drivers/net/sb1000.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* sb1000.c: A General Instruments SB1000 driver for linux. */
   3 /*
   4         Written 1998 by Franco Venturi.
   5
   6         Copyright 1998 by Franco Venturi.
   7         Copyright 1994,1995 by Donald Becker.
   8         Copyright 1993 United States Government as represented by the
   9         Director, National Security Agency.
  10
  11         This driver is for the General Instruments SB1000 (internal SURFboard)
  12
  13         The author may be reached as fventuri@mediaone.net
  14
  15
  16         Changes:
  17
  18         981115 Steven Hirsch <shirsch@adelphia.net>
  19
  20         Linus changed the timer interface.  Should work on all recent
  21         development kernels.
  22
  23         980608 Steven Hirsch <shirsch@adelphia.net>
  24
  25         Small changes to make it work with 2.1.x kernels. Hopefully,
  26         nothing major will change before official release of Linux 2.2.
  27
  28         Merged with 2.2 - Alan Cox
  29 */
  30
  31 static char version[] = "sb1000.c:v1.1.2 6/01/98 (fventuri@mediaone.net)\n";
  32
  33 #include <linux/module.h>
  34 #include <linux/kernel.h>
  35 #include <linux/sched.h>
  36 #include <linux/string.h>
  37 #include <linux/interrupt.h>
  38 #include <linux/errno.h>
  39 #include <linux/if_cablemodem.h> /* for SIOGCM/SIOSCM stuff */
  40 #include <linux/in.h>
  41 #include <linux/ioport.h>
  42 #include <linux/netdevice.h>
  43 #include <linux/if_arp.h>
  44 #include <linux/skbuff.h>
  45 #include <linux/delay.h>        /* for udelay() */
  46 #include <linux/etherdevice.h>
  47 #include <linux/pnp.h>
  48 #include <linux/init.h>
  49 #include <linux/bitops.h>
  50 #include <linux/gfp.h>
  51
  52 #include <asm/io.h>
  53 #include <asm/processor.h>
  54 #include <linux/uaccess.h>
  55
  56 #ifdef SB1000_DEBUG
  57 static int sb1000_debug = SB1000_DEBUG;
  58 #else
  59 static const int sb1000_debug = 1;
  60 #endif
  61
  62 static const int SB1000_IO_EXTENT = 8;
  63 /* SB1000 Maximum Receive Unit */
  64 static const int SB1000_MRU = 1500; /* octects */
  65
  66 #define NPIDS 4
  67 struct sb1000_private {
  68         struct sk_buff *rx_skb[NPIDS];
  69         short rx_dlen[NPIDS];
  70         unsigned int rx_frames;
  71         short rx_error_count;
  72         short rx_error_dpc_count;
  73         unsigned char rx_session_id[NPIDS];
  74         unsigned char rx_frame_id[NPIDS];
  75         unsigned char rx_pkt_type[NPIDS];
  76 };
  77
  78 /* prototypes for Linux interface */
  79 extern int sb1000_probe(struct net_device *dev);
  80 static int sb1000_open(struct net_device *dev);
  81 static int sb1000_dev_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd);
  82 static netdev_tx_t sb1000_start_xmit(struct sk_buff *skb,
  83                                      struct net_device *dev);
  84 static irqreturn_t sb1000_interrupt(int irq, void *dev_id);
  85 static int sb1000_close(struct net_device *dev);
  86
  87
  88 /* SB1000 hardware routines to be used during open/configuration phases */
  89 static int card_wait_for_busy_clear(const int ioaddr[],
  90         const char* name);
  91 static int card_wait_for_ready(const int ioaddr[], const char* name,
  92         unsigned char in[]);
  93 static int card_send_command(const int ioaddr[], const char* name,
  94         const unsigned char out[], unsigned char in[]);
  95
  96 /* SB1000 hardware routines to be used during frame rx interrupt */
  97 static int sb1000_wait_for_ready(const int ioaddr[], const char* name);
  98 static int sb1000_wait_for_ready_clear(const int ioaddr[],
  99         const char* name);
 100 static void sb1000_send_command(const int ioaddr[], const char* name,
 101         const unsigned char out[]);
 102 static void sb1000_read_status(const int ioaddr[], unsigned char in[]);
 103 static void sb1000_issue_read_command(const int ioaddr[],
 104         const char* name);
 105
 106 /* SB1000 commands for open/configuration */
 107 static int sb1000_reset(const int ioaddr[], const char* name);
 108 static int sb1000_check_CRC(const int ioaddr[], const char* name);
 109 static inline int sb1000_start_get_set_command(const int ioaddr[],
 110         const char* name);
 111 static int sb1000_end_get_set_command(const int ioaddr[],
 112         const char* name);
 113 static int sb1000_activate(const int ioaddr[], const char* name);
 114 static int sb1000_get_firmware_version(const int ioaddr[],
 115         const char* name, unsigned char version[], int do_end);
 116 static int sb1000_get_frequency(const int ioaddr[], const char* name,
 117         int* frequency);
 118 static int sb1000_set_frequency(const int ioaddr[], const char* name,
