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Annotation of Gnu-Mach/linux/src/drivers/net/ne2k-pci.c, revision 1.1

1.1     ! root        1: /* ne2k-pci.c: A NE2000 clone on PCI bus driver for Linux. */
        !             2: /*
        !             3:        A Linux device driver for PCI NE2000 clones.
        !             4: 
        !             5:        Authorship and other copyrights:
        !             6:        1992-1998 by Donald Becker, NE2000 core and various modifications.
        !             7:        1995-1998 by Paul Gortmaker, core modifications and PCI support.
        !             8: 
        !             9:        Copyright 1993 assigned to the United States Government as represented
        !            10:        by the Director, National Security Agency.
        !            11: 
        !            12:        This software may be used and distributed according to the terms
        !            13:        of the GNU Public License, incorporated herein by reference.
        !            14: 
        !            15:        The author may be reached as [email protected], or C/O
        !            16:        Center of Excellence in Space Data and Information Sciences
        !            17:        Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
        !            18: 
        !            19:        People are making PCI ne2000 clones! Oh the horror, the horror...
        !            20: 
        !            21:        Issues remaining:
        !            22:        No full-duplex support.
        !            23: */
        !            24: 
        !            25: /* Our copyright info must remain in the binary. */
        !            26: static const char *version =
        !            27: "ne2k-pci.c:v0.99L 2/7/98 D. Becker/P. Gortmaker http://cesdis.gsfc.nasa.gov/linux/drivers/ne2k-pci.html\n";
        !            28: 
        !            29: #ifdef MODVERSIONS
        !            30: #include <linux/modversions.h>
        !            31: #endif
        !            32: #include <linux/module.h>
        !            33: #include <linux/kernel.h>
        !            34: #include <linux/sched.h>
        !            35: #include <linux/errno.h>
        !            36: #include <linux/pci.h>
        !            37: #include <linux/bios32.h>
        !            38: #include <asm/system.h>
        !            39: #include <asm/io.h>
        !            40: #include <asm/irq.h>
        !            41: 
        !            42: #include <linux/netdevice.h>
        !            43: #include <linux/etherdevice.h>
        !            44: #include "8390.h"
        !            45: 
        !            46: /* Set statically or when loading the driver module. */
        !            47: static int debug = 1;
        !            48: 
        !            49: /* Some defines that people can play with if so inclined. */
        !            50: 
        !            51: /* Do #define LOAD_8390_BY_KERNELD to automatically load 8390 support. */
        !            52: #ifdef LOAD_8390_BY_KERNELD
        !            53: #include <linux/kerneld.h>
        !            54: #endif
        !            55: /* Use 32 bit data-movement operations instead of 16 bit. */
        !            56: #define USE_LONGIO
        !            57: 
        !            58: /* Do we implement the read before write bugfix ? */
        !            59: /* #define NE_RW_BUGFIX */
        !            60: 
        !            61: /* Do we have a non std. amount of memory? (in units of 256 byte pages) */
        !            62: /* #define PACKETBUF_MEMSIZE   0x40 */
        !            63: 
        !            64: static struct {
        !            65:        unsigned short vendor, dev_id;
        !            66:        char *name;
        !            67: }
        !            68: pci_clone_list[] = {
        !            69:        {0x10ec, 0x8029, "RealTek RTL-8029"},
        !            70:        {0x1050, 0x0940, "Winbond 89C940"},
        !            71:        {0x11f6, 0x1401, "Compex RL2000"},
        !            72:        {0x8e2e, 0x3000, "KTI ET32P2"},
        !            73:        {0x4a14, 0x5000, "NetVin NV5000SC"},
        !            74:        {0x1106, 0x0926, "Via 82C926"},
        !            75:        {0,}
        !            76: };
        !            77: 
        !            78: /* ---- No user-serviceable parts below ---- */
        !            79: 
        !            80: #define NE_BASE         (dev->base_addr)
        !            81: #define NE_CMD         0x00
        !            82: #define NE_DATAPORT    0x10    /* NatSemi-defined port window offset. */
        !            83: #define NE_RESET       0x1f    /* Issue a read to reset, a write to clear. */
        !            84: #define NE_IO_EXTENT   0x20
        !            85: 
        !            86: #define NESM_START_PG  0x40    /* First page of TX buffer */
