1 /* 2 Ported to U-Boot by Christian Pellegrin <chri@ascensit.com> 3 4 Based on sources from the Linux kernel (pcnet_cs.c, 8390.h) and 5 eCOS(if_dp83902a.c, if_dp83902a.h). Both of these 2 wonderful world 6 are GPL, so this is, of course, GPL. 7 8 ========================================================================== 9 10 dev/if_dp83902a.c 11 12 Ethernet device driver for NS DP83902a ethernet controller 13 14 ========================================================================== 15 ####ECOSGPLCOPYRIGHTBEGIN#### 16 ------------------------------------------- 17 This file is part of eCos, the Embedded Configurable Operating System. 18 Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. 19 20 eCos is free software; you can redistribute it and/or modify it under 21 the terms of the GNU General Public License as published by the Free 22 Software Foundation; either version 2 or (at your option) any later version. 23 24 eCos is distributed in the hope that it will be useful, but WITHOUT ANY 25 WARRANTY; without even the implied warranty of MERCHANTABILITY or 26 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 27 for more details. 28 29 You should have received a copy of the GNU General Public License along 30 with eCos; if not, write to the Free Software Foundation, Inc., 31 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 32 33 As a special exception, if other files instantiate templates or use macros 34 or inline functions from this file, or you compile this file and link it 35 with other works to produce a work based on this file, this file does not 36 by itself cause the resulting work to be covered by the GNU General Public 37 License. However the source code for this file must still be made available 38 in accordance with section (3) of the GNU General Public License. 39 40 This exception does not invalidate any other reasons why a work based on 41 this file might be covered by the GNU General Public License. 42 43 Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. 44 at http://sources.redhat.com/ecos/ecos-license/ 45 ------------------------------------------- 46 ####ECOSGPLCOPYRIGHTEND#### 47 ####BSDCOPYRIGHTBEGIN#### 48 49 ------------------------------------------- 50 51 Portions of this software may have been derived from OpenBSD or other sources, 52 and are covered by the appropriate copyright disclaimers included herein. 53 54 ------------------------------------------- 55 56 ####BSDCOPYRIGHTEND#### 57 ========================================================================== 58 #####DESCRIPTIONBEGIN#### 59 60 Author(s): gthomas 61 Contributors: gthomas, jskov, rsandifo 62 Date: 2001-06-13 63 Purpose: 64 Description: 65 66 FIXME: Will fail if pinged with large packets (1520 bytes) 67 Add promisc config 68 Add SNMP 69 70 ####DESCRIPTIONEND#### 71 72 ========================================================================== 73 */ 74 75 #include <common.h> 76 #include <command.h> 77 #include <net.h> 78 #include <malloc.h> 79 #include <linux/compiler.h> 80 81 /* forward definition of function used for the uboot interface */ 82 void uboot_push_packet_len(int len); 83 void uboot_push_tx_done(int key, int val); 84 85 /* NE2000 base header file */ 86 #include "ne2000_base.h" 87 88 #if defined(CONFIG_DRIVER_AX88796L) 89 /* AX88796L support */ 90 #include "ax88796.h" 91 #else 92 /* Basic NE2000 chip support */ 93 #include "ne2000.h" 94 #endif 95 96 static dp83902a_priv_data_t nic; /* just one instance of the card supported */ 97 98 /** 99 * This function reads the MAC address from the serial EEPROM, 100 * used if PROM read fails. Does nothing for ax88796 chips (sh boards) 101 */ 102 static bool 103 dp83902a_init(unsigned char *enetaddr) 104 { 105 dp83902a_priv_data_t *dp = &nic; 106 u8* base; 107 #if defined(NE2000_BASIC_INIT) 108 int i; 109 #endif 110 111 DEBUG_FUNCTION(); 112 113 base = dp->base; 114 if (!base) 115 return false; /* No device found */ 116 117 DEBUG_LINE(); 118 119 #if defined(NE2000_BASIC_INIT) 120 /* AX88796L doesn't need */ 121 /* Prepare ESA */ 122 DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_PAGE1); /* Select page 1 */ 123 /* Use the address from the serial EEPROM */ 124 for (i = 0; i < 6; i++) 125 DP_IN(base, DP_P1_PAR0+i, dp->esa[i]); 126 DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_PAGE0); /* Select page 0 */ 127 128 printf("NE2000 - %s ESA: %02x:%02x:%02x:%02x:%02x:%02x\n", 129 "eeprom", 130 dp->esa[0], 131 dp->esa[1], 132 dp->esa[2], 133 dp->esa[3], 134 dp->esa[4], 135 dp->esa[5] ); 136 137 memcpy(enetaddr, dp->esa, 6); /* Use MAC from serial EEPROM */ 138 #endif /* NE2000_BASIC_INIT */ 139 return true; 140 } 141 142 static void 143 dp83902a_stop(void) 144 { 145 dp83902a_priv_data_t *dp = &nic; 146 u8 *base = dp->base; 147 148 DEBUG_FUNCTION(); 149 150 DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_STOP); /* Brutal */ 151 DP_OUT(base, DP_ISR, 0xFF); /* Clear any pending interrupts */ 152 DP_OUT(base, DP_IMR, 0x00); /* Disable all interrupts */ 153 154 dp->running = false; 155 } 156 157 /* 158 * This function is called to "start up" the interface. It may be called 159 * multiple times, even when the hardware is already running. It will be 160 * called whenever something "hardware oriented" changes and should leave 161 * the hardware ready to send/receive packets. 162 */ 163 static void 164 dp83902a_start(u8 * enaddr) 165 { 166 dp83902a_priv_data_t *dp = &nic; 167 u8 *base = dp->base; 168 int i; 169 170 debug("The MAC is %pM\n", enaddr); 171 172 DEBUG_FUNCTION(); 173 174 DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_STOP); /* Brutal */ 175 DP_OUT(base, DP_DCR, DP_DCR_INIT); 176 DP_OUT(base, DP_RBCH, 0); /* Remote byte count */ 177 DP_OUT(base, DP_RBCL, 0); 178 DP_OUT(base, DP_RCR, DP_RCR_MON); /* Accept no packets */ 179 DP_OUT(base, DP_TCR, DP_TCR_LOCAL); /* Transmitter [virtually] off */ 180 DP_OUT(base, DP_TPSR, dp->tx_buf1); /* Transmitter start page */ 181 dp->tx1 = dp->tx2 = 0; 182 dp->tx_next = dp->tx_buf1; 183 dp->tx_started = false; 184 dp->running = true; 185 DP_OUT(base, DP_PSTART, dp->rx_buf_start); /* Receive ring start page */ 186 DP_OUT(base, DP_BNDRY, dp->rx_buf_end - 1); /* Receive ring boundary */ 187 DP_OUT(base, DP_PSTOP, dp->rx_buf_end); /* Receive ring end page */ 188 dp->rx_next = dp->rx_buf_start - 1; 189 dp->running = true; 190 DP_OUT(base, DP_ISR, 0xFF); /* Clear any pending interrupts */ 191 DP_OUT(base, DP_IMR, DP_IMR_All); /* Enable all interrupts */ 192 DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_PAGE1 | DP_CR_STOP); /* Select page 1 */ 193 DP_OUT(base, DP_P1_CURP, dp->rx_buf_start); /* Current