks: The device state.
+ * @skb: The skbuff
+ */
+static void ks8851_rx_skb(struct ks8851_net *ks, struct sk_buff *skb)
+{
+	ks->rx_skb(ks, skb);
+}
+
+/**
+ * ks8851_rx_pkts - receive packets from the host
+ * @ks: The device information.
+ *
+ * This is called from the IRQ work queue when the system detects that there
+ * are packets in the receive queue. Find out how many packets there are and
+ * read them from the FIFO.
+ */
+static void ks8851_rx_pkts(struct ks8851_net *ks)
+{
+	struct sk_buff *skb;
+	unsigned rxfc;
+	unsigned rxlen;
+	unsigned rxstat;
+	u8 *rxpkt;
+
+	rxfc = (ks8851_rdreg16(ks, KS_RXFCTR) >> 8) & 0xff;
+
+	netif_dbg(ks, rx_status, ks->netdev,
+		  "%s: %d packets\n", __func__, rxfc);
+
+	/* Currently we're issuing a read per packet, but we could possibly
+	 * improve the code by issuing a single read, getting the receive
+	 * header, allocating the packet and then reading the packet data
+	 * out in one go.
+	 *
+	 * This form of operation would require us to hold the SPI bus'
+	 * chipselect low during the entie transaction to avoid any
+	 * reset to the data stream coming from the chip.
+	 */
+
+	for (; rxfc != 0; rxfc--) {
+		rxstat = ks8851_rdreg16(ks, KS_RXFHSR);
+		rxlen = ks8851_rdreg16(ks, KS_RXFHBCR) & RXFHBCR_CNT_MASK;
+
+		netif_dbg(ks, rx_status, ks->netdev,
+			  "rx: stat 0x%04x, len 0x%04x\n", rxstat, rxlen);
+
+		/* the length of the packet includes the 32bit CRC */
+
+		/* set dma read address */
+		ks8851_wrreg16(ks, KS_RXFDPR, RXFDPR_RXFPAI | 0x00);
+
+		/* start DMA access */
+		ks8851_wrreg16(ks, KS_RXQCR, ks->rc_rxqcr | RXQCR_SDA);
+
+		if (rxlen > 4) {
+			unsigned int rxalign;
+
+			rxlen -= 4;
+			rxalign = ALIGN(rxlen, 4);
+			skb = netdev_alloc_skb_ip_align(ks->netdev, rxalign);
+			if (skb) {
+
+				/* 4 bytes of status header + 4 bytes of
+				 * garbage: we put them before ethernet
+				 * header, so that they are copied,
+				 * but ignored.
+				 */
+
+				rxpkt = skb_put(skb, rxlen) - 8;
+
+				ks->rdfifo(ks, rxpkt, rxalign + 8);
+
+				if (netif_msg_pktdata(ks))
+					ks8851_dbg_dumpkkt(ks, rxpkt);
+
+				skb->protocol = eth_type_trans(skb, ks->netdev);
+				ks8851_rx_skb(ks, skb);
+
+				ks->netdev->stats.rx_packets++;
+				ks->netdev->stats.rx_bytes += rxlen;
+			}
+		}
+
+		/* end DMA access and dequeue packet */
+		ks8851_wrreg16(ks, KS_RXQCR, ks->rc_rxqcr | RXQCR_RRXEF);
+	}
+}
+
+/**
+ * ks8851_irq - IRQ handler for dealing with interrupt requests
+ * @irq: IRQ number
+ * @_ks: cookie
+ *
+ * This handler is invoked when the IRQ line asserts to find out what happened.
+ * As we cannot allow ourselves to sleep in HARDIRQ context, this handler runs
+ * in thread context.
+ *
+ * Read the interrupt status, work out what needs to be done and then clear
+ * any of the interrupts that are not needed.
+ */
+static irqreturn_t ks8851_irq(int irq, void *_ks)
+{
+	struct ks8851_net *ks = _ks;
+	unsigned handled = 0;
+	unsigned long flags;
+	unsigned int status;
+
+	ks8851_lock(ks, &flags);
+
+	status = ks8851_rdreg16(ks, KS_ISR);
+
+	netif_dbg(ks, intr, ks->netdev,
+		  "%s: status 0x%04x\n", __func__, status);
+
+	if (status & IRQ_LCI)
+		handled |= IRQ_LCI;
+
+	if (status & IRQ_LDI) {
+		u16 pmecr = ks8851_rdreg16(ks, KS_PMECR);
+		pmecr &= ~PMECR_WKEVT_MASK;
+		ks8851_wrreg16(ks, KS_PMECR, pmecr | PMECR_WKEVT_LINK);
+
+		handled |= IRQ_LDI;
+	}
+
+	if (status & IRQ_RXPSI)
+		handled |= IRQ_RXPSI;
+
+	if (status & IRQ_TXI) {
+		unsigned short tx_space = ks8851_rdreg16(ks, KS_TXMIR);
+
+		netif_dbg(ks, intr, ks->netdev,
+			  "%s: txspace %d\n", __func__, tx_space);
+
+		spin_lock(&ks->statelock);
+		ks->tx_space = tx_space;
+		if (netif_queue_stopped(ks->netdev))
+			netif_wake_queue(ks->netdev);
+		spin_unlock(&ks->statelock);
+
+		handled |= IRQ_TXI;
+	}
+
+	if (status & IRQ_RXI)
+		handled |= IRQ_RXI;
+
+	if (status & IRQ_SPIBEI) {
+		netdev_err(ks->netdev, "%s: spi bus error\n", __func__);
+		handled |= IRQ_SPIBEI;
+	}
+
+	ks8851_wrreg16(ks, KS_ISR, handled);
+
+	if (status & IRQ_RXI) {
+		/* the datasheet says to disable the rx interrupt during
+		 * packet read-out, however we're masking the interrupt
+		 * from the device so do not bother masking just the RX
+		 * from the device. */
+
+		ks8851_rx_pkts(ks);
+	}
+
+	/* if something stopped the rx process, probably due to wanting
+	 * to change the rx settings, then do something about restarting
+	 * it. */
+	if (status & IRQ_RXPSI) {
+		struct ks8851_rxctrl *rxc = &ks->rxctrl;
+
+		/* update the multicast hash table */
+		ks8851_wrreg16(ks, KS_MAHTR0, rxc->mchash[0]);
+		ks8851_wrreg16(ks, KS_MAHTR1, rxc->mchash[1]);
+		ks8851_wrreg16(ks, KS_MAHTR2, rxc->mchash[2]);
+		ks8851_wrreg16(ks, KS_MAHTR3, rxc->mchash[3]);
+
+		ks8851_wrreg16(ks, KS_RXCR2, rxc->rxcr2);
+		ks8851_wrreg16(ks, KS_RXCR1, rxc->rxcr1);
+	}
+
+	ks8851_unlock(ks, &flags);
+
+	if (status & IRQ_LCI)
+		mii_check_link(&ks->mii);
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * ks8851_flush_tx_work - flush outstanding TX work
+ * @ks: The device state
+ */
+static void ks8851_flush_tx_work(struct ks8851_net *ks)
+{
+	if (ks->flush_tx_work)
+		ks->flush_tx_work(ks);
+}
+
+/**
+ * ks8851_net_open - open network device
+ * @dev: The network device being opened.
+ *
+ * Called when the network device is marked active, such as a user executing
+ * 'ifconfig up' on the device.
+ */
+static int ks8851_net_open(struct net_device *dev)
+{
+	struct ks8851_net *ks = netdev_priv(dev);
+	unsigned long flags;
+	int ret;
+
+	ret = request_threaded_irq(dev->irq, NULL, ks8851_irq,
+				   IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+				   dev->name, ks);
+	if (ret < 0) {
+		netdev_err(dev, "failed to get irq\n");
+		return ret;
+	}
+
+	/* lock the card, even if we may not actually be doing anything
+	 * else at the moment */
+	ks8851_lock(ks, &flags);
+
+	netif_dbg(ks, ifup, ks->netdev, "opening\n");
+
+	/* bring chip out of any power saving mode it was in */
+	ks8851_set_powermode(ks, PMECR_PM_NORMAL);
+
+	/* issue a soft reset to the RX/TX QMU to put it into a known
+	 * state. */
+	ks8851_soft_reset(ks, GRR_QMU);
+
+	/* setup transmission parameters */
+
+	ks8851_wrreg16(ks, KS_TXCR, (TXCR_TXE | /* enable transmit process */
+				     TXCR_TXPE | /* pad to min length */
+				     TXCR_TXCRC | /* add CRC */
+				     TXCR_TXFCE)); /* enable flow control */
+
+	/* auto-increment tx data, reset tx pointer */
+	ks8851_wrreg16(ks, KS_TXFDPR, TXFDPR_TXFPAI);
+
+	/* setup receiver control */
+
+	ks8851_wrreg16(ks, KS_RXCR1, (RXCR1_RXPAFMA | /*  from mac filter */
+				      RXCR1_RXFCE | /* enable flow control */
+				      RXCR1_RXBE | /* broadcast enable */
+				      RXCR1_RXUE | /* unicast enable */
+				      RXCR1_RXE)); /* enable rx block */
+
+	/* transfer entire frames out in one go */
+	ks8851_wrreg16(ks, KS_RXCR2, RXCR2_SRDBL_FRAME);
+
+	/* set receive counter timeouts */
+	ks8851_wrreg16(ks, KS_RXDTTR, 1000); /* 1ms after first frame to IRQ */
+	ks8851_wrreg16(ks, KS_RXDBCTR, 4096); /* >4Kbytes in buffer to IRQ */
+	ks8851_wrreg16(ks, KS_RXFCTR, 10);  /* 10 frames to IRQ */
+
+	ks->rc_rxqcr = (RXQCR_RXFCTE |  /* IRQ on frame count exceeded */
+			RXQCR_RXDBCTE | /* IRQ on byte count exceeded */
+			RXQCR_RXDTTE);  /* IRQ on time exceeded */
+
+	ks8851_wrreg16(ks, KS_RXQCR, ks->rc_rxqcr);
+
+	/* clear then enable interrupts */
+	ks8851_wrreg16(ks, KS_ISR, ks->rc_ier);
+	ks8851_wrreg16(ks, KS_IER, ks->rc_ier);
+
+	ks->queued_len = 0;
+	netif_start_queue(ks->netdev);
+
+	netif_dbg(ks, ifup, ks->netdev, "network device up\n");
+
+	ks8851_unlock(ks, &flags);
+	mii_check_link(&ks->mii);
+	return 0;
+}
+
+/**
+ * ks8851_net_stop - close network device
+ * @dev: The device being closed.
+ *
+ * Called to close down a network device which has been active. Cancell any
+ * work, shutdown the RX and TX process and then place the chip into a low
+ * power state whilst it is not being used.
+ */
+static int ks8851_net_stop(struct net_device *dev)
+{
+	struct ks8851_net *ks = netdev_priv(dev);
+	unsigned long flags;
+
+	netif_info(ks, ifdown, dev, "shutting down\n");
+
+	netif_stop_queue(dev);
+
+	ks8851_lock(ks, &flags);
+	/* turn off the IRQs and ack any outstanding */
+	ks8851_wrreg16(ks, KS_IER, 0x0000);
+	ks8851_wrreg16(ks, KS_ISR, 0xffff);
+	ks8851_unlock(ks, &flags);
+
+	/* stop any outstanding work */
+	ks8851_flush_tx_work(ks);
+	flush_work(&ks->rxctrl_work);
+
+	ks8851_lock(ks, &flags);
+	/* shutdown RX process */
+	ks8851_wrreg16(ks, KS_RXCR1, 0x0000);
+
+	/* shutdown TX process */
+	ks8851_wrreg16(ks, KS_TXCR, 0x0000);
+
+	/* set powermode to soft power down to save power */
+	ks8851_set_powermode(ks, PMECR_PM_SOFTDOWN);
+	ks8851_unlock(ks, &flags);
+
+	/* ensure any queued tx buffers are dumped */
+	while (!skb_queue_empty(&ks->txq)) {
+		struct sk_buff *txb = skb_dequeue(&ks->txq);
+
+		netif_dbg(ks, ifdown, ks->netdev,
+			  "%s: freeing txb %p\n", __func__, txb);
+
+		dev_kfree_skb(txb);
+	}
+
+	free_irq(dev->irq, ks);
+
+	return 0;
+}
+
+/**
+ * ks8851_start_xmit - transmit packet
+ * @skb: The buffer to transmit
+ * @dev: The device used to transmit the packet.
+ *
+ * Called by the network layer to transmit the @skb. Queue the packet for
+ * the device and schedule the necessary work to transmit the packet when
+ * it is free.
+ *
+ * We do this to firstly avoid sleeping with the network device locked,
+ * and secondly so we can round up more than one packet to transmit which
+ * means we can try and avoid generating too many transmit done interrupts.
+ */
+static netdev_tx_t ks8851_start_xmit(struct sk_buff *skb,
+				     struct net_device *dev)
+{
+	struct ks8851_net *ks = netdev_priv(dev);
+
+	return ks->start_xmit(skb, dev);
+}
+
+/**
+ * ks8851_rxctrl_work - work handler to change rx mode
+ * @work: The work structure this belongs to.
+ *
+ * Lock the device and issue the necessary changes to the receive mode from
+ * the network device layer. This is done so that we can do this without
+ * having to sleep whilst holding the network device lock.
+ *
+ * Since the recommendation from Micrel is that the RXQ is shutdown whilst the
+ * receive parameters are programmed, we issue a write to disable the RXQ and
+ * then wait for the interrupt handler to be triggered once the RXQ shutdown is
+ * complete. The interrupt handler then writes the new values into the chip.
+ */
+static void ks8851_rxctrl_work(struct work_struct *work)
+{
+	struct ks8851_net *ks = container_of(work, struct ks8851_net, rxctrl_work);
+	unsigned long flags;
+
+	ks8851_lock(ks, &flags);
+
+	/* need to shutdown RXQ before modifying filter parameters */
+	ks8851_wrreg16(ks, KS_RXCR1, 0x00);
+
+	ks8851_unlock(ks, &flags);
+}
+
+static void ks8851_set_rx_mode(struct net_device *dev)
+{
+	struct ks8851_net *ks = netdev_priv(dev);
+	struct ks8851_rxctrl rxctrl;
+
+	memset(&rxctrl, 0, sizeof(rxctrl));
+
+	if (dev->flags & IFF_PROMISC) {
+		/* interface to receive everything */
+
+		rxctrl.rxcr1 = RXCR1_RXAE | RXCR1_RXINVF;
+	} else if (dev->flags & IFF_ALLMULTI) {
+		/* accept all multicast packets */
+
+		rxctrl.rxcr1 = (RXCR1_RXME | RXCR1_RXAE |
+				RXCR1_RXPAFMA | RXCR1_RXMAFMA);
+	} else if (dev->flags & IFF_MULTICAST && !netdev_mc_empty(dev)) {
+		struct netdev_hw_addr *ha;
+		u32 crc;
+
+		/* accept some multicast */
+
+		netdev_for_each_mc_addr(ha, dev) {
+			crc = ether_crc(ETH_ALEN, ha->addr);
+			crc >>= (32 - 6);  /* get top six bits */
+
+			rxctrl.mchash[crc >> 4] |= (1 << (crc & 0xf));
+		}
+
+		rxctrl.rxcr1 = RXCR1_RXME | RXCR1_RXPAFMA;
+	} else {
+		/* just accept broadcast / unicast */
+		rxctrl.rxcr1 = RXCR1_RXPAFMA;
+	}
+
+	rxctrl.rxcr1 |= (RXCR1_RXUE | /* unicast enable */
+			 RXCR1_RXBE | /* broadcast enable */
+			 RXCR1_RXE | /* RX process enable */
+			 RXCR1_RXFCE); /* enable flow control */
+
+	rxctrl.rxcr2 |= RXCR2_SRDBL_FRAME;
+
+	/* schedule work to do the actual set of the data if needed */
+
+	spin_lock(&ks->statelock);
+
+	if (memcmp(&rxctrl, &ks->rxctrl, sizeof(rxctrl)) != 0) {
+		memcpy(&ks->rxctrl, &rxctrl, sizeof(ks->rxctrl));
+		schedule_work(&ks->rxctrl_work);
+	}
+
+	spin_unlock(&ks->statelock);
+}
+
+static int ks8851_set_mac_address(struct net_device *dev, void *addr)
+{
+	struct sockaddr *sa = addr;
+
+	if (netif_running(dev))
+		return -EBUSY;
+
+	if (!is_valid_ether_addr(sa->sa_data))
+		return -EADDRNOTAVAIL;
+
+	memcpy(dev->dev_addr, sa->sa_data, ETH_ALEN);
+	return ks8851_write_mac_addr(dev);
+}
+
+static int ks8851_net_ioctl(struct net_device *dev, struct ifreq *req, int cmd)
+{
+	struct ks8851_net *ks = netdev_priv(dev);
+
+	if (!netif_running(dev))
+		return -EINVAL;
+
+	return generic_mii_ioctl(&ks->mii, if_mii(req), cmd, NULL);
+}
+
+static const struct net_device_ops ks8851_netdev_ops = {
+	.ndo_open		= ks8851_net_open,
+	.ndo_stop		= ks8851_net_stop,
+	.ndo_do_ioctl		= ks8851_net_ioctl,
+	.ndo_start_xmit		= ks8851_start_xmit,
+	.ndo_set_mac_address	= ks8851_set_mac_address,
+	.ndo_set_rx_mode	= ks8851_set_rx_mode,
+	.ndo_validate_addr	= eth_validate_addr,
+};
+
+/* ethtool support */
+
+static void ks8851_get_drvinfo(struct net_device *dev,
+			       struct ethtool_drvinfo *di)
+{
+	strlcpy(di->driver, "KS8851", sizeof(di->driver));
+	strlcpy(di->version, "1.00", sizeof(di->version));
+	strlcpy(di->bus_info, dev_name(dev->dev.parent), sizeof(di->bus_info));
+}
+
+static u32 ks8851_get_msglevel(struct net_device *dev)
+{
+	struct ks8851_net *ks = netdev_priv(dev);
+	return ks->msg_enable;
+}
+
+static void ks8851_set_msglevel(struct net_device *dev, u32 to)
+{
+	struct ks8851_net *ks = netdev_priv(dev);
+	ks->msg_enable = to;
+}
+
+static int ks8851_get_link_ksettings(struct net_device *dev,
+				     struct ethtool_link_ksettings *cmd)
+{
+	struct ks8851_net *ks = netdev_priv(dev);
+
+	mii_ethtool_get_link_ksettings(&ks->mii, cmd);
+
+	return 0;
+}
+
+static int ks8851_set_link_ksettings(struct net_device *dev,
+				     const struct ethtool_link_ksettings *cmd)
+{
+	struct ks8851_net *ks = netdev_priv(dev);
+	return mii_ethtool_set_link_ksettings(&ks->mii, cmd);
+}
+
+static u32 ks8851_get_link(struct net_device *dev)
+{
+	struct ks8851_net *ks = netdev_priv(dev);
+	return mii_link_ok(&ks->mii);
+}
+
+static int ks8851_nway_reset(struct net_device *dev)
+{
+	struct ks8851_net *ks = netdev_priv(dev);
+	return mii_nway_restart(&ks->mii);
+}
+
+/* EEPROM support */
+
+static void ks8851_eeprom_regread(struct eeprom_93cx6 *ee)
+{
+	struct ks8851_net *ks = ee->data;
+	unsigned val;
+
+	val = ks8851_rdreg16(ks, KS_EEPCR);
+
+	ee->reg_data_out = (val & EEPCR_EESB) ? 1 : 0;
+	ee->reg_data_clock = (val & EEPCR_EESCK) ? 1 : 0;
+	ee->reg_chip_select = (val & EEPCR_EECS) ? 1 : 0;
+}
+
+static void ks8851_eeprom_regwrite(struct eeprom_93cx6 *ee)
+{
+	struct ks8851_net *ks = ee->data;
+	unsigned val = EEPCR_EESA;	/* default - eeprom access on */
+
+	if (ee->drive_data)
+		val |= EEPCR_EESRWA;
+	if (ee->reg_data_in)
+		val |= EEPCR_EEDO;
+	if (ee->reg_data_clock)
+		val |= EEPCR_EESCK;
+	if (ee->reg_chip_select)
+		val |= EEPCR_EECS;
+
+	ks8851_wrreg16(ks, KS_EEPCR, val);
+}
+
+/**
+ * ks8851_eeprom_claim - claim device EEPROM and activate the interface
+ * @ks: The network device state.
+ *
+ * Check for the presence of an EEPROM, and then activate software access
+ * to the device.
+ */
+static int ks8851_eeprom_claim(struct ks8851_net *ks)
+{
+	/* start with clock low, cs high */
+	ks8851_wrreg16(ks, KS_EEPCR, EEPCR_EESA | EEPCR_EECS);
+	return 0;
+}
+
+/**
+ * ks8851_eeprom_release - release the EEPROM interface
+ * @ks: The device state
+ *
+ * Release the software access to the device EEPROM
+ */
+static void ks8851_eeprom_release(struct ks8851_net *ks)
+{
+	unsigned val = ks8851_rdreg16(ks, KS_EEPCR);
+
+	ks8851_wrreg16(ks, KS_EEPCR, val & ~EEPCR_EESA);
+}
+
+#define KS_EEPROM_MAGIC (0x00008851)
+
+static int ks8851_set_eeprom(struct net_device *dev,
+			     struct ethtool_eeprom *ee, u8 *data)
+{
+	struct ks8851_net *ks = netdev_priv(dev);
+	int offset = ee->offset;
+	unsigned long flags;
+	int len = ee->len;
+	u16 tmp;
+
+	/* currently only support byte writing */
+	if (len != 1)
+		return -EINVAL;
+
+	if (ee->magic != KS_EEPROM_MAGIC)
+		return -EINVAL;
+
+	if (!(ks->rc_ccr & CCR_EEPROM))
+		return -ENOENT;
+
+	ks8851_lock(ks, &flags);
+
+	ks8851_eeprom_claim(ks);
+
+	eeprom_93cx6_wren(&ks->eeprom, true);
+
+	/* ethtool currently only supports writing bytes, which means
+	 * we have to read/modify/write our 16bit EEPROMs */
+
+	eeprom_93cx6_read(&ks->eeprom, offset/2, &tmp);
+
+	if (offset & 1) {
+		tmp &= 0xff;
+		tmp |= *data << 8;
+	} else {
+		tmp &= 0xff00;
+		tmp |= *data;
+	}
+
+	eeprom_93cx6_write(&ks->eeprom, offset/2, tmp);
+	eeprom_93cx6_wren(&ks->eeprom, false);
+
+	ks8851_eeprom_release(ks);
+	ks8851_unlock(ks, &flags);
+
+	return 0;
+}
+
+static int ks8851_get_eeprom(struct net_device *dev,
+			     struct ethtool_eeprom *ee, u8 *data)
+{
+	struct ks8851_net *ks = netdev_priv(dev);
+	int offset = ee->offset;
+	unsigned long flags;
+	int len = ee->len;
+
+	/* must be 2 byte aligned */
+	if (len & 1 || offset & 1)
+		return -EINVAL;
+
+	if (!(ks->rc_ccr & CCR_EEPROM))
+		return -ENOENT;
+
+	ks8851_lock(ks, &flags);
+
+	ks8851_eeprom_claim(ks);
+
+	ee->magic = KS_EEPROM_MAGIC;
+
+	eeprom_93cx6_multiread(&ks->eeprom, offset/2, (__le16 *)data, len/2);
+	ks8851_eeprom_release(ks);
+	ks8851_unlock(ks, &flags);
+
+	return 0;
+}
+
+static int ks8851_get_eeprom_len(struct net_device *dev)
+{
+	struct ks8851_net *ks = netdev_priv(dev);
+
+	/* currently, we assume it is an 93C46 attached, so return 128 */
+	return ks->rc_ccr & CCR_EEPROM ? 128 : 0;
+}
+
+static const struct ethtool_ops ks8851_ethtool_ops = {
+	.get_drvinfo	= ks8851_get_drvinfo,
+	.get_msglevel	= ks8851_get_msglevel,
+	.set_msglevel	= ks8851_set_msglevel,
+	.get_link	= ks8851_get_link,
+	.nway_reset	= ks8851_nway_reset,
+	.get_eeprom_len	= ks8851_get_eeprom_len,
+	.get_eeprom	= ks8851_get_eeprom,
+	.set_eeprom	= ks8851_set_eeprom,
+	.get_link_ksettings = ks8851_get_link_ksettings,
+	.set_link_ksettings = ks8851_set_link_ksettings,
+};
+
+/* MII interface controls */
+
+/**
+ * ks8851_phy_reg - convert MII register into a KS8851 register
+ * @reg: MII register number.
+ *
+ * Return the KS8851 register number for the corresponding MII PHY register
+ * if possible. Return zero if the MII register has no direct mapping to the
+ * KS8851 register set.
+ */
+static int ks8851_phy_reg(int reg)
+{
+	switch (reg) {
+	case MII_BMCR:
+		return KS_P1MBCR;
+	case MII_BMSR:
+		return KS_P1MBSR;
+	case MII_PHYSID1:
+		return KS_PHY1ILR;
+	case MII_PHYSID2:
+		return KS_PHY1IHR;
+	case MII_ADVERTISE:
+		return KS_P1ANAR;
+	case MII_LPA:
+		return KS_P1ANLPR;
+	}
+
+	return 0x0;
+}
+
+/**
+ * ks8851_phy_read - MII interface PHY register read.
+ * @dev: The network device the PHY is on.
+ * @phy_addr: Address of PHY (ignored as we only have one)
+ * @reg: The register to read.
+ *
+ * This call reads data from the PHY register specified in @reg. Since the
+ * device does not support all the MII registers, the non-existent values
+ * are always returned as zero.
+ *
+ * We return zero for unsupported registers as the MII code does not check
+ * the value returned for any error status, and simply returns it to the
+ * caller. The mii-tool that the driver was tested with takes any -ve error
+ * as real PHY capabilities, thus displaying incorrect data to the user.
+ */
+static int ks8851_phy_read(struct net_device *dev, int phy_addr, int reg)
+{
+	struct ks8851_net *ks = netdev_priv(dev);
+	unsigned long flags;
+	int ksreg;
+	int result;
+
+	ksreg = ks8851_phy_reg(reg);
+	if (!ksreg)
+		return 0x0;	/* no error return allowed, so use zero */
+
+	ks8851_lock(ks, &flags);
+	result = ks8851_rdreg16(ks, ksreg);
+	ks8851_unlock(ks, &flags);
+
+	return result;
+}
+
+static void ks8851_phy_write(struct net_device *dev,
+			     int phy, int reg, int value)
+{
+	struct ks8851_net *ks = netdev_priv(dev);
+	unsigned long flags;
+	int ksreg;
+
+	ksreg = ks8851_phy_reg(reg);
+	if (ksreg) {
+		ks8851_lock(ks, &flags);
+		ks8851_wrreg16(ks, ksreg, value);
+		ks8851_unlock(ks, &flags);
+	}
+}
+
+/**
+ * ks8851_read_selftest - read the selftest memory info.
+ * @ks: The device state
+ *
+ * Read and check the TX/RX memory selftest information.
+ */
+static int ks8851_read_selftest(struct ks8851_net *ks)
+{
+	unsigned both_done = MBIR_TXMBF | MBIR_RXMBF;
+	int ret = 0;
+	unsigned rd;
+
+	rd = ks8851_rdreg16(ks, KS_MBIR);
+
+	if ((rd & both_done) != both_done) {
+		netdev_warn(ks->netdev, "Memory selftest not finished\n");
+		return 0;
+	}
+
+	if (rd & MBIR_TXMBFA) {
+		netdev_err(ks->netdev, "TX memory selftest fail\n");
+		ret |= 1;
+	}
+
+	if (rd & MBIR_RXMBFA) {
+		netdev_err(ks->netdev, "RX memory selftest fail\n");
+		ret |= 2;
+	}
+
+	return 0;
+}
+
+/* driver bus management functions */
+
+#ifdef CONFIG_PM_SLEEP
+
+int ks8851_suspend(struct device *dev)
+{
+	struct ks8851_net *ks = dev_get_drvdata(dev);
+	struct net_device *netdev = ks->netdev;
+
+	if (netif_running(netdev)) {
+		netif_device_detach(netdev);
+		ks8851_net_stop(netdev);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ks8851_suspend);
+
+int ks8851_resume(struct device *dev)
+{
+	struct ks8851_net *ks = dev_get_drvdata(dev);
+	struct net_device *netdev = ks->netdev;
+
+	if (netif_running(netdev)) {
+		ks8851_net_open(netdev);
+		netif_device_attach(netdev);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ks8851_resume);
+#endif
+
+int ks8851_probe_common(struct net_device *netdev, struct device *dev,
+			int msg_en)
+{
+	struct ks8851_net *ks = netdev_priv(netdev);
+	unsigned cider;
+	int gpio;
+	int ret;
+
+	ks->netdev = netdev;
+	ks->tx_space = 6144;
+
+	gpio = of_get_named_gpio_flags(dev->of_node, "reset-gpios", 0, NULL);
+	if (gpio == -EPROBE_DEFER)
+		return gpio;
+
+	ks->gpio = gpio;
+	if (gpio_is_valid(gpio)) {
+		ret = devm_gpio_request_one(dev, gpio,
+					    GPIOF_OUT_INIT_LOW, "ks8851_rst_n");
+		if (ret) {
+			dev_err(dev, "reset gpio request failed\n");
+			return ret;
+		}
+	}
+
+	ks->vdd_io = devm_regulator_get(dev, "vdd-io");
+	if (IS_ERR(ks->vdd_io)) {
+		ret = PTR_ERR(ks->vdd_io);
+		goto err_reg_io;
+	}
+
+	ret = regulator_enable(ks->vdd_io);
+	if (ret) {
+		dev_err(dev, "regulator vdd_io enable fail: %d\n", ret);
+		goto err_reg_io;
+	}
+
+	ks->vdd_reg = devm_regulator_get(dev, "vdd");
+	if (IS_ERR(ks->vdd_reg)) {
+		ret = PTR_ERR(ks->vdd_reg);
+		goto err_reg;
+	}
+
+	ret = regulator_enable(ks->vdd_reg);
+	if (ret) {
+		dev_err(dev, "regulator vdd enable fail: %d\n", ret);
+		goto err_reg;
+	}
+
+	if (gpio_is_valid(gpio)) {
+		usleep_range(10000, 11000);
+		gpio_set_value(gpio, 1);
+	}
+
+	spin_lock_init(&ks->statelock);
+
+	INIT_WORK(&ks->rxctrl_work, ks8851_rxctrl_work);
+
+	/* setup EEPROM state */
+	ks->eeprom.data = ks;
+	ks->eeprom.width = PCI_EEPROM_WIDTH_93C46;
+	ks->eeprom.register_read = ks8851_eeprom_regread;
+	ks->eeprom.register_write = ks8851_eeprom_regwrite;
+
+	/* setup mii state */
+	ks->mii.dev		= netdev;
+	ks->mii.phy_id		= 1,
+	ks->mii.phy_id_mask	= 1;
+	ks->mii.reg_num_mask	= 0xf;
+	ks->mii.mdio_read	= ks8851_phy_read;
+	ks->mii.mdio_write	= ks8851_phy_write;
+
+	dev_info(dev, "message enable is %d\n", msg_en);
+
+	/* set the default message enable */
+	ks->msg_enable = netif_msg_init(msg_en, NETIF_MSG_DRV |
+						NETIF_MSG_PROBE |
+						NETIF_MSG_LINK);
+
+	skb_queue_head_init(&ks->txq);
+
+	netdev->ethtool_ops = &ks8851_ethtool_ops;
+	SET_NETDEV_DEV(netdev, dev);
+
+	dev_set_drvdata(dev, ks);
+
+	netif_carrier_off(ks->netdev);
+	netdev->if_port = IF_PORT_100BASET;
+	netdev->netdev_ops = &ks8851_netdev_ops;
+
+	/* issue a global soft reset to reset the device. */
+	ks8851_soft_reset(ks, GRR_GSR);
+
+	/* simple check for a valid chip being connected to the bus */
+	cider = ks8851_rdreg16(ks, KS_CIDER);
+	if ((cider & ~CIDER_REV_MASK) != CIDER_ID) {
+		dev_err(dev, "failed to read device ID\n");
+		ret = -ENODEV;
+		goto err_id;
+	}
+
+	/* cache the contents of the CCR register for EEPROM, etc. */
+	ks->rc_ccr = ks8851_rdreg16(ks, KS_CCR);
+
+	ks8851_read_selftest(ks);
+	ks8851_init_mac(ks, dev->of_node);
+
+	ret = register_netdev(netdev);
+	if (ret) {
+		dev_err(dev, "failed to register network device\n");
+		goto err_netdev;
+	}
+
+	netdev_info(netdev, "revision %d, MAC %pM, IRQ %d, %s EEPROM\n",
+		    CIDER_REV_GET(cider), netdev->dev_addr, netdev->irq,
+		    ks->rc_ccr & CCR_EEPROM ? "has" : "no");
+
+	return 0;
+
+err_netdev:
+err_id:
+	if (gpio_is_valid(gpio))
+		gpio_set_value(gpio, 0);
+	regulator_disable(ks->vdd_reg);
+err_reg:
+	regulator_disable(ks->vdd_io);
+err_reg_io:
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ks8851_probe_common);
+
+int ks8851_remove_common(struct device *dev)
+{
+	struct ks8851_net *priv = dev_get_drvdata(dev);
+
+	if (netif_msg_drv(priv))
+		dev_info(dev, "remove\n");
+
+	unregister_netdev(priv->netdev);
+	if (gpio_is_valid(priv->gpio))
+		gpio_set_value(priv->gpio, 0);
+	regulator_disable(priv->vdd_reg);
+	regulator_disable(priv->vdd_io);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ks8851_remove_common);
+
+MODULE_DESCRIPTION("KS8851 Network driver");
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/net/ethernet/micrel/ks8851_par.c b/drivers/net/ethernet/micrel/ks8851_par.c
new file mode 100644
index 000000000..c7c99cc54
--- /dev/null
+++ b/drivers/net/ethernet/micrel/ks8851_par.c
@@ -0,0 +1,359 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* drivers/net/ethernet/micrel/ks8851.c
+ *
+ * Copyright 2009 Simtec Electronics
+ *	http://www.simtec.co.uk/
+ *	Ben Dooks <ben@simtec.co.uk>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#define DEBUG
+
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/iopoll.h>
+#include <linux/mii.h>
+
+#include <linux/platform_device.h>
+#include <linux/of_net.h>
+
+#include "ks8851.h"
+
+static int msg_enable;
+
+#define BE3             0x8000      /* Byte Enable 3 */
+#define BE2             0x4000      /* Byte Enable 2 */
+#define BE1             0x2000      /* Byte Enable 1 */
+#define BE0             0x1000      /* Byte Enable 0 */
+
+/**
+ * struct ks8851_net_par - KS8851 Parallel driver private data
+ * @ks8851: KS8851 driver common private data
+ * @lock: Lock to ensure that the device is not accessed when busy.
+ * @hw_addr	: start address of data register.
+ * @hw_addr_cmd	: start address of command register.
+ * @cmd_reg_cache	: command register cached.
+ *
+ * The @lock ensures that the chip is protected when certain operations are
+ * in progress. When the read or write packet transfer is in progress, most
+ * of the chip registers are not accessible until the transfer is finished
+ * and the DMA has been de-asserted.
+ */
+struct ks8851_net_par {
+	struct ks8851_net	ks8851;
+	spinlock_t		lock;
+	void __iomem		*hw_addr;
+	void __iomem		*hw_addr_cmd;
+	u16			cmd_reg_cache;
+};
+
+#define to_ks8851_par(ks) container_of((ks), struct ks8851_net_par, ks8851)
+
+/**
+ * ks8851_lock_par - register access lock
+ * @ks: The chip state
+ * @flags: Spinlock flags
+ *
+ * Claim chip register access lock
+ */
+static void ks8851_lock_par(struct ks8851_net *ks, unsigned long *flags)
+{
+	struct ks8851_net_par *ksp = to_ks8851_par(ks);
+
+	spin_lock_irqsave(&ksp->lock, *flags);
+}
+
+/**
+ * ks8851_unlock_par - register access unlock
+ * @ks: The chip state
+ * @flags: Spinlock flags
+ *
+ * Release chip register access lock
+ */
+static void ks8851_unlock_par(struct ks8851_net *ks, unsigned long *flags)
+{
+	struct ks8851_net_par *ksp = to_ks8851_par(ks);
+
+	spin_unlock_irqrestore(&ksp->lock, *flags);
+}
+
+/**
+ * ks_check_endian - Check whether endianness of the bus is correct
+ * @ks	  : The chip information
+ *
+ * The KS8851-16MLL EESK pin allows selecting the endianness of the 16bit
+ * bus. To maintain optimum performance, the bus endianness should be set
+ * such that it matches the endianness of the CPU.
+ */
+static int ks_check_endian(struct ks8851_net *ks)
+{
+	struct ks8851_net_par *ksp = to_ks8851_par(ks);
+	u16 cider;
+
+	/*
+	 * Read CIDER register first, however read it the "wrong" way around.
+	 * If the endian strap on the KS8851-16MLL in incorrect and the chip
+	 * is operating in different endianness than the CPU, then the meaning
+	 * of BE[3:0] byte-enable bits is also swapped such that:
+	 *    BE[3,2,1,0] becomes BE[1,0,3,2]
+	 *
+	 * Luckily for us, the byte-enable bits are the top four MSbits of
+	 * the address register and the CIDER register is at offset 0xc0.
+	 * Hence, by reading address 0xc0c0, which is not impacted by endian
+	 * swapping, we assert either BE[3:2] or BE[1:0] while reading the
+	 * CIDER register.
+	 *
+	 * If the bus configuration is correct, reading 0xc0c0 asserts
+	 * BE[3:2] and this read returns 0x0000, because to read register
+	 * with bottom two LSbits of address set to 0, BE[1:0] must be
+	 * asserted.
+	 *
+	 * If the bus configuration is NOT correct, reading 0xc0c0 asserts
+	 * BE[1:0] and this read returns non-zero 0x8872 value.
+	 */
+	iowrite16(BE3 | BE2 | KS_CIDER, ksp->hw_addr_cmd);
+	cider = ioread16(ksp->hw_addr);
+	if (!cider)
+		return 0;
+
+	netdev_err(ks->netdev, "incorrect EESK endian strap setting\n");
+
+	return -EINVAL;
+}
+
+/**
+ * ks8851_wrreg16_par - write 16bit register value to chip
+ * @ks: The chip state
+ * @reg: The register address
+ * @val: The value to write
+ *
+ * Issue a write to put the value @val into the register specified in @reg.
+ */
+static void ks8851_wrreg16_par(struct ks8851_net *ks, unsigned int reg,
+			       unsigned int val)
+{
+	struct ks8851_net_par *ksp = to_ks8851_par(ks);
+
+	ksp->cmd_reg_cache = (u16)reg | ((BE1 | BE0) << (reg & 0x02));
+	iowrite16(ksp->cmd_reg_cache, ksp->hw_addr_cmd);
+	iowrite16(val, ksp->hw_addr);
+}
+
+/**
+ * ks8851_rdreg16_par - read 16 bit register from chip
+ * @ks: The chip information
+ * @reg: The register address
+ *
+ * Read a 16bit register from the chip, returning the result
+ */
+static unsigned int ks8851_rdreg16_par(struct ks8851_net *ks, unsigned int reg)
+{
+	struct ks8851_net_par *ksp = to_ks8851_par(ks);
+
+	ksp->cmd_reg_cache = (u16)reg | ((BE1 | BE0) << (reg & 0x02));
+	iowrite16(ksp->cmd_reg_cache, ksp->hw_addr_cmd);
+	return ioread16(ksp->hw_addr);
+}
+
+/**
+ * ks8851_rdfifo_par - read data from the receive fifo
+ * @ks: The device state.
+ * @buff: The buffer address
+ * @len: The length of the data to read
+ *
+ * Issue an RXQ FIFO read command and read the @len amount of data from
+ * the FIFO into the buffer specified by @buff.
+ */
+static void ks8851_rdfifo_par(struct ks8851_net *ks, u8 *buff, unsigned int len)
+{
+	struct ks8851_net_par *ksp = to_ks8851_par(ks);
+
+	netif_dbg(ks, rx_status, ks->netdev,
+		  "%s: %d@%p\n", __func__, len, buff);
+
+	ioread16_rep(ksp->hw_addr, (u16 *)buff + 1, len / 2);
+}
+
+/**
+ * ks8851_wrfifo_par - write packet to TX FIFO
+ * @ks: The device state.
