1 // SPDX-License-Identifier: GPL-1.0+ 2 3 /* 8390.c: A general NS8390 ethernet driver core for linux. */ 4 /* 5 Written 1992-94 by Donald Becker. 6 7 Copyright 1993 United States Government as represented by the 8 Director, National Security Agency. 9 10 The author may be reached as becker@scyld.com, or C/O 11 Scyld Computing Corporation 12 410 Severn Ave., Suite 210 13 Annapolis MD 21403 14 15 16 This is the chip-specific code for many 8390-based ethernet adaptors. 17 This is not a complete driver, it must be combined with board-specific 18 code such as ne.c, wd.c, 3c503.c, etc. 19 20 Seeing how at least eight drivers use this code, (not counting the 21 PCMCIA ones either) it is easy to break some card by what seems like 22 a simple innocent change. Please contact me or Donald if you think 23 you have found something that needs changing. -- PG 24 25 26 Changelog: 27 28 Paul Gortmaker : remove set_bit lock, other cleanups. 29 Paul Gortmaker : add ei_get_8390_hdr() so we can pass skb's to 30 ei_block_input() for eth_io_copy_and_sum(). 31 Paul Gortmaker : exchange static int ei_pingpong for a #define, 32 also add better Tx error handling. 33 Paul Gortmaker : rewrite Rx overrun handling as per NS specs. 34 Alexey Kuznetsov : use the 8390's six bit hash multicast filter. 35 Paul Gortmaker : tweak ANK's above multicast changes a bit. 36 Paul Gortmaker : update packet statistics for v2.1.x 37 Alan Cox : support arbitrary stupid port mappings on the 38 68K Macintosh. Support >16bit I/O spaces 39 Paul Gortmaker : add kmod support for auto-loading of the 8390 40 module by all drivers that require it. 41 Alan Cox : Spinlocking work, added 'BUG_83C690' 42 Paul Gortmaker : Separate out Tx timeout code from Tx path. 43 Paul Gortmaker : Remove old unused single Tx buffer code. 44 Hayato Fujiwara : Add m32r support. 45 Paul Gortmaker : use skb_padto() instead of stack scratch area 46 47 Sources: 48 The National Semiconductor LAN Databook, and the 3Com 3c503 databook. 49 50 */ 51 52 #include <linux/build_bug.h> 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 int msg_enable; 116 static const int default_msg_level = (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_RX_ERR | 117 NETIF_MSG_TX_ERR); 118 module_param(msg_enable, int, 0444); 119 MODULE_PARM_DESC(msg_enable, "Debug message level (see linux/netdevice.h for bitmap)"); 120 121 /* 122 * SMP and the 8390 setup. 123 * 124 * The 8390 isn't exactly designed to be multithreaded on RX/TX. There is 125 * a page register that controls bank and packet buffer access. We guard 126 * this with ei_local->page_lock. Nobody should assume or set the page other 127 * than zero when the lock is not held. Lock holders must restore page 0 128 * before unlocking. Even pure readers must take the lock to protect in 129 * page 0. 130 * 131 * To make life difficult the chip can also be very slow. We therefore can't 132 * just use spinlocks. For the longer lockups we disable the irq the device 133 * sits on and hold the lock. We must hold the lock because there is a dual 134 * processor case other than interrupts (get stats/set multicast list in 135 * parallel with each other and transmit). 136 * 137 * Note: in theory we can just disable the irq on the card _but_ there is 138 * a latency on SMP irq delivery. So we can easily go "disable irq" "sync irqs" 139 * enter lock, take the queued irq. So we waddle instead of flying. 140 * 141 * Finally by special arrangement for the purpose of being generally 142 * annoying the transmit function is called bh atomic. That places 143 * restrictions on the user context callers as disable_irq won't save 144 * them. 145 * 146 * Additional explanation of problems with locking by Alan Cox: 147 * 148 * "The author (me) didn't use spin_lock_irqsave because the slowness of the 149 * card means that approach caused horrible problems like losing serial data 150 * at 38400 baud on some chips. Remember many 8390 nics on PCI were ISA 151 * chips with FPGA front ends. 152 * 153 * Ok the logic behind the 8390 is very simple: 154 * 155 * Things to know 156 * - IRQ delivery is asynchronous to the PCI bus 157 * - Blocking the local CPU IRQ via spin locks was too slow 158 * - The chip has register windows needing locking work 159 * 160 * So the path was once (I say once as people appear to have changed it 161 * in the mean time and it now looks rather bogus if the changes to use 162 * disable_irq_nosync_irqsave are disabling the local IRQ) 163 * 164 * 165 * Take the page lock 166 * Mask the IRQ on chip 167 * Disable the IRQ (but not mask locally- someone seems to have 168 * broken this with the lock validator stuff) 169 * [This must be _nosync as the page lock may otherwise 170 * deadlock us] 171 * Drop the page lock and turn IRQs back on 172 * 173 * At this point an existing IRQ may still be running but we can't 174 * get a new one 175 * 176 * Take the lock (so we know the IRQ has terminated) but don't mask 177 * the IRQs on the processor 178 * Set irqlock [for debug] 179 * 180 * Transmit (slow as ****) 181 * 182 * re-enable the IRQ 183 * 184 * 185 * We have to use disable_irq because otherwise you will get delayed 186 * interrupts on the APIC bus deadlocking the transmit path. 187 * 188 * Quite hairy but the chip simply wasn't designed for SMP and you can't 189 * even ACK an interrupt without risking corrupting other parallel 190 * activities on the chip." [lkml, 25 Jul 2007] 191 */ 192 193 194 195 /** 196 * ei_open - Open/initialize the board. 197 * @dev: network device to initialize 198 * 199 * This routine goes all-out, setting everything 200 * up anew at each open, even though many of these registers should only 201 * need to be set once at boot. 202 */ 203 static int __ei_open(struct net_device *dev) 204 { 205 unsigned long flags; 206 struct ei_device *ei_local = netdev_priv(dev); 207 208 if (dev->watchdog_timeo <= 0) 209 dev->watchdog_timeo = TX_TIMEOUT; 210 211 /* 212 * Grab the page lock so we own the register set, then call 213 * the init function. 214 */ 215 216 spin_lock_irqsave(&ei_local->page_lock, flags); 217 __NS8390_init(dev, 1); 218 /* Set the flag before we drop the lock, That way the IRQ arrives 219 after its set and we get no silly warnings */ 220 netif_start_queue(dev); 221 spin_unlock_irqrestore(&ei_local->page_lock, flags); 222 ei_local->irqlock = 0; 223 return 0; 224 } 225 226 /** 227 * ei_close - shut down network device 228 * @dev: network device to close 229 * 230 * Opposite of ei_open(). Only used when "ifconfig <devname> down" is done. 231 */ 232 static int __ei_close(struct net_device *dev) 233 { 234 struct ei_device *ei_local = netdev_priv(dev); 235 unsigned long flags; 236 237 /* 238 * Hold the page lock during close 239 */ 240 241 spin_lock_irqsave(&ei_local->page_lock, flags); 242 __NS8390_init(dev, 0); 243 spin_unlock_irqrestore(&ei_local->page_lock, flags); 244 netif_stop_queue(dev); 245 return 0; 246 } 247 248 /** 249 * ei_tx_timeout - handle transmit time out condition 250 * @dev: network device which has apparently fallen asleep 251 * 252 * Called by kernel when device never acknowledges a transmit has 253 * completed (or failed) - i.e. never posted a Tx related interrupt. 254 */ 255 256 static void __ei_tx_timeout(struct net_device *dev, unsigned int txqueue) 257 { 258 unsigned long e8390_base = dev->base_addr; 259 struct ei_device *ei_local = netdev_priv(dev); 260 int txsr, isr, tickssofar = jiffies - dev_trans_start(dev); 261 unsigned long flags; 262 263 dev->stats.tx_errors++; 264 265 spin_lock_irqsave(&ei_local->page_lock, flags); 266 txsr = ei_inb(e8390_base+EN0_TSR); 267 isr = ei_inb(e8390_base+EN0_ISR); 268 spin_unlock_irqrestore(&ei_local->page_lock, flags); 269 270 netdev_dbg(dev, "Tx timed out, %s TSR=%#2x, ISR=%#2x, t=%d\n", 271 (txsr & ENTSR_ABT) ? "excess collisions." : 272 (isr) ? "lost interrupt?" : "cable problem?", 273 txsr, isr, tickssofar); 274 275 if (!isr && !dev->stats.tx_packets) { 276 /* The 8390 probably hasn't gotten on the cable yet. */ 277 ei_local->interface_num ^= 1; /* Try a different xcvr. */ 278 } 279 280 /* Ugly but a reset can be slow, yet must be protected */ 281 282 disable_irq_nosync_lockdep(dev->irq); 283 spin_lock(&ei_local->page_lock); 284 285 /* Try to restart the card. Perhaps the user has fixed something. */ 286 ei_reset_8390(dev); 287 __NS8390_init(dev, 1); 288 289 spin_unlock(&ei_local->page_lock); 290 enable_irq_lockdep(dev->irq); 291 netif_wake_queue(dev); 292 } 293 294 /** 295 * ei_start_xmit - begin packet transmission 296 * @skb: packet to be sent 297 * @dev: network device to which packet is sent 298 * 299 * Sends a packet to an 8390 network device. 300 */ 301 302 static netdev_tx_t __ei_start_xmit(struct sk_buff *skb, 303 struct net_device *dev) 304 { 305 unsigned long e8390_base = dev->base_addr; 306 struct ei_device *ei_local = netdev_priv(dev); 307 int send_length = skb->len, output_page; 308 unsigned long flags; 309 char buf[ETH_ZLEN]; 310 char *data = skb->data; 311 312 if (skb->len < ETH_ZLEN) { 313 memset(buf, 0, ETH_ZLEN); /* more efficient than doing just the needed bits */ 314 memcpy(buf, data, skb->len); 315 send_length = ETH_ZLEN; 316 data = buf; 317 } 318 319 /* Mask interrupts from the ethercard. 