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_DESCRIPTION("ATM NIC driver for IDT 77201/77211 \"NICStAR\" and Fore ForeRunnerLE.");
 175 MODULE_LICENSE("GPL");
 176
 177 /* Functions */
 178
 179 static int nicstar_init_one(struct pci_dev *pcidev,
 180                             const struct pci_device_id *ent)
 181 {
 182         static int index = -1;
 183         unsigned int error;
 184
 185         index++;
 186         cards[index] = NULL;
 187
 188         error = ns_init_card(index, pcidev);
 189         if (error) {
 190                 cards[index--] = NULL;  /* don't increment index */
 191                 goto err_out;
 192         }
 193
 194         return 0;
 195 err_out:
 196         return -ENODEV;
 197 }
 198
 199 static void nicstar_remove_one(struct pci_dev *pcidev)
 200 {
 201         int i, j;
 202         ns_dev *card = pci_get_drvdata(pcidev);
 203         struct sk_buff *hb;
 204         struct sk_buff *iovb;
 205         struct sk_buff *lb;
 206         struct sk_buff *sb;
 207
 208         i = card->index;
 209
 210         if (cards[i] == NULL)
 211                 return;
 212
 213         if (card->atmdev->phy && card->atmdev->phy->stop)
 214                 card->atmdev->phy->stop(card->atmdev);
 215
 216         /* Stop everything */
 217         writel(0x00000000, card->membase + CFG);
 218
 219         /* De-register device */
 220         atm_dev_deregister(card->atmdev);
 221
 222         /* Disable PCI device */
 223         pci_disable_device(pcidev);
 224
 225         /* Free up resources */
 226         j = 0;
 227         PRINTK("nicstar%d: freeing %d huge buffers.\n", i, card->hbpool.count);
 228         while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL) {
 229                 dev_kfree_skb_any(hb);
 230                 j++;
 231         }
 232         PRINTK("nicstar%d: %d huge buffers freed.\n", i, j);
 233         j = 0;
 234         PRINTK("nicstar%d: freeing %d iovec buffers.\n", i,
 235                card->iovpool.count);
 236         while ((iovb = skb_dequeue(&card->iovpool.queue)) != NULL) {
 237                 dev_kfree_skb_any(iovb);
 238                 j++;
 239         }
 240         PRINTK("nicstar%d: %d iovec buffers freed.\n", i, j);
 241         while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
 242                 dev_kfree_skb_any(lb);
 243         while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
 244                 dev_kfree_skb_any(sb);
 245         free_scq(card, card->scq0, NULL);
 246         for (j = 0; j < NS_FRSCD_NUM; j++) {
 247                 if (card->scd2vc[j] != NULL)
 248                         free_scq(card, card->scd2vc[j]->scq, card->scd2vc[j]->tx_vcc);
 249         }
 250         idr_destroy(&card->idr);
 251         dma_free_coherent(&card->pcidev->dev, NS_RSQSIZE + NS_RSQ_ALIGNMENT,
 252                           card->rsq.org, card->rsq.dma);
 253         dma_free_coherent(&card->pcidev->dev, NS_TSQSIZE + NS_TSQ_ALIGNMENT,
 254                           card->tsq.org, card->tsq.dma);
 255         free_irq(card->pcidev->irq, card);
 256         iounmap(card->membase);
 257         kfree(card);
 258 }
 259
 260 static const struct pci_device_id nicstar_pci_tbl[] = {
 261         { PCI_VDEVICE(IDT, PCI_DEVICE_ID_IDT_IDT77201), 0 },
 262         {0,}                    /* terminate list */
 263 };
 264
 265 MODULE_DEVICE_TABLE(pci, nicstar_pci_tbl);
 266
 267 static struct pci_driver nicstar_driver = {
 268         .name = "nicstar",
 269         .id_table = nicstar_pci_tbl,
 270         .probe = nicstar_init_one,
 271         .remove = nicstar_remove_one,
 272 };
 273
 274 static int __init nicstar_init(void)
 275 {
 276         unsigned error = 0;     /* Initialized to remove compile warning */
 277
 278         XPRINTK("nicstar: nicstar_init() called.\n");
 279
 280         error = pci_register_driver(&nicstar_driver);
 281
 282         TXPRINTK("nicstar: TX debug enabled.\n");
 283         RXPRINTK("nicstar: RX debug enabled.\n");
 284         PRINTK("nicstar: General debug enabled.\n");
 285 #ifdef PHY_LOOPBACK
 286         printk("nicstar: using PHY loopback.\n");
 287 #endif /* PHY_LOOPBACK */
 288         XPRINTK("nicstar: nicstar_init() returned.\n");
 289
 290         if (!error) {
 291                 timer_setup(&ns_timer, ns_poll, 0);
 292                 ns_timer.expires = jiffies + NS_POLL_PERIOD;
 293                 add_timer(&ns_timer);
 294         }
 295
 296         return error;
 297 }
 298
 299 static void __exit nicstar_cleanup(void)
 300 {
 301         XPRINTK("nicstar: nicstar_cleanup() called.\n");
 302
 303         del_timer_sync(&ns_timer);
 304
 305         pci_unregister_driver(&nicstar_driver);
 306
 307         XPRINTK("nicstar: nicstar_cleanup() returned.\n");
 308 }
 309
 310 static u32 ns_read_sram(ns_dev * card, u32 sram_address)
 311 {
 312         unsigned long flags;
 313         u32 data;
 314         sram_address <<= 2;
 315         sram_address &= 0x0007FFFC;     /* address must be dword aligned */
 316         sram_address |= 0x50000000;     /* SRAM read command */
 317         spin_lock_irqsave(&card->res_lock, flags);
 318         while (CMD_BUSY(card)) ;
 319         writel(sram_address, card->membase + CMD);
 320         while (CMD_BUSY(card)) ;
 321         data = readl(card->membase + DR0);
 322         spin_unlock_irqrestore(&card->res_lock, flags);
 323         return data;
 324 }
 325
 326 static void ns_write_sram(ns_dev * card, u32 sram_address, u32 * value,
 327                           int count)
 328 {
 329         unsigned long flags;
 330         int i, c;
 331         count--;                /* count range now is 0..3 instead of 1..4 */
 332         c = count;
 333         c <<= 2;                /* to use increments of 4 */
 334         spin_lock_irqsave(&card->res_lock, flags);
 335         while (CMD_BUSY(card)) ;
 336         for (i = 0; i <= c; i += 4)
 337                 writel(*(value++), card->membase + i);
 338         /* Note: DR# registers are the first 4 dwords in nicstar's memspace,
 339            so card->membase + DR0 == card->membase */
 340         sram_address <<= 2;
 341         sram_address &= 0x0007FFFC;
 342         sram_address |= (0x40000000 | count);
 343         writel(sram_address, card->membase + CMD);
 344         spin_unlock_irqrestore(&card->res_lock, flags);
 345 }
 346
 347 static int ns_init_card(int i, struct pci_dev *pcidev)
 348 {
 349         int j;
 350         struct ns_dev *card = NULL;
 351         unsigned char pci_latency;
 352         unsigned error;
 353         u32 data;
 354         u32 u32d[4];
 355         u32 ns_cfg_rctsize;
 356         int bcount;
 357         unsigned long membase;
 358
 359         error = 0;
 360
 361         if (pci_enable_device(pcidev)) {
 362                 printk("nicstar%d: can't enable PCI device\n", i);
 363                 error = 2;
 364                 ns_init_card_error(card, error);
 365                 return error;
 366         }
 367         if (dma_set_mask_and_coherent(&pcidev->dev, DMA_BIT_MASK(32)) != 0) {
 368                 printk(KERN_WARNING
 369                        "nicstar%d: No suitable DMA available.\n", i);
 370                 error = 2;
 371                 ns_init_card_error(card, error);
 372                 return error;
 373         }
 374
 375         card = kmalloc(sizeof(*card), GFP_KERNEL);
 376         if (!card) {
 377                 printk
 378                     ("nicstar%d: can't allocate memory for device structure.\n",
 379                      i);
 380                 error = 2;
 381                 ns_init_card_error(card, error);
 382                 return error;
 383         }
 384         cards[i] = card;
 385         spin_lock_init(&card->int_lock);
 386         spin_lock_init(&card->res_lock);
 387
 388         pci_set_drvdata(pcidev, card);
 389
 390         card->index = i;
 391         card->atmdev = NULL;
 392         card->pcidev = pcidev;
 393         membase = pci_resource_start(pcidev, 1);
 394         card->membase = ioremap(membase, NS_IOREMAP_SIZE);
 395         if (!card->membase) {
 396                 printk("nicstar%d: can't ioremap() membase.\n", i);
 397                 error = 3;
 398                 ns_init_card_error(card, error);
 399                 return error;
 400         }
 401         PRINTK("nicstar%d: membase at 0x%p.\n", i, card->membase);
 402
 403         pci_set_master(pcidev);
 404
 405         if (pci_read_config_byte(pcidev, PCI_LATENCY_TIMER, &pci_latency) != 0) {
 406                 printk("nicstar%d: can't read PCI latency timer.\n", i);
 407                 error = 6;
 408                 ns_init_card_error(card, error);
 409                 return error;
 410         }
 411 #ifdef NS_PCI_LATENCY
 412         if (pci_latency < NS_PCI_LATENCY) {
 413                 PRINTK("nicstar%d: setting PCI latency timer to %d.\n", i,
 414                        NS_PCI_LATENCY);
 415                 for (j = 1; j < 4; j++) {
 416                         if (pci_write_config_byte
 417                             (pcidev, PCI_LATENCY_TIMER, NS_PCI_LATENCY) != 0)
 418                                 break;
 419                 }
 420                 if (j == 4) {
 421                         printk
 422                             ("nicstar%d: can't set PCI latency timer to %d.\n",
 423                              i, NS_PCI_LATENCY);
 424                         error = 7;
 425                         ns_init_card_error(card, error);
 426                         return error;
 427                 }
 428         }
 429 #endif /* NS_PCI_LATENCY */
 430
 431         /* Clear timer overflow */
 432         data = readl(card->membase + STAT);
 433         if (data & NS_STAT_TMROF)
 434                 writel(NS_STAT_TMROF, card->membase + STAT);
 435
 436         /* Software reset */
 437         writel(NS_CFG_SWRST, card->membase + CFG);
 438         NS_DELAY;
 439         writel(0x00000000, card->membase + CFG);
 440
 441         /* PHY reset */
 442         writel(0x00000008, card->membase + GP);
 443         NS_DELAY;
 444         writel(0x00000001, card->membase + GP);
 445         NS_DELAY;
 446         while (CMD_BUSY(card)) ;
 447         writel(NS_CMD_WRITE_UTILITY | 0x00000100, card->membase + CMD); /* Sync UTOPIA with SAR clock */
 448         NS_DELAY;
 449
 450         /* Detect PHY type */
 451         while (CMD_BUSY(card)) ;
 452         writel(NS_CMD_READ_UTILITY | 0x00000200, card->membase + CMD);
 453         while (CMD_BUSY(card)) ;
 454         data = readl(card->membase + DR0);
 455         switch (data) {
 456         case 0x00000009:
 457                 printk("nicstar%d: PHY seems to be 25 Mbps.\n", i);
 458                 card->max_pcr = ATM_25_PCR;
 459                 while (CMD_BUSY(card)) ;
 460                 writel(0x00000008, card->membase + DR0);
 461                 writel(NS_CMD_WRITE_UTILITY | 0x00000200, card->membase + CMD);
 462                 /* Clear an eventual pending interrupt */
 463                 writel(NS_STAT_SFBQF, card->membase + STAT);
 464 #ifdef PHY_LOOPBACK
 465                 while (CMD_BUSY(card)) ;
 466                 writel(0x00000022, card->membase + DR0);
 467                 writel(NS_CMD_WRITE_UTILITY | 0x00000202, card->membase + CMD);
 468 #endif /* PHY_LOOPBACK */
 469                 break;
 470         case 0x00000030:
 471         case 0x00000031:
 472                 printk("nicstar%d: PHY seems to be 155 Mbps.\n", i);
 473                 card->max_pcr = ATM_OC3_PCR;
 474 #ifdef PHY_LOOPBACK
 475                 while (CMD_BUSY(card)) ;
 476                 writel(0x00000002, card->membase + DR0);
 477                 writel(NS_CMD_WRITE_UTILITY | 0x00000205, card->membase + CMD);
 478 #endif /* PHY_LOOPBACK */
 479                 break;
 480         default:
 481                 printk("nicstar%d: unknown PHY type (0x%08X).\n", i, data);
 482                 error = 8;
 483                 ns_init_card_error(card, error);
 484                 return error;
 485         }
 486         writel(0x00000000, card->membase + GP);
 487
 488         /* Determine SRAM size */
 489         data = 0x76543210;
 490         ns_write_sram(card, 0x1C003, &data, 1);
 491         data = 0x89ABCDEF;
 492         ns_write_sram(card, 0x14003, &data, 1);
 493         if (ns_read_sram(card, 0x14003) == 0x89ABCDEF &&
 494             ns_read_sram(card, 0x1C003) == 0x76543210)
 495                 card->sram_size = 128;
 496         else
 497                 card->sram_size = 32;
 498         PRINTK("nicstar%d: %dK x 32bit SRAM size.\n", i, card->sram_size);
 499
 500         card->rct_size = NS_MAX_RCTSIZE;
 501
 502 #if (NS_MAX_RCTSIZE == 4096)
 503         if (card->sram_size == 128)
 504                 printk
 505                     ("nicstar%d: limiting maximum VCI. See NS_MAX_RCTSIZE in nicstar.h\n",
 506                      i);
 507 #elif (NS_MAX_RCTSIZE == 16384)
 508         if (card->sram_size == 32) {
 509                 printk
 510                     ("nicstar%d: wasting memory. See NS_MAX_RCTSIZE in nicstar.h\n",
 511                      i);
 512                 card->rct_size = 4096;
 513         }
 514 #else
 515 #error NS_MAX_RCTSIZE must be either 4096 or 16384 in nicstar.c
 516 #endif
 517
 518         card->vpibits = NS_VPIBITS;
 519         if (card->rct_size == 4096)
 520                 card->vcibits = 12 - NS_VPIBITS;
 521         else                    /* card->rct_size == 16384 */
 522                 card->vcibits = 14 - NS_VPIBITS;
 523
 524         /* Initialize the nicstar eeprom/eprom stuff, for the MAC addr */
 525         if (mac[i] == NULL)
 526                 nicstar_init_eprom(card->membase);
 527
 528         /* Set the VPI/VCI MSb mask to zero so we can receive OAM cells */
 529         writel(0x00000000, card->membase + VPM);
 530
 531         card->intcnt = 0;
 532         if (request_irq
 533             (pcidev->irq, &ns_irq_handler, IRQF_SHARED, "nicstar", card) != 0) {
 534                 pr_err("nicstar%d: can't allocate IRQ %d.\n", i, pcidev->irq);
 535                 error = 9;
 536                 ns_init_card_error(card, error);
 537                 return error;
 538         }
 539
 540         /* Initialize TSQ */
 541         card->tsq.org = dma_alloc_coherent(&card->pcidev->dev,
 542                                            NS_TSQSIZE + NS_TSQ_ALIGNMENT,
 543                                            &card->tsq.dma, GFP_KERNEL);
 544         if (card->tsq.org == NULL) {
 545                 printk("nicstar%d: can't allocate TSQ.\n", i);
 546                 error = 10;
 547                 ns_init_card_error(card, error);
 548                 return error;
 549         }
 550         card->tsq.base = PTR_ALIGN(card->tsq.org, NS_TSQ_ALIGNMENT);
 551         card->tsq.next = card->tsq.base;
 552         card->tsq.last = card->tsq.base + (NS_TSQ_NUM_ENTRIES - 1);
 553         for (j = 0; j < NS_TSQ_NUM_ENTRIES; j++)
 554                 ns_tsi_init(card->tsq.base + j);
 555         writel(0x00000000, card->membase + TSQH);
 556         writel(ALIGN(card->tsq.dma, NS_TSQ_ALIGNMENT), card->membase + TSQB);
 557         PRINTK("nicstar%d: TSQ base at 0x%p.\n", i, card->tsq.base);
 558
 559         /* Initialize RSQ */
 560         card->rsq.org = dma_alloc_coherent(&card->pcidev->dev,
 561                                            NS_RSQSIZE + NS_RSQ_ALIGNMENT,
 562                                            &card->rsq.dma, GFP_KERNEL);
 563         if (card->rsq.org == NULL) {
 564                 printk("nicstar%d: can't allocate RSQ.\n", i);
 565                 error = 11;
 566                 ns_init_card_error(card, error);
 567                 return error;
 568         }
 569         card->rsq.base = PTR_ALIGN(card->rsq.org, NS_RSQ_ALIGNMENT);
 570         card->rsq.next = card->rsq.base;
 571         card->rsq.last = card->rsq.base + (NS_RSQ_NUM_ENTRIES - 1);
 572         for (j = 0; j < NS_RSQ_NUM_ENTRIES; j++)
 573                 ns_rsqe_init(card->rsq.base + j);
 574         writel(0x00000000, card->membase + RSQH);
 575         writel(ALIGN(card->rsq.dma, NS_RSQ_ALIGNMENT), card->membase + RSQB);
 576         PRINTK("nicstar%d: RSQ base at 0x%p.\n", i, card->rsq.base);
 577
 578         /* Initialize SCQ0, the only VBR SCQ used */
 579         card->scq1 = NULL;
 580         card->scq2 = NULL;
 581         card->scq0 = get_scq(card, VBR_SCQSIZE, NS_VRSCD0);
 582         if (card->scq0 == NULL) {
 583                 printk("nicstar%d: can't get SCQ0.\n", i);
 584                 error = 12;
 585                 ns_init_card_error(card, error);
 586                 return error;
 587         }
 588         u32d[0] = scq_virt_to_bus(card->scq0, card->scq0->base);
 589         u32d[1] = (u32) 0x00000000;
 590         u32d[2] = (u32) 0xffffffff;
 591         u32d[3] = (u32) 0x00000000;
 592         ns_write_sram(card, NS_VRSCD0, u32d, 4);
 593         ns_write_sram(card, NS_VRSCD1, u32d, 4);        /* These last two won't be used */
 594         ns_write_sram(card, NS_VRSCD2, u32d, 4);        /* but are initialized, just in case... */
 595         card->scq0->scd = NS_VRSCD0;
 596         PRINTK("nicstar%d: VBR-SCQ0 base at 0x%p.\n", i, card->scq0->base);
 597
 598         /* Initialize TSTs */
 599         card->tst_addr = NS_TST0;
 600         card->tst_free_entries = NS_TST_NUM_ENTRIES;
 601         data = NS_TST_OPCODE_VARIABLE;
 602         for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
 603                 ns_write_sram(card, NS_TST0 + j, &data, 1);
 604         data = ns_tste_make(NS_TST_OPCODE_END, NS_TST0);
 605         ns_write_sram(card, NS_TST0 + NS_TST_NUM_ENTRIES, &data, 1);
 606         for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
 607                 ns_write_sram(card, NS_TST1 + j, &data, 1);
 608         data = ns_tste_make(NS_TST_OPCODE_END, NS_TST1);
 609         ns_write_sram(card, NS_TST1 + NS_TST_NUM_ENTRIES, &data, 1);
 610         for (j = 0; j < NS_TST_NUM_ENTRIES; j++)
 611                 card->tste2vc[j] = NULL;
 612         writel(NS_TST0 << 2, card->membase + TSTB);
 613
 614         /* Initialize RCT. AAL type is set on opening the VC. */
 615 #ifdef RCQ_SUPPORT
 616         u32d[0] = NS_RCTE_RAWCELLINTEN;
 617 #else
 618         u32d[0] = 0x00000000;
 619 #endif /* RCQ_SUPPORT */
 620         u32d[1] = 0x00000000;
 621         u32d[2] = 0x00000000;
 622         u32d[3] = 0xFFFFFFFF;
 623         for (j = 0; j < card->rct_size; j++)
 624                 ns_write_sram(card, j * 4, u32d, 4);
 625
 626         memset(card->vcmap, 0, sizeof(card->vcmap));
 627
 628         for (j = 0; j < NS_FRSCD_NUM; j++)
 629                 card->scd2vc[j] = NULL;
 630
 631         /* Initialize buffer levels */
 632         card->sbnr.min = MIN_SB;
 633         card->sbnr.init = NUM_SB;
 634         card->sbnr.max = MAX_SB;
 635         card->lbnr.min = MIN_LB;
 636         card->lbnr.init = NUM_LB;
 637         card->lbnr.max = MAX_LB;
 638         card->iovnr.min = MIN_IOVB;
 639         card->iovnr.init = NUM_IOVB;
 640         card->iovnr.max = MAX_IOVB;
 641         card->hbnr.min = MIN_HB;
 642         card->hbnr.init = NUM_HB;
 643         card->hbnr.max = MAX_HB;
 644
 645         card->sm_handle = NULL;
 646         card->sm_addr = 0x00000000;
 647         card->lg_handle = NULL;
 648         card->lg_addr = 0x00000000;
 649
 650         card->efbie = 1;        /* To prevent push_rxbufs from enabling the interrupt */
 651
 652         idr_init(&card->idr);
 653
 654         /* Pre-allocate some huge buffers */
 655         skb_queue_head_init(&card->hbpool.queue);
 656         card->hbpool.count = 0;
 657         for (j = 0; j < NUM_HB; j++) {
 658                 struct sk_buff *hb;
 659                 hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
 660                 if (hb == NULL) {
 661                         printk
 662                             ("nicstar%d: can't allocate %dth of %d huge buffers.\n",
 663                              i, j, NUM_HB);
 664                         error = 13;
 665                         ns_init_card_error(card, error);
 666                         return error;
 667                 }
 668                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
 669                 skb_queue_tail(&card->hbpool.queue, hb);
 670                 card->hbpool.count++;
 671         }
 672
 673         /* Allocate large buffers */
 674         skb_queue_head_init(&card->lbpool.queue);
 675         card->lbpool.count = 0; /* Not used */
 676         for (j = 0; j < NUM_LB; j++) {
 677                 struct sk_buff *lb;
 678                 lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
 679                 if (lb == NULL) {
 680                         printk
 681                             ("nicstar%d: can't allocate %dth of %d large buffers.\n",
 682                              i, j, NUM_LB);
 683                         error = 14;
 684                         ns_init_card_error(card, error);
 685                         return error;
 686                 }
 687                 NS_PRV_BUFTYPE(lb) = BUF_LG;
 688                 skb_queue_tail(&card->lbpool.queue, lb);
 689                 skb_reserve(lb, NS_SMBUFSIZE);
 690                 push_rxbufs(card, lb);
 691                 /* Due to the implementation of push_rxbufs() this is 1, not 0 */
 692                 if (j == 1) {
 693                         card->rcbuf = lb;
 694                         card->rawcell = (struct ns_rcqe *) lb->data;
 695                         card->rawch = NS_PRV_DMA(lb);
 696                 }
 697         }
 698         /* Test for strange behaviour which leads to crashes */
 699         if ((bcount =
 700              ns_stat_lfbqc_get(readl(card->membase + STAT))) < card->lbnr.min) {
 701                 printk
 702                     ("nicstar%d: Strange... Just allocated %d large buffers and lfbqc = %d.\n",
 703                      i, j, bcount);
 704                 error = 14;
 705                 ns_init_card_error(card, error);
 706                 return error;
 707         }
 708
 709         /* Allocate small buffers */
 710         skb_queue_head_init(&card->sbpool.queue);
 711         card->sbpool.count = 0; /* Not used */
 712         for (j = 0; j < NUM_SB; j++) {
 713                 struct sk_buff *sb;
 714                 sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
 715                 if (sb == NULL) {
 716                         printk
 717                             ("nicstar%d: can't allocate %dth of %d small buffers.\n",
 718                              i, j, NUM_SB);
 719                         error = 15;
 720                         ns_init_card_error(card, error);
 721                         return error;
 722                 }
 723                 NS_PRV_BUFTYPE(sb) = BUF_SM;
 724                 skb_queue_tail(&card->sbpool.queue, sb);
 725                 skb_reserve(sb, NS_AAL0_HEADER);
 726                 push_rxbufs(card, sb);
 727         }
 728         /* Test for strange behaviour which leads to crashes */
 729         if ((bcount =
 730              ns_stat_sfbqc_get(readl(card->membase + STAT))) < card->sbnr.min) {
 731                 printk
 732                     ("nicstar%d: Strange... Just allocated %d small buffers and sfbqc = %d.\n",
 733                      i, j, bcount);
 734                 error = 15;
 735                 ns_init_card_error(card, error);
 736                 return error;
 737         }
 738
 739         /* Allocate iovec buffers */
 740         skb_queue_head_init(&card->iovpool.queue);
 741         card->iovpool.count = 0;
 742         for (j = 0; j < NUM_IOVB; j++) {
 743                 struct sk_buff *iovb;
 744                 iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
 745                 if (iovb == NULL) {
 746                         printk
 747                             ("nicstar%d: can't allocate %dth of %d iovec buffers.\n",
 748                              i, j, NUM_IOVB);
 749                         error = 16;
 750                         ns_init_card_error(card, error);
 751                         return error;
 752                 }
 753                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
 754                 skb_queue_tail(&card->iovpool.queue, iovb);
 755                 card->iovpool.count++;
 756         }
 757
 758         /* Configure NICStAR */
 759         if (card->rct_size == 4096)
 760                 ns_cfg_rctsize = NS_CFG_RCTSIZE_4096_ENTRIES;
 761         else                    /* (card->rct_size == 16384) */
 762                 ns_cfg_rctsize = NS_CFG_RCTSIZE_16384_ENTRIES;
 763
 764         card->efbie = 1;
 765
 766         /* Register device */
 767         card->atmdev = atm_dev_register("nicstar", &card->pcidev->dev, &atm_ops,
 768                                         -1, NULL);
 769         if (card->atmdev == NULL) {
 770                 printk("nicstar%d: can't register device.\n", i);
 771                 error = 17;
 772                 ns_init_card_error(card, error);
 773                 return error;
 774         }
 775
 776         if (mac[i] == NULL || !mac_pton(mac[i], card->atmdev->esi)) {
 777                 nicstar_read_eprom(card->membase, NICSTAR_EPROM_MAC_ADDR_OFFSET,
 778                                    card->atmdev->esi, 6);
 779                 if (ether_addr_equal(card->atmdev->esi, "\x00\x00\x00\x00\x00\x00")) {
 780                         nicstar_read_eprom(card->membase,
 781                                            NICSTAR_EPROM_MAC_ADDR_OFFSET_ALT,
 782                                            card->atmdev->esi, 6);
 783                 }
 784         }
 785
 786         printk("nicstar%d: MAC address %pM\n", i, card->atmdev->esi);
 787
 788         card->atmdev->dev_data = card;
 789         card->atmdev->ci_range.vpi_bits = card->vpibits;
 790         card->atmdev->ci_range.vci_bits = card->vcibits;
 791         card->atmdev->link_rate = card->max_pcr;
 792         card->atmdev->phy = NULL;
 793
 794 #ifdef CONFIG_ATM_NICSTAR_USE_SUNI
 795         if (card->max_pcr == ATM_OC3_PCR)
 796                 suni_init(card->atmdev);
 797 #endif /* CONFIG_ATM_NICSTAR_USE_SUNI */
 798
 799 #ifdef CONFIG_ATM_NICSTAR_USE_IDT77105
 800         if (card->max_pcr == ATM_25_PCR)
 801                 idt77105_init(card->atmdev);
 802 #endif /* CONFIG_ATM_NICSTAR_USE_IDT77105 */
 803
 804         if (card->atmdev->phy && card->atmdev->phy->start)
 805                 card->atmdev->phy->start(card->atmdev);
 806
 807         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 */
 808                NS_CFG_RSQAFIE | NS_CFG_TXEN | NS_CFG_TXIE | NS_CFG_TSQFIE_OPT | /* Only enabled if ENABLE_TSQFIE */
 809                NS_CFG_PHYIE, card->membase + CFG);
 810
 811         num_cards++;
 812
 813         return error;
 814 }
 815
 816 static void ns_init_card_error(ns_dev *card, int error)
 817 {
 818         if (error >= 17) {
 819                 writel(0x00000000, card->membase + CFG);
 820         }
 821         if (error >= 16) {
 822                 struct sk_buff *iovb;
 823                 while ((iovb = skb_dequeue(&card->iovpool.queue)) != NULL)
 824                         dev_kfree_skb_any(iovb);
 825         }
 826         if (error >= 15) {
 827                 struct sk_buff *sb;
 828                 while ((sb = skb_dequeue(&card->sbpool.queue)) != NULL)
 829                         dev_kfree_skb_any(sb);
 830                 free_scq(card, card->scq0, NULL);
 831         }
 832         if (error >= 14) {
 833                 struct sk_buff *lb;
 834                 while ((lb = skb_dequeue(&card->lbpool.queue)) != NULL)
 835                         dev_kfree_skb_any(lb);
 836         }
 837         if (error >= 13) {
 838                 struct sk_buff *hb;
 839                 while ((hb = skb_dequeue(&card->hbpool.queue)) != NULL)
 840                         dev_kfree_skb_any(hb);
 841         }
 842         if (error >= 12) {
 843                 dma_free_coherent(&card->pcidev->dev, NS_RSQSIZE + NS_RSQ_ALIGNMENT,
 844                                 card->rsq.org, card->rsq.dma);
 845         }
 846         if (error >= 11) {
 847                 dma_free_coherent(&card->pcidev->dev, NS_TSQSIZE + NS_TSQ_ALIGNMENT,
 848                                 card->tsq.org, card->tsq.dma);
 849         }
 850         if (error >= 10) {
 851                 free_irq(card->pcidev->irq, card);
 852         }
 853         if (error >= 4) {
 854                 iounmap(card->membase);
 855         }
 856         if (error >= 3) {
 857                 pci_disable_device(card->pcidev);
 858                 kfree(card);
 859         }
 860 }
 861
 862 static scq_info *get_scq(ns_dev *card, int size, u32 scd)
 863 {
 864         scq_info *scq;
 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 = kcalloc(size / NS_SCQE_SIZE, sizeof(*scq->skb),
 879                            GFP_KERNEL);
 880         if (!scq->skb) {