+ * @txp: The sk_buff to transmit.
+ * @irq: IRQ on completion of the packet.
+ *
+ * Send the @txp to the chip. This means creating the relevant packet header
+ * specifying the length of the packet and the other information the chip
+ * needs, such as IRQ on completion. Send the header and the packet data to
+ * the device.
+ */
+static void ks8851_wrfifo_par(struct ks8851_net *ks, struct sk_buff *txp,
+			      bool irq)
+{
+	struct ks8851_net_par *ksp = to_ks8851_par(ks);
+	unsigned int len = ALIGN(txp->len, 4);
+	unsigned int fid = 0;
+
+	netif_dbg(ks, tx_queued, ks->netdev, "%s: skb %p, %d@%p, irq %d\n",
+		  __func__, txp, txp->len, txp->data, irq);
+
+	fid = ks->fid++;
+	fid &= TXFR_TXFID_MASK;
+
+	if (irq)
+		fid |= TXFR_TXIC;	/* irq on completion */
+
+	iowrite16(fid, ksp->hw_addr);
+	iowrite16(txp->len, ksp->hw_addr);
+
+	iowrite16_rep(ksp->hw_addr, txp->data, len / 2);
+}
+
+/**
+ * ks8851_rx_skb_par - receive skbuff
+ * @ks: The device state.
+ * @skb: The skbuff
+ */
+static void ks8851_rx_skb_par(struct ks8851_net *ks, struct sk_buff *skb)
+{
+	netif_rx(skb);
+}
+
+static unsigned int ks8851_rdreg16_par_txqcr(struct ks8851_net *ks)
+{
+	return ks8851_rdreg16_par(ks, KS_TXQCR);
+}
+
+/**
+ * ks8851_start_xmit_par - transmit packet
+ * @skb: The buffer to transmit
+ * @dev: The device used to transmit the packet.
+ *
+ * Called by the network layer to transmit the @skb. Queue the packet for
+ * the device and schedule the necessary work to transmit the packet when
+ * it is free.
+ *
+ * We do this to firstly avoid sleeping with the network device locked,
+ * and secondly so we can round up more than one packet to transmit which
+ * means we can try and avoid generating too many transmit done interrupts.
+ */
+static netdev_tx_t ks8851_start_xmit_par(struct sk_buff *skb,
+					 struct net_device *dev)
+{
+	struct ks8851_net *ks = netdev_priv(dev);
+	netdev_tx_t ret = NETDEV_TX_OK;
+	unsigned long flags;
+	unsigned int txqcr;
+	u16 txmir;
+	int err;
+
+	netif_dbg(ks, tx_queued, ks->netdev,
+		  "%s: skb %p, %d@%p\n", __func__, skb, skb->len, skb->data);
+
+	ks8851_lock_par(ks, &flags);
+
+	txmir = ks8851_rdreg16_par(ks, KS_TXMIR) & 0x1fff;
+
+	if (likely(txmir >= skb->len + 12)) {
+		ks8851_wrreg16_par(ks, KS_RXQCR, ks->rc_rxqcr | RXQCR_SDA);
+		ks8851_wrfifo_par(ks, skb, false);
+		ks8851_wrreg16_par(ks, KS_RXQCR, ks->rc_rxqcr);
+		ks8851_wrreg16_par(ks, KS_TXQCR, TXQCR_METFE);
+
+		err = readx_poll_timeout_atomic(ks8851_rdreg16_par_txqcr, ks,
+						txqcr, !(txqcr & TXQCR_METFE),
+						5, 1000000);
+		if (err)
+			ret = NETDEV_TX_BUSY;
+
+		ks8851_done_tx(ks, skb);
+	} else {
+		ret = NETDEV_TX_BUSY;
+	}
+
+	ks8851_unlock_par(ks, &flags);
+
+	return ret;
+}
+
+static int ks8851_probe_par(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct ks8851_net_par *ksp;
+	struct net_device *netdev;
+	struct ks8851_net *ks;
+	int ret;
+
+	netdev = devm_alloc_etherdev(dev, sizeof(struct ks8851_net_par));
+	if (!netdev)
+		return -ENOMEM;
+
+	ks = netdev_priv(netdev);
+
+	ks->lock = ks8851_lock_par;
+	ks->unlock = ks8851_unlock_par;
+	ks->rdreg16 = ks8851_rdreg16_par;
+	ks->wrreg16 = ks8851_wrreg16_par;
+	ks->rdfifo = ks8851_rdfifo_par;
+	ks->wrfifo = ks8851_wrfifo_par;
+	ks->start_xmit = ks8851_start_xmit_par;
+	ks->rx_skb = ks8851_rx_skb_par;
+
+#define STD_IRQ (IRQ_LCI |	/* Link Change */	\
+		 IRQ_RXI |	/* RX done */		\
+		 IRQ_RXPSI)	/* RX process stop */
+	ks->rc_ier = STD_IRQ;
+
+	ksp = to_ks8851_par(ks);
+	spin_lock_init(&ksp->lock);
+
+	ksp->hw_addr = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(ksp->hw_addr))
+		return PTR_ERR(ksp->hw_addr);
+
+	ksp->hw_addr_cmd = devm_platform_ioremap_resource(pdev, 1);
+	if (IS_ERR(ksp->hw_addr_cmd))
+		return PTR_ERR(ksp->hw_addr_cmd);
+
+	ret = ks_check_endian(ks);
+	if (ret)
+		return ret;
+
+	netdev->irq = platform_get_irq(pdev, 0);
+	if (netdev->irq < 0)
+		return netdev->irq;
+
+	return ks8851_probe_common(netdev, dev, msg_enable);
+}
+
+static int ks8851_remove_par(struct platform_device *pdev)
+{
+	return ks8851_remove_common(&pdev->dev);
+}
+
+static const struct of_device_id ks8851_match_table[] = {
+	{ .compatible = "micrel,ks8851-mll" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ks8851_match_table);
+
+static struct platform_driver ks8851_driver = {
+	.driver = {
+		.name = "ks8851",
+		.of_match_table = ks8851_match_table,
+		.pm = &ks8851_pm_ops,
+	},
+	.probe = ks8851_probe_par,
+	.remove = ks8851_remove_par,
+};
+module_platform_driver(ks8851_driver);
+
+MODULE_DESCRIPTION("KS8851 Network driver");
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_LICENSE("GPL");
+
+module_param_named(message, msg_enable, int, 0);
+MODULE_PARM_DESC(message, "Message verbosity level (0=none, 31=all)");
diff --git a/drivers/net/ethernet/micrel/ks8851_spi.c b/drivers/net/ethernet/micrel/ks8851_spi.c
new file mode 100644
index 000000000..8fb5a4cd2
--- /dev/null
+++ b/drivers/net/ethernet/micrel/ks8851_spi.c
@@ -0,0 +1,497 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* drivers/net/ethernet/micrel/ks8851.c
+ *
+ * Copyright 2009 Simtec Electronics
+ *	http://www.simtec.co.uk/
+ *	Ben Dooks <ben@simtec.co.uk>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#define DEBUG
+
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/cache.h>
+#include <linux/crc32.h>
+#include <linux/mii.h>
+#include <linux/regulator/consumer.h>
+
+#include <linux/spi/spi.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/of_net.h>
+
+#include "ks8851.h"
+
+static int msg_enable;
+
+/**
+ * struct ks8851_net_spi - KS8851 SPI driver private data
+ * @lock: Lock to ensure that the device is not accessed when busy.
+ * @tx_work: Work queue for tx packets
+ * @ks8851: KS8851 driver common private data
+ * @spidev: The spi device we're bound to.
+ * @spi_msg1: pre-setup SPI transfer with one message, @spi_xfer1.
+ * @spi_msg2: pre-setup SPI transfer with two messages, @spi_xfer2.
+ * @spi_xfer1: @spi_msg1 SPI transfer structure
+ * @spi_xfer2: @spi_msg2 SPI transfer structure
+ *
+ * The @lock ensures that the chip is protected when certain operations are
+ * in progress. When the read or write packet transfer is in progress, most
+ * of the chip registers are not ccessible until the transfer is finished and
+ * the DMA has been de-asserted.
+ */
+struct ks8851_net_spi {
+	struct ks8851_net	ks8851;
+	struct mutex		lock;
+	struct work_struct	tx_work;
+	struct spi_device	*spidev;
+	struct spi_message	spi_msg1;
+	struct spi_message	spi_msg2;
+	struct spi_transfer	spi_xfer1;
+	struct spi_transfer	spi_xfer2[2];
+};
+
+#define to_ks8851_spi(ks) container_of((ks), struct ks8851_net_spi, ks8851)
+
+/* SPI frame opcodes */
+#define KS_SPIOP_RD	0x00
+#define KS_SPIOP_WR	0x40
+#define KS_SPIOP_RXFIFO	0x80
+#define KS_SPIOP_TXFIFO	0xC0
+
+/* shift for byte-enable data */
+#define BYTE_EN(_x)	((_x) << 2)
+
+/* turn register number and byte-enable mask into data for start of packet */
+#define MK_OP(_byteen, _reg)	\
+	(BYTE_EN(_byteen) | (_reg) << (8 + 2) | (_reg) >> 6)
+
+/**
+ * ks8851_lock_spi - register access lock
+ * @ks: The chip state
+ * @flags: Spinlock flags
+ *
+ * Claim chip register access lock
+ */
+static void ks8851_lock_spi(struct ks8851_net *ks, unsigned long *flags)
+{
+	struct ks8851_net_spi *kss = to_ks8851_spi(ks);
+
+	mutex_lock(&kss->lock);
+}
+
+/**
+ * ks8851_unlock_spi - register access unlock
+ * @ks: The chip state
+ * @flags: Spinlock flags
+ *
+ * Release chip register access lock
+ */
+static void ks8851_unlock_spi(struct ks8851_net *ks, unsigned long *flags)
+{
+	struct ks8851_net_spi *kss = to_ks8851_spi(ks);
+
+	mutex_unlock(&kss->lock);
+}
+
+/* SPI register read/write calls.
+ *
+ * All these calls issue SPI transactions to access the chip's registers. They
+ * all require that the necessary lock is held to prevent accesses when the
+ * chip is busy transferring packet data (RX/TX FIFO accesses).
+ */
+
+/**
+ * ks8851_wrreg16_spi - write 16bit register value to chip via SPI
+ * @ks: The chip state
+ * @reg: The register address
+ * @val: The value to write
+ *
+ * Issue a write to put the value @val into the register specified in @reg.
+ */
+static void ks8851_wrreg16_spi(struct ks8851_net *ks, unsigned int reg,
+			       unsigned int val)
+{
+	struct ks8851_net_spi *kss = to_ks8851_spi(ks);
+	struct spi_transfer *xfer = &kss->spi_xfer1;
+	struct spi_message *msg = &kss->spi_msg1;
+	__le16 txb[2];
+	int ret;
+
+	txb[0] = cpu_to_le16(MK_OP(reg & 2 ? 0xC : 0x03, reg) | KS_SPIOP_WR);
+	txb[1] = cpu_to_le16(val);
+
+	xfer->tx_buf = txb;
+	xfer->rx_buf = NULL;
+	xfer->len = 4;
+
+	ret = spi_sync(kss->spidev, msg);
+	if (ret < 0)
+		netdev_err(ks->netdev, "spi_sync() failed\n");
+}
+
+/**
+ * ks8851_rdreg - issue read register command and return the data
+ * @ks: The device state
+ * @op: The register address and byte enables in message format.
+ * @rxb: The RX buffer to return the result into
+ * @rxl: The length of data expected.
+ *
+ * This is the low level read call that issues the necessary spi message(s)
+ * to read data from the register specified in @op.
+ */
+static void ks8851_rdreg(struct ks8851_net *ks, unsigned int op,
+			 u8 *rxb, unsigned int rxl)
+{
+	struct ks8851_net_spi *kss = to_ks8851_spi(ks);
+	struct spi_transfer *xfer;
+	struct spi_message *msg;
+	__le16 *txb = (__le16 *)ks->txd;
+	u8 *trx = ks->rxd;
+	int ret;
+
+	txb[0] = cpu_to_le16(op | KS_SPIOP_RD);
+
+	if (kss->spidev->master->flags & SPI_MASTER_HALF_DUPLEX) {
+		msg = &kss->spi_msg2;
+		xfer = kss->spi_xfer2;
+
+		xfer->tx_buf = txb;
+		xfer->rx_buf = NULL;
+		xfer->len = 2;
+
+		xfer++;
+		xfer->tx_buf = NULL;
+		xfer->rx_buf = trx;
+		xfer->len = rxl;
+	} else {
+		msg = &kss->spi_msg1;
+		xfer = &kss->spi_xfer1;
+
+		xfer->tx_buf = txb;
+		xfer->rx_buf = trx;
+		xfer->len = rxl + 2;
+	}
+
+	ret = spi_sync(kss->spidev, msg);
+	if (ret < 0)
+		netdev_err(ks->netdev, "read: spi_sync() failed\n");
+	else if (kss->spidev->master->flags & SPI_MASTER_HALF_DUPLEX)
+		memcpy(rxb, trx, rxl);
+	else
+		memcpy(rxb, trx + 2, rxl);
+}
+
+/**
+ * ks8851_rdreg16_spi - read 16 bit register from device via SPI
+ * @ks: The chip information
+ * @reg: The register address
+ *
+ * Read a 16bit register from the chip, returning the result
+ */
+static unsigned int ks8851_rdreg16_spi(struct ks8851_net *ks, unsigned int reg)
+{
+	__le16 rx = 0;
+
+	ks8851_rdreg(ks, MK_OP(reg & 2 ? 0xC : 0x3, reg), (u8 *)&rx, 2);
+	return le16_to_cpu(rx);
+}
+
+/**
+ * ks8851_rdfifo_spi - read data from the receive fifo via SPI
+ * @ks: The device state.
+ * @buff: The buffer address
+ * @len: The length of the data to read
+ *
+ * Issue an RXQ FIFO read command and read the @len amount of data from
+ * the FIFO into the buffer specified by @buff.
+ */
+static void ks8851_rdfifo_spi(struct ks8851_net *ks, u8 *buff, unsigned int len)
+{
+	struct ks8851_net_spi *kss = to_ks8851_spi(ks);
+	struct spi_transfer *xfer = kss->spi_xfer2;
+	struct spi_message *msg = &kss->spi_msg2;
+	u8 txb[1];
+	int ret;
+
+	netif_dbg(ks, rx_status, ks->netdev,
+		  "%s: %d@%p\n", __func__, len, buff);
+
+	/* set the operation we're issuing */
+	txb[0] = KS_SPIOP_RXFIFO;
+
+	xfer->tx_buf = txb;
+	xfer->rx_buf = NULL;
+	xfer->len = 1;
+
+	xfer++;
+	xfer->rx_buf = buff;
+	xfer->tx_buf = NULL;
+	xfer->len = len;
+
+	ret = spi_sync(kss->spidev, msg);
+	if (ret < 0)
+		netdev_err(ks->netdev, "%s: spi_sync() failed\n", __func__);
+}
+
+/**
+ * ks8851_wrfifo_spi - write packet to TX FIFO via SPI
+ * @ks: The device state.
+ * @txp: The sk_buff to transmit.
+ * @irq: IRQ on completion of the packet.
+ *
+ * Send the @txp to the chip. This means creating the relevant packet header
+ * specifying the length of the packet and the other information the chip
+ * needs, such as IRQ on completion. Send the header and the packet data to
+ * the device.
+ */
+static void ks8851_wrfifo_spi(struct ks8851_net *ks, struct sk_buff *txp,
+			      bool irq)
+{
+	struct ks8851_net_spi *kss = to_ks8851_spi(ks);
+	struct spi_transfer *xfer = kss->spi_xfer2;
+	struct spi_message *msg = &kss->spi_msg2;
+	unsigned int fid = 0;
+	int ret;
+
+	netif_dbg(ks, tx_queued, ks->netdev, "%s: skb %p, %d@%p, irq %d\n",
+		  __func__, txp, txp->len, txp->data, irq);
+
+	fid = ks->fid++;
+	fid &= TXFR_TXFID_MASK;
+
+	if (irq)
+		fid |= TXFR_TXIC;	/* irq on completion */
+
+	/* start header at txb[1] to align txw entries */
+	ks->txh.txb[1] = KS_SPIOP_TXFIFO;
+	ks->txh.txw[1] = cpu_to_le16(fid);
+	ks->txh.txw[2] = cpu_to_le16(txp->len);
+
+	xfer->tx_buf = &ks->txh.txb[1];
+	xfer->rx_buf = NULL;
+	xfer->len = 5;
+
+	xfer++;
+	xfer->tx_buf = txp->data;
+	xfer->rx_buf = NULL;
+	xfer->len = ALIGN(txp->len, 4);
+
+	ret = spi_sync(kss->spidev, msg);
+	if (ret < 0)
+		netdev_err(ks->netdev, "%s: spi_sync() failed\n", __func__);
+}
+
+/**
+ * calc_txlen - calculate size of message to send packet
+ * @len: Length of data
+ *
+ * Returns the size of the TXFIFO message needed to send
+ * this packet.
+ */
+static unsigned int calc_txlen(unsigned int len)
+{
+	return ALIGN(len + 4, 4);
+}
+
+/**
+ * ks8851_rx_skb_spi - receive skbuff
+ * @ks: The device state
+ * @skb: The skbuff
+ */
+static void ks8851_rx_skb_spi(struct ks8851_net *ks, struct sk_buff *skb)
+{
+	netif_rx_ni(skb);
+}
+
+/**
+ * ks8851_tx_work - process tx packet(s)
+ * @work: The work strucutre what was scheduled.
+ *
+ * This is called when a number of packets have been scheduled for
+ * transmission and need to be sent to the device.
+ */
+static void ks8851_tx_work(struct work_struct *work)
+{
+	unsigned int dequeued_len = 0;
+	struct ks8851_net_spi *kss;
+	unsigned short tx_space;
+	struct ks8851_net *ks;
+	unsigned long flags;
+	struct sk_buff *txb;
+	bool last;
+
+	kss = container_of(work, struct ks8851_net_spi, tx_work);
+	ks = &kss->ks8851;
+	last = skb_queue_empty(&ks->txq);
+
+	ks8851_lock_spi(ks, &flags);
+
+	while (!last) {
+		txb = skb_dequeue(&ks->txq);
+		last = skb_queue_empty(&ks->txq);
+
+		if (txb) {
+			dequeued_len += calc_txlen(txb->len);
+
+			ks8851_wrreg16_spi(ks, KS_RXQCR,
+					   ks->rc_rxqcr | RXQCR_SDA);
+			ks8851_wrfifo_spi(ks, txb, last);
+			ks8851_wrreg16_spi(ks, KS_RXQCR, ks->rc_rxqcr);
+			ks8851_wrreg16_spi(ks, KS_TXQCR, TXQCR_METFE);
+
+			ks8851_done_tx(ks, txb);
+		}
+	}
+
+	tx_space = ks8851_rdreg16_spi(ks, KS_TXMIR);
+
+	spin_lock(&ks->statelock);
+	ks->queued_len -= dequeued_len;
+	ks->tx_space = tx_space;
+	spin_unlock(&ks->statelock);
+
+	ks8851_unlock_spi(ks, &flags);
+}
+
+/**
+ * ks8851_flush_tx_work_spi - flush outstanding TX work
+ * @ks: The device state
+ */
+static void ks8851_flush_tx_work_spi(struct ks8851_net *ks)
+{
+	struct ks8851_net_spi *kss = to_ks8851_spi(ks);
+
+	flush_work(&kss->tx_work);
+}
+
+/**
+ * ks8851_start_xmit_spi - transmit packet using SPI
+ * @skb: The buffer to transmit
+ * @dev: The device used to transmit the packet.
+ *
+ * Called by the network layer to transmit the @skb. Queue the packet for
+ * the device and schedule the necessary work to transmit the packet when
+ * it is free.
+ *
+ * We do this to firstly avoid sleeping with the network device locked,
+ * and secondly so we can round up more than one packet to transmit which
+ * means we can try and avoid generating too many transmit done interrupts.
+ */
+static netdev_tx_t ks8851_start_xmit_spi(struct sk_buff *skb,
+					 struct net_device *dev)
+{
+	unsigned int needed = calc_txlen(skb->len);
+	struct ks8851_net *ks = netdev_priv(dev);
+	netdev_tx_t ret = NETDEV_TX_OK;
+	struct ks8851_net_spi *kss;
+
+	kss = to_ks8851_spi(ks);
+
+	netif_dbg(ks, tx_queued, ks->netdev,
+		  "%s: skb %p, %d@%p\n", __func__, skb, skb->len, skb->data);
+
+	spin_lock(&ks->statelock);
+
+	if (ks->queued_len + needed > ks->tx_space) {
+		netif_stop_queue(dev);
+		ret = NETDEV_TX_BUSY;
+	} else {
+		ks->queued_len += needed;
+		skb_queue_tail(&ks->txq, skb);
+	}
+
+	spin_unlock(&ks->statelock);
+	if (ret == NETDEV_TX_OK)
+		schedule_work(&kss->tx_work);
+
+	return ret;
+}
+
+static int ks8851_probe_spi(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct ks8851_net_spi *kss;
+	struct net_device *netdev;
+	struct ks8851_net *ks;
+
+	netdev = devm_alloc_etherdev(dev, sizeof(struct ks8851_net_spi));
+	if (!netdev)
+		return -ENOMEM;
+
+	spi->bits_per_word = 8;
+
+	ks = netdev_priv(netdev);
+
+	ks->lock = ks8851_lock_spi;
+	ks->unlock = ks8851_unlock_spi;
+	ks->rdreg16 = ks8851_rdreg16_spi;
+	ks->wrreg16 = ks8851_wrreg16_spi;
+	ks->rdfifo = ks8851_rdfifo_spi;
+	ks->wrfifo = ks8851_wrfifo_spi;
+	ks->start_xmit = ks8851_start_xmit_spi;
+	ks->rx_skb = ks8851_rx_skb_spi;
+	ks->flush_tx_work = ks8851_flush_tx_work_spi;
+
+#define STD_IRQ (IRQ_LCI |	/* Link Change */	\
+		 IRQ_TXI |	/* TX done */		\
+		 IRQ_RXI |	/* RX done */		\
+		 IRQ_SPIBEI |	/* SPI bus error */	\
+		 IRQ_TXPSI |	/* TX process stop */	\
+		 IRQ_RXPSI)	/* RX process stop */
+	ks->rc_ier = STD_IRQ;
+
+	kss = to_ks8851_spi(ks);
+
+	kss->spidev = spi;
+	mutex_init(&kss->lock);
+	INIT_WORK(&kss->tx_work, ks8851_tx_work);
+
+	/* initialise pre-made spi transfer messages */
+	spi_message_init(&kss->spi_msg1);
+	spi_message_add_tail(&kss->spi_xfer1, &kss->spi_msg1);
+
+	spi_message_init(&kss->spi_msg2);
+	spi_message_add_tail(&kss->spi_xfer2[0], &kss->spi_msg2);
+	spi_message_add_tail(&kss->spi_xfer2[1], &kss->spi_msg2);
+
+	netdev->irq = spi->irq;
+
+	return ks8851_probe_common(netdev, dev, msg_enable);
+}
+
+static int ks8851_remove_spi(struct spi_device *spi)
+{
+	return ks8851_remove_common(&spi->dev);
+}
+
+static const struct of_device_id ks8851_match_table[] = {
+	{ .compatible = "micrel,ks8851" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ks8851_match_table);
+
+static struct spi_driver ks8851_driver = {
+	.driver = {
+		.name = "ks8851",
+		.of_match_table = ks8851_match_table,
+		.pm = &ks8851_pm_ops,
+	},
+	.probe = ks8851_probe_spi,
+	.remove = ks8851_remove_spi,
+};
+module_spi_driver(ks8851_driver);
+
+MODULE_DESCRIPTION("KS8851 Network driver");
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_LICENSE("GPL");
+
+module_param_named(message, msg_enable, int, 0);
+MODULE_PARM_DESC(message, "Message verbosity level (0=none, 31=all)");
+MODULE_ALIAS("spi:ks8851");
diff --git a/drivers/net/ethernet/micrel/ksz884x.c b/drivers/net/ethernet/micrel/ksz884x.c
new file mode 100644
index 000000000..1fa160641
--- /dev/null
+++ b/drivers/net/ethernet/micrel/ksz884x.c
@@ -0,0 +1,7245 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * drivers/net/ethernet/micrel/ksx884x.c - Micrel KSZ8841/2 PCI Ethernet driver
+ *
+ * Copyright (c) 2009-2010 Micrel, Inc.
+ * 	Tristram Ha <Tristram.Ha@micrel.com>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/pci.h>
+#include <linux/proc_fs.h>
+#include <linux/mii.h>
+#include <linux/platform_device.h>
+#include <linux/ethtool.h>
+#include <linux/etherdevice.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/if_vlan.h>
+#include <linux/crc32.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+
+
+/* DMA Registers */
+
+#define KS_DMA_TX_CTRL			0x0000
+#define DMA_TX_ENABLE			0x00000001
+#define DMA_TX_CRC_ENABLE		0x00000002
+#define DMA_TX_PAD_ENABLE		0x00000004
+#define DMA_TX_LOOPBACK			0x00000100
+#define DMA_TX_FLOW_ENABLE		0x00000200
+#define DMA_TX_CSUM_IP			0x00010000
+#define DMA_TX_CSUM_TCP			0x00020000
+#define DMA_TX_CSUM_UDP			0x00040000
+#define DMA_TX_BURST_SIZE		0x3F000000
+
+#define KS_DMA_RX_CTRL			0x0004
+#define DMA_RX_ENABLE			0x00000001
+#define KS884X_DMA_RX_MULTICAST		0x00000002
+#define DMA_RX_PROMISCUOUS		0x00000004
+#define DMA_RX_ERROR			0x00000008
+#define DMA_RX_UNICAST			0x00000010
+#define DMA_RX_ALL_MULTICAST		0x00000020
+#define DMA_RX_BROADCAST		0x00000040
+#define DMA_RX_FLOW_ENABLE		0x00000200
+#define DMA_RX_CSUM_IP			0x00010000
+#define DMA_RX_CSUM_TCP			0x00020000
+#define DMA_RX_CSUM_UDP			0x00040000
+#define DMA_RX_BURST_SIZE		0x3F000000
+
+#define DMA_BURST_SHIFT			24
+#define DMA_BURST_DEFAULT		8
+
+#define KS_DMA_TX_START			0x0008
+#define KS_DMA_RX_START			0x000C
+#define DMA_START			0x00000001
+
+#define KS_DMA_TX_ADDR			0x0010
+#define KS_DMA_RX_ADDR			0x0014
+
+#define DMA_ADDR_LIST_MASK		0xFFFFFFFC
+#define DMA_ADDR_LIST_SHIFT		2
+
+/* MTR0 */
+#define KS884X_MULTICAST_0_OFFSET	0x0020
+#define KS884X_MULTICAST_1_OFFSET	0x0021
+#define KS884X_MULTICAST_2_OFFSET	0x0022
+#define KS884x_MULTICAST_3_OFFSET	0x0023
+/* MTR1 */
+#define KS884X_MULTICAST_4_OFFSET	0x0024
+#define KS884X_MULTICAST_5_OFFSET	0x0025
+#define KS884X_MULTICAST_6_OFFSET	0x0026
+#define KS884X_MULTICAST_7_OFFSET	0x0027
+
+/* Interrupt Registers */
+
+/* INTEN */
+#define KS884X_INTERRUPTS_ENABLE	0x0028
+/* INTST */
+#define KS884X_INTERRUPTS_STATUS	0x002C
+
+#define KS884X_INT_RX_STOPPED		0x02000000
+#define KS884X_INT_TX_STOPPED		0x04000000
+#define KS884X_INT_RX_OVERRUN		0x08000000
+#define KS884X_INT_TX_EMPTY		0x10000000
+#define KS884X_INT_RX			0x20000000
+#define KS884X_INT_TX			0x40000000
+#define KS884X_INT_PHY			0x80000000
+
+#define KS884X_INT_RX_MASK		\
+	(KS884X_INT_RX | KS884X_INT_RX_OVERRUN)
+#define KS884X_INT_TX_MASK		\
+	(KS884X_INT_TX | KS884X_INT_TX_EMPTY)
+#define KS884X_INT_MASK	(KS884X_INT_RX | KS884X_INT_TX | KS884X_INT_PHY)
+
+/* MAC Additional Station Address */
+
+/* MAAL0 */
+#define KS_ADD_ADDR_0_LO		0x0080
+/* MAAH0 */
+#define KS_ADD_ADDR_0_HI		0x0084
+/* MAAL1 */
+#define KS_ADD_ADDR_1_LO		0x0088
+/* MAAH1 */
+#define KS_ADD_ADDR_1_HI		0x008C
+/* MAAL2 */
+#define KS_ADD_ADDR_2_LO		0x0090
+/* MAAH2 */
+#define KS_ADD_ADDR_2_HI		0x0094
+/* MAAL3 */
+#define KS_ADD_ADDR_3_LO		0x0098
+/* MAAH3 */
+#define KS_ADD_ADDR_3_HI		0x009C
+/* MAAL4 */
+#define KS_ADD_ADDR_4_LO		0x00A0
+/* MAAH4 */
+#define KS_ADD_ADDR_4_HI		0x00A4
+/* MAAL5 */
+#define KS_ADD_ADDR_5_LO		0x00A8
+/* MAAH5 */
+#define KS_ADD_ADDR_5_HI		0x00AC
+/* MAAL6 */
+#define KS_ADD_ADDR_6_LO		0x00B0
+/* MAAH6 */
+#define KS_ADD_ADDR_6_HI		0x00B4
+/* MAAL7 */
+#define KS_ADD_ADDR_7_LO		0x00B8
+/* MAAH7 */
+#define KS_ADD_ADDR_7_HI		0x00BC
+/* MAAL8 */
+#define KS_ADD_ADDR_8_LO		0x00C0
+/* MAAH8 */
+#define KS_ADD_ADDR_8_HI		0x00C4
+/* MAAL9 */
+#define KS_ADD_ADDR_9_LO		0x00C8
+/* MAAH9 */
+#define KS_ADD_ADDR_9_HI		0x00CC
+/* MAAL10 */
+#define KS_ADD_ADDR_A_LO		0x00D0
+/* MAAH10 */
+#define KS_ADD_ADDR_A_HI		0x00D4
+/* MAAL11 */
+#define KS_ADD_ADDR_B_LO		0x00D8
+/* MAAH11 */
+#define KS_ADD_ADDR_B_HI		0x00DC
+/* MAAL12 */
+#define KS_ADD_ADDR_C_LO		0x00E0
+/* MAAH12 */
+#define KS_ADD_ADDR_C_HI		0x00E4
+/* MAAL13 */
+#define KS_ADD_ADDR_D_LO		0x00E8
+/* MAAH13 */
+#define KS_ADD_ADDR_D_HI		0x00EC
+/* MAAL14 */
+#define KS_ADD_ADDR_E_LO		0x00F0
+/* MAAH14 */
+#define KS_ADD_ADDR_E_HI		0x00F4
+/* MAAL15 */
+#define KS_ADD_ADDR_F_LO		0x00F8
+/* MAAH15 */
+#define KS_ADD_ADDR_F_HI		0x00FC
+
+#define ADD_ADDR_HI_MASK		0x0000FFFF
+#define ADD_ADDR_ENABLE			0x80000000
+#define ADD_ADDR_INCR			8
+
+/* Miscellaneous Registers */
+
+/* MARL */
+#define KS884X_ADDR_0_OFFSET		0x0200
+#define KS884X_ADDR_1_OFFSET		0x0201
+/* MARM */
+#define KS884X_ADDR_2_OFFSET		0x0202
+#define KS884X_ADDR_3_OFFSET		0x0203
+/* MARH */
+#define KS884X_ADDR_4_OFFSET		0x0204
+#define KS884X_ADDR_5_OFFSET		0x0205
+
+/* OBCR */
+#define KS884X_BUS_CTRL_OFFSET		0x0210
+
+#define BUS_SPEED_125_MHZ		0x0000
+#define BUS_SPEED_62_5_MHZ		0x0001
+#define BUS_SPEED_41_66_MHZ		0x0002
+#define BUS_SPEED_25_MHZ		0x0003
+
+/* EEPCR */
+#define KS884X_EEPROM_CTRL_OFFSET	0x0212
+
+#define EEPROM_CHIP_SELECT		0x0001
+#define EEPROM_SERIAL_CLOCK		0x0002
+#define EEPROM_DATA_OUT			0x0004
+#define EEPROM_DATA_IN			0x0008
+#define EEPROM_ACCESS_ENABLE		0x0010
+
+/* MBIR */
+#define KS884X_MEM_INFO_OFFSET		0x0214
+
+#define RX_MEM_TEST_FAILED		0x0008
+#define RX_MEM_TEST_FINISHED		0x0010
+#define TX_MEM_TEST_FAILED		0x0800
+#define TX_MEM_TEST_FINISHED		0x1000
+
+/* GCR */
+#define KS884X_GLOBAL_CTRL_OFFSET	0x0216
+#define GLOBAL_SOFTWARE_RESET		0x0001
+
+#define KS8841_POWER_MANAGE_OFFSET	0x0218
+
+/* WFCR */
+#define KS8841_WOL_CTRL_OFFSET		0x021A
+#define KS8841_WOL_MAGIC_ENABLE		0x0080
+#define KS8841_WOL_FRAME3_ENABLE	0x0008
+#define KS8841_WOL_FRAME2_ENABLE	0x0004
+#define KS8841_WOL_FRAME1_ENABLE	0x0002
+#define KS8841_WOL_FRAME0_ENABLE	0x0001
+
+/* WF0 */
+#define KS8841_WOL_FRAME_CRC_OFFSET	0x0220
+#define KS8841_WOL_FRAME_BYTE0_OFFSET	0x0224
+#define KS8841_WOL_FRAME_BYTE2_OFFSET	0x0228
+
+/* IACR */
+#define KS884X_IACR_P			0x04A0
+#define KS884X_IACR_OFFSET		KS884X_IACR_P
+
+/* IADR1 */
+#define KS884X_IADR1_P			0x04A2
+#define KS884X_IADR2_P			0x04A4
+#define KS884X_IADR3_P			0x04A6
+#define KS884X_IADR4_P			0x04A8
+#define KS884X_IADR5_P			0x04AA
+
+#define KS884X_ACC_CTRL_SEL_OFFSET	KS884X_IACR_P
+#define KS884X_ACC_CTRL_INDEX_OFFSET	(KS884X_ACC_CTRL_SEL_OFFSET + 1)
+
+#define KS884X_ACC_DATA_0_OFFSET	KS884X_IADR4_P
+#define KS884X_ACC_DATA_1_OFFSET	(KS884X_ACC_DATA_0_OFFSET + 1)
+#define KS884X_ACC_DATA_2_OFFSET	KS884X_IADR5_P
+#define KS884X_ACC_DATA_3_OFFSET	(KS884X_ACC_DATA_2_OFFSET + 1)
+#define KS884X_ACC_DATA_4_OFFSET	KS884X_IADR2_P
+#define KS884X_ACC_DATA_5_OFFSET	(KS884X_ACC_DATA_4_OFFSET + 1)
+#define KS884X_ACC_DATA_6_OFFSET	KS884X_IADR3_P
+#define KS884X_ACC_DATA_7_OFFSET	(KS884X_ACC_DATA_6_OFFSET + 1)
+#define KS884X_ACC_DATA_8_OFFSET	KS884X_IADR1_P
+
+/* P1MBCR */
+#define KS884X_P1MBCR_P			0x04D0
+#define KS884X_P1MBSR_P			0x04D2
+#define KS884X_PHY1ILR_P		0x04D4
+#define KS884X_PHY1IHR_P		0x04D6
+#define KS884X_P1ANAR_P			0x04D8
+#define KS884X_P1ANLPR_P		0x04DA
+
+/* P2MBCR */
+#define KS884X_P2MBCR_P			0x04E0
+#define KS884X_P2MBSR_P			0x04E2
+#define KS884X_PHY2ILR_P		0x04E4
+#define KS884X_PHY2IHR_P		0x04E6
+#define KS884X_P2ANAR_P			0x04E8
+#define KS884X_P2ANLPR_P		0x04EA
+
+#define KS884X_PHY_1_CTRL_OFFSET	KS884X_P1MBCR_P
+#define PHY_CTRL_INTERVAL		(KS884X_P2MBCR_P - KS884X_P1MBCR_P)
+
+#define KS884X_PHY_CTRL_OFFSET		0x00
+
+/* Mode Control Register */
+#define PHY_REG_CTRL			0
+
+#define PHY_RESET			0x8000
+#define PHY_LOOPBACK			0x4000
+#define PHY_SPEED_100MBIT		0x2000
+#define PHY_AUTO_NEG_ENABLE		0x1000
+#define PHY_POWER_DOWN			0x0800
+#define PHY_MII_DISABLE			0x0400
+#define PHY_AUTO_NEG_RESTART		0x0200
+#define PHY_FULL_DUPLEX			0x0100
+#define PHY_COLLISION_TEST		0x0080
+#define PHY_HP_MDIX			0x0020
+#define PHY_FORCE_MDIX			0x0010
+#define PHY_AUTO_MDIX_DISABLE		0x0008
+#define PHY_REMOTE_FAULT_DISABLE	0x0004
+#define PHY_TRANSMIT_DISABLE		0x0002
+#define PHY_LED_DISABLE			0x0001
+
+#define KS884X_PHY_STATUS_OFFSET	0x02
+
+/* Mode Status Register */
+#define PHY_REG_STATUS			1
+
+#define PHY_100BT4_CAPABLE		0x8000
+#define PHY_100BTX_FD_CAPABLE		0x4000
+#define PHY_100BTX_CAPABLE		0x2000
+#define PHY_10BT_FD_CAPABLE		0x1000
+#define PHY_10BT_CAPABLE		0x0800
+#define PHY_MII_SUPPRESS_CAPABLE	0x0040
+#define PHY_AUTO_NEG_ACKNOWLEDGE	0x0020
+#define PHY_REMOTE_FAULT		0x0010
+#define PHY_AUTO_NEG_CAPABLE		0x0008
+#define PHY_LINK_STATUS			0x0004
+#define PHY_JABBER_DETECT		0x0002
+#define PHY_EXTENDED_CAPABILITY		0x0001
+
+#define KS884X_PHY_ID_1_OFFSET		0x04
+#define KS884X_PHY_ID_2_OFFSET		0x06
+
+/* PHY Identifier Registers */
+#define PHY_REG_ID_1			2
+#define PHY_REG_ID_2			3
+
+#define KS884X_PHY_AUTO_NEG_OFFSET	0x08
+
+/* Auto-Negotiation Advertisement Register */
+#define PHY_REG_AUTO_NEGOTIATION	4
+
+#define PHY_AUTO_NEG_NEXT_PAGE		0x8000
+#define PHY_AUTO_NEG_REMOTE_FAULT	0x2000
