nuvoton: Move the Nuvoton driver

Move the Nuvoton driver into drivers/net/ethernet/nuvoton/ and
make the necessary Kconfig and Makefile changes.

CC: Wan ZongShun <mcuos.com@gmail.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

3 files changed, 1157 insertions, 0 deletions

diff --git a/drivers/net/ethernet/nuvoton/Kconfig b/drivers/net/ethernet/nuvoton/Kconfig
new file mode 100644
index 000000000000..3b91c3be6270
--- /dev/null
+++ b/drivers/net/ethernet/nuvoton/Kconfig
@@ -0,0 +1,29 @@
+#
+# Nuvoton network device configuration
+#
+
+config NET_VENDOR_NUVOTON
+        bool "Nuvoton devices"
+        depends on ARM && ARCH_W90X900
+        ---help---
+          If you have a network (Ethernet) card belonging to this class, say Y
+          and read the Ethernet-HOWTO, available from
+          <http://www.tldp.org/docs.html#howto>.
+
+          Note that the answer to this question doesn't directly affect the
+          kernel: saying N will just cause the configurator to skip all
+          the questions about Nuvoton cards. If you say Y, you will be asked
+          for your specific card in the following questions.
+
+if NET_VENDOR_NUVOTON
+
+config W90P910_ETH
+        tristate "Nuvoton w90p910 Ethernet support"
+        depends on ARM && ARCH_W90X900
+        select PHYLIB
+        select MII
+        ---help---
+          Say Y here if you want to use built-in Ethernet ports
+          on w90p910 processor.
+
+endif # NET_VENDOR_NUVOTON
diff --git a/drivers/net/ethernet/nuvoton/Makefile b/drivers/net/ethernet/nuvoton/Makefile
new file mode 100644
index 000000000000..171aa044bd3b
--- /dev/null
+++ b/drivers/net/ethernet/nuvoton/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for the Nuvoton network device drivers.
+#
+
+obj-$(CONFIG_W90P910_ETH) += w90p910_ether.o
diff --git a/drivers/net/ethernet/nuvoton/w90p910_ether.c b/drivers/net/ethernet/nuvoton/w90p910_ether.c
new file mode 100644
index 000000000000..bfea499a3513
--- /dev/null
+++ b/drivers/net/ethernet/nuvoton/w90p910_ether.c
@@ -0,0 +1,1123 @@
+/*
+ * Copyright (c) 2008-2009 Nuvoton technology corporation.
+ *
+ * Wan ZongShun <mcuos.com@gmail.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;version 2 of the License.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/mii.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/ethtool.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/gfp.h>
+
+#define DRV_MODULE_NAME         "w90p910-emc"
+#define DRV_MODULE_VERSION      "0.1"
+
+/* Ethernet MAC Registers */
+#define REG_CAMCMR              0x00
+#define REG_CAMEN               0x04
+#define REG_CAMM_BASE           0x08
+#define REG_CAML_BASE           0x0c
+#define REG_TXDLSA              0x88
+#define REG_RXDLSA              0x8C
+#define REG_MCMDR               0x90
+#define REG_MIID                0x94
+#define REG_MIIDA               0x98
+#define REG_FFTCR               0x9C
+#define REG_TSDR                0xa0
+#define REG_RSDR                0xa4
+#define REG_DMARFC              0xa8
+#define REG_MIEN                0xac
+#define REG_MISTA               0xb0
+#define REG_CTXDSA              0xcc
+#define REG_CTXBSA              0xd0
+#define REG_CRXDSA              0xd4
+#define REG_CRXBSA              0xd8
+
+/* mac controller bit */
+#define MCMDR_RXON              0x01
+#define MCMDR_ACP               (0x01 << 3)
+#define MCMDR_SPCRC             (0x01 << 5)
+#define MCMDR_TXON              (0x01 << 8)
+#define MCMDR_FDUP              (0x01 << 18)
+#define MCMDR_ENMDC             (0x01 << 19)
+#define MCMDR_OPMOD             (0x01 << 20)
+#define SWR                     (0x01 << 24)
+
+/* cam command regiser */
+#define CAMCMR_AUP              0x01
+#define CAMCMR_AMP              (0x01 << 1)
+#define CAMCMR_ABP              (0x01 << 2)
+#define CAMCMR_CCAM             (0x01 << 3)
+#define CAMCMR_ECMP             (0x01 << 4)
+#define CAM0EN                  0x01
+
+/* mac mii controller bit */
+#define MDCCR                   (0x0a << 20)
+#define PHYAD                   (0x01 << 8)
+#define PHYWR                   (0x01 << 16)
+#define PHYBUSY                 (0x01 << 17)
+#define PHYPRESP                (0x01 << 18)
+#define CAM_ENTRY_SIZE          0x08
+
+/* rx and tx status */
+#define TXDS_TXCP               (0x01 << 19)
+#define RXDS_CRCE               (0x01 << 17)
+#define RXDS_PTLE               (0x01 << 19)
+#define RXDS_RXGD               (0x01 << 20)
+#define RXDS_ALIE               (0x01 << 21)
+#define RXDS_RP                 (0x01 << 22)
+
+/* mac interrupt status*/
+#define MISTA_EXDEF             (0x01 << 19)