 881                 dma_free_coherent(&card->pcidev->dev,
 882                                   2 * size, scq->org, scq->dma);
 883                 kfree(scq);
 884                 return NULL;
 885         }
 886         scq->num_entries = size / NS_SCQE_SIZE;
 887         scq->base = PTR_ALIGN(scq->org, size);
 888         scq->next = scq->base;
 889         scq->last = scq->base + (scq->num_entries - 1);
 890         scq->tail = scq->last;
 891         scq->scd = scd;
 892         scq->tbd_count = 0;
 893         init_waitqueue_head(&scq->scqfull_waitq);
 894         scq->full = 0;
 895         spin_lock_init(&scq->lock);
 896
 897         return scq;
 898 }
 899
 900 /* For variable rate SCQ vcc must be NULL */
 901 static void free_scq(ns_dev *card, scq_info *scq, struct atm_vcc *vcc)
 902 {
 903         int i;
 904
 905         if (scq->num_entries == VBR_SCQ_NUM_ENTRIES)
 906                 for (i = 0; i < scq->num_entries; i++) {
 907                         if (scq->skb[i] != NULL) {
 908                                 vcc = ATM_SKB(scq->skb[i])->vcc;
 909                                 if (vcc->pop != NULL)
 910                                         vcc->pop(vcc, scq->skb[i]);
 911                                 else
 912                                         dev_kfree_skb_any(scq->skb[i]);
 913                         }
 914         } else {                /* vcc must be != NULL */
 915
 916                 if (vcc == NULL) {
 917                         printk
 918                             ("nicstar: free_scq() called with vcc == NULL for fixed rate scq.");
 919                         for (i = 0; i < scq->num_entries; i++)
 920                                 dev_kfree_skb_any(scq->skb[i]);
 921                 } else
 922                         for (i = 0; i < scq->num_entries; i++) {
 923                                 if (scq->skb[i] != NULL) {
 924                                         if (vcc->pop != NULL)
 925                                                 vcc->pop(vcc, scq->skb[i]);
 926                                         else
 927                                                 dev_kfree_skb_any(scq->skb[i]);
 928                                 }
 929                         }
 930         }
 931         kfree(scq->skb);
 932         dma_free_coherent(&card->pcidev->dev,
 933                           2 * (scq->num_entries == VBR_SCQ_NUM_ENTRIES ?
 934                                VBR_SCQSIZE : CBR_SCQSIZE),
 935                           scq->org, scq->dma);
 936         kfree(scq);
 937 }
 938
 939 /* The handles passed must be pointers to the sk_buff containing the small
 940    or large buffer(s) cast to u32. */
 941 static void push_rxbufs(ns_dev * card, struct sk_buff *skb)
 942 {
 943         struct sk_buff *handle1, *handle2;
 944         int id1, id2;
 945         u32 addr1, addr2;
 946         u32 stat;
 947         unsigned long flags;
 948
 949         /* *BARF* */
 950         handle2 = NULL;
 951         addr2 = 0;
 952         handle1 = skb;
 953         addr1 = dma_map_single(&card->pcidev->dev,
 954                                skb->data,
 955                                (NS_PRV_BUFTYPE(skb) == BUF_SM
 956                                 ? NS_SMSKBSIZE : NS_LGSKBSIZE),
 957                                DMA_TO_DEVICE);
 958         NS_PRV_DMA(skb) = addr1; /* save so we can unmap later */
 959
 960 #ifdef GENERAL_DEBUG
 961         if (!addr1)
 962                 printk("nicstar%d: push_rxbufs called with addr1 = 0.\n",
 963                        card->index);
 964 #endif /* GENERAL_DEBUG */
 965
 966         stat = readl(card->membase + STAT);
 967         card->sbfqc = ns_stat_sfbqc_get(stat);
 968         card->lbfqc = ns_stat_lfbqc_get(stat);
 969         if (NS_PRV_BUFTYPE(skb) == BUF_SM) {
 970                 if (!addr2) {
 971                         if (card->sm_addr) {
 972                                 addr2 = card->sm_addr;
 973                                 handle2 = card->sm_handle;
 974                                 card->sm_addr = 0x00000000;
 975                                 card->sm_handle = NULL;
 976                         } else {        /* (!sm_addr) */
 977
 978                                 card->sm_addr = addr1;
 979                                 card->sm_handle = handle1;
 980                         }
 981                 }
 982         } else {                /* buf_type == BUF_LG */
 983
 984                 if (!addr2) {
 985                         if (card->lg_addr) {
 986                                 addr2 = card->lg_addr;
 987                                 handle2 = card->lg_handle;
 988                                 card->lg_addr = 0x00000000;
 989                                 card->lg_handle = NULL;
 990                         } else {        /* (!lg_addr) */
 991
 992                                 card->lg_addr = addr1;
 993                                 card->lg_handle = handle1;
 994                         }
 995                 }
 996         }
 997
 998         if (addr2) {
 999                 if (NS_PRV_BUFTYPE(skb) == BUF_SM) {
1000                         if (card->sbfqc >= card->sbnr.max) {
1001                                 skb_unlink(handle1, &card->sbpool.queue);
1002                                 dev_kfree_skb_any(handle1);
1003                                 skb_unlink(handle2, &card->sbpool.queue);
1004                                 dev_kfree_skb_any(handle2);
1005                                 return;
1006                         } else
1007                                 card->sbfqc += 2;
1008                 } else {        /* (buf_type == BUF_LG) */
1009
1010                         if (card->lbfqc >= card->lbnr.max) {
1011                                 skb_unlink(handle1, &card->lbpool.queue);
1012                                 dev_kfree_skb_any(handle1);
1013                                 skb_unlink(handle2, &card->lbpool.queue);
1014                                 dev_kfree_skb_any(handle2);
1015                                 return;
1016                         } else
1017                                 card->lbfqc += 2;
1018                 }
1019
1020                 id1 = idr_alloc(&card->idr, handle1, 0, 0, GFP_ATOMIC);
1021                 if (id1 < 0)
1022                         goto out;
1023
1024                 id2 = idr_alloc(&card->idr, handle2, 0, 0, GFP_ATOMIC);
1025                 if (id2 < 0)
1026                         goto out;
1027
1028                 spin_lock_irqsave(&card->res_lock, flags);
1029                 while (CMD_BUSY(card)) ;
1030                 writel(addr2, card->membase + DR3);
1031                 writel(id2, card->membase + DR2);
1032                 writel(addr1, card->membase + DR1);
1033                 writel(id1, card->membase + DR0);
1034                 writel(NS_CMD_WRITE_FREEBUFQ | NS_PRV_BUFTYPE(skb),
1035                        card->membase + CMD);
1036                 spin_unlock_irqrestore(&card->res_lock, flags);
1037
1038                 XPRINTK("nicstar%d: Pushing %s buffers at 0x%x and 0x%x.\n",
1039                         card->index,
1040                         (NS_PRV_BUFTYPE(skb) == BUF_SM ? "small" : "large"),
1041                         addr1, addr2);
1042         }
1043
1044         if (!card->efbie && card->sbfqc >= card->sbnr.min &&
1045             card->lbfqc >= card->lbnr.min) {
1046                 card->efbie = 1;
1047                 writel((readl(card->membase + CFG) | NS_CFG_EFBIE),
1048                        card->membase + CFG);
1049         }
1050
1051 out:
1052         return;
1053 }
1054
1055 static irqreturn_t ns_irq_handler(int irq, void *dev_id)
1056 {
1057         u32 stat_r;
1058         ns_dev *card;
1059         struct atm_dev *dev;
1060         unsigned long flags;
1061
1062         card = (ns_dev *) dev_id;
1063         dev = card->atmdev;
1064         card->intcnt++;
1065
1066         PRINTK("nicstar%d: NICStAR generated an interrupt\n", card->index);
1067
1068         spin_lock_irqsave(&card->int_lock, flags);
1069
1070         stat_r = readl(card->membase + STAT);
1071
1072         /* Transmit Status Indicator has been written to T. S. Queue */
1073         if (stat_r & NS_STAT_TSIF) {
1074                 TXPRINTK("nicstar%d: TSI interrupt\n", card->index);
1075                 process_tsq(card);
1076                 writel(NS_STAT_TSIF, card->membase + STAT);
1077         }
1078
1079         /* Incomplete CS-PDU has been transmitted */
1080         if (stat_r & NS_STAT_TXICP) {
1081                 writel(NS_STAT_TXICP, card->membase + STAT);
1082                 TXPRINTK("nicstar%d: Incomplete CS-PDU transmitted.\n",
1083                          card->index);
1084         }
1085
1086         /* Transmit Status Queue 7/8 full */
1087         if (stat_r & NS_STAT_TSQF) {
1088                 writel(NS_STAT_TSQF, card->membase + STAT);
1089                 PRINTK("nicstar%d: TSQ full.\n", card->index);
1090                 process_tsq(card);
1091         }
1092
1093         /* Timer overflow */
1094         if (stat_r & NS_STAT_TMROF) {
1095                 writel(NS_STAT_TMROF, card->membase + STAT);
1096                 PRINTK("nicstar%d: Timer overflow.\n", card->index);
1097         }
1098
1099         /* PHY device interrupt signal active */
1100         if (stat_r & NS_STAT_PHYI) {
1101                 writel(NS_STAT_PHYI, card->membase + STAT);
1102                 PRINTK("nicstar%d: PHY interrupt.\n", card->index);
1103                 if (dev->phy && dev->phy->interrupt) {
1104                         dev->phy->interrupt(dev);
1105                 }
1106         }
1107
1108         /* Small Buffer Queue is full */
1109         if (stat_r & NS_STAT_SFBQF) {
1110                 writel(NS_STAT_SFBQF, card->membase + STAT);
1111                 printk("nicstar%d: Small free buffer queue is full.\n",
1112                        card->index);
1113         }
1114
1115         /* Large Buffer Queue is full */
1116         if (stat_r & NS_STAT_LFBQF) {
1117                 writel(NS_STAT_LFBQF, card->membase + STAT);
1118                 printk("nicstar%d: Large free buffer queue is full.\n",
1119                        card->index);
1120         }
1121
1122         /* Receive Status Queue is full */
1123         if (stat_r & NS_STAT_RSQF) {
1124                 writel(NS_STAT_RSQF, card->membase + STAT);
1125                 printk("nicstar%d: RSQ full.\n", card->index);
1126                 process_rsq(card);
1127         }
1128
1129         /* Complete CS-PDU received */
1130         if (stat_r & NS_STAT_EOPDU) {
1131                 RXPRINTK("nicstar%d: End of CS-PDU received.\n", card->index);
1132                 process_rsq(card);
1133                 writel(NS_STAT_EOPDU, card->membase + STAT);
1134         }
1135
1136         /* Raw cell received */
1137         if (stat_r & NS_STAT_RAWCF) {
1138                 writel(NS_STAT_RAWCF, card->membase + STAT);
1139 #ifndef RCQ_SUPPORT
1140                 printk("nicstar%d: Raw cell received and no support yet...\n",
1141                        card->index);
1142 #endif /* RCQ_SUPPORT */
1143                 /* NOTE: the following procedure may keep a raw cell pending until the
1144                    next interrupt. As this preliminary support is only meant to
1145                    avoid buffer leakage, this is not an issue. */
1146                 while (readl(card->membase + RAWCT) != card->rawch) {
1147
1148                         if (ns_rcqe_islast(card->rawcell)) {
1149                                 struct sk_buff *oldbuf;
1150
1151                                 oldbuf = card->rcbuf;
1152                                 card->rcbuf = idr_find(&card->idr,
1153                                                        ns_rcqe_nextbufhandle(card->rawcell));
1154                                 card->rawch = NS_PRV_DMA(card->rcbuf);
1155                                 card->rawcell = (struct ns_rcqe *)
1156                                                 card->rcbuf->data;
1157                                 recycle_rx_buf(card, oldbuf);
1158                         } else {
1159                                 card->rawch += NS_RCQE_SIZE;
1160                                 card->rawcell++;
1161                         }
1162                 }
1163         }
1164
1165         /* Small buffer queue is empty */
1166         if (stat_r & NS_STAT_SFBQE) {
1167                 int i;
1168                 struct sk_buff *sb;
1169
1170                 writel(NS_STAT_SFBQE, card->membase + STAT);
1171                 printk("nicstar%d: Small free buffer queue empty.\n",
1172                        card->index);
1173                 for (i = 0; i < card->sbnr.min; i++) {
1174                         sb = dev_alloc_skb(NS_SMSKBSIZE);
1175                         if (sb == NULL) {
1176                                 writel(readl(card->membase + CFG) &
1177                                        ~NS_CFG_EFBIE, card->membase + CFG);
1178                                 card->efbie = 0;
1179                                 break;
1180                         }
1181                         NS_PRV_BUFTYPE(sb) = BUF_SM;
1182                         skb_queue_tail(&card->sbpool.queue, sb);
1183                         skb_reserve(sb, NS_AAL0_HEADER);
1184                         push_rxbufs(card, sb);
1185                 }
1186                 card->sbfqc = i;
1187                 process_rsq(card);
1188         }
1189
1190         /* Large buffer queue empty */
1191         if (stat_r & NS_STAT_LFBQE) {
1192                 int i;
1193                 struct sk_buff *lb;
1194
1195                 writel(NS_STAT_LFBQE, card->membase + STAT);
1196                 printk("nicstar%d: Large free buffer queue empty.\n",
1197                        card->index);
1198                 for (i = 0; i < card->lbnr.min; i++) {
1199                         lb = dev_alloc_skb(NS_LGSKBSIZE);
1200                         if (lb == NULL) {
1201                                 writel(readl(card->membase + CFG) &
1202                                        ~NS_CFG_EFBIE, card->membase + CFG);
1203                                 card->efbie = 0;
1204                                 break;
1205                         }
1206                         NS_PRV_BUFTYPE(lb) = BUF_LG;
1207                         skb_queue_tail(&card->lbpool.queue, lb);
1208                         skb_reserve(lb, NS_SMBUFSIZE);