 119         int frequency);
 120 static int sb1000_get_PIDs(const int ioaddr[], const char* name,
 121         short PID[]);
 122 static int sb1000_set_PIDs(const int ioaddr[], const char* name,
 123         const short PID[]);
 124
 125 /* SB1000 commands for frame rx interrupt */
 126 static int sb1000_rx(struct net_device *dev);
 127 static void sb1000_error_dpc(struct net_device *dev);
 128
 129 static const struct pnp_device_id sb1000_pnp_ids[] = {
 130         { "GIC1000", 0 },
 131         { "", 0 }
 132 };
 133 MODULE_DEVICE_TABLE(pnp, sb1000_pnp_ids);
 134
 135 static const struct net_device_ops sb1000_netdev_ops = {
 136         .ndo_open               = sb1000_open,
 137         .ndo_start_xmit         = sb1000_start_xmit,
 138         .ndo_do_ioctl           = sb1000_dev_ioctl,
 139         .ndo_stop               = sb1000_close,
 140         .ndo_set_mac_address    = eth_mac_addr,
 141         .ndo_validate_addr      = eth_validate_addr,
 142 };
 143
 144 static int
 145 sb1000_probe_one(struct pnp_dev *pdev, const struct pnp_device_id *id)
 146 {
 147         struct net_device *dev;
 148         unsigned short ioaddr[2], irq;
 149         unsigned int serial_number;
 150         int error = -ENODEV;
 151
 152         if (pnp_device_attach(pdev) < 0)
 153                 return -ENODEV;
 154         if (pnp_activate_dev(pdev) < 0)
 155                 goto out_detach;
 156
 157         if (!pnp_port_valid(pdev, 0) || !pnp_port_valid(pdev, 1))
 158                 goto out_disable;
 159         if (!pnp_irq_valid(pdev, 0))
 160                 goto out_disable;
 161
 162         serial_number = pdev->card->serial;
 163
 164         ioaddr[0] = pnp_port_start(pdev, 0);
 165         ioaddr[1] = pnp_port_start(pdev, 0);
 166
 167         irq = pnp_irq(pdev, 0);
 168
 169         if (!request_region(ioaddr[0], 16, "sb1000"))
 170                 goto out_disable;
 171         if (!request_region(ioaddr[1], 16, "sb1000"))
 172                 goto out_release_region0;
 173
 174         dev = alloc_etherdev(sizeof(struct sb1000_private));
 175         if (!dev) {
 176                 error = -ENOMEM;
 177                 goto out_release_regions;
 178         }
 179
 180
 181         dev->base_addr = ioaddr[0];
 182         /* mem_start holds the second I/O address */
 183         dev->mem_start = ioaddr[1];
 184         dev->irq = irq;
 185
 186         if (sb1000_debug > 0)
 187                 printk(KERN_NOTICE "%s: sb1000 at (%#3.3lx,%#3.3lx), "
 188                         "S/N %#8.8x, IRQ %d.\n", dev->name, dev->base_addr,
 189                         dev->mem_start, serial_number, dev->irq);
 190
 191         /*
 192          * The SB1000 is an rx-only cable modem device.  The uplink is a modem
 193          * and we do not want to arp on it.
 194          */
 195         dev->flags = IFF_POINTOPOINT|IFF_NOARP;
 196
 197         SET_NETDEV_DEV(dev, &pdev->dev);
 198
 199         if (sb1000_debug > 0)
 200                 printk(KERN_NOTICE "%s", version);
 201
 202         dev->netdev_ops = &sb1000_netdev_ops;
 203
 204         /* hardware address is 0:0:serial_number */
 205         dev->dev_addr[2]        = serial_number >> 24 & 0xff;
 206         dev->dev_addr[3]        = serial_number >> 16 & 0xff;
 207         dev->dev_addr[4]        = serial_number >>  8 & 0xff;
 208         dev->dev_addr[5]        = serial_number >>  0 & 0xff;
 209
 210         pnp_set_drvdata(pdev, dev);
 211
 212         error = register_netdev(dev);
 213         if (error)
 214                 goto out_free_netdev;
 215         return 0;
 216
 217  out_free_netdev:
 218         free_netdev(dev);
 219  out_release_regions:
 220         release_region(ioaddr[1], 16);
 221  out_release_region0:
 222         release_region(ioaddr[0], 16);
 223  out_disable:
 224         pnp_disable_dev(pdev);
 225  out_detach:
 226         pnp_device_detach(pdev);
 227         return error;
 228 }
 229
 230 static void
 231 sb1000_remove_one(struct pnp_dev *pdev)
 232 {
 233         struct net_device *dev = pnp_get_drvdata(pdev);
 234
 235         unregister_netdev(dev);
 236         release_region(dev->base_addr, 16);
 237         release_region(dev->mem_start, 16);
 238         free_netdev(dev);
 239 }
 240
 241 static struct pnp_driver sb1000_driver = {
 242         .name           = "sb1000",
 243         .id_table       = sb1000_pnp_ids,
 244         .probe          = sb1000_probe_one,
 245         .remove         = sb1000_remove_one,
 246 };
 247
 248
 249 /*
 250  * SB1000 hardware routines to be used during open/configuration phases
 251  */
 252
 253 static const int TimeOutJiffies = (875 * HZ) / 100;
 254
 255 /* Card Wait For Busy Clear (cannot be used during an interrupt) */
 256 static int
