ewrk3/tulip: Move the DEC - Tulip drivers

Move the DEC - Tulip driver into drivers/net/ethernet/dec/tulip/
and make the necessary Kconfig and Makefile changes.

The Digital Equioment (DEC) driver ewrk3 was moved into
drivers/net/ethernet/dec/ and the remaining drivers (Tulip)
were moved into drivers/net/ethernet/dec/tulip/

CC: Tobias Ringstrom <tori@unhappy.mine.nu>
CC: Grant Grundler <grundler@parisc-linux.org>
CC: David Davies <davies@maniac.ultranet.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Grant Grundler <grundler@parisc-linux.org>

1 files changed, 1154 insertions, 0 deletions

diff --git a/drivers/net/ethernet/dec/tulip/xircom_cb.c b/drivers/net/ethernet/dec/tulip/xircom_cb.c
new file mode 100644
index 000000000000..988b8eb24d37
--- /dev/null
+++ b/drivers/net/ethernet/dec/tulip/xircom_cb.c
@@ -0,0 +1,1154 @@
+/*
+ * xircom_cb: A driver for the (tulip-like) Xircom Cardbus ethernet cards
+ *
+ * This software is (C) by the respective authors, and licensed under the GPL
+ * License.
+ *
+ * Written by Arjan van de Ven for Red Hat, Inc.
+ * Based on work by Jeff Garzik, Doug Ledford and Donald Becker
+ *
+ *      This software may be used and distributed according to the terms
+ *      of the GNU General Public License, incorporated herein by reference.
+ *
+ *
+ *      $Id: xircom_cb.c,v 1.33 2001/03/19 14:02:07 arjanv Exp $
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.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/delay.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#ifdef CONFIG_NET_POLL_CONTROLLER
+#include <asm/irq.h>
+#endif
+
+MODULE_DESCRIPTION("Xircom Cardbus ethernet driver");
+MODULE_AUTHOR("Arjan van de Ven <arjanv@redhat.com>");
+MODULE_LICENSE("GPL");
+
+
+
+/* IO registers on the card, offsets */
+#define CSR0    0x00
+#define CSR1    0x08
+#define CSR2    0x10
+#define CSR3    0x18
+#define CSR4    0x20
+#define CSR5    0x28
+#define CSR6    0x30
+#define CSR7    0x38
+#define CSR8    0x40
+#define CSR9    0x48
+#define CSR10   0x50
+#define CSR11   0x58
+#define CSR12   0x60
+#define CSR13   0x68
+#define CSR14   0x70
+#define CSR15   0x78
+#define CSR16   0x80
+
+/* PCI registers */
+#define PCI_POWERMGMT   0x40
+
+/* Offsets of the buffers within the descriptor pages, in bytes */
+
+#define NUMDESCRIPTORS 4
+
+static int bufferoffsets[NUMDESCRIPTORS] = {128,2048,4096,6144};
+
+
+struct xircom_private {
+        /* Send and receive buffers, kernel-addressable and dma addressable forms */
+
+        __le32 *rx_buffer;
+        __le32 *tx_buffer;
+
+        dma_addr_t rx_dma_handle;
+        dma_addr_t tx_dma_handle;
+
+        struct sk_buff *tx_skb[4];
+
+        unsigned long io_port;
+        int open;
+
+        /* transmit_used is the rotating counter that indicates which transmit
+           descriptor has to be used next */
+        int transmit_used;
+
+        /* Spinlock to serialize register operations.