1209                         push_rxbufs(card, lb);
1210                 }
1211                 card->lbfqc = i;
1212                 process_rsq(card);
1213         }
1214
1215         /* Receive Status Queue is 7/8 full */
1216         if (stat_r & NS_STAT_RSQAF) {
1217                 writel(NS_STAT_RSQAF, card->membase + STAT);
1218                 RXPRINTK("nicstar%d: RSQ almost full.\n", card->index);
1219                 process_rsq(card);
1220         }
1221
1222         spin_unlock_irqrestore(&card->int_lock, flags);
1223         PRINTK("nicstar%d: end of interrupt service\n", card->index);
1224         return IRQ_HANDLED;
1225 }
1226
1227 static int ns_open(struct atm_vcc *vcc)
1228 {
1229         ns_dev *card;
1230         vc_map *vc;
1231         unsigned long tmpl, modl;
1232         int tcr, tcra;          /* target cell rate, and absolute value */
1233         int n = 0;              /* Number of entries in the TST. Initialized to remove
1234                                    the compiler warning. */
1235         u32 u32d[4];
1236         int frscdi = 0;         /* Index of the SCD. Initialized to remove the compiler
1237                                    warning. How I wish compilers were clever enough to
1238                                    tell which variables can truly be used
1239                                    uninitialized... */
1240         int inuse;              /* tx or rx vc already in use by another vcc */
1241         short vpi = vcc->vpi;
1242         int vci = vcc->vci;
1243
1244         card = (ns_dev *) vcc->dev->dev_data;
1245         PRINTK("nicstar%d: opening vpi.vci %d.%d \n", card->index, (int)vpi,
1246                vci);
1247         if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0) {
1248                 PRINTK("nicstar%d: unsupported AAL.\n", card->index);
1249                 return -EINVAL;
1250         }
1251
1252         vc = &(card->vcmap[vpi << card->vcibits | vci]);
1253         vcc->dev_data = vc;
1254
1255         inuse = 0;
1256         if (vcc->qos.txtp.traffic_class != ATM_NONE && vc->tx)
1257                 inuse = 1;
1258         if (vcc->qos.rxtp.traffic_class != ATM_NONE && vc->rx)
1259                 inuse += 2;
1260         if (inuse) {
1261                 printk("nicstar%d: %s vci already in use.\n", card->index,
1262                        inuse == 1 ? "tx" : inuse == 2 ? "rx" : "tx and rx");
1263                 return -EINVAL;
1264         }
1265
1266         set_bit(ATM_VF_ADDR, &vcc->flags);
1267
1268         /* NOTE: You are not allowed to modify an open connection's QOS. To change
1269            that, remove the ATM_VF_PARTIAL flag checking. There may be other changes
1270            needed to do that. */
1271         if (!test_bit(ATM_VF_PARTIAL, &vcc->flags)) {
1272                 scq_info *scq;
1273
1274                 set_bit(ATM_VF_PARTIAL, &vcc->flags);
1275                 if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1276                         /* Check requested cell rate and availability of SCD */
1277                         if (vcc->qos.txtp.max_pcr == 0 && vcc->qos.txtp.pcr == 0
1278                             && vcc->qos.txtp.min_pcr == 0) {
1279                                 PRINTK
1280                                     ("nicstar%d: trying to open a CBR vc with cell rate = 0 \n",
1281                                      card->index);
1282                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1283                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1284                                 return -EINVAL;
1285                         }
1286
1287                         tcr = atm_pcr_goal(&(vcc->qos.txtp));
1288                         tcra = tcr >= 0 ? tcr : -tcr;
1289
1290                         PRINTK("nicstar%d: target cell rate = %d.\n",
1291                                card->index, vcc->qos.txtp.max_pcr);
1292
1293                         tmpl =
1294                             (unsigned long)tcra *(unsigned long)
1295                             NS_TST_NUM_ENTRIES;
1296                         modl = tmpl % card->max_pcr;
1297
1298                         n = (int)(tmpl / card->max_pcr);
1299                         if (tcr > 0) {
1300                                 if (modl > 0)
1301                                         n++;
1302                         } else if (tcr == 0) {
1303                                 if ((n =
1304                                      (card->tst_free_entries -
1305                                       NS_TST_RESERVED)) <= 0) {
1306                                         PRINTK
1307                                             ("nicstar%d: no CBR bandwidth free.\n",
1308                                              card->index);
1309                                         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1310                                         clear_bit(ATM_VF_ADDR, &vcc->flags);
1311                                         return -EINVAL;
1312                                 }
1313                         }
1314
1315                         if (n == 0) {
1316                                 printk
1317                                     ("nicstar%d: selected bandwidth < granularity.\n",
1318                                      card->index);
1319                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1320                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1321                                 return -EINVAL;
1322                         }
1323
1324                         if (n > (card->tst_free_entries - NS_TST_RESERVED)) {
1325                                 PRINTK
1326                                     ("nicstar%d: not enough free CBR bandwidth.\n",
1327                                      card->index);
1328                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1329                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1330                                 return -EINVAL;
1331                         } else
1332                                 card->tst_free_entries -= n;
1333
1334                         XPRINTK("nicstar%d: writing %d tst entries.\n",
1335                                 card->index, n);
1336                         for (frscdi = 0; frscdi < NS_FRSCD_NUM; frscdi++) {
1337                                 if (card->scd2vc[frscdi] == NULL) {
1338                                         card->scd2vc[frscdi] = vc;
1339                                         break;
1340                                 }
1341                         }
1342                         if (frscdi == NS_FRSCD_NUM) {
1343                                 PRINTK
1344                                     ("nicstar%d: no SCD available for CBR channel.\n",
1345                                      card->index);
1346                                 card->tst_free_entries += n;
1347                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1348                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1349                                 return -EBUSY;
1350                         }
1351
1352                         vc->cbr_scd = NS_FRSCD + frscdi * NS_FRSCD_SIZE;
1353
1354                         scq = get_scq(card, CBR_SCQSIZE, vc->cbr_scd);
1355                         if (scq == NULL) {
1356                                 PRINTK("nicstar%d: can't get fixed rate SCQ.\n",
1357                                        card->index);
1358                                 card->scd2vc[frscdi] = NULL;
1359                                 card->tst_free_entries += n;
1360                                 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1361                                 clear_bit(ATM_VF_ADDR, &vcc->flags);
1362                                 return -ENOMEM;
1363                         }
1364                         vc->scq = scq;
1365                         u32d[0] = scq_virt_to_bus(scq, scq->base);
1366                         u32d[1] = (u32) 0x00000000;
1367                         u32d[2] = (u32) 0xffffffff;
1368                         u32d[3] = (u32) 0x00000000;
1369                         ns_write_sram(card, vc->cbr_scd, u32d, 4);
1370
1371                         fill_tst(card, n, vc);
1372                 } else if (vcc->qos.txtp.traffic_class == ATM_UBR) {
1373                         vc->cbr_scd = 0x00000000;
1374                         vc->scq = card->scq0;
1375                 }
1376
1377                 if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1378                         vc->tx = 1;
1379                         vc->tx_vcc = vcc;
1380                         vc->tbd_count = 0;
1381                 }
1382                 if (vcc->qos.rxtp.traffic_class != ATM_NONE) {
1383                         u32 status;
1384
1385                         vc->rx = 1;
1386                         vc->rx_vcc = vcc;
1387                         vc->rx_iov = NULL;
1388
1389                         /* Open the connection in hardware */
1390                         if (vcc->qos.aal == ATM_AAL5)
1391                                 status = NS_RCTE_AAL5 | NS_RCTE_CONNECTOPEN;
1392                         else    /* vcc->qos.aal == ATM_AAL0 */
1393                                 status = NS_RCTE_AAL0 | NS_RCTE_CONNECTOPEN;
1394 #ifdef RCQ_SUPPORT
1395                         status |= NS_RCTE_RAWCELLINTEN;
1396 #endif /* RCQ_SUPPORT */
1397                         ns_write_sram(card,
1398                                       NS_RCT +
1399                                       (vpi << card->vcibits | vci) *
1400                                       NS_RCT_ENTRY_SIZE, &status, 1);
1401                 }
1402
1403         }
1404
1405         set_bit(ATM_VF_READY, &vcc->flags);
1406         return 0;
1407 }
1408
1409 static void ns_close(struct atm_vcc *vcc)
1410 {
1411         vc_map *vc;
1412         ns_dev *card;
1413         u32 data;
1414         int i;
1415
1416         vc = vcc->dev_data;
1417         card = vcc->dev->dev_data;
1418         PRINTK("nicstar%d: closing vpi.vci %d.%d \n", card->index,
1419                (int)vcc->vpi, vcc->vci);
1420
1421         clear_bit(ATM_VF_READY, &vcc->flags);
1422
1423         if (vcc->qos.rxtp.traffic_class != ATM_NONE) {
1424                 u32 addr;
1425                 unsigned long flags;
1426
1427                 addr =
1428                     NS_RCT +
1429                     (vcc->vpi << card->vcibits | vcc->vci) * NS_RCT_ENTRY_SIZE;
1430                 spin_lock_irqsave(&card->res_lock, flags);
1431                 while (CMD_BUSY(card)) ;
1432                 writel(NS_CMD_CLOSE_CONNECTION | addr << 2,
1433                        card->membase + CMD);
1434                 spin_unlock_irqrestore(&card->res_lock, flags);
1435
1436                 vc->rx = 0;
1437                 if (vc->rx_iov != NULL) {
1438                         struct sk_buff *iovb;
1439                         u32 stat;
1440
1441                         stat = readl(card->membase + STAT);
1442                         card->sbfqc = ns_stat_sfbqc_get(stat);
1443                         card->lbfqc = ns_stat_lfbqc_get(stat);
1444
1445                         PRINTK
1446                             ("nicstar%d: closing a VC with pending rx buffers.\n",
1447                              card->index);
1448                         iovb = vc->rx_iov;
1449                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
1450                                               NS_PRV_IOVCNT(iovb));
1451                         NS_PRV_IOVCNT(iovb) = 0;
1452                         spin_lock_irqsave(&card->int_lock, flags);
1453                         recycle_iov_buf(card, iovb);
1454                         spin_unlock_irqrestore(&card->int_lock, flags);
1455                         vc->rx_iov = NULL;
1456                 }
1457         }
1458
1459         if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1460                 vc->tx = 0;
1461         }
1462
1463         if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1464                 unsigned long flags;
1465                 ns_scqe *scqep;
1466                 scq_info *scq;
1467
1468                 scq = vc->scq;
1469
1470                 for (;;) {
1471                         spin_lock_irqsave(&scq->lock, flags);
1472                         scqep = scq->next;
1473                         if (scqep == scq->base)
1474                                 scqep = scq->last;
1475                         else
1476                                 scqep--;
1477                         if (scqep == scq->tail) {
1478                                 spin_unlock_irqrestore(&scq->lock, flags);
1479                                 break;
1480                         }
1481                         /* If the last entry is not a TSR, place one in the SCQ in order to
1482                            be able to completely drain it and then close. */
1483                         if (!ns_scqe_is_tsr(scqep) && scq->tail != scq->next) {
1484                                 ns_scqe tsr;
1485                                 u32 scdi, scqi;
1486                                 u32 data;
1487                                 int index;
1488
1489                                 tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
1490                                 scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
1491                                 scqi = scq->next - scq->base;
1492                                 tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
1493                                 tsr.word_3 = 0x00000000;
1494                                 tsr.word_4 = 0x00000000;
1495                                 *scq->next = tsr;
1496                                 index = (int)scqi;
1497                                 scq->skb[index] = NULL;
1498                                 if (scq->next == scq->last)
1499                                         scq->next = scq->base;
1500                                 else
1501                                         scq->next++;
1502                                 data = scq_virt_to_bus(scq, scq->next);
1503                                 ns_write_sram(card, scq->scd, &data, 1);
1504                         }
1505                         spin_unlock_irqrestore(&scq->lock, flags);
1506                         schedule();
1507                 }
1508
1509                 /* Free all TST entries */
