linux/drivers/atm/nicstar.c
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   1/*
   2 * nicstar.c
   3 *
   4 * Device driver supporting CBR for IDT 77201/77211 "NICStAR" based cards.
   5 *
   6 * IMPORTANT: The included file nicstarmac.c was NOT WRITTEN BY ME.
   7 *            It was taken from the frle-0.22 device driver.
   8 *            As the file doesn't have a copyright notice, in the file
   9 *            nicstarmac.copyright I put the copyright notice from the
  10 *            frle-0.22 device driver.
  11 *            Some code is based on the nicstar driver by M. Welsh.
  12 *
  13 * Author: Rui Prior (rprior@inescn.pt)
  14 * PowerPC support by Jay Talbott (jay_talbott@mcg.mot.com) April 1999
  15 *
  16 *
  17 * (C) INESC 1999
  18 */
  19
  20/*
  21 * IMPORTANT INFORMATION
  22 *
  23 * There are currently three types of spinlocks:
  24 *
  25 * 1 - Per card interrupt spinlock (to protect structures and such)
  26 * 2 - Per SCQ scq spinlock
  27 * 3 - Per card resource spinlock (to access registers, etc.)
  28 *
  29 * These must NEVER be grabbed in reverse order.
  30 *
  31 */
  32
  33/* Header files */
  34
  35#include <linux/module.h>
  36#include <linux/kernel.h>
  37#include <linux/skbuff.h>
  38#include <linux/atmdev.h>
  39#include <linux/atm.h>
  40#include <linux/pci.h>
  41#include <linux/dma-mapping.h>
  42#include <linux/types.h>
  43#include <linux/string.h>
  44#include <linux/delay.h>
  45#include <linux/init.h>
  46#include <linux/sched.h>
  47#include <linux/timer.h>
  48#include <linux/interrupt.h>
  49#include <linux/bitops.h>
  50#include <linux/slab.h>
  51#include <linux/idr.h>
  52#include <asm/io.h>
  53#include <asm/uaccess.h>
  54#include <linux/atomic.h>
  55#include <linux/etherdevice.h>
  56#include "nicstar.h"
  57#ifdef CONFIG_ATM_NICSTAR_USE_SUNI
  58#include "suni.h"
  59#endif /* CONFIG_ATM_NICSTAR_USE_SUNI */
  60#ifdef CONFIG_ATM_NICSTAR_USE_IDT77105
  61#include "idt77105.h"
  62#endif /* CONFIG_ATM_NICSTAR_USE_IDT77105 */
  63
  64/* Additional code */
  65
  66#include "nicstarmac.c"
  67
  68/* Configurable parameters */
  69
  70#undef PHY_LOOPBACK
  71#undef TX_DEBUG
  72#undef RX_DEBUG
  73#undef GENERAL_DEBUG
  74#undef EXTRA_DEBUG
  75
  76/* Do not touch these */
  77
  78#ifdef TX_DEBUG
  79#define TXPRINTK(args...) printk(args)
  80#else
  81#define TXPRINTK(args...)
  82#endif /* TX_DEBUG */
  83
  84#ifdef RX_DEBUG
  85#define RXPRINTK(args...) printk(args)
  86#else
  87#define RXPRINTK(args...)
  88#endif /* RX_DEBUG */
  89
  90#ifdef GENERAL_DEBUG
  91#define PRINTK(args...) printk(args)
  92#else
  93#define PRINTK(args...)
  94#endif /* GENERAL_DEBUG */
  95
  96#ifdef EXTRA_DEBUG
  97#define XPRINTK(args...) printk(args)
  98#else
  99#define XPRINTK(args...)
 100#endif /* EXTRA_DEBUG */
 101
 102/* Macros */
 103
 104#define CMD_BUSY(card) (readl((card)->membase + STAT) & NS_STAT_CMDBZ)
 105
 106#define NS_DELAY mdelay(1)
 107
 108#define PTR_DIFF(a, b)  ((u32)((unsigned long)(a) - (unsigned long)(b)))
 109
 110#ifndef ATM_SKB
 111#define ATM_SKB(s) (&(s)->atm)
 112#endif
 113
 114#define scq_virt_to_bus(scq, p) \
 115                (scq->dma + ((unsigned long)(p) - (unsigned long)(scq)->org))
 116
 117/* Function declarations */
 118
 119static u32 ns_read_sram(ns_dev * card, u32 sram_address);
 120static void ns_write_sram(ns_dev * card, u32 sram_address, u32 * value,
 121                          int count);
 122static int ns_init_card(int i, struct pci_dev *pcidev);
 123static void ns_init_card_error(ns_dev * card, int error);
 124static scq_info *get_scq(ns_dev *card, int size, u32 scd);
 125static void free_scq(ns_dev *card, scq_info * scq, struct atm_vcc *vcc);
 126static void push_rxbufs(ns_dev *, struct sk_buff *);
 127static irqreturn_t ns_irq_handler(int irq, void *dev_id);
 128static int ns_open(struct atm_vcc *vcc);
 129static void ns_close(struct atm_vcc *vcc);
 130static void fill_tst(ns_dev * card, int n, vc_map * vc);
 131static int ns_send(struct atm_vcc *vcc, struct sk_buff *skb);
 132static int push_scqe(ns_dev * card, vc_map * vc, scq_info * scq, ns_scqe * tbd,
 133                     struct sk_buff *skb);
 134static void process_tsq(ns_dev * card);
 135static void drain_scq(ns_dev * card, scq_info * scq, int pos);
 136static void process_rsq(ns_dev * card);
 137static void dequeue_rx(ns_dev * card, ns_rsqe * rsqe);
 138static void recycle_rx_buf(ns_dev * card, struct sk_buff *skb);
 139static void recycle_iovec_rx_bufs(ns_dev * card, struct iovec *iov, int count);
 140static void recycle_iov_buf(ns_dev * card, struct sk_buff *iovb);
 141static void dequeue_sm_buf(ns_dev * card, struct sk_buff *sb);
 142static void dequeue_lg_buf(ns_dev * card, struct sk_buff *lb);
 143static int ns_proc_read(struct atm_dev *dev, loff_t * pos, char *page);
 144static int ns_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg);
 145#ifdef EXTRA_DEBUG
 146static void which_list(ns_dev * card, struct sk_buff *skb);
 147#endif
 148static void ns_poll(unsigned long arg);
 149static void ns_phy_put(struct atm_dev *dev, unsigned char value,
 150                       unsigned long addr);
 151static unsigned char ns_phy_get(struct atm_dev *dev, unsigned long addr);
 152
 153/* Global variables */
 154
 155static struct ns_dev *cards[NS_MAX_CARDS];
 156static unsigned num_cards;
 157static struct atmdev_ops atm_ops = {
 158        .open = ns_open,
 159        .close = ns_close,
 160        .ioctl = ns_ioctl,
 161        .send = ns_send,
 162        .phy_put = ns_phy_put,
 163        .phy_get = ns_phy_get,
 164        .proc_read = ns_proc_read,
 165        .owner = THIS_MODULE,
 166};
 167
 168static struct timer_list ns_timer;
 169static char *mac[NS_MAX_CARDS];
 170module_param_array(mac, charp, NULL, 0);
 171MODULE_LICENSE("GPL");
 172
 173/* Functions */
 174
 175static int nicstar_init_one(struct pci_dev *pcidev,
 176                            const struct pci_device_id *ent)
 177{
 178        static int index = -1;
 179        unsigned int error;
 180
 181        index++;
 182        cards[index] = NULL;
 183
 184        error = ns_init_card(index, pcidev);
 185        if (error) {
 186                cards[index--] = NULL;  /* don't increment index */
 187                goto err_out;
 188        }
 189
 190        return 0;
 191err_out:
 192        return -ENODEV;
 193}
 194
 195static void nicstar_remove_one(struct pci_dev *pcidev)
 196{
 197        int i, j;
 198        ns_dev *card = pci_get_drvdata(pcidev);
 199        struct sk_buff *hb;
 200        struct sk_buff *iovb;
 201        struct sk_buff *lb;
 202        struct sk_buff *sb;
 203
 204        i = card->index;
 205
 206        if (cards[i] == NULL)
 207                return;
 208
 209        if (card->atmdev->phy && card->atmdev->phy->stop)
 210                card->atmdev->phy->stop(card->atmdev);
 211
 212        /* Stop everything */
 213        writel(0x00000000, card->membase + CFG);
 214
 215        /* De-register device */
 216        atm_dev_deregister(card->atmdev);
 217
 218        /* Disable PCI device */
 219        pci_disable_device(pcidev);
 220
 221        /* Free up resources */
 222        j = 0;
 223        PRINTK("nicstar%d: freeing %d huge buffers.\n", i, card->hbpool.count);
 224        while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL) {
 225                dev_kfree_skb_any(hb);
 226                j++;
 227        }
 228        PRINTK("nicstar%d: %d huge buffers freed.\n", i, j);
 229        j = 0;
 230        PRINTK("nicstar%d: freeing %d iovec buffers.\n", i,
 231               card->iovpool.count);
 232        while ((iovb = skb_dequeue(&card->iovpool.queue)) != NULL) {
 233                dev_kfree_skb_any(iovb);
 234                j++;
 235        }
 236        PRINTK("nicstar%d: %d iovec buffers freed.\n", i, j);
 237        while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
 238                dev_kfree_skb_any(lb);
 239        while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
 240                dev_kfree_skb_any(sb);
 241        free_scq(card, card->scq0, NULL);
 242        for (j = 0; j < NS_FRSCD_NUM; j++) {
 243                if (card->scd2vc[j] != NULL)
 244                        free_scq(card, card->scd2vc[j]->scq, card->scd2vc[j]->tx_vcc);
 245        }
 246        idr_destroy(&card->idr);
 247        dma_free_coherent(&card->pcidev->dev, NS_RSQSIZE + NS_RSQ_ALIGNMENT,
 248                          card->rsq.org, card->rsq.dma);
 249        dma_free_coherent(&card->pcidev->dev, NS_TSQSIZE + NS_TSQ_ALIGNMENT,
 250                          card->tsq.org, card->tsq.dma);
 251        free_irq(card->pcidev->irq, card);
 252        iounmap(card->membase);
 253        kfree(card);
 254}
 255
 256static struct pci_device_id nicstar_pci_tbl[] = {
 257        { PCI_VDEVICE(IDT, PCI_DEVICE_ID_IDT_IDT77201), 0 },
 258        {0,}                    /* terminate list */
 259};
 260
 261MODULE_DEVICE_TABLE(pci, nicstar_pci_tbl);
 262
 263static struct pci_driver nicstar_driver = {
 264        .name = "nicstar",
 265        .id_table = nicstar_pci_tbl,
 266        .probe = nicstar_init_one,
 267        .remove = nicstar_remove_one,
 268};
 269
 270static int __init nicstar_init(void)
 271{
 272        unsigned error = 0;     /* Initialized to remove compile warning */
 273
 274        XPRINTK("nicstar: nicstar_init() called.\n");
 275
 276        error = pci_register_driver(&nicstar_driver);
 277
 278        TXPRINTK("nicstar: TX debug enabled.\n");
 279        RXPRINTK("nicstar: RX debug enabled.\n");
 280        PRINTK("nicstar: General debug enabled.\n");
 281#ifdef PHY_LOOPBACK
 282        printk("nicstar: using PHY loopback.\n");
 283#endif /* PHY_LOOPBACK */
 284        XPRINTK("nicstar: nicstar_init() returned.\n");
 285
 286        if (!error) {
 287                init_timer(&ns_timer);
 288                ns_timer.expires = jiffies + NS_POLL_PERIOD;
 289                ns_timer.data = 0UL;
 290                ns_timer.function = ns_poll;
 291                add_timer(&ns_timer);
 292        }
 293
 294        return error;
 295}
 296
 297static void __exit nicstar_cleanup(void)
 298{
 299        XPRINTK("nicstar: nicstar_cleanup() called.\n");
 300
 301        del_timer(&ns_timer);
 302
 303        pci_unregister_driver(&nicstar_driver);
 304
 305        XPRINTK("nicstar: nicstar_cleanup() returned.\n");
 306}
 307
 308static u32 ns_read_sram(ns_dev * card, u32 sram_address)
 309{
 310        unsigned long flags;
 311        u32 data;
 312        sram_address <<= 2;
 313        sram_address &= 0x0007FFFC;     /* address must be dword aligned */
 314        sram_address |= 0x50000000;     /* SRAM read command */
 315        spin_lock_irqsave(&card->res_lock, flags);
 316        while (CMD_BUSY(card)) ;
 317        writel(sram_address, card->membase + CMD);
 318        while (CMD_BUSY(card)) ;
 319        data = readl(card->membase + DR0);
 320        spin_unlock_irqrestore(&card->res_lock, flags);
 321        return data;
 322}
 323
 324static void ns_write_sram(ns_dev * card, u32 sram_address, u32 * value,
 325                          int count)
 326{
 327        unsigned long flags;
 328        int i, c;
 329        count--;                /* count range now is 0..3 instead of 1..4 */
 330        c = count;
 331        c <<= 2;                /* to use increments of 4 */
 332        spin_lock_irqsave(&card->res_lock, flags);
 333        while (CMD_BUSY(card)) ;
 334        for (i = 0; i <= c; i += 4)
 335                writel(*(value++), card->membase + i);
 336        /* Note: DR# registers are the first 4 dwords in nicstar's memspace,
 337           so card->membase + DR0 == card->membase */
 338        sram_address <<= 2;
 339        sram_address &= 0x0007FFFC;
 340        sram_address |= (0x40000000 | count);
 341        writel(sram_address, card->membase + CMD);
 342        spin_unlock_irqrestore(&card->res_lock, flags);
 343}
 344
 345static int ns_init_card(int i, struct pci_dev *pcidev)
 346{
 347        int j;
 348        struct ns_dev *card = NULL;
 349        unsigned char pci_latency;
 350        unsigned error;
 351        u32 data;
 352        u32 u32d[4];
 353        u32 ns_cfg_rctsize;
 354        int bcount;
 355        unsigned long membase;
 356
 357        error = 0;
 358
