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nicstar.c

/******************************************************************************
 *
 * nicstar.c
 *
 * Device driver supporting CBR for IDT 77201/77211 "NICStAR" based cards.
 *
 * IMPORTANT: The included file nicstarmac.c was NOT WRITTEN BY ME.
 *            It was taken from the frle-0.22 device driver.
 *            As the file doesn't have a copyright notice, in the file
 *            nicstarmac.copyright I put the copyright notice from the
 *            frle-0.22 device driver.
 *            Some code is based on the nicstar driver by M. Welsh.
 *
 * Author: Rui Prior (rprior@inescn.pt)
 * PowerPC support by Jay Talbott (jay_talbott@mcg.mot.com) April 1999
 *
 *
 * (C) INESC 1999
 *
 *
 ******************************************************************************/


/**** IMPORTANT INFORMATION ***************************************************
 *
 * There are currently three types of spinlocks:
 *
 * 1 - Per card interrupt spinlock (to protect structures and such)
 * 2 - Per SCQ scq spinlock
 * 3 - Per card resource spinlock (to access registers, etc.)
 *
 * These must NEVER be grabbed in reverse order.
 *
 ******************************************************************************/

/* Header files ***************************************************************/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/atmdev.h>
#include <linux/atm.h>
#include <linux/pci.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/atomic.h>
#include "nicstar.h"
#ifdef CONFIG_ATM_NICSTAR_USE_SUNI
#include "suni.h"
#endif /* CONFIG_ATM_NICSTAR_USE_SUNI */
#ifdef CONFIG_ATM_NICSTAR_USE_IDT77105
#include "idt77105.h"
#endif /* CONFIG_ATM_NICSTAR_USE_IDT77105 */

#if BITS_PER_LONG != 32
#  error FIXME: this driver requires a 32-bit platform
#endif

/* Additional code ************************************************************/

#include "nicstarmac.c"


/* Configurable parameters ****************************************************/

#undef PHY_LOOPBACK
#undef TX_DEBUG
#undef RX_DEBUG
#undef GENERAL_DEBUG
#undef EXTRA_DEBUG

#undef NS_USE_DESTRUCTORS /* For now keep this undefined unless you know
                             you're going to use only raw ATM */


/* Do not touch these *********************************************************/

#ifdef TX_DEBUG
#define TXPRINTK(args...) printk(args)
#else
#define TXPRINTK(args...)
#endif /* TX_DEBUG */

#ifdef RX_DEBUG
#define RXPRINTK(args...) printk(args)
#else
#define RXPRINTK(args...)
#endif /* RX_DEBUG */

#ifdef GENERAL_DEBUG
#define PRINTK(args...) printk(args)
#else
#define PRINTK(args...)
#endif /* GENERAL_DEBUG */

#ifdef EXTRA_DEBUG
#define XPRINTK(args...) printk(args)
#else
#define XPRINTK(args...)
#endif /* EXTRA_DEBUG */


/* Macros *********************************************************************/

#define CMD_BUSY(card) (readl((card)->membase + STAT) & NS_STAT_CMDBZ)

#define NS_DELAY mdelay(1)

#define ALIGN_BUS_ADDR(addr, alignment) \
        ((((u32) (addr)) + (((u32) (alignment)) - 1)) & ~(((u32) (alignment)) - 1))
#define ALIGN_ADDRESS(addr, alignment) \
        bus_to_virt(ALIGN_BUS_ADDR(virt_to_bus(addr), alignment))

#undef CEIL

#ifndef ATM_SKB
#define ATM_SKB(s) (&(s)->atm)
#endif

   /* Spinlock debugging stuff */
#ifdef NS_DEBUG_SPINLOCKS /* See nicstar.h */
#define ns_grab_int_lock(card,flags) \
 do { \
    unsigned long nsdsf, nsdsf2; \
    local_irq_save(flags); \
    save_flags(nsdsf); cli();\
    if (nsdsf & (1<<9)) printk ("nicstar.c: ints %sabled -> enabled.\n", \
                                (flags)&(1<<9)?"en":"dis"); \
    if (spin_is_locked(&(card)->int_lock) && \
        (card)->cpu_int == smp_processor_id()) { \
       printk("nicstar.c: line %d (cpu %d) int_lock already locked at line %d (cpu %d)\n", \
              __LINE__, smp_processor_id(), (card)->has_int_lock, \
              (card)->cpu_int); \
       printk("nicstar.c: ints were %sabled.\n", ((flags)&(1<<9)?"en":"dis")); \
    } \
    if (spin_is_locked(&(card)->res_lock) && \
        (card)->cpu_res == smp_processor_id()) { \
       printk("nicstar.c: line %d (cpu %d) res_lock locked at line %d (cpu %d)(trying int)\n", \
              __LINE__, smp_processor_id(), (card)->has_res_lock, \
              (card)->cpu_res); \
       printk("nicstar.c: ints were %sabled.\n", ((flags)&(1<<9)?"en":"dis")); \
    } \
    spin_lock_irq(&(card)->int_lock); \
    (card)->has_int_lock = __LINE__; \
    (card)->cpu_int = smp_processor_id(); \
    restore_flags(nsdsf); } while (0)
#define ns_grab_res_lock(card,flags) \
 do { \
    unsigned long nsdsf, nsdsf2; \
    local_irq_save(flags); \
    save_flags(nsdsf); cli();\
    if (nsdsf & (1<<9)) printk ("nicstar.c: ints %sabled -> enabled.\n", \
                                (flags)&(1<<9)?"en":"dis"); \
    if (spin_is_locked(&(card)->res_lock) && \
        (card)->cpu_res == smp_processor_id()) { \
       printk("nicstar.c: line %d (cpu %d) res_lock already locked at line %d (cpu %d)\n", \
              __LINE__, smp_processor_id(), (card)->has_res_lock, \
              (card)->cpu_res); \
       printk("nicstar.c: ints were %sabled.\n", ((flags)&(1<<9)?"en":"dis")); \
    } \
    spin_lock_irq(&(card)->res_lock); \
    (card)->has_res_lock = __LINE__; \
    (card)->cpu_res = smp_processor_id(); \
    restore_flags(nsdsf); } while (0)
#define ns_grab_scq_lock(card,scq,flags) \
 do { \
    unsigned long nsdsf, nsdsf2; \
    local_irq_save(flags); \
    save_flags(nsdsf); cli();\
    if (nsdsf & (1<<9)) printk ("nicstar.c: ints %sabled -> enabled.\n", \
                                (flags)&(1<<9)?"en":"dis"); \
    if (spin_is_locked(&(scq)->lock) && \
        (scq)->cpu_lock == smp_processor_id()) { \
       printk("nicstar.c: line %d (cpu %d) this scq_lock already locked at line %d (cpu %d)\n", \
              __LINE__, smp_processor_id(), (scq)->has_lock, \
              (scq)->cpu_lock); \
       printk("nicstar.c: ints were %sabled.\n", ((flags)&(1<<9)?"en":"dis")); \
    } \
    if (spin_is_locked(&(card)->res_lock) && \
        (card)->cpu_res == smp_processor_id()) { \
       printk("nicstar.c: line %d (cpu %d) res_lock locked at line %d (cpu %d)(trying scq)\n", \
              __LINE__, smp_processor_id(), (card)->has_res_lock, \
              (card)->cpu_res); \
       printk("nicstar.c: ints were %sabled.\n", ((flags)&(1<<9)?"en":"dis")); \
    } \
    spin_lock_irq(&(scq)->lock); \
    (scq)->has_lock = __LINE__; \
    (scq)->cpu_lock = smp_processor_id(); \
    restore_flags(nsdsf); } while (0)
#else /* !NS_DEBUG_SPINLOCKS */
#define ns_grab_int_lock(card,flags) \
        spin_lock_irqsave(&(card)->int_lock,(flags))
#define ns_grab_res_lock(card,flags) \
        spin_lock_irqsave(&(card)->res_lock,(flags))
#define ns_grab_scq_lock(card,scq,flags) \
        spin_lock_irqsave(&(scq)->lock,flags)
#endif /* NS_DEBUG_SPINLOCKS */


/* Function declarations ******************************************************/

static u32 ns_read_sram(ns_dev *card, u32 sram_address);
static void ns_write_sram(ns_dev *card, u32 sram_address, u32 *value, int count);
static int __devinit ns_init_card(int i, struct pci_dev *pcidev);
static void __devinit ns_init_card_error(ns_dev *card, int error);
static scq_info *get_scq(int size, u32 scd);
static void free_scq(scq_info *scq, struct atm_vcc *vcc);
static void push_rxbufs(ns_dev *, struct sk_buff *);
static irqreturn_t ns_irq_handler(int irq, void *dev_id);
static int ns_open(struct atm_vcc *vcc);
static void ns_close(struct atm_vcc *vcc);
static void fill_tst(ns_dev *card, int n, vc_map *vc);
static int ns_send(struct atm_vcc *vcc, struct sk_buff *skb);
static int push_scqe(ns_dev *card, vc_map *vc, scq_info *scq, ns_scqe *tbd,
                     struct sk_buff *skb);
static void process_tsq(ns_dev *card);
static void drain_scq(ns_dev *card, scq_info *scq, int pos);
static void process_rsq(ns_dev *card);
static void dequeue_rx(ns_dev *card, ns_rsqe *rsqe);
#ifdef NS_USE_DESTRUCTORS
static void ns_sb_destructor(struct sk_buff *sb);
static void ns_lb_destructor(struct sk_buff *lb);
static void ns_hb_destructor(struct sk_buff *hb);
#endif /* NS_USE_DESTRUCTORS */
static void recycle_rx_buf(ns_dev *card, struct sk_buff *skb);
static void recycle_iovec_rx_bufs(ns_dev *card, struct iovec *iov, int count);
static void recycle_iov_buf(ns_dev *card, struct sk_buff *iovb);
static void dequeue_sm_buf(ns_dev *card, struct sk_buff *sb);
static void dequeue_lg_buf(ns_dev *card, struct sk_buff *lb);
static int ns_proc_read(struct atm_dev *dev, loff_t *pos, char *page);
static int ns_ioctl(struct atm_dev *dev, unsigned int cmd, void __user *arg);
static void which_list(ns_dev *card, struct sk_buff *skb);
static void ns_poll(unsigned long arg);
static int ns_parse_mac(char *mac, unsigned char *esi);
static short ns_h2i(char c);
static void ns_phy_put(struct atm_dev *dev, unsigned char value,
                       unsigned long addr);
static unsigned char ns_phy_get(struct atm_dev *dev, unsigned long addr);



/* Global variables ***********************************************************/

static struct ns_dev *cards[NS_MAX_CARDS];
static unsigned num_cards;
static struct atmdev_ops atm_ops =
{
   .open    = ns_open,
   .close   = ns_close,
   .ioctl   = ns_ioctl,
   .send    = ns_send,
   .phy_put = ns_phy_put,
   .phy_get = ns_phy_get,
   .proc_read     = ns_proc_read,
   .owner   = THIS_MODULE,
};
static struct timer_list ns_timer;
static char *mac[NS_MAX_CARDS];
module_param_array(mac, charp, NULL, 0);
MODULE_LICENSE("GPL");


/* Functions*******************************************************************/

static int __devinit nicstar_init_one(struct pci_dev *pcidev,
                              const struct pci_device_id *ent)
{
   static int index = -1;
   unsigned int error;

   index++;
   cards[index] = NULL;

   error = ns_init_card(index, pcidev);
   if (error) {
      cards[index--] = NULL;  /* don't increment index */
      goto err_out;
   }

   return 0;
err_out:
   return -ENODEV;
}



static void __devexit nicstar_remove_one(struct pci_dev *pcidev)
{
   int i, j;
   ns_dev *card = pci_get_drvdata(pcidev);
   struct sk_buff *hb;
   struct sk_buff *iovb;
   struct sk_buff *lb;
   struct sk_buff *sb;
   
   i = card->index;

   if (cards[i] == NULL)
      return;

   if (card->atmdev->phy && card->atmdev->phy->stop)
      card->atmdev->phy->stop(card->atmdev);

   /* Stop everything */
   writel(0x00000000, card->membase + CFG);

   /* De-register device */
   atm_dev_deregister(card->atmdev);

   /* Disable PCI device */
   pci_disable_device(pcidev);
   
   /* Free up resources */
   j = 0;
   PRINTK("nicstar%d: freeing %d huge buffers.\n", i, card->hbpool.count);
   while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL)
   {
      dev_kfree_skb_any(hb);
      j++;
   }
   PRINTK("nicstar%d: %d huge buffers freed.\n", i, j);
   j = 0;
   PRINTK("nicstar%d: freeing %d iovec buffers.\n", i, card->iovpool.count);
   while ((iovb = skb_dequeue(&card->iovpool.queue)) != NULL)
   {
      dev_kfree_skb_any(iovb);
      j++;
   }
   PRINTK("nicstar%d: %d iovec buffers freed.\n", i, j);
   while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
      dev_kfree_skb_any(lb);
   while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
      dev_kfree_skb_any(sb);
   free_scq(card->scq0, NULL);
   for (j = 0; j < NS_FRSCD_NUM; j++)
   {
      if (card->scd2vc[j] != NULL)
         free_scq(card->scd2vc[j]->scq, card->scd2vc[j]->tx_vcc);
   }
   kfree(card->rsq.org);
   kfree(card->tsq.org);
   free_irq(card->pcidev->irq, card);
   iounmap(card->membase);
   kfree(card);
}



static struct pci_device_id nicstar_pci_tbl[] __devinitdata =
{
      {PCI_VENDOR_ID_IDT, PCI_DEVICE_ID_IDT_IDT77201,
       PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
      {0,}              /* terminate list */
};
MODULE_DEVICE_TABLE(pci, nicstar_pci_tbl);



static struct pci_driver nicstar_driver = {
      .name       = "nicstar",
      .id_table   = nicstar_pci_tbl,
      .probe            = nicstar_init_one,
      .remove           = __devexit_p(nicstar_remove_one),
};



static int __init nicstar_init(void)
{
   unsigned error = 0;  /* Initialized to remove compile warning */

