1 files changed, 1358 insertions, 0 deletions

diff --git a/target/linux/cns3xxx/files/drivers/net/ethernet/cavium/cns3xxx_eth.c b/target/linux/cns3xxx/files/drivers/net/ethernet/cavium/cns3xxx_eth.c
new file mode 100644
index 0000000..e2db636
--- /dev/null
+++ b/target/linux/cns3xxx/files/drivers/net/ethernet/cavium/cns3xxx_eth.c
@@ -0,0 +1,1358 @@
+/*
+ * Cavium CNS3xxx Gigabit driver for Linux
+ *
+ * Copyright 2011 Gateworks Corporation
+ *		  Chris Lang <clang@gateworks.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/etherdevice.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/phy.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/cns3xxx.h>
+#include <linux/skbuff.h>
+
+#define DRV_NAME "cns3xxx_eth"
+
+#define RX_DESCS 256
+#define TX_DESCS 128
+#define TX_DESC_RESERVE	20
+
+#define RX_POOL_ALLOC_SIZE (sizeof(struct rx_desc) * RX_DESCS)
+#define TX_POOL_ALLOC_SIZE (sizeof(struct tx_desc) * TX_DESCS)
+#define REGS_SIZE 336
+
+#define RX_BUFFER_ALIGN 64
+#define RX_BUFFER_ALIGN_MASK (~(RX_BUFFER_ALIGN - 1))
+
+#define SKB_HEAD_ALIGN (((PAGE_SIZE - NET_SKB_PAD) % RX_BUFFER_ALIGN) + NET_SKB_PAD + NET_IP_ALIGN)
+#define RX_SEGMENT_ALLOC_SIZE 2048
+#define RX_SEGMENT_BUFSIZE (SKB_WITH_OVERHEAD(RX_SEGMENT_ALLOC_SIZE))
+#define RX_SEGMENT_MRU (((RX_SEGMENT_BUFSIZE - SKB_HEAD_ALIGN) & RX_BUFFER_ALIGN_MASK) - NET_IP_ALIGN)
+#define MAX_MTU	9500
+
+#define NAPI_WEIGHT 64
+
+/* MDIO Defines */
+#define MDIO_CMD_COMPLETE 0x00008000
+#define MDIO_WRITE_COMMAND 0x00002000
+#define MDIO_READ_COMMAND 0x00004000
+#define MDIO_REG_OFFSET 8
+#define MDIO_VALUE_OFFSET 16
+
+/* Descritor Defines */
+#define END_OF_RING 0x40000000
+#define FIRST_SEGMENT 0x20000000
+#define LAST_SEGMENT 0x10000000
+#define FORCE_ROUTE 0x04000000
+#define IP_CHECKSUM 0x00040000
+#define UDP_CHECKSUM 0x00020000
+#define TCP_CHECKSUM 0x00010000
+
+/* Port Config Defines */
+#define PORT_BP_ENABLE 0x00020000
+#define PORT_DISABLE 0x00040000
+#define PORT_LEARN_DIS 0x00080000
+#define PORT_BLOCK_STATE 0x00100000
+#define PORT_BLOCK_MODE 0x00200000
+
+#define PROMISC_OFFSET 29
+
+/* Global Config Defines */
+#define UNKNOWN_VLAN_TO_CPU 0x02000000
+#define ACCEPT_CRC_PACKET 0x00200000
+#define CRC_STRIPPING 0x00100000
+
+/* VLAN Config Defines */
+#define NIC_MODE 0x00008000
+#define VLAN_UNAWARE 0x00000001
+
+/* DMA AUTO Poll Defines */
+#define TS_POLL_EN 0x00000020
+#define TS_SUSPEND 0x00000010
+#define FS_POLL_EN 0x00000002
+#define FS_SUSPEND 0x00000001
+
+/* DMA Ring Control Defines */
+#define QUEUE_THRESHOLD 0x000000f0
+#define CLR_FS_STATE 0x80000000
+
+/* Interrupt Status Defines */
+#define MAC0_STATUS_CHANGE 0x00004000
+#define MAC1_STATUS_CHANGE 0x00008000
+#define MAC2_STATUS_CHANGE 0x00010000
+#define MAC0_RX_ERROR 0x00100000
+#define MAC1_RX_ERROR 0x00200000
+#define MAC2_RX_ERROR 0x00400000
+
+struct tx_desc
+{
+	u32 sdp; /* segment data pointer */
+
+	union {
+		struct {
+			u32 sdl:16; /* segment data length */
+			u32 tco:1;
+			u32 uco:1;
+			u32 ico:1;
+			u32 rsv_1:3; /* reserve */
+			u32 pri:3;
+			u32 fp:1; /* force priority */
+			u32 fr:1;
+			u32 interrupt:1;
+			u32 lsd:1;
+			u32 fsd:1;
+			u32 eor:1;
+			u32 cown:1;
+		};
+		u32 config0;
+	};
+
+	union {
+		struct {
+			u32 ctv:1;
+			u32 stv:1;
+			u32 sid:4;
+			u32 inss:1;
+			u32 dels:1;
+			u32 rsv_2:9;
+			u32 pmap:5;
+			u32 mark:3;
+			u32 ewan:1;
+			u32 fewan:1;
+			u32 rsv_3:5;
+		};
+		u32 config1;
+	};
+
+	union {
+		struct {
+			u32 c_vid:12;
+			u32 c_cfs:1;
+			u32 c_pri:3;
+			u32 s_vid:12;
+			u32 s_dei:1;
+			u32 s_pri:3;
+		};
+		u32 config2;
+	};
+
+	u8 alignment[16]; /* for 32 byte */
+};
+
+struct rx_desc
+{
+	u32 sdp; /* segment data pointer */
+
+	union {
+		struct {
+			u32 sdl:16; /* segment data length */
+			u32 l4f:1;
+			u32 ipf:1;
+			u32 prot:4;
+			u32 hr:6;
+			u32 lsd:1;
+			u32 fsd:1;
+			u32 eor:1;
+			u32 cown:1;
+		};
+		u32 config0;
+	};
+
+	union {
+		struct {
+			u32 ctv:1;
+			u32 stv:1;
+			u32 unv:1;
+			u32 iwan:1;
+			u32 exdv:1;
+			u32 e_wan:1;
+			u32 rsv_1:2;
+			u32 sp:3;
