1 // SPDX-License-Identifier: GPL-2.0+ 2 /*------------------------------------------------------------------------ 3 * lan91c96.c 4 * This is a driver for SMSC's LAN91C96 single-chip Ethernet device, based 5 * on the SMC91111 driver from U-Boot. 6 * 7 * (C) Copyright 2002 8 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 9 * Rolf Offermanns <rof (at) sysgo.de> 10 * 11 * Copyright (C) 2001 Standard Microsystems Corporation (SMSC) 12 * Developed by Simple Network Magic Corporation (SNMC) 13 * Copyright (C) 1996 by Erik Stahlman (ES) 14 * 15 * Information contained in this file was obtained from the LAN91C96 16 * manual from SMC. To get a copy, if you really want one, you can find 17 * information under www.smsc.com. 18 * 19 * "Features" of the SMC chip: 20 * 6144 byte packet memory. ( for the 91C96 ) 21 * EEPROM for configuration 22 * AUI/TP selection ( mine has 10Base2/10BaseT select ) 23 * 24 * Arguments: 25 * io = for the base address 26 * irq = for the IRQ 27 * 28 * author: 29 * Erik Stahlman ( erik (at) vt.edu ) 30 * Daris A Nevil ( dnevil (at) snmc.com ) 31 * 32 * 33 * Hardware multicast code from Peter Cammaert ( pc (at) denkart.be ) 34 * 35 * Sources: 36 * o SMSC LAN91C96 databook (www.smsc.com) 37 * o smc91111.c (u-boot driver) 38 * o smc9194.c (linux kernel driver) 39 * o lan91c96.c (Intel Diagnostic Manager driver) 40 * 41 * History: 42 * 04/30/03 Mathijs Haarman Modified smc91111.c (u-boot version) 43 * for lan91c96 44 *--------------------------------------------------------------------------- 45 */ 46 47 #include <common.h> 48 #include <command.h> 49 #include <malloc.h> 50 #include "lan91c96.h" 51 #include <net.h> 52 #include <linux/compiler.h> 53 54 /*------------------------------------------------------------------------ 55 * 56 * Configuration options, for the experienced user to change. 57 * 58 -------------------------------------------------------------------------*/ 59 60 /* Use power-down feature of the chip */ 61 #define POWER_DOWN 0 62 63 /* 64 * Wait time for memory to be free. This probably shouldn't be 65 * tuned that much, as waiting for this means nothing else happens 66 * in the system 67 */ 68 #define MEMORY_WAIT_TIME 16 69 70 #define SMC_DEBUG 0 71 72 #if (SMC_DEBUG > 2 ) 73 #define PRINTK3(args...) printf(args) 74 #else 75 #define PRINTK3(args...) 76 #endif 77 78 #if SMC_DEBUG > 1 79 #define PRINTK2(args...) printf(args) 80 #else 81 #define PRINTK2(args...) 82 #endif 83 84 #ifdef SMC_DEBUG 85 #define PRINTK(args...) printf(args) 86 #else 87 #define PRINTK(args...) 88 #endif 89 90 91 /*------------------------------------------------------------------------ 92 * 93 * The internal workings of the driver. If you are changing anything 94 * here with the SMC stuff, you should have the datasheet and know 95 * what you are doing. 96 * 97 *------------------------------------------------------------------------ 98 */ 99 #define DRIVER_NAME "LAN91C96" 100 #define SMC_ALLOC_MAX_TRY 5 101 #define SMC_TX_TIMEOUT 30 102 103 #define ETH_ZLEN 60 104 105 #ifdef CONFIG_LAN91C96_USE_32_BIT 106 #define USE_32_BIT 1 107 #else 108 #undef USE_32_BIT 109 #endif 110 111 /* See if a MAC address is defined in the current environment. If so use it. If not 112 . print a warning and set the environment and other globals with the default. 