+#define MISTA_TXBERR            (0x01 << 24)
+#define MISTA_TDU               (0x01 << 23)
+#define MISTA_RDU               (0x01 << 10)
+#define MISTA_RXBERR            (0x01 << 11)
+
+#define ENSTART                 0x01
+#define ENRXINTR                0x01
+#define ENRXGD                  (0x01 << 4)
+#define ENRXBERR                (0x01 << 11)
+#define ENTXINTR                (0x01 << 16)
+#define ENTXCP                  (0x01 << 18)
+#define ENTXABT                 (0x01 << 21)
+#define ENTXBERR                (0x01 << 24)
+#define ENMDC                   (0x01 << 19)
+#define PHYBUSY                 (0x01 << 17)
+#define MDCCR_VAL               0xa00000
+
+/* rx and tx owner bit */
+#define RX_OWEN_DMA             (0x01 << 31)
+#define RX_OWEN_CPU             (~(0x03 << 30))
+#define TX_OWEN_DMA             (0x01 << 31)
+#define TX_OWEN_CPU             (~(0x01 << 31))
+
+/* tx frame desc controller bit */
+#define MACTXINTEN              0x04
+#define CRCMODE                 0x02
+#define PADDINGMODE             0x01
+
+/* fftcr controller bit */
+#define TXTHD                   (0x03 << 8)
+#define BLENGTH                 (0x01 << 20)
+
+/* global setting for driver */
+#define RX_DESC_SIZE            50
+#define TX_DESC_SIZE            10
+#define MAX_RBUFF_SZ            0x600
+#define MAX_TBUFF_SZ            0x600
+#define TX_TIMEOUT              (HZ/2)
+#define DELAY                   1000
+#define CAM0                    0x0
+
+static int w90p910_mdio_read(struct net_device *dev, int phy_id, int reg);
+
+struct w90p910_rxbd {
+        unsigned int sl;
+        unsigned int buffer;
+        unsigned int reserved;
+        unsigned int next;
+};
+
+struct w90p910_txbd {
+        unsigned int mode;
+        unsigned int buffer;
+        unsigned int sl;
+        unsigned int next;
+};
+
+struct recv_pdesc {
+        struct w90p910_rxbd desclist[RX_DESC_SIZE];
+        char recv_buf[RX_DESC_SIZE][MAX_RBUFF_SZ];
+};
+
+struct tran_pdesc {
+        struct w90p910_txbd desclist[TX_DESC_SIZE];
+        char tran_buf[TX_DESC_SIZE][MAX_TBUFF_SZ];
+};
+
+struct  w90p910_ether {
+        struct recv_pdesc *rdesc;
+        struct tran_pdesc *tdesc;
+        dma_addr_t rdesc_phys;
+        dma_addr_t tdesc_phys;
+        struct net_device_stats stats;
+        struct platform_device *pdev;
+        struct resource *res;
+        struct sk_buff *skb;
+        struct clk *clk;
+        struct clk *rmiiclk;
+        struct mii_if_info mii;
+        struct timer_list check_timer;
+        void __iomem *reg;
+        int rxirq;
+        int txirq;
+        unsigned int cur_tx;
+        unsigned int cur_rx;
+        unsigned int finish_tx;
+        unsigned int rx_packets;
+        unsigned int rx_bytes;
+        unsigned int start_tx_ptr;
+        unsigned int start_rx_ptr;
+        unsigned int linkflag;
+};
+
+static void update_linkspeed_register(struct net_device *dev,
+                                unsigned int speed, unsigned int duplex)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        unsigned int val;
+
+        val = __raw_readl(ether->reg + REG_MCMDR);
+
+        if (speed == SPEED_100) {
+                /* 100 full/half duplex */
+                if (duplex == DUPLEX_FULL) {
+                        val |= (MCMDR_OPMOD | MCMDR_FDUP);
+                } else {
+                        val |= MCMDR_OPMOD;
+                        val &= ~MCMDR_FDUP;
+                }
+        } else {
+                /* 10 full/half duplex */
+                if (duplex == DUPLEX_FULL) {
+                        val |= MCMDR_FDUP;
+                        val &= ~MCMDR_OPMOD;
+                } else {
+                        val &= ~(MCMDR_FDUP | MCMDR_OPMOD);
+                }
+        }
+
+        __raw_writel(val, ether->reg + REG_MCMDR);
+}
+
+static void update_linkspeed(struct net_device *dev)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        struct platform_device *pdev;
+        unsigned int bmsr, bmcr, lpa, speed, duplex;
+
+        pdev = ether->pdev;
+
+        if (!mii_link_ok(&ether->mii)) {
+                ether->linkflag = 0x0;
+                netif_carrier_off(dev);
+                dev_warn(&pdev->dev, "%s: Link down.\n", dev->name);
+                return;
+        }
+
+        if (ether->linkflag == 1)
+                return;
+
+        bmsr = w90p910_mdio_read(dev, ether->mii.phy_id, MII_BMSR);
+        bmcr = w90p910_mdio_read(dev, ether->mii.phy_id, MII_BMCR);
+
+        if (bmcr & BMCR_ANENABLE) {
+                if (!(bmsr & BMSR_ANEGCOMPLETE))
+                        return;
+