 359        if (pci_enable_device(pcidev)) {
 360                printk("nicstar%d: can't enable PCI device\n", i);
 361                error = 2;
 362                ns_init_card_error(card, error);
 363                return error;
 364        }
 365        if (dma_set_mask_and_coherent(&pcidev->dev, DMA_BIT_MASK(32)) != 0) {
 366                printk(KERN_WARNING
 367                       "nicstar%d: No suitable DMA available.\n", i);
 368                error = 2;
 369                ns_init_card_error(card, error);
 370                return error;
 371        }
 372
 373        card = kmalloc(sizeof(*card), GFP_KERNEL);
 374        if (!card) {
 375                printk
 376                    ("nicstar%d: can't allocate memory for device structure.\n",
 377                     i);
 378                error = 2;
 379                ns_init_card_error(card, error);
 380                return error;
 381        }
 382        cards[i] = card;
 383        spin_lock_init(&card->int_lock);
 384        spin_lock_init(&card->res_lock);
 385
 386        pci_set_drvdata(pcidev, card);
 387
 388        card->index = i;
 389        card->atmdev = NULL;
 390        card->pcidev = pcidev;
 391        membase = pci_resource_start(pcidev, 1);
 392        card->membase = ioremap(membase, NS_IOREMAP_SIZE);
 393        if (!card->membase) {
 394                printk("nicstar%d: can't ioremap() membase.\n", i);
 395                error = 3;
 396                ns_init_card_error(card, error);
 397                return error;
 398        }
 399        PRINTK("nicstar%d: membase at 0x%p.\n", i, card->membase);
 400
 401        pci_set_master(pcidev);
 402
 403        if (pci_read_config_byte(pcidev, PCI_LATENCY_TIMER, &pci_latency) != 0) {
 404                printk("nicstar%d: can't read PCI latency timer.\n", i);
 405                error = 6;
 406                ns_init_card_error(card, error);
 407                return error;
 408        }
 409#ifdef NS_PCI_LATENCY
 410        if (pci_latency < NS_PCI_LATENCY) {
 411                PRINTK("nicstar%d: setting PCI latency timer to %d.\n", i,
 412                       NS_PCI_LATENCY);
 413                for (j = 1; j < 4; j++) {
 414                        if (pci_write_config_byte
 415                            (pcidev, PCI_LATENCY_TIMER, NS_PCI_LATENCY) != 0)
 416                                break;
 417                }
 418                if (j == 4) {
 419                        printk
 420                            ("nicstar%d: can't set PCI latency timer to %d.\n",
 421                             i, NS_PCI_LATENCY);
 422                        error = 7;
 423                        ns_init_card_error(card, error);
 424                        return error;
 425                }
 426        }
 427#endif /* NS_PCI_LATENCY */
 428
 429        /* Clear timer overflow */
 430        data = readl(card->membase + STAT);
 431        if (data & NS_STAT_TMROF)
 432                writel(NS_STAT_TMROF, card->membase + STAT);
 433
 434        /* Software reset */
 435        writel(NS_CFG_SWRST, card->membase + CFG);
 436        NS_DELAY;
 437        writel(0x00000000, card->membase + CFG);
 438
 439        /* PHY reset */
 440        writel(0x00000008, card->membase + GP);
 441        NS_DELAY;
 442        writel(0x00000001, card->membase + GP);
 443        NS_DELAY;
 444        while (CMD_BUSY(card)) ;
 445        writel(NS_CMD_WRITE_UTILITY | 0x00000100, card->membase + CMD); /* Sync UTOPIA with SAR clock */
 446        NS_DELAY;
 447
 448        /* Detect PHY type */
 449        while (CMD_BUSY(card)) ;
 450        writel(NS_CMD_READ_UTILITY | 0x00000200, card->membase + CMD);
 451        while (CMD_BUSY(card)) ;
 452        data = readl(card->membase + DR0);
 453        switch (data) {
 454        case 0x00000009:
 455                printk("nicstar%d: PHY seems to be 25 Mbps.\n", i);
 456                card->max_pcr = ATM_25_PCR;
 457                while (CMD_BUSY(card)) ;
 458                writel(0x00000008, card->membase + DR0);
 459                writel(NS_CMD_WRITE_UTILITY | 0x00000200, card->membase + CMD);
 460                /* Clear an eventual pending interrupt */
 461                writel(NS_STAT_SFBQF, card->membase + STAT);
 462#ifdef PHY_LOOPBACK
 463                while (CMD_BUSY(card)) ;
 464                writel(0x00000022, card->membase + DR0);
 465                writel(NS_CMD_WRITE_UTILITY | 0x00000202, card->membase + CMD);
 466#endif /* PHY_LOOPBACK */
 467                break;
 468        case 0x00000030:
 469        case 0x00000031:
 470                printk("nicstar%d: PHY seems to be 155 Mbps.\n", i);
 471                card->max_pcr = ATM_OC3_PCR;
 472#ifdef PHY_LOOPBACK
 473                while (CMD_BUSY(card)) ;
 474                writel(0x00000002, card->membase + DR0);
 475                writel(NS_CMD_WRITE_UTILITY | 0x00000205, card->membase + CMD);
 476#endif /* PHY_LOOPBACK */
 477                break;
 478        default:
 479                printk("nicstar%d: unknown PHY type (0x%08X).\n", i, data);
 480                error = 8;
 481                ns_init_card_error(card, error);
 482                return error;
 483        }
 484        writel(0x00000000, card->membase + GP);
 485
 486        /* Determine SRAM size */
 487        data = 0x76543210;
 488        ns_write_sram(card, 0x1C003, &data, 1);
 489        data = 0x89ABCDEF;
 490        ns_write_sram(card, 0x14003, &data, 1);
 491        if (ns_read_sram(card, 0x14003) == 0x89ABCDEF &&
 492            ns_read_sram(card, 0x1C003) == 0x76543210)
 493                card->sram_size = 128;
 494        else
 495                card->sram_size = 32;
 496        PRINTK("nicstar%d: %dK x 32bit SRAM size.\n", i, card->sram_size);
 497
 498        card->rct_size = NS_MAX_RCTSIZE;
 499
 500#if (NS_MAX_RCTSIZE == 4096)
 501        if (card->sram_size == 128)
 502                printk
 503                    ("nicstar%d: limiting maximum VCI. See NS_MAX_RCTSIZE in nicstar.h\n",
 504                     i);
 505#elif (NS_MAX_RCTSIZE == 16384)
 506        if (card->sram_size == 32) {
 507                printk
 508                    ("nicstar%d: wasting memory. See NS_MAX_RCTSIZE in nicstar.h\n",
 509                     i);
 510                card->rct_size = 4096;
 511        }
 512#else
 513#error NS_MAX_RCTSIZE must be either 4096 or 16384 in nicstar.c
 514#endif
 515
 516        card->vpibits = NS_VPIBITS;
 517        if (card->rct_size == 4096)
 518                card->vcibits = 12 - NS_VPIBITS;
 519        else                    /* card->rct_size == 16384 */
 520                card->vcibits = 14 - NS_VPIBITS;
 521
 522        /* Initialize the nicstar eeprom/eprom stuff, for the MAC addr */
 523        if (mac[i] == NULL)
 524                nicstar_init_eprom(card->membase);
 525
 526        /* Set the VPI/VCI MSb mask to zero so we can receive OAM cells */
 527        writel(0x00000000, card->membase + VPM);
 528
 529        /* Initialize TSQ */
 530        card->tsq.org = dma_alloc_coherent(&card->pcidev->dev,
 531                                           NS_TSQSIZE + NS_TSQ_ALIGNMENT,
 532                                           &card->tsq.dma, GFP_KERNEL);
 533        if (card->tsq.org == NULL) {
 534                printk("nicstar%d: can't allocate TSQ.\n", i);
 535                error = 10;
 536                ns_init_card_error(card, error);
 537                return error;
 538        }
 539        card->tsq.base = PTR_ALIGN(card->tsq.org, NS_TSQ_ALIGNMENT);
 540        card->tsq.next = card->tsq.base;
 541        card->tsq.last = card->tsq.base + (NS_TSQ_NUM_ENTRIES - 1);
 542        for (j = 0; j < NS_TSQ_NUM_ENTRIES; j++)
 543                ns_tsi_init(card->tsq.base + j);
 544        writel(0x00000000, card->membase + TSQH);
 545        writel(ALIGN(card->tsq.dma, NS_TSQ_ALIGNMENT), card->membase + TSQB);
 546        PRINTK("nicstar%d: TSQ base at 0x%p.\n", i, card->tsq.base);
 547
 548        /* Initialize RSQ */
 549        card->rsq.org = dma_alloc_coherent(&card->pcidev->dev,
 550                                           NS_RSQSIZE + NS_RSQ_ALIGNMENT,
 551                                           &card->rsq.dma, GFP_KERNEL);
 552        if (card->rsq.org == NULL) {
 553                printk("nicstar%d: can't allocate RSQ.\n", i);
 554                error = 11;
 555                ns_init_card_error(card, error);
 556                return error;
 557        }
 558        card->rsq.base = PTR_ALIGN(card->rsq.org, NS_RSQ_ALIGNMENT);
 559        card->rsq.next = card->rsq.base;
 560        card->rsq.last = card->rsq.base + (NS_RSQ_NUM_ENTRIES - 1);
 561        for (j = 0; j < NS_RSQ_NUM_ENTRIES; j++)
 562                ns_rsqe_init(card->rsq.base + j);
 563        writel(0x00000000, card->membase + RSQH);
 564        writel(ALIGN(card->rsq.dma, NS_RSQ_ALIGNMENT), card->membase + RSQB);
 565        PRINTK("nicstar%d: RSQ base at 0x%p.\n", i, card->rsq.base);
 566
 567        /* Initialize SCQ0, the only VBR SCQ used */
 568        card->scq1 = NULL;
 569        card->scq2 = NULL;
 570        card->scq0 = get_scq(card, VBR_SCQSIZE, NS_VRSCD0);
 571        if (card->scq0 == NULL) {
 572                printk("nicstar%d: can't get SCQ0.\n", i);
 573                error = 12;
 574                ns_init_card_error(card, error);
 575                return error;
 576        }
 577        u32d[0] = scq_virt_to_bus(card->scq0, card->scq0->base);
 578        u32d[1] = (u32) 0x00000000;
 579        u32d[2] = (u32) 0xffffffff;
 580        u32d[3] = (u32) 0x00000000;
 581        ns_write_sram(card, NS_VRSCD0, u32d, 4);
 582        ns_write_sram(card, NS_VRSCD1, u32d, 4);        /* These last two won't be used */
 583        ns_write_sram(card, NS_VRSCD2, u32d, 4);        /* but are initialized, just in case... */
 584        card->scq0->scd = NS_VRSCD0;
 585        PRINTK("nicstar%d: VBR-SCQ0 base at 0x%p.\n", i, card->scq0->base);
 586
 587        /* Initialize TSTs */
 588        card->tst_addr = NS_TST0;
 589        card->tst_free_entries = NS_TST_NUM_ENTRIES;
 590        data = NS_TST_OPCODE_VARIABLE;
 591        for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
 592                ns_write_sram(card, NS_TST0 + j, &data, 1);
 593        data = ns_tste_make(NS_TST_OPCODE_END, NS_TST0);
 594        ns_write_sram(card, NS_TST0 + NS_TST_NUM_ENTRIES, &data, 1);
 595        for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
 596                ns_write_sram(card, NS_TST1 + j, &data, 1);
 597        data = ns_tste_make(NS_TST_OPCODE_END, NS_TST1);
 598        ns_write_sram(card, NS_TST1 + NS_TST_NUM_ENTRIES, &data, 1);
 599        for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
 600                card->tste2vc[j] = NULL;
 601        writel(NS_TST0 << 2, card->membase + TSTB);
 602
 603        /* Initialize RCT. AAL type is set on opening the VC. */
 604#ifdef RCQ_SUPPORT
 605        u32d[0] = NS_RCTE_RAWCELLINTEN;
 606#else
 607        u32d[0] = 0x00000000;
 608#endif /* RCQ_SUPPORT */
 609        u32d[1] = 0x00000000;
 610        u32d[2] = 0x00000000;
 611        u32d[3] = 0xFFFFFFFF;
 612        for (j = 0; j < card->rct_size; j++)
 613                ns_write_sram(card, j * 4, u32d, 4);
 614
 615        memset(card->vcmap, 0, sizeof(card->vcmap));
 616
 617        for (j = 0; j < NS_FRSCD_NUM; j++)
 618                card->scd2vc[j] = NULL;
 619
 620        /* Initialize buffer levels */
 621        card->sbnr.min = MIN_SB;
 622        card->sbnr.init = NUM_SB;
 623        card->sbnr.max = MAX_SB;
 624        card->lbnr.min = MIN_LB;
 625        card->lbnr.init = NUM_LB;
 626        card->lbnr.max = MAX_LB;
 627        card->iovnr.min = MIN_IOVB;
 628        card->iovnr.init = NUM_IOVB;
 629        card->iovnr.max = MAX_IOVB;
 630        card->hbnr.min = MIN_HB;
 631        card->hbnr.init = NUM_HB;
 632        card->hbnr.max = MAX_HB;
 633
 634        card->sm_handle = NULL;
 635        card->sm_addr = 0x00000000;
 636        card->lg_handle = NULL;
 637        card->lg_addr = 0x00000000;
 638
 639        card->efbie = 1;        /* To prevent push_rxbufs from enabling the interrupt */
 640
 641        idr_init(&card->idr);
 642
 643        /* Pre-allocate some huge buffers */
 644        skb_queue_head_init(&card->hbpool.queue);
 645        card->hbpool.count = 0;
