drivers/net/sb1000.c

   1 /* sb1000.c: A General Instruments SB1000 driver for linux. */
   2 /*
   3         Written 1998 by Franco Venturi.
   4
   5         Copyright 1998 by Franco Venturi.
   6         Copyright 1994,1995 by Donald Becker.
   7         Copyright 1993 United States Government as represented by the
   8         Director, National Security Agency.
   9
  10         This driver is for the General Instruments SB1000 (internal SURFboard)
  11
  12         The author may be reached as fventuri@mediaone.net
  13
  14         This program is free software; you can redistribute it
  15         and/or  modify it under  the terms of  the GNU General
  16         Public  License as  published  by  the  Free  Software
  17         Foundation;  either  version 2 of the License, or  (at
  18         your option) any later version.
  19
  20         Changes:
  21
  22         981115 Steven Hirsch <shirsch@adelphia.net>
  23
  24         Linus changed the timer interface.  Should work on all recent
  25         development kernels.
  26
  27         980608 Steven Hirsch <shirsch@adelphia.net>
  28
  29         Small changes to make it work with 2.1.x kernels. Hopefully,
  30         nothing major will change before official release of Linux 2.2.
  31
  32         Merged with 2.2 - Alan Cox
  33 */
  34
  35 static char version[] = "sb1000.c:v1.1.2 6/01/98 (fventuri@mediaone.net)\n";
  36
  37 #include <linux/module.h>
  38 #include <linux/kernel.h>
  39 #include <linux/string.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/errno.h>
  42 #include <linux/if_cablemodem.h> /* for SIOGCM/SIOSCM stuff */
  43 #include <linux/in.h>
  44 #include <linux/slab.h>
  45 #include <linux/ioport.h>
  46 #include <linux/netdevice.h>
  47 #include <linux/if_arp.h>
  48 #include <linux/skbuff.h>
  49 #include <linux/delay.h>        /* for udelay() */
  50 #include <linux/etherdevice.h>
  51 #include <linux/pnp.h>
  52 #include <linux/init.h>
  53 #include <linux/bitops.h>
  54
  55 #include <asm/io.h>
  56 #include <asm/processor.h>
  57 #include <asm/uaccess.h>
  58
  59 #ifdef SB1000_DEBUG
  60 static int sb1000_debug = SB1000_DEBUG;
  61 #else
  62 static const int sb1000_debug = 1;
  63 #endif
  64
  65 static const int SB1000_IO_EXTENT = 8;
  66 /* SB1000 Maximum Receive Unit */
  67 static const int SB1000_MRU = 1500; /* octects */
  68
  69 #define NPIDS 4
  70 struct sb1000_private {
  71         struct sk_buff *rx_skb[NPIDS];
  72         short rx_dlen[NPIDS];
  73         unsigned int rx_frames;
  74         short rx_error_count;
  75         short rx_error_dpc_count;
  76         unsigned char rx_session_id[NPIDS];
  77         unsigned char rx_frame_id[NPIDS];
  78         unsigned char rx_pkt_type[NPIDS];
  79 };
  80
  81 /* prototypes for Linux interface */
  82 extern int sb1000_probe(struct net_device *dev);
  83 static int sb1000_open(struct net_device *dev);
  84 static int sb1000_dev_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd);
  85 static int sb1000_start_xmit(struct sk_buff *skb, struct net_device *dev);
  86 static irqreturn_t sb1000_interrupt(int irq, void *dev_id);
  87 static int sb1000_close(struct net_device *dev);
  88
  89
  90 /* SB1000 hardware routines to be used during open/configuration phases */
  91 static int card_wait_for_busy_clear(const int ioaddr[],
  92         const char* name);
  93 static int card_wait_for_ready(const int ioaddr[], const char* name,
  94         unsigned char in[]);
  95 static int card_send_command(const int ioaddr[], const char* name,
  96         const unsigned char out[], unsigned char in[]);
  97
  98 /* SB1000 hardware routines to be used during frame rx interrupt */
  99 static int sb1000_wait_for_ready(const int ioaddr[], const char* name);
 100 static int sb1000_wait_for_ready_clear(const int ioaddr[],
 101         const char* name);
 102 static void sb1000_send_command(const int ioaddr[], const char* name,
 103         const unsigned char out[]);
 104 static void sb1000_read_status(const int ioaddr[], unsigned char in[]);
 105 static void sb1000_issue_read_command(const int ioaddr[],
 106         const char* name);
 107
 108 /* SB1000 commands for open/configuration */
 109 static int sb1000_reset(const int ioaddr[], const char* name);
 110 static int sb1000_check_CRC(const int ioaddr[], const char* name);
 111 static inline int sb1000_start_get_set_command(const int ioaddr[],
 112         const char* name);
 113 static int sb1000_end_get_set_command(const int ioaddr[],
 114         const char* name);
 115 static int sb1000_activate(const int ioaddr[], const char* name);
 116 static int sb1000_get_firmware_version(const int ioaddr[],
 117         const char* name, unsigned char version[], int do_end);
 118 static int sb1000_get_frequency(const int ioaddr[], const char* name,
 119         int* frequency);
 120 static int sb1000_set_frequency(const int ioaddr[], const char* name,
 121         int frequency);
 122 static int sb1000_get_PIDs(const int ioaddr[], const char* name,
 123         short PID[]);
 124 static int sb1000_set_PIDs(const int ioaddr[], const char* name,
 125         const short PID[]);
 126
 127 /* SB1000 commands for frame rx interrupt */
 128 static int sb1000_rx(struct net_device *dev);
 129 static void sb1000_error_dpc(struct net_device *dev);
 130
 131 static const struct pnp_device_id sb1000_pnp_ids[] = {
 132         { "GIC1000", 0 },
 133         { "", 0 }
 134 };
 135 MODULE_DEVICE_TABLE(pnp, sb1000_pnp_ids);
 136
 137 static const struct net_device_ops sb1000_netdev_ops = {
 138         .ndo_open               = sb1000_open,
 139         .ndo_start_xmit         = sb1000_start_xmit,
 140         .ndo_do_ioctl           = sb1000_dev_ioctl,
 141         .ndo_stop               = sb1000_close,
