drivers/net/lan91c96.c

   1 /*------------------------------------------------------------------------
   2  * lan91c96.c
   3  * This is a driver for SMSC's LAN91C96 single-chip Ethernet device, based
   4  * on the SMC91111 driver from U-boot.
   5  *
   6  * (C) Copyright 2002
   7  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   8  * Rolf Offermanns <rof@sysgo.de>
   9  *
  10  * Copyright (C) 2001 Standard Microsystems Corporation (SMSC)
  11  *       Developed by Simple Network Magic Corporation (SNMC)
  12  * Copyright (C) 1996 by Erik Stahlman (ES)
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  27  *
  28  * Information contained in this file was obtained from the LAN91C96
  29  * manual from SMC.  To get a copy, if you really want one, you can find
  30  * information under www.smsc.com.
  31  *
  32  *
  33  * "Features" of the SMC chip:
  34  *   6144 byte packet memory. ( for the 91C96 )
  35  *   EEPROM for configuration
  36  *   AUI/TP selection  ( mine has 10Base2/10BaseT select )
  37  *
  38  * Arguments:
  39  *      io      = for the base address
  40  *      irq     = for the IRQ
  41  *
  42  * author:
  43  *      Erik Stahlman                           ( erik@vt.edu )
  44  *      Daris A Nevil                           ( dnevil@snmc.com )
  45  *
  46  *
  47  * Hardware multicast code from Peter Cammaert ( pc@denkart.be )
  48  *
  49  * Sources:
  50  *    o   SMSC LAN91C96 databook (www.smsc.com)
  51  *    o   smc91111.c (u-boot driver)
  52  *    o   smc9194.c (linux kernel driver)
  53  *    o   lan91c96.c (Intel Diagnostic Manager driver)
  54  *
  55  * History:
  56  *      04/30/03  Mathijs Haarman       Modified smc91111.c (u-boot version)
  57  *                                      for lan91c96
  58  *---------------------------------------------------------------------------
  59  */
  60
  61 #include <common.h>
  62 #include <command.h>
  63 #include <malloc.h>
  64 #include "lan91c96.h"
  65 #include <net.h>
  66
  67 /*------------------------------------------------------------------------
  68  *
  69  * Configuration options, for the experienced user to change.
  70  *
  71  -------------------------------------------------------------------------*/
  72
  73 /* Use power-down feature of the chip */
  74 #define POWER_DOWN      0
  75
  76 /*
  77  * Wait time for memory to be free.  This probably shouldn't be
  78  * tuned that much, as waiting for this means nothing else happens
  79  * in the system
  80 */
  81 #define MEMORY_WAIT_TIME 16
  82
  83 #define SMC_DEBUG 0
  84
  85 #if (SMC_DEBUG > 2 )
  86 #define PRINTK3(args...) printf(args)
  87 #else
  88 #define PRINTK3(args...)
  89 #endif
  90
  91 #if SMC_DEBUG > 1
  92 #define PRINTK2(args...) printf(args)
  93 #else
  94 #define PRINTK2(args...)
  95 #endif
  96
  97 #ifdef SMC_DEBUG
  98 #define PRINTK(args...) printf(args)
  99 #else
 100 #define PRINTK(args...)
 101 #endif
 102
 103
 104 /*------------------------------------------------------------------------
 105  *
 106  * The internal workings of the driver.  If you are changing anything
 107  * here with the SMC stuff, you should have the datasheet and know
 108  * what you are doing.
 109  *
 110  *------------------------------------------------------------------------
 111  */
 112 #define DRIVER_NAME "LAN91C96"
 113 #define SMC_ALLOC_MAX_TRY 5
 114 #define SMC_TX_TIMEOUT 30
 115
 116 #define ETH_ZLEN 60
 117
 118 #ifdef  CONFIG_LAN91C96_USE_32_BIT
 119 #define USE_32_BIT  1
 120 #else
 121 #undef USE_32_BIT
 122 #endif
 123
 124 /* See if a MAC address is defined in the current environment. If so use it. If not
 125  . print a warning and set the environment and other globals with the default.
 126  . If an EEPROM is present it really should be consulted.
