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ether1.c

/*
 *  linux/drivers/acorn/net/ether1.c
 *
 *  Copyright (C) 1996-2000 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  Acorn ether1 driver (82586 chip) for Acorn machines
 *
 * We basically keep two queues in the cards memory - one for transmit
 * and one for receive.  Each has a head and a tail.  The head is where
 * we/the chip adds packets to be transmitted/received, and the tail
 * is where the transmitter has got to/where the receiver will stop.
 * Both of these queues are circular, and since the chip is running
 * all the time, we have to be careful when we modify the pointers etc
 * so that the buffer memory contents is valid all the time.
 *
 * Change log:
 * 1.00     RMK               Released
 * 1.01     RMK   19/03/1996  Transfers the last odd byte onto/off of the card now.
 * 1.02     RMK   25/05/1997  Added code to restart RU if it goes not ready
 * 1.03     RMK   14/09/1997  Cleaned up the handling of a reset during the TX interrupt.
 *                      Should prevent lockup.
 * 1.04 RMK 17/09/1997  Added more info when initialsation of chip goes wrong.
 *                      TDR now only reports failure when chip reports non-zero
 *                      TDR time-distance.
 * 1.05     RMK   31/12/1997  Removed calls to dev_tint for 2.1
 * 1.06     RMK   10/02/2000  Updated for 2.3.43
 * 1.07     RMK   13/05/2000  Updated for 2.3.99-pre8
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/bitops.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/ecard.h>

#define __ETHER1_C
#include "ether1.h"

static unsigned int net_debug = NET_DEBUG;

#define BUFFER_SIZE     0x10000
#define TX_AREA_START   0x00100
#define TX_AREA_END     0x05000
#define RX_AREA_START   0x05000
#define RX_AREA_END     0x0fc00

static int ether1_open(struct net_device *dev);
static int ether1_sendpacket(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t ether1_interrupt(int irq, void *dev_id);
static int ether1_close(struct net_device *dev);
static struct net_device_stats *ether1_getstats(struct net_device *dev);
static void ether1_setmulticastlist(struct net_device *dev);
static void ether1_timeout(struct net_device *dev);

/* ------------------------------------------------------------------------- */

static char version[] __devinitdata = "ether1 ethernet driver (c) 2000 Russell King v1.07\n";

#define BUS_16 16
#define BUS_8  8

/* ------------------------------------------------------------------------- */

#define DISABLEIRQS 1
#define NORMALIRQS  0

#define ether1_readw(dev, addr, type, offset, svflgs) ether1_inw_p (dev, addr + (int)(&((type *)0)->offset), svflgs)
#define ether1_writew(dev, val, addr, type, offset, svflgs) ether1_outw_p (dev, val, addr + (int)(&((type *)0)->offset), svflgs)

static inline unsigned short
ether1_inw_p (struct net_device *dev, int addr, int svflgs)
{
      unsigned long flags;
      unsigned short ret;

      if (svflgs)
            local_irq_save (flags);

      writeb(addr >> 12, REG_PAGE);
      ret = readw(ETHER1_RAM + ((addr & 4095) << 1));
      if (svflgs)
            local_irq_restore (flags);
      return ret;
}

static inline void
ether1_outw_p (struct net_device *dev, unsigned short val, int addr, int svflgs)
{
      unsigned long flags;

      if (svflgs)
            local_irq_save (flags);

      writeb(addr >> 12, REG_PAGE);
      writew(val, ETHER1_RAM + ((addr & 4095) << 1));
      if (svflgs)
            local_irq_restore (flags);
}

/*
 * Some inline assembler to allow fast transfers on to/off of the card.
 * Since this driver depends on some features presented by the ARM
 * specific architecture, and that you can't configure this driver
 * without specifiing ARM mode, this is not a problem.
 *
 * This routine is essentially an optimised memcpy from the card's
 * onboard RAM to kernel memory.
 */
static void
ether1_writebuffer (struct net_device *dev, void *data, unsigned int start, unsigned int length)
{
      unsigned int page, thislen, offset;
      void __iomem *addr;

      offset = start & 4095;
      page = start >> 12;
      addr = ETHER1_RAM + (offset << 1);

      if (offset + length > 4096)
            thislen = 4096 - offset;
      else
            thislen = length;

      do {
            int used;

            writeb(page, REG_PAGE);
            length -= thislen;

