arch/all-pc/boot/grub/netboot/sk_g16.c

   1 /**************************************************************************
   2 Etherboot -  BOOTP/TFTP Bootstrap Program
   3 Schneider & Koch G16 NIC driver for Etherboot
   4 heavily based on SK G16 driver from Linux 2.0.36
   5 Changes to make it work with Etherboot by Georg Baum <Georg.Baum@gmx.de>
   6 ***************************************************************************/
   7
   8 /*-
   9  * Copyright (C) 1994 by PJD Weichmann & SWS Bern, Switzerland
  10  *
  11  * This software may be used and distributed according to the terms
  12  * of the GNU Public License, incorporated herein by reference.
  13  *
  14  * Module         : sk_g16.c
  15  *
  16  * Version        : $Revision$
  17  *
  18  * Author         : Patrick J.D. Weichmann
  19  *
  20  * Date Created   : 94/05/26
  21  * Last Updated   : $Date$
  22  *
  23  * Description    : Schneider & Koch G16 Ethernet Device Driver for
  24  *                  Linux Kernel >= 1.1.22
  25  * Update History :
  26  *
  27 -*/
  28
  29 /*
  30  * The Schneider & Koch (SK) G16 Network device driver is based
  31  * on the 'ni6510' driver from Michael Hipp which can be found at
  32  * ftp://sunsite.unc.edu/pub/Linux/system/Network/drivers/nidrivers.tar.gz
  33  *
  34  * Sources: 1) ni6510.c by M. Hipp
  35  *          2) depca.c  by D.C. Davies
  36  *          3) skeleton.c by D. Becker
  37  *          4) Am7990 Local Area Network Controller for Ethernet (LANCE),
  38  *             AMD, Pub. #05698, June 1989
  39  *
  40  * Many Thanks for helping me to get things working to:
  41  *
  42  *                 A. Cox (A.Cox@swansea.ac.uk)
  43  *                 M. Hipp (mhipp@student.uni-tuebingen.de)
  44  *                 R. Bolz (Schneider & Koch, Germany)
  45  *
  46  * See README.sk_g16 for details about limitations and bugs for the
  47  * current version.
  48  *
  49  * To Do:
  50  *        - Support of SK_G8 and other SK Network Cards.
  51  *        - Autoset memory mapped RAM. Check for free memory and then
  52  *          configure RAM correctly.
  53  *        - SK_close should really set card in to initial state.
  54  *        - Test if IRQ 3 is not switched off. Use autoirq() functionality.
  55  *          (as in /drivers/net/skeleton.c)
  56  *        - Implement Multicast addressing. At minimum something like
  57  *          in depca.c.
  58  *        - Redo the statistics part.
  59  *        - Try to find out if the board is in 8 Bit or 16 Bit slot.
  60  *          If in 8 Bit mode don't use IRQ 11.
  61  *        - (Try to make it slightly faster.)
  62  */
  63
  64 /* to get some global routines like printf */
  65 #include "etherboot.h"
  66 /* to get the interface to the body of the program */
  67 #include "nic.h"
  68
  69 /* From linux/if_ether.h: */
  70 #define ETH_ZLEN        60              /* Min. octets in frame sans FCS */
  71
  72 #include "sk_g16.h"
  73
  74 /*
  75  * Schneider & Koch Card Definitions
  76  * =================================
  77  */
  78
  79 #define SK_NAME   "SK_G16"
  80
  81 /*
  82  * SK_G16 Configuration
  83  * --------------------
  84  */
  85
  86 /*
  87  * Abbreviations
  88  * -------------
  89  *
  90  * RAM - used for the 16KB shared memory
  91  * Boot_ROM, ROM - are used for referencing the BootEPROM
  92  *
  93  * SK_ADDR is a symbolic constant used to configure
  94  * the behaviour of the driver and the SK_G16.
  95  *
  96  * SK_ADDR defines the address where the RAM will be mapped into the real
  97  *         host memory.
  98  *         valid addresses are from 0xa0000 to 0xfc000 in 16Kbyte steps.
  99  */
 100
 101 #define SK_ADDR         0xcc000
 102
 103 /*
 104  * In POS3 are bits A14-A19 of the address bus. These bits can be set
 105  * to choose the RAM address. That's why we only can choose the RAM address
 106  * in 16KB steps.
 107  */
 108
 109 #define POS_ADDR       (rom_addr>>14)  /* Do not change this line */
 110
 111 /*
 112  * SK_G16 I/O PORT's + IRQ's + Boot_ROM locations
 113  * ----------------------------------------------
 114  */
 115
 116 /*
 117  * As nearly every card has also SK_G16 a specified I/O Port region and
 118  * only a few possible IRQ's.
 119  * In the Installation Guide from Schneider & Koch is listed a possible
 120  * Interrupt IRQ2. IRQ2 is always IRQ9 in boards with two cascaded interrupt
 121  * controllers. So we use in SK_IRQS IRQ9.
 122  */
 123
 124 /* Don't touch any of the following #defines. */
 125
 126 #define SK_IO_PORTS     { 0x100, 0x180, 0x208, 0x220, 0x288, 0x320, 0x328, 0x390, 0 }
 127
 128 /*
 129  * SK_G16 POS REGISTERS
 130  * --------------------
 131  */
 132
 133 /*
 134  * SK_G16 has a Programmable Option Select (POS) Register.
 135  * The POS is composed of 8 separate registers (POS0-7) which
 136  * are I/O mapped on an address set by the W1 switch.
