1 files changed, 778 insertions, 0 deletions

diff --git a/drivers/net/ethernet/8390/3c503.c b/drivers/net/ethernet/8390/3c503.c
new file mode 100644
index 000000000000..84e68f1b9adf
--- /dev/null
+++ b/drivers/net/ethernet/8390/3c503.c
@@ -0,0 +1,778 @@
+/* 3c503.c: A shared-memory NS8390 ethernet driver for linux. */
+/*
+    Written 1992-94 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 driver should work with the 3c503 and 3c503/16.  It should be used
+    in shared memory mode for best performance, although it may also work
+    in programmed-I/O mode.
+
+    Sources:
+    EtherLink II Technical Reference Manual,
+    EtherLink II/16 Technical Reference Manual Supplement,
+    3Com Corporation, 5400 Bayfront Plaza, Santa Clara CA 95052-8145
+
+    The Crynwr 3c503 packet driver.
+
+    Changelog:
+
+    Paul Gortmaker      : add support for the 2nd 8kB of RAM on 16 bit cards.
+    Paul Gortmaker      : multiple card support for module users.
+    rjohnson@analogic.com : Fix up PIO interface for efficient operation.
+    Jeff Garzik         : ethtool support
+
+*/
+
+#define DRV_NAME        "3c503"
+#define DRV_VERSION     "1.10a"
+#define DRV_RELDATE     "11/17/2001"
+
+
+static const char version[] =
+    DRV_NAME ".c:v" DRV_VERSION " " DRV_RELDATE "  Donald Becker (becker@scyld.com)\n";
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ethtool.h>
+
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/byteorder.h>
+
+#include "8390.h"
+#include "3c503.h"
+#define WRD_COUNT 4
+
+static int el2_pio_probe(struct net_device *dev);
+static int el2_probe1(struct net_device *dev, int ioaddr);
+
+/* A zero-terminated list of I/O addresses to be probed in PIO mode. */
+static unsigned int netcard_portlist[] __initdata =
+        { 0x300,0x310,0x330,0x350,0x250,0x280,0x2a0,0x2e0,0};
+
+#define EL2_IO_EXTENT   16
+
+static int el2_open(struct net_device *dev);
+static int el2_close(struct net_device *dev);
+static void el2_reset_8390(struct net_device *dev);
+static void el2_init_card(struct net_device *dev);
+static void el2_block_output(struct net_device *dev, int count,
+                             const unsigned char *buf, int start_page);
+static void el2_block_input(struct net_device *dev, int count, struct sk_buff *skb,
+                           int ring_offset);
+static void el2_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
+                         int ring_page);
+static const struct ethtool_ops netdev_ethtool_ops;
+
+
+/* This routine probes for a memory-mapped 3c503 board by looking for
+   the "location register" at the end of the jumpered boot PROM space.
+   This works even if a PROM isn't there.
+
+   If the ethercard isn't found there is an optional probe for
+   ethercard jumpered to programmed-I/O mode.
+   */
+static int __init do_el2_probe(struct net_device *dev)
+{
+    int *addr, addrs[] = { 0xddffe, 0xd9ffe, 0xcdffe, 0xc9ffe, 0};
+    int base_addr = dev->base_addr;
+    int irq = dev->irq;
+
+    if (base_addr > 0x1ff)      /* Check a single specified location. */
+        return el2_probe1(dev, base_addr);
+    else if (base_addr != 0)            /* Don't probe at all. */
+        return -ENXIO;
+
+    for (addr = addrs; *addr; addr++) {
+        void __iomem *p = ioremap(*addr, 1);
+        unsigned base_bits;
+        int i;
+
+        if (!p)
+                continue;
+        base_bits = readb(p);
+        iounmap(p);
+        i = ffs(base_bits) - 1;
+        if (i == -1 || base_bits != (1 << i))
+            continue;
+        if (el2_probe1(dev, netcard_portlist[i]) == 0)
+            return 0;
+        dev->irq = irq;
+    }
+#if ! defined(no_probe_nonshared_memory)
+    return el2_pio_probe(dev);
+#else
+    return -ENODEV;
+#endif
+}
+
+/*  Try all of the locations that aren't obviously empty.  This touches
+    a lot of locations, and is much riskier than the code above. */
+static int __init
+el2_pio_probe(struct net_device *dev)
+{
+    int i;
+    int base_addr = dev->base_addr;
+    int irq = dev->irq;
+
+    if (base_addr > 0x1ff)      /* Check a single specified location. */
+        return el2_probe1(dev, base_addr);
