root/drivers/net/sk_g16.c

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DEFINITIONS

This source file includes following definitions.
  1. SK_init
  2. SK_probe
  3. SK_open
  4. SK_lance_init
  5. SK_send_packet
  6. SK_interrupt
  7. SK_txintr
  8. SK_rxintr
  9. SK_close
  10. SK_get_stats
  11. set_multicast_list
  12. SK_rom_addr
  13. SK_reset_board
  14. SK_set_RAP
  15. SK_read_reg
  16. SK_rread_reg
  17. SK_write_reg
  18. SK_print_pos
  19. SK_print_dev
  20. SK_print_ram

   1 /*-
   2  * Copyright (C) 1994 by PJD Weichmann & SWS Bern, Switzerland
   3  *
   4  * This software may be used and distributed according to the terms
   5  * of the GNU Public License, incorporated herein by reference.
   6  *
   7  * Module         : sk_g16.c
   8  *
   9  * Version        : $Revision: 1.1 $
  10  *
  11  * Author         : Patrick J.D. Weichmann
  12  *
  13  * Date Created   : 94/05/26
  14  * Last Updated   : $Date: 1994/06/30 16:25:15 $
  15  *
  16  * Description    : Schneider & Koch G16 Ethernet Device Driver for
  17  *                  Linux Kernel >= 1.1.22
  18  * Update History :
  19  *
  20 -*/
  21 
  22 static const char *rcsid = "$Id: sk_g16.c,v 1.1 1994/06/30 16:25:15 root Exp $";
  23 
  24 /*
  25  * The Schneider & Koch (SK) G16 Network device driver is based
  26  * on the 'ni6510' driver from Michael Hipp which can be found at
  27  * ftp://sunsite.unc.edu/pub/Linux/system/Network/drivers/nidrivers.tar.gz
  28  * 
  29  * Sources: 1) ni6510.c by M. Hipp
  30  *          2) depca.c  by D.C. Davies
  31  *          3) skeleton.c by D. Becker
  32  *          4) Am7990 Local Area Network Controller for Ethernet (LANCE),
  33  *             AMD, Pub. #05698, June 1989
  34  *
  35  * Many Thanks for helping me to get things working to: 
  36  *                 
  37  *                 A. Cox (A.Cox@swansea.ac.uk)
  38  *                 M. Hipp (mhipp@student.uni-tuebingen.de)
  39  *                 R. Bolz (Schneider & Koch, Germany)
  40  *
  41  * See README.sk_g16 for details about limitations and bugs for the
  42  * current version.
  43  *
  44  * To Do: 
  45  *        - Support of SK_G8 and other SK Network Cards.
  46  *        - Autoset memory mapped RAM. Check for free memory and then
  47  *          configure RAM correctly. 
  48  *        - SK_close should really set card in to initial state.
  49  *        - Test if IRQ 3 is not switched off. Use autoirq() functionality.
  50  *          (as in /drivers/net/skeleton.c)
  51  *        - Implement Multicast addressing. At minimum something like
  52  *          in depca.c. 
  53  *        - Redo the statistics part.
  54  *        - Try to find out if the board is in 8 Bit or 16 Bit slot.
  55  *          If in 8 Bit mode don't use IRQ 11.
  56  *        - (Try to make it slightly faster.) 
  57  */
  58 
  59 #include <linux/kernel.h>
  60 #include <linux/sched.h>
  61 #include <linux/ptrace.h>
  62 #include <linux/fcntl.h>
  63 #include <linux/ioport.h>
  64 #include <linux/interrupt.h>
  65 #include <linux/malloc.h>
  66 #include <linux/ioport.h>
  67 #include <linux/string.h> 
  68 #include <asm/system.h>
  69 #include <asm/io.h>
  70 #include <asm/bitops.h> 
  71 #include <linux/errno.h>
  72 
  73 #include <linux/netdevice.h>
  74 #include <linux/etherdevice.h>
  75 #include <linux/skbuff.h>
  76 
  77 #include "sk_g16.h"
  78 
  79 /* 
  80  * Schneider & Koch Card Definitions 
  81  * =================================
  82  */  
  83 
  84 #define SK_NAME   "SK_G16"
  85 
  86 /*
  87  * SK_G16 Configuration
  88  * --------------------
  89  */ 
  90 
  91 /* 
  92  * Abbreviations
  93  * -------------
  94  *  
  95  * RAM - used for the 16KB shared memory 
  96  * Boot_ROM, ROM - are used for referencing the BootEPROM
  97  *
  98  * SK_BOOT_ROM and SK_ADDR are symbolic constants used to configure
  99  * the behaviour of the driver and the SK_G16.
 100  *
 101  * ! See sk_g16.install on how to install and configure the driver !   
 102  *
 103  * SK_BOOT_ROM defines if the Boot_ROM should be switched off or not.
 104  *
 105  * SK_ADDR defines the address where the RAM will be mapped into the real
 106  *         host memory.
 107  *         valid addresses are from 0xa0000 to 0xfc000 in 16Kbyte steps.
 108  */  
 109  
 110 #define SK_BOOT_ROM     1              /* 1=BootROM on 0=off */
 111 
 112 #define SK_ADDR         0xcc000
 113 
 114 /* 
 115  * In POS3 are bits A14-A19 of the address bus. These bits can be set
 116  * to choose the RAM address. Thats why we only can choose the RAM address
 117  * in 16KB steps.
 118  */
 119 
 120 #define POS_ADDR       (rom_addr>>14)  /* Do not change this line */
 121 
 122 /* 
 123  * SK_G16 I/O PORT's + IRQ's + Boot_ROM locations
 124  * ----------------------------------------------
 125  */
 126 
 127 /* 
 128  * As nearly every card has also SK_G16 a specified I/O Port region and
 129  * only a few possible IRQ's.
 130  * In the Installation Guide from Schneider & Koch is listed a possible
 131  * Interrupt IRQ2. IRQ2 is always IRQ9 in boards with two cascaded interrupt
 132  * controllers. So we use in SK_IRQS IRQ9.
 133  */
 134 
 135 /* Don't touch any of the following #defines. */
 136 
 137 #define SK_IO_PORTS     { 0x100, 0x180, 0x208, 0x220, 0x288, 0x320, 0x328, 0x390, 0 }
 138 
 139 #define SK_IRQS         { 3, 5, 9, 11, 0 }
 140 
 141 #define SK_BOOT_ROM_LOCATIONS { 0xc0000, 0xc4000, 0xc8000, 0xcc000, 0xd0000, 0xd4000, 0xd8000, 0xdc000, 0 }
 142 
 143 #define SK_BOOT_ROM_ID  { 0x55, 0xaa, 0x10, 0x50, 0x06, 0x33 }
 144 
 145 /* 
 146  * SK_G16 POS REGISTERS 
 147  * --------------------
 148  */
 149 
 150 /*
 151  * SK_G16 has a Programmable Option Select (POS) Register.
 152  * The POS is composed of 8 separate registers (POS0-7) which 
 153  * are I/O mapped on an address set by the W1 switch.                    
 154  *
 155  */
 156 
 157 #define SK_POS_SIZE 8           /* 8 I/O Ports are used by SK_G16 */
 158 
 159 #define SK_POS0     ioaddr      /* Card-ID Low (R) */
 160 #define SK_POS1     ioaddr+1    /* Card-ID High (R) */
 161 #define SK_POS2     ioaddr+2    /* Card-Enable, Boot-ROM Disable (RW) */
 162 #define SK_POS3     ioaddr+3    /* Base address of RAM */
 163 #define SK_POS4     ioaddr+4    /* IRQ */
 164 
 165 /* POS5 - POS7 are unused */
 166 
 167 /* 
 168  * SK_G16 MAC PREFIX 
 169  * -----------------
 170  */
 171 
 172 /* 
 173  * Scheider & Koch manufacturer code (00:00:a5).
 174  * This must be checked, that we are sure it is a SK card.
 175  */
 176 
 177 #define SK_MAC0         0x00
 178 #define SK_MAC1         0x00
 179 #define SK_MAC2         0x5a
 180 
 181 /* 
 182  * SK_G16 ID 
 183  * ---------
 184  */ 
 185 
 186 /* 
 187  * If POS0,POS1 contain the following ID, then we know
 188  * at which I/O Port Address we are. 
 189  */
 190 
 191 #define SK_IDLOW  0xfd 
 192 #define SK_IDHIGH 0x6a
 193 
 194 
 195 /* 
 196  * LANCE POS Bit definitions 
 197  * -------------------------
 198  */
 199 
 200 #define SK_ROM_RAM_ON  (POS2_CARD)
 201 #define SK_ROM_RAM_OFF (POS2_EPROM)
 202 #define SK_ROM_ON      (inb(SK_POS2) & POS2_CARD)
 203 #define SK_ROM_OFF     (inb(SK_POS2) | POS2_EPROM)
 204 #define SK_RAM_ON      (inb(SK_POS2) | POS2_CARD)
 205 #define SK_RAM_OFF     (inb(SK_POS2) & POS2_EPROM) 
 206 
 207 #define POS2_CARD  0x0001              /* 1 = SK_G16 on      0 = off */
 208 #define POS2_EPROM 0x0002              /* 1 = Boot EPROM off 0 = on */ 
 209 
 210 /* 
 211  * SK_G16 Memory mapped Registers
 212  * ------------------------------
 213  *
 214  */ 
 215 
 216 #define SK_IOREG        (board->ioreg) /* LANCE data registers.     */ 
 217 #define SK_PORT         (board->port)  /* Control, Status register  */
 218 #define SK_IOCOM        (board->iocom) /* I/O Command               */
 219 
 220 /* 
 221  * SK_G16 Status/Control Register bits
 222  * -----------------------------------
 223  *
 224  * (C) Controlreg (S) Statusreg 
 225  */
 226 
 227 /* 
 228  * Register transfer: 0 = no transfer
 229  *                    1 = transferring data between LANCE and I/O reg 
 230  */
 231 #define SK_IORUN        0x20   
 232 
 233 /* 
 234  * LANCE interrupt: 0 = LANCE interrupt occurred        
 235  *                  1 = no LANCE interrupt occurred
 236  */
 237 #define SK_IRQ          0x10   
 238                         
 239 #define SK_RESET        0x08   /* Reset SK_CARD: 0 = RESET 1 = normal */
 240 #define SK_RW           0x02   /* 0 = write to 1 = read from */
 241 #define SK_ADR          0x01   /* 0 = REG DataPort 1 = RAP Reg addr port */
 242 
 243   
 244 #define SK_RREG         SK_RW  /* Transferdirection to read from lance */
 245 #define SK_WREG         0      /* Transferdirection to write to lance */
 246 #define SK_RAP          SK_ADR /* Destination Register RAP */
 247 #define SK_RDATA        0      /* Destination Register REG DataPort */
 248 
 249 /* 
 250  * SK_G16 I/O Command 
 251  * ------------------
 252  */
 253 
 254 /* 
 255  * Any bitcombination sets the internal I/O bit (transfer will start) 
 256  * when written to I/O Command
 257  */
 258 
 259 #define SK_DOIO         0x80   /* Do Transfer */ 
 260  
 261 /* 
 262  * LANCE RAP (Register Address Port). 
