[NET]: Add support for the RDC R6040 Fast Ethernet controller

This patch adds support for the RDC R6040 MAC we can find in the RDC
R-321x System-on-chips.

Signed-off-by: Sten Wang <sten.wang@rdc.com.tw>
Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
Signed-off-by: Florian Fainelli <florian.fainelli@telecomint.eu>

3 files changed, 1122 insertions, 0 deletions

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 777bb81d9ada..7ae9024b5833 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -1584,6 +1584,18 @@ config 8139_OLD_RX_RESET
           experience problems, you can enable this option to restore the
           old RX-reset behavior.  If unsure, say N.
 
+config R6040
+        tristate "RDC R6040 Fast Ethernet Adapter support (EXPERIMENTAL)"
+        depends on NET_PCI && PCI
+        select CRC32
+        select MII
+        help
+          This is a driver for the R6040 Fast Ethernet MACs found in the
+          the RDC R-321x System-on-chips.
+
+          To compile this driver as a module, choose M here: the module
+          will be called r6040. This is recommended.
+
 config SIS900
         tristate "SiS 900/7016 PCI Fast Ethernet Adapter support"
         depends on NET_PCI && PCI
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index a2f2662c244b..5dd2d5eb1918 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -55,6 +55,7 @@ obj-$(CONFIG_TLAN) += tlan.o
 obj-$(CONFIG_EPIC100) += epic100.o
 obj-$(CONFIG_SIS190) += sis190.o
 obj-$(CONFIG_SIS900) += sis900.o
+obj-$(CONFIG_R6040) += r6040.o
 obj-$(CONFIG_YELLOWFIN) += yellowfin.o
 obj-$(CONFIG_ACENIC) += acenic.o
 obj-$(CONFIG_ISERIES_VETH) += iseries_veth.o
diff --git a/drivers/net/r6040.c b/drivers/net/r6040.c
new file mode 100644
index 000000000000..edce5a4c7f20
--- /dev/null
+++ b/drivers/net/r6040.c
@@ -0,0 +1,1109 @@
+/*
+ * RDC R6040 Fast Ethernet MAC support
+ *
+ * Copyright (C) 2004 Sten Wang <sten.wang@rdc.com.tw>
+ * Copyright (C) 2007
+ *      Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+ *      Florian Fainelli <florian@openwrt.org>
+ *
+ * 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., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+*/
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/moduleparam.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/mii.h>
+#include <linux/ethtool.h>
+#include <linux/crc32.h>
+#include <linux/spinlock.h>
+
+#include <asm/processor.h>
+#include <asm/bitops.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+
+#define DRV_NAME        "r6040"
+#define DRV_VERSION     "0.16"
+#define DRV_RELDATE     "10Nov2007"
+
+/* PHY CHIP Address */
+#define PHY1_ADDR       1       /* For MAC1 */
+#define PHY2_ADDR       2       /* For MAC2 */
+#define PHY_MODE        0x3100  /* PHY CHIP Register 0 */
+#define PHY_CAP         0x01E1  /* PHY CHIP Register 4 */
+
+/* Time in jiffies before concluding the transmitter is hung. */
+#define TX_TIMEOUT      (6000 * HZ / 1000)
+#define TIMER_WUT       (jiffies + HZ * 1)/* timer wakeup time : 1 second */
+
+/* RDC MAC I/O Size */
+#define R6040_IO_SIZE   256
+
+/* MAX RDC MAC */
+#define MAX_MAC         2
+
+/* MAC registers */
+#define MCR0            0x00    /* Control register 0 */
+#define MCR1            0x04    /* Control register 1 */
+#define  MAC_RST        0x0001  /* Reset the MAC */
+#define MBCR            0x08    /* Bus control */
+#define MT_ICR          0x0C    /* TX interrupt control */
+#define MR_ICR          0x10    /* RX interrupt control */
+#define MTPR            0x14    /* TX poll command register */
+#define MR_BSR          0x18    /* RX buffer size */
+#define MR_DCR          0x1A    /* RX descriptor control */
+#define MLSR            0x1C    /* Last status */
+#define MMDIO           0x20    /* MDIO control register */
+#define  MDIO_WRITE     0x4000  /* MDIO write */
+#define  MDIO_READ      0x2000  /* MDIO read */
+#define MMRD            0x24    /* MDIO read data register */
+#define MMWD            0x28    /* MDIO write data register */
+#define MTD_SA0         0x2C    /* TX descriptor start address 0 */
+#define MTD_SA1         0x30    /* TX descriptor start address 1 */
+#define MRD_SA0         0x34    /* RX descriptor start address 0 */
+#define MRD_SA1         0x38    /* RX descriptor start address 1 */
+#define MISR            0x3C    /* Status register */
+#define MIER            0x40    /* INT enable register */
+#define  MSK_INT        0x0000  /* Mask off interrupts */
+#define ME_CISR         0x44    /* Event counter INT status */
+#define ME_CIER         0x48    /* Event counter INT enable  */
+#define MR_CNT          0x50    /* Successfully received packet counter */
+#define ME_CNT0         0x52    /* Event counter 0 */
+#define ME_CNT1         0x54    /* Event counter 1 */
+#define ME_CNT2         0x56    /* Event counter 2 */
+#define ME_CNT3         0x58    /* Event counter 3 */
+#define MT_CNT          0x5A    /* Successfully transmit packet counter */