 127 */
 128 static int smc_get_ethaddr(bd_t *bd, struct eth_device *dev);
 129 static int get_rom_mac(struct eth_device *dev, unsigned char *v_rom_mac);
 130
 131 /* ------------------------------------------------------------
 132  * Internal routines
 133  * ------------------------------------------------------------
 134  */
 135
 136 static unsigned char smc_mac_addr[] = { 0xc0, 0x00, 0x00, 0x1b, 0x62, 0x9c };
 137
 138 /*
 139  * This function must be called before smc_open() if you want to override
 140  * the default mac address.
 141  */
 142
 143 static void smc_set_mac_addr(const unsigned char *addr)
 144 {
 145         int i;
 146
 147         for (i = 0; i < sizeof (smc_mac_addr); i++) {
 148                 smc_mac_addr[i] = addr[i];
 149         }
 150 }
 151
 152 /***********************************************
 153  * Show available memory                       *
 154  ***********************************************/
 155 void dump_memory_info(struct eth_device *dev)
 156 {
 157         word mem_info;
 158         word old_bank;
 159
 160         old_bank = SMC_inw(dev, LAN91C96_BANK_SELECT) & 0xF;
 161
 162         SMC_SELECT_BANK(dev, 0);
 163         mem_info = SMC_inw(dev, LAN91C96_MIR);
 164         PRINTK2 ("Memory: %4d available\n", (mem_info >> 8) * 2048);
 165
 166         SMC_SELECT_BANK(dev, old_bank);
 167 }
 168
 169 /*
 170  * A rather simple routine to print out a packet for debugging purposes.
 171  */
 172 #if SMC_DEBUG > 2
 173 static void print_packet (byte *, int);
 174 #endif
 175
 176 static int poll4int (struct eth_device *dev, byte mask, int timeout)
 177 {
 178         int tmo = get_timer (0) + timeout * CONFIG_SYS_HZ;
 179         int is_timeout = 0;
 180         word old_bank = SMC_inw(dev, LAN91C96_BANK_SELECT);
 181
 182         PRINTK2 ("Polling...\n");
 183         SMC_SELECT_BANK(dev, 2);
 184         while ((SMC_inw(dev, LAN91C96_INT_STATS) & mask) == 0) {
 185                 if (get_timer (0) >= tmo) {
 186                         is_timeout = 1;
 187                         break;
 188                 }
 189         }
 190
 191         /* restore old bank selection */
 192         SMC_SELECT_BANK(dev, old_bank);
 193
 194         if (is_timeout)
 195                 return 1;
 196         else
 197                 return 0;
 198 }
 199
 200 /*
 201  * Function: smc_reset
 202  * Purpose:
 203  *      This sets the SMC91111 chip to its normal state, hopefully from whatever
 204  *      mess that any other DOS driver has put it in.
 205  *
 206  * Maybe I should reset more registers to defaults in here?  SOFTRST  should
 207  * do that for me.
 208  *
 209  * Method:
 210  *      1.  send a SOFT RESET
 211  *      2.  wait for it to finish
 212  *      3.  enable autorelease mode
 213  *      4.  reset the memory management unit
 214  *      5.  clear all interrupts
 215  *
 216 */
 217 static void smc_reset(struct eth_device *dev)
 218 {
 219         PRINTK2("%s:smc_reset\n", dev->name);
 220
 221         /* This resets the registers mostly to defaults, but doesn't
 222            affect EEPROM.  That seems unnecessary */
 223         SMC_SELECT_BANK(dev, 0);
 224         SMC_outw(dev, LAN91C96_RCR_SOFT_RST, LAN91C96_RCR);
 225
 226         udelay (10);
 227
 228         /* Disable transmit and receive functionality */
 229         SMC_outw(dev, 0, LAN91C96_RCR);
 230         SMC_outw(dev, 0, LAN91C96_TCR);
 231
 232         /* set the control register */
 233         SMC_SELECT_BANK(dev, 1);
 234         SMC_outw(dev, SMC_inw(dev, LAN91C96_CONTROL) | LAN91C96_CTR_BIT_8,
 235                           LAN91C96_CONTROL);
 236
 237         /* Disable all interrupts */
 238         SMC_outb(dev, 0, LAN91C96_INT_MASK);
 239 }
 240
 241 /*
 242  * Function: smc_enable
 243  * Purpose: let the chip talk to the outside work
 244  * Method:
 245  *      1.  Initialize the Memory Configuration Register
 246  *      2.  Enable the transmitter
 247  *      3.  Enable the receiver
 248 */
 249 static void smc_enable(struct eth_device *dev)
 250 {
 251         PRINTK2("%s:smc_enable\n", dev->name);
 252         SMC_SELECT_BANK(dev, 0);
 253
 254         /* Initialize the Memory Configuration Register. See page
 255            49 of the LAN91C96 data sheet for details. */
 256         SMC_outw(dev, LAN91C96_MCR_TRANSMIT_PAGES, LAN91C96_MCR);
 257
 258         /* Initialize the Transmit Control Register */
 259         SMC_outw(dev, LAN91C96_TCR_TXENA, LAN91C96_TCR);
 260         /* Initialize the Receive Control Register
 261          * FIXME:
 262          * The promiscuous bit set because I could not receive ARP reply
 263          * packets from the server when I send a ARP request. It only works
 264          * when I set the promiscuous bit
 265          */
 266         SMC_outw(dev, LAN91C96_RCR_RXEN | LAN91C96_RCR_PRMS, LAN91C96_RCR);
 267 }
 268
 269 /*
 270  * Function: smc_shutdown
 271  * Purpose:  closes down the SMC91xxx chip.
