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         struct net_device_stats stats;
  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 int sb1000_start_xmit(struct sk_buff *skb, struct net_device *dev);
  87 static irqreturn_t sb1000_interrupt(int irq, void *dev_id);
  88 static struct net_device_stats *sb1000_stats(struct net_device *dev);
  89 static int sb1000_close(struct net_device *dev);
  90
  91
  92 /* SB1000 hardware routines to be used during open/configuration phases */
  93 static inline int card_wait_for_busy_clear(const int ioaddr[],
  94         const char* name);
  95 static inline 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 inline int sb1000_wait_for_ready(const int ioaddr[], const char* name);
 102 static inline int sb1000_wait_for_ready_clear(const int ioaddr[],
 103         const char* name);
 104 static inline void sb1000_send_command(const int ioaddr[], const char* name,
 105         const unsigned char out[]);
 106 static inline void sb1000_read_status(const int ioaddr[], unsigned char in[]);
 107 static inline void sb1000_issue_read_command(const int ioaddr[],
 108         const char* name);
 109
 110 /* SB1000 commands for open/configuration */
 111 static inline int sb1000_reset(const int ioaddr[], const char* name);
 112 static inline 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 inline int sb1000_end_get_set_command(const int ioaddr[],
 116         const char* name);
 117 static inline 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 inline int sb1000_rx(struct net_device *dev);
 131 static inline 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 int
 140 sb1000_probe_one(struct pnp_dev *pdev, const struct pnp_device_id *id)
 141 {
 142         struct net_device *dev;
 143         unsigned short ioaddr[2], irq;
 144         unsigned int serial_number;
 145         int error = -ENODEV;
 146
 147         if (pnp_device_attach(pdev) < 0)
 148                 return -ENODEV;
 149         if (pnp_activate_dev(pdev) < 0)
 150                 goto out_detach;
 151
 152         if (!pnp_port_valid(pdev, 0) || !pnp_port_valid(pdev, 1))
 153                 goto out_disable;
 154         if (!pnp_irq_valid(pdev, 0))
 155                 goto out_disable;
 156
 157         serial_number = pdev->card->serial;
 158
 159         ioaddr[0] = pnp_port_start(pdev, 0);
 160         ioaddr[1] = pnp_port_start(pdev, 0);
 161
 162         irq = pnp_irq(pdev, 0);
 163
 164         if (!request_region(ioaddr[0], 16, "sb1000"))
 165                 goto out_disable;
 166         if (!request_region(ioaddr[1], 16, "sb1000"))
 167                 goto out_release_region0;
 168
 169         dev = alloc_etherdev(sizeof(struct sb1000_private));
 170         if (!dev) {
 171                 error = -ENOMEM;
 172                 goto out_release_regions;
 173         }
 174
 175
 176         dev->base_addr = ioaddr[0];
 177         /* mem_start holds the second I/O address */
 178         dev->mem_start = ioaddr[1];
 179         dev->irq = irq;
 180
 181         if (sb1000_debug > 0)
 182                 printk(KERN_NOTICE "%s: sb1000 at (%#3.3lx,%#3.3lx), "
 183                         "S/N %#8.8x, IRQ %d.\n", dev->name, dev->base_addr,
 184                         dev->mem_start, serial_number, dev->irq);
 185
 186         /*
 187          * The SB1000 is an rx-only cable modem device.  The uplink is a modem
 188          * and we do not want to arp on it.
 189          */
 190         dev->flags = IFF_POINTOPOINT|IFF_NOARP;
 191
 192         SET_MODULE_OWNER(dev);
 193         SET_NETDEV_DEV(dev, &pdev->dev);
 194
 195         if (sb1000_debug > 0)
 196                 printk(KERN_NOTICE "%s", version);
 197
 198         /* The SB1000-specific entries in the device structure. */
 199         dev->open               = sb1000_open;
 200         dev->do_ioctl           = sb1000_dev_ioctl;
 201         dev->hard_start_xmit    = sb1000_start_xmit;
 202         dev->stop               = sb1000_close;
 203         dev->get_stats          = sb1000_stats;
 204
 205         /* hardware address is 0:0:serial_number */
 206         dev->dev_addr[2]        = serial_number >> 24 & 0xff;
 207         dev->dev_addr[3]        = serial_number >> 16 & 0xff;
 208         dev->dev_addr[4]        = serial_number >>  8 & 0xff;
 209         dev->dev_addr[5]        = serial_number >>  0 & 0xff;
 210
 211         pnp_set_drvdata(pdev, dev);
 212
 213         error = register_netdev(dev);
 214         if (error)
 215                 goto out_free_netdev;
 216         return 0;
 217
 218  out_free_netdev:
 219         free_netdev(dev);
 220  out_release_regions:
 221         release_region(ioaddr[1], 16);
 222  out_release_region0:
 223         release_region(ioaddr[0], 16);
 224  out_disable:
 225         pnp_disable_dev(pdev);
 226  out_detach:
 227         pnp_device_detach(pdev);
 228         return error;
 229 }
 230
 231 static void
 232 sb1000_remove_one(struct pnp_dev *pdev)
 233 {
 234         struct net_device *dev = pnp_get_drvdata(pdev);
 235
 236         unregister_netdev(dev);
 237         release_region(dev->base_addr, 16);