 646        for (j = 0; j < NUM_HB; j++) {
 647                struct sk_buff *hb;
 648                hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
 649                if (hb == NULL) {
 650                        printk
 651                            ("nicstar%d: can't allocate %dth of %d huge buffers.\n",
 652                             i, j, NUM_HB);
 653                        error = 13;
 654                        ns_init_card_error(card, error);
 655                        return error;
 656                }
 657                NS_PRV_BUFTYPE(hb) = BUF_NONE;
 658                skb_queue_tail(&card->hbpool.queue, hb);
 659                card->hbpool.count++;
 660        }
 661
 662        /* Allocate large buffers */
 663        skb_queue_head_init(&card->lbpool.queue);
 664        card->lbpool.count = 0; /* Not used */
 665        for (j = 0; j < NUM_LB; j++) {
 666                struct sk_buff *lb;
 667                lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
 668                if (lb == NULL) {
 669                        printk
 670                            ("nicstar%d: can't allocate %dth of %d large buffers.\n",
 671                             i, j, NUM_LB);
 672                        error = 14;
 673                        ns_init_card_error(card, error);
 674                        return error;
 675                }
 676                NS_PRV_BUFTYPE(lb) = BUF_LG;
 677                skb_queue_tail(&card->lbpool.queue, lb);
 678                skb_reserve(lb, NS_SMBUFSIZE);
 679                push_rxbufs(card, lb);
 680                /* Due to the implementation of push_rxbufs() this is 1, not 0 */
 681                if (j == 1) {
 682                        card->rcbuf = lb;
 683                        card->rawcell = (struct ns_rcqe *) lb->data;
 684                        card->rawch = NS_PRV_DMA(lb);
 685                }
 686        }
 687        /* Test for strange behaviour which leads to crashes */
 688        if ((bcount =
 689             ns_stat_lfbqc_get(readl(card->membase + STAT))) < card->lbnr.min) {
 690                printk
 691                    ("nicstar%d: Strange... Just allocated %d large buffers and lfbqc = %d.\n",
 692                     i, j, bcount);
 693                error = 14;
 694                ns_init_card_error(card, error);
 695                return error;
 696        }
 697
 698        /* Allocate small buffers */
 699        skb_queue_head_init(&card->sbpool.queue);
 700        card->sbpool.count = 0; /* Not used */
 701        for (j = 0; j < NUM_SB; j++) {
 702                struct sk_buff *sb;
 703                sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
 704                if (sb == NULL) {
 705                        printk
 706                            ("nicstar%d: can't allocate %dth of %d small buffers.\n",
 707                             i, j, NUM_SB);
 708                        error = 15;
 709                        ns_init_card_error(card, error);
 710                        return error;
 711                }
 712                NS_PRV_BUFTYPE(sb) = BUF_SM;
 713                skb_queue_tail(&card->sbpool.queue, sb);
 714                skb_reserve(sb, NS_AAL0_HEADER);
 715                push_rxbufs(card, sb);
 716        }
 717        /* Test for strange behaviour which leads to crashes */
 718        if ((bcount =
 719             ns_stat_sfbqc_get(readl(card->membase + STAT))) < card->sbnr.min) {
 720                printk
 721                    ("nicstar%d: Strange... Just allocated %d small buffers and sfbqc = %d.\n",
 722                     i, j, bcount);
 723                error = 15;
 724                ns_init_card_error(card, error);
 725                return error;
 726        }
 727
 728        /* Allocate iovec buffers */
 729        skb_queue_head_init(&card->iovpool.queue);
 730        card->iovpool.count = 0;
 731        for (j = 0; j < NUM_IOVB; j++) {
 732                struct sk_buff *iovb;
 733                iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
 734                if (iovb == NULL) {
 735                        printk
 736                            ("nicstar%d: can't allocate %dth of %d iovec buffers.\n",
 737                             i, j, NUM_IOVB);
 738                        error = 16;
 739                        ns_init_card_error(card, error);
 740                        return error;
 741                }
 742                NS_PRV_BUFTYPE(iovb) = BUF_NONE;
 743                skb_queue_tail(&card->iovpool.queue, iovb);
 744                card->iovpool.count++;
 745        }
 746
 747        /* Configure NICStAR */
 748        if (card->rct_size == 4096)
 749                ns_cfg_rctsize = NS_CFG_RCTSIZE_4096_ENTRIES;
 750        else                    /* (card->rct_size == 16384) */
 751                ns_cfg_rctsize = NS_CFG_RCTSIZE_16384_ENTRIES;
 752
 753        card->efbie = 1;
 754
 755        card->intcnt = 0;
 756        if (request_irq
 757            (pcidev->irq, &ns_irq_handler, IRQF_SHARED, "nicstar", card) != 0) {
 758                printk("nicstar%d: can't allocate IRQ %d.\n", i, pcidev->irq);
 759                error = 9;
 760                ns_init_card_error(card, error);
 761                return error;
 762        }
 763
 764        /* Register device */
 765        card->atmdev = atm_dev_register("nicstar", &card->pcidev->dev, &atm_ops,
 766                                        -1, NULL);
 767        if (card->atmdev == NULL) {
 768                printk("nicstar%d: can't register device.\n", i);
 769                error = 17;
 770                ns_init_card_error(card, error);
 771                return error;
 772        }
 773
 774        if (mac[i] == NULL || !mac_pton(mac[i], card->atmdev->esi)) {
 775                nicstar_read_eprom(card->membase, NICSTAR_EPROM_MAC_ADDR_OFFSET,
 776                                   card->atmdev->esi, 6);
 777                if (ether_addr_equal(card->atmdev->esi, "\x00\x00\x00\x00\x00\x00")) {
 778                        nicstar_read_eprom(card->membase,
 779                                           NICSTAR_EPROM_MAC_ADDR_OFFSET_ALT,
 780                                           card->atmdev->esi, 6);
 781                }
 782        }
 783
 784        printk("nicstar%d: MAC address %pM\n", i, card->atmdev->esi);
 785
 786        card->atmdev->dev_data = card;
 787        card->atmdev->ci_range.vpi_bits = card->vpibits;
 788        card->atmdev->ci_range.vci_bits = card->vcibits;
 789        card->atmdev->link_rate = card->max_pcr;
 790        card->atmdev->phy = NULL;
 791
 792#ifdef CONFIG_ATM_NICSTAR_USE_SUNI
 793        if (card->max_pcr == ATM_OC3_PCR)
 794                suni_init(card->atmdev);
 795#endif /* CONFIG_ATM_NICSTAR_USE_SUNI */
 796
 797#ifdef CONFIG_ATM_NICSTAR_USE_IDT77105
 798        if (card->max_pcr == ATM_25_PCR)
 799                idt77105_init(card->atmdev);
 800#endif /* CONFIG_ATM_NICSTAR_USE_IDT77105 */
 801
 802        if (card->atmdev->phy && card->atmdev->phy->start)
 803                card->atmdev->phy->start(card->atmdev);
 804
 805        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 */
 806               NS_CFG_RSQAFIE | NS_CFG_TXEN | NS_CFG_TXIE | NS_CFG_TSQFIE_OPT | /* Only enabled if ENABLE_TSQFIE */
 807               NS_CFG_PHYIE, card->membase + CFG);
 808
 809        num_cards++;
 810
 811        return error;
 812}
 813
 814static void ns_init_card_error(ns_dev *card, int error)
 815{
 816        if (error >= 17) {
 817                writel(0x00000000, card->membase + CFG);
 818        }
 819        if (error >= 16) {
 820                struct sk_buff *iovb;
 821                while ((iovb = skb_dequeue(&card->iovpool.queue)) != NULL)
 822                        dev_kfree_skb_any(iovb);
 823        }
 824        if (error >= 15) {
 825                struct sk_buff *sb;
 826                while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
 827                        dev_kfree_skb_any(sb);
 828                free_scq(card, card->scq0, NULL);
 829        }
 830        if (error >= 14) {
 831                struct sk_buff *lb;
 832                while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
 833                        dev_kfree_skb_any(lb);
 834        }
 835        if (error >= 13) {
 836                struct sk_buff *hb;
 837                while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL)
 838                        dev_kfree_skb_any(hb);
 839        }
 840        if (error >= 12) {
 841                kfree(card->rsq.org);
 842        }
 843        if (error >= 11) {
 844                kfree(card->tsq.org);
 845        }
 846        if (error >= 10) {
 847                free_irq(card->pcidev->irq, card);
 848        }
 849        if (error >= 4) {
 850                iounmap(card->membase);
 851        }
 852        if (error >= 3) {
 853                pci_disable_device(card->pcidev);
 854                kfree(card);
 855        }
 856}
 857
 858static scq_info *get_scq(ns_dev *card, int size, u32 scd)
 859{
 860        scq_info *scq;
 861        int i;
 862
 863        if (size != VBR_SCQSIZE && size != CBR_SCQSIZE)
 864                return NULL;
 865
 866        scq = kmalloc(sizeof(*scq), GFP_KERNEL);
 867        if (!scq)
 868                return NULL;
 869        scq->org = dma_alloc_coherent(&card->pcidev->dev,
 870                                      2 * size,  &scq->dma, GFP_KERNEL);
 871        if (!scq->org) {
 872                kfree(scq);
 873                return NULL;
 874        }
 875        scq->skb = kmalloc_array(size / NS_SCQE_SIZE,
 876                                 sizeof(*scq->skb),
 877                                 GFP_KERNEL);
 878        if (!scq->skb) {
 879                dma_free_coherent(&card->pcidev->dev,
 880                                  2 * size, scq->org, scq->dma);
 881                kfree(scq);
 882                return NULL;
 883        }
 884        scq->num_entries = size / NS_SCQE_SIZE;
 885        scq->base = PTR_ALIGN(scq->org, size);
 886        scq->next = scq->base;
 887        scq->last = scq->base + (scq->num_entries - 1);
 888        scq->tail = scq->last;
 889        scq->scd = scd;
 890        scq->num_entries = size / NS_SCQE_SIZE;
 891        scq->tbd_count = 0;
 892        init_waitqueue_head(&scq->scqfull_waitq);
 893        scq->full = 0;
 894        spin_lock_init(&scq->lock);
 895
 896        for (i = 0; i < scq->num_entries; i++)
 897                scq->skb[i] = NULL;
 898
 899        return scq;
 900}
 901
 902/* For variable rate SCQ vcc must be NULL */
 903static void free_scq(ns_dev *card, scq_info *scq, struct atm_vcc *vcc)
 904{
 905        int i;
 906
 907        if (scq->num_entries == VBR_SCQ_NUM_ENTRIES)
 908                for (i = 0; i < scq->num_entries; i++) {
 909                        if (scq->skb[i] != NULL) {
 910                                vcc = ATM_SKB(scq->skb[i])->vcc;
 911                                if (vcc->pop != NULL)
 912                                        vcc->pop(vcc, scq->skb[i]);
 913                                else
 914                                        dev_kfree_skb_any(scq->skb[i]);
 915                        }
 916        } else {                /* vcc must be != NULL */
 917
 918                if (vcc == NULL) {
 919                        printk
 920                            ("nicstar: free_scq() called with vcc == NULL for fixed rate scq.");
 921                        for (i = 0; i < scq->num_entries; i++)
 922                                dev_kfree_skb_any(scq->skb[i]);
 923                } else
 924                        for (i = 0; i < scq->num_entries; i++) {
 925                                if (scq->skb[i] != NULL) {
 926                                        if (vcc->pop != NULL)
 927                                                vcc->pop(vcc, scq->skb[i]);
 928                                        else
 929                                                dev_kfree_skb_any(scq->skb[i]);
 930                                }
 931                        }
 932        }
 933        kfree(scq->skb);
 934        dma_free_coherent(&card->pcidev->dev,
 935                          2 * (scq->num_entries == VBR_SCQ_NUM_ENTRIES ?
