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