        !            87: #define NESM_STOP_PG   0x80    /* Last page +1 of RX ring */
        !            88: 
        !            89: int ne2k_pci_probe(struct device *dev);
        !            90: static struct device *ne2k_pci_probe1(struct device *dev, int ioaddr, int irq);
        !            91: 
        !            92: static int ne_open(struct device *dev);
        !            93: static int ne_close(struct device *dev);
        !            94: 
        !            95: static void ne_reset_8390(struct device *dev);
        !            96: static void ne_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr,
        !            97:                          int ring_page);
        !            98: static void ne_block_input(struct device *dev, int count,
        !            99:                          struct sk_buff *skb, int ring_offset);
        !           100: static void ne_block_output(struct device *dev, const int count,
        !           101:                const unsigned char *buf, const int start_page);
        !           102: 
        !           103: 
        !           104: 
        !           105: /* No room in the standard 8390 structure for extra info we need. */
        !           106: struct ne2k_pci_card {
        !           107:        struct ne2k_pci_card *next;
        !           108:        struct device *dev;
        !           109:        unsigned char pci_bus, pci_device_fn;
        !           110: };
        !           111: /* A list of all installed devices, for removing the driver module. */
        !           112: static struct ne2k_pci_card *ne2k_card_list = NULL;
        !           113: 
        !           114: #ifdef LOAD_8390_BY_KERNELD
        !           115: static int (*Lethdev_init)(struct device *dev);
        !           116: static void (*LNS8390_init)(struct device *dev, int startp);
        !           117: static int (*Lei_open)(struct device *dev);
        !           118: static int (*Lei_close)(struct device *dev);
        !           119: static void (*Lei_interrupt)(int irq, void *dev_id, struct pt_regs *regs);
        !           120: #else
        !           121: #define Lethdev_init ethdev_init
        !           122: #define LNS8390_init NS8390_init
        !           123: #define Lei_open ei_open
        !           124: #define Lei_close ei_close
        !           125: #define Lei_interrupt ei_interrupt
        !           126: #endif
        !           127: 
        !           128: #ifdef MODULE
        !           129: 
        !           130: int
        !           131: init_module(void)
        !           132: {
        !           133:        /* We must emit version information. */
        !           134:        if (debug)
        !           135:                printk(KERN_INFO "%s", version);
        !           136: 
        !           137:        return ne2k_pci_probe(0);
        !           138: }
        !           139: 
        !           140: void
        !           141: cleanup_module(void)
        !           142: {
        !           143:        struct device *dev;
        !           144:        struct ne2k_pci_card *this_card;
        !           145: 
        !           146:        /* No need to check MOD_IN_USE, as sys_delete_module() checks. */
        !           147:        while (ne2k_card_list) {
        !           148:                dev = ne2k_card_list->dev;
        !           149:                unregister_netdev(dev);
        !           150:                release_region(dev->base_addr, NE_IO_EXTENT);
        !           151:                kfree(dev);
        !           152:                this_card = ne2k_card_list;
        !           153:                ne2k_card_list = ne2k_card_list->next;
        !           154:                kfree(this_card);
        !           155:        }
        !           156: 
        !           157: #ifdef LOAD_8390_BY_KERNELD
        !           158:        release_module("8390", 0);
        !           159: #endif
        !           160: }
        !           161: 
        !           162: #endif  /* MODULE */
        !           163: 
        !           164: /*
        !           165:   NEx000-clone boards have a Station Address (SA) PROM (SAPROM) in the packet
        !           166:   buffer memory space.  By-the-spec NE2000 clones have 0x57,0x57 in bytes
        !           167:   0x0e,0x0f of the SAPROM, while other supposed NE2000 clones must be
        !           168:   detected by their SA prefix.
        !           169: 
        !           170:   Reading the SAPROM from a word-wide card with the 8390 set in byte-wide
        !           171:   mode results in doubled values, which can be detected and compensated for.
        !           172: 
        !           173:   The probe is also responsible for initializing the card and filling
        !           174:   in the 'dev' and 'ei_status' structures.