 257 card_wait_for_busy_clear(const int ioaddr[], const char* name)
 258 {
 259         unsigned char a;
 260         unsigned long timeout;
 261
 262         a = inb(ioaddr[0] + 7);
 263         timeout = jiffies + TimeOutJiffies;
 264         while (a & 0x80 || a & 0x40) {
 265                 /* a little sleep */
 266                 yield();
 267
 268                 a = inb(ioaddr[0] + 7);
 269                 if (time_after_eq(jiffies, timeout)) {
 270                         printk(KERN_WARNING "%s: card_wait_for_busy_clear timeout\n",
 271                                 name);
 272                         return -ETIME;
 273                 }
 274         }
 275
 276         return 0;
 277 }
 278
 279 /* Card Wait For Ready (cannot be used during an interrupt) */
 280 static int
 281 card_wait_for_ready(const int ioaddr[], const char* name, unsigned char in[])
 282 {
 283         unsigned char a;
 284         unsigned long timeout;
 285
 286         a = inb(ioaddr[1] + 6);
 287         timeout = jiffies + TimeOutJiffies;
 288         while (a & 0x80 || !(a & 0x40)) {
 289                 /* a little sleep */
 290                 yield();
 291
 292                 a = inb(ioaddr[1] + 6);
 293                 if (time_after_eq(jiffies, timeout)) {
 294                         printk(KERN_WARNING "%s: card_wait_for_ready timeout\n",
 295                                 name);
 296                         return -ETIME;
 297                 }
 298         }
 299
 300         in[1] = inb(ioaddr[0] + 1);
 301         in[2] = inb(ioaddr[0] + 2);
 302         in[3] = inb(ioaddr[0] + 3);
 303         in[4] = inb(ioaddr[0] + 4);
 304         in[0] = inb(ioaddr[0] + 5);
 305         in[6] = inb(ioaddr[0] + 6);
 306         in[5] = inb(ioaddr[1] + 6);
 307         return 0;
 308 }
 309
 310 /* Card Send Command (cannot be used during an interrupt) */
 311 static int
 312 card_send_command(const int ioaddr[], const char* name,
 313         const unsigned char out[], unsigned char in[])
 314 {
 315         int status;
 316
 317         if ((status = card_wait_for_busy_clear(ioaddr, name)))
 318                 return status;
 319         outb(0xa0, ioaddr[0] + 6);
 320         outb(out[2], ioaddr[0] + 1);
 321         outb(out[3], ioaddr[0] + 2);
 322         outb(out[4], ioaddr[0] + 3);
 323         outb(out[5], ioaddr[0] + 4);
 324         outb(out[1], ioaddr[0] + 5);
 325         outb(0xa0, ioaddr[0] + 6);
 326         outb(out[0], ioaddr[0] + 7);
 327         if (out[0] != 0x20 && out[0] != 0x30) {
 328                 if ((status = card_wait_for_ready(ioaddr, name, in)))
 329                         return status;
 330                 inb(ioaddr[0] + 7);
 331                 if (sb1000_debug > 3)
 332                         printk(KERN_DEBUG "%s: card_send_command "
 333                                 "out: %02x%02x%02x%02x%02x%02x  "
 334                                 "in: %02x%02x%02x%02x%02x%02x%02x\n", name,
 335                                 out[0], out[1], out[2], out[3], out[4], out[5],
 336                                 in[0], in[1], in[2], in[3], in[4], in[5], in[6]);
 337         } else {
 338                 if (sb1000_debug > 3)
 339                         printk(KERN_DEBUG "%s: card_send_command "
 340                                 "out: %02x%02x%02x%02x%02x%02x\n", name,
 341                                 out[0], out[1], out[2], out[3], out[4], out[5]);
 342         }
 343
 344         if (out[1] != 0x1b) {
 345                 if (out[0] >= 0x80 && in[0] != (out[1] | 0x80))
 346                         return -EIO;
 347         }
 348         return 0;
 349 }
 350
 351
 352 /*
 353  * SB1000 hardware routines to be used during frame rx interrupt
 354  */
 355 static const int Sb1000TimeOutJiffies = 7 * HZ;
 356
 357 /* Card Wait For Ready (to be used during frame rx) */
 358 static int
 359 sb1000_wait_for_ready(const int ioaddr[], const char* name)
 360 {
 361         unsigned long timeout;
 362
 363         timeout = jiffies + Sb1000TimeOutJiffies;
 364         while (inb(ioaddr[1] + 6) & 0x80) {
 365                 if (time_after_eq(jiffies, timeout)) {
 366                         printk(KERN_WARNING "%s: sb1000_wait_for_ready timeout\n",
 367                                 name);
 368                         return -ETIME;
 369                 }
 370         }
 371         timeout = jiffies + Sb1000TimeOutJiffies;
 372         while (!(inb(ioaddr[1] + 6) & 0x40)) {
 373                 if (time_after_eq(jiffies, timeout)) {
 374                         printk(KERN_WARNING "%s: sb1000_wait_for_ready timeout\n",
 375                                 name);
 376                         return -ETIME;
 377                 }
 378         }
 379         inb(ioaddr[0] + 7);