 272  * Method:
 273  *      1. zero the interrupt mask
 274  *      2. clear the enable receive flag
 275  *      3. clear the enable xmit flags
 276  *
 277  * TODO:
 278  *   (1) maybe utilize power down mode.
 279  *      Why not yet?  Because while the chip will go into power down mode,
 280  *      the manual says that it will wake up in response to any I/O requests
 281  *      in the register space.   Empirical results do not show this working.
 282  */
 283 static void smc_shutdown(struct eth_device *dev)
 284 {
 285         PRINTK2("%s:smc_shutdown\n", dev->name);
 286
 287         /* no more interrupts for me */
 288         SMC_SELECT_BANK(dev, 2);
 289         SMC_outb(dev, 0, LAN91C96_INT_MASK);
 290
 291         /* and tell the card to stay away from that nasty outside world */
 292         SMC_SELECT_BANK(dev, 0);
 293         SMC_outb(dev, 0, LAN91C96_RCR);
 294         SMC_outb(dev, 0, LAN91C96_TCR);
 295 }
 296
 297
 298 /*
 299  * Function:  smc_hardware_send_packet(struct net_device * )
 300  * Purpose:
 301  *      This sends the actual packet to the SMC9xxx chip.
 302  *
 303  * Algorithm:
 304  *      First, see if a saved_skb is available.
 305  *              ( this should NOT be called if there is no 'saved_skb'
 306  *      Now, find the packet number that the chip allocated
 307  *      Point the data pointers at it in memory
 308  *      Set the length word in the chip's memory
 309  *      Dump the packet to chip memory
 310  *      Check if a last byte is needed ( odd length packet )
 311  *              if so, set the control flag right
 312  *      Tell the card to send it
 313  *      Enable the transmit interrupt, so I know if it failed
 314  *      Free the kernel data if I actually sent it.
 315  */
 316 static int smc_send_packet(struct eth_device *dev, volatile void *packet,
 317                 int packet_length)
 318 {
 319         byte packet_no;
 320         unsigned long ioaddr;
 321         byte *buf;
 322         int length;
 323         int numPages;
 324         int try = 0;
 325         int time_out;
 326         byte status;
 327
 328
 329         PRINTK3("%s:smc_hardware_send_packet\n", dev->name);
 330
 331         length = ETH_ZLEN < packet_length ? packet_length : ETH_ZLEN;
 332
 333         /* allocate memory
 334          ** The MMU wants the number of pages to be the number of 256 bytes
 335          ** 'pages', minus 1 ( since a packet can't ever have 0 pages :) )
 336          **
 337          ** The 91C111 ignores the size bits, but the code is left intact
 338          ** for backwards and future compatibility.
 339          **
 340          ** Pkt size for allocating is data length +6 (for additional status
 341          ** words, length and ctl!)
 342          **
 343          ** If odd size then last byte is included in this header.
