drivers/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 "lan91c96.h"
  64 #include <net.h>
  65
  66 #ifdef CONFIG_DRIVER_LAN91C96
  67
  68 #if (CONFIG_COMMANDS & CFG_CMD_NET)
  69
  70 /*------------------------------------------------------------------------
  71  *
  72  * Configuration options, for the experienced user to change.
  73  *
  74  -------------------------------------------------------------------------*/
  75
  76 /* Use power-down feature of the chip */
  77 #define POWER_DOWN      0
  78
  79 /*
  80  * Wait time for memory to be free.  This probably shouldn't be
  81  * tuned that much, as waiting for this means nothing else happens
  82  * in the system
  83 */
  84 #define MEMORY_WAIT_TIME 16
  85
  86 #define SMC_DEBUG 0
  87
  88 #if (SMC_DEBUG > 2 )
  89 #define PRINTK3(args...) printf(args)
  90 #else
  91 #define PRINTK3(args...)
  92 #endif
  93
  94 #if SMC_DEBUG > 1
  95 #define PRINTK2(args...) printf(args)
  96 #else
  97 #define PRINTK2(args...)
  98 #endif
  99
 100 #ifdef SMC_DEBUG
 101 #define PRINTK(args...) printf(args)
 102 #else
 103 #define PRINTK(args...)
 104 #endif
 105
 106
 107 /*------------------------------------------------------------------------
 108  *
 109  * The internal workings of the driver.  If you are changing anything
 110  * here with the SMC stuff, you should have the datasheet and know
 111  * what you are doing.
 112  *
 113  *------------------------------------------------------------------------
 114  */
 115 #define CARDNAME "LAN91C96"
 116
 117 #define SMC_BASE_ADDRESS CONFIG_LAN91C96_BASE
 118
 119 #define SMC_DEV_NAME "LAN91C96"
 120 #define SMC_ALLOC_MAX_TRY 5
 121 #define SMC_TX_TIMEOUT 30
 122
 123 #define ETH_ZLEN 60
 124
 125 #ifdef  CONFIG_LAN91C96_USE_32_BIT
 126 #define USE_32_BIT  1
 127 #else
 128 #undef USE_32_BIT
 129 #endif
 130
 131 /*-----------------------------------------------------------------
 132  *
 133  *  The driver can be entered at any of the following entry points.
 134  *
 135  *-----------------------------------------------------------------
 136  */
 137
 138 extern int eth_init (bd_t * bd);
 139 extern void eth_halt (void);
 140 extern int eth_rx (void);
 141 extern int eth_send (volatile void *packet, int length);
 142 static int smc_hw_init (void);
 143
 144 /*
 145  * This is called by  register_netdev().  It is responsible for
 146  * checking the portlist for the SMC9000 series chipset.  If it finds
 147  * one, then it will initialize the device, find the hardware information,
 148  * and sets up the appropriate device parameters.
 149  * NOTE: Interrupts are *OFF* when this procedure is called.
 150  *
 151  * NB:This shouldn't be static since it is referred to externally.
 152  */
 153 int smc_init (void);
 154
 155 /*
 156  * This is called by  unregister_netdev().  It is responsible for
 157  * cleaning up before the driver is finally unregistered and discarded.
 158  */
 159 void smc_destructor (void);
 160
 161 /*
 162  * The kernel calls this function when someone wants to use the device,
 163  * typically 'ifconfig ethX up'.
 164  */
 165 static int smc_open (void);
 166
 167
 168 /*
 169  * This is called by the kernel in response to 'ifconfig ethX down'.  It
 170  * is responsible for cleaning up everything that the open routine
 171  * does, and maybe putting the card into a powerdown state.
 172  */
 173 static int smc_close (void);
 174
 175 /*
 176  * This is a separate procedure to handle the receipt of a packet, to
 177  * leave the interrupt code looking slightly cleaner
 178  */
 179 static int smc_rcv (void);
 180
 181
 182 /* ------------------------------------------------------------
 183  * Internal routines
 184  * ------------------------------------------------------------
 185  */
 186
 187 static char smc_mac_addr[] = { 0xc0, 0x00, 0x00, 0x1b, 0x62, 0x9c };
 188
 189 /*
 190  * This function must be called before smc_open() if you want to override
 191  * the default mac address.
