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 ns_send_bh(struct atm_vcc *vcc, struct sk_buff *skb);
 134 static int push_scqe(ns_dev * card, vc_map * vc, scq_info * scq, ns_scqe * tbd,
 135                      struct sk_buff *skb, bool may_sleep);
 136 static void process_tsq(ns_dev * card);
 137 static void drain_scq(ns_dev * card, scq_info * scq, int pos);
 138 static void process_rsq(ns_dev * card);
 139 static void dequeue_rx(ns_dev * card, ns_rsqe * rsqe);
 140 static void recycle_rx_buf(ns_dev * card, struct sk_buff *skb);
 141 static void recycle_iovec_rx_bufs(ns_dev * card, struct iovec *iov, int count);
 142 static void recycle_iov_buf(ns_dev * card, struct sk_buff *iovb);
 143 static void dequeue_sm_buf(ns_dev * card, struct sk_buff *sb);
 144 static void dequeue_lg_buf(ns_dev * card, struct sk_buff *lb);
 145 static int ns_proc_read(struct atm_dev *dev, loff_t * pos, char *page);
 146 static int ns_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg);
 147 #ifdef EXTRA_DEBUG
 148 static void which_list(ns_dev * card, struct sk_buff *skb);
 149 #endif
 150 static void ns_poll(struct timer_list *unused);
 151 static void ns_phy_put(struct atm_dev *dev, unsigned char value,
 152                        unsigned long addr);
 153 static unsigned char ns_phy_get(struct atm_dev *dev, unsigned long addr);
 154
 155 /* Global variables */
 156
 157 static struct ns_dev *cards[NS_MAX_CARDS];
 158 static unsigned num_cards;
 159 static const struct atmdev_ops atm_ops = {
 160         .open = ns_open,
 161         .close = ns_close,
 162         .ioctl = ns_ioctl,
 163         .send = ns_send,
 164         .send_bh = ns_send_bh,
 165         .phy_put = ns_phy_put,
 166         .phy_get = ns_phy_get,
 167         .proc_read = ns_proc_read,
 168         .owner = THIS_MODULE,
 169 };
 170
 171 static struct timer_list ns_timer;
 172 static char *mac[NS_MAX_CARDS];
 173 module_param_array(mac, charp, NULL, 0);
 174 MODULE_LICENSE("GPL");
 175
 176 /* Functions */
 177
 178 static int nicstar_init_one(struct pci_dev *pcidev,
 179                             const struct pci_device_id *ent)
 180 {
 181         static int index = -1;
 182         unsigned int error;
 183
 184         index++;
 185         cards[index] = NULL;
 186
 187         error = ns_init_card(index, pcidev);
 188         if (error) {
 189                 cards[index--] = NULL;  /* don't increment index */
 190                 goto err_out;
 191         }
 192
 193         return 0;
 194 err_out:
 195         return -ENODEV;
 196 }
 197
 198 static void nicstar_remove_one(struct pci_dev *pcidev)
 199 {
 200         int i, j;
 201         ns_dev *card = pci_get_drvdata(pcidev);
 202         struct sk_buff *hb;
 203         struct sk_buff *iovb;
 204         struct sk_buff *lb;
 205         struct sk_buff *sb;
 206
 207         i = card->index;
 208
 209         if (cards[i] == NULL)
 210                 return;
 211
 212         if (card->atmdev->phy && card->atmdev->phy->stop)
 213                 card->atmdev->phy->stop(card->atmdev);
 214
 215         /* Stop everything */
 216         writel(0x00000000, card->membase + CFG);
 217
 218         /* De-register device */
 219         atm_dev_deregister(card->atmdev);
 220
 221         /* Disable PCI device */
 222         pci_disable_device(pcidev);
 223
 224         /* Free up resources */
 225         j = 0;
 226         PRINTK("nicstar%d: freeing %d huge buffers.\n", i, card->hbpool.count);
 227         while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL) {
 228                 dev_kfree_skb_any(hb);
 229                 j++;
 230         }
 231         PRINTK("nicstar%d: %d huge buffers freed.\n", i, j);
 232         j = 0;
 233         PRINTK("nicstar%d: freeing %d iovec buffers.\n", i,
 234                card->iovpool.count);
 235         while ((iovb = skb_dequeue(&card->iovpool.queue)) != NULL) {
 236                 dev_kfree_skb_any(iovb);
 237                 j++;
 238         }
 239         PRINTK("nicstar%d: %d iovec buffers freed.\n", i, j);
 240         while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
 241                 dev_kfree_skb_any(lb);
 242         while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
 243                 dev_kfree_skb_any(sb);
 244         free_scq(card, card->scq0, NULL);
 245         for (j = 0; j < NS_FRSCD_NUM; j++) {
 246                 if (card->scd2vc[j] != NULL)
 247                         free_scq(card, card->scd2vc[j]->scq, card->scd2vc[j]->tx_vcc);
 248         }
 249         idr_destroy(&card->idr);
 250         dma_free_coherent(&card->pcidev->dev, NS_RSQSIZE + NS_RSQ_ALIGNMENT,
 251                           card->rsq.org, card->rsq.dma);
 252         dma_free_coherent(&card->pcidev->dev, NS_TSQSIZE + NS_TSQ_ALIGNMENT,
 253                           card->tsq.org, card->tsq.dma);
 254         free_irq(card->pcidev->irq, card);
 255         iounmap(card->membase);
 256         kfree(card);
 257 }
 258
 259 static const struct pci_device_id nicstar_pci_tbl[] = {
 260         { PCI_VDEVICE(IDT, PCI_DEVICE_ID_IDT_IDT77201), 0 },
 261         {0,}                    /* terminate list */
 262 };
 263
 264 MODULE_DEVICE_TABLE(pci, nicstar_pci_tbl);
 265
 266 static struct pci_driver nicstar_driver = {
 267         .name = "nicstar",
 268         .id_table = nicstar_pci_tbl,
 269         .probe = nicstar_init_one,
 270         .remove = nicstar_remove_one,
 271 };
 272
 273 static int __init nicstar_init(void)
 274 {
 275         unsigned error = 0;     /* Initialized to remove compile warning */
 276
 277         XPRINTK("nicstar: nicstar_init() called.\n");
 278
 279         error = pci_register_driver(&nicstar_driver);
 280
 281         TXPRINTK("nicstar: TX debug enabled.\n");
 282         RXPRINTK("nicstar: RX debug enabled.\n");
 283         PRINTK("nicstar: General debug enabled.\n");
 284 #ifdef PHY_LOOPBACK
 285         printk("nicstar: using PHY loopback.\n");
 286 #endif /* PHY_LOOPBACK */
 287         XPRINTK("nicstar: nicstar_init() returned.\n");
 288
 289         if (!error) {
 290                 timer_setup(&ns_timer, ns_poll, 0);
 291                 ns_timer.expires = jiffies + NS_POLL_PERIOD;
 292                 add_timer(&ns_timer);
 293         }
 294
 295         return error;
 296 }
 297
 298 static void __exit nicstar_cleanup(void)
 299 {
 300         XPRINTK("nicstar: nicstar_cleanup() called.\n");
 301
 302         del_timer_sync(&ns_timer);
 303
 304         pci_unregister_driver(&nicstar_driver);
 305
 306         XPRINTK("nicstar: nicstar_cleanup() returned.\n");
 307 }
 308
 309 static u32 ns_read_sram(ns_dev * card, u32 sram_address)
 310 {
 311         unsigned long flags;
 312         u32 data;
 313         sram_address <<= 2;
 314         sram_address &= 0x0007FFFC;     /* address must be dword aligned */
 315         sram_address |= 0x50000000;     /* SRAM read command */
 316         spin_lock_irqsave(&card->res_lock, flags);
 317         while (CMD_BUSY(card)) ;
 318         writel(sram_address, card->membase + CMD);
 319         while (CMD_BUSY(card)) ;
 320         data = readl(card->membase + DR0);
 321         spin_unlock_irqrestore(&card->res_lock, flags);
 322         return data;
 323 }
 324
 325 static void ns_write_sram(ns_dev * card, u32 sram_address, u32 * value,
 326                           int count)
 327 {
 328         unsigned long flags;
 329         int i, c;
 330         count--;                /* count range now is 0..3 instead of 1..4 */
 331         c = count;
 332         c <<= 2;                /* to use increments of 4 */
 333         spin_lock_irqsave(&card->res_lock, flags);
 334         while (CMD_BUSY(card)) ;
 335         for (i = 0; i <= c; i += 4)
 336                 writel(*(value++), card->membase + i);
 337         /* Note: DR# registers are the first 4 dwords in nicstar's memspace,
 338            so card->membase + DR0 == card->membase */
 339         sram_address <<= 2;
 340         sram_address &= 0x0007FFFC;
 341         sram_address |= (0x40000000 | count);
 342         writel(sram_address, card->membase + CMD);
 343         spin_unlock_irqrestore(&card->res_lock, flags);
 344 }
 345
 346 static int ns_init_card(int i, struct pci_dev *pcidev)
 347 {
 348         int j;
 349         struct ns_dev *card = NULL;
 350         unsigned char pci_latency;
 351         unsigned error;
 352         u32 data;
 353         u32 u32d[4];
 354         u32 ns_cfg_rctsize;
 355         int bcount;
 356         unsigned long membase;
 357
 358         error = 0;
 359
 360         if (pci_enable_device(pcidev)) {
 361                 printk("nicstar%d: can't enable PCI device\n", i);
 362                 error = 2;
 363                 ns_init_card_error(card, error);
 364                 return error;
 365         }
 366         if (dma_set_mask_and_coherent(&pcidev->dev, DMA_BIT_MASK(32)) != 0) {
 367                 printk(KERN_WARNING
 368                        "nicstar%d: No suitable DMA available.\n", i);
 369                 error = 2;
 370                 ns_init_card_error(card, error);
 371                 return error;
 372         }
 373
 374         card = kmalloc(sizeof(*card), GFP_KERNEL);
 375         if (!card) {
 376                 printk
 377                     ("nicstar%d: can't allocate memory for device structure.\n",
 378                      i);
 379                 error = 2;
 380                 ns_init_card_error(card, error);
 381                 return error;
 382         }
 383         cards[i] = card;
 384         spin_lock_init(&card->int_lock);
 385         spin_lock_init(&card->res_lock);
 386
 387         pci_set_drvdata(pcidev, card);
 388
 389         card->index = i;
 390         card->atmdev = NULL;
 391         card->pcidev = pcidev;
 392         membase = pci_resource_start(pcidev, 1);
 393         card->membase = ioremap(membase, NS_IOREMAP_SIZE);
 394         if (!card->membase) {
 395                 printk("nicstar%d: can't ioremap() membase.\n", i);
 396                 error = 3;
 397                 ns_init_card_error(card, error);
 398                 return error;
 399         }
 400         PRINTK("nicstar%d: membase at 0x%p.\n", i, card->membase);
 401
 402         pci_set_master(pcidev);
 403
 404         if (pci_read_config_byte(pcidev, PCI_LATENCY_TIMER, &pci_latency) != 0) {
 405                 printk("nicstar%d: can't read PCI latency timer.\n", i);
 406                 error = 6;
 407                 ns_init_card_error(card, error);
 408                 return error;
 409         }
 410 #ifdef NS_PCI_LATENCY
 411         if (pci_latency < NS_PCI_LATENCY) {
 412                 PRINTK("nicstar%d: setting PCI latency timer to %d.\n", i,
 413                        NS_PCI_LATENCY);
 414                 for (j = 1; j < 4; j++) {
 415                         if (pci_write_config_byte
 416                             (pcidev, PCI_LATENCY_TIMER, NS_PCI_LATENCY) != 0)
 417                                 break;
 418                 }
 419                 if (j == 4) {
 420                         printk
 421                             ("nicstar%d: can't set PCI latency timer to %d.\n",
 422                              i, NS_PCI_LATENCY);
 423                         error = 7;
 424                         ns_init_card_error(card, error);
 425                         return error;
 426                 }
 427         }
 428 #endif /* NS_PCI_LATENCY */
 429
 430         /* Clear timer overflow */
 431         data = readl(card->membase + STAT);
 432         if (data & NS_STAT_TMROF)
 433                 writel(NS_STAT_TMROF, card->membase + STAT);
 434
 435         /* Software reset */
 436         writel(NS_CFG_SWRST, card->membase + CFG);
 437         NS_DELAY;
 438         writel(0x00000000, card->membase + CFG);
 439
 440         /* PHY reset */
 441         writel(0x00000008, card->membase + GP);
 442         NS_DELAY;
 443         writel(0x00000001, card->membase + GP);
 444         NS_DELAY;
 445         while (CMD_BUSY(card)) ;
 446         writel(NS_CMD_WRITE_UTILITY | 0x00000100, card->membase + CMD); /* Sync UTOPIA with SAR clock */
 447         NS_DELAY;
 448
 449         /* Detect PHY type */
 450         while (CMD_BUSY(card)) ;
 451         writel(NS_CMD_READ_UTILITY | 0x00000200, card->membase + CMD);
 452         while (CMD_BUSY(card)) ;
 453         data = readl(card->membase + DR0);
 454         switch (data) {
 455         case 0x00000009:
 456                 printk("nicstar%d: PHY seems to be 25 Mbps.\n", i);
 457                 card->max_pcr = ATM_25_PCR;
 458                 while (CMD_BUSY(card)) ;
 459                 writel(0x00000008, card->membase + DR0);
 460                 writel(NS_CMD_WRITE_UTILITY | 0x00000200, card->membase + CMD);
 461                 /* Clear an eventual pending interrupt */
 462                 writel(NS_STAT_SFBQF, card->membase + STAT);
 463 #ifdef PHY_LOOPBACK
 464                 while (CMD_BUSY(card)) ;
 465                 writel(0x00000022, card->membase + DR0);
 466                 writel(NS_CMD_WRITE_UTILITY | 0x00000202, card->membase + CMD);
 467 #endif /* PHY_LOOPBACK */
 468                 break;
 469         case 0x00000030:
 470         case 0x00000031:
 471                 printk("nicstar%d: PHY seems to be 155 Mbps.\n", i);
 472                 card->max_pcr = ATM_OC3_PCR;
 473 #ifdef PHY_LOOPBACK
 474                 while (CMD_BUSY(card)) ;
 475                 writel(0x00000002, card->membase + DR0);
 476                 writel(NS_CMD_WRITE_UTILITY | 0x00000205, card->membase + CMD);
 477 #endif /* PHY_LOOPBACK */
 478                 break;
 479         default:
 480                 printk("nicstar%d: unknown PHY type (0x%08X).\n", i, data);
 481                 error = 8;
 482                 ns_init_card_error(card, error);
 483                 return error;
 484         }
 485         writel(0x00000000, card->membase + GP);
 486
 487         /* Determine SRAM size */
 488         data = 0x76543210;
 489         ns_write_sram(card, 0x1C003, &data, 1);
 490         data = 0x89ABCDEF;
 491         ns_write_sram(card, 0x14003, &data, 1);
 492         if (ns_read_sram(card, 0x14003) == 0x89ABCDEF &&
 493             ns_read_sram(card, 0x1C003) == 0x76543210)
 494                 card->sram_size = 128;
 495         else
 496                 card->sram_size = 32;
 497         PRINTK("nicstar%d: %dK x 32bit SRAM size.\n", i, card->sram_size);
 498
 499         card->rct_size = NS_MAX_RCTSIZE;
 500
 501 #if (NS_MAX_RCTSIZE == 4096)
 502         if (card->sram_size == 128)
 503                 printk
 504                     ("nicstar%d: limiting maximum VCI. See NS_MAX_RCTSIZE in nicstar.h\n",
 505                      i);
 506 #elif (NS_MAX_RCTSIZE == 16384)
 507         if (card->sram_size == 32) {