 936                               VBR_SCQSIZE : CBR_SCQSIZE),
 937                          scq->org, scq->dma);
 938        kfree(scq);
 939}
 940
 941/* The handles passed must be pointers to the sk_buff containing the small
 942   or large buffer(s) cast to u32. */
 943static void push_rxbufs(ns_dev * card, struct sk_buff *skb)
 944{
 945        struct sk_buff *handle1, *handle2;
 946        int id1, id2;
 947        u32 addr1, addr2;
 948        u32 stat;
 949        unsigned long flags;
 950
 951        /* *BARF* */
 952        handle2 = NULL;
 953        addr2 = 0;
 954        handle1 = skb;
 955        addr1 = dma_map_single(&card->pcidev->dev,
 956                               skb->data,
 957                               (NS_PRV_BUFTYPE(skb) == BUF_SM
 958                                ? NS_SMSKBSIZE : NS_LGSKBSIZE),
 959                               DMA_TO_DEVICE);
 960        NS_PRV_DMA(skb) = addr1; /* save so we can unmap later */
 961
 962#ifdef GENERAL_DEBUG
 963        if (!addr1)
 964                printk("nicstar%d: push_rxbufs called with addr1 = 0.\n",
 965                       card->index);
 966#endif /* GENERAL_DEBUG */
 967
 968        stat = readl(card->membase + STAT);
 969        card->sbfqc = ns_stat_sfbqc_get(stat);
 970        card->lbfqc = ns_stat_lfbqc_get(stat);
 971        if (NS_PRV_BUFTYPE(skb) == BUF_SM) {
 972                if (!addr2) {
 973                        if (card->sm_addr) {
 974                                addr2 = card->sm_addr;
 975                                handle2 = card->sm_handle;
 976                                card->sm_addr = 0x00000000;
 977                                card->sm_handle = NULL;
 978                        } else {        /* (!sm_addr) */
 979
 980                                card->sm_addr = addr1;
 981                                card->sm_handle = handle1;
 982                        }
 983                }
 984        } else {                /* buf_type == BUF_LG */
 985
 986                if (!addr2) {
 987                        if (card->lg_addr) {
 988                                addr2 = card->lg_addr;
 989                                handle2 = card->lg_handle;
 990                                card->lg_addr = 0x00000000;
 991                                card->lg_handle = NULL;
 992                        } else {        /* (!lg_addr) */
 993
 994                                card->lg_addr = addr1;
 995                                card->lg_handle = handle1;
 996                        }
 997                }
 998        }
 999
1000        if (addr2) {
1001                if (NS_PRV_BUFTYPE(skb) == BUF_SM) {
1002                        if (card->sbfqc >= card->sbnr.max) {
1003                                skb_unlink(handle1, &card->sbpool.queue);
1004                                dev_kfree_skb_any(handle1);
1005                                skb_unlink(handle2, &card->sbpool.queue);
1006                                dev_kfree_skb_any(handle2);
1007                                return;
1008                        } else
1009                                card->sbfqc += 2;
1010                } else {        /* (buf_type == BUF_LG) */
1011
1012                        if (card->lbfqc >= card->lbnr.max) {
1013                                skb_unlink(handle1, &card->lbpool.queue);
1014                                dev_kfree_skb_any(handle1);
1015                                skb_unlink(handle2, &card->lbpool.queue);
1016                                dev_kfree_skb_any(handle2);
1017                                return;
1018                        } else
1019                                card->lbfqc += 2;
1020                }
1021
1022                id1 = idr_alloc(&card->idr, handle1, 0, 0, GFP_ATOMIC);
1023                if (id1 < 0)
1024                        goto out;
1025
1026                id2 = idr_alloc(&card->idr, handle2, 0, 0, GFP_ATOMIC);
1027                if (id2 < 0)
1028                        goto out;
1029
1030                spin_lock_irqsave(&card->res_lock, flags);
1031                while (CMD_BUSY(card)) ;
1032                writel(addr2, card->membase + DR3);
1033                writel(id2, card->membase + DR2);
1034                writel(addr1, card->membase + DR1);
1035                writel(id1, card->membase + DR0);
1036                writel(NS_CMD_WRITE_FREEBUFQ | NS_PRV_BUFTYPE(skb),
1037                       card->membase + CMD);
1038                spin_unlock_irqrestore(&card->res_lock, flags);
1039
1040                XPRINTK("nicstar%d: Pushing %s buffers at 0x%x and 0x%x.\n",
1041                        card->index,
1042                        (NS_PRV_BUFTYPE(skb) == BUF_SM ? "small" : "large"),
1043                        addr1, addr2);
1044        }
1045
1046        if (!card->efbie && card->sbfqc >= card->sbnr.min &&
1047            card->lbfqc >= card->lbnr.min) {
1048                card->efbie = 1;
1049                writel((readl(card->membase + CFG) | NS_CFG_EFBIE),
1050                       card->membase + CFG);
1051        }
1052
1053out:
1054        return;
1055}
1056
1057static irqreturn_t ns_irq_handler(int irq, void *dev_id)
1058{
1059        u32 stat_r;
1060        ns_dev *card;
1061        struct atm_dev *dev;
1062        unsigned long flags;
1063
1064        card = (ns_dev *) dev_id;
1065        dev = card->atmdev;
1066        card->intcnt++;
1067
1068        PRINTK("nicstar%d: NICStAR generated an interrupt\n", card->index);
1069
1070        spin_lock_irqsave(&card->int_lock, flags);
1071
1072        stat_r = readl(card->membase + STAT);
1073
1074        /* Transmit Status Indicator has been written to T. S. Queue */
1075        if (stat_r & NS_STAT_TSIF) {
1076                TXPRINTK("nicstar%d: TSI interrupt\n", card->index);
1077                process_tsq(card);
1078                writel(NS_STAT_TSIF, card->membase + STAT);
1079        }
1080
1081        /* Incomplete CS-PDU has been transmitted */
1082        if (stat_r & NS_STAT_TXICP) {
1083                writel(NS_STAT_TXICP, card->membase + STAT);
1084                TXPRINTK("nicstar%d: Incomplete CS-PDU transmitted.\n",
1085                         card->index);
1086        }
1087
1088        /* Transmit Status Queue 7/8 full */
1089        if (stat_r & NS_STAT_TSQF) {
1090                writel(NS_STAT_TSQF, card->membase + STAT);
1091                PRINTK("nicstar%d: TSQ full.\n", card->index);
1092                process_tsq(card);
1093        }
1094
1095        /* Timer overflow */
1096        if (stat_r & NS_STAT_TMROF) {
1097                writel(NS_STAT_TMROF, card->membase + STAT);
1098                PRINTK("nicstar%d: Timer overflow.\n", card->index);
1099        }
1100
1101        /* PHY device interrupt signal active */
1102        if (stat_r & NS_STAT_PHYI) {
1103                writel(NS_STAT_PHYI, card->membase + STAT);
1104                PRINTK("nicstar%d: PHY interrupt.\n", card->index);
1105                if (dev->phy && dev->phy->interrupt) {
1106                        dev->phy->interrupt(dev);
1107                }
1108        }
1109
1110        /* Small Buffer Queue is full */
1111        if (stat_r & NS_STAT_SFBQF) {
1112                writel(NS_STAT_SFBQF, card->membase + STAT);
1113                printk("nicstar%d: Small free buffer queue is full.\n",
1114                       card->index);
1115        }
1116
1117        /* Large Buffer Queue is full */
1118        if (stat_r & NS_STAT_LFBQF) {
1119                writel(NS_STAT_LFBQF, card->membase + STAT);
1120                printk("nicstar%d: Large free buffer queue is full.\n",
1121                       card->index);
1122        }
1123
1124        /* Receive Status Queue is full */
1125        if (stat_r & NS_STAT_RSQF) {
1126                writel(NS_STAT_RSQF, card->membase + STAT);
1127                printk("nicstar%d: RSQ full.\n", card->index);
1128                process_rsq(card);
1129        }
1130
1131        /* Complete CS-PDU received */
1132        if (stat_r & NS_STAT_EOPDU) {
1133                RXPRINTK("nicstar%d: End of CS-PDU received.\n", card->index);
1134                process_rsq(card);
1135                writel(NS_STAT_EOPDU, card->membase + STAT);
1136        }
1137
1138        /* Raw cell received */
1139        if (stat_r & NS_STAT_RAWCF) {
1140                writel(NS_STAT_RAWCF, card->membase + STAT);
1141#ifndef RCQ_SUPPORT
1142                printk("nicstar%d: Raw cell received and no support yet...\n",
1143                       card->index);
1144#endif /* RCQ_SUPPORT */
1145                /* NOTE: the following procedure may keep a raw cell pending until the
1146                   next interrupt. As this preliminary support is only meant to
1147                   avoid buffer leakage, this is not an issue. */
1148                while (readl(card->membase + RAWCT) != card->rawch) {
1149
1150                        if (ns_rcqe_islast(card->rawcell)) {
1151                                struct sk_buff *oldbuf;
1152
1153                                oldbuf = card->rcbuf;
1154                                card->rcbuf = idr_find(&card->idr,
1155                                                       ns_rcqe_nextbufhandle(card->rawcell));
1156                                card->rawch = NS_PRV_DMA(card->rcbuf);
1157                                card->rawcell = (struct ns_rcqe *)
1158                                                card->rcbuf->data;
1159                                recycle_rx_buf(card, oldbuf);
1160                        } else {
1161                                card->rawch += NS_RCQE_SIZE;
1162                                card->rawcell++;
1163                        }
1164                }
1165        }
1166
1167        /* Small buffer queue is empty */
1168        if (stat_r & NS_STAT_SFBQE) {
1169                int i;
1170                struct sk_buff *sb;
1171
1172                writel(NS_STAT_SFBQE, card->membase + STAT);
1173                printk("nicstar%d: Small free buffer queue empty.\n",
1174                       card->index);
1175                for (i = 0; i < card->sbnr.min; i++) {
1176                        sb = dev_alloc_skb(NS_SMSKBSIZE);
1177                        if (sb == NULL) {
1178                                writel(readl(card->membase + CFG) &
1179                                       ~NS_CFG_EFBIE, card->membase + CFG);
1180                                card->efbie = 0;
1181                                break;
1182                        }
1183                        NS_PRV_BUFTYPE(sb) = BUF_SM;
1184                        skb_queue_tail(&card->sbpool.queue, sb);
1185                        skb_reserve(sb, NS_AAL0_HEADER);
1186                        push_rxbufs(card, sb);
1187                }
1188                card->sbfqc = i;
1189                process_rsq(card);
1190        }
1191
1192        /* Large buffer queue empty */
1193        if (stat_r & NS_STAT_LFBQE) {
1194                int i;
1195                struct sk_buff *lb;
1196
1197                writel(NS_STAT_LFBQE, card->membase + STAT);
1198                printk("nicstar%d: Large free buffer queue empty.\n",
1199                       card->index);
1200                for (i = 0; i < card->lbnr.min; i++) {
1201                        lb = dev_alloc_skb(NS_LGSKBSIZE);
1202                        if (lb == NULL) {
1203                                writel(readl(card->membase + CFG) &
1204                                       ~NS_CFG_EFBIE, card->membase + CFG);
1205                                card->efbie = 0;
1206                                break;
1207                        }
1208                        NS_PRV_BUFTYPE(lb) = BUF_LG;
1209                        skb_queue_tail(&card->lbpool.queue, lb);
1210                        skb_reserve(lb, NS_SMBUFSIZE);
1211                        push_rxbufs(card, lb);
1212                }
1213                card->lbfqc = i;
1214                process_rsq(card);
1215        }
1216
1217        /* Receive Status Queue is 7/8 full */
1218        if (stat_r & NS_STAT_RSQAF) {
1219                writel(NS_STAT_RSQAF, card->membase + STAT);
1220                RXPRINTK("nicstar%d: RSQ almost full.\n", card->index);
1221                process_rsq(card);
1222        }
1223
1224        spin_unlock_irqrestore(&card->int_lock, flags);
1225        PRINTK("nicstar%d: end of interrupt service\n", card->index);
1226        return IRQ_HANDLED;
1227}
1228
1229static int ns_open(struct atm_vcc *vcc)
1230{
1231        ns_dev *card;
1232        vc_map *vc;
1233        unsigned long tmpl, modl;
1234        int tcr, tcra;          /* target cell rate, and absolute value */
1235        int n = 0;              /* Number of entries in the TST. Initialized to remove
1236                                   the compiler warning. */
1237        u32 u32d[4];
1238        int frscdi = 0;         /* Index of the SCD. Initialized to remove the compiler
1239                                   warning. How I wish compilers were clever enough to
1240                                   tell which variables can truly be used
1241                                   uninitialized... */
1242        int inuse;              /* tx or rx vc already in use by another vcc */
1243        short vpi = vcc->vpi;
1244        int vci = vcc->vci;
1245
1246        card = (ns_dev *) vcc->dev->dev_data;
1247        PRINTK("nicstar%d: opening vpi.vci %d.%d \n", card->index, (int)vpi,
1248               vci);
1249        if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0) {
1250                PRINTK("nicstar%d: unsupported AAL.\n", card->index);
1251                return -EINVAL;
1252        }
1253
1254        vc = &(card->vcmap[vpi << card->vcibits | vci]);
1255        vcc->dev_data = vc;
1256
1257        inuse = 0;
1258        if (vcc->qos.txtp.traffic_class != ATM_NONE && vc->tx)
1259                inuse = 1;
1260        if (vcc->qos.rxtp.traffic_class != ATM_NONE && vc->rx)
1261                inuse += 2;
1262        if (inuse) {
1263                printk("nicstar%d: %s vci already in use.\n", card->index,
1264                       inuse == 1 ? "tx" : inuse == 2 ? "rx" : "tx and rx");
1265                return -EINVAL;
1266        }
1267
1268        set_bit(ATM_VF_ADDR, &vcc->flags);
1269
1270        /* NOTE: You are not allowed to modify an open connection's QOS. To change
1271           that, remove the ATM_VF_PARTIAL flag checking. There may be other changes
1272           needed to do that. */
1273        if (!test_bit(ATM_VF_PARTIAL, &vcc->flags)) {
1274                scq_info *scq;
1275
1276                set_bit(ATM_VF_PARTIAL, &vcc->flags);
1277                if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1278                        /* Check requested cell rate and availability of SCD */
1279                        if (vcc->qos.txtp.max_pcr == 0 && vcc->qos.txtp.pcr == 0
1280                            && vcc->qos.txtp.min_pcr == 0) {
1281                                PRINTK
1282                                    ("nicstar%d: trying to open a CBR vc with cell rate = 0 \n",
1283                                     card->index);
1284                                clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1285                                clear_bit(ATM_VF_ADDR, &vcc->flags);
1286                                return -EINVAL;
1287                        }
1288
1289                        tcr = atm_pcr_goal(&(vcc->qos.txtp));
1290                        tcra = tcr >= 0 ? tcr : -tcr;
1291
1292                        PRINTK("nicstar%d: target cell rate = %d.\n",
1293                               card->index, vcc->qos.txtp.max_pcr);
1294
1295                        tmpl =
1296                            (unsigned long)tcra *(unsigned long)
1297                            NS_TST_NUM_ENTRIES;
1298                        modl = tmpl % card->max_pcr;
1299
1300                        n = (int)(tmpl / card->max_pcr);
1301                        if (tcr > 0) {
1302                                if (modl > 0)
1303                                        n++;
1304                        } else if (tcr == 0) {
1305                                if ((n =
1306                                     (card->tst_free_entries -
1307                                      NS_TST_RESERVED)) <= 0) {
1308                                        PRINTK
1309                                            ("nicstar%d: no CBR bandwidth free.\n",
1310                                             card->index);
