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         int i;
 865
 866         if (size != VBR_SCQSIZE && size != CBR_SCQSIZE)
 867                 return NULL;
 868
 869         scq = kmalloc(sizeof(*scq), GFP_KERNEL);
 870         if (!scq)
 871                 return NULL;
 872         scq->org = dma_alloc_coherent(&card->pcidev->dev,
 873                                       2 * size,  &scq->dma, GFP_KERNEL);
 874         if (!scq->org) {
 875                 kfree(scq);
 876                 return NULL;
 877         }
 878         scq->skb = kmalloc_array(size / NS_SCQE_SIZE,
 879                                  sizeof(*scq->skb),
 880                                  GFP_KERNEL);
 881         if (!scq->skb) {
 882                 dma_free_coherent(&card->pcidev->dev,
 883                                   2 * size, scq->org, scq->dma);
 884                 kfree(scq);
 885                 return NULL;
 886         }
 887         scq->num_entries = size / NS_SCQE_SIZE;
 888         scq->base = PTR_ALIGN(scq->org, size);
 889         scq->next = scq->base;
 890         scq->last = scq->base + (scq->num_entries - 1);
 891         scq->tail = scq->last;
 892         scq->scd = scd;
 893         scq->num_entries = size / NS_SCQE_SIZE;
 894         scq->tbd_count = 0;
 895         init_waitqueue_head(&scq->scqfull_waitq);
 896         scq->full = 0;
 897         spin_lock_init(&scq->lock);
 898
 899         for (i = 0; i < scq->num_entries; i++)
 900                 scq->skb[i] = NULL;
 901
 902         return scq;
 903 }
 904
 905 /* For variable rate SCQ vcc must be NULL */
 906 static void free_scq(ns_dev *card, scq_info *scq, struct atm_vcc *vcc)
 907 {
 908         int i;
 909
 910         if (scq->num_entries == VBR_SCQ_NUM_ENTRIES)
 911                 for (i = 0; i < scq->num_entries; i++) {
 912                         if (scq->skb[i] != NULL) {
 913                                 vcc = ATM_SKB(scq->skb[i])->vcc;
 914                                 if (vcc->pop != NULL)
 915                                         vcc->pop(vcc, scq->skb[i]);
 916                                 else
 917                                         dev_kfree_skb_any(scq->skb[i]);
 918                         }
 919         } else {                /* vcc must be != NULL */
 920
 921                 if (vcc == NULL) {
 922                         printk
 923                             ("nicstar: free_scq() called with vcc == NULL for fixed rate scq.");
 924                         for (i = 0; i < scq->num_entries; i++)
 925                                 dev_kfree_skb_any(scq->skb[i]);
 926                 } else
 927                         for (i = 0; i < scq->num_entries; i++) {
 928                                 if (scq->skb[i] != NULL) {
 929                                         if (vcc->pop != NULL)
 930                                                 vcc->pop(vcc, scq->skb[i]);
 931                                         else
 932                                                 dev_kfree_skb_any(scq->skb[i]);
 933                                 }
 934                         }
 935         }
 936         kfree(scq->skb);
 937         dma_free_coherent(&card->pcidev->dev,
 938                           2 * (scq->num_entries == VBR_SCQ_NUM_ENTRIES ?
 939                                VBR_SCQSIZE : CBR_SCQSIZE),
 940                           scq->org, scq->dma);
 941         kfree(scq);
 942 }
 943
 944 /* The handles passed must be pointers to the sk_buff containing the small
 945    or large buffer(s) cast to u32. */
 946 static void push_rxbufs(ns_dev * card, struct sk_buff *skb)
 947 {
 948         struct sk_buff *handle1, *handle2;
 949         int id1, id2;
 950         u32 addr1, addr2;
 951         u32 stat;
 952         unsigned long flags;
 953
 954         /* *BARF* */
 955         handle2 = NULL;
 956         addr2 = 0;
 957         handle1 = skb;
 958         addr1 = dma_map_single(&card->pcidev->dev,
 959                                skb->data,
 960                                (NS_PRV_BUFTYPE(skb) == BUF_SM
 961                                 ? NS_SMSKBSIZE : NS_LGSKBSIZE),
 962                                DMA_TO_DEVICE);
 963         NS_PRV_DMA(skb) = addr1; /* save so we can unmap later */
 964
 965 #ifdef GENERAL_DEBUG
 966         if (!addr1)
 967                 printk("nicstar%d: push_rxbufs called with addr1 = 0.\n",
 968                        card->index);
 969 #endif /* GENERAL_DEBUG */
 970
 971         stat = readl(card->membase + STAT);
 972         card->sbfqc = ns_stat_sfbqc_get(stat);
 973         card->lbfqc = ns_stat_lfbqc_get(stat);
 974         if (NS_PRV_BUFTYPE(skb) == BUF_SM) {
 975                 if (!addr2) {
 976                         if (card->sm_addr) {
 977                                 addr2 = card->sm_addr;
 978                                 handle2 = card->sm_handle;
 979                                 card->sm_addr = 0x00000000;
 980                                 card->sm_handle = NULL;
 981                         } else {        /* (!sm_addr) */
 982
 983                                 card->sm_addr = addr1;
 984                                 card->sm_handle = handle1;
 985                         }
 986                 }
 987         } else {                /* buf_type == BUF_LG */
 988
 989                 if (!addr2) {
 990                         if (card->lg_addr) {
 991                                 addr2 = card->lg_addr;
 992                                 handle2 = card->lg_handle;
 993                                 card->lg_addr = 0x00000000;
 994                                 card->lg_handle = NULL;
 995                         } else {        /* (!lg_addr) */
 996
 997                                 card->lg_addr = addr1;
 998                                 card->lg_handle = handle1;
 999                         }
1000                 }
1001         }
1002
1003         if (addr2) {
1004                 if (NS_PRV_BUFTYPE(skb) == BUF_SM) {
1005                         if (card->sbfqc >= card->sbnr.max) {
1006                                 skb_unlink(handle1, &card->sbpool.queue);
1007                                 dev_kfree_skb_any(handle1);
1008                                 skb_unlink(handle2, &card->sbpool.queue);
1009                                 dev_kfree_skb_any(handle2);
1010                                 return;
1011                         } else
1012                                 card->sbfqc += 2;
1013                 } else {        /* (buf_type == BUF_LG) */
1014
1015                         if (card->lbfqc >= card->lbnr.max) {
1016                                 skb_unlink(handle1, &card->lbpool.queue);
1017                                 dev_kfree_skb_any(handle1);
1018                                 skb_unlink(handle2, &card->lbpool.queue);
1019                                 dev_kfree_skb_any(handle2);
1020                                 return;
1021                         } else
1022                                 card->lbfqc += 2;
1023                 }
1024
1025                 id1 = idr_alloc(&card->idr, handle1, 0, 0, GFP_ATOMIC);
1026                 if (id1 < 0)
1027                         goto out;
1028
1029                 id2 = idr_alloc(&card->idr, handle2, 0, 0, GFP_ATOMIC);
1030                 if (id2 < 0)
1031                         goto out;
1032
1033                 spin_lock_irqsave(&card->res_lock, flags);
1034                 while (CMD_BUSY(card)) ;
1035                 writel(addr2, card->membase + DR3);
1036                 writel(id2, card->membase + DR2);
1037                 writel(addr1, card->membase + DR1);
1038                 writel(id1, card->membase + DR0);
1039                 writel(NS_CMD_WRITE_FREEBUFQ | NS_PRV_BUFTYPE(skb),
1040                        card->membase + CMD);
1041                 spin_unlock_irqrestore(&card->res_lock, flags);
1042
1043                 XPRINTK("nicstar%d: Pushing %s buffers at 0x%x and 0x%x.\n",
1044                         card->index,
1045                         (NS_PRV_BUFTYPE(skb) == BUF_SM ? "small" : "large"),
1046                         addr1, addr2);
1047         }
1048
1049         if (!card->efbie && card->sbfqc >= card->sbnr.min &&
1050             card->lbfqc >= card->lbnr.min) {
1051                 card->efbie = 1;
1052                 writel((readl(card->membase + CFG) | NS_CFG_EFBIE),
1053                        card->membase + CFG);
1054         }
1055
1056 out:
1057         return;
1058 }
1059
1060 static irqreturn_t ns_irq_handler(int irq, void *dev_id)
1061 {
1062         u32 stat_r;
1063         ns_dev *card;
1064         struct atm_dev *dev;
1065         unsigned long flags;
1066
1067         card = (ns_dev *) dev_id;
1068         dev = card->atmdev;
1069         card->intcnt++;
1070
1071         PRINTK("nicstar%d: NICStAR generated an interrupt\n", card->index);
1072
1073         spin_lock_irqsave(&card->int_lock, flags);
1074
1075         stat_r = readl(card->membase + STAT);
1076
1077         /* Transmit Status Indicator has been written to T. S. Queue */
1078         if (stat_r & NS_STAT_TSIF) {
1079                 TXPRINTK("nicstar%d: TSI interrupt\n", card->index);
1080                 process_tsq(card);
1081                 writel(NS_STAT_TSIF, card->membase + STAT);
1082         }
1083
1084         /* Incomplete CS-PDU has been transmitted */
1085         if (stat_r & NS_STAT_TXICP) {
1086                 writel(NS_STAT_TXICP, card->membase + STAT);
1087                 TXPRINTK("nicstar%d: Incomplete CS-PDU transmitted.\n",
1088                          card->index);
1089         }
1090
1091         /* Transmit Status Queue 7/8 full */
1092         if (stat_r & NS_STAT_TSQF) {
1093                 writel(NS_STAT_TSQF, card->membase + STAT);
1094                 PRINTK("nicstar%d: TSQ full.\n", card->index);
1095                 process_tsq(card);
1096         }
1097
1098         /* Timer overflow */
1099         if (stat_r & NS_STAT_TMROF) {
1100                 writel(NS_STAT_TMROF, card->membase + STAT);
1101                 PRINTK("nicstar%d: Timer overflow.\n", card->index);
1102         }
1103
1104         /* PHY device interrupt signal active */
1105         if (stat_r & NS_STAT_PHYI) {
1106                 writel(NS_STAT_PHYI, card->membase + STAT);
1107                 PRINTK("nicstar%d: PHY interrupt.\n", card->index);
1108                 if (dev->phy && dev->phy->interrupt) {
1109                         dev->phy->interrupt(dev);
1110                 }
1111         }
1112
1113         /* Small Buffer Queue is full */
1114         if (stat_r & NS_STAT_SFBQF) {
1115                 writel(NS_STAT_SFBQF, card->membase + STAT);
1116                 printk("nicstar%d: Small free buffer queue is full.\n",
1117                        card->index);
1118         }
1119
1120         /* Large Buffer Queue is full */
1121         if (stat_r & NS_STAT_LFBQF) {
1122                 writel(NS_STAT_LFBQF, card->membase + STAT);
