drivers/atm/nicstar.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * nicstar.c
   4  *
   5  * Device driver supporting CBR for IDT 77201/77211 "NICStAR" based cards.
   6  *
   7  * IMPORTANT: The included file nicstarmac.c was NOT WRITTEN BY ME.
   8  *            It was taken from the frle-0.22 device driver.
   9  *            As the file doesn't have a copyright notice, in the file
  10  *            nicstarmac.copyright I put the copyright notice from the
  11  *            frle-0.22 device driver.
  12  *            Some code is based on the nicstar driver by M. Welsh.
  13  *
  14  * Author: Rui Prior (rprior@inescn.pt)
  15  * PowerPC support by Jay Talbott (jay_talbott@mcg.mot.com) April 1999
  16  *
  17  *
  18  * (C) INESC 1999
  19  */
  20
  21 /*
  22  * IMPORTANT INFORMATION
  23  *
  24  * There are currently three types of spinlocks:
  25  *
  26  * 1 - Per card interrupt spinlock (to protect structures and such)
  27  * 2 - Per SCQ scq spinlock
  28  * 3 - Per card resource spinlock (to access registers, etc.)
  29  *
  30  * These must NEVER be grabbed in reverse order.
  31  *
  32  */
  33
  34 /* Header files */
  35
  36 #include <linux/module.h>
  37 #include <linux/kernel.h>
  38 #include <linux/skbuff.h>
  39 #include <linux/atmdev.h>
  40 #include <linux/atm.h>
  41 #include <linux/pci.h>
  42 #include <linux/dma-mapping.h>
  43 #include <linux/types.h>
  44 #include <linux/string.h>
  45 #include <linux/delay.h>
  46 #include <linux/init.h>
  47 #include <linux/sched.h>
  48 #include <linux/timer.h>
  49 #include <linux/interrupt.h>
  50 #include <linux/bitops.h>
  51 #include <linux/slab.h>
  52 #include <linux/idr.h>
  53 #include <asm/io.h>
  54 #include <linux/uaccess.h>
  55 #include <linux/atomic.h>
  56 #include <linux/etherdevice.h>
  57 #include "nicstar.h"
  58 #ifdef CONFIG_ATM_NICSTAR_USE_SUNI
  59 #include "suni.h"
  60 #endif /* CONFIG_ATM_NICSTAR_USE_SUNI */
  61 #ifdef CONFIG_ATM_NICSTAR_USE_IDT77105
  62 #include "idt77105.h"
  63 #endif /* CONFIG_ATM_NICSTAR_USE_IDT77105 */
  64
  65 /* Additional code */
  66
  67 #include "nicstarmac.c"
  68
  69 /* Configurable parameters */
  70
  71 #undef PHY_LOOPBACK
  72 #undef TX_DEBUG
  73 #undef RX_DEBUG
  74 #undef GENERAL_DEBUG
  75 #undef EXTRA_DEBUG
  76
  77 /* Do not touch these */
  78
  79 #ifdef TX_DEBUG
  80 #define TXPRINTK(args...) printk(args)
  81 #else
  82 #define TXPRINTK(args...)
  83 #endif /* TX_DEBUG */
  84
  85 #ifdef RX_DEBUG
  86 #define RXPRINTK(args...) printk(args)
  87 #else
  88 #define RXPRINTK(args...)
  89 #endif /* RX_DEBUG */
  90
  91 #ifdef GENERAL_DEBUG
  92 #define PRINTK(args...) printk(args)
  93 #else
  94 #define PRINTK(args...) do {} while (0)
  95 #endif /* GENERAL_DEBUG */
  96
  97 #ifdef EXTRA_DEBUG
  98 #define XPRINTK(args...) printk(args)
  99 #else
 100 #define XPRINTK(args...)
 101 #endif /* EXTRA_DEBUG */
 102
 103 /* Macros */
 104
 105 #define CMD_BUSY(card) (readl((card)->membase + STAT) & NS_STAT_CMDBZ)
 106
 107 #define NS_DELAY mdelay(1)
 108
 109 #define PTR_DIFF(a, b)  ((u32)((unsigned long)(a) - (unsigned long)(b)))
 110
 111 #ifndef ATM_SKB
 112 #define ATM_SKB(s) (&(s)->atm)
 113 #endif
 114
 115 #define scq_virt_to_bus(scq, p) \
 116                 (scq->dma + ((unsigned long)(p) - (unsigned long)(scq)->org))
 117
 118 /* Function declarations */
 119
 120 static u32 ns_read_sram(ns_dev * card, u32 sram_address);
 121 static void ns_write_sram(ns_dev * card, u32 sram_address, u32 * value,
 122                           int count);
 123 static int ns_init_card(int i, struct pci_dev *pcidev);
 124 static void ns_init_card_error(ns_dev * card, int error);
 125 static scq_info *get_scq(ns_dev *card, int size, u32 scd);
 126 static void free_scq(ns_dev *card, scq_info * scq, struct atm_vcc *vcc);
 127 static void push_rxbufs(ns_dev *, struct sk_buff *);
 128 static irqreturn_t ns_irq_handler(int irq, void *dev_id);
 129 static int ns_open(struct atm_vcc *vcc);
 130 static void ns_close(struct atm_vcc *vcc);
 131 static void fill_tst(ns_dev * card, int n, vc_map * vc);
 132 static int ns_send(struct atm_vcc *vcc, struct sk_buff *skb);
 133 static int push_scqe(ns_dev * card, vc_map * vc, scq_info * scq, ns_scqe * tbd,
 134                      struct sk_buff *skb);
 135 static void process_tsq(ns_dev * card);
 136 static void drain_scq(ns_dev * card, scq_info * scq, int pos);
 137 static void process_rsq(ns_dev * card);
 138 static void dequeue_rx(ns_dev * card, ns_rsqe * rsqe);
 139 static void recycle_rx_buf(ns_dev * card, struct sk_buff *skb);
 140 static void recycle_iovec_rx_bufs(ns_dev * card, struct iovec *iov, int count);
 141 static void recycle_iov_buf(ns_dev * card, struct sk_buff *iovb);
 142 static void dequeue_sm_buf(ns_dev * card, struct sk_buff *sb);
 143 static void dequeue_lg_buf(ns_dev * card, struct sk_buff *lb);
 144 static int ns_proc_read(struct atm_dev *dev, loff_t * pos, char *page);
 145 static int ns_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg);
 146 #ifdef EXTRA_DEBUG
 147 static void which_list(ns_dev * card, struct sk_buff *skb);
 148 #endif
 149 static void ns_poll(struct timer_list *unused);
 150 static void ns_phy_put(struct atm_dev *dev, unsigned char value,
 151                        unsigned long addr);
 152 static unsigned char ns_phy_get(struct atm_dev *dev, unsigned long addr);
 153
 154 /* Global variables */
 155
 156 static struct ns_dev *cards[NS_MAX_CARDS];
 157 static unsigned num_cards;
 158 static const struct atmdev_ops atm_ops = {
 159         .open = ns_open,
 160         .close = ns_close,
 161         .ioctl = ns_ioctl,
 162         .send = ns_send,
 163         .phy_put = ns_phy_put,
 164         .phy_get = ns_phy_get,
 165         .proc_read = ns_proc_read,
 166         .owner = THIS_MODULE,
 167 };
 168
 169 static struct timer_list ns_timer;
 170 static char *mac[NS_MAX_CARDS];
 171 module_param_array(mac, charp, NULL, 0);
 172 MODULE_LICENSE("GPL");
 173
 174 /* Functions */
 175
 176 static int nicstar_init_one(struct pci_dev *pcidev,
 177                             const struct pci_device_id *ent)
 178 {
 179         static int index = -1;
 180         unsigned int error;
 181
 182         index++;
 183         cards[index] = NULL;
 184
 185         error = ns_init_card(index, pcidev);
 186         if (error) {
 187                 cards[index--] = NULL;  /* don't increment index */
 188                 goto err_out;
 189         }
 190
 191         return 0;
 192 err_out:
 193         return -ENODEV;
 194 }
 195
 196 static void nicstar_remove_one(struct pci_dev *pcidev)
 197 {
 198         int i, j;
 199         ns_dev *card = pci_get_drvdata(pcidev);
 200         struct sk_buff *hb;
 201         struct sk_buff *iovb;
 202         struct sk_buff *lb;
 203         struct sk_buff *sb;
 204
 205         i = card->index;
 206
 207         if (cards[i] == NULL)
 208                 return;
 209
 210         if (card->atmdev->phy && card->atmdev->phy->stop)
 211                 card->atmdev->phy->stop(card->atmdev);
 212
 213         /* Stop everything */
 214         writel(0x00000000, card->membase + CFG);
 215
 216         /* De-register device */
 217         atm_dev_deregister(card->atmdev);
 218
 219         /* Disable PCI device */
 220         pci_disable_device(pcidev);
 221
 222         /* Free up resources */
 223         j = 0;
 224         PRINTK("nicstar%d: freeing %d huge buffers.\n", i, card->hbpool.count);
 225         while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL) {
 226                 dev_kfree_skb_any(hb);
 227                 j++;
 228         }
 229         PRINTK("nicstar%d: %d huge buffers freed.\n", i, j);
 230         j = 0;
 231         PRINTK("nicstar%d: freeing %d iovec buffers.\n", i,
 232                card->iovpool.count);
 233         while ((iovb = skb_dequeue(&card->iovpool.queue)) != NULL) {
 234                 dev_kfree_skb_any(iovb);
 235                 j++;
 236         }
 237         PRINTK("nicstar%d: %d iovec buffers freed.\n", i, j);
 238         while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
 239                 dev_kfree_skb_any(lb);
 240         while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
 241                 dev_kfree_skb_any(sb);
 242         free_scq(card, card->scq0, NULL);
 243         for (j = 0; j < NS_FRSCD_NUM; j++) {
 244                 if (card->scd2vc[j] != NULL)
 245                         free_scq(card, card->scd2vc[j]->scq, card->scd2vc[j]->tx_vcc);
 246         }
 247         idr_destroy(&card->idr);
 248         dma_free_coherent(&card->pcidev->dev, NS_RSQSIZE + NS_RSQ_ALIGNMENT,
 249                           card->rsq.org, card->rsq.dma);
 250         dma_free_coherent(&card->pcidev->dev, NS_TSQSIZE + NS_TSQ_ALIGNMENT,
 251                           card->tsq.org, card->tsq.dma);
 252         free_irq(card->pcidev->irq, card);
 253         iounmap(card->membase);
 254         kfree(card);
 255 }
 256
 257 static const struct pci_device_id nicstar_pci_tbl[] = {
 258         { PCI_VDEVICE(IDT, PCI_DEVICE_ID_IDT_IDT77201), 0 },
 259         {0,}                    /* terminate list */
 260 };
 261
 262 MODULE_DEVICE_TABLE(pci, nicstar_pci_tbl);
 263
 264 static struct pci_driver nicstar_driver = {
 265         .name = "nicstar",
 266         .id_table = nicstar_pci_tbl,
 267         .probe = nicstar_init_one,
 268         .remove = nicstar_remove_one,
 269 };
 270
 271 static int __init nicstar_init(void)
 272 {
 273         unsigned error = 0;     /* Initialized to remove compile warning */
 274
 275         XPRINTK("nicstar: nicstar_init() called.\n");
 276
 277         error = pci_register_driver(&nicstar_driver);
 278
 279         TXPRINTK("nicstar: TX debug enabled.\n");
 280         RXPRINTK("nicstar: RX debug enabled.\n");
 281         PRINTK("nicstar: General debug enabled.\n");
 282 #ifdef PHY_LOOPBACK
 283         printk("nicstar: using PHY loopback.\n");
 284 #endif /* PHY_LOOPBACK */
 285         XPRINTK("nicstar: nicstar_init() returned.\n");
 286
 287         if (!error) {
 288                 timer_setup(&ns_timer, ns_poll, 0);
 289                 ns_timer.expires = jiffies + NS_POLL_PERIOD;
 290                 add_timer(&ns_timer);
 291         }
 292
 293         return error;
 294 }
 295
 296 static void __exit nicstar_cleanup(void)
 297 {
 298         XPRINTK("nicstar: nicstar_cleanup() called.\n");
 299
 300         del_timer_sync(&ns_timer);
 301
 302         pci_unregister_driver(&nicstar_driver);
 303
 304         XPRINTK("nicstar: nicstar_cleanup() returned.\n");
 305 }
 306
 307 static u32 ns_read_sram(ns_dev * card, u32 sram_address)
 308 {
 309         unsigned long flags;
 310         u32 data;
 311         sram_address <<= 2;
 312         sram_address &= 0x0007FFFC;     /* address must be dword aligned */
 313         sram_address |= 0x50000000;     /* SRAM read command */
 314         spin_lock_irqsave(&card->res_lock, flags);
 315         while (CMD_BUSY(card)) ;
 316         writel(sram_address, card->membase + CMD);
 317         while (CMD_BUSY(card)) ;
 318         data = readl(card->membase + DR0);
 319         spin_unlock_irqrestore(&card->res_lock, flags);
 320         return data;
 321 }
 322
 323 static void ns_write_sram(ns_dev * card, u32 sram_address, u32 * value,
 324                           int count)
 325 {
 326         unsigned long flags;
 327         int i, c;
 328         count--;                /* count range now is 0..3 instead of 1..4 */
 329         c = count;
 330         c <<= 2;                /* to use increments of 4 */
 331         spin_lock_irqsave(&card->res_lock, flags);
 332         while (CMD_BUSY(card)) ;
 333         for (i = 0; i <= c; i += 4)
 334                 writel(*(value++), card->membase + i);
 335         /* Note: DR# registers are the first 4 dwords in nicstar's memspace,
 336            so card->membase + DR0 == card->membase */
 337         sram_address <<= 2;
 338         sram_address &= 0x0007FFFC;
 339         sram_address |= (0x40000000 | count);
 340         writel(sram_address, card->membase + CMD);
 341         spin_unlock_irqrestore(&card->res_lock, flags);
 342 }
 343
 344 static int ns_init_card(int i, struct pci_dev *pcidev)
 345 {
 346         int j;
 347         struct ns_dev *card = NULL;
 348         unsigned char pci_latency;
 349         unsigned error;
 350         u32 data;
 351         u32 u32d[4];
 352         u32 ns_cfg_rctsize;
 353         int bcount;
 354         unsigned long membase;
 355
 356         error = 0;
 357
 358         if (pci_enable_device(pcidev)) {
 359                 printk("nicstar%d: can't enable PCI device\n", i);
 360                 error = 2;