+#define ME_CNT4         0x5C    /* Event counter 4 */
+#define MP_CNT          0x5E    /* Pause frame counter register */
+#define MAR0            0x60    /* Hash table 0 */
+#define MAR1            0x62    /* Hash table 1 */
+#define MAR2            0x64    /* Hash table 2 */
+#define MAR3            0x66    /* Hash table 3 */
+#define MID_0L          0x68    /* Multicast address MID0 Low */
+#define MID_0M          0x6A    /* Multicast address MID0 Medium */
+#define MID_0H          0x6C    /* Multicast address MID0 High */
+#define MID_1L          0x70    /* MID1 Low */
+#define MID_1M          0x72    /* MID1 Medium */
+#define MID_1H          0x74    /* MID1 High */
+#define MID_2L          0x78    /* MID2 Low */
+#define MID_2M          0x7A    /* MID2 Medium */
+#define MID_2H          0x7C    /* MID2 High */
+#define MID_3L          0x80    /* MID3 Low */
+#define MID_3M          0x82    /* MID3 Medium */
+#define MID_3H          0x84    /* MID3 High */
+#define PHY_CC          0x88    /* PHY status change configuration register */
+#define PHY_ST          0x8A    /* PHY status register */
+#define MAC_SM          0xAC    /* MAC status machine */
+#define MAC_ID          0xBE    /* Identifier register */
+
+#define TX_DCNT         0x80    /* TX descriptor count */
+#define RX_DCNT         0x80    /* RX descriptor count */
+#define MAX_BUF_SIZE    0x600
+#define ALLOC_DESC_SIZE ((TX_DCNT+RX_DCNT) * \
+        sizeof(struct r6040_descriptor) + 0x10)
+#define MBCR_DEFAULT    0x012A  /* MAC Bus Control Register */
+#define MCAST_MAX       4       /* Max number multicast addresses to filter */
+
+/* PHY settings */
+#define ICPLUS_PHY_ID   0x0243
+
+MODULE_AUTHOR("Sten Wang <sten.wang@rdc.com.tw>,"
+        "Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>,"
+        "Florian Fainelli <florian@openwrt.org>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("RDC R6040 NAPI PCI FastEthernet driver");
+
+#define RX_INT                         0x0001
+#define TX_INT                         0x0010
+#define RX_NO_DESC_INT                 0x0002
+#define INT_MASK                 (RX_INT | TX_INT)
+
+struct r6040_descriptor {
+        u16     status, len;            /* 0-3 */
+        __le32  buf;                    /* 4-7 */
+        __le32  ndesc;                  /* 8-B */
+        u32     rev1;                   /* C-F */
+        char    *vbufp;                 /* 10-13 */
+        struct r6040_descriptor *vndescp;       /* 14-17 */
+        struct sk_buff *skb_ptr;        /* 18-1B */
+        u32     rev2;                   /* 1C-1F */
+} __attribute__((aligned(32)));
+
+struct r6040_private {
+        spinlock_t lock;                /* driver lock */
+        struct timer_list timer;
+        struct pci_dev *pdev;
+        struct r6040_descriptor *rx_insert_ptr;
+        struct r6040_descriptor *rx_remove_ptr;
+        struct r6040_descriptor *tx_insert_ptr;
+        struct r6040_descriptor *tx_remove_ptr;
+        u16     tx_free_desc, rx_free_desc, phy_addr, phy_mode;
+        u16     mcr0, mcr1;
+        dma_addr_t desc_dma;
+        char    *desc_pool;
+        u16     switch_sig;
+        struct net_device *dev;
+        struct mii_if_info mii_if;
+        struct napi_struct napi;
+        struct net_device_stats stats;
+        u16     napi_rx_running;
+        void __iomem *base;
+};
+
+static char version[] __devinitdata = KERN_INFO DRV_NAME
+        ": RDC R6040 NAPI net driver,"
+        "version "DRV_VERSION " (" DRV_RELDATE ")\n";
+
+static int phy_table[] = { PHY1_ADDR, PHY2_ADDR};
+
+/* Read a word data from PHY Chip */
+static int phy_read(void __iomem *ioaddr, int phy_addr, int reg)
+{
+        int limit = 2048;
+        u16 cmd;
+
+        iowrite16(MDIO_READ + reg + (phy_addr << 8), ioaddr + MMDIO);
+        /* Wait for the read bit to be cleared */
+        while (limit--) {
+                cmd = ioread16(ioaddr + MMDIO);
+                if (cmd & MDIO_READ)
+                        break;
+        }
+
+        return ioread16(ioaddr + MMRD);
+}
+
+/* Write a word data from PHY Chip */
+static void phy_write(void __iomem *ioaddr, int phy_addr, int reg, u16 val)
+{
+        int limit = 2048;
+        u16 cmd;
+
+        iowrite16(val, ioaddr + MMWD);
+        /* Write the command to the MDIO bus */
+        iowrite16(MDIO_WRITE + reg + (phy_addr << 8), ioaddr + MMDIO);
+        /* Wait for the write bit to be cleared */
+        while (limit--) {
+                cmd = ioread16(ioaddr + MMDIO);
+                if (cmd & MDIO_WRITE)
+                        break;
+        }
+}
+
+static int mdio_read(struct net_device *dev, int mii_id, int reg)
+{
+        struct r6040_private *lp = netdev_priv(dev);
+        void __iomem *ioaddr = lp->base;
+
+        return (phy_read(ioaddr, lp->phy_addr, reg));
+}
+
+static void mdio_write(struct net_device *dev, int mii_id, int reg, int val)
