1 /* 8390.c: A general NS8390 ethernet driver core for linux. */ 2 /* 3 Written 1992-94 by Donald Becker. 4 5 Copyright 1993 United States Government as represented by the 6 Director, National Security Agency. 7 8 This software may be used and distributed according to the terms 9 of the GNU General Public License, incorporated herein by reference. 10 11 The author may be reached as becker@scyld.com, or C/O 12 Scyld Computing Corporation 13 410 Severn Ave., Suite 210 14 Annapolis MD 21403 15 16 17 This is the chip-specific code for many 8390-based ethernet adaptors. 18 This is not a complete driver, it must be combined with board-specific 19 code such as ne.c, wd.c, 3c503.c, etc. 20 21 Seeing how at least eight drivers use this code, (not counting the 22 PCMCIA ones either) it is easy to break some card by what seems like 23 a simple innocent change. Please contact me or Donald if you think 24 you have found something that needs changing. -- PG 25 26 27 Changelog: 28 29 Paul Gortmaker : remove set_bit lock, other cleanups. 30 Paul Gortmaker : add ei_get_8390_hdr() so we can pass skb's to 31 ei_block_input() for eth_io_copy_and_sum(). 32 Paul Gortmaker : exchange static int ei_pingpong for a #define, 33 also add better Tx error handling. 34 Paul Gortmaker : rewrite Rx overrun handling as per NS specs. 35 Alexey Kuznetsov : use the 8390's six bit hash multicast filter. 36 Paul Gortmaker : tweak ANK's above multicast changes a bit. 37 Paul Gortmaker : update packet statistics for v2.1.x 38 Alan Cox : support arbitrary stupid port mappings on the 39 68K Macintosh. Support >16bit I/O spaces 40 Paul Gortmaker : add kmod support for auto-loading of the 8390 41 module by all drivers that require it. 42 Alan Cox : Spinlocking work, added 'BUG_83C690' 43 Paul Gortmaker : Separate out Tx timeout code from Tx path. 44 Paul Gortmaker : Remove old unused single Tx buffer code. 45 Hayato Fujiwara : Add m32r support. 46 Paul Gortmaker : use skb_padto() instead of stack scratch area 47 48 Sources: 49 The National Semiconductor LAN Databook, and the 3Com 3c503 databook. 50 51 */ 52 53 #include <linux/module.h> 54 #include <linux/kernel.h> 55 #include <linux/jiffies.h> 56 #include <linux/fs.h> 57 #include <linux/types.h> 58 #include <linux/string.h> 59 #include <linux/bitops.h> 60 #include <linux/uaccess.h> 61 #include <linux/io.h> 62 #include <asm/irq.h> 63 #include <linux/delay.h> 64 #include <linux/errno.h> 65 #include <linux/fcntl.h> 66 #include <linux/in.h> 67 #include <linux/interrupt.h> 68 #include <linux/init.h> 69 #include <linux/crc32.h> 70 71 #include <linux/netdevice.h> 72 #include <linux/etherdevice.h> 73 74 #define NS8390_CORE 75 #include "8390.h" 76 77 #define BUG_83C690 78 79 /* These are the operational function interfaces to board-specific 80 routines. 81 void reset_8390(struct net_device *dev) 82 Resets the board associated with DEV, including a hardware reset of 83 the 8390. This is only called when there is a transmit timeout, and 84 it is always followed by 8390_init(). 85 void block_output(struct net_device *dev, int count, const unsigned char *buf, 86 int start_page) 87 Write the COUNT bytes of BUF to the packet buffer at START_PAGE. The 88 "page" value uses the 8390's 256-byte pages. 89 void get_8390_hdr(struct net_device *dev, struct e8390_hdr *hdr, int ring_page) 90 Read the 4 byte, page aligned 8390 header. *If* there is a 91 subsequent read, it will be of the rest of the packet. 92 void block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset) 93 Read COUNT bytes from the packet buffer into the skb data area. Start 94 reading from RING_OFFSET, the address as the 8390 sees it. This will always 95 follow the read of the 8390 header. 96 */ 97 #define ei_reset_8390 (ei_local->reset_8390) 98 #define ei_block_output (ei_local->block_output) 99 #define ei_block_input (ei_local->block_input) 100 #define ei_get_8390_hdr (ei_local->get_8390_hdr) 101 102 /* Index to functions. */ 103 static void ei_tx_intr(struct net_device *dev); 104 static void ei_tx_err(struct net_device *dev); 105 static void ei_receive(struct net_device *dev); 106 static void ei_rx_overrun(struct net_device *dev); 107 108 /* Routines generic to NS8390-based boards. */ 109 static void NS8390_trigger_send(struct net_device *dev, unsigned int length, 110 int start_page); 111 static void do_set_multicast_list(struct net_device *dev); 112 static void __NS8390_init(struct net_device *dev, int startp); 113 114 static unsigned version_printed; 115 static u32 msg_enable; 116 module_param(msg_enable, uint, 0444); 117 MODULE_PARM_DESC(msg_enable, "Debug message level (see linux/netdevice.h for bitmap)"); 118 119 /* 120 * SMP and the 8390 setup. 