 344          */
 345         numPages = ((length & 0xfffe) + 6);
 346         numPages >>= 8;                         /* Divide by 256 */
 347
 348         if (numPages > 7) {
 349                 printf("%s: Far too big packet error. \n", dev->name);
 350                 return 0;
 351         }
 352
 353         /* now, try to allocate the memory */
 354
 355         SMC_SELECT_BANK(dev, 2);
 356         SMC_outw(dev, LAN91C96_MMUCR_ALLOC_TX | numPages, LAN91C96_MMU);
 357
 358   again:
 359         try++;
 360         time_out = MEMORY_WAIT_TIME;
 361         do {
 362                 status = SMC_inb(dev, LAN91C96_INT_STATS);
 363                 if (status & LAN91C96_IST_ALLOC_INT) {
 364
 365                         SMC_outb(dev, LAN91C96_IST_ALLOC_INT,
 366                                         LAN91C96_INT_STATS);
 367                         break;
 368                 }
 369         } while (--time_out);
 370
 371         if (!time_out) {
 372                 PRINTK2 ("%s: memory allocation, try %d failed ...\n",
 373                                  dev->name, try);
 374                 if (try < SMC_ALLOC_MAX_TRY)
 375                         goto again;
 376                 else
 377                         return 0;
 378         }
 379
 380         PRINTK2 ("%s: memory allocation, try %d succeeded ...\n",
 381                          dev->name, try);
 382
 383         /* I can send the packet now.. */
 384
 385         ioaddr = dev->iobase;
 386
 387         buf = (byte *) packet;
 388
 389         /* If I get here, I _know_ there is a packet slot waiting for me */
 390         packet_no = SMC_inb(dev, LAN91C96_ARR);
 391         if (packet_no & LAN91C96_ARR_FAILED) {
 392                 /* or isn't there?  BAD CHIP! */
 393                 printf("%s: Memory allocation failed. \n", dev->name);
 394                 return 0;
 395         }
 396
 397         /* we have a packet address, so tell the card to use it */
 398         SMC_outb(dev, packet_no, LAN91C96_PNR);
 399
 400         /* point to the beginning of the packet */
 401         SMC_outw(dev, LAN91C96_PTR_AUTO_INCR, LAN91C96_POINTER);
 402
 403         PRINTK3("%s: Trying to xmit packet of length %x\n",
 404                          dev->name, length);
 405
 406 #if SMC_DEBUG > 2
 407         printf ("Transmitting Packet\n");
 408         print_packet (buf, length);
 409 #endif
 410
 411         /* send the packet length ( +6 for status, length and ctl byte )
 412            and the status word ( set to zeros ) */
 413 #ifdef USE_32_BIT
 414         SMC_outl(dev, (length + 6) << 16, LAN91C96_DATA_HIGH);
 415 #else
 416         SMC_outw(dev, 0, LAN91C96_DATA_HIGH);
 417         /* send the packet length ( +6 for status words, length, and ctl */
 418         SMC_outw(dev, (length + 6), LAN91C96_DATA_HIGH);
 419 #endif /* USE_32_BIT */
 420
 421         /* send the actual data
 422          * I _think_ it's faster to send the longs first, and then
 423          * mop up by sending the last word.  It depends heavily
 424          * on alignment, at least on the 486.  Maybe it would be
 425          * a good idea to check which is optimal?  But that could take
 426          * almost as much time as is saved?
 427          */
 428 #ifdef USE_32_BIT
 429         SMC_outsl(dev, LAN91C96_DATA_HIGH, buf, length >> 2);
 430         if (length & 0x2)
 431                 SMC_outw(dev, *((word *) (buf + (length & 0xFFFFFFFC))),
 432                                   LAN91C96_DATA_HIGH);
 433 #else
 434         SMC_outsw(dev, LAN91C96_DATA_HIGH, buf, (length) >> 1);
 435 #endif /* USE_32_BIT */
 436
 437         /* Send the last byte, if there is one.   */
 438         if ((length & 1) == 0) {
 439                 SMC_outw(dev, 0, LAN91C96_DATA_HIGH);
 440         } else {
 441                 SMC_outw(dev, buf[length - 1] | 0x2000, LAN91C96_DATA_HIGH);
 442         }
 443
 444         /* and let the chipset deal with it */
 445         SMC_outw(dev, LAN91C96_MMUCR_ENQUEUE, LAN91C96_MMU);
 446
 447         /* poll for TX INT */
 448         if (poll4int (dev, LAN91C96_MSK_TX_INT, SMC_TX_TIMEOUT)) {
 449                 /* sending failed */
 450                 PRINTK2("%s: TX timeout, sending failed...\n", dev->name);
 451
 452                 /* release packet */
 453                 SMC_outw(dev, LAN91C96_MMUCR_RELEASE_TX, LAN91C96_MMU);
 454
 455                 /* wait for MMU getting ready (low) */
 456                 while (SMC_inw(dev, LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY)
 457                         udelay (10);
 458
 459                 PRINTK2("MMU ready\n");
 460
 461
 462                 return 0;
 463         } else {
 464                 /* ack. int */
 465                 SMC_outw(dev, LAN91C96_IST_TX_INT, LAN91C96_INT_STATS);
 466
 467                 PRINTK2("%s: Sent packet of length %d \n", dev->name, length);
 468
 469                 /* release packet */
 470                 SMC_outw(dev, LAN91C96_MMUCR_RELEASE_TX, LAN91C96_MMU);
 471
 472                 /* wait for MMU getting ready (low) */
 473                 while (SMC_inw(dev, LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY)
 474                         udelay (10);
 475
 476                 PRINTK2 ("MMU ready\n");
 477         }
 478
 479         return length;
 480 }
 481
 482
 483 /*
 484  * Open and Initialize the board
 485  *
 486  * Set up everything, reset the card, etc ..