 238         release_region(dev->mem_start, 16);
 239         free_netdev(dev);
 240 }
 241
 242 static struct pnp_driver sb1000_driver = {
 243         .name           = "sb1000",
 244         .id_table       = sb1000_pnp_ids,
 245         .probe          = sb1000_probe_one,
 246         .remove         = sb1000_remove_one,
 247 };
 248
 249
 250 /*
 251  * SB1000 hardware routines to be used during open/configuration phases
 252  */
 253
 254 static const int TimeOutJiffies = (875 * HZ) / 100;
 255
 256 /* Card Wait For Busy Clear (cannot be used during an interrupt) */
 257 static inline int
 258 card_wait_for_busy_clear(const int ioaddr[], const char* name)
 259 {
 260         unsigned char a;
 261         unsigned long timeout;
 262
 263         a = inb(ioaddr[0] + 7);
 264         timeout = jiffies + TimeOutJiffies;
 265         while (a & 0x80 || a & 0x40) {
 266                 /* a little sleep */
 267                 yield();
 268
 269                 a = inb(ioaddr[0] + 7);
 270                 if (time_after_eq(jiffies, timeout)) {
 271                         printk(KERN_WARNING "%s: card_wait_for_busy_clear timeout\n",
 272                                 name);
 273                         return -ETIME;
 274                 }
 275         }
 276
 277         return 0;
 278 }
 279
 280 /* Card Wait For Ready (cannot be used during an interrupt) */
 281 static inline int
 282 card_wait_for_ready(const int ioaddr[], const char* name, unsigned char in[])
 283 {
 284         unsigned char a;
 285         unsigned long timeout;
 286
 287         a = inb(ioaddr[1] + 6);
 288         timeout = jiffies + TimeOutJiffies;
 289         while (a & 0x80 || !(a & 0x40)) {
 290                 /* a little sleep */
 291                 yield();
 292
 293                 a = inb(ioaddr[1] + 6);
 294                 if (time_after_eq(jiffies, timeout)) {
 295                         printk(KERN_WARNING "%s: card_wait_for_ready timeout\n",
 296                                 name);
 297                         return -ETIME;
 298                 }
 299         }
 300
 301         in[1] = inb(ioaddr[0] + 1);
 302         in[2] = inb(ioaddr[0] + 2);
 303         in[3] = inb(ioaddr[0] + 3);
 304         in[4] = inb(ioaddr[0] + 4);
 305         in[0] = inb(ioaddr[0] + 5);
 306         in[6] = inb(ioaddr[0] + 6);
 307         in[5] = inb(ioaddr[1] + 6);
 308         return 0;
 309 }
 310
 311 /* Card Send Command (cannot be used during an interrupt) */
 312 static int
 313 card_send_command(const int ioaddr[], const char* name,
 314         const unsigned char out[], unsigned char in[])
 315 {
 316         int status, x;
 317
 318         if ((status = card_wait_for_busy_clear(ioaddr, name)))
 319                 return status;
 320         outb(0xa0, ioaddr[0] + 6);
 321         outb(out[2], ioaddr[0] + 1);
 322         outb(out[3], ioaddr[0] + 2);
 323         outb(out[4], ioaddr[0] + 3);
 324         outb(out[5], ioaddr[0] + 4);
 325         outb(out[1], ioaddr[0] + 5);
 326         outb(0xa0, ioaddr[0] + 6);
 327         outb(out[0], ioaddr[0] + 7);
 328         if (out[0] != 0x20 && out[0] != 0x30) {
 329                 if ((status = card_wait_for_ready(ioaddr, name, in)))
 330                         return status;
 331                 inb(ioaddr[0] + 7);
 332                 if (sb1000_debug > 3)
 333                         printk(KERN_DEBUG "%s: card_send_command "
 334                                 "out: %02x%02x%02x%02x%02x%02x  "
 335                                 "in: %02x%02x%02x%02x%02x%02x%02x\n", name,
 336                                 out[0], out[1], out[2], out[3], out[4], out[5],
 337                                 in[0], in[1], in[2], in[3], in[4], in[5], in[6]);
 338         } else {
 339                 if (sb1000_debug > 3)
 340                         printk(KERN_DEBUG "%s: card_send_command "
 341                                 "out: %02x%02x%02x%02x%02x%02x\n", name,
 342                                 out[0], out[1], out[2], out[3], out[4], out[5]);
 343         }
 344
 345         if (out[1] == 0x1b) {
 346                 x = (out[2] == 0x02);
 347         } else {
 348                 if (out[0] >= 0x80 && in[0] != (out[1] | 0x80))
 349                         return -EIO;
 350         }
 351         return 0;
 352 }
 353
 354
 355 /*
 356  * SB1000 hardware routines to be used during frame rx interrupt
 357  */
 358 static const int Sb1000TimeOutJiffies = 7 * HZ;
 359
 360 /* Card Wait For Ready (to be used during frame rx) */
 361 static inline int
 362 sb1000_wait_for_ready(const int ioaddr[], const char* name)
 363 {
 364         unsigned long timeout;
 365
 366         timeout = jiffies + Sb1000TimeOutJiffies;
 367         while (inb(ioaddr[1] + 6) & 0x80) {
 368                 if (time_after_eq(jiffies, timeout)) {
 369                         printk(KERN_WARNING "%s: sb1000_wait_for_ready timeout\n",
 370                                 name);
 371                         return -ETIME;
 372                 }
 373         }
 374         timeout = jiffies + Sb1000TimeOutJiffies;
