nmclan_cs.c

h内核

	if (link->open) {
	  nmclan_reset(dev);
	  netif_device_attach(dev);
	}
      }
      break;
    case CS_EVENT_RESET_REQUEST:
      return 1;
      break;
  }
  return 0;
} /* nmclan_event */

/* ----------------------------------------------------------------------------
nmclan_reset
	Reset and restore all of the Xilinx and MACE registers.
---------------------------------------------------------------------------- */
static void nmclan_reset(struct net_device *dev)
{
  mace_private *lp = netdev_priv(dev);

#if RESET_XILINX
  dev_link_t *link = &lp->link;
  conf_reg_t reg;
  u_long OrigCorValue; 

  /* Save original COR value */
  reg.Function = 0;
  reg.Action = CS_READ;
  reg.Offset = CISREG_COR;
  reg.Value = 0;
  pcmcia_access_configuration_register(link->handle, &reg);
  OrigCorValue = reg.Value;

  /* Reset Xilinx */
  reg.Action = CS_WRITE;
  reg.Offset = CISREG_COR;
  DEBUG(1, "nmclan_reset: OrigCorValue=0x%lX, resetting...\n",
	OrigCorValue);
  reg.Value = COR_SOFT_RESET;
  pcmcia_access_configuration_register(link->handle, &reg);
  /* Need to wait for 20 ms for PCMCIA to finish reset. */

  /* Restore original COR configuration index */
  reg.Value = COR_LEVEL_REQ | (OrigCorValue & COR_CONFIG_MASK);
  pcmcia_access_configuration_register(link->handle, &reg);
  /* Xilinx is now completely reset along with the MACE chip. */
  lp->tx_free_frames=AM2150_MAX_TX_FRAMES;

#endif /* #if RESET_XILINX */

  /* Xilinx is now completely reset along with the MACE chip. */
  lp->tx_free_frames=AM2150_MAX_TX_FRAMES;

  /* Reinitialize the MACE chip for operation. */
  mace_init(lp, dev->base_addr, dev->dev_addr);
  mace_write(lp, dev->base_addr, MACE_IMR, MACE_IMR_DEFAULT);

  /* Restore the multicast list and enable TX and RX. */
  restore_multicast_list(dev);
} /* nmclan_reset */

/* ----------------------------------------------------------------------------
mace_config
	[Someone tell me what this is supposed to do?  Is if_port a defined
	standard?  If so, there should be defines to indicate 1=10Base-T,
	2=10Base-2, etc. including limited automatic detection.]
---------------------------------------------------------------------------- */
static int mace_config(struct net_device *dev, struct ifmap *map)
{
  if ((map->port != (u_char)(-1)) && (map->port != dev->if_port)) {
    if (map->port <= 2) {
      dev->if_port = map->port;
      printk(KERN_INFO "%s: switched to %s port\n", dev->name,
	     if_names[dev->if_port]);
    } else
      return -EINVAL;
  }
  return 0;
} /* mace_config */

/* ----------------------------------------------------------------------------
mace_open
	Open device driver.
---------------------------------------------------------------------------- */
static int mace_open(struct net_device *dev)
{
  kio_addr_t ioaddr = dev->base_addr;
  mace_private *lp = netdev_priv(dev);
  dev_link_t *link = &lp->link;

  if (!DEV_OK(link))
    return -ENODEV;

  link->open++;

  MACEBANK(0);

  netif_start_queue(dev);
  nmclan_reset(dev);

  return 0; /* Always succeed */
} /* mace_open */

/* ----------------------------------------------------------------------------
mace_close
	Closes device driver.
---------------------------------------------------------------------------- */
static int mace_close(struct net_device *dev)
{
  kio_addr_t ioaddr = dev->base_addr;
  mace_private *lp = netdev_priv(dev);
  dev_link_t *link = &lp->link;

  DEBUG(2, "%s: shutting down ethercard.\n", dev->name);