 192  */
 193
 194 void smc_set_mac_addr (const char *addr)
 195 {
 196         int i;
 197
 198         for (i = 0; i < sizeof (smc_mac_addr); i++) {
 199                 smc_mac_addr[i] = addr[i];
 200         }
 201 }
 202
 203 /*
 204  * smc_get_macaddr is no longer used. If you want to override the default
 205  * mac address, call smc_get_mac_addr as a part of the board initialisation.
 206  */
 207
 208 #if 0
 209 void smc_get_macaddr (byte * addr)
 210 {
 211         /* MAC ADDRESS AT FLASHBLOCK 1 / OFFSET 0x10 */
 212         unsigned char *dnp1110_mac = (unsigned char *) (0xE8000000 + 0x20010);
 213         int i;
 214
 215
 216         for (i = 0; i < 6; i++) {
 217                 addr[0] = *(dnp1110_mac + 0);
 218                 addr[1] = *(dnp1110_mac + 1);
 219                 addr[2] = *(dnp1110_mac + 2);
 220                 addr[3] = *(dnp1110_mac + 3);
 221                 addr[4] = *(dnp1110_mac + 4);
 222                 addr[5] = *(dnp1110_mac + 5);
 223         }
 224 }
 225 #endif /* 0 */
 226
 227 /***********************************************
 228  * Show available memory                       *
 229  ***********************************************/
 230 void dump_memory_info (void)
 231 {
 232         word mem_info;
 233         word old_bank;
 234
 235         old_bank = SMC_inw (LAN91C96_BANK_SELECT) & 0xF;
 236
 237         SMC_SELECT_BANK (0);
 238         mem_info = SMC_inw (LAN91C96_MIR);
 239         PRINTK2 ("Memory: %4d available\n", (mem_info >> 8) * 2048);
 240
 241         SMC_SELECT_BANK (old_bank);
 242 }
 243
 244 /*
 245  * A rather simple routine to print out a packet for debugging purposes.
 246  */
 247 #if SMC_DEBUG > 2
 248 static void print_packet (byte *, int);
 249 #endif
 250
 251 /* #define tx_done(dev) 1 */
 252
 253
 254 /* this does a soft reset on the device */
 255 static void smc_reset (void);
 256
 257 /* Enable Interrupts, Receive, and Transmit */
 258 static void smc_enable (void);
 259
 260 /* this puts the device in an inactive state */
 261 static void smc_shutdown (void);
 262
 263
 264 static int poll4int (byte mask, int timeout)
 265 {
 266         int tmo = get_timer (0) + timeout * CFG_HZ;
 267         int is_timeout = 0;
 268         word old_bank = SMC_inw (LAN91C96_BANK_SELECT);
 269
 270         PRINTK2 ("Polling...\n");
 271         SMC_SELECT_BANK (2);
 272         while ((SMC_inw (LAN91C96_INT_STATS) & mask) == 0) {
 273                 if (get_timer (0) >= tmo) {
 274                         is_timeout = 1;
 275                         break;
 276                 }
 277         }
 278
 279         /* restore old bank selection */
 280         SMC_SELECT_BANK (old_bank);
 281
 282         if (is_timeout)
 283                 return 1;
 284         else
 285                 return 0;
 286 }
 287
 288 /*
 289  * Function: smc_reset( void )
 290  * Purpose:
 291  *      This sets the SMC91111 chip to its normal state, hopefully from whatever
 292  *      mess that any other DOS driver has put it in.
 293  *
 294  * Maybe I should reset more registers to defaults in here?  SOFTRST  should
 295  * do that for me.
