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/sched.h>
  40 #include <linux/string.h>
  41 #include <linux/interrupt.h>
  42 #include <linux/errno.h>
  43 #include <linux/if_cablemodem.h> /* for SIOGCM/SIOSCM stuff */
  44 #include <linux/in.h>
  45 #include <linux/slab.h>
  46 #include <linux/ioport.h>
  47 #include <linux/netdevice.h>
  48 #include <linux/if_arp.h>
  49 #include <linux/skbuff.h>
  50 #include <linux/delay.h>        /* for udelay() */
  51 #include <linux/etherdevice.h>
  52 #include <linux/pnp.h>
  53 #include <linux/init.h>
  54 #include <linux/bitops.h>
  55
  56 #include <asm/io.h>
  57 #include <asm/processor.h>
  58 #include <asm/uaccess.h>
  59
  60 #ifdef SB1000_DEBUG
  61 static int sb1000_debug = SB1000_DEBUG;
  62 #else
  63 static const int sb1000_debug = 1;
  64 #endif
  65
  66 static const int SB1000_IO_EXTENT = 8;
  67 /* SB1000 Maximum Receive Unit */
  68 static const int SB1000_MRU = 1500; /* octects */
  69
  70 #define NPIDS 4
  71 struct sb1000_private {
  72         struct sk_buff *rx_skb[NPIDS];
  73         short rx_dlen[NPIDS];
  74         unsigned int rx_frames;
  75         short rx_error_count;
  76         short rx_error_dpc_count;
  77         unsigned char rx_session_id[NPIDS];
  78         unsigned char rx_frame_id[NPIDS];
  79         unsigned char rx_pkt_type[NPIDS];
  80 };
  81
  82 /* prototypes for Linux interface */
  83 extern int sb1000_probe(struct net_device *dev);
  84 static int sb1000_open(struct net_device *dev);
  85 static int sb1000_dev_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd);
  86 static netdev_tx_t sb1000_start_xmit(struct sk_buff *skb,
  87                                      struct net_device *dev);
  88 static irqreturn_t sb1000_interrupt(int irq, void *dev_id);
  89 static int sb1000_close(struct net_device *dev);
  90
  91
  92 /* SB1000 hardware routines to be used during open/configuration phases */
  93 static int card_wait_for_busy_clear(const int ioaddr[],
  94         const char* name);
  95 static int card_wait_for_ready(const int ioaddr[], const char* name,
  96         unsigned char in[]);
  97 static int card_send_command(const int ioaddr[], const char* name,
  98         const unsigned char out[], unsigned char in[]);
  99
 100 /* SB1000 hardware routines to be used during frame rx interrupt */
 101 static int sb1000_wait_for_ready(const int ioaddr[], const char* name);
 102 static int sb1000_wait_for_ready_clear(const int ioaddr[],
 103         const char* name);
 104 static void sb1000_send_command(const int ioaddr[], const char* name,
 105         const unsigned char out[]);
 106 static void sb1000_read_status(const int ioaddr[], unsigned char in[]);
 107 static void sb1000_issue_read_command(const int ioaddr[],
 108         const char* name);
 109
 110 /* SB1000 commands for open/configuration */
 111 static int sb1000_reset(const int ioaddr[], const char* name);
 112 static int sb1000_check_CRC(const int ioaddr[], const char* name);
 113 static inline int sb1000_start_get_set_command(const int ioaddr[],
 114         const char* name);
 115 static int sb1000_end_get_set_command(const int ioaddr[],
 116         const char* name);
 117 static int sb1000_activate(const int ioaddr[], const char* name);
 118 static int sb1000_get_firmware_version(const int ioaddr[],
 119         const char* name, unsigned char version[], int do_end);
 120 static int sb1000_get_frequency(const int ioaddr[], const char* name,
 121         int* frequency);
 122 static int sb1000_set_frequency(const int ioaddr[], const char* name,
 123         int frequency);
 124 static int sb1000_get_PIDs(const int ioaddr[], const char* name,
 125         short PID[]);
 126 static int sb1000_set_PIDs(const int ioaddr[], const char* name,
 127         const short PID[]);
 128
 129 /* SB1000 commands for frame rx interrupt */
 130 static int sb1000_rx(struct net_device *dev);
 131 static void sb1000_error_dpc(struct net_device *dev);
 132
 133 static const struct pnp_device_id sb1000_pnp_ids[] = {
 134         { "GIC1000", 0 },
 135         { "", 0 }
 136 };
 137 MODULE_DEVICE_TABLE(pnp, sb1000_pnp_ids);
 138
 139 static const struct net_device_ops sb1000_netdev_ops = {
 140         .ndo_open               = sb1000_open,
 141         .ndo_start_xmit         = sb1000_start_xmit,
 142         .ndo_do_ioctl           = sb1000_dev_ioctl,
 143         .ndo_stop               = sb1000_close,
 144         .ndo_change_mtu         = eth_change_mtu,
 145         .ndo_set_mac_address    = eth_mac_addr,
 146         .ndo_validate_addr      = eth_validate_addr,
 147 };
 148
 149 static int
 150 sb1000_probe_one(struct pnp_dev *pdev, const struct pnp_device_id *id)
 151 {
 152         struct net_device *dev;
 153         unsigned short ioaddr[2], irq;
 154         unsigned int serial_number;
 155         int error = -ENODEV;
 156
 157         if (pnp_device_attach(pdev) < 0)
 158                 return -ENODEV;
 159         if (pnp_activate_dev(pdev) < 0)
 160                 goto out_detach;
 161
 162         if (!pnp_port_valid(pdev, 0) || !pnp_port_valid(pdev, 1))
 163                 goto out_disable;
 164         if (!pnp_irq_valid(pdev, 0))
 165                 goto out_disable;
 166
 167         serial_number = pdev->card->serial;
 168
 169         ioaddr[0] = pnp_port_start(pdev, 0);
 170         ioaddr[1] = pnp_port_start(pdev, 0);
 171
 172         irq = pnp_irq(pdev, 0);
 173
 174         if (!request_region(ioaddr[0], 16, "sb1000"))
 175                 goto out_disable;
 176         if (!request_region(ioaddr[1], 16, "sb1000"))
 177                 goto out_release_region0;
 178
 179         dev = alloc_etherdev(sizeof(struct sb1000_private));
 180         if (!dev) {
 181                 error = -ENOMEM;
 182                 goto out_release_regions;
 183         }
 184
 185
 186         dev->base_addr = ioaddr[0];
 187         /* mem_start holds the second I/O address */
 188         dev->mem_start = ioaddr[1];
 189         dev->irq = irq;
 190
 191         if (sb1000_debug > 0)
 192                 printk(KERN_NOTICE "%s: sb1000 at (%#3.3lx,%#3.3lx), "
 193                         "S/N %#8.8x, IRQ %d.\n", dev->name, dev->base_addr,
 194                         dev->mem_start, serial_number, dev->irq);
 195
 196         /*
 197          * The SB1000 is an rx-only cable modem device.  The uplink is a modem
 198          * and we do not want to arp on it.
