Date:	Tue, 12 Apr 2011 18:11:14 +0200
From:	John Crispin <blogic@...nwrt.org>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	John Crispin <blogic@...nwrt.org>,
	Ralph Hempel <ralph.hempel@...tiq.com>,
	linux-mips@...ux-mips.org, netdev@...r.kernel.org
Subject: [PATCH 2/3] MIPS: lantiq: add ethernet driver

This patch adds the driver for the ETOP Packet Processing Engine (PPE32) found
inside the XWAY family of Lantiq MIPS SoCs. This driver makes 100MBit ethernet
work. Support for all 8 dma channels, gbit and the embedded switch found on
the ar9/vr9 still needs to be implemented.

Signed-off-by: John Crispin <blogic@...nwrt.org>
Signed-off-by: Ralph Hempel <ralph.hempel@...tiq.com>
Cc: linux-mips@...ux-mips.org
Cc: netdev@...r.kernel.org

--

This Patch thould go via the MIPS tree.

 .../mips/include/asm/mach-lantiq/lantiq_platform.h |   14 +
 .../mips/include/asm/mach-lantiq/xway/lantiq_soc.h |    4 +-
 drivers/net/Kconfig                                |    7 +
 drivers/net/Makefile                               |    1 +
 drivers/net/lantiq_etop.c                          |  710 ++++++++++++++++++++
 5 files changed, 734 insertions(+), 2 deletions(-)
 create mode 100644 drivers/net/lantiq_etop.c

diff --git a/arch/mips/include/asm/mach-lantiq/lantiq_platform.h b/arch/mips/include/asm/mach-lantiq/lantiq_platform.h
index 1f1dba6..d6b600c 100644
--- a/arch/mips/include/asm/mach-lantiq/lantiq_platform.h
+++ b/arch/mips/include/asm/mach-lantiq/lantiq_platform.h
@@ -10,6 +10,7 @@
 #define _LANTIQ_PLATFORM_H__
 
 #include <linux/mtd/partitions.h>
+#include <linux/socket.h>
 
 /* struct used to pass info to the pci core */
 enum {
@@ -43,4 +44,17 @@ struct ltq_pci_data {
 	int irq[16];
 };
 
+/* struct used to pass info to network drivers */
+enum {
+	MII_MODE,
+	REV_MII_MODE,
+};
+
+#define LTQ_ETH_DATA_CHAN_MAX	0x8
+struct ltq_eth_data {
+	struct sockaddr mac;
+	int mii_mode;
+	int channel[LTQ_ETH_DATA_CHAN_MAX];
+};
+
 #endif
diff --git a/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h b/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h
index 95f1882..0213601 100644
--- a/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h
+++ b/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h
@@ -81,8 +81,8 @@
 #define PMU_SWITCH		0x10000000
 
 /* ETOP - ethernet */
-#define LTQ_PPE32_BASE_ADDR	0xBE180000
-#define LTQ_PPE32_SIZE		0x40000
+#define LTQ_ETOP_BASE_ADDR	0x1E180000
+#define LTQ_ETOP_SIZE		0x40000
 
 /* DMA */
 #define LTQ_DMA_BASE_ADDR	0x1E104100
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index b30c688..4878587 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -2017,6 +2017,13 @@ config FTMAC100
 	  from Faraday. It is used on Faraday A320, Andes AG101 and some
 	  other ARM/NDS32 SoC's.
 
+config LANTIQ_ETOP
+	tristate "Lantiq SoC ETOP driver"
+	depends on SOC_TYPE_XWAY
+	help
+	  Support for the MII0 inside the Lantiq SoC
+
+
 source "drivers/net/fs_enet/Kconfig"
 
 source "drivers/net/octeon/Kconfig"
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index fbfca11..df71da7 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -261,6 +261,7 @@ obj-$(CONFIG_MLX4_CORE) += mlx4/
 obj-$(CONFIG_ENC28J60) += enc28j60.o
 obj-$(CONFIG_ETHOC) += ethoc.o
 obj-$(CONFIG_GRETH) += greth.o
+obj-$(CONFIG_LANTIQ_ETOP) += lantiq_etop.o
 
