drivers/net/sb1000.c

   1 /* sb1000.c: A General Instruments SB1000 driver for linux. */
   2 /*
   3         Written 1998 by Franco Venturi.
   4
   5         Copyright 1998 by Franco Venturi.
   6         Copyright 1994,1995 by Donald Becker.
   7         Copyright 1993 United States Government as represented by the
   8         Director, National Security Agency.
   9
  10         This driver is for the General Instruments SB1000 (internal SURFboard)
  11
  12         The author may be reached as fventuri@mediaone.net
  13
  14         This program is free software; you can redistribute it
  15         and/or  modify it under  the terms of  the GNU General
  16         Public  License as  published  by  the  Free  Software
  17         Foundation;  either  version 2 of the License, or  (at
  18         your option) any later version.
  19
  20         Changes:
  21
  22         981115 Steven Hirsch <shirsch@adelphia.net>
  23
  24         Linus changed the timer interface.  Should work on all recent
  25         development kernels.
  26
  27         980608 Steven Hirsch <shirsch@adelphia.net>
  28
  29         Small changes to make it work with 2.1.x kernels. Hopefully,
  30         nothing major will change before official release of Linux 2.2.
  31
  32         Merged with 2.2 - Alan Cox
  33 */
  34
  35 static char version[] = "sb1000.c:v1.1.2 6/01/98 (fventuri@mediaone.net)\n";
  36
  37 #include <linux/module.h>
  38 #include <linux/kernel.h>
  39 #include <linux/string.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/errno.h>
  42 #include <linux/if_cablemodem.h> /* for SIOGCM/SIOSCM stuff */
  43 #include <linux/in.h>
  44 #include <linux/slab.h>
  45 #include <linux/ioport.h>
  46 #include <linux/netdevice.h>
  47 #include <linux/if_arp.h>
  48 #include <linux/skbuff.h>
  49 #include <linux/delay.h>        /* for udelay() */
  50 #include <linux/etherdevice.h>
  51 #include <linux/pnp.h>
  52 #include <linux/init.h>
  53 #include <linux/bitops.h>
  54
  55 #include <asm/io.h>
  56 #include <asm/processor.h>
  57 #include <asm/uaccess.h>
  58
  59 #ifdef SB1000_DEBUG
  60 static int sb1000_debug = SB1000_DEBUG;
  61 #else
  62 static int sb1000_debug = 1;
  63 #endif
  64
  65 static const int SB1000_IO_EXTENT = 8;
  66 /* SB1000 Maximum Receive Unit */
  67 static const int SB1000_MRU = 1500; /* octects */
  68
  69 #define NPIDS 4
  70 struct sb1000_private {
  71         struct sk_buff *rx_skb[NPIDS];
  72         short rx_dlen[NPIDS];
  73         unsigned int rx_frames;
  74         short rx_error_count;
  75         short rx_error_dpc_count;
  76         unsigned char rx_session_id[NPIDS];
  77         unsigned char rx_frame_id[NPIDS];
  78         unsigned char rx_pkt_type[NPIDS];
  79         struct net_device_stats stats;
  80 };
  81
  82 /* prototypes for Linux interface */
  83 extern int sb1000_probe(struct net_device *dev);
  84 static int sb1000_open(struct net_device *dev);
  85 static int sb1000_dev_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd);
  86 static int sb1000_start_xmit(struct sk_buff *skb, struct net_device *dev);
  87 static irqreturn_t sb1000_interrupt(int irq, void *dev_id, struct pt_regs *regs);
  88 static struct net_device_stats *sb1000_stats(struct net_device *dev);
  89 static int sb1000_close(struct net_device *dev);
  90
  91
  92 /* SB1000 hardware routines to be used during open/configuration phases */
  93 static inline void nicedelay(unsigned long usecs);
  94 static inline int card_wait_for_busy_clear(const int ioaddr[],
  95         const char* name);
  96 static inline int card_wait_for_ready(const int ioaddr[], const char* name,
  97         unsigned char in[]);
  98 static inline int card_send_command(const int ioaddr[], const char* name,
  99         const unsigned char out[], unsigned char in[]);