 508                 printk
 509                     ("nicstar%d: wasting memory. See NS_MAX_RCTSIZE in nicstar.h\n",
 510                      i);
 511                 card->rct_size = 4096;
 512         }
 513 #else
 514 #error NS_MAX_RCTSIZE must be either 4096 or 16384 in nicstar.c
 515 #endif
 516
 517         card->vpibits = NS_VPIBITS;
 518         if (card->rct_size == 4096)
 519                 card->vcibits = 12 - NS_VPIBITS;
 520         else                    /* card->rct_size == 16384 */
 521                 card->vcibits = 14 - NS_VPIBITS;
 522
 523         /* Initialize the nicstar eeprom/eprom stuff, for the MAC addr */
 524         if (mac[i] == NULL)
 525                 nicstar_init_eprom(card->membase);
 526
 527         /* Set the VPI/VCI MSb mask to zero so we can receive OAM cells */
 528         writel(0x00000000, card->membase + VPM);
 529
 530         card->intcnt = 0;
 531         if (request_irq
 532             (pcidev->irq, &ns_irq_handler, IRQF_SHARED, "nicstar", card) != 0) {
 533                 pr_err("nicstar%d: can't allocate IRQ %d.\n", i, pcidev->irq);
 534                 error = 9;
 535                 ns_init_card_error(card, error);
 536                 return error;
 537         }
 538
 539         /* Initialize TSQ */
 540         card->tsq.org = dma_alloc_coherent(&card->pcidev->dev,
 541                                            NS_TSQSIZE + NS_TSQ_ALIGNMENT,
 542                                            &card->tsq.dma, GFP_KERNEL);
 543         if (card->tsq.org == NULL) {
 544                 printk("nicstar%d: can't allocate TSQ.\n", i);
 545                 error = 10;
 546                 ns_init_card_error(card, error);
 547                 return error;
 548         }
 549         card->tsq.base = PTR_ALIGN(card->tsq.org, NS_TSQ_ALIGNMENT);
 550         card->tsq.next = card->tsq.base;
 551         card->tsq.last = card->tsq.base + (NS_TSQ_NUM_ENTRIES - 1);
 552         for (j = 0; j < NS_TSQ_NUM_ENTRIES; j++)
 553                 ns_tsi_init(card->tsq.base + j);
 554         writel(0x00000000, card->membase + TSQH);
 555         writel(ALIGN(card->tsq.dma, NS_TSQ_ALIGNMENT), card->membase + TSQB);
 556         PRINTK("nicstar%d: TSQ base at 0x%p.\n", i, card->tsq.base);
 557
 558         /* Initialize RSQ */
 559         card->rsq.org = dma_alloc_coherent(&card->pcidev->dev,
 560                                            NS_RSQSIZE + NS_RSQ_ALIGNMENT,
 561                                            &card->rsq.dma, GFP_KERNEL);
 562         if (card->rsq.org == NULL) {
 563                 printk("nicstar%d: can't allocate RSQ.\n", i);
 564                 error = 11;
 565                 ns_init_card_error(card, error);
 566                 return error;
 567         }
 568         card->rsq.base = PTR_ALIGN(card->rsq.org, NS_RSQ_ALIGNMENT);
 569         card->rsq.next = card->rsq.base;
 570         card->rsq.last = card->rsq.base + (NS_RSQ_NUM_ENTRIES - 1);
 571         for (j = 0; j < NS_RSQ_NUM_ENTRIES; j++)
 572                 ns_rsqe_init(card->rsq.base + j);
 573         writel(0x00000000, card->membase + RSQH);
 574         writel(ALIGN(card->rsq.dma, NS_RSQ_ALIGNMENT), card->membase + RSQB);
 575         PRINTK("nicstar%d: RSQ base at 0x%p.\n", i, card->rsq.base);
 576
 577         /* Initialize SCQ0, the only VBR SCQ used */
 578         card->scq1 = NULL;
 579         card->scq2 = NULL;
 580         card->scq0 = get_scq(card, VBR_SCQSIZE, NS_VRSCD0);
 581         if (card->scq0 == NULL) {
 582                 printk("nicstar%d: can't get SCQ0.\n", i);
 583                 error = 12;
 584                 ns_init_card_error(card, error);
 585                 return error;
 586         }
 587         u32d[0] = scq_virt_to_bus(card->scq0, card->scq0->base);
 588         u32d[1] = (u32) 0x00000000;
 589         u32d[2] = (u32) 0xffffffff;
 590         u32d[3] = (u32) 0x00000000;
 591         ns_write_sram(card, NS_VRSCD0, u32d, 4);
 592         ns_write_sram(card, NS_VRSCD1, u32d, 4);        /* These last two won't be used */
 593         ns_write_sram(card, NS_VRSCD2, u32d, 4);        /* but are initialized, just in case... */
 594         card->scq0->scd = NS_VRSCD0;
 595         PRINTK("nicstar%d: VBR-SCQ0 base at 0x%p.\n", i, card->scq0->base);
 596
 597         /* Initialize TSTs */
 598         card->tst_addr = NS_TST0;
 599         card->tst_free_entries = NS_TST_NUM_ENTRIES;
 600         data = NS_TST_OPCODE_VARIABLE;
 601         for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
 602                 ns_write_sram(card, NS_TST0 + j, &data, 1);
 603         data = ns_tste_make(NS_TST_OPCODE_END, NS_TST0);
 604         ns_write_sram(card, NS_TST0 + NS_TST_NUM_ENTRIES, &data, 1);
 605         for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
 606                 ns_write_sram(card, NS_TST1 + j, &data, 1);
 607         data = ns_tste_make(NS_TST_OPCODE_END, NS_TST1);
 608         ns_write_sram(card, NS_TST1 + NS_TST_NUM_ENTRIES, &data, 1);
 609         for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
 610                 card->tste2vc[j] = NULL;
 611         writel(NS_TST0 << 2, card->membase + TSTB);
 612
 613         /* Initialize RCT. AAL type is set on opening the VC. */
 614 #ifdef RCQ_SUPPORT
 615         u32d[0] = NS_RCTE_RAWCELLINTEN;
 616 #else
 617         u32d[0] = 0x00000000;
 618 #endif /* RCQ_SUPPORT */
 619         u32d[1] = 0x00000000;
 620         u32d[2] = 0x00000000;
 621         u32d[3] = 0xFFFFFFFF;
 622         for (j = 0; j < card->rct_size; j++)
 623                 ns_write_sram(card, j * 4, u32d, 4);
 624
 625         memset(card->vcmap, 0, sizeof(card->vcmap));
 626
 627         for (j = 0; j < NS_FRSCD_NUM; j++)
 628                 card->scd2vc[j] = NULL;
 629
 630         /* Initialize buffer levels */
 631         card->sbnr.min = MIN_SB;
 632         card->sbnr.init = NUM_SB;
 633         card->sbnr.max = MAX_SB;
 634         card->lbnr.min = MIN_LB;
 635         card->lbnr.init = NUM_LB;
 636         card->lbnr.max = MAX_LB;
 637         card->iovnr.min = MIN_IOVB;
 638         card->iovnr.init = NUM_IOVB;
 639         card->iovnr.max = MAX_IOVB;
 640         card->hbnr.min = MIN_HB;
 641         card->hbnr.init = NUM_HB;
 642         card->hbnr.max = MAX_HB;
 643
 644         card->sm_handle = NULL;
 645         card->sm_addr = 0x00000000;
 646         card->lg_handle = NULL;
 647         card->lg_addr = 0x00000000;
 648
 649         card->efbie = 1;        /* To prevent push_rxbufs from enabling the interrupt */
 650
 651         idr_init(&card->idr);
 652
 653         /* Pre-allocate some huge buffers */
 654         skb_queue_head_init(&card->hbpool.queue);
 655         card->hbpool.count = 0;
 656         for (j = 0; j < NUM_HB; j++) {
 657                 struct sk_buff *hb;
 658                 hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
 659                 if (hb == NULL) {
 660                         printk
 661                             ("nicstar%d: can't allocate %dth of %d huge buffers.\n",
 662                              i, j, NUM_HB);
 663                         error = 13;
 664                         ns_init_card_error(card, error);
 665                         return error;
 666                 }
 667                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
 668                 skb_queue_tail(&card->hbpool.queue, hb);
 669                 card->hbpool.count++;
 670         }
 671
 672         /* Allocate large buffers */
 673         skb_queue_head_init(&card->lbpool.queue);
 674         card->lbpool.count = 0; /* Not used */
 675         for (j = 0; j < NUM_LB; j++) {
 676                 struct sk_buff *lb;
 677                 lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
 678                 if (lb == NULL) {
 679                         printk
 680                             ("nicstar%d: can't allocate %dth of %d large buffers.\n",
 681                              i, j, NUM_LB);
 682                         error = 14;
 683                         ns_init_card_error(card, error);
 684                         return error;
 685                 }
 686                 NS_PRV_BUFTYPE(lb) = BUF_LG;
 687                 skb_queue_tail(&card->lbpool.queue, lb);
 688                 skb_reserve(lb, NS_SMBUFSIZE);
 689                 push_rxbufs(card, lb);
 690                 /* Due to the implementation of push_rxbufs() this is 1, not 0 */
 691                 if (j == 1) {
 692                         card->rcbuf = lb;
 693                         card->rawcell = (struct ns_rcqe *) lb->data;
 694                         card->rawch = NS_PRV_DMA(lb);
 695                 }
 696         }
 697         /* Test for strange behaviour which leads to crashes */
 698         if ((bcount =
 699              ns_stat_lfbqc_get(readl(card->membase + STAT))) < card->lbnr.min) {
 700                 printk
 701                     ("nicstar%d: Strange... Just allocated %d large buffers and lfbqc = %d.\n",
 702                      i, j, bcount);
 703                 error = 14;
 704                 ns_init_card_error(card, error);
 705                 return error;
 706         }
 707
 708         /* Allocate small buffers */
 709         skb_queue_head_init(&card->sbpool.queue);
 710         card->sbpool.count = 0; /* Not used */
 711         for (j = 0; j < NUM_SB; j++) {
 712                 struct sk_buff *sb;
 713                 sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
 714                 if (sb == NULL) {
 715                         printk
 716                             ("nicstar%d: can't allocate %dth of %d small buffers.\n",
 717                              i, j, NUM_SB);
 718                         error = 15;
 719                         ns_init_card_error(card, error);
 720                         return error;
 721                 }
 722                 NS_PRV_BUFTYPE(sb) = BUF_SM;
 723                 skb_queue_tail(&card->sbpool.queue, sb);
 724                 skb_reserve(sb, NS_AAL0_HEADER);
 725                 push_rxbufs(card, sb);
 726         }
 727         /* Test for strange behaviour which leads to crashes */
 728         if ((bcount =
 729              ns_stat_sfbqc_get(readl(card->membase + STAT))) < card->sbnr.min) {
 730                 printk
 731                     ("nicstar%d: Strange... Just allocated %d small buffers and sfbqc = %d.\n",
 732                      i, j, bcount);
 733                 error = 15;
 734                 ns_init_card_error(card, error);
 735                 return error;
 736         }
 737
 738         /* Allocate iovec buffers */
 739         skb_queue_head_init(&card->iovpool.queue);
 740         card->iovpool.count = 0;
 741         for (j = 0; j < NUM_IOVB; j++) {
 742                 struct sk_buff *iovb;
 743                 iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
 744                 if (iovb == NULL) {
 745                         printk
 746                             ("nicstar%d: can't allocate %dth of %d iovec buffers.\n",
 747                              i, j, NUM_IOVB);
 748                         error = 16;
 749                         ns_init_card_error(card, error);
 750                         return error;
 751                 }
 752                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
 753                 skb_queue_tail(&card->iovpool.queue, iovb);
 754                 card->iovpool.count++;
 755         }
 756
 757         /* Configure NICStAR */
 758         if (card->rct_size == 4096)
 759                 ns_cfg_rctsize = NS_CFG_RCTSIZE_4096_ENTRIES;
 760         else                    /* (card->rct_size == 16384) */
 761                 ns_cfg_rctsize = NS_CFG_RCTSIZE_16384_ENTRIES;
 762
 763         card->efbie = 1;
 764
 765         /* Register device */
 766         card->atmdev = atm_dev_register("nicstar", &card->pcidev->dev, &atm_ops,
 767                                         -1, NULL);
 768         if (card->atmdev == NULL) {
 769                 printk("nicstar%d: can't register device.\n", i);
 770                 error = 17;
 771                 ns_init_card_error(card, error);
 772                 return error;
 773         }
 774
 775         if (mac[i] == NULL || !mac_pton(mac[i], card->atmdev->esi)) {
 776                 nicstar_read_eprom(card->membase, NICSTAR_EPROM_MAC_ADDR_OFFSET,
 777                                    card->atmdev->esi, 6);
 778                 if (ether_addr_equal(card->atmdev->esi, "\x00\x00\x00\x00\x00\x00")) {
 779                         nicstar_read_eprom(card->membase,
 780                                            NICSTAR_EPROM_MAC_ADDR_OFFSET_ALT,
 781                                            card->atmdev->esi, 6);
 782                 }
 783         }
 784
 785         printk("nicstar%d: MAC address %pM\n", i, card->atmdev->esi);
 786
 787         card->atmdev->dev_data = card;
 788         card->atmdev->ci_range.vpi_bits = card->vpibits;
 789         card->atmdev->ci_range.vci_bits = card->vcibits;
 790         card->atmdev->link_rate = card->max_pcr;
 791         card->atmdev->phy = NULL;
 792
 793 #ifdef CONFIG_ATM_NICSTAR_USE_SUNI
 794         if (card->max_pcr == ATM_OC3_PCR)
 795                 suni_init(card->atmdev);
 796 #endif /* CONFIG_ATM_NICSTAR_USE_SUNI */
 797
 798 #ifdef CONFIG_ATM_NICSTAR_USE_IDT77105
 799         if (card->max_pcr == ATM_25_PCR)
 800                 idt77105_init(card->atmdev);
 801 #endif /* CONFIG_ATM_NICSTAR_USE_IDT77105 */
 802
 803         if (card->atmdev->phy && card->atmdev->phy->start)
 804                 card->atmdev->phy->start(card->atmdev);
 805
 806         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 */
 807                NS_CFG_RSQAFIE | NS_CFG_TXEN | NS_CFG_TXIE | NS_CFG_TSQFIE_OPT | /* Only enabled if ENABLE_TSQFIE */
 808                NS_CFG_PHYIE, card->membase + CFG);
 809
 810         num_cards++;
 811
 812         return error;
 813 }
 814
 815 static void ns_init_card_error(ns_dev *card, int error)
 816 {
 817         if (error >= 17) {
 818                 writel(0x00000000, card->membase + CFG);
 819         }
 820         if (error >= 16) {
 821                 struct sk_buff *iovb;
 822                 while ((iovb = skb_dequeue(&card->iovpool.queue)) != NULL)
 823                         dev_kfree_skb_any(iovb);
 824         }
 825         if (error >= 15) {
 826                 struct sk_buff *sb;
 827                 while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
 828                         dev_kfree_skb_any(sb);
 829                 free_scq(card, card->scq0, NULL);
 830         }
 831         if (error >= 14) {
 832                 struct sk_buff *lb;
 833                 while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