 375         while (!(inb(ioaddr[1] + 6) & 0x40)) {
 376                 if (time_after_eq(jiffies, timeout)) {
 377                         printk(KERN_WARNING "%s: sb1000_wait_for_ready timeout\n",
 378                                 name);
 379                         return -ETIME;
 380                 }
 381         }
 382         inb(ioaddr[0] + 7);
 383         return 0;
 384 }
 385
 386 /* Card Wait For Ready Clear (to be used during frame rx) */
 387 static inline int
 388 sb1000_wait_for_ready_clear(const int ioaddr[], const char* name)
 389 {
 390         unsigned long timeout;
 391
 392         timeout = jiffies + Sb1000TimeOutJiffies;
 393         while (inb(ioaddr[1] + 6) & 0x80) {
 394                 if (time_after_eq(jiffies, timeout)) {
 395                         printk(KERN_WARNING "%s: sb1000_wait_for_ready_clear timeout\n",
 396                                 name);
 397                         return -ETIME;
 398                 }
 399         }
 400         timeout = jiffies + Sb1000TimeOutJiffies;
 401         while (inb(ioaddr[1] + 6) & 0x40) {
 402                 if (time_after_eq(jiffies, timeout)) {
 403                         printk(KERN_WARNING "%s: sb1000_wait_for_ready_clear timeout\n",
 404                                 name);
 405                         return -ETIME;
 406                 }
 407         }
 408         return 0;
 409 }
 410
 411 /* Card Send Command (to be used during frame rx) */
 412 static inline void
 413 sb1000_send_command(const int ioaddr[], const char* name,
 414         const unsigned char out[])
 415 {
 416         outb(out[2], ioaddr[0] + 1);
 417         outb(out[3], ioaddr[0] + 2);
 418         outb(out[4], ioaddr[0] + 3);
 419         outb(out[5], ioaddr[0] + 4);
 420         outb(out[1], ioaddr[0] + 5);
 421         outb(out[0], ioaddr[0] + 7);
 422         if (sb1000_debug > 3)
 423                 printk(KERN_DEBUG "%s: sb1000_send_command out: %02x%02x%02x%02x"
 424                         "%02x%02x\n", name, out[0], out[1], out[2], out[3], out[4], out[5]);
 425         return;
 426 }
 427
 428 /* Card Read Status (to be used during frame rx) */
 429 static inline void
 430 sb1000_read_status(const int ioaddr[], unsigned char in[])
 431 {
 432         in[1] = inb(ioaddr[0] + 1);
 433         in[2] = inb(ioaddr[0] + 2);
 434         in[3] = inb(ioaddr[0] + 3);
 435         in[4] = inb(ioaddr[0] + 4);
 436         in[0] = inb(ioaddr[0] + 5);
 437         return;
 438 }
 439
 440 /* Issue Read Command (to be used during frame rx) */
 441 static inline void
 442 sb1000_issue_read_command(const int ioaddr[], const char* name)
 443 {
 444         const unsigned char Command0[6] = {0x20, 0x00, 0x00, 0x01, 0x00, 0x00};
 445
 446         sb1000_wait_for_ready_clear(ioaddr, name);
 447         outb(0xa0, ioaddr[0] + 6);
 448         sb1000_send_command(ioaddr, name, Command0);
 449         return;
 450 }
 451
 452
 453 /*
 454  * SB1000 commands for open/configuration
 455  */
 456 /* reset SB1000 card */
 457 static inline int
 458 sb1000_reset(const int ioaddr[], const char* name)
 459 {
 460         unsigned char st[7];
 461         int port, status;
 462         const unsigned char Command0[6] = {0x80, 0x16, 0x00, 0x00, 0x00, 0x00};
 463
 464         port = ioaddr[1] + 6;
 465         outb(0x4, port);
 466         inb(port);
 467         udelay(1000);
 468         outb(0x0, port);
 469         inb(port);
 470         ssleep(1);
 471         outb(0x4, port);
 472         inb(port);
 473         udelay(1000);
 474         outb(0x0, port);
 475         inb(port);
 476         udelay(0);
 477
 478         if ((status = card_send_command(ioaddr, name, Command0, st)))
 479                 return status;
 480         if (st[3] != 0xf0)
 481                 return -EIO;
 482         return 0;
 483 }
 484
 485 /* check SB1000 firmware CRC */
 486 static inline int
 487 sb1000_check_CRC(const int ioaddr[], const char* name)
 488 {
 489         unsigned char st[7];
 490         int crc, status;
 491         const unsigned char Command0[6] = {0x80, 0x1f, 0x00, 0x00, 0x00, 0x00};
 492
 493         /* check CRC */
 494         if ((status = card_send_command(ioaddr, name, Command0, st)))
 495                 return status;
 496         if (st[1] != st[3] || st[2] != st[4])
 497                 return -EIO;
 498         crc = st[1] << 8 | st[2];
 499         return 0;
 500 }
 501
 502 static inline int
 503 sb1000_start_get_set_command(const int ioaddr[], const char* name)
 504 {
 505         unsigned char st[7];
 506         const unsigned char Command0[6] = {0x80, 0x1b, 0x00, 0x00, 0x00, 0x00};
 507
 508         return card_send_command(ioaddr, name, Command0, st);
 509 }
 510
 511 static inline int
 512 sb1000_end_get_set_command(const int ioaddr[], const char* name)
 513 {
 514         unsigned char st[7];
 515         int status;
 516         const unsigned char Command0[6] = {0x80, 0x1b, 0x02, 0x00, 0x00, 0x00};
 517         const unsigned char Command1[6] = {0x20, 0x00, 0x00, 0x00, 0x00, 0x00};
 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 inline int