+           It must be helt while manipulating the following registers:
+           CSR0, CSR6, CSR7, CSR9, CSR10, CSR15
+         */
+        spinlock_t lock;
+
+        struct pci_dev *pdev;
+        struct net_device *dev;
+};
+
+
+/* Function prototypes */
+static int xircom_probe(struct pci_dev *pdev, const struct pci_device_id *id);
+static void xircom_remove(struct pci_dev *pdev);
+static irqreturn_t xircom_interrupt(int irq, void *dev_instance);
+static netdev_tx_t xircom_start_xmit(struct sk_buff *skb,
+                                           struct net_device *dev);
+static int xircom_open(struct net_device *dev);
+static int xircom_close(struct net_device *dev);
+static void xircom_up(struct xircom_private *card);
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void xircom_poll_controller(struct net_device *dev);
+#endif
+
+static void investigate_read_descriptor(struct net_device *dev,struct xircom_private *card, int descnr, unsigned int bufferoffset);
+static void investigate_write_descriptor(struct net_device *dev, struct xircom_private *card, int descnr, unsigned int bufferoffset);
+static void read_mac_address(struct xircom_private *card);
+static void transceiver_voodoo(struct xircom_private *card);
+static void initialize_card(struct xircom_private *card);
+static void trigger_transmit(struct xircom_private *card);
+static void trigger_receive(struct xircom_private *card);
+static void setup_descriptors(struct xircom_private *card);
+static void remove_descriptors(struct xircom_private *card);
+static int link_status_changed(struct xircom_private *card);
+static void activate_receiver(struct xircom_private *card);
+static void deactivate_receiver(struct xircom_private *card);
+static void activate_transmitter(struct xircom_private *card);
+static void deactivate_transmitter(struct xircom_private *card);
+static void enable_transmit_interrupt(struct xircom_private *card);
+static void enable_receive_interrupt(struct xircom_private *card);
+static void enable_link_interrupt(struct xircom_private *card);
+static void disable_all_interrupts(struct xircom_private *card);
+static int link_status(struct xircom_private *card);
+
+
+
+static DEFINE_PCI_DEVICE_TABLE(xircom_pci_table) = {
+        {0x115D, 0x0003, PCI_ANY_ID, PCI_ANY_ID,},
+        {0,},
+};
+MODULE_DEVICE_TABLE(pci, xircom_pci_table);
+
+static struct pci_driver xircom_ops = {
+        .name           = "xircom_cb",
+        .id_table       = xircom_pci_table,
+        .probe          = xircom_probe,
+        .remove         = xircom_remove,
+        .suspend =NULL,
+        .resume =NULL
+};
+
+
+#if defined DEBUG && DEBUG > 1
+static void print_binary(unsigned int number)
+{
+        int i,i2;
+        char buffer[64];
+        memset(buffer,0,64);
+        i2=0;
+        for (i=31;i>=0;i--) {
+                if (number & (1<<i))
+                        buffer[i2++]='1';
+                else
+                        buffer[i2++]='0';
+                if ((i&3)==0)
+                        buffer[i2++]=' ';
+        }
+        pr_debug("%s\n",buffer);
+}
+#endif
+
+static const struct net_device_ops netdev_ops = {
+        .ndo_open               = xircom_open,
+        .ndo_stop               = xircom_close,
+        .ndo_start_xmit         = xircom_start_xmit,
+        .ndo_change_mtu         = eth_change_mtu,
+        .ndo_set_mac_address    = eth_mac_addr,
+        .ndo_validate_addr      = eth_validate_addr,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+        .ndo_poll_controller    = xircom_poll_controller,
+#endif
+};
+
+/* xircom_probe is the code that gets called on device insertion.
+   it sets up the hardware and registers the device to the networklayer.
+
+   TODO: Send 1 or 2 "dummy" packets here as the card seems to discard the
+         first two packets that get send, and pump hates that.
+
+ */
+static int __devinit xircom_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+        struct net_device *dev = NULL;
+        struct xircom_private *private;
+        unsigned long flags;
+        unsigned short tmp16;
+
+        /* First do the PCI initialisation */
+
+        if (pci_enable_device(pdev))
+                return -ENODEV;
+
+        /* disable all powermanagement */
+        pci_write_config_dword(pdev, PCI_POWERMGMT, 0x0000);
+
+        pci_set_master(pdev); /* Why isn't this done by pci_enable_device ?*/
+
+        /* clear PCI status, if any */
+        pci_read_config_word (pdev,PCI_STATUS, &tmp16);
+        pci_write_config_word (pdev, PCI_STATUS,tmp16);
+
+        if (!request_region(pci_resource_start(pdev, 0), 128, "xircom_cb")) {
+                pr_err("%s: failed to allocate io-region\n", __func__);
+                return -ENODEV;
+        }
+
+        /*
+           Before changing the hardware, allocate the memory.
+           This way, we can fail gracefully if not enough memory
+           is available.
+         */
+        dev = alloc_etherdev(sizeof(struct xircom_private));
+        if (!dev) {
+                pr_err("%s: failed to allocate etherdev\n", __func__);
+                goto device_fail;
+        }
+        private = netdev_priv(dev);
+
+        /* Allocate the send/receive buffers */
+        private->rx_buffer = pci_alloc_consistent(pdev,8192,&private->rx_dma_handle);
+        if (private->rx_buffer == NULL) {
+                pr_err("%s: no memory for rx buffer\n", __func__);
+                goto rx_buf_fail;
+        }
+        private->tx_buffer = pci_alloc_consistent(pdev,8192,&private->tx_dma_handle);
+        if (private->tx_buffer == NULL) {
+                pr_err("%s: no memory for tx buffer\n", __func__);
+                goto tx_buf_fail;
+        }
+
+        SET_NETDEV_DEV(dev, &pdev->dev);
+
+
+        private->dev = dev;
+        private->pdev = pdev;
+        private->io_port = pci_resource_start(pdev, 0);
+        spin_lock_init(&private->lock);
+        dev->irq = pdev->irq;
+        dev->base_addr = private->io_port;
+
+        initialize_card(private);
+        read_mac_address(private);
+        setup_descriptors(private);
+
+        dev->netdev_ops = &netdev_ops;
+        pci_set_drvdata(pdev, dev);
+
+        if (register_netdev(dev)) {
+                pr_err("%s: netdevice registration failed\n", __func__);
+                goto reg_fail;
+        }
+
+        netdev_info(dev, "Xircom cardbus revision %i at irq %i\n",
+                    pdev->revision, pdev->irq);
+        /* start the transmitter to get a heartbeat */
+        /* TODO: send 2 dummy packets here */
+        transceiver_voodoo(private);
+
+        spin_lock_irqsave(&private->lock,flags);
+        activate_transmitter(private);
+        activate_receiver(private);
+        spin_unlock_irqrestore(&private->lock,flags);
+
+        trigger_receive(private);
+
+        return 0;
+
+reg_fail:
+        kfree(private->tx_buffer);
+tx_buf_fail:
+        kfree(private->rx_buffer);
+rx_buf_fail:
+        free_netdev(dev);
+device_fail:
+        return -ENODEV;
+}
+
+
+/*
+ xircom_remove is called on module-unload or on device-eject.