 263  * ---------------------------------
 264  */
 265 
 266 /*   
 267  * The LANCE internal registers are selected through the RAP. 
 268  * The Registers are:
 269  *
 270  * CSR0 - Status and Control flags 
 271  * CSR1 - Low order bits of initialize block (bits 15:00)
 272  * CSR2 - High order bits of initialize block (bits 07:00, 15:08 are reserved)
 273  * CSR3 - Allows redefinition of the Bus Master Interface.
 274  *        This register must be set to 0x0002, which means BSWAP = 0,
 275  *        ACON = 1, BCON = 0;
 276  *
 277  */
 278  
 279 #define CSR0            0x00   
 280 #define CSR1            0x01  
 281 #define CSR2            0x02 
 282 #define CSR3            0x03
 283 
 284 /* 
 285  * General Definitions 
 286  * ===================
 287  */
 288 
 289 /* 
 290  * Set the number of Tx and Rx buffers, using Log_2(# buffers).
 291  * We have 16KB RAM which can be accessed by the LANCE. In the 
 292  * memory are not only the buffers but also the ring descriptors and
 293  * the initialize block. 
 294  * Don't change anything unless you really know what you do.
 295  */
 296 
 297 #define LC_LOG_TX_BUFFERS 1               /* (2 == 2^^1) 2 Transmit buffers */
 298 #define LC_LOG_RX_BUFFERS 3               /* (8 == 2^^3) 8 Receive buffers */
 299 
 300 /* Descriptor ring sizes */
 301 
 302 #define TMDNUM (1 << (LC_LOG_TX_BUFFERS)) /* 2 Transmit descriptor rings */
 303 #define RMDNUM (1 << (LC_LOG_RX_BUFFERS)) /* 8 Receive Buffers */
 304 
 305 /* Define Mask for setting RMD, TMD length in the LANCE init_block */
 306 
 307 #define TMDNUMMASK (LC_LOG_TX_BUFFERS << 29)
 308 #define RMDNUMMASK (LC_LOG_RX_BUFFERS << 29)
 309 
 310 /*
 311  * Data Buffer size is set to maximum packet length.
 312  */
 313 
 314 #define PKT_BUF_SZ              1518 
 315 
 316 /* 
 317  * The number of low I/O ports used by the ethercard. 
 318  */
 319 
 320 #define ETHERCARD_TOTAL_SIZE    SK_POS_SIZE
 321 
 322 /* 
 323  * Portreserve is there to mark the Card I/O Port region as used. 
 324  * Check_region is to check if the region at ioaddr with the size "size" 
 325  * is free or not.
 326  * Snarf_region allocates the I/O Port region.
 327  */
 328 
 329 #ifndef HAVE_PORTRESERVE
 330 
 331 #define check_region(ioaddr, size)              0
 332 #define request_region(ioaddr, size,name)       do ; while (0)
 333 
 334 #endif
 335 
 336 /* 
 337  * SK_DEBUG
 338  *
 339  * Here you can choose what level of debugging wanted.
 340  *
 341  * If SK_DEBUG and SK_DEBUG2 are undefined, then only the
 342  *  necessary messages will be printed.
 343  *
 344  * If SK_DEBUG is defined, there will be many debugging prints
 345  *  which can help to find some mistakes in configuration or even
 346  *  in the driver code.
 347  *
 348  * If SK_DEBUG2 is defined, many many messages will be printed 
 349  *  which normally you don't need. I used this to check the interrupt
 350  *  routine. 
 351  *
 352  * (If you define only SK_DEBUG2 then only the messages for 
 353  *  checking interrupts will be printed!)
 354  *
 355  * Normal way of live is: 
 356  *
 357  * For the whole thing get going let both symbolic constants
 358  * undefined. If you face any problems and you know what's going
 359  * on (you know something about the card and you can interpret some
 360  * hex LANCE register output) then define SK_DEBUG
 361  * 
 362  */
 363 
 364 #undef  SK_DEBUG        /* debugging */
 365 #undef  SK_DEBUG2       /* debugging with more verbose report */
 366 
 367 #ifdef SK_DEBUG
 368 #define PRINTK(x) printk x
 369 #else
 370 #define PRINTK(x) /**/
 371 #endif
 372 
 373 #ifdef SK_DEBUG2
 374 #define PRINTK2(x) printk x
 375 #else
 376 #define PRINTK2(x) /**/
 377 #endif
 378 
 379 /* 
 380  * SK_G16 RAM
 381  *
 382  * The components are memory mapped and can be set in a region from
 383  * 0x00000 through 0xfc000 in 16KB steps. 
 384  *
 385  * The Network components are: dual ported RAM, Prom, I/O Reg, Status-,
 386  * Controlregister and I/O Command.
 387  *
 388  * dual ported RAM: This is the only memory region which the LANCE chip
 389  *      has access to. From the Lance it is addressed from 0x0000 to
 390  *      0x3fbf. The host accesses it normally.
 391  *
 392  * PROM: The PROM obtains the ETHERNET-MAC-Address. It is realised as a
 393  *       8-Bit PROM, this means only the 16 even addresses are used of the
 394  *       32 Byte Address region. Access to a odd address results in invalid
 395  *       data.
 396  * 
 397  * LANCE I/O Reg: The I/O Reg is build of 4 single Registers, Low-Byte Write,
 398  *       Hi-Byte Write, Low-Byte Read, Hi-Byte Read.
 399  *       Transfer from or to the LANCE is always in 16Bit so Low and High
 400  *       registers are always relevant.
 401  *
 402  *       The Data from the Readregister is not the data in the Writeregister!!
 403  *       
 404  * Port: Status- and Controlregister. 
 405  *       Two different registers which share the same address, Status is 
 406  *       read-only, Control is write-only.
 407  *    
 408  * I/O Command: 
 409  *       Any bitcombination written in here starts the transmission between
 410  *       Host and LANCE.
 411  */
 412 
 413 typedef struct
 414 {
 415         unsigned char  ram[0x3fc0];   /* 16KB dual ported ram */
 416         unsigned char  rom[0x0020];   /* 32Byte PROM containing 6Byte MAC */
 417         unsigned char  res1[0x0010];  /* reserved */
 418         unsigned volatile short ioreg;/* LANCE I/O Register */
 419         unsigned volatile char  port; /* Statusregister and Controlregister */
 420         unsigned char  iocom;         /* I/O Command Register */
 421 } SK_RAM;
 422 
 423 /* struct  */
 424 
 425 /* 
 426  * This is the structure for the dual ported ram. We
 427  * have exactly 16 320 Bytes. In here there must be:
 428  *
 429  *     - Initialize Block   (starting at a word boundary)
 430  *     - Receive and Transmit Descriptor Rings (quadword boundary)
 431  *     - Data Buffers (arbitrary boundary)
 432  *
 433  * This is because LANCE has on SK_G16 only access to the dual ported
 434  * RAM and nowhere else.
 435  */
 436 
 437 struct SK_ram
 438 {
 439     struct init_block ib;
 440     struct tmd tmde[TMDNUM];
 441     struct rmd rmde[RMDNUM];
 442     char tmdbuf[TMDNUM][PKT_BUF_SZ];
 443     char rmdbuf[RMDNUM][PKT_BUF_SZ];
 444 };
 445 
 446 /* 
 447  * Structure where all necessary information is for ring buffer 
 448  * management and statistics.
 449  */
 450 
 451 struct priv
 452 {
 453     struct SK_ram *ram;  /* dual ported ram structure */
 454     struct rmd *rmdhead; /* start of receive ring descriptors */
 455     struct tmd *tmdhead; /* start of transmit ring descriptors */
 456     int        rmdnum;   /* actual used ring descriptor */
 457     int        tmdnum;   /* actual transmit descriptor for transmitting data */
 458     int        tmdlast;  /* last sent descriptor used for error handling, etc */
 459     void       *rmdbufs[RMDNUM]; /* pointer to the receive buffers */
 460     void       *tmdbufs[TMDNUM]; /* pointer to the transmit buffers */
 461     struct enet_statistics stats; /* Device driver statistics */
 462 };
 463 
 464 /* global variable declaration */
 465 
 466 /* IRQ map used to reserve a IRQ (see SK_open()) */
 467 
 468 /* extern void *irq2dev_map[16]; */ /* Declared in <linux/ioport.h> */
 469 
 470 /* static variables */
 471 
 472 static SK_RAM *board;  /* pointer to our memory mapped board components */
 473 
 474 /* Macros */
 475 
 476 
 477 /* Function Prototypes */
 478 
 479 /*
 480  * Device Driver functions
 481  * -----------------------
 482  * See for short explanation of each function its definitions header.
