Add mac driver for w90p910
authorWan ZongShun <mcuos.com@gmail.com>
Thu, 16 Jul 2009 02:55:05 +0000 (02:55 +0000)
committerDavid S. Miller <davem@davemloft.net>
Mon, 20 Jul 2009 14:45:05 +0000 (07:45 -0700)
Add mac driver support for evaluation board based on w90p910.

Signed-off-by: Wan ZongShun <mcuos.com@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/arm/Kconfig
drivers/net/arm/Makefile
drivers/net/arm/w90p910_ether.c [new file with mode: 0644]

index 2895db13bfa4459cebc86b89c2e7dc1fc5971495..c37ee9e6b67b93c989de07689c0c47bad7150d50 100644 (file)
@@ -63,3 +63,11 @@ config IXP4XX_ETH
        help
          Say Y here if you want to use built-in Ethernet ports
          on IXP4xx processor.
+
+config W90P910_ETH
+       tristate "Nuvoton w90p910 Ethernet support"
+       depends on ARM && ARCH_W90X900
+       select PHYLIB
+       help
+         Say Y here if you want to use built-in Ethernet ports
+         on w90p910 processor.
index 811a3ccd14c107c56136af8884022f7cd9f4498f..303171f589e61f2379587f9d13ddbc4b416263e6 100644 (file)
@@ -11,3 +11,4 @@ obj-$(CONFIG_ARM_AT91_ETHER)  += at91_ether.o
 obj-$(CONFIG_ARM_KS8695_ETHER) += ks8695net.o
 obj-$(CONFIG_EP93XX_ETH)       += ep93xx_eth.o
 obj-$(CONFIG_IXP4XX_ETH)       += ixp4xx_eth.o
+obj-$(CONFIG_W90P910_ETH)      += w90p910_ether.o
diff --git a/drivers/net/arm/w90p910_ether.c b/drivers/net/arm/w90p910_ether.c
new file mode 100644 (file)
index 0000000..616fb79
--- /dev/null
@@ -0,0 +1,1105 @@
+/*
+ * 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>
+
+#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             50
+#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[RX_DESC_SIZE][MAX_TBUFF_SZ];
+};
+
+struct  w90p910_ether {
+       struct recv_pdesc *rdesc;
+       struct recv_pdesc *rdesc_phys;
+       struct tran_pdesc *tdesc;
+       struct tran_pdesc *tdesc_phys;
+       struct net_device_stats stats;
+       struct platform_device *pdev;
+       struct sk_buff *skb;
+       struct clk *clk;
+       struct clk *rmiiclk;
+       struct mii_if_info mii;
+       struct timer_list check_timer;
+       void __iomem *reg;
+       unsigned int rxirq;
+       unsigned 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;
+       spinlock_t lock;
+};
+
+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 void w90p910_init_desc(struct net_device *dev)
+{
+       struct w90p910_ether *ether;
+       struct w90p910_txbd  *tdesc, *tdesc_phys;
+       struct w90p910_rxbd  *rdesc, *rdesc_phys;
+       unsigned int i, j;
+
+       ether = netdev_priv(dev);
+
+       ether->tdesc = (struct tran_pdesc *)
+                       dma_alloc_coherent(NULL, sizeof(struct tran_pdesc),
+                               (dma_addr_t *) &ether->tdesc_phys, GFP_KERNEL);
+
+       ether->rdesc = (struct recv_pdesc *)
+                       dma_alloc_coherent(NULL, sizeof(struct recv_pdesc),
+                               (dma_addr_t *) &ether->rdesc_phys, GFP_KERNEL);
+
+       for (i = 0; i < TX_DESC_SIZE; i++) {
+               tdesc = &(ether->tdesc->desclist[i]);
+
+               j = ((i + 1) / TX_DESC_SIZE);
+
+               if (j != 0) {
+                       tdesc_phys = &(ether->tdesc_phys->desclist[0]);
+                       ether->start_tx_ptr = (unsigned int)tdesc_phys;
+                       tdesc->next = (unsigned int)ether->start_tx_ptr;
+               } else {
+                       tdesc_phys = &(ether->tdesc_phys->desclist[i+1]);
+                       tdesc->next = (unsigned int)tdesc_phys;
+               }
+
+               tdesc->buffer = (unsigned int)ether->tdesc_phys->tran_buf[i];
+               tdesc->sl = 0;
+               tdesc->mode = 0;
+       }
+
+       for (i = 0; i < RX_DESC_SIZE; i++) {
+               rdesc = &(ether->rdesc->desclist[i]);
+
+               j = ((i + 1) / RX_DESC_SIZE);
+
+               if (j != 0) {
+                       rdesc_phys = &(ether->rdesc_phys->desclist[0]);
+                       ether->start_rx_ptr = (unsigned int)rdesc_phys;
+                       rdesc->next = (unsigned int)ether->start_rx_ptr;
+               } else {
+                       rdesc_phys = &(ether->rdesc_phys->desclist[i+1]);
+                       rdesc->next = (unsigned int)rdesc_phys;
+               }
+
+               rdesc->sl = RX_OWEN_DMA;
+               rdesc->buffer = (unsigned int)ether->rdesc_phys->recv_buf[i];
+         }
+}
+
+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);
+
+       spin_lock(&ether->lock);
+
+       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;
+       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;
+
+       if (netif_queue_stopped(dev))
+               netif_wake_queue(dev);
+
+       spin_unlock(&ether->lock);
+}
+
+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 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);
