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

   1 /*
   2     DAVICOM DM9009/DM9102/DM9102A Etherboot Driver      V1.00
   3
   4     This driver was ported from Marty Conner's Tulip Etherboot driver.
   5     Thanks Marty Connor (mdc@thinguin.org)
   6     You can get Tulip driver source file from this URL:
   7
   8     "http://etherboot.sourceforge..net/#Distribution"
   9
  10     This davicom etherboot driver supports DM9009/DM9102/DM9102A/
  11     DM9102A+DM9801/DM9102A+DM9802 NICs.
  12
  13     This software may be used and distributed according to the terms
  14     of the GNU Public License, incorporated herein by reference.
  15
  16 */
  17
  18 /*********************************************************************/
  19 /* Revision History                                                  */
  20 /*********************************************************************/
  21
  22 /*
  23   19 OCT 2000  Sten     1.00
  24                         Different half and full duplex mode
  25                         Do the different programming for DM9801/DM9802
  26
  27   12 OCT 2000  Sten     0.90
  28                         This driver was ported from tulip driver and it
  29                         has the following difference.
  30                         Changed symbol tulip/TULIP to davicom/DAVICOM
  31                         Deleted some code that did not use in this driver.
  32                         Used chain-strcture to replace ring structure
  33                         for both TX/RX descriptor.
  34                         Allocated two tx descriptor.
  35                         According current media mode to set operating
  36                         register(CR6)
  37 */
  38
  39 \f
  40 /*********************************************************************/
  41 /* Declarations                                                      */
  42 /*********************************************************************/
  43
  44 #include "etherboot.h"
  45 #include "nic.h"
  46 #include "pci.h"
  47 #include "cards.h"
  48
  49 #undef DAVICOM_DEBUG
  50 #undef DAVICOM_DEBUG_WHERE
  51
  52 #define TX_TIME_OUT       2*TICKS_PER_SEC
  53
  54 typedef unsigned char  u8;
  55 typedef   signed char  s8;
  56 typedef unsigned short u16;
  57 typedef   signed short s16;
  58 typedef unsigned int   u32;
  59 typedef   signed int   s32;
  60
  61 /* Register offsets for davicom device */
  62 enum davicom_offsets {
  63    CSR0=0,     CSR1=0x08,  CSR2=0x10,  CSR3=0x18,  CSR4=0x20,  CSR5=0x28,
  64    CSR6=0x30,  CSR7=0x38,  CSR8=0x40,  CSR9=0x48, CSR10=0x50, CSR11=0x58,
  65   CSR12=0x60, CSR13=0x68, CSR14=0x70, CSR15=0x78, CSR16=0x80, CSR20=0xA0
  66 };
  67
  68 /* EEPROM Address width definitions */
  69 #define EEPROM_ADDRLEN 6
  70 #define EEPROM_SIZE    32              /* 1 << EEPROM_ADDRLEN */
  71 /* Used to be 128, but we only need to read enough to get the MAC
  72    address at bytes 20..25 */
  73
  74 /* Data Read from the EEPROM */
  75 static unsigned char ee_data[EEPROM_SIZE];
  76
  77 /* The EEPROM commands include the alway-set leading bit. */
  78 #define EE_WRITE_CMD    (5 << addr_len)
  79 #define EE_READ_CMD     (6 << addr_len)
  80 #define EE_ERASE_CMD    (7 << addr_len)
  81
  82 /* EEPROM_Ctrl bits. */
  83 #define EE_SHIFT_CLK    0x02    /* EEPROM shift clock. */
  84 #define EE_CS           0x01    /* EEPROM chip select. */
  85 #define EE_DATA_WRITE   0x04    /* EEPROM chip data in. */
  86 #define EE_WRITE_0      0x01
  87 #define EE_WRITE_1      0x05
  88 #define EE_DATA_READ    0x08    /* EEPROM chip data out. */
  89 #define EE_ENB          (0x4800 | EE_CS)
  90
  91 /* Sten 10/11 for phyxcer */
  92 #define PHY_DATA_0      0x0
  93 #define PHY_DATA_1      0x20000
  94 #define MDCLKH          0x10000
  95
  96 /* Delay between EEPROM clock transitions.  Even at 33Mhz current PCI
  97    implementations don't overrun the EEPROM clock.  We add a bus
  98    turn-around to insure that this remains true.  */
  99 #define eeprom_delay()  inl(ee_addr)
 100
 101 /* helpful macro if on a big_endian machine for changing byte order.