        !           175: */
        !           176: 
        !           177: #ifdef HAVE_DEVLIST
        !           178: struct netdev_entry netcard_drv =
        !           179: {"ne2k_pci", ne2k_pci_probe1, NE_IO_EXTENT, 0};
        !           180: #endif
        !           181: 
        !           182: int ne2k_pci_probe(struct device *dev)
        !           183: {
        !           184:        static int pci_index = 0;       /* Static, for multiple calls. */
        !           185:        int cards_found = 0;
        !           186:        int i;
        !           187: 
        !           188:        if ( ! pcibios_present())
        !           189:                return -ENODEV;
        !           190: 
        !           191:        for (;pci_index < 0xff; pci_index++) {
        !           192:                unsigned char pci_bus, pci_device_fn;
        !           193:                u8 pci_irq_line;
        !           194:                u16 pci_command, new_command, vendor, device;
        !           195:                u32 pci_ioaddr;
        !           196: 
        !           197:                if (pcibios_find_class (PCI_CLASS_NETWORK_ETHERNET << 8, pci_index,
        !           198:                                                                &pci_bus, &pci_device_fn)
        !           199:                        != PCIBIOS_SUCCESSFUL)
        !           200:                        break;
        !           201:                pcibios_read_config_word(pci_bus, pci_device_fn,
        !           202:                                                                 PCI_VENDOR_ID, &vendor);
        !           203:                pcibios_read_config_word(pci_bus, pci_device_fn,
        !           204:                                                                 PCI_DEVICE_ID, &device);
        !           205: 
        !           206:                /* Note: some vendor IDs (RealTek) have non-NE2k cards as well. */
        !           207:                for (i = 0; pci_clone_list[i].vendor != 0; i++)
        !           208:                        if (pci_clone_list[i].vendor == vendor
        !           209:                                && pci_clone_list[i].dev_id == device)
        !           210:                                break;
        !           211:                if (pci_clone_list[i].vendor == 0)
        !           212:                        continue;
        !           213: 
        !           214: #ifndef MODULE
        !           215:                {
        !           216:                        static unsigned version_printed = 0;
        !           217:                        if (version_printed++ == 0)
        !           218:                                printk(KERN_INFO "%s", version);
        !           219:                }
        !           220: #endif
        !           221: 
        !           222:                pcibios_read_config_dword(pci_bus, pci_device_fn,
        !           223:                                                                  PCI_BASE_ADDRESS_0, &pci_ioaddr);
        !           224:                pcibios_read_config_byte(pci_bus, pci_device_fn,
        !           225:                                                                 PCI_INTERRUPT_LINE, &pci_irq_line);
        !           226:                pcibios_read_config_word(pci_bus, pci_device_fn,
        !           227:                                                                 PCI_COMMAND, &pci_command);
        !           228: 
        !           229:                /* Remove I/O space marker in bit 0. */
        !           230:                pci_ioaddr &= PCI_BASE_ADDRESS_IO_MASK;
        !           231: 
        !           232:                /* Avoid already found cards from previous calls */
        !           233:                if (check_region(pci_ioaddr, NE_IO_EXTENT))
        !           234:                        continue;
        !           235: 
        !           236:                /* Activate the card: fix for brain-damaged Win98 BIOSes. */
        !           237:                new_command = pci_command | PCI_COMMAND_IO;
        !           238:                if (pci_command != new_command) {
        !           239:                        printk(KERN_INFO "  The PCI BIOS has not enabled this"
        !           240:                                   " NE2k clone!  Updating PCI command %4.4x->%4.4x.\n",
        !           241:                                   pci_command, new_command);
        !           242:                        pcibios_write_config_word(pci_bus, pci_device_fn,
        !           243:                                                                          PCI_COMMAND, new_command);
        !           244:                }
        !           245: 
        !           246:                if (pci_irq_line <= 0 || pci_irq_line >= NR_IRQS)
        !           247:                        printk(KERN_WARNING " WARNING: The PCI BIOS assigned this PCI NE2k"
        !           248:                                   " card to IRQ %d, which is unlikely to work!.\n"
        !           249:                                   KERN_WARNING " You should use the PCI BIOS setup to assign"
        !           250:                                   " a valid IRQ line.\n", pci_irq_line);
        !           251: 
        !           252:                printk("ne2k-pci.c: PCI NE2000 clone '%s' at I/O %#x, IRQ %d.\n",
        !           253:                           pci_clone_list[i].name, pci_ioaddr, pci_irq_line);
