eepro100.c

linux下从网卡远程启动

	txfd.count   = 0x02208000;
	txfd.tx_desc_addr = virt_to_bus(&txfd.tx_buf_addr0);

	txfd.tx_buf_addr0 = virt_to_bus (&hdr);
	txfd.tx_buf_size0 = sizeof (hdr);

	txfd.tx_buf_addr1 = virt_to_bus (p);
	txfd.tx_buf_size1 = s;

#ifdef	DEBUG
	printf ("txfd: \n");
	hd (&txfd, sizeof (txfd));
#endif

	outl(virt_to_bus(&txfd), ioaddr + SCBPointer);
	outw(INT_MASK | CU_START, ioaddr + SCBCmd);
	wait_for_cmd_done(ioaddr + SCBCmd);

	s1 = inw (ioaddr + SCBStatus);
	load_timer2(10*TICKS_PER_MS);		/* timeout 10 ms for transmit */
	while (!txfd.status && timer2_running())
		/* Wait */;
	s2 = inw (ioaddr + SCBStatus);

#ifdef	DEBUG
	printf ("s1 = %hX, s2 = %hX.\n", s1, s2);
#endif
}

/*
 * Sometimes the receiver stops making progress.  This routine knows how to
 * get it going again, without losing packets or being otherwise nasty like
 * a chip reset would be.  Previously the driver had a whole sequence
 * of if RxSuspended, if it's no buffers do one thing, if it's no resources,
 * do another, etc.  But those things don't really matter.  Separate logic
 * in the ISR provides for allocating buffers--the other half of operation
 * is just making sure the receiver is active.  speedo_rx_soft_reset does that.
 * This problem with the old, more involved algorithm is shown up under
 * ping floods on the order of 60K packets/second on a 100Mbps fdx network.
 */
static void
speedo_rx_soft_reset(void)
{
  wait_for_cmd_done(ioaddr + SCBCmd);
	/*
	* Put the hardware into a known state.
	*/
	outb(RX_ABORT, ioaddr + SCBCmd);

	ACCESS(rxfd)rx_buf_addr = 0xffffffff;

  wait_for_cmd_done(ioaddr + SCBCmd);

	outb(RX_START, ioaddr + SCBCmd);
}

/* function: eepro100_poll / eth_poll
 * This recieves a packet from the network.
 *
 * Arguments: none
 *
 * returns:   1 if a packet was recieved.
 *            0 if no pacet was recieved.
 * side effects:
 *            returns the packet in the array nic->packet.
 *            returns the length of the packet in nic->packetlen.
 */

static int eepro100_poll(struct nic *nic)
{
  unsigned int status;
  status = inw(ioaddr + SCBStatus);

	if (!ACCESS(rxfd)status)
		return 0;

  /*
   * The chip may have suspended reception for various reasons.
   * Check for that, and re-prime it should this be the case.
   */
  switch ((status >> 2) & 0xf) {
  case 0: /* Idle */
    break;
  case 1:	/* Suspended */
  case 2:	/* No resources (RxFDs) */
  case 9:	/* Suspended with no more RBDs */
  case 10: /* No resources due to no RBDs */
  case 12: /* Ready with no RBDs */
    speedo_rx_soft_reset();
    break;
  case 3:  case 5:  case 6:  case 7:  case 8:
  case 11:  case 13:  case 14:  case 15:
    /* these are all reserved values */
    break;
  }

	/* Ok. We got a packet. Now restart the reciever.... */
	ACCESS(rxfd)status = 0;
	ACCESS(rxfd)command = 0xc000;
	outl(virt_to_bus(&(ACCESS(rxfd)status)), ioaddr + SCBPointer);
	outw(INT_MASK | RX_START, ioaddr + SCBCmd);
	wait_for_cmd_done(ioaddr + SCBCmd);

#ifdef	DEBUG
	printf ("Got a packet: Len = %d.\n", ACCESS(rxfd)count & 0x3fff);
#endif
	nic->packetlen =  ACCESS(rxfd)count & 0x3fff;
	memcpy (nic->packet, ACCESS(rxfd)packet, nic->packetlen);
#ifdef	DEBUG
	hd (nic->packet, 0x30);
#endif
	return 1;
}

