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 "nicstar.h"
  56#ifdef CONFIG_ATM_NICSTAR_USE_SUNI
  57#include "suni.h"
  58#endif /* CONFIG_ATM_NICSTAR_USE_SUNI */
  59#ifdef CONFIG_ATM_NICSTAR_USE_IDT77105
  60#include "idt77105.h"
  61#endif /* CONFIG_ATM_NICSTAR_USE_IDT77105 */
  62
  63/* Additional code */
  64
  65#include "nicstarmac.c"
  66
  67/* Configurable parameters */
  68
  69#undef PHY_LOOPBACK
  70#undef TX_DEBUG
  71#undef RX_DEBUG
  72#undef GENERAL_DEBUG
  73#undef EXTRA_DEBUG
  74
  75#undef NS_USE_DESTRUCTORS       /* For now keep this undefined unless you know
  76                                   you're going to use only raw ATM */
  77
  78/* Do not touch these */
  79
  80#ifdef TX_DEBUG
  81#define TXPRINTK(args...) printk(args)
  82#else
  83#define TXPRINTK(args...)
  84#endif /* TX_DEBUG */
  85
  86#ifdef RX_DEBUG
  87#define RXPRINTK(args...) printk(args)
  88#else
  89#define RXPRINTK(args...)
  90#endif /* RX_DEBUG */
  91
  92#ifdef GENERAL_DEBUG
  93#define PRINTK(args...) printk(args)
  94#else
  95#define PRINTK(args...)
  96#endif /* GENERAL_DEBUG */
  97
  98#ifdef EXTRA_DEBUG
  99#define XPRINTK(args...) printk(args)
 100#else
 101#define XPRINTK(args...)
 102#endif /* EXTRA_DEBUG */
 103
 104/* Macros */
 105
 106#define CMD_BUSY(card) (readl((card)->membase + STAT) & NS_STAT_CMDBZ)
 107
 108#define NS_DELAY mdelay(1)
 109
 110#define PTR_DIFF(a, b)  ((u32)((unsigned long)(a) - (unsigned long)(b)))
 111
 112#ifndef ATM_SKB
 113#define ATM_SKB(s) (&(s)->atm)
 114#endif
 115
 116#define scq_virt_to_bus(scq, p) \
 117                (scq->dma + ((unsigned long)(p) - (unsigned long)(scq)->org))
 118
 119/* Function declarations */
 120
 121static u32 ns_read_sram(ns_dev * card, u32 sram_address);
 122static void ns_write_sram(ns_dev * card, u32 sram_address, u32 * value,
 123                          int count);
 124static int ns_init_card(int i, struct pci_dev *pcidev);
 125static void ns_init_card_error(ns_dev * card, int error);
 126static scq_info *get_scq(ns_dev *card, int size, u32 scd);
 127static void free_scq(ns_dev *card, scq_info * scq, struct atm_vcc *vcc);
 128static void push_rxbufs(ns_dev *, struct sk_buff *);
 129static irqreturn_t ns_irq_handler(int irq, void *dev_id);
 130static int ns_open(struct atm_vcc *vcc);
 131static void ns_close(struct atm_vcc *vcc);
 132static void fill_tst(ns_dev * card, int n, vc_map * vc);
 133static int ns_send(struct atm_vcc *vcc, struct sk_buff *skb);
 134static int push_scqe(ns_dev * card, vc_map * vc, scq_info * scq, ns_scqe * tbd,
 135                     struct sk_buff *skb);
 136static void process_tsq(ns_dev * card);
 137static void drain_scq(ns_dev * card, scq_info * scq, int pos);
 138static void process_rsq(ns_dev * card);
 139static void dequeue_rx(ns_dev * card, ns_rsqe * rsqe);
 140#ifdef NS_USE_DESTRUCTORS
 141static void ns_sb_destructor(struct sk_buff *sb);
 142static void ns_lb_destructor(struct sk_buff *lb);
 143static void ns_hb_destructor(struct sk_buff *hb);
 144#endif /* NS_USE_DESTRUCTORS */
 145static void recycle_rx_buf(ns_dev * card, struct sk_buff *skb);
 146static void recycle_iovec_rx_bufs(ns_dev * card, struct iovec *iov, int count);
 147static void recycle_iov_buf(ns_dev * card, struct sk_buff *iovb);
 148static void dequeue_sm_buf(ns_dev * card, struct sk_buff *sb);
 149static void dequeue_lg_buf(ns_dev * card, struct sk_buff *lb);
 150static int ns_proc_read(struct atm_dev *dev, loff_t * pos, char *page);
 151static int ns_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg);
 152#ifdef EXTRA_DEBUG
 153static void which_list(ns_dev * card, struct sk_buff *skb);
 154#endif
 155static void ns_poll(unsigned long arg);
 156static int ns_parse_mac(char *mac, unsigned char *esi);
 157static void ns_phy_put(struct atm_dev *dev, unsigned char value,
 158                       unsigned long addr);
 159static unsigned char ns_phy_get(struct atm_dev *dev, unsigned long addr);
 160
 161/* Global variables */
 162
 163static struct ns_dev *cards[NS_MAX_CARDS];
 164static unsigned num_cards;
 165static struct atmdev_ops atm_ops = {
 166        .open = ns_open,
 167        .close = ns_close,
 168        .ioctl = ns_ioctl,
 169        .send = ns_send,
 170        .phy_put = ns_phy_put,
 171        .phy_get = ns_phy_get,
 172        .proc_read = ns_proc_read,
 173        .owner = THIS_MODULE,
 174};
 175
 176static struct timer_list ns_timer;
 177static char *mac[NS_MAX_CARDS];
 178module_param_array(mac, charp, NULL, 0);
 179MODULE_LICENSE("GPL");
 180
 181/* Functions */
 182
 183static int nicstar_init_one(struct pci_dev *pcidev,
 184                            const struct pci_device_id *ent)
 185{
 186        static int index = -1;
 187        unsigned int error;
 188
 189        index++;
 190        cards[index] = NULL;
 191
 192        error = ns_init_card(index, pcidev);
 193        if (error) {
 194                cards[index--] = NULL;  /* don't increment index */
 195                goto err_out;
 196        }
 197
 198        return 0;
 199err_out:
 200        return -ENODEV;
 201}
 202
 203static void nicstar_remove_one(struct pci_dev *pcidev)
 204{
 205        int i, j;
 206        ns_dev *card = pci_get_drvdata(pcidev);
 207        struct sk_buff *hb;
 208        struct sk_buff *iovb;
 209        struct sk_buff *lb;
 210        struct sk_buff *sb;
 211
 212        i = card->index;
 213
 214        if (cards[i] == NULL)
 215                return;
 216
 217        if (card->atmdev->phy && card->atmdev->phy->stop)
 218                card->atmdev->phy->stop(card->atmdev);
 219
 220        /* Stop everything */
 221        writel(0x00000000, card->membase + CFG);
 222
 223        /* De-register device */
 224        atm_dev_deregister(card->atmdev);
 225
 226        /* Disable PCI device */
 227        pci_disable_device(pcidev);
 228
 229        /* Free up resources */
 230        j = 0;
 231        PRINTK("nicstar%d: freeing %d huge buffers.\n", i, card->hbpool.count);
 232        while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL) {
 233                dev_kfree_skb_any(hb);
 234                j++;
 235        }
 236        PRINTK("nicstar%d: %d huge buffers freed.\n", i, j);
 237        j = 0;
 238        PRINTK("nicstar%d: freeing %d iovec buffers.\n", i,
 239               card->iovpool.count);
 240        while ((iovb = skb_dequeue(&card->iovpool.queue)) != NULL) {
 241                dev_kfree_skb_any(iovb);
 242                j++;
 243        }
 244        PRINTK("nicstar%d: %d iovec buffers freed.\n", i, j);
 245        while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
 246                dev_kfree_skb_any(lb);
 247        while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
 248                dev_kfree_skb_any(sb);
 249        free_scq(card, card->scq0, NULL);
 250        for (j = 0; j < NS_FRSCD_NUM; j++) {
 251                if (card->scd2vc[j] != NULL)
 252                        free_scq(card, card->scd2vc[j]->scq, card->scd2vc[j]->tx_vcc);
 253        }
 254        idr_remove_all(&card->idr);
 255        idr_destroy(&card->idr);
 256        pci_free_consistent(card->pcidev, NS_RSQSIZE + NS_RSQ_ALIGNMENT,
 257                            card->rsq.org, card->rsq.dma);
 258        pci_free_consistent(card->pcidev, NS_TSQSIZE + NS_TSQ_ALIGNMENT,
 259                            card->tsq.org, card->tsq.dma);
 260        free_irq(card->pcidev->irq, card);
 261        iounmap(card->membase);
 262        kfree(card);
 263}
 264
 265static struct pci_device_id nicstar_pci_tbl[] = {
 266        { PCI_VDEVICE(IDT, PCI_DEVICE_ID_IDT_IDT77201), 0 },
 267        {0,}                    /* terminate list */
 268};
 269
 270MODULE_DEVICE_TABLE(pci, nicstar_pci_tbl);
 271
 272static struct pci_driver nicstar_driver = {
 273        .name = "nicstar",
 274        .id_table = nicstar_pci_tbl,
 275        .probe = nicstar_init_one,
 276        .remove = nicstar_remove_one,
 277};
 278
 279static int __init nicstar_init(void)
 280{
 281        unsigned error = 0;     /* Initialized to remove compile warning */
 282
 283        XPRINTK("nicstar: nicstar_init() called.\n");
 284
 285        error = pci_register_driver(&nicstar_driver);
 286
 287        TXPRINTK("nicstar: TX debug enabled.\n");
 288        RXPRINTK("nicstar: RX debug enabled.\n");
 289        PRINTK("nicstar: General debug enabled.\n");
 290#ifdef PHY_LOOPBACK
 291        printk("nicstar: using PHY loopback.\n");
 292#endif /* PHY_LOOPBACK */
 293        XPRINTK("nicstar: nicstar_init() returned.\n");
 294
 295        if (!error) {
 296                init_timer(&ns_timer);
 297                ns_timer.expires = jiffies + NS_POLL_PERIOD;
 298                ns_timer.data = 0UL;
 299                ns_timer.function = ns_poll;
 300                add_timer(&ns_timer);
 301        }
 302
 303        return error;
 304}
 305
 306static void __exit nicstar_cleanup(void)
 307{
 308        XPRINTK("nicstar: nicstar_cleanup() called.\n");
 309
 310        del_timer(&ns_timer);
 311
 312        pci_unregister_driver(&nicstar_driver);
 313
 314        XPRINTK("nicstar: nicstar_cleanup() returned.\n");
 315}
 316
 317static u32 ns_read_sram(ns_dev * card, u32 sram_address)
 318{
 319        unsigned long flags;
 320        u32 data;
 321        sram_address <<= 2;
 322        sram_address &= 0x0007FFFC;     /* address must be dword aligned */
 323        sram_address |= 0x50000000;     /* SRAM read command */
 324        spin_lock_irqsave(&card->res_lock, flags);
 325        while (CMD_BUSY(card)) ;
 326        writel(sram_address, card->membase + CMD);
 327        while (CMD_BUSY(card)) ;
 328        data = readl(card->membase + DR0);
 329        spin_unlock_irqrestore(&card->res_lock, flags);
 330        return data;
 331}
 332
 333static void ns_write_sram(ns_dev * card, u32 sram_address, u32 * value,
 334                          int count)
 335{
 336        unsigned long flags;
 337        int i, c;
 338        count--;                /* count range now is 0..3 instead of 1..4 */
 339        c = count;
 340        c <<= 2;                /* to use increments of 4 */
 341        spin_lock_irqsave(&card->res_lock, flags);
 342        while (CMD_BUSY(card)) ;
 343        for (i = 0; i <= c; i += 4)
 344                writel(*(value++), card->membase + i);
 345        /* Note: DR# registers are the first 4 dwords in nicstar's memspace,
 346           so card->membase + DR0 == card->membase */
 347        sram_address <<= 2;
 348        sram_address &= 0x0007FFFC;
 349        sram_address |= (0x40000000 | count);
 350        writel(sram_address, card->membase + CMD);
 351        spin_unlock_irqrestore(&card->res_lock, flags);
 352}
 353
 354static int ns_init_card(int i, struct pci_dev *pcidev)
 355{
 356        int j;
 357        struct ns_dev *card = NULL;
 358        unsigned char pci_latency;
 359        unsigned error;
 360        u32 data;
 361        u32 u32d[4];
 362        u32 ns_cfg_rctsize;
 363        int bcount;
 364        unsigned long membase;
 365
 366        error = 0;
 367
 368        if (pci_enable_device(pcidev)) {
 369                printk("nicstar%d: can't enable PCI device\n", i);
 370                error = 2;
 371                ns_init_card_error(card, error);
 372                return error;
 373        }
 374        if ((pci_set_dma_mask(pcidev, DMA_BIT_MASK(32)) != 0) ||
 375            (pci_set_consistent_dma_mask(pcidev, DMA_BIT_MASK(32)) != 0)) {
 376                printk(KERN_WARNING
 377                       "nicstar%d: No suitable DMA available.\n", i);
 378                error = 2;
 379                ns_init_card_error(card, error);
 380                return error;
 381        }
 382
 383        if ((card = kmalloc(sizeof(ns_dev), GFP_KERNEL)) == NULL) {
 384                printk
 385                    ("nicstar%d: can't allocate memory for device structure.\n",
 386                     i);
 387                error = 2;
 388                ns_init_card_error(card, error);
 389                return error;
 390        }
 391        cards[i] = card;
 392        spin_lock_init(&card->int_lock);
 393        spin_lock_init(&card->res_lock);
 394
 395        pci_set_drvdata(pcidev, card);
 396
 397        card->index = i;
 398        card->atmdev = NULL;
 399        card->pcidev = pcidev;
 400        membase = pci_resource_start(pcidev, 1);
 401        card->membase = ioremap(membase, NS_IOREMAP_SIZE);
 402        if (!card->membase) {
 403                printk("nicstar%d: can't ioremap() membase.\n", i);
 404                error = 3;
 405                ns_init_card_error(card, error);
 406                return error;
 407        }
 408        PRINTK("nicstar%d: membase at 0x%p.\n", i, card->membase);
 409
 410        pci_set_master(pcidev);
 411
 412        if (pci_read_config_byte(pcidev, PCI_LATENCY_TIMER, &pci_latency) != 0) {
 413                printk("nicstar%d: can't read PCI latency timer.\n", i);
 414                error = 6;
 415                ns_init_card_error(card, error);
 416                return error;
 417        }
 418#ifdef NS_PCI_LATENCY
 419        if (pci_latency < NS_PCI_LATENCY) {
 420                PRINTK("nicstar%d: setting PCI latency timer to %d.\n", i,
 421                       NS_PCI_LATENCY);
 422                for (j = 1; j < 4; j++) {
 423                        if (pci_write_config_byte
 424                            (pcidev, PCI_LATENCY_TIMER, NS_PCI_LATENCY) != 0)
 425                                break;
 426                }
 427                if (j == 4) {
 428                        printk
 429                            ("nicstar%d: can't set PCI latency timer to %d.\n",
 430                             i, NS_PCI_LATENCY);
 431                        error = 7;
 432                        ns_init_card_error(card, error);
 433                        return error;
 434                }
 435        }
 436#endif /* NS_PCI_LATENCY */
 437
 438        /* Clear timer overflow */
 439        data = readl(card->membase + STAT);
 440        if (data & NS_STAT_TMROF)
 441                writel(NS_STAT_TMROF, card->membase + STAT);
 442
 443        /* Software reset */
 444        writel(NS_CFG_SWRST, card->membase + CFG);
 445        NS_DELAY;
 446        writel(0x00000000, card->membase + CFG);
 447
 448        /* PHY reset */
 449        writel(0x00000008, card->membase + GP);
 450        NS_DELAY;
 451        writel(0x00000001, card->membase + GP);
 452        NS_DELAY;
 453        while (CMD_BUSY(card)) ;
 454        writel(NS_CMD_WRITE_UTILITY | 0x00000100, card->membase + CMD); /* Sync UTOPIA with SAR clock */
 455        NS_DELAY;
 456
 457        /* Detect PHY type */
 458        while (CMD_BUSY(card)) ;
 459        writel(NS_CMD_READ_UTILITY | 0x00000200, card->membase + CMD);
 460        while (CMD_BUSY(card)) ;
 461        data = readl(card->membase + DR0);
 462        switch (data) {
 463        case 0x00000009:
 464                printk("nicstar%d: PHY seems to be 25 Mbps.\n", i);
 465                card->max_pcr = ATM_25_PCR;
 466                while (CMD_BUSY(card)) ;
 467                writel(0x00000008, card->membase + DR0);
 468                writel(NS_CMD_WRITE_UTILITY | 0x00000200, card->membase + CMD);
 469                /* Clear an eventual pending interrupt */
 470                writel(NS_STAT_SFBQF, card->membase + STAT);