 361                 ns_init_card_error(card, error);
 362                 return error;
 363         }
 364         if (dma_set_mask_and_coherent(&pcidev->dev, DMA_BIT_MASK(32)) != 0) {
 365                 printk(KERN_WARNING
 366                        "nicstar%d: No suitable DMA available.\n", i);
 367                 error = 2;
 368                 ns_init_card_error(card, error);
 369                 return error;
 370         }
 371
 372         card = kmalloc(sizeof(*card), GFP_KERNEL);
 373         if (!card) {
 374                 printk
 375                     ("nicstar%d: can't allocate memory for device structure.\n",
 376                      i);
 377                 error = 2;
 378                 ns_init_card_error(card, error);
 379                 return error;
 380         }
 381         cards[i] = card;
 382         spin_lock_init(&card->int_lock);
 383         spin_lock_init(&card->res_lock);
 384
 385         pci_set_drvdata(pcidev, card);
 386
 387         card->index = i;
 388         card->atmdev = NULL;
 389         card->pcidev = pcidev;
 390         membase = pci_resource_start(pcidev, 1);
 391         card->membase = ioremap(membase, NS_IOREMAP_SIZE);
 392         if (!card->membase) {
 393                 printk("nicstar%d: can't ioremap() membase.\n", i);
 394                 error = 3;
 395                 ns_init_card_error(card, error);
 396                 return error;
 397         }
 398         PRINTK("nicstar%d: membase at 0x%p.\n", i, card->membase);
 399
 400         pci_set_master(pcidev);
 401
 402         if (pci_read_config_byte(pcidev, PCI_LATENCY_TIMER, &pci_latency) != 0) {
 403                 printk("nicstar%d: can't read PCI latency timer.\n", i);
 404                 error = 6;
 405                 ns_init_card_error(card, error);
 406                 return error;
 407         }
 408 #ifdef NS_PCI_LATENCY
 409         if (pci_latency < NS_PCI_LATENCY) {
 410                 PRINTK("nicstar%d: setting PCI latency timer to %d.\n", i,
 411                        NS_PCI_LATENCY);
 412                 for (j = 1; j < 4; j++) {
 413                         if (pci_write_config_byte
 414                             (pcidev, PCI_LATENCY_TIMER, NS_PCI_LATENCY) != 0)
 415                                 break;
 416                 }
 417                 if (j == 4) {
 418                         printk
 419                             ("nicstar%d: can't set PCI latency timer to %d.\n",
 420                              i, NS_PCI_LATENCY);
 421                         error = 7;
 422                         ns_init_card_error(card, error);
 423                         return error;
 424                 }
 425         }
 426 #endif /* NS_PCI_LATENCY */
 427
 428         /* Clear timer overflow */
 429         data = readl(card->membase + STAT);
 430         if (data & NS_STAT_TMROF)
 431                 writel(NS_STAT_TMROF, card->membase + STAT);
 432
 433         /* Software reset */
 434         writel(NS_CFG_SWRST, card->membase + CFG);
 435         NS_DELAY;
 436         writel(0x00000000, card->membase + CFG);
 437
 438         /* PHY reset */
 439         writel(0x00000008, card->membase + GP);
 440         NS_DELAY;
 441         writel(0x00000001, card->membase + GP);
 442         NS_DELAY;
 443         while (CMD_BUSY(card)) ;
 444         writel(NS_CMD_WRITE_UTILITY | 0x00000100, card->membase + CMD); /* Sync UTOPIA with SAR clock */
 445         NS_DELAY;
 446
 447         /* Detect PHY type */
 448         while (CMD_BUSY(card)) ;
 449         writel(NS_CMD_READ_UTILITY | 0x00000200, card->membase + CMD);
 450         while (CMD_BUSY(card)) ;
 451         data = readl(card->membase + DR0);
 452         switch (data) {
 453         case 0x00000009:
 454                 printk("nicstar%d: PHY seems to be 25 Mbps.\n", i);
 455                 card->max_pcr = ATM_25_PCR;
 456                 while (CMD_BUSY(card)) ;
 457                 writel(0x00000008, card->membase + DR0);
 458                 writel(NS_CMD_WRITE_UTILITY | 0x00000200, card->membase + CMD);
 459                 /* Clear an eventual pending interrupt */
 460                 writel(NS_STAT_SFBQF, card->membase + STAT);
 461 #ifdef PHY_LOOPBACK
 462                 while (CMD_BUSY(card)) ;
 463                 writel(0x00000022, card->membase + DR0);
 464                 writel(NS_CMD_WRITE_UTILITY | 0x00000202, card->membase + CMD);
 465 #endif /* PHY_LOOPBACK */
 466                 break;
 467         case 0x00000030:
 468         case 0x00000031:
 469                 printk("nicstar%d: PHY seems to be 155 Mbps.\n", i);
 470                 card->max_pcr = ATM_OC3_PCR;
 471 #ifdef PHY_LOOPBACK
 472                 while (CMD_BUSY(card)) ;
 473                 writel(0x00000002, card->membase + DR0);
 474                 writel(NS_CMD_WRITE_UTILITY | 0x00000205, card->membase + CMD);
 475 #endif /* PHY_LOOPBACK */
 476                 break;
 477         default:
 478                 printk("nicstar%d: unknown PHY type (0x%08X).\n", i, data);
 479                 error = 8;
 480                 ns_init_card_error(card, error);
 481                 return error;
 482         }
 483         writel(0x00000000, card->membase + GP);
 484
 485         /* Determine SRAM size */
 486         data = 0x76543210;
 487         ns_write_sram(card, 0x1C003, &data, 1);
 488         data = 0x89ABCDEF;
 489         ns_write_sram(card, 0x14003, &data, 1);
 490         if (ns_read_sram(card, 0x14003) == 0x89ABCDEF &&
 491             ns_read_sram(card, 0x1C003) == 0x76543210)
 492                 card->sram_size = 128;
 493         else
 494                 card->sram_size = 32;
 495         PRINTK("nicstar%d: %dK x 32bit SRAM size.\n", i, card->sram_size);
 496
 497         card->rct_size = NS_MAX_RCTSIZE;
 498
 499 #if (NS_MAX_RCTSIZE == 4096)
 500         if (card->sram_size == 128)
 501                 printk
 502                     ("nicstar%d: limiting maximum VCI. See NS_MAX_RCTSIZE in nicstar.h\n",
 503                      i);
 504 #elif (NS_MAX_RCTSIZE == 16384)
 505         if (card->sram_size == 32) {
 506                 printk
 507                     ("nicstar%d: wasting memory. See NS_MAX_RCTSIZE in nicstar.h\n",
 508                      i);
 509                 card->rct_size = 4096;
 510         }
 511 #else
 512 #error NS_MAX_RCTSIZE must be either 4096 or 16384 in nicstar.c
 513 #endif
 514
 515         card->vpibits = NS_VPIBITS;
 516         if (card->rct_size == 4096)
 517                 card->vcibits = 12 - NS_VPIBITS;
 518         else                    /* card->rct_size == 16384 */
 519                 card->vcibits = 14 - NS_VPIBITS;
 520
 521         /* Initialize the nicstar eeprom/eprom stuff, for the MAC addr */
 522         if (mac[i] == NULL)
 523                 nicstar_init_eprom(card->membase);
 524
 525         /* Set the VPI/VCI MSb mask to zero so we can receive OAM cells */
 526         writel(0x00000000, card->membase + VPM);
 527
 528         card->intcnt = 0;
 529         if (request_irq
 530             (pcidev->irq, &ns_irq_handler, IRQF_SHARED, "nicstar", card) != 0) {
 531                 pr_err("nicstar%d: can't allocate IRQ %d.\n", i, pcidev->irq);
 532                 error = 9;
 533                 ns_init_card_error(card, error);
 534                 return error;
 535         }
 536
 537         /* Initialize TSQ */
 538         card->tsq.org = dma_alloc_coherent(&card->pcidev->dev,
 539                                            NS_TSQSIZE + NS_TSQ_ALIGNMENT,
 540                                            &card->tsq.dma, GFP_KERNEL);
 541         if (card->tsq.org == NULL) {
 542                 printk("nicstar%d: can't allocate TSQ.\n", i);
 543                 error = 10;
 544                 ns_init_card_error(card, error);
 545                 return error;
 546         }
 547         card->tsq.base = PTR_ALIGN(card->tsq.org, NS_TSQ_ALIGNMENT);
 548         card->tsq.next = card->tsq.base;
 549         card->tsq.last = card->tsq.base + (NS_TSQ_NUM_ENTRIES - 1);
 550         for (j = 0; j < NS_TSQ_NUM_ENTRIES; j++)
 551                 ns_tsi_init(card->tsq.base + j);
 552         writel(0x00000000, card->membase + TSQH);
 553         writel(ALIGN(card->tsq.dma, NS_TSQ_ALIGNMENT), card->membase + TSQB);
 554         PRINTK("nicstar%d: TSQ base at 0x%p.\n", i, card->tsq.base);
 555
 556         /* Initialize RSQ */
 557         card->rsq.org = dma_alloc_coherent(&card->pcidev->dev,
 558                                            NS_RSQSIZE + NS_RSQ_ALIGNMENT,
 559                                            &card->rsq.dma, GFP_KERNEL);
 560         if (card->rsq.org == NULL) {
 561                 printk("nicstar%d: can't allocate RSQ.\n", i);
 562                 error = 11;
 563                 ns_init_card_error(card, error);
 564                 return error;
 565         }
 566         card->rsq.base = PTR_ALIGN(card->rsq.org, NS_RSQ_ALIGNMENT);
 567         card->rsq.next = card->rsq.base;
 568         card->rsq.last = card->rsq.base + (NS_RSQ_NUM_ENTRIES - 1);
 569         for (j = 0; j < NS_RSQ_NUM_ENTRIES; j++)
 570                 ns_rsqe_init(card->rsq.base + j);
 571         writel(0x00000000, card->membase + RSQH);
 572         writel(ALIGN(card->rsq.dma, NS_RSQ_ALIGNMENT), card->membase + RSQB);
 573         PRINTK("nicstar%d: RSQ base at 0x%p.\n", i, card->rsq.base);
 574
 575         /* Initialize SCQ0, the only VBR SCQ used */
 576         card->scq1 = NULL;
 577         card->scq2 = NULL;
 578         card->scq0 = get_scq(card, VBR_SCQSIZE, NS_VRSCD0);
 579         if (card->scq0 == NULL) {
 580                 printk("nicstar%d: can't get SCQ0.\n", i);
 581                 error = 12;
 582                 ns_init_card_error(card, error);
 583                 return error;
 584         }
 585         u32d[0] = scq_virt_to_bus(card->scq0, card->scq0->base);
 586         u32d[1] = (u32) 0x00000000;
 587         u32d[2] = (u32) 0xffffffff;
 588         u32d[3] = (u32) 0x00000000;
 589         ns_write_sram(card, NS_VRSCD0, u32d, 4);
 590         ns_write_sram(card, NS_VRSCD1, u32d, 4);        /* These last two won't be used */
 591         ns_write_sram(card, NS_VRSCD2, u32d, 4);        /* but are initialized, just in case... */
 592         card->scq0->scd = NS_VRSCD0;
 593         PRINTK("nicstar%d: VBR-SCQ0 base at 0x%p.\n", i, card->scq0->base);
 594
 595         /* Initialize TSTs */
 596         card->tst_addr = NS_TST0;
 597         card->tst_free_entries = NS_TST_NUM_ENTRIES;
 598         data = NS_TST_OPCODE_VARIABLE;
 599         for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
 600                 ns_write_sram(card, NS_TST0 + j, &data, 1);
 601         data = ns_tste_make(NS_TST_OPCODE_END, NS_TST0);
 602         ns_write_sram(card, NS_TST0 + NS_TST_NUM_ENTRIES, &data, 1);
 603         for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
 604                 ns_write_sram(card, NS_TST1 + j, &data, 1);
 605         data = ns_tste_make(NS_TST_OPCODE_END, NS_TST1);
 606         ns_write_sram(card, NS_TST1 + NS_TST_NUM_ENTRIES, &data, 1);
 607         for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
 608                 card->tste2vc[j] = NULL;
 609         writel(NS_TST0 << 2, card->membase + TSTB);
 610
 611         /* Initialize RCT. AAL type is set on opening the VC. */
 612 #ifdef RCQ_SUPPORT
 613         u32d[0] = NS_RCTE_RAWCELLINTEN;
 614 #else
 615         u32d[0] = 0x00000000;
 616 #endif /* RCQ_SUPPORT */
 617         u32d[1] = 0x00000000;
 618         u32d[2] = 0x00000000;
 619         u32d[3] = 0xFFFFFFFF;
 620         for (j = 0; j < card->rct_size; j++)
 621                 ns_write_sram(card, j * 4, u32d, 4);
 622
 623         memset(card->vcmap, 0, sizeof(card->vcmap));
 624
 625         for (j = 0; j < NS_FRSCD_NUM; j++)
 626                 card->scd2vc[j] = NULL;
 627
 628         /* Initialize buffer levels */
 629         card->sbnr.min = MIN_SB;
 630         card->sbnr.init = NUM_SB;
 631         card->sbnr.max = MAX_SB;
 632         card->lbnr.min = MIN_LB;
 633         card->lbnr.init = NUM_LB;
 634         card->lbnr.max = MAX_LB;
 635         card->iovnr.min = MIN_IOVB;
 636         card->iovnr.init = NUM_IOVB;
 637         card->iovnr.max = MAX_IOVB;
 638         card->hbnr.min = MIN_HB;
 639         card->hbnr.init = NUM_HB;
 640         card->hbnr.max = MAX_HB;
 641
 642         card->sm_handle = NULL;
 643         card->sm_addr = 0x00000000;
 644         card->lg_handle = NULL;
 645         card->lg_addr = 0x00000000;
 646
 647         card->efbie = 1;        /* To prevent push_rxbufs from enabling the interrupt */
 648
 649         idr_init(&card->idr);
 650
 651         /* Pre-allocate some huge buffers */
