1 /* sun3lance.c: Ethernet driver for SUN3 Lance chip */ 2 /* 3 4 Sun3 Lance ethernet driver, by Sam Creasey (sammy@users.qual.net). 5 This driver is a part of the linux kernel, and is thus distributed 6 under the GNU General Public License. 7 8 The values used in LANCE_OBIO and LANCE_IRQ seem to be empirically 9 true for the correct IRQ and address of the lance registers. They 10 have not been widely tested, however. What we probably need is a 11 "proper" way to search for a device in the sun3's prom, but, alas, 12 linux has no such thing. 13 14 This driver is largely based on atarilance.c, by Roman Hodek. Other 15 sources of inspiration were the NetBSD sun3 am7990 driver, and the 16 linux sparc lance driver (sunlance.c). 17 18 There are more assumptions made throughout this driver, it almost 19 certainly still needs work, but it does work at least for RARP/BOOTP and 20 mounting the root NFS filesystem. 21 22 */ 23 24 static char *version = "sun3lance.c: v1.2 1/12/2001 Sam Creasey (sammy@sammy.net)\n"; 25 26 #include <linux/module.h> 27 #include <linux/stddef.h> 28 #include <linux/kernel.h> 29 #include <linux/string.h> 30 #include <linux/errno.h> 31 #include <linux/interrupt.h> 32 #include <linux/init.h> 33 #include <linux/ioport.h> 34 #include <linux/delay.h> 35 #include <linux/netdevice.h> 36 #include <linux/etherdevice.h> 37 #include <linux/skbuff.h> 38 #include <linux/bitops.h> 39 40 #include <asm/cacheflush.h> 41 #include <asm/setup.h> 42 #include <asm/irq.h> 43 #include <asm/io.h> 44 #include <asm/pgtable.h> 45 #include <asm/dvma.h> 46 #include <asm/idprom.h> 47 #include <asm/machines.h> 48 49 #ifdef CONFIG_SUN3 50 #include <asm/sun3mmu.h> 51 #else 52 #include <asm/sun3xprom.h> 53 #endif 54 55 /* sun3/60 addr/irq for the lance chip. If your sun is different, 56 change this. */ 57 #define LANCE_OBIO 0x120000 58 #define LANCE_IRQ IRQ_AUTO_3 59 60 /* Debug level: 61 * 0 = silent, print only serious errors 62 * 1 = normal, print error messages 63 * 2 = debug, print debug infos 64 * 3 = debug, print even more debug infos (packet data) 65 */ 66 67 #define LANCE_DEBUG 0 68 69 #ifdef LANCE_DEBUG 70 static int lance_debug = LANCE_DEBUG; 71 #else 72 static int lance_debug = 1; 73 #endif 74 module_param(lance_debug, int, 0); 75 MODULE_PARM_DESC(lance_debug, "SUN3 Lance debug level (0-3)"); 76 MODULE_LICENSE("GPL"); 77 78 #define DPRINTK(n,a) \ 79 do { \ 80 if (lance_debug >= n) \ 81 printk a; \ 82 } while( 0 ) 83 84 85 /* we're only using 32k of memory, so we use 4 TX 86 buffers and 16 RX buffers. These values are expressed as log2. */ 87 88 #define TX_LOG_RING_SIZE 3 89 #define RX_LOG_RING_SIZE 5 90 91 /* These are the derived values */ 92 93 #define TX_RING_SIZE (1 << TX_LOG_RING_SIZE) 94 #define TX_RING_LEN_BITS (TX_LOG_RING_SIZE << 5) 95 #define TX_RING_MOD_MASK (TX_RING_SIZE - 1) 96 97 #define RX_RING_SIZE (1 << RX_LOG_RING_SIZE) 98 #define RX_RING_LEN_BITS (RX_LOG_RING_SIZE << 5) 99 #define RX_RING_MOD_MASK (RX_RING_SIZE - 1) 100 101 /* Definitions for packet buffer access: */ 102 #define PKT_BUF_SZ 1544 103 104 /* Get the address of a packet buffer corresponding to a given buffer head */ 105 #define PKTBUF_ADDR(head) (void *)((unsigned long)(MEM) | (head)->base) 106 107 108 /* The LANCE Rx and Tx ring descriptors. */ 109 struct lance_rx_head { 110 unsigned short base; /* Low word of base addr */ 111 volatile unsigned char flag; 112 unsigned char base_hi; /* High word of base addr (unused) */ 113 short buf_length; /* This length is 2s complement! */ 114 volatile short msg_length; /* This length