1 /* 2 * (C) Copyright 2002 Wolfgang Grandegger, wg@denx.de. 3 * 4 * This driver for AMD PCnet network controllers is derived from the 5 * Linux driver pcnet32.c written 1996-1999 by Thomas Bogendoerfer. 6 * 7 * SPDX-License-Identifier: GPL-2.0+ 8 */ 9 10 #include <common.h> 11 #include <malloc.h> 12 #include <net.h> 13 #include <netdev.h> 14 #include <asm/io.h> 15 #include <pci.h> 16 17 #define PCNET_DEBUG_LEVEL 0 /* 0=off, 1=init, 2=rx/tx */ 18 19 #define PCNET_DEBUG1(fmt,args...) \ 20 debug_cond(PCNET_DEBUG_LEVEL > 0, fmt ,##args) 21 #define PCNET_DEBUG2(fmt,args...) \ 22 debug_cond(PCNET_DEBUG_LEVEL > 1, fmt ,##args) 23 24 #if !defined(CONF_PCNET_79C973) && defined(CONF_PCNET_79C975) 25 #error "Macro for PCnet chip version is not defined!" 26 #endif 27 28 /* 29 * Set the number of Tx and Rx buffers, using Log_2(# buffers). 30 * Reasonable default values are 4 Tx buffers, and 16 Rx buffers. 31 * That translates to 2 (4 == 2^^2) and 4 (16 == 2^^4). 32 */ 33 #define PCNET_LOG_TX_BUFFERS 0 34 #define PCNET_LOG_RX_BUFFERS 2 35 36 #define TX_RING_SIZE (1 << (PCNET_LOG_TX_BUFFERS)) 37 #define TX_RING_LEN_BITS ((PCNET_LOG_TX_BUFFERS) << 12) 38 39 #define RX_RING_SIZE (1 << (PCNET_LOG_RX_BUFFERS)) 40 #define RX_RING_LEN_BITS ((PCNET_LOG_RX_BUFFERS) << 4) 41 42 #define PKT_BUF_SZ 1544 43 44 /* The PCNET Rx and Tx ring descriptors. */ 45 struct pcnet_rx_head { 46 u32 base; 47 s16 buf_length; 48 s16 status; 49 u32 msg_length; 50 u32 reserved; 51 }; 52 53 struct pcnet_tx_head { 54 u32 base; 55 s16 length; 56 s16 status; 57 u32 misc; 58 u32 reserved; 59 }; 60 61 /* The PCNET 32-Bit initialization block, described in databook. */ 62 struct pcnet_init_block { 63 u16 mode; 64 u16 tlen_rlen; 65 u8 phys_addr[6]; 66 u16 reserved; 67 u32 filter[2]; 68 /* Receive and transmit ring base, along with extra bits. */ 69 u32 rx_ring; 70 u32 tx_ring; 71 u32 reserved2; 72 }; 73 74 typedef struct pcnet_priv { 75 struct pcnet_rx_head rx_ring[RX_RING_SIZE]; 76 struct pcnet_tx_head tx_ring[TX_RING_SIZE]; 77 struct pcnet_init_block init_block; 78 /* Receive Buffer space */ 79 unsigned char rx_buf[RX_RING_SIZE][PKT_BUF_SZ + 4]; 80 int cur_rx; 81 int cur_tx; 82 } pcnet_priv_t; 83 84 static pcnet_priv_t *lp; 85 86 /* Offsets from base I/O address for WIO mode */ 87 #define PCNET_RDP 0x10 88 #define PCNET_RAP 0x12 89 #define PCNET_RESET 0x14 90 #define PCNET_BDP 0x16 91 92 static u16 pcnet_read_csr(struct eth_device *dev, int index) 93 { 94 outw(index, dev->iobase + PCNET_RAP); 95 return inw(dev->iobase + PCNET_RDP); 96 } 97 98 static void pcnet_write_csr(struct eth_device *dev, int index, u16 val) 99 { 100 outw(index, dev->iobase + PCNET_RAP); 101 outw(val, dev->iobase + PCNET_RDP); 102 } 103 104 static u16 pcnet_read_bcr(struct eth_device *dev, int index) 105 { 106 outw(index, dev->iobase + PCNET_RAP); 107 return inw(dev->iobase + PCNET_BDP); 108 } 109 110 static void pcnet_write_bcr(struct eth_device *dev, int index, u16 val) 111 { 112 outw(index, dev->iobase + PCNET_RAP); 113 outw(val, dev->iobase + PCNET_BDP); 114 } 115 116 static void pcnet_reset(struct eth_device *dev) 117 { 118 inw(dev->iobase + PCNET_RESET); 119 } 120 121 static int pcnet_check(struct eth_device *dev) 122 { 123 outw(88, dev->iobase + PCNET_RAP); 124 return inw(dev->iobase + PCNET_RAP) == 88; 125 } 126 127 static int pcnet_init (struct eth_device *dev, bd_t * bis); 128 static int pcnet_send(struct eth_device *dev, void *packet, int length); 129 static int pcnet_recv (struct eth_device *dev); 130 static void pcnet_halt (struct eth_device *dev); 131 static int pcnet_probe (struct eth_device *dev, bd_t * bis, int dev_num); 132 133 #define PCI_TO_MEM(d, a) pci_virt_to_mem((pci_dev_t)d->priv, (a)) 134 #define PCI_TO_MEM_LE(d,a) (u32)(cpu_to_le32(PCI_TO_MEM(d,a))) 135 136 static struct pci_device_id supported[] = { 137 {PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LANCE}, 138 {} 139 }; 140 141 142 int pcnet_initialize(bd_t *bis) 143 { 144 pci_dev_t devbusfn; 145 struct eth_device *dev; 146 u16 command, status; 147 int dev_nr = 0; 148 149 PCNET_DEBUG1("\npcnet_initialize...\n"); 150 151 for (dev_nr = 0;; dev_nr++) { 152 153 /* 154 * Find the PCnet PCI device(s). 155 */ 156 devbusfn = pci_find_devices(supported, dev_nr); 157 if (devbusfn < 0) 158 break; 159 160 /* 161 * Allocate and pre-fill the device structure. 162 */ 163 dev = (struct eth_device *)malloc(sizeof(*dev)); 164 if (!dev) { 165 printf("pcnet: Can not allocate memory\n"); 166 break; 167 } 168 memset(dev, 0, sizeof(*dev)); 169 dev->priv = (void *)devbusfn; 170 sprintf(dev->name, "pcnet#%d", dev_nr); 171 172 /* 173 * Setup the PCI device. 174 */ 175 pci_read_config_dword(devbusfn, PCI_BASE_ADDRESS_0, 176 (unsigned int *)&dev->iobase); 177 dev->iobase = pci_io_to_phys(devbusfn, dev->iobase); 178 dev->iobase &= ~0xf; 179 180 PCNET_DEBUG1("%s: devbusfn=0x%x iobase=0x%x: ", 181 dev->name, devbusfn, dev->iobase); 182 183 command = PCI_COMMAND_IO | PCI_COMMAND_MASTER; 184 pci_write_config_word(devbusfn, PCI_COMMAND, command); 185 pci_read_config_word(devbusfn, PCI_COMMAND, &status); 186 if ((status & command) != command) { 187 printf("%s: Couldn't enable IO access or Bus Mastering\n", 188 dev->name); 189 free(dev); 190 continue; 191 } 192 193 pci_write_config_byte(devbusfn, PCI_LATENCY_TIMER, 0x40); 194 195 /* 196 * Probe the PCnet chip. 197 */ 198 if (pcnet_probe(dev, bis, dev_nr) < 0) { 199 free(dev); 200 continue; 201 } 202 203 /* 204 * Setup device structure and register the driver. 205 */ 206 dev->init = pcnet_init; 207 dev->halt = pcnet_halt; 208 dev->send = pcnet_send; 209 dev->recv = pcnet_recv; 210 211 eth_register(dev); 212 } 213 214 udelay(10 * 1000); 215 216 return dev_nr; 217 } 218 219 static int pcnet_probe(struct eth_device *dev, bd_t *bis, int dev_nr) 220 { 221 int chip_version; 222 char *chipname; 223 224 #ifdef PCNET_HAS_PROM 225 int i; 226 #endif 227 228 /* Reset the PCnet controller */ 229 pcnet_reset(dev); 230 231 /* Check