Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 939 insertions, 0 deletions

diff --git a/drivers/net/at1700.c b/drivers/net/at1700.c
new file mode 100644
index 00000000000..b8ab2b6355e
--- /dev/null
+++ b/drivers/net/at1700.c
@@ -0,0 +1,939 @@
+/* at1700.c: A network device driver for  the Allied Telesis AT1700.
+
+        Written 1993-98 by Donald Becker.
+
+        Copyright 1993 United States Government as represented by the
+        Director, National Security Agency.
+
+        This software may be used and distributed according to the terms
+        of the GNU General Public License, incorporated herein by reference.
+
+        The author may be reached as becker@scyld.com, or C/O
+        Scyld Computing Corporation
+        410 Severn Ave., Suite 210
+        Annapolis MD 21403
+
+        This is a device driver for the Allied Telesis AT1700, and
+        Fujitsu FMV-181/182/181A/182A/183/184/183A/184A, which are
+        straight-forward Fujitsu MB86965 implementations.
+
+        Modification for Fujitsu FMV-18X cards is done by Yutaka Tamiya
+        (tamy@flab.fujitsu.co.jp). 
+
+  Sources:
+    The Fujitsu MB86965 datasheet.
+
+        After the initial version of this driver was written Gerry Sawkins of
+        ATI provided their EEPROM configuration code header file.
+    Thanks to NIIBE Yutaka <gniibe@mri.co.jp> for bug fixes.
+
+    MCA bus (AT1720) support by Rene Schmit <rene@bss.lu>
+
+  Bugs:
+        The MB86965 has a design flaw that makes all probes unreliable.  Not
+        only is it difficult to detect, it also moves around in I/O space in
+        response to inb()s from other device probes!
+*/
+/*
+        99/03/03  Allied Telesis RE1000 Plus support by T.Hagawa
+        99/12/30        port to 2.3.35 by K.Takai
+*/
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/mca-legacy.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/crc32.h>
+#include <linux/bitops.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+
+static char version[] __initdata =
+        "at1700.c:v1.15 4/7/98  Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
+
+#define DRV_NAME "at1700"
+
+/* Tunable parameters. */
+
+/* When to switch from the 64-entry multicast filter to Rx-all-multicast. */
+#define MC_FILTERBREAK 64
+
+/* These unusual address orders are used to verify the CONFIG register. */
+
+static int fmv18x_probe_list[] __initdata = {
+        0x220, 0x240, 0x260, 0x280, 0x2a0, 0x2c0, 0x300, 0x340, 0
+};
+
+/*
+ *      ISA
+ */
+
+static unsigned at1700_probe_list[] __initdata = {
+        0x260, 0x280, 0x2a0, 0x240, 0x340, 0x320, 0x380, 0x300, 0
+};
+
+/*
+ *      MCA
+ */
+#ifdef CONFIG_MCA_LEGACY
+static int at1700_ioaddr_pattern[] __initdata = {
+        0x00, 0x04, 0x01, 0x05, 0x02, 0x06, 0x03, 0x07
+};
+
+static int at1700_mca_probe_list[] __initdata = {
+        0x400, 0x1400, 0x2400, 0x3400, 0x4400, 0x5400, 0x6400, 0x7400, 0
+};
+
+static int at1700_irq_pattern[] __initdata = {
+        0x00, 0x00, 0x00, 0x30, 0x70, 0xb0, 0x00, 0x00,
+        0x00, 0xf0, 0x34, 0x74, 0xb4, 0x00, 0x00, 0xf4, 0x00
+};
+#endif
+
+/* use 0 for production, 1 for verification, >2 for debug */
+#ifndef NET_DEBUG
+#define NET_DEBUG 1
+#endif
+static unsigned int net_debug = NET_DEBUG;
+
+typedef unsigned char uchar;
+
+/* Information that need to be kept for each board. */
+struct net_local {
+        struct net_device_stats stats;
+        spinlock_t lock;
+        unsigned char mc_filter[8];
+        uint jumpered:1;                        /* Set iff the board has jumper config. */
+        uint tx_started:1;                      /* Packets are on the Tx queue. */
+        uint tx_queue_ready:1;                  /* Tx queue is ready to be sent. */
+        uint rx_started:1;                      /* Packets are Rxing. */
+        uchar tx_queue;                         /* Number of packet on the Tx queue. */
+        char mca_slot;                          /* -1 means ISA */
+        ushort tx_queue_len;                    /* Current length of the Tx queue. */
+};
+
+
+/* Offsets from the base address. */
+#define STATUS                  0
+#define TX_STATUS               0
+#define RX_STATUS               1
+#define TX_INTR                 2               /* Bit-mapped interrupt enable registers. */
+#define RX_INTR                 3
+#define TX_MODE                 4
+#define RX_MODE                 5
+#define CONFIG_0                6               /* Misc. configuration settings. */
