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/build_bug.h> 54#include <linux/module.h> 55#include <linux/kernel.h> 56#include <linux/jiffies.h> 57#include <linux/fs.h> 58#include <linux/types.h> 59#include <linux/string.h> 60#include <linux/bitops.h> 61#include <linux/uaccess.h> 62#include <linux/io.h> 63#include <asm/irq.h> 64#include <linux/delay.h> 65#include <linux/errno.h> 66#include <linux/fcntl.h> 67#include <linux/in.h> 68#include <linux/interrupt.h> 69#include <linux/init.h> 70#include <linux/crc32.h> 71 72#include <linux/netdevice.h> 73#include <linux/etherdevice.h> 74 75#define NS8390_CORE 76#include "8390.h" 77 78#define BUG_83C690 79 80/* These are the operational function interfaces to board-specific 81 routines. 82 void reset_8390(struct net_device *dev) 83 Resets the board associated with DEV, including a hardware reset of 84 the 8390. This is only called when there is a transmit timeout, and 85 it is always followed by 8390_init(). 86 void block_output(struct net_device *dev, int count, const unsigned char *buf, 87 int start_page) 88 Write the COUNT bytes of BUF to the packet buffer at START_PAGE. The 89 "page" value uses the 8390's 256-byte pages. 90 void get_8390_hdr(struct net_device *dev, struct e8390_hdr *hdr, int ring_page) 91 Read the 4 byte, page aligned 8390 header. *If* there is a 92 subsequent read, it will be of the rest of the packet. 93 void block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset) 94 Read COUNT bytes from the packet buffer into the skb data area. Start 95 reading from RING_OFFSET, the address as the 8390 sees it. This will always 96 follow the read of the 8390 header. 97*/ 98#define ei_reset_8390 (ei_local->reset_8390) 99#define ei_block_output (ei_local->block_output) 100#define ei_block_input (ei_local->block_input) 101#define ei_get_8390_hdr (ei_local->get_8390_hdr) 102 103/* Index to functions. */ 104static void ei_tx_intr(struct net_device *dev); 105static void ei_tx_err(struct net_device *dev); 106static void ei_receive(struct net_device *dev); 107static void ei_rx_overrun(struct net_device *dev); 108 109/* Routines generic to NS8390-based boards. */ 110static void NS8390_trigger_send(struct net_device *dev, unsigned int length, 111 int start_page); 112static void do_set_multicast_list(struct net_device *dev); 113static void __NS8390_init(struct net_device *dev, int startp); 114 115static unsigned version_printed; 116static int msg_enable; 117static const int default_msg_level = (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_RX_ERR | 118 NETIF_MSG_TX_ERR); 119module_param(msg_enable, int, 0444); 120MODULE_PARM_DESC(msg_enable, "Debug message level (see linux/netdevice.h for bitmap)"); 121 122/* 123 * SMP and the 8390 setup. 124 * 125 * The 8390 isn't exactly designed to be multithreaded on RX/TX. There is 126 * a page register that controls bank and packet buffer access. We guard 127 * this with ei_local->page_lock. Nobody should assume or set the page other 128 * than zero when the lock is not held. Lock holders must restore page 0 129 * before unlocking. Even pure readers must take the lock to protect in 130 * page 0. 131 * 132 * To make life difficult the chip can also be very slow. We therefore can't 133 * just use spinlocks. For the longer lockups we disable the irq the device 134 * sits on and hold the lock. We must hold the lock because there is a dual 135 * processor case other than interrupts (get stats/set multicast list in 136 * parallel with each other and transmit). 137 * 138 * Note: in theory we can just disable the irq on the card _but_ there is 139 * a latency on SMP irq delivery. So we can easily go "disable irq" "sync irqs" 140 * enter lock, take the queued irq. So we waddle instead of flying. 141 * 142 * Finally by special arrangement for the purpose of being generally 143 * annoying the transmit function is called bh atomic. That places 144 * restrictions on the user context callers as disable_irq won't save 145 * them. 146 * 147 * Additional explanation of problems with locking by Alan Cox: 148 * 149 * "The author (me) didn't use spin_lock_irqsave because the slowness of the 150 * card means that approach caused horrible problems like losing serial data 151 * at 38400 baud on some chips. Remember many 8390 nics on PCI were ISA 152 * chips with FPGA front ends. 153 * 154 * Ok the logic behind the 8390 is very simple: 155 * 156 * Things to know 157 * - IRQ delivery is asynchronous to the PCI bus 158 * - Blocking the local CPU IRQ via spin locks was too slow 159 * - The chip has register windows needing locking work 160 * 161 * So the path was once (I say once as people appear to have changed it 162 * in the mean time and it now looks rather bogus if the changes to use 163 * disable_irq_nosync_irqsave are disabling the local IRQ) 164 * 165 * 166 * Take the page lock 167 * Mask the IRQ on chip 168 * Disable the IRQ (but not mask locally- someone seems to have 169 * broken this with the lock validator stuff) 170 * [This must be _nosync as the page lock may otherwise 171 * deadlock us] 172 * Drop the page lock and turn IRQs back on 173 * 174 * At this point an existing IRQ may still be running but we can't 175 * get a new one 176 * 177 * Take the lock (so we know the IRQ has terminated) but don't mask 178 * the IRQs on the processor 179 * Set irqlock [for debug] 180 * 181 * Transmit (slow as ****) 182 * 183 * re-enable the IRQ 184 * 185 * 186 * We have to use disable_irq because otherwise you will get delayed 187 * interrupts on the APIC bus deadlocking the transmit path. 188 * 189 * Quite hairy but the chip simply wasn't designed for SMP and you can't 190 * even ACK an interrupt without risking corrupting other parallel 191 * activities on the chip." [lkml, 25 Jul 2007] 192 */ 193 194 195 196/** 197 * ei_open - Open/initialize the board. 198 * @dev: network device to initialize 199 * 200 * This routine goes all-out, setting everything 201 * up anew at each open, even though many of these registers should only 202 * need to be set once at boot. 203 */ 204static int __ei_open(struct net_device *dev) 205{ 206 unsigned long flags; 207 struct ei_device *ei_local = netdev_priv(dev); 208 209 if (dev->watchdog_timeo <= 0) 210 dev->watchdog_timeo = TX_TIMEOUT; 211 212 /* 213 * Grab the page lock so we own the register set, then call 214 * the init function. 215 */ 216 217 spin_lock_irqsave(&ei_local->page_lock, flags); 218 __NS8390_init(dev, 1); 219 /* Set the flag before we drop the lock, That way the IRQ arrives 220 after its set and we get no silly warnings */ 221 netif_start_queue(dev); 222 spin_unlock_irqrestore(&ei_local->page_lock, flags); 223 ei_local->irqlock = 0; 224 return 0; 225} 226 227/** 228 * ei_close - shut down network device 229 * @dev: network device to close 230 * 231 * Opposite of ei_open(). Only used when "ifconfig <devname> down" is done. 232 */ 233static int __ei_close(struct net_device *dev) 234{ 235 struct ei_device *ei_local = netdev_priv(dev); 236 unsigned long flags; 237 238 /* 239 * Hold the page lock during close 240 */ 241 242 spin_lock_irqsave(&ei_local->page_lock, flags); 243 __NS8390_init(dev, 0); 244 spin_unlock_irqrestore(&ei_local->page_lock, flags); 245 netif_stop_queue(dev); 246 return 0; 247} 248 249/** 250 * ei_tx_timeout - handle transmit time out condition 251 * @dev: network device which has apparently fallen asleep 252 * 253 * Called by kernel when device never acknowledges a transmit has 254 * completed (or failed) - i.e. never posted a Tx related interrupt. 255 */ 256 257static void __ei_tx_timeout(struct net_device *dev, unsigned int txqueue) 258{ 259 unsigned long e8390_base = dev->base_addr; 260 struct ei_device *ei_local = netdev_priv(dev); 261 int txsr, isr, tickssofar = jiffies - dev_trans_start(dev); 262 unsigned long flags; 263 264 dev->stats.tx_errors++; 265 266 spin_lock_irqsave(&ei_local->page_lock, flags); 267 txsr = ei_inb(e8390_base+EN0_TSR); 268 isr = ei_inb(e8390_base+EN0_ISR); 269 spin_unlock_irqrestore(&ei_local->page_lock, flags); 270 271 netdev_dbg(dev, "Tx timed out, %s TSR=%#2x, ISR=%#2x, t=%d\n", 272 (txsr & ENTSR_ABT) ? "excess collisions." : 273 (isr) ? "lost interrupt?" : "cable problem?", 274 txsr, isr, tickssofar); 275 276 if (!isr && !dev->stats.tx_packets) { 277 /* The 8390 probably hasn't gotten on the cable yet. */ 278 ei_local->interface_num ^= 1; /* Try a different xcvr. */ 279 } 280 281 /* Ugly but a reset can be slow, yet must be protected */ 282 283 disable_irq_nosync_lockdep(dev->irq); 284 spin_lock(&ei_local->page_lock); 285 286 /* Try to restart the card. Perhaps the user has fixed something. */ 287 ei_reset_8390(dev); 288 __NS8390_init(dev, 1); 289 290 spin_unlock(&ei_local->page_lock); 291 enable_irq_lockdep(dev->irq); 292 netif_wake_queue(dev); 293} 294 295/** 296 * ei_start_xmit - begin packet transmission 297 * @skb: packet to be sent 298 * @dev: network device to which packet is sent 299 * 300 * Sends a packet to an 8390 network device. 