1123                 printk("nicstar%d: Large free buffer queue is full.\n",
1124                        card->index);
1125         }
1126
1127         /* Receive Status Queue is full */
1128         if (stat_r & NS_STAT_RSQF) {
1129                 writel(NS_STAT_RSQF, card->membase + STAT);
1130                 printk("nicstar%d: RSQ full.\n", card->index);
1131                 process_rsq(card);
1132         }
1133
1134         /* Complete CS-PDU received */
1135         if (stat_r & NS_STAT_EOPDU) {
1136                 RXPRINTK("nicstar%d: End of CS-PDU received.\n", card->index);
1137                 process_rsq(card);
1138                 writel(NS_STAT_EOPDU, card->membase + STAT);
1139         }
1140
1141         /* Raw cell received */
1142         if (stat_r & NS_STAT_RAWCF) {
1143                 writel(NS_STAT_RAWCF, card->membase + STAT);
1144 #ifndef RCQ_SUPPORT
1145                 printk("nicstar%d: Raw cell received and no support yet...\n",
1146                        card->index);
1147 #endif /* RCQ_SUPPORT */
1148                 /* NOTE: the following procedure may keep a raw cell pending until the
1149                    next interrupt. As this preliminary support is only meant to
1150                    avoid buffer leakage, this is not an issue. */
1151                 while (readl(card->membase + RAWCT) != card->rawch) {
1152
1153                         if (ns_rcqe_islast(card->rawcell)) {
1154                                 struct sk_buff *oldbuf;
1155
1156                                 oldbuf = card->rcbuf;
1157                                 card->rcbuf = idr_find(&card->idr,
1158                                                        ns_rcqe_nextbufhandle(card->rawcell));
1159                                 card->rawch = NS_PRV_DMA(card->rcbuf);
1160                                 card->rawcell = (struct ns_rcqe *)
1161                                                 card->rcbuf->data;
1162                                 recycle_rx_buf(card, oldbuf);
1163                         } else {
1164                                 card->rawch += NS_RCQE_SIZE;
1165                                 card->rawcell++;
1166                         }
1167                 }
1168         }
1169
1170         /* Small buffer queue is empty */
1171         if (stat_r & NS_STAT_SFBQE) {
1172                 int i;
1173                 struct sk_buff *sb;
1174
1175                 writel(NS_STAT_SFBQE, card->membase + STAT);
1176                 printk("nicstar%d: Small free buffer queue empty.\n",
1177                        card->index);
1178                 for (i = 0; i < card->sbnr.min; i++) {
1179                         sb = dev_alloc_skb(NS_SMSKBSIZE);
1180                         if (sb == NULL) {
1181                                 writel(readl(card->membase + CFG) &
1182                                        ~NS_CFG_EFBIE, card->membase + CFG);
1183                                 card->efbie = 0;
1184                                 break;
1185                         }
1186                         NS_PRV_BUFTYPE(sb) = BUF_SM;
1187                         skb_queue_tail(&card->sbpool.queue, sb);
1188                         skb_reserve(sb, NS_AAL0_HEADER);
1189                         push_rxbufs(card, sb);
1190                 }
1191                 card->sbfqc = i;
1192                 process_rsq(card);
1193         }
1194
1195         /* Large buffer queue empty */
1196         if (stat_r & NS_STAT_LFBQE) {
1197                 int i;
1198                 struct sk_buff *lb;
1199
1200                 writel(NS_STAT_LFBQE, card->membase + STAT);
1201                 printk("nicstar%d: Large free buffer queue empty.\n",
1202                        card->index);
1203                 for (i = 0; i < card->lbnr.min; i++) {
1204                         lb = dev_alloc_skb(NS_LGSKBSIZE);
1205                         if (lb == NULL) {
1206                                 writel(readl(card->membase + CFG) &
1207                                        ~NS_CFG_EFBIE, card->membase + CFG);
1208                                 card->efbie = 0;
1209                                 break;
1210                         }
1211                         NS_PRV_BUFTYPE(lb) = BUF_LG;
1212                         skb_queue_tail(&card->lbpool.queue, lb);
1213                         skb_reserve(lb, NS_SMBUFSIZE);
1214                         push_rxbufs(card, lb);
1215                 }
1216                 card->lbfqc = i;
1217                 process_rsq(card);
1218         }
1219
1220         /* Receive Status Queue is 7/8 full */
1221         if (stat_r & NS_STAT_RSQAF) {
1222                 writel(NS_STAT_RSQAF, card->membase + STAT);
1223                 RXPRINTK("nicstar%d: RSQ almost full.\n", card->index);
1224                 process_rsq(card);
1225         }
1226
1227         spin_unlock_irqrestore(&card->int_lock, flags);
1228         PRINTK("nicstar%d: end of interrupt service\n", card->index);
1229         return IRQ_HANDLED;
1230 }
1231
1232 static int ns_open(struct atm_vcc *vcc)
1233 {
1234         ns_dev *card;
1235         vc_map *vc;
1236         unsigned long tmpl, modl;
1237         int tcr, tcra;          /* target cell rate, and absolute value */
1238         int n = 0;              /* Number of entries in the TST. Initialized to remove
1239                                    the compiler warning. */
1240         u32 u32d[4];
1241         int frscdi = 0;         /* Index of the SCD. Initialized to remove the compiler
1242                                    warning. How I wish compilers were clever enough to
1243                                    tell which variables can truly be used
1244                                    uninitialized... */
1245         int inuse;              /* tx or rx vc already in use by another vcc */
1246         short vpi = vcc->vpi;
1247         int vci = vcc->vci;
1248
1249         card = (ns_dev *) vcc->dev->dev_data;
1250         PRINTK("nicstar%d: opening vpi.vci %d.%d \n", card->index, (int)vpi,
1251                vci);
1252         if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0) {
1253                 PRINTK("nicstar%d: unsupported AAL.\n", card->index);
1254                 return -EINVAL;
1255         }
1256
1257         vc = &(card->vcmap[vpi << card->vcibits | vci]);
1258         vcc->dev_data = vc;
1259
1260         inuse = 0;
1261         if (vcc->qos.txtp.traffic_class != ATM_NONE && vc->tx)
1262                 inuse = 1;
1263         if (vcc->qos.rxtp.traffic_class != ATM_NONE && vc->rx)
1264                 inuse += 2;
1265         if (inuse) {
1266                 printk("nicstar%d: %s vci already in use.\n", card->index,
1267                        inuse == 1 ? "tx" : inuse == 2 ? "rx" : "tx and rx");
1268                 return -EINVAL;
1269         }
1270
1271         set_bit(ATM_VF_ADDR, &vcc->flags);
1272
1273         /* NOTE: You are not allowed to modify an open connection's QOS. To change
1274            that, remove the ATM_VF_PARTIAL flag checking. There may be other changes
1275            needed to do that. */
1276         if (!test_bit(ATM_VF_PARTIAL, &vcc->flags)) {
1277                 scq_info *scq;
1278
1279                 set_bit(ATM_VF_PARTIAL, &vcc->flags);
1280                 if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1281                         /* Check requested cell rate and availability of SCD */
1282                         if (vcc->qos.txtp.max_pcr == 0 && vcc->qos.txtp.pcr == 0
1283                             && vcc->qos.txtp.min_pcr == 0) {
1284                                 PRINTK
1285                                     ("nicstar%d: trying to open a CBR vc with cell rate = 0 \n",
1286                                      card->index);
1287                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1288                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1289                                 return -EINVAL;
1290                         }
1291
1292                         tcr = atm_pcr_goal(&(vcc->qos.txtp));
1293                         tcra = tcr >= 0 ? tcr : -tcr;
1294
1295                         PRINTK("nicstar%d: target cell rate = %d.\n",
1296                                card->index, vcc->qos.txtp.max_pcr);
1297
1298                         tmpl =
1299                             (unsigned long)tcra *(unsigned long)
1300                             NS_TST_NUM_ENTRIES;
1301                         modl = tmpl % card->max_pcr;
1302
1303                         n = (int)(tmpl / card->max_pcr);
1304                         if (tcr > 0) {
1305                                 if (modl > 0)
1306                                         n++;
1307                         } else if (tcr == 0) {
1308                                 if ((n =
1309                                      (card->tst_free_entries -
1310                                       NS_TST_RESERVED)) <= 0) {
1311                                         PRINTK
1312                                             ("nicstar%d: no CBR bandwidth free.\n",
1313                                              card->index);
1314                                         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1315                                         clear_bit(ATM_VF_ADDR, &vcc->flags);
1316                                         return -EINVAL;
1317                                 }
1318                         }
1319
1320                         if (n == 0) {
1321                                 printk
1322                                     ("nicstar%d: selected bandwidth < granularity.\n",
1323                                      card->index);
1324                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1325                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1326                                 return -EINVAL;
1327                         }
1328
1329                         if (n > (card->tst_free_entries - NS_TST_RESERVED)) {
1330                                 PRINTK
1331                                     ("nicstar%d: not enough free CBR bandwidth.\n",
1332                                      card->index);
1333                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1334                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1335                                 return -EINVAL;
1336                         } else
1337                                 card->tst_free_entries -= n;
1338
1339                         XPRINTK("nicstar%d: writing %d tst entries.\n",
1340                                 card->index, n);
1341                         for (frscdi = 0; frscdi < NS_FRSCD_NUM; frscdi++) {
1342                                 if (card->scd2vc[frscdi] == NULL) {
1343                                         card->scd2vc[frscdi] = vc;
1344                                         break;
1345                                 }
1346                         }