 471#ifdef PHY_LOOPBACK
 472                while (CMD_BUSY(card)) ;
 473                writel(0x00000022, card->membase + DR0);
 474                writel(NS_CMD_WRITE_UTILITY | 0x00000202, card->membase + CMD);
 475#endif /* PHY_LOOPBACK */
 476                break;
 477        case 0x00000030:
 478        case 0x00000031:
 479                printk("nicstar%d: PHY seems to be 155 Mbps.\n", i);
 480                card->max_pcr = ATM_OC3_PCR;
 481#ifdef PHY_LOOPBACK
 482                while (CMD_BUSY(card)) ;
 483                writel(0x00000002, card->membase + DR0);
 484                writel(NS_CMD_WRITE_UTILITY | 0x00000205, card->membase + CMD);
 485#endif /* PHY_LOOPBACK */
 486                break;
 487        default:
 488                printk("nicstar%d: unknown PHY type (0x%08X).\n", i, data);
 489                error = 8;
 490                ns_init_card_error(card, error);
 491                return error;
 492        }
 493        writel(0x00000000, card->membase + GP);
 494
 495        /* Determine SRAM size */
 496        data = 0x76543210;
 497        ns_write_sram(card, 0x1C003, &data, 1);
 498        data = 0x89ABCDEF;
 499        ns_write_sram(card, 0x14003, &data, 1);
 500        if (ns_read_sram(card, 0x14003) == 0x89ABCDEF &&
 501            ns_read_sram(card, 0x1C003) == 0x76543210)
 502                card->sram_size = 128;
 503        else
 504                card->sram_size = 32;
 505        PRINTK("nicstar%d: %dK x 32bit SRAM size.\n", i, card->sram_size);
 506
 507        card->rct_size = NS_MAX_RCTSIZE;
 508
 509#if (NS_MAX_RCTSIZE == 4096)
 510        if (card->sram_size == 128)
 511                printk
 512                    ("nicstar%d: limiting maximum VCI. See NS_MAX_RCTSIZE in nicstar.h\n",
 513                     i);
 514#elif (NS_MAX_RCTSIZE == 16384)
 515        if (card->sram_size == 32) {
 516                printk
 517                    ("nicstar%d: wasting memory. See NS_MAX_RCTSIZE in nicstar.h\n",
 518                     i);
 519                card->rct_size = 4096;
 520        }
 521#else
 522#error NS_MAX_RCTSIZE must be either 4096 or 16384 in nicstar.c
 523#endif
 524
 525        card->vpibits = NS_VPIBITS;
 526        if (card->rct_size == 4096)
 527                card->vcibits = 12 - NS_VPIBITS;
 528        else                    /* card->rct_size == 16384 */
 529                card->vcibits = 14 - NS_VPIBITS;
 530
 531        /* Initialize the nicstar eeprom/eprom stuff, for the MAC addr */
 532        if (mac[i] == NULL)
 533                nicstar_init_eprom(card->membase);
 534
 535        /* Set the VPI/VCI MSb mask to zero so we can receive OAM cells */
 536        writel(0x00000000, card->membase + VPM);
 537
 538        /* Initialize TSQ */
 539        card->tsq.org = pci_alloc_consistent(card->pcidev,
 540                                             NS_TSQSIZE + NS_TSQ_ALIGNMENT,
 541                                             &card->tsq.dma);
 542        if (card->tsq.org == NULL) {
 543                printk("nicstar%d: can't allocate TSQ.\n", i);
 544                error = 10;
 545                ns_init_card_error(card, error);
 546                return error;
 547        }
 548        card->tsq.base = PTR_ALIGN(card->tsq.org, NS_TSQ_ALIGNMENT);
 549        card->tsq.next = card->tsq.base;
 550        card->tsq.last = card->tsq.base + (NS_TSQ_NUM_ENTRIES - 1);
 551        for (j = 0; j < NS_TSQ_NUM_ENTRIES; j++)
 552                ns_tsi_init(card->tsq.base + j);
 553        writel(0x00000000, card->membase + TSQH);
 554        writel(ALIGN(card->tsq.dma, NS_TSQ_ALIGNMENT), card->membase + TSQB);
 555        PRINTK("nicstar%d: TSQ base at 0x%p.\n", i, card->tsq.base);
 556
 557        /* Initialize RSQ */
 558        card->rsq.org = pci_alloc_consistent(card->pcidev,
 559                                             NS_RSQSIZE + NS_RSQ_ALIGNMENT,
 560                                             &card->rsq.dma);
 561        if (card->rsq.org == NULL) {
 562                printk("nicstar%d: can't allocate RSQ.\n", i);
 563                error = 11;
 564                ns_init_card_error(card, error);
 565                return error;
 566        }
 567        card->rsq.base = PTR_ALIGN(card->rsq.org, NS_RSQ_ALIGNMENT);
 568        card->rsq.next = card->rsq.base;
 569        card->rsq.last = card->rsq.base + (NS_RSQ_NUM_ENTRIES - 1);
 570        for (j = 0; j < NS_RSQ_NUM_ENTRIES; j++)
 571                ns_rsqe_init(card->rsq.base + j);
 572        writel(0x00000000, card->membase + RSQH);
 573        writel(ALIGN(card->rsq.dma, NS_RSQ_ALIGNMENT), card->membase + RSQB);
 574        PRINTK("nicstar%d: RSQ base at 0x%p.\n", i, card->rsq.base);
 575
 576        /* Initialize SCQ0, the only VBR SCQ used */
 577        card->scq1 = NULL;
 578        card->scq2 = NULL;
 579        card->scq0 = get_scq(card, VBR_SCQSIZE, NS_VRSCD0);
 580        if (card->scq0 == NULL) {
 581                printk("nicstar%d: can't get SCQ0.\n", i);
 582                error = 12;
 583                ns_init_card_error(card, error);
 584                return error;
 585        }
 586        u32d[0] = scq_virt_to_bus(card->scq0, card->scq0->base);
 587        u32d[1] = (u32) 0x00000000;
 588        u32d[2] = (u32) 0xffffffff;
 589        u32d[3] = (u32) 0x00000000;
 590        ns_write_sram(card, NS_VRSCD0, u32d, 4);
 591        ns_write_sram(card, NS_VRSCD1, u32d, 4);        /* These last two won't be used */
 592        ns_write_sram(card, NS_VRSCD2, u32d, 4);        /* but are initialized, just in case... */
 593        card->scq0->scd = NS_VRSCD0;
 594        PRINTK("nicstar%d: VBR-SCQ0 base at 0x%p.\n", i, card->scq0->base);
 595
 596        /* Initialize TSTs */
 597        card->tst_addr = NS_TST0;
 598        card->tst_free_entries = NS_TST_NUM_ENTRIES;
 599        data = NS_TST_OPCODE_VARIABLE;
 600        for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
 601                ns_write_sram(card, NS_TST0 + j, &data, 1);
 602        data = ns_tste_make(NS_TST_OPCODE_END, NS_TST0);
 603        ns_write_sram(card, NS_TST0 + NS_TST_NUM_ENTRIES, &data, 1);
 604        for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
 605                ns_write_sram(card, NS_TST1 + j, &data, 1);
 606        data = ns_tste_make(NS_TST_OPCODE_END, NS_TST1);
 607        ns_write_sram(card, NS_TST1 + NS_TST_NUM_ENTRIES, &data, 1);
 608        for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
 609                card->tste2vc[j] = NULL;
 610        writel(NS_TST0 << 2, card->membase + TSTB);
 611
 612        /* Initialize RCT. AAL type is set on opening the VC. */
 613#ifdef RCQ_SUPPORT
 614        u32d[0] = NS_RCTE_RAWCELLINTEN;
 615#else
 616        u32d[0] = 0x00000000;
 617#endif /* RCQ_SUPPORT */
 618        u32d[1] = 0x00000000;
 619        u32d[2] = 0x00000000;
 620        u32d[3] = 0xFFFFFFFF;
 621        for (j = 0; j < card->rct_size; j++)
 622                ns_write_sram(card, j * 4, u32d, 4);
 623
 624        memset(card->vcmap, 0, NS_MAX_RCTSIZE * sizeof(vc_map));
 625
 626        for (j = 0; j < NS_FRSCD_NUM; j++)
 627                card->scd2vc[j] = NULL;
 628
 629        /* Initialize buffer levels */
 630        card->sbnr.min = MIN_SB;
 631        card->sbnr.init = NUM_SB;
 632        card->sbnr.max = MAX_SB;
 633        card->lbnr.min = MIN_LB;
 634        card->lbnr.init = NUM_LB;
 635        card->lbnr.max = MAX_LB;
 636        card->iovnr.min = MIN_IOVB;
 637        card->iovnr.init = NUM_IOVB;
 638        card->iovnr.max = MAX_IOVB;
 639        card->hbnr.min = MIN_HB;
 640        card->hbnr.init = NUM_HB;
 641        card->hbnr.max = MAX_HB;
 642
 643        card->sm_handle = 0x00000000;
 644        card->sm_addr = 0x00000000;
 645        card->lg_handle = 0x00000000;
 646        card->lg_addr = 0x00000000;
 647
 648        card->efbie = 1;        /* To prevent push_rxbufs from enabling the interrupt */
 649
 650        idr_init(&card->idr);
 651
 652        /* Pre-allocate some huge buffers */
 653        skb_queue_head_init(&card->hbpool.queue);
 654        card->hbpool.count = 0;
 655        for (j = 0; j < NUM_HB; j++) {
 656                struct sk_buff *hb;
 657                hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
 658                if (hb == NULL) {
 659                        printk
 660                            ("nicstar%d: can't allocate %dth of %d huge buffers.\n",
 661                             i, j, NUM_HB);
 662                        error = 13;
 663                        ns_init_card_error(card, error);
 664                        return error;
 665                }
 666                NS_PRV_BUFTYPE(hb) = BUF_NONE;
 667                skb_queue_tail(&card->hbpool.queue, hb);
 668                card->hbpool.count++;
 669        }
 670
 671        /* Allocate large buffers */
 672        skb_queue_head_init(&card->lbpool.queue);
 673        card->lbpool.count = 0; /* Not used */
 674        for (j = 0; j < NUM_LB; j++) {
 675                struct sk_buff *lb;
 676                lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
 677                if (lb == NULL) {
 678                        printk
 679                            ("nicstar%d: can't allocate %dth of %d large buffers.\n",
 680                             i, j, NUM_LB);
 681                        error = 14;
 682                        ns_init_card_error(card, error);
 683                        return error;
 684                }
 685                NS_PRV_BUFTYPE(lb) = BUF_LG;
 686                skb_queue_tail(&card->lbpool.queue, lb);
 687                skb_reserve(lb, NS_SMBUFSIZE);
 688                push_rxbufs(card, lb);
 689                /* Due to the implementation of push_rxbufs() this is 1, not 0 */
 690                if (j == 1) {
 691                        card->rcbuf = lb;
 692                        card->rawcell = (struct ns_rcqe *) lb->data;
 693                        card->rawch = NS_PRV_DMA(lb);
 694                }
 695        }
 696        /* Test for strange behaviour which leads to crashes */
 697        if ((bcount =
 698             ns_stat_lfbqc_get(readl(card->membase + STAT))) < card->lbnr.min) {
 699                printk
 700                    ("nicstar%d: Strange... Just allocated %d large buffers and lfbqc = %d.\n",
 701                     i, j, bcount);
 702                error = 14;
 703                ns_init_card_error(card, error);
 704                return error;
 705        }
 706
 707        /* Allocate small buffers */
 708        skb_queue_head_init(&card->sbpool.queue);
 709        card->sbpool.count = 0; /* Not used */
 710        for (j = 0; j < NUM_SB; j++) {
 711                struct sk_buff *sb;
 712                sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
 713                if (sb == NULL) {
 714                        printk
 715                            ("nicstar%d: can't allocate %dth of %d small buffers.\n",
 716                             i, j, NUM_SB);
 717                        error = 15;
 718                        ns_init_card_error(card, error);
 719                        return error;
 720                }
 721                NS_PRV_BUFTYPE(sb) = BUF_SM;
 722                skb_queue_tail(&card->sbpool.queue, sb);
 723                skb_reserve(sb, NS_AAL0_HEADER);
 724                push_rxbufs(card, sb);
 725        }
 726        /* Test for strange behaviour which leads to crashes */
 727        if ((bcount =
 728             ns_stat_sfbqc_get(readl(card->membase + STAT))) < card->sbnr.min) {
 729                printk
 730                    ("nicstar%d: Strange... Just allocated %d small buffers and sfbqc = %d.\n",
 731                     i, j, bcount);
 732                error = 15;
 733                ns_init_card_error(card, error);
 734                return error;
 735        }
 736
 737        /* Allocate iovec buffers */
 738        skb_queue_head_init(&card->iovpool.queue);
 739        card->iovpool.count = 0;
 740        for (j = 0; j < NUM_IOVB; j++) {
 741                struct sk_buff *iovb;
 742                iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
 743                if (iovb == NULL) {
 744                        printk
 745                            ("nicstar%d: can't allocate %dth of %d iovec buffers.\n",
 746                             i, j, NUM_IOVB);
 747                        error = 16;
 748                        ns_init_card_error(card, error);
 749                        return error;
 750                }
 751                NS_PRV_BUFTYPE(iovb) = BUF_NONE;
 752                skb_queue_tail(&card->iovpool.queue, iovb);
 753                card->iovpool.count++;
 754        }
 755
 756        /* Configure NICStAR */
 757        if (card->rct_size == 4096)
 758                ns_cfg_rctsize = NS_CFG_RCTSIZE_4096_ENTRIES;
 759        else                    /* (card->rct_size == 16384) */
 760                ns_cfg_rctsize = NS_CFG_RCTSIZE_16384_ENTRIES;
 761
 762        card->efbie = 1;
 763
 764        card->intcnt = 0;
 765        if (request_irq
 766            (pcidev->irq, &ns_irq_handler, IRQF_SHARED, "nicstar", card) != 0) {
 767                printk("nicstar%d: can't allocate IRQ %d.\n", i, pcidev->irq);
 768                error = 9;
 769                ns_init_card_error(card, error);
 770                return error;
 771        }
 772
 773        /* Register device */
 774        card->atmdev = atm_dev_register("nicstar", &card->pcidev->dev, &atm_ops,
 775                                        -1, NULL);
 776        if (card->atmdev == NULL) {
 777                printk("nicstar%d: can't register device.\n", i);
 778                error = 17;
 779                ns_init_card_error(card, error);
 780                return error;
 781        }
 782
 783        if (ns_parse_mac(mac[i], card->atmdev->esi)) {
 784                nicstar_read_eprom(card->membase, NICSTAR_EPROM_MAC_ADDR_OFFSET,
 785                                   card->atmdev->esi, 6);
 786                if (memcmp(card->atmdev->esi, "\x00\x00\x00\x00\x00\x00", 6) ==
 787                    0) {
 788                        nicstar_read_eprom(card->membase,
 789                                           NICSTAR_EPROM_MAC_ADDR_OFFSET_ALT,
 790                                           card->atmdev->esi, 6);
 791                }
 792        }
 793
 794        printk("nicstar%d: MAC address %pM\n", i, card->atmdev->esi);
 795
 796        card->atmdev->dev_data = card;
 797        card->atmdev->ci_range.vpi_bits = card->vpibits;
 798        card->atmdev->ci_range.vci_bits = card->vcibits;
 799        card->atmdev->link_rate = card->max_pcr;
 800        card->atmdev->phy = NULL;
 801
 802#ifdef CONFIG_ATM_NICSTAR_USE_SUNI
 803        if (card->max_pcr == ATM_OC3_PCR)
 804                suni_init(card->atmdev);
 805#endif /* CONFIG_ATM_NICSTAR_USE_SUNI */
 806
 807#ifdef CONFIG_ATM_NICSTAR_USE_IDT77105
 808        if (card->max_pcr == ATM_25_PCR)
 809                idt77105_init(card->atmdev);
 810#endif /* CONFIG_ATM_NICSTAR_USE_IDT77105 */
 811
 812        if (card->atmdev->phy && card->atmdev->phy->start)
 813                card->atmdev->phy->start(card->atmdev);
 814
 815        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 */
 816               NS_CFG_RSQAFIE | NS_CFG_TXEN | NS_CFG_TXIE | NS_CFG_TSQFIE_OPT | /* Only enabled if ENABLE_TSQFIE */