121 * 122 * The 8390 isn't exactly designed to be multithreaded on RX/TX. There is 123 * a page register that controls bank and packet buffer access. We guard 124 * this with ei_local->page_lock. Nobody should assume or set the page other 125 * than zero when the lock is not held. Lock holders must restore page 0 126 * before unlocking. Even pure readers must take the lock to protect in 127 * page 0. 128 * 129 * To make life difficult the chip can also be very slow. We therefore can't 130 * just use spinlocks. For the longer lockups we disable the irq the device 131 * sits on and hold the lock. We must hold the lock because there is a dual 132 * processor case other than interrupts (get stats/set multicast list in 133 * parallel with each other and transmit). 134 * 135 * Note: in theory we can just disable the irq on the card _but_ there is 136 * a latency on SMP irq delivery. So we can easily go "disable irq" "sync irqs" 137 * enter lock, take the queued irq. So we waddle instead of flying. 138 * 139 * Finally by special arrangement for the purpose of being generally 140 * annoying the transmit function is called bh atomic. That places 141 * restrictions on the user context callers as disable_irq won't save 142 * them. 143 * 144 * Additional explanation of problems with locking by Alan Cox: 145 * 146 * "The author (me) didn't use spin_lock_irqsave because the slowness of the 147 * card means that approach caused horrible problems like losing serial data 148 * at 38400 baud on some chips. Remember many 8390 nics on PCI were ISA 149 * chips with FPGA front ends. 150 * 151 * Ok the logic behind the 8390 is very simple: 152 * 153 * Things to know 154 * - IRQ delivery is asynchronous to the PCI bus 155 * - Blocking the local CPU IRQ via spin locks was too slow 156 * - The chip has register windows needing locking work 157 * 158 * So the path was once (I say once as people appear to have changed it 159 * in the mean time and it now looks rather bogus if the changes to use 160 * disable_irq_nosync_irqsave are disabling the local IRQ) 161 * 162 * 163 * Take the page lock 164 * Mask the IRQ on chip 165 * Disable the IRQ (but not mask locally- someone seems to have 166 * broken this with the lock validator stuff) 167 * [This must be _nosync as the page lock may otherwise 168 * deadlock us] 169 * Drop the page lock and turn IRQs back on 170 * 171 * At this point an existing IRQ may still be running but we can't 172 * get a new one 173 * 174 * Take the lock (so we know the IRQ has terminated) but don't mask 175 * the IRQs on the processor 176 * Set irqlock [for debug] 177 * 178 * Transmit (slow as ****) 179 * 180 * re-enable the IRQ 181 * 182 * 183 * We have to use disable_irq because otherwise you will get delayed 184 * interrupts on the APIC bus deadlocking the transmit path. 185 * 186 * Quite hairy but the chip simply wasn't designed for SMP and you can't 187 * even ACK an interrupt without risking corrupting other parallel 188 * activities on the chip." [lkml, 25 Jul 2007] 189 */ 190 191 192 193 /** 194 * ei_open - Open/initialize the board. 195 * @dev: network device to initialize 196 * 197 * This routine goes all-out, setting everything 198 * up anew at each open, even though many of these registers should only 199 * need to be set once at boot. 200 */ 201 static int __ei_open(struct net_device *dev) 202 { 203 unsigned long flags; 204 struct ei_device *ei_local = netdev_priv(dev); 205 206 if (dev->watchdog_timeo <= 0) 207 dev->watchdog_timeo = TX_TIMEOUT; 208 209 /* 210 * Grab the page lock so we own the register set, then call 211 * the init function. 212 */ 213 214 spin_lock_irqsave(&ei_local->page_lock, flags); 215 __NS8390_init(dev, 1); 216 /* Set the flag before we drop the lock, That way the IRQ arrives 217 after its set and we get no silly warnings */ 218 netif_start_queue(dev); 219 spin_unlock_irqrestore(&ei_local->page_lock, flags); 220 ei_local->irqlock = 0; 221 return 0; 222 } 223 224 /** 225 * ei_close - shut down network device 226 * @dev: network device to close 227 * 228 * Opposite of ei_open(). Only used when "ifconfig <devname> down" is done. 229 */ 230 static int __ei_close(struct net_device *dev) 231 { 232 struct ei_device *ei_local = netdev_priv(dev); 233 unsigned long flags; 234 235 /* 236 * Hold the page lock during close 237 */ 238 239 spin_lock_irqsave(&ei_local->page_lock, flags); 240 __NS8390_init(dev, 0); 241 spin_unlock_irqrestore(&ei_local->page_lock, flags); 242 netif_stop_queue(dev); 243 return 0; 244 } 245 246 /** 247 * ei_tx_timeout - handle transmit time out condition 248 * @dev: network device which has apparently fallen asleep 249 * 250 * Called by kernel when device never acknowledges a transmit has 251 * completed (or failed) - i.e. never posted a Tx related interrupt. 