+
+       dma_free_writecombine(NULL, sizeof(struct w90p910_rxbd),
+                               ether->rdesc, (dma_addr_t)ether->rdesc_phys);
+       dma_free_writecombine(NULL, sizeof(struct w90p910_txbd),
+                               ether->tdesc, (dma_addr_t)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);
+
+       ether->cur_tx = (ether->cur_tx+1) % TX_DESC_SIZE;
+       txbd = &ether->tdesc->desclist[ether->cur_tx];
+
+       dev->trans_start = jiffies;
+
+       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 -1;
+}
+
+static irqreturn_t w90p910_tx_interrupt(int irq, void *dev_id)
+{
+       struct w90p910_ether *ether;
+       struct w90p910_txbd  *txbd;
+       struct platform_device *pdev;
+       struct tran_pdesc *tran_pdesc;
+       struct net_device *dev;
+       unsigned int cur_entry, entry, status;
+
+       dev = (struct net_device *)dev_id;
+       ether = netdev_priv(dev);
+       pdev = ether->pdev;
+
+       spin_lock(&ether->lock);
+
+       w90p910_get_and_clear_int(dev, &status);
+
+       cur_entry = __raw_readl(ether->reg + REG_CTXDSA);
+
+       tran_pdesc = ether->tdesc_phys;
+       entry = (unsigned int)(&tran_pdesc->desclist[ether->finish_tx]);
+
+       while (entry != cur_entry) {
+               txbd = &ether->tdesc->desclist[ether->finish_tx];
+
+               ether->finish_tx = (ether->finish_tx + 1) % TX_DESC_SIZE;
+
+               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 = (unsigned int)(&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);
+                       }
+
+       spin_unlock(&ether->lock);
+
+       return IRQ_HANDLED;
+}
+
+static void netdev_rx(struct net_device *dev)
+{
+       struct w90p910_ether *ether;
+       struct w90p910_rxbd *rxbd;
+       struct platform_device *pdev;
+       struct recv_pdesc *rdesc_phys;
+       struct sk_buff *skb;
+       unsigned char *data;
+       unsigned int length, status, val, entry;
+
+       ether = netdev_priv(dev);
+       pdev = ether->pdev;
+       rdesc_phys = ether->rdesc_phys;
+
+       rxbd = &ether->rdesc->desclist[ether->cur_rx];
+
+       do {
+               val = __raw_readl(ether->reg + REG_CRXDSA);
+               entry = (unsigned int)&rdesc_phys->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->dev = dev;
+                       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++;
+                               }
+
+                       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;
+               ether->cur_rx = (ether->cur_rx+1) % RX_DESC_SIZE;
+               rxbd = &ether->rdesc->desclist[ether->cur_rx];
+
+               dev->last_rx = jiffies;
+       } 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 = (struct net_device *)dev_id;
+       ether = netdev_priv(dev);
+       pdev = ether->pdev;
+
+       spin_lock(&ether->lock);
+
+       w90p910_get_and_clear_int(dev, &status);
+
+       if (status & MISTA_RDU) {
+               netdev_rx(dev);
+
+               w90p910_trigger_rx(dev);
+
+               spin_unlock(&ether->lock);
+               return IRQ_HANDLED;
+       } else if (status & MISTA_RXBERR) {
+                       dev_err(&pdev->dev, "emc rx bus error\n");
+                       w90p910_reset_mac(dev);
+               }
+
+       netdev_rx(dev);
+       spin_unlock(&ether->lock);
+       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);
+
+       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");
+               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) || dev->mc_list)
+                       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    = 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);
+
+       spin_lock_init(&ether->lock);
+
+       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;
+       struct resource *res;
+       int error;
+
+       dev = alloc_etherdev(sizeof(struct w90p910_ether));
+       if (!dev)
+               return -ENOMEM;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (res == NULL) {
+               dev_err(&pdev->dev, "failed to get I/O memory\n");
+               error = -ENXIO;
+               goto failed_free;
+       }
+
+       res = request_mem_region(res->start, resource_size(res), pdev->name);
+       if (res == NULL) {
+               dev_err(&pdev->dev, "failed to request I/O memory\n");
+               error = -EBUSY;
+               goto failed_free;
+       }
+
+       ether = netdev_priv(dev);
+
+       ether->reg = ioremap(res->start, resource_size(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(res->start, resource_size(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);
+       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   = "w90p910-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:w90p910-emc");
+