 380         return 0;
 381 }
 382
 383 /* Card Wait For Ready Clear (to be used during frame rx) */
 384 static int
 385 sb1000_wait_for_ready_clear(const int ioaddr[], const char* name)
 386 {
 387         unsigned long timeout;
 388
 389         timeout = jiffies + Sb1000TimeOutJiffies;
 390         while (inb(ioaddr[1] + 6) & 0x80) {
 391                 if (time_after_eq(jiffies, timeout)) {
 392                         printk(KERN_WARNING "%s: sb1000_wait_for_ready_clear timeout\n",
 393                                 name);
 394                         return -ETIME;
 395                 }
 396         }
 397         timeout = jiffies + Sb1000TimeOutJiffies;
 398         while (inb(ioaddr[1] + 6) & 0x40) {
 399                 if (time_after_eq(jiffies, timeout)) {
 400                         printk(KERN_WARNING "%s: sb1000_wait_for_ready_clear timeout\n",
 401                                 name);
 402                         return -ETIME;
 403                 }
 404         }
 405         return 0;
 406 }
 407
 408 /* Card Send Command (to be used during frame rx) */
 409 static void
 410 sb1000_send_command(const int ioaddr[], const char* name,
 411         const unsigned char out[])
 412 {
 413         outb(out[2], ioaddr[0] + 1);
 414         outb(out[3], ioaddr[0] + 2);
 415         outb(out[4], ioaddr[0] + 3);
 416         outb(out[5], ioaddr[0] + 4);
 417         outb(out[1], ioaddr[0] + 5);
 418         outb(out[0], ioaddr[0] + 7);
 419         if (sb1000_debug > 3)
 420                 printk(KERN_DEBUG "%s: sb1000_send_command out: %02x%02x%02x%02x"
 421                         "%02x%02x\n", name, out[0], out[1], out[2], out[3], out[4], out[5]);
 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 }
 434
 435 /* Issue Read Command (to be used during frame rx) */
 436 static void
 437 sb1000_issue_read_command(const int ioaddr[], const char* name)
 438 {
 439         static const unsigned char Command0[6] = {0x20, 0x00, 0x00, 0x01, 0x00, 0x00};
 440
 441         sb1000_wait_for_ready_clear(ioaddr, name);
 442         outb(0xa0, ioaddr[0] + 6);
 443         sb1000_send_command(ioaddr, name, Command0);
 444 }
 445
 446
 447 /*
 448  * SB1000 commands for open/configuration
 449  */
 450 /* reset SB1000 card */
 451 static int
 452 sb1000_reset(const int ioaddr[], const char* name)
 453 {
 454         static const unsigned char Command0[6] = {0x80, 0x16, 0x00, 0x00, 0x00, 0x00};
 455
 456         unsigned char st[7];
 457         int port, status;
 458
 459         port = ioaddr[1] + 6;
 460         outb(0x4, port);
 461         inb(port);
 462         udelay(1000);
 463         outb(0x0, port);
 464         inb(port);
 465         ssleep(1);
 466         outb(0x4, port);
 467         inb(port);
 468         udelay(1000);
 469         outb(0x0, port);
 470         inb(port);
 471         udelay(0);
 472
 473         if ((status = card_send_command(ioaddr, name, Command0, st)))
 474                 return status;
 475         if (st[3] != 0xf0)
 476                 return -EIO;
 477         return 0;
 478 }
 479
 480 /* check SB1000 firmware CRC */
 481 static int
 482 sb1000_check_CRC(const int ioaddr[], const char* name)
 483 {
 484         static const unsigned char Command0[6] = {0x80, 0x1f, 0x00, 0x00, 0x00, 0x00};
 485
 486         unsigned char st[7];
 487         int status;
 488
 489         /* check CRC */
 490         if ((status = card_send_command(ioaddr, name, Command0, st)))
 491                 return status;
 492         if (st[1] != st[3] || st[2] != st[4])
 493                 return -EIO;
 494         return 0;
 495 }
 496
 497 static inline int
 498 sb1000_start_get_set_command(const int ioaddr[], const char* name)
 499 {
 500         static const unsigned char Command0[6] = {0x80, 0x1b, 0x00, 0x00, 0x00, 0x00};
 501
 502         unsigned char st[7];
 503
 504         return card_send_command(ioaddr, name, Command0, st);
 505 }
 506
 507 static int
 508 sb1000_end_get_set_command(const int ioaddr[], const char* name)
 509 {
 510         static const unsigned char Command0[6] = {0x80, 0x1b, 0x02, 0x00, 0x00, 0x00};
 511         static const unsigned char Command1[6] = {0x20, 0x00, 0x00, 0x00, 0x00, 0x00};
 512
 513         unsigned char st[7];
 514         int status;
 515
 516         if ((status = card_send_command(ioaddr, name, Command0, st)))
 517                 return status;
 518         return card_send_command(ioaddr, name, Command1, st);
 519 }
 520
 521 static int
 522 sb1000_activate(const int ioaddr[], const char* name)
 523 {
 524         static const unsigned char Command0[6] = {0x80, 0x11, 0x00, 0x00, 0x00, 0x00};
 525         static const unsigned char Command1[6] = {0x80, 0x16, 0x00, 0x00, 0x00, 0x00};
 526
 527         unsigned char st[7];