1347                         if (frscdi == NS_FRSCD_NUM) {
1348                                 PRINTK
1349                                     ("nicstar%d: no SCD available for CBR channel.\n",
1350                                      card->index);
1351                                 card->tst_free_entries += n;
1352                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1353                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1354                                 return -EBUSY;
1355                         }
1356
1357                         vc->cbr_scd = NS_FRSCD + frscdi * NS_FRSCD_SIZE;
1358
1359                         scq = get_scq(card, CBR_SCQSIZE, vc->cbr_scd);
1360                         if (scq == NULL) {
1361                                 PRINTK("nicstar%d: can't get fixed rate SCQ.\n",
1362                                        card->index);
1363                                 card->scd2vc[frscdi] = NULL;
1364                                 card->tst_free_entries += n;
1365                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1366                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1367                                 return -ENOMEM;
1368                         }
1369                         vc->scq = scq;
1370                         u32d[0] = scq_virt_to_bus(scq, scq->base);
1371                         u32d[1] = (u32) 0x00000000;
1372                         u32d[2] = (u32) 0xffffffff;
1373                         u32d[3] = (u32) 0x00000000;
1374                         ns_write_sram(card, vc->cbr_scd, u32d, 4);
1375
1376                         fill_tst(card, n, vc);
1377                 } else if (vcc->qos.txtp.traffic_class == ATM_UBR) {
1378                         vc->cbr_scd = 0x00000000;
1379                         vc->scq = card->scq0;
1380                 }
1381
1382                 if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1383                         vc->tx = 1;
1384                         vc->tx_vcc = vcc;
1385                         vc->tbd_count = 0;
1386                 }
1387                 if (vcc->qos.rxtp.traffic_class != ATM_NONE) {
1388                         u32 status;
1389
1390                         vc->rx = 1;
1391                         vc->rx_vcc = vcc;
1392                         vc->rx_iov = NULL;
1393
1394                         /* Open the connection in hardware */
1395                         if (vcc->qos.aal == ATM_AAL5)
1396                                 status = NS_RCTE_AAL5 | NS_RCTE_CONNECTOPEN;
1397                         else    /* vcc->qos.aal == ATM_AAL0 */
1398                                 status = NS_RCTE_AAL0 | NS_RCTE_CONNECTOPEN;
1399 #ifdef RCQ_SUPPORT
1400                         status |= NS_RCTE_RAWCELLINTEN;
1401 #endif /* RCQ_SUPPORT */
1402                         ns_write_sram(card,
1403                                       NS_RCT +
1404                                       (vpi << card->vcibits | vci) *
1405                                       NS_RCT_ENTRY_SIZE, &status, 1);
1406                 }
1407
1408         }
1409
1410         set_bit(ATM_VF_READY, &vcc->flags);
1411         return 0;
1412 }
1413
1414 static void ns_close(struct atm_vcc *vcc)
1415 {
1416         vc_map *vc;
1417         ns_dev *card;
1418         u32 data;
1419         int i;
1420
1421         vc = vcc->dev_data;
1422         card = vcc->dev->dev_data;
1423         PRINTK("nicstar%d: closing vpi.vci %d.%d \n", card->index,
1424                (int)vcc->vpi, vcc->vci);
1425
1426         clear_bit(ATM_VF_READY, &vcc->flags);
1427
1428         if (vcc->qos.rxtp.traffic_class != ATM_NONE) {
1429                 u32 addr;
1430                 unsigned long flags;
1431
1432                 addr =
1433                     NS_RCT +
1434                     (vcc->vpi << card->vcibits | vcc->vci) * NS_RCT_ENTRY_SIZE;
1435                 spin_lock_irqsave(&card->res_lock, flags);
1436                 while (CMD_BUSY(card)) ;
1437                 writel(NS_CMD_CLOSE_CONNECTION | addr << 2,
1438                        card->membase + CMD);
1439                 spin_unlock_irqrestore(&card->res_lock, flags);
1440
1441                 vc->rx = 0;
1442                 if (vc->rx_iov != NULL) {
1443                         struct sk_buff *iovb;
1444                         u32 stat;
1445
1446                         stat = readl(card->membase + STAT);
1447                         card->sbfqc = ns_stat_sfbqc_get(stat);
1448                         card->lbfqc = ns_stat_lfbqc_get(stat);
1449
1450                         PRINTK
1451                             ("nicstar%d: closing a VC with pending rx buffers.\n",
1452                              card->index);
1453                         iovb = vc->rx_iov;
1454                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
1455                                               NS_PRV_IOVCNT(iovb));
1456                         NS_PRV_IOVCNT(iovb) = 0;
1457                         spin_lock_irqsave(&card->int_lock, flags);
1458                         recycle_iov_buf(card, iovb);
1459                         spin_unlock_irqrestore(&card->int_lock, flags);
1460                         vc->rx_iov = NULL;
1461                 }
1462         }
1463
1464         if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1465                 vc->tx = 0;
1466         }
1467
1468         if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1469                 unsigned long flags;
1470                 ns_scqe *scqep;
1471                 scq_info *scq;
1472
1473                 scq = vc->scq;
1474
1475                 for (;;) {
1476                         spin_lock_irqsave(&scq->lock, flags);
1477                         scqep = scq->next;
1478                         if (scqep == scq->base)
1479                                 scqep = scq->last;
1480                         else
1481                                 scqep--;
1482                         if (scqep == scq->tail) {
1483                                 spin_unlock_irqrestore(&scq->lock, flags);
1484                                 break;
1485                         }
1486                         /* If the last entry is not a TSR, place one in the SCQ in order to
1487                            be able to completely drain it and then close. */
1488                         if (!ns_scqe_is_tsr(scqep) && scq->tail != scq->next) {
1489                                 ns_scqe tsr;
1490                                 u32 scdi, scqi;
1491                                 u32 data;
1492                                 int index;
1493
1494                                 tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
1495                                 scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
1496                                 scqi = scq->next - scq->base;
1497                                 tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
1498                                 tsr.word_3 = 0x00000000;
1499                                 tsr.word_4 = 0x00000000;
1500                                 *scq->next = tsr;
1501                                 index = (int)scqi;
1502                                 scq->skb[index] = NULL;
1503                                 if (scq->next == scq->last)
1504                                         scq->next = scq->base;
1505                                 else
1506                                         scq->next++;
1507                                 data = scq_virt_to_bus(scq, scq->next);
1508                                 ns_write_sram(card, scq->scd, &data, 1);
1509                         }
1510                         spin_unlock_irqrestore(&scq->lock, flags);
1511                         schedule();
1512                 }
1513
1514                 /* Free all TST entries */
1515                 data = NS_TST_OPCODE_VARIABLE;
1516                 for (i = 0; i < NS_TST_NUM_ENTRIES; i++) {
1517                         if (card->tste2vc[i] == vc) {
1518                                 ns_write_sram(card, card->tst_addr + i, &data,
1519                                               1);
1520                                 card->tste2vc[i] = NULL;
1521                                 card->tst_free_entries++;
1522                         }
1523                 }
1524
1525                 card->scd2vc[(vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE] = NULL;
1526                 free_scq(card, vc->scq, vcc);
1527         }
1528
1529         /* remove all references to vcc before deleting it */
1530         if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1531                 unsigned long flags;
1532                 scq_info *scq = card->scq0;
1533
1534                 spin_lock_irqsave(&scq->lock, flags);
1535
1536                 for (i = 0; i < scq->num_entries; i++) {
1537                         if (scq->skb[i] && ATM_SKB(scq->skb[i])->vcc == vcc) {
1538                                 ATM_SKB(scq->skb[i])->vcc = NULL;
1539                                 atm_return(vcc, scq->skb[i]->truesize);
1540                                 PRINTK
1541                                     ("nicstar: deleted pending vcc mapping\n");
1542                         }
1543                 }
1544
1545                 spin_unlock_irqrestore(&scq->lock, flags);
1546         }
1547
1548         vcc->dev_data = NULL;
1549         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1550         clear_bit(ATM_VF_ADDR, &vcc->flags);
1551
1552 #ifdef RX_DEBUG
1553         {
1554                 u32 stat, cfg;
1555                 stat = readl(card->membase + STAT);
1556                 cfg = readl(card->membase + CFG);
1557                 printk("STAT = 0x%08X  CFG = 0x%08X  \n", stat, cfg);
1558                 printk
1559                     ("TSQ: base = 0x%p  next = 0x%p  last = 0x%p  TSQT = 0x%08X \n",
1560                      card->tsq.base, card->tsq.next,
1561                      card->tsq.last, readl(card->membase + TSQT));
1562                 printk
1563                     ("RSQ: base = 0x%p  next = 0x%p  last = 0x%p  RSQT = 0x%08X \n",
1564                      card->rsq.base, card->rsq.next,
1565                      card->rsq.last, readl(card->membase + RSQT));
1566                 printk("Empty free buffer queue interrupt %s \n",
1567                        card->efbie ? "enabled" : "disabled");
1568                 printk("SBCNT = %d  count = %d   LBCNT = %d count = %d \n",
1569                        ns_stat_sfbqc_get(stat), card->sbpool.count,
1570                        ns_stat_lfbqc_get(stat), card->lbpool.count);
1571                 printk("hbpool.count = %d  iovpool.count = %d \n",
1572                        card->hbpool.count, card->iovpool.count);
1573         }
1574 #endif /* RX_DEBUG */
1575 }
1576
1577 static void fill_tst(ns_dev * card, int n, vc_map * vc)
1578 {
1579         u32 new_tst;