1311                                        clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1312                                        clear_bit(ATM_VF_ADDR, &vcc->flags);
1313                                        return -EINVAL;
1314                                }
1315                        }
1316
1317                        if (n == 0) {
1318                                printk
1319                                    ("nicstar%d: selected bandwidth < granularity.\n",
1320                                     card->index);
1321                                clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1322                                clear_bit(ATM_VF_ADDR, &vcc->flags);
1323                                return -EINVAL;
1324                        }
1325
1326                        if (n > (card->tst_free_entries - NS_TST_RESERVED)) {
1327                                PRINTK
1328                                    ("nicstar%d: not enough free CBR bandwidth.\n",
1329                                     card->index);
1330                                clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1331                                clear_bit(ATM_VF_ADDR, &vcc->flags);
1332                                return -EINVAL;
1333                        } else
1334                                card->tst_free_entries -= n;
1335
1336                        XPRINTK("nicstar%d: writing %d tst entries.\n",
1337                                card->index, n);
1338                        for (frscdi = 0; frscdi < NS_FRSCD_NUM; frscdi++) {
1339                                if (card->scd2vc[frscdi] == NULL) {
1340                                        card->scd2vc[frscdi] = vc;
1341                                        break;
1342                                }
1343                        }
1344                        if (frscdi == NS_FRSCD_NUM) {
1345                                PRINTK
1346                                    ("nicstar%d: no SCD available for CBR channel.\n",
1347                                     card->index);
1348                                card->tst_free_entries += n;
1349                                clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1350                                clear_bit(ATM_VF_ADDR, &vcc->flags);
1351                                return -EBUSY;
1352                        }
1353
1354                        vc->cbr_scd = NS_FRSCD + frscdi * NS_FRSCD_SIZE;
1355
1356                        scq = get_scq(card, CBR_SCQSIZE, vc->cbr_scd);
1357                        if (scq == NULL) {
1358                                PRINTK("nicstar%d: can't get fixed rate SCQ.\n",
1359                                       card->index);
1360                                card->scd2vc[frscdi] = NULL;
1361                                card->tst_free_entries += n;
1362                                clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1363                                clear_bit(ATM_VF_ADDR, &vcc->flags);
1364                                return -ENOMEM;
1365                        }
1366                        vc->scq = scq;
1367                        u32d[0] = scq_virt_to_bus(scq, scq->base);
1368                        u32d[1] = (u32) 0x00000000;
1369                        u32d[2] = (u32) 0xffffffff;
1370                        u32d[3] = (u32) 0x00000000;
1371                        ns_write_sram(card, vc->cbr_scd, u32d, 4);
1372
1373                        fill_tst(card, n, vc);
1374                } else if (vcc->qos.txtp.traffic_class == ATM_UBR) {
1375                        vc->cbr_scd = 0x00000000;
1376                        vc->scq = card->scq0;
1377                }
1378
1379                if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1380                        vc->tx = 1;
1381                        vc->tx_vcc = vcc;
1382                        vc->tbd_count = 0;
1383                }
1384                if (vcc->qos.rxtp.traffic_class != ATM_NONE) {
1385                        u32 status;
1386
1387                        vc->rx = 1;
1388                        vc->rx_vcc = vcc;
1389                        vc->rx_iov = NULL;
1390
1391                        /* Open the connection in hardware */
1392                        if (vcc->qos.aal == ATM_AAL5)
1393                                status = NS_RCTE_AAL5 | NS_RCTE_CONNECTOPEN;
1394                        else    /* vcc->qos.aal == ATM_AAL0 */
1395                                status = NS_RCTE_AAL0 | NS_RCTE_CONNECTOPEN;
1396#ifdef RCQ_SUPPORT
1397                        status |= NS_RCTE_RAWCELLINTEN;
1398#endif /* RCQ_SUPPORT */
1399                        ns_write_sram(card,
1400                                      NS_RCT +
1401                                      (vpi << card->vcibits | vci) *
1402                                      NS_RCT_ENTRY_SIZE, &status, 1);
1403                }
1404
1405        }
1406
1407        set_bit(ATM_VF_READY, &vcc->flags);
1408        return 0;
1409}
1410
1411static void ns_close(struct atm_vcc *vcc)
1412{
1413        vc_map *vc;
1414        ns_dev *card;
1415        u32 data;
1416        int i;
1417
1418        vc = vcc->dev_data;
1419        card = vcc->dev->dev_data;
1420        PRINTK("nicstar%d: closing vpi.vci %d.%d \n", card->index,
1421               (int)vcc->vpi, vcc->vci);
1422
1423        clear_bit(ATM_VF_READY, &vcc->flags);
1424
1425        if (vcc->qos.rxtp.traffic_class != ATM_NONE) {
1426                u32 addr;
1427                unsigned long flags;
1428
1429                addr =
1430                    NS_RCT +
1431                    (vcc->vpi << card->vcibits | vcc->vci) * NS_RCT_ENTRY_SIZE;
1432                spin_lock_irqsave(&card->res_lock, flags);
1433                while (CMD_BUSY(card)) ;
1434                writel(NS_CMD_CLOSE_CONNECTION | addr << 2,
1435                       card->membase + CMD);
1436                spin_unlock_irqrestore(&card->res_lock, flags);
1437
1438                vc->rx = 0;
1439                if (vc->rx_iov != NULL) {
1440                        struct sk_buff *iovb;
1441                        u32 stat;
1442
1443                        stat = readl(card->membase + STAT);
1444                        card->sbfqc = ns_stat_sfbqc_get(stat);
1445                        card->lbfqc = ns_stat_lfbqc_get(stat);
1446
1447                        PRINTK
1448                            ("nicstar%d: closing a VC with pending rx buffers.\n",
1449                             card->index);
1450                        iovb = vc->rx_iov;
1451                        recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
1452                                              NS_PRV_IOVCNT(iovb));
1453                        NS_PRV_IOVCNT(iovb) = 0;
1454                        spin_lock_irqsave(&card->int_lock, flags);
1455                        recycle_iov_buf(card, iovb);
1456                        spin_unlock_irqrestore(&card->int_lock, flags);
1457                        vc->rx_iov = NULL;
1458                }
1459        }
1460
1461        if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1462                vc->tx = 0;
1463        }
1464
1465        if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1466                unsigned long flags;
1467                ns_scqe *scqep;
1468                scq_info *scq;
1469
1470                scq = vc->scq;
1471
1472                for (;;) {
1473                        spin_lock_irqsave(&scq->lock, flags);
1474                        scqep = scq->next;
1475                        if (scqep == scq->base)
1476                                scqep = scq->last;
1477                        else
1478                                scqep--;
1479                        if (scqep == scq->tail) {
1480                                spin_unlock_irqrestore(&scq->lock, flags);
1481                                break;
1482                        }
1483                        /* If the last entry is not a TSR, place one in the SCQ in order to
1484                           be able to completely drain it and then close. */
1485                        if (!ns_scqe_is_tsr(scqep) && scq->tail != scq->next) {
1486                                ns_scqe tsr;
1487                                u32 scdi, scqi;
1488                                u32 data;
1489                                int index;
1490
1491                                tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
1492                                scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
1493                                scqi = scq->next - scq->base;
1494                                tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
1495                                tsr.word_3 = 0x00000000;
1496                                tsr.word_4 = 0x00000000;
1497                                *scq->next = tsr;
1498                                index = (int)scqi;
1499                                scq->skb[index] = NULL;
1500                                if (scq->next == scq->last)
1501                                        scq->next = scq->base;
1502                                else
1503                                        scq->next++;
1504                                data = scq_virt_to_bus(scq, scq->next);
1505                                ns_write_sram(card, scq->scd, &data, 1);
1506                        }
1507                        spin_unlock_irqrestore(&scq->lock, flags);
1508                        schedule();
1509                }
1510
1511                /* Free all TST entries */
1512                data = NS_TST_OPCODE_VARIABLE;
1513                for (i = 0; i < NS_TST_NUM_ENTRIES; i++) {
1514                        if (card->tste2vc[i] == vc) {
1515                                ns_write_sram(card, card->tst_addr + i, &data,
1516                                              1);
1517                                card->tste2vc[i] = NULL;
1518                                card->tst_free_entries++;
1519                        }
1520                }
1521
1522                card->scd2vc[(vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE] = NULL;
1523                free_scq(card, vc->scq, vcc);
1524        }
1525
1526        /* remove all references to vcc before deleting it */
1527        if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1528                unsigned long flags;
1529                scq_info *scq = card->scq0;
1530
1531                spin_lock_irqsave(&scq->lock, flags);
1532
1533                for (i = 0; i < scq->num_entries; i++) {
1534                        if (scq->skb[i] && ATM_SKB(scq->skb[i])->vcc == vcc) {
1535                                ATM_SKB(scq->skb[i])->vcc = NULL;
1536                                atm_return(vcc, scq->skb[i]->truesize);
1537                                PRINTK
1538                                    ("nicstar: deleted pending vcc mapping\n");
1539                        }
1540                }
1541
1542                spin_unlock_irqrestore(&scq->lock, flags);
1543        }
1544
1545        vcc->dev_data = NULL;
1546        clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1547        clear_bit(ATM_VF_ADDR, &vcc->flags);
1548
1549#ifdef RX_DEBUG
1550        {
1551                u32 stat, cfg;
1552                stat = readl(card->membase + STAT);
1553                cfg = readl(card->membase + CFG);
1554                printk("STAT = 0x%08X  CFG = 0x%08X  \n", stat, cfg);
1555                printk
1556                    ("TSQ: base = 0x%p  next = 0x%p  last = 0x%p  TSQT = 0x%08X \n",
1557                     card->tsq.base, card->tsq.next,
1558                     card->tsq.last, readl(card->membase + TSQT));
1559                printk
1560                    ("RSQ: base = 0x%p  next = 0x%p  last = 0x%p  RSQT = 0x%08X \n",
1561                     card->rsq.base, card->rsq.next,
1562                     card->rsq.last, readl(card->membase + RSQT));
1563                printk("Empty free buffer queue interrupt %s \n",
1564                       card->efbie ? "enabled" : "disabled");
1565                printk("SBCNT = %d  count = %d   LBCNT = %d count = %d \n",
1566                       ns_stat_sfbqc_get(stat), card->sbpool.count,
1567                       ns_stat_lfbqc_get(stat), card->lbpool.count);
1568                printk("hbpool.count = %d  iovpool.count = %d \n",
1569                       card->hbpool.count, card->iovpool.count);
1570        }
1571#endif /* RX_DEBUG */
1572}
1573
1574static void fill_tst(ns_dev * card, int n, vc_map * vc)
1575{
1576        u32 new_tst;
1577        unsigned long cl;
1578        int e, r;
1579        u32 data;
1580
1581        /* It would be very complicated to keep the two TSTs synchronized while
1582           assuring that writes are only made to the inactive TST. So, for now I
1583           will use only one TST. If problems occur, I will change this again */
1584
1585        new_tst = card->tst_addr;
1586
1587        /* Fill procedure */
1588
1589        for (e = 0; e < NS_TST_NUM_ENTRIES; e++) {
1590                if (card->tste2vc[e] == NULL)
1591                        break;
1592        }
1593        if (e == NS_TST_NUM_ENTRIES) {
1594                printk("nicstar%d: No free TST entries found. \n", card->index);
1595                return;
1596        }
1597
1598        r = n;
1599        cl = NS_TST_NUM_ENTRIES;
1600        data = ns_tste_make(NS_TST_OPCODE_FIXED, vc->cbr_scd);
1601
1602        while (r > 0) {
1603                if (cl >= NS_TST_NUM_ENTRIES && card->tste2vc[e] == NULL) {
1604                        card->tste2vc[e] = vc;
1605                        ns_write_sram(card, new_tst + e, &data, 1);
1606                        cl -= NS_TST_NUM_ENTRIES;
1607                        r--;
1608                }
1609
1610                if (++e == NS_TST_NUM_ENTRIES) {
1611                        e = 0;
1612                }
1613                cl += n;
1614        }
1615
1616        /* End of fill procedure */
1617
1618        data = ns_tste_make(NS_TST_OPCODE_END, new_tst);
1619        ns_write_sram(card, new_tst + NS_TST_NUM_ENTRIES, &data, 1);
1620        ns_write_sram(card, card->tst_addr + NS_TST_NUM_ENTRIES, &data, 1);
1621        card->tst_addr = new_tst;
1622}
1623
1624static int ns_send(struct atm_vcc *vcc, struct sk_buff *skb)
1625{
1626        ns_dev *card;
1627        vc_map *vc;
1628        scq_info *scq;
1629        unsigned long buflen;
1630        ns_scqe scqe;
1631        u32 flags;              /* TBD flags, not CPU flags */
1632
1633        card = vcc->dev->dev_data;
1634        TXPRINTK("nicstar%d: ns_send() called.\n", card->index);
1635        if ((vc = (vc_map *) vcc->dev_data) == NULL) {
1636                printk("nicstar%d: vcc->dev_data == NULL on ns_send().\n",
1637                       card->index);
1638                atomic_inc(&vcc->stats->tx_err);
1639                dev_kfree_skb_any(skb);
1640                return -EINVAL;
1641        }
1642
1643        if (!vc->tx) {
1644                printk("nicstar%d: Trying to transmit on a non-tx VC.\n",
1645                       card->index);
1646                atomic_inc(&vcc->stats->tx_err);
1647                dev_kfree_skb_any(skb);
1648                return -EINVAL;
1649        }
1650
1651        if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0) {
1652                printk("nicstar%d: Only AAL0 and AAL5 are supported.\n",
1653                       card->index);
1654                atomic_inc(&vcc->stats->tx_err);
1655                dev_kfree_skb_any(skb);
1656                return -EINVAL;
1657        }
1658
1659        if (skb_shinfo(skb)->nr_frags != 0) {
1660                printk("nicstar%d: No scatter-gather yet.\n", card->index);
1661                atomic_inc(&vcc->stats->tx_err);
1662                dev_kfree_skb_any(skb);
1663                return -EINVAL;
1664        }
1665
1666        ATM_SKB(skb)->vcc = vcc;
1667
1668        NS_PRV_DMA(skb) = dma_map_single(&card->pcidev->dev, skb->data,
1669                                         skb->len, DMA_TO_DEVICE);
1670
1671        if (vcc->qos.aal == ATM_AAL5) {
1672                buflen = (skb->len + 47 + 8) / 48 * 48; /* Multiple of 48 */
1673                flags = NS_TBD_AAL5;
1674                scqe.word_2 = cpu_to_le32(NS_PRV_DMA(skb));
1675                scqe.word_3 = cpu_to_le32(skb->len);
1676                scqe.word_4 =
1677                    ns_tbd_mkword_4(0, (u32) vcc->vpi, (u32) vcc->vci, 0,
1678                                    ATM_SKB(skb)->
1679                                    atm_options & ATM_ATMOPT_CLP ? 1 : 0);