is "normal". */ 115 }; 116 117 struct lance_tx_head { 118 unsigned short base; /* Low word of base addr */ 119 volatile unsigned char flag; 120 unsigned char base_hi; /* High word of base addr (unused) */ 121 short length; /* Length is 2s complement! */ 122 volatile short misc; 123 }; 124 125 /* The LANCE initialization block, described in databook. */ 126 struct lance_init_block { 127 unsigned short mode; /* Pre-set mode */ 128 unsigned char hwaddr[6]; /* Physical ethernet address */ 129 unsigned int filter[2]; /* Multicast filter (unused). */ 130 /* Receive and transmit ring base, along with length bits. */ 131 unsigned short rdra; 132 unsigned short rlen; 133 unsigned short tdra; 134 unsigned short tlen; 135 unsigned short pad[4]; /* is thie needed? */ 136 }; 137 138 /* The whole layout of the Lance shared memory */ 139 struct lance_memory { 140 struct lance_init_block init; 141 struct lance_tx_head tx_head[TX_RING_SIZE]; 142 struct lance_rx_head rx_head[RX_RING_SIZE]; 143 char rx_data[RX_RING_SIZE][PKT_BUF_SZ]; 144 char tx_data[TX_RING_SIZE][PKT_BUF_SZ]; 145 }; 146 147 /* The driver's private device structure */ 148 149 struct lance_private { 150 volatile unsigned short *iobase; 151 struct lance_memory *mem; 152 int new_rx, new_tx; /* The next free ring entry */ 153 int old_tx, old_rx; /* ring entry to be processed */ 154 /* These two must be longs for set_bit() */ 155 long tx_full; 156 long lock; 157 }; 158 159 /* I/O register access macros */ 160 161 #define MEM lp->mem 162 #define DREG lp->iobase[0] 163 #define AREG lp->iobase[1] 164 #define REGA(a) (*( AREG = (a), &DREG )) 165 166 /* Definitions for the Lance */ 167 168 /* tx_head flags */ 169 #define TMD1_ENP 0x01 /* end of packet */ 170 #define TMD1_STP 0x02 /* start of packet */ 171 #define TMD1_DEF 0x04 /* deferred */ 172 #define TMD1_ONE 0x08 /* one retry needed */ 173 #define TMD1_MORE 0x10 /* more than one retry needed */ 174 #define TMD1_ERR 0x40 /* error summary */ 175 #define TMD1_OWN 0x80 /* ownership (set: chip owns) */ 176 177 #define TMD1_OWN_CHIP TMD1_OWN 178 #define TMD1_OWN_HOST 0 179 180 /* tx_head misc field */ 181 #define TMD3_TDR 0x03FF /* Time Domain Reflectometry counter */ 182 #define TMD3_RTRY 0x0400 /* failed after 16 retries */ 183 #define TMD3_LCAR 0x0800 /* carrier lost */ 184 #define TMD3_LCOL 0x1000 /* late collision */ 185 #define TMD3_UFLO 0x4000 /* underflow (late memory) */ 186 #define TMD3_BUFF 0x8000 /* buffering error (no ENP) */ 187 188 /* rx_head flags */ 189 #define RMD1_ENP 0x01 /* end of packet */ 190 #define RMD1_STP 0x02 /* start of packet */ 191 #define RMD1_BUFF 0x04 /* buffer error */ 192 #define RMD1_CRC 0x08 /* CRC error */ 193 #define RMD1_OFLO 0x10 /* overflow */ 194 #define RMD1_FRAM 0x20 /* framing error */ 195 #define RMD1_ERR 0x40 /* error summary */ 196 #define RMD1_OWN 0x80 /* ownership (set: ship owns) */ 197 198 #define RMD1_OWN_CHIP RMD1_OWN 199 #define RMD1_OWN_HOST 0 200 201 /* register names */ 202 #define CSR0 0 /* mode/status */ 203 #define CSR1 1 /* init block addr (low) */ 204 #define CSR2 2 /* init block addr (high) */ 205 #define CSR3 3 /* misc */ 206 #define CSR8 8 /* address filter */ 207 #define CSR15 15 /* promiscuous mode */ 208 209 /* CSR0 */ 210 /* (R=readable, W=writeable, S=set on write, C=clear on write) */ 211 #define CSR0_INIT 0x0001 /* initialize (RS) */ 212 #define CSR0_STRT 0x0002 /* start (RS) */ 213 #define CSR0_STOP 0x0004 /* stop (RS) */ 214 #define CSR0_TDMD 0x0008 /* transmit demand (RS) */ 215 #define CSR0_TXON 0x0010 /* transmitter on (R) */ 