+#define CONFIG_1                7
+/* Run-time register bank 2 definitions. */
+#define DATAPORT                8               /* Word-wide DMA or programmed-I/O dataport. */
+#define TX_START                10
+#define COL16CNTL               11              /* Controll Reg for 16 collisions */
+#define MODE13                  13
+#define RX_CTRL                 14
+/* Configuration registers only on the '865A/B chips. */
+#define EEPROM_Ctrl     16
+#define EEPROM_Data     17
+#define CARDSTATUS      16                      /* FMV-18x Card Status */
+#define CARDSTATUS1     17                      /* FMV-18x Card Status */
+#define IOCONFIG                18              /* Either read the jumper, or move the I/O. */
+#define IOCONFIG1               19
+#define SAPROM                  20              /* The station address PROM, if no EEPROM. */
+#define MODE24                  24
+#define RESET                   31              /* Write to reset some parts of the chip. */
+#define AT1700_IO_EXTENT        32
+#define PORT_OFFSET(o) (o)
+
+
+#define TX_TIMEOUT              10
+
+
+/* Index to functions, as function prototypes. */
+
+static int at1700_probe1(struct net_device *dev, int ioaddr);
+static int read_eeprom(long ioaddr, int location);
+static int net_open(struct net_device *dev);
+static int      net_send_packet(struct sk_buff *skb, struct net_device *dev);
+static irqreturn_t net_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static void net_rx(struct net_device *dev);
+static int net_close(struct net_device *dev);
+static struct net_device_stats *net_get_stats(struct net_device *dev);
+static void set_rx_mode(struct net_device *dev);
+static void net_tx_timeout (struct net_device *dev);
+
+
+#ifdef CONFIG_MCA_LEGACY
+struct at1720_mca_adapters_struct {
+        char* name;
+        int id;
+};
+/* rEnE : maybe there are others I don't know off... */
+
+static struct at1720_mca_adapters_struct at1720_mca_adapters[] __initdata = {
+        { "Allied Telesys AT1720AT",    0x6410 },
+        { "Allied Telesys AT1720BT",    0x6413 },
+        { "Allied Telesys AT1720T",     0x6416 },
+        { NULL, 0 },
+};
+#endif
+
+/* Check for a network adaptor of this type, and return '0' iff one exists.
+   If dev->base_addr == 0, probe all likely locations.
+   If dev->base_addr == 1, always return failure.
+   If dev->base_addr == 2, allocate space for the device and return success
+   (detachable devices only).
+   */
+
+static int io = 0x260;
+
+static int irq;
+
+static void cleanup_card(struct net_device *dev)
+{
+#ifdef CONFIG_MCA_LEGACY
+        struct net_local *lp = netdev_priv(dev);
+        if (lp->mca_slot >= 0)
+                mca_mark_as_unused(lp->mca_slot);
+#endif  
+        free_irq(dev->irq, NULL);
+        release_region(dev->base_addr, AT1700_IO_EXTENT);
+}
+
+struct net_device * __init at1700_probe(int unit)
+{
+        struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
+        unsigned *port;
+        int err = 0;
+
+        if (!dev)
+                return ERR_PTR(-ENODEV);
+
+        if (unit >= 0) {
+                sprintf(dev->name, "eth%d", unit);
+                netdev_boot_setup_check(dev);
+                io = dev->base_addr;
+                irq = dev->irq;
+        } else {
+                dev->base_addr = io;
+                dev->irq = irq;
+        }
+
+        SET_MODULE_OWNER(dev);
+
+        if (io > 0x1ff) {       /* Check a single specified location. */
+                err = at1700_probe1(dev, io);
+        } else if (io != 0) {   /* Don't probe at all. */
+                err = -ENXIO;
+        } else {
+                for (port = at1700_probe_list; *port; port++) {
+                        if (at1700_probe1(dev, *port) == 0)
+                                break;
+                        dev->irq = irq;
+                }
+                if (!*port)
+                        err = -ENODEV;
+        }
+        if (err)
+                goto out;
+        err = register_netdev(dev);
+        if (err)
+                goto out1;
+        return dev;
+out1:
+        cleanup_card(dev);
+out:
+        free_netdev(dev);
+        return ERR_PTR(err);
+}
+
+/* The Fujitsu datasheet suggests that the NIC be probed for by checking its
+   "signature", the default bit pattern after a reset.  This *doesn't* work --
+   there is no way to reset the bus interface without a complete power-cycle!