1680                flags |= NS_TBD_EOPDU;
1681        } else {                /* (vcc->qos.aal == ATM_AAL0) */
1682
1683                buflen = ATM_CELL_PAYLOAD;      /* i.e., 48 bytes */
1684                flags = NS_TBD_AAL0;
1685                scqe.word_2 = cpu_to_le32(NS_PRV_DMA(skb) + NS_AAL0_HEADER);
1686                scqe.word_3 = cpu_to_le32(0x00000000);
1687                if (*skb->data & 0x02)  /* Payload type 1 - end of pdu */
1688                        flags |= NS_TBD_EOPDU;
1689                scqe.word_4 =
1690                    cpu_to_le32(*((u32 *) skb->data) & ~NS_TBD_VC_MASK);
1691                /* Force the VPI/VCI to be the same as in VCC struct */
1692                scqe.word_4 |=
1693                    cpu_to_le32((((u32) vcc->
1694                                  vpi) << NS_TBD_VPI_SHIFT | ((u32) vcc->
1695                                                              vci) <<
1696                                 NS_TBD_VCI_SHIFT) & NS_TBD_VC_MASK);
1697        }
1698
1699        if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1700                scqe.word_1 = ns_tbd_mkword_1_novbr(flags, (u32) buflen);
1701                scq = ((vc_map *) vcc->dev_data)->scq;
1702        } else {
1703                scqe.word_1 =
1704                    ns_tbd_mkword_1(flags, (u32) 1, (u32) 1, (u32) buflen);
1705                scq = card->scq0;
1706        }
1707
1708        if (push_scqe(card, vc, scq, &scqe, skb) != 0) {
1709                atomic_inc(&vcc->stats->tx_err);
1710                dev_kfree_skb_any(skb);
1711                return -EIO;
1712        }
1713        atomic_inc(&vcc->stats->tx);
1714
1715        return 0;
1716}
1717
1718static int push_scqe(ns_dev * card, vc_map * vc, scq_info * scq, ns_scqe * tbd,
1719                     struct sk_buff *skb)
1720{
1721        unsigned long flags;
1722        ns_scqe tsr;
1723        u32 scdi, scqi;
1724        int scq_is_vbr;
1725        u32 data;
1726        int index;
1727
1728        spin_lock_irqsave(&scq->lock, flags);
1729        while (scq->tail == scq->next) {
1730                if (in_interrupt()) {
1731                        spin_unlock_irqrestore(&scq->lock, flags);
1732                        printk("nicstar%d: Error pushing TBD.\n", card->index);
1733                        return 1;
1734                }
1735
1736                scq->full = 1;
1737                wait_event_interruptible_lock_irq_timeout(scq->scqfull_waitq,
1738                                                          scq->tail != scq->next,
1739                                                          scq->lock,
1740                                                          SCQFULL_TIMEOUT);
1741
1742                if (scq->full) {
1743                        spin_unlock_irqrestore(&scq->lock, flags);
1744                        printk("nicstar%d: Timeout pushing TBD.\n",
1745                               card->index);
1746                        return 1;
1747                }
1748        }
1749        *scq->next = *tbd;
1750        index = (int)(scq->next - scq->base);
1751        scq->skb[index] = skb;
1752        XPRINTK("nicstar%d: sending skb at 0x%p (pos %d).\n",
1753                card->index, skb, index);
1754        XPRINTK("nicstar%d: TBD written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%p.\n",
1755                card->index, le32_to_cpu(tbd->word_1), le32_to_cpu(tbd->word_2),
1756                le32_to_cpu(tbd->word_3), le32_to_cpu(tbd->word_4),
1757                scq->next);
1758        if (scq->next == scq->last)
1759                scq->next = scq->base;
1760        else
1761                scq->next++;
1762
1763        vc->tbd_count++;
1764        if (scq->num_entries == VBR_SCQ_NUM_ENTRIES) {
1765                scq->tbd_count++;
1766                scq_is_vbr = 1;
1767        } else
1768                scq_is_vbr = 0;
1769
1770        if (vc->tbd_count >= MAX_TBD_PER_VC
1771            || scq->tbd_count >= MAX_TBD_PER_SCQ) {
1772                int has_run = 0;
1773
1774                while (scq->tail == scq->next) {
1775                        if (in_interrupt()) {
1776                                data = scq_virt_to_bus(scq, scq->next);
1777                                ns_write_sram(card, scq->scd, &data, 1);
1778                                spin_unlock_irqrestore(&scq->lock, flags);
1779                                printk("nicstar%d: Error pushing TSR.\n",
1780                                       card->index);
1781                                return 0;
1782                        }
1783
1784                        scq->full = 1;
1785                        if (has_run++)
1786                                break;
1787                        wait_event_interruptible_lock_irq_timeout(scq->scqfull_waitq,
1788                                                                  scq->tail != scq->next,
1789                                                                  scq->lock,
1790                                                                  SCQFULL_TIMEOUT);
1791                }
1792
1793                if (!scq->full) {
1794                        tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
1795                        if (scq_is_vbr)
1796                                scdi = NS_TSR_SCDISVBR;
1797                        else
1798                                scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
1799                        scqi = scq->next - scq->base;
1800                        tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
1801                        tsr.word_3 = 0x00000000;
1802                        tsr.word_4 = 0x00000000;
1803
1804                        *scq->next = tsr;
1805                        index = (int)scqi;
1806                        scq->skb[index] = NULL;
1807                        XPRINTK
1808                            ("nicstar%d: TSR written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%p.\n",
1809                             card->index, le32_to_cpu(tsr.word_1),
1810                             le32_to_cpu(tsr.word_2), le32_to_cpu(tsr.word_3),
1811                             le32_to_cpu(tsr.word_4), scq->next);
1812                        if (scq->next == scq->last)
1813                                scq->next = scq->base;
1814                        else
1815                                scq->next++;
1816                        vc->tbd_count = 0;
1817                        scq->tbd_count = 0;
1818                } else
1819                        PRINTK("nicstar%d: Timeout pushing TSR.\n",
1820                               card->index);
1821        }
1822        data = scq_virt_to_bus(scq, scq->next);
1823        ns_write_sram(card, scq->scd, &data, 1);
1824
1825        spin_unlock_irqrestore(&scq->lock, flags);
1826
1827        return 0;
1828}
1829
1830static void process_tsq(ns_dev * card)
1831{
1832        u32 scdi;
1833        scq_info *scq;
1834        ns_tsi *previous = NULL, *one_ahead, *two_ahead;
1835        int serviced_entries;   /* flag indicating at least on entry was serviced */
1836
1837        serviced_entries = 0;
1838
1839        if (card->tsq.next == card->tsq.last)
1840                one_ahead = card->tsq.base;
1841        else
1842                one_ahead = card->tsq.next + 1;
1843
1844        if (one_ahead == card->tsq.last)
1845                two_ahead = card->tsq.base;
1846        else
1847                two_ahead = one_ahead + 1;
1848
1849        while (!ns_tsi_isempty(card->tsq.next) || !ns_tsi_isempty(one_ahead) ||
1850               !ns_tsi_isempty(two_ahead))
1851                /* At most two empty, as stated in the 77201 errata */
1852        {
1853                serviced_entries = 1;
1854
1855                /* Skip the one or two possible empty entries */
1856                while (ns_tsi_isempty(card->tsq.next)) {
1857                        if (card->tsq.next == card->tsq.last)
1858                                card->tsq.next = card->tsq.base;
1859                        else
1860                                card->tsq.next++;
1861                }
1862
1863                if (!ns_tsi_tmrof(card->tsq.next)) {
1864                        scdi = ns_tsi_getscdindex(card->tsq.next);
1865                        if (scdi == NS_TSI_SCDISVBR)
1866                                scq = card->scq0;
1867                        else {
1868                                if (card->scd2vc[scdi] == NULL) {
1869                                        printk
1870                                            ("nicstar%d: could not find VC from SCD index.\n",
1871                                             card->index);
1872                                        ns_tsi_init(card->tsq.next);
1873                                        return;
1874                                }
1875                                scq = card->scd2vc[scdi]->scq;
1876                        }
1877                        drain_scq(card, scq, ns_tsi_getscqpos(card->tsq.next));
1878                        scq->full = 0;
1879                        wake_up_interruptible(&(scq->scqfull_waitq));
1880                }
1881
1882                ns_tsi_init(card->tsq.next);
1883                previous = card->tsq.next;
1884                if (card->tsq.next == card->tsq.last)
1885                        card->tsq.next = card->tsq.base;
1886                else
1887                        card->tsq.next++;
1888
1889                if (card->tsq.next == card->tsq.last)
1890                        one_ahead = card->tsq.base;
1891                else
1892                        one_ahead = card->tsq.next + 1;
1893
1894                if (one_ahead == card->tsq.last)
1895                        two_ahead = card->tsq.base;
1896                else
1897                        two_ahead = one_ahead + 1;
1898        }
1899
1900        if (serviced_entries)
1901                writel(PTR_DIFF(previous, card->tsq.base),
1902                       card->membase + TSQH);
1903}
1904
1905static void drain_scq(ns_dev * card, scq_info * scq, int pos)
1906{
1907        struct atm_vcc *vcc;
1908        struct sk_buff *skb;
1909        int i;
1910        unsigned long flags;
1911
1912        XPRINTK("nicstar%d: drain_scq() called, scq at 0x%p, pos %d.\n",
1913                card->index, scq, pos);
1914        if (pos >= scq->num_entries) {
1915                printk("nicstar%d: Bad index on drain_scq().\n", card->index);
1916                return;
1917        }
1918
1919        spin_lock_irqsave(&scq->lock, flags);
1920        i = (int)(scq->tail - scq->base);
1921        if (++i == scq->num_entries)
1922                i = 0;
1923        while (i != pos) {
1924                skb = scq->skb[i];
1925                XPRINTK("nicstar%d: freeing skb at 0x%p (index %d).\n",
1926                        card->index, skb, i);
1927                if (skb != NULL) {
1928                        dma_unmap_single(&card->pcidev->dev,
1929                                         NS_PRV_DMA(skb),
1930                                         skb->len,
1931                                         DMA_TO_DEVICE);
1932                        vcc = ATM_SKB(skb)->vcc;
1933                        if (vcc && vcc->pop != NULL) {
1934                                vcc->pop(vcc, skb);
1935                        } else {
1936                                dev_kfree_skb_irq(skb);
1937                        }
1938                        scq->skb[i] = NULL;
1939                }
1940                if (++i == scq->num_entries)
1941                        i = 0;
1942        }
1943        scq->tail = scq->base + pos;
1944        spin_unlock_irqrestore(&scq->lock, flags);
1945}
1946
1947static void process_rsq(ns_dev * card)
1948{
1949        ns_rsqe *previous;
1950
1951        if (!ns_rsqe_valid(card->rsq.next))
1952                return;
1953        do {
1954                dequeue_rx(card, card->rsq.next);
1955                ns_rsqe_init(card->rsq.next);
1956                previous = card->rsq.next;
1957                if (card->rsq.next == card->rsq.last)
1958                        card->rsq.next = card->rsq.base;
1959                else
1960                        card->rsq.next++;
1961        } while (ns_rsqe_valid(card->rsq.next));
1962        writel(PTR_DIFF(previous, card->rsq.base), card->membase + RSQH);
1963}
1964
1965static void dequeue_rx(ns_dev * card, ns_rsqe * rsqe)
1966{
1967        u32 vpi, vci;
1968        vc_map *vc;
1969        struct sk_buff *iovb;
1970        struct iovec *iov;
1971        struct atm_vcc *vcc;
1972        struct sk_buff *skb;
1973        unsigned short aal5_len;
1974        int len;
1975        u32 stat;
1976        u32 id;
1977
1978        stat = readl(card->membase + STAT);
1979        card->sbfqc = ns_stat_sfbqc_get(stat);
1980        card->lbfqc = ns_stat_lfbqc_get(stat);
1981
1982        id = le32_to_cpu(rsqe->buffer_handle);
1983        skb = idr_find(&card->idr, id);
1984        if (!skb) {
1985                RXPRINTK(KERN_ERR
1986                         "nicstar%d: idr_find() failed!\n", card->index);
1987                return;
1988        }
1989        idr_remove(&card->idr, id);
1990        dma_sync_single_for_cpu(&card->pcidev->dev,
1991                                NS_PRV_DMA(skb),
1992                                (NS_PRV_BUFTYPE(skb) == BUF_SM
1993                                 ? NS_SMSKBSIZE : NS_LGSKBSIZE),
1994                                DMA_FROM_DEVICE);
1995        dma_unmap_single(&card->pcidev->dev,
1996                         NS_PRV_DMA(skb),
1997                         (NS_PRV_BUFTYPE(skb) == BUF_SM
1998                          ? NS_SMSKBSIZE : NS_LGSKBSIZE),
1999                         DMA_FROM_DEVICE);
2000        vpi = ns_rsqe_vpi(rsqe);
2001        vci = ns_rsqe_vci(rsqe);
2002        if (vpi >= 1UL << card->vpibits || vci >= 1UL << card->vcibits) {
2003                printk("nicstar%d: SDU received for out-of-range vc %d.%d.\n",
2004                       card->index, vpi, vci);
2005                recycle_rx_buf(card, skb);
2006                return;
2007        }
2008
2009        vc = &(card->vcmap[vpi << card->vcibits | vci]);
2010        if (!vc->rx) {
2011                RXPRINTK("nicstar%d: SDU received on non-rx vc %d.%d.\n",
2012                         card->index, vpi, vci);
2013                recycle_rx_buf(card, skb);
2014                return;
2015        }
2016
2017        vcc = vc->rx_vcc;
2018
2019        if (vcc->qos.aal == ATM_AAL0) {
2020                struct sk_buff *sb;
2021                unsigned char *cell;
2022                int i;
2023
2024                cell = skb->data;
2025                for (i = ns_rsqe_cellcount(rsqe); i; i--) {
2026                        sb = dev_alloc_skb(NS_SMSKBSIZE);
2027                        if (!sb) {
2028                                printk
2029                                    ("nicstar%d: Can't allocate buffers for aal0.\n",
2030                                     card->index);
2031                                atomic_add(i, &vcc->stats->rx_drop);
2032                                break;
2033                        }
2034                        if (!atm_charge(vcc, sb->truesize)) {
2035                                RXPRINTK
2036                                    ("nicstar%d: atm_charge() dropped aal0 packets.\n",
2037                                     card->index);
2038                                atomic_add(i - 1, &vcc->stats->rx_drop);        /* already increased by 1 */
2039                                dev_kfree_skb_any(sb);
2040                                break;
2041                        }
2042                        /* Rebuild the header */
2043                        *((u32 *) sb->data) = le32_to_cpu(rsqe->word_1) << 4 |
2044                            (ns_rsqe_clp(rsqe) ? 0x00000001 : 0x00000000);
2045                        if (i == 1 && ns_rsqe_eopdu(rsqe))
2046                                *((u32 *) sb->data) |= 0x00000002;
2047                        skb_put(sb, NS_AAL0_HEADER);
2048                        memcpy(skb_tail_pointer(sb), cell, ATM_CELL_PAYLOAD);
2049                        skb_put(sb, ATM_CELL_PAYLOAD);
2050                        ATM_SKB(sb)->vcc = vcc;
2051                        __net_timestamp(sb);
2052                        vcc->push(vcc, sb);
2053                        atomic_inc(&vcc->stats->rx);
2054                        cell += ATM_CELL_PAYLOAD;
2055                }
2056
2057                recycle_rx_buf(card, skb);
2058                return;
2059        }
2060
2061        /* To reach this point, the AAL layer can only be AAL5 */