+    else if (base_addr != 0)    /* Don't probe at all. */
+        return -ENXIO;
+
+    for (i = 0; netcard_portlist[i]; i++) {
+        if (el2_probe1(dev, netcard_portlist[i]) == 0)
+            return 0;
+        dev->irq = irq;
+    }
+
+    return -ENODEV;
+}
+
+#ifndef MODULE
+struct net_device * __init el2_probe(int unit)
+{
+        struct net_device *dev = alloc_eip_netdev();
+        int err;
+
+        if (!dev)
+                return ERR_PTR(-ENOMEM);
+
+        sprintf(dev->name, "eth%d", unit);
+        netdev_boot_setup_check(dev);
+
+        err = do_el2_probe(dev);
+        if (err)
+                goto out;
+        return dev;
+out:
+        free_netdev(dev);
+        return ERR_PTR(err);
+}
+#endif
+
+static const struct net_device_ops el2_netdev_ops = {
+        .ndo_open               = el2_open,
+        .ndo_stop               = el2_close,
+
+        .ndo_start_xmit         = eip_start_xmit,
+        .ndo_tx_timeout         = eip_tx_timeout,
+        .ndo_get_stats          = eip_get_stats,
+        .ndo_set_multicast_list = eip_set_multicast_list,
+        .ndo_validate_addr      = eth_validate_addr,
+        .ndo_set_mac_address    = eth_mac_addr,
+        .ndo_change_mtu         = eth_change_mtu,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+        .ndo_poll_controller    = eip_poll,
+#endif
+};
+
+/* Probe for the Etherlink II card at I/O port base IOADDR,
+   returning non-zero on success.  If found, set the station
+   address and memory parameters in DEVICE. */
+static int __init
+el2_probe1(struct net_device *dev, int ioaddr)
+{
+    int i, iobase_reg, membase_reg, saved_406, wordlength, retval;
+    static unsigned version_printed;
+    unsigned long vendor_id;
+
+    if (!request_region(ioaddr, EL2_IO_EXTENT, DRV_NAME))
+        return -EBUSY;
+
+    if (!request_region(ioaddr + 0x400, 8, DRV_NAME)) {
+        retval = -EBUSY;
+        goto out;
+    }
+
+    /* Reset and/or avoid any lurking NE2000 */
+    if (inb(ioaddr + 0x408) == 0xff) {
+        mdelay(1);
+        retval = -ENODEV;
+        goto out1;
+    }
+
+    /* We verify that it's a 3C503 board by checking the first three octets
+       of its ethernet address. */
+    iobase_reg = inb(ioaddr+0x403);
+    membase_reg = inb(ioaddr+0x404);
+    /* ASIC location registers should be 0 or have only a single bit set. */
+    if ((iobase_reg  & (iobase_reg - 1)) ||
+        (membase_reg & (membase_reg - 1))) {
+        retval = -ENODEV;
+        goto out1;
+    }
+    saved_406 = inb_p(ioaddr + 0x406);
+    outb_p(ECNTRL_RESET|ECNTRL_THIN, ioaddr + 0x406); /* Reset it... */
+    outb_p(ECNTRL_THIN, ioaddr + 0x406);
+    /* Map the station addr PROM into the lower I/O ports. We now check
+       for both the old and new 3Com prefix */
+    outb(ECNTRL_SAPROM|ECNTRL_THIN, ioaddr + 0x406);
+    vendor_id = inb(ioaddr)*0x10000 + inb(ioaddr + 1)*0x100 + inb(ioaddr + 2);
+    if ((vendor_id != OLD_3COM_ID) && (vendor_id != NEW_3COM_ID)) {
+        /* Restore the register we frobbed. */
+        outb(saved_406, ioaddr + 0x406);
+        retval = -ENODEV;
+        goto out1;
+    }
+
+    if (ei_debug  &&  version_printed++ == 0)
+        pr_debug("%s", version);
+
+    dev->base_addr = ioaddr;
+
+    pr_info("%s: 3c503 at i/o base %#3x, node ", dev->name, ioaddr);
+
+    /* Retrieve and print the ethernet address. */
+    for (i = 0; i < 6; i++)
+        dev->dev_addr[i] = inb(ioaddr + i);
+    pr_cont("%pM", dev->dev_addr);
+
+    /* Map the 8390 back into the window. */
+    outb(ECNTRL_THIN, ioaddr + 0x406);
+
+    /* Check for EL2/16 as described in tech. man. */
+    outb_p(E8390_PAGE0, ioaddr + E8390_CMD);
+    outb_p(0, ioaddr + EN0_DCFG);
+    outb_p(E8390_PAGE2, ioaddr + E8390_CMD);
+    wordlength = inb_p(ioaddr + EN0_DCFG) & ENDCFG_WTS;
+    outb_p(E8390_PAGE0, ioaddr + E8390_CMD);
+
+    /* Probe for, turn on and clear the board's shared memory. */
+    if (ei_debug > 2)
+        pr_cont(" memory jumpers %2.2x ", membase_reg);
+    outb(EGACFR_NORM, ioaddr + 0x405);  /* Enable RAM */
+
+    /* This should be probed for (or set via an ioctl()) at run-time.