 296  *
 297  * Method:
 298  *      1.  send a SOFT RESET
 299  *      2.  wait for it to finish
 300  *      3.  enable autorelease mode
 301  *      4.  reset the memory management unit
 302  *      5.  clear all interrupts
 303  *
 304 */
 305 static void smc_reset (void)
 306 {
 307         PRINTK2 ("%s:smc_reset\n", SMC_DEV_NAME);
 308
 309         /* This resets the registers mostly to defaults, but doesn't
 310            affect EEPROM.  That seems unnecessary */
 311         SMC_SELECT_BANK (0);
 312         SMC_outw (LAN91C96_RCR_SOFT_RST, LAN91C96_RCR);
 313
 314         udelay (10);
 315
 316         /* Disable transmit and receive functionality */
 317         SMC_outw (0, LAN91C96_RCR);
 318         SMC_outw (0, LAN91C96_TCR);
 319
 320         /* set the control register */
 321         SMC_SELECT_BANK (1);
 322         SMC_outw (SMC_inw (LAN91C96_CONTROL) | LAN91C96_CTR_BIT_8,
 323                           LAN91C96_CONTROL);
 324
 325         /* Disable all interrupts */
 326         SMC_outb (0, LAN91C96_INT_MASK);
 327 }
 328
 329 /*
 330  * Function: smc_enable
 331  * Purpose: let the chip talk to the outside work
 332  * Method:
 333  *      1.  Initialize the Memory Configuration Register
 334  *      2.  Enable the transmitter
 335  *      3.  Enable the receiver
 336 */
 337 static void smc_enable ()
 338 {
 339         PRINTK2 ("%s:smc_enable\n", SMC_DEV_NAME);
 340         SMC_SELECT_BANK (0);
 341
 342         /* Initialize the Memory Configuration Register. See page
 343            49 of the LAN91C96 data sheet for details. */
 344         SMC_outw (LAN91C96_MCR_TRANSMIT_PAGES, LAN91C96_MCR);
 345
 346         /* Initialize the Transmit Control Register */
 347         SMC_outw (LAN91C96_TCR_TXENA, LAN91C96_TCR);
 348         /* Initialize the Receive Control Register
 349          * FIXME:
 350          * The promiscuous bit set because I could not receive ARP reply
 351          * packets from the server when I send a ARP request. It only works
 352          * when I set the promiscuous bit
 353          */
 354         SMC_outw (LAN91C96_RCR_RXEN | LAN91C96_RCR_PRMS, LAN91C96_RCR);
 355 }
 356
 357 /*
 358  * Function: smc_shutdown
 359  * Purpose:  closes down the SMC91xxx chip.
 360  * Method:
 361  *      1. zero the interrupt mask
 362  *      2. clear the enable receive flag
 363  *      3. clear the enable xmit flags
 364  *
 365  * TODO:
 366  *   (1) maybe utilize power down mode.
 367  *      Why not yet?  Because while the chip will go into power down mode,
 368  *      the manual says that it will wake up in response to any I/O requests
 369  *      in the register space.   Empirical results do not show this working.
 370  */
 371 static void smc_shutdown ()
 372 {
 373         PRINTK2 (CARDNAME ":smc_shutdown\n");
 374
 375         /* no more interrupts for me */
 376         SMC_SELECT_BANK (2);
 377         SMC_outb (0, LAN91C96_INT_MASK);
 378
 379         /* and tell the card to stay away from that nasty outside world */
 380         SMC_SELECT_BANK (0);
 381         SMC_outb (0, LAN91C96_RCR);
 382         SMC_outb (0, LAN91C96_TCR);
 383 }
 384
 385
 386 /*
 387  * Function:  smc_hardware_send_packet(struct net_device * )
 388  * Purpose:
 389  *      This sends the actual packet to the SMC9xxx chip.
 390  *
 391  * Algorithm:
 392  *      First, see if a saved_skb is available.
 393  *              ( this should NOT be called if there is no 'saved_skb'
 394  *      Now, find the packet number that the chip allocated
 395  *      Point the data pointers at it in memory
 396  *      Set the length word in the chip's memory
 397  *      Dump the packet to chip memory
 398  *      Check if a last byte is needed ( odd length packet )
 399  *              if so, set the control flag right
 400  *      Tell the card to send it
 401  *      Enable the transmit interrupt, so I know if it failed
 402  *      Free the kernel data if I actually sent it.