page - next free page for Rx */ 194 dp->running = true; 195 for (i = 0; i < ETHER_ADDR_LEN; i++) { 196 /* FIXME */ 197 /*((vu_short*)( base + ((DP_P1_PAR0 + i) * 2) + 198 * 0x1400)) = enaddr[i];*/ 199 DP_OUT(base, DP_P1_PAR0+i, enaddr[i]); 200 } 201 /* Enable and start device */ 202 DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START); 203 DP_OUT(base, DP_TCR, DP_TCR_NORMAL); /* Normal transmit operations */ 204 DP_OUT(base, DP_RCR, DP_RCR_AB); /* Accept broadcast, no errors, no multicast */ 205 dp->running = true; 206 } 207 208 /* 209 * This routine is called to start the transmitter. It is split out from the 210 * data handling routine so it may be called either when data becomes first 211 * available or when an Tx interrupt occurs 212 */ 213 214 static void 215 dp83902a_start_xmit(int start_page, int len) 216 { 217 dp83902a_priv_data_t *dp = (dp83902a_priv_data_t *) &nic; 218 u8 *base = dp->base; 219 220 DEBUG_FUNCTION(); 221 222 #if DEBUG & 1 223 printf("Tx pkt %d len %d\n", start_page, len); 224 if (dp->tx_started) 225 printf("TX already started?!?\n"); 226 #endif 227 228 DP_OUT(base, DP_ISR, (DP_ISR_TxP | DP_ISR_TxE)); 229 DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START); 230 DP_OUT(base, DP_TBCL, len & 0xFF); 231 DP_OUT(base, DP_TBCH, len >> 8); 232 DP_OUT(base, DP_TPSR, start_page); 233 DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_TXPKT | DP_CR_START); 234 235 dp->tx_started = true; 236 } 237 238 /* 239 * This routine is called to send data to the hardware. It is known a-priori 240 * that there is free buffer space (dp->tx_next). 241 */ 242 static void 243 dp83902a_send(u8 *data, int total_len, u32 key) 244 { 245 struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic; 246 u8 *base = dp->base; 247 int len, start_page, pkt_len, i, isr; 248 #if DEBUG & 4 249 int dx; 250 #endif 251 252 DEBUG_FUNCTION(); 253 254 len = pkt_len = total_len; 255 if (pkt_len < IEEE_8023_MIN_FRAME) 256 pkt_len = IEEE_8023_MIN_FRAME; 257 258 start_page = dp->tx_next; 259 if (dp->tx_next == dp->tx_buf1) { 260 dp->tx1 = start_page; 261 dp->tx1_len = pkt_len; 262 dp->tx1_key = key; 263 dp->tx_next = dp->tx_buf2; 264 } else { 265 dp->tx2 = start_page; 266 dp->tx2_len = pkt_len; 267 dp->tx2_key = key; 268 dp->tx_next = dp->tx_buf1; 269 } 270 271 #if DEBUG & 5 272 printf("TX prep page %d len %d\n", start_page, pkt_len); 273 #endif 274 275 DP_OUT(base, DP_ISR, DP_ISR_RDC); /* Clear end of DMA */ 276 { 277 /* 278 * Dummy read. The manual sez something slightly different, 279 * but the code is extended a bit to do what Hitachi's monitor 280 * does (i.e., also read data). 281 */ 282 283 __maybe_unused u16 tmp; 284 int len = 1; 285 286 DP_OUT(base, DP_RSAL, 0x100 - len); 287 DP_OUT(base, DP_RSAH, (start_page - 1) & 0xff); 288 DP_OUT(base, DP_RBCL, len); 289 DP_OUT(base, DP_RBCH, 0); 290 DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_RDMA | DP_CR_START); 291 DP_IN_DATA(dp->data, tmp); 292 } 293 294 #ifdef CYGHWR_NS_DP83902A_PLF_BROKEN_TX_DMA 295 /* 296 * Stall for a bit before continuing to work around random data 297 * corruption problems on some platforms. 