+ it unregisters the irq, io-region and network device.
+ Interrupts and such are already stopped in the "ifconfig ethX down"
+ code.
+ */
+static void __devexit xircom_remove(struct pci_dev *pdev)
+{
+        struct net_device *dev = pci_get_drvdata(pdev);
+        struct xircom_private *card = netdev_priv(dev);
+
+        pci_free_consistent(pdev,8192,card->rx_buffer,card->rx_dma_handle);
+        pci_free_consistent(pdev,8192,card->tx_buffer,card->tx_dma_handle);
+
+        release_region(dev->base_addr, 128);
+        unregister_netdev(dev);
+        free_netdev(dev);
+        pci_set_drvdata(pdev, NULL);
+}
+
+static irqreturn_t xircom_interrupt(int irq, void *dev_instance)
+{
+        struct net_device *dev = (struct net_device *) dev_instance;
+        struct xircom_private *card = netdev_priv(dev);
+        unsigned int status;
+        int i;
+
+        spin_lock(&card->lock);
+        status = inl(card->io_port+CSR5);
+
+#if defined DEBUG && DEBUG > 1
+        print_binary(status);
+        pr_debug("tx status 0x%08x 0x%08x\n",
+                 card->tx_buffer[0], card->tx_buffer[4]);
+        pr_debug("rx status 0x%08x 0x%08x\n",
+                 card->rx_buffer[0], card->rx_buffer[4]);
+#endif
+        /* Handle shared irq and hotplug */
+        if (status == 0 || status == 0xffffffff) {
+                spin_unlock(&card->lock);
+                return IRQ_NONE;
+        }
+
+        if (link_status_changed(card)) {
+                int newlink;
+                netdev_dbg(dev, "Link status has changed\n");
+                newlink = link_status(card);
+                netdev_info(dev, "Link is %d mbit\n", newlink);
+                if (newlink)
+                        netif_carrier_on(dev);
+                else
+                        netif_carrier_off(dev);
+
+        }
+
+        /* Clear all remaining interrupts */
+        status |= 0xffffffff; /* FIXME: make this clear only the
+                                        real existing bits */
+        outl(status,card->io_port+CSR5);
+
+
+        for (i=0;i<NUMDESCRIPTORS;i++)
+                investigate_write_descriptor(dev,card,i,bufferoffsets[i]);
+        for (i=0;i<NUMDESCRIPTORS;i++)
+                investigate_read_descriptor(dev,card,i,bufferoffsets[i]);
+
+        spin_unlock(&card->lock);
+        return IRQ_HANDLED;
+}
+
+static netdev_tx_t xircom_start_xmit(struct sk_buff *skb,
+                                           struct net_device *dev)
+{
+        struct xircom_private *card;
+        unsigned long flags;
+        int nextdescriptor;
+        int desc;
+
+        card = netdev_priv(dev);
+        spin_lock_irqsave(&card->lock,flags);
+
+        /* First see if we can free some descriptors */
+        for (desc=0;desc<NUMDESCRIPTORS;desc++)
+                investigate_write_descriptor(dev,card,desc,bufferoffsets[desc]);
+
+
+        nextdescriptor = (card->transmit_used +1) % (NUMDESCRIPTORS);
+        desc = card->transmit_used;
+
+        /* only send the packet if the descriptor is free */
+        if (card->tx_buffer[4*desc]==0) {
+                        /* Copy the packet data; zero the memory first as the card
+                           sometimes sends more than you ask it to. */
+
+                        memset(&card->tx_buffer[bufferoffsets[desc]/4],0,1536);
+                        skb_copy_from_linear_data(skb,
+                                  &(card->tx_buffer[bufferoffsets[desc] / 4]),
+                                                  skb->len);
+                        /* FIXME: The specification tells us that the length we send HAS to be a multiple of
+                           4 bytes. */
+
+                        card->tx_buffer[4*desc+1] = cpu_to_le32(skb->len);
+                        if (desc == NUMDESCRIPTORS - 1) /* bit 25: last descriptor of the ring */
+                                card->tx_buffer[4*desc+1] |= cpu_to_le32(1<<25);  
+
+                        card->tx_buffer[4*desc+1] |= cpu_to_le32(0xF0000000);
+                                                 /* 0xF0... means want interrupts*/
+                        card->tx_skb[desc] = skb;