 199          */
 200         dev->flags = IFF_POINTOPOINT|IFF_NOARP;
 201
 202         SET_NETDEV_DEV(dev, &pdev->dev);
 203
 204         if (sb1000_debug > 0)
 205                 printk(KERN_NOTICE "%s", version);
 206
 207         dev->netdev_ops = &sb1000_netdev_ops;
 208
 209         /* hardware address is 0:0:serial_number */
 210         dev->dev_addr[2]        = serial_number >> 24 & 0xff;
 211         dev->dev_addr[3]        = serial_number >> 16 & 0xff;
 212         dev->dev_addr[4]        = serial_number >>  8 & 0xff;
 213         dev->dev_addr[5]        = serial_number >>  0 & 0xff;
 214
 215         pnp_set_drvdata(pdev, dev);
 216
 217         error = register_netdev(dev);
 218         if (error)
 219                 goto out_free_netdev;
 220         return 0;
 221
 222  out_free_netdev:
 223         free_netdev(dev);
 224  out_release_regions:
 225         release_region(ioaddr[1], 16);
 226  out_release_region0:
 227         release_region(ioaddr[0], 16);
 228  out_disable:
 229         pnp_disable_dev(pdev);
 230  out_detach:
 231         pnp_device_detach(pdev);
 232         return error;
 233 }
 234
 235 static void
 236 sb1000_remove_one(struct pnp_dev *pdev)
 237 {
 238         struct net_device *dev = pnp_get_drvdata(pdev);
 239
 240         unregister_netdev(dev);
 241         release_region(dev->base_addr, 16);
 242         release_region(dev->mem_start, 16);
 243         free_netdev(dev);
 244 }
 245
 246 static struct pnp_driver sb1000_driver = {
 247         .name           = "sb1000",
 248         .id_table       = sb1000_pnp_ids,
 249         .probe          = sb1000_probe_one,
 250         .remove         = sb1000_remove_one,
 251 };
 252
 253
 254 /*
 255  * SB1000 hardware routines to be used during open/configuration phases
 256  */
 257
 258 static const int TimeOutJiffies = (875 * HZ) / 100;
 259
 260 /* Card Wait For Busy Clear (cannot be used during an interrupt) */
 261 static int
 262 card_wait_for_busy_clear(const int ioaddr[], const char* name)
 263 {
 264         unsigned char a;
 265         unsigned long timeout;
 266
 267         a = inb(ioaddr[0] + 7);
 268         timeout = jiffies + TimeOutJiffies;
 269         while (a & 0x80 || a & 0x40) {
 270                 /* a little sleep */
 271                 yield();
 272
 273                 a = inb(ioaddr[0] + 7);
 274                 if (time_after_eq(jiffies, timeout)) {
 275                         printk(KERN_WARNING "%s: card_wait_for_busy_clear timeout\n",
 276                                 name);
 277                         return -ETIME;
 278                 }
 279         }
 280
 281         return 0;
 282 }
 283
 284 /* Card Wait For Ready (cannot be used during an interrupt) */
 285 static int
 286 card_wait_for_ready(const int ioaddr[], const char* name, unsigned char in[])
 287 {
 288         unsigned char a;
 289         unsigned long timeout;
 290
 291         a = inb(ioaddr[1] + 6);
 292         timeout = jiffies + TimeOutJiffies;
 293         while (a & 0x80 || !(a & 0x40)) {
 294                 /* a little sleep */
 295                 yield();
 296
 297                 a = inb(ioaddr[1] + 6);
 298                 if (time_after_eq(jiffies, timeout)) {
 299                         printk(KERN_WARNING "%s: card_wait_for_ready timeout\n",
 300                                 name);
 301                         return -ETIME;
 302                 }
 303         }
 304
 305         in[1] = inb(ioaddr[0] + 1);
 306         in[2] = inb(ioaddr[0] + 2);
 307         in[3] = inb(ioaddr[0] + 3);
 308         in[4] = inb(ioaddr[0] + 4);
 309         in[0] = inb(ioaddr[0] + 5);
 310         in[6] = inb(ioaddr[0] + 6);
 311         in[5] = inb(ioaddr[1] + 6);
 312         return 0;
 313 }
 314
 315 /* Card Send Command (cannot be used during an interrupt) */
 316 static int
 317 card_send_command(const int ioaddr[], const char* name,
 318         const unsigned char out[], unsigned char in[])
 319 {
 320         int status, x;
 321
 322         if ((status = card_wait_for_busy_clear(ioaddr, name)))
 323                 return status;
 324         outb(0xa0, ioaddr[0] + 6);
 325         outb(out[2], ioaddr[0] + 1);
 326         outb(out[3], ioaddr[0] + 2);
 327         outb(out[4], ioaddr[0] + 3);
 328         outb(out[5], ioaddr[0] + 4);
 329         outb(out[1], ioaddr[0] + 5);
 330         outb(0xa0, ioaddr[0] + 6);
 331         outb(out[0], ioaddr[0] + 7);
 332         if (out[0] != 0x20 && out[0] != 0x30) {
 333                 if ((status = card_wait_for_ready(ioaddr, name, in)))
 334                         return status;
 335                 inb(ioaddr[0] + 7);
 336                 if (sb1000_debug > 3)
 337                         printk(KERN_DEBUG "%s: card_send_command "
 338                                 "out: %02x%02x%02x%02x%02x%02x  "
 339                                 "in: %02x%02x%02x%02x%02x%02x%02x\n", name,
 340                                 out[0], out[1], out[2], out[3], out[4], out[5],
 341                                 in[0], in[1], in[2], in[3], in[4], in[5], in[6]);
 342         } else {
 343                 if (sb1000_debug > 3)
 344                         printk(KERN_DEBUG "%s: card_send_command "
 345                                 "out: %02x%02x%02x%02x%02x%02x\n", name,
 346                                 out[0], out[1], out[2], out[3], out[4], out[5]);
 347         }
 348
 349         if (out[1] == 0x1b) {
 350                 x = (out[2] == 0x02);
 351         } else {