1580         unsigned long cl;
1581         int e, r;
1582         u32 data;
1583
1584         /* It would be very complicated to keep the two TSTs synchronized while
1585            assuring that writes are only made to the inactive TST. So, for now I
1586            will use only one TST. If problems occur, I will change this again */
1587
1588         new_tst = card->tst_addr;
1589
1590         /* Fill procedure */
1591
1592         for (e = 0; e < NS_TST_NUM_ENTRIES; e++) {
1593                 if (card->tste2vc[e] == NULL)
1594                         break;
1595         }
1596         if (e == NS_TST_NUM_ENTRIES) {
1597                 printk("nicstar%d: No free TST entries found. \n", card->index);
1598                 return;
1599         }
1600
1601         r = n;
1602         cl = NS_TST_NUM_ENTRIES;
1603         data = ns_tste_make(NS_TST_OPCODE_FIXED, vc->cbr_scd);
1604
1605         while (r > 0) {
1606                 if (cl >= NS_TST_NUM_ENTRIES && card->tste2vc[e] == NULL) {
1607                         card->tste2vc[e] = vc;
1608                         ns_write_sram(card, new_tst + e, &data, 1);
1609                         cl -= NS_TST_NUM_ENTRIES;
1610                         r--;
1611                 }
1612
1613                 if (++e == NS_TST_NUM_ENTRIES) {
1614                         e = 0;
1615                 }
1616                 cl += n;
1617         }
1618
1619         /* End of fill procedure */
1620
1621         data = ns_tste_make(NS_TST_OPCODE_END, new_tst);
1622         ns_write_sram(card, new_tst + NS_TST_NUM_ENTRIES, &data, 1);
1623         ns_write_sram(card, card->tst_addr + NS_TST_NUM_ENTRIES, &data, 1);
1624         card->tst_addr = new_tst;
1625 }
1626
1627 static int _ns_send(struct atm_vcc *vcc, struct sk_buff *skb, bool may_sleep)
1628 {
1629         ns_dev *card;
1630         vc_map *vc;
1631         scq_info *scq;
1632         unsigned long buflen;
1633         ns_scqe scqe;
1634         u32 flags;              /* TBD flags, not CPU flags */
1635
1636         card = vcc->dev->dev_data;
1637         TXPRINTK("nicstar%d: ns_send() called.\n", card->index);
1638         if ((vc = (vc_map *) vcc->dev_data) == NULL) {
1639                 printk("nicstar%d: vcc->dev_data == NULL on ns_send().\n",
1640                        card->index);
1641                 atomic_inc(&vcc->stats->tx_err);
1642                 dev_kfree_skb_any(skb);
1643                 return -EINVAL;
1644         }
1645
1646         if (!vc->tx) {
1647                 printk("nicstar%d: Trying to transmit on a non-tx VC.\n",
1648                        card->index);
1649                 atomic_inc(&vcc->stats->tx_err);
1650                 dev_kfree_skb_any(skb);
1651                 return -EINVAL;
1652         }
1653
1654         if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0) {
1655                 printk("nicstar%d: Only AAL0 and AAL5 are supported.\n",
1656                        card->index);
1657                 atomic_inc(&vcc->stats->tx_err);
1658                 dev_kfree_skb_any(skb);
1659                 return -EINVAL;
1660         }
1661
1662         if (skb_shinfo(skb)->nr_frags != 0) {
1663                 printk("nicstar%d: No scatter-gather yet.\n", card->index);
1664                 atomic_inc(&vcc->stats->tx_err);
1665                 dev_kfree_skb_any(skb);
1666                 return -EINVAL;
1667         }
1668
1669         ATM_SKB(skb)->vcc = vcc;
1670
1671         NS_PRV_DMA(skb) = dma_map_single(&card->pcidev->dev, skb->data,
1672                                          skb->len, DMA_TO_DEVICE);
1673
1674         if (vcc->qos.aal == ATM_AAL5) {
1675                 buflen = (skb->len + 47 + 8) / 48 * 48; /* Multiple of 48 */
1676                 flags = NS_TBD_AAL5;
1677                 scqe.word_2 = cpu_to_le32(NS_PRV_DMA(skb));
1678                 scqe.word_3 = cpu_to_le32(skb->len);
1679                 scqe.word_4 =
1680                     ns_tbd_mkword_4(0, (u32) vcc->vpi, (u32) vcc->vci, 0,
1681                                     ATM_SKB(skb)->
1682                                     atm_options & ATM_ATMOPT_CLP ? 1 : 0);
1683                 flags |= NS_TBD_EOPDU;
1684         } else {                /* (vcc->qos.aal == ATM_AAL0) */
1685
1686                 buflen = ATM_CELL_PAYLOAD;      /* i.e., 48 bytes */
1687                 flags = NS_TBD_AAL0;
1688                 scqe.word_2 = cpu_to_le32(NS_PRV_DMA(skb) + NS_AAL0_HEADER);
1689                 scqe.word_3 = cpu_to_le32(0x00000000);
1690                 if (*skb->data & 0x02)  /* Payload type 1 - end of pdu */
1691                         flags |= NS_TBD_EOPDU;
1692                 scqe.word_4 =
1693                     cpu_to_le32(*((u32 *) skb->data) & ~NS_TBD_VC_MASK);
1694                 /* Force the VPI/VCI to be the same as in VCC struct */
1695                 scqe.word_4 |=
1696                     cpu_to_le32((((u32) vcc->
1697                                   vpi) << NS_TBD_VPI_SHIFT | ((u32) vcc->
1698                                                               vci) <<
1699                                  NS_TBD_VCI_SHIFT) & NS_TBD_VC_MASK);
1700         }
1701
1702         if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1703                 scqe.word_1 = ns_tbd_mkword_1_novbr(flags, (u32) buflen);
1704                 scq = ((vc_map *) vcc->dev_data)->scq;
1705         } else {
1706                 scqe.word_1 =
1707                     ns_tbd_mkword_1(flags, (u32) 1, (u32) 1, (u32) buflen);
1708                 scq = card->scq0;
1709         }
1710
1711         if (push_scqe(card, vc, scq, &scqe, skb, may_sleep) != 0) {
1712                 atomic_inc(&vcc->stats->tx_err);
1713                 dma_unmap_single(&card->pcidev->dev, NS_PRV_DMA(skb), skb->len,
1714                                  DMA_TO_DEVICE);
1715                 dev_kfree_skb_any(skb);
1716                 return -EIO;
1717         }
1718         atomic_inc(&vcc->stats->tx);
1719
1720         return 0;
1721 }
1722
1723 static int ns_send(struct atm_vcc *vcc, struct sk_buff *skb)
1724 {
1725         return _ns_send(vcc, skb, true);
1726 }
1727
1728 static int ns_send_bh(struct atm_vcc *vcc, struct sk_buff *skb)
1729 {
1730         return _ns_send(vcc, skb, false);
1731 }
1732
1733 static int push_scqe(ns_dev * card, vc_map * vc, scq_info * scq, ns_scqe * tbd,
1734                      struct sk_buff *skb, bool may_sleep)
1735 {
1736         unsigned long flags;
1737         ns_scqe tsr;
1738         u32 scdi, scqi;
1739         int scq_is_vbr;
1740         u32 data;
1741         int index;
1742
1743         spin_lock_irqsave(&scq->lock, flags);
1744         while (scq->tail == scq->next) {
1745                 if (!may_sleep) {
1746                         spin_unlock_irqrestore(&scq->lock, flags);
1747                         printk("nicstar%d: Error pushing TBD.\n", card->index);
1748                         return 1;
1749                 }
1750
1751                 scq->full = 1;
1752                 wait_event_interruptible_lock_irq_timeout(scq->scqfull_waitq,
1753                                                           scq->tail != scq->next,
1754                                                           scq->lock,
1755                                                           SCQFULL_TIMEOUT);
1756
1757                 if (scq->full) {
1758                         spin_unlock_irqrestore(&scq->lock, flags);
1759                         printk("nicstar%d: Timeout pushing TBD.\n",
1760                                card->index);
1761                         return 1;
1762                 }
1763         }
1764         *scq->next = *tbd;
1765         index = (int)(scq->next - scq->base);
1766         scq->skb[index] = skb;
1767         XPRINTK("nicstar%d: sending skb at 0x%p (pos %d).\n",
1768                 card->index, skb, index);
1769         XPRINTK("nicstar%d: TBD written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%p.\n",
1770                 card->index, le32_to_cpu(tbd->word_1), le32_to_cpu(tbd->word_2),
1771                 le32_to_cpu(tbd->word_3), le32_to_cpu(tbd->word_4),
1772                 scq->next);
1773         if (scq->next == scq->last)
1774                 scq->next = scq->base;
1775         else
1776                 scq->next++;
1777
1778         vc->tbd_count++;
1779         if (scq->num_entries == VBR_SCQ_NUM_ENTRIES) {
1780                 scq->tbd_count++;
1781                 scq_is_vbr = 1;
1782         } else
1783                 scq_is_vbr = 0;
1784
1785         if (vc->tbd_count >= MAX_TBD_PER_VC
1786             || scq->tbd_count >= MAX_TBD_PER_SCQ) {
1787                 int has_run = 0;
1788
1789                 while (scq->tail == scq->next) {
1790                         if (!may_sleep) {
1791                                 data = scq_virt_to_bus(scq, scq->next);
1792                                 ns_write_sram(card, scq->scd, &data, 1);
1793                                 spin_unlock_irqrestore(&scq->lock, flags);
1794                                 printk("nicstar%d: Error pushing TSR.\n",
1795                                        card->index);
1796                                 return 0;
1797                         }
1798
1799                         scq->full = 1;
1800                         if (has_run++)
1801                                 break;
1802                         wait_event_interruptible_lock_irq_timeout(scq->scqfull_waitq,
1803                                                                   scq->tail != scq->next,
1804                                                                   scq->lock,
1805                                                                   SCQFULL_TIMEOUT);
1806                 }
1807
1808                 if (!scq->full) {
1809                         tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
1810                         if (scq_is_vbr)
1811                                 scdi = NS_TSR_SCDISVBR;
1812                         else
1813                                 scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
1814                         scqi = scq->next - scq->base;
1815                         tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
1816                         tsr.word_3 = 0x00000000;
1817                         tsr.word_4 = 0x00000000;
1818
1819                         *scq->next = tsr;
1820                         index = (int)scqi;
1821                         scq->skb[index] = NULL;
1822                         XPRINTK
1823                             ("nicstar%d: TSR written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%p.\n",
1824                              card->index, le32_to_cpu(tsr.word_1),
1825                              le32_to_cpu(tsr.word_2), le32_to_cpu(tsr.word_3),
1826                              le32_to_cpu(tsr.word_4), scq->next);
1827                         if (scq->next == scq->last)
1828                                 scq->next = scq->base;
1829                         else