 483  */
 484 
 485 int          SK_init(struct device *dev);
 486 static int   SK_probe(struct device *dev, short ioaddr);
 487 
 488 static int   SK_open(struct device *dev);
 489 static int   SK_send_packet(struct sk_buff *skb, struct device *dev);
 490 static void  SK_interrupt(int irq, struct pt_regs * regs);
 491 static void  SK_rxintr(struct device *dev);
 492 static void  SK_txintr(struct device *dev);
 493 static int   SK_close(struct device *dev);
 494 
 495 static struct enet_statistics *SK_get_stats(struct device *dev);
 496 
 497 unsigned int SK_rom_addr(void);
 498 
 499 static void set_multicast_list(struct device *dev);
 500 
 501 /*
 502  * LANCE Functions
 503  * ---------------
 504  */
 505 
 506 static int SK_lance_init(struct device *dev, unsigned short mode);
 507 void   SK_reset_board(void);
 508 void   SK_set_RAP(int reg_number);
 509 int    SK_read_reg(int reg_number);
 510 int    SK_rread_reg(void);
 511 void   SK_write_reg(int reg_number, int value);
 512 
 513 /* 
 514  * Debugging functions
 515  * -------------------
 516  */
 517 
 518 void SK_print_pos(struct device *dev, char *text);
 519 void SK_print_dev(struct device *dev, char *text);
 520 void SK_print_ram(struct device *dev);
 521 
 522 
 523 /*-
 524  * Function       : SK_init
 525  * Author         : Patrick J.D. Weichmann
 526  * Date Created   : 94/05/26
 527  *
 528  * Description    : Check for a SK_G16 network adaptor and initialize it.
 529  *                  This function gets called by dev_init which initializes
 530  *                  all Network devices.
 531  *
 532  * Parameters     : I : struct device *dev - structure preconfigured 
 533  *                                           from Space.c
 534  * Return Value   : 0 = Driver Found and initialized 
 535  * Errors         : ENODEV - no device found
 536  *                  ENXIO  - not probed
 537  * Globals        : None
 538  * Update History :
 539  *     YY/MM/DD  uid  Description
 540 -*/
 541 
 542 /* 
 543  * Check for a network adaptor of this type, and return '0' if one exists.
 544  * If dev->base_addr == 0, probe all likely locations.
 545  * If dev->base_addr == 1, always return failure.
 546  * If dev->base_addr == 2, allocate space for the device and return success
 547  *                         (detachable devices only).
 548  */
 549 
 550 int SK_init(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 551 {
 552         int ioaddr         = 0;            /* I/O port address used for POS regs */
 553         int *port, ports[] = SK_IO_PORTS;  /* SK_G16 supported ports */
 554 
 555         /* get preconfigured base_addr from dev which is done in Space.c */
 556         int base_addr = dev->base_addr; 
 557 
 558         PRINTK(("%s: %s", SK_NAME, rcsid));
 559         rcsid = NULL;                 /* We do not want to use this further */
 560 
 561         if (base_addr > 0x0ff)        /* Check a single specified address */
 562         {
 563             /* Check if on specified address is a SK_G16 */
 564 
 565             if ( (inb(SK_POS0) == SK_IDLOW) ||
 566                  (inb(SK_POS1) == SK_IDHIGH) )  
 567             {
 568                 return SK_probe(dev, base_addr);  
 569             }
 570 
 571             return ENODEV;            /* Sorry, but on specified address NO SK_G16 */
 572         }
 573         else if (base_addr > 0)       /* Don't probe at all */
 574         {
 575                 return ENXIO;
 576         }
 577 
 578         /* Autoprobe base_addr */
 579 
 580         for (port = &ports[0]; *port; port++) 
 581         {
 582             ioaddr = *port;           /* we need ioaddr for accessing POS regs */
 583 
 584             /* Check if I/O Port region is used by another board */
 585 
 586             if (check_region(ioaddr, ETHERCARD_TOTAL_SIZE))
 587             {
 588                 continue;             /* Try next Port address */
 589             }
 590 
 591             /* Check if at ioaddr is a SK_G16 */
 592 
 593             if ( !(inb(SK_POS0) == SK_IDLOW) ||
 594                  !(inb(SK_POS1) == SK_IDHIGH) )
 595             {
 596                 continue;             /* Try next Port address */
 597             }
 598 
 599             dev->base_addr = ioaddr;  /* Set I/O Port Address */
 600 
 601             if (SK_probe(dev, ioaddr) == 0)  
 602             {
 603                 return 0; /* Card found and initialized */
 604             }
 605         }
 606 
 607         dev->base_addr = base_addr;   /* Write back original base_addr */
 608 
 609         return ENODEV;                /* Failed to find or init driver */
 610 
 611 } /* End of SK_init */
 612 
 613 
 614 /*-
 615  * Function       : SK_probe
 616  * Author         : Patrick J.D. Weichmann
 617  * Date Created   : 94/05/26
 618  *
 619  * Description    : This function is called by SK_init and 
 620  *                  does the main part of initialization.
 621  *                  
 622  * Parameters     : I : struct device *dev - SK_G16 device structure
 623  *                  I : short ioaddr       - I/O Port address where POS is.
 624  * Return Value   : 0 = Initialization done             
 625  * Errors         : ENODEV - No SK_G16 found
 626  *                  -1     - Configuration problem
 627  * Globals        : irq2dev_map - Which device uses which IRQ
 628  *                : board       - pointer to SK_RAM
 629  * Update History :
 630  *     YY/MM/DD  uid  Description
 631  *     94/06/30  pwe  SK_ADDR now checked and at the correct place
 632 -*/
 633 
 634 int SK_probe(struct device *dev, short ioaddr)
     /* [previous][next][first][last][top][bottom][index][help] */
 635 {
 636     int i,j;                /* Counters */
 637     int sk_addr_flag = 0;   /* SK ADDR correct? 1 - no, 0 - yes */
 638     unsigned int rom_addr;  /* used to store RAM address used for POS_ADDR */
 639 
 640     struct priv *p;         /* SK_G16 private structure */
 641 
 642     if (SK_ADDR & 0x3fff || SK_ADDR < 0xa0000)
 643     {
 644       
 645        sk_addr_flag = 1;
 646 
 647        /* 
 648         * Now here we could use a routine which searches for a free
 649         * place in the ram and set SK_ADDR if found. TODO. 
 650         */
 651     }
 652 
 653     if (SK_BOOT_ROM)            /* Shall we keep Boot_ROM on ? */
 654     {
 655         PRINTK(("## %s: SK_BOOT_ROM is set.\n", SK_NAME));
 656 
 657         rom_addr = SK_rom_addr();
 658 
 659         if (rom_addr == 0)      /* No Boot_ROM found */
 660         {
 661             if (sk_addr_flag)   /* No or Invalid SK_ADDR is defined */ 
 662             {
 663                 printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
 664                        dev->name, SK_ADDR);
 665                 return -1;
 666             }
 667 
 668             rom_addr = SK_ADDR; /* assign predefined address */
 669 
 670             PRINTK(("## %s: NO Bootrom found \n", SK_NAME));
 671 
 672             outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off */
 673             outb(POS_ADDR, SK_POS3);       /* Set RAM address */
 674             outb(SK_RAM_ON, SK_POS2);      /* enable RAM */
 675         }
 676         else if (rom_addr == SK_ADDR) 
 677         {
 678             printk("%s: RAM + ROM are set to the same address %#08x\n"
 679                    "   Check configuration. Now switching off Boot_ROM\n",
 680                    SK_NAME, rom_addr);
 681 
 682             outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off*/
 683             outb(POS_ADDR, SK_POS3);       /* Set RAM address */
 684             outb(SK_RAM_ON, SK_POS2);      /* enable RAM */
 685         }
 686         else
 687         {
 688             PRINTK(("## %s: Found ROM at %#08x\n", SK_NAME, rom_addr));
 689             PRINTK(("## %s: Keeping Boot_ROM on\n", SK_NAME));
 690 
 691             if (sk_addr_flag)       /* No or Invalid SK_ADDR is defined */ 
 692             {
 693                 printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
 694                        dev->name, SK_ADDR);
 695                 return -1;
 696             }
 697 
 698             rom_addr = SK_ADDR;
 699 
 700             outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off */ 
 701             outb(POS_ADDR, SK_POS3);       /* Set RAM address */
 702             outb(SK_ROM_RAM_ON, SK_POS2);  /* RAM on, BOOT_ROM on */
 703         }
 704     }
 705     else /* Don't keep Boot_ROM */
 706     {
 707         PRINTK(("## %s: SK_BOOT_ROM is not set.\n", SK_NAME));
 708 
 709         if (sk_addr_flag)           /* No or Invalid SK_ADDR is defined */ 
 710         {
 711             printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
 712                    dev->name, SK_ADDR);
 713             return -1;
 714         }
 715 
 716         rom_addr = SK_rom_addr();          /* Try to find a Boot_ROM */
 717 
 718         /* IF we find a Boot_ROM disable it */
 719 
 720         outb(SK_ROM_RAM_OFF, SK_POS2);     /* Boot_ROM + RAM off */  
 721 
 722         /* We found a Boot_ROM and it's gone. Set RAM address on
 723          * Boot_ROM address. 