if register access is working */ 232 if (pcnet_read_csr(dev, 0) != 4 || !pcnet_check(dev)) { 233 printf("%s: CSR register access check failed\n", dev->name); 234 return -1; 235 } 236 237 /* Identify the chip */ 238 chip_version = 239 pcnet_read_csr(dev, 88) | (pcnet_read_csr(dev, 89) << 16); 240 if ((chip_version & 0xfff) != 0x003) 241 return -1; 242 chip_version = (chip_version >> 12) & 0xffff; 243 switch (chip_version) { 244 case 0x2621: 245 chipname = "PCnet/PCI II 79C970A"; /* PCI */ 246 break; 247 #ifdef CONFIG_PCNET_79C973 248 case 0x2625: 249 chipname = "PCnet/FAST III 79C973"; /* PCI */ 250 break; 251 #endif 252 #ifdef CONFIG_PCNET_79C975 253 case 0x2627: 254 chipname = "PCnet/FAST III 79C975"; /* PCI */ 255 break; 256 #endif 257 default: 258 printf("%s: PCnet version %#x not supported\n", 259 dev->name, chip_version); 260 return -1; 261 } 262 263 PCNET_DEBUG1("AMD %s\n", chipname); 264 265 #ifdef PCNET_HAS_PROM 266 /* 267 * In most chips, after a chip reset, the ethernet address is read from 268 * the station address PROM at the base address and programmed into the 269 * "Physical Address Registers" CSR12-14. 270 */ 271 for (i = 0; i < 3; i++) { 272 unsigned int val; 273 274 val = pcnet_read_csr(dev, i + 12) & 0x0ffff; 275 /* There may be endianness issues here. */ 276 dev->enetaddr[2 * i] = val & 0x0ff; 277 dev->enetaddr[2 * i + 1] = (val >> 8) & 0x0ff; 278 } 279 #endif /* PCNET_HAS_PROM */ 280 281 return 0; 282 } 283 284 static int pcnet_init(struct eth_device *dev, bd_t *bis) 285 { 286 int i, val; 287 u32 addr; 288 289 PCNET_DEBUG1("%s: pcnet_init...\n", dev->name); 290 291 /* Switch pcnet to 32bit mode */ 292 pcnet_write_bcr(dev, 20, 2); 293 294 #ifdef CONFIG_PN62 295 /* Setup LED registers */ 296 val = pcnet_read_bcr(dev, 2) | 0x1000; 297 pcnet_write_bcr(dev, 2, val); /* enable LEDPE */ 298 pcnet_write_bcr(dev, 4, 0x5080); /* 100MBit */ 299 pcnet_write_bcr(dev, 5, 0x40c0); /* LNKSE */ 300 pcnet_write_bcr(dev, 6, 0x4090); /* TX Activity */ 301 pcnet_write_bcr(dev, 7, 0x4084); /* RX Activity */ 302 #endif 303 304 /* Set/reset autoselect bit */ 305 val = pcnet_read_bcr(dev, 2) & ~2; 306 val |= 2; 307 pcnet_write_bcr(dev, 2, val); 308 309 /* Enable auto negotiate, setup, disable fd */ 310 val = pcnet_read_bcr(dev, 32) & ~0x98; 311 val |= 0x20; 312 pcnet_write_bcr(dev, 32, val); 313 314 /* 315 * Enable NOUFLO on supported controllers, with the transmit 316 * start point set to the full packet. This will cause entire 317 * packets to be buffered by the ethernet controller before 318 * transmission, eliminating underflows which are common on 319 * slower devices. Controllers which do not support NOUFLO will 320 * simply be left with a larger transmit FIFO threshold. 321 */ 322 val = pcnet_read_bcr(dev, 18); 323 val |= 1 << 11; 324 pcnet_write_bcr(dev, 18, val); 325 val = pcnet_read_csr(dev, 80); 326 val |= 0x3 << 10; 327 pcnet_write_csr(dev, 80, val); 328 329 /* 330 * We only maintain one structure because the drivers will never 331 * be used concurrently. In 32bit mode the RX and TX ring entries 332 * must be aligned on 16-byte boundaries. 