+
+                        wmb();
+                        /* This gives the descriptor to the card */
+                        card->tx_buffer[4*desc] = cpu_to_le32(0x80000000);
+                        trigger_transmit(card);
+                        if (card->tx_buffer[nextdescriptor*4] & cpu_to_le32(0x8000000)) {
+                                /* next descriptor is occupied... */
+                                netif_stop_queue(dev);
+                        }
+                        card->transmit_used = nextdescriptor;
+                        spin_unlock_irqrestore(&card->lock,flags);
+                        return NETDEV_TX_OK;
+        }
+
+        /* Uh oh... no free descriptor... drop the packet */
+        netif_stop_queue(dev);
+        spin_unlock_irqrestore(&card->lock,flags);
+        trigger_transmit(card);
+
+        return NETDEV_TX_BUSY;
+}
+
+
+
+
+static int xircom_open(struct net_device *dev)
+{
+        struct xircom_private *xp = netdev_priv(dev);
+        int retval;
+
+        netdev_info(dev, "xircom cardbus adaptor found, using irq %i\n",
+                    dev->irq);
+        retval = request_irq(dev->irq, xircom_interrupt, IRQF_SHARED, dev->name, dev);
+        if (retval)
+                return retval;
+
+        xircom_up(xp);
+        xp->open = 1;
+
+        return 0;
+}
+
+static int xircom_close(struct net_device *dev)
+{
+        struct xircom_private *card;
+        unsigned long flags;
+
+        card = netdev_priv(dev);
+        netif_stop_queue(dev); /* we don't want new packets */
+
+
+        spin_lock_irqsave(&card->lock,flags);
+
+        disable_all_interrupts(card);
+#if 0
+        /* We can enable this again once we send dummy packets on ifconfig ethX up */
+        deactivate_receiver(card);
+        deactivate_transmitter(card);
+#endif
+        remove_descriptors(card);
+
+        spin_unlock_irqrestore(&card->lock,flags);
+
+        card->open = 0;
+        free_irq(dev->irq,dev);
+
+        return 0;
+
+}
+
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void xircom_poll_controller(struct net_device *dev)
+{
+        disable_irq(dev->irq);
+        xircom_interrupt(dev->irq, dev);
+        enable_irq(dev->irq);
+}
+#endif
+
+
+static void initialize_card(struct xircom_private *card)
+{
+        unsigned int val;
+        unsigned long flags;
+
+        spin_lock_irqsave(&card->lock, flags);
+
+        /* First: reset the card */
+        val = inl(card->io_port + CSR0);
+        val |= 0x01;            /* Software reset */
+        outl(val, card->io_port + CSR0);
+
+        udelay(100);            /* give the card some time to reset */
+
+        val = inl(card->io_port + CSR0);
+        val &= ~0x01;           /* disable Software reset */
+        outl(val, card->io_port + CSR0);
+
+
+        val = 0;                /* Value 0x00 is a safe and conservative value
+                                   for the PCI configuration settings */
+        outl(val, card->io_port + CSR0);
+
+
+        disable_all_interrupts(card);
+        deactivate_receiver(card);
+        deactivate_transmitter(card);
+
+        spin_unlock_irqrestore(&card->lock, flags);
+}
+
+/*
+trigger_transmit causes the card to check for frames to be transmitted.
+This is accomplished by writing to the CSR1 port. The documentation
+claims that the act of writing is sufficient and that the value is
+ignored; I chose zero.
+*/
+static void trigger_transmit(struct xircom_private *card)
+{
+        unsigned int val;
+
+        val = 0;
+        outl(val, card->io_port + CSR1);
+}
+
+/*
+trigger_receive causes the card to check for empty frames in the
+descriptor list in which packets can be received.
+This is accomplished by writing to the CSR2 port. The documentation
+claims that the act of writing is sufficient and that the value is
+ignored; I chose zero.
+*/
+static void trigger_receive(struct xircom_private *card)
+{
+        unsigned int val;
+
+        val = 0;
+        outl(val, card->io_port + CSR2);
+}
+
+/*
+setup_descriptors initializes the send and receive buffers to be valid
+descriptors and programs the addresses into the card.