 724          */ 
 725 
 726         if (rom_addr) 
 727         {
 728             printk("%s: We found Boot_ROM at %#08x. Now setting RAM on"
 729                    "that address\n", SK_NAME, rom_addr);
 730 
 731             outb(POS_ADDR, SK_POS3);       /* Set RAM on Boot_ROM address */
 732         }
 733         else /* We did not find a Boot_ROM, use predefined SK_ADDR for ram */
 734         {
 735             if (sk_addr_flag)       /* No or Invalid SK_ADDR is defined */ 
 736             {
 737                 printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
 738                        dev->name, SK_ADDR);
 739                 return -1;
 740             }
 741 
 742             rom_addr = SK_ADDR;
 743 
 744             outb(POS_ADDR, SK_POS3);       /* Set RAM address */ 
 745         }
 746         outb(SK_RAM_ON, SK_POS2);          /* enable RAM */
 747     }
 748 
 749 #ifdef SK_DEBUG
 750     SK_print_pos(dev, "POS registers after ROM, RAM config");
 751 #endif
 752 
 753     board = (SK_RAM *) rom_addr; 
 754 
 755     /* Read in station address */
 756     for (i = 0, j = 0; i < ETH_ALEN; i++, j+=2)
 757     {
 758         dev->dev_addr[i] = board->rom[j];          
 759     }
 760 
 761     /* Check for manufacturer code */
 762     if (!(dev->dev_addr[0] == SK_MAC0 &&
 763           dev->dev_addr[1] == SK_MAC1 &&
 764           dev->dev_addr[2] == SK_MAC2) )
 765     {
 766         PRINTK(("## %s: We did not find SK_G16 at RAM location.\n",
 767                 SK_NAME)); 
 768         return ENODEV;                     /* NO SK_G16 found */
 769     }
 770 
 771     printk("%s: %s found at %#3x, HW addr: %#04x:%02x:%02x:%02x:%02x:%02x\n",
 772             dev->name,
 773             "Schneider & Koch Netcard",
 774             (unsigned int) dev->base_addr,
 775             dev->dev_addr[0],
 776             dev->dev_addr[1],
 777             dev->dev_addr[2],
 778             dev->dev_addr[3],
 779             dev->dev_addr[4],
 780             dev->dev_addr[5]);
 781 
 782     /* Grab the I/O Port region */
 783     request_region(ioaddr, ETHERCARD_TOTAL_SIZE,"sk_g16");
 784 
 785     /* Initialize device structure */
 786 
 787     /* Allocate memory for private structure */
 788     p = dev->priv = (void *) kmalloc(sizeof(struct priv), GFP_KERNEL);
 789     if (p == NULL)
 790            return -ENOMEM;
 791     memset((char *) dev->priv, 0, sizeof(struct priv)); /* clear memory */
 792 
 793     /* Assign our Device Driver functions */
 794 
 795     dev->open                   = &SK_open;
 796     dev->stop                   = &SK_close;
 797     dev->hard_start_xmit        = &SK_send_packet;
 798     dev->get_stats              = &SK_get_stats;
 799     dev->set_multicast_list     = &set_multicast_list;
 800 
 801 
 802     /* Set the generic fields of the device structure */
 803 
 804     ether_setup(dev);
 805     
 806     dev->flags &= ~IFF_MULTICAST;
 807 
 808     /* Initialize private structure */
 809 
 810     p->ram = (struct SK_ram *) rom_addr; /* Set dual ported RAM addr */
 811     p->tmdhead = &(p->ram)->tmde[0];     /* Set TMD head */
 812     p->rmdhead = &(p->ram)->rmde[0];     /* Set RMD head */
 813 
 814     /* Initialize buffer pointers */
 815 
 816     for (i = 0; i < TMDNUM; i++)
 817     {
 818         p->tmdbufs[i] = &(p->ram)->tmdbuf[i];
 819     }
 820 
 821     for (i = 0; i < RMDNUM; i++)
 822     {
 823         p->rmdbufs[i] = &(p->ram)->rmdbuf[i]; 
 824     }
 825 
 826 #ifdef SK_DEBUG
 827     SK_print_pos(dev, "End of SK_probe");
 828     SK_print_ram(dev);
 829 #endif 
 830 
 831     return 0;                            /* Initialization done */
 832 
 833 } /* End of SK_probe() */
 834 
 835 
 836 /*- 
 837  * Function       : SK_open
 838  * Author         : Patrick J.D. Weichmann
 839  * Date Created   : 94/05/26
 840  *
 841  * Description    : This function is called sometimes after booting 
 842  *                  when ifconfig program is run.
 843  *
 844  *                  This function requests an IRQ, sets the correct
 845  *                  IRQ in the card. Then calls SK_lance_init() to 
 846  *                  init and start the LANCE chip. Then if everything is 
 847  *                  ok returns with 0 (OK), which means SK_G16 is now
 848  *                  opened and operational.
 849  *
 850  *                  (Called by dev_open() /net/inet/dev.c)
 851  *
 852  * Parameters     : I : struct device *dev - SK_G16 device structure
 853  * Return Value   : 0 - Device opened
 854  * Errors         : -EAGAIN - Open failed
 855  * Globals        : irq2dev_map - which device uses which irq
 856  * Side Effects   : None
 857  * Update History :
 858  *     YY/MM/DD  uid  Description
 859 -*/
 860 
 861 static int SK_open(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
 862 {
 863     int i = 0;
 864     int irqval = 0;
 865     int ioaddr = dev->base_addr;
 866 
 867     int irqtab[] = SK_IRQS; 
 868 
 869     struct priv *p = (struct priv *)dev->priv;
 870 
 871     PRINTK(("## %s: At beginning of SK_open(). CSR0: %#06x\n", 
 872            SK_NAME, SK_read_reg(CSR0)));
 873 
 874     if (dev->irq == 0) /* Autoirq */
 875     {
 876         i = 0;
 877 
 878         /* 
 879          * Check if one IRQ out of SK_IRQS is free and install 
 880          * interrupt handler.
 881          * Most done by request_irq(). 
 882          * irqval: 0       - interrupt handler installed for IRQ irqtab[i]
 883          *         -EBUSY  - interrupt busy 
 884          *         -EINVAL - irq > 15 or handler = NULL
 885          */
 886 
 887         do
 888         {
 889           irqval = request_irq(irqtab[i], &SK_interrupt, 0, "sk_g16");
 890           i++;
 891         } while (irqval && irqtab[i]);
 892 
 893         if (irqval) /* We tried every possible IRQ but no success */
 894         {
 895             printk("%s: unable to get an IRQ\n", dev->name);
 896             return -EAGAIN;
 897         }
 898 
 899         dev->irq = irqtab[--i]; 
 900         
 901         outb(i<<2, SK_POS4);           /* Set Card on probed IRQ */
 902 
 903     }
 904     else if (dev->irq == 2) /* IRQ2 is always IRQ9 */
 905     {
 906         if (request_irq(9, &SK_interrupt, 0, "sk_g16"))
 907         {
 908             printk("%s: unable to get IRQ 9\n", dev->name);
 909             return -EAGAIN;
 910         } 
 911         dev->irq = 9;
 912         
 913         /* 
 914          * Now we set card on IRQ2.
 915          * This can be confusing, but remember that IRQ2 on the network
 916          * card is in reality IRQ9
 917          */
 918         outb(0x08, SK_POS4);           /* set card to IRQ2 */
 919 
 920     }
 921     else  /* Check IRQ as defined in Space.c */
 922     {
 923         int i = 0;
 924 
 925         /* check if IRQ free and valid. Then install Interrupt handler */
 926 
 927         if (request_irq(dev->irq, &SK_interrupt, 0, "sk_g16"))
 928         {
 929             printk("%s: unable to get selected IRQ\n", dev->name);
 930             return -EAGAIN;
 931         }
 932 
 933         switch(dev->irq)
 934         {
 935             case 3: i = 0;
 936                     break;
 937             case 5: i = 1;
 938                     break;
 939             case 2: i = 2;
 940                     break;
 941             case 11:i = 3;
 942                     break;
 943             default: 
 944                 printk("%s: Preselected IRQ %d is invalid for %s boards",
 945                        dev->name,
 946                        dev->irq,
 947                        SK_NAME);
 948                 return -EAGAIN;
 949         }      
 950   
 951         outb(i<<2, SK_POS4);           /* Set IRQ on card */
 952     }
 953 
 954     irq2dev_map[dev->irq] = dev;       /* Set IRQ as used by us */
 955     
 956     printk("%s: Schneider & Koch G16 at %#3x, IRQ %d, shared mem at %#08x\n",
 957             dev->name, (unsigned int)dev->base_addr, 
 958             (int) dev->irq, (unsigned int) p->ram);
 959 
 960     if (!(i = SK_lance_init(dev, 0)))  /* LANCE init OK? */
 961     {
 962 
 963 
 964         dev->tbusy = 0;
 965         dev->interrupt = 0;
 966         dev->start = 1;
 967 
 968 #ifdef SK_DEBUG
 969 
 970         /* 
 971          * This debug block tries to stop LANCE,
 972          * reinit LANCE with transmitter and receiver disabled,
 973          * then stop again and reinit with NORMAL_MODE
 974          */
 975 
 976         printk("## %s: After lance init. CSR0: %#06x\n", 
 977                SK_NAME, SK_read_reg(CSR0));
 978         SK_write_reg(CSR0, CSR0_STOP);
 979         printk("## %s: LANCE stopped. CSR0: %#06x\n", 
 980                SK_NAME, SK_read_reg(CSR0));
 981         SK_lance_init(dev, MODE_DTX | MODE_DRX);
 982         printk("## %s: Reinit with DTX + DRX off. CSR0: %#06x\n", 
 983                SK_NAME, SK_read_reg(CSR0));
 984         SK_write_reg(CSR0, CSR0_STOP);
 985         printk("## %s: LANCE stopped. CSR0: %#06x\n", 
 986                SK_NAME, SK_read_reg(CSR0));
 987         SK_lance_init(dev, MODE_NORMAL);
 988         printk("## %s: LANCE back to normal mode. CSR0: %#06x\n", 
 989                SK_NAME, SK_read_reg(CSR0));
 990         SK_print_pos(dev, "POS regs before returning OK");
 991 
 992 #endif /* SK_DEBUG */
 993        
 994         return 0;              /* SK_open() is successful */
 995     }
 996     else /* LANCE init failed */
 997     {
 998 
 999         PRINTK(("## %s: LANCE init failed: CSR0: %#06x\n", 
1000                SK_NAME, SK_read_reg(CSR0)));
1001 
1002         dev->start = 0;        /* Device not ready */
1003         return -EAGAIN;
1004     }
1005 
1006 } /* End of SK_open() */
1007 
1008 
1009 /*-
1010  * Function       : SK_lance_init
1011  * Author         : Patrick J.D. Weichmann
1012  * Date Created   : 94/05/26
1013  *
1014  * Description    : Reset LANCE chip, fill RMD, TMD structures with
1015  *                  start values and Start LANCE.
