net: add Fast Ethernet driver for PXA168.

Signed-off-by: Sachin Sanap <ssanap@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 1677 insertions, 0 deletions

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index ebe68395ecf8..fe581566cb26 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -928,6 +928,16 @@ config SMC91X
           The module will be called smc91x.  If you want to compile it as a
           module, say M here and read <file:Documentation/kbuild/modules.txt>.
 
+config PXA168_ETH
+        tristate "Marvell pxa168 ethernet support"
+        depends on CPU_PXA168
+        select PHYLIB
+        help
+          This driver supports the pxa168 Ethernet ports.
+
+          To compile this driver as a module, choose M here. The module
+          will be called pxa168_eth.
+
 config NET_NETX
         tristate "NetX Ethernet support"
         select MII
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 56e8c27f77ce..3e8f150c4b14 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -244,6 +244,7 @@ obj-$(CONFIG_MYRI10GE) += myri10ge/
 obj-$(CONFIG_SMC91X) += smc91x.o
 obj-$(CONFIG_SMC911X) += smc911x.o
 obj-$(CONFIG_SMSC911X) += smsc911x.o
+obj-$(CONFIG_PXA168_ETH) += pxa168_eth.o
 obj-$(CONFIG_BFIN_MAC) += bfin_mac.o
 obj-$(CONFIG_DM9000) += dm9000.o
 obj-$(CONFIG_PASEMI_MAC) += pasemi_mac_driver.o
diff --git a/drivers/net/pxa168_eth.c b/drivers/net/pxa168_eth.c
new file mode 100644
index 000000000000..ecc64d750cce
--- /dev/null
+++ b/drivers/net/pxa168_eth.c
@@ -0,0 +1,1666 @@
+/*
+ * PXA168 ethernet driver.
+ * Most of the code is derived from mv643xx ethernet driver.
+ *
+ * Copyright (C) 2010 Marvell International Ltd.
+ *              Sachin Sanap <ssanap@marvell.com>
+ *              Philip Rakity <prakity@marvell.com>
+ *              Mark Brown <markb@marvell.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/dma-mapping.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/etherdevice.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/ethtool.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/workqueue.h>
+#include <linux/clk.h>
+#include <linux/phy.h>
+#include <linux/io.h>
+#include <linux/types.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <asm/cacheflush.h>
+#include <linux/pxa168_eth.h>
+
+#define DRIVER_NAME     "pxa168-eth"
+#define DRIVER_VERSION  "0.3"
+
+/*
+ * Registers
+ */
+
+#define PHY_ADDRESS             0x0000
+#define SMI                     0x0010
+#define PORT_CONFIG             0x0400
+#define PORT_CONFIG_EXT         0x0408
+#define PORT_COMMAND            0x0410
+#define PORT_STATUS             0x0418
+#define HTPR                    0x0428
+#define SDMA_CONFIG             0x0440
+#define SDMA_CMD                0x0448
+#define INT_CAUSE               0x0450
+#define INT_W_CLEAR             0x0454
+#define INT_MASK                0x0458
+#define ETH_F_RX_DESC_0         0x0480
+#define ETH_C_RX_DESC_0         0x04A0
+#define ETH_C_TX_DESC_1         0x04E4
+
+/* smi register */
+#define SMI_BUSY                (1 << 28)       /* 0 - Write, 1 - Read  */
+#define SMI_R_VALID             (1 << 27)       /* 0 - Write, 1 - Read  */
+#define SMI_OP_W                (0 << 26)       /* Write operation      */
+#define SMI_OP_R                (1 << 26)       /* Read operation */
+
+#define PHY_WAIT_ITERATIONS     10
+
+#define PXA168_ETH_PHY_ADDR_DEFAULT     0
+/* RX & TX descriptor command */
+#define BUF_OWNED_BY_DMA        (1 << 31)
+
+/* RX descriptor status */
+#define RX_EN_INT               (1 << 23)
+#define RX_FIRST_DESC           (1 << 17)
+#define RX_LAST_DESC            (1 << 16)
+#define RX_ERROR                (1 << 15)
+
+/* TX descriptor command */
+#define TX_EN_INT               (1 << 23)
+#define TX_GEN_CRC              (1 << 22)
+#define TX_ZERO_PADDING         (1 << 18)
+#define TX_FIRST_DESC           (1 << 17)
+#define TX_LAST_DESC            (1 << 16)
+#define TX_ERROR                (1 << 15)
+
+/* SDMA_CMD */
+#define SDMA_CMD_AT             (1 << 31)
+#define SDMA_CMD_TXDL           (1 << 24)
+#define SDMA_CMD_TXDH           (1 << 23)
+#define SDMA_CMD_AR             (1 << 15)
+#define SDMA_CMD_ERD            (1 << 7)
+
+/* Bit definitions of the Port Config Reg */
+#define PCR_HS                  (1 << 12)
+#define PCR_EN                  (1 << 7)
+#define PCR_PM                  (1 << 0)
+
+/* Bit definitions of the Port Config Extend Reg */
+#define PCXR_2BSM               (1 << 28)
+#define PCXR_DSCP_EN            (1 << 21)
+#define PCXR_MFL_1518           (0 << 14)
+#define PCXR_MFL_1536           (1 << 14)
+#define PCXR_MFL_2048           (2 << 14)
+#define PCXR_MFL_64K            (3 << 14)
+#define PCXR_FLP                (1 << 11)
+#define PCXR_PRIO_TX_OFF        3
+#define PCXR_TX_HIGH_PRI        (7 << PCXR_PRIO_TX_OFF)
+
+/* Bit definitions of the SDMA Config Reg */
+#define SDCR_BSZ_OFF            12
+#define SDCR_BSZ8               (3 << SDCR_BSZ_OFF)
+#define SDCR_BSZ4               (2 << SDCR_BSZ_OFF)
+#define SDCR_BSZ2               (1 << SDCR_BSZ_OFF)
+#define SDCR_BSZ1               (0 << SDCR_BSZ_OFF)
+#define SDCR_BLMR               (1 << 6)
+#define SDCR_BLMT               (1 << 7)
+#define SDCR_RIFB               (1 << 9)
+#define SDCR_RC_OFF             2
+#define SDCR_RC_MAX_RETRANS     (0xf << SDCR_RC_OFF)
+
+/*
+ * Bit definitions of the Interrupt Cause Reg
+ * and Interrupt MASK Reg is the same
+ */
+#define ICR_RXBUF               (1 << 0)
+#define ICR_TXBUF_H             (1 << 2)
+#define ICR_TXBUF_L             (1 << 3)
+#define ICR_TXEND_H             (1 << 6)
+#define ICR_TXEND_L             (1 << 7)
+#define ICR_RXERR               (1 << 8)
+#define ICR_TXERR_H             (1 << 10)
+#define ICR_TXERR_L             (1 << 11)
+#define ICR_TX_UDR              (1 << 13)
+#define ICR_MII_CH              (1 << 28)
+
+#define ALL_INTS (ICR_TXBUF_H  | ICR_TXBUF_L  | ICR_TX_UDR |\
+                                ICR_TXERR_H  | ICR_TXERR_L |\
+                                ICR_TXEND_H  | ICR_TXEND_L |\
+                                ICR_RXBUF | ICR_RXERR  | ICR_MII_CH)
+
+#define ETH_HW_IP_ALIGN         2       /* hw aligns IP header */
+
+#define NUM_RX_DESCS            64
+#define NUM_TX_DESCS            64
+
+#define HASH_ADD                0
+#define HASH_DELETE             1
+#define HASH_ADDR_TABLE_SIZE    0x4000  /* 16K (1/2K address - PCR_HS == 1) */
+#define HOP_NUMBER              12
+
+/* Bit definitions for Port status */
+#define PORT_SPEED_100          (1 << 0)
+#define FULL_DUPLEX             (1 << 1)
+#define FLOW_CONTROL_ENABLED    (1 << 2)
+#define LINK_UP                 (1 << 3)
+
+/* Bit definitions for work to be done */
+#define WORK_LINK               (1 << 0)
+#define WORK_TX_DONE            (1 << 1)
+
+/*
+ * Misc definitions.