 834                         dev_kfree_skb_any(lb);
 835         }
 836         if (error >= 13) {
 837                 struct sk_buff *hb;
 838                 while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL)
 839                         dev_kfree_skb_any(hb);
 840         }
 841         if (error >= 12) {
 842                 dma_free_coherent(&card->pcidev->dev, NS_RSQSIZE + NS_RSQ_ALIGNMENT,
 843                                 card->rsq.org, card->rsq.dma);
 844         }
 845         if (error >= 11) {
 846                 dma_free_coherent(&card->pcidev->dev, NS_TSQSIZE + NS_TSQ_ALIGNMENT,
 847                                 card->tsq.org, card->tsq.dma);
 848         }
 849         if (error >= 10) {
 850                 free_irq(card->pcidev->irq, card);
 851         }
 852         if (error >= 4) {
 853                 iounmap(card->membase);
 854         }
 855         if (error >= 3) {
 856                 pci_disable_device(card->pcidev);
 857                 kfree(card);
 858         }
 859 }
 860
 861 static scq_info *get_scq(ns_dev *card, int size, u32 scd)
 862 {
 863         scq_info *scq;
 864
 865         if (size != VBR_SCQSIZE && size != CBR_SCQSIZE)
 866                 return NULL;
 867
 868         scq = kmalloc(sizeof(*scq), GFP_KERNEL);
 869         if (!scq)
 870                 return NULL;
 871         scq->org = dma_alloc_coherent(&card->pcidev->dev,
 872                                       2 * size,  &scq->dma, GFP_KERNEL);
 873         if (!scq->org) {
 874                 kfree(scq);
 875                 return NULL;
 876         }
 877         scq->skb = kcalloc(size / NS_SCQE_SIZE, 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->tbd_count = 0;
 892         init_waitqueue_head(&scq->scqfull_waitq);
 893         scq->full = 0;
 894         spin_lock_init(&scq->lock);
 895
 896         return scq;
 897 }
 898
 899 /* For variable rate SCQ vcc must be NULL */
 900 static void free_scq(ns_dev *card, scq_info *scq, struct atm_vcc *vcc)
 901 {
 902         int i;
 903
 904         if (scq->num_entries == VBR_SCQ_NUM_ENTRIES)
 905                 for (i = 0; i < scq->num_entries; i++) {
 906                         if (scq->skb[i] != NULL) {
 907                                 vcc = ATM_SKB(scq->skb[i])->vcc;
 908                                 if (vcc->pop != NULL)
 909                                         vcc->pop(vcc, scq->skb[i]);
 910                                 else
 911                                         dev_kfree_skb_any(scq->skb[i]);
 912                         }
 913         } else {                /* vcc must be != NULL */
 914
 915                 if (vcc == NULL) {
 916                         printk
 917                             ("nicstar: free_scq() called with vcc == NULL for fixed rate scq.");
 918                         for (i = 0; i < scq->num_entries; i++)
 919                                 dev_kfree_skb_any(scq->skb[i]);
 920                 } else
 921                         for (i = 0; i < scq->num_entries; i++) {
 922                                 if (scq->skb[i] != NULL) {
 923                                         if (vcc->pop != NULL)
 924                                                 vcc->pop(vcc, scq->skb[i]);
 925                                         else
 926                                                 dev_kfree_skb_any(scq->skb[i]);
 927                                 }
 928                         }
 929         }
 930         kfree(scq->skb);
 931         dma_free_coherent(&card->pcidev->dev,
 932                           2 * (scq->num_entries == VBR_SCQ_NUM_ENTRIES ?
 933                                VBR_SCQSIZE : CBR_SCQSIZE),
 934                           scq->org, scq->dma);
 935         kfree(scq);
 936 }
 937
 938 /* The handles passed must be pointers to the sk_buff containing the small
 939    or large buffer(s) cast to u32. */
 940 static void push_rxbufs(ns_dev * card, struct sk_buff *skb)
 941 {
 942         struct sk_buff *handle1, *handle2;
 943         int id1, id2;
 944         u32 addr1, addr2;
 945         u32 stat;
 946         unsigned long flags;
 947
 948         /* *BARF* */
 949         handle2 = NULL;
 950         addr2 = 0;
 951         handle1 = skb;
 952         addr1 = dma_map_single(&card->pcidev->dev,
 953                                skb->data,
 954                                (NS_PRV_BUFTYPE(skb) == BUF_SM
 955                                 ? NS_SMSKBSIZE : NS_LGSKBSIZE),
 956                                DMA_TO_DEVICE);
 957         NS_PRV_DMA(skb) = addr1; /* save so we can unmap later */
 958
 959 #ifdef GENERAL_DEBUG
 960         if (!addr1)
 961                 printk("nicstar%d: push_rxbufs called with addr1 = 0.\n",
 962                        card->index);
 963 #endif /* GENERAL_DEBUG */
 964
 965         stat = readl(card->membase + STAT);
 966         card->sbfqc = ns_stat_sfbqc_get(stat);
 967         card->lbfqc = ns_stat_lfbqc_get(stat);
 968         if (NS_PRV_BUFTYPE(skb) == BUF_SM) {
 969                 if (!addr2) {
 970                         if (card->sm_addr) {
 971                                 addr2 = card->sm_addr;
 972                                 handle2 = card->sm_handle;
 973                                 card->sm_addr = 0x00000000;
 974                                 card->sm_handle = NULL;
 975                         } else {        /* (!sm_addr) */
 976
 977                                 card->sm_addr = addr1;
 978                                 card->sm_handle = handle1;
 979                         }
 980                 }
 981         } else {                /* buf_type == BUF_LG */
 982
 983                 if (!addr2) {
 984                         if (card->lg_addr) {
 985                                 addr2 = card->lg_addr;
 986                                 handle2 = card->lg_handle;
 987                                 card->lg_addr = 0x00000000;
 988                                 card->lg_handle = NULL;
 989                         } else {        /* (!lg_addr) */
 990
 991                                 card->lg_addr = addr1;
 992                                 card->lg_handle = handle1;
 993                         }
 994                 }
 995         }
 996
 997         if (addr2) {
 998                 if (NS_PRV_BUFTYPE(skb) == BUF_SM) {
 999                         if (card->sbfqc >= card->sbnr.max) {
1000                                 skb_unlink(handle1, &card->sbpool.queue);
1001                                 dev_kfree_skb_any(handle1);
1002                                 skb_unlink(handle2, &card->sbpool.queue);
1003                                 dev_kfree_skb_any(handle2);
1004                                 return;
1005                         } else
1006                                 card->sbfqc += 2;
1007                 } else {        /* (buf_type == BUF_LG) */
1008
1009                         if (card->lbfqc >= card->lbnr.max) {
1010                                 skb_unlink(handle1, &card->lbpool.queue);
1011                                 dev_kfree_skb_any(handle1);
1012                                 skb_unlink(handle2, &card->lbpool.queue);
1013                                 dev_kfree_skb_any(handle2);
1014                                 return;
1015                         } else
1016                                 card->lbfqc += 2;
1017                 }
1018
1019                 id1 = idr_alloc(&card->idr, handle1, 0, 0, GFP_ATOMIC);
1020                 if (id1 < 0)
1021                         goto out;
1022
1023                 id2 = idr_alloc(&card->idr, handle2, 0, 0, GFP_ATOMIC);
1024                 if (id2 < 0)
1025                         goto out;
1026
1027                 spin_lock_irqsave(&card->res_lock, flags);
1028                 while (CMD_BUSY(card)) ;
1029                 writel(addr2, card->membase + DR3);
1030                 writel(id2, card->membase + DR2);
1031                 writel(addr1, card->membase + DR1);
1032                 writel(id1, card->membase + DR0);
1033                 writel(NS_CMD_WRITE_FREEBUFQ | NS_PRV_BUFTYPE(skb),
1034                        card->membase + CMD);
1035                 spin_unlock_irqrestore(&card->res_lock, flags);
1036
1037                 XPRINTK("nicstar%d: Pushing %s buffers at 0x%x and 0x%x.\n",
1038                         card->index,
1039                         (NS_PRV_BUFTYPE(skb) == BUF_SM ? "small" : "large"),
1040                         addr1, addr2);
1041         }
1042
1043         if (!card->efbie && card->sbfqc >= card->sbnr.min &&
1044             card->lbfqc >= card->lbnr.min) {
1045                 card->efbie = 1;
1046                 writel((readl(card->membase + CFG) | NS_CFG_EFBIE),
1047                        card->membase + CFG);
1048         }
1049
1050 out:
1051         return;
1052 }
1053
1054 static irqreturn_t ns_irq_handler(int irq, void *dev_id)
1055 {
1056         u32 stat_r;
1057         ns_dev *card;
1058         struct atm_dev *dev;
1059         unsigned long flags;
1060
1061         card = (ns_dev *) dev_id;
1062         dev = card->atmdev;
1063         card->intcnt++;
1064
1065         PRINTK("nicstar%d: NICStAR generated an interrupt\n", card->index);
1066
1067         spin_lock_irqsave(&card->int_lock, flags);
1068
1069         stat_r = readl(card->membase + STAT);
1070
1071         /* Transmit Status Indicator has been written to T. S. Queue */
1072         if (stat_r & NS_STAT_TSIF) {
1073                 TXPRINTK("nicstar%d: TSI interrupt\n", card->index);
1074                 process_tsq(card);
1075                 writel(NS_STAT_TSIF, card->membase + STAT);
1076         }
1077
1078         /* Incomplete CS-PDU has been transmitted */
1079         if (stat_r & NS_STAT_TXICP) {
1080                 writel(NS_STAT_TXICP, card->membase + STAT);
1081                 TXPRINTK("nicstar%d: Incomplete CS-PDU transmitted.\n",
1082                          card->index);
1083         }
1084
1085         /* Transmit Status Queue 7/8 full */
1086         if (stat_r & NS_STAT_TSQF) {
1087                 writel(NS_STAT_TSQF, card->membase + STAT);
1088                 PRINTK("nicstar%d: TSQ full.\n", card->index);
1089                 process_tsq(card);
1090         }
1091
1092         /* Timer overflow */
1093         if (stat_r & NS_STAT_TMROF) {
1094                 writel(NS_STAT_TMROF, card->membase + STAT);
1095                 PRINTK("nicstar%d: Timer overflow.\n", card->index);
1096         }
1097
1098         /* PHY device interrupt signal active */
1099         if (stat_r & NS_STAT_PHYI) {
1100                 writel(NS_STAT_PHYI, card->membase + STAT);
1101                 PRINTK("nicstar%d: PHY interrupt.\n", card->index);
1102                 if (dev->phy && dev->phy->interrupt) {
1103                         dev->phy->interrupt(dev);
1104                 }
1105         }
1106
1107         /* Small Buffer Queue is full */
1108         if (stat_r & NS_STAT_SFBQF) {
1109                 writel(NS_STAT_SFBQF, card->membase + STAT);
1110                 printk("nicstar%d: Small free buffer queue is full.\n",
1111                        card->index);
1112         }
1113
1114         /* Large Buffer Queue is full */
1115         if (stat_r & NS_STAT_LFBQF) {
1116                 writel(NS_STAT_LFBQF, card->membase + STAT);
1117                 printk("nicstar%d: Large free buffer queue is full.\n",
1118                        card->index);
1119         }
1120
1121         /* Receive Status Queue is full */
1122         if (stat_r & NS_STAT_RSQF) {
1123                 writel(NS_STAT_RSQF, card->membase + STAT);
1124                 printk("nicstar%d: RSQ full.\n", card->index);
1125                 process_rsq(card);
1126         }
1127
1128         /* Complete CS-PDU received */
1129         if (stat_r & NS_STAT_EOPDU) {
1130                 RXPRINTK("nicstar%d: End of CS-PDU received.\n", card->index);
1131                 process_rsq(card);
1132                 writel(NS_STAT_EOPDU, card->membase + STAT);
1133         }
1134
1135         /* Raw cell received */
1136         if (stat_r & NS_STAT_RAWCF) {
1137                 writel(NS_STAT_RAWCF, card->membase + STAT);
1138 #ifndef RCQ_SUPPORT
1139                 printk("nicstar%d: Raw cell received and no support yet...\n",
1140                        card->index);
1141 #endif /* RCQ_SUPPORT */
1142                 /* NOTE: the following procedure may keep a raw cell pending until the
1143                    next interrupt. As this preliminary support is only meant to
1144                    avoid buffer leakage, this is not an issue. */
1145                 while (readl(card->membase + RAWCT) != card->rawch) {
1146
1147                         if (ns_rcqe_islast(card->rawcell)) {
1148                                 struct sk_buff *oldbuf;
1149
1150                                 oldbuf = card->rcbuf;
1151                                 card->rcbuf = idr_find(&card->idr,
1152                                                        ns_rcqe_nextbufhandle(card->rawcell));
1153                                 card->rawch = NS_PRV_DMA(card->rcbuf);
1154                                 card->rawcell = (struct ns_rcqe *)
1155                                                 card->rcbuf->data;
1156                                 recycle_rx_buf(card, oldbuf);
1157                         } else {
1158                                 card->rawch += NS_RCQE_SIZE;
1159                                 card->rawcell++;
1160                         }
1161                 }
1162         }
1163
1164         /* Small buffer queue is empty */
1165         if (stat_r & NS_STAT_SFBQE) {
1166                 int i;
1167                 struct sk_buff *sb;
1168
1169                 writel(NS_STAT_SFBQE, card->membase + STAT);
1170                 printk("nicstar%d: Small free buffer queue empty.\n",
1171                        card->index);
1172                 for (i = 0; i < card->sbnr.min; i++) {
1173                         sb = dev_alloc_skb(NS_SMSKBSIZE);
1174                         if (sb == NULL) {
1175                                 writel(readl(card->membase + CFG) &
1176                                        ~NS_CFG_EFBIE, card->membase + CFG);
1177                                 card->efbie = 0;
1178                                 break;
1179                         }
1180                         NS_PRV_BUFTYPE(sb) = BUF_SM;
1181                         skb_queue_tail(&card->sbpool.queue, sb);
1182                         skb_reserve(sb, NS_AAL0_HEADER);
1183                         push_rxbufs(card, sb);
1184                 }
1185                 card->sbfqc = i;
1186                 process_rsq(card);
1187         }
1188