            __asm__ __volatile__(
      "subs %3, %3, #2\n\
      bmi   2f\n\
1:    ldr   %0, [%1], #2\n\
      mov   %0, %0, lsl #16\n\
      orr   %0, %0, %0, lsr #16\n\
      str   %0, [%2], #4\n\
      subs  %3, %3, #2\n\
      bmi   2f\n\
      ldr   %0, [%1], #2\n\
      mov   %0, %0, lsl #16\n\
      orr   %0, %0, %0, lsr #16\n\
      str   %0, [%2], #4\n\
      subs  %3, %3, #2\n\
      bmi   2f\n\
      ldr   %0, [%1], #2\n\
      mov   %0, %0, lsl #16\n\
      orr   %0, %0, %0, lsr #16\n\
      str   %0, [%2], #4\n\
      subs  %3, %3, #2\n\
      bmi   2f\n\
      ldr   %0, [%1], #2\n\
      mov   %0, %0, lsl #16\n\
      orr   %0, %0, %0, lsr #16\n\
      str   %0, [%2], #4\n\
      subs  %3, %3, #2\n\
      bpl   1b\n\
2:    adds  %3, %3, #1\n\
      ldreqb      %0, [%1]\n\
      streqb      %0, [%2]"
            : "=&r" (used), "=&r" (data)
            : "r"  (addr), "r" (thislen), "1" (data));

            addr = ETHER1_RAM;

            thislen = length;
            if (thislen > 4096)
                  thislen = 4096;
            page++;
      } while (thislen);
}

static void
ether1_readbuffer (struct net_device *dev, void *data, unsigned int start, unsigned int length)
{
      unsigned int page, thislen, offset;
      void __iomem *addr;

      offset = start & 4095;
      page = start >> 12;
      addr = ETHER1_RAM + (offset << 1);

      if (offset + length > 4096)
            thislen = 4096 - offset;
      else
            thislen = length;

      do {
            int used;

            writeb(page, REG_PAGE);
            length -= thislen;

            __asm__ __volatile__(
      "subs %3, %3, #2\n\
      bmi   2f\n\
1:    ldr   %0, [%2], #4\n\
      strb  %0, [%1], #1\n\
      mov   %0, %0, lsr #8\n\
      strb  %0, [%1], #1\n\
      subs  %3, %3, #2\n\
      bmi   2f\n\
      ldr   %0, [%2], #4\n\
      strb  %0, [%1], #1\n\
      mov   %0, %0, lsr #8\n\
      strb  %0, [%1], #1\n\
      subs  %3, %3, #2\n\
      bmi   2f\n\
      ldr   %0, [%2], #4\n\
      strb  %0, [%1], #1\n\
      mov   %0, %0, lsr #8\n\
      strb  %0, [%1], #1\n\
      subs  %3, %3, #2\n\
      bmi   2f\n\
      ldr   %0, [%2], #4\n\
      strb  %0, [%1], #1\n\
      mov   %0, %0, lsr #8\n\
      strb  %0, [%1], #1\n\
      subs  %3, %3, #2\n\
      bpl   1b\n\
2:    adds  %3, %3, #1\n\
      ldreqb      %0, [%2]\n\
      streqb      %0, [%1]"
            : "=&r" (used), "=&r" (data)
            : "r"  (addr), "r" (thislen), "1" (data));

            addr = ETHER1_RAM;

            thislen = length;
            if (thislen > 4096)
                  thislen = 4096;
            page++;
      } while (thislen);
}

static int __devinit
ether1_ramtest(struct net_device *dev, unsigned char byte)
{
      unsigned char *buffer = kmalloc (BUFFER_SIZE, GFP_KERNEL);
      int i, ret = BUFFER_SIZE;
      int max_errors = 15;
      int bad = -1;
      int bad_start = 0;

      if (!buffer)
            return 1;

      memset (buffer, byte, BUFFER_SIZE);
      ether1_writebuffer (dev, buffer, 0, BUFFER_SIZE);
      memset (buffer, byte ^ 0xff, BUFFER_SIZE);
      ether1_readbuffer (dev, buffer, 0, BUFFER_SIZE);