 137  *
 138  */
 139
 140 #define SK_POS_SIZE 8           /* 8 I/O Ports are used by SK_G16 */
 141
 142 #define SK_POS0     ioaddr      /* Card-ID Low (R) */
 143 #define SK_POS1     ioaddr+1    /* Card-ID High (R) */
 144 #define SK_POS2     ioaddr+2    /* Card-Enable, Boot-ROM Disable (RW) */
 145 #define SK_POS3     ioaddr+3    /* Base address of RAM */
 146 #define SK_POS4     ioaddr+4    /* IRQ */
 147
 148 /* POS5 - POS7 are unused */
 149
 150 /*
 151  * SK_G16 MAC PREFIX
 152  * -----------------
 153  */
 154
 155 /*
 156  * Scheider & Koch manufacturer code (00:00:a5).
 157  * This must be checked, that we are sure it is a SK card.
 158  */
 159
 160 #define SK_MAC0         0x00
 161 #define SK_MAC1         0x00
 162 #define SK_MAC2         0x5a
 163
 164 /*
 165  * SK_G16 ID
 166  * ---------
 167  */
 168
 169 /*
 170  * If POS0,POS1 contain the following ID, then we know
 171  * at which I/O Port Address we are.
 172  */
 173
 174 #define SK_IDLOW  0xfd
 175 #define SK_IDHIGH 0x6a
 176
 177
 178 /*
 179  * LANCE POS Bit definitions
 180  * -------------------------
 181  */
 182
 183 #define SK_ROM_RAM_ON  (POS2_CARD)
 184 #define SK_ROM_RAM_OFF (POS2_EPROM)
 185 #define SK_ROM_ON      (inb(SK_POS2) & POS2_CARD)
 186 #define SK_ROM_OFF     (inb(SK_POS2) | POS2_EPROM)
 187 #define SK_RAM_ON      (inb(SK_POS2) | POS2_CARD)
 188 #define SK_RAM_OFF     (inb(SK_POS2) & POS2_EPROM)
 189
 190 #define POS2_CARD  0x0001              /* 1 = SK_G16 on      0 = off */
 191 #define POS2_EPROM 0x0002              /* 1 = Boot EPROM off 0 = on */
 192
 193 /*
 194  * SK_G16 Memory mapped Registers
 195  * ------------------------------
 196  *
 197  */
 198
 199 #define SK_IOREG        (board->ioreg) /* LANCE data registers.     */
 200 #define SK_PORT         (board->port)  /* Control, Status register  */
 201 #define SK_IOCOM        (board->iocom) /* I/O Command               */
 202
 203 /*
 204  * SK_G16 Status/Control Register bits
 205  * -----------------------------------
 206  *
 207  * (C) Controlreg (S) Statusreg
 208  */
 209
 210 /*
 211  * Register transfer: 0 = no transfer
 212  *                    1 = transferring data between LANCE and I/O reg
 213  */
 214 #define SK_IORUN        0x20
 215
 216 /*
 217  * LANCE interrupt: 0 = LANCE interrupt occurred
 218  *                  1 = no LANCE interrupt occurred
 219  */
 220 #define SK_IRQ          0x10
 221
 222 #define SK_RESET        0x08   /* Reset SK_CARD: 0 = RESET 1 = normal */
 223 #define SK_RW           0x02   /* 0 = write to 1 = read from */
 224 #define SK_ADR          0x01   /* 0 = REG DataPort 1 = RAP Reg addr port */
 225
 226
 227 #define SK_RREG         SK_RW  /* Transferdirection to read from lance */
 228 #define SK_WREG         0      /* Transferdirection to write to lance */
 229 #define SK_RAP          SK_ADR /* Destination Register RAP */
 230 #define SK_RDATA        0      /* Destination Register REG DataPort */
 231
 232 /*
 233  * SK_G16 I/O Command
 234  * ------------------
 235  */
 236
 237 /*
 238  * Any bitcombination sets the internal I/O bit (transfer will start)
 239  * when written to I/O Command
 240  */
 241
 242 #define SK_DOIO         0x80   /* Do Transfer */
 243
 244 /*
 245  * LANCE RAP (Register Address Port).
 246  * ---------------------------------
 247  */
 248
 249 /*
 250  * The LANCE internal registers are selected through the RAP.
 251  * The Registers are:
 252  *
 253  * CSR0 - Status and Control flags
 254  * CSR1 - Low order bits of initialize block (bits 15:00)
 255  * CSR2 - High order bits of initialize block (bits 07:00, 15:08 are reserved)
 256  * CSR3 - Allows redefinition of the Bus Master Interface.
 257  *        This register must be set to 0x0002, which means BSWAP = 0,
 258  *        ACON = 1, BCON = 0;
 259  *
 260  */
 261
 262 #define CSR0            0x00
 263 #define CSR1            0x01
 264 #define CSR2            0x02
 265 #define CSR3            0x03
 266
 267 /*
 268  * General Definitions
 269  * ===================
 270  */
 271
 272 /*
 273  * Set the number of Tx and Rx buffers, using Log_2(# buffers).
 274  * We have 16KB RAM which can be accessed by the LANCE. In the
 275  * memory are not only the buffers but also the ring descriptors and
 276  * the initialize block.
 277  * Don't change anything unless you really know what you do.
 278  */
 279
 280 #define LC_LOG_TX_BUFFERS 1               /* (2 == 2^^1) 2 Transmit buffers */
 281 #define LC_LOG_RX_BUFFERS 2               /* (8 == 2^^3) 8 Receive buffers */
 282
 283 /* Descriptor ring sizes */
 284
 285 #define TMDNUM (1 << (LC_LOG_TX_BUFFERS)) /* 2 Transmit descriptor rings */
 286 #define RMDNUM (1 << (LC_LOG_RX_BUFFERS)) /* 8 Receive Buffers */
 287
 288 /* Define Mask for setting RMD, TMD length in the LANCE init_block */
 289
 290 #define TMDNUMMASK (LC_LOG_TX_BUFFERS << 29)
 291 #define RMDNUMMASK (LC_LOG_RX_BUFFERS << 29)
 292
 293 /*
 294  * Data Buffer size is set to maximum packet length.