 102    not strictly needed on Intel */
 103 #define le16_to_cpu(val) (val)
 104
 105 /* transmit and receive descriptor format */
 106 struct txdesc {
 107   volatile unsigned long   status;         /* owner, status */
 108   unsigned long   buf1sz:11,      /* size of buffer 1 */
 109     buf2sz:11,                    /* size of buffer 2 */
 110     control:10;                   /* control bits */
 111   const unsigned char *buf1addr;  /* buffer 1 address */
 112   const unsigned char *buf2addr;  /* buffer 2 address */
 113 };
 114
 115 struct rxdesc {
 116   volatile unsigned long   status;         /* owner, status */
 117   unsigned long   buf1sz:11,      /* size of buffer 1 */
 118     buf2sz:11,                    /* size of buffer 2 */
 119     control:10;                   /* control bits */
 120   unsigned char   *buf1addr;      /* buffer 1 address */
 121   unsigned char   *buf2addr;      /* buffer 2 address */
 122 };
 123
 124 /* Size of transmit and receive buffers */
 125 #define BUFLEN 1536
 126
 127 /*********************************************************************/
 128 /* Global Storage                                                    */
 129 /*********************************************************************/
 130
 131 /* PCI Bus parameters */
 132 static unsigned short vendor, dev_id;
 133 static unsigned long ioaddr;
 134
 135 /* Note: transmit and receive buffers must be longword aligned and
 136    longword divisable */
 137
 138 /* transmit descriptor and buffer */
 139 #define NTXD 2
 140 static struct txdesc txd[NTXD] __attribute__ ((aligned(4)));
 141 #ifdef  USE_LOWMEM_BUFFER
 142 #define txb ((char *)0x10000 - BUFLEN)
 143 #else
 144 static unsigned char txb[BUFLEN] __attribute__ ((aligned(4)));
 145 #endif
 146
 147 /* receive descriptor(s) and buffer(s) */
 148 #define NRXD 4
 149 static struct rxdesc rxd[NRXD] __attribute__ ((aligned(4)));
 150 #ifdef  USE_LOWMEM_BUFFER
 151 #define rxb ((char *)0x10000 - NRXD * BUFLEN - BUFLEN)
 152 #else
 153 static unsigned char rxb[NRXD * BUFLEN] __attribute__ ((aligned(4)));
 154 #endif
 155 static int rxd_tail;
 156 static int TxPtr;
 157
 158 \f
 159 /*********************************************************************/
 160 /* Function Prototypes                                               */
 161 /*********************************************************************/
 162 static void whereami(const char *str);
 163 static int read_eeprom(unsigned long ioaddr, int location, int addr_len);
 164 struct nic *davicom_probe(struct nic *nic, unsigned short *io_addrs,
 165                         struct pci_device *pci);
 166 static void davicom_init_chain(struct nic *nic);        /* Sten 10/9 */
 167 static void davicom_reset(struct nic *nic);
 168 static void davicom_transmit(struct nic *nic, const char *d, unsigned int t,
 169                            unsigned int s, const char *p);
 170 static int davicom_poll(struct nic *nic);
 171 static void davicom_disable(struct nic *nic);
 172 static void whereami (const char *str);
 173 #ifdef  DAVICOM_DEBUG
 174 static void davicom_more(void);
 175 #endif /* DAVICOM_DEBUG */
 176 static void davicom_wait(unsigned int nticks);
 177 static int phy_read(int);