1016  *
1017  * Parameters     : I : struct device *dev - SK_G16 device structure
1018  *                  I : int mode - put LANCE into "mode" see data-sheet for
1019  *                                 more info.
1020  * Return Value   : 0  - Init done
1021  * Errors         : -1 - Init failed
1022  * Update History :
1023  *     YY/MM/DD  uid  Description
1024 -*/
1025 
1026 static int SK_lance_init(struct device *dev, unsigned short mode)
     /* [previous][next][first][last][top][bottom][index][help] */
1027 {
1028     int i;
1029     struct priv *p = (struct priv *) dev->priv; 
1030     struct tmd  *tmdp;
1031     struct rmd  *rmdp;
1032 
1033     PRINTK(("## %s: At beginning of LANCE init. CSR0: %#06x\n", 
1034            SK_NAME, SK_read_reg(CSR0)));
1035 
1036     /* Reset LANCE */
1037     SK_reset_board();
1038 
1039     /* Initialize TMD's with start values */
1040     p->tmdnum = 0;                   /* First descriptor for transmitting */ 
1041     p->tmdlast = 0;                  /* First descriptor for reading stats */
1042 
1043     for (i = 0; i < TMDNUM; i++)     /* Init all TMD's */
1044     {
1045         tmdp = p->tmdhead + i; 
1046    
1047         tmdp->u.buffer = (unsigned long) p->tmdbufs[i]; /* assign buffer */
1048         
1049         /* Mark TMD as start and end of packet */
1050         tmdp->u.s.status = TX_STP | TX_ENP;
1051     }
1052 
1053 
1054     /* Initialize RMD's with start values */
1055 
1056     p->rmdnum = 0;                   /* First RMD which will be used */
1057  
1058     for (i = 0; i < RMDNUM; i++)     /* Init all RMD's */
1059     {
1060         rmdp = p->rmdhead + i;
1061 
1062         
1063         rmdp->u.buffer = (unsigned long) p->rmdbufs[i]; /* assign buffer */
1064         
1065         /* 
1066          * LANCE must be owner at beginning so that he can fill in 
1067          * receiving packets, set status and release RMD 
1068          */
1069 
1070         rmdp->u.s.status = RX_OWN;  
1071 
1072         rmdp->blen = -PKT_BUF_SZ;    /* Buffer Size in a two's complement */
1073 
1074         rmdp->mlen = 0;              /* init message length */       
1075         
1076     }
1077 
1078     /* Fill LANCE Initialize Block */
1079 
1080     (p->ram)->ib.mode = mode;        /* Set operation mode */
1081 
1082     for (i = 0; i < ETH_ALEN; i++)   /* Set physical address */
1083     {
1084         (p->ram)->ib.paddr[i] = dev->dev_addr[i]; 
1085     }
1086 
1087     for (i = 0; i < 8; i++)          /* Set multicast, logical address */
1088     {
1089         (p->ram)->ib.laddr[i] = 0;   /* We do not use logical addressing */
1090     } 
1091 
1092     /* Set ring descriptor pointers and set number of descriptors */
1093 
1094     (p->ram)->ib.rdrp = (int)  p->rmdhead | RMDNUMMASK;
1095     (p->ram)->ib.tdrp = (int)  p->tmdhead | TMDNUMMASK;
1096 
1097     /* Prepare LANCE Control and Status Registers */
1098 
1099     cli();
1100 
1101     SK_write_reg(CSR3, CSR3_ACON);   /* Ale Control !!!THIS MUST BE SET!!!! */
1102  
1103     /* 
1104      * LANCE addresses the RAM from 0x0000 to 0x3fbf and has no access to
1105      * PC Memory locations.
1106      *
1107      * In structure SK_ram is defined that the first thing in ram
1108      * is the initialization block. So his address is for LANCE always
1109      * 0x0000
1110      *
1111      * CSR1 contains low order bits 15:0 of initialization block address
1112      * CSR2 is built of: 
1113      *    7:0  High order bits 23:16 of initialization block address
1114      *   15:8  reserved, must be 0
1115      */
1116     
1117     /* Set initialization block address (must be on word boundary) */
1118     SK_write_reg(CSR1, 0);          /* Set low order bits 15:0 */
1119     SK_write_reg(CSR2, 0);          /* Set high order bits 23:16 */ 
1120     
1121 
1122     PRINTK(("## %s: After setting CSR1-3. CSR0: %#06x\n", 
1123            SK_NAME, SK_read_reg(CSR0)));
1124 
1125     /* Initialize LANCE */
1126 
1127     /* 
1128      * INIT = Initialize, when set, causes the LANCE to begin the
1129      * initialization procedure and access the Init Block.
1130      */
1131 
1132     SK_write_reg(CSR0, CSR0_INIT); 
1133 
1134     sti();
1135 
1136     /* Wait until LANCE finished initialization */
1137     
1138     SK_set_RAP(CSR0);              /* Register Address Pointer to CSR0 */
1139 
1140     for (i = 0; (i < 100) && !(SK_rread_reg() & CSR0_IDON); i++) 
1141         ; /* Wait until init done or go ahead if problems (i>=100) */
1142 
1143     if (i >= 100) /* Something is wrong ! */
1144     {
1145         printk("%s: can't init am7990, status: %04x "
1146                "init_block: %#08x\n", 
1147                 dev->name, (int) SK_read_reg(CSR0), 
1148                 (unsigned int) &(p->ram)->ib);
1149 
1150 #ifdef SK_DEBUG
1151         SK_print_pos(dev, "LANCE INIT failed");
1152         SK_print_dev(dev,"Device Structure:");
1153 #endif
1154 
1155         return -1;                 /* LANCE init failed */
1156     }
1157 
1158     PRINTK(("## %s: init done after %d ticks\n", SK_NAME, i));
1159 
1160     /* Clear Initialize done, enable Interrupts, start LANCE */
1161 
1162     SK_write_reg(CSR0, CSR0_IDON | CSR0_INEA | CSR0_STRT);
1163 
1164     PRINTK(("## %s: LANCE started. CSR0: %#06x\n", SK_NAME, 
1165             SK_read_reg(CSR0)));
1166 
1167     return 0;                      /* LANCE is up and running */
1168 
1169 } /* End of SK_lance_init() */
1170 
1171 
1172 
1173 /*-
1174  * Function       : SK_send_packet
1175  * Author         : Patrick J.D. Weichmann
1176  * Date Created   : 94/05/27
1177  *
1178  * Description    : Writes an socket buffer into a transmit descriptor
1179  *                  and starts transmission.
1180  *
1181  * Parameters     : I : struct sk_buff *skb - packet to transfer
1182  *                  I : struct device *dev  - SK_G16 device structure
1183  * Return Value   : 0 - OK
1184  *                  1 - Could not transmit (dev_queue_xmit will queue it)
1185  *                      and try to sent it later
1186  * Globals        : None
1187  * Side Effects   : None
1188  * Update History :
1189  *     YY/MM/DD  uid  Description
1190 -*/
1191 
1192 static int SK_send_packet(struct sk_buff *skb, struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
1193 {
1194     struct priv *p = (struct priv *) dev->priv;
1195     struct tmd *tmdp;
1196 
1197     if (dev->tbusy)
1198     {
1199         /* if Transmitter more than 150ms busy -> time_out */
1200 
1201         int tickssofar = jiffies - dev->trans_start;
1202         if (tickssofar < 15)
1203         {
1204             return 1;                    /* We have to try transmit later */
1205         }
1206 
1207         printk("%s: xmitter timed out, try to restart!\n", dev->name);
1208 
1209         SK_lance_init(dev, MODE_NORMAL); /* Reinit LANCE */
1210 
1211         dev->tbusy = 0;                  /* Clear Transmitter flag */
1212 
1213         dev->trans_start = jiffies;      /* Mark Start of transmission */
1214 
1215     }
1216 
1217     /* 
1218      * If some upper Layer thinks we missed a transmit done interrupt
1219      * we are passed NULL.
1220      * (dev_queue_xmit net/inet/dev.c 
1221      */
1222 
1223     if (skb == NULL)
1224     {
1225         /* 
1226          * Dequeue packets from transmit queue and send them.
1227          */
1228         dev_tint(dev); 
1229                     
1230         return 0;
1231     }
1232     
1233     PRINTK2(("## %s: SK_send_packet() called, CSR0 %#04x.\n", 
1234             SK_NAME, SK_read_reg(CSR0)));
1235 
1236 
1237     /* 
1238      * Block a timer-based transmit from overlapping. 
1239      * This means check if we are already in. 
1240      */
1241 
1242     if (set_bit(0, (void *) &dev->tbusy) != 0) /* dev->tbusy already set ? */ 
1243     {
1244         printk("%s: Transmitter access conflict.\n", dev->name);
1245     }
1246     else
1247     {
1248         /* Evaluate Packet length */
1249         short len = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN; 
1250        
1251         tmdp = p->tmdhead + p->tmdnum; /* Which descriptor for transmitting */
1252 
1253         /* Fill in Transmit Message Descriptor */
1254 
1255         /* Copy data into dual ported ram */
1256 
1257         memcpy((char *) (tmdp->u.buffer & 0x00ffffff), (char *)skb->data,
1258                skb->len);
1259 
1260         tmdp->blen = -len;            /* set length to transmit */
1261 
1262         /* 
1263          * Packet start and end is always set because we use the maximum
1264          * packet length as buffer length.