  /* Mask off all interrupts from the MACE chip. */
  outb(0xFF, ioaddr + AM2150_MACE_BASE + MACE_IMR);

  link->open--;
  netif_stop_queue(dev);

  return 0;
} /* mace_close */

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, "PCMCIA 0x%lx", dev->base_addr);
}

#ifdef PCMCIA_DEBUG
static u32 netdev_get_msglevel(struct net_device *dev)
{
	return pc_debug;
}

static void netdev_set_msglevel(struct net_device *dev, u32 level)
{
	pc_debug = level;
}
#endif /* PCMCIA_DEBUG */

static struct ethtool_ops netdev_ethtool_ops = {
	.get_drvinfo		= netdev_get_drvinfo,
#ifdef PCMCIA_DEBUG
	.get_msglevel		= netdev_get_msglevel,
	.set_msglevel		= netdev_set_msglevel,
#endif /* PCMCIA_DEBUG */
};

/* ----------------------------------------------------------------------------
mace_start_xmit
	This routine begins the packet transmit function.  When completed,
	it will generate a transmit interrupt.

	According to /usr/src/linux/net/inet/dev.c, if _start_xmit
	returns 0, the "packet is now solely the responsibility of the
	driver."  If _start_xmit returns non-zero, the "transmission
	failed, put skb back into a list."
---------------------------------------------------------------------------- */

static void mace_tx_timeout(struct net_device *dev)
{
  mace_private *lp = netdev_priv(dev);
  dev_link_t *link = &lp->link;

  printk(KERN_NOTICE "%s: transmit timed out -- ", dev->name);
#if RESET_ON_TIMEOUT
  printk("resetting card\n");
  pcmcia_reset_card(link->handle, NULL);
#else /* #if RESET_ON_TIMEOUT */
  printk("NOT resetting card\n");
#endif /* #if RESET_ON_TIMEOUT */
  dev->trans_start = jiffies;
  netif_wake_queue(dev);
}

static int mace_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
  mace_private *lp = netdev_priv(dev);
  kio_addr_t ioaddr = dev->base_addr;

  netif_stop_queue(dev);

  DEBUG(3, "%s: mace_start_xmit(length = %ld) called.\n",
	dev->name, (long)skb->len);

#if (!TX_INTERRUPTABLE)
  /* Disable MACE TX interrupts. */
  outb(MACE_IMR_DEFAULT | MACE_IR_XMTINT,
    ioaddr + AM2150_MACE_BASE + MACE_IMR);
  lp->tx_irq_disabled=1;
#endif /* #if (!TX_INTERRUPTABLE) */

  {
    /* This block must not be interrupted by another transmit request!
       mace_tx_timeout will take care of timer-based retransmissions from
       the upper layers.  The interrupt handler is guaranteed never to
       service a transmit interrupt while we are in here.
    */

    lp->linux_stats.tx_bytes += skb->len;
    lp->tx_free_frames--;

    /* WARNING: Write the _exact_ number of bytes written in the header! */
    /* Put out the word header [must be an outw()] . . . */
    outw(skb->len, ioaddr + AM2150_XMT);
    /* . . . and the packet [may be any combination of outw() and outb()] */
    outsw(ioaddr + AM2150_XMT, skb->data, skb->len >> 1);
    if (skb->len & 1) {
      /* Odd byte transfer */
      outb(skb->data[skb->len-1], ioaddr + AM2150_XMT);
    }

    dev->trans_start = jiffies;

#if MULTI_TX
    if (lp->tx_free_frames > 0)
      netif_start_queue(dev);
#endif /* #if MULTI_TX */
  }