        !           254:                dev = ne2k_pci_probe1(dev, pci_ioaddr, pci_irq_line);
        !           255:                if (dev == 0) {
        !           256:                        /* Should not happen. */
        !           257:                        printk(KERN_ERR "ne2k-pci: Probe of PCI card at %#x failed.\n",
        !           258:                                   pci_ioaddr);
        !           259:                        continue;
        !           260:                } else {
        !           261:                        struct ne2k_pci_card *ne2k_card =
        !           262:                                kmalloc(sizeof(struct ne2k_pci_card), GFP_KERNEL);
        !           263:                        ne2k_card->next = ne2k_card_list;
        !           264:                        ne2k_card_list = ne2k_card;
        !           265:                        ne2k_card->dev = dev;
        !           266:                        ne2k_card->pci_bus = pci_bus;
        !           267:                        ne2k_card->pci_device_fn = pci_device_fn;
        !           268:                }
        !           269:                dev = 0;
        !           270: 
        !           271:                cards_found++;
        !           272:        }
        !           273: 
        !           274:        return cards_found ? 0 : -ENODEV;
        !           275: }
        !           276: 
        !           277: static struct device *ne2k_pci_probe1(struct device *dev, int ioaddr, int irq)
        !           278: {
        !           279:        int i;
        !           280:        unsigned char SA_prom[32];
        !           281:        const char *name = NULL;
        !           282:        int start_page, stop_page;
        !           283:        int reg0 = inb(ioaddr);
        !           284: 
        !           285:        if (reg0 == 0xFF)
        !           286:                return 0;
        !           287: 
        !           288:        /* Do a preliminary verification that we have a 8390. */
        !           289:        {
        !           290:                int regd;
        !           291:                outb(E8390_NODMA+E8390_PAGE1+E8390_STOP, ioaddr + E8390_CMD);
        !           292:                regd = inb(ioaddr + 0x0d);
        !           293:                outb(0xff, ioaddr + 0x0d);
        !           294:                outb(E8390_NODMA+E8390_PAGE0, ioaddr + E8390_CMD);
        !           295:                inb(ioaddr + EN0_COUNTER0); /* Clear the counter by reading. */
        !           296:                if (inb(ioaddr + EN0_COUNTER0) != 0) {
        !           297:                        outb(reg0, ioaddr);
        !           298:                        outb(regd, ioaddr + 0x0d);      /* Restore the old values. */
        !           299:                        return 0;
        !           300:                }
        !           301:        }
        !           302: 
        !           303:        dev = init_etherdev(dev, 0);
        !           304: 
        !           305:        /* Reset card. Who knows what dain-bramaged state it was left in. */
        !           306:        {
        !           307:                unsigned long reset_start_time = jiffies;
        !           308: 
        !           309:                outb(inb(ioaddr + NE_RESET), ioaddr + NE_RESET);
        !           310: 
        !           311:                /* This looks like a horrible timing loop, but it should never take
        !           312:                   more than a few cycles.
        !           313:                */
        !           314:                while ((inb(ioaddr + EN0_ISR) & ENISR_RESET) == 0)
        !           315:                        /* Limit wait: '2' avoids jiffy roll-over. */
        !           316:                        if (jiffies - reset_start_time > 2) {
        !           317:                                printk("ne2k-pci: Card failure (no reset ack).\n");
        !           318:                                return 0;
        !           319:                        }
        !           320:                
        !           321:                outb(0xff, ioaddr + EN0_ISR);           /* Ack all intr. */
        !           322:        }
        !           323: 
        !           324: #if defined(LOAD_8390_BY_KERNELD)
        !           325:        /* We are now certain the 8390 module is required. */
        !           326:        if (request_module("8390")) {
        !           327:                printk("ne2k-pci: Failed to load the 8390 core module.\n");
        !           328:                return 0;
        !           329:        }
        !           330:        if ((Lethdev_init = (void*)get_module_symbol(0, "ethdev_init")) == 0 ||
        !           331:                (LNS8390_init = (void*)get_module_symbol(0, "NS8390_init")) == 0 ||
        !           332:                (Lei_open = (void*)get_module_symbol(0, "ei_open")) == 0 ||
        !           333:                (Lei_close = (void*)get_module_symbol(0, "ei_close")) == 0 ||
        !           334:                (Lei_interrupt = (void*)get_module_symbol(0, "ei_interrupt")) == 0 ) {
        !           335:                printk("ne2k-pci: Failed to resolve an 8390 symbol.\n");
        !           336:                release_module("8390", 0);
        !           337:                return 0;
        !           338:        }
        !           339: #endif
        !           340: 
        !           341:        /* Read the 16 bytes of station address PROM.
