3c503.c

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/* 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 Public License,
    incorporated herein by reference.

    The author may be reached as [e-mail], or C/O
    Center of Excellence in Space Data and Information Sciences
       Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771

    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.
    [e-mail] : Fix up PIO interface for efficient operation.

*/

static const char *version =
    "3c503.c:v1.10 9/23/93  Donald Becker ([e-mail])\n";

#include <linux/module.h>

#include <linux/kernel.h>
#include <linux/sched.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 <asm/io.h>
#include <asm/system.h>
#include <asm/byteorder.h>

#include "8390.h"
#include "3c503.h"
#define WRD_COUNT 4

int el2_probe(struct net_device *dev);
int el2_pio_probe(struct net_device *dev);
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);


/* 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.
   */
int __init 
el2_probe(struct net_device *dev)
{
    int *addr, addrs[] = { 0xddffe, 0xd9ffe, 0xcdffe, 0xc9ffe, 0};
    int base_addr = dev->base_addr;

    SET_MODULE_OWNER(dev);
    
    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++) {
	int i;
	unsigned int base_bits = isa_readb(*addr);
	/* Find first set bit. */
	for(i = 7; i >= 0; i--, base_bits >>= 1)
	    if (base_bits & 0x1)
		break;
	if (base_bits != 1)
	    continue;
	if (el2_probe1(dev, netcard_portlist[i]) == 0)
	    return 0;
    }
#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. */
int __init 
el2_pio_probe(struct net_device *dev)
{
    int i;
    int base_addr = dev ? dev->base_addr : 0;

    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;

    return -ENODEV;
}

/* 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. */
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, dev->name))
	return -EBUSY;

    /* Reset and/or avoid any lurking NE2000 */
    if (inb(ioaddr + 0x408) == 0xff) {
    	mdelay(1);
	retval = -ENODEV;
	goto out;
    }

    /* 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 out;
    }
    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 out;
    }

    if (ei_debug  &&  version_printed++ == 0)
	printk(version);

    dev->base_addr = ioaddr;
    /* Allocate dev->priv and fill in 8390 specific dev fields. */
    if (ethdev_init(dev)) {
	printk ("3c503: unable to allocate memory for dev->priv.\n");
	retval = -ENOMEM;
	goto out;
    }

    printk("%s: 3c503 at i/o base %#3x, node ", dev->name, ioaddr);

    /* Retrieve and print the ethernet address. */
    for (i = 0; i < 6; i++)
	printk(" %2.2x", dev->dev_addr[i] = inb(ioaddr + i));

    /* 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) printk(" 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
    printk(", 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";
    } 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
#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. */
	    unsigned long mem_base = dev->mem_start;
	    unsigned int test_val = 0xbbadf00d;
	    isa_writel(0xba5eba5e, mem_base);
	    for (i = sizeof(test_val); i < EL2_MEMSIZE; i+=sizeof(test_val)) {
		isa_writel(test_val, mem_base + i);
		if (isa_readl(mem_base) != 0xba5eba5e
		    || isa_readl(mem_base + i) != test_val) {
		    printk("3c503: memory failure or memory address conflict.\n");
		    dev->mem_start = 0;
		    ei_status.name = "3c503-PIO";
		    break;
		}
		test_val += 0x55555555;
		isa_writel(0, mem_base + i);
	    }
	}
#endif  /* EL2MEMTEST */

	dev->mem_end = dev->rmem_end = dev->mem_start + EL2_MEMSIZE;

	if (wordlength) {	/* No Tx pages to skip over to get to Rx */
		dev->rmem_start = dev->mem_start;
		ei_status.name = "3c503/16";
	} else {
		dev->rmem_start = TX_PAGES*256 + dev->mem_start;
		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) {
	printk("3c503: configured interrupt %d invalid, will use autoIRQ.\n",
	       dev->irq);
	dev->irq = 0;
    }

    ei_status.saved_irq = dev->irq;

    dev->open = &el2_open;
    dev->stop = &el2_close;

    if (dev->mem_start)
	printk("%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;
	printk("\n%s: %s, %dkB RAM, using programmed I/O (REJUMPER for SHARED MEMORY).\n",
	       dev->name, ei_status.name, (wordlength+1)<<3);
    }
    return 0;
out:
    release_region(ioaddr, EL2_IO_EXTENT);
    return retval;
}

static int
el2_open(struct net_device *dev)
{
    int retval = -EAGAIN;

    if (dev->irq < 2) {
	int irqlist[] = {5, 9, 3, 4, 0};
	int *irqp = irqlist;

	outb(EGACFR_NORM, E33G_GACFR);	/* Enable RAM and interrupts. */
	do {
	    if (request_irq (*irqp, NULL, 0, "bogus", dev) != -EBUSY) {
		/* Twinkle the interrupt, and check if it's seen. */
		unsigned long cookie = probe_irq_on();
		outb_p(0x04 << ((*irqp == 9) ? 2 : *irqp), E33G_IDCFR);
		outb_p(0x00, E33G_IDCFR);
		if (*irqp == probe_irq_off(cookie)	/* It's a good IRQ line! */
		    && ((retval = request_irq(dev->irq = *irqp,