320 SMP: We have to grab the lock here otherwise the IRQ handler 321 on another CPU can flip window and race the IRQ mask set. We end 322 up trashing the mcast filter not disabling irqs if we don't lock */ 323 324 spin_lock_irqsave(&ei_local->page_lock, flags); 325 ei_outb_p(0x00, e8390_base + EN0_IMR); 326 spin_unlock_irqrestore(&ei_local->page_lock, flags); 327 328 329 /* 330 * Slow phase with lock held. 331 */ 332 333 disable_irq_nosync_lockdep_irqsave(dev->irq, &flags); 334 335 spin_lock(&ei_local->page_lock); 336 337 ei_local->irqlock = 1; 338 339 /* 340 * We have two Tx slots available for use. Find the first free 341 * slot, and then perform some sanity checks. With two Tx bufs, 342 * you get very close to transmitting back-to-back packets. With 343 * only one Tx buf, the transmitter sits idle while you reload the 344 * card, leaving a substantial gap between each transmitted packet. 345 */ 346 347 if (ei_local->tx1 == 0) { 348 output_page = ei_local->tx_start_page; 349 ei_local->tx1 = send_length; 350 if ((netif_msg_tx_queued(ei_local)) && 351 ei_local->tx2 > 0) 352 netdev_dbg(dev, 353 "idle transmitter tx2=%d, lasttx=%d, txing=%d\n", 354 ei_local->tx2, ei_local->lasttx, ei_local->txing); 355 } else if (ei_local->tx2 == 0) { 356 output_page = ei_local->tx_start_page + TX_PAGES/2; 357 ei_local->tx2 = send_length; 358 if ((netif_msg_tx_queued(ei_local)) && 359 ei_local->tx1 > 0) 360 netdev_dbg(dev, 361 "idle transmitter, tx1=%d, lasttx=%d, txing=%d\n", 362 ei_local->tx1, ei_local->lasttx, ei_local->txing); 363 } else { /* We should never get here. */ 364 netif_dbg(ei_local, tx_err, dev, 365 "No Tx buffers free! tx1=%d tx2=%d last=%d\n", 366 ei_local->tx1, ei_local->tx2, ei_local->lasttx); 367 ei_local->irqlock = 0; 368 netif_stop_queue(dev); 369 ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR); 370 spin_unlock(&ei_local->page_lock); 371 enable_irq_lockdep_irqrestore(dev->irq, &flags); 372 dev->stats.tx_errors++; 373 return NETDEV_TX_BUSY; 374 } 375 376 /* 377 * Okay, now upload the packet and trigger a send if the transmitter 378 * isn't already sending. If it is busy, the interrupt handler will 379 * trigger the send later, upon receiving a Tx done interrupt. 380 */ 381 382 ei_block_output(dev, send_length, data, output_page); 383 384 if (!ei_local->txing) { 385 ei_local->txing = 1; 386 NS8390_trigger_send(dev, send_length, output_page); 387 if (output_page == ei_local->tx_start_page) { 388 ei_local->tx1 = -1; 389 ei_local->lasttx = -1; 390 } else { 391 ei_local->tx2 = -1; 392 ei_local->lasttx = -2; 393 } 394 } else 395 ei_local->txqueue++; 396 397 if (ei_local->tx1 && ei_local->tx2) 398 netif_stop_queue(dev); 399 else 400 netif_start_queue(dev); 401 402 /* Turn 8390 interrupts back on. */ 403 ei_local->irqlock = 0; 404 ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR); 405 406 spin_unlock(&ei_local->page_lock); 407 enable_irq_lockdep_irqrestore(dev->irq, &flags); 408 skb_tx_timestamp(skb); 409 dev_consume_skb_any(skb); 410 dev->stats.tx_bytes += send_length; 411 412 return NETDEV_TX_OK; 413 } 414 415 /** 416 * ei_interrupt - handle the interrupts from an 8390 417 * @irq: interrupt number 418 * @dev_id: a pointer to the net_device 419 * 420 * Handle the ether interface interrupts. We pull packets from 421 * the 8390 via the card specific functions and fire them at the networking 422 * stack. We also handle transmit completions and wake the transmit path if 423 * necessary. We also update the counters and do other housekeeping as 424 * needed. 