+ */
+#define SKB_DMA_REALIGN         ((PAGE_SIZE - NET_SKB_PAD) % SMP_CACHE_BYTES)
+
+struct rx_desc {
+        u32 cmd_sts;            /* Descriptor command status            */
+        u16 byte_cnt;           /* Descriptor buffer byte count         */
+        u16 buf_size;           /* Buffer size                          */
+        u32 buf_ptr;            /* Descriptor buffer pointer            */
+        u32 next_desc_ptr;      /* Next descriptor pointer              */
+};
+
+struct tx_desc {
+        u32 cmd_sts;            /* Command/status field                 */
+        u16 reserved;
+        u16 byte_cnt;           /* buffer byte count                    */
+        u32 buf_ptr;            /* pointer to buffer for this descriptor */
+        u32 next_desc_ptr;      /* Pointer to next descriptor           */
+};
+
+struct pxa168_eth_private {
+        int port_num;           /* User Ethernet port number    */
+
+        int rx_resource_err;    /* Rx ring resource error flag */
+
+        /* Next available and first returning Rx resource */
+        int rx_curr_desc_q, rx_used_desc_q;
+
+        /* Next available and first returning Tx resource */
+        int tx_curr_desc_q, tx_used_desc_q;
+
+        struct rx_desc *p_rx_desc_area;
+        dma_addr_t rx_desc_dma;
+        int rx_desc_area_size;
+        struct sk_buff **rx_skb;
+
+        struct tx_desc *p_tx_desc_area;
+        dma_addr_t tx_desc_dma;
+        int tx_desc_area_size;
+        struct sk_buff **tx_skb;
+
+        struct work_struct tx_timeout_task;
+
+        struct net_device *dev;
+        struct napi_struct napi;
+        u8 work_todo;
+        int skb_size;
+
+        struct net_device_stats stats;
+        /* Size of Tx Ring per queue */
+        int tx_ring_size;
+        /* Number of tx descriptors in use */
+        int tx_desc_count;
+        /* Size of Rx Ring per queue */
+        int rx_ring_size;
+        /* Number of rx descriptors in use */
+        int rx_desc_count;
+
+        /*
+         * Used in case RX Ring is empty, which can occur when
+         * system does not have resources (skb's)
+         */
+        struct timer_list timeout;
+        struct mii_bus *smi_bus;
+        struct phy_device *phy;
+
+        /* clock */
+        struct clk *clk;
+        struct pxa168_eth_platform_data *pd;
+        /*
+         * Ethernet controller base address.
+         */
+        void __iomem *base;
+
+        /* Pointer to the hardware address filter table */
+        void *htpr;
+        dma_addr_t htpr_dma;
+};
+
+struct addr_table_entry {
+        __le32 lo;
+        __le32 hi;
+};
+
+/* Bit fields of a Hash Table Entry */
+enum hash_table_entry {
+        HASH_ENTRY_VALID = 1,
+        SKIP = 2,
+        HASH_ENTRY_RECEIVE_DISCARD = 4,
+        HASH_ENTRY_RECEIVE_DISCARD_BIT = 2
+};
+
+static int pxa168_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
+static int pxa168_set_settings(struct net_device *dev, struct ethtool_cmd *cmd);
+static int pxa168_init_hw(struct pxa168_eth_private *pep);
+static void eth_port_reset(struct net_device *dev);
+static void eth_port_start(struct net_device *dev);
+static int pxa168_eth_open(struct net_device *dev);
+static int pxa168_eth_stop(struct net_device *dev);
+static int ethernet_phy_setup(struct net_device *dev);
+
+static inline u32 rdl(struct pxa168_eth_private *pep, int offset)
+{
+        return readl(pep->base + offset);
+}
+
+static inline void wrl(struct pxa168_eth_private *pep, int offset, u32 data)
+{
+        writel(data, pep->base + offset);
+}
+
+static void abort_dma(struct pxa168_eth_private *pep)
+{
+        int delay;
+        int max_retries = 40;
+
+        do {
+                wrl(pep, SDMA_CMD, SDMA_CMD_AR | SDMA_CMD_AT);
+                udelay(100);
+
+                delay = 10;
+                while ((rdl(pep, SDMA_CMD) & (SDMA_CMD_AR | SDMA_CMD_AT))
+                       && delay-- > 0) {
+                        udelay(10);
+                }
+        } while (max_retries-- > 0 && delay <= 0);
+
+        if (max_retries <= 0)
+                printk(KERN_ERR "%s : DMA Stuck\n", __func__);
+}
+
+static int ethernet_phy_get(struct pxa168_eth_private *pep)
+{
+        unsigned int reg_data;
+
+        reg_data = rdl(pep, PHY_ADDRESS);
+
+        return (reg_data >> (5 * pep->port_num)) & 0x1f;
+}
+
+static void ethernet_phy_set_addr(struct pxa168_eth_private *pep, int phy_addr)
+{
+        u32 reg_data;
+        int addr_shift = 5 * pep->port_num;
+
+        reg_data = rdl(pep, PHY_ADDRESS);
+        reg_data &= ~(0x1f << addr_shift);
+        reg_data |= (phy_addr & 0x1f) << addr_shift;
+        wrl(pep, PHY_ADDRESS, reg_data);
+}
+
+static void ethernet_phy_reset(struct pxa168_eth_private *pep)
+{
+        int data;
+
+        data = phy_read(pep->phy, MII_BMCR);
+        if (data < 0)
+                return;
+
+        data |= BMCR_RESET;
+        if (phy_write(pep->phy, MII_BMCR, data) < 0)
+                return;
+
+        do {
+                data = phy_read(pep->phy, MII_BMCR);
+        } while (data >= 0 && data & BMCR_RESET);
+}
+
+static void rxq_refill(struct net_device *dev)
+{
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+        struct sk_buff *skb;
+        struct rx_desc *p_used_rx_desc;
+        int used_rx_desc;
+
+        while (pep->rx_desc_count < pep->rx_ring_size) {
+                int size;
+
+                skb = dev_alloc_skb(pep->skb_size);
+                if (!skb)
+                        break;
+                if (SKB_DMA_REALIGN)
+                        skb_reserve(skb, SKB_DMA_REALIGN);
+                pep->rx_desc_count++;
+                /* Get 'used' Rx descriptor */
+                used_rx_desc = pep->rx_used_desc_q;
+                p_used_rx_desc = &pep->p_rx_desc_area[used_rx_desc];
+                size = skb->end - skb->data;
+                p_used_rx_desc->buf_ptr = dma_map_single(NULL,
+                                                         skb->data,
+                                                         size,
+                                                         DMA_FROM_DEVICE);
+                p_used_rx_desc->buf_size = size;
+                pep->rx_skb[used_rx_desc] = skb;
+
+                /* Return the descriptor to DMA ownership */
+                wmb();
+                p_used_rx_desc->cmd_sts = BUF_OWNED_BY_DMA | RX_EN_INT;
+                wmb();
+
+                /* Move the used descriptor pointer to the next descriptor */
+                pep->rx_used_desc_q = (used_rx_desc + 1) % pep->rx_ring_size;
+
+                /* Any Rx return cancels the Rx resource error status */
+                pep->rx_resource_err = 0;
+
+                skb_reserve(skb, ETH_HW_IP_ALIGN);
+        }
+
+        /*
+         * If RX ring is empty of SKB, set a timer to try allocating
+         * again at a later time.