+{
+        struct r6040_private *lp = netdev_priv(dev);
+        void __iomem *ioaddr = lp->base;
+
+        phy_write(ioaddr, lp->phy_addr, reg, val);
+}
+
+static void
+r6040_tx_timeout(struct net_device *dev)
+{
+        struct r6040_private *priv = netdev_priv(dev);
+
+        disable_irq(dev->irq);
+        napi_disable(&priv->napi);
+        spin_lock(&priv->lock);
+        dev->stats.tx_errors++;
+        spin_unlock(&priv->lock);
+
+        netif_stop_queue(dev);
+}
+
+/* Allocate skb buffer for rx descriptor */
+static void rx_buf_alloc(struct r6040_private *lp, struct net_device *dev)
+{
+        struct r6040_descriptor *descptr;
+        void __iomem *ioaddr = lp->base;
+
+        descptr = lp->rx_insert_ptr;
+        while (lp->rx_free_desc < RX_DCNT) {
+                descptr->skb_ptr = dev_alloc_skb(MAX_BUF_SIZE);
+
+                if (!descptr->skb_ptr)
+                        break;
+                descptr->buf = cpu_to_le32(pci_map_single(lp->pdev,
+                        descptr->skb_ptr->tail,
+                        MAX_BUF_SIZE, PCI_DMA_FROMDEVICE));
+                descptr->status = 0x8000;
+                descptr = descptr->vndescp;
+                lp->rx_free_desc++;
+                /* Trigger RX DMA */
+                iowrite16(lp->mcr0 | 0x0002, ioaddr);
+        }
+        lp->rx_insert_ptr = descptr;
+}
+
+
+static struct net_device_stats *r6040_get_stats(struct net_device *dev)
+{
+        struct r6040_private *priv = netdev_priv(dev);
+        void __iomem *ioaddr = priv->base;
+        unsigned long flags;
+
+        spin_lock_irqsave(&priv->lock, flags);
+        priv->stats.rx_crc_errors += ioread8(ioaddr + ME_CNT1);
+        priv->stats.multicast += ioread8(ioaddr + ME_CNT0);
+        spin_unlock_irqrestore(&priv->lock, flags);
+
+        return &priv->stats;
+}
+
+/* Stop RDC MAC and Free the allocated resource */
+static void r6040_down(struct net_device *dev)
+{
+        struct r6040_private *lp = netdev_priv(dev);
+        void __iomem *ioaddr = lp->base;
+        int i;
+        int limit = 2048;
+        u16 *adrp;
+        u16 cmd;
+
+        /* Stop MAC */
+        iowrite16(MSK_INT, ioaddr + MIER);      /* Mask Off Interrupt */
+        iowrite16(MAC_RST, ioaddr + MCR1);      /* Reset RDC MAC */
+        while (limit--) {
+                cmd = ioread16(ioaddr + MCR1);
+                if (cmd & 0x1)
+                        break;
+        }
+
+        /* Restore MAC Address to MIDx */
+        adrp = (u16 *) dev->dev_addr;
+        iowrite16(adrp[0], ioaddr + MID_0L);
+        iowrite16(adrp[1], ioaddr + MID_0M);
+        iowrite16(adrp[2], ioaddr + MID_0H);
+        free_irq(dev->irq, dev);
+        /* Free RX buffer */
+        for (i = 0; i < RX_DCNT; i++) {
+                if (lp->rx_insert_ptr->skb_ptr) {
+                        pci_unmap_single(lp->pdev, lp->rx_insert_ptr->buf,
+                                MAX_BUF_SIZE, PCI_DMA_FROMDEVICE);
+                        dev_kfree_skb(lp->rx_insert_ptr->skb_ptr);
+                        lp->rx_insert_ptr->skb_ptr = NULL;
+                }
+                lp->rx_insert_ptr = lp->rx_insert_ptr->vndescp;
+        }
+
+        /* Free TX buffer */
+        for (i = 0; i < TX_DCNT; i++) {
+                if (lp->tx_insert_ptr->skb_ptr) {
+                        pci_unmap_single(lp->pdev, lp->tx_insert_ptr->buf,
+                                MAX_BUF_SIZE, PCI_DMA_TODEVICE);
+                        dev_kfree_skb(lp->tx_insert_ptr->skb_ptr);
+                        lp->rx_insert_ptr->skb_ptr = NULL;
+                }
+                lp->tx_insert_ptr = lp->tx_insert_ptr->vndescp;
+        }
+
+        /* Free Descriptor memory */
+        pci_free_consistent(lp->pdev, ALLOC_DESC_SIZE,
+                lp->desc_pool, lp->desc_dma);
+}
+
+static int
+r6040_close(struct net_device *dev)
+{
+        struct r6040_private *lp = netdev_priv(dev);
+
+        /* deleted timer */
+        del_timer_sync(&lp->timer);
+
+        spin_lock_irq(&lp->lock);
+        netif_stop_queue(dev);
+        r6040_down(dev);
+        spin_unlock_irq(&lp->lock);
+
+        return 0;
+}
+
+/* Status of PHY CHIP */
+static int phy_mode_chk(struct net_device *dev)
+{
+        struct r6040_private *lp = netdev_priv(dev);
+        void __iomem *ioaddr = lp->base;
+        int phy_dat;
+
+        /* PHY Link Status Check */
+        phy_dat = phy_read(ioaddr, lp->phy_addr, 1);
+        if (!(phy_dat & 0x4))
+                phy_dat = 0x8000;       /* Link Failed, full duplex */
+
+        /* PHY Chip Auto-Negotiation Status */
+        phy_dat = phy_read(ioaddr, lp->phy_addr, 1);
+        if (phy_dat & 0x0020) {
+                /* Auto Negotiation Mode */
+                phy_dat = phy_read(ioaddr, lp->phy_addr, 5);
+                phy_dat &= phy_read(ioaddr, lp->phy_addr, 4);
+                if (phy_dat & 0x140)
+                        /* Force full duplex */