425 */ 426 427 static irqreturn_t __ei_interrupt(int irq, void *dev_id) 428 { 429 struct net_device *dev = dev_id; 430 unsigned long e8390_base = dev->base_addr; 431 int interrupts, nr_serviced = 0; 432 struct ei_device *ei_local = netdev_priv(dev); 433 434 /* 435 * Protect the irq test too. 436 */ 437 438 spin_lock(&ei_local->page_lock); 439 440 if (ei_local->irqlock) { 441 /* 442 * This might just be an interrupt for a PCI device sharing 443 * this line 444 */ 445 netdev_err(dev, "Interrupted while interrupts are masked! isr=%#2x imr=%#2x\n", 446 ei_inb_p(e8390_base + EN0_ISR), 447 ei_inb_p(e8390_base + EN0_IMR)); 448 spin_unlock(&ei_local->page_lock); 449 return IRQ_NONE; 450 } 451 452 /* Change to page 0 and read the intr status reg. */ 453 ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD); 454 netif_dbg(ei_local, intr, dev, "interrupt(isr=%#2.2x)\n", 455 ei_inb_p(e8390_base + EN0_ISR)); 456 457 /* !!Assumption!! -- we stay in page 0. Don't break this. */ 458 while ((interrupts = ei_inb_p(e8390_base + EN0_ISR)) != 0 && 459 ++nr_serviced < MAX_SERVICE) { 460 if (!netif_running(dev)) { 461 netdev_warn(dev, "interrupt from stopped card\n"); 462 /* rmk - acknowledge the interrupts */ 463 ei_outb_p(interrupts, e8390_base + EN0_ISR); 464 interrupts = 0; 465 break; 466 } 467 if (interrupts & ENISR_OVER) 468 ei_rx_overrun(dev); 469 else if (interrupts & (ENISR_RX+ENISR_RX_ERR)) { 470 /* Got a good (?) packet. */ 471 ei_receive(dev); 472 } 473 /* Push the next to-transmit packet through. */ 474 if (interrupts & ENISR_TX) 475 ei_tx_intr(dev); 476 else if (interrupts & ENISR_TX_ERR) 477 ei_tx_err(dev); 478 479 if (interrupts & ENISR_COUNTERS) { 480 dev->stats.rx_frame_errors += ei_inb_p(e8390_base + EN0_COUNTER0); 481 dev->stats.rx_crc_errors += ei_inb_p(e8390_base + EN0_COUNTER1); 482 dev->stats.rx_missed_errors += ei_inb_p(e8390_base + EN0_COUNTER2); 483 ei_outb_p(ENISR_COUNTERS, e8390_base + EN0_ISR); /* Ack intr. */ 484 } 485 486 /* Ignore any RDC interrupts that make it back to here. */ 487 if (interrupts & ENISR_RDC) 488 ei_outb_p(ENISR_RDC, e8390_base + EN0_ISR); 489 490 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD); 491 } 492 493 if (interrupts && (netif_msg_intr(ei_local))) { 494 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD); 495 if (nr_serviced >= MAX_SERVICE) { 496 /* 0xFF is valid for a card removal */ 497 if (interrupts != 0xFF) 498 netdev_warn(dev, "Too much work at interrupt, status %#2.2x\n", 499 interrupts); 500 ei_outb_p(ENISR_ALL, e8390_base + EN0_ISR); /* Ack. most intrs. */ 501 } else { 502 netdev_warn(dev, "unknown interrupt %#2x\n", interrupts); 503 ei_outb_p(0xff, e8390_base + EN0_ISR); /* Ack. all intrs. */ 504 } 505 } 506 spin_unlock(&ei_local->page_lock); 507 return IRQ_RETVAL(nr_serviced > 0); 508 } 509 510 #ifdef CONFIG_NET_POLL_CONTROLLER 511 static void __ei_poll(struct net_device *dev) 512 { 513 disable_irq(dev->irq); 514 __ei_interrupt(dev->irq, dev); 515 enable_irq(dev->irq); 516 } 517 #endif 518 519 /** 520 * ei_tx_err - handle transmitter error 521 * @dev: network device which threw the exception 522 * 523 * A transmitter error has happened. Most likely excess collisions (which 524 * is a fairly normal condition). If the error is one where the Tx will 525 * have been aborted, we try and send another one right away, instead of 526 * letting the failed packet sit and collect dust in the Tx buffer. This 527 * is a much better solution as it avoids kernel based Tx timeouts, and 528 * an unnecessary card reset. 529 * 530 * Called with lock held. 531 */ 532 533 static void ei_tx_err(struct net_device *dev) 534 { 535 unsigned long e8390_base = dev->base_addr; 536 /* ei_local is used on some platforms via the EI_SHIFT macro */ 537 struct ei_device *ei_local __maybe_unused = netdev_priv(dev); 538 unsigned char txsr = ei_inb_p(e8390_base+EN0_TSR); 539 unsigned char tx_was_aborted = txsr & (ENTSR_ABT+ENTSR_FU); 540 541 #ifdef VERBOSE_ERROR_DUMP 542 netdev_dbg(dev, "transmitter error (%#2x):", txsr); 543 if (txsr & ENTSR_ABT) 544 pr_cont(" excess-collisions "); 545 if (txsr & ENTSR_ND) 546 pr_cont(" non-deferral "); 547 if (txsr & ENTSR_CRS) 548 pr_cont(" lost-carrier "); 549 if (txsr & ENTSR_FU) 550 pr_cont(" FIFO-underrun "); 551 if (txsr & ENTSR_CDH) 552 pr_cont(" lost-heartbeat "); 553 pr_cont("\n"); 554 #endif 555 556 ei_outb_p(ENISR_TX_ERR, e8390_base + EN0_ISR); /* Ack intr. */ 557 558 if (tx_was_aborted) 559 ei_tx_intr(dev); 560 else { 561 dev->stats.tx_errors++; 562 if (txsr & ENTSR_CRS) 563 dev->stats.tx_carrier_errors++; 564 if (txsr & ENTSR_CDH) 565 dev->stats.tx_heartbeat_errors++; 566 if (txsr & ENTSR_OWC) 567 dev->stats.tx_window_errors++; 568 } 569 } 570 571 /** 572 * ei_tx_intr - transmit interrupt handler 573 * @dev: network device for which tx intr is handled 574 * 575 * We have finished a transmit: check for errors and then trigger the next 576 * packet to be sent. Called with lock held. 577 */ 578 579 static void ei_tx_intr(struct net_device *dev) 580 { 581 unsigned long e8390_base = dev->base_addr; 582 struct ei_device *ei_local = netdev_priv(dev); 583 int status = ei_inb(e8390_base + EN0_TSR); 584 585 ei_outb_p(ENISR_TX, e8390_base + EN0_ISR); /* Ack intr. */ 586 587 /* 588 * There are two Tx buffers, see which one finished, and trigger 589 * the send of another one if it exists. 