+*/
+static void setup_descriptors(struct xircom_private *card)
+{
+        u32 address;
+        int i;
+
+        BUG_ON(card->rx_buffer == NULL);
+        BUG_ON(card->tx_buffer == NULL);
+
+        /* Receive descriptors */
+        memset(card->rx_buffer, 0, 128);        /* clear the descriptors */
+        for (i=0;i<NUMDESCRIPTORS;i++ ) {
+
+                /* Rx Descr0: It's empty, let the card own it, no errors -> 0x80000000 */
+                card->rx_buffer[i*4 + 0] = cpu_to_le32(0x80000000);
+                /* Rx Descr1: buffer 1 is 1536 bytes, buffer 2 is 0 bytes */
+                card->rx_buffer[i*4 + 1] = cpu_to_le32(1536);
+                if (i == NUMDESCRIPTORS - 1) /* bit 25 is "last descriptor" */
+                        card->rx_buffer[i*4 + 1] |= cpu_to_le32(1 << 25);
+
+                /* Rx Descr2: address of the buffer
+                   we store the buffer at the 2nd half of the page */
+
+                address = card->rx_dma_handle;
+                card->rx_buffer[i*4 + 2] = cpu_to_le32(address + bufferoffsets[i]);
+                /* Rx Desc3: address of 2nd buffer -> 0 */
+                card->rx_buffer[i*4 + 3] = 0;
+        }
+
+        wmb();
+        /* Write the receive descriptor ring address to the card */
+        address = card->rx_dma_handle;
+        outl(address, card->io_port + CSR3);    /* Receive descr list address */
+
+
+        /* transmit descriptors */
+        memset(card->tx_buffer, 0, 128);        /* clear the descriptors */
+
+        for (i=0;i<NUMDESCRIPTORS;i++ ) {
+                /* Tx Descr0: Empty, we own it, no errors -> 0x00000000 */
+                card->tx_buffer[i*4 + 0] = 0x00000000;
+                /* Tx Descr1: buffer 1 is 1536 bytes, buffer 2 is 0 bytes */
+                card->tx_buffer[i*4 + 1] = cpu_to_le32(1536);
+                if (i == NUMDESCRIPTORS - 1) /* bit 25 is "last descriptor" */
+                        card->tx_buffer[i*4 + 1] |= cpu_to_le32(1 << 25);
+
+                /* Tx Descr2: address of the buffer
+                   we store the buffer at the 2nd half of the page */
+                address = card->tx_dma_handle;
+                card->tx_buffer[i*4 + 2] = cpu_to_le32(address + bufferoffsets[i]);
+                /* Tx Desc3: address of 2nd buffer -> 0 */
+                card->tx_buffer[i*4 + 3] = 0;
+        }
+
+        wmb();
+        /* wite the transmit descriptor ring to the card */
+        address = card->tx_dma_handle;
+        outl(address, card->io_port + CSR4);    /* xmit descr list address */
+}
+
+/*
+remove_descriptors informs the card the descriptors are no longer
+valid by setting the address in the card to 0x00.
+*/
+static void remove_descriptors(struct xircom_private *card)
+{
+        unsigned int val;
+
+        val = 0;
+        outl(val, card->io_port + CSR3);        /* Receive descriptor address */
+        outl(val, card->io_port + CSR4);        /* Send descriptor address */
+}
+
+/*
+link_status_changed returns 1 if the card has indicated that
+the link status has changed. The new link status has to be read from CSR12.
+
+This function also clears the status-bit.
+*/
+static int link_status_changed(struct xircom_private *card)
+{
+        unsigned int val;
+
+        val = inl(card->io_port + CSR5);        /* Status register */
+
+        if ((val & (1 << 27)) == 0)             /* no change */
+                return 0;
+
+        /* clear the event by writing a 1 to the bit in the
+           status register. */
+        val = (1 << 27);
+        outl(val, card->io_port + CSR5);
+
+        return 1;
+}
+
+
+/*
+transmit_active returns 1 if the transmitter on the card is
+in a non-stopped state.
+*/
+static int transmit_active(struct xircom_private *card)
+{
+        unsigned int val;
+
+        val = inl(card->io_port + CSR5);        /* Status register */
+
+        if ((val & (7 << 20)) == 0)             /* transmitter disabled */
+                return 0;
+
+        return 1;
+}
+
+/*
+receive_active returns 1 if the receiver on the card is
+in a non-stopped state.
+*/
+static int receive_active(struct xircom_private *card)
+{
+        unsigned int val;
+
+        val = inl(card->io_port + CSR5);        /* Status register */
+
+        if ((val & (7 << 17)) == 0)             /* receiver disabled */
+                return 0;
+
+        return 1;
+}
+
+/*
+activate_receiver enables the receiver on the card.
+Before being allowed to active the receiver, the receiver
+must be completely de-activated. To achieve this,
+this code actually disables the receiver first; then it waits for the
+receiver to become inactive, then it activates the receiver and then
+it waits for the receiver to be active.
+
+must be called with the lock held and interrupts disabled.