+                        phy_dat = 0x8000;
+                else
+                        phy_dat = 0;
+        } else {
+                /* Force Mode */
+                phy_dat = phy_read(ioaddr, lp->phy_addr, 0);
+                if (phy_dat & 0x100)
+                        phy_dat = 0x8000;
+                else
+                        phy_dat = 0x0000;
+        }
+
+        return phy_dat;
+};
+
+static void r6040_set_carrier(struct mii_if_info *mii)
+{
+        if (phy_mode_chk(mii->dev)) {
+                /* autoneg is off: Link is always assumed to be up */
+                if (!netif_carrier_ok(mii->dev))
+                        netif_carrier_on(mii->dev);
+        } else
+                phy_mode_chk(mii->dev);
+}
+
+static int r6040_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+        struct r6040_private *lp = netdev_priv(dev);
+        struct mii_ioctl_data *data = (struct mii_ioctl_data *) &rq->ifr_data;
+        int rc;
+
+        if (!netif_running(dev))
+                return -EINVAL;
+        spin_lock_irq(&lp->lock);
+        rc = generic_mii_ioctl(&lp->mii_if, data, cmd, NULL);
+        spin_unlock_irq(&lp->lock);
+        r6040_set_carrier(&lp->mii_if);
+        return rc;
+}
+
+static int r6040_rx(struct net_device *dev, int limit)
+{
+        struct r6040_private *priv = netdev_priv(dev);
+        int count;
+        void __iomem *ioaddr = priv->base;
+        u16 err;
+
+        for (count = 0; count < limit; ++count) {
+                struct r6040_descriptor *descptr = priv->rx_remove_ptr;
+                struct sk_buff *skb_ptr;
+
+                /* Disable RX interrupt */
+                iowrite16(ioread16(ioaddr + MIER) & (~RX_INT), ioaddr + MIER);
+                descptr = priv->rx_remove_ptr;
+
+                /* Check for errors */
+                err = ioread16(ioaddr + MLSR);
+                if (err & 0x0400) priv->stats.rx_errors++;
+                /* RX FIFO over-run */
+                if (err & 0x8000) priv->stats.rx_fifo_errors++;
+                /* RX descriptor unavailable */
+                if (err & 0x0080) priv->stats.rx_frame_errors++;
+                /* Received packet with length over buffer lenght */
+                if (err & 0x0020) priv->stats.rx_over_errors++;
+                /* Received packet with too long or short */
+                if (err & (0x0010|0x0008)) priv->stats.rx_length_errors++;
+                /* Received packet with CRC errors */
+                if (err & 0x0004) {
+                        spin_lock(&priv->lock);
+                        priv->stats.rx_crc_errors++;
+                        spin_unlock(&priv->lock);
+                }
+
+                while (priv->rx_free_desc) {
+                        /* No RX packet */
+                        if (descptr->status & 0x8000)
+                                break;
+                        skb_ptr = descptr->skb_ptr;
+                        if (!skb_ptr) {
+                                printk(KERN_ERR "%s: Inconsistent RX"
+                                        "descriptor chain\n",
+                                        dev->name);
+                                break;
+                        }
+                        descptr->skb_ptr = NULL;
+                        skb_ptr->dev = priv->dev;
+                        /* Do not count the CRC */
+                        skb_put(skb_ptr, descptr->len - 4);
+                        pci_unmap_single(priv->pdev, descptr->buf,
+                                MAX_BUF_SIZE, PCI_DMA_FROMDEVICE);
+                        skb_ptr->protocol = eth_type_trans(skb_ptr, priv->dev);
+                        /* Send to upper layer */
+                        netif_receive_skb(skb_ptr);
+                        dev->last_rx = jiffies;
+                        priv->dev->stats.rx_packets++;
+                        priv->dev->stats.rx_bytes += descptr->len;
+                        /* To next descriptor */
+                        descptr = descptr->vndescp;
+                        priv->rx_free_desc--;
+                }
+                priv->rx_remove_ptr = descptr;
+        }
+        /* Allocate new RX buffer */
+        if (priv->rx_free_desc < RX_DCNT)
+                rx_buf_alloc(priv, priv->dev);
+
+        return count;
+}
+
+static void r6040_tx(struct net_device *dev)
+{
+        struct r6040_private *priv = netdev_priv(dev);
+        struct r6040_descriptor *descptr;
+        void __iomem *ioaddr = priv->base;
+        struct sk_buff *skb_ptr;
+        u16 err;
+
+        spin_lock(&priv->lock);
+        descptr = priv->tx_remove_ptr;
+        while (priv->tx_free_desc < TX_DCNT) {
+                /* Check for errors */
+                err = ioread16(ioaddr + MLSR);
+
+                if (err & 0x0200) priv->stats.rx_fifo_errors++;
+                if (err & (0x2000 | 0x4000)) priv->stats.tx_carrier_errors++;
+