298 */ 299 CYGACC_CALL_IF_DELAY_US(1); 300 #endif 301 302 /* Send data to device buffer(s) */ 303 DP_OUT(base, DP_RSAL, 0); 304 DP_OUT(base, DP_RSAH, start_page); 305 DP_OUT(base, DP_RBCL, pkt_len & 0xFF); 306 DP_OUT(base, DP_RBCH, pkt_len >> 8); 307 DP_OUT(base, DP_CR, DP_CR_WDMA | DP_CR_START); 308 309 /* Put data into buffer */ 310 #if DEBUG & 4 311 printf(" sg buf %08lx len %08x\n ", (u32)data, len); 312 dx = 0; 313 #endif 314 while (len > 0) { 315 #if DEBUG & 4 316 printf(" %02x", *data); 317 if (0 == (++dx % 16)) printf("\n "); 318 #endif 319 320 DP_OUT_DATA(dp->data, *data++); 321 len--; 322 } 323 #if DEBUG & 4 324 printf("\n"); 325 #endif 326 if (total_len < pkt_len) { 327 #if DEBUG & 4 328 printf(" + %d bytes of padding\n", pkt_len - total_len); 329 #endif 330 /* Padding to 802.3 length was required */ 331 for (i = total_len; i < pkt_len;) { 332 i++; 333 DP_OUT_DATA(dp->data, 0); 334 } 335 } 336 337 #ifdef CYGHWR_NS_DP83902A_PLF_BROKEN_TX_DMA 338 /* 339 * After last data write, delay for a bit before accessing the 340 * device again, or we may get random data corruption in the last 341 * datum (on some platforms). 342 */ 343 CYGACC_CALL_IF_DELAY_US(1); 344 #endif 345 346 /* Wait for DMA to complete */ 347 do { 348 DP_IN(base, DP_ISR, isr); 349 } while ((isr & DP_ISR_RDC) == 0); 350 351 /* Then disable DMA */ 352 DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START); 353 354 /* Start transmit if not already going */ 355 if (!dp->tx_started) { 356 if (start_page == dp->tx1) { 357 dp->tx_int = 1; /* Expecting interrupt from BUF1 */ 358 } else { 359 dp->tx_int = 2; /* Expecting interrupt from BUF2 */ 360 } 361 dp83902a_start_xmit(start_page, pkt_len); 362 } 363 } 364 365 /* 366 * This function is called when a packet has been received. It's job is 367 * to prepare to unload the packet from the hardware. Once the length of 368 * the packet is known, the upper layer of the driver can be told. When 369 * the upper layer is ready to unload the packet, the internal function 370 * 'dp83902a_recv' will be called to actually fetch it from the hardware. 371 */ 372 static void 373 dp83902a_RxEvent(void) 374 { 375 struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic; 376 u8 *base = dp->base; 377 __maybe_unused u8 rsr; 378 u8 rcv_hdr[4]; 379 int i, len, pkt, cur; 380 381 DEBUG_FUNCTION(); 382 383 DP_IN(base, DP_RSR, rsr); 384 while (true) { 385 /* Read incoming packet header */ 386 DP_OUT(base, DP_CR, DP_CR_PAGE1 | DP_CR_NODMA | DP_CR_START); 387 DP_IN(base, DP_P1_CURP, cur); 388 DP_OUT(base, DP_P1_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START); 389 DP_IN(base, DP_BNDRY, pkt); 390 391 pkt += 1; 392 if (pkt == dp->rx_buf_end) 393 pkt = dp->rx_buf_start; 394 395 if (pkt == cur) { 396 break; 397 } 398 DP_OUT(base, DP_RBCL, sizeof(rcv_hdr)); 399 DP_OUT(base, DP_RBCH, 0); 400 DP_OUT(base, DP_RSAL, 0); 401 DP_OUT(base, DP_RSAH, pkt); 402 if (dp->rx_next == pkt) { 403 if (cur == dp->rx_buf_start) 404 DP_OUT(base, DP_BNDRY, dp->rx_buf_end - 1); 405 else 406 DP_OUT(base, DP_BNDRY, cur - 1); /* Update pointer */ 407 return; 408 } 409 dp->rx_next = pkt; 410 DP_OUT(base, DP_ISR, DP_ISR_RDC); /* Clear end of DMA */ 411 DP_OUT(base, DP_CR, DP_CR_RDMA | DP_CR_START); 412 #ifdef CYGHWR_NS_DP83902A_PLF_BROKEN_RX_DMA 413 CYGACC_CALL_IF_DELAY_US(10); 414 #endif 415 416 /* read header (get data size)*/ 417 for (i = 0; i < sizeof(rcv_hdr);) { 418 DP_IN_DATA(dp->data, rcv_hdr[i++]); 419 } 420 421 #if DEBUG & 5 422 printf("rx hdr %02x %02x %02x %02x\n", 423 rcv_hdr[0], rcv_hdr[1], rcv_hdr[2], rcv_hdr[3]); 424 #endif 425 len = ((rcv_hdr[3] << 8) | rcv_hdr[2]) - sizeof(rcv_hdr); 426 427 /* data read */ 428 uboot_push_packet_len(len); 429 430 if (rcv_hdr[1] == dp->rx_buf_start) 431 DP_OUT(base, DP_BNDRY, dp->rx_buf_end - 1); 432 else 433 DP_OUT(base, DP_BNDRY, rcv_hdr[1] - 1); /* Update pointer */ 434 } 435 } 436 437 /* 438 * This function is called as a result of the "eth_drv_recv()" call above. 