 142         .ndo_change_mtu         = eth_change_mtu,
 143         .ndo_set_mac_address    = eth_mac_addr,
 144         .ndo_validate_addr      = eth_validate_addr,
 145 };
 146
 147 static int
 148 sb1000_probe_one(struct pnp_dev *pdev, const struct pnp_device_id *id)
 149 {
 150         struct net_device *dev;
 151         unsigned short ioaddr[2], irq;
 152         unsigned int serial_number;
 153         int error = -ENODEV;
 154
 155         if (pnp_device_attach(pdev) < 0)
 156                 return -ENODEV;
 157         if (pnp_activate_dev(pdev) < 0)
 158                 goto out_detach;
 159
 160         if (!pnp_port_valid(pdev, 0) || !pnp_port_valid(pdev, 1))
 161                 goto out_disable;
 162         if (!pnp_irq_valid(pdev, 0))
 163                 goto out_disable;
 164
 165         serial_number = pdev->card->serial;
 166
 167         ioaddr[0] = pnp_port_start(pdev, 0);
 168         ioaddr[1] = pnp_port_start(pdev, 0);
 169
 170         irq = pnp_irq(pdev, 0);
 171
 172         if (!request_region(ioaddr[0], 16, "sb1000"))
 173                 goto out_disable;
 174         if (!request_region(ioaddr[1], 16, "sb1000"))
 175                 goto out_release_region0;
 176
 177         dev = alloc_etherdev(sizeof(struct sb1000_private));
 178         if (!dev) {
 179                 error = -ENOMEM;
 180                 goto out_release_regions;
 181         }
 182
 183
 184         dev->base_addr = ioaddr[0];
 185         /* mem_start holds the second I/O address */
 186         dev->mem_start = ioaddr[1];
 187         dev->irq = irq;
 188
 189         if (sb1000_debug > 0)
 190                 printk(KERN_NOTICE "%s: sb1000 at (%#3.3lx,%#3.3lx), "
 191                         "S/N %#8.8x, IRQ %d.\n", dev->name, dev->base_addr,
 192                         dev->mem_start, serial_number, dev->irq);
 193
 194         /*
 195          * The SB1000 is an rx-only cable modem device.  The uplink is a modem
 196          * and we do not want to arp on it.
 197          */
 198         dev->flags = IFF_POINTOPOINT|IFF_NOARP;
 199
 200         SET_NETDEV_DEV(dev, &pdev->dev);
 201
 202         if (sb1000_debug > 0)
 203                 printk(KERN_NOTICE "%s", version);
 204
 205         dev->netdev_ops = &sb1000_netdev_ops;
 206
 207         /* hardware address is 0:0:serial_number */
 208         dev->dev_addr[2]        = serial_number >> 24 & 0xff;
 209         dev->dev_addr[3]        = serial_number >> 16 & 0xff;
 210         dev->dev_addr[4]        = serial_number >>  8 & 0xff;
 211         dev->dev_addr[5]        = serial_number >>  0 & 0xff;
 212
 213         pnp_set_drvdata(pdev, dev);
 214
 215         error = register_netdev(dev);
 216         if (error)
 217                 goto out_free_netdev;
 218         return 0;
 219
 220  out_free_netdev:
 221         free_netdev(dev);
 222  out_release_regions:
 223         release_region(ioaddr[1], 16);
 224  out_release_region0:
 225         release_region(ioaddr[0], 16);
 226  out_disable:
 227         pnp_disable_dev(pdev);
 228  out_detach:
 229         pnp_device_detach(pdev);
 230         return error;
 231 }
 232
 233 static void
 234 sb1000_remove_one(struct pnp_dev *pdev)
 235 {
 236         struct net_device *dev = pnp_get_drvdata(pdev);
 237
 238         unregister_netdev(dev);
 239         release_region(dev->base_addr, 16);
 240         release_region(dev->mem_start, 16);
 241         free_netdev(dev);
 242 }
 243
 244 static struct pnp_driver sb1000_driver = {
 245         .name           = "sb1000",
 246         .id_table       = sb1000_pnp_ids,
 247         .probe          = sb1000_probe_one,
 248         .remove         = sb1000_remove_one,
 249 };
 250
 251
 252 /*
 253  * SB1000 hardware routines to be used during open/configuration phases
 254  */
 255
 256 static const int TimeOutJiffies = (875 * HZ) / 100;
 257
 258 /* Card Wait For Busy Clear (cannot be used during an interrupt) */
 259 static int
 260 card_wait_for_busy_clear(const int ioaddr[], const char* name)
 261 {
 262         unsigned char a;
 263         unsigned long timeout;
 264
 265         a = inb(ioaddr[0] + 7);
 266         timeout = jiffies + TimeOutJiffies;
 267         while (a & 0x80 || a & 0x40) {
 268                 /* a little sleep */
 269                 yield();
 270
 271                 a = inb(ioaddr[0] + 7);
 272                 if (time_after_eq(jiffies, timeout)) {
 273                         printk(KERN_WARNING "%s: card_wait_for_busy_clear timeout\n",
 274                                 name);
 275                         return -ETIME;
 276                 }
 277         }
 278
 279         return 0;
 280 }
 281
 282 /* Card Wait For Ready (cannot be used during an interrupt) */
 283 static int
 284 card_wait_for_ready(const int ioaddr[], const char* name, unsigned char in[])
 285 {
 286         unsigned char a;
 287         unsigned long timeout;
 288
 289         a = inb(ioaddr[1] + 6);
 290         timeout = jiffies + TimeOutJiffies;
 291         while (a & 0x80 || !(a & 0x40)) {
 292                 /* a little sleep */
 293                 yield();
 294
 295                 a = inb(ioaddr[1] + 6);
 296                 if (time_after_eq(jiffies, timeout)) {
 297                         printk(KERN_WARNING "%s: card_wait_for_ready timeout\n",
 298                                 name);
 299                         return -ETIME;
 300                 }
 301         }
 302
 303         in[1] = inb(ioaddr[0] + 1);
 304         in[2] = inb(ioaddr[0] + 2);
 305         in[3] = inb(ioaddr[0] + 3);
 306         in[4] = inb(ioaddr[0] + 4);
 307         in[0] = inb(ioaddr[0] + 5);
 308         in[6] = inb(ioaddr[0] + 6);
 309         in[5] = inb(ioaddr[1] + 6);
 310         return 0;
 311 }
 312
 313 /* Card Send Command (cannot be used during an interrupt) */