1830                                 scq->next++;
1831                         vc->tbd_count = 0;
1832                         scq->tbd_count = 0;
1833                 } else
1834                         PRINTK("nicstar%d: Timeout pushing TSR.\n",
1835                                card->index);
1836         }
1837         data = scq_virt_to_bus(scq, scq->next);
1838         ns_write_sram(card, scq->scd, &data, 1);
1839
1840         spin_unlock_irqrestore(&scq->lock, flags);
1841
1842         return 0;
1843 }
1844
1845 static void process_tsq(ns_dev * card)
1846 {
1847         u32 scdi;
1848         scq_info *scq;
1849         ns_tsi *previous = NULL, *one_ahead, *two_ahead;
1850         int serviced_entries;   /* flag indicating at least on entry was serviced */
1851
1852         serviced_entries = 0;
1853
1854         if (card->tsq.next == card->tsq.last)
1855                 one_ahead = card->tsq.base;
1856         else
1857                 one_ahead = card->tsq.next + 1;
1858
1859         if (one_ahead == card->tsq.last)
1860                 two_ahead = card->tsq.base;
1861         else
1862                 two_ahead = one_ahead + 1;
1863
1864         while (!ns_tsi_isempty(card->tsq.next) || !ns_tsi_isempty(one_ahead) ||
1865                !ns_tsi_isempty(two_ahead))
1866                 /* At most two empty, as stated in the 77201 errata */
1867         {
1868                 serviced_entries = 1;
1869
1870                 /* Skip the one or two possible empty entries */
1871                 while (ns_tsi_isempty(card->tsq.next)) {
1872                         if (card->tsq.next == card->tsq.last)
1873                                 card->tsq.next = card->tsq.base;
1874                         else
1875                                 card->tsq.next++;
1876                 }
1877
1878                 if (!ns_tsi_tmrof(card->tsq.next)) {
1879                         scdi = ns_tsi_getscdindex(card->tsq.next);
1880                         if (scdi == NS_TSI_SCDISVBR)
1881                                 scq = card->scq0;
1882                         else {
1883                                 if (card->scd2vc[scdi] == NULL) {
1884                                         printk
1885                                             ("nicstar%d: could not find VC from SCD index.\n",
1886                                              card->index);
1887                                         ns_tsi_init(card->tsq.next);
1888                                         return;
1889                                 }
1890                                 scq = card->scd2vc[scdi]->scq;
1891                         }
1892                         drain_scq(card, scq, ns_tsi_getscqpos(card->tsq.next));
1893                         scq->full = 0;
1894                         wake_up_interruptible(&(scq->scqfull_waitq));
1895                 }
1896
1897                 ns_tsi_init(card->tsq.next);
1898                 previous = card->tsq.next;
1899                 if (card->tsq.next == card->tsq.last)
1900                         card->tsq.next = card->tsq.base;
1901                 else
1902                         card->tsq.next++;
1903
1904                 if (card->tsq.next == card->tsq.last)
1905                         one_ahead = card->tsq.base;
1906                 else
1907                         one_ahead = card->tsq.next + 1;
1908
1909                 if (one_ahead == card->tsq.last)
1910                         two_ahead = card->tsq.base;
1911                 else
1912                         two_ahead = one_ahead + 1;
1913         }
1914
1915         if (serviced_entries)
1916                 writel(PTR_DIFF(previous, card->tsq.base),
1917                        card->membase + TSQH);
1918 }
1919
1920 static void drain_scq(ns_dev * card, scq_info * scq, int pos)
1921 {
1922         struct atm_vcc *vcc;
1923         struct sk_buff *skb;
1924         int i;
1925         unsigned long flags;
1926
1927         XPRINTK("nicstar%d: drain_scq() called, scq at 0x%p, pos %d.\n",
1928                 card->index, scq, pos);
1929         if (pos >= scq->num_entries) {
1930                 printk("nicstar%d: Bad index on drain_scq().\n", card->index);
1931                 return;
1932         }
1933
1934         spin_lock_irqsave(&scq->lock, flags);
1935         i = (int)(scq->tail - scq->base);
1936         if (++i == scq->num_entries)
1937                 i = 0;
1938         while (i != pos) {
1939                 skb = scq->skb[i];
1940                 XPRINTK("nicstar%d: freeing skb at 0x%p (index %d).\n",
1941                         card->index, skb, i);
1942                 if (skb != NULL) {
1943                         dma_unmap_single(&card->pcidev->dev,
1944                                          NS_PRV_DMA(skb),
1945                                          skb->len,
1946                                          DMA_TO_DEVICE);
1947                         vcc = ATM_SKB(skb)->vcc;
1948                         if (vcc && vcc->pop != NULL) {
1949                                 vcc->pop(vcc, skb);
1950                         } else {
1951                                 dev_kfree_skb_irq(skb);
1952                         }
1953                         scq->skb[i] = NULL;
1954                 }
1955                 if (++i == scq->num_entries)
1956                         i = 0;
1957         }
1958         scq->tail = scq->base + pos;
1959         spin_unlock_irqrestore(&scq->lock, flags);
1960 }
1961
1962 static void process_rsq(ns_dev * card)
1963 {
1964         ns_rsqe *previous;
1965
1966         if (!ns_rsqe_valid(card->rsq.next))
1967                 return;
1968         do {
1969                 dequeue_rx(card, card->rsq.next);
1970                 ns_rsqe_init(card->rsq.next);
1971                 previous = card->rsq.next;
1972                 if (card->rsq.next == card->rsq.last)
1973                         card->rsq.next = card->rsq.base;
1974                 else
1975                         card->rsq.next++;
1976         } while (ns_rsqe_valid(card->rsq.next));
1977         writel(PTR_DIFF(previous, card->rsq.base), card->membase + RSQH);
1978 }
1979
1980 static void dequeue_rx(ns_dev * card, ns_rsqe * rsqe)
1981 {
1982         u32 vpi, vci;
1983         vc_map *vc;
1984         struct sk_buff *iovb;
1985         struct iovec *iov;
1986         struct atm_vcc *vcc;
1987         struct sk_buff *skb;
1988         unsigned short aal5_len;
1989         int len;
1990         u32 stat;
1991         u32 id;
1992
1993         stat = readl(card->membase + STAT);
1994         card->sbfqc = ns_stat_sfbqc_get(stat);
1995         card->lbfqc = ns_stat_lfbqc_get(stat);
1996
1997         id = le32_to_cpu(rsqe->buffer_handle);
1998         skb = idr_remove(&card->idr, id);
1999         if (!skb) {
2000                 RXPRINTK(KERN_ERR
2001                          "nicstar%d: skb not found!\n", card->index);
2002                 return;
2003         }
2004         dma_sync_single_for_cpu(&card->pcidev->dev,
2005                                 NS_PRV_DMA(skb),
2006                                 (NS_PRV_BUFTYPE(skb) == BUF_SM
2007                                  ? NS_SMSKBSIZE : NS_LGSKBSIZE),
2008                                 DMA_FROM_DEVICE);
2009         dma_unmap_single(&card->pcidev->dev,
2010                          NS_PRV_DMA(skb),
2011                          (NS_PRV_BUFTYPE(skb) == BUF_SM
2012                           ? NS_SMSKBSIZE : NS_LGSKBSIZE),
2013                          DMA_FROM_DEVICE);
2014         vpi = ns_rsqe_vpi(rsqe);
2015         vci = ns_rsqe_vci(rsqe);
2016         if (vpi >= 1UL << card->vpibits || vci >= 1UL << card->vcibits) {
2017                 printk("nicstar%d: SDU received for out-of-range vc %d.%d.\n",
2018                        card->index, vpi, vci);
2019                 recycle_rx_buf(card, skb);
2020                 return;
2021         }
2022
2023         vc = &(card->vcmap[vpi << card->vcibits | vci]);
2024         if (!vc->rx) {
2025                 RXPRINTK("nicstar%d: SDU received on non-rx vc %d.%d.\n",
2026                          card->index, vpi, vci);
2027                 recycle_rx_buf(card, skb);
2028                 return;
2029         }
2030
2031         vcc = vc->rx_vcc;
2032
2033         if (vcc->qos.aal == ATM_AAL0) {
2034                 struct sk_buff *sb;
2035                 unsigned char *cell;
2036                 int i;
2037
2038                 cell = skb->data;
2039                 for (i = ns_rsqe_cellcount(rsqe); i; i--) {
2040                         sb = dev_alloc_skb(NS_SMSKBSIZE);
2041                         if (!sb) {
2042                                 printk
2043                                     ("nicstar%d: Can't allocate buffers for aal0.\n",
2044                                      card->index);
2045                                 atomic_add(i, &vcc->stats->rx_drop);
2046                                 break;
2047                         }
2048                         if (!atm_charge(vcc, sb->truesize)) {
2049                                 RXPRINTK
2050                                     ("nicstar%d: atm_charge() dropped aal0 packets.\n",
2051                                      card->index);
2052                                 atomic_add(i - 1, &vcc->stats->rx_drop);        /* already increased by 1 */
2053                                 dev_kfree_skb_any(sb);
2054                                 break;
2055                         }
2056                         /* Rebuild the header */
2057                         *((u32 *) sb->data) = le32_to_cpu(rsqe->word_1) << 4 |
2058                             (ns_rsqe_clp(rsqe) ? 0x00000001 : 0x00000000);
2059                         if (i == 1 && ns_rsqe_eopdu(rsqe))
2060                                 *((u32 *) sb->data) |= 0x00000002;
2061                         skb_put(sb, NS_AAL0_HEADER);
2062                         memcpy(skb_tail_pointer(sb), cell, ATM_CELL_PAYLOAD);
2063                         skb_put(sb, ATM_CELL_PAYLOAD);
2064                         ATM_SKB(sb)->vcc = vcc;
2065                         __net_timestamp(sb);
2066                         vcc->push(vcc, sb);
2067                         atomic_inc(&vcc->stats->rx);
2068                         cell += ATM_CELL_PAYLOAD;
2069                 }
2070
2071                 recycle_rx_buf(card, skb);
2072                 return;
2073         }
2074
2075         /* To reach this point, the AAL layer can only be AAL5 */
2076
2077         if ((iovb = vc->rx_iov) == NULL) {
2078                 iovb = skb_dequeue(&(card->iovpool.queue));
2079                 if (iovb == NULL) {     /* No buffers in the queue */
2080                         iovb = alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC);
2081                         if (iovb == NULL) {
2082                                 printk("nicstar%d: Out of iovec buffers.\n",
2083                                        card->index);
2084                                 atomic_inc(&vcc->stats->rx_drop);