333 */ 334 if (lp == NULL) { 335 addr = (u32)malloc(sizeof(pcnet_priv_t) + 0x10); 336 addr = (addr + 0xf) & ~0xf; 337 lp = (pcnet_priv_t *)addr; 338 } 339 340 lp->init_block.mode = cpu_to_le16(0x0000); 341 lp->init_block.filter[0] = 0x00000000; 342 lp->init_block.filter[1] = 0x00000000; 343 344 /* 345 * Initialize the Rx ring. 346 */ 347 lp->cur_rx = 0; 348 for (i = 0; i < RX_RING_SIZE; i++) { 349 lp->rx_ring[i].base = PCI_TO_MEM_LE(dev, lp->rx_buf[i]); 350 lp->rx_ring[i].buf_length = cpu_to_le16(-PKT_BUF_SZ); 351 lp->rx_ring[i].status = cpu_to_le16(0x8000); 352 PCNET_DEBUG1 353 ("Rx%d: base=0x%x buf_length=0x%hx status=0x%hx\n", i, 354 lp->rx_ring[i].base, lp->rx_ring[i].buf_length, 355 lp->rx_ring[i].status); 356 } 357 358 /* 359 * Initialize the Tx ring. The Tx buffer address is filled in as 360 * needed, but we do need to clear the upper ownership bit. 361 */ 362 lp->cur_tx = 0; 363 for (i = 0; i < TX_RING_SIZE; i++) { 364 lp->tx_ring[i].base = 0; 365 lp->tx_ring[i].status = 0; 366 } 367 368 /* 369 * Setup Init Block. 370 */ 371 PCNET_DEBUG1("Init block at 0x%p: MAC", &lp->init_block); 372 373 for (i = 0; i < 6; i++) { 374 lp->init_block.phys_addr[i] = dev->enetaddr[i]; 375 PCNET_DEBUG1(" %02x", lp->init_block.phys_addr[i]); 376 } 377 378 lp->init_block.tlen_rlen = cpu_to_le16(TX_RING_LEN_BITS | 379 RX_RING_LEN_BITS); 380 lp->init_block.rx_ring = PCI_TO_MEM_LE(dev, lp->rx_ring); 381 lp->init_block.tx_ring = PCI_TO_MEM_LE(dev, lp->tx_ring); 382 flush_dcache_range((unsigned long)lp, (unsigned long)&lp->rx_buf); 383 384 PCNET_DEBUG1("\ntlen_rlen=0x%x rx_ring=0x%x tx_ring=0x%x\n", 385 lp->init_block.tlen_rlen, 386 lp->init_block.rx_ring, lp->init_block.tx_ring); 387 388 /* 389 * Tell the controller where the Init Block is located. 390 */ 391 addr = PCI_TO_MEM(dev, &lp->init_block); 392 pcnet_write_csr(dev, 1, addr & 0xffff); 393 pcnet_write_csr(dev, 2, (addr >> 16) & 0xffff); 394 395 pcnet_write_csr(dev, 4, 0x0915); 396 pcnet_write_csr(dev, 0, 0x0001); /* start */ 397 398 /* Wait for Init Done bit */ 399 for (i = 10000; i > 0; i--) { 400 if (pcnet_read_csr(dev, 0) & 0x0100) 401 break; 402 udelay(10); 403 } 404 if (i <= 0) { 405 printf("%s: TIMEOUT: controller init failed\n", dev->name); 406 pcnet_reset(dev); 407 return -1; 408 } 409 410 /* 411 * Finally start network controller operation. 412 */ 413 pcnet_write_csr(dev, 0, 0x0002); 414 415 return 0; 416 } 417 418 static int pcnet_send(struct eth_device *dev, void *packet, int pkt_len) 419 { 420 int i, status; 421 struct pcnet_tx_head *entry = &lp->tx_ring[lp->cur_tx]; 422 423 PCNET_DEBUG2("Tx%d: %d bytes from 0x%p ", lp->cur_tx, pkt_len, 424 packet); 425 426 flush_dcache_range((unsigned long)packet, 427 (unsigned long)packet + pkt_len); 428 429 /* Wait for completion by testing the OWN bit */ 430 for (i = 1000; i > 0; i--) { 431 