+                lpa = w90p910_mdio_read(dev, ether->mii.phy_id, MII_LPA);
+
+                if ((lpa & LPA_100FULL) || (lpa & LPA_100HALF))
+                        speed = SPEED_100;
+                else
+                        speed = SPEED_10;
+
+                if ((lpa & LPA_100FULL) || (lpa & LPA_10FULL))
+                        duplex = DUPLEX_FULL;
+                else
+                        duplex = DUPLEX_HALF;
+
+        } else {
+                speed = (bmcr & BMCR_SPEED100) ? SPEED_100 : SPEED_10;
+                duplex = (bmcr & BMCR_FULLDPLX) ? DUPLEX_FULL : DUPLEX_HALF;
+        }
+
+        update_linkspeed_register(dev, speed, duplex);
+
+        dev_info(&pdev->dev, "%s: Link now %i-%s\n", dev->name, speed,
+                        (duplex == DUPLEX_FULL) ? "FullDuplex" : "HalfDuplex");
+        ether->linkflag = 0x01;
+
+        netif_carrier_on(dev);
+}
+
+static void w90p910_check_link(unsigned long dev_id)
+{
+        struct net_device *dev = (struct net_device *) dev_id;
+        struct w90p910_ether *ether = netdev_priv(dev);
+
+        update_linkspeed(dev);
+        mod_timer(&ether->check_timer, jiffies + msecs_to_jiffies(1000));
+}
+
+static void w90p910_write_cam(struct net_device *dev,
+                                unsigned int x, unsigned char *pval)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        unsigned int msw, lsw;
+
+        msw = (pval[0] << 24) | (pval[1] << 16) | (pval[2] << 8) | pval[3];
+
+        lsw = (pval[4] << 24) | (pval[5] << 16);
+
+        __raw_writel(lsw, ether->reg + REG_CAML_BASE + x * CAM_ENTRY_SIZE);
+        __raw_writel(msw, ether->reg + REG_CAMM_BASE + x * CAM_ENTRY_SIZE);
+}
+
+static int w90p910_init_desc(struct net_device *dev)
+{
+        struct w90p910_ether *ether;
+        struct w90p910_txbd  *tdesc;
+        struct w90p910_rxbd  *rdesc;
+        struct platform_device *pdev;
+        unsigned int i;
+
+        ether = netdev_priv(dev);
+        pdev = ether->pdev;
+
+        ether->tdesc = (struct tran_pdesc *)
+                dma_alloc_coherent(&pdev->dev, sizeof(struct tran_pdesc),
+                                        &ether->tdesc_phys, GFP_KERNEL);
+
+        if (!ether->tdesc) {
+                dev_err(&pdev->dev, "Failed to allocate memory for tx desc\n");
+                return -ENOMEM;
+        }
+
+        ether->rdesc = (struct recv_pdesc *)
+                dma_alloc_coherent(&pdev->dev, sizeof(struct recv_pdesc),
+                                        &ether->rdesc_phys, GFP_KERNEL);
+
+        if (!ether->rdesc) {
+                dev_err(&pdev->dev, "Failed to allocate memory for rx desc\n");
+                dma_free_coherent(&pdev->dev, sizeof(struct tran_pdesc),
+                                        ether->tdesc, ether->tdesc_phys);
+                return -ENOMEM;
+        }
+
+        for (i = 0; i < TX_DESC_SIZE; i++) {
+                unsigned int offset;
+
+                tdesc = &(ether->tdesc->desclist[i]);
+
+                if (i == TX_DESC_SIZE - 1)
+                        offset = offsetof(struct tran_pdesc, desclist[0]);
+                else
+                        offset = offsetof(struct tran_pdesc, desclist[i + 1]);
+
+                tdesc->next = ether->tdesc_phys + offset;
+                tdesc->buffer = ether->tdesc_phys +
+                        offsetof(struct tran_pdesc, tran_buf[i]);
+                tdesc->sl = 0;
+                tdesc->mode = 0;
+        }
+
+        ether->start_tx_ptr = ether->tdesc_phys;
+
+        for (i = 0; i < RX_DESC_SIZE; i++) {
+                unsigned int offset;
+
+                rdesc = &(ether->rdesc->desclist[i]);
+
+                if (i == RX_DESC_SIZE - 1)
+                        offset = offsetof(struct recv_pdesc, desclist[0]);
+                else
+                        offset = offsetof(struct recv_pdesc, desclist[i + 1]);
+
+                rdesc->next = ether->rdesc_phys + offset;
+                rdesc->sl = RX_OWEN_DMA;
+                rdesc->buffer = ether->rdesc_phys +
+                        offsetof(struct recv_pdesc, recv_buf[i]);
+          }
+
+        ether->start_rx_ptr = ether->rdesc_phys;
+
+        return 0;
+}
+
+static void w90p910_set_fifo_threshold(struct net_device *dev)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        unsigned int val;
+
+        val = TXTHD | BLENGTH;
+        __raw_writel(val, ether->reg + REG_FFTCR);
+}
+
+static void w90p910_return_default_idle(struct net_device *dev)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        unsigned int val;
+
+        val = __raw_readl(ether->reg + REG_MCMDR);