 295  */
 296
 297 #define PKT_BUF_SZ              1518
 298
 299 /*
 300  * The number of low I/O ports used by the ethercard.
 301  */
 302
 303 #define ETHERCARD_TOTAL_SIZE    SK_POS_SIZE
 304
 305 /*
 306  * Portreserve is there to mark the Card I/O Port region as used.
 307  * Check_region is to check if the region at ioaddr with the size "size"
 308  * is free or not.
 309  * Snarf_region allocates the I/O Port region.
 310  */
 311
 312 #ifndef HAVE_PORTRESERVE
 313
 314 #define check_region(ioaddr1, size)              0
 315 #define request_region(ioaddr1, size,name)       do ; while (0)
 316
 317 #endif
 318
 319 /*
 320  * SK_DEBUG
 321  *
 322  * Here you can choose what level of debugging wanted.
 323  *
 324  * If SK_DEBUG and SK_DEBUG2 are undefined, then only the
 325  *  necessary messages will be printed.
 326  *
 327  * If SK_DEBUG is defined, there will be many debugging prints
 328  *  which can help to find some mistakes in configuration or even
 329  *  in the driver code.
 330  *
 331  * If SK_DEBUG2 is defined, many many messages will be printed
 332  *  which normally you don't need. I used this to check the interrupt
 333  *  routine.
 334  *
 335  * (If you define only SK_DEBUG2 then only the messages for
 336  *  checking interrupts will be printed!)
 337  *
 338  * Normal way of live is:
 339  *
 340  * For the whole thing get going let both symbolic constants
 341  * undefined. If you face any problems and you know what's going
 342  * on (you know something about the card and you can interpret some
 343  * hex LANCE register output) then define SK_DEBUG
 344  *
 345  */
 346
 347 #undef  SK_DEBUG        /* debugging */
 348 #undef  SK_DEBUG2       /* debugging with more verbose report */
 349
 350 #ifdef  SK_DEBUG
 351 #define PRINTF(x) printf x
 352 #else
 353 #define PRINTF(x) /**/
 354 #endif
 355
 356 #ifdef  SK_DEBUG2
 357 #define PRINTF2(x) printf x
 358 #else
 359 #define PRINTF2(x) /**/
 360 #endif
 361
 362 /*
 363  * SK_G16 RAM
 364  *
 365  * The components are memory mapped and can be set in a region from
 366  * 0x00000 through 0xfc000 in 16KB steps.
 367  *
 368  * The Network components are: dual ported RAM, Prom, I/O Reg, Status-,
 369  * Controlregister and I/O Command.
 370  *
 371  * dual ported RAM: This is the only memory region which the LANCE chip
 372  *      has access to. From the Lance it is addressed from 0x0000 to
 373  *      0x3fbf. The host accesses it normally.
 374  *
 375  * PROM: The PROM obtains the ETHERNET-MAC-Address. It is realised as a
 376  *       8-Bit PROM, this means only the 16 even addresses are used of the
 377  *       32 Byte Address region. Access to a odd address results in invalid
 378  *       data.
 379  *
 380  * LANCE I/O Reg: The I/O Reg is build of 4 single Registers, Low-Byte Write,
 381  *       Hi-Byte Write, Low-Byte Read, Hi-Byte Read.
 382  *       Transfer from or to the LANCE is always in 16Bit so Low and High
 383  *       registers are always relevant.
 384  *
 385  *       The Data from the Readregister is not the data in the Writeregister!!
 386  *
 387  * Port: Status- and Controlregister.
 388  *       Two different registers which share the same address, Status is
 389  *       read-only, Control is write-only.
 390  *
 391  * I/O Command:
 392  *       Any bitcombination written in here starts the transmission between
 393  *       Host and LANCE.
 394  */
 395
 396 typedef struct
 397 {
 398         unsigned char  ram[0x3fc0];   /* 16KB dual ported ram */
 399         unsigned char  rom[0x0020];   /* 32Byte PROM containing 6Byte MAC */
 400         unsigned char  res1[0x0010];  /* reserved */
 401         unsigned volatile short ioreg;/* LANCE I/O Register */
 402         unsigned volatile char  port; /* Statusregister and Controlregister */
 403         unsigned char  iocom;         /* I/O Command Register */
 404 } SK_RAM;
 405
 406 /* struct  */
 407
 408 /*
 409  * This is the structure for the dual ported ram. We
 410  * have exactly 16 320 Bytes. In here there must be:
 411  *
 412  *     - Initialize Block   (starting at a word boundary)
 413  *     - Receive and Transmit Descriptor Rings (quadword boundary)
 414  *     - Data Buffers (arbitrary boundary)
 415  *
 416  * This is because LANCE has on SK_G16 only access to the dual ported
 417  * RAM and nowhere else.
 418  */
 419
 420 struct SK_ram
 421 {
 422     struct init_block ib;
 423     struct tmd tmde[TMDNUM];
 424     struct rmd rmde[RMDNUM];
 425     char tmdbuf[TMDNUM][PKT_BUF_SZ];
 426     char rmdbuf[RMDNUM][PKT_BUF_SZ];
 427 };
 428
 429 /*
 430  * Structure where all necessary information is for ring buffer
 431  * management and statistics.