 352                 if (out[0] >= 0x80 && in[0] != (out[1] | 0x80))
 353                         return -EIO;
 354         }
 355         return 0;
 356 }
 357
 358
 359 /*
 360  * SB1000 hardware routines to be used during frame rx interrupt
 361  */
 362 static const int Sb1000TimeOutJiffies = 7 * HZ;
 363
 364 /* Card Wait For Ready (to be used during frame rx) */
 365 static int
 366 sb1000_wait_for_ready(const int ioaddr[], const char* name)
 367 {
 368         unsigned long timeout;
 369
 370         timeout = jiffies + Sb1000TimeOutJiffies;
 371         while (inb(ioaddr[1] + 6) & 0x80) {
 372                 if (time_after_eq(jiffies, timeout)) {
 373                         printk(KERN_WARNING "%s: sb1000_wait_for_ready timeout\n",
 374                                 name);
 375                         return -ETIME;
 376                 }
 377         }
 378         timeout = jiffies + Sb1000TimeOutJiffies;
 379         while (!(inb(ioaddr[1] + 6) & 0x40)) {
 380                 if (time_after_eq(jiffies, timeout)) {
 381                         printk(KERN_WARNING "%s: sb1000_wait_for_ready timeout\n",
 382                                 name);
 383                         return -ETIME;
 384                 }
 385         }
 386         inb(ioaddr[0] + 7);
 387         return 0;
 388 }
 389
 390 /* Card Wait For Ready Clear (to be used during frame rx) */
 391 static int
 392 sb1000_wait_for_ready_clear(const int ioaddr[], const char* name)
 393 {
 394         unsigned long timeout;
 395
 396         timeout = jiffies + Sb1000TimeOutJiffies;
 397         while (inb(ioaddr[1] + 6) & 0x80) {
 398                 if (time_after_eq(jiffies, timeout)) {
 399                         printk(KERN_WARNING "%s: sb1000_wait_for_ready_clear timeout\n",
 400                                 name);
 401                         return -ETIME;
 402                 }
 403         }
 404         timeout = jiffies + Sb1000TimeOutJiffies;
 405         while (inb(ioaddr[1] + 6) & 0x40) {
 406                 if (time_after_eq(jiffies, timeout)) {
 407                         printk(KERN_WARNING "%s: sb1000_wait_for_ready_clear timeout\n",
 408                                 name);
 409                         return -ETIME;
 410                 }
 411         }
 412         return 0;
 413 }
 414
 415 /* Card Send Command (to be used during frame rx) */
 416 static void
 417 sb1000_send_command(const int ioaddr[], const char* name,
 418         const unsigned char out[])
 419 {
 420         outb(out[2], ioaddr[0] + 1);
 421         outb(out[3], ioaddr[0] + 2);
 422         outb(out[4], ioaddr[0] + 3);
 423         outb(out[5], ioaddr[0] + 4);
 424         outb(out[1], ioaddr[0] + 5);
 425         outb(out[0], ioaddr[0] + 7);
 426         if (sb1000_debug > 3)
 427                 printk(KERN_DEBUG "%s: sb1000_send_command out: %02x%02x%02x%02x"
 428                         "%02x%02x\n", name, out[0], out[1], out[2], out[3], out[4], out[5]);
 429         return;
 430 }
 431
 432 /* Card Read Status (to be used during frame rx) */
 433 static void
 434 sb1000_read_status(const int ioaddr[], unsigned char in[])
 435 {
 436         in[1] = inb(ioaddr[0] + 1);
 437         in[2] = inb(ioaddr[0] + 2);
 438         in[3] = inb(ioaddr[0] + 3);
 439         in[4] = inb(ioaddr[0] + 4);
 440         in[0] = inb(ioaddr[0] + 5);
 441         return;
 442 }
 443
 444 /* Issue Read Command (to be used during frame rx) */
 445 static void
 446 sb1000_issue_read_command(const int ioaddr[], const char* name)
 447 {
 448         static const unsigned char Command0[6] = {0x20, 0x00, 0x00, 0x01, 0x00, 0x00};
 449
 450         sb1000_wait_for_ready_clear(ioaddr, name);
 451         outb(0xa0, ioaddr[0] + 6);
 452         sb1000_send_command(ioaddr, name, Command0);
 453         return;
 454 }
 455
 456
 457 /*
 458  * SB1000 commands for open/configuration
 459  */
 460 /* reset SB1000 card */
 461 static int
 462 sb1000_reset(const int ioaddr[], const char* name)
 463 {
 464         static const unsigned char Command0[6] = {0x80, 0x16, 0x00, 0x00, 0x00, 0x00};
 465
 466         unsigned char st[7];
 467         int port, status;
 468
 469         port = ioaddr[1] + 6;
 470         outb(0x4, port);
 471         inb(port);
 472         udelay(1000);
 473         outb(0x0, port);
 474         inb(port);
 475         ssleep(1);
 476         outb(0x4, port);
 477         inb(port);
 478         udelay(1000);
 479         outb(0x0, port);
 480         inb(port);
 481         udelay(0);
 482
 483         if ((status = card_send_command(ioaddr, name, Command0, st)))
 484                 return status;
 485         if (st[3] != 0xf0)
 486                 return -EIO;
 487         return 0;
 488 }
 489
 490 /* check SB1000 firmware CRC */
 491 static int
 492 sb1000_check_CRC(const int ioaddr[], const char* name)
 493 {
 494         static const unsigned char Command0[6] = {0x80, 0x1f, 0x00, 0x00, 0x00, 0x00};
 495
 496         unsigned char st[7];
 497         int crc, status;
 498
 499         /* check CRC */
 500         if ((status = card_send_command(ioaddr, name, Command0, st)))
 501                 return status;
 502         if (st[1] != st[3] || st[2] != st[4])
 503                 return -EIO;
 504         crc = st[1] << 8 | st[2];
 505         return 0;
 506 }
 507
 508 static inline int
 509 sb1000_start_get_set_command(const int ioaddr[], const char* name)
 510 {
 511         static const unsigned char Command0[6] = {0x80, 0x1b, 0x00, 0x00, 0x00, 0x00};