252 */ 253 254 static void __ei_tx_timeout(struct net_device *dev, unsigned int txqueue) 255 { 256 unsigned long e8390_base = dev->base_addr; 257 struct ei_device *ei_local = netdev_priv(dev); 258 int txsr, isr, tickssofar = jiffies - dev_trans_start(dev); 259 unsigned long flags; 260 261 dev->stats.tx_errors++; 262 263 spin_lock_irqsave(&ei_local->page_lock, flags); 264 txsr = ei_inb(e8390_base+EN0_TSR); 265 isr = ei_inb(e8390_base+EN0_ISR); 266 spin_unlock_irqrestore(&ei_local->page_lock, flags); 267 268 netdev_dbg(dev, "Tx timed out, %s TSR=%#2x, ISR=%#2x, t=%d\n", 269 (txsr & ENTSR_ABT) ? "excess collisions." : 270 (isr) ? "lost interrupt?" : "cable problem?", 271 txsr, isr, tickssofar); 272 273 if (!isr && !dev->stats.tx_packets) { 274 /* The 8390 probably hasn't gotten on the cable yet. */ 275 ei_local->interface_num ^= 1; /* Try a different xcvr. */ 276 } 277 278 /* Ugly but a reset can be slow, yet must be protected */ 279 280 disable_irq_nosync_lockdep(dev->irq); 281 spin_lock(&ei_local->page_lock); 282 283 /* Try to restart the card. Perhaps the user has fixed something. */ 284 ei_reset_8390(dev); 285 __NS8390_init(dev, 1); 286 287 spin_unlock(&ei_local->page_lock); 288 enable_irq_lockdep(dev->irq); 289 netif_wake_queue(dev); 290 } 291 292 /** 293 * ei_start_xmit - begin packet transmission 294 * @skb: packet to be sent 295 * @dev: network device to which packet is sent 296 * 297 * Sends a packet to an 8390 network device. 298 */ 299 300 static netdev_tx_t __ei_start_xmit(struct sk_buff *skb, 301 struct net_device *dev) 302 { 303 unsigned long e8390_base = dev->base_addr; 304 struct ei_device *ei_local = netdev_priv(dev); 305 int send_length = skb->len, output_page; 306 unsigned long flags; 307 char buf[ETH_ZLEN]; 308 char *data = skb->data; 309 310 if (skb->len < ETH_ZLEN) { 311 memset(buf, 0, ETH_ZLEN); /* more efficient than doing just the needed bits */ 312 memcpy(buf, data, skb->len); 313 send_length = ETH_ZLEN; 314 data = buf; 315 } 316 317 /* Mask interrupts from the ethercard. 318 SMP: We have to grab the lock here otherwise the IRQ handler 319 on another CPU can flip window and race the IRQ mask set. We end 320 up trashing the mcast filter not disabling irqs if we don't lock */ 321 322 spin_lock_irqsave(&ei_local->page_lock, flags); 323 ei_outb_p(0x00, e8390_base + EN0_IMR); 324 spin_unlock_irqrestore(&ei_local->page_lock, flags); 325 326 327 /* 328 * Slow phase with lock held. 329 */ 330 331 disable_irq_nosync_lockdep_irqsave(dev->irq, &flags); 332 333 spin_lock(&ei_local->page_lock); 334 335 ei_local->irqlock = 1; 336 337 /* 338 * We have two Tx slots available for use. Find the first free 339 * slot, and then perform some sanity checks. With two Tx bufs, 340 * you get very close to transmitting back-to-back packets. With 341 * only one Tx buf, the transmitter sits idle while you reload the 342 * card, leaving a substantial gap between each transmitted packet. 343 */ 344 345 if (ei_local->tx1 == 0) { 346 output_page = ei_local->tx_start_page; 347 ei_local->tx1 = send_length; 348 if ((netif_msg_tx_queued(ei_local)) && 349 ei_local->tx2 > 0) 350 netdev_dbg(dev, 351 "idle transmitter tx2=%d, lasttx=%d, txing=%d\n", 352 ei_local->tx2, ei_local->lasttx, ei_local->txing); 353 } else if (ei_local->tx2 == 0) { 354 output_page = ei_local->tx_start_page + TX_PAGES/2; 355 ei_local->tx2 = send_length; 356 if ((netif_msg_tx_queued(ei_local)) && 357 ei_local->tx1 > 0) 358 netdev_dbg(dev, 359 "idle transmitter, tx1=%d, lasttx=%d, txing=%d\n", 360 ei_local->tx1, ei_local->lasttx, ei_local->txing); 361 } else { /* We should never get here. */ 362 netif_dbg(ei_local, tx_err, dev, 363 "No Tx buffers free! tx1=%d tx2=%d last=%d\n", 364 ei_local->tx1, ei_local->tx2, ei_local->lasttx); 365 ei_local->irqlock = 0; 366 netif_stop_queue(dev); 367 ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR); 368 spin_unlock(&ei_local->page_lock); 369 enable_irq_lockdep_irqrestore(dev->irq, &flags); 370 dev->stats.tx_errors++; 371 return NETDEV_TX_BUSY; 372 } 373 374 /* 375 * Okay, now upload the packet and trigger a send if the transmitter 376 * isn't already sending. If it is busy, the interrupt handler will 377 * trigger the send later, upon receiving a Tx done interrupt. 