Merge with 2.3.19.

1 files changed, 3060 insertions, 0 deletions

diff --git a/drivers/atm/nicstar.c b/drivers/atm/nicstar.c
new file mode 100644
index 000000000..97c768ace
--- /dev/null
+++ b/drivers/atm/nicstar.c
@@ -0,0 +1,3060 @@
+/******************************************************************************
+ *
+ * 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
+ *
+ *
+ ******************************************************************************/
+
+
+/* Header files ***************************************************************/
+
+#include <linux/module.h>
+#include <linux/config.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 <asm/io.h>
+#include <asm/uaccess.h>
+#include "nicstar.h"
+#include "nicstarmac.h"
+#ifdef CONFIG_ATM_NICSTAR_USE_SUNI
+#include "suni.h"
+#endif /* CONFIG_ATM_NICSTAR_USE_SUNI */
+
+
+/* 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 MAX(a,b) ((a) > (b) ? (a) : (b))
+#define MIN(a,b) ((a) < (b) ? (a) : (b))
+
+#define CMD_BUSY(card) (readl((card)->membase + STAT) & NS_STAT_CMDBZ)
+
+#define NS_DELAY mdelay(1)
+
+#define ALIGN_ADDRESS(addr, alignment) \
+        ((((u32) (addr)) + (((u32) (alignment)) - 1)) & ~(((u32) (alignment)) - 1))
+
+#undef CEIL(d)
+
+#ifndef ATM_SKB
+#define ATM_SKB(s) (&(s)->atm)
+#endif
+
+
+/* Version definition *********************************************************/
+/*
+#include <linux/version.h>
+char kernel_version[] = UTS_RELEASE;
+*/
+
+/* 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 ns_init_card(int i, struct pci_dev *pcidev);
+static void 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 *card, u32 type, u32 handle1, u32 addr1,
+                       u32 handle2, u32 addr2);
+static void ns_irq_handler(int irq, void *dev_id, struct pt_regs *regs);
+static int ns_open(struct atm_vcc *vcc, short vpi, int vci);
+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 *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 = 0;
+static struct atmdev_ops atm_ops =
+{
+   NULL,		/* dev_close */
+   ns_open,		/* open */
+   ns_close,		/* close */
+   ns_ioctl,		/* ioctl */
+   NULL,		/* getsockopt */
+   NULL,		/* setsockopt */
+   ns_send,		/* send */
+   NULL,		/* sg_send */
+   NULL,		/* send_oam */
+   ns_phy_put,		/* phy_put */
+   ns_phy_get,		/* phy_get */
+   NULL,		/* feedback */
+   NULL,		/* change_qos */
+   NULL,		/* free_rx_skb */
+   ns_proc_read		/* proc_read */
+};
+static struct timer_list ns_timer;
+static char *mac[NS_MAX_CARDS] = { NULL
+#if NS_MAX_CARDS > 1
+                                 , NULL
+#endif /* NS_MAX_CARDS > 1 */
+#if NS_MAX_CARDS > 2
+                                 , NULL
+#endif /* NS_MAX_CARDS > 2 */
+#if NS_MAX_CARDS > 3
+                                 , NULL
+#endif /* NS_MAX_CARDS > 3 */
+#if NS_MAX_CARDS > 4
+                                 , NULL
+#endif /* NS_MAX_CARDS > 4 */
+                                        };
+
+#ifdef MODULE
+MODULE_PARM(mac, "1-" __MODULE_STRING(NS_MAX_CARDS) "s");
+#endif /* MODULE */
+
+
+/* Functions*******************************************************************/
+
+#ifdef MODULE
+
+int init_module(void)
+{
+   int i;
+   unsigned error = 0;	/* Initialized to remove compile warning */
+   struct pci_dev *pcidev;
+
+   XPRINTK("nicstar: init_module() called.\n");
+   if(!pci_present())
+   {
+      printk("nicstar: no PCI subsystem found.\n");
+      return -EIO;
+   }
+
+   for(i = 0; i < NS_MAX_CARDS; i++)
+      cards[i] = NULL;
+
+   pcidev = NULL;
+   for(i = 0; i < NS_MAX_CARDS; i++)
+   {
+      if ((pcidev = pci_find_device(PCI_VENDOR_ID_IDT,
+                                    PCI_DEVICE_ID_IDT_IDT77201,
+                                    pcidev)) == NULL)
+         break;
+
+      error = ns_init_card(i, pcidev);
+      if (error)
+         cards[i--] = NULL;	/* Try to find another card but don't increment index */
+   }
+
+   if (i == 0)
+   {
+      if (!error)
+      {
+         printk("nicstar: no cards found.\n");
+         return -ENXIO;
+      }
+      else
+         return -EIO;
+   }
+   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: init_module() returned.\n");
+
+   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 0;
+}
+
+
+
+void cleanup_module(void)
+{
+   int i, j;
+   unsigned short pci_command;
+   ns_dev *card;
+   struct sk_buff *hb;
+   struct sk_buff *iovb;
+   struct sk_buff *lb;
+   struct sk_buff *sb;
+   
+   XPRINTK("nicstar: cleanup_module() called.\n");
+
+   if (MOD_IN_USE)
+      printk("nicstar: module in use, remove delayed.\n");
+
+   del_timer(&ns_timer);
+
+   for (i = 0; i < NS_MAX_CARDS; i++)
+   {
+      if (cards[i] == NULL)
+         continue;
+
+      card = cards[i];
+
+      /* Stop everything */
+      writel(0x00000000, card->membase + CFG);