 652         skb_queue_head_init(&card->hbpool.queue);
 653         card->hbpool.count = 0;
 654         for (j = 0; j < NUM_HB; j++) {
 655                 struct sk_buff *hb;
 656                 hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
 657                 if (hb == NULL) {
 658                         printk
 659                             ("nicstar%d: can't allocate %dth of %d huge buffers.\n",
 660                              i, j, NUM_HB);
 661                         error = 13;
 662                         ns_init_card_error(card, error);
 663                         return error;
 664                 }
 665                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
 666                 skb_queue_tail(&card->hbpool.queue, hb);
 667                 card->hbpool.count++;
 668         }
 669
 670         /* Allocate large buffers */
 671         skb_queue_head_init(&card->lbpool.queue);
 672         card->lbpool.count = 0; /* Not used */
 673         for (j = 0; j < NUM_LB; j++) {
 674                 struct sk_buff *lb;
 675                 lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
 676                 if (lb == NULL) {
 677                         printk
 678                             ("nicstar%d: can't allocate %dth of %d large buffers.\n",
 679                              i, j, NUM_LB);
 680                         error = 14;
 681                         ns_init_card_error(card, error);
 682                         return error;
 683                 }
 684                 NS_PRV_BUFTYPE(lb) = BUF_LG;
 685                 skb_queue_tail(&card->lbpool.queue, lb);
 686                 skb_reserve(lb, NS_SMBUFSIZE);
 687                 push_rxbufs(card, lb);
 688                 /* Due to the implementation of push_rxbufs() this is 1, not 0 */
 689                 if (j == 1) {
 690                         card->rcbuf = lb;
 691                         card->rawcell = (struct ns_rcqe *) lb->data;
 692                         card->rawch = NS_PRV_DMA(lb);
 693                 }
 694         }
 695         /* Test for strange behaviour which leads to crashes */
 696         if ((bcount =
 697              ns_stat_lfbqc_get(readl(card->membase + STAT))) < card->lbnr.min) {
 698                 printk
 699                     ("nicstar%d: Strange... Just allocated %d large buffers and lfbqc = %d.\n",
 700                      i, j, bcount);
 701                 error = 14;
 702                 ns_init_card_error(card, error);
 703                 return error;
 704         }
 705
 706         /* Allocate small buffers */
 707         skb_queue_head_init(&card->sbpool.queue);
 708         card->sbpool.count = 0; /* Not used */
 709         for (j = 0; j < NUM_SB; j++) {
 710                 struct sk_buff *sb;
 711                 sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
 712                 if (sb == NULL) {
 713                         printk
 714                             ("nicstar%d: can't allocate %dth of %d small buffers.\n",
 715                              i, j, NUM_SB);
 716                         error = 15;
 717                         ns_init_card_error(card, error);
 718                         return error;
 719                 }
 720                 NS_PRV_BUFTYPE(sb) = BUF_SM;
 721                 skb_queue_tail(&card->sbpool.queue, sb);
 722                 skb_reserve(sb, NS_AAL0_HEADER);
 723                 push_rxbufs(card, sb);
 724         }
 725         /* Test for strange behaviour which leads to crashes */
 726         if ((bcount =
 727              ns_stat_sfbqc_get(readl(card->membase + STAT))) < card->sbnr.min) {
 728                 printk
 729                     ("nicstar%d: Strange... Just allocated %d small buffers and sfbqc = %d.\n",
 730                      i, j, bcount);
 731                 error = 15;
 732                 ns_init_card_error(card, error);
 733                 return error;
 734         }
 735
 736         /* Allocate iovec buffers */
 737         skb_queue_head_init(&card->iovpool.queue);
 738         card->iovpool.count = 0;
 739         for (j = 0; j < NUM_IOVB; j++) {
 740                 struct sk_buff *iovb;
 741                 iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
 742                 if (iovb == NULL) {
 743                         printk
 744                             ("nicstar%d: can't allocate %dth of %d iovec buffers.\n",
 745                              i, j, NUM_IOVB);
 746                         error = 16;
 747                         ns_init_card_error(card, error);
 748                         return error;
 749                 }
 750                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
 751                 skb_queue_tail(&card->iovpool.queue, iovb);
 752                 card->iovpool.count++;
 753         }
 754
 755         /* Configure NICStAR */
 756         if (card->rct_size == 4096)
 757                 ns_cfg_rctsize = NS_CFG_RCTSIZE_4096_ENTRIES;
 758         else                    /* (card->rct_size == 16384) */
 759                 ns_cfg_rctsize = NS_CFG_RCTSIZE_16384_ENTRIES;
 760
 761         card->efbie = 1;
 762
 763         /* Register device */
 764         card->atmdev = atm_dev_register("nicstar", &card->pcidev->dev, &atm_ops,
 765                                         -1, NULL);
 766         if (card->atmdev == NULL) {
 767                 printk("nicstar%d: can't register device.\n", i);
 768                 error = 17;
 769                 ns_init_card_error(card, error);
 770                 return error;
 771         }
 772
 773         if (mac[i] == NULL || !mac_pton(mac[i], card->atmdev->esi)) {
 774                 nicstar_read_eprom(card->membase, NICSTAR_EPROM_MAC_ADDR_OFFSET,
 775                                    card->atmdev->esi, 6);
 776                 if (ether_addr_equal(card->atmdev->esi, "\x00\x00\x00\x00\x00\x00")) {
 777                         nicstar_read_eprom(card->membase,
 778                                            NICSTAR_EPROM_MAC_ADDR_OFFSET_ALT,
 779                                            card->atmdev->esi, 6);
 780                 }
 781         }
 782
 783         printk("nicstar%d: MAC address %pM\n", i, card->atmdev->esi);
 784
 785         card->atmdev->dev_data = card;
 786         card->atmdev->ci_range.vpi_bits = card->vpibits;
 787         card->atmdev->ci_range.vci_bits = card->vcibits;
 788         card->atmdev->link_rate = card->max_pcr;
 789         card->atmdev->phy = NULL;
 790
 791 #ifdef CONFIG_ATM_NICSTAR_USE_SUNI
 792         if (card->max_pcr == ATM_OC3_PCR)
 793                 suni_init(card->atmdev);
 794 #endif /* CONFIG_ATM_NICSTAR_USE_SUNI */
 795
 796 #ifdef CONFIG_ATM_NICSTAR_USE_IDT77105
 797         if (card->max_pcr == ATM_25_PCR)
 798                 idt77105_init(card->atmdev);
 799 #endif /* CONFIG_ATM_NICSTAR_USE_IDT77105 */
 800
 801         if (card->atmdev->phy && card->atmdev->phy->start)
 802                 card->atmdev->phy->start(card->atmdev);
 803
 804         writel(NS_CFG_RXPATH | NS_CFG_SMBUFSIZE | NS_CFG_LGBUFSIZE | NS_CFG_EFBIE | NS_CFG_RSQSIZE | NS_CFG_VPIBITS | ns_cfg_rctsize | NS_CFG_RXINT_NODELAY | NS_CFG_RAWIE |    /* Only enabled if RCQ_SUPPORT */
 805                NS_CFG_RSQAFIE | NS_CFG_TXEN | NS_CFG_TXIE | NS_CFG_TSQFIE_OPT | /* Only enabled if ENABLE_TSQFIE */
 806                NS_CFG_PHYIE, card->membase + CFG);
 807
 808         num_cards++;
 809
 810         return error;
 811 }
 812
 813 static void ns_init_card_error(ns_dev *card, int error)
 814 {
 815         if (error >= 17) {
 816                 writel(0x00000000, card->membase + CFG);
 817         }
 818         if (error >= 16) {
 819                 struct sk_buff *iovb;
 820                 while ((iovb = skb_dequeue(&card->iovpool.queue)) != NULL)
 821                         dev_kfree_skb_any(iovb);
 822         }
 823         if (error >= 15) {
 824                 struct sk_buff *sb;
 825                 while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
 826                         dev_kfree_skb_any(sb);
 827                 free_scq(card, card->scq0, NULL);
 828         }
 829         if (error >= 14) {
 830                 struct sk_buff *lb;
 831                 while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
 832                         dev_kfree_skb_any(lb);
 833         }
 834         if (error >= 13) {
 835                 struct sk_buff *hb;
 836                 while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL)
 837                         dev_kfree_skb_any(hb);
 838         }
 839         if (error >= 12) {
 840                 dma_free_coherent(&card->pcidev->dev, NS_RSQSIZE + NS_RSQ_ALIGNMENT,
 841                                 card->rsq.org, card->rsq.dma);
 842         }
 843         if (error >= 11) {
 844                 dma_free_coherent(&card->pcidev->dev, NS_TSQSIZE + NS_TSQ_ALIGNMENT,
 845                                 card->tsq.org, card->tsq.dma);
 846         }
 847         if (error >= 10) {
 848                 free_irq(card->pcidev->irq, card);
 849         }
 850         if (error >= 4) {
 851                 iounmap(card->membase);
 852         }
 853         if (error >= 3) {
 854                 pci_disable_device(card->pcidev);
 855                 kfree(card);
 856         }
 857 }
 858
 859 static scq_info *get_scq(ns_dev *card, int size, u32 scd)
 860 {
 861         scq_info *scq;
 862         int i;
 863
 864         if (size != VBR_SCQSIZE && size != CBR_SCQSIZE)
 865                 return NULL;
 866
 867         scq = kmalloc(sizeof(*scq), GFP_KERNEL);
 868         if (!scq)
 869                 return NULL;
 870         scq->org = dma_alloc_coherent(&card->pcidev->dev,
 871                                       2 * size,  &scq->dma, GFP_KERNEL);
 872         if (!scq->org) {
 873                 kfree(scq);
 874                 return NULL;
 875         }
 876         scq->skb = kmalloc_array(size / NS_SCQE_SIZE,
 877                                  sizeof(*scq->skb),
 878                                  GFP_KERNEL);
 879         if (!scq->skb) {
 880                 dma_free_coherent(&card->pcidev->dev,
 881                                   2 * size, scq->org, scq->dma);
 882                 kfree(scq);
 883                 return NULL;
 884         }
 885         scq->num_entries = size / NS_SCQE_SIZE;
 886         scq->base = PTR_ALIGN(scq->org, size);
 887         scq->next = scq->base;
 888         scq->last = scq->base + (scq->num_entries - 1);
 889         scq->tail = scq->last;
 890         scq->scd = scd;
 891         scq->num_entries = size / NS_SCQE_SIZE;
 892         scq->tbd_count = 0;
 893         init_waitqueue_head(&scq->scqfull_waitq);
 894         scq->full = 0;
 895         spin_lock_init(&scq->lock);
 896
 897         for (i = 0; i < scq->num_entries; i++)
 898                 scq->skb[i] = NULL;
 899
 900         return scq;
 901 }
 902
 903 /* For variable rate SCQ vcc must be NULL */
 904 static void free_scq(ns_dev *card, scq_info *scq, struct atm_vcc *vcc)
 905 {
 906         int i;
 907
 908         if (scq->num_entries == VBR_SCQ_NUM_ENTRIES)
 909                 for (i = 0; i < scq->num_entries; i++) {
 910                         if (scq->skb[i] != NULL) {
 911                                 vcc = ATM_SKB(scq->skb[i])->vcc;
 912                                 if (vcc->pop != NULL)
 913                                         vcc->pop(vcc, scq->skb[i]);
 914                                 else
 915                                         dev_kfree_skb_any(scq->skb[i]);
 916                         }
 917         } else {                /* vcc must be != NULL */
 918
 919                 if (vcc == NULL) {
 920                         printk
 921                             ("nicstar: free_scq() called with vcc == NULL for fixed rate scq.");
 922                         for (i = 0; i < scq->num_entries; i++)
 923                                 dev_kfree_skb_any(scq->skb[i]);
 924                 } else
 925                         for (i = 0; i < scq->num_entries; i++) {
 926                                 if (scq->skb[i] != NULL) {
 927                                         if (vcc->pop != NULL)
 928                                                 vcc->pop(vcc, scq->skb[i]);
 929                                         else
 930                                                 dev_kfree_skb_any(scq->skb[i]);
 931                                 }
 932                         }
 933         }
 934         kfree(scq->skb);
 935         dma_free_coherent(&card->pcidev->dev,
 936                           2 * (scq->num_entries == VBR_SCQ_NUM_ENTRIES ?