 314 static int
 315 card_send_command(const int ioaddr[], const char* name,
 316         const unsigned char out[], unsigned char in[])
 317 {
 318         int status, x;
 319
 320         if ((status = card_wait_for_busy_clear(ioaddr, name)))
 321                 return status;
 322         outb(0xa0, ioaddr[0] + 6);
 323         outb(out[2], ioaddr[0] + 1);
 324         outb(out[3], ioaddr[0] + 2);
 325         outb(out[4], ioaddr[0] + 3);
 326         outb(out[5], ioaddr[0] + 4);
 327         outb(out[1], ioaddr[0] + 5);
 328         outb(0xa0, ioaddr[0] + 6);
 329         outb(out[0], ioaddr[0] + 7);
 330         if (out[0] != 0x20 && out[0] != 0x30) {
 331                 if ((status = card_wait_for_ready(ioaddr, name, in)))
 332                         return status;
 333                 inb(ioaddr[0] + 7);
 334                 if (sb1000_debug > 3)
 335                         printk(KERN_DEBUG "%s: card_send_command "
 336                                 "out: %02x%02x%02x%02x%02x%02x  "
 337                                 "in: %02x%02x%02x%02x%02x%02x%02x\n", name,
 338                                 out[0], out[1], out[2], out[3], out[4], out[5],
 339                                 in[0], in[1], in[2], in[3], in[4], in[5], in[6]);
 340         } else {
 341                 if (sb1000_debug > 3)
 342                         printk(KERN_DEBUG "%s: card_send_command "
 343                                 "out: %02x%02x%02x%02x%02x%02x\n", name,
 344                                 out[0], out[1], out[2], out[3], out[4], out[5]);
 345         }
 346
 347         if (out[1] == 0x1b) {
 348                 x = (out[2] == 0x02);
 349         } else {
 350                 if (out[0] >= 0x80 && in[0] != (out[1] | 0x80))
 351                         return -EIO;
 352         }
 353         return 0;
 354 }
 355
 356
 357 /*
 358  * SB1000 hardware routines to be used during frame rx interrupt
 359  */
 360 static const int Sb1000TimeOutJiffies = 7 * HZ;
 361
 362 /* Card Wait For Ready (to be used during frame rx) */
 363 static int
 364 sb1000_wait_for_ready(const int ioaddr[], const char* name)
 365 {
 366         unsigned long timeout;
 367
 368         timeout = jiffies + Sb1000TimeOutJiffies;
 369         while (inb(ioaddr[1] + 6) & 0x80) {
 370                 if (time_after_eq(jiffies, timeout)) {
 371                         printk(KERN_WARNING "%s: sb1000_wait_for_ready timeout\n",
 372                                 name);
 373                         return -ETIME;
 374                 }
 375         }
 376         timeout = jiffies + Sb1000TimeOutJiffies;
 377         while (!(inb(ioaddr[1] + 6) & 0x40)) {
 378                 if (time_after_eq(jiffies, timeout)) {
 379                         printk(KERN_WARNING "%s: sb1000_wait_for_ready timeout\n",
 380                                 name);
 381                         return -ETIME;
 382                 }
 383         }
 384         inb(ioaddr[0] + 7);
 385         return 0;
 386 }
 387
 388 /* Card Wait For Ready Clear (to be used during frame rx) */
 389 static int
 390 sb1000_wait_for_ready_clear(const int ioaddr[], const char* name)
 391 {
 392         unsigned long timeout;
 393
 394         timeout = jiffies + Sb1000TimeOutJiffies;
 395         while (inb(ioaddr[1] + 6) & 0x80) {
 396                 if (time_after_eq(jiffies, timeout)) {
 397                         printk(KERN_WARNING "%s: sb1000_wait_for_ready_clear timeout\n",
 398                                 name);
 399                         return -ETIME;
 400                 }
 401         }
 402         timeout = jiffies + Sb1000TimeOutJiffies;
 403         while (inb(ioaddr[1] + 6) & 0x40) {
 404                 if (time_after_eq(jiffies, timeout)) {
 405                         printk(KERN_WARNING "%s: sb1000_wait_for_ready_clear timeout\n",
 406                                 name);
 407                         return -ETIME;
 408                 }
 409         }
 410         return 0;
 411 }
 412
 413 /* Card Send Command (to be used during frame rx) */
 414 static void
 415 sb1000_send_command(const int ioaddr[], const char* name,
 416         const unsigned char out[])
 417 {
 418         outb(out[2], ioaddr[0] + 1);
 419         outb(out[3], ioaddr[0] + 2);
 420         outb(out[4], ioaddr[0] + 3);
 421         outb(out[5], ioaddr[0] + 4);
 422         outb(out[1], ioaddr[0] + 5);
 423         outb(out[0], ioaddr[0] + 7);
 424         if (sb1000_debug > 3)
 425                 printk(KERN_DEBUG "%s: sb1000_send_command out: %02x%02x%02x%02x"
 426                         "%02x%02x\n", name, out[0], out[1], out[2], out[3], out[4], out[5]);
 427         return;
 428 }
 429
 430 /* Card Read Status (to be used during frame rx) */
 431 static void
 432 sb1000_read_status(const int ioaddr[], unsigned char in[])
 433 {
 434         in[1] = inb(ioaddr[0] + 1);
 435         in[2] = inb(ioaddr[0] + 2);
 436         in[3] = inb(ioaddr[0] + 3);
 437         in[4] = inb(ioaddr[0] + 4);
 438         in[0] = inb(ioaddr[0] + 5);
 439         return;
 440 }
 441
 442 /* Issue Read Command (to be used during frame rx) */
 443 static void
 444 sb1000_issue_read_command(const int ioaddr[], const char* name)
 445 {
 446         static const unsigned char Command0[6] = {0x20, 0x00, 0x00, 0x01, 0x00, 0x00};
 447
 448         sb1000_wait_for_ready_clear(ioaddr, name);
 449         outb(0xa0, ioaddr[0] + 6);
 450         sb1000_send_command(ioaddr, name, Command0);
 451         return;
 452 }
 453
 454
 455 /*
 456  * SB1000 commands for open/configuration
 457  */
 458 /* reset SB1000 card */
 459 static int
 460 sb1000_reset(const int ioaddr[], const char* name)
 461 {
 462         static const unsigned char Command0[6] = {0x80, 0x16, 0x00, 0x00, 0x00, 0x00};