 512
 513         unsigned char st[7];
 514
 515         return card_send_command(ioaddr, name, Command0, st);
 516 }
 517
 518 static int
 519 sb1000_end_get_set_command(const int ioaddr[], const char* name)
 520 {
 521         static const unsigned char Command0[6] = {0x80, 0x1b, 0x02, 0x00, 0x00, 0x00};
 522         static const unsigned char Command1[6] = {0x20, 0x00, 0x00, 0x00, 0x00, 0x00};
 523
 524         unsigned char st[7];
 525         int status;
 526
 527         if ((status = card_send_command(ioaddr, name, Command0, st)))
 528                 return status;
 529         return card_send_command(ioaddr, name, Command1, st);
 530 }
 531
 532 static int
 533 sb1000_activate(const int ioaddr[], const char* name)
 534 {
 535         static const unsigned char Command0[6] = {0x80, 0x11, 0x00, 0x00, 0x00, 0x00};
 536         static const unsigned char Command1[6] = {0x80, 0x16, 0x00, 0x00, 0x00, 0x00};
 537
 538         unsigned char st[7];
 539         int status;
 540
 541         ssleep(1);
 542         if ((status = card_send_command(ioaddr, name, Command0, st)))
 543                 return status;
 544         if ((status = card_send_command(ioaddr, name, Command1, st)))
 545                 return status;
 546         if (st[3] != 0xf1) {
 547         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 548                         return status;
 549                 return -EIO;
 550         }
 551         udelay(1000);
 552     return sb1000_start_get_set_command(ioaddr, name);
 553 }
 554
 555 /* get SB1000 firmware version */
 556 static int
 557 sb1000_get_firmware_version(const int ioaddr[], const char* name,
 558         unsigned char version[], int do_end)
 559 {
 560         static const unsigned char Command0[6] = {0x80, 0x23, 0x00, 0x00, 0x00, 0x00};
 561
 562         unsigned char st[7];
 563         int status;
 564
 565         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 566                 return status;
 567         if ((status = card_send_command(ioaddr, name, Command0, st)))
 568                 return status;
 569         if (st[0] != 0xa3)
 570                 return -EIO;
 571         version[0] = st[1];
 572         version[1] = st[2];
 573         if (do_end)
 574                 return sb1000_end_get_set_command(ioaddr, name);
 575         else
 576                 return 0;
 577 }
 578
 579 /* get SB1000 frequency */
 580 static int
 581 sb1000_get_frequency(const int ioaddr[], const char* name, int* frequency)
 582 {
 583         static const unsigned char Command0[6] = {0x80, 0x44, 0x00, 0x00, 0x00, 0x00};
 584
 585         unsigned char st[7];
 586         int status;
 587
 588         udelay(1000);
 589         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 590                 return status;
 591         if ((status = card_send_command(ioaddr, name, Command0, st)))
 592                 return status;
 593         *frequency = ((st[1] << 8 | st[2]) << 8 | st[3]) << 8 | st[4];
 594         return sb1000_end_get_set_command(ioaddr, name);
 595 }
 596
 597 /* set SB1000 frequency */
 598 static int
 599 sb1000_set_frequency(const int ioaddr[], const char* name, int frequency)
 600 {
 601         unsigned char st[7];
 602         int status;
 603         unsigned char Command0[6] = {0x80, 0x29, 0x00, 0x00, 0x00, 0x00};
 604
 605         const int FrequencyLowerLimit = 57000;
 606         const int FrequencyUpperLimit = 804000;
 607
 608         if (frequency < FrequencyLowerLimit || frequency > FrequencyUpperLimit) {
 609                 printk(KERN_ERR "%s: frequency chosen (%d kHz) is not in the range "
 610                         "[%d,%d] kHz\n", name, frequency, FrequencyLowerLimit,
 611                         FrequencyUpperLimit);
 612                 return -EINVAL;
 613         }
 614         udelay(1000);
 615         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 616                 return status;
 617         Command0[5] = frequency & 0xff;
 618         frequency >>= 8;
 619         Command0[4] = frequency & 0xff;
 620         frequency >>= 8;
 621         Command0[3] = frequency & 0xff;
 622         frequency >>= 8;
 623         Command0[2] = frequency & 0xff;
 624         return card_send_command(ioaddr, name, Command0, st);
 625 }
 626
 627 /* get SB1000 PIDs */
 628 static int
 629 sb1000_get_PIDs(const int ioaddr[], const char* name, short PID[])
 630 {
 631         static const unsigned char Command0[6] = {0x80, 0x40, 0x00, 0x00, 0x00, 0x00};
 632         static const unsigned char Command1[6] = {0x80, 0x41, 0x00, 0x00, 0x00, 0x00};
 633         static const unsigned char Command2[6] = {0x80, 0x42, 0x00, 0x00, 0x00, 0x00};
 634         static const unsigned char Command3[6] = {0x80, 0x43, 0x00, 0x00, 0x00, 0x00};
 635
 636         unsigned char st[7];
 637         int status;
 638
 639         udelay(1000);
 640         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 641                 return status;
 642
 643         if ((status = card_send_command(ioaddr, name, Command0, st)))
 644                 return status;
 645         PID[0] = st[1] << 8 | st[2];
 646
 647         if ((status = card_send_command(ioaddr, name, Command1, st)))
 648                 return status;
 649         PID[1] = st[1] << 8 | st[2];
 650
 651         if ((status = card_send_command(ioaddr, name, Command2, st)))
 652                 return status;
 653         PID[2] = st[1] << 8 | st[2];
 654
 655         if ((status = card_send_command(ioaddr, name, Command3, st)))