301 */ 302 303static netdev_tx_t __ei_start_xmit(struct sk_buff *skb, 304 struct net_device *dev) 305{ 306 unsigned long e8390_base = dev->base_addr; 307 struct ei_device *ei_local = netdev_priv(dev); 308 int send_length = skb->len, output_page; 309 unsigned long flags; 310 char buf[ETH_ZLEN]; 311 char *data = skb->data; 312 313 if (skb->len < ETH_ZLEN) { 314 memset(buf, 0, ETH_ZLEN); /* more efficient than doing just the needed bits */ 315 memcpy(buf, data, skb->len); 316 send_length = ETH_ZLEN; 317 data = buf; 318 } 319 320 /* Mask interrupts from the ethercard. 321 SMP: We have to grab the lock here otherwise the IRQ handler 322 on another CPU can flip window and race the IRQ mask set. We end 323 up trashing the mcast filter not disabling irqs if we don't lock */ 324 325 spin_lock_irqsave(&ei_local->page_lock, flags); 326 ei_outb_p(0x00, e8390_base + EN0_IMR); 327 spin_unlock_irqrestore(&ei_local->page_lock, flags); 328 329 330 /* 331 * Slow phase with lock held. 332 */ 333 334 disable_irq_nosync_lockdep_irqsave(dev->irq, &flags); 335 336 spin_lock(&ei_local->page_lock); 337 338 ei_local->irqlock = 1; 339 340 /* 341 * We have two Tx slots available for use. Find the first free 342 * slot, and then perform some sanity checks. With two Tx bufs, 343 * you get very close to transmitting back-to-back packets. With 344 * only one Tx buf, the transmitter sits idle while you reload the 345 * card, leaving a substantial gap between each transmitted packet. 346 */ 347 348 if (ei_local->tx1 == 0) { 349 output_page = ei_local->tx_start_page; 350 ei_local->tx1 = send_length; 351 if ((netif_msg_tx_queued(ei_local)) && 352 ei_local->tx2 > 0) 353 netdev_dbg(dev, 354 "idle transmitter tx2=%d, lasttx=%d, txing=%d\n", 355 ei_local->tx2, ei_local->lasttx, ei_local->txing); 356 } else if (ei_local->tx2 == 0) { 357 output_page = ei_local->tx_start_page + TX_PAGES/2; 358 ei_local->tx2 = send_length; 359 if ((netif_msg_tx_queued(ei_local)) && 360 ei_local->tx1 > 0) 361 netdev_dbg(dev, 362 "idle transmitter, tx1=%d, lasttx=%d, txing=%d\n", 363 ei_local->tx1, ei_local->lasttx, ei_local->txing); 364 } else { /* We should never get here. */ 365 netif_dbg(ei_local, tx_err, dev, 366 "No Tx buffers free! tx1=%d tx2=%d last=%d\n", 367 ei_local->tx1, ei_local->tx2, ei_local->lasttx); 368 ei_local->irqlock = 0; 369 netif_stop_queue(dev); 370 ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR); 371 spin_unlock(&ei_local->page_lock); 372 enable_irq_lockdep_irqrestore(dev->irq, &flags); 373 dev->stats.tx_errors++; 374 return NETDEV_TX_BUSY; 375 } 376 377 /* 378 * Okay, now upload the packet and trigger a send if the transmitter 379 * isn't already sending. If it is busy, the interrupt handler will 380 * trigger the send later, upon receiving a Tx done interrupt. 381 */ 382 383 ei_block_output(dev, send_length, data, output_page); 384 385 if (!ei_local->txing) { 386 ei_local->txing = 1; 387 NS8390_trigger_send(dev, send_length, output_page); 388 if (output_page == ei_local->tx_start_page) { 389 ei_local->tx1 = -1; 390 ei_local->lasttx = -1; 391 } else { 392 ei_local->tx2 = -1; 393 ei_local->lasttx = -2; 394 } 395 } else 396 ei_local->txqueue++; 397 398 if (ei_local->tx1 && ei_local->tx2) 399 netif_stop_queue(dev); 400 else 401 netif_start_queue(dev); 402 403 /* Turn 8390 interrupts back on. */ 404 ei_local->irqlock = 0; 405 ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR); 406 407 spin_unlock(&ei_local->page_lock); 408 enable_irq_lockdep_irqrestore(dev->irq, &flags); 409 skb_tx_timestamp(skb); 410 dev_consume_skb_any(skb); 411 dev->stats.tx_bytes += send_length; 412 413 return NETDEV_TX_OK; 414} 415 416/** 417 * ei_interrupt - handle the interrupts from an 8390 418 * @irq: interrupt number 419 * @dev_id: a pointer to the net_device 420 * 421 * Handle the ether interface interrupts. We pull packets from 422 * the 8390 via the card specific functions and fire them at the networking 423 * stack. We also handle transmit completions and wake the transmit path if 424 * necessary. We also update the counters and do other housekeeping as 425 * needed. 