 525 sb1000_activate(const int ioaddr[], const char* name)
 526 {
 527         unsigned char st[7];
 528         int status;
 529         const unsigned char Command0[6] = {0x80, 0x11, 0x00, 0x00, 0x00, 0x00};
 530         const unsigned char Command1[6] = {0x80, 0x16, 0x00, 0x00, 0x00, 0x00};
 531
 532         ssleep(1);
 533         if ((status = card_send_command(ioaddr, name, Command0, st)))
 534                 return status;
 535         if ((status = card_send_command(ioaddr, name, Command1, st)))
 536                 return status;
 537         if (st[3] != 0xf1) {
 538         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 539                         return status;
 540                 return -EIO;
 541         }
 542         udelay(1000);
 543     return sb1000_start_get_set_command(ioaddr, name);
 544 }
 545
 546 /* get SB1000 firmware version */
 547 static int
 548 sb1000_get_firmware_version(const int ioaddr[], const char* name,
 549         unsigned char version[], int do_end)
 550 {
 551         unsigned char st[7];
 552         int status;
 553         const unsigned char Command0[6] = {0x80, 0x23, 0x00, 0x00, 0x00, 0x00};
 554
 555         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 556                 return status;
 557         if ((status = card_send_command(ioaddr, name, Command0, st)))
 558                 return status;
 559         if (st[0] != 0xa3)
 560                 return -EIO;
 561         version[0] = st[1];
 562         version[1] = st[2];
 563         if (do_end)
 564                 return sb1000_end_get_set_command(ioaddr, name);
 565         else
 566                 return 0;
 567 }
 568
 569 /* get SB1000 frequency */
 570 static int
 571 sb1000_get_frequency(const int ioaddr[], const char* name, int* frequency)
 572 {
 573         unsigned char st[7];
 574         int status;
 575         const unsigned char Command0[6] = {0x80, 0x44, 0x00, 0x00, 0x00, 0x00};
 576
 577         udelay(1000);
 578         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 579                 return status;
 580         if ((status = card_send_command(ioaddr, name, Command0, st)))
 581                 return status;
 582         *frequency = ((st[1] << 8 | st[2]) << 8 | st[3]) << 8 | st[4];
 583         return sb1000_end_get_set_command(ioaddr, name);
 584 }
 585
 586 /* set SB1000 frequency */
 587 static int
 588 sb1000_set_frequency(const int ioaddr[], const char* name, int frequency)
 589 {
 590         unsigned char st[7];
 591         int status;
 592         unsigned char Command0[6] = {0x80, 0x29, 0x00, 0x00, 0x00, 0x00};
 593
 594         const int FrequencyLowerLimit = 57000;
 595         const int FrequencyUpperLimit = 804000;
 596
 597         if (frequency < FrequencyLowerLimit || frequency > FrequencyUpperLimit) {
 598                 printk(KERN_ERR "%s: frequency chosen (%d kHz) is not in the range "
 599                         "[%d,%d] kHz\n", name, frequency, FrequencyLowerLimit,
 600                         FrequencyUpperLimit);
 601                 return -EINVAL;
 602         }
 603         udelay(1000);
 604         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 605                 return status;
 606         Command0[5] = frequency & 0xff;
 607         frequency >>= 8;
 608         Command0[4] = frequency & 0xff;
 609         frequency >>= 8;
 610         Command0[3] = frequency & 0xff;
 611         frequency >>= 8;
 612         Command0[2] = frequency & 0xff;
 613         return card_send_command(ioaddr, name, Command0, st);
 614 }
 615
 616 /* get SB1000 PIDs */
 617 static int
 618 sb1000_get_PIDs(const int ioaddr[], const char* name, short PID[])
 619 {
 620         unsigned char st[7];
 621         int status;
 622         const unsigned char Command0[6] = {0x80, 0x40, 0x00, 0x00, 0x00, 0x00};
 623         const unsigned char Command1[6] = {0x80, 0x41, 0x00, 0x00, 0x00, 0x00};
 624         const unsigned char Command2[6] = {0x80, 0x42, 0x00, 0x00, 0x00, 0x00};
 625         const unsigned char Command3[6] = {0x80, 0x43, 0x00, 0x00, 0x00, 0x00};
 626
 627         udelay(1000);
 628         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 629                 return status;
 630
 631         if ((status = card_send_command(ioaddr, name, Command0, st)))
 632                 return status;
 633         PID[0] = st[1] << 8 | st[2];
 634
 635         if ((status = card_send_command(ioaddr, name, Command1, st)))
 636                 return status;
 637         PID[1] = st[1] << 8 | st[2];
 638
 639         if ((status = card_send_command(ioaddr, name, Command2, st)))
 640                 return status;
 641         PID[2] = st[1] << 8 | st[2];
 642
 643         if ((status = card_send_command(ioaddr, name, Command3, st)))
 644                 return status;
 645         PID[3] = st[1] << 8 | st[2];
 646
 647         return sb1000_end_get_set_command(ioaddr, name);
 648 }
 649
 650 /* set SB1000 PIDs */
 651 static int
 652 sb1000_set_PIDs(const int ioaddr[], const char* name, const short PID[])
 653 {
 654         unsigned char st[7];
 655         short p;
 656         int status;