1510                 data = NS_TST_OPCODE_VARIABLE;
1511                 for (i = 0; i < NS_TST_NUM_ENTRIES; i++) {
1512                         if (card->tste2vc[i] == vc) {
1513                                 ns_write_sram(card, card->tst_addr + i, &data,
1514                                               1);
1515                                 card->tste2vc[i] = NULL;
1516                                 card->tst_free_entries++;
1517                         }
1518                 }
1519
1520                 card->scd2vc[(vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE] = NULL;
1521                 free_scq(card, vc->scq, vcc);
1522         }
1523
1524         /* remove all references to vcc before deleting it */
1525         if (vcc->qos.txtp.traffic_class != ATM_NONE) {
1526                 unsigned long flags;
1527                 scq_info *scq = card->scq0;
1528
1529                 spin_lock_irqsave(&scq->lock, flags);
1530
1531                 for (i = 0; i < scq->num_entries; i++) {
1532                         if (scq->skb[i] && ATM_SKB(scq->skb[i])->vcc == vcc) {
1533                                 ATM_SKB(scq->skb[i])->vcc = NULL;
1534                                 atm_return(vcc, scq->skb[i]->truesize);
1535                                 PRINTK
1536                                     ("nicstar: deleted pending vcc mapping\n");
1537                         }
1538                 }
1539
1540                 spin_unlock_irqrestore(&scq->lock, flags);
1541         }
1542
1543         vcc->dev_data = NULL;
1544         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
1545         clear_bit(ATM_VF_ADDR, &vcc->flags);
1546
1547 #ifdef RX_DEBUG
1548         {
1549                 u32 stat, cfg;
1550                 stat = readl(card->membase + STAT);
1551                 cfg = readl(card->membase + CFG);
1552                 printk("STAT = 0x%08X  CFG = 0x%08X  \n", stat, cfg);
1553                 printk
1554                     ("TSQ: base = 0x%p  next = 0x%p  last = 0x%p  TSQT = 0x%08X \n",
1555                      card->tsq.base, card->tsq.next,
1556                      card->tsq.last, readl(card->membase + TSQT));
1557                 printk
1558                     ("RSQ: base = 0x%p  next = 0x%p  last = 0x%p  RSQT = 0x%08X \n",
1559                      card->rsq.base, card->rsq.next,
1560                      card->rsq.last, readl(card->membase + RSQT));
1561                 printk("Empty free buffer queue interrupt %s \n",
1562                        card->efbie ? "enabled" : "disabled");
1563                 printk("SBCNT = %d  count = %d   LBCNT = %d count = %d \n",
1564                        ns_stat_sfbqc_get(stat), card->sbpool.count,
1565                        ns_stat_lfbqc_get(stat), card->lbpool.count);
1566                 printk("hbpool.count = %d  iovpool.count = %d \n",
1567                        card->hbpool.count, card->iovpool.count);
1568         }
1569 #endif /* RX_DEBUG */
1570 }
1571
1572 static void fill_tst(ns_dev * card, int n, vc_map * vc)
1573 {
1574         u32 new_tst;
1575         unsigned long cl;
1576         int e, r;
1577         u32 data;
1578
1579         /* It would be very complicated to keep the two TSTs synchronized while
1580            assuring that writes are only made to the inactive TST. So, for now I
1581            will use only one TST. If problems occur, I will change this again */
1582
1583         new_tst = card->tst_addr;
1584
1585         /* Fill procedure */
1586
1587         for (e = 0; e < NS_TST_NUM_ENTRIES; e++) {
1588                 if (card->tste2vc[e] == NULL)
1589                         break;
1590         }
1591         if (e == NS_TST_NUM_ENTRIES) {
1592                 printk("nicstar%d: No free TST entries found. \n", card->index);
1593                 return;
1594         }
1595
1596         r = n;
1597         cl = NS_TST_NUM_ENTRIES;
1598         data = ns_tste_make(NS_TST_OPCODE_FIXED, vc->cbr_scd);
1599
1600         while (r > 0) {
1601                 if (cl >= NS_TST_NUM_ENTRIES && card->tste2vc[e] == NULL) {
1602                         card->tste2vc[e] = vc;
1603                         ns_write_sram(card, new_tst + e, &data, 1);
1604                         cl -= NS_TST_NUM_ENTRIES;
1605                         r--;
1606                 }
1607
1608                 if (++e == NS_TST_NUM_ENTRIES) {
1609                         e = 0;
1610                 }
1611                 cl += n;
1612         }
1613
1614         /* End of fill procedure */
1615
1616         data = ns_tste_make(NS_TST_OPCODE_END, new_tst);
1617         ns_write_sram(card, new_tst + NS_TST_NUM_ENTRIES, &data, 1);
1618         ns_write_sram(card, card->tst_addr + NS_TST_NUM_ENTRIES, &data, 1);
1619         card->tst_addr = new_tst;
1620 }
1621
1622 static int _ns_send(struct atm_vcc *vcc, struct sk_buff *skb, bool may_sleep)
1623 {
1624         ns_dev *card;
1625         vc_map *vc;
1626         scq_info *scq;
1627         unsigned long buflen;
1628         ns_scqe scqe;
1629         u32 flags;              /* TBD flags, not CPU flags */
1630
1631         card = vcc->dev->dev_data;
1632         TXPRINTK("nicstar%d: ns_send() called.\n", card->index);
1633         if ((vc = (vc_map *) vcc->dev_data) == NULL) {
1634                 printk("nicstar%d: vcc->dev_data == NULL on ns_send().\n",
1635                        card->index);
1636                 atomic_inc(&vcc->stats->tx_err);
1637                 dev_kfree_skb_any(skb);
1638                 return -EINVAL;
1639         }
1640
1641         if (!vc->tx) {
1642                 printk("nicstar%d: Trying to transmit on a non-tx VC.\n",
1643                        card->index);
1644                 atomic_inc(&vcc->stats->tx_err);
1645                 dev_kfree_skb_any(skb);
1646                 return -EINVAL;
1647         }
1648
1649         if (vcc->qos.aal != ATM_AAL5 && vcc->qos.aal != ATM_AAL0) {
1650                 printk("nicstar%d: Only AAL0 and AAL5 are supported.\n",
1651                        card->index);
1652                 atomic_inc(&vcc->stats->tx_err);
1653                 dev_kfree_skb_any(skb);
1654                 return -EINVAL;
1655         }
1656
1657         if (skb_shinfo(skb)->nr_frags != 0) {
1658                 printk("nicstar%d: No scatter-gather yet.\n", card->index);
1659                 atomic_inc(&vcc->stats->tx_err);
1660                 dev_kfree_skb_any(skb);
1661                 return -EINVAL;
1662         }
1663
1664         ATM_SKB(skb)->vcc = vcc;
1665
1666         NS_PRV_DMA(skb) = dma_map_single(&card->pcidev->dev, skb->data,
1667                                          skb->len, DMA_TO_DEVICE);
1668
1669         if (vcc->qos.aal == ATM_AAL5) {
1670                 buflen = (skb->len + 47 + 8) / 48 * 48; /* Multiple of 48 */
1671                 flags = NS_TBD_AAL5;
1672                 scqe.word_2 = cpu_to_le32(NS_PRV_DMA(skb));
1673                 scqe.word_3 = cpu_to_le32(skb->len);
1674                 scqe.word_4 =
1675                     ns_tbd_mkword_4(0, (u32) vcc->vpi, (u32) vcc->vci, 0,
1676                                     ATM_SKB(skb)->
1677                                     atm_options & ATM_ATMOPT_CLP ? 1 : 0);
1678                 flags |= NS_TBD_EOPDU;
1679         } else {                /* (vcc->qos.aal == ATM_AAL0) */
1680
1681                 buflen = ATM_CELL_PAYLOAD;      /* i.e., 48 bytes */
1682                 flags = NS_TBD_AAL0;
1683                 scqe.word_2 = cpu_to_le32(NS_PRV_DMA(skb) + NS_AAL0_HEADER);
1684                 scqe.word_3 = cpu_to_le32(0x00000000);
1685                 if (*skb->data & 0x02)  /* Payload type 1 - end of pdu */
1686                         flags |= NS_TBD_EOPDU;
1687                 scqe.word_4 =
1688                     cpu_to_le32(*((u32 *) skb->data) & ~NS_TBD_VC_MASK);
1689                 /* Force the VPI/VCI to be the same as in VCC struct */
1690                 scqe.word_4 |=
1691                     cpu_to_le32((((u32) vcc->
1692                                   vpi) << NS_TBD_VPI_SHIFT | ((u32) vcc->
1693                                                               vci) <<
1694                                  NS_TBD_VCI_SHIFT) & NS_TBD_VC_MASK);
1695         }
1696
1697         if (vcc->qos.txtp.traffic_class == ATM_CBR) {
1698                 scqe.word_1 = ns_tbd_mkword_1_novbr(flags, (u32) buflen);
1699                 scq = ((vc_map *) vcc->dev_data)->scq;
1700         } else {
1701                 scqe.word_1 =
1702                     ns_tbd_mkword_1(flags, (u32) 1, (u32) 1, (u32) buflen);
1703                 scq = card->scq0;
1704         }
1705
1706         if (push_scqe(card, vc, scq, &scqe, skb, may_sleep) != 0) {
1707                 atomic_inc(&vcc->stats->tx_err);
1708                 dma_unmap_single(&card->pcidev->dev, NS_PRV_DMA(skb), skb->len,
1709                                  DMA_TO_DEVICE);
1710                 dev_kfree_skb_any(skb);
1711                 return -EIO;
1712         }
1713         atomic_inc(&vcc->stats->tx);
1714
1715         return 0;
1716 }
1717
1718 static int ns_send(struct atm_vcc *vcc, struct sk_buff *skb)
1719 {
1720         return _ns_send(vcc, skb, true);
1721 }
1722
1723 static int ns_send_bh(struct atm_vcc *vcc, struct sk_buff *skb)
1724 {
1725         return _ns_send(vcc, skb, false);
1726 }
1727
1728 static int push_scqe(ns_dev * card, vc_map * vc, scq_info * scq, ns_scqe * tbd,
1729                      struct sk_buff *skb, bool may_sleep)
1730 {
1731         unsigned long flags;
1732         ns_scqe tsr;
1733         u32 scdi, scqi;
1734         int scq_is_vbr;
1735         u32 data;
1736         int index;
1737
1738         spin_lock_irqsave(&scq->lock, flags);
1739         while (scq->tail == scq->next) {
1740                 if (!may_sleep) {
1741                         spin_unlock_irqrestore(&scq->lock, flags);
1742                         printk("nicstar%d: Error pushing TBD.\n", card->index);
1743                         return 1;
1744                 }
1745
1746                 scq->full = 1;
1747                 wait_event_interruptible_lock_irq_timeout(scq->scqfull_waitq,
1748                                                           scq->tail != scq->next,
1749                                                           scq->lock,
1750                                                           SCQFULL_TIMEOUT);
1751
1752                 if (scq->full) {
1753                         spin_unlock_irqrestore(&scq->lock, flags);
1754                         printk("nicstar%d: Timeout pushing TBD.\n",
1755                                card->index);
1756                         return 1;
1757                 }
1758         }
1759         *scq->next = *tbd;
1760         index = (int)(scq->next - scq->base);
1761         scq->skb[index] = skb;
1762         XPRINTK("nicstar%d: sending skb at 0x%p (pos %d).\n",
1763                 card->index, skb, index);
1764         XPRINTK("nicstar%d: TBD written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%p.\n",
1765                 card->index, le32_to_cpu(tbd->word_1), le32_to_cpu(tbd->word_2),
1766                 le32_to_cpu(tbd->word_3), le32_to_cpu(tbd->word_4),
1767                 scq->next);
1768         if (scq->next == scq->last)
1769                 scq->next = scq->base;
1770         else
1771                 scq->next++;
1772
1773         vc->tbd_count++;
1774         if (scq->num_entries == VBR_SCQ_NUM_ENTRIES) {
1775                 scq->tbd_count++;
1776                 scq_is_vbr = 1;
1777         } else
1778                 scq_is_vbr = 0;
1779
1780         if (vc->tbd_count >= MAX_TBD_PER_VC
1781             || scq->tbd_count >= MAX_TBD_PER_SCQ) {
1782                 int has_run = 0;
1783
1784                 while (scq->tail == scq->next) {
1785                         if (!may_sleep) {
1786                                 data = scq_virt_to_bus(scq, scq->next);
1787                                 ns_write_sram(card, scq->scd, &data, 1);
1788                                 spin_unlock_irqrestore(&scq->lock, flags);
1789                                 printk("nicstar%d: Error pushing TSR.\n",
1790                                        card->index);
1791                                 return 0;
1792                         }
1793
1794                         scq->full = 1;
1795                         if (has_run++)
1796                                 break;
1797                         wait_event_interruptible_lock_irq_timeout(scq->scqfull_waitq,
1798                                                                   scq->tail != scq->next,
1799                                                                   scq->lock,
1800                                                                   SCQFULL_TIMEOUT);
1801                 }
1802
1803                 if (!scq->full) {
1804                         tsr.word_1 = ns_tsr_mkword_1(NS_TSR_INTENABLE);
1805                         if (scq_is_vbr)
1806                                 scdi = NS_TSR_SCDISVBR;
1807                         else
1808                                 scdi = (vc->cbr_scd - NS_FRSCD) / NS_FRSCD_SIZE;
1809                         scqi = scq->next - scq->base;
1810                         tsr.word_2 = ns_tsr_mkword_2(scdi, scqi);
1811                         tsr.word_3 = 0x00000000;
1812                         tsr.word_4 = 0x00000000;
1813
1814                         *scq->next = tsr;
1815                         index = (int)scqi;
1816                         scq->skb[index] = NULL;
1817                         XPRINTK
1818                             ("nicstar%d: TSR written:\n0x%x\n0x%x\n0x%x\n0x%x\n at 0x%p.\n",
1819                              card->index, le32_to_cpu(tsr.word_1),
1820                              le32_to_cpu(tsr.word_2), le32_to_cpu(tsr.word_3),
1821                              le32_to_cpu(tsr.word_4), scq->next);
1822                         if (scq->next == scq->last)
1823                                 scq->next = scq->base;
1824                         else
1825                                 scq->next++;
1826                         vc->tbd_count = 0;
1827                         scq->tbd_count = 0;
1828                 } else
1829                         PRINTK("nicstar%d: Timeout pushing TSR.\n",
1830                                card->index);
1831         }
1832         data = scq_virt_to_bus(scq, scq->next);
1833         ns_write_sram(card, scq->scd, &data, 1);
1834
1835         spin_unlock_irqrestore(&scq->lock, flags);
1836