 817               NS_CFG_PHYIE, card->membase + CFG);
 818
 819        num_cards++;
 820
 821        return error;
 822}
 823
 824static void ns_init_card_error(ns_dev *card, int error)
 825{
 826        if (error >= 17) {
 827                writel(0x00000000, card->membase + CFG);
 828        }
 829        if (error >= 16) {
 830                struct sk_buff *iovb;
 831                while ((iovb = skb_dequeue(&card->iovpool.queue)) != NULL)
 832                        dev_kfree_skb_any(iovb);
 833        }
 834        if (error >= 15) {
 835                struct sk_buff *sb;
 836                while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
 837                        dev_kfree_skb_any(sb);
 838                free_scq(card, card->scq0, NULL);
 839        }
 840        if (error >= 14) {
 841                struct sk_buff *lb;
 842                while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
 843                        dev_kfree_skb_any(lb);
 844        }
 845        if (error >= 13) {
 846                struct sk_buff *hb;
 847                while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL)
 848                        dev_kfree_skb_any(hb);
 849        }
 850        if (error >= 12) {
 851                kfree(card->rsq.org);
 852        }
 853        if (error >= 11) {
 854                kfree(card->tsq.org);
 855        }
 856        if (error >= 10) {
 857                free_irq(card->pcidev->irq, card);
 858        }
 859        if (error >= 4) {
 860                iounmap(card->membase);
 861        }
 862        if (error >= 3) {
 863                pci_disable_device(card->pcidev);
 864                kfree(card);
 865        }
 866}
 867
 868static scq_info *get_scq(ns_dev *card, int size, u32 scd)
 869{
 870        scq_info *scq;
 871        int i;
 872
 873        if (size != VBR_SCQSIZE && size != CBR_SCQSIZE)
 874                return NULL;
 875
 876        scq = kmalloc(sizeof(scq_info), GFP_KERNEL);
 877        if (!scq)
 878                return NULL;
 879        scq->org = pci_alloc_consistent(card->pcidev, 2 * size, &scq->dma);
 880        if (!scq->org) {
 881                kfree(scq);
 882                return NULL;
 883        }
 884        scq->skb = kmalloc(sizeof(struct sk_buff *) *
 885                           (size / NS_SCQE_SIZE), GFP_KERNEL);
 886        if (!scq->skb) {
 887                kfree(scq->org);
 888                kfree(scq);
 889                return NULL;
 890        }
 891        scq->num_entries = size / NS_SCQE_SIZE;
 892        scq->base = PTR_ALIGN(scq->org, size);
 893        scq->next = scq->base;
 894        scq->last = scq->base + (scq->num_entries - 1);
 895        scq->tail = scq->last;
 896        scq->scd = scd;
 897        scq->num_entries = size / NS_SCQE_SIZE;
 898        scq->tbd_count = 0;
 899        init_waitqueue_head(&scq->scqfull_waitq);
 900        scq->full = 0;
 901        spin_lock_init(&scq->lock);
 902
 903        for (i = 0; i < scq->num_entries; i++)
 904                scq->skb[i] = NULL;
 905
 906        return scq;
 907}
 908
 909/* For variable rate SCQ vcc must be NULL */
 910static void free_scq(ns_dev *card, scq_info *scq, struct atm_vcc *vcc)
 911{
 912        int i;
 913
 914        if (scq->num_entries == VBR_SCQ_NUM_ENTRIES)
 915                for (i = 0; i < scq->num_entries; i++) {
 916                        if (scq->skb[i] != NULL) {
 917                                vcc = ATM_SKB(scq->skb[i])->vcc;
 918                                if (vcc->pop != NULL)
 919                                        vcc->pop(vcc, scq->skb[i]);
 920                                else
 921                                        dev_kfree_skb_any(scq->skb[i]);
 922                        }
 923        } else {                /* vcc must be != NULL */
 924
 925                if (vcc == NULL) {
 926                        printk
 927                            ("nicstar: free_scq() called with vcc == NULL for fixed rate scq.");
 928                        for (i = 0; i < scq->num_entries; i++)
 929                                dev_kfree_skb_any(scq->skb[i]);
 930                } else
 931                        for (i = 0; i < scq->num_entries; i++) {
 932                                if (scq->skb[i] != NULL) {
 933                                        if (vcc->pop != NULL)
 934                                                vcc->pop(vcc, scq->skb[i]);
 935                                        else
 936                                                dev_kfree_skb_any(scq->skb[i]);
 937                                }
 938                        }
 939        }
 940        kfree(scq->skb);
 941        pci_free_consistent(card->pcidev,
 942                            2 * (scq->num_entries == VBR_SCQ_NUM_ENTRIES ?
 943                                 VBR_SCQSIZE : CBR_SCQSIZE),
 944                            scq->org, scq->dma);
 945        kfree(scq);
 946}
 947
 948/* The handles passed must be pointers to the sk_buff containing the small
 949   or large buffer(s) cast to u32. */
 950static void push_rxbufs(ns_dev * card, struct sk_buff *skb)
 951{
 952        struct sk_buff *handle1, *handle2;
 953        u32 id1 = 0, id2 = 0;
 954        u32 addr1, addr2;
 955        u32 stat;
 956        unsigned long flags;
 957        int err;
 958
 959        /* *BARF* */
 960        handle2 = NULL;
 961        addr2 = 0;
 962        handle1 = skb;
 963        addr1 = pci_map_single(card->pcidev,
 964                               skb->data,
 965                               (NS_PRV_BUFTYPE(skb) == BUF_SM
 966                                ? NS_SMSKBSIZE : NS_LGSKBSIZE),
 967                               PCI_DMA_TODEVICE);
 968        NS_PRV_DMA(skb) = addr1; /* save so we can unmap later */
 969
 970#ifdef GENERAL_DEBUG
 971        if (!addr1)
 972                printk("nicstar%d: push_rxbufs called with addr1 = 0.\n",
 973                       card->index);
 974#endif /* GENERAL_DEBUG */
 975
 976        stat = readl(card->membase + STAT);
 977        card->sbfqc = ns_stat_sfbqc_get(stat);
 978        card->lbfqc = ns_stat_lfbqc_get(stat);
 979        if (NS_PRV_BUFTYPE(skb) == BUF_SM) {
 980                if (!addr2) {
 981                        if (card->sm_addr) {
 982                                addr2 = card->sm_addr;
 983                                handle2 = card->sm_handle;
 984                                card->sm_addr = 0x00000000;
 985                                card->sm_handle = 0x00000000;
 986                        } else {        /* (!sm_addr) */
 987
 988                                card->sm_addr = addr1;
 989                                card->sm_handle = handle1;
 990                        }
 991                }
 992        } else {                /* buf_type == BUF_LG */
 993
 994                if (!addr2) {
 995                        if (card->lg_addr) {
 996                                addr2 = card->lg_addr;
 997                                handle2 = card->lg_handle;
 998                                card->lg_addr = 0x00000000;
 999                                card->lg_handle = 0x00000000;
1000                        } else {        /* (!lg_addr) */
1001
1002                                card->lg_addr = addr1;
1003                                card->lg_handle = handle1;
1004                        }
1005                }
1006        }
1007
1008        if (addr2) {
1009                if (NS_PRV_BUFTYPE(skb) == BUF_SM) {
1010                        if (card->sbfqc >= card->sbnr.max) {
1011                                skb_unlink(handle1, &card->sbpool.queue);
1012                                dev_kfree_skb_any(handle1);
1013                                skb_unlink(handle2, &card->sbpool.queue);
1014                                dev_kfree_skb_any(handle2);
1015                                return;
1016                        } else
1017                                card->sbfqc += 2;
1018                } else {        /* (buf_type == BUF_LG) */
1019
1020                        if (card->lbfqc >= card->lbnr.max) {
1021                                skb_unlink(handle1, &card->lbpool.queue);
1022                                dev_kfree_skb_any(handle1);
1023                                skb_unlink(handle2, &card->lbpool.queue);
1024                                dev_kfree_skb_any(handle2);
1025                                return;
1026                        } else
1027                                card->lbfqc += 2;
1028                }
1029
1030                do {
1031                        if (!idr_pre_get(&card->idr, GFP_ATOMIC)) {
1032                                printk(KERN_ERR
1033                                       "nicstar%d: no free memory for idr\n",
1034                                       card->index);
1035                                goto out;
1036                        }
1037
1038                        if (!id1)
1039                                err = idr_get_new_above(&card->idr, handle1, 0, &id1);
1040
1041                        if (!id2 && err == 0)
1042                                err = idr_get_new_above(&card->idr, handle2, 0, &id2);
1043
1044                } while (err == -EAGAIN);
1045
1046                if (err)
1047                        goto out;
1048
1049                spin_lock_irqsave(&card->res_lock, flags);
1050                while (CMD_BUSY(card)) ;
1051                writel(addr2, card->membase + DR3);
1052                writel(id2, card->membase + DR2);
1053                writel(addr1, card->membase + DR1);
1054                writel(id1, card->membase + DR0);
1055                writel(NS_CMD_WRITE_FREEBUFQ | NS_PRV_BUFTYPE(skb),
1056                       card->membase + CMD);
1057                spin_unlock_irqrestore(&card->res_lock, flags);
1058
1059                XPRINTK("nicstar%d: Pushing %s buffers at 0x%x and 0x%x.\n",
1060                        card->index,
1061                        (NS_PRV_BUFTYPE(skb) == BUF_SM ? "small" : "large"),
1062                        addr1, addr2);
1063        }
1064
1065        if (!card->efbie && card->sbfqc >= card->sbnr.min &&
1066            card->lbfqc >= card->lbnr.min) {
1067                card->efbie = 1;
1068                writel((readl(card->membase + CFG) | NS_CFG_EFBIE),
1069                       card->membase + CFG);
1070        }
1071
1072out:
1073        return;
1074}
1075
1076static irqreturn_t ns_irq_handler(int irq, void *dev_id)
1077{
1078        u32 stat_r;
1079        ns_dev *card;
1080        struct atm_dev *dev;
1081        unsigned long flags;
1082
1083        card = (ns_dev *) dev_id;
1084        dev = card->atmdev;
1085        card->intcnt++;
1086
1087        PRINTK("nicstar%d: NICStAR generated an interrupt\n", card->index);
1088
1089        spin_lock_irqsave(&card->int_lock, flags);
1090
1091        stat_r = readl(card->membase + STAT);
1092
1093        /* Transmit Status Indicator has been written to T. S. Queue */
1094        if (stat_r & NS_STAT_TSIF) {
1095                TXPRINTK("nicstar%d: TSI interrupt\n", card->index);
1096                process_tsq(card);
1097                writel(NS_STAT_TSIF, card->membase + STAT);
1098        }
1099
1100        /* Incomplete CS-PDU has been transmitted */
1101        if (stat_r & NS_STAT_TXICP) {
1102                writel(NS_STAT_TXICP, card->membase + STAT);
1103                TXPRINTK("nicstar%d: Incomplete CS-PDU transmitted.\n",
1104                         card->index);
1105        }
1106
1107        /* Transmit Status Queue 7/8 full */
1108        if (stat_r & NS_STAT_TSQF) {
1109                writel(NS_STAT_TSQF, card->membase + STAT);
1110                PRINTK("nicstar%d: TSQ full.\n", card->index);
1111                process_tsq(card);
1112        }
1113
1114        /* Timer overflow */
1115        if (stat_r & NS_STAT_TMROF) {
1116                writel(NS_STAT_TMROF, card->membase + STAT);
1117                PRINTK("nicstar%d: Timer overflow.\n", card->index);
1118        }
1119
1120        /* PHY device interrupt signal active */
1121        if (stat_r & NS_STAT_PHYI) {
1122                writel(NS_STAT_PHYI, card->membase + STAT);
1123                PRINTK("nicstar%d: PHY interrupt.\n", card->index);
1124                if (dev->phy && dev->phy->interrupt) {
1125                        dev->phy->interrupt(dev);
1126                }
1127        }
1128
1129        /* Small Buffer Queue is full */
1130        if (stat_r & NS_STAT_SFBQF) {
1131                writel(NS_STAT_SFBQF, card->membase + STAT);
1132                printk("nicstar%d: Small free buffer queue is full.\n",
1133                       card->index);
1134        }
1135
1136        /* Large Buffer Queue is full */
1137        if (stat_r & NS_STAT_LFBQF) {
1138                writel(NS_STAT_LFBQF, card->membase + STAT);
1139                printk("nicstar%d: Large free buffer queue is full.\n",
1140                       card->index);
1141        }
1142
1143        /* Receive Status Queue is full */
1144        if (stat_r & NS_STAT_RSQF) {
1145                writel(NS_STAT_RSQF, card->membase + STAT);
1146                printk("nicstar%d: RSQ full.\n", card->index);
1147                process_rsq(card);
1148        }
1149
1150        /* Complete CS-PDU received */
1151        if (stat_r & NS_STAT_EOPDU) {
1152                RXPRINTK("nicstar%d: End of CS-PDU received.\n", card->index);
1153                process_rsq(card);
1154                writel(NS_STAT_EOPDU, card->membase + STAT);
1155        }
1156
1157        /* Raw cell received */
1158        if (stat_r & NS_STAT_RAWCF) {
1159                writel(NS_STAT_RAWCF, card->membase + STAT);
1160#ifndef RCQ_SUPPORT
1161                printk("nicstar%d: Raw cell received and no support yet...\n",
1162                       card->index);
1163#endif /* RCQ_SUPPORT */
1164                /* NOTE: the following procedure may keep a raw cell pending until the
1165                   next interrupt. As this preliminary support is only meant to
1166                   avoid buffer leakage, this is not an issue. */
1167                while (readl(card->membase + RAWCT) != card->rawch) {
1168
1169                        if (ns_rcqe_islast(card->rawcell)) {
1170                                struct sk_buff *oldbuf;
1171
1172                                oldbuf = card->rcbuf;
1173                                card->rcbuf = idr_find(&card->idr,
1174                                                       ns_rcqe_nextbufhandle(card->rawcell));
1175                                card->rawch = NS_PRV_DMA(card->rcbuf);
1176                                card->rawcell = (struct ns_rcqe *)
1177                                                card->rcbuf->data;
1178                                recycle_rx_buf(card, oldbuf);
1179                        } else {
1180                                card->rawch += NS_RCQE_SIZE;
1181                                card->rawcell++;
1182                        }
1183                }
1184        }
1185
1186        /* Small buffer queue is empty */
1187        if (stat_r & NS_STAT_SFBQE) {
1188                int i;
1189                struct sk_buff *sb;
1190
1191                writel(NS_STAT_SFBQE, card->membase + STAT);