+
+      /* De-register device */
+      atm_dev_deregister(card->atmdev);
+
+      /* Disable memory mapping and busmastering */
+      if (pci_read_config_word(card->pcidev, PCI_COMMAND, &pci_command) != 0)
+      {
+         printk("nicstar%d: can't read PCI_COMMAND.\n", i);
+      }
+      pci_command &= ~(PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
+      if (pci_write_config_word(card->pcidev, PCI_COMMAND, pci_command) != 0)
+      {
+         printk("nicstar%d: can't write PCI_COMMAND.\n", i);
+      }
+      
+      /* 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)
+      {
+         kfree_skb(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)
+      {
+         kfree_skb(iovb);
+         j++;
+      }
+      PRINTK("nicstar%d: %d iovec buffers freed.\n", i, j);
+      while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
+         kfree_skb(lb);
+      while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
+         kfree_skb(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((void *) card->membase);
+      kfree(card);
+      
+   }
+   XPRINTK("nicstar: cleanup_module() returned.\n");
+}
+
+
+#else
+
+int __init nicstar_detect(void)
+{
+   int i;
+   unsigned error = 0;	/* Initialized to remove compile warning */
+   struct pci_dev *pcidev;
+
+   if(!pci_present())
+   {
+      printk("nicstar: no PCI subsystem found.\n");
+      return -EIO;
+   }
+
+   for(i = 0; i < NS_MAX_CARDS; i++)
+      cards[i] = NULL;
+
+   pcidev = NULL;
+   for(i = 0; i < NS_MAX_CARDS; i++)
+   {
+      if ((pcidev = pci_find_device(PCI_VENDOR_ID_IDT,
+                                    PCI_DEVICE_ID_IDT_IDT77201,
+                                    pcidev)) == NULL)
+         break;
+
+      error = ns_init_card(i, pcidev);
+      if (error)
+         cards[i--] = NULL;	/* Try to find another card but don't increment index */
+   }
+
+   if (i == 0 && error)
+      return -EIO;
+
+   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: init_module() returned.\n");
+
+   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 i;
+}
+
+
+#endif /* MODULE */
+
+
+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 */
+   save_flags(flags); cli();
+   while (CMD_BUSY(card));
+   writel(sram_address, card->membase + CMD);
+   while (CMD_BUSY(card));
+   data = readl(card->membase + DR0);
+   restore_flags(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 */
+   save_flags(flags); cli();
+   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);
+   restore_flags(flags);
+}
+
+
+static int ns_init_card(int i, struct pci_dev *pcidev)
+{
+   int j;
+   struct ns_dev *card;
+   unsigned short pci_command;
+   unsigned char pci_latency;
+   unsigned error;
+   u32 data;
+   u32 u32d[4];
+   u32 ns_cfg_rctsize;
+   int bcount;
+
+   error = 0;
+
+   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;
+      
+   card->index = i;
+   card->pcidev = pcidev;
+   card->membase = (u32) pcidev->resource[1].start;
+#ifdef __powerpc__
+   /* Compensate for different memory map between host CPU and PCI bus.
+      Shouldn't we use a macro for this? */
+   card->membase += KERNELBASE;
+#endif /* __powerpc__ */
+   card->membase = (u32) ioremap(card->membase, NS_IOREMAP_SIZE);
+   if (card->membase == (u32) (NULL))
+   {
+      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);
+
+   if (pci_read_config_word(pcidev, PCI_COMMAND, &pci_command) != 0)
+   {
+      printk("nicstar%d: can't read PCI_COMMAND.\n", i);
+      error = 4;
+      ns_init_card_error(card, error);
+      return error;
+   }
+   pci_command |= (PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
+   if (pci_write_config_word(pcidev, PCI_COMMAND, pci_command) != 0)
+   {
+      printk("nicstar%d: can't write PCI_COMMAND.\n", i);
+      error = 5;
+      ns_init_card_error(card, error);
+      return error;
+   }
+
+   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;
+   }
+   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;
+      }
+   }
+      
+   /* 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 = IDT_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);
+
+   if (request_irq(pcidev->irq, &ns_irq_handler, SA_INTERRUPT | SA_SHIRQ, "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;
+   }
+
+   /* 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 = (scq_info *) NULL;
+   card->scq2 = (scq_info *) NULL;
+   card->scq0 = get_scq(VBR_SCQSIZE, NS_VRSCD0);
+   if (card->scq0 == (scq_info *) 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 = 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;
+      }
+      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 = 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;
+      }
+      skb_queue_tail(&card->lbpool.queue, lb);