+       Right now we use a sleazy hack to pass in the interface number
+       at boot-time via the low bits of the mem_end field.  That value is
+       unused, and the low bits would be discarded even if it was used. */
+#if defined(EI8390_THICK) || defined(EL2_AUI)
+    ei_status.interface_num = 1;
+#else
+    ei_status.interface_num = dev->mem_end & 0xf;
+#endif
+    pr_cont(", using %sternal xcvr.\n", ei_status.interface_num == 0 ? "in" : "ex");
+
+    if ((membase_reg & 0xf0) == 0) {
+        dev->mem_start = 0;
+        ei_status.name = "3c503-PIO";
+        ei_status.mem = NULL;
+    } else {
+        dev->mem_start = ((membase_reg & 0xc0) ? 0xD8000 : 0xC8000) +
+            ((membase_reg & 0xA0) ? 0x4000 : 0);
+#define EL2_MEMSIZE (EL2_MB1_STOP_PG - EL2_MB1_START_PG)*256
+        ei_status.mem = ioremap(dev->mem_start, EL2_MEMSIZE);
+
+#ifdef EL2MEMTEST
+        /* This has never found an error, but someone might care.
+           Note that it only tests the 2nd 8kB on 16kB 3c503/16
+           cards between card addr. 0x2000 and 0x3fff. */
+        {                       /* Check the card's memory. */
+            void __iomem *mem_base = ei_status.mem;
+            unsigned int test_val = 0xbbadf00d;
+            writel(0xba5eba5e, mem_base);
+            for (i = sizeof(test_val); i < EL2_MEMSIZE; i+=sizeof(test_val)) {
+                writel(test_val, mem_base + i);
+                if (readl(mem_base) != 0xba5eba5e ||
+                    readl(mem_base + i) != test_val) {
+                    pr_warning("3c503: memory failure or memory address conflict.\n");
+                    dev->mem_start = 0;
+                    ei_status.name = "3c503-PIO";
+                    iounmap(mem_base);
+                    ei_status.mem = NULL;
+                    break;
+                }
+                test_val += 0x55555555;
+                writel(0, mem_base + i);
+            }
+        }
+#endif  /* EL2MEMTEST */
+
+        if (dev->mem_start)
+                dev->mem_end = dev->mem_start + EL2_MEMSIZE;
+
+        if (wordlength) {       /* No Tx pages to skip over to get to Rx */
+                ei_status.priv = 0;
+                ei_status.name = "3c503/16";
+        } else {
+                ei_status.priv = TX_PAGES * 256;
+                ei_status.name = "3c503";
+        }
+    }
+
+    /*
+        Divide up the memory on the card. This is the same regardless of
+        whether shared-mem or PIO is used. For 16 bit cards (16kB RAM),
+        we use the entire 8k of bank1 for an Rx ring. We only use 3k
+        of the bank0 for 2 full size Tx packet slots. For 8 bit cards,
+        (8kB RAM) we use 3kB of bank1 for two Tx slots, and the remaining
+        5kB for an Rx ring.  */
+
+    if (wordlength) {
+        ei_status.tx_start_page = EL2_MB0_START_PG;
+        ei_status.rx_start_page = EL2_MB1_START_PG;
+    } else {
+        ei_status.tx_start_page = EL2_MB1_START_PG;
+        ei_status.rx_start_page = EL2_MB1_START_PG + TX_PAGES;
+    }
+
+    /* Finish setting the board's parameters. */
+    ei_status.stop_page = EL2_MB1_STOP_PG;
+    ei_status.word16 = wordlength;
+    ei_status.reset_8390 = el2_reset_8390;
+    ei_status.get_8390_hdr = el2_get_8390_hdr;
+    ei_status.block_input = el2_block_input;
+    ei_status.block_output = el2_block_output;