439 * It's job is to actually fetch data for a packet from the hardware once 440 * memory buffers have been allocated for the packet. Note that the buffers 441 * may come in pieces, using a scatter-gather list. This allows for more 442 * efficient processing in the upper layers of the stack. 443 */ 444 static void 445 dp83902a_recv(u8 *data, int len) 446 { 447 struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic; 448 u8 *base = dp->base; 449 int i, mlen; 450 u8 saved_char = 0; 451 bool saved; 452 #if DEBUG & 4 453 int dx; 454 #endif 455 456 DEBUG_FUNCTION(); 457 458 #if DEBUG & 5 459 printf("Rx packet %d length %d\n", dp->rx_next, len); 460 #endif 461 462 /* Read incoming packet data */ 463 DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START); 464 DP_OUT(base, DP_RBCL, len & 0xFF); 465 DP_OUT(base, DP_RBCH, len >> 8); 466 DP_OUT(base, DP_RSAL, 4); /* Past header */ 467 DP_OUT(base, DP_RSAH, dp->rx_next); 468 DP_OUT(base, DP_ISR, DP_ISR_RDC); /* Clear end of DMA */ 469 DP_OUT(base, DP_CR, DP_CR_RDMA | DP_CR_START); 470 #ifdef CYGHWR_NS_DP83902A_PLF_BROKEN_RX_DMA 471 CYGACC_CALL_IF_DELAY_US(10); 472 #endif 473 474 saved = false; 475 for (i = 0; i < 1; i++) { 476 if (data) { 477 mlen = len; 478 #if DEBUG & 4 479 printf(" sg buf %08lx len %08x \n", (u32) data, mlen); 480 dx = 0; 481 #endif 482 while (0 < mlen) { 483 /* Saved byte from previous loop? */ 484 if (saved) { 485 *data++ = saved_char; 486 mlen--; 487 saved = false; 488 continue; 489 } 490 491 { 492 u8 tmp; 493 DP_IN_DATA(dp->data, tmp); 494 #if DEBUG & 4 495 printf(" %02x", tmp); 496 if (0 == (++dx % 16)) printf("\n "); 497 #endif 498 *data++ = tmp;; 499 mlen--; 500 } 501 } 502 #if DEBUG & 4 503 printf("\n"); 504 #endif 505 } 506 } 507 } 508 509 static void 510 dp83902a_TxEvent(void) 511 { 512 struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic; 513 u8 *base = dp->base; 514 __maybe_unused u8 tsr; 515 u32 key; 516 517 DEBUG_FUNCTION(); 518 519 DP_IN(base, DP_TSR, tsr); 520 if (dp->tx_int == 1) { 521 key = dp->tx1_key; 522 dp->tx1 = 0; 523 } else { 524 key = dp->tx2_key; 525 dp->tx2 = 0; 526 } 527 /* Start next packet if one is ready */ 528 dp->tx_started = false; 529 if (dp->tx1) { 530 dp83902a_start_xmit(dp->tx1, dp->tx1_len); 531 dp->tx_int = 1; 532 } else if (dp->tx2) { 533 dp83902a_start_xmit(dp->tx2, dp->tx2_len); 534 dp->tx_int = 2; 535 } else { 536 dp->tx_int = 0; 537 } 538 /* Tell higher level we sent this packet */ 539 uboot_push_tx_done(key, 0); 540 } 541 542 /* 543 * Read the tally counters to clear them. Called in response to a CNT 544 * interrupt. 545 */ 546 static void 547 dp83902a_ClearCounters(void) 548 { 549 struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic; 550 u8 *base = dp->base; 551 __maybe_unused u8 cnt1, cnt2, cnt3; 552 553 DP_IN(base, DP_FER, cnt1); 554 DP_IN(base, DP_CER, cnt2); 555 DP_IN(base, DP_MISSED, cnt3); 556 DP_OUT(base, DP_ISR, DP_ISR_CNT); 557 } 558 559 /* 560 * Deal with an overflow condition. This code follows the procedure set 561 * out in section 7.0 of the datasheet. 