+         */
+        if (pep->rx_desc_count == 0) {
+                pep->timeout.expires = jiffies + (HZ / 10);
+                add_timer(&pep->timeout);
+        }
+}
+
+static inline void rxq_refill_timer_wrapper(unsigned long data)
+{
+        struct pxa168_eth_private *pep = (void *)data;
+        napi_schedule(&pep->napi);
+}
+
+static inline u8 flip_8_bits(u8 x)
+{
+        return (((x) & 0x01) << 3) | (((x) & 0x02) << 1)
+            | (((x) & 0x04) >> 1) | (((x) & 0x08) >> 3)
+            | (((x) & 0x10) << 3) | (((x) & 0x20) << 1)
+            | (((x) & 0x40) >> 1) | (((x) & 0x80) >> 3);
+}
+
+static void nibble_swap_every_byte(unsigned char *mac_addr)
+{
+        int i;
+        for (i = 0; i < ETH_ALEN; i++) {
+                mac_addr[i] = ((mac_addr[i] & 0x0f) << 4) |
+                                ((mac_addr[i] & 0xf0) >> 4);
+        }
+}
+
+static void inverse_every_nibble(unsigned char *mac_addr)
+{
+        int i;
+        for (i = 0; i < ETH_ALEN; i++)
+                mac_addr[i] = flip_8_bits(mac_addr[i]);
+}
+
+/*
+ * ----------------------------------------------------------------------------
+ * This function will calculate the hash function of the address.
+ * Inputs
+ * mac_addr_orig    - MAC address.
+ * Outputs
+ * return the calculated entry.
+ */
+static u32 hash_function(unsigned char *mac_addr_orig)
+{
+        u32 hash_result;
+        u32 addr0;
+        u32 addr1;
+        u32 addr2;
+        u32 addr3;
+        unsigned char mac_addr[ETH_ALEN];
+
+        /* Make a copy of MAC address since we are going to performe bit
+         * operations on it
+         */
+        memcpy(mac_addr, mac_addr_orig, ETH_ALEN);
+
+        nibble_swap_every_byte(mac_addr);
+        inverse_every_nibble(mac_addr);
+
+        addr0 = (mac_addr[5] >> 2) & 0x3f;
+        addr1 = (mac_addr[5] & 0x03) | (((mac_addr[4] & 0x7f)) << 2);
+        addr2 = ((mac_addr[4] & 0x80) >> 7) | mac_addr[3] << 1;
+        addr3 = (mac_addr[2] & 0xff) | ((mac_addr[1] & 1) << 8);
+
+        hash_result = (addr0 << 9) | (addr1 ^ addr2 ^ addr3);
+        hash_result = hash_result & 0x07ff;
+        return hash_result;
+}
+
+/*
+ * ----------------------------------------------------------------------------
+ * This function will add/del an entry to the address table.
+ * Inputs
+ * pep - ETHERNET .
+ * mac_addr - MAC address.
+ * skip - if 1, skip this address.Used in case of deleting an entry which is a
+ *        part of chain in the hash table.We cant just delete the entry since
+ *        that will break the chain.We need to defragment the tables time to
+ *        time.
+ * rd   - 0 Discard packet upon match.
+ *      - 1 Receive packet upon match.
+ * Outputs
+ * address table entry is added/deleted.
+ * 0 if success.
+ * -ENOSPC if table full
+ */
+static int add_del_hash_entry(struct pxa168_eth_private *pep,
+                              unsigned char *mac_addr,
+                              u32 rd, u32 skip, int del)
+{
+        struct addr_table_entry *entry, *start;
+        u32 new_high;
+        u32 new_low;
+        u32 i;
+
+        new_low = (((mac_addr[1] >> 4) & 0xf) << 15)
+            | (((mac_addr[1] >> 0) & 0xf) << 11)
+            | (((mac_addr[0] >> 4) & 0xf) << 7)
+            | (((mac_addr[0] >> 0) & 0xf) << 3)
+            | (((mac_addr[3] >> 4) & 0x1) << 31)
+            | (((mac_addr[3] >> 0) & 0xf) << 27)
+            | (((mac_addr[2] >> 4) & 0xf) << 23)
+            | (((mac_addr[2] >> 0) & 0xf) << 19)
+            | (skip << SKIP) | (rd << HASH_ENTRY_RECEIVE_DISCARD_BIT)
+            | HASH_ENTRY_VALID;
+
+        new_high = (((mac_addr[5] >> 4) & 0xf) << 15)
+            | (((mac_addr[5] >> 0) & 0xf) << 11)
+            | (((mac_addr[4] >> 4) & 0xf) << 7)
+            | (((mac_addr[4] >> 0) & 0xf) << 3)
+            | (((mac_addr[3] >> 5) & 0x7) << 0);
+
+        /*
+         * Pick the appropriate table, start scanning for free/reusable
+         * entries at the index obtained by hashing the specified MAC address
+         */
+        start = (struct addr_table_entry *)(pep->htpr);
+        entry = start + hash_function(mac_addr);
+        for (i = 0; i < HOP_NUMBER; i++) {
+                if (!(le32_to_cpu(entry->lo) & HASH_ENTRY_VALID)) {
+                        break;
+                } else {
+                        /* if same address put in same position */
+                        if (((le32_to_cpu(entry->lo) & 0xfffffff8) ==
+                                (new_low & 0xfffffff8)) &&
+                                (le32_to_cpu(entry->hi) == new_high)) {
+                                break;
+                        }
+                }
+                if (entry == start + 0x7ff)
+                        entry = start;
+                else
+                        entry++;
+        }
+
+        if (((le32_to_cpu(entry->lo) & 0xfffffff8) != (new_low & 0xfffffff8)) &&
+            (le32_to_cpu(entry->hi) != new_high) && del)
+                return 0;
+
+        if (i == HOP_NUMBER) {
+                if (!del) {
+                        printk(KERN_INFO "%s: table section is full, need to "
+                                        "move to 16kB implementation?\n",
+                                         __FILE__);
+                        return -ENOSPC;
+                } else
+                        return 0;
+        }
+
+        /*
+         * Update the selected entry
+         */
+        if (del) {
+                entry->hi = 0;
+                entry->lo = 0;
+        } else {
+                entry->hi = cpu_to_le32(new_high);
+                entry->lo = cpu_to_le32(new_low);
+        }
+
+        return 0;
+}
+
+/*
+ * ----------------------------------------------------------------------------
+ *  Create an addressTable entry from MAC address info
+ *  found in the specifed net_device struct
+ *
+ *  Input : pointer to ethernet interface network device structure
+ *  Output : N/A
+ */
+static void update_hash_table_mac_address(struct pxa168_eth_private *pep,
+                                          unsigned char *oaddr,
+                                          unsigned char *addr)
+{
+        /* Delete old entry */
+        if (oaddr)
+                add_del_hash_entry(pep, oaddr, 1, 0, HASH_DELETE);
+        /* Add new entry */
+        add_del_hash_entry(pep, addr, 1, 0, HASH_ADD);
+}
+
+static int init_hash_table(struct pxa168_eth_private *pep)
+{
+        /*
+         * Hardware expects CPU to build a hash table based on a predefined
+         * hash function and populate it based on hardware address. The
+         * location of the hash table is identified by 32-bit pointer stored
+         * in HTPR internal register. Two possible sizes exists for the hash
+         * table 8kB (256kB of DRAM required (4 x 64 kB banks)) and 1/2kB
+         * (16kB of DRAM required (4 x 4 kB banks)).We currently only support
+         * 1/2kB.
+         */
+        /* TODO: Add support for 8kB hash table and alternative hash
+         * function.Driver can dynamically switch to them if the 1/2kB hash
+         * table is full.