      for (i = 0; i < BUFFER_SIZE; i++) {
            if (buffer[i] != byte) {
                  if (max_errors >= 0 && bad != buffer[i]) {
                        if (bad != -1)
                              printk ("\n");
                        printk (KERN_CRIT "%s: RAM failed with (%02X instead of %02X) at 0x%04X",
                              dev->name, buffer[i], byte, i);
                        ret = -ENODEV;
                        max_errors --;
                        bad = buffer[i];
                        bad_start = i;
                  }
            } else {
                  if (bad != -1) {
                        if (bad_start == i - 1)
                              printk ("\n");
                        else
                              printk (" - 0x%04X\n", i - 1);
                        bad = -1;
                  }
            }
      }

      if (bad != -1)
            printk (" - 0x%04X\n", BUFFER_SIZE);
      kfree (buffer);

      return ret;
}

static int
ether1_reset (struct net_device *dev)
{
      writeb(CTRL_RST|CTRL_ACK, REG_CONTROL);
      return BUS_16;
}

static int __devinit
ether1_init_2(struct net_device *dev)
{
      int i;
      dev->mem_start = 0;

      i = ether1_ramtest (dev, 0x5a);

      if (i > 0)
            i = ether1_ramtest (dev, 0x1e);

      if (i <= 0)
            return -ENODEV;

      dev->mem_end = i;
      return 0;
}

/*
 * These are the structures that are loaded into the ether RAM card to
 * initialise the 82586
 */

/* at 0x0100 */
#define NOP_ADDR  (TX_AREA_START)
#define NOP_SIZE  (0x06)
static nop_t  init_nop  = {
      0,
      CMD_NOP,
      NOP_ADDR
};

/* at 0x003a */
#define TDR_ADDR  (0x003a)
#define TDR_SIZE  (0x08)
static tdr_t  init_tdr  = {
      0,
      CMD_TDR | CMD_INTR,
      NOP_ADDR,
      0
};

/* at 0x002e */
#define MC_ADDR         (0x002e)
#define MC_SIZE         (0x0c)
static mc_t   init_mc   = {
      0,
      CMD_SETMULTICAST,
      TDR_ADDR,
      0,
      { { 0, } }
};

/* at 0x0022 */
#define SA_ADDR         (0x0022)
#define SA_SIZE         (0x0c)
static sa_t   init_sa   = {
      0,
      CMD_SETADDRESS,
      MC_ADDR,
      { 0, }
};

/* at 0x0010 */
#define CFG_ADDR  (0x0010)
#define CFG_SIZE  (0x12)
static cfg_t  init_cfg  = {
      0,
      CMD_CONFIG,
      SA_ADDR,
      8,
      8,
      CFG8_SRDY,
      CFG9_PREAMB8 | CFG9_ADDRLENBUF | CFG9_ADDRLEN(6),
      0,
      0x60,
      0,
      CFG13_RETRY(15) | CFG13_SLOTH(2),
      0,
};

/* at 0x0000 */
#define SCB_ADDR  (0x0000)
#define SCB_SIZE  (0x10)
static scb_t  init_scb  = {
      0,
      SCB_CMDACKRNR | SCB_CMDACKCNA | SCB_CMDACKFR | SCB_CMDACKCX,
      CFG_ADDR,
      RX_AREA_START,
      0,
      0,
      0,
      0
};

/* at 0xffee */
#define ISCP_ADDR (0xffee)
#define ISCP_SIZE (0x08)
static iscp_t init_iscp = {
      1,
      SCB_ADDR,
      0x0000,
      0x0000
};

/* at 0xfff6 */
#define SCP_ADDR  (0xfff6)
#define SCP_SIZE  (0x0a)
static scp_t  init_scp  = {
      SCP_SY_16BBUS,
      { 0, 0 },
      ISCP_ADDR,
      0
};

#define RFD_SIZE  (0x16)
static rfd_t  init_rfd  = {
      0,
      0,
      0,
      0,
      { 0, },
      { 0, },
      0
};

#define RBD_SIZE  (0x0a)
static rbd_t  init_rbd  = {
      0,
      0,
      0,
      0,
      ETH_FRAME_LEN + 8
};

#define TX_SIZE         (0x08)
#define TBD_SIZE  (0x08)

static int
ether1_init_for_open (struct net_device *dev)
{
      int i, status, addr, next, next2;
      int failures = 0;
      unsigned long timeout;

      writeb(CTRL_RST|CTRL_ACK, REG_CONTROL);

      for (i = 0; i < 6; i++)
            init_sa.sa_addr[i] = dev->dev_addr[i];

