text: /*
   * 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/dma-mapping.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 <linux/slab.h>
  #include <linux/idr.h>
  #include <asm/io.h>
  #include <asm/uaccess.h>
  #include <linux/atomic.h>
  #include <linux/etherdevice.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 */
  
  /* 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 PTR_DIFF(a, b)	((u32)((unsigned long)(a) - (unsigned long)(b)))
  
  #ifndef ATM_SKB
  #define ATM_SKB(s) (&(s)->atm)
  #endif
  
  #define scq_virt_to_bus(scq, p) \
  		(scq->dma + ((unsigned long)(p) - (unsigned long)(scq)->org))
  
  /* 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(ns_dev *card, int size, u32 scd);
  static void free_scq(ns_dev *card, 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);
  #ifdef EXTRA_DEBUG
  static void which_list(ns_dev * card, struct sk_buff *skb);
  #endif
  static void ns_poll(unsigned long arg);
  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 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 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, card->scq0, NULL);
  	for (j = 0; j < NS_FRSCD_NUM; j++) {
  		if (card->scd2vc[j] != NULL)
  			free_scq(card, card->scd2vc[j]->scq, card->scd2vc[j]->tx_vcc);
  	}
  	idr_destroy(&card->idr);
  	dma_free_coherent(&card->pcidev->dev, NS_RSQSIZE + NS_RSQ_ALIGNMENT,
  			  card->rsq.org, card->rsq.dma);
  	dma_free_coherent(&card->pcidev->dev, NS_TSQSIZE + NS_TSQ_ALIGNMENT,
  			  card->tsq.org, card->tsq.dma);
  	free_irq(card->pcidev->irq, card);
  	iounmap(card->membase);
  	kfree(card);
  }
  
  static struct pci_device_id nicstar_pci_tbl[] = {
  	{ PCI_VDEVICE(IDT, PCI_DEVICE_ID_IDT_IDT77201), 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 = 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 */
  	spin_lock_irqsave(&card->res_lock, 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 */
  	spin_lock_irqsave(&card->res_lock, 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 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 (dma_set_mask_and_coherent(&pcidev->dev, DMA_BIT_MASK(32)) != 0) {
                  printk(KERN_WARNING
  		       "nicstar%d: No suitable DMA available.\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) {
  		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%p.\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 = dma_alloc_coherent(&card->pcidev->dev,
  					   NS_TSQSIZE + NS_TSQ_ALIGNMENT,
  					   &card->tsq.dma, 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 = PTR_ALIGN(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(ALIGN(card->tsq.dma, NS_TSQ_ALIGNMENT), card->membase + TSQB);
  	PRINTK("nicstar%d: TSQ base at 0x%p.\n", i, card->tsq.base);
  
  	/* Initialize RSQ */
  	card->rsq.org = dma_alloc_coherent(&card->pcidev->dev,
  					   NS_RSQSIZE + NS_RSQ_ALIGNMENT,
  					   &card->rsq.dma, 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 = PTR_ALIGN(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(ALIGN(card->rsq.dma, NS_RSQ_ALIGNMENT), card->membase + RSQB);
  	PRINTK("nicstar%d: RSQ base at 0x%p.\n", i, card->rsq.base);
  
  	/* Initialize SCQ0, the only VBR SCQ used */
  	card->scq1 = NULL;
  	card->scq2 = NULL;
  	card->scq0 = get_scq(card, 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] = scq_virt_to_bus(card->scq0, 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%p.\n", i, 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 = NULL;
  	card->sm_addr = 0x00000000;
  	card->lg_handle = NULL;
  	card->lg_addr = 0x00000000;
  
  	card->efbie = 1;	/* To prevent push_rxbufs from enabling the interrupt */
  
  	idr_init(&card->idr);
  
  	/* 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_PRV_BUFTYPE(hb) = 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_PRV_BUFTYPE(lb) = 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->rawcell = (struct ns_rcqe *) lb->data;
  			card->rawch = NS_PRV_DMA(lb);
  		}
  	}
  	/* 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_PRV_BUFTYPE(sb) = 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_PRV_BUFTYPE(iovb) = 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_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", &card->pcidev->dev, &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 (mac[i] == NULL || !mac_pton(mac[i], card->atmdev->esi)) {
  		nicstar_read_eprom(card->membase, NICSTAR_EPROM_MAC_ADDR_OFFSET,
  				   card->atmdev->esi, 6);
  		if (ether_addr_equal(card->atmdev->esi, "\x00\x00\x00\x00\x00\x00")) {
  			nicstar_read_eprom(card->membase,
  					   NICSTAR_EPROM_MAC_ADDR_OFFSET_ALT,
  					   card->atmdev->esi, 6);
  		}
  	}
  
  	printk("nicstar%d: MAC address %pM\n", i, card->atmdev->esi);
  