 487  *
 488  */
 489 static int smc_open(bd_t *bd, struct eth_device *dev)
 490 {
 491         int i, err;                     /* used to set hw ethernet address */
 492
 493         PRINTK2("%s:smc_open\n", dev->name);
 494
 495         /* reset the hardware */
 496
 497         smc_reset(dev);
 498         smc_enable(dev);
 499
 500         SMC_SELECT_BANK(dev, 1);
 501         /* set smc_mac_addr, and sync it with u-boot globals */
 502         err = smc_get_ethaddr(bd, dev);
 503         if (err < 0)
 504                 return -1;
 505 #ifdef USE_32_BIT
 506         for (i = 0; i < 6; i += 2) {
 507                 word address;
 508
 509                 address = smc_mac_addr[i + 1] << 8;
 510                 address |= smc_mac_addr[i];
 511                 SMC_outw(dev, address, LAN91C96_IA0 + i);
 512         }
 513 #else
 514         for (i = 0; i < 6; i++)
 515                 SMC_outb(dev, smc_mac_addr[i], LAN91C96_IA0 + i);
 516 #endif
 517         return 0;
 518 }
 519
 520 /*-------------------------------------------------------------
 521  *
 522  * smc_rcv -  receive a packet from the card
 523  *
 524  * There is ( at least ) a packet waiting to be read from
 525  * chip-memory.
 526  *
 527  * o Read the status
 528  * o If an error, record it
 529  * o otherwise, read in the packet
 530  *-------------------------------------------------------------
 531  */
 532 static int smc_rcv(struct eth_device *dev)
 533 {
 534         int packet_number;
 535         word status;
 536         word packet_length;
 537         int is_error = 0;
 538
 539 #ifdef USE_32_BIT
 540         dword stat_len;
 541 #endif
 542
 543
 544         SMC_SELECT_BANK(dev, 2);
 545         packet_number = SMC_inw(dev, LAN91C96_FIFO);
 546
 547         if (packet_number & LAN91C96_FIFO_RXEMPTY) {
 548                 return 0;
 549         }
 550
 551         PRINTK3("%s:smc_rcv\n", dev->name);
 552         /*  start reading from the start of the packet */
 553         SMC_outw(dev, LAN91C96_PTR_READ | LAN91C96_PTR_RCV |
 554                           LAN91C96_PTR_AUTO_INCR, LAN91C96_POINTER);
 555
 556         /* First two words are status and packet_length */
 557 #ifdef USE_32_BIT
 558         stat_len = SMC_inl(dev, LAN91C96_DATA_HIGH);
 559         status = stat_len & 0xffff;
 560         packet_length = stat_len >> 16;
 561 #else
 562         status = SMC_inw(dev, LAN91C96_DATA_HIGH);
 563         packet_length = SMC_inw(dev, LAN91C96_DATA_HIGH);
 564 #endif
 565
 566         packet_length &= 0x07ff;        /* mask off top bits */
 567
 568         PRINTK2 ("RCV: STATUS %4x LENGTH %4x\n", status, packet_length);
 569
 570         if (!(status & FRAME_FILTER)) {
 571                 /* Adjust for having already read the first two words */
 572                 packet_length -= 4;             /*4; */
 573
 574
 575                 /* set odd length for bug in LAN91C111, */
 576                 /* which never sets RS_ODDFRAME */
 577                 /* TODO ? */
 578
 579
 580 #ifdef USE_32_BIT
 581                 PRINTK3 (" Reading %d dwords (and %d bytes) \n",
 582                          packet_length >> 2, packet_length & 3);
 583                 /* QUESTION:  Like in the TX routine, do I want
 584                    to send the DWORDs or the bytes first, or some
 585                    mixture.  A mixture might improve already slow PIO
 586                    performance  */
 587                 SMC_insl(dev, LAN91C96_DATA_HIGH, NetRxPackets[0],
 588                                 packet_length >> 2);
 589                 /* read the left over bytes */
 590                 if (packet_length & 3) {
 591                         int i;
 592
 593                         byte *tail = (byte *) (NetRxPackets[0] + (packet_length & ~3));
 594                         dword leftover = SMC_inl(dev, LAN91C96_DATA_HIGH);