113 . If an EEPROM is present it really should be consulted. 114 */ 115 static int smc_get_ethaddr(bd_t *bd, struct eth_device *dev); 116 static int get_rom_mac(struct eth_device *dev, unsigned char *v_rom_mac); 117 118 /* ------------------------------------------------------------ 119 * Internal routines 120 * ------------------------------------------------------------ 121 */ 122 123 static unsigned char smc_mac_addr[] = { 0xc0, 0x00, 0x00, 0x1b, 0x62, 0x9c }; 124 125 /* 126 * This function must be called before smc_open() if you want to override 127 * the default mac address. 128 */ 129 130 static void smc_set_mac_addr(const unsigned char *addr) 131 { 132 int i; 133 134 for (i = 0; i < sizeof (smc_mac_addr); i++) { 135 smc_mac_addr[i] = addr[i]; 136 } 137 } 138 139 /*********************************************** 140 * Show available memory * 141 ***********************************************/ 142 void dump_memory_info(struct eth_device *dev) 143 { 144 __maybe_unused word mem_info; 145 word old_bank; 146 147 old_bank = SMC_inw(dev, LAN91C96_BANK_SELECT) & 0xF; 148 149 SMC_SELECT_BANK(dev, 0); 150 mem_info = SMC_inw(dev, LAN91C96_MIR); 151 PRINTK2 ("Memory: %4d available\n", (mem_info >> 8) * 2048); 152 153 SMC_SELECT_BANK(dev, old_bank); 154 } 155 156 /* 157 * A rather simple routine to print out a packet for debugging purposes. 158 */ 159 #if SMC_DEBUG > 2 160 static void print_packet (byte *, int); 161 #endif 162 163 static int poll4int (struct eth_device *dev, byte mask, int timeout) 164 { 165 int tmo = get_timer (0) + timeout * CONFIG_SYS_HZ; 166 int is_timeout = 0; 167 word old_bank = SMC_inw(dev, LAN91C96_BANK_SELECT); 168 169 PRINTK2 ("Polling...\n"); 170 SMC_SELECT_BANK(dev, 2); 171 while ((SMC_inw(dev, LAN91C96_INT_STATS) & mask) == 0) { 172 if (get_timer (0) >= tmo) { 173 is_timeout = 1; 174 break; 175 } 176 } 177 178 /* restore old bank selection */ 179 SMC_SELECT_BANK(dev, old_bank); 180 181 if (is_timeout) 182 return 1; 183 else 184 return 0; 185 } 186 187 /* 188 * Function: smc_reset 189 * Purpose: 190 * This sets the SMC91111 chip to its normal state, hopefully from whatever 191 * mess that any other DOS driver has put it in. 192 * 193 * Maybe I should reset more registers to defaults in here? SOFTRST should 194 * do that for me. 195 * 196 * Method: 197 * 1. send a SOFT RESET 198 * 2. wait for it to finish 199 * 3. enable autorelease mode 200 * 4. reset the memory management unit 201 * 5. clear all interrupts 202 * 203 */ 204 static void smc_reset(struct eth_device *dev) 205 { 206 PRINTK2("%s:smc_reset\n", dev->name); 207 208 /* This resets the registers mostly to defaults, but doesn't 209 affect EEPROM. That seems unnecessary */ 210 SMC_SELECT_BANK(dev, 0); 211 SMC_outw(dev, LAN91C96_RCR_SOFT_RST, LAN91C96_RCR); 212 213 udelay (10); 214 215 /* Disable transmit and receive functionality */ 216 SMC_outw(dev, 0, LAN91C96_RCR); 217 SMC_outw(dev, 0, LAN91C96_TCR); 218 219 /* set the control register */ 220 SMC_SELECT_BANK(dev, 1); 221 SMC_outw(dev, SMC_inw(dev, LAN91C96_CONTROL) | LAN91C96_CTR_BIT_8, 222 LAN91C96_CONTROL); 223 224 /* Disable all interrupts */ 225 SMC_outb(dev, 0, LAN91C96_INT_MASK); 226 } 227 228 /* 229 * Function: smc_enable 230 * Purpose: let the chip talk to the outside work 231 * Method: 232 * 1. Initialize the Memory Configuration Register 233 * 2. Enable the transmitter 234 * 3. Enable the receiver 235 */ 236 static void smc_enable(struct eth_device *dev) 237 { 238 PRINTK2("%s:smc_enable\n", dev->name); 239 SMC_SELECT_BANK(dev, 0); 240 241 /* Initialize the Memory Configuration Register. See page 242 49 of the LAN91C96 data sheet for details. */ 243 SMC_outw(dev, LAN91C96_MCR_TRANSMIT_PAGES, LAN91C96_MCR); 244 245 /* Initialize the Transmit Control Register */ 246 SMC_outw(dev, LAN91C96_TCR_TXENA, LAN91C96_TCR); 247 /* Initialize the Receive Control Register 248 * FIXME: 249 * The promiscuous bit set because I could not receive ARP reply 250 * packets from the server when I send a ARP request. It only works 251 * when I set the promiscuous bit 252 */ 253 SMC_outw(dev, LAN91C96_RCR_RXEN | LAN91C96_RCR_PRMS, LAN91C96_RCR); 254 } 255 256 /* 257 * Function: smc_shutdown 258 * Purpose: closes down the SMC91xxx chip. 259 * Method: 260 * 1. zero the interrupt mask 261 * 2. clear the enable receive flag 262 * 3. clear the enable xmit flags 263 * 264 * TODO: 265 * (1) maybe utilize power down mode. 266 * Why not yet? Because while the chip will go into power down mode, 267 * the manual says that it will wake up in response to any I/O requests 268 * in the register space. Empirical results do not show this working. 269 */ 270 static void smc_shutdown(struct eth_device *dev) 271 { 272 PRINTK2("%s:smc_shutdown\n", dev->name); 273 274 /* no more interrupts for me */ 275 SMC_SELECT_BANK(dev, 2); 276 SMC_outb(dev, 0, LAN91C96_INT_MASK); 277 278 /* and tell the card to stay away from that nasty outside world */ 279 SMC_SELECT_BANK(dev, 0); 280 SMC_outb(dev, 0, LAN91C96_RCR); 281 SMC_outb(dev, 0, LAN91C96_TCR); 282 } 283 284 285 /* 286 * Function: smc_hardware_send_packet(struct net_device * ) 287 * Purpose: 288 * This sends the actual packet to the SMC9xxx chip. 289 * 290 * Algorithm: 291 * First, see if a saved_skb is available. 292 * ( this should NOT be called if there is no 'saved_skb' 293 * Now, find the packet number that the chip allocated 294 * Point the data pointers at it in memory 295 * Set the length word in the chip's memory 296 * Dump the packet to chip memory 297 * Check if a last byte is needed ( odd length packet ) 298 * if so, set the control flag right 299 * Tell the card to send it 300 * Enable the transmit interrupt, so I know if it failed 301 * Free the kernel data if I actually sent it. 302 */ 303 static int smc_send_packet(struct eth_device *dev, void *packet, 304 int packet_length) 305 { 306 byte packet_no; 307 byte *buf; 308 int length; 309 int numPages; 310 int try = 0; 311 int time_out; 312 byte status; 313 314 315 PRINTK3("%s:smc_hardware_send_packet\n", dev->name); 316 317 length = ETH_ZLEN < packet_length ? packet_length : ETH_ZLEN; 318 319 /* allocate memory 320 ** The MMU wants the number of pages to be the number of 256 bytes 321 ** 'pages', minus 1 ( since a packet can't ever have 0 pages :) ) 322 ** 323 ** The 91C111 ignores the size bits, but the code is left intact 324 ** for backwards and future compatibility. 