+/* Not supported. */
+#define PHY_AUTO_NEG_ASYM_PAUSE		0x0800
+#define PHY_AUTO_NEG_SYM_PAUSE		0x0400
+#define PHY_AUTO_NEG_100BT4		0x0200
+#define PHY_AUTO_NEG_100BTX_FD		0x0100
+#define PHY_AUTO_NEG_100BTX		0x0080
+#define PHY_AUTO_NEG_10BT_FD		0x0040
+#define PHY_AUTO_NEG_10BT		0x0020
+#define PHY_AUTO_NEG_SELECTOR		0x001F
+#define PHY_AUTO_NEG_802_3		0x0001
+
+#define PHY_AUTO_NEG_PAUSE  (PHY_AUTO_NEG_SYM_PAUSE | PHY_AUTO_NEG_ASYM_PAUSE)
+
+#define KS884X_PHY_REMOTE_CAP_OFFSET	0x0A
+
+/* Auto-Negotiation Link Partner Ability Register */
+#define PHY_REG_REMOTE_CAPABILITY	5
+
+#define PHY_REMOTE_NEXT_PAGE		0x8000
+#define PHY_REMOTE_ACKNOWLEDGE		0x4000
+#define PHY_REMOTE_REMOTE_FAULT		0x2000
+#define PHY_REMOTE_SYM_PAUSE		0x0400
+#define PHY_REMOTE_100BTX_FD		0x0100
+#define PHY_REMOTE_100BTX		0x0080
+#define PHY_REMOTE_10BT_FD		0x0040
+#define PHY_REMOTE_10BT			0x0020
+
+/* P1VCT */
+#define KS884X_P1VCT_P			0x04F0
+#define KS884X_P1PHYCTRL_P		0x04F2
+
+/* P2VCT */
+#define KS884X_P2VCT_P			0x04F4
+#define KS884X_P2PHYCTRL_P		0x04F6
+
+#define KS884X_PHY_SPECIAL_OFFSET	KS884X_P1VCT_P
+#define PHY_SPECIAL_INTERVAL		(KS884X_P2VCT_P - KS884X_P1VCT_P)
+
+#define KS884X_PHY_LINK_MD_OFFSET	0x00
+
+#define PHY_START_CABLE_DIAG		0x8000
+#define PHY_CABLE_DIAG_RESULT		0x6000
+#define PHY_CABLE_STAT_NORMAL		0x0000
+#define PHY_CABLE_STAT_OPEN		0x2000
+#define PHY_CABLE_STAT_SHORT		0x4000
+#define PHY_CABLE_STAT_FAILED		0x6000
+#define PHY_CABLE_10M_SHORT		0x1000
+#define PHY_CABLE_FAULT_COUNTER		0x01FF
+
+#define KS884X_PHY_PHY_CTRL_OFFSET	0x02
+
+#define PHY_STAT_REVERSED_POLARITY	0x0020
+#define PHY_STAT_MDIX			0x0010
+#define PHY_FORCE_LINK			0x0008
+#define PHY_POWER_SAVING_DISABLE	0x0004
+#define PHY_REMOTE_LOOPBACK		0x0002
+
+/* SIDER */
+#define KS884X_SIDER_P			0x0400
+#define KS884X_CHIP_ID_OFFSET		KS884X_SIDER_P
+#define KS884X_FAMILY_ID_OFFSET		(KS884X_CHIP_ID_OFFSET + 1)
+
+#define REG_FAMILY_ID			0x88
+
+#define REG_CHIP_ID_41			0x8810
+#define REG_CHIP_ID_42			0x8800
+
+#define KS884X_CHIP_ID_MASK_41		0xFF10
+#define KS884X_CHIP_ID_MASK		0xFFF0
+#define KS884X_CHIP_ID_SHIFT		4
+#define KS884X_REVISION_MASK		0x000E
+#define KS884X_REVISION_SHIFT		1
+#define KS8842_START			0x0001
+
+#define CHIP_IP_41_M			0x8810
+#define CHIP_IP_42_M			0x8800
+#define CHIP_IP_61_M			0x8890
+#define CHIP_IP_62_M			0x8880
+
+#define CHIP_IP_41_P			0x8850
+#define CHIP_IP_42_P			0x8840
+#define CHIP_IP_61_P			0x88D0
+#define CHIP_IP_62_P			0x88C0
+
+/* SGCR1 */
+#define KS8842_SGCR1_P			0x0402
+#define KS8842_SWITCH_CTRL_1_OFFSET	KS8842_SGCR1_P
+
+#define SWITCH_PASS_ALL			0x8000
+#define SWITCH_TX_FLOW_CTRL		0x2000
+#define SWITCH_RX_FLOW_CTRL		0x1000
+#define SWITCH_CHECK_LENGTH		0x0800
+#define SWITCH_AGING_ENABLE		0x0400
+#define SWITCH_FAST_AGING		0x0200
+#define SWITCH_AGGR_BACKOFF		0x0100
+#define SWITCH_PASS_PAUSE		0x0008
+#define SWITCH_LINK_AUTO_AGING		0x0001
+
+/* SGCR2 */
+#define KS8842_SGCR2_P			0x0404
+#define KS8842_SWITCH_CTRL_2_OFFSET	KS8842_SGCR2_P
+
+#define SWITCH_VLAN_ENABLE		0x8000
+#define SWITCH_IGMP_SNOOP		0x4000
+#define IPV6_MLD_SNOOP_ENABLE		0x2000
+#define IPV6_MLD_SNOOP_OPTION		0x1000
+#define PRIORITY_SCHEME_SELECT		0x0800
+#define SWITCH_MIRROR_RX_TX		0x0100
+#define UNICAST_VLAN_BOUNDARY		0x0080
+#define MULTICAST_STORM_DISABLE		0x0040
+#define SWITCH_BACK_PRESSURE		0x0020
+#define FAIR_FLOW_CTRL			0x0010
+#define NO_EXC_COLLISION_DROP		0x0008
+#define SWITCH_HUGE_PACKET		0x0004
+#define SWITCH_LEGAL_PACKET		0x0002
+#define SWITCH_BUF_RESERVE		0x0001
+
+/* SGCR3 */
+#define KS8842_SGCR3_P			0x0406
+#define KS8842_SWITCH_CTRL_3_OFFSET	KS8842_SGCR3_P
+
+#define BROADCAST_STORM_RATE_LO		0xFF00
+#define SWITCH_REPEATER			0x0080
+#define SWITCH_HALF_DUPLEX		0x0040
+#define SWITCH_FLOW_CTRL		0x0020
+#define SWITCH_10_MBIT			0x0010
+#define SWITCH_REPLACE_NULL_VID		0x0008
+#define BROADCAST_STORM_RATE_HI		0x0007
+
+#define BROADCAST_STORM_RATE		0x07FF
+
+/* SGCR4 */
+#define KS8842_SGCR4_P			0x0408
+
+/* SGCR5 */
+#define KS8842_SGCR5_P			0x040A
+#define KS8842_SWITCH_CTRL_5_OFFSET	KS8842_SGCR5_P
+
+#define LED_MODE			0x8200
+#define LED_SPEED_DUPLEX_ACT		0x0000
+#define LED_SPEED_DUPLEX_LINK_ACT	0x8000
+#define LED_DUPLEX_10_100		0x0200
+
+/* SGCR6 */
+#define KS8842_SGCR6_P			0x0410
+#define KS8842_SWITCH_CTRL_6_OFFSET	KS8842_SGCR6_P
+
+#define KS8842_PRIORITY_MASK		3
+#define KS8842_PRIORITY_SHIFT		2
+
+/* SGCR7 */
+#define KS8842_SGCR7_P			0x0412
+#define KS8842_SWITCH_CTRL_7_OFFSET	KS8842_SGCR7_P
+
+#define SWITCH_UNK_DEF_PORT_ENABLE	0x0008
+#define SWITCH_UNK_DEF_PORT_3		0x0004
+#define SWITCH_UNK_DEF_PORT_2		0x0002
+#define SWITCH_UNK_DEF_PORT_1		0x0001
+
+/* MACAR1 */
+#define KS8842_MACAR1_P			0x0470
+#define KS8842_MACAR2_P			0x0472
+#define KS8842_MACAR3_P			0x0474
+#define KS8842_MAC_ADDR_1_OFFSET	KS8842_MACAR1_P
+#define KS8842_MAC_ADDR_0_OFFSET	(KS8842_MAC_ADDR_1_OFFSET + 1)
+#define KS8842_MAC_ADDR_3_OFFSET	KS8842_MACAR2_P
+#define KS8842_MAC_ADDR_2_OFFSET	(KS8842_MAC_ADDR_3_OFFSET + 1)
+#define KS8842_MAC_ADDR_5_OFFSET	KS8842_MACAR3_P
+#define KS8842_MAC_ADDR_4_OFFSET	(KS8842_MAC_ADDR_5_OFFSET + 1)
+
+/* TOSR1 */
+#define KS8842_TOSR1_P			0x0480
+#define KS8842_TOSR2_P			0x0482
+#define KS8842_TOSR3_P			0x0484
+#define KS8842_TOSR4_P			0x0486
+#define KS8842_TOSR5_P			0x0488
+#define KS8842_TOSR6_P			0x048A
+#define KS8842_TOSR7_P			0x0490
+#define KS8842_TOSR8_P			0x0492
+#define KS8842_TOS_1_OFFSET		KS8842_TOSR1_P
+#define KS8842_TOS_2_OFFSET		KS8842_TOSR2_P
+#define KS8842_TOS_3_OFFSET		KS8842_TOSR3_P
+#define KS8842_TOS_4_OFFSET		KS8842_TOSR4_P
+#define KS8842_TOS_5_OFFSET		KS8842_TOSR5_P
+#define KS8842_TOS_6_OFFSET		KS8842_TOSR6_P
+
+#define KS8842_TOS_7_OFFSET		KS8842_TOSR7_P
+#define KS8842_TOS_8_OFFSET		KS8842_TOSR8_P
+
+/* P1CR1 */
+#define KS8842_P1CR1_P			0x0500
+#define KS8842_P1CR2_P			0x0502
+#define KS8842_P1VIDR_P			0x0504
+#define KS8842_P1CR3_P			0x0506
+#define KS8842_P1IRCR_P			0x0508
+#define KS8842_P1ERCR_P			0x050A
+#define KS884X_P1SCSLMD_P		0x0510
+#define KS884X_P1CR4_P			0x0512
+#define KS884X_P1SR_P			0x0514
+
+/* P2CR1 */
+#define KS8842_P2CR1_P			0x0520
+#define KS8842_P2CR2_P			0x0522
+#define KS8842_P2VIDR_P			0x0524
+#define KS8842_P2CR3_P			0x0526
+#define KS8842_P2IRCR_P			0x0528
+#define KS8842_P2ERCR_P			0x052A
+#define KS884X_P2SCSLMD_P		0x0530
+#define KS884X_P2CR4_P			0x0532
+#define KS884X_P2SR_P			0x0534
+
+/* P3CR1 */
+#define KS8842_P3CR1_P			0x0540
+#define KS8842_P3CR2_P			0x0542
+#define KS8842_P3VIDR_P			0x0544
+#define KS8842_P3CR3_P			0x0546
+#define KS8842_P3IRCR_P			0x0548
+#define KS8842_P3ERCR_P			0x054A
+
+#define KS8842_PORT_1_CTRL_1		KS8842_P1CR1_P
+#define KS8842_PORT_2_CTRL_1		KS8842_P2CR1_P
+#define KS8842_PORT_3_CTRL_1		KS8842_P3CR1_P
+
+#define PORT_CTRL_ADDR(port, addr)		\
+	(addr = KS8842_PORT_1_CTRL_1 + (port) *	\
+		(KS8842_PORT_2_CTRL_1 - KS8842_PORT_1_CTRL_1))
+
+#define KS8842_PORT_CTRL_1_OFFSET	0x00
+
+#define PORT_BROADCAST_STORM		0x0080
+#define PORT_DIFFSERV_ENABLE		0x0040
+#define PORT_802_1P_ENABLE		0x0020
+#define PORT_BASED_PRIORITY_MASK	0x0018
+#define PORT_BASED_PRIORITY_BASE	0x0003
+#define PORT_BASED_PRIORITY_SHIFT	3
+#define PORT_BASED_PRIORITY_0		0x0000
+#define PORT_BASED_PRIORITY_1		0x0008
+#define PORT_BASED_PRIORITY_2		0x0010
+#define PORT_BASED_PRIORITY_3		0x0018
+#define PORT_INSERT_TAG			0x0004
+#define PORT_REMOVE_TAG			0x0002
+#define PORT_PRIO_QUEUE_ENABLE		0x0001
+
+#define KS8842_PORT_CTRL_2_OFFSET	0x02
+
+#define PORT_INGRESS_VLAN_FILTER	0x4000
+#define PORT_DISCARD_NON_VID		0x2000
+#define PORT_FORCE_FLOW_CTRL		0x1000
+#define PORT_BACK_PRESSURE		0x0800
+#define PORT_TX_ENABLE			0x0400
+#define PORT_RX_ENABLE			0x0200
+#define PORT_LEARN_DISABLE		0x0100
+#define PORT_MIRROR_SNIFFER		0x0080
+#define PORT_MIRROR_RX			0x0040
+#define PORT_MIRROR_TX			0x0020
+#define PORT_USER_PRIORITY_CEILING	0x0008
+#define PORT_VLAN_MEMBERSHIP		0x0007
+
+#define KS8842_PORT_CTRL_VID_OFFSET	0x04
+
+#define PORT_DEFAULT_VID		0x0001
+
+#define KS8842_PORT_CTRL_3_OFFSET	0x06
+
+#define PORT_INGRESS_LIMIT_MODE		0x000C
+#define PORT_INGRESS_ALL		0x0000
+#define PORT_INGRESS_UNICAST		0x0004
+#define PORT_INGRESS_MULTICAST		0x0008
+#define PORT_INGRESS_BROADCAST		0x000C
+#define PORT_COUNT_IFG			0x0002
+#define PORT_COUNT_PREAMBLE		0x0001
+
+#define KS8842_PORT_IN_RATE_OFFSET	0x08
+#define KS8842_PORT_OUT_RATE_OFFSET	0x0A
+
+#define PORT_PRIORITY_RATE		0x0F
+#define PORT_PRIORITY_RATE_SHIFT	4
+
+#define KS884X_PORT_LINK_MD		0x10
+
+#define PORT_CABLE_10M_SHORT		0x8000
+#define PORT_CABLE_DIAG_RESULT		0x6000
+#define PORT_CABLE_STAT_NORMAL		0x0000
+#define PORT_CABLE_STAT_OPEN		0x2000
+#define PORT_CABLE_STAT_SHORT		0x4000
+#define PORT_CABLE_STAT_FAILED		0x6000
+#define PORT_START_CABLE_DIAG		0x1000
+#define PORT_FORCE_LINK			0x0800
+#define PORT_POWER_SAVING_DISABLE	0x0400
+#define PORT_PHY_REMOTE_LOOPBACK	0x0200
+#define PORT_CABLE_FAULT_COUNTER	0x01FF
+
+#define KS884X_PORT_CTRL_4_OFFSET	0x12
+
+#define PORT_LED_OFF			0x8000
+#define PORT_TX_DISABLE			0x4000
+#define PORT_AUTO_NEG_RESTART		0x2000
+#define PORT_REMOTE_FAULT_DISABLE	0x1000
+#define PORT_POWER_DOWN			0x0800
+#define PORT_AUTO_MDIX_DISABLE		0x0400
+#define PORT_FORCE_MDIX			0x0200
+#define PORT_LOOPBACK			0x0100
+#define PORT_AUTO_NEG_ENABLE		0x0080
+#define PORT_FORCE_100_MBIT		0x0040
+#define PORT_FORCE_FULL_DUPLEX		0x0020
+#define PORT_AUTO_NEG_SYM_PAUSE		0x0010
+#define PORT_AUTO_NEG_100BTX_FD		0x0008
+#define PORT_AUTO_NEG_100BTX		0x0004
+#define PORT_AUTO_NEG_10BT_FD		0x0002
+#define PORT_AUTO_NEG_10BT		0x0001
+
+#define KS884X_PORT_STATUS_OFFSET	0x14
+
+#define PORT_HP_MDIX			0x8000
+#define PORT_REVERSED_POLARITY		0x2000
+#define PORT_RX_FLOW_CTRL		0x0800
+#define PORT_TX_FLOW_CTRL		0x1000
+#define PORT_STATUS_SPEED_100MBIT	0x0400
+#define PORT_STATUS_FULL_DUPLEX		0x0200
+#define PORT_REMOTE_FAULT		0x0100
+#define PORT_MDIX_STATUS		0x0080
+#define PORT_AUTO_NEG_COMPLETE		0x0040
+#define PORT_STATUS_LINK_GOOD		0x0020
+#define PORT_REMOTE_SYM_PAUSE		0x0010
+#define PORT_REMOTE_100BTX_FD		0x0008
+#define PORT_REMOTE_100BTX		0x0004
+#define PORT_REMOTE_10BT_FD		0x0002
+#define PORT_REMOTE_10BT		0x0001
+
+/*
+#define STATIC_MAC_TABLE_ADDR		00-0000FFFF-FFFFFFFF
+#define STATIC_MAC_TABLE_FWD_PORTS	00-00070000-00000000
+#define STATIC_MAC_TABLE_VALID		00-00080000-00000000
+#define STATIC_MAC_TABLE_OVERRIDE	00-00100000-00000000
+#define STATIC_MAC_TABLE_USE_FID	00-00200000-00000000
+#define STATIC_MAC_TABLE_FID		00-03C00000-00000000
+*/
+
+#define STATIC_MAC_TABLE_ADDR		0x0000FFFF
+#define STATIC_MAC_TABLE_FWD_PORTS	0x00070000
+#define STATIC_MAC_TABLE_VALID		0x00080000
+#define STATIC_MAC_TABLE_OVERRIDE	0x00100000
+#define STATIC_MAC_TABLE_USE_FID	0x00200000
+#define STATIC_MAC_TABLE_FID		0x03C00000
+
+#define STATIC_MAC_FWD_PORTS_SHIFT	16
+#define STATIC_MAC_FID_SHIFT		22
+
+/*
+#define VLAN_TABLE_VID			00-00000000-00000FFF
+#define VLAN_TABLE_FID			00-00000000-0000F000
+#define VLAN_TABLE_MEMBERSHIP		00-00000000-00070000
+#define VLAN_TABLE_VALID		00-00000000-00080000
+*/
+
+#define VLAN_TABLE_VID			0x00000FFF
+#define VLAN_TABLE_FID			0x0000F000
+#define VLAN_TABLE_MEMBERSHIP		0x00070000
+#define VLAN_TABLE_VALID		0x00080000
+
+#define VLAN_TABLE_FID_SHIFT		12
+#define VLAN_TABLE_MEMBERSHIP_SHIFT	16
+
+/*
+#define DYNAMIC_MAC_TABLE_ADDR		00-0000FFFF-FFFFFFFF
+#define DYNAMIC_MAC_TABLE_FID		00-000F0000-00000000
+#define DYNAMIC_MAC_TABLE_SRC_PORT	00-00300000-00000000
+#define DYNAMIC_MAC_TABLE_TIMESTAMP	00-00C00000-00000000
+#define DYNAMIC_MAC_TABLE_ENTRIES	03-FF000000-00000000
+#define DYNAMIC_MAC_TABLE_MAC_EMPTY	04-00000000-00000000
+#define DYNAMIC_MAC_TABLE_RESERVED	78-00000000-00000000
+#define DYNAMIC_MAC_TABLE_NOT_READY	80-00000000-00000000
+*/
+
+#define DYNAMIC_MAC_TABLE_ADDR		0x0000FFFF
+#define DYNAMIC_MAC_TABLE_FID		0x000F0000
+#define DYNAMIC_MAC_TABLE_SRC_PORT	0x00300000
+#define DYNAMIC_MAC_TABLE_TIMESTAMP	0x00C00000
+#define DYNAMIC_MAC_TABLE_ENTRIES	0xFF000000
+
+#define DYNAMIC_MAC_TABLE_ENTRIES_H	0x03
+#define DYNAMIC_MAC_TABLE_MAC_EMPTY	0x04
+#define DYNAMIC_MAC_TABLE_RESERVED	0x78
+#define DYNAMIC_MAC_TABLE_NOT_READY	0x80
+
+#define DYNAMIC_MAC_FID_SHIFT		16
+#define DYNAMIC_MAC_SRC_PORT_SHIFT	20
+#define DYNAMIC_MAC_TIMESTAMP_SHIFT	22
+#define DYNAMIC_MAC_ENTRIES_SHIFT	24
+#define DYNAMIC_MAC_ENTRIES_H_SHIFT	8
+
+/*
+#define MIB_COUNTER_VALUE		00-00000000-3FFFFFFF
+#define MIB_COUNTER_VALID		00-00000000-40000000
+#define MIB_COUNTER_OVERFLOW		00-00000000-80000000
+*/
+
+#define MIB_COUNTER_VALUE		0x3FFFFFFF
+#define MIB_COUNTER_VALID		0x40000000
+#define MIB_COUNTER_OVERFLOW		0x80000000
+
+#define MIB_PACKET_DROPPED		0x0000FFFF
+
+#define KS_MIB_PACKET_DROPPED_TX_0	0x100
+#define KS_MIB_PACKET_DROPPED_TX_1	0x101
+#define KS_MIB_PACKET_DROPPED_TX	0x102
+#define KS_MIB_PACKET_DROPPED_RX_0	0x103
+#define KS_MIB_PACKET_DROPPED_RX_1	0x104
+#define KS_MIB_PACKET_DROPPED_RX	0x105
+
+/* Change default LED mode. */
+#define SET_DEFAULT_LED			LED_SPEED_DUPLEX_ACT
+
+#define MAC_ADDR_ORDER(i)		(ETH_ALEN - 1 - (i))
+
+#define MAX_ETHERNET_BODY_SIZE		1500
+#define ETHERNET_HEADER_SIZE		(14 + VLAN_HLEN)
+
+#define MAX_ETHERNET_PACKET_SIZE	\
+	(MAX_ETHERNET_BODY_SIZE + ETHERNET_HEADER_SIZE)
+
+#define REGULAR_RX_BUF_SIZE		(MAX_ETHERNET_PACKET_SIZE + 4)
+#define MAX_RX_BUF_SIZE			(1912 + 4)
+
+#define ADDITIONAL_ENTRIES		16
+#define MAX_MULTICAST_LIST		32
+
+#define HW_MULTICAST_SIZE		8
+
+#define HW_TO_DEV_PORT(port)		(port - 1)
+
+enum {
+	media_connected,
+	media_disconnected
+};
+
+enum {
+	OID_COUNTER_UNKOWN,
+
+	OID_COUNTER_FIRST,
+
+	/* total transmit errors */
+	OID_COUNTER_XMIT_ERROR,
+
+	/* total receive errors */
+	OID_COUNTER_RCV_ERROR,
+
+	OID_COUNTER_LAST
+};
+
+/*
+ * Hardware descriptor definitions
+ */
+
+#define DESC_ALIGNMENT			16
+#define BUFFER_ALIGNMENT		8
+
+#define NUM_OF_RX_DESC			64
+#define NUM_OF_TX_DESC			64
+
+#define KS_DESC_RX_FRAME_LEN		0x000007FF
+#define KS_DESC_RX_FRAME_TYPE		0x00008000
+#define KS_DESC_RX_ERROR_CRC		0x00010000
+#define KS_DESC_RX_ERROR_RUNT		0x00020000
+#define KS_DESC_RX_ERROR_TOO_LONG	0x00040000
+#define KS_DESC_RX_ERROR_PHY		0x00080000
+#define KS884X_DESC_RX_PORT_MASK	0x00300000
+#define KS_DESC_RX_MULTICAST		0x01000000
+#define KS_DESC_RX_ERROR		0x02000000
+#define KS_DESC_RX_ERROR_CSUM_UDP	0x04000000
+#define KS_DESC_RX_ERROR_CSUM_TCP	0x08000000
+#define KS_DESC_RX_ERROR_CSUM_IP	0x10000000
+#define KS_DESC_RX_LAST			0x20000000
+#define KS_DESC_RX_FIRST		0x40000000
+#define KS_DESC_RX_ERROR_COND		\
+	(KS_DESC_RX_ERROR_CRC |		\
+	KS_DESC_RX_ERROR_RUNT |		\
+	KS_DESC_RX_ERROR_PHY |		\
+	KS_DESC_RX_ERROR_TOO_LONG)
+
+#define KS_DESC_HW_OWNED		0x80000000
+
+#define KS_DESC_BUF_SIZE		0x000007FF
+#define KS884X_DESC_TX_PORT_MASK	0x00300000
+#define KS_DESC_END_OF_RING		0x02000000
+#define KS_DESC_TX_CSUM_GEN_UDP		0x04000000
+#define KS_DESC_TX_CSUM_GEN_TCP		0x08000000
+#define KS_DESC_TX_CSUM_GEN_IP		0x10000000
+#define KS_DESC_TX_LAST			0x20000000
+#define KS_DESC_TX_FIRST		0x40000000
+#define KS_DESC_TX_INTERRUPT		0x80000000
+
+#define KS_DESC_PORT_SHIFT		20
+
+#define KS_DESC_RX_MASK			(KS_DESC_BUF_SIZE)
+
+#define KS_DESC_TX_MASK			\
+	(KS_DESC_TX_INTERRUPT |		\
+	KS_DESC_TX_FIRST |		\
+	KS_DESC_TX_LAST |		\
+	KS_DESC_TX_CSUM_GEN_IP |	\
+	KS_DESC_TX_CSUM_GEN_TCP |	\
+	KS_DESC_TX_CSUM_GEN_UDP |	\
+	KS_DESC_BUF_SIZE)
+
+struct ksz_desc_rx_stat {
+#ifdef __BIG_ENDIAN_BITFIELD
+	u32 hw_owned:1;
+	u32 first_desc:1;
+	u32 last_desc:1;
+	u32 csum_err_ip:1;
+	u32 csum_err_tcp:1;
+	u32 csum_err_udp:1;
+	u32 error:1;
+	u32 multicast:1;
+	u32 src_port:4;
+	u32 err_phy:1;
+	u32 err_too_long:1;
+	u32 err_runt:1;
+	u32 err_crc:1;
+	u32 frame_type:1;
+	u32 reserved1:4;
+	u32 frame_len:11;
+#else
+	u32 frame_len:11;
+	u32 reserved1:4;
+	u32 frame_type:1;
+	u32 err_crc:1;
+	u32 err_runt:1;
+	u32 err_too_long:1;
+	u32 err_phy:1;
+	u32 src_port:4;
+	u32 multicast:1;
+	u32 error:1;
+	u32 csum_err_udp:1;
+	u32 csum_err_tcp:1;
+	u32 csum_err_ip:1;
+	u32 last_desc:1;
+	u32 first_desc:1;
+	u32 hw_owned:1;
+#endif
+};
+
+struct ksz_desc_tx_stat {
+#ifdef __BIG_ENDIAN_BITFIELD
+	u32 hw_owned:1;
+	u32 reserved1:31;
+#else
+	u32 reserved1:31;
+	u32 hw_owned:1;
+#endif
+};
+
+struct ksz_desc_rx_buf {
+#ifdef __BIG_ENDIAN_BITFIELD
+	u32 reserved4:6;
+	u32 end_of_ring:1;
+	u32 reserved3:14;
+	u32 buf_size:11;
+#else
+	u32 buf_size:11;
+	u32 reserved3:14;
+	u32 end_of_ring:1;
+	u32 reserved4:6;
+#endif
+};
+
+struct ksz_desc_tx_buf {
+#ifdef __BIG_ENDIAN_BITFIELD
+	u32 intr:1;
+	u32 first_seg:1;
+	u32 last_seg:1;
+	u32 csum_gen_ip:1;
+	u32 csum_gen_tcp:1;
+	u32 csum_gen_udp:1;
+	u32 end_of_ring:1;
+	u32 reserved4:1;
+	u32 dest_port:4;
+	u32 reserved3:9;
+	u32 buf_size:11;
+#else
+	u32 buf_size:11;
+	u32 reserved3:9;
+	u32 dest_port:4;
+	u32 reserved4:1;
+	u32 end_of_ring:1;
+	u32 csum_gen_udp:1;
+	u32 csum_gen_tcp:1;
+	u32 csum_gen_ip:1;
+	u32 last_seg:1;
+	u32 first_seg:1;
+	u32 intr:1;
+#endif
+};
+
+union desc_stat {
+	struct ksz_desc_rx_stat rx;
+	struct ksz_desc_tx_stat tx;
+	u32 data;
+};
+
+union desc_buf {
+	struct ksz_desc_rx_buf rx;
+	struct ksz_desc_tx_buf tx;
+	u32 data;
+};
+
+/**
+ * struct ksz_hw_desc - Hardware descriptor data structure
+ * @ctrl:	Descriptor control value.
+ * @buf:	Descriptor buffer value.
+ * @addr:	Physical address of memory buffer.
+ * @next:	Pointer to next hardware descriptor.
+ */
+struct ksz_hw_desc {
+	union desc_stat ctrl;
+	union desc_buf buf;
+	u32 addr;
+	u32 next;
+};
+
+/**
+ * struct ksz_sw_desc - Software descriptor data structure
+ * @ctrl:	Descriptor control value.
+ * @buf:	Descriptor buffer value.
+ * @buf_size:	Current buffers size value in hardware descriptor.
+ */
+struct ksz_sw_desc {
+	union desc_stat ctrl;
+	union desc_buf buf;
+	u32 buf_size;
+};
+
+/**
+ * struct ksz_dma_buf - OS dependent DMA buffer data structure
+ * @skb:	Associated socket buffer.
+ * @dma:	Associated physical DMA address.
+ * @len:	Actual len used.
+ */
+struct ksz_dma_buf {
+	struct sk_buff *skb;
+	dma_addr_t dma;
+	int len;
+};
+
+/**
+ * struct ksz_desc - Descriptor structure
+ * @phw:	Hardware descriptor pointer to uncached physical memory.
+ * @sw:		Cached memory to hold hardware descriptor values for
+ * 		manipulation.
+ * @dma_buf:	Operating system dependent data structure to hold physical
+ * 		memory buffer allocation information.
+ */
+struct ksz_desc {
+	struct ksz_hw_desc *phw;
+	struct ksz_sw_desc sw;
+	struct ksz_dma_buf dma_buf;
+};
+
+#define DMA_BUFFER(desc)  ((struct ksz_dma_buf *)(&(desc)->dma_buf))
+
+/**
+ * struct ksz_desc_info - Descriptor information data structure
+ * @ring:	First descriptor in the ring.
+ * @cur:	Current descriptor being manipulated.
+ * @ring_virt:	First hardware descriptor in the ring.
+ * @ring_phys:	The physical address of the first descriptor of the ring.
+ * @size:	Size of hardware descriptor.
+ * @alloc:	Number of descriptors allocated.
+ * @avail:	Number of descriptors available for use.
+ * @last:	Index for last descriptor released to hardware.
+ * @next:	Index for next descriptor available for use.
+ * @mask:	Mask for index wrapping.
+ */
+struct ksz_desc_info {
+	struct ksz_desc *ring;
+	struct ksz_desc *cur;
+	struct ksz_hw_desc *ring_virt;
+	u32 ring_phys;
+	int size;
+	int alloc;
+	int avail;
+	int last;
+	int next;
+	int mask;
+};
+
+/*
+ * KSZ8842 switch definitions
+ */
+
+enum {
+	TABLE_STATIC_MAC = 0,
+	TABLE_VLAN,
+	TABLE_DYNAMIC_MAC,
+	TABLE_MIB
+};
+
+#define LEARNED_MAC_TABLE_ENTRIES	1024
+#define STATIC_MAC_TABLE_ENTRIES	8
+
+/**
+ * struct ksz_mac_table - Static MAC table data structure
+ * @mac_addr:	MAC address to filter.
+ * @vid:	VID value.
+ * @fid:	FID value.
+ * @ports:	Port membership.
+ * @override:	Override setting.
+ * @use_fid:	FID use setting.
+ * @valid:	Valid setting indicating the entry is being used.
+ */
+struct ksz_mac_table {
+	u8 mac_addr[ETH_ALEN];
+	u16 vid;
+	u8 fid;
+	u8 ports;
+	u8 override:1;
+	u8 use_fid:1;
+	u8 valid:1;
+};
+
+#define VLAN_TABLE_ENTRIES		16
+
+/**
+ * struct ksz_vlan_table - VLAN table data structure
+ * @vid:	VID value.
+ * @fid:	FID value.
+ * @member:	Port membership.
+ */
+struct ksz_vlan_table {
+	u16 vid;
+	u8 fid;
+	u8 member;
+};
+
+#define DIFFSERV_ENTRIES		64
+#define PRIO_802_1P_ENTRIES		8
+#define PRIO_QUEUES			4
+
+#define SWITCH_PORT_NUM			2
+#define TOTAL_PORT_NUM			(SWITCH_PORT_NUM + 1)
+#define HOST_MASK			(1 << SWITCH_PORT_NUM)
+#define PORT_MASK			7
+
+#define MAIN_PORT			0
+#define OTHER_PORT			1
+#define HOST_PORT			SWITCH_PORT_NUM
+
+#define PORT_COUNTER_NUM		0x20
+#define TOTAL_PORT_COUNTER_NUM		(PORT_COUNTER_NUM + 2)
+
+#define MIB_COUNTER_RX_LO_PRIORITY	0x00
+#define MIB_COUNTER_RX_HI_PRIORITY	0x01
+#define MIB_COUNTER_RX_UNDERSIZE	0x02
+#define MIB_COUNTER_RX_FRAGMENT		0x03
+#define MIB_COUNTER_RX_OVERSIZE		0x04
+#define MIB_COUNTER_RX_JABBER		0x05
+#define MIB_COUNTER_RX_SYMBOL_ERR	0x06
+#define MIB_COUNTER_RX_CRC_ERR		0x07
+#define MIB_COUNTER_RX_ALIGNMENT_ERR	0x08
+#define MIB_COUNTER_RX_CTRL_8808	0x09
+#define MIB_COUNTER_RX_PAUSE		0x0A
+#define MIB_COUNTER_RX_BROADCAST	0x0B
+#define MIB_COUNTER_RX_MULTICAST	0x0C
+#define MIB_COUNTER_RX_UNICAST		0x0D
+#define MIB_COUNTER_RX_OCTET_64		0x0E
+#define MIB_COUNTER_RX_OCTET_65_127	0x0F
+#define MIB_COUNTER_RX_OCTET_128_255	0x10
+#define MIB_COUNTER_RX_OCTET_256_511	0x11
+#define MIB_COUNTER_RX_OCTET_512_1023	0x12
+#define MIB_COUNTER_RX_OCTET_1024_1522	0x13
+#define MIB_COUNTER_TX_LO_PRIORITY	0x14
+#define MIB_COUNTER_TX_HI_PRIORITY	0x15
+#define MIB_COUNTER_TX_LATE_COLLISION	0x16
+#define MIB_COUNTER_TX_PAUSE		0x17
+#define MIB_COUNTER_TX_BROADCAST	0x18
+#define MIB_COUNTER_TX_MULTICAST	0x19
+#define MIB_COUNTER_TX_UNICAST		0x1A
+#define MIB_COUNTER_TX_DEFERRED		0x1B
+#define MIB_COUNTER_TX_TOTAL_COLLISION	0x1C
+#define MIB_COUNTER_TX_EXCESS_COLLISION	0x1D
+#define MIB_COUNTER_TX_SINGLE_COLLISION	0x1E
+#define MIB_COUNTER_TX_MULTI_COLLISION	0x1F
+
+#define MIB_COUNTER_RX_DROPPED_PACKET	0x20
+#define MIB_COUNTER_TX_DROPPED_PACKET	0x21
+
+/**
+ * struct ksz_port_mib - Port MIB data structure
+ * @cnt_ptr:	Current pointer to MIB counter index.
+ * @link_down:	Indication the link has just gone down.
+ * @state:	Connection status of the port.
+ * @mib_start:	The starting counter index.  Some ports do not start at 0.
+ * @counter:	64-bit MIB counter value.
+ * @dropped:	Temporary buffer to remember last read packet dropped values.
+ *
+ * MIB counters needs to be read periodically so that counters do not get
+ * overflowed and give incorrect values.  A right balance is needed to
+ * satisfy this condition and not waste too much CPU time.
+ *
+ * It is pointless to read MIB counters when the port is disconnected.  The
+ * @state provides the connection status so that MIB counters are read only
+ * when the port is connected.  The @link_down indicates the port is just
+ * disconnected so that all MIB counters are read one last time to update the
+ * information.
+ */
+struct ksz_port_mib {
+	u8 cnt_ptr;
+	u8 link_down;
+	u8 state;
+	u8 mib_start;
+
+	u64 counter[TOTAL_PORT_COUNTER_NUM];
+	u32 dropped[2];
+};
+
+/**
+ * struct ksz_port_cfg - Port configuration data structure
+ * @vid:	VID value.
+ * @member:	Port membership.
+ * @port_prio:	Port priority.
+ * @rx_rate:	Receive priority rate.
+ * @tx_rate:	Transmit priority rate.
+ * @stp_state:	Current Spanning Tree Protocol state.
+ */
+struct ksz_port_cfg {
+	u16 vid;
+	u8 member;
+	u8 port_prio;
+	u32 rx_rate[PRIO_QUEUES];
+	u32 tx_rate[PRIO_QUEUES];
+	int stp_state;
+};
+
+/**
+ * struct ksz_switch - KSZ8842 switch data structure
+ * @mac_table:	MAC table entries information.
+ * @vlan_table:	VLAN table entries information.
+ * @port_cfg:	Port configuration information.
+ * @diffserv:	DiffServ priority settings.  Possible values from 6-bit of ToS
+ * 		(bit7 ~ bit2) field.
+ * @p_802_1p:	802.1P priority settings.  Possible values from 3-bit of 802.1p
+ * 		Tag priority field.
+ * @br_addr:	Bridge address.  Used for STP.
+ * @other_addr:	Other MAC address.  Used for multiple network device mode.
+ * @broad_per:	Broadcast storm percentage.
+ * @member:	Current port membership.  Used for STP.
+ */
+struct ksz_switch {
+	struct ksz_mac_table mac_table[STATIC_MAC_TABLE_ENTRIES];
+	struct ksz_vlan_table vlan_table[VLAN_TABLE_ENTRIES];
+	struct ksz_port_cfg port_cfg[TOTAL_PORT_NUM];
+
+	u8 diffserv[DIFFSERV_ENTRIES];
+	u8 p_802_1p[PRIO_802_1P_ENTRIES];
+
+	u8 br_addr[ETH_ALEN];
+	u8 other_addr[ETH_ALEN];
+
+	u8 broad_per;
+	u8 member;
+};
+
+#define TX_RATE_UNIT			10000
+
+/**
+ * struct ksz_port_info - Port information data structure
+ * @state:	Connection status of the port.
+ * @tx_rate:	Transmit rate divided by 10000 to get Mbit.
+ * @duplex:	Duplex mode.
+ * @advertised:	Advertised auto-negotiation setting.  Used to determine link.
+ * @partner:	Auto-negotiation partner setting.  Used to determine link.
+ * @port_id:	Port index to access actual hardware register.
+ * @pdev:	Pointer to OS dependent network device.
+ */
+struct ksz_port_info {
+	uint state;
+	uint tx_rate;
+	u8 duplex;
+	u8 advertised;
+	u8 partner;
+	u8 port_id;
+	void *pdev;
+};
+
+#define MAX_TX_HELD_SIZE		52000
+
+/* Hardware features and bug fixes. */
+#define LINK_INT_WORKING		(1 << 0)
+#define SMALL_PACKET_TX_BUG		(1 << 1)
+#define HALF_DUPLEX_SIGNAL_BUG		(1 << 2)
+#define RX_HUGE_FRAME			(1 << 4)
+#define STP_SUPPORT			(1 << 8)
+
+/* Software overrides. */
+#define PAUSE_FLOW_CTRL			(1 << 0)
+#define FAST_AGING			(1 << 1)
+
+/**
+ * struct ksz_hw - KSZ884X hardware data structure
+ * @io:			Virtual address assigned.
+ * @ksz_switch:		Pointer to KSZ8842 switch.
+ * @port_info:		Port information.
+ * @port_mib:		Port MIB information.
+ * @dev_count:		Number of network devices this hardware supports.
+ * @dst_ports:		Destination ports in switch for transmission.
+ * @id:			Hardware ID.  Used for display only.
+ * @mib_cnt:		Number of MIB counters this hardware has.
+ * @mib_port_cnt:	Number of ports with MIB counters.
+ * @tx_cfg:		Cached transmit control settings.
+ * @rx_cfg:		Cached receive control settings.
+ * @intr_mask:		Current interrupt mask.
+ * @intr_set:		Current interrup set.
+ * @intr_blocked:	Interrupt blocked.
+ * @rx_desc_info:	Receive descriptor information.
+ * @tx_desc_info:	Transmit descriptor information.
+ * @tx_int_cnt:		Transmit interrupt count.  Used for TX optimization.
+ * @tx_int_mask:	Transmit interrupt mask.  Used for TX optimization.
+ * @tx_size:		Transmit data size.  Used for TX optimization.
+ * 			The maximum is defined by MAX_TX_HELD_SIZE.
+ * @perm_addr:		Permanent MAC address.
+ * @override_addr:	Overridden MAC address.
+ * @address:		Additional MAC address entries.
+ * @addr_list_size:	Additional MAC address list size.
+ * @mac_override:	Indication of MAC address overridden.
+ * @promiscuous:	Counter to keep track of promiscuous mode set.
+ * @all_multi:		Counter to keep track of all multicast mode set.
+ * @multi_list:		Multicast address entries.
+ * @multi_bits:		Cached multicast hash table settings.
+ * @multi_list_size:	Multicast address list size.
+ * @enabled:		Indication of hardware enabled.
+ * @rx_stop:		Indication of receive process stop.
+ * @reserved2:		none
+ * @features:		Hardware features to enable.
+ * @overrides:		Hardware features to override.
+ * @parent:		Pointer to parent, network device private structure.