        !           342:           We must first initialize registers, similar to NS8390_init(eifdev, 0).
        !           343:           We can't reliably read the SAPROM address without this.
        !           344:           (I learned the hard way!). */
        !           345:        {
        !           346:                struct {unsigned char value, offset; } program_seq[] = {
        !           347:                        {E8390_NODMA+E8390_PAGE0+E8390_STOP, E8390_CMD}, /* Select page 0*/
        !           348:                        {0x49,  EN0_DCFG},      /* Set word-wide access. */
        !           349:                        {0x00,  EN0_RCNTLO},    /* Clear the count regs. */
        !           350:                        {0x00,  EN0_RCNTHI},
        !           351:                        {0x00,  EN0_IMR},       /* Mask completion irq. */
        !           352:                        {0xFF,  EN0_ISR},
        !           353:                        {E8390_RXOFF, EN0_RXCR},        /* 0x20  Set to monitor */
        !           354:                        {E8390_TXOFF, EN0_TXCR},        /* 0x02  and loopback mode. */
        !           355:                        {32,    EN0_RCNTLO},
        !           356:                        {0x00,  EN0_RCNTHI},
        !           357:                        {0x00,  EN0_RSARLO},    /* DMA starting at 0x0000. */
        !           358:                        {0x00,  EN0_RSARHI},
        !           359:                        {E8390_RREAD+E8390_START, E8390_CMD},
        !           360:                };
        !           361:                for (i = 0; i < sizeof(program_seq)/sizeof(program_seq[0]); i++)
        !           362:                        outb(program_seq[i].value, ioaddr + program_seq[i].offset);
        !           363: 
        !           364:        }
        !           365: 
        !           366: #ifdef notdef
        !           367:        /* Some broken PCI cards don't respect the byte-wide
        !           368:           request in program_seq above, and hence don't have doubled up values.
        !           369:        */
        !           370:        for(i = 0; i < 32 /*sizeof(SA_prom)*/; i+=2) {
        !           371:                SA_prom[i] = inb(ioaddr + NE_DATAPORT);
        !           372:                SA_prom[i+1] = inb(ioaddr + NE_DATAPORT);
        !           373:                if (SA_prom[i] != SA_prom[i+1])
        !           374:                        sa_prom_doubled = 0;
        !           375:        }
        !           376: 
        !           377:        if (sa_prom_doubled)
        !           378:                for (i = 0; i < 16; i++)
        !           379:                        SA_prom[i] = SA_prom[i+i];
        !           380: #else
        !           381:        for(i = 0; i < 32 /*sizeof(SA_prom)*/; i++)
        !           382:                SA_prom[i] = inb(ioaddr + NE_DATAPORT);
        !           383: 
        !           384: #endif
        !           385: 
        !           386:        /* We always set the 8390 registers for word mode. */
        !           387:        outb(0x49, ioaddr + EN0_DCFG);
        !           388:        start_page = NESM_START_PG;
        !           389:        stop_page = NESM_STOP_PG;
        !           390: 
        !           391:        /* Set up the rest of the parameters. */
        !           392:        name = "PCI NE2000";
        !           393: 
        !           394:        dev->irq = irq;
        !           395:        dev->base_addr = ioaddr;
        !           396: 
        !           397:        /* Allocate dev->priv and fill in 8390 specific dev fields. */
        !           398:        if (Lethdev_init(dev)) {
        !           399:                printk ("%s: unable to get memory for dev->priv.\n", dev->name);
        !           400:                return 0;
        !           401:        }
        !           402: 
        !           403:        request_region(ioaddr, NE_IO_EXTENT, dev->name);
        !           404: 
        !           405:        printk("%s: %s found at %#x, IRQ %d, ",
        !           406:                   dev->name, name, ioaddr, dev->irq);
        !           407:        for(i = 0; i < 6; i++) {
        !           408:                printk("%2.2X%s", SA_prom[i], i == 5 ? ".\n": ":");
        !           409:                dev->dev_addr[i] = SA_prom[i];
        !           410:        }
        !           411: 
        !           412:        ei_status.name = name;
        !           413:        ei_status.tx_start_page = start_page;
        !           414:        ei_status.stop_page = stop_page;