+      skb_reserve(lb, NS_SMBUFSIZE);
+      push_rxbufs(card, BUF_LG, (u32) lb, (u32) virt_to_bus(lb->data), 0, 0);
+      /* 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 = 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;
+      }
+      skb_queue_tail(&card->sbpool.queue, sb);
+      skb_reserve(sb, NS_AAL0_HEADER);
+      push_rxbufs(card, BUF_SM, (u32) sb, (u32) virt_to_bus(sb->data), 0, 0);
+   }
+   /* 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;
+      }
+      skb_queue_tail(&card->iovpool.queue, iovb);
+      card->iovpool.count++;
+   }
+
+
+   card->in_handler = 0;
+   card->in_poll = 0;
+   card->intcnt = 0;
+
+   /* 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;
+
+   /* Register device */
+   card->atmdev = atm_dev_register("nicstar", &atm_ops, -1, 0UL);
+   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);
+
+   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);
+#ifdef MODULE
+      MOD_INC_USE_COUNT;
+      /* Can't remove the nicstar driver or the suni driver would oops */
+#endif /* MODULE */
+   }
+#endif /* CONFIG_ATM_NICSTAR_USE_SUNI */
+   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 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)
+         kfree_skb(iovb);
+   }
+   if (error >= 15)
+   {
+      struct sk_buff *sb;
+      while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
+         kfree_skb(sb);
+      free_scq(card->scq0, NULL);
+   }
+   if (error >= 14)
+   {
+      struct sk_buff *lb;
+      while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
+         kfree_skb(lb);
+   }
+   if (error >= 13)
+   {
+      struct sk_buff *hb;
+      while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL)
+         kfree_skb(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((void *) card->membase);
+   }
+   if (error >= 3)
+   {
+      kfree(card);
+   }
+}
+
+
+
+static scq_info *get_scq(int size, u32 scd)
+{
+   scq_info *scq;
+   int i;
+
+   if (size != VBR_SCQSIZE && size != CBR_SCQSIZE)
+      return (scq_info *) NULL;
+
+   scq = (scq_info *) kmalloc(sizeof(scq_info), GFP_KERNEL);
+   if (scq == (scq_info *) NULL)
+      return (scq_info *) NULL;
+   scq->org = kmalloc(2 * size, GFP_KERNEL);
+   if (scq->org == NULL)
+   {
+      kfree(scq);
+      return (scq_info *) NULL;
+   }
+   scq->skb = (struct sk_buff **) kmalloc(sizeof(struct sk_buff *) *
+                                          (size / NS_SCQE_SIZE), GFP_KERNEL);
+   if (scq->skb == (struct sk_buff **) NULL)
+   {
+      kfree(scq->org);
+      kfree(scq);
+      return (scq_info *) 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;
+
+   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(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(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(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, u32 type, u32 handle1, u32 addr1,
+                       u32 handle2, u32 addr2)
+{
+   u32 stat;
+   unsigned long flags;
+   
+
+#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 (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 /* 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 (type == BUF_SM)
+      {
+         if (card->sbfqc >= card->sbnr.max)
+         {
+            skb_unlink((struct sk_buff *) handle1);
+            kfree_skb((struct sk_buff *) handle1);
+            skb_unlink((struct sk_buff *) handle2);
+            kfree_skb((struct sk_buff *) handle2);
+            return;
+         }
+	 else
+            card->sbfqc += 2;
+      }
+      else /* (type == BUF_LG) */
+      {
+         if (card->lbfqc >= card->lbnr.max)
+         {
+            skb_unlink((struct sk_buff *) handle1);
+            kfree_skb((struct sk_buff *) handle1);
+            skb_unlink((struct sk_buff *) handle2);
+            kfree_skb((struct sk_buff *) handle2);
+            return;
+         }
+         else
+            card->lbfqc += 2;
+      }
+
+      save_flags(flags); cli();
+
+      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 | (u32) type, card->membase + CMD);
+ 
+      restore_flags(flags);
+
+      XPRINTK("nicstar%d: Pushing %s buffers at 0x%x and 0x%x.\n", card->index,
+              (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 void ns_irq_handler(int irq, void *dev_id, struct pt_regs *regs)
+{
+   u32 stat_r;
+   ns_dev *card;
+   struct atm_dev *dev;
+
+   card = (ns_dev *) dev_id;
+   dev = card->atmdev;
+   card->intcnt++;
+
+   PRINTK("nicstar%d: NICStAR generated an interrupt\n", card->index);
+
+   if (card->in_handler)
+   {
+      printk("nicstar%d: Re-entering ns_irq_handler()???\n", card->index);
+      return;
+   }
+   card->in_handler = 1;
+   if (card->in_poll)
+   {
+      card->in_handler = 0;