+			u32 crc_err:1;
+			u32 un_eth:1;
+			u32 tc:2;
+			u32 rsv_2:1;
+			u32 ip_offset:5;
+			u32 rsv_3:11;
+		};
+		u32 config1;
+	};
+
+	union {
+		struct {
+			u32 c_vid:12;
+			u32 c_cfs:1;
+			u32 c_pri:3;
+			u32 s_vid:12;
+			u32 s_dei:1;
+			u32 s_pri:3;
+		};
+		u32 config2;
+	};
+
+	u8 alignment[16]; /* for 32 byte alignment */
+};
+
+
+struct switch_regs {
+	u32 phy_control;
+	u32 phy_auto_addr;
+	u32 mac_glob_cfg;
+	u32 mac_cfg[4];
+	u32 mac_pri_ctrl[5], __res;
+	u32 etype[2];
+	u32 udp_range[4];
+	u32 prio_etype_udp;
+	u32 prio_ipdscp[8];
+	u32 tc_ctrl;
+	u32 rate_ctrl;
+	u32 fc_glob_thrs;
+	u32 fc_port_thrs;
+	u32 mc_fc_glob_thrs;
+	u32 dc_glob_thrs;
+	u32 arl_vlan_cmd;
+	u32 arl_ctrl[3];
+	u32 vlan_cfg;
+	u32 pvid[2];
+	u32 vlan_ctrl[3];
+	u32 session_id[8];
+	u32 intr_stat;
+	u32 intr_mask;
+	u32 sram_test;
+	u32 mem_queue;
+	u32 farl_ctrl;
+	u32 fc_input_thrs, __res1[2];
+	u32 clk_skew_ctrl;
+	u32 mac_glob_cfg_ext, __res2[2];
+	u32 dma_ring_ctrl;
+	u32 dma_auto_poll_cfg;
+	u32 delay_intr_cfg, __res3;
+	u32 ts_dma_ctrl0;
+	u32 ts_desc_ptr0;
+	u32 ts_desc_base_addr0, __res4;
+	u32 fs_dma_ctrl0;
+	u32 fs_desc_ptr0;
+	u32 fs_desc_base_addr0, __res5;
+	u32 ts_dma_ctrl1;
+	u32 ts_desc_ptr1;
+	u32 ts_desc_base_addr1, __res6;
+	u32 fs_dma_ctrl1;
+	u32 fs_desc_ptr1;
+	u32 fs_desc_base_addr1;
+	u32 __res7[109];
+	u32 mac_counter0[13];
+};
+
+struct _tx_ring {
+	struct tx_desc *desc;
+	dma_addr_t phys_addr;
+	struct tx_desc *cur_addr;
+	struct sk_buff *buff_tab[TX_DESCS];
+	unsigned int phys_tab[TX_DESCS];
+	u32 free_index;
+	u32 count_index;
+	u32 cur_index;
+	int num_used;
+	int num_count;
+	bool stopped;
+};
+
+struct _rx_ring {
+	struct rx_desc *desc;
+	dma_addr_t phys_addr;
+	struct rx_desc *cur_addr;
+	void *buff_tab[RX_DESCS];
+	unsigned int phys_tab[RX_DESCS];
+	u32 cur_index;
+	u32 alloc_index;
+	int alloc_count;
+};
+
+struct sw {
+	struct switch_regs __iomem *regs;
+	struct napi_struct napi;
+	struct cns3xxx_plat_info *plat;
+	struct _tx_ring tx_ring;
+	struct _rx_ring rx_ring;
+	struct sk_buff *frag_first;
+	struct sk_buff *frag_last;
+	struct device *dev;
+	int rx_irq;
+	int stat_irq;
+};
+
+struct port {
+	struct net_device *netdev;
+	struct phy_device *phydev;
+	struct sw *sw;
+	int id;			/* logical port ID */
+	int speed, duplex;
+};
+
+static spinlock_t mdio_lock;
+static DEFINE_SPINLOCK(tx_lock);
+static struct switch_regs __iomem *mdio_regs; /* mdio command and status only */
+struct mii_bus *mdio_bus;
+static int ports_open;
+static struct port *switch_port_tab[4];
+static struct dma_pool *rx_dma_pool;
+static struct dma_pool *tx_dma_pool;
+struct net_device *napi_dev;
+
+static int cns3xxx_mdio_cmd(struct mii_bus *bus, int phy_id, int location,
+			   int write, u16 cmd)
+{
+	int cycles = 0;
+	u32 temp = 0;
+
+	temp = __raw_readl(&mdio_regs->phy_control);
+	temp |= MDIO_CMD_COMPLETE;
+	__raw_writel(temp, &mdio_regs->phy_control);
+	udelay(10);
+
+	if (write) {
+		temp = (cmd << MDIO_VALUE_OFFSET);
+		temp |= MDIO_WRITE_COMMAND;
+	} else {
+		temp = MDIO_READ_COMMAND;
+	}
+	temp |= ((location & 0x1f) << MDIO_REG_OFFSET);
+	temp |= (phy_id & 0x1f);
+
+	__raw_writel(temp, &mdio_regs->phy_control);
+
+	while (((__raw_readl(&mdio_regs->phy_control) & MDIO_CMD_COMPLETE) == 0)
+			&& cycles < 5000) {
+		udelay(1);
+		cycles++;
+	}
+
+	if (cycles == 5000) {
+		printk(KERN_ERR "%s #%i: MII transaction failed\n", bus->name,
+		       phy_id);
+		return -1;
+	}
+
+	temp = __raw_readl(&mdio_regs->phy_control);
+	temp |= MDIO_CMD_COMPLETE;
+	__raw_writel(temp, &mdio_regs->phy_control);
+
+	if (write)
+		return 0;
+
+	return ((temp >> MDIO_VALUE_OFFSET) & 0xFFFF);
+}
+
+static int cns3xxx_mdio_read(struct mii_bus *bus, int phy_id, int location)
+{
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&mdio_lock, flags);
+	ret = cns3xxx_mdio_cmd(bus, phy_id, location, 0, 0);
+	spin_unlock_irqrestore(&mdio_lock, flags);
+	return ret;
+}
+
+static int cns3xxx_mdio_write(struct mii_bus *bus, int phy_id, int location,
+			     u16 val)
+{
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&mdio_lock, flags);