1189         /* Large buffer queue empty */
1190         if (stat_r & NS_STAT_LFBQE) {
1191                 int i;
1192                 struct sk_buff *lb;
1193
1194                 writel(NS_STAT_LFBQE, card->membase + STAT);
1195                 printk("nicstar%d: Large free buffer queue empty.\n",
1196                        card->index);
1197                 for (i = 0; i < card->lbnr.min; i++) {
1198                         lb = dev_alloc_skb(NS_LGSKBSIZE);
1199                         if (lb == NULL) {
1200                                 writel(readl(card->membase + CFG) &
1201                                        ~NS_CFG_EFBIE, card->membase + CFG);
1202                                 card->efbie = 0;
1203                                 break;
1204                         }
1205                         NS_PRV_BUFTYPE(lb) = BUF_LG;
1206                         skb_queue_tail(&card->lbpool.queue, lb);
1207                         skb_reserve(lb, NS_SMBUFSIZE);
1208                         push_rxbufs(card, lb);
1209                 }
1210                 card->lbfqc = i;
1211                 process_rsq(card);
1212         }
1213
1214         /* Receive Status Queue is 7/8 full */
1215         if (stat_r & NS_STAT_RSQAF) {
1216                 writel(NS_STAT_RSQAF, card->membase + STAT);
1217                 RXPRINTK("nicstar%d: RSQ almost full.\n", card->index);
1218                 process_rsq(card);
1219         }
1220
1221         spin_unlock_irqrestore(&card->int_lock, flags);
1222         PRINTK("nicstar%d: end of interrupt service\n", card->index);
1223         return IRQ_HANDLED;
1224 }
1225
1226 static int ns_open(struct atm_vcc *vcc)
1227 {
1228         ns_dev *card;
1229         vc_map *vc;
1230         unsigned long tmpl, modl;
1231         int tcr, tcra;          /* target cell rate, and absolute value */
1232         int n = 0;              /* Number of entries in the TST. Initialized to remove
1233                                    the compiler warning. */
1234         u32 u32d[4];
1235         int frscdi = 0;         /* Index of the SCD. Initialized to remove the compiler
1236                                    warning. How I wish compilers were clever enough to
1237                                    tell which variables can truly be used
1238                                    uninitialized... */
1239         int inuse;              /* tx or rx vc already in use by another vcc */
1240         short vpi = vcc->vpi;
1241         int vci = vcc->vci;
1242
1243         card = (ns_dev *) vcc->dev->dev_data;
1244         PRINTK("nicstar%d: opening vpi.vci %d.%d \n", card->index, (int)vpi,
1245                vci);
1246         if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0) {
1247                 PRINTK("nicstar%d: unsupported AAL.\n", card->index);
1248                 return -EINVAL;
1249         }
1250
1251         vc = &(card->vcmap[vpi << card->vcibits | vci]);
1252         vcc->dev_data = vc;
1253
1254         inuse = 0;
1255         if (vcc->qos.txtp.traffic_class != ATM_NONE && vc->tx)
1256                 inuse = 1;
1257         if (vcc->qos.rxtp.traffic_class != ATM_NONE && vc->rx)
1258                 inuse += 2;
1259         if (inuse) {
1260                 printk("nicstar%d: %s vci already in use.\n", card->index,
1261                        inuse == 1 ? "tx" : inuse == 2 ? "rx" : "tx and rx");
1262                 return -EINVAL;
1263         }
1264
1265         set_bit(ATM_VF_ADDR, &vcc->flags);
1266
1267         /* NOTE: You are not allowed to modify an open connection's QOS. To change
1268            that, remove the ATM_VF_PARTIAL flag checking. There may be other changes
1269            needed to do that. */
1270         if (!test_bit(ATM_VF_PARTIAL, &vcc->flags)) {
1271                 scq_info *scq;
1272
1273                 set_bit(ATM_VF_PARTIAL, &vcc->flags);
1274                 if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1275                         /* Check requested cell rate and availability of SCD */
1276                         if (vcc->qos.txtp.max_pcr == 0 && vcc->qos.txtp.pcr == 0
1277                             && vcc->qos.txtp.min_pcr == 0) {
1278                                 PRINTK
1279                                     ("nicstar%d: trying to open a CBR vc with cell rate = 0 \n",
1280                                      card->index);
1281                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1282                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1283                                 return -EINVAL;
1284                         }
1285
1286                         tcr = atm_pcr_goal(&(vcc->qos.txtp));
1287                         tcra = tcr >= 0 ? tcr : -tcr;
1288
1289                         PRINTK("nicstar%d: target cell rate = %d.\n",
1290                                card->index, vcc->qos.txtp.max_pcr);
1291
1292                         tmpl =
1293                             (unsigned long)tcra *(unsigned long)
1294                             NS_TST_NUM_ENTRIES;
1295                         modl = tmpl % card->max_pcr;
1296
1297                         n = (int)(tmpl / card->max_pcr);
1298                         if (tcr > 0) {
1299                                 if (modl > 0)
1300                                         n++;
1301                         } else if (tcr == 0) {
1302                                 if ((n =
1303                                      (card->tst_free_entries -
1304                                       NS_TST_RESERVED)) <= 0) {
1305                                         PRINTK
1306                                             ("nicstar%d: no CBR bandwidth free.\n",
1307                                              card->index);
1308                                         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1309                                         clear_bit(ATM_VF_ADDR, &vcc->flags);
1310                                         return -EINVAL;
1311                                 }
1312                         }
1313
1314                         if (n == 0) {
1315                                 printk
1316                                     ("nicstar%d: selected bandwidth < granularity.\n",
1317                                      card->index);
1318                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1319                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1320                                 return -EINVAL;
1321                         }
1322
1323                         if (n > (card->tst_free_entries - NS_TST_RESERVED)) {
1324                                 PRINTK
1325                                     ("nicstar%d: not enough free CBR bandwidth.\n",
1326                                      card->index);
1327                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1328                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1329                                 return -EINVAL;
1330                         } else
1331                                 card->tst_free_entries -= n;
1332
1333                         XPRINTK("nicstar%d: writing %d tst entries.\n",
1334                                 card->index, n);
1335                         for (frscdi = 0; frscdi < NS_FRSCD_NUM; frscdi++) {
1336                                 if (card->scd2vc[frscdi] == NULL) {
1337                                         card->scd2vc[frscdi] = vc;
1338                                         break;
1339                                 }
1340                         }
1341                         if (frscdi == NS_FRSCD_NUM) {
1342                                 PRINTK
1343                                     ("nicstar%d: no SCD available for CBR channel.\n",
1344                                      card->index);
1345                                 card->tst_free_entries += n;
1346                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1347                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1348                                 return -EBUSY;
1349                         }
1350
1351                         vc->cbr_scd = NS_FRSCD + frscdi * NS_FRSCD_SIZE;
1352
1353                         scq = get_scq(card, CBR_SCQSIZE, vc->cbr_scd);
1354                         if (scq == NULL) {
1355                                 PRINTK("nicstar%d: can't get fixed rate SCQ.\n",
1356                                        card->index);
1357                                 card->scd2vc[frscdi] = NULL;
1358                                 card->tst_free_entries += n;
1359                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1360                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1361                                 return -ENOMEM;
1362                         }
1363                         vc->scq = scq;
1364                         u32d[0] = scq_virt_to_bus(scq, scq->base);
1365                         u32d[1] = (u32) 0x00000000;
1366                         u32d[2] = (u32) 0xffffffff;
1367                         u32d[3] = (u32) 0x00000000;
1368                         ns_write_sram(card, vc->cbr_scd, u32d, 4);
1369
1370                         fill_tst(card, n, vc);
1371                 } else if (vcc->qos.txtp.traffic_class == ATM_UBR) {
1372                         vc->cbr_scd = 0x00000000;
1373                         vc->scq = card->scq0;
1374                 }
1375
1376                 if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1377                         vc->tx = 1;
1378                         vc->tx_vcc = vcc;
1379                         vc->tbd_count = 0;
1380                 }
1381                 if (vcc->qos.rxtp.traffic_class != ATM_NONE) {
1382                         u32 status;
1383
1384                         vc->rx = 1;
1385                         vc->rx_vcc = vcc;
1386                         vc->rx_iov = NULL;
1387
1388                         /* Open the connection in hardware */
1389                         if (vcc->qos.aal == ATM_AAL5)
1390                                 status = NS_RCTE_AAL5 | NS_RCTE_CONNECTOPEN;
1391                         else    /* vcc->qos.aal == ATM_AAL0 */
1392                                 status = NS_RCTE_AAL0 | NS_RCTE_CONNECTOPEN;
1393 #ifdef RCQ_SUPPORT
1394                         status |= NS_RCTE_RAWCELLINTEN;
1395 #endif /* RCQ_SUPPORT */
1396                         ns_write_sram(card,
1397                                       NS_RCT +
1398                                       (vpi << card->vcibits | vci) *
1399                                       NS_RCT_ENTRY_SIZE, &status, 1);
1400                 }
1401
1402         }
1403
1404         set_bit(ATM_VF_READY, &vcc->flags);
1405         return 0;
1406 }
1407
1408 static void ns_close(struct atm_vcc *vcc)
1409 {
1410         vc_map *vc;
1411         ns_dev *card;
1412         u32 data;
1413         int i;
1414
1415         vc = vcc->dev_data;
1416         card = vcc->dev->dev_data;
1417         PRINTK("nicstar%d: closing vpi.vci %d.%d \n", card->index,
1418                (int)vcc->vpi, vcc->vci);
1419
1420         clear_bit(ATM_VF_READY, &vcc->flags);
1421
1422         if (vcc->qos.rxtp.traffic_class != ATM_NONE) {
1423                 u32 addr;
1424                 unsigned long flags;
1425
1426                 addr =
1427                     NS_RCT +
1428                     (vcc->vpi << card->vcibits | vcc->vci) * NS_RCT_ENTRY_SIZE;
1429                 spin_lock_irqsave(&card->res_lock, flags);
1430                 while (CMD_BUSY(card)) ;
1431                 writel(NS_CMD_CLOSE_CONNECTION | addr << 2,
1432                        card->membase + CMD);
1433                 spin_unlock_irqrestore(&card->res_lock, flags);
1434
1435                 vc->rx = 0;
1436                 if (vc->rx_iov != NULL) {
1437                         struct sk_buff *iovb;
1438                         u32 stat;
1439
1440                         stat = readl(card->membase + STAT);
1441                         card->sbfqc = ns_stat_sfbqc_get(stat);
1442                         card->lbfqc = ns_stat_lfbqc_get(stat);
1443
1444                         PRINTK
1445                             ("nicstar%d: closing a VC with pending rx buffers.\n",
1446                              card->index);
1447                         iovb = vc->rx_iov;
1448                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
1449                                               NS_PRV_IOVCNT(iovb));
1450                         NS_PRV_IOVCNT(iovb) = 0;
1451                         spin_lock_irqsave(&card->int_lock, flags);
1452                         recycle_iov_buf(card, iovb);
1453                         spin_unlock_irqrestore(&card->int_lock, flags);
1454                         vc->rx_iov = NULL;
1455                 }
1456         }
1457
1458         if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1459                 vc->tx = 0;
1460         }
1461
1462         if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1463                 unsigned long flags;
1464                 ns_scqe *scqep;
1465                 scq_info *scq;
1466
1467                 scq = vc->scq;
1468
1469                 for (;;) {
1470                         spin_lock_irqsave(&scq->lock, flags);
1471                         scqep = scq->next;
1472                         if (scqep == scq->base)
1473                                 scqep = scq->last;
1474                         else
1475                                 scqep--;
1476                         if (scqep == scq->tail) {
1477                                 spin_unlock_irqrestore(&scq->lock, flags);
1478                                 break;
1479                         }
1480                         /* If the last entry is not a TSR, place one in the SCQ in order to
1481                            be able to completely drain it and then close. */
1482                         if (!ns_scqe_is_tsr(scqep) && scq->tail != scq->next) {
1483                                 ns_scqe tsr;
1484                                 u32 scdi, scqi;
1485                                 u32 data;
1486                                 int index;
1487
1488                                 tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
1489                                 scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
1490                                 scqi = scq->next - scq->base;
1491                                 tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
1492                                 tsr.word_3 = 0x00000000;
1493                                 tsr.word_4 = 0x00000000;
1494                                 *scq->next = tsr;
1495                                 index = (int)scqi;