216 #define CSR0_RXON 0x0020 /* receiver on (R) */ 217 #define CSR0_INEA 0x0040 /* interrupt enable (RW) */ 218 #define CSR0_INTR 0x0080 /* interrupt active (R) */ 219 #define CSR0_IDON 0x0100 /* initialization done (RC) */ 220 #define CSR0_TINT 0x0200 /* transmitter interrupt (RC) */ 221 #define CSR0_RINT 0x0400 /* receiver interrupt (RC) */ 222 #define CSR0_MERR 0x0800 /* memory error (RC) */ 223 #define CSR0_MISS 0x1000 /* missed frame (RC) */ 224 #define CSR0_CERR 0x2000 /* carrier error (no heartbeat :-) (RC) */ 225 #define CSR0_BABL 0x4000 /* babble: tx-ed too many bits (RC) */ 226 #define CSR0_ERR 0x8000 /* error (RC) */ 227 228 /* CSR3 */ 229 #define CSR3_BCON 0x0001 /* byte control */ 230 #define CSR3_ACON 0x0002 /* ALE control */ 231 #define CSR3_BSWP 0x0004 /* byte swap (1=big endian) */ 232 233 /***************************** Prototypes *****************************/ 234 235 static int lance_probe( struct net_device *dev); 236 static int lance_open( struct net_device *dev ); 237 static void lance_init_ring( struct net_device *dev ); 238 static int lance_start_xmit( struct sk_buff *skb, struct net_device *dev ); 239 static irqreturn_t lance_interrupt( int irq, void *dev_id); 240 static int lance_rx( struct net_device *dev ); 241 static int lance_close( struct net_device *dev ); 242 static void set_multicast_list( struct net_device *dev ); 243 244 /************************* End of Prototypes **************************/ 245 246 struct net_device * __init sun3lance_probe(int unit) 247 { 248 struct net_device *dev; 249 static int found; 250 int err = -ENODEV; 251 252 if (!MACH_IS_SUN3 && !MACH_IS_SUN3X) 253 return ERR_PTR(-ENODEV); 254 255 /* check that this machine has an onboard lance */ 256 switch(idprom->id_machtype) { 257 case SM_SUN3|SM_3_50: 258 case SM_SUN3|SM_3_60: 259 case SM_SUN3X|SM_3_80: 260 /* these machines have lance */ 261 break; 262 263 default: 264 return ERR_PTR(-ENODEV); 265 } 266 267 if (found) 268 return ERR_PTR(-ENODEV); 269 270 dev = alloc_etherdev(sizeof(struct lance_private)); 271 if (!dev) 272 return ERR_PTR(-ENOMEM); 273 if (unit >= 0) { 274 sprintf(dev->name, "eth%d", unit); 275 netdev_boot_setup_check(dev); 276 } 277 278 if (!lance_probe(dev)) 279 goto out; 280 281 err = register_netdev(dev); 282 if (err) 283 goto out1; 284 found = 1; 285 return dev; 286 287 out1: 288 #ifdef CONFIG_SUN3 289 iounmap((void __iomem *)dev->base_addr); 290 #endif 291 out: 292 free_netdev(dev); 293 return ERR_PTR(err); 294 } 295 296 static const struct net_device_ops lance_netdev_ops = { 297 .ndo_open = lance_open, 298 .ndo_stop = lance_close, 299 .ndo_start_xmit = lance_start_xmit, 300 .ndo_set_multicast_list = set_multicast_list, 301 .ndo_set_mac_address = NULL, 302 .ndo_change_mtu = eth_change_mtu, 303 .ndo_validate_addr = eth_validate_addr, 304 }; 305 306 static int __init lance_probe( struct net_device *dev) 307 { 308 unsigned long ioaddr; 309 310 struct lance_private *lp; 311 int i; 312 static int did_version; 313 volatile unsigned short *ioaddr_probe; 314 unsigned short tmp1, tmp2; 315 316 #ifdef CONFIG_SUN3 317 ioaddr = (unsigned long)ioremap(LANCE_OBIO, PAGE_SIZE); 318 if (!ioaddr) 319 return 0; 320 #else 321 ioaddr = SUN3X_LANCE; 322 #endif 323 324 /* test to see if there's really a lance here */ 325 /* (CSRO_INIT shouldn't be readable) */ 326 327 ioaddr_probe = (volatile unsigned short *)ioaddr; 328 tmp1 = ioaddr_probe[0]; 329 tmp2 = ioaddr_probe[1]; 330 331 ioaddr_probe[1] = CSR0; 332 ioaddr_probe[0] = CSR0_INIT | CSR0_STOP; 333 334 if(ioaddr_probe[0] != CSR0_STOP) { 335 