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1/* mac89x0.c: A Crystal Semiconductor CS89[02]0 driver for linux. */2/*3 Written 1996 by Russell Nelson, with reference to skeleton.c4 written 1993-1994 by Donald Becker.5 6 This software may be used and distributed according to the terms7 of the GNU General Public License, incorporated herein by reference.8 9 The author may be reached at nelson@crynwr.com, Crynwr10 Software, 11 Grant St., Potsdam, NY 1367611 12 Changelog:13 14 Mike Cruse : mcruse@cti-ltd.com15 : Changes for Linux 2.0 compatibility.16 : Added dev_id parameter in net_interrupt(),17 : request_irq() and free_irq(). Just NULL for now.18 19 Mike Cruse : Added MOD_INC_USE_COUNT and MOD_DEC_USE_COUNT macros20 : in net_open() and net_close() so kerneld would know21 : that the module is in use and wouldn't eject the22 : driver prematurely.23 24 Mike Cruse : Rewrote init_module() and cleanup_module using 8390.c25 : as an example. Disabled autoprobing in init_module(),26 : not a good thing to do to other devices while Linux27 : is running from all accounts.28 29 Alan Cox : Removed 1.2 support, added 2.1 extra counters.30 31 David Huggins-Daines <dhd@debian.org>32 33 Split this off into mac89x0.c, and gutted it of all parts which are34 not relevant to the existing CS8900 cards on the Macintosh35 (i.e. basically the Daynaport CS and LC cards). To be precise:36 37 * Removed all the media-detection stuff, because these cards are38 TP-only.39 40 * Lobotomized the ISA interrupt bogosity, because these cards use41 a hardwired NuBus interrupt and a magic ISAIRQ value in the card.42 43 * Basically eliminated everything not relevant to getting the44 cards minimally functioning on the Macintosh.45 46 I might add that these cards are badly designed even from the Mac47 standpoint, in that Dayna, in their infinite wisdom, used NuBus slot48 I/O space and NuBus interrupts for these cards, but neglected to49 provide anything even remotely resembling a NuBus ROM. Therefore we50 have to probe for them in a brain-damaged ISA-like fashion.51 52 Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 11/01/200153 check kmalloc and release the allocated memory on failure in54 mac89x0_probe and in init_module55 use local_irq_{save,restore}(flags) in net_get_stat, not just56 local_irq_{dis,en}able()57*/58 59#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt60 61static const char version[] =62"cs89x0.c:v1.02 11/26/96 Russell Nelson <nelson@crynwr.com>\n";63 64#include <linux/module.h>65 66/*67 Sources:68 69 Crynwr packet driver epktisa.70 71 Crystal Semiconductor data sheets.72 73*/74 75#include <linux/kernel.h>76#include <linux/types.h>77#include <linux/fcntl.h>78#include <linux/interrupt.h>79#include <linux/ioport.h>80#include <linux/in.h>81#include <linux/string.h>82#include <linux/nubus.h>83#include <linux/errno.h>84#include <linux/init.h>85#include <linux/netdevice.h>86#include <linux/platform_device.h>87#include <linux/etherdevice.h>88#include <linux/skbuff.h>89#include <linux/delay.h>90#include <linux/bitops.h>91#include <linux/gfp.h>92 93#include <asm/io.h>94#include <asm/hwtest.h>95#include <asm/macints.h>96 97#include "cs89x0.h"98 99static int debug = -1;100module_param(debug, int, 0);101MODULE_PARM_DESC(debug, "debug message level");102 103/* Information that need to be kept for each board. */104struct net_local {105 int msg_enable;106 int chip_type; /* one of: CS8900, CS8920, CS8920M */107 char chip_revision; /* revision letter of the chip ('A'...) */108 