590 */ 591 ei_local->txqueue--; 592 593 if (ei_local->tx1 < 0) { 594 if (ei_local->lasttx != 1 && ei_local->lasttx != -1) 595 pr_err("%s: bogus last_tx_buffer %d, tx1=%d\n", 596 ei_local->name, ei_local->lasttx, ei_local->tx1); 597 ei_local->tx1 = 0; 598 if (ei_local->tx2 > 0) { 599 ei_local->txing = 1; 600 NS8390_trigger_send(dev, ei_local->tx2, ei_local->tx_start_page + 6); 601 netif_trans_update(dev); 602 ei_local->tx2 = -1; 603 ei_local->lasttx = 2; 604 } else { 605 ei_local->lasttx = 20; 606 ei_local->txing = 0; 607 } 608 } else if (ei_local->tx2 < 0) { 609 if (ei_local->lasttx != 2 && ei_local->lasttx != -2) 610 pr_err("%s: bogus last_tx_buffer %d, tx2=%d\n", 611 ei_local->name, ei_local->lasttx, ei_local->tx2); 612 ei_local->tx2 = 0; 613 if (ei_local->tx1 > 0) { 614 ei_local->txing = 1; 615 NS8390_trigger_send(dev, ei_local->tx1, ei_local->tx_start_page); 616 netif_trans_update(dev); 617 ei_local->tx1 = -1; 618 ei_local->lasttx = 1; 619 } else { 620 ei_local->lasttx = 10; 621 ei_local->txing = 0; 622 } 623 } /* else 624 netdev_warn(dev, "unexpected TX-done interrupt, lasttx=%d\n", 625 ei_local->lasttx); 626 */ 627 628 /* Minimize Tx latency: update the statistics after we restart TXing. */ 629 if (status & ENTSR_COL) 630 dev->stats.collisions++; 631 if (status & ENTSR_PTX) 632 dev->stats.tx_packets++; 633 else { 634 dev->stats.tx_errors++; 635 if (status & ENTSR_ABT) { 636 dev->stats.tx_aborted_errors++; 637 dev->stats.collisions += 16; 638 } 639 if (status & ENTSR_CRS) 640 dev->stats.tx_carrier_errors++; 641 if (status & ENTSR_FU) 642 dev->stats.tx_fifo_errors++; 643 if (status & ENTSR_CDH) 644 dev->stats.tx_heartbeat_errors++; 645 if (status & ENTSR_OWC) 646 dev->stats.tx_window_errors++; 647 } 648 netif_wake_queue(dev); 649 } 650 651 /** 652 * ei_receive - receive some packets 653 * @dev: network device with which receive will be run 654 * 655 * We have a good packet(s), get it/them out of the buffers. 656 * Called with lock held. 657 */ 658 659 static void ei_receive(struct net_device *dev) 660 { 661 unsigned long e8390_base = dev->base_addr; 662 struct ei_device *ei_local = netdev_priv(dev); 663 unsigned char rxing_page, this_frame, next_frame; 664 unsigned short current_offset; 665 int rx_pkt_count = 0; 666 struct e8390_pkt_hdr rx_frame; 667 int num_rx_pages = ei_local->stop_page-ei_local->rx_start_page; 668 669 while (++rx_pkt_count < 10) { 670 int pkt_len, pkt_stat; 671 672 /* Get the rx page (incoming packet pointer). */ 673 ei_outb_p(E8390_NODMA+E8390_PAGE1, e8390_base + E8390_CMD); 674 rxing_page = ei_inb_p(e8390_base + EN1_CURPAG); 675 ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD); 676 677 /* Remove one frame from the ring. Boundary is always a page behind. */ 678 this_frame = ei_inb_p(e8390_base + EN0_BOUNDARY) + 1; 679 if (this_frame >= ei_local->stop_page) 680 this_frame = ei_local->rx_start_page; 681 682 /* Someday we'll omit the previous, iff we never get this message. 683 (There is at least one clone claimed to have a problem.) 684 685 Keep quiet if it looks like a card removal. One problem here 686 is that some clones crash in roughly the same way. 687 */ 688 if ((netif_msg_rx_status(ei_local)) && 689 this_frame != ei_local->current_page && 690 (this_frame != 0x0 || rxing_page != 0xFF)) 691 netdev_err(dev, 692 "mismatched read page pointers %2x vs %2x\n", 693 this_frame, ei_local->current_page); 694 695 if (this_frame == rxing_page) /* Read all the frames? */ 696 break; /* Done for now */ 697 698 current_offset = this_frame << 8; 699 ei_get_8390_hdr(dev, &rx_frame, this_frame); 700 701 pkt_len = rx_frame.count - sizeof(struct e8390_pkt_hdr); 702 pkt_stat = rx_frame.status; 703 704 next_frame = this_frame + 1 + ((pkt_len+4)>>8); 705 706 /* Check for bogosity warned by 3c503 book: the status byte is never 707 written. This happened a lot during testing! This code should be 708 cleaned up someday. */ 709 if (rx_frame.next != next_frame && 710 rx_frame.next != next_frame + 1 && 711 rx_frame.next != next_frame - num_rx_pages && 712 rx_frame.next != next_frame + 1 - num_rx_pages) { 713 ei_local->current_page = rxing_page; 714 ei_outb(ei_local->current_page-1, e8390_base+EN0_BOUNDARY); 715 dev->stats.rx_errors++; 716 continue; 717 } 718 719 if (pkt_len < 