+ */
+struct ksz_hw {
+	void __iomem *io;
+
+	struct ksz_switch *ksz_switch;
+	struct ksz_port_info port_info[SWITCH_PORT_NUM];
+	struct ksz_port_mib port_mib[TOTAL_PORT_NUM];
+	int dev_count;
+	int dst_ports;
+	int id;
+	int mib_cnt;
+	int mib_port_cnt;
+
+	u32 tx_cfg;
+	u32 rx_cfg;
+	u32 intr_mask;
+	u32 intr_set;
+	uint intr_blocked;
+
+	struct ksz_desc_info rx_desc_info;
+	struct ksz_desc_info tx_desc_info;
+
+	int tx_int_cnt;
+	int tx_int_mask;
+	int tx_size;
+
+	u8 perm_addr[ETH_ALEN];
+	u8 override_addr[ETH_ALEN];
+	u8 address[ADDITIONAL_ENTRIES][ETH_ALEN];
+	u8 addr_list_size;
+	u8 mac_override;
+	u8 promiscuous;
+	u8 all_multi;
+	u8 multi_list[MAX_MULTICAST_LIST][ETH_ALEN];
+	u8 multi_bits[HW_MULTICAST_SIZE];
+	u8 multi_list_size;
+
+	u8 enabled;
+	u8 rx_stop;
+	u8 reserved2[1];
+
+	uint features;
+	uint overrides;
+
+	void *parent;
+};
+
+enum {
+	PHY_NO_FLOW_CTRL,
+	PHY_FLOW_CTRL,
+	PHY_TX_ONLY,
+	PHY_RX_ONLY
+};
+
+/**
+ * struct ksz_port - Virtual port data structure
+ * @duplex:		Duplex mode setting.  1 for half duplex, 2 for full
+ * 			duplex, and 0 for auto, which normally results in full
+ * 			duplex.
+ * @speed:		Speed setting.  10 for 10 Mbit, 100 for 100 Mbit, and
+ * 			0 for auto, which normally results in 100 Mbit.
+ * @force_link:		Force link setting.  0 for auto-negotiation, and 1 for
+ * 			force.
+ * @flow_ctrl:		Flow control setting.  PHY_NO_FLOW_CTRL for no flow
+ * 			control, and PHY_FLOW_CTRL for flow control.
+ * 			PHY_TX_ONLY and PHY_RX_ONLY are not supported for 100
+ * 			Mbit PHY.
+ * @first_port:		Index of first port this port supports.
+ * @mib_port_cnt:	Number of ports with MIB counters.
+ * @port_cnt:		Number of ports this port supports.
+ * @counter:		Port statistics counter.
+ * @hw:			Pointer to hardware structure.
+ * @linked:		Pointer to port information linked to this port.
+ */
+struct ksz_port {
+	u8 duplex;
+	u8 speed;
+	u8 force_link;
+	u8 flow_ctrl;
+
+	int first_port;
+	int mib_port_cnt;
+	int port_cnt;
+	u64 counter[OID_COUNTER_LAST];
+
+	struct ksz_hw *hw;
+	struct ksz_port_info *linked;
+};
+
+/**
+ * struct ksz_timer_info - Timer information data structure
+ * @timer:	Kernel timer.
+ * @cnt:	Running timer counter.
+ * @max:	Number of times to run timer; -1 for infinity.
+ * @period:	Timer period in jiffies.
+ */
+struct ksz_timer_info {
+	struct timer_list timer;
+	int cnt;
+	int max;
+	int period;
+};
+
+/**
+ * struct ksz_shared_mem - OS dependent shared memory data structure
+ * @dma_addr:	Physical DMA address allocated.
+ * @alloc_size:	Allocation size.
+ * @phys:	Actual physical address used.
+ * @alloc_virt:	Virtual address allocated.
+ * @virt:	Actual virtual address used.
+ */
+struct ksz_shared_mem {
+	dma_addr_t dma_addr;
+	uint alloc_size;
+	uint phys;
+	u8 *alloc_virt;
+	u8 *virt;
+};
+
+/**
+ * struct ksz_counter_info - OS dependent counter information data structure
+ * @counter:	Wait queue to wakeup after counters are read.
+ * @time:	Next time in jiffies to read counter.
+ * @read:	Indication of counters read in full or not.
+ */
+struct ksz_counter_info {
+	wait_queue_head_t counter;
+	unsigned long time;
+	int read;
+};
+
+/**
+ * struct dev_info - Network device information data structure
+ * @dev:		Pointer to network device.
+ * @pdev:		Pointer to PCI device.
+ * @hw:			Hardware structure.
+ * @desc_pool:		Physical memory used for descriptor pool.
+ * @hwlock:		Spinlock to prevent hardware from accessing.
+ * @lock:		Mutex lock to prevent device from accessing.
+ * @dev_rcv:		Receive process function used.
+ * @last_skb:		Socket buffer allocated for descriptor rx fragments.
+ * @skb_index:		Buffer index for receiving fragments.
+ * @skb_len:		Buffer length for receiving fragments.
+ * @mib_read:		Workqueue to read MIB counters.
+ * @mib_timer_info:	Timer to read MIB counters.
+ * @counter:		Used for MIB reading.
+ * @mtu:		Current MTU used.  The default is REGULAR_RX_BUF_SIZE;
+ * 			the maximum is MAX_RX_BUF_SIZE.
+ * @opened:		Counter to keep track of device open.
+ * @rx_tasklet:		Receive processing tasklet.
+ * @tx_tasklet:		Transmit processing tasklet.
+ * @wol_enable:		Wake-on-LAN enable set by ethtool.
+ * @wol_support:	Wake-on-LAN support used by ethtool.
+ * @pme_wait:		Used for KSZ8841 power management.
+ */
+struct dev_info {
+	struct net_device *dev;
+	struct pci_dev *pdev;
+
+	struct ksz_hw hw;
+	struct ksz_shared_mem desc_pool;
+
+	spinlock_t hwlock;
+	struct mutex lock;
+
+	int (*dev_rcv)(struct dev_info *);
+
+	struct sk_buff *last_skb;
+	int skb_index;
+	int skb_len;
+
+	struct work_struct mib_read;
+	struct ksz_timer_info mib_timer_info;
+	struct ksz_counter_info counter[TOTAL_PORT_NUM];
+
+	int mtu;
+	int opened;
+
+	struct tasklet_struct rx_tasklet;
+	struct tasklet_struct tx_tasklet;
+
+	int wol_enable;
+	int wol_support;
+	unsigned long pme_wait;
+};
+
+/**
+ * struct dev_priv - Network device private data structure
+ * @adapter:		Adapter device information.
+ * @port:		Port information.
+ * @monitor_timer_info:	Timer to monitor ports.
+ * @proc_sem:		Semaphore for proc accessing.
+ * @id:			Device ID.
+ * @mii_if:		MII interface information.
+ * @advertising:	Temporary variable to store advertised settings.
+ * @msg_enable:		The message flags controlling driver output.
+ * @media_state:	The connection status of the device.
+ * @multicast:		The all multicast state of the device.
+ * @promiscuous:	The promiscuous state of the device.
+ */
+struct dev_priv {
+	struct dev_info *adapter;
+	struct ksz_port port;
+	struct ksz_timer_info monitor_timer_info;
+
+	struct semaphore proc_sem;
+	int id;
+
+	struct mii_if_info mii_if;
+	u32 advertising;
+
+	u32 msg_enable;
+	int media_state;
+	int multicast;
+	int promiscuous;
+};
+
+#define DRV_NAME		"KSZ884X PCI"
+#define DEVICE_NAME		"KSZ884x PCI"
+#define DRV_VERSION		"1.0.0"
+#define DRV_RELDATE		"Feb 8, 2010"
+
+static char version[] =
+	"Micrel " DEVICE_NAME " " DRV_VERSION " (" DRV_RELDATE ")";
+
+static u8 DEFAULT_MAC_ADDRESS[] = { 0x00, 0x10, 0xA1, 0x88, 0x42, 0x01 };
+
+/*
+ * Interrupt processing primary routines
+ */
+
+static inline void hw_ack_intr(struct ksz_hw *hw, uint interrupt)
+{
+	writel(interrupt, hw->io + KS884X_INTERRUPTS_STATUS);
+}
+
+static inline void hw_dis_intr(struct ksz_hw *hw)
+{
+	hw->intr_blocked = hw->intr_mask;
+	writel(0, hw->io + KS884X_INTERRUPTS_ENABLE);
+	hw->intr_set = readl(hw->io + KS884X_INTERRUPTS_ENABLE);
+}
+
+static inline void hw_set_intr(struct ksz_hw *hw, uint interrupt)
+{
+	hw->intr_set = interrupt;
+	writel(interrupt, hw->io + KS884X_INTERRUPTS_ENABLE);
+}
+
+static inline void hw_ena_intr(struct ksz_hw *hw)
+{
+	hw->intr_blocked = 0;
+	hw_set_intr(hw, hw->intr_mask);
+}
+
+static inline void hw_dis_intr_bit(struct ksz_hw *hw, uint bit)
+{
+	hw->intr_mask &= ~(bit);
+}
+
+static inline void hw_turn_off_intr(struct ksz_hw *hw, uint interrupt)
+{
+	u32 read_intr;
+
+	read_intr = readl(hw->io + KS884X_INTERRUPTS_ENABLE);
+	hw->intr_set = read_intr & ~interrupt;
+	writel(hw->intr_set, hw->io + KS884X_INTERRUPTS_ENABLE);
+	hw_dis_intr_bit(hw, interrupt);
+}
+
+/**
+ * hw_turn_on_intr - turn on specified interrupts
+ * @hw: 	The hardware instance.
+ * @bit:	The interrupt bits to be on.
+ *
+ * This routine turns on the specified interrupts in the interrupt mask so that
+ * those interrupts will be enabled.
+ */
+static void hw_turn_on_intr(struct ksz_hw *hw, u32 bit)
+{
+	hw->intr_mask |= bit;
+
+	if (!hw->intr_blocked)
+		hw_set_intr(hw, hw->intr_mask);
+}
+
+static inline void hw_ena_intr_bit(struct ksz_hw *hw, uint interrupt)
+{
+	u32 read_intr;
+
+	read_intr = readl(hw->io + KS884X_INTERRUPTS_ENABLE);
+	hw->intr_set = read_intr | interrupt;
+	writel(hw->intr_set, hw->io + KS884X_INTERRUPTS_ENABLE);
+}
+
+static inline void hw_read_intr(struct ksz_hw *hw, uint *status)
+{
+	*status = readl(hw->io + KS884X_INTERRUPTS_STATUS);
+	*status = *status & hw->intr_set;
+}
+
+static inline void hw_restore_intr(struct ksz_hw *hw, uint interrupt)
+{
+	if (interrupt)
+		hw_ena_intr(hw);
+}
+
+/**
+ * hw_block_intr - block hardware interrupts
+ * @hw: The hardware instance.
+ *
+ * This function blocks all interrupts of the hardware and returns the current
+ * interrupt enable mask so that interrupts can be restored later.
+ *
+ * Return the current interrupt enable mask.
+ */
+static uint hw_block_intr(struct ksz_hw *hw)
+{
+	uint interrupt = 0;
+
+	if (!hw->intr_blocked) {
+		hw_dis_intr(hw);
+		interrupt = hw->intr_blocked;
+	}
+	return interrupt;
+}
+
+/*
+ * Hardware descriptor routines
+ */
+
+static inline void reset_desc(struct ksz_desc *desc, union desc_stat status)
+{
+	status.rx.hw_owned = 0;
+	desc->phw->ctrl.data = cpu_to_le32(status.data);
+}
+
+static inline void release_desc(struct ksz_desc *desc)
+{
+	desc->sw.ctrl.tx.hw_owned = 1;
+	if (desc->sw.buf_size != desc->sw.buf.data) {
+		desc->sw.buf_size = desc->sw.buf.data;
+		desc->phw->buf.data = cpu_to_le32(desc->sw.buf.data);
+	}
+	desc->phw->ctrl.data = cpu_to_le32(desc->sw.ctrl.data);
+}
+
+static void get_rx_pkt(struct ksz_desc_info *info, struct ksz_desc **desc)
+{
+	*desc = &info->ring[info->last];
+	info->last++;
+	info->last &= info->mask;
+	info->avail--;
+	(*desc)->sw.buf.data &= ~KS_DESC_RX_MASK;
+}
+
+static inline void set_rx_buf(struct ksz_desc *desc, u32 addr)
+{
+	desc->phw->addr = cpu_to_le32(addr);
+}
+
+static inline void set_rx_len(struct ksz_desc *desc, u32 len)
+{
+	desc->sw.buf.rx.buf_size = len;
+}
+
+static inline void get_tx_pkt(struct ksz_desc_info *info,
+	struct ksz_desc **desc)
+{
+	*desc = &info->ring[info->next];
+	info->next++;
+	info->next &= info->mask;
+	info->avail--;
+	(*desc)->sw.buf.data &= ~KS_DESC_TX_MASK;
+}
+
+static inline void set_tx_buf(struct ksz_desc *desc, u32 addr)
+{
+	desc->phw->addr = cpu_to_le32(addr);
+}
+
+static inline void set_tx_len(struct ksz_desc *desc, u32 len)
+{
+	desc->sw.buf.tx.buf_size = len;
+}
+
+/* Switch functions */
+
+#define TABLE_READ			0x10
+#define TABLE_SEL_SHIFT			2
+
+#define HW_DELAY(hw, reg)			\
+	do {					\
+		readw(hw->io + reg);		\
+	} while (0)
+
+/**
+ * sw_r_table - read 4 bytes of data from switch table
+ * @hw:		The hardware instance.
+ * @table:	The table selector.
+ * @addr:	The address of the table entry.
+ * @data:	Buffer to store the read data.
+ *
+ * This routine reads 4 bytes of data from the table of the switch.
+ * Hardware interrupts are disabled to minimize corruption of read data.
+ */
+static void sw_r_table(struct ksz_hw *hw, int table, u16 addr, u32 *data)
+{
+	u16 ctrl_addr;
+	uint interrupt;
+
+	ctrl_addr = (((table << TABLE_SEL_SHIFT) | TABLE_READ) << 8) | addr;
+
+	interrupt = hw_block_intr(hw);
+
+	writew(ctrl_addr, hw->io + KS884X_IACR_OFFSET);
+	HW_DELAY(hw, KS884X_IACR_OFFSET);
+	*data = readl(hw->io + KS884X_ACC_DATA_0_OFFSET);
+
+	hw_restore_intr(hw, interrupt);
+}
+
+/**
+ * sw_w_table_64 - write 8 bytes of data to the switch table
+ * @hw:		The hardware instance.
+ * @table:	The table selector.
+ * @addr:	The address of the table entry.
+ * @data_hi:	The high part of data to be written (bit63 ~ bit32).
+ * @data_lo:	The low part of data to be written (bit31 ~ bit0).
+ *
+ * This routine writes 8 bytes of data to the table of the switch.
+ * Hardware interrupts are disabled to minimize corruption of written data.
+ */
+static void sw_w_table_64(struct ksz_hw *hw, int table, u16 addr, u32 data_hi,
+	u32 data_lo)
+{
+	u16 ctrl_addr;
+	uint interrupt;
+
+	ctrl_addr = ((table << TABLE_SEL_SHIFT) << 8) | addr;
+
+	interrupt = hw_block_intr(hw);
+
+	writel(data_hi, hw->io + KS884X_ACC_DATA_4_OFFSET);
+	writel(data_lo, hw->io + KS884X_ACC_DATA_0_OFFSET);
+
+	writew(ctrl_addr, hw->io + KS884X_IACR_OFFSET);
+	HW_DELAY(hw, KS884X_IACR_OFFSET);
+
+	hw_restore_intr(hw, interrupt);
+}
+
+/**
+ * sw_w_sta_mac_table - write to the static MAC table
+ * @hw: 	The hardware instance.
+ * @addr:	The address of the table entry.
+ * @mac_addr:	The MAC address.
+ * @ports:	The port members.
+ * @override:	The flag to override the port receive/transmit settings.
+ * @valid:	The flag to indicate entry is valid.
+ * @use_fid:	The flag to indicate the FID is valid.
+ * @fid:	The FID value.
+ *
+ * This routine writes an entry of the static MAC table of the switch.  It
+ * calls sw_w_table_64() to write the data.
+ */
+static void sw_w_sta_mac_table(struct ksz_hw *hw, u16 addr, u8 *mac_addr,
+	u8 ports, int override, int valid, int use_fid, u8 fid)
+{
+	u32 data_hi;
+	u32 data_lo;
+
+	data_lo = ((u32) mac_addr[2] << 24) |
+		((u32) mac_addr[3] << 16) |
+		((u32) mac_addr[4] << 8) | mac_addr[5];
+	data_hi = ((u32) mac_addr[0] << 8) | mac_addr[1];
+	data_hi |= (u32) ports << STATIC_MAC_FWD_PORTS_SHIFT;
+
+	if (override)
+		data_hi |= STATIC_MAC_TABLE_OVERRIDE;
+	if (use_fid) {
+		data_hi |= STATIC_MAC_TABLE_USE_FID;
+		data_hi |= (u32) fid << STATIC_MAC_FID_SHIFT;
+	}
+	if (valid)
+		data_hi |= STATIC_MAC_TABLE_VALID;
+
+	sw_w_table_64(hw, TABLE_STATIC_MAC, addr, data_hi, data_lo);
+}
+
+/**
+ * sw_r_vlan_table - read from the VLAN table
+ * @hw: 	The hardware instance.
+ * @addr:	The address of the table entry.
+ * @vid:	Buffer to store the VID.
+ * @fid:	Buffer to store the VID.
+ * @member:	Buffer to store the port membership.
+ *
+ * This function reads an entry of the VLAN table of the switch.  It calls
+ * sw_r_table() to get the data.
+ *
+ * Return 0 if the entry is valid; otherwise -1.
+ */
+static int sw_r_vlan_table(struct ksz_hw *hw, u16 addr, u16 *vid, u8 *fid,
+	u8 *member)
+{
+	u32 data;
+
+	sw_r_table(hw, TABLE_VLAN, addr, &data);
+	if (data & VLAN_TABLE_VALID) {
+		*vid = (u16)(data & VLAN_TABLE_VID);
+		*fid = (u8)((data & VLAN_TABLE_FID) >> VLAN_TABLE_FID_SHIFT);
+		*member = (u8)((data & VLAN_TABLE_MEMBERSHIP) >>
+			VLAN_TABLE_MEMBERSHIP_SHIFT);
+		return 0;
+	}
+	return -1;
+}
+
+/**
+ * port_r_mib_cnt - read MIB counter
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ * @addr:	The address of the counter.
+ * @cnt:	Buffer to store the counter.
+ *
+ * This routine reads a MIB counter of the port.
+ * Hardware interrupts are disabled to minimize corruption of read data.
+ */
+static void port_r_mib_cnt(struct ksz_hw *hw, int port, u16 addr, u64 *cnt)
+{
+	u32 data;
+	u16 ctrl_addr;
+	uint interrupt;
+	int timeout;
+
+	ctrl_addr = addr + PORT_COUNTER_NUM * port;
+
+	interrupt = hw_block_intr(hw);
+
+	ctrl_addr |= (((TABLE_MIB << TABLE_SEL_SHIFT) | TABLE_READ) << 8);
+	writew(ctrl_addr, hw->io + KS884X_IACR_OFFSET);
+	HW_DELAY(hw, KS884X_IACR_OFFSET);
+
+	for (timeout = 100; timeout > 0; timeout--) {
+		data = readl(hw->io + KS884X_ACC_DATA_0_OFFSET);
+
+		if (data & MIB_COUNTER_VALID) {
+			if (data & MIB_COUNTER_OVERFLOW)
+				*cnt += MIB_COUNTER_VALUE + 1;
+			*cnt += data & MIB_COUNTER_VALUE;
+			break;
+		}
+	}
+
+	hw_restore_intr(hw, interrupt);
+}
+
+/**
+ * port_r_mib_pkt - read dropped packet counts
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ * @last:	last one
+ * @cnt:	Buffer to store the receive and transmit dropped packet counts.
+ *
+ * This routine reads the dropped packet counts of the port.
+ * Hardware interrupts are disabled to minimize corruption of read data.
+ */
+static void port_r_mib_pkt(struct ksz_hw *hw, int port, u32 *last, u64 *cnt)
+{
+	u32 cur;
+	u32 data;
+	u16 ctrl_addr;
+	uint interrupt;
+	int index;
+
+	index = KS_MIB_PACKET_DROPPED_RX_0 + port;
+	do {
+		interrupt = hw_block_intr(hw);
+
+		ctrl_addr = (u16) index;
+		ctrl_addr |= (((TABLE_MIB << TABLE_SEL_SHIFT) | TABLE_READ)
+			<< 8);
+		writew(ctrl_addr, hw->io + KS884X_IACR_OFFSET);
+		HW_DELAY(hw, KS884X_IACR_OFFSET);
+		data = readl(hw->io + KS884X_ACC_DATA_0_OFFSET);
+
+		hw_restore_intr(hw, interrupt);
+
+		data &= MIB_PACKET_DROPPED;
+		cur = *last;
+		if (data != cur) {
+			*last = data;
+			if (data < cur)
+				data += MIB_PACKET_DROPPED + 1;
+			data -= cur;
+			*cnt += data;
+		}
+		++last;
+		++cnt;
+		index -= KS_MIB_PACKET_DROPPED_TX -
+			KS_MIB_PACKET_DROPPED_TX_0 + 1;
+	} while (index >= KS_MIB_PACKET_DROPPED_TX_0 + port);
+}
+
+/**
+ * port_r_cnt - read MIB counters periodically
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ *
+ * This routine is used to read the counters of the port periodically to avoid
+ * counter overflow.  The hardware should be acquired first before calling this
+ * routine.
+ *
+ * Return non-zero when not all counters not read.
+ */
+static int port_r_cnt(struct ksz_hw *hw, int port)
+{
+	struct ksz_port_mib *mib = &hw->port_mib[port];
+
+	if (mib->mib_start < PORT_COUNTER_NUM)
+		while (mib->cnt_ptr < PORT_COUNTER_NUM) {
+			port_r_mib_cnt(hw, port, mib->cnt_ptr,
+				&mib->counter[mib->cnt_ptr]);
+			++mib->cnt_ptr;
+		}
+	if (hw->mib_cnt > PORT_COUNTER_NUM)
+		port_r_mib_pkt(hw, port, mib->dropped,
+			&mib->counter[PORT_COUNTER_NUM]);
+	mib->cnt_ptr = 0;
+	return 0;
+}
+
+/**
+ * port_init_cnt - initialize MIB counter values
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ *
+ * This routine is used to initialize all counters to zero if the hardware
+ * cannot do it after reset.
+ */
+static void port_init_cnt(struct ksz_hw *hw, int port)
+{
+	struct ksz_port_mib *mib = &hw->port_mib[port];
+
+	mib->cnt_ptr = 0;
+	if (mib->mib_start < PORT_COUNTER_NUM)
+		do {
+			port_r_mib_cnt(hw, port, mib->cnt_ptr,
+				&mib->counter[mib->cnt_ptr]);
+			++mib->cnt_ptr;
+		} while (mib->cnt_ptr < PORT_COUNTER_NUM);
+	if (hw->mib_cnt > PORT_COUNTER_NUM)
+		port_r_mib_pkt(hw, port, mib->dropped,
+			&mib->counter[PORT_COUNTER_NUM]);
+	memset((void *) mib->counter, 0, sizeof(u64) * TOTAL_PORT_COUNTER_NUM);
+	mib->cnt_ptr = 0;
+}
+
+/*
+ * Port functions
+ */
+
+/**
+ * port_chk - check port register bits
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ * @offset:	The offset of the port register.
+ * @bits:	The data bits to check.
+ *
+ * This function checks whether the specified bits of the port register are set
+ * or not.
+ *
+ * Return 0 if the bits are not set.
+ */
+static int port_chk(struct ksz_hw *hw, int port, int offset, u16 bits)
+{
+	u32 addr;
+	u16 data;
+
+	PORT_CTRL_ADDR(port, addr);
+	addr += offset;
+	data = readw(hw->io + addr);
+	return (data & bits) == bits;
+}
+
+/**
+ * port_cfg - set port register bits
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ * @offset:	The offset of the port register.
+ * @bits:	The data bits to set.
+ * @set:	The flag indicating whether the bits are to be set or not.
+ *
+ * This routine sets or resets the specified bits of the port register.
+ */
+static void port_cfg(struct ksz_hw *hw, int port, int offset, u16 bits,
+	int set)
+{
+	u32 addr;
+	u16 data;
+
+	PORT_CTRL_ADDR(port, addr);
+	addr += offset;
+	data = readw(hw->io + addr);
+	if (set)
+		data |= bits;
+	else
+		data &= ~bits;
+	writew(data, hw->io + addr);
+}
+
+/**
+ * port_chk_shift - check port bit
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ * @addr:	The offset of the register.
+ * @shift:	Number of bits to shift.
+ *
+ * This function checks whether the specified port is set in the register or
+ * not.
+ *
+ * Return 0 if the port is not set.
+ */
+static int port_chk_shift(struct ksz_hw *hw, int port, u32 addr, int shift)
+{
+	u16 data;
+	u16 bit = 1 << port;
+
+	data = readw(hw->io + addr);
+	data >>= shift;
+	return (data & bit) == bit;
+}
+
+/**
+ * port_cfg_shift - set port bit
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ * @addr:	The offset of the register.
+ * @shift:	Number of bits to shift.
+ * @set:	The flag indicating whether the port is to be set or not.
+ *
+ * This routine sets or resets the specified port in the register.
+ */
+static void port_cfg_shift(struct ksz_hw *hw, int port, u32 addr, int shift,
+	int set)
+{
+	u16 data;
+	u16 bits = 1 << port;
+
+	data = readw(hw->io + addr);
+	bits <<= shift;
+	if (set)
+		data |= bits;
+	else
+		data &= ~bits;
+	writew(data, hw->io + addr);
+}
+
+/**
+ * port_r8 - read byte from port register
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ * @offset:	The offset of the port register.
+ * @data:	Buffer to store the data.
+ *
+ * This routine reads a byte from the port register.
+ */
+static void port_r8(struct ksz_hw *hw, int port, int offset, u8 *data)
+{
+	u32 addr;
+
+	PORT_CTRL_ADDR(port, addr);
+	addr += offset;
+	*data = readb(hw->io + addr);
+}
+
+/**
+ * port_r16 - read word from port register.
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ * @offset:	The offset of the port register.
+ * @data:	Buffer to store the data.
+ *
+ * This routine reads a word from the port register.
+ */
+static void port_r16(struct ksz_hw *hw, int port, int offset, u16 *data)
+{
+	u32 addr;
+
+	PORT_CTRL_ADDR(port, addr);
+	addr += offset;
+	*data = readw(hw->io + addr);
+}
+
+/**
+ * port_w16 - write word to port register.
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ * @offset:	The offset of the port register.
+ * @data:	Data to write.
+ *
+ * This routine writes a word to the port register.
+ */
+static void port_w16(struct ksz_hw *hw, int port, int offset, u16 data)
+{
+	u32 addr;
+
+	PORT_CTRL_ADDR(port, addr);
+	addr += offset;
+	writew(data, hw->io + addr);
+}
+
+/**
+ * sw_chk - check switch register bits
+ * @hw: 	The hardware instance.
+ * @addr:	The address of the switch register.
+ * @bits:	The data bits to check.
+ *
+ * This function checks whether the specified bits of the switch register are
+ * set or not.
+ *
+ * Return 0 if the bits are not set.
+ */
+static int sw_chk(struct ksz_hw *hw, u32 addr, u16 bits)
+{
+	u16 data;
+
+	data = readw(hw->io + addr);
+	return (data & bits) == bits;
+}
+
+/**
+ * sw_cfg - set switch register bits
+ * @hw: 	The hardware instance.
+ * @addr:	The address of the switch register.
+ * @bits:	The data bits to set.
+ * @set:	The flag indicating whether the bits are to be set or not.
+ *
+ * This function sets or resets the specified bits of the switch register.
+ */
+static void sw_cfg(struct ksz_hw *hw, u32 addr, u16 bits, int set)
+{
+	u16 data;
+
+	data = readw(hw->io + addr);
+	if (set)
+		data |= bits;
+	else
+		data &= ~bits;
+	writew(data, hw->io + addr);
+}
+
+/* Bandwidth */
+
+static inline void port_cfg_broad_storm(struct ksz_hw *hw, int p, int set)
+{
+	port_cfg(hw, p,
+		KS8842_PORT_CTRL_1_OFFSET, PORT_BROADCAST_STORM, set);
+}
+
+static inline int port_chk_broad_storm(struct ksz_hw *hw, int p)
+{
+	return port_chk(hw, p,
+		KS8842_PORT_CTRL_1_OFFSET, PORT_BROADCAST_STORM);
+}
+
+/* Driver set switch broadcast storm protection at 10% rate. */
+#define BROADCAST_STORM_PROTECTION_RATE	10
+
+/* 148,800 frames * 67 ms / 100 */
+#define BROADCAST_STORM_VALUE		9969
+
+/**
+ * sw_cfg_broad_storm - configure broadcast storm threshold
+ * @hw: 	The hardware instance.
+ * @percent:	Broadcast storm threshold in percent of transmit rate.
+ *
+ * This routine configures the broadcast storm threshold of the switch.
+ */
+static void sw_cfg_broad_storm(struct ksz_hw *hw, u8 percent)
+{
+	u16 data;
+	u32 value = ((u32) BROADCAST_STORM_VALUE * (u32) percent / 100);
+
+	if (value > BROADCAST_STORM_RATE)
+		value = BROADCAST_STORM_RATE;
+
+	data = readw(hw->io + KS8842_SWITCH_CTRL_3_OFFSET);
+	data &= ~(BROADCAST_STORM_RATE_LO | BROADCAST_STORM_RATE_HI);
+	data |= ((value & 0x00FF) << 8) | ((value & 0xFF00) >> 8);
+	writew(data, hw->io + KS8842_SWITCH_CTRL_3_OFFSET);
+}
+
+/**
+ * sw_get_board_storm - get broadcast storm threshold
+ * @hw: 	The hardware instance.
+ * @percent:	Buffer to store the broadcast storm threshold percentage.
+ *
+ * This routine retrieves the broadcast storm threshold of the switch.
+ */
+static void sw_get_broad_storm(struct ksz_hw *hw, u8 *percent)
+{
+	int num;
+	u16 data;
+
+	data = readw(hw->io + KS8842_SWITCH_CTRL_3_OFFSET);
+	num = (data & BROADCAST_STORM_RATE_HI);
+	num <<= 8;
+	num |= (data & BROADCAST_STORM_RATE_LO) >> 8;
+	num = DIV_ROUND_CLOSEST(num * 100, BROADCAST_STORM_VALUE);
+	*percent = (u8) num;
+}
+
+/**
+ * sw_dis_broad_storm - disable broadstorm
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ *
+ * This routine disables the broadcast storm limit function of the switch.
+ */
+static void sw_dis_broad_storm(struct ksz_hw *hw, int port)
+{
+	port_cfg_broad_storm(hw, port, 0);
+}
+
+/**
+ * sw_ena_broad_storm - enable broadcast storm
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ *
+ * This routine enables the broadcast storm limit function of the switch.
+ */
+static void sw_ena_broad_storm(struct ksz_hw *hw, int port)
+{
+	sw_cfg_broad_storm(hw, hw->ksz_switch->broad_per);
+	port_cfg_broad_storm(hw, port, 1);
+}
+
+/**
+ * sw_init_broad_storm - initialize broadcast storm
+ * @hw: 	The hardware instance.
+ *
+ * This routine initializes the broadcast storm limit function of the switch.
+ */
+static void sw_init_broad_storm(struct ksz_hw *hw)
+{
+	int port;
+
+	hw->ksz_switch->broad_per = 1;
+	sw_cfg_broad_storm(hw, hw->ksz_switch->broad_per);
+	for (port = 0; port < TOTAL_PORT_NUM; port++)
+		sw_dis_broad_storm(hw, port);
+	sw_cfg(hw, KS8842_SWITCH_CTRL_2_OFFSET, MULTICAST_STORM_DISABLE, 1);
+}
+
+/**
+ * hw_cfg_broad_storm - configure broadcast storm
+ * @hw: 	The hardware instance.
+ * @percent:	Broadcast storm threshold in percent of transmit rate.
+ *
+ * This routine configures the broadcast storm threshold of the switch.
+ * It is called by user functions.  The hardware should be acquired first.
+ */
+static void hw_cfg_broad_storm(struct ksz_hw *hw, u8 percent)
+{
+	if (percent > 100)
+		percent = 100;
+
+	sw_cfg_broad_storm(hw, percent);
+	sw_get_broad_storm(hw, &percent);
+	hw->ksz_switch->broad_per = percent;
+}
+
+/**
+ * sw_dis_prio_rate - disable switch priority rate
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ *
+ * This routine disables the priority rate function of the switch.
+ */
+static void sw_dis_prio_rate(struct ksz_hw *hw, int port)
+{
+	u32 addr;
+
+	PORT_CTRL_ADDR(port, addr);
+	addr += KS8842_PORT_IN_RATE_OFFSET;
+	writel(0, hw->io + addr);
+}
+
+/**
+ * sw_init_prio_rate - initialize switch prioirty rate
+ * @hw: 	The hardware instance.
+ *
+ * This routine initializes the priority rate function of the switch.
+ */
+static void sw_init_prio_rate(struct ksz_hw *hw)
+{
+	int port;
+	int prio;
+	struct ksz_switch *sw = hw->ksz_switch;
+
+	for (port = 0; port < TOTAL_PORT_NUM; port++) {
+		for (prio = 0; prio < PRIO_QUEUES; prio++) {
+			sw->port_cfg[port].rx_rate[prio] =
+			sw->port_cfg[port].tx_rate[prio] = 0;
+		}
+		sw_dis_prio_rate(hw, port);
+	}
+}
+
+/* Communication */
+
+static inline void port_cfg_back_pressure(struct ksz_hw *hw, int p, int set)
+{
+	port_cfg(hw, p,
+		KS8842_PORT_CTRL_2_OFFSET, PORT_BACK_PRESSURE, set);
+}
+
+static inline void port_cfg_force_flow_ctrl(struct ksz_hw *hw, int p, int set)
+{
+	port_cfg(hw, p,
+		KS8842_PORT_CTRL_2_OFFSET, PORT_FORCE_FLOW_CTRL, set);
+}
+
+static inline int port_chk_back_pressure(struct ksz_hw *hw, int p)
+{
+	return port_chk(hw, p,
+		KS8842_PORT_CTRL_2_OFFSET, PORT_BACK_PRESSURE);
+}
+
+static inline int port_chk_force_flow_ctrl(struct ksz_hw *hw, int p)
+{
+	return port_chk(hw, p,
+		KS8842_PORT_CTRL_2_OFFSET, PORT_FORCE_FLOW_CTRL);
+}
+
+/* Spanning Tree */
+
+static inline void port_cfg_rx(struct ksz_hw *hw, int p, int set)
+{
+	port_cfg(hw, p,
+		KS8842_PORT_CTRL_2_OFFSET, PORT_RX_ENABLE, set);
+}
+
+static inline void port_cfg_tx(struct ksz_hw *hw, int p, int set)
+{
+	port_cfg(hw, p,
+		KS8842_PORT_CTRL_2_OFFSET, PORT_TX_ENABLE, set);
+}
+
+static inline void sw_cfg_fast_aging(struct ksz_hw *hw, int set)
+{
+	sw_cfg(hw, KS8842_SWITCH_CTRL_1_OFFSET, SWITCH_FAST_AGING, set);
+}
+
+static inline void sw_flush_dyn_mac_table(struct ksz_hw *hw)
+{
+	if (!(hw->overrides & FAST_AGING)) {
+		sw_cfg_fast_aging(hw, 1);
+		mdelay(1);
+		sw_cfg_fast_aging(hw, 0);
+	}
+}
+
+/* VLAN */
+
+static inline void port_cfg_ins_tag(struct ksz_hw *hw, int p, int insert)
+{
+	port_cfg(hw, p,
+		KS8842_PORT_CTRL_1_OFFSET, PORT_INSERT_TAG, insert);
+}
+
+static inline void port_cfg_rmv_tag(struct ksz_hw *hw, int p, int remove)
+{
+	port_cfg(hw, p,
+		KS8842_PORT_CTRL_1_OFFSET, PORT_REMOVE_TAG, remove);
+}
+
+static inline int port_chk_ins_tag(struct ksz_hw *hw, int p)
+{
+	return port_chk(hw, p,
+		KS8842_PORT_CTRL_1_OFFSET, PORT_INSERT_TAG);
+}
+
+static inline int port_chk_rmv_tag(struct ksz_hw *hw, int p)
+{
+	return port_chk(hw, p,
+		KS8842_PORT_CTRL_1_OFFSET, PORT_REMOVE_TAG);
+}
+
+static inline void port_cfg_dis_non_vid(struct ksz_hw *hw, int p, int set)
+{
+	port_cfg(hw, p,
+		KS8842_PORT_CTRL_2_OFFSET, PORT_DISCARD_NON_VID, set);
+}
+
+static inline void port_cfg_in_filter(struct ksz_hw *hw, int p, int set)
+{
+	port_cfg(hw, p,
+		KS8842_PORT_CTRL_2_OFFSET, PORT_INGRESS_VLAN_FILTER, set);
+}
+
+static inline int port_chk_dis_non_vid(struct ksz_hw *hw, int p)
+{
+	return port_chk(hw, p,
+		KS8842_PORT_CTRL_2_OFFSET, PORT_DISCARD_NON_VID);
+}
+
+static inline int port_chk_in_filter(struct ksz_hw *hw, int p)
+{
+	return port_chk(hw, p,
+		KS8842_PORT_CTRL_2_OFFSET, PORT_INGRESS_VLAN_FILTER);
+}
+
+/* Mirroring */
+
+static inline void port_cfg_mirror_sniffer(struct ksz_hw *hw, int p, int set)
+{
+	port_cfg(hw, p,
+		KS8842_PORT_CTRL_2_OFFSET, PORT_MIRROR_SNIFFER, set);
+}
+
+static inline void port_cfg_mirror_rx(struct ksz_hw *hw, int p, int set)
+{
+	port_cfg(hw, p,
+		KS8842_PORT_CTRL_2_OFFSET, PORT_MIRROR_RX, set);
+}
+
+static inline void port_cfg_mirror_tx(struct ksz_hw *hw, int p, int set)
+{
+	port_cfg(hw, p,
+		KS8842_PORT_CTRL_2_OFFSET, PORT_MIRROR_TX, set);
+}
+
+static inline void sw_cfg_mirror_rx_tx(struct ksz_hw *hw, int set)
+{
+	sw_cfg(hw, KS8842_SWITCH_CTRL_2_OFFSET, SWITCH_MIRROR_RX_TX, set);
+}
+
+static void sw_init_mirror(struct ksz_hw *hw)
+{
+	int port;
+
+	for (port = 0; port < TOTAL_PORT_NUM; port++) {
+		port_cfg_mirror_sniffer(hw, port, 0);
+		port_cfg_mirror_rx(hw, port, 0);
+		port_cfg_mirror_tx(hw, port, 0);
+	}
+	sw_cfg_mirror_rx_tx(hw, 0);
+}
+
+static inline void sw_cfg_unk_def_deliver(struct ksz_hw *hw, int set)
+{
+	sw_cfg(hw, KS8842_SWITCH_CTRL_7_OFFSET,
+		SWITCH_UNK_DEF_PORT_ENABLE, set);
+}
+
+static inline int sw_cfg_chk_unk_def_deliver(struct ksz_hw *hw)
+{
+	return sw_chk(hw, KS8842_SWITCH_CTRL_7_OFFSET,
+		SWITCH_UNK_DEF_PORT_ENABLE);
+}
+
+static inline void sw_cfg_unk_def_port(struct ksz_hw *hw, int port, int set)
+{
+	port_cfg_shift(hw, port, KS8842_SWITCH_CTRL_7_OFFSET, 0, set);
+}
+
+static inline int sw_chk_unk_def_port(struct ksz_hw *hw, int port)
+{
+	return port_chk_shift(hw, port, KS8842_SWITCH_CTRL_7_OFFSET, 0);
+}
+
+/* Priority */
+
+static inline void port_cfg_diffserv(struct ksz_hw *hw, int p, int set)
+{
+	port_cfg(hw, p,
+		KS8842_PORT_CTRL_1_OFFSET, PORT_DIFFSERV_ENABLE, set);
+}
+
+static inline void port_cfg_802_1p(struct ksz_hw *hw, int p, int set)
+{
+	port_cfg(hw, p,
+		KS8842_PORT_CTRL_1_OFFSET, PORT_802_1P_ENABLE, set);
+}
+
+static inline void port_cfg_replace_vid(struct ksz_hw *hw, int p, int set)
+{
+	port_cfg(hw, p,
+		KS8842_PORT_CTRL_2_OFFSET, PORT_USER_PRIORITY_CEILING, set);
+}
+
+static inline void port_cfg_prio(struct ksz_hw *hw, int p, int set)
+{
+	port_cfg(hw, p,
+		KS8842_PORT_CTRL_1_OFFSET, PORT_PRIO_QUEUE_ENABLE, set);
+}
+
+static inline int port_chk_diffserv(struct ksz_hw *hw, int p)
+{
+	return port_chk(hw, p,
+		KS8842_PORT_CTRL_1_OFFSET, PORT_DIFFSERV_ENABLE);
+}
+
+static inline int port_chk_802_1p(struct ksz_hw *hw, int p)
+{
+	return port_chk(hw, p,
+		KS8842_PORT_CTRL_1_OFFSET, PORT_802_1P_ENABLE);
+}
+
+static inline int port_chk_replace_vid(struct ksz_hw *hw, int p)
+{
+	return port_chk(hw, p,
+		KS8842_PORT_CTRL_2_OFFSET, PORT_USER_PRIORITY_CEILING);
+}
+
+static inline int port_chk_prio(struct ksz_hw *hw, int p)
+{
+	return port_chk(hw, p,
+		KS8842_PORT_CTRL_1_OFFSET, PORT_PRIO_QUEUE_ENABLE);
+}
+
+/**
+ * sw_dis_diffserv - disable switch DiffServ priority
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ *
+ * This routine disables the DiffServ priority function of the switch.