+
+   It turns out that ATI came to the same conclusion I did: the only thing
+   that can be done is checking a few bits and then diving right into an
+   EEPROM read. */
+
+static int __init at1700_probe1(struct net_device *dev, int ioaddr)
+{
+        char fmv_irqmap[4] = {3, 7, 10, 15};
+        char fmv_irqmap_pnp[8] = {3, 4, 5, 7, 9, 10, 11, 15};
+        char at1700_irqmap[8] = {3, 4, 5, 9, 10, 11, 14, 15};
+        unsigned int i, irq, is_fmv18x = 0, is_at1700 = 0;
+        int slot, ret = -ENODEV;
+        struct net_local *lp = netdev_priv(dev);
+
+        if (!request_region(ioaddr, AT1700_IO_EXTENT, DRV_NAME))
+                return -EBUSY;
+
+        /* Resetting the chip doesn't reset the ISA interface, so don't bother.
+           That means we have to be careful with the register values we probe
+           for.
+         */
+#ifdef notdef
+        printk("at1700 probe at %#x, eeprom is %4.4x %4.4x %4.4x ctrl %4.4x.\n",
+                   ioaddr, read_eeprom(ioaddr, 4), read_eeprom(ioaddr, 5),
+                   read_eeprom(ioaddr, 6), inw(ioaddr + EEPROM_Ctrl));
+#endif
+
+#ifdef CONFIG_MCA_LEGACY
+        /* rEnE (rene@bss.lu): got this from 3c509 driver source , adapted for AT1720 */
+
+    /* Based on Erik Nygren's (nygren@mit.edu) 3c529 patch, heavily
+        modified by Chris Beauregard (cpbeaure@csclub.uwaterloo.ca)
+        to support standard MCA probing. */
+
+        /* redone for multi-card detection by ZP Gu (zpg@castle.net) */
+        /* now works as a module */
+
+        if (MCA_bus) {
+                int j;
+                int l_i;
+                u_char pos3, pos4;
+
+                for (j = 0; at1720_mca_adapters[j].name != NULL; j ++) {
+                        slot = 0;
+                        while (slot != MCA_NOTFOUND) {
+                                
+                                slot = mca_find_unused_adapter( at1720_mca_adapters[j].id, slot );
+                                if (slot == MCA_NOTFOUND) break;
+
+                                /* if we get this far, an adapter has been detected and is
+                                enabled */
+
+                                pos3 = mca_read_stored_pos( slot, 3 );
+                                pos4 = mca_read_stored_pos( slot, 4 );
+
+                                for (l_i = 0; l_i < 0x09; l_i++)
+                                        if (( pos3 & 0x07) == at1700_ioaddr_pattern[l_i])
+                                                break;
+                                ioaddr = at1700_mca_probe_list[l_i];
+                                
+                                for (irq = 0; irq < 0x10; irq++)
+                                        if (((((pos4>>4) & 0x0f) | (pos3 & 0xf0)) & 0xff) == at1700_irq_pattern[irq])
+                                                break;
+
+                                        /* probing for a card at a particular IO/IRQ */
+                                if ((dev->irq && dev->irq != irq) ||
+                                    (dev->base_addr && dev->base_addr != ioaddr)) {
+                                        slot++;         /* probing next slot */
+                                        continue;
+                                }
+
+                                dev->irq = irq;
+                                
+                                /* claim the slot */
+                                mca_set_adapter_name( slot, at1720_mca_adapters[j].name );
+                                mca_mark_as_used(slot);
+
+                                goto found;
+                        }
+                }
+                /* if we get here, we didn't find an MCA adapter - try ISA */
+        }
+#endif
+        slot = -1;
+        /* We must check for the EEPROM-config boards first, else accessing
+           IOCONFIG0 will move the board! */
+        if (at1700_probe_list[inb(ioaddr + IOCONFIG1) & 0x07] == ioaddr
+                && read_eeprom(ioaddr, 4) == 0x0000