   XPRINTK("nicstar: nicstar_init() called.\n");

   error = pci_register_driver(&nicstar_driver);
   
   TXPRINTK("nicstar: TX debug enabled.\n");
   RXPRINTK("nicstar: RX debug enabled.\n");
   PRINTK("nicstar: General debug enabled.\n");
#ifdef PHY_LOOPBACK
   printk("nicstar: using PHY loopback.\n");
#endif /* PHY_LOOPBACK */
   XPRINTK("nicstar: nicstar_init() returned.\n");

   if (!error) {
      init_timer(&ns_timer);
      ns_timer.expires = jiffies + NS_POLL_PERIOD;
      ns_timer.data = 0UL;
      ns_timer.function = ns_poll;
      add_timer(&ns_timer);
   }
   
   return error;
}



static void __exit nicstar_cleanup(void)
{
   XPRINTK("nicstar: nicstar_cleanup() called.\n");

   del_timer(&ns_timer);

   pci_unregister_driver(&nicstar_driver);

   XPRINTK("nicstar: nicstar_cleanup() returned.\n");
}



static u32 ns_read_sram(ns_dev *card, u32 sram_address)
{
   unsigned long flags;
   u32 data;
   sram_address <<= 2;
   sram_address &= 0x0007FFFC;      /* address must be dword aligned */
   sram_address |= 0x50000000;      /* SRAM read command */
   ns_grab_res_lock(card, flags);
   while (CMD_BUSY(card));
   writel(sram_address, card->membase + CMD);
   while (CMD_BUSY(card));
   data = readl(card->membase + DR0);
   spin_unlock_irqrestore(&card->res_lock, flags);
   return data;
}


   
static void ns_write_sram(ns_dev *card, u32 sram_address, u32 *value, int count)
{
   unsigned long flags;
   int i, c;
   count--; /* count range now is 0..3 instead of 1..4 */
   c = count;
   c <<= 2; /* to use increments of 4 */
   ns_grab_res_lock(card, flags);
   while (CMD_BUSY(card));
   for (i = 0; i <= c; i += 4)
      writel(*(value++), card->membase + i);
   /* Note: DR# registers are the first 4 dwords in nicstar's memspace,
            so card->membase + DR0 == card->membase */
   sram_address <<= 2;
   sram_address &= 0x0007FFFC;
   sram_address |= (0x40000000 | count);
   writel(sram_address, card->membase + CMD);
   spin_unlock_irqrestore(&card->res_lock, flags);
}


static int __devinit ns_init_card(int i, struct pci_dev *pcidev)
{
   int j;
   struct ns_dev *card = NULL;
   unsigned char pci_latency;
   unsigned error;
   u32 data;
   u32 u32d[4];
   u32 ns_cfg_rctsize;
   int bcount;
   unsigned long membase;

   error = 0;

   if (pci_enable_device(pcidev))
   {
      printk("nicstar%d: can't enable PCI device\n", i);
      error = 2;
      ns_init_card_error(card, error);
      return error;
   }

   if ((card = kmalloc(sizeof(ns_dev), GFP_KERNEL)) == NULL)
   {
      printk("nicstar%d: can't allocate memory for device structure.\n", i);
      error = 2;
      ns_init_card_error(card, error);
      return error;
   }
   cards[i] = card;
   spin_lock_init(&card->int_lock);
   spin_lock_init(&card->res_lock);
      
   pci_set_drvdata(pcidev, card);
   
   card->index = i;
   card->atmdev = NULL;
   card->pcidev = pcidev;
   membase = pci_resource_start(pcidev, 1);
   card->membase = ioremap(membase, NS_IOREMAP_SIZE);
   if (card->membase == 0)
   {
      printk("nicstar%d: can't ioremap() membase.\n",i);
      error = 3;
      ns_init_card_error(card, error);
      return error;
   }
   PRINTK("nicstar%d: membase at 0x%x.\n", i, card->membase);

   pci_set_master(pcidev);

   if (pci_read_config_byte(pcidev, PCI_LATENCY_TIMER, &pci_latency) != 0)
   {
      printk("nicstar%d: can't read PCI latency timer.\n", i);
      error = 6;
      ns_init_card_error(card, error);
      return error;
   }
#ifdef NS_PCI_LATENCY
   if (pci_latency < NS_PCI_LATENCY)
   {
      PRINTK("nicstar%d: setting PCI latency timer to %d.\n", i, NS_PCI_LATENCY);
      for (j = 1; j < 4; j++)
      {
         if (pci_write_config_byte(pcidev, PCI_LATENCY_TIMER, NS_PCI_LATENCY) != 0)
          break;
      }
      if (j == 4)
      {
         printk("nicstar%d: can't set PCI latency timer to %d.\n", i, NS_PCI_LATENCY);
         error = 7;
         ns_init_card_error(card, error);
       return error;
      }
   }
#endif /* NS_PCI_LATENCY */
      
   /* Clear timer overflow */
   data = readl(card->membase + STAT);
   if (data & NS_STAT_TMROF)
      writel(NS_STAT_TMROF, card->membase + STAT);

   /* Software reset */
   writel(NS_CFG_SWRST, card->membase + CFG);
   NS_DELAY;
   writel(0x00000000, card->membase + CFG);

   /* PHY reset */
   writel(0x00000008, card->membase + GP);
   NS_DELAY;
   writel(0x00000001, card->membase + GP);
   NS_DELAY;
   while (CMD_BUSY(card));
   writel(NS_CMD_WRITE_UTILITY | 0x00000100, card->membase + CMD);      /* Sync UTOPIA with SAR clock */
   NS_DELAY;
      
   /* Detect PHY type */
   while (CMD_BUSY(card));
   writel(NS_CMD_READ_UTILITY | 0x00000200, card->membase + CMD);
   while (CMD_BUSY(card));
   data = readl(card->membase + DR0);
   switch(data) {
      case 0x00000009:
         printk("nicstar%d: PHY seems to be 25 Mbps.\n", i);
         card->max_pcr = ATM_25_PCR;
         while(CMD_BUSY(card));
         writel(0x00000008, card->membase + DR0);
         writel(NS_CMD_WRITE_UTILITY | 0x00000200, card->membase + CMD);
         /* Clear an eventual pending interrupt */
         writel(NS_STAT_SFBQF, card->membase + STAT);
#ifdef PHY_LOOPBACK
         while(CMD_BUSY(card));
         writel(0x00000022, card->membase + DR0);
         writel(NS_CMD_WRITE_UTILITY | 0x00000202, card->membase + CMD);
#endif /* PHY_LOOPBACK */
       break;
      case 0x00000030:
      case 0x00000031:
         printk("nicstar%d: PHY seems to be 155 Mbps.\n", i);
         card->max_pcr = ATM_OC3_PCR;
#ifdef PHY_LOOPBACK
         while(CMD_BUSY(card));
         writel(0x00000002, card->membase + DR0);
         writel(NS_CMD_WRITE_UTILITY | 0x00000205, card->membase + CMD);
#endif /* PHY_LOOPBACK */
       break;
      default:
         printk("nicstar%d: unknown PHY type (0x%08X).\n", i, data);
         error = 8;
         ns_init_card_error(card, error);
         return error;
   }
   writel(0x00000000, card->membase + GP);

   /* Determine SRAM size */
   data = 0x76543210;
   ns_write_sram(card, 0x1C003, &data, 1);
   data = 0x89ABCDEF;
   ns_write_sram(card, 0x14003, &data, 1);
   if (ns_read_sram(card, 0x14003) == 0x89ABCDEF &&
       ns_read_sram(card, 0x1C003) == 0x76543210)
       card->sram_size = 128;
   else
      card->sram_size = 32;
   PRINTK("nicstar%d: %dK x 32bit SRAM size.\n", i, card->sram_size);

   card->rct_size = NS_MAX_RCTSIZE;

#if (NS_MAX_RCTSIZE == 4096)
   if (card->sram_size == 128)
      printk("nicstar%d: limiting maximum VCI. See NS_MAX_RCTSIZE in nicstar.h\n", i);
#elif (NS_MAX_RCTSIZE == 16384)
   if (card->sram_size == 32)
   {
      printk("nicstar%d: wasting memory. See NS_MAX_RCTSIZE in nicstar.h\n", i);
      card->rct_size = 4096;
   }
#else
#error NS_MAX_RCTSIZE must be either 4096 or 16384 in nicstar.c
#endif

   card->vpibits = NS_VPIBITS;
   if (card->rct_size == 4096)
      card->vcibits = 12 - NS_VPIBITS;
   else /* card->rct_size == 16384 */
      card->vcibits = 14 - NS_VPIBITS;

   /* Initialize the nicstar eeprom/eprom stuff, for the MAC addr */
   if (mac[i] == NULL)
      nicstar_init_eprom(card->membase);

   /* Set the VPI/VCI MSb mask to zero so we can receive OAM cells */
   writel(0x00000000, card->membase + VPM);
      
   /* Initialize TSQ */
   card->tsq.org = kmalloc(NS_TSQSIZE + NS_TSQ_ALIGNMENT, GFP_KERNEL);
   if (card->tsq.org == NULL)
   {
      printk("nicstar%d: can't allocate TSQ.\n", i);
      error = 10;
      ns_init_card_error(card, error);
      return error;
   }
   card->tsq.base = (ns_tsi *) ALIGN_ADDRESS(card->tsq.org, NS_TSQ_ALIGNMENT);
   card->tsq.next = card->tsq.base;
   card->tsq.last = card->tsq.base + (NS_TSQ_NUM_ENTRIES - 1);
   for (j = 0; j < NS_TSQ_NUM_ENTRIES; j++)
      ns_tsi_init(card->tsq.base + j);
   writel(0x00000000, card->membase + TSQH);
   writel((u32) virt_to_bus(card->tsq.base), card->membase + TSQB);
   PRINTK("nicstar%d: TSQ base at 0x%x  0x%x  0x%x.\n", i, (u32) card->tsq.base,
          (u32) virt_to_bus(card->tsq.base), readl(card->membase + TSQB));
      
   /* Initialize RSQ */
   card->rsq.org = kmalloc(NS_RSQSIZE + NS_RSQ_ALIGNMENT, GFP_KERNEL);
   if (card->rsq.org == NULL)
   {
      printk("nicstar%d: can't allocate RSQ.\n", i);
      error = 11;
      ns_init_card_error(card, error);
      return error;
   }
   card->rsq.base = (ns_rsqe *) ALIGN_ADDRESS(card->rsq.org, NS_RSQ_ALIGNMENT);
   card->rsq.next = card->rsq.base;
   card->rsq.last = card->rsq.base + (NS_RSQ_NUM_ENTRIES - 1);
   for (j = 0; j < NS_RSQ_NUM_ENTRIES; j++)
      ns_rsqe_init(card->rsq.base + j);
   writel(0x00000000, card->membase + RSQH);
   writel((u32) virt_to_bus(card->rsq.base), card->membase + RSQB);
   PRINTK("nicstar%d: RSQ base at 0x%x.\n", i, (u32) card->rsq.base);
      
   /* Initialize SCQ0, the only VBR SCQ used */
   card->scq1 = NULL;
   card->scq2 = NULL;
   card->scq0 = get_scq(VBR_SCQSIZE, NS_VRSCD0);
   if (card->scq0 == NULL)
   {
      printk("nicstar%d: can't get SCQ0.\n", i);
      error = 12;
      ns_init_card_error(card, error);
      return error;
   }
   u32d[0] = (u32) virt_to_bus(card->scq0->base);
   u32d[1] = (u32) 0x00000000;
   u32d[2] = (u32) 0xffffffff;
   u32d[3] = (u32) 0x00000000;
   ns_write_sram(card, NS_VRSCD0, u32d, 4);
   ns_write_sram(card, NS_VRSCD1, u32d, 4);     /* These last two won't be used */
   ns_write_sram(card, NS_VRSCD2, u32d, 4);     /* but are initialized, just in case... */
   card->scq0->scd = NS_VRSCD0;
   PRINTK("nicstar%d: VBR-SCQ0 base at 0x%x.\n", i, (u32) card->scq0->base);

   /* Initialize TSTs */
   card->tst_addr = NS_TST0;
   card->tst_free_entries = NS_TST_NUM_ENTRIES;
   data = NS_TST_OPCODE_VARIABLE;
   for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
      ns_write_sram(card, NS_TST0 + j, &data, 1);
   data = ns_tste_make(NS_TST_OPCODE_END, NS_TST0);
   ns_write_sram(card, NS_TST0 + NS_TST_NUM_ENTRIES, &data, 1);
   for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
      ns_write_sram(card, NS_TST1 + j, &data, 1);
   data = ns_tste_make(NS_TST_OPCODE_END, NS_TST1);
   ns_write_sram(card, NS_TST1 + NS_TST_NUM_ENTRIES, &data, 1);
   for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
      card->tste2vc[j] = NULL;
   writel(NS_TST0 << 2, card->membase + TSTB);