 937                                VBR_SCQSIZE : CBR_SCQSIZE),
 938                           scq->org, scq->dma);
 939         kfree(scq);
 940 }
 941
 942 /* The handles passed must be pointers to the sk_buff containing the small
 943    or large buffer(s) cast to u32. */
 944 static void push_rxbufs(ns_dev * card, struct sk_buff *skb)
 945 {
 946         struct sk_buff *handle1, *handle2;
 947         int id1, id2;
 948         u32 addr1, addr2;
 949         u32 stat;
 950         unsigned long flags;
 951
 952         /* *BARF* */
 953         handle2 = NULL;
 954         addr2 = 0;
 955         handle1 = skb;
 956         addr1 = dma_map_single(&card->pcidev->dev,
 957                                skb->data,
 958                                (NS_PRV_BUFTYPE(skb) == BUF_SM
 959                                 ? NS_SMSKBSIZE : NS_LGSKBSIZE),
 960                                DMA_TO_DEVICE);
 961         NS_PRV_DMA(skb) = addr1; /* save so we can unmap later */
 962
 963 #ifdef GENERAL_DEBUG
 964         if (!addr1)
 965                 printk("nicstar%d: push_rxbufs called with addr1 = 0.\n",
 966                        card->index);
 967 #endif /* GENERAL_DEBUG */
 968
 969         stat = readl(card->membase + STAT);
 970         card->sbfqc = ns_stat_sfbqc_get(stat);
 971         card->lbfqc = ns_stat_lfbqc_get(stat);
 972         if (NS_PRV_BUFTYPE(skb) == BUF_SM) {
 973                 if (!addr2) {
 974                         if (card->sm_addr) {
 975                                 addr2 = card->sm_addr;
 976                                 handle2 = card->sm_handle;
 977                                 card->sm_addr = 0x00000000;
 978                                 card->sm_handle = NULL;
 979                         } else {        /* (!sm_addr) */
 980
 981                                 card->sm_addr = addr1;
 982                                 card->sm_handle = handle1;
 983                         }
 984                 }
 985         } else {                /* buf_type == BUF_LG */
 986
 987                 if (!addr2) {
 988                         if (card->lg_addr) {
 989                                 addr2 = card->lg_addr;
 990                                 handle2 = card->lg_handle;
 991                                 card->lg_addr = 0x00000000;
 992                                 card->lg_handle = NULL;
 993                         } else {        /* (!lg_addr) */
 994
 995                                 card->lg_addr = addr1;
 996                                 card->lg_handle = handle1;
 997                         }
 998                 }
 999         }
1000
1001         if (addr2) {
1002                 if (NS_PRV_BUFTYPE(skb) == BUF_SM) {
1003                         if (card->sbfqc >= card->sbnr.max) {
1004                                 skb_unlink(handle1, &card->sbpool.queue);
1005                                 dev_kfree_skb_any(handle1);
1006                                 skb_unlink(handle2, &card->sbpool.queue);
1007                                 dev_kfree_skb_any(handle2);
1008                                 return;
1009                         } else
1010                                 card->sbfqc += 2;
1011                 } else {        /* (buf_type == BUF_LG) */
1012
1013                         if (card->lbfqc >= card->lbnr.max) {
1014                                 skb_unlink(handle1, &card->lbpool.queue);
1015                                 dev_kfree_skb_any(handle1);
1016                                 skb_unlink(handle2, &card->lbpool.queue);
1017                                 dev_kfree_skb_any(handle2);
1018                                 return;
1019                         } else
1020                                 card->lbfqc += 2;
1021                 }
1022
1023                 id1 = idr_alloc(&card->idr, handle1, 0, 0, GFP_ATOMIC);
1024                 if (id1 < 0)
1025                         goto out;
1026
1027                 id2 = idr_alloc(&card->idr, handle2, 0, 0, GFP_ATOMIC);
1028                 if (id2 < 0)
1029                         goto out;
1030
1031                 spin_lock_irqsave(&card->res_lock, flags);
1032                 while (CMD_BUSY(card)) ;
1033                 writel(addr2, card->membase + DR3);
1034                 writel(id2, card->membase + DR2);
1035                 writel(addr1, card->membase + DR1);
1036                 writel(id1, card->membase + DR0);
1037                 writel(NS_CMD_WRITE_FREEBUFQ | NS_PRV_BUFTYPE(skb),
1038                        card->membase + CMD);
1039                 spin_unlock_irqrestore(&card->res_lock, flags);
1040
1041                 XPRINTK("nicstar%d: Pushing %s buffers at 0x%x and 0x%x.\n",
1042                         card->index,
1043                         (NS_PRV_BUFTYPE(skb) == BUF_SM ? "small" : "large"),
1044                         addr1, addr2);
1045         }
1046
1047         if (!card->efbie && card->sbfqc >= card->sbnr.min &&
1048             card->lbfqc >= card->lbnr.min) {
1049                 card->efbie = 1;
1050                 writel((readl(card->membase + CFG) | NS_CFG_EFBIE),
1051                        card->membase + CFG);
1052         }
1053
1054 out:
1055         return;
1056 }
1057
1058 static irqreturn_t ns_irq_handler(int irq, void *dev_id)
1059 {
1060         u32 stat_r;
1061         ns_dev *card;
1062         struct atm_dev *dev;
1063         unsigned long flags;
1064
1065         card = (ns_dev *) dev_id;
1066         dev = card->atmdev;
1067         card->intcnt++;
1068
1069         PRINTK("nicstar%d: NICStAR generated an interrupt\n", card->index);
1070
1071         spin_lock_irqsave(&card->int_lock, flags);
1072
1073         stat_r = readl(card->membase + STAT);
1074
1075         /* Transmit Status Indicator has been written to T. S. Queue */
1076         if (stat_r & NS_STAT_TSIF) {
1077                 TXPRINTK("nicstar%d: TSI interrupt\n", card->index);
1078                 process_tsq(card);
1079                 writel(NS_STAT_TSIF, card->membase + STAT);
1080         }
1081
1082         /* Incomplete CS-PDU has been transmitted */
1083         if (stat_r & NS_STAT_TXICP) {
1084                 writel(NS_STAT_TXICP, card->membase + STAT);
1085                 TXPRINTK("nicstar%d: Incomplete CS-PDU transmitted.\n",
1086                          card->index);
1087         }
1088
1089         /* Transmit Status Queue 7/8 full */
1090         if (stat_r & NS_STAT_TSQF) {
1091                 writel(NS_STAT_TSQF, card->membase + STAT);
1092                 PRINTK("nicstar%d: TSQ full.\n", card->index);
1093                 process_tsq(card);
1094         }
1095
1096         /* Timer overflow */
1097         if (stat_r & NS_STAT_TMROF) {
1098                 writel(NS_STAT_TMROF, card->membase + STAT);
1099                 PRINTK("nicstar%d: Timer overflow.\n", card->index);
1100         }
1101
1102         /* PHY device interrupt signal active */
1103         if (stat_r & NS_STAT_PHYI) {
1104                 writel(NS_STAT_PHYI, card->membase + STAT);
1105                 PRINTK("nicstar%d: PHY interrupt.\n", card->index);
1106                 if (dev->phy && dev->phy->interrupt) {
1107                         dev->phy->interrupt(dev);
1108                 }
1109         }
1110
1111         /* Small Buffer Queue is full */
1112         if (stat_r & NS_STAT_SFBQF) {
1113                 writel(NS_STAT_SFBQF, card->membase + STAT);
1114                 printk("nicstar%d: Small free buffer queue is full.\n",
1115                        card->index);
1116         }
1117
1118         /* Large Buffer Queue is full */
1119         if (stat_r & NS_STAT_LFBQF) {
1120                 writel(NS_STAT_LFBQF, card->membase + STAT);
1121                 printk("nicstar%d: Large free buffer queue is full.\n",
1122                        card->index);
1123         }
1124
1125         /* Receive Status Queue is full */
1126         if (stat_r & NS_STAT_RSQF) {
1127                 writel(NS_STAT_RSQF, card->membase + STAT);
1128                 printk("nicstar%d: RSQ full.\n", card->index);
1129                 process_rsq(card);
1130         }
1131
1132         /* Complete CS-PDU received */
1133         if (stat_r & NS_STAT_EOPDU) {
1134                 RXPRINTK("nicstar%d: End of CS-PDU received.\n", card->index);
1135                 process_rsq(card);
1136                 writel(NS_STAT_EOPDU, card->membase + STAT);
1137         }
1138
1139         /* Raw cell received */
1140         if (stat_r & NS_STAT_RAWCF) {
1141                 writel(NS_STAT_RAWCF, card->membase + STAT);
1142 #ifndef RCQ_SUPPORT
1143                 printk("nicstar%d: Raw cell received and no support yet...\n",
1144                        card->index);
1145 #endif /* RCQ_SUPPORT */
1146                 /* NOTE: the following procedure may keep a raw cell pending until the
1147                    next interrupt. As this preliminary support is only meant to
1148                    avoid buffer leakage, this is not an issue. */
1149                 while (readl(card->membase + RAWCT) != card->rawch) {
1150
1151                         if (ns_rcqe_islast(card->rawcell)) {
1152                                 struct sk_buff *oldbuf;
1153
1154                                 oldbuf = card->rcbuf;
1155                                 card->rcbuf = idr_find(&card->idr,
1156                                                        ns_rcqe_nextbufhandle(card->rawcell));
1157                                 card->rawch = NS_PRV_DMA(card->rcbuf);
1158                                 card->rawcell = (struct ns_rcqe *)
1159                                                 card->rcbuf->data;
1160                                 recycle_rx_buf(card, oldbuf);
1161                         } else {
1162                                 card->rawch += NS_RCQE_SIZE;
1163                                 card->rawcell++;
1164                         }
1165                 }
1166         }
1167
1168         /* Small buffer queue is empty */
1169         if (stat_r & NS_STAT_SFBQE) {
1170                 int i;
1171                 struct sk_buff *sb;
1172
1173                 writel(NS_STAT_SFBQE, card->membase + STAT);
1174                 printk("nicstar%d: Small free buffer queue empty.\n",
1175                        card->index);
1176                 for (i = 0; i < card->sbnr.min; i++) {
1177                         sb = dev_alloc_skb(NS_SMSKBSIZE);
1178                         if (sb == NULL) {
1179                                 writel(readl(card->membase + CFG) &
1180                                        ~NS_CFG_EFBIE, card->membase + CFG);
1181                                 card->efbie = 0;
1182                                 break;
1183                         }
1184                         NS_PRV_BUFTYPE(sb) = BUF_SM;
1185                         skb_queue_tail(&card->sbpool.queue, sb);
1186                         skb_reserve(sb, NS_AAL0_HEADER);
1187                         push_rxbufs(card, sb);
1188                 }
1189                 card->sbfqc = i;
1190                 process_rsq(card);
1191         }
1192
1193         /* Large buffer queue empty */
1194         if (stat_r & NS_STAT_LFBQE) {
1195                 int i;
1196                 struct sk_buff *lb;
1197
1198                 writel(NS_STAT_LFBQE, card->membase + STAT);
1199                 printk("nicstar%d: Large free buffer queue empty.\n",
1200                        card->index);
1201                 for (i = 0; i < card->lbnr.min; i++) {
1202                         lb = dev_alloc_skb(NS_LGSKBSIZE);
1203                         if (lb == NULL) {
1204                                 writel(readl(card->membase + CFG) &
1205                                        ~NS_CFG_EFBIE, card->membase + CFG);
1206                                 card->efbie = 0;
1207                                 break;
1208                         }
1209                         NS_PRV_BUFTYPE(lb) = BUF_LG;
1210                         skb_queue_tail(&card->lbpool.queue, lb);
1211                         skb_reserve(lb, NS_SMBUFSIZE);
1212                         push_rxbufs(card, lb);
1213                 }
1214                 card->lbfqc = i;
1215                 process_rsq(card);
1216         }
1217
1218         /* Receive Status Queue is 7/8 full */
1219         if (stat_r & NS_STAT_RSQAF) {
1220                 writel(NS_STAT_RSQAF, card->membase + STAT);
1221                 RXPRINTK("nicstar%d: RSQ almost full.\n", card->index);
1222                 process_rsq(card);
1223         }
1224
1225         spin_unlock_irqrestore(&card->int_lock, flags);
1226         PRINTK("nicstar%d: end of interrupt service\n", card->index);
1227         return IRQ_HANDLED;
1228 }
1229
1230 static int ns_open(struct atm_vcc *vcc)
1231 {
1232         ns_dev *card;
1233         vc_map *vc;
1234         unsigned long tmpl, modl;
1235         int tcr, tcra;          /* target cell rate, and absolute value */
1236         int n = 0;              /* Number of entries in the TST. Initialized to remove
1237                                    the compiler warning. */
1238         u32 u32d[4];
1239         int frscdi = 0;         /* Index of the SCD. Initialized to remove the compiler
1240                                    warning. How I wish compilers were clever enough to
1241                                    tell which variables can truly be used
1242                                    uninitialized... */
1243         int inuse;              /* tx or rx vc already in use by another vcc */
1244         short vpi = vcc->vpi;
1245         int vci = vcc->vci;
1246
1247         card = (ns_dev *) vcc->dev->dev_data;
1248         PRINTK("nicstar%d: opening vpi.vci %d.%d \n", card->index, (int)vpi,
1249                vci);
1250         if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0) {
1251                 PRINTK("nicstar%d: unsupported AAL.\n", card->index);
1252                 return -EINVAL;
1253         }
1254
1255         vc = &(card->vcmap[vpi << card->vcibits | vci]);
1256         vcc->dev_data = vc;
1257
1258         inuse = 0;
1259         if (vcc->qos.txtp.traffic_class != ATM_NONE && vc->tx)
1260                 inuse = 1;
1261         if (vcc->qos.rxtp.traffic_class != ATM_NONE && vc->rx)
1262                 inuse += 2;
1263         if (inuse) {
1264                 printk("nicstar%d: %s vci already in use.\n", card->index,
1265                        inuse == 1 ? "tx" : inuse == 2 ? "rx" : "tx and rx");
1266                 return -EINVAL;
1267         }
1268
1269         set_bit(ATM_VF_ADDR, &vcc->flags);
1270
1271         /* NOTE: You are not allowed to modify an open connection's QOS. To change
1272            that, remove the ATM_VF_PARTIAL flag checking. There may be other changes
1273            needed to do that. */
1274         if (!test_bit(ATM_VF_PARTIAL, &vcc->flags)) {
1275                 scq_info *scq;
1276
1277                 set_bit(ATM_VF_PARTIAL, &vcc->flags);
1278                 if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1279                         /* Check requested cell rate and availability of SCD */
1280                         if (vcc->qos.txtp.max_pcr == 0 && vcc->qos.txtp.pcr == 0
1281                             && vcc->qos.txtp.min_pcr == 0) {
1282                                 PRINTK
1283                                     ("nicstar%d: trying to open a CBR vc with cell rate = 0 \n",
1284                                      card->index);
1285                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1286                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1287                                 return -EINVAL;