 432  */
 433
 434 struct priv
 435 {
 436     struct SK_ram *ram;  /* dual ported ram structure */
 437     struct rmd *rmdhead; /* start of receive ring descriptors */
 438     struct tmd *tmdhead; /* start of transmit ring descriptors */
 439     int        rmdnum;   /* actual used ring descriptor */
 440     int        tmdnum;   /* actual transmit descriptor for transmitting data */
 441     int        tmdlast;  /* last sent descriptor used for error handling, etc */
 442     void       *rmdbufs[RMDNUM]; /* pointer to the receive buffers */
 443     void       *tmdbufs[TMDNUM]; /* pointer to the transmit buffers */
 444 };
 445
 446 /* global variable declaration */
 447
 448 /* static variables */
 449
 450 static SK_RAM *board;  /* pointer to our memory mapped board components */
 451 static unsigned short   ioaddr; /* base io address */
 452 static struct priv      p_data;
 453
 454 /* Macros */
 455
 456
 457 /* Function Prototypes */
 458
 459 /*
 460  * Device Driver functions
 461  * -----------------------
 462  * See for short explanation of each function its definitions header.
 463  */
 464
 465 static int   SK_probe1(struct nic *nic, short ioaddr1);
 466
 467 static void SK_reset(struct nic *nic);
 468 static int SK_poll(struct nic *nic);
 469 static void SK_transmit(
 470 struct nic *nic,
 471 const char *d,                  /* Destination */
 472 unsigned int t,                 /* Type */
 473 unsigned int s,                 /* size */
 474 const char *p);                 /* Packet */
 475 static void SK_disable(struct nic *nic);
 476 struct nic *SK_probe(struct nic *nic, unsigned short *probe_addrs);
 477
 478 /*
 479  * LANCE Functions
 480  * ---------------
 481  */
 482
 483 static int SK_lance_init(struct nic *nic, unsigned short mode);
 484 static void SK_reset_board(void);
 485 static void SK_set_RAP(int reg_number);
 486 static int SK_read_reg(int reg_number);
 487 static int SK_rread_reg(void);
 488 static void SK_write_reg(int reg_number, int value);
 489
 490 /*
 491  * Debugging functions
 492  * -------------------
 493  */
 494
 495 static void SK_print_pos(struct nic *nic, char *text);
 496 static void SK_print_ram(struct nic *nic);
 497
 498
 499 /**************************************************************************
 500 RESET - Reset adapter
 501 ***************************************************************************/
 502 static void SK_reset(struct nic *nic)
 503 {
 504         /* put the card in its initial state */
 505         SK_lance_init(nic, MODE_NORMAL);
 506 }
 507
 508 /**************************************************************************
 509 POLL - Wait for a frame
 510 ***************************************************************************/
 511 static int SK_poll(struct nic *nic)
 512 {
 513         /* return true if there's an ethernet packet ready to read */
 514         struct priv *p;         /* SK_G16 private structure */
 515         struct rmd *rmdp;
 516         int csr0, rmdstat, packet_there;
 517     PRINTF2(("## %s: At beginning of SK_poll(). CSR0: %#hX\n",
 518            SK_NAME, SK_read_reg(CSR0)));
 519
 520         p = nic->priv_data;
 521     csr0 = SK_read_reg(CSR0);      /* store register for checking */
 522
 523     /*
 524      * Acknowledge all of the current interrupt sources, disable
 525      * Interrupts (INEA = 0)
 526      */
 527
 528     SK_write_reg(CSR0, csr0 & CSR0_CLRALL);
 529
 530     if (csr0 & CSR0_ERR) /* LANCE Error */
 531     {
 532         printf("%s: error: %#hX", SK_NAME, csr0);
 533
 534         if (csr0 & CSR0_MISS)      /* No place to store packet ? */
 535         {
 536                 printf(", Packet dropped.");
 537         }
 538         putchar('\n');
 539     }
 540
 541     rmdp = p->rmdhead + p->rmdnum;
 542     packet_there = 0;
 543     /* As long as we own the next entry, check status and send
 544      * it up to higher layer
 545      */
 546
 547     while (!( (rmdstat = rmdp->u.s.status) & RX_OWN))
 548     {
 549         /*
 550          * Start and end of packet must be set, because we use
 551          * the ethernet maximum packet length (1518) as buffer size.
 552          *
 553          * Because our buffers are at maximum OFLO and BUFF errors are
 554          * not to be concerned (see Data sheet)
 555          */
 556
 557         if ((rmdstat & (RX_STP | RX_ENP)) != (RX_STP | RX_ENP))
 558         {
 559             /* Start of a frame > 1518 Bytes ? */
 560
 561             if (rmdstat & RX_STP)
 562             {
 563                 printf("%s: packet too long\n", SK_NAME);
 564             }
 565
 566             /*
 567              * All other packets will be ignored until a new frame with
 568              * start (RX_STP) set follows.
 569              *
 570              * What we do is just give descriptor free for new incoming
 571              * packets.
 572              */
 573
 574             rmdp->u.s.status = RX_OWN;      /* Relinquish ownership to LANCE */
 575
 576         }
 577         else if (rmdstat & RX_ERR)          /* Receive Error ? */
 578         {
 579             printf("%s: RX error: %#hX\n", SK_NAME, (int) rmdstat);
 580             rmdp->u.s.status = RX_OWN;      /* Relinquish ownership to LANCE */
 581         }
 582         else /* We have a packet which can be queued for the upper layers */
 583         {
 584
 585             int len = (rmdp->mlen & 0x0fff);  /* extract message length from receive buffer */
 586
 587             /*
 588              * Copy data out of our receive descriptor into nic->packet.