   /* Initialize RCT. AAL type is set on opening the VC. */
#ifdef RCQ_SUPPORT
   u32d[0] = NS_RCTE_RAWCELLINTEN;
#else
   u32d[0] = 0x00000000;
#endif /* RCQ_SUPPORT */
   u32d[1] = 0x00000000;
   u32d[2] = 0x00000000;
   u32d[3] = 0xFFFFFFFF;
   for (j = 0; j < card->rct_size; j++)
      ns_write_sram(card, j * 4, u32d, 4);      
      
   memset(card->vcmap, 0, NS_MAX_RCTSIZE * sizeof(vc_map));
      
   for (j = 0; j < NS_FRSCD_NUM; j++)
      card->scd2vc[j] = NULL;

   /* Initialize buffer levels */
   card->sbnr.min = MIN_SB;
   card->sbnr.init = NUM_SB;
   card->sbnr.max = MAX_SB;
   card->lbnr.min = MIN_LB;
   card->lbnr.init = NUM_LB;
   card->lbnr.max = MAX_LB;
   card->iovnr.min = MIN_IOVB;
   card->iovnr.init = NUM_IOVB;
   card->iovnr.max = MAX_IOVB;
   card->hbnr.min = MIN_HB;
   card->hbnr.init = NUM_HB;
   card->hbnr.max = MAX_HB;
   
   card->sm_handle = 0x00000000;
   card->sm_addr = 0x00000000;
   card->lg_handle = 0x00000000;
   card->lg_addr = 0x00000000;
   
   card->efbie = 1;     /* To prevent push_rxbufs from enabling the interrupt */

   /* Pre-allocate some huge buffers */
   skb_queue_head_init(&card->hbpool.queue);
   card->hbpool.count = 0;
   for (j = 0; j < NUM_HB; j++)
   {
      struct sk_buff *hb;
      hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
      if (hb == NULL)
      {
         printk("nicstar%d: can't allocate %dth of %d huge buffers.\n",
                i, j, NUM_HB);
         error = 13;
         ns_init_card_error(card, error);
       return error;
      }
      NS_SKB_CB(hb)->buf_type = BUF_NONE;
      skb_queue_tail(&card->hbpool.queue, hb);
      card->hbpool.count++;
   }


   /* Allocate large buffers */
   skb_queue_head_init(&card->lbpool.queue);
   card->lbpool.count = 0;                /* Not used */
   for (j = 0; j < NUM_LB; j++)
   {
      struct sk_buff *lb;
      lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
      if (lb == NULL)
      {
         printk("nicstar%d: can't allocate %dth of %d large buffers.\n",
                i, j, NUM_LB);
         error = 14;
         ns_init_card_error(card, error);
       return error;
      }
      NS_SKB_CB(lb)->buf_type = BUF_LG;
      skb_queue_tail(&card->lbpool.queue, lb);
      skb_reserve(lb, NS_SMBUFSIZE);
      push_rxbufs(card, lb);
      /* Due to the implementation of push_rxbufs() this is 1, not 0 */
      if (j == 1)
      {
         card->rcbuf = lb;
         card->rawch = (u32) virt_to_bus(lb->data);
      }
   }
   /* Test for strange behaviour which leads to crashes */
   if ((bcount = ns_stat_lfbqc_get(readl(card->membase + STAT))) < card->lbnr.min)
   {
      printk("nicstar%d: Strange... Just allocated %d large buffers and lfbqc = %d.\n",
             i, j, bcount);
      error = 14;
      ns_init_card_error(card, error);
      return error;
   }
      

   /* Allocate small buffers */
   skb_queue_head_init(&card->sbpool.queue);
   card->sbpool.count = 0;                /* Not used */
   for (j = 0; j < NUM_SB; j++)
   {
      struct sk_buff *sb;
      sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
      if (sb == NULL)
      {
         printk("nicstar%d: can't allocate %dth of %d small buffers.\n",
                i, j, NUM_SB);
         error = 15;
         ns_init_card_error(card, error);
       return error;
      }
      NS_SKB_CB(sb)->buf_type = BUF_SM;
      skb_queue_tail(&card->sbpool.queue, sb);
      skb_reserve(sb, NS_AAL0_HEADER);
      push_rxbufs(card, sb);
   }
   /* Test for strange behaviour which leads to crashes */
   if ((bcount = ns_stat_sfbqc_get(readl(card->membase + STAT))) < card->sbnr.min)
   {
      printk("nicstar%d: Strange... Just allocated %d small buffers and sfbqc = %d.\n",
             i, j, bcount);
      error = 15;
      ns_init_card_error(card, error);
      return error;
   }
      

   /* Allocate iovec buffers */
   skb_queue_head_init(&card->iovpool.queue);
   card->iovpool.count = 0;
   for (j = 0; j < NUM_IOVB; j++)
   {
      struct sk_buff *iovb;
      iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
      if (iovb == NULL)
      {
         printk("nicstar%d: can't allocate %dth of %d iovec buffers.\n",
                i, j, NUM_IOVB);
         error = 16;
         ns_init_card_error(card, error);
       return error;
      }
      NS_SKB_CB(iovb)->buf_type = BUF_NONE;
      skb_queue_tail(&card->iovpool.queue, iovb);
      card->iovpool.count++;
   }

   /* Configure NICStAR */
   if (card->rct_size == 4096)
      ns_cfg_rctsize = NS_CFG_RCTSIZE_4096_ENTRIES;
   else /* (card->rct_size == 16384) */
      ns_cfg_rctsize = NS_CFG_RCTSIZE_16384_ENTRIES;

   card->efbie = 1;

   card->intcnt = 0;
   if (request_irq(pcidev->irq, &ns_irq_handler, IRQF_DISABLED | IRQF_SHARED, "nicstar", card) != 0)
   {
      printk("nicstar%d: can't allocate IRQ %d.\n", i, pcidev->irq);
      error = 9;
      ns_init_card_error(card, error);
      return error;
   }

   /* Register device */
   card->atmdev = atm_dev_register("nicstar", &atm_ops, -1, NULL);
   if (card->atmdev == NULL)
   {
      printk("nicstar%d: can't register device.\n", i);
      error = 17;
      ns_init_card_error(card, error);
      return error;
   }
      
   if (ns_parse_mac(mac[i], card->atmdev->esi)) {
      nicstar_read_eprom(card->membase, NICSTAR_EPROM_MAC_ADDR_OFFSET,
                         card->atmdev->esi, 6);
      if (memcmp(card->atmdev->esi, "\x00\x00\x00\x00\x00\x00", 6) == 0) {
         nicstar_read_eprom(card->membase, NICSTAR_EPROM_MAC_ADDR_OFFSET_ALT,
                         card->atmdev->esi, 6);
      }
   }

   printk("nicstar%d: MAC address %02X:%02X:%02X:%02X:%02X:%02X\n", i,
          card->atmdev->esi[0], card->atmdev->esi[1], card->atmdev->esi[2],
          card->atmdev->esi[3], card->atmdev->esi[4], card->atmdev->esi[5]);

   card->atmdev->dev_data = card;
   card->atmdev->ci_range.vpi_bits = card->vpibits;
   card->atmdev->ci_range.vci_bits = card->vcibits;
   card->atmdev->link_rate = card->max_pcr;
   card->atmdev->phy = NULL;

#ifdef CONFIG_ATM_NICSTAR_USE_SUNI
   if (card->max_pcr == ATM_OC3_PCR)
      suni_init(card->atmdev);
#endif /* CONFIG_ATM_NICSTAR_USE_SUNI */

#ifdef CONFIG_ATM_NICSTAR_USE_IDT77105
   if (card->max_pcr == ATM_25_PCR)
      idt77105_init(card->atmdev);
#endif /* CONFIG_ATM_NICSTAR_USE_IDT77105 */

   if (card->atmdev->phy && card->atmdev->phy->start)
      card->atmdev->phy->start(card->atmdev);

   writel(NS_CFG_RXPATH |
          NS_CFG_SMBUFSIZE |
          NS_CFG_LGBUFSIZE |
          NS_CFG_EFBIE |
          NS_CFG_RSQSIZE |
          NS_CFG_VPIBITS |
          ns_cfg_rctsize |
          NS_CFG_RXINT_NODELAY |
          NS_CFG_RAWIE |            /* Only enabled if RCQ_SUPPORT */
          NS_CFG_RSQAFIE |
          NS_CFG_TXEN |
          NS_CFG_TXIE |
          NS_CFG_TSQFIE_OPT |       /* Only enabled if ENABLE_TSQFIE */ 
          NS_CFG_PHYIE,
          card->membase + CFG);

   num_cards++;

   return error;
}



static void __devinit ns_init_card_error(ns_dev *card, int error)
{
   if (error >= 17)
   {
      writel(0x00000000, card->membase + CFG);
   }
   if (error >= 16)
   {
      struct sk_buff *iovb;
      while ((iovb = skb_dequeue(&card->iovpool.queue)) != NULL)
         dev_kfree_skb_any(iovb);
   }
   if (error >= 15)
   {
      struct sk_buff *sb;
      while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
         dev_kfree_skb_any(sb);
      free_scq(card->scq0, NULL);
   }
   if (error >= 14)
   {
      struct sk_buff *lb;
      while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
         dev_kfree_skb_any(lb);
   }
   if (error >= 13)
   {
      struct sk_buff *hb;
      while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL)
         dev_kfree_skb_any(hb);
   }
   if (error >= 12)
   {
      kfree(card->rsq.org);
   }
   if (error >= 11)
   {
      kfree(card->tsq.org);
   }
   if (error >= 10)
   {
      free_irq(card->pcidev->irq, card);
   }
   if (error >= 4)
   {
      iounmap(card->membase);
   }
   if (error >= 3)
   {
      pci_disable_device(card->pcidev);
      kfree(card);
   }
}



static scq_info *get_scq(int size, u32 scd)
{
   scq_info *scq;
   int i;

   if (size != VBR_SCQSIZE && size != CBR_SCQSIZE)
      return NULL;

   scq = kmalloc(sizeof(scq_info), GFP_KERNEL);
   if (scq == NULL)
      return NULL;
   scq->org = kmalloc(2 * size, GFP_KERNEL);
   if (scq->org == NULL)
   {
      kfree(scq);
      return NULL;
   }
   scq->skb = kmalloc(sizeof(struct sk_buff *) *
                                          (size / NS_SCQE_SIZE), GFP_KERNEL);
   if (scq->skb == NULL)
   {
      kfree(scq->org);
      kfree(scq);
      return NULL;
   }
   scq->num_entries = size / NS_SCQE_SIZE;
   scq->base = (ns_scqe *) ALIGN_ADDRESS(scq->org, size);
   scq->next = scq->base;
   scq->last = scq->base + (scq->num_entries - 1);
   scq->tail = scq->last;
   scq->scd = scd;
   scq->num_entries = size / NS_SCQE_SIZE;
   scq->tbd_count = 0;
   init_waitqueue_head(&scq->scqfull_waitq);
   scq->full = 0;
   spin_lock_init(&scq->lock);

   for (i = 0; i < scq->num_entries; i++)
      scq->skb[i] = NULL;

   return scq;
}



/* For variable rate SCQ vcc must be NULL */
static void free_scq(scq_info *scq, struct atm_vcc *vcc)
{
   int i;

   if (scq->num_entries == VBR_SCQ_NUM_ENTRIES)
      for (i = 0; i < scq->num_entries; i++)
      {
         if (scq->skb[i] != NULL)
       {
            vcc = ATM_SKB(scq->skb[i])->vcc;
            if (vcc->pop != NULL)
             vcc->pop(vcc, scq->skb[i]);
          else
               dev_kfree_skb_any(scq->skb[i]);
         }
      }
   else /* vcc must be != NULL */
   {
      if (vcc == NULL)
      {
         printk("nicstar: free_scq() called with vcc == NULL for fixed rate scq.");
         for (i = 0; i < scq->num_entries; i++)
            dev_kfree_skb_any(scq->skb[i]);
      }
      else
         for (i = 0; i < scq->num_entries; i++)
         {
            if (scq->skb[i] != NULL)
            {
               if (vcc->pop != NULL)
                  vcc->pop(vcc, scq->skb[i]);
               else
                  dev_kfree_skb_any(scq->skb[i]);
            }
         }
   }
   kfree(scq->skb);
   kfree(scq->org);
   kfree(scq);
}



/* The handles passed must be pointers to the sk_buff containing the small
   or large buffer(s) cast to u32. */
static void push_rxbufs(ns_dev *card, struct sk_buff *skb)
{
   struct ns_skb_cb *cb = NS_SKB_CB(skb);
   u32 handle1, addr1;
   u32 handle2, addr2;
   u32 stat;
   unsigned long flags;
   
   /* *BARF* */
   handle2 = addr2 = 0;
   handle1 = (u32)skb;
   addr1 = (u32)virt_to_bus(skb->data);