+      printk("nicstar%d: Called irq handler while in ns_poll()!?\n",
+             card->index);
+      return;
+   }
+   
+   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 untill 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 = alloc_skb(NS_SMSKBSIZE, GFP_ATOMIC);
+         if (sb == NULL)
+         {
+            writel(readl(card->membase + CFG) & ~NS_CFG_EFBIE, card->membase + CFG);
+            card->efbie = 0;
+            break;
+         }
+         skb_queue_tail(&card->sbpool.queue, sb);
+         skb_reserve(sb, NS_AAL0_HEADER);
+         push_rxbufs(card, BUF_SM, (u32) sb, (u32) virt_to_bus(sb->data), 0, 0);
+      }
+      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 = alloc_skb(NS_LGSKBSIZE, GFP_ATOMIC);
+         if (lb == NULL)
+         {
+            writel(readl(card->membase + CFG) & ~NS_CFG_EFBIE, card->membase + CFG);
+            card->efbie = 0;
+            break;
+         }
+         skb_queue_tail(&card->lbpool.queue, lb);
+         skb_reserve(lb, NS_SMBUFSIZE);
+         push_rxbufs(card, BUF_LG, (u32) lb, (u32) virt_to_bus(lb->data), 0, 0);
+      }
+      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);
+   }
+   
+   card->in_handler = 0;
+   PRINTK("nicstar%d: end of interrupt service\n", card->index);
+}
+
+
+
+static int ns_open(struct atm_vcc *vcc, short vpi, int vci)
+{
+   ns_dev *card;
+   vc_map *vc;
+   int error;
+   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 */
+
+   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;
+   }
+
+   if ((error = atm_find_ci(vcc, &vpi, &vci)))
+   {
+      PRINTK("nicstar%d: error in atm_find_ci().\n", card->index);
+      return error;
+   }
+   vc = &(card->vcmap[vpi << card->vcibits | vci]);
+   vcc->vpi = vpi;
+   vcc->vci = 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;
+   }
+
+   vcc->flags |= ATM_VF_ADDR;
+
+   /* 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 (!(vcc->flags & ATM_VF_PARTIAL))
+   {
+      scq_info *scq;
+      
+      vcc->flags |= ATM_VF_PARTIAL;
+      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);
+            vcc->flags &= ~(ATM_VF_ADDR | ATM_VF_PARTIAL);
+            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);
+	       vcc->flags &= ~(ATM_VF_ADDR | ATM_VF_PARTIAL);
+               return -EINVAL;
+            }
+         }
+
+         if (n == 0)
+         {
+            printk("nicstar%d: selected bandwidth < granularity.\n", card->index);
+            vcc->flags &= ~(ATM_VF_ADDR | ATM_VF_PARTIAL);
+            return -EINVAL;
+         }
+
+         if (n > (card->tst_free_entries - NS_TST_RESERVED))
+         {
+            PRINTK("nicstar%d: not enough free CBR bandwidth.\n", card->index);
+	    vcc->flags &= ~(ATM_VF_ADDR | ATM_VF_PARTIAL);
+            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;
+            vcc->flags &= ~(ATM_VF_ADDR | ATM_VF_PARTIAL);
+	    return -EBUSY;
+         }
+
+         vc->cbr_scd = NS_FRSCD + frscdi * NS_FRSCD_SIZE;
+
+         scq = get_scq(CBR_SCQSIZE, vc->cbr_scd);
+         if (scq == (scq_info *) NULL)
+         {
+            PRINTK("nicstar%d: can't get fixed rate SCQ.\n", card->index);
+            card->scd2vc[frscdi] = NULL;
+            card->tst_free_entries += n;
+            vcc->flags &= ~(ATM_VF_ADDR | ATM_VF_PARTIAL);
+            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 /* not CBR */
+      {
+         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);
+      }
+      
+   }
+   
+   vcc->flags |= ATM_VF_READY;
+   MOD_INC_USE_COUNT;
+   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);
+
+   vcc->flags &= ~(ATM_VF_READY);
+   
+   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;
+      save_flags(flags); cli();
+      while(CMD_BUSY(card));
+      writel(NS_CMD_CLOSE_CONNECTION | addr << 2, card->membase + CMD);
+      restore_flags(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,
+	                       ATM_SKB(iovb)->iovcnt);
+         ATM_SKB(iovb)->iovcnt = 0;
+         ATM_SKB(iovb)->vcc = NULL;
+         save_flags(flags); cli();
+         recycle_iov_buf(card, iovb);
+         restore_flags(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 (;;)
+      {
+         save_flags(flags); cli();
+         scqep = scq->next;
+         if (scqep == scq->base)
+            scqep = scq->last;
+         else
+            scqep--;
+         if (scqep == scq->tail)
+         {
+            restore_flags(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);
+         }
+         schedule();
+         restore_flags(flags);
+      }
+
+      /* 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);
+   }
+
+   vcc->dev_data = NULL;
+   vcc->flags &= ~(ATM_VF_PARTIAL | ATM_VF_ADDR);
+   MOD_DEC_USE_COUNT;
+