426 */ 427 428static irqreturn_t __ei_interrupt(int irq, void *dev_id) 429{ 430 struct net_device *dev = dev_id; 431 unsigned long e8390_base = dev->base_addr; 432 int interrupts, nr_serviced = 0; 433 struct ei_device *ei_local = netdev_priv(dev); 434 435 /* 436 * Protect the irq test too. 437 */ 438 439 spin_lock(&ei_local->page_lock); 440 441 if (ei_local->irqlock) { 442 /* 443 * This might just be an interrupt for a PCI device sharing 444 * this line 445 */ 446 netdev_err(dev, "Interrupted while interrupts are masked! isr=%#2x imr=%#2x\n", 447 ei_inb_p(e8390_base + EN0_ISR), 448 ei_inb_p(e8390_base + EN0_IMR)); 449 spin_unlock(&ei_local->page_lock); 450 return IRQ_NONE; 451 } 452 453 /* Change to page 0 and read the intr status reg. */ 454 ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD); 455 netif_dbg(ei_local, intr, dev, "interrupt(isr=%#2.2x)\n", 456 ei_inb_p(e8390_base + EN0_ISR)); 457 458 /* !!Assumption!! -- we stay in page 0. Don't break this. */ 459 while ((interrupts = ei_inb_p(e8390_base + EN0_ISR)) != 0 && 460 ++nr_serviced < MAX_SERVICE) { 461 if (!netif_running(dev)) { 462 netdev_warn(dev, "interrupt from stopped card\n"); 463 /* rmk - acknowledge the interrupts */ 464 ei_outb_p(interrupts, e8390_base + EN0_ISR); 465 interrupts = 0; 466 break; 467 } 468 if (interrupts & ENISR_OVER) 469 ei_rx_overrun(dev); 470 else if (interrupts & (ENISR_RX+ENISR_RX_ERR)) { 471 /* Got a good (?) packet. */ 472 ei_receive(dev); 473 } 474 /* Push the next to-transmit packet through. */ 475 if (interrupts & ENISR_TX) 476 ei_tx_intr(dev); 477 else if (interrupts & ENISR_TX_ERR) 478 ei_tx_err(dev); 479 480 if (interrupts & ENISR_COUNTERS) { 481 dev->stats.rx_frame_errors += ei_inb_p(e8390_base + EN0_COUNTER0); 482 dev->stats.rx_crc_errors += ei_inb_p(e8390_base + EN0_COUNTER1); 483 dev->stats.rx_missed_errors += ei_inb_p(e8390_base + EN0_COUNTER2); 484 ei_outb_p(ENISR_COUNTERS, e8390_base + EN0_ISR); /* Ack intr. */ 485 } 486 487 /* Ignore any RDC interrupts that make it back to here. */ 488 if (interrupts & ENISR_RDC) 489 ei_outb_p(ENISR_RDC, e8390_base + EN0_ISR); 490 491 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD); 492 } 493 494 if (interrupts && (netif_msg_intr(ei_local))) { 495 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD); 496 if (nr_serviced >= MAX_SERVICE) { 497 /* 0xFF is valid for a card removal */ 498 if (interrupts != 0xFF) 499 netdev_warn(dev, "Too much work at interrupt, status %#2.2x\n", 500 interrupts); 501 ei_outb_p(ENISR_ALL, e8390_base + EN0_ISR); /* Ack. most intrs. */ 502 } else { 503 netdev_warn(dev, "unknown interrupt %#2x\n", interrupts); 504 ei_outb_p(0xff, e8390_base + EN0_ISR); /* Ack. all intrs. */ 505 } 506 } 507 spin_unlock(&ei_local->page_lock); 508 return IRQ_RETVAL(nr_serviced > 0); 509} 510 511#ifdef CONFIG_NET_POLL_CONTROLLER 512static void __ei_poll(struct net_device *dev) 513{ 514 disable_irq(dev->irq); 515 __ei_interrupt(dev->irq, dev); 516 enable_irq(dev->irq); 517} 518#endif 519 520/** 521 * ei_tx_err - handle transmitter error 522 * @dev: network device which threw the exception 523 * 524 * A transmitter error has happened. Most likely excess collisions (which 525 * is a fairly normal condition). If the error is one where the Tx will 526 * have been aborted, we try and send another one right away, instead of 527 * letting the failed packet sit and collect dust in the Tx buffer. This 528 * is a much better solution as it avoids kernel based Tx timeouts, and 529 * an unnecessary card reset. 530 * 531 * Called with lock held. 532 */ 533 534static void ei_tx_err(struct net_device *dev) 535{ 536 unsigned long e8390_base = dev->base_addr; 537 /* ei_local is used on some platforms via the EI_SHIFT macro */ 538 struct ei_device *ei_local __maybe_unused = netdev_priv(dev); 539 unsigned char txsr = ei_inb_p(e8390_base+EN0_TSR); 540 unsigned char tx_was_aborted = txsr & (ENTSR_ABT+ENTSR_FU); 541 542#ifdef VERBOSE_ERROR_DUMP 543 netdev_dbg(dev, "transmitter error (%#2x):", txsr); 544 if (txsr & ENTSR_ABT) 545 pr_cont(" excess-collisions "); 546 if (txsr & ENTSR_ND) 547 pr_cont(" non-deferral "); 548 if (txsr & ENTSR_CRS) 549 pr_cont(" lost-carrier "); 550 if (txsr & ENTSR_FU) 551 pr_cont(" FIFO-underrun "); 552 if (txsr & ENTSR_CDH) 553 pr_cont(" lost-heartbeat "); 554 pr_cont("\n"); 555#endif 556 557 ei_outb_p(ENISR_TX_ERR, e8390_base + EN0_ISR); /* Ack intr. */ 558 559 if (tx_was_aborted) 560 ei_tx_intr(dev); 561 else { 562 dev->stats.tx_errors++; 563 if (txsr & ENTSR_CRS) 564 dev->stats.tx_carrier_errors++; 565 if (txsr & ENTSR_CDH) 566 dev->stats.tx_heartbeat_errors++; 567 if (txsr & ENTSR_OWC) 568 dev->stats.tx_window_errors++; 569 } 570} 571 572/** 573 * ei_tx_intr - transmit interrupt handler 574 * @dev: network device for which tx intr is handled 575 * 576 * We have finished a transmit: check for errors and then trigger the next 577 * packet to be sent. Called with lock held. 578 */ 579 580static void ei_tx_intr(struct net_device *dev) 581{ 582 unsigned long e8390_base = dev->base_addr; 583 struct ei_device *ei_local = netdev_priv(dev); 584 int status = ei_inb(e8390_base + EN0_TSR); 585 586 ei_outb_p(ENISR_TX, e8390_base + EN0_ISR); /* Ack intr. */ 587 588 /* 589 * There are two Tx buffers, see which one finished, and trigger 590 * the send of another one if it exists. 