/* function: eepro100_disable
 * resets the card. This is used to allow Etherboot or Linux
 * to probe the card again from a "virginal" state....
 * Arguments: none
 *
 * returns:   void.
 */
static void eepro100_disable(struct dev *dev __unused)
{
/* from eepro100_reset */
	outl(0, ioaddr + SCBPort);
/* from eepro100_disable */
	/* See if this PartialReset solves the problem with interfering with
	   kernel operation after Etherboot hands over. - Ken 20001102 */
	outl(2, ioaddr + SCBPort);

	/* The following is from the Intel e100 driver.
	 * This hopefully solves the problem with hanging hard DOS images. */

	/* wait for the reset to take effect */
	udelay(20);

	/* Mask off our interrupt line -- it is unmasked after reset */
	{
		u16 intr_status;
		/* Disable interrupts on our PCI board by setting the mask bit */
		outw(INT_MASK, ioaddr + SCBCmd);
		intr_status = inw(ioaddr + SCBStatus);
		/* ack and clear intrs */
		outw(intr_status, ioaddr + SCBStatus);
		inw(ioaddr + SCBStatus);
	}
}

/* exported function: eepro100_probe / eth_probe
 * initializes a card
 *
 * side effects:
 *            leaves the ioaddress of the 82557 chip in the variable ioaddr.
 *            leaves the 82557 initialized, and ready to recieve packets.
 */

static int eepro100_probe(struct dev *dev, struct pci_device *p)
{
	struct nic *nic = (struct nic *)dev;
	unsigned short sum = 0;
	int i;
	int read_cmd, ee_size;
	int options;
	int rx_mode;

	/* we cache only the first few words of the EEPROM data
	   be careful not to access beyond this array */
	unsigned short eeprom[16];

	if (p->ioaddr == 0)
		return 0;
	ioaddr = p->ioaddr & ~3; /* Mask the bit that says "this is an io addr" */

	adjust_pci_device(p);

	if ((do_eeprom_cmd(EE_READ_CMD << 24, 27) & 0xffe0000)
		== 0xffe0000) {
		ee_size = 0x100;
		read_cmd = EE_READ_CMD << 24;
	} else {
		ee_size = 0x40;
		read_cmd = EE_READ_CMD << 22;
	}

	for (i = 0, sum = 0; i < ee_size; i++) {
		unsigned short value = do_eeprom_cmd(read_cmd | (i << 16), 27);
		if (i < (int)(sizeof(eeprom)/sizeof(eeprom[0])))
			eeprom[i] = value;
		sum += value;
	}

	for (i=0;i<ETH_ALEN;i++) {
		nic->node_addr[i] =  (eeprom[i/2] >> (8*(i&1))) & 0xff;
	}
	printf ("Ethernet addr: %!\n", nic->node_addr);

	if (sum != 0xBABA)
		printf("eepro100: Invalid EEPROM checksum %#hX, "
		       "check settings before activating this device!\n", sum);
	outl(0, ioaddr + SCBPort);
	udelay (10000);
	whereami ("Got eeprom.");

	/* Base = 0 */
	outl(0, ioaddr + SCBPointer);
	outw(INT_MASK | RX_ADDR_LOAD, ioaddr + SCBCmd);
	wait_for_cmd_done(ioaddr + SCBCmd);
	whereami ("set rx base addr.");

	outl(virt_to_bus(&lstats), ioaddr + SCBPointer);
	outw(INT_MASK | CU_STATSADDR, ioaddr + SCBCmd);
	wait_for_cmd_done(ioaddr + SCBCmd);
	whereami ("set stats addr.");

	/* INIT RX stuff. */
	ACCESS(rxfd)status  = 0x0001;
	ACCESS(rxfd)command = 0x0000;
	ACCESS(rxfd)link    = virt_to_bus(&(ACCESS(rxfd)status));
	ACCESS(rxfd)rx_buf_addr = virt_to_bus(&nic->packet);
	ACCESS(rxfd)count   = 0;
	ACCESS(rxfd)size    = 1528;

	outl(virt_to_bus(&(ACCESS(rxfd)status)), ioaddr + SCBPointer);
	outw(INT_MASK | RX_START, ioaddr + SCBCmd);
	wait_for_cmd_done(ioaddr + SCBCmd);

	whereami ("started RX process.");