int send_cmd; /* the propercommand used to send a packet. */109 int rx_mode;110 int curr_rx_cfg;111 int send_underrun; /* keep track of how many underruns in a row we get */112};113 114/* Index to functions, as function prototypes. */115static int net_open(struct net_device *dev);116static netdev_tx_t net_send_packet(struct sk_buff *skb, struct net_device *dev);117static irqreturn_t net_interrupt(int irq, void *dev_id);118static void set_multicast_list(struct net_device *dev);119static void net_rx(struct net_device *dev);120static int net_close(struct net_device *dev);121static struct net_device_stats *net_get_stats(struct net_device *dev);122static int set_mac_address(struct net_device *dev, void *addr);123 124/* For reading/writing registers ISA-style */125static inline int126readreg_io(struct net_device *dev, int portno)127{128 nubus_writew(swab16(portno), dev->base_addr + ADD_PORT);129 return swab16(nubus_readw(dev->base_addr + DATA_PORT));130}131 132static inline void133writereg_io(struct net_device *dev, int portno, int value)134{135 nubus_writew(swab16(portno), dev->base_addr + ADD_PORT);136 nubus_writew(swab16(value), dev->base_addr + DATA_PORT);137}138 139/* These are for reading/writing registers in shared memory */140static inline int141readreg(struct net_device *dev, int portno)142{143 return swab16(nubus_readw(dev->mem_start + portno));144}145 146static inline void147writereg(struct net_device *dev, int portno, int value)148{149 nubus_writew(swab16(value), dev->mem_start + portno);150}151 152static const struct net_device_ops mac89x0_netdev_ops = {153 .ndo_open = net_open,154 .ndo_stop = net_close,155 .ndo_start_xmit = net_send_packet,156 .ndo_get_stats = net_get_stats,157 .ndo_set_rx_mode = set_multicast_list,158 .ndo_set_mac_address = set_mac_address,159 .ndo_validate_addr = eth_validate_addr,160};161 162/* Probe for the CS8900 card in slot E. We won't bother looking163 anywhere else until we have a really good reason to do so. */164static int mac89x0_device_probe(struct platform_device *pdev)165{166 struct net_device *dev;167 struct net_local *lp;168 int i, slot;169 unsigned rev_type = 0;170 unsigned long ioaddr;171 unsigned short sig;172 int err = -ENODEV;173 struct nubus_rsrc *fres;174 175 dev = alloc_etherdev(sizeof(struct net_local));176 if (!dev)177 return -ENOMEM;178 179 /* We might have to parameterize this later */180 slot = 0xE;181 /* Get out now if there's a real NuBus card in slot E */182 for_each_func_rsrc(fres)183 if (fres->board->slot == slot)184 goto out;185 186 /* The pseudo-ISA bits always live at offset 0x300 (gee,187 wonder why...) */188 ioaddr = (unsigned long)189 nubus_slot_addr(slot) | (((slot&0xf) << 20) + DEFAULTIOBASE);190 {191 int card_present;192 193 card_present = (hwreg_present((void *)ioaddr + 4) &&194 hwreg_present((void *)ioaddr + DATA_PORT));195 if (!card_present)196 goto out;197 }198 199 nubus_writew(0, ioaddr + ADD_PORT);200 sig = nubus_readw(ioaddr + DATA_PORT);201 if (sig != swab16(CHIP_EISA_ID_SIG))202 goto out;203 204 SET_NETDEV_DEV(dev, &pdev->dev);205 206 /* Initialize the net_device structure. */207 lp = netdev_priv(dev);208 209 lp->msg_enable = netif_msg_init(debug, 0);210 211 /* Fill in the 'dev' fields. */212 dev->base_addr = ioaddr;213 dev->mem_start = (unsigned long)214 nubus_slot_addr(slot) | (((slot&0xf) << 20) + MMIOBASE);215 dev->mem_end = dev->mem_start + 0x1000;216 217 /* Turn on shared memory */218 writereg_io(dev, PP_BusCTL, MEMORY_ON);219 220 /* get the chip type */221 