 589              *
 590              * (rmdp->u.buffer & 0x00ffffff) -> get address of buffer and
 591              * ignore status fields)
 592              */
 593
 594             memcpy(nic->packet, (unsigned char *) (rmdp->u.buffer & 0x00ffffff), nic->packetlen = len);
 595             packet_there = 1;
 596
 597
 598             /*
 599              * Packet is queued and marked for processing so we
 600              * free our descriptor
 601              */
 602
 603             rmdp->u.s.status = RX_OWN;
 604
 605             p->rmdnum++;
 606             p->rmdnum %= RMDNUM;
 607
 608             rmdp = p->rmdhead + p->rmdnum;
 609         }
 610     }
 611     SK_write_reg(CSR0, CSR0_INEA); /* Enable Interrupts */
 612         return (packet_there);
 613 }
 614
 615 /**************************************************************************
 616 TRANSMIT - Transmit a frame
 617 ***************************************************************************/
 618 static void SK_transmit(
 619 struct nic *nic,
 620 const char *d,                  /* Destination */
 621 unsigned int t,                 /* Type */
 622 unsigned int s,                 /* size */
 623 const char *pack)               /* Packet */
 624 {
 625         /* send the packet to destination */
 626     struct priv *p;         /* SK_G16 private structure */
 627     struct tmd *tmdp;
 628     short len;
 629     int csr0, i, tmdstat;
 630
 631     PRINTF2(("## %s: At beginning of SK_transmit(). CSR0: %#hX\n",
 632            SK_NAME, SK_read_reg(CSR0)));
 633         p = nic->priv_data;
 634         tmdp = p->tmdhead + p->tmdnum; /* Which descriptor for transmitting */
 635
 636         /* Copy data into dual ported ram */
 637
 638         memcpy(&p->ram->tmdbuf[p->tmdnum][0], d, ETH_ALEN);     /* dst */
 639         memcpy(&p->ram->tmdbuf[p->tmdnum][ETH_ALEN], nic->node_addr, ETH_ALEN); /* src */
 640         p->ram->tmdbuf[p->tmdnum][ETH_ALEN + ETH_ALEN] = t >> 8;        /* type */
 641         p->ram->tmdbuf[p->tmdnum][ETH_ALEN + ETH_ALEN + 1] = t; /* type */
 642         memcpy(&p->ram->tmdbuf[p->tmdnum][ETH_HLEN], pack, s);
 643         s += ETH_HLEN;
 644         while (s < ETH_ZLEN)    /* pad to min length */
 645                 p->ram->tmdbuf[p->tmdnum][s++] = 0;
 646         p->ram->tmde[p->tmdnum].status2 = 0x0;
 647
 648         /* Evaluate Packet length */
 649         len = ETH_ZLEN < s ? s : ETH_ZLEN;
 650
 651         /* Fill in Transmit Message Descriptor */
 652
 653         tmdp->blen = -len;            /* set length to transmit */
 654
 655         /*
 656          * Packet start and end is always set because we use the maximum
 657          * packet length as buffer length.
 658          * Relinquish ownership to LANCE
 659          */
 660
 661         tmdp->u.s.status = TX_OWN | TX_STP | TX_ENP;
 662
 663         /* Start Demand Transmission */
 664         SK_write_reg(CSR0, CSR0_TDMD | CSR0_INEA);
 665
 666     csr0 = SK_read_reg(CSR0);      /* store register for checking */
 667
 668     /*
 669      * Acknowledge all of the current interrupt sources, disable
 670      * Interrupts (INEA = 0)
 671      */
 672
 673     SK_write_reg(CSR0, csr0 & CSR0_CLRALL);
 674
 675     if (csr0 & CSR0_ERR) /* LANCE Error */
 676     {
 677         printf("%s: error: %#hX", SK_NAME, csr0);
 678
 679         if (csr0 & CSR0_MISS)      /* No place to store packet ? */
 680         {
 681                 printf(", Packet dropped.");
 682         }
 683         putchar('\n');
 684     }
 685
 686
 687     /* Set next buffer */
 688     p->tmdlast++;
 689     p->tmdlast &= TMDNUM-1;
 690
 691     tmdstat = tmdp->u.s.status & 0xff00; /* filter out status bits 15:08 */
 692
 693     /*
 694      * We check status of transmitted packet.
 695      * see LANCE data-sheet for error explanation
 696      */
 697     if (tmdstat & TX_ERR) /* Error occurred */
 698     {
 699         printf("%s: TX error: %#hX %#hX\n", SK_NAME, (int) tmdstat,
 700                 (int) tmdp->status2);
 701
 702         if (tmdp->status2 & TX_TDR)    /* TDR problems? */
 703         {
 704             printf("%s: tdr-problems \n", SK_NAME);
 705         }
 706
 707         if (tmdp->status2 & TX_UFLO)   /* Underflow error ? */
 708         {
 709             /*
 710              * If UFLO error occurs it will turn transmitter of.