+	ret = cns3xxx_mdio_cmd(bus, phy_id, location, 1, val);
+	spin_unlock_irqrestore(&mdio_lock, flags);
+	return ret;
+}
+
+static int cns3xxx_mdio_register(void __iomem *base)
+{
+	int err;
+
+	if (!(mdio_bus = mdiobus_alloc()))
+		return -ENOMEM;
+
+	mdio_regs = base;
+
+	spin_lock_init(&mdio_lock);
+	mdio_bus->name = "CNS3xxx MII Bus";
+	mdio_bus->read = &cns3xxx_mdio_read;
+	mdio_bus->write = &cns3xxx_mdio_write;
+	strcpy(mdio_bus->id, "0");
+
+	if ((err = mdiobus_register(mdio_bus)))
+		mdiobus_free(mdio_bus);
+	return err;
+}
+
+static void cns3xxx_mdio_remove(void)
+{
+	mdiobus_unregister(mdio_bus);
+	mdiobus_free(mdio_bus);
+}
+
+static void enable_tx_dma(struct sw *sw)
+{
+	__raw_writel(0x1, &sw->regs->ts_dma_ctrl0);
+}
+
+static void enable_rx_dma(struct sw *sw)
+{
+	__raw_writel(0x1, &sw->regs->fs_dma_ctrl0);
+}
+
+static void cns3xxx_adjust_link(struct net_device *dev)
+{
+	struct port *port = netdev_priv(dev);
+	struct phy_device *phydev = port->phydev;
+
+	if (!phydev->link) {
+		if (port->speed) {
+			port->speed = 0;
+			printk(KERN_INFO "%s: link down\n", dev->name);
+		}
+		return;
+	}
+
+	if (port->speed == phydev->speed && port->duplex == phydev->duplex)
+		return;
+
+	port->speed = phydev->speed;
+	port->duplex = phydev->duplex;
+
+	printk(KERN_INFO "%s: link up, speed %u Mb/s, %s duplex\n",
+	       dev->name, port->speed, port->duplex ? "full" : "half");
+}
+
+static void eth_schedule_poll(struct sw *sw)
+{
+	if (unlikely(!napi_schedule_prep(&sw->napi)))
+		return;
+
+	disable_irq_nosync(sw->rx_irq);
+	__napi_schedule(&sw->napi);
+}
+
+irqreturn_t eth_rx_irq(int irq, void *pdev)
+{
+	struct net_device *dev = pdev;
+	struct sw *sw = netdev_priv(dev);
+	eth_schedule_poll(sw);
+	return (IRQ_HANDLED);
+}
+
+irqreturn_t eth_stat_irq(int irq, void *pdev)
+{
+	struct net_device *dev = pdev;
+	struct sw *sw = netdev_priv(dev);
+	u32 cfg;
+	u32 stat = __raw_readl(&sw->regs->intr_stat);
+	__raw_writel(0xffffffff, &sw->regs->intr_stat);
+
+	if (stat & MAC2_RX_ERROR)
+		switch_port_tab[3]->netdev->stats.rx_dropped++;
+	if (stat & MAC1_RX_ERROR)
+		switch_port_tab[1]->netdev->stats.rx_dropped++;
+	if (stat & MAC0_RX_ERROR)
+		switch_port_tab[0]->netdev->stats.rx_dropped++;
+
+	if (stat & MAC0_STATUS_CHANGE) {
+		cfg = __raw_readl(&sw->regs->mac_cfg[0]);
+		switch_port_tab[0]->phydev->link = (cfg & 0x1);
+		switch_port_tab[0]->phydev->duplex = ((cfg >> 4) & 0x1);
+		if (((cfg >> 2) & 0x3) == 2)
+			switch_port_tab[0]->phydev->speed = 1000;
+		else if (((cfg >> 2) & 0x3) == 1)
+			switch_port_tab[0]->phydev->speed = 100;
+		else
+			switch_port_tab[0]->phydev->speed = 10;
+		cns3xxx_adjust_link(switch_port_tab[0]->netdev);
+	}
+
+	if (stat & MAC1_STATUS_CHANGE) {
+		cfg = __raw_readl(&sw->regs->mac_cfg[1]);
+		switch_port_tab[1]->phydev->link = (cfg & 0x1);
+		switch_port_tab[1]->phydev->duplex = ((cfg >> 4) & 0x1);
+		if (((cfg >> 2) & 0x3) == 2)
+			switch_port_tab[1]->phydev->speed = 1000;
+		else if (((cfg >> 2) & 0x3) == 1)
+			switch_port_tab[1]->phydev->speed = 100;
+		else
+			switch_port_tab[1]->phydev->speed = 10;
+		cns3xxx_adjust_link(switch_port_tab[1]->netdev);
+	}
+
+	if (stat & MAC2_STATUS_CHANGE) {
+		cfg = __raw_readl(&sw->regs->mac_cfg[3]);
+		switch_port_tab[3]->phydev->link = (cfg & 0x1);
+		switch_port_tab[3]->phydev->duplex = ((cfg >> 4) & 0x1);
+		if (((cfg >> 2) & 0x3) == 2)
+			switch_port_tab[3]->phydev->speed = 1000;
+		else if (((cfg >> 2) & 0x3) == 1)
+			switch_port_tab[3]->phydev->speed = 100;
+		else
+			switch_port_tab[3]->phydev->speed = 10;
+		cns3xxx_adjust_link(switch_port_tab[3]->netdev);
+	}
+
+	return (IRQ_HANDLED);
+}
+
+
+static void cns3xxx_alloc_rx_buf(struct sw *sw, int received)
+{
+	struct _rx_ring *rx_ring = &sw->rx_ring;
+	unsigned int i = rx_ring->alloc_index;
+	struct rx_desc *desc = &(rx_ring)->desc[i];
+	void *buf;
+	unsigned int phys;
+
+	for (received += rx_ring->alloc_count; received > 0; received--) {
+		buf = kmalloc(RX_SEGMENT_ALLOC_SIZE, GFP_ATOMIC);
+		if (!buf)
+			break;
+
+		phys = dma_map_single(sw->dev, buf + SKB_HEAD_ALIGN,