 obj-$(CONFIG_XTENSA_XT2000_SONIC) += xtsonic.o
 
diff --git a/drivers/net/lantiq_etop.c b/drivers/net/lantiq_etop.c
new file mode 100644
index 0000000..ec70a24
--- /dev/null
+++ b/drivers/net/lantiq_etop.c
@@ -0,0 +1,710 @@
+/*
+ *   This program is free software; you can redistribute it and/or modify it
+ *   under the terms of the GNU General Public License version 2 as published
+ *   by the Free Software Foundation.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+ *
+ *   Copyright (C) 2011 John Crispin <blogic@...nwrt.org>
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/uaccess.h>
+#include <linux/in.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/phy.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/skbuff.h>
+#include <linux/mm.h>
+#include <linux/platform_device.h>
+#include <linux/ethtool.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+
+#include <asm/checksum.h>
+
+#include <lantiq_soc.h>
+#include <xway_dma.h>
+#include <lantiq_platform.h>
+
+#define LTQ_ETOP_MDIO		0x11804
+#define MDIO_REQUEST		0x80000000
+#define MDIO_READ		0x40000000
+#define MDIO_ADDR_MASK		0x1f
+#define MDIO_ADDR_OFFSET	0x15
+#define MDIO_REG_MASK		0x1f
+#define MDIO_REG_OFFSET		0x10
+#define MDIO_VAL_MASK		0xffff
+
+#define PPE32_CGEN		0x800
+#define LQ_PPE32_ENET_MAC_CFG	0x1840
+
+#define LTQ_ETOP_ENETS0		0x11850
+#define LTQ_ETOP_MAC_DA0	0x1186C
+#define LTQ_ETOP_MAC_DA1	0x11870
+#define LTQ_ETOP_CFG		0x16020
+#define LTQ_ETOP_IGPLEN		0x16080
+
+#define MAX_DMA_CHAN            0x8
+#define MAX_DMA_CRC_LEN		0x4
+#define MAX_DMA_DATA_LEN	0x600
+
+#define ETOP_FTCU		BIT(28)
+#define ETOP_MII_MASK		0xf
+#define ETOP_MII_NORMAL		0xd
+#define ETOP_MII_REVERSE	0xe
+#define ETOP_PLEN_UNDER		0x40
+#define ETOP_CGEN		0x800
+
+#define IS_TX(x)		(x % 2)
+
+#define ltq_etop_r32(x)		ltq_r32(ltq_etop_membase + (x))
+#define ltq_etop_w32(x, y)	ltq_w32(x, ltq_etop_membase + (y))
+#define ltq_etop_w32_mask(x, y, z)	\
+		ltq_w32_mask(x, y, ltq_etop_membase + (z))
+
+static void __iomem *ltq_etop_membase;
+
+struct ltq_mii_priv {
+	struct ltq_eth_data *pldata;
+	struct resource *res;
+	struct net_device_stats stats;
+
+	struct mii_bus *mii_bus;
+	struct phy_device *phydev;
+
+	struct ltq_dma_channel dma[MAX_DMA_CHAN];
+	struct sk_buff *tx_skb[MAX_DMA_CHAN >> 1][LTQ_DESC_NUM];
+	struct sk_buff *rx_skb[MAX_DMA_CHAN >> 1][LTQ_DESC_NUM];
+
+	struct tasklet_struct rx_tasklet;
+	int rx_tasklet_running;
+	u32 rx_channel_mask;
+
+	struct tasklet_struct tx_tasklet;
+	int tx_tasklet_running;
+	u32 tx_channel_mask;
+	int tx_free[MAX_DMA_CHAN >> 1];
+};
+
+static int
+ltq_etop_alloc_rx_skb(struct ltq_mii_priv *priv, int ch, int desc)
+{
+	int idx = ch >> 1;
+
+	priv->rx_skb[idx][desc] = dev_alloc_skb(MAX_DMA_DATA_LEN);
+	if (!priv->rx_skb[idx][desc])
+		return -ENOMEM;
+
+	priv->dma[ch].desc_base[desc].addr = dma_map_single(NULL,
+			priv->rx_skb[idx][desc]->data,
+			MAX_DMA_DATA_LEN, DMA_FROM_DEVICE);