#ifdef GENERAL_DEBUG
   if (!addr1)
      printk("nicstar%d: push_rxbufs called with addr1 = 0.\n", card->index);
#endif /* GENERAL_DEBUG */

   stat = readl(card->membase + STAT);
   card->sbfqc = ns_stat_sfbqc_get(stat);
   card->lbfqc = ns_stat_lfbqc_get(stat);
   if (cb->buf_type == BUF_SM)
   {
      if (!addr2)
      {
         if (card->sm_addr)
       {
          addr2 = card->sm_addr;
          handle2 = card->sm_handle;
          card->sm_addr = 0x00000000;
          card->sm_handle = 0x00000000;
       }
       else /* (!sm_addr) */
       {
          card->sm_addr = addr1;
          card->sm_handle = handle1;
       }
      }      
   }
   else /* buf_type == BUF_LG */
   {
      if (!addr2)
      {
         if (card->lg_addr)
       {
          addr2 = card->lg_addr;
          handle2 = card->lg_handle;
          card->lg_addr = 0x00000000;
          card->lg_handle = 0x00000000;
       }
       else /* (!lg_addr) */
       {
          card->lg_addr = addr1;
          card->lg_handle = handle1;
       }
      }      
   }

   if (addr2)
   {
      if (cb->buf_type == BUF_SM)
      {
         if (card->sbfqc >= card->sbnr.max)
         {
            skb_unlink((struct sk_buff *) handle1, &card->sbpool.queue);
            dev_kfree_skb_any((struct sk_buff *) handle1);
            skb_unlink((struct sk_buff *) handle2, &card->sbpool.queue);
            dev_kfree_skb_any((struct sk_buff *) handle2);
            return;
         }
       else
            card->sbfqc += 2;
      }
      else /* (buf_type == BUF_LG) */
      {
         if (card->lbfqc >= card->lbnr.max)
         {
            skb_unlink((struct sk_buff *) handle1, &card->lbpool.queue);
            dev_kfree_skb_any((struct sk_buff *) handle1);
            skb_unlink((struct sk_buff *) handle2, &card->lbpool.queue);
            dev_kfree_skb_any((struct sk_buff *) handle2);
            return;
         }
         else
            card->lbfqc += 2;
      }

      ns_grab_res_lock(card, flags);

      while (CMD_BUSY(card));
      writel(addr2, card->membase + DR3);
      writel(handle2, card->membase + DR2);
      writel(addr1, card->membase + DR1);
      writel(handle1, card->membase + DR0);
      writel(NS_CMD_WRITE_FREEBUFQ | cb->buf_type, card->membase + CMD);
 
      spin_unlock_irqrestore(&card->res_lock, flags);

      XPRINTK("nicstar%d: Pushing %s buffers at 0x%x and 0x%x.\n", card->index,
              (cb->buf_type == BUF_SM ? "small" : "large"), addr1, addr2);
   }

   if (!card->efbie && card->sbfqc >= card->sbnr.min &&
       card->lbfqc >= card->lbnr.min)
   {
      card->efbie = 1;
      writel((readl(card->membase + CFG) | NS_CFG_EFBIE), card->membase + CFG);
   }

   return;
}



static irqreturn_t ns_irq_handler(int irq, void *dev_id)
{
   u32 stat_r;
   ns_dev *card;
   struct atm_dev *dev;
   unsigned long flags;

   card = (ns_dev *) dev_id;
   dev = card->atmdev;
   card->intcnt++;

   PRINTK("nicstar%d: NICStAR generated an interrupt\n", card->index);

   ns_grab_int_lock(card, flags);
   
   stat_r = readl(card->membase + STAT);

   /* Transmit Status Indicator has been written to T. S. Queue */
   if (stat_r & NS_STAT_TSIF)
   {
      TXPRINTK("nicstar%d: TSI interrupt\n", card->index);
      process_tsq(card);
      writel(NS_STAT_TSIF, card->membase + STAT);
   }
   
   /* Incomplete CS-PDU has been transmitted */
   if (stat_r & NS_STAT_TXICP)
   {
      writel(NS_STAT_TXICP, card->membase + STAT);
      TXPRINTK("nicstar%d: Incomplete CS-PDU transmitted.\n",
               card->index);
   }
   
   /* Transmit Status Queue 7/8 full */
   if (stat_r & NS_STAT_TSQF)
   {
      writel(NS_STAT_TSQF, card->membase + STAT);
      PRINTK("nicstar%d: TSQ full.\n", card->index);
      process_tsq(card);
   }
   
   /* Timer overflow */
   if (stat_r & NS_STAT_TMROF)
   {
      writel(NS_STAT_TMROF, card->membase + STAT);
      PRINTK("nicstar%d: Timer overflow.\n", card->index);
   }
   
   /* PHY device interrupt signal active */
   if (stat_r & NS_STAT_PHYI)
   {
      writel(NS_STAT_PHYI, card->membase + STAT);
      PRINTK("nicstar%d: PHY interrupt.\n", card->index);
      if (dev->phy && dev->phy->interrupt) {
         dev->phy->interrupt(dev);
      }
   }

   /* Small Buffer Queue is full */
   if (stat_r & NS_STAT_SFBQF)
   {
      writel(NS_STAT_SFBQF, card->membase + STAT);
      printk("nicstar%d: Small free buffer queue is full.\n", card->index);
   }
   
   /* Large Buffer Queue is full */
   if (stat_r & NS_STAT_LFBQF)
   {
      writel(NS_STAT_LFBQF, card->membase + STAT);
      printk("nicstar%d: Large free buffer queue is full.\n", card->index);
   }

   /* Receive Status Queue is full */
   if (stat_r & NS_STAT_RSQF)
   {
      writel(NS_STAT_RSQF, card->membase + STAT);
      printk("nicstar%d: RSQ full.\n", card->index);
      process_rsq(card);
   }

   /* Complete CS-PDU received */
   if (stat_r & NS_STAT_EOPDU)
   {
      RXPRINTK("nicstar%d: End of CS-PDU received.\n", card->index);
      process_rsq(card);
      writel(NS_STAT_EOPDU, card->membase + STAT);
   }

   /* Raw cell received */
   if (stat_r & NS_STAT_RAWCF)
   {
      writel(NS_STAT_RAWCF, card->membase + STAT);
#ifndef RCQ_SUPPORT
      printk("nicstar%d: Raw cell received and no support yet...\n",
             card->index);
#endif /* RCQ_SUPPORT */
      /* NOTE: the following procedure may keep a raw cell pending until the
               next interrupt. As this preliminary support is only meant to
               avoid buffer leakage, this is not an issue. */
      while (readl(card->membase + RAWCT) != card->rawch)
      {
         ns_rcqe *rawcell;

         rawcell = (ns_rcqe *) bus_to_virt(card->rawch);
         if (ns_rcqe_islast(rawcell))
         {
            struct sk_buff *oldbuf;

            oldbuf = card->rcbuf;
            card->rcbuf = (struct sk_buff *) ns_rcqe_nextbufhandle(rawcell);
            card->rawch = (u32) virt_to_bus(card->rcbuf->data);
            recycle_rx_buf(card, oldbuf);
         }
         else
            card->rawch += NS_RCQE_SIZE;
      }
   }

   /* Small buffer queue is empty */
   if (stat_r & NS_STAT_SFBQE)
   {
      int i;
      struct sk_buff *sb;

      writel(NS_STAT_SFBQE, card->membase + STAT);
      printk("nicstar%d: Small free buffer queue empty.\n",
             card->index);
      for (i = 0; i < card->sbnr.min; i++)
      {
         sb = dev_alloc_skb(NS_SMSKBSIZE);
         if (sb == NULL)
         {
            writel(readl(card->membase + CFG) & ~NS_CFG_EFBIE, card->membase + CFG);
            card->efbie = 0;
            break;
         }
         NS_SKB_CB(sb)->buf_type = BUF_SM;
         skb_queue_tail(&card->sbpool.queue, sb);
         skb_reserve(sb, NS_AAL0_HEADER);
         push_rxbufs(card, sb);
      }
      card->sbfqc = i;
      process_rsq(card);
   }

   /* Large buffer queue empty */
   if (stat_r & NS_STAT_LFBQE)
   {
      int i;
      struct sk_buff *lb;

      writel(NS_STAT_LFBQE, card->membase + STAT);
      printk("nicstar%d: Large free buffer queue empty.\n",
             card->index);
      for (i = 0; i < card->lbnr.min; i++)
      {
         lb = dev_alloc_skb(NS_LGSKBSIZE);
         if (lb == NULL)
         {
            writel(readl(card->membase + CFG) & ~NS_CFG_EFBIE, card->membase + CFG);
            card->efbie = 0;
            break;
         }
         NS_SKB_CB(lb)->buf_type = BUF_LG;
         skb_queue_tail(&card->lbpool.queue, lb);
         skb_reserve(lb, NS_SMBUFSIZE);
         push_rxbufs(card, lb);
      }
      card->lbfqc = i;
      process_rsq(card);
   }

   /* Receive Status Queue is 7/8 full */
   if (stat_r & NS_STAT_RSQAF)
   {
      writel(NS_STAT_RSQAF, card->membase + STAT);
      RXPRINTK("nicstar%d: RSQ almost full.\n", card->index);
      process_rsq(card);
   }
   
   spin_unlock_irqrestore(&card->int_lock, flags);
   PRINTK("nicstar%d: end of interrupt service\n", card->index);
   return IRQ_HANDLED;
}



static int ns_open(struct atm_vcc *vcc)
{
   ns_dev *card;
   vc_map *vc;
   unsigned long tmpl, modl;
   int tcr, tcra; /* target cell rate, and absolute value */
   int n = 0;           /* Number of entries in the TST. Initialized to remove
                           the compiler warning. */
   u32 u32d[4];
   int frscdi = 0;      /* Index of the SCD. Initialized to remove the compiler
                           warning. How I wish compilers were clever enough to
                     tell which variables can truly be used
                     uninitialized... */
   int inuse;           /* tx or rx vc already in use by another vcc */
   short vpi = vcc->vpi;
   int vci = vcc->vci;

   card = (ns_dev *) vcc->dev->dev_data;
   PRINTK("nicstar%d: opening vpi.vci %d.%d \n", card->index, (int) vpi, vci);
   if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0)
   {
      PRINTK("nicstar%d: unsupported AAL.\n", card->index);
      return -EINVAL;
   }

   vc = &(card->vcmap[vpi << card->vcibits | vci]);
   vcc->dev_data = vc;

   inuse = 0;
   if (vcc->qos.txtp.traffic_class != ATM_NONE && vc->tx)
      inuse = 1;
   if (vcc->qos.rxtp.traffic_class != ATM_NONE && vc->rx)
      inuse += 2;
   if (inuse)
   {
      printk("nicstar%d: %s vci already in use.\n", card->index,
             inuse == 1 ? "tx" : inuse == 2 ? "rx" : "tx and rx");
      return -EINVAL;
   }

   set_bit(ATM_VF_ADDR,&vcc->flags);

   /* NOTE: You are not allowed to modify an open connection's QOS. To change
      that, remove the ATM_VF_PARTIAL flag checking. There may be other changes
      needed to do that. */
   if (!test_bit(ATM_VF_PARTIAL,&vcc->flags))
   {
      scq_info *scq;
      
      set_bit(ATM_VF_PARTIAL,&vcc->flags);
      if (vcc->qos.txtp.traffic_class == ATM_CBR)
      {
         /* Check requested cell rate and availability of SCD */
         if (vcc->qos.txtp.max_pcr == 0 && vcc->qos.txtp.pcr == 0 &&
             vcc->qos.txtp.min_pcr == 0)
         {
            PRINTK("nicstar%d: trying to open a CBR vc with cell rate = 0 \n",
                 card->index);
          clear_bit(ATM_VF_PARTIAL,&vcc->flags);
          clear_bit(ATM_VF_ADDR,&vcc->flags);
            return -EINVAL;
         }

         tcr = atm_pcr_goal(&(vcc->qos.txtp));
         tcra = tcr >= 0 ? tcr : -tcr;
      
         PRINTK("nicstar%d: target cell rate = %d.\n", card->index,
                vcc->qos.txtp.max_pcr);

         tmpl = (unsigned long)tcra * (unsigned long)NS_TST_NUM_ENTRIES;
         modl = tmpl % card->max_pcr;

         n = (int)(tmpl / card->max_pcr);
         if (tcr > 0)
         {
            if (modl > 0) n++;
         }
         else if (tcr == 0)
         {
            if ((n = (card->tst_free_entries - NS_TST_RESERVED)) <= 0)
          {
               PRINTK("nicstar%d: no CBR bandwidth free.\n", card->index);
             clear_bit(ATM_VF_PARTIAL,&vcc->flags);
             clear_bit(ATM_VF_ADDR,&vcc->flags);
               return -EINVAL;
            }
         }

         if (n == 0)
         {
            printk("nicstar%d: selected bandwidth < granularity.\n", card->index);
          clear_bit(ATM_VF_PARTIAL,&vcc->flags);
          clear_bit(ATM_VF_ADDR,&vcc->flags);
            return -EINVAL;
         }

         if (n > (card->tst_free_entries - NS_TST_RESERVED))
         {
            PRINTK("nicstar%d: not enough free CBR bandwidth.\n", card->index);
          clear_bit(ATM_VF_PARTIAL,&vcc->flags);
          clear_bit(ATM_VF_ADDR,&vcc->flags);
            return -EINVAL;
         }
         else
            card->tst_free_entries -= n;

