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/* ac3200.c: A driver for the Ansel Communications EISA ethernet adaptor. */

/*

        Written 1993, 1994 by Donald Becker.

        Copyright 1993 United States Government as represented by the Director,

        National Security Agency.  This software may only be used and distributed

        according to the terms of the GNU Public License as modified by SRC,

        incorporated herein by reference.

        The author may be reached as becker@cesdis.gsfc.nasa.gov, or

    C/O Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771

        This is driver for the Ansel Communications Model 3200 EISA Ethernet LAN

        Adapter.  The programming information is from the users manual, as related

        by glee@ardnassak.math.clemson.edu.

  */

static const char *version =

        "ac3200.c:v1.01 7/1/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/sched.h>

#include <linux/errno.h>

#include <linux/string.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <asm/system.h>

#include <asm/io.h>

#include "8390.h"

/* Offsets from the base address. */

#define AC_NIC_BASE             0x00

#define AC_SA_PROM              0x16                    /* The station address PROM. */

#define  AC_ADDR0                0x00                   /* Prefix station address values. */

#define  AC_ADDR1                0x40                   /* !!!!These are just guesses!!!! */

#define  AC_ADDR2                0x90

#define AC_ID_PORT              0xC80

#define AC_EISA_ID               0x0110d305

#define AC_RESET_PORT   0xC84

#define  AC_RESET                0x00

#define  AC_ENABLE               0x01

#define AC_CONFIG               0xC90   /* The configuration port. */

#define AC_IO_EXTENT 0x10               /* IS THIS REALLY TRUE ??? */

                                /* Actually accessed is:

                                                                 * AC_NIC_BASE (0-15)

                                                                 * AC_SA_PROM (0-5)

                                                                 * AC_ID_PORT (0-3)

                                                                 * AC_RESET_PORT

                                                                 * AC_CONFIG

                                                                 */

/* Decoding of the configuration register. */

static unsigned char config2irqmap[8] = {15, 12, 11, 10, 9, 7, 5, 3};

static int addrmap[8] =

{0xFF0000, 0xFE0000, 0xFD0000, 0xFFF0000, 0xFFE0000, 0xFFC0000,  0xD0000, 0 };

static const char *port_name[4] = { "10baseT", "invalid", "AUI", "10base2"};

#define config2irq(configval)   config2irqmap[((configval) >> 3) & 7]

#define config2mem(configval)   addrmap[(configval) & 7]

#define config2name(configval)  port_name[((configval) >> 6) & 3]

/* First and last 8390 pages. */

#define AC_START_PG             0x00    /* First page of 8390 TX buffer */

#define AC_STOP_PG              0x80    /* Last page +1 of the 8390 RX ring */

int ac3200_probe(struct device *dev);

static int ac_probe1(int ioaddr, struct device *dev);

static int ac_open(struct device *dev);

static void ac_reset_8390(struct device *dev);

static void ac_block_input(struct device *dev, int count,

                                        struct sk_buff *skb, int ring_offset);

static void ac_block_output(struct device *dev, const int count,

                                                        const unsigned char *buf, const int start_page);

static void ac_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr,

                                        int ring_page);

static int ac_close_card(struct device *dev);

/*      Probe for the AC3200.

        The AC3200 can be identified by either the EISA configuration registers,

        or the unique value in the station address PROM.

        */

int ac3200_probe(struct device *dev)

{

        unsigned short ioaddr = dev->base_addr;

        if (ioaddr > 0x1ff)             /* Check a single specified location. */

                return ac_probe1(ioaddr, dev);

        else if (ioaddr > 0)             /* Don't probe at all. */

                return ENXIO;

        /* If you have a pre 0.99pl15 machine you should delete this line. */

        if ( ! EISA_bus)

                return ENXIO;

        for (ioaddr = 0x1000; ioaddr < 0x9000; ioaddr += 0x1000) {

                if (check_region(ioaddr, AC_IO_EXTENT))

                        continue;

                if (ac_probe1(ioaddr, dev) == 0)

                        return 0;

        }

        return ENODEV;

}

static int ac_probe1(int ioaddr, struct device *dev)

{

        int i;

#ifndef final_version

        printk("AC3200 ethercard probe at %#3x:", ioaddr);

        for(i = 0; i < 6; i++)

                printk(" %02x", inb(ioaddr + AC_SA_PROM + i));