 528         int status;
 529
 530         ssleep(1);
 531         status = card_send_command(ioaddr, name, Command0, st);
 532         if (status)
 533                 return status;
 534         status = card_send_command(ioaddr, name, Command1, st);
 535         if (status)
 536                 return status;
 537         if (st[3] != 0xf1) {
 538                 status = sb1000_start_get_set_command(ioaddr, name);
 539                 if (status)
 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 }
 729
 730 /*
 731  * SB1000 commands for frame rx interrupt
 732  */
 733 /* receive a single frame and assemble datagram
 734  * (this is the heart of the interrupt routine)
 735  */
 736 static int
 737 sb1000_rx(struct net_device *dev)
 738 {
 739
 740 #define FRAMESIZE 184
 741         unsigned char st[2], buffer[FRAMESIZE], session_id, frame_id;
 742         short dlen;
 743         int ioaddr, ns;
 744         unsigned int skbsize;
 745         struct sk_buff *skb;
 746         struct sb1000_private *lp = netdev_priv(dev);
 747         struct net_device_stats *stats = &dev->stats;
 748
 749         /* SB1000 frame constants */
 750         const int FrameSize = FRAMESIZE;
 751         const int NewDatagramHeaderSkip = 8;
 752         const int NewDatagramHeaderSize = NewDatagramHeaderSkip + 18;
 753         const int NewDatagramDataSize = FrameSize - NewDatagramHeaderSize;
 754         const int ContDatagramHeaderSkip = 7;
 755         const int ContDatagramHeaderSize = ContDatagramHeaderSkip + 1;
 756         const int ContDatagramDataSize = FrameSize - ContDatagramHeaderSize;
 757         const int TrailerSize = 4;
 758
 759         ioaddr = dev->base_addr;
 760
 761         insw(ioaddr, (unsigned short*) st, 1);
 762 #ifdef XXXDEBUG
 763 printk("cm0: received: %02x %02x\n", st[0], st[1]);
 764 #endif /* XXXDEBUG */
 765         lp->rx_frames++;
 766
 767         /* decide if it is a good or bad frame */
 768         for (ns = 0; ns < NPIDS; ns++) {
 769                 session_id = lp->rx_session_id[ns];
 770                 frame_id = lp->rx_frame_id[ns];
 771                 if (st[0] == session_id) {
 772                         if (st[1] == frame_id || (!frame_id && (st[1] & 0xf0) == 0x30)) {
 773                                 goto good_frame;
 774                         } else if ((st[1] & 0xf0) == 0x30 && (st[0] & 0x40)) {
 775                                 goto skipped_frame;
 776                         } else {
 777                                 goto bad_frame;
 778                         }
 779                 } else if (st[0] == (session_id | 0x40)) {
 780                         if ((st[1] & 0xf0) == 0x30) {
 781                                 goto skipped_frame;
 782                         } else {
 783                                 goto bad_frame;
 784                         }
 785                 }
 786         }
 787         goto bad_frame;
 788
 789 skipped_frame:
 790         stats->rx_frame_errors++;
 791         skb = lp->rx_skb[ns];
 792         if (sb1000_debug > 1)
 793                 printk(KERN_WARNING "%s: missing frame(s): got %02x %02x "
 794                         "expecting %02x %02x\n", dev->name, st[0], st[1],
 795                         skb ? session_id : session_id | 0x40, frame_id);
 796         if (skb) {
 797                 dev_kfree_skb(skb);
 798                 skb = NULL;
 799         }
 800
 801 good_frame:
 802         lp->rx_frame_id[ns] = 0x30 | ((st[1] + 1) & 0x0f);
 803         /* new datagram */
 804         if (st[0] & 0x40) {
 805                 /* get data length */
 806                 insw(ioaddr, buffer, NewDatagramHeaderSize / 2);
 807 #ifdef XXXDEBUG
 808 printk("cm0: IP identification: %02x%02x  fragment offset: %02x%02x\n", buffer[30], buffer[31], buffer[32], buffer[33]);
 809 #endif /* XXXDEBUG */
 810                 if (buffer[0] != NewDatagramHeaderSkip) {
 811                         if (sb1000_debug > 1)
 812                                 printk(KERN_WARNING "%s: new datagram header skip error: "
 813                                         "got %02x expecting %02x\n", dev->name, buffer[0],
 814                                         NewDatagramHeaderSkip);
 815                         stats->rx_length_errors++;
 816                         insw(ioaddr, buffer, NewDatagramDataSize / 2);
 817                         goto bad_frame_next;
 818                 }
 819                 dlen = ((buffer[NewDatagramHeaderSkip + 3] & 0x0f) << 8 |
 820                         buffer[NewDatagramHeaderSkip + 4]) - 17;
 821                 if (dlen > SB1000_MRU) {
 822                         if (sb1000_debug > 1)
 823                                 printk(KERN_WARNING "%s: datagram length (%d) greater "