2062
2063        if ((iovb = vc->rx_iov) == NULL) {
2064                iovb = skb_dequeue(&(card->iovpool.queue));
2065                if (iovb == NULL) {     /* No buffers in the queue */
2066                        iovb = alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC);
2067                        if (iovb == NULL) {
2068                                printk("nicstar%d: Out of iovec buffers.\n",
2069                                       card->index);
2070                                atomic_inc(&vcc->stats->rx_drop);
2071                                recycle_rx_buf(card, skb);
2072                                return;
2073                        }
2074                        NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2075                } else if (--card->iovpool.count < card->iovnr.min) {
2076                        struct sk_buff *new_iovb;
2077                        if ((new_iovb =
2078                             alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC)) != NULL) {
2079                                NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2080                                skb_queue_tail(&card->iovpool.queue, new_iovb);
2081                                card->iovpool.count++;
2082                        }
2083                }
2084                vc->rx_iov = iovb;
2085                NS_PRV_IOVCNT(iovb) = 0;
2086                iovb->len = 0;
2087                iovb->data = iovb->head;
2088                skb_reset_tail_pointer(iovb);
2089                /* IMPORTANT: a pointer to the sk_buff containing the small or large
2090                   buffer is stored as iovec base, NOT a pointer to the
2091                   small or large buffer itself. */
2092        } else if (NS_PRV_IOVCNT(iovb) >= NS_MAX_IOVECS) {
2093                printk("nicstar%d: received too big AAL5 SDU.\n", card->index);
2094                atomic_inc(&vcc->stats->rx_err);
2095                recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2096                                      NS_MAX_IOVECS);
2097                NS_PRV_IOVCNT(iovb) = 0;
2098                iovb->len = 0;
2099                iovb->data = iovb->head;
2100                skb_reset_tail_pointer(iovb);
2101        }
2102        iov = &((struct iovec *)iovb->data)[NS_PRV_IOVCNT(iovb)++];
2103        iov->iov_base = (void *)skb;
2104        iov->iov_len = ns_rsqe_cellcount(rsqe) * 48;
2105        iovb->len += iov->iov_len;
2106
2107#ifdef EXTRA_DEBUG
2108        if (NS_PRV_IOVCNT(iovb) == 1) {
2109                if (NS_PRV_BUFTYPE(skb) != BUF_SM) {
2110                        printk
2111                            ("nicstar%d: Expected a small buffer, and this is not one.\n",
2112                             card->index);
2113                        which_list(card, skb);
2114                        atomic_inc(&vcc->stats->rx_err);
2115                        recycle_rx_buf(card, skb);
2116                        vc->rx_iov = NULL;
2117                        recycle_iov_buf(card, iovb);
2118                        return;
2119                }
2120        } else {                /* NS_PRV_IOVCNT(iovb) >= 2 */
2121
2122                if (NS_PRV_BUFTYPE(skb) != BUF_LG) {
2123                        printk
2124                            ("nicstar%d: Expected a large buffer, and this is not one.\n",
2125                             card->index);
2126                        which_list(card, skb);
2127                        atomic_inc(&vcc->stats->rx_err);
2128                        recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2129                                              NS_PRV_IOVCNT(iovb));
2130                        vc->rx_iov = NULL;
2131                        recycle_iov_buf(card, iovb);
2132                        return;
2133                }
2134        }
2135#endif /* EXTRA_DEBUG */
2136
2137        if (ns_rsqe_eopdu(rsqe)) {
2138                /* This works correctly regardless of the endianness of the host */
2139                unsigned char *L1L2 = (unsigned char *)
2140                                                (skb->data + iov->iov_len - 6);
2141                aal5_len = L1L2[0] << 8 | L1L2[1];
2142                len = (aal5_len == 0x0000) ? 0x10000 : aal5_len;
2143                if (ns_rsqe_crcerr(rsqe) ||
2144                    len + 8 > iovb->len || len + (47 + 8) < iovb->len) {
2145                        printk("nicstar%d: AAL5 CRC error", card->index);
2146                        if (len + 8 > iovb->len || len + (47 + 8) < iovb->len)
2147                                printk(" - PDU size mismatch.\n");
2148                        else
2149                                printk(".\n");
2150                        atomic_inc(&vcc->stats->rx_err);
2151                        recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2152                                              NS_PRV_IOVCNT(iovb));
2153                        vc->rx_iov = NULL;
2154                        recycle_iov_buf(card, iovb);
2155                        return;
2156                }
2157
2158                /* By this point we (hopefully) have a complete SDU without errors. */
2159
2160                if (NS_PRV_IOVCNT(iovb) == 1) { /* Just a small buffer */
2161                        /* skb points to a small buffer */
2162                        if (!atm_charge(vcc, skb->truesize)) {
2163                                push_rxbufs(card, skb);
2164                                atomic_inc(&vcc->stats->rx_drop);
2165                        } else {
2166                                skb_put(skb, len);
2167                                dequeue_sm_buf(card, skb);
2168                                ATM_SKB(skb)->vcc = vcc;
2169                                __net_timestamp(skb);
2170                                vcc->push(vcc, skb);
2171                                atomic_inc(&vcc->stats->rx);
2172                        }
2173                } else if (NS_PRV_IOVCNT(iovb) == 2) {  /* One small plus one large buffer */
2174                        struct sk_buff *sb;
2175
2176                        sb = (struct sk_buff *)(iov - 1)->iov_base;
2177                        /* skb points to a large buffer */
2178
2179                        if (len <= NS_SMBUFSIZE) {
2180                                if (!atm_charge(vcc, sb->truesize)) {
2181                                        push_rxbufs(card, sb);
2182                                        atomic_inc(&vcc->stats->rx_drop);
2183                                } else {
2184                                        skb_put(sb, len);
2185                                        dequeue_sm_buf(card, sb);
2186                                        ATM_SKB(sb)->vcc = vcc;
2187                                        __net_timestamp(sb);
2188                                        vcc->push(vcc, sb);
2189                                        atomic_inc(&vcc->stats->rx);
2190                                }
2191
2192                                push_rxbufs(card, skb);
2193
2194                        } else {        /* len > NS_SMBUFSIZE, the usual case */
2195
2196                                if (!atm_charge(vcc, skb->truesize)) {
2197                                        push_rxbufs(card, skb);
2198                                        atomic_inc(&vcc->stats->rx_drop);
2199                                } else {
2200                                        dequeue_lg_buf(card, skb);
2201                                        skb_push(skb, NS_SMBUFSIZE);
2202                                        skb_copy_from_linear_data(sb, skb->data,
2203                                                                  NS_SMBUFSIZE);
2204                                        skb_put(skb, len - NS_SMBUFSIZE);
2205                                        ATM_SKB(skb)->vcc = vcc;
2206                                        __net_timestamp(skb);
2207                                        vcc->push(vcc, skb);
2208                                        atomic_inc(&vcc->stats->rx);
2209                                }
2210
2211                                push_rxbufs(card, sb);
2212
2213                        }
2214
2215                } else {        /* Must push a huge buffer */
2216
2217                        struct sk_buff *hb, *sb, *lb;
2218                        int remaining, tocopy;
2219                        int j;
2220
2221                        hb = skb_dequeue(&(card->hbpool.queue));
2222                        if (hb == NULL) {       /* No buffers in the queue */
2223
2224                                hb = dev_alloc_skb(NS_HBUFSIZE);
2225                                if (hb == NULL) {
2226                                        printk
2227                                            ("nicstar%d: Out of huge buffers.\n",
2228                                             card->index);
2229                                        atomic_inc(&vcc->stats->rx_drop);
2230                                        recycle_iovec_rx_bufs(card,
2231                                                              (struct iovec *)
2232                                                              iovb->data,
2233                                                              NS_PRV_IOVCNT(iovb));
2234                                        vc->rx_iov = NULL;
2235                                        recycle_iov_buf(card, iovb);
2236                                        return;
2237                                } else if (card->hbpool.count < card->hbnr.min) {
2238                                        struct sk_buff *new_hb;
2239                                        if ((new_hb =
2240                                             dev_alloc_skb(NS_HBUFSIZE)) !=
2241                                            NULL) {
2242                                                skb_queue_tail(&card->hbpool.
2243                                                               queue, new_hb);
2244                                                card->hbpool.count++;
2245                                        }
2246                                }
2247                                NS_PRV_BUFTYPE(hb) = BUF_NONE;
2248                        } else if (--card->hbpool.count < card->hbnr.min) {
2249                                struct sk_buff *new_hb;
2250                                if ((new_hb =
2251                                     dev_alloc_skb(NS_HBUFSIZE)) != NULL) {
2252                                        NS_PRV_BUFTYPE(new_hb) = BUF_NONE;
2253                                        skb_queue_tail(&card->hbpool.queue,
2254                                                       new_hb);
2255                                        card->hbpool.count++;
2256                                }
2257                                if (card->hbpool.count < card->hbnr.min) {
2258                                        if ((new_hb =
2259                                             dev_alloc_skb(NS_HBUFSIZE)) !=
2260                                            NULL) {
2261                                                NS_PRV_BUFTYPE(new_hb) =
2262                                                    BUF_NONE;
2263                                                skb_queue_tail(&card->hbpool.
2264                                                               queue, new_hb);
2265                                                card->hbpool.count++;
2266                                        }
2267                                }
2268                        }
2269
2270                        iov = (struct iovec *)iovb->data;
2271
2272                        if (!atm_charge(vcc, hb->truesize)) {
2273                                recycle_iovec_rx_bufs(card, iov,
2274                                                      NS_PRV_IOVCNT(iovb));
2275                                if (card->hbpool.count < card->hbnr.max) {
2276                                        skb_queue_tail(&card->hbpool.queue, hb);
2277                                        card->hbpool.count++;
2278                                } else
2279                                        dev_kfree_skb_any(hb);
2280                                atomic_inc(&vcc->stats->rx_drop);
2281                        } else {
2282                                /* Copy the small buffer to the huge buffer */
2283                                sb = (struct sk_buff *)iov->iov_base;
2284                                skb_copy_from_linear_data(sb, hb->data,
2285                                                          iov->iov_len);
2286                                skb_put(hb, iov->iov_len);
2287                                remaining = len - iov->iov_len;
2288                                iov++;
2289                                /* Free the small buffer */
2290                                push_rxbufs(card, sb);
2291
2292                                /* Copy all large buffers to the huge buffer and free them */
2293                                for (j = 1; j < NS_PRV_IOVCNT(iovb); j++) {
2294                                        lb = (struct sk_buff *)iov->iov_base;
2295                                        tocopy =
2296                                            min_t(int, remaining, iov->iov_len);
2297                                        skb_copy_from_linear_data(lb,
2298                                                                  skb_tail_pointer
2299                                                                  (hb), tocopy);
2300                                        skb_put(hb, tocopy);
2301                                        iov++;
2302                                        remaining -= tocopy;
2303                                        push_rxbufs(card, lb);
2304                                }
2305#ifdef EXTRA_DEBUG
2306                                if (remaining != 0 || hb->len != len)
2307                                        printk
2308                                            ("nicstar%d: Huge buffer len mismatch.\n",
2309                                             card->index);
2310#endif /* EXTRA_DEBUG */
2311                                ATM_SKB(hb)->vcc = vcc;
2312                                __net_timestamp(hb);
2313                                vcc->push(vcc, hb);
2314                                atomic_inc(&vcc->stats->rx);
2315                        }
2316                }
2317
2318                vc->rx_iov = NULL;
2319                recycle_iov_buf(card, iovb);
2320        }
2321
2322}
2323
2324static void recycle_rx_buf(ns_dev * card, struct sk_buff *skb)
2325{
2326        if (unlikely(NS_PRV_BUFTYPE(skb) == BUF_NONE)) {
2327                printk("nicstar%d: What kind of rx buffer is this?\n",
2328                       card->index);
2329                dev_kfree_skb_any(skb);
2330        } else
2331                push_rxbufs(card, skb);
2332}
2333
2334static void recycle_iovec_rx_bufs(ns_dev * card, struct iovec *iov, int count)
2335{
2336        while (count-- > 0)
2337                recycle_rx_buf(card, (struct sk_buff *)(iov++)->iov_base);
2338}
2339
2340static void recycle_iov_buf(ns_dev * card, struct sk_buff *iovb)
2341{
2342        if (card->iovpool.count < card->iovnr.max) {
2343                skb_queue_tail(&card->iovpool.queue, iovb);
2344                card->iovpool.count++;
2345        } else
2346                dev_kfree_skb_any(iovb);
2347}
2348
2349static void dequeue_sm_buf(ns_dev * card, struct sk_buff *sb)
2350{
2351        skb_unlink(sb, &card->sbpool.queue);
2352        if (card->sbfqc < card->sbnr.init) {
2353                struct sk_buff *new_sb;
2354                if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL) {
2355                        NS_PRV_BUFTYPE(new_sb) = BUF_SM;
2356                        skb_queue_tail(&card->sbpool.queue, new_sb);
2357                        skb_reserve(new_sb, NS_AAL0_HEADER);
2358                        push_rxbufs(card, new_sb);
2359                }
2360        }
2361        if (card->sbfqc < card->sbnr.init)
2362        {
2363                struct sk_buff *new_sb;
2364                if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL) {
2365                        NS_PRV_BUFTYPE(new_sb) = BUF_SM;
2366                        skb_queue_tail(&card->sbpool.queue, new_sb);
2367                        skb_reserve(new_sb, NS_AAL0_HEADER);
2368                        push_rxbufs(card, new_sb);
2369                }
2370        }
2371}
2372
2373static void dequeue_lg_buf(ns_dev * card, struct sk_buff *lb)
2374{