1496                                 scq->skb[index] = NULL;
1497                                 if (scq->next == scq->last)
1498                                         scq->next = scq->base;
1499                                 else
1500                                         scq->next++;
1501                                 data = scq_virt_to_bus(scq, scq->next);
1502                                 ns_write_sram(card, scq->scd, &data, 1);
1503                         }
1504                         spin_unlock_irqrestore(&scq->lock, flags);
1505                         schedule();
1506                 }
1507
1508                 /* Free all TST entries */
1509                 data = NS_TST_OPCODE_VARIABLE;
1510                 for (i = 0; i < NS_TST_NUM_ENTRIES; i++) {
1511                         if (card->tste2vc[i] == vc) {
1512                                 ns_write_sram(card, card->tst_addr + i, &data,
1513                                               1);
1514                                 card->tste2vc[i] = NULL;
1515                                 card->tst_free_entries++;
1516                         }
1517                 }
1518
1519                 card->scd2vc[(vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE] = NULL;
1520                 free_scq(card, vc->scq, vcc);
1521         }
1522
1523         /* remove all references to vcc before deleting it */
1524         if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1525                 unsigned long flags;
1526                 scq_info *scq = card->scq0;
1527
1528                 spin_lock_irqsave(&scq->lock, flags);
1529
1530                 for (i = 0; i < scq->num_entries; i++) {
1531                         if (scq->skb[i] && ATM_SKB(scq->skb[i])->vcc == vcc) {
1532                                 ATM_SKB(scq->skb[i])->vcc = NULL;
1533                                 atm_return(vcc, scq->skb[i]->truesize);
1534                                 PRINTK
1535                                     ("nicstar: deleted pending vcc mapping\n");
1536                         }
1537                 }
1538
1539                 spin_unlock_irqrestore(&scq->lock, flags);
1540         }
1541
1542         vcc->dev_data = NULL;
1543         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1544         clear_bit(ATM_VF_ADDR, &vcc->flags);
1545
1546 #ifdef RX_DEBUG
1547         {
1548                 u32 stat, cfg;
1549                 stat = readl(card->membase + STAT);
1550                 cfg = readl(card->membase + CFG);
1551                 printk("STAT = 0x%08X  CFG = 0x%08X  \n", stat, cfg);
1552                 printk
1553                     ("TSQ: base = 0x%p  next = 0x%p  last = 0x%p  TSQT = 0x%08X \n",
1554                      card->tsq.base, card->tsq.next,
1555                      card->tsq.last, readl(card->membase + TSQT));
1556                 printk
1557                     ("RSQ: base = 0x%p  next = 0x%p  last = 0x%p  RSQT = 0x%08X \n",
1558                      card->rsq.base, card->rsq.next,
1559                      card->rsq.last, readl(card->membase + RSQT));
1560                 printk("Empty free buffer queue interrupt %s \n",
1561                        card->efbie ? "enabled" : "disabled");
1562                 printk("SBCNT = %d  count = %d   LBCNT = %d count = %d \n",
1563                        ns_stat_sfbqc_get(stat), card->sbpool.count,
1564                        ns_stat_lfbqc_get(stat), card->lbpool.count);
1565                 printk("hbpool.count = %d  iovpool.count = %d \n",
1566                        card->hbpool.count, card->iovpool.count);
1567         }
1568 #endif /* RX_DEBUG */
1569 }
1570
1571 static void fill_tst(ns_dev * card, int n, vc_map * vc)
1572 {
1573         u32 new_tst;
1574         unsigned long cl;
1575         int e, r;
1576         u32 data;
1577
1578         /* It would be very complicated to keep the two TSTs synchronized while
1579            assuring that writes are only made to the inactive TST. So, for now I
1580            will use only one TST. If problems occur, I will change this again */
1581
1582         new_tst = card->tst_addr;
1583
1584         /* Fill procedure */
1585
1586         for (e = 0; e < NS_TST_NUM_ENTRIES; e++) {
1587                 if (card->tste2vc[e] == NULL)
1588                         break;
1589         }
1590         if (e == NS_TST_NUM_ENTRIES) {
1591                 printk("nicstar%d: No free TST entries found. \n", card->index);
1592                 return;
1593         }
1594
1595         r = n;
1596         cl = NS_TST_NUM_ENTRIES;
1597         data = ns_tste_make(NS_TST_OPCODE_FIXED, vc->cbr_scd);
1598
1599         while (r > 0) {
1600                 if (cl >= NS_TST_NUM_ENTRIES && card->tste2vc[e] == NULL) {
1601                         card->tste2vc[e] = vc;
1602                         ns_write_sram(card, new_tst + e, &data, 1);
1603                         cl -= NS_TST_NUM_ENTRIES;
1604                         r--;
1605                 }
1606
1607                 if (++e == NS_TST_NUM_ENTRIES) {
1608                         e = 0;
1609                 }
1610                 cl += n;
1611         }
1612
1613         /* End of fill procedure */
1614
1615         data = ns_tste_make(NS_TST_OPCODE_END, new_tst);
1616         ns_write_sram(card, new_tst + NS_TST_NUM_ENTRIES, &data, 1);
1617         ns_write_sram(card, card->tst_addr + NS_TST_NUM_ENTRIES, &data, 1);
1618         card->tst_addr = new_tst;
1619 }
1620
1621 static int _ns_send(struct atm_vcc *vcc, struct sk_buff *skb, bool may_sleep)
1622 {
1623         ns_dev *card;
1624         vc_map *vc;
1625         scq_info *scq;
1626         unsigned long buflen;
1627         ns_scqe scqe;
1628         u32 flags;              /* TBD flags, not CPU flags */
1629
1630         card = vcc->dev->dev_data;
1631         TXPRINTK("nicstar%d: ns_send() called.\n", card->index);
1632         if ((vc = (vc_map *) vcc->dev_data) == NULL) {
1633                 printk("nicstar%d: vcc->dev_data == NULL on ns_send().\n",
1634                        card->index);
1635                 atomic_inc(&vcc->stats->tx_err);
1636                 dev_kfree_skb_any(skb);
1637                 return -EINVAL;
1638         }
1639
1640         if (!vc->tx) {
1641                 printk("nicstar%d: Trying to transmit on a non-tx VC.\n",
1642                        card->index);
1643                 atomic_inc(&vcc->stats->tx_err);
1644                 dev_kfree_skb_any(skb);
1645                 return -EINVAL;
1646         }
1647
1648         if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0) {
1649                 printk("nicstar%d: Only AAL0 and AAL5 are supported.\n",
1650                        card->index);
1651                 atomic_inc(&vcc->stats->tx_err);
1652                 dev_kfree_skb_any(skb);
1653                 return -EINVAL;
1654         }
1655
1656         if (skb_shinfo(skb)->nr_frags != 0) {
1657                 printk("nicstar%d: No scatter-gather yet.\n", card->index);
1658                 atomic_inc(&vcc->stats->tx_err);
1659                 dev_kfree_skb_any(skb);
1660                 return -EINVAL;
1661         }
1662
1663         ATM_SKB(skb)->vcc = vcc;
1664
1665         NS_PRV_DMA(skb) = dma_map_single(&card->pcidev->dev, skb->data,
1666                                          skb->len, DMA_TO_DEVICE);
1667
1668         if (vcc->qos.aal == ATM_AAL5) {
1669                 buflen = (skb->len + 47 + 8) / 48 * 48; /* Multiple of 48 */
1670                 flags = NS_TBD_AAL5;
1671                 scqe.word_2 = cpu_to_le32(NS_PRV_DMA(skb));
1672                 scqe.word_3 = cpu_to_le32(skb->len);
1673                 scqe.word_4 =
1674                     ns_tbd_mkword_4(0, (u32) vcc->vpi, (u32) vcc->vci, 0,
1675                                     ATM_SKB(skb)->
1676                                     atm_options & ATM_ATMOPT_CLP ? 1 : 0);
1677                 flags |= NS_TBD_EOPDU;
1678         } else {                /* (vcc->qos.aal == ATM_AAL0) */
1679
1680                 buflen = ATM_CELL_PAYLOAD;      /* i.e., 48 bytes */
1681                 flags = NS_TBD_AAL0;
1682                 scqe.word_2 = cpu_to_le32(NS_PRV_DMA(skb) + NS_AAL0_HEADER);
1683                 scqe.word_3 = cpu_to_le32(0x00000000);
1684                 if (*skb->data & 0x02)  /* Payload type 1 - end of pdu */
1685                         flags |= NS_TBD_EOPDU;
1686                 scqe.word_4 =
1687                     cpu_to_le32(*((u32 *) skb->data) & ~NS_TBD_VC_MASK);
1688                 /* Force the VPI/VCI to be the same as in VCC struct */
1689                 scqe.word_4 |=
1690                     cpu_to_le32((((u32) vcc->
1691                                   vpi) << NS_TBD_VPI_SHIFT | ((u32) vcc->
1692                                                               vci) <<
1693                                  NS_TBD_VCI_SHIFT) & NS_TBD_VC_MASK);
1694         }
1695
1696         if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1697                 scqe.word_1 = ns_tbd_mkword_1_novbr(flags, (u32) buflen);
1698                 scq = ((vc_map *) vcc->dev_data)->scq;
1699         } else {
1700                 scqe.word_1 =
1701                     ns_tbd_mkword_1(flags, (u32) 1, (u32) 1, (u32) buflen);
1702                 scq = card->scq0;
1703         }
1704
1705         if (push_scqe(card, vc, scq, &scqe, skb, may_sleep) != 0) {
1706                 atomic_inc(&vcc->stats->tx_err);
1707                 dma_unmap_single(&card->pcidev->dev, NS_PRV_DMA(skb), skb->len,
1708                                  DMA_TO_DEVICE);
1709                 dev_kfree_skb_any(skb);
1710                 return -EIO;
1711         }
1712         atomic_inc(&vcc->stats->tx);
1713
1714         return 0;
1715 }
1716
1717 static int ns_send(struct atm_vcc *vcc, struct sk_buff *skb)
1718 {
1719         return _ns_send(vcc, skb, true);
1720 }
1721
1722 static int ns_send_bh(struct atm_vcc *vcc, struct sk_buff *skb)
1723 {
1724         return _ns_send(vcc, skb, false);
1725 }
1726
1727 static int push_scqe(ns_dev * card, vc_map * vc, scq_info * scq, ns_scqe * tbd,
1728                      struct sk_buff *skb, bool may_sleep)
1729 {
1730         unsigned long flags;
1731         ns_scqe tsr;
1732         u32 scdi, scqi;
1733         int scq_is_vbr;
1734         u32 data;
1735         int index;
1736
1737         spin_lock_irqsave(&scq->lock, flags);
1738         while (scq->tail == scq->next) {
1739                 if (!may_sleep) {
1740                         spin_unlock_irqrestore(&scq->lock, flags);
1741                         printk("nicstar%d: Error pushing TBD.\n", card->index);
1742                         return 1;
1743                 }
1744
1745                 scq->full = 1;
1746                 wait_event_interruptible_lock_irq_timeout(scq->scqfull_waitq,
1747                                                           scq->tail != scq->next,
1748                                                           scq->lock,
1749                                                           SCQFULL_TIMEOUT);
1750
1751                 if (scq->full) {
1752                         spin_unlock_irqrestore(&scq->lock, flags);
1753                         printk("nicstar%d: Timeout pushing TBD.\n",
1754                                card->index);
1755                         return 1;
1756                 }
1757         }
1758         *scq->next = *tbd;
1759         index = (int)(scq->next - scq->base);
1760         scq->skb[index] = skb;
1761         XPRINTK("nicstar%d: sending skb at 0x%p (pos %d).\n",
1762                 card->index, skb, index);
1763         XPRINTK("nicstar%d: TBD written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%p.\n",
1764                 card->index, le32_to_cpu(tbd->word_1), le32_to_cpu(tbd->word_2),
1765                 le32_to_cpu(tbd->word_3), le32_to_cpu(tbd->word_4),
1766                 scq->next);
1767         if (scq->next == scq->last)
1768                 scq->next = scq->base;
1769         else
1770                 scq->next++;
1771
1772         vc->tbd_count++;
1773         if (scq->num_entries == VBR_SCQ_NUM_ENTRIES) {
1774                 scq->tbd_count++;
1775                 scq_is_vbr = 1;
1776         } else
1777                 scq_is_vbr = 0;
1778
1779         if (vc->tbd_count >= MAX_TBD_PER_VC
1780             || scq->tbd_count >= MAX_TBD_PER_SCQ) {
1781                 int has_run = 0;
1782
1783                 while (scq->tail == scq->next) {
1784                         if (!may_sleep) {
1785                                 data = scq_virt_to_bus(scq, scq->next);
1786                                 ns_write_sram(card, scq->scd, &data, 1);
1787                                 spin_unlock_irqrestore(&scq->lock, flags);
1788                                 printk("nicstar%d: Error pushing TSR.\n",
1789                                        card->index);
1790                                 return 0;
1791                         }
1792
1793                         scq->full = 1;
1794                         if (has_run++)
1795                                 break;
1796                         wait_event_interruptible_lock_irq_timeout(scq->scqfull_waitq,
1797                                                                   scq->tail != scq->next,
1798                                                                   scq->lock,
1799                                                                   SCQFULL_TIMEOUT);
1800                 }
1801
1802                 if (!scq->full) {
1803                         tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
1804                         if (scq_is_vbr)
1805                                 scdi = NS_TSR_SCDISVBR;
1806                         else
1807                                 scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
1808                         scqi = scq->next - scq->base;
1809                         tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
1810                         tsr.word_3 = 0x00000000;
1811                         tsr.word_4 = 0x00000000;
1812
1813                         *scq->next = tsr;
1814                         index = (int)scqi;
1815                         scq->skb[index] = NULL;
1816                         XPRINTK
1817                             ("nicstar%d: TSR written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%p.\n",
1818                              card->index, le32_to_cpu(tsr.word_1),
1819                              le32_to_cpu(tsr.word_2), le32_to_cpu(tsr.word_3),
1820                              le32_to_cpu(tsr.word_4), scq->next);
1821                         if (scq->next == scq->last)
1822                                 scq->next = scq->base;
1823                         else