562 */ 563 static void 564 dp83902a_Overflow(void) 565 { 566 struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *)&nic; 567 u8 *base = dp->base; 568 u8 isr; 569 570 /* Issue a stop command and wait 1.6ms for it to complete. */ 571 DP_OUT(base, DP_CR, DP_CR_STOP | DP_CR_NODMA); 572 CYGACC_CALL_IF_DELAY_US(1600); 573 574 /* Clear the remote byte counter registers. */ 575 DP_OUT(base, DP_RBCL, 0); 576 DP_OUT(base, DP_RBCH, 0); 577 578 /* Enter loopback mode while we clear the buffer. */ 579 DP_OUT(base, DP_TCR, DP_TCR_LOCAL); 580 DP_OUT(base, DP_CR, DP_CR_START | DP_CR_NODMA); 581 582 /* 583 * Read in as many packets as we can and acknowledge any and receive 584 * interrupts. Since the buffer has overflowed, a receive event of 585 * some kind will have occured. 586 */ 587 dp83902a_RxEvent(); 588 DP_OUT(base, DP_ISR, DP_ISR_RxP|DP_ISR_RxE); 589 590 /* Clear the overflow condition and leave loopback mode. */ 591 DP_OUT(base, DP_ISR, DP_ISR_OFLW); 592 DP_OUT(base, DP_TCR, DP_TCR_NORMAL); 593 594 /* 595 * If a transmit command was issued, but no transmit event has occured, 596 * restart it here. 597 */ 598 DP_IN(base, DP_ISR, isr); 599 if (dp->tx_started && !(isr & (DP_ISR_TxP|DP_ISR_TxE))) { 600 DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_TXPKT | DP_CR_START); 601 } 602 } 603 604 static void 605 dp83902a_poll(void) 606 { 607 struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic; 608 u8 *base = dp->base; 609 u8 isr; 610 611 DP_OUT(base, DP_CR, DP_CR_NODMA | DP_CR_PAGE0 | DP_CR_START); 612 DP_IN(base, DP_ISR, isr); 613 while (0 != isr) { 614 /* 615 * The CNT interrupt triggers when the MSB of one of the error 616 * counters is set. We don't much care about these counters, but 617 * we should read their values to reset them. 618 */ 619 if (isr & DP_ISR_CNT) { 620 dp83902a_ClearCounters(); 621 } 622 /* 623 * Check for overflow. It's a special case, since there's a 624 * particular procedure that must be followed to get back into 625 * a running state.a 626 */ 627 if (isr & DP_ISR_OFLW) { 628 dp83902a_Overflow(); 629 } else { 630 /* 631 * Other kinds of interrupts can be acknowledged simply by 632 * clearing the relevant bits of the ISR. Do that now, then 633 * handle the interrupts we care about. 634 */ 635 DP_OUT(base, DP_ISR, isr); /* Clear set bits */ 636 if (!dp->running) break; /* Is this necessary? */ 637 /* 638 * Check for tx_started on TX event since these may happen 639 * spuriously it seems. 640 */ 641 if (isr & (DP_ISR_TxP|DP_ISR_TxE) && dp->tx_started) { 642 dp83902a_TxEvent(); 643 } 644 if (isr & (DP_ISR_RxP|DP_ISR_RxE)) { 645 dp83902a_RxEvent(); 646 } 647 } 648 DP_IN(base, DP_ISR, isr); 649 } 650 } 651 652 653 /* U-boot specific routines */ 654 static u8 *pbuf = NULL; 655 656 static int pkey = -1; 657 static int initialized = 0; 658 659 void uboot_push_packet_len(int len) { 660 PRINTK("pushed len = %d\n", len); 661 if (len >= 2000) { 662 printf("NE2000: packet too big\n"); 663 return; 664 } 665 dp83902a_recv(&pbuf[0], len); 666 667 /*Just pass it to the upper layer*/ 668 NetReceive(&pbuf[0], len); 669 } 670 671 void uboot_push_tx_done(int key, int val) { 