+                && (read_eeprom(ioaddr, 5) & 0xff00) == 0xF400)
+                is_at1700 = 1;
+        else if (inb(ioaddr   + SAPROM    ) == 0x00
+                && inb(ioaddr + SAPROM + 1) == 0x00
+                && inb(ioaddr + SAPROM + 2) == 0x0e)
+                is_fmv18x = 1;
+        else {
+                goto err_out;
+        }
+                        
+#ifdef CONFIG_MCA_LEGACY
+found:
+#endif
+
+                /* Reset the internal state machines. */
+        outb(0, ioaddr + RESET);
+
+        if (is_at1700) {
+                irq = at1700_irqmap[(read_eeprom(ioaddr, 12)&0x04)
+                                                   | (read_eeprom(ioaddr, 0)>>14)];
+        } else {
+                /* Check PnP mode for FMV-183/184/183A/184A. */
+                /* This PnP routine is very poor. IO and IRQ should be known. */
+                if (inb(ioaddr + CARDSTATUS1) & 0x20) {
+                        irq = dev->irq;
+                        for (i = 0; i < 8; i++) {
+                                if (irq == fmv_irqmap_pnp[i])
+                                        break;
+                        }
+                        if (i == 8) {
+                                goto err_mca;
+                        }
+                } else {
+                        if (fmv18x_probe_list[inb(ioaddr + IOCONFIG) & 0x07] != ioaddr)
+                                goto err_mca;
+                        irq = fmv_irqmap[(inb(ioaddr + IOCONFIG)>>6) & 0x03];
+                }
+        }
+
+        printk("%s: %s found at %#3x, IRQ %d, address ", dev->name,
+                   is_at1700 ? "AT1700" : "FMV-18X", ioaddr, irq);
+
+        dev->base_addr = ioaddr;
+        dev->irq = irq;
+
+        if (is_at1700) {
+                for(i = 0; i < 3; i++) {
+                        unsigned short eeprom_val = read_eeprom(ioaddr, 4+i);
+                        printk("%04x", eeprom_val);
+                        ((unsigned short *)dev->dev_addr)[i] = ntohs(eeprom_val);
+                }
+        } else {
+                for(i = 0; i < 6; i++) {
+                        unsigned char val = inb(ioaddr + SAPROM + i);
+                        printk("%02x", val);
+                        dev->dev_addr[i] = val;
+                }
+        }
+
+        /* The EEPROM word 12 bit 0x0400 means use regular 100 ohm 10baseT signals,
+           rather than 150 ohm shielded twisted pair compensation.
+           0x0000 == auto-sense the interface
+           0x0800 == use TP interface
+           0x1800 == use coax interface
+           */
+        {
+                const char *porttype[] = {"auto-sense", "10baseT", "auto-sense", "10base2"};
+                if (is_at1700) {
+                        ushort setup_value = read_eeprom(ioaddr, 12);
+                        dev->if_port = setup_value >> 8;
+                } else {
+                        ushort setup_value = inb(ioaddr + CARDSTATUS);
+                        switch (setup_value & 0x07) {
+                        case 0x01: /* 10base5 */
+                        case 0x02: /* 10base2 */
+                                dev->if_port = 0x18; break;
+                        case 0x04: /* 10baseT */
+                                dev->if_port = 0x08; break;
+                        default:   /* auto-sense */
+                                dev->if_port = 0x00; break;
+                        }
+                }
+                printk(" %s interface.\n", porttype[(dev->if_port>>3) & 3]);
+        }
+
+        /* Set the configuration register 0 to 32K 100ns. byte-wide memory, 16 bit
+           bus access, two 4K Tx queues, and disabled Tx and Rx. */
+        outb(0xda, ioaddr + CONFIG_0);
+
+        /* Set the station address in bank zero. */
+        outb(0x00, ioaddr + CONFIG_1);
+        for (i = 0; i < 6; i++)
+                outb(dev->dev_addr[i], ioaddr + PORT_OFFSET(8 + i));
+
+        /* Switch to bank 1 and set the multicast table to accept none. */
+        outb(0x04, ioaddr + CONFIG_1);
