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