 100
 101 /* SB1000 hardware routines to be used during frame rx interrupt */
 102 static inline int sb1000_wait_for_ready(const int ioaddr[], const char* name);
 103 static inline int sb1000_wait_for_ready_clear(const int ioaddr[],
 104         const char* name);
 105 static inline void sb1000_send_command(const int ioaddr[], const char* name,
 106         const unsigned char out[]);
 107 static inline void sb1000_read_status(const int ioaddr[], unsigned char in[]);
 108 static inline void sb1000_issue_read_command(const int ioaddr[],
 109         const char* name);
 110
 111 /* SB1000 commands for open/configuration */
 112 static inline int sb1000_reset(const int ioaddr[], const char* name);
 113 static inline int sb1000_check_CRC(const int ioaddr[], const char* name);
 114 static inline int sb1000_start_get_set_command(const int ioaddr[],
 115         const char* name);
 116 static inline int sb1000_end_get_set_command(const int ioaddr[],
 117         const char* name);
 118 static inline int sb1000_activate(const int ioaddr[], const char* name);
 119 static int sb1000_get_firmware_version(const int ioaddr[],
 120         const char* name, unsigned char version[], int do_end);
 121 static int sb1000_get_frequency(const int ioaddr[], const char* name,
 122         int* frequency);
 123 static int sb1000_set_frequency(const int ioaddr[], const char* name,
 124         int frequency);
 125 static int sb1000_get_PIDs(const int ioaddr[], const char* name,
 126         short PID[]);
 127 static int sb1000_set_PIDs(const int ioaddr[], const char* name,
 128         const short PID[]);
 129
 130 /* SB1000 commands for frame rx interrupt */
 131 static inline int sb1000_rx(struct net_device *dev);
 132 static inline void sb1000_error_dpc(struct net_device *dev);
 133
 134 static const struct pnp_device_id sb1000_pnp_ids[] = {
 135         { "GIC1000", 0 },
 136         { "", 0 }
 137 };
 138 MODULE_DEVICE_TABLE(pnp, sb1000_pnp_ids);
 139
 140 static int
 141 sb1000_probe_one(struct pnp_dev *pdev, const struct pnp_device_id *id)
 142 {
 143         struct net_device *dev;
 144         unsigned short ioaddr[2], irq;
 145         unsigned int serial_number;
 146         int error = -ENODEV;
 147
 148         if (pnp_device_attach(pdev) < 0)
 149                 return -ENODEV;
 150         if (pnp_activate_dev(pdev) < 0)
 151                 goto out_detach;
 152
 153         if (!pnp_port_valid(pdev, 0) || !pnp_port_valid(pdev, 1))
 154                 goto out_disable;
 155         if (!pnp_irq_valid(pdev, 0))
 156                 goto out_disable;
 157
 158         serial_number = pdev->card->serial;
 159
 160         ioaddr[0] = pnp_port_start(pdev, 0);
 161         ioaddr[1] = pnp_port_start(pdev, 0);
 162
 163         irq = pnp_irq(pdev, 0);
 164
 165         if (!request_region(ioaddr[0], 16, "sb1000"))
 166                 goto out_disable;
 167         if (!request_region(ioaddr[1], 16, "sb1000"))
 168                 goto out_release_region0;
 169
 170         dev = alloc_etherdev(sizeof(struct sb1000_private));
 171         if (!dev) {
 172                 error = -ENOMEM;
 173                 goto out_release_regions;
 174         }
 175
 176
 177         dev->base_addr = ioaddr[0];
 178         /* mem_start holds the second I/O address */
 179         dev->mem_start = ioaddr[1];
 180         dev->irq = irq;
 181
 182         if (sb1000_debug > 0)
 183                 printk(KERN_NOTICE "%s: sb1000 at (%#3.3lx,%#3.3lx), "
 184                         "S/N %#8.8x, IRQ %d.\n", dev->name, dev->base_addr,
 185                         dev->mem_start, serial_number, dev->irq);
 186
 187         /*
 188          * The SB1000 is an rx-only cable modem device.  The uplink is a modem
 189          * and we do not want to arp on it.