+				      RX_SEGMENT_MRU, DMA_FROM_DEVICE);
+		if (dma_mapping_error(sw->dev, phys)) {
+			kfree(buf);
+			break;
+		}
+
+		desc->sdl = RX_SEGMENT_MRU;
+		desc->sdp = phys;
+
+		wmb();
+
+		/* put the new buffer on RX-free queue */
+		rx_ring->buff_tab[i] = buf;
+		rx_ring->phys_tab[i] = phys;
+		if (i == RX_DESCS - 1) {
+			i = 0;
+			desc->config0 = END_OF_RING | FIRST_SEGMENT |
+					LAST_SEGMENT | RX_SEGMENT_MRU;
+			desc = &(rx_ring)->desc[i];
+		} else {
+			desc->config0 = FIRST_SEGMENT | LAST_SEGMENT |
+					RX_SEGMENT_MRU;
+			i++;
+			desc++;
+		}
+	}
+
+	rx_ring->alloc_count = received;
+	rx_ring->alloc_index = i;
+}
+
+static void eth_check_num_used(struct _tx_ring *tx_ring)
+{
+	bool stop = false;
+	int i;
+
+	if (tx_ring->num_used >= TX_DESCS - TX_DESC_RESERVE)
+		stop = true;
+
+	if (tx_ring->stopped == stop)
+		return;
+
+	tx_ring->stopped = stop;
+	for (i = 0; i < 4; i++) {
+		struct port *port = switch_port_tab[i];
+		struct net_device *dev;
+
+		if (!port)
+			continue;
+
+		dev = port->netdev;
+		if (stop)
+			netif_stop_queue(dev);
+		else
+			netif_wake_queue(dev);
+	}
+}
+
+static void eth_complete_tx(struct sw *sw)
+{
+	struct _tx_ring *tx_ring = &sw->tx_ring;
+	struct tx_desc *desc;
+	int i;
+	int index;
+	int num_used = tx_ring->num_used;
+	struct sk_buff *skb;
+
+	index = tx_ring->free_index;
+	desc = &(tx_ring)->desc[index];
+	for (i = 0; i < num_used; i++) {
+		if (desc->cown) {
+			skb = tx_ring->buff_tab[index];
+			tx_ring->buff_tab[index] = 0;
+			if (skb)
+				dev_kfree_skb_any(skb);
+			dma_unmap_single(sw->dev, tx_ring->phys_tab[index],
+				desc->sdl, DMA_TO_DEVICE);
+			if (++index == TX_DESCS) {
+				index = 0;
+				desc = &(tx_ring)->desc[index];
+			} else {
+				desc++;
+			}
+		} else {
+			break;
+		}
+	}
+	tx_ring->free_index = index;
+	tx_ring->num_used -= i;
+	eth_check_num_used(tx_ring);
+}
+
+static int eth_poll(struct napi_struct *napi, int budget)
+{
+	struct sw *sw = container_of(napi, struct sw, napi);
+	struct _rx_ring *rx_ring = &sw->rx_ring;
+	int received = 0;
+	unsigned int length;
+	unsigned int i = rx_ring->cur_index;
+	struct rx_desc *desc = &(rx_ring)->desc[i];
+	unsigned int alloc_count = rx_ring->alloc_count;
+
+	while (desc->cown && alloc_count + received < RX_DESCS - 1) {
+		struct sk_buff *skb;
+		int reserve = SKB_HEAD_ALIGN;
+
+		if (received >= budget)
+			break;
+
+		/* process received frame */
+		dma_unmap_single(sw->dev, rx_ring->phys_tab[i],
+				 RX_SEGMENT_MRU, DMA_FROM_DEVICE);
+
+		skb = build_skb(rx_ring->buff_tab[i], 0);
+		if (!skb)
+			break;
+
+		skb->dev = switch_port_tab[desc->sp]->netdev;
+
+		length = desc->sdl;
+		if (desc->fsd && !desc->lsd)
+			length = RX_SEGMENT_MRU;
+
+		if (!desc->fsd) {
+			reserve -= NET_IP_ALIGN;
+			if (!desc->lsd)
+				length += NET_IP_ALIGN;
+		}
+
+		skb_reserve(skb, reserve);
+		skb_put(skb, length);
+
+		if (!sw->frag_first)
+			sw->frag_first = skb;
+		else {
+			if (sw->frag_first == sw->frag_last)
+				skb_frag_add_head(sw->frag_first, skb);
+			else
+				sw->frag_last->next = skb;
+			sw->frag_first->len += skb->len;
+			sw->frag_first->data_len += skb->len;
+			sw->frag_first->truesize += skb->truesize;
+		}
+		sw->frag_last = skb;
+
+		if (desc->lsd) {
+			struct net_device *dev;
+
+			skb = sw->frag_first;
+			dev = skb->dev;
+			skb->protocol = eth_type_trans(skb, dev);
+
+			dev->stats.rx_packets++;
+			dev->stats.rx_bytes += skb->len;
+
+			/* RX Hardware checksum offload */
+			skb->ip_summed = CHECKSUM_NONE;
+			switch (desc->prot) {
+				case 1:
+				case 2:
+				case 5:
+				case 6:
+				case 13:
+				case 14:
+					if (!desc->l4f) {
+						skb->ip_summed = CHECKSUM_UNNECESSARY;
+						napi_gro_receive(napi, skb);
+						break;
+					}
+					/* fall through */
+				default:
+					netif_receive_skb(skb);
+					break;
+			}
+
+			sw->frag_first = NULL;
+			sw->frag_last = NULL;
+		}
+
+		received++;
+		if (++i == RX_DESCS) {
+			i = 0;
+			desc = &(rx_ring)->desc[i];
+		} else {
+			desc++;
+		}
+	}
+
+	rx_ring->cur_index = i;