#if (!TX_INTERRUPTABLE)
  /* Re-enable MACE TX interrupts. */
  lp->tx_irq_disabled=0;
  outb(MACE_IMR_DEFAULT, ioaddr + AM2150_MACE_BASE + MACE_IMR);
#endif /* #if (!TX_INTERRUPTABLE) */

  dev_kfree_skb(skb);

  return 0;
} /* mace_start_xmit */

/* ----------------------------------------------------------------------------
mace_interrupt
	The interrupt handler.
---------------------------------------------------------------------------- */
static irqreturn_t mace_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
  struct net_device *dev = (struct net_device *) dev_id;
  mace_private *lp = netdev_priv(dev);
  kio_addr_t ioaddr = dev->base_addr;
  int status;
  int IntrCnt = MACE_MAX_IR_ITERATIONS;

  if (dev == NULL) {
    DEBUG(2, "mace_interrupt(): irq 0x%X for unknown device.\n",
	  irq);
    return IRQ_NONE;
  }

  if (lp->tx_irq_disabled) {
    printk(
      (lp->tx_irq_disabled?
       KERN_NOTICE "%s: Interrupt with tx_irq_disabled "
       "[isr=%02X, imr=%02X]\n": 
       KERN_NOTICE "%s: Re-entering the interrupt handler "
       "[isr=%02X, imr=%02X]\n"),
      dev->name,
      inb(ioaddr + AM2150_MACE_BASE + MACE_IR),
      inb(ioaddr + AM2150_MACE_BASE + MACE_IMR)
    );
    /* WARNING: MACE_IR has been read! */
    return IRQ_NONE;
  }

  if (!netif_device_present(dev)) {
    DEBUG(2, "%s: interrupt from dead card\n", dev->name);
    return IRQ_NONE;
  }

  do {
    /* WARNING: MACE_IR is a READ/CLEAR port! */
    status = inb(ioaddr + AM2150_MACE_BASE + MACE_IR);

    DEBUG(3, "mace_interrupt: irq 0x%X status 0x%X.\n", irq, status);

    if (status & MACE_IR_RCVINT) {
      mace_rx(dev, MACE_MAX_RX_ITERATIONS);
    }

    if (status & MACE_IR_XMTINT) {
      unsigned char fifofc;
      unsigned char xmtrc;
      unsigned char xmtfs;

      fifofc = inb(ioaddr + AM2150_MACE_BASE + MACE_FIFOFC);
      if ((fifofc & MACE_FIFOFC_XMTFC)==0) {
	lp->linux_stats.tx_errors++;
	outb(0xFF, ioaddr + AM2150_XMT_SKIP);
      }

      /* Transmit Retry Count (XMTRC, reg 4) */
      xmtrc = inb(ioaddr + AM2150_MACE_BASE + MACE_XMTRC);
      if (xmtrc & MACE_XMTRC_EXDEF) lp->mace_stats.exdef++;
      lp->mace_stats.xmtrc += (xmtrc & MACE_XMTRC_XMTRC);

      if (
        (xmtfs = inb(ioaddr + AM2150_MACE_BASE + MACE_XMTFS)) &
        MACE_XMTFS_XMTSV /* Transmit Status Valid */
      ) {
	lp->mace_stats.xmtsv++;

	if (xmtfs & ~MACE_XMTFS_XMTSV) {
	  if (xmtfs & MACE_XMTFS_UFLO) {
	    /* Underflow.  Indicates that the Transmit FIFO emptied before
	       the end of frame was reached. */
	    lp->mace_stats.uflo++;
	  }
	  if (xmtfs & MACE_XMTFS_LCOL) {
	    /* Late Collision */
	    lp->mace_stats.lcol++;
	  }
	  if (xmtfs & MACE_XMTFS_MORE) {
	    /* MORE than one retry was needed */
	    lp->mace_stats.more++;
	  }
	  if (xmtfs & MACE_XMTFS_ONE) {
	    /* Exactly ONE retry occurred */
	    lp->mace_stats.one++;
	  }
	  if (xmtfs & MACE_XMTFS_DEFER) {
	    /* Transmission was defered */
	    lp->mace_stats.defer++;
	  }
	  if (xmtfs & MACE_XMTFS_LCAR) {
	    /* Loss of carrier */
	    lp->mace_stats.lcar++;
	  }
	  if (xmtfs & MACE_XMTFS_RTRY) {
	    /* Retry error: transmit aborted after 16 attempts */
	    lp->mace_stats.rtry++;
	  }
        } /* if (xmtfs & ~MACE_XMTFS_XMTSV) */