        !           415:        ei_status.word16 = 1;
        !           416: 
        !           417:        ei_status.rx_start_page = start_page + TX_PAGES;
        !           418: #ifdef PACKETBUF_MEMSIZE
        !           419:        /* Allow the packet buffer size to be overridden by know-it-alls. */
        !           420:        ei_status.stop_page = ei_status.tx_start_page + PACKETBUF_MEMSIZE;
        !           421: #endif
        !           422: 
        !           423:        ei_status.reset_8390 = &ne_reset_8390;
        !           424:        ei_status.block_input = &ne_block_input;
        !           425:        ei_status.block_output = &ne_block_output;
        !           426:        ei_status.get_8390_hdr = &ne_get_8390_hdr;
        !           427:        dev->open = &ne_open;
        !           428:        dev->stop = &ne_close;
        !           429:        LNS8390_init(dev, 0);
        !           430:        return dev;
        !           431: }
        !           432: 
        !           433: static int
        !           434: ne_open(struct device *dev)
        !           435: {
        !           436:        if (request_irq(dev->irq, Lei_interrupt, SA_SHIRQ, dev->name, dev))
        !           437:                return -EAGAIN;
        !           438:        Lei_open(dev);
        !           439:        MOD_INC_USE_COUNT;
        !           440:        return 0;
        !           441: }
        !           442: 
        !           443: static int
        !           444: ne_close(struct device *dev)
        !           445: {
        !           446:        Lei_close(dev);
        !           447:        free_irq(dev->irq, dev);
        !           448:        MOD_DEC_USE_COUNT;
        !           449:        return 0;
        !           450: }
        !           451: 
        !           452: /* Hard reset the card.  This used to pause for the same period that a
        !           453:    8390 reset command required, but that shouldn't be necessary. */
        !           454: static void
        !           455: ne_reset_8390(struct device *dev)
        !           456: {
        !           457:        unsigned long reset_start_time = jiffies;
        !           458: 
        !           459:        if (debug > 1) printk("%s: Resetting the 8390 t=%ld...",
        !           460:                                                  dev->name, jiffies);
        !           461: 
        !           462:        outb(inb(NE_BASE + NE_RESET), NE_BASE + NE_RESET);
        !           463: 
        !           464:        ei_status.txing = 0;
        !           465:        ei_status.dmaing = 0;
        !           466: 
        !           467:        /* This check _should_not_ be necessary, omit eventually. */
        !           468:        while ((inb(NE_BASE+EN0_ISR) & ENISR_RESET) == 0)
        !           469:                if (jiffies - reset_start_time > 2) {
        !           470:                        printk("%s: ne_reset_8390() did not complete.\n", dev->name);
        !           471:                        break;
        !           472:                }
        !           473:        outb(ENISR_RESET, NE_BASE + EN0_ISR);   /* Ack intr. */
        !           474: }
        !           475: 
        !           476: /* Grab the 8390 specific header. Similar to the block_input routine, but
        !           477:    we don't need to be concerned with ring wrap as the header will be at
        !           478:    the start of a page, so we optimize accordingly. */
        !           479: 
        !           480: static void
        !           481: ne_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
        !           482: {
        !           483: 
        !           484:        int nic_base = dev->base_addr;
        !           485: 
        !           486:        /* This *shouldn't* happen. If it does, it's the last thing you'll see */
        !           487:        if (ei_status.dmaing) {
        !           488:                printk("%s: DMAing conflict in ne_get_8390_hdr "
        !           489:                           "[DMAstat:%d][irqlock:%d][intr:%d].\n",
        !           490:                           dev->name, ei_status.dmaing, ei_status.irqlock,
        !           491:                           dev->interrupt);
        !           492:                return;
        !           493:        }
        !           494: 
        !           495:        ei_status.dmaing |= 0x01;
        !           496:        outb(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base+ NE_CMD);
        !           497:        outb(sizeof(struct e8390_pkt_hdr), nic_base + EN0_RCNTLO);