+        val |= SWR;
+        __raw_writel(val, ether->reg + REG_MCMDR);
+}
+
+static void w90p910_trigger_rx(struct net_device *dev)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+
+        __raw_writel(ENSTART, ether->reg + REG_RSDR);
+}
+
+static void w90p910_trigger_tx(struct net_device *dev)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+
+        __raw_writel(ENSTART, ether->reg + REG_TSDR);
+}
+
+static void w90p910_enable_mac_interrupt(struct net_device *dev)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        unsigned int val;
+
+        val = ENTXINTR | ENRXINTR | ENRXGD | ENTXCP;
+        val |= ENTXBERR | ENRXBERR | ENTXABT;
+
+        __raw_writel(val, ether->reg + REG_MIEN);
+}
+
+static void w90p910_get_and_clear_int(struct net_device *dev,
+                                                        unsigned int *val)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+
+        *val = __raw_readl(ether->reg + REG_MISTA);
+        __raw_writel(*val, ether->reg + REG_MISTA);
+}
+
+static void w90p910_set_global_maccmd(struct net_device *dev)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        unsigned int val;
+
+        val = __raw_readl(ether->reg + REG_MCMDR);
+        val |= MCMDR_SPCRC | MCMDR_ENMDC | MCMDR_ACP | ENMDC;
+        __raw_writel(val, ether->reg + REG_MCMDR);
+}
+
+static void w90p910_enable_cam(struct net_device *dev)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        unsigned int val;
+
+        w90p910_write_cam(dev, CAM0, dev->dev_addr);
+
+        val = __raw_readl(ether->reg + REG_CAMEN);
+        val |= CAM0EN;
+        __raw_writel(val, ether->reg + REG_CAMEN);
+}
+
+static void w90p910_enable_cam_command(struct net_device *dev)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        unsigned int val;
+
+        val = CAMCMR_ECMP | CAMCMR_ABP | CAMCMR_AMP;
+        __raw_writel(val, ether->reg + REG_CAMCMR);
+}
+
+static void w90p910_enable_tx(struct net_device *dev, unsigned int enable)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        unsigned int val;
+
+        val = __raw_readl(ether->reg + REG_MCMDR);
+
+        if (enable)
+                val |= MCMDR_TXON;
+        else
+                val &= ~MCMDR_TXON;
+
+        __raw_writel(val, ether->reg + REG_MCMDR);
+}
+
+static void w90p910_enable_rx(struct net_device *dev, unsigned int enable)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        unsigned int val;
+
+        val = __raw_readl(ether->reg + REG_MCMDR);
+
+        if (enable)
+                val |= MCMDR_RXON;
+        else
+                val &= ~MCMDR_RXON;
+
+        __raw_writel(val, ether->reg + REG_MCMDR);
+}
+
+static void w90p910_set_curdest(struct net_device *dev)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+
+        __raw_writel(ether->start_rx_ptr, ether->reg + REG_RXDLSA);
+        __raw_writel(ether->start_tx_ptr, ether->reg + REG_TXDLSA);
+}
+
+static void w90p910_reset_mac(struct net_device *dev)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+
+        w90p910_enable_tx(dev, 0);
+        w90p910_enable_rx(dev, 0);
+        w90p910_set_fifo_threshold(dev);
+        w90p910_return_default_idle(dev);
+
+        if (!netif_queue_stopped(dev))
+                netif_stop_queue(dev);
+
+        w90p910_init_desc(dev);
+
+        dev->trans_start = jiffies; /* prevent tx timeout */
+        ether->cur_tx = 0x0;
+        ether->finish_tx = 0x0;
+        ether->cur_rx = 0x0;
+
+        w90p910_set_curdest(dev);
+        w90p910_enable_cam(dev);
+        w90p910_enable_cam_command(dev);
+        w90p910_enable_mac_interrupt(dev);
+        w90p910_enable_tx(dev, 1);
+        w90p910_enable_rx(dev, 1);
+        w90p910_trigger_tx(dev);
+        w90p910_trigger_rx(dev);
+
+        dev->trans_start = jiffies; /* prevent tx timeout */
+
+        if (netif_queue_stopped(dev))
+                netif_wake_queue(dev);
+}
+
+static void w90p910_mdio_write(struct net_device *dev,
+                                        int phy_id, int reg, int data)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        struct platform_device *pdev;
+        unsigned int val, i;
+
+        pdev = ether->pdev;
+
+        __raw_writel(data, ether->reg + REG_MIID);
+
+        val = (phy_id << 0x08) | reg;
+        val |= PHYBUSY | PHYWR | MDCCR_VAL;
+        __raw_writel(val, ether->reg + REG_MIIDA);
+
+        for (i = 0; i < DELAY; i++) {
+                if ((__raw_readl(ether->reg + REG_MIIDA) & PHYBUSY) == 0)
+                        break;
+        }
+
+        if (i == DELAY)