         XPRINTK("nicstar%d: writing %d tst entries.\n", card->index, n);
         for (frscdi = 0; frscdi < NS_FRSCD_NUM; frscdi++)
         {
            if (card->scd2vc[frscdi] == NULL)
            {
               card->scd2vc[frscdi] = vc;
               break;
          }
         }
         if (frscdi == NS_FRSCD_NUM)
         {
            PRINTK("nicstar%d: no SCD available for CBR channel.\n", card->index);
            card->tst_free_entries += n;
          clear_bit(ATM_VF_PARTIAL,&vcc->flags);
          clear_bit(ATM_VF_ADDR,&vcc->flags);
          return -EBUSY;
         }

         vc->cbr_scd = NS_FRSCD + frscdi * NS_FRSCD_SIZE;

         scq = get_scq(CBR_SCQSIZE, vc->cbr_scd);
         if (scq == NULL)
         {
            PRINTK("nicstar%d: can't get fixed rate SCQ.\n", card->index);
            card->scd2vc[frscdi] = NULL;
            card->tst_free_entries += n;
          clear_bit(ATM_VF_PARTIAL,&vcc->flags);
          clear_bit(ATM_VF_ADDR,&vcc->flags);
            return -ENOMEM;
         }
       vc->scq = scq;
         u32d[0] = (u32) virt_to_bus(scq->base);
         u32d[1] = (u32) 0x00000000;
         u32d[2] = (u32) 0xffffffff;
         u32d[3] = (u32) 0x00000000;
         ns_write_sram(card, vc->cbr_scd, u32d, 4);
         
       fill_tst(card, n, vc);
      }
      else if (vcc->qos.txtp.traffic_class == ATM_UBR)
      {
         vc->cbr_scd = 0x00000000;
       vc->scq = card->scq0;
      }
      
      if (vcc->qos.txtp.traffic_class != ATM_NONE)
      {
         vc->tx = 1;
       vc->tx_vcc = vcc;
       vc->tbd_count = 0;
      }
      if (vcc->qos.rxtp.traffic_class != ATM_NONE)
      {
         u32 status;
      
         vc->rx = 1;
         vc->rx_vcc = vcc;
         vc->rx_iov = NULL;

       /* Open the connection in hardware */
       if (vcc->qos.aal == ATM_AAL5)
          status = NS_RCTE_AAL5 | NS_RCTE_CONNECTOPEN;
       else /* vcc->qos.aal == ATM_AAL0 */
          status = NS_RCTE_AAL0 | NS_RCTE_CONNECTOPEN;
#ifdef RCQ_SUPPORT
         status |= NS_RCTE_RAWCELLINTEN;
#endif /* RCQ_SUPPORT */
         ns_write_sram(card, NS_RCT + (vpi << card->vcibits | vci) *
                     NS_RCT_ENTRY_SIZE, &status, 1);
      }
      
   }
   
   set_bit(ATM_VF_READY,&vcc->flags);
   return 0;
}



static void ns_close(struct atm_vcc *vcc)
{
   vc_map *vc;
   ns_dev *card;
   u32 data;
   int i;
   
   vc = vcc->dev_data;
   card = vcc->dev->dev_data;
   PRINTK("nicstar%d: closing vpi.vci %d.%d \n", card->index,
          (int) vcc->vpi, vcc->vci);

   clear_bit(ATM_VF_READY,&vcc->flags);
   
   if (vcc->qos.rxtp.traffic_class != ATM_NONE)
   {
      u32 addr;
      unsigned long flags;
      
      addr = NS_RCT + (vcc->vpi << card->vcibits | vcc->vci) * NS_RCT_ENTRY_SIZE;
      ns_grab_res_lock(card, flags);
      while(CMD_BUSY(card));
      writel(NS_CMD_CLOSE_CONNECTION | addr << 2, card->membase + CMD);
      spin_unlock_irqrestore(&card->res_lock, flags);
      
      vc->rx = 0;
      if (vc->rx_iov != NULL)
      {
       struct sk_buff *iovb;
       u32 stat;
   
         stat = readl(card->membase + STAT);
         card->sbfqc = ns_stat_sfbqc_get(stat);   
         card->lbfqc = ns_stat_lfbqc_get(stat);

         PRINTK("nicstar%d: closing a VC with pending rx buffers.\n",
              card->index);
         iovb = vc->rx_iov;
         recycle_iovec_rx_bufs(card, (struct iovec *) iovb->data,
                             NS_SKB(iovb)->iovcnt);
         NS_SKB(iovb)->iovcnt = 0;
         NS_SKB(iovb)->vcc = NULL;
         ns_grab_int_lock(card, flags);
         recycle_iov_buf(card, iovb);
         spin_unlock_irqrestore(&card->int_lock, flags);
         vc->rx_iov = NULL;
      }
   }

   if (vcc->qos.txtp.traffic_class != ATM_NONE)
   {
      vc->tx = 0;
   }

   if (vcc->qos.txtp.traffic_class == ATM_CBR)
   {
      unsigned long flags;
      ns_scqe *scqep;
      scq_info *scq;

      scq = vc->scq;

      for (;;)
      {
         ns_grab_scq_lock(card, scq, flags);
         scqep = scq->next;
         if (scqep == scq->base)
            scqep = scq->last;
         else
            scqep--;
         if (scqep == scq->tail)
         {
            spin_unlock_irqrestore(&scq->lock, flags);
            break;
         }
         /* If the last entry is not a TSR, place one in the SCQ in order to
            be able to completely drain it and then close. */
         if (!ns_scqe_is_tsr(scqep) && scq->tail != scq->next)
         {
            ns_scqe tsr;
            u32 scdi, scqi;
            u32 data;
            int index;

            tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
            scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
            scqi = scq->next - scq->base;
            tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
            tsr.word_3 = 0x00000000;
            tsr.word_4 = 0x00000000;
            *scq->next = tsr;
            index = (int) scqi;
            scq->skb[index] = NULL;
            if (scq->next == scq->last)
               scq->next = scq->base;
            else
               scq->next++;
            data = (u32) virt_to_bus(scq->next);
            ns_write_sram(card, scq->scd, &data, 1);
         }
         spin_unlock_irqrestore(&scq->lock, flags);
         schedule();
      }

      /* Free all TST entries */
      data = NS_TST_OPCODE_VARIABLE;
      for (i = 0; i < NS_TST_NUM_ENTRIES; i++)
      {
         if (card->tste2vc[i] == vc)
       {
            ns_write_sram(card, card->tst_addr + i, &data, 1);
            card->tste2vc[i] = NULL;
            card->tst_free_entries++;
       }
      }
      
      card->scd2vc[(vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE] = NULL;
      free_scq(vc->scq, vcc);
   }

   /* remove all references to vcc before deleting it */
   if (vcc->qos.txtp.traffic_class != ATM_NONE)
   {
     unsigned long flags;
     scq_info *scq = card->scq0;

     ns_grab_scq_lock(card, scq, flags);

     for(i = 0; i < scq->num_entries; i++) {
       if(scq->skb[i] && ATM_SKB(scq->skb[i])->vcc == vcc) {
        ATM_SKB(scq->skb[i])->vcc = NULL;
      atm_return(vcc, scq->skb[i]->truesize);
        PRINTK("nicstar: deleted pending vcc mapping\n");
       }
     }

     spin_unlock_irqrestore(&scq->lock, flags);
   }

   vcc->dev_data = NULL;
   clear_bit(ATM_VF_PARTIAL,&vcc->flags);
   clear_bit(ATM_VF_ADDR,&vcc->flags);

#ifdef RX_DEBUG
   {
      u32 stat, cfg;
      stat = readl(card->membase + STAT);
      cfg = readl(card->membase + CFG);
      printk("STAT = 0x%08X  CFG = 0x%08X  \n", stat, cfg);
      printk("TSQ: base = 0x%08X  next = 0x%08X  last = 0x%08X  TSQT = 0x%08X \n",
             (u32) card->tsq.base, (u32) card->tsq.next,(u32) card->tsq.last,
           readl(card->membase + TSQT));
      printk("RSQ: base = 0x%08X  next = 0x%08X  last = 0x%08X  RSQT = 0x%08X \n",
             (u32) card->rsq.base, (u32) card->rsq.next,(u32) card->rsq.last,
           readl(card->membase + RSQT));
      printk("Empty free buffer queue interrupt %s \n",
             card->efbie ? "enabled" : "disabled");
      printk("SBCNT = %d  count = %d   LBCNT = %d count = %d \n",
             ns_stat_sfbqc_get(stat), card->sbpool.count,
           ns_stat_lfbqc_get(stat), card->lbpool.count);
      printk("hbpool.count = %d  iovpool.count = %d \n",
             card->hbpool.count, card->iovpool.count);
   }
#endif /* RX_DEBUG */
}



static void fill_tst(ns_dev *card, int n, vc_map *vc)
{
   u32 new_tst;
   unsigned long cl;
   int e, r;
   u32 data;
      
   /* It would be very complicated to keep the two TSTs synchronized while
      assuring that writes are only made to the inactive TST. So, for now I
      will use only one TST. If problems occur, I will change this again */
   
   new_tst = card->tst_addr;

   /* Fill procedure */

   for (e = 0; e < NS_TST_NUM_ENTRIES; e++)
   {
      if (card->tste2vc[e] == NULL)
         break;
   }
   if (e == NS_TST_NUM_ENTRIES) {
      printk("nicstar%d: No free TST entries found. \n", card->index);
      return;
   }

   r = n;
   cl = NS_TST_NUM_ENTRIES;
   data = ns_tste_make(NS_TST_OPCODE_FIXED, vc->cbr_scd);
      
   while (r > 0)
   {
      if (cl >= NS_TST_NUM_ENTRIES && card->tste2vc[e] == NULL)
      {
         card->tste2vc[e] = vc;
         ns_write_sram(card, new_tst + e, &data, 1);
         cl -= NS_TST_NUM_ENTRIES;
         r--;
      }

      if (++e == NS_TST_NUM_ENTRIES) {
         e = 0;
      }
      cl += n;
   }
   
   /* End of fill procedure */
   
   data = ns_tste_make(NS_TST_OPCODE_END, new_tst);
   ns_write_sram(card, new_tst + NS_TST_NUM_ENTRIES, &data, 1);
   ns_write_sram(card, card->tst_addr + NS_TST_NUM_ENTRIES, &data, 1);
   card->tst_addr = new_tst;
}



static int ns_send(struct atm_vcc *vcc, struct sk_buff *skb)
{
   ns_dev *card;
   vc_map *vc;
   scq_info *scq;
   unsigned long buflen;
   ns_scqe scqe;
   u32 flags;           /* TBD flags, not CPU flags */
   
   card = vcc->dev->dev_data;
   TXPRINTK("nicstar%d: ns_send() called.\n", card->index);
   if ((vc = (vc_map *) vcc->dev_data) == NULL)
   {
      printk("nicstar%d: vcc->dev_data == NULL on ns_send().\n", card->index);
      atomic_inc(&vcc->stats->tx_err);
      dev_kfree_skb_any(skb);
      return -EINVAL;
   }
   
   if (!vc->tx)
   {
      printk("nicstar%d: Trying to transmit on a non-tx VC.\n", card->index);
      atomic_inc(&vcc->stats->tx_err);
      dev_kfree_skb_any(skb);
      return -EINVAL;
   }
   
   if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0)
   {
      printk("nicstar%d: Only AAL0 and AAL5 are supported.\n", card->index);
      atomic_inc(&vcc->stats->tx_err);
      dev_kfree_skb_any(skb);
      return -EINVAL;
   }
   
   if (skb_shinfo(skb)->nr_frags != 0)
   {
      printk("nicstar%d: No scatter-gather yet.\n", card->index);
      atomic_inc(&vcc->stats->tx_err);
      dev_kfree_skb_any(skb);
      return -EINVAL;
   }
   
