drivers/atm/nicstar.c

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