+	priv->dma[ch].desc_base[desc].addr =
+		CPHYSADDR(priv->rx_skb[idx][desc]->data);
+	priv->dma[ch].desc_base[desc].ctl =
+		LTQ_DMA_OWN | LTQ_DMA_RX_OFFSET(2) | MAX_DMA_DATA_LEN;
+	skb_reserve(priv->rx_skb[idx][desc], 2);
+	return 0;
+}
+
+static void
+ltq_etop_hw_receive(struct net_device *dev, struct ltq_mii_priv *priv, int ch)
+{
+	struct ltq_dma_desc *d = &priv->dma[ch].desc_base[priv->dma[ch].desc];
+	int len = (d->ctl & LTQ_DMA_SIZE_MASK) - MAX_DMA_CRC_LEN;
+	struct sk_buff *skb = priv->rx_skb[ch >> 1][priv->dma[ch].desc];
+
+	if (ltq_etop_alloc_rx_skb(priv, ch, priv->dma[ch].desc)) {
+		netdev_err(dev,
+			"failed to allocate new rx buffer, stopping DMA\n");
+		ltq_dma_close(&priv->dma[ch]);
+	}
+
+	priv->dma[ch].desc++;
+	priv->dma[ch].desc %= LTQ_DESC_NUM;
+
+	skb_put(skb, len);
+	skb->dev = dev;
+	skb->protocol = eth_type_trans(skb, dev);
+	netif_rx(skb);
+	priv->stats.rx_packets++;
+	priv->stats.rx_bytes += len;
+}
+
+static void
+ltq_etop_rx_tasklet(unsigned long _dev)
+{
+	struct net_device *dev = (struct net_device *)_dev;
+	struct ltq_mii_priv *priv = netdev_priv(dev);
+	unsigned long flags;
+	int max_irq = 16;
+
+	while (priv->rx_channel_mask && max_irq--) {
+		int ch = __fls(priv->rx_channel_mask);
+		int idx = priv->dma[ch].desc;
+		struct ltq_dma_desc *desc = &priv->dma[ch].desc_base[idx];
+
+		if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) == LTQ_DMA_C) {
+			/* this is a completed rx transaction */
+			ltq_etop_hw_receive(dev, priv, ch);
+		} else {
+			/* there are no more complete descriptors */
+			priv->rx_channel_mask &= ~BIT(ch);
+			ltq_dma_ack_irq(&priv->dma[ch]);
+		}
+	}
+
+	local_irq_save(flags);
+	priv->rx_tasklet_running = 0;
+	if (priv->rx_channel_mask) {
+		priv->rx_tasklet_running = 1;
+		tasklet_schedule(&priv->rx_tasklet);
+	}
+	local_irq_restore(flags);
+}
+
+static int
+ltq_etop_tx_housekeeping(struct net_device *dev, int ch)
+{
+	struct ltq_mii_priv *priv = netdev_priv(dev);
+	int idx = ch >> 1;
+	int start_queue = 0;
+
+	while ((priv->dma[ch].desc_base[priv->tx_free[idx]].ctl &
+			(LTQ_DMA_OWN | LTQ_DMA_C)) == LTQ_DMA_C) {
+		dev_kfree_skb_any(priv->tx_skb[idx][priv->tx_free[idx]]);
+		priv->tx_skb[idx][priv->tx_free[idx]] = NULL;
+		memset(&priv->dma[ch].desc_base[priv->tx_free[idx]], 0,
+			sizeof(struct ltq_dma_desc));
+		priv->tx_free[idx]++;
+		priv->tx_free[idx] %= LTQ_DESC_NUM;
+		start_queue = 1;
+	}
+	return start_queue;
+}
+
+static void
+ltq_etop_tx_tasklet(unsigned long _dev)
+{
+	struct net_device *dev = (struct net_device *)_dev;
+	struct ltq_mii_priv *priv = netdev_priv(dev);
+	int start_queue = 0;
+
+	while (priv->tx_channel_mask) {
+		int ch = __fls(priv->tx_channel_mask);
+		priv->tx_channel_mask &= ~BIT(ch);
+		start_queue |= ltq_etop_tx_housekeeping(dev, ch);
+		ltq_dma_ack_irq(&priv->dma[ch]);
+	}
+	if (start_queue)
+		netif_start_queue(dev);
+	priv->tx_tasklet_running = 0;
+}
+
+static irqreturn_t
+ltq_etop_dma_irq(int irq, void *_priv)
+{