1265          * Relinquish ownership to LANCE
1266          */
1267 
1268         tmdp->u.s.status = TX_OWN | TX_STP | TX_ENP;
1269         
1270         /* Start Demand Transmission */
1271         SK_write_reg(CSR0, CSR0_TDMD | CSR0_INEA);
1272 
1273         dev->trans_start = jiffies;   /* Mark start of transmission */
1274 
1275         /* Set pointer to next transmit buffer */
1276         p->tmdnum++; 
1277         p->tmdnum &= TMDNUM-1; 
1278 
1279         /* Do we own the next transmit buffer ? */
1280         if (! ((p->tmdhead + p->tmdnum)->u.s.status & TX_OWN) )
1281         {
1282            /* 
1283             * We own next buffer and are ready to transmit, so
1284             * clear busy flag
1285             */
1286            dev->tbusy = 0;
1287         }
1288     }
1289     dev_kfree_skb(skb, FREE_WRITE);
1290     return 0;  
1291 } /* End of SK_send_packet */
1292 
1293 
1294 /*-
1295  * Function       : SK_interrupt
1296  * Author         : Patrick J.D. Weichmann
1297  * Date Created   : 94/05/27
1298  *
1299  * Description    : SK_G16 interrupt handler which checks for LANCE
1300  *                  Errors, handles transmit and receive interrupts
1301  *
1302  * Parameters     : I : int irq, struct pt_regs * regs -
1303  * Return Value   : None
1304  * Errors         : None
1305  * Globals        : None
1306  * Side Effects   : None
1307  * Update History :
1308  *     YY/MM/DD  uid  Description
1309 -*/
1310 
1311 static void SK_interrupt(int irq, struct pt_regs * regs)
     /* [previous][next][first][last][top][bottom][index][help] */
1312 {
1313     int csr0;
1314     struct device *dev = (struct device *) irq2dev_map[irq];
1315     struct priv *p = (struct priv *) dev->priv;
1316 
1317 
1318     PRINTK2(("## %s: SK_interrupt(). status: %#06x\n", 
1319             SK_NAME, SK_read_reg(CSR0)));
1320 
1321     if (dev == NULL)
1322     {
1323         printk("SK_interrupt(): IRQ %d for unknown device.\n", irq);
1324     }
1325     
1326 
1327     if (dev->interrupt)
1328     {
1329         printk("%s: Re-entering the interrupt handler.\n", dev->name);
1330     }
1331 
1332     csr0 = SK_read_reg(CSR0);      /* store register for checking */
1333 
1334     dev->interrupt = 1;            /* We are handling an interrupt */
1335 
1336     /* 
1337      * Acknowledge all of the current interrupt sources, disable      
1338      * Interrupts (INEA = 0) 
1339      */
1340 
1341     SK_write_reg(CSR0, csr0 & CSR0_CLRALL); 
1342 
1343     if (csr0 & CSR0_ERR) /* LANCE Error */
1344     {
1345         printk("%s: error: %04x\n", dev->name, csr0);
1346       
1347         if (csr0 & CSR0_MISS)      /* No place to store packet ? */
1348         { 
1349             p->stats.rx_dropped++;
1350         }
1351     }
1352 
1353     if (csr0 & CSR0_RINT)          /* Receive Interrupt (packet arrived) */ 
1354     {
1355         SK_rxintr(dev); 
1356     }
1357 
1358     if (csr0 & CSR0_TINT)          /* Transmit interrupt (packet sent) */
1359     {
1360         SK_txintr(dev);
1361     }
1362 
1363     SK_write_reg(CSR0, CSR0_INEA); /* Enable Interrupts */
1364 
1365     dev->interrupt = 0;            /* We are out */
1366 } /* End of SK_interrupt() */ 
1367 
1368 
1369 /*-
1370  * Function       : SK_txintr
1371  * Author         : Patrick J.D. Weichmann
1372  * Date Created   : 94/05/27
1373  *
1374  * Description    : After sending a packet we check status, update
1375  *                  statistics and relinquish ownership of transmit 
1376  *                  descriptor ring.
1377  *
1378  * Parameters     : I : struct device *dev - SK_G16 device structure
1379  * Return Value   : None
1380  * Errors         : None
1381  * Globals        : None
1382  * Update History :
1383  *     YY/MM/DD  uid  Description
1384 -*/
1385 
1386 static void SK_txintr(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
1387 {
1388     int tmdstat;
1389     struct tmd *tmdp;
1390     struct priv *p = (struct priv *) dev->priv;
1391 
1392 
1393     PRINTK2(("## %s: SK_txintr() status: %#06x\n", 
1394             SK_NAME, SK_read_reg(CSR0)));
1395 
1396     tmdp = p->tmdhead + p->tmdlast;     /* Which buffer we sent at last ? */
1397 
1398     /* Set next buffer */
1399     p->tmdlast++;
1400     p->tmdlast &= TMDNUM-1;
1401 
1402     tmdstat = tmdp->u.s.status & 0xff00; /* filter out status bits 15:08 */
1403 
1404     /* 
1405      * We check status of transmitted packet.
1406      * see LANCE data-sheet for error explanation
1407      */
1408     if (tmdstat & TX_ERR) /* Error occurred */
1409     {
1410         printk("%s: TX error: %04x %04x\n", dev->name, (int) tmdstat,
1411                 (int) tmdp->status2);
1412 
1413         if (tmdp->status2 & TX_TDR)    /* TDR problems? */
1414         {
1415             printk("%s: tdr-problems \n", dev->name);
1416         }
1417 
1418         if (tmdp->status2 & TX_RTRY)   /* Failed in 16 attempts to transmit ? */
1419             p->stats.tx_aborted_errors++;   
1420         if (tmdp->status2 & TX_LCOL)   /* Late collision ? */
1421             p->stats.tx_window_errors++; 
1422         if (tmdp->status2 & TX_LCAR)   /* Loss of Carrier ? */  
1423             p->stats.tx_carrier_errors++;
1424         if (tmdp->status2 & TX_UFLO)   /* Underflow error ? */
1425         {
1426             p->stats.tx_fifo_errors++;
1427 
1428             /* 
1429              * If UFLO error occurs it will turn transmitter of.
1430              * So we must reinit LANCE
1431              */
1432 
1433             SK_lance_init(dev, MODE_NORMAL);
1434         }
1435         
1436         p->stats.tx_errors++;
1437 
1438         tmdp->status2 = 0;             /* Clear error flags */
1439     }
1440     else if (tmdstat & TX_MORE)        /* Collisions occurred ? */
1441     {
1442         /* 
1443          * Here I have a problem.
1444          * I only know that there must be one or up to 15 collisions.
1445          * Thats why TX_MORE is set, because after 16 attempts TX_RTRY
1446          * will be set which means couldn't send packet aborted transfer.
1447          *
1448          * First I did not have this in but then I thought at minimum
1449          * we see that something was not ok.
1450          * If anyone knows something better than this to handle this
1451          * please report it. (see Email addresses in the README file)
1452          */ 
1453 
1454         p->stats.collisions++; 
1455     }
1456     else   /* Packet sent without any problems */
1457     {
1458         p->stats.tx_packets++; 
1459     }
1460 
1461     /* 
1462      * We mark transmitter not busy anymore, because now we have a free
1463      * transmit descriptor which can be filled by SK_send_packet and
1464      * afterwards sent by the LANCE
1465      */
1466 
1467     dev->tbusy = 0; 
1468 
1469     /* 
1470      * mark_bh(NET_BH);
1471      * This will cause net_bh() to run after this interrupt handler.
1472      *
1473      * The function which do handle slow IRQ parts is do_bottom_half()
1474      * which runs at normal kernel priority, that means all interrupt are
1475      * enabled. (see kernel/irq.c)
1476      *  
1477      * net_bh does something like this:
1478      *  - check if already in net_bh
1479      *  - try to transmit something from the send queue
1480      *  - if something is in the receive queue send it up to higher 
1481      *    levels if it is a known protocol
1482      *  - try to transmit something from the send queue
1483      */
1484 
1485     mark_bh(NET_BH); 
1486 
1487 } /* End of SK_txintr() */
1488 
1489 
1490 /*-
1491  * Function       : SK_rxintr
1492  * Author         : Patrick J.D. Weichmann
1493  * Date Created   : 94/05/27
1494  *
1495  * Description    : Buffer sent, check for errors, relinquish ownership
1496  *                  of the receive message descriptor. 
1497  *
1498  * Parameters     : I : SK_G16 device structure
1499  * Return Value   : None
1500  * Globals        : None
1501  * Update History :
1502  *     YY/MM/DD  uid  Description
1503 -*/
1504 
1505 static void SK_rxintr(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
1506 {
1507 
1508     struct rmd *rmdp;
1509     int rmdstat;
1510     struct priv *p = (struct priv *) dev->priv;
1511 
1512     PRINTK2(("## %s: SK_rxintr(). CSR0: %#06x\n", 
1513             SK_NAME, SK_read_reg(CSR0)));
1514 
1515     rmdp = p->rmdhead + p->rmdnum;
1516 
1517     /* As long as we own the next entry, check status and send
1518      * it up to higher layer 
1519      */
1520 
1521     while (!( (rmdstat = rmdp->u.s.status) & RX_OWN))
1522     {
1523         /* 
1524          * Start and end of packet must be set, because we use 
1525          * the ethernet maximum packet length (1518) as buffer size.
1526          * 
1527          * Because our buffers are at maximum OFLO and BUFF errors are
1528          * not to be concerned (see Data sheet)
1529          */
1530 
1531         if ((rmdstat & (RX_STP | RX_ENP)) != (RX_STP | RX_ENP))
1532         {
1533             /* Start of a frame > 1518 Bytes ? */
1534 
1535             if (rmdstat & RX_STP) 
1536             {
1537                 p->stats.rx_errors++;        /* bad packet received */
1538                 p->stats.rx_length_errors++; /* packet to long */
1539 
1540                 printk("%s: packet too long\n", dev->name);
1541             }
1542             
1543             /* 
1544              * All other packets will be ignored until a new frame with
1545              * start (RX_STP) set follows.
1546              * 
1547              * What we do is just give descriptor free for new incoming
1548              * packets. 