1288                         }
1289
1290                         tcr = atm_pcr_goal(&(vcc->qos.txtp));
1291                         tcra = tcr >= 0 ? tcr : -tcr;
1292
1293                         PRINTK("nicstar%d: target cell rate = %d.\n",
1294                                card->index, vcc->qos.txtp.max_pcr);
1295
1296                         tmpl =
1297                             (unsigned long)tcra *(unsigned long)
1298                             NS_TST_NUM_ENTRIES;
1299                         modl = tmpl % card->max_pcr;
1300
1301                         n = (int)(tmpl / card->max_pcr);
1302                         if (tcr > 0) {
1303                                 if (modl > 0)
1304                                         n++;
1305                         } else if (tcr == 0) {
1306                                 if ((n =
1307                                      (card->tst_free_entries -
1308                                       NS_TST_RESERVED)) <= 0) {
1309                                         PRINTK
1310                                             ("nicstar%d: no CBR bandwidth free.\n",
1311                                              card->index);
1312                                         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1313                                         clear_bit(ATM_VF_ADDR, &vcc->flags);
1314                                         return -EINVAL;
1315                                 }
1316                         }
1317
1318                         if (n == 0) {
1319                                 printk
1320                                     ("nicstar%d: selected bandwidth < granularity.\n",
1321                                      card->index);
1322                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1323                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1324                                 return -EINVAL;
1325                         }
1326
1327                         if (n > (card->tst_free_entries - NS_TST_RESERVED)) {
1328                                 PRINTK
1329                                     ("nicstar%d: not enough free CBR bandwidth.\n",
1330                                      card->index);
1331                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1332                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1333                                 return -EINVAL;
1334                         } else
1335                                 card->tst_free_entries -= n;
1336
1337                         XPRINTK("nicstar%d: writing %d tst entries.\n",
1338                                 card->index, n);
1339                         for (frscdi = 0; frscdi < NS_FRSCD_NUM; frscdi++) {
1340                                 if (card->scd2vc[frscdi] == NULL) {
1341                                         card->scd2vc[frscdi] = vc;
1342                                         break;
1343                                 }
1344                         }
1345                         if (frscdi == NS_FRSCD_NUM) {
1346                                 PRINTK
1347                                     ("nicstar%d: no SCD available for CBR channel.\n",
1348                                      card->index);
1349                                 card->tst_free_entries += n;
1350                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1351                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1352                                 return -EBUSY;
1353                         }
1354
1355                         vc->cbr_scd = NS_FRSCD + frscdi * NS_FRSCD_SIZE;
1356
1357                         scq = get_scq(card, CBR_SCQSIZE, vc->cbr_scd);
1358                         if (scq == NULL) {
1359                                 PRINTK("nicstar%d: can't get fixed rate SCQ.\n",
1360                                        card->index);
1361                                 card->scd2vc[frscdi] = NULL;
1362                                 card->tst_free_entries += n;
1363                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1364                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1365                                 return -ENOMEM;
1366                         }
1367                         vc->scq = scq;
1368                         u32d[0] = scq_virt_to_bus(scq, scq->base);
1369                         u32d[1] = (u32) 0x00000000;
1370                         u32d[2] = (u32) 0xffffffff;
1371                         u32d[3] = (u32) 0x00000000;
1372                         ns_write_sram(card, vc->cbr_scd, u32d, 4);
1373
1374                         fill_tst(card, n, vc);
1375                 } else if (vcc->qos.txtp.traffic_class == ATM_UBR) {
1376                         vc->cbr_scd = 0x00000000;
1377                         vc->scq = card->scq0;
1378                 }
1379
1380                 if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1381                         vc->tx = 1;
1382                         vc->tx_vcc = vcc;
1383                         vc->tbd_count = 0;
1384                 }
1385                 if (vcc->qos.rxtp.traffic_class != ATM_NONE) {
1386                         u32 status;
1387
1388                         vc->rx = 1;
1389                         vc->rx_vcc = vcc;
1390                         vc->rx_iov = NULL;
1391
1392                         /* Open the connection in hardware */
1393                         if (vcc->qos.aal == ATM_AAL5)
1394                                 status = NS_RCTE_AAL5 | NS_RCTE_CONNECTOPEN;
1395                         else    /* vcc->qos.aal == ATM_AAL0 */
1396                                 status = NS_RCTE_AAL0 | NS_RCTE_CONNECTOPEN;
1397 #ifdef RCQ_SUPPORT
1398                         status |= NS_RCTE_RAWCELLINTEN;
1399 #endif /* RCQ_SUPPORT */
1400                         ns_write_sram(card,
1401                                       NS_RCT +
1402                                       (vpi << card->vcibits | vci) *
1403                                       NS_RCT_ENTRY_SIZE, &status, 1);
1404                 }
1405
1406         }
1407
1408         set_bit(ATM_VF_READY, &vcc->flags);
1409         return 0;
1410 }
1411
1412 static void ns_close(struct atm_vcc *vcc)
1413 {
1414         vc_map *vc;
1415         ns_dev *card;
1416         u32 data;
1417         int i;
1418
1419         vc = vcc->dev_data;
1420         card = vcc->dev->dev_data;
1421         PRINTK("nicstar%d: closing vpi.vci %d.%d \n", card->index,
1422                (int)vcc->vpi, vcc->vci);
1423
1424         clear_bit(ATM_VF_READY, &vcc->flags);
1425
1426         if (vcc->qos.rxtp.traffic_class != ATM_NONE) {
1427                 u32 addr;
1428                 unsigned long flags;
1429
1430                 addr =
1431                     NS_RCT +
1432                     (vcc->vpi << card->vcibits | vcc->vci) * NS_RCT_ENTRY_SIZE;
1433                 spin_lock_irqsave(&card->res_lock, flags);
1434                 while (CMD_BUSY(card)) ;
1435                 writel(NS_CMD_CLOSE_CONNECTION | addr << 2,
1436                        card->membase + CMD);
1437                 spin_unlock_irqrestore(&card->res_lock, flags);
1438
1439                 vc->rx = 0;
1440                 if (vc->rx_iov != NULL) {
1441                         struct sk_buff *iovb;
1442                         u32 stat;
1443
1444                         stat = readl(card->membase + STAT);
1445                         card->sbfqc = ns_stat_sfbqc_get(stat);
1446                         card->lbfqc = ns_stat_lfbqc_get(stat);
1447
1448                         PRINTK
1449                             ("nicstar%d: closing a VC with pending rx buffers.\n",
1450                              card->index);
1451                         iovb = vc->rx_iov;
1452                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
1453                                               NS_PRV_IOVCNT(iovb));
1454                         NS_PRV_IOVCNT(iovb) = 0;
1455                         spin_lock_irqsave(&card->int_lock, flags);
1456                         recycle_iov_buf(card, iovb);
1457                         spin_unlock_irqrestore(&card->int_lock, flags);
1458                         vc->rx_iov = NULL;
1459                 }
1460         }
1461
1462         if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1463                 vc->tx = 0;
1464         }
1465
1466         if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1467                 unsigned long flags;
1468                 ns_scqe *scqep;
1469                 scq_info *scq;
1470
1471                 scq = vc->scq;
1472
1473                 for (;;) {
1474                         spin_lock_irqsave(&scq->lock, flags);
1475                         scqep = scq->next;
1476                         if (scqep == scq->base)
1477                                 scqep = scq->last;
1478                         else
1479                                 scqep--;
1480                         if (scqep == scq->tail) {
1481                                 spin_unlock_irqrestore(&scq->lock, flags);
1482                                 break;
1483                         }
1484                         /* If the last entry is not a TSR, place one in the SCQ in order to
1485                            be able to completely drain it and then close. */
1486                         if (!ns_scqe_is_tsr(scqep) && scq->tail != scq->next) {
1487                                 ns_scqe tsr;
1488                                 u32 scdi, scqi;
1489                                 u32 data;
1490                                 int index;
1491
1492                                 tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
1493                                 scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
1494                                 scqi = scq->next - scq->base;
1495                                 tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
1496                                 tsr.word_3 = 0x00000000;
1497                                 tsr.word_4 = 0x00000000;
1498                                 *scq->next = tsr;
1499                                 index = (int)scqi;
1500                                 scq->skb[index] = NULL;
1501                                 if (scq->next == scq->last)
1502                                         scq->next = scq->base;
1503                                 else
1504                                         scq->next++;
1505                                 data = scq_virt_to_bus(scq, scq->next);
1506                                 ns_write_sram(card, scq->scd, &data, 1);
1507                         }
1508                         spin_unlock_irqrestore(&scq->lock, flags);
1509                         schedule();
1510                 }
1511
1512                 /* Free all TST entries */
1513                 data = NS_TST_OPCODE_VARIABLE;
1514                 for (i = 0; i < NS_TST_NUM_ENTRIES; i++) {
1515                         if (card->tste2vc[i] == vc) {
1516                                 ns_write_sram(card, card->tst_addr + i, &data,
1517                                               1);
1518                                 card->tste2vc[i] = NULL;
1519                                 card->tst_free_entries++;
1520                         }
1521                 }
1522
1523                 card->scd2vc[(vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE] = NULL;
1524                 free_scq(card, vc->scq, vcc);
1525         }
1526
1527         /* remove all references to vcc before deleting it */
1528         if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1529                 unsigned long flags;
1530                 scq_info *scq = card->scq0;
1531
1532                 spin_lock_irqsave(&scq->lock, flags);
1533
1534                 for (i = 0; i < scq->num_entries; i++) {
1535                         if (scq->skb[i] && ATM_SKB(scq->skb[i])->vcc == vcc) {
1536                                 ATM_SKB(scq->skb[i])->vcc = NULL;
1537                                 atm_return(vcc, scq->skb[i]->truesize);
1538                                 PRINTK
1539                                     ("nicstar: deleted pending vcc mapping\n");
1540                         }
1541                 }
1542
1543                 spin_unlock_irqrestore(&scq->lock, flags);
1544         }
1545
1546         vcc->dev_data = NULL;
1547         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1548         clear_bit(ATM_VF_ADDR, &vcc->flags);
1549
1550 #ifdef RX_DEBUG
1551         {
1552                 u32 stat, cfg;
1553                 stat = readl(card->membase + STAT);
1554                 cfg = readl(card->membase + CFG);
1555                 printk("STAT = 0x%08X  CFG = 0x%08X  \n", stat, cfg);
1556                 printk
1557                     ("TSQ: base = 0x%p  next = 0x%p  last = 0x%p  TSQT = 0x%08X \n",
1558                      card->tsq.base, card->tsq.next,
1559                      card->tsq.last, readl(card->membase + TSQT));
1560                 printk
1561                     ("RSQ: base = 0x%p  next = 0x%p  last = 0x%p  RSQT = 0x%08X \n",
1562                      card->rsq.base, card->rsq.next,
1563                      card->rsq.last, readl(card->membase + RSQT));
1564                 printk("Empty free buffer queue interrupt %s \n",
1565                        card->efbie ? "enabled" : "disabled");
1566                 printk("SBCNT = %d  count = %d   LBCNT = %d count = %d \n",
1567                        ns_stat_sfbqc_get(stat), card->sbpool.count,
1568                        ns_stat_lfbqc_get(stat), card->lbpool.count);
1569                 printk("hbpool.count = %d  iovpool.count = %d \n",
1570                        card->hbpool.count, card->iovpool.count);
1571         }
1572 #endif /* RX_DEBUG */
1573 }
1574
1575 static void fill_tst(ns_dev * card, int n, vc_map * vc)
1576 {
1577         u32 new_tst;
1578         unsigned long cl;
1579         int e, r;
1580         u32 data;
1581
1582         /* It would be very complicated to keep the two TSTs synchronized while
1583            assuring that writes are only made to the inactive TST. So, for now I
1584            will use only one TST. If problems occur, I will change this again */
1585
1586         new_tst = card->tst_addr;
1587
1588         /* Fill procedure */
1589
1590         for (e = 0; e < NS_TST_NUM_ENTRIES; e++) {
1591                 if (card->tste2vc[e] == NULL)
1592                         break;
1593         }
1594         if (e == NS_TST_NUM_ENTRIES) {
1595                 printk("nicstar%d: No free TST entries found. \n", card->index);
1596                 return;
1597         }
1598
1599         r = n;
1600         cl = NS_TST_NUM_ENTRIES;
1601         data = ns_tste_make(NS_TST_OPCODE_FIXED, vc->cbr_scd);
1602
1603         while (r > 0) {
1604                 if (cl >= NS_TST_NUM_ENTRIES && card->tste2vc[e] == NULL) {
1605                         card->tste2vc[e] = vc;
1606                         ns_write_sram(card, new_tst + e, &data, 1);
1607                         cl -= NS_TST_NUM_ENTRIES;
1608                         r--;
1609                 }
1610
1611                 if (++e == NS_TST_NUM_ENTRIES) {
1612                         e = 0;
1613                 }
1614                 cl += n;
1615         }
1616
1617         /* End of fill procedure */
1618
1619         data = ns_tste_make(NS_TST_OPCODE_END, new_tst);