 656                 return status;
 657         PID[3] = st[1] << 8 | st[2];
 658
 659         return sb1000_end_get_set_command(ioaddr, name);
 660 }
 661
 662 /* set SB1000 PIDs */
 663 static int
 664 sb1000_set_PIDs(const int ioaddr[], const char* name, const short PID[])
 665 {
 666         static const unsigned char Command4[6] = {0x80, 0x2e, 0x00, 0x00, 0x00, 0x00};
 667
 668         unsigned char st[7];
 669         short p;
 670         int status;
 671         unsigned char Command0[6] = {0x80, 0x31, 0x00, 0x00, 0x00, 0x00};
 672         unsigned char Command1[6] = {0x80, 0x32, 0x00, 0x00, 0x00, 0x00};
 673         unsigned char Command2[6] = {0x80, 0x33, 0x00, 0x00, 0x00, 0x00};
 674         unsigned char Command3[6] = {0x80, 0x34, 0x00, 0x00, 0x00, 0x00};
 675
 676         udelay(1000);
 677         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 678                 return status;
 679
 680         p = PID[0];
 681         Command0[3] = p & 0xff;
 682         p >>= 8;
 683         Command0[2] = p & 0xff;
 684         if ((status = card_send_command(ioaddr, name, Command0, st)))
 685                 return status;
 686
 687         p = PID[1];
 688         Command1[3] = p & 0xff;
 689         p >>= 8;
 690         Command1[2] = p & 0xff;
 691         if ((status = card_send_command(ioaddr, name, Command1, st)))
 692                 return status;
 693
 694         p = PID[2];
 695         Command2[3] = p & 0xff;
 696         p >>= 8;
 697         Command2[2] = p & 0xff;
 698         if ((status = card_send_command(ioaddr, name, Command2, st)))
 699                 return status;
 700
 701         p = PID[3];
 702         Command3[3] = p & 0xff;
 703         p >>= 8;
 704         Command3[2] = p & 0xff;
 705         if ((status = card_send_command(ioaddr, name, Command3, st)))
 706                 return status;
 707
 708         if ((status = card_send_command(ioaddr, name, Command4, st)))
 709                 return status;
 710         return sb1000_end_get_set_command(ioaddr, name);
 711 }
 712
 713
 714 static void
 715 sb1000_print_status_buffer(const char* name, unsigned char st[],
 716         unsigned char buffer[], int size)
 717 {
 718         int i, j, k;
 719
 720         printk(KERN_DEBUG "%s: status: %02x %02x\n", name, st[0], st[1]);
 721         if (buffer[24] == 0x08 && buffer[25] == 0x00 && buffer[26] == 0x45) {
 722                 printk(KERN_DEBUG "%s: length: %d protocol: %d from: %d.%d.%d.%d:%d "
 723                         "to %d.%d.%d.%d:%d\n", name, buffer[28] << 8 | buffer[29],
 724                         buffer[35], buffer[38], buffer[39], buffer[40], buffer[41],
 725             buffer[46] << 8 | buffer[47],
 726                         buffer[42], buffer[43], buffer[44], buffer[45],
 727             buffer[48] << 8 | buffer[49]);
 728         } else {
 729                 for (i = 0, k = 0; i < (size + 7) / 8; i++) {
 730                         printk(KERN_DEBUG "%s: %s", name, i ? "       " : "buffer:");
 731                         for (j = 0; j < 8 && k < size; j++, k++)
 732                                 printk(" %02x", buffer[k]);
 733                         printk("\n");
 734                 }
 735         }
 736         return;
 737 }
 738
 739 /*
 740  * SB1000 commands for frame rx interrupt
 741  */
 742 /* receive a single frame and assemble datagram
 743  * (this is the heart of the interrupt routine)
 744  */
 745 static int
 746 sb1000_rx(struct net_device *dev)
 747 {
 748
 749 #define FRAMESIZE 184
 750         unsigned char st[2], buffer[FRAMESIZE], session_id, frame_id;
 751         short dlen;
 752         int ioaddr, ns;
 753         unsigned int skbsize;
 754         struct sk_buff *skb;
 755         struct sb1000_private *lp = netdev_priv(dev);
 756         struct net_device_stats *stats = &dev->stats;
 757
 758         /* SB1000 frame constants */
 759         const int FrameSize = FRAMESIZE;
 760         const int NewDatagramHeaderSkip = 8;
 761         const int NewDatagramHeaderSize = NewDatagramHeaderSkip + 18;
 762         const int NewDatagramDataSize = FrameSize - NewDatagramHeaderSize;
 763         const int ContDatagramHeaderSkip = 7;
 764         const int ContDatagramHeaderSize = ContDatagramHeaderSkip + 1;
 765         const int ContDatagramDataSize = FrameSize - ContDatagramHeaderSize;
 766         const int TrailerSize = 4;
 767
 768         ioaddr = dev->base_addr;
 769
 770         insw(ioaddr, (unsigned short*) st, 1);
 771 #ifdef XXXDEBUG
 772 printk("cm0: received: %02x %02x\n", st[0], st[1]);
 773 #endif /* XXXDEBUG */
 774         lp->rx_frames++;
 775
 776         /* decide if it is a good or bad frame */
 777         for (ns = 0; ns < NPIDS; ns++) {
 778                 session_id = lp->rx_session_id[ns];
 779                 frame_id = lp->rx_frame_id[ns];
 780                 if (st[0] == session_id) {
 781                         if (st[1] == frame_id || (!frame_id && (st[1] & 0xf0) == 0x30)) {
 782                                 goto good_frame;
 783                         } else if ((st[1] & 0xf0) == 0x30 && (st[0] & 0x40)) {
 784                                 goto skipped_frame;
 785                         } else {
 786                                 goto bad_frame;
 787                         }
 788                 } else if (st[0] == (session_id | 0x40)) {
 789                         if ((st[1] & 0xf0) == 0x30) {
 790                                 goto skipped_frame;
 791                         } else {