325 ** 326 ** Pkt size for allocating is data length +6 (for additional status 327 ** words, length and ctl!) 328 ** 329 ** If odd size then last byte is included in this header. 330 */ 331 numPages = ((length & 0xfffe) + 6); 332 numPages >>= 8; /* Divide by 256 */ 333 334 if (numPages > 7) { 335 printf("%s: Far too big packet error. \n", dev->name); 336 return 0; 337 } 338 339 /* now, try to allocate the memory */ 340 341 SMC_SELECT_BANK(dev, 2); 342 SMC_outw(dev, LAN91C96_MMUCR_ALLOC_TX | numPages, LAN91C96_MMU); 343 344 again: 345 try++; 346 time_out = MEMORY_WAIT_TIME; 347 do { 348 status = SMC_inb(dev, LAN91C96_INT_STATS); 349 if (status & LAN91C96_IST_ALLOC_INT) { 350 351 SMC_outb(dev, LAN91C96_IST_ALLOC_INT, 352 LAN91C96_INT_STATS); 353 break; 354 } 355 } while (--time_out); 356 357 if (!time_out) { 358 PRINTK2 ("%s: memory allocation, try %d failed ...\n", 359 dev->name, try); 360 if (try < SMC_ALLOC_MAX_TRY) 361 goto again; 362 else 363 return 0; 364 } 365 366 PRINTK2 ("%s: memory allocation, try %d succeeded ...\n", 367 dev->name, try); 368 369 /* I can send the packet now.. */ 370 buf = (byte *) packet; 371 372 /* If I get here, I _know_ there is a packet slot waiting for me */ 373 packet_no = SMC_inb(dev, LAN91C96_ARR); 374 if (packet_no & LAN91C96_ARR_FAILED) { 375 /* or isn't there? BAD CHIP! */ 376 printf("%s: Memory allocation failed. \n", dev->name); 377 return 0; 378 } 379 380 /* we have a packet address, so tell the card to use it */ 381 SMC_outb(dev, packet_no, LAN91C96_PNR); 382 383 /* point to the beginning of the packet */ 384 SMC_outw(dev, LAN91C96_PTR_AUTO_INCR, LAN91C96_POINTER); 385 386 PRINTK3("%s: Trying to xmit packet of length %x\n", 387 dev->name, length); 388 389 #if SMC_DEBUG > 2 390 printf ("Transmitting Packet\n"); 391 print_packet (buf, length); 392 #endif 393 394 /* send the packet length ( +6 for status, length and ctl byte ) 395 and the status word ( set to zeros ) */ 396 #ifdef USE_32_BIT 397 SMC_outl(dev, (length + 6) << 16, LAN91C96_DATA_HIGH); 398 #else 399 SMC_outw(dev, 0, LAN91C96_DATA_HIGH); 400 /* send the packet length ( +6 for status words, length, and ctl */ 401 SMC_outw(dev, (length + 6), LAN91C96_DATA_HIGH); 402 #endif /* USE_32_BIT */ 403 404 /* send the actual data 405 * I _think_ it's faster to send the longs first, and then 406 * mop up by sending the last word. It depends heavily 407 * on alignment, at least on the 486. Maybe it would be 408 * a good idea to check which is optimal? But that could take 409 * almost as much time as is saved? 