1620         ns_write_sram(card, new_tst + NS_TST_NUM_ENTRIES, &data, 1);
1621         ns_write_sram(card, card->tst_addr + NS_TST_NUM_ENTRIES, &data, 1);
1622         card->tst_addr = new_tst;
1623 }
1624
1625 static int ns_send(struct atm_vcc *vcc, struct sk_buff *skb)
1626 {
1627         ns_dev *card;
1628         vc_map *vc;
1629         scq_info *scq;
1630         unsigned long buflen;
1631         ns_scqe scqe;
1632         u32 flags;              /* TBD flags, not CPU flags */
1633
1634         card = vcc->dev->dev_data;
1635         TXPRINTK("nicstar%d: ns_send() called.\n", card->index);
1636         if ((vc = (vc_map *) vcc->dev_data) == NULL) {
1637                 printk("nicstar%d: vcc->dev_data == NULL on ns_send().\n",
1638                        card->index);
1639                 atomic_inc(&vcc->stats->tx_err);
1640                 dev_kfree_skb_any(skb);
1641                 return -EINVAL;
1642         }
1643
1644         if (!vc->tx) {
1645                 printk("nicstar%d: Trying to transmit on a non-tx VC.\n",
1646                        card->index);
1647                 atomic_inc(&vcc->stats->tx_err);
1648                 dev_kfree_skb_any(skb);
1649                 return -EINVAL;
1650         }
1651
1652         if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0) {
1653                 printk("nicstar%d: Only AAL0 and AAL5 are supported.\n",
1654                        card->index);
1655                 atomic_inc(&vcc->stats->tx_err);
1656                 dev_kfree_skb_any(skb);
1657                 return -EINVAL;
1658         }
1659
1660         if (skb_shinfo(skb)->nr_frags != 0) {
1661                 printk("nicstar%d: No scatter-gather yet.\n", card->index);
1662                 atomic_inc(&vcc->stats->tx_err);
1663                 dev_kfree_skb_any(skb);
1664                 return -EINVAL;
1665         }
1666
1667         ATM_SKB(skb)->vcc = vcc;
1668
1669         NS_PRV_DMA(skb) = dma_map_single(&card->pcidev->dev, skb->data,
1670                                          skb->len, DMA_TO_DEVICE);
1671
1672         if (vcc->qos.aal == ATM_AAL5) {
1673                 buflen = (skb->len + 47 + 8) / 48 * 48; /* Multiple of 48 */
1674                 flags = NS_TBD_AAL5;
1675                 scqe.word_2 = cpu_to_le32(NS_PRV_DMA(skb));
1676                 scqe.word_3 = cpu_to_le32(skb->len);
1677                 scqe.word_4 =
1678                     ns_tbd_mkword_4(0, (u32) vcc->vpi, (u32) vcc->vci, 0,
1679                                     ATM_SKB(skb)->
1680                                     atm_options & ATM_ATMOPT_CLP ? 1 : 0);
1681                 flags |= NS_TBD_EOPDU;
1682         } else {                /* (vcc->qos.aal == ATM_AAL0) */
1683
1684                 buflen = ATM_CELL_PAYLOAD;      /* i.e., 48 bytes */
1685                 flags = NS_TBD_AAL0;
1686                 scqe.word_2 = cpu_to_le32(NS_PRV_DMA(skb) + NS_AAL0_HEADER);
1687                 scqe.word_3 = cpu_to_le32(0x00000000);
1688                 if (*skb->data & 0x02)  /* Payload type 1 - end of pdu */
1689                         flags |= NS_TBD_EOPDU;
1690                 scqe.word_4 =
1691                     cpu_to_le32(*((u32 *) skb->data) & ~NS_TBD_VC_MASK);
1692                 /* Force the VPI/VCI to be the same as in VCC struct */
1693                 scqe.word_4 |=
1694                     cpu_to_le32((((u32) vcc->
1695                                   vpi) << NS_TBD_VPI_SHIFT | ((u32) vcc->
1696                                                               vci) <<
1697                                  NS_TBD_VCI_SHIFT) & NS_TBD_VC_MASK);
1698         }
1699
1700         if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1701                 scqe.word_1 = ns_tbd_mkword_1_novbr(flags, (u32) buflen);
1702                 scq = ((vc_map *) vcc->dev_data)->scq;
1703         } else {
1704                 scqe.word_1 =
1705                     ns_tbd_mkword_1(flags, (u32) 1, (u32) 1, (u32) buflen);
1706                 scq = card->scq0;
1707         }
1708
1709         if (push_scqe(card, vc, scq, &scqe, skb) != 0) {
1710                 atomic_inc(&vcc->stats->tx_err);
1711                 dma_unmap_single(&card->pcidev->dev, NS_PRV_DMA(skb), skb->len,
1712                                  DMA_TO_DEVICE);
1713                 dev_kfree_skb_any(skb);
1714                 return -EIO;
1715         }
1716         atomic_inc(&vcc->stats->tx);
1717
1718         return 0;
1719 }
1720
1721 static int push_scqe(ns_dev * card, vc_map * vc, scq_info * scq, ns_scqe * tbd,
1722                      struct sk_buff *skb)
1723 {
1724         unsigned long flags;
1725         ns_scqe tsr;
1726         u32 scdi, scqi;
1727         int scq_is_vbr;
1728         u32 data;
1729         int index;
1730
1731         spin_lock_irqsave(&scq->lock, flags);
1732         while (scq->tail == scq->next) {
1733                 if (in_interrupt()) {
1734                         spin_unlock_irqrestore(&scq->lock, flags);
1735                         printk("nicstar%d: Error pushing TBD.\n", card->index);
1736                         return 1;
1737                 }
1738
1739                 scq->full = 1;
1740                 wait_event_interruptible_lock_irq_timeout(scq->scqfull_waitq,
1741                                                           scq->tail != scq->next,
1742                                                           scq->lock,
1743                                                           SCQFULL_TIMEOUT);
1744
1745                 if (scq->full) {
1746                         spin_unlock_irqrestore(&scq->lock, flags);
1747                         printk("nicstar%d: Timeout pushing TBD.\n",
1748                                card->index);
1749                         return 1;
1750                 }
1751         }
1752         *scq->next = *tbd;
1753         index = (int)(scq->next - scq->base);
1754         scq->skb[index] = skb;
1755         XPRINTK("nicstar%d: sending skb at 0x%p (pos %d).\n",
1756                 card->index, skb, index);
1757         XPRINTK("nicstar%d: TBD written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%p.\n",
1758                 card->index, le32_to_cpu(tbd->word_1), le32_to_cpu(tbd->word_2),
1759                 le32_to_cpu(tbd->word_3), le32_to_cpu(tbd->word_4),
1760                 scq->next);
1761         if (scq->next == scq->last)
1762                 scq->next = scq->base;
1763         else
1764                 scq->next++;
1765
1766         vc->tbd_count++;
1767         if (scq->num_entries == VBR_SCQ_NUM_ENTRIES) {
1768                 scq->tbd_count++;
1769                 scq_is_vbr = 1;
1770         } else
1771                 scq_is_vbr = 0;
1772
1773         if (vc->tbd_count >= MAX_TBD_PER_VC
1774             || scq->tbd_count >= MAX_TBD_PER_SCQ) {
1775                 int has_run = 0;
1776
1777                 while (scq->tail == scq->next) {
1778                         if (in_interrupt()) {
1779                                 data = scq_virt_to_bus(scq, scq->next);
1780                                 ns_write_sram(card, scq->scd, &data, 1);
1781                                 spin_unlock_irqrestore(&scq->lock, flags);
1782                                 printk("nicstar%d: Error pushing TSR.\n",
1783                                        card->index);
1784                                 return 0;
1785                         }
1786
1787                         scq->full = 1;
1788                         if (has_run++)
1789                                 break;
1790                         wait_event_interruptible_lock_irq_timeout(scq->scqfull_waitq,
1791                                                                   scq->tail != scq->next,
1792                                                                   scq->lock,
1793                                                                   SCQFULL_TIMEOUT);
1794                 }
1795
1796                 if (!scq->full) {
1797                         tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
1798                         if (scq_is_vbr)
1799                                 scdi = NS_TSR_SCDISVBR;
1800                         else
1801                                 scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
1802                         scqi = scq->next - scq->base;
1803                         tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
1804                         tsr.word_3 = 0x00000000;
1805                         tsr.word_4 = 0x00000000;
1806
1807                         *scq->next = tsr;
1808                         index = (int)scqi;
1809                         scq->skb[index] = NULL;
1810                         XPRINTK
1811                             ("nicstar%d: TSR written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%p.\n",
1812                              card->index, le32_to_cpu(tsr.word_1),
1813                              le32_to_cpu(tsr.word_2), le32_to_cpu(tsr.word_3),
1814                              le32_to_cpu(tsr.word_4), scq->next);
1815                         if (scq->next == scq->last)
1816                                 scq->next = scq->base;
1817                         else
1818                                 scq->next++;
1819                         vc->tbd_count = 0;
1820                         scq->tbd_count = 0;
1821                 } else
1822                         PRINTK("nicstar%d: Timeout pushing TSR.\n",
1823                                card->index);
1824         }
1825         data = scq_virt_to_bus(scq, scq->next);
1826         ns_write_sram(card, scq->scd, &data, 1);
1827
1828         spin_unlock_irqrestore(&scq->lock, flags);
1829
1830         return 0;
1831 }
1832
1833 static void process_tsq(ns_dev * card)
1834 {
1835         u32 scdi;
1836         scq_info *scq;
1837         ns_tsi *previous = NULL, *one_ahead, *two_ahead;
1838         int serviced_entries;   /* flag indicating at least on entry was serviced */
1839
1840         serviced_entries = 0;
1841
1842         if (card->tsq.next == card->tsq.last)
1843                 one_ahead = card->tsq.base;
1844         else
1845                 one_ahead = card->tsq.next + 1;
1846
1847         if (one_ahead == card->tsq.last)
1848                 two_ahead = card->tsq.base;
1849         else
1850                 two_ahead = one_ahead + 1;
1851
1852         while (!ns_tsi_isempty(card->tsq.next) || !ns_tsi_isempty(one_ahead) ||
1853                !ns_tsi_isempty(two_ahead))
1854                 /* At most two empty, as stated in the 77201 errata */
1855         {
1856                 serviced_entries = 1;
1857
1858                 /* Skip the one or two possible empty entries */
1859                 while (ns_tsi_isempty(card->tsq.next)) {
1860                         if (card->tsq.next == card->tsq.last)
1861                                 card->tsq.next = card->tsq.base;
1862                         else
1863                                 card->tsq.next++;
1864                 }
1865
1866                 if (!ns_tsi_tmrof(card->tsq.next)) {
1867                         scdi = ns_tsi_getscdindex(card->tsq.next);
1868                         if (scdi == NS_TSI_SCDISVBR)
1869                                 scq = card->scq0;
1870                         else {
1871                                 if (card->scd2vc[scdi] == NULL) {
1872                                         printk
1873                                             ("nicstar%d: could not find VC from SCD index.\n",
1874                                              card->index);
1875                                         ns_tsi_init(card->tsq.next);
1876                                         return;
1877                                 }
1878                                 scq = card->scd2vc[scdi]->scq;
1879                         }
1880                         drain_scq(card, scq, ns_tsi_getscqpos(card->tsq.next));
1881                         scq->full = 0;
1882                         wake_up_interruptible(&(scq->scqfull_waitq));
1883                 }
1884
1885                 ns_tsi_init(card->tsq.next);
1886                 previous = card->tsq.next;
1887                 if (card->tsq.next == card->tsq.last)
1888                         card->tsq.next = card->tsq.base;
1889                 else
1890                         card->tsq.next++;
1891
1892                 if (card->tsq.next == card->tsq.last)
1893                         one_ahead = card->tsq.base;
1894                 else
1895                         one_ahead = card->tsq.next + 1;
1896
1897                 if (one_ahead == card->tsq.last)
1898                         two_ahead = card->tsq.base;
1899                 else
1900                         two_ahead = one_ahead + 1;
1901         }
1902
1903         if (serviced_entries)
1904                 writel(PTR_DIFF(previous, card->tsq.base),
1905                        card->membase + TSQH);
1906 }
1907
1908 static void drain_scq(ns_dev * card, scq_info * scq, int pos)
1909 {
1910         struct atm_vcc *vcc;
1911         struct sk_buff *skb;
1912         int i;
1913         unsigned long flags;
1914
1915         XPRINTK("nicstar%d: drain_scq() called, scq at 0x%p, pos %d.\n",
1916                 card->index, scq, pos);
1917         if (pos >= scq->num_entries) {
1918                 printk("nicstar%d: Bad index on drain_scq().\n", card->index);
1919                 return;
1920         }
1921
1922         spin_lock_irqsave(&scq->lock, flags);
1923         i = (int)(scq->tail - scq->base);
1924         if (++i == scq->num_entries)
1925                 i = 0;
1926         while (i != pos) {
1927                 skb = scq->skb[i];
1928                 XPRINTK("nicstar%d: freeing skb at 0x%p (index %d).\n",
1929                         card->index, skb, i);
1930                 if (skb != NULL) {
1931                         dma_unmap_single(&card->pcidev->dev,
1932                                          NS_PRV_DMA(skb),
1933                                          skb->len,
1934                                          DMA_TO_DEVICE);
1935                         vcc = ATM_SKB(skb)->vcc;
1936                         if (vcc && vcc->pop != NULL) {
1937                                 vcc->pop(vcc, skb);
1938                         } else {
1939                                 dev_kfree_skb_irq(skb);
1940                         }
1941                         scq->skb[i] = NULL;
1942                 }
1943                 if (++i == scq->num_entries)
1944                         i = 0;
1945         }
1946         scq->tail = scq->base + pos;
1947         spin_unlock_irqrestore(&scq->lock, flags);
1948 }
1949
1950 static void process_rsq(ns_dev * card)
1951 {
1952         ns_rsqe *previous;
1953
1954         if (!ns_rsqe_valid(card->rsq.next))
1955                 return;
1956         do {
1957                 dequeue_rx(card, card->rsq.next);
1958                 ns_rsqe_init(card->rsq.next);
1959                 previous = card->rsq.next;
1960                 if (card->rsq.next == card->rsq.last)
1961                         card->rsq.next = card->rsq.base;
1962                 else
1963                         card->rsq.next++;
1964         } while (ns_rsqe_valid(card->rsq.next));
1965         writel(PTR_DIFF(previous, card->rsq.base), card->membase + RSQH);
1966 }
1967
1968 static void dequeue_rx(ns_dev * card, ns_rsqe * rsqe)
1969 {
1970         u32 vpi, vci;
1971         vc_map *vc;
1972         struct sk_buff *iovb;
1973         struct iovec *iov;
1974         struct atm_vcc *vcc;
1975         struct sk_buff *skb;