	/* Start the reciever.... */
	ACCESS(rxfd)status = 0;
	ACCESS(rxfd)command = 0xc000;
	outl(virt_to_bus(&(ACCESS(rxfd)status)), ioaddr + SCBPointer);
	outw(INT_MASK | RX_START, ioaddr + SCBCmd);

	/* INIT TX stuff. */

	/* Base = 0 */
	outl(0, ioaddr + SCBPointer);
	outw(INT_MASK | CU_CMD_BASE, ioaddr + SCBCmd);
	wait_for_cmd_done(ioaddr + SCBCmd);

	whereami ("set TX base addr.");

	txfd.command      = (CmdIASetup);
	txfd.status       = 0x0000;
	txfd.link         = virt_to_bus (&confcmd);

	{
		char *t = (char *)&txfd.tx_desc_addr;
		
		for (i=0;i<ETH_ALEN;i++)
			t[i] = nic->node_addr[i];
	}

#ifdef	DEBUG
	printf ("Setup_eaddr:\n");
	hd (&txfd, 0x20);
#endif
	/*      options = 0x40; */ /* 10mbps half duplex... */
	options = 0x00;            /* Autosense */

#ifdef PROMISC
	rx_mode = 3;
#elif ALLMULTI
	rx_mode = 1;
#else
	rx_mode = 0;
#endif

	if (   ((eeprom[6]>>8) & 0x3f) == DP83840
	       || ((eeprom[6]>>8) & 0x3f) == DP83840A) {
		int mdi_reg23 = mdio_read(eeprom[6] & 0x1f, 23) | 0x0422;
		if (congenb)
			mdi_reg23 |= 0x0100;
		printf("  DP83840 specific setup, setting register 23 to %hX.\n",
		       mdi_reg23);
		mdio_write(eeprom[6] & 0x1f, 23, mdi_reg23);
	}
	whereami ("Done DP8340 special setup.");
	if (options != 0) {
		mdio_write(eeprom[6] & 0x1f, 0,
			   ((options & 0x20) ? 0x2000 : 0) |    /* 100mbps? */
			   ((options & 0x10) ? 0x0100 : 0)); /* Full duplex? */
		whereami ("set mdio_register.");
	}

	confcmd.command  = CmdSuspend | CmdConfigure;
	confcmd.status   = 0x0000;
	confcmd.link     = virt_to_bus (&txfd);
	confcmd.data[1]  = (txfifo << 4) | rxfifo;
	confcmd.data[4]  = rxdmacount;
	confcmd.data[5]  = txdmacount + 0x80;
	confcmd.data[15] = (rx_mode & 2) ? 0x49: 0x48;
	confcmd.data[19] = (options & 0x10) ? 0xC0 : 0x80;
	confcmd.data[21] = (rx_mode & 1) ? 0x0D: 0x05;

	outl(virt_to_bus(&txfd), ioaddr + SCBPointer);
	outw(INT_MASK | CU_START, ioaddr + SCBCmd);
	wait_for_cmd_done(ioaddr + SCBCmd);

	whereami ("started TX thingy (config, iasetup).");

	load_timer2(10*TICKS_PER_MS);
	while (!txfd.status && timer2_running())
		/* Wait */;

	/* Read the status register once to disgard stale data */
	mdio_read(eeprom[6] & 0x1f, 1);
	/* Check to see if the network cable is plugged in.
	 * This allows for faster failure if there is nothing
	 * we can do.
	 */
	if (!(mdio_read(eeprom[6] & 0x1f, 1) & (1 << 2))) {
		printf("Valid link not established\n");
		eepro100_disable(dev);
		return 0;
	}

	dev->disable  = eepro100_disable;
	nic->poll     = eepro100_poll;
	nic->transmit = eepro100_transmit;
	return 1;
}