   ATM_SKB(skb)->vcc = vcc;

   if (vcc->qos.aal == ATM_AAL5)
   {
      buflen = (skb->len + 47 + 8) / 48 * 48;   /* Multiple of 48 */
      flags = NS_TBD_AAL5;
      scqe.word_2 = cpu_to_le32((u32) virt_to_bus(skb->data));
      scqe.word_3 = cpu_to_le32((u32) skb->len);
      scqe.word_4 = ns_tbd_mkword_4(0, (u32) vcc->vpi, (u32) vcc->vci, 0,
                           ATM_SKB(skb)->atm_options & ATM_ATMOPT_CLP ? 1 : 0);
      flags |= NS_TBD_EOPDU;
   }
   else /* (vcc->qos.aal == ATM_AAL0) */
   {
      buflen = ATM_CELL_PAYLOAD;    /* i.e., 48 bytes */
      flags = NS_TBD_AAL0;
      scqe.word_2 = cpu_to_le32((u32) virt_to_bus(skb->data) + NS_AAL0_HEADER);
      scqe.word_3 = cpu_to_le32(0x00000000);
      if (*skb->data & 0x02)  /* Payload type 1 - end of pdu */
         flags |= NS_TBD_EOPDU;
      scqe.word_4 = cpu_to_le32(*((u32 *) skb->data) & ~NS_TBD_VC_MASK);
      /* Force the VPI/VCI to be the same as in VCC struct */
      scqe.word_4 |= cpu_to_le32((((u32) vcc->vpi) << NS_TBD_VPI_SHIFT |
                                 ((u32) vcc->vci) << NS_TBD_VCI_SHIFT) &
                                 NS_TBD_VC_MASK);
   }

   if (vcc->qos.txtp.traffic_class == ATM_CBR)
   {
      scqe.word_1 = ns_tbd_mkword_1_novbr(flags, (u32) buflen);
      scq = ((vc_map *) vcc->dev_data)->scq;
   }
   else
   {
      scqe.word_1 = ns_tbd_mkword_1(flags, (u32) 1, (u32) 1, (u32) buflen);
      scq = card->scq0;
   }

   if (push_scqe(card, vc, scq, &scqe, skb) != 0)
   {
      atomic_inc(&vcc->stats->tx_err);
      dev_kfree_skb_any(skb);
      return -EIO;
   }
   atomic_inc(&vcc->stats->tx);

   return 0;
}



static int push_scqe(ns_dev *card, vc_map *vc, scq_info *scq, ns_scqe *tbd,
                     struct sk_buff *skb)
{
   unsigned long flags;
   ns_scqe tsr;
   u32 scdi, scqi;
   int scq_is_vbr;
   u32 data;
   int index;
   
   ns_grab_scq_lock(card, scq, flags);
   while (scq->tail == scq->next)
   {
      if (in_interrupt()) {
         spin_unlock_irqrestore(&scq->lock, flags);
         printk("nicstar%d: Error pushing TBD.\n", card->index);
         return 1;
      }

      scq->full = 1;
      spin_unlock_irqrestore(&scq->lock, flags);
      interruptible_sleep_on_timeout(&scq->scqfull_waitq, SCQFULL_TIMEOUT);
      ns_grab_scq_lock(card, scq, flags);

      if (scq->full) {
         spin_unlock_irqrestore(&scq->lock, flags);
         printk("nicstar%d: Timeout pushing TBD.\n", card->index);
         return 1;
      }
   }
   *scq->next = *tbd;
   index = (int) (scq->next - scq->base);
   scq->skb[index] = skb;
   XPRINTK("nicstar%d: sending skb at 0x%x (pos %d).\n",
           card->index, (u32) skb, index);
   XPRINTK("nicstar%d: TBD written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%x.\n",
           card->index, le32_to_cpu(tbd->word_1), le32_to_cpu(tbd->word_2),
           le32_to_cpu(tbd->word_3), le32_to_cpu(tbd->word_4),
           (u32) scq->next);
   if (scq->next == scq->last)
      scq->next = scq->base;
   else
      scq->next++;

   vc->tbd_count++;
   if (scq->num_entries == VBR_SCQ_NUM_ENTRIES)
   {
      scq->tbd_count++;
      scq_is_vbr = 1;
   }
   else
      scq_is_vbr = 0;

   if (vc->tbd_count >= MAX_TBD_PER_VC || scq->tbd_count >= MAX_TBD_PER_SCQ)
   {
      int has_run = 0;

      while (scq->tail == scq->next)
      {
         if (in_interrupt()) {
            data = (u32) virt_to_bus(scq->next);
            ns_write_sram(card, scq->scd, &data, 1);
            spin_unlock_irqrestore(&scq->lock, flags);
            printk("nicstar%d: Error pushing TSR.\n", card->index);
            return 0;
         }

         scq->full = 1;
         if (has_run++) break;
         spin_unlock_irqrestore(&scq->lock, flags);
         interruptible_sleep_on_timeout(&scq->scqfull_waitq, SCQFULL_TIMEOUT);
         ns_grab_scq_lock(card, scq, flags);
      }

      if (!scq->full)
      {
         tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
         if (scq_is_vbr)
            scdi = NS_TSR_SCDISVBR;
         else
            scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
         scqi = scq->next - scq->base;
         tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
         tsr.word_3 = 0x00000000;
         tsr.word_4 = 0x00000000;

         *scq->next = tsr;
         index = (int) scqi;
         scq->skb[index] = NULL;
         XPRINTK("nicstar%d: TSR written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%x.\n",
                 card->index, le32_to_cpu(tsr.word_1), le32_to_cpu(tsr.word_2),
                 le32_to_cpu(tsr.word_3), le32_to_cpu(tsr.word_4),
             (u32) scq->next);
         if (scq->next == scq->last)
            scq->next = scq->base;
         else
            scq->next++;
         vc->tbd_count = 0;
         scq->tbd_count = 0;
      }
      else
         PRINTK("nicstar%d: Timeout pushing TSR.\n", card->index);
   }
   data = (u32) virt_to_bus(scq->next);
   ns_write_sram(card, scq->scd, &data, 1);
   
   spin_unlock_irqrestore(&scq->lock, flags);
   
   return 0;
}



static void process_tsq(ns_dev *card)
{
   u32 scdi;
   scq_info *scq;
   ns_tsi *previous = NULL, *one_ahead, *two_ahead;
   int serviced_entries;   /* flag indicating at least on entry was serviced */
   
   serviced_entries = 0;
   
   if (card->tsq.next == card->tsq.last)
      one_ahead = card->tsq.base;
   else
      one_ahead = card->tsq.next + 1;

   if (one_ahead == card->tsq.last)
      two_ahead = card->tsq.base;
   else
      two_ahead = one_ahead + 1;
   
   while (!ns_tsi_isempty(card->tsq.next) || !ns_tsi_isempty(one_ahead) ||
          !ns_tsi_isempty(two_ahead))
          /* At most two empty, as stated in the 77201 errata */
   {
      serviced_entries = 1;
    
      /* Skip the one or two possible empty entries */
      while (ns_tsi_isempty(card->tsq.next)) {
         if (card->tsq.next == card->tsq.last)
            card->tsq.next = card->tsq.base;
         else
            card->tsq.next++;
      }
    
      if (!ns_tsi_tmrof(card->tsq.next))
      {
         scdi = ns_tsi_getscdindex(card->tsq.next);
       if (scdi == NS_TSI_SCDISVBR)
          scq = card->scq0;
       else
       {
          if (card->scd2vc[scdi] == NULL)
          {
             printk("nicstar%d: could not find VC from SCD index.\n",
                    card->index);
               ns_tsi_init(card->tsq.next);
               return;
            }
            scq = card->scd2vc[scdi]->scq;
         }
         drain_scq(card, scq, ns_tsi_getscqpos(card->tsq.next));
         scq->full = 0;
         wake_up_interruptible(&(scq->scqfull_waitq));
      }

      ns_tsi_init(card->tsq.next);
      previous = card->tsq.next;
      if (card->tsq.next == card->tsq.last)
         card->tsq.next = card->tsq.base;
      else
         card->tsq.next++;

      if (card->tsq.next == card->tsq.last)
         one_ahead = card->tsq.base;
      else
         one_ahead = card->tsq.next + 1;

      if (one_ahead == card->tsq.last)
         two_ahead = card->tsq.base;
      else
         two_ahead = one_ahead + 1;
   }

   if (serviced_entries) {
      writel((((u32) previous) - ((u32) card->tsq.base)),
             card->membase + TSQH);
   }
}



static void drain_scq(ns_dev *card, scq_info *scq, int pos)
{
   struct atm_vcc *vcc;
   struct sk_buff *skb;
   int i;
   unsigned long flags;
   
   XPRINTK("nicstar%d: drain_scq() called, scq at 0x%x, pos %d.\n",
           card->index, (u32) scq, pos);
   if (pos >= scq->num_entries)
   {
      printk("nicstar%d: Bad index on drain_scq().\n", card->index);
      return;
   }

   ns_grab_scq_lock(card, scq, flags);
   i = (int) (scq->tail - scq->base);
   if (++i == scq->num_entries)
      i = 0;
   while (i != pos)
   {
      skb = scq->skb[i];
      XPRINTK("nicstar%d: freeing skb at 0x%x (index %d).\n",
              card->index, (u32) skb, i);
      if (skb != NULL)
      {
         vcc = ATM_SKB(skb)->vcc;
       if (vcc && vcc->pop != NULL) {
          vcc->pop(vcc, skb);
       } else {
          dev_kfree_skb_irq(skb);
         }
       scq->skb[i] = NULL;
      }
      if (++i == scq->num_entries)
         i = 0;
   }
   scq->tail = scq->base + pos;
   spin_unlock_irqrestore(&scq->lock, flags);
}



static void process_rsq(ns_dev *card)
{
   ns_rsqe *previous;

   if (!ns_rsqe_valid(card->rsq.next))
      return;
   do {
      dequeue_rx(card, card->rsq.next);
      ns_rsqe_init(card->rsq.next);
      previous = card->rsq.next;
      if (card->rsq.next == card->rsq.last)
         card->rsq.next = card->rsq.base;
      else
         card->rsq.next++;
   } while (ns_rsqe_valid(card->rsq.next));
   writel((((u32) previous) - ((u32) card->rsq.base)),
          card->membase + RSQH);
}



static void dequeue_rx(ns_dev *card, ns_rsqe *rsqe)
{
   u32 vpi, vci;
   vc_map *vc;
   struct sk_buff *iovb;
   struct iovec *iov;
   struct atm_vcc *vcc;
   struct sk_buff *skb;
   unsigned short aal5_len;
   int len;
   u32 stat;

   stat = readl(card->membase + STAT);
   card->sbfqc = ns_stat_sfbqc_get(stat);   
   card->lbfqc = ns_stat_lfbqc_get(stat);

   skb = (struct sk_buff *) le32_to_cpu(rsqe->buffer_handle);
   vpi = ns_rsqe_vpi(rsqe);
   vci = ns_rsqe_vci(rsqe);
   if (vpi >= 1UL << card->vpibits || vci >= 1UL << card->vcibits)
   {
      printk("nicstar%d: SDU received for out-of-range vc %d.%d.\n",
             card->index, vpi, vci);
      recycle_rx_buf(card, skb);
      return;
   }
   
   vc = &(card->vcmap[vpi << card->vcibits | vci]);
   if (!vc->rx)
   {
      RXPRINTK("nicstar%d: SDU received on non-rx vc %d.%d.\n",
             card->index, vpi, vci);
      recycle_rx_buf(card, skb);
      return;
   }

   vcc = vc->rx_vcc;

   if (vcc->qos.aal == ATM_AAL0)
   {
      struct sk_buff *sb;
      unsigned char *cell;
      int i;

      cell = skb->data;
      for (i = ns_rsqe_cellcount(rsqe); i; i--)
      {
         if ((sb = dev_alloc_skb(NS_SMSKBSIZE)) == NULL)
         {
            printk("nicstar%d: Can't allocate buffers for aal0.\n",
                   card->index);
            atomic_add(i,&vcc->stats->rx_drop);
            break;
         }
         if (!atm_charge(vcc, sb->truesize))
         {
            RXPRINTK("nicstar%d: atm_charge() dropped aal0 packets.\n",
                     card->index);
            atomic_add(i-1,&vcc->stats->rx_drop); /* already increased by 1 */
            dev_kfree_skb_any(sb);
            break;
         }
         /* Rebuild the header */
         *((u32 *) sb->data) = le32_to_cpu(rsqe->word_1) << 4 |
                               (ns_rsqe_clp(rsqe) ? 0x00000001 : 0x00000000);
         if (i == 1 && ns_rsqe_eopdu(rsqe))
            *((u32 *) sb->data) |= 0x00000002;
         skb_put(sb, NS_AAL0_HEADER);
         memcpy(skb_tail_pointer(sb), cell, ATM_CELL_PAYLOAD);
         skb_put(sb, ATM_CELL_PAYLOAD);
         ATM_SKB(sb)->vcc = vcc;
       __net_timestamp(sb);
         vcc->push(vcc, sb);
         atomic_inc(&vcc->stats->rx);
         cell += ATM_CELL_PAYLOAD;
      }

      recycle_rx_buf(card, skb);
      return;
   }

   /* To reach this point, the AAL layer can only be AAL5 */

   if ((iovb = vc->rx_iov) == NULL)
   {
      iovb = skb_dequeue(&(card->iovpool.queue));
      if (iovb == NULL)       /* No buffers in the queue */
      {
         iovb = alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC);
       if (iovb == NULL)
       {
          printk("nicstar%d: Out of iovec buffers.\n", card->index);
            atomic_inc(&vcc->stats->rx_drop);
            recycle_rx_buf(card, skb);
            return;
       }
         NS_SKB_CB(iovb)->buf_type = BUF_NONE;
      }
      else
         if (--card->iovpool.count < card->iovnr.min)
       {
          struct sk_buff *new_iovb;
          if ((new_iovb = alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC)) != NULL)
          {
               NS_SKB_CB(iovb)->buf_type = BUF_NONE;
               skb_queue_tail(&card->iovpool.queue, new_iovb);
               card->iovpool.count++;
          }
       }
      vc->rx_iov = iovb;
      NS_SKB(iovb)->iovcnt = 0;
      iovb->len = 0;
      iovb->data = iovb->head;
      skb_reset_tail_pointer(iovb);
      NS_SKB(iovb)->vcc = vcc;
      /* IMPORTANT: a pointer to the sk_buff containing the small or large
                    buffer is stored as iovec base, NOT a pointer to the 
                  small or large buffer itself. */
   }
   else if (NS_SKB(iovb)->iovcnt >= NS_MAX_IOVECS)
   {
      printk("nicstar%d: received too big AAL5 SDU.\n", card->index);
      atomic_inc(&vcc->stats->rx_err);
      recycle_iovec_rx_bufs(card, (struct iovec *) iovb->data, NS_MAX_IOVECS);
      NS_SKB(iovb)->iovcnt = 0;
      iovb->len = 0;
      iovb->data = iovb->head;
      skb_reset_tail_pointer(iovb);
      NS_SKB(iovb)->vcc = vcc;
   }
   iov = &((struct iovec *) iovb->data)[NS_SKB(iovb)->iovcnt++];
   iov->iov_base = (void *) skb;
   iov->iov_len = ns_rsqe_cellcount(rsqe) * 48;
   iovb->len += iov->iov_len;