 657         unsigned char Command0[6] = {0x80, 0x31, 0x00, 0x00, 0x00, 0x00};
 658         unsigned char Command1[6] = {0x80, 0x32, 0x00, 0x00, 0x00, 0x00};
 659         unsigned char Command2[6] = {0x80, 0x33, 0x00, 0x00, 0x00, 0x00};
 660         unsigned char Command3[6] = {0x80, 0x34, 0x00, 0x00, 0x00, 0x00};
 661         const unsigned char Command4[6] = {0x80, 0x2e, 0x00, 0x00, 0x00, 0x00};
 662
 663         udelay(1000);
 664         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 665                 return status;
 666
 667         p = PID[0];
 668         Command0[3] = p & 0xff;
 669         p >>= 8;
 670         Command0[2] = p & 0xff;
 671         if ((status = card_send_command(ioaddr, name, Command0, st)))
 672                 return status;
 673
 674         p = PID[1];
 675         Command1[3] = p & 0xff;
 676         p >>= 8;
 677         Command1[2] = p & 0xff;
 678         if ((status = card_send_command(ioaddr, name, Command1, st)))
 679                 return status;
 680
 681         p = PID[2];
 682         Command2[3] = p & 0xff;
 683         p >>= 8;
 684         Command2[2] = p & 0xff;
 685         if ((status = card_send_command(ioaddr, name, Command2, st)))
 686                 return status;
 687
 688         p = PID[3];
 689         Command3[3] = p & 0xff;
 690         p >>= 8;
 691         Command3[2] = p & 0xff;
 692         if ((status = card_send_command(ioaddr, name, Command3, st)))
 693                 return status;
 694
 695         if ((status = card_send_command(ioaddr, name, Command4, st)))
 696                 return status;
 697         return sb1000_end_get_set_command(ioaddr, name);
 698 }
 699
 700
 701 static inline void
 702 sb1000_print_status_buffer(const char* name, unsigned char st[],
 703         unsigned char buffer[], int size)
 704 {
 705         int i, j, k;
 706
 707         printk(KERN_DEBUG "%s: status: %02x %02x\n", name, st[0], st[1]);
 708         if (buffer[24] == 0x08 && buffer[25] == 0x00 && buffer[26] == 0x45) {
 709                 printk(KERN_DEBUG "%s: length: %d protocol: %d from: %d.%d.%d.%d:%d "
 710                         "to %d.%d.%d.%d:%d\n", name, buffer[28] << 8 | buffer[29],
 711                         buffer[35], buffer[38], buffer[39], buffer[40], buffer[41],
 712             buffer[46] << 8 | buffer[47],
 713                         buffer[42], buffer[43], buffer[44], buffer[45],
 714             buffer[48] << 8 | buffer[49]);
 715         } else {
 716                 for (i = 0, k = 0; i < (size + 7) / 8; i++) {
 717                         printk(KERN_DEBUG "%s: %s", name, i ? "       " : "buffer:");
 718                         for (j = 0; j < 8 && k < size; j++, k++)
 719                                 printk(" %02x", buffer[k]);
 720                         printk("\n");
 721                 }
 722         }
 723         return;
 724 }
 725
 726 /*
 727  * SB1000 commands for frame rx interrupt
 728  */
 729 /* receive a single frame and assemble datagram
 730  * (this is the heart of the interrupt routine)
 731  */
 732 static inline int
 733 sb1000_rx(struct net_device *dev)
 734 {
 735
 736 #define FRAMESIZE 184
 737         unsigned char st[2], buffer[FRAMESIZE], session_id, frame_id;
 738         short dlen;
 739         int ioaddr, ns;
 740         unsigned int skbsize;
 741         struct sk_buff *skb;
 742         struct sb1000_private *lp = netdev_priv(dev);
 743         struct net_device_stats *stats = &lp->stats;
 744
 745         /* SB1000 frame constants */
 746         const int FrameSize = FRAMESIZE;
 747         const int NewDatagramHeaderSkip = 8;
 748         const int NewDatagramHeaderSize = NewDatagramHeaderSkip + 18;
 749         const int NewDatagramDataSize = FrameSize - NewDatagramHeaderSize;
 750         const int ContDatagramHeaderSkip = 7;
 751         const int ContDatagramHeaderSize = ContDatagramHeaderSkip + 1;
 752         const int ContDatagramDataSize = FrameSize - ContDatagramHeaderSize;
 753         const int TrailerSize = 4;
 754
 755         ioaddr = dev->base_addr;
 756
 757         insw(ioaddr, (unsigned short*) st, 1);
 758 #ifdef XXXDEBUG
 759 printk("cm0: received: %02x %02x\n", st[0], st[1]);
 760 #endif /* XXXDEBUG */
 761         lp->rx_frames++;
 762
 763         /* decide if it is a good or bad frame */
 764         for (ns = 0; ns < NPIDS; ns++) {
 765                 session_id = lp->rx_session_id[ns];
 766                 frame_id = lp->rx_frame_id[ns];
 767                 if (st[0] == session_id) {
 768                         if (st[1] == frame_id || (!frame_id && (st[1] & 0xf0) == 0x30)) {
 769                                 goto good_frame;
 770                         } else if ((st[1] & 0xf0) == 0x30 && (st[0] & 0x40)) {
 771                                 goto skipped_frame;
 772                         } else {
 773                                 goto bad_frame;
 774                         }
 775                 } else if (st[0] == (session_id | 0x40)) {
 776                         if ((st[1] & 0xf0) == 0x30) {
 777                                 goto skipped_frame;