+         */
+        if (pep->htpr == NULL) {
+                pep->htpr = dma_alloc_coherent(pep->dev->dev.parent,
+                                              HASH_ADDR_TABLE_SIZE,
+                                              &pep->htpr_dma, GFP_KERNEL);
+                if (pep->htpr == NULL)
+                        return -ENOMEM;
+        }
+        memset(pep->htpr, 0, HASH_ADDR_TABLE_SIZE);
+        wrl(pep, HTPR, pep->htpr_dma);
+        return 0;
+}
+
+static void pxa168_eth_set_rx_mode(struct net_device *dev)
+{
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+        struct netdev_hw_addr *ha;
+        u32 val;
+
+        val = rdl(pep, PORT_CONFIG);
+        if (dev->flags & IFF_PROMISC)
+                val |= PCR_PM;
+        else
+                val &= ~PCR_PM;
+        wrl(pep, PORT_CONFIG, val);
+
+        /*
+         * Remove the old list of MAC address and add dev->addr
+         * and multicast address.
+         */
+        memset(pep->htpr, 0, HASH_ADDR_TABLE_SIZE);
+        update_hash_table_mac_address(pep, NULL, dev->dev_addr);
+
+        netdev_for_each_mc_addr(ha, dev)
+                update_hash_table_mac_address(pep, NULL, ha->addr);
+}
+
+static int pxa168_eth_set_mac_address(struct net_device *dev, void *addr)
+{
+        struct sockaddr *sa = addr;
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+        unsigned char oldMac[ETH_ALEN];
+
+        if (!is_valid_ether_addr(sa->sa_data))
+                return -EINVAL;
+        memcpy(oldMac, dev->dev_addr, ETH_ALEN);
+        memcpy(dev->dev_addr, sa->sa_data, ETH_ALEN);
+        netif_addr_lock_bh(dev);
+        update_hash_table_mac_address(pep, oldMac, dev->dev_addr);
+        netif_addr_unlock_bh(dev);
+        return 0;
+}
+
+static void eth_port_start(struct net_device *dev)
+{
+        unsigned int val = 0;
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+        int tx_curr_desc, rx_curr_desc;
+
+        /* Perform PHY reset, if there is a PHY. */
+        if (pep->phy != NULL) {
+                struct ethtool_cmd cmd;
+
+                pxa168_get_settings(pep->dev, &cmd);
+                ethernet_phy_reset(pep);
+                pxa168_set_settings(pep->dev, &cmd);
+        }
+
+        /* Assignment of Tx CTRP of given queue */
+        tx_curr_desc = pep->tx_curr_desc_q;
+        wrl(pep, ETH_C_TX_DESC_1,
+            (u32) ((struct tx_desc *)pep->tx_desc_dma + tx_curr_desc));
+
+        /* Assignment of Rx CRDP of given queue */
+        rx_curr_desc = pep->rx_curr_desc_q;
+        wrl(pep, ETH_C_RX_DESC_0,
+            (u32) ((struct rx_desc *)pep->rx_desc_dma + rx_curr_desc));
+
+        wrl(pep, ETH_F_RX_DESC_0,
+            (u32) ((struct rx_desc *)pep->rx_desc_dma + rx_curr_desc));
+
+        /* Clear all interrupts */
+        wrl(pep, INT_CAUSE, 0);
+
+        /* Enable all interrupts for receive, transmit and error. */
+        wrl(pep, INT_MASK, ALL_INTS);
+
+        val = rdl(pep, PORT_CONFIG);
+        val |= PCR_EN;
+        wrl(pep, PORT_CONFIG, val);
+
+        /* Start RX DMA engine */
+        val = rdl(pep, SDMA_CMD);
+        val |= SDMA_CMD_ERD;
+        wrl(pep, SDMA_CMD, val);
+}
+
+static void eth_port_reset(struct net_device *dev)
+{
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+        unsigned int val = 0;
+
+        /* Stop all interrupts for receive, transmit and error. */
+        wrl(pep, INT_MASK, 0);
+
+        /* Clear all interrupts */
+        wrl(pep, INT_CAUSE, 0);
+
+        /* Stop RX DMA */
+        val = rdl(pep, SDMA_CMD);
+        val &= ~SDMA_CMD_ERD;   /* abort dma command */
+
+        /* Abort any transmit and receive operations and put DMA
+         * in idle state.
+         */
+        abort_dma(pep);
+
+        /* Disable port */
+        val = rdl(pep, PORT_CONFIG);
+        val &= ~PCR_EN;
+        wrl(pep, PORT_CONFIG, val);
+}
+
+/*
+ * txq_reclaim - Free the tx desc data for completed descriptors
+ * If force is non-zero, frees uncompleted descriptors as well
+ */
+static int txq_reclaim(struct net_device *dev, int force)
+{
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+        struct tx_desc *desc;
+        u32 cmd_sts;
+        struct sk_buff *skb;
+        int tx_index;
+        dma_addr_t addr;
+        int count;
+        int released = 0;
+
+        netif_tx_lock(dev);
+
+        pep->work_todo &= ~WORK_TX_DONE;
+        while (pep->tx_desc_count > 0) {
+                tx_index = pep->tx_used_desc_q;
+                desc = &pep->p_tx_desc_area[tx_index];
+                cmd_sts = desc->cmd_sts;
+                if (!force && (cmd_sts & BUF_OWNED_BY_DMA)) {
+                        if (released > 0) {
+                                goto txq_reclaim_end;
+                        } else {
+                                released = -1;
+                                goto txq_reclaim_end;
+                        }
+                }
+                pep->tx_used_desc_q = (tx_index + 1) % pep->tx_ring_size;
+                pep->tx_desc_count--;
+                addr = desc->buf_ptr;
+                count = desc->byte_cnt;
+                skb = pep->tx_skb[tx_index];
+                if (skb)
+                        pep->tx_skb[tx_index] = NULL;
+
+                if (cmd_sts & TX_ERROR) {
+                        if (net_ratelimit())
+                                printk(KERN_ERR "%s: Error in TX\n", dev->name);
+                        dev->stats.tx_errors++;
+                }
+                dma_unmap_single(NULL, addr, count, DMA_TO_DEVICE);
+                if (skb)
+                        dev_kfree_skb_irq(skb);
+                released++;
+        }
+txq_reclaim_end:
+        netif_tx_unlock(dev);
+        return released;
+}
+
+static void pxa168_eth_tx_timeout(struct net_device *dev)
+{
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+
+        printk(KERN_INFO "%s: TX timeout  desc_count %d\n",
+               dev->name, pep->tx_desc_count);
+
+        schedule_work(&pep->tx_timeout_task);
+}
+
+static void pxa168_eth_tx_timeout_task(struct work_struct *work)
+{
+        struct pxa168_eth_private *pep = container_of(work,
+                                                 struct pxa168_eth_private,
+                                                 tx_timeout_task);
+        struct net_device *dev = pep->dev;
+        pxa168_eth_stop(dev);
+        pxa168_eth_open(dev);
+}
+
+static int rxq_process(struct net_device *dev, int budget)
+{
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+        struct net_device_stats *stats = &dev->stats;
+        unsigned int received_packets = 0;
+        struct sk_buff *skb;
+
+        while (budget-- > 0) {
+                int rx_next_curr_desc, rx_curr_desc, rx_used_desc;
+                struct rx_desc *rx_desc;
+                unsigned int cmd_sts;
+
+                /* Do not process Rx ring in case of Rx ring resource error */
+                if (pep->rx_resource_err)
+                        break;
+                rx_curr_desc = pep->rx_curr_desc_q;
+                rx_used_desc = pep->rx_used_desc_q;
+                rx_desc = &pep->p_rx_desc_area[rx_curr_desc];
+                cmd_sts = rx_desc->cmd_sts;
+                rmb();
+                if (cmd_sts & (BUF_OWNED_BY_DMA))
+                        break;
+                skb = pep->rx_skb[rx_curr_desc];
+                pep->rx_skb[rx_curr_desc] = NULL;
+
+                rx_next_curr_desc = (rx_curr_desc + 1) % pep->rx_ring_size;
+                pep->rx_curr_desc_q = rx_next_curr_desc;
+
+                /* Rx descriptors exhausted. */
+                /* Set the Rx ring resource error flag */
+                if (rx_next_curr_desc == rx_used_desc)
+                        pep->rx_resource_err = 1;
+                pep->rx_desc_count--;
+                dma_unmap_single(NULL, rx_desc->buf_ptr,
+                                 rx_desc->buf_size,
+                                 DMA_FROM_DEVICE);
+                received_packets++;
+                /*
+                 * Update statistics.