 792                                 goto bad_frame;
 793                         }
 794                 }
 795         }
 796         goto bad_frame;
 797
 798 skipped_frame:
 799         stats->rx_frame_errors++;
 800         skb = lp->rx_skb[ns];
 801         if (sb1000_debug > 1)
 802                 printk(KERN_WARNING "%s: missing frame(s): got %02x %02x "
 803                         "expecting %02x %02x\n", dev->name, st[0], st[1],
 804                         skb ? session_id : session_id | 0x40, frame_id);
 805         if (skb) {
 806                 dev_kfree_skb(skb);
 807                 skb = NULL;
 808         }
 809
 810 good_frame:
 811         lp->rx_frame_id[ns] = 0x30 | ((st[1] + 1) & 0x0f);
 812         /* new datagram */
 813         if (st[0] & 0x40) {
 814                 /* get data length */
 815                 insw(ioaddr, buffer, NewDatagramHeaderSize / 2);
 816 #ifdef XXXDEBUG
 817 printk("cm0: IP identification: %02x%02x  fragment offset: %02x%02x\n", buffer[30], buffer[31], buffer[32], buffer[33]);
 818 #endif /* XXXDEBUG */
 819                 if (buffer[0] != NewDatagramHeaderSkip) {
 820                         if (sb1000_debug > 1)
 821                                 printk(KERN_WARNING "%s: new datagram header skip error: "
 822                                         "got %02x expecting %02x\n", dev->name, buffer[0],
 823                                         NewDatagramHeaderSkip);
 824                         stats->rx_length_errors++;
 825                         insw(ioaddr, buffer, NewDatagramDataSize / 2);
 826                         goto bad_frame_next;
 827                 }
 828                 dlen = ((buffer[NewDatagramHeaderSkip + 3] & 0x0f) << 8 |
 829                         buffer[NewDatagramHeaderSkip + 4]) - 17;
 830                 if (dlen > SB1000_MRU) {
 831                         if (sb1000_debug > 1)
 832                                 printk(KERN_WARNING "%s: datagram length (%d) greater "
 833                                         "than MRU (%d)\n", dev->name, dlen, SB1000_MRU);
 834                         stats->rx_length_errors++;
 835                         insw(ioaddr, buffer, NewDatagramDataSize / 2);
 836                         goto bad_frame_next;
 837                 }
 838                 lp->rx_dlen[ns] = dlen;
 839                 /* compute size to allocate for datagram */
 840                 skbsize = dlen + FrameSize;
 841                 if ((skb = alloc_skb(skbsize, GFP_ATOMIC)) == NULL) {
 842                         if (sb1000_debug > 1)
 843                                 printk(KERN_WARNING "%s: can't allocate %d bytes long "
 844                                         "skbuff\n", dev->name, skbsize);
 845                         stats->rx_dropped++;
 846                         insw(ioaddr, buffer, NewDatagramDataSize / 2);
 847                         goto dropped_frame;
 848                 }
 849                 skb->dev = dev;
 850                 skb_reset_mac_header(skb);
 851                 skb->protocol = (unsigned short) buffer[NewDatagramHeaderSkip + 16];
 852                 insw(ioaddr, skb_put(skb, NewDatagramDataSize),
 853                         NewDatagramDataSize / 2);
 854                 lp->rx_skb[ns] = skb;
 855         } else {
 856                 /* continuation of previous datagram */
 857                 insw(ioaddr, buffer, ContDatagramHeaderSize / 2);
 858                 if (buffer[0] != ContDatagramHeaderSkip) {
 859                         if (sb1000_debug > 1)
 860                                 printk(KERN_WARNING "%s: cont datagram header skip error: "
 861                                         "got %02x expecting %02x\n", dev->name, buffer[0],
 862                                         ContDatagramHeaderSkip);
 863                         stats->rx_length_errors++;
 864                         insw(ioaddr, buffer, ContDatagramDataSize / 2);
 865                         goto bad_frame_next;
 866                 }
 867                 skb = lp->rx_skb[ns];
 868                 insw(ioaddr, skb_put(skb, ContDatagramDataSize),
 869                         ContDatagramDataSize / 2);
 870                 dlen = lp->rx_dlen[ns];
 871         }
 872         if (skb->len < dlen + TrailerSize) {
 873                 lp->rx_session_id[ns] &= ~0x40;
 874                 return 0;
 875         }
 876
 877         /* datagram completed: send to upper level */
 878         skb_trim(skb, dlen);
 879         netif_rx(skb);
 880         stats->rx_bytes+=dlen;
 881         stats->rx_packets++;
 882         lp->rx_skb[ns] = NULL;
 883         lp->rx_session_id[ns] |= 0x40;
 884         return 0;
 885
 886 bad_frame:
 887         insw(ioaddr, buffer, FrameSize / 2);
 888         if (sb1000_debug > 1)
 889                 printk(KERN_WARNING "%s: frame error: got %02x %02x\n",
 890                         dev->name, st[0], st[1]);
 891         stats->rx_frame_errors++;
 892 bad_frame_next:
 893         if (sb1000_debug > 2)
 894                 sb1000_print_status_buffer(dev->name, st, buffer, FrameSize);
 895 dropped_frame:
 896         stats->rx_errors++;
 897         if (ns < NPIDS) {
 898                 if ((skb = lp->rx_skb[ns])) {
 899                         dev_kfree_skb(skb);
 900                         lp->rx_skb[ns] = NULL;
 901                 }
 902                 lp->rx_session_id[ns] |= 0x40;
 903         }
 904         return -1;
 905 }
 906
 907 static void
 908 sb1000_error_dpc(struct net_device *dev)