+	struct ltq_mii_priv *priv = _priv;
+	int ch = irq - LTQ_DMA_CH0_INT;
+
+	if (!IS_TX(ch) && !priv->rx_tasklet_running) {
+		priv->rx_channel_mask |= BIT(ch);
+		priv->rx_tasklet_running = 1;
+		tasklet_schedule(&priv->rx_tasklet);
+	}
+
+	if (IS_TX(ch) && !priv->tx_tasklet_running) {
+		priv->tx_channel_mask |= BIT(ch);
+		priv->tx_tasklet_running = 1;
+		tasklet_schedule(&priv->tx_tasklet);
+	}
+	return IRQ_HANDLED;
+}
+
+static void
+ltq_etop_free_channel(struct net_device *dev, struct ltq_dma_channel *ch)
+{
+	struct ltq_mii_priv *priv = netdev_priv(dev);
+
+	ltq_dma_free(ch);
+	if (ch->irq)
+		free_irq(ch->irq, priv);
+
+	if (!IS_TX(ch->nr)) {
+		int desc;
+		for (desc = 0; desc < LTQ_DESC_NUM; desc++)
+			if (priv->rx_skb[ch->nr >> 1][desc])
+				dev_kfree_skb_any(
+					priv->rx_skb[ch->nr >> 1][desc]);
+	}
+}
+
+static void
+ltq_etop_hw_exit(struct net_device *dev)
+{
+	struct ltq_mii_priv *priv = netdev_priv(dev);
+	int ch;
+
+	ltq_pmu_disable(PMU_PPE);
+	for (ch = 0; ch < MAX_DMA_CHAN; ch++)
+		if (priv->pldata->channel[ch])
+			ltq_etop_free_channel(dev, &priv->dma[ch]);
+}
+
+static int
+ltq_etop_hw_init(struct net_device *dev)
+{
+	struct ltq_mii_priv *priv = netdev_priv(dev);
+	int ch;
+
+	ltq_pmu_enable(PMU_PPE);
+
+	if (priv->pldata->mii_mode == REV_MII_MODE)
+		ltq_etop_w32_mask(ETOP_MII_MASK,
+			ETOP_MII_REVERSE, LTQ_ETOP_CFG);
+	else
+		ltq_etop_w32_mask(ETOP_MII_MASK,
+			ETOP_MII_NORMAL, LTQ_ETOP_CFG);
+	ltq_etop_w32(PPE32_CGEN, LQ_PPE32_ENET_MAC_CFG);
+
+	ltq_dma_init_port(DMA_PORT_ETOP);
+
+	for (ch = 0; ch < MAX_DMA_CHAN; ch++) {
+		int irq = LTQ_DMA_CH0_INT + ch;
+
+		if (!priv->pldata->channel[ch])
+			continue;
+
+		priv->dma[ch].nr = ch;
+
+		if (IS_TX(priv->dma[ch].nr)) {
+			ltq_dma_alloc_tx(&priv->dma[ch]);
+			request_irq(irq, ltq_etop_dma_irq,
+				IRQF_DISABLED, "etop_tx", priv);
+		} else {
+			int desc;
+			ltq_dma_alloc_rx(&priv->dma[ch]);
+			for (desc = 0; desc < LTQ_DESC_NUM; desc++)
+				if (ltq_etop_alloc_rx_skb(priv, ch, desc))
+					return -ENOMEM;
+			request_irq(irq, ltq_etop_dma_irq,
+				IRQF_DISABLED, "etop_rx", priv);
+		}
+		priv->dma[ch].irq = irq;
+	}
+	tasklet_init(&priv->rx_tasklet, ltq_etop_rx_tasklet,
+		(unsigned long)dev);
+	tasklet_init(&priv->tx_tasklet, ltq_etop_tx_tasklet,
+		(unsigned long)dev);
+	return 0;
+}
+
+static int
+ltq_etop_mdio_wr(struct mii_bus *bus, int phy_addr, int phy_reg, u16 phy_data)
+{
+	u32 val = MDIO_REQUEST |
+		((phy_addr & MDIO_ADDR_MASK) << MDIO_ADDR_OFFSET) |
+		((phy_reg & MDIO_REG_MASK) << MDIO_REG_OFFSET) |
+		phy_data;
+
+	while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
+		;
+	ltq_etop_w32(val, LTQ_ETOP_MDIO);
+	return 0;
+}
+
+static int
+ltq_etop_mdio_rd(struct mii_bus *bus, int phy_addr, int phy_reg)
+{
+	u32 val = MDIO_REQUEST | MDIO_READ |
+		((phy_addr & MDIO_ADDR_MASK) << MDIO_ADDR_OFFSET) |
+		((phy_reg & MDIO_REG_MASK) << MDIO_REG_OFFSET);
+
+	while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