  	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 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, 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(ns_dev *card, 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)
  		return NULL;
          scq->org = dma_alloc_coherent(&card->pcidev->dev,
  				      2 * size,  &scq->dma, GFP_KERNEL);
  	if (!scq->org) {
  		kfree(scq);
  		return NULL;
  	}
  	scq->skb = kmalloc(sizeof(struct sk_buff *) *
  			   (size / NS_SCQE_SIZE), GFP_KERNEL);
  	if (!scq->skb) {
  		kfree(scq->org);
  		kfree(scq);
  		return NULL;
  	}
  	scq->num_entries = size / NS_SCQE_SIZE;
  	scq->base = PTR_ALIGN(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(ns_dev *card, 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);
  	dma_free_coherent(&card->pcidev->dev,
  			  2 * (scq->num_entries == VBR_SCQ_NUM_ENTRIES ?
  			       VBR_SCQSIZE : CBR_SCQSIZE),
  			  scq->org, scq->dma);
  	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 sk_buff *handle1, *handle2;
  	int id1, id2;
  	u32 addr1, addr2;
  	u32 stat;
  	unsigned long flags;
  
  	/* *BARF* */
  	handle2 = NULL;
  	addr2 = 0;
  	handle1 = skb;
  	addr1 = dma_map_single(&card->pcidev->dev,
  			       skb->data,
  			       (NS_PRV_BUFTYPE(skb) == BUF_SM
  				? NS_SMSKBSIZE : NS_LGSKBSIZE),
  			       DMA_TO_DEVICE);
  	NS_PRV_DMA(skb) = addr1; /* save so we can unmap later */
  
  #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 (NS_PRV_BUFTYPE(skb) == BUF_SM) {
  		if (!addr2) {
  			if (card->sm_addr) {
  				addr2 = card->sm_addr;
  				handle2 = card->sm_handle;
  				card->sm_addr = 0x00000000;
  				card->sm_handle = NULL;
  			} 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 = NULL;
  			} else {	/* (!lg_addr) */
  
  				card->lg_addr = addr1;
  				card->lg_handle = handle1;
  			}
  		}
  	}
  
  	if (addr2) {
  		if (NS_PRV_BUFTYPE(skb) == BUF_SM) {
  			if (card->sbfqc >= card->sbnr.max) {
  				skb_unlink(handle1, &card->sbpool.queue);
  				dev_kfree_skb_any(handle1);
  				skb_unlink(handle2, &card->sbpool.queue);
  				dev_kfree_skb_any(handle2);
  				return;
  			} else
  				card->sbfqc += 2;
  		} else {	/* (buf_type == BUF_LG) */
  
  			if (card->lbfqc >= card->lbnr.max) {
  				skb_unlink(handle1, &card->lbpool.queue);
  				dev_kfree_skb_any(handle1);
  				skb_unlink(handle2, &card->lbpool.queue);
  				dev_kfree_skb_any(handle2);
  				return;
  			} else
  				card->lbfqc += 2;
  		}
  
  		id1 = idr_alloc(&card->idr, handle1, 0, 0, GFP_ATOMIC);
  		if (id1 < 0)
  			goto out;
  
  		id2 = idr_alloc(&card->idr, handle2, 0, 0, GFP_ATOMIC);
  		if (id2 < 0)
  			goto out;
  
  		spin_lock_irqsave(&card->res_lock, flags);
  		while (CMD_BUSY(card)) ;
  		writel(addr2, card->membase + DR3);
  		writel(id2, card->membase + DR2);
  		writel(addr1, card->membase + DR1);
  		writel(id1, card->membase + DR0);
  		writel(NS_CMD_WRITE_FREEBUFQ | NS_PRV_BUFTYPE(skb),
  		       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,
  			(NS_PRV_BUFTYPE(skb) == 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);
  	}
  
  out:
  	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);
  
