drivers/net/sb1000.c

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