+                dev_warn(&pdev->dev, "mdio write timed out\n");
+}
+
+static int w90p910_mdio_read(struct net_device *dev, int phy_id, int reg)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        struct platform_device *pdev;
+        unsigned int val, i, data;
+
+        pdev = ether->pdev;
+
+        val = (phy_id << 0x08) | reg;
+        val |= PHYBUSY | MDCCR_VAL;
+        __raw_writel(val, ether->reg + REG_MIIDA);
+
+        for (i = 0; i < DELAY; i++) {
+                if ((__raw_readl(ether->reg + REG_MIIDA) & PHYBUSY) == 0)
+                        break;
+        }
+
+        if (i == DELAY) {
+                dev_warn(&pdev->dev, "mdio read timed out\n");
+                data = 0xffff;
+        } else {
+                data = __raw_readl(ether->reg + REG_MIID);
+        }
+
+        return data;
+}
+
+static int w90p910_set_mac_address(struct net_device *dev, void *addr)
+{
+        struct sockaddr *address = addr;
+
+        if (!is_valid_ether_addr(address->sa_data))
+                return -EADDRNOTAVAIL;
+
+        memcpy(dev->dev_addr, address->sa_data, dev->addr_len);
+        w90p910_write_cam(dev, CAM0, dev->dev_addr);
+
+        return 0;
+}
+
+static int w90p910_ether_close(struct net_device *dev)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        struct platform_device *pdev;
+
+        pdev = ether->pdev;
+
+        dma_free_coherent(&pdev->dev, sizeof(struct recv_pdesc),
+                                        ether->rdesc, ether->rdesc_phys);
+        dma_free_coherent(&pdev->dev, sizeof(struct tran_pdesc),
+                                        ether->tdesc, ether->tdesc_phys);
+
+        netif_stop_queue(dev);
+
+        del_timer_sync(&ether->check_timer);
+        clk_disable(ether->rmiiclk);
+        clk_disable(ether->clk);
+
+        free_irq(ether->txirq, dev);
+        free_irq(ether->rxirq, dev);
+
+        return 0;
+}
+
+static struct net_device_stats *w90p910_ether_stats(struct net_device *dev)
+{
+        struct w90p910_ether *ether;
+
+        ether = netdev_priv(dev);
+
+        return &ether->stats;
+}
+
+static int w90p910_send_frame(struct net_device *dev,
+                                        unsigned char *data, int length)
+{
+        struct w90p910_ether *ether;
+        struct w90p910_txbd *txbd;
+        struct platform_device *pdev;
+        unsigned char *buffer;
+
+        ether = netdev_priv(dev);
+        pdev = ether->pdev;
+
+        txbd = &ether->tdesc->desclist[ether->cur_tx];
+        buffer = ether->tdesc->tran_buf[ether->cur_tx];
+
+        if (length > 1514) {
+                dev_err(&pdev->dev, "send data %d bytes, check it\n", length);
+                length = 1514;
+        }
+
+        txbd->sl = length & 0xFFFF;
+
+        memcpy(buffer, data, length);
+
+        txbd->mode = TX_OWEN_DMA | PADDINGMODE | CRCMODE | MACTXINTEN;
+
+        w90p910_enable_tx(dev, 1);
+
+        w90p910_trigger_tx(dev);
+
+        if (++ether->cur_tx >= TX_DESC_SIZE)
+                ether->cur_tx = 0;
+
+        txbd = &ether->tdesc->desclist[ether->cur_tx];
+
+        if (txbd->mode & TX_OWEN_DMA)
+                netif_stop_queue(dev);
+
+        return 0;
+}
+
+static int w90p910_ether_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+
+        if (!(w90p910_send_frame(dev, skb->data, skb->len))) {
+                ether->skb = skb;
+                dev_kfree_skb_irq(skb);
+                return 0;
+        }
+        return -EAGAIN;
+}
+
+static irqreturn_t w90p910_tx_interrupt(int irq, void *dev_id)
+{
+        struct w90p910_ether *ether;
+        struct w90p910_txbd  *txbd;
+        struct platform_device *pdev;
+        struct net_device *dev;
+        unsigned int cur_entry, entry, status;
+
+        dev = dev_id;
+        ether = netdev_priv(dev);
+        pdev = ether->pdev;
+
+        w90p910_get_and_clear_int(dev, &status);
+
+        cur_entry = __raw_readl(ether->reg + REG_CTXDSA);
+
+        entry = ether->tdesc_phys +
+                offsetof(struct tran_pdesc, desclist[ether->finish_tx]);
+
+        while (entry != cur_entry) {
+                txbd = &ether->tdesc->desclist[ether->finish_tx];
+
+                if (++ether->finish_tx >= TX_DESC_SIZE)
+                        ether->finish_tx = 0;
+
+                if (txbd->sl & TXDS_TXCP) {
+                        ether->stats.tx_packets++;
+                        ether->stats.tx_bytes += txbd->sl & 0xFFFF;
+                } else {
+                        ether->stats.tx_errors++;
+                }
+
+                txbd->sl = 0x0;
+                txbd->mode = 0x0;
+
+                if (netif_queue_stopped(dev))