rev_type = readreg(dev, PRODUCT_ID_ADD);222 lp->chip_type = rev_type &~ REVISON_BITS;223 lp->chip_revision = ((rev_type & REVISON_BITS) >> 8) + 'A';224 225 /* Check the chip type and revision in order to set the correct send command226 CS8920 revision C and CS8900 revision F can use the faster send. */227 lp->send_cmd = TX_AFTER_381;228 if (lp->chip_type == CS8900 && lp->chip_revision >= 'F')229 lp->send_cmd = TX_NOW;230 if (lp->chip_type != CS8900 && lp->chip_revision >= 'C')231 lp->send_cmd = TX_NOW;232 233 netif_dbg(lp, drv, dev, "%s", version);234 235 pr_info("cs89%c0%s rev %c found at %#8lx\n",236 lp->chip_type == CS8900 ? '0' : '2',237 lp->chip_type == CS8920M ? "M" : "",238 lp->chip_revision, dev->base_addr);239 240 /* Try to read the MAC address */241 if ((readreg(dev, PP_SelfST) & (EEPROM_PRESENT | EEPROM_OK)) == 0) {242 pr_info("No EEPROM, giving up now.\n");243 goto out1;244 } else {245 u8 addr[ETH_ALEN];246 247 for (i = 0; i < ETH_ALEN; i += 2) {248 /* Big-endian (why??!) */249 unsigned short s = readreg(dev, PP_IA + i);250 addr[i] = s >> 8;251 addr[i+1] = s & 0xff;252 }253 eth_hw_addr_set(dev, addr);254 }255 256 dev->irq = SLOT2IRQ(slot);257 258 /* print the IRQ and ethernet address. */259 260 pr_info("MAC %pM, IRQ %d\n", dev->dev_addr, dev->irq);261 262 dev->netdev_ops = &mac89x0_netdev_ops;263 264 err = register_netdev(dev);265 if (err)266 goto out1;267 268 platform_set_drvdata(pdev, dev);269 return 0;270out1:271 nubus_writew(0, dev->base_addr + ADD_PORT);272out:273 free_netdev(dev);274 return err;275}276 277/* Open/initialize the board. This is called (in the current kernel)278 sometime after booting when the 'ifconfig' program is run.279 280 This routine should set everything up anew at each open, even281 registers that "should" only need to be set once at boot, so that282 there is non-reboot way to recover if something goes wrong.283 */284static int285net_open(struct net_device *dev)286{287 struct net_local *lp = netdev_priv(dev);288 int i;289 290 /* Disable the interrupt for now */291 writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL) & ~ENABLE_IRQ);292 293 /* Grab the interrupt */294 if (request_irq(dev->irq, net_interrupt, 0, "cs89x0", dev))295 return -EAGAIN;296 297 /* Set up the IRQ - Apparently magic */298 if (lp->chip_type == CS8900)299 writereg(dev, PP_CS8900_ISAINT, 0);300 else301 writereg(dev, PP_CS8920_ISAINT, 0);302 303 /* set the Ethernet address */304 for (i=0; i < ETH_ALEN/2; i++)305 writereg(dev, PP_IA+i*2, dev->dev_addr[i*2] | (dev->dev_addr[i*2+1] << 8));306 307 /* Turn on both receive and transmit operations */308 writereg(dev, PP_LineCTL, readreg(dev, PP_LineCTL) | SERIAL_RX_ON | SERIAL_TX_ON);309 310 /* Receive only error free packets addressed to this card */311 lp->rx_mode = 0;312 writereg(dev, PP_RxCTL, DEF_RX_ACCEPT);313 314 lp->curr_rx_cfg = RX_OK_ENBL | RX_CRC_ERROR_ENBL;315 316 writereg(dev, PP_RxCFG, lp->curr_rx_cfg);317 318 writereg(dev, PP_TxCFG, TX_LOST_CRS_ENBL | TX_SQE_ERROR_ENBL | TX_OK_ENBL |319 TX_LATE_COL_ENBL | TX_JBR_ENBL | TX_ANY_COL_ENBL | TX_16_COL_ENBL);320 321 writereg(dev, PP_BufCFG, READY_FOR_TX_ENBL | RX_MISS_COUNT_OVRFLOW_ENBL |322 TX_COL_COUNT_OVRFLOW_ENBL | TX_UNDERRUN_ENBL);323 324 /* now that we've got our act together, enable everything */325 writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL) | ENABLE_IRQ);326 netif_start_queue(dev);327 return 0;328}329 330static netdev_tx_t331net_send_packet(struct sk_buff *skb, struct net_device *dev)332{333 struct net_local *lp = netdev_priv(dev);334 unsigned long flags;335 336 netif_dbg(lp, tx_queued, dev, "sent %d byte packet of type %x\n",337 skb->len, skb->data[ETH_ALEN + ETH_ALEN] << 8 |338 skb->data[ETH_ALEN + ETH_ALEN + 1]);339 340 /* keep the upload from being interrupted, since we341 ask the chip to start transmitting before the342 whole packet has been completely uploaded. */343 local_irq_save(flags);344 netif_stop_queue(dev);345 346 /* initiate a transmit sequence */347 writereg(dev, PP_TxCMD, lp->send_cmd);348 writereg(dev, PP_TxLength, skb->len);349 350 /* Test to see if the chip has allocated memory for the packet */351 if ((readreg(dev, PP_BusST) & READY_FOR_TX_NOW) == 0) {352 /* Gasp! It hasn't. But that shouldn't happen since353 we're waiting for TxOk, so return 1 and requeue this packet. */354 local_irq_restore(flags);355 return NETDEV_TX_BUSY;356 }357 358 /* Write the contents of the packet */359 skb_copy_from_linear_data(skb, (void *)(dev->mem_start + PP_TxFrame),360 skb->len+1);361 362 local_irq_restore(flags);363 dev_kfree_skb (skb);364 365 return NETDEV_TX_OK;366}367 368/* The typical workload of the driver:369 Handle the network interface interrupts. */370static irqreturn_t net_interrupt(int irq, void *dev_id)371{372 struct net_device *dev = dev_id;373 struct net_local *lp;374 int ioaddr, status;375 376 ioaddr = dev->base_addr;377 lp = netdev_priv(dev);378 379 /* we MUST read all the events out of the ISQ, otherwise we'll never380 get interrupted again. As a consequence, we can't have any limit381 on the number of times we loop in the interrupt handler. The382 hardware guarantees that eventually we'll run out of events. Of383 course, if you're on a slow machine, and packets are arriving384 faster than you can read them off, you're screwed. Hasta la385 vista, baby! */386 while ((status = swab16(nubus_readw(dev->base_addr + ISQ_PORT)))) {387 netif_dbg(lp, intr, dev, "status=%04x\n", status);388 switch(status & ISQ_EVENT_MASK) {389 case ISQ_RECEIVER_EVENT:390 /* Got a packet(s). */391 net_rx(dev);392 break;393 case ISQ_TRANSMITTER_EVENT:394 dev->stats.tx_packets++;395 netif_wake_queue(dev);396 if ((status & TX_OK) == 0)397 dev->stats.tx_errors++;398 if (status & TX_LOST_CRS)399 dev->stats.tx_carrier_errors++;400 if (status & TX_SQE_ERROR)401 dev->stats.tx_heartbeat_errors++;402 if (status & TX_LATE_COL)403 dev->stats.tx_window_errors++;404 if (status & TX_16_COL)405 dev->stats.tx_aborted_errors++;406 break;407 case ISQ_BUFFER_EVENT:408 if (status & READY_FOR_TX) {409 /* we tried to transmit a packet earlier,410 but inexplicably ran out of buffers.411 That shouldn't happen since we only ever412 load one packet. Shrug. Do the right413 thing anyway. */414 netif_wake_queue(dev);415 }416 if (status & TX_UNDERRUN) {417 netif_dbg(lp, tx_err, dev, "transmit underrun\n");418 lp->send_underrun++;419 if (lp->send_underrun == 3) lp->send_cmd = TX_AFTER_381;420 else if (lp->send_underrun == 6) lp->send_cmd = TX_AFTER_ALL;421 }422 break;423 case ISQ_RX_MISS_EVENT:424 dev->stats.rx_missed_errors += (status >> 6);425 break;426 case ISQ_TX_COL_EVENT:427 dev->stats.collisions += (status >> 6);428 break;429 }430 }431 return IRQ_HANDLED;432}433 434/* We have a good packet(s), get it/them out of the buffers. */435static void436net_rx(struct net_device *dev)437{438 struct net_local *lp = netdev_priv(dev);439 struct sk_buff *skb;440 int status, length;441 442 status = readreg(dev, PP_RxStatus);443 if ((status & RX_OK) == 0) {444 dev->stats.rx_errors++;445 if (status & RX_RUNT)446 dev->stats.rx_length_errors++;447 if (status & RX_EXTRA_DATA)448 dev->stats.rx_length_errors++;449 if ((status & RX_CRC_ERROR) &&450 !