2085                                 recycle_rx_buf(card, skb);
2086                                 return;
2087                         }
2088                         NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2089                 } else if (--card->iovpool.count < card->iovnr.min) {
2090                         struct sk_buff *new_iovb;
2091                         if ((new_iovb =
2092                              alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC)) != NULL) {
2093                                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2094                                 skb_queue_tail(&card->iovpool.queue, new_iovb);
2095                                 card->iovpool.count++;
2096                         }
2097                 }
2098                 vc->rx_iov = iovb;
2099                 NS_PRV_IOVCNT(iovb) = 0;
2100                 iovb->len = 0;
2101                 iovb->data = iovb->head;
2102                 skb_reset_tail_pointer(iovb);
2103                 /* IMPORTANT: a pointer to the sk_buff containing the small or large
2104                    buffer is stored as iovec base, NOT a pointer to the
2105                    small or large buffer itself. */
2106         } else if (NS_PRV_IOVCNT(iovb) >= NS_MAX_IOVECS) {
2107                 printk("nicstar%d: received too big AAL5 SDU.\n", card->index);
2108                 atomic_inc(&vcc->stats->rx_err);
2109                 recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2110                                       NS_MAX_IOVECS);
2111                 NS_PRV_IOVCNT(iovb) = 0;
2112                 iovb->len = 0;
2113                 iovb->data = iovb->head;
2114                 skb_reset_tail_pointer(iovb);
2115         }
2116         iov = &((struct iovec *)iovb->data)[NS_PRV_IOVCNT(iovb)++];
2117         iov->iov_base = (void *)skb;
2118         iov->iov_len = ns_rsqe_cellcount(rsqe) * 48;
2119         iovb->len += iov->iov_len;
2120
2121 #ifdef EXTRA_DEBUG
2122         if (NS_PRV_IOVCNT(iovb) == 1) {
2123                 if (NS_PRV_BUFTYPE(skb) != BUF_SM) {
2124                         printk
2125                             ("nicstar%d: Expected a small buffer, and this is not one.\n",
2126                              card->index);
2127                         which_list(card, skb);
2128                         atomic_inc(&vcc->stats->rx_err);
2129                         recycle_rx_buf(card, skb);
2130                         vc->rx_iov = NULL;
2131                         recycle_iov_buf(card, iovb);
2132                         return;
2133                 }
2134         } else {                /* NS_PRV_IOVCNT(iovb) >= 2 */
2135
2136                 if (NS_PRV_BUFTYPE(skb) != BUF_LG) {
2137                         printk
2138                             ("nicstar%d: Expected a large buffer, and this is not one.\n",
2139                              card->index);
2140                         which_list(card, skb);
2141                         atomic_inc(&vcc->stats->rx_err);
2142                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2143                                               NS_PRV_IOVCNT(iovb));
2144                         vc->rx_iov = NULL;
2145                         recycle_iov_buf(card, iovb);
2146                         return;
2147                 }
2148         }
2149 #endif /* EXTRA_DEBUG */
2150
2151         if (ns_rsqe_eopdu(rsqe)) {
2152                 /* This works correctly regardless of the endianness of the host */
2153                 unsigned char *L1L2 = (unsigned char *)
2154                                                 (skb->data + iov->iov_len - 6);
2155                 aal5_len = L1L2[0] << 8 | L1L2[1];
2156                 len = (aal5_len == 0x0000) ? 0x10000 : aal5_len;
2157                 if (ns_rsqe_crcerr(rsqe) ||
2158                     len + 8 > iovb->len || len + (47 + 8) < iovb->len) {
2159                         printk("nicstar%d: AAL5 CRC error", card->index);
2160                         if (len + 8 > iovb->len || len + (47 + 8) < iovb->len)
2161                                 printk(" - PDU size mismatch.\n");
2162                         else
2163                                 printk(".\n");
2164                         atomic_inc(&vcc->stats->rx_err);
2165                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2166                                               NS_PRV_IOVCNT(iovb));
2167                         vc->rx_iov = NULL;
2168                         recycle_iov_buf(card, iovb);
2169                         return;
2170                 }
2171
2172                 /* By this point we (hopefully) have a complete SDU without errors. */
2173
2174                 if (NS_PRV_IOVCNT(iovb) == 1) { /* Just a small buffer */
2175                         /* skb points to a small buffer */
2176                         if (!atm_charge(vcc, skb->truesize)) {
2177                                 push_rxbufs(card, skb);
2178                                 atomic_inc(&vcc->stats->rx_drop);
2179                         } else {
2180                                 skb_put(skb, len);
2181                                 dequeue_sm_buf(card, skb);
2182                                 ATM_SKB(skb)->vcc = vcc;
2183                                 __net_timestamp(skb);
2184                                 vcc->push(vcc, skb);
2185                                 atomic_inc(&vcc->stats->rx);
2186                         }
2187                 } else if (NS_PRV_IOVCNT(iovb) == 2) {  /* One small plus one large buffer */
2188                         struct sk_buff *sb;
2189
2190                         sb = (struct sk_buff *)(iov - 1)->iov_base;
2191                         /* skb points to a large buffer */
2192
2193                         if (len <= NS_SMBUFSIZE) {
2194                                 if (!atm_charge(vcc, sb->truesize)) {
2195                                         push_rxbufs(card, sb);
2196                                         atomic_inc(&vcc->stats->rx_drop);
2197                                 } else {
2198                                         skb_put(sb, len);
2199                                         dequeue_sm_buf(card, sb);
2200                                         ATM_SKB(sb)->vcc = vcc;
2201                                         __net_timestamp(sb);
2202                                         vcc->push(vcc, sb);
2203                                         atomic_inc(&vcc->stats->rx);
2204                                 }
2205
2206                                 push_rxbufs(card, skb);
2207
2208                         } else {        /* len > NS_SMBUFSIZE, the usual case */
2209
2210                                 if (!atm_charge(vcc, skb->truesize)) {
2211                                         push_rxbufs(card, skb);
2212                                         atomic_inc(&vcc->stats->rx_drop);
2213                                 } else {
2214                                         dequeue_lg_buf(card, skb);
2215                                         skb_push(skb, NS_SMBUFSIZE);
2216                                         skb_copy_from_linear_data(sb, skb->data,
2217                                                                   NS_SMBUFSIZE);
2218                                         skb_put(skb, len - NS_SMBUFSIZE);
2219                                         ATM_SKB(skb)->vcc = vcc;
2220                                         __net_timestamp(skb);
2221                                         vcc->push(vcc, skb);
2222                                         atomic_inc(&vcc->stats->rx);
2223                                 }
2224
2225                                 push_rxbufs(card, sb);
2226
2227                         }
2228
2229                 } else {        /* Must push a huge buffer */
2230
2231                         struct sk_buff *hb, *sb, *lb;
2232                         int remaining, tocopy;
2233                         int j;
2234
2235                         hb = skb_dequeue(&(card->hbpool.queue));
2236                         if (hb == NULL) {       /* No buffers in the queue */
2237
2238                                 hb = dev_alloc_skb(NS_HBUFSIZE);
2239                                 if (hb == NULL) {
2240                                         printk
2241                                             ("nicstar%d: Out of huge buffers.\n",
2242                                              card->index);
2243                                         atomic_inc(&vcc->stats->rx_drop);
2244                                         recycle_iovec_rx_bufs(card,
2245                                                               (struct iovec *)
2246                                                               iovb->data,
2247                                                               NS_PRV_IOVCNT(iovb));
2248                                         vc->rx_iov = NULL;
2249                                         recycle_iov_buf(card, iovb);
2250                                         return;
2251                                 } else if (card->hbpool.count < card->hbnr.min) {
2252                                         struct sk_buff *new_hb;
2253                                         if ((new_hb =
2254                                              dev_alloc_skb(NS_HBUFSIZE)) !=
2255                                             NULL) {
2256                                                 skb_queue_tail(&card->hbpool.
2257                                                                queue, new_hb);
2258                                                 card->hbpool.count++;
2259                                         }
2260                                 }
2261                                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
2262                         } else if (--card->hbpool.count < card->hbnr.min) {
2263                                 struct sk_buff *new_hb;
2264                                 if ((new_hb =
2265                                      dev_alloc_skb(NS_HBUFSIZE)) != NULL) {
2266                                         NS_PRV_BUFTYPE(new_hb) = BUF_NONE;
2267                                         skb_queue_tail(&card->hbpool.queue,
2268                                                        new_hb);
2269                                         card->hbpool.count++;
2270                                 }
2271                                 if (card->hbpool.count < card->hbnr.min) {
2272                                         if ((new_hb =
2273                                              dev_alloc_skb(NS_HBUFSIZE)) !=
2274                                             NULL) {
2275                                                 NS_PRV_BUFTYPE(new_hb) =
2276                                                     BUF_NONE;
2277                                                 skb_queue_tail(&card->hbpool.