1837         return 0;
1838 }
1839
1840 static void process_tsq(ns_dev * card)
1841 {
1842         u32 scdi;
1843         scq_info *scq;
1844         ns_tsi *previous = NULL, *one_ahead, *two_ahead;
1845         int serviced_entries;   /* flag indicating at least on entry was serviced */
1846
1847         serviced_entries = 0;
1848
1849         if (card->tsq.next == card->tsq.last)
1850                 one_ahead = card->tsq.base;
1851         else
1852                 one_ahead = card->tsq.next + 1;
1853
1854         if (one_ahead == card->tsq.last)
1855                 two_ahead = card->tsq.base;
1856         else
1857                 two_ahead = one_ahead + 1;
1858
1859         while (!ns_tsi_isempty(card->tsq.next) || !ns_tsi_isempty(one_ahead) ||
1860                !ns_tsi_isempty(two_ahead))
1861                 /* At most two empty, as stated in the 77201 errata */
1862         {
1863                 serviced_entries = 1;
1864
1865                 /* Skip the one or two possible empty entries */
1866                 while (ns_tsi_isempty(card->tsq.next)) {
1867                         if (card->tsq.next == card->tsq.last)
1868                                 card->tsq.next = card->tsq.base;
1869                         else
1870                                 card->tsq.next++;
1871                 }
1872
1873                 if (!ns_tsi_tmrof(card->tsq.next)) {
1874                         scdi = ns_tsi_getscdindex(card->tsq.next);
1875                         if (scdi == NS_TSI_SCDISVBR)
1876                                 scq = card->scq0;
1877                         else {
1878                                 if (card->scd2vc[scdi] == NULL) {
1879                                         printk
1880                                             ("nicstar%d: could not find VC from SCD index.\n",
1881                                              card->index);
1882                                         ns_tsi_init(card->tsq.next);
1883                                         return;
1884                                 }
1885                                 scq = card->scd2vc[scdi]->scq;
1886                         }
1887                         drain_scq(card, scq, ns_tsi_getscqpos(card->tsq.next));
1888                         scq->full = 0;
1889                         wake_up_interruptible(&(scq->scqfull_waitq));
1890                 }
1891
1892                 ns_tsi_init(card->tsq.next);
1893                 previous = card->tsq.next;
1894                 if (card->tsq.next == card->tsq.last)
1895                         card->tsq.next = card->tsq.base;
1896                 else
1897                         card->tsq.next++;
1898
1899                 if (card->tsq.next == card->tsq.last)
1900                         one_ahead = card->tsq.base;
1901                 else
1902                         one_ahead = card->tsq.next + 1;
1903
1904                 if (one_ahead == card->tsq.last)
1905                         two_ahead = card->tsq.base;
1906                 else
1907                         two_ahead = one_ahead + 1;
1908         }
1909
1910         if (serviced_entries)
1911                 writel(PTR_DIFF(previous, card->tsq.base),
1912                        card->membase + TSQH);
1913 }
1914
1915 static void drain_scq(ns_dev * card, scq_info * scq, int pos)
1916 {
1917         struct atm_vcc *vcc;
1918         struct sk_buff *skb;
1919         int i;
1920         unsigned long flags;
1921
1922         XPRINTK("nicstar%d: drain_scq() called, scq at 0x%p, pos %d.\n",
1923                 card->index, scq, pos);
1924         if (pos >= scq->num_entries) {
1925                 printk("nicstar%d: Bad index on drain_scq().\n", card->index);
1926                 return;
1927         }
1928
1929         spin_lock_irqsave(&scq->lock, flags);
1930         i = (int)(scq->tail - scq->base);
1931         if (++i == scq->num_entries)
1932                 i = 0;
1933         while (i != pos) {
1934                 skb = scq->skb[i];
1935                 XPRINTK("nicstar%d: freeing skb at 0x%p (index %d).\n",
1936                         card->index, skb, i);
1937                 if (skb != NULL) {
1938                         dma_unmap_single(&card->pcidev->dev,
1939                                          NS_PRV_DMA(skb),
1940                                          skb->len,
1941                                          DMA_TO_DEVICE);
1942                         vcc = ATM_SKB(skb)->vcc;
1943                         if (vcc && vcc->pop != NULL) {
1944                                 vcc->pop(vcc, skb);
1945                         } else {
1946                                 dev_kfree_skb_irq(skb);
1947                         }
1948                         scq->skb[i] = NULL;
1949                 }
1950                 if (++i == scq->num_entries)
1951                         i = 0;
1952         }
1953         scq->tail = scq->base + pos;
1954         spin_unlock_irqrestore(&scq->lock, flags);
1955 }
1956
1957 static void process_rsq(ns_dev * card)
1958 {
1959         ns_rsqe *previous;
1960
1961         if (!ns_rsqe_valid(card->rsq.next))
1962                 return;
1963         do {
1964                 dequeue_rx(card, card->rsq.next);
1965                 ns_rsqe_init(card->rsq.next);
1966                 previous = card->rsq.next;
1967                 if (card->rsq.next == card->rsq.last)
1968                         card->rsq.next = card->rsq.base;
1969                 else
1970                         card->rsq.next++;
1971         } while (ns_rsqe_valid(card->rsq.next));
1972         writel(PTR_DIFF(previous, card->rsq.base), card->membase + RSQH);
1973 }
1974
1975 static void dequeue_rx(ns_dev * card, ns_rsqe * rsqe)
1976 {
1977         u32 vpi, vci;
1978         vc_map *vc;
1979         struct sk_buff *iovb;
1980         struct iovec *iov;
1981         struct atm_vcc *vcc;
1982         struct sk_buff *skb;
1983         unsigned short aal5_len;
1984         int len;
1985         u32 stat;
1986         u32 id;
1987
1988         stat = readl(card->membase + STAT);
1989         card->sbfqc = ns_stat_sfbqc_get(stat);
1990         card->lbfqc = ns_stat_lfbqc_get(stat);
1991
1992         id = le32_to_cpu(rsqe->buffer_handle);
1993         skb = idr_remove(&card->idr, id);
1994         if (!skb) {
1995                 RXPRINTK(KERN_ERR
1996                          "nicstar%d: skb not found!\n", card->index);
1997                 return;
1998         }
1999         dma_sync_single_for_cpu(&card->pcidev->dev,
2000                                 NS_PRV_DMA(skb),
2001                                 (NS_PRV_BUFTYPE(skb) == BUF_SM
2002                                  ? NS_SMSKBSIZE : NS_LGSKBSIZE),
2003                                 DMA_FROM_DEVICE);
2004         dma_unmap_single(&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         vpi = ns_rsqe_vpi(rsqe);
2010         vci = ns_rsqe_vci(rsqe);
2011         if (vpi >= 1UL << card->vpibits || vci >= 1UL << card->vcibits) {
2012                 printk("nicstar%d: SDU received for out-of-range vc %d.%d.\n",
2013                        card->index, vpi, vci);
2014                 recycle_rx_buf(card, skb);
2015                 return;
2016         }
2017
2018         vc = &(card->vcmap[vpi << card->vcibits | vci]);
2019         if (!vc->rx) {
2020                 RXPRINTK("nicstar%d: SDU received on non-rx vc %d.%d.\n",
2021                          card->index, vpi, vci);
2022                 recycle_rx_buf(card, skb);
2023                 return;
2024         }
2025
2026         vcc = vc->rx_vcc;
2027
2028         if (vcc->qos.aal == ATM_AAL0) {
2029                 struct sk_buff *sb;
2030                 unsigned char *cell;
2031                 int i;
2032
2033                 cell = skb->data;
2034                 for (i = ns_rsqe_cellcount(rsqe); i; i--) {
2035                         sb = dev_alloc_skb(NS_SMSKBSIZE);
2036                         if (!sb) {
2037                                 printk
2038                                     ("nicstar%d: Can't allocate buffers for aal0.\n",
2039                                      card->index);
2040                                 atomic_add(i, &vcc->stats->rx_drop);
2041                                 break;
2042                         }
2043                         if (!atm_charge(vcc, sb->truesize)) {
2044                                 RXPRINTK
2045                                     ("nicstar%d: atm_charge() dropped aal0 packets.\n",
2046                                      card->index);
2047                                 atomic_add(i - 1, &vcc->stats->rx_drop);        /* already increased by 1 */
2048                                 dev_kfree_skb_any(sb);
2049                                 break;
2050                         }
2051                         /* Rebuild the header */
2052                         *((u32 *) sb->data) = le32_to_cpu(rsqe->word_1) << 4 |
2053                             (ns_rsqe_clp(rsqe) ? 0x00000001 : 0x00000000);
2054                         if (i == 1 && ns_rsqe_eopdu(rsqe))
2055                                 *((u32 *) sb->data) |= 0x00000002;
2056                         skb_put(sb, NS_AAL0_HEADER);
2057                         memcpy(skb_tail_pointer(sb), cell, ATM_CELL_PAYLOAD);
2058                         skb_put(sb, ATM_CELL_PAYLOAD);
2059                         ATM_SKB(sb)->vcc = vcc;
2060                         __net_timestamp(sb);
2061                         vcc->push(vcc, sb);
2062                         atomic_inc(&vcc->stats->rx);
2063                         cell += ATM_CELL_PAYLOAD;
2064                 }
2065
2066                 recycle_rx_buf(card, skb);
2067                 return;
2068         }
2069
2070         /* To reach this point, the AAL layer can only be AAL5 */
2071
2072         if ((iovb = vc->rx_iov) == NULL) {
2073                 iovb = skb_dequeue(&(card->iovpool.queue));
2074                 if (iovb == NULL) {     /* No buffers in the queue */
2075                         iovb = alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC);
2076                         if (iovb == NULL) {
2077                                 printk("nicstar%d: Out of iovec buffers.\n",
2078                                        card->index);
2079                                 atomic_inc(&vcc->stats->rx_drop);
2080                                 recycle_rx_buf(card, skb);
2081                                 return;
2082                         }
2083                         NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2084                 } else if (--card->iovpool.count < card->iovnr.min) {
2085                         struct sk_buff *new_iovb;
2086                         if ((new_iovb =
2087                              alloc_skb(NS_IOVBUFSIZE, GFP_ATOMIC)) != NULL) {
2088                                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2089                                 skb_queue_tail(&card->iovpool.queue, new_iovb);
2090                                 card->iovpool.count++;
2091                         }
2092                 }
2093                 vc->rx_iov = iovb;
2094                 NS_PRV_IOVCNT(iovb) = 0;
2095                 iovb->len = 0;
2096                 iovb->data = iovb->head;
2097                 skb_reset_tail_pointer(iovb);
2098                 /* IMPORTANT: a pointer to the sk_buff containing the small or large
2099                    buffer is stored as iovec base, NOT a pointer to the
2100                    small or large buffer itself. */
2101         } else if (NS_PRV_IOVCNT(iovb) >= NS_MAX_IOVECS) {
2102                 printk("nicstar%d: received too big AAL5 SDU.\n", card->index);
2103                 atomic_inc(&vcc->stats->rx_err);
2104                 recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2105                                       NS_MAX_IOVECS);
2106                 NS_PRV_IOVCNT(iovb) = 0;
2107                 iovb->len = 0;
2108                 iovb->data = iovb->head;
2109                 skb_reset_tail_pointer(iovb);
2110         }
2111         iov = &((struct iovec *)iovb->data)[NS_PRV_IOVCNT(iovb)++];
2112         iov->iov_base = (void *)skb;
2113         iov->iov_len = ns_rsqe_cellcount(rsqe) * 48;
2114         iovb->len += iov->iov_len;
2115
2116 #ifdef EXTRA_DEBUG
2117         if (NS_PRV_IOVCNT(iovb) == 1) {
2118                 if (NS_PRV_BUFTYPE(skb) != BUF_SM) {
2119                         printk
2120                             ("nicstar%d: Expected a small buffer, and this is not one.\n",
2121                              card->index);
2122                         which_list(card, skb);
2123                         atomic_inc(&vcc->stats->rx_err);
2124                         recycle_rx_buf(card, skb);
2125                         vc->rx_iov = NULL;
2126                         recycle_iov_buf(card, iovb);
2127                         return;
2128                 }
2129         } else {                /* NS_PRV_IOVCNT(iovb) >= 2 */
2130
2131                 if (NS_PRV_BUFTYPE(skb) != BUF_LG) {
2132                         printk
2133                             ("nicstar%d: Expected a large buffer, and this is not one.\n",
2134                              card->index);
2135                         which_list(card, skb);
2136                         atomic_inc(&vcc->stats->rx_err);
2137                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2138                                               NS_PRV_IOVCNT(iovb));
2139                         vc->rx_iov = NULL;
2140                         recycle_iov_buf(card, iovb);
2141                         return;
2142                 }
2143         }
2144 #endif /* EXTRA_DEBUG */
2145
2146         if (ns_rsqe_eopdu(rsqe)) {
2147                 /* This works correctly regardless of the endianness of the host */
2148                 unsigned char *L1L2 = (unsigned char *)
2149                                                 (skb->data + iov->iov_len - 6);
2150                 aal5_len = L1L2[0] << 8 | L1L2[1];
2151                 len = (aal5_len == 0x0000) ? 0x10000 : aal5_len;
2152                 if (ns_rsqe_crcerr(rsqe) ||
2153                     len + 8 > iovb->len || len + (47 + 8) < iovb->len) {
2154                         printk("nicstar%d: AAL5 CRC error", card->index);
2155                         if (len + 8 > iovb->len || len + (47 + 8) < iovb->len)
2156                                 printk(" - PDU size mismatch.\n");
2157                         else
