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