1824                                 scq->next++;
1825                         vc->tbd_count = 0;
1826                         scq->tbd_count = 0;
1827                 } else
1828                         PRINTK("nicstar%d: Timeout pushing TSR.\n",
1829                                card->index);
1830         }
1831         data = scq_virt_to_bus(scq, scq->next);
1832         ns_write_sram(card, scq->scd, &data, 1);
1833
1834         spin_unlock_irqrestore(&scq->lock, flags);
1835
1836         return 0;
1837 }
1838
1839 static void process_tsq(ns_dev * card)
1840 {
1841         u32 scdi;
1842         scq_info *scq;
1843         ns_tsi *previous = NULL, *one_ahead, *two_ahead;
1844         int serviced_entries;   /* flag indicating at least on entry was serviced */
1845
1846         serviced_entries = 0;
1847
1848         if (card->tsq.next == card->tsq.last)
1849                 one_ahead = card->tsq.base;
1850         else
1851                 one_ahead = card->tsq.next + 1;
1852
1853         if (one_ahead == card->tsq.last)
1854                 two_ahead = card->tsq.base;
1855         else
1856                 two_ahead = one_ahead + 1;
1857
1858         while (!ns_tsi_isempty(card->tsq.next) || !ns_tsi_isempty(one_ahead) ||
1859                !ns_tsi_isempty(two_ahead))
1860                 /* At most two empty, as stated in the 77201 errata */
1861         {
1862                 serviced_entries = 1;
1863
1864                 /* Skip the one or two possible empty entries */
1865                 while (ns_tsi_isempty(card->tsq.next)) {
1866                         if (card->tsq.next == card->tsq.last)
1867                                 card->tsq.next = card->tsq.base;
1868                         else
1869                                 card->tsq.next++;
1870                 }
1871
1872                 if (!ns_tsi_tmrof(card->tsq.next)) {
1873                         scdi = ns_tsi_getscdindex(card->tsq.next);
1874                         if (scdi == NS_TSI_SCDISVBR)
1875                                 scq = card->scq0;
1876                         else {
1877                                 if (card->scd2vc[scdi] == NULL) {
1878                                         printk
1879                                             ("nicstar%d: could not find VC from SCD index.\n",
1880                                              card->index);
1881                                         ns_tsi_init(card->tsq.next);
1882                                         return;
1883                                 }
1884                                 scq = card->scd2vc[scdi]->scq;
1885                         }
1886                         drain_scq(card, scq, ns_tsi_getscqpos(card->tsq.next));
1887                         scq->full = 0;
1888                         wake_up_interruptible(&(scq->scqfull_waitq));
1889                 }
1890
1891                 ns_tsi_init(card->tsq.next);
1892                 previous = card->tsq.next;
1893                 if (card->tsq.next == card->tsq.last)
1894                         card->tsq.next = card->tsq.base;
1895                 else
1896                         card->tsq.next++;
1897
1898                 if (card->tsq.next == card->tsq.last)
1899                         one_ahead = card->tsq.base;
1900                 else
1901                         one_ahead = card->tsq.next + 1;
1902
1903                 if (one_ahead == card->tsq.last)
1904                         two_ahead = card->tsq.base;
1905                 else
1906                         two_ahead = one_ahead + 1;
1907         }
1908
1909         if (serviced_entries)
1910                 writel(PTR_DIFF(previous, card->tsq.base),
1911                        card->membase + TSQH);
1912 }
1913
1914 static void drain_scq(ns_dev * card, scq_info * scq, int pos)
1915 {
1916         struct atm_vcc *vcc;
1917         struct sk_buff *skb;
1918         int i;
1919         unsigned long flags;
1920
1921         XPRINTK("nicstar%d: drain_scq() called, scq at 0x%p, pos %d.\n",
1922                 card->index, scq, pos);
1923         if (pos >= scq->num_entries) {
1924                 printk("nicstar%d: Bad index on drain_scq().\n", card->index);
1925                 return;
1926         }
1927
1928         spin_lock_irqsave(&scq->lock, flags);
1929         i = (int)(scq->tail - scq->base);
1930         if (++i == scq->num_entries)
1931                 i = 0;
1932         while (i != pos) {
1933                 skb = scq->skb[i];
1934                 XPRINTK("nicstar%d: freeing skb at 0x%p (index %d).\n",
1935                         card->index, skb, i);
1936                 if (skb != NULL) {
1937                         dma_unmap_single(&card->pcidev->dev,
1938                                          NS_PRV_DMA(skb),
1939                                          skb->len,
1940                                          DMA_TO_DEVICE);
1941                         vcc = ATM_SKB(skb)->vcc;
1942                         if (vcc && vcc->pop != NULL) {
1943                                 vcc->pop(vcc, skb);
1944                         } else {
1945                                 dev_kfree_skb_irq(skb);
1946                         }
1947                         scq->skb[i] = NULL;
1948                 }
1949                 if (++i == scq->num_entries)
1950                         i = 0;
1951         }
1952         scq->tail = scq->base + pos;
1953         spin_unlock_irqrestore(&scq->lock, flags);
1954 }
1955
1956 static void process_rsq(ns_dev * card)
1957 {
1958         ns_rsqe *previous;
1959
1960         if (!ns_rsqe_valid(card->rsq.next))
1961                 return;
1962         do {
1963                 dequeue_rx(card, card->rsq.next);
1964                 ns_rsqe_init(card->rsq.next);
1965                 previous = card->rsq.next;
1966                 if (card->rsq.next == card->rsq.last)
1967                         card->rsq.next = card->rsq.base;
1968                 else
1969                         card->rsq.next++;
1970         } while (ns_rsqe_valid(card->rsq.next));
1971         writel(PTR_DIFF(previous, card->rsq.base), card->membase + RSQH);
1972 }
1973
1974 static void dequeue_rx(ns_dev * card, ns_rsqe * rsqe)
1975 {
1976         u32 vpi, vci;
1977         vc_map *vc;
1978         struct sk_buff *iovb;
1979         struct iovec *iov;
1980         struct atm_vcc *vcc;
1981         struct sk_buff *skb;
1982         unsigned short aal5_len;
1983         int len;
1984         u32 stat;
1985         u32 id;
1986
1987         stat = readl(card->membase + STAT);
1988         card->sbfqc = ns_stat_sfbqc_get(stat);
1989         card->lbfqc = ns_stat_lfbqc_get(stat);
1990
1991         id = le32_to_cpu(rsqe->buffer_handle);
1992         skb = idr_remove(&card->idr, id);
1993         if (!skb) {
1994                 RXPRINTK(KERN_ERR
1995                          "nicstar%d: skb not found!\n", card->index);
1996                 return;
1997         }
1998         dma_sync_single_for_cpu(&card->pcidev->dev,
1999                                 NS_PRV_DMA(skb),
2000                                 (NS_PRV_BUFTYPE(skb) == BUF_SM
2001                                  ? NS_SMSKBSIZE : NS_LGSKBSIZE),
2002                                 DMA_FROM_DEVICE);
2003         dma_unmap_single(&card->pcidev->dev,
2004                          NS_PRV_DMA(skb),
2005                          (NS_PRV_BUFTYPE(skb) == BUF_SM
2006                           ? NS_SMSKBSIZE : NS_LGSKBSIZE),
2007                          DMA_FROM_DEVICE);
2008         vpi = ns_rsqe_vpi(rsqe);
2009         vci = ns_rsqe_vci(rsqe);
2010         if (vpi >= 1UL << card->vpibits || vci >= 1UL << card->vcibits) {
2011                 printk("nicstar%d: SDU received for out-of-range vc %d.%d.\n",
2012                        card->index, vpi, vci);
2013                 recycle_rx_buf(card, skb);
2014                 return;
2015         }
2016
2017         vc = &(card->vcmap[vpi << card->vcibits | vci]);
2018         if (!vc->rx) {
2019                 RXPRINTK("nicstar%d: SDU received on non-rx vc %d.%d.\n",
2020                          card->index, vpi, vci);
2021                 recycle_rx_buf(card, skb);
2022                 return;
2023         }
2024
2025         vcc = vc->rx_vcc;
2026
2027         if (vcc->qos.aal == ATM_AAL0) {
2028                 struct sk_buff *sb;
2029                 unsigned char *cell;
2030                 int i;
2031
2032                 cell = skb->data;
2033                 for (i = ns_rsqe_cellcount(rsqe); i; i--) {
2034                         sb = dev_alloc_skb(NS_SMSKBSIZE);
2035                         if (!sb) {
2036                                 printk
2037                                     ("nicstar%d: Can't allocate buffers for aal0.\n",
2038                                      card->index);
2039                                 atomic_add(i, &vcc->stats->rx_drop);
2040                                 break;
2041                         }
2042                         if (!atm_charge(vcc, sb->truesize)) {
2043                                 RXPRINTK
2044                                     ("nicstar%d: atm_charge() dropped aal0 packets.\n",
2045                                      card->index);
2046                                 atomic_add(i - 1, &vcc->stats->rx_drop);        /* already increased by 1 */
2047                                 dev_kfree_skb_any(sb);
2048                                 break;
2049                         }
2050                         /* Rebuild the header */
2051                         *((u32 *) sb->data) = le32_to_cpu(rsqe->word_1) << 4 |
2052                             (ns_rsqe_clp(rsqe) ? 0x00000001 : 0x00000000);
2053                         if (i == 1 && ns_rsqe_eopdu(rsqe))
2054                                 *((u32 *) sb->data) |= 0x00000002;
2055                         skb_put(sb, NS_AAL0_HEADER);
2056                         memcpy(skb_tail_pointer(sb), cell, ATM_CELL_PAYLOAD);
2057                         skb_put(sb, ATM_CELL_PAYLOAD);
2058                         ATM_SKB(sb)->vcc = vcc;
2059                         __net_timestamp(sb);
2060                         vcc->push(vcc, sb);
2061                         atomic_inc(&vcc->stats->rx);
2062                         cell += ATM_CELL_PAYLOAD;
2063                 }
2064
2065                 recycle_rx_buf(card, skb);
2066                 return;
2067         }
2068
2069         /* To reach this point, the AAL layer can only be AAL5 */
2070
2071         if ((iovb = vc->rx_iov) == NULL) {
2072                 iovb = skb_dequeue(&(card->iovpool.queue));
2073                 if (iovb == NULL) {     /* No buffers in the queue */
2074                         iovb = alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC);
2075                         if (iovb == NULL) {
2076                                 printk("nicstar%d: Out of iovec buffers.\n",
2077                                        card->index);
2078                                 atomic_inc(&vcc->stats->rx_drop);
2079                                 recycle_rx_buf(card, skb);
2080                                 return;
2081                         }
2082                         NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2083                 } else if (--card->iovpool.count < card->iovnr.min) {
2084                         struct sk_buff *new_iovb;
2085                         if ((new_iovb =
2086                              alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC)) != NULL) {
2087                                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2088                                 skb_queue_tail(&card->iovpool.queue, new_iovb);
2089                                 card->iovpool.count++;
2090                         }
2091                 }
2092                 vc->rx_iov = iovb;
2093                 NS_PRV_IOVCNT(iovb) = 0;
2094                 iovb->len = 0;
2095                 iovb->data = iovb->head;
2096                 skb_reset_tail_pointer(iovb);
2097                 /* IMPORTANT: a pointer to the sk_buff containing the small or large
2098                    buffer is stored as iovec base, NOT a pointer to the
2099                    small or large buffer itself. */
2100         } else if (NS_PRV_IOVCNT(iovb) >= NS_MAX_IOVECS) {
2101                 printk("nicstar%d: received too big AAL5 SDU.\n", card->index);
2102                 atomic_inc(&vcc->stats->rx_err);
2103                 recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2104                                       NS_MAX_IOVECS);
2105                 NS_PRV_IOVCNT(iovb) = 0;
2106                 iovb->len = 0;
2107                 iovb->data = iovb->head;
2108                 skb_reset_tail_pointer(iovb);
2109         }
2110         iov = &((struct iovec *)iovb->data)[NS_PRV_IOVCNT(iovb)++];
2111         iov->iov_base = (void *)skb;
2112         iov->iov_len = ns_rsqe_cellcount(rsqe) * 48;
2113         iovb->len += iov->iov_len;
2114
2115 #ifdef EXTRA_DEBUG
2116         if (NS_PRV_IOVCNT(iovb) == 1) {
2117                 if (NS_PRV_BUFTYPE(skb) != BUF_SM) {
2118                         printk
2119                             ("nicstar%d: Expected a small buffer, and this is not one.\n",
2120                              card->index);
2121                         which_list(card, skb);
2122                         atomic_inc(&vcc->stats->rx_err);
2123                         recycle_rx_buf(card, skb);
2124                         vc->rx_iov = NULL;
2125                         recycle_iov_buf(card, iovb);
2126                         return;
2127                 }
2128         } else {                /* NS_PRV_IOVCNT(iovb) >= 2 */
2129
2130                 if (NS_PRV_BUFTYPE(skb) != BUF_LG) {
2131                         printk
2132                             ("nicstar%d: Expected a large buffer, and this is not one.\n",
2133                              card->index);
2134                         which_list(card, skb);
2135                         atomic_inc(&vcc->stats->rx_err);
2136                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2137                                               NS_PRV_IOVCNT(iovb));
2138                         vc->rx_iov = NULL;
2139                         recycle_iov_buf(card, iovb);
2140                         return;
2141                 }
2142         }
2143 #endif /* EXTRA_DEBUG */
2144
2145         if (ns_rsqe_eopdu(rsqe)) {
2146                 /* This works correctly regardless of the endianness of the host */
2147                 unsigned char *L1L2 = (unsigned char *)
2148                                                 (skb->data + iov->iov_len - 6);
2149                 aal5_len = L1L2[0] << 8 | L1L2[1];