+	if (!received) {
+		napi_complete(napi);
+		enable_irq(sw->rx_irq);
+
+		/* if rx descriptors are full schedule another poll */
+		if (rx_ring->desc[(i-1) & (RX_DESCS-1)].cown)
+			eth_schedule_poll(sw);
+	}
+
+	spin_lock_bh(&tx_lock);
+	eth_complete_tx(sw);
+	spin_unlock_bh(&tx_lock);
+
+	cns3xxx_alloc_rx_buf(sw, received);
+
+	wmb();
+	enable_rx_dma(sw);
+
+	return received;
+}
+
+static void eth_set_desc(struct sw *sw, struct _tx_ring *tx_ring, int index,
+			 int index_last, void *data, int len, u32 config0,
+			 u32 pmap)
+{
+	struct tx_desc *tx_desc = &(tx_ring)->desc[index];
+	unsigned int phys;
+
+	phys = dma_map_single(sw->dev, data, len, DMA_TO_DEVICE);
+	tx_desc->sdp = phys;
+	tx_desc->pmap = pmap;
+	tx_ring->phys_tab[index] = phys;
+
+	config0 |= len;
+	if (index == TX_DESCS - 1)
+		config0 |= END_OF_RING;
+	if (index == index_last)
+		config0 |= LAST_SEGMENT;
+
+	wmb();
+	tx_desc->config0 = config0;
+}
+
+static int eth_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct port *port = netdev_priv(dev);
+	struct sw *sw = port->sw;
+	struct _tx_ring *tx_ring = &sw->tx_ring;
+	struct sk_buff *skb1;
+	char pmap = (1 << port->id);
+	int nr_frags = skb_shinfo(skb)->nr_frags;
+	int nr_desc = nr_frags;
+	int index0, index, index_last;
+	int len0;
+	unsigned int i;
+	u32 config0;
+
+	if (pmap == 8)
+		pmap = (1 << 4);
+
+	skb_walk_frags(skb, skb1)
+		nr_desc++;
+
+	eth_schedule_poll(sw);
+	spin_lock_bh(&tx_lock);
+	if ((tx_ring->num_used + nr_desc + 1) >= TX_DESCS) {
+		spin_unlock_bh(&tx_lock);
+		return NETDEV_TX_BUSY;
+	}
+
+	index = index0 = tx_ring->cur_index;
+	index_last = (index0 + nr_desc) % TX_DESCS;
+	tx_ring->cur_index = (index_last + 1) % TX_DESCS;
+
+	spin_unlock_bh(&tx_lock);
+
+	config0 = FORCE_ROUTE;
+	if (skb->ip_summed == CHECKSUM_PARTIAL)
+		config0 |= UDP_CHECKSUM | TCP_CHECKSUM;
+
+	len0 = skb->len;
+
+	/* fragments */
+	for (i = 0; i < nr_frags; i++) {
+		struct skb_frag_struct *frag;
+		void *addr;
+
+		index = (index + 1) % TX_DESCS;
+
+		frag = &skb_shinfo(skb)->frags[i];
+		addr = page_address(skb_frag_page(frag)) + frag->page_offset;
+
+		eth_set_desc(sw, tx_ring, index, index_last, addr, frag->size,
+			     config0, pmap);
+	}
+
+	if (nr_frags)
+		len0 = skb->len - skb->data_len;
+
+	skb_walk_frags(skb, skb1) {
+		index = (index + 1) % TX_DESCS;
+		len0 -= skb1->len;
+
+		eth_set_desc(sw, tx_ring, index, index_last, skb1->data,
+			     skb1->len, config0, pmap);
+	}
+
+	tx_ring->buff_tab[index0] = skb;
+	eth_set_desc(sw, tx_ring, index0, index_last, skb->data, len0,
+		     config0 | FIRST_SEGMENT, pmap);
+
+	wmb();
+
+	spin_lock(&tx_lock);
+	tx_ring->num_used += nr_desc + 1;
+	spin_unlock(&tx_lock);
+
+	dev->stats.tx_packets++;
+	dev->stats.tx_bytes += skb->len;
+
+	enable_tx_dma(sw);
+
+	return NETDEV_TX_OK;
+}
+
+static int eth_ioctl(struct net_device *dev, struct ifreq *req, int cmd)
+{
+	struct port *port = netdev_priv(dev);
+
+	if (!netif_running(dev))
+		return -EINVAL;
+	return phy_mii_ioctl(port->phydev, req, cmd);
+}
+
+/* ethtool support */
+
+static void cns3xxx_get_drvinfo(struct net_device *dev,
+			       struct ethtool_drvinfo *info)
+{
+	strcpy(info->driver, DRV_NAME);
+	strcpy(info->bus_info, "internal");
+}
+
+static int cns3xxx_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+	struct port *port = netdev_priv(dev);
+	return phy_ethtool_gset(port->phydev, cmd);
+}
+
+static int cns3xxx_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+	struct port *port = netdev_priv(dev);
+	return phy_ethtool_sset(port->phydev, cmd);
+}
+
+static int cns3xxx_nway_reset(struct net_device *dev)
+{
+	struct port *port = netdev_priv(dev);
+	return phy_start_aneg(port->phydev);
+}
+
+static struct ethtool_ops cns3xxx_ethtool_ops = {
+	.get_drvinfo = cns3xxx_get_drvinfo,
+	.get_settings = cns3xxx_get_settings,
+	.set_settings = cns3xxx_set_settings,
+	.nway_reset = cns3xxx_nway_reset,
+	.get_link = ethtool_op_get_link,
+};
+
+
+static int init_rings(struct sw *sw)
+{
+	int i;
+	struct _rx_ring *rx_ring = &sw->rx_ring;
+	struct _tx_ring *tx_ring = &sw->tx_ring;