+ */
+static void sw_dis_diffserv(struct ksz_hw *hw, int port)
+{
+	port_cfg_diffserv(hw, port, 0);
+}
+
+/**
+ * sw_dis_802_1p - disable switch 802.1p priority
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ *
+ * This routine disables the 802.1p priority function of the switch.
+ */
+static void sw_dis_802_1p(struct ksz_hw *hw, int port)
+{
+	port_cfg_802_1p(hw, port, 0);
+}
+
+/**
+ * sw_cfg_replace_null_vid -
+ * @hw: 	The hardware instance.
+ * @set:	The flag to disable or enable.
+ *
+ */
+static void sw_cfg_replace_null_vid(struct ksz_hw *hw, int set)
+{
+	sw_cfg(hw, KS8842_SWITCH_CTRL_3_OFFSET, SWITCH_REPLACE_NULL_VID, set);
+}
+
+/**
+ * sw_cfg_replace_vid - enable switch 802.10 priority re-mapping
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ * @set:	The flag to disable or enable.
+ *
+ * This routine enables the 802.1p priority re-mapping function of the switch.
+ * That allows 802.1p priority field to be replaced with the port's default
+ * tag's priority value if the ingress packet's 802.1p priority has a higher
+ * priority than port's default tag's priority.
+ */
+static void sw_cfg_replace_vid(struct ksz_hw *hw, int port, int set)
+{
+	port_cfg_replace_vid(hw, port, set);
+}
+
+/**
+ * sw_cfg_port_based - configure switch port based priority
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ * @prio:	The priority to set.
+ *
+ * This routine configures the port based priority of the switch.
+ */
+static void sw_cfg_port_based(struct ksz_hw *hw, int port, u8 prio)
+{
+	u16 data;
+
+	if (prio > PORT_BASED_PRIORITY_BASE)
+		prio = PORT_BASED_PRIORITY_BASE;
+
+	hw->ksz_switch->port_cfg[port].port_prio = prio;
+
+	port_r16(hw, port, KS8842_PORT_CTRL_1_OFFSET, &data);
+	data &= ~PORT_BASED_PRIORITY_MASK;
+	data |= prio << PORT_BASED_PRIORITY_SHIFT;
+	port_w16(hw, port, KS8842_PORT_CTRL_1_OFFSET, data);
+}
+
+/**
+ * sw_dis_multi_queue - disable transmit multiple queues
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ *
+ * This routine disables the transmit multiple queues selection of the switch
+ * port.  Only single transmit queue on the port.
+ */
+static void sw_dis_multi_queue(struct ksz_hw *hw, int port)
+{
+	port_cfg_prio(hw, port, 0);
+}
+
+/**
+ * sw_init_prio - initialize switch priority
+ * @hw: 	The hardware instance.
+ *
+ * This routine initializes the switch QoS priority functions.
+ */
+static void sw_init_prio(struct ksz_hw *hw)
+{
+	int port;
+	int tos;
+	struct ksz_switch *sw = hw->ksz_switch;
+
+	/*
+	 * Init all the 802.1p tag priority value to be assigned to different
+	 * priority queue.
+	 */
+	sw->p_802_1p[0] = 0;
+	sw->p_802_1p[1] = 0;
+	sw->p_802_1p[2] = 1;
+	sw->p_802_1p[3] = 1;
+	sw->p_802_1p[4] = 2;
+	sw->p_802_1p[5] = 2;
+	sw->p_802_1p[6] = 3;
+	sw->p_802_1p[7] = 3;
+
+	/*
+	 * Init all the DiffServ priority value to be assigned to priority
+	 * queue 0.
+	 */
+	for (tos = 0; tos < DIFFSERV_ENTRIES; tos++)
+		sw->diffserv[tos] = 0;
+
+	/* All QoS functions disabled. */
+	for (port = 0; port < TOTAL_PORT_NUM; port++) {
+		sw_dis_multi_queue(hw, port);
+		sw_dis_diffserv(hw, port);
+		sw_dis_802_1p(hw, port);
+		sw_cfg_replace_vid(hw, port, 0);
+
+		sw->port_cfg[port].port_prio = 0;
+		sw_cfg_port_based(hw, port, sw->port_cfg[port].port_prio);
+	}
+	sw_cfg_replace_null_vid(hw, 0);
+}
+
+/**
+ * port_get_def_vid - get port default VID.
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ * @vid:	Buffer to store the VID.
+ *
+ * This routine retrieves the default VID of the port.
+ */
+static void port_get_def_vid(struct ksz_hw *hw, int port, u16 *vid)
+{
+	u32 addr;
+
+	PORT_CTRL_ADDR(port, addr);
+	addr += KS8842_PORT_CTRL_VID_OFFSET;
+	*vid = readw(hw->io + addr);
+}
+
+/**
+ * sw_init_vlan - initialize switch VLAN
+ * @hw: 	The hardware instance.
+ *
+ * This routine initializes the VLAN function of the switch.
+ */
+static void sw_init_vlan(struct ksz_hw *hw)
+{
+	int port;
+	int entry;
+	struct ksz_switch *sw = hw->ksz_switch;
+
+	/* Read 16 VLAN entries from device's VLAN table. */
+	for (entry = 0; entry < VLAN_TABLE_ENTRIES; entry++) {
+		sw_r_vlan_table(hw, entry,
+			&sw->vlan_table[entry].vid,
+			&sw->vlan_table[entry].fid,
+			&sw->vlan_table[entry].member);
+	}
+
+	for (port = 0; port < TOTAL_PORT_NUM; port++) {
+		port_get_def_vid(hw, port, &sw->port_cfg[port].vid);
+		sw->port_cfg[port].member = PORT_MASK;
+	}
+}
+
+/**
+ * sw_cfg_port_base_vlan - configure port-based VLAN membership
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ * @member:	The port-based VLAN membership.
+ *
+ * This routine configures the port-based VLAN membership of the port.
+ */
+static void sw_cfg_port_base_vlan(struct ksz_hw *hw, int port, u8 member)
+{
+	u32 addr;
+	u8 data;
+
+	PORT_CTRL_ADDR(port, addr);
+	addr += KS8842_PORT_CTRL_2_OFFSET;
+
+	data = readb(hw->io + addr);
+	data &= ~PORT_VLAN_MEMBERSHIP;
+	data |= (member & PORT_MASK);
+	writeb(data, hw->io + addr);
+
+	hw->ksz_switch->port_cfg[port].member = member;
+}
+
+/**
+ * sw_get_addr - get the switch MAC address.
+ * @hw: 	The hardware instance.
+ * @mac_addr:	Buffer to store the MAC address.
+ *
+ * This function retrieves the MAC address of the switch.
+ */
+static inline void sw_get_addr(struct ksz_hw *hw, u8 *mac_addr)
+{
+	int i;
+
+	for (i = 0; i < 6; i += 2) {
+		mac_addr[i] = readb(hw->io + KS8842_MAC_ADDR_0_OFFSET + i);
+		mac_addr[1 + i] = readb(hw->io + KS8842_MAC_ADDR_1_OFFSET + i);
+	}
+}
+
+/**
+ * sw_set_addr - configure switch MAC address
+ * @hw: 	The hardware instance.
+ * @mac_addr:	The MAC address.
+ *
+ * This function configures the MAC address of the switch.
+ */
+static void sw_set_addr(struct ksz_hw *hw, u8 *mac_addr)
+{
+	int i;
+
+	for (i = 0; i < 6; i += 2) {
+		writeb(mac_addr[i], hw->io + KS8842_MAC_ADDR_0_OFFSET + i);
+		writeb(mac_addr[1 + i], hw->io + KS8842_MAC_ADDR_1_OFFSET + i);
+	}
+}
+
+/**
+ * sw_set_global_ctrl - set switch global control
+ * @hw: 	The hardware instance.
+ *
+ * This routine sets the global control of the switch function.
+ */
+static void sw_set_global_ctrl(struct ksz_hw *hw)
+{
+	u16 data;
+
+	/* Enable switch MII flow control. */
+	data = readw(hw->io + KS8842_SWITCH_CTRL_3_OFFSET);
+	data |= SWITCH_FLOW_CTRL;
+	writew(data, hw->io + KS8842_SWITCH_CTRL_3_OFFSET);
+
+	data = readw(hw->io + KS8842_SWITCH_CTRL_1_OFFSET);
+
+	/* Enable aggressive back off algorithm in half duplex mode. */
+	data |= SWITCH_AGGR_BACKOFF;
+
+	/* Enable automatic fast aging when link changed detected. */
+	data |= SWITCH_AGING_ENABLE;
+	data |= SWITCH_LINK_AUTO_AGING;
+
+	if (hw->overrides & FAST_AGING)
+		data |= SWITCH_FAST_AGING;
+	else
+		data &= ~SWITCH_FAST_AGING;
+	writew(data, hw->io + KS8842_SWITCH_CTRL_1_OFFSET);
+
+	data = readw(hw->io + KS8842_SWITCH_CTRL_2_OFFSET);
+
+	/* Enable no excessive collision drop. */
+	data |= NO_EXC_COLLISION_DROP;
+	writew(data, hw->io + KS8842_SWITCH_CTRL_2_OFFSET);
+}
+
+enum {
+	STP_STATE_DISABLED = 0,
+	STP_STATE_LISTENING,
+	STP_STATE_LEARNING,
+	STP_STATE_FORWARDING,
+	STP_STATE_BLOCKED,
+	STP_STATE_SIMPLE
+};
+
+/**
+ * port_set_stp_state - configure port spanning tree state
+ * @hw: 	The hardware instance.
+ * @port:	The port index.
+ * @state:	The spanning tree state.
+ *
+ * This routine configures the spanning tree state of the port.
+ */
+static void port_set_stp_state(struct ksz_hw *hw, int port, int state)
+{
+	u16 data;
+
+	port_r16(hw, port, KS8842_PORT_CTRL_2_OFFSET, &data);
+	switch (state) {
+	case STP_STATE_DISABLED:
+		data &= ~(PORT_TX_ENABLE | PORT_RX_ENABLE);
+		data |= PORT_LEARN_DISABLE;
+		break;
+	case STP_STATE_LISTENING:
+/*
+ * No need to turn on transmit because of port direct mode.
+ * Turning on receive is required if static MAC table is not setup.
+ */
+		data &= ~PORT_TX_ENABLE;
+		data |= PORT_RX_ENABLE;
+		data |= PORT_LEARN_DISABLE;
+		break;
+	case STP_STATE_LEARNING:
+		data &= ~PORT_TX_ENABLE;
+		data |= PORT_RX_ENABLE;
+		data &= ~PORT_LEARN_DISABLE;
+		break;
+	case STP_STATE_FORWARDING:
+		data |= (PORT_TX_ENABLE | PORT_RX_ENABLE);
+		data &= ~PORT_LEARN_DISABLE;
+		break;
+	case STP_STATE_BLOCKED:
+/*
+ * Need to setup static MAC table with override to keep receiving BPDU
+ * messages.  See sw_init_stp routine.
+ */
+		data &= ~(PORT_TX_ENABLE | PORT_RX_ENABLE);
+		data |= PORT_LEARN_DISABLE;
+		break;
+	case STP_STATE_SIMPLE:
+		data |= (PORT_TX_ENABLE | PORT_RX_ENABLE);
+		data |= PORT_LEARN_DISABLE;
+		break;
+	}
+	port_w16(hw, port, KS8842_PORT_CTRL_2_OFFSET, data);
+	hw->ksz_switch->port_cfg[port].stp_state = state;
+}
+
+#define STP_ENTRY			0
+#define BROADCAST_ENTRY			1
+#define BRIDGE_ADDR_ENTRY		2
+#define IPV6_ADDR_ENTRY			3
+
+/**
+ * sw_clr_sta_mac_table - clear static MAC table
+ * @hw: 	The hardware instance.
+ *
+ * This routine clears the static MAC table.
+ */
+static void sw_clr_sta_mac_table(struct ksz_hw *hw)
+{
+	struct ksz_mac_table *entry;
+	int i;
+
+	for (i = 0; i < STATIC_MAC_TABLE_ENTRIES; i++) {
+		entry = &hw->ksz_switch->mac_table[i];
+		sw_w_sta_mac_table(hw, i,
+			entry->mac_addr, entry->ports,
+			entry->override, 0,
+			entry->use_fid, entry->fid);
+	}
+}
+
+/**
+ * sw_init_stp - initialize switch spanning tree support
+ * @hw: 	The hardware instance.
+ *
+ * This routine initializes the spanning tree support of the switch.
+ */
+static void sw_init_stp(struct ksz_hw *hw)
+{
+	struct ksz_mac_table *entry;
+
+	entry = &hw->ksz_switch->mac_table[STP_ENTRY];
+	entry->mac_addr[0] = 0x01;
+	entry->mac_addr[1] = 0x80;
+	entry->mac_addr[2] = 0xC2;
+	entry->mac_addr[3] = 0x00;
+	entry->mac_addr[4] = 0x00;
+	entry->mac_addr[5] = 0x00;
+	entry->ports = HOST_MASK;
+	entry->override = 1;
+	entry->valid = 1;
+	sw_w_sta_mac_table(hw, STP_ENTRY,
+		entry->mac_addr, entry->ports,
+		entry->override, entry->valid,
+		entry->use_fid, entry->fid);
+}
+
+/**
+ * sw_block_addr - block certain packets from the host port
+ * @hw: 	The hardware instance.
+ *
+ * This routine blocks certain packets from reaching to the host port.
+ */
+static void sw_block_addr(struct ksz_hw *hw)
+{
+	struct ksz_mac_table *entry;
+	int i;
+
+	for (i = BROADCAST_ENTRY; i <= IPV6_ADDR_ENTRY; i++) {
+		entry = &hw->ksz_switch->mac_table[i];
+		entry->valid = 0;
+		sw_w_sta_mac_table(hw, i,
+			entry->mac_addr, entry->ports,
+			entry->override, entry->valid,
+			entry->use_fid, entry->fid);
+	}
+}
+
+#define PHY_LINK_SUPPORT		\
+	(PHY_AUTO_NEG_ASYM_PAUSE |	\
+	PHY_AUTO_NEG_SYM_PAUSE |	\
+	PHY_AUTO_NEG_100BT4 |		\
+	PHY_AUTO_NEG_100BTX_FD |	\
+	PHY_AUTO_NEG_100BTX |		\
+	PHY_AUTO_NEG_10BT_FD |		\
+	PHY_AUTO_NEG_10BT)
+
+static inline void hw_r_phy_ctrl(struct ksz_hw *hw, int phy, u16 *data)
+{
+	*data = readw(hw->io + phy + KS884X_PHY_CTRL_OFFSET);
+}
+
+static inline void hw_w_phy_ctrl(struct ksz_hw *hw, int phy, u16 data)
+{
+	writew(data, hw->io + phy + KS884X_PHY_CTRL_OFFSET);
+}
+
+static inline void hw_r_phy_link_stat(struct ksz_hw *hw, int phy, u16 *data)
+{
+	*data = readw(hw->io + phy + KS884X_PHY_STATUS_OFFSET);
+}
+
+static inline void hw_r_phy_auto_neg(struct ksz_hw *hw, int phy, u16 *data)
+{
+	*data = readw(hw->io + phy + KS884X_PHY_AUTO_NEG_OFFSET);
+}
+
+static inline void hw_w_phy_auto_neg(struct ksz_hw *hw, int phy, u16 data)
+{
+	writew(data, hw->io + phy + KS884X_PHY_AUTO_NEG_OFFSET);
+}
+
+static inline void hw_r_phy_rem_cap(struct ksz_hw *hw, int phy, u16 *data)
+{
+	*data = readw(hw->io + phy + KS884X_PHY_REMOTE_CAP_OFFSET);
+}
+
+static inline void hw_r_phy_crossover(struct ksz_hw *hw, int phy, u16 *data)
+{
+	*data = readw(hw->io + phy + KS884X_PHY_CTRL_OFFSET);
+}
+
+static inline void hw_w_phy_crossover(struct ksz_hw *hw, int phy, u16 data)
+{
+	writew(data, hw->io + phy + KS884X_PHY_CTRL_OFFSET);
+}
+
+static inline void hw_r_phy_polarity(struct ksz_hw *hw, int phy, u16 *data)
+{
+	*data = readw(hw->io + phy + KS884X_PHY_PHY_CTRL_OFFSET);
+}
+
+static inline void hw_w_phy_polarity(struct ksz_hw *hw, int phy, u16 data)
+{
+	writew(data, hw->io + phy + KS884X_PHY_PHY_CTRL_OFFSET);
+}
+
+static inline void hw_r_phy_link_md(struct ksz_hw *hw, int phy, u16 *data)
+{
+	*data = readw(hw->io + phy + KS884X_PHY_LINK_MD_OFFSET);
+}
+
+static inline void hw_w_phy_link_md(struct ksz_hw *hw, int phy, u16 data)
+{
+	writew(data, hw->io + phy + KS884X_PHY_LINK_MD_OFFSET);
+}
+
+/**
+ * hw_r_phy - read data from PHY register
+ * @hw: 	The hardware instance.
+ * @port:	Port to read.
+ * @reg:	PHY register to read.
+ * @val:	Buffer to store the read data.
+ *
+ * This routine reads data from the PHY register.
+ */
+static void hw_r_phy(struct ksz_hw *hw, int port, u16 reg, u16 *val)
+{
+	int phy;
+
+	phy = KS884X_PHY_1_CTRL_OFFSET + port * PHY_CTRL_INTERVAL + reg;
+	*val = readw(hw->io + phy);
+}
+
+/**
+ * port_w_phy - write data to PHY register
+ * @hw: 	The hardware instance.
+ * @port:	Port to write.
+ * @reg:	PHY register to write.
+ * @val:	Word data to write.
+ *
+ * This routine writes data to the PHY register.
+ */
+static void hw_w_phy(struct ksz_hw *hw, int port, u16 reg, u16 val)
+{
+	int phy;
+
+	phy = KS884X_PHY_1_CTRL_OFFSET + port * PHY_CTRL_INTERVAL + reg;
+	writew(val, hw->io + phy);
+}
+
+/*
+ * EEPROM access functions
+ */
+
+#define AT93C_CODE			0
+#define AT93C_WR_OFF			0x00
+#define AT93C_WR_ALL			0x10
+#define AT93C_ER_ALL			0x20
+#define AT93C_WR_ON			0x30
+
+#define AT93C_WRITE			1
+#define AT93C_READ			2
+#define AT93C_ERASE			3
+
+#define EEPROM_DELAY			4
+
+static inline void drop_gpio(struct ksz_hw *hw, u8 gpio)
+{
+	u16 data;
+
+	data = readw(hw->io + KS884X_EEPROM_CTRL_OFFSET);
+	data &= ~gpio;
+	writew(data, hw->io + KS884X_EEPROM_CTRL_OFFSET);
+}
+
+static inline void raise_gpio(struct ksz_hw *hw, u8 gpio)
+{
+	u16 data;
+
+	data = readw(hw->io + KS884X_EEPROM_CTRL_OFFSET);
+	data |= gpio;
+	writew(data, hw->io + KS884X_EEPROM_CTRL_OFFSET);
+}
+
+static inline u8 state_gpio(struct ksz_hw *hw, u8 gpio)
+{
+	u16 data;
+
+	data = readw(hw->io + KS884X_EEPROM_CTRL_OFFSET);
+	return (u8)(data & gpio);
+}
+
+static void eeprom_clk(struct ksz_hw *hw)
+{
+	raise_gpio(hw, EEPROM_SERIAL_CLOCK);
+	udelay(EEPROM_DELAY);
+	drop_gpio(hw, EEPROM_SERIAL_CLOCK);
+	udelay(EEPROM_DELAY);
+}
+
+static u16 spi_r(struct ksz_hw *hw)
+{
+	int i;
+	u16 temp = 0;
+
+	for (i = 15; i >= 0; i--) {
+		raise_gpio(hw, EEPROM_SERIAL_CLOCK);
+		udelay(EEPROM_DELAY);
+
+		temp |= (state_gpio(hw, EEPROM_DATA_IN)) ? 1 << i : 0;
+
+		drop_gpio(hw, EEPROM_SERIAL_CLOCK);
+		udelay(EEPROM_DELAY);
+	}
+	return temp;
+}
+
+static void spi_w(struct ksz_hw *hw, u16 data)
+{
+	int i;
+
+	for (i = 15; i >= 0; i--) {
+		(data & (0x01 << i)) ? raise_gpio(hw, EEPROM_DATA_OUT) :
+			drop_gpio(hw, EEPROM_DATA_OUT);
+		eeprom_clk(hw);
+	}
+}
+
+static void spi_reg(struct ksz_hw *hw, u8 data, u8 reg)
+{
+	int i;
+
+	/* Initial start bit */
+	raise_gpio(hw, EEPROM_DATA_OUT);
+	eeprom_clk(hw);
+
+	/* AT93C operation */
+	for (i = 1; i >= 0; i--) {
+		(data & (0x01 << i)) ? raise_gpio(hw, EEPROM_DATA_OUT) :
+			drop_gpio(hw, EEPROM_DATA_OUT);
+		eeprom_clk(hw);
+	}
+
+	/* Address location */
+	for (i = 5; i >= 0; i--) {
+		(reg & (0x01 << i)) ? raise_gpio(hw, EEPROM_DATA_OUT) :
+			drop_gpio(hw, EEPROM_DATA_OUT);
+		eeprom_clk(hw);
+	}
+}
+
+#define EEPROM_DATA_RESERVED		0
+#define EEPROM_DATA_MAC_ADDR_0		1
+#define EEPROM_DATA_MAC_ADDR_1		2
+#define EEPROM_DATA_MAC_ADDR_2		3
+#define EEPROM_DATA_SUBSYS_ID		4
+#define EEPROM_DATA_SUBSYS_VEN_ID	5
+#define EEPROM_DATA_PM_CAP		6
+
+/* User defined EEPROM data */
+#define EEPROM_DATA_OTHER_MAC_ADDR	9
+
+/**
+ * eeprom_read - read from AT93C46 EEPROM
+ * @hw: 	The hardware instance.
+ * @reg:	The register offset.
+ *
+ * This function reads a word from the AT93C46 EEPROM.
+ *
+ * Return the data value.
+ */
+static u16 eeprom_read(struct ksz_hw *hw, u8 reg)
+{
+	u16 data;
+
+	raise_gpio(hw, EEPROM_ACCESS_ENABLE | EEPROM_CHIP_SELECT);
+
+	spi_reg(hw, AT93C_READ, reg);
+	data = spi_r(hw);
+
+	drop_gpio(hw, EEPROM_ACCESS_ENABLE | EEPROM_CHIP_SELECT);
+
+	return data;
+}
+
+/**
+ * eeprom_write - write to AT93C46 EEPROM
+ * @hw: 	The hardware instance.
+ * @reg:	The register offset.
+ * @data:	The data value.
+ *
+ * This procedure writes a word to the AT93C46 EEPROM.
+ */
+static void eeprom_write(struct ksz_hw *hw, u8 reg, u16 data)
+{
+	int timeout;
+
+	raise_gpio(hw, EEPROM_ACCESS_ENABLE | EEPROM_CHIP_SELECT);
+
+	/* Enable write. */
+	spi_reg(hw, AT93C_CODE, AT93C_WR_ON);
+	drop_gpio(hw, EEPROM_CHIP_SELECT);
+	udelay(1);
+
+	/* Erase the register. */
+	raise_gpio(hw, EEPROM_CHIP_SELECT);
+	spi_reg(hw, AT93C_ERASE, reg);
+	drop_gpio(hw, EEPROM_CHIP_SELECT);
+	udelay(1);
+
+	/* Check operation complete. */
+	raise_gpio(hw, EEPROM_CHIP_SELECT);
+	timeout = 8;
+	mdelay(2);
+	do {
+		mdelay(1);
+	} while (!state_gpio(hw, EEPROM_DATA_IN) && --timeout);
+	drop_gpio(hw, EEPROM_CHIP_SELECT);
+	udelay(1);
+
+	/* Write the register. */
+	raise_gpio(hw, EEPROM_CHIP_SELECT);
+	spi_reg(hw, AT93C_WRITE, reg);
+	spi_w(hw, data);
+	drop_gpio(hw, EEPROM_CHIP_SELECT);
+	udelay(1);
+
+	/* Check operation complete. */
+	raise_gpio(hw, EEPROM_CHIP_SELECT);
+	timeout = 8;
+	mdelay(2);
+	do {
+		mdelay(1);
+	} while (!state_gpio(hw, EEPROM_DATA_IN) && --timeout);
+	drop_gpio(hw, EEPROM_CHIP_SELECT);
+	udelay(1);
+
+	/* Disable write. */
+	raise_gpio(hw, EEPROM_CHIP_SELECT);
+	spi_reg(hw, AT93C_CODE, AT93C_WR_OFF);
+
+	drop_gpio(hw, EEPROM_ACCESS_ENABLE | EEPROM_CHIP_SELECT);
+}
+
+/*
+ * Link detection routines
+ */
+
+static u16 advertised_flow_ctrl(struct ksz_port *port, u16 ctrl)
+{
+	ctrl &= ~PORT_AUTO_NEG_SYM_PAUSE;
+	switch (port->flow_ctrl) {
+	case PHY_FLOW_CTRL:
+		ctrl |= PORT_AUTO_NEG_SYM_PAUSE;
+		break;
+	/* Not supported. */
+	case PHY_TX_ONLY:
+	case PHY_RX_ONLY:
+	default:
+		break;
+	}
+	return ctrl;
+}
+
+static void set_flow_ctrl(struct ksz_hw *hw, int rx, int tx)
+{
+	u32 rx_cfg;
+	u32 tx_cfg;
+
+	rx_cfg = hw->rx_cfg;
+	tx_cfg = hw->tx_cfg;
+	if (rx)
+		hw->rx_cfg |= DMA_RX_FLOW_ENABLE;
+	else
+		hw->rx_cfg &= ~DMA_RX_FLOW_ENABLE;
+	if (tx)
+		hw->tx_cfg |= DMA_TX_FLOW_ENABLE;
+	else
+		hw->tx_cfg &= ~DMA_TX_FLOW_ENABLE;
+	if (hw->enabled) {
+		if (rx_cfg != hw->rx_cfg)
+			writel(hw->rx_cfg, hw->io + KS_DMA_RX_CTRL);
+		if (tx_cfg != hw->tx_cfg)
+			writel(hw->tx_cfg, hw->io + KS_DMA_TX_CTRL);
+	}
+}
+
+static void determine_flow_ctrl(struct ksz_hw *hw, struct ksz_port *port,
+	u16 local, u16 remote)
+{
+	int rx;
+	int tx;
+
+	if (hw->overrides & PAUSE_FLOW_CTRL)
+		return;
+
+	rx = tx = 0;
+	if (port->force_link)
+		rx = tx = 1;
+	if (remote & PHY_AUTO_NEG_SYM_PAUSE) {
+		if (local & PHY_AUTO_NEG_SYM_PAUSE) {
+			rx = tx = 1;
+		} else if ((remote & PHY_AUTO_NEG_ASYM_PAUSE) &&
+				(local & PHY_AUTO_NEG_PAUSE) ==
+				PHY_AUTO_NEG_ASYM_PAUSE) {
+			tx = 1;
+		}
+	} else if (remote & PHY_AUTO_NEG_ASYM_PAUSE) {
+		if ((local & PHY_AUTO_NEG_PAUSE) == PHY_AUTO_NEG_PAUSE)
+			rx = 1;
+	}
+	if (!hw->ksz_switch)
+		set_flow_ctrl(hw, rx, tx);
+}
+
+static inline void port_cfg_change(struct ksz_hw *hw, struct ksz_port *port,
+	struct ksz_port_info *info, u16 link_status)
+{
+	if ((hw->features & HALF_DUPLEX_SIGNAL_BUG) &&
+			!(hw->overrides & PAUSE_FLOW_CTRL)) {
+		u32 cfg = hw->tx_cfg;
+
+		/* Disable flow control in the half duplex mode. */
+		if (1 == info->duplex)
+			hw->tx_cfg &= ~DMA_TX_FLOW_ENABLE;
+		if (hw->enabled && cfg != hw->tx_cfg)
+			writel(hw->tx_cfg, hw->io + KS_DMA_TX_CTRL);
+	}
+}
+
+/**
+ * port_get_link_speed - get current link status
+ * @port: 	The port instance.
+ *
+ * This routine reads PHY registers to determine the current link status of the
+ * switch ports.
+ */
+static void port_get_link_speed(struct ksz_port *port)
+{
+	uint interrupt;
+	struct ksz_port_info *info;
+	struct ksz_port_info *linked = NULL;
+	struct ksz_hw *hw = port->hw;
+	u16 data;
+	u16 status;
+	u8 local;
+	u8 remote;
+	int i;
+	int p;
+	int change = 0;
+
+	interrupt = hw_block_intr(hw);
+
+	for (i = 0, p = port->first_port; i < port->port_cnt; i++, p++) {
+		info = &hw->port_info[p];
+		port_r16(hw, p, KS884X_PORT_CTRL_4_OFFSET, &data);
+		port_r16(hw, p, KS884X_PORT_STATUS_OFFSET, &status);
+
+		/*
+		 * Link status is changing all the time even when there is no
+		 * cable connection!
+		 */
+		remote = status & (PORT_AUTO_NEG_COMPLETE |
+			PORT_STATUS_LINK_GOOD);
+		local = (u8) data;
+
+		/* No change to status. */
+		if (local == info->advertised && remote == info->partner)
+			continue;
+
+		info->advertised = local;
+		info->partner = remote;
+		if (status & PORT_STATUS_LINK_GOOD) {
+
+			/* Remember the first linked port. */
+			if (!linked)
+				linked = info;
+
+			info->tx_rate = 10 * TX_RATE_UNIT;
+			if (status & PORT_STATUS_SPEED_100MBIT)
+				info->tx_rate = 100 * TX_RATE_UNIT;
+
+			info->duplex = 1;
+			if (status & PORT_STATUS_FULL_DUPLEX)
+				info->duplex = 2;
+
+			if (media_connected != info->state) {
+				hw_r_phy(hw, p, KS884X_PHY_AUTO_NEG_OFFSET,
+					&data);
+				hw_r_phy(hw, p, KS884X_PHY_REMOTE_CAP_OFFSET,
+					&status);
+				determine_flow_ctrl(hw, port, data, status);
+				if (hw->ksz_switch) {
+					port_cfg_back_pressure(hw, p,
+						(1 == info->duplex));
+				}
+				change |= 1 << i;
+				port_cfg_change(hw, port, info, status);
+			}
+			info->state = media_connected;
+		} else {
+			if (media_disconnected != info->state) {
+				change |= 1 << i;
+
+				/* Indicate the link just goes down. */
+				hw->port_mib[p].link_down = 1;
+			}
+			info->state = media_disconnected;
+		}
+		hw->port_mib[p].state = (u8) info->state;
+	}
+
+	if (linked && media_disconnected == port->linked->state)
+		port->linked = linked;
+
+	hw_restore_intr(hw, interrupt);
+}
+
+#define PHY_RESET_TIMEOUT		10
+
+/**
+ * port_set_link_speed - set port speed
+ * @port: 	The port instance.
+ *
+ * This routine sets the link speed of the switch ports.
+ */
+static void port_set_link_speed(struct ksz_port *port)
+{
+	struct ksz_hw *hw = port->hw;
+	u16 data;
+	u16 cfg;
+	u8 status;
+	int i;
+	int p;
+
+	for (i = 0, p = port->first_port; i < port->port_cnt; i++, p++) {
+		port_r16(hw, p, KS884X_PORT_CTRL_4_OFFSET, &data);
+		port_r8(hw, p, KS884X_PORT_STATUS_OFFSET, &status);
+
+		cfg = 0;
+		if (status & PORT_STATUS_LINK_GOOD)
+			cfg = data;
+
+		data |= PORT_AUTO_NEG_ENABLE;
+		data = advertised_flow_ctrl(port, data);
+
+		data |= PORT_AUTO_NEG_100BTX_FD | PORT_AUTO_NEG_100BTX |
+			PORT_AUTO_NEG_10BT_FD | PORT_AUTO_NEG_10BT;
+
+		/* Check if manual configuration is specified by the user. */
+		if (port->speed || port->duplex) {
+			if (10 == port->speed)
+				data &= ~(PORT_AUTO_NEG_100BTX_FD |
+					PORT_AUTO_NEG_100BTX);
+			else if (100 == port->speed)
+				data &= ~(PORT_AUTO_NEG_10BT_FD |
+					PORT_AUTO_NEG_10BT);
+			if (1 == port->duplex)
+				data &= ~(PORT_AUTO_NEG_100BTX_FD |
+					PORT_AUTO_NEG_10BT_FD);
+			else if (2 == port->duplex)
+				data &= ~(PORT_AUTO_NEG_100BTX |
+					PORT_AUTO_NEG_10BT);
+		}
+		if (data != cfg) {
+			data |= PORT_AUTO_NEG_RESTART;
+			port_w16(hw, p, KS884X_PORT_CTRL_4_OFFSET, data);
+		}
+	}
+}
+
+/**
+ * port_force_link_speed - force port speed
+ * @port: 	The port instance.
+ *
+ * This routine forces the link speed of the switch ports.
+ */
+static void port_force_link_speed(struct ksz_port *port)
+{
+	struct ksz_hw *hw = port->hw;
+	u16 data;
+	int i;
+	int phy;
+	int p;
+
+	for (i = 0, p = port->first_port; i < port->port_cnt; i++, p++) {
+		phy = KS884X_PHY_1_CTRL_OFFSET + p * PHY_CTRL_INTERVAL;
+		hw_r_phy_ctrl(hw, phy, &data);
+
+		data &= ~PHY_AUTO_NEG_ENABLE;
+
+		if (10 == port->speed)
+			data &= ~PHY_SPEED_100MBIT;
+		else if (100 == port->speed)
+			data |= PHY_SPEED_100MBIT;
+		if (1 == port->duplex)
+			data &= ~PHY_FULL_DUPLEX;
+		else if (2 == port->duplex)
+			data |= PHY_FULL_DUPLEX;
+		hw_w_phy_ctrl(hw, phy, data);
+	}
+}
+
+static void port_set_power_saving(struct ksz_port *port, int enable)
+{
+	struct ksz_hw *hw = port->hw;
+	int i;
+	int p;
+
+	for (i = 0, p = port->first_port; i < port->port_cnt; i++, p++)
+		port_cfg(hw, p,
+			KS884X_PORT_CTRL_4_OFFSET, PORT_POWER_DOWN, enable);
+}
+
+/*
+ * KSZ8841 power management functions
+ */
+
+/**
+ * hw_chk_wol_pme_status - check PMEN pin
+ * @hw: 	The hardware instance.
+ *
+ * This function is used to check PMEN pin is asserted.
+ *
+ * Return 1 if PMEN pin is asserted; otherwise, 0.
+ */
+static int hw_chk_wol_pme_status(struct ksz_hw *hw)
+{
+	struct dev_info *hw_priv = container_of(hw, struct dev_info, hw);
+	struct pci_dev *pdev = hw_priv->pdev;
+	u16 data;
+
+	if (!pdev->pm_cap)
+		return 0;
+	pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &data);
+	return (data & PCI_PM_CTRL_PME_STATUS) == PCI_PM_CTRL_PME_STATUS;
+}
+
+/**
+ * hw_clr_wol_pme_status - clear PMEN pin
+ * @hw: 	The hardware instance.
+ *
+ * This routine is used to clear PME_Status to deassert PMEN pin.
+ */
+static void hw_clr_wol_pme_status(struct ksz_hw *hw)
+{
+	struct dev_info *hw_priv = container_of(hw, struct dev_info, hw);
+	struct pci_dev *pdev = hw_priv->pdev;
+	u16 data;
+
+	if (!pdev->pm_cap)
+		return;
+
+	/* Clear PME_Status to deassert PMEN pin. */
+	pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &data);
+	data |= PCI_PM_CTRL_PME_STATUS;
+	pci_write_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, data);
+}
+
+/**
+ * hw_cfg_wol_pme - enable or disable Wake-on-LAN
+ * @hw: 	The hardware instance.
+ * @set:	The flag indicating whether to enable or disable.
+ *
+ * This routine is used to enable or disable Wake-on-LAN.
+ */
+static void hw_cfg_wol_pme(struct ksz_hw *hw, int set)
+{
+	struct dev_info *hw_priv = container_of(hw, struct dev_info, hw);
+	struct pci_dev *pdev = hw_priv->pdev;
+	u16 data;
+
+	if (!pdev->pm_cap)
+		return;
+	pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &data);
+	data &= ~PCI_PM_CTRL_STATE_MASK;
+	if (set)
+		data |= PCI_PM_CTRL_PME_ENABLE | PCI_D3hot;
+	else
+		data &= ~PCI_PM_CTRL_PME_ENABLE;
+	pci_write_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, data);
+}
+
+/**
+ * hw_cfg_wol - configure Wake-on-LAN features
+ * @hw: 	The hardware instance.
+ * @frame:	The pattern frame bit.
+ * @set:	The flag indicating whether to enable or disable.
+ *
+ * This routine is used to enable or disable certain Wake-on-LAN features.
+ */
+static void hw_cfg_wol(struct ksz_hw *hw, u16 frame, int set)
+{
+	u16 data;
+
+	data = readw(hw->io + KS8841_WOL_CTRL_OFFSET);
+	if (set)
+		data |= frame;
+	else
+		data &= ~frame;
+	writew(data, hw->io + KS8841_WOL_CTRL_OFFSET);
+}
+
+/**
+ * hw_set_wol_frame - program Wake-on-LAN pattern
+ * @hw: 	The hardware instance.
+ * @i:		The frame index.
+ * @mask_size:	The size of the mask.
+ * @mask:	Mask to ignore certain bytes in the pattern.
+ * @frame_size:	The size of the frame.
+ * @pattern:	The frame data.
+ *
+ * This routine is used to program Wake-on-LAN pattern.
+ */
+static void hw_set_wol_frame(struct ksz_hw *hw, int i, uint mask_size,
+	const u8 *mask, uint frame_size, const u8 *pattern)
+{
+	int bits;
+	int from;
+	int len;
+	int to;
+	u32 crc;
+	u8 data[64];
+	u8 val = 0;
+
+	if (frame_size > mask_size * 8)
+		frame_size = mask_size * 8;
+	if (frame_size > 64)
+		frame_size = 64;
+
+	i *= 0x10;
+	writel(0, hw->io + KS8841_WOL_FRAME_BYTE0_OFFSET + i);
+	writel(0, hw->io + KS8841_WOL_FRAME_BYTE2_OFFSET + i);
+
+	bits = len = from = to = 0;
+	do {
+		if (bits) {
+			if ((val & 1))
+				data[to++] = pattern[from];
+			val >>= 1;
+			++from;
+			--bits;
+		} else {
+			val = mask[len];
+			writeb(val, hw->io + KS8841_WOL_FRAME_BYTE0_OFFSET + i
+				+ len);
+			++len;
+			if (val)
+				bits = 8;
+			else
+				from += 8;
+		}
+	} while (from < (int) frame_size);
+	if (val) {
+		bits = mask[len - 1];
+		val <<= (from % 8);
+		bits &= ~val;
+		writeb(bits, hw->io + KS8841_WOL_FRAME_BYTE0_OFFSET + i + len -
+			1);
+	}
+	crc = ether_crc(to, data);
+	writel(crc, hw->io + KS8841_WOL_FRAME_CRC_OFFSET + i);
+}
+
+/**
+ * hw_add_wol_arp - add ARP pattern
+ * @hw: 	The hardware instance.