 463
 464         unsigned char st[7];
 465         int port, status;
 466
 467         port = ioaddr[1] + 6;
 468         outb(0x4, port);
 469         inb(port);
 470         udelay(1000);
 471         outb(0x0, port);
 472         inb(port);
 473         ssleep(1);
 474         outb(0x4, port);
 475         inb(port);
 476         udelay(1000);
 477         outb(0x0, port);
 478         inb(port);
 479         udelay(0);
 480
 481         if ((status = card_send_command(ioaddr, name, Command0, st)))
 482                 return status;
 483         if (st[3] != 0xf0)
 484                 return -EIO;
 485         return 0;
 486 }
 487
 488 /* check SB1000 firmware CRC */
 489 static int
 490 sb1000_check_CRC(const int ioaddr[], const char* name)
 491 {
 492         static const unsigned char Command0[6] = {0x80, 0x1f, 0x00, 0x00, 0x00, 0x00};
 493
 494         unsigned char st[7];
 495         int crc, status;
 496
 497         /* check CRC */
 498         if ((status = card_send_command(ioaddr, name, Command0, st)))
 499                 return status;
 500         if (st[1] != st[3] || st[2] != st[4])
 501                 return -EIO;
 502         crc = st[1] << 8 | st[2];
 503         return 0;
 504 }
 505
 506 static inline int
 507 sb1000_start_get_set_command(const int ioaddr[], const char* name)
 508 {
 509         static const unsigned char Command0[6] = {0x80, 0x1b, 0x00, 0x00, 0x00, 0x00};
 510
 511         unsigned char st[7];
 512
 513         return card_send_command(ioaddr, name, Command0, st);
 514 }
 515
 516 static int
 517 sb1000_end_get_set_command(const int ioaddr[], const char* name)
 518 {
 519         static const unsigned char Command0[6] = {0x80, 0x1b, 0x02, 0x00, 0x00, 0x00};
 520         static const unsigned char Command1[6] = {0x20, 0x00, 0x00, 0x00, 0x00, 0x00};
 521
 522         unsigned char st[7];
 523         int status;
 524
 525         if ((status = card_send_command(ioaddr, name, Command0, st)))
 526                 return status;
 527         return card_send_command(ioaddr, name, Command1, st);
 528 }
 529
 530 static int
 531 sb1000_activate(const int ioaddr[], const char* name)
 532 {
 533         static const unsigned char Command0[6] = {0x80, 0x11, 0x00, 0x00, 0x00, 0x00};
 534         static const unsigned char Command1[6] = {0x80, 0x16, 0x00, 0x00, 0x00, 0x00};
 535
 536         unsigned char st[7];
 537         int status;
 538
 539         ssleep(1);
 540         if ((status = card_send_command(ioaddr, name, Command0, st)))
 541                 return status;
 542         if ((status = card_send_command(ioaddr, name, Command1, st)))
 543                 return status;
 544         if (st[3] != 0xf1) {
 545         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 546                         return status;
 547                 return -EIO;
 548         }
 549         udelay(1000);
 550     return sb1000_start_get_set_command(ioaddr, name);
 551 }
 552
 553 /* get SB1000 firmware version */
 554 static int
 555 sb1000_get_firmware_version(const int ioaddr[], const char* name,
 556         unsigned char version[], int do_end)
 557 {
 558         static const unsigned char Command0[6] = {0x80, 0x23, 0x00, 0x00, 0x00, 0x00};
 559
 560         unsigned char st[7];
 561         int status;
 562
 563         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 564                 return status;
 565         if ((status = card_send_command(ioaddr, name, Command0, st)))
 566                 return status;
 567         if (st[0] != 0xa3)
 568                 return -EIO;
 569         version[0] = st[1];
 570         version[1] = st[2];
 571         if (do_end)
 572                 return sb1000_end_get_set_command(ioaddr, name);
 573         else
 574                 return 0;
 575 }
 576
 577 /* get SB1000 frequency */
 578 static int
 579 sb1000_get_frequency(const int ioaddr[], const char* name, int* frequency)
 580 {
 581         static const unsigned char Command0[6] = {0x80, 0x44, 0x00, 0x00, 0x00, 0x00};
 582
 583         unsigned char st[7];
 584         int status;
 585
 586         udelay(1000);
 587         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 588                 return status;
 589         if ((status = card_send_command(ioaddr, name, Command0, st)))
 590                 return status;
 591         *frequency = ((st[1] << 8 | st[2]) << 8 | st[3]) << 8 | st[4];
 592         return sb1000_end_get_set_command(ioaddr, name);
 593 }
 594
 595 /* set SB1000 frequency */
 596 static int
 597 sb1000_set_frequency(const int ioaddr[], const char* name, int frequency)
 598 {
 599         unsigned char st[7];
 600         int status;
 601         unsigned char Command0[6] = {0x80, 0x29, 0x00, 0x00, 0x00, 0x00};
 602
 603         const int FrequencyLowerLimit = 57000;
 604         const int FrequencyUpperLimit = 804000;
 605
 606         if (frequency < FrequencyLowerLimit || frequency > FrequencyUpperLimit) {
 607                 printk(KERN_ERR "%s: frequency chosen (%d kHz) is not in the range "
 608                         "[%d,%d] kHz\n", name, frequency, FrequencyLowerLimit,
 609                         FrequencyUpperLimit);
 610                 return -EINVAL;
 611         }
 612         udelay(1000);
 613         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 614                 return status;
 615         Command0[5] = frequency & 0xff;
 616         frequency >>= 8;
 617         Command0[4] = frequency & 0xff;
 618         frequency >>= 8;
 619         Command0[3] = frequency & 0xff;
 620         frequency >>= 8;
 621         Command0[2] = frequency & 0xff;
 622         return card_send_command(ioaddr, name, Command0, st);
 623 }
 624
 625 /* get SB1000 PIDs */
 626 static int
 627 sb1000_get_PIDs(const int ioaddr[], const char* name, short PID[])