ioaddr_probe[0] = tmp1; 336 ioaddr_probe[1] = tmp2; 337 338 #ifdef CONFIG_SUN3 339 iounmap((void __iomem *)ioaddr); 340 #endif 341 return 0; 342 } 343 344 lp = netdev_priv(dev); 345 346 /* XXX - leak? */ 347 MEM = dvma_malloc_align(sizeof(struct lance_memory), 0x10000); 348 if (MEM == NULL) { 349 #ifdef CONFIG_SUN3 350 iounmap((void __iomem *)ioaddr); 351 #endif 352 printk(KERN_WARNING "SUN3 Lance couldn't allocate DVMA memory\n"); 353 return 0; 354 } 355 356 lp->iobase = (volatile unsigned short *)ioaddr; 357 dev->base_addr = (unsigned long)ioaddr; /* informational only */ 358 359 REGA(CSR0) = CSR0_STOP; 360 361 if (request_irq(LANCE_IRQ, lance_interrupt, IRQF_DISABLED, "SUN3 Lance", dev) < 0) { 362 #ifdef CONFIG_SUN3 363 iounmap((void __iomem *)ioaddr); 364 #endif 365 dvma_free((void *)MEM); 366 printk(KERN_WARNING "SUN3 Lance unable to allocate IRQ\n"); 367 return 0; 368 } 369 dev->irq = (unsigned short)LANCE_IRQ; 370 371 372 printk("%s: SUN3 Lance at io %#lx, mem %#lx, irq %d, hwaddr ", 373 dev->name, 374 (unsigned long)ioaddr, 375 (unsigned long)MEM, 376 dev->irq); 377 378 /* copy in the ethernet address from the prom */ 379 for(i = 0; i < 6 ; i++) 380 dev->dev_addr[i] = idprom->id_ethaddr[i]; 381 382 /* tell the card it's ether address, bytes swapped */ 383 MEM->init.hwaddr[0] = dev->dev_addr[1]; 384 MEM->init.hwaddr[1] = dev->dev_addr[0]; 385 MEM->init.hwaddr[2] = dev->dev_addr[3]; 386 MEM->init.hwaddr[3] = dev->dev_addr[2]; 387 MEM->init.hwaddr[4] = dev->dev_addr[5]; 388 MEM->init.hwaddr[5] = dev->dev_addr[4]; 389 390 printk("%pM\n", dev->dev_addr); 391 392 MEM->init.mode = 0x0000; 393 MEM->init.filter[0] = 0x00000000; 394 MEM->init.filter[1] = 0x00000000; 395 MEM->init.rdra = dvma_vtob(MEM->rx_head); 396 MEM->init.rlen = (RX_LOG_RING_SIZE << 13) | 397 (dvma_vtob(MEM->rx_head) >> 16); 398 MEM->init.tdra = dvma_vtob(MEM->tx_head); 399 MEM->init.tlen = (TX_LOG_RING_SIZE << 13) | 400 (dvma_vtob(MEM->tx_head) >> 16); 401 402 DPRINTK(2, ("initaddr: %08lx rx_ring: %08lx tx_ring: %08lx\n", 403 dvma_vtob(&(MEM->init)), dvma_vtob(MEM->rx_head), 404 (dvma_vtob(MEM->tx_head)))); 405 406 if (did_version++ == 0) 407 printk( version ); 408 409 dev->netdev_ops = &lance_netdev_ops; 410 // KLUDGE -- REMOVE ME 411 set_bit(__LINK_STATE_PRESENT, &dev->state); 412 413 414 return 1; 415 } 416 417 static int lance_open( struct net_device *dev ) 418 { 419 struct lance_private *lp = netdev_priv(dev); 420 int i; 421 422 DPRINTK( 2, ( "%s: lance_open()\n", dev->name )); 423 424 REGA(CSR0) = CSR0_STOP; 425 426 lance_init_ring(dev); 427 428 /* From now on, AREG is kept to point to CSR0 */ 429 REGA(CSR0) = CSR0_INIT; 430 431 i = 1000000; 432 while (--i > 0) 433 if (DREG & CSR0_IDON) 434 break; 435 if (i <= 0 || (DREG & CSR0_ERR)) { 436 DPRINTK( 2, ( "lance_open(): opening %s failed, i=%d, csr0=%04x\n", 437 dev->name, i, DREG )); 438 DREG = CSR0_STOP; 439 return -EIO; 440 } 441 442 DREG = CSR0_IDON | CSR0_STRT | CSR0_INEA; 443 444 netif_start_queue(dev); 445 446 DPRINTK( 2, ( "%s: LANCE is open, csr0 %04x\n", dev->name, DREG )); 447 448 return 0; 449 } 450 451 452 /* Initialize the LANCE Rx and Tx rings. */ 453 454 static void lance_init_ring( struct net_device *dev ) 455 { 456 struct lance_private *lp = netdev_priv(dev); 457 int i; 458 459 lp->lock = 0; 460 lp->tx_full = 0; 461 lp->new_rx = lp->new_tx = 0; 462 lp->old_rx = lp->old_tx = 0; 463 464 for( i = 0; i < TX_RING_SIZE; i++ ) { 465 MEM->tx_head[i].base = dvma_vtob(MEM->tx_data[i]); 466 MEM->tx_head[i].flag = 0; 467 MEM->tx_head[i].base_hi = 468 (dvma_vtob(MEM->tx_data[i])) >>16; 469 MEM->tx_head[i].length = 0; 470 MEM->tx_head[i].misc = 0; 471 } 472 473 for( i = 0; i < RX_RING_SIZE; i++ ) { 474 MEM->rx_head[i].base = dvma_vtob(MEM->rx_data[i]); 475 MEM->rx_head[i].flag = RMD1_OWN_CHIP; 476 MEM->rx_head[i].base_hi = 477 (dvma_vtob(MEM->rx_data[i])) >> 16; 478 MEM->rx_head[i].buf_length = -PKT_BUF_SZ | 0xf000; 479 MEM->rx_head[i].msg_length = 0; 480 } 481 482 /* tell the card it's ether address, bytes swapped */ 483 MEM->init.hwaddr[0] = dev->dev_addr[1]; 484 MEM->init.hwaddr[1] = dev->dev_addr[0]; 485 MEM->init.hwaddr[2] = dev->dev_addr[3]; 486 MEM->init.hwaddr[3] = dev->dev_addr[2]; 487 MEM->init.hwaddr[4] = dev->dev_addr[5]; 488 MEM->init.hwaddr[5] = dev->dev_addr[4]; 489 490 MEM->init.mode = 0x0000; 491 MEM->init.filter[0] = 0x00000000; 492 MEM->init.filter[1] = 0x00000000; 493 MEM->init.rdra = dvma_vtob(MEM->rx_head); 494 MEM->init.rlen = (RX_LOG_RING_SIZE << 13) | 495 (dvma_vtob(MEM->rx_head) >> 16); 496 MEM->init.tdra = dvma_vtob(MEM->tx_head); 497 MEM->init.tlen = (TX_LOG_RING_SIZE << 13) | 498 (dvma_vtob(MEM->tx_head) >> 16); 499 500 501 /* tell the lance the address of its init block */ 502 REGA(CSR1) = dvma_vtob(&(MEM->init)); 503 REGA(CSR2) = dvma_vtob(&(MEM->init)) >> 16; 504 505 #ifdef CONFIG_SUN3X 506 REGA(CSR3) = CSR3_BSWP | CSR3_ACON | CSR3_BCON; 507 #else 508 REGA(CSR3) = CSR3_BSWP; 509 #endif 510 511 } 512 513 514 static int lance_start_xmit( struct sk_buff *skb, struct net_device *dev ) 515 { 516 struct lance_private *lp = netdev_priv(dev); 517 int entry, len; 518 struct lance_tx_head *head; 519 unsigned long flags; 520 521 DPRINTK( 1, ( "%s: transmit start.\n", 522 dev->name)); 523 524 /* Transmitter timeout, serious problems. */ 525 if (netif_queue_stopped(dev)) { 526 int tickssofar = jiffies - dev_trans_start(dev); 527 if (tickssofar < HZ/5) 528 return NETDEV_TX_BUSY; 529 530 DPRINTK( 1, ( "%s: transmit timed out, status %04x, resetting.\n", 531 dev->name, DREG )); 532 DREG = CSR0_STOP; 533 /* 534 * Always set BSWP after a STOP as STOP puts it back into 535 * little endian mode. 536 */ 537 REGA(CSR3) = CSR3_BSWP; 538 dev->stats.tx_errors++; 539 540 if(lance_debug >= 2) { 541 int i; 542 printk("Ring data: old_tx %d new_tx %d%s new_rx %d\n", 543 lp->old_tx, lp->new_tx, 544 lp->tx_full ? " (full)" : "", 545 lp->new_rx ); 546 for( i = 0 ; i < RX_RING_SIZE; i++ ) 547 printk( "rx #%d: base=%04x blen=%04x mlen=%04x\n", 548 i, MEM->rx_head[i].base, 549 -MEM->rx_head[i].buf_length, 550 MEM->rx_head[i].msg_length); 551 for( i = 0 ; i < TX_RING_SIZE; i++ ) 552 printk("tx #%d: base=%04x len=%04x misc=%04x\n", 553 i, MEM->tx_head[i].base, 554 -MEM->tx_head[i].length, 555 MEM->tx_head[i].misc ); 556 } 557 558 lance_init_ring(dev); 559 REGA( CSR0 ) = CSR0_INEA | CSR0_INIT | CSR0_STRT; 560 561 netif_start_queue(dev); 562 563 return NETDEV_TX_OK; 564 } 565 566 567 /* Block a timer-based transmit from overlapping. This could better be 568 done with atomic_swap(1, dev->tbusy), but set_bit() works as well. */ 569 570 /* Block a timer-based transmit from overlapping with us by 571 stopping the queue for a bit... */ 572 573 netif_stop_queue(dev); 574 575 if (test_and_set_bit( 0, (void*)&lp->lock ) != 0) { 576 printk( "%s: tx queue lock!.\n", dev->name); 577 /* don't clear dev->tbusy flag. */ 578 return NETDEV_TX_BUSY; 579 } 580 581 AREG = CSR0; 582 DPRINTK( 2, ( "%s: lance_start_xmit() called, csr0 %4.4x.\n", 583 dev->name, DREG )); 584 585 #ifdef CONFIG_SUN3X 586 /* this weirdness doesn't appear on sun3... */ 587 if(!