+
+    if (dev->irq == 2)
+        dev->irq = 9;
+    else if (dev->irq > 5 && dev->irq != 9) {
+        pr_warning("3c503: configured interrupt %d invalid, will use autoIRQ.\n",
+               dev->irq);
+        dev->irq = 0;
+    }
+
+    ei_status.saved_irq = dev->irq;
+
+    dev->netdev_ops = &el2_netdev_ops;
+    dev->ethtool_ops = &netdev_ethtool_ops;
+
+    retval = register_netdev(dev);
+    if (retval)
+        goto out1;
+
+    if (dev->mem_start)
+        pr_info("%s: %s - %dkB RAM, 8kB shared mem window at %#6lx-%#6lx.\n",
+                dev->name, ei_status.name, (wordlength+1)<<3,
+                dev->mem_start, dev->mem_end-1);
+
+    else
+    {
+        ei_status.tx_start_page = EL2_MB1_START_PG;
+        ei_status.rx_start_page = EL2_MB1_START_PG + TX_PAGES;
+        pr_info("%s: %s, %dkB RAM, using programmed I/O (REJUMPER for SHARED MEMORY).\n",
+               dev->name, ei_status.name, (wordlength+1)<<3);
+    }
+    release_region(ioaddr + 0x400, 8);
+    return 0;
+out1:
+    release_region(ioaddr + 0x400, 8);
+out:
+    release_region(ioaddr, EL2_IO_EXTENT);
+    return retval;
+}
+
+static irqreturn_t el2_probe_interrupt(int irq, void *seen)
+{
+        *(bool *)seen = true;
+        return IRQ_HANDLED;
+}
+
+static int
+el2_open(struct net_device *dev)
+{
+    int retval;
+
+    if (dev->irq < 2) {
+        static const int irqlist[] = {5, 9, 3, 4, 0};
+        const int *irqp = irqlist;
+
+        outb(EGACFR_NORM, E33G_GACFR);  /* Enable RAM and interrupts. */
+        do {
+                bool seen;
+
+                retval = request_irq(*irqp, el2_probe_interrupt, 0,
+                                     dev->name, &seen);
+                if (retval == -EBUSY)
+                        continue;
+                if (retval < 0)
+                        goto err_disable;
+
+                /* Twinkle the interrupt, and check if it's seen. */
+                seen = false;
+                smp_wmb();
+                outb_p(0x04 << ((*irqp == 9) ? 2 : *irqp), E33G_IDCFR);
+                outb_p(0x00, E33G_IDCFR);
+                msleep(1);
+                free_irq(*irqp, &seen);
+                if (!seen)
+                        continue;
+
+                retval = request_irq(dev->irq = *irqp, eip_interrupt, 0,
+                                     dev->name, dev);
+                if (retval == -EBUSY)
+                        continue;
+                if (retval < 0)
+                        goto err_disable;
+                break;
+        } while (*++irqp);
+
+        if (*irqp == 0) {
+        err_disable:
+            outb(EGACFR_IRQOFF, E33G_GACFR);    /* disable interrupts. */
+            return -EAGAIN;
+        }
+    } else {
+        if ((retval = request_irq(dev->irq, eip_interrupt, 0, dev->name, dev))) {
+            return retval;
+        }
+    }
+
+    el2_init_card(dev);
+    eip_open(dev);
+    return 0;
+}
+
+static int
+el2_close(struct net_device *dev)
+{
+    free_irq(dev->irq, dev);
+    dev->irq = ei_status.saved_irq;
+    outb(EGACFR_IRQOFF, E33G_GACFR);    /* disable interrupts. */
+
+    eip_close(dev);
+    return 0;
+}
+
+/* This is called whenever we have a unrecoverable failure:
+       transmit timeout
+       Bad ring buffer packet header
+ */
+static void
+el2_reset_8390(struct net_device *dev)