1192                printk("nicstar%d: Small free buffer queue empty.\n",
1193                       card->index);
1194                for (i = 0; i < card->sbnr.min; i++) {
1195                        sb = dev_alloc_skb(NS_SMSKBSIZE);
1196                        if (sb == NULL) {
1197                                writel(readl(card->membase + CFG) &
1198                                       ~NS_CFG_EFBIE, card->membase + CFG);
1199                                card->efbie = 0;
1200                                break;
1201                        }
1202                        NS_PRV_BUFTYPE(sb) = BUF_SM;
1203                        skb_queue_tail(&card->sbpool.queue, sb);
1204                        skb_reserve(sb, NS_AAL0_HEADER);
1205                        push_rxbufs(card, sb);
1206                }
1207                card->sbfqc = i;
1208                process_rsq(card);
1209        }
1210
1211        /* Large buffer queue empty */
1212        if (stat_r & NS_STAT_LFBQE) {
1213                int i;
1214                struct sk_buff *lb;
1215
1216                writel(NS_STAT_LFBQE, card->membase + STAT);
1217                printk("nicstar%d: Large free buffer queue empty.\n",
1218                       card->index);
1219                for (i = 0; i < card->lbnr.min; i++) {
1220                        lb = dev_alloc_skb(NS_LGSKBSIZE);
1221                        if (lb == NULL) {
1222                                writel(readl(card->membase + CFG) &
1223                                       ~NS_CFG_EFBIE, card->membase + CFG);
1224                                card->efbie = 0;
1225                                break;
1226                        }
1227                        NS_PRV_BUFTYPE(lb) = BUF_LG;
1228                        skb_queue_tail(&card->lbpool.queue, lb);
1229                        skb_reserve(lb, NS_SMBUFSIZE);
1230                        push_rxbufs(card, lb);
1231                }
1232                card->lbfqc = i;
1233                process_rsq(card);
1234        }
1235
1236        /* Receive Status Queue is 7/8 full */
1237        if (stat_r & NS_STAT_RSQAF) {
1238                writel(NS_STAT_RSQAF, card->membase + STAT);
1239                RXPRINTK("nicstar%d: RSQ almost full.\n", card->index);
1240                process_rsq(card);
1241        }
1242
1243        spin_unlock_irqrestore(&card->int_lock, flags);
1244        PRINTK("nicstar%d: end of interrupt service\n", card->index);
1245        return IRQ_HANDLED;
1246}
1247
1248static int ns_open(struct atm_vcc *vcc)
1249{
1250        ns_dev *card;
1251        vc_map *vc;
1252        unsigned long tmpl, modl;
1253        int tcr, tcra;          /* target cell rate, and absolute value */
1254        int n = 0;              /* Number of entries in the TST. Initialized to remove
1255                                   the compiler warning. */
1256        u32 u32d[4];
1257        int frscdi = 0;         /* Index of the SCD. Initialized to remove the compiler
1258                                   warning. How I wish compilers were clever enough to
1259                                   tell which variables can truly be used
1260                                   uninitialized... */
1261        int inuse;              /* tx or rx vc already in use by another vcc */
1262        short vpi = vcc->vpi;
1263        int vci = vcc->vci;
1264
1265        card = (ns_dev *) vcc->dev->dev_data;
1266        PRINTK("nicstar%d: opening vpi.vci %d.%d \n", card->index, (int)vpi,
1267               vci);
1268        if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0) {
1269                PRINTK("nicstar%d: unsupported AAL.\n", card->index);
1270                return -EINVAL;
1271        }
1272
1273        vc = &(card->vcmap[vpi << card->vcibits | vci]);
1274        vcc->dev_data = vc;
1275
1276        inuse = 0;
1277        if (vcc->qos.txtp.traffic_class != ATM_NONE && vc->tx)
1278                inuse = 1;
1279        if (vcc->qos.rxtp.traffic_class != ATM_NONE && vc->rx)
1280                inuse += 2;
1281        if (inuse) {
1282                printk("nicstar%d: %s vci already in use.\n", card->index,
1283                       inuse == 1 ? "tx" : inuse == 2 ? "rx" : "tx and rx");
1284                return -EINVAL;
1285        }
1286
1287        set_bit(ATM_VF_ADDR, &vcc->flags);
1288
1289        /* NOTE: You are not allowed to modify an open connection's QOS. To change
1290           that, remove the ATM_VF_PARTIAL flag checking. There may be other changes
1291           needed to do that. */
1292        if (!test_bit(ATM_VF_PARTIAL, &vcc->flags)) {
1293                scq_info *scq;
1294
1295                set_bit(ATM_VF_PARTIAL, &vcc->flags);
1296                if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1297                        /* Check requested cell rate and availability of SCD */
1298                        if (vcc->qos.txtp.max_pcr == 0 && vcc->qos.txtp.pcr == 0
1299                            && vcc->qos.txtp.min_pcr == 0) {
1300                                PRINTK
1301                                    ("nicstar%d: trying to open a CBR vc with cell rate = 0 \n",
1302                                     card->index);
1303                                clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1304                                clear_bit(ATM_VF_ADDR, &vcc->flags);
1305                                return -EINVAL;
1306                        }
1307
1308                        tcr = atm_pcr_goal(&(vcc->qos.txtp));
1309                        tcra = tcr >= 0 ? tcr : -tcr;
1310
1311                        PRINTK("nicstar%d: target cell rate = %d.\n",
1312                               card->index, vcc->qos.txtp.max_pcr);
1313
1314                        tmpl =
1315                            (unsigned long)tcra *(unsigned long)
1316                            NS_TST_NUM_ENTRIES;
1317                        modl = tmpl % card->max_pcr;
1318
1319                        n = (int)(tmpl / card->max_pcr);
1320                        if (tcr > 0) {
1321                                if (modl > 0)
1322                                        n++;
1323                        } else if (tcr == 0) {
1324                                if ((n =
1325                                     (card->tst_free_entries -
1326                                      NS_TST_RESERVED)) <= 0) {
1327                                        PRINTK
1328                                            ("nicstar%d: no CBR bandwidth free.\n",
1329                                             card->index);
1330                                        clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1331                                        clear_bit(ATM_VF_ADDR, &vcc->flags);
1332                                        return -EINVAL;
1333                                }
1334                        }
1335
1336                        if (n == 0) {
1337                                printk
1338                                    ("nicstar%d: selected bandwidth < granularity.\n",
1339                                     card->index);
1340                                clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1341                                clear_bit(ATM_VF_ADDR, &vcc->flags);
1342                                return -EINVAL;
1343                        }
1344
1345                        if (n > (card->tst_free_entries - NS_TST_RESERVED)) {
1346                                PRINTK
1347                                    ("nicstar%d: not enough free CBR bandwidth.\n",
1348                                     card->index);
1349                                clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1350                                clear_bit(ATM_VF_ADDR, &vcc->flags);
1351                                return -EINVAL;
1352                        } else
1353                                card->tst_free_entries -= n;
1354
1355                        XPRINTK("nicstar%d: writing %d tst entries.\n",
1356                                card->index, n);
1357                        for (frscdi = 0; frscdi < NS_FRSCD_NUM; frscdi++) {
1358                                if (card->scd2vc[frscdi] == NULL) {
1359                                        card->scd2vc[frscdi] = vc;
1360                                        break;
1361                                }
1362                        }
1363                        if (frscdi == NS_FRSCD_NUM) {
1364                                PRINTK
1365                                    ("nicstar%d: no SCD available for CBR channel.\n",
1366                                     card->index);
1367                                card->tst_free_entries += n;
1368                                clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1369                                clear_bit(ATM_VF_ADDR, &vcc->flags);
1370                                return -EBUSY;
1371                        }
1372
1373                        vc->cbr_scd = NS_FRSCD + frscdi * NS_FRSCD_SIZE;
1374
1375                        scq = get_scq(card, CBR_SCQSIZE, vc->cbr_scd);
1376                        if (scq == NULL) {
1377                                PRINTK("nicstar%d: can't get fixed rate SCQ.\n",
1378                                       card->index);
1379                                card->scd2vc[frscdi] = NULL;
1380                                card->tst_free_entries += n;
1381                                clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1382                                clear_bit(ATM_VF_ADDR, &vcc->flags);
1383                                return -ENOMEM;
1384                        }
1385                        vc->scq = scq;
1386                        u32d[0] = scq_virt_to_bus(scq, scq->base);
1387                        u32d[1] = (u32) 0x00000000;
1388                        u32d[2] = (u32) 0xffffffff;
1389                        u32d[3] = (u32) 0x00000000;
1390                        ns_write_sram(card, vc->cbr_scd, u32d, 4);
1391
1392                        fill_tst(card, n, vc);
1393                } else if (vcc->qos.txtp.traffic_class == ATM_UBR) {
1394                        vc->cbr_scd = 0x00000000;
1395                        vc->scq = card->scq0;
1396                }
1397
1398                if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1399                        vc->tx = 1;
1400                        vc->tx_vcc = vcc;
1401                        vc->tbd_count = 0;
1402                }
1403                if (vcc->qos.rxtp.traffic_class != ATM_NONE) {
1404                        u32 status;
1405
1406                        vc->rx = 1;
1407                        vc->rx_vcc = vcc;
1408                        vc->rx_iov = NULL;
1409
1410                        /* Open the connection in hardware */
1411                        if (vcc->qos.aal == ATM_AAL5)
1412                                status = NS_RCTE_AAL5 | NS_RCTE_CONNECTOPEN;
1413                        else    /* vcc->qos.aal == ATM_AAL0 */
1414                                status = NS_RCTE_AAL0 | NS_RCTE_CONNECTOPEN;
1415#ifdef RCQ_SUPPORT
1416                        status |= NS_RCTE_RAWCELLINTEN;
1417#endif /* RCQ_SUPPORT */
1418                        ns_write_sram(card,
1419                                      NS_RCT +
1420                                      (vpi << card->vcibits | vci) *
1421                                      NS_RCT_ENTRY_SIZE, &status, 1);
1422                }
1423
1424        }
1425
1426        set_bit(ATM_VF_READY, &vcc->flags);
1427        return 0;
1428}
1429
1430static void ns_close(struct atm_vcc *vcc)
1431{
1432        vc_map *vc;
1433        ns_dev *card;
1434        u32 data;
1435        int i;
1436
1437        vc = vcc->dev_data;
1438        card = vcc->dev->dev_data;
1439        PRINTK("nicstar%d: closing vpi.vci %d.%d \n", card->index,
1440               (int)vcc->vpi, vcc->vci);
1441
1442        clear_bit(ATM_VF_READY, &vcc->flags);
1443
1444        if (vcc->qos.rxtp.traffic_class != ATM_NONE) {
1445                u32 addr;
1446                unsigned long flags;
1447
1448                addr =
1449                    NS_RCT +
1450                    (vcc->vpi << card->vcibits | vcc->vci) * NS_RCT_ENTRY_SIZE;
1451                spin_lock_irqsave(&card->res_lock, flags);
1452                while (CMD_BUSY(card)) ;
1453                writel(NS_CMD_CLOSE_CONNECTION | addr << 2,
1454                       card->membase + CMD);
1455                spin_unlock_irqrestore(&card->res_lock, flags);
1456
1457                vc->rx = 0;
1458                if (vc->rx_iov != NULL) {
1459                        struct sk_buff *iovb;
1460                        u32 stat;
1461
1462                        stat = readl(card->membase + STAT);
1463                        card->sbfqc = ns_stat_sfbqc_get(stat);
1464                        card->lbfqc = ns_stat_lfbqc_get(stat);
1465
1466                        PRINTK
1467                            ("nicstar%d: closing a VC with pending rx buffers.\n",
1468                             card->index);
1469                        iovb = vc->rx_iov;
1470                        recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
1471                                              NS_PRV_IOVCNT(iovb));
1472                        NS_PRV_IOVCNT(iovb) = 0;
1473                        spin_lock_irqsave(&card->int_lock, flags);
1474                        recycle_iov_buf(card, iovb);
1475                        spin_unlock_irqrestore(&card->int_lock, flags);
1476                        vc->rx_iov = NULL;
1477                }
1478        }
1479
1480        if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1481                vc->tx = 0;
1482        }
1483
1484        if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1485                unsigned long flags;
1486                ns_scqe *scqep;
1487                scq_info *scq;
1488
1489                scq = vc->scq;
1490
1491                for (;;) {
1492                        spin_lock_irqsave(&scq->lock, flags);
1493                        scqep = scq->next;
1494                        if (scqep == scq->base)
1495                                scqep = scq->last;
1496                        else
1497                                scqep--;
1498                        if (scqep == scq->tail) {
1499                                spin_unlock_irqrestore(&scq->lock, flags);
1500                                break;
1501                        }
1502                        /* If the last entry is not a TSR, place one in the SCQ in order to
1503                           be able to completely drain it and then close. */
1504                        if (!ns_scqe_is_tsr(scqep) && scq->tail != scq->next) {
1505                                ns_scqe tsr;
1506                                u32 scdi, scqi;
1507                                u32 data;
1508                                int index;
1509
1510                                tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
1511                                scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
1512                                scqi = scq->next - scq->base;
1513                                tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