 190          */
 191         dev->flags = IFF_POINTOPOINT|IFF_NOARP;
 192
 193         SET_MODULE_OWNER(dev);
 194         SET_NETDEV_DEV(dev, &pdev->dev);
 195
 196         if (sb1000_debug > 0)
 197                 printk(KERN_NOTICE "%s", version);
 198
 199         /* The SB1000-specific entries in the device structure. */
 200         dev->open               = sb1000_open;
 201         dev->do_ioctl           = sb1000_dev_ioctl;
 202         dev->hard_start_xmit    = sb1000_start_xmit;
 203         dev->stop               = sb1000_close;
 204         dev->get_stats          = sb1000_stats;
 205
 206         /* hardware address is 0:0:serial_number */
 207         dev->dev_addr[2]        = serial_number >> 24 & 0xff;
 208         dev->dev_addr[3]        = serial_number >> 16 & 0xff;
 209         dev->dev_addr[4]        = serial_number >>  8 & 0xff;
 210         dev->dev_addr[5]        = serial_number >>  0 & 0xff;
 211
 212         pnp_set_drvdata(pdev, dev);
 213
 214         error = register_netdev(dev);
 215         if (error)
 216                 goto out_free_netdev;
 217         return 0;
 218
 219  out_free_netdev:
 220         free_netdev(dev);
 221  out_release_regions:
 222         release_region(ioaddr[1], 16);
 223  out_release_region0:
 224         release_region(ioaddr[0], 16);
 225  out_disable:
 226         pnp_disable_dev(pdev);
 227  out_detach:
 228         pnp_device_detach(pdev);
 229         return error;
 230 }
 231
 232 static void
 233 sb1000_remove_one(struct pnp_dev *pdev)
 234 {
 235         struct net_device *dev = pnp_get_drvdata(pdev);
 236
 237         unregister_netdev(dev);
 238         release_region(dev->base_addr, 16);
 239         release_region(dev->mem_start, 16);
 240         free_netdev(dev);
 241 }
 242
 243 static struct pnp_driver sb1000_driver = {
 244         .name           = "sb1000",
 245         .id_table       = sb1000_pnp_ids,
 246         .probe          = sb1000_probe_one,
 247         .remove         = sb1000_remove_one,
 248 };
 249
 250 \f
 251 /*
 252  * SB1000 hardware routines to be used during open/configuration phases
 253  */
 254
 255 static const int TimeOutJiffies = (875 * HZ) / 100;
 256
 257 static inline void nicedelay(unsigned long usecs)
 258 {
 259         current->state = TASK_INTERRUPTIBLE;
 260         schedule_timeout(HZ);
 261         return;
 262 }
 263
 264 /* Card Wait For Busy Clear (cannot be used during an interrupt) */
 265 static inline int
 266 card_wait_for_busy_clear(const int ioaddr[], const char* name)
 267 {
 268         unsigned char a;
 269         unsigned long timeout;
 270
 271         a = inb(ioaddr[0] + 7);
 272         timeout = jiffies + TimeOutJiffies;
 273         while (a & 0x80 || a & 0x40) {
 274                 /* a little sleep */
 275                 yield();
 276
 277                 a = inb(ioaddr[0] + 7);
 278                 if (time_after_eq(jiffies, timeout)) {
 279                         printk(KERN_WARNING "%s: card_wait_for_busy_clear timeout\n",
 280                                 name);
 281                         return -ETIME;
 282                 }
 283         }
 284
 285         return 0;
 286 }
 287
 288 /* Card Wait For Ready (cannot be used during an interrupt) */
 289 static inline int
 290 card_wait_for_ready(const int ioaddr[], const char* name, unsigned char in[])
 291 {
 292         unsigned char a;
 293         unsigned long timeout;
 294
 295         a = inb(ioaddr[1] + 6);
 296         timeout = jiffies + TimeOutJiffies;
 297         while (a & 0x80 || !(a & 0x40)) {
 298                 /* a little sleep */
 299                 yield();
 300
 301                 a = inb(ioaddr[1] + 6);
 302                 if (time_after_eq(jiffies, timeout)) {
 303                         printk(KERN_WARNING "%s: card_wait_for_ready timeout\n",