 628 {
 629         static const unsigned char Command0[6] = {0x80, 0x40, 0x00, 0x00, 0x00, 0x00};
 630         static const unsigned char Command1[6] = {0x80, 0x41, 0x00, 0x00, 0x00, 0x00};
 631         static const unsigned char Command2[6] = {0x80, 0x42, 0x00, 0x00, 0x00, 0x00};
 632         static const unsigned char Command3[6] = {0x80, 0x43, 0x00, 0x00, 0x00, 0x00};
 633
 634         unsigned char st[7];
 635         int status;
 636
 637         udelay(1000);
 638         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 639                 return status;
 640
 641         if ((status = card_send_command(ioaddr, name, Command0, st)))
 642                 return status;
 643         PID[0] = st[1] << 8 | st[2];
 644
 645         if ((status = card_send_command(ioaddr, name, Command1, st)))
 646                 return status;
 647         PID[1] = st[1] << 8 | st[2];
 648
 649         if ((status = card_send_command(ioaddr, name, Command2, st)))
 650                 return status;
 651         PID[2] = st[1] << 8 | st[2];
 652
 653         if ((status = card_send_command(ioaddr, name, Command3, st)))
 654                 return status;
 655         PID[3] = st[1] << 8 | st[2];
 656
 657         return sb1000_end_get_set_command(ioaddr, name);
 658 }
 659
 660 /* set SB1000 PIDs */
 661 static int
 662 sb1000_set_PIDs(const int ioaddr[], const char* name, const short PID[])
 663 {
 664         static const unsigned char Command4[6] = {0x80, 0x2e, 0x00, 0x00, 0x00, 0x00};
 665
 666         unsigned char st[7];
 667         short p;
 668         int status;
 669         unsigned char Command0[6] = {0x80, 0x31, 0x00, 0x00, 0x00, 0x00};
 670         unsigned char Command1[6] = {0x80, 0x32, 0x00, 0x00, 0x00, 0x00};
 671         unsigned char Command2[6] = {0x80, 0x33, 0x00, 0x00, 0x00, 0x00};
 672         unsigned char Command3[6] = {0x80, 0x34, 0x00, 0x00, 0x00, 0x00};
 673
 674         udelay(1000);
 675         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 676                 return status;
 677
 678         p = PID[0];
 679         Command0[3] = p & 0xff;
 680         p >>= 8;
 681         Command0[2] = p & 0xff;
 682         if ((status = card_send_command(ioaddr, name, Command0, st)))
 683                 return status;
 684
 685         p = PID[1];
 686         Command1[3] = p & 0xff;
 687         p >>= 8;
 688         Command1[2] = p & 0xff;
 689         if ((status = card_send_command(ioaddr, name, Command1, st)))
 690                 return status;
 691
 692         p = PID[2];
 693         Command2[3] = p & 0xff;
 694         p >>= 8;
 695         Command2[2] = p & 0xff;
 696         if ((status = card_send_command(ioaddr, name, Command2, st)))
 697                 return status;
 698
 699         p = PID[3];
 700         Command3[3] = p & 0xff;
 701         p >>= 8;
 702         Command3[2] = p & 0xff;
 703         if ((status = card_send_command(ioaddr, name, Command3, st)))
 704                 return status;
 705
 706         if ((status = card_send_command(ioaddr, name, Command4, st)))
 707                 return status;
 708         return sb1000_end_get_set_command(ioaddr, name);
 709 }
 710
 711
 712 static void
 713 sb1000_print_status_buffer(const char* name, unsigned char st[],
 714         unsigned char buffer[], int size)
 715 {
 716         int i, j, k;
 717
 718         printk(KERN_DEBUG "%s: status: %02x %02x\n", name, st[0], st[1]);
 719         if (buffer[24] == 0x08 && buffer[25] == 0x00 && buffer[26] == 0x45) {
 720                 printk(KERN_DEBUG "%s: length: %d protocol: %d from: %d.%d.%d.%d:%d "
 721                         "to %d.%d.%d.%d:%d\n", name, buffer[28] << 8 | buffer[29],
 722                         buffer[35], buffer[38], buffer[39], buffer[40], buffer[41],
 723             buffer[46] << 8 | buffer[47],
 724                         buffer[42], buffer[43], buffer[44], buffer[45],
 725             buffer[48] << 8 | buffer[49]);
 726         } else {
 727                 for (i = 0, k = 0; i < (size + 7) / 8; i++) {
 728                         printk(KERN_DEBUG "%s: %s", name, i ? "       " : "buffer:");
 729                         for (j = 0; j < 8 && k < size; j++, k++)
 730                                 printk(" %02x", buffer[k]);
 731                         printk("\n");
 732                 }
 733         }
 734         return;
 735 }
 736
 737 /*
 738  * SB1000 commands for frame rx interrupt
 739  */
 740 /* receive a single frame and assemble datagram
 741  * (this is the heart of the interrupt routine)
 742  */
 743 static int
 744 sb1000_rx(struct net_device *dev)
 745 {
 746
 747 #define FRAMESIZE 184
 748         unsigned char st[2], buffer[FRAMESIZE], session_id, frame_id;
 749         short dlen;
 750         int ioaddr, ns;
 751         unsigned int skbsize;
 752         struct sk_buff *skb;
 753         struct sb1000_private *lp = netdev_priv(dev);
 754         struct net_device_stats *stats = &dev->stats;
 755
 756         /* SB1000 frame constants */
 757         const int FrameSize = FRAMESIZE;
 758         const int NewDatagramHeaderSkip = 8;
 759         const int NewDatagramHeaderSize = NewDatagramHeaderSkip + 18;
 760         const int NewDatagramDataSize = FrameSize - NewDatagramHeaderSize;
 761         const int ContDatagramHeaderSkip = 7;
 762         const int ContDatagramHeaderSize = ContDatagramHeaderSkip + 1;
 763         const int ContDatagramDataSize = FrameSize - ContDatagramHeaderSize;
 764         const int TrailerSize = 4;
 765
 766         ioaddr = dev->base_addr;
 767
 768         insw(ioaddr, (unsigned short*) st, 1);
 769 #ifdef XXXDEBUG
 770 printk("cm0: received: %02x %02x\n", st[0], st[1]);
 771 #endif /* XXXDEBUG */
 772         lp->rx_frames++;
 773