378 */ 379 380 ei_block_output(dev, send_length, data, output_page); 381 382 if (!ei_local->txing) { 383 ei_local->txing = 1; 384 NS8390_trigger_send(dev, send_length, output_page); 385 if (output_page == ei_local->tx_start_page) { 386 ei_local->tx1 = -1; 387 ei_local->lasttx = -1; 388 } else { 389 ei_local->tx2 = -1; 390 ei_local->lasttx = -2; 391 } 392 } else 393 ei_local->txqueue++; 394 395 if (ei_local->tx1 && ei_local->tx2) 396 netif_stop_queue(dev); 397 else 398 netif_start_queue(dev); 399 400 /* Turn 8390 interrupts back on. */ 401 ei_local->irqlock = 0; 402 ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR); 403 404 spin_unlock(&ei_local->page_lock); 405 enable_irq_lockdep_irqrestore(dev->irq, &flags); 406 skb_tx_timestamp(skb); 407 dev_consume_skb_any(skb); 408 dev->stats.tx_bytes += send_length; 409 410 return NETDEV_TX_OK; 411 } 412 413 /** 414 * ei_interrupt - handle the interrupts from an 8390 415 * @irq: interrupt number 416 * @dev_id: a pointer to the net_device 417 * 418 * Handle the ether interface interrupts. We pull packets from 419 * the 8390 via the card specific functions and fire them at the networking 420 * stack. We also handle transmit completions and wake the transmit path if 421 * necessary. We also update the counters and do other housekeeping as 422 * needed. 423 */ 424 425 static irqreturn_t __ei_interrupt(int irq, void *dev_id) 426 { 427 struct net_device *dev = dev_id; 428 unsigned long e8390_base = dev->base_addr; 429 int interrupts, nr_serviced = 0; 430 struct ei_device *ei_local = netdev_priv(dev); 431 432 /* 433 * Protect the irq test too. 434 */ 435 436 spin_lock(&ei_local->page_lock); 437 438 if (ei_local->irqlock) { 439 /* 440 * This might just be an interrupt for a PCI device sharing 441 * this line 442 */ 443 netdev_err(dev, "Interrupted while interrupts are masked! isr=%#2x imr=%#2x\n", 444 ei_inb_p(e8390_base + EN0_ISR), 445 ei_inb_p(e8390_base + EN0_IMR)); 446 spin_unlock(&ei_local->page_lock); 447 return IRQ_NONE; 448 } 449 450 /* Change to page 0 and read the intr status reg. */ 451 ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD); 452 netif_dbg(ei_local, intr, dev, "interrupt(isr=%#2.2x)\n", 453 ei_inb_p(e8390_base + EN0_ISR)); 454 455 /* !!Assumption!! -- we stay in page 0. Don't break this. */ 456 while ((interrupts = ei_inb_p(e8390_base + EN0_ISR)) != 0 && 457 ++nr_serviced < MAX_SERVICE) { 458 if (!netif_running(dev)) { 459 netdev_warn(dev, "interrupt from stopped card\n"); 460 /* rmk - acknowledge the interrupts */ 461 ei_outb_p(interrupts, e8390_base + EN0_ISR); 462 interrupts = 0; 463 break; 464 } 465 if (interrupts & ENISR_OVER) 466 ei_rx_overrun(dev); 467 else if (interrupts & (ENISR_RX+ENISR_RX_ERR)) { 468 /* Got a good (?) packet. */ 469 ei_receive(dev); 470 } 471 /* Push the next to-transmit packet through. */ 472 if (interrupts & ENISR_TX) 473 ei_tx_intr(dev); 474 else if (interrupts & ENISR_TX_ERR) 475 ei_tx_err(dev); 476 477 if (interrupts & ENISR_COUNTERS) { 478 dev->stats.rx_frame_errors += ei_inb_p(e8390_base + EN0_COUNTER0); 479 dev->stats.rx_crc_errors += ei_inb_p(e8390_base + EN0_COUNTER1); 480 dev->stats.rx_missed_errors += ei_inb_p(e8390_base + EN0_COUNTER2); 481 ei_outb_p(ENISR_COUNTERS, e8390_base + EN0_ISR); /* Ack intr. */ 482 } 483 484 /* Ignore any RDC interrupts that make it back to here. */ 485 if (interrupts & ENISR_RDC) 486 ei_outb_p(ENISR_RDC, e8390_base + EN0_ISR); 487 488 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD); 489 } 490 491 if (interrupts && (netif_msg_intr(ei_local))) { 492 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD); 493 if (nr_serviced >= MAX_SERVICE) { 494 /* 0xFF is valid for a card removal */ 495 if (interrupts != 0xFF) 496 netdev_warn(dev, "Too much work at interrupt, status %#2.2x\n", 497 interrupts); 498 ei_outb_p(ENISR_ALL, e8390_base + EN0_ISR); /* Ack. most intrs. */ 499 } else { 500 netdev_warn(dev, "unknown interrupt %#2x\n", interrupts); 501 ei_outb_p(0xff, e8390_base + EN0_ISR); /* Ack. all intrs. */ 502 } 503 } 504 spin_unlock(&ei_local->page_lock); 505 return IRQ_RETVAL(nr_serviced > 0); 506 } 507 508 #ifdef CONFIG_NET_POLL_CONTROLLER 509 static void __ei_poll(struct net_device *dev) 510 { 511 disable_irq(dev->irq); 512 __ei_interrupt(dev->irq, dev); 513 enable_irq(dev->irq); 514 } 515 #endif 516 517 /** 518 * ei_tx_err - handle transmitter error 519 * @dev: network device which threw the exception 520 * 521 * A transmitter error has happened. Most likely excess collisions (which 522 * is a fairly normal condition). If the error is one where the Tx will 523 * have been aborted, we try and send another one right away, instead of 524 * letting the failed packet sit and collect dust in the Tx buffer. This 525 * is a much better solution as it avoids kernel based Tx timeouts, and 526 * an unnecessary card reset. 