1514                                tsr.word_3 = 0x00000000;
1515                                tsr.word_4 = 0x00000000;
1516                                *scq->next = tsr;
1517                                index = (int)scqi;
1518                                scq->skb[index] = NULL;
1519                                if (scq->next == scq->last)
1520                                        scq->next = scq->base;
1521                                else
1522                                        scq->next++;
1523                                data = scq_virt_to_bus(scq, scq->next);
1524                                ns_write_sram(card, scq->scd, &data, 1);
1525                        }
1526                        spin_unlock_irqrestore(&scq->lock, flags);
1527                        schedule();
1528                }
1529
1530                /* Free all TST entries */
1531                data = NS_TST_OPCODE_VARIABLE;
1532                for (i = 0; i < NS_TST_NUM_ENTRIES; i++) {
1533                        if (card->tste2vc[i] == vc) {
1534                                ns_write_sram(card, card->tst_addr + i, &data,
1535                                              1);
1536                                card->tste2vc[i] = NULL;
1537                                card->tst_free_entries++;
1538                        }
1539                }
1540
1541                card->scd2vc[(vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE] = NULL;
1542                free_scq(card, vc->scq, vcc);
1543        }
1544
1545        /* remove all references to vcc before deleting it */
1546        if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1547                unsigned long flags;
1548                scq_info *scq = card->scq0;
1549
1550                spin_lock_irqsave(&scq->lock, flags);
1551
1552                for (i = 0; i < scq->num_entries; i++) {
1553                        if (scq->skb[i] && ATM_SKB(scq->skb[i])->vcc == vcc) {
1554                                ATM_SKB(scq->skb[i])->vcc = NULL;
1555                                atm_return(vcc, scq->skb[i]->truesize);
1556                                PRINTK
1557                                    ("nicstar: deleted pending vcc mapping\n");
1558                        }
1559                }
1560
1561                spin_unlock_irqrestore(&scq->lock, flags);
1562        }
1563
1564        vcc->dev_data = NULL;
1565        clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1566        clear_bit(ATM_VF_ADDR, &vcc->flags);
1567
1568#ifdef RX_DEBUG
1569        {
1570                u32 stat, cfg;
1571                stat = readl(card->membase + STAT);
1572                cfg = readl(card->membase + CFG);
1573                printk("STAT = 0x%08X  CFG = 0x%08X  \n", stat, cfg);
1574                printk
1575                    ("TSQ: base = 0x%p  next = 0x%p  last = 0x%p  TSQT = 0x%08X \n",
1576                     card->tsq.base, card->tsq.next,
1577                     card->tsq.last, readl(card->membase + TSQT));
1578                printk
1579                    ("RSQ: base = 0x%p  next = 0x%p  last = 0x%p  RSQT = 0x%08X \n",
1580                     card->rsq.base, card->rsq.next,
1581                     card->rsq.last, readl(card->membase + RSQT));
1582                printk("Empty free buffer queue interrupt %s \n",
1583                       card->efbie ? "enabled" : "disabled");
1584                printk("SBCNT = %d  count = %d   LBCNT = %d count = %d \n",
1585                       ns_stat_sfbqc_get(stat), card->sbpool.count,
1586                       ns_stat_lfbqc_get(stat), card->lbpool.count);
1587                printk("hbpool.count = %d  iovpool.count = %d \n",
1588                       card->hbpool.count, card->iovpool.count);
1589        }
1590#endif /* RX_DEBUG */
1591}
1592
1593static void fill_tst(ns_dev * card, int n, vc_map * vc)
1594{
1595        u32 new_tst;
1596        unsigned long cl;
1597        int e, r;
1598        u32 data;
1599
1600        /* It would be very complicated to keep the two TSTs synchronized while
1601           assuring that writes are only made to the inactive TST. So, for now I
1602           will use only one TST. If problems occur, I will change this again */
1603
1604        new_tst = card->tst_addr;
1605
1606        /* Fill procedure */
1607
1608        for (e = 0; e < NS_TST_NUM_ENTRIES; e++) {
1609                if (card->tste2vc[e] == NULL)
1610                        break;
1611        }
1612        if (e == NS_TST_NUM_ENTRIES) {
1613                printk("nicstar%d: No free TST entries found. \n", card->index);
1614                return;
1615        }
1616
1617        r = n;
1618        cl = NS_TST_NUM_ENTRIES;
1619        data = ns_tste_make(NS_TST_OPCODE_FIXED, vc->cbr_scd);
1620
1621        while (r > 0) {
1622                if (cl >= NS_TST_NUM_ENTRIES && card->tste2vc[e] == NULL) {
1623                        card->tste2vc[e] = vc;
1624                        ns_write_sram(card, new_tst + e, &data, 1);
1625                        cl -= NS_TST_NUM_ENTRIES;
1626                        r--;
1627                }
1628
1629                if (++e == NS_TST_NUM_ENTRIES) {
1630                        e = 0;
1631                }
1632                cl += n;
1633        }
1634
1635        /* End of fill procedure */
1636
1637        data = ns_tste_make(NS_TST_OPCODE_END, new_tst);
1638        ns_write_sram(card, new_tst + NS_TST_NUM_ENTRIES, &data, 1);
1639        ns_write_sram(card, card->tst_addr + NS_TST_NUM_ENTRIES, &data, 1);
1640        card->tst_addr = new_tst;
1641}
1642
1643static int ns_send(struct atm_vcc *vcc, struct sk_buff *skb)
1644{
1645        ns_dev *card;
1646        vc_map *vc;
1647        scq_info *scq;
1648        unsigned long buflen;
1649        ns_scqe scqe;
1650        u32 flags;              /* TBD flags, not CPU flags */
1651
1652        card = vcc->dev->dev_data;
1653        TXPRINTK("nicstar%d: ns_send() called.\n", card->index);
1654        if ((vc = (vc_map *) vcc->dev_data) == NULL) {
1655                printk("nicstar%d: vcc->dev_data == NULL on ns_send().\n",
1656                       card->index);
1657                atomic_inc(&vcc->stats->tx_err);
1658                dev_kfree_skb_any(skb);
1659                return -EINVAL;
1660        }
1661
1662        if (!vc->tx) {
1663                printk("nicstar%d: Trying to transmit on a non-tx VC.\n",
1664                       card->index);
1665                atomic_inc(&vcc->stats->tx_err);
1666                dev_kfree_skb_any(skb);
1667                return -EINVAL;
1668        }
1669
1670        if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0) {
1671                printk("nicstar%d: Only AAL0 and AAL5 are supported.\n",
1672                       card->index);
1673                atomic_inc(&vcc->stats->tx_err);
1674                dev_kfree_skb_any(skb);
1675                return -EINVAL;
1676        }
1677
1678        if (skb_shinfo(skb)->nr_frags != 0) {
1679                printk("nicstar%d: No scatter-gather yet.\n", card->index);
1680                atomic_inc(&vcc->stats->tx_err);
1681                dev_kfree_skb_any(skb);
1682                return -EINVAL;
1683        }
1684
1685        ATM_SKB(skb)->vcc = vcc;
1686
1687        NS_PRV_DMA(skb) = pci_map_single(card->pcidev, skb->data,
1688                                         skb->len, PCI_DMA_TODEVICE);
1689
1690        if (vcc->qos.aal == ATM_AAL5) {
1691                buflen = (skb->len + 47 + 8) / 48 * 48; /* Multiple of 48 */
1692                flags = NS_TBD_AAL5;
1693                scqe.word_2 = cpu_to_le32(NS_PRV_DMA(skb));
1694                scqe.word_3 = cpu_to_le32(skb->len);
1695                scqe.word_4 =
1696                    ns_tbd_mkword_4(0, (u32) vcc->vpi, (u32) vcc->vci, 0,
1697                                    ATM_SKB(skb)->
1698                                    atm_options & ATM_ATMOPT_CLP ? 1 : 0);
1699                flags |= NS_TBD_EOPDU;
1700        } else {                /* (vcc->qos.aal == ATM_AAL0) */
1701
1702                buflen = ATM_CELL_PAYLOAD;      /* i.e., 48 bytes */
1703                flags = NS_TBD_AAL0;
1704                scqe.word_2 = cpu_to_le32(NS_PRV_DMA(skb) + NS_AAL0_HEADER);
1705                scqe.word_3 = cpu_to_le32(0x00000000);
1706                if (*skb->data & 0x02)  /* Payload type 1 - end of pdu */
1707                        flags |= NS_TBD_EOPDU;
1708                scqe.word_4 =
1709                    cpu_to_le32(*((u32 *) skb->data) & ~NS_TBD_VC_MASK);
1710                /* Force the VPI/VCI to be the same as in VCC struct */
1711                scqe.word_4 |=
1712                    cpu_to_le32((((u32) vcc->
1713                                  vpi) << NS_TBD_VPI_SHIFT | ((u32) vcc->
1714                                                              vci) <<
1715                                 NS_TBD_VCI_SHIFT) & NS_TBD_VC_MASK);
1716        }
1717
1718        if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1719                scqe.word_1 = ns_tbd_mkword_1_novbr(flags, (u32) buflen);
1720                scq = ((vc_map *) vcc->dev_data)->scq;
1721        } else {
1722                scqe.word_1 =
1723                    ns_tbd_mkword_1(flags, (u32) 1, (u32) 1, (u32) buflen);
1724                scq = card->scq0;
1725        }
1726
1727        if (push_scqe(card, vc, scq, &scqe, skb) != 0) {
1728                atomic_inc(&vcc->stats->tx_err);
1729                dev_kfree_skb_any(skb);
1730                return -EIO;
1731        }
1732        atomic_inc(&vcc->stats->tx);
1733
1734        return 0;
1735}
1736
1737static int push_scqe(ns_dev * card, vc_map * vc, scq_info * scq, ns_scqe * tbd,
1738                     struct sk_buff *skb)
1739{
1740        unsigned long flags;
1741        ns_scqe tsr;
1742        u32 scdi, scqi;
1743        int scq_is_vbr;
1744        u32 data;
1745        int index;
1746
1747        spin_lock_irqsave(&scq->lock, flags);
1748        while (scq->tail == scq->next) {
1749                if (in_interrupt()) {
1750                        spin_unlock_irqrestore(&scq->lock, flags);
1751                        printk("nicstar%d: Error pushing TBD.\n", card->index);
1752                        return 1;
1753                }
1754
1755                scq->full = 1;
1756                spin_unlock_irqrestore(&scq->lock, flags);
1757                interruptible_sleep_on_timeout(&scq->scqfull_waitq,
1758                                               SCQFULL_TIMEOUT);
1759                spin_lock_irqsave(&scq->lock, flags);
1760
1761                if (scq->full) {
1762                        spin_unlock_irqrestore(&scq->lock, flags);
1763                        printk("nicstar%d: Timeout pushing TBD.\n",
1764                               card->index);
1765                        return 1;
1766                }
1767        }
1768        *scq->next = *tbd;
1769        index = (int)(scq->next - scq->base);
1770        scq->skb[index] = skb;
1771        XPRINTK("nicstar%d: sending skb at 0x%p (pos %d).\n",
1772                card->index, skb, index);
1773        XPRINTK("nicstar%d: TBD written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%p.\n",
1774                card->index, le32_to_cpu(tbd->word_1), le32_to_cpu(tbd->word_2),
1775                le32_to_cpu(tbd->word_3), le32_to_cpu(tbd->word_4),
1776                scq->next);
1777        if (scq->next == scq->last)
1778                scq->next = scq->base;
1779        else
1780                scq->next++;
1781
1782        vc->tbd_count++;
1783        if (scq->num_entries == VBR_SCQ_NUM_ENTRIES) {
1784                scq->tbd_count++;
1785                scq_is_vbr = 1;
1786        } else
1787                scq_is_vbr = 0;
1788
1789        if (vc->tbd_count >= MAX_TBD_PER_VC
1790            || scq->tbd_count >= MAX_TBD_PER_SCQ) {
1791                int has_run = 0;
1792
1793                while (scq->tail == scq->next) {
1794                        if (in_interrupt()) {
1795                                data = scq_virt_to_bus(scq, scq->next);
1796                                ns_write_sram(card, scq->scd, &data, 1);
1797                                spin_unlock_irqrestore(&scq->lock, flags);
1798                                printk("nicstar%d: Error pushing TSR.\n",
1799                                       card->index);
1800                                return 0;
1801                        }
1802
1803                        scq->full = 1;
1804                        if (has_run++)
1805                                break;
1806                        spin_unlock_irqrestore(&scq->lock, flags);
1807                        interruptible_sleep_on_timeout(&scq->scqfull_waitq,
1808                                                       SCQFULL_TIMEOUT);
1809                        spin_lock_irqsave(&scq->lock, flags);
1810                }
1811
1812                if (!scq->full) {
1813                        tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
1814                        if (scq_is_vbr)
1815                                scdi = NS_TSR_SCDISVBR;
1816                        else
1817                                scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
1818                        scqi = scq->next - scq->base;
1819                        tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
1820                        tsr.word_3 = 0x00000000;
1821                        tsr.word_4 = 0x00000000;
1822
1823                        *scq->next = tsr;
1824                        index = (int)scqi;
1825                        scq->skb[index] = NULL;
1826                        XPRINTK
1827                            ("nicstar%d: TSR written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%p.\n",
1828                             card->index, le32_to_cpu(tsr.word_1),
1829                             le32_to_cpu(tsr.word_2), le32_to_cpu(tsr.word_3),
1830                             le32_to_cpu(tsr.word_4), scq->next);
1831                        if (scq->next == scq->last)
1832                                scq->next = scq->base;
1833                        else
1834                                scq->next++;
1835                        vc->tbd_count = 0;
1836                        scq->tbd_count = 0;
1837                } else
1838                        PRINTK("nicstar%d: Timeout pushing TSR.\n",
1839                               card->index);
1840        }
1841        data = scq_virt_to_bus(scq, scq->next);
1842        ns_write_sram(card, scq->scd, &data, 1);
1843
1844        spin_unlock_irqrestore(&scq->lock, flags);
1845
1846        return 0;
1847}
1848
1849static void process_tsq(ns_dev * card)
1850{
1851        u32 scdi;
1852        scq_info *scq;
1853        ns_tsi *previous = NULL, *one_ahead, *two_ahead;
1854        int serviced_entries;   /* flag indicating at least on entry was serviced */
1855
1856        serviced_entries = 0;
1857
1858        if (card->tsq.next == card->tsq.last)
1859                one_ahead = card->tsq.base;
1860        else
1861                one_ahead = card->tsq.next + 1;
1862
1863        if (one_ahead == card->tsq.last)
1864                two_ahead = card->tsq.base;
1865        else
1866                two_ahead = one_ahead + 1;
1867
1868        while (!ns_tsi_isempty(card->tsq.next) || !ns_tsi_isempty(one_ahead) ||