 711              * So we must reinit LANCE
 712              */
 713
 714             SK_lance_init(nic, MODE_NORMAL);
 715         }
 716
 717         tmdp->status2 = 0;             /* Clear error flags */
 718     }
 719
 720     SK_write_reg(CSR0, CSR0_INEA); /* Enable Interrupts */
 721
 722         /* Set pointer to next transmit buffer */
 723         p->tmdnum++;
 724         p->tmdnum &= TMDNUM-1;
 725
 726 }
 727
 728 /**************************************************************************
 729 DISABLE - Turn off ethernet interface
 730 ***************************************************************************/
 731 static void SK_disable(struct nic *nic)
 732 {
 733     PRINTF(("## %s: At beginning of SK_disable(). CSR0: %#hX\n",
 734            SK_NAME, SK_read_reg(CSR0)));
 735     PRINTF(("%s: Shutting %s down CSR0 %#hX\n", SK_NAME, SK_NAME,
 736            (int) SK_read_reg(CSR0)));
 737
 738     SK_write_reg(CSR0, CSR0_STOP); /* STOP the LANCE */
 739 }
 740
 741 /**************************************************************************
 742 PROBE - Look for an adapter, this routine's visible to the outside
 743 ***************************************************************************/
 744 struct nic *SK_probe(struct nic *nic, unsigned short *probe_addrs)
 745 {
 746         unsigned short          *p;
 747         static unsigned short   io_addrs[] = SK_IO_PORTS;
 748         /* if probe_addrs is 0, then routine can use a hardwired default */
 749         putchar('\n');
 750         nic->priv_data = &p_data;
 751         if (probe_addrs == 0)
 752                 probe_addrs = io_addrs;
 753         for (p = probe_addrs; (ioaddr = *p) != 0; ++p)
 754         {
 755                 long            offset1, offset0 = inb(ioaddr);
 756                 if ((offset0 == SK_IDLOW) &&
 757                  ((offset1 = inb(ioaddr + 1)) == SK_IDHIGH))
 758                         if (SK_probe1(nic, ioaddr) >= 0)
 759                                 break;
 760         }
 761         /* if board found */
 762         if (ioaddr != 0)
 763         {
 764                 /* point to NIC specific routines */
 765                 nic->reset = SK_reset;
 766                 nic->poll = SK_poll;
 767                 nic->transmit = SK_transmit;
 768                 nic->disable = SK_disable;
 769                 return nic;
 770         }
 771         /* else */
 772         {
 773                 return 0;
 774         }
 775 }
 776
 777 int SK_probe1(struct nic *nic, short ioaddr1)
 778 {
 779     int i,j;                /* Counters */
 780     int sk_addr_flag = 0;   /* SK ADDR correct? 1 - no, 0 - yes */
 781     unsigned int rom_addr;  /* used to store RAM address used for POS_ADDR */
 782
 783     struct priv *p;         /* SK_G16 private structure */
 784
 785     if (SK_ADDR & 0x3fff || SK_ADDR < 0xa0000)
 786     {
 787        /*
 788         * Now here we could use a routine which searches for a free
 789         * place in the ram and set SK_ADDR if found. TODO.
 790         */
 791             printf("%s: SK_ADDR %#hX is not valid. Check configuration.\n",
 792                     SK_NAME, SK_ADDR);
 793             return -1;
 794     }
 795
 796     rom_addr = SK_ADDR;
 797
 798     outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off */
 799     outb(POS_ADDR, SK_POS3);       /* Set RAM address */
 800     outb(SK_ROM_RAM_ON, SK_POS2);  /* RAM on, BOOT_ROM on */
 801 #ifdef  SK_DEBUG
 802     SK_print_pos(nic, "POS registers after ROM, RAM config");
 803 #endif
 804
 805     board = (SK_RAM *) rom_addr;
 806         PRINTF(("adr[0]: %hX, adr[1]: %hX, adr[2]: %hX\n",
 807         board->rom[0], board->rom[2], board->rom[4]));
 808
 809     /* Read in station address */
 810     for (i = 0, j = 0; i < ETH_ALEN; i++, j+=2)
 811     {
 812         *(nic->node_addr+i) = board->rom[j];
 813     }
 814
 815     /* Check for manufacturer code */
 816 #ifdef  SK_DEBUG
 817     if (!(*(nic->node_addr+0) == SK_MAC0 &&
 818           *(nic->node_addr+1) == SK_MAC1 &&
 819           *(nic->node_addr+2) == SK_MAC2) )
 820     {
 821         PRINTF(("## %s: We did not find SK_G16 at RAM location.\n",
 822                 SK_NAME));
 823         return -1;                     /* NO SK_G16 found */
 824     }
 825 #endif
 826
 827     p = nic->priv_data;
 828
 829     /* Initialize private structure */
 830
 831     p->ram = (struct SK_ram *) rom_addr; /* Set dual ported RAM addr */
 832     p->tmdhead = &(p->ram)->tmde[0];     /* Set TMD head */
 833     p->rmdhead = &(p->ram)->rmde[0];     /* Set RMD head */
 834
 835     printf("Schneider & Koch G16 at %#hX, mem at %#hX, HW addr: %!\n",
 836             (unsigned int) ioaddr, (unsigned int) p->ram, nic->node_addr);
 837
 838     /* Initialize buffer pointers */
 839
 840     for (i = 0; i < TMDNUM; i++)
 841     {
 842         p->tmdbufs[i] = p->ram->tmdbuf[i];
 843     }
 844
 845     for (i = 0; i < RMDNUM; i++)
 846     {
 847         p->rmdbufs[i] = p->ram->rmdbuf[i];
 848     }
 849     i = 0;
 850
 851     if (!(i = SK_lance_init(nic, MODE_NORMAL)))  /* LANCE init OK? */