      /* load data structures into ether1 RAM */
      ether1_writebuffer (dev, &init_scp,  SCP_ADDR,  SCP_SIZE);
      ether1_writebuffer (dev, &init_iscp, ISCP_ADDR, ISCP_SIZE);
      ether1_writebuffer (dev, &init_scb,  SCB_ADDR,  SCB_SIZE);
      ether1_writebuffer (dev, &init_cfg,  CFG_ADDR,  CFG_SIZE);
      ether1_writebuffer (dev, &init_sa,   SA_ADDR,   SA_SIZE);
      ether1_writebuffer (dev, &init_mc,   MC_ADDR,   MC_SIZE);
      ether1_writebuffer (dev, &init_tdr,  TDR_ADDR,  TDR_SIZE);
      ether1_writebuffer (dev, &init_nop,  NOP_ADDR,  NOP_SIZE);

      if (ether1_readw(dev, CFG_ADDR, cfg_t, cfg_command, NORMALIRQS) != CMD_CONFIG) {
            printk (KERN_ERR "%s: detected either RAM fault or compiler bug\n",
                  dev->name);
            return 1;
      }

      /*
       * setup circularly linked list of { rfd, rbd, buffer }, with
       * all rfds circularly linked, rbds circularly linked.
       * First rfd is linked to scp, first rbd is linked to first
       * rfd.  Last rbd has a suspend command.
       */
      addr = RX_AREA_START;
      do {
            next = addr + RFD_SIZE + RBD_SIZE + ETH_FRAME_LEN + 10;
            next2 = next + RFD_SIZE + RBD_SIZE + ETH_FRAME_LEN + 10;

            if (next2 >= RX_AREA_END) {
                  next = RX_AREA_START;
                  init_rfd.rfd_command = RFD_CMDEL | RFD_CMDSUSPEND;
                  priv(dev)->rx_tail = addr;
            } else
                  init_rfd.rfd_command = 0;
            if (addr == RX_AREA_START)
                  init_rfd.rfd_rbdoffset = addr + RFD_SIZE;
            else
                  init_rfd.rfd_rbdoffset = 0;
            init_rfd.rfd_link = next;
            init_rbd.rbd_link = next + RFD_SIZE;
            init_rbd.rbd_bufl = addr + RFD_SIZE + RBD_SIZE;

            ether1_writebuffer (dev, &init_rfd, addr, RFD_SIZE);
            ether1_writebuffer (dev, &init_rbd, addr + RFD_SIZE, RBD_SIZE);
            addr = next;
      } while (next2 < RX_AREA_END);

      priv(dev)->tx_link = NOP_ADDR;
      priv(dev)->tx_head = NOP_ADDR + NOP_SIZE;
      priv(dev)->tx_tail = TDR_ADDR;
      priv(dev)->rx_head = RX_AREA_START;

      /* release reset & give 586 a prod */
      priv(dev)->resetting = 1;
      priv(dev)->initialising = 1;
      writeb(CTRL_RST, REG_CONTROL);
      writeb(0, REG_CONTROL);
      writeb(CTRL_CA, REG_CONTROL);

      /* 586 should now unset iscp.busy */
      timeout = jiffies + HZ/2;
      while (ether1_readw(dev, ISCP_ADDR, iscp_t, iscp_busy, DISABLEIRQS) == 1) {
            if (time_after(jiffies, timeout)) {
                  printk (KERN_WARNING "%s: can't initialise 82586: iscp is busy\n", dev->name);
                  return 1;
            }
      }

      /* check status of commands that we issued */
      timeout += HZ/10;
      while (((status = ether1_readw(dev, CFG_ADDR, cfg_t, cfg_status, DISABLEIRQS))
                  & STAT_COMPLETE) == 0) {
            if (time_after(jiffies, timeout))
                  break;
      }

      if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
            printk (KERN_WARNING "%s: can't initialise 82586: config status %04X\n", dev->name, status);
            printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
                  ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
                  ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
                  ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
                  ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
            failures += 1;
      }

      timeout += HZ/10;
      while (((status = ether1_readw(dev, SA_ADDR, sa_t, sa_status, DISABLEIRQS))
                  & STAT_COMPLETE) == 0) {
            if (time_after(jiffies, timeout))
                  break;
      }

      if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
            printk (KERN_WARNING "%s: can't initialise 82586: set address status %04X\n", dev->name, status);
            printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
                  ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
                  ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
                  ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
                  ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
            failures += 1;
      }