2278                                                                queue, new_hb);
2279                                                 card->hbpool.count++;
2280                                         }
2281                                 }
2282                         }
2283
2284                         iov = (struct iovec *)iovb->data;
2285
2286                         if (!atm_charge(vcc, hb->truesize)) {
2287                                 recycle_iovec_rx_bufs(card, iov,
2288                                                       NS_PRV_IOVCNT(iovb));
2289                                 if (card->hbpool.count < card->hbnr.max) {
2290                                         skb_queue_tail(&card->hbpool.queue, hb);
2291                                         card->hbpool.count++;
2292                                 } else
2293                                         dev_kfree_skb_any(hb);
2294                                 atomic_inc(&vcc->stats->rx_drop);
2295                         } else {
2296                                 /* Copy the small buffer to the huge buffer */
2297                                 sb = (struct sk_buff *)iov->iov_base;
2298                                 skb_copy_from_linear_data(sb, hb->data,
2299                                                           iov->iov_len);
2300                                 skb_put(hb, iov->iov_len);
2301                                 remaining = len - iov->iov_len;
2302                                 iov++;
2303                                 /* Free the small buffer */
2304                                 push_rxbufs(card, sb);
2305
2306                                 /* Copy all large buffers to the huge buffer and free them */
2307                                 for (j = 1; j < NS_PRV_IOVCNT(iovb); j++) {
2308                                         lb = (struct sk_buff *)iov->iov_base;
2309                                         tocopy =
2310                                             min_t(int, remaining, iov->iov_len);
2311                                         skb_copy_from_linear_data(lb,
2312                                                                   skb_tail_pointer
2313                                                                   (hb), tocopy);
2314                                         skb_put(hb, tocopy);
2315                                         iov++;
2316                                         remaining -= tocopy;
2317                                         push_rxbufs(card, lb);
2318                                 }
2319 #ifdef EXTRA_DEBUG
2320                                 if (remaining != 0 || hb->len != len)
2321                                         printk
2322                                             ("nicstar%d: Huge buffer len mismatch.\n",
2323                                              card->index);
2324 #endif /* EXTRA_DEBUG */
2325                                 ATM_SKB(hb)->vcc = vcc;
2326                                 __net_timestamp(hb);
2327                                 vcc->push(vcc, hb);
2328                                 atomic_inc(&vcc->stats->rx);
2329                         }
2330                 }
2331
2332                 vc->rx_iov = NULL;
2333                 recycle_iov_buf(card, iovb);
2334         }
2335
2336 }
2337
2338 static void recycle_rx_buf(ns_dev * card, struct sk_buff *skb)
2339 {
2340         if (unlikely(NS_PRV_BUFTYPE(skb) == BUF_NONE)) {
2341                 printk("nicstar%d: What kind of rx buffer is this?\n",
2342                        card->index);
2343                 dev_kfree_skb_any(skb);
2344         } else
2345                 push_rxbufs(card, skb);
2346 }
2347
2348 static void recycle_iovec_rx_bufs(ns_dev * card, struct iovec *iov, int count)
2349 {
2350         while (count-- > 0)
2351                 recycle_rx_buf(card, (struct sk_buff *)(iov++)->iov_base);
2352 }
2353
2354 static void recycle_iov_buf(ns_dev * card, struct sk_buff *iovb)
2355 {
2356         if (card->iovpool.count < card->iovnr.max) {
2357                 skb_queue_tail(&card->iovpool.queue, iovb);
2358                 card->iovpool.count++;
2359         } else
2360                 dev_kfree_skb_any(iovb);
2361 }
2362
2363 static void dequeue_sm_buf(ns_dev * card, struct sk_buff *sb)
2364 {
2365         skb_unlink(sb, &card->sbpool.queue);
2366         if (card->sbfqc < card->sbnr.init) {
2367                 struct sk_buff *new_sb;
2368                 if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL) {
2369                         NS_PRV_BUFTYPE(new_sb) = BUF_SM;
2370                         skb_queue_tail(&card->sbpool.queue, new_sb);
2371                         skb_reserve(new_sb, NS_AAL0_HEADER);
2372                         push_rxbufs(card, new_sb);
2373                 }
2374         }
2375         if (card->sbfqc < card->sbnr.init)
2376         {
2377                 struct sk_buff *new_sb;
2378                 if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL) {
2379                         NS_PRV_BUFTYPE(new_sb) = BUF_SM;
2380                         skb_queue_tail(&card->sbpool.queue, new_sb);
2381                         skb_reserve(new_sb, NS_AAL0_HEADER);
2382                         push_rxbufs(card, new_sb);
2383                 }
2384         }
2385 }
2386
2387 static void dequeue_lg_buf(ns_dev * card, struct sk_buff *lb)
2388 {
2389         skb_unlink(lb, &card->lbpool.queue);
2390         if (card->lbfqc < card->lbnr.init) {
2391                 struct sk_buff *new_lb;
2392                 if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL) {
2393                         NS_PRV_BUFTYPE(new_lb) = BUF_LG;
2394                         skb_queue_tail(&card->lbpool.queue, new_lb);
2395                         skb_reserve(new_lb, NS_SMBUFSIZE);
2396                         push_rxbufs(card, new_lb);
2397                 }
2398         }
2399         if (card->lbfqc < card->lbnr.init)
2400         {
2401                 struct sk_buff *new_lb;
2402                 if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL) {
2403                         NS_PRV_BUFTYPE(new_lb) = BUF_LG;
2404                         skb_queue_tail(&card->lbpool.queue, new_lb);
2405                         skb_reserve(new_lb, NS_SMBUFSIZE);
2406                         push_rxbufs(card, new_lb);
2407                 }
2408         }
2409 }
2410
2411 static int ns_proc_read(struct atm_dev *dev, loff_t * pos, char *page)
2412 {
2413         u32 stat;
2414         ns_dev *card;
2415         int left;
2416
2417         left = (int)*pos;
2418         card = (ns_dev *) dev->dev_data;
2419         stat = readl(card->membase + STAT);
2420         if (!left--)
2421                 return sprintf(page, "Pool   count    min   init    max \n");
2422         if (!left--)
2423                 return sprintf(page, "Small  %5d  %5d  %5d  %5d \n",
2424                                ns_stat_sfbqc_get(stat), card->sbnr.min,
2425                                card->sbnr.init, card->sbnr.max);
2426         if (!left--)
2427                 return sprintf(page, "Large  %5d  %5d  %5d  %5d \n",
2428                                ns_stat_lfbqc_get(stat), card->lbnr.min,
2429                                card->lbnr.init, card->lbnr.max);
2430         if (!left--)
2431                 return sprintf(page, "Huge   %5d  %5d  %5d  %5d \n",
2432                                card->hbpool.count, card->hbnr.min,
2433                                card->hbnr.init, card->hbnr.max);
2434         if (!left--)
2435                 return sprintf(page, "Iovec  %5d  %5d  %5d  %5d \n",
2436                                card->iovpool.count, card->iovnr.min,
2437                                card->iovnr.init, card->iovnr.max);
2438         if (!left--) {
2439                 int retval;
2440                 retval =
2441                     sprintf(page, "Interrupt counter: %u \n", card->intcnt);
2442                 card->intcnt = 0;
2443                 return retval;
2444         }
2445 #if 0
2446         /* Dump 25.6 Mbps PHY registers */
2447         /* Now there's a 25.6 Mbps PHY driver this code isn't needed. I left it
2448            here just in case it's needed for debugging. */
2449         if (card->max_pcr == ATM_25_PCR && !left--) {
2450                 u32 phy_regs[4];
2451                 u32 i;
2452
2453                 for (i = 0; i < 4; i++) {
2454                         while (CMD_BUSY(card)) ;
2455                         writel(NS_CMD_READ_UTILITY | 0x00000200 | i,
2456                                card->membase + CMD);
2457                         while (CMD_BUSY(card)) ;
2458                         phy_regs[i] = readl(card->membase + DR0) & 0x000000FF;
2459                 }
2460
2461                 return sprintf(page, "PHY regs: 0x%02X 0x%02X 0x%02X 0x%02X \n",
2462                                phy_regs[0], phy_regs[1], phy_regs[2],
2463                                phy_regs[3]);
2464         }
2465 #endif /* 0 - Dump 25.6 Mbps PHY registers */
2466 #if 0
2467         /* Dump TST */
2468         if (left-- < NS_TST_NUM_ENTRIES) {
2469                 if (card->tste2vc[left + 1] == NULL)
2470                         return sprintf(page, "%5d - VBR/UBR \n", left + 1);
2471                 else
2472                         return sprintf(page, "%5d - %d %d \n", left + 1,
2473                                        card->tste2vc[left + 1]->tx_vcc->vpi,
2474                                        card->tste2vc[left + 1]->tx_vcc->vci);
2475         }
2476 #endif /* 0 */
2477         return 0;
2478 }
2479
2480 static int ns_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg)
2481 {
2482         ns_dev *card;
2483         pool_levels pl;
2484         long btype;
2485         unsigned long flags;
2486
2487         card = dev->dev_data;
2488         switch (cmd) {
2489         case NS_GETPSTAT:
2490                 if (get_user
2491                     (pl.buftype, &((pool_levels __user *) arg)->buftype))
2492                         return -EFAULT;
2493                 switch (pl.buftype) {
2494                 case NS_BUFTYPE_SMALL:
2495                         pl.count =
2496                             ns_stat_sfbqc_get(readl(card->membase + STAT));
2497                         pl.level.min = card->sbnr.min;
2498                         pl.level.init = card->sbnr.init;
2499                         pl.level.max = card->sbnr.max;
2500                         break;
2501
2502                 case NS_BUFTYPE_LARGE:
2503                         pl.count =
2504                             ns_stat_lfbqc_get(readl(card->membase + STAT));
2505                         pl.level.min = card->lbnr.min;
2506                         pl.level.init = card->lbnr.init;
2507                         pl.level.max = card->lbnr.max;
2508                         break;
2509
2510                 case NS_BUFTYPE_HUGE:
2511                         pl.count = card->hbpool.count;
2512                         pl.level.min = card->hbnr.min;
2513                         pl.level.init = card->hbnr.init;
2514                         pl.level.max = card->hbnr.max;