 778                         } else {
 779                                 goto bad_frame;
 780                         }
 781                 }
 782         }
 783         goto bad_frame;
 784
 785 skipped_frame:
 786         stats->rx_frame_errors++;
 787         skb = lp->rx_skb[ns];
 788         if (sb1000_debug > 1)
 789                 printk(KERN_WARNING "%s: missing frame(s): got %02x %02x "
 790                         "expecting %02x %02x\n", dev->name, st[0], st[1],
 791                         skb ? session_id : session_id | 0x40, frame_id);
 792         if (skb) {
 793                 dev_kfree_skb(skb);
 794                 skb = NULL;
 795         }
 796
 797 good_frame:
 798         lp->rx_frame_id[ns] = 0x30 | ((st[1] + 1) & 0x0f);
 799         /* new datagram */
 800         if (st[0] & 0x40) {
 801                 /* get data length */
 802                 insw(ioaddr, buffer, NewDatagramHeaderSize / 2);
 803 #ifdef XXXDEBUG
 804 printk("cm0: IP identification: %02x%02x  fragment offset: %02x%02x\n", buffer[30], buffer[31], buffer[32], buffer[33]);
 805 #endif /* XXXDEBUG */
 806                 if (buffer[0] != NewDatagramHeaderSkip) {
 807                         if (sb1000_debug > 1)
 808                                 printk(KERN_WARNING "%s: new datagram header skip error: "
 809                                         "got %02x expecting %02x\n", dev->name, buffer[0],
 810                                         NewDatagramHeaderSkip);
 811                         stats->rx_length_errors++;
 812                         insw(ioaddr, buffer, NewDatagramDataSize / 2);
 813                         goto bad_frame_next;
 814                 }
 815                 dlen = ((buffer[NewDatagramHeaderSkip + 3] & 0x0f) << 8 |
 816                         buffer[NewDatagramHeaderSkip + 4]) - 17;
 817                 if (dlen > SB1000_MRU) {
 818                         if (sb1000_debug > 1)
 819                                 printk(KERN_WARNING "%s: datagram length (%d) greater "
 820                                         "than MRU (%d)\n", dev->name, dlen, SB1000_MRU);
 821                         stats->rx_length_errors++;
 822                         insw(ioaddr, buffer, NewDatagramDataSize / 2);
 823                         goto bad_frame_next;
 824                 }
 825                 lp->rx_dlen[ns] = dlen;
 826                 /* compute size to allocate for datagram */
 827                 skbsize = dlen + FrameSize;
 828                 if ((skb = alloc_skb(skbsize, GFP_ATOMIC)) == NULL) {
 829                         if (sb1000_debug > 1)
 830                                 printk(KERN_WARNING "%s: can't allocate %d bytes long "
 831                                         "skbuff\n", dev->name, skbsize);
 832                         stats->rx_dropped++;
 833                         insw(ioaddr, buffer, NewDatagramDataSize / 2);
 834                         goto dropped_frame;
 835                 }
 836                 skb->dev = dev;
 837                 skb_reset_mac_header(skb);
 838                 skb->protocol = (unsigned short) buffer[NewDatagramHeaderSkip + 16];
 839                 insw(ioaddr, skb_put(skb, NewDatagramDataSize),
 840                         NewDatagramDataSize / 2);
 841                 lp->rx_skb[ns] = skb;
 842         } else {
 843                 /* continuation of previous datagram */
 844                 insw(ioaddr, buffer, ContDatagramHeaderSize / 2);
 845                 if (buffer[0] != ContDatagramHeaderSkip) {
 846                         if (sb1000_debug > 1)
 847                                 printk(KERN_WARNING "%s: cont datagram header skip error: "
 848                                         "got %02x expecting %02x\n", dev->name, buffer[0],
 849                                         ContDatagramHeaderSkip);
 850                         stats->rx_length_errors++;
 851                         insw(ioaddr, buffer, ContDatagramDataSize / 2);
 852                         goto bad_frame_next;
 853                 }
 854                 skb = lp->rx_skb[ns];
 855                 insw(ioaddr, skb_put(skb, ContDatagramDataSize),
 856                         ContDatagramDataSize / 2);
 857                 dlen = lp->rx_dlen[ns];
 858         }
 859         if (skb->len < dlen + TrailerSize) {
 860                 lp->rx_session_id[ns] &= ~0x40;
 861                 return 0;
 862         }
 863
 864         /* datagram completed: send to upper level */
 865         skb_trim(skb, dlen);
 866         netif_rx(skb);
 867         dev->last_rx = jiffies;
 868         stats->rx_bytes+=dlen;
 869         stats->rx_packets++;
 870         lp->rx_skb[ns] = NULL;
 871         lp->rx_session_id[ns] |= 0x40;
 872         return 0;
 873
 874 bad_frame:
 875         insw(ioaddr, buffer, FrameSize / 2);
 876         if (sb1000_debug > 1)
 877                 printk(KERN_WARNING "%s: frame error: got %02x %02x\n",
 878                         dev->name, st[0], st[1]);
 879         stats->rx_frame_errors++;
 880 bad_frame_next:
 881         if (sb1000_debug > 2)