 403  */
 404 static int smc_send_packet (volatile void *packet, int packet_length)
 405 {
 406         byte packet_no;
 407         unsigned long ioaddr;
 408         byte *buf;
 409         int length;
 410         int numPages;
 411         int try = 0;
 412         int time_out;
 413         byte status;
 414
 415
 416         PRINTK3 ("%s:smc_hardware_send_packet\n", SMC_DEV_NAME);
 417
 418         length = ETH_ZLEN < packet_length ? packet_length : ETH_ZLEN;
 419
 420         /* allocate memory
 421          ** The MMU wants the number of pages to be the number of 256 bytes
 422          ** 'pages', minus 1 ( since a packet can't ever have 0 pages :) )
 423          **
 424          ** The 91C111 ignores the size bits, but the code is left intact
 425          ** for backwards and future compatibility.
 426          **
 427          ** Pkt size for allocating is data length +6 (for additional status
 428          ** words, length and ctl!)
 429          **
 430          ** If odd size then last byte is included in this header.
 431          */
 432         numPages = ((length & 0xfffe) + 6);
 433         numPages >>= 8;                         /* Divide by 256 */
 434
 435         if (numPages > 7) {
 436                 printf ("%s: Far too big packet error. \n", SMC_DEV_NAME);
 437                 return 0;
 438         }
 439
 440         /* now, try to allocate the memory */
 441
 442         SMC_SELECT_BANK (2);
 443         SMC_outw (LAN91C96_MMUCR_ALLOC_TX | numPages, LAN91C96_MMU);
 444
 445   again:
 446         try++;
 447         time_out = MEMORY_WAIT_TIME;
 448         do {
 449                 status = SMC_inb (LAN91C96_INT_STATS);
 450                 if (status & LAN91C96_IST_ALLOC_INT) {
 451
 452                         SMC_outb (LAN91C96_IST_ALLOC_INT, LAN91C96_INT_STATS);
 453                         break;
 454                 }
 455         } while (--time_out);
 456
 457         if (!time_out) {
 458                 PRINTK2 ("%s: memory allocation, try %d failed ...\n",
 459                                  SMC_DEV_NAME, try);
 460                 if (try < SMC_ALLOC_MAX_TRY)
 461                         goto again;
 462                 else
 463                         return 0;
 464         }
 465
 466         PRINTK2 ("%s: memory allocation, try %d succeeded ...\n",
 467                          SMC_DEV_NAME, try);
 468
 469         /* I can send the packet now.. */
 470
 471         ioaddr = SMC_BASE_ADDRESS;
 472
 473         buf = (byte *) packet;
 474
 475         /* If I get here, I _know_ there is a packet slot waiting for me */
 476         packet_no = SMC_inb (LAN91C96_ARR);
 477         if (packet_no & LAN91C96_ARR_FAILED) {
 478                 /* or isn't there?  BAD CHIP! */
 479                 printf ("%s: Memory allocation failed. \n", SMC_DEV_NAME);
 480                 return 0;
 481         }
 482
 483         /* we have a packet address, so tell the card to use it */
 484         SMC_outb (packet_no, LAN91C96_PNR);
 485
 486         /* point to the beginning of the packet */
 487         SMC_outw (LAN91C96_PTR_AUTO_INCR, LAN91C96_POINTER);
 488
 489         PRINTK3 ("%s: Trying to xmit packet of length %x\n",
 490                          SMC_DEV_NAME, length);
 491
 492 #if SMC_DEBUG > 2
 493         printf ("Transmitting Packet\n");
 494         print_packet (buf, length);
 495 #endif
 496
 497         /* send the packet length ( +6 for status, length and ctl byte )
 498            and the status word ( set to zeros ) */
 499 #ifdef USE_32_BIT
 500         SMC_outl ((length + 6) << 16, LAN91C96_DATA_HIGH);
 501 #else
 502         SMC_outw (0, LAN91C96_DATA_HIGH);
 503         /* send the packet length ( +6 for status words, length, and ctl */
 504         SMC_outw ((length + 6), LAN91C96_DATA_HIGH);
 505 #endif /* USE_32_BIT */
 506
 507         /* send the actual data
 508          * I _think_ it's faster to send the longs first, and then
 509          * mop up by sending the last word.  It depends heavily
 510          * on alignment, at least on the 486.  Maybe it would be
 511          * a good idea to check which is optimal?  But that could take
 512          * almost as much time as is saved?