 824                                         "than MRU (%d)\n", dev->name, dlen, SB1000_MRU);
 825                         stats->rx_length_errors++;
 826                         insw(ioaddr, buffer, NewDatagramDataSize / 2);
 827                         goto bad_frame_next;
 828                 }
 829                 lp->rx_dlen[ns] = dlen;
 830                 /* compute size to allocate for datagram */
 831                 skbsize = dlen + FrameSize;
 832                 if ((skb = alloc_skb(skbsize, GFP_ATOMIC)) == NULL) {
 833                         if (sb1000_debug > 1)
 834                                 printk(KERN_WARNING "%s: can't allocate %d bytes long "
 835                                         "skbuff\n", dev->name, skbsize);
 836                         stats->rx_dropped++;
 837                         insw(ioaddr, buffer, NewDatagramDataSize / 2);
 838                         goto dropped_frame;
 839                 }
 840                 skb->dev = dev;
 841                 skb_reset_mac_header(skb);
 842                 skb->protocol = (unsigned short) buffer[NewDatagramHeaderSkip + 16];
 843                 insw(ioaddr, skb_put(skb, NewDatagramDataSize),
 844                         NewDatagramDataSize / 2);
 845                 lp->rx_skb[ns] = skb;
 846         } else {
 847                 /* continuation of previous datagram */
 848                 insw(ioaddr, buffer, ContDatagramHeaderSize / 2);
 849                 if (buffer[0] != ContDatagramHeaderSkip) {
 850                         if (sb1000_debug > 1)
 851                                 printk(KERN_WARNING "%s: cont datagram header skip error: "
 852                                         "got %02x expecting %02x\n", dev->name, buffer[0],
 853                                         ContDatagramHeaderSkip);
 854                         stats->rx_length_errors++;
 855                         insw(ioaddr, buffer, ContDatagramDataSize / 2);
 856                         goto bad_frame_next;
 857                 }
 858                 skb = lp->rx_skb[ns];
 859                 insw(ioaddr, skb_put(skb, ContDatagramDataSize),
 860                         ContDatagramDataSize / 2);
 861                 dlen = lp->rx_dlen[ns];
 862         }
 863         if (skb->len < dlen + TrailerSize) {
 864                 lp->rx_session_id[ns] &= ~0x40;
 865                 return 0;
 866         }
 867
 868         /* datagram completed: send to upper level */
 869         skb_trim(skb, dlen);
 870         netif_rx(skb);
 871         stats->rx_bytes+=dlen;
 872         stats->rx_packets++;
 873         lp->rx_skb[ns] = NULL;
 874         lp->rx_session_id[ns] |= 0x40;
 875         return 0;
 876
 877 bad_frame:
 878         insw(ioaddr, buffer, FrameSize / 2);
 879         if (sb1000_debug > 1)
 880                 printk(KERN_WARNING "%s: frame error: got %02x %02x\n",
 881                         dev->name, st[0], st[1]);
 882         stats->rx_frame_errors++;
 883 bad_frame_next:
 884         if (sb1000_debug > 2)
 885                 sb1000_print_status_buffer(dev->name, st, buffer, FrameSize);
 886 dropped_frame:
 887         stats->rx_errors++;
 888         if (ns < NPIDS) {
 889                 if ((skb = lp->rx_skb[ns])) {
 890                         dev_kfree_skb(skb);
 891                         lp->rx_skb[ns] = NULL;
 892                 }
 893                 lp->rx_session_id[ns] |= 0x40;
 894         }
 895         return -1;
 896 }
 897
 898 static void
 899 sb1000_error_dpc(struct net_device *dev)
 900 {
 901         static const unsigned char Command0[6] = {0x80, 0x26, 0x00, 0x00, 0x00, 0x00};
 902
 903         char *name;
 904         unsigned char st[5];
 905         int ioaddr[2];
 906         struct sb1000_private *lp = netdev_priv(dev);
 907         const int ErrorDpcCounterInitialize = 200;
 908
 909         ioaddr[0] = dev->base_addr;
 910         /* mem_start holds the second I/O address */
 911         ioaddr[1] = dev->mem_start;
 912         name = dev->name;
 913
 914         sb1000_wait_for_ready_clear(ioaddr, name);
 915         sb1000_send_command(ioaddr, name, Command0);
 916         sb1000_wait_for_ready(ioaddr, name);
 917         sb1000_read_status(ioaddr, st);
 918         if (st[1] & 0x10)
 919                 lp->rx_error_dpc_count = ErrorDpcCounterInitialize;
 920 }
 921
 922
 923 /*
 924  * Linux interface functions
 925  */
 926 static int
 927 sb1000_open(struct net_device *dev)
 928 {
 929         char *name;
 930         int ioaddr[2], status;
 931         struct sb1000_private *lp = netdev_priv(dev);
 932         const unsigned short FirmwareVersion[] = {0x01, 0x01};
 933
 934         ioaddr[0] = dev->base_addr;
 935         /* mem_start holds the second I/O address */