 178 static void phy_write(int, u16);
 179 static void phy_write_1bit(u32, u32);
 180 static int phy_read_1bit(u32);
 181 static void davicom_media_chk(struct nic *);
 182
 183 \f
 184 /*********************************************************************/
 185 /* Utility Routines                                                  */
 186 /*********************************************************************/
 187
 188 static inline void whereami (const char *str)
 189 {
 190 #ifdef  DAVICOM_DEBUG_WHERE
 191   printf("%s\n", str);
 192   /* sleep(2); */
 193 #endif
 194 }
 195
 196 #ifdef  DAVICOM_DEBUG
 197 static void davicom_more()
 198 {
 199   printf("\n\n-- more --");
 200   while (!iskey())
 201     /* wait */;
 202   getchar();
 203   printf("\n\n");
 204 }
 205 #endif /* DAVICOM_DEBUG */
 206
 207 static void davicom_wait(unsigned int nticks)
 208 {
 209   unsigned int to = currticks() + nticks;
 210   while (currticks() < to)
 211     /* wait */ ;
 212 }
 213
 214 \f
 215 /*********************************************************************/
 216 /* For DAVICOM phyxcer register by MII interface                     */
 217 /*********************************************************************/
 218 /*
 219   Read a word data from phy register
 220 */
 221 static int phy_read(int location)
 222 {
 223  int i, phy_addr=1;
 224  u16 phy_data;
 225  u32 io_dcr9;
 226
 227  whereami("phy_read\n");
 228
 229  io_dcr9 = ioaddr + CSR9;
 230
 231  /* Send 33 synchronization clock to Phy controller */
 232  for (i=0; i<34; i++)
 233      phy_write_1bit(io_dcr9, PHY_DATA_1);
 234
 235  /* Send start command(01) to Phy */
 236  phy_write_1bit(io_dcr9, PHY_DATA_0);
 237  phy_write_1bit(io_dcr9, PHY_DATA_1);
 238
 239  /* Send read command(10) to Phy */
 240  phy_write_1bit(io_dcr9, PHY_DATA_1);
 241  phy_write_1bit(io_dcr9, PHY_DATA_0);
 242
 243  /* Send Phy addres */
 244  for (i=0x10; i>0; i=i>>1)
 245      phy_write_1bit(io_dcr9, phy_addr&i ? PHY_DATA_1: PHY_DATA_0);
 246
 247  /* Send register addres */
 248  for (i=0x10; i>0; i=i>>1)
 249      phy_write_1bit(io_dcr9, location&i ? PHY_DATA_1: PHY_DATA_0);
 250
 251  /* Skip transition state */
 252  phy_read_1bit(io_dcr9);
 253
 254  /* read 16bit data */
 255  for (phy_data=0, i=0; i<16; i++) {
 256    phy_data<<=1;
 257    phy_data|=phy_read_1bit(io_dcr9);
 258  }
 259
 260  return phy_data;
 261 }
 262
 263 /*
 264   Write a word to Phy register
 265 */
 266 static void phy_write(int location, u16 phy_data)
 267 {
 268  u16 i, phy_addr=1;
 269  u32 io_dcr9;
 270
 271  whereami("phy_write\n");
 272
 273  io_dcr9 = ioaddr + CSR9;
 274
 275  /* Send 33 synchronization clock to Phy controller */
 276  for (i=0; i<34; i++)
 277    phy_write_1bit(io_dcr9, PHY_DATA_1);
 278
 279  /* Send start command(01) to Phy */
 280  phy_write_1bit(io_dcr9, PHY_DATA_0);
 281  phy_write_1bit(io_dcr9, PHY_DATA_1);
 282
 283  /* Send write command(01) to Phy */
 284  phy_write_1bit(io_dcr9, PHY_DATA_0);
 285  phy_write_1bit(io_dcr9, PHY_DATA_1);
 286
 287  /* Send Phy addres */
 288  for (i=0x10; i>0; i=i>>1)
 289    phy_write_1bit(io_dcr9, phy_addr&i ? PHY_DATA_1: PHY_DATA_0);
 290
 291  /* Send register addres */
 292  for (i=0x10; i>0; i=i>>1)