591 */ 592 ei_local->txqueue--; 593 594 if (ei_local->tx1 < 0) { 595 if (ei_local->lasttx != 1 && ei_local->lasttx != -1) 596 pr_err("%s: bogus last_tx_buffer %d, tx1=%d\n", 597 ei_local->name, ei_local->lasttx, ei_local->tx1); 598 ei_local->tx1 = 0; 599 if (ei_local->tx2 > 0) { 600 ei_local->txing = 1; 601 NS8390_trigger_send(dev, ei_local->tx2, ei_local->tx_start_page + 6); 602 netif_trans_update(dev); 603 ei_local->tx2 = -1; 604 ei_local->lasttx = 2; 605 } else { 606 ei_local->lasttx = 20; 607 ei_local->txing = 0; 608 } 609 } else if (ei_local->tx2 < 0) { 610 if (ei_local->lasttx != 2 && ei_local->lasttx != -2) 611 pr_err("%s: bogus last_tx_buffer %d, tx2=%d\n", 612 ei_local->name, ei_local->lasttx, ei_local->tx2); 613 ei_local->tx2 = 0; 614 if (ei_local->tx1 > 0) { 615 ei_local->txing = 1; 616 NS8390_trigger_send(dev, ei_local->tx1, ei_local->tx_start_page); 617 netif_trans_update(dev); 618 ei_local->tx1 = -1; 619 ei_local->lasttx = 1; 620 } else { 621 ei_local->lasttx = 10; 622 ei_local->txing = 0; 623 } 624 } /* else 625 netdev_warn(dev, "unexpected TX-done interrupt, lasttx=%d\n", 626 ei_local->lasttx); 627*/ 628 629 /* Minimize Tx latency: update the statistics after we restart TXing. */ 630 if (status & ENTSR_COL) 631 dev->stats.collisions++; 632 if (status & ENTSR_PTX) 633 dev->stats.tx_packets++; 634 else { 635 dev->stats.tx_errors++; 636 if (status & ENTSR_ABT) { 637 dev->stats.tx_aborted_errors++; 638 dev->stats.collisions += 16; 639 } 640 if (status & ENTSR_CRS) 641 dev->stats.tx_carrier_errors++; 642 if (status & ENTSR_FU) 643 dev->stats.tx_fifo_errors++; 644 if (status & ENTSR_CDH) 645 dev->stats.tx_heartbeat_errors++; 646 if (status & ENTSR_OWC) 647 dev->stats.tx_window_errors++; 648 } 649 netif_wake_queue(dev); 650} 651 652/** 653 * ei_receive - receive some packets 654 * @dev: network device with which receive will be run 655 * 656 * We have a good packet(s), get it/them out of the buffers. 657 * Called with lock held. 658 */ 659 660static void ei_receive(struct net_device *dev) 661{ 662 unsigned long e8390_base = dev->base_addr; 663 struct ei_device *ei_local = netdev_priv(dev); 664 unsigned char rxing_page, this_frame, next_frame; 665 unsigned short current_offset; 666 int rx_pkt_count = 0; 667 struct e8390_pkt_hdr rx_frame; 668 int num_rx_pages = ei_local->stop_page-ei_local->rx_start_page; 669 670 while (++rx_pkt_count < 10) { 671 int pkt_len, pkt_stat; 672 673 /* Get the rx page (incoming packet pointer). */ 674 ei_outb_p(E8390_NODMA+E8390_PAGE1, e8390_base + E8390_CMD); 675 rxing_page = ei_inb_p(e8390_base + EN1_CURPAG); 676 ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD); 677 678 /* Remove one frame from the ring. Boundary is always a page behind. */ 679 this_frame = ei_inb_p(e8390_base + EN0_BOUNDARY) + 1; 680 if (this_frame >= ei_local->stop_page) 681 this_frame = ei_local->rx_start_page; 682 683 /* Someday we'll omit the previous, iff we never get this message. 684 (There is at least one clone claimed to have a problem.) 685 686 Keep quiet if it looks like a card removal. One problem here 687 is that some clones crash in roughly the same way. 688 */ 689 if ((netif_msg_rx_status(ei_local)) && 690 this_frame != ei_local->current_page && 691 (this_frame != 0x0 || rxing_page != 0xFF)) 692 netdev_err(dev, 693 "mismatched read page pointers %2x vs %2x\n", 694 this_frame, ei_local->current_page); 695 696 if (this_frame == rxing_page) /* Read all the frames? */ 697 break; /* Done for now */ 698 699 current_offset = this_frame << 8; 700 ei_get_8390_hdr(dev, &rx_frame, this_frame); 701 702 pkt_len = rx_frame.count - sizeof(struct e8390_pkt_hdr); 703 pkt_stat = rx_frame.status; 704 705 next_frame = this_frame + 1 + ((pkt_len+4)>>8); 706 707 /* Check for bogosity warned by 3c503 book: the status byte is never 708 written. This happened a lot during testing! This code should be 709 cleaned up someday. */ 710 if (rx_frame.next != next_frame && 711 rx_frame.next != next_frame + 1 && 712 rx_frame.next != next_frame - num_rx_pages && 713 rx_frame.next != next_frame + 1 - num_rx_pages) { 714 ei_local->current_page = rxing_page; 