 774         /* decide if it is a good or bad frame */
 775         for (ns = 0; ns < NPIDS; ns++) {
 776                 session_id = lp->rx_session_id[ns];
 777                 frame_id = lp->rx_frame_id[ns];
 778                 if (st[0] == session_id) {
 779                         if (st[1] == frame_id || (!frame_id && (st[1] & 0xf0) == 0x30)) {
 780                                 goto good_frame;
 781                         } else if ((st[1] & 0xf0) == 0x30 && (st[0] & 0x40)) {
 782                                 goto skipped_frame;
 783                         } else {
 784                                 goto bad_frame;
 785                         }
 786                 } else if (st[0] == (session_id | 0x40)) {
 787                         if ((st[1] & 0xf0) == 0x30) {
 788                                 goto skipped_frame;
 789                         } else {
 790                                 goto bad_frame;
 791                         }
 792                 }
 793         }
 794         goto bad_frame;
 795
 796 skipped_frame:
 797         stats->rx_frame_errors++;
 798         skb = lp->rx_skb[ns];
 799         if (sb1000_debug > 1)
 800                 printk(KERN_WARNING "%s: missing frame(s): got %02x %02x "
 801                         "expecting %02x %02x\n", dev->name, st[0], st[1],
 802                         skb ? session_id : session_id | 0x40, frame_id);
 803         if (skb) {
 804                 dev_kfree_skb(skb);
 805                 skb = NULL;
 806         }
 807
 808 good_frame:
 809         lp->rx_frame_id[ns] = 0x30 | ((st[1] + 1) & 0x0f);
 810         /* new datagram */
 811         if (st[0] & 0x40) {
 812                 /* get data length */
 813                 insw(ioaddr, buffer, NewDatagramHeaderSize / 2);
 814 #ifdef XXXDEBUG
 815 printk("cm0: IP identification: %02x%02x  fragment offset: %02x%02x\n", buffer[30], buffer[31], buffer[32], buffer[33]);
 816 #endif /* XXXDEBUG */
 817                 if (buffer[0] != NewDatagramHeaderSkip) {
 818                         if (sb1000_debug > 1)
 819                                 printk(KERN_WARNING "%s: new datagram header skip error: "
 820                                         "got %02x expecting %02x\n", dev->name, buffer[0],
 821                                         NewDatagramHeaderSkip);
 822                         stats->rx_length_errors++;
 823                         insw(ioaddr, buffer, NewDatagramDataSize / 2);
 824                         goto bad_frame_next;
 825                 }
 826                 dlen = ((buffer[NewDatagramHeaderSkip + 3] & 0x0f) << 8 |
 827                         buffer[NewDatagramHeaderSkip + 4]) - 17;
 828                 if (dlen > SB1000_MRU) {
 829                         if (sb1000_debug > 1)
 830                                 printk(KERN_WARNING "%s: datagram length (%d) greater "
 831                                         "than MRU (%d)\n", dev->name, dlen, SB1000_MRU);
 832                         stats->rx_length_errors++;
 833                         insw(ioaddr, buffer, NewDatagramDataSize / 2);
 834                         goto bad_frame_next;
 835                 }
 836                 lp->rx_dlen[ns] = dlen;
 837                 /* compute size to allocate for datagram */
 838                 skbsize = dlen + FrameSize;
 839                 if ((skb = alloc_skb(skbsize, GFP_ATOMIC)) == NULL) {
 840                         if (sb1000_debug > 1)
 841                                 printk(KERN_WARNING "%s: can't allocate %d bytes long "
 842                                         "skbuff\n", dev->name, skbsize);
 843                         stats->rx_dropped++;
 844                         insw(ioaddr, buffer, NewDatagramDataSize / 2);
 845                         goto dropped_frame;
 846                 }
 847                 skb->dev = dev;
 848                 skb_reset_mac_header(skb);
 849                 skb->protocol = (unsigned short) buffer[NewDatagramHeaderSkip + 16];
 850                 insw(ioaddr, skb_put(skb, NewDatagramDataSize),
 851                         NewDatagramDataSize / 2);
 852                 lp->rx_skb[ns] = skb;
 853         } else {
 854                 /* continuation of previous datagram */
 855                 insw(ioaddr, buffer, ContDatagramHeaderSize / 2);
 856                 if (buffer[0] != ContDatagramHeaderSkip) {
 857                         if (sb1000_debug > 1)
 858                                 printk(KERN_WARNING "%s: cont datagram header skip error: "
 859                                         "got %02x expecting %02x\n", dev->name, buffer[0],
 860                                         ContDatagramHeaderSkip);
 861                         stats->rx_length_errors++;
 862                         insw(ioaddr, buffer, ContDatagramDataSize / 2);
 863                         goto bad_frame_next;
 864                 }
 865                 skb = lp->rx_skb[ns];
 866                 insw(ioaddr, skb_put(skb, ContDatagramDataSize),
 867                         ContDatagramDataSize / 2);
 868                 dlen = lp->rx_dlen[ns];
 869         }
 870         if (skb->len < dlen + TrailerSize) {
 871                 lp->rx_session_id[ns] &= ~0x40;
 872                 return 0;
 873         }
 874
 875         /* datagram completed: send to upper level */
 876         skb_trim(skb, dlen);
 877         netif_rx(skb);
 878         stats->rx_bytes+=dlen;
 879         stats->rx_packets++;
 880         lp->rx_skb[ns] = NULL;
 881         lp->rx_session_id[ns] |= 0x40;
 882         return 0;
 883
 884 bad_frame:
 885         insw(ioaddr, buffer, FrameSize / 2);
 886         if (sb1000_debug > 1)
 887                 printk(KERN_WARNING "%s: frame error: got %02x %02x\n",
 888                         dev->name, st[0], st[1]);