60 || pkt_len > 1518) { 720 netif_dbg(ei_local, rx_status, dev, 721 "bogus packet size: %d, status=%#2x nxpg=%#2x\n", 722 rx_frame.count, rx_frame.status, 723 rx_frame.next); 724 dev->stats.rx_errors++; 725 dev->stats.rx_length_errors++; 726 } else if ((pkt_stat & 0x0F) == ENRSR_RXOK) { 727 struct sk_buff *skb; 728 729 skb = netdev_alloc_skb(dev, pkt_len + 2); 730 if (skb == NULL) { 731 netif_err(ei_local, rx_err, dev, 732 "Couldn't allocate a sk_buff of size %d\n", 733 pkt_len); 734 dev->stats.rx_dropped++; 735 break; 736 } else { 737 skb_reserve(skb, 2); /* IP headers on 16 byte boundaries */ 738 skb_put(skb, pkt_len); /* Make room */ 739 ei_block_input(dev, pkt_len, skb, current_offset + sizeof(rx_frame)); 740 skb->protocol = eth_type_trans(skb, dev); 741 if (!skb_defer_rx_timestamp(skb)) 742 netif_rx(skb); 743 dev->stats.rx_packets++; 744 dev->stats.rx_bytes += pkt_len; 745 if (pkt_stat & ENRSR_PHY) 746 dev->stats.multicast++; 747 } 748 } else { 749 netif_err(ei_local, rx_err, dev, 750 "bogus packet: status=%#2x nxpg=%#2x size=%d\n", 751 rx_frame.status, rx_frame.next, 752 rx_frame.count); 753 dev->stats.rx_errors++; 754 /* NB: The NIC counts CRC, frame and missed errors. */ 755 if (pkt_stat & ENRSR_FO) 756 dev->stats.rx_fifo_errors++; 757 } 758 next_frame = rx_frame.next; 759 760 /* This _should_ never happen: it's here for avoiding bad clones. */ 761 if (next_frame >= ei_local->stop_page) { 762 netdev_notice(dev, "next frame inconsistency, %#2x\n", 763 next_frame); 764 next_frame = ei_local->rx_start_page; 765 } 766 ei_local->current_page = next_frame; 767 ei_outb_p(next_frame-1, e8390_base+EN0_BOUNDARY); 768 } 769 770 /* We used to also ack ENISR_OVER here, but that would sometimes mask 771 a real overrun, leaving the 8390 in a stopped state with rec'vr off. */ 772 ei_outb_p(ENISR_RX+ENISR_RX_ERR, e8390_base+EN0_ISR); 773 } 774 775 /** 776 * ei_rx_overrun - handle receiver overrun 777 * @dev: network device which threw exception 778 * 779 * We have a receiver overrun: we have to kick the 8390 to get it started 780 * again. Problem is that you have to kick it exactly as NS prescribes in 781 * the updated datasheets, or "the NIC may act in an unpredictable manner." 782 * This includes causing "the NIC to defer indefinitely when it is stopped 783 * on a busy network." Ugh. 784 * Called with lock held. Don't call this with the interrupts off or your 785 * computer will hate you - it takes 10ms or so. 786 */ 787 788 static void ei_rx_overrun(struct net_device *dev) 789 { 790 unsigned long e8390_base = dev->base_addr; 791 unsigned char was_txing, must_resend = 0; 792 /* ei_local is used on some platforms via the EI_SHIFT macro */ 793 struct ei_device *ei_local __maybe_unused = netdev_priv(dev); 794 795 /* 796 * Record whether a Tx was in progress and then issue the 797 * stop command. 798 */ 799 was_txing = ei_inb_p(e8390_base+E8390_CMD) & E8390_TRANS; 800 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); 801 802 netif_dbg(ei_local, rx_err, dev, "Receiver overrun\n"); 803 dev->stats.rx_over_errors++; 804 805 /* 806 * Wait a full Tx time (1.2ms) + some guard time, NS says 1.6ms total. 807 * Early datasheets said to poll the reset bit, but now they say that 808 * it "is not a reliable indicator and subsequently should be ignored." 809 * We wait at least 10ms. 810 */ 811 812 mdelay(10); 813 814 /* 815 * Reset RBCR[01] back to zero as per magic incantation. 816 */ 817 ei_outb_p(0x00, e8390_base+EN0_RCNTLO); 818 ei_outb_p(0x00, e8390_base+EN0_RCNTHI); 819 820 /* 821 * See if any Tx was interrupted or not. According to NS, this 822 * step is vital, and skipping it will cause no end of havoc. 823 */ 824 825 if (was_txing) { 826 unsigned char tx_completed = ei_inb_p(e8390_base+EN0_ISR) & (ENISR_TX+ENISR_TX_ERR); 827 if (!tx_completed) 828 must_resend = 1; 829 } 830 831 /* 832 * Have to enter loopback mode and then restart the NIC before 833 * you are allowed to slurp packets up off the ring. 834 */ 835 ei_outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); 836 ei_outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START, e8390_base + E8390_CMD); 837 838 /* 839 * Clear the Rx ring of all the debris, and ack the interrupt. 840 */ 841 ei_receive(dev); 842 ei_outb_p(ENISR_OVER, e8390_base+EN0_ISR); 843 844 /* 845 * Leave loopback mode, and resend any packet that got stopped. 