+                 * Note byte count includes 4 byte CRC count
+                 */
+                stats->rx_packets++;
+                stats->rx_bytes += rx_desc->byte_cnt;
+                /*
+                 * In case received a packet without first / last bits on OR
+                 * the error summary bit is on, the packets needs to be droped.
+                 */
+                if (((cmd_sts & (RX_FIRST_DESC | RX_LAST_DESC)) !=
+                     (RX_FIRST_DESC | RX_LAST_DESC))
+                    || (cmd_sts & RX_ERROR)) {
+
+                        stats->rx_dropped++;
+                        if ((cmd_sts & (RX_FIRST_DESC | RX_LAST_DESC)) !=
+                            (RX_FIRST_DESC | RX_LAST_DESC)) {
+                                if (net_ratelimit())
+                                        printk(KERN_ERR
+                                               "%s: Rx pkt on multiple desc\n",
+                                               dev->name);
+                        }
+                        if (cmd_sts & RX_ERROR)
+                                stats->rx_errors++;
+                        dev_kfree_skb_irq(skb);
+                } else {
+                        /*
+                         * The -4 is for the CRC in the trailer of the
+                         * received packet
+                         */
+                        skb_put(skb, rx_desc->byte_cnt - 4);
+                        skb->protocol = eth_type_trans(skb, dev);
+                        netif_receive_skb(skb);
+                }
+                dev->last_rx = jiffies;
+        }
+        /* Fill RX ring with skb's */
+        rxq_refill(dev);
+        return received_packets;
+}
+
+static int pxa168_eth_collect_events(struct pxa168_eth_private *pep,
+                                     struct net_device *dev)
+{
+        u32 icr;
+        int ret = 0;
+
+        icr = rdl(pep, INT_CAUSE);
+        if (icr == 0)
+                return IRQ_NONE;
+
+        wrl(pep, INT_CAUSE, ~icr);
+        if (icr & (ICR_TXBUF_H | ICR_TXBUF_L)) {
+                pep->work_todo |= WORK_TX_DONE;
+                ret = 1;
+        }
+        if (icr & ICR_RXBUF)
+                ret = 1;
+        if (icr & ICR_MII_CH) {
+                pep->work_todo |= WORK_LINK;
+                ret = 1;
+        }
+        return ret;
+}
+
+static void handle_link_event(struct pxa168_eth_private *pep)
+{
+        struct net_device *dev = pep->dev;
+        u32 port_status;
+        int speed;
+        int duplex;
+        int fc;
+
+        port_status = rdl(pep, PORT_STATUS);
+        if (!(port_status & LINK_UP)) {
+                if (netif_carrier_ok(dev)) {
+                        printk(KERN_INFO "%s: link down\n", dev->name);
+                        netif_carrier_off(dev);
+                        txq_reclaim(dev, 1);
+                }
+                return;
+        }
+        if (port_status & PORT_SPEED_100)
+                speed = 100;
+        else
+                speed = 10;
+
+        duplex = (port_status & FULL_DUPLEX) ? 1 : 0;
+        fc = (port_status & FLOW_CONTROL_ENABLED) ? 1 : 0;
+        printk(KERN_INFO "%s: link up, %d Mb/s, %s duplex, "
+               "flow control %sabled\n", dev->name,
+               speed, duplex ? "full" : "half", fc ? "en" : "dis");
+        if (!netif_carrier_ok(dev))
+                netif_carrier_on(dev);
+}
+
+static irqreturn_t pxa168_eth_int_handler(int irq, void *dev_id)
+{
+        struct net_device *dev = (struct net_device *)dev_id;
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+
+        if (unlikely(!pxa168_eth_collect_events(pep, dev)))
+                return IRQ_NONE;
+        /* Disable interrupts */
+        wrl(pep, INT_MASK, 0);
+        napi_schedule(&pep->napi);
+        return IRQ_HANDLED;
+}
+
+static void pxa168_eth_recalc_skb_size(struct pxa168_eth_private *pep)
+{
+        int skb_size;
+
+        /*
+         * Reserve 2+14 bytes for an ethernet header (the hardware
+         * automatically prepends 2 bytes of dummy data to each
+         * received packet), 16 bytes for up to four VLAN tags, and
+         * 4 bytes for the trailing FCS -- 36 bytes total.
+         */
+        skb_size = pep->dev->mtu + 36;
+
+        /*
+         * Make sure that the skb size is a multiple of 8 bytes, as
+         * the lower three bits of the receive descriptor's buffer
+         * size field are ignored by the hardware.
+         */
+        pep->skb_size = (skb_size + 7) & ~7;
+
+        /*
+         * If NET_SKB_PAD is smaller than a cache line,
+         * netdev_alloc_skb() will cause skb->data to be misaligned
+         * to a cache line boundary.  If this is the case, include
+         * some extra space to allow re-aligning the data area.
+         */
+        pep->skb_size += SKB_DMA_REALIGN;
+
+}
+
+static int set_port_config_ext(struct pxa168_eth_private *pep)
+{
+        int skb_size;
+
+        pxa168_eth_recalc_skb_size(pep);
+        if  (pep->skb_size <= 1518)
+                skb_size = PCXR_MFL_1518;
+        else if (pep->skb_size <= 1536)
+                skb_size = PCXR_MFL_1536;
+        else if (pep->skb_size <= 2048)
+                skb_size = PCXR_MFL_2048;
+        else
+                skb_size = PCXR_MFL_64K;
+
+        /* Extended Port Configuration */
+        wrl(pep,
+            PORT_CONFIG_EXT, PCXR_2BSM | /* Two byte prefix aligns IP hdr */
+            PCXR_DSCP_EN |               /* Enable DSCP in IP */
+            skb_size | PCXR_FLP |        /* do not force link pass */
+            PCXR_TX_HIGH_PRI);           /* Transmit - high priority queue */
+
+        return 0;
+}
+
+static int pxa168_init_hw(struct pxa168_eth_private *pep)
+{
+        int err = 0;
+
+        /* Disable interrupts */
+        wrl(pep, INT_MASK, 0);
+        wrl(pep, INT_CAUSE, 0);
+        /* Write to ICR to clear interrupts. */
+        wrl(pep, INT_W_CLEAR, 0);
+        /* Abort any transmit and receive operations and put DMA
+         * in idle state.