527 * 528 * Called with lock held. 529 */ 530 531 static void ei_tx_err(struct net_device *dev) 532 { 533 unsigned long e8390_base = dev->base_addr; 534 /* ei_local is used on some platforms via the EI_SHIFT macro */ 535 struct ei_device *ei_local __maybe_unused = netdev_priv(dev); 536 unsigned char txsr = ei_inb_p(e8390_base+EN0_TSR); 537 unsigned char tx_was_aborted = txsr & (ENTSR_ABT+ENTSR_FU); 538 539 #ifdef VERBOSE_ERROR_DUMP 540 netdev_dbg(dev, "transmitter error (%#2x):", txsr); 541 if (txsr & ENTSR_ABT) 542 pr_cont(" excess-collisions "); 543 if (txsr & ENTSR_ND) 544 pr_cont(" non-deferral "); 545 if (txsr & ENTSR_CRS) 546 pr_cont(" lost-carrier "); 547 if (txsr & ENTSR_FU) 548 pr_cont(" FIFO-underrun "); 549 if (txsr & ENTSR_CDH) 550 pr_cont(" lost-heartbeat "); 551 pr_cont("\n"); 552 #endif 553 554 ei_outb_p(ENISR_TX_ERR, e8390_base + EN0_ISR); /* Ack intr. */ 555 556 if (tx_was_aborted) 557 ei_tx_intr(dev); 558 else { 559 dev->stats.tx_errors++; 560 if (txsr & ENTSR_CRS) 561 dev->stats.tx_carrier_errors++; 562 if (txsr & ENTSR_CDH) 563 dev->stats.tx_heartbeat_errors++; 564 if (txsr & ENTSR_OWC) 565 dev->stats.tx_window_errors++; 566 } 567 } 568 569 /** 570 * ei_tx_intr - transmit interrupt handler 571 * @dev: network device for which tx intr is handled 572 * 573 * We have finished a transmit: check for errors and then trigger the next 574 * packet to be sent. Called with lock held. 575 */ 576 577 static void ei_tx_intr(struct net_device *dev) 578 { 579 unsigned long e8390_base = dev->base_addr; 580 struct ei_device *ei_local = netdev_priv(dev); 581 int status = ei_inb(e8390_base + EN0_TSR); 582 583 ei_outb_p(ENISR_TX, e8390_base + EN0_ISR); /* Ack intr. */ 584 585 /* 586 * There are two Tx buffers, see which one finished, and trigger 587 * the send of another one if it exists. 588 */ 589 ei_local->txqueue--; 590 591 if (ei_local->tx1 < 0) { 592 if (ei_local->lasttx != 1 && ei_local->lasttx != -1) 593 pr_err("%s: bogus last_tx_buffer %d, tx1=%d\n", 594 ei_local->name, ei_local->lasttx, ei_local->tx1); 595 ei_local->tx1 = 0; 596 if (ei_local->tx2 > 0) { 597 ei_local->txing = 1; 598 NS8390_trigger_send(dev, ei_local->tx2, ei_local->tx_start_page + 6); 599 netif_trans_update(dev); 600 ei_local->tx2 = -1, 601 ei_local->lasttx = 2; 602 } else 603 ei_local->lasttx = 20, ei_local->txing = 0; 604 } else if (ei_local->tx2 < 0) { 605 if (ei_local->lasttx != 2 && ei_local->lasttx != -2) 606 pr_err("%s: bogus last_tx_buffer %d, tx2=%d\n", 607 ei_local->name, ei_local->lasttx, ei_local->tx2); 608 ei_local->tx2 = 0; 609 if (ei_local->tx1 > 0) { 610 ei_local->txing = 1; 611 NS8390_trigger_send(dev, ei_local->tx1, ei_local->tx_start_page); 612 netif_trans_update(dev); 613 ei_local->tx1 = -1; 614 ei_local->lasttx = 1; 615 } else 616 ei_local->lasttx = 10, ei_local->txing = 0; 617 } /* else 618 netdev_warn(dev, "unexpected TX-done interrupt, lasttx=%d\n", 619 ei_local->lasttx); 620 */ 621 622 /* Minimize Tx latency: update the statistics after we restart TXing. */ 623 if (status & ENTSR_COL) 624 dev->stats.collisions++; 625 if (status & ENTSR_PTX) 626 dev->stats.tx_packets++; 627 else { 628 dev->stats.tx_errors++; 629 if (status & ENTSR_ABT) { 630 dev->stats.tx_aborted_errors++; 631 dev->stats.collisions += 16; 632 } 633 if (status & ENTSR_CRS) 634 dev->stats.tx_carrier_errors++; 635 if (status & ENTSR_FU) 636 dev->stats.tx_fifo_errors++; 637 if (status & ENTSR_CDH) 638 dev->stats.tx_heartbeat_errors++; 639 if (status & ENTSR_OWC) 640 dev->stats.tx_window_errors++; 641 } 642 netif_wake_queue(dev); 643 } 644 645 /** 646 * ei_receive - receive some packets 647 * @dev: network device with which receive will be run 648 * 649 * We have a good packet(s), get it/them out of the buffers. 650 * Called with lock held. 651 */ 652 653 static void ei_receive(struct net_device *dev) 654 { 655 unsigned long e8390_base = dev->base_addr; 656 struct ei_device *ei_local = netdev_priv(dev); 657 unsigned char rxing_page, this_frame, next_frame; 658 unsigned short current_offset; 659 int rx_pkt_count = 0; 660 struct e8390_pkt_hdr rx_frame; 661 int num_rx_pages = ei_local->stop_page-ei_local->rx_start_page; 662 663 while (++rx_pkt_count < 10) { 664 int pkt_len, pkt_stat; 665 666 /* Get the rx page (incoming packet pointer). */ 667 ei_outb_p(E8390_NODMA+E8390_PAGE1, e8390_base + E8390_CMD); 668 rxing_page = ei_inb_p(e8390_base + EN1_CURPAG); 669 ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD); 670 671 /* Remove one frame from the ring. Boundary is always a page behind. */ 672 this_frame = ei_inb_p(e8390_base + EN0_BOUNDARY) + 1; 673 if (this_frame >= ei_local->stop_page) 674 this_frame = ei_local->rx_start_page; 675 676 /* Someday we'll omit the previous, iff we never get this message. 677 (There is at least one clone claimed to have a problem.) 