 882                 sb1000_print_status_buffer(dev->name, st, buffer, FrameSize);
 883 dropped_frame:
 884         stats->rx_errors++;
 885         if (ns < NPIDS) {
 886                 if ((skb = lp->rx_skb[ns])) {
 887                         dev_kfree_skb(skb);
 888                         lp->rx_skb[ns] = NULL;
 889                 }
 890                 lp->rx_session_id[ns] |= 0x40;
 891         }
 892         return -1;
 893 }
 894
 895 static inline void
 896 sb1000_error_dpc(struct net_device *dev)
 897 {
 898         char *name;
 899         unsigned char st[5];
 900         int ioaddr[2];
 901         struct sb1000_private *lp = netdev_priv(dev);
 902         const unsigned char Command0[6] = {0x80, 0x26, 0x00, 0x00, 0x00, 0x00};
 903         const int ErrorDpcCounterInitialize = 200;
 904
 905         ioaddr[0] = dev->base_addr;
 906         /* mem_start holds the second I/O address */
 907         ioaddr[1] = dev->mem_start;
 908         name = dev->name;
 909
 910         sb1000_wait_for_ready_clear(ioaddr, name);
 911         sb1000_send_command(ioaddr, name, Command0);
 912         sb1000_wait_for_ready(ioaddr, name);
 913         sb1000_read_status(ioaddr, st);
 914         if (st[1] & 0x10)
 915                 lp->rx_error_dpc_count = ErrorDpcCounterInitialize;
 916         return;
 917 }
 918
 919
 920 /*
 921  * Linux interface functions
 922  */
 923 static int
 924 sb1000_open(struct net_device *dev)
 925 {
 926         char *name;
 927         int ioaddr[2], status;
 928         struct sb1000_private *lp = netdev_priv(dev);
 929         const unsigned short FirmwareVersion[] = {0x01, 0x01};
 930
 931         ioaddr[0] = dev->base_addr;
 932         /* mem_start holds the second I/O address */
 933         ioaddr[1] = dev->mem_start;
 934         name = dev->name;
 935
 936         /* initialize sb1000 */
 937         if ((status = sb1000_reset(ioaddr, name)))
 938                 return status;
 939         ssleep(1);
 940         if ((status = sb1000_check_CRC(ioaddr, name)))
 941                 return status;
 942
 943         /* initialize private data before board can catch interrupts */
 944         lp->rx_skb[0] = NULL;
 945         lp->rx_skb[1] = NULL;
 946         lp->rx_skb[2] = NULL;
 947         lp->rx_skb[3] = NULL;
 948         lp->rx_dlen[0] = 0;
 949         lp->rx_dlen[1] = 0;
 950         lp->rx_dlen[2] = 0;
 951         lp->rx_dlen[3] = 0;
 952         lp->rx_frames = 0;
 953         lp->rx_error_count = 0;
 954         lp->rx_error_dpc_count = 0;
 955         lp->rx_session_id[0] = 0x50;
 956         lp->rx_session_id[0] = 0x48;
 957         lp->rx_session_id[0] = 0x44;
 958         lp->rx_session_id[0] = 0x42;
 959         lp->rx_frame_id[0] = 0;
 960         lp->rx_frame_id[1] = 0;
 961         lp->rx_frame_id[2] = 0;
 962         lp->rx_frame_id[3] = 0;
 963         if (request_irq(dev->irq, &sb1000_interrupt, 0, "sb1000", dev)) {
 964                 return -EAGAIN;
 965         }
 966
 967         if (sb1000_debug > 2)
 968                 printk(KERN_DEBUG "%s: Opening, IRQ %d\n", name, dev->irq);
 969
 970         /* Activate board and check firmware version */
 971         udelay(1000);
 972         if ((status = sb1000_activate(ioaddr, name)))
 973                 return status;
 974         udelay(0);
 975         if ((status = sb1000_get_firmware_version(ioaddr, name, version, 0)))
 976                 return status;
 977         if (version[0] != FirmwareVersion[0] || version[1] != FirmwareVersion[1])
 978                 printk(KERN_WARNING "%s: found firmware version %x.%02x "
 979                         "(should be %x.%02x)\n", name, version[0], version[1],
 980                         FirmwareVersion[0], FirmwareVersion[1]);
 981
 982
 983         netif_start_queue(dev);
 984         return 0;                                       /* Always succeed */
 985 }
 986
 987 static int sb1000_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 988 {
 989         char* name;
 990         unsigned char version[2];
 991         short PID[4];
 992         int ioaddr[2], status, frequency;
 993         unsigned int stats[5];
 994         struct sb1000_private *lp = netdev_priv(dev);
 995
 996         if (!(dev && dev->flags & IFF_UP))
 997                 return -ENODEV;
 998
 999         ioaddr[0] = dev->base_addr;
1000         /* mem_start holds the second I/O address */
1001         ioaddr[1] = dev->mem_start;
1002         name = dev->name;
1003
1004         switch (cmd) {
1005         case SIOCGCMSTATS:              /* get statistics */
1006                 stats[0] = lp->stats.rx_bytes;
1007                 stats[1] = lp->rx_frames;
1008                 stats[2] = lp->stats.rx_packets;
1009                 stats[3] = lp->stats.rx_errors;
1010                 stats[4] = lp->stats.rx_dropped;
1011                 if(copy_to_user(ifr->ifr_data, stats, sizeof(stats)))
1012                         return -EFAULT;
1013                 status = 0;
1014                 break;
1015
1016         case SIOCGCMFIRMWARE:           /* get firmware version */
1017                 if ((status = sb1000_get_firmware_version(ioaddr, name, version, 1)))