+
+	__raw_writel(0, &sw->regs->fs_dma_ctrl0);
+	__raw_writel(TS_SUSPEND | FS_SUSPEND, &sw->regs->dma_auto_poll_cfg);
+	__raw_writel(QUEUE_THRESHOLD, &sw->regs->dma_ring_ctrl);
+	__raw_writel(CLR_FS_STATE | QUEUE_THRESHOLD, &sw->regs->dma_ring_ctrl);
+
+	__raw_writel(QUEUE_THRESHOLD, &sw->regs->dma_ring_ctrl);
+
+	if (!(rx_dma_pool = dma_pool_create(DRV_NAME, sw->dev,
+					    RX_POOL_ALLOC_SIZE, 32, 0)))
+		return -ENOMEM;
+
+	if (!(rx_ring->desc = dma_pool_alloc(rx_dma_pool, GFP_KERNEL,
+					      &rx_ring->phys_addr)))
+		return -ENOMEM;
+	memset(rx_ring->desc, 0, RX_POOL_ALLOC_SIZE);
+
+	/* Setup RX buffers */
+	for (i = 0; i < RX_DESCS; i++) {
+		struct rx_desc *desc = &(rx_ring)->desc[i];
+		void *buf;
+
+		buf = kzalloc(RX_SEGMENT_ALLOC_SIZE, GFP_KERNEL);
+		if (!buf)
+			return -ENOMEM;
+
+		desc->sdl = RX_SEGMENT_MRU;
+		if (i == (RX_DESCS - 1))
+			desc->eor = 1;
+		desc->fsd = 1;
+		desc->lsd = 1;
+
+		desc->sdp = dma_map_single(sw->dev, buf + SKB_HEAD_ALIGN,
+					   RX_SEGMENT_MRU, DMA_FROM_DEVICE);
+		if (dma_mapping_error(sw->dev, desc->sdp))
+			return -EIO;
+
+		rx_ring->buff_tab[i] = buf;
+		rx_ring->phys_tab[i] = desc->sdp;
+		desc->cown = 0;
+	}
+	__raw_writel(rx_ring->phys_addr, &sw->regs->fs_desc_ptr0);
+	__raw_writel(rx_ring->phys_addr, &sw->regs->fs_desc_base_addr0);
+
+	if (!(tx_dma_pool = dma_pool_create(DRV_NAME, sw->dev,
+					    TX_POOL_ALLOC_SIZE, 32, 0)))
+		return -ENOMEM;
+
+	if (!(tx_ring->desc = dma_pool_alloc(tx_dma_pool, GFP_KERNEL,
+					      &tx_ring->phys_addr)))
+		return -ENOMEM;
+	memset(tx_ring->desc, 0, TX_POOL_ALLOC_SIZE);
+
+	/* Setup TX buffers */
+	for (i = 0; i < TX_DESCS; i++) {
+		struct tx_desc *desc = &(tx_ring)->desc[i];
+		tx_ring->buff_tab[i] = 0;
+
+		if (i == (TX_DESCS - 1))
+			desc->eor = 1;
+		desc->cown = 1;
+	}
+	__raw_writel(tx_ring->phys_addr, &sw->regs->ts_desc_ptr0);
+	__raw_writel(tx_ring->phys_addr, &sw->regs->ts_desc_base_addr0);
+
+	return 0;
+}
+
+static void destroy_rings(struct sw *sw)
+{
+	int i;
+	if (sw->rx_ring.desc) {
+		for (i = 0; i < RX_DESCS; i++) {
+			struct _rx_ring *rx_ring = &sw->rx_ring;
+			struct rx_desc *desc = &(rx_ring)->desc[i];
+			struct sk_buff *skb = sw->rx_ring.buff_tab[i];
+
+			if (!skb)
+				continue;
+
+			dma_unmap_single(sw->dev, desc->sdp, RX_SEGMENT_MRU,
+					 DMA_FROM_DEVICE);
+			dev_kfree_skb(skb);
+		}
+		dma_pool_free(rx_dma_pool, sw->rx_ring.desc, sw->rx_ring.phys_addr);
+		dma_pool_destroy(rx_dma_pool);
+		rx_dma_pool = 0;
+		sw->rx_ring.desc = 0;
+	}
+	if (sw->tx_ring.desc) {
+		for (i = 0; i < TX_DESCS; i++) {
+			struct _tx_ring *tx_ring = &sw->tx_ring;
+			struct tx_desc *desc = &(tx_ring)->desc[i];
+			struct sk_buff *skb = sw->tx_ring.buff_tab[i];
+			if (skb) {
+				dma_unmap_single(sw->dev, desc->sdp,
+					skb->len, DMA_TO_DEVICE);
+				dev_kfree_skb(skb);
+			}
+		}
+		dma_pool_free(tx_dma_pool, sw->tx_ring.desc, sw->tx_ring.phys_addr);
+		dma_pool_destroy(tx_dma_pool);
+		tx_dma_pool = 0;
+		sw->tx_ring.desc = 0;
+	}
+}
+
+static int eth_open(struct net_device *dev)
+{
+	struct port *port = netdev_priv(dev);
+	struct sw *sw = port->sw;
+	u32 temp;
+
+	port->speed = 0;	/* force "link up" message */
+	phy_start(port->phydev);
+
+	netif_start_queue(dev);
+
+	if (!ports_open) {
+		request_irq(sw->rx_irq, eth_rx_irq, IRQF_SHARED, "gig_switch", napi_dev);
+		request_irq(sw->stat_irq, eth_stat_irq, IRQF_SHARED, "gig_stat", napi_dev);
+		napi_enable(&sw->napi);
+		netif_start_queue(napi_dev);
+
+ 		__raw_writel(~(MAC0_STATUS_CHANGE | MAC1_STATUS_CHANGE | MAC2_STATUS_CHANGE |
+ 			       MAC0_RX_ERROR | MAC1_RX_ERROR | MAC2_RX_ERROR), &sw->regs->intr_mask);
+
+		temp = __raw_readl(&sw->regs->mac_cfg[2]);
+		temp &= ~(PORT_DISABLE);
+		__raw_writel(temp, &sw->regs->mac_cfg[2]);
+
+		temp = __raw_readl(&sw->regs->dma_auto_poll_cfg);
+		temp &= ~(TS_SUSPEND | FS_SUSPEND);
+		__raw_writel(temp, &sw->regs->dma_auto_poll_cfg);
+
+		enable_rx_dma(sw);
+	}
+	temp = __raw_readl(&sw->regs->mac_cfg[port->id]);
+	temp &= ~(PORT_DISABLE);
+	__raw_writel(temp, &sw->regs->mac_cfg[port->id]);