 852     {
 853
 854 #ifdef  SK_DEBUG
 855         /*
 856          * This debug block tries to stop LANCE,
 857          * reinit LANCE with transmitter and receiver disabled,
 858          * then stop again and reinit with NORMAL_MODE
 859          */
 860
 861         printf("## %s: After lance init. CSR0: %#hX\n",
 862                SK_NAME, SK_read_reg(CSR0));
 863         SK_write_reg(CSR0, CSR0_STOP);
 864         printf("## %s: LANCE stopped. CSR0: %#hX\n",
 865                SK_NAME, SK_read_reg(CSR0));
 866         SK_lance_init(nic, MODE_DTX | MODE_DRX);
 867         printf("## %s: Reinit with DTX + DRX off. CSR0: %#hX\n",
 868                SK_NAME, SK_read_reg(CSR0));
 869         SK_write_reg(CSR0, CSR0_STOP);
 870         printf("## %s: LANCE stopped. CSR0: %#hX\n",
 871                SK_NAME, SK_read_reg(CSR0));
 872         SK_lance_init(nic, MODE_NORMAL);
 873         printf("## %s: LANCE back to normal mode. CSR0: %#hX\n",
 874                SK_NAME, SK_read_reg(CSR0));
 875         SK_print_pos(nic, "POS regs before returning OK");
 876
 877 #endif  /* SK_DEBUG */
 878
 879     }
 880     else /* LANCE init failed */
 881     {
 882
 883         PRINTF(("## %s: LANCE init failed: CSR0: %#hX\n",
 884                SK_NAME, SK_read_reg(CSR0)));
 885         return -1;
 886     }
 887
 888 #ifdef  SK_DEBUG
 889     SK_print_pos(nic, "End of SK_probe1");
 890     SK_print_ram(nic);
 891 #endif
 892
 893     return 0;                            /* Initialization done */
 894
 895 } /* End of SK_probe1() */
 896
 897 static int SK_lance_init(struct nic *nic, unsigned short mode)
 898 {
 899     int i;
 900     struct priv *p = (struct priv *) nic->priv_data;
 901     struct tmd  *tmdp;
 902     struct rmd  *rmdp;
 903
 904     PRINTF(("## %s: At beginning of LANCE init. CSR0: %#hX\n",
 905            SK_NAME, SK_read_reg(CSR0)));
 906
 907     /* Reset LANCE */
 908     SK_reset_board();
 909
 910     /* Initialize TMD's with start values */
 911     p->tmdnum = 0;                   /* First descriptor for transmitting */
 912     p->tmdlast = 0;                  /* First descriptor for reading stats */
 913
 914     for (i = 0; i < TMDNUM; i++)     /* Init all TMD's */
 915     {
 916         tmdp = p->tmdhead + i;
 917
 918         tmdp->u.buffer = (unsigned long) p->tmdbufs[i]; /* assign buffer */
 919
 920         /* Mark TMD as start and end of packet */
 921         tmdp->u.s.status = TX_STP | TX_ENP;
 922     }
 923
 924
 925     /* Initialize RMD's with start values */
 926
 927     p->rmdnum = 0;                   /* First RMD which will be used */
 928
 929     for (i = 0; i < RMDNUM; i++)     /* Init all RMD's */
 930     {
 931         rmdp = p->rmdhead + i;
 932
 933
 934         rmdp->u.buffer = (unsigned long) p->rmdbufs[i]; /* assign buffer */
 935
 936         /*
 937          * LANCE must be owner at beginning so that he can fill in
 938          * receiving packets, set status and release RMD
 939          */
 940
 941         rmdp->u.s.status = RX_OWN;
 942
 943         rmdp->blen = -PKT_BUF_SZ;    /* Buffer Size in a two's complement */
 944
 945         rmdp->mlen = 0;              /* init message length */
 946
 947     }
 948
 949     /* Fill LANCE Initialize Block */
 950
 951     (p->ram)->ib.mode = mode;        /* Set operation mode */
 952
 953     for (i = 0; i < ETH_ALEN; i++)   /* Set physical address */
 954     {
 955         (p->ram)->ib.paddr[i] = *(nic->node_addr+i);
 956     }
 957
 958     for (i = 0; i < 8; i++)          /* Set multicast, logical address */
 959     {
 960         (p->ram)->ib.laddr[i] = 0;   /* We do not use logical addressing */
 961     }
 962
 963     /* Set ring descriptor pointers and set number of descriptors */
 964
 965     (p->ram)->ib.rdrp = (int)  p->rmdhead | RMDNUMMASK;
 966     (p->ram)->ib.tdrp = (int)  p->tmdhead | TMDNUMMASK;
 967
 968     /* Prepare LANCE Control and Status Registers */
 969
 970     SK_write_reg(CSR3, CSR3_ACON);   /* Ale Control !!!THIS MUST BE SET!!!! */
 971
 972     /*
 973      * LANCE addresses the RAM from 0x0000 to 0x3fbf and has no access to
 974      * PC Memory locations.
 975      *
 976      * In structure SK_ram is defined that the first thing in ram
 977      * is the initialization block. So his address is for LANCE always
 978      * 0x0000
 979      *
 980      * CSR1 contains low order bits 15:0 of initialization block address
 981      * CSR2 is built of:
 982      *    7:0  High order bits 23:16 of initialization block address
 983      *   15:8  reserved, must be 0
 984      */
 985
 986     /* Set initialization block address (must be on word boundary) */
 987     SK_write_reg(CSR1, 0);          /* Set low order bits 15:0 */
 988     SK_write_reg(CSR2, 0);          /* Set high order bits 23:16 */
 989
 990
 991     PRINTF(("## %s: After setting CSR1-3. CSR0: %#hX\n",
 992            SK_NAME, SK_read_reg(CSR0)));
 993
 994     /* Initialize LANCE */
 995
 996     /*
 997      * INIT = Initialize, when set, causes the LANCE to begin the
 998      * initialization procedure and access the Init Block.