+                        netif_wake_queue(dev);
+
+                entry = ether->tdesc_phys +
+                        offsetof(struct tran_pdesc, desclist[ether->finish_tx]);
+        }
+
+        if (status & MISTA_EXDEF) {
+                dev_err(&pdev->dev, "emc defer exceed interrupt\n");
+        } else if (status & MISTA_TXBERR) {
+                dev_err(&pdev->dev, "emc bus error interrupt\n");
+                w90p910_reset_mac(dev);
+        } else if (status & MISTA_TDU) {
+                if (netif_queue_stopped(dev))
+                        netif_wake_queue(dev);
+        }
+
+        return IRQ_HANDLED;
+}
+
+static void netdev_rx(struct net_device *dev)
+{
+        struct w90p910_ether *ether;
+        struct w90p910_rxbd *rxbd;
+        struct platform_device *pdev;
+        struct sk_buff *skb;
+        unsigned char *data;
+        unsigned int length, status, val, entry;
+
+        ether = netdev_priv(dev);
+        pdev = ether->pdev;
+
+        rxbd = &ether->rdesc->desclist[ether->cur_rx];
+
+        do {
+                val = __raw_readl(ether->reg + REG_CRXDSA);
+
+                entry = ether->rdesc_phys +
+                        offsetof(struct recv_pdesc, desclist[ether->cur_rx]);
+
+                if (val == entry)
+                        break;
+
+                status = rxbd->sl;
+                length = status & 0xFFFF;
+
+                if (status & RXDS_RXGD) {
+                        data = ether->rdesc->recv_buf[ether->cur_rx];
+                        skb = dev_alloc_skb(length+2);
+                        if (!skb) {
+                                dev_err(&pdev->dev, "get skb buffer error\n");
+                                ether->stats.rx_dropped++;
+                                return;
+                        }
+
+                        skb_reserve(skb, 2);
+                        skb_put(skb, length);
+                        skb_copy_to_linear_data(skb, data, length);
+                        skb->protocol = eth_type_trans(skb, dev);
+                        ether->stats.rx_packets++;
+                        ether->stats.rx_bytes += length;
+                        netif_rx(skb);
+                } else {
+                        ether->stats.rx_errors++;
+
+                        if (status & RXDS_RP) {
+                                dev_err(&pdev->dev, "rx runt err\n");
+                                ether->stats.rx_length_errors++;
+                        } else if (status & RXDS_CRCE) {
+                                dev_err(&pdev->dev, "rx crc err\n");
+                                ether->stats.rx_crc_errors++;
+                        } else if (status & RXDS_ALIE) {
+                                dev_err(&pdev->dev, "rx aligment err\n");
+                                ether->stats.rx_frame_errors++;
+                        } else if (status & RXDS_PTLE) {
+                                dev_err(&pdev->dev, "rx longer err\n");
+                                ether->stats.rx_over_errors++;
+                        }
+                }
+
+                rxbd->sl = RX_OWEN_DMA;
+                rxbd->reserved = 0x0;
+
+                if (++ether->cur_rx >= RX_DESC_SIZE)
+                        ether->cur_rx = 0;
+
+                rxbd = &ether->rdesc->desclist[ether->cur_rx];
+
+        } while (1);
+}
+
+static irqreturn_t w90p910_rx_interrupt(int irq, void *dev_id)
+{
+        struct net_device *dev;
+        struct w90p910_ether  *ether;
+        struct platform_device *pdev;
+        unsigned int status;
+
+        dev = dev_id;
+        ether = netdev_priv(dev);
+        pdev = ether->pdev;
+
+        w90p910_get_and_clear_int(dev, &status);
+
+        if (status & MISTA_RDU) {
+                netdev_rx(dev);
+                w90p910_trigger_rx(dev);
+
+                return IRQ_HANDLED;
+        } else if (status & MISTA_RXBERR) {
+                dev_err(&pdev->dev, "emc rx bus error\n");
+                w90p910_reset_mac(dev);
+        }
+
+        netdev_rx(dev);
+        return IRQ_HANDLED;
+}
+
+static int w90p910_ether_open(struct net_device *dev)
+{
+        struct w90p910_ether *ether;
+        struct platform_device *pdev;
+
+        ether = netdev_priv(dev);
+        pdev = ether->pdev;
+
+        w90p910_reset_mac(dev);
+        w90p910_set_fifo_threshold(dev);
+        w90p910_set_curdest(dev);
+        w90p910_enable_cam(dev);
+        w90p910_enable_cam_command(dev);
+        w90p910_enable_mac_interrupt(dev);
+        w90p910_set_global_maccmd(dev);
+        w90p910_enable_rx(dev, 1);
+