+#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);
+      vcc->stats->tx_err++;
+      dev_kfree_skb(skb);
+      return -EINVAL;
+   }
+   
+   if (!vc->tx)
+   {
+      printk("nicstar%d: Trying to transmit on a non-tx VC.\n", card->index);
+      vcc->stats->tx_err++;
+      dev_kfree_skb(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);
+      vcc->stats->tx_err++;
+      dev_kfree_skb(skb);
+      return -EINVAL;
+   }
+   
+   if (ATM_SKB(skb)->iovcnt != 0)
+   {
+      printk("nicstar%d: No scatter-gather yet.\n", card->index);
+      vcc->stats->tx_err++;
+      dev_kfree_skb(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 = cpu_to_le32(((u32) vcc->vpi) << NS_TBD_VPI_SHIFT |
+                                ((u32) vcc->vci) << NS_TBD_VCI_SHIFT);
+      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)
+   {
+      vcc->stats->tx_err++;
+      dev_kfree_skb(skb);
+      return -EIO;
+   }
+   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;
+   
+   if (scq->tail == scq->next)
+   {
+      if (in_interrupt()) {
+         printk("nicstar%d: Error pushing TBD.\n", card->index);
+         return 1;
+      }
+
+      save_flags(flags); cli();
+      scq->full = 1;
+      interruptible_sleep_on_timeout(&scq->scqfull_waitq, SCQFULL_TIMEOUT);
+      restore_flags(flags);
+
+      if (scq->full) {
+         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)
+   {
+      if (scq->tail == scq->next)
+      {
+         if (in_interrupt()) {
+            data = (u32) virt_to_bus(scq->next);
+            ns_write_sram(card, scq->scd, &data, 1);
+            printk("nicstar%d: Error pushing TSR.\n", card->index);
+            return 0;
+         }
+
+         save_flags(flags); cli();
+         scq->full = 1;
+         interruptible_sleep_on_timeout(&scq->scqfull_waitq, SCQFULL_TIMEOUT);
+         restore_flags(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);
+   
+   return 0;
+}
+
+
+
+static void process_tsq(ns_dev *card)
+{
+   u32 scdi;
+   scq_info *scq;
+   ns_tsi *previous, *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;
+   
+   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;
+   }
+
+   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->pop != NULL)
+	    vcc->pop(vcc, skb);
+	 else
+	    dev_kfree_skb(skb);
+	 scq->skb[i] = NULL;
+      }
+      if (++i == scq->num_entries)
+         i = 0;
+   }
+   scq->tail = scq->base + pos;
+}
+
+
+
+static void process_rsq(ns_dev *card)
+{
+   ns_rsqe *previous;
+
+   if (!ns_rsqe_valid(card->rsq.next))
+      return;
+   while (ns_rsqe_valid(card->rsq.next))
+   {
+      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++;
+   }
+   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 = alloc_skb(NS_SMSKBSIZE, GFP_ATOMIC)) == NULL)
+         {
+            printk("nicstar%d: Can't allocate buffers for aal0.\n",
+                   card->index);
+            vcc->stats->rx_drop += i;
+            break;
+         }
+         if (!atm_charge(vcc, sb->truesize))
+         {
+            RXPRINTK("nicstar%d: atm_charge() dropped aal0 packets.\n",
+                     card->index);
+            vcc->stats->rx_drop += i - 1;	/* already increased by 1 */
+            kfree_skb(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(sb->tail, cell, ATM_CELL_PAYLOAD);
+         skb_put(sb, ATM_CELL_PAYLOAD);
+         ATM_SKB(sb)->vcc = vcc;
+         sb->stamp = xtime;
+         vcc->push(vcc, sb);
+         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);
+            vcc->stats->rx_drop++;
+            recycle_rx_buf(card, skb);
+            return;
+	 }
+      }
+      else
+         if (--card->iovpool.count < card->iovnr.min)
+	 {
+	    struct sk_buff *new_iovb;
+	    if ((new_iovb = alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC)) != NULL)
+	    {
+               skb_queue_tail(&card->iovpool.queue, new_iovb);
+               card->iovpool.count++;
+	    }
+	 }
+      vc->rx_iov = iovb;
+      ATM_SKB(iovb)->iovcnt = 0;
+      iovb->len = 0;
+      iovb->tail = iovb->data = iovb->head;
+      ATM_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 (ATM_SKB(iovb)->iovcnt >= NS_MAX_IOVECS)
+   {
+      printk("nicstar%d: received too big AAL5 SDU.\n", card->index);
+      vcc->stats->rx_err++;
+      recycle_iovec_rx_bufs(card, (struct iovec *) iovb->data, NS_MAX_IOVECS);
+      ATM_SKB(iovb)->iovcnt = 0;
+      iovb->len = 0;
+      iovb->tail = iovb->data = iovb->head;
+      ATM_SKB(iovb)->vcc = vcc;
+   }
+   iov = &((struct iovec *) iovb->data)[ATM_SKB(iovb)->iovcnt++];
+   iov->iov_base = (void *) skb;
+   iov->iov_len = ns_rsqe_cellcount(rsqe) * 48;
+   iovb->len += iov->iov_len;
+
+   if (ATM_SKB(iovb)->iovcnt == 1)
+   {
+      if (skb->list != &card->sbpool.queue)
+      {