+                if (descptr->status & 0x8000)
+                        break; /* Not complte */
+                skb_ptr = descptr->skb_ptr;
+                pci_unmap_single(priv->pdev, descptr->buf,
+                        skb_ptr->len, PCI_DMA_TODEVICE);
+                /* Free buffer */
+                dev_kfree_skb_irq(skb_ptr);
+                descptr->skb_ptr = NULL;
+                /* To next descriptor */
+                descptr = descptr->vndescp;
+                priv->tx_free_desc++;
+        }
+        priv->tx_remove_ptr = descptr;
+
+        if (priv->tx_free_desc)
+                netif_wake_queue(dev);
+        spin_unlock(&priv->lock);
+}
+
+static int r6040_poll(struct napi_struct *napi, int budget)
+{
+        struct r6040_private *priv =
+                container_of(napi, struct r6040_private, napi);
+        struct net_device *dev = priv->dev;
+        void __iomem *ioaddr = priv->base;
+        int work_done;
+
+        work_done = r6040_rx(dev, budget);
+
+        if (work_done < budget) {
+                netif_rx_complete(dev, napi);
+                /* Enable RX interrupt */
+                iowrite16(ioread16(ioaddr + MIER) | RX_INT, ioaddr + MIER);
+        }
+        return work_done;
+}
+
+/* The RDC interrupt handler. */
+static irqreturn_t r6040_interrupt(int irq, void *dev_id)
+{
+        struct net_device *dev = dev_id;
+        struct r6040_private *lp = netdev_priv(dev);
+        void __iomem *ioaddr = lp->base;
+        u16 status;
+        int handled = 1;
+
+        /* Mask off RDC MAC interrupt */
+        iowrite16(MSK_INT, ioaddr + MIER);
+        /* Read MISR status and clear */
+        status = ioread16(ioaddr + MISR);
+
+        if (status == 0x0000 || status == 0xffff)
+                return IRQ_NONE;
+
+        /* RX interrupt request */
+        if (status & 0x01) {
+                netif_rx_schedule(dev, &lp->napi);
+                iowrite16(TX_INT, ioaddr + MIER);
+        }
+
+        /* TX interrupt request */
+        if (status & 0x10)
+                r6040_tx(dev);
+
+        return IRQ_RETVAL(handled);
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void r6040_poll_controller(struct net_device *dev)
+{
+        disable_irq(dev->irq);
+        r6040_interrupt(dev->irq, (void *)dev);
+        enable_irq(dev->irq);
+}
+#endif
+
+
+/* Init RDC MAC */
+static void r6040_up(struct net_device *dev)
+{
+        struct r6040_private *lp = netdev_priv(dev);
+        struct r6040_descriptor *descptr;
+        void __iomem *ioaddr = lp->base;
+        int i;
+        __le32 tmp_addr;
+        dma_addr_t desc_dma, start_dma;
+
+        /* Initialize */
+        lp->tx_free_desc = TX_DCNT;
+        lp->rx_free_desc = 0;
+        /* Init descriptor */
+        memset(lp->desc_pool, 0, ALLOC_DESC_SIZE); /* Let all descriptor = 0 */
+        lp->tx_insert_ptr = (struct r6040_descriptor *)lp->desc_pool;
+        lp->tx_remove_ptr = lp->tx_insert_ptr;
+        lp->rx_insert_ptr = (struct r6040_descriptor *)lp->tx_insert_ptr +
+                TX_DCNT;
+        lp->rx_remove_ptr = lp->rx_insert_ptr;
+        /* Init TX descriptor */
+        descptr = lp->tx_insert_ptr;
+        desc_dma = lp->desc_dma;
+        start_dma = desc_dma;
+        for (i = 0; i < TX_DCNT; i++) {
+                descptr->ndesc = cpu_to_le32(desc_dma +
+                        sizeof(struct r6040_descriptor));
+                descptr->vndescp = (descptr + 1);
+                descptr = (descptr + 1);
+                desc_dma += sizeof(struct r6040_descriptor);
+        }
+        (descptr - 1)->ndesc = cpu_to_le32(start_dma);
+        (descptr - 1)->vndescp = lp->tx_insert_ptr;
+
+        /* Init RX descriptor */
+        start_dma = desc_dma;
+        descptr = lp->rx_insert_ptr;
+        for (i = 0; i < RX_DCNT; i++) {
+                descptr->ndesc = cpu_to_le32(desc_dma +
+                        sizeof(struct r6040_descriptor));
+                descptr->vndescp = (descptr + 1);
+                descptr = (descptr + 1);
+                desc_dma += sizeof(struct r6040_descriptor);
+        }
+        (descptr - 1)->ndesc = cpu_to_le32(start_dma);
+        (descptr - 1)->vndescp = lp->rx_insert_ptr;
+
+        /* Allocate buffer for RX descriptor */
+        rx_buf_alloc(lp, dev);
+
+        /* TX and RX descriptor start Register */
+        tmp_addr = cpu_to_le32((u32)lp->tx_insert_ptr);
+        tmp_addr = virt_to_bus((volatile void *)tmp_addr);
+        /* Lower 16-bits to MTD_SA0 */
+        iowrite16(tmp_addr, ioaddr + MTD_SA0);
+        /* Higher 16-bits to MTD_SA1 */
+        iowrite16((u16)(tmp_addr >> 16), ioaddr + MTD_SA1);
+        tmp_addr = cpu_to_le32((u32)lp->rx_insert_ptr);
+        tmp_addr = virt_to_bus((volatile void *)tmp_addr);
+        iowrite16(tmp_addr, ioaddr + MRD_SA0);
+        iowrite16((u16)(tmp_addr >> 16), ioaddr + MRD_SA1);
+
+        /* Buffer Size Register */
+        iowrite16(MAX_BUF_SIZE, ioaddr + MR_BSR);