2158                                 printk(".\n");
2159                         atomic_inc(&vcc->stats->rx_err);
2160                         recycle_iovec_rx_bufs(card, (struct iovec *)iovb->data,
2161                                               NS_PRV_IOVCNT(iovb));
2162                         vc->rx_iov = NULL;
2163                         recycle_iov_buf(card, iovb);
2164                         return;
2165                 }
2166
2167                 /* By this point we (hopefully) have a complete SDU without errors. */
2168
2169                 if (NS_PRV_IOVCNT(iovb) == 1) { /* Just a small buffer */
2170                         /* skb points to a small buffer */
2171                         if (!atm_charge(vcc, skb->truesize)) {
2172                                 push_rxbufs(card, skb);
2173                                 atomic_inc(&vcc->stats->rx_drop);
2174                         } else {
2175                                 skb_put(skb, len);
2176                                 dequeue_sm_buf(card, skb);
2177                                 ATM_SKB(skb)->vcc = vcc;
2178                                 __net_timestamp(skb);
2179                                 vcc->push(vcc, skb);
2180                                 atomic_inc(&vcc->stats->rx);
2181                         }
2182                 } else if (NS_PRV_IOVCNT(iovb) == 2) {  /* One small plus one large buffer */
2183                         struct sk_buff *sb;
2184
2185                         sb = (struct sk_buff *)(iov - 1)->iov_base;
2186                         /* skb points to a large buffer */
2187
2188                         if (len <= NS_SMBUFSIZE) {
2189                                 if (!atm_charge(vcc, sb->truesize)) {
2190                                         push_rxbufs(card, sb);
2191                                         atomic_inc(&vcc->stats->rx_drop);
2192                                 } else {
2193                                         skb_put(sb, len);
2194                                         dequeue_sm_buf(card, sb);
2195                                         ATM_SKB(sb)->vcc = vcc;
2196                                         __net_timestamp(sb);
2197                                         vcc->push(vcc, sb);
2198                                         atomic_inc(&vcc->stats->rx);
2199                                 }
2200
2201                                 push_rxbufs(card, skb);
2202
2203                         } else {        /* len > NS_SMBUFSIZE, the usual case */
2204
2205                                 if (!atm_charge(vcc, skb->truesize)) {
2206                                         push_rxbufs(card, skb);
2207                                         atomic_inc(&vcc->stats->rx_drop);
2208                                 } else {
2209                                         dequeue_lg_buf(card, skb);
2210                                         skb_push(skb, NS_SMBUFSIZE);
2211                                         skb_copy_from_linear_data(sb, skb->data,
2212                                                                   NS_SMBUFSIZE);
2213                                         skb_put(skb, len - NS_SMBUFSIZE);
2214                                         ATM_SKB(skb)->vcc = vcc;
2215                                         __net_timestamp(skb);
2216                                         vcc->push(vcc, skb);
2217                                         atomic_inc(&vcc->stats->rx);
2218                                 }
2219
2220                                 push_rxbufs(card, sb);
2221
2222                         }
2223
2224                 } else {        /* Must push a huge buffer */
2225
2226                         struct sk_buff *hb, *sb, *lb;
2227                         int remaining, tocopy;
2228                         int j;
2229
2230                         hb = skb_dequeue(&(card->hbpool.queue));
2231                         if (hb == NULL) {       /* No buffers in the queue */
2232
2233                                 hb = dev_alloc_skb(NS_HBUFSIZE);
2234                                 if (hb == NULL) {
2235                                         printk
2236                                             ("nicstar%d: Out of huge buffers.\n",
2237                                              card->index);
2238                                         atomic_inc(&vcc->stats->rx_drop);
2239                                         recycle_iovec_rx_bufs(card,
2240                                                               (struct iovec *)
2241                                                               iovb->data,
2242                                                               NS_PRV_IOVCNT(iovb));
2243                                         vc->rx_iov = NULL;
2244                                         recycle_iov_buf(card, iovb);
2245                                         return;
2246                                 } else if (card->hbpool.count < card->hbnr.min) {
2247                                         struct sk_buff *new_hb;
2248                                         if ((new_hb =
2249                                              dev_alloc_skb(NS_HBUFSIZE)) !=
2250                                             NULL) {
2251                                                 skb_queue_tail(&card->hbpool.
2252                                                                queue, new_hb);
2253                                                 card->hbpool.count++;
2254                                         }
2255                                 }
2256                                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
2257                         } else if (--card->hbpool.count < card->hbnr.min) {
2258                                 struct sk_buff *new_hb;
2259                                 if ((new_hb =
2260                                      dev_alloc_skb(NS_HBUFSIZE)) != NULL) {
2261                                         NS_PRV_BUFTYPE(new_hb) = BUF_NONE;
2262                                         skb_queue_tail(&card->hbpool.queue,
2263                                                        new_hb);
2264                                         card->hbpool.count++;
2265                                 }
2266                                 if (card->hbpool.count < card->hbnr.min) {
2267                                         if ((new_hb =
2268                                              dev_alloc_skb(NS_HBUFSIZE)) !=
2269                                             NULL) {
2270                                                 NS_PRV_BUFTYPE(new_hb) =
2271                                                     BUF_NONE;
2272                                                 skb_queue_tail(&card->hbpool.
2273                                                                queue, new_hb);
2274                                                 card->hbpool.count++;
2275                                         }
2276                                 }
2277                         }
2278
2279                         iov = (struct iovec *)iovb->data;
2280
2281                         if (!atm_charge(vcc, hb->truesize)) {
2282                                 recycle_iovec_rx_bufs(card, iov,
2283                                                       NS_PRV_IOVCNT(iovb));
2284                                 if (card->hbpool.count < card->hbnr.max) {
2285                                         skb_queue_tail(&card->hbpool.queue, hb);
2286                                         card->hbpool.count++;
2287                                 } else
2288                                         dev_kfree_skb_any(hb);
2289                                 atomic_inc(&vcc->stats->rx_drop);
2290                         } else {
2291                                 /* Copy the small buffer to the huge buffer */
2292                                 sb = (struct sk_buff *)iov->iov_base;
2293                                 skb_copy_from_linear_data(sb, hb->data,
2294                                                           iov->iov_len);
2295                                 skb_put(hb, iov->iov_len);
2296                                 remaining = len - iov->iov_len;
2297                                 iov++;
2298                                 /* Free the small buffer */
2299                                 push_rxbufs(card, sb);
2300
2301                                 /* Copy all large buffers to the huge buffer and free them */
2302                                 for (j = 1; j < NS_PRV_IOVCNT(iovb); j++) {
2303                                         lb = (struct sk_buff *)iov->iov_base;
2304                                         tocopy =
2305                                             min_t(int, remaining, iov->iov_len);
2306                                         skb_copy_from_linear_data(lb,
2307                                                                   skb_tail_pointer
2308                                                                   (hb), tocopy);
2309                                         skb_put(hb, tocopy);
2310                                         iov++;
2311                                         remaining -= tocopy;
2312                                         push_rxbufs(card, lb);
2313                                 }
2314 #ifdef EXTRA_DEBUG
2315                                 if (remaining != 0 || hb->len != len)
2316                                         printk
2317                                             ("nicstar%d: Huge buffer len mismatch.\n",
2318                                              card->index);
2319 #endif /* EXTRA_DEBUG */
2320                                 ATM_SKB(hb)->vcc = vcc;
2321                                 __net_timestamp(hb);
2322                                 vcc->push(vcc, hb);
2323                                 atomic_inc(&vcc->stats->rx);
2324                         }
2325                 }
2326
2327                 vc->rx_iov = NULL;
2328                 recycle_iov_buf(card, iovb);
2329         }
2330
2331 }
2332
2333 static void recycle_rx_buf(ns_dev * card, struct sk_buff *skb)
2334 {
2335         if (unlikely(NS_PRV_BUFTYPE(skb) == BUF_NONE)) {
2336                 printk("nicstar%d: What kind of rx buffer is this?\n",
2337                        card->index);
2338                 dev_kfree_skb_any(skb);
2339         } else
2340                 push_rxbufs(card, skb);
2341 }
2342
2343 static void recycle_iovec_rx_bufs(ns_dev * card, struct iovec *iov, int count)
2344 {
2345         while (count-- > 0)
2346                 recycle_rx_buf(card, (struct sk_buff *)(iov++)->iov_base);
2347 }
2348
2349 static void recycle_iov_buf(ns_dev * card, struct sk_buff *iovb)
2350 {
2351         if (card->iovpool.count < card->iovnr.max) {
2352                 skb_queue_tail(&card->iovpool.queue, iovb);
2353                 card->iovpool.count++;
2354         } else
2355                 dev_kfree_skb_any(iovb);
2356 }
2357
2358 static void dequeue_sm_buf(ns_dev * card, struct sk_buff *sb)
2359 {
2360         skb_unlink(sb, &card->sbpool.queue);
2361         if (card->sbfqc < card->sbnr.init) {
2362                 struct sk_buff *new_sb;
2363                 if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL) {
2364                         NS_PRV_BUFTYPE(new_sb) = BUF_SM;
2365                         skb_queue_tail(&card->sbpool.queue, new_sb);
2366                         skb_reserve(new_sb, NS_AAL0_HEADER);
2367                         push_rxbufs(card, new_sb);
2368                 }
2369         }
2370         if (card->sbfqc < card->sbnr.init)
2371         {
2372                 struct sk_buff *new_sb;
2373                 if ((new_sb = dev_alloc_skb(NS_SMSKBSIZE)) != NULL) {
2374                         NS_PRV_BUFTYPE(new_sb) = BUF_SM;
2375                         skb_queue_tail(&card->sbpool.queue, new_sb);
2376                         skb_reserve(new_sb, NS_AAL0_HEADER);
2377                         push_rxbufs(card, new_sb);
2378                 }
2379         }
2380 }
2381
2382 static void dequeue_lg_buf(ns_dev * card, struct sk_buff *lb)
2383 {
2384         skb_unlink(lb, &card->lbpool.queue);
2385         if (card->lbfqc < card->lbnr.init) {
2386                 struct sk_buff *new_lb;
2387                 if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL) {
2388                         NS_PRV_BUFTYPE(new_lb) = BUF_LG;
2389                         skb_queue_tail(&card->lbpool.queue, new_lb);
2390                         skb_reserve(new_lb, NS_SMBUFSIZE);
2391                         push_rxbufs(card, new_lb);
2392                 }
2393         }
2394         if (card->lbfqc < card->lbnr.init)
2395         {
2396                 struct sk_buff *new_lb;
2397                 if ((new_lb = dev_alloc_skb(NS_LGSKBSIZE)) != NULL) {
2398                         NS_PRV_BUFTYPE(new_lb) = BUF_LG;
2399                         skb_queue_tail(&card->lbpool.queue, new_lb);
2400                         skb_reserve(new_lb, NS_SMBUFSIZE);
2401                         push_rxbufs(card, new_lb);
2402                 }
2403         }
2404 }
2405
2406 static int ns_proc_read(struct atm_dev *dev, loff_t * pos, char *page)
2407 {
2408         u32 stat;
2409         ns_dev *card;
2410         int left;
2411
2412         left = (int)*pos;
2413         card = (ns_dev *) dev->dev_data;
2414         stat = readl(card->membase + STAT);
2415         if (!left--)
2416                 return sprintf(page, "Pool   count    min   init    max \n");
2417         if (!left--)
2418                 return sprintf(page, "Small  %5d  %5d  %5d  %5d \n",
2419                                ns_stat_sfbqc_get(stat), card->sbnr.min,
2420                                card->sbnr.init, card->sbnr.max);
2421         if (!left--)
2422                 return sprintf(page, "Large  %5d  %5d  %5d  %5d \n",
2423                                ns_stat_lfbqc_get(stat), card->lbnr.min,
2424                                card->lbnr.init, card->lbnr.max);
2425         if (!left--)
2426                 return sprintf(page, "Huge   %5d  %5d  %5d  %5d \n",
2427                                card->hbpool.count, card->hbnr.min,
2428                                card->hbnr.init, card->hbnr.max);
2429         if (!left--)
2430                 return sprintf(page, "Iovec  %5d  %5d  %5d  %5d \n",
2431                                card->iovpool.count, card->iovnr.min,
2432                                card->iovnr.init, card->iovnr.max);