+
+	ports_open++;
+	netif_carrier_on(dev);
+
+	return 0;
+}
+
+static int eth_close(struct net_device *dev)
+{
+	struct port *port = netdev_priv(dev);
+	struct sw *sw = port->sw;
+	u32 temp;
+
+	ports_open--;
+
+	temp = __raw_readl(&sw->regs->mac_cfg[port->id]);
+	temp |= (PORT_DISABLE);
+	__raw_writel(temp, &sw->regs->mac_cfg[port->id]);
+
+	netif_stop_queue(dev);
+
+	phy_stop(port->phydev);
+
+	if (!ports_open) {
+		disable_irq(sw->rx_irq);
+		free_irq(sw->rx_irq, napi_dev);
+		disable_irq(sw->stat_irq);
+		free_irq(sw->stat_irq, napi_dev);
+		napi_disable(&sw->napi);
+		netif_stop_queue(napi_dev);
+		temp = __raw_readl(&sw->regs->mac_cfg[2]);
+		temp |= (PORT_DISABLE);
+		__raw_writel(temp, &sw->regs->mac_cfg[2]);
+
+		__raw_writel(TS_SUSPEND | FS_SUSPEND,
+			     &sw->regs->dma_auto_poll_cfg);
+	}
+
+	netif_carrier_off(dev);
+	return 0;
+}
+
+static void eth_rx_mode(struct net_device *dev)
+{
+	struct port *port = netdev_priv(dev);
+	struct sw *sw = port->sw;
+	u32 temp;
+
+	temp = __raw_readl(&sw->regs->mac_glob_cfg);
+
+	if (dev->flags & IFF_PROMISC) {
+		if (port->id == 3)
+			temp |= ((1 << 2) << PROMISC_OFFSET);
+		else
+			temp |= ((1 << port->id) << PROMISC_OFFSET);
+	} else {
+		if (port->id == 3)
+			temp &= ~((1 << 2) << PROMISC_OFFSET);
+		else
+			temp &= ~((1 << port->id) << PROMISC_OFFSET);
+	}
+	__raw_writel(temp, &sw->regs->mac_glob_cfg);
+}
+
+static int eth_set_mac(struct net_device *netdev, void *p)
+{
+	struct port *port = netdev_priv(netdev);
+	struct sw *sw = port->sw;
+	struct sockaddr *addr = p;
+	u32 cycles = 0;
+
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EADDRNOTAVAIL;
+
+	/* Invalidate old ARL Entry */
+	if (port->id == 3)
+		__raw_writel((port->id << 16) | (0x4 << 9), &sw->regs->arl_ctrl[0]);
+	else
+		__raw_writel(((port->id + 1) << 16) | (0x4 << 9), &sw->regs->arl_ctrl[0]);
+	__raw_writel( ((netdev->dev_addr[0] << 24) | (netdev->dev_addr[1] << 16) |
+			(netdev->dev_addr[2] << 8) | (netdev->dev_addr[3])),
+			&sw->regs->arl_ctrl[1]);
+
+	__raw_writel( ((netdev->dev_addr[4] << 24) | (netdev->dev_addr[5] << 16) |
+			(1 << 1)),
+			&sw->regs->arl_ctrl[2]);
+	__raw_writel((1 << 19), &sw->regs->arl_vlan_cmd);
+
+	while (((__raw_readl(&sw->regs->arl_vlan_cmd) & (1 << 21)) == 0)
+			&& cycles < 5000) {
+		udelay(1);
+		cycles++;
+	}
+
+	cycles = 0;
+	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
+
+	if (port->id == 3)
+		__raw_writel((port->id << 16) | (0x4 << 9), &sw->regs->arl_ctrl[0]);
+	else
+		__raw_writel(((port->id + 1) << 16) | (0x4 << 9), &sw->regs->arl_ctrl[0]);
+	__raw_writel( ((addr->sa_data[0] << 24) | (addr->sa_data[1] << 16) |
+			(addr->sa_data[2] << 8) | (addr->sa_data[3])),
+			&sw->regs->arl_ctrl[1]);
+
+	__raw_writel( ((addr->sa_data[4] << 24) | (addr->sa_data[5] << 16) |
+			(7 << 4) | (1 << 1)), &sw->regs->arl_ctrl[2]);
+	__raw_writel((1 << 19), &sw->regs->arl_vlan_cmd);
+
+	while (((__raw_readl(&sw->regs->arl_vlan_cmd) & (1 << 21)) == 0)
+		&& cycles < 5000) {
+		udelay(1);
+		cycles++;
+	}
+	return 0;
+}
+
+static int cns3xxx_change_mtu(struct net_device *dev, int new_mtu)
+{
+	if (new_mtu > MAX_MTU)
+		return -EINVAL;
+
+	dev->mtu = new_mtu;
+	return 0;
+}
+
+static const struct net_device_ops cns3xxx_netdev_ops = {
+	.ndo_open = eth_open,
+	.ndo_stop = eth_close,
+	.ndo_start_xmit = eth_xmit,
+	.ndo_set_rx_mode = eth_rx_mode,
+	.ndo_do_ioctl = eth_ioctl,
+	.ndo_change_mtu = cns3xxx_change_mtu,
+	.ndo_set_mac_address = eth_set_mac,
+	.ndo_validate_addr = eth_validate_addr,
+};
+
+static int eth_init_one(struct platform_device *pdev)
+{
+	int i;
+	struct port *port;
+	struct sw *sw;
+	struct net_device *dev;
+	struct cns3xxx_plat_info *plat = pdev->dev.platform_data;
+	char phy_id[MII_BUS_ID_SIZE + 3];
+	int err;
+	u32 temp;
+	struct resource *res;
+	void __iomem *regs;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
+
+	err = cns3xxx_mdio_register(regs);
+	if (err)
+		return err;
+
+	if (!(napi_dev = alloc_etherdev(sizeof(struct sw)))) {
+		err = -ENOMEM;
+		goto err_remove_mdio;
+	}
+