 293    phy_write_1bit(io_dcr9, location&i ? PHY_DATA_1: PHY_DATA_0);
 294
 295  /* written trasnition */
 296  phy_write_1bit(io_dcr9, PHY_DATA_1);
 297  phy_write_1bit(io_dcr9, PHY_DATA_0);
 298
 299  /* Write a word data to PHY controller */
 300  for (i=0x8000; i>0; i>>=1)
 301    phy_write_1bit(io_dcr9, phy_data&i ? PHY_DATA_1: PHY_DATA_0);
 302 }
 303
 304 /*
 305   Write one bit data to Phy Controller
 306 */
 307 static void phy_write_1bit(u32 ee_addr, u32 phy_data)
 308 {
 309  whereami("phy_write_1bit\n");
 310  outl(phy_data, ee_addr);                        /* MII Clock Low */
 311  eeprom_delay();
 312  outl(phy_data|MDCLKH, ee_addr);                 /* MII Clock High */
 313  eeprom_delay();
 314  outl(phy_data, ee_addr);                        /* MII Clock Low */
 315  eeprom_delay();
 316 }
 317
 318 /*
 319   Read one bit phy data from PHY controller
 320 */
 321 static int phy_read_1bit(u32 ee_addr)
 322 {
 323  int phy_data;
 324
 325  whereami("phy_read_1bit\n");
 326
 327  outl(0x50000, ee_addr);
 328  eeprom_delay();
 329
 330  phy_data=(inl(ee_addr)>>19) & 0x1;
 331
 332  outl(0x40000, ee_addr);
 333  eeprom_delay();
 334
 335  return phy_data;
 336 }
 337
 338 /*
 339   DM9801/DM9802 present check and program
 340 */
 341 static void HPNA_process(void)
 342 {
 343
 344  if ( (phy_read(3) & 0xfff0) == 0xb900 ) {
 345    if ( phy_read(31) == 0x4404 ) {
 346      /* DM9801 present */
 347      if (phy_read(3) == 0xb901)
 348        phy_write(16, 0x5);      /* DM9801 E4 */
 349      else
 350        phy_write(16, 0x1005); /* DM9801 E3 and others */
 351      phy_write(25, ((phy_read(24) + 3) & 0xff) | 0xf000);
 352    } else {
 353      /* DM9802 present */
 354      phy_write(16, 0x5);
 355      phy_write(25, (phy_read(25) & 0xff00) + 2);
 356    }
 357  }
 358 }
 359
 360 /*
 361   Sense media mode and set CR6
 362 */
 363 static void davicom_media_chk(struct nic * nic)
 364 {
 365   unsigned long to, csr6;
 366
 367   csr6 = 0x00200000;    /* SF */
 368   outl(csr6, ioaddr + CSR6);
 369
 370   if (vendor == PCI_VENDOR_ID_DAVICOM && dev_id == PCI_DEVICE_ID_DM9009) {
 371     /* Set to 10BaseT mode for DM9009 */
 372     phy_write(0, 0);
 373   } else {
 374     /* For DM9102/DM9102A */
 375     to = currticks() + 2 * TICKS_PER_SEC;
 376     while ( ((phy_read(1) & 0x24)!=0x24) && (currticks() < to))
 377       /* wait */ ;
 378
 379     if ( (phy_read(1) & 0x24) == 0x24 ) {
 380       if (phy_read(17) & 0xa000)
 381         csr6 |= 0x00000200;     /* Full Duplex mode */
 382     } else
 383       csr6 |= 0x00040000; /* Select DM9801/DM9802 when Ethernet link failed */
 384   }
 385
 386   /* set the chip's operating mode */
 387   outl(csr6, ioaddr + CSR6);
 388
 389   /* DM9801/DM9802 present check & program */
 390   if (csr6 & 0x40000)
 391     HPNA_process();
 392 }
 393
 394 \f
 395 /*********************************************************************/
 396 /* EEPROM Reading Code                                               */
 397 /*********************************************************************/
 398 /* EEPROM routines adapted from the Linux Tulip Code */
 399 /* Reading a serial EEPROM is a "bit" grungy, but we work our way
 400    through:->.