+*/
+static void activate_receiver(struct xircom_private *card)
+{
+        unsigned int val;
+        int counter;
+
+        val = inl(card->io_port + CSR6);        /* Operation mode */
+
+        /* If the "active" bit is set and the receiver is already
+           active, no need to do the expensive thing */
+        if ((val&2) && (receive_active(card)))
+                return;
+
+
+        val = val & ~2;         /* disable the receiver */
+        outl(val, card->io_port + CSR6);
+
+        counter = 10;
+        while (counter > 0) {
+                if (!receive_active(card))
+                        break;
+                /* wait a while */
+                udelay(50);
+                counter--;
+                if (counter <= 0)
+                        netdev_err(card->dev, "Receiver failed to deactivate\n");
+        }
+
+        /* enable the receiver */
+        val = inl(card->io_port + CSR6);        /* Operation mode */
+        val = val | 2;                          /* enable the receiver */
+        outl(val, card->io_port + CSR6);
+
+        /* now wait for the card to activate again */
+        counter = 10;
+        while (counter > 0) {
+                if (receive_active(card))
+                        break;
+                /* wait a while */
+                udelay(50);
+                counter--;
+                if (counter <= 0)
+                        netdev_err(card->dev,
+                                   "Receiver failed to re-activate\n");
+        }
+}
+
+/*
+deactivate_receiver disables the receiver on the card.
+To achieve this this code disables the receiver first;
+then it waits for the receiver to become inactive.
+
+must be called with the lock held and interrupts disabled.
+*/
+static void deactivate_receiver(struct xircom_private *card)
+{
+        unsigned int val;
+        int counter;
+
+        val = inl(card->io_port + CSR6);        /* Operation mode */
+        val = val & ~2;                         /* disable the receiver */
+        outl(val, card->io_port + CSR6);
+
+        counter = 10;
+        while (counter > 0) {
+                if (!receive_active(card))
+                        break;
+                /* wait a while */
+                udelay(50);
+                counter--;
+                if (counter <= 0)
+                        netdev_err(card->dev, "Receiver failed to deactivate\n");
+        }
+}
+
+
+/*
+activate_transmitter enables the transmitter on the card.
+Before being allowed to active the transmitter, the transmitter
+must be completely de-activated. To achieve this,
+this code actually disables the transmitter first; then it waits for the
+transmitter to become inactive, then it activates the transmitter and then
+it waits for the transmitter to be active again.
+
+must be called with the lock held and interrupts disabled.
+*/
+static void activate_transmitter(struct xircom_private *card)
+{
+        unsigned int val;
+        int counter;
+
+        val = inl(card->io_port + CSR6);        /* Operation mode */
+
+        /* If the "active" bit is set and the receiver is already
+           active, no need to do the expensive thing */
+        if ((val&(1<<13)) && (transmit_active(card)))
+                return;
+
+        val = val & ~(1 << 13); /* disable the transmitter */
+        outl(val, card->io_port + CSR6);
+
+        counter = 10;
+        while (counter > 0) {
+                if (!transmit_active(card))
+                        break;
+                /* wait a while */
+                udelay(50);
+                counter--;
+                if (counter <= 0)
+                        netdev_err(card->dev,
+                                   "Transmitter failed to deactivate\n");
+        }
+
+        /* enable the transmitter */
+        val = inl(card->io_port + CSR6);        /* Operation mode */
+        val = val | (1 << 13);  /* enable the transmitter */
+        outl(val, card->io_port + CSR6);
+
+        /* now wait for the card to activate again */
+        counter = 10;
+        while (counter > 0) {
+                if (transmit_active(card))
+                        break;
+                /* wait a while */
+                udelay(50);
+                counter--;
+                if (counter <= 0)
+                        netdev_err(card->dev,
+                                   "Transmitter failed to re-activate\n");
+        }
+}
+
+/*
+deactivate_transmitter disables the transmitter on the card.
+To achieve this this code disables the transmitter first;
+then it waits for the transmitter to become inactive.
+
+must be called with the lock held and interrupts disabled.
+*/
+static void deactivate_transmitter(struct xircom_private *card)
+{
+        unsigned int val;
+        int counter;
+
+        val = inl(card->io_port + CSR6);        /* Operation mode */
+        val = val & ~2;         /* disable the transmitter */
+        outl(val, card->io_port + CSR6);
+
+        counter = 20;
+        while (counter > 0) {
+                if (!transmit_active(card))
+                        break;
+                /* wait a while */
+                udelay(50);
+                counter--;
+                if (counter <= 0)
+                        netdev_err(card->dev,
+                                   "Transmitter failed to deactivate\n");
+        }
+}
+
+
+/*
+enable_transmit_interrupt enables the transmit interrupt
+
+must be called with the lock held and interrupts disabled.
+*/
+static void enable_transmit_interrupt(struct xircom_private *card)
+{
+        unsigned int val;
+
+        val = inl(card->io_port + CSR7);        /* Interrupt enable register */
+        val |= 1;                               /* enable the transmit interrupt */
+        outl(val, card->io_port + CSR7);
+}
+
+
+/*
+enable_receive_interrupt enables the receive interrupt
+
+must be called with the lock held and interrupts disabled.