#endif

        /* !!!!The values of AC_ADDRn (see above) should be corrected when we

           find out the correct station address prefix!!!! */

        if (inb(ioaddr + AC_SA_PROM + 0) != AC_ADDR0

                || inb(ioaddr + AC_SA_PROM + 1) != AC_ADDR1

                || inb(ioaddr + AC_SA_PROM + 2) != AC_ADDR2 ) {

#ifndef final_version

                printk(" not found (invalid prefix).\n");

#endif

                return ENODEV;

        }

        /* The correct probe method is to check the EISA ID. */

        for (i = 0; i < 4; i++)

                if (inl(ioaddr + AC_ID_PORT) != AC_EISA_ID) {

                        printk("EISA ID mismatch, %8x vs %8x.\n",

                                   inl(ioaddr + AC_ID_PORT), AC_EISA_ID);

                        return ENODEV;

                }

        /* We should have a "dev" from Space.c or the static module table. */

        if (dev == NULL) {

                printk("ac3200.c: Passed a NULL device.\n");

                dev = init_etherdev(0, 0);

        }

        for(i = 0; i < ETHER_ADDR_LEN; i++)

                dev->dev_addr[i] = inb(ioaddr + AC_SA_PROM + i);

#ifndef final_version

        printk("\nAC3200 ethercard configuration register is %#02x,"

                   " EISA ID %02x %02x %02x %02x.\n", inb(ioaddr + AC_CONFIG),

                   inb(ioaddr + AC_ID_PORT + 0), inb(ioaddr + AC_ID_PORT + 1),

                   inb(ioaddr + AC_ID_PORT + 2), inb(ioaddr + AC_ID_PORT + 3));

#endif

        /* Assign and allocate the interrupt now. */

        if (dev->irq == 0)

                dev->irq = config2irq(inb(ioaddr + AC_CONFIG));

        else if (dev->irq == 2)

                dev->irq = 9;

        if (request_irq(dev->irq, ei_interrupt, 0, "ac3200", NULL)) {

                printk (" unable to get IRQ %d.\n", dev->irq);

                return EAGAIN;

        }

        /* Allocate dev->priv and fill in 8390 specific dev fields. */

        if (ethdev_init(dev)) {

                printk (" unable to allocate memory for dev->priv.\n");

                free_irq(dev->irq, NULL);

                return -ENOMEM;

        }

        request_region(ioaddr, AC_IO_EXTENT, "ac3200");

        dev->base_addr = ioaddr;

#ifdef notyet

        if (dev->mem_start)     {               /* Override the value from the board. */

                for (i = 0; i < 7; i++)

                        if (addrmap[i] == dev->mem_start)

                                break;

                if (i >= 7)

                        i = 0;

                outb((inb(ioaddr + AC_CONFIG) & ~7) | i, ioaddr + AC_CONFIG);

        }

#endif

        dev->if_port = inb(ioaddr + AC_CONFIG) >> 6;

        dev->mem_start = config2mem(inb(ioaddr + AC_CONFIG));

        dev->rmem_start = dev->mem_start + TX_PAGES*256;

        dev->mem_end = dev->rmem_end = dev->mem_start

                + (AC_STOP_PG - AC_START_PG)*256;

        ei_status.name = "AC3200";

        ei_status.tx_start_page = AC_START_PG;

        ei_status.rx_start_page = AC_START_PG + TX_PAGES;

        ei_status.stop_page = AC_STOP_PG;

        ei_status.word16 = 1;

        printk("\n%s: AC3200 at %#x, IRQ %d, %s port, shared memory %#lx-%#lx.\n",

                   dev->name, ioaddr, dev->irq, port_name[dev->if_port],

                   dev->mem_start, dev->mem_end-1);

        if (ei_debug > 0)

                printk(version);

        ei_status.reset_8390 = &ac_reset_8390;

        ei_status.block_input = &ac_block_input;

        ei_status.block_output = &ac_block_output;

        ei_status.get_8390_hdr = &ac_get_8390_hdr;

        dev->open = &ac_open;

        dev->stop = &ac_close_card;

        NS8390_init(dev, 0);

        return 0;

}

static int ac_open(struct device *dev)

{

#ifdef notyet

        /* Someday we may enable the IRQ and shared memory here. */

        int ioaddr = dev->base_addr;

        if (request_irq(dev->irq, ei_interrupt, 0, "ac3200", NULL))

                return -EAGAIN;

#endif

        ei_open(dev);

        MOD_INC_USE_COUNT;

        return 0;

}

static void ac_reset_8390(struct device *dev)

{

        ushort ioaddr = dev->base_addr;

        outb(AC_RESET, ioaddr + AC_RESET_PORT);

        if (ei_debug > 1) printk("resetting AC3200, t=%ld...", jiffies);

        ei_status.txing = 0;

        outb(AC_ENABLE, ioaddr + AC_RESET_PORT);

        if (ei_debug > 1) printk("reset done\n");

        return;