1549              */
1550 
1551             rmdp->u.s.status = RX_OWN;      /* Relinquish ownership to LANCE */ 
1552 
1553         }
1554         else if (rmdstat & RX_ERR)          /* Receive Error ? */
1555         {
1556             printk("%s: RX error: %04x\n", dev->name, (int) rmdstat);
1557             
1558             p->stats.rx_errors++;
1559 
1560             if (rmdstat & RX_FRAM) p->stats.rx_frame_errors++;
1561             if (rmdstat & RX_CRC)  p->stats.rx_crc_errors++;
1562 
1563             rmdp->u.s.status = RX_OWN;      /* Relinquish ownership to LANCE */
1564 
1565         }
1566         else /* We have a packet which can be queued for the upper layers */
1567         {
1568 
1569             int len = (rmdp->mlen & 0x0fff);  /* extract message length from receive buffer */
1570             struct sk_buff *skb;
1571 
1572             skb = dev_alloc_skb(len+2); /* allocate socket buffer */ 
1573 
1574             if (skb == NULL)                /* Could not get mem ? */
1575             {
1576     
1577                 /* 
1578                  * Couldn't allocate sk_buffer so we give descriptor back
1579                  * to Lance, update statistics and go ahead.
1580                  */
1581 
1582                 rmdp->u.s.status = RX_OWN;  /* Relinquish ownership to LANCE */
1583                 printk("%s: Couldn't allocate sk_buff, deferring packet.\n",
1584                        dev->name);
1585                 p->stats.rx_dropped++;
1586 
1587                 break;                      /* Jump out */
1588             }
1589             
1590             /* Prepare sk_buff to queue for upper layers */
1591 
1592             skb->dev = dev;
1593             skb_reserve(skb,2);         /* Align IP header on 16 byte boundary */
1594             
1595             /* 
1596              * Copy data out of our receive descriptor into sk_buff.
1597              *
1598              * (rmdp->u.buffer & 0x00ffffff) -> get address of buffer and 
1599              * ignore status fields) 
1600              */
1601 
1602             memcpy(skb_put(skb,len), (unsigned char *) (rmdp->u.buffer & 0x00ffffff),
1603                    len);
1604 
1605 
1606             /* 
1607              * Notify the upper protocol layers that there is another packet
1608              * to handle
1609              *
1610              * netif_rx() always succeeds. see /net/inet/dev.c for more.
1611              */
1612 
1613             skb->protocol=eth_type_trans(skb,dev);
1614             netif_rx(skb);                 /* queue packet and mark it for processing */
1615            
1616             /* 
1617              * Packet is queued and marked for processing so we
1618              * free our descriptor and update statistics 
1619              */
1620 
1621             rmdp->u.s.status = RX_OWN;
1622             p->stats.rx_packets++;
1623 
1624 
1625             p->rmdnum++;
1626             p->rmdnum %= RMDNUM;
1627 
1628             rmdp = p->rmdhead + p->rmdnum;
1629         }
1630     }
1631 } /* End of SK_rxintr() */
1632 
1633 
1634 /*-
1635  * Function       : SK_close
1636  * Author         : Patrick J.D. Weichmann
1637  * Date Created   : 94/05/26
1638  *
1639  * Description    : close gets called from dev_close() and should
1640  *                  deinstall the card (free_irq, mem etc).
1641  *
1642  * Parameters     : I : struct device *dev - our device structure
1643  * Return Value   : 0 - closed device driver
1644  * Errors         : None
1645  * Globals        : None
1646  * Update History :
1647  *     YY/MM/DD  uid  Description
1648 -*/
1649 
1650 /* I have tried to set BOOT_ROM on and RAM off but then, after a 'ifconfig
1651  * down' the system stops. So I don't shut set card to init state.
1652  */
1653 
1654 static int SK_close(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
1655 {
1656 
1657     PRINTK(("## %s: SK_close(). CSR0: %#06x\n", 
1658            SK_NAME, SK_read_reg(CSR0)));
1659 
1660     dev->tbusy = 1;                /* Transmitter busy */
1661     dev->start = 0;                /* Card down */
1662 
1663     printk("%s: Shutting %s down CSR0 %#06x\n", dev->name, SK_NAME, 
1664            (int) SK_read_reg(CSR0));
1665 
1666     SK_write_reg(CSR0, CSR0_STOP); /* STOP the LANCE */
1667 
1668     free_irq(dev->irq);            /* Free IRQ */
1669     irq2dev_map[dev->irq] = 0;     /* Mark IRQ as unused */
1670 
1671     return 0; /* always succeed */
1672     
1673 } /* End of SK_close() */
1674 
1675 
1676 /*-
1677  * Function       : SK_get_stats
1678  * Author         : Patrick J.D. Weichmann
1679  * Date Created   : 94/05/26
1680  *
1681  * Description    : Return current status structure to upper layers.
1682  *                  It is called by sprintf_stats (dev.c).
1683  *
1684  * Parameters     : I : struct device *dev   - our device structure
1685  * Return Value   : struct enet_statistics * - our current statistics
1686  * Errors         : None
1687  * Side Effects   : None
1688  * Update History :
1689  *     YY/MM/DD  uid  Description
1690 -*/
1691 
1692 static struct enet_statistics *SK_get_stats(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
1693 {
1694 
1695     struct priv *p = (struct priv *) dev->priv;
1696 
1697     PRINTK(("## %s: SK_get_stats(). CSR0: %#06x\n", 
1698            SK_NAME, SK_read_reg(CSR0)));
1699 
1700     return &p->stats;             /* Return Device status */
1701 
1702 } /* End of SK_get_stats() */
1703 
1704 
1705 /*-
1706  * Function       : set_multicast_list
1707  * Author         : Patrick J.D. Weichmann
1708  * Date Created   : 94/05/26
1709  *
1710  * Description    : This function gets called when a program performs
1711  *                  a SIOCSIFFLAGS call. Ifconfig does this if you call
1712  *                  'ifconfig [-]allmulti' which enables or disables the
1713  *                  Promiscuous mode.
1714  *                  Promiscuous mode is when the Network card accepts all
1715  *                  packets, not only the packets which match our MAC 
1716  *                  Address. It is useful for writing a network monitor,
1717  *                  but it is also a security problem. You have to remember
1718  *                  that all information on the net is not encrypted.
1719  *
1720  * Parameters     : I : struct device *dev - SK_G16 device Structure
1721  * Return Value   : None
1722  * Errors         : None
1723  * Globals        : None
1724  * Update History :
1725  *     YY/MM/DD  uid  Description
1726  *     95/10/18  ACox  Noew multicast calling scheme
1727 -*/
1728 
1729 
1730 /* Set or clear the multicast filter for SK_G16.
1731  */
1732 
1733 static void set_multicast_list(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
1734 {
1735 
1736     if (dev->flags&IFF_PROMISC)
1737     {
1738         /* Reinitialize LANCE with MODE_PROM set */
1739         SK_lance_init(dev, MODE_PROM);
1740     }
1741     else if (dev->mc_count==0 && !(dev->flags&IFF_ALLMULTI))
1742     {
1743         /* Reinitialize LANCE without MODE_PROM */
1744         SK_lance_init(dev, MODE_NORMAL);
1745     }
1746     else
1747     {
1748         /* Multicast with logical address filter on */
1749         /* Reinitialize LANCE without MODE_PROM */
1750         SK_lance_init(dev, MODE_NORMAL);
1751         
1752         /* Not implemented yet. */
1753     }
1754 } /* End of set_multicast_list() */
1755 
1756 #endif     
1757 
1758 
1759 
1760 /*-
1761  * Function       : SK_rom_addr
1762  * Author         : Patrick J.D. Weichmann
1763  * Date Created   : 94/06/01
1764  *
1765  * Description    : Try to find a Boot_ROM at all possible locations
1766  *
1767  * Parameters     : None
1768  * Return Value   : Address where Boot_ROM is
1769  * Errors         : 0 - Did not find Boot_ROM
1770  * Globals        : None
1771  * Update History :
1772  *     YY/MM/DD  uid  Description
1773 -*/
1774 
1775 unsigned int SK_rom_addr(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1776 {
1777     int i,j;
1778     int rom_found = 0;
1779     unsigned int rom_location[] = SK_BOOT_ROM_LOCATIONS;
1780     unsigned char rom_id[] = SK_BOOT_ROM_ID;
1781     unsigned char *test_byte;
1782 
1783     /* Autodetect Boot_ROM */
1784     PRINTK(("## %s: Autodetection of Boot_ROM\n", SK_NAME));
1785 
1786     for (i = 0; (rom_location[i] != 0) && (rom_found == 0); i++)
1787     {
1788         
1789         PRINTK(("##   Trying ROM location %#08x", rom_location[i]));
1790         
1791         rom_found = 1; 
1792         for (j = 0; j < 6; j++)
1793         {
1794             test_byte = (unsigned char *) (rom_location[i]+j);
1795             PRINTK((" %02x ", *test_byte));
1796 
1797             if(!(*test_byte == rom_id[j]))
1798             {
1799                 rom_found = 0;
1800             } 
1801         }
1802         PRINTK(("\n"));
1803     }
1804 
1805     if (rom_found == 1)
1806     {
1807         PRINTK(("## %s: Boot_ROM found at %#08x\n", 
1808                SK_NAME, rom_location[(i-1)]));
1809 
1810         return (rom_location[--i]);
1811     }
1812     else
1813     {
1814         PRINTK(("%s: No Boot_ROM found\n", SK_NAME));
1815         return 0;
1816     }
1817 } /* End of SK_rom_addr() */
1818 
1819 
1820 
1821 /* LANCE access functions 
1822  *
1823  * ! CSR1-3 can only be accessed when in CSR0 the STOP bit is set !