 304                                 name);
 305                         return -ETIME;
 306                 }
 307         }
 308
 309         in[1] = inb(ioaddr[0] + 1);
 310         in[2] = inb(ioaddr[0] + 2);
 311         in[3] = inb(ioaddr[0] + 3);
 312         in[4] = inb(ioaddr[0] + 4);
 313         in[0] = inb(ioaddr[0] + 5);
 314         in[6] = inb(ioaddr[0] + 6);
 315         in[5] = inb(ioaddr[1] + 6);
 316         return 0;
 317 }
 318
 319 /* Card Send Command (cannot be used during an interrupt) */
 320 static inline int
 321 card_send_command(const int ioaddr[], const char* name,
 322         const unsigned char out[], unsigned char in[])
 323 {
 324         int status, x;
 325
 326         if ((status = card_wait_for_busy_clear(ioaddr, name)))
 327                 return status;
 328         outb(0xa0, ioaddr[0] + 6);
 329         outb(out[2], ioaddr[0] + 1);
 330         outb(out[3], ioaddr[0] + 2);
 331         outb(out[4], ioaddr[0] + 3);
 332         outb(out[5], ioaddr[0] + 4);
 333         outb(out[1], ioaddr[0] + 5);
 334         outb(0xa0, ioaddr[0] + 6);
 335         outb(out[0], ioaddr[0] + 7);
 336         if (out[0] != 0x20 && out[0] != 0x30) {
 337                 if ((status = card_wait_for_ready(ioaddr, name, in)))
 338                         return status;
 339                 inb(ioaddr[0] + 7);
 340                 if (sb1000_debug > 3)
 341                         printk(KERN_DEBUG "%s: card_send_command "
 342                                 "out: %02x%02x%02x%02x%02x%02x  "
 343                                 "in: %02x%02x%02x%02x%02x%02x%02x\n", name,
 344                                 out[0], out[1], out[2], out[3], out[4], out[5],
 345                                 in[0], in[1], in[2], in[3], in[4], in[5], in[6]);
 346         } else {
 347                 if (sb1000_debug > 3)
 348                         printk(KERN_DEBUG "%s: card_send_command "
 349                                 "out: %02x%02x%02x%02x%02x%02x\n", name,
 350                                 out[0], out[1], out[2], out[3], out[4], out[5]);
 351         }
 352
 353         if (out[1] == 0x1b) {
 354                 x = (out[2] == 0x02);
 355         } else {
 356                 if (out[0] >= 0x80 && in[0] != (out[1] | 0x80))
 357                         return -EIO;
 358         }
 359         return 0;
 360 }
 361
 362 \f
 363 /*
 364  * SB1000 hardware routines to be used during frame rx interrupt
 365  */
 366 static const int Sb1000TimeOutJiffies = 7 * HZ;
 367
 368 /* Card Wait For Ready (to be used during frame rx) */
 369 static inline int
 370 sb1000_wait_for_ready(const int ioaddr[], const char* name)
 371 {
 372         unsigned long timeout;
 373
 374         timeout = jiffies + Sb1000TimeOutJiffies;
 375         while (inb(ioaddr[1] + 6) & 0x80) {
 376                 if (time_after_eq(jiffies, timeout)) {
 377                         printk(KERN_WARNING "%s: sb1000_wait_for_ready timeout\n",
 378                                 name);
 379                         return -ETIME;
 380                 }
 381         }
 382         timeout = jiffies + Sb1000TimeOutJiffies;
 383         while (!(inb(ioaddr[1] + 6) & 0x40)) {
 384                 if (time_after_eq(jiffies, timeout)) {
 385                         printk(KERN_WARNING "%s: sb1000_wait_for_ready timeout\n",
 386                                 name);
 387                         return -ETIME;
 388                 }
 389         }
 390         inb(ioaddr[0] + 7);
 391         return 0;
 392 }
 393
 394 /* Card Wait For Ready Clear (to be used during frame rx) */
 395 static inline int
 396 sb1000_wait_for_ready_clear(const int ioaddr[], const char* name)
 397 {
 398         unsigned long timeout;
 399
 400         timeout = jiffies + Sb1000TimeOutJiffies;
 401         while (inb(ioaddr[1] + 6) & 0x80) {