2150                 len = (aal5_len == 0x0000) ? 0x10000 : aal5_len;
2151                 if (ns_rsqe_crcerr(rsqe) ||
2152                     len + 8 > iovb->len || len + (47 + 8) < iovb->len) {
2153                         printk("nicstar%d: AAL5 CRC error", card->index);
2154                         if (len + 8 > iovb->len || len + (47 + 8) < iovb->len)
2155                                 printk(" - PDU size mismatch.\n");
2156                         else
2157                                 printk(".\n");
2158                         atomic_inc(&vcc->stats->rx_err);
2159                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2160                                               NS_PRV_IOVCNT(iovb));
2161                         vc->rx_iov = NULL;
2162                         recycle_iov_buf(card, iovb);
2163                         return;
2164                 }
2165
2166                 /* By this point we (hopefully) have a complete SDU without errors. */
2167
2168                 if (NS_PRV_IOVCNT(iovb) == 1) { /* Just a small buffer */
2169                         /* skb points to a small buffer */
2170                         if (!atm_charge(vcc, skb->truesize)) {
2171                                 push_rxbufs(card, skb);
2172                                 atomic_inc(&vcc->stats->rx_drop);
2173                         } else {
2174                                 skb_put(skb, len);
2175                                 dequeue_sm_buf(card, skb);
2176                                 ATM_SKB(skb)->vcc = vcc;
2177                                 __net_timestamp(skb);
2178                                 vcc->push(vcc, skb);
2179                                 atomic_inc(&vcc->stats->rx);
2180                         }
2181                 } else if (NS_PRV_IOVCNT(iovb) == 2) {  /* One small plus one large buffer */
2182                         struct sk_buff *sb;
2183
2184                         sb = (struct sk_buff *)(iov - 1)->iov_base;
2185                         /* skb points to a large buffer */
2186
2187                         if (len <= NS_SMBUFSIZE) {
2188                                 if (!atm_charge(vcc, sb->truesize)) {
2189                                         push_rxbufs(card, sb);
2190                                         atomic_inc(&vcc->stats->rx_drop);
2191                                 } else {
2192                                         skb_put(sb, len);
2193                                         dequeue_sm_buf(card, sb);
2194                                         ATM_SKB(sb)->vcc = vcc;
2195                                         __net_timestamp(sb);
2196                                         vcc->push(vcc, sb);
2197                                         atomic_inc(&vcc->stats->rx);
2198                                 }
2199
2200                                 push_rxbufs(card, skb);
2201
2202                         } else {        /* len > NS_SMBUFSIZE, the usual case */
2203
2204                                 if (!atm_charge(vcc, skb->truesize)) {
2205                                         push_rxbufs(card, skb);
2206                                         atomic_inc(&vcc->stats->rx_drop);
2207                                 } else {
2208                                         dequeue_lg_buf(card, skb);
2209                                         skb_push(skb, NS_SMBUFSIZE);
2210                                         skb_copy_from_linear_data(sb, skb->data,
2211                                                                   NS_SMBUFSIZE);
2212                                         skb_put(skb, len - NS_SMBUFSIZE);
2213                                         ATM_SKB(skb)->vcc = vcc;
2214                                         __net_timestamp(skb);
2215                                         vcc->push(vcc, skb);
2216                                         atomic_inc(&vcc->stats->rx);
2217                                 }
2218
2219                                 push_rxbufs(card, sb);
2220
2221                         }
2222
2223                 } else {        /* Must push a huge buffer */
2224
2225                         struct sk_buff *hb, *sb, *lb;
2226                         int remaining, tocopy;
2227                         int j;
2228
2229                         hb = skb_dequeue(&(card->hbpool.queue));
2230                         if (hb == NULL) {       /* No buffers in the queue */
2231
2232                                 hb = dev_alloc_skb(NS_HBUFSIZE);
2233                                 if (hb == NULL) {
2234                                         printk
2235                                             ("nicstar%d: Out of huge buffers.\n",
2236                                              card->index);
2237                                         atomic_inc(&vcc->stats->rx_drop);
2238                                         recycle_iovec_rx_bufs(card,
2239                                                               (struct iovec *)
2240                                                               iovb->data,
2241                                                               NS_PRV_IOVCNT(iovb));
2242                                         vc->rx_iov = NULL;
2243                                         recycle_iov_buf(card, iovb);
2244                                         return;
2245                                 } else if (card->hbpool.count < card->hbnr.min) {
2246                                         struct sk_buff *new_hb;
2247                                         if ((new_hb =
2248                                              dev_alloc_skb(NS_HBUFSIZE)) !=
2249                                             NULL) {
2250                                                 skb_queue_tail(&card->hbpool.
2251                                                                queue, new_hb);
2252                                                 card->hbpool.count++;
2253                                         }
2254                                 }
2255                                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
2256                         } else if (--card->hbpool.count < card->hbnr.min) {
2257                                 struct sk_buff *new_hb;
2258                                 if ((new_hb =
2259                                      dev_alloc_skb(NS_HBUFSIZE)) != NULL) {
2260                                         NS_PRV_BUFTYPE(new_hb) = BUF_NONE;
2261                                         skb_queue_tail(&card->hbpool.queue,
2262                                                        new_hb);
2263                                         card->hbpool.count++;
2264                                 }
2265                                 if (card->hbpool.count < card->hbnr.min) {
2266                                         if ((new_hb =
2267                                              dev_alloc_skb(NS_HBUFSIZE)) !=
2268                                             NULL) {
2269                                                 NS_PRV_BUFTYPE(new_hb) =
2270                                                     BUF_NONE;
2271                                                 skb_queue_tail(&card->hbpool.
2272                                                                queue, new_hb);
2273                                                 card->hbpool.count++;
2274                                         }
2275                                 }
2276                         }
2277
2278                         iov = (struct iovec *)iovb->data;
2279
2280                         if (!atm_charge(vcc, hb->truesize)) {
2281                                 recycle_iovec_rx_bufs(card, iov,
2282                                                       NS_PRV_IOVCNT(iovb));
2283                                 if (card->hbpool.count < card->hbnr.max) {
2284                                         skb_queue_tail(&card->hbpool.queue, hb);
2285                                         card->hbpool.count++;
2286                                 } else
2287                                         dev_kfree_skb_any(hb);
2288                                 atomic_inc(&vcc->stats->rx_drop);
2289                         } else {
2290                                 /* Copy the small buffer to the huge buffer */
2291                                 sb = (struct sk_buff *)iov->iov_base;
2292                                 skb_copy_from_linear_data(sb, hb->data,
2293                                                           iov->iov_len);
2294                                 skb_put(hb, iov->iov_len);
2295                                 remaining = len - iov->iov_len;
2296                                 iov++;
2297                                 /* Free the small buffer */
2298                                 push_rxbufs(card, sb);
2299
2300                                 /* Copy all large buffers to the huge buffer and free them */
2301                                 for (j = 1; j < NS_PRV_IOVCNT(iovb); j++) {
2302                                         lb = (struct sk_buff *)iov->iov_base;
2303                                         tocopy =
2304                                             min_t(int, remaining, iov->iov_len);
2305                                         skb_copy_from_linear_data(lb,
2306                                                                   skb_tail_pointer
2307                                                                   (hb), tocopy);
2308                                         skb_put(hb, tocopy);
2309                                         iov++;
2310                                         remaining -= tocopy;
2311                                         push_rxbufs(card, lb);
2312                                 }
2313 #ifdef EXTRA_DEBUG
2314                                 if (remaining != 0 || hb->len != len)
2315                                         printk
2316                                             ("nicstar%d: Huge buffer len mismatch.\n",
2317                                              card->index);
2318 #endif /* EXTRA_DEBUG */
2319                                 ATM_SKB(hb)->vcc = vcc;
2320                                 __net_timestamp(hb);
2321                                 vcc->push(vcc, hb);
2322                                 atomic_inc(&vcc->stats->rx);
2323                         }
2324                 }
2325
2326                 vc->rx_iov = NULL;
2327                 recycle_iov_buf(card, iovb);
2328         }
2329
2330 }
2331
2332 static void recycle_rx_buf(ns_dev * card, struct sk_buff *skb)
2333 {
2334         if (unlikely(NS_PRV_BUFTYPE(skb) == BUF_NONE)) {
2335                 printk("nicstar%d: What kind of rx buffer is this?\n",
2336                        card->index);
2337                 dev_kfree_skb_any(skb);
2338         } else
2339                 push_rxbufs(card, skb);
2340 }
2341
2342 static void recycle_iovec_rx_bufs(ns_dev * card, struct iovec *iov, int count)
2343 {
2344         while (count-- > 0)
2345                 recycle_rx_buf(card, (struct sk_buff *)(iov++)->iov_base);
2346 }
2347
2348 static void recycle_iov_buf(ns_dev * card, struct sk_buff *iovb)
2349 {
2350         if (card->iovpool.count < card->iovnr.max) {
2351                 skb_queue_tail(&card->iovpool.queue, iovb);
2352                 card->iovpool.count++;
2353         } else
2354                 dev_kfree_skb_any(iovb);
2355 }
2356
2357 static void dequeue_sm_buf(ns_dev * card, struct sk_buff *sb)
2358 {
2359         skb_unlink(sb, &card->sbpool.queue);
2360         if (card->sbfqc < card->sbnr.init) {
2361                 struct sk_buff *new_sb;
2362                 if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL) {
2363                         NS_PRV_BUFTYPE(new_sb) = BUF_SM;
2364                         skb_queue_tail(&card->sbpool.queue, new_sb);
2365                         skb_reserve(new_sb, NS_AAL0_HEADER);
2366                         push_rxbufs(card, new_sb);
2367                 }
2368         }
2369         if (card->sbfqc < card->sbnr.init)
2370         {
2371                 struct sk_buff *new_sb;
2372                 if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL) {
2373                         NS_PRV_BUFTYPE(new_sb) = BUF_SM;
2374                         skb_queue_tail(&card->sbpool.queue, new_sb);
2375                         skb_reserve(new_sb, NS_AAL0_HEADER);
2376                         push_rxbufs(card, new_sb);
2377                 }
2378         }
2379 }
2380
2381 static void dequeue_lg_buf(ns_dev * card, struct sk_buff *lb)
2382 {
2383         skb_unlink(lb, &card->lbpool.queue);
2384         if (card->lbfqc < card->lbnr.init) {
2385                 struct sk_buff *new_lb;
2386                 if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL) {
2387                         NS_PRV_BUFTYPE(new_lb) = BUF_LG;
2388                         skb_queue_tail(&card->lbpool.queue, new_lb);
2389                         skb_reserve(new_lb, NS_SMBUFSIZE);
2390                         push_rxbufs(card, new_lb);
2391                 }
2392         }
2393         if (card->lbfqc < card->lbnr.init)
2394         {
2395                 struct sk_buff *new_lb;
2396                 if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL) {
2397                         NS_PRV_BUFTYPE(new_lb) = BUF_LG;
2398                         skb_queue_tail(&card->lbpool.queue, new_lb);
2399                         skb_reserve(new_lb, NS_SMBUFSIZE);
2400                         push_rxbufs(card, new_lb);
2401                 }
2402         }
2403 }
2404
2405 static int ns_proc_read(struct atm_dev *dev, loff_t * pos, char *page)
2406 {
2407         u32 stat;
2408         ns_dev *card;
2409         int left;
2410
2411         left = (int)*pos;
2412         card = (ns_dev *) dev->dev_data;
2413         stat = readl(card->membase + STAT);
2414         if (!left--)
2415                 return sprintf(page, "Pool   count    min   init    max \n");
2416         if (!left--)
2417                 return sprintf(page, "Small  %5d  %5d  %5d  %5d \n",
2418                                ns_stat_sfbqc_get(stat), card->sbnr.min,
2419                                card->sbnr.init, card->sbnr.max);
2420         if (!left--)
2421                 return sprintf(page, "Large  %5d  %5d  %5d  %5d \n",
2422                                ns_stat_lfbqc_get(stat), card->lbnr.min,
2423                                card->lbnr.init, card->lbnr.max);
2424         if (!left--)
2425                 return sprintf(page, "Huge   %5d  %5d  %5d  %5d \n",
2426                                card->hbpool.count, card->hbnr.min,
2427                                card->hbnr.init, card->hbnr.max);
2428         if (!left--)