 401 */
 402 static int read_eeprom(unsigned long ioaddr, int location, int addr_len)
 403 {
 404   int i;
 405   unsigned short retval = 0;
 406   long ee_addr = ioaddr + CSR9;
 407   int read_cmd = location | EE_READ_CMD;
 408
 409   whereami("read_eeprom\n");
 410
 411   outl(EE_ENB & ~EE_CS, ee_addr);
 412   outl(EE_ENB, ee_addr);
 413
 414   /* Shift the read command bits out. */
 415   for (i = 4 + addr_len; i >= 0; i--) {
 416     short dataval = (read_cmd & (1 << i)) ? EE_DATA_WRITE : 0;
 417     outl(EE_ENB | dataval, ee_addr);
 418     eeprom_delay();
 419     outl(EE_ENB | dataval | EE_SHIFT_CLK, ee_addr);
 420     eeprom_delay();
 421   }
 422   outl(EE_ENB, ee_addr);
 423
 424   for (i = 16; i > 0; i--) {
 425     outl(EE_ENB | EE_SHIFT_CLK, ee_addr);
 426     eeprom_delay();
 427     retval = (retval << 1) | ((inl(ee_addr) & EE_DATA_READ) ? 1 : 0);
 428     outl(EE_ENB, ee_addr);
 429     eeprom_delay();
 430   }
 431
 432   /* Terminate the EEPROM access. */
 433   outl(EE_ENB & ~EE_CS, ee_addr);
 434   return retval;
 435 }
 436 \f
 437 /*********************************************************************/
 438 /* davicom_init_chain - setup the tx and rx descriptors                */
 439 /* Sten 10/9                                                         */
 440 /*********************************************************************/
 441 static void davicom_init_chain(struct nic *nic)
 442 {
 443   int i;
 444
 445   /* setup the transmit descriptor */
 446   /* Sten: Set 2 TX descriptor but use one TX buffer because
 447            it transmit a packet and wait complete every time. */
 448   for (i=0; i<NTXD; i++) {
 449     txd[i].buf1addr = &txb[0];          /* Used same TX buffer */
 450     txd[i].buf2addr = (unsigned char *)&txd[i+1]; /*  Point to Next TX desc */
 451     txd[i].buf1sz   = 0;
 452     txd[i].buf2sz   = 0;
 453     txd[i].control  = 0x184;           /* Begin/End/Chain */
 454     txd[i].status   = 0x00000000;      /* give ownership to Host */
 455   }
 456
 457   /* construct perfect filter frame with mac address as first match
 458      and broadcast address for all others */
 459   for (i=0; i<192; i++) txb[i] = 0xFF;
 460   txb[0] = nic->node_addr[0];
 461   txb[1] = nic->node_addr[1];
 462   txb[4] = nic->node_addr[2];
 463   txb[5] = nic->node_addr[3];
 464   txb[8] = nic->node_addr[4];
 465   txb[9] = nic->node_addr[5];
 466
 467   /* setup receive descriptor */
 468   for (i=0; i<NRXD; i++) {
 469     rxd[i].buf1addr = &rxb[i * BUFLEN];
 470     rxd[i].buf2addr = (unsigned char *)&rxd[i+1]; /* Point to Next RX desc */
 471     rxd[i].buf1sz   = BUFLEN;
 472     rxd[i].buf2sz   = 0;        /* not used */
 473     rxd[i].control  = 0x4;              /* Chain Structure */
 474     rxd[i].status   = 0x80000000;   /* give ownership to device */
 475   }
 476
 477   /* Chain the last descriptor to first */
 478   txd[NTXD - 1].buf2addr = (unsigned char *)&txd[0];
 479   rxd[NRXD - 1].buf2addr = (unsigned char *)&rxd[0];
 480   TxPtr = 0;
 481   rxd_tail = 0;
 482 }
 483
 484 \f
 485 /*********************************************************************/
 486 /* davicom_reset - Reset adapter                                         */
 487 /*********************************************************************/
 488 static void davicom_reset(struct nic *nic)
 489 {
 490   unsigned long to;
 491   u32 addr_low, addr_high;
 492