410 */ 411 #ifdef USE_32_BIT 412 SMC_outsl(dev, LAN91C96_DATA_HIGH, buf, length >> 2); 413 if (length & 0x2) 414 SMC_outw(dev, *((word *) (buf + (length & 0xFFFFFFFC))), 415 LAN91C96_DATA_HIGH); 416 #else 417 SMC_outsw(dev, LAN91C96_DATA_HIGH, buf, (length) >> 1); 418 #endif /* USE_32_BIT */ 419 420 /* Send the last byte, if there is one. */ 421 if ((length & 1) == 0) { 422 SMC_outw(dev, 0, LAN91C96_DATA_HIGH); 423 } else { 424 SMC_outw(dev, buf[length - 1] | 0x2000, LAN91C96_DATA_HIGH); 425 } 426 427 /* and let the chipset deal with it */ 428 SMC_outw(dev, LAN91C96_MMUCR_ENQUEUE, LAN91C96_MMU); 429 430 /* poll for TX INT */ 431 if (poll4int (dev, LAN91C96_MSK_TX_INT, SMC_TX_TIMEOUT)) { 432 /* sending failed */ 433 PRINTK2("%s: TX timeout, sending failed...\n", dev->name); 434 435 /* release packet */ 436 SMC_outw(dev, LAN91C96_MMUCR_RELEASE_TX, LAN91C96_MMU); 437 438 /* wait for MMU getting ready (low) */ 439 while (SMC_inw(dev, LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY) 440 udelay (10); 441 442 PRINTK2("MMU ready\n"); 443 444 445 return 0; 446 } else { 447 /* ack. int */ 448 SMC_outw(dev, LAN91C96_IST_TX_INT, LAN91C96_INT_STATS); 449 450 PRINTK2("%s: Sent packet of length %d \n", dev->name, length); 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 length; 463 } 464 465 466 /* 467 * Open and Initialize the board 468 * 469 * Set up everything, reset the card, etc .. 470 * 471 */ 472 static int smc_open(bd_t *bd, struct eth_device *dev) 473 { 474 int i, err; /* used to set hw ethernet address */ 475 476 PRINTK2("%s:smc_open\n", dev->name); 477 478 /* reset the hardware */ 479 480 smc_reset(dev); 481 smc_enable(dev); 482 483 SMC_SELECT_BANK(dev, 1); 484 /* set smc_mac_addr, and sync it with u-boot globals */ 485 err = smc_get_ethaddr(bd, dev); 486 if (err < 0) 487 return -1; 488 #ifdef USE_32_BIT 489 for (i = 0; i < 6; i += 2) { 490 word address; 491 492 address = smc_mac_addr[i + 1] << 8; 493 address |= smc_mac_addr[i]; 494 SMC_outw(dev, address, LAN91C96_IA0 + i); 495 } 496 #else 497 for (i = 0; i < 6; i++) 498 SMC_outb(dev, smc_mac_addr[i], LAN91C96_IA0 + i); 499 #endif 500 return 0; 501 } 502 503 /*------------------------------------------------------------- 504 * 505 * smc_rcv - receive a packet from the card 506 * 507 * There is ( at least ) a packet waiting to be read from 508 * chip-memory. 509 * 510 * o Read the status 511 * o If an error, record it 512 * o otherwise, read in the packet 513 *------------------------------------------------------------- 514 */ 515 static int smc_rcv(struct eth_device *dev) 516 { 517 int packet_number; 518 word status; 519 word packet_length; 520 int is_error = 0; 521 522 #ifdef USE_32_BIT 523 dword stat_len; 524 #endif 525 526 527 SMC_SELECT_BANK(dev, 2); 528 packet_number = SMC_inw(dev, LAN91C96_FIFO); 529 530 if (packet_number & LAN91C96_FIFO_RXEMPTY) { 531 return 0; 532 } 533 534 PRINTK3("%s:smc_rcv\n", dev->name); 535 /* start reading from the start of the packet */ 536 SMC_outw(dev, LAN91C96_PTR_READ | LAN91C96_PTR_RCV | 537 LAN91C96_PTR_AUTO_INCR, LAN91C96_POINTER); 538 539 /* First two words are status and packet_length */ 540 #ifdef USE_32_BIT 541 stat_len = SMC_inl(dev, LAN91C96_DATA_HIGH); 542 status = stat_len & 0xffff; 543 packet_length = stat_len >> 16; 544 #else 545 status = SMC_inw(dev, LAN91C96_DATA_HIGH); 546 packet_length = SMC_inw(dev, LAN91C96_DATA_HIGH); 547 #endif 548 549 packet_length &= 0x07ff; /* mask off top bits */ 550 551 PRINTK2 ("RCV: STATUS %4x LENGTH %4x\n", status, packet_length); 552 553 if (!