/*********************************************************************/

#ifdef	DEBUG

/* Hexdump a number of bytes from memory... */
void hd (void *where, int n)
{
	int i;

	while (n > 0) {
		printf ("%X ", where);
		for (i=0;i < ( (n>16)?16:n);i++)
			printf (" %hhX", ((char *)where)[i]);
		printf ("\n");
		n -= 16;
		where += 16;
	}
}
#endif

static struct pci_id eepro100_nics[] = {
PCI_ROM(0x8086, 0x1029, "id1029",        "Intel EtherExpressPro100 ID1029"),
PCI_ROM(0x8086, 0x1030, "id1030",        "Intel EtherExpressPro100 ID1030"),
PCI_ROM(0x8086, 0x1031, "82801cam",      "Intel 82801CAM (ICH3) Chipset Ethernet Controller"),
PCI_ROM(0x8086, 0x1032, "eepro100-1032", "Intel PRO/100 VE Network Connection"),
PCI_ROM(0x8086, 0x1033, "eepro100-1033", "Intel PRO/100 VM Network Connection"),
PCI_ROM(0x8086, 0x1034, "eepro100-1034", "Intel PRO/100 VM Network Connection"),
PCI_ROM(0x8086, 0x1035, "eepro100-1035", "Intel 82801CAM (ICH3) Chipset Ethernet Controller"),
PCI_ROM(0x8086, 0x1036, "eepro100-1036", "Intel 82801CAM (ICH3) Chipset Ethernet Controller"),
PCI_ROM(0x8086, 0x1037, "eepro100-1037", "Intel 82801CAM (ICH3) Chipset Ethernet Controller"),
PCI_ROM(0x8086, 0x1038, "id1038",        "Intel PRO/100 VM Network Connection"),
PCI_ROM(0x8086, 0x1039, "82562et",       "Intel PRO100 VE 82562ET"),
PCI_ROM(0x8086, 0x103a, "id103a",        "Intel Corporation 82559 InBusiness 10/100"),
PCI_ROM(0x8086, 0x103b, "82562etb",      "Intel PRO100 VE 82562ETB"),
PCI_ROM(0x8086, 0x103c, "eepro100-103c", "Intel PRO/100 VM Network Connection"),
PCI_ROM(0x8086, 0x103d, "eepro100-103d", "Intel PRO/100 VE Network Connection"),
PCI_ROM(0x8086, 0x103e, "eepro100-103e", "Intel PRO/100 VM Network Connection"),
PCI_ROM(0x8086, 0x1059, "82551qm",       "Intel PRO/100 M Mobile Connection"),
PCI_ROM(0x8086, 0x1209, "82559er",       "Intel EtherExpressPro100 82559ER"),
PCI_ROM(0x8086, 0x1227, "82865",         "Intel 82865 EtherExpress PRO/100A"),
PCI_ROM(0x8086, 0x1228, "82556",         "Intel 82556 EtherExpress PRO/100 Smart"),
PCI_ROM(0x8086, 0x1229, "eepro100",      "Intel EtherExpressPro100"),
PCI_ROM(0x8086, 0x2449, "82562em",       "Intel EtherExpressPro100 82562EM"),
PCI_ROM(0x8086, 0x2459, "82562-1",       "Intel 82562 based Fast Ethernet Connection"),
PCI_ROM(0x8086, 0x245d, "82562-2",       "Intel 82562 based Fast Ethernet Connection"),
PCI_ROM(0x8086, 0x1050, "82562ez",       "Intel 82562EZ Network Connection"),
PCI_ROM(0x8086, 0x5200, "eepro100-5200", "Intel EtherExpress PRO/100 Intelligent Server"),
PCI_ROM(0x8086, 0x5201, "eepro100-5201", "Intel EtherExpress PRO/100 Intelligent Server"),
};

/* Cards with device ids 0x1030 to 0x103F, 0x2449, 0x2459 or 0x245D might need
 * a workaround for hardware bug on 10 mbit half duplex (see linux driver eepro100.c)
 * 2003/03/17 gbaum */


static struct pci_driver eepro100_driver __pci_driver = {
	.type      = NIC_DRIVER,
	.name      = "EEPRO100",
	.probe     = eepro100_probe,
	.ids       = eepro100_nics,
	.id_count  = sizeof(eepro100_nics)/sizeof(eepro100_nics[0]),
	.class     = 0
};