+         printk("nicstar%d: Expected a small buffer, and this is not one.\n",
+	        card->index);
+         which_list(card, skb);
+         vcc->stats->rx_err++;
+         recycle_rx_buf(card, skb);
+         vc->rx_iov = NULL;
+         recycle_iov_buf(card, iovb);
+         return;
+      }
+   }
+   else /* ATM_SKB(iovb)->iovcnt >= 2 */
+   {
+      if (skb->list != &card->lbpool.queue)
+      {
+         printk("nicstar%d: Expected a large buffer, and this is not one.\n",
+	        card->index);
+         which_list(card, skb);
+         vcc->stats->rx_err++;
+         recycle_iovec_rx_bufs(card, (struct iovec *) iovb->data,
+	                       ATM_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");
+         vcc->stats->rx_err++;
+         recycle_iovec_rx_bufs(card, (struct iovec *) iovb->data,
+	   ATM_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 (ATM_SKB(iovb)->iovcnt == 1)	/* Just a small buffer */
+      {
+         /* skb points to a small buffer */
+         if (!atm_charge(vcc, skb->truesize))
+         {
+            push_rxbufs(card, BUF_SM, (u32) skb, (u32) virt_to_bus(skb->data),
+                        0, 0);
+         }
+         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;
+            skb->stamp = xtime;
+            vcc->push(vcc, skb);
+            vcc->stats->rx++;
+         }
+      }
+      else if (ATM_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, BUF_SM, (u32) sb, (u32) virt_to_bus(sb->data),
+                           0, 0);
+            }
+            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;
+               sb->stamp = xtime;
+               vcc->push(vcc, sb);
+               vcc->stats->rx++;
+            }
+
+            push_rxbufs(card, BUF_LG, (u32) skb,
+	                   (u32) virt_to_bus(skb->data), 0, 0);
+
+	 }
+	 else			/* len > NS_SMBUFSIZE, the usual case */
+	 {
+            if (!atm_charge(vcc, skb->truesize))
+            {
+               push_rxbufs(card, BUF_LG, (u32) skb,
+                           (u32) virt_to_bus(skb->data), 0, 0);
+            }
+            else
+            {
+               dequeue_lg_buf(card, skb);
+#ifdef NS_USE_DESTRUCTORS
+               skb->destructor = ns_lb_destructor;
+#endif /* NS_USE_DESTRUCTORS */
+               skb_push(skb, NS_SMBUFSIZE);
+               memcpy(skb->data, sb->data, NS_SMBUFSIZE);
+               skb_put(skb, len - NS_SMBUFSIZE);
+               ATM_SKB(skb)->vcc = vcc;
+               skb->stamp = xtime;
+               vcc->push(vcc, skb);
+               vcc->stats->rx++;
+            }
+
+            push_rxbufs(card, BUF_SM, (u32) sb, (u32) virt_to_bus(sb->data),
+                        0, 0);
+
+         }
+	 
+      }
+      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 = alloc_skb(NS_HBUFSIZE, GFP_ATOMIC);
+            if (hb == NULL)
+            {
+               printk("nicstar%d: Out of huge buffers.\n", card->index);
+               vcc->stats->rx_drop++;
+               recycle_iovec_rx_bufs(card, (struct iovec *) iovb->data,
+	                             ATM_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 = alloc_skb(NS_HBUFSIZE, GFP_ATOMIC)) != NULL)
+               {
+                  skb_queue_tail(&card->hbpool.queue, new_hb);
+                  card->hbpool.count++;
+               }
+            }
+	 }
+	 else
+         if (--card->hbpool.count < card->hbnr.min)
+         {
+            struct sk_buff *new_hb;
+            if ((new_hb = alloc_skb(NS_HBUFSIZE, GFP_ATOMIC)) != NULL)
+            {
+               skb_queue_tail(&card->hbpool.queue, new_hb);
+               card->hbpool.count++;
+            }
+            if (card->hbpool.count < card->hbnr.min)
+	    {
+               if ((new_hb = alloc_skb(NS_HBUFSIZE, GFP_ATOMIC)) != NULL)
+               {
+                  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, ATM_SKB(iovb)->iovcnt);
+            if (card->hbpool.count < card->hbnr.max)
+            {
+               skb_queue_tail(&card->hbpool.queue, hb);
+               card->hbpool.count++;
+            }
+	    else
+	       kfree_skb(hb);
+         }
+         else
+	 {
+            /* Copy the small buffer to the huge buffer */
+            sb = (struct sk_buff *) iov->iov_base;
+            memcpy(hb->data, sb->data, iov->iov_len);
+            skb_put(hb, iov->iov_len);
+            remaining = len - iov->iov_len;
+            iov++;
+            /* Free the small buffer */
+            push_rxbufs(card, BUF_SM, (u32) sb, (u32) virt_to_bus(sb->data),
+                        0, 0);
+
+            /* Copy all large buffers to the huge buffer and free them */
+            for (j = 1; j < ATM_SKB(iovb)->iovcnt; j++)
+            {