 513          */
 514 #ifdef USE_32_BIT
 515         SMC_outsl (LAN91C96_DATA_HIGH, buf, length >> 2);
 516         if (length & 0x2)
 517                 SMC_outw (*((word *) (buf + (length & 0xFFFFFFFC))),
 518                                   LAN91C96_DATA_HIGH);
 519 #else
 520         SMC_outsw (LAN91C96_DATA_HIGH, buf, (length) >> 1);
 521 #endif /* USE_32_BIT */
 522
 523         /* Send the last byte, if there is one.   */
 524         if ((length & 1) == 0) {
 525                 SMC_outw (0, LAN91C96_DATA_HIGH);
 526         } else {
 527                 SMC_outw (buf[length - 1] | 0x2000, LAN91C96_DATA_HIGH);
 528         }
 529
 530         /* and let the chipset deal with it */
 531         SMC_outw (LAN91C96_MMUCR_ENQUEUE, LAN91C96_MMU);
 532
 533         /* poll for TX INT */
 534         if (poll4int (LAN91C96_MSK_TX_INT, SMC_TX_TIMEOUT)) {
 535                 /* sending failed */
 536                 PRINTK2 ("%s: TX timeout, sending failed...\n", SMC_DEV_NAME);
 537
 538                 /* release packet */
 539                 SMC_outw (LAN91C96_MMUCR_RELEASE_TX, LAN91C96_MMU);
 540
 541                 /* wait for MMU getting ready (low) */
 542                 while (SMC_inw (LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY) {
 543                         udelay (10);
 544                 }
 545
 546                 PRINTK2 ("MMU ready\n");
 547
 548
 549                 return 0;
 550         } else {
 551                 /* ack. int */
 552                 SMC_outw (LAN91C96_IST_TX_INT, LAN91C96_INT_STATS);
 553
 554                 PRINTK2 ("%s: Sent packet of length %d \n", SMC_DEV_NAME, length);
 555
 556                 /* release packet */
 557                 SMC_outw (LAN91C96_MMUCR_RELEASE_TX, LAN91C96_MMU);
 558
 559                 /* wait for MMU getting ready (low) */
 560                 while (SMC_inw (LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY) {
 561                         udelay (10);
 562                 }
 563
 564                 PRINTK2 ("MMU ready\n");
 565         }
 566
 567         return length;
 568 }
 569
 570 /*-------------------------------------------------------------------------
 571  * smc_destructor( struct net_device * dev )
 572  *   Input parameters:
 573  *      dev, pointer to the device structure
 574  *
 575  *   Output:
 576  *      None.
 577  *--------------------------------------------------------------------------
 578  */
 579 void smc_destructor ()
 580 {
 581         PRINTK2 (CARDNAME ":smc_destructor\n");
 582 }
 583
 584
 585 /*
 586  * Open and Initialize the board
 587  *
 588  * Set up everything, reset the card, etc ..
 589  *
 590  */
 591 static int smc_open ()
 592 {
 593         int i;                  /* used to set hw ethernet address */
 594
 595         PRINTK2 ("%s:smc_open\n", SMC_DEV_NAME);
 596
 597         /* reset the hardware */
 598
 599         smc_reset ();
 600         smc_enable ();
 601
 602         SMC_SELECT_BANK (1);
 603
 604         for (i = 0; i < 6; i += 2) {
 605                 word address;
 606
 607                 address = smc_mac_addr[i + 1] << 8;
 608                 address |= smc_mac_addr[i];
 609                 SMC_outw (address, LAN91C96_IA0 + i);
 610         }
 611         return 0;
 612 }
 613
 614 /*-------------------------------------------------------------
 615  *
 616  * smc_rcv -  receive a packet from the card
 617  *
 618  * There is ( at least ) a packet waiting to be read from
 619  * chip-memory.