 909 {
 910         static const unsigned char Command0[6] = {0x80, 0x26, 0x00, 0x00, 0x00, 0x00};
 911
 912         char *name;
 913         unsigned char st[5];
 914         int ioaddr[2];
 915         struct sb1000_private *lp = netdev_priv(dev);
 916         const int ErrorDpcCounterInitialize = 200;
 917
 918         ioaddr[0] = dev->base_addr;
 919         /* mem_start holds the second I/O address */
 920         ioaddr[1] = dev->mem_start;
 921         name = dev->name;
 922
 923         sb1000_wait_for_ready_clear(ioaddr, name);
 924         sb1000_send_command(ioaddr, name, Command0);
 925         sb1000_wait_for_ready(ioaddr, name);
 926         sb1000_read_status(ioaddr, st);
 927         if (st[1] & 0x10)
 928                 lp->rx_error_dpc_count = ErrorDpcCounterInitialize;
 929         return;
 930 }
 931
 932
 933 /*
 934  * Linux interface functions
 935  */
 936 static int
 937 sb1000_open(struct net_device *dev)
 938 {
 939         char *name;
 940         int ioaddr[2], status;
 941         struct sb1000_private *lp = netdev_priv(dev);
 942         const unsigned short FirmwareVersion[] = {0x01, 0x01};
 943
 944         ioaddr[0] = dev->base_addr;
 945         /* mem_start holds the second I/O address */
 946         ioaddr[1] = dev->mem_start;
 947         name = dev->name;
 948
 949         /* initialize sb1000 */
 950         if ((status = sb1000_reset(ioaddr, name)))
 951                 return status;
 952         ssleep(1);
 953         if ((status = sb1000_check_CRC(ioaddr, name)))
 954                 return status;
 955
 956         /* initialize private data before board can catch interrupts */
 957         lp->rx_skb[0] = NULL;
 958         lp->rx_skb[1] = NULL;
 959         lp->rx_skb[2] = NULL;
 960         lp->rx_skb[3] = NULL;
 961         lp->rx_dlen[0] = 0;
 962         lp->rx_dlen[1] = 0;
 963         lp->rx_dlen[2] = 0;
 964         lp->rx_dlen[3] = 0;
 965         lp->rx_frames = 0;
 966         lp->rx_error_count = 0;
 967         lp->rx_error_dpc_count = 0;
 968         lp->rx_session_id[0] = 0x50;
 969         lp->rx_session_id[0] = 0x48;
 970         lp->rx_session_id[0] = 0x44;
 971         lp->rx_session_id[0] = 0x42;
 972         lp->rx_frame_id[0] = 0;
 973         lp->rx_frame_id[1] = 0;
 974         lp->rx_frame_id[2] = 0;
 975         lp->rx_frame_id[3] = 0;
 976         if (request_irq(dev->irq, sb1000_interrupt, 0, "sb1000", dev)) {
 977                 return -EAGAIN;
 978         }
 979
 980         if (sb1000_debug > 2)
 981                 printk(KERN_DEBUG "%s: Opening, IRQ %d\n", name, dev->irq);
 982
 983         /* Activate board and check firmware version */
 984         udelay(1000);
 985         if ((status = sb1000_activate(ioaddr, name)))
 986                 return status;
 987         udelay(0);
 988         if ((status = sb1000_get_firmware_version(ioaddr, name, version, 0)))
 989                 return status;
 990         if (version[0] != FirmwareVersion[0] || version[1] != FirmwareVersion[1])
 991                 printk(KERN_WARNING "%s: found firmware version %x.%02x "
 992                         "(should be %x.%02x)\n", name, version[0], version[1],
 993                         FirmwareVersion[0], FirmwareVersion[1]);
 994
 995
 996         netif_start_queue(dev);
 997         return 0;                                       /* Always succeed */
 998 }
 999
1000 static int sb1000_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1001 {
1002         char* name;
1003         unsigned char version[2];
1004         short PID[4];
1005         int ioaddr[2], status, frequency;
1006         unsigned int stats[5];
1007         struct sb1000_private *lp = netdev_priv(dev);
1008
1009         if (!(dev && dev->flags & IFF_UP))
1010                 return -ENODEV;
1011
1012         ioaddr[0] = dev->base_addr;
1013         /* mem_start holds the second I/O address */
1014         ioaddr[1] = dev->mem_start;
1015         name = dev->name;
1016
1017         switch (cmd) {
1018         case SIOCGCMSTATS:              /* get statistics */
1019                 stats[0] = dev->stats.rx_bytes;
1020                 stats[1] = lp->rx_frames;
1021                 stats[2] = dev->stats.rx_packets;
1022                 stats[3] = dev->stats.rx_errors;
1023                 stats[4] = dev->stats.rx_dropped;
1024                 if(copy_to_user(ifr->ifr_data, stats, sizeof(stats)))
1025                         return -EFAULT;
1026                 status = 0;
1027                 break;
1028
1029         case SIOCGCMFIRMWARE:           /* get firmware version */
1030                 if ((status = sb1000_get_firmware_version(ioaddr, name, version, 1)))
1031                         return status;
1032                 if(copy_to_user(ifr->ifr_data, version, sizeof(version)))
1033                         return -EFAULT;
1034                 break;
1035
1036         case SIOCGCMFREQUENCY:          /* get frequency */
1037                 if ((status = sb1000_get_frequency(ioaddr, name, &frequency)))
1038                         return status;
1039                 if(put_user(frequency, (int __user *) ifr->ifr_data))
1040                         return -EFAULT;
1041                 break;
1042
1043         case SIOCSCMFREQUENCY:          /* set frequency */
1044                 if (!capable(CAP_NET_ADMIN))
1045                         return -EPERM;
1046                 if(get_user(frequency, (int __user *) ifr->ifr_data))
1047                         return -EFAULT;