+{
+    if (ei_debug > 1) {
+        pr_debug("%s: Resetting the 3c503 board...", dev->name);
+        pr_cont(" %#lx=%#02x %#lx=%#02x %#lx=%#02x...", E33G_IDCFR, inb(E33G_IDCFR),
+               E33G_CNTRL, inb(E33G_CNTRL), E33G_GACFR, inb(E33G_GACFR));
+    }
+    outb_p(ECNTRL_RESET|ECNTRL_THIN, E33G_CNTRL);
+    ei_status.txing = 0;
+    outb_p(ei_status.interface_num==0 ? ECNTRL_THIN : ECNTRL_AUI, E33G_CNTRL);
+    el2_init_card(dev);
+    if (ei_debug > 1)
+        pr_cont("done\n");
+}
+
+/* Initialize the 3c503 GA registers after a reset. */
+static void
+el2_init_card(struct net_device *dev)
+{
+    /* Unmap the station PROM and select the DIX or BNC connector. */
+    outb_p(ei_status.interface_num==0 ? ECNTRL_THIN : ECNTRL_AUI, E33G_CNTRL);
+
+    /* Set ASIC copy of rx's first and last+1 buffer pages */
+    /* These must be the same as in the 8390. */
+    outb(ei_status.rx_start_page, E33G_STARTPG);
+    outb(ei_status.stop_page,  E33G_STOPPG);
+
+    /* Point the vector pointer registers somewhere ?harmless?. */
+    outb(0xff, E33G_VP2);       /* Point at the ROM restart location 0xffff0 */
+    outb(0xff, E33G_VP1);
+    outb(0x00, E33G_VP0);
+    /* Turn off all interrupts until we're opened. */
+    outb_p(0x00,  dev->base_addr + EN0_IMR);
+    /* Enable IRQs iff started. */
+    outb(EGACFR_NORM, E33G_GACFR);
+
+    /* Set the interrupt line. */
+    outb_p((0x04 << (dev->irq == 9 ? 2 : dev->irq)), E33G_IDCFR);
+    outb_p((WRD_COUNT << 1), E33G_DRQCNT);      /* Set burst size to 8 */
+    outb_p(0x20, E33G_DMAAH);   /* Put a valid addr in the GA DMA */
+    outb_p(0x00, E33G_DMAAL);
+    return;                     /* We always succeed */
+}
+
+/*
+ * Either use the shared memory (if enabled on the board) or put the packet
+ * out through the ASIC FIFO.
+ */
+static void
+el2_block_output(struct net_device *dev, int count,
+                 const unsigned char *buf, int start_page)
+{
+    unsigned short int *wrd;
+    int boguscount;             /* timeout counter */
+    unsigned short word;        /* temporary for better machine code */
+    void __iomem *base = ei_status.mem;
+
+    if (ei_status.word16)      /* Tx packets go into bank 0 on EL2/16 card */
+        outb(EGACFR_RSEL|EGACFR_TCM, E33G_GACFR);
+    else
+        outb(EGACFR_NORM, E33G_GACFR);
+
+    if (base) { /* Shared memory transfer */
+        memcpy_toio(base + ((start_page - ei_status.tx_start_page) << 8),
+                        buf, count);
+        outb(EGACFR_NORM, E33G_GACFR);  /* Back to bank1 in case on bank0 */
+        return;
+    }
+
+/*
+ *  No shared memory, put the packet out the other way.
+ *  Set up then start the internal memory transfer to Tx Start Page
+ */
+
+    word = (unsigned short)start_page;
+    outb(word&0xFF, E33G_DMAAH);
+    outb(word>>8, E33G_DMAAL);
+
+    outb_p((ei_status.interface_num ? ECNTRL_AUI : ECNTRL_THIN ) | ECNTRL_OUTPUT
+           | ECNTRL_START, E33G_CNTRL);
+
+/*
+ *  Here I am going to write data to the FIFO as quickly as possible.
+ *  Note that E33G_FIFOH is defined incorrectly. It is really
+ *  E33G_FIFOL, the lowest port address for both the byte and
+ *  word write. Variable 'count' is NOT checked. Caller must supply a
+ *  valid count. Note that I may write a harmless extra byte to the
+ *  8390 if the byte-count was not even.