 889         stats->rx_frame_errors++;
 890 bad_frame_next:
 891         if (sb1000_debug > 2)
 892                 sb1000_print_status_buffer(dev->name, st, buffer, FrameSize);
 893 dropped_frame:
 894         stats->rx_errors++;
 895         if (ns < NPIDS) {
 896                 if ((skb = lp->rx_skb[ns])) {
 897                         dev_kfree_skb(skb);
 898                         lp->rx_skb[ns] = NULL;
 899                 }
 900                 lp->rx_session_id[ns] |= 0x40;
 901         }
 902         return -1;
 903 }
 904
 905 static void
 906 sb1000_error_dpc(struct net_device *dev)
 907 {
 908         static const unsigned char Command0[6] = {0x80, 0x26, 0x00, 0x00, 0x00, 0x00};
 909
 910         char *name;
 911         unsigned char st[5];
 912         int ioaddr[2];
 913         struct sb1000_private *lp = netdev_priv(dev);
 914         const int ErrorDpcCounterInitialize = 200;
 915
 916         ioaddr[0] = dev->base_addr;
 917         /* mem_start holds the second I/O address */
 918         ioaddr[1] = dev->mem_start;
 919         name = dev->name;
 920
 921         sb1000_wait_for_ready_clear(ioaddr, name);
 922         sb1000_send_command(ioaddr, name, Command0);
 923         sb1000_wait_for_ready(ioaddr, name);
 924         sb1000_read_status(ioaddr, st);
 925         if (st[1] & 0x10)
 926                 lp->rx_error_dpc_count = ErrorDpcCounterInitialize;
 927         return;
 928 }
 929
 930
 931 /*
 932  * Linux interface functions
 933  */
 934 static int
 935 sb1000_open(struct net_device *dev)
 936 {
 937         char *name;
 938         int ioaddr[2], status;
 939         struct sb1000_private *lp = netdev_priv(dev);
 940         const unsigned short FirmwareVersion[] = {0x01, 0x01};
 941
 942         ioaddr[0] = dev->base_addr;
 943         /* mem_start holds the second I/O address */
 944         ioaddr[1] = dev->mem_start;
 945         name = dev->name;
 946
 947         /* initialize sb1000 */
 948         if ((status = sb1000_reset(ioaddr, name)))
 949                 return status;
 950         ssleep(1);
 951         if ((status = sb1000_check_CRC(ioaddr, name)))
 952                 return status;
 953
 954         /* initialize private data before board can catch interrupts */
 955         lp->rx_skb[0] = NULL;
 956         lp->rx_skb[1] = NULL;
 957         lp->rx_skb[2] = NULL;
 958         lp->rx_skb[3] = NULL;
 959         lp->rx_dlen[0] = 0;
 960         lp->rx_dlen[1] = 0;
 961         lp->rx_dlen[2] = 0;
 962         lp->rx_dlen[3] = 0;
 963         lp->rx_frames = 0;
 964         lp->rx_error_count = 0;
 965         lp->rx_error_dpc_count = 0;
 966         lp->rx_session_id[0] = 0x50;
 967         lp->rx_session_id[0] = 0x48;
 968         lp->rx_session_id[0] = 0x44;
 969         lp->rx_session_id[0] = 0x42;
 970         lp->rx_frame_id[0] = 0;
 971         lp->rx_frame_id[1] = 0;
 972         lp->rx_frame_id[2] = 0;
 973         lp->rx_frame_id[3] = 0;
 974         if (request_irq(dev->irq, &sb1000_interrupt, 0, "sb1000", dev)) {
 975                 return -EAGAIN;
 976         }
 977
 978         if (sb1000_debug > 2)
 979                 printk(KERN_DEBUG "%s: Opening, IRQ %d\n", name, dev->irq);
 980
 981         /* Activate board and check firmware version */
 982         udelay(1000);
 983         if ((status = sb1000_activate(ioaddr, name)))
 984                 return status;
 985         udelay(0);
 986         if ((status = sb1000_get_firmware_version(ioaddr, name, version, 0)))
 987                 return status;
 988         if (version[0] != FirmwareVersion[0] || version[1] != FirmwareVersion[1])
 989                 printk(KERN_WARNING "%s: found firmware version %x.%02x "
 990                         "(should be %x.%02x)\n", name, version[0], version[1],
 991                         FirmwareVersion[0], FirmwareVersion[1]);
 992
 993
 994         netif_start_queue(dev);
 995         return 0;                                       /* Always succeed */
 996 }
 997
 998 static int sb1000_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 999 {
1000         char* name;
1001         unsigned char version[2];
1002         short PID[4];
1003         int ioaddr[2], status, frequency;
1004         unsigned int stats[5];
1005         struct sb1000_private *lp = netdev_priv(dev);
1006
1007         if (!(dev && dev->flags & IFF_UP))
1008                 return -ENODEV;
1009
1010         ioaddr[0] = dev->base_addr;
1011         /* mem_start holds the second I/O address */
1012         ioaddr[1] = dev->mem_start;
1013         name = dev->name;
1014
1015         switch (cmd) {
1016         case SIOCGCMSTATS:              /* get statistics */
1017                 stats[0] = dev->stats.rx_bytes;
1018                 stats[1] = lp->rx_frames;
1019                 stats[2] = dev->stats.rx_packets;
1020                 stats[3] = dev->stats.rx_errors;
1021                 stats[4] = dev->stats.rx_dropped;
1022                 if(copy_to_user(ifr->ifr_data, stats, sizeof(stats)))
1023                         return -EFAULT;
1024                 status = 0;
1025                 break;
1026
1027         case SIOCGCMFIRMWARE:           /* get firmware version */
1028                 if ((status = sb1000_get_firmware_version(ioaddr, name, version, 1)))
1029                         return status;
1030                 if(copy_to_user(ifr->ifr_data, version, sizeof(version)))
1031                         return -EFAULT;
1032                 break;
1033
1034         case SIOCGCMFREQUENCY:          /* get frequency */
1035                 if ((status = sb1000_get_frequency(ioaddr, name, &frequency)))
1036                         return status;
1037                 if(put_user(frequency, (int __user *) ifr->ifr_data))
1038                         return -EFAULT;