      timeout += HZ/10;
      while (((status = ether1_readw(dev, MC_ADDR, mc_t, mc_status, DISABLEIRQS))
                  & STAT_COMPLETE) == 0) {
            if (time_after(jiffies, timeout))
                  break;
      }

      if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
            printk (KERN_WARNING "%s: can't initialise 82586: set multicast status %04X\n", dev->name, status);
            printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
                  ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
                  ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
                  ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
                  ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
            failures += 1;
      }

      timeout += HZ;
      while (((status = ether1_readw(dev, TDR_ADDR, tdr_t, tdr_status, DISABLEIRQS))
                  & STAT_COMPLETE) == 0) {
            if (time_after(jiffies, timeout))
                  break;
      }

      if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
            printk (KERN_WARNING "%s: can't tdr (ignored)\n", dev->name);
            printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
                  ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
                  ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
                  ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
                  ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
      } else {
            status = ether1_readw(dev, TDR_ADDR, tdr_t, tdr_result, DISABLEIRQS);
            if (status & TDR_XCVRPROB)
                  printk (KERN_WARNING "%s: i/f failed tdr: transceiver problem\n", dev->name);
            else if ((status & (TDR_SHORT|TDR_OPEN)) && (status & TDR_TIME)) {
#ifdef FANCY
                  printk (KERN_WARNING "%s: i/f failed tdr: cable %s %d.%d us away\n", dev->name,
                        status & TDR_SHORT ? "short" : "open", (status & TDR_TIME) / 10,
                        (status & TDR_TIME) % 10);
#else
                  printk (KERN_WARNING "%s: i/f failed tdr: cable %s %d clks away\n", dev->name,
                        status & TDR_SHORT ? "short" : "open", (status & TDR_TIME));
#endif
            }
      }

      if (failures)
            ether1_reset (dev);
      return failures ? 1 : 0;
}

/* ------------------------------------------------------------------------- */

static int
ether1_txalloc (struct net_device *dev, int size)
{
      int start, tail;

      size = (size + 1) & ~1;
      tail = priv(dev)->tx_tail;

      if (priv(dev)->tx_head + size > TX_AREA_END) {
            if (tail > priv(dev)->tx_head)
                  return -1;
            start = TX_AREA_START;
            if (start + size > tail)
                  return -1;
            priv(dev)->tx_head = start + size;
      } else {
            if (priv(dev)->tx_head < tail && (priv(dev)->tx_head + size) > tail)
                  return -1;
            start = priv(dev)->tx_head;
            priv(dev)->tx_head += size;
      }

      return start;
}

static int
ether1_open (struct net_device *dev)
{
      if (!is_valid_ether_addr(dev->dev_addr)) {
            printk(KERN_WARNING "%s: invalid ethernet MAC address\n",
                  dev->name);
            return -EINVAL;
      }

      if (request_irq(dev->irq, ether1_interrupt, 0, "ether1", dev))
            return -EAGAIN;

      memset (&priv(dev)->stats, 0, sizeof (struct net_device_stats));

      if (ether1_init_for_open (dev)) {
            free_irq (dev->irq, dev);
            return -EAGAIN;
      }

      netif_start_queue(dev);

      return 0;
}

static void
ether1_timeout(struct net_device *dev)
{
      printk(KERN_WARNING "%s: transmit timeout, network cable problem?\n",
            dev->name);
      printk(KERN_WARNING "%s: resetting device\n", dev->name);

      ether1_reset (dev);

      if (ether1_init_for_open (dev))
            printk (KERN_ERR "%s: unable to restart interface\n", dev->name);

      priv(dev)->stats.tx_errors++;
      netif_wake_queue(dev);
}

static int
ether1_sendpacket (struct sk_buff *skb, struct net_device *dev)
{
      int tmp, tst, nopaddr, txaddr, tbdaddr, dataddr;
      unsigned long flags;
      tx_t tx;
      tbd_t tbd;
      nop_t nop;

      if (priv(dev)->restart) {
            printk(KERN_WARNING "%s: resetting device\n", dev->name);

            ether1_reset(dev);

            if (ether1_init_for_open(dev))
                  printk(KERN_ERR "%s: unable to restart interface\n", dev->name);
            else
                  priv(dev)->restart = 0;
      }

      if (skb->len < ETH_ZLEN) {
            if (skb_padto(skb, ETH_ZLEN))
                  goto out;
      }