+        clk_enable(ether->rmiiclk);
+        clk_enable(ether->clk);
+
+        ether->rx_packets = 0x0;
+        ether->rx_bytes = 0x0;
+
+        if (request_irq(ether->txirq, w90p910_tx_interrupt,
+                                                0x0, pdev->name, dev)) {
+                dev_err(&pdev->dev, "register irq tx failed\n");
+                return -EAGAIN;
+        }
+
+        if (request_irq(ether->rxirq, w90p910_rx_interrupt,
+                                                0x0, pdev->name, dev)) {
+                dev_err(&pdev->dev, "register irq rx failed\n");
+                free_irq(ether->txirq, dev);
+                return -EAGAIN;
+        }
+
+        mod_timer(&ether->check_timer, jiffies + msecs_to_jiffies(1000));
+        netif_start_queue(dev);
+        w90p910_trigger_rx(dev);
+
+        dev_info(&pdev->dev, "%s is OPENED\n", dev->name);
+
+        return 0;
+}
+
+static void w90p910_ether_set_multicast_list(struct net_device *dev)
+{
+        struct w90p910_ether *ether;
+        unsigned int rx_mode;
+
+        ether = netdev_priv(dev);
+
+        if (dev->flags & IFF_PROMISC)
+                rx_mode = CAMCMR_AUP | CAMCMR_AMP | CAMCMR_ABP | CAMCMR_ECMP;
+        else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev))
+                rx_mode = CAMCMR_AMP | CAMCMR_ABP | CAMCMR_ECMP;
+        else
+                rx_mode = CAMCMR_ECMP | CAMCMR_ABP;
+        __raw_writel(rx_mode, ether->reg + REG_CAMCMR);
+}
+
+static int w90p910_ether_ioctl(struct net_device *dev,
+                                                struct ifreq *ifr, int cmd)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        struct mii_ioctl_data *data = if_mii(ifr);
+
+        return generic_mii_ioctl(&ether->mii, data, cmd, NULL);
+}
+
+static void w90p910_get_drvinfo(struct net_device *dev,
+                                        struct ethtool_drvinfo *info)
+{
+        strcpy(info->driver, DRV_MODULE_NAME);
+        strcpy(info->version, DRV_MODULE_VERSION);
+}
+
+static int w90p910_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        return mii_ethtool_gset(&ether->mii, cmd);
+}
+
+static int w90p910_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        return mii_ethtool_sset(&ether->mii, cmd);
+}
+
+static int w90p910_nway_reset(struct net_device *dev)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        return mii_nway_restart(&ether->mii);
+}
+
+static u32 w90p910_get_link(struct net_device *dev)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        return mii_link_ok(&ether->mii);
+}
+
+static const struct ethtool_ops w90p910_ether_ethtool_ops = {
+        .get_settings   = w90p910_get_settings,
+        .set_settings   = w90p910_set_settings,
+        .get_drvinfo    = w90p910_get_drvinfo,
+        .nway_reset     = w90p910_nway_reset,
+        .get_link       = w90p910_get_link,
+};
+
+static const struct net_device_ops w90p910_ether_netdev_ops = {
+        .ndo_open               = w90p910_ether_open,
+        .ndo_stop               = w90p910_ether_close,
+        .ndo_start_xmit         = w90p910_ether_start_xmit,
+        .ndo_get_stats          = w90p910_ether_stats,
+        .ndo_set_multicast_list = w90p910_ether_set_multicast_list,
+        .ndo_set_mac_address    = w90p910_set_mac_address,
+        .ndo_do_ioctl           = w90p910_ether_ioctl,
+        .ndo_validate_addr      = eth_validate_addr,
+        .ndo_change_mtu         = eth_change_mtu,
+};
+
+static void __init get_mac_address(struct net_device *dev)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+        struct platform_device *pdev;
+        char addr[6];
+
+        pdev = ether->pdev;
+
+        addr[0] = 0x00;
+        addr[1] = 0x02;
+        addr[2] = 0xac;
+        addr[3] = 0x55;
+        addr[4] = 0x88;
+        addr[5] = 0xa8;
+
+        if (is_valid_ether_addr(addr))
+                memcpy(dev->dev_addr, &addr, 0x06);
+        else
+                dev_err(&pdev->dev, "invalid mac address\n");
+}
+
+static int w90p910_ether_setup(struct net_device *dev)
+{
+        struct w90p910_ether *ether = netdev_priv(dev);
+
+        ether_setup(dev);
+        dev->netdev_ops = &w90p910_ether_netdev_ops;
+        dev->ethtool_ops = &w90p910_ether_ethtool_ops;
+
+        dev->tx_queue_len = 16;
+        dev->dma = 0x0;
+        dev->watchdog_timeo = TX_TIMEOUT;
+
+        get_mac_address(dev);
+
+        ether->cur_tx = 0x0;
+        ether->cur_rx = 0x0;
+        ether->finish_tx = 0x0;
+        ether->linkflag = 0x0;
+        ether->mii.phy_id = 0x01;
+        ether->mii.phy_id_mask = 0x1f;
+        ether->mii.reg_num_mask = 0x1f;