+         */
+        abort_dma(pep);
+        /* Initialize address hash table */
+        err = init_hash_table(pep);
+        if (err)
+                return err;
+        /* SDMA configuration */
+        wrl(pep, SDMA_CONFIG, SDCR_BSZ8 |       /* Burst size = 32 bytes */
+            SDCR_RIFB |                         /* Rx interrupt on frame */
+            SDCR_BLMT |                         /* Little endian transmit */
+            SDCR_BLMR |                         /* Little endian receive */
+            SDCR_RC_MAX_RETRANS);               /* Max retransmit count */
+        /* Port Configuration */
+        wrl(pep, PORT_CONFIG, PCR_HS);          /* Hash size is 1/2kb */
+        set_port_config_ext(pep);
+
+        return err;
+}
+
+static int rxq_init(struct net_device *dev)
+{
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+        struct rx_desc *p_rx_desc;
+        int size = 0, i = 0;
+        int rx_desc_num = pep->rx_ring_size;
+
+        /* Allocate RX skb rings */
+        pep->rx_skb = kmalloc(sizeof(*pep->rx_skb) * pep->rx_ring_size,
+                             GFP_KERNEL);
+        if (!pep->rx_skb) {
+                printk(KERN_ERR "%s: Cannot alloc RX skb ring\n", dev->name);
+                return -ENOMEM;
+        }
+        /* Allocate RX ring */
+        pep->rx_desc_count = 0;
+        size = pep->rx_ring_size * sizeof(struct rx_desc);
+        pep->rx_desc_area_size = size;
+        pep->p_rx_desc_area = dma_alloc_coherent(pep->dev->dev.parent, size,
+                                                &pep->rx_desc_dma, GFP_KERNEL);
+        if (!pep->p_rx_desc_area) {
+                printk(KERN_ERR "%s: Cannot alloc RX ring (size %d bytes)\n",
+                       dev->name, size);
+                goto out;
+        }
+        memset((void *)pep->p_rx_desc_area, 0, size);
+        /* initialize the next_desc_ptr links in the Rx descriptors ring */
+        p_rx_desc = (struct rx_desc *)pep->p_rx_desc_area;
+        for (i = 0; i < rx_desc_num; i++) {
+                p_rx_desc[i].next_desc_ptr = pep->rx_desc_dma +
+                    ((i + 1) % rx_desc_num) * sizeof(struct rx_desc);
+        }
+        /* Save Rx desc pointer to driver struct. */
+        pep->rx_curr_desc_q = 0;
+        pep->rx_used_desc_q = 0;
+        pep->rx_desc_area_size = rx_desc_num * sizeof(struct rx_desc);
+        return 0;
+out:
+        kfree(pep->rx_skb);
+        return -ENOMEM;
+}
+
+static void rxq_deinit(struct net_device *dev)
+{
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+        int curr;
+
+        /* Free preallocated skb's on RX rings */
+        for (curr = 0; pep->rx_desc_count && curr < pep->rx_ring_size; curr++) {
+                if (pep->rx_skb[curr]) {
+                        dev_kfree_skb(pep->rx_skb[curr]);
+                        pep->rx_desc_count--;
+                }
+        }
+        if (pep->rx_desc_count)
+                printk(KERN_ERR
+                       "Error in freeing Rx Ring. %d skb's still\n",
+                       pep->rx_desc_count);
+        /* Free RX ring */
+        if (pep->p_rx_desc_area)
+                dma_free_coherent(pep->dev->dev.parent, pep->rx_desc_area_size,
+                                  pep->p_rx_desc_area, pep->rx_desc_dma);
+        kfree(pep->rx_skb);
+}
+
+static int txq_init(struct net_device *dev)
+{
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+        struct tx_desc *p_tx_desc;
+        int size = 0, i = 0;
+        int tx_desc_num = pep->tx_ring_size;
+
+        pep->tx_skb = kmalloc(sizeof(*pep->tx_skb) * pep->tx_ring_size,
+                             GFP_KERNEL);
+        if (!pep->tx_skb) {
+                printk(KERN_ERR "%s: Cannot alloc TX skb ring\n", dev->name);
+                return -ENOMEM;
+        }
+        /* Allocate TX ring */
+        pep->tx_desc_count = 0;
+        size = pep->tx_ring_size * sizeof(struct tx_desc);
+        pep->tx_desc_area_size = size;
+        pep->p_tx_desc_area = dma_alloc_coherent(pep->dev->dev.parent, size,
+                                                &pep->tx_desc_dma, GFP_KERNEL);
+        if (!pep->p_tx_desc_area) {
+                printk(KERN_ERR "%s: Cannot allocate Tx Ring (size %d bytes)\n",
+                       dev->name, size);
+                goto out;
+        }
+        memset((void *)pep->p_tx_desc_area, 0, pep->tx_desc_area_size);
+        /* Initialize the next_desc_ptr links in the Tx descriptors ring */
+        p_tx_desc = (struct tx_desc *)pep->p_tx_desc_area;
+        for (i = 0; i < tx_desc_num; i++) {
+                p_tx_desc[i].next_desc_ptr = pep->tx_desc_dma +
+                    ((i + 1) % tx_desc_num) * sizeof(struct tx_desc);
+        }
+        pep->tx_curr_desc_q = 0;
+        pep->tx_used_desc_q = 0;
+        pep->tx_desc_area_size = tx_desc_num * sizeof(struct tx_desc);
+        return 0;
+out:
+        kfree(pep->tx_skb);
+        return -ENOMEM;
+}
+
+static void txq_deinit(struct net_device *dev)
+{
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+
+        /* Free outstanding skb's on TX ring */
+        txq_reclaim(dev, 1);
+        BUG_ON(pep->tx_used_desc_q != pep->tx_curr_desc_q);
+        /* Free TX ring */
+        if (pep->p_tx_desc_area)
+                dma_free_coherent(pep->dev->dev.parent, pep->tx_desc_area_size,
+                                  pep->p_tx_desc_area, pep->tx_desc_dma);
+        kfree(pep->tx_skb);
+}
+
+static int pxa168_eth_open(struct net_device *dev)
+{
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+        int err;
+
+        err = request_irq(dev->irq, pxa168_eth_int_handler,
+                          IRQF_DISABLED, dev->name, dev);
+        if (err) {
+                dev_printk(KERN_ERR, &dev->dev, "can't assign irq\n");
+                return -EAGAIN;
+        }
+        pep->rx_resource_err = 0;
+        err = rxq_init(dev);
+        if (err != 0)
+                goto out_free_irq;
+        err = txq_init(dev);
+        if (err != 0)
+                goto out_free_rx_skb;
+        pep->rx_used_desc_q = 0;
+        pep->rx_curr_desc_q = 0;
+
+        /* Fill RX ring with skb's */
+        rxq_refill(dev);
+        pep->rx_used_desc_q = 0;
+        pep->rx_curr_desc_q = 0;
+        netif_carrier_off(dev);
+        eth_port_start(dev);
+        napi_enable(&pep->napi);
+        return 0;
+out_free_rx_skb:
+        rxq_deinit(dev);
+out_free_irq:
+        free_irq(dev->irq, dev);
+        return err;
+}
+
+static int pxa168_eth_stop(struct net_device *dev)
+{
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+        eth_port_reset(dev);
+
+        /* Disable interrupts */
+        wrl(pep, INT_MASK, 0);
+        wrl(pep, INT_CAUSE, 0);
+        /* Write to ICR to clear interrupts. */
+        wrl(pep, INT_W_CLEAR, 0);
+        napi_disable(&pep->napi);
+        del_timer_sync(&pep->timeout);
+        netif_carrier_off(dev);
+        free_irq(dev->irq, dev);
+        rxq_deinit(dev);
+        txq_deinit(dev);
+
+        return 0;
+}
+
+static int pxa168_eth_change_mtu(struct net_device *dev, int mtu)
+{
+        int retval;
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+
+        if ((mtu > 9500) || (mtu < 68))
+                return -EINVAL;
+
+        dev->mtu = mtu;
+        retval = set_port_config_ext(pep);
+
+        if (!netif_running(dev))
+                return 0;
+
+        /*
+         * Stop and then re-open the interface. This will allocate RX
+         * skbs of the new MTU.
+         * There is a possible danger that the open will not succeed,
+         * due to memory being full.