1018                         return status;
1019                 if(copy_to_user(ifr->ifr_data, version, sizeof(version)))
1020                         return -EFAULT;
1021                 break;
1022
1023         case SIOCGCMFREQUENCY:          /* get frequency */
1024                 if ((status = sb1000_get_frequency(ioaddr, name, &frequency)))
1025                         return status;
1026                 if(put_user(frequency, (int __user *) ifr->ifr_data))
1027                         return -EFAULT;
1028                 break;
1029
1030         case SIOCSCMFREQUENCY:          /* set frequency */
1031                 if (!capable(CAP_NET_ADMIN))
1032                         return -EPERM;
1033                 if(get_user(frequency, (int __user *) ifr->ifr_data))
1034                         return -EFAULT;
1035                 if ((status = sb1000_set_frequency(ioaddr, name, frequency)))
1036                         return status;
1037                 break;
1038
1039         case SIOCGCMPIDS:                       /* get PIDs */
1040                 if ((status = sb1000_get_PIDs(ioaddr, name, PID)))
1041                         return status;
1042                 if(copy_to_user(ifr->ifr_data, PID, sizeof(PID)))
1043                         return -EFAULT;
1044                 break;
1045
1046         case SIOCSCMPIDS:                       /* set PIDs */
1047                 if (!capable(CAP_NET_ADMIN))
1048                         return -EPERM;
1049                 if(copy_from_user(PID, ifr->ifr_data, sizeof(PID)))
1050                         return -EFAULT;
1051                 if ((status = sb1000_set_PIDs(ioaddr, name, PID)))
1052                         return status;
1053                 /* set session_id, frame_id and pkt_type too */
1054                 lp->rx_session_id[0] = 0x50 | (PID[0] & 0x0f);
1055                 lp->rx_session_id[1] = 0x48;
1056                 lp->rx_session_id[2] = 0x44;
1057                 lp->rx_session_id[3] = 0x42;
1058                 lp->rx_frame_id[0] = 0;
1059                 lp->rx_frame_id[1] = 0;
1060                 lp->rx_frame_id[2] = 0;
1061                 lp->rx_frame_id[3] = 0;
1062                 break;
1063
1064         default:
1065                 status = -EINVAL;
1066                 break;
1067         }
1068         return status;
1069 }
1070
1071 /* transmit function: do nothing since SB1000 can't send anything out */
1072 static int
1073 sb1000_start_xmit(struct sk_buff *skb, struct net_device *dev)
1074 {
1075         printk(KERN_WARNING "%s: trying to transmit!!!\n", dev->name);
1076         /* sb1000 can't xmit datagrams */
1077         dev_kfree_skb(skb);
1078         return 0;
1079 }
1080
1081 /* SB1000 interrupt handler. */
1082 static irqreturn_t sb1000_interrupt(int irq, void *dev_id)
1083 {
1084         char *name;
1085         unsigned char st;
1086         int ioaddr[2];
1087         struct net_device *dev = dev_id;
1088         struct sb1000_private *lp = netdev_priv(dev);
1089
1090         const unsigned char Command0[6] = {0x80, 0x2c, 0x00, 0x00, 0x00, 0x00};
1091         const unsigned char Command1[6] = {0x80, 0x2e, 0x00, 0x00, 0x00, 0x00};
1092         const int MaxRxErrorCount = 6;
1093
1094         ioaddr[0] = dev->base_addr;
1095         /* mem_start holds the second I/O address */
1096         ioaddr[1] = dev->mem_start;
1097         name = dev->name;
1098
1099         /* is it a good interrupt? */
1100         st = inb(ioaddr[1] + 6);
1101         if (!(st & 0x08 && st & 0x20)) {
1102                 return IRQ_NONE;
1103         }
1104
1105         if (sb1000_debug > 3)
1106                 printk(KERN_DEBUG "%s: entering interrupt\n", dev->name);
1107
1108         st = inb(ioaddr[0] + 7);
1109         if (sb1000_rx(dev))
1110                 lp->rx_error_count++;
1111 #ifdef SB1000_DELAY
1112         udelay(SB1000_DELAY);
1113 #endif /* SB1000_DELAY */
1114         sb1000_issue_read_command(ioaddr, name);
1115         if (st & 0x01) {
1116                 sb1000_error_dpc(dev);
1117                 sb1000_issue_read_command(ioaddr, name);
1118         }
1119         if (lp->rx_error_dpc_count && !(--lp->rx_error_dpc_count)) {
1120                 sb1000_wait_for_ready_clear(ioaddr, name);
1121                 sb1000_send_command(ioaddr, name, Command0);
1122                 sb1000_wait_for_ready(ioaddr, name);
1123                 sb1000_issue_read_command(ioaddr, name);
1124         }
1125         if (lp->rx_error_count >= MaxRxErrorCount) {
1126                 sb1000_wait_for_ready_clear(ioaddr, name);
1127                 sb1000_send_command(ioaddr, name, Command1);
1128                 sb1000_wait_for_ready(ioaddr, name);
1129                 sb1000_issue_read_command(ioaddr, name);
1130                 lp->rx_error_count = 0;
1131         }
1132
1133         return IRQ_HANDLED;
1134 }
1135
1136 static struct net_device_stats *sb1000_stats(struct net_device *dev)
1137 {
1138         struct sb1000_private *lp = netdev_priv(dev);
1139         return &lp->stats;
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);