(DREG & CSR0_INIT)) { 588 DPRINTK( 1, ("INIT not set, reinitializing...\n")); 589 REGA( CSR0 ) = CSR0_STOP; 590 lance_init_ring(dev); 591 REGA( CSR0 ) = CSR0_INIT | CSR0_STRT; 592 } 593 #endif 594 595 /* Fill in a Tx ring entry */ 596 #if 0 597 if (lance_debug >= 2) { 598 printk( "%s: TX pkt %d type 0x%04x" 599 " from %s to %s" 600 " data at 0x%08x len %d\n", 601 dev->name, lp->new_tx, ((u_short *)skb->data)[6], 602 DEV_ADDR(&skb->data[6]), DEV_ADDR(skb->data), 603 (int)skb->data, (int)skb->len ); 604 } 605 #endif 606 /* We're not prepared for the int until the last flags are set/reset. 607 * And the int may happen already after setting the OWN_CHIP... */ 608 local_irq_save(flags); 609 610 /* Mask to ring buffer boundary. */ 611 entry = lp->new_tx; 612 head = &(MEM->tx_head[entry]); 613 614 /* Caution: the write order is important here, set the "ownership" bits 615 * last. 616 */ 617 618 /* the sun3's lance needs it's buffer padded to the minimum 619 size */ 620 len = (ETH_ZLEN < skb->len) ? skb->len : ETH_ZLEN; 621 622 // head->length = -len; 623 head->length = (-len) | 0xf000; 624 head->misc = 0; 625 626 skb_copy_from_linear_data(skb, PKTBUF_ADDR(head), skb->len); 627 if (len != skb->len) 628 memset(PKTBUF_ADDR(head) + skb->len, 0, len-skb->len); 629 630 head->flag = TMD1_OWN_CHIP | TMD1_ENP | TMD1_STP; 631 lp->new_tx = (lp->new_tx + 1) & TX_RING_MOD_MASK; 632 dev->stats.tx_bytes += skb->len; 633 634 /* Trigger an immediate send poll. */ 635 REGA(CSR0) = CSR0_INEA | CSR0_TDMD | CSR0_STRT; 636 AREG = CSR0; 637 DPRINTK( 2, ( "%s: lance_start_xmit() exiting, csr0 %4.4x.\n", 638 dev->name, DREG )); 639 dev_kfree_skb(skb); 640 641 lp->lock = 0; 642 if ((MEM->tx_head[(entry+1) & TX_RING_MOD_MASK].flag & TMD1_OWN) == 643 TMD1_OWN_HOST) 644 netif_start_queue(dev); 645 646 local_irq_restore(flags); 647 648 return NETDEV_TX_OK; 649 } 650 651 /* The LANCE interrupt handler. */ 652 653 static irqreturn_t lance_interrupt( int irq, void *dev_id) 654 { 655 struct net_device *dev = dev_id; 656 struct lance_private *lp = netdev_priv(dev); 657 int csr0; 658 static int in_interrupt; 659 660 if (dev == NULL) { 661 DPRINTK( 1, ( "lance_interrupt(): invalid dev_id\n" )); 662 return IRQ_NONE; 663 } 664 665 if (in_interrupt) 666 DPRINTK( 2, ( "%s: Re-entering the interrupt handler.\n", dev->name )); 667 in_interrupt = 1; 668 669 still_more: 670 flush_cache_all(); 671 672 AREG = CSR0; 673 csr0 = DREG; 674 675 /* ack interrupts */ 676 DREG = csr0 & (CSR0_TINT | CSR0_RINT | CSR0_IDON); 677 678 /* clear errors */ 679 if(csr0 & CSR0_ERR) 680 DREG = CSR0_BABL | CSR0_MERR | CSR0_CERR | CSR0_MISS; 681 682 683 DPRINTK( 2, ( "%s: interrupt csr0=%04x new csr=%04x.\n", 684 dev->name, csr0, DREG )); 685 686 if (csr0 & CSR0_TINT) { /* Tx-done interrupt */ 687 int old_tx = lp->old_tx; 688 689 // if(lance_debug >= 3) { 690 // int i; 691 // 692 // printk("%s: tx int\n", dev->name); 693 // 694 // for(i = 0; i < TX_RING_SIZE; i++) 695 // printk("ring %d flag=%04x\n", i, 696 // MEM->tx_head[i].flag); 697 // } 698 699 while( old_tx != lp->new_tx) { 700 struct lance_tx_head *head = &(MEM->tx_head[old_tx]); 701 702 DPRINTK(3, ("on tx_ring %d\n", old_tx)); 703 704 if (head->flag & TMD1_OWN_CHIP) 705 break; /* It still hasn't been Txed */ 706 707 if (head->flag & TMD1_ERR) { 708 int status = head->misc; 709 dev->stats.tx_errors++; 710 if (status & TMD3_RTRY) dev->stats.tx_aborted_errors++; 711 if (status & TMD3_LCAR) dev->stats.tx_carrier_errors++; 712 if (status & TMD3_LCOL) dev->stats.tx_window_errors++; 713 if (status & (TMD3_UFLO | TMD3_BUFF)) { 714 dev->stats.tx_fifo_errors++; 