2429                 return sprintf(page, "Iovec  %5d  %5d  %5d  %5d \n",
2430                                card->iovpool.count, card->iovnr.min,
2431                                card->iovnr.init, card->iovnr.max);
2432         if (!left--) {
2433                 int retval;
2434                 retval =
2435                     sprintf(page, "Interrupt counter: %u \n", card->intcnt);
2436                 card->intcnt = 0;
2437                 return retval;
2438         }
2439 #if 0
2440         /* Dump 25.6 Mbps PHY registers */
2441         /* Now there's a 25.6 Mbps PHY driver this code isn't needed. I left it
2442            here just in case it's needed for debugging. */
2443         if (card->max_pcr == ATM_25_PCR && !left--) {
2444                 u32 phy_regs[4];
2445                 u32 i;
2446
2447                 for (i = 0; i < 4; i++) {
2448                         while (CMD_BUSY(card)) ;
2449                         writel(NS_CMD_READ_UTILITY | 0x00000200 | i,
2450                                card->membase + CMD);
2451                         while (CMD_BUSY(card)) ;
2452                         phy_regs[i] = readl(card->membase + DR0) & 0x000000FF;
2453                 }
2454
2455                 return sprintf(page, "PHY regs: 0x%02X 0x%02X 0x%02X 0x%02X \n",
2456                                phy_regs[0], phy_regs[1], phy_regs[2],
2457                                phy_regs[3]);
2458         }
2459 #endif /* 0 - Dump 25.6 Mbps PHY registers */
2460 #if 0
2461         /* Dump TST */
2462         if (left-- < NS_TST_NUM_ENTRIES) {
2463                 if (card->tste2vc[left + 1] == NULL)
2464                         return sprintf(page, "%5d - VBR/UBR \n", left + 1);
2465                 else
2466                         return sprintf(page, "%5d - %d %d \n", left + 1,
2467                                        card->tste2vc[left + 1]->tx_vcc->vpi,
2468                                        card->tste2vc[left + 1]->tx_vcc->vci);
2469         }
2470 #endif /* 0 */
2471         return 0;
2472 }
2473
2474 static int ns_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg)
2475 {
2476         ns_dev *card;
2477         pool_levels pl;
2478         long btype;
2479         unsigned long flags;
2480
2481         card = dev->dev_data;
2482         switch (cmd) {
2483         case NS_GETPSTAT:
2484                 if (get_user
2485                     (pl.buftype, &((pool_levels __user *) arg)->buftype))
2486                         return -EFAULT;
2487                 switch (pl.buftype) {
2488                 case NS_BUFTYPE_SMALL:
2489                         pl.count =
2490                             ns_stat_sfbqc_get(readl(card->membase + STAT));
2491                         pl.level.min = card->sbnr.min;
2492                         pl.level.init = card->sbnr.init;
2493                         pl.level.max = card->sbnr.max;
2494                         break;
2495
2496                 case NS_BUFTYPE_LARGE:
2497                         pl.count =
2498                             ns_stat_lfbqc_get(readl(card->membase + STAT));
2499                         pl.level.min = card->lbnr.min;
2500                         pl.level.init = card->lbnr.init;
2501                         pl.level.max = card->lbnr.max;
2502                         break;
2503
2504                 case NS_BUFTYPE_HUGE:
2505                         pl.count = card->hbpool.count;
2506                         pl.level.min = card->hbnr.min;
2507                         pl.level.init = card->hbnr.init;
2508                         pl.level.max = card->hbnr.max;
2509                         break;
2510
2511                 case NS_BUFTYPE_IOVEC:
2512                         pl.count = card->iovpool.count;
2513                         pl.level.min = card->iovnr.min;
2514                         pl.level.init = card->iovnr.init;
2515                         pl.level.max = card->iovnr.max;
2516                         break;
2517
2518                 default:
2519                         return -ENOIOCTLCMD;
2520
2521                 }
2522                 if (!copy_to_user((pool_levels __user *) arg, &pl, sizeof(pl)))
2523                         return (sizeof(pl));
2524                 else
2525                         return -EFAULT;
2526
2527         case NS_SETBUFLEV:
2528                 if (!capable(CAP_NET_ADMIN))
2529                         return -EPERM;
2530                 if (copy_from_user(&pl, (pool_levels __user *) arg, sizeof(pl)))
2531                         return -EFAULT;
2532                 if (pl.level.min >= pl.level.init
2533                     || pl.level.init >= pl.level.max)
2534                         return -EINVAL;
2535                 if (pl.level.min == 0)
2536                         return -EINVAL;
2537                 switch (pl.buftype) {
2538                 case NS_BUFTYPE_SMALL:
2539                         if (pl.level.max > TOP_SB)
2540                                 return -EINVAL;
2541                         card->sbnr.min = pl.level.min;
2542                         card->sbnr.init = pl.level.init;
2543                         card->sbnr.max = pl.level.max;
2544                         break;
2545
2546                 case NS_BUFTYPE_LARGE:
2547                         if (pl.level.max > TOP_LB)
2548                                 return -EINVAL;
2549                         card->lbnr.min = pl.level.min;
2550                         card->lbnr.init = pl.level.init;
2551                         card->lbnr.max = pl.level.max;
2552                         break;
2553
2554                 case NS_BUFTYPE_HUGE:
2555                         if (pl.level.max > TOP_HB)
2556                                 return -EINVAL;
2557                         card->hbnr.min = pl.level.min;
2558                         card->hbnr.init = pl.level.init;
2559                         card->hbnr.max = pl.level.max;
2560                         break;
2561
2562                 case NS_BUFTYPE_IOVEC:
2563                         if (pl.level.max > TOP_IOVB)
2564                                 return -EINVAL;
2565                         card->iovnr.min = pl.level.min;
2566                         card->iovnr.init = pl.level.init;
2567                         card->iovnr.max = pl.level.max;
2568                         break;
2569
2570                 default:
2571                         return -EINVAL;
2572
2573                 }
2574                 return 0;
2575
2576         case NS_ADJBUFLEV:
2577                 if (!capable(CAP_NET_ADMIN))
2578                         return -EPERM;
2579                 btype = (long)arg;      /* a long is the same size as a pointer or bigger */
2580                 switch (btype) {
2581                 case NS_BUFTYPE_SMALL:
2582                         while (card->sbfqc < card->sbnr.init) {
2583                                 struct sk_buff *sb;
2584
2585                                 sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
2586                                 if (sb == NULL)
2587                                         return -ENOMEM;
2588                                 NS_PRV_BUFTYPE(sb) = BUF_SM;
2589                                 skb_queue_tail(&card->sbpool.queue, sb);
2590                                 skb_reserve(sb, NS_AAL0_HEADER);
2591                                 push_rxbufs(card, sb);
2592                         }
2593                         break;
2594
2595                 case NS_BUFTYPE_LARGE:
2596                         while (card->lbfqc < card->lbnr.init) {
2597                                 struct sk_buff *lb;
2598
2599                                 lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
2600                                 if (lb == NULL)
2601                                         return -ENOMEM;
2602                                 NS_PRV_BUFTYPE(lb) = BUF_LG;
2603                                 skb_queue_tail(&card->lbpool.queue, lb);
2604                                 skb_reserve(lb, NS_SMBUFSIZE);
2605                                 push_rxbufs(card, lb);
2606                         }
2607                         break;
2608
2609                 case NS_BUFTYPE_HUGE:
2610                         while (card->hbpool.count > card->hbnr.init) {
2611                                 struct sk_buff *hb;
2612
2613                                 spin_lock_irqsave(&card->int_lock, flags);
2614                                 hb = skb_dequeue(&card->hbpool.queue);
2615                                 card->hbpool.count--;
2616                                 spin_unlock_irqrestore(&card->int_lock, flags);
2617                                 if (hb == NULL)
2618                                         printk
2619                                             ("nicstar%d: huge buffer count inconsistent.\n",
2620                                              card->index);
2621                                 else
2622                                         dev_kfree_skb_any(hb);
2623
2624                         }
2625                         while (card->hbpool.count < card->hbnr.init) {
2626                                 struct sk_buff *hb;
2627
2628                                 hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
2629                                 if (hb == NULL)
2630                                         return -ENOMEM;
2631                                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
2632                                 spin_lock_irqsave(&card->int_lock, flags);
2633                                 skb_queue_tail(&card->hbpool.queue, hb);
2634                                 card->hbpool.count++;
2635                                 spin_unlock_irqrestore(&card->int_lock, flags);
2636                         }
2637                         break;
2638
2639                 case NS_BUFTYPE_IOVEC:
2640                         while (card->iovpool.count > card->iovnr.init) {
2641                                 struct sk_buff *iovb;
2642
2643                                 spin_lock_irqsave(&card->int_lock, flags);
2644                                 iovb = skb_dequeue(&card->iovpool.queue);
2645                                 card->iovpool.count--;
2646                                 spin_unlock_irqrestore(&card->int_lock, flags);
2647                                 if (iovb == NULL)
2648                                         printk
2649                                             ("nicstar%d: iovec buffer count inconsistent.\n",
2650                                              card->index);
2651                                 else
2652                                         dev_kfree_skb_any(iovb);
2653
2654                         }
2655                         while (card->iovpool.count < card->iovnr.init) {
2656                                 struct sk_buff *iovb;
2657
2658                                 iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
2659                                 if (iovb == NULL)
2660                                         return -ENOMEM;
2661                                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2662                                 spin_lock_irqsave(&card->int_lock, flags);
2663                                 skb_queue_tail(&card->iovpool.queue, iovb);
2664                                 card->iovpool.count++;
2665                                 spin_unlock_irqrestore(&card->int_lock, flags);
2666                         }
2667                         break;
2668
2669                 default:
2670                         return -EINVAL;
2671
2672                 }
2673                 return 0;
2674
2675         default:
2676                 if (dev->phy && dev->phy->ioctl) {
2677                         return dev->phy->ioctl(dev, cmd, arg);
2678                 } else {
2679                         printk("nicstar%d: %s == NULL \n", card->index,
2680                                dev->phy ? "dev->phy->ioctl" : "dev->phy");
2681                         return -ENOIOCTLCMD;
2682                 }
2683         }
2684 }
2685
2686 #ifdef EXTRA_DEBUG
2687 static void which_list(ns_dev * card, struct sk_buff *skb)
2688 {
2689         printk("skb buf_type: 0x%08x\n", NS_PRV_BUFTYPE(skb));
2690 }
2691 #endif /* EXTRA_DEBUG */
2692
2693 static void ns_poll(struct timer_list *unused)
2694 {
2695         int i;
2696         ns_dev *card;
2697         unsigned long flags;
2698         u32 stat_r, stat_w;
2699
2700         PRINTK("nicstar: Entering ns_poll().\n");
2701         for (i = 0; i < num_cards; i++) {
2702                 card = cards[i];
2703                 if (!spin_trylock_irqsave(&card->int_lock, flags)) {
2704                         /* Probably it isn't worth spinning */
2705                         continue;
2706                 }
2707
2708                 stat_w = 0;
2709                 stat_r = readl(card->membase + STAT);
2710                 if (stat_r & NS_STAT_TSIF)
2711                         stat_w |= NS_STAT_TSIF;
2712                 if (stat_r & NS_STAT_EOPDU)
2713                         stat_w |= NS_STAT_EOPDU;
2714
2715                 process_tsq(card);
2716                 process_rsq(card);
2717
2718                 writel(stat_w, card->membase + STAT);
2719                 spin_unlock_irqrestore(&card->int_lock, flags);
2720         }
2721         mod_timer(&ns_timer, jiffies + NS_POLL_PERIOD);
2722         PRINTK("nicstar: Leaving ns_poll().\n");
2723 }
2724
2725 static void ns_phy_put(struct atm_dev *dev, unsigned char value,
2726                        unsigned long addr)
2727 {
2728         ns_dev *card;
2729         unsigned long flags;
2730
2731         card = dev->dev_data;
2732         spin_lock_irqsave(&card->res_lock, flags);
2733         while (CMD_BUSY(card)) ;
2734         writel((u32) value, card->membase + DR0);
2735         writel(NS_CMD_WRITE_UTILITY | 0x00000200 | (addr & 0x000000FF),
2736                card->membase + CMD);
2737         spin_unlock_irqrestore(&card->res_lock, flags);
2738 }
2739
2740 static unsigned char ns_phy_get(struct atm_dev *dev, unsigned long addr)
2741 {
2742         ns_dev *card;
2743         unsigned long flags;
2744         u32 data;
2745
2746         card = dev->dev_data;
2747         spin_lock_irqsave(&card->res_lock, flags);
2748         while (CMD_BUSY(card)) ;
2749         writel(NS_CMD_READ_UTILITY | 0x00000200 | (addr & 0x000000FF),
2750                card->membase + CMD);
2751         while (CMD_BUSY(card)) ;
2752         data = readl(card->membase + DR0) & 0x000000FF;
2753         spin_unlock_irqrestore(&card->res_lock, flags);
2754         return (unsigned char)data;
2755 }
2756
2757 module_init(nicstar_init);
2758 module_exit(nicstar_cleanup);