+               lb = (struct sk_buff *) iov->iov_base;
+               tocopy = MIN(remaining, iov->iov_len);
+               memcpy(hb->tail, lb->data, tocopy);
+               skb_put(hb, tocopy);
+               iov++;
+               remaining -= tocopy;
+               push_rxbufs(card, BUF_LG, (u32) lb,
+                           (u32) virt_to_bus(lb->data), 0, 0);
+            }
+#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 */
+            hb->stamp = xtime;
+            vcc->push(vcc, hb);
+            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 = alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
+      if (sb == NULL)
+         break;
+      skb_queue_tail(&card->sbpool.queue, sb);
+      skb_reserve(sb, NS_AAL0_HEADER);
+      push_rxbufs(card, BUF_SM, (u32) sb, (u32) virt_to_bus(sb->data), 0, 0);
+   } 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 = alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
+      if (lb == NULL)
+         break;
+      skb_queue_tail(&card->lbpool.queue, lb);
+      skb_reserve(lb, NS_SMBUFSIZE);
+      push_rxbufs(card, BUF_LG, (u32) lb, (u32) virt_to_bus(lb->data), 0, 0);
+   } 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 = alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
+      if (hb == NULL)
+         break;
+      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)
+{
+   if (skb->list == &card->sbpool.queue)
+      push_rxbufs(card, BUF_SM, (u32) skb, (u32) virt_to_bus(skb->data), 0, 0);
+   else if (skb->list == &card->lbpool.queue)
+      push_rxbufs(card, BUF_LG, (u32) skb, (u32) virt_to_bus(skb->data), 0, 0);
+   else
+   {
+      printk("nicstar%d: What kind of rx buffer is this?\n", card->index);
+      kfree_skb(skb);
+   }
+}
+
+
+
+static void recycle_iovec_rx_bufs(ns_dev *card, struct iovec *iov, int count)
+{
+   struct sk_buff *skb;
+
+   for (; count > 0; count--)
+   {
+      skb = (struct sk_buff *) (iov++)->iov_base;
+      if (skb->list == &card->sbpool.queue)
+         push_rxbufs(card, BUF_SM, (u32) skb, (u32) virt_to_bus(skb->data),
+	             0, 0);
+      else if (skb->list == &card->lbpool.queue)
+         push_rxbufs(card, BUF_LG, (u32) skb, (u32) virt_to_bus(skb->data),
+	             0, 0);
+      else
+      {
+         printk("nicstar%d: What kind of rx buffer is this?\n", card->index);
+         kfree_skb(skb);
+      }
+   }
+}
+
+
+
+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
+      kfree_skb(iovb);
+}
+
+
+
+static void dequeue_sm_buf(ns_dev *card, struct sk_buff *sb)
+{
+   skb_unlink(sb);
+#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 = alloc_skb(NS_SMSKBSIZE, GFP_ATOMIC)) != NULL)
+      {
+         skb_queue_tail(&card->sbpool.queue, new_sb);
+         skb_reserve(new_sb, NS_AAL0_HEADER);
+         push_rxbufs(card, BUF_SM, (u32) new_sb,
+                     (u32) virt_to_bus(new_sb->data), 0, 0);
+      }
+   }
+   if (card->sbfqc < card->sbnr.init)
+#endif /* NS_USE_DESTRUCTORS */
+   {
+      struct sk_buff *new_sb;
+      if ((new_sb = alloc_skb(NS_SMSKBSIZE, GFP_ATOMIC)) != NULL)
+      {
+         skb_queue_tail(&card->sbpool.queue, new_sb);
+         skb_reserve(new_sb, NS_AAL0_HEADER);
+         push_rxbufs(card, BUF_SM, (u32) new_sb,
+                     (u32) virt_to_bus(new_sb->data), 0, 0);
+      }
+   }
+}
+
+
+
+static void dequeue_lg_buf(ns_dev *card, struct sk_buff *lb)
+{
+   skb_unlink(lb);
+#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 = alloc_skb(NS_LGSKBSIZE, GFP_ATOMIC)) != NULL)
+      {
+         skb_queue_tail(&card->lbpool.queue, new_lb);
+         skb_reserve(new_lb, NS_SMBUFSIZE);
+         push_rxbufs(card, BUF_LG, (u32) new_lb,
+                     (u32) virt_to_bus(new_lb->data), 0, 0);
+      }
+   }
+   if (card->lbfqc < card->lbnr.init)
+#endif /* NS_USE_DESTRUCTORS */
+   {
+      struct sk_buff *new_lb;
+      if ((new_lb = alloc_skb(NS_LGSKBSIZE, GFP_ATOMIC)) != NULL)
+      {
+         skb_queue_tail(&card->lbpool.queue, new_lb);
+         skb_reserve(new_lb, NS_SMBUFSIZE);
+         push_rxbufs(card, BUF_LG, (u32) new_lb,
+                     (u32) virt_to_bus(new_lb->data), 0, 0);
+      }
+   }
+}
+
+
+
+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;
+   }
+   /* Dump 25.6 Mbps PHY registers */
+   if (card->max_pcr == IDT_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]);
+   }
+#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 *arg)
+{
+   ns_dev *card;
+   pool_levels pl;
+   int btype;
+   unsigned long flags;
+
+   card = dev->dev_data;
+   switch (cmd)
+   {
+      case NS_GETPSTAT:
+         if (get_user(pl.buftype, &((pool_levels *) 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 -EINVAL;
+
+	 }
+         if (!copy_to_user((pool_levels *) arg, &pl, sizeof(pl)))