678 679 Keep quiet if it looks like a card removal. One problem here 680 is that some clones crash in roughly the same way. 681 */ 682 if ((netif_msg_rx_status(ei_local)) && 683 this_frame != ei_local->current_page && 684 (this_frame != 0x0 || rxing_page != 0xFF)) 685 netdev_err(dev, 686 "mismatched read page pointers %2x vs %2x\n", 687 this_frame, ei_local->current_page); 688 689 if (this_frame == rxing_page) /* Read all the frames? */ 690 break; /* Done for now */ 691 692 current_offset = this_frame << 8; 693 ei_get_8390_hdr(dev, &rx_frame, this_frame); 694 695 pkt_len = rx_frame.count - sizeof(struct e8390_pkt_hdr); 696 pkt_stat = rx_frame.status; 697 698 next_frame = this_frame + 1 + ((pkt_len+4)>>8); 699 700 /* Check for bogosity warned by 3c503 book: the status byte is never 701 written. This happened a lot during testing! This code should be 702 cleaned up someday. */ 703 if (rx_frame.next != next_frame && 704 rx_frame.next != next_frame + 1 && 705 rx_frame.next != next_frame - num_rx_pages && 706 rx_frame.next != next_frame + 1 - num_rx_pages) { 707 ei_local->current_page = rxing_page; 708 ei_outb(ei_local->current_page-1, e8390_base+EN0_BOUNDARY); 709 dev->stats.rx_errors++; 710 continue; 711 } 712 713 if (pkt_len < 60 || pkt_len > 1518) { 714 netif_dbg(ei_local, rx_status, dev, 715 "bogus packet size: %d, status=%#2x nxpg=%#2x\n", 716 rx_frame.count, rx_frame.status, 717 rx_frame.next); 718 dev->stats.rx_errors++; 719 dev->stats.rx_length_errors++; 720 } else if ((pkt_stat & 0x0F) == ENRSR_RXOK) { 721 struct sk_buff *skb; 722 723 skb = netdev_alloc_skb(dev, pkt_len + 2); 724 if (skb == NULL) { 725 netif_err(ei_local, rx_err, dev, 726 "Couldn't allocate a sk_buff of size %d\n", 727 pkt_len); 728 dev->stats.rx_dropped++; 729 break; 730 } else { 731 skb_reserve(skb, 2); /* IP headers on 16 byte boundaries */ 732 skb_put(skb, pkt_len); /* Make room */ 733 ei_block_input(dev, pkt_len, skb, current_offset + sizeof(rx_frame)); 734 skb->protocol = eth_type_trans(skb, dev); 735 if (!skb_defer_rx_timestamp(skb)) 736 netif_rx(skb); 737 dev->stats.rx_packets++; 738 dev->stats.rx_bytes += pkt_len; 739 if (pkt_stat & ENRSR_PHY) 740 dev->stats.multicast++; 741 } 742 } else { 743 netif_err(ei_local, rx_err, dev, 744 "bogus packet: status=%#2x nxpg=%#2x size=%d\n", 745 rx_frame.status, rx_frame.next, 746 rx_frame.count); 747 dev->stats.rx_errors++; 748 /* NB: The NIC counts CRC, frame and missed errors. */ 749 if (pkt_stat & ENRSR_FO) 750 dev->stats.rx_fifo_errors++; 751 } 752 next_frame = rx_frame.next; 753 754 /* This _should_ never happen: it's here for avoiding bad clones. */ 755 if (next_frame >= ei_local->stop_page) { 756 netdev_notice(dev, "next frame inconsistency, %#2x\n", 757 next_frame); 758 next_frame = ei_local->rx_start_page; 759 } 760 ei_local->current_page = next_frame; 761 ei_outb_p(next_frame-1, e8390_base+EN0_BOUNDARY); 762 } 763 764 /* We used to also ack ENISR_OVER here, but that would sometimes mask 765 a real overrun, leaving the 8390 in a stopped state with rec'vr off. */ 766 ei_outb_p(ENISR_RX+ENISR_RX_ERR, e8390_base+EN0_ISR); 767 } 768 769 /** 770 * ei_rx_overrun - handle receiver overrun 771 * @dev: network device which threw exception 772 * 773 * We have a receiver overrun: we have to kick the 8390 to get it started 774 * again. Problem is that you have to kick it exactly as NS prescribes in 775 * the updated datasheets, or "the NIC may act in an unpredictable manner." 776 * This includes causing "the NIC to defer indefinitely when it is stopped 777 * on a busy network." Ugh. 778 * Called with lock held. Don't call this with the interrupts off or your 779 * computer will hate you - it takes 10ms or so. 780 */ 781 782 static void ei_rx_overrun(struct net_device *dev) 783 { 784 unsigned long e8390_base = dev->base_addr; 785 unsigned char was_txing, must_resend = 0; 786 /* ei_local is used on some platforms via the EI_SHIFT macro */ 787 struct ei_device *ei_local __maybe_unused = netdev_priv(dev); 788 789 /* 790 * Record whether a Tx was in progress and then issue the 791 * stop command. 792 */ 793 was_txing = ei_inb_p(e8390_base+E8390_CMD) & E8390_TRANS; 794 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); 795 796 netif_dbg(ei_local, rx_err, dev, "Receiver overrun\n"); 797 dev->stats.rx_over_errors++; 798 799 /* 800 * Wait a full Tx time (1.2ms) + some guard time, NS says 1.6ms total. 801 * Early datasheets said to poll the reset bit, but now they say that 802 * it "is not a reliable indicator and subsequently should be ignored." 803 * We wait at least 10ms. 804 */ 805 806 mdelay(10); 807 808 /* 809 * Reset RBCR[01] back to zero as per magic incantation. 810 */ 811 ei_outb_p(0x00, e8390_base+EN0_RCNTLO); 812 ei_outb_p(0x00, e8390_base+EN0_RCNTHI); 813 814 /* 815 * See if any Tx was interrupted or not. According to NS, this 816 * step is vital, and skipping it will cause no end of havoc. 