+		;
+	ltq_etop_w32(val, LTQ_ETOP_MDIO);
+	while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
+		;
+	val = ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_VAL_MASK;
+	return val;
+}
+
+static void
+ltq_etop_mdio_link(struct net_device *dev)
+{
+	struct ltq_mii_priv *priv = netdev_priv(dev);
+	struct phy_device *phydev = priv->phydev;
+
+	phy_print_status(phydev);
+}
+
+static int
+ltq_etop_mdio_probe(struct net_device *dev)
+{
+	struct ltq_mii_priv *priv = netdev_priv(dev);
+	struct phy_device *phydev = NULL;
+	int phy_addr;
+
+	for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
+		if (priv->mii_bus->phy_map[phy_addr]) {
+			phydev = priv->mii_bus->phy_map[phy_addr];
+			break;
+		}
+	}
+
+	if (!phydev) {
+		netdev_err(dev, "no PHY found\n");
+		return -ENODEV;
+	}
+
+	phydev = phy_connect(dev, dev_name(&phydev->dev), &ltq_etop_mdio_link,
+			0, PHY_INTERFACE_MODE_MII);
+
+	if (IS_ERR(phydev)) {
+		netdev_err(dev, "Could not attach to PHY\n");
+		return PTR_ERR(phydev);
+	}
+
+	phydev->supported &= (SUPPORTED_10baseT_Half
+			      | SUPPORTED_10baseT_Full
+			      | SUPPORTED_100baseT_Half
+			      | SUPPORTED_100baseT_Full
+			      | SUPPORTED_Autoneg
+			      | SUPPORTED_MII
+			      | SUPPORTED_TP);
+
+	phydev->advertising = phydev->supported;
+	priv->phydev = phydev;
+	pr_info("%s: attached PHY [%s] (phy_addr=%s, irq=%d)\n",
+	       dev->name, phydev->drv->name,
+	       dev_name(&phydev->dev), phydev->irq);
+
+	return 0;
+}
+
+static int
+ltq_etop_mdio_init(struct net_device *dev)
+{
+	struct ltq_mii_priv *priv = netdev_priv(dev);
+	int i;
+	int err;
+
+	priv->mii_bus = mdiobus_alloc();
+	if (!priv->mii_bus) {
+		netdev_err(dev, "failed to allocate mii bus\n");
+		err = -ENOMEM;
+		goto err_out;
+	}
+
+	priv->mii_bus->priv = dev;
+	priv->mii_bus->read = ltq_etop_mdio_rd;
+	priv->mii_bus->write = ltq_etop_mdio_wr;
+	priv->mii_bus->name = "ltq_mii";
+	snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%x", 0);
+	priv->mii_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
+	if (!priv->mii_bus->irq) {
+		err = -ENOMEM;
+		goto err_out_free_mdiobus;
+	}
+
+	for (i = 0; i < PHY_MAX_ADDR; ++i)
+		priv->mii_bus->irq[i] = PHY_POLL;
+
+	if (mdiobus_register(priv->mii_bus)) {
+		err = -ENXIO;
+		goto err_out_free_mdio_irq;
+	}
+
+	if (ltq_etop_mdio_probe(dev)) {
+		err = -ENXIO;
+		goto err_out_unregister_bus;
+	}
+	return 0;
+
+err_out_unregister_bus:
+	mdiobus_unregister(priv->mii_bus);
+err_out_free_mdio_irq:
+	kfree(priv->mii_bus->irq);
+err_out_free_mdiobus:
+	mdiobus_free(priv->mii_bus);
+err_out:
+	return err;
+}
+
+static void
+ltq_etop_mdio_cleanup(struct net_device *dev)
+{
+	struct ltq_mii_priv *priv = netdev_priv(dev);
+	phy_disconnect(priv->phydev);
+	mdiobus_unregister(priv->mii_bus);
+	kfree(priv->mii_bus->irq);
+	mdiobus_free(priv->mii_bus);
+}
+
+static int
+ltq_etop_open(struct net_device *dev)
+{
+	struct ltq_mii_priv *priv = netdev_priv(dev);