2433         if (!left--) {
2434                 int retval;
2435                 retval =
2436                     sprintf(page, "Interrupt counter: %u \n", card->intcnt);
2437                 card->intcnt = 0;
2438                 return retval;
2439         }
2440 #if 0
2441         /* Dump 25.6 Mbps PHY registers */
2442         /* Now there's a 25.6 Mbps PHY driver this code isn't needed. I left it
2443            here just in case it's needed for debugging. */
2444         if (card->max_pcr == ATM_25_PCR && !left--) {
2445                 u32 phy_regs[4];
2446                 u32 i;
2447
2448                 for (i = 0; i < 4; i++) {
2449                         while (CMD_BUSY(card)) ;
2450                         writel(NS_CMD_READ_UTILITY | 0x00000200 | i,
2451                                card->membase + CMD);
2452                         while (CMD_BUSY(card)) ;
2453                         phy_regs[i] = readl(card->membase + DR0) & 0x000000FF;
2454                 }
2455
2456                 return sprintf(page, "PHY regs: 0x%02X 0x%02X 0x%02X 0x%02X \n",
2457                                phy_regs[0], phy_regs[1], phy_regs[2],
2458                                phy_regs[3]);
2459         }
2460 #endif /* 0 - Dump 25.6 Mbps PHY registers */
2461 #if 0
2462         /* Dump TST */
2463         if (left-- < NS_TST_NUM_ENTRIES) {
2464                 if (card->tste2vc[left + 1] == NULL)
2465                         return sprintf(page, "%5d - VBR/UBR \n", left + 1);
2466                 else
2467                         return sprintf(page, "%5d - %d %d \n", left + 1,
2468                                        card->tste2vc[left + 1]->tx_vcc->vpi,
2469                                        card->tste2vc[left + 1]->tx_vcc->vci);
2470         }
2471 #endif /* 0 */
2472         return 0;
2473 }
2474
2475 static int ns_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg)
2476 {
2477         ns_dev *card;
2478         pool_levels pl;
2479         long btype;
2480         unsigned long flags;
2481
2482         card = dev->dev_data;
2483         switch (cmd) {
2484         case NS_GETPSTAT:
2485                 if (get_user
2486                     (pl.buftype, &((pool_levels __user *) arg)->buftype))
2487                         return -EFAULT;
2488                 switch (pl.buftype) {
2489                 case NS_BUFTYPE_SMALL:
2490                         pl.count =
2491                             ns_stat_sfbqc_get(readl(card->membase + STAT));
2492                         pl.level.min = card->sbnr.min;
2493                         pl.level.init = card->sbnr.init;
2494                         pl.level.max = card->sbnr.max;
2495                         break;
2496
2497                 case NS_BUFTYPE_LARGE:
2498                         pl.count =
2499                             ns_stat_lfbqc_get(readl(card->membase + STAT));
2500                         pl.level.min = card->lbnr.min;
2501                         pl.level.init = card->lbnr.init;
2502                         pl.level.max = card->lbnr.max;
2503                         break;
2504
2505                 case NS_BUFTYPE_HUGE:
2506                         pl.count = card->hbpool.count;
2507                         pl.level.min = card->hbnr.min;
2508                         pl.level.init = card->hbnr.init;
2509                         pl.level.max = card->hbnr.max;
2510                         break;
2511
2512                 case NS_BUFTYPE_IOVEC:
2513                         pl.count = card->iovpool.count;
2514                         pl.level.min = card->iovnr.min;
2515                         pl.level.init = card->iovnr.init;
2516                         pl.level.max = card->iovnr.max;
2517                         break;
2518
2519                 default:
2520                         return -ENOIOCTLCMD;
2521
2522                 }
2523                 if (!copy_to_user((pool_levels __user *) arg, &pl, sizeof(pl)))
2524                         return (sizeof(pl));
2525                 else
2526                         return -EFAULT;
2527
2528         case NS_SETBUFLEV:
2529                 if (!capable(CAP_NET_ADMIN))
2530                         return -EPERM;
2531                 if (copy_from_user(&pl, (pool_levels __user *) arg, sizeof(pl)))
2532                         return -EFAULT;
2533                 if (pl.level.min >= pl.level.init
2534                     || pl.level.init >= pl.level.max)
2535                         return -EINVAL;
2536                 if (pl.level.min == 0)
2537                         return -EINVAL;
2538                 switch (pl.buftype) {
2539                 case NS_BUFTYPE_SMALL:
2540                         if (pl.level.max > TOP_SB)
2541                                 return -EINVAL;
2542                         card->sbnr.min = pl.level.min;
2543                         card->sbnr.init = pl.level.init;
2544                         card->sbnr.max = pl.level.max;
2545                         break;
2546
2547                 case NS_BUFTYPE_LARGE:
2548                         if (pl.level.max > TOP_LB)
2549                                 return -EINVAL;
2550                         card->lbnr.min = pl.level.min;
2551                         card->lbnr.init = pl.level.init;
2552                         card->lbnr.max = pl.level.max;
2553                         break;
2554
2555                 case NS_BUFTYPE_HUGE:
2556                         if (pl.level.max > TOP_HB)
2557                                 return -EINVAL;
2558                         card->hbnr.min = pl.level.min;
2559                         card->hbnr.init = pl.level.init;
2560                         card->hbnr.max = pl.level.max;
2561                         break;
2562
2563                 case NS_BUFTYPE_IOVEC:
2564                         if (pl.level.max > TOP_IOVB)
2565                                 return -EINVAL;
2566                         card->iovnr.min = pl.level.min;
2567                         card->iovnr.init = pl.level.init;
2568                         card->iovnr.max = pl.level.max;
2569                         break;
2570
2571                 default:
2572                         return -EINVAL;
2573
2574                 }
2575                 return 0;
2576
2577         case NS_ADJBUFLEV:
2578                 if (!capable(CAP_NET_ADMIN))
2579                         return -EPERM;
2580                 btype = (long)arg;      /* a long is the same size as a pointer or bigger */
2581                 switch (btype) {
2582                 case NS_BUFTYPE_SMALL:
2583                         while (card->sbfqc < card->sbnr.init) {
2584                                 struct sk_buff *sb;
2585
2586                                 sb = __dev_alloc_skb(NS_SMSKBSIZE, GFP_KERNEL);
2587                                 if (sb == NULL)
2588                                         return -ENOMEM;
2589                                 NS_PRV_BUFTYPE(sb) = BUF_SM;
2590                                 skb_queue_tail(&card->sbpool.queue, sb);
2591                                 skb_reserve(sb, NS_AAL0_HEADER);
2592                                 push_rxbufs(card, sb);
2593                         }
2594                         break;
2595
2596                 case NS_BUFTYPE_LARGE:
2597                         while (card->lbfqc < card->lbnr.init) {
2598                                 struct sk_buff *lb;
2599
2600                                 lb = __dev_alloc_skb(NS_LGSKBSIZE, GFP_KERNEL);
2601                                 if (lb == NULL)
2602                                         return -ENOMEM;
2603                                 NS_PRV_BUFTYPE(lb) = BUF_LG;
2604                                 skb_queue_tail(&card->lbpool.queue, lb);
2605                                 skb_reserve(lb, NS_SMBUFSIZE);
2606                                 push_rxbufs(card, lb);
2607                         }
2608                         break;
2609
2610                 case NS_BUFTYPE_HUGE:
2611                         while (card->hbpool.count > card->hbnr.init) {
2612                                 struct sk_buff *hb;
2613
2614                                 spin_lock_irqsave(&card->int_lock, flags);
2615                                 hb = skb_dequeue(&card->hbpool.queue);
2616                                 card->hbpool.count--;
2617                                 spin_unlock_irqrestore(&card->int_lock, flags);
2618                                 if (hb == NULL)
2619                                         printk
2620                                             ("nicstar%d: huge buffer count inconsistent.\n",
2621                                              card->index);
2622                                 else
2623                                         dev_kfree_skb_any(hb);
2624
2625                         }
2626                         while (card->hbpool.count < card->hbnr.init) {
2627                                 struct sk_buff *hb;
2628
2629                                 hb = __dev_alloc_skb(NS_HBUFSIZE, GFP_KERNEL);
2630                                 if (hb == NULL)
2631                                         return -ENOMEM;
2632                                 NS_PRV_BUFTYPE(hb) = BUF_NONE;
2633                                 spin_lock_irqsave(&card->int_lock, flags);
2634                                 skb_queue_tail(&card->hbpool.queue, hb);
2635                                 card->hbpool.count++;
2636                                 spin_unlock_irqrestore(&card->int_lock, flags);
2637                         }
2638                         break;
2639
2640                 case NS_BUFTYPE_IOVEC:
2641                         while (card->iovpool.count > card->iovnr.init) {
2642                                 struct sk_buff *iovb;
2643
2644                                 spin_lock_irqsave(&card->int_lock, flags);
2645                                 iovb = skb_dequeue(&card->iovpool.queue);
2646                                 card->iovpool.count--;
2647                                 spin_unlock_irqrestore(&card->int_lock, flags);
2648                                 if (iovb == NULL)
2649                                         printk
2650                                             ("nicstar%d: iovec buffer count inconsistent.\n",
2651                                              card->index);
2652                                 else
2653                                         dev_kfree_skb_any(iovb);
2654
2655                         }
2656                         while (card->iovpool.count < card->iovnr.init) {
2657                                 struct sk_buff *iovb;
2658
2659                                 iovb = alloc_skb(NS_IOVBUFSIZE, GFP_KERNEL);
2660                                 if (iovb == NULL)
2661                                         return -ENOMEM;
2662                                 NS_PRV_BUFTYPE(iovb) = BUF_NONE;
2663                                 spin_lock_irqsave(&card->int_lock, flags);
2664                                 skb_queue_tail(&card->iovpool.queue, iovb);
2665                                 card->iovpool.count++;
2666                                 spin_unlock_irqrestore(&card->int_lock, flags);
2667                         }
2668                         break;
2669
2670                 default:
2671                         return -EINVAL;
2672
2673                 }
2674                 return 0;
2675
2676         default:
2677                 if (dev->phy && dev->phy->ioctl) {
2678                         return dev->phy->ioctl(dev, cmd, arg);
2679                 } else {
2680                         printk("nicstar%d: %s == NULL \n", card->index,
2681                                dev->phy ? "dev->phy->ioctl" : "dev->phy");
2682                         return -ENOIOCTLCMD;
2683                 }
2684         }
2685 }
2686
2687 #ifdef EXTRA_DEBUG
2688 static void which_list(ns_dev * card, struct sk_buff *skb)
2689 {
2690         printk("skb buf_type: 0x%08x\n", NS_PRV_BUFTYPE(skb));
2691 }
2692 #endif /* EXTRA_DEBUG */
2693
2694 static void ns_poll(struct timer_list *unused)
2695 {
2696         int i;
2697         ns_dev *card;
2698         unsigned long flags;
2699         u32 stat_r, stat_w;
2700
2701         PRINTK("nicstar: Entering ns_poll().\n");
2702         for (i = 0; i < num_cards; i++) {
2703                 card = cards[i];
2704                 if (!spin_trylock_irqsave(&card->int_lock, flags)) {
2705                         /* Probably it isn't worth spinning */
2706                         continue;
2707                 }
2708
2709                 stat_w = 0;
2710                 stat_r = readl(card->membase + STAT);
2711                 if (stat_r & NS_STAT_TSIF)
2712                         stat_w |= NS_STAT_TSIF;
2713                 if (stat_r & NS_STAT_EOPDU)
2714                         stat_w |= NS_STAT_EOPDU;
2715
2716                 process_tsq(card);
2717                 process_rsq(card);
2718
2719                 writel(stat_w, card->membase + STAT);
2720                 spin_unlock_irqrestore(&card->int_lock, flags);
2721         }
2722         mod_timer(&ns_timer, jiffies + NS_POLL_PERIOD);
2723         PRINTK("nicstar: Leaving ns_poll().\n");
2724 }
2725
2726 static void ns_phy_put(struct atm_dev *dev, unsigned char value,
2727                        unsigned long addr)
2728 {
2729         ns_dev *card;
2730         unsigned long flags;
2731
2732         card = dev->dev_data;
2733         spin_lock_irqsave(&card->res_lock, flags);
2734         while (CMD_BUSY(card)) ;
2735         writel((u32) value, card->membase + DR0);
2736         writel(NS_CMD_WRITE_UTILITY | 0x00000200 | (addr & 0x000000FF),
2737                card->membase + CMD);
2738         spin_unlock_irqrestore(&card->res_lock, flags);
2739 }
2740
2741 static unsigned char ns_phy_get(struct atm_dev *dev, unsigned long addr)
2742 {
2743         ns_dev *card;
2744         unsigned long flags;
2745         u32 data;
2746
2747         card = dev->dev_data;
2748         spin_lock_irqsave(&card->res_lock, flags);
2749         while (CMD_BUSY(card)) ;
2750         writel(NS_CMD_READ_UTILITY | 0x00000200 | (addr & 0x000000FF),
2751                card->membase + CMD);
2752         while (CMD_BUSY(card)) ;
2753         data = readl(card->membase + DR0) & 0x000000FF;
2754         spin_unlock_irqrestore(&card->res_lock, flags);
2755         return (unsigned char)data;
2756 }
2757
2758 module_init(nicstar_init);
2759 module_exit(nicstar_cleanup);