      /*
       * insert packet followed by a nop
       */
      txaddr = ether1_txalloc (dev, TX_SIZE);
      tbdaddr = ether1_txalloc (dev, TBD_SIZE);
      dataddr = ether1_txalloc (dev, skb->len);
      nopaddr = ether1_txalloc (dev, NOP_SIZE);

      tx.tx_status = 0;
      tx.tx_command = CMD_TX | CMD_INTR;
      tx.tx_link = nopaddr;
      tx.tx_tbdoffset = tbdaddr;
      tbd.tbd_opts = TBD_EOL | skb->len;
      tbd.tbd_link = I82586_NULL;
      tbd.tbd_bufl = dataddr;
      tbd.tbd_bufh = 0;
      nop.nop_status = 0;
      nop.nop_command = CMD_NOP;
      nop.nop_link = nopaddr;

      local_irq_save(flags);
      ether1_writebuffer (dev, &tx, txaddr, TX_SIZE);
      ether1_writebuffer (dev, &tbd, tbdaddr, TBD_SIZE);
      ether1_writebuffer (dev, skb->data, dataddr, skb->len);
      ether1_writebuffer (dev, &nop, nopaddr, NOP_SIZE);
      tmp = priv(dev)->tx_link;
      priv(dev)->tx_link = nopaddr;

      /* now reset the previous nop pointer */
      ether1_writew(dev, txaddr, tmp, nop_t, nop_link, NORMALIRQS);

      local_irq_restore(flags);

      /* handle transmit */
      dev->trans_start = jiffies;

      /* check to see if we have room for a full sized ether frame */
      tmp = priv(dev)->tx_head;
      tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
      priv(dev)->tx_head = tmp;
      dev_kfree_skb (skb);

      if (tst == -1)
            netif_stop_queue(dev);

 out:
      return 0;
}

static void
ether1_xmit_done (struct net_device *dev)
{
      nop_t nop;
      int caddr, tst;

      caddr = priv(dev)->tx_tail;

again:
      ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);

      switch (nop.nop_command & CMD_MASK) {
      case CMD_TDR:
            /* special case */
            if (ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS)
                        != (unsigned short)I82586_NULL) {
                  ether1_writew(dev, SCB_CMDCUCSTART | SCB_CMDRXSTART, SCB_ADDR, scb_t,
                            scb_command, NORMALIRQS);
                  writeb(CTRL_CA, REG_CONTROL);
            }
            priv(dev)->tx_tail = NOP_ADDR;
            return;

      case CMD_NOP:
            if (nop.nop_link == caddr) {
                  if (priv(dev)->initialising == 0)
                        printk (KERN_WARNING "%s: strange command complete with no tx command!\n", dev->name);
                  else
                          priv(dev)->initialising = 0;
                  return;
            }
            if (caddr == nop.nop_link)
                  return;
            caddr = nop.nop_link;
            goto again;

      case CMD_TX:
            if (nop.nop_status & STAT_COMPLETE)
                  break;
            printk (KERN_ERR "%s: strange command complete without completed command\n", dev->name);
            priv(dev)->restart = 1;
            return;

      default:
            printk (KERN_WARNING "%s: strange command %d complete! (offset %04X)", dev->name,
                  nop.nop_command & CMD_MASK, caddr);
            priv(dev)->restart = 1;
            return;
      }

      while (nop.nop_status & STAT_COMPLETE) {
            if (nop.nop_status & STAT_OK) {
                  priv(dev)->stats.tx_packets ++;
                  priv(dev)->stats.collisions += (nop.nop_status & STAT_COLLISIONS);
            } else {
                  priv(dev)->stats.tx_errors ++;

                  if (nop.nop_status & STAT_COLLAFTERTX)
                        priv(dev)->stats.collisions ++;
                  if (nop.nop_status & STAT_NOCARRIER)
                        priv(dev)->stats.tx_carrier_errors ++;
                  if (nop.nop_status & STAT_TXLOSTCTS)
                        printk (KERN_WARNING "%s: cts lost\n", dev->name);
                  if (nop.nop_status & STAT_TXSLOWDMA)
                        priv(dev)->stats.tx_fifo_errors ++;
                  if (nop.nop_status & STAT_COLLEXCESSIVE)
                        priv(dev)->stats.collisions += 16;
            }