+*/
+static void enable_receive_interrupt(struct xircom_private *card)
+{
+        unsigned int val;
+
+        val = inl(card->io_port + CSR7);        /* Interrupt enable register */
+        val = val | (1 << 6);                   /* enable the receive interrupt */
+        outl(val, card->io_port + CSR7);
+}
+
+/*
+enable_link_interrupt enables the link status change interrupt
+
+must be called with the lock held and interrupts disabled.
+*/
+static void enable_link_interrupt(struct xircom_private *card)
+{
+        unsigned int val;
+
+        val = inl(card->io_port + CSR7);        /* Interrupt enable register */
+        val = val | (1 << 27);                  /* enable the link status chage interrupt */
+        outl(val, card->io_port + CSR7);
+}
+
+
+
+/*
+disable_all_interrupts disables all interrupts
+
+must be called with the lock held and interrupts disabled.
+*/
+static void disable_all_interrupts(struct xircom_private *card)
+{
+        unsigned int val;
+
+        val = 0;                                /* disable all interrupts */
+        outl(val, card->io_port + CSR7);
+}
+
+/*
+enable_common_interrupts enables several weird interrupts
+
+must be called with the lock held and interrupts disabled.
+*/
+static void enable_common_interrupts(struct xircom_private *card)
+{
+        unsigned int val;
+
+        val = inl(card->io_port + CSR7);        /* Interrupt enable register */
+        val |= (1<<16); /* Normal Interrupt Summary */
+        val |= (1<<15); /* Abnormal Interrupt Summary */
+        val |= (1<<13); /* Fatal bus error */
+        val |= (1<<8);  /* Receive Process Stopped */
+        val |= (1<<7);  /* Receive Buffer Unavailable */
+        val |= (1<<5);  /* Transmit Underflow */
+        val |= (1<<2);  /* Transmit Buffer Unavailable */
+        val |= (1<<1);  /* Transmit Process Stopped */
+        outl(val, card->io_port + CSR7);
+}
+
+/*
+enable_promisc starts promisc mode
+
+must be called with the lock held and interrupts disabled.
+*/
+static int enable_promisc(struct xircom_private *card)
+{
+        unsigned int val;
+
+        val = inl(card->io_port + CSR6);
+        val = val | (1 << 6);
+        outl(val, card->io_port + CSR6);
+
+        return 1;
+}
+
+
+
+
+/*
+link_status() checks the links status and will return 0 for no link, 10 for 10mbit link and 100 for.. guess what.
+
+Must be called in locked state with interrupts disabled
+*/
+static int link_status(struct xircom_private *card)
+{
+        unsigned int val;
+
+        val = inb(card->io_port + CSR12);
+
+        if (!(val&(1<<2)))  /* bit 2 is 0 for 10mbit link, 1 for not an 10mbit link */
+                return 10;
+        if (!(val&(1<<1)))  /* bit 1 is 0 for 100mbit link, 1 for not an 100mbit link */
+                return 100;
+
+        /* If we get here -> no link at all */
+
+        return 0;
+}
+
+
+
+
+
+/*
+  read_mac_address() reads the MAC address from the NIC and stores it in the "dev" structure.
+
+  This function will take the spinlock itself and can, as a result, not be called with the lock helt.
+ */
+static void read_mac_address(struct xircom_private *card)
+{
+        unsigned char j, tuple, link, data_id, data_count;
+        unsigned long flags;
+        int i;
+
+        spin_lock_irqsave(&card->lock, flags);
+
+        outl(1 << 12, card->io_port + CSR9);    /* enable boot rom access */
+        for (i = 0x100; i < 0x1f7; i += link + 2) {
+                outl(i, card->io_port + CSR10);
+                tuple = inl(card->io_port + CSR9) & 0xff;
+                outl(i + 1, card->io_port + CSR10);
+                link = inl(card->io_port + CSR9) & 0xff;
+                outl(i + 2, card->io_port + CSR10);
+                data_id = inl(card->io_port + CSR9) & 0xff;
+                outl(i + 3, card->io_port + CSR10);
+                data_count = inl(card->io_port + CSR9) & 0xff;
+                if ((tuple == 0x22) && (data_id == 0x04) && (data_count == 0x06)) {
+                        /*
+                         * This is it.  We have the data we want.
+                         */
+                        for (j = 0; j < 6; j++) {
+                                outl(i + j + 4, card->io_port + CSR10);
+                                card->dev->dev_addr[j] = inl(card->io_port + CSR9) & 0xff;
+                        }
+                        break;
+                } else if (link == 0) {
+                        break;
+                }
+        }
+        spin_unlock_irqrestore(&card->lock, flags);
+        pr_debug(" %pM\n", card->dev->dev_addr);
+}
+
+
+/*
+ transceiver_voodoo() enables the external UTP plug thingy.