715 printk("%s: Tx FIFO error\n", 716 dev->name); 717 REGA(CSR0) = CSR0_STOP; 718 REGA(CSR3) = CSR3_BSWP; 719 lance_init_ring(dev); 720 REGA(CSR0) = CSR0_STRT | CSR0_INEA; 721 return IRQ_HANDLED; 722 } 723 } else if(head->flag & (TMD1_ENP | TMD1_STP)) { 724 725 head->flag &= ~(TMD1_ENP | TMD1_STP); 726 if(head->flag & (TMD1_ONE | TMD1_MORE)) 727 dev->stats.collisions++; 728 729 dev->stats.tx_packets++; 730 DPRINTK(3, ("cleared tx ring %d\n", old_tx)); 731 } 732 old_tx = (old_tx +1) & TX_RING_MOD_MASK; 733 } 734 735 lp->old_tx = old_tx; 736 } 737 738 739 if (netif_queue_stopped(dev)) { 740 /* The ring is no longer full, clear tbusy. */ 741 netif_start_queue(dev); 742 netif_wake_queue(dev); 743 } 744 745 if (csr0 & CSR0_RINT) /* Rx interrupt */ 746 lance_rx( dev ); 747 748 /* Log misc errors. */ 749 if (csr0 & CSR0_BABL) dev->stats.tx_errors++; /* Tx babble. */ 750 if (csr0 & CSR0_MISS) dev->stats.rx_errors++; /* Missed a Rx frame. */ 751 if (csr0 & CSR0_MERR) { 752 DPRINTK( 1, ( "%s: Bus master arbitration failure (?!?), " 753 "status %04x.\n", dev->name, csr0 )); 754 /* Restart the chip. */ 755 REGA(CSR0) = CSR0_STOP; 756 REGA(CSR3) = CSR3_BSWP; 757 lance_init_ring(dev); 758 REGA(CSR0) = CSR0_STRT | CSR0_INEA; 759 } 760 761 762 /* Clear any other interrupt, and set interrupt enable. */ 763 // DREG = CSR0_BABL | CSR0_CERR | CSR0_MISS | CSR0_MERR | 764 // CSR0_IDON | CSR0_INEA; 765 766 REGA(CSR0) = CSR0_INEA; 767 768 if(DREG & (CSR0_RINT | CSR0_TINT)) { 769 DPRINTK(2, ("restarting interrupt, csr0=%#04x\n", DREG)); 770 goto still_more; 771 } 772 773 DPRINTK( 2, ( "%s: exiting interrupt, csr0=%#04x.\n", 774 dev->name, DREG )); 775 in_interrupt = 0; 776 return IRQ_HANDLED; 777 } 778 779 /* get packet, toss into skbuff */ 780 static int lance_rx( struct net_device *dev ) 781 { 782 struct lance_private *lp = netdev_priv(dev); 783 int entry = lp->new_rx; 784 785 /* If we own the next entry, it's a new packet. Send it up. */ 786 while( (MEM->rx_head[entry].flag & RMD1_OWN) == RMD1_OWN_HOST ) { 787 struct lance_rx_head *head = &(MEM->rx_head[entry]); 788 int status = head->flag; 789 790 if (status != (RMD1_ENP|RMD1_STP)) { /* There was an error. */ 791 /* There is a tricky error noted by John Murphy, 792 <murf@perftech.com> to Russ Nelson: Even with 793 full-sized buffers it's possible for a jabber packet to use two 794 buffers, with only the last correctly noting the error. */ 795 if (status & RMD1_ENP) /* Only count a general error at the */ 796 dev->stats.rx_errors++; /* end of a packet.*/ 797 if (status & RMD1_FRAM) dev->stats.rx_frame_errors++; 798 if (status & RMD1_OFLO) dev->stats.rx_over_errors++; 799 if (status & RMD1_CRC) dev->stats.rx_crc_errors++; 800 if (status & RMD1_BUFF) dev->stats.rx_fifo_errors++; 801 head->flag &= (RMD1_ENP|RMD1_STP); 802 } else { 803 /* Malloc up new buffer, compatible with net-3. */ 804 // short pkt_len = head->msg_length;// & 0xfff; 805 short pkt_len = (head->msg_length & 0xfff) - 4; 806 struct sk_buff *skb; 807 808 if (pkt_len < 60) { 809 printk( "%s: Runt packet!\n", dev->name ); 810 dev->stats.rx_errors++; 811 } 812 else { 813 skb = dev_alloc_skb( pkt_len+2 ); 814 if (skb == NULL) { 815 DPRINTK( 1, ( "%s: Memory squeeze, deferring packet.