+        /* Read the PHY ID */
+        lp->switch_sig = phy_read(ioaddr, 0, 2);
+
+        if (lp->switch_sig  == ICPLUS_PHY_ID) {
+                phy_write(ioaddr, 29, 31, 0x175C); /* Enable registers */
+                lp->phy_mode = 0x8000;
+        } else {
+                /* PHY Mode Check */
+                phy_write(ioaddr, lp->phy_addr, 4, PHY_CAP);
+                phy_write(ioaddr, lp->phy_addr, 0, PHY_MODE);
+
+                if (PHY_MODE == 0x3100)
+                        lp->phy_mode = phy_mode_chk(dev);
+                else
+                        lp->phy_mode = (PHY_MODE & 0x0100) ? 0x8000:0x0;
+        }
+        /* MAC Bus Control Register */
+        iowrite16(MBCR_DEFAULT, ioaddr + MBCR);
+
+        /* MAC TX/RX Enable */
+        lp->mcr0 |= lp->phy_mode;
+        iowrite16(lp->mcr0, ioaddr);
+
+        /* set interrupt waiting time and packet numbers */
+        iowrite16(0x0F06, ioaddr + MT_ICR);
+        iowrite16(0x0F06, ioaddr + MR_ICR);
+
+        /* improve performance (by RDC guys) */
+        phy_write(ioaddr, 30, 17, (phy_read(ioaddr, 30, 17) | 0x4000));
+        phy_write(ioaddr, 30, 17, ~((~phy_read(ioaddr, 30, 17)) | 0x2000));
+        phy_write(ioaddr, 0, 19, 0x0000);
+        phy_write(ioaddr, 0, 30, 0x01F0);
+
+        /* Interrupt Mask Register */
+        iowrite16(INT_MASK, ioaddr + MIER);
+}
+
+/*
+  A periodic timer routine
+        Polling PHY Chip Link Status
+*/
+static void r6040_timer(unsigned long data)
+{
+        struct net_device *dev = (struct net_device *)data;
+        struct r6040_private *lp = netdev_priv(dev->priv);
+        void __iomem *ioaddr = lp->base;
+        u16 phy_mode;
+
+        /* Polling PHY Chip Status */
+        if (PHY_MODE == 0x3100)
+                phy_mode = phy_mode_chk(dev);
+        else
+                phy_mode = (PHY_MODE & 0x0100) ? 0x8000:0x0;
+
+        if (phy_mode != lp->phy_mode) {
+                lp->phy_mode = phy_mode;
+                lp->mcr0 = (lp->mcr0 & 0x7fff) | phy_mode;
+                iowrite16(lp->mcr0, ioaddr);
+                printk(KERN_INFO "Link Change %x \n", ioread16(ioaddr));
+        }
+
+        /* Timer active again */
+        lp->timer.expires = TIMER_WUT;
+        add_timer(&lp->timer);
+}
+
+/* Read/set MAC address routines */
+static void r6040_mac_address(struct net_device *dev)
+{
+        struct r6040_private *lp = netdev_priv(dev);
+        void __iomem *ioaddr = lp->base;
+        u16 *adrp;
+
+        /* MAC operation register */
+        iowrite16(0x01, ioaddr + MCR1); /* Reset MAC */
+        iowrite16(2, ioaddr + MAC_SM); /* Reset internal state machine */
+        iowrite16(0, ioaddr + MAC_SM);
+        udelay(5000);
+
+        /* Restore MAC Address */
+        adrp = (u16 *) dev->dev_addr;
+        iowrite16(adrp[0], ioaddr + MID_0L);
+        iowrite16(adrp[1], ioaddr + MID_0M);
+        iowrite16(adrp[2], ioaddr + MID_0H);
+}
+
+static int
+r6040_open(struct net_device *dev)
+{
+        struct r6040_private *lp = dev->priv;
+        int ret;
+
+        /* Request IRQ and Register interrupt handler */
+        ret = request_irq(dev->irq, &r6040_interrupt,
+                IRQF_SHARED, dev->name, dev);
+        if (ret)
+                return ret;
+
+        /* Set MAC address */
+        r6040_mac_address(dev);
+
+        /* Allocate Descriptor memory */
+        lp->desc_pool = pci_alloc_consistent(lp->pdev,
+                ALLOC_DESC_SIZE, &lp->desc_dma);
+        if (!lp->desc_pool)
+                return -ENOMEM;
+
+        r6040_up(dev);
+
+        napi_enable(&lp->napi);
+        netif_start_queue(dev);
+
+        if (lp->switch_sig != ICPLUS_PHY_ID) {
+                /* set and active a timer process */
+                init_timer(&lp->timer);
+                lp->timer.expires = TIMER_WUT;
+                lp->timer.data = (unsigned long)dev;
+                lp->timer.function = &r6040_timer;
+                add_timer(&lp->timer);
+        }
+        return 0;
+}
+
+static int
+r6040_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+        struct r6040_private *lp = netdev_priv(dev);
+        struct r6040_descriptor *descptr;
+        void __iomem *ioaddr = lp->base;
+        unsigned long flags;
+        int ret;
+
+        if (!skb)       /* NULL skb directly return */
+                return ret;
+
+        if (skb->len >= MAX_BUF_SIZE) { /* Packet too long, drop it */
+                dev_kfree_skb(skb);
+                return ret;
+        }
+
+        /* Critical Section */
+        spin_lock_irqsave(&lp->lock, flags);
+
+        /* TX resource check */
+        if (!lp->tx_free_desc) {
+                spin_unlock_irqrestore(&lp->lock, flags);
+                printk(KERN_ERR DRV_NAME ": no tx descriptor\n");
+                ret = 1;
+                return ret;
+        }
+
+        /* Statistic Counter */
+        dev->stats.tx_packets++;