817 */ 818 819 if (was_txing) { 820 unsigned char tx_completed = ei_inb_p(e8390_base+EN0_ISR) & (ENISR_TX+ENISR_TX_ERR); 821 if (!tx_completed) 822 must_resend = 1; 823 } 824 825 /* 826 * Have to enter loopback mode and then restart the NIC before 827 * you are allowed to slurp packets up off the ring. 828 */ 829 ei_outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); 830 ei_outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START, e8390_base + E8390_CMD); 831 832 /* 833 * Clear the Rx ring of all the debris, and ack the interrupt. 834 */ 835 ei_receive(dev); 836 ei_outb_p(ENISR_OVER, e8390_base+EN0_ISR); 837 838 /* 839 * Leave loopback mode, and resend any packet that got stopped. 840 */ 841 ei_outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR); 842 if (must_resend) 843 ei_outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START + E8390_TRANS, e8390_base + E8390_CMD); 844 } 845 846 /* 847 * Collect the stats. This is called unlocked and from several contexts. 848 */ 849 850 static struct net_device_stats *__ei_get_stats(struct net_device *dev) 851 { 852 unsigned long ioaddr = dev->base_addr; 853 struct ei_device *ei_local = netdev_priv(dev); 854 unsigned long flags; 855 856 /* If the card is stopped, just return the present stats. */ 857 if (!netif_running(dev)) 858 return &dev->stats; 859 860 spin_lock_irqsave(&ei_local->page_lock, flags); 861 /* Read the counter registers, assuming we are in page 0. */ 862 dev->stats.rx_frame_errors += ei_inb_p(ioaddr + EN0_COUNTER0); 863 dev->stats.rx_crc_errors += ei_inb_p(ioaddr + EN0_COUNTER1); 864 dev->stats.rx_missed_errors += ei_inb_p(ioaddr + EN0_COUNTER2); 865 spin_unlock_irqrestore(&ei_local->page_lock, flags); 866 867 return &dev->stats; 868 } 869 870 /* 871 * Form the 64 bit 8390 multicast table from the linked list of addresses 872 * associated with this dev structure. 873 */ 874 875 static inline void make_mc_bits(u8 *bits, struct net_device *dev) 876 { 877 struct netdev_hw_addr *ha; 878 879 netdev_for_each_mc_addr(ha, dev) { 880 u32 crc = ether_crc(ETH_ALEN, ha->addr); 881 /* 882 * The 8390 uses the 6 most significant bits of the 883 * CRC to index the multicast table. 884 */ 885 bits[crc>>29] |= (1<<((crc>>26)&7)); 886 } 887 } 888 889 /** 890 * do_set_multicast_list - set/clear multicast filter 891 * @dev: net device for which multicast filter is adjusted 892 * 893 * Set or clear the multicast filter for this adaptor. May be called 894 * from a BH in 2.1.x. Must be called with lock held. 895 */ 896 897 static void do_set_multicast_list(struct net_device *dev) 898 { 899 unsigned long e8390_base = dev->base_addr; 900 int i; 901 struct ei_device *ei_local = netdev_priv(dev); 902 903 if (!(dev->flags&(IFF_PROMISC|IFF_ALLMULTI))) { 904 memset(ei_local->mcfilter, 0, 8); 905 if (!netdev_mc_empty(dev)) 906 make_mc_bits(ei_local->mcfilter, dev); 907 } else 908 memset(ei_local->mcfilter, 0xFF, 8); /* mcast set to accept-all */ 909 910 /* 911 * DP8390 manuals don't specify any magic sequence for altering 912 * the multicast regs on an already running card. To be safe, we 913 * ensure multicast mode is off prior to loading up the new hash 914 * table. If this proves to be not enough, we can always resort 915 * to stopping the NIC, loading the table and then restarting. 916 * 917 * Bug Alert! The MC regs on the SMC 83C690 (SMC Elite and SMC 918 * Elite16) appear to be write-only. The NS 8390 data sheet lists 919 * them as r/w so this is a bug. The SMC 83C790 (SMC Ultra and 920 * Ultra32 EISA) appears to have this bug fixed. 921 */ 922 923 if (netif_running(dev)) 924 ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR); 925 ei_outb_p(E8390_NODMA + E8390_PAGE1, e8390_base + E8390_CMD); 926 for (i = 0; i < 8; i++) { 927 ei_outb_p(ei_local->mcfilter[i], e8390_base + EN1_MULT_SHIFT(i)); 928 #ifndef BUG_83C690 929 if (ei_inb_p(e8390_base + EN1_MULT_SHIFT(i)) != ei_local->mcfilter[i]) 930 netdev_err(dev, "Multicast filter read/write mismap %d\n", 931 i); 932 #endif 933 } 934 ei_outb_p(E8390_NODMA + E8390_PAGE0, e8390_base + E8390_CMD); 935 936 if (dev->flags&IFF_PROMISC) 937 ei_outb_p(E8390_RXCONFIG | 0x18, e8390_base + EN0_RXCR); 938 else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev)) 939 ei_outb_p(E8390_RXCONFIG | 0x08, e8390_base + EN0_RXCR); 940 else 941 ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR); 942 } 943 944 /* 945 * Called without lock held. This is invoked from user context and may 946 * be parallel to just about everything else. Its also fairly quick and 947 * not called too often. Must protect against both bh and irq users 948 */ 949 950 static void __ei_set_multicast_list(struct net_device *dev) 951 { 952 unsigned long flags; 953 struct ei_device *ei_local = netdev_priv(dev); 954 955 spin_lock_irqsave(&ei_local->page_lock, flags); 956 do_set_multicast_list(dev); 957 spin_unlock_irqrestore(&ei_local->page_lock, flags); 958 } 959 960 /** 961 * ethdev_setup - init rest of 8390 device struct 962 * @dev: network device structure to init 963 * 964 * Initialize the rest of the 8390 device structure. Do NOT __init 965 * this, as it is used by 8390 based modular drivers too. 966 */ 967 968 static void ethdev_setup(struct net_device *dev) 969 { 970 struct ei_device *ei_local = netdev_priv(dev); 971 972 if ((msg_enable & NETIF_MSG_DRV) && (version_printed++ == 0)) 973 pr_info("%s", version); 974 975 ether_setup(dev); 976 977 spin_lock_init(&ei_local->page_lock); 978 979 ei_local->msg_enable = msg_enable; 980 } 981 982 /** 983 * alloc_ei_netdev - alloc_etherdev counterpart for 8390 984 * @size: extra bytes to allocate 985 * 986 * Allocate 8390-specific net_device. 