            if (nop.nop_link == caddr) {
                  printk (KERN_ERR "%s: tx buffer chaining error: tx command points to itself\n", dev->name);
                  break;
            }

            caddr = nop.nop_link;
            ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
            if ((nop.nop_command & CMD_MASK) != CMD_NOP) {
                  printk (KERN_ERR "%s: tx buffer chaining error: no nop after tx command\n", dev->name);
                  break;
            }

            if (caddr == nop.nop_link)
                  break;

            caddr = nop.nop_link;
            ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
            if ((nop.nop_command & CMD_MASK) != CMD_TX) {
                  printk (KERN_ERR "%s: tx buffer chaining error: no tx command after nop\n", dev->name);
                  break;
            }
      }
      priv(dev)->tx_tail = caddr;

      caddr = priv(dev)->tx_head;
      tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
      priv(dev)->tx_head = caddr;
      if (tst != -1)
            netif_wake_queue(dev);
}

static void
ether1_recv_done (struct net_device *dev)
{
      int status;
      int nexttail, rbdaddr;
      rbd_t rbd;

      do {
            status = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_status, NORMALIRQS);
            if ((status & RFD_COMPLETE) == 0)
                  break;

            rbdaddr = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_rbdoffset, NORMALIRQS);
            ether1_readbuffer (dev, &rbd, rbdaddr, RBD_SIZE);

            if ((rbd.rbd_status & (RBD_EOF | RBD_ACNTVALID)) == (RBD_EOF | RBD_ACNTVALID)) {
                  int length = rbd.rbd_status & RBD_ACNT;
                  struct sk_buff *skb;

                  length = (length + 1) & ~1;
                  skb = dev_alloc_skb (length + 2);

                  if (skb) {
                        skb_reserve (skb, 2);

                        ether1_readbuffer (dev, skb_put (skb, length), rbd.rbd_bufl, length);

                        skb->protocol = eth_type_trans (skb, dev);
                        netif_rx (skb);
                        priv(dev)->stats.rx_packets ++;
                  } else
                        priv(dev)->stats.rx_dropped ++;
            } else {
                  printk(KERN_WARNING "%s: %s\n", dev->name,
                        (rbd.rbd_status & RBD_EOF) ? "oversized packet" : "acnt not valid");
                  priv(dev)->stats.rx_dropped ++;
            }

            nexttail = ether1_readw(dev, priv(dev)->rx_tail, rfd_t, rfd_link, NORMALIRQS);
            /* nexttail should be rx_head */
            if (nexttail != priv(dev)->rx_head)
                  printk(KERN_ERR "%s: receiver buffer chaining error (%04X != %04X)\n",
                        dev->name, nexttail, priv(dev)->rx_head);
            ether1_writew(dev, RFD_CMDEL | RFD_CMDSUSPEND, nexttail, rfd_t, rfd_command, NORMALIRQS);
            ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_command, NORMALIRQS);
            ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_status, NORMALIRQS);
            ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_rbdoffset, NORMALIRQS);
      
            priv(dev)->rx_tail = nexttail;
            priv(dev)->rx_head = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_link, NORMALIRQS);
      } while (1);
}

static irqreturn_t
ether1_interrupt (int irq, void *dev_id)
{
      struct net_device *dev = (struct net_device *)dev_id;
      int status;

      status = ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS);

      if (status) {
            ether1_writew(dev, status & (SCB_STRNR | SCB_STCNA | SCB_STFR | SCB_STCX),
                      SCB_ADDR, scb_t, scb_command, NORMALIRQS);
            writeb(CTRL_CA | CTRL_ACK, REG_CONTROL);
            if (status & SCB_STCX) {
                  ether1_xmit_done (dev);
            }
            if (status & SCB_STCNA) {
                  if (priv(dev)->resetting == 0)
                        printk (KERN_WARNING "%s: CU went not ready ???\n", dev->name);
                  else
                        priv(dev)->resetting += 1;
                  if (ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS)
                              != (unsigned short)I82586_NULL) {
                        ether1_writew(dev, SCB_CMDCUCSTART, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
                        writeb(CTRL_CA, REG_CONTROL);
                  }
                  if (priv(dev)->resetting == 2)
                        priv(dev)->resetting = 0;
            }
            if (status & SCB_STFR) {
                  ether1_recv_done (dev);
            }
            if (status & SCB_STRNR) {
                  if (ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS) & SCB_STRXSUSP) {
                        printk (KERN_WARNING "%s: RU went not ready: RU suspended\n", dev->name);
                        ether1_writew(dev, SCB_CMDRXRESUME, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
                        writeb(CTRL_CA, REG_CONTROL);
                        priv(dev)->stats.rx_dropped ++;     /* we suspended due to lack of buffer space */
                  } else
                        printk(KERN_WARNING "%s: RU went not ready: %04X\n", dev->name,
                              ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS));
                  printk (KERN_WARNING "RU ptr = %04X\n", ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset,
                                    NORMALIRQS));
            }
      } else
            writeb(CTRL_ACK, REG_CONTROL);