+ it's called voodoo as I stole this code and cannot cross-reference
+ it with the specification.
+ */
+static void transceiver_voodoo(struct xircom_private *card)
+{
+        unsigned long flags;
+
+        /* disable all powermanagement */
+        pci_write_config_dword(card->pdev, PCI_POWERMGMT, 0x0000);
+
+        setup_descriptors(card);
+
+        spin_lock_irqsave(&card->lock, flags);
+
+        outl(0x0008, card->io_port + CSR15);
+        udelay(25);
+        outl(0xa8050000, card->io_port + CSR15);
+        udelay(25);
+        outl(0xa00f0000, card->io_port + CSR15);
+        udelay(25);
+
+        spin_unlock_irqrestore(&card->lock, flags);
+
+        netif_start_queue(card->dev);
+}
+
+
+static void xircom_up(struct xircom_private *card)
+{
+        unsigned long flags;
+        int i;
+
+        /* disable all powermanagement */
+        pci_write_config_dword(card->pdev, PCI_POWERMGMT, 0x0000);
+
+        setup_descriptors(card);
+
+        spin_lock_irqsave(&card->lock, flags);
+
+
+        enable_link_interrupt(card);
+        enable_transmit_interrupt(card);
+        enable_receive_interrupt(card);
+        enable_common_interrupts(card);
+        enable_promisc(card);
+
+        /* The card can have received packets already, read them away now */
+        for (i=0;i<NUMDESCRIPTORS;i++)
+                investigate_read_descriptor(card->dev,card,i,bufferoffsets[i]);
+
+
+        spin_unlock_irqrestore(&card->lock, flags);
+        trigger_receive(card);
+        trigger_transmit(card);
+        netif_start_queue(card->dev);
+}
+
+/* Bufferoffset is in BYTES */
+static void
+investigate_read_descriptor(struct net_device *dev, struct xircom_private *card,
+                            int descnr, unsigned int bufferoffset)
+{
+        int status;
+
+        status = le32_to_cpu(card->rx_buffer[4*descnr]);
+
+        if (status > 0) {               /* packet received */
+
+                /* TODO: discard error packets */
+
+                short pkt_len = ((status >> 16) & 0x7ff) - 4;
+                                        /* minus 4, we don't want the CRC */
+                struct sk_buff *skb;
+
+                if (pkt_len > 1518) {
+                        netdev_err(dev, "Packet length %i is bogus\n", pkt_len);
+                        pkt_len = 1518;
+                }
+
+                skb = dev_alloc_skb(pkt_len + 2);
+                if (skb == NULL) {
+                        dev->stats.rx_dropped++;
+                        goto out;
+                }
+                skb_reserve(skb, 2);
+                skb_copy_to_linear_data(skb,
+                                        &card->rx_buffer[bufferoffset / 4],
+                                        pkt_len);
+                skb_put(skb, pkt_len);
+                skb->protocol = eth_type_trans(skb, dev);
+                netif_rx(skb);
+                dev->stats.rx_packets++;
+                dev->stats.rx_bytes += pkt_len;
+
+out:
+                /* give the buffer back to the card */
+                card->rx_buffer[4*descnr] = cpu_to_le32(0x80000000);
+                trigger_receive(card);
+        }
+}
+
+
+/* Bufferoffset is in BYTES */
+static void
+investigate_write_descriptor(struct net_device *dev,
+                             struct xircom_private *card,
+                             int descnr, unsigned int bufferoffset)
+{
+        int status;
+
+        status = le32_to_cpu(card->tx_buffer[4*descnr]);
+#if 0
+        if (status & 0x8000) {  /* Major error */
+                pr_err("Major transmit error status %x\n", status);
+                card->tx_buffer[4*descnr] = 0;
+                netif_wake_queue (dev);
+        }
+#endif
+        if (status > 0) {       /* bit 31 is 0 when done */
+                if (card->tx_skb[descnr]!=NULL) {
+                        dev->stats.tx_bytes += card->tx_skb[descnr]->len;
+                        dev_kfree_skb_irq(card->tx_skb[descnr]);
+                }
+                card->tx_skb[descnr] = NULL;
+                /* Bit 8 in the status field is 1 if there was a collision */
+                if (status & (1 << 8))
+                        dev->stats.collisions++;
+                card->tx_buffer[4*descnr] = 0; /* descriptor is free again */
+                netif_wake_queue (dev);
+                dev->stats.tx_packets++;
+        }
+}
+
+static int __init xircom_init(void)
+{
+        return pci_register_driver(&xircom_ops);
+}
+
+static void __exit xircom_exit(void)
+{
+        pci_unregister_driver(&xircom_ops);
+}
+
+module_init(xircom_init)
+module_exit(xircom_exit)
+