+ * @ip_addr:	The IPv4 address assigned to the device.
+ *
+ * This routine is used to add ARP pattern for waking up the host.
+ */
+static void hw_add_wol_arp(struct ksz_hw *hw, const u8 *ip_addr)
+{
+	static const u8 mask[6] = { 0x3F, 0xF0, 0x3F, 0x00, 0xC0, 0x03 };
+	u8 pattern[42] = {
+		0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x08, 0x06,
+		0x00, 0x01, 0x08, 0x00, 0x06, 0x04, 0x00, 0x01,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00 };
+
+	memcpy(&pattern[38], ip_addr, 4);
+	hw_set_wol_frame(hw, 3, 6, mask, 42, pattern);
+}
+
+/**
+ * hw_add_wol_bcast - add broadcast pattern
+ * @hw: 	The hardware instance.
+ *
+ * This routine is used to add broadcast pattern for waking up the host.
+ */
+static void hw_add_wol_bcast(struct ksz_hw *hw)
+{
+	static const u8 mask[] = { 0x3F };
+	static const u8 pattern[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
+
+	hw_set_wol_frame(hw, 2, 1, mask, ETH_ALEN, pattern);
+}
+
+/**
+ * hw_add_wol_mcast - add multicast pattern
+ * @hw: 	The hardware instance.
+ *
+ * This routine is used to add multicast pattern for waking up the host.
+ *
+ * It is assumed the multicast packet is the ICMPv6 neighbor solicitation used
+ * by IPv6 ping command.  Note that multicast packets are filtred through the
+ * multicast hash table, so not all multicast packets can wake up the host.
+ */
+static void hw_add_wol_mcast(struct ksz_hw *hw)
+{
+	static const u8 mask[] = { 0x3F };
+	u8 pattern[] = { 0x33, 0x33, 0xFF, 0x00, 0x00, 0x00 };
+
+	memcpy(&pattern[3], &hw->override_addr[3], 3);
+	hw_set_wol_frame(hw, 1, 1, mask, 6, pattern);
+}
+
+/**
+ * hw_add_wol_ucast - add unicast pattern
+ * @hw: 	The hardware instance.
+ *
+ * This routine is used to add unicast pattern to wakeup the host.
+ *
+ * It is assumed the unicast packet is directed to the device, as the hardware
+ * can only receive them in normal case.
+ */
+static void hw_add_wol_ucast(struct ksz_hw *hw)
+{
+	static const u8 mask[] = { 0x3F };
+
+	hw_set_wol_frame(hw, 0, 1, mask, ETH_ALEN, hw->override_addr);
+}
+
+/**
+ * hw_enable_wol - enable Wake-on-LAN
+ * @hw: 	The hardware instance.
+ * @wol_enable:	The Wake-on-LAN settings.
+ * @net_addr:	The IPv4 address assigned to the device.
+ *
+ * This routine is used to enable Wake-on-LAN depending on driver settings.
+ */
+static void hw_enable_wol(struct ksz_hw *hw, u32 wol_enable, const u8 *net_addr)
+{
+	hw_cfg_wol(hw, KS8841_WOL_MAGIC_ENABLE, (wol_enable & WAKE_MAGIC));
+	hw_cfg_wol(hw, KS8841_WOL_FRAME0_ENABLE, (wol_enable & WAKE_UCAST));
+	hw_add_wol_ucast(hw);
+	hw_cfg_wol(hw, KS8841_WOL_FRAME1_ENABLE, (wol_enable & WAKE_MCAST));
+	hw_add_wol_mcast(hw);
+	hw_cfg_wol(hw, KS8841_WOL_FRAME2_ENABLE, (wol_enable & WAKE_BCAST));
+	hw_cfg_wol(hw, KS8841_WOL_FRAME3_ENABLE, (wol_enable & WAKE_ARP));
+	hw_add_wol_arp(hw, net_addr);
+}
+
+/**
+ * hw_init - check driver is correct for the hardware
+ * @hw: 	The hardware instance.
+ *
+ * This function checks the hardware is correct for this driver and sets the
+ * hardware up for proper initialization.
+ *
+ * Return number of ports or 0 if not right.
+ */
+static int hw_init(struct ksz_hw *hw)
+{
+	int rc = 0;
+	u16 data;
+	u16 revision;
+
+	/* Set bus speed to 125MHz. */
+	writew(BUS_SPEED_125_MHZ, hw->io + KS884X_BUS_CTRL_OFFSET);
+
+	/* Check KSZ884x chip ID. */
+	data = readw(hw->io + KS884X_CHIP_ID_OFFSET);
+
+	revision = (data & KS884X_REVISION_MASK) >> KS884X_REVISION_SHIFT;
+	data &= KS884X_CHIP_ID_MASK_41;
+	if (REG_CHIP_ID_41 == data)
+		rc = 1;
+	else if (REG_CHIP_ID_42 == data)
+		rc = 2;
+	else
+		return 0;
+
+	/* Setup hardware features or bug workarounds. */
+	if (revision <= 1) {
+		hw->features |= SMALL_PACKET_TX_BUG;
+		if (1 == rc)
+			hw->features |= HALF_DUPLEX_SIGNAL_BUG;
+	}
+	return rc;
+}
+
+/**
+ * hw_reset - reset the hardware
+ * @hw: 	The hardware instance.
+ *
+ * This routine resets the hardware.
+ */
+static void hw_reset(struct ksz_hw *hw)
+{
+	writew(GLOBAL_SOFTWARE_RESET, hw->io + KS884X_GLOBAL_CTRL_OFFSET);
+
+	/* Wait for device to reset. */
+	mdelay(10);
+
+	/* Write 0 to clear device reset. */
+	writew(0, hw->io + KS884X_GLOBAL_CTRL_OFFSET);
+}
+
+/**
+ * hw_setup - setup the hardware
+ * @hw: 	The hardware instance.
+ *
+ * This routine setup the hardware for proper operation.
+ */
+static void hw_setup(struct ksz_hw *hw)
+{
+#if SET_DEFAULT_LED
+	u16 data;
+
+	/* Change default LED mode. */
+	data = readw(hw->io + KS8842_SWITCH_CTRL_5_OFFSET);
+	data &= ~LED_MODE;
+	data |= SET_DEFAULT_LED;
+	writew(data, hw->io + KS8842_SWITCH_CTRL_5_OFFSET);
+#endif
+
+	/* Setup transmit control. */
+	hw->tx_cfg = (DMA_TX_PAD_ENABLE | DMA_TX_CRC_ENABLE |
+		(DMA_BURST_DEFAULT << DMA_BURST_SHIFT) | DMA_TX_ENABLE);
+
+	/* Setup receive control. */
+	hw->rx_cfg = (DMA_RX_BROADCAST | DMA_RX_UNICAST |
+		(DMA_BURST_DEFAULT << DMA_BURST_SHIFT) | DMA_RX_ENABLE);
+	hw->rx_cfg |= KS884X_DMA_RX_MULTICAST;
+
+	/* Hardware cannot handle UDP packet in IP fragments. */
+	hw->rx_cfg |= (DMA_RX_CSUM_TCP | DMA_RX_CSUM_IP);
+
+	if (hw->all_multi)
+		hw->rx_cfg |= DMA_RX_ALL_MULTICAST;
+	if (hw->promiscuous)
+		hw->rx_cfg |= DMA_RX_PROMISCUOUS;
+}
+
+/**
+ * hw_setup_intr - setup interrupt mask
+ * @hw: 	The hardware instance.
+ *
+ * This routine setup the interrupt mask for proper operation.
+ */
+static void hw_setup_intr(struct ksz_hw *hw)
+{
+	hw->intr_mask = KS884X_INT_MASK | KS884X_INT_RX_OVERRUN;
+}
+
+static void ksz_check_desc_num(struct ksz_desc_info *info)
+{
+#define MIN_DESC_SHIFT  2
+
+	int alloc = info->alloc;
+	int shift;
+
+	shift = 0;
+	while (!(alloc & 1)) {
+		shift++;
+		alloc >>= 1;
+	}
+	if (alloc != 1 || shift < MIN_DESC_SHIFT) {
+		pr_alert("Hardware descriptor numbers not right!\n");
+		while (alloc) {
+			shift++;
+			alloc >>= 1;
+		}
+		if (shift < MIN_DESC_SHIFT)
+			shift = MIN_DESC_SHIFT;
+		alloc = 1 << shift;
+		info->alloc = alloc;
+	}
+	info->mask = info->alloc - 1;
+}
+
+static void hw_init_desc(struct ksz_desc_info *desc_info, int transmit)
+{
+	int i;
+	u32 phys = desc_info->ring_phys;
+	struct ksz_hw_desc *desc = desc_info->ring_virt;
+	struct ksz_desc *cur = desc_info->ring;
+	struct ksz_desc *previous = NULL;
+
+	for (i = 0; i < desc_info->alloc; i++) {
+		cur->phw = desc++;
+		phys += desc_info->size;
+		previous = cur++;
+		previous->phw->next = cpu_to_le32(phys);
+	}
+	previous->phw->next = cpu_to_le32(desc_info->ring_phys);
+	previous->sw.buf.rx.end_of_ring = 1;
+	previous->phw->buf.data = cpu_to_le32(previous->sw.buf.data);
+
+	desc_info->avail = desc_info->alloc;
+	desc_info->last = desc_info->next = 0;
+
+	desc_info->cur = desc_info->ring;
+}
+
+/**
+ * hw_set_desc_base - set descriptor base addresses
+ * @hw: 	The hardware instance.
+ * @tx_addr:	The transmit descriptor base.
+ * @rx_addr:	The receive descriptor base.
+ *
+ * This routine programs the descriptor base addresses after reset.
+ */
+static void hw_set_desc_base(struct ksz_hw *hw, u32 tx_addr, u32 rx_addr)
+{
+	/* Set base address of Tx/Rx descriptors. */
+	writel(tx_addr, hw->io + KS_DMA_TX_ADDR);
+	writel(rx_addr, hw->io + KS_DMA_RX_ADDR);
+}
+
+static void hw_reset_pkts(struct ksz_desc_info *info)
+{
+	info->cur = info->ring;
+	info->avail = info->alloc;
+	info->last = info->next = 0;
+}
+
+static inline void hw_resume_rx(struct ksz_hw *hw)
+{
+	writel(DMA_START, hw->io + KS_DMA_RX_START);
+}
+
+/**
+ * hw_start_rx - start receiving
+ * @hw: 	The hardware instance.
+ *
+ * This routine starts the receive function of the hardware.
+ */
+static void hw_start_rx(struct ksz_hw *hw)
+{
+	writel(hw->rx_cfg, hw->io + KS_DMA_RX_CTRL);
+
+	/* Notify when the receive stops. */
+	hw->intr_mask |= KS884X_INT_RX_STOPPED;
+
+	writel(DMA_START, hw->io + KS_DMA_RX_START);
+	hw_ack_intr(hw, KS884X_INT_RX_STOPPED);
+	hw->rx_stop++;
+
+	/* Variable overflows. */
+	if (0 == hw->rx_stop)
+		hw->rx_stop = 2;
+}
+
+/**
+ * hw_stop_rx - stop receiving
+ * @hw: 	The hardware instance.
+ *
+ * This routine stops the receive function of the hardware.
+ */
+static void hw_stop_rx(struct ksz_hw *hw)
+{
+	hw->rx_stop = 0;
+	hw_turn_off_intr(hw, KS884X_INT_RX_STOPPED);
+	writel((hw->rx_cfg & ~DMA_RX_ENABLE), hw->io + KS_DMA_RX_CTRL);
+}
+
+/**
+ * hw_start_tx - start transmitting
+ * @hw: 	The hardware instance.
+ *
+ * This routine starts the transmit function of the hardware.
+ */
+static void hw_start_tx(struct ksz_hw *hw)
+{
+	writel(hw->tx_cfg, hw->io + KS_DMA_TX_CTRL);
+}
+
+/**
+ * hw_stop_tx - stop transmitting
+ * @hw: 	The hardware instance.
+ *
+ * This routine stops the transmit function of the hardware.
+ */
+static void hw_stop_tx(struct ksz_hw *hw)
+{
+	writel((hw->tx_cfg & ~DMA_TX_ENABLE), hw->io + KS_DMA_TX_CTRL);
+}
+
+/**
+ * hw_disable - disable hardware
+ * @hw: 	The hardware instance.
+ *
+ * This routine disables the hardware.
+ */
+static void hw_disable(struct ksz_hw *hw)
+{
+	hw_stop_rx(hw);
+	hw_stop_tx(hw);
+	hw->enabled = 0;
+}
+
+/**
+ * hw_enable - enable hardware
+ * @hw: 	The hardware instance.
+ *
+ * This routine enables the hardware.
+ */
+static void hw_enable(struct ksz_hw *hw)
+{
+	hw_start_tx(hw);
+	hw_start_rx(hw);
+	hw->enabled = 1;
+}
+
+/**
+ * hw_alloc_pkt - allocate enough descriptors for transmission
+ * @hw: 	The hardware instance.
+ * @length:	The length of the packet.
+ * @physical:	Number of descriptors required.
+ *
+ * This function allocates descriptors for transmission.
+ *
+ * Return 0 if not successful; 1 for buffer copy; or number of descriptors.
+ */
+static int hw_alloc_pkt(struct ksz_hw *hw, int length, int physical)
+{
+	/* Always leave one descriptor free. */
+	if (hw->tx_desc_info.avail <= 1)
+		return 0;
+
+	/* Allocate a descriptor for transmission and mark it current. */
+	get_tx_pkt(&hw->tx_desc_info, &hw->tx_desc_info.cur);
+	hw->tx_desc_info.cur->sw.buf.tx.first_seg = 1;
+
+	/* Keep track of number of transmit descriptors used so far. */
+	++hw->tx_int_cnt;
+	hw->tx_size += length;
+
+	/* Cannot hold on too much data. */
+	if (hw->tx_size >= MAX_TX_HELD_SIZE)
+		hw->tx_int_cnt = hw->tx_int_mask + 1;
+
+	if (physical > hw->tx_desc_info.avail)
+		return 1;
+
+	return hw->tx_desc_info.avail;
+}
+
+/**
+ * hw_send_pkt - mark packet for transmission
+ * @hw: 	The hardware instance.
+ *
+ * This routine marks the packet for transmission in PCI version.
+ */
+static void hw_send_pkt(struct ksz_hw *hw)
+{
+	struct ksz_desc *cur = hw->tx_desc_info.cur;
+
+	cur->sw.buf.tx.last_seg = 1;
+
+	/* Interrupt only after specified number of descriptors used. */
+	if (hw->tx_int_cnt > hw->tx_int_mask) {
+		cur->sw.buf.tx.intr = 1;
+		hw->tx_int_cnt = 0;
+		hw->tx_size = 0;
+	}
+
+	/* KSZ8842 supports port directed transmission. */
+	cur->sw.buf.tx.dest_port = hw->dst_ports;
+
+	release_desc(cur);
+
+	writel(0, hw->io + KS_DMA_TX_START);
+}
+
+static int empty_addr(u8 *addr)
+{
+	u32 *addr1 = (u32 *) addr;
+	u16 *addr2 = (u16 *) &addr[4];
+
+	return 0 == *addr1 && 0 == *addr2;
+}
+
+/**
+ * hw_set_addr - set MAC address
+ * @hw: 	The hardware instance.
+ *
+ * This routine programs the MAC address of the hardware when the address is
+ * overridden.
+ */
+static void hw_set_addr(struct ksz_hw *hw)
+{
+	int i;
+
+	for (i = 0; i < ETH_ALEN; i++)
+		writeb(hw->override_addr[MAC_ADDR_ORDER(i)],
+			hw->io + KS884X_ADDR_0_OFFSET + i);
+
+	sw_set_addr(hw, hw->override_addr);
+}
+
+/**
+ * hw_read_addr - read MAC address
+ * @hw: 	The hardware instance.
+ *
+ * This routine retrieves the MAC address of the hardware.
+ */
+static void hw_read_addr(struct ksz_hw *hw)
+{
+	int i;
+
+	for (i = 0; i < ETH_ALEN; i++)
+		hw->perm_addr[MAC_ADDR_ORDER(i)] = readb(hw->io +
+			KS884X_ADDR_0_OFFSET + i);
+
+	if (!hw->mac_override) {
+		memcpy(hw->override_addr, hw->perm_addr, ETH_ALEN);
+		if (empty_addr(hw->override_addr)) {
+			memcpy(hw->perm_addr, DEFAULT_MAC_ADDRESS, ETH_ALEN);
+			memcpy(hw->override_addr, DEFAULT_MAC_ADDRESS,
+			       ETH_ALEN);
+			hw->override_addr[5] += hw->id;
+			hw_set_addr(hw);
+		}
+	}
+}
+
+static void hw_ena_add_addr(struct ksz_hw *hw, int index, u8 *mac_addr)
+{
+	int i;
+	u32 mac_addr_lo;
+	u32 mac_addr_hi;
+
+	mac_addr_hi = 0;
+	for (i = 0; i < 2; i++) {
+		mac_addr_hi <<= 8;
+		mac_addr_hi |= mac_addr[i];
+	}
+	mac_addr_hi |= ADD_ADDR_ENABLE;
+	mac_addr_lo = 0;
+	for (i = 2; i < 6; i++) {
+		mac_addr_lo <<= 8;
+		mac_addr_lo |= mac_addr[i];
+	}
+	index *= ADD_ADDR_INCR;
+
+	writel(mac_addr_lo, hw->io + index + KS_ADD_ADDR_0_LO);
+	writel(mac_addr_hi, hw->io + index + KS_ADD_ADDR_0_HI);
+}
+
+static void hw_set_add_addr(struct ksz_hw *hw)
+{
+	int i;
+
+	for (i = 0; i < ADDITIONAL_ENTRIES; i++) {
+		if (empty_addr(hw->address[i]))
+			writel(0, hw->io + ADD_ADDR_INCR * i +
+				KS_ADD_ADDR_0_HI);
+		else
+			hw_ena_add_addr(hw, i, hw->address[i]);
+	}
+}
+
+static int hw_add_addr(struct ksz_hw *hw, u8 *mac_addr)
+{
+	int i;
+	int j = ADDITIONAL_ENTRIES;
+
+	if (ether_addr_equal(hw->override_addr, mac_addr))
+		return 0;
+	for (i = 0; i < hw->addr_list_size; i++) {
+		if (ether_addr_equal(hw->address[i], mac_addr))
+			return 0;
+		if (ADDITIONAL_ENTRIES == j && empty_addr(hw->address[i]))
+			j = i;
+	}
+	if (j < ADDITIONAL_ENTRIES) {
+		memcpy(hw->address[j], mac_addr, ETH_ALEN);
+		hw_ena_add_addr(hw, j, hw->address[j]);
+		return 0;
+	}
+	return -1;
+}
+
+static int hw_del_addr(struct ksz_hw *hw, u8 *mac_addr)
+{
+	int i;
+
+	for (i = 0; i < hw->addr_list_size; i++) {
+		if (ether_addr_equal(hw->address[i], mac_addr)) {
+			eth_zero_addr(hw->address[i]);
+			writel(0, hw->io + ADD_ADDR_INCR * i +
+				KS_ADD_ADDR_0_HI);
+			return 0;
+		}
+	}
+	return -1;
+}
+
+/**
+ * hw_clr_multicast - clear multicast addresses
+ * @hw: 	The hardware instance.
+ *
+ * This routine removes all multicast addresses set in the hardware.
+ */
+static void hw_clr_multicast(struct ksz_hw *hw)
+{
+	int i;
+
+	for (i = 0; i < HW_MULTICAST_SIZE; i++) {
+		hw->multi_bits[i] = 0;
+
+		writeb(0, hw->io + KS884X_MULTICAST_0_OFFSET + i);
+	}
+}
+
+/**
+ * hw_set_grp_addr - set multicast addresses
+ * @hw: 	The hardware instance.
+ *
+ * This routine programs multicast addresses for the hardware to accept those
+ * addresses.
+ */
+static void hw_set_grp_addr(struct ksz_hw *hw)
+{
+	int i;
+	int index;
+	int position;
+	int value;
+
+	memset(hw->multi_bits, 0, sizeof(u8) * HW_MULTICAST_SIZE);
+
+	for (i = 0; i < hw->multi_list_size; i++) {
+		position = (ether_crc(6, hw->multi_list[i]) >> 26) & 0x3f;
+		index = position >> 3;
+		value = 1 << (position & 7);
+		hw->multi_bits[index] |= (u8) value;
+	}
+
+	for (i = 0; i < HW_MULTICAST_SIZE; i++)
+		writeb(hw->multi_bits[i], hw->io + KS884X_MULTICAST_0_OFFSET +
+			i);
+}
+
+/**
+ * hw_set_multicast - enable or disable all multicast receiving
+ * @hw: 	The hardware instance.
+ * @multicast:	To turn on or off the all multicast feature.
+ *
+ * This routine enables/disables the hardware to accept all multicast packets.
+ */
+static void hw_set_multicast(struct ksz_hw *hw, u8 multicast)
+{
+	/* Stop receiving for reconfiguration. */
+	hw_stop_rx(hw);
+
+	if (multicast)
+		hw->rx_cfg |= DMA_RX_ALL_MULTICAST;
+	else
+		hw->rx_cfg &= ~DMA_RX_ALL_MULTICAST;
+
+	if (hw->enabled)
+		hw_start_rx(hw);
+}
+
+/**
+ * hw_set_promiscuous - enable or disable promiscuous receiving
+ * @hw: 	The hardware instance.
+ * @prom:	To turn on or off the promiscuous feature.
+ *
+ * This routine enables/disables the hardware to accept all packets.
+ */
+static void hw_set_promiscuous(struct ksz_hw *hw, u8 prom)
+{
+	/* Stop receiving for reconfiguration. */
+	hw_stop_rx(hw);
+
+	if (prom)
+		hw->rx_cfg |= DMA_RX_PROMISCUOUS;
+	else
+		hw->rx_cfg &= ~DMA_RX_PROMISCUOUS;
+
+	if (hw->enabled)
+		hw_start_rx(hw);
+}
+
+/**
+ * sw_enable - enable the switch
+ * @hw: 	The hardware instance.
+ * @enable:	The flag to enable or disable the switch
+ *
+ * This routine is used to enable/disable the switch in KSZ8842.
+ */
+static void sw_enable(struct ksz_hw *hw, int enable)
+{
+	int port;
+
+	for (port = 0; port < SWITCH_PORT_NUM; port++) {
+		if (hw->dev_count > 1) {
+			/* Set port-base vlan membership with host port. */
+			sw_cfg_port_base_vlan(hw, port,
+				HOST_MASK | (1 << port));
+			port_set_stp_state(hw, port, STP_STATE_DISABLED);
+		} else {
+			sw_cfg_port_base_vlan(hw, port, PORT_MASK);
+			port_set_stp_state(hw, port, STP_STATE_FORWARDING);
+		}
+	}
+	if (hw->dev_count > 1)
+		port_set_stp_state(hw, SWITCH_PORT_NUM, STP_STATE_SIMPLE);
+	else
+		port_set_stp_state(hw, SWITCH_PORT_NUM, STP_STATE_FORWARDING);
+
+	if (enable)
+		enable = KS8842_START;
+	writew(enable, hw->io + KS884X_CHIP_ID_OFFSET);
+}
+
+/**
+ * sw_setup - setup the switch
+ * @hw: 	The hardware instance.
+ *
+ * This routine setup the hardware switch engine for default operation.
+ */
+static void sw_setup(struct ksz_hw *hw)
+{
+	int port;
+
+	sw_set_global_ctrl(hw);
+
+	/* Enable switch broadcast storm protection at 10% percent rate. */
+	sw_init_broad_storm(hw);
+	hw_cfg_broad_storm(hw, BROADCAST_STORM_PROTECTION_RATE);
+	for (port = 0; port < SWITCH_PORT_NUM; port++)
+		sw_ena_broad_storm(hw, port);
+
+	sw_init_prio(hw);
+
+	sw_init_mirror(hw);
+
+	sw_init_prio_rate(hw);
+
+	sw_init_vlan(hw);
+
+	if (hw->features & STP_SUPPORT)
+		sw_init_stp(hw);
+	if (!sw_chk(hw, KS8842_SWITCH_CTRL_1_OFFSET,
+			SWITCH_TX_FLOW_CTRL | SWITCH_RX_FLOW_CTRL))
+		hw->overrides |= PAUSE_FLOW_CTRL;
+	sw_enable(hw, 1);
+}
+
+/**
+ * ksz_start_timer - start kernel timer
+ * @info:	Kernel timer information.
+ * @time:	The time tick.
+ *
+ * This routine starts the kernel timer after the specified time tick.
+ */
+static void ksz_start_timer(struct ksz_timer_info *info, int time)
+{
+	info->cnt = 0;
+	info->timer.expires = jiffies + time;
+	add_timer(&info->timer);
+
+	/* infinity */
+	info->max = -1;
+}
+
+/**
+ * ksz_stop_timer - stop kernel timer
+ * @info:	Kernel timer information.
+ *
+ * This routine stops the kernel timer.
+ */
+static void ksz_stop_timer(struct ksz_timer_info *info)
+{
+	if (info->max) {
+		info->max = 0;
+		del_timer_sync(&info->timer);
+	}
+}
+
+static void ksz_init_timer(struct ksz_timer_info *info, int period,
+	void (*function)(struct timer_list *))
+{
+	info->max = 0;
+	info->period = period;
+	timer_setup(&info->timer, function, 0);
+}
+
+static void ksz_update_timer(struct ksz_timer_info *info)
+{
+	++info->cnt;
+	if (info->max > 0) {
+		if (info->cnt < info->max) {
+			info->timer.expires = jiffies + info->period;
+			add_timer(&info->timer);
+		} else
+			info->max = 0;
+	} else if (info->max < 0) {
+		info->timer.expires = jiffies + info->period;
+		add_timer(&info->timer);
+	}
+}
+
+/**
+ * ksz_alloc_soft_desc - allocate software descriptors
+ * @desc_info:	Descriptor information structure.
+ * @transmit:	Indication that descriptors are for transmit.
+ *
+ * This local function allocates software descriptors for manipulation in
+ * memory.
+ *
+ * Return 0 if successful.
+ */
+static int ksz_alloc_soft_desc(struct ksz_desc_info *desc_info, int transmit)
+{
+	desc_info->ring = kcalloc(desc_info->alloc, sizeof(struct ksz_desc),
+				  GFP_KERNEL);
+	if (!desc_info->ring)
+		return 1;
+	hw_init_desc(desc_info, transmit);
+	return 0;
+}
+
+/**
+ * ksz_alloc_desc - allocate hardware descriptors
+ * @adapter:	Adapter information structure.
+ *
+ * This local function allocates hardware descriptors for receiving and
+ * transmitting.
+ *
+ * Return 0 if successful.
+ */
+static int ksz_alloc_desc(struct dev_info *adapter)
+{
+	struct ksz_hw *hw = &adapter->hw;
+	int offset;
+
+	/* Allocate memory for RX & TX descriptors. */
+	adapter->desc_pool.alloc_size =
+		hw->rx_desc_info.size * hw->rx_desc_info.alloc +
+		hw->tx_desc_info.size * hw->tx_desc_info.alloc +
+		DESC_ALIGNMENT;
+
+	adapter->desc_pool.alloc_virt =
+		dma_alloc_coherent(&adapter->pdev->dev,
+				   adapter->desc_pool.alloc_size,
+				   &adapter->desc_pool.dma_addr, GFP_KERNEL);
+	if (adapter->desc_pool.alloc_virt == NULL) {
+		adapter->desc_pool.alloc_size = 0;
+		return 1;
+	}
+
+	/* Align to the next cache line boundary. */
+	offset = (((ulong) adapter->desc_pool.alloc_virt % DESC_ALIGNMENT) ?
+		(DESC_ALIGNMENT -
+		((ulong) adapter->desc_pool.alloc_virt % DESC_ALIGNMENT)) : 0);
+	adapter->desc_pool.virt = adapter->desc_pool.alloc_virt + offset;
+	adapter->desc_pool.phys = adapter->desc_pool.dma_addr + offset;
+
+	/* Allocate receive/transmit descriptors. */
+	hw->rx_desc_info.ring_virt = (struct ksz_hw_desc *)
+		adapter->desc_pool.virt;
+	hw->rx_desc_info.ring_phys = adapter->desc_pool.phys;
+	offset = hw->rx_desc_info.alloc * hw->rx_desc_info.size;
+	hw->tx_desc_info.ring_virt = (struct ksz_hw_desc *)
+		(adapter->desc_pool.virt + offset);
+	hw->tx_desc_info.ring_phys = adapter->desc_pool.phys + offset;
+
+	if (ksz_alloc_soft_desc(&hw->rx_desc_info, 0))
+		return 1;
+	if (ksz_alloc_soft_desc(&hw->tx_desc_info, 1))
+		return 1;
+
+	return 0;
+}
+
+/**
+ * free_dma_buf - release DMA buffer resources
+ * @adapter:	Adapter information structure.
+ * @dma_buf:	pointer to buf
+ * @direction:	to or from device
+ *
+ * This routine is just a helper function to release the DMA buffer resources.
+ */
+static void free_dma_buf(struct dev_info *adapter, struct ksz_dma_buf *dma_buf,
+	int direction)
+{
+	dma_unmap_single(&adapter->pdev->dev, dma_buf->dma, dma_buf->len,
+			 direction);
+	dev_kfree_skb(dma_buf->skb);
+	dma_buf->skb = NULL;
+	dma_buf->dma = 0;
+}
+
+/**
+ * ksz_init_rx_buffers - initialize receive descriptors
+ * @adapter:	Adapter information structure.
+ *
+ * This routine initializes DMA buffers for receiving.
+ */
+static void ksz_init_rx_buffers(struct dev_info *adapter)
+{
+	int i;
+	struct ksz_desc *desc;
+	struct ksz_dma_buf *dma_buf;
+	struct ksz_hw *hw = &adapter->hw;
+	struct ksz_desc_info *info = &hw->rx_desc_info;
+
+	for (i = 0; i < hw->rx_desc_info.alloc; i++) {
+		get_rx_pkt(info, &desc);
+
+		dma_buf = DMA_BUFFER(desc);
+		if (dma_buf->skb && dma_buf->len != adapter->mtu)
+			free_dma_buf(adapter, dma_buf, DMA_FROM_DEVICE);
+		dma_buf->len = adapter->mtu;
+		if (!dma_buf->skb)
+			dma_buf->skb = alloc_skb(dma_buf->len, GFP_ATOMIC);
+		if (dma_buf->skb && !dma_buf->dma)
+			dma_buf->dma = dma_map_single(&adapter->pdev->dev,
+						skb_tail_pointer(dma_buf->skb),
+						dma_buf->len,
+						DMA_FROM_DEVICE);
+
+		/* Set descriptor. */
+		set_rx_buf(desc, dma_buf->dma);
+		set_rx_len(desc, dma_buf->len);
+		release_desc(desc);
+	}
+}
+
+/**
+ * ksz_alloc_mem - allocate memory for hardware descriptors
+ * @adapter:	Adapter information structure.
+ *
+ * This function allocates memory for use by hardware descriptors for receiving
+ * and transmitting.
+ *
+ * Return 0 if successful.
+ */
+static int ksz_alloc_mem(struct dev_info *adapter)
+{
+	struct ksz_hw *hw = &adapter->hw;
+
+	/* Determine the number of receive and transmit descriptors. */
+	hw->rx_desc_info.alloc = NUM_OF_RX_DESC;
+	hw->tx_desc_info.alloc = NUM_OF_TX_DESC;
+
+	/* Determine how many descriptors to skip transmit interrupt. */
+	hw->tx_int_cnt = 0;
+	hw->tx_int_mask = NUM_OF_TX_DESC / 4;
+	if (hw->tx_int_mask > 8)
+		hw->tx_int_mask = 8;
+	while (hw->tx_int_mask) {
+		hw->tx_int_cnt++;
+		hw->tx_int_mask >>= 1;
+	}
+	if (hw->tx_int_cnt) {
+		hw->tx_int_mask = (1 << (hw->tx_int_cnt - 1)) - 1;
+		hw->tx_int_cnt = 0;
+	}
+
+	/* Determine the descriptor size. */
+	hw->rx_desc_info.size =
+		(((sizeof(struct ksz_hw_desc) + DESC_ALIGNMENT - 1) /
+		DESC_ALIGNMENT) * DESC_ALIGNMENT);
+	hw->tx_desc_info.size =
+		(((sizeof(struct ksz_hw_desc) + DESC_ALIGNMENT - 1) /
+		DESC_ALIGNMENT) * DESC_ALIGNMENT);
+	if (hw->rx_desc_info.size != sizeof(struct ksz_hw_desc))
+		pr_alert("Hardware descriptor size not right!\n");
+	ksz_check_desc_num(&hw->rx_desc_info);
+	ksz_check_desc_num(&hw->tx_desc_info);
+
+	/* Allocate descriptors. */
+	if (ksz_alloc_desc(adapter))
+		return 1;
+
+	return 0;
+}
+
+/**
+ * ksz_free_desc - free software and hardware descriptors
+ * @adapter:	Adapter information structure.
+ *
+ * This local routine frees the software and hardware descriptors allocated by
+ * ksz_alloc_desc().
+ */
+static void ksz_free_desc(struct dev_info *adapter)
+{
+	struct ksz_hw *hw = &adapter->hw;
+
+	/* Reset descriptor. */
+	hw->rx_desc_info.ring_virt = NULL;
+	hw->tx_desc_info.ring_virt = NULL;
+	hw->rx_desc_info.ring_phys = 0;
+	hw->tx_desc_info.ring_phys = 0;
+
+	/* Free memory. */
+	if (adapter->desc_pool.alloc_virt)
+		dma_free_coherent(&adapter->pdev->dev,
+				  adapter->desc_pool.alloc_size,
+				  adapter->desc_pool.alloc_virt,
+				  adapter->desc_pool.dma_addr);
+
+	/* Reset resource pool. */
+	adapter->desc_pool.alloc_size = 0;
+	adapter->desc_pool.alloc_virt = NULL;
+
+	kfree(hw->rx_desc_info.ring);
+	hw->rx_desc_info.ring = NULL;
+	kfree(hw->tx_desc_info.ring);
+	hw->tx_desc_info.ring = NULL;
+}
+
+/**
+ * ksz_free_buffers - free buffers used in the descriptors
+ * @adapter:	Adapter information structure.
+ * @desc_info:	Descriptor information structure.
+ * @direction:	to or from device
+ *
+ * This local routine frees buffers used in the DMA buffers.
+ */
+static void ksz_free_buffers(struct dev_info *adapter,
+	struct ksz_desc_info *desc_info, int direction)
+{
+	int i;
+	struct ksz_dma_buf *dma_buf;
+	struct ksz_desc *desc = desc_info->ring;
+
+	for (i = 0; i < desc_info->alloc; i++) {
+		dma_buf = DMA_BUFFER(desc);
+		if (dma_buf->skb)
+			free_dma_buf(adapter, dma_buf, direction);
+		desc++;
+	}
+}
+
+/**
+ * ksz_free_mem - free all resources used by descriptors
+ * @adapter:	Adapter information structure.
+ *
+ * This local routine frees all the resources allocated by ksz_alloc_mem().
+ */
+static void ksz_free_mem(struct dev_info *adapter)
+{
+	/* Free transmit buffers. */
+	ksz_free_buffers(adapter, &adapter->hw.tx_desc_info, DMA_TO_DEVICE);
+
+	/* Free receive buffers. */
+	ksz_free_buffers(adapter, &adapter->hw.rx_desc_info, DMA_FROM_DEVICE);
+
+	/* Free descriptors. */
+	ksz_free_desc(adapter);
+}
+
+static void get_mib_counters(struct ksz_hw *hw, int first, int cnt,
+	u64 *counter)
+{
+	int i;
+	int mib;
+	int port;
+	struct ksz_port_mib *port_mib;
+
+	memset(counter, 0, sizeof(u64) * TOTAL_PORT_COUNTER_NUM);
+	for (i = 0, port = first; i < cnt; i++, port++) {
+		port_mib = &hw->port_mib[port];
+		for (mib = port_mib->mib_start; mib < hw->mib_cnt; mib++)
+			counter[mib] += port_mib->counter[mib];
+	}
+}
+
+/**
+ * send_packet - send packet
+ * @skb:	Socket buffer.
+ * @dev:	Network device.
+ *
+ * This routine is used to send a packet out to the network.
+ */
+static void send_packet(struct sk_buff *skb, struct net_device *dev)
+{
+	struct ksz_desc *desc;
+	struct ksz_desc *first;
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_hw *hw = &hw_priv->hw;
+	struct ksz_desc_info *info = &hw->tx_desc_info;
+	struct ksz_dma_buf *dma_buf;
+	int len;
+	int last_frag = skb_shinfo(skb)->nr_frags;
+
+	/*
+	 * KSZ8842 with multiple device interfaces needs to be told which port
+	 * to send.
+	 */
+	if (hw->dev_count > 1)
+		hw->dst_ports = 1 << priv->port.first_port;
+
+	/* Hardware will pad the length to 60. */
+	len = skb->len;
+
+	/* Remember the very first descriptor. */
+	first = info->cur;
+	desc = first;
+
+	dma_buf = DMA_BUFFER(desc);
+	if (last_frag) {
+		int frag;
+		skb_frag_t *this_frag;
+
+		dma_buf->len = skb_headlen(skb);
+
+		dma_buf->dma = dma_map_single(&hw_priv->pdev->dev, skb->data,
+					      dma_buf->len, DMA_TO_DEVICE);
+		set_tx_buf(desc, dma_buf->dma);
+		set_tx_len(desc, dma_buf->len);
+
+		frag = 0;
+		do {
+			this_frag = &skb_shinfo(skb)->frags[frag];
+
+			/* Get a new descriptor. */
+			get_tx_pkt(info, &desc);
+
+			/* Keep track of descriptors used so far. */
+			++hw->tx_int_cnt;
+
+			dma_buf = DMA_BUFFER(desc);
+			dma_buf->len = skb_frag_size(this_frag);
+
+			dma_buf->dma = dma_map_single(&hw_priv->pdev->dev,
+						      skb_frag_address(this_frag),
+						      dma_buf->len,
+						      DMA_TO_DEVICE);
+			set_tx_buf(desc, dma_buf->dma);
+			set_tx_len(desc, dma_buf->len);
+
+			frag++;
+			if (frag == last_frag)
+				break;
+
+			/* Do not release the last descriptor here. */
+			release_desc(desc);
+		} while (1);
+
+		/* current points to the last descriptor. */
+		info->cur = desc;
+
+		/* Release the first descriptor. */
+		release_desc(first);
+	} else {
+		dma_buf->len = len;
+
+		dma_buf->dma = dma_map_single(&hw_priv->pdev->dev, skb->data,
+					      dma_buf->len, DMA_TO_DEVICE);
+		set_tx_buf(desc, dma_buf->dma);
+		set_tx_len(desc, dma_buf->len);
+	}
+
+	if (skb->ip_summed == CHECKSUM_PARTIAL) {
+		(desc)->sw.buf.tx.csum_gen_tcp = 1;
+		(desc)->sw.buf.tx.csum_gen_udp = 1;
+	}
+
+	/*
+	 * The last descriptor holds the packet so that it can be returned to
+	 * network subsystem after all descriptors are transmitted.
+	 */
+	dma_buf->skb = skb;
+
+	hw_send_pkt(hw);
+
+	/* Update transmit statistics. */
+	dev->stats.tx_packets++;
+	dev->stats.tx_bytes += len;
+}
+
+/**
+ * transmit_cleanup - clean up transmit descriptors
+ * @hw_priv:	Network device.
+ * @normal:	break if owned
+ *
+ * This routine is called to clean up the transmitted buffers.