+ */
+    wrd = (unsigned short int *) buf;
+    count  = (count + 1) >> 1;
+    for(;;)
+    {
+        boguscount = 0x1000;
+        while ((inb(E33G_STATUS) & ESTAT_DPRDY) == 0)
+        {
+            if(!boguscount--)
+            {
+                pr_notice("%s: FIFO blocked in el2_block_output.\n", dev->name);
+                el2_reset_8390(dev);
+                goto blocked;
+            }
+        }
+        if(count > WRD_COUNT)
+        {
+            outsw(E33G_FIFOH, wrd, WRD_COUNT);
+            wrd   += WRD_COUNT;
+            count -= WRD_COUNT;
+        }
+        else
+        {
+            outsw(E33G_FIFOH, wrd, count);
+            break;
+        }
+    }
+    blocked:;
+    outb_p(ei_status.interface_num==0 ? ECNTRL_THIN : ECNTRL_AUI, E33G_CNTRL);
+}
+
+/* Read the 4 byte, page aligned 8390 specific header. */
+static void
+el2_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
+{
+    int boguscount;
+    void __iomem *base = ei_status.mem;
+    unsigned short word;
+
+    if (base) {       /* Use the shared memory. */
+        void __iomem *hdr_start = base + ((ring_page - EL2_MB1_START_PG)<<8);
+        memcpy_fromio(hdr, hdr_start, sizeof(struct e8390_pkt_hdr));
+        hdr->count = le16_to_cpu(hdr->count);
+        return;
+    }
+
+/*
+ *  No shared memory, use programmed I/O.
+ */
+
+    word = (unsigned short)ring_page;
+    outb(word&0xFF, E33G_DMAAH);
+    outb(word>>8, E33G_DMAAL);
+
+    outb_p((ei_status.interface_num == 0 ? ECNTRL_THIN : ECNTRL_AUI) | ECNTRL_INPUT
+           | ECNTRL_START, E33G_CNTRL);
+    boguscount = 0x1000;
+    while ((inb(E33G_STATUS) & ESTAT_DPRDY) == 0)
+    {
+        if(!boguscount--)
+        {
+            pr_notice("%s: FIFO blocked in el2_get_8390_hdr.\n", dev->name);
+            memset(hdr, 0x00, sizeof(struct e8390_pkt_hdr));
+            el2_reset_8390(dev);
+            goto blocked;
+        }
+    }
+    insw(E33G_FIFOH, hdr, (sizeof(struct e8390_pkt_hdr))>> 1);
+    blocked:;
+    outb_p(ei_status.interface_num == 0 ? ECNTRL_THIN : ECNTRL_AUI, E33G_CNTRL);
+}
+
+
+static void
+el2_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
+{
+    int boguscount = 0;
+    void __iomem *base = ei_status.mem;
+    unsigned short int *buf;
+    unsigned short word;
+
+    /* Maybe enable shared memory just be to be safe... nahh.*/
+    if (base) { /* Use the shared memory. */
+        ring_offset -= (EL2_MB1_START_PG<<8);
+        if (ring_offset + count > EL2_MEMSIZE) {
+            /* We must wrap the input move. */
+            int semi_count = EL2_MEMSIZE - ring_offset;
+            memcpy_fromio(skb->data, base + ring_offset, semi_count);
+            count -= semi_count;
+            memcpy_fromio(skb->data + semi_count, base + ei_status.priv, count);
+        } else {
+                memcpy_fromio(skb->data, base + ring_offset, count);
+        }
+        return;
+    }
+
+/*
+ *  No shared memory, use programmed I/O.
+ */
+    word = (unsigned short) ring_offset;
+    outb(word>>8, E33G_DMAAH);
+    outb(word&0xFF, E33G_DMAAL);
+
+    outb_p((ei_status.interface_num == 0 ? ECNTRL_THIN : ECNTRL_AUI) | ECNTRL_INPUT
+           | ECNTRL_START, E33G_CNTRL);
+
+/*
+ *  Here I also try to get data as fast as possible. I am betting that I
+ *  can read one extra byte without clobbering anything in the kernel because
+ *  this would only occur on an odd byte-count and allocation of skb->data
+ *  is word-aligned. Variable 'count' is NOT checked. Caller must check
+ *  for a valid count.