 493   whereami("davicom_reset\n");
 494
 495   /* Stop Tx and RX */
 496   outl(inl(ioaddr + CSR6) & ~0x00002002, ioaddr + CSR6);
 497
 498   /* Reset the chip, holding bit 0 set at least 50 PCI cycles. */
 499   outl(0x00000001, ioaddr + CSR0);
 500
 501   davicom_wait(TICKS_PER_SEC);
 502
 503   /* TX/RX descriptor burst */
 504   outl(0x0C00000, ioaddr + CSR0);       /* Sten 10/9 */
 505
 506   /* set up transmit and receive descriptors */
 507   davicom_init_chain(nic);      /* Sten 10/9 */
 508
 509   /* Point to receive descriptor */
 510   outl((unsigned long)&rxd[0], ioaddr + CSR3);
 511   outl((unsigned long)&txd[0], ioaddr + CSR4);  /* Sten 10/9 */
 512
 513   /* According phyxcer media mode to set CR6,
 514      DM9102/A phyxcer can auto-detect media mode */
 515   davicom_media_chk(nic);
 516
 517   /* Prepare Setup Frame Sten 10/9 */
 518   txd[TxPtr].buf1sz = 192;
 519   txd[TxPtr].control = 0x024;           /* SF/CE */
 520   txd[TxPtr].status = 0x80000000;       /* Give ownership to device */
 521
 522   /* Start Tx */
 523   outl(inl(ioaddr + CSR6) | 0x00002000, ioaddr + CSR6);
 524   /* immediate transmit demand */
 525   outl(0, ioaddr + CSR1);
 526
 527   to = currticks() + TX_TIME_OUT;
 528   while ((txd[TxPtr].status & 0x80000000) && (currticks() < to)) /* Sten 10/9 */
 529     /* wait */ ;
 530
 531   if (currticks() >= to) {
 532     printf ("TX Setup Timeout!\n");
 533   }
 534   /* Point to next TX descriptor */
 535  TxPtr = (++TxPtr >= NTXD) ? 0:TxPtr;   /* Sten 10/9 */
 536
 537 #ifdef DAVICOM_DEBUG
 538   printf("txd.status = %X\n", txd.status);
 539   printf("ticks = %d\n", currticks() - (to - TX_TIME_OUT));
 540   davicom_more();
 541 #endif
 542
 543   /* enable RX */
 544   outl(inl(ioaddr + CSR6) | 0x00000002, ioaddr + CSR6);
 545   /* immediate poll demand */
 546   outl(0, ioaddr + CSR2);
 547 }
 548
 549 \f
 550 /*********************************************************************/
 551 /* eth_transmit - Transmit a frame                                   */
 552 /*********************************************************************/
 553 static void davicom_transmit(struct nic *nic, const char *d, unsigned int t,
 554                            unsigned int s, const char *p)
 555 {
 556   unsigned long to;
 557
 558   whereami("davicom_transmit\n");
 559
 560   /* Stop Tx */
 561   /* outl(inl(ioaddr + CSR6) & ~0x00002000, ioaddr + CSR6); */
 562
 563   /* setup ethernet header */
 564   memcpy(&txb[0], d, ETH_ALEN); /* DA 6byte */
 565   memcpy(&txb[ETH_ALEN], nic->node_addr, ETH_ALEN); /* SA 6byte*/
 566   txb[ETH_ALEN*2] = (t >> 8) & 0xFF; /* Frame type: 2byte */
 567   txb[ETH_ALEN*2+1] = t & 0xFF;
 568   memcpy(&txb[ETH_HLEN], p, s); /* Frame data */
 569
 570   /* setup the transmit descriptor */
 571   txd[TxPtr].buf1sz   = ETH_HLEN+s;
 572   txd[TxPtr].control  = 0x00000184;      /* LS+FS+CE */
 573   txd[TxPtr].status   = 0x80000000;      /* give ownership to device */
 574
 575   /* immediate transmit demand */
 576   outl(0, ioaddr + CSR1);
 577
 578   to = currticks() + TX_TIME_OUT;
 579   while ((txd[TxPtr].status & 0x80000000) && (currticks() < to))
 580     /* wait */ ;
 581
 582   if (currticks() >= to) {
 583     printf ("TX Timeout!\n");
 584   }
 585
 586   /* Point to next TX descriptor */
 587   TxPtr = (++TxPtr >= NTXD) ? 0:TxPtr;  /* Sten 10/9 */
 588
 589 }
 590 \f