+ */
+static void transmit_cleanup(struct dev_info *hw_priv, int normal)
+{
+	int last;
+	union desc_stat status;
+	struct ksz_hw *hw = &hw_priv->hw;
+	struct ksz_desc_info *info = &hw->tx_desc_info;
+	struct ksz_desc *desc;
+	struct ksz_dma_buf *dma_buf;
+	struct net_device *dev = NULL;
+
+	spin_lock_irq(&hw_priv->hwlock);
+	last = info->last;
+
+	while (info->avail < info->alloc) {
+		/* Get next descriptor which is not hardware owned. */
+		desc = &info->ring[last];
+		status.data = le32_to_cpu(desc->phw->ctrl.data);
+		if (status.tx.hw_owned) {
+			if (normal)
+				break;
+			else
+				reset_desc(desc, status);
+		}
+
+		dma_buf = DMA_BUFFER(desc);
+		dma_unmap_single(&hw_priv->pdev->dev, dma_buf->dma,
+				 dma_buf->len, DMA_TO_DEVICE);
+
+		/* This descriptor contains the last buffer in the packet. */
+		if (dma_buf->skb) {
+			dev = dma_buf->skb->dev;
+
+			/* Release the packet back to network subsystem. */
+			dev_kfree_skb_irq(dma_buf->skb);
+			dma_buf->skb = NULL;
+		}
+
+		/* Free the transmitted descriptor. */
+		last++;
+		last &= info->mask;
+		info->avail++;
+	}
+	info->last = last;
+	spin_unlock_irq(&hw_priv->hwlock);
+
+	/* Notify the network subsystem that the packet has been sent. */
+	if (dev)
+		netif_trans_update(dev);
+}
+
+/**
+ * transmit_done - transmit done processing
+ * @hw_priv:	Network device.
+ *
+ * This routine is called when the transmit interrupt is triggered, indicating
+ * either a packet is sent successfully or there are transmit errors.
+ */
+static void tx_done(struct dev_info *hw_priv)
+{
+	struct ksz_hw *hw = &hw_priv->hw;
+	int port;
+
+	transmit_cleanup(hw_priv, 1);
+
+	for (port = 0; port < hw->dev_count; port++) {
+		struct net_device *dev = hw->port_info[port].pdev;
+
+		if (netif_running(dev) && netif_queue_stopped(dev))
+			netif_wake_queue(dev);
+	}
+}
+
+static inline void copy_old_skb(struct sk_buff *old, struct sk_buff *skb)
+{
+	skb->dev = old->dev;
+	skb->protocol = old->protocol;
+	skb->ip_summed = old->ip_summed;
+	skb->csum = old->csum;
+	skb_set_network_header(skb, ETH_HLEN);
+
+	dev_consume_skb_any(old);
+}
+
+/**
+ * netdev_tx - send out packet
+ * @skb:	Socket buffer.
+ * @dev:	Network device.
+ *
+ * This function is used by the upper network layer to send out a packet.
+ *
+ * Return 0 if successful; otherwise an error code indicating failure.
+ */
+static netdev_tx_t netdev_tx(struct sk_buff *skb, struct net_device *dev)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_hw *hw = &hw_priv->hw;
+	int left;
+	int num = 1;
+	int rc = 0;
+
+	if (hw->features & SMALL_PACKET_TX_BUG) {
+		struct sk_buff *org_skb = skb;
+
+		if (skb->len <= 48) {
+			if (skb_end_pointer(skb) - skb->data >= 50) {
+				memset(&skb->data[skb->len], 0, 50 - skb->len);
+				skb->len = 50;
+			} else {
+				skb = netdev_alloc_skb(dev, 50);
+				if (!skb)
+					return NETDEV_TX_BUSY;
+				memcpy(skb->data, org_skb->data, org_skb->len);
+				memset(&skb->data[org_skb->len], 0,
+					50 - org_skb->len);
+				skb->len = 50;
+				copy_old_skb(org_skb, skb);
+			}
+		}
+	}
+
+	spin_lock_irq(&hw_priv->hwlock);
+
+	num = skb_shinfo(skb)->nr_frags + 1;
+	left = hw_alloc_pkt(hw, skb->len, num);
+	if (left) {
+		if (left < num ||
+		    (CHECKSUM_PARTIAL == skb->ip_summed &&
+		     skb->protocol == htons(ETH_P_IPV6))) {
+			struct sk_buff *org_skb = skb;
+
+			skb = netdev_alloc_skb(dev, org_skb->len);
+			if (!skb) {
+				rc = NETDEV_TX_BUSY;
+				goto unlock;
+			}
+			skb_copy_and_csum_dev(org_skb, skb->data);
+			org_skb->ip_summed = CHECKSUM_NONE;
+			skb->len = org_skb->len;
+			copy_old_skb(org_skb, skb);
+		}
+		send_packet(skb, dev);
+		if (left <= num)
+			netif_stop_queue(dev);
+	} else {
+		/* Stop the transmit queue until packet is allocated. */
+		netif_stop_queue(dev);
+		rc = NETDEV_TX_BUSY;
+	}
+unlock:
+	spin_unlock_irq(&hw_priv->hwlock);
+
+	return rc;
+}
+
+/**
+ * netdev_tx_timeout - transmit timeout processing
+ * @dev:	Network device.
+ * @txqueue:	index of hanging queue
+ *
+ * This routine is called when the transmit timer expires.  That indicates the
+ * hardware is not running correctly because transmit interrupts are not
+ * triggered to free up resources so that the transmit routine can continue
+ * sending out packets.  The hardware is reset to correct the problem.
+ */
+static void netdev_tx_timeout(struct net_device *dev, unsigned int txqueue)
+{
+	static unsigned long last_reset;
+
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_hw *hw = &hw_priv->hw;
+	int port;
+
+	if (hw->dev_count > 1) {
+		/*
+		 * Only reset the hardware if time between calls is long
+		 * enough.
+		 */
+		if (time_before_eq(jiffies, last_reset + dev->watchdog_timeo))
+			hw_priv = NULL;
+	}
+
+	last_reset = jiffies;
+	if (hw_priv) {
+		hw_dis_intr(hw);
+		hw_disable(hw);
+
+		transmit_cleanup(hw_priv, 0);
+		hw_reset_pkts(&hw->rx_desc_info);
+		hw_reset_pkts(&hw->tx_desc_info);
+		ksz_init_rx_buffers(hw_priv);
+
+		hw_reset(hw);
+
+		hw_set_desc_base(hw,
+			hw->tx_desc_info.ring_phys,
+			hw->rx_desc_info.ring_phys);
+		hw_set_addr(hw);
+		if (hw->all_multi)
+			hw_set_multicast(hw, hw->all_multi);
+		else if (hw->multi_list_size)
+			hw_set_grp_addr(hw);
+
+		if (hw->dev_count > 1) {
+			hw_set_add_addr(hw);
+			for (port = 0; port < SWITCH_PORT_NUM; port++) {
+				struct net_device *port_dev;
+
+				port_set_stp_state(hw, port,
+					STP_STATE_DISABLED);
+
+				port_dev = hw->port_info[port].pdev;
+				if (netif_running(port_dev))
+					port_set_stp_state(hw, port,
+						STP_STATE_SIMPLE);
+			}
+		}
+
+		hw_enable(hw);
+		hw_ena_intr(hw);
+	}
+
+	netif_trans_update(dev);
+	netif_wake_queue(dev);
+}
+
+static inline void csum_verified(struct sk_buff *skb)
+{
+	unsigned short protocol;
+	struct iphdr *iph;
+
+	protocol = skb->protocol;
+	skb_reset_network_header(skb);
+	iph = (struct iphdr *) skb_network_header(skb);
+	if (protocol == htons(ETH_P_8021Q)) {
+		protocol = iph->tot_len;
+		skb_set_network_header(skb, VLAN_HLEN);
+		iph = (struct iphdr *) skb_network_header(skb);
+	}
+	if (protocol == htons(ETH_P_IP)) {
+		if (iph->protocol == IPPROTO_TCP)
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+	}
+}
+
+static inline int rx_proc(struct net_device *dev, struct ksz_hw* hw,
+	struct ksz_desc *desc, union desc_stat status)
+{
+	int packet_len;
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_dma_buf *dma_buf;
+	struct sk_buff *skb;
+
+	/* Received length includes 4-byte CRC. */
+	packet_len = status.rx.frame_len - 4;
+
+	dma_buf = DMA_BUFFER(desc);
+	dma_sync_single_for_cpu(&hw_priv->pdev->dev, dma_buf->dma,
+				packet_len + 4, DMA_FROM_DEVICE);
+
+	do {
+		/* skb->data != skb->head */
+		skb = netdev_alloc_skb(dev, packet_len + 2);
+		if (!skb) {
+			dev->stats.rx_dropped++;
+			return -ENOMEM;
+		}
+
+		/*
+		 * Align socket buffer in 4-byte boundary for better
+		 * performance.
+		 */
+		skb_reserve(skb, 2);
+
+		skb_put_data(skb, dma_buf->skb->data, packet_len);
+	} while (0);
+
+	skb->protocol = eth_type_trans(skb, dev);
+
+	if (hw->rx_cfg & (DMA_RX_CSUM_UDP | DMA_RX_CSUM_TCP))
+		csum_verified(skb);
+
+	/* Update receive statistics. */
+	dev->stats.rx_packets++;
+	dev->stats.rx_bytes += packet_len;
+
+	/* Notify upper layer for received packet. */
+	netif_rx(skb);
+
+	return 0;
+}
+
+static int dev_rcv_packets(struct dev_info *hw_priv)
+{
+	int next;
+	union desc_stat status;
+	struct ksz_hw *hw = &hw_priv->hw;
+	struct net_device *dev = hw->port_info[0].pdev;
+	struct ksz_desc_info *info = &hw->rx_desc_info;
+	int left = info->alloc;
+	struct ksz_desc *desc;
+	int received = 0;
+
+	next = info->next;
+	while (left--) {
+		/* Get next descriptor which is not hardware owned. */
+		desc = &info->ring[next];
+		status.data = le32_to_cpu(desc->phw->ctrl.data);
+		if (status.rx.hw_owned)
+			break;
+
+		/* Status valid only when last descriptor bit is set. */
+		if (status.rx.last_desc && status.rx.first_desc) {
+			if (rx_proc(dev, hw, desc, status))
+				goto release_packet;
+			received++;
+		}
+
+release_packet:
+		release_desc(desc);
+		next++;
+		next &= info->mask;
+	}
+	info->next = next;
+
+	return received;
+}
+
+static int port_rcv_packets(struct dev_info *hw_priv)
+{
+	int next;
+	union desc_stat status;
+	struct ksz_hw *hw = &hw_priv->hw;
+	struct net_device *dev = hw->port_info[0].pdev;
+	struct ksz_desc_info *info = &hw->rx_desc_info;
+	int left = info->alloc;
+	struct ksz_desc *desc;
+	int received = 0;
+
+	next = info->next;
+	while (left--) {
+		/* Get next descriptor which is not hardware owned. */
+		desc = &info->ring[next];
+		status.data = le32_to_cpu(desc->phw->ctrl.data);
+		if (status.rx.hw_owned)
+			break;
+
+		if (hw->dev_count > 1) {
+			/* Get received port number. */
+			int p = HW_TO_DEV_PORT(status.rx.src_port);
+
+			dev = hw->port_info[p].pdev;
+			if (!netif_running(dev))
+				goto release_packet;
+		}
+
+		/* Status valid only when last descriptor bit is set. */
+		if (status.rx.last_desc && status.rx.first_desc) {
+			if (rx_proc(dev, hw, desc, status))
+				goto release_packet;
+			received++;
+		}
+
+release_packet:
+		release_desc(desc);
+		next++;
+		next &= info->mask;
+	}
+	info->next = next;
+
+	return received;
+}
+
+static int dev_rcv_special(struct dev_info *hw_priv)
+{
+	int next;
+	union desc_stat status;
+	struct ksz_hw *hw = &hw_priv->hw;
+	struct net_device *dev = hw->port_info[0].pdev;
+	struct ksz_desc_info *info = &hw->rx_desc_info;
+	int left = info->alloc;
+	struct ksz_desc *desc;
+	int received = 0;
+
+	next = info->next;
+	while (left--) {
+		/* Get next descriptor which is not hardware owned. */
+		desc = &info->ring[next];
+		status.data = le32_to_cpu(desc->phw->ctrl.data);
+		if (status.rx.hw_owned)
+			break;
+
+		if (hw->dev_count > 1) {
+			/* Get received port number. */
+			int p = HW_TO_DEV_PORT(status.rx.src_port);
+
+			dev = hw->port_info[p].pdev;
+			if (!netif_running(dev))
+				goto release_packet;
+		}
+
+		/* Status valid only when last descriptor bit is set. */
+		if (status.rx.last_desc && status.rx.first_desc) {
+			/*
+			 * Receive without error.  With receive errors
+			 * disabled, packets with receive errors will be
+			 * dropped, so no need to check the error bit.
+			 */
+			if (!status.rx.error || (status.data &
+					KS_DESC_RX_ERROR_COND) ==
+					KS_DESC_RX_ERROR_TOO_LONG) {
+				if (rx_proc(dev, hw, desc, status))
+					goto release_packet;
+				received++;
+			} else {
+				struct dev_priv *priv = netdev_priv(dev);
+
+				/* Update receive error statistics. */
+				priv->port.counter[OID_COUNTER_RCV_ERROR]++;
+			}
+		}
+
+release_packet:
+		release_desc(desc);
+		next++;
+		next &= info->mask;
+	}
+	info->next = next;
+
+	return received;
+}
+
+static void rx_proc_task(struct tasklet_struct *t)
+{
+	struct dev_info *hw_priv = from_tasklet(hw_priv, t, rx_tasklet);
+	struct ksz_hw *hw = &hw_priv->hw;
+
+	if (!hw->enabled)
+		return;
+	if (unlikely(!hw_priv->dev_rcv(hw_priv))) {
+
+		/* In case receive process is suspended because of overrun. */
+		hw_resume_rx(hw);
+
+		/* tasklets are interruptible. */
+		spin_lock_irq(&hw_priv->hwlock);
+		hw_turn_on_intr(hw, KS884X_INT_RX_MASK);
+		spin_unlock_irq(&hw_priv->hwlock);
+	} else {
+		hw_ack_intr(hw, KS884X_INT_RX);
+		tasklet_schedule(&hw_priv->rx_tasklet);
+	}
+}
+
+static void tx_proc_task(struct tasklet_struct *t)
+{
+	struct dev_info *hw_priv = from_tasklet(hw_priv, t, tx_tasklet);
+	struct ksz_hw *hw = &hw_priv->hw;
+
+	hw_ack_intr(hw, KS884X_INT_TX_MASK);
+
+	tx_done(hw_priv);
+
+	/* tasklets are interruptible. */
+	spin_lock_irq(&hw_priv->hwlock);
+	hw_turn_on_intr(hw, KS884X_INT_TX);
+	spin_unlock_irq(&hw_priv->hwlock);
+}
+
+static inline void handle_rx_stop(struct ksz_hw *hw)
+{
+	/* Receive just has been stopped. */
+	if (0 == hw->rx_stop)
+		hw->intr_mask &= ~KS884X_INT_RX_STOPPED;
+	else if (hw->rx_stop > 1) {
+		if (hw->enabled && (hw->rx_cfg & DMA_RX_ENABLE)) {
+			hw_start_rx(hw);
+		} else {
+			hw->intr_mask &= ~KS884X_INT_RX_STOPPED;
+			hw->rx_stop = 0;
+		}
+	} else
+		/* Receive just has been started. */
+		hw->rx_stop++;
+}
+
+/**
+ * netdev_intr - interrupt handling
+ * @irq:	Interrupt number.
+ * @dev_id:	Network device.
+ *
+ * This function is called by upper network layer to signal interrupt.
+ *
+ * Return IRQ_HANDLED if interrupt is handled.
+ */
+static irqreturn_t netdev_intr(int irq, void *dev_id)
+{
+	uint int_enable = 0;
+	struct net_device *dev = (struct net_device *) dev_id;
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_hw *hw = &hw_priv->hw;
+
+	spin_lock(&hw_priv->hwlock);
+
+	hw_read_intr(hw, &int_enable);
+
+	/* Not our interrupt! */
+	if (!int_enable) {
+		spin_unlock(&hw_priv->hwlock);
+		return IRQ_NONE;
+	}
+
+	do {
+		hw_ack_intr(hw, int_enable);
+		int_enable &= hw->intr_mask;
+
+		if (unlikely(int_enable & KS884X_INT_TX_MASK)) {
+			hw_dis_intr_bit(hw, KS884X_INT_TX_MASK);
+			tasklet_schedule(&hw_priv->tx_tasklet);
+		}
+
+		if (likely(int_enable & KS884X_INT_RX)) {
+			hw_dis_intr_bit(hw, KS884X_INT_RX);
+			tasklet_schedule(&hw_priv->rx_tasklet);
+		}
+
+		if (unlikely(int_enable & KS884X_INT_RX_OVERRUN)) {
+			dev->stats.rx_fifo_errors++;
+			hw_resume_rx(hw);
+		}
+
+		if (unlikely(int_enable & KS884X_INT_PHY)) {
+			struct ksz_port *port = &priv->port;
+
+			hw->features |= LINK_INT_WORKING;
+			port_get_link_speed(port);
+		}
+
+		if (unlikely(int_enable & KS884X_INT_RX_STOPPED)) {
+			handle_rx_stop(hw);
+			break;
+		}
+
+		if (unlikely(int_enable & KS884X_INT_TX_STOPPED)) {
+			u32 data;
+
+			hw->intr_mask &= ~KS884X_INT_TX_STOPPED;
+			pr_info("Tx stopped\n");
+			data = readl(hw->io + KS_DMA_TX_CTRL);
+			if (!(data & DMA_TX_ENABLE))
+				pr_info("Tx disabled\n");
+			break;
+		}
+	} while (0);
+
+	hw_ena_intr(hw);
+
+	spin_unlock(&hw_priv->hwlock);
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * Linux network device functions
+ */
+
+static unsigned long next_jiffies;
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void netdev_netpoll(struct net_device *dev)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+
+	hw_dis_intr(&hw_priv->hw);
+	netdev_intr(dev->irq, dev);
+}
+#endif
+
+static void bridge_change(struct ksz_hw *hw)
+{
+	int port;
+	u8  member;
+	struct ksz_switch *sw = hw->ksz_switch;
+
+	/* No ports in forwarding state. */
+	if (!sw->member) {
+		port_set_stp_state(hw, SWITCH_PORT_NUM, STP_STATE_SIMPLE);
+		sw_block_addr(hw);
+	}
+	for (port = 0; port < SWITCH_PORT_NUM; port++) {
+		if (STP_STATE_FORWARDING == sw->port_cfg[port].stp_state)
+			member = HOST_MASK | sw->member;
+		else
+			member = HOST_MASK | (1 << port);
+		if (member != sw->port_cfg[port].member)
+			sw_cfg_port_base_vlan(hw, port, member);
+	}
+}
+
+/**
+ * netdev_close - close network device
+ * @dev:	Network device.
+ *
+ * This function process the close operation of network device.  This is caused
+ * by the user command "ifconfig ethX down."
+ *
+ * Return 0 if successful; otherwise an error code indicating failure.
+ */
+static int netdev_close(struct net_device *dev)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_port *port = &priv->port;
+	struct ksz_hw *hw = &hw_priv->hw;
+	int pi;
+
+	netif_stop_queue(dev);
+
+	ksz_stop_timer(&priv->monitor_timer_info);
+
+	/* Need to shut the port manually in multiple device interfaces mode. */
+	if (hw->dev_count > 1) {
+		port_set_stp_state(hw, port->first_port, STP_STATE_DISABLED);
+
+		/* Port is closed.  Need to change bridge setting. */
+		if (hw->features & STP_SUPPORT) {
+			pi = 1 << port->first_port;
+			if (hw->ksz_switch->member & pi) {
+				hw->ksz_switch->member &= ~pi;
+				bridge_change(hw);
+			}
+		}
+	}
+	if (port->first_port > 0)
+		hw_del_addr(hw, dev->dev_addr);
+	if (!hw_priv->wol_enable)
+		port_set_power_saving(port, true);
+
+	if (priv->multicast)
+		--hw->all_multi;
+	if (priv->promiscuous)
+		--hw->promiscuous;
+
+	hw_priv->opened--;
+	if (!(hw_priv->opened)) {
+		ksz_stop_timer(&hw_priv->mib_timer_info);
+		flush_work(&hw_priv->mib_read);
+
+		hw_dis_intr(hw);
+		hw_disable(hw);
+		hw_clr_multicast(hw);
+
+		/* Delay for receive task to stop scheduling itself. */
+		msleep(2000 / HZ);
+
+		tasklet_kill(&hw_priv->rx_tasklet);
+		tasklet_kill(&hw_priv->tx_tasklet);
+		free_irq(dev->irq, hw_priv->dev);
+
+		transmit_cleanup(hw_priv, 0);
+		hw_reset_pkts(&hw->rx_desc_info);
+		hw_reset_pkts(&hw->tx_desc_info);
+
+		/* Clean out static MAC table when the switch is shutdown. */
+		if (hw->features & STP_SUPPORT)
+			sw_clr_sta_mac_table(hw);
+	}
+
+	return 0;
+}
+
+static void hw_cfg_huge_frame(struct dev_info *hw_priv, struct ksz_hw *hw)
+{
+	if (hw->ksz_switch) {
+		u32 data;
+
+		data = readw(hw->io + KS8842_SWITCH_CTRL_2_OFFSET);
+		if (hw->features & RX_HUGE_FRAME)
+			data |= SWITCH_HUGE_PACKET;
+		else
+			data &= ~SWITCH_HUGE_PACKET;
+		writew(data, hw->io + KS8842_SWITCH_CTRL_2_OFFSET);
+	}
+	if (hw->features & RX_HUGE_FRAME) {
+		hw->rx_cfg |= DMA_RX_ERROR;
+		hw_priv->dev_rcv = dev_rcv_special;
+	} else {
+		hw->rx_cfg &= ~DMA_RX_ERROR;
+		if (hw->dev_count > 1)
+			hw_priv->dev_rcv = port_rcv_packets;
+		else
+			hw_priv->dev_rcv = dev_rcv_packets;
+	}
+}
+
+static int prepare_hardware(struct net_device *dev)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_hw *hw = &hw_priv->hw;
+	int rc = 0;
+
+	/* Remember the network device that requests interrupts. */
+	hw_priv->dev = dev;
+	rc = request_irq(dev->irq, netdev_intr, IRQF_SHARED, dev->name, dev);
+	if (rc)
+		return rc;
+	tasklet_setup(&hw_priv->rx_tasklet, rx_proc_task);
+	tasklet_setup(&hw_priv->tx_tasklet, tx_proc_task);
+
+	hw->promiscuous = 0;
+	hw->all_multi = 0;
+	hw->multi_list_size = 0;
+
+	hw_reset(hw);
+
+	hw_set_desc_base(hw,
+		hw->tx_desc_info.ring_phys, hw->rx_desc_info.ring_phys);
+	hw_set_addr(hw);
+	hw_cfg_huge_frame(hw_priv, hw);
+	ksz_init_rx_buffers(hw_priv);
+	return 0;
+}
+
+static void set_media_state(struct net_device *dev, int media_state)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+
+	if (media_state == priv->media_state)
+		netif_carrier_on(dev);
+	else
+		netif_carrier_off(dev);
+	netif_info(priv, link, dev, "link %s\n",
+		   media_state == priv->media_state ? "on" : "off");
+}
+
+/**
+ * netdev_open - open network device
+ * @dev:	Network device.
+ *
+ * This function process the open operation of network device.  This is caused
+ * by the user command "ifconfig ethX up."
+ *
+ * Return 0 if successful; otherwise an error code indicating failure.
+ */
+static int netdev_open(struct net_device *dev)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_hw *hw = &hw_priv->hw;
+	struct ksz_port *port = &priv->port;
+	int i;
+	int p;
+	int rc = 0;
+
+	priv->multicast = 0;
+	priv->promiscuous = 0;
+
+	/* Reset device statistics. */
+	memset(&dev->stats, 0, sizeof(struct net_device_stats));
+	memset((void *) port->counter, 0,
+		(sizeof(u64) * OID_COUNTER_LAST));
+
+	if (!(hw_priv->opened)) {
+		rc = prepare_hardware(dev);
+		if (rc)
+			return rc;
+		for (i = 0; i < hw->mib_port_cnt; i++) {
+			if (next_jiffies < jiffies)
+				next_jiffies = jiffies + HZ * 2;
+			else
+				next_jiffies += HZ * 1;
+			hw_priv->counter[i].time = next_jiffies;
+			hw->port_mib[i].state = media_disconnected;
+			port_init_cnt(hw, i);
+		}
+		if (hw->ksz_switch)
+			hw->port_mib[HOST_PORT].state = media_connected;
+		else {
+			hw_add_wol_bcast(hw);
+			hw_cfg_wol_pme(hw, 0);
+			hw_clr_wol_pme_status(&hw_priv->hw);
+		}
+	}
+	port_set_power_saving(port, false);
+
+	for (i = 0, p = port->first_port; i < port->port_cnt; i++, p++) {
+		/*
+		 * Initialize to invalid value so that link detection
+		 * is done.
+		 */
+		hw->port_info[p].partner = 0xFF;
+		hw->port_info[p].state = media_disconnected;
+	}
+
+	/* Need to open the port in multiple device interfaces mode. */
+	if (hw->dev_count > 1) {
+		port_set_stp_state(hw, port->first_port, STP_STATE_SIMPLE);
+		if (port->first_port > 0)
+			hw_add_addr(hw, dev->dev_addr);
+	}
+
+	port_get_link_speed(port);
+	if (port->force_link)
+		port_force_link_speed(port);
+	else
+		port_set_link_speed(port);
+
+	if (!(hw_priv->opened)) {
+		hw_setup_intr(hw);
+		hw_enable(hw);
+		hw_ena_intr(hw);
+
+		if (hw->mib_port_cnt)
+			ksz_start_timer(&hw_priv->mib_timer_info,
+				hw_priv->mib_timer_info.period);
+	}
+
+	hw_priv->opened++;
+
+	ksz_start_timer(&priv->monitor_timer_info,
+		priv->monitor_timer_info.period);
+
+	priv->media_state = port->linked->state;
+
+	set_media_state(dev, media_connected);
+	netif_start_queue(dev);
+
+	return 0;
+}
+
+/* RX errors = rx_errors */
+/* RX dropped = rx_dropped */
+/* RX overruns = rx_fifo_errors */
+/* RX frame = rx_crc_errors + rx_frame_errors + rx_length_errors */
+/* TX errors = tx_errors */
+/* TX dropped = tx_dropped */
+/* TX overruns = tx_fifo_errors */
+/* TX carrier = tx_aborted_errors + tx_carrier_errors + tx_window_errors */
+/* collisions = collisions */
+
+/**
+ * netdev_query_statistics - query network device statistics
+ * @dev:	Network device.
+ *
+ * This function returns the statistics of the network device.  The device
+ * needs not be opened.
+ *
+ * Return network device statistics.
+ */
+static struct net_device_stats *netdev_query_statistics(struct net_device *dev)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct ksz_port *port = &priv->port;
+	struct ksz_hw *hw = &priv->adapter->hw;
+	struct ksz_port_mib *mib;
+	int i;
+	int p;
+
+	dev->stats.rx_errors = port->counter[OID_COUNTER_RCV_ERROR];
+	dev->stats.tx_errors = port->counter[OID_COUNTER_XMIT_ERROR];
+
+	/* Reset to zero to add count later. */
+	dev->stats.multicast = 0;
+	dev->stats.collisions = 0;
+	dev->stats.rx_length_errors = 0;
+	dev->stats.rx_crc_errors = 0;
+	dev->stats.rx_frame_errors = 0;
+	dev->stats.tx_window_errors = 0;
+
+	for (i = 0, p = port->first_port; i < port->mib_port_cnt; i++, p++) {
+		mib = &hw->port_mib[p];
+
+		dev->stats.multicast += (unsigned long)
+			mib->counter[MIB_COUNTER_RX_MULTICAST];
+
+		dev->stats.collisions += (unsigned long)
+			mib->counter[MIB_COUNTER_TX_TOTAL_COLLISION];
+
+		dev->stats.rx_length_errors += (unsigned long)(
+			mib->counter[MIB_COUNTER_RX_UNDERSIZE] +
+			mib->counter[MIB_COUNTER_RX_FRAGMENT] +
+			mib->counter[MIB_COUNTER_RX_OVERSIZE] +
+			mib->counter[MIB_COUNTER_RX_JABBER]);
+		dev->stats.rx_crc_errors += (unsigned long)
+			mib->counter[MIB_COUNTER_RX_CRC_ERR];
+		dev->stats.rx_frame_errors += (unsigned long)(
+			mib->counter[MIB_COUNTER_RX_ALIGNMENT_ERR] +
+			mib->counter[MIB_COUNTER_RX_SYMBOL_ERR]);
+
+		dev->stats.tx_window_errors += (unsigned long)
+			mib->counter[MIB_COUNTER_TX_LATE_COLLISION];
+	}
+
+	return &dev->stats;
+}
+
+/**
+ * netdev_set_mac_address - set network device MAC address
+ * @dev:	Network device.
+ * @addr:	Buffer of MAC address.
+ *
+ * This function is used to set the MAC address of the network device.
+ *
+ * Return 0 to indicate success.
+ */
+static int netdev_set_mac_address(struct net_device *dev, void *addr)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_hw *hw = &hw_priv->hw;
+	struct sockaddr *mac = addr;
+	uint interrupt;
+
+	if (priv->port.first_port > 0)
+		hw_del_addr(hw, dev->dev_addr);
+	else {
+		hw->mac_override = 1;
+		memcpy(hw->override_addr, mac->sa_data, ETH_ALEN);
+	}
+
+	memcpy(dev->dev_addr, mac->sa_data, ETH_ALEN);
+
+	interrupt = hw_block_intr(hw);
+
+	if (priv->port.first_port > 0)
+		hw_add_addr(hw, dev->dev_addr);
+	else
+		hw_set_addr(hw);
+	hw_restore_intr(hw, interrupt);
+
+	return 0;
+}
+
+static void dev_set_promiscuous(struct net_device *dev, struct dev_priv *priv,
+	struct ksz_hw *hw, int promiscuous)
+{
+	if (promiscuous != priv->promiscuous) {
+		u8 prev_state = hw->promiscuous;
+
+		if (promiscuous)
+			++hw->promiscuous;
+		else
+			--hw->promiscuous;
+		priv->promiscuous = promiscuous;
+
+		/* Turn on/off promiscuous mode. */
+		if (hw->promiscuous <= 1 && prev_state <= 1)
+			hw_set_promiscuous(hw, hw->promiscuous);
+
+		/*
+		 * Port is not in promiscuous mode, meaning it is released
+		 * from the bridge.
+		 */
+		if ((hw->features & STP_SUPPORT) && !promiscuous &&
+		    netif_is_bridge_port(dev)) {
+			struct ksz_switch *sw = hw->ksz_switch;
+			int port = priv->port.first_port;
+
+			port_set_stp_state(hw, port, STP_STATE_DISABLED);
+			port = 1 << port;
+			if (sw->member & port) {
+				sw->member &= ~port;
+				bridge_change(hw);
+			}
+		}
+	}
+}
+
+static void dev_set_multicast(struct dev_priv *priv, struct ksz_hw *hw,
+	int multicast)
+{
+	if (multicast != priv->multicast) {
+		u8 all_multi = hw->all_multi;
+
+		if (multicast)
+			++hw->all_multi;
+		else
+			--hw->all_multi;
+		priv->multicast = multicast;
+
+		/* Turn on/off all multicast mode. */
+		if (hw->all_multi <= 1 && all_multi <= 1)
+			hw_set_multicast(hw, hw->all_multi);
+	}
+}
+
+/**
+ * netdev_set_rx_mode
+ * @dev:	Network device.
+ *
+ * This routine is used to set multicast addresses or put the network device
+ * into promiscuous mode.
+ */
+static void netdev_set_rx_mode(struct net_device *dev)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_hw *hw = &hw_priv->hw;
+	struct netdev_hw_addr *ha;
+	int multicast = (dev->flags & IFF_ALLMULTI);
+
+	dev_set_promiscuous(dev, priv, hw, (dev->flags & IFF_PROMISC));
+
+	if (hw_priv->hw.dev_count > 1)
+		multicast |= (dev->flags & IFF_MULTICAST);
+	dev_set_multicast(priv, hw, multicast);
+
+	/* Cannot use different hashes in multiple device interfaces mode. */
+	if (hw_priv->hw.dev_count > 1)
+		return;
+
+	if ((dev->flags & IFF_MULTICAST) && !netdev_mc_empty(dev)) {
+		int i = 0;
+
+		/* List too big to support so turn on all multicast mode. */
+		if (netdev_mc_count(dev) > MAX_MULTICAST_LIST) {
+			if (MAX_MULTICAST_LIST != hw->multi_list_size) {
+				hw->multi_list_size = MAX_MULTICAST_LIST;
+				++hw->all_multi;
+				hw_set_multicast(hw, hw->all_multi);
+			}
+			return;
+		}
+
+		netdev_for_each_mc_addr(ha, dev) {
+			if (i >= MAX_MULTICAST_LIST)
+				break;
+			memcpy(hw->multi_list[i++], ha->addr, ETH_ALEN);
+		}
+		hw->multi_list_size = (u8) i;
+		hw_set_grp_addr(hw);
+	} else {
+		if (MAX_MULTICAST_LIST == hw->multi_list_size) {
+			--hw->all_multi;
+			hw_set_multicast(hw, hw->all_multi);
+		}
+		hw->multi_list_size = 0;
+		hw_clr_multicast(hw);
+	}
+}
+
+static int netdev_change_mtu(struct net_device *dev, int new_mtu)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_hw *hw = &hw_priv->hw;
+	int hw_mtu;
+
+	if (netif_running(dev))
+		return -EBUSY;
+
+	/* Cannot use different MTU in multiple device interfaces mode. */
+	if (hw->dev_count > 1)
+		if (dev != hw_priv->dev)
+			return 0;
+
+	hw_mtu = new_mtu + ETHERNET_HEADER_SIZE + 4;
+	if (hw_mtu > REGULAR_RX_BUF_SIZE) {
+		hw->features |= RX_HUGE_FRAME;
+		hw_mtu = MAX_RX_BUF_SIZE;
+	} else {
+		hw->features &= ~RX_HUGE_FRAME;
+		hw_mtu = REGULAR_RX_BUF_SIZE;
+	}
+	hw_mtu = (hw_mtu + 3) & ~3;
+	hw_priv->mtu = hw_mtu;
+	dev->mtu = new_mtu;
+
+	return 0;
+}
+
+/**
+ * netdev_ioctl - I/O control processing
+ * @dev:	Network device.
+ * @ifr:	Interface request structure.
+ * @cmd:	I/O control code.
+ *
+ * This function is used to process I/O control calls.
+ *
+ * Return 0 to indicate success.
+ */
+static int netdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_hw *hw = &hw_priv->hw;
+	struct ksz_port *port = &priv->port;
+	int result = 0;
+	struct mii_ioctl_data *data = if_mii(ifr);
+
+	if (down_interruptible(&priv->proc_sem))
+		return -ERESTARTSYS;
+
+	switch (cmd) {
+	/* Get address of MII PHY in use. */
+	case SIOCGMIIPHY:
+		data->phy_id = priv->id;
+		fallthrough;
+
+	/* Read MII PHY register. */
+	case SIOCGMIIREG:
+		if (data->phy_id != priv->id || data->reg_num >= 6)
+			result = -EIO;
+		else
+			hw_r_phy(hw, port->linked->port_id, data->reg_num,
+				&data->val_out);
+		break;
+
+	/* Write MII PHY register. */
+	case SIOCSMIIREG:
+		if (!capable(CAP_NET_ADMIN))
+			result = -EPERM;
+		else if (data->phy_id != priv->id || data->reg_num >= 6)
+			result = -EIO;
+		else
+			hw_w_phy(hw, port->linked->port_id, data->reg_num,
+				data->val_in);
+		break;
+
+	default:
+		result = -EOPNOTSUPP;
+	}
+
+	up(&priv->proc_sem);
+
+	return result;
+}
+
+/*
+ * MII support
+ */
+
+/**
+ * mdio_read - read PHY register
+ * @dev:	Network device.
+ * @phy_id:	The PHY id.
+ * @reg_num:	The register number.
+ *
+ * This function returns the PHY register value.
+ *
+ * Return the register value.
+ */
+static int mdio_read(struct net_device *dev, int phy_id, int reg_num)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct ksz_port *port = &priv->port;
+	struct ksz_hw *hw = port->hw;
+	u16 val_out;
+
+	hw_r_phy(hw, port->linked->port_id, reg_num << 1, &val_out);
+	return val_out;
+}
+
+/**
+ * mdio_write - set PHY register
+ * @dev:	Network device.
+ * @phy_id:	The PHY id.
+ * @reg_num:	The register number.
+ * @val:	The register value.
+ *
+ * This procedure sets the PHY register value.
+ */
+static void mdio_write(struct net_device *dev, int phy_id, int reg_num, int val)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct ksz_port *port = &priv->port;
+	struct ksz_hw *hw = port->hw;
+	int i;
+	int pi;
+
+	for (i = 0, pi = port->first_port; i < port->port_cnt; i++, pi++)
+		hw_w_phy(hw, pi, reg_num << 1, val);
+}
+
+/*
+ * ethtool support
+ */
+
+#define EEPROM_SIZE			0x40
+
+static u16 eeprom_data[EEPROM_SIZE] = { 0 };
+
+#define ADVERTISED_ALL			\
+	(ADVERTISED_10baseT_Half |	\
+	ADVERTISED_10baseT_Full |	\
+	ADVERTISED_100baseT_Half |	\
+	ADVERTISED_100baseT_Full)
+
+/* These functions use the MII functions in mii.c. */
+
+/**
+ * netdev_get_link_ksettings - get network device settings
+ * @dev:	Network device.
+ * @cmd:	Ethtool command.
+ *
+ * This function queries the PHY and returns its state in the ethtool command.
+ *
+ * Return 0 if successful; otherwise an error code.
+ */
+static int netdev_get_link_ksettings(struct net_device *dev,
+				     struct ethtool_link_ksettings *cmd)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+
+	mutex_lock(&hw_priv->lock);
+	mii_ethtool_get_link_ksettings(&priv->mii_if, cmd);
+	ethtool_link_ksettings_add_link_mode(cmd, advertising, TP);
+	mutex_unlock(&hw_priv->lock);
+
+	/* Save advertised settings for workaround in next function. */
+	ethtool_convert_link_mode_to_legacy_u32(&priv->advertising,
+						cmd->link_modes.advertising);
+
+	return 0;
+}
+
+/**
+ * netdev_set_link_ksettings - set network device settings
+ * @dev:	Network device.
+ * @cmd:	Ethtool command.
+ *
+ * This function sets the PHY according to the ethtool command.
+ *
+ * Return 0 if successful; otherwise an error code.
+ */
+static int netdev_set_link_ksettings(struct net_device *dev,
+				     const struct ethtool_link_ksettings *cmd)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_port *port = &priv->port;
+	struct ethtool_link_ksettings copy_cmd;
+	u32 speed = cmd->base.speed;
+	u32 advertising;
+	int rc;
+
+	ethtool_convert_link_mode_to_legacy_u32(&advertising,
+						cmd->link_modes.advertising);
+
+	/*
+	 * ethtool utility does not change advertised setting if auto
+	 * negotiation is not specified explicitly.
+	 */
+	if (cmd->base.autoneg && priv->advertising == advertising) {
+		advertising |= ADVERTISED_ALL;
+		if (10 == speed)
+			advertising &=
+				~(ADVERTISED_100baseT_Full |
+				ADVERTISED_100baseT_Half);
+		else if (100 == speed)
+			advertising &=
+				~(ADVERTISED_10baseT_Full |
+				ADVERTISED_10baseT_Half);
+		if (0 == cmd->base.duplex)
+			advertising &=
+				~(ADVERTISED_100baseT_Full |
+				ADVERTISED_10baseT_Full);
+		else if (1 == cmd->base.duplex)
+			advertising &=
+				~(ADVERTISED_100baseT_Half |
+				ADVERTISED_10baseT_Half);
+	}
+	mutex_lock(&hw_priv->lock);
+	if (cmd->base.autoneg &&
+	    (advertising & ADVERTISED_ALL) == ADVERTISED_ALL) {
+		port->duplex = 0;
+		port->speed = 0;
+		port->force_link = 0;
+	} else {
+		port->duplex = cmd->base.duplex + 1;
+		if (1000 != speed)
+			port->speed = speed;
+		if (cmd->base.autoneg)
+			port->force_link = 0;
+		else
+			port->force_link = 1;
+	}
+
+	memcpy(&copy_cmd, cmd, sizeof(copy_cmd));
+	ethtool_convert_legacy_u32_to_link_mode(copy_cmd.link_modes.advertising,
+						advertising);
+	rc = mii_ethtool_set_link_ksettings(
+		&priv->mii_if,
+		(const struct ethtool_link_ksettings *)&copy_cmd);
+	mutex_unlock(&hw_priv->lock);
+	return rc;
+}
+
+/**
+ * netdev_nway_reset - restart auto-negotiation
+ * @dev:	Network device.