+         */
+        pxa168_eth_stop(dev);
+        if (pxa168_eth_open(dev)) {
+                dev_printk(KERN_ERR, &dev->dev,
+                           "fatal error on re-opening device after "
+                           "MTU change\n");
+        }
+
+        return 0;
+}
+
+static int eth_alloc_tx_desc_index(struct pxa168_eth_private *pep)
+{
+        int tx_desc_curr;
+
+        tx_desc_curr = pep->tx_curr_desc_q;
+        pep->tx_curr_desc_q = (tx_desc_curr + 1) % pep->tx_ring_size;
+        BUG_ON(pep->tx_curr_desc_q == pep->tx_used_desc_q);
+        pep->tx_desc_count++;
+
+        return tx_desc_curr;
+}
+
+static int pxa168_rx_poll(struct napi_struct *napi, int budget)
+{
+        struct pxa168_eth_private *pep =
+            container_of(napi, struct pxa168_eth_private, napi);
+        struct net_device *dev = pep->dev;
+        int work_done = 0;
+
+        if (unlikely(pep->work_todo & WORK_LINK)) {
+                pep->work_todo &= ~(WORK_LINK);
+                handle_link_event(pep);
+        }
+        /*
+         * We call txq_reclaim every time since in NAPI interupts are disabled
+         * and due to this we miss the TX_DONE interrupt,which is not updated in
+         * interrupt status register.
+         */
+        txq_reclaim(dev, 0);
+        if (netif_queue_stopped(dev)
+            && pep->tx_ring_size - pep->tx_desc_count > 1) {
+                netif_wake_queue(dev);
+        }
+        work_done = rxq_process(dev, budget);
+        if (work_done < budget) {
+                napi_complete(napi);
+                wrl(pep, INT_MASK, ALL_INTS);
+        }
+
+        return work_done;
+}
+
+static int pxa168_eth_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+        struct net_device_stats *stats = &dev->stats;
+        struct tx_desc *desc;
+        int tx_index;
+        int length;
+
+        tx_index = eth_alloc_tx_desc_index(pep);
+        desc = &pep->p_tx_desc_area[tx_index];
+        length = skb->len;
+        pep->tx_skb[tx_index] = skb;
+        desc->byte_cnt = length;
+        desc->buf_ptr = dma_map_single(NULL, skb->data, length, DMA_TO_DEVICE);
+        wmb();
+        desc->cmd_sts = BUF_OWNED_BY_DMA | TX_GEN_CRC | TX_FIRST_DESC |
+                        TX_ZERO_PADDING | TX_LAST_DESC | TX_EN_INT;
+        wmb();
+        wrl(pep, SDMA_CMD, SDMA_CMD_TXDH | SDMA_CMD_ERD);
+
+        stats->tx_bytes += skb->len;
+        stats->tx_packets++;
+        dev->trans_start = jiffies;
+        if (pep->tx_ring_size - pep->tx_desc_count <= 1) {
+                /* We handled the current skb, but now we are out of space.*/
+                netif_stop_queue(dev);
+        }
+
+        return NETDEV_TX_OK;
+}
+
+static int smi_wait_ready(struct pxa168_eth_private *pep)
+{
+        int i = 0;
+
+        /* wait for the SMI register to become available */
+        for (i = 0; rdl(pep, SMI) & SMI_BUSY; i++) {
+                if (i == PHY_WAIT_ITERATIONS)
+                        return -ETIMEDOUT;
+                msleep(10);
+        }
+
+        return 0;
+}
+
+static int pxa168_smi_read(struct mii_bus *bus, int phy_addr, int regnum)
+{
+        struct pxa168_eth_private *pep = bus->priv;
+        int i = 0;
+        int val;
+
+        if (smi_wait_ready(pep)) {
+                printk(KERN_WARNING "pxa168_eth: SMI bus busy timeout\n");
+                return -ETIMEDOUT;
+        }
+        wrl(pep, SMI, (phy_addr << 16) | (regnum << 21) | SMI_OP_R);
+        /* now wait for the data to be valid */
+        for (i = 0; !((val = rdl(pep, SMI)) & SMI_R_VALID); i++) {
+                if (i == PHY_WAIT_ITERATIONS) {
+                        printk(KERN_WARNING
+                                "pxa168_eth: SMI bus read not valid\n");
+                        return -ENODEV;
+                }
+                msleep(10);
+        }
+
+        return val & 0xffff;
+}
+
+static int pxa168_smi_write(struct mii_bus *bus, int phy_addr, int regnum,
+                            u16 value)
+{
+        struct pxa168_eth_private *pep = bus->priv;
+
+        if (smi_wait_ready(pep)) {
+                printk(KERN_WARNING "pxa168_eth: SMI bus busy timeout\n");
+                return -ETIMEDOUT;
+        }
+
+        wrl(pep, SMI, (phy_addr << 16) | (regnum << 21) |
+            SMI_OP_W | (value & 0xffff));
+
+        if (smi_wait_ready(pep)) {
+                printk(KERN_ERR "pxa168_eth: SMI bus busy timeout\n");
+                return -ETIMEDOUT;
+        }
+
+        return 0;
+}
+
+static int pxa168_eth_do_ioctl(struct net_device *dev, struct ifreq *ifr,
+                               int cmd)
+{
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+        if (pep->phy != NULL)
+                return phy_mii_ioctl(pep->phy, if_mii(ifr), cmd);
+
+        return -EOPNOTSUPP;
+}
+
+static struct phy_device *phy_scan(struct pxa168_eth_private *pep, int phy_addr)
+{
+        struct mii_bus *bus = pep->smi_bus;
+        struct phy_device *phydev;
+        int start;
+        int num;
+        int i;
+
+        if (phy_addr == PXA168_ETH_PHY_ADDR_DEFAULT) {
+                /* Scan entire range */
+                start = ethernet_phy_get(pep);
+                num = 32;
+        } else {
+                /* Use phy addr specific to platform */
+                start = phy_addr & 0x1f;
+                num = 1;
+        }
+        phydev = NULL;
+        for (i = 0; i < num; i++) {
+                int addr = (start + i) & 0x1f;
+                if (bus->phy_map[addr] == NULL)
+                        mdiobus_scan(bus, addr);
+
+                if (phydev == NULL) {
+                        phydev = bus->phy_map[addr];
+                        if (phydev != NULL)
+                                ethernet_phy_set_addr(pep, addr);
+                }
+        }
+
+        return phydev;
+}
+
+static void phy_init(struct pxa168_eth_private *pep, int speed, int duplex)
+{
+        struct phy_device *phy = pep->phy;
+        ethernet_phy_reset(pep);
+
+        phy_attach(pep->dev, dev_name(&phy->dev), 0, PHY_INTERFACE_MODE_MII);
+
+        if (speed == 0) {
+                phy->autoneg = AUTONEG_ENABLE;
+                phy->speed = 0;
+                phy->duplex = 0;
+                phy->supported &= PHY_BASIC_FEATURES;
+                phy->advertising = phy->supported | ADVERTISED_Autoneg;
+        } else {
+                phy->autoneg = AUTONEG_DISABLE;
+                phy->advertising = 0;
+                phy->speed = speed;
+                phy->duplex = duplex;
+        }
+        phy_start_aneg(phy);
+}
+
+static int ethernet_phy_setup(struct net_device *dev)
+{
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+
+        if (pep->pd != NULL) {
+                if (pep->pd->init)
+                        pep->pd->init();
+        }
+        pep->phy = phy_scan(pep, pep->pd->phy_addr & 0x1f);
+        if (pep->phy != NULL)
+                phy_init(pep, pep->pd->speed, pep->pd->duplex);
+        update_hash_table_mac_address(pep, NULL, dev->dev_addr);
+
+        return 0;
+}
+
+static int pxa168_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+        int err;