1869               !ns_tsi_isempty(two_ahead))
1870                /* At most two empty, as stated in the 77201 errata */
1871        {
1872                serviced_entries = 1;
1873
1874                /* Skip the one or two possible empty entries */
1875                while (ns_tsi_isempty(card->tsq.next)) {
1876                        if (card->tsq.next == card->tsq.last)
1877                                card->tsq.next = card->tsq.base;
1878                        else
1879                                card->tsq.next++;
1880                }
1881
1882                if (!ns_tsi_tmrof(card->tsq.next)) {
1883                        scdi = ns_tsi_getscdindex(card->tsq.next);
1884                        if (scdi == NS_TSI_SCDISVBR)
1885                                scq = card->scq0;
1886                        else {
1887                                if (card->scd2vc[scdi] == NULL) {
1888                                        printk
1889                                            ("nicstar%d: could not find VC from SCD index.\n",
1890                                             card->index);
1891                                        ns_tsi_init(card->tsq.next);
1892                                        return;
1893                                }
1894                                scq = card->scd2vc[scdi]->scq;
1895                        }
1896                        drain_scq(card, scq, ns_tsi_getscqpos(card->tsq.next));
1897                        scq->full = 0;
1898                        wake_up_interruptible(&(scq->scqfull_waitq));
1899                }
1900
1901                ns_tsi_init(card->tsq.next);
1902                previous = card->tsq.next;
1903                if (card->tsq.next == card->tsq.last)
1904                        card->tsq.next = card->tsq.base;
1905                else
1906                        card->tsq.next++;
1907
1908                if (card->tsq.next == card->tsq.last)
1909                        one_ahead = card->tsq.base;
1910                else
1911                        one_ahead = card->tsq.next + 1;
1912
1913                if (one_ahead == card->tsq.last)
1914                        two_ahead = card->tsq.base;
1915                else
1916                        two_ahead = one_ahead + 1;
1917        }
1918
1919        if (serviced_entries)
1920                writel(PTR_DIFF(previous, card->tsq.base),
1921                       card->membase + TSQH);
1922}
1923
1924static void drain_scq(ns_dev * card, scq_info * scq, int pos)
1925{
1926        struct atm_vcc *vcc;
1927        struct sk_buff *skb;
1928        int i;
1929        unsigned long flags;
1930
1931        XPRINTK("nicstar%d: drain_scq() called, scq at 0x%p, pos %d.\n",
1932                card->index, scq, pos);
1933        if (pos >= scq->num_entries) {
1934                printk("nicstar%d: Bad index on drain_scq().\n", card->index);
1935                return;
1936        }
1937
1938        spin_lock_irqsave(&scq->lock, flags);
1939        i = (int)(scq->tail - scq->base);
1940        if (++i == scq->num_entries)
1941                i = 0;
1942        while (i != pos) {
1943                skb = scq->skb[i];
1944                XPRINTK("nicstar%d: freeing skb at 0x%p (index %d).\n",
1945                        card->index, skb, i);
1946                if (skb != NULL) {
1947                        pci_unmap_single(card->pcidev,
1948                                         NS_PRV_DMA(skb),
1949                                         skb->len,
1950                                         PCI_DMA_TODEVICE);
1951                        vcc = ATM_SKB(skb)->vcc;
1952                        if (vcc && vcc->pop != NULL) {
1953                                vcc->pop(vcc, skb);
1954                        } else {
1955                                dev_kfree_skb_irq(skb);
1956                        }
1957                        scq->skb[i] = NULL;
1958                }
1959                if (++i == scq->num_entries)
1960                        i = 0;
1961        }
1962        scq->tail = scq->base + pos;
1963        spin_unlock_irqrestore(&scq->lock, flags);
1964}
1965
1966static void process_rsq(ns_dev * card)
1967{
1968        ns_rsqe *previous;
1969
1970        if (!ns_rsqe_valid(card->rsq.next))
1971                return;
1972        do {
1973                dequeue_rx(card, card->rsq.next);
1974                ns_rsqe_init(card->rsq.next);
1975                previous = card->rsq.next;
1976                if (card->rsq.next == card->rsq.last)
1977                        card->rsq.next = card->rsq.base;
1978                else
1979                        card->rsq.next++;
1980        } while (ns_rsqe_valid(card->rsq.next));
1981        writel(PTR_DIFF(previous, card->rsq.base), card->membase + RSQH);
1982}
1983
1984static void dequeue_rx(ns_dev * card, ns_rsqe * rsqe)
1985{
1986        u32 vpi, vci;
1987        vc_map *vc;
1988        struct sk_buff *iovb;
1989        struct iovec *iov;
1990        struct atm_vcc *vcc;
1991        struct sk_buff *skb;
1992        unsigned short aal5_len;
1993        int len;
1994        u32 stat;
1995        u32 id;
1996
1997        stat = readl(card->membase + STAT);
1998        card->sbfqc = ns_stat_sfbqc_get(stat);
1999        card->lbfqc = ns_stat_lfbqc_get(stat);
2000
2001        id = le32_to_cpu(rsqe->buffer_handle);
2002        skb = idr_find(&card->idr, id);
2003        if (!skb) {
2004                RXPRINTK(KERN_ERR
2005                         "nicstar%d: idr_find() failed!\n", card->index);
2006                return;
2007        }
2008        idr_remove(&card->idr, id);
2009        pci_dma_sync_single_for_cpu(card->pcidev,
2010                                    NS_PRV_DMA(skb),
2011                                    (NS_PRV_BUFTYPE(skb) == BUF_SM
2012                                     ? NS_SMSKBSIZE : NS_LGSKBSIZE),
2013                                    PCI_DMA_FROMDEVICE);
2014        pci_unmap_single(card->pcidev,
2015                         NS_PRV_DMA(skb),
2016                         (NS_PRV_BUFTYPE(skb) == BUF_SM
2017                          ? NS_SMSKBSIZE : NS_LGSKBSIZE),
2018                         PCI_DMA_FROMDEVICE);
2019        vpi = ns_rsqe_vpi(rsqe);
2020        vci = ns_rsqe_vci(rsqe);
2021        if (vpi >= 1UL << card->vpibits || vci >= 1UL << card->vcibits) {
2022                printk("nicstar%d: SDU received for out-of-range vc %d.%d.\n",
2023                       card->index, vpi, vci);
2024                recycle_rx_buf(card, skb);
2025                return;
2026        }
2027
2028        vc = &(card->vcmap[vpi << card->vcibits | vci]);
2029        if (!vc->rx) {
2030                RXPRINTK("nicstar%d: SDU received on non-rx vc %d.%d.\n",
2031                         card->index, vpi, vci);
2032                recycle_rx_buf(card, skb);
2033                return;
2034        }
2035
2036        vcc = vc->rx_vcc;
2037
2038        if (vcc->qos.aal == ATM_AAL0) {
2039                struct sk_buff *sb;
2040                unsigned char *cell;
2041                int i;
2042
2043                cell = skb->data;
2044                for (i = ns_rsqe_cellcount(rsqe); i; i--) {
2045                        if ((sb = dev_alloc_skb(NS_SMSKBSIZE)) == NULL) {
2046                                printk
2047                                    ("nicstar%d: Can't allocate buffers for aal0.\n",
2048                                     card->index);
2049                                atomic_add(i, &vcc->stats->rx_drop);
2050                                break;
2051                        }
2052                        if (!atm_charge(vcc, sb->truesize)) {
2053                                RXPRINTK
2054                                    ("nicstar%d: atm_charge() dropped aal0 packets.\n",
2055                                     card->index);
2056                                atomic_add(i - 1, &vcc->stats->rx_drop);        /* already increased by 1 */
2057                                dev_kfree_skb_any(sb);
2058                                break;
2059                        }
2060                        /* Rebuild the header */
2061                        *((u32 *) sb->data) = le32_to_cpu(rsqe->word_1) << 4 |
2062                            (ns_rsqe_clp(rsqe) ? 0x00000001 : 0x00000000);
2063                        if (i == 1 && ns_rsqe_eopdu(rsqe))
2064                                *((u32 *) sb->data) |= 0x00000002;
2065                        skb_put(sb, NS_AAL0_HEADER);
2066                        memcpy(skb_tail_pointer(sb), cell, ATM_CELL_PAYLOAD);
2067                        skb_put(sb, ATM_CELL_PAYLOAD);
2068                        ATM_SKB(sb)->vcc = vcc;
2069                        __net_timestamp(sb);
2070                        vcc->push(vcc, sb);
2071                        atomic_inc(&vcc->stats->rx);
2072                        cell += ATM_CELL_PAYLOAD;
2073                }
2074
2075                recycle_rx_buf(card, skb);
2076                return;
2077        }
2078
2079        /* To reach this point, the AAL layer can only be AAL5 */
2080
2081        if ((iovb = vc->rx_iov) == NULL) {
2082                iovb = skb_dequeue(&(card->iovpool.queue));
2083                if (iovb == NULL) {     /* No buffers in the queue */
2084                        iovb = alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC);
2085                        if (iovb == NULL) {
2086                                printk("nicstar%d: Out of iovec buffers.\n",
2087                                       card->index);
2088                                atomic_inc(&vcc->stats->rx_drop);
2089                                recycle_rx_buf(card, skb);
2090                                return;
2091                        }
2092                        NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2093                } else if (--card->iovpool.count < card->iovnr.min) {
2094                        struct sk_buff *new_iovb;
2095                        if ((new_iovb =
2096                             alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC)) != NULL) {
2097                                NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2098                                skb_queue_tail(&card->iovpool.queue, new_iovb);
2099                                card->iovpool.count++;
2100                        }
2101                }
2102                vc->rx_iov = iovb;
2103                NS_PRV_IOVCNT(iovb) = 0;
2104                iovb->len = 0;
2105                iovb->data = iovb->head;
2106                skb_reset_tail_pointer(iovb);
2107                /* IMPORTANT: a pointer to the sk_buff containing the small or large
2108                   buffer is stored as iovec base, NOT a pointer to the
2109                   small or large buffer itself. */
2110        } else if (NS_PRV_IOVCNT(iovb) >= NS_MAX_IOVECS) {
2111                printk("nicstar%d: received too big AAL5 SDU.\n", card->index);
2112                atomic_inc(&vcc->stats->rx_err);
2113                recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2114                                      NS_MAX_IOVECS);
2115                NS_PRV_IOVCNT(iovb) = 0;
2116                iovb->len = 0;
2117                iovb->data = iovb->head;
2118                skb_reset_tail_pointer(iovb);
2119        }
2120        iov = &((struct iovec *)iovb->data)[NS_PRV_IOVCNT(iovb)++];
2121        iov->iov_base = (void *)skb;
2122        iov->iov_len = ns_rsqe_cellcount(rsqe) * 48;
2123        iovb->len += iov->iov_len;
2124
2125#ifdef EXTRA_DEBUG
2126        if (NS_PRV_IOVCNT(iovb) == 1) {
2127                if (NS_PRV_BUFTYPE(skb) != BUF_SM) {
2128                        printk
2129                            ("nicstar%d: Expected a small buffer, and this is not one.\n",
2130                             card->index);
2131                        which_list(card, skb);
2132                        atomic_inc(&vcc->stats->rx_err);
2133                        recycle_rx_buf(card, skb);
2134                        vc->rx_iov = NULL;
2135                        recycle_iov_buf(card, iovb);
2136                        return;
2137                }
2138        } else {                /* NS_PRV_IOVCNT(iovb) >= 2 */
2139
2140                if (NS_PRV_BUFTYPE(skb) != BUF_LG) {
2141                        printk
2142                            ("nicstar%d: Expected a large buffer, and this is not one.\n",
2143                             card->index);
2144                        which_list(card, skb);
2145                        atomic_inc(&vcc->stats->rx_err);
2146                        recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2147                                              NS_PRV_IOVCNT(iovb));
2148                        vc->rx_iov = NULL;
2149                        recycle_iov_buf(card, iovb);
2150                        return;
2151                }
2152        }
2153#endif /* EXTRA_DEBUG */
2154
2155        if (ns_rsqe_eopdu(rsqe)) {
2156                /* This works correctly regardless of the endianness of the host */
2157                unsigned char *L1L2 = (unsigned char *)
2158                                                (skb->data + iov->iov_len - 6);
2159                aal5_len = L1L2[0] << 8 | L1L2[1];
2160                len = (aal5_len == 0x0000) ? 0x10000 : aal5_len;
2161                if (ns_rsqe_crcerr(rsqe) ||
2162                    len + 8 > iovb->len || len + (47 + 8) < iovb->len) {
2163                        printk("nicstar%d: AAL5 CRC error", card->index);
2164                        if (len + 8 > iovb->len || len + (47 + 8) < iovb->len)
2165                                printk(" - PDU size mismatch.\n");
2166                        else
2167                                printk(".\n");
2168                        atomic_inc(&vcc->stats->rx_err);
2169                        recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2170                                              NS_PRV_IOVCNT(iovb));
2171                        vc->rx_iov = NULL;
2172                        recycle_iov_buf(card, iovb);
2173                        return;
2174                }
2175
2176                /* By this point we (hopefully) have a complete SDU without errors. */
2177
2178                if (NS_PRV_IOVCNT(iovb) == 1) { /* Just a small buffer */
2179                        /* skb points to a small buffer */
2180                        if (!atm_charge(vcc, skb->truesize)) {
2181                                push_rxbufs(card, skb);
2182                                atomic_inc(&vcc->stats->rx_drop);
2183                        } else {
2184                                skb_put(skb, len);
2185                                dequeue_sm_buf(card, skb);
2186#ifdef NS_USE_DESTRUCTORS
2187                                skb->destructor = ns_sb_destructor;
2188#endif /* NS_USE_DESTRUCTORS */
2189                                ATM_SKB(skb)->vcc = vcc;
2190                                __net_timestamp(skb);
2191                                vcc->push(vcc, skb);
2192                                atomic_inc(&vcc->stats->rx);
2193                        }
2194                } else if (NS_PRV_IOVCNT(iovb) == 2) {  /* One small plus one large buffer */
2195                        struct sk_buff *sb;
2196
2197                        sb = (struct sk_buff *)(iov - 1)->iov_base;