  	spin_lock_irqsave(&card->int_lock, 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) {
  
  			if (ns_rcqe_islast(card->rawcell)) {
  				struct sk_buff *oldbuf;
  
  				oldbuf = card->rcbuf;
  				card->rcbuf = idr_find(&card->idr,
  						       ns_rcqe_nextbufhandle(card->rawcell));
  				card->rawch = NS_PRV_DMA(card->rcbuf);
  				card->rawcell = (struct ns_rcqe *)
  						card->rcbuf->data;
  				recycle_rx_buf(card, oldbuf);
  			} else {
  				card->rawch += NS_RCQE_SIZE;
  				card->rawcell++;
  			}
  		}
  	}
  
  	/* 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_PRV_BUFTYPE(sb) = 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_PRV_BUFTYPE(lb) = 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(card, 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] = scq_virt_to_bus(scq, 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;
  		spin_lock_irqsave(&card->res_lock, 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_PRV_IOVCNT(iovb));
  			NS_PRV_IOVCNT(iovb) = 0;
  			spin_lock_irqsave(&card->int_lock, 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 (;;) {
  			spin_lock_irqsave(&scq->lock, 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 = scq_virt_to_bus(scq, 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(card, 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;
  
  		spin_lock_irqsave(&scq->lock, 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%p  next = 0x%p  last = 0x%p  TSQT = 0x%08X \n",
  		     card->tsq.base, card->tsq.next,
  		     card->tsq.last, readl(card->membase + TSQT));
  		printk
  		    ("RSQ: base = 0x%p  next = 0x%p  last = 0x%p  RSQT = 0x%08X \n",
  		     card->rsq.base, card->rsq.next,
  		     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;
  
  	NS_PRV_DMA(skb) = dma_map_single(&card->pcidev->dev, skb->data,
  					 skb->len, DMA_TO_DEVICE);
  
  	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(NS_PRV_DMA(skb));
  		scqe.word_3 = cpu_to_le32(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(NS_PRV_DMA(skb) + 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;
  
  	spin_lock_irqsave(&scq->lock, 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;
  		wait_event_interruptible_lock_irq_timeout(scq->scqfull_waitq,
  							  scq->tail != scq->next,
  							  scq->lock,
  							  SCQFULL_TIMEOUT);
  
  		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%p (pos %d).\n",
  		card->index, skb, index);
  	XPRINTK("nicstar%d: TBD written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%p.\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),
  		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 = scq_virt_to_bus(scq, 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;
  			wait_event_interruptible_lock_irq_timeout(scq->scqfull_waitq,
  								  scq->tail != scq->next,
  								  scq->lock,
  								  SCQFULL_TIMEOUT);
  		}
  
  		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%p.\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), 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 = scq_virt_to_bus(scq, 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(PTR_DIFF(previous, 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%p, pos %d.\n",
  		card->index, scq, pos);
  	if (pos >= scq->num_entries) {
  		printk("nicstar%d: Bad index on drain_scq().\n", card->index);
  		return;
  	}
  
  	spin_lock_irqsave(&scq->lock, 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%p (index %d).\n",
  			card->index, skb, i);
  		if (skb != NULL) {
  			dma_unmap_single(&card->pcidev->dev,
  					 NS_PRV_DMA(skb),
  					 skb->len,
  					 DMA_TO_DEVICE);
  			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(PTR_DIFF(previous, 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;
  	u32 id;
  
  	stat = readl(card->membase + STAT);
  	card->sbfqc = ns_stat_sfbqc_get(stat);
  	card->lbfqc = ns_stat_lfbqc_get(stat);
  