+	int ch;
+
+	for (ch = 0; ch < MAX_DMA_CHAN; ch++)
+		if (priv->pldata->channel[ch])
+			ltq_dma_open(&priv->dma[ch]);
+	netif_start_queue(dev);
+	return 0;
+}
+
+static int
+ltq_etop_stop(struct net_device *dev)
+{
+	struct ltq_mii_priv *priv = netdev_priv(dev);
+	int ch;
+
+	for (ch = 0; ch < MAX_DMA_CHAN; ch++)
+		if (priv->pldata->channel[ch])
+			ltq_dma_close(&priv->dma[ch]);
+	netif_stop_queue(dev);
+	return 0;
+}
+
+static int
+ltq_etop_tx(struct sk_buff *skb, struct net_device *dev)
+{
+	int ch = 1;
+	struct ltq_mii_priv *priv = netdev_priv(dev);
+	struct ltq_dma_desc *d = &priv->dma[ch].desc_base[priv->dma[ch].desc];
+	int len;
+	unsigned long flags;
+	u32 byte_offset;
+
+	len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;
+	dev->trans_start = jiffies;
+
+	if ((d->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) ||
+			priv->tx_skb[ch >> 1][priv->dma[ch].desc]) {
+		priv->stats.tx_errors++;
+		priv->stats.tx_dropped++;
+		dev_kfree_skb_any(skb);
+		netdev_err(dev, "tx ring full\n");
+		netif_stop_queue(dev);
+		return NETDEV_TX_BUSY;
+	}
+
+	/* dma needs to start on a 16 byte aligned address */
+	byte_offset = CPHYSADDR(skb->data) % 16;
+	priv->tx_skb[ch >> 1][priv->dma[ch].desc] = skb;
+
+	local_irq_save(flags);
+	d->addr = ((unsigned int) dma_map_single(NULL, skb->data, len,
+						DMA_TO_DEVICE)) - byte_offset;
+	wmb();
+	d->ctl = LTQ_DMA_OWN | LTQ_DMA_SOP | LTQ_DMA_EOP |
+		LTQ_DMA_TX_OFFSET(byte_offset) | (len & LTQ_DMA_SIZE_MASK);
+	local_irq_restore(flags);
+
+	priv->dma[ch].desc++;
+	priv->dma[ch].desc %= LTQ_DESC_NUM;
+
+	if (priv->dma[ch].desc_base[priv->dma[ch].desc].ctl & LTQ_DMA_OWN)
+		netif_stop_queue(dev);
+
+	priv->stats.tx_packets++;
+	priv->stats.tx_bytes += len;
+	return NETDEV_TX_OK;
+}
+
+static void
+ltq_etop_tx_timeout(struct net_device *dev)
+{
+	struct ltq_mii_priv *priv = netdev_priv(dev);
+
+	priv->stats.tx_errors++;
+	netif_wake_queue(dev);
+}
+
+static int
+ltq_etop_change_mtu(struct net_device *dev, int new_mtu)
+{
+	int retval = eth_change_mtu(dev, new_mtu);
+
+	if (!retval)
+		ltq_etop_w32((ETOP_PLEN_UNDER << 16) | new_mtu,
+			LTQ_ETOP_IGPLEN);
+	return retval;
+}
+
+static int
+ltq_etop_set_mac_address(struct net_device *dev, void *p)
+{
+	int retcode = eth_mac_addr(dev, p);
+
+	if (!retcode) {
+		/* store the mac for the unicast filter */
+		ltq_etop_w32(*((u32 *)dev->dev_addr), LTQ_ETOP_MAC_DA0);
+		ltq_etop_w32(*((u16 *)&dev->dev_addr[4]) << 16,
+			LTQ_ETOP_MAC_DA1);
+	}
+	return retcode;
+}
+
+static void
+ltq_etop_set_multicast_list(struct net_device *dev)
+{
+	/* ensure that the unicast filter is not enabled in promiscious mode */
+	if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI))
+		ltq_etop_w32_mask(ETOP_FTCU, 0, LTQ_ETOP_ENETS0);
+	else
+		ltq_etop_w32_mask(0, ETOP_FTCU, LTQ_ETOP_ENETS0);
+}
+
+static int
+ltq_etop_init(struct net_device *dev)
+{
+	struct ltq_mii_priv *priv = netdev_priv(dev);
+	int err;
+
+	ether_setup(dev);