2198                        /* skb points to a large buffer */
2199
2200                        if (len <= NS_SMBUFSIZE) {
2201                                if (!atm_charge(vcc, sb->truesize)) {
2202                                        push_rxbufs(card, sb);
2203                                        atomic_inc(&vcc->stats->rx_drop);
2204                                } else {
2205                                        skb_put(sb, len);
2206                                        dequeue_sm_buf(card, sb);
2207#ifdef NS_USE_DESTRUCTORS
2208                                        sb->destructor = ns_sb_destructor;
2209#endif /* NS_USE_DESTRUCTORS */
2210                                        ATM_SKB(sb)->vcc = vcc;
2211                                        __net_timestamp(sb);
2212                                        vcc->push(vcc, sb);
2213                                        atomic_inc(&vcc->stats->rx);
2214                                }
2215
2216                                push_rxbufs(card, skb);
2217
2218                        } else {        /* len > NS_SMBUFSIZE, the usual case */
2219
2220                                if (!atm_charge(vcc, skb->truesize)) {
2221                                        push_rxbufs(card, skb);
2222                                        atomic_inc(&vcc->stats->rx_drop);
2223                                } else {
2224                                        dequeue_lg_buf(card, skb);
2225#ifdef NS_USE_DESTRUCTORS
2226                                        skb->destructor = ns_lb_destructor;
2227#endif /* NS_USE_DESTRUCTORS */
2228                                        skb_push(skb, NS_SMBUFSIZE);
2229                                        skb_copy_from_linear_data(sb, skb->data,
2230                                                                  NS_SMBUFSIZE);
2231                                        skb_put(skb, len - NS_SMBUFSIZE);
2232                                        ATM_SKB(skb)->vcc = vcc;
2233                                        __net_timestamp(skb);
2234                                        vcc->push(vcc, skb);
2235                                        atomic_inc(&vcc->stats->rx);
2236                                }
2237
2238                                push_rxbufs(card, sb);
2239
2240                        }
2241
2242                } else {        /* Must push a huge buffer */
2243
2244                        struct sk_buff *hb, *sb, *lb;
2245                        int remaining, tocopy;
2246                        int j;
2247
2248                        hb = skb_dequeue(&(card->hbpool.queue));
2249                        if (hb == NULL) {       /* No buffers in the queue */
2250
2251                                hb = dev_alloc_skb(NS_HBUFSIZE);
2252                                if (hb == NULL) {
2253                                        printk
2254                                            ("nicstar%d: Out of huge buffers.\n",
2255                                             card->index);
2256                                        atomic_inc(&vcc->stats->rx_drop);
2257                                        recycle_iovec_rx_bufs(card,
2258                                                              (struct iovec *)
2259                                                              iovb->data,
2260                                                              NS_PRV_IOVCNT(iovb));
2261                                        vc->rx_iov = NULL;
2262                                        recycle_iov_buf(card, iovb);
2263                                        return;
2264                                } else if (card->hbpool.count < card->hbnr.min) {
2265                                        struct sk_buff *new_hb;
2266                                        if ((new_hb =
2267                                             dev_alloc_skb(NS_HBUFSIZE)) !=
2268                                            NULL) {
2269                                                skb_queue_tail(&card->hbpool.
2270                                                               queue, new_hb);
2271                                                card->hbpool.count++;
2272                                        }
2273                                }
2274                                NS_PRV_BUFTYPE(hb) = BUF_NONE;
2275                        } else if (--card->hbpool.count < card->hbnr.min) {
2276                                struct sk_buff *new_hb;
2277                                if ((new_hb =
2278                                     dev_alloc_skb(NS_HBUFSIZE)) != NULL) {
2279                                        NS_PRV_BUFTYPE(new_hb) = BUF_NONE;
2280                                        skb_queue_tail(&card->hbpool.queue,
2281                                                       new_hb);
2282                                        card->hbpool.count++;
2283                                }
2284                                if (card->hbpool.count < card->hbnr.min) {
2285                                        if ((new_hb =
2286                                             dev_alloc_skb(NS_HBUFSIZE)) !=
2287                                            NULL) {
2288                                                NS_PRV_BUFTYPE(new_hb) =
2289                                                    BUF_NONE;
2290                                                skb_queue_tail(&card->hbpool.
2291                                                               queue, new_hb);
2292                                                card->hbpool.count++;
2293                                        }
2294                                }
2295                        }
2296
2297                        iov = (struct iovec *)iovb->data;
2298
2299                        if (!atm_charge(vcc, hb->truesize)) {
2300                                recycle_iovec_rx_bufs(card, iov,
2301                                                      NS_PRV_IOVCNT(iovb));
2302                                if (card->hbpool.count < card->hbnr.max) {
2303                                        skb_queue_tail(&card->hbpool.queue, hb);
2304                                        card->hbpool.count++;
2305                                } else
2306                                        dev_kfree_skb_any(hb);
2307                                atomic_inc(&vcc->stats->rx_drop);
2308                        } else {
2309                                /* Copy the small buffer to the huge buffer */
2310                                sb = (struct sk_buff *)iov->iov_base;
2311                                skb_copy_from_linear_data(sb, hb->data,
2312                                                          iov->iov_len);
2313                                skb_put(hb, iov->iov_len);
2314                                remaining = len - iov->iov_len;
2315                                iov++;
2316                                /* Free the small buffer */
2317                                push_rxbufs(card, sb);
2318
2319                                /* Copy all large buffers to the huge buffer and free them */
2320                                for (j = 1; j < NS_PRV_IOVCNT(iovb); j++) {
2321                                        lb = (struct sk_buff *)iov->iov_base;
2322                                        tocopy =
2323                                            min_t(int, remaining, iov->iov_len);
2324                                        skb_copy_from_linear_data(lb,
2325                                                                  skb_tail_pointer
2326                                                                  (hb), tocopy);
2327                                        skb_put(hb, tocopy);
2328                                        iov++;
2329                                        remaining -= tocopy;
2330                                        push_rxbufs(card, lb);
2331                                }
2332#ifdef EXTRA_DEBUG
2333                                if (remaining != 0 || hb->len != len)
2334                                        printk
2335                                            ("nicstar%d: Huge buffer len mismatch.\n",
2336                                             card->index);
2337#endif /* EXTRA_DEBUG */
2338                                ATM_SKB(hb)->vcc = vcc;
2339#ifdef NS_USE_DESTRUCTORS
2340                                hb->destructor = ns_hb_destructor;
2341#endif /* NS_USE_DESTRUCTORS */
2342                                __net_timestamp(hb);
2343                                vcc->push(vcc, hb);
2344                                atomic_inc(&vcc->stats->rx);
2345                        }
2346                }
2347
2348                vc->rx_iov = NULL;
2349                recycle_iov_buf(card, iovb);
2350        }
2351
2352}
2353
2354#ifdef NS_USE_DESTRUCTORS
2355
2356static void ns_sb_destructor(struct sk_buff *sb)
2357{
2358        ns_dev *card;
2359        u32 stat;
2360
2361        card = (ns_dev *) ATM_SKB(sb)->vcc->dev->dev_data;
2362        stat = readl(card->membase + STAT);
2363        card->sbfqc = ns_stat_sfbqc_get(stat);
2364        card->lbfqc = ns_stat_lfbqc_get(stat);
2365
2366        do {
2367                sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
2368                if (sb == NULL)
2369                        break;
2370                NS_PRV_BUFTYPE(sb) = BUF_SM;
2371                skb_queue_tail(&card->sbpool.queue, sb);
2372                skb_reserve(sb, NS_AAL0_HEADER);
2373                push_rxbufs(card, sb);
2374        } while (card->sbfqc < card->sbnr.min);
2375}
2376
2377static void ns_lb_destructor(struct sk_buff *lb)
2378{
2379        ns_dev *card;
2380        u32 stat;
2381
2382        card = (ns_dev *) ATM_SKB(lb)->vcc->dev->dev_data;
2383        stat = readl(card->membase + STAT);
2384        card->sbfqc = ns_stat_sfbqc_get(stat);
2385        card->lbfqc = ns_stat_lfbqc_get(stat);
2386
2387        do {
2388                lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
2389                if (lb == NULL)
2390                        break;
2391                NS_PRV_BUFTYPE(lb) = BUF_LG;
2392                skb_queue_tail(&card->lbpool.queue, lb);
2393                skb_reserve(lb, NS_SMBUFSIZE);
2394                push_rxbufs(card, lb);
2395        } while (card->lbfqc < card->lbnr.min);
2396}
2397
2398static void ns_hb_destructor(struct sk_buff *hb)
2399{
2400        ns_dev *card;
2401
2402        card = (ns_dev *) ATM_SKB(hb)->vcc->dev->dev_data;
2403
2404        while (card->hbpool.count < card->hbnr.init) {
2405                hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
2406                if (hb == NULL)
2407                        break;
2408                NS_PRV_BUFTYPE(hb) = BUF_NONE;
2409                skb_queue_tail(&card->hbpool.queue, hb);
2410                card->hbpool.count++;
2411        }
2412}
2413
2414#endif /* NS_USE_DESTRUCTORS */
2415
2416static void recycle_rx_buf(ns_dev * card, struct sk_buff *skb)
2417{
2418        if (unlikely(NS_PRV_BUFTYPE(skb) == BUF_NONE)) {
2419                printk("nicstar%d: What kind of rx buffer is this?\n",
2420                       card->index);
2421                dev_kfree_skb_any(skb);
2422        } else
2423                push_rxbufs(card, skb);
2424}
2425
2426static void recycle_iovec_rx_bufs(ns_dev * card, struct iovec *iov, int count)
2427{
2428        while (count-- > 0)
2429                recycle_rx_buf(card, (struct sk_buff *)(iov++)->iov_base);
2430}
2431
2432static void recycle_iov_buf(ns_dev * card, struct sk_buff *iovb)
2433{
2434        if (card->iovpool.count < card->iovnr.max) {
2435                skb_queue_tail(&card->iovpool.queue, iovb);
2436                card->iovpool.count++;
2437        } else
2438                dev_kfree_skb_any(iovb);
2439}
2440
2441static void dequeue_sm_buf(ns_dev * card, struct sk_buff *sb)
2442{
2443        skb_unlink(sb, &card->sbpool.queue);
2444#ifdef NS_USE_DESTRUCTORS
2445        if (card->sbfqc < card->sbnr.min)
2446#else
2447        if (card->sbfqc < card->sbnr.init) {
2448                struct sk_buff *new_sb;
2449                if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL) {
2450                        NS_PRV_BUFTYPE(new_sb) = BUF_SM;
2451                        skb_queue_tail(&card->sbpool.queue, new_sb);
2452                        skb_reserve(new_sb, NS_AAL0_HEADER);
2453                        push_rxbufs(card, new_sb);
2454                }
2455        }
2456        if (card->sbfqc < card->sbnr.init)
2457#endif /* NS_USE_DESTRUCTORS */
2458        {
2459                struct sk_buff *new_sb;
2460                if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL) {
2461                        NS_PRV_BUFTYPE(new_sb) = BUF_SM;
2462                        skb_queue_tail(&card->sbpool.queue, new_sb);
2463                        skb_reserve(new_sb, NS_AAL0_HEADER);
2464                        push_rxbufs(card, new_sb);
2465                }
2466        }
2467}
2468
2469static void dequeue_lg_buf(ns_dev * card, struct sk_buff *lb)
2470{
2471        skb_unlink(lb, &card->lbpool.queue);
2472#ifdef NS_USE_DESTRUCTORS
2473        if (card->lbfqc < card->lbnr.min)
2474#else
2475        if (card->lbfqc < card->lbnr.init) {
2476                struct sk_buff *new_lb;
2477                if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL) {
2478                        NS_PRV_BUFTYPE(new_lb) = BUF_LG;
2479                        skb_queue_tail(&card->lbpool.queue, new_lb);
2480                        skb_reserve(new_lb, NS_SMBUFSIZE);
2481                        push_rxbufs(card, new_lb);
2482                }
2483        }
2484        if (card->lbfqc < card->lbnr.init)
2485#endif /* NS_USE_DESTRUCTORS */
2486        {
2487                struct sk_buff *new_lb;
2488                if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL) {
2489                        NS_PRV_BUFTYPE(new_lb) = BUF_LG;
2490                        skb_queue_tail(&card->lbpool.queue, new_lb);
2491                        skb_reserve(new_lb, NS_SMBUFSIZE);
2492                        push_rxbufs(card, new_lb);
2493                }
2494        }
2495}
2496
2497static int ns_proc_read(struct atm_dev *dev, loff_t * pos, char *page)
2498{
2499        u32 stat;
2500        ns_dev *card;
2501        int left;
2502
2503        left = (int)*pos;
2504        card = (ns_dev *) dev->dev_data;
2505        stat = readl(card->membase + STAT);
2506        if (!left--)
2507                return sprintf(page, "Pool   count    min   init    max \n");
2508        if (!left--)
2509                return sprintf(page, "Small  %5d  %5d  %5d  %5d \n",
2510                               ns_stat_sfbqc_get(stat), card->sbnr.min,
2511                               card->sbnr.init, card->sbnr.max);
2512        if (!left--)
2513                return sprintf(page, "Large  %5d  %5d  %5d  %5d \n",
2514                               ns_stat_lfbqc_get(stat), card->lbnr.min,
2515                               card->lbnr.init, card->lbnr.max);
2516        if (!left--)
2517                return sprintf(page, "Huge   %5d  %5d  %5d  %5d \n",
2518                               card->hbpool.count, card->hbnr.min,
2519                               card->hbnr.init, card->hbnr.max);