846 */ 847 ei_outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR); 848 if (must_resend) 849 ei_outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START + E8390_TRANS, e8390_base + E8390_CMD); 850 } 851 852 /* 853 * Collect the stats. This is called unlocked and from several contexts. 854 */ 855 856 static struct net_device_stats *__ei_get_stats(struct net_device *dev) 857 { 858 unsigned long ioaddr = dev->base_addr; 859 struct ei_device *ei_local = netdev_priv(dev); 860 unsigned long flags; 861 862 /* If the card is stopped, just return the present stats. */ 863 if (!netif_running(dev)) 864 return &dev->stats; 865 866 spin_lock_irqsave(&ei_local->page_lock, flags); 867 /* Read the counter registers, assuming we are in page 0. */ 868 dev->stats.rx_frame_errors += ei_inb_p(ioaddr + EN0_COUNTER0); 869 dev->stats.rx_crc_errors += ei_inb_p(ioaddr + EN0_COUNTER1); 870 dev->stats.rx_missed_errors += ei_inb_p(ioaddr + EN0_COUNTER2); 871 spin_unlock_irqrestore(&ei_local->page_lock, flags); 872 873 return &dev->stats; 874 } 875 876 /* 877 * Form the 64 bit 8390 multicast table from the linked list of addresses 878 * associated with this dev structure. 879 */ 880 881 static inline void make_mc_bits(u8 *bits, struct net_device *dev) 882 { 883 struct netdev_hw_addr *ha; 884 885 netdev_for_each_mc_addr(ha, dev) { 886 u32 crc = ether_crc(ETH_ALEN, ha->addr); 887 /* 888 * The 8390 uses the 6 most significant bits of the 889 * CRC to index the multicast table. 890 */ 891 bits[crc>>29] |= (1<<((crc>>26)&7)); 892 } 893 } 894 895 /** 896 * do_set_multicast_list - set/clear multicast filter 897 * @dev: net device for which multicast filter is adjusted 898 * 899 * Set or clear the multicast filter for this adaptor. May be called 900 * from a BH in 2.1.x. Must be called with lock held. 901 */ 902 903 static void do_set_multicast_list(struct net_device *dev) 904 { 905 unsigned long e8390_base = dev->base_addr; 906 int i; 907 struct ei_device *ei_local = netdev_priv(dev); 908 909 if (!(dev->flags&(IFF_PROMISC|IFF_ALLMULTI))) { 910 memset(ei_local->mcfilter, 0, 8); 911 if (!netdev_mc_empty(dev)) 912 make_mc_bits(ei_local->mcfilter, dev); 913 } else 914 memset(ei_local->mcfilter, 0xFF, 8); /* mcast set to accept-all */ 915 916 /* 917 * DP8390 manuals don't specify any magic sequence for altering 918 * the multicast regs on an already running card. To be safe, we 919 * ensure multicast mode is off prior to loading up the new hash 920 * table. If this proves to be not enough, we can always resort 921 * to stopping the NIC, loading the table and then restarting. 922 * 923 * Bug Alert! The MC regs on the SMC 83C690 (SMC Elite and SMC 924 * Elite16) appear to be write-only. The NS 8390 data sheet lists 925 * them as r/w so this is a bug. The SMC 83C790 (SMC Ultra and 926 * Ultra32 EISA) appears to have this bug fixed. 927 */ 928 929 if (netif_running(dev)) 930 ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR); 931 ei_outb_p(E8390_NODMA + E8390_PAGE1, e8390_base + E8390_CMD); 932 for (i = 0; i < 8; i++) { 933 ei_outb_p(ei_local->mcfilter[i], e8390_base + EN1_MULT_SHIFT(i)); 934 #ifndef BUG_83C690 935 if (ei_inb_p(e8390_base + EN1_MULT_SHIFT(i)) != ei_local->mcfilter[i]) 936 netdev_err(dev, "Multicast filter read/write mismap %d\n", 937 i); 938 #endif 939 } 940 ei_outb_p(E8390_NODMA + E8390_PAGE0, e8390_base + E8390_CMD); 941 942 if (dev->flags&IFF_PROMISC) 943 ei_outb_p(E8390_RXCONFIG | 0x18, e8390_base + EN0_RXCR); 944 else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev)) 945 ei_outb_p(E8390_RXCONFIG | 0x08, e8390_base + EN0_RXCR); 946 else 947 ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR); 948 } 949 950 /* 951 * Called without lock held. This is invoked from user context and may 952 * be parallel to just about everything else. Its also fairly quick and 953 * not called too often. Must protect against both bh and irq users 954 */ 955 956 static void __ei_set_multicast_list(struct net_device *dev) 957 { 958 unsigned long flags; 959 struct ei_device *ei_local = netdev_priv(dev); 960 961 spin_lock_irqsave(&ei_local->page_lock, flags); 962 do_set_multicast_list(dev); 963 spin_unlock_irqrestore(&ei_local->page_lock, flags); 964 } 965 966 /** 967 * ethdev_setup - init rest of 8390 device struct 968 * @dev: network device structure to init 969 * 970 * Initialize the rest of the 8390 device structure. Do NOT __init 971 * this, as it is used by 8390 based modular drivers too. 972 */ 973 974 static void ethdev_setup(struct net_device *dev) 975 { 976 struct ei_device *ei_local = netdev_priv(dev); 977 978 ether_setup(dev); 979 980 spin_lock_init(&ei_local->page_lock); 981 982 ei_local->msg_enable = netif_msg_init(msg_enable, default_msg_level); 983 984 if (netif_msg_drv(ei_local) && (version_printed++ == 0)) 985 pr_info("%s", version); 986 } 987 988 /** 989 * alloc_ei_netdev - alloc_etherdev counterpart for 8390 990 * @size: extra bytes to allocate 991 * 992 * Allocate 8390-specific net_device. 