(status & FRAME_FILTER)) { 554 /* Adjust for having already read the first two words */ 555 packet_length -= 4; /*4; */ 556 557 558 /* set odd length for bug in LAN91C111, */ 559 /* which never sets RS_ODDFRAME */ 560 /* TODO ? */ 561 562 563 #ifdef USE_32_BIT 564 PRINTK3 (" Reading %d dwords (and %d bytes) \n", 565 packet_length >> 2, packet_length & 3); 566 /* QUESTION: Like in the TX routine, do I want 567 to send the DWORDs or the bytes first, or some 568 mixture. A mixture might improve already slow PIO 569 performance */ 570 SMC_insl(dev, LAN91C96_DATA_HIGH, net_rx_packets[0], 571 packet_length >> 2); 572 /* read the left over bytes */ 573 if (packet_length & 3) { 574 int i; 575 576 byte *tail = (byte *)(net_rx_packets[0] + 577 (packet_length & ~3)); 578 dword leftover = SMC_inl(dev, LAN91C96_DATA_HIGH); 579 580 for (i = 0; i < (packet_length & 3); i++) 581 *tail++ = (byte) (leftover >> (8 * i)) & 0xff; 582 } 583 #else 584 PRINTK3(" Reading %d words and %d byte(s)\n", 585 (packet_length >> 1), packet_length & 1); 586 SMC_insw(dev, LAN91C96_DATA_HIGH, net_rx_packets[0], 587 packet_length >> 1); 588 589 #endif /* USE_32_BIT */ 590 591 #if SMC_DEBUG > 2 592 printf ("Receiving Packet\n"); 593 print_packet((byte *)net_rx_packets[0], packet_length); 594 #endif 595 } else { 596 /* error ... */ 597 /* TODO ? */ 598 is_error = 1; 599 } 600 601 while (SMC_inw(dev, LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY) 602 udelay (1); /* Wait until not busy */ 603 604 /* error or good, tell the card to get rid of this packet */ 605 SMC_outw(dev, LAN91C96_MMUCR_RELEASE_RX, LAN91C96_MMU); 606 607 while (SMC_inw(dev, LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY) 608 udelay (1); /* Wait until not busy */ 609 610 if (!is_error) { 611 /* Pass the packet up to the protocol layers. */ 612 net_process_received_packet(net_rx_packets[0], packet_length); 613 return packet_length; 614 } else { 615 return 0; 616 } 617 618 } 619 620 /*---------------------------------------------------- 621 * smc_close 622 * 623 * this makes the board clean up everything that it can 624 * and not talk to the outside world. Caused by 625 * an 'ifconfig ethX down' 626 * 627 -----------------------------------------------------*/ 628 static int smc_close(struct eth_device *dev) 629 { 630 PRINTK2("%s:smc_close\n", dev->name); 631 632 /* clear everything */ 633 smc_shutdown(dev); 634 635 return 0; 636 } 637 638 #if SMC_DEBUG > 2 639 static void print_packet(byte *buf, int length) 640 { 641 #if 0 642 int i; 643 int remainder; 644 int lines; 645 646 printf ("Packet of length %d \n", length); 647 648 lines = length / 16; 649 remainder = length % 16; 650 651 for (i = 0; i < lines; i++) { 652 int cur; 653 654 for (cur = 0; cur < 8; cur++) { 655 byte a, b; 656 657 a = *(buf++); 658 b = *(buf++); 659 printf ("%02x%02x ", a, b); 660 } 661 printf ("\n"); 662 } 663 for (i = 0; i < remainder / 2; i++) { 664 byte a, b; 665 666 a = *(buf++); 667 b = *(buf++); 668 printf ("%02x%02x ", a, b); 669 } 670 printf ("\n"); 671 #endif /* 0 */ 672 } 673 #endif /* SMC_DEBUG > 2 */ 674 675 static int lan91c96_init(struct eth_device *dev, bd_t *bd) 676 { 677 return smc_open(bd, dev); 678 } 679 680 static void lan91c96_halt(struct eth_device *dev) 681 { 682 smc_close(dev); 683 } 684 685 static int lan91c96_recv(struct eth_device *dev) 686 { 687 return smc_rcv(dev); 688 } 689 690 static int lan91c96_send(struct eth_device *dev, void *packet, 691 int length) 692 { 693 return smc_send_packet(dev, packet, length); 694 } 695 696 /* smc_get_ethaddr 697 * 698 * This checks both the environment and the ROM for an ethernet address. If 699 * found, the environment takes precedence. 700 */ 701 702 static int smc_get_ethaddr(bd_t *bd, struct eth_device *dev) 703 { 704 uchar v_mac[6]; 705 706 if (!eth_env_get_enetaddr("ethaddr", v_mac)) { 707 /* get ROM mac value if any */ 708 if (!get_rom_mac(dev, v_mac)) { 709 printf("\n*** ERROR: ethaddr is NOT set !!\n"); 710 return -1; 711 } 712 eth_env_set_enetaddr("ethaddr", v_mac); 713 } 714 715 smc_set_mac_addr(v_mac); /* use old function to update smc default */ 716 PRINTK("Using MAC Address %pM\n", v_mac); 717 return 0; 718 } 719 720 /* 721 * get_rom_mac() 722 * Note, this has omly been tested for the OMAP730 P2. 723 */ 724 725 static int get_rom_mac(struct eth_device *dev, unsigned char *v_rom_mac) 726 { 727 int i; 728 SMC_SELECT_BANK(dev, 1); 729 for (i=0; i<6; i++) 730 { 731 v_rom_mac[i] = SMC_inb(dev, LAN91C96_IA0 + i); 732 } 733 return (1); 734 } 735 736 /* Structure to detect the device IDs */ 737 struct id_type { 738 u8 id; 739 char *name; 740 }; 741 static struct id_type supported_chips[] = { 742 {0, ""}, /* Dummy entry to prevent id check failure */ 743 {9, "LAN91C110"}, 744 {8, "LAN91C100FD"}, 745 {7, "LAN91C100"}, 746 {5, "LAN91C95"}, 747 {4, "LAN91C94/96"}, 748 {3, "LAN91C90/92"}, 749 }; 750 /* lan91c96_detect_chip 751 * See: 752 * http://www.embeddedsys.com/subpages/resources/images/documents/LAN91C96_datasheet.pdf 753 * page 71 - that is the closest we get to detect this device 754 */ 755 static int lan91c96_detect_chip(struct eth_device *dev) 756 { 757 u8 chip_id; 758 int r; 759 SMC_SELECT_BANK(dev, 3); 760 chip_id = (SMC_inw(dev, 0xA) & LAN91C96_REV_CHIPID) >> 4; 761 SMC_SELECT_BANK(dev, 0); 762 for (r = 0; r < ARRAY_SIZE(supported_chips); r++) 763 if (chip_id == supported_chips[r].id) 764 return r; 765 return 0; 766 } 767 768 int lan91c96_initialize(u8 dev_num, int base_addr) 769 { 770 struct eth_device *dev; 771 int r = 0; 772 773 dev = malloc(sizeof(*dev)); 774 if (!dev) { 775 return 0; 776 } 777 memset(dev, 0, sizeof(*dev)); 778 779 dev->iobase = base_addr; 780 781 /* Try to detect chip. Will fail if not present. */ 782 r = lan91c96_detect_chip(dev); 783 if (!r) { 784 free(dev); 785 return 0; 786 } 787 get_rom_mac(dev, dev->enetaddr); 788 789 dev->init = lan91c96_init; 790 dev->halt = lan91c96_halt; 791 dev->send = lan91c96_send; 792 dev->recv = lan91c96_recv; 793 sprintf(dev->name, "%s-%hu", supported_chips[r].name, dev_num); 794 795 eth_register(dev); 796 return 0; 797 } 798