 936         ioaddr[1] = dev->mem_start;
 937         name = dev->name;
 938
 939         /* initialize sb1000 */
 940         if ((status = sb1000_reset(ioaddr, name)))
 941                 return status;
 942         ssleep(1);
 943         if ((status = sb1000_check_CRC(ioaddr, name)))
 944                 return status;
 945
 946         /* initialize private data before board can catch interrupts */
 947         lp->rx_skb[0] = NULL;
 948         lp->rx_skb[1] = NULL;
 949         lp->rx_skb[2] = NULL;
 950         lp->rx_skb[3] = NULL;
 951         lp->rx_dlen[0] = 0;
 952         lp->rx_dlen[1] = 0;
 953         lp->rx_dlen[2] = 0;
 954         lp->rx_dlen[3] = 0;
 955         lp->rx_frames = 0;
 956         lp->rx_error_count = 0;
 957         lp->rx_error_dpc_count = 0;
 958         lp->rx_session_id[0] = 0x50;
 959         lp->rx_session_id[1] = 0x48;
 960         lp->rx_session_id[2] = 0x44;
 961         lp->rx_session_id[3] = 0x42;
 962         lp->rx_frame_id[0] = 0;
 963         lp->rx_frame_id[1] = 0;
 964         lp->rx_frame_id[2] = 0;
 965         lp->rx_frame_id[3] = 0;
 966         if (request_irq(dev->irq, sb1000_interrupt, 0, "sb1000", dev)) {
 967                 return -EAGAIN;
 968         }
 969
 970         if (sb1000_debug > 2)
 971                 printk(KERN_DEBUG "%s: Opening, IRQ %d\n", name, dev->irq);
 972
 973         /* Activate board and check firmware version */
 974         udelay(1000);
 975         if ((status = sb1000_activate(ioaddr, name)))
 976                 return status;
 977         udelay(0);
 978         if ((status = sb1000_get_firmware_version(ioaddr, name, version, 0)))
 979                 return status;
 980         if (version[0] != FirmwareVersion[0] || version[1] != FirmwareVersion[1])
 981                 printk(KERN_WARNING "%s: found firmware version %x.%02x "
 982                         "(should be %x.%02x)\n", name, version[0], version[1],
 983                         FirmwareVersion[0], FirmwareVersion[1]);
 984
 985
 986         netif_start_queue(dev);
 987         return 0;                                       /* Always succeed */
 988 }
 989
 990 static int sb1000_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 991 {
 992         char* name;
 993         unsigned char version[2];
 994         short PID[4];
 995         int ioaddr[2], status, frequency;
 996         unsigned int stats[5];
 997         struct sb1000_private *lp = netdev_priv(dev);
 998
 999         if (!(dev && dev->flags & IFF_UP))
1000                 return -ENODEV;
1001
1002         ioaddr[0] = dev->base_addr;
1003         /* mem_start holds the second I/O address */
1004         ioaddr[1] = dev->mem_start;
1005         name = dev->name;
1006
1007         switch (cmd) {
1008         case SIOCGCMSTATS:              /* get statistics */
1009                 stats[0] = dev->stats.rx_bytes;
1010                 stats[1] = lp->rx_frames;
1011                 stats[2] = dev->stats.rx_packets;
1012                 stats[3] = dev->stats.rx_errors;
1013                 stats[4] = dev->stats.rx_dropped;
1014                 if(copy_to_user(ifr->ifr_data, stats, sizeof(stats)))
1015                         return -EFAULT;
1016                 status = 0;
1017                 break;
1018
1019         case SIOCGCMFIRMWARE:           /* get firmware version */
1020                 if ((status = sb1000_get_firmware_version(ioaddr, name, version, 1)))
1021                         return status;
1022                 if(copy_to_user(ifr->ifr_data, version, sizeof(version)))
1023                         return -EFAULT;
1024                 break;
1025
1026         case SIOCGCMFREQUENCY:          /* get frequency */
1027                 if ((status = sb1000_get_frequency(ioaddr, name, &frequency)))
1028                         return status;
1029                 if(put_user(frequency, (int __user *) ifr->ifr_data))
1030                         return -EFAULT;
1031                 break;
1032
1033         case SIOCSCMFREQUENCY:          /* set frequency */
1034                 if (!capable(CAP_NET_ADMIN))
1035                         return -EPERM;
1036                 if(get_user(frequency, (int __user *) ifr->ifr_data))
1037                         return -EFAULT;
1038                 if ((status = sb1000_set_frequency(ioaddr, name, frequency)))
1039                         return status;
1040                 break;
1041
1042         case SIOCGCMPIDS:                       /* get PIDs */
1043                 if ((status = sb1000_get_PIDs(ioaddr, name, PID)))
1044                         return status;
1045                 if(copy_to_user(ifr->ifr_data, PID, sizeof(PID)))
1046                         return -EFAULT;
1047                 break;