 620  *
 621  * o Read the status
 622  * o If an error, record it
 623  * o otherwise, read in the packet
 624  *-------------------------------------------------------------
 625  */
 626 static int smc_rcv ()
 627 {
 628         int packet_number;
 629         word status;
 630         word packet_length;
 631         int is_error = 0;
 632
 633 #ifdef USE_32_BIT
 634         dword stat_len;
 635 #endif
 636
 637
 638         SMC_SELECT_BANK (2);
 639         packet_number = SMC_inw (LAN91C96_FIFO);
 640
 641         if (packet_number & LAN91C96_FIFO_RXEMPTY) {
 642                 return 0;
 643         }
 644
 645         PRINTK3 ("%s:smc_rcv\n", SMC_DEV_NAME);
 646         /*  start reading from the start of the packet */
 647         SMC_outw (LAN91C96_PTR_READ | LAN91C96_PTR_RCV |
 648                           LAN91C96_PTR_AUTO_INCR, LAN91C96_POINTER);
 649
 650         /* First two words are status and packet_length */
 651 #ifdef USE_32_BIT
 652         stat_len = SMC_inl (LAN91C96_DATA_HIGH);
 653         status = stat_len & 0xffff;
 654         packet_length = stat_len >> 16;
 655 #else
 656         status = SMC_inw (LAN91C96_DATA_HIGH);
 657         packet_length = SMC_inw (LAN91C96_DATA_HIGH);
 658 #endif
 659
 660         packet_length &= 0x07ff;        /* mask off top bits */
 661
 662         PRINTK2 ("RCV: STATUS %4x LENGTH %4x\n", status, packet_length);
 663
 664         if (!(status & FRAME_FILTER)) {
 665                 /* Adjust for having already read the first two words */
 666                 packet_length -= 4;             /*4; */
 667
 668
 669                 /* set odd length for bug in LAN91C111, */
 670                 /* which never sets RS_ODDFRAME */
 671                 /* TODO ? */
 672
 673
 674 #ifdef USE_32_BIT
 675                 PRINTK3 (" Reading %d dwords (and %d bytes) \n",
 676                          packet_length >> 2, packet_length & 3);
 677                 /* QUESTION:  Like in the TX routine, do I want
 678                    to send the DWORDs or the bytes first, or some
 679                    mixture.  A mixture might improve already slow PIO
 680                    performance  */
 681                 SMC_insl (LAN91C96_DATA_HIGH, NetRxPackets[0], packet_length >> 2);
 682                 /* read the left over bytes */
 683                 if (packet_length & 3) {
 684                         int i;
 685
 686                         byte *tail = (byte *) (NetRxPackets[0] + (packet_length & ~3));
 687                         dword leftover = SMC_inl (LAN91C96_DATA_HIGH);
 688
 689                         for (i = 0; i < (packet_length & 3); i++)
 690                                 *tail++ = (byte) (leftover >> (8 * i)) & 0xff;
 691                 }
 692 #else
 693                 PRINTK3 (" Reading %d words and %d byte(s) \n",
 694                                  (packet_length >> 1), packet_length & 1);
 695                 SMC_insw (LAN91C96_DATA_HIGH, NetRxPackets[0], packet_length >> 1);
 696
 697 #endif /* USE_32_BIT */
 698
 699 #if     SMC_DEBUG > 2
 700                 printf ("Receiving Packet\n");
 701                 print_packet (NetRxPackets[0], packet_length);
 702 #endif
 703         } else {
 704                 /* error ... */
 705                 /* TODO ? */
 706                 is_error = 1;
 707         }
 708
 709         while (SMC_inw (LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY)
 710                 udelay (1);             /* Wait until not busy */
 711
 712         /*  error or good, tell the card to get rid of this packet */
 713         SMC_outw (LAN91C96_MMUCR_RELEASE_RX, LAN91C96_MMU);
 714
 715         while (SMC_inw (LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY)
 716                 udelay (1);             /* Wait until not busy */
 717
 718         if (!is_error) {