      } /* if (xmtfs & MACE_XMTFS_XMTSV) */

      lp->linux_stats.tx_packets++;
      lp->tx_free_frames++;
      netif_wake_queue(dev);
    } /* if (status & MACE_IR_XMTINT) */

    if (status & ~MACE_IMR_DEFAULT & ~MACE_IR_RCVINT & ~MACE_IR_XMTINT) {
      if (status & MACE_IR_JAB) {
        /* Jabber Error.  Excessive transmit duration (20-150ms). */
        lp->mace_stats.jab++;
      }
      if (status & MACE_IR_BABL) {
        /* Babble Error.  >1518 bytes transmitted. */
        lp->mace_stats.babl++;
      }
      if (status & MACE_IR_CERR) {
	/* Collision Error.  CERR indicates the absence of the
	   Signal Quality Error Test message after a packet
	   transmission. */
        lp->mace_stats.cerr++;
      }
      if (status & MACE_IR_RCVCCO) {
        /* Receive Collision Count Overflow; */
        lp->mace_stats.rcvcco++;
      }
      if (status & MACE_IR_RNTPCO) {
        /* Runt Packet Count Overflow */
        lp->mace_stats.rntpco++;
      }
      if (status & MACE_IR_MPCO) {
        /* Missed Packet Count Overflow */
        lp->mace_stats.mpco++;
      }
    } /* if (status & ~MACE_IMR_DEFAULT & ~MACE_IR_RCVINT & ~MACE_IR_XMTINT) */

  } while ((status & ~MACE_IMR_DEFAULT) && (--IntrCnt));

  return IRQ_HANDLED;
} /* mace_interrupt */

/* ----------------------------------------------------------------------------
mace_rx
	Receives packets.
---------------------------------------------------------------------------- */
static int mace_rx(struct net_device *dev, unsigned char RxCnt)
{
  mace_private *lp = netdev_priv(dev);
  kio_addr_t ioaddr = dev->base_addr;
  unsigned char rx_framecnt;
  unsigned short rx_status;

  while (
    ((rx_framecnt = inb(ioaddr + AM2150_RCV_FRAME_COUNT)) > 0) &&
    (rx_framecnt <= 12) && /* rx_framecnt==0xFF if card is extracted. */
    (RxCnt--)
  ) {
    rx_status = inw(ioaddr + AM2150_RCV);

    DEBUG(3, "%s: in mace_rx(), framecnt 0x%X, rx_status"
	  " 0x%X.\n", dev->name, rx_framecnt, rx_status);

    if (rx_status & MACE_RCVFS_RCVSTS) { /* Error, update stats. */
      lp->linux_stats.rx_errors++;
      if (rx_status & MACE_RCVFS_OFLO) {
        lp->mace_stats.oflo++;
      }
      if (rx_status & MACE_RCVFS_CLSN) {
        lp->mace_stats.clsn++;
      }
      if (rx_status & MACE_RCVFS_FRAM) {
	lp->mace_stats.fram++;
      }
      if (rx_status & MACE_RCVFS_FCS) {
        lp->mace_stats.fcs++;
      }
    } else {
      short pkt_len = (rx_status & ~MACE_RCVFS_RCVSTS) - 4;
        /* Auto Strip is off, always subtract 4 */
      struct sk_buff *skb;

      lp->mace_stats.rfs_rntpc += inb(ioaddr + AM2150_RCV);
        /* runt packet count */
      lp->mace_stats.rfs_rcvcc += inb(ioaddr + AM2150_RCV);
        /* rcv collision count */

      DEBUG(3, "    receiving packet size 0x%X rx_status"