 591 /*********************************************************************/
 592 /* eth_poll - Wait for a frame                                       */
 593 /*********************************************************************/
 594 static int davicom_poll(struct nic *nic)
 595 {
 596   whereami("davicom_poll\n");
 597
 598   if (rxd[rxd_tail].status & 0x80000000)
 599     return 0;
 600
 601   whereami("davicom_poll got one\n");
 602
 603   nic->packetlen = (rxd[rxd_tail].status & 0x3FFF0000) >> 16;
 604
 605   if( rxd[rxd_tail].status & 0x00008000){
 606       rxd[rxd_tail].status = 0x80000000;
 607       rxd_tail++;
 608       if (rxd_tail == NRXD) rxd_tail = 0;
 609       return 0;
 610   }
 611
 612   /* copy packet to working buffer */
 613   /* XXX - this copy could be avoided with a little more work
 614      but for now we are content with it because the optimised
 615      memcpy is quite fast */
 616
 617   memcpy(nic->packet, rxb + rxd_tail * BUFLEN, nic->packetlen);
 618
 619   /* return the descriptor and buffer to receive ring */
 620   rxd[rxd_tail].status = 0x80000000;
 621   rxd_tail++;
 622   if (rxd_tail == NRXD) rxd_tail = 0;
 623
 624   return 1;
 625 }
 626 \f
 627 /*********************************************************************/
 628 /* eth_disable - Disable the interface                               */
 629 /*********************************************************************/
 630 static void davicom_disable(struct nic *nic)
 631 {
 632   whereami("davicom_disable\n");
 633
 634   /* disable interrupts */
 635   outl(0x00000000, ioaddr + CSR7);
 636
 637   /* Stop the chip's Tx and Rx processes. */
 638   outl(inl(ioaddr + CSR6) & ~0x00002002, ioaddr + CSR6);
 639
 640   /* Clear the missed-packet counter. */
 641   (volatile unsigned long)inl(ioaddr + CSR8);
 642 }
 643 \f
 644 /*********************************************************************/
 645 /* eth_probe - Look for an adapter                                   */
 646 /*********************************************************************/
 647 struct nic *davicom_probe(struct nic *nic, unsigned short *io_addrs,
 648                           struct pci_device *pci)
 649 {
 650   unsigned int i;
 651   u32 l1, l2;
 652
 653   whereami("davicom_probe\n");
 654
 655   if (io_addrs == 0 || *io_addrs == 0)
 656     return 0;
 657
 658   vendor  = pci->vendor;
 659   dev_id  = pci->dev_id;
 660   ioaddr  = *io_addrs;
 661
 662   /* wakeup chip */
 663   pcibios_write_config_dword(pci->bus, pci->devfn, 0x40, 0x00000000);
 664
 665   /* Stop the chip's Tx and Rx processes. */
 666   outl(inl(ioaddr + CSR6) & ~0x00002002, ioaddr + CSR6);
 667
 668   /* Clear the missed-packet counter. */
 669   (volatile unsigned long)inl(ioaddr + CSR8);
 670
 671   /* Get MAC Address */
 672   /* read EEPROM data */
 673   for (i = 0; i < sizeof(ee_data)/2; i++)
 674     ((unsigned short *)ee_data)[i] =
 675         le16_to_cpu(read_eeprom(ioaddr, i, EEPROM_ADDRLEN));
 676
 677   /* extract MAC address from EEPROM buffer */
 678   for (i=0; i<ETH_ALEN; i++)
 679     nic->node_addr[i] = ee_data[20+i];
 680
 681   printf("Davicom %! at ioaddr %#hX\n", nic->node_addr, ioaddr);
 682
 683   /* initialize device */
 684   davicom_reset(nic);
 685
 686   nic->reset    = davicom_reset;
 687   nic->poll     = davicom_poll;
 688   nic->transmit = davicom_transmit;
 689   nic->disable  = davicom_disable;
 690
 691   return nic;
 692 }