        !           498:        outb(0, nic_base + EN0_RCNTHI);
        !           499:        outb(0, nic_base + EN0_RSARLO);         /* On page boundary */
        !           500:        outb(ring_page, nic_base + EN0_RSARHI);
        !           501:        outb(E8390_RREAD+E8390_START, nic_base + NE_CMD);
        !           502: 
        !           503: #if defined(USE_LONGIO)
        !           504:        *(u32*)hdr = inl(NE_BASE + NE_DATAPORT);
        !           505: #else
        !           506:        insw(NE_BASE + NE_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1);
        !           507: #endif
        !           508: 
        !           509:        outb(ENISR_RDC, nic_base + EN0_ISR);    /* Ack intr. */
        !           510:        ei_status.dmaing &= ~0x01;
        !           511: }
        !           512: 
        !           513: /* Block input and output, similar to the Crynwr packet driver.  If you
        !           514:    are porting to a new ethercard, look at the packet driver source for hints.
        !           515:    The NEx000 doesn't share the on-board packet memory -- you have to put
        !           516:    the packet out through the "remote DMA" dataport using outb. */
        !           517: 
        !           518: static void
        !           519: ne_block_input(struct device *dev, int count, struct sk_buff *skb, int ring_offset)
        !           520: {
        !           521:        int nic_base = dev->base_addr;
        !           522:        char *buf = skb->data;
        !           523: 
        !           524:        /* This *shouldn't* happen. If it does, it's the last thing you'll see */
        !           525:        if (ei_status.dmaing) {
        !           526:                printk("%s: DMAing conflict in ne_block_input "
        !           527:                           "[DMAstat:%d][irqlock:%d][intr:%d].\n",
        !           528:                           dev->name, ei_status.dmaing, ei_status.irqlock,
        !           529:                           dev->interrupt);
        !           530:                return;
        !           531:        }
        !           532:        ei_status.dmaing |= 0x01;
        !           533:        outb(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base+ NE_CMD);
        !           534:        outb(count & 0xff, nic_base + EN0_RCNTLO);
        !           535:        outb(count >> 8, nic_base + EN0_RCNTHI);
        !           536:        outb(ring_offset & 0xff, nic_base + EN0_RSARLO);
        !           537:        outb(ring_offset >> 8, nic_base + EN0_RSARHI);
        !           538:        outb(E8390_RREAD+E8390_START, nic_base + NE_CMD);
        !           539: 
        !           540: #if defined(USE_LONGIO)
        !           541:        insl(NE_BASE + NE_DATAPORT, buf, count>>2);
        !           542:        if (count & 3) {
        !           543:                buf += count & ~3;
        !           544:                if (count & 2)
        !           545:                        *((u16*)buf)++ = inw(NE_BASE + NE_DATAPORT);
        !           546:                if (count & 1)
        !           547:                        *buf = inb(NE_BASE + NE_DATAPORT);
        !           548:        }
        !           549: #else
        !           550:        insw(NE_BASE + NE_DATAPORT,buf,count>>1);
        !           551:        if (count & 0x01) {
        !           552:                buf[count-1] = inb(NE_BASE + NE_DATAPORT);
        !           553:        }
        !           554: #endif
        !           555: 
        !           556:        outb(ENISR_RDC, nic_base + EN0_ISR);    /* Ack intr. */
        !           557:        ei_status.dmaing &= ~0x01;
        !           558: }
        !           559: 
        !           560: static void
        !           561: ne_block_output(struct device *dev, int count,
        !           562:                const unsigned char *buf, const int start_page)
        !           563: {
        !           564:        int nic_base = NE_BASE;
        !           565:        unsigned long dma_start;
        !           566: 
        !           567:        /* On little-endian it's always safe to round the count up for
        !           568:           word writes. */
        !           569:        if (count & 0x01)
        !           570:                count++;
        !           571: 
        !           572:        /* This *shouldn't* happen. If it does, it's the last thing you'll see */
        !           573:        if (ei_status.dmaing) {
        !           574:                printk("%s: DMAing conflict in ne_block_output."