+        dev->stats.tx_bytes += skb->len;
+        /* Set TX descriptor & Transmit it */
+        lp->tx_free_desc--;
+        descptr = lp->tx_insert_ptr;
+        if (skb->len < MISR)
+                descptr->len = MISR;
+        else
+                descptr->len = skb->len;
+
+        descptr->skb_ptr = skb;
+        descptr->buf = cpu_to_le32(pci_map_single(lp->pdev,
+                skb->data, skb->len, PCI_DMA_TODEVICE));
+        descptr->status = 0x8000;
+        /* Trigger the MAC to check the TX descriptor */
+        iowrite16(0x01, ioaddr + MTPR);
+        lp->tx_insert_ptr = descptr->vndescp;
+
+        /* If no tx resource, stop */
+        if (!lp->tx_free_desc)
+                netif_stop_queue(dev);
+
+        dev->trans_start = jiffies;
+        spin_unlock_irqrestore(&lp->lock, flags);
+        return ret;
+}
+
+static void
+r6040_multicast_list(struct net_device *dev)
+{
+        struct r6040_private *lp = netdev_priv(dev);
+        void __iomem *ioaddr = lp->base;
+        u16 *adrp;
+        u16 reg;
+        unsigned long flags;
+        struct dev_mc_list *dmi = dev->mc_list;
+        int i;
+
+        /* MAC Address */
+        adrp = (u16 *)dev->dev_addr;
+        iowrite16(adrp[0], ioaddr + MID_0L);
+        iowrite16(adrp[1], ioaddr + MID_0M);
+        iowrite16(adrp[2], ioaddr + MID_0H);
+
+        /* Promiscous Mode */
+        spin_lock_irqsave(&lp->lock, flags);
+
+        /* Clear AMCP & PROM bits */
+        reg = ioread16(ioaddr) & ~0x0120;
+        if (dev->flags & IFF_PROMISC) {
+                reg |= 0x0020;
+                lp->mcr0 |= 0x0020;
+        }
+        /* Too many multicast addresses
+         * accept all traffic */
+        else if ((dev->mc_count > MCAST_MAX)
+                || (dev->flags & IFF_ALLMULTI))
+                reg |= 0x0020;
+
+        iowrite16(reg, ioaddr);
+        spin_unlock_irqrestore(&lp->lock, flags);
+
+        /* Build the hash table */
+        if (dev->mc_count > MCAST_MAX) {
+                u16 hash_table[4];
+                u32 crc;
+
+                for (i = 0; i < 4; i++)
+                        hash_table[i] = 0;
+
+                for (i = 0; i < dev->mc_count; i++) {
+                        char *addrs = dmi->dmi_addr;
+
+                        dmi = dmi->next;
+
+                        if (!(*addrs & 1))
+                                continue;
+
+                        crc = ether_crc_le(6, addrs);
+                        crc >>= 26;
+                        hash_table[crc >> 4] |= 1 << (15 - (crc & 0xf));
+                }
+                /* Write the index of the hash table */
+                for (i = 0; i < 4; i++)
+                        iowrite16(hash_table[i] << 14, ioaddr + MCR1);
+                /* Fill the MAC hash tables with their values */
+                iowrite16(hash_table[0], ioaddr + MAR0);
+                iowrite16(hash_table[1], ioaddr + MAR1);
+                iowrite16(hash_table[2], ioaddr + MAR2);
+                iowrite16(hash_table[3], ioaddr + MAR3);
+        }
+        /* Multicast Address 1~4 case */
+        for (i = 0, dmi; (i < dev->mc_count) && (i < MCAST_MAX); i++) {
+                adrp = (u16 *)dmi->dmi_addr;
+                iowrite16(adrp[0], ioaddr + MID_1L + 8*i);
+                iowrite16(adrp[1], ioaddr + MID_1M + 8*i);
+                iowrite16(adrp[2], ioaddr + MID_1H + 8*i);
+                dmi = dmi->next;
+        }
+        for (i = dev->mc_count; i < MCAST_MAX; i++) {
+                iowrite16(0xffff, ioaddr + MID_0L + 8*i);
+                iowrite16(0xffff, ioaddr + MID_0M + 8*i);
+                iowrite16(0xffff, ioaddr + MID_0H + 8*i);
+        }
+}
+
+static void netdev_get_drvinfo(struct net_device *dev,
+                        struct ethtool_drvinfo *info)
+{
+        struct r6040_private *rp = netdev_priv(dev);
+
+        strcpy(info->driver, DRV_NAME);
+        strcpy(info->version, DRV_VERSION);
+        strcpy(info->bus_info, pci_name(rp->pdev));
+}
+
+static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+        struct r6040_private *rp = netdev_priv(dev);
+        int rc;
+
+        spin_lock_irq(&rp->lock);
+        rc = mii_ethtool_gset(&rp->mii_if, cmd);
+        spin_unlock_irq(&rp->mii_if);
+
+        return rc;
+}
+
+static int netdev_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+        struct r6040_private *rp = netdev_priv(dev);
+        int rc;
+
+        spin_lock_irq(&rp->lock);
+        rc = mii_ethtool_sset(&rp->mii_if, cmd);
+        spin_unlock_irq(&rp->lock);
+        r6040_set_carrier(&rp->mii_if);
+
+        return rc;
+}
+
+static u32 netdev_get_link(struct net_device *dev)
+{
+        struct r6040_private *rp = netdev_priv(dev);
+
+        return mii_link_ok(&rp->mii_if);
+}
+
+static struct ethtool_ops netdev_ethtool_ops = {
+        .get_drvinfo            = netdev_get_drvinfo,
+        .get_settings           = netdev_get_settings,