 595
 596                         for (i = 0; i < (packet_length & 3); i++)
 597                                 *tail++ = (byte) (leftover >> (8 * i)) & 0xff;
 598                 }
 599 #else
 600                 PRINTK3 (" Reading %d words and %d byte(s) \n",
 601                                  (packet_length >> 1), packet_length & 1);
 602                 SMC_insw(dev, LAN91C96_DATA_HIGH, NetRxPackets[0],
 603                                 packet_length >> 1);
 604
 605 #endif /* USE_32_BIT */
 606
 607 #if     SMC_DEBUG > 2
 608                 printf ("Receiving Packet\n");
 609                 print_packet((byte *)NetRxPackets[0], packet_length);
 610 #endif
 611         } else {
 612                 /* error ... */
 613                 /* TODO ? */
 614                 is_error = 1;
 615         }
 616
 617         while (SMC_inw(dev, LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY)
 618                 udelay (1);             /* Wait until not busy */
 619
 620         /*  error or good, tell the card to get rid of this packet */
 621         SMC_outw(dev, LAN91C96_MMUCR_RELEASE_RX, LAN91C96_MMU);
 622
 623         while (SMC_inw(dev, LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY)
 624                 udelay (1);             /* Wait until not busy */
 625
 626         if (!is_error) {
 627                 /* Pass the packet up to the protocol layers. */
 628                 NetReceive (NetRxPackets[0], packet_length);
 629                 return packet_length;
 630         } else {
 631                 return 0;
 632         }
 633
 634 }
 635
 636 /*----------------------------------------------------
 637  * smc_close
 638  *
 639  * this makes the board clean up everything that it can
 640  * and not talk to the outside world.   Caused by
 641  * an 'ifconfig ethX down'
 642  *
 643  -----------------------------------------------------*/
 644 static int smc_close(struct eth_device *dev)
 645 {
 646         PRINTK2("%s:smc_close\n", dev->name);
 647
 648         /* clear everything */
 649         smc_shutdown(dev);
 650
 651         return 0;
 652 }
 653
 654 #if SMC_DEBUG > 2
 655 static void print_packet(byte *buf, int length)
 656 {
 657 #if 0
 658         int i;
 659         int remainder;
 660         int lines;
 661
 662         printf ("Packet of length %d \n", length);
 663
 664         lines = length / 16;
 665         remainder = length % 16;
 666
 667         for (i = 0; i < lines; i++) {
 668                 int cur;
 669
 670                 for (cur = 0; cur < 8; cur++) {
 671                         byte a, b;
 672
 673                         a = *(buf++);
 674                         b = *(buf++);
 675                         printf ("%02x%02x ", a, b);
 676                 }
 677                 printf ("\n");
 678         }
 679         for (i = 0; i < remainder / 2; i++) {
 680                 byte a, b;
 681
 682                 a = *(buf++);
 683                 b = *(buf++);
 684                 printf ("%02x%02x ", a, b);
 685         }
 686         printf ("\n");
 687 #endif /* 0 */
 688 }
 689 #endif /* SMC_DEBUG > 2 */
 690
 691 static int  lan91c96_init(struct eth_device *dev, bd_t *bd)
 692 {
 693         return smc_open(bd, dev);
 694 }
 695
 696 static void lan91c96_halt(struct eth_device *dev)
 697 {
 698         smc_close(dev);
 699 }
 700
 701 static int lan91c96_recv(struct eth_device *dev)
 702 {
 703         return smc_rcv(dev);
 704 }
 705
 706 static int lan91c96_send(struct eth_device *dev, volatile void *packet,
 707                 int length)
 708 {
 709         return smc_send_packet(dev, packet, length);
 710 }
 711
 712 /* smc_get_ethaddr
 713  *
 714  * This checks both the environment and the ROM for an ethernet address. If
 715  * found, the environment takes precedence.