1976         unsigned short aal5_len;
1977         int len;
1978         u32 stat;
1979         u32 id;
1980
1981         stat = readl(card->membase + STAT);
1982         card->sbfqc = ns_stat_sfbqc_get(stat);
1983         card->lbfqc = ns_stat_lfbqc_get(stat);
1984
1985         id = le32_to_cpu(rsqe->buffer_handle);
1986         skb = idr_remove(&card->idr, id);
1987         if (!skb) {
1988                 RXPRINTK(KERN_ERR
1989                          "nicstar%d: skb not found!\n", card->index);
1990                 return;
1991         }
1992         dma_sync_single_for_cpu(&card->pcidev->dev,
1993                                 NS_PRV_DMA(skb),
1994                                 (NS_PRV_BUFTYPE(skb) == BUF_SM
1995                                  ? NS_SMSKBSIZE : NS_LGSKBSIZE),
1996                                 DMA_FROM_DEVICE);
1997         dma_unmap_single(&card->pcidev->dev,
1998                          NS_PRV_DMA(skb),
1999                          (NS_PRV_BUFTYPE(skb) == BUF_SM
2000                           ? NS_SMSKBSIZE : NS_LGSKBSIZE),
2001                          DMA_FROM_DEVICE);
2002         vpi = ns_rsqe_vpi(rsqe);
2003         vci = ns_rsqe_vci(rsqe);
2004         if (vpi >= 1UL << card->vpibits || vci >= 1UL << card->vcibits) {
2005                 printk("nicstar%d: SDU received for out-of-range vc %d.%d.\n",
2006                        card->index, vpi, vci);
2007                 recycle_rx_buf(card, skb);
2008                 return;
2009         }
2010
2011         vc = &(card->vcmap[vpi << card->vcibits | vci]);
2012         if (!vc->rx) {
2013                 RXPRINTK("nicstar%d: SDU received on non-rx vc %d.%d.\n",
2014                          card->index, vpi, vci);
2015                 recycle_rx_buf(card, skb);
2016                 return;
2017         }
2018
2019         vcc = vc->rx_vcc;
2020
2021         if (vcc->qos.aal == ATM_AAL0) {
2022                 struct sk_buff *sb;
2023                 unsigned char *cell;
2024                 int i;
2025
2026                 cell = skb->data;
2027                 for (i = ns_rsqe_cellcount(rsqe); i; i--) {
2028                         sb = dev_alloc_skb(NS_SMSKBSIZE);
2029                         if (!sb) {
2030                                 printk
2031                                     ("nicstar%d: Can't allocate buffers for aal0.\n",
2032                                      card->index);
2033                                 atomic_add(i, &vcc->stats->rx_drop);
2034                                 break;
2035                         }
2036                         if (!atm_charge(vcc, sb->truesize)) {
2037                                 RXPRINTK
2038                                     ("nicstar%d: atm_charge() dropped aal0 packets.\n",
2039                                      card->index);
2040                                 atomic_add(i - 1, &vcc->stats->rx_drop);        /* already increased by 1 */
2041                                 dev_kfree_skb_any(sb);
2042                                 break;
2043                         }
2044                         /* Rebuild the header */
2045                         *((u32 *) sb->data) = le32_to_cpu(rsqe->word_1) << 4 |
2046                             (ns_rsqe_clp(rsqe) ? 0x00000001 : 0x00000000);
2047                         if (i == 1 && ns_rsqe_eopdu(rsqe))
2048                                 *((u32 *) sb->data) |= 0x00000002;
2049                         skb_put(sb, NS_AAL0_HEADER);
2050                         memcpy(skb_tail_pointer(sb), cell, ATM_CELL_PAYLOAD);
2051                         skb_put(sb, ATM_CELL_PAYLOAD);
2052                         ATM_SKB(sb)->vcc = vcc;
2053                         __net_timestamp(sb);
2054                         vcc->push(vcc, sb);
2055                         atomic_inc(&vcc->stats->rx);
2056                         cell += ATM_CELL_PAYLOAD;
2057                 }
2058
2059                 recycle_rx_buf(card, skb);
2060                 return;
2061         }
2062
2063         /* To reach this point, the AAL layer can only be AAL5 */
2064
2065         if ((iovb = vc->rx_iov) == NULL) {
2066                 iovb = skb_dequeue(&(card->iovpool.queue));
2067                 if (iovb == NULL) {     /* No buffers in the queue */
2068                         iovb = alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC);
2069                         if (iovb == NULL) {
2070                                 printk("nicstar%d: Out of iovec buffers.\n",
2071                                        card->index);
2072                                 atomic_inc(&vcc->stats->rx_drop);
2073                                 recycle_rx_buf(card, skb);
2074                                 return;
2075                         }
2076                         NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2077                 } else if (--card->iovpool.count < card->iovnr.min) {
2078                         struct sk_buff *new_iovb;
2079                         if ((new_iovb =
2080                              alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC)) != NULL) {
2081                                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2082                                 skb_queue_tail(&card->iovpool.queue, new_iovb);
2083                                 card->iovpool.count++;
2084                         }
2085                 }
2086                 vc->rx_iov = iovb;
2087                 NS_PRV_IOVCNT(iovb) = 0;
2088                 iovb->len = 0;
2089                 iovb->data = iovb->head;
2090                 skb_reset_tail_pointer(iovb);
2091                 /* IMPORTANT: a pointer to the sk_buff containing the small or large
2092                    buffer is stored as iovec base, NOT a pointer to the
2093                    small or large buffer itself. */
2094         } else if (NS_PRV_IOVCNT(iovb) >= NS_MAX_IOVECS) {
2095                 printk("nicstar%d: received too big AAL5 SDU.\n", card->index);
2096                 atomic_inc(&vcc->stats->rx_err);
2097                 recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2098                                       NS_MAX_IOVECS);
2099                 NS_PRV_IOVCNT(iovb) = 0;
2100                 iovb->len = 0;
2101                 iovb->data = iovb->head;
2102                 skb_reset_tail_pointer(iovb);
2103         }
2104         iov = &((struct iovec *)iovb->data)[NS_PRV_IOVCNT(iovb)++];
2105         iov->iov_base = (void *)skb;
2106         iov->iov_len = ns_rsqe_cellcount(rsqe) * 48;
2107         iovb->len += iov->iov_len;
2108
2109 #ifdef EXTRA_DEBUG
2110         if (NS_PRV_IOVCNT(iovb) == 1) {
2111                 if (NS_PRV_BUFTYPE(skb) != BUF_SM) {
2112                         printk
2113                             ("nicstar%d: Expected a small buffer, and this is not one.\n",
2114                              card->index);
2115                         which_list(card, skb);
2116                         atomic_inc(&vcc->stats->rx_err);
2117                         recycle_rx_buf(card, skb);
2118                         vc->rx_iov = NULL;
2119                         recycle_iov_buf(card, iovb);
2120                         return;
2121                 }
2122         } else {                /* NS_PRV_IOVCNT(iovb) >= 2 */
2123
2124                 if (NS_PRV_BUFTYPE(skb) != BUF_LG) {
2125                         printk
2126                             ("nicstar%d: Expected a large buffer, and this is not one.\n",
2127                              card->index);
2128                         which_list(card, skb);
2129                         atomic_inc(&vcc->stats->rx_err);
2130                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2131                                               NS_PRV_IOVCNT(iovb));
2132                         vc->rx_iov = NULL;
2133                         recycle_iov_buf(card, iovb);
2134                         return;
2135                 }
2136         }
2137 #endif /* EXTRA_DEBUG */
2138
2139         if (ns_rsqe_eopdu(rsqe)) {
2140                 /* This works correctly regardless of the endianness of the host */
2141                 unsigned char *L1L2 = (unsigned char *)
2142                                                 (skb->data + iov->iov_len - 6);
2143                 aal5_len = L1L2[0] << 8 | L1L2[1];
2144                 len = (aal5_len == 0x0000) ? 0x10000 : aal5_len;
2145                 if (ns_rsqe_crcerr(rsqe) ||
2146                     len + 8 > iovb->len || len + (47 + 8) < iovb->len) {
2147                         printk("nicstar%d: AAL5 CRC error", card->index);
2148                         if (len + 8 > iovb->len || len + (47 + 8) < iovb->len)
2149                                 printk(" - PDU size mismatch.\n");
2150                         else
2151                                 printk(".\n");
2152                         atomic_inc(&vcc->stats->rx_err);
2153                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2154                                               NS_PRV_IOVCNT(iovb));
2155                         vc->rx_iov = NULL;
2156                         recycle_iov_buf(card, iovb);
2157                         return;
2158                 }
2159
2160                 /* By this point we (hopefully) have a complete SDU without errors. */
2161
2162                 if (NS_PRV_IOVCNT(iovb) == 1) { /* Just a small buffer */
2163                         /* skb points to a small buffer */
2164                         if (!atm_charge(vcc, skb->truesize)) {
2165                                 push_rxbufs(card, skb);
2166                                 atomic_inc(&vcc->stats->rx_drop);
2167                         } else {
2168                                 skb_put(skb, len);
2169                                 dequeue_sm_buf(card, skb);
2170                                 ATM_SKB(skb)->vcc = vcc;
2171                                 __net_timestamp(skb);
2172                                 vcc->push(vcc, skb);
2173                                 atomic_inc(&vcc->stats->rx);
2174                         }
2175                 } else if (NS_PRV_IOVCNT(iovb) == 2) {  /* One small plus one large buffer */
2176                         struct sk_buff *sb;
2177
2178                         sb = (struct sk_buff *)(iov - 1)->iov_base;
2179                         /* skb points to a large buffer */
2180
2181                         if (len <= NS_SMBUFSIZE) {
2182                                 if (!atm_charge(vcc, sb->truesize)) {
2183                                         push_rxbufs(card, sb);
2184                                         atomic_inc(&vcc->stats->rx_drop);
2185                                 } else {
2186                                         skb_put(sb, len);
2187                                         dequeue_sm_buf(card, sb);
2188                                         ATM_SKB(sb)->vcc = vcc;
2189                                         __net_timestamp(sb);
2190                                         vcc->push(vcc, sb);
2191                                         atomic_inc(&vcc->stats->rx);
2192                                 }
2193
2194                                 push_rxbufs(card, skb);
2195
2196                         } else {        /* len > NS_SMBUFSIZE, the usual case */
2197
2198                                 if (!atm_charge(vcc, skb->truesize)) {
2199                                         push_rxbufs(card, skb);
2200                                         atomic_inc(&vcc->stats->rx_drop);
2201                                 } else {
2202                                         dequeue_lg_buf(card, skb);
2203                                         skb_push(skb, NS_SMBUFSIZE);
2204                                         skb_copy_from_linear_data(sb, skb->data,
2205                                                                   NS_SMBUFSIZE);
2206                                         skb_put(skb, len - NS_SMBUFSIZE);
2207                                         ATM_SKB(skb)->vcc = vcc;
2208                                         __net_timestamp(skb);
2209                                         vcc->push(vcc, skb);
2210                                         atomic_inc(&vcc->stats->rx);
2211                                 }
2212
2213                                 push_rxbufs(card, sb);
2214
2215                         }
2216
2217                 } else {        /* Must push a huge buffer */
2218
2219                         struct sk_buff *hb, *sb, *lb;
2220                         int remaining, tocopy;
2221                         int j;
2222
2223                         hb = skb_dequeue(&(card->hbpool.queue));
2224                         if (hb == NULL) {       /* No buffers in the queue */
2225
2226                                 hb = dev_alloc_skb(NS_HBUFSIZE);
2227                                 if (hb == NULL) {
2228                                         printk
2229                                             ("nicstar%d: Out of huge buffers.\n",
2230                                              card->index);
2231                                         atomic_inc(&vcc->stats->rx_drop);
2232                                         recycle_iovec_rx_bufs(card,
2233                                                               (struct iovec *)
2234                                                               iovb->data,
2235                                                               NS_PRV_IOVCNT(iovb));
2236                                         vc->rx_iov = NULL;
2237                                         recycle_iov_buf(card, iovb);
2238                                         return;
2239                                 } else if (card->hbpool.count < card->hbnr.min) {
2240                                         struct sk_buff *new_hb;
2241                                         if ((new_hb =
2242                                              dev_alloc_skb(NS_HBUFSIZE)) !=
2243                                             NULL) {
2244                                                 skb_queue_tail(&card->hbpool.
2245                                                                queue, new_hb);
2246                                                 card->hbpool.count++;
2247                                         }
2248                                 }
2249                                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
2250                         } else if (--card->hbpool.count < card->hbnr.min) {
2251                                 struct sk_buff *new_hb;
2252                                 if ((new_hb =
2253                                      dev_alloc_skb(NS_HBUFSIZE)) != NULL) {
2254                                         NS_PRV_BUFTYPE(new_hb) = BUF_NONE;
2255                                         skb_queue_tail(&card->hbpool.queue,
2256                                                        new_hb);
2257                                         card->hbpool.count++;
2258                                 }
2259                                 if (card->hbpool.count < card->hbnr.min) {
2260                                         if ((new_hb =
2261                                              dev_alloc_skb(NS_HBUFSIZE)) !=
2262                                             NULL) {
2263                                                 NS_PRV_BUFTYPE(new_hb) =
2264                                                     BUF_NONE;
2265                                                 skb_queue_tail(&card->hbpool.