715 ei_outb(ei_local->current_page-1, e8390_base+EN0_BOUNDARY); 716 dev->stats.rx_errors++; 717 continue; 718 } 719 720 if (pkt_len < 60 || pkt_len > 1518) { 721 netif_dbg(ei_local, rx_status, dev, 722 "bogus packet size: %d, status=%#2x nxpg=%#2x\n", 723 rx_frame.count, rx_frame.status, 724 rx_frame.next); 725 dev->stats.rx_errors++; 726 dev->stats.rx_length_errors++; 727 } else if ((pkt_stat & 0x0F) == ENRSR_RXOK) { 728 struct sk_buff *skb; 729 730 skb = netdev_alloc_skb(dev, pkt_len + 2); 731 if (skb == NULL) { 732 netif_err(ei_local, rx_err, dev, 733 "Couldn't allocate a sk_buff of size %d\n", 734 pkt_len); 735 dev->stats.rx_dropped++; 736 break; 737 } else { 738 skb_reserve(skb, 2); /* IP headers on 16 byte boundaries */ 739 skb_put(skb, pkt_len); /* Make room */ 740 ei_block_input(dev, pkt_len, skb, current_offset + sizeof(rx_frame)); 741 skb->protocol = eth_type_trans(skb, dev); 742 if (!skb_defer_rx_timestamp(skb)) 743 netif_rx(skb); 744 dev->stats.rx_packets++; 745 dev->stats.rx_bytes += pkt_len; 746 if (pkt_stat & ENRSR_PHY) 747 dev->stats.multicast++; 748 } 749 } else { 750 netif_err(ei_local, rx_err, dev, 751 "bogus packet: status=%#2x nxpg=%#2x size=%d\n", 752 rx_frame.status, rx_frame.next, 753 rx_frame.count); 754 dev->stats.rx_errors++; 755 /* NB: The NIC counts CRC, frame and missed errors. */ 756 if (pkt_stat & ENRSR_FO) 757 dev->stats.rx_fifo_errors++; 758 } 759 next_frame = rx_frame.next; 760 761 /* This _should_ never happen: it's here for avoiding bad clones. */ 762 if (next_frame >= ei_local->stop_page) { 763 netdev_notice(dev, "next frame inconsistency, %#2x\n", 764 next_frame); 765 next_frame = ei_local->rx_start_page; 766 } 767 ei_local->current_page = next_frame; 768 ei_outb_p(next_frame-1, e8390_base+EN0_BOUNDARY); 769 } 770 771 /* We used to also ack ENISR_OVER here, but that would sometimes mask 772 a real overrun, leaving the 8390 in a stopped state with rec'vr off. */ 773 ei_outb_p(ENISR_RX+ENISR_RX_ERR, e8390_base+EN0_ISR); 774} 775 776/** 777 * ei_rx_overrun - handle receiver overrun 778 * @dev: network device which threw exception 779 * 780 * We have a receiver overrun: we have to kick the 8390 to get it started 781 * again. Problem is that you have to kick it exactly as NS prescribes in 782 * the updated datasheets, or "the NIC may act in an unpredictable manner." 783 * This includes causing "the NIC to defer indefinitely when it is stopped 784 * on a busy network." Ugh. 785 * Called with lock held. Don't call this with the interrupts off or your 786 * computer will hate you - it takes 10ms or so. 787 */ 788 789static void ei_rx_overrun(struct net_device *dev) 790{ 791 unsigned long e8390_base = dev->base_addr; 792 unsigned char was_txing, must_resend = 0; 793 /* ei_local is used on some platforms via the EI_SHIFT macro */ 794 struct ei_device *ei_local __maybe_unused = netdev_priv(dev); 795 796 /* 797 * Record whether a Tx was in progress and then issue the 798 * stop command. 799 */ 800 was_txing = ei_inb_p(e8390_base+E8390_CMD) & E8390_TRANS; 801 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); 802 803 netif_dbg(ei_local, rx_err, dev, "Receiver overrun\n"); 804 dev->stats.rx_over_errors++; 805 806 /* 807 * Wait a full Tx time (1.2ms) + some guard time, NS says 1.6ms total. 808 * Early datasheets said to poll the reset bit, but now they say that 809 * it "is not a reliable indicator and subsequently should be ignored." 810 * We wait at least 10ms. 811 */ 812 813 mdelay(10); 814 815 /* 816 * Reset RBCR[01] back to zero as per magic incantation. 817 */ 818 ei_outb_p(0x00, e8390_base+EN0_RCNTLO); 819 ei_outb_p(0x00, e8390_base+EN0_RCNTHI); 820 821 /* 822 * See if any Tx was interrupted or not. According to NS, this 823 * step is vital, and skipping it will cause no end of havoc. 824 */ 825 826 if (was_txing) { 827 unsigned char tx_completed = ei_inb_p(e8390_base+EN0_ISR) & (ENISR_TX+ENISR_TX_ERR); 828 if (!tx_completed) 829 must_resend = 1; 830 } 831 832 /* 833 * Have to enter loopback mode and then restart the NIC before 834 * you are allowed to slurp packets up off the ring. 835 */ 836 ei_outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); 837 ei_outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START, e8390_base + E8390_CMD); 838 839 /* 840 * Clear the Rx ring of all the debris, and ack the interrupt. 841 */ 842 ei_receive(dev); 843 ei_outb_p(ENISR_OVER, e8390_base+EN0_ISR); 844 845 /* 846 * Leave loopback mode, and resend any packet that got stopped. 