 402                 if (time_after_eq(jiffies, timeout)) {
 403                         printk(KERN_WARNING "%s: sb1000_wait_for_ready_clear timeout\n",
 404                                 name);
 405                         return -ETIME;
 406                 }
 407         }
 408         timeout = jiffies + Sb1000TimeOutJiffies;
 409         while (inb(ioaddr[1] + 6) & 0x40) {
 410                 if (time_after_eq(jiffies, timeout)) {
 411                         printk(KERN_WARNING "%s: sb1000_wait_for_ready_clear timeout\n",
 412                                 name);
 413                         return -ETIME;
 414                 }
 415         }
 416         return 0;
 417 }
 418
 419 /* Card Send Command (to be used during frame rx) */
 420 static inline void
 421 sb1000_send_command(const int ioaddr[], const char* name,
 422         const unsigned char out[])
 423 {
 424         outb(out[2], ioaddr[0] + 1);
 425         outb(out[3], ioaddr[0] + 2);
 426         outb(out[4], ioaddr[0] + 3);
 427         outb(out[5], ioaddr[0] + 4);
 428         outb(out[1], ioaddr[0] + 5);
 429         outb(out[0], ioaddr[0] + 7);
 430         if (sb1000_debug > 3)
 431                 printk(KERN_DEBUG "%s: sb1000_send_command out: %02x%02x%02x%02x"
 432                         "%02x%02x\n", name, out[0], out[1], out[2], out[3], out[4], out[5]);
 433         return;
 434 }
 435
 436 /* Card Read Status (to be used during frame rx) */
 437 static inline void
 438 sb1000_read_status(const int ioaddr[], unsigned char in[])
 439 {
 440         in[1] = inb(ioaddr[0] + 1);
 441         in[2] = inb(ioaddr[0] + 2);
 442         in[3] = inb(ioaddr[0] + 3);
 443         in[4] = inb(ioaddr[0] + 4);
 444         in[0] = inb(ioaddr[0] + 5);
 445         return;
 446 }
 447
 448 /* Issue Read Command (to be used during frame rx) */
 449 static inline void
 450 sb1000_issue_read_command(const int ioaddr[], const char* name)
 451 {
 452         const unsigned char Command0[6] = {0x20, 0x00, 0x00, 0x01, 0x00, 0x00};
 453
 454         sb1000_wait_for_ready_clear(ioaddr, name);
 455         outb(0xa0, ioaddr[0] + 6);
 456         sb1000_send_command(ioaddr, name, Command0);
 457         return;
 458 }
 459
 460 \f
 461 /*
 462  * SB1000 commands for open/configuration
 463  */
 464 /* reset SB1000 card */
 465 static inline int
 466 sb1000_reset(const int ioaddr[], const char* name)
 467 {
 468         unsigned char st[7];
 469         int port, status;
 470         const unsigned char Command0[6] = {0x80, 0x16, 0x00, 0x00, 0x00, 0x00};
 471
 472         port = ioaddr[1] + 6;
 473         outb(0x4, port);
 474         inb(port);
 475         udelay(1000);
 476         outb(0x0, port);
 477         inb(port);
 478         nicedelay(60000);
 479         outb(0x4, port);
 480         inb(port);
 481         udelay(1000);
 482         outb(0x0, port);
 483         inb(port);
 484         udelay(0);
 485
 486         if ((status = card_send_command(ioaddr, name, Command0, st)))
 487                 return status;
 488         if (st[3] != 0xf0)
 489                 return -EIO;
 490         return 0;
 491 }
 492
 493 /* check SB1000 firmware CRC */
 494 static inline int
 495 sb1000_check_CRC(const int ioaddr[], const char* name)
 496 {
 497         unsigned char st[7];
 498         int crc, status;
 499         const unsigned char Command0[6] = {0x80, 0x1f, 0x00, 0x00, 0x00, 0x00};
 500
 501         /* check CRC */
 502         if ((status = card_send_command(ioaddr, name, Command0, st)))
 503                 return status;
 504         if (st[1] != st[3] || st[2] != st[4])
 505                 return -EIO;
 506         crc = st[1] << 8 | st[2];
 507         return 0;
 508 }
 509
 510 static inline int
 511 sb1000_start_get_set_command(const int ioaddr[], const char* name)
 512 {