+        ether->mii.dev = dev;
+        ether->mii.mdio_read = w90p910_mdio_read;
+        ether->mii.mdio_write = w90p910_mdio_write;
+
+        setup_timer(&ether->check_timer, w90p910_check_link,
+                                                (unsigned long)dev);
+
+        return 0;
+}
+
+static int __devinit w90p910_ether_probe(struct platform_device *pdev)
+{
+        struct w90p910_ether *ether;
+        struct net_device *dev;
+        int error;
+
+        dev = alloc_etherdev(sizeof(struct w90p910_ether));
+        if (!dev)
+                return -ENOMEM;
+
+        ether = netdev_priv(dev);
+
+        ether->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (ether->res == NULL) {
+                dev_err(&pdev->dev, "failed to get I/O memory\n");
+                error = -ENXIO;
+                goto failed_free;
+        }
+
+        if (!request_mem_region(ether->res->start,
+                                resource_size(ether->res), pdev->name)) {
+                dev_err(&pdev->dev, "failed to request I/O memory\n");
+                error = -EBUSY;
+                goto failed_free;
+        }
+
+        ether->reg = ioremap(ether->res->start, resource_size(ether->res));
+        if (ether->reg == NULL) {
+                dev_err(&pdev->dev, "failed to remap I/O memory\n");
+                error = -ENXIO;
+                goto failed_free_mem;
+        }
+
+        ether->txirq = platform_get_irq(pdev, 0);
+        if (ether->txirq < 0) {
+                dev_err(&pdev->dev, "failed to get ether tx irq\n");
+                error = -ENXIO;
+                goto failed_free_io;
+        }
+
+        ether->rxirq = platform_get_irq(pdev, 1);
+        if (ether->rxirq < 0) {
+                dev_err(&pdev->dev, "failed to get ether rx irq\n");
+                error = -ENXIO;
+                goto failed_free_txirq;
+        }
+
+        platform_set_drvdata(pdev, dev);
+
+        ether->clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(ether->clk)) {
+                dev_err(&pdev->dev, "failed to get ether clock\n");
+                error = PTR_ERR(ether->clk);
+                goto failed_free_rxirq;
+        }
+
+        ether->rmiiclk = clk_get(&pdev->dev, "RMII");
+        if (IS_ERR(ether->rmiiclk)) {
+                dev_err(&pdev->dev, "failed to get ether clock\n");
+                error = PTR_ERR(ether->rmiiclk);
+                goto failed_put_clk;
+        }
+
+        ether->pdev = pdev;
+
+        w90p910_ether_setup(dev);
+
+        error = register_netdev(dev);
+        if (error != 0) {
+                dev_err(&pdev->dev, "Regiter EMC w90p910 FAILED\n");
+                error = -ENODEV;
+                goto failed_put_rmiiclk;
+        }
+
+        return 0;
+failed_put_rmiiclk:
+        clk_put(ether->rmiiclk);
+failed_put_clk:
+        clk_put(ether->clk);
+failed_free_rxirq:
+        free_irq(ether->rxirq, pdev);
+        platform_set_drvdata(pdev, NULL);
+failed_free_txirq:
+        free_irq(ether->txirq, pdev);
+failed_free_io:
+        iounmap(ether->reg);
+failed_free_mem:
+        release_mem_region(ether->res->start, resource_size(ether->res));
+failed_free:
+        free_netdev(dev);
+        return error;
+}
+
+static int __devexit w90p910_ether_remove(struct platform_device *pdev)
+{
+        struct net_device *dev = platform_get_drvdata(pdev);
+        struct w90p910_ether *ether = netdev_priv(dev);
+
+        unregister_netdev(dev);
+
+        clk_put(ether->rmiiclk);
+        clk_put(ether->clk);
+
+        iounmap(ether->reg);
+        release_mem_region(ether->res->start, resource_size(ether->res));
+
+        free_irq(ether->txirq, dev);
+        free_irq(ether->rxirq, dev);
+
+        del_timer_sync(&ether->check_timer);
+        platform_set_drvdata(pdev, NULL);
+
+        free_netdev(dev);
+        return 0;
+}
+
+static struct platform_driver w90p910_ether_driver = {
+        .probe          = w90p910_ether_probe,
+        .remove         = __devexit_p(w90p910_ether_remove),
+        .driver         = {
+                .name   = "nuc900-emc",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init w90p910_ether_init(void)
+{
+        return platform_driver_register(&w90p910_ether_driver);
+}
+
+static void __exit w90p910_ether_exit(void)
+{
+        platform_driver_unregister(&w90p910_ether_driver);
+}
+
+module_init(w90p910_ether_init);
+module_exit(w90p910_ether_exit);
+
+MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
+MODULE_DESCRIPTION("w90p910 MAC driver!");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:nuc900-emc");
+