 719                 /* Pass the packet up to the protocol layers. */
 720                 NetReceive (NetRxPackets[0], packet_length);
 721                 return packet_length;
 722         } else {
 723                 return 0;
 724         }
 725
 726 }
 727
 728 /*----------------------------------------------------
 729  * smc_close
 730  *
 731  * this makes the board clean up everything that it can
 732  * and not talk to the outside world.   Caused by
 733  * an 'ifconfig ethX down'
 734  *
 735  -----------------------------------------------------*/
 736 static int smc_close ()
 737 {
 738         PRINTK2 ("%s:smc_close\n", SMC_DEV_NAME);
 739
 740         /* clear everything */
 741         smc_shutdown ();
 742
 743         return 0;
 744 }
 745
 746 #if SMC_DEBUG > 2
 747 static void print_packet (byte * buf, int length)
 748 {
 749 #if 0
 750         int i;
 751         int remainder;
 752         int lines;
 753
 754         printf ("Packet of length %d \n", length);
 755
 756         lines = length / 16;
 757         remainder = length % 16;
 758
 759         for (i = 0; i < lines; i++) {
 760                 int cur;
 761
 762                 for (cur = 0; cur < 8; cur++) {
 763                         byte a, b;
 764
 765                         a = *(buf++);
 766                         b = *(buf++);
 767                         printf ("%02x%02x ", a, b);
 768                 }
 769                 printf ("\n");
 770         }
 771         for (i = 0; i < remainder / 2; i++) {
 772                 byte a, b;
 773
 774                 a = *(buf++);
 775                 b = *(buf++);
 776                 printf ("%02x%02x ", a, b);
 777         }
 778         printf ("\n");
 779 #endif /* 0 */
 780 }
 781 #endif /* SMC_DEBUG > 2 */
 782
 783 int eth_init (bd_t * bd)
 784 {
 785         smc_open ();
 786         return 0;
 787 }
 788
 789 void eth_halt ()
 790 {
 791         smc_close ();
 792 }
 793
 794 int eth_rx ()
 795 {
 796         return smc_rcv ();
 797 }
 798
 799 int eth_send (volatile void *packet, int length)
 800 {
 801         return smc_send_packet (packet, length);
 802 }
 803
 804 int eth_hw_init ()
 805 {
 806         return smc_hw_init ();
 807 }
 808
 809 /*-------------------------------------------------------------------------
 810  * smc_hw_init()
 811  *
 812  *   Function:
 813  *      Reset and enable the device, check if the I/O space location
 814  *      is correct
 815  *
 816  *   Input parameters:
 817  *      None
 818  *
 819  *   Output:
 820  *      0 --> success
 821  *      1 --> error
 822  *--------------------------------------------------------------------------
 823  */
 824 static int smc_hw_init ()
 825 {
 826         unsigned short status_test;
 827
 828         /* The attribute register of the LAN91C96 is located at address
 829            0x0e000000 on the lubbock platform */
 830         volatile unsigned *attaddr = (unsigned *) (0x0e000000);
 831
 832         /* first reset, then enable the device. Sequence is critical */
 833         attaddr[LAN91C96_ECOR] |= LAN91C96_ECOR_SRESET;
 834         udelay (100);
 835         attaddr[LAN91C96_ECOR] &= ~LAN91C96_ECOR_SRESET;
 836         attaddr[LAN91C96_ECOR] |= LAN91C96_ECOR_ENABLE;
 837
 838         /* force 16-bit mode */
 839         attaddr[LAN91C96_ECSR] &= ~LAN91C96_ECSR_IOIS8;
 840         udelay (100);
 841
 842         /* check if the I/O address is correct, the upper byte of the
 843            bank select register should read 0x33 */
 844
 845         status_test = SMC_inw (LAN91C96_BANK_SELECT);
 846         if ((status_test & 0xFF00) != 0x3300) {
 847                 printf ("Failed to initialize ethernetchip\n");
 848                 return 1;
 849         }
 850         return 0;
 851 }
 852
 853 #endif /* COMMANDS & CFG_NET */
 854
 855 #endif /* CONFIG_DRIVER_LAN91C96 */