+	strcpy(napi_dev->name, "switch%d");
+	napi_dev->features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_FRAGLIST;
+
+	SET_NETDEV_DEV(napi_dev, &pdev->dev);
+	sw = netdev_priv(napi_dev);
+	memset(sw, 0, sizeof(struct sw));
+	sw->regs = regs;
+	sw->dev = &pdev->dev;
+
+	sw->rx_irq = platform_get_irq_byname(pdev, "eth_rx");
+	sw->stat_irq = platform_get_irq_byname(pdev, "eth_stat");
+
+	temp = __raw_readl(&sw->regs->phy_auto_addr);
+	temp |= (3 << 30); /* maximum frame length: 9600 bytes */
+	__raw_writel(temp, &sw->regs->phy_auto_addr);
+
+	for (i = 0; i < 4; i++) {
+		temp = __raw_readl(&sw->regs->mac_cfg[i]);
+		temp |= (PORT_DISABLE);
+		__raw_writel(temp, &sw->regs->mac_cfg[i]);
+	}
+
+	temp = PORT_DISABLE;
+	__raw_writel(temp, &sw->regs->mac_cfg[2]);
+
+	temp = __raw_readl(&sw->regs->vlan_cfg);
+	temp |= NIC_MODE | VLAN_UNAWARE;
+	__raw_writel(temp, &sw->regs->vlan_cfg);
+
+	__raw_writel(UNKNOWN_VLAN_TO_CPU |
+		     CRC_STRIPPING, &sw->regs->mac_glob_cfg);
+
+	if ((err = init_rings(sw)) != 0) {
+		destroy_rings(sw);
+		err = -ENOMEM;
+		goto err_free;
+	}
+	platform_set_drvdata(pdev, napi_dev);
+
+	netif_napi_add(napi_dev, &sw->napi, eth_poll, NAPI_WEIGHT);
+
+	for (i = 0; i < 3; i++) {
+		if (!(plat->ports & (1 << i))) {
+			continue;
+		}
+
+		if (!(dev = alloc_etherdev(sizeof(struct port)))) {
+			goto free_ports;
+		}
+
+		port = netdev_priv(dev);
+		port->netdev = dev;
+		if (i == 2)
+			port->id = 3;
+		else
+			port->id = i;
+		port->sw = sw;
+
+		temp = __raw_readl(&sw->regs->mac_cfg[port->id]);
+		temp |= (PORT_DISABLE | PORT_BLOCK_STATE | PORT_LEARN_DIS);
+		__raw_writel(temp, &sw->regs->mac_cfg[port->id]);
+
+		SET_NETDEV_DEV(dev, &pdev->dev);
+		dev->netdev_ops = &cns3xxx_netdev_ops;
+		dev->ethtool_ops = &cns3xxx_ethtool_ops;
+		dev->tx_queue_len = 1000;
+		dev->features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_FRAGLIST;
+
+		switch_port_tab[port->id] = port;
+		memcpy(dev->dev_addr, &plat->hwaddr[i], ETH_ALEN);
+
+		snprintf(phy_id, MII_BUS_ID_SIZE + 3, PHY_ID_FMT, "0", plat->phy[i]);
+		port->phydev = phy_connect(dev, phy_id, &cns3xxx_adjust_link,
+			PHY_INTERFACE_MODE_RGMII);
+		if ((err = IS_ERR(port->phydev))) {
+			switch_port_tab[port->id] = 0;
+			free_netdev(dev);
+			goto free_ports;
+		}
+
+		port->phydev->irq = PHY_IGNORE_INTERRUPT;
+
+		if ((err = register_netdev(dev))) {
+			phy_disconnect(port->phydev);
+			switch_port_tab[port->id] = 0;
+			free_netdev(dev);
+			goto free_ports;
+		}
+
+		printk(KERN_INFO "%s: RGMII PHY %i on cns3xxx Switch\n", dev->name, plat->phy[i]);
+		netif_carrier_off(dev);
+		dev = 0;
+	}
+
+	return 0;
+
+free_ports:
+	err = -ENOMEM;
+	for (--i; i >= 0; i--) {
+		if (switch_port_tab[i]) {
+			port = switch_port_tab[i];
+			dev = port->netdev;
+			unregister_netdev(dev);
+			phy_disconnect(port->phydev);
+			switch_port_tab[i] = 0;
+			free_netdev(dev);
+		}
+	}
+err_free:
+	free_netdev(napi_dev);
+err_remove_mdio:
+	cns3xxx_mdio_remove();
+	return err;
+}
+
+static int eth_remove_one(struct platform_device *pdev)
+{
+	struct net_device *dev = platform_get_drvdata(pdev);
+	struct sw *sw = netdev_priv(dev);
+	int i;
+	destroy_rings(sw);
+
+	for (i = 3; i >= 0; i--) {
+		if (switch_port_tab[i]) {
+			struct port *port = switch_port_tab[i];
+			struct net_device *dev = port->netdev;
+			unregister_netdev(dev);
+			phy_disconnect(port->phydev);
+			switch_port_tab[i] = 0;
+			free_netdev(dev);
+		}
+	}
+
+	free_netdev(napi_dev);
+	cns3xxx_mdio_remove();
+
+	return 0;
+}
+
+static struct platform_driver cns3xxx_eth_driver = {
+	.driver.name	= DRV_NAME,
+	.probe		= eth_init_one,
+	.remove		= eth_remove_one,
+};
+
+static int __init eth_init_module(void)
+{
+	return platform_driver_register(&cns3xxx_eth_driver);
+}
+
+static void __exit eth_cleanup_module(void)
+{
+	platform_driver_unregister(&cns3xxx_eth_driver);
+}
+
+module_init(eth_init_module);
+module_exit(eth_cleanup_module);
+
+MODULE_AUTHOR("Chris Lang");
+MODULE_DESCRIPTION("Cavium CNS3xxx Ethernet driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:cns3xxx_eth");