672 PRINTK("pushed key = %d\n", key); 673 pkey = key; 674 } 675 676 /** 677 * Setup the driver and init MAC address according to doc/README.enetaddr 678 * Called by ne2k_register() before registering the driver @eth layer 679 * 680 * @param struct ethdevice of this instance of the driver for dev->enetaddr 681 * @return 0 on success, -1 on error (causing caller to print error msg) 682 */ 683 static int ne2k_setup_driver(struct eth_device *dev) 684 { 685 PRINTK("### ne2k_setup_driver\n"); 686 687 if (!pbuf) { 688 pbuf = malloc(2000); 689 if (!pbuf) { 690 printf("Cannot allocate rx buffer\n"); 691 return -1; 692 } 693 } 694 695 #ifdef CONFIG_DRIVER_NE2000_CCR 696 { 697 vu_char *p = (vu_char *) CONFIG_DRIVER_NE2000_CCR; 698 699 PRINTK("CCR before is %x\n", *p); 700 *p = CONFIG_DRIVER_NE2000_VAL; 701 PRINTK("CCR after is %x\n", *p); 702 } 703 #endif 704 705 nic.base = (u8 *) CONFIG_DRIVER_NE2000_BASE; 706 707 nic.data = nic.base + DP_DATA; 708 nic.tx_buf1 = START_PG; 709 nic.tx_buf2 = START_PG2; 710 nic.rx_buf_start = RX_START; 711 nic.rx_buf_end = RX_END; 712 713 /* 714 * According to doc/README.enetaddr, drivers shall give priority 715 * to the MAC address value in the environment, so we do not read 716 * it from the prom or eeprom if it is specified in the environment. 717 */ 718 if (!eth_getenv_enetaddr("ethaddr", dev->enetaddr)) { 719 /* If the MAC address is not in the environment, get it: */ 720 if (!get_prom(dev->enetaddr, nic.base)) /* get MAC from prom */ 721 dp83902a_init(dev->enetaddr); /* fallback: seeprom */ 722 /* And write it into the environment otherwise eth_write_hwaddr 723 * returns -1 due to eth_getenv_enetaddr_by_index() failing, 724 * and this causes "Warning: failed to set MAC address", and 725 * cmd_bdinfo has no ethaddr value which it can show: */ 726 eth_setenv_enetaddr("ethaddr", dev->enetaddr); 727 } 728 return 0; 729 } 730 731 static int ne2k_init(struct eth_device *dev, bd_t *bd) 732 { 733 dp83902a_start(dev->enetaddr); 734 initialized = 1; 735 return 0; 736 } 737 738 static void ne2k_halt(struct eth_device *dev) 739 { 740 debug("### ne2k_halt\n"); 741 if(initialized) 742 dp83902a_stop(); 743 initialized = 0; 744 } 745 746 static int ne2k_recv(struct eth_device *dev) 747 { 748 dp83902a_poll(); 749 return 1; 750 } 751 752 static int ne2k_send(struct eth_device *dev, void *packet, int length) 753 { 754 int tmo; 755 756 debug("### ne2k_send\n"); 757 758 pkey = -1; 759 760 dp83902a_send((u8 *) packet, length, 666); 761 tmo = get_timer (0) + TOUT * CONFIG_SYS_HZ; 762 while(1) { 763 dp83902a_poll(); 764 if (pkey != -1) { 765 PRINTK("Packet sucesfully sent\n"); 766 return 0; 767 } 768 if (get_timer (0) >= tmo) { 769 printf("transmission error (timoeut)\n"); 770 return 0; 771 } 772 773 } 774 return 0; 775 } 776 777 /** 778 * Setup the driver for use and register it with the eth layer 779 * @return 0 on success, -1 on error (causing caller to print error msg) 780 */ 781 int ne2k_register(void) 782 { 783 struct eth_device *dev; 784 785 dev = calloc(sizeof(*dev), 1); 786 if (dev == NULL) 787 return -1; 788 789 if (ne2k_setup_driver(dev)) 790 return -1; 791 792 dev->init = ne2k_init; 793 dev->halt = ne2k_halt; 794 dev->send = ne2k_send; 795 dev->recv = ne2k_recv; 796 797 sprintf(dev->name, "NE2000"); 798 799 return eth_register(dev); 800 } 801