1048                 if ((status = sb1000_set_frequency(ioaddr, name, frequency)))
1049                         return status;
1050                 break;
1051
1052         case SIOCGCMPIDS:                       /* get PIDs */
1053                 if ((status = sb1000_get_PIDs(ioaddr, name, PID)))
1054                         return status;
1055                 if(copy_to_user(ifr->ifr_data, PID, sizeof(PID)))
1056                         return -EFAULT;
1057                 break;
1058
1059         case SIOCSCMPIDS:                       /* set PIDs */
1060                 if (!capable(CAP_NET_ADMIN))
1061                         return -EPERM;
1062                 if(copy_from_user(PID, ifr->ifr_data, sizeof(PID)))
1063                         return -EFAULT;
1064                 if ((status = sb1000_set_PIDs(ioaddr, name, PID)))
1065                         return status;
1066                 /* set session_id, frame_id and pkt_type too */
1067                 lp->rx_session_id[0] = 0x50 | (PID[0] & 0x0f);
1068                 lp->rx_session_id[1] = 0x48;
1069                 lp->rx_session_id[2] = 0x44;
1070                 lp->rx_session_id[3] = 0x42;
1071                 lp->rx_frame_id[0] = 0;
1072                 lp->rx_frame_id[1] = 0;
1073                 lp->rx_frame_id[2] = 0;
1074                 lp->rx_frame_id[3] = 0;
1075                 break;
1076
1077         default:
1078                 status = -EINVAL;
1079                 break;
1080         }
1081         return status;
1082 }
1083
1084 /* transmit function: do nothing since SB1000 can't send anything out */
1085 static netdev_tx_t
1086 sb1000_start_xmit(struct sk_buff *skb, struct net_device *dev)
1087 {
1088         printk(KERN_WARNING "%s: trying to transmit!!!\n", dev->name);
1089         /* sb1000 can't xmit datagrams */
1090         dev_kfree_skb(skb);
1091         return NETDEV_TX_OK;
1092 }
1093
1094 /* SB1000 interrupt handler. */
1095 static irqreturn_t sb1000_interrupt(int irq, void *dev_id)
1096 {
1097         static const unsigned char Command0[6] = {0x80, 0x2c, 0x00, 0x00, 0x00, 0x00};
1098         static const unsigned char Command1[6] = {0x80, 0x2e, 0x00, 0x00, 0x00, 0x00};
1099
1100         char *name;
1101         unsigned char st;
1102         int ioaddr[2];
1103         struct net_device *dev = dev_id;
1104         struct sb1000_private *lp = netdev_priv(dev);
1105
1106         const int MaxRxErrorCount = 6;
1107
1108         ioaddr[0] = dev->base_addr;
1109         /* mem_start holds the second I/O address */
1110         ioaddr[1] = dev->mem_start;
1111         name = dev->name;
1112
1113         /* is it a good interrupt? */
1114         st = inb(ioaddr[1] + 6);
1115         if (!(st & 0x08 && st & 0x20)) {
1116                 return IRQ_NONE;
1117         }
1118
1119         if (sb1000_debug > 3)
1120                 printk(KERN_DEBUG "%s: entering interrupt\n", dev->name);
1121
1122         st = inb(ioaddr[0] + 7);
1123         if (sb1000_rx(dev))
1124                 lp->rx_error_count++;
1125 #ifdef SB1000_DELAY
1126         udelay(SB1000_DELAY);
1127 #endif /* SB1000_DELAY */
1128         sb1000_issue_read_command(ioaddr, name);
1129         if (st & 0x01) {
1130                 sb1000_error_dpc(dev);
1131                 sb1000_issue_read_command(ioaddr, name);
1132         }
1133         if (lp->rx_error_dpc_count && !(--lp->rx_error_dpc_count)) {
1134                 sb1000_wait_for_ready_clear(ioaddr, name);
1135                 sb1000_send_command(ioaddr, name, Command0);
1136                 sb1000_wait_for_ready(ioaddr, name);
1137                 sb1000_issue_read_command(ioaddr, name);
1138         }
1139         if (lp->rx_error_count >= MaxRxErrorCount) {
1140                 sb1000_wait_for_ready_clear(ioaddr, name);
1141                 sb1000_send_command(ioaddr, name, Command1);
1142                 sb1000_wait_for_ready(ioaddr, name);
1143                 sb1000_issue_read_command(ioaddr, name);
1144                 lp->rx_error_count = 0;
1145         }
1146
1147         return IRQ_HANDLED;
1148 }
1149
1150 static int sb1000_close(struct net_device *dev)
1151 {
1152         int i;
1153         int ioaddr[2];
1154         struct sb1000_private *lp = netdev_priv(dev);
1155
1156         if (sb1000_debug > 2)
1157                 printk(KERN_DEBUG "%s: Shutting down sb1000.\n", dev->name);
1158
1159         netif_stop_queue(dev);
1160
1161         ioaddr[0] = dev->base_addr;
1162         /* mem_start holds the second I/O address */
1163         ioaddr[1] = dev->mem_start;
1164
1165         free_irq(dev->irq, dev);
1166         /* If we don't do this, we can't re-insmod it later. */
1167         release_region(ioaddr[1], SB1000_IO_EXTENT);
1168         release_region(ioaddr[0], SB1000_IO_EXTENT);
1169
1170         /* free rx_skb's if needed */
1171         for (i=0; i<4; i++) {
1172                 if (lp->rx_skb[i]) {
1173                         dev_kfree_skb(lp->rx_skb[i]);
1174                 }
1175         }
1176         return 0;
1177 }
1178
1179 MODULE_AUTHOR("Franco Venturi <fventuri@mediaone.net>");
1180 MODULE_DESCRIPTION("General Instruments SB1000 driver");
1181 MODULE_LICENSE("GPL");
1182
1183 static int __init
1184 sb1000_init(void)
1185 {
1186         return pnp_register_driver(&sb1000_driver);
1187 }
1188
1189 static void __exit
1190 sb1000_exit(void)
1191 {
1192         pnp_unregister_driver(&sb1000_driver);
1193 }
1194
1195 module_init(sb1000_init);
1196 module_exit(sb1000_exit);