+        for (i = 0; i < 8; i++)
+                outb(0x00, ioaddr + PORT_OFFSET(8 + i));
+
+
+        /* Switch to bank 2 */
+        /* Lock our I/O address, and set manual processing mode for 16 collisions. */
+        outb(0x08, ioaddr + CONFIG_1);
+        outb(dev->if_port, ioaddr + MODE13);
+        outb(0x00, ioaddr + COL16CNTL);
+
+        if (net_debug)
+                printk(version);
+
+        memset(lp, 0, sizeof(struct net_local));
+
+        dev->open               = net_open;
+        dev->stop               = net_close;
+        dev->hard_start_xmit = net_send_packet;
+        dev->get_stats  = net_get_stats;
+        dev->set_multicast_list = &set_rx_mode;
+        dev->tx_timeout = net_tx_timeout;
+        dev->watchdog_timeo = TX_TIMEOUT;
+
+        spin_lock_init(&lp->lock);
+
+        lp->jumpered = is_fmv18x;
+        lp->mca_slot = slot;
+        /* Snarf the interrupt vector now. */
+        ret = request_irq(irq, &net_interrupt, 0, DRV_NAME, dev);
+        if (ret) {
+                printk ("  AT1700 at %#3x is unusable due to a conflict on"
+                                "IRQ %d.\n", ioaddr, irq);
+                goto err_mca;
+        }
+
+        return 0;
+
+err_mca:
+#ifdef CONFIG_MCA_LEGACY
+        if (slot >= 0)
+                mca_mark_as_unused(slot);
+#endif
+err_out:
+        release_region(ioaddr, AT1700_IO_EXTENT);
+        return ret;
+}
+
+
+/*  EEPROM_Ctrl bits. */
+#define EE_SHIFT_CLK    0x40    /* EEPROM shift clock, in reg. 16. */
+#define EE_CS                   0x20    /* EEPROM chip select, in reg. 16. */
+#define EE_DATA_WRITE   0x80    /* EEPROM chip data in, in reg. 17. */
+#define EE_DATA_READ    0x80    /* EEPROM chip data out, in reg. 17. */
+
+/* The EEPROM commands include the alway-set leading bit. */
+#define EE_WRITE_CMD    (5 << 6)
+#define EE_READ_CMD             (6 << 6)
+#define EE_ERASE_CMD    (7 << 6)
+
+static int __init read_eeprom(long ioaddr, int location)
+{
+        int i;
+        unsigned short retval = 0;
+        long ee_addr = ioaddr + EEPROM_Ctrl;
+        long ee_daddr = ioaddr + EEPROM_Data;
+        int read_cmd = location | EE_READ_CMD;
+
+        /* Shift the read command bits out. */
+        for (i = 9; i >= 0; i--) {
+                short dataval = (read_cmd & (1 << i)) ? EE_DATA_WRITE : 0;
+                outb(EE_CS, ee_addr);
+                outb(dataval, ee_daddr);
+                outb(EE_CS | EE_SHIFT_CLK, ee_addr);    /* EEPROM clock tick. */
+        }
+        outb(EE_DATA_WRITE, ee_daddr);
+        for (i = 16; i > 0; i--) {
+                outb(EE_CS, ee_addr);
+                outb(EE_CS | EE_SHIFT_CLK, ee_addr);
+                retval = (retval << 1) | ((inb(ee_daddr) & EE_DATA_READ) ? 1 : 0);
+        }
+
+        /* Terminate the EEPROM access. */
+        outb(EE_CS, ee_addr);
+        outb(EE_SHIFT_CLK, ee_addr);
+        outb(0, ee_addr);
+        return retval;
+}
+
+
+
+static int net_open(struct net_device *dev)
+{
+        struct net_local *lp = netdev_priv(dev);
+        int ioaddr = dev->base_addr;
+
+        /* Set the configuration register 0 to 32K 100ns. byte-wide memory, 16 bit
+           bus access, and two 4K Tx queues. */
+        outb(0x5a, ioaddr + CONFIG_0);
+
+        /* Powerup, switch to register bank 2, and enable the Rx and Tx. */
+        outb(0xe8, ioaddr + CONFIG_1);
+
+        lp->tx_started = 0;
+        lp->tx_queue_ready = 1;
+        lp->rx_started = 0;
+        lp->tx_queue = 0;
+        lp->tx_queue_len = 0;
+
+        /* Turn on hardware Tx and Rx interrupts. */
+        outb(0x82, ioaddr + TX_INTR);
+        outb(0x81, ioaddr + RX_INTR);
+
+        /* Enable the IRQ on boards of fmv18x it is feasible. */
+        if (lp->jumpered) {
+                outb(0x80, ioaddr + IOCONFIG1);
+        }
+
+        netif_start_queue(dev);
+        return 0;
+}
+
+static void net_tx_timeout (struct net_device *dev)
+{
+        struct net_local *lp = netdev_priv(dev);
+        int ioaddr = dev->base_addr;
+