+	dev->watchdog_timeo = 10 * HZ;
+	err = ltq_etop_hw_init(dev);
+	if (err)
+		goto err_hw;
+	ltq_etop_change_mtu(dev, 1500);
+	err = ltq_etop_set_mac_address(dev, &priv->pldata->mac);
+	if (err)
+		goto err_netdev;
+	ltq_etop_set_multicast_list(dev);
+	err = ltq_etop_mdio_init(dev);
+	if (err)
+		goto err_netdev;
+	return 0;
+
+err_netdev:
+	unregister_netdev(dev);
+	free_netdev(dev);
+err_hw:
+	ltq_etop_hw_exit(dev);
+	return err;
+}
+
+static const struct net_device_ops ltq_eth_netdev_ops = {
+	.ndo_open = ltq_etop_open,
+	.ndo_stop = ltq_etop_stop,
+	.ndo_start_xmit = ltq_etop_tx,
+	.ndo_tx_timeout = ltq_etop_tx_timeout,
+	.ndo_change_mtu = ltq_etop_change_mtu,
+	.ndo_set_mac_address = ltq_etop_set_mac_address,
+	.ndo_validate_addr = eth_validate_addr,
+	.ndo_set_multicast_list = ltq_etop_set_multicast_list,
+	.ndo_init = ltq_etop_init,
+};
+
+static int __init
+ltq_etop_probe(struct platform_device *pdev)
+{
+	struct net_device *dev;
+	struct ltq_mii_priv *priv;
+	struct resource *res;
+	int err;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "failed to get etop resource\n");
+		err = -ENOENT;
+		goto err_out;
+	}
+
+	res = devm_request_mem_region(&pdev->dev, res->start,
+		resource_size(res), dev_name(&pdev->dev));
+	if (!res) {
+		dev_err(&pdev->dev, "failed to request etop resource\n");
+		err = -EBUSY;
+		goto err_out;
+	}
+
+	ltq_etop_membase = devm_ioremap_nocache(&pdev->dev,
+		res->start, resource_size(res));
+	if (!ltq_etop_membase) {
+		dev_err(&pdev->dev, "failed to remap etop engine %d\n",
+			pdev->id);
+		err = -ENOMEM;
+		goto err_out;
+	}
+
+	dev = alloc_etherdev(sizeof(struct ltq_mii_priv));
+	strcpy(dev->name, "eth%d");
+	dev->netdev_ops = &ltq_eth_netdev_ops;
+	priv = netdev_priv(dev);
+	priv->res = res;
+	priv->pldata = dev_get_platdata(&pdev->dev);
+
+	err = register_netdev(dev);
+	if (err)
+		goto err_free;
+
+	platform_set_drvdata(pdev, dev);
+	return 0;
+
+err_free:
+	kfree(dev);
+err_out:
+	return err;
+}
+
+static int __devexit
+ltq_etop_remove(struct platform_device *pdev)
+{
+	struct net_device *dev = platform_get_drvdata(pdev);
+
+	if (dev) {
+		netif_stop_queue(dev);
+		ltq_etop_hw_exit(dev);
+		ltq_etop_mdio_cleanup(dev);
+		unregister_netdev(dev);
+	}
+	return 0;
+}
+
+static struct platform_driver ltq_mii_driver = {
+	.remove = __devexit_p(ltq_etop_remove),
+	.driver = {
+		.name = "ltq_etop",
+		.owner = THIS_MODULE,
+	},
+};
+
+int __init
+init_ltq_etop(void)
+{
+	int ret = platform_driver_probe(&ltq_mii_driver, ltq_etop_probe);
+
+	if (ret)
+		pr_err("ltq_etop: Error registering platfom driver!");
+	return ret;
+}
+
+static void __exit
+exit_ltq_etop(void)
+{
+	platform_driver_unregister(&ltq_mii_driver);
+}
+
+module_init(init_ltq_etop);
+module_exit(exit_ltq_etop);
+
+MODULE_AUTHOR("John Crispin <blogic@...nwrt.org>");
+MODULE_DESCRIPTION("Lantiq SoC ETOP");
+MODULE_LICENSE("GPL");
-- 
1.7.2.3

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