(status & (RX_EXTRA_DATA|RX_RUNT)))451 /* per str 172 */452 dev->stats.rx_crc_errors++;453 if (status & RX_DRIBBLE)454 dev->stats.rx_frame_errors++;455 return;456 }457 458 length = readreg(dev, PP_RxLength);459 /* Malloc up new buffer. */460 skb = alloc_skb(length, GFP_ATOMIC);461 if (skb == NULL) {462 dev->stats.rx_dropped++;463 return;464 }465 skb_put(skb, length);466 467 skb_copy_to_linear_data(skb, (void *)(dev->mem_start + PP_RxFrame),468 length);469 470 netif_dbg(lp, rx_status, dev, "received %d byte packet of type %x\n",471 length, skb->data[ETH_ALEN + ETH_ALEN] << 8 |472 skb->data[ETH_ALEN + ETH_ALEN + 1]);473 474 skb->protocol=eth_type_trans(skb,dev);475 netif_rx(skb);476 dev->stats.rx_packets++;477 dev->stats.rx_bytes += length;478}479 480/* The inverse routine to net_open(). */481static int482net_close(struct net_device *dev)483{484 485 writereg(dev, PP_RxCFG, 0);486 writereg(dev, PP_TxCFG, 0);487 writereg(dev, PP_BufCFG, 0);488 writereg(dev, PP_BusCTL, 0);489 490 netif_stop_queue(dev);491 492 free_irq(dev->irq, dev);493 494 /* Update the statistics here. */495 496 return 0;497 498}499 500/* Get the current statistics. This may be called with the card open or501 closed. */502static struct net_device_stats *503net_get_stats(struct net_device *dev)504{505 unsigned long flags;506 507 local_irq_save(flags);508 /* Update the statistics from the device registers. */509 dev->stats.rx_missed_errors += (readreg(dev, PP_RxMiss) >> 6);510 dev->stats.collisions += (readreg(dev, PP_TxCol) >> 6);511 local_irq_restore(flags);512 513 return &dev->stats;514}515 516static void set_multicast_list(struct net_device *dev)517{518 struct net_local *lp = netdev_priv(dev);519 520 if(dev->flags&IFF_PROMISC)521 {522 lp->rx_mode = RX_ALL_ACCEPT;523 } else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev)) {524 /* The multicast-accept list is initialized to accept-all, and we525 rely on higher-level filtering for now. */526 lp->rx_mode = RX_MULTCAST_ACCEPT;527 }528 else529 lp->rx_mode = 0;530 531 writereg(dev, PP_RxCTL, DEF_RX_ACCEPT | lp->rx_mode);532 533 /* in promiscuous mode, we accept errored packets, so we have to enable interrupts on them also */534 writereg(dev, PP_RxCFG, lp->curr_rx_cfg |535 (lp->rx_mode == RX_ALL_ACCEPT? (RX_CRC_ERROR_ENBL|RX_RUNT_ENBL|RX_EXTRA_DATA_ENBL) : 0));536}537 538 539static int set_mac_address(struct net_device *dev, void *addr)540{541 struct sockaddr *saddr = addr;542 int i;543 544 if (!is_valid_ether_addr(saddr->sa_data))545 return -EADDRNOTAVAIL;546 547 eth_hw_addr_set(dev, saddr->sa_data);548 netdev_info(dev, "Setting MAC address to %pM\n", dev->dev_addr);549 550 /* set the Ethernet address */551 for (i=0; i < ETH_ALEN/2; i++)552 writereg(dev, PP_IA+i*2, dev->dev_addr[i*2] | (dev->dev_addr[i*2+1] << 8));553 554 return 0;555}556 557MODULE_DESCRIPTION("Macintosh CS89x0-based Ethernet driver");558MODULE_LICENSE("GPL");559 560static void mac89x0_device_remove(struct platform_device *pdev)561{562 struct net_device *dev = platform_get_drvdata(pdev);563 564 unregister_netdev(dev);565 nubus_writew(0, dev->base_addr + ADD_PORT);566 free_netdev(dev);567}568 569static struct platform_driver mac89x0_platform_driver = {570 .probe = mac89x0_device_probe,571 .remove_new = mac89x0_device_remove,572 .driver = {573 .name = "mac89x0",574 },575};576 577module_platform_driver(mac89x0_platform_driver);578