987 */ 988 static struct net_device *____alloc_ei_netdev(int size) 989 { 990 return alloc_netdev(sizeof(struct ei_device) + size, "eth%d", 991 NET_NAME_UNKNOWN, ethdev_setup); 992 } 993 994 995 996 997 /* This page of functions should be 8390 generic */ 998 /* Follow National Semi's recommendations for initializing the "NIC". */ 999 1000 /** 1001 * NS8390_init - initialize 8390 hardware 1002 * @dev: network device to initialize 1003 * @startp: boolean. non-zero value to initiate chip processing 1004 * 1005 * Must be called with lock held. 1006 */ 1007 1008 static void __NS8390_init(struct net_device *dev, int startp) 1009 { 1010 unsigned long e8390_base = dev->base_addr; 1011 struct ei_device *ei_local = netdev_priv(dev); 1012 int i; 1013 int endcfg = ei_local->word16 1014 ? (0x48 | ENDCFG_WTS | (ei_local->bigendian ? ENDCFG_BOS : 0)) 1015 : 0x48; 1016 1017 if (sizeof(struct e8390_pkt_hdr) != 4) 1018 panic("8390.c: header struct mispacked\n"); 1019 /* Follow National Semi's recommendations for initing the DP83902. */ 1020 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); /* 0x21 */ 1021 ei_outb_p(endcfg, e8390_base + EN0_DCFG); /* 0x48 or 0x49 */ 1022 /* Clear the remote byte count registers. */ 1023 ei_outb_p(0x00, e8390_base + EN0_RCNTLO); 1024 ei_outb_p(0x00, e8390_base + EN0_RCNTHI); 1025 /* Set to monitor and loopback mode -- this is vital!. */ 1026 ei_outb_p(E8390_RXOFF, e8390_base + EN0_RXCR); /* 0x20 */ 1027 ei_outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); /* 0x02 */ 1028 /* Set the transmit page and receive ring. */ 1029 ei_outb_p(ei_local->tx_start_page, e8390_base + EN0_TPSR); 1030 ei_local->tx1 = ei_local->tx2 = 0; 1031 ei_outb_p(ei_local->rx_start_page, e8390_base + EN0_STARTPG); 1032 ei_outb_p(ei_local->stop_page-1, e8390_base + EN0_BOUNDARY); /* 3c503 says 0x3f,NS0x26*/ 1033 ei_local->current_page = ei_local->rx_start_page; /* assert boundary+1 */ 1034 ei_outb_p(ei_local->stop_page, e8390_base + EN0_STOPPG); 1035 /* Clear the pending interrupts and mask. */ 1036 ei_outb_p(0xFF, e8390_base + EN0_ISR); 1037 ei_outb_p(0x00, e8390_base + EN0_IMR); 1038 1039 /* Copy the station address into the DS8390 registers. */ 1040 1041 ei_outb_p(E8390_NODMA + E8390_PAGE1 + E8390_STOP, e8390_base+E8390_CMD); /* 0x61 */ 1042 for (i = 0; i < 6; i++) { 1043 ei_outb_p(dev->dev_addr[i], e8390_base + EN1_PHYS_SHIFT(i)); 1044 if ((netif_msg_probe(ei_local)) && 1045 ei_inb_p(e8390_base + EN1_PHYS_SHIFT(i)) != dev->dev_addr[i]) 1046 netdev_err(dev, 1047 "Hw. address read/write mismap %d\n", i); 1048 } 1049 1050 ei_outb_p(ei_local->rx_start_page, e8390_base + EN1_CURPAG); 1051 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); 1052 1053 ei_local->tx1 = ei_local->tx2 = 0; 1054 ei_local->txing = 0; 1055 1056 if (startp) { 1057 ei_outb_p(0xff, e8390_base + EN0_ISR); 1058 ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR); 1059 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base+E8390_CMD); 1060 ei_outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR); /* xmit on. */ 1061 /* 3c503 TechMan says rxconfig only after the NIC is started. */ 1062 ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR); /* rx on, */ 1063 do_set_multicast_list(dev); /* (re)load the mcast table */ 1064 } 1065 } 1066 1067 /* Trigger a transmit start, assuming the length is valid. 1068 Always called with the page lock held */ 1069 1070 static void NS8390_trigger_send(struct net_device *dev, unsigned int length, 1071 int start_page) 1072 { 1073 unsigned long e8390_base = dev->base_addr; 1074 struct ei_device *ei_local __attribute((unused)) = netdev_priv(dev); 1075 1076 ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base+E8390_CMD); 1077 1078 if (ei_inb_p(e8390_base + E8390_CMD) & E8390_TRANS) { 1079 netdev_warn(dev, "trigger_send() called with the transmitter busy\n"); 1080 return; 1081 } 1082 ei_outb_p(length & 0xff, e8390_base + EN0_TCNTLO); 1083 ei_outb_p(length >> 8, e8390_base + EN0_TCNTHI); 1084 ei_outb_p(start_page, e8390_base + EN0_TPSR); 1085 ei_outb_p(E8390_NODMA+E8390_TRANS+E8390_START, e8390_base+E8390_CMD); 1086 } 1087