   if (NS_SKB(iovb)->iovcnt == 1)
   {
      if (NS_SKB_CB(skb)->buf_type != BUF_SM)
      {
         printk("nicstar%d: Expected a small buffer, and this is not one.\n",
              card->index);
         which_list(card, skb);
         atomic_inc(&vcc->stats->rx_err);
         recycle_rx_buf(card, skb);
         vc->rx_iov = NULL;
         recycle_iov_buf(card, iovb);
         return;
      }
   }
   else /* NS_SKB(iovb)->iovcnt >= 2 */
   {
      if (NS_SKB_CB(skb)->buf_type != BUF_LG)
      {
         printk("nicstar%d: Expected a large buffer, and this is not one.\n",
              card->index);
         which_list(card, skb);
         atomic_inc(&vcc->stats->rx_err);
         recycle_iovec_rx_bufs(card, (struct iovec *) iovb->data,
                             NS_SKB(iovb)->iovcnt);
         vc->rx_iov = NULL;
         recycle_iov_buf(card, iovb);
       return;
      }
   }

   if (ns_rsqe_eopdu(rsqe))
   {
      /* This works correctly regardless of the endianness of the host */
      unsigned char *L1L2 = (unsigned char *)((u32)skb->data +
                                              iov->iov_len - 6);
      aal5_len = L1L2[0] << 8 | L1L2[1];
      len = (aal5_len == 0x0000) ? 0x10000 : aal5_len;
      if (ns_rsqe_crcerr(rsqe) ||
          len + 8 > iovb->len || len + (47 + 8) < iovb->len)
      {
         printk("nicstar%d: AAL5 CRC error", card->index);
         if (len + 8 > iovb->len || len + (47 + 8) < iovb->len)
            printk(" - PDU size mismatch.\n");
         else
            printk(".\n");
         atomic_inc(&vcc->stats->rx_err);
         recycle_iovec_rx_bufs(card, (struct iovec *) iovb->data,
         NS_SKB(iovb)->iovcnt);
       vc->rx_iov = NULL;
         recycle_iov_buf(card, iovb);
       return;
      }

      /* By this point we (hopefully) have a complete SDU without errors. */

      if (NS_SKB(iovb)->iovcnt == 1)      /* Just a small buffer */
      {
         /* skb points to a small buffer */
         if (!atm_charge(vcc, skb->truesize))
         {
            push_rxbufs(card, skb);
            atomic_inc(&vcc->stats->rx_drop);
         }
         else
       {
            skb_put(skb, len);
            dequeue_sm_buf(card, skb);
#ifdef NS_USE_DESTRUCTORS
            skb->destructor = ns_sb_destructor;
#endif /* NS_USE_DESTRUCTORS */
            ATM_SKB(skb)->vcc = vcc;
          __net_timestamp(skb);
            vcc->push(vcc, skb);
            atomic_inc(&vcc->stats->rx);
         }
      }
      else if (NS_SKB(iovb)->iovcnt == 2) /* One small plus one large buffer */
      {
         struct sk_buff *sb;

         sb = (struct sk_buff *) (iov - 1)->iov_base;
         /* skb points to a large buffer */

         if (len <= NS_SMBUFSIZE)
       {
            if (!atm_charge(vcc, sb->truesize))
            {
               push_rxbufs(card, sb);
               atomic_inc(&vcc->stats->rx_drop);
            }
            else
          {
               skb_put(sb, len);
               dequeue_sm_buf(card, sb);
#ifdef NS_USE_DESTRUCTORS
               sb->destructor = ns_sb_destructor;
#endif /* NS_USE_DESTRUCTORS */
               ATM_SKB(sb)->vcc = vcc;
             __net_timestamp(sb);
               vcc->push(vcc, sb);
               atomic_inc(&vcc->stats->rx);
            }

            push_rxbufs(card, skb);

       }
       else             /* len > NS_SMBUFSIZE, the usual case */
       {
            if (!atm_charge(vcc, skb->truesize))
            {
               push_rxbufs(card, skb);
               atomic_inc(&vcc->stats->rx_drop);
            }
            else
            {
               dequeue_lg_buf(card, skb);
#ifdef NS_USE_DESTRUCTORS
               skb->destructor = ns_lb_destructor;
#endif /* NS_USE_DESTRUCTORS */
               skb_push(skb, NS_SMBUFSIZE);
               skb_copy_from_linear_data(sb, skb->data, NS_SMBUFSIZE);
               skb_put(skb, len - NS_SMBUFSIZE);
               ATM_SKB(skb)->vcc = vcc;
             __net_timestamp(skb);
               vcc->push(vcc, skb);
               atomic_inc(&vcc->stats->rx);
            }

            push_rxbufs(card, sb);

         }
       
      }
      else                    /* Must push a huge buffer */
      {
         struct sk_buff *hb, *sb, *lb;
       int remaining, tocopy;
         int j;

         hb = skb_dequeue(&(card->hbpool.queue));
         if (hb == NULL)            /* No buffers in the queue */
         {

            hb = dev_alloc_skb(NS_HBUFSIZE);
            if (hb == NULL)
            {
               printk("nicstar%d: Out of huge buffers.\n", card->index);
               atomic_inc(&vcc->stats->rx_drop);
               recycle_iovec_rx_bufs(card, (struct iovec *) iovb->data,
                                   NS_SKB(iovb)->iovcnt);
               vc->rx_iov = NULL;
               recycle_iov_buf(card, iovb);
               return;
            }
            else if (card->hbpool.count < card->hbnr.min)
          {
               struct sk_buff *new_hb;
               if ((new_hb = dev_alloc_skb(NS_HBUFSIZE)) != NULL)
               {
                  skb_queue_tail(&card->hbpool.queue, new_hb);
                  card->hbpool.count++;
               }
            }
            NS_SKB_CB(hb)->buf_type = BUF_NONE;
       }
       else
         if (--card->hbpool.count < card->hbnr.min)
         {
            struct sk_buff *new_hb;
            if ((new_hb = dev_alloc_skb(NS_HBUFSIZE)) != NULL)
            {
               NS_SKB_CB(new_hb)->buf_type = BUF_NONE;
               skb_queue_tail(&card->hbpool.queue, new_hb);
               card->hbpool.count++;
            }
            if (card->hbpool.count < card->hbnr.min)
          {
               if ((new_hb = dev_alloc_skb(NS_HBUFSIZE)) != NULL)
               {
                  NS_SKB_CB(new_hb)->buf_type = BUF_NONE;
                  skb_queue_tail(&card->hbpool.queue, new_hb);
                  card->hbpool.count++;
               }
            }
         }

         iov = (struct iovec *) iovb->data;

         if (!atm_charge(vcc, hb->truesize))
       {
            recycle_iovec_rx_bufs(card, iov, NS_SKB(iovb)->iovcnt);
            if (card->hbpool.count < card->hbnr.max)
            {
               skb_queue_tail(&card->hbpool.queue, hb);
               card->hbpool.count++;
            }
          else
             dev_kfree_skb_any(hb);
          atomic_inc(&vcc->stats->rx_drop);
         }
         else
       {
            /* Copy the small buffer to the huge buffer */
            sb = (struct sk_buff *) iov->iov_base;
            skb_copy_from_linear_data(sb, hb->data, iov->iov_len);
            skb_put(hb, iov->iov_len);
            remaining = len - iov->iov_len;
            iov++;
            /* Free the small buffer */
            push_rxbufs(card, sb);

            /* Copy all large buffers to the huge buffer and free them */
            for (j = 1; j < NS_SKB(iovb)->iovcnt; j++)
            {
               lb = (struct sk_buff *) iov->iov_base;
               tocopy = min_t(int, remaining, iov->iov_len);
               skb_copy_from_linear_data(lb, skb_tail_pointer(hb), tocopy);
               skb_put(hb, tocopy);
               iov++;
               remaining -= tocopy;
               push_rxbufs(card, lb);
            }
#ifdef EXTRA_DEBUG
            if (remaining != 0 || hb->len != len)
               printk("nicstar%d: Huge buffer len mismatch.\n", card->index);
#endif /* EXTRA_DEBUG */
            ATM_SKB(hb)->vcc = vcc;
#ifdef NS_USE_DESTRUCTORS
            hb->destructor = ns_hb_destructor;
#endif /* NS_USE_DESTRUCTORS */
          __net_timestamp(hb);
            vcc->push(vcc, hb);
            atomic_inc(&vcc->stats->rx);
         }
      }

      vc->rx_iov = NULL;
      recycle_iov_buf(card, iovb);
   }

}



#ifdef NS_USE_DESTRUCTORS

static void ns_sb_destructor(struct sk_buff *sb)
{
   ns_dev *card;
   u32 stat;

   card = (ns_dev *) ATM_SKB(sb)->vcc->dev->dev_data;
   stat = readl(card->membase + STAT);
   card->sbfqc = ns_stat_sfbqc_get(stat);   
   card->lbfqc = ns_stat_lfbqc_get(stat);

   do
   {
      sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
      if (sb == NULL)
         break;
      NS_SKB_CB(sb)->buf_type = BUF_SM;
      skb_queue_tail(&card->sbpool.queue, sb);
      skb_reserve(sb, NS_AAL0_HEADER);
      push_rxbufs(card, sb);
   } while (card->sbfqc < card->sbnr.min);
}



static void ns_lb_destructor(struct sk_buff *lb)
{
   ns_dev *card;
   u32 stat;

   card = (ns_dev *) ATM_SKB(lb)->vcc->dev->dev_data;
   stat = readl(card->membase + STAT);
   card->sbfqc = ns_stat_sfbqc_get(stat);   
   card->lbfqc = ns_stat_lfbqc_get(stat);

   do
   {
      lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
      if (lb == NULL)
         break;
      NS_SKB_CB(lb)->buf_type = BUF_LG;
      skb_queue_tail(&card->lbpool.queue, lb);
      skb_reserve(lb, NS_SMBUFSIZE);
      push_rxbufs(card, lb);
   } while (card->lbfqc < card->lbnr.min);
}



static void ns_hb_destructor(struct sk_buff *hb)
{
   ns_dev *card;

   card = (ns_dev *) ATM_SKB(hb)->vcc->dev->dev_data;

   while (card->hbpool.count < card->hbnr.init)
   {
      hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
      if (hb == NULL)
         break;
      NS_SKB_CB(hb)->buf_type = BUF_NONE;
      skb_queue_tail(&card->hbpool.queue, hb);
      card->hbpool.count++;
   }
}

#endif /* NS_USE_DESTRUCTORS */


static void recycle_rx_buf(ns_dev *card, struct sk_buff *skb)
{
      struct ns_skb_cb *cb = NS_SKB_CB(skb);

      if (unlikely(cb->buf_type == BUF_NONE)) {
            printk("nicstar%d: What kind of rx buffer is this?\n", card->index);
            dev_kfree_skb_any(skb);
      } else
            push_rxbufs(card, skb);
}


static void recycle_iovec_rx_bufs(ns_dev *card, struct iovec *iov, int count)
{
      while (count-- > 0)
            recycle_rx_buf(card, (struct sk_buff *) (iov++)->iov_base);
}


static void recycle_iov_buf(ns_dev *card, struct sk_buff *iovb)
{
   if (card->iovpool.count < card->iovnr.max)
   {
      skb_queue_tail(&card->iovpool.queue, iovb);
      card->iovpool.count++;
   }
   else
      dev_kfree_skb_any(iovb);
}



static void dequeue_sm_buf(ns_dev *card, struct sk_buff *sb)
{
   skb_unlink(sb, &card->sbpool.queue);
#ifdef NS_USE_DESTRUCTORS
   if (card->sbfqc < card->sbnr.min)
#else
   if (card->sbfqc < card->sbnr.init)
   {
      struct sk_buff *new_sb;
      if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL)
      {
         NS_SKB_CB(new_sb)->buf_type = BUF_SM;
         skb_queue_tail(&card->sbpool.queue, new_sb);
         skb_reserve(new_sb, NS_AAL0_HEADER);
         push_rxbufs(card, new_sb);
      }
   }
   if (card->sbfqc < card->sbnr.init)
#endif /* NS_USE_DESTRUCTORS */
   {
      struct sk_buff *new_sb;
      if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL)
      {
         NS_SKB_CB(new_sb)->buf_type = BUF_SM;
         skb_queue_tail(&card->sbpool.queue, new_sb);
         skb_reserve(new_sb, NS_AAL0_HEADER);
         push_rxbufs(card, new_sb);
      }
   }
}