 513         unsigned char st[7];
 514         const unsigned char Command0[6] = {0x80, 0x1b, 0x00, 0x00, 0x00, 0x00};
 515
 516         return card_send_command(ioaddr, name, Command0, st);
 517 }
 518
 519 static inline int
 520 sb1000_end_get_set_command(const int ioaddr[], const char* name)
 521 {
 522         unsigned char st[7];
 523         int status;
 524         const unsigned char Command0[6] = {0x80, 0x1b, 0x02, 0x00, 0x00, 0x00};
 525         const unsigned char Command1[6] = {0x20, 0x00, 0x00, 0x00, 0x00, 0x00};
 526
 527         if ((status = card_send_command(ioaddr, name, Command0, st)))
 528                 return status;
 529         return card_send_command(ioaddr, name, Command1, st);
 530 }
 531
 532 static inline int
 533 sb1000_activate(const int ioaddr[], const char* name)
 534 {
 535         unsigned char st[7];
 536         int status;
 537         const unsigned char Command0[6] = {0x80, 0x11, 0x00, 0x00, 0x00, 0x00};
 538         const unsigned char Command1[6] = {0x80, 0x16, 0x00, 0x00, 0x00, 0x00};
 539
 540         nicedelay(50000);
 541         if ((status = card_send_command(ioaddr, name, Command0, st)))
 542                 return status;
 543         if ((status = card_send_command(ioaddr, name, Command1, st)))
 544                 return status;
 545         if (st[3] != 0xf1) {
 546         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 547                         return status;
 548                 return -EIO;
 549         }
 550         udelay(1000);
 551     return sb1000_start_get_set_command(ioaddr, name);
 552 }
 553
 554 /* get SB1000 firmware version */
 555 static int
 556 sb1000_get_firmware_version(const int ioaddr[], const char* name,
 557         unsigned char version[], int do_end)
 558 {
 559         unsigned char st[7];
 560         int status;
 561         const unsigned char Command0[6] = {0x80, 0x23, 0x00, 0x00, 0x00, 0x00};
 562
 563         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 564                 return status;
 565         if ((status = card_send_command(ioaddr, name, Command0, st)))
 566                 return status;
 567         if (st[0] != 0xa3)
 568                 return -EIO;
 569         version[0] = st[1];
 570         version[1] = st[2];
 571         if (do_end)
 572                 return sb1000_end_get_set_command(ioaddr, name);
 573         else
 574                 return 0;
 575 }
 576
 577 /* get SB1000 frequency */
 578 static int
 579 sb1000_get_frequency(const int ioaddr[], const char* name, int* frequency)
 580 {
 581         unsigned char st[7];
 582         int status;
 583         const unsigned char Command0[6] = {0x80, 0x44, 0x00, 0x00, 0x00, 0x00};
 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         unsigned char st[7];
 629         int status;
 630         const unsigned char Command0[6] = {0x80, 0x40, 0x00, 0x00, 0x00, 0x00};
 631         const unsigned char Command1[6] = {0x80, 0x41, 0x00, 0x00, 0x00, 0x00};
 632         const unsigned char Command2[6] = {0x80, 0x42, 0x00, 0x00, 0x00, 0x00};
 633         const unsigned char Command3[6] = {0x80, 0x43, 0x00, 0x00, 0x00, 0x00};
 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         unsigned char st[7];
 663         short p;
 664         int status;
 665         unsigned char Command0[6] = {0x80, 0x31, 0x00, 0x00, 0x00, 0x00};
 666         unsigned char Command1[6] = {0x80, 0x32, 0x00, 0x00, 0x00, 0x00};
 667         unsigned char Command2[6] = {0x80, 0x33, 0x00, 0x00, 0x00, 0x00};
 668         unsigned char Command3[6] = {0x80, 0x34, 0x00, 0x00, 0x00, 0x00};
 669         const unsigned char Command4[6] = {0x80, 0x2e, 0x00, 0x00, 0x00, 0x00};
 670
 671         udelay(1000);
 672         if ((status = sb1000_start_get_set_command(ioaddr, name)))
 673                 return status;
 674
 675         p = PID[0];