}

/* Grab the 8390 specific header. Similar to the block_input routine, but

   we don't need to be concerned with ring wrap as the header will be at

   the start of a page, so we optimize accordingly. */

static void

ac_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr, int ring_page)

{

        unsigned long hdr_start = dev->mem_start + ((ring_page - AC_START_PG)<<8);

        memcpy_fromio(hdr, hdr_start, sizeof(struct e8390_pkt_hdr));

}

/*  Block input and output are easy on shared memory ethercards, the only

        complication is when the ring buffer wraps. */

static void ac_block_input(struct device *dev, int count, struct sk_buff *skb,

                                                  int ring_offset)

{

        unsigned long xfer_start = dev->mem_start + ring_offset - (AC_START_PG<<8);

        if (xfer_start + count > dev->rmem_end) {

                /* We must wrap the input move. */

                int semi_count = dev->rmem_end - xfer_start;

                memcpy_fromio(skb->data, xfer_start, semi_count);

                count -= semi_count;

                memcpy_fromio(skb->data + semi_count, dev->rmem_start, count);

        } else {

                /* Packet is in one chunk -- we can copy + cksum. */

                eth_io_copy_and_sum(skb, xfer_start, count, 0);

        }

}

static void ac_block_output(struct device *dev, int count,

                                                        const unsigned char *buf, int start_page)

{

        unsigned long shmem = dev->mem_start + ((start_page - AC_START_PG)<<8);

        memcpy_toio(shmem, buf, count);

}

static int ac_close_card(struct device *dev)

{

        dev->start = 0;

        dev->tbusy = 1;

        if (ei_debug > 1)

                printk("%s: Shutting down ethercard.\n", dev->name);

#ifdef notyet

        /* We should someday disable shared memory and interrupts. */

        outb(0x00, ioaddr + 6); /* Disable interrupts. */

        free_irq(dev->irq, NULL);

        irq2dev_map[dev->irq] = 0;

#endif

        ei_close(dev);

        MOD_DEC_USE_COUNT;

        return 0;

}

#ifdef MODULE

#define MAX_AC32_CARDS  4       /* Max number of AC32 cards per module */

#define NAMELEN         8       /* # of chars for storing dev->name */

static char namelist[NAMELEN * MAX_AC32_CARDS] = { 0, };

static struct device dev_ac32[MAX_AC32_CARDS] = {

        {

                NULL,           /* assign a chunk of namelist[] below */

                0, 0, 0, 0,

                0, 0,

                0, 0, 0, NULL, NULL

        },

};

static int io[MAX_AC32_CARDS] = { 0, };

static int irq[MAX_AC32_CARDS]  = { 0, };

static int mem[MAX_AC32_CARDS] = { 0, };

int

init_module(void)

{

        int this_dev, found = 0;

        for (this_dev = 0; this_dev < MAX_AC32_CARDS; this_dev++) {

                struct device *dev = &dev_ac32[this_dev];

                dev->name = namelist+(NAMELEN*this_dev);

                dev->irq = irq[this_dev];

                dev->base_addr = io[this_dev];

                dev->mem_start = mem[this_dev];         /* Currently ignored by driver */

                dev->init = ac3200_probe;

                /* Default is to only install one card. */

                if (io[this_dev] == 0 && this_dev != 0) break;

                if (register_netdev(dev) != 0) {

                        printk(KERN_WARNING "ac3200.c: No ac3200 card found (i/o = 0x%x).\n", io[this_dev]);

                        if (found != 0) return 0; /* Got at least one. */

                        return -ENXIO;

                }

                found++;

        }

        return 0;

}

void

cleanup_module(void)

{

        int this_dev;

        for (this_dev = 0; this_dev < MAX_AC32_CARDS; this_dev++) {

                struct device *dev = &dev_ac32[this_dev];

                if (dev->priv != NULL) {

                        kfree(dev->priv);

                        dev->priv = NULL;

                        /* Someday free_irq + irq2dev may be in ac_close_card() */

                        free_irq(dev->irq, NULL);

                        irq2dev_map[dev->irq] = NULL;

                        release_region(dev->base_addr, AC_IO_EXTENT);

                        unregister_netdev(dev);

                }

        }

}

#endif /* MODULE */

/*

 * Local variables:

 * compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c ac3200.c"

 *  version-control: t

 *  kept-new-versions: 5

 *  tab-width: 4

 * End:

 */