+        .set_settings           = netdev_set_settings,
+        .get_link               = netdev_get_link,
+};
+
+
+static int __devinit r6040_init_one(struct pci_dev *pdev,
+                                         const struct pci_device_id *ent)
+{
+        struct net_device *dev;
+        struct r6040_private *lp;
+        void __iomem *ioaddr;
+        int err, io_size = R6040_IO_SIZE;
+        static int card_idx = -1;
+        int bar = 0;
+        long pioaddr;
+        u16 *adrp;
+
+        printk(KERN_INFO "%s\n", version);
+
+        err = pci_enable_device(pdev);
+        if (err)
+                return err;
+
+        /* this should always be supported */
+        if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
+                printk(KERN_ERR DRV_NAME "32-bit PCI DMA addresses"
+                                "not supported by the card\n");
+                return -ENODEV;
+        }
+
+        /* IO Size check */
+        if (pci_resource_len(pdev, 0) < io_size) {
+                printk(KERN_ERR "Insufficient PCI resources, aborting\n");
+                return -EIO;
+        }
+
+        pioaddr = pci_resource_start(pdev, 0);  /* IO map base address */
+        pci_set_master(pdev);
+
+        dev = alloc_etherdev(sizeof(struct r6040_private));
+        if (!dev) {
+                printk(KERN_ERR "Failed to allocate etherdev\n");
+                return -ENOMEM;
+        }
+        SET_NETDEV_DEV(dev, &pdev->dev);
+        lp = netdev_priv(dev);
+        lp->pdev = pdev;
+
+        if (pci_request_regions(pdev, DRV_NAME)) {
+                printk(KERN_ERR DRV_NAME ": Failed to request PCI regions\n");
+                err = -ENODEV;
+                goto err_out_disable;
+        }
+
+        ioaddr = pci_iomap(pdev, bar, io_size);
+        if (!ioaddr) {
+                printk(KERN_ERR "ioremap failed for device %s\n",
+                        pci_name(pdev));
+                return -EIO;
+        }
+
+        /* Init system & device */
+        dev->base_addr = (unsigned long)ioaddr;
+        lp->base = ioaddr;
+        dev->irq = pdev->irq;
+
+        spin_lock_init(&lp->lock);
+        pci_set_drvdata(pdev, dev);
+
+        /* Set MAC address */
+        card_idx++;
+
+        adrp = (u16 *)dev->dev_addr;
+        adrp[0] = ioread16(ioaddr + MID_0L);
+        adrp[1] = ioread16(ioaddr + MID_0M);
+        adrp[2] = ioread16(ioaddr + MID_0H);
+
+        /* Link new device into r6040_root_dev */
+        lp->pdev = pdev;
+
+        /* Init RDC private data */
+        lp->mcr0 = 0x1002;
+        lp->phy_addr = phy_table[card_idx];
+        lp->switch_sig = 0;
+
+        /* The RDC-specific entries in the device structure. */
+        dev->open = &r6040_open;
+        dev->hard_start_xmit = &r6040_start_xmit;
+        dev->stop = &r6040_close;
+        dev->get_stats = r6040_get_stats;
+        dev->set_multicast_list = &r6040_multicast_list;
+        dev->do_ioctl = &r6040_ioctl;
+        dev->ethtool_ops = &netdev_ethtool_ops;
+        dev->tx_timeout = &r6040_tx_timeout;
+        dev->watchdog_timeo = TX_TIMEOUT;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+        dev->poll_controller = r6040_poll_controller;
+#endif
+        netif_napi_add(dev, &lp->napi, r6040_poll, 64);
+        lp->mii_if.dev = dev;
+        lp->mii_if.mdio_read = mdio_read;
+        lp->mii_if.mdio_write = mdio_write;
+        lp->mii_if.phy_id = lp->phy_addr;
+        lp->mii_if.phy_id_mask = 0x1f;
+        lp->mii_if.reg_num_mask = 0x1f;
+
+        /* Register net device. After this dev->name assign */
+        err = register_netdev(dev);
+        if (err) {
+                printk(KERN_ERR DRV_NAME ": Failed to register net device\n");
+                goto err_out_res;
+        }
+        return 0;
+
+err_out_res:
+        pci_release_regions(pdev);
+err_out_disable:
+        pci_disable_device(pdev);
+        pci_set_drvdata(pdev, NULL);
+        free_netdev(dev);
+
+        return err;
+}
+
+static void __devexit r6040_remove_one(struct pci_dev *pdev)
+{
+        struct net_device *dev = pci_get_drvdata(pdev);
+
+        unregister_netdev(dev);
+        pci_release_regions(pdev);
+        free_netdev(dev);
+        pci_disable_device(pdev);
+        pci_set_drvdata(pdev, NULL);
+}
+
+
+static struct pci_device_id r6040_pci_tbl[] = {
+        { PCI_DEVICE(PCI_VENDOR_ID_RDC, PCI_DEVICE_ID_RDC_R6040) },
+        {0 }
+};
+MODULE_DEVICE_TABLE(pci, r6040_pci_tbl);
+
+static struct pci_driver r6040_driver = {
+        .name           = "r6040",
+        .id_table       = r6040_pci_tbl,
+        .probe          = r6040_init_one,
+        .remove         = __devexit_p(r6040_remove_one),
+};
+
+
+static int __init r6040_init(void)
+{
+        return pci_register_driver(&r6040_driver);
+}
+
+
+static void __exit r6040_cleanup(void)
+{
+        pci_unregister_driver(&r6040_driver);
+}
+
+module_init(r6040_init);
+module_exit(r6040_cleanup);