+        printk ("%s: transmit timed out with status %04x, %s?\n", dev->name,
+                inw (ioaddr + STATUS), inb (ioaddr + TX_STATUS) & 0x80
+                ? "IRQ conflict" : "network cable problem");
+        printk ("%s: timeout registers: %04x %04x %04x %04x %04x %04x %04x %04x.\n",
+         dev->name, inw(ioaddr + TX_STATUS), inw(ioaddr + TX_INTR), inw(ioaddr + TX_MODE),
+                inw(ioaddr + CONFIG_0), inw(ioaddr + DATAPORT), inw(ioaddr + TX_START),
+                inw(ioaddr + MODE13 - 1), inw(ioaddr + RX_CTRL));
+        lp->stats.tx_errors++;
+        /* ToDo: We should try to restart the adaptor... */
+        outw(0xffff, ioaddr + MODE24);
+        outw (0xffff, ioaddr + TX_STATUS);
+        outb (0x5a, ioaddr + CONFIG_0);
+        outb (0xe8, ioaddr + CONFIG_1);
+        outw (0x8182, ioaddr + TX_INTR);
+        outb (0x00, ioaddr + TX_START);
+        outb (0x03, ioaddr + COL16CNTL);
+
+        dev->trans_start = jiffies;
+
+        lp->tx_started = 0;
+        lp->tx_queue_ready = 1;
+        lp->rx_started = 0;
+        lp->tx_queue = 0;
+        lp->tx_queue_len = 0;
+
+        netif_wake_queue(dev);
+}
+
+
+static int net_send_packet (struct sk_buff *skb, struct net_device *dev)
+{
+        struct net_local *lp = netdev_priv(dev);
+        int ioaddr = dev->base_addr;
+        short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
+        short len = skb->len;
+        unsigned char *buf = skb->data;
+        static u8 pad[ETH_ZLEN];
+
+        netif_stop_queue (dev);
+
+        /* We may not start transmitting unless we finish transferring
+           a packet into the Tx queue. During executing the following
+           codes we possibly catch a Tx interrupt. Thus we flag off
+           tx_queue_ready, so that we prevent the interrupt routine
+           (net_interrupt) to start transmitting. */
+        lp->tx_queue_ready = 0;
+        {
+                outw (length, ioaddr + DATAPORT);
+                /* Packet data */
+                outsw (ioaddr + DATAPORT, buf, len >> 1);
+                /* Check for dribble byte */
+                if (len & 1) {
+                        outw(skb->data[skb->len-1], ioaddr + DATAPORT);
+                        len++;
+                }
+                /* Check for packet padding */
+                if (length != skb->len)
+                        outsw(ioaddr + DATAPORT, pad, (length - len + 1) >> 1);
+
+                lp->tx_queue++;
+                lp->tx_queue_len += length + 2;
+        }
+        lp->tx_queue_ready = 1;
+
+        if (lp->tx_started == 0) {
+                /* If the Tx is idle, always trigger a transmit. */
+                outb (0x80 | lp->tx_queue, ioaddr + TX_START);
+                lp->tx_queue = 0;
+                lp->tx_queue_len = 0;
+                dev->trans_start = jiffies;
+                lp->tx_started = 1;
+                netif_start_queue (dev);
+        } else if (lp->tx_queue_len < 4096 - 1502)
+                /* Yes, there is room for one more packet. */
+                netif_start_queue (dev);
+        dev_kfree_skb (skb);
+
+        return 0;
+}
+
+/* The typical workload of the driver:
+   Handle the network interface interrupts. */
+static irqreturn_t
+net_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+        struct net_device *dev = dev_id;
+        struct net_local *lp;
+        int ioaddr, status;
+        int handled = 0;
+
+        if (dev == NULL) {
+                printk ("at1700_interrupt(): irq %d for unknown device.\n", irq);
+                return IRQ_NONE;
+        }
+
+        ioaddr = dev->base_addr;
+        lp = netdev_priv(dev);
+        
+        spin_lock (&lp->lock);
+        
+        status = inw(ioaddr + TX_STATUS);
+        outw(status, ioaddr + TX_STATUS);
+
+        if (net_debug > 4)
+                printk("%s: Interrupt with status %04x.\n", dev->name, status);
+        if (lp->rx_started == 0 &&
+            (status & 0xff00 || (inb(ioaddr + RX_MODE) & 0x40) == 0)) {
+                /* Got a packet(s).