        !           575:                           "[DMAstat:%d][irqlock:%d][intr:%d]\n",
        !           576:                           dev->name, ei_status.dmaing, ei_status.irqlock,
        !           577:                           dev->interrupt);
        !           578:                return;
        !           579:        }
        !           580:        ei_status.dmaing |= 0x01;
        !           581:        /* We should already be in page 0, but to be safe... */
        !           582:        outb(E8390_PAGE0+E8390_START+E8390_NODMA, nic_base + NE_CMD);
        !           583: 
        !           584: #ifdef NE8390_RW_BUGFIX
        !           585:        /* Handle the read-before-write bug the same way as the
        !           586:           Crynwr packet driver -- the NatSemi method doesn't work.
        !           587:           Actually this doesn't always work either, but if you have
        !           588:           problems with your NEx000 this is better than nothing! */
        !           589:        outb(0x42, nic_base + EN0_RCNTLO);
        !           590:        outb(0x00, nic_base + EN0_RCNTHI);
        !           591:        outb(0x42, nic_base + EN0_RSARLO);
        !           592:        outb(0x00, nic_base + EN0_RSARHI);
        !           593:        outb(E8390_RREAD+E8390_START, nic_base + NE_CMD);
        !           594: #endif
        !           595:        outb(ENISR_RDC, nic_base + EN0_ISR);
        !           596: 
        !           597:    /* Now the normal output. */
        !           598:        outb(count & 0xff, nic_base + EN0_RCNTLO);
        !           599:        outb(count >> 8,   nic_base + EN0_RCNTHI);
        !           600:        outb(0x00, nic_base + EN0_RSARLO);
        !           601:        outb(start_page, nic_base + EN0_RSARHI);
        !           602:        outb(E8390_RWRITE+E8390_START, nic_base + NE_CMD);
        !           603: #if defined(USE_LONGIO)
        !           604:        outsl(NE_BASE + NE_DATAPORT, buf, count>>2);
        !           605:        if (count & 3) {
        !           606:                buf += count & ~3;
        !           607:                if (count & 2)
        !           608:                        outw(*((u16*)buf)++, NE_BASE + NE_DATAPORT);
        !           609:        }
        !           610: #else
        !           611:        outsw(NE_BASE + NE_DATAPORT, buf, count>>1);
        !           612: #endif
        !           613: 
        !           614:        dma_start = jiffies;
        !           615: 
        !           616:        while ((inb(nic_base + EN0_ISR) & ENISR_RDC) == 0)
        !           617:                if (jiffies - dma_start > 2) {                  /* Avoid clock roll-over. */
        !           618:                        printk("%s: timeout waiting for Tx RDC.\n", dev->name);
        !           619:                        ne_reset_8390(dev);
        !           620:                        LNS8390_init(dev,1);
        !           621:                        break;
        !           622:                }
        !           623: 
        !           624:        outb(ENISR_RDC, nic_base + EN0_ISR);    /* Ack intr. */
        !           625:        ei_status.dmaing &= ~0x01;
        !           626:        return;
        !           627: }
        !           628: 
        !           629: 
        !           630: /*
        !           631:  * Local variables:
        !           632:  *  compile-command: "gcc -DMODVERSIONS  -DMODULE -D__KERNEL__ -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer -I/usr/src/linux/drivers/net/ -c ne2k-pci.c"
        !           633:  *  alt-compile-command: "gcc -DMODULE -D__KERNEL__ -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer -I/usr/src/linux/drivers/net/ -c ne2k-pci.c"
        !           634:  *  c-indent-level: 4
        !           635:  *  c-basic-offset: 4
        !           636:  *  tab-width: 4
        !           637:  *  version-control: t
        !           638:  *  kept-new-versions: 5
        !           639:  * End:
        !           640:  */

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