\n", 816 dev->name )); 817 818 dev->stats.rx_dropped++; 819 head->msg_length = 0; 820 head->flag |= RMD1_OWN_CHIP; 821 lp->new_rx = (lp->new_rx+1) & 822 RX_RING_MOD_MASK; 823 } 824 825 #if 0 826 if (lance_debug >= 3) { 827 u_char *data = PKTBUF_ADDR(head); 828 printk("%s: RX pkt %d type 0x%04x" 829 " from %pM to %pM", 830 dev->name, lp->new_tx, ((u_short *)data)[6], 831 &data[6], data); 832 833 printk(" data %02x %02x %02x %02x %02x %02x %02x %02x " 834 "len %d at %08x\n", 835 data[15], data[16], data[17], data[18], 836 data[19], data[20], data[21], data[22], 837 pkt_len, data); 838 } 839 #endif 840 if (lance_debug >= 3) { 841 u_char *data = PKTBUF_ADDR(head); 842 printk( "%s: RX pkt %d type 0x%04x len %d\n ", dev->name, entry, ((u_short *)data)[6], pkt_len); 843 } 844 845 846 skb_reserve( skb, 2 ); /* 16 byte align */ 847 skb_put( skb, pkt_len ); /* Make room */ 848 skb_copy_to_linear_data(skb, 849 PKTBUF_ADDR(head), 850 pkt_len); 851 852 skb->protocol = eth_type_trans( skb, dev ); 853 netif_rx( skb ); 854 dev->stats.rx_packets++; 855 dev->stats.rx_bytes += pkt_len; 856 } 857 } 858 859 // head->buf_length = -PKT_BUF_SZ | 0xf000; 860 head->msg_length = 0; 861 head->flag = RMD1_OWN_CHIP; 862 863 entry = lp->new_rx = (lp->new_rx +1) & RX_RING_MOD_MASK; 864 } 865 866 /* From lance.c (Donald Becker): */ 867 /* We should check that at least two ring entries are free. 868 If not, we should free one and mark stats->rx_dropped++. */ 869 870 return 0; 871 } 872 873 874 static int lance_close( struct net_device *dev ) 875 { 876 struct lance_private *lp = netdev_priv(dev); 877 878 netif_stop_queue(dev); 879 880 AREG = CSR0; 881 882 DPRINTK( 2, ( "%s: Shutting down ethercard, status was %2.2x.\n", 883 dev->name, DREG )); 884 885 /* We stop the LANCE here -- it occasionally polls 886 memory if we don't. */ 887 DREG = CSR0_STOP; 888 return 0; 889 } 890 891 892 /* Set or clear the multicast filter for this adaptor. 893 num_addrs == -1 Promiscuous mode, receive all packets 894 num_addrs == 0 Normal mode, clear multicast list 895 num_addrs > 0 Multicast mode, receive normal and MC packets, and do 896 best-effort filtering. 897 */ 898 899 /* completely untested on a sun3 */ 900 static void set_multicast_list( struct net_device *dev ) 901 { 902 struct lance_private *lp = netdev_priv(dev); 903 904 if(netif_queue_stopped(dev)) 905 /* Only possible if board is already started */ 906 return; 907 908 /* We take the simple way out and always enable promiscuous mode. */ 909 DREG = CSR0_STOP; /* Temporarily stop the lance. */ 910 911 if (dev->flags & IFF_PROMISC) { 912 /* Log any net taps. */ 913 DPRINTK( 3, ( "%s: Promiscuous mode enabled.\n", dev->name )); 914 REGA( CSR15 ) = 0x8000; /* Set promiscuous mode */ 915 } else { 916 short multicast_table[4]; 917 int num_addrs = netdev_mc_count(dev); 918 int i; 919 /* We don't use the multicast table, but rely on upper-layer 920 * filtering. */ 921 memset( multicast_table, (num_addrs == 0) ? 0 : -1, 922 sizeof(multicast_table) ); 923 for( i = 0; i < 4; i++ ) 924 REGA( CSR8+i ) = multicast_table[i]; 925 REGA( CSR15 ) = 0; /* Unset promiscuous mode */ 926 } 927 928 /* 929 * Always set BSWP after a STOP as STOP puts it back into 930 * little endian mode. 931 */ 932 REGA( CSR3 ) = CSR3_BSWP; 933 934 /* Resume normal operation and reset AREG to CSR0 */ 935 REGA( CSR0 ) = CSR0_IDON | CSR0_INEA | CSR0_STRT; 936 } 937 938 939 #ifdef MODULE 940 941 static struct net_device *sun3lance_dev; 942 943 int __init init_module(void) 944 { 945 sun3lance_dev = sun3lance_probe(-1); 946 if (IS_ERR(sun3lance_dev)) 947 return PTR_ERR(sun3lance_dev); 948 return 0; 949 } 950 951 void __exit cleanup_module(void) 952 { 953 unregister_netdev(sun3lance_dev); 954 #ifdef CONFIG_SUN3 955 iounmap((void __iomem *)sun3lance_dev->base_addr); 956 #endif 957 free_netdev(sun3lance_dev); 958 } 959 960 #endif /* MODULE */ 961 962