+                   We cannot execute net_rx more than once at the same time for
+                   the same device. During executing net_rx, we possibly catch a
+                   Tx interrupt. Thus we flag on rx_started, so that we prevent
+                   the interrupt routine (net_interrupt) to dive into net_rx
+                   again. */
+                handled = 1;
+                lp->rx_started = 1;
+                outb(0x00, ioaddr + RX_INTR);   /* Disable RX intr. */
+                net_rx(dev);
+                outb(0x81, ioaddr + RX_INTR);   /* Enable  RX intr. */
+                lp->rx_started = 0;
+        }
+        if (status & 0x00ff) {
+                handled = 1;
+                if (status & 0x02) {
+                        /* More than 16 collisions occurred */
+                        if (net_debug > 4)
+                                printk("%s: 16 Collision occur during Txing.\n", dev->name);
+                        /* Cancel sending a packet. */
+                        outb(0x03, ioaddr + COL16CNTL);
+                        lp->stats.collisions++;
+                }
+                if (status & 0x82) {
+                        lp->stats.tx_packets++;
+                        /* The Tx queue has any packets and is not being
+                           transferred a packet from the host, start
+                           transmitting. */
+                        if (lp->tx_queue && lp->tx_queue_ready) {
+                                outb(0x80 | lp->tx_queue, ioaddr + TX_START);
+                                lp->tx_queue = 0;
+                                lp->tx_queue_len = 0;
+                                dev->trans_start = jiffies;
+                                netif_wake_queue (dev);
+                        } else {
+                                lp->tx_started = 0;
+                                netif_wake_queue (dev);
+                        }
+                }
+        }
+
+        spin_unlock (&lp->lock);
+        return IRQ_RETVAL(handled);
+}
+
+/* We have a good packet(s), get it/them out of the buffers. */
+static void
+net_rx(struct net_device *dev)
+{
+        struct net_local *lp = netdev_priv(dev);
+        int ioaddr = dev->base_addr;
+        int boguscount = 5;
+
+        while ((inb(ioaddr + RX_MODE) & 0x40) == 0) {
+                ushort status = inw(ioaddr + DATAPORT);
+                ushort pkt_len = inw(ioaddr + DATAPORT);
+
+                if (net_debug > 4)
+                        printk("%s: Rxing packet mode %02x status %04x.\n",
+                                   dev->name, inb(ioaddr + RX_MODE), status);
+#ifndef final_version
+                if (status == 0) {
+                        outb(0x05, ioaddr + RX_CTRL);
+                        break;
+                }
+#endif
+
+                if ((status & 0xF0) != 0x20) {  /* There was an error. */
+                        lp->stats.rx_errors++;
+                        if (status & 0x08) lp->stats.rx_length_errors++;
+                        if (status & 0x04) lp->stats.rx_frame_errors++;
+                        if (status & 0x02) lp->stats.rx_crc_errors++;
+                        if (status & 0x01) lp->stats.rx_over_errors++;
+                } else {
+                        /* Malloc up new buffer. */
+                        struct sk_buff *skb;
+
+                        if (pkt_len > 1550) {
+                                printk("%s: The AT1700 claimed a very large packet, size %d.\n",
+                                           dev->name, pkt_len);
+                                /* Prime the FIFO and then flush the packet. */
+                                inw(ioaddr + DATAPORT); inw(ioaddr + DATAPORT);
+                                outb(0x05, ioaddr + RX_CTRL);
+                                lp->stats.rx_errors++;
+                                break;
+                        }
+                        skb = dev_alloc_skb(pkt_len+3);
+                        if (skb == NULL) {
+                                printk("%s: Memory squeeze, dropping packet (len %d).\n",
+                                           dev->name, pkt_len);
+                                /* Prime the FIFO and then flush the packet. */
+                                inw(ioaddr + DATAPORT); inw(ioaddr + DATAPORT);
+                                outb(0x05, ioaddr + RX_CTRL);
+                                lp->stats.rx_dropped++;
+                                break;
+                        }
+                        skb->dev = dev;
+                        skb_reserve(skb,2);
+
+                        insw(ioaddr + DATAPORT, skb_put(skb,pkt_len), (pkt_len + 1) >> 1);
+                        skb->protocol=eth_type_trans(skb, dev);
+                        netif_rx(skb);
+                        dev->last_rx = jiffies;
+                        lp->stats.rx_packets++;
+                        lp->stats.rx_bytes += pkt_len;
+                }
+                if (--boguscount <= 0)
+                        break;
+        }
+
+        /* If any worth-while packets have been received, dev_rint()
+           has done a mark_bh(NET_BH) for us and will work on them
+           when we get to the bottom-half routine. */
+        {
+                int i;
+                for (i = 0; i < 20; i++) {
+                        if ((inb(ioaddr + RX_MODE) & 0x40) == 0x40)
+                                break;
+                        inw(ioaddr + DATAPORT);                         /* dummy status read */
+                        outb(0x05, ioaddr + RX_CTRL);
+                }
+
+                if (net_debug > 5)
+                        printk("%s: Exint Rx packet with mode %02x after %d ticks.\n",
+                                   dev->name, inb(ioaddr + RX_MODE), i);
+        }
+        return;
+}
+
+/* The inverse routine to net_open(). */
+static int net_close(struct net_device *dev)
+{
+        struct net_local *lp = netdev_priv(dev);
+        int ioaddr = dev->base_addr;
+
+        netif_stop_queue(dev);
+
+        /* Set configuration register 0 to disable Tx and Rx. */
+        outb(0xda, ioaddr + CONFIG_0);
+
+        /* No statistic counters on the chip to update. */
+
+        /* Disable the IRQ on boards of fmv18x where it is feasible. */
+        if (lp->jumpered) {
+                outb(0x00, ioaddr + IOCONFIG1);
+                free_irq(dev->irq, dev);
+        }
+
+        /* Power-down the chip.  Green, green, green! */
+        outb(0x00, ioaddr + CONFIG_1);
+        return 0;
+}
+
+/* Get the current statistics.