 716  */
 717
 718 static int smc_get_ethaddr(bd_t *bd, struct eth_device *dev)
 719 {
 720         uchar v_mac[6];
 721
 722         if (!eth_getenv_enetaddr("ethaddr", v_mac)) {
 723                 /* get ROM mac value if any */
 724                 if (!get_rom_mac(dev, v_mac)) {
 725                         printf("\n*** ERROR: ethaddr is NOT set !!\n");
 726                         return -1;
 727                 }
 728                 eth_setenv_enetaddr("ethaddr", v_mac);
 729         }
 730
 731         smc_set_mac_addr(v_mac); /* use old function to update smc default */
 732         PRINTK("Using MAC Address %pM\n", v_mac);
 733         return 0;
 734 }
 735
 736 /*
 737  * get_rom_mac()
 738  * Note, this has omly been tested for the OMAP730 P2.
 739  */
 740
 741 static int get_rom_mac(struct eth_device *dev, unsigned char *v_rom_mac)
 742 {
 743 #ifdef HARDCODE_MAC     /* used for testing or to supress run time warnings */
 744         char hw_mac_addr[] = { 0x02, 0x80, 0xad, 0x20, 0x31, 0xb8 };
 745
 746         memcpy (v_rom_mac, hw_mac_addr, 6);
 747         return (1);
 748 #else
 749         int i;
 750         SMC_SELECT_BANK(dev, 1);
 751         for (i=0; i<6; i++)
 752         {
 753                 v_rom_mac[i] = SMC_inb(dev, LAN91C96_IA0 + i);
 754         }
 755         return (1);
 756 #endif
 757 }
 758
 759 /* Structure to detect the device IDs */
 760 struct id_type {
 761         u8 id;
 762         char *name;
 763 };
 764 static struct id_type supported_chips[] = {
 765         {0, ""}, /* Dummy entry to prevent id check failure */
 766         {9, "LAN91C110"},
 767         {8, "LAN91C100FD"},
 768         {7, "LAN91C100"},
 769         {5, "LAN91C95"},
 770         {4, "LAN91C94/LAN91C96"},
 771         {3, "LAN91C90/LAN91C92"},
 772 };
 773 /* lan91c96_detect_chip
 774  * See:
 775  * http://www.embeddedsys.com/subpages/resources/images/documents/LAN91C96_datasheet.pdf
 776  * page 71 - that is the closest we get to detect this device
 777  */
 778 static int lan91c96_detect_chip(struct eth_device *dev)
 779 {
 780         u8 chip_id;
 781         int r;
 782         SMC_SELECT_BANK(dev, 3);
 783         chip_id = SMC_inw(dev, 0xA) & LAN91C96_REV_REVID;
 784         SMC_SELECT_BANK(dev, 0);
 785         for (r = 0; r < sizeof(supported_chips) / sizeof(struct id_type); r++)
 786                 if (chip_id == supported_chips[r].id)
 787                         return r;
 788         return 0;
 789 }
 790
 791 int lan91c96_initialize(u8 dev_num, int base_addr)
 792 {
 793         struct eth_device *dev;
 794         int r = 0;
 795
 796         dev = malloc(sizeof(*dev));
 797         if (!dev) {
 798                 return 0;
 799         }
 800         memset(dev, 0, sizeof(*dev));
 801
 802         dev->iobase = base_addr;
 803
 804         /* Try to detect chip. Will fail if not present. */
 805         r = lan91c96_detect_chip(dev);
 806         if (!r) {
 807                 free(dev);
 808                 return 0;
 809         }
 810         get_rom_mac(dev, dev->enetaddr);
 811
 812         dev->init = lan91c96_init;
 813         dev->halt = lan91c96_halt;
 814         dev->send = lan91c96_send;
 815         dev->recv = lan91c96_recv;
 816         sprintf(dev->name, "%s-%hu", supported_chips[r].name, dev_num);
 817
 818         eth_register(dev);
 819         return 0;
 820 }