2515                         break;
2516
2517                 case NS_BUFTYPE_IOVEC:
2518                         pl.count = card->iovpool.count;
2519                         pl.level.min = card->iovnr.min;
2520                         pl.level.init = card->iovnr.init;
2521                         pl.level.max = card->iovnr.max;
2522                         break;
2523
2524                 default:
2525                         return -ENOIOCTLCMD;
2526
2527                 }
2528                 if (!copy_to_user((pool_levels __user *) arg, &pl, sizeof(pl)))
2529                         return (sizeof(pl));
2530                 else
2531                         return -EFAULT;
2532
2533         case NS_SETBUFLEV:
2534                 if (!capable(CAP_NET_ADMIN))
2535                         return -EPERM;
2536                 if (copy_from_user(&pl, (pool_levels __user *) arg, sizeof(pl)))
2537                         return -EFAULT;
2538                 if (pl.level.min >= pl.level.init
2539                     || pl.level.init >= pl.level.max)
2540                         return -EINVAL;
2541                 if (pl.level.min == 0)
2542                         return -EINVAL;
2543                 switch (pl.buftype) {
2544                 case NS_BUFTYPE_SMALL:
2545                         if (pl.level.max > TOP_SB)
2546                                 return -EINVAL;
2547                         card->sbnr.min = pl.level.min;
2548                         card->sbnr.init = pl.level.init;
2549                         card->sbnr.max = pl.level.max;
2550                         break;
2551
2552                 case NS_BUFTYPE_LARGE:
2553                         if (pl.level.max > TOP_LB)
2554                                 return -EINVAL;
2555                         card->lbnr.min = pl.level.min;
2556                         card->lbnr.init = pl.level.init;
2557                         card->lbnr.max = pl.level.max;
2558                         break;
2559
2560                 case NS_BUFTYPE_HUGE:
2561                         if (pl.level.max > TOP_HB)
2562                                 return -EINVAL;
2563                         card->hbnr.min = pl.level.min;
2564                         card->hbnr.init = pl.level.init;
2565                         card->hbnr.max = pl.level.max;
2566                         break;
2567
2568                 case NS_BUFTYPE_IOVEC:
2569                         if (pl.level.max > TOP_IOVB)
2570                                 return -EINVAL;
2571                         card->iovnr.min = pl.level.min;
2572                         card->iovnr.init = pl.level.init;
2573                         card->iovnr.max = pl.level.max;
2574                         break;
2575
2576                 default:
2577                         return -EINVAL;
2578
2579                 }
2580                 return 0;
2581
2582         case NS_ADJBUFLEV:
2583                 if (!capable(CAP_NET_ADMIN))
2584                         return -EPERM;
2585                 btype = (long)arg;      /* a long is the same size as a pointer or bigger */
2586                 switch (btype) {
2587                 case NS_BUFTYPE_SMALL:
2588                         while (card->sbfqc < card->sbnr.init) {
2589                                 struct sk_buff *sb;
2590
2591                                 sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
2592                                 if (sb == NULL)
2593                                         return -ENOMEM;
2594                                 NS_PRV_BUFTYPE(sb) = BUF_SM;
2595                                 skb_queue_tail(&card->sbpool.queue, sb);
2596                                 skb_reserve(sb, NS_AAL0_HEADER);
2597                                 push_rxbufs(card, sb);
2598                         }
2599                         break;
2600
2601                 case NS_BUFTYPE_LARGE:
2602                         while (card->lbfqc < card->lbnr.init) {
2603                                 struct sk_buff *lb;
2604
2605                                 lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
2606                                 if (lb == NULL)
2607                                         return -ENOMEM;
2608                                 NS_PRV_BUFTYPE(lb) = BUF_LG;
2609                                 skb_queue_tail(&card->lbpool.queue, lb);
2610                                 skb_reserve(lb, NS_SMBUFSIZE);
2611                                 push_rxbufs(card, lb);
2612                         }
2613                         break;
2614
2615                 case NS_BUFTYPE_HUGE:
2616                         while (card->hbpool.count > card->hbnr.init) {
2617                                 struct sk_buff *hb;
2618
2619                                 spin_lock_irqsave(&card->int_lock, flags);
2620                                 hb = skb_dequeue(&card->hbpool.queue);
2621                                 card->hbpool.count--;
2622                                 spin_unlock_irqrestore(&card->int_lock, flags);
2623                                 if (hb == NULL)
2624                                         printk
2625                                             ("nicstar%d: huge buffer count inconsistent.\n",
2626                                              card->index);
2627                                 else
2628                                         dev_kfree_skb_any(hb);
2629
2630                         }
2631                         while (card->hbpool.count < card->hbnr.init) {
2632                                 struct sk_buff *hb;
2633
2634                                 hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
2635                                 if (hb == NULL)
2636                                         return -ENOMEM;
2637                                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
2638                                 spin_lock_irqsave(&card->int_lock, flags);
2639                                 skb_queue_tail(&card->hbpool.queue, hb);
2640                                 card->hbpool.count++;
2641                                 spin_unlock_irqrestore(&card->int_lock, flags);
2642                         }
2643                         break;
2644
2645                 case NS_BUFTYPE_IOVEC:
2646                         while (card->iovpool.count > card->iovnr.init) {
2647                                 struct sk_buff *iovb;
2648
2649                                 spin_lock_irqsave(&card->int_lock, flags);
2650                                 iovb = skb_dequeue(&card->iovpool.queue);
2651                                 card->iovpool.count--;
2652                                 spin_unlock_irqrestore(&card->int_lock, flags);
2653                                 if (iovb == NULL)
2654                                         printk
2655                                             ("nicstar%d: iovec buffer count inconsistent.\n",
2656                                              card->index);
2657                                 else
2658                                         dev_kfree_skb_any(iovb);
2659
2660                         }
2661                         while (card->iovpool.count < card->iovnr.init) {
2662                                 struct sk_buff *iovb;
2663
2664                                 iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
2665                                 if (iovb == NULL)
2666                                         return -ENOMEM;
2667                                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2668                                 spin_lock_irqsave(&card->int_lock, flags);
2669                                 skb_queue_tail(&card->iovpool.queue, iovb);
2670                                 card->iovpool.count++;
2671                                 spin_unlock_irqrestore(&card->int_lock, flags);
2672                         }
2673                         break;
2674
2675                 default:
2676                         return -EINVAL;
2677
2678                 }
2679                 return 0;
2680
2681         default:
2682                 if (dev->phy && dev->phy->ioctl) {
2683                         return dev->phy->ioctl(dev, cmd, arg);
2684                 } else {
2685                         printk("nicstar%d: %s == NULL \n", card->index,
2686                                dev->phy ? "dev->phy->ioctl" : "dev->phy");
2687                         return -ENOIOCTLCMD;
2688                 }
2689         }
2690 }
2691
2692 #ifdef EXTRA_DEBUG
2693 static void which_list(ns_dev * card, struct sk_buff *skb)
2694 {
2695         printk("skb buf_type: 0x%08x\n", NS_PRV_BUFTYPE(skb));
2696 }
2697 #endif /* EXTRA_DEBUG */
2698
2699 static void ns_poll(struct timer_list *unused)
2700 {
2701         int i;
2702         ns_dev *card;
2703         unsigned long flags;
2704         u32 stat_r, stat_w;
2705
2706         PRINTK("nicstar: Entering ns_poll().\n");
2707         for (i = 0; i < num_cards; i++) {
2708                 card = cards[i];
2709                 if (!spin_trylock_irqsave(&card->int_lock, flags)) {
2710                         /* Probably it isn't worth spinning */
2711                         continue;
2712                 }
2713
2714                 stat_w = 0;
2715                 stat_r = readl(card->membase + STAT);
2716                 if (stat_r & NS_STAT_TSIF)
2717                         stat_w |= NS_STAT_TSIF;
2718                 if (stat_r & NS_STAT_EOPDU)
2719                         stat_w |= NS_STAT_EOPDU;
2720
2721                 process_tsq(card);
2722                 process_rsq(card);
2723
2724                 writel(stat_w, card->membase + STAT);
2725                 spin_unlock_irqrestore(&card->int_lock, flags);
2726         }
2727         mod_timer(&ns_timer, jiffies + NS_POLL_PERIOD);
2728         PRINTK("nicstar: Leaving ns_poll().\n");
2729 }
2730
2731 static void ns_phy_put(struct atm_dev *dev, unsigned char value,
2732                        unsigned long addr)
2733 {
2734         ns_dev *card;
2735         unsigned long flags;
2736
2737         card = dev->dev_data;
2738         spin_lock_irqsave(&card->res_lock, flags);
2739         while (CMD_BUSY(card)) ;
2740         writel((u32) value, card->membase + DR0);
2741         writel(NS_CMD_WRITE_UTILITY | 0x00000200 | (addr & 0x000000FF),
2742                card->membase + CMD);
2743         spin_unlock_irqrestore(&card->res_lock, flags);
2744 }
2745
2746 static unsigned char ns_phy_get(struct atm_dev *dev, unsigned long addr)
2747 {
2748         ns_dev *card;
2749         unsigned long flags;
2750         u32 data;
2751
2752         card = dev->dev_data;
2753         spin_lock_irqsave(&card->res_lock, flags);
2754         while (CMD_BUSY(card)) ;
2755         writel(NS_CMD_READ_UTILITY | 0x00000200 | (addr & 0x000000FF),
2756                card->membase + CMD);
2757         while (CMD_BUSY(card)) ;
2758         data = readl(card->membase + DR0) & 0x000000FF;
2759         spin_unlock_irqrestore(&card->res_lock, flags);
2760         return (unsigned char)data;
2761 }
2762
2763 module_init(nicstar_init);
2764 module_exit(nicstar_cleanup);