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