1824  */
1825 
1826 
1827 /*-
1828  * Function       : SK_reset_board
1829  *
1830  * Author         : Patrick J.D. Weichmann
1831  *
1832  * Date Created   : 94/05/25
1833  *
1834  * Description    : This function resets SK_G16 and all components, but
1835  *                  POS registers are not changed
1836  *
1837  * Parameters     : None
1838  * Return Value   : None
1839  * Errors         : None
1840  * Globals        : SK_RAM *board - SK_RAM structure pointer
1841  *
1842  * Update History :
1843  *     YY/MM/DD  uid  Description
1844 -*/
1845 
1846 void SK_reset_board(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1847 {
1848     int i;
1849 
1850     SK_PORT = 0x00;           /* Reset active */
1851     for (i = 0; i < 10 ; i++) /* Delay min 5ms */
1852         ;
1853     SK_PORT = SK_RESET;       /* Set back to normal operation */
1854 
1855 } /* End of SK_reset_board() */
1856 
1857 
1858 /*-
1859  * Function       : SK_set_RAP
1860  * Author         : Patrick J.D. Weichmann
1861  * Date Created   : 94/05/25
1862  *
1863  * Description    : Set LANCE Register Address Port to register
1864  *                  for later data transfer.
1865  *
1866  * Parameters     : I : reg_number - which CSR to read/write from/to
1867  * Return Value   : None
1868  * Errors         : None
1869  * Globals        : SK_RAM *board - SK_RAM structure pointer
1870  * Update History :
1871  *     YY/MM/DD  uid  Description
1872 -*/
1873 
1874 void SK_set_RAP(int reg_number)
     /* [previous][next][first][last][top][bottom][index][help] */
1875 {
1876     SK_IOREG = reg_number;
1877     SK_PORT  = SK_RESET | SK_RAP | SK_WREG;
1878     SK_IOCOM = SK_DOIO;
1879 
1880     while (SK_PORT & SK_IORUN) 
1881         ;
1882 } /* End of SK_set_RAP() */
1883 
1884 
1885 /*-
1886  * Function       : SK_read_reg
1887  * Author         : Patrick J.D. Weichmann
1888  * Date Created   : 94/05/25
1889  *
1890  * Description    : Set RAP and read data from a LANCE CSR register
1891  *
1892  * Parameters     : I : reg_number - which CSR to read from
1893  * Return Value   : Register contents
1894  * Errors         : None
1895  * Globals        : SK_RAM *board - SK_RAM structure pointer
1896  * Update History :
1897  *     YY/MM/DD  uid  Description
1898 -*/
1899 
1900 int SK_read_reg(int reg_number)
     /* [previous][next][first][last][top][bottom][index][help] */
1901 {
1902     SK_set_RAP(reg_number);
1903 
1904     SK_PORT  = SK_RESET | SK_RDATA | SK_RREG;
1905     SK_IOCOM = SK_DOIO;
1906 
1907     while (SK_PORT & SK_IORUN)
1908         ;
1909     return (SK_IOREG);
1910 
1911 } /* End of SK_read_reg() */
1912 
1913 
1914 /*-
1915  * Function       : SK_rread_reg
1916  * Author         : Patrick J.D. Weichmann
1917  * Date Created   : 94/05/28
1918  *
1919  * Description    : Read data from preseted register.
1920  *                  This function requires that you know which
1921  *                  Register is actually set. Be aware that CSR1-3
1922  *                  can only be accessed when in CSR0 STOP is set.
1923  *
1924  * Return Value   : Register contents
1925  * Errors         : None
1926  * Globals        : SK_RAM *board - SK_RAM structure pointer
1927  * Update History :
1928  *     YY/MM/DD  uid  Description
1929 -*/
1930 
1931 int SK_rread_reg(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1932 {
1933     SK_PORT  = SK_RESET | SK_RDATA | SK_RREG;
1934 
1935     SK_IOCOM = SK_DOIO;
1936 
1937     while (SK_PORT & SK_IORUN)
1938         ;
1939     return (SK_IOREG);
1940 
1941 } /* End of SK_rread_reg() */
1942 
1943 
1944 /*-
1945  * Function       : SK_write_reg
1946  * Author         : Patrick J.D. Weichmann
1947  * Date Created   : 94/05/25
1948  *
1949  * Description    : This function sets the RAP then fills in the
1950  *                  LANCE I/O Reg and starts Transfer to LANCE.
1951  *                  It waits until transfer has ended which is max. 7 ms
1952  *                  and then it returns.
1953  *
1954  * Parameters     : I : reg_number - which CSR to write to
1955  *                  I : value      - what value to fill into register 
1956  * Return Value   : None
1957  * Errors         : None
1958  * Globals        : SK_RAM *board - SK_RAM structure pointer
1959  * Update History :
1960  *     YY/MM/DD  uid  Description
1961 -*/
1962 
1963 void SK_write_reg(int reg_number, int value)
     /* [previous][next][first][last][top][bottom][index][help] */
1964 {
1965     SK_set_RAP(reg_number);
1966 
1967     SK_IOREG = value;
1968     SK_PORT  = SK_RESET | SK_RDATA | SK_WREG;
1969     SK_IOCOM = SK_DOIO;
1970 
1971     while (SK_PORT & SK_IORUN)
1972         ;
1973 } /* End of SK_write_reg */
1974 
1975 
1976 
1977 /* 
1978  * Debugging functions
1979  * -------------------
1980  */
1981 
1982 /*-
1983  * Function       : SK_print_pos
1984  * Author         : Patrick J.D. Weichmann
1985  * Date Created   : 94/05/25
1986  *
1987  * Description    : This function prints out the 4 POS (Programmable
1988  *                  Option Select) Registers. Used mainly to debug operation.
1989  *
1990  * Parameters     : I : struct device *dev - SK_G16 device structure
1991  *                  I : char * - Text which will be printed as title
1992  * Return Value   : None
1993  * Errors         : None
1994  * Update History :
1995  *     YY/MM/DD  uid  Description
1996 -*/
1997 
1998 void SK_print_pos(struct device *dev, char *text)
     /* [previous][next][first][last][top][bottom][index][help] */
1999 {
2000     int ioaddr = dev->base_addr;
2001 
2002     unsigned char pos0 = inb(SK_POS0),
2003                   pos1 = inb(SK_POS1),
2004                   pos2 = inb(SK_POS2),
2005                   pos3 = inb(SK_POS3),
2006                   pos4 = inb(SK_POS4);
2007 
2008 
2009     printk("## %s: %s.\n"
2010            "##   pos0=%#4x pos1=%#4x pos2=%#04x pos3=%#08x pos4=%#04x\n",
2011            SK_NAME, text, pos0, pos1, pos2, (pos3<<14), pos4);
2012 
2013 } /* End of SK_print_pos() */
2014 
2015 
2016 
2017 /*-
2018  * Function       : SK_print_dev
2019  * Author         : Patrick J.D. Weichmann
2020  * Date Created   : 94/05/25
2021  *
2022  * Description    : This function simply prints out the important fields
2023  *                  of the device structure.
2024  *
2025  * Parameters     : I : struct device *dev  - SK_G16 device structure
2026  *                  I : char *text - Title for printing
2027  * Return Value   : None
2028  * Errors         : None
2029  * Update History :
2030  *     YY/MM/DD  uid  Description
2031 -*/
2032 
2033 void SK_print_dev(struct device *dev, char *text)
     /* [previous][next][first][last][top][bottom][index][help] */
2034 {
2035     if (dev == NULL)
2036     {
2037         printk("## %s: Device Structure. %s\n", SK_NAME, text);
2038         printk("## DEVICE == NULL\n");
2039     }
2040     else
2041     {
2042         printk("## %s: Device Structure. %s\n", SK_NAME, text);
2043         printk("## Device Name: %s Base Address: %#06lx IRQ: %d\n", 
2044                dev->name, dev->base_addr, dev->irq);
2045                
2046         printk("##   FLAGS: start: %d tbusy: %ld int: %d\n", 
2047                dev->start, dev->tbusy, dev->interrupt);
2048 
2049         printk("## next device: %#08x init function: %#08x\n", 
2050               (int) dev->next, (int) dev->init);
2051     }
2052 
2053 } /* End of SK_print_dev() */
2054 
2055 
2056 
2057 /*-
2058  * Function       : SK_print_ram
2059  * Author         : Patrick J.D. Weichmann
2060  * Date Created   : 94/06/02
2061  *
2062  * Description    : This function is used to check how are things set up
2063  *                  in the 16KB RAM. Also the pointers to the receive and 
2064  *                  transmit descriptor rings and rx and tx buffers locations.
2065  *                  It contains a minor bug in printing, but has no effect to the values
2066  *                  only newlines are not correct.
2067  *
2068  * Parameters     : I : struct device *dev - SK_G16 device structure
2069  * Return Value   : None
2070  * Errors         : None
2071  * Globals        : None
2072  * Update History :
2073  *     YY/MM/DD  uid  Description
2074 -*/
2075 
2076 void SK_print_ram(struct device *dev)
     /* [previous][next][first][last][top][bottom][index][help] */
2077 {
2078 
2079     int i;    
2080     struct priv *p = (struct priv *) dev->priv;
2081 
2082     printk("## %s: RAM Details.\n"
2083            "##   RAM at %#08x tmdhead: %#08x rmdhead: %#08x initblock: %#08x\n",
2084            SK_NAME, 
2085            (unsigned int) p->ram,
2086            (unsigned int) p->tmdhead, 
2087            (unsigned int) p->rmdhead, 
2088            (unsigned int) &(p->ram)->ib);
2089            
2090     printk("##   ");
2091 
2092     for(i = 0; i < TMDNUM; i++)
2093     {
2094            if (!(i % 3)) /* Every third line do a newline */
2095            {
2096                printk("\n##   ");
2097            }
2098         printk("tmdbufs%d: %#08x ", (i+1), (int) p->tmdbufs[i]);
2099     }
2100     printk("##   ");
2101 
2102     for(i = 0; i < RMDNUM; i++)
2103     {
2104          if (!(i % 3)) /* Every third line do a newline */
2105            {
2106                printk("\n##   ");
2107            }
2108         printk("rmdbufs%d: %#08x ", (i+1), (int) p->rmdbufs[i]);
2109     } 
2110     printk("\n");
2111 
2112 } /* End of SK_print_ram() */
2113 

/* [previous][next][first][last][top][bottom][index][help] */