+   This may be called with the card open or closed.
+   There are no on-chip counters, so this function is trivial.
+*/
+static struct net_device_stats *
+net_get_stats(struct net_device *dev)
+{
+        struct net_local *lp = netdev_priv(dev);
+        return &lp->stats;
+}
+
+/*
+  Set the multicast/promiscuous mode for this adaptor.
+*/
+
+static void
+set_rx_mode(struct net_device *dev)
+{
+        int ioaddr = dev->base_addr;
+        struct net_local *lp = netdev_priv(dev);
+        unsigned char mc_filter[8];              /* Multicast hash filter */
+        unsigned long flags;
+        int i;
+
+        if (dev->flags & IFF_PROMISC) {
+                /* Unconditionally log net taps. */
+                printk("%s: Promiscuous mode enabled.\n", dev->name);
+                memset(mc_filter, 0xff, sizeof(mc_filter));
+                outb(3, ioaddr + RX_MODE);      /* Enable promiscuous mode */
+        } else if (dev->mc_count > MC_FILTERBREAK
+                           ||  (dev->flags & IFF_ALLMULTI)) {
+                /* Too many to filter perfectly -- accept all multicasts. */
+                memset(mc_filter, 0xff, sizeof(mc_filter));
+                outb(2, ioaddr + RX_MODE);      /* Use normal mode. */
+        } else if (dev->mc_count == 0) {
+                memset(mc_filter, 0x00, sizeof(mc_filter));
+                outb(1, ioaddr + RX_MODE);      /* Ignore almost all multicasts. */
+        } else {
+                struct dev_mc_list *mclist;
+                int i;
+
+                memset(mc_filter, 0, sizeof(mc_filter));
+                for (i = 0, mclist = dev->mc_list; mclist && i < dev->mc_count;
+                         i++, mclist = mclist->next) {
+                        unsigned int bit =
+                                ether_crc_le(ETH_ALEN, mclist->dmi_addr) >> 26;
+                        mc_filter[bit >> 3] |= (1 << bit);
+                }
+                outb(0x02, ioaddr + RX_MODE);   /* Use normal mode. */
+        }
+
+        spin_lock_irqsave (&lp->lock, flags);
+        if (memcmp(mc_filter, lp->mc_filter, sizeof(mc_filter))) {
+                int saved_bank = inw(ioaddr + CONFIG_0);
+                /* Switch to bank 1 and set the multicast table. */
+                outw((saved_bank & ~0x0C00) | 0x0480, ioaddr + CONFIG_0);
+                for (i = 0; i < 8; i++)
+                        outb(mc_filter[i], ioaddr + PORT_OFFSET(8 + i));
+                memcpy(lp->mc_filter, mc_filter, sizeof(mc_filter));
+                outw(saved_bank, ioaddr + CONFIG_0);
+        }
+        spin_unlock_irqrestore (&lp->lock, flags);
+        return;
+}
+
+#ifdef MODULE
+static struct net_device *dev_at1700;
+
+module_param(io, int, 0);
+module_param(irq, int, 0);
+module_param(net_debug, int, 0);
+MODULE_PARM_DESC(io, "AT1700/FMV18X I/O base address");
+MODULE_PARM_DESC(irq, "AT1700/FMV18X IRQ number");
+MODULE_PARM_DESC(net_debug, "AT1700/FMV18X debug level (0-6)");
+
+int init_module(void)
+{
+        if (io == 0)
+                printk("at1700: You should not use auto-probing with insmod!\n");
+        dev_at1700 = at1700_probe(-1);
+        if (IS_ERR(dev_at1700))
+                return PTR_ERR(dev_at1700);
+        return 0;
+}
+
+void
+cleanup_module(void)
+{
+        unregister_netdev(dev_at1700);
+        cleanup_card(dev_at1700);
+        free_netdev(dev_at1700);
+}
+#endif /* MODULE */
+MODULE_LICENSE("GPL");
+
+
+/*
+ * Local variables:
+ *  compile-command: "gcc -DMODULE -D__KERNEL__ -Wall -Wstrict-prototypes -O6 -c at1700.c"
+ *  alt-compile-command: "gcc -DMODVERSIONS -DMODULE -D__KERNEL__ -Wall -Wstrict-prototypes -O6 -c at1700.c"
+ *  tab-width: 4
+ *  c-basic-offset: 4
+ *  c-indent-level: 4
+ * End:
+ */
+