993 */ 994 static struct net_device *____alloc_ei_netdev(int size) 995 { 996 return alloc_netdev(sizeof(struct ei_device) + size, "eth%d", 997 NET_NAME_UNKNOWN, ethdev_setup); 998 } 999 1000 1001 1002 1003 /* This page of functions should be 8390 generic */ 1004 /* Follow National Semi's recommendations for initializing the "NIC". */ 1005 1006 /** 1007 * NS8390_init - initialize 8390 hardware 1008 * @dev: network device to initialize 1009 * @startp: boolean. non-zero value to initiate chip processing 1010 * 1011 * Must be called with lock held. 1012 */ 1013 1014 static void __NS8390_init(struct net_device *dev, int startp) 1015 { 1016 unsigned long e8390_base = dev->base_addr; 1017 struct ei_device *ei_local = netdev_priv(dev); 1018 int i; 1019 int endcfg = ei_local->word16 1020 ? (0x48 | ENDCFG_WTS | (ei_local->bigendian ? ENDCFG_BOS : 0)) 1021 : 0x48; 1022 1023 BUILD_BUG_ON(sizeof(struct e8390_pkt_hdr) != 4); 1024 /* Follow National Semi's recommendations for initing the DP83902. */ 1025 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); /* 0x21 */ 1026 ei_outb_p(endcfg, e8390_base + EN0_DCFG); /* 0x48 or 0x49 */ 1027 /* Clear the remote byte count registers. */ 1028 ei_outb_p(0x00, e8390_base + EN0_RCNTLO); 1029 ei_outb_p(0x00, e8390_base + EN0_RCNTHI); 1030 /* Set to monitor and loopback mode -- this is vital!. */ 1031 ei_outb_p(E8390_RXOFF, e8390_base + EN0_RXCR); /* 0x20 */ 1032 ei_outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); /* 0x02 */ 1033 /* Set the transmit page and receive ring. */ 1034 ei_outb_p(ei_local->tx_start_page, e8390_base + EN0_TPSR); 1035 ei_local->tx1 = ei_local->tx2 = 0; 1036 ei_outb_p(ei_local->rx_start_page, e8390_base + EN0_STARTPG); 1037 ei_outb_p(ei_local->stop_page-1, e8390_base + EN0_BOUNDARY); /* 3c503 says 0x3f,NS0x26*/ 1038 ei_local->current_page = ei_local->rx_start_page; /* assert boundary+1 */ 1039 ei_outb_p(ei_local->stop_page, e8390_base + EN0_STOPPG); 1040 /* Clear the pending interrupts and mask. */ 1041 ei_outb_p(0xFF, e8390_base + EN0_ISR); 1042 ei_outb_p(0x00, e8390_base + EN0_IMR); 1043 1044 /* Copy the station address into the DS8390 registers. */ 1045 1046 ei_outb_p(E8390_NODMA + E8390_PAGE1 + E8390_STOP, e8390_base+E8390_CMD); /* 0x61 */ 1047 for (i = 0; i < 6; i++) { 1048 ei_outb_p(dev->dev_addr[i], e8390_base + EN1_PHYS_SHIFT(i)); 1049 if ((netif_msg_probe(ei_local)) && 1050 ei_inb_p(e8390_base + EN1_PHYS_SHIFT(i)) != dev->dev_addr[i]) 1051 netdev_err(dev, 1052 "Hw. address read/write mismap %d\n", i); 1053 } 1054 1055 ei_outb_p(ei_local->rx_start_page, e8390_base + EN1_CURPAG); 1056 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); 1057 1058 ei_local->tx1 = ei_local->tx2 = 0; 1059 ei_local->txing = 0; 1060 1061 if (startp) { 1062 ei_outb_p(0xff, e8390_base + EN0_ISR); 1063 ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR); 1064 ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base+E8390_CMD); 1065 ei_outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR); /* xmit on. */ 1066 /* 3c503 TechMan says rxconfig only after the NIC is started. */ 1067 ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR); /* rx on, */ 1068 do_set_multicast_list(dev); /* (re)load the mcast table */ 1069 } 1070 } 1071 1072 /* Trigger a transmit start, assuming the length is valid. 1073 Always called with the page lock held */ 1074 1075 static void NS8390_trigger_send(struct net_device *dev, unsigned int length, 1076 int start_page) 1077 { 1078 unsigned long e8390_base = dev->base_addr; 1079 struct ei_device *ei_local __attribute((unused)) = netdev_priv(dev); 1080 1081 ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base+E8390_CMD); 1082 1083 if (ei_inb_p(e8390_base + E8390_CMD) & E8390_TRANS) { 1084 netdev_warn(dev, "trigger_send() called with the transmitter busy\n"); 1085 return; 1086 } 1087 ei_outb_p(length & 0xff, e8390_base + EN0_TCNTLO); 1088 ei_outb_p(length >> 8, e8390_base + EN0_TCNTHI); 1089 ei_outb_p(start_page, e8390_base + EN0_TPSR); 1090 ei_outb_p(E8390_NODMA+E8390_TRANS+E8390_START, e8390_base+E8390_CMD); 1091 } 1092