invalidate_dcache_range((unsigned long)entry, 432 (unsigned long)entry + sizeof(*entry)); 433 status = le16_to_cpu(entry->status); 434 if ((status & 0x8000) == 0) 435 break; 436 udelay(100); 437 PCNET_DEBUG2("."); 438 } 439 if (i <= 0) { 440 printf("%s: TIMEOUT: Tx%d failed (status = 0x%x)\n", 441 dev->name, lp->cur_tx, status); 442 pkt_len = 0; 443 goto failure; 444 } 445 446 /* 447 * Setup Tx ring. Caution: the write order is important here, 448 * set the status with the "ownership" bits last. 449 */ 450 status = 0x8300; 451 entry->length = cpu_to_le16(-pkt_len); 452 entry->misc = 0x00000000; 453 entry->base = PCI_TO_MEM_LE(dev, packet); 454 entry->status = cpu_to_le16(status); 455 flush_dcache_range((unsigned long)entry, 456 (unsigned long)entry + sizeof(*entry)); 457 458 /* Trigger an immediate send poll. */ 459 pcnet_write_csr(dev, 0, 0x0008); 460 461 failure: 462 if (++lp->cur_tx >= TX_RING_SIZE) 463 lp->cur_tx = 0; 464 465 PCNET_DEBUG2("done\n"); 466 return pkt_len; 467 } 468 469 static int pcnet_recv (struct eth_device *dev) 470 { 471 struct pcnet_rx_head *entry; 472 int pkt_len = 0; 473 u16 status; 474 475 while (1) { 476 entry = &lp->rx_ring[lp->cur_rx]; 477 invalidate_dcache_range((unsigned long)entry, 478 (unsigned long)entry + sizeof(*entry)); 479 /* 480 * If we own the next entry, it's a new packet. Send it up. 481 */ 482 status = le16_to_cpu(entry->status); 483 if ((status & 0x8000) != 0) 484 break; 485 status >>= 8; 486 487 if (status != 0x03) { /* There was an error. */ 488 printf("%s: Rx%d", dev->name, lp->cur_rx); 489 PCNET_DEBUG1(" (status=0x%x)", status); 490 if (status & 0x20) 491 printf(" Frame"); 492 if (status & 0x10) 493 printf(" Overflow"); 494 if (status & 0x08) 495 printf(" CRC"); 496 if (status & 0x04) 497 printf(" Fifo"); 498 printf(" Error\n"); 499 entry->status &= le16_to_cpu(0x03ff); 500 501 } else { 502 pkt_len = (le32_to_cpu(entry->msg_length) & 0xfff) - 4; 503 if (pkt_len < 60) { 504 printf("%s: Rx%d: invalid packet length %d\n", 505 dev->name, lp->cur_rx, pkt_len); 506 } else { 507 invalidate_dcache_range( 508 (unsigned long)lp->rx_buf[lp->cur_rx], 509 (unsigned long)lp->rx_buf[lp->cur_rx] + 510 pkt_len); 511 NetReceive(lp->rx_buf[lp->cur_rx], pkt_len); 512 PCNET_DEBUG2("Rx%d: %d bytes from 0x%p\n", 513 lp->cur_rx, pkt_len, 514 lp->rx_buf[lp->cur_rx]); 515 } 516 } 517 entry->status |= cpu_to_le16(0x8000); 518 flush_dcache_range((unsigned long)entry, 519 (unsigned long)entry + sizeof(*entry)); 520 521 if (++lp->cur_rx >= RX_RING_SIZE) 522 lp->cur_rx = 0; 523 } 524 return pkt_len; 525 } 526 527 static void pcnet_halt(struct eth_device *dev) 528 { 529 int i; 530 531 PCNET_DEBUG1("%s: pcnet_halt...\n", dev->name); 532 533 /* Reset the PCnet controller */ 534 pcnet_reset(dev); 535 536 /* Wait for Stop bit */ 537 for (i = 1000; i > 0; i--) { 538 if (pcnet_read_csr(dev, 0) & 0x4) 539 break; 540 udelay(10); 541 } 542 if (i <= 0) 543 printf("%s: TIMEOUT: controller reset failed\n", dev->name); 544 } 545