+ *  [This is currently quite safe.... but if one day the 3c503 explodes
+ *   you know where to come looking ;)]
+ */
+
+    buf =  (unsigned short int *) skb->data;
+    count =  (count + 1) >> 1;
+    for(;;)
+    {
+        boguscount = 0x1000;
+        while ((inb(E33G_STATUS) & ESTAT_DPRDY) == 0)
+        {
+            if(!boguscount--)
+            {
+                pr_notice("%s: FIFO blocked in el2_block_input.\n", dev->name);
+                el2_reset_8390(dev);
+                goto blocked;
+            }
+        }
+        if(count > WRD_COUNT)
+        {
+            insw(E33G_FIFOH, buf, WRD_COUNT);
+            buf   += WRD_COUNT;
+            count -= WRD_COUNT;
+        }
+        else
+        {
+            insw(E33G_FIFOH, buf, count);
+            break;
+        }
+    }
+    blocked:;
+    outb_p(ei_status.interface_num == 0 ? ECNTRL_THIN : ECNTRL_AUI, E33G_CNTRL);
+}
+
+
+static void netdev_get_drvinfo(struct net_device *dev,
+                               struct ethtool_drvinfo *info)
+{
+        strcpy(info->driver, DRV_NAME);
+        strcpy(info->version, DRV_VERSION);
+        sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
+}
+
+static const struct ethtool_ops netdev_ethtool_ops = {
+        .get_drvinfo            = netdev_get_drvinfo,
+};
+
+#ifdef MODULE
+#define MAX_EL2_CARDS   4       /* Max number of EL2 cards per module */
+
+static struct net_device *dev_el2[MAX_EL2_CARDS];
+static int io[MAX_EL2_CARDS];
+static int irq[MAX_EL2_CARDS];
+static int xcvr[MAX_EL2_CARDS]; /* choose int. or ext. xcvr */
+module_param_array(io, int, NULL, 0);
+module_param_array(irq, int, NULL, 0);
+module_param_array(xcvr, int, NULL, 0);
+MODULE_PARM_DESC(io, "I/O base address(es)");
+MODULE_PARM_DESC(irq, "IRQ number(s) (assigned)");
+MODULE_PARM_DESC(xcvr, "transceiver(s) (0=internal, 1=external)");
+MODULE_DESCRIPTION("3Com ISA EtherLink II, II/16 (3c503, 3c503/16) driver");
+MODULE_LICENSE("GPL");
+
+/* This is set up so that only a single autoprobe takes place per call.
+ISA device autoprobes on a running machine are not recommended. */
+int __init
+init_module(void)
+{
+        struct net_device *dev;
+        int this_dev, found = 0;
+
+        for (this_dev = 0; this_dev < MAX_EL2_CARDS; this_dev++) {
+                if (io[this_dev] == 0)  {
+                        if (this_dev != 0) break; /* only autoprobe 1st one */
+                        pr_notice("3c503.c: Presently autoprobing (not recommended) for a single card.\n");
+                }
+                dev = alloc_eip_netdev();
+                if (!dev)
+                        break;
+                dev->irq = irq[this_dev];
+                dev->base_addr = io[this_dev];
+                dev->mem_end = xcvr[this_dev];  /* low 4bits = xcvr sel. */
+                if (do_el2_probe(dev) == 0) {
+                        dev_el2[found++] = dev;
+                        continue;
+                }
+                free_netdev(dev);
+                pr_warning("3c503.c: No 3c503 card found (i/o = 0x%x).\n", io[this_dev]);
+                break;
+        }
+        if (found)
+                return 0;
+        return -ENXIO;
+}
+
+static void cleanup_card(struct net_device *dev)
+{
+        /* NB: el2_close() handles free_irq */
+        release_region(dev->base_addr, EL2_IO_EXTENT);
+        if (ei_status.mem)
+                iounmap(ei_status.mem);
+}
+
+void __exit
+cleanup_module(void)
+{
+        int this_dev;
+
+        for (this_dev = 0; this_dev < MAX_EL2_CARDS; this_dev++) {
+                struct net_device *dev = dev_el2[this_dev];
+                if (dev) {
+                        unregister_netdev(dev);
+                        cleanup_card(dev);
+                        free_netdev(dev);
+                }
+        }
+}
+#endif /* MODULE */