2375        skb_unlink(lb, &card->lbpool.queue);
2376        if (card->lbfqc < card->lbnr.init) {
2377                struct sk_buff *new_lb;
2378                if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL) {
2379                        NS_PRV_BUFTYPE(new_lb) = BUF_LG;
2380                        skb_queue_tail(&card->lbpool.queue, new_lb);
2381                        skb_reserve(new_lb, NS_SMBUFSIZE);
2382                        push_rxbufs(card, new_lb);
2383                }
2384        }
2385        if (card->lbfqc < card->lbnr.init)
2386        {
2387                struct sk_buff *new_lb;
2388                if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL) {
2389                        NS_PRV_BUFTYPE(new_lb) = BUF_LG;
2390                        skb_queue_tail(&card->lbpool.queue, new_lb);
2391                        skb_reserve(new_lb, NS_SMBUFSIZE);
2392                        push_rxbufs(card, new_lb);
2393                }
2394        }
2395}
2396
2397static int ns_proc_read(struct atm_dev *dev, loff_t * pos, char *page)
2398{
2399        u32 stat;
2400        ns_dev *card;
2401        int left;
2402
2403        left = (int)*pos;
2404        card = (ns_dev *) dev->dev_data;
2405        stat = readl(card->membase + STAT);
2406        if (!left--)
2407                return sprintf(page, "Pool   count    min   init    max \n");
2408        if (!left--)
2409                return sprintf(page, "Small  %5d  %5d  %5d  %5d \n",
2410                               ns_stat_sfbqc_get(stat), card->sbnr.min,
2411                               card->sbnr.init, card->sbnr.max);
2412        if (!left--)
2413                return sprintf(page, "Large  %5d  %5d  %5d  %5d \n",
2414                               ns_stat_lfbqc_get(stat), card->lbnr.min,
2415                               card->lbnr.init, card->lbnr.max);
2416        if (!left--)
2417                return sprintf(page, "Huge   %5d  %5d  %5d  %5d \n",
2418                               card->hbpool.count, card->hbnr.min,
2419                               card->hbnr.init, card->hbnr.max);
2420        if (!left--)
2421                return sprintf(page, "Iovec  %5d  %5d  %5d  %5d \n",
2422                               card->iovpool.count, card->iovnr.min,
2423                               card->iovnr.init, card->iovnr.max);
2424        if (!left--) {
2425                int retval;
2426                retval =
2427                    sprintf(page, "Interrupt counter: %u \n", card->intcnt);
2428                card->intcnt = 0;
2429                return retval;
2430        }
2431#if 0
2432        /* Dump 25.6 Mbps PHY registers */
2433        /* Now there's a 25.6 Mbps PHY driver this code isn't needed. I left it
2434           here just in case it's needed for debugging. */
2435        if (card->max_pcr == ATM_25_PCR && !left--) {
2436                u32 phy_regs[4];
2437                u32 i;
2438
2439                for (i = 0; i < 4; i++) {
2440                        while (CMD_BUSY(card)) ;
2441                        writel(NS_CMD_READ_UTILITY | 0x00000200 | i,
2442                               card->membase + CMD);
2443                        while (CMD_BUSY(card)) ;
2444                        phy_regs[i] = readl(card->membase + DR0) & 0x000000FF;
2445                }
2446
2447                return sprintf(page, "PHY regs: 0x%02X 0x%02X 0x%02X 0x%02X \n",
2448                               phy_regs[0], phy_regs[1], phy_regs[2],
2449                               phy_regs[3]);
2450        }
2451#endif /* 0 - Dump 25.6 Mbps PHY registers */
2452#if 0
2453        /* Dump TST */
2454        if (left-- < NS_TST_NUM_ENTRIES) {
2455                if (card->tste2vc[left + 1] == NULL)
2456                        return sprintf(page, "%5d - VBR/UBR \n", left + 1);
2457                else
2458                        return sprintf(page, "%5d - %d %d \n", left + 1,
2459                                       card->tste2vc[left + 1]->tx_vcc->vpi,
2460                                       card->tste2vc[left + 1]->tx_vcc->vci);
2461        }
2462#endif /* 0 */
2463        return 0;
2464}
2465
2466static int ns_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg)
2467{
2468        ns_dev *card;
2469        pool_levels pl;
2470        long btype;
2471        unsigned long flags;
2472
2473        card = dev->dev_data;
2474        switch (cmd) {
2475        case NS_GETPSTAT:
2476                if (get_user
2477                    (pl.buftype, &((pool_levels __user *) arg)->buftype))
2478                        return -EFAULT;
2479                switch (pl.buftype) {
2480                case NS_BUFTYPE_SMALL:
2481                        pl.count =
2482                            ns_stat_sfbqc_get(readl(card->membase + STAT));
2483                        pl.level.min = card->sbnr.min;
2484                        pl.level.init = card->sbnr.init;
2485                        pl.level.max = card->sbnr.max;
2486                        break;
2487
2488                case NS_BUFTYPE_LARGE:
2489                        pl.count =
2490                            ns_stat_lfbqc_get(readl(card->membase + STAT));
2491                        pl.level.min = card->lbnr.min;
2492                        pl.level.init = card->lbnr.init;
2493                        pl.level.max = card->lbnr.max;
2494                        break;
2495
2496                case NS_BUFTYPE_HUGE:
2497                        pl.count = card->hbpool.count;
2498                        pl.level.min = card->hbnr.min;
2499                        pl.level.init = card->hbnr.init;
2500                        pl.level.max = card->hbnr.max;
2501                        break;
2502
2503                case NS_BUFTYPE_IOVEC:
2504                        pl.count = card->iovpool.count;
2505                        pl.level.min = card->iovnr.min;
2506                        pl.level.init = card->iovnr.init;
2507                        pl.level.max = card->iovnr.max;
2508                        break;
2509
2510                default:
2511                        return -ENOIOCTLCMD;
2512
2513                }
2514                if (!copy_to_user((pool_levels __user *) arg, &pl, sizeof(pl)))
2515                        return (sizeof(pl));
2516                else
2517                        return -EFAULT;
2518
2519        case NS_SETBUFLEV:
2520                if (!capable(CAP_NET_ADMIN))
2521                        return -EPERM;
2522                if (copy_from_user(&pl, (pool_levels __user *) arg, sizeof(pl)))
2523                        return -EFAULT;
2524                if (pl.level.min >= pl.level.init
2525                    || pl.level.init >= pl.level.max)
2526                        return -EINVAL;
2527                if (pl.level.min == 0)
2528                        return -EINVAL;
2529                switch (pl.buftype) {
2530                case NS_BUFTYPE_SMALL:
2531                        if (pl.level.max > TOP_SB)
2532                                return -EINVAL;
2533                        card->sbnr.min = pl.level.min;
2534                        card->sbnr.init = pl.level.init;
2535                        card->sbnr.max = pl.level.max;
2536                        break;
2537
2538                case NS_BUFTYPE_LARGE:
2539                        if (pl.level.max > TOP_LB)
2540                                return -EINVAL;
2541                        card->lbnr.min = pl.level.min;
2542                        card->lbnr.init = pl.level.init;
2543                        card->lbnr.max = pl.level.max;
2544                        break;
2545
2546                case NS_BUFTYPE_HUGE:
2547                        if (pl.level.max > TOP_HB)
2548                                return -EINVAL;
2549                        card->hbnr.min = pl.level.min;
2550                        card->hbnr.init = pl.level.init;
2551                        card->hbnr.max = pl.level.max;
2552                        break;
2553
2554                case NS_BUFTYPE_IOVEC:
2555                        if (pl.level.max > TOP_IOVB)
2556                                return -EINVAL;
2557                        card->iovnr.min = pl.level.min;
2558                        card->iovnr.init = pl.level.init;
2559                        card->iovnr.max = pl.level.max;
2560                        break;
2561
2562                default:
2563                        return -EINVAL;
2564
2565                }
2566                return 0;
2567
2568        case NS_ADJBUFLEV:
2569                if (!capable(CAP_NET_ADMIN))
2570                        return -EPERM;
2571                btype = (long)arg;      /* a long is the same size as a pointer or bigger */
2572                switch (btype) {
2573                case NS_BUFTYPE_SMALL:
2574                        while (card->sbfqc < card->sbnr.init) {
2575                                struct sk_buff *sb;
2576
2577                                sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
2578                                if (sb == NULL)
2579                                        return -ENOMEM;
2580                                NS_PRV_BUFTYPE(sb) = BUF_SM;
2581                                skb_queue_tail(&card->sbpool.queue, sb);
2582                                skb_reserve(sb, NS_AAL0_HEADER);
2583                                push_rxbufs(card, sb);
2584                        }
2585                        break;
2586
2587                case NS_BUFTYPE_LARGE:
2588                        while (card->lbfqc < card->lbnr.init) {
2589                                struct sk_buff *lb;
2590
2591                                lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
2592                                if (lb == NULL)
2593                                        return -ENOMEM;
2594                                NS_PRV_BUFTYPE(lb) = BUF_LG;
2595                                skb_queue_tail(&card->lbpool.queue, lb);
2596                                skb_reserve(lb, NS_SMBUFSIZE);
2597                                push_rxbufs(card, lb);
2598                        }
2599                        break;
2600
2601                case NS_BUFTYPE_HUGE:
2602                        while (card->hbpool.count > card->hbnr.init) {
2603                                struct sk_buff *hb;
2604
2605                                spin_lock_irqsave(&card->int_lock, flags);
2606                                hb = skb_dequeue(&card->hbpool.queue);
2607                                card->hbpool.count--;
2608                                spin_unlock_irqrestore(&card->int_lock, flags);
2609                                if (hb == NULL)
2610                                        printk
2611                                            ("nicstar%d: huge buffer count inconsistent.\n",
2612                                             card->index);
2613                                else
2614                                        dev_kfree_skb_any(hb);
2615
2616                        }
2617                        while (card->hbpool.count < card->hbnr.init) {
2618                                struct sk_buff *hb;
2619
2620                                hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
2621                                if (hb == NULL)
2622                                        return -ENOMEM;
2623                                NS_PRV_BUFTYPE(hb) = BUF_NONE;
2624                                spin_lock_irqsave(&card->int_lock, flags);
2625                                skb_queue_tail(&card->hbpool.queue, hb);
2626                                card->hbpool.count++;
2627                                spin_unlock_irqrestore(&card->int_lock, flags);
2628                        }
2629                        break;
2630
2631                case NS_BUFTYPE_IOVEC:
2632                        while (card->iovpool.count > card->iovnr.init) {
2633                                struct sk_buff *iovb;
2634
2635                                spin_lock_irqsave(&card->int_lock, flags);
2636                                iovb = skb_dequeue(&card->iovpool.queue);
2637                                card->iovpool.count--;
2638                                spin_unlock_irqrestore(&card->int_lock, flags);
2639                                if (iovb == NULL)
2640                                        printk
2641                                            ("nicstar%d: iovec buffer count inconsistent.\n",
2642                                             card->index);
2643                                else
2644                                        dev_kfree_skb_any(iovb);
2645
2646                        }
2647                        while (card->iovpool.count < card->iovnr.init) {
2648                                struct sk_buff *iovb;
2649
2650                                iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
2651                                if (iovb == NULL)
2652                                        return -ENOMEM;
2653                                NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2654                                spin_lock_irqsave(&card->int_lock, flags);
2655                                skb_queue_tail(&card->iovpool.queue, iovb);
2656                                card->iovpool.count++;
2657                                spin_unlock_irqrestore(&card->int_lock, flags);
2658                        }
2659                        break;
2660
2661                default:
2662                        return -EINVAL;
2663
2664                }
2665                return 0;
2666
2667        default:
2668                if (dev->phy && dev->phy->ioctl) {
2669                        return dev->phy->ioctl(dev, cmd, arg);
2670                } else {
2671                        printk("nicstar%d: %s == NULL \n", card->index,
2672                               dev->phy ? "dev->phy->ioctl" : "dev->phy");
2673                        return -ENOIOCTLCMD;
2674                }
2675        }
2676}
2677
2678#ifdef EXTRA_DEBUG
2679static void which_list(ns_dev * card, struct sk_buff *skb)
2680{
2681        printk("skb buf_type: 0x%08x\n", NS_PRV_BUFTYPE(skb));
2682}
2683#endif /* EXTRA_DEBUG */
2684
2685static void ns_poll(unsigned long arg)
2686{
2687        int i;
2688        ns_dev *card;
2689        unsigned long flags;
2690        u32 stat_r, stat_w;
2691
2692        PRINTK("nicstar: Entering ns_poll().\n");
2693        for (i = 0; i < num_cards; i++) {
2694                card = cards[i];
2695                if (spin_is_locked(&card->int_lock)) {
2696                        /* Probably it isn't worth spinning */
2697                        continue;
2698                }
2699                spin_lock_irqsave(&card->int_lock, flags);
2700
2701                stat_w = 0;
2702                stat_r = readl(card->membase + STAT);
2703                if (stat_r & NS_STAT_TSIF)
2704                        stat_w |= NS_STAT_TSIF;
2705                if (stat_r & NS_STAT_EOPDU)
2706                        stat_w |= NS_STAT_EOPDU;
2707
2708                process_tsq(card);
2709                process_rsq(card);
2710
2711                writel(stat_w, card->membase + STAT);
2712                spin_unlock_irqrestore(&card->int_lock, flags);
2713        }
2714        mod_timer(&ns_timer, jiffies + NS_POLL_PERIOD);
2715        PRINTK("nicstar: Leaving ns_poll().\n");
2716}
2717
2718static void ns_phy_put(struct atm_dev *dev, unsigned char value,
2719                       unsigned long addr)
2720{
2721        ns_dev *card;
2722        unsigned long flags;
2723
2724        card = dev->dev_data;
2725        spin_lock_irqsave(&card->res_lock, flags);
2726        while (CMD_BUSY(card)) ;
2727        writel((u32) value, card->membase + DR0);
2728        writel(NS_CMD_WRITE_UTILITY | 0x00000200 | (addr & 0x000000FF),
2729               card->membase + CMD);
2730        spin_unlock_irqrestore(&card->res_lock, flags);
2731}
2732
2733static unsigned char ns_phy_get(struct atm_dev *dev, unsigned long addr)
2734{
2735        ns_dev *card;
2736        unsigned long flags;
2737        u32 data;
2738
2739        card = dev->dev_data;
2740        spin_lock_irqsave(&card->res_lock, flags);
2741        while (CMD_BUSY(card)) ;
2742        writel(NS_CMD_READ_UTILITY | 0x00000200 | (addr & 0x000000FF),
2743               card->membase + CMD);
2744        while (CMD_BUSY(card)) ;
2745        data = readl(card->membase + DR0) & 0x000000FF;
2746        spin_unlock_irqrestore(&card->res_lock, flags);
2747        return (unsigned char)data;
2748}
2749
2750module_init(nicstar_init);
2751module_exit(nicstar_cleanup);
2752