+ *
+ * This function restarts the PHY for auto-negotiation.
+ *
+ * Return 0 if successful; otherwise an error code.
+ */
+static int netdev_nway_reset(struct net_device *dev)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	int rc;
+
+	mutex_lock(&hw_priv->lock);
+	rc = mii_nway_restart(&priv->mii_if);
+	mutex_unlock(&hw_priv->lock);
+	return rc;
+}
+
+/**
+ * netdev_get_link - get network device link status
+ * @dev:	Network device.
+ *
+ * This function gets the link status from the PHY.
+ *
+ * Return true if PHY is linked and false otherwise.
+ */
+static u32 netdev_get_link(struct net_device *dev)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	int rc;
+
+	rc = mii_link_ok(&priv->mii_if);
+	return rc;
+}
+
+/**
+ * netdev_get_drvinfo - get network driver information
+ * @dev:	Network device.
+ * @info:	Ethtool driver info data structure.
+ *
+ * This procedure returns the driver information.
+ */
+static void netdev_get_drvinfo(struct net_device *dev,
+	struct ethtool_drvinfo *info)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+
+	strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
+	strlcpy(info->version, DRV_VERSION, sizeof(info->version));
+	strlcpy(info->bus_info, pci_name(hw_priv->pdev),
+		sizeof(info->bus_info));
+}
+
+static struct hw_regs {
+	int start;
+	int end;
+} hw_regs_range[] = {
+	{ KS_DMA_TX_CTRL,	KS884X_INTERRUPTS_STATUS },
+	{ KS_ADD_ADDR_0_LO,	KS_ADD_ADDR_F_HI },
+	{ KS884X_ADDR_0_OFFSET,	KS8841_WOL_FRAME_BYTE2_OFFSET },
+	{ KS884X_SIDER_P,	KS8842_SGCR7_P },
+	{ KS8842_MACAR1_P,	KS8842_TOSR8_P },
+	{ KS884X_P1MBCR_P,	KS8842_P3ERCR_P },
+	{ 0, 0 }
+};
+
+/**
+ * netdev_get_regs_len - get length of register dump
+ * @dev:	Network device.
+ *
+ * This function returns the length of the register dump.
+ *
+ * Return length of the register dump.
+ */
+static int netdev_get_regs_len(struct net_device *dev)
+{
+	struct hw_regs *range = hw_regs_range;
+	int regs_len = 0x10 * sizeof(u32);
+
+	while (range->end > range->start) {
+		regs_len += (range->end - range->start + 3) / 4 * 4;
+		range++;
+	}
+	return regs_len;
+}
+
+/**
+ * netdev_get_regs - get register dump
+ * @dev:	Network device.
+ * @regs:	Ethtool registers data structure.
+ * @ptr:	Buffer to store the register values.
+ *
+ * This procedure dumps the register values in the provided buffer.
+ */
+static void netdev_get_regs(struct net_device *dev, struct ethtool_regs *regs,
+	void *ptr)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_hw *hw = &hw_priv->hw;
+	int *buf = (int *) ptr;
+	struct hw_regs *range = hw_regs_range;
+	int len;
+
+	mutex_lock(&hw_priv->lock);
+	regs->version = 0;
+	for (len = 0; len < 0x40; len += 4) {
+		pci_read_config_dword(hw_priv->pdev, len, buf);
+		buf++;
+	}
+	while (range->end > range->start) {
+		for (len = range->start; len < range->end; len += 4) {
+			*buf = readl(hw->io + len);
+			buf++;
+		}
+		range++;
+	}
+	mutex_unlock(&hw_priv->lock);
+}
+
+#define WOL_SUPPORT			\
+	(WAKE_PHY | WAKE_MAGIC |	\
+	WAKE_UCAST | WAKE_MCAST |	\
+	WAKE_BCAST | WAKE_ARP)
+
+/**
+ * netdev_get_wol - get Wake-on-LAN support
+ * @dev:	Network device.
+ * @wol:	Ethtool Wake-on-LAN data structure.
+ *
+ * This procedure returns Wake-on-LAN support.
+ */
+static void netdev_get_wol(struct net_device *dev,
+	struct ethtool_wolinfo *wol)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+
+	wol->supported = hw_priv->wol_support;
+	wol->wolopts = hw_priv->wol_enable;
+	memset(&wol->sopass, 0, sizeof(wol->sopass));
+}
+
+/**
+ * netdev_set_wol - set Wake-on-LAN support
+ * @dev:	Network device.
+ * @wol:	Ethtool Wake-on-LAN data structure.
+ *
+ * This function sets Wake-on-LAN support.
+ *
+ * Return 0 if successful; otherwise an error code.
+ */
+static int netdev_set_wol(struct net_device *dev,
+	struct ethtool_wolinfo *wol)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+
+	/* Need to find a way to retrieve the device IP address. */
+	static const u8 net_addr[] = { 192, 168, 1, 1 };
+
+	if (wol->wolopts & ~hw_priv->wol_support)
+		return -EINVAL;
+
+	hw_priv->wol_enable = wol->wolopts;
+
+	/* Link wakeup cannot really be disabled. */
+	if (wol->wolopts)
+		hw_priv->wol_enable |= WAKE_PHY;
+	hw_enable_wol(&hw_priv->hw, hw_priv->wol_enable, net_addr);
+	return 0;
+}
+
+/**
+ * netdev_get_msglevel - get debug message level
+ * @dev:	Network device.
+ *
+ * This function returns current debug message level.
+ *
+ * Return current debug message flags.
+ */
+static u32 netdev_get_msglevel(struct net_device *dev)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+
+	return priv->msg_enable;
+}
+
+/**
+ * netdev_set_msglevel - set debug message level
+ * @dev:	Network device.
+ * @value:	Debug message flags.
+ *
+ * This procedure sets debug message level.
+ */
+static void netdev_set_msglevel(struct net_device *dev, u32 value)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+
+	priv->msg_enable = value;
+}
+
+/**
+ * netdev_get_eeprom_len - get EEPROM length
+ * @dev:	Network device.
+ *
+ * This function returns the length of the EEPROM.
+ *
+ * Return length of the EEPROM.
+ */
+static int netdev_get_eeprom_len(struct net_device *dev)
+{
+	return EEPROM_SIZE * 2;
+}
+
+#define EEPROM_MAGIC			0x10A18842
+
+/**
+ * netdev_get_eeprom - get EEPROM data
+ * @dev:	Network device.
+ * @eeprom:	Ethtool EEPROM data structure.
+ * @data:	Buffer to store the EEPROM data.
+ *
+ * This function dumps the EEPROM data in the provided buffer.
+ *
+ * Return 0 if successful; otherwise an error code.
+ */
+static int netdev_get_eeprom(struct net_device *dev,
+	struct ethtool_eeprom *eeprom, u8 *data)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	u8 *eeprom_byte = (u8 *) eeprom_data;
+	int i;
+	int len;
+
+	len = (eeprom->offset + eeprom->len + 1) / 2;
+	for (i = eeprom->offset / 2; i < len; i++)
+		eeprom_data[i] = eeprom_read(&hw_priv->hw, i);
+	eeprom->magic = EEPROM_MAGIC;
+	memcpy(data, &eeprom_byte[eeprom->offset], eeprom->len);
+
+	return 0;
+}
+
+/**
+ * netdev_set_eeprom - write EEPROM data
+ * @dev:	Network device.
+ * @eeprom:	Ethtool EEPROM data structure.
+ * @data:	Data buffer.
+ *
+ * This function modifies the EEPROM data one byte at a time.
+ *
+ * Return 0 if successful; otherwise an error code.
+ */
+static int netdev_set_eeprom(struct net_device *dev,
+	struct ethtool_eeprom *eeprom, u8 *data)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	u16 eeprom_word[EEPROM_SIZE];
+	u8 *eeprom_byte = (u8 *) eeprom_word;
+	int i;
+	int len;
+
+	if (eeprom->magic != EEPROM_MAGIC)
+		return -EINVAL;
+
+	len = (eeprom->offset + eeprom->len + 1) / 2;
+	for (i = eeprom->offset / 2; i < len; i++)
+		eeprom_data[i] = eeprom_read(&hw_priv->hw, i);
+	memcpy(eeprom_word, eeprom_data, EEPROM_SIZE * 2);
+	memcpy(&eeprom_byte[eeprom->offset], data, eeprom->len);
+	for (i = 0; i < EEPROM_SIZE; i++)
+		if (eeprom_word[i] != eeprom_data[i]) {
+			eeprom_data[i] = eeprom_word[i];
+			eeprom_write(&hw_priv->hw, i, eeprom_data[i]);
+	}
+
+	return 0;
+}
+
+/**
+ * netdev_get_pauseparam - get flow control parameters
+ * @dev:	Network device.
+ * @pause:	Ethtool PAUSE settings data structure.
+ *
+ * This procedure returns the PAUSE control flow settings.
+ */
+static void netdev_get_pauseparam(struct net_device *dev,
+	struct ethtool_pauseparam *pause)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_hw *hw = &hw_priv->hw;
+
+	pause->autoneg = (hw->overrides & PAUSE_FLOW_CTRL) ? 0 : 1;
+	if (!hw->ksz_switch) {
+		pause->rx_pause =
+			(hw->rx_cfg & DMA_RX_FLOW_ENABLE) ? 1 : 0;
+		pause->tx_pause =
+			(hw->tx_cfg & DMA_TX_FLOW_ENABLE) ? 1 : 0;
+	} else {
+		pause->rx_pause =
+			(sw_chk(hw, KS8842_SWITCH_CTRL_1_OFFSET,
+				SWITCH_RX_FLOW_CTRL)) ? 1 : 0;
+		pause->tx_pause =
+			(sw_chk(hw, KS8842_SWITCH_CTRL_1_OFFSET,
+				SWITCH_TX_FLOW_CTRL)) ? 1 : 0;
+	}
+}
+
+/**
+ * netdev_set_pauseparam - set flow control parameters
+ * @dev:	Network device.
+ * @pause:	Ethtool PAUSE settings data structure.
+ *
+ * This function sets the PAUSE control flow settings.
+ * Not implemented yet.
+ *
+ * Return 0 if successful; otherwise an error code.
+ */
+static int netdev_set_pauseparam(struct net_device *dev,
+	struct ethtool_pauseparam *pause)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_hw *hw = &hw_priv->hw;
+	struct ksz_port *port = &priv->port;
+
+	mutex_lock(&hw_priv->lock);
+	if (pause->autoneg) {
+		if (!pause->rx_pause && !pause->tx_pause)
+			port->flow_ctrl = PHY_NO_FLOW_CTRL;
+		else
+			port->flow_ctrl = PHY_FLOW_CTRL;
+		hw->overrides &= ~PAUSE_FLOW_CTRL;
+		port->force_link = 0;
+		if (hw->ksz_switch) {
+			sw_cfg(hw, KS8842_SWITCH_CTRL_1_OFFSET,
+				SWITCH_RX_FLOW_CTRL, 1);
+			sw_cfg(hw, KS8842_SWITCH_CTRL_1_OFFSET,
+				SWITCH_TX_FLOW_CTRL, 1);
+		}
+		port_set_link_speed(port);
+	} else {
+		hw->overrides |= PAUSE_FLOW_CTRL;
+		if (hw->ksz_switch) {
+			sw_cfg(hw, KS8842_SWITCH_CTRL_1_OFFSET,
+				SWITCH_RX_FLOW_CTRL, pause->rx_pause);
+			sw_cfg(hw, KS8842_SWITCH_CTRL_1_OFFSET,
+				SWITCH_TX_FLOW_CTRL, pause->tx_pause);
+		} else
+			set_flow_ctrl(hw, pause->rx_pause, pause->tx_pause);
+	}
+	mutex_unlock(&hw_priv->lock);
+
+	return 0;
+}
+
+/**
+ * netdev_get_ringparam - get tx/rx ring parameters
+ * @dev:	Network device.
+ * @ring:	Ethtool RING settings data structure.
+ *
+ * This procedure returns the TX/RX ring settings.
+ */
+static void netdev_get_ringparam(struct net_device *dev,
+	struct ethtool_ringparam *ring)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_hw *hw = &hw_priv->hw;
+
+	ring->tx_max_pending = (1 << 9);
+	ring->tx_pending = hw->tx_desc_info.alloc;
+	ring->rx_max_pending = (1 << 9);
+	ring->rx_pending = hw->rx_desc_info.alloc;
+}
+
+#define STATS_LEN			(TOTAL_PORT_COUNTER_NUM)
+
+static struct {
+	char string[ETH_GSTRING_LEN];
+} ethtool_stats_keys[STATS_LEN] = {
+	{ "rx_lo_priority_octets" },
+	{ "rx_hi_priority_octets" },
+	{ "rx_undersize_packets" },
+	{ "rx_fragments" },
+	{ "rx_oversize_packets" },
+	{ "rx_jabbers" },
+	{ "rx_symbol_errors" },
+	{ "rx_crc_errors" },
+	{ "rx_align_errors" },
+	{ "rx_mac_ctrl_packets" },
+	{ "rx_pause_packets" },
+	{ "rx_bcast_packets" },
+	{ "rx_mcast_packets" },
+	{ "rx_ucast_packets" },
+	{ "rx_64_or_less_octet_packets" },
+	{ "rx_65_to_127_octet_packets" },
+	{ "rx_128_to_255_octet_packets" },
+	{ "rx_256_to_511_octet_packets" },
+	{ "rx_512_to_1023_octet_packets" },
+	{ "rx_1024_to_1522_octet_packets" },
+
+	{ "tx_lo_priority_octets" },
+	{ "tx_hi_priority_octets" },
+	{ "tx_late_collisions" },
+	{ "tx_pause_packets" },
+	{ "tx_bcast_packets" },
+	{ "tx_mcast_packets" },
+	{ "tx_ucast_packets" },
+	{ "tx_deferred" },
+	{ "tx_total_collisions" },
+	{ "tx_excessive_collisions" },
+	{ "tx_single_collisions" },
+	{ "tx_mult_collisions" },
+
+	{ "rx_discards" },
+	{ "tx_discards" },
+};
+
+/**
+ * netdev_get_strings - get statistics identity strings
+ * @dev:	Network device.
+ * @stringset:	String set identifier.
+ * @buf:	Buffer to store the strings.
+ *
+ * This procedure returns the strings used to identify the statistics.
+ */
+static void netdev_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_hw *hw = &hw_priv->hw;
+
+	if (ETH_SS_STATS == stringset)
+		memcpy(buf, &ethtool_stats_keys,
+			ETH_GSTRING_LEN * hw->mib_cnt);
+}
+
+/**
+ * netdev_get_sset_count - get statistics size
+ * @dev:	Network device.
+ * @sset:	The statistics set number.
+ *
+ * This function returns the size of the statistics to be reported.
+ *
+ * Return size of the statistics to be reported.
+ */
+static int netdev_get_sset_count(struct net_device *dev, int sset)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_hw *hw = &hw_priv->hw;
+
+	switch (sset) {
+	case ETH_SS_STATS:
+		return hw->mib_cnt;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+/**
+ * netdev_get_ethtool_stats - get network device statistics
+ * @dev:	Network device.
+ * @stats:	Ethtool statistics data structure.
+ * @data:	Buffer to store the statistics.
+ *
+ * This procedure returns the statistics.
+ */
+static void netdev_get_ethtool_stats(struct net_device *dev,
+	struct ethtool_stats *stats, u64 *data)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_hw *hw = &hw_priv->hw;
+	struct ksz_port *port = &priv->port;
+	int n_stats = stats->n_stats;
+	int i;
+	int n;
+	int p;
+	u64 counter[TOTAL_PORT_COUNTER_NUM];
+
+	mutex_lock(&hw_priv->lock);
+	n = SWITCH_PORT_NUM;
+	for (i = 0, p = port->first_port; i < port->mib_port_cnt; i++, p++) {
+		if (media_connected == hw->port_mib[p].state) {
+			hw_priv->counter[p].read = 1;
+
+			/* Remember first port that requests read. */
+			if (n == SWITCH_PORT_NUM)
+				n = p;
+		}
+	}
+	mutex_unlock(&hw_priv->lock);
+
+	if (n < SWITCH_PORT_NUM)
+		schedule_work(&hw_priv->mib_read);
+
+	if (1 == port->mib_port_cnt && n < SWITCH_PORT_NUM) {
+		p = n;
+		wait_event_interruptible_timeout(
+			hw_priv->counter[p].counter,
+			2 == hw_priv->counter[p].read,
+			HZ * 1);
+	} else
+		for (i = 0, p = n; i < port->mib_port_cnt - n; i++, p++) {
+			if (0 == i) {
+				wait_event_interruptible_timeout(
+					hw_priv->counter[p].counter,
+					2 == hw_priv->counter[p].read,
+					HZ * 2);
+			} else if (hw->port_mib[p].cnt_ptr) {
+				wait_event_interruptible_timeout(
+					hw_priv->counter[p].counter,
+					2 == hw_priv->counter[p].read,
+					HZ * 1);
+			}
+		}
+
+	get_mib_counters(hw, port->first_port, port->mib_port_cnt, counter);
+	n = hw->mib_cnt;
+	if (n > n_stats)
+		n = n_stats;
+	n_stats -= n;
+	for (i = 0; i < n; i++)
+		*data++ = counter[i];
+}
+
+/**
+ * netdev_set_features - set receive checksum support
+ * @dev:	Network device.
+ * @features:	New device features (offloads).
+ *
+ * This function sets receive checksum support setting.
+ *
+ * Return 0 if successful; otherwise an error code.
+ */
+static int netdev_set_features(struct net_device *dev,
+	netdev_features_t features)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_hw *hw = &hw_priv->hw;
+
+	mutex_lock(&hw_priv->lock);
+
+	/* see note in hw_setup() */
+	if (features & NETIF_F_RXCSUM)
+		hw->rx_cfg |= DMA_RX_CSUM_TCP | DMA_RX_CSUM_IP;
+	else
+		hw->rx_cfg &= ~(DMA_RX_CSUM_TCP | DMA_RX_CSUM_IP);
+
+	if (hw->enabled)
+		writel(hw->rx_cfg, hw->io + KS_DMA_RX_CTRL);
+
+	mutex_unlock(&hw_priv->lock);
+
+	return 0;
+}
+
+static const struct ethtool_ops netdev_ethtool_ops = {
+	.nway_reset		= netdev_nway_reset,
+	.get_link		= netdev_get_link,
+	.get_drvinfo		= netdev_get_drvinfo,
+	.get_regs_len		= netdev_get_regs_len,
+	.get_regs		= netdev_get_regs,
+	.get_wol		= netdev_get_wol,
+	.set_wol		= netdev_set_wol,
+	.get_msglevel		= netdev_get_msglevel,
+	.set_msglevel		= netdev_set_msglevel,
+	.get_eeprom_len		= netdev_get_eeprom_len,
+	.get_eeprom		= netdev_get_eeprom,
+	.set_eeprom		= netdev_set_eeprom,
+	.get_pauseparam		= netdev_get_pauseparam,
+	.set_pauseparam		= netdev_set_pauseparam,
+	.get_ringparam		= netdev_get_ringparam,
+	.get_strings		= netdev_get_strings,
+	.get_sset_count		= netdev_get_sset_count,
+	.get_ethtool_stats	= netdev_get_ethtool_stats,
+	.get_link_ksettings	= netdev_get_link_ksettings,
+	.set_link_ksettings	= netdev_set_link_ksettings,
+};
+
+/*
+ * Hardware monitoring
+ */
+
+static void update_link(struct net_device *dev, struct dev_priv *priv,
+	struct ksz_port *port)
+{
+	if (priv->media_state != port->linked->state) {
+		priv->media_state = port->linked->state;
+		if (netif_running(dev))
+			set_media_state(dev, media_connected);
+	}
+}
+
+static void mib_read_work(struct work_struct *work)
+{
+	struct dev_info *hw_priv =
+		container_of(work, struct dev_info, mib_read);
+	struct ksz_hw *hw = &hw_priv->hw;
+	struct ksz_port_mib *mib;
+	int i;
+
+	next_jiffies = jiffies;
+	for (i = 0; i < hw->mib_port_cnt; i++) {
+		mib = &hw->port_mib[i];
+
+		/* Reading MIB counters or requested to read. */
+		if (mib->cnt_ptr || 1 == hw_priv->counter[i].read) {
+
+			/* Need to process receive interrupt. */
+			if (port_r_cnt(hw, i))
+				break;
+			hw_priv->counter[i].read = 0;
+
+			/* Finish reading counters. */
+			if (0 == mib->cnt_ptr) {
+				hw_priv->counter[i].read = 2;
+				wake_up_interruptible(
+					&hw_priv->counter[i].counter);
+			}
+		} else if (time_after_eq(jiffies, hw_priv->counter[i].time)) {
+			/* Only read MIB counters when the port is connected. */
+			if (media_connected == mib->state)
+				hw_priv->counter[i].read = 1;
+			next_jiffies += HZ * 1 * hw->mib_port_cnt;
+			hw_priv->counter[i].time = next_jiffies;
+
+		/* Port is just disconnected. */
+		} else if (mib->link_down) {
+			mib->link_down = 0;
+
+			/* Read counters one last time after link is lost. */
+			hw_priv->counter[i].read = 1;
+		}
+	}
+}
+
+static void mib_monitor(struct timer_list *t)
+{
+	struct dev_info *hw_priv = from_timer(hw_priv, t, mib_timer_info.timer);
+
+	mib_read_work(&hw_priv->mib_read);
+
+	/* This is used to verify Wake-on-LAN is working. */
+	if (hw_priv->pme_wait) {
+		if (time_is_before_eq_jiffies(hw_priv->pme_wait)) {
+			hw_clr_wol_pme_status(&hw_priv->hw);
+			hw_priv->pme_wait = 0;
+		}
+	} else if (hw_chk_wol_pme_status(&hw_priv->hw)) {
+
+		/* PME is asserted.  Wait 2 seconds to clear it. */
+		hw_priv->pme_wait = jiffies + HZ * 2;
+	}
+
+	ksz_update_timer(&hw_priv->mib_timer_info);
+}
+
+/**
+ * dev_monitor - periodic monitoring
+ * @t:	timer list containing a network device pointer.
+ *
+ * This routine is run in a kernel timer to monitor the network device.
+ */
+static void dev_monitor(struct timer_list *t)
+{
+	struct dev_priv *priv = from_timer(priv, t, monitor_timer_info.timer);
+	struct net_device *dev = priv->mii_if.dev;
+	struct dev_info *hw_priv = priv->adapter;
+	struct ksz_hw *hw = &hw_priv->hw;
+	struct ksz_port *port = &priv->port;
+
+	if (!(hw->features & LINK_INT_WORKING))
+		port_get_link_speed(port);
+	update_link(dev, priv, port);
+
+	ksz_update_timer(&priv->monitor_timer_info);
+}
+
+/*
+ * Linux network device interface functions
+ */
+
+/* Driver exported variables */
+
+static int msg_enable;
+
+static char *macaddr = ":";
+static char *mac1addr = ":";
+
+/*
+ * This enables multiple network device mode for KSZ8842, which contains a
+ * switch with two physical ports.  Some users like to take control of the
+ * ports for running Spanning Tree Protocol.  The driver will create an
+ * additional eth? device for the other port.
+ *
+ * Some limitations are the network devices cannot have different MTU and
+ * multicast hash tables.
+ */
+static int multi_dev;
+
+/*
+ * As most users select multiple network device mode to use Spanning Tree
+ * Protocol, this enables a feature in which most unicast and multicast packets
+ * are forwarded inside the switch and not passed to the host.  Only packets
+ * that need the host's attention are passed to it.  This prevents the host
+ * wasting CPU time to examine each and every incoming packets and do the
+ * forwarding itself.
+ *
+ * As the hack requires the private bridge header, the driver cannot compile
+ * with just the kernel headers.
+ *
+ * Enabling STP support also turns on multiple network device mode.
+ */
+static int stp;
+
+/*
+ * This enables fast aging in the KSZ8842 switch.  Not sure what situation
+ * needs that.  However, fast aging is used to flush the dynamic MAC table when
+ * STP support is enabled.
+ */
+static int fast_aging;
+
+/**
+ * netdev_init - initialize network device.
+ * @dev:	Network device.
+ *
+ * This function initializes the network device.
+ *
+ * Return 0 if successful; otherwise an error code indicating failure.
+ */
+static int __init netdev_init(struct net_device *dev)
+{
+	struct dev_priv *priv = netdev_priv(dev);
+
+	/* 500 ms timeout */
+	ksz_init_timer(&priv->monitor_timer_info, 500 * HZ / 1000,
+		dev_monitor);
+
+	/* 500 ms timeout */
+	dev->watchdog_timeo = HZ / 2;
+
+	dev->hw_features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_RXCSUM;
+
+	/*
+	 * Hardware does not really support IPv6 checksum generation, but
+	 * driver actually runs faster with this on.
+	 */
+	dev->hw_features |= NETIF_F_IPV6_CSUM;
+
+	dev->features |= dev->hw_features;
+
+	sema_init(&priv->proc_sem, 1);
+
+	priv->mii_if.phy_id_mask = 0x1;
+	priv->mii_if.reg_num_mask = 0x7;
+	priv->mii_if.dev = dev;
+	priv->mii_if.mdio_read = mdio_read;
+	priv->mii_if.mdio_write = mdio_write;
+	priv->mii_if.phy_id = priv->port.first_port + 1;
+
+	priv->msg_enable = netif_msg_init(msg_enable,
+		(NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK));
+
+	return 0;
+}
+
+static const struct net_device_ops netdev_ops = {
+	.ndo_init		= netdev_init,
+	.ndo_open		= netdev_open,
+	.ndo_stop		= netdev_close,
+	.ndo_get_stats		= netdev_query_statistics,
+	.ndo_start_xmit		= netdev_tx,
+	.ndo_tx_timeout		= netdev_tx_timeout,
+	.ndo_change_mtu		= netdev_change_mtu,
+	.ndo_set_features	= netdev_set_features,
+	.ndo_set_mac_address	= netdev_set_mac_address,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_do_ioctl		= netdev_ioctl,
+	.ndo_set_rx_mode	= netdev_set_rx_mode,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller	= netdev_netpoll,
+#endif
+};
+
+static void netdev_free(struct net_device *dev)
+{
+	if (dev->watchdog_timeo)
+		unregister_netdev(dev);
+
+	free_netdev(dev);
+}
+
+struct platform_info {
+	struct dev_info dev_info;
+	struct net_device *netdev[SWITCH_PORT_NUM];
+};
+
+static int net_device_present;
+
+static void get_mac_addr(struct dev_info *hw_priv, u8 *macaddr, int port)
+{
+	int i;
+	int j;
+	int got_num;
+	int num;
+
+	i = j = num = got_num = 0;
+	while (j < ETH_ALEN) {
+		if (macaddr[i]) {
+			int digit;
+
+			got_num = 1;
+			digit = hex_to_bin(macaddr[i]);
+			if (digit >= 0)
+				num = num * 16 + digit;
+			else if (':' == macaddr[i])
+				got_num = 2;
+			else
+				break;
+		} else if (got_num)
+			got_num = 2;
+		else
+			break;
+		if (2 == got_num) {
+			if (MAIN_PORT == port) {
+				hw_priv->hw.override_addr[j++] = (u8) num;
+				hw_priv->hw.override_addr[5] +=
+					hw_priv->hw.id;
+			} else {
+				hw_priv->hw.ksz_switch->other_addr[j++] =
+					(u8) num;
+				hw_priv->hw.ksz_switch->other_addr[5] +=
+					hw_priv->hw.id;
+			}
+			num = got_num = 0;
+		}
+		i++;
+	}
+	if (ETH_ALEN == j) {
+		if (MAIN_PORT == port)
+			hw_priv->hw.mac_override = 1;
+	}
+}
+
+#define KS884X_DMA_MASK			(~0x0UL)
+
+static void read_other_addr(struct ksz_hw *hw)
+{
+	int i;
+	u16 data[3];
+	struct ksz_switch *sw = hw->ksz_switch;
+
+	for (i = 0; i < 3; i++)
+		data[i] = eeprom_read(hw, i + EEPROM_DATA_OTHER_MAC_ADDR);
+	if ((data[0] || data[1] || data[2]) && data[0] != 0xffff) {
+		sw->other_addr[5] = (u8) data[0];
+		sw->other_addr[4] = (u8)(data[0] >> 8);
+		sw->other_addr[3] = (u8) data[1];
+		sw->other_addr[2] = (u8)(data[1] >> 8);
+		sw->other_addr[1] = (u8) data[2];
+		sw->other_addr[0] = (u8)(data[2] >> 8);
+	}
+}
+
+#ifndef PCI_VENDOR_ID_MICREL_KS
+#define PCI_VENDOR_ID_MICREL_KS		0x16c6
+#endif
+
+static int pcidev_init(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	struct net_device *dev;
+	struct dev_priv *priv;
+	struct dev_info *hw_priv;
+	struct ksz_hw *hw;
+	struct platform_info *info;
+	struct ksz_port *port;
+	unsigned long reg_base;
+	unsigned long reg_len;
+	int cnt;
+	int i;
+	int mib_port_count;
+	int pi;
+	int port_count;
+	int result;
+	char banner[sizeof(version)];
+	struct ksz_switch *sw = NULL;
+
+	result = pcim_enable_device(pdev);
+	if (result)
+		return result;
+
+	result = -ENODEV;
+
+	if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)) ||
+	    dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)))
+		return result;
+
+	reg_base = pci_resource_start(pdev, 0);
+	reg_len = pci_resource_len(pdev, 0);
+	if ((pci_resource_flags(pdev, 0) & IORESOURCE_IO) != 0)
+		return result;
+
+	if (!request_mem_region(reg_base, reg_len, DRV_NAME))
+		return result;
+	pci_set_master(pdev);
+
+	result = -ENOMEM;
+
+	info = kzalloc(sizeof(struct platform_info), GFP_KERNEL);
+	if (!info)
+		goto pcidev_init_dev_err;
+
+	hw_priv = &info->dev_info;
+	hw_priv->pdev = pdev;
+
+	hw = &hw_priv->hw;
+
+	hw->io = ioremap(reg_base, reg_len);
+	if (!hw->io)
+		goto pcidev_init_io_err;
+
+	cnt = hw_init(hw);
+	if (!cnt) {
+		if (msg_enable & NETIF_MSG_PROBE)
+			pr_alert("chip not detected\n");
+		result = -ENODEV;
+		goto pcidev_init_alloc_err;
+	}
+
+	snprintf(banner, sizeof(banner), "%s", version);
+	banner[13] = cnt + '0';		/* Replace x in "Micrel KSZ884x" */
+	dev_info(&hw_priv->pdev->dev, "%s\n", banner);
+	dev_dbg(&hw_priv->pdev->dev, "Mem = %p; IRQ = %d\n", hw->io, pdev->irq);
+
+	/* Assume device is KSZ8841. */
+	hw->dev_count = 1;
+	port_count = 1;
+	mib_port_count = 1;
+	hw->addr_list_size = 0;
+	hw->mib_cnt = PORT_COUNTER_NUM;
+	hw->mib_port_cnt = 1;
+
+	/* KSZ8842 has a switch with multiple ports. */
+	if (2 == cnt) {
+		if (fast_aging)
+			hw->overrides |= FAST_AGING;
+
+		hw->mib_cnt = TOTAL_PORT_COUNTER_NUM;
+
+		/* Multiple network device interfaces are required. */
+		if (multi_dev) {
+			hw->dev_count = SWITCH_PORT_NUM;
+			hw->addr_list_size = SWITCH_PORT_NUM - 1;
+		}
+
+		/* Single network device has multiple ports. */
+		if (1 == hw->dev_count) {
+			port_count = SWITCH_PORT_NUM;
+			mib_port_count = SWITCH_PORT_NUM;
+		}
+		hw->mib_port_cnt = TOTAL_PORT_NUM;
+		hw->ksz_switch = kzalloc(sizeof(struct ksz_switch), GFP_KERNEL);
+		if (!hw->ksz_switch)
+			goto pcidev_init_alloc_err;
+
+		sw = hw->ksz_switch;
+	}
+	for (i = 0; i < hw->mib_port_cnt; i++)
+		hw->port_mib[i].mib_start = 0;
+
+	hw->parent = hw_priv;
+
+	/* Default MTU is 1500. */
+	hw_priv->mtu = (REGULAR_RX_BUF_SIZE + 3) & ~3;
+
+	if (ksz_alloc_mem(hw_priv))
+		goto pcidev_init_mem_err;
+
+	hw_priv->hw.id = net_device_present;
+
+	spin_lock_init(&hw_priv->hwlock);
+	mutex_init(&hw_priv->lock);
+
+	for (i = 0; i < TOTAL_PORT_NUM; i++)
+		init_waitqueue_head(&hw_priv->counter[i].counter);
+
+	if (macaddr[0] != ':')
+		get_mac_addr(hw_priv, macaddr, MAIN_PORT);
+
+	/* Read MAC address and initialize override address if not overridden. */
+	hw_read_addr(hw);
+
+	/* Multiple device interfaces mode requires a second MAC address. */
+	if (hw->dev_count > 1) {
+		memcpy(sw->other_addr, hw->override_addr, ETH_ALEN);
+		read_other_addr(hw);
+		if (mac1addr[0] != ':')
+			get_mac_addr(hw_priv, mac1addr, OTHER_PORT);
+	}
+
+	hw_setup(hw);
+	if (hw->ksz_switch)
+		sw_setup(hw);
+	else {
+		hw_priv->wol_support = WOL_SUPPORT;
+		hw_priv->wol_enable = 0;
+	}
+
+	INIT_WORK(&hw_priv->mib_read, mib_read_work);
+
+	/* 500 ms timeout */
+	ksz_init_timer(&hw_priv->mib_timer_info, 500 * HZ / 1000,
+		mib_monitor);
+
+	for (i = 0; i < hw->dev_count; i++) {
+		dev = alloc_etherdev(sizeof(struct dev_priv));
+		if (!dev)
+			goto pcidev_init_reg_err;
+		SET_NETDEV_DEV(dev, &pdev->dev);
+		info->netdev[i] = dev;
+
+		priv = netdev_priv(dev);
+		priv->adapter = hw_priv;
+		priv->id = net_device_present++;
+
+		port = &priv->port;
+		port->port_cnt = port_count;
+		port->mib_port_cnt = mib_port_count;
+		port->first_port = i;
+		port->flow_ctrl = PHY_FLOW_CTRL;
+
+		port->hw = hw;
+		port->linked = &hw->port_info[port->first_port];
+
+		for (cnt = 0, pi = i; cnt < port_count; cnt++, pi++) {
+			hw->port_info[pi].port_id = pi;
+			hw->port_info[pi].pdev = dev;
+			hw->port_info[pi].state = media_disconnected;
+		}
+
+		dev->mem_start = (unsigned long) hw->io;
+		dev->mem_end = dev->mem_start + reg_len - 1;
+		dev->irq = pdev->irq;
+		if (MAIN_PORT == i)
+			memcpy(dev->dev_addr, hw_priv->hw.override_addr,
+			       ETH_ALEN);
+		else {
+			memcpy(dev->dev_addr, sw->other_addr, ETH_ALEN);
+			if (ether_addr_equal(sw->other_addr, hw->override_addr))
+				dev->dev_addr[5] += port->first_port;
+		}
+
+		dev->netdev_ops = &netdev_ops;
+		dev->ethtool_ops = &netdev_ethtool_ops;
+
+		/* MTU range: 60 - 1894 */
+		dev->min_mtu = ETH_ZLEN;
+		dev->max_mtu = MAX_RX_BUF_SIZE -
+			       (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
+
+		if (register_netdev(dev))
+			goto pcidev_init_reg_err;
+		port_set_power_saving(port, true);
+	}
+
+	pci_dev_get(hw_priv->pdev);
+	pci_set_drvdata(pdev, info);
+	return 0;
+
+pcidev_init_reg_err:
+	for (i = 0; i < hw->dev_count; i++) {
+		if (info->netdev[i]) {
+			netdev_free(info->netdev[i]);
+			info->netdev[i] = NULL;
+		}
+	}
+
+pcidev_init_mem_err:
+	ksz_free_mem(hw_priv);
+	kfree(hw->ksz_switch);
+
+pcidev_init_alloc_err:
+	iounmap(hw->io);
+
+pcidev_init_io_err:
+	kfree(info);
+
+pcidev_init_dev_err:
+	release_mem_region(reg_base, reg_len);
+
+	return result;
+}
+
+static void pcidev_exit(struct pci_dev *pdev)
+{
+	int i;
+	struct platform_info *info = pci_get_drvdata(pdev);
+	struct dev_info *hw_priv = &info->dev_info;
+
+	release_mem_region(pci_resource_start(pdev, 0),
+		pci_resource_len(pdev, 0));
+	for (i = 0; i < hw_priv->hw.dev_count; i++) {
+		if (info->netdev[i])
+			netdev_free(info->netdev[i]);
+	}
+	if (hw_priv->hw.io)
+		iounmap(hw_priv->hw.io);
+	ksz_free_mem(hw_priv);
+	kfree(hw_priv->hw.ksz_switch);
+	pci_dev_put(hw_priv->pdev);
+	kfree(info);
+}
+
+static int __maybe_unused pcidev_resume(struct device *dev_d)
+{
+	int i;
+	struct platform_info *info = dev_get_drvdata(dev_d);
+	struct dev_info *hw_priv = &info->dev_info;
+	struct ksz_hw *hw = &hw_priv->hw;
+
+	device_wakeup_disable(dev_d);
+
+	if (hw_priv->wol_enable)
+		hw_cfg_wol_pme(hw, 0);
+	for (i = 0; i < hw->dev_count; i++) {
+		if (info->netdev[i]) {
+			struct net_device *dev = info->netdev[i];
+
+			if (netif_running(dev)) {
+				netdev_open(dev);
+				netif_device_attach(dev);
+			}
+		}
+	}
+	return 0;
+}
+
+static int __maybe_unused pcidev_suspend(struct device *dev_d)
+{
+	int i;
+	struct platform_info *info = dev_get_drvdata(dev_d);
+	struct dev_info *hw_priv = &info->dev_info;
+	struct ksz_hw *hw = &hw_priv->hw;
+
+	/* Need to find a way to retrieve the device IP address. */
+	static const u8 net_addr[] = { 192, 168, 1, 1 };
+
+	for (i = 0; i < hw->dev_count; i++) {
+		if (info->netdev[i]) {
+			struct net_device *dev = info->netdev[i];
+
+			if (netif_running(dev)) {
+				netif_device_detach(dev);
+				netdev_close(dev);
+			}
+		}
+	}
+	if (hw_priv->wol_enable) {
+		hw_enable_wol(hw, hw_priv->wol_enable, net_addr);
+		hw_cfg_wol_pme(hw, 1);
+	}
+
+	device_wakeup_enable(dev_d);
+	return 0;
+}
+
+static char pcidev_name[] = "ksz884xp";
+
+static const struct pci_device_id pcidev_table[] = {
+	{ PCI_VENDOR_ID_MICREL_KS, 0x8841,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
+	{ PCI_VENDOR_ID_MICREL_KS, 0x8842,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
+	{ 0 }
+};
+
+MODULE_DEVICE_TABLE(pci, pcidev_table);
+
+static SIMPLE_DEV_PM_OPS(pcidev_pm_ops, pcidev_suspend, pcidev_resume);
+
+static struct pci_driver pci_device_driver = {
+	.driver.pm	= &pcidev_pm_ops,
+	.name		= pcidev_name,
+	.id_table	= pcidev_table,
+	.probe		= pcidev_init,
+	.remove		= pcidev_exit
+};
+
+module_pci_driver(pci_device_driver);
+
+MODULE_DESCRIPTION("KSZ8841/2 PCI network driver");
+MODULE_AUTHOR("Tristram Ha <Tristram.Ha@micrel.com>");
+MODULE_LICENSE("GPL");
+
+module_param_named(message, msg_enable, int, 0);
+MODULE_PARM_DESC(message, "Message verbosity level (0=none, 31=all)");
+
+module_param(macaddr, charp, 0);
+module_param(mac1addr, charp, 0);
+module_param(fast_aging, int, 0);
+module_param(multi_dev, int, 0);
+module_param(stp, int, 0);
+MODULE_PARM_DESC(macaddr, "MAC address");
+MODULE_PARM_DESC(mac1addr, "Second MAC address");
+MODULE_PARM_DESC(fast_aging, "Fast aging");
+MODULE_PARM_DESC(multi_dev, "Multiple device interfaces");
+MODULE_PARM_DESC(stp, "STP support");