847 */ 848 ei_outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR); 849 if (must_resend) 850 ei_outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START + E8390_TRANS, e8390_base + E8390_CMD); 851} 852 853/* 854 * Collect the stats. This is called unlocked and from several contexts. 855 */ 856 857static struct net_device_stats *__ei_get_stats(struct net_device *dev) 858{ 859 unsigned long ioaddr = dev->base_addr; 860 struct ei_device *ei_local = netdev_priv(dev); 861 unsigned long flags; 862 863 /* If the card is stopped, just return the present stats. */ 864 if (!netif_running(dev)) 865 return &dev->stats; 866 867 spin_lock_irqsave(&ei_local->page_lock, flags); 868 /* Read the counter registers, assuming we are in page 0. */ 869 dev->stats.rx_frame_errors += ei_inb_p(ioaddr + EN0_COUNTER0); 870 dev->stats.rx_crc_errors += ei_inb_p(ioaddr + EN0_COUNTER1); 871 dev->stats.rx_missed_errors += ei_inb_p(ioaddr + EN0_COUNTER2); 872 spin_unlock_irqrestore(&ei_local->page_lock, flags); 873 874 return &dev->stats; 875} 876 877/* 878 * Form the 64 bit 8390 multicast table from the linked list of addresses 879 * associated with this dev structure. 880 */ 881 882static inline void make_mc_bits(u8 *bits, struct net_device *dev) 883{ 884 struct netdev_hw_addr *ha; 885 886 netdev_for_each_mc_addr(ha, dev) { 887 u32 crc = ether_crc(ETH_ALEN, ha->addr); 888 /* 889 * The 8390 uses the 6 most significant bits of the 890 * CRC to index the multicast table. 891 */ 892 bits[crc>>29] |= (1<<((crc>>26)&7)); 893 } 894} 895 896/** 897 * do_set_multicast_list - set/clear multicast filter 898 * @dev: net device for which multicast filter is adjusted 899 * 900 * Set or clear the multicast filter for this adaptor. May be called 901 * from a BH in 2.1.x. Must be called with lock held. 902 */ 903 904static void do_set_multicast_list(struct net_device *dev) 905{ 906 unsigned long e8390_base = dev->base_addr; 907 int i; 908 struct ei_device *ei_local = netdev_priv(dev); 909 910 if (!(dev->flags&(IFF_PROMISC|IFF_ALLMULTI))) { 911 memset(ei_local->mcfilter, 0, 8); 912 if (!netdev_mc_empty(dev)) 913 make_mc_bits(ei_local->mcfilter, dev); 914 } else 915 memset(ei_local->mcfilter, 0xFF, 8); /* mcast set to accept-all */ 916 917 /* 918 * DP8390 manuals don't specify any magic sequence for altering 919 * the multicast regs on an already running card. To be safe, we 920 * ensure multicast mode is off prior to loading up the new hash 921 * table. If this proves to be not enough, we can always resort 922 * to stopping the NIC, loading the table and then restarting. 923 * 924 * Bug Alert! The MC regs on the SMC 83C690 (SMC Elite and SMC 925 * Elite16) appear to be write-only. The NS 8390 data sheet lists 926 * them as r/w so this is a bug. The SMC 83C790 (SMC Ultra and 927 * Ultra32 EISA) appears to have this bug fixed. 928 */ 929 930 if (netif_running(dev)) 931 ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR); 932 ei_outb_p(E8390_NODMA + E8390_PAGE1, e8390_base + E8390_CMD); 933 for (i = 0; i < 8; i++) { 934 ei_outb_p(ei_local->mcfilter[i], e8390_base + EN1_MULT_SHIFT(i)); 935#ifndef BUG_83C690 936 if (ei_inb_p(e8390_base + EN1_MULT_SHIFT(i)) != ei_local->mcfilter[i]) 937 netdev_err(dev, "Multicast filter read/write mismap %d\n", 938 i); 939#endif 940 } 941 ei_outb_p(E8390_NODMA + E8390_PAGE0, e8390_base + E8390_CMD); 942 943 if (dev->flags&IFF_PROMISC) 944 ei_outb_p(E8390_RXCONFIG | 0x18, e8390_base + EN0_RXCR); 945 else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev)) 946 ei_outb_p(E8390_RXCONFIG | 0x08, e8390_base + EN0_RXCR); 947 else 948 ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR); 949} 950 951/* 952 * Called without lock held. This is invoked from user context and may 953 * be parallel to just about everything else. Its also fairly quick and 954 * not called too often. Must protect against both bh and irq users 955 */ 956 957static void __ei_set_multicast_list(struct net_device *dev) 958{ 959 unsigned long flags; 960 struct ei_device *ei_local = netdev_priv(dev); 961 962 spin_lock_irqsave(&ei_local->page_lock, flags); 963 do_set_multicast_list(dev); 964 spin_unlock_irqrestore(&ei_local->page_lock, flags); 965} 966 967/** 968 * ethdev_setup - init rest of 8390 device struct 969 * @dev: network device structure to init 970 * 971 * Initialize the rest of the 8390 device structure. Do NOT __init 972 * this, as it is used by 8390 based modular drivers too. 973 */ 974 975static void ethdev_setup(struct net_device *dev) 976{ 977 struct ei_device *ei_local = netdev_priv(dev); 978 979 ether_setup(dev); 980 981 spin_lock_init(&ei_local->page_lock); 982 983 ei_local->msg_enable = netif_msg_init(msg_enable, default_msg_level); 984 985 if (netif_msg_drv(ei_local) && (version_printed++ == 0)) 986 pr_info("%s", version); 987} 988 989/** 990 * alloc_ei_netdev - alloc_etherdev counterpart for 8390 991 * @size: extra bytes to allocate 992 * 993 * Allocate 8390-specific net_device. 