  	id = le32_to_cpu(rsqe->buffer_handle);
  	skb = idr_find(&card->idr, id);
  	if (!skb) {
  		RXPRINTK(KERN_ERR
  			 "nicstar%d: idr_find() failed!\n", card->index);
  		return;
  	}
  	idr_remove(&card->idr, id);
  	dma_sync_single_for_cpu(&card->pcidev->dev,
  				NS_PRV_DMA(skb),
  				(NS_PRV_BUFTYPE(skb) == BUF_SM
  				 ? NS_SMSKBSIZE : NS_LGSKBSIZE),
  				DMA_FROM_DEVICE);
  	dma_unmap_single(&card->pcidev->dev,
  			 NS_PRV_DMA(skb),
  			 (NS_PRV_BUFTYPE(skb) == BUF_SM
  			  ? NS_SMSKBSIZE : NS_LGSKBSIZE),
  			 DMA_FROM_DEVICE);
  	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_PRV_BUFTYPE(iovb) = 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_PRV_BUFTYPE(iovb) = BUF_NONE;
  				skb_queue_tail(&card->iovpool.queue, new_iovb);
  				card->iovpool.count++;
  			}
  		}
  		vc->rx_iov = iovb;
  		NS_PRV_IOVCNT(iovb) = 0;
  		iovb->len = 0;
  		iovb->data = iovb->head;
  		skb_reset_tail_pointer(iovb);
  		/* 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_PRV_IOVCNT(iovb) >= 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_PRV_IOVCNT(iovb) = 0;
  		iovb->len = 0;
  		iovb->data = iovb->head;
  		skb_reset_tail_pointer(iovb);
  	}
  	iov = &((struct iovec *)iovb->data)[NS_PRV_IOVCNT(iovb)++];
  	iov->iov_base = (void *)skb;
  	iov->iov_len = ns_rsqe_cellcount(rsqe) * 48;
  	iovb->len += iov->iov_len;
  
  #ifdef EXTRA_DEBUG
  	if (NS_PRV_IOVCNT(iovb) == 1) {
  		if (NS_PRV_BUFTYPE(skb) != 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_PRV_IOVCNT(iovb) >= 2 */
  
  		if (NS_PRV_BUFTYPE(skb) != 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_PRV_IOVCNT(iovb));
  			vc->rx_iov = NULL;
  			recycle_iov_buf(card, iovb);
  			return;
  		}
  	}
  #endif /* EXTRA_DEBUG */
  
  	if (ns_rsqe_eopdu(rsqe)) {
  		/* This works correctly regardless of the endianness of the host */
  		unsigned char *L1L2 = (unsigned char *)
  						(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_PRV_IOVCNT(iovb));
  			vc->rx_iov = NULL;
  			recycle_iov_buf(card, iovb);
  			return;
  		}
  
  		/* By this point we (hopefully) have a complete SDU without errors. */
  
  		if (NS_PRV_IOVCNT(iovb) == 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_PRV_IOVCNT(iovb) == 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_PRV_IOVCNT(iovb));
  					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_PRV_BUFTYPE(hb) = 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_PRV_BUFTYPE(new_hb) = 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_PRV_BUFTYPE(new_hb) =
  						    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_PRV_IOVCNT(iovb));
  				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_PRV_IOVCNT(iovb); 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_PRV_BUFTYPE(sb) = 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_PRV_BUFTYPE(lb) = 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_PRV_BUFTYPE(hb) = 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)
  {
  	if (unlikely(NS_PRV_BUFTYPE(skb) == 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_PRV_BUFTYPE(new_sb) = 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_PRV_BUFTYPE(new_sb) = 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_PRV_BUFTYPE(new_lb) = 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_PRV_BUFTYPE(new_lb) = 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_PRV_BUFTYPE(sb) = 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_PRV_BUFTYPE(lb) = 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;
  
  				spin_lock_irqsave(&card->int_lock, 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_PRV_BUFTYPE(hb) = BUF_NONE;
  				spin_lock_irqsave(&card->int_lock, 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;
  
  				spin_lock_irqsave(&card->int_lock, 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_PRV_BUFTYPE(iovb) = BUF_NONE;
  				spin_lock_irqsave(&card->int_lock, 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;
  		}
  	}
  }
  
  #ifdef EXTRA_DEBUG
  static void which_list(ns_dev * card, struct sk_buff *skb)
  {
  	printk("skb buf_type: 0x%08x\n", NS_PRV_BUFTYPE(skb));
  }
  #endif /* EXTRA_DEBUG */
  
  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;
  		}
  		spin_lock_irqsave(&card->int_lock, 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 void ns_phy_put(struct atm_dev *dev, unsigned char value,
  		       unsigned long addr)
  {
  	ns_dev *card;
  	unsigned long flags;
  
  	card = dev->dev_data;
  	spin_lock_irqsave(&card->res_lock, flags);
  	while (CMD_BUSY(card)) ;
  	writel((u32) 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;
  	u32 data;
  
  	card = dev->dev_data;
  	spin_lock_irqsave(&card->res_lock, 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);
  