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