+	    return (sizeof(pl));
+	 else
+	    return -EFAULT;
+
+      case NS_SETBUFLEV:
+         if (!suser())
+	    return -EPERM;
+         if (copy_from_user(&pl, (pool_levels *) 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 (!suser())
+	    return -EPERM;
+         btype = (int) arg;	/* an int is the same size as a pointer */
+         switch (btype)
+	 {
+	    case NS_BUFTYPE_SMALL:
+	       while (card->sbfqc < card->sbnr.init)
+	       {
+                  struct sk_buff *sb;
+
+                  sb = alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
+                  if (sb == NULL)
+                     return -ENOMEM;
+                  skb_queue_tail(&card->sbpool.queue, sb);
+                  skb_reserve(sb, NS_AAL0_HEADER);
+                  push_rxbufs(card, BUF_SM, (u32) sb, (u32) virt_to_bus(sb->data), 0, 0);
+	       }
+	       break;
+
+            case NS_BUFTYPE_LARGE:
+	       while (card->lbfqc < card->lbnr.init)
+	       {
+                  struct sk_buff *lb;
+
+                  lb = alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
+                  if (lb == NULL)
+                     return -ENOMEM;
+                  skb_queue_tail(&card->lbpool.queue, lb);
+                  skb_reserve(lb, NS_SMBUFSIZE);
+                  push_rxbufs(card, BUF_LG, (u32) lb, (u32) virt_to_bus(lb->data), 0, 0);
+	       }
+	       break;
+
+            case NS_BUFTYPE_HUGE:
+               while (card->hbpool.count > card->hbnr.init)
+	       {
+                  struct sk_buff *hb;
+
+                  save_flags(flags); cli();
+		  hb = skb_dequeue(&card->hbpool.queue);
+		  card->hbpool.count--;
+		  restore_flags(flags);
+                  if (hb == NULL)
+		     printk("nicstar%d: huge buffer count inconsistent.\n",
+		            card->index);
+                  else
+		     kfree_skb(hb);
+		  
+	       }
+               while (card->hbpool.count < card->hbnr.init)
+               {
+                  struct sk_buff *hb;
+
+                  hb = alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
+                  if (hb == NULL)
+                     return -ENOMEM;
+                  save_flags(flags); cli();
+                  skb_queue_tail(&card->hbpool.queue, hb);
+                  card->hbpool.count++;
+		  restore_flags(flags);
+               }
+	       break;
+
+            case NS_BUFTYPE_IOVEC:
+	       while (card->iovpool.count > card->iovnr.init)
+	       {
+	          struct sk_buff *iovb;
+
+                  save_flags(flags); cli();
+		  iovb = skb_dequeue(&card->iovpool.queue);
+		  card->iovpool.count--;
+		  restore_flags(flags);
+                  if (iovb == NULL)
+		     printk("nicstar%d: iovec buffer count inconsistent.\n",
+		            card->index);
+                  else
+		     kfree_skb(iovb);
+
+	       }
+               while (card->iovpool.count < card->iovnr.init)
+	       {
+	          struct sk_buff *iovb;
+
+                  iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
+                  if (iovb == NULL)
+                     return -ENOMEM;
+                  save_flags(flags); cli();
+                  skb_queue_tail(&card->iovpool.queue, iovb);
+                  card->iovpool.count++;
+		  restore_flags(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 -EINVAL;
+         }
+   }
+}
+
+
+
+static void which_list(ns_dev *card, struct sk_buff *skb)
+{
+   printk("It's a %s buffer.\n", skb->list == &card->sbpool.queue ?
+          "small" : skb->list == &card->lbpool.queue ? "large" :
+	  skb->list == &card->hbpool.queue ? "huge" :
+	  skb->list == &card->iovpool.queue ? "iovec" : "unknown");
+}
+
+
+
+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];
+      save_flags(flags); cli();
+      if (card->in_poll)
+      {
+         printk("nicstar: Re-entering ns_poll()???\n");
+         restore_flags(flags);
+         continue;
+      }
+      card->in_poll = 1;
+      if (card->in_handler)
+      {
+         card->in_poll = 0;
+         printk("nicstar%d: ns_poll called while in interrupt handler!?\n",
+                card->index);
+         restore_flags(flags);
+         continue;
+      }
+
+      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);
+      card->in_poll = 0;
+      restore_flags(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;
+   save_flags(flags); cli();
+   while(CMD_BUSY(card));
+   writel((unsigned long) value, card->membase + DR0);
+   writel(NS_CMD_WRITE_UTILITY | 0x00000200 | (addr & 0x000000FF),
+          card->membase + CMD);
+   restore_flags(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;
+   save_flags(flags); cli();
+   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;
+   restore_flags(flags);
+   return (unsigned char) data;
+}