2266                                                                queue, new_hb);
2267                                                 card->hbpool.count++;
2268                                         }
2269                                 }
2270                         }
2271
2272                         iov = (struct iovec *)iovb->data;
2273
2274                         if (!atm_charge(vcc, hb->truesize)) {
2275                                 recycle_iovec_rx_bufs(card, iov,
2276                                                       NS_PRV_IOVCNT(iovb));
2277                                 if (card->hbpool.count < card->hbnr.max) {
2278                                         skb_queue_tail(&card->hbpool.queue, hb);
2279                                         card->hbpool.count++;
2280                                 } else
2281                                         dev_kfree_skb_any(hb);
2282                                 atomic_inc(&vcc->stats->rx_drop);
2283                         } else {
2284                                 /* Copy the small buffer to the huge buffer */
2285                                 sb = (struct sk_buff *)iov->iov_base;
2286                                 skb_copy_from_linear_data(sb, hb->data,
2287                                                           iov->iov_len);
2288                                 skb_put(hb, iov->iov_len);
2289                                 remaining = len - iov->iov_len;
2290                                 iov++;
2291                                 /* Free the small buffer */
2292                                 push_rxbufs(card, sb);
2293
2294                                 /* Copy all large buffers to the huge buffer and free them */
2295                                 for (j = 1; j < NS_PRV_IOVCNT(iovb); j++) {
2296                                         lb = (struct sk_buff *)iov->iov_base;
2297                                         tocopy =
2298                                             min_t(int, remaining, iov->iov_len);
2299                                         skb_copy_from_linear_data(lb,
2300                                                                   skb_tail_pointer
2301                                                                   (hb), tocopy);
2302                                         skb_put(hb, tocopy);
2303                                         iov++;
2304                                         remaining -= tocopy;
2305                                         push_rxbufs(card, lb);
2306                                 }
2307 #ifdef EXTRA_DEBUG
2308                                 if (remaining != 0 || hb->len != len)
2309                                         printk
2310                                             ("nicstar%d: Huge buffer len mismatch.\n",
2311                                              card->index);
2312 #endif /* EXTRA_DEBUG */
2313                                 ATM_SKB(hb)->vcc = vcc;
2314                                 __net_timestamp(hb);
2315                                 vcc->push(vcc, hb);
2316                                 atomic_inc(&vcc->stats->rx);
2317                         }
2318                 }
2319
2320                 vc->rx_iov = NULL;
2321                 recycle_iov_buf(card, iovb);
2322         }
2323
2324 }
2325
2326 static void recycle_rx_buf(ns_dev * card, struct sk_buff *skb)
2327 {
2328         if (unlikely(NS_PRV_BUFTYPE(skb) == BUF_NONE)) {
2329                 printk("nicstar%d: What kind of rx buffer is this?\n",
2330                        card->index);
2331                 dev_kfree_skb_any(skb);
2332         } else
2333                 push_rxbufs(card, skb);
2334 }
2335
2336 static void recycle_iovec_rx_bufs(ns_dev * card, struct iovec *iov, int count)
2337 {
2338         while (count-- > 0)
2339                 recycle_rx_buf(card, (struct sk_buff *)(iov++)->iov_base);
2340 }
2341
2342 static void recycle_iov_buf(ns_dev * card, struct sk_buff *iovb)
2343 {
2344         if (card->iovpool.count < card->iovnr.max) {
2345                 skb_queue_tail(&card->iovpool.queue, iovb);
2346                 card->iovpool.count++;
2347         } else
2348                 dev_kfree_skb_any(iovb);
2349 }
2350
2351 static void dequeue_sm_buf(ns_dev * card, struct sk_buff *sb)
2352 {
2353         skb_unlink(sb, &card->sbpool.queue);
2354         if (card->sbfqc < card->sbnr.init) {
2355                 struct sk_buff *new_sb;
2356                 if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL) {
2357                         NS_PRV_BUFTYPE(new_sb) = BUF_SM;
2358                         skb_queue_tail(&card->sbpool.queue, new_sb);
2359                         skb_reserve(new_sb, NS_AAL0_HEADER);
2360                         push_rxbufs(card, new_sb);
2361                 }
2362         }
2363         if (card->sbfqc < card->sbnr.init)
2364         {
2365                 struct sk_buff *new_sb;
2366                 if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL) {
2367                         NS_PRV_BUFTYPE(new_sb) = BUF_SM;
2368                         skb_queue_tail(&card->sbpool.queue, new_sb);
2369                         skb_reserve(new_sb, NS_AAL0_HEADER);
2370                         push_rxbufs(card, new_sb);
2371                 }
2372         }
2373 }
2374
2375 static void dequeue_lg_buf(ns_dev * card, struct sk_buff *lb)
2376 {
2377         skb_unlink(lb, &card->lbpool.queue);
2378         if (card->lbfqc < card->lbnr.init) {
2379                 struct sk_buff *new_lb;
2380                 if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL) {
2381                         NS_PRV_BUFTYPE(new_lb) = BUF_LG;
2382                         skb_queue_tail(&card->lbpool.queue, new_lb);
2383                         skb_reserve(new_lb, NS_SMBUFSIZE);
2384                         push_rxbufs(card, new_lb);
2385                 }
2386         }
2387         if (card->lbfqc < card->lbnr.init)
2388         {
2389                 struct sk_buff *new_lb;
2390                 if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL) {
2391                         NS_PRV_BUFTYPE(new_lb) = BUF_LG;
2392                         skb_queue_tail(&card->lbpool.queue, new_lb);
2393                         skb_reserve(new_lb, NS_SMBUFSIZE);
2394                         push_rxbufs(card, new_lb);
2395                 }
2396         }
2397 }
2398
2399 static int ns_proc_read(struct atm_dev *dev, loff_t * pos, char *page)
2400 {
2401         u32 stat;
2402         ns_dev *card;
2403         int left;
2404
2405         left = (int)*pos;
2406         card = (ns_dev *) dev->dev_data;
2407         stat = readl(card->membase + STAT);
2408         if (!left--)
2409                 return sprintf(page, "Pool   count    min   init    max \n");
2410         if (!left--)
2411                 return sprintf(page, "Small  %5d  %5d  %5d  %5d \n",
2412                                ns_stat_sfbqc_get(stat), card->sbnr.min,
2413                                card->sbnr.init, card->sbnr.max);
2414         if (!left--)
2415                 return sprintf(page, "Large  %5d  %5d  %5d  %5d \n",
2416                                ns_stat_lfbqc_get(stat), card->lbnr.min,
2417                                card->lbnr.init, card->lbnr.max);
2418         if (!left--)
2419                 return sprintf(page, "Huge   %5d  %5d  %5d  %5d \n",
2420                                card->hbpool.count, card->hbnr.min,
2421                                card->hbnr.init, card->hbnr.max);
2422         if (!left--)
2423                 return sprintf(page, "Iovec  %5d  %5d  %5d  %5d \n",
2424                                card->iovpool.count, card->iovnr.min,
2425                                card->iovnr.init, card->iovnr.max);
2426         if (!left--) {
2427                 int retval;
2428                 retval =
2429                     sprintf(page, "Interrupt counter: %u \n", card->intcnt);
2430                 card->intcnt = 0;
2431                 return retval;
2432         }
2433 #if 0
2434         /* Dump 25.6 Mbps PHY registers */
2435         /* Now there's a 25.6 Mbps PHY driver this code isn't needed. I left it
2436            here just in case it's needed for debugging. */
2437         if (card->max_pcr == ATM_25_PCR && !left--) {
2438                 u32 phy_regs[4];
2439                 u32 i;
2440
2441                 for (i = 0; i < 4; i++) {
2442                         while (CMD_BUSY(card)) ;
2443                         writel(NS_CMD_READ_UTILITY | 0x00000200 | i,
2444                                card->membase + CMD);
2445                         while (CMD_BUSY(card)) ;
2446                         phy_regs[i] = readl(card->membase + DR0) & 0x000000FF;
2447                 }
2448
2449                 return sprintf(page, "PHY regs: 0x%02X 0x%02X 0x%02X 0x%02X \n",
2450                                phy_regs[0], phy_regs[1], phy_regs[2],
2451                                phy_regs[3]);
2452         }
2453 #endif /* 0 - Dump 25.6 Mbps PHY registers */
2454 #if 0
2455         /* Dump TST */
2456         if (left-- < NS_TST_NUM_ENTRIES) {
2457                 if (card->tste2vc[left + 1] == NULL)
2458                         return sprintf(page, "%5d - VBR/UBR \n", left + 1);
2459                 else
2460                         return sprintf(page, "%5d - %d %d \n", left + 1,
2461                                        card->tste2vc[left + 1]->tx_vcc->vpi,
2462                                        card->tste2vc[left + 1]->tx_vcc->vci);
2463         }
2464 #endif /* 0 */
2465         return 0;
2466 }
2467
2468 static int ns_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg)
2469 {
2470         ns_dev *card;
2471         pool_levels pl;
2472         long btype;
2473         unsigned long flags;
2474
2475         card = dev->dev_data;
2476         switch (cmd) {
2477         case NS_GETPSTAT:
2478                 if (get_user
2479                     (pl.buftype, &((pool_levels __user *) arg)->buftype))
2480                         return -EFAULT;
2481                 switch (pl.buftype) {
2482                 case NS_BUFTYPE_SMALL:
2483                         pl.count =
2484                             ns_stat_sfbqc_get(readl(card->membase + STAT));
2485                         pl.level.min = card->sbnr.min;
2486                         pl.level.init = card->sbnr.init;
2487                         pl.level.max = card->sbnr.max;
2488                         break;
2489
2490                 case NS_BUFTYPE_LARGE:
2491                         pl.count =
2492                             ns_stat_lfbqc_get(readl(card->membase + STAT));
2493                         pl.level.min = card->lbnr.min;
2494                         pl.level.init = card->lbnr.init;
2495                         pl.level.max = card->lbnr.max;
2496                         break;
2497
2498                 case NS_BUFTYPE_HUGE:
2499                         pl.count = card->hbpool.count;
2500                         pl.level.min = card->hbnr.min;
2501                         pl.level.init = card->hbnr.init;
2502                         pl.level.max = card->hbnr.max;
2503                         break;
2504
2505                 case NS_BUFTYPE_IOVEC:
2506                         pl.count = card->iovpool.count;
2507                         pl.level.min = card->iovnr.min;
2508                         pl.level.init = card->iovnr.init;
2509                         pl.level.max = card->iovnr.max;
2510                         break;
2511
2512                 default:
2513                         return -ENOIOCTLCMD;
2514
2515                 }
2516                 if (!copy_to_user((pool_levels __user *) arg, &pl, sizeof(pl)))
2517                         return (sizeof(pl));
2518                 else
2519                         return -EFAULT;
2520
2521         case NS_SETBUFLEV:
2522                 if (!capable(CAP_NET_ADMIN))
2523                         return -EPERM;
2524                 if (copy_from_user(&pl, (pool_levels __user *) arg, sizeof(pl)))
2525                         return -EFAULT;
2526                 if (pl.level.min >= pl.level.init
2527                     || pl.level.init >= pl.level.max)
2528                         return -EINVAL;
2529                 if (pl.level.min == 0)
2530                         return -EINVAL;
2531                 switch (pl.buftype) {
2532                 case NS_BUFTYPE_SMALL:
2533                         if (pl.level.max > TOP_SB)
2534                                 return -EINVAL;
2535                         card->sbnr.min = pl.level.min;
2536                         card->sbnr.init = pl.level.init;
2537                         card->sbnr.max = pl.level.max;
2538                         break;
2539
2540                 case NS_BUFTYPE_LARGE:
2541                         if (pl.level.max > TOP_LB)
2542                                 return -EINVAL;
2543                         card->lbnr.min = pl.level.min;
2544                         card->lbnr.init = pl.level.init;
2545                         card->lbnr.max = pl.level.max;
2546                         break;
2547
2548                 case NS_BUFTYPE_HUGE:
2549                         if (pl.level.max > TOP_HB)
2550                                 return -EINVAL;
2551                         card->hbnr.min = pl.level.min;
2552                         card->hbnr.init = pl.level.init;
2553                         card->hbnr.max = pl.level.max;
2554                         break;
2555
2556                 case NS_BUFTYPE_IOVEC:
2557                         if (pl.level.max > TOP_IOVB)
2558                                 return -EINVAL;
2559                         card->iovnr.min = pl.level.min;
2560                         card->iovnr.init = pl.level.init;
2561                         card->iovnr.max = pl.level.max;
2562                         break;
2563
2564                 default:
2565                         return -EINVAL;
2566
2567                 }
2568                 return 0;
2569
2570         case NS_ADJBUFLEV:
2571                 if (!capable(CAP_NET_ADMIN))
2572                         return -EPERM;
2573                 btype = (long)arg;      /* a long is the same size as a pointer or bigger */
2574                 switch (btype) {
2575                 case NS_BUFTYPE_SMALL:
2576                         while (card->sbfqc < card->sbnr.init) {
2577                                 struct sk_buff *sb;
2578
2579                                 sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
2580                                 if (sb == NULL)
2581                                         return -ENOMEM;
2582                                 NS_PRV_BUFTYPE(sb) = BUF_SM;
2583                                 skb_queue_tail(&card->sbpool.queue, sb);
2584                                 skb_reserve(sb, NS_AAL0_HEADER);
2585                                 push_rxbufs(card, sb);
2586                         }
2587                         break;
2588
2589                 case NS_BUFTYPE_LARGE:
2590                         while (card->lbfqc < card->lbnr.init) {
2591                                 struct sk_buff *lb;
2592
2593                                 lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
2594                                 if (lb == NULL)
2595                                         return -ENOMEM;
2596                                 NS_PRV_BUFTYPE(lb) = BUF_LG;
2597                                 skb_queue_tail(&card->lbpool.queue, lb);
2598                                 skb_reserve(lb, NS_SMBUFSIZE);
2599                                 push_rxbufs(card, lb);
2600                         }
2601                         break;
2602
2603                 case NS_BUFTYPE_HUGE:
2604                         while (card->hbpool.count > card->hbnr.init) {
2605                                 struct sk_buff *hb;
2606
2607                                 spin_lock_irqsave(&card->int_lock, flags);
2608                                 hb = skb_dequeue(&card->hbpool.queue);
2609                                 card->hbpool.count--;
2610                                 spin_unlock_irqrestore(&card->int_lock, flags);
2611                                 if (hb == NULL)
2612                                         printk
2613                                             ("nicstar%d: huge buffer count inconsistent.\n",
2614                                              card->index);
2615                                 else
2616                                         dev_kfree_skb_any(hb);
2617
2618                         }
2619                         while (card->hbpool.count < card->hbnr.init) {
2620                                 struct sk_buff *hb;
2621
2622                                 hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
2623                                 if (hb == NULL)
2624                                         return -ENOMEM;
2625                                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
2626                                 spin_lock_irqsave(&card->int_lock, flags);
2627                                 skb_queue_tail(&card->hbpool.queue, hb);
2628                                 card->hbpool.count++;
2629                                 spin_unlock_irqrestore(&card->int_lock, flags);
2630                         }
2631                         break;
2632
2633                 case NS_BUFTYPE_IOVEC:
2634                         while (card->iovpool.count > card->iovnr.init) {
2635                                 struct sk_buff *iovb;
2636
2637                                 spin_lock_irqsave(&card->int_lock, flags);
2638                                 iovb = skb_dequeue(&card->iovpool.queue);
2639                                 card->iovpool.count--;
2640                                 spin_unlock_irqrestore(&card->int_lock, flags);
2641                                 if (iovb == NULL)
2642                                         printk
2643                                             ("nicstar%d: iovec buffer count inconsistent.\n",
2644                                              card->index);
2645                                 else
2646                                         dev_kfree_skb_any(iovb);
2647
2648                         }
2649                         while (card->iovpool.count < card->iovnr.init) {
2650                                 struct sk_buff *iovb;
2651
2652                                 iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
2653                                 if (iovb == NULL)
2654                                         return -ENOMEM;
2655                                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2656                                 spin_lock_irqsave(&card->int_lock, flags);
2657                                 skb_queue_tail(&card->iovpool.queue, iovb);
2658                                 card->iovpool.count++;
2659                                 spin_unlock_irqrestore(&card->int_lock, flags);
2660                         }
2661                         break;
2662
2663                 default:
2664                         return -EINVAL;
2665
2666                 }
2667                 return 0;
2668
2669         default:
2670                 if (dev->phy && dev->phy->ioctl) {
2671                         return dev->phy->ioctl(dev, cmd, arg);
2672                 } else {
2673                         printk("nicstar%d: %s == NULL \n", card->index,
2674                                dev->phy ? "dev->phy->ioctl" : "dev->phy");
2675                         return -ENOIOCTLCMD;
2676                 }
2677         }
2678 }
2679
2680 #ifdef EXTRA_DEBUG
2681 static void which_list(ns_dev * card, struct sk_buff *skb)
2682 {
2683         printk("skb buf_type: 0x%08x\n", NS_PRV_BUFTYPE(skb));
2684 }
2685 #endif /* EXTRA_DEBUG */
2686
2687 static void ns_poll(struct timer_list *unused)
2688 {
2689         int i;
2690         ns_dev *card;
2691         unsigned long flags;
2692         u32 stat_r, stat_w;
2693
2694         PRINTK("nicstar: Entering ns_poll().\n");
2695         for (i = 0; i < num_cards; i++) {
2696                 card = cards[i];
2697                 if (!spin_trylock_irqsave(&card->int_lock, flags)) {
2698                         /* Probably it isn't worth spinning */
2699                         continue;
2700                 }
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);