 676         Command0[3] = p & 0xff;
 677         p >>= 8;
 678         Command0[2] = p & 0xff;
 679         if ((status = card_send_command(ioaddr, name, Command0, st)))
 680                 return status;
 681
 682         p = PID[1];
 683         Command1[3] = p & 0xff;
 684         p >>= 8;
 685         Command1[2] = p & 0xff;
 686         if ((status = card_send_command(ioaddr, name, Command1, st)))
 687                 return status;
 688
 689         p = PID[2];
 690         Command2[3] = p & 0xff;
 691         p >>= 8;
 692         Command2[2] = p & 0xff;
 693         if ((status = card_send_command(ioaddr, name, Command2, st)))
 694                 return status;
 695
 696         p = PID[3];
 697         Command3[3] = p & 0xff;
 698         p >>= 8;
 699         Command3[2] = p & 0xff;
 700         if ((status = card_send_command(ioaddr, name, Command3, st)))
 701                 return status;
 702
 703         if ((status = card_send_command(ioaddr, name, Command4, st)))
 704                 return status;
 705         return sb1000_end_get_set_command(ioaddr, name);
 706 }
 707
 708 \f
 709 static inline void
 710 sb1000_print_status_buffer(const char* name, unsigned char st[],
 711         unsigned char buffer[], int size)
 712 {
 713         int i, j, k;
 714
 715         printk(KERN_DEBUG "%s: status: %02x %02x\n", name, st[0], st[1]);
 716         if (buffer[24] == 0x08 && buffer[25] == 0x00 && buffer[26] == 0x45) {
 717                 printk(KERN_DEBUG "%s: length: %d protocol: %d from: %d.%d.%d.%d:%d "
 718                         "to %d.%d.%d.%d:%d\n", name, buffer[28] << 8 | buffer[29],
 719                         buffer[35], buffer[38], buffer[39], buffer[40], buffer[41],
 720             buffer[46] << 8 | buffer[47],
 721                         buffer[42], buffer[43], buffer[44], buffer[45],
 722             buffer[48] << 8 | buffer[49]);
 723         } else {
 724                 for (i = 0, k = 0; i < (size + 7) / 8; i++) {
 725                         printk(KERN_DEBUG "%s: %s", name, i ? "       " : "buffer:");
 726                         for (j = 0; j < 8 && k < size; j++, k++)
 727                                 printk(" %02x", buffer[k]);
 728                         printk("\n");
 729                 }
 730         }
 731         return;
 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 inline 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 = &lp->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->mac.raw = skb->data;
 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         dev->last_rx = jiffies;
 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 inline void
 904 sb1000_error_dpc(struct net_device *dev)
 905 {
 906         char *name;
 907         unsigned char st[5];
 908         int ioaddr[2];
 909         struct sb1000_private *lp = netdev_priv(dev);
 910         const unsigned char Command0[6] = {0x80, 0x26, 0x00, 0x00, 0x00, 0x00};
 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         return;
 925 }
 926
 927 \f
 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         nicedelay(200000);
 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[0] = 0x48;
 965         lp->rx_session_id[0] = 0x44;
 966         lp->rx_session_id[0] = 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] = lp->stats.rx_bytes;
1015                 stats[1] = lp->rx_frames;
1016                 stats[2] = lp->stats.rx_packets;
1017                 stats[3] = lp->stats.rx_errors;
1018                 stats[4] = lp->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 int
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 0;
1087 }
1088
1089 /* SB1000 interrupt handler. */
1090 static irqreturn_t sb1000_interrupt(int irq, void *dev_id, struct pt_regs *regs)
1091 {
1092         char *name;
1093         unsigned char st;