 999      */
1000
1001     SK_write_reg(CSR0, CSR0_INIT);
1002
1003     /* Wait until LANCE finished initialization */
1004
1005     SK_set_RAP(CSR0);              /* Register Address Pointer to CSR0 */
1006
1007     for (i = 0; (i < 100) && !(SK_rread_reg() & CSR0_IDON); i++)
1008         ; /* Wait until init done or go ahead if problems (i>=100) */
1009
1010     if (i >= 100) /* Something is wrong ! */
1011     {
1012         printf("%s: can't init am7990, status: %#hX "
1013                "init_block: %#hX\n",
1014                 SK_NAME, (int) SK_read_reg(CSR0),
1015                 (unsigned int) &(p->ram)->ib);
1016
1017 #ifdef  SK_DEBUG
1018         SK_print_pos(nic, "LANCE INIT failed");
1019 #endif
1020
1021         return -1;                 /* LANCE init failed */
1022     }
1023
1024     PRINTF(("## %s: init done after %d ticks\n", SK_NAME, i));
1025
1026     /* Clear Initialize done, enable Interrupts, start LANCE */
1027
1028     SK_write_reg(CSR0, CSR0_IDON | CSR0_INEA | CSR0_STRT);
1029
1030     PRINTF(("## %s: LANCE started. CSR0: %#hX\n", SK_NAME,
1031             SK_read_reg(CSR0)));
1032
1033     return 0;                      /* LANCE is up and running */
1034
1035 } /* End of SK_lance_init() */
1036
1037 /* LANCE access functions
1038  *
1039  * ! CSR1-3 can only be accessed when in CSR0 the STOP bit is set !
1040  */
1041
1042 static void SK_reset_board(void)
1043 {
1044     int i;
1045
1046         PRINTF(("## %s: At beginning of SK_reset_board.\n", SK_NAME));
1047     SK_PORT = 0x00;           /* Reset active */
1048     for (i = 0; i < 10 ; i++) /* Delay min 5ms */
1049         ;
1050     SK_PORT = SK_RESET;       /* Set back to normal operation */
1051
1052 } /* End of SK_reset_board() */
1053
1054 static void SK_set_RAP(int reg_number)
1055 {
1056     SK_IOREG = reg_number;
1057     SK_PORT  = SK_RESET | SK_RAP | SK_WREG;
1058     SK_IOCOM = SK_DOIO;
1059
1060     while (SK_PORT & SK_IORUN)
1061         ;
1062 } /* End of SK_set_RAP() */
1063
1064 static int SK_read_reg(int reg_number)
1065 {
1066     SK_set_RAP(reg_number);
1067
1068     SK_PORT  = SK_RESET | SK_RDATA | SK_RREG;
1069     SK_IOCOM = SK_DOIO;
1070
1071     while (SK_PORT & SK_IORUN)
1072         ;
1073     return (SK_IOREG);
1074
1075 } /* End of SK_read_reg() */
1076
1077 static int SK_rread_reg(void)
1078 {
1079     SK_PORT  = SK_RESET | SK_RDATA | SK_RREG;
1080
1081     SK_IOCOM = SK_DOIO;
1082
1083     while (SK_PORT & SK_IORUN)
1084         ;
1085     return (SK_IOREG);
1086
1087 } /* End of SK_rread_reg() */
1088
1089 static void SK_write_reg(int reg_number, int value)
1090 {
1091     SK_set_RAP(reg_number);
1092
1093     SK_IOREG = value;
1094     SK_PORT  = SK_RESET | SK_RDATA | SK_WREG;
1095     SK_IOCOM = SK_DOIO;
1096
1097     while (SK_PORT & SK_IORUN)
1098         ;
1099 } /* End of SK_write_reg */
1100
1101 /*
1102  * Debugging functions
1103  * -------------------
1104  */
1105
1106 #ifdef  SK_DEBUG
1107 static void SK_print_pos(struct nic *nic, char *text)
1108 {
1109
1110     unsigned char pos0 = inb(SK_POS0),
1111                   pos1 = inb(SK_POS1),
1112                   pos2 = inb(SK_POS2),
1113                   pos3 = inb(SK_POS3),
1114                   pos4 = inb(SK_POS4);
1115
1116
1117     printf("## %s: %s.\n"
1118            "##   pos0=%#hX pos1=%#hX pos2=%#hX pos3=%#hX pos4=%#hX\n",
1119            SK_NAME, text, pos0, pos1, pos2, (pos3<<14), pos4);
1120
1121 } /* End of SK_print_pos() */
1122
1123 static void SK_print_ram(struct nic *nic)
1124 {
1125
1126     int i;
1127     struct priv *p = (struct priv *) nic->priv_data;
1128
1129     printf("## %s: RAM Details.\n"
1130            "##   RAM at %#hX tmdhead: %#hX rmdhead: %#hX initblock: %#hX\n",
1131            SK_NAME,
1132            (unsigned int) p->ram,
1133            (unsigned int) p->tmdhead,
1134            (unsigned int) p->rmdhead,
1135            (unsigned int) &(p->ram)->ib);
1136
1137     printf("##   ");
1138
1139     for(i = 0; i < TMDNUM; i++)
1140     {
1141            if (!(i % 3)) /* Every third line do a newline */
1142            {
1143                printf("\n##   ");
1144            }
1145         printf("tmdbufs%d: %#hX ", (i+1), (int) p->tmdbufs[i]);
1146     }
1147     printf("##   ");
1148
1149     for(i = 0; i < RMDNUM; i++)
1150     {
1151          if (!(i % 3)) /* Every third line do a newline */
1152            {
1153                printf("\n##   ");
1154            }
1155         printf("rmdbufs%d: %#hX ", (i+1), (int) p->rmdbufs[i]);
1156     }
1157     putchar('\n');
1158
1159 } /* End of SK_print_ram() */
1160 #endif