static void dequeue_lg_buf(ns_dev *card, struct sk_buff *lb)
{
   skb_unlink(lb, &card->lbpool.queue);
#ifdef NS_USE_DESTRUCTORS
   if (card->lbfqc < card->lbnr.min)
#else
   if (card->lbfqc < card->lbnr.init)
   {
      struct sk_buff *new_lb;
      if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL)
      {
         NS_SKB_CB(new_lb)->buf_type = BUF_LG;
         skb_queue_tail(&card->lbpool.queue, new_lb);
         skb_reserve(new_lb, NS_SMBUFSIZE);
         push_rxbufs(card, new_lb);
      }
   }
   if (card->lbfqc < card->lbnr.init)
#endif /* NS_USE_DESTRUCTORS */
   {
      struct sk_buff *new_lb;
      if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL)
      {
         NS_SKB_CB(new_lb)->buf_type = BUF_LG;
         skb_queue_tail(&card->lbpool.queue, new_lb);
         skb_reserve(new_lb, NS_SMBUFSIZE);
         push_rxbufs(card, new_lb);
      }
   }
}



static int ns_proc_read(struct atm_dev *dev, loff_t *pos, char *page)
{
   u32 stat;
   ns_dev *card;
   int left;

   left = (int) *pos;
   card = (ns_dev *) dev->dev_data;
   stat = readl(card->membase + STAT);
   if (!left--)
      return sprintf(page, "Pool   count    min   init    max \n");
   if (!left--)
      return sprintf(page, "Small  %5d  %5d  %5d  %5d \n",
                     ns_stat_sfbqc_get(stat), card->sbnr.min, card->sbnr.init,
                 card->sbnr.max);
   if (!left--)
      return sprintf(page, "Large  %5d  %5d  %5d  %5d \n",
                     ns_stat_lfbqc_get(stat), card->lbnr.min, card->lbnr.init,
                 card->lbnr.max);
   if (!left--)
      return sprintf(page, "Huge   %5d  %5d  %5d  %5d \n", card->hbpool.count,
                     card->hbnr.min, card->hbnr.init, card->hbnr.max);
   if (!left--)
      return sprintf(page, "Iovec  %5d  %5d  %5d  %5d \n", card->iovpool.count,
                     card->iovnr.min, card->iovnr.init, card->iovnr.max);
   if (!left--)
   {
      int retval;
      retval = sprintf(page, "Interrupt counter: %u \n", card->intcnt);
      card->intcnt = 0;
      return retval;
   }
#if 0
   /* Dump 25.6 Mbps PHY registers */
   /* Now there's a 25.6 Mbps PHY driver this code isn't needed. I left it
      here just in case it's needed for debugging. */
   if (card->max_pcr == ATM_25_PCR && !left--)
   {
      u32 phy_regs[4];
      u32 i;

      for (i = 0; i < 4; i++)
      {
         while (CMD_BUSY(card));
         writel(NS_CMD_READ_UTILITY | 0x00000200 | i, card->membase + CMD);
         while (CMD_BUSY(card));
         phy_regs[i] = readl(card->membase + DR0) & 0x000000FF;
      }

      return sprintf(page, "PHY regs: 0x%02X 0x%02X 0x%02X 0x%02X \n",
                     phy_regs[0], phy_regs[1], phy_regs[2], phy_regs[3]);
   }
#endif /* 0 - Dump 25.6 Mbps PHY registers */
#if 0
   /* Dump TST */
   if (left-- < NS_TST_NUM_ENTRIES)
   {
      if (card->tste2vc[left + 1] == NULL)
         return sprintf(page, "%5d - VBR/UBR \n", left + 1);
      else
         return sprintf(page, "%5d - %d %d \n", left + 1,
                        card->tste2vc[left + 1]->tx_vcc->vpi,
                        card->tste2vc[left + 1]->tx_vcc->vci);
   }
#endif /* 0 */
   return 0;
}



static int ns_ioctl(struct atm_dev *dev, unsigned int cmd, void __user *arg)
{
   ns_dev *card;
   pool_levels pl;
   long btype;
   unsigned long flags;

   card = dev->dev_data;
   switch (cmd)
   {
      case NS_GETPSTAT:
         if (get_user(pl.buftype, &((pool_levels __user *) arg)->buftype))
          return -EFAULT;
         switch (pl.buftype)
       {
          case NS_BUFTYPE_SMALL:
             pl.count = ns_stat_sfbqc_get(readl(card->membase + STAT));
             pl.level.min = card->sbnr.min;
             pl.level.init = card->sbnr.init;
             pl.level.max = card->sbnr.max;
             break;

          case NS_BUFTYPE_LARGE:
             pl.count = ns_stat_lfbqc_get(readl(card->membase + STAT));
             pl.level.min = card->lbnr.min;
             pl.level.init = card->lbnr.init;
             pl.level.max = card->lbnr.max;
             break;

          case NS_BUFTYPE_HUGE:
             pl.count = card->hbpool.count;
             pl.level.min = card->hbnr.min;
             pl.level.init = card->hbnr.init;
             pl.level.max = card->hbnr.max;
             break;

          case NS_BUFTYPE_IOVEC:
             pl.count = card->iovpool.count;
             pl.level.min = card->iovnr.min;
             pl.level.init = card->iovnr.init;
             pl.level.max = card->iovnr.max;
             break;

            default:
             return -ENOIOCTLCMD;

       }
         if (!copy_to_user((pool_levels __user *) arg, &pl, sizeof(pl)))
          return (sizeof(pl));
       else
          return -EFAULT;

      case NS_SETBUFLEV:
         if (!capable(CAP_NET_ADMIN))
          return -EPERM;
         if (copy_from_user(&pl, (pool_levels __user *) arg, sizeof(pl)))
          return -EFAULT;
       if (pl.level.min >= pl.level.init || pl.level.init >= pl.level.max)
          return -EINVAL;
       if (pl.level.min == 0)
          return -EINVAL;
         switch (pl.buftype)
       {
          case NS_BUFTYPE_SMALL:
               if (pl.level.max > TOP_SB)
                return -EINVAL;
             card->sbnr.min = pl.level.min;
             card->sbnr.init = pl.level.init;
             card->sbnr.max = pl.level.max;
             break;

          case NS_BUFTYPE_LARGE:
               if (pl.level.max > TOP_LB)
                return -EINVAL;
             card->lbnr.min = pl.level.min;
             card->lbnr.init = pl.level.init;
             card->lbnr.max = pl.level.max;
             break;

          case NS_BUFTYPE_HUGE:
               if (pl.level.max > TOP_HB)
                return -EINVAL;
             card->hbnr.min = pl.level.min;
             card->hbnr.init = pl.level.init;
             card->hbnr.max = pl.level.max;
             break;

          case NS_BUFTYPE_IOVEC:
               if (pl.level.max > TOP_IOVB)
                return -EINVAL;
             card->iovnr.min = pl.level.min;
             card->iovnr.init = pl.level.init;
             card->iovnr.max = pl.level.max;
             break;

            default:
             return -EINVAL;

         }   
         return 0;

      case NS_ADJBUFLEV:
         if (!capable(CAP_NET_ADMIN))
          return -EPERM;
         btype = (long) arg;  /* a long is the same size as a pointer or bigger */
         switch (btype)
       {
          case NS_BUFTYPE_SMALL:
             while (card->sbfqc < card->sbnr.init)
             {
                  struct sk_buff *sb;

                  sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
                  if (sb == NULL)
                     return -ENOMEM;
                  NS_SKB_CB(sb)->buf_type = BUF_SM;
                  skb_queue_tail(&card->sbpool.queue, sb);
                  skb_reserve(sb, NS_AAL0_HEADER);
                  push_rxbufs(card, sb);
             }
             break;

            case NS_BUFTYPE_LARGE:
             while (card->lbfqc < card->lbnr.init)
             {
                  struct sk_buff *lb;

                  lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
                  if (lb == NULL)
                     return -ENOMEM;
                  NS_SKB_CB(lb)->buf_type = BUF_LG;
                  skb_queue_tail(&card->lbpool.queue, lb);
                  skb_reserve(lb, NS_SMBUFSIZE);
                  push_rxbufs(card, lb);
             }
             break;

            case NS_BUFTYPE_HUGE:
               while (card->hbpool.count > card->hbnr.init)
             {
                  struct sk_buff *hb;

                  ns_grab_int_lock(card, flags);
              hb = skb_dequeue(&card->hbpool.queue);
              card->hbpool.count--;
                  spin_unlock_irqrestore(&card->int_lock, flags);
                  if (hb == NULL)
                 printk("nicstar%d: huge buffer count inconsistent.\n",
                        card->index);
                  else
                 dev_kfree_skb_any(hb);
              
             }
               while (card->hbpool.count < card->hbnr.init)
               {
                  struct sk_buff *hb;

                  hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
                  if (hb == NULL)
                     return -ENOMEM;
                  NS_SKB_CB(hb)->buf_type = BUF_NONE;
                  ns_grab_int_lock(card, flags);
                  skb_queue_tail(&card->hbpool.queue, hb);
                  card->hbpool.count++;
                  spin_unlock_irqrestore(&card->int_lock, flags);
               }
             break;

            case NS_BUFTYPE_IOVEC:
             while (card->iovpool.count > card->iovnr.init)
             {
                struct sk_buff *iovb;

                  ns_grab_int_lock(card, flags);
              iovb = skb_dequeue(&card->iovpool.queue);
              card->iovpool.count--;
                  spin_unlock_irqrestore(&card->int_lock, flags);
                  if (iovb == NULL)
                 printk("nicstar%d: iovec buffer count inconsistent.\n",
                        card->index);
                  else
                 dev_kfree_skb_any(iovb);

             }
               while (card->iovpool.count < card->iovnr.init)
             {
                struct sk_buff *iovb;

                  iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
                  if (iovb == NULL)
                     return -ENOMEM;
                  NS_SKB_CB(iovb)->buf_type = BUF_NONE;
                  ns_grab_int_lock(card, flags);
                  skb_queue_tail(&card->iovpool.queue, iovb);
                  card->iovpool.count++;
                  spin_unlock_irqrestore(&card->int_lock, flags);
             }
             break;

            default:
             return -EINVAL;

       }
         return 0;

      default:
         if (dev->phy && dev->phy->ioctl) {
            return dev->phy->ioctl(dev, cmd, arg);
         }
         else {
            printk("nicstar%d: %s == NULL \n", card->index,
                   dev->phy ? "dev->phy->ioctl" : "dev->phy");
            return -ENOIOCTLCMD;
         }
   }
}


static void which_list(ns_dev *card, struct sk_buff *skb)
{
      printk("skb buf_type: 0x%08x\n", NS_SKB_CB(skb)->buf_type);
}


static void ns_poll(unsigned long arg)
{
   int i;
   ns_dev *card;
   unsigned long flags;
   u32 stat_r, stat_w;

   PRINTK("nicstar: Entering ns_poll().\n");
   for (i = 0; i < num_cards; i++)
   {
      card = cards[i];
      if (spin_is_locked(&card->int_lock)) {
      /* Probably it isn't worth spinning */
         continue;
      }
      ns_grab_int_lock(card, flags);

      stat_w = 0;
      stat_r = readl(card->membase + STAT);
      if (stat_r & NS_STAT_TSIF)
         stat_w |= NS_STAT_TSIF;
      if (stat_r & NS_STAT_EOPDU)
         stat_w |= NS_STAT_EOPDU;

      process_tsq(card);
      process_rsq(card);

      writel(stat_w, card->membase + STAT);
      spin_unlock_irqrestore(&card->int_lock, flags);
   }
   mod_timer(&ns_timer, jiffies + NS_POLL_PERIOD);
   PRINTK("nicstar: Leaving ns_poll().\n");
}



static int ns_parse_mac(char *mac, unsigned char *esi)
{
   int i, j;
   short byte1, byte0;

   if (mac == NULL || esi == NULL)
      return -1;
   j = 0;
   for (i = 0; i < 6; i++)
   {
      if ((byte1 = ns_h2i(mac[j++])) < 0)
         return -1;
      if ((byte0 = ns_h2i(mac[j++])) < 0)
         return -1;
      esi[i] = (unsigned char) (byte1 * 16 + byte0);
      if (i < 5)
      {
         if (mac[j++] != ':')
            return -1;
      }
   }
   return 0;
}



static short ns_h2i(char c)
{
   if (c >= '0' && c <= '9')
      return (short) (c - '0');
   if (c >= 'A' && c <= 'F')
      return (short) (c - 'A' + 10);
   if (c >= 'a' && c <= 'f')
      return (short) (c - 'a' + 10);
   return -1;
}



static void ns_phy_put(struct atm_dev *dev, unsigned char value,
                    unsigned long addr)
{
   ns_dev *card;
   unsigned long flags;

   card = dev->dev_data;
   ns_grab_res_lock(card, flags);
   while(CMD_BUSY(card));
   writel((unsigned long) value, card->membase + DR0);
   writel(NS_CMD_WRITE_UTILITY | 0x00000200 | (addr & 0x000000FF),
          card->membase + CMD);
   spin_unlock_irqrestore(&card->res_lock, flags);
}



static unsigned char ns_phy_get(struct atm_dev *dev, unsigned long addr)
{
   ns_dev *card;
   unsigned long flags;
   unsigned long data;

   card = dev->dev_data;
   ns_grab_res_lock(card, flags);
   while(CMD_BUSY(card));
   writel(NS_CMD_READ_UTILITY | 0x00000200 | (addr & 0x000000FF),
          card->membase + CMD);
   while(CMD_BUSY(card));
   data = readl(card->membase + DR0) & 0x000000FF;
   spin_unlock_irqrestore(&card->res_lock, flags);
   return (unsigned char) data;
}



module_init(nicstar_init);
module_exit(nicstar_cleanup);

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