1094         int ioaddr[2];
1095         struct net_device *dev = (struct net_device *) dev_id;
1096         struct sb1000_private *lp = netdev_priv(dev);
1097
1098         const unsigned char Command0[6] = {0x80, 0x2c, 0x00, 0x00, 0x00, 0x00};
1099         const unsigned char Command1[6] = {0x80, 0x2e, 0x00, 0x00, 0x00, 0x00};
1100         const int MaxRxErrorCount = 6;
1101
1102         if (dev == NULL) {
1103                 printk(KERN_ERR "sb1000_interrupt(): irq %d for unknown device.\n",
1104                         irq);
1105                 return IRQ_NONE;
1106         }
1107
1108         ioaddr[0] = dev->base_addr;
1109         /* mem_start holds the second I/O address */
1110         ioaddr[1] = dev->mem_start;
1111         name = dev->name;
1112
1113         /* is it a good interrupt? */
1114         st = inb(ioaddr[1] + 6);
1115         if (!(st & 0x08 && st & 0x20)) {
1116                 return IRQ_NONE;
1117         }
1118
1119         if (sb1000_debug > 3)
1120                 printk(KERN_DEBUG "%s: entering interrupt\n", dev->name);
1121
1122         st = inb(ioaddr[0] + 7);
1123         if (sb1000_rx(dev))
1124                 lp->rx_error_count++;
1125 #ifdef SB1000_DELAY
1126         udelay(SB1000_DELAY);
1127 #endif /* SB1000_DELAY */
1128         sb1000_issue_read_command(ioaddr, name);
1129         if (st & 0x01) {
1130                 sb1000_error_dpc(dev);
1131                 sb1000_issue_read_command(ioaddr, name);
1132         }
1133         if (lp->rx_error_dpc_count && !(--lp->rx_error_dpc_count)) {
1134                 sb1000_wait_for_ready_clear(ioaddr, name);
1135                 sb1000_send_command(ioaddr, name, Command0);
1136                 sb1000_wait_for_ready(ioaddr, name);
1137                 sb1000_issue_read_command(ioaddr, name);
1138         }
1139         if (lp->rx_error_count >= MaxRxErrorCount) {
1140                 sb1000_wait_for_ready_clear(ioaddr, name);
1141                 sb1000_send_command(ioaddr, name, Command1);
1142                 sb1000_wait_for_ready(ioaddr, name);
1143                 sb1000_issue_read_command(ioaddr, name);
1144                 lp->rx_error_count = 0;
1145         }
1146
1147         return IRQ_HANDLED;
1148 }
1149
1150 static struct net_device_stats *sb1000_stats(struct net_device *dev)
1151 {
1152         struct sb1000_private *lp = netdev_priv(dev);
1153         return &lp->stats;
1154 }
1155
1156 static int sb1000_close(struct net_device *dev)
1157 {
1158         int i;
1159         int ioaddr[2];
1160         struct sb1000_private *lp = netdev_priv(dev);
1161
1162         if (sb1000_debug > 2)
1163                 printk(KERN_DEBUG "%s: Shutting down sb1000.\n", dev->name);
1164
1165         netif_stop_queue(dev);
1166
1167         ioaddr[0] = dev->base_addr;
1168         /* mem_start holds the second I/O address */
1169         ioaddr[1] = dev->mem_start;
1170
1171         free_irq(dev->irq, dev);
1172         /* If we don't do this, we can't re-insmod it later. */
1173         release_region(ioaddr[1], SB1000_IO_EXTENT);
1174         release_region(ioaddr[0], SB1000_IO_EXTENT);
1175
1176         /* free rx_skb's if needed */
1177         for (i=0; i<4; i++) {
1178                 if (lp->rx_skb[i]) {
1179                         dev_kfree_skb(lp->rx_skb[i]);
1180                 }
1181         }
1182         return 0;
1183 }
1184
1185 MODULE_AUTHOR("Franco Venturi <fventuri@mediaone.net>");
1186 MODULE_DESCRIPTION("General Instruments SB1000 driver");
1187 MODULE_LICENSE("GPL");
1188
1189 static int __init
1190 sb1000_init(void)
1191 {
1192         return pnp_register_driver(&sb1000_driver);
1193 }
1194
1195 static void __exit
1196 sb1000_exit(void)
1197 {
1198         pnp_unregister_driver(&sb1000_driver);
1199 }
1200
1201 module_init(sb1000_init);
1202 module_exit(sb1000_exit);