2520        if (!left--)
2521                return sprintf(page, "Iovec  %5d  %5d  %5d  %5d \n",
2522                               card->iovpool.count, card->iovnr.min,
2523                               card->iovnr.init, card->iovnr.max);
2524        if (!left--) {
2525                int retval;
2526                retval =
2527                    sprintf(page, "Interrupt counter: %u \n", card->intcnt);
2528                card->intcnt = 0;
2529                return retval;
2530        }
2531#if 0
2532        /* Dump 25.6 Mbps PHY registers */
2533        /* Now there's a 25.6 Mbps PHY driver this code isn't needed. I left it
2534           here just in case it's needed for debugging. */
2535        if (card->max_pcr == ATM_25_PCR && !left--) {
2536                u32 phy_regs[4];
2537                u32 i;
2538
2539                for (i = 0; i < 4; i++) {
2540                        while (CMD_BUSY(card)) ;
2541                        writel(NS_CMD_READ_UTILITY | 0x00000200 | i,
2542                               card->membase + CMD);
2543                        while (CMD_BUSY(card)) ;
2544                        phy_regs[i] = readl(card->membase + DR0) & 0x000000FF;
2545                }
2546
2547                return sprintf(page, "PHY regs: 0x%02X 0x%02X 0x%02X 0x%02X \n",
2548                               phy_regs[0], phy_regs[1], phy_regs[2],
2549                               phy_regs[3]);
2550        }
2551#endif /* 0 - Dump 25.6 Mbps PHY registers */
2552#if 0
2553        /* Dump TST */
2554        if (left-- < NS_TST_NUM_ENTRIES) {
2555                if (card->tste2vc[left + 1] == NULL)
2556                        return sprintf(page, "%5d - VBR/UBR \n", left + 1);
2557                else
2558                        return sprintf(page, "%5d - %d %d \n", left + 1,
2559                                       card->tste2vc[left + 1]->tx_vcc->vpi,
2560                                       card->tste2vc[left + 1]->tx_vcc->vci);
2561        }
2562#endif /* 0 */
2563        return 0;
2564}
2565
2566static int ns_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg)
2567{
2568        ns_dev *card;
2569        pool_levels pl;
2570        long btype;
2571        unsigned long flags;
2572
2573        card = dev->dev_data;
2574        switch (cmd) {
2575        case NS_GETPSTAT:
2576                if (get_user
2577                    (pl.buftype, &((pool_levels __user *) arg)->buftype))
2578                        return -EFAULT;
2579                switch (pl.buftype) {
2580                case NS_BUFTYPE_SMALL:
2581                        pl.count =
2582                            ns_stat_sfbqc_get(readl(card->membase + STAT));
2583                        pl.level.min = card->sbnr.min;
2584                        pl.level.init = card->sbnr.init;
2585                        pl.level.max = card->sbnr.max;
2586                        break;
2587
2588                case NS_BUFTYPE_LARGE:
2589                        pl.count =
2590                            ns_stat_lfbqc_get(readl(card->membase + STAT));
2591                        pl.level.min = card->lbnr.min;
2592                        pl.level.init = card->lbnr.init;
2593                        pl.level.max = card->lbnr.max;
2594                        break;
2595
2596                case NS_BUFTYPE_HUGE:
2597                        pl.count = card->hbpool.count;
2598                        pl.level.min = card->hbnr.min;
2599                        pl.level.init = card->hbnr.init;
2600                        pl.level.max = card->hbnr.max;
2601                        break;
2602
2603                case NS_BUFTYPE_IOVEC:
2604                        pl.count = card->iovpool.count;
2605                        pl.level.min = card->iovnr.min;
2606                        pl.level.init = card->iovnr.init;
2607                        pl.level.max = card->iovnr.max;
2608                        break;
2609
2610                default:
2611                        return -ENOIOCTLCMD;
2612
2613                }
2614                if (!copy_to_user((pool_levels __user *) arg, &pl, sizeof(pl)))
2615                        return (sizeof(pl));
2616                else
2617                        return -EFAULT;
2618
2619        case NS_SETBUFLEV:
2620                if (!capable(CAP_NET_ADMIN))
2621                        return -EPERM;
2622                if (copy_from_user(&pl, (pool_levels __user *) arg, sizeof(pl)))
2623                        return -EFAULT;
2624                if (pl.level.min >= pl.level.init
2625                    || pl.level.init >= pl.level.max)
2626                        return -EINVAL;
2627                if (pl.level.min == 0)
2628                        return -EINVAL;
2629                switch (pl.buftype) {
2630                case NS_BUFTYPE_SMALL:
2631                        if (pl.level.max > TOP_SB)
2632                                return -EINVAL;
2633                        card->sbnr.min = pl.level.min;
2634                        card->sbnr.init = pl.level.init;
2635                        card->sbnr.max = pl.level.max;
2636                        break;
2637
2638                case NS_BUFTYPE_LARGE:
2639                        if (pl.level.max > TOP_LB)
2640                                return -EINVAL;
2641                        card->lbnr.min = pl.level.min;
2642                        card->lbnr.init = pl.level.init;
2643                        card->lbnr.max = pl.level.max;
2644                        break;
2645
2646                case NS_BUFTYPE_HUGE:
2647                        if (pl.level.max > TOP_HB)
2648                                return -EINVAL;
2649                        card->hbnr.min = pl.level.min;
2650                        card->hbnr.init = pl.level.init;
2651                        card->hbnr.max = pl.level.max;
2652                        break;
2653
2654                case NS_BUFTYPE_IOVEC:
2655                        if (pl.level.max > TOP_IOVB)
2656                                return -EINVAL;
2657                        card->iovnr.min = pl.level.min;
2658                        card->iovnr.init = pl.level.init;
2659                        card->iovnr.max = pl.level.max;
2660                        break;
2661
2662                default:
2663                        return -EINVAL;
2664
2665                }
2666                return 0;
2667
2668        case NS_ADJBUFLEV:
2669                if (!capable(CAP_NET_ADMIN))
2670                        return -EPERM;
2671                btype = (long)arg;      /* a long is the same size as a pointer or bigger */
2672                switch (btype) {
2673                case NS_BUFTYPE_SMALL:
2674                        while (card->sbfqc < card->sbnr.init) {
2675                                struct sk_buff *sb;
2676
2677                                sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
2678                                if (sb == NULL)
2679                                        return -ENOMEM;
2680                                NS_PRV_BUFTYPE(sb) = BUF_SM;
2681                                skb_queue_tail(&card->sbpool.queue, sb);
2682                                skb_reserve(sb, NS_AAL0_HEADER);
2683                                push_rxbufs(card, sb);
2684                        }
2685                        break;
2686
2687                case NS_BUFTYPE_LARGE:
2688                        while (card->lbfqc < card->lbnr.init) {
2689                                struct sk_buff *lb;
2690
2691                                lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
2692                                if (lb == NULL)
2693                                        return -ENOMEM;
2694                                NS_PRV_BUFTYPE(lb) = BUF_LG;
2695                                skb_queue_tail(&card->lbpool.queue, lb);
2696                                skb_reserve(lb, NS_SMBUFSIZE);
2697                                push_rxbufs(card, lb);
2698                        }
2699                        break;
2700
2701                case NS_BUFTYPE_HUGE:
2702                        while (card->hbpool.count > card->hbnr.init) {
2703                                struct sk_buff *hb;
2704
2705                                spin_lock_irqsave(&card->int_lock, flags);
2706                                hb = skb_dequeue(&card->hbpool.queue);
2707                                card->hbpool.count--;
2708                                spin_unlock_irqrestore(&card->int_lock, flags);
2709                                if (hb == NULL)
2710                                        printk
2711                                            ("nicstar%d: huge buffer count inconsistent.\n",
2712                                             card->index);
2713                                else
2714                                        dev_kfree_skb_any(hb);
2715
2716                        }
2717                        while (card->hbpool.count < card->hbnr.init) {
2718                                struct sk_buff *hb;
2719
2720                                hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
2721                                if (hb == NULL)
2722                                        return -ENOMEM;
2723                                NS_PRV_BUFTYPE(hb) = BUF_NONE;
2724                                spin_lock_irqsave(&card->int_lock, flags);
2725                                skb_queue_tail(&card->hbpool.queue, hb);
2726                                card->hbpool.count++;
2727                                spin_unlock_irqrestore(&card->int_lock, flags);
2728                        }
2729                        break;
2730
2731                case NS_BUFTYPE_IOVEC:
2732                        while (card->iovpool.count > card->iovnr.init) {
2733                                struct sk_buff *iovb;
2734
2735                                spin_lock_irqsave(&card->int_lock, flags);
2736                                iovb = skb_dequeue(&card->iovpool.queue);
2737                                card->iovpool.count--;
2738                                spin_unlock_irqrestore(&card->int_lock, flags);
2739                                if (iovb == NULL)
2740                                        printk
2741                                            ("nicstar%d: iovec buffer count inconsistent.\n",
2742                                             card->index);
2743                                else
2744                                        dev_kfree_skb_any(iovb);
2745
2746                        }
2747                        while (card->iovpool.count < card->iovnr.init) {
2748                                struct sk_buff *iovb;
2749
2750                                iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
2751                                if (iovb == NULL)
2752                                        return -ENOMEM;
2753                                NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2754                                spin_lock_irqsave(&card->int_lock, flags);
2755                                skb_queue_tail(&card->iovpool.queue, iovb);
2756                                card->iovpool.count++;
2757                                spin_unlock_irqrestore(&card->int_lock, flags);
2758                        }
2759                        break;
2760
2761                default:
2762                        return -EINVAL;
2763
2764                }
2765                return 0;
2766
2767        default:
2768                if (dev->phy && dev->phy->ioctl) {
2769                        return dev->phy->ioctl(dev, cmd, arg);
2770                } else {
2771                        printk("nicstar%d: %s == NULL \n", card->index,
2772                               dev->phy ? "dev->phy->ioctl" : "dev->phy");
2773                        return -ENOIOCTLCMD;
2774                }
2775        }
2776}
2777
2778#ifdef EXTRA_DEBUG
2779static void which_list(ns_dev * card, struct sk_buff *skb)
2780{
2781        printk("skb buf_type: 0x%08x\n", NS_PRV_BUFTYPE(skb));
2782}
2783#endif /* EXTRA_DEBUG */
2784
2785static void ns_poll(unsigned long arg)
2786{
2787        int i;
2788        ns_dev *card;
2789        unsigned long flags;
2790        u32 stat_r, stat_w;
2791
2792        PRINTK("nicstar: Entering ns_poll().\n");
2793        for (i = 0; i < num_cards; i++) {
2794                card = cards[i];
2795                if (spin_is_locked(&card->int_lock)) {
2796                        /* Probably it isn't worth spinning */
2797                        continue;
2798                }
2799                spin_lock_irqsave(&card->int_lock, flags);
2800
2801                stat_w = 0;
2802                stat_r = readl(card->membase + STAT);
2803                if (stat_r & NS_STAT_TSIF)
2804                        stat_w |= NS_STAT_TSIF;
2805                if (stat_r & NS_STAT_EOPDU)
2806                        stat_w |= NS_STAT_EOPDU;
2807
2808                process_tsq(card);
2809                process_rsq(card);
2810
2811                writel(stat_w, card->membase + STAT);
2812                spin_unlock_irqrestore(&card->int_lock, flags);
2813        }
2814        mod_timer(&ns_timer, jiffies + NS_POLL_PERIOD);
2815        PRINTK("nicstar: Leaving ns_poll().\n");
2816}
2817
2818static int ns_parse_mac(char *mac, unsigned char *esi)
2819{
2820        int i, j;
2821        short byte1, byte0;
2822
2823        if (mac == NULL || esi == NULL)
2824                return -1;
2825        j = 0;
2826        for (i = 0; i < 6; i++) {
2827                if ((byte1 = hex_to_bin(mac[j++])) < 0)
2828                        return -1;
2829                if ((byte0 = hex_to_bin(mac[j++])) < 0)
2830                        return -1;
2831                esi[i] = (unsigned char)(byte1 * 16 + byte0);
2832                if (i < 5) {
2833                        if (mac[j++] != ':')
2834                                return -1;
2835                }
2836        }
2837        return 0;
2838}
2839
2840
2841static void ns_phy_put(struct atm_dev *dev, unsigned char value,
2842                       unsigned long addr)
2843{
2844        ns_dev *card;
2845        unsigned long flags;
2846
2847        card = dev->dev_data;
2848        spin_lock_irqsave(&card->res_lock, flags);
2849        while (CMD_BUSY(card)) ;
2850        writel((u32) value, card->membase + DR0);
2851        writel(NS_CMD_WRITE_UTILITY | 0x00000200 | (addr & 0x000000FF),
2852               card->membase + CMD);
2853        spin_unlock_irqrestore(&card->res_lock, flags);
2854}
2855
2856static unsigned char ns_phy_get(struct atm_dev *dev, unsigned long addr)
2857{
2858        ns_dev *card;
2859        unsigned long flags;
2860        u32 data;
2861
2862        card = dev->dev_data;
2863        spin_lock_irqsave(&card->res_lock, flags);
2864        while (CMD_BUSY(card)) ;
2865        writel(NS_CMD_READ_UTILITY | 0x00000200 | (addr & 0x000000FF),
2866               card->membase + CMD);
2867        while (CMD_BUSY(card)) ;
2868        data = readl(card->membase + DR0) & 0x000000FF;
2869        spin_unlock_irqrestore(&card->res_lock, flags);
2870        return (unsigned char)data;
2871}
2872
2873module_init(nicstar_init);
2874module_exit(nicstar_cleanup);
2875
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