      return IRQ_HANDLED;
}

static int
ether1_close (struct net_device *dev)
{
      ether1_reset (dev);

      free_irq(dev->irq, dev);

      return 0;
}

static struct net_device_stats *
ether1_getstats (struct net_device *dev)
{
      return &priv(dev)->stats;
}

/*
 * Set or clear the multicast filter for this adaptor.
 * num_addrs == -1      Promiscuous mode, receive all packets.
 * num_addrs == 0 Normal mode, clear multicast list.
 * num_addrs > 0  Multicast mode, receive normal and MC packets, and do
 *                best-effort filtering.
 */
static void
ether1_setmulticastlist (struct net_device *dev)
{
}

/* ------------------------------------------------------------------------- */

static void __devinit ether1_banner(void)
{
      static unsigned int version_printed = 0;

      if (net_debug && version_printed++ == 0)
            printk(KERN_INFO "%s", version);
}

static int __devinit
ether1_probe(struct expansion_card *ec, const struct ecard_id *id)
{
      struct net_device *dev;
      int i, ret = 0;
      DECLARE_MAC_BUF(mac);

      ether1_banner();

      ret = ecard_request_resources(ec);
      if (ret)
            goto out;

      dev = alloc_etherdev(sizeof(struct ether1_priv));
      if (!dev) {
            ret = -ENOMEM;
            goto release;
      }

      SET_NETDEV_DEV(dev, &ec->dev);

      dev->irq = ec->irq;
      priv(dev)->base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
      if (!priv(dev)->base) {
            ret = -ENOMEM;
            goto free;
      }

      if ((priv(dev)->bus_type = ether1_reset(dev)) == 0) {
            ret = -ENODEV;
            goto free;
      }

      for (i = 0; i < 6; i++)
            dev->dev_addr[i] = readb(IDPROM_ADDRESS + (i << 2));

      if (ether1_init_2(dev)) {
            ret = -ENODEV;
            goto free;
      }

      dev->open         = ether1_open;
      dev->stop         = ether1_close;
      dev->hard_start_xmit    = ether1_sendpacket;
      dev->get_stats          = ether1_getstats;
      dev->set_multicast_list = ether1_setmulticastlist;
      dev->tx_timeout         = ether1_timeout;
      dev->watchdog_timeo     = 5 * HZ / 100;

      ret = register_netdev(dev);
      if (ret)
            goto free;

      printk(KERN_INFO "%s: ether1 in slot %d, %s\n",
            dev->name, ec->slot_no, print_mac(mac, dev->dev_addr));
    
      ecard_set_drvdata(ec, dev);
      return 0;

 free:
      free_netdev(dev);
 release:
      ecard_release_resources(ec);
 out:
      return ret;
}

static void __devexit ether1_remove(struct expansion_card *ec)
{
      struct net_device *dev = ecard_get_drvdata(ec);

      ecard_set_drvdata(ec, NULL);  

      unregister_netdev(dev);
      free_netdev(dev);
      ecard_release_resources(ec);
}

static const struct ecard_id ether1_ids[] = {
      { MANU_ACORN, PROD_ACORN_ETHER1 },
      { 0xffff, 0xffff }
};

static struct ecard_driver ether1_driver = {
      .probe            = ether1_probe,
      .remove           = __devexit_p(ether1_remove),
      .id_table   = ether1_ids,
      .drv = {
            .name = "ether1",
      },
};

static int __init ether1_init(void)
{
      return ecard_register_driver(&ether1_driver);
}

static void __exit ether1_exit(void)
{
      ecard_remove_driver(&ether1_driver);
}

module_init(ether1_init);
module_exit(ether1_exit);

MODULE_LICENSE("GPL");

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