1039                 break;
1040
1041         case SIOCSCMFREQUENCY:          /* set frequency */
1042                 if (!capable(CAP_NET_ADMIN))
1043                         return -EPERM;
1044                 if(get_user(frequency, (int __user *) ifr->ifr_data))
1045                         return -EFAULT;
1046                 if ((status = sb1000_set_frequency(ioaddr, name, frequency)))
1047                         return status;
1048                 break;
1049
1050         case SIOCGCMPIDS:                       /* get PIDs */
1051                 if ((status = sb1000_get_PIDs(ioaddr, name, PID)))
1052                         return status;
1053                 if(copy_to_user(ifr->ifr_data, PID, sizeof(PID)))
1054                         return -EFAULT;
1055                 break;
1056
1057         case SIOCSCMPIDS:                       /* set PIDs */
1058                 if (!capable(CAP_NET_ADMIN))
1059                         return -EPERM;
1060                 if(copy_from_user(PID, ifr->ifr_data, sizeof(PID)))
1061                         return -EFAULT;
1062                 if ((status = sb1000_set_PIDs(ioaddr, name, PID)))
1063                         return status;
1064                 /* set session_id, frame_id and pkt_type too */
1065                 lp->rx_session_id[0] = 0x50 | (PID[0] & 0x0f);
1066                 lp->rx_session_id[1] = 0x48;
1067                 lp->rx_session_id[2] = 0x44;
1068                 lp->rx_session_id[3] = 0x42;
1069                 lp->rx_frame_id[0] = 0;
1070                 lp->rx_frame_id[1] = 0;
1071                 lp->rx_frame_id[2] = 0;
1072                 lp->rx_frame_id[3] = 0;
1073                 break;
1074
1075         default:
1076                 status = -EINVAL;
1077                 break;
1078         }
1079         return status;
1080 }
1081
1082 /* transmit function: do nothing since SB1000 can't send anything out */
1083 static int
1084 sb1000_start_xmit(struct sk_buff *skb, struct net_device *dev)
1085 {
1086         printk(KERN_WARNING "%s: trying to transmit!!!\n", dev->name);
1087         /* sb1000 can't xmit datagrams */
1088         dev_kfree_skb(skb);
1089         return 0;
1090 }
1091
1092 /* SB1000 interrupt handler. */
1093 static irqreturn_t sb1000_interrupt(int irq, void *dev_id)
1094 {
1095         static const unsigned char Command0[6] = {0x80, 0x2c, 0x00, 0x00, 0x00, 0x00};
1096         static const unsigned char Command1[6] = {0x80, 0x2e, 0x00, 0x00, 0x00, 0x00};
1097
1098         char *name;
1099         unsigned char st;
1100         int ioaddr[2];
1101         struct net_device *dev = dev_id;
1102         struct sb1000_private *lp = netdev_priv(dev);
1103
1104         const int MaxRxErrorCount = 6;
1105
1106         ioaddr[0] = dev->base_addr;
1107         /* mem_start holds the second I/O address */
1108         ioaddr[1] = dev->mem_start;
1109         name = dev->name;
1110
1111         /* is it a good interrupt? */
1112         st = inb(ioaddr[1] + 6);
1113         if (!(st & 0x08 && st & 0x20)) {
1114                 return IRQ_NONE;
1115         }
1116
1117         if (sb1000_debug > 3)
1118                 printk(KERN_DEBUG "%s: entering interrupt\n", dev->name);
1119
1120         st = inb(ioaddr[0] + 7);
1121         if (sb1000_rx(dev))
1122                 lp->rx_error_count++;
1123 #ifdef SB1000_DELAY
1124         udelay(SB1000_DELAY);
1125 #endif /* SB1000_DELAY */
1126         sb1000_issue_read_command(ioaddr, name);
1127         if (st & 0x01) {
1128                 sb1000_error_dpc(dev);
1129                 sb1000_issue_read_command(ioaddr, name);
1130         }
1131         if (lp->rx_error_dpc_count && !(--lp->rx_error_dpc_count)) {
1132                 sb1000_wait_for_ready_clear(ioaddr, name);
1133                 sb1000_send_command(ioaddr, name, Command0);
1134                 sb1000_wait_for_ready(ioaddr, name);
1135                 sb1000_issue_read_command(ioaddr, name);
1136         }
1137         if (lp->rx_error_count >= MaxRxErrorCount) {
1138                 sb1000_wait_for_ready_clear(ioaddr, name);
1139                 sb1000_send_command(ioaddr, name, Command1);
1140                 sb1000_wait_for_ready(ioaddr, name);
1141                 sb1000_issue_read_command(ioaddr, name);
1142                 lp->rx_error_count = 0;
1143         }
1144
1145         return IRQ_HANDLED;
1146 }
1147
1148 static int sb1000_close(struct net_device *dev)
1149 {
1150         int i;
1151         int ioaddr[2];
1152         struct sb1000_private *lp = netdev_priv(dev);
1153
1154         if (sb1000_debug > 2)
1155                 printk(KERN_DEBUG "%s: Shutting down sb1000.\n", dev->name);
1156
1157         netif_stop_queue(dev);
1158
1159         ioaddr[0] = dev->base_addr;
1160         /* mem_start holds the second I/O address */
1161         ioaddr[1] = dev->mem_start;
1162
1163         free_irq(dev->irq, dev);
1164         /* If we don't do this, we can't re-insmod it later. */
1165         release_region(ioaddr[1], SB1000_IO_EXTENT);
1166         release_region(ioaddr[0], SB1000_IO_EXTENT);
1167
1168         /* free rx_skb's if needed */
1169         for (i=0; i<4; i++) {
1170                 if (lp->rx_skb[i]) {
1171                         dev_kfree_skb(lp->rx_skb[i]);
1172                 }
1173         }
1174         return 0;
1175 }
1176
1177 MODULE_AUTHOR("Franco Venturi <fventuri@mediaone.net>");
1178 MODULE_DESCRIPTION("General Instruments SB1000 driver");
1179 MODULE_LICENSE("GPL");
1180
1181 static int __init
1182 sb1000_init(void)
1183 {
1184         return pnp_register_driver(&sb1000_driver);
1185 }
1186
1187 static void __exit
1188 sb1000_exit(void)
1189 {
1190         pnp_unregister_driver(&sb1000_driver);
1191 }
1192
1193 module_init(sb1000_init);
1194 module_exit(sb1000_exit);