+
+        err = phy_read_status(pep->phy);
+        if (err == 0)
+                err = phy_ethtool_gset(pep->phy, cmd);
+
+        return err;
+}
+
+static int pxa168_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+
+        return phy_ethtool_sset(pep->phy, cmd);
+}
+
+static void pxa168_get_drvinfo(struct net_device *dev,
+                               struct ethtool_drvinfo *info)
+{
+        strncpy(info->driver, DRIVER_NAME, 32);
+        strncpy(info->version, DRIVER_VERSION, 32);
+        strncpy(info->fw_version, "N/A", 32);
+        strncpy(info->bus_info, "N/A", 32);
+}
+
+static u32 pxa168_get_link(struct net_device *dev)
+{
+        return !!netif_carrier_ok(dev);
+}
+
+static const struct ethtool_ops pxa168_ethtool_ops = {
+        .get_settings = pxa168_get_settings,
+        .set_settings = pxa168_set_settings,
+        .get_drvinfo = pxa168_get_drvinfo,
+        .get_link = pxa168_get_link,
+};
+
+static const struct net_device_ops pxa168_eth_netdev_ops = {
+        .ndo_open = pxa168_eth_open,
+        .ndo_stop = pxa168_eth_stop,
+        .ndo_start_xmit = pxa168_eth_start_xmit,
+        .ndo_set_rx_mode = pxa168_eth_set_rx_mode,
+        .ndo_set_mac_address = pxa168_eth_set_mac_address,
+        .ndo_validate_addr = eth_validate_addr,
+        .ndo_do_ioctl = pxa168_eth_do_ioctl,
+        .ndo_change_mtu = pxa168_eth_change_mtu,
+        .ndo_tx_timeout = pxa168_eth_tx_timeout,
+};
+
+static int pxa168_eth_probe(struct platform_device *pdev)
+{
+        struct pxa168_eth_private *pep = NULL;
+        struct net_device *dev = NULL;
+        struct resource *res;
+        struct clk *clk;
+        int err;
+
+        printk(KERN_NOTICE "PXA168 10/100 Ethernet Driver\n");
+
+        clk = clk_get(&pdev->dev, "MFUCLK");
+        if (IS_ERR(clk)) {
+                printk(KERN_ERR "%s: Fast Ethernet failed to get clock\n",
+                        DRIVER_NAME);
+                return -ENODEV;
+        }
+        clk_enable(clk);
+
+        dev = alloc_etherdev(sizeof(struct pxa168_eth_private));
+        if (!dev) {
+                err = -ENOMEM;
+                goto out;
+        }
+
+        platform_set_drvdata(pdev, dev);
+        pep = netdev_priv(dev);
+        pep->dev = dev;
+        pep->clk = clk;
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (res == NULL) {
+                err = -ENODEV;
+                goto out;
+        }
+        pep->base = ioremap(res->start, res->end - res->start + 1);
+        if (pep->base == NULL) {
+                err = -ENOMEM;
+                goto out;
+        }
+        res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+        BUG_ON(!res);
+        dev->irq = res->start;
+        dev->netdev_ops = &pxa168_eth_netdev_ops;
+        dev->watchdog_timeo = 2 * HZ;
+        dev->base_addr = 0;
+        SET_ETHTOOL_OPS(dev, &pxa168_ethtool_ops);
+
+        INIT_WORK(&pep->tx_timeout_task, pxa168_eth_tx_timeout_task);
+
+        printk(KERN_INFO "%s:Using random mac address\n", DRIVER_NAME);
+        random_ether_addr(dev->dev_addr);
+
+        pep->pd = pdev->dev.platform_data;
+        pep->rx_ring_size = NUM_RX_DESCS;
+        if (pep->pd->rx_queue_size)
+                pep->rx_ring_size = pep->pd->rx_queue_size;
+
+        pep->tx_ring_size = NUM_TX_DESCS;
+        if (pep->pd->tx_queue_size)
+                pep->tx_ring_size = pep->pd->tx_queue_size;
+
+        pep->port_num = pep->pd->port_number;
+        /* Hardware supports only 3 ports */
+        BUG_ON(pep->port_num > 2);
+        netif_napi_add(dev, &pep->napi, pxa168_rx_poll, pep->rx_ring_size);
+
+        memset(&pep->timeout, 0, sizeof(struct timer_list));
+        init_timer(&pep->timeout);
+        pep->timeout.function = rxq_refill_timer_wrapper;
+        pep->timeout.data = (unsigned long)pep;
+
+        pep->smi_bus = mdiobus_alloc();
+        if (pep->smi_bus == NULL) {
+                err = -ENOMEM;
+                goto out;
+        }
+        pep->smi_bus->priv = pep;
+        pep->smi_bus->name = "pxa168_eth smi";
+        pep->smi_bus->read = pxa168_smi_read;
+        pep->smi_bus->write = pxa168_smi_write;
+        snprintf(pep->smi_bus->id, MII_BUS_ID_SIZE, "%d", pdev->id);
+        pep->smi_bus->parent = &pdev->dev;
+        pep->smi_bus->phy_mask = 0xffffffff;
+        if (mdiobus_register(pep->smi_bus) < 0) {
+                err = -ENOMEM;
+                goto out;
+        }
+        pxa168_init_hw(pep);
+        err = ethernet_phy_setup(dev);
+        if (err)
+                goto out;
+        SET_NETDEV_DEV(dev, &pdev->dev);
+        err = register_netdev(dev);
+        if (err)
+                goto out;
+        return 0;
+out:
+        if (pep->clk) {
+                clk_disable(pep->clk);
+                clk_put(pep->clk);
+                pep->clk = NULL;
+        }
+        if (pep->base) {
+                iounmap(pep->base);
+                pep->base = NULL;
+        }
+        if (dev)
+                free_netdev(dev);
+        return err;
+}
+
+static int pxa168_eth_remove(struct platform_device *pdev)
+{
+        struct net_device *dev = platform_get_drvdata(pdev);
+        struct pxa168_eth_private *pep = netdev_priv(dev);
+
+        if (pep->htpr) {
+                dma_free_coherent(pep->dev->dev.parent, HASH_ADDR_TABLE_SIZE,
+                                  pep->htpr, pep->htpr_dma);
+                pep->htpr = NULL;
+        }
+        if (pep->clk) {
+                clk_disable(pep->clk);
+                clk_put(pep->clk);
+                pep->clk = NULL;
+        }
+        if (pep->phy != NULL)
+                phy_detach(pep->phy);
+
+        iounmap(pep->base);
+        pep->base = NULL;
+        unregister_netdev(dev);
+        flush_scheduled_work();
+        free_netdev(dev);
+        platform_set_drvdata(pdev, NULL);
+        return 0;
+}
+
+static void pxa168_eth_shutdown(struct platform_device *pdev)
+{
+        struct net_device *dev = platform_get_drvdata(pdev);
+        eth_port_reset(dev);
+}
+
+#ifdef CONFIG_PM
+static int pxa168_eth_resume(struct platform_device *pdev)
+{
+        return -ENOSYS;
+}
+
+static int pxa168_eth_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        return -ENOSYS;
+}
+
+#else
+#define pxa168_eth_resume NULL
+#define pxa168_eth_suspend NULL
+#endif
+
+static struct platform_driver pxa168_eth_driver = {
+        .probe = pxa168_eth_probe,
+        .remove = pxa168_eth_remove,
+        .shutdown = pxa168_eth_shutdown,
+        .resume = pxa168_eth_resume,
+        .suspend = pxa168_eth_suspend,
+        .driver = {
+                   .name = DRIVER_NAME,
+                   },
+};
+
+static int __init pxa168_init_module(void)
+{
+        return platform_driver_register(&pxa168_eth_driver);
+}
+
+static void __exit pxa168_cleanup_module(void)
+{
+        platform_driver_unregister(&pxa168_eth_driver);
+}
+
+module_init(pxa168_init_module);
+module_exit(pxa168_cleanup_module);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Ethernet driver for Marvell PXA168");
+MODULE_ALIAS("platform:pxa168_eth");