994 */ 995static struct net_device *____alloc_ei_netdev(int size) 996{ 997 return alloc_netdev(sizeof(struct ei_device) + size, "eth%d", 998 NET_NAME_UNKNOWN, ethdev_setup); 999} 1000 1001 1002 1003 1004/* This page of functions should be 8390 generic */ 1005/* Follow National Semi's recommendations for initializing the "NIC". */ 1006 1007/** 1008 * NS8390_init - initialize 8390 hardware 1009 * @dev: network device to initialize 1010 * @startp: boolean. non-zero value to initiate chip processing 1011 * 1012 * Must be called with lock held. 1013 */ 1014 1015static void __NS8390_init(struct net_device *dev, int startp) 1016{ 1017 unsigned long e8390_base = dev->base_addr; 1018 struct ei_device *ei_local = netdev_priv(dev); 1019 int i; 1020 int endcfg = ei_local->word16 1021 ? (0x48 | ENDCFG_WTS | (ei_local->bigendian ? ENDCFG_BOS : 0)) 1022 : 0x48; 1023 1024 BUILD_BUG_ON(sizeof(struct e8390_pkt_hdr) != 4); 1025 /* Follow National Semi's recommendations for initing the DP83902. */ 1026 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); /* 0x21 */ 1027 ei_outb_p(endcfg, e8390_base + EN0_DCFG); /* 0x48 or 0x49 */ 1028 /* Clear the remote byte count registers. */ 1029 ei_outb_p(0x00, e8390_base + EN0_RCNTLO); 1030 ei_outb_p(0x00, e8390_base + EN0_RCNTHI); 1031 /* Set to monitor and loopback mode -- this is vital!. */ 1032 ei_outb_p(E8390_RXOFF, e8390_base + EN0_RXCR); /* 0x20 */ 1033 ei_outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); /* 0x02 */ 1034 /* Set the transmit page and receive ring. */ 1035 ei_outb_p(ei_local->tx_start_page, e8390_base + EN0_TPSR); 1036 ei_local->tx1 = ei_local->tx2 = 0; 1037 ei_outb_p(ei_local->rx_start_page, e8390_base + EN0_STARTPG); 1038 ei_outb_p(ei_local->stop_page-1, e8390_base + EN0_BOUNDARY); /* 3c503 says 0x3f,NS0x26*/ 1039 ei_local->current_page = ei_local->rx_start_page; /* assert boundary+1 */ 1040 ei_outb_p(ei_local->stop_page, e8390_base + EN0_STOPPG); 1041 /* Clear the pending interrupts and mask. */ 1042 ei_outb_p(0xFF, e8390_base + EN0_ISR); 1043 ei_outb_p(0x00, e8390_base + EN0_IMR); 1044 1045 /* Copy the station address into the DS8390 registers. */ 1046 1047 ei_outb_p(E8390_NODMA + E8390_PAGE1 + E8390_STOP, e8390_base+E8390_CMD); /* 0x61 */ 1048 for (i = 0; i < 6; i++) { 1049 ei_outb_p(dev->dev_addr[i], e8390_base + EN1_PHYS_SHIFT(i)); 1050 if ((netif_msg_probe(ei_local)) && 1051 ei_inb_p(e8390_base + EN1_PHYS_SHIFT(i)) != dev->dev_addr[i]) 1052 netdev_err(dev, 1053 "Hw. address read/write mismap %d\n", i); 1054 } 1055 1056 ei_outb_p(ei_local->rx_start_page, e8390_base + EN1_CURPAG); 1057 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); 1058 1059 ei_local->tx1 = ei_local->tx2 = 0; 1060 ei_local->txing = 0; 1061 1062 if (startp) { 1063 ei_outb_p(0xff, e8390_base + EN0_ISR); 1064 ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR); 1065 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base+E8390_CMD); 1066 ei_outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR); /* xmit on. */ 1067 /* 3c503 TechMan says rxconfig only after the NIC is started. */ 1068 ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR); /* rx on, */ 1069 do_set_multicast_list(dev); /* (re)load the mcast table */ 1070 } 1071} 1072 1073/* Trigger a transmit start, assuming the length is valid. 1074 Always called with the page lock held */ 1075 1076static void NS8390_trigger_send(struct net_device *dev, unsigned int length, 1077 int start_page) 1078{ 1079 unsigned long e8390_base = dev->base_addr; 1080 struct ei_device *ei_local __attribute((unused)) = netdev_priv(dev); 1081 1082 ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base+E8390_CMD); 1083 1084 if (ei_inb_p(e8390_base + E8390_CMD) & E8390_TRANS) { 1085 netdev_warn(dev, "trigger_send() called with the transmitter busy\n"); 1086 return; 1087 } 1088 ei_outb_p(length & 0xff, e8390_base + EN0_TCNTLO); 1089 ei_outb_p(length >> 8, e8390_base + EN0_TCNTHI); 1090 ei_outb_p(start_page, e8390_base + EN0_TPSR); 1091 ei_outb_p(E8390_NODMA+E8390_TRANS+E8390_START, e8390_base+E8390_CMD); 1092} 1093