1048
1049         case SIOCSCMPIDS:                       /* set PIDs */
1050                 if (!capable(CAP_NET_ADMIN))
1051                         return -EPERM;
1052                 if(copy_from_user(PID, ifr->ifr_data, sizeof(PID)))
1053                         return -EFAULT;
1054                 if ((status = sb1000_set_PIDs(ioaddr, name, PID)))
1055                         return status;
1056                 /* set session_id, frame_id and pkt_type too */
1057                 lp->rx_session_id[0] = 0x50 | (PID[0] & 0x0f);
1058                 lp->rx_session_id[1] = 0x48;
1059                 lp->rx_session_id[2] = 0x44;
1060                 lp->rx_session_id[3] = 0x42;
1061                 lp->rx_frame_id[0] = 0;
1062                 lp->rx_frame_id[1] = 0;
1063                 lp->rx_frame_id[2] = 0;
1064                 lp->rx_frame_id[3] = 0;
1065                 break;
1066
1067         default:
1068                 status = -EINVAL;
1069                 break;
1070         }
1071         return status;
1072 }
1073
1074 /* transmit function: do nothing since SB1000 can't send anything out */
1075 static netdev_tx_t
1076 sb1000_start_xmit(struct sk_buff *skb, struct net_device *dev)
1077 {
1078         printk(KERN_WARNING "%s: trying to transmit!!!\n", dev->name);
1079         /* sb1000 can't xmit datagrams */
1080         dev_kfree_skb(skb);
1081         return NETDEV_TX_OK;
1082 }
1083
1084 /* SB1000 interrupt handler. */
1085 static irqreturn_t sb1000_interrupt(int irq, void *dev_id)
1086 {
1087         static const unsigned char Command0[6] = {0x80, 0x2c, 0x00, 0x00, 0x00, 0x00};
1088         static const unsigned char Command1[6] = {0x80, 0x2e, 0x00, 0x00, 0x00, 0x00};
1089
1090         char *name;
1091         unsigned char st;
1092         int ioaddr[2];
1093         struct net_device *dev = dev_id;
1094         struct sb1000_private *lp = netdev_priv(dev);
1095
1096         const int MaxRxErrorCount = 6;
1097
1098         ioaddr[0] = dev->base_addr;
1099         /* mem_start holds the second I/O address */
1100         ioaddr[1] = dev->mem_start;
1101         name = dev->name;
1102
1103         /* is it a good interrupt? */
1104         st = inb(ioaddr[1] + 6);
1105         if (!(st & 0x08 && st & 0x20)) {
1106                 return IRQ_NONE;
1107         }
1108
1109         if (sb1000_debug > 3)
1110                 printk(KERN_DEBUG "%s: entering interrupt\n", dev->name);
1111
1112         st = inb(ioaddr[0] + 7);
1113         if (sb1000_rx(dev))
1114                 lp->rx_error_count++;
1115 #ifdef SB1000_DELAY
1116         udelay(SB1000_DELAY);
1117 #endif /* SB1000_DELAY */
1118         sb1000_issue_read_command(ioaddr, name);
1119         if (st & 0x01) {
1120                 sb1000_error_dpc(dev);
1121                 sb1000_issue_read_command(ioaddr, name);
1122         }
1123         if (lp->rx_error_dpc_count && !(--lp->rx_error_dpc_count)) {
1124                 sb1000_wait_for_ready_clear(ioaddr, name);
1125                 sb1000_send_command(ioaddr, name, Command0);
1126                 sb1000_wait_for_ready(ioaddr, name);
1127                 sb1000_issue_read_command(ioaddr, name);
1128         }
1129         if (lp->rx_error_count >= MaxRxErrorCount) {
1130                 sb1000_wait_for_ready_clear(ioaddr, name);
1131                 sb1000_send_command(ioaddr, name, Command1);
1132                 sb1000_wait_for_ready(ioaddr, name);
1133                 sb1000_issue_read_command(ioaddr, name);
1134                 lp->rx_error_count = 0;
1135         }
1136
1137         return IRQ_HANDLED;
1138 }
1139
1140 static int sb1000_close(struct net_device *dev)
1141 {
1142         int i;
1143         int ioaddr[2];
1144         struct sb1000_private *lp = netdev_priv(dev);
1145
1146         if (sb1000_debug > 2)
1147                 printk(KERN_DEBUG "%s: Shutting down sb1000.\n", dev->name);
1148
1149         netif_stop_queue(dev);
1150
1151         ioaddr[0] = dev->base_addr;
1152         /* mem_start holds the second I/O address */
1153         ioaddr[1] = dev->mem_start;
1154
1155         free_irq(dev->irq, dev);
1156         /* If we don't do this, we can't re-insmod it later. */
1157         release_region(ioaddr[1], SB1000_IO_EXTENT);
1158         release_region(ioaddr[0], SB1000_IO_EXTENT);
1159
1160         /* free rx_skb's if needed */
1161         for (i=0; i<4; i++) {
1162                 if (lp->rx_skb[i]) {
1163                         dev_kfree_skb(lp->rx_skb[i]);
1164                 }
1165         }
1166         return 0;
1167 }
1168
1169 MODULE_AUTHOR("Franco Venturi <fventuri@mediaone.net>");
1170 MODULE_DESCRIPTION("General Instruments SB1000 driver");
1171 MODULE_LICENSE("GPL");
1172
1173 module_pnp_driver(sb1000_driver);